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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 | ||
a74a4b97 | 19 | #include <linux/version.h> |
e20d96d6 | 20 | #include <linux/fs.h> |
d98237b3 | 21 | #include <linux/blkdev.h> |
87cbda5c | 22 | #include <linux/scatterlist.h> |
22b0ebda | 23 | #include <linux/swap.h> |
0f7d52f4 | 24 | #include <linux/radix-tree.h> |
35b7e476 | 25 | #include <linux/writeback.h> |
5f39d397 | 26 | #include <linux/buffer_head.h> // for block_sync_page |
ce9adaa5 | 27 | #include <linux/workqueue.h> |
a74a4b97 CM |
28 | #include <linux/kthread.h> |
29 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20) | |
30 | # include <linux/freezer.h> | |
31 | #else | |
32 | # include <linux/sched.h> | |
33 | #endif | |
a5eb62e3 | 34 | #include "crc32c.h" |
eb60ceac CM |
35 | #include "ctree.h" |
36 | #include "disk-io.h" | |
e089f05c | 37 | #include "transaction.h" |
0f7d52f4 | 38 | #include "btrfs_inode.h" |
0b86a832 | 39 | #include "volumes.h" |
db94535d | 40 | #include "print-tree.h" |
8b712842 | 41 | #include "async-thread.h" |
925baedd | 42 | #include "locking.h" |
eb60ceac | 43 | |
5f39d397 CM |
44 | #if 0 |
45 | static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf) | |
7eccb903 | 46 | { |
5f39d397 CM |
47 | if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) { |
48 | printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n", | |
49 | (unsigned long long)extent_buffer_blocknr(buf), | |
50 | (unsigned long long)btrfs_header_blocknr(buf)); | |
39279cc3 | 51 | return 1; |
d98237b3 | 52 | } |
9a8dd150 | 53 | return 0; |
eb60ceac | 54 | } |
5f39d397 | 55 | #endif |
eb60ceac | 56 | |
d1310b2e | 57 | static struct extent_io_ops btree_extent_io_ops; |
8b712842 | 58 | static void end_workqueue_fn(struct btrfs_work *work); |
ce9adaa5 CM |
59 | |
60 | struct end_io_wq { | |
61 | struct bio *bio; | |
62 | bio_end_io_t *end_io; | |
63 | void *private; | |
64 | struct btrfs_fs_info *info; | |
65 | int error; | |
22c59948 | 66 | int metadata; |
ce9adaa5 | 67 | struct list_head list; |
8b712842 | 68 | struct btrfs_work work; |
ce9adaa5 | 69 | }; |
0da5468f | 70 | |
44b8bd7e CM |
71 | struct async_submit_bio { |
72 | struct inode *inode; | |
73 | struct bio *bio; | |
74 | struct list_head list; | |
75 | extent_submit_bio_hook_t *submit_bio_hook; | |
76 | int rw; | |
77 | int mirror_num; | |
8b712842 | 78 | struct btrfs_work work; |
44b8bd7e CM |
79 | }; |
80 | ||
5f39d397 | 81 | struct extent_map *btree_get_extent(struct inode *inode, struct page *page, |
d1310b2e | 82 | size_t page_offset, u64 start, u64 len, |
5f39d397 | 83 | int create) |
7eccb903 | 84 | { |
5f39d397 CM |
85 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
86 | struct extent_map *em; | |
87 | int ret; | |
88 | ||
d1310b2e CM |
89 | spin_lock(&em_tree->lock); |
90 | em = lookup_extent_mapping(em_tree, start, len); | |
a061fc8d CM |
91 | if (em) { |
92 | em->bdev = | |
93 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
94 | spin_unlock(&em_tree->lock); | |
5f39d397 | 95 | goto out; |
a061fc8d CM |
96 | } |
97 | spin_unlock(&em_tree->lock); | |
7b13b7b1 | 98 | |
5f39d397 CM |
99 | em = alloc_extent_map(GFP_NOFS); |
100 | if (!em) { | |
101 | em = ERR_PTR(-ENOMEM); | |
102 | goto out; | |
103 | } | |
104 | em->start = 0; | |
0afbaf8c | 105 | em->len = (u64)-1; |
5f39d397 | 106 | em->block_start = 0; |
a061fc8d | 107 | em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
d1310b2e CM |
108 | |
109 | spin_lock(&em_tree->lock); | |
5f39d397 CM |
110 | ret = add_extent_mapping(em_tree, em); |
111 | if (ret == -EEXIST) { | |
0afbaf8c CM |
112 | u64 failed_start = em->start; |
113 | u64 failed_len = em->len; | |
114 | ||
115 | printk("failed to insert %Lu %Lu -> %Lu into tree\n", | |
116 | em->start, em->len, em->block_start); | |
5f39d397 | 117 | free_extent_map(em); |
7b13b7b1 | 118 | em = lookup_extent_mapping(em_tree, start, len); |
0afbaf8c CM |
119 | if (em) { |
120 | printk("after failing, found %Lu %Lu %Lu\n", | |
121 | em->start, em->len, em->block_start); | |
7b13b7b1 | 122 | ret = 0; |
0afbaf8c CM |
123 | } else { |
124 | em = lookup_extent_mapping(em_tree, failed_start, | |
125 | failed_len); | |
126 | if (em) { | |
127 | printk("double failure lookup gives us " | |
128 | "%Lu %Lu -> %Lu\n", em->start, | |
129 | em->len, em->block_start); | |
130 | free_extent_map(em); | |
131 | } | |
7b13b7b1 | 132 | ret = -EIO; |
0afbaf8c | 133 | } |
5f39d397 | 134 | } else if (ret) { |
7b13b7b1 CM |
135 | free_extent_map(em); |
136 | em = NULL; | |
5f39d397 | 137 | } |
7b13b7b1 CM |
138 | spin_unlock(&em_tree->lock); |
139 | ||
140 | if (ret) | |
141 | em = ERR_PTR(ret); | |
5f39d397 CM |
142 | out: |
143 | return em; | |
7eccb903 CM |
144 | } |
145 | ||
19c00ddc CM |
146 | u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len) |
147 | { | |
a5eb62e3 | 148 | return btrfs_crc32c(seed, data, len); |
19c00ddc CM |
149 | } |
150 | ||
151 | void btrfs_csum_final(u32 crc, char *result) | |
152 | { | |
153 | *(__le32 *)result = ~cpu_to_le32(crc); | |
154 | } | |
155 | ||
156 | static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, | |
157 | int verify) | |
158 | { | |
159 | char result[BTRFS_CRC32_SIZE]; | |
160 | unsigned long len; | |
161 | unsigned long cur_len; | |
162 | unsigned long offset = BTRFS_CSUM_SIZE; | |
163 | char *map_token = NULL; | |
164 | char *kaddr; | |
165 | unsigned long map_start; | |
166 | unsigned long map_len; | |
167 | int err; | |
168 | u32 crc = ~(u32)0; | |
169 | ||
170 | len = buf->len - offset; | |
171 | while(len > 0) { | |
172 | err = map_private_extent_buffer(buf, offset, 32, | |
173 | &map_token, &kaddr, | |
174 | &map_start, &map_len, KM_USER0); | |
175 | if (err) { | |
176 | printk("failed to map extent buffer! %lu\n", | |
177 | offset); | |
178 | return 1; | |
179 | } | |
180 | cur_len = min(len, map_len - (offset - map_start)); | |
181 | crc = btrfs_csum_data(root, kaddr + offset - map_start, | |
182 | crc, cur_len); | |
183 | len -= cur_len; | |
184 | offset += cur_len; | |
185 | unmap_extent_buffer(buf, map_token, KM_USER0); | |
186 | } | |
187 | btrfs_csum_final(crc, result); | |
188 | ||
189 | if (verify) { | |
e4204ded CM |
190 | int from_this_trans = 0; |
191 | ||
192 | if (root->fs_info->running_transaction && | |
193 | btrfs_header_generation(buf) == | |
194 | root->fs_info->running_transaction->transid) | |
195 | from_this_trans = 1; | |
196 | ||
197 | /* FIXME, this is not good */ | |
63b10fc4 | 198 | if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) { |
e4204ded CM |
199 | u32 val; |
200 | u32 found = 0; | |
201 | memcpy(&found, result, BTRFS_CRC32_SIZE); | |
202 | ||
203 | read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE); | |
204 | printk("btrfs: %s checksum verify failed on %llu " | |
63b10fc4 CM |
205 | "wanted %X found %X from_this_trans %d " |
206 | "level %d\n", | |
19c00ddc | 207 | root->fs_info->sb->s_id, |
63b10fc4 CM |
208 | buf->start, val, found, from_this_trans, |
209 | btrfs_header_level(buf)); | |
19c00ddc CM |
210 | return 1; |
211 | } | |
212 | } else { | |
213 | write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE); | |
214 | } | |
215 | return 0; | |
216 | } | |
217 | ||
1259ab75 CM |
218 | static int verify_parent_transid(struct extent_io_tree *io_tree, |
219 | struct extent_buffer *eb, u64 parent_transid) | |
220 | { | |
221 | int ret; | |
222 | ||
223 | if (!parent_transid || btrfs_header_generation(eb) == parent_transid) | |
224 | return 0; | |
225 | ||
226 | lock_extent(io_tree, eb->start, eb->start + eb->len - 1, GFP_NOFS); | |
227 | if (extent_buffer_uptodate(io_tree, eb) && | |
228 | btrfs_header_generation(eb) == parent_transid) { | |
229 | ret = 0; | |
230 | goto out; | |
231 | } | |
232 | printk("parent transid verify failed on %llu wanted %llu found %llu\n", | |
233 | (unsigned long long)eb->start, | |
234 | (unsigned long long)parent_transid, | |
235 | (unsigned long long)btrfs_header_generation(eb)); | |
236 | ret = 1; | |
237 | out: | |
238 | clear_extent_buffer_uptodate(io_tree, eb); | |
239 | unlock_extent(io_tree, eb->start, eb->start + eb->len - 1, | |
240 | GFP_NOFS); | |
241 | return ret; | |
242 | ||
243 | } | |
244 | ||
f188591e CM |
245 | static int btree_read_extent_buffer_pages(struct btrfs_root *root, |
246 | struct extent_buffer *eb, | |
ca7a79ad | 247 | u64 start, u64 parent_transid) |
f188591e CM |
248 | { |
249 | struct extent_io_tree *io_tree; | |
250 | int ret; | |
251 | int num_copies = 0; | |
252 | int mirror_num = 0; | |
253 | ||
254 | io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; | |
255 | while (1) { | |
256 | ret = read_extent_buffer_pages(io_tree, eb, start, 1, | |
257 | btree_get_extent, mirror_num); | |
