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ccd979bd MF |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * Copyright (C) 2002, 2004 Oracle. All rights reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public | |
17 | * License along with this program; if not, write to the | |
18 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | * Boston, MA 021110-1307, USA. | |
20 | */ | |
21 | ||
22 | #include <linux/fs.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/highmem.h> | |
25 | #include <linux/pagemap.h> | |
26 | #include <asm/byteorder.h> | |
9517bac6 | 27 | #include <linux/swap.h> |
6af67d82 | 28 | #include <linux/pipe_fs_i.h> |
628a24f5 | 29 | #include <linux/mpage.h> |
a90714c1 | 30 | #include <linux/quotaops.h> |
ccd979bd MF |
31 | |
32 | #define MLOG_MASK_PREFIX ML_FILE_IO | |
33 | #include <cluster/masklog.h> | |
34 | ||
35 | #include "ocfs2.h" | |
36 | ||
37 | #include "alloc.h" | |
38 | #include "aops.h" | |
39 | #include "dlmglue.h" | |
40 | #include "extent_map.h" | |
41 | #include "file.h" | |
42 | #include "inode.h" | |
43 | #include "journal.h" | |
9517bac6 | 44 | #include "suballoc.h" |
ccd979bd MF |
45 | #include "super.h" |
46 | #include "symlink.h" | |
293b2f70 | 47 | #include "refcounttree.h" |
ccd979bd MF |
48 | |
49 | #include "buffer_head_io.h" | |
50 | ||
51 | static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock, | |
52 | struct buffer_head *bh_result, int create) | |
53 | { | |
54 | int err = -EIO; | |
55 | int status; | |
56 | struct ocfs2_dinode *fe = NULL; | |
57 | struct buffer_head *bh = NULL; | |
58 | struct buffer_head *buffer_cache_bh = NULL; | |
59 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
60 | void *kaddr; | |
61 | ||
62 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, | |
63 | (unsigned long long)iblock, bh_result, create); | |
64 | ||
65 | BUG_ON(ocfs2_inode_is_fast_symlink(inode)); | |
66 | ||
67 | if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) { | |
68 | mlog(ML_ERROR, "block offset > PATH_MAX: %llu", | |
69 | (unsigned long long)iblock); | |
70 | goto bail; | |
71 | } | |
72 | ||
b657c95c | 73 | status = ocfs2_read_inode_block(inode, &bh); |
ccd979bd MF |
74 | if (status < 0) { |
75 | mlog_errno(status); | |
76 | goto bail; | |
77 | } | |
78 | fe = (struct ocfs2_dinode *) bh->b_data; | |
79 | ||
ccd979bd MF |
80 | if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, |
81 | le32_to_cpu(fe->i_clusters))) { | |
82 | mlog(ML_ERROR, "block offset is outside the allocated size: " | |
83 | "%llu\n", (unsigned long long)iblock); | |
84 | goto bail; | |
85 | } | |
86 | ||
87 | /* We don't use the page cache to create symlink data, so if | |
88 | * need be, copy it over from the buffer cache. */ | |
89 | if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { | |
90 | u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + | |
91 | iblock; | |
92 | buffer_cache_bh = sb_getblk(osb->sb, blkno); | |
93 | if (!buffer_cache_bh) { | |
94 | mlog(ML_ERROR, "couldn't getblock for symlink!\n"); | |
95 | goto bail; | |
96 | } | |
97 | ||
98 | /* we haven't locked out transactions, so a commit | |
99 | * could've happened. Since we've got a reference on | |
100 | * the bh, even if it commits while we're doing the | |
101 | * copy, the data is still good. */ | |
102 | if (buffer_jbd(buffer_cache_bh) | |
103 | && ocfs2_inode_is_new(inode)) { | |
104 | kaddr = kmap_atomic(bh_result->b_page, KM_USER0); | |
105 | if (!kaddr) { | |
106 | mlog(ML_ERROR, "couldn't kmap!\n"); | |
107 | goto bail; | |
108 | } | |
109 | memcpy(kaddr + (bh_result->b_size * iblock), | |
110 | buffer_cache_bh->b_data, | |
111 | bh_result->b_size); | |
112 | kunmap_atomic(kaddr, KM_USER0); | |
113 | set_buffer_uptodate(bh_result); | |
114 | } | |
115 | brelse(buffer_cache_bh); | |
116 | } | |
117 | ||
118 | map_bh(bh_result, inode->i_sb, | |
119 | le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); | |
120 | ||
121 | err = 0; | |
122 | ||
123 | bail: | |
a81cb88b | 124 | brelse(bh); |
ccd979bd MF |
125 | |
126 | mlog_exit(err); | |
127 | return err; | |
128 | } | |
129 | ||
6f70fa51 TM |
130 | int ocfs2_get_block(struct inode *inode, sector_t iblock, |
131 | struct buffer_head *bh_result, int create) | |
ccd979bd MF |
132 | { |
133 | int err = 0; | |
49cb8d2d | 134 | unsigned int ext_flags; |
628a24f5 MF |
135 | u64 max_blocks = bh_result->b_size >> inode->i_blkbits; |
136 | u64 p_blkno, count, past_eof; | |
25baf2da | 137 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
138 | |
139 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, | |
140 | (unsigned long long)iblock, bh_result, create); | |
141 | ||
142 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) | |
143 | mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", | |
144 | inode, inode->i_ino); | |
145 | ||
146 | if (S_ISLNK(inode->i_mode)) { | |
147 | /* this always does I/O for some reason. */ | |
148 | err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); | |
149 | goto bail; | |
150 | } | |
151 | ||
628a24f5 | 152 | err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count, |
49cb8d2d | 153 | &ext_flags); |
ccd979bd MF |
154 | if (err) { |
155 | mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " | |
b0697053 MF |
156 | "%llu, NULL)\n", err, inode, (unsigned long long)iblock, |
157 | (unsigned long long)p_blkno); | |
ccd979bd MF |
158 | goto bail; |
159 | } | |
160 | ||
628a24f5 MF |
161 | if (max_blocks < count) |
162 | count = max_blocks; | |
163 | ||
25baf2da MF |
164 | /* |
165 | * ocfs2 never allocates in this function - the only time we | |
166 | * need to use BH_New is when we're extending i_size on a file | |
167 | * system which doesn't support holes, in which case BH_New | |
168 | * allows block_prepare_write() to zero. | |
c0420ad2 CL |
169 | * |
170 | * If we see this on a sparse file system, then a truncate has | |
171 | * raced us and removed the cluster. In this case, we clear | |
172 | * the buffers dirty and uptodate bits and let the buffer code | |
173 | * ignore it as a hole. | |
25baf2da | 174 | */ |
c0420ad2 CL |
175 | if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) { |
176 | clear_buffer_dirty(bh_result); | |
177 | clear_buffer_uptodate(bh_result); | |
178 | goto bail; | |
179 | } | |
25baf2da | 180 | |
49cb8d2d MF |
181 | /* Treat the unwritten extent as a hole for zeroing purposes. */ |
182 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) | |
25baf2da MF |
183 | map_bh(bh_result, inode->i_sb, p_blkno); |
184 | ||
628a24f5 MF |
185 | bh_result->b_size = count << inode->i_blkbits; |
186 | ||
25baf2da MF |
187 | if (!ocfs2_sparse_alloc(osb)) { |
188 | if (p_blkno == 0) { | |
189 | err = -EIO; | |
190 | mlog(ML_ERROR, | |
191 | "iblock = %llu p_blkno = %llu blkno=(%llu)\n", | |
192 | (unsigned long long)iblock, | |
193 | (unsigned long long)p_blkno, | |
194 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
195 | mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); | |
196 | dump_stack(); | |
1f4cea37 | 197 | goto bail; |
25baf2da | 198 | } |
ccd979bd | 199 | |
25baf2da MF |
200 | past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
201 | mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino, | |
202 | (unsigned long long)past_eof); | |
ccd979bd | 203 | |
25baf2da MF |
204 | if (create && (iblock >= past_eof)) |
205 | set_buffer_new(bh_result); | |
206 | } | |
ccd979bd MF |
207 | |
208 | bail: | |
209 | if (err < 0) | |
210 | err = -EIO; | |
211 | ||
212 | mlog_exit(err); | |
213 | return err; | |
214 | } | |
215 | ||
1afc32b9 MF |
216 | int ocfs2_read_inline_data(struct inode *inode, struct page *page, |
217 | struct buffer_head *di_bh) | |
6798d35a MF |
218 | { |
219 | void *kaddr; | |
d2849fb2 | 220 | loff_t size; |
6798d35a MF |
221 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
222 | ||
223 | if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) { | |
224 | ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag", | |
225 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
226 | return -EROFS; | |
227 | } | |
228 | ||
229 | size = i_size_read(inode); | |
230 | ||
231 | if (size > PAGE_CACHE_SIZE || | |
d9ae49d6 | 232 | size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) { |
6798d35a | 233 | ocfs2_error(inode->i_sb, |
d2849fb2 JK |
234 | "Inode %llu has with inline data has bad size: %Lu", |
235 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
236 | (unsigned long long)size); | |
6798d35a MF |
237 | return -EROFS; |
238 | } | |
239 | ||
240 | kaddr = kmap_atomic(page, KM_USER0); | |
241 | if (size) | |
242 | memcpy(kaddr, di->id2.i_data.id_data, size); | |
243 | /* Clear the remaining part of the page */ | |
244 | memset(kaddr + size, 0, PAGE_CACHE_SIZE - size); | |
245 | flush_dcache_page(page); | |
246 | kunmap_atomic(kaddr, KM_USER0); | |
247 | ||
248 | SetPageUptodate(page); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | static int ocfs2_readpage_inline(struct inode *inode, struct page *page) | |
254 | { | |
255 | int ret; | |
256 | struct buffer_head *di_bh = NULL; | |
6798d35a MF |
257 | |
258 | BUG_ON(!PageLocked(page)); | |
