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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
8f18cf13 | 19 | #include <linux/kernel.h> |
065631f6 | 20 | #include <linux/bio.h> |
39279cc3 | 21 | #include <linux/buffer_head.h> |
f2eb0a24 | 22 | #include <linux/file.h> |
39279cc3 CM |
23 | #include <linux/fs.h> |
24 | #include <linux/pagemap.h> | |
25 | #include <linux/highmem.h> | |
26 | #include <linux/time.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/string.h> | |
39279cc3 CM |
29 | #include <linux/backing-dev.h> |
30 | #include <linux/mpage.h> | |
31 | #include <linux/swap.h> | |
32 | #include <linux/writeback.h> | |
33 | #include <linux/statfs.h> | |
34 | #include <linux/compat.h> | |
9ebefb18 | 35 | #include <linux/bit_spinlock.h> |
5103e947 | 36 | #include <linux/xattr.h> |
33268eaf | 37 | #include <linux/posix_acl.h> |
d899e052 | 38 | #include <linux/falloc.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
7a36ddec | 40 | #include <linux/ratelimit.h> |
22c44fe6 | 41 | #include <linux/mount.h> |
4b4e25f2 | 42 | #include "compat.h" |
39279cc3 CM |
43 | #include "ctree.h" |
44 | #include "disk-io.h" | |
45 | #include "transaction.h" | |
46 | #include "btrfs_inode.h" | |
47 | #include "ioctl.h" | |
48 | #include "print-tree.h" | |
e6dcd2dc | 49 | #include "ordered-data.h" |
95819c05 | 50 | #include "xattr.h" |
e02119d5 | 51 | #include "tree-log.h" |
4a54c8c1 | 52 | #include "volumes.h" |
c8b97818 | 53 | #include "compression.h" |
b4ce94de | 54 | #include "locking.h" |
dc89e982 | 55 | #include "free-space-cache.h" |
581bb050 | 56 | #include "inode-map.h" |
39279cc3 CM |
57 | |
58 | struct btrfs_iget_args { | |
59 | u64 ino; | |
60 | struct btrfs_root *root; | |
61 | }; | |
62 | ||
6e1d5dcc AD |
63 | static const struct inode_operations btrfs_dir_inode_operations; |
64 | static const struct inode_operations btrfs_symlink_inode_operations; | |
65 | static const struct inode_operations btrfs_dir_ro_inode_operations; | |
66 | static const struct inode_operations btrfs_special_inode_operations; | |
67 | static const struct inode_operations btrfs_file_inode_operations; | |
7f09410b AD |
68 | static const struct address_space_operations btrfs_aops; |
69 | static const struct address_space_operations btrfs_symlink_aops; | |
828c0950 | 70 | static const struct file_operations btrfs_dir_file_operations; |
d1310b2e | 71 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
72 | |
73 | static struct kmem_cache *btrfs_inode_cachep; | |
74 | struct kmem_cache *btrfs_trans_handle_cachep; | |
75 | struct kmem_cache *btrfs_transaction_cachep; | |
39279cc3 | 76 | struct kmem_cache *btrfs_path_cachep; |
dc89e982 | 77 | struct kmem_cache *btrfs_free_space_cachep; |
39279cc3 CM |
78 | |
79 | #define S_SHIFT 12 | |
80 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
81 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
82 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
83 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
84 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
85 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
86 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
87 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
88 | }; | |
89 | ||
a41ad394 JB |
90 | static int btrfs_setsize(struct inode *inode, loff_t newsize); |
91 | static int btrfs_truncate(struct inode *inode); | |
c8b97818 | 92 | static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end); |
771ed689 CM |
93 | static noinline int cow_file_range(struct inode *inode, |
94 | struct page *locked_page, | |
95 | u64 start, u64 end, int *page_started, | |
96 | unsigned long *nr_written, int unlock); | |
2115133f CM |
97 | static noinline int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, |
98 | struct btrfs_root *root, struct inode *inode); | |
7b128766 | 99 | |
f34f57a3 | 100 | static int btrfs_init_inode_security(struct btrfs_trans_handle *trans, |
2a7dba39 EP |
101 | struct inode *inode, struct inode *dir, |
102 | const struct qstr *qstr) | |
0279b4cd JO |
103 | { |
104 | int err; | |
105 | ||
f34f57a3 | 106 | err = btrfs_init_acl(trans, inode, dir); |
0279b4cd | 107 | if (!err) |
2a7dba39 | 108 | err = btrfs_xattr_security_init(trans, inode, dir, qstr); |
0279b4cd JO |
109 | return err; |
110 | } | |
111 | ||
c8b97818 CM |
112 | /* |
113 | * this does all the hard work for inserting an inline extent into | |
114 | * the btree. The caller should have done a btrfs_drop_extents so that | |
115 | * no overlapping inline items exist in the btree | |
116 | */ | |
d397712b | 117 | static noinline int insert_inline_extent(struct btrfs_trans_handle *trans, |
c8b97818 CM |
118 | struct btrfs_root *root, struct inode *inode, |
119 | u64 start, size_t size, size_t compressed_size, | |
fe3f566c | 120 | int compress_type, |
c8b97818 CM |
121 | struct page **compressed_pages) |
122 | { | |
123 | struct btrfs_key key; | |
124 | struct btrfs_path *path; | |
125 | struct extent_buffer *leaf; | |
126 | struct page *page = NULL; | |
127 | char *kaddr; | |
128 | unsigned long ptr; | |
129 | struct btrfs_file_extent_item *ei; | |
130 | int err = 0; | |
131 | int ret; | |
132 | size_t cur_size = size; | |
133 | size_t datasize; | |
134 | unsigned long offset; | |
c8b97818 | 135 | |
fe3f566c | 136 | if (compressed_size && compressed_pages) |
c8b97818 | 137 | cur_size = compressed_size; |
c8b97818 | 138 | |
d397712b CM |
139 | path = btrfs_alloc_path(); |
140 | if (!path) | |
c8b97818 CM |
141 | return -ENOMEM; |
142 | ||
b9473439 | 143 | path->leave_spinning = 1; |
c8b97818 | 144 | |
33345d01 | 145 | key.objectid = btrfs_ino(inode); |
c8b97818 CM |
146 | key.offset = start; |
147 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
c8b97818 CM |
148 | datasize = btrfs_file_extent_calc_inline_size(cur_size); |
149 | ||
150 | inode_add_bytes(inode, size); | |
151 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
152 | datasize); | |
153 | BUG_ON(ret); | |
154 | if (ret) { | |
155 | err = ret; | |
c8b97818 CM |
156 | goto fail; |
157 | } | |
158 | leaf = path->nodes[0]; | |
159 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
160 | struct btrfs_file_extent_item); | |
161 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
162 | btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE); | |
163 | btrfs_set_file_extent_encryption(leaf, ei, 0); | |
164 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); | |
165 | btrfs_set_file_extent_ram_bytes(leaf, ei, size); | |
166 | ptr = btrfs_file_extent_inline_start(ei); | |
167 | ||
261507a0 | 168 | if (compress_type != BTRFS_COMPRESS_NONE) { |
c8b97818 CM |
169 | struct page *cpage; |
170 | int i = 0; | |
d397712b | 171 | while (compressed_size > 0) { |
c8b97818 | 172 | cpage = compressed_pages[i]; |
5b050f04 | 173 | cur_size = min_t(unsigned long, compressed_size, |
c8b97818 CM |
174 | PAGE_CACHE_SIZE); |
175 | ||
b9473439 | 176 | kaddr = kmap_atomic(cpage, KM_USER0); |
c8b97818 | 177 | write_extent_buffer(leaf, kaddr, ptr, cur_size); |
b9473439 | 178 | kunmap_atomic(kaddr, KM_USER0); |
c8b97818 CM |
179 | |
180 | i++; | |
181 | ptr += cur_size; | |
182 | compressed_size -= cur_size; | |
183 | } | |
184 | btrfs_set_file_extent_compression(leaf, ei, | |
261507a0 | 185 | compress_type); |
c8b97818 CM |
186 | } else { |
187 | page = find_get_page(inode->i_mapping, | |
188 | start >> PAGE_CACHE_SHIFT); | |
189 | btrfs_set_file_extent_compression(leaf, ei, 0); | |
190 | kaddr = kmap_atomic(page, KM_USER0); | |
191 | offset = start & (PAGE_CACHE_SIZE - 1); | |
192 | write_extent_buffer(leaf, kaddr + offset, ptr, size); | |
193 | kunmap_atomic(kaddr, KM_USER0); | |
194 | page_cache_release(page); | |
195 | } | |
196 | btrfs_mark_buffer_dirty(leaf); | |
197 | btrfs_free_path(path); | |
198 | ||
c2167754 YZ |
199 | /* |
200 | * we're an inline extent, so nobody can | |
201 | * extend the file past i_size without locking | |
202 | * a page we already have locked. | |
203 | * | |
204 | * We must do any isize and inode updates | |
205 | * before we unlock the pages. Otherwise we | |
206 | * could end up racing with unlink. | |
207 | */ | |
c8b97818 CM |
208 | BTRFS_I(inode)->disk_i_size = inode->i_size; |
209 | btrfs_update_inode(trans, root, inode); | |
c2167754 | 210 | |
c8b97818 CM |
211 | return 0; |
212 | fail: | |
213 | btrfs_free_path(path); | |
214 | return err; | |
215 | } | |
216 | ||
217 | ||
218 | /* | |
219 | * conditionally insert an inline extent into the file. This | |
220 | * does the checks required to make sure the data is small enough | |
221 | * to fit as an inline extent. | |
222 | */ | |
7f366cfe | 223 | static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans, |
c8b97818 CM |
224 | struct btrfs_root *root, |
225 | struct inode *inode, u64 start, u64 end, | |
fe3f566c | 226 | size_t compressed_size, int compress_type, |
c8b97818 CM |
227 | struct page **compressed_pages) |
228 | { | |
229 | u64 isize = i_size_read(inode); | |
230 | u64 actual_end = min(end + 1, isize); | |
231 | u64 inline_len = actual_end - start; | |
232 | u64 aligned_end = (end + root->sectorsize - 1) & | |
233 | ~((u64)root->sectorsize - 1); | |
234 | u64 hint_byte; | |
235 | u64 data_len = inline_len; | |
236 | int ret; | |
237 | ||
238 | if (compressed_size) | |
239 | data_len = compressed_size; | |
240 | ||
241 | if (start > 0 || | |
70b99e69 | 242 | actual_end >= PAGE_CACHE_SIZE || |
c8b97818 CM |
243 | data_len >= BTRFS_MAX_INLINE_DATA_SIZE(root) || |
244 | (!compressed_size && | |
245 | (actual_end & (root->sectorsize - 1)) == 0) || | |
246 | end + 1 < isize || | |
247 | data_len > root->fs_info->max_inline) { | |
248 | return 1; | |
249 | } | |
250 | ||
920bbbfb | 251 | ret = btrfs_drop_extents(trans, inode, start, aligned_end, |
a1ed835e | 252 | &hint_byte, 1); |
c8b97818 CM |
253 | BUG_ON(ret); |
254 | ||
255 | if (isize > actual_end) | |
256 | inline_len = min_t(u64, isize, actual_end); | |
257 | ret = insert_inline_extent(trans, root, inode, start, | |
258 | inline_len, compressed_size, | |
fe3f566c | 259 | compress_type, compressed_pages); |
c8b97818 | 260 | BUG_ON(ret); |
0ca1f7ce | 261 | btrfs_delalloc_release_metadata(inode, end + 1 - start); |
a1ed835e | 262 | btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0); |
c8b97818 CM |
263 | return 0; |
264 | } | |
265 | ||
771ed689 CM |
266 | struct async_extent { |
267 | u64 start; | |
268 | u64 ram_size; | |
269 | u64 compressed_size; | |
270 | struct page **pages; | |
271 | unsigned long nr_pages; | |
261507a0 | 272 | int compress_type; |
771ed689 CM |
273 | struct list_head list; |
274 | }; | |
275 | ||
276 | struct async_cow { | |
277 | struct inode *inode; | |
278 | struct btrfs_root *root; | |
279 | struct page *locked_page; | |
280 | u64 start; | |
281 | u64 end; | |
282 | struct list_head extents; | |
283 | struct btrfs_work work; | |
284 | }; | |
285 | ||
286 | static noinline int add_async_extent(struct async_cow *cow, | |
287 | u64 start, u64 ram_size, | |
288 | u64 compressed_size, | |
289 | struct page **pages, | |
261507a0 LZ |
290 | unsigned long nr_pages, |
291 | int compress_type) | |
771ed689 CM |
292 | { |
293 | struct async_extent *async_extent; | |
294 | ||
295 | async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS); | |
dac97e51 | 296 | BUG_ON(!async_extent); |
771ed689 CM |
297 | async_extent->start = start; |
298 | async_extent->ram_size = ram_size; | |
299 | async_extent->compressed_size = compressed_size; | |
300 | async_extent->pages = pages; | |
301 | async_extent->nr_pages = nr_pages; | |
261507a0 | 302 | async_extent->compress_type = compress_type; |
771ed689 CM |
303 | list_add_tail(&async_extent->list, &cow->extents); |
304 | return 0; | |
305 | } | |
306 | ||
d352ac68 | 307 | /* |
771ed689 CM |
308 | * we create compressed extents in two phases. The first |
309 | * phase compresses a range of pages that have already been | |
310 | * locked (both pages and state bits are locked). | |
c8b97818 | 311 | * |
771ed689 CM |
312 | * This is done inside an ordered work queue, and the compression |
313 | * is spread across many cpus. The actual IO submission is step | |
314 | * two, and the ordered work queue takes care of making sure that | |
315 | * happens in the same order things were put onto the queue by | |
316 | * writepages and friends. | |
c8b97818 | 317 | * |
771ed689 CM |
318 | * If this code finds it can't get good compression, it puts an |
319 | * entry onto the work queue to write the uncompressed bytes. This | |
320 | * makes sure that both compressed inodes and uncompressed inodes | |
321 | * are written in the same order that pdflush sent them down. | |
d352ac68 | 322 | */ |
771ed689 CM |
323 | static noinline int compress_file_range(struct inode *inode, |
324 | struct page *locked_page, | |
325 | u64 start, u64 end, | |
326 | struct async_cow *async_cow, | |
327 | int *num_added) | |
b888db2b CM |
328 | { |
329 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
330 | struct btrfs_trans_handle *trans; | |
db94535d | 331 | u64 num_bytes; |
db94535d | 332 | u64 blocksize = root->sectorsize; |
c8b97818 | 333 | u64 actual_end; |
42dc7bab | 334 | u64 isize = i_size_read(inode); |
e6dcd2dc | 335 | int ret = 0; |
c8b97818 CM |
336 | struct page **pages = NULL; |
337 | unsigned long nr_pages; | |
338 | unsigned long nr_pages_ret = 0; | |
339 | unsigned long total_compressed = 0; | |
340 | unsigned long total_in = 0; | |
341 | unsigned long max_compressed = 128 * 1024; | |
771ed689 | 342 | unsigned long max_uncompressed = 128 * 1024; |
c8b97818 CM |
343 | int i; |
344 | int will_compress; | |
261507a0 | 345 | int compress_type = root->fs_info->compress_type; |
b888db2b | 346 | |
4cb5300b CM |
347 | /* if this is a small write inside eof, kick off a defragbot */ |
348 | if (end <= BTRFS_I(inode)->disk_i_size && (end - start + 1) < 16 * 1024) | |
349 | btrfs_add_inode_defrag(NULL, inode); | |
350 | ||
42dc7bab | 351 | actual_end = min_t(u64, isize, end + 1); |
c8b97818 CM |
352 | again: |
353 | will_compress = 0; | |
354 | nr_pages = (end >> PAGE_CACHE_SHIFT) - (start >> PAGE_CACHE_SHIFT) + 1; | |
355 | nr_pages = min(nr_pages, (128 * 1024UL) / PAGE_CACHE_SIZE); | |
be20aa9d | 356 | |
f03d9301 CM |
357 | /* |
358 | * we don't want to send crud past the end of i_size through | |
359 | * compression, that's just a waste of CPU time. So, if the | |
360 | * end of the file is before the start of our current | |
361 | * requested range of bytes, we bail out to the uncompressed | |
362 | * cleanup code that can deal with all of this. | |
363 | * | |
364 | * It isn't really the fastest way to fix things, but this is a | |
365 | * very uncommon corner. | |
366 | */ | |
367 | if (actual_end <= start) | |
368 | goto cleanup_and_bail_uncompressed; | |
369 | ||
c8b97818 CM |
370 | total_compressed = actual_end - start; |
371 | ||
372 | /* we want to make sure that amount of ram required to uncompress | |
373 | * an extent is reasonable, so we limit the total size in ram | |
771ed689 CM |
374 | * of a compressed extent to 128k. This is a crucial number |
375 | * because it also controls how easily we can spread reads across | |
376 | * cpus for decompression. | |
377 | * | |
378 | * We also want to make sure the amount of IO required to do | |
379 | * a random read is reasonably small, so we limit the size of | |
380 | * a compressed extent to 128k. | |
c8b97818 CM |
381 | */ |
382 | total_compressed = min(total_compressed, max_uncompressed); | |
db94535d | 383 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 384 | num_bytes = max(blocksize, num_bytes); |
c8b97818 CM |
385 | total_in = 0; |
386 | ret = 0; | |
db94535d | 387 | |
771ed689 CM |
388 | /* |
389 | * we do compression for mount -o compress and when the | |
390 | * inode has not been flagged as nocompress. This flag can | |
391 | * change at any time if we discover bad compression ratios. | |
c8b97818 | 392 | */ |
6cbff00f | 393 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) && |
1e701a32 | 394 | (btrfs_test_opt(root, COMPRESS) || |
75e7cb7f LB |
395 | (BTRFS_I(inode)->force_compress) || |
396 | (BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS))) { | |
c8b97818 | 397 | WARN_ON(pages); |
cfbc246e | 398 | pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS); |
560f7d75 LZ |
399 | if (!pages) { |
400 | /* just bail out to the uncompressed code */ | |
401 | goto cont; | |
402 | } | |
c8b97818 | 403 | |
261507a0 LZ |
404 | if (BTRFS_I(inode)->force_compress) |
405 | compress_type = BTRFS_I(inode)->force_compress; | |
406 | ||
407 | ret = btrfs_compress_pages(compress_type, | |
408 | inode->i_mapping, start, | |
409 | total_compressed, pages, | |
410 | nr_pages, &nr_pages_ret, | |
411 | &total_in, | |
412 | &total_compressed, | |
413 | max_compressed); | |
c8b97818 CM |
414 | |
415 | if (!ret) { | |
416 | unsigned long offset = total_compressed & | |
417 | (PAGE_CACHE_SIZE - 1); | |
418 | struct page *page = pages[nr_pages_ret - 1]; | |
419 | char *kaddr; | |
420 | ||
421 | /* zero the tail end of the last page, we might be | |
422 | * sending it down to disk | |
423 | */ | |
424 | if (offset) { | |
425 | kaddr = kmap_atomic(page, KM_USER0); | |
426 | memset(kaddr + offset, 0, | |
427 | PAGE_CACHE_SIZE - offset); | |
428 | kunmap_atomic(kaddr, KM_USER0); | |
429 | } | |
430 | will_compress = 1; | |
431 | } | |
432 | } | |
560f7d75 | 433 | cont: |
c8b97818 | 434 | if (start == 0) { |
7a7eaa40 | 435 | trans = btrfs_join_transaction(root); |
3612b495 | 436 | BUG_ON(IS_ERR(trans)); |
0ca1f7ce | 437 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
771ed689 | 438 | |
c8b97818 | 439 | /* lets try to make an inline extent */ |
771ed689 | 440 | if (ret || total_in < (actual_end - start)) { |
c8b97818 | 441 | /* we didn't compress the entire range, try |
771ed689 | 442 | * to make an uncompressed inline extent. |
c8b97818 CM |
443 | */ |
444 | ret = cow_file_range_inline(trans, root, inode, | |
fe3f566c | 445 | start, end, 0, 0, NULL); |
c8b97818 | 446 | } else { |
771ed689 | 447 | /* try making a compressed inline extent */ |
c8b97818 CM |
448 | ret = cow_file_range_inline(trans, root, inode, |
449 | start, end, | |
fe3f566c LZ |
450 | total_compressed, |
451 | compress_type, pages); | |
c8b97818 CM |
452 | } |
453 | if (ret == 0) { | |
771ed689 CM |
454 | /* |
455 | * inline extent creation worked, we don't need | |
456 | * to create any more async work items. Unlock | |
457 | * and free up our temp pages. | |
458 | */ | |
c8b97818 | 459 | extent_clear_unlock_delalloc(inode, |
a791e35e CM |
460 | &BTRFS_I(inode)->io_tree, |
461 | start, end, NULL, | |
462 | EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY | | |
a3429ab7 | 463 | EXTENT_CLEAR_DELALLOC | |
a791e35e | 464 | EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK); |
c2167754 YZ |
465 | |
466 | btrfs_end_transaction(trans, root); | |
c8b97818 CM |
467 | goto free_pages_out; |
468 | } | |
c2167754 | 469 | btrfs_end_transaction(trans, root); |
c8b97818 CM |
470 | } |
471 | ||
472 | if (will_compress) { | |
473 | /* | |
474 | * we aren't doing an inline extent round the compressed size | |
475 | * up to a block size boundary so the allocator does sane | |
476 | * things | |
477 | */ | |
478 | total_compressed = (total_compressed + blocksize - 1) & | |
479 | ~(blocksize - 1); | |
480 | ||
481 | /* | |
482 | * one last check to make sure the compression is really a | |
483 | * win, compare the page count read with the blocks on disk | |
484 | */ | |
485 | total_in = (total_in + PAGE_CACHE_SIZE - 1) & | |
486 | ~(PAGE_CACHE_SIZE - 1); | |
487 | if (total_compressed >= total_in) { | |
488 | will_compress = 0; | |
489 | } else { | |
c8b97818 CM |
490 | num_bytes = total_in; |
491 | } | |
492 | } | |
493 | if (!will_compress && pages) { | |
494 | /* | |
495 | * the compression code ran but failed to make things smaller, | |
496 | * free any pages it allocated and our page pointer array | |
497 | */ | |
498 | for (i = 0; i < nr_pages_ret; i++) { | |
70b99e69 | 499 | WARN_ON(pages[i]->mapping); |
c8b97818 CM |
500 | page_cache_release(pages[i]); |
501 | } | |
502 | kfree(pages); | |
503 | pages = NULL; | |
504 | total_compressed = 0; | |
505 | nr_pages_ret = 0; | |
506 | ||
507 | /* flag the file so we don't compress in the future */ | |
1e701a32 CM |
508 | if (!btrfs_test_opt(root, FORCE_COMPRESS) && |
509 | !(BTRFS_I(inode)->force_compress)) { | |
a555f810 | 510 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; |
1e701a32 | 511 | } |
c8b97818 | 512 | } |
771ed689 CM |
513 | if (will_compress) { |
514 | *num_added += 1; | |
c8b97818 | 515 | |
771ed689 CM |
516 | /* the async work queues will take care of doing actual |
517 | * allocation on disk for these compressed pages, | |
518 | * and will submit them to the elevator. | |
519 | */ | |
520 | add_async_extent(async_cow, start, num_bytes, | |
261507a0 LZ |
521 | total_compressed, pages, nr_pages_ret, |
522 | compress_type); | |
179e29e4 | 523 | |
24ae6365 | 524 | if (start + num_bytes < end) { |
771ed689 CM |
525 | start += num_bytes; |
526 | pages = NULL; | |
527 | cond_resched(); | |
528 | goto again; | |
529 | } | |
530 | } else { | |
f03d9301 | 531 | cleanup_and_bail_uncompressed: |
771ed689 CM |
532 | /* |
533 | * No compression, but we still need to write the pages in | |
534 | * the file we've been given so far. redirty the locked | |
535 | * page if it corresponds to our extent and set things up | |
536 | * for the async work queue to run cow_file_range to do | |
537 | * the normal delalloc dance | |
538 | */ | |
539 | if (page_offset(locked_page) >= start && | |
540 | page_offset(locked_page) <= end) { | |
541 | __set_page_dirty_nobuffers(locked_page); | |
542 | /* unlocked later on in the async handlers */ | |
543 | } | |
261507a0 LZ |
544 | add_async_extent(async_cow, start, end - start + 1, |
545 | 0, NULL, 0, BTRFS_COMPRESS_NONE); | |
771ed689 CM |
546 | *num_added += 1; |
547 | } | |
3b951516 | 548 | |
771ed689 CM |
549 | out: |
550 | return 0; | |
551 | ||
552 | free_pages_out: | |
553 | for (i = 0; i < nr_pages_ret; i++) { | |
554 | WARN_ON(pages[i]->mapping); | |
555 | page_cache_release(pages[i]); | |
556 | } | |
d397712b | 557 | kfree(pages); |
771ed689 CM |
558 | |
559 | goto out; | |
560 | } | |
561 | ||
562 | /* | |
563 | * phase two of compressed writeback. This is the ordered portion | |
564 | * of the code, which only gets called in the order the work was | |
565 | * queued. We walk all the async extents created by compress_file_range | |
566 | * and send them down to the disk. | |
567 | */ | |
568 | static noinline int submit_compressed_extents(struct inode *inode, | |
569 | struct async_cow *async_cow) | |
570 | { | |
571 | struct async_extent *async_extent; | |
572 | u64 alloc_hint = 0; | |
573 | struct btrfs_trans_handle *trans; | |
574 | struct btrfs_key ins; | |
575 | struct extent_map *em; | |
576 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
577 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
578 | struct extent_io_tree *io_tree; | |
f5a84ee3 | 579 | int ret = 0; |
771ed689 CM |
580 | |
581 | if (list_empty(&async_cow->extents)) | |
582 | return 0; | |
583 | ||
771ed689 | 584 | |
d397712b | 585 | while (!list_empty(&async_cow->extents)) { |
771ed689 CM |
586 | async_extent = list_entry(async_cow->extents.next, |
587 | struct async_extent, list); | |
588 | list_del(&async_extent->list); | |
c8b97818 | 589 | |
771ed689 CM |
590 | io_tree = &BTRFS_I(inode)->io_tree; |
591 | ||
f5a84ee3 | 592 | retry: |
771ed689 CM |
593 | /* did the compression code fall back to uncompressed IO? */ |
594 | if (!async_extent->pages) { | |
595 | int page_started = 0; | |
596 | unsigned long nr_written = 0; | |
597 | ||
598 | lock_extent(io_tree, async_extent->start, | |
2ac55d41 JB |
599 | async_extent->start + |
600 | async_extent->ram_size - 1, GFP_NOFS); | |
771ed689 CM |
601 | |
602 | /* allocate blocks */ | |
f5a84ee3 JB |
603 | ret = cow_file_range(inode, async_cow->locked_page, |
604 | async_extent->start, | |
605 | async_extent->start + | |
606 | async_extent->ram_size - 1, | |
607 | &page_started, &nr_written, 0); | |
771ed689 CM |
608 | |
609 | /* | |
610 | * if page_started, cow_file_range inserted an | |
611 | * inline extent and took care of all the unlocking | |
612 | * and IO for us. Otherwise, we need to submit | |
613 | * all those pages down to the drive. | |
614 | */ | |
f5a84ee3 | 615 | if (!page_started && !ret) |
771ed689 CM |
616 | extent_write_locked_range(io_tree, |
617 | inode, async_extent->start, | |
d397712b | 618 | async_extent->start + |
771ed689 CM |
619 | async_extent->ram_size - 1, |
620 | btrfs_get_extent, | |
621 | WB_SYNC_ALL); | |
622 | kfree(async_extent); | |
623 | cond_resched(); | |
624 | continue; | |
625 | } | |
626 | ||
627 | lock_extent(io_tree, async_extent->start, | |
628 | async_extent->start + async_extent->ram_size - 1, | |
629 | GFP_NOFS); | |
771ed689 | 630 | |
7a7eaa40 | 631 | trans = btrfs_join_transaction(root); |
3612b495 | 632 | BUG_ON(IS_ERR(trans)); |
74b21075 | 633 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
771ed689 CM |
634 | ret = btrfs_reserve_extent(trans, root, |
635 | async_extent->compressed_size, | |
636 | async_extent->compressed_size, | |
637 | 0, alloc_hint, | |
638 | (u64)-1, &ins, 1); | |
c2167754 YZ |
639 | btrfs_end_transaction(trans, root); |
640 | ||
f5a84ee3 JB |
641 | if (ret) { |
642 | int i; | |
643 | for (i = 0; i < async_extent->nr_pages; i++) { | |
644 | WARN_ON(async_extent->pages[i]->mapping); | |
645 | page_cache_release(async_extent->pages[i]); | |
646 | } | |
647 | kfree(async_extent->pages); | |
648 | async_extent->nr_pages = 0; | |
649 | async_extent->pages = NULL; | |
650 | unlock_extent(io_tree, async_extent->start, | |
651 | async_extent->start + | |
652 | async_extent->ram_size - 1, GFP_NOFS); | |
653 | goto retry; | |
654 | } | |
655 | ||
c2167754 YZ |
656 | /* |
657 | * here we're doing allocation and writeback of the | |
658 | * compressed pages | |
659 | */ | |
660 | btrfs_drop_extent_cache(inode, async_extent->start, | |
661 | async_extent->start + | |
662 | async_extent->ram_size - 1, 0); | |
663 | ||
172ddd60 | 664 | em = alloc_extent_map(); |
c26a9203 | 665 | BUG_ON(!em); |
771ed689 CM |
666 | em->start = async_extent->start; |
667 | em->len = async_extent->ram_size; | |
445a6944 | 668 | em->orig_start = em->start; |
c8b97818 | 669 | |
771ed689 CM |
670 | em->block_start = ins.objectid; |
671 | em->block_len = ins.offset; | |
672 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
261507a0 | 673 | em->compress_type = async_extent->compress_type; |
771ed689 CM |
674 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
675 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); | |
676 | ||
d397712b | 677 | while (1) { |
890871be | 678 | write_lock(&em_tree->lock); |
771ed689 | 679 | ret = add_extent_mapping(em_tree, em); |
890871be | 680 | write_unlock(&em_tree->lock); |
771ed689 CM |
681 | if (ret != -EEXIST) { |
682 | free_extent_map(em); | |
683 | break; | |
684 | } | |
685 | btrfs_drop_extent_cache(inode, async_extent->start, | |
686 | async_extent->start + | |
687 | async_extent->ram_size - 1, 0); | |
688 | } | |
689 | ||
261507a0 LZ |
690 | ret = btrfs_add_ordered_extent_compress(inode, |
691 | async_extent->start, | |
692 | ins.objectid, | |
693 | async_extent->ram_size, | |
694 | ins.offset, | |
695 | BTRFS_ORDERED_COMPRESSED, | |
696 | async_extent->compress_type); | |
771ed689 CM |
697 | BUG_ON(ret); |
698 | ||
771ed689 CM |
699 | /* |
700 | * clear dirty, set writeback and unlock the pages. | |
701 | */ | |
702 | extent_clear_unlock_delalloc(inode, | |
a791e35e CM |
703 | &BTRFS_I(inode)->io_tree, |
704 | async_extent->start, | |
705 | async_extent->start + | |
706 | async_extent->ram_size - 1, | |
707 | NULL, EXTENT_CLEAR_UNLOCK_PAGE | | |
708 | EXTENT_CLEAR_UNLOCK | | |
a3429ab7 | 709 | EXTENT_CLEAR_DELALLOC | |
a791e35e | 710 | EXTENT_CLEAR_DIRTY | EXTENT_SET_WRITEBACK); |
771ed689 CM |
711 | |
712 | ret = btrfs_submit_compressed_write(inode, | |
d397712b CM |
713 | async_extent->start, |
714 | async_extent->ram_size, | |
715 | ins.objectid, | |
716 | ins.offset, async_extent->pages, | |
717 | async_extent->nr_pages); | |
771ed689 CM |
718 | |
719 | BUG_ON(ret); | |
771ed689 CM |
720 | alloc_hint = ins.objectid + ins.offset; |
721 | kfree(async_extent); | |
722 | cond_resched(); | |
723 | } | |
724 | ||
771ed689 CM |
725 | return 0; |
726 | } | |
727 | ||
4b46fce2 JB |
728 | static u64 get_extent_allocation_hint(struct inode *inode, u64 start, |
729 | u64 num_bytes) | |
730 | { | |
731 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
732 | struct extent_map *em; | |
733 | u64 alloc_hint = 0; | |
734 | ||
735 | read_lock(&em_tree->lock); | |
736 | em = search_extent_mapping(em_tree, start, num_bytes); | |
737 | if (em) { | |
738 | /* | |
739 | * if block start isn't an actual block number then find the | |
740 | * first block in this inode and use that as a hint. If that | |
741 | * block is also bogus then just don't worry about it. | |
742 | */ | |
743 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { | |
744 | free_extent_map(em); | |
745 | em = search_extent_mapping(em_tree, 0, 0); | |
746 | if (em && em->block_start < EXTENT_MAP_LAST_BYTE) | |
747 | alloc_hint = em->block_start; | |
748 | if (em) | |
749 | free_extent_map(em); | |
750 | } else { | |
751 | alloc_hint = em->block_start; | |
752 | free_extent_map(em); | |
753 | } | |
754 | } | |
755 | read_unlock(&em_tree->lock); | |
756 | ||
757 | return alloc_hint; | |
758 | } | |
759 | ||
771ed689 CM |
760 | /* |
761 | * when extent_io.c finds a delayed allocation range in the file, | |
762 | * the call backs end up in this code. The basic idea is to | |
763 | * allocate extents on disk for the range, and create ordered data structs | |
764 | * in ram to track those extents. | |
765 | * | |
766 | * locked_page is the page that writepage had locked already. We use | |
767 | * it to make sure we don't do extra locks or unlocks. | |
768 | * | |
769 | * *page_started is set to one if we unlock locked_page and do everything | |
770 | * required to start IO on it. It may be clean and already done with | |
771 | * IO when we return. | |
772 | */ | |
773 | static noinline int cow_file_range(struct inode *inode, | |
774 | struct page *locked_page, | |
775 | u64 start, u64 end, int *page_started, | |
776 | unsigned long *nr_written, | |
777 | int unlock) | |
778 | { | |
779 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
780 | struct btrfs_trans_handle *trans; | |
781 | u64 alloc_hint = 0; | |
782 | u64 num_bytes; | |
783 | unsigned long ram_size; | |
784 | u64 disk_num_bytes; | |
785 | u64 cur_alloc_size; | |
786 | u64 blocksize = root->sectorsize; | |
771ed689 CM |
787 | struct btrfs_key ins; |
788 | struct extent_map *em; | |
789 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
790 | int ret = 0; | |
791 | ||
2cf8572d | 792 | BUG_ON(btrfs_is_free_space_inode(root, inode)); |
7a7eaa40 | 793 | trans = btrfs_join_transaction(root); |
3612b495 | 794 | BUG_ON(IS_ERR(trans)); |
0ca1f7ce | 795 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
771ed689 | 796 | |
771ed689 CM |
797 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
798 | num_bytes = max(blocksize, num_bytes); | |
799 | disk_num_bytes = num_bytes; | |
800 | ret = 0; | |
801 | ||
4cb5300b CM |
802 | /* if this is a small write inside eof, kick off defrag */ |
803 | if (end <= BTRFS_I(inode)->disk_i_size && num_bytes < 64 * 1024) | |
804 | btrfs_add_inode_defrag(trans, inode); | |
805 | ||
771ed689 CM |
806 | if (start == 0) { |
807 | /* lets try to make an inline extent */ | |
808 | ret = cow_file_range_inline(trans, root, inode, | |
fe3f566c | 809 | start, end, 0, 0, NULL); |
771ed689 CM |
810 | if (ret == 0) { |
811 | extent_clear_unlock_delalloc(inode, | |
a791e35e CM |
812 | &BTRFS_I(inode)->io_tree, |
813 | start, end, NULL, | |
814 | EXTENT_CLEAR_UNLOCK_PAGE | | |
815 | EXTENT_CLEAR_UNLOCK | | |
816 | EXTENT_CLEAR_DELALLOC | | |
817 | EXTENT_CLEAR_DIRTY | | |
818 | EXTENT_SET_WRITEBACK | | |
819 | EXTENT_END_WRITEBACK); | |
c2167754 | 820 | |
771ed689 CM |
821 | *nr_written = *nr_written + |
822 | (end - start + PAGE_CACHE_SIZE) / PAGE_CACHE_SIZE; | |
823 | *page_started = 1; | |
824 | ret = 0; | |
825 | goto out; | |
826 | } | |
827 | } | |
828 | ||
829 | BUG_ON(disk_num_bytes > | |
6c41761f | 830 | btrfs_super_total_bytes(root->fs_info->super_copy)); |
771ed689 | 831 | |
4b46fce2 | 832 | alloc_hint = get_extent_allocation_hint(inode, start, num_bytes); |
771ed689 CM |
833 | btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0); |
834 | ||
d397712b | 835 | while (disk_num_bytes > 0) { |
a791e35e CM |
836 | unsigned long op; |
837 | ||
287a0ab9 | 838 | cur_alloc_size = disk_num_bytes; |
e6dcd2dc | 839 | ret = btrfs_reserve_extent(trans, root, cur_alloc_size, |
771ed689 | 840 | root->sectorsize, 0, alloc_hint, |
e6dcd2dc | 841 | (u64)-1, &ins, 1); |
d397712b CM |
842 | BUG_ON(ret); |
843 | ||
172ddd60 | 844 | em = alloc_extent_map(); |
c26a9203 | 845 | BUG_ON(!em); |
e6dcd2dc | 846 | em->start = start; |
445a6944 | 847 | em->orig_start = em->start; |
771ed689 CM |
848 | ram_size = ins.offset; |
849 | em->len = ins.offset; | |
c8b97818 | 850 | |
e6dcd2dc | 851 | em->block_start = ins.objectid; |
c8b97818 | 852 | em->block_len = ins.offset; |
e6dcd2dc | 853 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
7f3c74fb | 854 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
c8b97818 | 855 | |
d397712b | 856 | while (1) { |
890871be | 857 | write_lock(&em_tree->lock); |
e6dcd2dc | 858 | ret = add_extent_mapping(em_tree, em); |
890871be | 859 | write_unlock(&em_tree->lock); |
e6dcd2dc CM |
860 | if (ret != -EEXIST) { |
861 | free_extent_map(em); | |
862 | break; | |
863 | } | |
864 | btrfs_drop_extent_cache(inode, start, | |
c8b97818 | 865 | start + ram_size - 1, 0); |
e6dcd2dc CM |
866 | } |
867 | ||
98d20f67 | 868 | cur_alloc_size = ins.offset; |
e6dcd2dc | 869 | ret = btrfs_add_ordered_extent(inode, start, ins.objectid, |
771ed689 | 870 | ram_size, cur_alloc_size, 0); |
e6dcd2dc | 871 | BUG_ON(ret); |
c8b97818 | 872 | |
17d217fe YZ |
873 | if (root->root_key.objectid == |
874 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
875 | ret = btrfs_reloc_clone_csums(inode, start, | |
876 | cur_alloc_size); | |
877 | BUG_ON(ret); | |
878 | } | |
879 | ||
d397712b | 880 | if (disk_num_bytes < cur_alloc_size) |
3b951516 | 881 | break; |
d397712b | 882 | |
c8b97818 CM |
883 | /* we're not doing compressed IO, don't unlock the first |
884 | * page (which the caller expects to stay locked), don't | |
885 | * clear any dirty bits and don't set any writeback bits | |
8b62b72b CM |
886 | * |
887 | * Do set the Private2 bit so we know this page was properly | |
888 | * setup for writepage | |
c8b97818 | 889 | */ |
a791e35e CM |
890 | op = unlock ? EXTENT_CLEAR_UNLOCK_PAGE : 0; |
891 | op |= EXTENT_CLEAR_UNLOCK | EXTENT_CLEAR_DELALLOC | | |
892 | EXTENT_SET_PRIVATE2; | |
893 | ||
c8b97818 CM |
894 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, |
895 | start, start + ram_size - 1, | |
a791e35e | 896 | locked_page, op); |
c8b97818 | 897 | disk_num_bytes -= cur_alloc_size; |
c59f8951 CM |
898 | num_bytes -= cur_alloc_size; |
899 | alloc_hint = ins.objectid + ins.offset; | |
900 | start += cur_alloc_size; | |
b888db2b | 901 | } |
b888db2b | 902 | out: |
771ed689 | 903 | ret = 0; |
b888db2b | 904 | btrfs_end_transaction(trans, root); |
c8b97818 | 905 | |
be20aa9d | 906 | return ret; |
771ed689 | 907 | } |
c8b97818 | 908 | |
771ed689 CM |
909 | /* |
910 | * work queue call back to started compression on a file and pages | |
911 | */ | |
912 | static noinline void async_cow_start(struct btrfs_work *work) | |
913 | { | |
914 | struct async_cow *async_cow; | |
915 | int num_added = 0; | |
916 | async_cow = container_of(work, struct async_cow, work); | |
917 | ||
918 | compress_file_range(async_cow->inode, async_cow->locked_page, | |
919 | async_cow->start, async_cow->end, async_cow, | |
920 | &num_added); | |
921 | if (num_added == 0) | |
922 | async_cow->inode = NULL; | |
923 | } | |
924 | ||
925 | /* | |
926 | * work queue call back to submit previously compressed pages | |
927 | */ | |
928 | static noinline void async_cow_submit(struct btrfs_work *work) | |
929 | { | |
930 | struct async_cow *async_cow; | |
931 | struct btrfs_root *root; | |
932 | unsigned long nr_pages; | |
933 | ||
934 | async_cow = container_of(work, struct async_cow, work); | |
935 | ||
936 | root = async_cow->root; | |
937 | nr_pages = (async_cow->end - async_cow->start + PAGE_CACHE_SIZE) >> | |
938 | PAGE_CACHE_SHIFT; | |
939 | ||
940 | atomic_sub(nr_pages, &root->fs_info->async_delalloc_pages); | |
941 | ||
942 | if (atomic_read(&root->fs_info->async_delalloc_pages) < | |
943 | 5 * 1042 * 1024 && | |
944 | waitqueue_active(&root->fs_info->async_submit_wait)) | |
