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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" | |
47 | ||
48 | #include "buffer_head_io.h" | |
49 | ||
50 | static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock, | |
51 | struct buffer_head *bh_result, int create) | |
52 | { | |
53 | int err = -EIO; | |
54 | int status; | |
55 | struct ocfs2_dinode *fe = NULL; | |
56 | struct buffer_head *bh = NULL; | |
57 | struct buffer_head *buffer_cache_bh = NULL; | |
58 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
59 | void *kaddr; | |
60 | ||
61 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, | |
62 | (unsigned long long)iblock, bh_result, create); | |
63 | ||
64 | BUG_ON(ocfs2_inode_is_fast_symlink(inode)); | |
65 | ||
66 | if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) { | |
67 | mlog(ML_ERROR, "block offset > PATH_MAX: %llu", | |
68 | (unsigned long long)iblock); | |
69 | goto bail; | |
70 | } | |
71 | ||
b657c95c | 72 | status = ocfs2_read_inode_block(inode, &bh); |
ccd979bd MF |
73 | if (status < 0) { |
74 | mlog_errno(status); | |
75 | goto bail; | |
76 | } | |
77 | fe = (struct ocfs2_dinode *) bh->b_data; | |
78 | ||
ccd979bd MF |
79 | if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, |
80 | le32_to_cpu(fe->i_clusters))) { | |
81 | mlog(ML_ERROR, "block offset is outside the allocated size: " | |
82 | "%llu\n", (unsigned long long)iblock); | |
83 | goto bail; | |
84 | } | |
85 | ||
86 | /* We don't use the page cache to create symlink data, so if | |
87 | * need be, copy it over from the buffer cache. */ | |
88 | if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { | |
89 | u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + | |
90 | iblock; | |
91 | buffer_cache_bh = sb_getblk(osb->sb, blkno); | |
92 | if (!buffer_cache_bh) { | |
93 | mlog(ML_ERROR, "couldn't getblock for symlink!\n"); | |
94 | goto bail; | |
95 | } | |
96 | ||
97 | /* we haven't locked out transactions, so a commit | |
98 | * could've happened. Since we've got a reference on | |
99 | * the bh, even if it commits while we're doing the | |
100 | * copy, the data is still good. */ | |
101 | if (buffer_jbd(buffer_cache_bh) | |
102 | && ocfs2_inode_is_new(inode)) { | |
103 | kaddr = kmap_atomic(bh_result->b_page, KM_USER0); | |
104 | if (!kaddr) { | |
105 | mlog(ML_ERROR, "couldn't kmap!\n"); | |
106 | goto bail; | |
107 | } | |
108 | memcpy(kaddr + (bh_result->b_size * iblock), | |
109 | buffer_cache_bh->b_data, | |
110 | bh_result->b_size); | |
111 | kunmap_atomic(kaddr, KM_USER0); | |
112 | set_buffer_uptodate(bh_result); | |
113 | } | |
114 | brelse(buffer_cache_bh); | |
115 | } | |
116 | ||
117 | map_bh(bh_result, inode->i_sb, | |
118 | le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); | |
119 | ||
120 | err = 0; | |
121 | ||
122 | bail: | |
a81cb88b | 123 | brelse(bh); |
ccd979bd MF |
124 | |
125 | mlog_exit(err); | |
126 | return err; | |
127 | } | |
128 | ||
129 | static int ocfs2_get_block(struct inode *inode, sector_t iblock, | |
130 | struct buffer_head *bh_result, int create) | |
131 | { | |
132 | int err = 0; | |
49cb8d2d | 133 | unsigned int ext_flags; |
628a24f5 MF |
134 | u64 max_blocks = bh_result->b_size >> inode->i_blkbits; |
135 | u64 p_blkno, count, past_eof; | |
25baf2da | 136 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
137 | |
138 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, | |
139 | (unsigned long long)iblock, bh_result, create); | |
140 | ||
141 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) | |
142 | mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", | |
143 | inode, inode->i_ino); | |
144 | ||
145 | if (S_ISLNK(inode->i_mode)) { | |
146 | /* this always does I/O for some reason. */ | |
147 | err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); | |
148 | goto bail; | |
149 | } | |
150 | ||
628a24f5 | 151 | err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count, |
49cb8d2d | 152 | &ext_flags); |
ccd979bd MF |
153 | if (err) { |
154 | mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " | |
b0697053 MF |
155 | "%llu, NULL)\n", err, inode, (unsigned long long)iblock, |
156 | (unsigned long long)p_blkno); | |
ccd979bd MF |
157 | goto bail; |
158 | } | |
159 | ||
628a24f5 MF |
160 | if (max_blocks < count) |
161 | count = max_blocks; | |
162 | ||
25baf2da MF |
163 | /* |