86c838b0 | 259 | BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)); |
6798d35a | 260 | |
b657c95c | 261 | ret = ocfs2_read_inode_block(inode, &di_bh); |
6798d35a MF |
262 | if (ret) { |
263 | mlog_errno(ret); | |
264 | goto out; | |
265 | } | |
266 | ||
267 | ret = ocfs2_read_inline_data(inode, page, di_bh); | |
268 | out: | |
269 | unlock_page(page); | |
270 | ||
271 | brelse(di_bh); | |
272 | return ret; | |
273 | } | |
274 | ||
ccd979bd MF |
275 | static int ocfs2_readpage(struct file *file, struct page *page) |
276 | { | |
277 | struct inode *inode = page->mapping->host; | |
6798d35a | 278 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
ccd979bd MF |
279 | loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT; |
280 | int ret, unlock = 1; | |
281 | ||
282 | mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0)); | |
283 | ||
e63aecb6 | 284 | ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page); |
ccd979bd MF |
285 | if (ret != 0) { |
286 | if (ret == AOP_TRUNCATED_PAGE) | |
287 | unlock = 0; | |
288 | mlog_errno(ret); | |
289 | goto out; | |
290 | } | |
291 | ||
6798d35a | 292 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { |
e9dfc0b2 | 293 | ret = AOP_TRUNCATED_PAGE; |
e63aecb6 | 294 | goto out_inode_unlock; |
e9dfc0b2 | 295 | } |
ccd979bd MF |
296 | |
297 | /* | |
298 | * i_size might have just been updated as we grabed the meta lock. We | |
299 | * might now be discovering a truncate that hit on another node. | |
300 | * block_read_full_page->get_block freaks out if it is asked to read | |
301 | * beyond the end of a file, so we check here. Callers | |
54cb8821 | 302 | * (generic_file_read, vm_ops->fault) are clever enough to check i_size |
ccd979bd MF |
303 | * and notice that the page they just read isn't needed. |
304 | * | |
305 | * XXX sys_readahead() seems to get that wrong? | |
306 | */ | |
307 | if (start >= i_size_read(inode)) { | |
eebd2aa3 | 308 | zero_user(page, 0, PAGE_SIZE); |
ccd979bd MF |
309 | SetPageUptodate(page); |
310 | ret = 0; | |
311 | goto out_alloc; | |
312 | } | |
313 | ||
6798d35a MF |
314 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
315 | ret = ocfs2_readpage_inline(inode, page); | |
316 | else | |
317 | ret = block_read_full_page(page, ocfs2_get_block); | |
ccd979bd MF |
318 | unlock = 0; |
319 | ||
ccd979bd MF |
320 | out_alloc: |
321 | up_read(&OCFS2_I(inode)->ip_alloc_sem); | |
e63aecb6 MF |
322 | out_inode_unlock: |
323 | ocfs2_inode_unlock(inode, 0); | |
ccd979bd MF |
324 | out: |
325 | if (unlock) | |
326 | unlock_page(page); | |
327 | mlog_exit(ret); | |
328 | return ret; | |
329 | } | |
330 | ||
628a24f5 MF |
331 | /* |
332 | * This is used only for read-ahead. Failures or difficult to handle | |
333 | * situations are safe to ignore. | |
334 | * | |
335 | * Right now, we don't bother with BH_Boundary - in-inode extent lists | |
336 | * are quite large (243 extents on 4k blocks), so most inodes don't | |
337 | * grow out to a tree. If need be, detecting boundary extents could | |
338 | * trivially be added in a future version of ocfs2_get_block(). | |
339 | */ | |
340 | static int ocfs2_readpages(struct file *filp, struct address_space *mapping, | |
341 | struct list_head *pages, unsigned nr_pages) | |
342 | { | |
343 | int ret, err = -EIO; | |
344 | struct inode *inode = mapping->host; | |
345 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
346 | loff_t start; | |
347 | struct page *last; | |
348 | ||
349 | /* | |
350 | * Use the nonblocking flag for the dlm code to avoid page | |
351 | * lock inversion, but don't bother with retrying. | |
352 | */ | |
353 | ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK); | |
354 | if (ret) | |
355 | return err; | |
356 | ||
357 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { | |
358 | ocfs2_inode_unlock(inode, 0); | |
359 | return err; | |
360 | } | |
361 | ||
362 | /* | |
363 | * Don't bother with inline-data. There isn't anything | |
364 | * to read-ahead in that case anyway... | |
365 | */ | |
366 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
367 | goto out_unlock; | |
368 | ||
369 | /* | |
370 | * Check whether a remote node truncated this file - we just | |
371 | * drop out in that case as it's not worth handling here. | |
372 | */ | |
373 | last = list_entry(pages->prev, struct page, lru); | |
374 | start = (loff_t)last->index << PAGE_CACHE_SHIFT; | |
375 | if (start >= i_size_read(inode)) | |
376 | goto out_unlock; | |
377 | ||
378 | err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block); | |
379 | ||
380 | out_unlock: | |
381 | up_read(&oi->ip_alloc_sem); | |
382 | ocfs2_inode_unlock(inode, 0); | |
383 | ||
384 | return err; | |
385 | } | |
386 | ||
ccd979bd MF |
387 | /* Note: Because we don't support holes, our allocation has |
388 | * already happened (allocation writes zeros to the file data) | |
389 | * so we don't have to worry about ordered writes in | |
390 | * ocfs2_writepage. | |
391 | * | |
392 | * ->writepage is called during the process of invalidating the page cache | |
393 | * during blocked lock processing. It can't block on any cluster locks | |
394 | * to during block mapping. It's relying on the fact that the block | |
395 | * mapping can't have disappeared under the dirty pages that it is | |
396 | * being asked to write back. | |
397 | */ | |
398 | static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) | |
399 | { | |
400 | int ret; | |
401 | ||
402 | mlog_entry("(0x%p)\n", page); | |
403 | ||
404 | ret = block_write_full_page(page, ocfs2_get_block, wbc); | |
405 | ||
406 | mlog_exit(ret); | |
407 | ||
408 | return ret; | |
409 | } | |
410 | ||
5069120b MF |
411 | /* |
412 | * This is called from ocfs2_write_zero_page() which has handled it's | |
413 | * own cluster locking and has ensured allocation exists for those | |
414 | * blocks to be written. | |
415 | */ | |
53013cba MF |
416 | int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page, |
417 | unsigned from, unsigned to) | |
418 | { | |
419 | int ret; | |
420 | ||
53013cba MF |
421 | ret = block_prepare_write(page, from, to, ocfs2_get_block); |
422 | ||
53013cba MF |
423 | return ret; |
424 | } | |
425 | ||
ccd979bd MF |
426 | /* Taken from ext3. We don't necessarily need the full blown |
427 | * functionality yet, but IMHO it's better to cut and paste the whole | |
428 | * thing so we can avoid introducing our own bugs (and easily pick up | |
429 | * their fixes when they happen) --Mark */ | |
60b11392 MF |
430 | int walk_page_buffers( handle_t *handle, |
431 | struct buffer_head *head, | |
432 | unsigned from, | |
433 | unsigned to, | |
434 | int *partial, | |
435 | int (*fn)( handle_t *handle, | |
436 | struct buffer_head *bh)) | |
ccd979bd MF |
437 | { |
438 | struct buffer_head *bh; | |
439 | unsigned block_start, block_end; | |
440 | unsigned blocksize = head->b_size; | |
441 | int err, ret = 0; | |
442 | struct buffer_head *next; | |
443 | ||
444 | for ( bh = head, block_start = 0; | |
445 | ret == 0 && (bh != head || !block_start); | |
446 | block_start = block_end, bh = next) | |
447 | { | |
448 | next = bh->b_this_page; | |
449 | block_end = block_start + blocksize; | |
450 | if (block_end <= from || block_start >= to) { | |
451 | if (partial && !buffer_uptodate(bh)) | |
452 | *partial = 1; | |
453 | continue; | |
454 | } | |
455 | err = (*fn)(handle, bh); | |
456 | if (!ret) | |
457 | ret = err; | |
458 | } | |
459 | return ret; | |
460 | } | |
461 | ||
1fabe148 | 462 | handle_t *ocfs2_start_walk_page_trans(struct inode *inode, |
ccd979bd MF |
463 | struct page *page, |
464 | unsigned from, | |
465 | unsigned to) | |
466 | { | |
467 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
58dadcdb | 468 | handle_t *handle; |
ccd979bd MF |
469 | int ret = 0; |
470 | ||
65eff9cc | 471 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
58dadcdb | 472 | if (IS_ERR(handle)) { |
ccd979bd MF |
473 | ret = -ENOMEM; |
474 | mlog_errno(ret); | |
475 | goto out; | |
476 | } | |
477 | ||
478 | if (ocfs2_should_order_data(inode)) { | |
2b4e30fb | 479 | ret = ocfs2_jbd2_file_inode(handle, inode); |
2b4e30fb | 480 | if (ret < 0) |
ccd979bd MF |
481 | mlog_errno(ret); |
482 | } | |
483 | out: | |
484 | if (ret) { | |
58dadcdb | 485 | if (!IS_ERR(handle)) |
02dc1af4 | 486 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
487 | handle = ERR_PTR(ret); |
488 | } | |
489 | return handle; | |
490 | } | |
491 | ||
ccd979bd MF |
492 | static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) |
493 | { | |
494 | sector_t status; | |
495 | u64 p_blkno = 0; | |
496 | int err = 0; | |
497 | struct inode *inode = mapping->host; | |
498 | ||
499 | mlog_entry("(block = %llu)\n", (unsigned long long)block); | |
500 | ||
501 | /* We don't need to lock journal system files, since they aren't | |
502 | * accessed concurrently from multiple nodes. | |
503 | */ | |
504 | if (!INODE_JOURNAL(inode)) { | |
e63aecb6 | 505 | err = ocfs2_inode_lock(inode, NULL, 0); |
ccd979bd MF |
506 | if (err) { |
507 | if (err != -ENOENT) | |
508 | mlog_errno(err); | |
509 | goto bail; | |
510 | } | |