945 | wake_up(&root->fs_info->async_submit_wait); | |
946 | ||
d397712b | 947 | if (async_cow->inode) |
771ed689 | 948 | submit_compressed_extents(async_cow->inode, async_cow); |
771ed689 | 949 | } |
c8b97818 | 950 | |
771ed689 CM |
951 | static noinline void async_cow_free(struct btrfs_work *work) |
952 | { | |
953 | struct async_cow *async_cow; | |
954 | async_cow = container_of(work, struct async_cow, work); | |
955 | kfree(async_cow); | |
956 | } | |
957 | ||
958 | static int cow_file_range_async(struct inode *inode, struct page *locked_page, | |
959 | u64 start, u64 end, int *page_started, | |
960 | unsigned long *nr_written) | |
961 | { | |
962 | struct async_cow *async_cow; | |
963 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
964 | unsigned long nr_pages; | |
965 | u64 cur_end; | |
966 | int limit = 10 * 1024 * 1042; | |
967 | ||
a3429ab7 CM |
968 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED, |
969 | 1, 0, NULL, GFP_NOFS); | |
d397712b | 970 | while (start < end) { |
771ed689 | 971 | async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS); |
8d413713 | 972 | BUG_ON(!async_cow); |
771ed689 CM |
973 | async_cow->inode = inode; |
974 | async_cow->root = root; | |
975 | async_cow->locked_page = locked_page; | |
976 | async_cow->start = start; | |
977 | ||
6cbff00f | 978 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) |
771ed689 CM |
979 | cur_end = end; |
980 | else | |
981 | cur_end = min(end, start + 512 * 1024 - 1); | |
982 | ||
983 | async_cow->end = cur_end; | |
984 | INIT_LIST_HEAD(&async_cow->extents); | |
985 | ||
986 | async_cow->work.func = async_cow_start; | |
987 | async_cow->work.ordered_func = async_cow_submit; | |
988 | async_cow->work.ordered_free = async_cow_free; | |
989 | async_cow->work.flags = 0; | |
990 | ||
771ed689 CM |
991 | nr_pages = (cur_end - start + PAGE_CACHE_SIZE) >> |
992 | PAGE_CACHE_SHIFT; | |
993 | atomic_add(nr_pages, &root->fs_info->async_delalloc_pages); | |
994 | ||
995 | btrfs_queue_worker(&root->fs_info->delalloc_workers, | |
996 | &async_cow->work); | |
997 | ||
998 | if (atomic_read(&root->fs_info->async_delalloc_pages) > limit) { | |
999 | wait_event(root->fs_info->async_submit_wait, | |
1000 | (atomic_read(&root->fs_info->async_delalloc_pages) < | |
1001 | limit)); | |
1002 | } | |
1003 | ||
d397712b | 1004 | while (atomic_read(&root->fs_info->async_submit_draining) && |
771ed689 CM |
1005 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
1006 | wait_event(root->fs_info->async_submit_wait, | |
1007 | (atomic_read(&root->fs_info->async_delalloc_pages) == | |
1008 | 0)); | |
1009 | } | |
1010 | ||
1011 | *nr_written += nr_pages; | |
1012 | start = cur_end + 1; | |
1013 | } | |
1014 | *page_started = 1; | |
1015 | return 0; | |
be20aa9d CM |
1016 | } |
1017 | ||
d397712b | 1018 | static noinline int csum_exist_in_range(struct btrfs_root *root, |
17d217fe YZ |
1019 | u64 bytenr, u64 num_bytes) |
1020 | { | |
1021 | int ret; | |
1022 | struct btrfs_ordered_sum *sums; | |
1023 | LIST_HEAD(list); | |
1024 | ||
07d400a6 | 1025 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, bytenr, |
a2de733c | 1026 | bytenr + num_bytes - 1, &list, 0); |
17d217fe YZ |
1027 | if (ret == 0 && list_empty(&list)) |
1028 | return 0; | |
1029 | ||
1030 | while (!list_empty(&list)) { | |
1031 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); | |
1032 | list_del(&sums->list); | |
1033 | kfree(sums); | |
1034 | } | |
1035 | return 1; | |
1036 | } | |
1037 | ||
d352ac68 CM |
1038 | /* |
1039 | * when nowcow writeback call back. This checks for snapshots or COW copies | |
1040 | * of the extents that exist in the file, and COWs the file as required. | |
1041 | * | |
1042 | * If no cow copies or snapshots exist, we write directly to the existing | |
1043 | * blocks on disk | |
1044 | */ | |
7f366cfe CM |
1045 | static noinline int run_delalloc_nocow(struct inode *inode, |
1046 | struct page *locked_page, | |
771ed689 CM |
1047 | u64 start, u64 end, int *page_started, int force, |
1048 | unsigned long *nr_written) | |
be20aa9d | 1049 | { |
be20aa9d | 1050 | struct btrfs_root *root = BTRFS_I(inode)->root; |
7ea394f1 | 1051 | struct btrfs_trans_handle *trans; |
be20aa9d | 1052 | struct extent_buffer *leaf; |
be20aa9d | 1053 | struct btrfs_path *path; |
80ff3856 | 1054 | struct btrfs_file_extent_item *fi; |
be20aa9d | 1055 | struct btrfs_key found_key; |
80ff3856 YZ |
1056 | u64 cow_start; |
1057 | u64 cur_offset; | |
1058 | u64 extent_end; | |
5d4f98a2 | 1059 | u64 extent_offset; |
80ff3856 YZ |
1060 | u64 disk_bytenr; |
1061 | u64 num_bytes; | |
1062 | int extent_type; | |
1063 | int ret; | |
d899e052 | 1064 | int type; |
80ff3856 YZ |
1065 | int nocow; |
1066 | int check_prev = 1; | |
82d5902d | 1067 | bool nolock; |
33345d01 | 1068 | u64 ino = btrfs_ino(inode); |
be20aa9d CM |
1069 | |
1070 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
1071 | if (!path) |
1072 | return -ENOMEM; | |
82d5902d | 1073 | |
2cf8572d | 1074 | nolock = btrfs_is_free_space_inode(root, inode); |
82d5902d LZ |
1075 | |
1076 | if (nolock) | |
7a7eaa40 | 1077 | trans = btrfs_join_transaction_nolock(root); |
82d5902d | 1078 | else |
7a7eaa40 | 1079 | trans = btrfs_join_transaction(root); |
ff5714cc | 1080 | |
3612b495 | 1081 | BUG_ON(IS_ERR(trans)); |
74b21075 | 1082 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
be20aa9d | 1083 | |
80ff3856 YZ |
1084 | cow_start = (u64)-1; |
1085 | cur_offset = start; | |
1086 | while (1) { | |
33345d01 | 1087 | ret = btrfs_lookup_file_extent(trans, root, path, ino, |
80ff3856 YZ |
1088 | cur_offset, 0); |
1089 | BUG_ON(ret < 0); | |
1090 | if (ret > 0 && path->slots[0] > 0 && check_prev) { | |
1091 | leaf = path->nodes[0]; | |
1092 | btrfs_item_key_to_cpu(leaf, &found_key, | |
1093 | path->slots[0] - 1); | |
33345d01 | 1094 | if (found_key.objectid == ino && |
80ff3856 YZ |
1095 | found_key.type == BTRFS_EXTENT_DATA_KEY) |
1096 | path->slots[0]--; | |
1097 | } | |
1098 | check_prev = 0; | |
1099 | next_slot: | |
1100 | leaf = path->nodes[0]; | |
1101 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1102 | ret = btrfs_next_leaf(root, path); | |
1103 | if (ret < 0) | |
1104 | BUG_ON(1); | |
1105 | if (ret > 0) | |
1106 | break; | |
1107 | leaf = path->nodes[0]; | |
1108 | } | |
be20aa9d | 1109 | |
80ff3856 YZ |
1110 | nocow = 0; |
1111 | disk_bytenr = 0; | |
17d217fe | 1112 | num_bytes = 0; |
80ff3856 YZ |
1113 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1114 | ||
33345d01 | 1115 | if (found_key.objectid > ino || |
80ff3856 YZ |
1116 | found_key.type > BTRFS_EXTENT_DATA_KEY || |
1117 | found_key.offset > end) | |
1118 | break; | |
1119 | ||
1120 | if (found_key.offset > cur_offset) { | |
1121 | extent_end = found_key.offset; | |
e9061e21 | 1122 | extent_type = 0; |
80ff3856 YZ |
1123 | goto out_check; |
1124 | } | |
1125 | ||
1126 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1127 | struct btrfs_file_extent_item); | |
1128 | extent_type = btrfs_file_extent_type(leaf, fi); | |
1129 | ||
d899e052 YZ |
1130 | if (extent_type == BTRFS_FILE_EXTENT_REG || |
1131 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
80ff3856 | 1132 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
5d4f98a2 | 1133 | extent_offset = btrfs_file_extent_offset(leaf, fi); |
80ff3856 YZ |
1134 | extent_end = found_key.offset + |
1135 | btrfs_file_extent_num_bytes(leaf, fi); | |
1136 | if (extent_end <= start) { | |
1137 | path->slots[0]++; | |
1138 | goto next_slot; | |
1139 | } | |
17d217fe YZ |
1140 | if (disk_bytenr == 0) |
1141 | goto out_check; | |
80ff3856 YZ |
1142 | if (btrfs_file_extent_compression(leaf, fi) || |
1143 | btrfs_file_extent_encryption(leaf, fi) || | |
1144 | btrfs_file_extent_other_encoding(leaf, fi)) | |
1145 | goto out_check; | |
d899e052 YZ |
1146 | if (extent_type == BTRFS_FILE_EXTENT_REG && !force) |
1147 | goto out_check; | |
d2fb3437 | 1148 | if (btrfs_extent_readonly(root, disk_bytenr)) |
80ff3856 | 1149 | goto out_check; |
33345d01 | 1150 | if (btrfs_cross_ref_exist(trans, root, ino, |
5d4f98a2 YZ |
1151 | found_key.offset - |
1152 | extent_offset, disk_bytenr)) | |
17d217fe | 1153 | goto out_check; |
5d4f98a2 | 1154 | disk_bytenr += extent_offset; |
17d217fe YZ |
1155 | disk_bytenr += cur_offset - found_key.offset; |
1156 | num_bytes = min(end + 1, extent_end) - cur_offset; | |
1157 | /* | |
1158 | * force cow if csum exists in the range. | |
1159 | * this ensure that csum for a given extent are | |
1160 | * either valid or do not exist. | |
1161 | */ | |
1162 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) | |
1163 | goto out_check; | |
80ff3856 YZ |
1164 | nocow = 1; |
1165 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { | |
1166 | extent_end = found_key.offset + | |
1167 | btrfs_file_extent_inline_len(leaf, fi); | |
1168 | extent_end = ALIGN(extent_end, root->sectorsize); | |
1169 | } else { | |
1170 | BUG_ON(1); | |
1171 | } | |
1172 | out_check: | |
1173 | if (extent_end <= start) { | |
1174 | path->slots[0]++; | |
1175 | goto next_slot; | |
1176 | } | |
1177 | if (!nocow) { | |
1178 | if (cow_start == (u64)-1) | |
1179 | cow_start = cur_offset; | |
1180 | cur_offset = extent_end; | |
1181 | if (cur_offset > end) | |
1182 | break; | |
1183 | path->slots[0]++; | |
1184 | goto next_slot; | |
7ea394f1 YZ |
1185 | } |
1186 | ||
b3b4aa74 | 1187 | btrfs_release_path(path); |
80ff3856 YZ |
1188 | if (cow_start != (u64)-1) { |
1189 | ret = cow_file_range(inode, locked_page, cow_start, | |
771ed689 CM |
1190 | found_key.offset - 1, page_started, |
1191 | nr_written, 1); | |
80ff3856 YZ |
1192 | BUG_ON(ret); |
1193 | cow_start = (u64)-1; | |
7ea394f1 | 1194 | } |
80ff3856 | 1195 | |
d899e052 YZ |
1196 | if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
1197 | struct extent_map *em; | |
1198 | struct extent_map_tree *em_tree; | |
1199 | em_tree = &BTRFS_I(inode)->extent_tree; | |
172ddd60 | 1200 | em = alloc_extent_map(); |
c26a9203 | 1201 | BUG_ON(!em); |
d899e052 | 1202 | em->start = cur_offset; |
445a6944 | 1203 | em->orig_start = em->start; |
d899e052 YZ |
1204 | em->len = num_bytes; |
1205 | em->block_len = num_bytes; | |
1206 | em->block_start = disk_bytenr; | |
1207 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
1208 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
1209 | while (1) { | |
890871be | 1210 | write_lock(&em_tree->lock); |
d899e052 | 1211 | ret = add_extent_mapping(em_tree, em); |
890871be | 1212 | write_unlock(&em_tree->lock); |
d899e052 YZ |
1213 | if (ret != -EEXIST) { |
1214 | free_extent_map(em); | |
1215 | break; | |
1216 | } | |
1217 | btrfs_drop_extent_cache(inode, em->start, | |
1218 | em->start + em->len - 1, 0); | |
1219 | } | |
1220 | type = BTRFS_ORDERED_PREALLOC; | |
1221 | } else { | |
1222 | type = BTRFS_ORDERED_NOCOW; | |
1223 | } | |
80ff3856 YZ |
1224 | |
1225 | ret = btrfs_add_ordered_extent(inode, cur_offset, disk_bytenr, | |
d899e052 YZ |
1226 | num_bytes, num_bytes, type); |
1227 | BUG_ON(ret); | |
771ed689 | 1228 | |
efa56464 YZ |
1229 | if (root->root_key.objectid == |
1230 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
1231 | ret = btrfs_reloc_clone_csums(inode, cur_offset, | |
1232 | num_bytes); | |
1233 | BUG_ON(ret); | |
1234 | } | |
1235 | ||
d899e052 | 1236 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, |
a791e35e CM |
1237 | cur_offset, cur_offset + num_bytes - 1, |
1238 | locked_page, EXTENT_CLEAR_UNLOCK_PAGE | | |
1239 | EXTENT_CLEAR_UNLOCK | EXTENT_CLEAR_DELALLOC | | |
1240 | EXTENT_SET_PRIVATE2); | |
80ff3856 YZ |
1241 | cur_offset = extent_end; |
1242 | if (cur_offset > end) | |
1243 | break; | |
be20aa9d | 1244 | } |
b3b4aa74 | 1245 | btrfs_release_path(path); |
80ff3856 YZ |
1246 | |
1247 | if (cur_offset <= end && cow_start == (u64)-1) | |
1248 | cow_start = cur_offset; | |
1249 | if (cow_start != (u64)-1) { | |
1250 | ret = cow_file_range(inode, locked_page, cow_start, end, | |
771ed689 | 1251 | page_started, nr_written, 1); |
80ff3856 YZ |
1252 | BUG_ON(ret); |
1253 | } | |
1254 | ||
0cb59c99 JB |
1255 | if (nolock) { |
1256 | ret = btrfs_end_transaction_nolock(trans, root); | |
1257 | BUG_ON(ret); | |
1258 | } else { | |
1259 | ret = btrfs_end_transaction(trans, root); | |
1260 | BUG_ON(ret); | |
1261 | } | |
7ea394f1 | 1262 | btrfs_free_path(path); |
80ff3856 | 1263 | return 0; |
be20aa9d CM |
1264 | } |
1265 | ||
d352ac68 CM |
1266 | /* |
1267 | * extent_io.c call back to do delayed allocation processing | |
1268 | */ | |
c8b97818 | 1269 | static int run_delalloc_range(struct inode *inode, struct page *locked_page, |
771ed689 CM |
1270 | u64 start, u64 end, int *page_started, |
1271 | unsigned long *nr_written) | |
be20aa9d | 1272 | { |
be20aa9d | 1273 | int ret; |
7f366cfe | 1274 | struct btrfs_root *root = BTRFS_I(inode)->root; |
a2135011 | 1275 | |
6cbff00f | 1276 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) |
c8b97818 | 1277 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
d397712b | 1278 | page_started, 1, nr_written); |
6cbff00f | 1279 | else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC) |
d899e052 | 1280 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
d397712b | 1281 | page_started, 0, nr_written); |
1e701a32 | 1282 | else if (!btrfs_test_opt(root, COMPRESS) && |
75e7cb7f LB |
1283 | !(BTRFS_I(inode)->force_compress) && |
1284 | !(BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS)) | |
7f366cfe CM |
1285 | ret = cow_file_range(inode, locked_page, start, end, |
1286 | page_started, nr_written, 1); | |
be20aa9d | 1287 | else |
771ed689 | 1288 | ret = cow_file_range_async(inode, locked_page, start, end, |
d397712b | 1289 | page_started, nr_written); |
b888db2b CM |
1290 | return ret; |
1291 | } | |
1292 | ||
1bf85046 JM |
1293 | static void btrfs_split_extent_hook(struct inode *inode, |
1294 | struct extent_state *orig, u64 split) | |
9ed74f2d | 1295 | { |
0ca1f7ce | 1296 | /* not delalloc, ignore it */ |
9ed74f2d | 1297 | if (!(orig->state & EXTENT_DELALLOC)) |
1bf85046 | 1298 | return; |
9ed74f2d | 1299 | |
9e0baf60 JB |
1300 | spin_lock(&BTRFS_I(inode)->lock); |
1301 | BTRFS_I(inode)->outstanding_extents++; | |
1302 | spin_unlock(&BTRFS_I(inode)->lock); | |
9ed74f2d JB |
1303 | } |
1304 | ||
1305 | /* | |
1306 | * extent_io.c merge_extent_hook, used to track merged delayed allocation | |
1307 | * extents so we can keep track of new extents that are just merged onto old | |
1308 | * extents, such as when we are doing sequential writes, so we can properly | |
1309 | * account for the metadata space we'll need. | |
1310 | */ | |
1bf85046 JM |
1311 | static void btrfs_merge_extent_hook(struct inode *inode, |
1312 | struct extent_state *new, | |
1313 | struct extent_state *other) | |
9ed74f2d | 1314 | { |
9ed74f2d JB |
1315 | /* not delalloc, ignore it */ |
1316 | if (!(other->state & EXTENT_DELALLOC)) | |
1bf85046 | 1317 | return; |
9ed74f2d | 1318 | |
9e0baf60 JB |
1319 | spin_lock(&BTRFS_I(inode)->lock); |
1320 | BTRFS_I(inode)->outstanding_extents--; | |
1321 | spin_unlock(&BTRFS_I(inode)->lock); | |
9ed74f2d JB |
1322 | } |
1323 | ||
d352ac68 CM |
1324 | /* |
1325 | * extent_io.c set_bit_hook, used to track delayed allocation | |
1326 | * bytes in this file, and to maintain the list of inodes that | |
1327 | * have pending delalloc work to be done. | |
1328 | */ | |
1bf85046 JM |
1329 | static void btrfs_set_bit_hook(struct inode *inode, |
1330 | struct extent_state *state, int *bits) | |
291d673e | 1331 | { |
9ed74f2d | 1332 | |
75eff68e CM |
1333 | /* |
1334 | * set_bit and clear bit hooks normally require _irqsave/restore | |
27160b6b | 1335 | * but in this case, we are only testing for the DELALLOC |
75eff68e CM |
1336 | * bit, which is only set or cleared with irqs on |
1337 | */ | |
0ca1f7ce | 1338 | if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
291d673e | 1339 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 1340 | u64 len = state->end + 1 - state->start; |
2cf8572d | 1341 | bool do_list = !btrfs_is_free_space_inode(root, inode); |
9ed74f2d | 1342 | |
9e0baf60 | 1343 | if (*bits & EXTENT_FIRST_DELALLOC) { |
0ca1f7ce | 1344 | *bits &= ~EXTENT_FIRST_DELALLOC; |
9e0baf60 JB |
1345 | } else { |
1346 | spin_lock(&BTRFS_I(inode)->lock); | |
1347 | BTRFS_I(inode)->outstanding_extents++; | |
1348 | spin_unlock(&BTRFS_I(inode)->lock); | |
1349 | } | |
287a0ab9 | 1350 | |
75eff68e | 1351 | spin_lock(&root->fs_info->delalloc_lock); |
0ca1f7ce YZ |
1352 | BTRFS_I(inode)->delalloc_bytes += len; |
1353 | root->fs_info->delalloc_bytes += len; | |
0cb59c99 | 1354 | if (do_list && list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
ea8c2819 CM |
1355 | list_add_tail(&BTRFS_I(inode)->delalloc_inodes, |
1356 | &root->fs_info->delalloc_inodes); | |
1357 | } | |
75eff68e | 1358 | spin_unlock(&root->fs_info->delalloc_lock); |
291d673e | 1359 | } |
291d673e CM |
1360 | } |
1361 | ||
d352ac68 CM |
1362 | /* |
1363 | * extent_io.c clear_bit_hook, see set_bit_hook for why | |
1364 | */ | |
1bf85046 JM |
1365 | static void btrfs_clear_bit_hook(struct inode *inode, |
1366 | struct extent_state *state, int *bits) | |
291d673e | 1367 | { |
75eff68e CM |
1368 | /* |
1369 | * set_bit and clear bit hooks normally require _irqsave/restore | |
27160b6b | 1370 | * but in this case, we are only testing for the DELALLOC |
75eff68e CM |
1371 | * bit, which is only set or cleared with irqs on |
1372 | */ | |
0ca1f7ce | 1373 | if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
291d673e | 1374 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 1375 | u64 len = state->end + 1 - state->start; |
2cf8572d | 1376 | bool do_list = !btrfs_is_free_space_inode(root, inode); |
bcbfce8a | 1377 | |
9e0baf60 | 1378 | if (*bits & EXTENT_FIRST_DELALLOC) { |
0ca1f7ce | 1379 | *bits &= ~EXTENT_FIRST_DELALLOC; |
9e0baf60 JB |
1380 | } else if (!(*bits & EXTENT_DO_ACCOUNTING)) { |
1381 | spin_lock(&BTRFS_I(inode)->lock); | |
1382 | BTRFS_I(inode)->outstanding_extents--; | |
1383 | spin_unlock(&BTRFS_I(inode)->lock); | |
1384 | } | |
0ca1f7ce YZ |
1385 | |
1386 | if (*bits & EXTENT_DO_ACCOUNTING) | |
1387 | btrfs_delalloc_release_metadata(inode, len); | |
1388 | ||
0cb59c99 JB |
1389 | if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID |
1390 | && do_list) | |
0ca1f7ce | 1391 | btrfs_free_reserved_data_space(inode, len); |
9ed74f2d | 1392 | |
75eff68e | 1393 | spin_lock(&root->fs_info->delalloc_lock); |
0ca1f7ce YZ |
1394 | root->fs_info->delalloc_bytes -= len; |
1395 | BTRFS_I(inode)->delalloc_bytes -= len; | |
1396 | ||
0cb59c99 | 1397 | if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 && |
ea8c2819 CM |
1398 | !list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
1399 | list_del_init(&BTRFS_I(inode)->delalloc_inodes); | |
1400 | } | |
75eff68e | 1401 | spin_unlock(&root->fs_info->delalloc_lock); |
291d673e | 1402 | } |
291d673e CM |
1403 | } |
1404 | ||
d352ac68 CM |
1405 | /* |
1406 | * extent_io.c merge_bio_hook, this must check the chunk tree to make sure | |
1407 | * we don't create bios that span stripes or chunks | |
1408 | */ | |
239b14b3 | 1409 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
c8b97818 CM |
1410 | size_t size, struct bio *bio, |
1411 | unsigned long bio_flags) | |
239b14b3 CM |
1412 | { |
1413 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
1414 | struct btrfs_mapping_tree *map_tree; | |
a62b9401 | 1415 | u64 logical = (u64)bio->bi_sector << 9; |
239b14b3 CM |
1416 | u64 length = 0; |
1417 | u64 map_length; | |
239b14b3 CM |
1418 | int ret; |
1419 | ||
771ed689 CM |
1420 | if (bio_flags & EXTENT_BIO_COMPRESSED) |
1421 | return 0; | |
1422 | ||
f2d8d74d | 1423 | length = bio->bi_size; |
239b14b3 CM |
1424 | map_tree = &root->fs_info->mapping_tree; |
1425 | map_length = length; | |
cea9e445 | 1426 | ret = btrfs_map_block(map_tree, READ, logical, |
f188591e | 1427 | &map_length, NULL, 0); |
3444a972 JM |
1428 | /* Will always return 0 or 1 with map_multi == NULL */ |
1429 | BUG_ON(ret < 0); | |
d397712b | 1430 | if (map_length < length + size) |
239b14b3 | 1431 | return 1; |
3444a972 | 1432 | return 0; |
239b14b3 CM |
1433 | } |
1434 | ||
d352ac68 CM |
1435 | /* |
1436 | * in order to insert checksums into the metadata in large chunks, | |
1437 | * we wait until bio submission time. All the pages in the bio are | |
1438 | * checksummed and sums are attached onto the ordered extent record. | |
1439 | * | |
1440 | * At IO completion time the cums attached on the ordered extent record | |
1441 | * are inserted into the btree | |
1442 | */ | |
d397712b CM |
1443 | static int __btrfs_submit_bio_start(struct inode *inode, int rw, |
1444 | struct bio *bio, int mirror_num, | |
eaf25d93 CM |
1445 | unsigned long bio_flags, |
1446 | u64 bio_offset) | |
065631f6 | 1447 | { |
065631f6 | 1448 | struct btrfs_root *root = BTRFS_I(inode)->root; |
065631f6 | 1449 | int ret = 0; |
e015640f | 1450 | |
d20f7043 | 1451 | ret = btrfs_csum_one_bio(root, inode, bio, 0, 0); |
44b8bd7e | 1452 | BUG_ON(ret); |
4a69a410 CM |
1453 | return 0; |
1454 | } | |
e015640f | 1455 | |
4a69a410 CM |
1456 | /* |
1457 | * in order to insert checksums into the metadata in large chunks, | |
1458 | * we wait until bio submission time. All the pages in the bio are | |
1459 | * checksummed and sums are attached onto the ordered extent record. | |
1460 | * | |
1461 | * At IO completion time the cums attached on the ordered extent record | |
1462 | * are inserted into the btree | |
1463 | */ | |
b2950863 | 1464 | static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
1465 | int mirror_num, unsigned long bio_flags, |
1466 | u64 bio_offset) | |
4a69a410 CM |
1467 | { |
1468 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
8b712842 | 1469 | return btrfs_map_bio(root, rw, bio, mirror_num, 1); |
44b8bd7e CM |
1470 | } |
1471 | ||
d352ac68 | 1472 | /* |
cad321ad CM |
1473 | * extent_io.c submission hook. This does the right thing for csum calculation |
1474 | * on write, or reading the csums from the tree before a read | |
d352ac68 | 1475 | */ |
b2950863 | 1476 | static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
1477 | int mirror_num, unsigned long bio_flags, |
1478 | u64 bio_offset) | |
44b8bd7e CM |
1479 | { |
1480 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1481 | int ret = 0; | |
19b9bdb0 | 1482 | int skip_sum; |
0417341e | 1483 | int metadata = 0; |
44b8bd7e | 1484 | |
6cbff00f | 1485 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
cad321ad | 1486 | |
2cf8572d | 1487 | if (btrfs_is_free_space_inode(root, inode)) |
0417341e JM |
1488 | metadata = 2; |
1489 | ||
1490 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, metadata); | |
355808c2 JM |
1491 | if (ret) |
1492 | return ret; | |
065631f6 | 1493 | |
7b6d91da | 1494 | if (!(rw & REQ_WRITE)) { |
d20f7043 | 1495 | if (bio_flags & EXTENT_BIO_COMPRESSED) { |
c8b97818 CM |
1496 | return btrfs_submit_compressed_read(inode, bio, |
1497 | mirror_num, bio_flags); | |
c2db1073 TI |
1498 | } else if (!skip_sum) { |
1499 | ret = btrfs_lookup_bio_sums(root, inode, bio, NULL); | |
1500 | if (ret) | |
1501 | return ret; | |
1502 | } | |
4d1b5fb4 | 1503 | goto mapit; |
19b9bdb0 | 1504 | } else if (!skip_sum) { |
17d217fe YZ |
1505 | /* csum items have already been cloned */ |
1506 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) | |
1507 | goto mapit; | |
19b9bdb0 CM |
1508 | /* we're doing a write, do the async checksumming */ |
1509 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, | |
44b8bd7e | 1510 | inode, rw, bio, mirror_num, |
eaf25d93 CM |
1511 | bio_flags, bio_offset, |
1512 | __btrfs_submit_bio_start, | |
4a69a410 | 1513 | __btrfs_submit_bio_done); |
19b9bdb0 CM |
1514 | } |
1515 | ||
0b86a832 | 1516 | mapit: |
8b712842 | 1517 | return btrfs_map_bio(root, rw, bio, mirror_num, 0); |
065631f6 | 1518 | } |
6885f308 | 1519 | |
d352ac68 CM |
1520 | /* |
1521 | * given a list of ordered sums record them in the inode. This happens | |
1522 | * at IO completion time based on sums calculated at bio submission time. | |
1523 | */ | |
ba1da2f4 | 1524 | static noinline int add_pending_csums(struct btrfs_trans_handle *trans, |
e6dcd2dc CM |
1525 | struct inode *inode, u64 file_offset, |
1526 | struct list_head *list) | |
1527 | { | |
e6dcd2dc CM |
1528 | struct btrfs_ordered_sum *sum; |
1529 | ||
c6e30871 | 1530 | list_for_each_entry(sum, list, list) { |
d20f7043 CM |
1531 | btrfs_csum_file_blocks(trans, |
1532 | BTRFS_I(inode)->root->fs_info->csum_root, sum); | |
e6dcd2dc CM |
1533 | } |
1534 | return 0; | |
1535 | } | |
1536 | ||
2ac55d41 JB |
1537 | int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, |
1538 | struct extent_state **cached_state) | |
ea8c2819 | 1539 | { |
d397712b | 1540 | if ((end & (PAGE_CACHE_SIZE - 1)) == 0) |
771ed689 | 1541 | WARN_ON(1); |
ea8c2819 | 1542 | return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end, |
2ac55d41 | 1543 | cached_state, GFP_NOFS); |
ea8c2819 CM |
1544 | } |
1545 | ||
d352ac68 | 1546 | /* see btrfs_writepage_start_hook for details on why this is required */ |
247e743c CM |
1547 | struct btrfs_writepage_fixup { |
1548 | struct page *page; | |
1549 | struct btrfs_work work; | |
1550 | }; | |
1551 | ||
b2950863 | 1552 | static void btrfs_writepage_fixup_worker(struct btrfs_work *work) |
247e743c CM |
1553 | { |
1554 | struct btrfs_writepage_fixup *fixup; | |
1555 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 1556 | struct extent_state *cached_state = NULL; |
247e743c CM |
1557 | struct page *page; |
1558 | struct inode *inode; | |
1559 | u64 page_start; | |
1560 | u64 page_end; | |
87826df0 | 1561 | int ret; |
247e743c CM |
1562 | |
1563 | fixup = container_of(work, struct btrfs_writepage_fixup, work); | |
1564 | page = fixup->page; | |
4a096752 | 1565 | again: |
247e743c CM |
1566 | lock_page(page); |
1567 | if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { | |
1568 | ClearPageChecked(page); | |
1569 | goto out_page; | |
1570 | } | |
1571 | ||
1572 | inode = page->mapping->host; | |
1573 | page_start = page_offset(page); | |
1574 | page_end = page_offset(page) + PAGE_CACHE_SIZE - 1; | |
1575 | ||
2ac55d41 JB |
1576 | lock_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end, 0, |
1577 | &cached_state, GFP_NOFS); | |
4a096752 CM |
1578 | |
1579 | /* already ordered? We're done */ | |
8b62b72b | 1580 | if (PagePrivate2(page)) |
247e743c | 1581 | goto out; |
4a096752 CM |
1582 | |
1583 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
1584 | if (ordered) { | |
2ac55d41 JB |
1585 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, |
1586 | page_end, &cached_state, GFP_NOFS); | |
4a096752 CM |
1587 | unlock_page(page); |
1588 | btrfs_start_ordered_extent(inode, ordered, 1); | |
87826df0 | 1589 | btrfs_put_ordered_extent(ordered); |
4a096752 CM |
1590 | goto again; |
1591 | } | |
247e743c | 1592 | |
87826df0 JM |
1593 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
1594 | if (ret) { | |
1595 | mapping_set_error(page->mapping, ret); | |
1596 | end_extent_writepage(page, ret, page_start, page_end); | |
1597 | ClearPageChecked(page); | |
1598 | goto out; | |
1599 | } | |
1600 | ||
2ac55d41 | 1601 | btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state); |
247e743c | 1602 | ClearPageChecked(page); |
87826df0 | 1603 | set_page_dirty(page); |
247e743c | 1604 | out: |
2ac55d41 JB |
1605 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, page_end, |
1606 | &cached_state, GFP_NOFS); | |
247e743c CM |
1607 | out_page: |
1608 | unlock_page(page); | |
1609 | page_cache_release(page); | |
b897abec | 1610 | kfree(fixup); |
247e743c CM |
1611 | } |
1612 | ||
1613 | /* | |
1614 | * There are a few paths in the higher layers of the kernel that directly | |
1615 | * set the page dirty bit without asking the filesystem if it is a | |
1616 | * good idea. This causes problems because we want to make sure COW | |
1617 | * properly happens and the data=ordered rules are followed. | |
1618 | * | |
c8b97818 | 1619 | * In our case any range that doesn't have the ORDERED bit set |
247e743c CM |
1620 | * hasn't been properly setup for IO. We kick off an async process |
1621 | * to fix it up. The async helper will wait for ordered extents, set | |
1622 | * the delalloc bit and make it safe to write the page. | |
1623 | */ | |
b2950863 | 1624 | static int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end) |
247e743c CM |
1625 | { |
1626 | struct inode *inode = page->mapping->host; | |
1627 | struct btrfs_writepage_fixup *fixup; | |
1628 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
247e743c | 1629 | |
8b62b72b CM |
1630 | /* this page is properly in the ordered list */ |
1631 | if (TestClearPagePrivate2(page)) | |
247e743c CM |
1632 | return 0; |
1633 | ||
1634 | if (PageChecked(page)) | |
1635 | return -EAGAIN; | |
1636 | ||
1637 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); | |
1638 | if (!fixup) | |
1639 | return -EAGAIN; | |
f421950f | 1640 | |
247e743c CM |
1641 | SetPageChecked(page); |
1642 | page_cache_get(page); | |
1643 | fixup->work.func = btrfs_writepage_fixup_worker; | |
1644 | fixup->page = page; | |
1645 | btrfs_queue_worker(&root->fs_info->fixup_workers, &fixup->work); | |
87826df0 | 1646 | return -EBUSY; |
247e743c CM |
1647 | } |
1648 | ||
d899e052 YZ |
1649 | static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, |
1650 | struct inode *inode, u64 file_pos, | |
1651 | u64 disk_bytenr, u64 disk_num_bytes, | |
1652 | u64 num_bytes, u64 ram_bytes, | |
1653 | u8 compression, u8 encryption, | |
1654 | u16 other_encoding, int extent_type) | |
1655 | { | |
1656 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1657 | struct btrfs_file_extent_item *fi; | |
1658 | struct btrfs_path *path; | |
1659 | struct extent_buffer *leaf; | |
1660 | struct btrfs_key ins; | |
1661 | u64 hint; | |
1662 | int ret; | |
1663 | ||
1664 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
1665 | if (!path) |
1666 | return -ENOMEM; | |
d899e052 | 1667 | |
b9473439 | 1668 | path->leave_spinning = 1; |
a1ed835e CM |
1669 | |
1670 | /* | |
1671 | * we may be replacing one extent in the tree with another. | |
1672 | * The new extent is pinned in the extent map, and we don't want | |
1673 | * to drop it from the cache until it is completely in the btree. | |
1674 | * | |
1675 | * So, tell btrfs_drop_extents to leave this extent in the cache. | |
1676 | * the caller is expected to unpin it and allow it to be merged | |
1677 | * with the others. | |
1678 | */ | |
920bbbfb YZ |
1679 | ret = btrfs_drop_extents(trans, inode, file_pos, file_pos + num_bytes, |
1680 | &hint, 0); | |
d899e052 YZ |
1681 | BUG_ON(ret); |
1682 | ||
33345d01 | 1683 | ins.objectid = btrfs_ino(inode); |
d899e052 YZ |
1684 | ins.offset = file_pos; |
1685 | ins.type = BTRFS_EXTENT_DATA_KEY; | |
1686 | ret = btrfs_insert_empty_item(trans, root, path, &ins, sizeof(*fi)); | |
1687 | BUG_ON(ret); | |
1688 | leaf = path->nodes[0]; | |
1689 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1690 | struct btrfs_file_extent_item); | |
1691 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); | |
1692 | btrfs_set_file_extent_type(leaf, fi, extent_type); | |
1693 | btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr); | |
1694 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes); | |
1695 | btrfs_set_file_extent_offset(leaf, fi, 0); | |
1696 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); | |
1697 | btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes); | |
1698 | btrfs_set_file_extent_compression(leaf, fi, compression); | |
1699 | btrfs_set_file_extent_encryption(leaf, fi, encryption); | |
1700 | btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding); | |
b9473439 CM |
1701 | |
1702 | btrfs_unlock_up_safe(path, 1); | |
1703 | btrfs_set_lock_blocking(leaf); | |
1704 | ||
d899e052 YZ |
1705 | btrfs_mark_buffer_dirty(leaf); |
1706 | ||
1707 | inode_add_bytes(inode, num_bytes); | |
d899e052 YZ |
1708 | |
1709 | ins.objectid = disk_bytenr; | |
1710 | ins.offset = disk_num_bytes; | |
1711 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
5d4f98a2 YZ |
1712 | ret = btrfs_alloc_reserved_file_extent(trans, root, |
1713 | root->root_key.objectid, | |
33345d01 | 1714 | btrfs_ino(inode), file_pos, &ins); |
d899e052 | 1715 | BUG_ON(ret); |
d899e052 | 1716 | btrfs_free_path(path); |
b9473439 | 1717 | |
d899e052 YZ |
1718 | return 0; |
1719 | } | |
1720 | ||
5d13a98f CM |
1721 | /* |
1722 | * helper function for btrfs_finish_ordered_io, this | |
1723 | * just reads in some of the csum leaves to prime them into ram | |
1724 | * before we start the transaction. It limits the amount of btree | |
1725 | * reads required while inside the transaction. | |
1726 | */ | |
d352ac68 CM |
1727 | /* as ordered data IO finishes, this gets called so we can finish |
1728 | * an ordered extent if the range of bytes in the file it covers are | |
1729 | * fully written. | |
1730 | */ | |
211f90e6 | 1731 | static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) |
e6dcd2dc | 1732 | { |
e6dcd2dc | 1733 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 1734 | struct btrfs_trans_handle *trans = NULL; |
5d13a98f | 1735 | struct btrfs_ordered_extent *ordered_extent = NULL; |
e6dcd2dc | 1736 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2ac55d41 | 1737 | struct extent_state *cached_state = NULL; |
261507a0 | 1738 | int compress_type = 0; |
e6dcd2dc | 1739 | int ret; |
82d5902d | 1740 | bool nolock; |
e6dcd2dc | 1741 | |
5a1a3df1 JB |
1742 | ret = btrfs_dec_test_ordered_pending(inode, &ordered_extent, start, |
1743 | end - start + 1); | |
ba1da2f4 | 1744 | if (!ret) |
e6dcd2dc | 1745 | return 0; |
e6dcd2dc | 1746 | BUG_ON(!ordered_extent); |
efd049fb | 1747 | |
2cf8572d | 1748 | nolock = btrfs_is_free_space_inode(root, inode); |
0cb59c99 | 1749 | |
c2167754 YZ |
1750 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) { |
1751 | BUG_ON(!list_empty(&ordered_extent->list)); | |
1752 | ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent); | |
1753 | if (!ret) { | |
0cb59c99 | 1754 | if (nolock) |
7a7eaa40 | 1755 | trans = btrfs_join_transaction_nolock(root); |
0cb59c99 | 1756 | else |
7a7eaa40 | 1757 | trans = btrfs_join_transaction(root); |
3612b495 | 1758 | BUG_ON(IS_ERR(trans)); |
0ca1f7ce | 1759 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
2115133f | 1760 | ret = btrfs_update_inode_fallback(trans, root, inode); |
c2167754 | 1761 | BUG_ON(ret); |
c2167754 YZ |
1762 | } |
1763 | goto out; | |
1764 | } | |
e6dcd2dc | 1765 | |
2ac55d41 JB |
1766 | lock_extent_bits(io_tree, ordered_extent->file_offset, |
1767 | ordered_extent->file_offset + ordered_extent->len - 1, | |
1768 | 0, &cached_state, GFP_NOFS); | |
e6dcd2dc | 1769 | |
0cb59c99 | 1770 | if (nolock) |
7a7eaa40 | 1771 | trans = btrfs_join_transaction_nolock(root); |
0cb59c99 | 1772 | else |
7a7eaa40 | 1773 | trans = btrfs_join_transaction(root); |
3612b495 | 1774 | BUG_ON(IS_ERR(trans)); |
0ca1f7ce | 1775 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
c2167754 | 1776 | |
c8b97818 | 1777 | if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags)) |
261507a0 | 1778 | compress_type = ordered_extent->compress_type; |
d899e052 | 1779 | if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { |
261507a0 | 1780 | BUG_ON(compress_type); |
920bbbfb | 1781 | ret = btrfs_mark_extent_written(trans, inode, |
d899e052 YZ |
1782 | ordered_extent->file_offset, |
1783 | ordered_extent->file_offset + | |
1784 | ordered_extent->len); | |
1785 | BUG_ON(ret); | |
1786 | } else { | |
0af3d00b | 1787 | BUG_ON(root == root->fs_info->tree_root); |
d899e052 YZ |
1788 | ret = insert_reserved_file_extent(trans, inode, |
1789 | ordered_extent->file_offset, | |
1790 | ordered_extent->start, | |
1791 | ordered_extent->disk_len, | |
1792 | ordered_extent->len, | |
1793 | ordered_extent->len, | |
261507a0 | 1794 | compress_type, 0, 0, |
d899e052 | 1795 | BTRFS_FILE_EXTENT_REG); |
a1ed835e CM |
1796 | unpin_extent_cache(&BTRFS_I(inode)->extent_tree, |
1797 | ordered_extent->file_offset, | |
1798 | ordered_extent->len); | |
d899e052 YZ |
1799 | BUG_ON(ret); |
1800 | } | |
2ac55d41 JB |
1801 | unlock_extent_cached(io_tree, ordered_extent->file_offset, |
1802 | ordered_extent->file_offset + | |
1803 | ordered_extent->len - 1, &cached_state, GFP_NOFS); | |
1804 | ||
e6dcd2dc CM |
1805 | add_pending_csums(trans, inode, ordered_extent->file_offset, |
1806 | &ordered_extent->list); | |
1807 | ||
1ef30be1 | 1808 | ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
a39f7521 | 1809 | if (!ret || !test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { |
2115133f | 1810 | ret = btrfs_update_inode_fallback(trans, root, inode); |
1ef30be1 JB |
1811 | BUG_ON(ret); |
1812 | } | |
1813 | ret = 0; | |
c2167754 | 1814 | out: |
5b0e95bf | 1815 | if (root != root->fs_info->tree_root) |
0cb59c99 | 1816 | btrfs_delalloc_release_metadata(inode, ordered_extent->len); |
5b0e95bf JB |
1817 | if (trans) { |
1818 | if (nolock) | |