1259ab75 CM |
258 | if (!ret && |
259 | !verify_parent_transid(io_tree, eb, parent_transid)) | |
f188591e | 260 | return ret; |
4235298e | 261 | |
f188591e CM |
262 | num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, |
263 | eb->start, eb->len); | |
4235298e | 264 | if (num_copies == 1) |
f188591e | 265 | return ret; |
4235298e | 266 | |
f188591e | 267 | mirror_num++; |
4235298e | 268 | if (mirror_num > num_copies) |
f188591e | 269 | return ret; |
f188591e | 270 | } |
f188591e CM |
271 | return -EIO; |
272 | } | |
19c00ddc CM |
273 | |
274 | int csum_dirty_buffer(struct btrfs_root *root, struct page *page) | |
275 | { | |
d1310b2e | 276 | struct extent_io_tree *tree; |
35ebb934 | 277 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
19c00ddc CM |
278 | u64 found_start; |
279 | int found_level; | |
280 | unsigned long len; | |
281 | struct extent_buffer *eb; | |
f188591e CM |
282 | int ret; |
283 | ||
d1310b2e | 284 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
19c00ddc CM |
285 | |
286 | if (page->private == EXTENT_PAGE_PRIVATE) | |
287 | goto out; | |
288 | if (!page->private) | |
289 | goto out; | |
290 | len = page->private >> 2; | |
291 | if (len == 0) { | |
292 | WARN_ON(1); | |
293 | } | |
294 | eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); | |
ca7a79ad CM |
295 | ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, |
296 | btrfs_header_generation(eb)); | |
f188591e | 297 | BUG_ON(ret); |
19c00ddc CM |
298 | found_start = btrfs_header_bytenr(eb); |
299 | if (found_start != start) { | |
300 | printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n", | |
301 | start, found_start, len); | |
55c69072 CM |
302 | WARN_ON(1); |
303 | goto err; | |
304 | } | |
305 | if (eb->first_page != page) { | |
306 | printk("bad first page %lu %lu\n", eb->first_page->index, | |
307 | page->index); | |
308 | WARN_ON(1); | |
309 | goto err; | |
310 | } | |
311 | if (!PageUptodate(page)) { | |
312 | printk("csum not up to date page %lu\n", page->index); | |
313 | WARN_ON(1); | |
314 | goto err; | |
19c00ddc CM |
315 | } |
316 | found_level = btrfs_header_level(eb); | |
63b10fc4 CM |
317 | spin_lock(&root->fs_info->hash_lock); |
318 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); | |
319 | spin_unlock(&root->fs_info->hash_lock); | |
19c00ddc | 320 | csum_tree_block(root, eb, 0); |
55c69072 | 321 | err: |
19c00ddc CM |
322 | free_extent_buffer(eb); |
323 | out: | |
324 | return 0; | |
325 | } | |
326 | ||
0da5468f | 327 | static int btree_writepage_io_hook(struct page *page, u64 start, u64 end) |
d98237b3 | 328 | { |
19c00ddc | 329 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; |
19c00ddc CM |
330 | |
331 | csum_dirty_buffer(root, page); | |
0da5468f CM |
332 | return 0; |
333 | } | |
334 | ||
ce9adaa5 CM |
335 | int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
336 | struct extent_state *state) | |
337 | { | |
338 | struct extent_io_tree *tree; | |
339 | u64 found_start; | |
340 | int found_level; | |
341 | unsigned long len; | |
342 | struct extent_buffer *eb; | |
343 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
f188591e | 344 | int ret = 0; |
ce9adaa5 CM |
345 | |
346 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
347 | if (page->private == EXTENT_PAGE_PRIVATE) | |
348 | goto out; | |
349 | if (!page->private) | |
350 | goto out; | |
351 | len = page->private >> 2; | |
352 | if (len == 0) { | |
353 | WARN_ON(1); | |
354 | } | |
355 | eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); | |
f188591e | 356 | |
ce9adaa5 CM |
357 | found_start = btrfs_header_bytenr(eb); |
358 | if (found_start != start) { | |
f188591e | 359 | ret = -EIO; |
ce9adaa5 CM |
360 | goto err; |
361 | } | |
362 | if (eb->first_page != page) { | |
363 | printk("bad first page %lu %lu\n", eb->first_page->index, | |
364 | page->index); | |
365 | WARN_ON(1); | |
f188591e | 366 | ret = -EIO; |
ce9adaa5 CM |
367 | goto err; |
368 | } | |
1259ab75 CM |
369 | if (memcmp_extent_buffer(eb, root->fs_info->fsid, |
370 | (unsigned long)btrfs_header_fsid(eb), | |
371 | BTRFS_FSID_SIZE)) { | |
372 | printk("bad fsid on block %Lu\n", eb->start); | |
373 | ret = -EIO; | |
374 | goto err; | |
375 | } | |
ce9adaa5 CM |
376 | found_level = btrfs_header_level(eb); |
377 | ||
378 | ret = csum_tree_block(root, eb, 1); | |
f188591e CM |
379 | if (ret) |
380 | ret = -EIO; | |
ce9adaa5 CM |
381 | |
382 | end = min_t(u64, eb->len, PAGE_CACHE_SIZE); | |
383 | end = eb->start + end - 1; | |
ce9adaa5 CM |
384 | err: |
385 | free_extent_buffer(eb); | |
386 | out: | |
f188591e | 387 | return ret; |
ce9adaa5 CM |
388 | } |
389 | ||
390 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) | |
391 | static void end_workqueue_bio(struct bio *bio, int err) | |
392 | #else | |
393 | static int end_workqueue_bio(struct bio *bio, | |
394 | unsigned int bytes_done, int err) | |
395 | #endif | |
396 | { | |
397 | struct end_io_wq *end_io_wq = bio->bi_private; | |
398 | struct btrfs_fs_info *fs_info; | |
ce9adaa5 CM |
399 | |
400 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | |
401 | if (bio->bi_size) | |
402 | return 1; | |
403 | #endif | |
404 | ||
405 | fs_info = end_io_wq->info; | |
ce9adaa5 | 406 | end_io_wq->error = err; |
8b712842 CM |
407 | end_io_wq->work.func = end_workqueue_fn; |
408 | end_io_wq->work.flags = 0; | |
e6dcd2dc CM |
409 | if (bio->bi_rw & (1 << BIO_RW)) |
410 | btrfs_queue_worker(&fs_info->endio_write_workers, | |
411 | &end_io_wq->work); | |
412 | else | |
413 | btrfs_queue_worker(&fs_info->endio_workers, &end_io_wq->work); | |
ce9adaa5 CM |
414 | |
415 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | |
416 | return 0; | |
417 | #endif | |
418 | } | |
419 | ||
22c59948 CM |
420 | int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, |
421 | int metadata) | |
0b86a832 | 422 | { |
ce9adaa5 | 423 | struct end_io_wq *end_io_wq; |
ce9adaa5 CM |
424 | end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); |
425 | if (!end_io_wq) | |
426 | return -ENOMEM; | |
427 | ||
428 | end_io_wq->private = bio->bi_private; | |
429 | end_io_wq->end_io = bio->bi_end_io; | |
22c59948 | 430 | end_io_wq->info = info; |
ce9adaa5 CM |
431 | end_io_wq->error = 0; |
432 | end_io_wq->bio = bio; | |
22c59948 | 433 | end_io_wq->metadata = metadata; |
ce9adaa5 CM |
434 | |
435 | bio->bi_private = end_io_wq; | |
436 | bio->bi_end_io = end_workqueue_bio; | |
22c59948 CM |
437 | return 0; |
438 | } | |
439 | ||
8b712842 CM |
440 | static void run_one_async_submit(struct btrfs_work *work) |
441 | { | |
442 | struct btrfs_fs_info *fs_info; | |
443 | struct async_submit_bio *async; | |
444 | ||
445 | async = container_of(work, struct async_submit_bio, work); | |
446 | fs_info = BTRFS_I(async->inode)->root->fs_info; | |
447 | atomic_dec(&fs_info->nr_async_submits); | |
448 | async->submit_bio_hook(async->inode, async->rw, async->bio, | |
449 | async->mirror_num); | |
450 | kfree(async); | |
451 | } | |
452 | ||
44b8bd7e CM |
453 | int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, |
454 | int rw, struct bio *bio, int mirror_num, | |
455 | extent_submit_bio_hook_t *submit_bio_hook) | |
456 | { | |
457 | struct async_submit_bio *async; | |
458 | ||
459 | async = kmalloc(sizeof(*async), GFP_NOFS); | |
460 | if (!async) | |
461 | return -ENOMEM; | |
462 | ||
463 | async->inode = inode; | |
464 | async->rw = rw; | |
465 | async->bio = bio; | |
466 | async->mirror_num = mirror_num; | |
467 | async->submit_bio_hook = submit_bio_hook; | |
8b712842 CM |
468 | async->work.func = run_one_async_submit; |
469 | async->work.flags = 0; | |
cb03c743 | 470 | atomic_inc(&fs_info->nr_async_submits); |
8b712842 | 471 | btrfs_queue_worker(&fs_info->workers, &async->work); |
44b8bd7e CM |
472 | return 0; |
473 | } | |
474 | ||
475 | static int __btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, | |
f188591e | 476 | int mirror_num) |
22c59948 CM |
477 | { |
478 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
479 | u64 offset; | |
480 | int ret; | |
481 | ||
482 | offset = bio->bi_sector << 9; | |
483 | ||
8b712842 CM |
484 | /* |
485 | * when we're called for a write, we're already in the async | |
486 | * submission context. Just jump ingo btrfs_map_bio | |
487 | */ | |
22c59948 | 488 | if (rw & (1 << BIO_RW)) { |
8b712842 CM |
489 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, |
490 | mirror_num, 0); | |
22c59948 CM |
491 | } |
492 | ||
8b712842 CM |
493 | /* |
494 | * called for a read, do the setup so that checksum validation | |
495 | * can happen in the async kernel threads | |
496 | */ | |
22c59948 CM |
497 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1); |
498 | BUG_ON(ret); | |
ce9adaa5 | 499 | |
8b712842 | 500 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); |