511 | down_read(&OCFS2_I(inode)->ip_alloc_sem); | |
512 | } | |
513 | ||
6798d35a MF |
514 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) |
515 | err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, | |
516 | NULL); | |
ccd979bd MF |
517 | |
518 | if (!INODE_JOURNAL(inode)) { | |
519 | up_read(&OCFS2_I(inode)->ip_alloc_sem); | |
e63aecb6 | 520 | ocfs2_inode_unlock(inode, 0); |
ccd979bd MF |
521 | } |
522 | ||
523 | if (err) { | |
524 | mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", | |
525 | (unsigned long long)block); | |
526 | mlog_errno(err); | |
527 | goto bail; | |
528 | } | |
529 | ||
ccd979bd MF |
530 | bail: |
531 | status = err ? 0 : p_blkno; | |
532 | ||
533 | mlog_exit((int)status); | |
534 | ||
535 | return status; | |
536 | } | |
537 | ||
538 | /* | |
539 | * TODO: Make this into a generic get_blocks function. | |
540 | * | |
541 | * From do_direct_io in direct-io.c: | |
542 | * "So what we do is to permit the ->get_blocks function to populate | |
543 | * bh.b_size with the size of IO which is permitted at this offset and | |
544 | * this i_blkbits." | |
545 | * | |
546 | * This function is called directly from get_more_blocks in direct-io.c. | |
547 | * | |
548 | * called like this: dio->get_blocks(dio->inode, fs_startblk, | |
549 | * fs_count, map_bh, dio->rw == WRITE); | |
550 | */ | |
551 | static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock, | |
ccd979bd MF |
552 | struct buffer_head *bh_result, int create) |
553 | { | |
554 | int ret; | |
4f902c37 | 555 | u64 p_blkno, inode_blocks, contig_blocks; |
49cb8d2d | 556 | unsigned int ext_flags; |
184d7d20 | 557 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
1d8fa7a2 | 558 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
ccd979bd | 559 | |
ccd979bd MF |
560 | /* This function won't even be called if the request isn't all |
561 | * nicely aligned and of the right size, so there's no need | |
562 | * for us to check any of that. */ | |
563 | ||
25baf2da | 564 | inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
564f8a32 MF |
565 | |
566 | /* | |
567 | * Any write past EOF is not allowed because we'd be extending. | |
568 | */ | |
569 | if (create && (iblock + max_blocks) > inode_blocks) { | |
ccd979bd MF |
570 | ret = -EIO; |
571 | goto bail; | |
572 | } | |
ccd979bd MF |
573 | |
574 | /* This figures out the size of the next contiguous block, and | |
575 | * our logical offset */ | |
363041a5 | 576 | ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, |
49cb8d2d | 577 | &contig_blocks, &ext_flags); |
ccd979bd MF |
578 | if (ret) { |
579 | mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", | |
580 | (unsigned long long)iblock); | |
581 | ret = -EIO; | |
582 | goto bail; | |
583 | } | |
584 | ||
0e116227 | 585 | if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)) && !p_blkno && create) { |
25baf2da MF |
586 | ocfs2_error(inode->i_sb, |
587 | "Inode %llu has a hole at block %llu\n", | |
588 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
589 | (unsigned long long)iblock); | |
590 | ret = -EROFS; | |
591 | goto bail; | |
592 | } | |
593 | ||
293b2f70 TM |
594 | /* We should already CoW the refcounted extent. */ |
595 | BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED); | |
25baf2da MF |
596 | /* |
597 | * get_more_blocks() expects us to describe a hole by clearing | |
598 | * the mapped bit on bh_result(). | |
49cb8d2d MF |
599 | * |
600 | * Consider an unwritten extent as a hole. | |
25baf2da | 601 | */ |
49cb8d2d | 602 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
25baf2da MF |
603 | map_bh(bh_result, inode->i_sb, p_blkno); |
604 | else { | |
605 | /* | |
606 | * ocfs2_prepare_inode_for_write() should have caught | |
607 | * the case where we'd be filling a hole and triggered | |
608 | * a buffered write instead. | |
609 | */ | |
610 | if (create) { | |
611 | ret = -EIO; | |
612 | mlog_errno(ret); | |
613 | goto bail; | |
614 | } | |
615 | ||
616 | clear_buffer_mapped(bh_result); | |
617 | } | |
ccd979bd MF |
618 | |
619 | /* make sure we don't map more than max_blocks blocks here as | |
620 | that's all the kernel will handle at this point. */ | |
621 | if (max_blocks < contig_blocks) | |
622 | contig_blocks = max_blocks; | |
623 | bh_result->b_size = contig_blocks << blocksize_bits; | |
624 | bail: | |
625 | return ret; | |
626 | } | |
627 | ||
628 | /* | |
629 | * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're | |
630 | * particularly interested in the aio/dio case. Like the core uses | |
631 | * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from | |
632 | * truncation on another. | |
633 | */ | |
634 | static void ocfs2_dio_end_io(struct kiocb *iocb, | |
635 | loff_t offset, | |
636 | ssize_t bytes, | |
637 | void *private) | |
638 | { | |
d28c9174 | 639 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
7cdfc3a1 | 640 | int level; |
ccd979bd MF |
641 | |
642 | /* this io's submitter should not have unlocked this before we could */ | |
643 | BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); | |
7cdfc3a1 | 644 | |
ccd979bd | 645 | ocfs2_iocb_clear_rw_locked(iocb); |
7cdfc3a1 MF |
646 | |
647 | level = ocfs2_iocb_rw_locked_level(iocb); | |
648 | if (!level) | |
649 | up_read(&inode->i_alloc_sem); | |
650 | ocfs2_rw_unlock(inode, level); | |
ccd979bd MF |
651 | } |
652 | ||
03f981cf JB |
653 | /* |
654 | * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen | |
655 | * from ext3. PageChecked() bits have been removed as OCFS2 does not | |
656 | * do journalled data. | |
657 | */ | |
658 | static void ocfs2_invalidatepage(struct page *page, unsigned long offset) | |
659 | { | |
660 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; | |
661 | ||
2b4e30fb | 662 | jbd2_journal_invalidatepage(journal, page, offset); |
03f981cf JB |
663 | } |
664 | ||
665 | static int ocfs2_releasepage(struct page *page, gfp_t wait) | |
666 | { | |
667 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; | |
668 | ||
669 | if (!page_has_buffers(page)) | |
670 | return 0; | |
2b4e30fb | 671 | return jbd2_journal_try_to_free_buffers(journal, page, wait); |
03f981cf JB |
672 | } |
673 | ||
ccd979bd MF |
674 | static ssize_t ocfs2_direct_IO(int rw, |
675 | struct kiocb *iocb, | |
676 | const struct iovec *iov, | |
677 | loff_t offset, | |
678 | unsigned long nr_segs) | |
679 | { | |
680 | struct file *file = iocb->ki_filp; | |
d28c9174 | 681 | struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; |
ccd979bd MF |
682 | int ret; |
683 | ||
684 | mlog_entry_void(); | |
53013cba | 685 | |
6798d35a MF |
686 | /* |
687 | * Fallback to buffered I/O if we see an inode without | |
688 | * extents. | |
689 | */ | |
690 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
691 | return 0; | |
692 | ||
b80474b4 TM |
693 | /* Fallback to buffered I/O if we are appending. */ |
694 | if (i_size_read(inode) <= offset) | |
695 | return 0; | |
696 | ||
ccd979bd MF |
697 | ret = blockdev_direct_IO_no_locking(rw, iocb, inode, |
698 | inode->i_sb->s_bdev, iov, offset, | |
699 | nr_segs, | |
700 | ocfs2_direct_IO_get_blocks, | |
701 | ocfs2_dio_end_io); | |
c934a92d | 702 | |
ccd979bd MF |
703 | mlog_exit(ret); |
704 | return ret; | |
705 | } | |
706 | ||
9517bac6 MF |
707 | static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, |
708 | u32 cpos, | |
709 | unsigned int *start, | |
710 | unsigned int *end) | |
711 | { | |
712 | unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE; | |
713 | ||
714 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) { | |
715 | unsigned int cpp; | |
716 | ||
717 | cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits); | |
718 | ||
719 | cluster_start = cpos % cpp; | |
720 | cluster_start = cluster_start << osb->s_clustersize_bits; | |
721 | ||
722 | cluster_end = cluster_start + osb->s_clustersize; | |
723 | } | |
724 | ||
725 | BUG_ON(cluster_start > PAGE_SIZE); | |
726 | BUG_ON(cluster_end > PAGE_SIZE); | |
727 | ||
728 | if (start) | |
729 | *start = cluster_start; | |
730 | if (end) | |
731 | *end = cluster_end; | |
732 | } | |
733 | ||
734 | /* | |
735 | * 'from' and 'to' are the region in the page to avoid zeroing. | |
736 | * | |
737 | * If pagesize > clustersize, this function will avoid zeroing outside | |
738 | * of the cluster boundary. | |
739 | * | |
740 | * from == to == 0 is code for "zero the entire cluster region" | |
741 | */ | |
742 | static void ocfs2_clear_page_regions(struct page *page, | |
743 | struct ocfs2_super *osb, u32 cpos, | |
744 | unsigned from, unsigned to) | |
745 | { | |
746 | void *kaddr; | |
747 | unsigned int cluster_start, cluster_end; | |
748 | ||
749 | ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); | |
750 | ||
751 | kaddr = kmap_atomic(page, KM_USER0); | |
752 | ||
753 | if (from || to) { | |
754 | if (from > cluster_start) | |
755 | memset(kaddr + cluster_start, 0, from - cluster_start); | |
756 | if (to < cluster_end) | |
757 | memset(kaddr + to, 0, cluster_end - to); | |
758 | } else { | |
759 | memset(kaddr + cluster_start, 0, cluster_end - cluster_start); | |
760 | } | |
761 | ||
762 | kunmap_atomic(kaddr, KM_USER0); | |