0cb59c99 | 1819 | btrfs_end_transaction_nolock(trans, root); |
5b0e95bf | 1820 | else |
0cb59c99 JB |
1821 | btrfs_end_transaction(trans, root); |
1822 | } | |
1823 | ||
e6dcd2dc CM |
1824 | /* once for us */ |
1825 | btrfs_put_ordered_extent(ordered_extent); | |
1826 | /* once for the tree */ | |
1827 | btrfs_put_ordered_extent(ordered_extent); | |
1828 | ||
e6dcd2dc CM |
1829 | return 0; |
1830 | } | |
1831 | ||
b2950863 | 1832 | static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end, |
211f90e6 CM |
1833 | struct extent_state *state, int uptodate) |
1834 | { | |
1abe9b8a | 1835 | trace_btrfs_writepage_end_io_hook(page, start, end, uptodate); |
1836 | ||
8b62b72b | 1837 | ClearPagePrivate2(page); |
211f90e6 CM |
1838 | return btrfs_finish_ordered_io(page->mapping->host, start, end); |
1839 | } | |
1840 | ||
d352ac68 CM |
1841 | /* |
1842 | * when reads are done, we need to check csums to verify the data is correct | |
4a54c8c1 JS |
1843 | * if there's a match, we allow the bio to finish. If not, the code in |
1844 | * extent_io.c will try to find good copies for us. | |
d352ac68 | 1845 | */ |
b2950863 | 1846 | static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
70dec807 | 1847 | struct extent_state *state) |
07157aac | 1848 | { |
35ebb934 | 1849 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 1850 | struct inode *inode = page->mapping->host; |
d1310b2e | 1851 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 1852 | char *kaddr; |
aadfeb6e | 1853 | u64 private = ~(u32)0; |
07157aac | 1854 | int ret; |
ff79f819 CM |
1855 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1856 | u32 csum = ~(u32)0; | |
d1310b2e | 1857 | |
d20f7043 CM |
1858 | if (PageChecked(page)) { |
1859 | ClearPageChecked(page); | |
1860 | goto good; | |
1861 | } | |
6cbff00f CH |
1862 | |
1863 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) | |
08d2f347 | 1864 | goto good; |
17d217fe YZ |
1865 | |
1866 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID && | |
9655d298 | 1867 | test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) { |
17d217fe YZ |
1868 | clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM, |
1869 | GFP_NOFS); | |
b6cda9bc | 1870 | return 0; |
17d217fe | 1871 | } |
d20f7043 | 1872 | |
c2e639f0 | 1873 | if (state && state->start == start) { |
70dec807 CM |
1874 | private = state->private; |
1875 | ret = 0; | |
1876 | } else { | |
1877 | ret = get_state_private(io_tree, start, &private); | |
1878 | } | |
9ab86c8e | 1879 | kaddr = kmap_atomic(page, KM_USER0); |
d397712b | 1880 | if (ret) |
07157aac | 1881 | goto zeroit; |
d397712b | 1882 | |
ff79f819 CM |
1883 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
1884 | btrfs_csum_final(csum, (char *)&csum); | |
d397712b | 1885 | if (csum != private) |
07157aac | 1886 | goto zeroit; |
d397712b | 1887 | |
9ab86c8e | 1888 | kunmap_atomic(kaddr, KM_USER0); |
d20f7043 | 1889 | good: |
07157aac CM |
1890 | return 0; |
1891 | ||
1892 | zeroit: | |
945d8962 | 1893 | printk_ratelimited(KERN_INFO "btrfs csum failed ino %llu off %llu csum %u " |
33345d01 LZ |
1894 | "private %llu\n", |
1895 | (unsigned long long)btrfs_ino(page->mapping->host), | |
193f284d CM |
1896 | (unsigned long long)start, csum, |
1897 | (unsigned long long)private); | |
db94535d CM |
1898 | memset(kaddr + offset, 1, end - start + 1); |
1899 | flush_dcache_page(page); | |
9ab86c8e | 1900 | kunmap_atomic(kaddr, KM_USER0); |
3b951516 CM |
1901 | if (private == 0) |
1902 | return 0; | |
7e38326f | 1903 | return -EIO; |
07157aac | 1904 | } |
b888db2b | 1905 | |
24bbcf04 YZ |
1906 | struct delayed_iput { |
1907 | struct list_head list; | |
1908 | struct inode *inode; | |
1909 | }; | |
1910 | ||
1911 | void btrfs_add_delayed_iput(struct inode *inode) | |
1912 | { | |
1913 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
1914 | struct delayed_iput *delayed; | |
1915 | ||
1916 | if (atomic_add_unless(&inode->i_count, -1, 1)) | |
1917 | return; | |
1918 | ||
1919 | delayed = kmalloc(sizeof(*delayed), GFP_NOFS | __GFP_NOFAIL); | |
1920 | delayed->inode = inode; | |
1921 | ||
1922 | spin_lock(&fs_info->delayed_iput_lock); | |
1923 | list_add_tail(&delayed->list, &fs_info->delayed_iputs); | |
1924 | spin_unlock(&fs_info->delayed_iput_lock); | |
1925 | } | |
1926 | ||
1927 | void btrfs_run_delayed_iputs(struct btrfs_root *root) | |
1928 | { | |
1929 | LIST_HEAD(list); | |
1930 | struct btrfs_fs_info *fs_info = root->fs_info; | |
1931 | struct delayed_iput *delayed; | |
1932 | int empty; | |
1933 | ||
1934 | spin_lock(&fs_info->delayed_iput_lock); | |
1935 | empty = list_empty(&fs_info->delayed_iputs); | |
1936 | spin_unlock(&fs_info->delayed_iput_lock); | |
1937 | if (empty) | |
1938 | return; | |
1939 | ||
1940 | down_read(&root->fs_info->cleanup_work_sem); | |
1941 | spin_lock(&fs_info->delayed_iput_lock); | |
1942 | list_splice_init(&fs_info->delayed_iputs, &list); | |
1943 | spin_unlock(&fs_info->delayed_iput_lock); | |
1944 | ||
1945 | while (!list_empty(&list)) { | |
1946 | delayed = list_entry(list.next, struct delayed_iput, list); | |
1947 | list_del(&delayed->list); | |
1948 | iput(delayed->inode); | |
1949 | kfree(delayed); | |
1950 | } | |
1951 | up_read(&root->fs_info->cleanup_work_sem); | |
1952 | } | |
1953 | ||
d68fc57b YZ |
1954 | enum btrfs_orphan_cleanup_state { |
1955 | ORPHAN_CLEANUP_STARTED = 1, | |
1956 | ORPHAN_CLEANUP_DONE = 2, | |
1957 | }; | |
1958 | ||
1959 | /* | |
42b2aa86 | 1960 | * This is called in transaction commit time. If there are no orphan |
d68fc57b YZ |
1961 | * files in the subvolume, it removes orphan item and frees block_rsv |
1962 | * structure. | |
1963 | */ | |
1964 | void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, | |
1965 | struct btrfs_root *root) | |
1966 | { | |
90290e19 | 1967 | struct btrfs_block_rsv *block_rsv; |
d68fc57b YZ |
1968 | int ret; |
1969 | ||
1970 | if (!list_empty(&root->orphan_list) || | |
1971 | root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) | |
1972 | return; | |
1973 | ||
90290e19 JB |
1974 | spin_lock(&root->orphan_lock); |
1975 | if (!list_empty(&root->orphan_list)) { | |
1976 | spin_unlock(&root->orphan_lock); | |
1977 | return; | |
1978 | } | |
1979 | ||
1980 | if (root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) { | |
1981 | spin_unlock(&root->orphan_lock); | |
1982 | return; | |
1983 | } | |
1984 | ||
1985 | block_rsv = root->orphan_block_rsv; | |
1986 | root->orphan_block_rsv = NULL; | |
1987 | spin_unlock(&root->orphan_lock); | |
1988 | ||
d68fc57b YZ |
1989 | if (root->orphan_item_inserted && |
1990 | btrfs_root_refs(&root->root_item) > 0) { | |
1991 | ret = btrfs_del_orphan_item(trans, root->fs_info->tree_root, | |
1992 | root->root_key.objectid); | |
1993 | BUG_ON(ret); | |
1994 | root->orphan_item_inserted = 0; | |
1995 | } | |
1996 | ||
90290e19 JB |
1997 | if (block_rsv) { |
1998 | WARN_ON(block_rsv->size > 0); | |
1999 | btrfs_free_block_rsv(root, block_rsv); | |
d68fc57b YZ |
2000 | } |
2001 | } | |
2002 | ||
7b128766 JB |
2003 | /* |
2004 | * This creates an orphan entry for the given inode in case something goes | |
2005 | * wrong in the middle of an unlink/truncate. | |
d68fc57b YZ |
2006 | * |
2007 | * NOTE: caller of this function should reserve 5 units of metadata for | |
2008 | * this function. | |
7b128766 JB |
2009 | */ |
2010 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) | |
2011 | { | |
2012 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
2013 | struct btrfs_block_rsv *block_rsv = NULL; |
2014 | int reserve = 0; | |
2015 | int insert = 0; | |
2016 | int ret; | |
7b128766 | 2017 | |
d68fc57b YZ |
2018 | if (!root->orphan_block_rsv) { |
2019 | block_rsv = btrfs_alloc_block_rsv(root); | |
b532402e TI |
2020 | if (!block_rsv) |
2021 | return -ENOMEM; | |
d68fc57b | 2022 | } |
7b128766 | 2023 | |
d68fc57b YZ |
2024 | spin_lock(&root->orphan_lock); |
2025 | if (!root->orphan_block_rsv) { | |
2026 | root->orphan_block_rsv = block_rsv; | |
2027 | } else if (block_rsv) { | |
2028 | btrfs_free_block_rsv(root, block_rsv); | |
2029 | block_rsv = NULL; | |
7b128766 | 2030 | } |
7b128766 | 2031 | |
d68fc57b YZ |
2032 | if (list_empty(&BTRFS_I(inode)->i_orphan)) { |
2033 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); | |
2034 | #if 0 | |
2035 | /* | |
2036 | * For proper ENOSPC handling, we should do orphan | |
2037 | * cleanup when mounting. But this introduces backward | |
2038 | * compatibility issue. | |
2039 | */ | |
2040 | if (!xchg(&root->orphan_item_inserted, 1)) | |
2041 | insert = 2; | |
2042 | else | |
2043 | insert = 1; | |
2044 | #endif | |
2045 | insert = 1; | |
7b128766 JB |
2046 | } |
2047 | ||
d68fc57b YZ |
2048 | if (!BTRFS_I(inode)->orphan_meta_reserved) { |
2049 | BTRFS_I(inode)->orphan_meta_reserved = 1; | |
2050 | reserve = 1; | |
2051 | } | |
2052 | spin_unlock(&root->orphan_lock); | |
7b128766 | 2053 | |
d68fc57b YZ |
2054 | /* grab metadata reservation from transaction handle */ |
2055 | if (reserve) { | |
2056 | ret = btrfs_orphan_reserve_metadata(trans, inode); | |
2057 | BUG_ON(ret); | |
2058 | } | |
7b128766 | 2059 | |
d68fc57b YZ |
2060 | /* insert an orphan item to track this unlinked/truncated file */ |
2061 | if (insert >= 1) { | |
33345d01 | 2062 | ret = btrfs_insert_orphan_item(trans, root, btrfs_ino(inode)); |
ee4d89f0 | 2063 | BUG_ON(ret && ret != -EEXIST); |
d68fc57b YZ |
2064 | } |
2065 | ||
2066 | /* insert an orphan item to track subvolume contains orphan files */ | |
2067 | if (insert >= 2) { | |
2068 | ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root, | |
2069 | root->root_key.objectid); | |
2070 | BUG_ON(ret); | |
2071 | } | |
2072 | return 0; | |
7b128766 JB |
2073 | } |
2074 | ||
2075 | /* | |
2076 | * We have done the truncate/delete so we can go ahead and remove the orphan | |
2077 | * item for this particular inode. | |
2078 | */ | |
2079 | int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode) | |
2080 | { | |
2081 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
2082 | int delete_item = 0; |
2083 | int release_rsv = 0; | |
7b128766 JB |
2084 | int ret = 0; |
2085 | ||
d68fc57b YZ |
2086 | spin_lock(&root->orphan_lock); |
2087 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { | |
2088 | list_del_init(&BTRFS_I(inode)->i_orphan); | |
2089 | delete_item = 1; | |
7b128766 JB |
2090 | } |
2091 | ||
d68fc57b YZ |
2092 | if (BTRFS_I(inode)->orphan_meta_reserved) { |
2093 | BTRFS_I(inode)->orphan_meta_reserved = 0; | |
2094 | release_rsv = 1; | |
7b128766 | 2095 | } |
d68fc57b | 2096 | spin_unlock(&root->orphan_lock); |
7b128766 | 2097 | |
d68fc57b | 2098 | if (trans && delete_item) { |
33345d01 | 2099 | ret = btrfs_del_orphan_item(trans, root, btrfs_ino(inode)); |
d68fc57b YZ |
2100 | BUG_ON(ret); |
2101 | } | |
7b128766 | 2102 | |
d68fc57b YZ |
2103 | if (release_rsv) |
2104 | btrfs_orphan_release_metadata(inode); | |
7b128766 | 2105 | |
d68fc57b | 2106 | return 0; |
7b128766 JB |
2107 | } |
2108 | ||
2109 | /* | |
2110 | * this cleans up any orphans that may be left on the list from the last use | |
2111 | * of this root. | |
2112 | */ | |
66b4ffd1 | 2113 | int btrfs_orphan_cleanup(struct btrfs_root *root) |
7b128766 JB |
2114 | { |
2115 | struct btrfs_path *path; | |
2116 | struct extent_buffer *leaf; | |
7b128766 JB |
2117 | struct btrfs_key key, found_key; |
2118 | struct btrfs_trans_handle *trans; | |
2119 | struct inode *inode; | |
8f6d7f4f | 2120 | u64 last_objectid = 0; |
7b128766 JB |
2121 | int ret = 0, nr_unlink = 0, nr_truncate = 0; |
2122 | ||
d68fc57b | 2123 | if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED)) |
66b4ffd1 | 2124 | return 0; |
c71bf099 YZ |
2125 | |
2126 | path = btrfs_alloc_path(); | |
66b4ffd1 JB |
2127 | if (!path) { |
2128 | ret = -ENOMEM; | |
2129 | goto out; | |
2130 | } | |
7b128766 JB |
2131 | path->reada = -1; |
2132 | ||
2133 | key.objectid = BTRFS_ORPHAN_OBJECTID; | |
2134 | btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); | |
2135 | key.offset = (u64)-1; | |
2136 | ||
7b128766 JB |
2137 | while (1) { |
2138 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
66b4ffd1 JB |
2139 | if (ret < 0) |
2140 | goto out; | |
7b128766 JB |
2141 | |
2142 | /* | |
2143 | * if ret == 0 means we found what we were searching for, which | |
25985edc | 2144 | * is weird, but possible, so only screw with path if we didn't |
7b128766 JB |
2145 | * find the key and see if we have stuff that matches |
2146 | */ | |
2147 | if (ret > 0) { | |
66b4ffd1 | 2148 | ret = 0; |
7b128766 JB |
2149 | if (path->slots[0] == 0) |
2150 | break; | |
2151 | path->slots[0]--; | |
2152 | } | |
2153 | ||
2154 | /* pull out the item */ | |
2155 | leaf = path->nodes[0]; | |
7b128766 JB |
2156 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
2157 | ||
2158 | /* make sure the item matches what we want */ | |
2159 | if (found_key.objectid != BTRFS_ORPHAN_OBJECTID) | |
2160 | break; | |
2161 | if (btrfs_key_type(&found_key) != BTRFS_ORPHAN_ITEM_KEY) | |
2162 | break; | |
2163 | ||
2164 | /* release the path since we're done with it */ | |
b3b4aa74 | 2165 | btrfs_release_path(path); |
7b128766 JB |
2166 | |
2167 | /* | |
2168 | * this is where we are basically btrfs_lookup, without the | |
2169 | * crossing root thing. we store the inode number in the | |
2170 | * offset of the orphan item. | |
2171 | */ | |
8f6d7f4f JB |
2172 | |
2173 | if (found_key.offset == last_objectid) { | |
2174 | printk(KERN_ERR "btrfs: Error removing orphan entry, " | |
2175 | "stopping orphan cleanup\n"); | |
2176 | ret = -EINVAL; | |
2177 | goto out; | |
2178 | } | |
2179 | ||
2180 | last_objectid = found_key.offset; | |
2181 | ||
5d4f98a2 YZ |
2182 | found_key.objectid = found_key.offset; |
2183 | found_key.type = BTRFS_INODE_ITEM_KEY; | |
2184 | found_key.offset = 0; | |
73f73415 | 2185 | inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL); |
a8c9e576 JB |
2186 | ret = PTR_RET(inode); |
2187 | if (ret && ret != -ESTALE) | |
66b4ffd1 | 2188 | goto out; |
7b128766 | 2189 | |
f8e9e0b0 AJ |
2190 | if (ret == -ESTALE && root == root->fs_info->tree_root) { |
2191 | struct btrfs_root *dead_root; | |
2192 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2193 | int is_dead_root = 0; | |
2194 | ||
2195 | /* | |
2196 | * this is an orphan in the tree root. Currently these | |
2197 | * could come from 2 sources: | |
2198 | * a) a snapshot deletion in progress | |
2199 | * b) a free space cache inode | |
2200 | * We need to distinguish those two, as the snapshot | |
2201 | * orphan must not get deleted. | |
2202 | * find_dead_roots already ran before us, so if this | |
2203 | * is a snapshot deletion, we should find the root | |
2204 | * in the dead_roots list | |
2205 | */ | |
2206 | spin_lock(&fs_info->trans_lock); | |
2207 | list_for_each_entry(dead_root, &fs_info->dead_roots, | |
2208 | root_list) { | |
2209 | if (dead_root->root_key.objectid == | |
2210 | found_key.objectid) { | |
2211 | is_dead_root = 1; | |
2212 | break; | |
2213 | } | |
2214 | } | |
2215 | spin_unlock(&fs_info->trans_lock); | |
2216 | if (is_dead_root) { | |
2217 | /* prevent this orphan from being found again */ | |
2218 | key.offset = found_key.objectid - 1; | |
2219 | continue; | |
2220 | } | |
2221 | } | |
7b128766 | 2222 | /* |
a8c9e576 JB |
2223 | * Inode is already gone but the orphan item is still there, |
2224 | * kill the orphan item. | |
7b128766 | 2225 | */ |
a8c9e576 JB |
2226 | if (ret == -ESTALE) { |
2227 | trans = btrfs_start_transaction(root, 1); | |
66b4ffd1 JB |
2228 | if (IS_ERR(trans)) { |
2229 | ret = PTR_ERR(trans); | |
2230 | goto out; | |
2231 | } | |
a8c9e576 JB |
2232 | ret = btrfs_del_orphan_item(trans, root, |
2233 | found_key.objectid); | |
2234 | BUG_ON(ret); | |
5b21f2ed | 2235 | btrfs_end_transaction(trans, root); |
7b128766 JB |
2236 | continue; |
2237 | } | |
2238 | ||
a8c9e576 JB |
2239 | /* |
2240 | * add this inode to the orphan list so btrfs_orphan_del does | |
2241 | * the proper thing when we hit it | |
2242 | */ | |
2243 | spin_lock(&root->orphan_lock); | |
2244 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); | |
2245 | spin_unlock(&root->orphan_lock); | |
2246 | ||
7b128766 JB |
2247 | /* if we have links, this was a truncate, lets do that */ |
2248 | if (inode->i_nlink) { | |
a41ad394 JB |
2249 | if (!S_ISREG(inode->i_mode)) { |
2250 | WARN_ON(1); | |
2251 | iput(inode); | |
2252 | continue; | |
2253 | } | |
7b128766 | 2254 | nr_truncate++; |
66b4ffd1 | 2255 | ret = btrfs_truncate(inode); |
7b128766 JB |
2256 | } else { |
2257 | nr_unlink++; | |
2258 | } | |
2259 | ||
2260 | /* this will do delete_inode and everything for us */ | |
2261 | iput(inode); | |
66b4ffd1 JB |
2262 | if (ret) |
2263 | goto out; | |
7b128766 | 2264 | } |
3254c876 MX |
2265 | /* release the path since we're done with it */ |
2266 | btrfs_release_path(path); | |
2267 | ||
d68fc57b YZ |
2268 | root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE; |
2269 | ||
2270 | if (root->orphan_block_rsv) | |
2271 | btrfs_block_rsv_release(root, root->orphan_block_rsv, | |
2272 | (u64)-1); | |
2273 | ||
2274 | if (root->orphan_block_rsv || root->orphan_item_inserted) { | |
7a7eaa40 | 2275 | trans = btrfs_join_transaction(root); |
66b4ffd1 JB |
2276 | if (!IS_ERR(trans)) |
2277 | btrfs_end_transaction(trans, root); | |
d68fc57b | 2278 | } |
7b128766 JB |
2279 | |
2280 | if (nr_unlink) | |
2281 | printk(KERN_INFO "btrfs: unlinked %d orphans\n", nr_unlink); | |
2282 | if (nr_truncate) | |
2283 | printk(KERN_INFO "btrfs: truncated %d orphans\n", nr_truncate); | |
66b4ffd1 JB |
2284 | |
2285 | out: | |
2286 | if (ret) | |
2287 | printk(KERN_CRIT "btrfs: could not do orphan cleanup %d\n", ret); | |
2288 | btrfs_free_path(path); | |
2289 | return ret; | |
7b128766 JB |
2290 | } |
2291 | ||
46a53cca CM |
2292 | /* |
2293 | * very simple check to peek ahead in the leaf looking for xattrs. If we | |
2294 | * don't find any xattrs, we know there can't be any acls. | |
2295 | * | |
2296 | * slot is the slot the inode is in, objectid is the objectid of the inode | |
2297 | */ | |
2298 | static noinline int acls_after_inode_item(struct extent_buffer *leaf, | |
2299 | int slot, u64 objectid) | |
2300 | { | |
2301 | u32 nritems = btrfs_header_nritems(leaf); | |
2302 | struct btrfs_key found_key; | |
2303 | int scanned = 0; | |
2304 | ||
2305 | slot++; | |
2306 | while (slot < nritems) { | |
2307 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
2308 | ||
2309 | /* we found a different objectid, there must not be acls */ | |
2310 | if (found_key.objectid != objectid) | |
2311 | return 0; | |
2312 | ||
2313 | /* we found an xattr, assume we've got an acl */ | |
2314 | if (found_key.type == BTRFS_XATTR_ITEM_KEY) | |
2315 | return 1; | |
2316 | ||
2317 | /* | |
2318 | * we found a key greater than an xattr key, there can't | |
2319 | * be any acls later on | |
2320 | */ | |
2321 | if (found_key.type > BTRFS_XATTR_ITEM_KEY) | |
2322 | return 0; | |
2323 | ||
2324 | slot++; | |
2325 | scanned++; | |
2326 | ||
2327 | /* | |
2328 | * it goes inode, inode backrefs, xattrs, extents, | |
2329 | * so if there are a ton of hard links to an inode there can | |
2330 | * be a lot of backrefs. Don't waste time searching too hard, | |
2331 | * this is just an optimization | |
2332 | */ | |
2333 | if (scanned >= 8) | |
2334 | break; | |
2335 | } | |
2336 | /* we hit the end of the leaf before we found an xattr or | |
2337 | * something larger than an xattr. We have to assume the inode | |
2338 | * has acls | |
2339 | */ | |
2340 | return 1; | |
2341 | } | |
2342 | ||
d352ac68 CM |
2343 | /* |
2344 | * read an inode from the btree into the in-memory inode | |
2345 | */ | |
5d4f98a2 | 2346 | static void btrfs_read_locked_inode(struct inode *inode) |
39279cc3 CM |
2347 | { |
2348 | struct btrfs_path *path; | |
5f39d397 | 2349 | struct extent_buffer *leaf; |
39279cc3 | 2350 | struct btrfs_inode_item *inode_item; |
0b86a832 | 2351 | struct btrfs_timespec *tspec; |
39279cc3 CM |
2352 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2353 | struct btrfs_key location; | |
46a53cca | 2354 | int maybe_acls; |
618e21d5 | 2355 | u32 rdev; |
39279cc3 | 2356 | int ret; |
2f7e33d4 MX |
2357 | bool filled = false; |
2358 | ||
2359 | ret = btrfs_fill_inode(inode, &rdev); | |
2360 | if (!ret) | |
2361 | filled = true; | |
39279cc3 CM |
2362 | |
2363 | path = btrfs_alloc_path(); | |
1748f843 MF |
2364 | if (!path) |
2365 | goto make_bad; | |
2366 | ||
d90c7321 | 2367 | path->leave_spinning = 1; |
39279cc3 | 2368 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 2369 | |
39279cc3 | 2370 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 2371 | if (ret) |
39279cc3 | 2372 | goto make_bad; |
39279cc3 | 2373 | |
5f39d397 | 2374 | leaf = path->nodes[0]; |
2f7e33d4 MX |
2375 | |
2376 | if (filled) | |
2377 | goto cache_acl; | |
2378 | ||
5f39d397 CM |
2379 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
2380 | struct btrfs_inode_item); | |
5f39d397 | 2381 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); |
bfe86848 | 2382 | set_nlink(inode, btrfs_inode_nlink(leaf, inode_item)); |
5f39d397 CM |
2383 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); |
2384 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
dbe674a9 | 2385 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
5f39d397 CM |
2386 | |
2387 | tspec = btrfs_inode_atime(inode_item); | |
2388 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
2389 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
2390 | ||
2391 | tspec = btrfs_inode_mtime(inode_item); | |
2392 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
2393 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
2394 | ||
2395 | tspec = btrfs_inode_ctime(inode_item); | |
2396 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
2397 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
2398 | ||
a76a3cd4 | 2399 | inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item)); |
e02119d5 | 2400 | BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item); |
c3027eb5 | 2401 | BTRFS_I(inode)->sequence = btrfs_inode_sequence(leaf, inode_item); |
e02119d5 | 2402 | inode->i_generation = BTRFS_I(inode)->generation; |
618e21d5 | 2403 | inode->i_rdev = 0; |
5f39d397 CM |
2404 | rdev = btrfs_inode_rdev(leaf, inode_item); |
2405 | ||
aec7477b | 2406 | BTRFS_I(inode)->index_cnt = (u64)-1; |
d2fb3437 | 2407 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
2f7e33d4 | 2408 | cache_acl: |
46a53cca CM |
2409 | /* |
2410 | * try to precache a NULL acl entry for files that don't have | |
2411 | * any xattrs or acls | |
2412 | */ | |
33345d01 LZ |
2413 | maybe_acls = acls_after_inode_item(leaf, path->slots[0], |
2414 | btrfs_ino(inode)); | |
72c04902 AV |
2415 | if (!maybe_acls) |
2416 | cache_no_acl(inode); | |
46a53cca | 2417 | |
39279cc3 | 2418 | btrfs_free_path(path); |
39279cc3 | 2419 | |
39279cc3 | 2420 | switch (inode->i_mode & S_IFMT) { |
39279cc3 CM |
2421 | case S_IFREG: |
2422 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 2423 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 2424 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
2425 | inode->i_fop = &btrfs_file_operations; |
2426 | inode->i_op = &btrfs_file_inode_operations; | |
2427 | break; | |
2428 | case S_IFDIR: | |
2429 | inode->i_fop = &btrfs_dir_file_operations; | |
2430 | if (root == root->fs_info->tree_root) | |
2431 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
2432 | else | |
2433 | inode->i_op = &btrfs_dir_inode_operations; | |
2434 | break; | |
2435 | case S_IFLNK: | |
2436 | inode->i_op = &btrfs_symlink_inode_operations; | |
2437 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 2438 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 2439 | break; |
618e21d5 | 2440 | default: |
0279b4cd | 2441 | inode->i_op = &btrfs_special_inode_operations; |
618e21d5 JB |
2442 | init_special_inode(inode, inode->i_mode, rdev); |
2443 | break; | |
39279cc3 | 2444 | } |
6cbff00f CH |
2445 | |
2446 | btrfs_update_iflags(inode); | |
39279cc3 CM |
2447 | return; |
2448 | ||
2449 | make_bad: | |
39279cc3 | 2450 | btrfs_free_path(path); |
39279cc3 CM |
2451 | make_bad_inode(inode); |
2452 | } | |
2453 | ||
d352ac68 CM |
2454 | /* |
2455 | * given a leaf and an inode, copy the inode fields into the leaf | |
2456 | */ | |
e02119d5 CM |
2457 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
2458 | struct extent_buffer *leaf, | |
5f39d397 | 2459 | struct btrfs_inode_item *item, |
39279cc3 CM |
2460 | struct inode *inode) |
2461 | { | |
5f39d397 CM |
2462 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
2463 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
dbe674a9 | 2464 | btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size); |
5f39d397 CM |
2465 | btrfs_set_inode_mode(leaf, item, inode->i_mode); |
2466 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
2467 | ||
2468 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
2469 | inode->i_atime.tv_sec); | |
2470 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
2471 | inode->i_atime.tv_nsec); | |
2472 | ||
2473 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
2474 | inode->i_mtime.tv_sec); | |
2475 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
2476 | inode->i_mtime.tv_nsec); | |
2477 | ||
2478 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
2479 | inode->i_ctime.tv_sec); | |
2480 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
2481 | inode->i_ctime.tv_nsec); | |
2482 | ||
a76a3cd4 | 2483 | btrfs_set_inode_nbytes(leaf, item, inode_get_bytes(inode)); |
e02119d5 | 2484 | btrfs_set_inode_generation(leaf, item, BTRFS_I(inode)->generation); |
c3027eb5 | 2485 | btrfs_set_inode_sequence(leaf, item, BTRFS_I(inode)->sequence); |
e02119d5 | 2486 | btrfs_set_inode_transid(leaf, item, trans->transid); |
5f39d397 | 2487 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); |
b98b6767 | 2488 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
d82a6f1d | 2489 | btrfs_set_inode_block_group(leaf, item, 0); |
39279cc3 CM |
2490 | } |
2491 | ||
d352ac68 CM |
2492 | /* |
2493 | * copy everything in the in-memory inode into the btree. | |
2494 | */ | |
2115133f | 2495 | static noinline int btrfs_update_inode_item(struct btrfs_trans_handle *trans, |
d397712b | 2496 | struct btrfs_root *root, struct inode *inode) |
39279cc3 CM |
2497 | { |
2498 | struct btrfs_inode_item *inode_item; | |
2499 | struct btrfs_path *path; | |
5f39d397 | 2500 | struct extent_buffer *leaf; |
39279cc3 CM |
2501 | int ret; |
2502 | ||
2503 | path = btrfs_alloc_path(); | |
16cdcec7 MX |
2504 | if (!path) |
2505 | return -ENOMEM; | |
2506 | ||
b9473439 | 2507 | path->leave_spinning = 1; |
16cdcec7 MX |
2508 | ret = btrfs_lookup_inode(trans, root, path, &BTRFS_I(inode)->location, |
2509 | 1); | |
39279cc3 CM |
2510 | if (ret) { |
2511 | if (ret > 0) | |
2512 | ret = -ENOENT; | |
2513 | goto failed; | |
2514 | } | |
2515 | ||
b4ce94de | 2516 | btrfs_unlock_up_safe(path, 1); |
5f39d397 CM |
2517 | leaf = path->nodes[0]; |
2518 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
16cdcec7 | 2519 | struct btrfs_inode_item); |
39279cc3 | 2520 | |
e02119d5 | 2521 | fill_inode_item(trans, leaf, inode_item, inode); |
5f39d397 | 2522 | btrfs_mark_buffer_dirty(leaf); |
15ee9bc7 | 2523 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
2524 | ret = 0; |
2525 | failed: | |
39279cc3 CM |
2526 | btrfs_free_path(path); |
2527 | return ret; | |
2528 | } | |
2529 | ||
2115133f CM |
2530 | /* |
2531 | * copy everything in the in-memory inode into the btree. | |
2532 | */ | |
2533 | noinline int btrfs_update_inode(struct btrfs_trans_handle *trans, | |
2534 | struct btrfs_root *root, struct inode *inode) | |
2535 | { | |
2536 | int ret; | |
2537 | ||
2538 | /* | |
2539 | * If the inode is a free space inode, we can deadlock during commit | |
2540 | * if we put it into the delayed code. | |
2541 | * | |
2542 | * The data relocation inode should also be directly updated | |
2543 | * without delay | |
2544 | */ | |
2545 | if (!btrfs_is_free_space_inode(root, inode) | |
2546 | && root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
2547 | ret = btrfs_delayed_update_inode(trans, root, inode); | |
2548 | if (!ret) | |
2549 | btrfs_set_inode_last_trans(trans, inode); | |
2550 | return ret; | |
2551 | } | |
2552 | ||
2553 | return btrfs_update_inode_item(trans, root, inode); | |
2554 | } | |
2555 | ||
2556 | static noinline int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, | |
2557 | struct btrfs_root *root, struct inode *inode) | |
2558 | { | |
2559 | int ret; | |
2560 | ||
2561 | ret = btrfs_update_inode(trans, root, inode); | |
2562 | if (ret == -ENOSPC) | |
2563 | return btrfs_update_inode_item(trans, root, inode); | |
2564 | return ret; | |
2565 | } | |
2566 | ||
d352ac68 CM |
2567 | /* |
2568 | * unlink helper that gets used here in inode.c and in the tree logging | |
2569 | * recovery code. It remove a link in a directory with a given name, and | |
2570 | * also drops the back refs in the inode to the directory | |
2571 | */ | |
92986796 AV |
2572 | static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
2573 | struct btrfs_root *root, | |
2574 | struct inode *dir, struct inode *inode, | |
2575 | const char *name, int name_len) | |
39279cc3 CM |
2576 | { |
2577 | struct btrfs_path *path; | |
39279cc3 | 2578 | int ret = 0; |
5f39d397 | 2579 | struct extent_buffer *leaf; |
39279cc3 | 2580 | struct btrfs_dir_item *di; |
5f39d397 | 2581 | struct btrfs_key key; |
aec7477b | 2582 | u64 index; |
33345d01 LZ |
2583 | u64 ino = btrfs_ino(inode); |
2584 | u64 dir_ino = btrfs_ino(dir); | |
39279cc3 CM |
2585 | |
2586 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
2587 | if (!path) { |
2588 | ret = -ENOMEM; | |
554233a6 | 2589 | goto out; |
54aa1f4d CM |
2590 | } |
2591 | ||
b9473439 | 2592 | path->leave_spinning = 1; |
33345d01 | 2593 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
39279cc3 CM |
2594 | name, name_len, -1); |
2595 | if (IS_ERR(di)) { | |
2596 | ret = PTR_ERR(di); | |
2597 | goto err; | |
2598 | } | |
2599 | if (!di) { | |
2600 | ret = -ENOENT; | |
2601 | goto err; | |
2602 | } | |
5f39d397 CM |
2603 | leaf = path->nodes[0]; |
2604 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 2605 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
2606 | if (ret) |
2607 | goto err; | |
b3b4aa74 | 2608 | btrfs_release_path(path); |
39279cc3 | 2609 | |
33345d01 LZ |
2610 | ret = btrfs_del_inode_ref(trans, root, name, name_len, ino, |
2611 | dir_ino, &index); | |
aec7477b | 2612 | if (ret) { |
d397712b | 2613 | printk(KERN_INFO "btrfs failed to delete reference to %.*s, " |
33345d01 LZ |
2614 | "inode %llu parent %llu\n", name_len, name, |
2615 | (unsigned long long)ino, (unsigned long long)dir_ino); | |
aec7477b JB |
2616 | goto err; |
2617 | } | |
2618 | ||
16cdcec7 MX |
2619 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
2620 | if (ret) | |
39279cc3 | 2621 | goto err; |
39279cc3 | 2622 | |
e02119d5 | 2623 | ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len, |
33345d01 | 2624 | inode, dir_ino); |
49eb7e46 | 2625 | BUG_ON(ret != 0 && ret != -ENOENT); |
e02119d5 CM |
2626 | |
2627 | ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len, | |
2628 | dir, index); | |
6418c961 CM |
2629 | if (ret == -ENOENT) |
2630 | ret = 0; | |
39279cc3 CM |
2631 | err: |
2632 | btrfs_free_path(path); | |
e02119d5 CM |
2633 | if (ret) |
2634 | goto out; | |
2635 | ||
2636 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
2637 | inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
2638 | btrfs_update_inode(trans, root, dir); | |
e02119d5 | 2639 | out: |
39279cc3 CM |
2640 | return ret; |
2641 | } | |
2642 | ||
92986796 AV |
2643 | int btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
2644 | struct btrfs_root *root, | |
2645 | struct inode *dir, struct inode *inode, | |
2646 | const char *name, int name_len) | |
2647 | { | |
2648 | int ret; | |
2649 | ret = __btrfs_unlink_inode(trans, root, dir, inode, name, name_len); | |
2650 | if (!ret) { | |
2651 | btrfs_drop_nlink(inode); | |
2652 | ret = btrfs_update_inode(trans, root, inode); | |
2653 | } | |
2654 | return ret; | |
2655 | } | |
2656 | ||
2657 | ||
a22285a6 YZ |
2658 | /* helper to check if there is any shared block in the path */ |
2659 | static int check_path_shared(struct btrfs_root *root, | |
2660 | struct btrfs_path *path) | |
39279cc3 | 2661 | { |
a22285a6 YZ |
2662 | struct extent_buffer *eb; |
2663 | int level; | |
0e4dcbef | 2664 | u64 refs = 1; |
5df6a9f6 | 2665 | |
a22285a6 | 2666 | for (level = 0; level < BTRFS_MAX_LEVEL; level++) { |
dedefd72 JB |
2667 | int ret; |
2668 | ||
a22285a6 YZ |
2669 | if (!path->nodes[level]) |
2670 | break; | |
2671 | eb = path->nodes[level]; | |
2672 | if (!btrfs_block_can_be_shared(root, eb)) | |
2673 | continue; | |
2674 | ret = btrfs_lookup_extent_info(NULL, root, eb->start, eb->len, | |
2675 | &refs, NULL); | |
2676 | if (refs > 1) | |
2677 | return 1; | |
5df6a9f6 | 2678 | } |
dedefd72 | 2679 | return 0; |
39279cc3 CM |
2680 | } |
2681 | ||
a22285a6 YZ |
2682 | /* |
2683 | * helper to start transaction for unlink and rmdir. | |
2684 | * | |
2685 | * unlink and rmdir are special in btrfs, they do not always free space. | |
2686 | * so in enospc case, we should make sure they will free space before | |
2687 | * allowing them to use the global metadata reservation. | |
2688 | */ | |
2689 | static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir, | |
2690 | struct dentry *dentry) | |
4df27c4d | 2691 | { |
39279cc3 | 2692 | struct btrfs_trans_handle *trans; |
a22285a6 | 2693 | struct btrfs_root *root = BTRFS_I(dir)->root; |
4df27c4d | 2694 | struct btrfs_path *path; |
a22285a6 | 2695 | struct btrfs_inode_ref *ref; |
4df27c4d | 2696 | struct btrfs_dir_item *di; |
7b128766 | 2697 | struct inode *inode = dentry->d_inode; |
4df27c4d | 2698 | u64 index; |
a22285a6 YZ |
2699 | int check_link = 1; |
2700 | int err = -ENOSPC; | |
4df27c4d | 2701 | int ret; |
33345d01 LZ |
2702 | u64 ino = btrfs_ino(inode); |
2703 | u64 dir_ino = btrfs_ino(dir); | |
4df27c4d | 2704 | |
e70bea5f JB |
2705 | /* |
2706 | * 1 for the possible orphan item | |
2707 | * 1 for the dir item | |
2708 | * 1 for the dir index | |
2709 | * 1 for the inode ref | |
2710 | * 1 for the inode ref in the tree log | |
2711 | * 2 for the dir entries in the log | |
2712 | * 1 for the inode | |
2713 | */ | |
2714 | trans = btrfs_start_transaction(root, 8); | |
a22285a6 YZ |
2715 | if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC) |
2716 | return trans; | |
4df27c4d | 2717 | |
33345d01 | 2718 | if (ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
a22285a6 | 2719 | return ERR_PTR(-ENOSPC); |
4df27c4d | 2720 | |
a22285a6 YZ |
2721 | /* check if there is someone else holds reference */ |
2722 | if (S_ISDIR(inode->i_mode) && atomic_read(&inode->i_count) > 1) | |
2723 | return ERR_PTR(-ENOSPC); | |
4df27c4d | 2724 | |
a22285a6 YZ |
2725 | if (atomic_read(&inode->i_count) > 2) |
2726 | return ERR_PTR(-ENOSPC); | |
4df27c4d | 2727 | |
a22285a6 YZ |
2728 | if (xchg(&root->fs_info->enospc_unlink, 1)) |
2729 | return ERR_PTR(-ENOSPC); | |
2730 | ||
2731 | path = btrfs_alloc_path(); | |
2732 | if (!path) { | |
2733 | root->fs_info->enospc_unlink = 0; | |
2734 | return ERR_PTR(-ENOMEM); | |
4df27c4d YZ |
2735 | } |
2736 | ||
3880a1b4 JB |
2737 | /* 1 for the orphan item */ |
2738 | trans = btrfs_start_transaction(root, 1); | |
5df6a9f6 | 2739 | if (IS_ERR(trans)) { |
a22285a6 YZ |
2740 | btrfs_free_path(path); |
2741 | root->fs_info->enospc_unlink = 0; | |
2742 | return trans; | |
2743 | } | |
4df27c4d | 2744 | |
a22285a6 YZ |
2745 | path->skip_locking = 1; |
2746 | path->search_commit_root = 1; | |
4df27c4d | 2747 | |
a22285a6 YZ |
2748 | ret = btrfs_lookup_inode(trans, root, path, |
2749 | &BTRFS_I(dir)->location, 0); | |
2750 | if (ret < 0) { | |
2751 | err = ret; | |
2752 | goto out; | |
2753 | } | |
2754 | if (ret == 0) { | |
2755 | if (check_path_shared(root, path)) | |
2756 | goto out; | |
2757 | } else { | |
2758 | check_link = 0; | |
5df6a9f6 | 2759 | } |
b3b4aa74 | 2760 | btrfs_release_path(path); |
a22285a6 YZ |
2761 | |
2762 | ret = btrfs_lookup_inode(trans, root, path, | |
2763 | &BTRFS_I(inode)->location, 0); | |
2764 | if (ret < 0) { | |
2765 | err = ret; | |
2766 | goto out; | |
2767 | } | |
2768 | if (ret == 0) { | |
2769 | if (check_path_shared(root, path)) | |
2770 | goto out; | |
2771 | } else { | |
2772 | check_link = 0; | |
2773 | } | |
b3b4aa74 | 2774 | btrfs_release_path(path); |
a22285a6 YZ |
2775 | |
2776 | if (ret == 0 && S_ISREG(inode->i_mode)) { | |
2777 | ret = btrfs_lookup_file_extent(trans, root, path, | |
33345d01 | 2778 | ino, (u64)-1, 0); |
a22285a6 YZ |
2779 | if (ret < 0) { |
2780 | err = ret; | |
2781 | goto out; | |
2782 | } | |
2783 | BUG_ON(ret == 0); | |
2784 | if (check_path_shared(root, path)) | |
2785 | goto out; | |
b3b4aa74 | 2786 | btrfs_release_path(path); |