0b86a832 CM |
501 | } |
502 | ||
44b8bd7e CM |
503 | static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
504 | int mirror_num) | |
505 | { | |
8b712842 CM |
506 | /* |
507 | * kthread helpers are used to submit writes so that checksumming | |
508 | * can happen in parallel across all CPUs | |
509 | */ | |
44b8bd7e CM |
510 | if (!(rw & (1 << BIO_RW))) { |
511 | return __btree_submit_bio_hook(inode, rw, bio, mirror_num); | |
512 | } | |
513 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, | |
514 | inode, rw, bio, mirror_num, | |
515 | __btree_submit_bio_hook); | |
516 | } | |
517 | ||
0da5468f CM |
518 | static int btree_writepage(struct page *page, struct writeback_control *wbc) |
519 | { | |
d1310b2e CM |
520 | struct extent_io_tree *tree; |
521 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
5f39d397 CM |
522 | return extent_write_full_page(tree, page, btree_get_extent, wbc); |
523 | } | |
0da5468f CM |
524 | |
525 | static int btree_writepages(struct address_space *mapping, | |
526 | struct writeback_control *wbc) | |
527 | { | |
d1310b2e CM |
528 | struct extent_io_tree *tree; |
529 | tree = &BTRFS_I(mapping->host)->io_tree; | |
d8d5f3e1 | 530 | if (wbc->sync_mode == WB_SYNC_NONE) { |
793955bc CM |
531 | u64 num_dirty; |
532 | u64 start = 0; | |
533 | unsigned long thresh = 96 * 1024 * 1024; | |
448d640b CM |
534 | |
535 | if (wbc->for_kupdate) | |
536 | return 0; | |
537 | ||
ca664626 CM |
538 | if (current_is_pdflush()) { |
539 | thresh = 96 * 1024 * 1024; | |
540 | } else { | |
541 | thresh = 8 * 1024 * 1024; | |
542 | } | |
1832a6d5 CM |
543 | num_dirty = count_range_bits(tree, &start, (u64)-1, |
544 | thresh, EXTENT_DIRTY); | |
793955bc CM |
545 | if (num_dirty < thresh) { |
546 | return 0; | |
547 | } | |
548 | } | |
0da5468f CM |
549 | return extent_writepages(tree, mapping, btree_get_extent, wbc); |
550 | } | |
551 | ||
5f39d397 CM |
552 | int btree_readpage(struct file *file, struct page *page) |
553 | { | |
d1310b2e CM |
554 | struct extent_io_tree *tree; |
555 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
5f39d397 CM |
556 | return extent_read_full_page(tree, page, btree_get_extent); |
557 | } | |
22b0ebda | 558 | |
70dec807 | 559 | static int btree_releasepage(struct page *page, gfp_t gfp_flags) |
5f39d397 | 560 | { |
d1310b2e CM |
561 | struct extent_io_tree *tree; |
562 | struct extent_map_tree *map; | |
5f39d397 | 563 | int ret; |
d98237b3 | 564 | |
d1310b2e CM |
565 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
566 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
6af118ce | 567 | |
7b13b7b1 | 568 | ret = try_release_extent_state(map, tree, page, gfp_flags); |
6af118ce CM |
569 | if (!ret) { |
570 | return 0; | |
571 | } | |
572 | ||
573 | ret = try_release_extent_buffer(tree, page); | |
5f39d397 CM |
574 | if (ret == 1) { |
575 | ClearPagePrivate(page); | |
576 | set_page_private(page, 0); | |
577 | page_cache_release(page); | |
578 | } | |
6af118ce | 579 | |
d98237b3 CM |
580 | return ret; |
581 | } | |
582 | ||
5f39d397 | 583 | static void btree_invalidatepage(struct page *page, unsigned long offset) |
d98237b3 | 584 | { |
d1310b2e CM |
585 | struct extent_io_tree *tree; |
586 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
5f39d397 CM |
587 | extent_invalidatepage(tree, page, offset); |
588 | btree_releasepage(page, GFP_NOFS); | |
9ad6b7bc | 589 | if (PagePrivate(page)) { |
6af118ce CM |
590 | printk("warning page private not zero on page %Lu\n", |
591 | page_offset(page)); | |
9ad6b7bc CM |
592 | ClearPagePrivate(page); |
593 | set_page_private(page, 0); | |
594 | page_cache_release(page); | |
595 | } | |
d98237b3 CM |
596 | } |
597 | ||
5f39d397 | 598 | #if 0 |
d98237b3 | 599 | static int btree_writepage(struct page *page, struct writeback_control *wbc) |
ed2ff2cb | 600 | { |
87cbda5c | 601 | struct buffer_head *bh; |
0f7d52f4 | 602 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; |
87cbda5c | 603 | struct buffer_head *head; |
87cbda5c CM |
604 | if (!page_has_buffers(page)) { |
605 | create_empty_buffers(page, root->fs_info->sb->s_blocksize, | |
606 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
607 | } | |
608 | head = page_buffers(page); | |
609 | bh = head; | |
610 | do { | |
611 | if (buffer_dirty(bh)) | |
612 | csum_tree_block(root, bh, 0); | |
613 | bh = bh->b_this_page; | |
614 | } while (bh != head); | |
d98237b3 | 615 | return block_write_full_page(page, btree_get_block, wbc); |
ed2ff2cb | 616 | } |
5f39d397 | 617 | #endif |
eb60ceac | 618 | |
d98237b3 CM |
619 | static struct address_space_operations btree_aops = { |
620 | .readpage = btree_readpage, | |
621 | .writepage = btree_writepage, | |
0da5468f | 622 | .writepages = btree_writepages, |
5f39d397 CM |
623 | .releasepage = btree_releasepage, |
624 | .invalidatepage = btree_invalidatepage, | |
d98237b3 CM |
625 | .sync_page = block_sync_page, |
626 | }; | |
627 | ||
ca7a79ad CM |
628 | int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, |
629 | u64 parent_transid) | |
090d1875 | 630 | { |
5f39d397 CM |
631 | struct extent_buffer *buf = NULL; |
632 | struct inode *btree_inode = root->fs_info->btree_inode; | |
de428b63 | 633 | int ret = 0; |
090d1875 | 634 | |
db94535d | 635 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
5f39d397 | 636 | if (!buf) |
090d1875 | 637 | return 0; |
d1310b2e | 638 | read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, |
f188591e | 639 | buf, 0, 0, btree_get_extent, 0); |
5f39d397 | 640 | free_extent_buffer(buf); |
de428b63 | 641 | return ret; |
090d1875 CM |
642 | } |
643 | ||
0999df54 CM |
644 | struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, |
645 | u64 bytenr, u32 blocksize) | |
646 | { | |
647 | struct inode *btree_inode = root->fs_info->btree_inode; | |
648 | struct extent_buffer *eb; | |
649 | eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, | |
650 | bytenr, blocksize, GFP_NOFS); | |
651 | return eb; | |
652 | } | |
653 | ||
654 | struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, | |
655 | u64 bytenr, u32 blocksize) | |
656 | { | |
657 | struct inode *btree_inode = root->fs_info->btree_inode; | |
658 | struct extent_buffer *eb; | |
659 | ||
660 | eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, | |
661 | bytenr, blocksize, NULL, GFP_NOFS); | |
662 | return eb; | |
663 | } | |
664 | ||
665 | ||
666 | struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, | |
ca7a79ad | 667 | u32 blocksize, u64 parent_transid) |
0999df54 CM |
668 | { |
669 | struct extent_buffer *buf = NULL; | |
670 | struct inode *btree_inode = root->fs_info->btree_inode; | |
671 | struct extent_io_tree *io_tree; | |
672 | int ret; | |
673 | ||
674 | io_tree = &BTRFS_I(btree_inode)->io_tree; | |
675 | ||
676 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
677 | if (!buf) | |
678 | return NULL; | |
0999df54 | 679 | |
ca7a79ad | 680 | ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
ce9adaa5 CM |
681 | |
682 | if (ret == 0) { | |
683 | buf->flags |= EXTENT_UPTODATE; | |
684 | } | |
5f39d397 | 685 | return buf; |
ce9adaa5 | 686 | |
eb60ceac CM |
687 | } |
688 | ||
e089f05c | 689 | int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5f39d397 | 690 | struct extent_buffer *buf) |
ed2ff2cb | 691 | { |
5f39d397 | 692 | struct inode *btree_inode = root->fs_info->btree_inode; |
55c69072 | 693 | if (btrfs_header_generation(buf) == |
925baedd CM |
694 | root->fs_info->running_transaction->transid) { |
695 | WARN_ON(!btrfs_tree_locked(buf)); | |
d1310b2e | 696 | clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, |
55c69072 | 697 | buf); |
925baedd | 698 | } |
5f39d397 CM |
699 | return 0; |
700 | } | |
701 | ||
702 | int wait_on_tree_block_writeback(struct btrfs_root *root, | |
703 | struct extent_buffer *buf) | |
704 | { | |
705 | struct inode *btree_inode = root->fs_info->btree_inode; | |
d1310b2e | 706 | wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree, |
5f39d397 CM |
707 | buf); |
708 | return 0; | |
709 | } | |
710 | ||
db94535d | 711 | static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, |
87ee04eb | 712 | u32 stripesize, struct btrfs_root *root, |
9f5fae2f | 713 | struct btrfs_fs_info *fs_info, |
e20d96d6 | 714 | u64 objectid) |
d97e63b6 | 715 | { |
cfaa7295 | 716 | root->node = NULL; |
0f7d52f4 | 717 | root->inode = NULL; |
a28ec197 | 718 | root->commit_root = NULL; |
db94535d CM |
719 | root->sectorsize = sectorsize; |
720 | root->nodesize = nodesize; | |
721 | root->leafsize = leafsize; | |
87ee04eb | 722 | root->stripesize = stripesize; |
123abc88 | 723 | root->ref_cows = 0; |
0b86a832 CM |
724 | root->track_dirty = 0; |
725 | ||
9f5fae2f | 726 | root->fs_info = fs_info; |
0f7d52f4 CM |