763 | } | |
764 | ||
4e9563fd MF |
765 | /* |
766 | * Nonsparse file systems fully allocate before we get to the write | |
767 | * code. This prevents ocfs2_write() from tagging the write as an | |
768 | * allocating one, which means ocfs2_map_page_blocks() might try to | |
769 | * read-in the blocks at the tail of our file. Avoid reading them by | |
770 | * testing i_size against each block offset. | |
771 | */ | |
772 | static int ocfs2_should_read_blk(struct inode *inode, struct page *page, | |
773 | unsigned int block_start) | |
774 | { | |
775 | u64 offset = page_offset(page) + block_start; | |
776 | ||
777 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) | |
778 | return 1; | |
779 | ||
780 | if (i_size_read(inode) > offset) | |
781 | return 1; | |
782 | ||
783 | return 0; | |
784 | } | |
785 | ||
9517bac6 MF |
786 | /* |
787 | * Some of this taken from block_prepare_write(). We already have our | |
788 | * mapping by now though, and the entire write will be allocating or | |
789 | * it won't, so not much need to use BH_New. | |
790 | * | |
791 | * This will also skip zeroing, which is handled externally. | |
792 | */ | |
60b11392 MF |
793 | int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, |
794 | struct inode *inode, unsigned int from, | |
795 | unsigned int to, int new) | |
9517bac6 MF |
796 | { |
797 | int ret = 0; | |
798 | struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; | |
799 | unsigned int block_end, block_start; | |
800 | unsigned int bsize = 1 << inode->i_blkbits; | |
801 | ||
802 | if (!page_has_buffers(page)) | |
803 | create_empty_buffers(page, bsize, 0); | |
804 | ||
805 | head = page_buffers(page); | |
806 | for (bh = head, block_start = 0; bh != head || !block_start; | |
807 | bh = bh->b_this_page, block_start += bsize) { | |
808 | block_end = block_start + bsize; | |
809 | ||
3a307ffc MF |
810 | clear_buffer_new(bh); |
811 | ||
9517bac6 MF |
812 | /* |
813 | * Ignore blocks outside of our i/o range - | |
814 | * they may belong to unallocated clusters. | |
815 | */ | |
60b11392 | 816 | if (block_start >= to || block_end <= from) { |
9517bac6 MF |
817 | if (PageUptodate(page)) |
818 | set_buffer_uptodate(bh); | |
819 | continue; | |
820 | } | |
821 | ||
822 | /* | |
823 | * For an allocating write with cluster size >= page | |
824 | * size, we always write the entire page. | |
825 | */ | |
3a307ffc MF |
826 | if (new) |
827 | set_buffer_new(bh); | |
9517bac6 MF |
828 | |
829 | if (!buffer_mapped(bh)) { | |
830 | map_bh(bh, inode->i_sb, *p_blkno); | |
831 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); | |
832 | } | |
833 | ||
834 | if (PageUptodate(page)) { | |
835 | if (!buffer_uptodate(bh)) | |
836 | set_buffer_uptodate(bh); | |
837 | } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && | |
bce99768 | 838 | !buffer_new(bh) && |
4e9563fd | 839 | ocfs2_should_read_blk(inode, page, block_start) && |
bce99768 | 840 | (block_start < from || block_end > to)) { |
9517bac6 MF |
841 | ll_rw_block(READ, 1, &bh); |
842 | *wait_bh++=bh; | |
843 | } | |
844 | ||
845 | *p_blkno = *p_blkno + 1; | |
846 | } | |
847 | ||
848 | /* | |
849 | * If we issued read requests - let them complete. | |
850 | */ | |
851 | while(wait_bh > wait) { | |
852 | wait_on_buffer(*--wait_bh); | |
853 | if (!buffer_uptodate(*wait_bh)) | |
854 | ret = -EIO; | |
855 | } | |
856 | ||
857 | if (ret == 0 || !new) | |
858 | return ret; | |
859 | ||
860 | /* | |
861 | * If we get -EIO above, zero out any newly allocated blocks | |
862 | * to avoid exposing stale data. | |
863 | */ | |
864 | bh = head; | |
865 | block_start = 0; | |
866 | do { | |
9517bac6 MF |
867 | block_end = block_start + bsize; |
868 | if (block_end <= from) | |
869 | goto next_bh; | |
870 | if (block_start >= to) | |
871 | break; | |
872 | ||
eebd2aa3 | 873 | zero_user(page, block_start, bh->b_size); |
9517bac6 MF |
874 | set_buffer_uptodate(bh); |
875 | mark_buffer_dirty(bh); | |
876 | ||
877 | next_bh: | |
878 | block_start = block_end; | |
879 | bh = bh->b_this_page; | |
880 | } while (bh != head); | |
881 | ||
882 | return ret; | |
883 | } | |
884 | ||
3a307ffc MF |
885 | #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE) |
886 | #define OCFS2_MAX_CTXT_PAGES 1 | |
887 | #else | |
888 | #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE) | |
889 | #endif | |
890 | ||
891 | #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE) | |
892 | ||
6af67d82 | 893 | /* |
3a307ffc | 894 | * Describe the state of a single cluster to be written to. |
6af67d82 | 895 | */ |
3a307ffc MF |
896 | struct ocfs2_write_cluster_desc { |
897 | u32 c_cpos; | |
898 | u32 c_phys; | |
899 | /* | |
900 | * Give this a unique field because c_phys eventually gets | |
901 | * filled. | |
902 | */ | |
903 | unsigned c_new; | |
b27b7cbc | 904 | unsigned c_unwritten; |
e7432675 | 905 | unsigned c_needs_zero; |
3a307ffc | 906 | }; |
6af67d82 | 907 | |
3a307ffc MF |
908 | struct ocfs2_write_ctxt { |
909 | /* Logical cluster position / len of write */ | |
910 | u32 w_cpos; | |
911 | u32 w_clen; | |
6af67d82 | 912 | |
e7432675 SM |
913 | /* First cluster allocated in a nonsparse extend */ |
914 | u32 w_first_new_cpos; | |
915 | ||
3a307ffc | 916 | struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE]; |
6af67d82 | 917 | |
3a307ffc MF |
918 | /* |
919 | * This is true if page_size > cluster_size. | |
920 | * | |
921 | * It triggers a set of special cases during write which might | |
922 | * have to deal with allocating writes to partial pages. | |
923 | */ | |
924 | unsigned int w_large_pages; | |
6af67d82 | 925 | |
3a307ffc MF |
926 | /* |
927 | * Pages involved in this write. | |
928 | * | |
929 | * w_target_page is the page being written to by the user. | |
930 | * | |
931 | * w_pages is an array of pages which always contains | |
932 | * w_target_page, and in the case of an allocating write with | |
933 | * page_size < cluster size, it will contain zero'd and mapped | |
934 | * pages adjacent to w_target_page which need to be written | |
935 | * out in so that future reads from that region will get | |
936 | * zero's. | |
937 | */ | |
938 | struct page *w_pages[OCFS2_MAX_CTXT_PAGES]; | |
939 | unsigned int w_num_pages; | |
940 | struct page *w_target_page; | |
eeb47d12 | 941 | |
3a307ffc MF |
942 | /* |
943 | * ocfs2_write_end() uses this to know what the real range to | |
944 | * write in the target should be. | |
945 | */ | |
946 | unsigned int w_target_from; | |
947 | unsigned int w_target_to; | |
948 | ||
949 | /* | |
950 | * We could use journal_current_handle() but this is cleaner, | |
951 | * IMHO -Mark | |
952 | */ | |
953 | handle_t *w_handle; | |
954 | ||
955 | struct buffer_head *w_di_bh; | |
b27b7cbc MF |
956 | |
957 | struct ocfs2_cached_dealloc_ctxt w_dealloc; | |
3a307ffc MF |
958 | }; |
959 | ||
1d410a6e | 960 | void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages) |
3a307ffc MF |
961 | { |
962 | int i; | |
963 | ||
1d410a6e MF |
964 | for(i = 0; i < num_pages; i++) { |
965 | if (pages[i]) { | |
966 | unlock_page(pages[i]); | |
967 | mark_page_accessed(pages[i]); | |
968 | page_cache_release(pages[i]); | |
969 | } | |
6af67d82 | 970 | } |
1d410a6e MF |
971 | } |
972 | ||
973 | static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc) | |
974 | { | |
975 | ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages); | |
6af67d82 | 976 | |
3a307ffc MF |
977 | brelse(wc->w_di_bh); |
978 | kfree(wc); | |
979 | } | |
980 | ||
981 | static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp, | |
982 | struct ocfs2_super *osb, loff_t pos, | |
607d44aa | 983 | unsigned len, struct buffer_head *di_bh) |
3a307ffc | 984 | { |
30b8548f | 985 | u32 cend; |
3a307ffc MF |
986 | struct ocfs2_write_ctxt *wc; |
987 | ||
988 | wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS); | |
989 | if (!wc) | |
990 | return -ENOMEM; | |
6af67d82 | 991 | |
3a307ffc | 992 | wc->w_cpos = pos >> osb->s_clustersize_bits; |
e7432675 | 993 | wc->w_first_new_cpos = UINT_MAX; |
30b8548f | 994 | cend = (pos + len - 1) >> osb->s_clustersize_bits; |
995 | wc->w_clen = cend - wc->w_cpos + 1; | |
607d44aa MF |
996 | get_bh(di_bh); |
997 | wc->w_di_bh = di_bh; | |
6af67d82 | 998 | |
3a307ffc MF |
999 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) |
1000 | wc->w_large_pages = 1; | |
1001 | else | |
1002 | wc->w_large_pages = 0; | |
1003 | ||
b27b7cbc MF |
1004 | ocfs2_init_dealloc_ctxt(&wc->w_dealloc); |
1005 | ||
3a307ffc | 1006 | *wcp = wc; |
6af67d82 | 1007 | |
3a307ffc | 1008 | return 0; |
6af67d82 MF |
1009 | } |
1010 | ||
9517bac6 | 1011 | /* |
3a307ffc MF |
1012 | * If a page has any new buffers, zero them out here, and mark them uptodate |
1013 | * and dirty so they'll be written out (in order to prevent uninitialised | |
1014 | * block data from leaking). And clear the new bit. | |
9517bac6 | 1015 | */ |
3a307ffc | 1016 | static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to) |
9517bac6 | 1017 | { |
3a307ffc MF |
1018 | unsigned int block_start, block_end; |
1019 | struct buffer_head *head, *bh; | |
9517bac6 | 1020 | |
3a307ffc MF |
1021 | BUG_ON(!PageLocked(page)); |