a22285a6 YZ |
2787 | } |
2788 | ||
2789 | if (!check_link) { | |
2790 | err = 0; | |
2791 | goto out; | |
2792 | } | |
2793 | ||
33345d01 | 2794 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
a22285a6 YZ |
2795 | dentry->d_name.name, dentry->d_name.len, 0); |
2796 | if (IS_ERR(di)) { | |
2797 | err = PTR_ERR(di); | |
2798 | goto out; | |
2799 | } | |
2800 | if (di) { | |
2801 | if (check_path_shared(root, path)) | |
2802 | goto out; | |
2803 | } else { | |
2804 | err = 0; | |
2805 | goto out; | |
2806 | } | |
b3b4aa74 | 2807 | btrfs_release_path(path); |
a22285a6 YZ |
2808 | |
2809 | ref = btrfs_lookup_inode_ref(trans, root, path, | |
2810 | dentry->d_name.name, dentry->d_name.len, | |
33345d01 | 2811 | ino, dir_ino, 0); |
a22285a6 YZ |
2812 | if (IS_ERR(ref)) { |
2813 | err = PTR_ERR(ref); | |
2814 | goto out; | |
2815 | } | |
2816 | BUG_ON(!ref); | |
2817 | if (check_path_shared(root, path)) | |
2818 | goto out; | |
2819 | index = btrfs_inode_ref_index(path->nodes[0], ref); | |
b3b4aa74 | 2820 | btrfs_release_path(path); |
a22285a6 | 2821 | |
16cdcec7 MX |
2822 | /* |
2823 | * This is a commit root search, if we can lookup inode item and other | |
2824 | * relative items in the commit root, it means the transaction of | |
2825 | * dir/file creation has been committed, and the dir index item that we | |
2826 | * delay to insert has also been inserted into the commit root. So | |
2827 | * we needn't worry about the delayed insertion of the dir index item | |
2828 | * here. | |
2829 | */ | |
33345d01 | 2830 | di = btrfs_lookup_dir_index_item(trans, root, path, dir_ino, index, |
a22285a6 YZ |
2831 | dentry->d_name.name, dentry->d_name.len, 0); |
2832 | if (IS_ERR(di)) { | |
2833 | err = PTR_ERR(di); | |
2834 | goto out; | |
2835 | } | |
2836 | BUG_ON(ret == -ENOENT); | |
2837 | if (check_path_shared(root, path)) | |
2838 | goto out; | |
2839 | ||
2840 | err = 0; | |
2841 | out: | |
2842 | btrfs_free_path(path); | |
3880a1b4 JB |
2843 | /* Migrate the orphan reservation over */ |
2844 | if (!err) | |
2845 | err = btrfs_block_rsv_migrate(trans->block_rsv, | |
2846 | &root->fs_info->global_block_rsv, | |
5a77d76c | 2847 | trans->bytes_reserved); |
3880a1b4 | 2848 | |
a22285a6 YZ |
2849 | if (err) { |
2850 | btrfs_end_transaction(trans, root); | |
2851 | root->fs_info->enospc_unlink = 0; | |
2852 | return ERR_PTR(err); | |
2853 | } | |
2854 | ||
2855 | trans->block_rsv = &root->fs_info->global_block_rsv; | |
2856 | return trans; | |
2857 | } | |
2858 | ||
2859 | static void __unlink_end_trans(struct btrfs_trans_handle *trans, | |
2860 | struct btrfs_root *root) | |
2861 | { | |
2862 | if (trans->block_rsv == &root->fs_info->global_block_rsv) { | |
5a77d76c JB |
2863 | btrfs_block_rsv_release(root, trans->block_rsv, |
2864 | trans->bytes_reserved); | |
2865 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
a22285a6 YZ |
2866 | BUG_ON(!root->fs_info->enospc_unlink); |
2867 | root->fs_info->enospc_unlink = 0; | |
2868 | } | |
7ad85bb7 | 2869 | btrfs_end_transaction(trans, root); |
a22285a6 YZ |
2870 | } |
2871 | ||
2872 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
2873 | { | |
2874 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2875 | struct btrfs_trans_handle *trans; | |
2876 | struct inode *inode = dentry->d_inode; | |
2877 | int ret; | |
2878 | unsigned long nr = 0; | |
2879 | ||
2880 | trans = __unlink_start_trans(dir, dentry); | |
2881 | if (IS_ERR(trans)) | |
2882 | return PTR_ERR(trans); | |
5f39d397 | 2883 | |
12fcfd22 CM |
2884 | btrfs_record_unlink_dir(trans, dir, dentry->d_inode, 0); |
2885 | ||
e02119d5 CM |
2886 | ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
2887 | dentry->d_name.name, dentry->d_name.len); | |
b532402e TI |
2888 | if (ret) |
2889 | goto out; | |
7b128766 | 2890 | |
a22285a6 | 2891 | if (inode->i_nlink == 0) { |
7b128766 | 2892 | ret = btrfs_orphan_add(trans, inode); |
b532402e TI |
2893 | if (ret) |
2894 | goto out; | |
a22285a6 | 2895 | } |
7b128766 | 2896 | |
b532402e | 2897 | out: |
d3c2fdcf | 2898 | nr = trans->blocks_used; |
a22285a6 | 2899 | __unlink_end_trans(trans, root); |
d3c2fdcf | 2900 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2901 | return ret; |
2902 | } | |
2903 | ||
4df27c4d YZ |
2904 | int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, |
2905 | struct btrfs_root *root, | |
2906 | struct inode *dir, u64 objectid, | |
2907 | const char *name, int name_len) | |
2908 | { | |
2909 | struct btrfs_path *path; | |
2910 | struct extent_buffer *leaf; | |
2911 | struct btrfs_dir_item *di; | |
2912 | struct btrfs_key key; | |
2913 | u64 index; | |
2914 | int ret; | |
33345d01 | 2915 | u64 dir_ino = btrfs_ino(dir); |
4df27c4d YZ |
2916 | |
2917 | path = btrfs_alloc_path(); | |
2918 | if (!path) | |
2919 | return -ENOMEM; | |
2920 | ||
33345d01 | 2921 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
4df27c4d | 2922 | name, name_len, -1); |
c704005d | 2923 | BUG_ON(IS_ERR_OR_NULL(di)); |
4df27c4d YZ |
2924 | |
2925 | leaf = path->nodes[0]; | |
2926 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
2927 | WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid); | |
2928 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
2929 | BUG_ON(ret); | |
b3b4aa74 | 2930 | btrfs_release_path(path); |
4df27c4d YZ |
2931 | |
2932 | ret = btrfs_del_root_ref(trans, root->fs_info->tree_root, | |
2933 | objectid, root->root_key.objectid, | |
33345d01 | 2934 | dir_ino, &index, name, name_len); |
4df27c4d YZ |
2935 | if (ret < 0) { |
2936 | BUG_ON(ret != -ENOENT); | |
33345d01 | 2937 | di = btrfs_search_dir_index_item(root, path, dir_ino, |
4df27c4d | 2938 | name, name_len); |
c704005d | 2939 | BUG_ON(IS_ERR_OR_NULL(di)); |
4df27c4d YZ |
2940 | |
2941 | leaf = path->nodes[0]; | |
2942 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 2943 | btrfs_release_path(path); |
4df27c4d YZ |
2944 | index = key.offset; |
2945 | } | |
945d8962 | 2946 | btrfs_release_path(path); |
4df27c4d | 2947 | |
16cdcec7 | 2948 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
4df27c4d | 2949 | BUG_ON(ret); |
4df27c4d YZ |
2950 | |
2951 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
2952 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
2953 | ret = btrfs_update_inode(trans, root, dir); | |
2954 | BUG_ON(ret); | |
4df27c4d | 2955 | |
71d7aed0 | 2956 | btrfs_free_path(path); |
4df27c4d YZ |
2957 | return 0; |
2958 | } | |
2959 | ||
39279cc3 CM |
2960 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) |
2961 | { | |
2962 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 2963 | int err = 0; |
39279cc3 | 2964 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 | 2965 | struct btrfs_trans_handle *trans; |
1832a6d5 | 2966 | unsigned long nr = 0; |
39279cc3 | 2967 | |
3394e160 | 2968 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE || |
33345d01 | 2969 | btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID) |
134d4512 Y |
2970 | return -ENOTEMPTY; |
2971 | ||
a22285a6 YZ |
2972 | trans = __unlink_start_trans(dir, dentry); |
2973 | if (IS_ERR(trans)) | |
5df6a9f6 | 2974 | return PTR_ERR(trans); |
5df6a9f6 | 2975 | |
33345d01 | 2976 | if (unlikely(btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
4df27c4d YZ |
2977 | err = btrfs_unlink_subvol(trans, root, dir, |
2978 | BTRFS_I(inode)->location.objectid, | |
2979 | dentry->d_name.name, | |
2980 | dentry->d_name.len); | |
2981 | goto out; | |
2982 | } | |
2983 | ||
7b128766 JB |
2984 | err = btrfs_orphan_add(trans, inode); |
2985 | if (err) | |
4df27c4d | 2986 | goto out; |
7b128766 | 2987 | |
39279cc3 | 2988 | /* now the directory is empty */ |
e02119d5 CM |
2989 | err = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
2990 | dentry->d_name.name, dentry->d_name.len); | |
d397712b | 2991 | if (!err) |
dbe674a9 | 2992 | btrfs_i_size_write(inode, 0); |
4df27c4d | 2993 | out: |
d3c2fdcf | 2994 | nr = trans->blocks_used; |
a22285a6 | 2995 | __unlink_end_trans(trans, root); |
d3c2fdcf | 2996 | btrfs_btree_balance_dirty(root, nr); |
3954401f | 2997 | |
39279cc3 CM |
2998 | return err; |
2999 | } | |
3000 | ||
39279cc3 CM |
3001 | /* |
3002 | * this can truncate away extent items, csum items and directory items. | |
3003 | * It starts at a high offset and removes keys until it can't find | |
d352ac68 | 3004 | * any higher than new_size |
39279cc3 CM |
3005 | * |
3006 | * csum items that cross the new i_size are truncated to the new size | |
3007 | * as well. | |
7b128766 JB |
3008 | * |
3009 | * min_type is the minimum key type to truncate down to. If set to 0, this | |
3010 | * will kill all the items on this inode, including the INODE_ITEM_KEY. | |
39279cc3 | 3011 | */ |
8082510e YZ |
3012 | int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, |
3013 | struct btrfs_root *root, | |
3014 | struct inode *inode, | |
3015 | u64 new_size, u32 min_type) | |
39279cc3 | 3016 | { |
39279cc3 | 3017 | struct btrfs_path *path; |
5f39d397 | 3018 | struct extent_buffer *leaf; |
39279cc3 | 3019 | struct btrfs_file_extent_item *fi; |
8082510e YZ |
3020 | struct btrfs_key key; |
3021 | struct btrfs_key found_key; | |
39279cc3 | 3022 | u64 extent_start = 0; |
db94535d | 3023 | u64 extent_num_bytes = 0; |
5d4f98a2 | 3024 | u64 extent_offset = 0; |
39279cc3 | 3025 | u64 item_end = 0; |
8082510e YZ |
3026 | u64 mask = root->sectorsize - 1; |
3027 | u32 found_type = (u8)-1; | |
39279cc3 CM |
3028 | int found_extent; |
3029 | int del_item; | |
85e21bac CM |
3030 | int pending_del_nr = 0; |
3031 | int pending_del_slot = 0; | |
179e29e4 | 3032 | int extent_type = -1; |
8082510e YZ |
3033 | int ret; |
3034 | int err = 0; | |
33345d01 | 3035 | u64 ino = btrfs_ino(inode); |
8082510e YZ |
3036 | |
3037 | BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 3038 | |
0eb0e19c MF |
3039 | path = btrfs_alloc_path(); |
3040 | if (!path) | |
3041 | return -ENOMEM; | |
3042 | path->reada = -1; | |
3043 | ||
0af3d00b | 3044 | if (root->ref_cows || root == root->fs_info->tree_root) |
5b21f2ed | 3045 | btrfs_drop_extent_cache(inode, new_size & (~mask), (u64)-1, 0); |
8082510e | 3046 | |
16cdcec7 MX |
3047 | /* |
3048 | * This function is also used to drop the items in the log tree before | |
3049 | * we relog the inode, so if root != BTRFS_I(inode)->root, it means | |
3050 | * it is used to drop the loged items. So we shouldn't kill the delayed | |
3051 | * items. | |
3052 | */ | |
3053 | if (min_type == 0 && root == BTRFS_I(inode)->root) | |
3054 | btrfs_kill_delayed_inode_items(inode); | |
3055 | ||
33345d01 | 3056 | key.objectid = ino; |
39279cc3 | 3057 | key.offset = (u64)-1; |
5f39d397 CM |
3058 | key.type = (u8)-1; |
3059 | ||
85e21bac | 3060 | search_again: |
b9473439 | 3061 | path->leave_spinning = 1; |
85e21bac | 3062 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
8082510e YZ |
3063 | if (ret < 0) { |
3064 | err = ret; | |
3065 | goto out; | |
3066 | } | |
d397712b | 3067 | |
85e21bac | 3068 | if (ret > 0) { |
e02119d5 CM |
3069 | /* there are no items in the tree for us to truncate, we're |
3070 | * done | |
3071 | */ | |
8082510e YZ |
3072 | if (path->slots[0] == 0) |
3073 | goto out; | |
85e21bac CM |
3074 | path->slots[0]--; |
3075 | } | |
3076 | ||
d397712b | 3077 | while (1) { |
39279cc3 | 3078 | fi = NULL; |
5f39d397 CM |
3079 | leaf = path->nodes[0]; |
3080 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
3081 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 3082 | |
33345d01 | 3083 | if (found_key.objectid != ino) |
39279cc3 | 3084 | break; |
5f39d397 | 3085 | |
85e21bac | 3086 | if (found_type < min_type) |
39279cc3 CM |
3087 | break; |
3088 | ||
5f39d397 | 3089 | item_end = found_key.offset; |
39279cc3 | 3090 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 3091 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 3092 | struct btrfs_file_extent_item); |
179e29e4 CM |
3093 | extent_type = btrfs_file_extent_type(leaf, fi); |
3094 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 3095 | item_end += |
db94535d | 3096 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 | 3097 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
179e29e4 | 3098 | item_end += btrfs_file_extent_inline_len(leaf, |
c8b97818 | 3099 | fi); |
39279cc3 | 3100 | } |
008630c1 | 3101 | item_end--; |
39279cc3 | 3102 | } |
8082510e YZ |
3103 | if (found_type > min_type) { |
3104 | del_item = 1; | |
3105 | } else { | |
3106 | if (item_end < new_size) | |
b888db2b | 3107 | break; |
8082510e YZ |
3108 | if (found_key.offset >= new_size) |
3109 | del_item = 1; | |
3110 | else | |
3111 | del_item = 0; | |
39279cc3 | 3112 | } |
39279cc3 | 3113 | found_extent = 0; |
39279cc3 | 3114 | /* FIXME, shrink the extent if the ref count is only 1 */ |
179e29e4 CM |
3115 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
3116 | goto delete; | |
3117 | ||
3118 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 3119 | u64 num_dec; |
db94535d | 3120 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
f70a9a6b | 3121 | if (!del_item) { |
db94535d CM |
3122 | u64 orig_num_bytes = |
3123 | btrfs_file_extent_num_bytes(leaf, fi); | |
e02119d5 | 3124 | extent_num_bytes = new_size - |
5f39d397 | 3125 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
3126 | extent_num_bytes = extent_num_bytes & |
3127 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
3128 | btrfs_set_file_extent_num_bytes(leaf, fi, |
3129 | extent_num_bytes); | |
3130 | num_dec = (orig_num_bytes - | |
9069218d | 3131 | extent_num_bytes); |
e02119d5 | 3132 | if (root->ref_cows && extent_start != 0) |
a76a3cd4 | 3133 | inode_sub_bytes(inode, num_dec); |
5f39d397 | 3134 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 3135 | } else { |
db94535d CM |
3136 | extent_num_bytes = |
3137 | btrfs_file_extent_disk_num_bytes(leaf, | |
3138 | fi); | |
5d4f98a2 YZ |
3139 | extent_offset = found_key.offset - |
3140 | btrfs_file_extent_offset(leaf, fi); | |
3141 | ||
39279cc3 | 3142 | /* FIXME blocksize != 4096 */ |
9069218d | 3143 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
3144 | if (extent_start != 0) { |
3145 | found_extent = 1; | |
e02119d5 | 3146 | if (root->ref_cows) |
a76a3cd4 | 3147 | inode_sub_bytes(inode, num_dec); |
e02119d5 | 3148 | } |
39279cc3 | 3149 | } |
9069218d | 3150 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
c8b97818 CM |
3151 | /* |
3152 | * we can't truncate inline items that have had | |
3153 | * special encodings | |
3154 | */ | |
3155 | if (!del_item && | |
3156 | btrfs_file_extent_compression(leaf, fi) == 0 && | |
3157 | btrfs_file_extent_encryption(leaf, fi) == 0 && | |
3158 | btrfs_file_extent_other_encoding(leaf, fi) == 0) { | |
e02119d5 CM |
3159 | u32 size = new_size - found_key.offset; |
3160 | ||
3161 | if (root->ref_cows) { | |
a76a3cd4 YZ |
3162 | inode_sub_bytes(inode, item_end + 1 - |
3163 | new_size); | |
e02119d5 CM |
3164 | } |
3165 | size = | |
3166 | btrfs_file_extent_calc_inline_size(size); | |
9069218d | 3167 | ret = btrfs_truncate_item(trans, root, path, |
e02119d5 | 3168 | size, 1); |
e02119d5 | 3169 | } else if (root->ref_cows) { |
a76a3cd4 YZ |
3170 | inode_sub_bytes(inode, item_end + 1 - |
3171 | found_key.offset); | |
9069218d | 3172 | } |
39279cc3 | 3173 | } |
179e29e4 | 3174 | delete: |
39279cc3 | 3175 | if (del_item) { |
85e21bac CM |
3176 | if (!pending_del_nr) { |
3177 | /* no pending yet, add ourselves */ | |
3178 | pending_del_slot = path->slots[0]; | |
3179 | pending_del_nr = 1; | |
3180 | } else if (pending_del_nr && | |
3181 | path->slots[0] + 1 == pending_del_slot) { | |
3182 | /* hop on the pending chunk */ | |
3183 | pending_del_nr++; | |
3184 | pending_del_slot = path->slots[0]; | |
3185 | } else { | |
d397712b | 3186 | BUG(); |
85e21bac | 3187 | } |
39279cc3 CM |
3188 | } else { |
3189 | break; | |
3190 | } | |
0af3d00b JB |
3191 | if (found_extent && (root->ref_cows || |
3192 | root == root->fs_info->tree_root)) { | |
b9473439 | 3193 | btrfs_set_path_blocking(path); |
39279cc3 | 3194 | ret = btrfs_free_extent(trans, root, extent_start, |
5d4f98a2 YZ |
3195 | extent_num_bytes, 0, |
3196 | btrfs_header_owner(leaf), | |
66d7e7f0 | 3197 | ino, extent_offset, 0); |
39279cc3 CM |
3198 | BUG_ON(ret); |
3199 | } | |
85e21bac | 3200 | |
8082510e YZ |
3201 | if (found_type == BTRFS_INODE_ITEM_KEY) |
3202 | break; | |
3203 | ||
3204 | if (path->slots[0] == 0 || | |
3205 | path->slots[0] != pending_del_slot) { | |
82d5902d LZ |
3206 | if (root->ref_cows && |
3207 | BTRFS_I(inode)->location.objectid != | |
3208 | BTRFS_FREE_INO_OBJECTID) { | |
8082510e YZ |
3209 | err = -EAGAIN; |
3210 | goto out; | |
3211 | } | |
3212 | if (pending_del_nr) { | |
3213 | ret = btrfs_del_items(trans, root, path, | |
3214 | pending_del_slot, | |
3215 | pending_del_nr); | |
3216 | BUG_ON(ret); | |
3217 | pending_del_nr = 0; | |
3218 | } | |
b3b4aa74 | 3219 | btrfs_release_path(path); |
85e21bac | 3220 | goto search_again; |
8082510e YZ |
3221 | } else { |
3222 | path->slots[0]--; | |
85e21bac | 3223 | } |
39279cc3 | 3224 | } |
8082510e | 3225 | out: |
85e21bac CM |
3226 | if (pending_del_nr) { |
3227 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
3228 | pending_del_nr); | |
d68fc57b | 3229 | BUG_ON(ret); |
85e21bac | 3230 | } |
39279cc3 | 3231 | btrfs_free_path(path); |
8082510e | 3232 | return err; |
39279cc3 CM |
3233 | } |
3234 | ||
3235 | /* | |
3236 | * taken from block_truncate_page, but does cow as it zeros out | |
3237 | * any bytes left in the last page in the file. | |
3238 | */ | |
3239 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
3240 | { | |
3241 | struct inode *inode = mapping->host; | |
db94535d | 3242 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
3243 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
3244 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 3245 | struct extent_state *cached_state = NULL; |
e6dcd2dc | 3246 | char *kaddr; |
db94535d | 3247 | u32 blocksize = root->sectorsize; |
39279cc3 CM |
3248 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
3249 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
3250 | struct page *page; | |
3b16a4e3 | 3251 | gfp_t mask = btrfs_alloc_write_mask(mapping); |
39279cc3 | 3252 | int ret = 0; |
a52d9a80 | 3253 | u64 page_start; |
e6dcd2dc | 3254 | u64 page_end; |
39279cc3 CM |
3255 | |
3256 | if ((offset & (blocksize - 1)) == 0) | |
3257 | goto out; | |
0ca1f7ce | 3258 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
5d5e103a JB |
3259 | if (ret) |
3260 | goto out; | |
39279cc3 CM |
3261 | |
3262 | ret = -ENOMEM; | |
211c17f5 | 3263 | again: |
3b16a4e3 | 3264 | page = find_or_create_page(mapping, index, mask); |
5d5e103a | 3265 | if (!page) { |
0ca1f7ce | 3266 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
39279cc3 | 3267 | goto out; |
5d5e103a | 3268 | } |
e6dcd2dc CM |
3269 | |
3270 | page_start = page_offset(page); | |
3271 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
3272 | ||
39279cc3 | 3273 | if (!PageUptodate(page)) { |
9ebefb18 | 3274 | ret = btrfs_readpage(NULL, page); |
39279cc3 | 3275 | lock_page(page); |
211c17f5 CM |
3276 | if (page->mapping != mapping) { |
3277 | unlock_page(page); | |
3278 | page_cache_release(page); | |
3279 | goto again; | |
3280 | } | |
39279cc3 CM |
3281 | if (!PageUptodate(page)) { |
3282 | ret = -EIO; | |
89642229 | 3283 | goto out_unlock; |
39279cc3 CM |
3284 | } |
3285 | } | |
211c17f5 | 3286 | wait_on_page_writeback(page); |
e6dcd2dc | 3287 | |
2ac55d41 JB |
3288 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state, |
3289 | GFP_NOFS); | |
e6dcd2dc CM |
3290 | set_page_extent_mapped(page); |
3291 | ||
3292 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
3293 | if (ordered) { | |
2ac55d41 JB |
3294 | unlock_extent_cached(io_tree, page_start, page_end, |
3295 | &cached_state, GFP_NOFS); | |
e6dcd2dc CM |
3296 | unlock_page(page); |
3297 | page_cache_release(page); | |
eb84ae03 | 3298 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
3299 | btrfs_put_ordered_extent(ordered); |
3300 | goto again; | |
3301 | } | |
3302 | ||
2ac55d41 | 3303 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
5d5e103a | 3304 | EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING, |
2ac55d41 | 3305 | 0, 0, &cached_state, GFP_NOFS); |
5d5e103a | 3306 | |
2ac55d41 JB |
3307 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
3308 | &cached_state); | |
9ed74f2d | 3309 | if (ret) { |
2ac55d41 JB |
3310 | unlock_extent_cached(io_tree, page_start, page_end, |
3311 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
3312 | goto out_unlock; |
3313 | } | |
3314 | ||
e6dcd2dc CM |
3315 | ret = 0; |
3316 | if (offset != PAGE_CACHE_SIZE) { | |
3317 | kaddr = kmap(page); | |
3318 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
3319 | flush_dcache_page(page); | |
3320 | kunmap(page); | |
3321 | } | |
247e743c | 3322 | ClearPageChecked(page); |
e6dcd2dc | 3323 | set_page_dirty(page); |
2ac55d41 JB |
3324 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, |
3325 | GFP_NOFS); | |
39279cc3 | 3326 | |
89642229 | 3327 | out_unlock: |
5d5e103a | 3328 | if (ret) |
0ca1f7ce | 3329 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
39279cc3 CM |
3330 | unlock_page(page); |
3331 | page_cache_release(page); | |
3332 | out: | |
3333 | return ret; | |
3334 | } | |
3335 | ||
695a0d0d JB |
3336 | /* |
3337 | * This function puts in dummy file extents for the area we're creating a hole | |
3338 | * for. So if we are truncating this file to a larger size we need to insert | |
3339 | * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for | |
3340 | * the range between oldsize and size | |
3341 | */ | |
a41ad394 | 3342 | int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size) |
39279cc3 | 3343 | { |
9036c102 YZ |
3344 | struct btrfs_trans_handle *trans; |
3345 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3346 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
a22285a6 | 3347 | struct extent_map *em = NULL; |
2ac55d41 | 3348 | struct extent_state *cached_state = NULL; |
9036c102 | 3349 | u64 mask = root->sectorsize - 1; |
a41ad394 | 3350 | u64 hole_start = (oldsize + mask) & ~mask; |
9036c102 YZ |
3351 | u64 block_end = (size + mask) & ~mask; |
3352 | u64 last_byte; | |
3353 | u64 cur_offset; | |
3354 | u64 hole_size; | |
9ed74f2d | 3355 | int err = 0; |
39279cc3 | 3356 | |
9036c102 YZ |
3357 | if (size <= hole_start) |
3358 | return 0; | |
3359 | ||
9036c102 YZ |
3360 | while (1) { |
3361 | struct btrfs_ordered_extent *ordered; | |
3362 | btrfs_wait_ordered_range(inode, hole_start, | |
3363 | block_end - hole_start); | |
2ac55d41 JB |
3364 | lock_extent_bits(io_tree, hole_start, block_end - 1, 0, |
3365 | &cached_state, GFP_NOFS); | |
9036c102 YZ |
3366 | ordered = btrfs_lookup_ordered_extent(inode, hole_start); |
3367 | if (!ordered) | |
3368 | break; | |
2ac55d41 JB |
3369 | unlock_extent_cached(io_tree, hole_start, block_end - 1, |
3370 | &cached_state, GFP_NOFS); | |
9036c102 YZ |
3371 | btrfs_put_ordered_extent(ordered); |
3372 | } | |
39279cc3 | 3373 | |
9036c102 YZ |
3374 | cur_offset = hole_start; |
3375 | while (1) { | |
3376 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, | |
3377 | block_end - cur_offset, 0); | |
c704005d | 3378 | BUG_ON(IS_ERR_OR_NULL(em)); |
9036c102 YZ |
3379 | last_byte = min(extent_map_end(em), block_end); |
3380 | last_byte = (last_byte + mask) & ~mask; | |
8082510e | 3381 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { |
771ed689 | 3382 | u64 hint_byte = 0; |
9036c102 | 3383 | hole_size = last_byte - cur_offset; |
9ed74f2d | 3384 | |
3642320e | 3385 | trans = btrfs_start_transaction(root, 3); |
a22285a6 YZ |
3386 | if (IS_ERR(trans)) { |
3387 | err = PTR_ERR(trans); | |
9ed74f2d | 3388 | break; |
a22285a6 | 3389 | } |
8082510e YZ |
3390 | |
3391 | err = btrfs_drop_extents(trans, inode, cur_offset, | |
3392 | cur_offset + hole_size, | |
3393 | &hint_byte, 1); | |
5b397377 | 3394 | if (err) { |
3642320e | 3395 | btrfs_update_inode(trans, root, inode); |
5b397377 | 3396 | btrfs_end_transaction(trans, root); |
3893e33b | 3397 | break; |
5b397377 | 3398 | } |
8082510e | 3399 | |
9036c102 | 3400 | err = btrfs_insert_file_extent(trans, root, |
33345d01 | 3401 | btrfs_ino(inode), cur_offset, 0, |
9036c102 YZ |
3402 | 0, hole_size, 0, hole_size, |
3403 | 0, 0, 0); | |
5b397377 | 3404 | if (err) { |
3642320e | 3405 | btrfs_update_inode(trans, root, inode); |
5b397377 | 3406 | btrfs_end_transaction(trans, root); |
3893e33b | 3407 | break; |
5b397377 | 3408 | } |
8082510e | 3409 | |
9036c102 YZ |
3410 | btrfs_drop_extent_cache(inode, hole_start, |
3411 | last_byte - 1, 0); | |
8082510e | 3412 | |
3642320e | 3413 | btrfs_update_inode(trans, root, inode); |
8082510e | 3414 | btrfs_end_transaction(trans, root); |
9036c102 YZ |
3415 | } |
3416 | free_extent_map(em); | |
a22285a6 | 3417 | em = NULL; |
9036c102 | 3418 | cur_offset = last_byte; |
8082510e | 3419 | if (cur_offset >= block_end) |
9036c102 YZ |
3420 | break; |
3421 | } | |
1832a6d5 | 3422 | |
a22285a6 | 3423 | free_extent_map(em); |
2ac55d41 JB |
3424 | unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state, |
3425 | GFP_NOFS); | |
9036c102 YZ |
3426 | return err; |
3427 | } | |
39279cc3 | 3428 | |
a41ad394 | 3429 | static int btrfs_setsize(struct inode *inode, loff_t newsize) |
8082510e | 3430 | { |
f4a2f4c5 MX |
3431 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3432 | struct btrfs_trans_handle *trans; | |
a41ad394 | 3433 | loff_t oldsize = i_size_read(inode); |
8082510e YZ |
3434 | int ret; |
3435 | ||
a41ad394 | 3436 | if (newsize == oldsize) |
8082510e YZ |
3437 | return 0; |
3438 | ||
a41ad394 | 3439 | if (newsize > oldsize) { |
a41ad394 JB |
3440 | truncate_pagecache(inode, oldsize, newsize); |
3441 | ret = btrfs_cont_expand(inode, oldsize, newsize); | |
f4a2f4c5 | 3442 | if (ret) |
8082510e | 3443 | return ret; |
8082510e | 3444 | |
f4a2f4c5 MX |
3445 | trans = btrfs_start_transaction(root, 1); |
3446 | if (IS_ERR(trans)) | |
3447 | return PTR_ERR(trans); | |
3448 | ||
3449 | i_size_write(inode, newsize); | |
3450 | btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL); | |
3451 | ret = btrfs_update_inode(trans, root, inode); | |
7ad85bb7 | 3452 | btrfs_end_transaction(trans, root); |
a41ad394 | 3453 | } else { |
8082510e | 3454 | |
a41ad394 JB |
3455 | /* |
3456 | * We're truncating a file that used to have good data down to | |
3457 | * zero. Make sure it gets into the ordered flush list so that | |
3458 | * any new writes get down to disk quickly. | |
3459 | */ | |
3460 | if (newsize == 0) | |
3461 | BTRFS_I(inode)->ordered_data_close = 1; | |
8082510e | 3462 | |
a41ad394 JB |
3463 | /* we don't support swapfiles, so vmtruncate shouldn't fail */ |
3464 | truncate_setsize(inode, newsize); | |
3465 | ret = btrfs_truncate(inode); | |
8082510e YZ |
3466 | } |
3467 | ||
a41ad394 | 3468 | return ret; |
8082510e YZ |
3469 | } |
3470 | ||
9036c102 YZ |
3471 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
3472 | { | |
3473 | struct inode *inode = dentry->d_inode; | |
b83cc969 | 3474 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9036c102 | 3475 | int err; |
39279cc3 | 3476 | |
b83cc969 LZ |
3477 | if (btrfs_root_readonly(root)) |
3478 | return -EROFS; | |
3479 | ||
9036c102 YZ |
3480 | err = inode_change_ok(inode, attr); |
3481 | if (err) | |
3482 | return err; | |
2bf5a725 | 3483 | |
5a3f23d5 | 3484 | if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) { |
a41ad394 | 3485 | err = btrfs_setsize(inode, attr->ia_size); |
8082510e YZ |
3486 | if (err) |
3487 | return err; | |
39279cc3 | 3488 | } |
9036c102 | 3489 | |
1025774c CH |
3490 | if (attr->ia_valid) { |
3491 | setattr_copy(inode, attr); | |
22c44fe6 | 3492 | err = btrfs_dirty_inode(inode); |
1025774c | 3493 | |
22c44fe6 | 3494 | if (!err && attr->ia_valid & ATTR_MODE) |
1025774c CH |
3495 | err = btrfs_acl_chmod(inode); |
3496 | } | |
33268eaf | 3497 | |
39279cc3 CM |
3498 | return err; |
3499 | } | |
61295eb8 | 3500 | |
bd555975 | 3501 | void btrfs_evict_inode(struct inode *inode) |
39279cc3 CM |
3502 | { |
3503 | struct btrfs_trans_handle *trans; | |
3504 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
726c35fa | 3505 | struct btrfs_block_rsv *rsv, *global_rsv; |
07127184 | 3506 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
d3c2fdcf | 3507 | unsigned long nr; |
39279cc3 CM |
3508 | int ret; |
3509 | ||
1abe9b8a | 3510 | trace_btrfs_inode_evict(inode); |
3511 | ||
39279cc3 | 3512 | truncate_inode_pages(&inode->i_data, 0); |
0af3d00b | 3513 | if (inode->i_nlink && (btrfs_root_refs(&root->root_item) != 0 || |
2cf8572d | 3514 | btrfs_is_free_space_inode(root, inode))) |
bd555975 AV |
3515 | goto no_delete; |
3516 | ||
39279cc3 | 3517 | if (is_bad_inode(inode)) { |
7b128766 | 3518 | btrfs_orphan_del(NULL, inode); |
39279cc3 CM |
3519 | goto no_delete; |
3520 | } | |
bd555975 | 3521 | /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */ |
4a096752 | 3522 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
5f39d397 | 3523 | |
c71bf099 YZ |
3524 | if (root->fs_info->log_root_recovering) { |
3525 | BUG_ON(!list_empty(&BTRFS_I(inode)->i_orphan)); | |
3526 | goto no_delete; | |
3527 | } | |
3528 | ||
76dda93c YZ |
3529 | if (inode->i_nlink > 0) { |
3530 | BUG_ON(btrfs_root_refs(&root->root_item) != 0); | |
3531 | goto no_delete; | |
3532 | } | |
3533 | ||
4289a667 JB |
3534 | rsv = btrfs_alloc_block_rsv(root); |
3535 | if (!rsv) { | |
3536 | btrfs_orphan_del(NULL, inode); | |
3537 | goto no_delete; | |
3538 | } | |
4a338542 | 3539 | rsv->size = min_size; |
726c35fa | 3540 | global_rsv = &root->fs_info->global_block_rsv; |
4289a667 | 3541 | |
dbe674a9 | 3542 | btrfs_i_size_write(inode, 0); |
5f39d397 | 3543 | |
4289a667 JB |
3544 | /* |
3545 | * This is a bit simpler than btrfs_truncate since | |
3546 | * | |
3547 | * 1) We've already reserved our space for our orphan item in the | |
3548 | * unlink. | |
3549 | * 2) We're going to delete the inode item, so we don't need to update | |
3550 | * it at all. | |
3551 | * | |
3552 | * So we just need to reserve some slack space in case we add bytes when | |
3553 | * doing the truncate. | |
3554 | */ | |
8082510e | 3555 | while (1) { |
aa38a711 | 3556 | ret = btrfs_block_rsv_refill_noflush(root, rsv, min_size); |
726c35fa JB |
3557 | |
3558 | /* | |
3559 | * Try and steal from the global reserve since we will | |
3560 | * likely not use this space anyway, we want to try as | |
3561 | * hard as possible to get this to work. | |
3562 | */ | |
3563 | if (ret) | |
3564 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, min_size); | |
d68fc57b | 3565 | |
d68fc57b | 3566 | if (ret) { |
4289a667 | 3567 | printk(KERN_WARNING "Could not get space for a " |
482e6dc5 | 3568 | "delete, will truncate on mount %d\n", ret); |
4289a667 JB |
3569 | btrfs_orphan_del(NULL, inode); |
3570 | btrfs_free_block_rsv(root, rsv); | |
3571 | goto no_delete; | |
d68fc57b | 3572 | } |
7b128766 | 3573 | |
4289a667 JB |
3574 | trans = btrfs_start_transaction(root, 0); |
3575 | if (IS_ERR(trans)) { | |
3576 | btrfs_orphan_del(NULL, inode); | |
3577 | btrfs_free_block_rsv(root, rsv); | |
3578 | goto no_delete; | |
d68fc57b | 3579 | } |
7b128766 | 3580 | |
4289a667 JB |
3581 | trans->block_rsv = rsv; |
3582 | ||
d68fc57b | 3583 | ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0); |
8082510e YZ |
3584 | if (ret != -EAGAIN) |
3585 | break; | |
85e21bac | 3586 | |
8082510e YZ |
3587 | nr = trans->blocks_used; |
3588 | btrfs_end_transaction(trans, root); | |
3589 | trans = NULL; | |
3590 | btrfs_btree_balance_dirty(root, nr); | |
3591 | } | |
5f39d397 | 3592 | |
4289a667 JB |
3593 | btrfs_free_block_rsv(root, rsv); |
3594 | ||
8082510e | 3595 | if (ret == 0) { |
4289a667 | 3596 | trans->block_rsv = root->orphan_block_rsv; |
8082510e YZ |
3597 | ret = btrfs_orphan_del(trans, inode); |
3598 | BUG_ON(ret); | |
3599 | } | |
54aa1f4d | 3600 | |
4289a667 | 3601 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
581bb050 LZ |
3602 | if (!(root == root->fs_info->tree_root || |
3603 | root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID)) | |
33345d01 | 3604 | btrfs_return_ino(root, btrfs_ino(inode)); |
581bb050 | 3605 | |
d3c2fdcf | 3606 | nr = trans->blocks_used; |
54aa1f4d | 3607 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 3608 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 3609 | no_delete: |
bd555975 | 3610 | end_writeback(inode); |
8082510e | 3611 | return; |
39279cc3 CM |
3612 | } |
3613 | ||
3614 | /* | |
3615 | * this returns the key found in the dir entry in the location pointer. | |
3616 | * If no dir entries were found, location->objectid is 0. | |
3617 | */ | |
3618 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
3619 | struct btrfs_key *location) | |
3620 | { | |
3621 | const char *name = dentry->d_name.name; | |
3622 | int namelen = dentry->d_name.len; | |
3623 | struct btrfs_dir_item *di; | |
3624 | struct btrfs_path *path; | |
3625 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 3626 | int ret = 0; |
39279cc3 CM |
3627 | |
3628 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
3629 | if (!path) |
3630 | return -ENOMEM; | |
3954401f | 3631 | |
33345d01 | 3632 | di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(dir), name, |
39279cc3 | 3633 | namelen, 0); |
0d9f7f3e Y |
3634 | if (IS_ERR(di)) |
3635 | ret = PTR_ERR(di); | |
d397712b | 3636 | |
c704005d | 3637 | if (IS_ERR_OR_NULL(di)) |
3954401f | 3638 | goto out_err; |
d397712b | 3639 | |
5f39d397 | 3640 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 3641 | out: |
39279cc3 CM |
3642 | btrfs_free_path(path); |
3643 | return ret; | |
3954401f CM |
3644 | out_err: |
3645 | location->objectid = 0; | |
3646 | goto out; | |
39279cc3 CM |
3647 | } |
3648 | ||
3649 | /* | |
3650 | * when we hit a tree root in a directory, the btrfs part of the inode | |
3651 | * needs to be changed to reflect the root directory of the tree root. This | |
3652 | * is kind of like crossing a mount point. | |
3653 | */ | |
3654 | static int fixup_tree_root_location(struct btrfs_root *root, | |
4df27c4d YZ |
3655 | struct inode *dir, |
3656 | struct dentry *dentry, | |
3657 | struct btrfs_key *location, | |
3658 | struct btrfs_root **sub_root) | |
39279cc3 | 3659 | { |
4df27c4d YZ |
3660 | struct btrfs_path *path; |
3661 | struct btrfs_root *new_root; | |
3662 | struct btrfs_root_ref *ref; | |
3663 | struct extent_buffer *leaf; | |
3664 | int ret; | |
3665 | int err = 0; | |
39279cc3 | 3666 | |
4df27c4d YZ |
3667 | path = btrfs_alloc_path(); |
3668 | if (!path) { | |
3669 | err = -ENOMEM; | |
3670 | goto out; | |
3671 | } | |
39279cc3 | 3672 | |
4df27c4d YZ |
3673 | err = -ENOENT; |
3674 | ret = btrfs_find_root_ref(root->fs_info->tree_root, path, | |
3675 | BTRFS_I(dir)->root->root_key.objectid, | |
3676 | location->objectid); | |
3677 | if (ret) { | |
3678 | if (ret < 0) | |
3679 | err = ret; | |
3680 | goto out; | |
3681 | } | |
39279cc3 | 3682 | |
4df27c4d YZ |
3683 | leaf = path->nodes[0]; |
3684 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref); | |
33345d01 | 3685 | if (btrfs_root_ref_dirid(leaf, ref) != btrfs_ino(dir) || |
4df27c4d YZ |
3686 | btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len) |
3687 | goto out; | |
39279cc3 | 3688 | |
4df27c4d YZ |
3689 | ret = memcmp_extent_buffer(leaf, dentry->d_name.name, |
3690 | (unsigned long)(ref + 1), | |
3691 | dentry->d_name.len); | |
3692 | if (ret) | |
3693 | goto out; | |
3694 | ||
b3b4aa74 | 3695 | btrfs_release_path(path); |
4df27c4d YZ |
3696 | |
3697 | new_root = btrfs_read_fs_root_no_name(root->fs_info, location); | |
3698 | if (IS_ERR(new_root)) { | |
3699 | err = PTR_ERR(new_root); | |
3700 | goto out; | |
3701 | } | |
3702 | ||
3703 | if (btrfs_root_refs(&new_root->root_item) == 0) { | |
3704 | err = -ENOENT; | |
3705 | goto out; | |
3706 | } | |
3707 | ||
3708 | *sub_root = new_root; | |
3709 | location->objectid = btrfs_root_dirid(&new_root->root_item); | |
3710 | location->type = BTRFS_INODE_ITEM_KEY; | |
3711 | location->offset = 0; | |
3712 | err = 0; | |
3713 | out: | |
3714 | btrfs_free_path(path); | |
3715 | return err; | |
39279cc3 CM |
3716 | } |
3717 | ||
5d4f98a2 YZ |
3718 | static void inode_tree_add(struct inode *inode) |
3719 | { | |
3720 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3721 | struct btrfs_inode *entry; | |
03e860bd FNP |
3722 | struct rb_node **p; |
3723 | struct rb_node *parent; | |
33345d01 | 3724 | u64 ino = btrfs_ino(inode); |
03e860bd FNP |
3725 | again: |
3726 | p = &root->inode_tree.rb_node; | |
3727 | parent = NULL; | |
5d4f98a2 | 3728 | |
1d3382cb | 3729 | if (inode_unhashed(inode)) |
76dda93c YZ |
3730 | return; |
3731 | ||
5d4f98a2 YZ |
3732 | spin_lock(&root->inode_lock); |
3733 | while (*p) { | |
3734 | parent = *p; | |
3735 | entry = rb_entry(parent, struct btrfs_inode, rb_node); | |
3736 | ||
33345d01 | 3737 | if (ino < btrfs_ino(&entry->vfs_inode)) |
03e860bd | 3738 | p = &parent->rb_left; |
33345d01 | 3739 | else if (ino > btrfs_ino(&entry->vfs_inode)) |