727 | root->objectid = objectid; |
728 | root->last_trans = 0; | |
1b05da2e CM |
729 | root->highest_inode = 0; |
730 | root->last_inode_alloc = 0; | |
58176a96 | 731 | root->name = NULL; |
4313b399 | 732 | root->in_sysfs = 0; |
0b86a832 CM |
733 | |
734 | INIT_LIST_HEAD(&root->dirty_list); | |
925baedd | 735 | spin_lock_init(&root->node_lock); |
a2135011 | 736 | mutex_init(&root->objectid_mutex); |
3768f368 CM |
737 | memset(&root->root_key, 0, sizeof(root->root_key)); |
738 | memset(&root->root_item, 0, sizeof(root->root_item)); | |
6702ed49 | 739 | memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); |
58176a96 | 740 | memset(&root->root_kobj, 0, sizeof(root->root_kobj)); |
3f157a2f | 741 | root->defrag_trans_start = fs_info->generation; |
58176a96 | 742 | init_completion(&root->kobj_unregister); |
6702ed49 CM |
743 | root->defrag_running = 0; |
744 | root->defrag_level = 0; | |
4d775673 | 745 | root->root_key.objectid = objectid; |
3768f368 CM |
746 | return 0; |
747 | } | |
748 | ||
db94535d | 749 | static int find_and_setup_root(struct btrfs_root *tree_root, |
9f5fae2f CM |
750 | struct btrfs_fs_info *fs_info, |
751 | u64 objectid, | |
e20d96d6 | 752 | struct btrfs_root *root) |
3768f368 CM |
753 | { |
754 | int ret; | |
db94535d | 755 | u32 blocksize; |
3768f368 | 756 | |
db94535d | 757 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
87ee04eb CM |
758 | tree_root->sectorsize, tree_root->stripesize, |
759 | root, fs_info, objectid); | |
3768f368 CM |
760 | ret = btrfs_find_last_root(tree_root, objectid, |
761 | &root->root_item, &root->root_key); | |
762 | BUG_ON(ret); | |
763 | ||
db94535d CM |
764 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
765 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), | |
ca7a79ad | 766 | blocksize, 0); |
3768f368 | 767 | BUG_ON(!root->node); |
d97e63b6 CM |
768 | return 0; |
769 | } | |
770 | ||
5eda7b5e CM |
771 | struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info, |
772 | struct btrfs_key *location) | |
0f7d52f4 CM |
773 | { |
774 | struct btrfs_root *root; | |
775 | struct btrfs_root *tree_root = fs_info->tree_root; | |
776 | struct btrfs_path *path; | |
5f39d397 | 777 | struct extent_buffer *l; |
1b05da2e | 778 | u64 highest_inode; |
db94535d | 779 | u32 blocksize; |
0f7d52f4 CM |
780 | int ret = 0; |
781 | ||
5eda7b5e | 782 | root = kzalloc(sizeof(*root), GFP_NOFS); |
0cf6c620 | 783 | if (!root) |
0f7d52f4 | 784 | return ERR_PTR(-ENOMEM); |
0f7d52f4 | 785 | if (location->offset == (u64)-1) { |
db94535d | 786 | ret = find_and_setup_root(tree_root, fs_info, |
0f7d52f4 CM |
787 | location->objectid, root); |
788 | if (ret) { | |
0f7d52f4 CM |
789 | kfree(root); |
790 | return ERR_PTR(ret); | |
791 | } | |
792 | goto insert; | |
793 | } | |
794 | ||
db94535d | 795 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
87ee04eb CM |
796 | tree_root->sectorsize, tree_root->stripesize, |
797 | root, fs_info, location->objectid); | |
0f7d52f4 CM |
798 | |
799 | path = btrfs_alloc_path(); | |
800 | BUG_ON(!path); | |
801 | ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); | |
802 | if (ret != 0) { | |
0f7d52f4 CM |
803 | if (ret > 0) |
804 | ret = -ENOENT; | |
805 | goto out; | |
806 | } | |
5f39d397 CM |
807 | l = path->nodes[0]; |
808 | read_extent_buffer(l, &root->root_item, | |
809 | btrfs_item_ptr_offset(l, path->slots[0]), | |
0f7d52f4 | 810 | sizeof(root->root_item)); |
44b36eb2 | 811 | memcpy(&root->root_key, location, sizeof(*location)); |
0f7d52f4 CM |
812 | ret = 0; |
813 | out: | |
814 | btrfs_release_path(root, path); | |
815 | btrfs_free_path(path); | |
816 | if (ret) { | |
817 | kfree(root); | |
818 | return ERR_PTR(ret); | |
819 | } | |
db94535d CM |
820 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
821 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), | |
ca7a79ad | 822 | blocksize, 0); |
0f7d52f4 CM |
823 | BUG_ON(!root->node); |
824 | insert: | |
0f7d52f4 | 825 | root->ref_cows = 1; |
5eda7b5e CM |
826 | ret = btrfs_find_highest_inode(root, &highest_inode); |
827 | if (ret == 0) { | |
828 | root->highest_inode = highest_inode; | |
829 | root->last_inode_alloc = highest_inode; | |
830 | } | |
831 | return root; | |
832 | } | |
833 | ||
dc17ff8f CM |
834 | struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, |
835 | u64 root_objectid) | |
836 | { | |
837 | struct btrfs_root *root; | |
838 | ||
839 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID) | |
840 | return fs_info->tree_root; | |
841 | if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID) | |
842 | return fs_info->extent_root; | |
843 | ||
844 | root = radix_tree_lookup(&fs_info->fs_roots_radix, | |
845 | (unsigned long)root_objectid); | |
846 | return root; | |
847 | } | |
848 | ||
edbd8d4e CM |
849 | struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, |
850 | struct btrfs_key *location) | |
5eda7b5e CM |
851 | { |
852 | struct btrfs_root *root; | |
853 | int ret; | |
854 | ||
edbd8d4e CM |
855 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) |
856 | return fs_info->tree_root; | |
857 | if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) | |
858 | return fs_info->extent_root; | |
8f18cf13 CM |
859 | if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) |
860 | return fs_info->chunk_root; | |
861 | if (location->objectid == BTRFS_DEV_TREE_OBJECTID) | |
862 | return fs_info->dev_root; | |
edbd8d4e | 863 | |
5eda7b5e CM |
864 | root = radix_tree_lookup(&fs_info->fs_roots_radix, |
865 | (unsigned long)location->objectid); | |
866 | if (root) | |
867 | return root; | |
868 | ||
869 | root = btrfs_read_fs_root_no_radix(fs_info, location); | |
870 | if (IS_ERR(root)) | |
871 | return root; | |
2619ba1f CM |
872 | ret = radix_tree_insert(&fs_info->fs_roots_radix, |
873 | (unsigned long)root->root_key.objectid, | |
0f7d52f4 CM |
874 | root); |
875 | if (ret) { | |
5f39d397 | 876 | free_extent_buffer(root->node); |
0f7d52f4 CM |
877 | kfree(root); |
878 | return ERR_PTR(ret); | |
879 | } | |
edbd8d4e CM |
880 | ret = btrfs_find_dead_roots(fs_info->tree_root, |
881 | root->root_key.objectid, root); | |
882 | BUG_ON(ret); | |
883 | ||
884 | return root; | |
885 | } | |
886 | ||
887 | struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, | |
888 | struct btrfs_key *location, | |
889 | const char *name, int namelen) | |
890 | { | |
891 | struct btrfs_root *root; | |
892 | int ret; | |
893 | ||
894 | root = btrfs_read_fs_root_no_name(fs_info, location); | |
895 | if (!root) | |
896 | return NULL; | |
58176a96 | 897 | |
4313b399 CM |
898 | if (root->in_sysfs) |
899 | return root; | |
900 | ||
58176a96 JB |
901 | ret = btrfs_set_root_name(root, name, namelen); |
902 | if (ret) { | |
5f39d397 | 903 | free_extent_buffer(root->node); |
58176a96 JB |
904 | kfree(root); |
905 | return ERR_PTR(ret); | |
906 | } | |
907 | ||
908 | ret = btrfs_sysfs_add_root(root); | |
909 | if (ret) { | |
5f39d397 | 910 | free_extent_buffer(root->node); |
58176a96 JB |
911 | kfree(root->name); |
912 | kfree(root); | |
913 | return ERR_PTR(ret); | |
914 | } | |
4313b399 | 915 | root->in_sysfs = 1; |
0f7d52f4 CM |
916 | return root; |
917 | } | |
19c00ddc CM |
918 | #if 0 |
919 | static int add_hasher(struct btrfs_fs_info *info, char *type) { | |
920 | struct btrfs_hasher *hasher; | |
921 | ||
922 | hasher = kmalloc(sizeof(*hasher), GFP_NOFS); | |
923 | if (!hasher) | |
924 | return -ENOMEM; | |
925 | hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC); | |
926 | if (!hasher->hash_tfm) { | |
927 | kfree(hasher); | |
928 | return -EINVAL; | |
929 | } | |
930 | spin_lock(&info->hash_lock); | |
931 | list_add(&hasher->list, &info->hashers); | |
932 | spin_unlock(&info->hash_lock); | |
933 | return 0; | |
934 | } | |
935 | #endif | |
04160088 CM |
936 | |
937 | static int btrfs_congested_fn(void *congested_data, int bdi_bits) | |
938 | { | |
939 | struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; | |
940 | int ret = 0; | |
cb03c743 | 941 | int limit = 256 * info->fs_devices->open_devices; |
04160088 CM |
942 | struct list_head *cur; |
943 | struct btrfs_device *device; | |
944 | struct backing_dev_info *bdi; | |
945 | ||
cb03c743 CM |
946 | if ((bdi_bits & (1 << BDI_write_congested)) && |
947 | atomic_read(&info->nr_async_submits) > limit) { | |
948 | return 1; | |
949 | } | |
950 | ||
04160088 CM |
951 | list_for_each(cur, &info->fs_devices->devices) { |
952 | device = list_entry(cur, struct btrfs_device, dev_list); | |
dfe25020 CM |
953 | if (!device->bdev) |
954 | continue; | |
04160088 CM |
955 | bdi = blk_get_backing_dev_info(device->bdev); |
956 | if (bdi && bdi_congested(bdi, bdi_bits)) { | |
957 | ret = 1; | |
958 | break; | |
959 | } | |
960 | } | |
961 | return ret; | |
962 | } | |
963 | ||