1022 | if (!page_has_buffers(page)) | |
1023 | return; | |
9517bac6 | 1024 | |
3a307ffc MF |
1025 | bh = head = page_buffers(page); |
1026 | block_start = 0; | |
1027 | do { | |
1028 | block_end = block_start + bh->b_size; | |
1029 | ||
1030 | if (buffer_new(bh)) { | |
1031 | if (block_end > from && block_start < to) { | |
1032 | if (!PageUptodate(page)) { | |
1033 | unsigned start, end; | |
3a307ffc MF |
1034 | |
1035 | start = max(from, block_start); | |
1036 | end = min(to, block_end); | |
1037 | ||
eebd2aa3 | 1038 | zero_user_segment(page, start, end); |
3a307ffc MF |
1039 | set_buffer_uptodate(bh); |
1040 | } | |
1041 | ||
1042 | clear_buffer_new(bh); | |
1043 | mark_buffer_dirty(bh); | |
1044 | } | |
1045 | } | |
9517bac6 | 1046 | |
3a307ffc MF |
1047 | block_start = block_end; |
1048 | bh = bh->b_this_page; | |
1049 | } while (bh != head); | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Only called when we have a failure during allocating write to write | |
1054 | * zero's to the newly allocated region. | |
1055 | */ | |
1056 | static void ocfs2_write_failure(struct inode *inode, | |
1057 | struct ocfs2_write_ctxt *wc, | |
1058 | loff_t user_pos, unsigned user_len) | |
1059 | { | |
1060 | int i; | |
5c26a7b7 MF |
1061 | unsigned from = user_pos & (PAGE_CACHE_SIZE - 1), |
1062 | to = user_pos + user_len; | |
3a307ffc MF |
1063 | struct page *tmppage; |
1064 | ||
5c26a7b7 | 1065 | ocfs2_zero_new_buffers(wc->w_target_page, from, to); |
9517bac6 | 1066 | |
3a307ffc MF |
1067 | for(i = 0; i < wc->w_num_pages; i++) { |
1068 | tmppage = wc->w_pages[i]; | |
9517bac6 | 1069 | |
961cecbe | 1070 | if (page_has_buffers(tmppage)) { |
53ef99ca | 1071 | if (ocfs2_should_order_data(inode)) |
2b4e30fb | 1072 | ocfs2_jbd2_file_inode(wc->w_handle, inode); |
961cecbe SM |
1073 | |
1074 | block_commit_write(tmppage, from, to); | |
1075 | } | |
9517bac6 | 1076 | } |
9517bac6 MF |
1077 | } |
1078 | ||
3a307ffc MF |
1079 | static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno, |
1080 | struct ocfs2_write_ctxt *wc, | |
1081 | struct page *page, u32 cpos, | |
1082 | loff_t user_pos, unsigned user_len, | |
1083 | int new) | |
9517bac6 | 1084 | { |
3a307ffc MF |
1085 | int ret; |
1086 | unsigned int map_from = 0, map_to = 0; | |
9517bac6 | 1087 | unsigned int cluster_start, cluster_end; |
3a307ffc | 1088 | unsigned int user_data_from = 0, user_data_to = 0; |
9517bac6 | 1089 | |
3a307ffc | 1090 | ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, |
9517bac6 MF |
1091 | &cluster_start, &cluster_end); |
1092 | ||
3a307ffc MF |
1093 | if (page == wc->w_target_page) { |
1094 | map_from = user_pos & (PAGE_CACHE_SIZE - 1); | |
1095 | map_to = map_from + user_len; | |
1096 | ||
1097 | if (new) | |
1098 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
1099 | cluster_start, cluster_end, | |
1100 | new); | |
1101 | else | |
1102 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
1103 | map_from, map_to, new); | |
1104 | if (ret) { | |
9517bac6 MF |
1105 | mlog_errno(ret); |
1106 | goto out; | |
1107 | } | |
1108 | ||
3a307ffc MF |
1109 | user_data_from = map_from; |
1110 | user_data_to = map_to; | |
9517bac6 | 1111 | if (new) { |
3a307ffc MF |
1112 | map_from = cluster_start; |
1113 | map_to = cluster_end; | |
9517bac6 MF |
1114 | } |
1115 | } else { | |
1116 | /* | |
1117 | * If we haven't allocated the new page yet, we | |
1118 | * shouldn't be writing it out without copying user | |
1119 | * data. This is likely a math error from the caller. | |
1120 | */ | |
1121 | BUG_ON(!new); | |
1122 | ||
3a307ffc MF |
1123 | map_from = cluster_start; |
1124 | map_to = cluster_end; | |
9517bac6 MF |
1125 | |
1126 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
3a307ffc | 1127 | cluster_start, cluster_end, new); |
9517bac6 MF |
1128 | if (ret) { |
1129 | mlog_errno(ret); | |
1130 | goto out; | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | /* | |
1135 | * Parts of newly allocated pages need to be zero'd. | |
1136 | * | |
1137 | * Above, we have also rewritten 'to' and 'from' - as far as | |
1138 | * the rest of the function is concerned, the entire cluster | |
1139 | * range inside of a page needs to be written. | |
1140 | * | |
1141 | * We can skip this if the page is up to date - it's already | |
1142 | * been zero'd from being read in as a hole. | |
1143 | */ | |
1144 | if (new && !PageUptodate(page)) | |
1145 | ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), | |
3a307ffc | 1146 | cpos, user_data_from, user_data_to); |
9517bac6 MF |
1147 | |
1148 | flush_dcache_page(page); | |
1149 | ||
9517bac6 | 1150 | out: |
3a307ffc | 1151 | return ret; |
9517bac6 MF |
1152 | } |
1153 | ||
1154 | /* | |
3a307ffc | 1155 | * This function will only grab one clusters worth of pages. |
9517bac6 | 1156 | */ |
3a307ffc MF |
1157 | static int ocfs2_grab_pages_for_write(struct address_space *mapping, |
1158 | struct ocfs2_write_ctxt *wc, | |
7307de80 MF |
1159 | u32 cpos, loff_t user_pos, int new, |
1160 | struct page *mmap_page) | |
9517bac6 | 1161 | { |
3a307ffc MF |
1162 | int ret = 0, i; |
1163 | unsigned long start, target_index, index; | |
9517bac6 | 1164 | struct inode *inode = mapping->host; |
9517bac6 | 1165 | |
3a307ffc | 1166 | target_index = user_pos >> PAGE_CACHE_SHIFT; |
9517bac6 MF |
1167 | |
1168 | /* | |
1169 | * Figure out how many pages we'll be manipulating here. For | |
60b11392 MF |
1170 | * non allocating write, we just change the one |
1171 | * page. Otherwise, we'll need a whole clusters worth. | |
9517bac6 | 1172 | */ |
9517bac6 | 1173 | if (new) { |
3a307ffc MF |
1174 | wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); |
1175 | start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); | |
9517bac6 | 1176 | } else { |
3a307ffc MF |
1177 | wc->w_num_pages = 1; |
1178 | start = target_index; | |
9517bac6 MF |
1179 | } |
1180 | ||
3a307ffc | 1181 | for(i = 0; i < wc->w_num_pages; i++) { |
9517bac6 MF |
1182 | index = start + i; |
1183 | ||
7307de80 MF |
1184 | if (index == target_index && mmap_page) { |
1185 | /* | |
1186 | * ocfs2_pagemkwrite() is a little different | |
1187 | * and wants us to directly use the page | |
1188 | * passed in. | |
1189 | */ | |
1190 | lock_page(mmap_page); | |
1191 | ||
1192 | if (mmap_page->mapping != mapping) { | |
1193 | unlock_page(mmap_page); | |
1194 | /* | |
1195 | * Sanity check - the locking in | |
1196 | * ocfs2_pagemkwrite() should ensure | |
1197 | * that this code doesn't trigger. | |
1198 | */ | |
1199 | ret = -EINVAL; | |
1200 | mlog_errno(ret); | |
1201 | goto out; | |
1202 | } | |
1203 | ||
1204 | page_cache_get(mmap_page); | |
1205 | wc->w_pages[i] = mmap_page; | |
1206 | } else { | |
1207 | wc->w_pages[i] = find_or_create_page(mapping, index, | |
1208 | GFP_NOFS); | |
1209 | if (!wc->w_pages[i]) { | |
1210 | ret = -ENOMEM; | |
1211 | mlog_errno(ret); | |
1212 | goto out; | |
1213 | } | |
9517bac6 | 1214 | } |
3a307ffc MF |
1215 | |
1216 | if (index == target_index) | |
1217 | wc->w_target_page = wc->w_pages[i]; | |
9517bac6 | 1218 | } |
3a307ffc MF |
1219 | out: |
1220 | return ret; | |
1221 | } | |
1222 | ||
1223 | /* | |
1224 | * Prepare a single cluster for write one cluster into the file. | |
1225 | */ | |
1226 | static int ocfs2_write_cluster(struct address_space *mapping, | |
b27b7cbc | 1227 | u32 phys, unsigned int unwritten, |
e7432675 | 1228 | unsigned int should_zero, |
b27b7cbc | 1229 | struct ocfs2_alloc_context *data_ac, |
3a307ffc MF |
1230 | struct ocfs2_alloc_context *meta_ac, |
1231 | struct ocfs2_write_ctxt *wc, u32 cpos, | |
1232 | loff_t user_pos, unsigned user_len) | |
1233 | { | |
e7432675 | 1234 | int ret, i, new; |
3a307ffc MF |
1235 | u64 v_blkno, p_blkno; |
1236 | struct inode *inode = mapping->host; | |
f99b9b7c | 1237 | struct ocfs2_extent_tree et; |
3a307ffc MF |
1238 | |
1239 | new = phys == 0 ? 1 : 0; | |
9517bac6 | 1240 | if (new) { |
3a307ffc MF |
1241 | u32 tmp_pos; |
1242 | ||
9517bac6 MF |
1243 | /* |
1244 | * This is safe to call with the page locks - it won't take | |
1245 | * any additional semaphores or cluster locks. | |
1246 | */ | |
3a307ffc | 1247 | tmp_pos = cpos; |
0eb8d47e TM |
1248 | ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode, |
1249 | &tmp_pos, 1, 0, wc->w_di_bh, | |
1250 | wc->w_handle, data_ac, | |
1251 | meta_ac, NULL); | |
9517bac6 MF |
1252 | /* |
1253 | * This shouldn't happen because we must have already | |
1254 | * calculated the correct meta data allocation required. The | |
1255 | * internal tree allocation code should know how to increase | |
1256 | * transaction credits itself. | |
1257 | * | |
1258 | * If need be, we could handle -EAGAIN for a | |
1259 | * RESTART_TRANS here. | |
1260 | */ | |
1261 | mlog_bug_on_msg(ret == -EAGAIN, | |
1262 | "Inode %llu: EAGAIN return during allocation.\n", | |
1263 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1264 | if (ret < 0) { | |
1265 | mlog_errno(ret); | |
1266 | goto out; | |
1267 | } | |
b27b7cbc | 1268 | } else if (unwritten) { |
5e404e9e JB |
1269 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), |
1270 | wc->w_di_bh); | |