03e860bd | 3740 | p = &parent->rb_right; |
5d4f98a2 YZ |
3741 | else { |
3742 | WARN_ON(!(entry->vfs_inode.i_state & | |
a4ffdde6 | 3743 | (I_WILL_FREE | I_FREEING))); |
03e860bd FNP |
3744 | rb_erase(parent, &root->inode_tree); |
3745 | RB_CLEAR_NODE(parent); | |
3746 | spin_unlock(&root->inode_lock); | |
3747 | goto again; | |
5d4f98a2 YZ |
3748 | } |
3749 | } | |
3750 | rb_link_node(&BTRFS_I(inode)->rb_node, parent, p); | |
3751 | rb_insert_color(&BTRFS_I(inode)->rb_node, &root->inode_tree); | |
3752 | spin_unlock(&root->inode_lock); | |
3753 | } | |
3754 | ||
3755 | static void inode_tree_del(struct inode *inode) | |
3756 | { | |
3757 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
76dda93c | 3758 | int empty = 0; |
5d4f98a2 | 3759 | |
03e860bd | 3760 | spin_lock(&root->inode_lock); |
5d4f98a2 | 3761 | if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) { |
5d4f98a2 | 3762 | rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree); |
5d4f98a2 | 3763 | RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node); |
76dda93c | 3764 | empty = RB_EMPTY_ROOT(&root->inode_tree); |
5d4f98a2 | 3765 | } |
03e860bd | 3766 | spin_unlock(&root->inode_lock); |
76dda93c | 3767 | |
0af3d00b JB |
3768 | /* |
3769 | * Free space cache has inodes in the tree root, but the tree root has a | |
3770 | * root_refs of 0, so this could end up dropping the tree root as a | |
3771 | * snapshot, so we need the extra !root->fs_info->tree_root check to | |
3772 | * make sure we don't drop it. | |
3773 | */ | |
3774 | if (empty && btrfs_root_refs(&root->root_item) == 0 && | |
3775 | root != root->fs_info->tree_root) { | |
76dda93c YZ |
3776 | synchronize_srcu(&root->fs_info->subvol_srcu); |
3777 | spin_lock(&root->inode_lock); | |
3778 | empty = RB_EMPTY_ROOT(&root->inode_tree); | |
3779 | spin_unlock(&root->inode_lock); | |
3780 | if (empty) | |
3781 | btrfs_add_dead_root(root); | |
3782 | } | |
3783 | } | |
3784 | ||
3785 | int btrfs_invalidate_inodes(struct btrfs_root *root) | |
3786 | { | |
3787 | struct rb_node *node; | |
3788 | struct rb_node *prev; | |
3789 | struct btrfs_inode *entry; | |
3790 | struct inode *inode; | |
3791 | u64 objectid = 0; | |
3792 | ||
3793 | WARN_ON(btrfs_root_refs(&root->root_item) != 0); | |
3794 | ||
3795 | spin_lock(&root->inode_lock); | |
3796 | again: | |
3797 | node = root->inode_tree.rb_node; | |
3798 | prev = NULL; | |
3799 | while (node) { | |
3800 | prev = node; | |
3801 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
3802 | ||
33345d01 | 3803 | if (objectid < btrfs_ino(&entry->vfs_inode)) |
76dda93c | 3804 | node = node->rb_left; |
33345d01 | 3805 | else if (objectid > btrfs_ino(&entry->vfs_inode)) |
76dda93c YZ |
3806 | node = node->rb_right; |
3807 | else | |
3808 | break; | |
3809 | } | |
3810 | if (!node) { | |
3811 | while (prev) { | |
3812 | entry = rb_entry(prev, struct btrfs_inode, rb_node); | |
33345d01 | 3813 | if (objectid <= btrfs_ino(&entry->vfs_inode)) { |
76dda93c YZ |
3814 | node = prev; |
3815 | break; | |
3816 | } | |
3817 | prev = rb_next(prev); | |
3818 | } | |
3819 | } | |
3820 | while (node) { | |
3821 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
33345d01 | 3822 | objectid = btrfs_ino(&entry->vfs_inode) + 1; |
76dda93c YZ |
3823 | inode = igrab(&entry->vfs_inode); |
3824 | if (inode) { | |
3825 | spin_unlock(&root->inode_lock); | |
3826 | if (atomic_read(&inode->i_count) > 1) | |
3827 | d_prune_aliases(inode); | |
3828 | /* | |
45321ac5 | 3829 | * btrfs_drop_inode will have it removed from |
76dda93c YZ |
3830 | * the inode cache when its usage count |
3831 | * hits zero. | |
3832 | */ | |
3833 | iput(inode); | |
3834 | cond_resched(); | |
3835 | spin_lock(&root->inode_lock); | |
3836 | goto again; | |
3837 | } | |
3838 | ||
3839 | if (cond_resched_lock(&root->inode_lock)) | |
3840 | goto again; | |
3841 | ||
3842 | node = rb_next(node); | |
3843 | } | |
3844 | spin_unlock(&root->inode_lock); | |
3845 | return 0; | |
5d4f98a2 YZ |
3846 | } |
3847 | ||
e02119d5 CM |
3848 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
3849 | { | |
3850 | struct btrfs_iget_args *args = p; | |
3851 | inode->i_ino = args->ino; | |
e02119d5 | 3852 | BTRFS_I(inode)->root = args->root; |
6a63209f | 3853 | btrfs_set_inode_space_info(args->root, inode); |
39279cc3 CM |
3854 | return 0; |
3855 | } | |
3856 | ||
3857 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
3858 | { | |
3859 | struct btrfs_iget_args *args = opaque; | |
33345d01 | 3860 | return args->ino == btrfs_ino(inode) && |
d397712b | 3861 | args->root == BTRFS_I(inode)->root; |
39279cc3 CM |
3862 | } |
3863 | ||
5d4f98a2 YZ |
3864 | static struct inode *btrfs_iget_locked(struct super_block *s, |
3865 | u64 objectid, | |
3866 | struct btrfs_root *root) | |
39279cc3 CM |
3867 | { |
3868 | struct inode *inode; | |
3869 | struct btrfs_iget_args args; | |
3870 | args.ino = objectid; | |
3871 | args.root = root; | |
3872 | ||
3873 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
3874 | btrfs_init_locked_inode, | |
3875 | (void *)&args); | |
3876 | return inode; | |
3877 | } | |
3878 | ||
1a54ef8c BR |
3879 | /* Get an inode object given its location and corresponding root. |
3880 | * Returns in *is_new if the inode was read from disk | |
3881 | */ | |
3882 | struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, | |
73f73415 | 3883 | struct btrfs_root *root, int *new) |
1a54ef8c BR |
3884 | { |
3885 | struct inode *inode; | |
3886 | ||
3887 | inode = btrfs_iget_locked(s, location->objectid, root); | |
3888 | if (!inode) | |
5d4f98a2 | 3889 | return ERR_PTR(-ENOMEM); |
1a54ef8c BR |
3890 | |
3891 | if (inode->i_state & I_NEW) { | |
3892 | BTRFS_I(inode)->root = root; | |
3893 | memcpy(&BTRFS_I(inode)->location, location, sizeof(*location)); | |
3894 | btrfs_read_locked_inode(inode); | |
1748f843 MF |
3895 | if (!is_bad_inode(inode)) { |
3896 | inode_tree_add(inode); | |
3897 | unlock_new_inode(inode); | |
3898 | if (new) | |
3899 | *new = 1; | |
3900 | } else { | |
e0b6d65b ST |
3901 | unlock_new_inode(inode); |
3902 | iput(inode); | |
3903 | inode = ERR_PTR(-ESTALE); | |
1748f843 MF |
3904 | } |
3905 | } | |
3906 | ||
1a54ef8c BR |
3907 | return inode; |
3908 | } | |
3909 | ||
4df27c4d YZ |
3910 | static struct inode *new_simple_dir(struct super_block *s, |
3911 | struct btrfs_key *key, | |
3912 | struct btrfs_root *root) | |
3913 | { | |
3914 | struct inode *inode = new_inode(s); | |
3915 | ||
3916 | if (!inode) | |
3917 | return ERR_PTR(-ENOMEM); | |
3918 | ||
4df27c4d YZ |
3919 | BTRFS_I(inode)->root = root; |
3920 | memcpy(&BTRFS_I(inode)->location, key, sizeof(*key)); | |
3921 | BTRFS_I(inode)->dummy_inode = 1; | |
3922 | ||
3923 | inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID; | |
3924 | inode->i_op = &simple_dir_inode_operations; | |
3925 | inode->i_fop = &simple_dir_operations; | |
3926 | inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO; | |
3927 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
3928 | ||
3929 | return inode; | |
3930 | } | |
3931 | ||
3de4586c | 3932 | struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) |
39279cc3 | 3933 | { |
d397712b | 3934 | struct inode *inode; |
4df27c4d | 3935 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 CM |
3936 | struct btrfs_root *sub_root = root; |
3937 | struct btrfs_key location; | |
76dda93c | 3938 | int index; |
b4aff1f8 | 3939 | int ret = 0; |
39279cc3 CM |
3940 | |
3941 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
3942 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 3943 | |
b4aff1f8 JB |
3944 | if (unlikely(d_need_lookup(dentry))) { |
3945 | memcpy(&location, dentry->d_fsdata, sizeof(struct btrfs_key)); | |
3946 | kfree(dentry->d_fsdata); | |
3947 | dentry->d_fsdata = NULL; | |
a66e7cc6 JB |
3948 | /* This thing is hashed, drop it for now */ |
3949 | d_drop(dentry); | |
b4aff1f8 JB |
3950 | } else { |
3951 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
3952 | } | |
5f39d397 | 3953 | |
39279cc3 CM |
3954 | if (ret < 0) |
3955 | return ERR_PTR(ret); | |
5f39d397 | 3956 | |
4df27c4d YZ |
3957 | if (location.objectid == 0) |
3958 | return NULL; | |
3959 | ||
3960 | if (location.type == BTRFS_INODE_ITEM_KEY) { | |
73f73415 | 3961 | inode = btrfs_iget(dir->i_sb, &location, root, NULL); |
4df27c4d YZ |
3962 | return inode; |
3963 | } | |
3964 | ||
3965 | BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY); | |
3966 | ||
76dda93c | 3967 | index = srcu_read_lock(&root->fs_info->subvol_srcu); |
4df27c4d YZ |
3968 | ret = fixup_tree_root_location(root, dir, dentry, |
3969 | &location, &sub_root); | |
3970 | if (ret < 0) { | |
3971 | if (ret != -ENOENT) | |
3972 | inode = ERR_PTR(ret); | |
3973 | else | |
3974 | inode = new_simple_dir(dir->i_sb, &location, sub_root); | |
3975 | } else { | |
73f73415 | 3976 | inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL); |
39279cc3 | 3977 | } |
76dda93c YZ |
3978 | srcu_read_unlock(&root->fs_info->subvol_srcu, index); |
3979 | ||
34d19bad | 3980 | if (!IS_ERR(inode) && root != sub_root) { |
c71bf099 YZ |
3981 | down_read(&root->fs_info->cleanup_work_sem); |
3982 | if (!(inode->i_sb->s_flags & MS_RDONLY)) | |
66b4ffd1 | 3983 | ret = btrfs_orphan_cleanup(sub_root); |
c71bf099 | 3984 | up_read(&root->fs_info->cleanup_work_sem); |
66b4ffd1 JB |
3985 | if (ret) |
3986 | inode = ERR_PTR(ret); | |
c71bf099 YZ |
3987 | } |
3988 | ||
3de4586c CM |
3989 | return inode; |
3990 | } | |
3991 | ||
fe15ce44 | 3992 | static int btrfs_dentry_delete(const struct dentry *dentry) |
76dda93c YZ |
3993 | { |
3994 | struct btrfs_root *root; | |
3995 | ||
efefb143 YZ |
3996 | if (!dentry->d_inode && !IS_ROOT(dentry)) |
3997 | dentry = dentry->d_parent; | |
76dda93c | 3998 | |
efefb143 YZ |
3999 | if (dentry->d_inode) { |
4000 | root = BTRFS_I(dentry->d_inode)->root; | |
4001 | if (btrfs_root_refs(&root->root_item) == 0) | |
4002 | return 1; | |
4003 | } | |
76dda93c YZ |
4004 | return 0; |
4005 | } | |
4006 | ||
b4aff1f8 JB |
4007 | static void btrfs_dentry_release(struct dentry *dentry) |
4008 | { | |
4009 | if (dentry->d_fsdata) | |
4010 | kfree(dentry->d_fsdata); | |
4011 | } | |
4012 | ||
3de4586c CM |
4013 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
4014 | struct nameidata *nd) | |
4015 | { | |
a66e7cc6 JB |
4016 | struct dentry *ret; |
4017 | ||
4018 | ret = d_splice_alias(btrfs_lookup_dentry(dir, dentry), dentry); | |
4019 | if (unlikely(d_need_lookup(dentry))) { | |
4020 | spin_lock(&dentry->d_lock); | |
4021 | dentry->d_flags &= ~DCACHE_NEED_LOOKUP; | |
4022 | spin_unlock(&dentry->d_lock); | |
4023 | } | |
4024 | return ret; | |
39279cc3 CM |
4025 | } |
4026 | ||
16cdcec7 | 4027 | unsigned char btrfs_filetype_table[] = { |
39279cc3 CM |
4028 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK |
4029 | }; | |
4030 | ||
cbdf5a24 DW |
4031 | static int btrfs_real_readdir(struct file *filp, void *dirent, |
4032 | filldir_t filldir) | |
39279cc3 | 4033 | { |
6da6abae | 4034 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
4035 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4036 | struct btrfs_item *item; | |
4037 | struct btrfs_dir_item *di; | |
4038 | struct btrfs_key key; | |
5f39d397 | 4039 | struct btrfs_key found_key; |
39279cc3 | 4040 | struct btrfs_path *path; |
16cdcec7 MX |
4041 | struct list_head ins_list; |
4042 | struct list_head del_list; | |
b4aff1f8 | 4043 | struct qstr q; |
39279cc3 | 4044 | int ret; |
5f39d397 | 4045 | struct extent_buffer *leaf; |
39279cc3 | 4046 | int slot; |
39279cc3 CM |
4047 | unsigned char d_type; |
4048 | int over = 0; | |
4049 | u32 di_cur; | |
4050 | u32 di_total; | |
4051 | u32 di_len; | |
4052 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
4053 | char tmp_name[32]; |
4054 | char *name_ptr; | |
4055 | int name_len; | |
16cdcec7 | 4056 | int is_curr = 0; /* filp->f_pos points to the current index? */ |
39279cc3 CM |
4057 | |
4058 | /* FIXME, use a real flag for deciding about the key type */ | |
4059 | if (root->fs_info->tree_root == root) | |
4060 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 4061 | |
3954401f CM |
4062 | /* special case for "." */ |
4063 | if (filp->f_pos == 0) { | |
3765fefa HS |
4064 | over = filldir(dirent, ".", 1, |
4065 | filp->f_pos, btrfs_ino(inode), DT_DIR); | |
3954401f CM |
4066 | if (over) |
4067 | return 0; | |
4068 | filp->f_pos = 1; | |
4069 | } | |
3954401f CM |
4070 | /* special case for .., just use the back ref */ |
4071 | if (filp->f_pos == 1) { | |
5ecc7e5d | 4072 | u64 pino = parent_ino(filp->f_path.dentry); |
3954401f | 4073 | over = filldir(dirent, "..", 2, |
3765fefa | 4074 | filp->f_pos, pino, DT_DIR); |
3954401f | 4075 | if (over) |
49593bfa | 4076 | return 0; |
3954401f CM |
4077 | filp->f_pos = 2; |
4078 | } | |
49593bfa | 4079 | path = btrfs_alloc_path(); |
16cdcec7 MX |
4080 | if (!path) |
4081 | return -ENOMEM; | |
ff5714cc | 4082 | |
026fd317 | 4083 | path->reada = 1; |
49593bfa | 4084 | |
16cdcec7 MX |
4085 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
4086 | INIT_LIST_HEAD(&ins_list); | |
4087 | INIT_LIST_HEAD(&del_list); | |
4088 | btrfs_get_delayed_items(inode, &ins_list, &del_list); | |
4089 | } | |
4090 | ||
39279cc3 CM |
4091 | btrfs_set_key_type(&key, key_type); |
4092 | key.offset = filp->f_pos; | |
33345d01 | 4093 | key.objectid = btrfs_ino(inode); |
5f39d397 | 4094 | |
39279cc3 CM |
4095 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
4096 | if (ret < 0) | |
4097 | goto err; | |
49593bfa DW |
4098 | |
4099 | while (1) { | |
5f39d397 | 4100 | leaf = path->nodes[0]; |
39279cc3 | 4101 | slot = path->slots[0]; |
b9e03af0 LZ |
4102 | if (slot >= btrfs_header_nritems(leaf)) { |
4103 | ret = btrfs_next_leaf(root, path); | |
4104 | if (ret < 0) | |
4105 | goto err; | |
4106 | else if (ret > 0) | |
4107 | break; | |
4108 | continue; | |
39279cc3 | 4109 | } |
3de4586c | 4110 | |
5f39d397 CM |
4111 | item = btrfs_item_nr(leaf, slot); |
4112 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
4113 | ||
4114 | if (found_key.objectid != key.objectid) | |
39279cc3 | 4115 | break; |
5f39d397 | 4116 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 4117 | break; |
5f39d397 | 4118 | if (found_key.offset < filp->f_pos) |
b9e03af0 | 4119 | goto next; |
16cdcec7 MX |
4120 | if (key_type == BTRFS_DIR_INDEX_KEY && |
4121 | btrfs_should_delete_dir_index(&del_list, | |
4122 | found_key.offset)) | |
4123 | goto next; | |
5f39d397 CM |
4124 | |
4125 | filp->f_pos = found_key.offset; | |
16cdcec7 | 4126 | is_curr = 1; |
49593bfa | 4127 | |
39279cc3 CM |
4128 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
4129 | di_cur = 0; | |
5f39d397 | 4130 | di_total = btrfs_item_size(leaf, item); |
49593bfa DW |
4131 | |
4132 | while (di_cur < di_total) { | |
5f39d397 | 4133 | struct btrfs_key location; |
b4aff1f8 | 4134 | struct dentry *tmp; |
5f39d397 | 4135 | |
22a94d44 JB |
4136 | if (verify_dir_item(root, leaf, di)) |
4137 | break; | |
4138 | ||
5f39d397 | 4139 | name_len = btrfs_dir_name_len(leaf, di); |
49593bfa | 4140 | if (name_len <= sizeof(tmp_name)) { |
5f39d397 CM |
4141 | name_ptr = tmp_name; |
4142 | } else { | |
4143 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
49593bfa DW |
4144 | if (!name_ptr) { |
4145 | ret = -ENOMEM; | |
4146 | goto err; | |
4147 | } | |
5f39d397 CM |
4148 | } |
4149 | read_extent_buffer(leaf, name_ptr, | |
4150 | (unsigned long)(di + 1), name_len); | |
4151 | ||
4152 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
4153 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
3de4586c | 4154 | |
b4aff1f8 JB |
4155 | q.name = name_ptr; |
4156 | q.len = name_len; | |
4157 | q.hash = full_name_hash(q.name, q.len); | |
4158 | tmp = d_lookup(filp->f_dentry, &q); | |
4159 | if (!tmp) { | |
4160 | struct btrfs_key *newkey; | |
4161 | ||
4162 | newkey = kzalloc(sizeof(struct btrfs_key), | |
4163 | GFP_NOFS); | |
4164 | if (!newkey) | |
4165 | goto no_dentry; | |
4166 | tmp = d_alloc(filp->f_dentry, &q); | |
4167 | if (!tmp) { | |
4168 | kfree(newkey); | |
4169 | dput(tmp); | |
4170 | goto no_dentry; | |
4171 | } | |
4172 | memcpy(newkey, &location, | |
4173 | sizeof(struct btrfs_key)); | |
4174 | tmp->d_fsdata = newkey; | |
4175 | tmp->d_flags |= DCACHE_NEED_LOOKUP; | |
4176 | d_rehash(tmp); | |
4177 | dput(tmp); | |
4178 | } else { | |
4179 | dput(tmp); | |
4180 | } | |
4181 | no_dentry: | |
3de4586c CM |
4182 | /* is this a reference to our own snapshot? If so |
4183 | * skip it | |
4184 | */ | |
4185 | if (location.type == BTRFS_ROOT_ITEM_KEY && | |
4186 | location.objectid == root->root_key.objectid) { | |
4187 | over = 0; | |
4188 | goto skip; | |
4189 | } | |
5f39d397 | 4190 | over = filldir(dirent, name_ptr, name_len, |
49593bfa | 4191 | found_key.offset, location.objectid, |
39279cc3 | 4192 | d_type); |
5f39d397 | 4193 | |
3de4586c | 4194 | skip: |
5f39d397 CM |
4195 | if (name_ptr != tmp_name) |
4196 | kfree(name_ptr); | |
4197 | ||
39279cc3 CM |
4198 | if (over) |
4199 | goto nopos; | |
5103e947 | 4200 | di_len = btrfs_dir_name_len(leaf, di) + |
49593bfa | 4201 | btrfs_dir_data_len(leaf, di) + sizeof(*di); |
39279cc3 CM |
4202 | di_cur += di_len; |
4203 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
4204 | } | |
b9e03af0 LZ |
4205 | next: |
4206 | path->slots[0]++; | |
39279cc3 | 4207 | } |
49593bfa | 4208 | |
16cdcec7 MX |
4209 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
4210 | if (is_curr) | |
4211 | filp->f_pos++; | |
4212 | ret = btrfs_readdir_delayed_dir_index(filp, dirent, filldir, | |
4213 | &ins_list); | |
4214 | if (ret) | |
4215 | goto nopos; | |
4216 | } | |
4217 | ||
49593bfa | 4218 | /* Reached end of directory/root. Bump pos past the last item. */ |
5e591a07 | 4219 | if (key_type == BTRFS_DIR_INDEX_KEY) |
406266ab JE |
4220 | /* |
4221 | * 32-bit glibc will use getdents64, but then strtol - | |
4222 | * so the last number we can serve is this. | |
4223 | */ | |
4224 | filp->f_pos = 0x7fffffff; | |
5e591a07 YZ |
4225 | else |
4226 | filp->f_pos++; | |
39279cc3 CM |
4227 | nopos: |
4228 | ret = 0; | |
4229 | err: | |
16cdcec7 MX |
4230 | if (key_type == BTRFS_DIR_INDEX_KEY) |
4231 | btrfs_put_delayed_items(&ins_list, &del_list); | |
39279cc3 | 4232 | btrfs_free_path(path); |
39279cc3 CM |
4233 | return ret; |
4234 | } | |
4235 | ||
a9185b41 | 4236 | int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
39279cc3 CM |
4237 | { |
4238 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4239 | struct btrfs_trans_handle *trans; | |
4240 | int ret = 0; | |
0af3d00b | 4241 | bool nolock = false; |
39279cc3 | 4242 | |
8929ecfa | 4243 | if (BTRFS_I(inode)->dummy_inode) |
4ca8b41e CM |
4244 | return 0; |
4245 | ||
2cf8572d | 4246 | if (btrfs_fs_closing(root->fs_info) && btrfs_is_free_space_inode(root, inode)) |
82d5902d | 4247 | nolock = true; |
0af3d00b | 4248 | |
a9185b41 | 4249 | if (wbc->sync_mode == WB_SYNC_ALL) { |
0af3d00b | 4250 | if (nolock) |
7a7eaa40 | 4251 | trans = btrfs_join_transaction_nolock(root); |
0af3d00b | 4252 | else |
7a7eaa40 | 4253 | trans = btrfs_join_transaction(root); |
3612b495 TI |
4254 | if (IS_ERR(trans)) |
4255 | return PTR_ERR(trans); | |
0af3d00b JB |
4256 | if (nolock) |
4257 | ret = btrfs_end_transaction_nolock(trans, root); | |
4258 | else | |
4259 | ret = btrfs_commit_transaction(trans, root); | |
39279cc3 CM |
4260 | } |
4261 | return ret; | |
4262 | } | |
4263 | ||
4264 | /* | |
54aa1f4d | 4265 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
4266 | * inode changes. But, it is most likely to find the inode in cache. |
4267 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
4268 | * to keep or drop this code. | |
4269 | */ | |
22c44fe6 | 4270 | int btrfs_dirty_inode(struct inode *inode) |
39279cc3 CM |
4271 | { |
4272 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4273 | struct btrfs_trans_handle *trans; | |
8929ecfa YZ |
4274 | int ret; |
4275 | ||
4276 | if (BTRFS_I(inode)->dummy_inode) | |
22c44fe6 | 4277 | return 0; |
39279cc3 | 4278 | |
7a7eaa40 | 4279 | trans = btrfs_join_transaction(root); |
22c44fe6 JB |
4280 | if (IS_ERR(trans)) |
4281 | return PTR_ERR(trans); | |
8929ecfa YZ |
4282 | |
4283 | ret = btrfs_update_inode(trans, root, inode); | |
94b60442 CM |
4284 | if (ret && ret == -ENOSPC) { |
4285 | /* whoops, lets try again with the full transaction */ | |
4286 | btrfs_end_transaction(trans, root); | |
4287 | trans = btrfs_start_transaction(root, 1); | |
22c44fe6 JB |
4288 | if (IS_ERR(trans)) |
4289 | return PTR_ERR(trans); | |
8929ecfa | 4290 | |
94b60442 | 4291 | ret = btrfs_update_inode(trans, root, inode); |
94b60442 | 4292 | } |
39279cc3 | 4293 | btrfs_end_transaction(trans, root); |
16cdcec7 MX |
4294 | if (BTRFS_I(inode)->delayed_node) |
4295 | btrfs_balance_delayed_items(root); | |
22c44fe6 JB |
4296 | |
4297 | return ret; | |
4298 | } | |
4299 | ||
4300 | /* | |
4301 | * This is a copy of file_update_time. We need this so we can return error on | |
4302 | * ENOSPC for updating the inode in the case of file write and mmap writes. | |
4303 | */ | |
4304 | int btrfs_update_time(struct file *file) | |
4305 | { | |
4306 | struct inode *inode = file->f_path.dentry->d_inode; | |
4307 | struct timespec now; | |
4308 | int ret; | |
4309 | enum { S_MTIME = 1, S_CTIME = 2, S_VERSION = 4 } sync_it = 0; | |
4310 | ||
4311 | /* First try to exhaust all avenues to not sync */ | |
4312 | if (IS_NOCMTIME(inode)) | |
4313 | return 0; | |
4314 | ||
4315 | now = current_fs_time(inode->i_sb); | |
4316 | if (!timespec_equal(&inode->i_mtime, &now)) | |
4317 | sync_it = S_MTIME; | |
4318 | ||
4319 | if (!timespec_equal(&inode->i_ctime, &now)) | |
4320 | sync_it |= S_CTIME; | |
4321 | ||
4322 | if (IS_I_VERSION(inode)) | |
4323 | sync_it |= S_VERSION; | |
4324 | ||
4325 | if (!sync_it) | |
4326 | return 0; | |
4327 | ||
4328 | /* Finally allowed to write? Takes lock. */ | |
4329 | if (mnt_want_write_file(file)) | |
4330 | return 0; | |
4331 | ||
4332 | /* Only change inode inside the lock region */ | |
4333 | if (sync_it & S_VERSION) | |
4334 | inode_inc_iversion(inode); | |
4335 | if (sync_it & S_CTIME) | |
4336 | inode->i_ctime = now; | |
4337 | if (sync_it & S_MTIME) | |
4338 | inode->i_mtime = now; | |
4339 | ret = btrfs_dirty_inode(inode); | |
4340 | if (!ret) | |
4341 | mark_inode_dirty_sync(inode); | |
4342 | mnt_drop_write(file->f_path.mnt); | |
4343 | return ret; | |
39279cc3 CM |
4344 | } |
4345 | ||
d352ac68 CM |
4346 | /* |
4347 | * find the highest existing sequence number in a directory | |
4348 | * and then set the in-memory index_cnt variable to reflect | |
4349 | * free sequence numbers | |
4350 | */ | |
aec7477b JB |
4351 | static int btrfs_set_inode_index_count(struct inode *inode) |
4352 | { | |
4353 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4354 | struct btrfs_key key, found_key; | |
4355 | struct btrfs_path *path; | |
4356 | struct extent_buffer *leaf; | |
4357 | int ret; | |
4358 | ||
33345d01 | 4359 | key.objectid = btrfs_ino(inode); |
aec7477b JB |
4360 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); |
4361 | key.offset = (u64)-1; | |
4362 | ||
4363 | path = btrfs_alloc_path(); | |
4364 | if (!path) | |
4365 | return -ENOMEM; | |
4366 | ||
4367 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
4368 | if (ret < 0) | |
4369 | goto out; | |
4370 | /* FIXME: we should be able to handle this */ | |
4371 | if (ret == 0) | |
4372 | goto out; | |
4373 | ret = 0; | |
4374 | ||
4375 | /* | |
4376 | * MAGIC NUMBER EXPLANATION: | |
4377 | * since we search a directory based on f_pos we have to start at 2 | |
4378 | * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody | |
4379 | * else has to start at 2 | |
4380 | */ | |
4381 | if (path->slots[0] == 0) { | |
4382 | BTRFS_I(inode)->index_cnt = 2; | |
4383 | goto out; | |
4384 | } | |
4385 | ||
4386 | path->slots[0]--; | |
4387 | ||
4388 | leaf = path->nodes[0]; | |
4389 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
4390 | ||
33345d01 | 4391 | if (found_key.objectid != btrfs_ino(inode) || |
aec7477b JB |
4392 | btrfs_key_type(&found_key) != BTRFS_DIR_INDEX_KEY) { |
4393 | BTRFS_I(inode)->index_cnt = 2; | |
4394 | goto out; | |
4395 | } | |
4396 | ||
4397 | BTRFS_I(inode)->index_cnt = found_key.offset + 1; | |
4398 | out: | |
4399 | btrfs_free_path(path); | |
4400 | return ret; | |
4401 | } | |
4402 | ||
d352ac68 CM |
4403 | /* |
4404 | * helper to find a free sequence number in a given directory. This current | |
4405 | * code is very simple, later versions will do smarter things in the btree | |
4406 | */ | |
3de4586c | 4407 | int btrfs_set_inode_index(struct inode *dir, u64 *index) |
aec7477b JB |
4408 | { |
4409 | int ret = 0; | |
4410 | ||
4411 | if (BTRFS_I(dir)->index_cnt == (u64)-1) { | |
16cdcec7 MX |
4412 | ret = btrfs_inode_delayed_dir_index_count(dir); |
4413 | if (ret) { | |
4414 | ret = btrfs_set_inode_index_count(dir); | |
4415 | if (ret) | |
4416 | return ret; | |
4417 | } | |
aec7477b JB |
4418 | } |
4419 | ||
00e4e6b3 | 4420 | *index = BTRFS_I(dir)->index_cnt; |
aec7477b JB |
4421 | BTRFS_I(dir)->index_cnt++; |
4422 | ||
4423 | return ret; | |
4424 | } | |
4425 | ||
39279cc3 CM |
4426 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
4427 | struct btrfs_root *root, | |
aec7477b | 4428 | struct inode *dir, |
9c58309d | 4429 | const char *name, int name_len, |
175a4eb7 AV |
4430 | u64 ref_objectid, u64 objectid, |
4431 | umode_t mode, u64 *index) | |
39279cc3 CM |
4432 | { |
4433 | struct inode *inode; | |
5f39d397 | 4434 | struct btrfs_inode_item *inode_item; |
39279cc3 | 4435 | struct btrfs_key *location; |
5f39d397 | 4436 | struct btrfs_path *path; |
9c58309d CM |
4437 | struct btrfs_inode_ref *ref; |
4438 | struct btrfs_key key[2]; | |
4439 | u32 sizes[2]; | |
4440 | unsigned long ptr; | |
39279cc3 CM |
4441 | int ret; |
4442 | int owner; | |
4443 | ||
5f39d397 | 4444 | path = btrfs_alloc_path(); |
d8926bb3 MF |
4445 | if (!path) |
4446 | return ERR_PTR(-ENOMEM); | |
5f39d397 | 4447 | |
39279cc3 | 4448 | inode = new_inode(root->fs_info->sb); |
8fb27640 YS |
4449 | if (!inode) { |
4450 | btrfs_free_path(path); | |
39279cc3 | 4451 | return ERR_PTR(-ENOMEM); |
8fb27640 | 4452 | } |
39279cc3 | 4453 | |
581bb050 LZ |
4454 | /* |
4455 | * we have to initialize this early, so we can reclaim the inode | |
4456 | * number if we fail afterwards in this function. | |
4457 | */ | |
4458 | inode->i_ino = objectid; | |
4459 | ||
aec7477b | 4460 | if (dir) { |
1abe9b8a | 4461 | trace_btrfs_inode_request(dir); |
4462 | ||
3de4586c | 4463 | ret = btrfs_set_inode_index(dir, index); |
09771430 | 4464 | if (ret) { |
8fb27640 | 4465 | btrfs_free_path(path); |
09771430 | 4466 | iput(inode); |
aec7477b | 4467 | return ERR_PTR(ret); |
09771430 | 4468 | } |
aec7477b JB |
4469 | } |
4470 | /* | |
4471 | * index_cnt is ignored for everything but a dir, | |
4472 | * btrfs_get_inode_index_count has an explanation for the magic | |
4473 | * number | |
4474 | */ | |
4475 | BTRFS_I(inode)->index_cnt = 2; | |
39279cc3 | 4476 | BTRFS_I(inode)->root = root; |
e02119d5 | 4477 | BTRFS_I(inode)->generation = trans->transid; |
76195853 | 4478 | inode->i_generation = BTRFS_I(inode)->generation; |
6a63209f | 4479 | btrfs_set_inode_space_info(root, inode); |
b888db2b | 4480 | |
569254b0 | 4481 | if (S_ISDIR(mode)) |
39279cc3 CM |
4482 | owner = 0; |
4483 | else | |
4484 | owner = 1; | |
9c58309d CM |
4485 | |
4486 | key[0].objectid = objectid; | |
4487 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
4488 | key[0].offset = 0; | |
4489 | ||
4490 | key[1].objectid = objectid; | |
4491 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
4492 | key[1].offset = ref_objectid; | |
4493 | ||
4494 | sizes[0] = sizeof(struct btrfs_inode_item); | |
4495 | sizes[1] = name_len + sizeof(*ref); | |
4496 | ||
b9473439 | 4497 | path->leave_spinning = 1; |
9c58309d CM |
4498 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); |
4499 | if (ret != 0) | |
5f39d397 CM |
4500 | goto fail; |
4501 | ||
ecc11fab | 4502 | inode_init_owner(inode, dir, mode); |
a76a3cd4 | 4503 | inode_set_bytes(inode, 0); |
39279cc3 | 4504 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
5f39d397 CM |
4505 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
4506 | struct btrfs_inode_item); | |
e02119d5 | 4507 | fill_inode_item(trans, path->nodes[0], inode_item, inode); |
9c58309d CM |
4508 | |
4509 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
4510 | struct btrfs_inode_ref); | |
4511 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
00e4e6b3 | 4512 | btrfs_set_inode_ref_index(path->nodes[0], ref, *index); |
9c58309d CM |
4513 | ptr = (unsigned long)(ref + 1); |
4514 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
4515 | ||
5f39d397 CM |
4516 | btrfs_mark_buffer_dirty(path->nodes[0]); |
4517 | btrfs_free_path(path); | |
4518 | ||
39279cc3 CM |
4519 | location = &BTRFS_I(inode)->location; |
4520 | location->objectid = objectid; | |
39279cc3 CM |
4521 | location->offset = 0; |
4522 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
4523 | ||
6cbff00f CH |
4524 | btrfs_inherit_iflags(inode, dir); |
4525 | ||
569254b0 | 4526 | if (S_ISREG(mode)) { |
94272164 CM |
4527 | if (btrfs_test_opt(root, NODATASUM)) |
4528 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; | |
75e7cb7f LB |
4529 | if (btrfs_test_opt(root, NODATACOW) || |
4530 | (BTRFS_I(dir)->flags & BTRFS_INODE_NODATACOW)) | |
94272164 CM |
4531 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; |
4532 | } | |
4533 | ||
39279cc3 | 4534 | insert_inode_hash(inode); |
5d4f98a2 | 4535 | inode_tree_add(inode); |
1abe9b8a | 4536 | |
4537 | trace_btrfs_inode_new(inode); | |
1973f0fa | 4538 | btrfs_set_inode_last_trans(trans, inode); |
1abe9b8a | 4539 | |
39279cc3 | 4540 | return inode; |
5f39d397 | 4541 | fail: |
aec7477b JB |
4542 | if (dir) |
4543 | BTRFS_I(dir)->index_cnt--; | |
5f39d397 | 4544 | btrfs_free_path(path); |
09771430 | 4545 | iput(inode); |
5f39d397 | 4546 | return ERR_PTR(ret); |
39279cc3 CM |
4547 | } |
4548 | ||
4549 | static inline u8 btrfs_inode_type(struct inode *inode) | |
4550 | { | |
4551 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
4552 | } | |
4553 | ||
d352ac68 CM |
4554 | /* |
4555 | * utility function to add 'inode' into 'parent_inode' with | |
4556 | * a give name and a given sequence number. | |
4557 | * if 'add_backref' is true, also insert a backref from the | |
4558 | * inode to the parent directory. | |
4559 | */ | |
e02119d5 CM |
4560 | int btrfs_add_link(struct btrfs_trans_handle *trans, |
4561 | struct inode *parent_inode, struct inode *inode, | |
4562 | const char *name, int name_len, int add_backref, u64 index) | |
39279cc3 | 4563 | { |
4df27c4d | 4564 | int ret = 0; |
39279cc3 | 4565 | struct btrfs_key key; |
e02119d5 | 4566 | struct btrfs_root *root = BTRFS_I(parent_inode)->root; |
33345d01 LZ |
4567 | u64 ino = btrfs_ino(inode); |
4568 | u64 parent_ino = btrfs_ino(parent_inode); | |
5f39d397 | 4569 | |
33345d01 | 4570 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
4571 | memcpy(&key, &BTRFS_I(inode)->root->root_key, sizeof(key)); |
4572 | } else { | |
33345d01 | 4573 | key.objectid = ino; |
4df27c4d YZ |
4574 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
4575 | key.offset = 0; | |
4576 | } | |
4577 | ||
33345d01 | 4578 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
4579 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4580 | key.objectid, root->root_key.objectid, | |
33345d01 | 4581 | parent_ino, index, name, name_len); |
4df27c4d | 4582 | } else if (add_backref) { |
33345d01 LZ |
4583 | ret = btrfs_insert_inode_ref(trans, root, name, name_len, ino, |
4584 | parent_ino, index); | |
4df27c4d | 4585 | } |
39279cc3 | 4586 | |
39279cc3 | 4587 | if (ret == 0) { |
4df27c4d | 4588 | ret = btrfs_insert_dir_item(trans, root, name, name_len, |
16cdcec7 | 4589 | parent_inode, &key, |
4df27c4d | 4590 | btrfs_inode_type(inode), index); |
fe66a05a CM |
4591 | if (ret) |
4592 | goto fail_dir_item; | |
4df27c4d | 4593 | |
dbe674a9 | 4594 | btrfs_i_size_write(parent_inode, parent_inode->i_size + |
e02119d5 | 4595 | name_len * 2); |
79c44584 | 4596 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
e02119d5 | 4597 | ret = btrfs_update_inode(trans, root, parent_inode); |
39279cc3 CM |
4598 | } |
4599 | return ret; | |
fe66a05a CM |
4600 | |
4601 | fail_dir_item: | |
4602 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { | |
4603 | u64 local_index; | |
4604 | int err; | |
4605 | err = btrfs_del_root_ref(trans, root->fs_info->tree_root, | |
4606 | key.objectid, root->root_key.objectid, | |
4607 | parent_ino, &local_index, name, name_len); | |
4608 | ||
4609 | } else if (add_backref) { | |
4610 | u64 local_index; | |
4611 | int err; | |
4612 | ||
4613 | err = btrfs_del_inode_ref(trans, root, name, name_len, | |
4614 | ino, parent_ino, &local_index); | |
4615 | } | |
4616 | return ret; | |
39279cc3 CM |
4617 | } |
4618 | ||
4619 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
a1b075d2 JB |
4620 | struct inode *dir, struct dentry *dentry, |
4621 | struct inode *inode, int backref, u64 index) | |
39279cc3 | 4622 | { |
a1b075d2 JB |
4623 | int err = btrfs_add_link(trans, dir, inode, |
4624 | dentry->d_name.name, dentry->d_name.len, | |
4625 | backref, index); | |
39279cc3 CM |
4626 | if (err > 0) |
4627 | err = -EEXIST; | |
4628 | return err; | |
4629 | } | |
4630 | ||
618e21d5 | 4631 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1a67aafb | 4632 | umode_t mode, dev_t rdev) |
618e21d5 JB |
4633 | { |
4634 | struct btrfs_trans_handle *trans; | |
4635 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 4636 | struct inode *inode = NULL; |
618e21d5 JB |
4637 | int err; |
4638 | int drop_inode = 0; | |
4639 | u64 objectid; | |
1832a6d5 | 4640 | unsigned long nr = 0; |
00e4e6b3 | 4641 | u64 index = 0; |
618e21d5 JB |
4642 | |
4643 | if (!new_valid_dev(rdev)) | |
4644 | return -EINVAL; | |
4645 | ||
9ed74f2d JB |
4646 | /* |
4647 | * 2 for inode item and ref | |
4648 | * 2 for dir items | |
4649 | * 1 for xattr if selinux is on | |
4650 | */ | |
a22285a6 YZ |
4651 | trans = btrfs_start_transaction(root, 5); |
4652 | if (IS_ERR(trans)) | |
4653 | return PTR_ERR(trans); | |
1832a6d5 | 4654 | |
581bb050 LZ |
4655 | err = btrfs_find_free_ino(root, &objectid); |
4656 | if (err) | |
4657 | goto out_unlock; | |
4658 | ||
aec7477b | 4659 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 4660 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 4661 | mode, &index); |
7cf96da3 TI |
4662 | if (IS_ERR(inode)) { |
4663 | err = PTR_ERR(inode); | |
618e21d5 | 4664 | goto out_unlock; |
7cf96da3 | 4665 | } |
618e21d5 | 4666 | |
2a7dba39 | 4667 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
33268eaf JB |
4668 | if (err) { |
4669 | drop_inode = 1; | |
4670 | goto out_unlock; | |
4671 | } | |
4672 | ||
ad19db71 CS |
4673 | /* |
4674 | * If the active LSM wants to access the inode during | |
4675 | * d_instantiate it needs these. Smack checks to see | |
4676 | * if the filesystem supports xattrs by looking at the | |
4677 | * ops vector. | |
4678 | */ | |
4679 | ||
4680 | inode->i_op = &btrfs_special_inode_operations; | |
a1b075d2 | 4681 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
618e21d5 JB |
4682 | if (err) |
4683 | drop_inode = 1; | |
4684 | else { | |
618e21d5 | 4685 | init_special_inode(inode, inode->i_mode, rdev); |
1b4ab1bb | 4686 | btrfs_update_inode(trans, root, inode); |
08c422c2 | 4687 | d_instantiate(dentry, inode); |
618e21d5 | 4688 | } |
618e21d5 | 4689 | out_unlock: |
d3c2fdcf | 4690 | nr = trans->blocks_used; |
7ad85bb7 | 4691 | btrfs_end_transaction(trans, root); |
a22285a6 | 4692 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
4693 | if (drop_inode) { |
4694 | inode_dec_link_count(inode); | |
4695 | iput(inode); | |
4696 | } | |
618e21d5 JB |
4697 | return err; |
4698 | } | |
4699 | ||
39279cc3 | 4700 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
4acdaf27 | 4701 | umode_t mode, struct nameidata *nd) |
39279cc3 CM |
4702 | { |
4703 | struct btrfs_trans_handle *trans; | |
4704 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 4705 | struct inode *inode = NULL; |
39279cc3 | 4706 | int drop_inode = 0; |
a22285a6 | 4707 | int err; |
1832a6d5 | 4708 | unsigned long nr = 0; |
39279cc3 | 4709 | u64 objectid; |
00e4e6b3 | 4710 | u64 index = 0; |
39279cc3 | 4711 | |
9ed74f2d JB |
4712 | /* |
4713 | * 2 for inode item and ref | |
4714 | * 2 for dir items | |
4715 | * 1 for xattr if selinux is on | |
4716 | */ | |
a22285a6 YZ |
4717 | trans = btrfs_start_transaction(root, 5); |
4718 | if (IS_ERR(trans)) | |
4719 | return PTR_ERR(trans); | |
9ed74f2d | 4720 | |
581bb050 LZ |
4721 | err = btrfs_find_free_ino(root, &objectid); |
4722 | if (err) | |
4723 | goto out_unlock; | |
4724 | ||
aec7477b | 4725 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 4726 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 4727 | mode, &index); |
7cf96da3 TI |
4728 | if (IS_ERR(inode)) { |