38b66988 CM |
964 | /* |
965 | * this unplugs every device on the box, and it is only used when page | |
966 | * is null | |
967 | */ | |
968 | static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page) | |
969 | { | |
970 | struct list_head *cur; | |
971 | struct btrfs_device *device; | |
972 | struct btrfs_fs_info *info; | |
973 | ||
974 | info = (struct btrfs_fs_info *)bdi->unplug_io_data; | |
975 | list_for_each(cur, &info->fs_devices->devices) { | |
976 | device = list_entry(cur, struct btrfs_device, dev_list); | |
977 | bdi = blk_get_backing_dev_info(device->bdev); | |
978 | if (bdi->unplug_io_fn) { | |
979 | bdi->unplug_io_fn(bdi, page); | |
980 | } | |
981 | } | |
982 | } | |
983 | ||
04160088 CM |
984 | void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) |
985 | { | |
38b66988 | 986 | struct inode *inode; |
f2d8d74d CM |
987 | struct extent_map_tree *em_tree; |
988 | struct extent_map *em; | |
bcbfce8a | 989 | struct address_space *mapping; |
38b66988 CM |
990 | u64 offset; |
991 | ||
bcbfce8a | 992 | /* the generic O_DIRECT read code does this */ |
38b66988 CM |
993 | if (!page) { |
994 | __unplug_io_fn(bdi, page); | |
995 | return; | |
996 | } | |
997 | ||
bcbfce8a CM |
998 | /* |
999 | * page->mapping may change at any time. Get a consistent copy | |
1000 | * and use that for everything below | |
1001 | */ | |
1002 | smp_mb(); | |
1003 | mapping = page->mapping; | |
1004 | if (!mapping) | |
1005 | return; | |
1006 | ||
1007 | inode = mapping->host; | |
38b66988 | 1008 | offset = page_offset(page); |
04160088 | 1009 | |
f2d8d74d CM |
1010 | em_tree = &BTRFS_I(inode)->extent_tree; |
1011 | spin_lock(&em_tree->lock); | |
1012 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); | |
1013 | spin_unlock(&em_tree->lock); | |
89642229 CM |
1014 | if (!em) { |
1015 | __unplug_io_fn(bdi, page); | |
f2d8d74d | 1016 | return; |
89642229 | 1017 | } |
f2d8d74d | 1018 | |
89642229 CM |
1019 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
1020 | free_extent_map(em); | |
1021 | __unplug_io_fn(bdi, page); | |
1022 | return; | |
1023 | } | |
f2d8d74d CM |
1024 | offset = offset - em->start; |
1025 | btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree, | |
1026 | em->block_start + offset, page); | |
1027 | free_extent_map(em); | |
04160088 CM |
1028 | } |
1029 | ||
1030 | static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) | |
1031 | { | |
51ebc0d3 | 1032 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
04160088 | 1033 | bdi_init(bdi); |
b248a415 | 1034 | #endif |
4575c9cc | 1035 | bdi->ra_pages = default_backing_dev_info.ra_pages; |
04160088 CM |
1036 | bdi->state = 0; |
1037 | bdi->capabilities = default_backing_dev_info.capabilities; | |
1038 | bdi->unplug_io_fn = btrfs_unplug_io_fn; | |
1039 | bdi->unplug_io_data = info; | |
1040 | bdi->congested_fn = btrfs_congested_fn; | |
1041 | bdi->congested_data = info; | |
1042 | return 0; | |
1043 | } | |
1044 | ||
ce9adaa5 CM |
1045 | static int bio_ready_for_csum(struct bio *bio) |
1046 | { | |
1047 | u64 length = 0; | |
1048 | u64 buf_len = 0; | |
1049 | u64 start = 0; | |
1050 | struct page *page; | |
1051 | struct extent_io_tree *io_tree = NULL; | |
1052 | struct btrfs_fs_info *info = NULL; | |
1053 | struct bio_vec *bvec; | |
1054 | int i; | |
1055 | int ret; | |
1056 | ||
1057 | bio_for_each_segment(bvec, bio, i) { | |
1058 | page = bvec->bv_page; | |
1059 | if (page->private == EXTENT_PAGE_PRIVATE) { | |
1060 | length += bvec->bv_len; | |
1061 | continue; | |
1062 | } | |
1063 | if (!page->private) { | |
1064 | length += bvec->bv_len; | |
1065 | continue; | |
1066 | } | |
1067 | length = bvec->bv_len; | |
1068 | buf_len = page->private >> 2; | |
1069 | start = page_offset(page) + bvec->bv_offset; | |
1070 | io_tree = &BTRFS_I(page->mapping->host)->io_tree; | |
1071 | info = BTRFS_I(page->mapping->host)->root->fs_info; | |
1072 | } | |
1073 | /* are we fully contained in this bio? */ | |
1074 | if (buf_len <= length) | |
1075 | return 1; | |
1076 | ||
1077 | ret = extent_range_uptodate(io_tree, start + length, | |
1078 | start + buf_len - 1); | |
1079 | if (ret == 1) | |
1080 | return ret; | |
1081 | return ret; | |
1082 | } | |
1083 | ||
8b712842 CM |
1084 | /* |
1085 | * called by the kthread helper functions to finally call the bio end_io | |
1086 | * functions. This is where read checksum verification actually happens | |
1087 | */ | |
1088 | static void end_workqueue_fn(struct btrfs_work *work) | |
ce9adaa5 | 1089 | { |
ce9adaa5 | 1090 | struct bio *bio; |
8b712842 CM |
1091 | struct end_io_wq *end_io_wq; |
1092 | struct btrfs_fs_info *fs_info; | |
ce9adaa5 | 1093 | int error; |
ce9adaa5 | 1094 | |
8b712842 CM |
1095 | end_io_wq = container_of(work, struct end_io_wq, work); |
1096 | bio = end_io_wq->bio; | |
1097 | fs_info = end_io_wq->info; | |
ce9adaa5 | 1098 | |
8b712842 CM |
1099 | /* metadata bios are special because the whole tree block must |
1100 | * be checksummed at once. This makes sure the entire block is in | |
1101 | * ram and up to date before trying to verify things. For | |
1102 | * blocksize <= pagesize, it is basically a noop | |
1103 | */ | |
1104 | if (end_io_wq->metadata && !bio_ready_for_csum(bio)) { | |
1105 | btrfs_queue_worker(&fs_info->endio_workers, | |
1106 | &end_io_wq->work); | |
1107 | return; | |
1108 | } | |
1109 | error = end_io_wq->error; | |
1110 | bio->bi_private = end_io_wq->private; | |
1111 | bio->bi_end_io = end_io_wq->end_io; | |
1112 | kfree(end_io_wq); | |
1113 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) | |
1114 | bio_endio(bio, bio->bi_size, error); | |
44b8bd7e | 1115 | #else |
8b712842 | 1116 | bio_endio(bio, error); |
44b8bd7e | 1117 | #endif |
44b8bd7e CM |
1118 | } |
1119 | ||
a74a4b97 CM |
1120 | static int cleaner_kthread(void *arg) |
1121 | { | |
1122 | struct btrfs_root *root = arg; | |
1123 | ||
1124 | do { | |
1125 | smp_mb(); | |
1126 | if (root->fs_info->closing) | |
1127 | break; | |
1128 | ||
1129 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); | |
1130 | mutex_lock(&root->fs_info->cleaner_mutex); | |
a74a4b97 | 1131 | btrfs_clean_old_snapshots(root); |
a74a4b97 CM |
1132 | mutex_unlock(&root->fs_info->cleaner_mutex); |
1133 | ||
1134 | if (freezing(current)) { | |
1135 | refrigerator(); | |
1136 | } else { | |
1137 | smp_mb(); | |
1138 | if (root->fs_info->closing) | |
1139 | break; | |
1140 | set_current_state(TASK_INTERRUPTIBLE); | |
1141 | schedule(); | |
1142 | __set_current_state(TASK_RUNNING); | |
1143 | } | |
1144 | } while (!kthread_should_stop()); | |
1145 | return 0; | |
1146 | } | |
1147 | ||
1148 | static int transaction_kthread(void *arg) | |
1149 | { | |
1150 | struct btrfs_root *root = arg; | |
1151 | struct btrfs_trans_handle *trans; | |
1152 | struct btrfs_transaction *cur; | |
1153 | unsigned long now; | |
1154 | unsigned long delay; | |
1155 | int ret; | |
1156 | ||
1157 | do { | |
1158 | smp_mb(); | |
1159 | if (root->fs_info->closing) | |
1160 | break; | |
1161 | ||
1162 | delay = HZ * 30; | |
1163 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); | |
1164 | mutex_lock(&root->fs_info->transaction_kthread_mutex); | |
1165 | ||
1166 | mutex_lock(&root->fs_info->trans_mutex); | |
1167 | cur = root->fs_info->running_transaction; | |
1168 | if (!cur) { | |
1169 | mutex_unlock(&root->fs_info->trans_mutex); | |
1170 | goto sleep; | |
1171 | } | |
1172 | now = get_seconds(); | |
1173 | if (now < cur->start_time || now - cur->start_time < 30) { | |
1174 | mutex_unlock(&root->fs_info->trans_mutex); | |
1175 | delay = HZ * 5; | |
1176 | goto sleep; | |
1177 | } | |
1178 | mutex_unlock(&root->fs_info->trans_mutex); | |
a74a4b97 CM |
1179 | trans = btrfs_start_transaction(root, 1); |
1180 | ret = btrfs_commit_transaction(trans, root); | |
1181 | sleep: | |
1182 | wake_up_process(root->fs_info->cleaner_kthread); | |
1183 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
1184 | ||
1185 | if (freezing(current)) { | |
1186 | refrigerator(); | |
1187 | } else { | |
1188 | if (root->fs_info->closing) | |
1189 | break; | |
1190 | set_current_state(TASK_INTERRUPTIBLE); | |
1191 | schedule_timeout(delay); | |
1192 | __set_current_state(TASK_RUNNING); | |
1193 | } | |
1194 | } while (!kthread_should_stop()); | |
1195 | return 0; | |
1196 | } | |
1197 | ||
8a4b83cc | 1198 | struct btrfs_root *open_ctree(struct super_block *sb, |
dfe25020 CM |
1199 | struct btrfs_fs_devices *fs_devices, |
1200 | char *options) | |
2e635a27 | 1201 | { |
db94535d CM |
1202 | u32 sectorsize; |
1203 | u32 nodesize; | |
1204 | u32 leafsize; | |
1205 | u32 blocksize; | |
87ee04eb | 1206 | u32 stripesize; |
a061fc8d | 1207 | struct buffer_head *bh; |
e20d96d6 CM |
1208 | struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root), |