f99b9b7c | 1271 | ret = ocfs2_mark_extent_written(inode, &et, |
b27b7cbc | 1272 | wc->w_handle, cpos, 1, phys, |
f99b9b7c | 1273 | meta_ac, &wc->w_dealloc); |
b27b7cbc MF |
1274 | if (ret < 0) { |
1275 | mlog_errno(ret); | |
1276 | goto out; | |
1277 | } | |
1278 | } | |
3a307ffc | 1279 | |
b27b7cbc | 1280 | if (should_zero) |
3a307ffc | 1281 | v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos); |
b27b7cbc | 1282 | else |
3a307ffc | 1283 | v_blkno = user_pos >> inode->i_sb->s_blocksize_bits; |
9517bac6 | 1284 | |
3a307ffc MF |
1285 | /* |
1286 | * The only reason this should fail is due to an inability to | |
1287 | * find the extent added. | |
1288 | */ | |
49cb8d2d MF |
1289 | ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL, |
1290 | NULL); | |
9517bac6 | 1291 | if (ret < 0) { |
3a307ffc MF |
1292 | ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, " |
1293 | "at logical block %llu", | |
1294 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1295 | (unsigned long long)v_blkno); | |
9517bac6 MF |
1296 | goto out; |
1297 | } | |
1298 | ||
1299 | BUG_ON(p_blkno == 0); | |
1300 | ||
3a307ffc MF |
1301 | for(i = 0; i < wc->w_num_pages; i++) { |
1302 | int tmpret; | |
9517bac6 | 1303 | |
3a307ffc MF |
1304 | tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, |
1305 | wc->w_pages[i], cpos, | |
b27b7cbc MF |
1306 | user_pos, user_len, |
1307 | should_zero); | |
3a307ffc MF |
1308 | if (tmpret) { |
1309 | mlog_errno(tmpret); | |
1310 | if (ret == 0) | |
cbfa9639 | 1311 | ret = tmpret; |
3a307ffc | 1312 | } |
9517bac6 MF |
1313 | } |
1314 | ||
3a307ffc MF |
1315 | /* |
1316 | * We only have cleanup to do in case of allocating write. | |
1317 | */ | |
1318 | if (ret && new) | |
1319 | ocfs2_write_failure(inode, wc, user_pos, user_len); | |
1320 | ||
9517bac6 | 1321 | out: |
9517bac6 | 1322 | |
3a307ffc | 1323 | return ret; |
9517bac6 MF |
1324 | } |
1325 | ||
0d172baa MF |
1326 | static int ocfs2_write_cluster_by_desc(struct address_space *mapping, |
1327 | struct ocfs2_alloc_context *data_ac, | |
1328 | struct ocfs2_alloc_context *meta_ac, | |
1329 | struct ocfs2_write_ctxt *wc, | |
1330 | loff_t pos, unsigned len) | |
1331 | { | |
1332 | int ret, i; | |
db56246c MF |
1333 | loff_t cluster_off; |
1334 | unsigned int local_len = len; | |
0d172baa | 1335 | struct ocfs2_write_cluster_desc *desc; |
db56246c | 1336 | struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); |
0d172baa MF |
1337 | |
1338 | for (i = 0; i < wc->w_clen; i++) { | |
1339 | desc = &wc->w_desc[i]; | |
1340 | ||
db56246c MF |
1341 | /* |
1342 | * We have to make sure that the total write passed in | |
1343 | * doesn't extend past a single cluster. | |
1344 | */ | |
1345 | local_len = len; | |
1346 | cluster_off = pos & (osb->s_clustersize - 1); | |
1347 | if ((cluster_off + local_len) > osb->s_clustersize) | |
1348 | local_len = osb->s_clustersize - cluster_off; | |
1349 | ||
b27b7cbc | 1350 | ret = ocfs2_write_cluster(mapping, desc->c_phys, |
e7432675 SM |
1351 | desc->c_unwritten, |
1352 | desc->c_needs_zero, | |
1353 | data_ac, meta_ac, | |
db56246c | 1354 | wc, desc->c_cpos, pos, local_len); |
0d172baa MF |
1355 | if (ret) { |
1356 | mlog_errno(ret); | |
1357 | goto out; | |
1358 | } | |
db56246c MF |
1359 | |
1360 | len -= local_len; | |
1361 | pos += local_len; | |
0d172baa MF |
1362 | } |
1363 | ||
1364 | ret = 0; | |
1365 | out: | |
1366 | return ret; | |
1367 | } | |
1368 | ||
3a307ffc MF |
1369 | /* |
1370 | * ocfs2_write_end() wants to know which parts of the target page it | |
1371 | * should complete the write on. It's easiest to compute them ahead of | |
1372 | * time when a more complete view of the write is available. | |
1373 | */ | |
1374 | static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, | |
1375 | struct ocfs2_write_ctxt *wc, | |
1376 | loff_t pos, unsigned len, int alloc) | |
9517bac6 | 1377 | { |
3a307ffc | 1378 | struct ocfs2_write_cluster_desc *desc; |
9517bac6 | 1379 | |
3a307ffc MF |
1380 | wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1); |
1381 | wc->w_target_to = wc->w_target_from + len; | |
1382 | ||
1383 | if (alloc == 0) | |
1384 | return; | |
1385 | ||
1386 | /* | |
1387 | * Allocating write - we may have different boundaries based | |
1388 | * on page size and cluster size. | |
1389 | * | |
1390 | * NOTE: We can no longer compute one value from the other as | |
1391 | * the actual write length and user provided length may be | |
1392 | * different. | |
1393 | */ | |
9517bac6 | 1394 | |
3a307ffc MF |
1395 | if (wc->w_large_pages) { |
1396 | /* | |
1397 | * We only care about the 1st and last cluster within | |
b27b7cbc | 1398 | * our range and whether they should be zero'd or not. Either |
3a307ffc MF |
1399 | * value may be extended out to the start/end of a |
1400 | * newly allocated cluster. | |
1401 | */ | |
1402 | desc = &wc->w_desc[0]; | |
e7432675 | 1403 | if (desc->c_needs_zero) |
3a307ffc MF |
1404 | ocfs2_figure_cluster_boundaries(osb, |
1405 | desc->c_cpos, | |
1406 | &wc->w_target_from, | |
1407 | NULL); | |
1408 | ||
1409 | desc = &wc->w_desc[wc->w_clen - 1]; | |
e7432675 | 1410 | if (desc->c_needs_zero) |
3a307ffc MF |
1411 | ocfs2_figure_cluster_boundaries(osb, |
1412 | desc->c_cpos, | |
1413 | NULL, | |
1414 | &wc->w_target_to); | |
1415 | } else { | |
1416 | wc->w_target_from = 0; | |
1417 | wc->w_target_to = PAGE_CACHE_SIZE; | |
1418 | } | |
9517bac6 MF |
1419 | } |
1420 | ||
0d172baa MF |
1421 | /* |
1422 | * Populate each single-cluster write descriptor in the write context | |
1423 | * with information about the i/o to be done. | |
b27b7cbc MF |
1424 | * |
1425 | * Returns the number of clusters that will have to be allocated, as | |
1426 | * well as a worst case estimate of the number of extent records that | |
1427 | * would have to be created during a write to an unwritten region. | |
0d172baa MF |
1428 | */ |
1429 | static int ocfs2_populate_write_desc(struct inode *inode, | |
1430 | struct ocfs2_write_ctxt *wc, | |
b27b7cbc MF |
1431 | unsigned int *clusters_to_alloc, |
1432 | unsigned int *extents_to_split) | |
9517bac6 | 1433 | { |
0d172baa | 1434 | int ret; |
3a307ffc | 1435 | struct ocfs2_write_cluster_desc *desc; |
0d172baa | 1436 | unsigned int num_clusters = 0; |
b27b7cbc | 1437 | unsigned int ext_flags = 0; |
0d172baa MF |
1438 | u32 phys = 0; |
1439 | int i; | |
9517bac6 | 1440 | |
b27b7cbc MF |
1441 | *clusters_to_alloc = 0; |
1442 | *extents_to_split = 0; | |
1443 | ||
3a307ffc MF |
1444 | for (i = 0; i < wc->w_clen; i++) { |
1445 | desc = &wc->w_desc[i]; | |
1446 | desc->c_cpos = wc->w_cpos + i; | |
1447 | ||
1448 | if (num_clusters == 0) { | |
b27b7cbc MF |
1449 | /* |
1450 | * Need to look up the next extent record. | |
1451 | */ | |
3a307ffc | 1452 | ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, |
b27b7cbc | 1453 | &num_clusters, &ext_flags); |
3a307ffc MF |
1454 | if (ret) { |
1455 | mlog_errno(ret); | |
607d44aa | 1456 | goto out; |
3a307ffc | 1457 | } |
b27b7cbc | 1458 | |
293b2f70 TM |
1459 | /* We should already CoW the refcountd extent. */ |
1460 | BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED); | |
1461 | ||
b27b7cbc MF |
1462 | /* |
1463 | * Assume worst case - that we're writing in | |
1464 | * the middle of the extent. | |
1465 | * | |
1466 | * We can assume that the write proceeds from | |
1467 | * left to right, in which case the extent | |
1468 | * insert code is smart enough to coalesce the | |
1469 | * next splits into the previous records created. | |
1470 | */ | |
1471 | if (ext_flags & OCFS2_EXT_UNWRITTEN) | |
1472 | *extents_to_split = *extents_to_split + 2; | |
3a307ffc MF |
1473 | } else if (phys) { |
1474 | /* | |
1475 | * Only increment phys if it doesn't describe | |
1476 | * a hole. | |
1477 | */ | |
1478 | phys++; | |
1479 | } | |
1480 | ||
e7432675 SM |
1481 | /* |
1482 | * If w_first_new_cpos is < UINT_MAX, we have a non-sparse | |
1483 | * file that got extended. w_first_new_cpos tells us | |
1484 | * where the newly allocated clusters are so we can | |
1485 | * zero them. | |
1486 | */ | |
1487 | if (desc->c_cpos >= wc->w_first_new_cpos) { | |
1488 | BUG_ON(phys == 0); | |
1489 | desc->c_needs_zero = 1; | |
1490 | } | |
1491 | ||
3a307ffc MF |
1492 | desc->c_phys = phys; |
1493 | if (phys == 0) { | |
1494 | desc->c_new = 1; | |
e7432675 | 1495 | desc->c_needs_zero = 1; |
0d172baa | 1496 | *clusters_to_alloc = *clusters_to_alloc + 1; |
3a307ffc | 1497 | } |
e7432675 SM |
1498 | |
1499 | if (ext_flags & OCFS2_EXT_UNWRITTEN) { | |
b27b7cbc | 1500 | desc->c_unwritten = 1; |
e7432675 SM |
1501 | desc->c_needs_zero = 1; |
1502 | } | |
3a307ffc MF |
1503 | |
1504 | num_clusters--; | |
9517bac6 MF |
1505 | } |
1506 | ||
0d172baa MF |
1507 | ret = 0; |
1508 | out: | |
1509 | return ret; | |
1510 | } | |
1511 | ||
1afc32b9 MF |
1512 | static int ocfs2_write_begin_inline(struct address_space *mapping, |
1513 | struct inode *inode, | |
1514 | struct ocfs2_write_ctxt *wc) | |
1515 | { | |
1516 | int ret; | |
1517 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1518 | struct page *page; | |
1519 | handle_t *handle; | |