4729 | err = PTR_ERR(inode); | |
39279cc3 | 4730 | goto out_unlock; |
7cf96da3 | 4731 | } |
39279cc3 | 4732 | |
2a7dba39 | 4733 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
33268eaf JB |
4734 | if (err) { |
4735 | drop_inode = 1; | |
4736 | goto out_unlock; | |
4737 | } | |
4738 | ||
ad19db71 CS |
4739 | /* |
4740 | * If the active LSM wants to access the inode during | |
4741 | * d_instantiate it needs these. Smack checks to see | |
4742 | * if the filesystem supports xattrs by looking at the | |
4743 | * ops vector. | |
4744 | */ | |
4745 | inode->i_fop = &btrfs_file_operations; | |
4746 | inode->i_op = &btrfs_file_inode_operations; | |
4747 | ||
a1b075d2 | 4748 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
39279cc3 CM |
4749 | if (err) |
4750 | drop_inode = 1; | |
4751 | else { | |
4752 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 4753 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 4754 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
08c422c2 | 4755 | d_instantiate(dentry, inode); |
39279cc3 | 4756 | } |
39279cc3 | 4757 | out_unlock: |
d3c2fdcf | 4758 | nr = trans->blocks_used; |
7ad85bb7 | 4759 | btrfs_end_transaction(trans, root); |
39279cc3 CM |
4760 | if (drop_inode) { |
4761 | inode_dec_link_count(inode); | |
4762 | iput(inode); | |
4763 | } | |
d3c2fdcf | 4764 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
4765 | return err; |
4766 | } | |
4767 | ||
4768 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
4769 | struct dentry *dentry) | |
4770 | { | |
4771 | struct btrfs_trans_handle *trans; | |
4772 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
4773 | struct inode *inode = old_dentry->d_inode; | |
00e4e6b3 | 4774 | u64 index; |
1832a6d5 | 4775 | unsigned long nr = 0; |
39279cc3 CM |
4776 | int err; |
4777 | int drop_inode = 0; | |
4778 | ||
4a8be425 TH |
4779 | /* do not allow sys_link's with other subvols of the same device */ |
4780 | if (root->objectid != BTRFS_I(inode)->root->objectid) | |
3ab3564f | 4781 | return -EXDEV; |
4a8be425 | 4782 | |
c055e99e AV |
4783 | if (inode->i_nlink == ~0U) |
4784 | return -EMLINK; | |
4a8be425 | 4785 | |
3de4586c | 4786 | err = btrfs_set_inode_index(dir, &index); |
aec7477b JB |
4787 | if (err) |
4788 | goto fail; | |
4789 | ||
a22285a6 | 4790 | /* |
7e6b6465 | 4791 | * 2 items for inode and inode ref |
a22285a6 | 4792 | * 2 items for dir items |
7e6b6465 | 4793 | * 1 item for parent inode |
a22285a6 | 4794 | */ |
7e6b6465 | 4795 | trans = btrfs_start_transaction(root, 5); |
a22285a6 YZ |
4796 | if (IS_ERR(trans)) { |
4797 | err = PTR_ERR(trans); | |
4798 | goto fail; | |
4799 | } | |
5f39d397 | 4800 | |
3153495d MX |
4801 | btrfs_inc_nlink(inode); |
4802 | inode->i_ctime = CURRENT_TIME; | |
7de9c6ee | 4803 | ihold(inode); |
aec7477b | 4804 | |
a1b075d2 | 4805 | err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index); |
5f39d397 | 4806 | |
a5719521 | 4807 | if (err) { |
54aa1f4d | 4808 | drop_inode = 1; |
a5719521 | 4809 | } else { |
10d9f309 | 4810 | struct dentry *parent = dentry->d_parent; |
a5719521 YZ |
4811 | err = btrfs_update_inode(trans, root, inode); |
4812 | BUG_ON(err); | |
08c422c2 | 4813 | d_instantiate(dentry, inode); |
6a912213 | 4814 | btrfs_log_new_name(trans, inode, NULL, parent); |
a5719521 | 4815 | } |
39279cc3 | 4816 | |
d3c2fdcf | 4817 | nr = trans->blocks_used; |
7ad85bb7 | 4818 | btrfs_end_transaction(trans, root); |
1832a6d5 | 4819 | fail: |
39279cc3 CM |
4820 | if (drop_inode) { |
4821 | inode_dec_link_count(inode); | |
4822 | iput(inode); | |
4823 | } | |
d3c2fdcf | 4824 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
4825 | return err; |
4826 | } | |
4827 | ||
18bb1db3 | 4828 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
39279cc3 | 4829 | { |
b9d86667 | 4830 | struct inode *inode = NULL; |
39279cc3 CM |
4831 | struct btrfs_trans_handle *trans; |
4832 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
4833 | int err = 0; | |
4834 | int drop_on_err = 0; | |
b9d86667 | 4835 | u64 objectid = 0; |
00e4e6b3 | 4836 | u64 index = 0; |
d3c2fdcf | 4837 | unsigned long nr = 1; |
39279cc3 | 4838 | |
9ed74f2d JB |
4839 | /* |
4840 | * 2 items for inode and ref | |
4841 | * 2 items for dir items | |
4842 | * 1 for xattr if selinux is on | |
4843 | */ | |
a22285a6 YZ |
4844 | trans = btrfs_start_transaction(root, 5); |
4845 | if (IS_ERR(trans)) | |
4846 | return PTR_ERR(trans); | |
39279cc3 | 4847 | |
581bb050 LZ |
4848 | err = btrfs_find_free_ino(root, &objectid); |
4849 | if (err) | |
4850 | goto out_fail; | |
4851 | ||
aec7477b | 4852 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 4853 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 4854 | S_IFDIR | mode, &index); |
39279cc3 CM |
4855 | if (IS_ERR(inode)) { |
4856 | err = PTR_ERR(inode); | |
4857 | goto out_fail; | |
4858 | } | |
5f39d397 | 4859 | |
39279cc3 | 4860 | drop_on_err = 1; |
33268eaf | 4861 | |
2a7dba39 | 4862 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
33268eaf JB |
4863 | if (err) |
4864 | goto out_fail; | |
4865 | ||
39279cc3 CM |
4866 | inode->i_op = &btrfs_dir_inode_operations; |
4867 | inode->i_fop = &btrfs_dir_file_operations; | |
39279cc3 | 4868 | |
dbe674a9 | 4869 | btrfs_i_size_write(inode, 0); |
39279cc3 CM |
4870 | err = btrfs_update_inode(trans, root, inode); |
4871 | if (err) | |
4872 | goto out_fail; | |
5f39d397 | 4873 | |
a1b075d2 JB |
4874 | err = btrfs_add_link(trans, dir, inode, dentry->d_name.name, |
4875 | dentry->d_name.len, 0, index); | |
39279cc3 CM |
4876 | if (err) |
4877 | goto out_fail; | |
5f39d397 | 4878 | |
39279cc3 CM |
4879 | d_instantiate(dentry, inode); |
4880 | drop_on_err = 0; | |
39279cc3 CM |
4881 | |
4882 | out_fail: | |
d3c2fdcf | 4883 | nr = trans->blocks_used; |
7ad85bb7 | 4884 | btrfs_end_transaction(trans, root); |
39279cc3 CM |
4885 | if (drop_on_err) |
4886 | iput(inode); | |
d3c2fdcf | 4887 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
4888 | return err; |
4889 | } | |
4890 | ||
d352ac68 CM |
4891 | /* helper for btfs_get_extent. Given an existing extent in the tree, |
4892 | * and an extent that you want to insert, deal with overlap and insert | |
4893 | * the new extent into the tree. | |
4894 | */ | |
3b951516 CM |
4895 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
4896 | struct extent_map *existing, | |
e6dcd2dc CM |
4897 | struct extent_map *em, |
4898 | u64 map_start, u64 map_len) | |
3b951516 CM |
4899 | { |
4900 | u64 start_diff; | |
3b951516 | 4901 | |
e6dcd2dc CM |
4902 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
4903 | start_diff = map_start - em->start; | |
4904 | em->start = map_start; | |
4905 | em->len = map_len; | |
c8b97818 CM |
4906 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
4907 | !test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
e6dcd2dc | 4908 | em->block_start += start_diff; |
c8b97818 CM |
4909 | em->block_len -= start_diff; |
4910 | } | |
e6dcd2dc | 4911 | return add_extent_mapping(em_tree, em); |
3b951516 CM |
4912 | } |
4913 | ||
c8b97818 CM |
4914 | static noinline int uncompress_inline(struct btrfs_path *path, |
4915 | struct inode *inode, struct page *page, | |
4916 | size_t pg_offset, u64 extent_offset, | |
4917 | struct btrfs_file_extent_item *item) | |
4918 | { | |
4919 | int ret; | |
4920 | struct extent_buffer *leaf = path->nodes[0]; | |
4921 | char *tmp; | |
4922 | size_t max_size; | |
4923 | unsigned long inline_size; | |
4924 | unsigned long ptr; | |
261507a0 | 4925 | int compress_type; |
c8b97818 CM |
4926 | |
4927 | WARN_ON(pg_offset != 0); | |
261507a0 | 4928 | compress_type = btrfs_file_extent_compression(leaf, item); |
c8b97818 CM |
4929 | max_size = btrfs_file_extent_ram_bytes(leaf, item); |
4930 | inline_size = btrfs_file_extent_inline_item_len(leaf, | |
4931 | btrfs_item_nr(leaf, path->slots[0])); | |
4932 | tmp = kmalloc(inline_size, GFP_NOFS); | |
8d413713 TI |
4933 | if (!tmp) |
4934 | return -ENOMEM; | |
c8b97818 CM |
4935 | ptr = btrfs_file_extent_inline_start(item); |
4936 | ||
4937 | read_extent_buffer(leaf, tmp, ptr, inline_size); | |
4938 | ||
5b050f04 | 4939 | max_size = min_t(unsigned long, PAGE_CACHE_SIZE, max_size); |
261507a0 LZ |
4940 | ret = btrfs_decompress(compress_type, tmp, page, |
4941 | extent_offset, inline_size, max_size); | |
c8b97818 CM |
4942 | if (ret) { |
4943 | char *kaddr = kmap_atomic(page, KM_USER0); | |
4944 | unsigned long copy_size = min_t(u64, | |
4945 | PAGE_CACHE_SIZE - pg_offset, | |
4946 | max_size - extent_offset); | |
4947 | memset(kaddr + pg_offset, 0, copy_size); | |
4948 | kunmap_atomic(kaddr, KM_USER0); | |
4949 | } | |
4950 | kfree(tmp); | |
4951 | return 0; | |
4952 | } | |
4953 | ||
d352ac68 CM |
4954 | /* |
4955 | * a bit scary, this does extent mapping from logical file offset to the disk. | |
d397712b CM |
4956 | * the ugly parts come from merging extents from the disk with the in-ram |
4957 | * representation. This gets more complex because of the data=ordered code, | |
d352ac68 CM |
4958 | * where the in-ram extents might be locked pending data=ordered completion. |
4959 | * | |
4960 | * This also copies inline extents directly into the page. | |
4961 | */ | |
d397712b | 4962 | |
a52d9a80 | 4963 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 4964 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
4965 | int create) |
4966 | { | |
4967 | int ret; | |
4968 | int err = 0; | |
db94535d | 4969 | u64 bytenr; |
a52d9a80 CM |
4970 | u64 extent_start = 0; |
4971 | u64 extent_end = 0; | |
33345d01 | 4972 | u64 objectid = btrfs_ino(inode); |
a52d9a80 | 4973 | u32 found_type; |
f421950f | 4974 | struct btrfs_path *path = NULL; |
a52d9a80 CM |
4975 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4976 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
4977 | struct extent_buffer *leaf; |
4978 | struct btrfs_key found_key; | |
a52d9a80 CM |
4979 | struct extent_map *em = NULL; |
4980 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 4981 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 | 4982 | struct btrfs_trans_handle *trans = NULL; |
261507a0 | 4983 | int compress_type; |
a52d9a80 | 4984 | |
a52d9a80 | 4985 | again: |
890871be | 4986 | read_lock(&em_tree->lock); |
d1310b2e | 4987 | em = lookup_extent_mapping(em_tree, start, len); |
a061fc8d CM |
4988 | if (em) |
4989 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
890871be | 4990 | read_unlock(&em_tree->lock); |
d1310b2e | 4991 | |
a52d9a80 | 4992 | if (em) { |
e1c4b745 CM |
4993 | if (em->start > start || em->start + em->len <= start) |
4994 | free_extent_map(em); | |
4995 | else if (em->block_start == EXTENT_MAP_INLINE && page) | |
70dec807 CM |
4996 | free_extent_map(em); |
4997 | else | |
4998 | goto out; | |
a52d9a80 | 4999 | } |
172ddd60 | 5000 | em = alloc_extent_map(); |
a52d9a80 | 5001 | if (!em) { |
d1310b2e CM |
5002 | err = -ENOMEM; |
5003 | goto out; | |
a52d9a80 | 5004 | } |
e6dcd2dc | 5005 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
d1310b2e | 5006 | em->start = EXTENT_MAP_HOLE; |
445a6944 | 5007 | em->orig_start = EXTENT_MAP_HOLE; |
d1310b2e | 5008 | em->len = (u64)-1; |
c8b97818 | 5009 | em->block_len = (u64)-1; |
f421950f CM |
5010 | |
5011 | if (!path) { | |
5012 | path = btrfs_alloc_path(); | |
026fd317 JB |
5013 | if (!path) { |
5014 | err = -ENOMEM; | |
5015 | goto out; | |
5016 | } | |
5017 | /* | |
5018 | * Chances are we'll be called again, so go ahead and do | |
5019 | * readahead | |
5020 | */ | |
5021 | path->reada = 1; | |
f421950f CM |
5022 | } |
5023 | ||
179e29e4 CM |
5024 | ret = btrfs_lookup_file_extent(trans, root, path, |
5025 | objectid, start, trans != NULL); | |
a52d9a80 CM |
5026 | if (ret < 0) { |
5027 | err = ret; | |
5028 | goto out; | |
5029 | } | |
5030 | ||
5031 | if (ret != 0) { | |
5032 | if (path->slots[0] == 0) | |
5033 | goto not_found; | |
5034 | path->slots[0]--; | |
5035 | } | |
5036 | ||
5f39d397 CM |
5037 | leaf = path->nodes[0]; |
5038 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 5039 | struct btrfs_file_extent_item); |
a52d9a80 | 5040 | /* are we inside the extent that was found? */ |
5f39d397 CM |
5041 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
5042 | found_type = btrfs_key_type(&found_key); | |
5043 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
5044 | found_type != BTRFS_EXTENT_DATA_KEY) { |
5045 | goto not_found; | |
5046 | } | |
5047 | ||
5f39d397 CM |
5048 | found_type = btrfs_file_extent_type(leaf, item); |
5049 | extent_start = found_key.offset; | |
261507a0 | 5050 | compress_type = btrfs_file_extent_compression(leaf, item); |
d899e052 YZ |
5051 | if (found_type == BTRFS_FILE_EXTENT_REG || |
5052 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a52d9a80 | 5053 | extent_end = extent_start + |
db94535d | 5054 | btrfs_file_extent_num_bytes(leaf, item); |
9036c102 YZ |
5055 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
5056 | size_t size; | |
5057 | size = btrfs_file_extent_inline_len(leaf, item); | |
5058 | extent_end = (extent_start + size + root->sectorsize - 1) & | |
5059 | ~((u64)root->sectorsize - 1); | |
5060 | } | |
5061 | ||
5062 | if (start >= extent_end) { | |
5063 | path->slots[0]++; | |
5064 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
5065 | ret = btrfs_next_leaf(root, path); | |
5066 | if (ret < 0) { | |
5067 | err = ret; | |
5068 | goto out; | |
a52d9a80 | 5069 | } |
9036c102 YZ |
5070 | if (ret > 0) |
5071 | goto not_found; | |
5072 | leaf = path->nodes[0]; | |
a52d9a80 | 5073 | } |
9036c102 YZ |
5074 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
5075 | if (found_key.objectid != objectid || | |
5076 | found_key.type != BTRFS_EXTENT_DATA_KEY) | |
5077 | goto not_found; | |
5078 | if (start + len <= found_key.offset) | |
5079 | goto not_found; | |
5080 | em->start = start; | |
5081 | em->len = found_key.offset - start; | |
5082 | goto not_found_em; | |
5083 | } | |
5084 | ||
d899e052 YZ |
5085 | if (found_type == BTRFS_FILE_EXTENT_REG || |
5086 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
9036c102 YZ |
5087 | em->start = extent_start; |
5088 | em->len = extent_end - extent_start; | |
ff5b7ee3 YZ |
5089 | em->orig_start = extent_start - |
5090 | btrfs_file_extent_offset(leaf, item); | |
db94535d CM |
5091 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
5092 | if (bytenr == 0) { | |
5f39d397 | 5093 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
5094 | goto insert; |
5095 | } | |
261507a0 | 5096 | if (compress_type != BTRFS_COMPRESS_NONE) { |
c8b97818 | 5097 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
261507a0 | 5098 | em->compress_type = compress_type; |
c8b97818 CM |
5099 | em->block_start = bytenr; |
5100 | em->block_len = btrfs_file_extent_disk_num_bytes(leaf, | |
5101 | item); | |
5102 | } else { | |
5103 | bytenr += btrfs_file_extent_offset(leaf, item); | |
5104 | em->block_start = bytenr; | |
5105 | em->block_len = em->len; | |
d899e052 YZ |
5106 | if (found_type == BTRFS_FILE_EXTENT_PREALLOC) |
5107 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); | |
c8b97818 | 5108 | } |
a52d9a80 CM |
5109 | goto insert; |
5110 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 5111 | unsigned long ptr; |
a52d9a80 | 5112 | char *map; |
3326d1b0 CM |
5113 | size_t size; |
5114 | size_t extent_offset; | |
5115 | size_t copy_size; | |
a52d9a80 | 5116 | |
689f9346 | 5117 | em->block_start = EXTENT_MAP_INLINE; |
c8b97818 | 5118 | if (!page || create) { |
689f9346 | 5119 | em->start = extent_start; |
9036c102 | 5120 | em->len = extent_end - extent_start; |
689f9346 Y |
5121 | goto out; |
5122 | } | |
5f39d397 | 5123 | |
9036c102 YZ |
5124 | size = btrfs_file_extent_inline_len(leaf, item); |
5125 | extent_offset = page_offset(page) + pg_offset - extent_start; | |
70dec807 | 5126 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, |
3326d1b0 | 5127 | size - extent_offset); |
3326d1b0 | 5128 | em->start = extent_start + extent_offset; |
70dec807 CM |
5129 | em->len = (copy_size + root->sectorsize - 1) & |
5130 | ~((u64)root->sectorsize - 1); | |
ff5b7ee3 | 5131 | em->orig_start = EXTENT_MAP_INLINE; |
261507a0 | 5132 | if (compress_type) { |
c8b97818 | 5133 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
261507a0 LZ |
5134 | em->compress_type = compress_type; |
5135 | } | |
689f9346 | 5136 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; |
179e29e4 | 5137 | if (create == 0 && !PageUptodate(page)) { |
261507a0 LZ |
5138 | if (btrfs_file_extent_compression(leaf, item) != |
5139 | BTRFS_COMPRESS_NONE) { | |
c8b97818 CM |
5140 | ret = uncompress_inline(path, inode, page, |
5141 | pg_offset, | |
5142 | extent_offset, item); | |
5143 | BUG_ON(ret); | |
5144 | } else { | |
5145 | map = kmap(page); | |
5146 | read_extent_buffer(leaf, map + pg_offset, ptr, | |
5147 | copy_size); | |
93c82d57 CM |
5148 | if (pg_offset + copy_size < PAGE_CACHE_SIZE) { |
5149 | memset(map + pg_offset + copy_size, 0, | |
5150 | PAGE_CACHE_SIZE - pg_offset - | |
5151 | copy_size); | |
5152 | } | |
c8b97818 CM |
5153 | kunmap(page); |
5154 | } | |
179e29e4 CM |
5155 | flush_dcache_page(page); |
5156 | } else if (create && PageUptodate(page)) { | |
6bf7e080 | 5157 | BUG(); |
179e29e4 CM |
5158 | if (!trans) { |
5159 | kunmap(page); | |
5160 | free_extent_map(em); | |
5161 | em = NULL; | |
ff5714cc | 5162 | |
b3b4aa74 | 5163 | btrfs_release_path(path); |
7a7eaa40 | 5164 | trans = btrfs_join_transaction(root); |
ff5714cc | 5165 | |
3612b495 TI |
5166 | if (IS_ERR(trans)) |
5167 | return ERR_CAST(trans); | |
179e29e4 CM |
5168 | goto again; |
5169 | } | |
c8b97818 | 5170 | map = kmap(page); |
70dec807 | 5171 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 | 5172 | copy_size); |
c8b97818 | 5173 | kunmap(page); |
179e29e4 | 5174 | btrfs_mark_buffer_dirty(leaf); |
a52d9a80 | 5175 | } |
d1310b2e | 5176 | set_extent_uptodate(io_tree, em->start, |
507903b8 | 5177 | extent_map_end(em) - 1, NULL, GFP_NOFS); |
a52d9a80 CM |
5178 | goto insert; |
5179 | } else { | |
d397712b | 5180 | printk(KERN_ERR "btrfs unknown found_type %d\n", found_type); |
a52d9a80 CM |
5181 | WARN_ON(1); |
5182 | } | |
5183 | not_found: | |
5184 | em->start = start; | |
d1310b2e | 5185 | em->len = len; |
a52d9a80 | 5186 | not_found_em: |
5f39d397 | 5187 | em->block_start = EXTENT_MAP_HOLE; |
9036c102 | 5188 | set_bit(EXTENT_FLAG_VACANCY, &em->flags); |
a52d9a80 | 5189 | insert: |
b3b4aa74 | 5190 | btrfs_release_path(path); |
d1310b2e | 5191 | if (em->start > start || extent_map_end(em) <= start) { |
d397712b CM |
5192 | printk(KERN_ERR "Btrfs: bad extent! em: [%llu %llu] passed " |
5193 | "[%llu %llu]\n", (unsigned long long)em->start, | |
5194 | (unsigned long long)em->len, | |
5195 | (unsigned long long)start, | |
5196 | (unsigned long long)len); | |
a52d9a80 CM |
5197 | err = -EIO; |
5198 | goto out; | |
5199 | } | |
d1310b2e CM |
5200 | |
5201 | err = 0; | |
890871be | 5202 | write_lock(&em_tree->lock); |
a52d9a80 | 5203 | ret = add_extent_mapping(em_tree, em); |
3b951516 CM |
5204 | /* it is possible that someone inserted the extent into the tree |
5205 | * while we had the lock dropped. It is also possible that | |
5206 | * an overlapping map exists in the tree | |
5207 | */ | |
a52d9a80 | 5208 | if (ret == -EEXIST) { |
3b951516 | 5209 | struct extent_map *existing; |
e6dcd2dc CM |
5210 | |
5211 | ret = 0; | |
5212 | ||
3b951516 | 5213 | existing = lookup_extent_mapping(em_tree, start, len); |
e1c4b745 CM |
5214 | if (existing && (existing->start > start || |
5215 | existing->start + existing->len <= start)) { | |
5216 | free_extent_map(existing); | |
5217 | existing = NULL; | |
5218 | } | |
3b951516 CM |
5219 | if (!existing) { |
5220 | existing = lookup_extent_mapping(em_tree, em->start, | |
5221 | em->len); | |
5222 | if (existing) { | |
5223 | err = merge_extent_mapping(em_tree, existing, | |
e6dcd2dc CM |
5224 | em, start, |
5225 | root->sectorsize); | |
3b951516 CM |
5226 | free_extent_map(existing); |
5227 | if (err) { | |
5228 | free_extent_map(em); | |
5229 | em = NULL; | |
5230 | } | |
5231 | } else { | |
5232 | err = -EIO; | |
3b951516 CM |
5233 | free_extent_map(em); |
5234 | em = NULL; | |
5235 | } | |
5236 | } else { | |
5237 | free_extent_map(em); | |
5238 | em = existing; | |
e6dcd2dc | 5239 | err = 0; |
a52d9a80 | 5240 | } |
a52d9a80 | 5241 | } |
890871be | 5242 | write_unlock(&em_tree->lock); |
a52d9a80 | 5243 | out: |
1abe9b8a | 5244 | |
5245 | trace_btrfs_get_extent(root, em); | |
5246 | ||
f421950f CM |
5247 | if (path) |
5248 | btrfs_free_path(path); | |
a52d9a80 CM |
5249 | if (trans) { |
5250 | ret = btrfs_end_transaction(trans, root); | |
d397712b | 5251 | if (!err) |
a52d9a80 CM |
5252 | err = ret; |
5253 | } | |
a52d9a80 CM |
5254 | if (err) { |
5255 | free_extent_map(em); | |
a52d9a80 CM |
5256 | return ERR_PTR(err); |
5257 | } | |
5258 | return em; | |
5259 | } | |
5260 | ||
ec29ed5b CM |
5261 | struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page, |
5262 | size_t pg_offset, u64 start, u64 len, | |
5263 | int create) | |
5264 | { | |
5265 | struct extent_map *em; | |
5266 | struct extent_map *hole_em = NULL; | |
5267 | u64 range_start = start; | |
5268 | u64 end; | |
5269 | u64 found; | |
5270 | u64 found_end; | |
5271 | int err = 0; | |
5272 | ||
5273 | em = btrfs_get_extent(inode, page, pg_offset, start, len, create); | |
5274 | if (IS_ERR(em)) | |
5275 | return em; | |
5276 | if (em) { | |
5277 | /* | |
5278 | * if our em maps to a hole, there might | |
5279 | * actually be delalloc bytes behind it | |
5280 | */ | |
5281 | if (em->block_start != EXTENT_MAP_HOLE) | |
5282 | return em; | |
5283 | else | |
5284 | hole_em = em; | |
5285 | } | |
5286 | ||
5287 | /* check to see if we've wrapped (len == -1 or similar) */ | |
5288 | end = start + len; | |
5289 | if (end < start) | |
5290 | end = (u64)-1; | |
5291 | else | |
5292 | end -= 1; | |
5293 | ||
5294 | em = NULL; | |
5295 | ||
5296 | /* ok, we didn't find anything, lets look for delalloc */ | |
5297 | found = count_range_bits(&BTRFS_I(inode)->io_tree, &range_start, | |
5298 | end, len, EXTENT_DELALLOC, 1); | |
5299 | found_end = range_start + found; | |
5300 | if (found_end < range_start) | |
5301 | found_end = (u64)-1; | |
5302 | ||
5303 | /* | |
5304 | * we didn't find anything useful, return | |
5305 | * the original results from get_extent() | |
5306 | */ | |
5307 | if (range_start > end || found_end <= start) { | |
5308 | em = hole_em; | |
5309 | hole_em = NULL; | |
5310 | goto out; | |
5311 | } | |
5312 | ||
5313 | /* adjust the range_start to make sure it doesn't | |
5314 | * go backwards from the start they passed in | |
5315 | */ | |
5316 | range_start = max(start,range_start); | |
5317 | found = found_end - range_start; | |
5318 | ||
5319 | if (found > 0) { | |
5320 | u64 hole_start = start; | |
5321 | u64 hole_len = len; | |
5322 | ||
172ddd60 | 5323 | em = alloc_extent_map(); |
ec29ed5b CM |
5324 | if (!em) { |
5325 | err = -ENOMEM; | |
5326 | goto out; | |
5327 | } | |
5328 | /* | |
5329 | * when btrfs_get_extent can't find anything it | |
5330 | * returns one huge hole | |
5331 | * | |
5332 | * make sure what it found really fits our range, and | |
5333 | * adjust to make sure it is based on the start from | |
5334 | * the caller | |
5335 | */ | |
5336 | if (hole_em) { | |
5337 | u64 calc_end = extent_map_end(hole_em); | |
5338 | ||
5339 | if (calc_end <= start || (hole_em->start > end)) { | |
5340 | free_extent_map(hole_em); | |
5341 | hole_em = NULL; | |
5342 | } else { | |
5343 | hole_start = max(hole_em->start, start); | |
5344 | hole_len = calc_end - hole_start; | |
5345 | } | |
5346 | } | |
5347 | em->bdev = NULL; | |
5348 | if (hole_em && range_start > hole_start) { | |
5349 | /* our hole starts before our delalloc, so we | |
5350 | * have to return just the parts of the hole | |
5351 | * that go until the delalloc starts | |
5352 | */ | |
5353 | em->len = min(hole_len, | |
5354 | range_start - hole_start); | |
5355 | em->start = hole_start; | |
5356 | em->orig_start = hole_start; | |
5357 | /* | |
5358 | * don't adjust block start at all, | |
5359 | * it is fixed at EXTENT_MAP_HOLE | |
5360 | */ | |
5361 | em->block_start = hole_em->block_start; | |
5362 | em->block_len = hole_len; | |
5363 | } else { | |
5364 | em->start = range_start; | |
5365 | em->len = found; | |
5366 | em->orig_start = range_start; | |
5367 | em->block_start = EXTENT_MAP_DELALLOC; | |
5368 | em->block_len = found; | |
5369 | } | |
5370 | } else if (hole_em) { | |
5371 | return hole_em; | |
5372 | } | |
5373 | out: | |
5374 | ||
5375 | free_extent_map(hole_em); | |
5376 | if (err) { | |
5377 | free_extent_map(em); | |
5378 | return ERR_PTR(err); | |
5379 | } | |
5380 | return em; | |
5381 | } | |
5382 | ||
4b46fce2 | 5383 | static struct extent_map *btrfs_new_extent_direct(struct inode *inode, |
16d299ac | 5384 | struct extent_map *em, |
4b46fce2 JB |
5385 | u64 start, u64 len) |
5386 | { | |
5387 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5388 | struct btrfs_trans_handle *trans; | |
4b46fce2 JB |
5389 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
5390 | struct btrfs_key ins; | |
5391 | u64 alloc_hint; | |
5392 | int ret; | |
16d299ac | 5393 | bool insert = false; |
4b46fce2 | 5394 | |
16d299ac JB |
5395 | /* |
5396 | * Ok if the extent map we looked up is a hole and is for the exact | |
5397 | * range we want, there is no reason to allocate a new one, however if | |
5398 | * it is not right then we need to free this one and drop the cache for | |
5399 | * our range. | |
5400 | */ | |
5401 | if (em->block_start != EXTENT_MAP_HOLE || em->start != start || | |
5402 | em->len != len) { | |
5403 | free_extent_map(em); | |
5404 | em = NULL; | |
5405 | insert = true; | |
5406 | btrfs_drop_extent_cache(inode, start, start + len - 1, 0); | |
5407 | } | |
4b46fce2 | 5408 | |
7a7eaa40 | 5409 | trans = btrfs_join_transaction(root); |
3612b495 TI |
5410 | if (IS_ERR(trans)) |
5411 | return ERR_CAST(trans); | |
4b46fce2 | 5412 | |
4cb5300b CM |
5413 | if (start <= BTRFS_I(inode)->disk_i_size && len < 64 * 1024) |
5414 | btrfs_add_inode_defrag(trans, inode); | |
5415 | ||
4b46fce2 JB |
5416 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
5417 | ||
5418 | alloc_hint = get_extent_allocation_hint(inode, start, len); | |
5419 | ret = btrfs_reserve_extent(trans, root, len, root->sectorsize, 0, | |
5420 | alloc_hint, (u64)-1, &ins, 1); | |
5421 | if (ret) { | |
5422 | em = ERR_PTR(ret); | |
5423 | goto out; | |
5424 | } | |
5425 | ||
4b46fce2 | 5426 | if (!em) { |
172ddd60 | 5427 | em = alloc_extent_map(); |
16d299ac JB |
5428 | if (!em) { |
5429 | em = ERR_PTR(-ENOMEM); | |
5430 | goto out; | |
5431 | } | |
4b46fce2 JB |
5432 | } |
5433 | ||
5434 | em->start = start; | |
5435 | em->orig_start = em->start; | |
5436 | em->len = ins.offset; | |
5437 | ||
5438 | em->block_start = ins.objectid; | |
5439 | em->block_len = ins.offset; | |
5440 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
16d299ac JB |
5441 | |
5442 | /* | |
5443 | * We need to do this because if we're using the original em we searched | |
5444 | * for, we could have EXTENT_FLAG_VACANCY set, and we don't want that. | |
5445 | */ | |
5446 | em->flags = 0; | |
4b46fce2 JB |
5447 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
5448 | ||
16d299ac | 5449 | while (insert) { |
4b46fce2 JB |
5450 | write_lock(&em_tree->lock); |
5451 | ret = add_extent_mapping(em_tree, em); | |
5452 | write_unlock(&em_tree->lock); | |
5453 | if (ret != -EEXIST) | |
5454 | break; | |
5455 | btrfs_drop_extent_cache(inode, start, start + em->len - 1, 0); | |
5456 | } | |
5457 | ||
5458 | ret = btrfs_add_ordered_extent_dio(inode, start, ins.objectid, | |
5459 | ins.offset, ins.offset, 0); | |
5460 | if (ret) { | |
5461 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset); | |
5462 | em = ERR_PTR(ret); | |
5463 | } | |
5464 | out: | |
5465 | btrfs_end_transaction(trans, root); | |
5466 | return em; | |
5467 | } | |
5468 | ||
46bfbb5c CM |
5469 | /* |
5470 | * returns 1 when the nocow is safe, < 1 on error, 0 if the | |
5471 | * block must be cow'd | |
5472 | */ | |
5473 | static noinline int can_nocow_odirect(struct btrfs_trans_handle *trans, | |
5474 | struct inode *inode, u64 offset, u64 len) | |
5475 | { | |
5476 | struct btrfs_path *path; | |
5477 | int ret; | |
5478 | struct extent_buffer *leaf; | |
5479 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5480 | struct btrfs_file_extent_item *fi; | |
5481 | struct btrfs_key key; | |
5482 | u64 disk_bytenr; | |
5483 | u64 backref_offset; | |
5484 | u64 extent_end; | |
5485 | u64 num_bytes; | |
5486 | int slot; | |
5487 | int found_type; | |
5488 | ||
5489 | path = btrfs_alloc_path(); | |
5490 | if (!path) | |
5491 | return -ENOMEM; | |
5492 | ||
33345d01 | 5493 | ret = btrfs_lookup_file_extent(trans, root, path, btrfs_ino(inode), |
46bfbb5c CM |
5494 | offset, 0); |
5495 | if (ret < 0) | |
5496 | goto out; | |
5497 | ||
5498 | slot = path->slots[0]; | |
5499 | if (ret == 1) { | |
5500 | if (slot == 0) { | |
5501 | /* can't find the item, must cow */ | |
5502 | ret = 0; | |
5503 | goto out; | |
5504 | } | |
5505 | slot--; | |
5506 | } | |
5507 | ret = 0; | |
5508 | leaf = path->nodes[0]; | |
5509 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
33345d01 | 5510 | if (key.objectid != btrfs_ino(inode) || |
46bfbb5c CM |
5511 | key.type != BTRFS_EXTENT_DATA_KEY) { |
5512 | /* not our file or wrong item type, must cow */ | |
5513 | goto out; | |
5514 | } | |
5515 | ||
5516 | if (key.offset > offset) { | |
5517 | /* Wrong offset, must cow */ | |
5518 | goto out; | |
5519 | } | |
5520 | ||
5521 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
5522 | found_type = btrfs_file_extent_type(leaf, fi); | |
5523 | if (found_type != BTRFS_FILE_EXTENT_REG && | |
5524 | found_type != BTRFS_FILE_EXTENT_PREALLOC) { | |
5525 | /* not a regular extent, must cow */ | |
5526 | goto out; | |
5527 | } | |
5528 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
5529 | backref_offset = btrfs_file_extent_offset(leaf, fi); | |
5530 | ||
5531 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); | |
5532 | if (extent_end < offset + len) { | |
5533 | /* extent doesn't include our full range, must cow */ | |
5534 | goto out; | |
5535 | } | |
5536 | ||
5537 | if (btrfs_extent_readonly(root, disk_bytenr)) | |
5538 | goto out; | |
5539 | ||
5540 | /* | |
5541 | * look for other files referencing this extent, if we | |
5542 | * find any we must cow | |
5543 | */ | |
33345d01 | 5544 | if (btrfs_cross_ref_exist(trans, root, btrfs_ino(inode), |
46bfbb5c CM |
5545 | key.offset - backref_offset, disk_bytenr)) |
5546 | goto out; | |
5547 | ||
5548 | /* | |
5549 | * adjust disk_bytenr and num_bytes to cover just the bytes | |
5550 | * in this extent we are about to write. If there | |
5551 | * are any csums in that range we have to cow in order | |
5552 | * to keep the csums correct | |
5553 | */ | |
5554 | disk_bytenr += backref_offset; | |
5555 | disk_bytenr += offset - key.offset; | |
5556 | num_bytes = min(offset + len, extent_end) - offset; | |
5557 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) | |
5558 | goto out; | |
5559 | /* | |
5560 | * all of the above have passed, it is safe to overwrite this extent | |
5561 | * without cow | |
5562 | */ | |
5563 | ret = 1; | |
5564 | out: | |
5565 | btrfs_free_path(path); | |
5566 | return ret; | |
5567 | } | |
5568 | ||
4b46fce2 JB |
5569 | static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, |
5570 | struct buffer_head *bh_result, int create) | |
5571 | { | |
5572 | struct extent_map *em; | |
5573 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5574 | u64 start = iblock << inode->i_blkbits; | |
5575 | u64 len = bh_result->b_size; | |
46bfbb5c | 5576 | struct btrfs_trans_handle *trans; |
4b46fce2 JB |
5577 | |
5578 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
5579 | if (IS_ERR(em)) | |
5580 | return PTR_ERR(em); | |
5581 | ||
5582 | /* | |
5583 | * Ok for INLINE and COMPRESSED extents we need to fallback on buffered | |
5584 | * io. INLINE is special, and we could probably kludge it in here, but | |
5585 | * it's still buffered so for safety lets just fall back to the generic | |
5586 | * buffered path. | |
5587 | * | |
5588 | * For COMPRESSED we _have_ to read the entire extent in so we can | |
5589 | * decompress it, so there will be buffering required no matter what we | |
5590 | * do, so go ahead and fallback to buffered. | |
5591 | * | |
5592 | * We return -ENOTBLK because thats what makes DIO go ahead and go back | |
5593 | * to buffered IO. Don't blame me, this is the price we pay for using | |
5594 | * the generic code. | |
5595 | */ | |
5596 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) || | |
5597 | em->block_start == EXTENT_MAP_INLINE) { | |
5598 | free_extent_map(em); | |
5599 | return -ENOTBLK; | |
5600 | } | |
5601 | ||
5602 | /* Just a good old fashioned hole, return */ | |
5603 | if (!create && (em->block_start == EXTENT_MAP_HOLE || | |
5604 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { | |
5605 | free_extent_map(em); | |
5606 | /* DIO will do one hole at a time, so just unlock a sector */ | |
5607 | unlock_extent(&BTRFS_I(inode)->io_tree, start, | |
5608 | start + root->sectorsize - 1, GFP_NOFS); | |
5609 | return 0; | |
5610 | } | |
5611 | ||
5612 | /* | |
5613 | * We don't allocate a new extent in the following cases | |
5614 | * | |
5615 | * 1) The inode is marked as NODATACOW. In this case we'll just use the | |
5616 | * existing extent. | |
5617 | * 2) The extent is marked as PREALLOC. We're good to go here and can | |
5618 | * just use the extent. | |
5619 | * | |
5620 | */ | |
46bfbb5c CM |
5621 | if (!create) { |
5622 | len = em->len - (start - em->start); | |
4b46fce2 | 5623 | goto map; |
46bfbb5c | 5624 | } |
4b46fce2 JB |
5625 | |
5626 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) || | |
5627 | ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) && | |
5628 | em->block_start != EXTENT_MAP_HOLE)) { | |
4b46fce2 JB |
5629 | int type; |
5630 | int ret; | |
46bfbb5c | 5631 | u64 block_start; |
4b46fce2 JB |
5632 | |
5633 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
5634 | type = BTRFS_ORDERED_PREALLOC; | |
5635 | else | |
5636 | type = BTRFS_ORDERED_NOCOW; | |
46bfbb5c | 5637 | len = min(len, em->len - (start - em->start)); |
4b46fce2 | 5638 | block_start = em->block_start + (start - em->start); |
46bfbb5c CM |
5639 | |
5640 | /* | |
5641 | * we're not going to log anything, but we do need | |
5642 | * to make sure the current transaction stays open | |
5643 | * while we look for nocow cross refs | |
5644 | */ | |
7a7eaa40 | 5645 | trans = btrfs_join_transaction(root); |
3612b495 | 5646 | if (IS_ERR(trans)) |
46bfbb5c CM |
5647 | goto must_cow; |
5648 | ||
5649 | if (can_nocow_odirect(trans, inode, start, len) == 1) { | |
5650 | ret = btrfs_add_ordered_extent_dio(inode, start, | |
5651 | block_start, len, len, type); | |
5652 | btrfs_end_transaction(trans, root); | |
5653 | if (ret) { | |
5654 | free_extent_map(em); | |
5655 | return ret; | |
5656 | } | |
5657 | goto unlock; | |
4b46fce2 | 5658 | } |
46bfbb5c | 5659 | btrfs_end_transaction(trans, root); |
4b46fce2 | 5660 | } |
46bfbb5c CM |
5661 | must_cow: |
5662 | /* | |
5663 | * this will cow the extent, reset the len in case we changed | |
5664 | * it above | |
5665 | */ | |
5666 | len = bh_result->b_size; | |
16d299ac | 5667 | em = btrfs_new_extent_direct(inode, em, start, len); |
46bfbb5c CM |
5668 | if (IS_ERR(em)) |
5669 | return PTR_ERR(em); | |
5670 | len = min(len, em->len - (start - em->start)); | |
5671 | unlock: | |
4845e44f CM |
5672 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
5673 | EXTENT_LOCKED | EXTENT_DELALLOC | EXTENT_DIRTY, 1, | |
5674 | 0, NULL, GFP_NOFS); | |
4b46fce2 JB |
5675 | map: |
5676 | bh_result->b_blocknr = (em->block_start + (start - em->start)) >> | |
5677 | inode->i_blkbits; | |
46bfbb5c | 5678 | bh_result->b_size = len; |
4b46fce2 JB |
5679 | bh_result->b_bdev = em->bdev; |
5680 | set_buffer_mapped(bh_result); | |
5681 | if (create && !test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
5682 | set_buffer_new(bh_result); | |
5683 | ||
5684 | free_extent_map(em); | |
5685 | ||
5686 | return 0; | |
5687 | } | |
5688 | ||
5689 | struct btrfs_dio_private { | |
5690 | struct inode *inode; | |
5691 | u64 logical_offset; | |
5692 | u64 disk_bytenr; | |
5693 | u64 bytes; | |
5694 | u32 *csums; | |
5695 | void *private; | |
e65e1535 MX |
5696 | |
5697 | /* number of bios pending for this dio */ | |
5698 | atomic_t pending_bios; | |
5699 | ||
5700 | /* IO errors */ | |
5701 | int errors; | |
5702 | ||
5703 | struct bio *orig_bio; | |
4b46fce2 JB |
5704 | }; |
5705 | ||
5706 | static void btrfs_endio_direct_read(struct bio *bio, int err) | |
5707 | { | |
e65e1535 | 5708 | struct btrfs_dio_private *dip = bio->bi_private; |
4b46fce2 JB |
5709 | struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1; |