1209 | GFP_NOFS); | |
1210 | struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root), | |
1211 | GFP_NOFS); | |
8790d502 | 1212 | struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info), |
e20d96d6 | 1213 | GFP_NOFS); |
0b86a832 CM |
1214 | struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root), |
1215 | GFP_NOFS); | |
1216 | struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root), | |
1217 | GFP_NOFS); | |
eb60ceac | 1218 | int ret; |
e58ca020 | 1219 | int err = -EINVAL; |
4543df7e | 1220 | |
2c90e5d6 | 1221 | struct btrfs_super_block *disk_super; |
8790d502 | 1222 | |
39279cc3 CM |
1223 | if (!extent_root || !tree_root || !fs_info) { |
1224 | err = -ENOMEM; | |
1225 | goto fail; | |
1226 | } | |
0f7d52f4 | 1227 | INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS); |
8fd17795 | 1228 | INIT_LIST_HEAD(&fs_info->trans_list); |
facda1e7 | 1229 | INIT_LIST_HEAD(&fs_info->dead_roots); |
19c00ddc CM |
1230 | INIT_LIST_HEAD(&fs_info->hashers); |
1231 | spin_lock_init(&fs_info->hash_lock); | |
1832a6d5 | 1232 | spin_lock_init(&fs_info->delalloc_lock); |
cee36a03 | 1233 | spin_lock_init(&fs_info->new_trans_lock); |
19c00ddc | 1234 | |
58176a96 | 1235 | init_completion(&fs_info->kobj_unregister); |
9f5fae2f CM |
1236 | fs_info->tree_root = tree_root; |
1237 | fs_info->extent_root = extent_root; | |
0b86a832 CM |
1238 | fs_info->chunk_root = chunk_root; |
1239 | fs_info->dev_root = dev_root; | |
8a4b83cc | 1240 | fs_info->fs_devices = fs_devices; |
0b86a832 | 1241 | INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); |
6324fbf3 | 1242 | INIT_LIST_HEAD(&fs_info->space_info); |
0b86a832 | 1243 | btrfs_mapping_init(&fs_info->mapping_tree); |
cb03c743 | 1244 | atomic_set(&fs_info->nr_async_submits, 0); |
a2135011 | 1245 | atomic_set(&fs_info->throttles, 0); |
e20d96d6 | 1246 | fs_info->sb = sb; |
c59f8951 | 1247 | fs_info->max_extent = (u64)-1; |
6f568d35 | 1248 | fs_info->max_inline = 8192 * 1024; |
04160088 | 1249 | setup_bdi(fs_info, &fs_info->bdi); |
d98237b3 CM |
1250 | fs_info->btree_inode = new_inode(sb); |
1251 | fs_info->btree_inode->i_ino = 1; | |
2c90e5d6 | 1252 | fs_info->btree_inode->i_nlink = 1; |
4543df7e | 1253 | fs_info->thread_pool_size = min(num_online_cpus() + 2, 8); |
0afbaf8c | 1254 | |
a061fc8d CM |
1255 | sb->s_blocksize = 4096; |
1256 | sb->s_blocksize_bits = blksize_bits(4096); | |
1257 | ||
0afbaf8c CM |
1258 | /* |
1259 | * we set the i_size on the btree inode to the max possible int. | |
1260 | * the real end of the address space is determined by all of | |
1261 | * the devices in the system | |
1262 | */ | |
1263 | fs_info->btree_inode->i_size = OFFSET_MAX; | |
d98237b3 | 1264 | fs_info->btree_inode->i_mapping->a_ops = &btree_aops; |
04160088 CM |
1265 | fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; |
1266 | ||
d1310b2e | 1267 | extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, |
5f39d397 CM |
1268 | fs_info->btree_inode->i_mapping, |
1269 | GFP_NOFS); | |
d1310b2e CM |
1270 | extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, |
1271 | GFP_NOFS); | |
1272 | ||
1273 | BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; | |
0da5468f | 1274 | |
d1310b2e | 1275 | extent_io_tree_init(&fs_info->free_space_cache, |
f510cfec | 1276 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
d1310b2e | 1277 | extent_io_tree_init(&fs_info->block_group_cache, |
96b5179d | 1278 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
d1310b2e | 1279 | extent_io_tree_init(&fs_info->pinned_extents, |
1a5bc167 | 1280 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
d1310b2e | 1281 | extent_io_tree_init(&fs_info->pending_del, |
1a5bc167 | 1282 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
d1310b2e | 1283 | extent_io_tree_init(&fs_info->extent_ins, |
1a5bc167 | 1284 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
e66f709b | 1285 | fs_info->do_barriers = 1; |
e18e4809 | 1286 | |
0f7d52f4 CM |
1287 | BTRFS_I(fs_info->btree_inode)->root = tree_root; |
1288 | memset(&BTRFS_I(fs_info->btree_inode)->location, 0, | |
1289 | sizeof(struct btrfs_key)); | |
22b0ebda | 1290 | insert_inode_hash(fs_info->btree_inode); |
d98237b3 | 1291 | mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); |
39279cc3 | 1292 | |
79154b1b | 1293 | mutex_init(&fs_info->trans_mutex); |
a2135011 | 1294 | mutex_init(&fs_info->drop_mutex); |
925baedd CM |
1295 | mutex_init(&fs_info->alloc_mutex); |
1296 | mutex_init(&fs_info->chunk_mutex); | |
a74a4b97 CM |
1297 | mutex_init(&fs_info->transaction_kthread_mutex); |
1298 | mutex_init(&fs_info->cleaner_mutex); | |
7d9eb12c | 1299 | mutex_init(&fs_info->volume_mutex); |
e6dcd2dc | 1300 | init_waitqueue_head(&fs_info->transaction_throttle); |
f9295749 | 1301 | init_waitqueue_head(&fs_info->transaction_wait); |
3768f368 | 1302 | |
19c00ddc CM |
1303 | #if 0 |
1304 | ret = add_hasher(fs_info, "crc32c"); | |
1305 | if (ret) { | |
1306 | printk("btrfs: failed hash setup, modprobe cryptomgr?\n"); | |
1307 | err = -ENOMEM; | |
1308 | goto fail_iput; | |
1309 | } | |
1310 | #endif | |
0b86a832 | 1311 | __setup_root(4096, 4096, 4096, 4096, tree_root, |
2c90e5d6 | 1312 | fs_info, BTRFS_ROOT_TREE_OBJECTID); |
7eccb903 | 1313 | |
d98237b3 | 1314 | |
a061fc8d CM |
1315 | bh = __bread(fs_devices->latest_bdev, |
1316 | BTRFS_SUPER_INFO_OFFSET / 4096, 4096); | |
1317 | if (!bh) | |
39279cc3 | 1318 | goto fail_iput; |
39279cc3 | 1319 | |
a061fc8d CM |
1320 | memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy)); |
1321 | brelse(bh); | |
5f39d397 | 1322 | |
a061fc8d | 1323 | memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE); |
0b86a832 | 1324 | |
5f39d397 | 1325 | disk_super = &fs_info->super_copy; |
0f7d52f4 | 1326 | if (!btrfs_super_root(disk_super)) |
39279cc3 | 1327 | goto fail_sb_buffer; |
0f7d52f4 | 1328 | |
edf24abe CH |
1329 | err = btrfs_parse_options(tree_root, options); |
1330 | if (err) | |
1331 | goto fail_sb_buffer; | |
dfe25020 | 1332 | |
4543df7e CM |
1333 | /* |
1334 | * we need to start all the end_io workers up front because the | |
1335 | * queue work function gets called at interrupt time, and so it | |
1336 | * cannot dynamically grow. | |
1337 | */ | |
1338 | btrfs_init_workers(&fs_info->workers, fs_info->thread_pool_size); | |
1cc127b5 | 1339 | btrfs_init_workers(&fs_info->submit_workers, fs_info->thread_pool_size); |
247e743c | 1340 | btrfs_init_workers(&fs_info->fixup_workers, 1); |
4543df7e | 1341 | btrfs_init_workers(&fs_info->endio_workers, fs_info->thread_pool_size); |
e6dcd2dc CM |
1342 | btrfs_init_workers(&fs_info->endio_write_workers, |
1343 | fs_info->thread_pool_size); | |
4543df7e | 1344 | btrfs_start_workers(&fs_info->workers, 1); |
1cc127b5 | 1345 | btrfs_start_workers(&fs_info->submit_workers, 1); |
247e743c | 1346 | btrfs_start_workers(&fs_info->fixup_workers, 1); |
4543df7e | 1347 | btrfs_start_workers(&fs_info->endio_workers, fs_info->thread_pool_size); |
e6dcd2dc CM |
1348 | btrfs_start_workers(&fs_info->endio_write_workers, |
1349 | fs_info->thread_pool_size); | |
4543df7e | 1350 | |
edf24abe | 1351 | err = -EINVAL; |
a0af469b | 1352 | if (btrfs_super_num_devices(disk_super) > fs_devices->open_devices) { |
8a4b83cc CM |
1353 | printk("Btrfs: wanted %llu devices, but found %llu\n", |
1354 | (unsigned long long)btrfs_super_num_devices(disk_super), | |
a0af469b | 1355 | (unsigned long long)fs_devices->open_devices); |
dfe25020 CM |
1356 | if (btrfs_test_opt(tree_root, DEGRADED)) |
1357 | printk("continuing in degraded mode\n"); | |
1358 | else { | |
1359 | goto fail_sb_buffer; | |
1360 | } | |
8a4b83cc | 1361 | } |
dfe25020 | 1362 | |
4575c9cc CM |
1363 | fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); |
1364 | ||
db94535d CM |
1365 | nodesize = btrfs_super_nodesize(disk_super); |
1366 | leafsize = btrfs_super_leafsize(disk_super); | |
1367 | sectorsize = btrfs_super_sectorsize(disk_super); | |
87ee04eb | 1368 | stripesize = btrfs_super_stripesize(disk_super); |
db94535d CM |
1369 | tree_root->nodesize = nodesize; |
1370 | tree_root->leafsize = leafsize; | |
1371 | tree_root->sectorsize = sectorsize; | |
87ee04eb | 1372 | tree_root->stripesize = stripesize; |
a061fc8d CM |
1373 | |
1374 | sb->s_blocksize = sectorsize; | |
1375 | sb->s_blocksize_bits = blksize_bits(sectorsize); | |
db94535d | 1376 | |
39279cc3 CM |
1377 | if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, |
1378 | sizeof(disk_super->magic))) { | |
1379 | printk("btrfs: valid FS not found on %s\n", sb->s_id); | |
1380 | goto fail_sb_buffer; | |
1381 | } | |
19c00ddc | 1382 | |
925baedd | 1383 | mutex_lock(&fs_info->chunk_mutex); |
0b86a832 | 1384 | ret = btrfs_read_sys_array(tree_root); |
925baedd | 1385 | mutex_unlock(&fs_info->chunk_mutex); |