1520 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1521 | ||
1522 | page = find_or_create_page(mapping, 0, GFP_NOFS); | |
1523 | if (!page) { | |
1524 | ret = -ENOMEM; | |
1525 | mlog_errno(ret); | |
1526 | goto out; | |
1527 | } | |
1528 | /* | |
1529 | * If we don't set w_num_pages then this page won't get unlocked | |
1530 | * and freed on cleanup of the write context. | |
1531 | */ | |
1532 | wc->w_pages[0] = wc->w_target_page = page; | |
1533 | wc->w_num_pages = 1; | |
1534 | ||
1535 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
1536 | if (IS_ERR(handle)) { | |
1537 | ret = PTR_ERR(handle); | |
1538 | mlog_errno(ret); | |
1539 | goto out; | |
1540 | } | |
1541 | ||
0cf2f763 | 1542 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, |
13723d00 | 1543 | OCFS2_JOURNAL_ACCESS_WRITE); |
1afc32b9 MF |
1544 | if (ret) { |
1545 | ocfs2_commit_trans(osb, handle); | |
1546 | ||
1547 | mlog_errno(ret); | |
1548 | goto out; | |
1549 | } | |
1550 | ||
1551 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) | |
1552 | ocfs2_set_inode_data_inline(inode, di); | |
1553 | ||
1554 | if (!PageUptodate(page)) { | |
1555 | ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh); | |
1556 | if (ret) { | |
1557 | ocfs2_commit_trans(osb, handle); | |
1558 | ||
1559 | goto out; | |
1560 | } | |
1561 | } | |
1562 | ||
1563 | wc->w_handle = handle; | |
1564 | out: | |
1565 | return ret; | |
1566 | } | |
1567 | ||
1568 | int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size) | |
1569 | { | |
1570 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
1571 | ||
0d8a4e0c | 1572 | if (new_size <= le16_to_cpu(di->id2.i_data.id_count)) |
1afc32b9 MF |
1573 | return 1; |
1574 | return 0; | |
1575 | } | |
1576 | ||
1577 | static int ocfs2_try_to_write_inline_data(struct address_space *mapping, | |
1578 | struct inode *inode, loff_t pos, | |
1579 | unsigned len, struct page *mmap_page, | |
1580 | struct ocfs2_write_ctxt *wc) | |
1581 | { | |
1582 | int ret, written = 0; | |
1583 | loff_t end = pos + len; | |
1584 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
d9ae49d6 | 1585 | struct ocfs2_dinode *di = NULL; |
1afc32b9 MF |
1586 | |
1587 | mlog(0, "Inode %llu, write of %u bytes at off %llu. features: 0x%x\n", | |
1588 | (unsigned long long)oi->ip_blkno, len, (unsigned long long)pos, | |
1589 | oi->ip_dyn_features); | |
1590 | ||
1591 | /* | |
1592 | * Handle inodes which already have inline data 1st. | |
1593 | */ | |
1594 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { | |
1595 | if (mmap_page == NULL && | |
1596 | ocfs2_size_fits_inline_data(wc->w_di_bh, end)) | |
1597 | goto do_inline_write; | |
1598 | ||
1599 | /* | |
1600 | * The write won't fit - we have to give this inode an | |
1601 | * inline extent list now. | |
1602 | */ | |
1603 | ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh); | |
1604 | if (ret) | |
1605 | mlog_errno(ret); | |
1606 | goto out; | |
1607 | } | |
1608 | ||
1609 | /* | |
1610 | * Check whether the inode can accept inline data. | |
1611 | */ | |
1612 | if (oi->ip_clusters != 0 || i_size_read(inode) != 0) | |
1613 | return 0; | |
1614 | ||
1615 | /* | |
1616 | * Check whether the write can fit. | |
1617 | */ | |
d9ae49d6 TY |
1618 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
1619 | if (mmap_page || | |
1620 | end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) | |
1afc32b9 MF |
1621 | return 0; |
1622 | ||
1623 | do_inline_write: | |
1624 | ret = ocfs2_write_begin_inline(mapping, inode, wc); | |
1625 | if (ret) { | |
1626 | mlog_errno(ret); | |
1627 | goto out; | |
1628 | } | |
1629 | ||
1630 | /* | |
1631 | * This signals to the caller that the data can be written | |
1632 | * inline. | |
1633 | */ | |
1634 | written = 1; | |
1635 | out: | |
1636 | return written ? written : ret; | |
1637 | } | |
1638 | ||
65ed39d6 MF |
1639 | /* |
1640 | * This function only does anything for file systems which can't | |
1641 | * handle sparse files. | |
1642 | * | |
1643 | * What we want to do here is fill in any hole between the current end | |
1644 | * of allocation and the end of our write. That way the rest of the | |
1645 | * write path can treat it as an non-allocating write, which has no | |
1646 | * special case code for sparse/nonsparse files. | |
1647 | */ | |
1648 | static int ocfs2_expand_nonsparse_inode(struct inode *inode, loff_t pos, | |
1649 | unsigned len, | |
1650 | struct ocfs2_write_ctxt *wc) | |
1651 | { | |
1652 | int ret; | |
1653 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1654 | loff_t newsize = pos + len; | |
1655 | ||
1656 | if (ocfs2_sparse_alloc(osb)) | |
1657 | return 0; | |
1658 | ||
1659 | if (newsize <= i_size_read(inode)) | |
1660 | return 0; | |
1661 | ||
e7432675 | 1662 | ret = ocfs2_extend_no_holes(inode, newsize, pos); |
65ed39d6 MF |
1663 | if (ret) |
1664 | mlog_errno(ret); | |
1665 | ||
e7432675 SM |
1666 | wc->w_first_new_cpos = |
1667 | ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)); | |
1668 | ||
65ed39d6 MF |
1669 | return ret; |
1670 | } | |
1671 | ||
0d172baa MF |
1672 | int ocfs2_write_begin_nolock(struct address_space *mapping, |
1673 | loff_t pos, unsigned len, unsigned flags, | |
1674 | struct page **pagep, void **fsdata, | |
1675 | struct buffer_head *di_bh, struct page *mmap_page) | |
1676 | { | |
e7432675 | 1677 | int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS; |
b27b7cbc | 1678 | unsigned int clusters_to_alloc, extents_to_split; |
0d172baa MF |
1679 | struct ocfs2_write_ctxt *wc; |
1680 | struct inode *inode = mapping->host; | |
1681 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1682 | struct ocfs2_dinode *di; | |
1683 | struct ocfs2_alloc_context *data_ac = NULL; | |
1684 | struct ocfs2_alloc_context *meta_ac = NULL; | |
1685 | handle_t *handle; | |
f99b9b7c | 1686 | struct ocfs2_extent_tree et; |
0d172baa MF |
1687 | |
1688 | ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh); | |
1689 | if (ret) { | |
1690 | mlog_errno(ret); | |
1691 | return ret; | |
1692 | } | |
1693 | ||
1afc32b9 MF |
1694 | if (ocfs2_supports_inline_data(osb)) { |
1695 | ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len, | |
1696 | mmap_page, wc); | |
1697 | if (ret == 1) { | |
1698 | ret = 0; | |
1699 | goto success; | |
1700 | } | |
1701 | if (ret < 0) { | |
1702 | mlog_errno(ret); | |
1703 | goto out; | |
1704 | } | |
1705 | } | |
1706 | ||
65ed39d6 MF |
1707 | ret = ocfs2_expand_nonsparse_inode(inode, pos, len, wc); |
1708 | if (ret) { | |
1709 | mlog_errno(ret); | |
1710 | goto out; | |
1711 | } | |
1712 | ||
293b2f70 TM |
1713 | ret = ocfs2_check_range_for_refcount(inode, pos, len); |
1714 | if (ret < 0) { | |
1715 | mlog_errno(ret); | |
1716 | goto out; | |
1717 | } else if (ret == 1) { | |
1718 | ret = ocfs2_refcount_cow(inode, di_bh, | |
37f8a2bf | 1719 | wc->w_cpos, wc->w_clen, UINT_MAX); |
293b2f70 TM |
1720 | if (ret) { |
1721 | mlog_errno(ret); | |
1722 | goto out; | |
1723 | } | |
1724 | } | |
1725 | ||
b27b7cbc MF |
1726 | ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc, |
1727 | &extents_to_split); | |
0d172baa MF |
1728 | if (ret) { |
1729 | mlog_errno(ret); | |
1730 | goto out; | |
1731 | } | |
1732 | ||
1733 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1734 | ||
3a307ffc MF |
1735 | /* |
1736 | * We set w_target_from, w_target_to here so that | |
1737 | * ocfs2_write_end() knows which range in the target page to | |
1738 | * write out. An allocation requires that we write the entire | |
1739 | * cluster range. | |
1740 | */ | |
b27b7cbc | 1741 | if (clusters_to_alloc || extents_to_split) { |
3a307ffc MF |
1742 | /* |
1743 | * XXX: We are stretching the limits of | |
b27b7cbc | 1744 | * ocfs2_lock_allocators(). It greatly over-estimates |
3a307ffc MF |
1745 | * the work to be done. |
1746 | */ | |
e7d4cb6b TM |
1747 | mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u," |
1748 | " clusters_to_add = %u, extents_to_split = %u\n", | |
1749 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1750 | (long long)i_size_read(inode), le32_to_cpu(di->i_clusters), | |
1751 | clusters_to_alloc, extents_to_split); | |
1752 | ||
5e404e9e JB |
1753 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), |
1754 | wc->w_di_bh); | |
f99b9b7c | 1755 | ret = ocfs2_lock_allocators(inode, &et, |
231b87d1 | 1756 | clusters_to_alloc, extents_to_split, |
f99b9b7c | 1757 | &data_ac, &meta_ac); |
9517bac6 MF |
1758 | if (ret) { |
1759 | mlog_errno(ret); | |
607d44aa | 1760 | goto out; |
9517bac6 MF |
1761 | } |
1762 | ||
811f933d TM |
1763 | credits = ocfs2_calc_extend_credits(inode->i_sb, |
1764 | &di->id2.i_list, | |
3a307ffc MF |
1765 | clusters_to_alloc); |
1766 | ||
9517bac6 MF |
1767 | } |
1768 | ||
e7432675 SM |
1769 | /* |
1770 | * We have to zero sparse allocated clusters, unwritten extent clusters, | |
1771 | * and non-sparse clusters we just extended. For non-sparse writes, | |
1772 | * we know zeros will only be needed in the first and/or last cluster. | |
1773 | */ | |
1774 | if (clusters_to_alloc || extents_to_split || | |
8379e7c4 SM |
1775 | (wc->w_clen && (wc->w_desc[0].c_needs_zero || |
1776 | wc->w_desc[wc->w_clen - 1].c_needs_zero))) | |