5710 | struct bio_vec *bvec = bio->bi_io_vec; | |
4b46fce2 JB |
5711 | struct inode *inode = dip->inode; |
5712 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5713 | u64 start; | |
5714 | u32 *private = dip->csums; | |
5715 | ||
5716 | start = dip->logical_offset; | |
5717 | do { | |
5718 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) { | |
5719 | struct page *page = bvec->bv_page; | |
5720 | char *kaddr; | |
5721 | u32 csum = ~(u32)0; | |
5722 | unsigned long flags; | |
5723 | ||
5724 | local_irq_save(flags); | |
5725 | kaddr = kmap_atomic(page, KM_IRQ0); | |
5726 | csum = btrfs_csum_data(root, kaddr + bvec->bv_offset, | |
5727 | csum, bvec->bv_len); | |
5728 | btrfs_csum_final(csum, (char *)&csum); | |
5729 | kunmap_atomic(kaddr, KM_IRQ0); | |
5730 | local_irq_restore(flags); | |
5731 | ||
5732 | flush_dcache_page(bvec->bv_page); | |
5733 | if (csum != *private) { | |
33345d01 | 5734 | printk(KERN_ERR "btrfs csum failed ino %llu off" |
4b46fce2 | 5735 | " %llu csum %u private %u\n", |
33345d01 LZ |
5736 | (unsigned long long)btrfs_ino(inode), |
5737 | (unsigned long long)start, | |
4b46fce2 JB |
5738 | csum, *private); |
5739 | err = -EIO; | |
5740 | } | |
5741 | } | |
5742 | ||
5743 | start += bvec->bv_len; | |
5744 | private++; | |
5745 | bvec++; | |
5746 | } while (bvec <= bvec_end); | |
5747 | ||
5748 | unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset, | |
5749 | dip->logical_offset + dip->bytes - 1, GFP_NOFS); | |
5750 | bio->bi_private = dip->private; | |
5751 | ||
5752 | kfree(dip->csums); | |
5753 | kfree(dip); | |
c0da7aa1 JB |
5754 | |
5755 | /* If we had a csum failure make sure to clear the uptodate flag */ | |
5756 | if (err) | |
5757 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
4b46fce2 JB |
5758 | dio_end_io(bio, err); |
5759 | } | |
5760 | ||
5761 | static void btrfs_endio_direct_write(struct bio *bio, int err) | |
5762 | { | |
5763 | struct btrfs_dio_private *dip = bio->bi_private; | |
5764 | struct inode *inode = dip->inode; | |
5765 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5766 | struct btrfs_trans_handle *trans; | |
5767 | struct btrfs_ordered_extent *ordered = NULL; | |
5768 | struct extent_state *cached_state = NULL; | |
163cf09c CM |
5769 | u64 ordered_offset = dip->logical_offset; |
5770 | u64 ordered_bytes = dip->bytes; | |
4b46fce2 JB |
5771 | int ret; |
5772 | ||
5773 | if (err) | |
5774 | goto out_done; | |
163cf09c CM |
5775 | again: |
5776 | ret = btrfs_dec_test_first_ordered_pending(inode, &ordered, | |
5777 | &ordered_offset, | |
5778 | ordered_bytes); | |
4b46fce2 | 5779 | if (!ret) |
163cf09c | 5780 | goto out_test; |
4b46fce2 JB |
5781 | |
5782 | BUG_ON(!ordered); | |
5783 | ||
7a7eaa40 | 5784 | trans = btrfs_join_transaction(root); |
3612b495 | 5785 | if (IS_ERR(trans)) { |
4b46fce2 JB |
5786 | err = -ENOMEM; |
5787 | goto out; | |
5788 | } | |
5789 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; | |
5790 | ||
5791 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags)) { | |
5792 | ret = btrfs_ordered_update_i_size(inode, 0, ordered); | |
5793 | if (!ret) | |
2115133f | 5794 | err = btrfs_update_inode_fallback(trans, root, inode); |
4b46fce2 JB |
5795 | goto out; |
5796 | } | |
5797 | ||
5798 | lock_extent_bits(&BTRFS_I(inode)->io_tree, ordered->file_offset, | |
5799 | ordered->file_offset + ordered->len - 1, 0, | |
5800 | &cached_state, GFP_NOFS); | |
5801 | ||
5802 | if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags)) { | |
5803 | ret = btrfs_mark_extent_written(trans, inode, | |
5804 | ordered->file_offset, | |
5805 | ordered->file_offset + | |
5806 | ordered->len); | |
5807 | if (ret) { | |
5808 | err = ret; | |
5809 | goto out_unlock; | |
5810 | } | |
5811 | } else { | |
5812 | ret = insert_reserved_file_extent(trans, inode, | |
5813 | ordered->file_offset, | |
5814 | ordered->start, | |
5815 | ordered->disk_len, | |
5816 | ordered->len, | |
5817 | ordered->len, | |
5818 | 0, 0, 0, | |
5819 | BTRFS_FILE_EXTENT_REG); | |
5820 | unpin_extent_cache(&BTRFS_I(inode)->extent_tree, | |
5821 | ordered->file_offset, ordered->len); | |
5822 | if (ret) { | |
5823 | err = ret; | |
5824 | WARN_ON(1); | |
5825 | goto out_unlock; | |
5826 | } | |
5827 | } | |
5828 | ||
5829 | add_pending_csums(trans, inode, ordered->file_offset, &ordered->list); | |
1ef30be1 | 5830 | ret = btrfs_ordered_update_i_size(inode, 0, ordered); |
a39f7521 | 5831 | if (!ret || !test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags)) |
2115133f | 5832 | btrfs_update_inode_fallback(trans, root, inode); |
1ef30be1 | 5833 | ret = 0; |
4b46fce2 JB |
5834 | out_unlock: |
5835 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, ordered->file_offset, | |
5836 | ordered->file_offset + ordered->len - 1, | |
5837 | &cached_state, GFP_NOFS); | |
5838 | out: | |
5839 | btrfs_delalloc_release_metadata(inode, ordered->len); | |
5840 | btrfs_end_transaction(trans, root); | |
163cf09c | 5841 | ordered_offset = ordered->file_offset + ordered->len; |
4b46fce2 JB |
5842 | btrfs_put_ordered_extent(ordered); |
5843 | btrfs_put_ordered_extent(ordered); | |
163cf09c CM |
5844 | |
5845 | out_test: | |
5846 | /* | |
5847 | * our bio might span multiple ordered extents. If we haven't | |
5848 | * completed the accounting for the whole dio, go back and try again | |
5849 | */ | |
5850 | if (ordered_offset < dip->logical_offset + dip->bytes) { | |
5851 | ordered_bytes = dip->logical_offset + dip->bytes - | |
5852 | ordered_offset; | |
5853 | goto again; | |
5854 | } | |
4b46fce2 JB |
5855 | out_done: |
5856 | bio->bi_private = dip->private; | |
5857 | ||
5858 | kfree(dip->csums); | |
5859 | kfree(dip); | |
c0da7aa1 JB |
5860 | |
5861 | /* If we had an error make sure to clear the uptodate flag */ | |
5862 | if (err) | |
5863 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
4b46fce2 JB |
5864 | dio_end_io(bio, err); |
5865 | } | |
5866 | ||
eaf25d93 CM |
5867 | static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw, |
5868 | struct bio *bio, int mirror_num, | |
5869 | unsigned long bio_flags, u64 offset) | |
5870 | { | |
5871 | int ret; | |
5872 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5873 | ret = btrfs_csum_one_bio(root, inode, bio, offset, 1); | |
5874 | BUG_ON(ret); | |
5875 | return 0; | |
5876 | } | |
5877 | ||
e65e1535 MX |
5878 | static void btrfs_end_dio_bio(struct bio *bio, int err) |
5879 | { | |
5880 | struct btrfs_dio_private *dip = bio->bi_private; | |
5881 | ||
5882 | if (err) { | |
33345d01 | 5883 | printk(KERN_ERR "btrfs direct IO failed ino %llu rw %lu " |
3dd1462e | 5884 | "sector %#Lx len %u err no %d\n", |
33345d01 | 5885 | (unsigned long long)btrfs_ino(dip->inode), bio->bi_rw, |
3dd1462e | 5886 | (unsigned long long)bio->bi_sector, bio->bi_size, err); |
e65e1535 MX |
5887 | dip->errors = 1; |
5888 | ||
5889 | /* | |
5890 | * before atomic variable goto zero, we must make sure | |
5891 | * dip->errors is perceived to be set. | |
5892 | */ | |
5893 | smp_mb__before_atomic_dec(); | |
5894 | } | |
5895 | ||
5896 | /* if there are more bios still pending for this dio, just exit */ | |
5897 | if (!atomic_dec_and_test(&dip->pending_bios)) | |
5898 | goto out; | |
5899 | ||
5900 | if (dip->errors) | |
5901 | bio_io_error(dip->orig_bio); | |
5902 | else { | |
5903 | set_bit(BIO_UPTODATE, &dip->orig_bio->bi_flags); | |
5904 | bio_endio(dip->orig_bio, 0); | |
5905 | } | |
5906 | out: | |
5907 | bio_put(bio); | |
5908 | } | |
5909 | ||
5910 | static struct bio *btrfs_dio_bio_alloc(struct block_device *bdev, | |
5911 | u64 first_sector, gfp_t gfp_flags) | |
5912 | { | |
5913 | int nr_vecs = bio_get_nr_vecs(bdev); | |
5914 | return btrfs_bio_alloc(bdev, first_sector, nr_vecs, gfp_flags); | |
5915 | } | |
5916 | ||
5917 | static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode, | |
5918 | int rw, u64 file_offset, int skip_sum, | |
1ae39938 | 5919 | u32 *csums, int async_submit) |
e65e1535 MX |
5920 | { |
5921 | int write = rw & REQ_WRITE; | |
5922 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5923 | int ret; | |
5924 | ||
5925 | bio_get(bio); | |
5926 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); | |
5927 | if (ret) | |
5928 | goto err; | |
5929 | ||
1ae39938 JB |
5930 | if (skip_sum) |
5931 | goto map; | |
5932 | ||
5933 | if (write && async_submit) { | |
e65e1535 MX |
5934 | ret = btrfs_wq_submit_bio(root->fs_info, |
5935 | inode, rw, bio, 0, 0, | |
5936 | file_offset, | |
5937 | __btrfs_submit_bio_start_direct_io, | |
5938 | __btrfs_submit_bio_done); | |
5939 | goto err; | |
1ae39938 JB |
5940 | } else if (write) { |
5941 | /* | |
5942 | * If we aren't doing async submit, calculate the csum of the | |
5943 | * bio now. | |
5944 | */ | |
5945 | ret = btrfs_csum_one_bio(root, inode, bio, file_offset, 1); | |
5946 | if (ret) | |
5947 | goto err; | |
c2db1073 TI |
5948 | } else if (!skip_sum) { |
5949 | ret = btrfs_lookup_bio_sums_dio(root, inode, bio, | |
e65e1535 | 5950 | file_offset, csums); |
c2db1073 TI |
5951 | if (ret) |
5952 | goto err; | |
5953 | } | |
e65e1535 | 5954 | |
1ae39938 JB |
5955 | map: |
5956 | ret = btrfs_map_bio(root, rw, bio, 0, async_submit); | |
e65e1535 MX |
5957 | err: |
5958 | bio_put(bio); | |
5959 | return ret; | |
5960 | } | |
5961 | ||
5962 | static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip, | |
5963 | int skip_sum) | |
5964 | { | |
5965 | struct inode *inode = dip->inode; | |
5966 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5967 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
5968 | struct bio *bio; | |
5969 | struct bio *orig_bio = dip->orig_bio; | |
5970 | struct bio_vec *bvec = orig_bio->bi_io_vec; | |
5971 | u64 start_sector = orig_bio->bi_sector; | |
5972 | u64 file_offset = dip->logical_offset; | |
5973 | u64 submit_len = 0; | |
5974 | u64 map_length; | |
5975 | int nr_pages = 0; | |
5976 | u32 *csums = dip->csums; | |
5977 | int ret = 0; | |
1ae39938 | 5978 | int async_submit = 0; |
98bc3149 | 5979 | int write = rw & REQ_WRITE; |
e65e1535 | 5980 | |
e65e1535 MX |
5981 | map_length = orig_bio->bi_size; |
5982 | ret = btrfs_map_block(map_tree, READ, start_sector << 9, | |
5983 | &map_length, NULL, 0); | |
5984 | if (ret) { | |
64728bbb | 5985 | bio_put(orig_bio); |
e65e1535 MX |
5986 | return -EIO; |
5987 | } | |
5988 | ||
02f57c7a JB |
5989 | if (map_length >= orig_bio->bi_size) { |
5990 | bio = orig_bio; | |
5991 | goto submit; | |
5992 | } | |
5993 | ||
1ae39938 | 5994 | async_submit = 1; |
02f57c7a JB |
5995 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS); |
5996 | if (!bio) | |
5997 | return -ENOMEM; | |
5998 | bio->bi_private = dip; | |
5999 | bio->bi_end_io = btrfs_end_dio_bio; | |
6000 | atomic_inc(&dip->pending_bios); | |
6001 | ||
e65e1535 MX |
6002 | while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) { |
6003 | if (unlikely(map_length < submit_len + bvec->bv_len || | |
6004 | bio_add_page(bio, bvec->bv_page, bvec->bv_len, | |
6005 | bvec->bv_offset) < bvec->bv_len)) { | |
6006 | /* | |
6007 | * inc the count before we submit the bio so | |
6008 | * we know the end IO handler won't happen before | |
6009 | * we inc the count. Otherwise, the dip might get freed | |
6010 | * before we're done setting it up | |
6011 | */ | |
6012 | atomic_inc(&dip->pending_bios); | |
6013 | ret = __btrfs_submit_dio_bio(bio, inode, rw, | |
6014 | file_offset, skip_sum, | |
1ae39938 | 6015 | csums, async_submit); |
e65e1535 MX |
6016 | if (ret) { |
6017 | bio_put(bio); | |
6018 | atomic_dec(&dip->pending_bios); | |
6019 | goto out_err; | |
6020 | } | |
6021 | ||
98bc3149 JB |
6022 | /* Write's use the ordered csums */ |
6023 | if (!write && !skip_sum) | |
e65e1535 MX |
6024 | csums = csums + nr_pages; |
6025 | start_sector += submit_len >> 9; | |
6026 | file_offset += submit_len; | |
6027 | ||
6028 | submit_len = 0; | |
6029 | nr_pages = 0; | |
6030 | ||
6031 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, | |
6032 | start_sector, GFP_NOFS); | |
6033 | if (!bio) | |
6034 | goto out_err; | |
6035 | bio->bi_private = dip; | |
6036 | bio->bi_end_io = btrfs_end_dio_bio; | |
6037 | ||
6038 | map_length = orig_bio->bi_size; | |
6039 | ret = btrfs_map_block(map_tree, READ, start_sector << 9, | |
6040 | &map_length, NULL, 0); | |
6041 | if (ret) { | |
6042 | bio_put(bio); | |
6043 | goto out_err; | |
6044 | } | |
6045 | } else { | |
6046 | submit_len += bvec->bv_len; | |
6047 | nr_pages ++; | |
6048 | bvec++; | |
6049 | } | |
6050 | } | |
6051 | ||
02f57c7a | 6052 | submit: |
e65e1535 | 6053 | ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum, |
1ae39938 | 6054 | csums, async_submit); |
e65e1535 MX |
6055 | if (!ret) |
6056 | return 0; | |
6057 | ||
6058 | bio_put(bio); | |
6059 | out_err: | |
6060 | dip->errors = 1; | |
6061 | /* | |
6062 | * before atomic variable goto zero, we must | |
6063 | * make sure dip->errors is perceived to be set. | |
6064 | */ | |
6065 | smp_mb__before_atomic_dec(); | |
6066 | if (atomic_dec_and_test(&dip->pending_bios)) | |
6067 | bio_io_error(dip->orig_bio); | |
6068 | ||
6069 | /* bio_end_io() will handle error, so we needn't return it */ | |
6070 | return 0; | |
6071 | } | |
6072 | ||
4b46fce2 JB |
6073 | static void btrfs_submit_direct(int rw, struct bio *bio, struct inode *inode, |
6074 | loff_t file_offset) | |
6075 | { | |
6076 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
6077 | struct btrfs_dio_private *dip; | |
6078 | struct bio_vec *bvec = bio->bi_io_vec; | |
4b46fce2 | 6079 | int skip_sum; |
7b6d91da | 6080 | int write = rw & REQ_WRITE; |
4b46fce2 JB |
6081 | int ret = 0; |
6082 | ||
6083 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; | |
6084 | ||
6085 | dip = kmalloc(sizeof(*dip), GFP_NOFS); | |
6086 | if (!dip) { | |
6087 | ret = -ENOMEM; | |
6088 | goto free_ordered; | |
6089 | } | |
6090 | dip->csums = NULL; | |
6091 | ||
98bc3149 JB |
6092 | /* Write's use the ordered csum stuff, so we don't need dip->csums */ |
6093 | if (!write && !skip_sum) { | |
4b46fce2 JB |
6094 | dip->csums = kmalloc(sizeof(u32) * bio->bi_vcnt, GFP_NOFS); |
6095 | if (!dip->csums) { | |
b4966b77 | 6096 | kfree(dip); |
4b46fce2 JB |
6097 | ret = -ENOMEM; |
6098 | goto free_ordered; | |
6099 | } | |
6100 | } | |
6101 | ||
6102 | dip->private = bio->bi_private; | |
6103 | dip->inode = inode; | |
6104 | dip->logical_offset = file_offset; | |
6105 | ||
4b46fce2 JB |
6106 | dip->bytes = 0; |
6107 | do { | |
6108 | dip->bytes += bvec->bv_len; | |
6109 | bvec++; | |
6110 | } while (bvec <= (bio->bi_io_vec + bio->bi_vcnt - 1)); | |
6111 | ||
46bfbb5c | 6112 | dip->disk_bytenr = (u64)bio->bi_sector << 9; |
4b46fce2 | 6113 | bio->bi_private = dip; |
e65e1535 MX |
6114 | dip->errors = 0; |
6115 | dip->orig_bio = bio; | |
6116 | atomic_set(&dip->pending_bios, 0); | |
4b46fce2 JB |
6117 | |
6118 | if (write) | |
6119 | bio->bi_end_io = btrfs_endio_direct_write; | |
6120 | else | |
6121 | bio->bi_end_io = btrfs_endio_direct_read; | |
6122 | ||
e65e1535 MX |
6123 | ret = btrfs_submit_direct_hook(rw, dip, skip_sum); |
6124 | if (!ret) | |
eaf25d93 | 6125 | return; |
4b46fce2 JB |
6126 | free_ordered: |
6127 | /* | |
6128 | * If this is a write, we need to clean up the reserved space and kill | |
6129 | * the ordered extent. | |
6130 | */ | |
6131 | if (write) { | |
6132 | struct btrfs_ordered_extent *ordered; | |
955256f2 | 6133 | ordered = btrfs_lookup_ordered_extent(inode, file_offset); |
4b46fce2 JB |
6134 | if (!test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags) && |
6135 | !test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags)) | |
6136 | btrfs_free_reserved_extent(root, ordered->start, | |
6137 | ordered->disk_len); | |
6138 | btrfs_put_ordered_extent(ordered); | |
6139 | btrfs_put_ordered_extent(ordered); | |
6140 | } | |
6141 | bio_endio(bio, ret); | |
6142 | } | |
6143 | ||
5a5f79b5 CM |
6144 | static ssize_t check_direct_IO(struct btrfs_root *root, int rw, struct kiocb *iocb, |
6145 | const struct iovec *iov, loff_t offset, | |
6146 | unsigned long nr_segs) | |
6147 | { | |
6148 | int seg; | |
a1b75f7d | 6149 | int i; |
5a5f79b5 CM |
6150 | size_t size; |
6151 | unsigned long addr; | |
6152 | unsigned blocksize_mask = root->sectorsize - 1; | |
6153 | ssize_t retval = -EINVAL; | |
6154 | loff_t end = offset; | |
6155 | ||
6156 | if (offset & blocksize_mask) | |
6157 | goto out; | |
6158 | ||
6159 | /* Check the memory alignment. Blocks cannot straddle pages */ | |
6160 | for (seg = 0; seg < nr_segs; seg++) { | |
6161 | addr = (unsigned long)iov[seg].iov_base; | |
6162 | size = iov[seg].iov_len; | |
6163 | end += size; | |
a1b75f7d | 6164 | if ((addr & blocksize_mask) || (size & blocksize_mask)) |
5a5f79b5 | 6165 | goto out; |
a1b75f7d JB |
6166 | |
6167 | /* If this is a write we don't need to check anymore */ | |
6168 | if (rw & WRITE) | |
6169 | continue; | |
6170 | ||
6171 | /* | |
6172 | * Check to make sure we don't have duplicate iov_base's in this | |
6173 | * iovec, if so return EINVAL, otherwise we'll get csum errors | |
6174 | * when reading back. | |
6175 | */ | |
6176 | for (i = seg + 1; i < nr_segs; i++) { | |
6177 | if (iov[seg].iov_base == iov[i].iov_base) | |
6178 | goto out; | |
6179 | } | |
5a5f79b5 CM |
6180 | } |
6181 | retval = 0; | |
6182 | out: | |
6183 | return retval; | |
6184 | } | |
16432985 CM |
6185 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, |
6186 | const struct iovec *iov, loff_t offset, | |
6187 | unsigned long nr_segs) | |
6188 | { | |
4b46fce2 JB |
6189 | struct file *file = iocb->ki_filp; |
6190 | struct inode *inode = file->f_mapping->host; | |
6191 | struct btrfs_ordered_extent *ordered; | |
4845e44f | 6192 | struct extent_state *cached_state = NULL; |
4b46fce2 JB |
6193 | u64 lockstart, lockend; |
6194 | ssize_t ret; | |
4845e44f CM |
6195 | int writing = rw & WRITE; |
6196 | int write_bits = 0; | |
3f7c579c | 6197 | size_t count = iov_length(iov, nr_segs); |
4b46fce2 | 6198 | |
5a5f79b5 CM |
6199 | if (check_direct_IO(BTRFS_I(inode)->root, rw, iocb, iov, |
6200 | offset, nr_segs)) { | |
6201 | return 0; | |
6202 | } | |
6203 | ||
4b46fce2 | 6204 | lockstart = offset; |
3f7c579c CM |
6205 | lockend = offset + count - 1; |
6206 | ||
6207 | if (writing) { | |
6208 | ret = btrfs_delalloc_reserve_space(inode, count); | |
6209 | if (ret) | |
6210 | goto out; | |
6211 | } | |
4845e44f | 6212 | |
4b46fce2 | 6213 | while (1) { |
4845e44f CM |
6214 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
6215 | 0, &cached_state, GFP_NOFS); | |
4b46fce2 JB |
6216 | /* |
6217 | * We're concerned with the entire range that we're going to be | |
6218 | * doing DIO to, so we need to make sure theres no ordered | |
6219 | * extents in this range. | |
6220 | */ | |
6221 | ordered = btrfs_lookup_ordered_range(inode, lockstart, | |
6222 | lockend - lockstart + 1); | |
6223 | if (!ordered) | |
6224 | break; | |
4845e44f CM |
6225 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
6226 | &cached_state, GFP_NOFS); | |
4b46fce2 JB |
6227 | btrfs_start_ordered_extent(inode, ordered, 1); |
6228 | btrfs_put_ordered_extent(ordered); | |
6229 | cond_resched(); | |
6230 | } | |
6231 | ||
4845e44f CM |
6232 | /* |
6233 | * we don't use btrfs_set_extent_delalloc because we don't want | |
6234 | * the dirty or uptodate bits | |
6235 | */ | |
6236 | if (writing) { | |
6237 | write_bits = EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING; | |
6238 | ret = set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
6239 | EXTENT_DELALLOC, 0, NULL, &cached_state, | |
6240 | GFP_NOFS); | |
6241 | if (ret) { | |
6242 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, | |
6243 | lockend, EXTENT_LOCKED | write_bits, | |
6244 | 1, 0, &cached_state, GFP_NOFS); | |
6245 | goto out; | |
6246 | } | |
6247 | } | |
6248 | ||
6249 | free_extent_state(cached_state); | |
6250 | cached_state = NULL; | |
6251 | ||
5a5f79b5 CM |
6252 | ret = __blockdev_direct_IO(rw, iocb, inode, |
6253 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev, | |
6254 | iov, offset, nr_segs, btrfs_get_blocks_direct, NULL, | |
6255 | btrfs_submit_direct, 0); | |
4b46fce2 JB |
6256 | |
6257 | if (ret < 0 && ret != -EIOCBQUEUED) { | |
4845e44f CM |
6258 | clear_extent_bit(&BTRFS_I(inode)->io_tree, offset, |
6259 | offset + iov_length(iov, nr_segs) - 1, | |
6260 | EXTENT_LOCKED | write_bits, 1, 0, | |
6261 | &cached_state, GFP_NOFS); | |
4b46fce2 JB |
6262 | } else if (ret >= 0 && ret < iov_length(iov, nr_segs)) { |
6263 | /* | |
6264 | * We're falling back to buffered, unlock the section we didn't | |
6265 | * do IO on. | |
6266 | */ | |
4845e44f CM |
6267 | clear_extent_bit(&BTRFS_I(inode)->io_tree, offset + ret, |
6268 | offset + iov_length(iov, nr_segs) - 1, | |
6269 | EXTENT_LOCKED | write_bits, 1, 0, | |
6270 | &cached_state, GFP_NOFS); | |
4b46fce2 | 6271 | } |
4845e44f CM |
6272 | out: |
6273 | free_extent_state(cached_state); | |
4b46fce2 | 6274 | return ret; |
16432985 CM |
6275 | } |
6276 | ||
1506fcc8 YS |
6277 | static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
6278 | __u64 start, __u64 len) | |
6279 | { | |
ec29ed5b | 6280 | return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent_fiemap); |
1506fcc8 YS |
6281 | } |
6282 | ||
a52d9a80 | 6283 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 6284 | { |
d1310b2e CM |
6285 | struct extent_io_tree *tree; |
6286 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
8ddc7d9c | 6287 | return extent_read_full_page(tree, page, btrfs_get_extent, 0); |
9ebefb18 | 6288 | } |
1832a6d5 | 6289 | |
a52d9a80 | 6290 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 6291 | { |
d1310b2e | 6292 | struct extent_io_tree *tree; |
b888db2b CM |
6293 | |
6294 | ||
6295 | if (current->flags & PF_MEMALLOC) { | |
6296 | redirty_page_for_writepage(wbc, page); | |
6297 | unlock_page(page); | |
6298 | return 0; | |
6299 | } | |
d1310b2e | 6300 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 6301 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
6302 | } |
6303 | ||
f421950f CM |
6304 | int btrfs_writepages(struct address_space *mapping, |
6305 | struct writeback_control *wbc) | |
b293f02e | 6306 | { |
d1310b2e | 6307 | struct extent_io_tree *tree; |
771ed689 | 6308 | |
d1310b2e | 6309 | tree = &BTRFS_I(mapping->host)->io_tree; |
b293f02e CM |
6310 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
6311 | } | |
6312 | ||
3ab2fb5a CM |
6313 | static int |
6314 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
6315 | struct list_head *pages, unsigned nr_pages) | |
6316 | { | |
d1310b2e CM |
6317 | struct extent_io_tree *tree; |
6318 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
6319 | return extent_readpages(tree, mapping, pages, nr_pages, |
6320 | btrfs_get_extent); | |
6321 | } | |
e6dcd2dc | 6322 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 6323 | { |
d1310b2e CM |
6324 | struct extent_io_tree *tree; |
6325 | struct extent_map_tree *map; | |
a52d9a80 | 6326 | int ret; |
8c2383c3 | 6327 | |
d1310b2e CM |
6328 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
6329 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 6330 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
6331 | if (ret == 1) { |
6332 | ClearPagePrivate(page); | |
6333 | set_page_private(page, 0); | |
6334 | page_cache_release(page); | |
39279cc3 | 6335 | } |
a52d9a80 | 6336 | return ret; |
39279cc3 CM |
6337 | } |
6338 | ||
e6dcd2dc CM |
6339 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
6340 | { | |
98509cfc CM |
6341 | if (PageWriteback(page) || PageDirty(page)) |
6342 | return 0; | |
b335b003 | 6343 | return __btrfs_releasepage(page, gfp_flags & GFP_NOFS); |
e6dcd2dc CM |
6344 | } |
6345 | ||
a52d9a80 | 6346 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 6347 | { |
d1310b2e | 6348 | struct extent_io_tree *tree; |
e6dcd2dc | 6349 | struct btrfs_ordered_extent *ordered; |
2ac55d41 | 6350 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
6351 | u64 page_start = page_offset(page); |
6352 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | |
39279cc3 | 6353 | |
8b62b72b CM |
6354 | |
6355 | /* | |
6356 | * we have the page locked, so new writeback can't start, | |
6357 | * and the dirty bit won't be cleared while we are here. | |
6358 | * | |
6359 | * Wait for IO on this page so that we can safely clear | |
6360 | * the PagePrivate2 bit and do ordered accounting | |
6361 | */ | |
e6dcd2dc | 6362 | wait_on_page_writeback(page); |
8b62b72b | 6363 | |
d1310b2e | 6364 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
e6dcd2dc CM |
6365 | if (offset) { |
6366 | btrfs_releasepage(page, GFP_NOFS); | |
6367 | return; | |
6368 | } | |
2ac55d41 JB |
6369 | lock_extent_bits(tree, page_start, page_end, 0, &cached_state, |
6370 | GFP_NOFS); | |
e6dcd2dc CM |
6371 | ordered = btrfs_lookup_ordered_extent(page->mapping->host, |
6372 | page_offset(page)); | |
6373 | if (ordered) { | |
eb84ae03 CM |
6374 | /* |
6375 | * IO on this page will never be started, so we need | |
6376 | * to account for any ordered extents now | |
6377 | */ | |
e6dcd2dc CM |
6378 | clear_extent_bit(tree, page_start, page_end, |
6379 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
32c00aff | 6380 | EXTENT_LOCKED | EXTENT_DO_ACCOUNTING, 1, 0, |
2ac55d41 | 6381 | &cached_state, GFP_NOFS); |
8b62b72b CM |
6382 | /* |
6383 | * whoever cleared the private bit is responsible | |
6384 | * for the finish_ordered_io | |
6385 | */ | |
6386 | if (TestClearPagePrivate2(page)) { | |
6387 | btrfs_finish_ordered_io(page->mapping->host, | |
6388 | page_start, page_end); | |
6389 | } | |
e6dcd2dc | 6390 | btrfs_put_ordered_extent(ordered); |
2ac55d41 JB |
6391 | cached_state = NULL; |
6392 | lock_extent_bits(tree, page_start, page_end, 0, &cached_state, | |
6393 | GFP_NOFS); | |
e6dcd2dc CM |
6394 | } |
6395 | clear_extent_bit(tree, page_start, page_end, | |
32c00aff | 6396 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
2ac55d41 | 6397 | EXTENT_DO_ACCOUNTING, 1, 1, &cached_state, GFP_NOFS); |
e6dcd2dc CM |
6398 | __btrfs_releasepage(page, GFP_NOFS); |
6399 | ||
4a096752 | 6400 | ClearPageChecked(page); |
9ad6b7bc | 6401 | if (PagePrivate(page)) { |
9ad6b7bc CM |
6402 | ClearPagePrivate(page); |
6403 | set_page_private(page, 0); | |
6404 | page_cache_release(page); | |
6405 | } | |
39279cc3 CM |
6406 | } |
6407 | ||
9ebefb18 CM |
6408 | /* |
6409 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
6410 | * called from a page fault handler when a page is first dirtied. Hence we must | |
6411 | * be careful to check for EOF conditions here. We set the page up correctly | |
6412 | * for a written page which means we get ENOSPC checking when writing into | |
6413 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
6414 | * support these features. | |
6415 | * | |
6416 | * We are not allowed to take the i_mutex here so we have to play games to | |
6417 | * protect against truncate races as the page could now be beyond EOF. Because | |
6418 | * vmtruncate() writes the inode size before removing pages, once we have the | |
6419 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
6420 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
6421 | * unlock the page. | |
6422 | */ | |
c2ec175c | 6423 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
9ebefb18 | 6424 | { |
c2ec175c | 6425 | struct page *page = vmf->page; |
6da6abae | 6426 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 6427 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
6428 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
6429 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 6430 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
6431 | char *kaddr; |
6432 | unsigned long zero_start; | |
9ebefb18 | 6433 | loff_t size; |
1832a6d5 | 6434 | int ret; |
9998eb70 | 6435 | int reserved = 0; |
a52d9a80 | 6436 | u64 page_start; |
e6dcd2dc | 6437 | u64 page_end; |
9ebefb18 | 6438 | |
0ca1f7ce | 6439 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
9998eb70 | 6440 | if (!ret) { |
22c44fe6 | 6441 | ret = btrfs_update_time(vma->vm_file); |
9998eb70 CM |
6442 | reserved = 1; |
6443 | } | |
56a76f82 NP |
6444 | if (ret) { |
6445 | if (ret == -ENOMEM) | |
6446 | ret = VM_FAULT_OOM; | |
6447 | else /* -ENOSPC, -EIO, etc */ | |
6448 | ret = VM_FAULT_SIGBUS; | |
9998eb70 CM |
6449 | if (reserved) |
6450 | goto out; | |
6451 | goto out_noreserve; | |
56a76f82 | 6452 | } |
1832a6d5 | 6453 | |
56a76f82 | 6454 | ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */ |
e6dcd2dc | 6455 | again: |
9ebefb18 | 6456 | lock_page(page); |
9ebefb18 | 6457 | size = i_size_read(inode); |
e6dcd2dc CM |
6458 | page_start = page_offset(page); |
6459 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
a52d9a80 | 6460 | |
9ebefb18 | 6461 | if ((page->mapping != inode->i_mapping) || |
e6dcd2dc | 6462 | (page_start >= size)) { |
9ebefb18 CM |
6463 | /* page got truncated out from underneath us */ |
6464 | goto out_unlock; | |
6465 | } | |
e6dcd2dc CM |
6466 | wait_on_page_writeback(page); |
6467 | ||
2ac55d41 JB |
6468 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state, |
6469 | GFP_NOFS); | |
e6dcd2dc CM |
6470 | set_page_extent_mapped(page); |
6471 | ||
eb84ae03 CM |
6472 | /* |
6473 | * we can't set the delalloc bits if there are pending ordered | |
6474 | * extents. Drop our locks and wait for them to finish | |
6475 | */ | |
e6dcd2dc CM |
6476 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
6477 | if (ordered) { | |
2ac55d41 JB |
6478 | unlock_extent_cached(io_tree, page_start, page_end, |
6479 | &cached_state, GFP_NOFS); | |
e6dcd2dc | 6480 | unlock_page(page); |
eb84ae03 | 6481 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
6482 | btrfs_put_ordered_extent(ordered); |
6483 | goto again; | |
6484 | } | |
6485 | ||
fbf19087 JB |
6486 | /* |
6487 | * XXX - page_mkwrite gets called every time the page is dirtied, even | |
6488 | * if it was already dirty, so for space accounting reasons we need to | |
6489 | * clear any delalloc bits for the range we are fixing to save. There | |
6490 | * is probably a better way to do this, but for now keep consistent with | |
6491 | * prepare_pages in the normal write path. | |
6492 | */ | |
2ac55d41 | 6493 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
32c00aff | 6494 | EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING, |
2ac55d41 | 6495 | 0, 0, &cached_state, GFP_NOFS); |
fbf19087 | 6496 | |
2ac55d41 JB |
6497 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
6498 | &cached_state); | |
9ed74f2d | 6499 | if (ret) { |
2ac55d41 JB |
6500 | unlock_extent_cached(io_tree, page_start, page_end, |
6501 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
6502 | ret = VM_FAULT_SIGBUS; |
6503 | goto out_unlock; | |
6504 | } | |
e6dcd2dc | 6505 | ret = 0; |
9ebefb18 CM |
6506 | |
6507 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 6508 | if (page_start + PAGE_CACHE_SIZE > size) |
e6dcd2dc | 6509 | zero_start = size & ~PAGE_CACHE_MASK; |
9ebefb18 | 6510 | else |
e6dcd2dc | 6511 | zero_start = PAGE_CACHE_SIZE; |
9ebefb18 | 6512 | |
e6dcd2dc CM |
6513 | if (zero_start != PAGE_CACHE_SIZE) { |
6514 | kaddr = kmap(page); | |
6515 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); | |
6516 | flush_dcache_page(page); | |
6517 | kunmap(page); | |
6518 | } | |
247e743c | 6519 | ClearPageChecked(page); |
e6dcd2dc | 6520 | set_page_dirty(page); |
50a9b214 | 6521 | SetPageUptodate(page); |
5a3f23d5 | 6522 | |
257c62e1 CM |
6523 | BTRFS_I(inode)->last_trans = root->fs_info->generation; |
6524 | BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; | |
6525 | ||
2ac55d41 | 6526 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, GFP_NOFS); |
9ebefb18 CM |
6527 | |
6528 | out_unlock: | |
50a9b214 CM |
6529 | if (!ret) |
6530 | return VM_FAULT_LOCKED; | |
9ebefb18 | 6531 | unlock_page(page); |
1832a6d5 | 6532 | out: |
ec39e180 | 6533 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
9998eb70 | 6534 | out_noreserve: |
9ebefb18 CM |
6535 | return ret; |
6536 | } | |
6537 | ||
a41ad394 | 6538 | static int btrfs_truncate(struct inode *inode) |
39279cc3 CM |
6539 | { |
6540 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
fcb80c2a | 6541 | struct btrfs_block_rsv *rsv; |
39279cc3 | 6542 | int ret; |
3893e33b | 6543 | int err = 0; |
39279cc3 | 6544 | struct btrfs_trans_handle *trans; |
d3c2fdcf | 6545 | unsigned long nr; |
dbe674a9 | 6546 | u64 mask = root->sectorsize - 1; |
07127184 | 6547 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
39279cc3 | 6548 | |
5d5e103a JB |
6549 | ret = btrfs_truncate_page(inode->i_mapping, inode->i_size); |
6550 | if (ret) | |
a41ad394 | 6551 | return ret; |
8082510e | 6552 | |
4a096752 | 6553 | btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1); |
8082510e | 6554 | btrfs_ordered_update_i_size(inode, inode->i_size, NULL); |
39279cc3 | 6555 | |
fcb80c2a JB |
6556 | /* |
6557 | * Yes ladies and gentelment, this is indeed ugly. The fact is we have | |
6558 | * 3 things going on here | |
6559 | * | |
6560 | * 1) We need to reserve space for our orphan item and the space to | |
6561 | * delete our orphan item. Lord knows we don't want to have a dangling | |
6562 | * orphan item because we didn't reserve space to remove it. | |
6563 | * | |
6564 | * 2) We need to reserve space to update our inode. | |
6565 | * | |
6566 | * 3) We need to have something to cache all the space that is going to | |
6567 | * be free'd up by the truncate operation, but also have some slack | |
6568 | * space reserved in case it uses space during the truncate (thank you | |
6569 | * very much snapshotting). | |
6570 | * | |
6571 | * And we need these to all be seperate. The fact is we can use alot of | |
6572 | * space doing the truncate, and we have no earthly idea how much space | |
6573 | * we will use, so we need the truncate reservation to be seperate so it | |
6574 | * doesn't end up using space reserved for updating the inode or | |
6575 | * removing the orphan item. We also need to be able to stop the | |
6576 | * transaction and start a new one, which means we need to be able to | |
6577 | * update the inode several times, and we have no idea of knowing how | |
6578 | * many times that will be, so we can't just reserve 1 item for the | |
6579 | * entirety of the opration, so that has to be done seperately as well. | |
6580 | * Then there is the orphan item, which does indeed need to be held on | |
6581 | * to for the whole operation, and we need nobody to touch this reserved | |
6582 | * space except the orphan code. | |
6583 | * | |
6584 | * So that leaves us with | |
6585 | * | |
6586 | * 1) root->orphan_block_rsv - for the orphan deletion. | |
6587 | * 2) rsv - for the truncate reservation, which we will steal from the | |
6588 | * transaction reservation. | |
6589 | * 3) fs_info->trans_block_rsv - this will have 1 items worth left for | |
6590 | * updating the inode. | |
6591 | */ | |
6592 | rsv = btrfs_alloc_block_rsv(root); | |
6593 | if (!rsv) | |
6594 | return -ENOMEM; | |
4a338542 | 6595 | rsv->size = min_size; |
f0cd846e | 6596 | |
907cbceb | 6597 | /* |
07127184 | 6598 | * 1 for the truncate slack space |
907cbceb JB |
6599 | * 1 for the orphan item we're going to add |
6600 | * 1 for the orphan item deletion | |
6601 | * 1 for updating the inode. | |
6602 | */ | |
fcb80c2a JB |
6603 | trans = btrfs_start_transaction(root, 4); |
6604 | if (IS_ERR(trans)) { | |
6605 | err = PTR_ERR(trans); | |
6606 | goto out; | |
6607 | } | |
f0cd846e | 6608 | |
907cbceb JB |
6609 | /* Migrate the slack space for the truncate to our reserve */ |
6610 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv, | |
6611 | min_size); | |
fcb80c2a | 6612 | BUG_ON(ret); |
f0cd846e JB |
6613 | |
6614 | ret = btrfs_orphan_add(trans, inode); | |
6615 | if (ret) { | |
6616 | btrfs_end_transaction(trans, root); | |
fcb80c2a | 6617 | goto out; |
f0cd846e JB |
6618 | } |
6619 | ||
5a3f23d5 CM |
6620 | /* |
6621 | * setattr is responsible for setting the ordered_data_close flag, | |
6622 | * but that is only tested during the last file release. That | |
6623 | * could happen well after the next commit, leaving a great big | |
6624 | * window where new writes may get lost if someone chooses to write | |
6625 | * to this file after truncating to zero | |
6626 | * | |
6627 | * The inode doesn't have any dirty data here, and so if we commit | |
6628 | * this is a noop. If someone immediately starts writing to the inode | |
6629 | * it is very likely we'll catch some of their writes in this | |
6630 | * transaction, and the commit will find this file on the ordered | |
6631 | * data list with good things to send down. | |
6632 | * | |
6633 | * This is a best effort solution, there is still a window where | |
6634 | * using truncate to replace the contents of the file will | |
6635 | * end up with a zero length file after a crash. | |
6636 | */ | |
6637 | if (inode->i_size == 0 && BTRFS_I(inode)->ordered_data_close) | |
6638 | btrfs_add_ordered_operation(trans, root, inode); | |