84eed90f CM |
1386 | if (ret) { |
1387 | printk("btrfs: failed to read the system array on %s\n", | |
1388 | sb->s_id); | |
1389 | goto fail_sys_array; | |
1390 | } | |
0b86a832 CM |
1391 | |
1392 | blocksize = btrfs_level_size(tree_root, | |
1393 | btrfs_super_chunk_root_level(disk_super)); | |
1394 | ||
1395 | __setup_root(nodesize, leafsize, sectorsize, stripesize, | |
1396 | chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); | |
1397 | ||
1398 | chunk_root->node = read_tree_block(chunk_root, | |
1399 | btrfs_super_chunk_root(disk_super), | |
ca7a79ad | 1400 | blocksize, 0); |
0b86a832 CM |
1401 | BUG_ON(!chunk_root->node); |
1402 | ||
e17cade2 CM |
1403 | read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, |
1404 | (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), | |
1405 | BTRFS_UUID_SIZE); | |
1406 | ||
925baedd | 1407 | mutex_lock(&fs_info->chunk_mutex); |
0b86a832 | 1408 | ret = btrfs_read_chunk_tree(chunk_root); |
925baedd | 1409 | mutex_unlock(&fs_info->chunk_mutex); |
0b86a832 CM |
1410 | BUG_ON(ret); |
1411 | ||
dfe25020 CM |
1412 | btrfs_close_extra_devices(fs_devices); |
1413 | ||
db94535d CM |
1414 | blocksize = btrfs_level_size(tree_root, |
1415 | btrfs_super_root_level(disk_super)); | |
19c00ddc | 1416 | |
0b86a832 | 1417 | |
e20d96d6 | 1418 | tree_root->node = read_tree_block(tree_root, |
db94535d | 1419 | btrfs_super_root(disk_super), |
ca7a79ad | 1420 | blocksize, 0); |
39279cc3 CM |
1421 | if (!tree_root->node) |
1422 | goto fail_sb_buffer; | |
3768f368 | 1423 | |
db94535d CM |
1424 | |
1425 | ret = find_and_setup_root(tree_root, fs_info, | |
e20d96d6 | 1426 | BTRFS_EXTENT_TREE_OBJECTID, extent_root); |
0b86a832 | 1427 | if (ret) |
39279cc3 | 1428 | goto fail_tree_root; |
0b86a832 CM |
1429 | extent_root->track_dirty = 1; |
1430 | ||
1431 | ret = find_and_setup_root(tree_root, fs_info, | |
1432 | BTRFS_DEV_TREE_OBJECTID, dev_root); | |
1433 | dev_root->track_dirty = 1; | |
1434 | ||
1435 | if (ret) | |
1436 | goto fail_extent_root; | |
3768f368 | 1437 | |
9078a3e1 CM |
1438 | btrfs_read_block_groups(extent_root); |
1439 | ||
0f7d52f4 | 1440 | fs_info->generation = btrfs_super_generation(disk_super) + 1; |
d18a2c44 CM |
1441 | fs_info->data_alloc_profile = (u64)-1; |
1442 | fs_info->metadata_alloc_profile = (u64)-1; | |
1443 | fs_info->system_alloc_profile = fs_info->metadata_alloc_profile; | |
a74a4b97 CM |
1444 | fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, |
1445 | "btrfs-cleaner"); | |
1446 | if (!fs_info->cleaner_kthread) | |
1447 | goto fail_extent_root; | |
1448 | ||
1449 | fs_info->transaction_kthread = kthread_run(transaction_kthread, | |
1450 | tree_root, | |
1451 | "btrfs-transaction"); | |
1452 | if (!fs_info->transaction_kthread) | |
3f157a2f | 1453 | goto fail_cleaner; |
a74a4b97 | 1454 | |
d18a2c44 | 1455 | |
0f7d52f4 | 1456 | return tree_root; |
39279cc3 | 1457 | |
3f157a2f | 1458 | fail_cleaner: |
a74a4b97 | 1459 | kthread_stop(fs_info->cleaner_kthread); |
0b86a832 CM |
1460 | fail_extent_root: |
1461 | free_extent_buffer(extent_root->node); | |
39279cc3 | 1462 | fail_tree_root: |
5f39d397 | 1463 | free_extent_buffer(tree_root->node); |
84eed90f | 1464 | fail_sys_array: |
39279cc3 | 1465 | fail_sb_buffer: |
247e743c | 1466 | btrfs_stop_workers(&fs_info->fixup_workers); |
8b712842 CM |
1467 | btrfs_stop_workers(&fs_info->workers); |
1468 | btrfs_stop_workers(&fs_info->endio_workers); | |
e6dcd2dc | 1469 | btrfs_stop_workers(&fs_info->endio_write_workers); |
1cc127b5 | 1470 | btrfs_stop_workers(&fs_info->submit_workers); |
4543df7e CM |
1471 | fail_iput: |
1472 | iput(fs_info->btree_inode); | |
39279cc3 | 1473 | fail: |
dfe25020 | 1474 | btrfs_close_devices(fs_info->fs_devices); |
84eed90f CM |
1475 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
1476 | ||
39279cc3 CM |
1477 | kfree(extent_root); |
1478 | kfree(tree_root); | |
51ebc0d3 | 1479 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2d2ae547 | 1480 | bdi_destroy(&fs_info->bdi); |
b248a415 | 1481 | #endif |
39279cc3 CM |
1482 | kfree(fs_info); |
1483 | return ERR_PTR(err); | |
eb60ceac CM |
1484 | } |
1485 | ||
f2984462 CM |
1486 | static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) |
1487 | { | |
1488 | char b[BDEVNAME_SIZE]; | |
1489 | ||
1490 | if (uptodate) { | |
1491 | set_buffer_uptodate(bh); | |
1492 | } else { | |
1493 | if (!buffer_eopnotsupp(bh) && printk_ratelimit()) { | |
1494 | printk(KERN_WARNING "lost page write due to " | |
1495 | "I/O error on %s\n", | |
1496 | bdevname(bh->b_bdev, b)); | |
1497 | } | |
1259ab75 CM |
1498 | /* note, we dont' set_buffer_write_io_error because we have |
1499 | * our own ways of dealing with the IO errors | |
1500 | */ | |
f2984462 CM |
1501 | clear_buffer_uptodate(bh); |
1502 | } | |
1503 | unlock_buffer(bh); | |
1504 | put_bh(bh); | |
1505 | } | |
1506 | ||
1507 | int write_all_supers(struct btrfs_root *root) | |
1508 | { | |
1509 | struct list_head *cur; | |
1510 | struct list_head *head = &root->fs_info->fs_devices->devices; | |
1511 | struct btrfs_device *dev; | |
a061fc8d | 1512 | struct btrfs_super_block *sb; |
f2984462 CM |
1513 | struct btrfs_dev_item *dev_item; |
1514 | struct buffer_head *bh; | |
1515 | int ret; | |
1516 | int do_barriers; | |
a236aed1 CM |
1517 | int max_errors; |
1518 | int total_errors = 0; | |
a061fc8d CM |
1519 | u32 crc; |
1520 | u64 flags; | |
f2984462 | 1521 | |
a236aed1 | 1522 | max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; |
f2984462 CM |
1523 | do_barriers = !btrfs_test_opt(root, NOBARRIER); |
1524 | ||
a061fc8d CM |
1525 | sb = &root->fs_info->super_for_commit; |
1526 | dev_item = &sb->dev_item; | |
f2984462 CM |
1527 | list_for_each(cur, head) { |
1528 | dev = list_entry(cur, struct btrfs_device, dev_list); | |
dfe25020 CM |
1529 | if (!dev->bdev) { |
1530 | total_errors++; | |
1531 | continue; | |
1532 | } | |
1533 | if (!dev->in_fs_metadata) | |
1534 | continue; | |
1535 | ||
a061fc8d CM |
1536 | btrfs_set_stack_device_type(dev_item, dev->type); |
1537 | btrfs_set_stack_device_id(dev_item, dev->devid); | |
1538 | btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); | |
1539 | btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); | |
1540 | btrfs_set_stack_device_io_align(dev_item, dev->io_align); | |
1541 | btrfs_set_stack_device_io_width(dev_item, dev->io_width); | |
1542 | btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); | |
1543 | memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); | |
1544 | flags = btrfs_super_flags(sb); | |
1545 | btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); | |
1546 | ||
1547 | ||
1548 | crc = ~(u32)0; | |
1549 | crc = btrfs_csum_data(root, (char *)sb + BTRFS_CSUM_SIZE, crc, | |
1550 | BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE); | |
1551 | btrfs_csum_final(crc, sb->csum); | |
1552 | ||
1553 | bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET / 4096, | |
f2984462 CM |
1554 | BTRFS_SUPER_INFO_SIZE); |
1555 | ||
a061fc8d | 1556 | memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); |
f2984462 CM |
1557 | dev->pending_io = bh; |
1558 | ||
1559 | get_bh(bh); | |
1560 | set_buffer_uptodate(bh); | |
1561 | lock_buffer(bh); | |
1562 | bh->b_end_io = btrfs_end_buffer_write_sync; | |
1563 | ||
1564 | if (do_barriers && dev->barriers) { | |
1565 | ret = submit_bh(WRITE_BARRIER, bh); | |
1566 | if (ret == -EOPNOTSUPP) { | |
1567 | printk("btrfs: disabling barriers on dev %s\n", | |
1568 | dev->name); | |
1569 | set_buffer_uptodate(bh); | |
1570 | dev->barriers = 0; | |
1571 | get_bh(bh); | |
1572 | lock_buffer(bh); | |
1573 | ret = submit_bh(WRITE, bh); | |
1574 | } | |
1575 | } else { | |
1576 | ret = submit_bh(WRITE, bh); | |
1577 | } | |
a236aed1 CM |
1578 | if (ret) |
1579 | total_errors++; | |
f2984462 | 1580 | } |
a236aed1 CM |
1581 | if (total_errors > max_errors) { |
1582 | printk("btrfs: %d errors while writing supers\n", total_errors); | |
1583 | BUG(); | |
1584 | } | |
1585 | total_errors = 0; | |
f2984462 CM |
1586 | |
1587 | list_for_each(cur, head) { | |
1588 | dev = list_entry(cur, struct btrfs_device, dev_list); | |
dfe25020 CM |
1589 | if (!dev->bdev) |
1590 | continue; | |
1591 | if (!dev->in_fs_metadata) | |
1592 | continue; | |
1593 | ||
f2984462 CM |
1594 | BUG_ON(!dev->pending_io); |
1595 | bh = dev->pending_io; | |
1596 | wait_on_buffer(bh); | |
1597 | if (!buffer_uptodate(dev->pending_io)) { | |
1598 | if (do_barriers && dev->barriers) { | |
1599 | printk("btrfs: disabling barriers on dev %s\n", | |
1600 | dev->name); | |
1601 | set_buffer_uptodate(bh); | |
1602 | get_bh(bh); | |
1603 | lock_buffer(bh); | |
1604 | dev->barriers = 0; | |
1605 | ret = submit_bh(WRITE, bh); | |
1606 | BUG_ON(ret); | |