e7432675 SM |
1777 | cluster_of_pages = 1; |
1778 | else | |
1779 | cluster_of_pages = 0; | |
1780 | ||
1781 | ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages); | |
3a307ffc | 1782 | |
9517bac6 MF |
1783 | handle = ocfs2_start_trans(osb, credits); |
1784 | if (IS_ERR(handle)) { | |
1785 | ret = PTR_ERR(handle); | |
1786 | mlog_errno(ret); | |
607d44aa | 1787 | goto out; |
9517bac6 MF |
1788 | } |
1789 | ||
3a307ffc MF |
1790 | wc->w_handle = handle; |
1791 | ||
a90714c1 JK |
1792 | if (clusters_to_alloc && vfs_dq_alloc_space_nodirty(inode, |
1793 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc))) { | |
1794 | ret = -EDQUOT; | |
1795 | goto out_commit; | |
1796 | } | |
3a307ffc MF |
1797 | /* |
1798 | * We don't want this to fail in ocfs2_write_end(), so do it | |
1799 | * here. | |
1800 | */ | |
0cf2f763 | 1801 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, |
13723d00 | 1802 | OCFS2_JOURNAL_ACCESS_WRITE); |
3a307ffc | 1803 | if (ret) { |
9517bac6 | 1804 | mlog_errno(ret); |
a90714c1 | 1805 | goto out_quota; |
9517bac6 MF |
1806 | } |
1807 | ||
3a307ffc MF |
1808 | /* |
1809 | * Fill our page array first. That way we've grabbed enough so | |
1810 | * that we can zero and flush if we error after adding the | |
1811 | * extent. | |
1812 | */ | |
1813 | ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, | |
e7432675 | 1814 | cluster_of_pages, mmap_page); |
9517bac6 MF |
1815 | if (ret) { |
1816 | mlog_errno(ret); | |
a90714c1 | 1817 | goto out_quota; |
9517bac6 MF |
1818 | } |
1819 | ||
0d172baa MF |
1820 | ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos, |
1821 | len); | |
1822 | if (ret) { | |
1823 | mlog_errno(ret); | |
a90714c1 | 1824 | goto out_quota; |
9517bac6 | 1825 | } |
9517bac6 | 1826 | |
3a307ffc MF |
1827 | if (data_ac) |
1828 | ocfs2_free_alloc_context(data_ac); | |
1829 | if (meta_ac) | |
1830 | ocfs2_free_alloc_context(meta_ac); | |
9517bac6 | 1831 | |
1afc32b9 | 1832 | success: |
3a307ffc MF |
1833 | *pagep = wc->w_target_page; |
1834 | *fsdata = wc; | |
1835 | return 0; | |
a90714c1 JK |
1836 | out_quota: |
1837 | if (clusters_to_alloc) | |
1838 | vfs_dq_free_space(inode, | |
1839 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); | |
9517bac6 MF |
1840 | out_commit: |
1841 | ocfs2_commit_trans(osb, handle); | |
1842 | ||
9517bac6 | 1843 | out: |
3a307ffc MF |
1844 | ocfs2_free_write_ctxt(wc); |
1845 | ||
9517bac6 MF |
1846 | if (data_ac) |
1847 | ocfs2_free_alloc_context(data_ac); | |
1848 | if (meta_ac) | |
1849 | ocfs2_free_alloc_context(meta_ac); | |
3a307ffc MF |
1850 | return ret; |
1851 | } | |
1852 | ||
b6af1bcd NP |
1853 | static int ocfs2_write_begin(struct file *file, struct address_space *mapping, |
1854 | loff_t pos, unsigned len, unsigned flags, | |
1855 | struct page **pagep, void **fsdata) | |
607d44aa MF |
1856 | { |
1857 | int ret; | |
1858 | struct buffer_head *di_bh = NULL; | |
1859 | struct inode *inode = mapping->host; | |
1860 | ||
e63aecb6 | 1861 | ret = ocfs2_inode_lock(inode, &di_bh, 1); |
607d44aa MF |
1862 | if (ret) { |
1863 | mlog_errno(ret); | |
1864 | return ret; | |
1865 | } | |
1866 | ||
1867 | /* | |
1868 | * Take alloc sem here to prevent concurrent lookups. That way | |
1869 | * the mapping, zeroing and tree manipulation within | |
1870 | * ocfs2_write() will be safe against ->readpage(). This | |
1871 | * should also serve to lock out allocation from a shared | |
1872 | * writeable region. | |
1873 | */ | |
1874 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1875 | ||
607d44aa | 1876 | ret = ocfs2_write_begin_nolock(mapping, pos, len, flags, pagep, |
7307de80 | 1877 | fsdata, di_bh, NULL); |
607d44aa MF |
1878 | if (ret) { |
1879 | mlog_errno(ret); | |
c934a92d | 1880 | goto out_fail; |
607d44aa MF |
1881 | } |
1882 | ||
1883 | brelse(di_bh); | |
1884 | ||
1885 | return 0; | |
1886 | ||
607d44aa MF |
1887 | out_fail: |
1888 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1889 | ||
1890 | brelse(di_bh); | |
e63aecb6 | 1891 | ocfs2_inode_unlock(inode, 1); |
607d44aa MF |
1892 | |
1893 | return ret; | |
1894 | } | |
1895 | ||
1afc32b9 MF |
1896 | static void ocfs2_write_end_inline(struct inode *inode, loff_t pos, |
1897 | unsigned len, unsigned *copied, | |
1898 | struct ocfs2_dinode *di, | |
1899 | struct ocfs2_write_ctxt *wc) | |
1900 | { | |
1901 | void *kaddr; | |
1902 | ||
1903 | if (unlikely(*copied < len)) { | |
1904 | if (!PageUptodate(wc->w_target_page)) { | |
1905 | *copied = 0; | |
1906 | return; | |
1907 | } | |
1908 | } | |
1909 | ||
1910 | kaddr = kmap_atomic(wc->w_target_page, KM_USER0); | |
1911 | memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied); | |
1912 | kunmap_atomic(kaddr, KM_USER0); | |
1913 | ||
1914 | mlog(0, "Data written to inode at offset %llu. " | |
1915 | "id_count = %u, copied = %u, i_dyn_features = 0x%x\n", | |
1916 | (unsigned long long)pos, *copied, | |
1917 | le16_to_cpu(di->id2.i_data.id_count), | |
1918 | le16_to_cpu(di->i_dyn_features)); | |
1919 | } | |
1920 | ||
7307de80 MF |
1921 | int ocfs2_write_end_nolock(struct address_space *mapping, |
1922 | loff_t pos, unsigned len, unsigned copied, | |
1923 | struct page *page, void *fsdata) | |
3a307ffc MF |
1924 | { |
1925 | int i; | |
1926 | unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1); | |
1927 | struct inode *inode = mapping->host; | |
1928 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1929 | struct ocfs2_write_ctxt *wc = fsdata; | |
1930 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1931 | handle_t *handle = wc->w_handle; | |
1932 | struct page *tmppage; | |
1933 | ||
1afc32b9 MF |
1934 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
1935 | ocfs2_write_end_inline(inode, pos, len, &copied, di, wc); | |
1936 | goto out_write_size; | |
1937 | } | |
1938 | ||
3a307ffc MF |
1939 | if (unlikely(copied < len)) { |
1940 | if (!PageUptodate(wc->w_target_page)) | |
1941 | copied = 0; | |
1942 | ||
1943 | ocfs2_zero_new_buffers(wc->w_target_page, start+copied, | |
1944 | start+len); | |
1945 | } | |
1946 | flush_dcache_page(wc->w_target_page); | |
1947 | ||
1948 | for(i = 0; i < wc->w_num_pages; i++) { | |
1949 | tmppage = wc->w_pages[i]; | |
1950 | ||
1951 | if (tmppage == wc->w_target_page) { | |
1952 | from = wc->w_target_from; | |
1953 | to = wc->w_target_to; | |
1954 | ||
1955 | BUG_ON(from > PAGE_CACHE_SIZE || | |
1956 | to > PAGE_CACHE_SIZE || | |
1957 | to < from); | |
1958 | } else { | |
1959 | /* | |
1960 | * Pages adjacent to the target (if any) imply | |
1961 | * a hole-filling write in which case we want | |
1962 | * to flush their entire range. | |
1963 | */ | |
1964 | from = 0; | |
1965 | to = PAGE_CACHE_SIZE; | |
1966 | } | |
1967 | ||
961cecbe | 1968 | if (page_has_buffers(tmppage)) { |
53ef99ca | 1969 | if (ocfs2_should_order_data(inode)) |
2b4e30fb | 1970 | ocfs2_jbd2_file_inode(wc->w_handle, inode); |
961cecbe SM |
1971 | block_commit_write(tmppage, from, to); |
1972 | } | |
3a307ffc MF |
1973 | } |
1974 | ||
1afc32b9 | 1975 | out_write_size: |
3a307ffc MF |
1976 | pos += copied; |
1977 | if (pos > inode->i_size) { | |
1978 | i_size_write(inode, pos); | |
1979 | mark_inode_dirty(inode); | |
1980 | } | |
1981 | inode->i_blocks = ocfs2_inode_sector_count(inode); | |
1982 | di->i_size = cpu_to_le64((u64)i_size_read(inode)); | |
1983 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
1984 | di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); | |
1985 | di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
3a307ffc MF |
1986 | ocfs2_journal_dirty(handle, wc->w_di_bh); |
1987 | ||
1988 | ocfs2_commit_trans(osb, handle); | |
59a5e416 | 1989 | |
b27b7cbc MF |
1990 | ocfs2_run_deallocs(osb, &wc->w_dealloc); |
1991 | ||
607d44aa MF |
1992 | ocfs2_free_write_ctxt(wc); |
1993 | ||
1994 | return copied; | |
1995 | } | |
1996 | ||
b6af1bcd NP |
1997 | static int ocfs2_write_end(struct file *file, struct address_space *mapping, |
1998 | loff_t pos, unsigned len, unsigned copied, | |
1999 | struct page *page, void *fsdata) | |
607d44aa MF |
2000 | { |
2001 | int ret; | |
2002 | struct inode *inode = mapping->host; | |
2003 | ||
2004 | ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata); | |
2005 | ||
3a307ffc | 2006 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
e63aecb6 | 2007 | ocfs2_inode_unlock(inode, 1); |
9517bac6 | 2008 | |
607d44aa | 2009 | return ret; |
9517bac6 MF |
2010 | } |
2011 | ||
f5e54d6e | 2012 | const struct address_space_operations ocfs2_aops = { |
1fca3a05 HH |
2013 | .readpage = ocfs2_readpage, |
2014 | .readpages = ocfs2_readpages, | |
2015 | .writepage = ocfs2_writepage, | |
2016 | .write_begin = ocfs2_write_begin, | |
2017 | .write_end = ocfs2_write_end, | |
2018 | .bmap = ocfs2_bmap, | |
2019 | .sync_page = block_sync_page, | |
2020 | .direct_IO = ocfs2_direct_IO, | |
2021 | .invalidatepage = ocfs2_invalidatepage, | |
2022 | .releasepage = ocfs2_releasepage, | |
2023 | .migratepage = buffer_migrate_page, | |
2024 | .is_partially_uptodate = block_is_partially_uptodate, | |
aa261f54 | 2025 | .error_remove_page = generic_error_remove_page, |
ccd979bd | 2026 | }; |