6639 | ||
8082510e | 6640 | while (1) { |
36ba022a | 6641 | ret = btrfs_block_rsv_refill(root, rsv, min_size); |
907cbceb JB |
6642 | if (ret) { |
6643 | /* | |
6644 | * This can only happen with the original transaction we | |
6645 | * started above, every other time we shouldn't have a | |
6646 | * transaction started yet. | |
6647 | */ | |
6648 | if (ret == -EAGAIN) | |
6649 | goto end_trans; | |
6650 | err = ret; | |
6651 | break; | |
6652 | } | |
6653 | ||
d68fc57b | 6654 | if (!trans) { |
907cbceb JB |
6655 | /* Just need the 1 for updating the inode */ |
6656 | trans = btrfs_start_transaction(root, 1); | |
fcb80c2a | 6657 | if (IS_ERR(trans)) { |
7041ee97 JB |
6658 | ret = err = PTR_ERR(trans); |
6659 | trans = NULL; | |
6660 | break; | |
fcb80c2a | 6661 | } |
d68fc57b YZ |
6662 | } |
6663 | ||
907cbceb JB |
6664 | trans->block_rsv = rsv; |
6665 | ||
8082510e YZ |
6666 | ret = btrfs_truncate_inode_items(trans, root, inode, |
6667 | inode->i_size, | |
6668 | BTRFS_EXTENT_DATA_KEY); | |
3893e33b JB |
6669 | if (ret != -EAGAIN) { |
6670 | err = ret; | |
8082510e | 6671 | break; |
3893e33b | 6672 | } |
39279cc3 | 6673 | |
fcb80c2a | 6674 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
8082510e | 6675 | ret = btrfs_update_inode(trans, root, inode); |
3893e33b JB |
6676 | if (ret) { |
6677 | err = ret; | |
6678 | break; | |
6679 | } | |
907cbceb | 6680 | end_trans: |
8082510e YZ |
6681 | nr = trans->blocks_used; |
6682 | btrfs_end_transaction(trans, root); | |
d68fc57b | 6683 | trans = NULL; |
8082510e | 6684 | btrfs_btree_balance_dirty(root, nr); |
8082510e YZ |
6685 | } |
6686 | ||
6687 | if (ret == 0 && inode->i_nlink > 0) { | |
fcb80c2a | 6688 | trans->block_rsv = root->orphan_block_rsv; |
8082510e | 6689 | ret = btrfs_orphan_del(trans, inode); |
3893e33b JB |
6690 | if (ret) |
6691 | err = ret; | |
ded5db9d JB |
6692 | } else if (ret && inode->i_nlink > 0) { |
6693 | /* | |
6694 | * Failed to do the truncate, remove us from the in memory | |
6695 | * orphan list. | |
6696 | */ | |
6697 | ret = btrfs_orphan_del(NULL, inode); | |
8082510e YZ |
6698 | } |
6699 | ||
917c16b2 CM |
6700 | if (trans) { |
6701 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
6702 | ret = btrfs_update_inode(trans, root, inode); | |
6703 | if (ret && !err) | |
6704 | err = ret; | |
7b128766 | 6705 | |
917c16b2 | 6706 | nr = trans->blocks_used; |
7ad85bb7 | 6707 | ret = btrfs_end_transaction(trans, root); |
917c16b2 CM |
6708 | btrfs_btree_balance_dirty(root, nr); |
6709 | } | |
fcb80c2a JB |
6710 | |
6711 | out: | |
6712 | btrfs_free_block_rsv(root, rsv); | |
6713 | ||
3893e33b JB |
6714 | if (ret && !err) |
6715 | err = ret; | |
a41ad394 | 6716 | |
3893e33b | 6717 | return err; |
39279cc3 CM |
6718 | } |
6719 | ||
d352ac68 CM |
6720 | /* |
6721 | * create a new subvolume directory/inode (helper for the ioctl). | |
6722 | */ | |
d2fb3437 | 6723 | int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, |
d82a6f1d | 6724 | struct btrfs_root *new_root, u64 new_dirid) |
39279cc3 | 6725 | { |
39279cc3 | 6726 | struct inode *inode; |
76dda93c | 6727 | int err; |
00e4e6b3 | 6728 | u64 index = 0; |
39279cc3 | 6729 | |
12fc9d09 FA |
6730 | inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, |
6731 | new_dirid, new_dirid, | |
6732 | S_IFDIR | (~current_umask() & S_IRWXUGO), | |
6733 | &index); | |
54aa1f4d | 6734 | if (IS_ERR(inode)) |
f46b5a66 | 6735 | return PTR_ERR(inode); |
39279cc3 CM |
6736 | inode->i_op = &btrfs_dir_inode_operations; |
6737 | inode->i_fop = &btrfs_dir_file_operations; | |
6738 | ||
bfe86848 | 6739 | set_nlink(inode, 1); |
dbe674a9 | 6740 | btrfs_i_size_write(inode, 0); |
3b96362c | 6741 | |
76dda93c YZ |
6742 | err = btrfs_update_inode(trans, new_root, inode); |
6743 | BUG_ON(err); | |
cb8e7090 | 6744 | |
76dda93c | 6745 | iput(inode); |
cb8e7090 | 6746 | return 0; |
39279cc3 CM |
6747 | } |
6748 | ||
39279cc3 CM |
6749 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
6750 | { | |
6751 | struct btrfs_inode *ei; | |
2ead6ae7 | 6752 | struct inode *inode; |
39279cc3 CM |
6753 | |
6754 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
6755 | if (!ei) | |
6756 | return NULL; | |
2ead6ae7 YZ |
6757 | |
6758 | ei->root = NULL; | |
6759 | ei->space_info = NULL; | |
6760 | ei->generation = 0; | |
6761 | ei->sequence = 0; | |
15ee9bc7 | 6762 | ei->last_trans = 0; |
257c62e1 | 6763 | ei->last_sub_trans = 0; |
e02119d5 | 6764 | ei->logged_trans = 0; |
2ead6ae7 | 6765 | ei->delalloc_bytes = 0; |
2ead6ae7 YZ |
6766 | ei->disk_i_size = 0; |
6767 | ei->flags = 0; | |
7709cde3 | 6768 | ei->csum_bytes = 0; |
2ead6ae7 YZ |
6769 | ei->index_cnt = (u64)-1; |
6770 | ei->last_unlink_trans = 0; | |
6771 | ||
9e0baf60 JB |
6772 | spin_lock_init(&ei->lock); |
6773 | ei->outstanding_extents = 0; | |
6774 | ei->reserved_extents = 0; | |
2ead6ae7 YZ |
6775 | |
6776 | ei->ordered_data_close = 0; | |
d68fc57b | 6777 | ei->orphan_meta_reserved = 0; |
2ead6ae7 | 6778 | ei->dummy_inode = 0; |
4cb5300b | 6779 | ei->in_defrag = 0; |
7fd2ae21 | 6780 | ei->delalloc_meta_reserved = 0; |
261507a0 | 6781 | ei->force_compress = BTRFS_COMPRESS_NONE; |
2ead6ae7 | 6782 | |
16cdcec7 MX |
6783 | ei->delayed_node = NULL; |
6784 | ||
2ead6ae7 | 6785 | inode = &ei->vfs_inode; |
a8067e02 | 6786 | extent_map_tree_init(&ei->extent_tree); |
f993c883 DS |
6787 | extent_io_tree_init(&ei->io_tree, &inode->i_data); |
6788 | extent_io_tree_init(&ei->io_failure_tree, &inode->i_data); | |
2ead6ae7 | 6789 | mutex_init(&ei->log_mutex); |
f248679e | 6790 | mutex_init(&ei->delalloc_mutex); |
e6dcd2dc | 6791 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
7b128766 | 6792 | INIT_LIST_HEAD(&ei->i_orphan); |
2ead6ae7 | 6793 | INIT_LIST_HEAD(&ei->delalloc_inodes); |
5a3f23d5 | 6794 | INIT_LIST_HEAD(&ei->ordered_operations); |
2ead6ae7 YZ |
6795 | RB_CLEAR_NODE(&ei->rb_node); |
6796 | ||
6797 | return inode; | |
39279cc3 CM |
6798 | } |
6799 | ||
fa0d7e3d NP |
6800 | static void btrfs_i_callback(struct rcu_head *head) |
6801 | { | |
6802 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
6803 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
6804 | } | |
6805 | ||
39279cc3 CM |
6806 | void btrfs_destroy_inode(struct inode *inode) |
6807 | { | |
e6dcd2dc | 6808 | struct btrfs_ordered_extent *ordered; |
5a3f23d5 CM |
6809 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6810 | ||
39279cc3 CM |
6811 | WARN_ON(!list_empty(&inode->i_dentry)); |
6812 | WARN_ON(inode->i_data.nrpages); | |
9e0baf60 JB |
6813 | WARN_ON(BTRFS_I(inode)->outstanding_extents); |
6814 | WARN_ON(BTRFS_I(inode)->reserved_extents); | |
7709cde3 JB |
6815 | WARN_ON(BTRFS_I(inode)->delalloc_bytes); |
6816 | WARN_ON(BTRFS_I(inode)->csum_bytes); | |
39279cc3 | 6817 | |
a6dbd429 JB |
6818 | /* |
6819 | * This can happen where we create an inode, but somebody else also | |
6820 | * created the same inode and we need to destroy the one we already | |
6821 | * created. | |
6822 | */ | |
6823 | if (!root) | |
6824 | goto free; | |
6825 | ||
5a3f23d5 CM |
6826 | /* |
6827 | * Make sure we're properly removed from the ordered operation | |
6828 | * lists. | |
6829 | */ | |
6830 | smp_mb(); | |
6831 | if (!list_empty(&BTRFS_I(inode)->ordered_operations)) { | |
6832 | spin_lock(&root->fs_info->ordered_extent_lock); | |
6833 | list_del_init(&BTRFS_I(inode)->ordered_operations); | |
6834 | spin_unlock(&root->fs_info->ordered_extent_lock); | |
6835 | } | |
6836 | ||
d68fc57b | 6837 | spin_lock(&root->orphan_lock); |
7b128766 | 6838 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { |
33345d01 LZ |
6839 | printk(KERN_INFO "BTRFS: inode %llu still on the orphan list\n", |
6840 | (unsigned long long)btrfs_ino(inode)); | |
8082510e | 6841 | list_del_init(&BTRFS_I(inode)->i_orphan); |
7b128766 | 6842 | } |
d68fc57b | 6843 | spin_unlock(&root->orphan_lock); |
7b128766 | 6844 | |
d397712b | 6845 | while (1) { |
e6dcd2dc CM |
6846 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); |
6847 | if (!ordered) | |
6848 | break; | |
6849 | else { | |
d397712b CM |
6850 | printk(KERN_ERR "btrfs found ordered " |
6851 | "extent %llu %llu on inode cleanup\n", | |
6852 | (unsigned long long)ordered->file_offset, | |
6853 | (unsigned long long)ordered->len); | |
e6dcd2dc CM |
6854 | btrfs_remove_ordered_extent(inode, ordered); |
6855 | btrfs_put_ordered_extent(ordered); | |
6856 | btrfs_put_ordered_extent(ordered); | |
6857 | } | |
6858 | } | |
5d4f98a2 | 6859 | inode_tree_del(inode); |
5b21f2ed | 6860 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); |
a6dbd429 | 6861 | free: |
16cdcec7 | 6862 | btrfs_remove_delayed_node(inode); |
fa0d7e3d | 6863 | call_rcu(&inode->i_rcu, btrfs_i_callback); |
39279cc3 CM |
6864 | } |
6865 | ||
45321ac5 | 6866 | int btrfs_drop_inode(struct inode *inode) |
76dda93c YZ |
6867 | { |
6868 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
45321ac5 | 6869 | |
0af3d00b | 6870 | if (btrfs_root_refs(&root->root_item) == 0 && |
2cf8572d | 6871 | !btrfs_is_free_space_inode(root, inode)) |
45321ac5 | 6872 | return 1; |
76dda93c | 6873 | else |
45321ac5 | 6874 | return generic_drop_inode(inode); |
76dda93c YZ |
6875 | } |
6876 | ||
0ee0fda0 | 6877 | static void init_once(void *foo) |
39279cc3 CM |
6878 | { |
6879 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
6880 | ||
6881 | inode_init_once(&ei->vfs_inode); | |
6882 | } | |
6883 | ||
6884 | void btrfs_destroy_cachep(void) | |
6885 | { | |
6886 | if (btrfs_inode_cachep) | |
6887 | kmem_cache_destroy(btrfs_inode_cachep); | |
6888 | if (btrfs_trans_handle_cachep) | |
6889 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
6890 | if (btrfs_transaction_cachep) | |
6891 | kmem_cache_destroy(btrfs_transaction_cachep); | |
39279cc3 CM |
6892 | if (btrfs_path_cachep) |
6893 | kmem_cache_destroy(btrfs_path_cachep); | |
dc89e982 JB |
6894 | if (btrfs_free_space_cachep) |
6895 | kmem_cache_destroy(btrfs_free_space_cachep); | |
39279cc3 CM |
6896 | } |
6897 | ||
6898 | int btrfs_init_cachep(void) | |
6899 | { | |
9601e3f6 CH |
6900 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", |
6901 | sizeof(struct btrfs_inode), 0, | |
6902 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, init_once); | |
39279cc3 CM |
6903 | if (!btrfs_inode_cachep) |
6904 | goto fail; | |
9601e3f6 CH |
6905 | |
6906 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", | |
6907 | sizeof(struct btrfs_trans_handle), 0, | |
6908 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
6909 | if (!btrfs_trans_handle_cachep) |
6910 | goto fail; | |
9601e3f6 CH |
6911 | |
6912 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", | |
6913 | sizeof(struct btrfs_transaction), 0, | |
6914 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
6915 | if (!btrfs_transaction_cachep) |
6916 | goto fail; | |
9601e3f6 CH |
6917 | |
6918 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", | |
6919 | sizeof(struct btrfs_path), 0, | |
6920 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
6921 | if (!btrfs_path_cachep) |
6922 | goto fail; | |
9601e3f6 | 6923 | |
dc89e982 JB |
6924 | btrfs_free_space_cachep = kmem_cache_create("btrfs_free_space_cache", |
6925 | sizeof(struct btrfs_free_space), 0, | |
6926 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
6927 | if (!btrfs_free_space_cachep) | |
6928 | goto fail; | |
6929 | ||
39279cc3 CM |
6930 | return 0; |
6931 | fail: | |
6932 | btrfs_destroy_cachep(); | |
6933 | return -ENOMEM; | |
6934 | } | |
6935 | ||
6936 | static int btrfs_getattr(struct vfsmount *mnt, | |
6937 | struct dentry *dentry, struct kstat *stat) | |
6938 | { | |
6939 | struct inode *inode = dentry->d_inode; | |
fadc0d8b DS |
6940 | u32 blocksize = inode->i_sb->s_blocksize; |
6941 | ||
39279cc3 | 6942 | generic_fillattr(inode, stat); |
0ee5dc67 | 6943 | stat->dev = BTRFS_I(inode)->root->anon_dev; |
d6667462 | 6944 | stat->blksize = PAGE_CACHE_SIZE; |
fadc0d8b DS |
6945 | stat->blocks = (ALIGN(inode_get_bytes(inode), blocksize) + |
6946 | ALIGN(BTRFS_I(inode)->delalloc_bytes, blocksize)) >> 9; | |
39279cc3 CM |
6947 | return 0; |
6948 | } | |
6949 | ||
75e7cb7f LB |
6950 | /* |
6951 | * If a file is moved, it will inherit the cow and compression flags of the new | |
6952 | * directory. | |
6953 | */ | |
6954 | static void fixup_inode_flags(struct inode *dir, struct inode *inode) | |
6955 | { | |
6956 | struct btrfs_inode *b_dir = BTRFS_I(dir); | |
6957 | struct btrfs_inode *b_inode = BTRFS_I(inode); | |
6958 | ||
6959 | if (b_dir->flags & BTRFS_INODE_NODATACOW) | |
6960 | b_inode->flags |= BTRFS_INODE_NODATACOW; | |
6961 | else | |
6962 | b_inode->flags &= ~BTRFS_INODE_NODATACOW; | |
6963 | ||
6964 | if (b_dir->flags & BTRFS_INODE_COMPRESS) | |
6965 | b_inode->flags |= BTRFS_INODE_COMPRESS; | |
6966 | else | |
6967 | b_inode->flags &= ~BTRFS_INODE_COMPRESS; | |
6968 | } | |
6969 | ||
d397712b CM |
6970 | static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
6971 | struct inode *new_dir, struct dentry *new_dentry) | |
39279cc3 CM |
6972 | { |
6973 | struct btrfs_trans_handle *trans; | |
6974 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
4df27c4d | 6975 | struct btrfs_root *dest = BTRFS_I(new_dir)->root; |
39279cc3 CM |
6976 | struct inode *new_inode = new_dentry->d_inode; |
6977 | struct inode *old_inode = old_dentry->d_inode; | |
6978 | struct timespec ctime = CURRENT_TIME; | |
00e4e6b3 | 6979 | u64 index = 0; |
4df27c4d | 6980 | u64 root_objectid; |
39279cc3 | 6981 | int ret; |
33345d01 | 6982 | u64 old_ino = btrfs_ino(old_inode); |
39279cc3 | 6983 | |
33345d01 | 6984 | if (btrfs_ino(new_dir) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
f679a840 YZ |
6985 | return -EPERM; |
6986 | ||
4df27c4d | 6987 | /* we only allow rename subvolume link between subvolumes */ |
33345d01 | 6988 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest) |
3394e160 CM |
6989 | return -EXDEV; |
6990 | ||
33345d01 LZ |
6991 | if (old_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID || |
6992 | (new_inode && btrfs_ino(new_inode) == BTRFS_FIRST_FREE_OBJECTID)) | |
39279cc3 | 6993 | return -ENOTEMPTY; |
5f39d397 | 6994 | |
4df27c4d YZ |
6995 | if (S_ISDIR(old_inode->i_mode) && new_inode && |
6996 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) | |
6997 | return -ENOTEMPTY; | |
5a3f23d5 CM |
6998 | /* |
6999 | * we're using rename to replace one file with another. | |
7000 | * and the replacement file is large. Start IO on it now so | |
7001 | * we don't add too much work to the end of the transaction | |
7002 | */ | |
4baf8c92 | 7003 | if (new_inode && S_ISREG(old_inode->i_mode) && new_inode->i_size && |
5a3f23d5 CM |
7004 | old_inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT) |
7005 | filemap_flush(old_inode->i_mapping); | |
7006 | ||
76dda93c | 7007 | /* close the racy window with snapshot create/destroy ioctl */ |
33345d01 | 7008 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
76dda93c | 7009 | down_read(&root->fs_info->subvol_sem); |
a22285a6 YZ |
7010 | /* |
7011 | * We want to reserve the absolute worst case amount of items. So if | |
7012 | * both inodes are subvols and we need to unlink them then that would | |
7013 | * require 4 item modifications, but if they are both normal inodes it | |
7014 | * would require 5 item modifications, so we'll assume their normal | |
7015 | * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items | |
7016 | * should cover the worst case number of items we'll modify. | |
7017 | */ | |
7018 | trans = btrfs_start_transaction(root, 20); | |
b44c59a8 JL |
7019 | if (IS_ERR(trans)) { |
7020 | ret = PTR_ERR(trans); | |
7021 | goto out_notrans; | |
7022 | } | |
76dda93c | 7023 | |
4df27c4d YZ |
7024 | if (dest != root) |
7025 | btrfs_record_root_in_trans(trans, dest); | |
5f39d397 | 7026 | |
a5719521 YZ |
7027 | ret = btrfs_set_inode_index(new_dir, &index); |
7028 | if (ret) | |
7029 | goto out_fail; | |
5a3f23d5 | 7030 | |
33345d01 | 7031 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
7032 | /* force full log commit if subvolume involved. */ |
7033 | root->fs_info->last_trans_log_full_commit = trans->transid; | |
7034 | } else { | |
a5719521 YZ |
7035 | ret = btrfs_insert_inode_ref(trans, dest, |
7036 | new_dentry->d_name.name, | |
7037 | new_dentry->d_name.len, | |
33345d01 LZ |
7038 | old_ino, |
7039 | btrfs_ino(new_dir), index); | |
a5719521 YZ |
7040 | if (ret) |
7041 | goto out_fail; | |
4df27c4d YZ |
7042 | /* |
7043 | * this is an ugly little race, but the rename is required | |
7044 | * to make sure that if we crash, the inode is either at the | |
7045 | * old name or the new one. pinning the log transaction lets | |
7046 | * us make sure we don't allow a log commit to come in after | |
7047 | * we unlink the name but before we add the new name back in. | |
7048 | */ | |
7049 | btrfs_pin_log_trans(root); | |
7050 | } | |
5a3f23d5 CM |
7051 | /* |
7052 | * make sure the inode gets flushed if it is replacing | |
7053 | * something. | |
7054 | */ | |
33345d01 | 7055 | if (new_inode && new_inode->i_size && S_ISREG(old_inode->i_mode)) |
5a3f23d5 | 7056 | btrfs_add_ordered_operation(trans, root, old_inode); |
5a3f23d5 | 7057 | |
39279cc3 CM |
7058 | old_dir->i_ctime = old_dir->i_mtime = ctime; |
7059 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
7060 | old_inode->i_ctime = ctime; | |
5f39d397 | 7061 | |
12fcfd22 CM |
7062 | if (old_dentry->d_parent != new_dentry->d_parent) |
7063 | btrfs_record_unlink_dir(trans, old_dir, old_inode, 1); | |
7064 | ||
33345d01 | 7065 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
7066 | root_objectid = BTRFS_I(old_inode)->root->root_key.objectid; |
7067 | ret = btrfs_unlink_subvol(trans, root, old_dir, root_objectid, | |
7068 | old_dentry->d_name.name, | |
7069 | old_dentry->d_name.len); | |
7070 | } else { | |
92986796 AV |
7071 | ret = __btrfs_unlink_inode(trans, root, old_dir, |
7072 | old_dentry->d_inode, | |
7073 | old_dentry->d_name.name, | |
7074 | old_dentry->d_name.len); | |
7075 | if (!ret) | |
7076 | ret = btrfs_update_inode(trans, root, old_inode); | |
4df27c4d YZ |
7077 | } |
7078 | BUG_ON(ret); | |
39279cc3 CM |
7079 | |
7080 | if (new_inode) { | |
7081 | new_inode->i_ctime = CURRENT_TIME; | |
33345d01 | 7082 | if (unlikely(btrfs_ino(new_inode) == |
4df27c4d YZ |
7083 | BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
7084 | root_objectid = BTRFS_I(new_inode)->location.objectid; | |
7085 | ret = btrfs_unlink_subvol(trans, dest, new_dir, | |
7086 | root_objectid, | |
7087 | new_dentry->d_name.name, | |
7088 | new_dentry->d_name.len); | |
7089 | BUG_ON(new_inode->i_nlink == 0); | |
7090 | } else { | |
7091 | ret = btrfs_unlink_inode(trans, dest, new_dir, | |
7092 | new_dentry->d_inode, | |
7093 | new_dentry->d_name.name, | |
7094 | new_dentry->d_name.len); | |
7095 | } | |
7096 | BUG_ON(ret); | |
7b128766 | 7097 | if (new_inode->i_nlink == 0) { |
e02119d5 | 7098 | ret = btrfs_orphan_add(trans, new_dentry->d_inode); |
4df27c4d | 7099 | BUG_ON(ret); |
7b128766 | 7100 | } |
39279cc3 | 7101 | } |
aec7477b | 7102 | |
75e7cb7f LB |
7103 | fixup_inode_flags(new_dir, old_inode); |
7104 | ||
4df27c4d YZ |
7105 | ret = btrfs_add_link(trans, new_dir, old_inode, |
7106 | new_dentry->d_name.name, | |
a5719521 | 7107 | new_dentry->d_name.len, 0, index); |
4df27c4d | 7108 | BUG_ON(ret); |
39279cc3 | 7109 | |
33345d01 | 7110 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID) { |
10d9f309 | 7111 | struct dentry *parent = new_dentry->d_parent; |
6a912213 | 7112 | btrfs_log_new_name(trans, old_inode, old_dir, parent); |
4df27c4d YZ |
7113 | btrfs_end_log_trans(root); |
7114 | } | |
39279cc3 | 7115 | out_fail: |
7ad85bb7 | 7116 | btrfs_end_transaction(trans, root); |
b44c59a8 | 7117 | out_notrans: |
33345d01 | 7118 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
76dda93c | 7119 | up_read(&root->fs_info->subvol_sem); |
9ed74f2d | 7120 | |
39279cc3 CM |
7121 | return ret; |
7122 | } | |
7123 | ||
d352ac68 CM |
7124 | /* |
7125 | * some fairly slow code that needs optimization. This walks the list | |
7126 | * of all the inodes with pending delalloc and forces them to disk. | |
7127 | */ | |
24bbcf04 | 7128 | int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput) |
ea8c2819 CM |
7129 | { |
7130 | struct list_head *head = &root->fs_info->delalloc_inodes; | |
7131 | struct btrfs_inode *binode; | |
5b21f2ed | 7132 | struct inode *inode; |
ea8c2819 | 7133 | |
c146afad YZ |
7134 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
7135 | return -EROFS; | |
7136 | ||
75eff68e | 7137 | spin_lock(&root->fs_info->delalloc_lock); |
d397712b | 7138 | while (!list_empty(head)) { |
ea8c2819 CM |
7139 | binode = list_entry(head->next, struct btrfs_inode, |
7140 | delalloc_inodes); | |
5b21f2ed ZY |
7141 | inode = igrab(&binode->vfs_inode); |
7142 | if (!inode) | |
7143 | list_del_init(&binode->delalloc_inodes); | |
75eff68e | 7144 | spin_unlock(&root->fs_info->delalloc_lock); |
5b21f2ed | 7145 | if (inode) { |
8c8bee1d | 7146 | filemap_flush(inode->i_mapping); |
24bbcf04 YZ |
7147 | if (delay_iput) |
7148 | btrfs_add_delayed_iput(inode); | |
7149 | else | |
7150 | iput(inode); | |
5b21f2ed ZY |
7151 | } |
7152 | cond_resched(); | |
75eff68e | 7153 | spin_lock(&root->fs_info->delalloc_lock); |
ea8c2819 | 7154 | } |
75eff68e | 7155 | spin_unlock(&root->fs_info->delalloc_lock); |
8c8bee1d CM |
7156 | |
7157 | /* the filemap_flush will queue IO into the worker threads, but | |
7158 | * we have to make sure the IO is actually started and that | |
7159 | * ordered extents get created before we return | |
7160 | */ | |
7161 | atomic_inc(&root->fs_info->async_submit_draining); | |
d397712b | 7162 | while (atomic_read(&root->fs_info->nr_async_submits) || |
771ed689 | 7163 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
8c8bee1d | 7164 | wait_event(root->fs_info->async_submit_wait, |
771ed689 CM |
7165 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
7166 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
8c8bee1d CM |
7167 | } |
7168 | atomic_dec(&root->fs_info->async_submit_draining); | |
ea8c2819 CM |
7169 | return 0; |
7170 | } | |
7171 | ||
39279cc3 CM |
7172 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
7173 | const char *symname) | |
7174 | { | |
7175 | struct btrfs_trans_handle *trans; | |
7176 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
7177 | struct btrfs_path *path; | |
7178 | struct btrfs_key key; | |
1832a6d5 | 7179 | struct inode *inode = NULL; |
39279cc3 CM |
7180 | int err; |
7181 | int drop_inode = 0; | |
7182 | u64 objectid; | |
00e4e6b3 | 7183 | u64 index = 0 ; |
39279cc3 CM |
7184 | int name_len; |
7185 | int datasize; | |
5f39d397 | 7186 | unsigned long ptr; |
39279cc3 | 7187 | struct btrfs_file_extent_item *ei; |
5f39d397 | 7188 | struct extent_buffer *leaf; |
1832a6d5 | 7189 | unsigned long nr = 0; |
39279cc3 CM |
7190 | |
7191 | name_len = strlen(symname) + 1; | |
7192 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
7193 | return -ENAMETOOLONG; | |
1832a6d5 | 7194 | |
9ed74f2d JB |
7195 | /* |
7196 | * 2 items for inode item and ref | |
7197 | * 2 items for dir items | |
7198 | * 1 item for xattr if selinux is on | |
7199 | */ | |
a22285a6 YZ |
7200 | trans = btrfs_start_transaction(root, 5); |
7201 | if (IS_ERR(trans)) | |
7202 | return PTR_ERR(trans); | |
1832a6d5 | 7203 | |
581bb050 LZ |
7204 | err = btrfs_find_free_ino(root, &objectid); |
7205 | if (err) | |
7206 | goto out_unlock; | |
7207 | ||
aec7477b | 7208 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 7209 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 7210 | S_IFLNK|S_IRWXUGO, &index); |
7cf96da3 TI |
7211 | if (IS_ERR(inode)) { |
7212 | err = PTR_ERR(inode); | |
39279cc3 | 7213 | goto out_unlock; |
7cf96da3 | 7214 | } |
39279cc3 | 7215 | |
2a7dba39 | 7216 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
33268eaf JB |
7217 | if (err) { |
7218 | drop_inode = 1; | |
7219 | goto out_unlock; | |
7220 | } | |
7221 | ||
ad19db71 CS |
7222 | /* |
7223 | * If the active LSM wants to access the inode during | |
7224 | * d_instantiate it needs these. Smack checks to see | |
7225 | * if the filesystem supports xattrs by looking at the | |
7226 | * ops vector. | |
7227 | */ | |
7228 | inode->i_fop = &btrfs_file_operations; | |
7229 | inode->i_op = &btrfs_file_inode_operations; | |
7230 | ||
a1b075d2 | 7231 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
39279cc3 CM |
7232 | if (err) |
7233 | drop_inode = 1; | |
7234 | else { | |
7235 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 7236 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 7237 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 | 7238 | } |
39279cc3 CM |
7239 | if (drop_inode) |
7240 | goto out_unlock; | |
7241 | ||
7242 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
7243 | if (!path) { |
7244 | err = -ENOMEM; | |
7245 | drop_inode = 1; | |
7246 | goto out_unlock; | |
7247 | } | |
33345d01 | 7248 | key.objectid = btrfs_ino(inode); |
39279cc3 | 7249 | key.offset = 0; |
39279cc3 CM |
7250 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
7251 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
7252 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
7253 | datasize); | |
54aa1f4d CM |
7254 | if (err) { |
7255 | drop_inode = 1; | |
b0839166 | 7256 | btrfs_free_path(path); |
54aa1f4d CM |
7257 | goto out_unlock; |
7258 | } | |
5f39d397 CM |
7259 | leaf = path->nodes[0]; |
7260 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
7261 | struct btrfs_file_extent_item); | |
7262 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
7263 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 | 7264 | BTRFS_FILE_EXTENT_INLINE); |
c8b97818 CM |
7265 | btrfs_set_file_extent_encryption(leaf, ei, 0); |
7266 | btrfs_set_file_extent_compression(leaf, ei, 0); | |
7267 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); | |
7268 | btrfs_set_file_extent_ram_bytes(leaf, ei, name_len); | |
7269 | ||
39279cc3 | 7270 | ptr = btrfs_file_extent_inline_start(ei); |
5f39d397 CM |
7271 | write_extent_buffer(leaf, symname, ptr, name_len); |
7272 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 7273 | btrfs_free_path(path); |
5f39d397 | 7274 | |
39279cc3 CM |
7275 | inode->i_op = &btrfs_symlink_inode_operations; |
7276 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 7277 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d899e052 | 7278 | inode_set_bytes(inode, name_len); |
dbe674a9 | 7279 | btrfs_i_size_write(inode, name_len - 1); |
54aa1f4d CM |
7280 | err = btrfs_update_inode(trans, root, inode); |
7281 | if (err) | |
7282 | drop_inode = 1; | |
39279cc3 CM |
7283 | |
7284 | out_unlock: | |
08c422c2 AV |
7285 | if (!err) |
7286 | d_instantiate(dentry, inode); | |
d3c2fdcf | 7287 | nr = trans->blocks_used; |
7ad85bb7 | 7288 | btrfs_end_transaction(trans, root); |
39279cc3 CM |
7289 | if (drop_inode) { |
7290 | inode_dec_link_count(inode); | |
7291 | iput(inode); | |
7292 | } | |
d3c2fdcf | 7293 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
7294 | return err; |
7295 | } | |
16432985 | 7296 | |
0af3d00b JB |
7297 | static int __btrfs_prealloc_file_range(struct inode *inode, int mode, |
7298 | u64 start, u64 num_bytes, u64 min_size, | |
7299 | loff_t actual_len, u64 *alloc_hint, | |
7300 | struct btrfs_trans_handle *trans) | |
d899e052 | 7301 | { |
d899e052 YZ |
7302 | struct btrfs_root *root = BTRFS_I(inode)->root; |
7303 | struct btrfs_key ins; | |
d899e052 | 7304 | u64 cur_offset = start; |
55a61d1d | 7305 | u64 i_size; |
d899e052 | 7306 | int ret = 0; |
0af3d00b | 7307 | bool own_trans = true; |
d899e052 | 7308 | |
0af3d00b JB |
7309 | if (trans) |
7310 | own_trans = false; | |
d899e052 | 7311 | while (num_bytes > 0) { |
0af3d00b JB |
7312 | if (own_trans) { |
7313 | trans = btrfs_start_transaction(root, 3); | |
7314 | if (IS_ERR(trans)) { | |
7315 | ret = PTR_ERR(trans); | |
7316 | break; | |
7317 | } | |
5a303d5d YZ |
7318 | } |
7319 | ||
efa56464 YZ |
7320 | ret = btrfs_reserve_extent(trans, root, num_bytes, min_size, |
7321 | 0, *alloc_hint, (u64)-1, &ins, 1); | |
5a303d5d | 7322 | if (ret) { |
0af3d00b JB |
7323 | if (own_trans) |
7324 | btrfs_end_transaction(trans, root); | |
a22285a6 | 7325 | break; |
d899e052 | 7326 | } |
5a303d5d | 7327 | |
d899e052 YZ |
7328 | ret = insert_reserved_file_extent(trans, inode, |
7329 | cur_offset, ins.objectid, | |
7330 | ins.offset, ins.offset, | |
920bbbfb | 7331 | ins.offset, 0, 0, 0, |
d899e052 YZ |
7332 | BTRFS_FILE_EXTENT_PREALLOC); |
7333 | BUG_ON(ret); | |
a1ed835e CM |
7334 | btrfs_drop_extent_cache(inode, cur_offset, |
7335 | cur_offset + ins.offset -1, 0); | |
5a303d5d | 7336 | |
d899e052 YZ |
7337 | num_bytes -= ins.offset; |
7338 | cur_offset += ins.offset; | |
efa56464 | 7339 | *alloc_hint = ins.objectid + ins.offset; |
5a303d5d | 7340 | |
d899e052 | 7341 | inode->i_ctime = CURRENT_TIME; |
6cbff00f | 7342 | BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC; |
d899e052 | 7343 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
efa56464 YZ |
7344 | (actual_len > inode->i_size) && |
7345 | (cur_offset > inode->i_size)) { | |
d1ea6a61 | 7346 | if (cur_offset > actual_len) |
55a61d1d | 7347 | i_size = actual_len; |
d1ea6a61 | 7348 | else |
55a61d1d JB |
7349 | i_size = cur_offset; |
7350 | i_size_write(inode, i_size); | |
7351 | btrfs_ordered_update_i_size(inode, i_size, NULL); | |
5a303d5d YZ |
7352 | } |
7353 | ||
d899e052 YZ |
7354 | ret = btrfs_update_inode(trans, root, inode); |
7355 | BUG_ON(ret); | |
d899e052 | 7356 | |
0af3d00b JB |
7357 | if (own_trans) |
7358 | btrfs_end_transaction(trans, root); | |
5a303d5d | 7359 | } |
d899e052 YZ |
7360 | return ret; |
7361 | } | |
7362 | ||
0af3d00b JB |
7363 | int btrfs_prealloc_file_range(struct inode *inode, int mode, |
7364 | u64 start, u64 num_bytes, u64 min_size, | |
7365 | loff_t actual_len, u64 *alloc_hint) | |
7366 | { | |
7367 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
7368 | min_size, actual_len, alloc_hint, | |
7369 | NULL); | |
7370 | } | |
7371 | ||
7372 | int btrfs_prealloc_file_range_trans(struct inode *inode, | |
7373 | struct btrfs_trans_handle *trans, int mode, | |
7374 | u64 start, u64 num_bytes, u64 min_size, | |
7375 | loff_t actual_len, u64 *alloc_hint) | |
7376 | { | |
7377 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
7378 | min_size, actual_len, alloc_hint, trans); | |
7379 | } | |
7380 | ||
e6dcd2dc CM |
7381 | static int btrfs_set_page_dirty(struct page *page) |
7382 | { | |
e6dcd2dc CM |
7383 | return __set_page_dirty_nobuffers(page); |
7384 | } | |
7385 | ||
10556cb2 | 7386 | static int btrfs_permission(struct inode *inode, int mask) |
fdebe2bd | 7387 | { |
b83cc969 | 7388 | struct btrfs_root *root = BTRFS_I(inode)->root; |
cb6db4e5 | 7389 | umode_t mode = inode->i_mode; |
b83cc969 | 7390 | |
cb6db4e5 JM |
7391 | if (mask & MAY_WRITE && |
7392 | (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) { | |
7393 | if (btrfs_root_readonly(root)) | |
7394 | return -EROFS; | |
7395 | if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) | |
7396 | return -EACCES; | |
7397 | } | |
2830ba7f | 7398 | return generic_permission(inode, mask); |
fdebe2bd | 7399 | } |
39279cc3 | 7400 | |
6e1d5dcc | 7401 | static const struct inode_operations btrfs_dir_inode_operations = { |
3394e160 | 7402 | .getattr = btrfs_getattr, |
39279cc3 CM |
7403 | .lookup = btrfs_lookup, |
7404 | .create = btrfs_create, | |
7405 | .unlink = btrfs_unlink, | |
7406 | .link = btrfs_link, | |
7407 | .mkdir = btrfs_mkdir, | |
7408 | .rmdir = btrfs_rmdir, | |
7409 | .rename = btrfs_rename, | |
7410 | .symlink = btrfs_symlink, | |
7411 | .setattr = btrfs_setattr, | |
618e21d5 | 7412 | .mknod = btrfs_mknod, |
95819c05 CH |
7413 | .setxattr = btrfs_setxattr, |
7414 | .getxattr = btrfs_getxattr, | |
5103e947 | 7415 | .listxattr = btrfs_listxattr, |
95819c05 | 7416 | .removexattr = btrfs_removexattr, |
fdebe2bd | 7417 | .permission = btrfs_permission, |
4e34e719 | 7418 | .get_acl = btrfs_get_acl, |
39279cc3 | 7419 | }; |
6e1d5dcc | 7420 | static const struct inode_operations btrfs_dir_ro_inode_operations = { |
39279cc3 | 7421 | .lookup = btrfs_lookup, |
fdebe2bd | 7422 | .permission = btrfs_permission, |
4e34e719 | 7423 | .get_acl = btrfs_get_acl, |
39279cc3 | 7424 | }; |
76dda93c | 7425 | |
828c0950 | 7426 | static const struct file_operations btrfs_dir_file_operations = { |
39279cc3 CM |
7427 | .llseek = generic_file_llseek, |
7428 | .read = generic_read_dir, | |
cbdf5a24 | 7429 | .readdir = btrfs_real_readdir, |
34287aa3 | 7430 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 7431 | #ifdef CONFIG_COMPAT |
34287aa3 | 7432 | .compat_ioctl = btrfs_ioctl, |
39279cc3 | 7433 | #endif |
6bf13c0c | 7434 | .release = btrfs_release_file, |
e02119d5 | 7435 | .fsync = btrfs_sync_file, |
39279cc3 CM |
7436 | }; |
7437 | ||
d1310b2e | 7438 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 7439 | .fill_delalloc = run_delalloc_range, |
065631f6 | 7440 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 7441 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac | 7442 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, |
e6dcd2dc | 7443 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
247e743c | 7444 | .writepage_start_hook = btrfs_writepage_start_hook, |
b0c68f8b CM |
7445 | .set_bit_hook = btrfs_set_bit_hook, |
7446 | .clear_bit_hook = btrfs_clear_bit_hook, | |
9ed74f2d JB |
7447 | .merge_extent_hook = btrfs_merge_extent_hook, |
7448 | .split_extent_hook = btrfs_split_extent_hook, | |
07157aac CM |
7449 | }; |
7450 | ||
35054394 CM |
7451 | /* |
7452 | * btrfs doesn't support the bmap operation because swapfiles | |
7453 | * use bmap to make a mapping of extents in the file. They assume | |
7454 | * these extents won't change over the life of the file and they | |
7455 | * use the bmap result to do IO directly to the drive. | |
7456 | * | |
7457 | * the btrfs bmap call would return logical addresses that aren't | |
7458 | * suitable for IO and they also will change frequently as COW | |
7459 | * operations happen. So, swapfile + btrfs == corruption. | |
7460 | * | |
7461 | * For now we're avoiding this by dropping bmap. | |
7462 | */ | |
7f09410b | 7463 | static const struct address_space_operations btrfs_aops = { |
39279cc3 CM |
7464 | .readpage = btrfs_readpage, |
7465 | .writepage = btrfs_writepage, | |
b293f02e | 7466 | .writepages = btrfs_writepages, |
3ab2fb5a | 7467 | .readpages = btrfs_readpages, |
16432985 | 7468 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
7469 | .invalidatepage = btrfs_invalidatepage, |
7470 | .releasepage = btrfs_releasepage, | |
e6dcd2dc | 7471 | .set_page_dirty = btrfs_set_page_dirty, |
465fdd97 | 7472 | .error_remove_page = generic_error_remove_page, |
39279cc3 CM |
7473 | }; |
7474 | ||
7f09410b | 7475 | static const struct address_space_operations btrfs_symlink_aops = { |
39279cc3 CM |
7476 | .readpage = btrfs_readpage, |
7477 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
7478 | .invalidatepage = btrfs_invalidatepage, |
7479 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
7480 | }; |
7481 | ||
6e1d5dcc | 7482 | static const struct inode_operations btrfs_file_inode_operations = { |
39279cc3 CM |
7483 | .getattr = btrfs_getattr, |
7484 | .setattr = btrfs_setattr, | |
95819c05 CH |
7485 | .setxattr = btrfs_setxattr, |
7486 | .getxattr = btrfs_getxattr, | |
5103e947 | 7487 | .listxattr = btrfs_listxattr, |
95819c05 | 7488 | .removexattr = btrfs_removexattr, |
fdebe2bd | 7489 | .permission = btrfs_permission, |
1506fcc8 | 7490 | .fiemap = btrfs_fiemap, |
4e34e719 | 7491 | .get_acl = btrfs_get_acl, |
39279cc3 | 7492 | }; |
6e1d5dcc | 7493 | static const struct inode_operations btrfs_special_inode_operations = { |
618e21d5 JB |
7494 | .getattr = btrfs_getattr, |
7495 | .setattr = btrfs_setattr, | |
fdebe2bd | 7496 | .permission = btrfs_permission, |
95819c05 CH |
7497 | .setxattr = btrfs_setxattr, |
7498 | .getxattr = btrfs_getxattr, | |
33268eaf | 7499 | .listxattr = btrfs_listxattr, |
95819c05 | 7500 | .removexattr = btrfs_removexattr, |
4e34e719 | 7501 | .get_acl = btrfs_get_acl, |
618e21d5 | 7502 | }; |
6e1d5dcc | 7503 | static const struct inode_operations btrfs_symlink_inode_operations = { |
39279cc3 CM |
7504 | .readlink = generic_readlink, |
7505 | .follow_link = page_follow_link_light, | |
7506 | .put_link = page_put_link, | |
f209561a | 7507 | .getattr = btrfs_getattr, |
22c44fe6 | 7508 | .setattr = btrfs_setattr, |
fdebe2bd | 7509 | .permission = btrfs_permission, |
0279b4cd JO |
7510 | .setxattr = btrfs_setxattr, |
7511 | .getxattr = btrfs_getxattr, | |
7512 | .listxattr = btrfs_listxattr, | |
7513 | .removexattr = btrfs_removexattr, | |
4e34e719 | 7514 | .get_acl = btrfs_get_acl, |
39279cc3 | 7515 | }; |
76dda93c | 7516 | |
82d339d9 | 7517 | const struct dentry_operations btrfs_dentry_operations = { |
76dda93c | 7518 | .d_delete = btrfs_dentry_delete, |
b4aff1f8 | 7519 | .d_release = btrfs_dentry_release, |
76dda93c | 7520 | }; |