1607 | wait_on_buffer(bh); | |
1259ab75 CM |
1608 | if (!buffer_uptodate(bh)) |
1609 | total_errors++; | |
f2984462 | 1610 | } else { |
a236aed1 | 1611 | total_errors++; |
f2984462 CM |
1612 | } |
1613 | ||
1614 | } | |
1615 | dev->pending_io = NULL; | |
1616 | brelse(bh); | |
1617 | } | |
a236aed1 CM |
1618 | if (total_errors > max_errors) { |
1619 | printk("btrfs: %d errors while writing supers\n", total_errors); | |
1620 | BUG(); | |
1621 | } | |
f2984462 CM |
1622 | return 0; |
1623 | } | |
1624 | ||
e089f05c | 1625 | int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root |
79154b1b | 1626 | *root) |
eb60ceac | 1627 | { |
e66f709b | 1628 | int ret; |
5f39d397 | 1629 | |
f2984462 | 1630 | ret = write_all_supers(root); |
5f39d397 | 1631 | return ret; |
cfaa7295 CM |
1632 | } |
1633 | ||
5eda7b5e | 1634 | int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) |
2619ba1f CM |
1635 | { |
1636 | radix_tree_delete(&fs_info->fs_roots_radix, | |
1637 | (unsigned long)root->root_key.objectid); | |
b99aa6cb CM |
1638 | if (root->in_sysfs) |
1639 | btrfs_sysfs_del_root(root); | |
2619ba1f CM |
1640 | if (root->inode) |
1641 | iput(root->inode); | |
1642 | if (root->node) | |
5f39d397 | 1643 | free_extent_buffer(root->node); |
2619ba1f | 1644 | if (root->commit_root) |
5f39d397 | 1645 | free_extent_buffer(root->commit_root); |
58176a96 JB |
1646 | if (root->name) |
1647 | kfree(root->name); | |
2619ba1f CM |
1648 | kfree(root); |
1649 | return 0; | |
1650 | } | |
1651 | ||
35b7e476 | 1652 | static int del_fs_roots(struct btrfs_fs_info *fs_info) |
0f7d52f4 CM |
1653 | { |
1654 | int ret; | |
1655 | struct btrfs_root *gang[8]; | |
1656 | int i; | |
1657 | ||
1658 | while(1) { | |
1659 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, | |
1660 | (void **)gang, 0, | |
1661 | ARRAY_SIZE(gang)); | |
1662 | if (!ret) | |
1663 | break; | |
2619ba1f | 1664 | for (i = 0; i < ret; i++) |
5eda7b5e | 1665 | btrfs_free_fs_root(fs_info, gang[i]); |
0f7d52f4 CM |
1666 | } |
1667 | return 0; | |
1668 | } | |
b4100d64 | 1669 | |
e20d96d6 | 1670 | int close_ctree(struct btrfs_root *root) |
cfaa7295 | 1671 | { |
3768f368 | 1672 | int ret; |
e089f05c | 1673 | struct btrfs_trans_handle *trans; |
0f7d52f4 | 1674 | struct btrfs_fs_info *fs_info = root->fs_info; |
e089f05c | 1675 | |
facda1e7 | 1676 | fs_info->closing = 1; |
a2135011 CM |
1677 | smp_mb(); |
1678 | ||
a74a4b97 CM |
1679 | kthread_stop(root->fs_info->transaction_kthread); |
1680 | kthread_stop(root->fs_info->cleaner_kthread); | |
1681 | ||
a74a4b97 | 1682 | btrfs_clean_old_snapshots(root); |
79154b1b | 1683 | trans = btrfs_start_transaction(root, 1); |
54aa1f4d | 1684 | ret = btrfs_commit_transaction(trans, root); |
79154b1b CM |
1685 | /* run commit again to drop the original snapshot */ |
1686 | trans = btrfs_start_transaction(root, 1); | |
1687 | btrfs_commit_transaction(trans, root); | |
1688 | ret = btrfs_write_and_wait_transaction(NULL, root); | |
3768f368 | 1689 | BUG_ON(ret); |
d6bfde87 | 1690 | |
79154b1b | 1691 | write_ctree_super(NULL, root); |
0f7d52f4 | 1692 | |
b0c68f8b CM |
1693 | if (fs_info->delalloc_bytes) { |
1694 | printk("btrfs: at unmount delalloc count %Lu\n", | |
1695 | fs_info->delalloc_bytes); | |
1696 | } | |
0f7d52f4 | 1697 | if (fs_info->extent_root->node) |
5f39d397 | 1698 | free_extent_buffer(fs_info->extent_root->node); |
f510cfec | 1699 | |
0f7d52f4 | 1700 | if (fs_info->tree_root->node) |
5f39d397 | 1701 | free_extent_buffer(fs_info->tree_root->node); |
f510cfec | 1702 | |
0b86a832 CM |
1703 | if (root->fs_info->chunk_root->node); |
1704 | free_extent_buffer(root->fs_info->chunk_root->node); | |
1705 | ||
1706 | if (root->fs_info->dev_root->node); | |
1707 | free_extent_buffer(root->fs_info->dev_root->node); | |
1708 | ||
9078a3e1 | 1709 | btrfs_free_block_groups(root->fs_info); |
0f7d52f4 | 1710 | del_fs_roots(fs_info); |
d10c5f31 CM |
1711 | |
1712 | filemap_write_and_wait(fs_info->btree_inode->i_mapping); | |
1713 | ||
db94535d | 1714 | truncate_inode_pages(fs_info->btree_inode->i_mapping, 0); |
9ad6b7bc | 1715 | |
247e743c | 1716 | btrfs_stop_workers(&fs_info->fixup_workers); |
8b712842 CM |
1717 | btrfs_stop_workers(&fs_info->workers); |
1718 | btrfs_stop_workers(&fs_info->endio_workers); | |
e6dcd2dc | 1719 | btrfs_stop_workers(&fs_info->endio_write_workers); |
1cc127b5 | 1720 | btrfs_stop_workers(&fs_info->submit_workers); |
d6bfde87 | 1721 | |
db94535d | 1722 | iput(fs_info->btree_inode); |
19c00ddc CM |
1723 | #if 0 |
1724 | while(!list_empty(&fs_info->hashers)) { | |
1725 | struct btrfs_hasher *hasher; | |
1726 | hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher, | |
1727 | hashers); | |
1728 | list_del(&hasher->hashers); | |
1729 | crypto_free_hash(&fs_info->hash_tfm); | |
1730 | kfree(hasher); | |
1731 | } | |
1732 | #endif | |
dfe25020 | 1733 | btrfs_close_devices(fs_info->fs_devices); |
0b86a832 | 1734 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
b248a415 | 1735 | |
51ebc0d3 | 1736 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
04160088 | 1737 | bdi_destroy(&fs_info->bdi); |
b248a415 | 1738 | #endif |
0b86a832 | 1739 | |
0f7d52f4 | 1740 | kfree(fs_info->extent_root); |
0f7d52f4 | 1741 | kfree(fs_info->tree_root); |
0b86a832 CM |
1742 | kfree(fs_info->chunk_root); |
1743 | kfree(fs_info->dev_root); | |
eb60ceac CM |
1744 | return 0; |
1745 | } | |
1746 | ||
1259ab75 | 1747 | int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) |
5f39d397 | 1748 | { |
1259ab75 | 1749 | int ret; |
810191ff | 1750 | struct inode *btree_inode = buf->first_page->mapping->host; |
1259ab75 CM |
1751 | |
1752 | ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf); | |
1753 | if (!ret) | |
1754 | return ret; | |
1755 | ||
1756 | ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, | |
1757 | parent_transid); | |
1758 | return !ret; | |
5f39d397 CM |
1759 | } |
1760 | ||
1761 | int btrfs_set_buffer_uptodate(struct extent_buffer *buf) | |
ccd467d6 | 1762 | { |
810191ff | 1763 | struct inode *btree_inode = buf->first_page->mapping->host; |
d1310b2e | 1764 | return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, |
5f39d397 CM |
1765 | buf); |
1766 | } | |
6702ed49 | 1767 | |
5f39d397 CM |
1768 | void btrfs_mark_buffer_dirty(struct extent_buffer *buf) |
1769 | { | |
810191ff | 1770 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
5f39d397 CM |
1771 | u64 transid = btrfs_header_generation(buf); |
1772 | struct inode *btree_inode = root->fs_info->btree_inode; | |
6702ed49 | 1773 | |
925baedd | 1774 | WARN_ON(!btrfs_tree_locked(buf)); |
ccd467d6 CM |
1775 | if (transid != root->fs_info->generation) { |
1776 | printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n", | |
db94535d | 1777 | (unsigned long long)buf->start, |
ccd467d6 CM |
1778 | transid, root->fs_info->generation); |
1779 | WARN_ON(1); | |
1780 | } | |
d1310b2e | 1781 | set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf); |
eb60ceac CM |
1782 | } |
1783 | ||
d3c2fdcf | 1784 | void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) |
35b7e476 | 1785 | { |
188de649 CM |
1786 | /* |
1787 | * looks as though older kernels can get into trouble with | |
1788 | * this code, they end up stuck in balance_dirty_pages forever | |
1789 | */ | |
d6bfde87 CM |
1790 | struct extent_io_tree *tree; |
1791 | u64 num_dirty; | |
1792 | u64 start = 0; | |
1793 | unsigned long thresh = 16 * 1024 * 1024; | |
1794 | tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; | |
1795 | ||
1796 | if (current_is_pdflush()) | |
1797 | return; | |
1798 | ||
1799 | num_dirty = count_range_bits(tree, &start, (u64)-1, | |
1800 | thresh, EXTENT_DIRTY); | |
1801 | if (num_dirty > thresh) { | |
1802 | balance_dirty_pages_ratelimited_nr( | |
d7fc640e | 1803 | root->fs_info->btree_inode->i_mapping, 1); |
d6bfde87 | 1804 | } |
188de649 | 1805 | return; |
35b7e476 | 1806 | } |
6b80053d | 1807 | |
ca7a79ad | 1808 | int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) |
6b80053d | 1809 | { |
810191ff | 1810 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
ce9adaa5 | 1811 | int ret; |
ca7a79ad | 1812 | ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
ce9adaa5 CM |
1813 | if (ret == 0) { |
1814 | buf->flags |= EXTENT_UPTODATE; | |
1815 | } | |
1816 | return ret; | |
6b80053d | 1817 | } |
0da5468f | 1818 | |
d1310b2e | 1819 | static struct extent_io_ops btree_extent_io_ops = { |
0da5468f | 1820 | .writepage_io_hook = btree_writepage_io_hook, |
ce9adaa5 | 1821 | .readpage_end_io_hook = btree_readpage_end_io_hook, |
0b86a832 | 1822 | .submit_bio_hook = btree_submit_bio_hook, |
239b14b3 CM |
1823 | /* note we're sharing with inode.c for the merge bio hook */ |
1824 | .merge_bio_hook = btrfs_merge_bio_hook, | |
0da5468f | 1825 | }; |