164 | * ocfs2 never allocates in this function - the only time we | |
165 | * need to use BH_New is when we're extending i_size on a file | |
166 | * system which doesn't support holes, in which case BH_New | |
167 | * allows block_prepare_write() to zero. | |
c0420ad2 CL |
168 | * |
169 | * If we see this on a sparse file system, then a truncate has | |
170 | * raced us and removed the cluster. In this case, we clear | |
171 | * the buffers dirty and uptodate bits and let the buffer code | |
172 | * ignore it as a hole. | |
25baf2da | 173 | */ |
c0420ad2 CL |
174 | if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) { |
175 | clear_buffer_dirty(bh_result); | |
176 | clear_buffer_uptodate(bh_result); | |
177 | goto bail; | |
178 | } | |
25baf2da | 179 | |
49cb8d2d MF |
180 | /* Treat the unwritten extent as a hole for zeroing purposes. */ |
181 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) | |
25baf2da MF |
182 | map_bh(bh_result, inode->i_sb, p_blkno); |
183 | ||
628a24f5 MF |
184 | bh_result->b_size = count << inode->i_blkbits; |
185 | ||
25baf2da MF |
186 | if (!ocfs2_sparse_alloc(osb)) { |
187 | if (p_blkno == 0) { | |
188 | err = -EIO; | |
189 | mlog(ML_ERROR, | |
190 | "iblock = %llu p_blkno = %llu blkno=(%llu)\n", | |
191 | (unsigned long long)iblock, | |
192 | (unsigned long long)p_blkno, | |
193 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
194 | mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); | |
195 | dump_stack(); | |
196 | } | |
ccd979bd | 197 | |
25baf2da MF |
198 | past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
199 | mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino, | |
200 | (unsigned long long)past_eof); | |
ccd979bd | 201 | |
25baf2da MF |
202 | if (create && (iblock >= past_eof)) |
203 | set_buffer_new(bh_result); | |
204 | } | |
ccd979bd MF |
205 | |
206 | bail: | |
207 | if (err < 0) | |
208 | err = -EIO; | |
209 | ||
210 | mlog_exit(err); | |
211 | return err; | |
212 | } | |
213 | ||
1afc32b9 MF |
214 | int ocfs2_read_inline_data(struct inode *inode, struct page *page, |
215 | struct buffer_head *di_bh) | |
6798d35a MF |
216 | { |
217 | void *kaddr; | |
d2849fb2 | 218 | loff_t size; |
6798d35a MF |
219 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
220 | ||
221 | if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) { | |
222 | ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag", | |
223 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
224 | return -EROFS; | |
225 | } | |
226 | ||
227 | size = i_size_read(inode); | |
228 | ||
229 | if (size > PAGE_CACHE_SIZE || | |
230 | size > ocfs2_max_inline_data(inode->i_sb)) { | |
231 | ocfs2_error(inode->i_sb, | |
d2849fb2 JK |
232 | "Inode %llu has with inline data has bad size: %Lu", |
233 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
234 | (unsigned long long)size); | |
6798d35a MF |
235 | return -EROFS; |
236 | } | |
237 | ||
238 | kaddr = kmap_atomic(page, KM_USER0); | |
239 | if (size) | |
240 | memcpy(kaddr, di->id2.i_data.id_data, size); | |
241 | /* Clear the remaining part of the page */ | |
242 | memset(kaddr + size, 0, PAGE_CACHE_SIZE - size); | |
243 | flush_dcache_page(page); | |
244 | kunmap_atomic(kaddr, KM_USER0); | |
245 | ||
246 | SetPageUptodate(page); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | static int ocfs2_readpage_inline(struct inode *inode, struct page *page) | |
252 | { | |
253 | int ret; | |
254 | struct buffer_head *di_bh = NULL; | |
6798d35a MF |
255 | |
256 | BUG_ON(!PageLocked(page)); | |
86c838b0 | 257 | BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)); |
6798d35a | 258 | |
b657c95c | 259 | ret = ocfs2_read_inode_block(inode, &di_bh); |
6798d35a MF |
260 | if (ret) { |
261 | mlog_errno(ret); | |
262 | goto out; | |
263 | } | |
264 | ||
265 | ret = ocfs2_read_inline_data(inode, page, di_bh); | |
266 | out: | |
267 | unlock_page(page); | |
268 | ||
269 | brelse(di_bh); | |
270 | return ret; | |
271 | } | |
272 | ||
ccd979bd MF |
273 | static int ocfs2_readpage(struct file *file, struct page *page) |
274 | { | |
275 | struct inode *inode = page->mapping->host; | |
6798d35a | 276 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
ccd979bd MF |
277 | loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT; |
278 | int ret, unlock = 1; | |
279 | ||
280 | mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0)); | |
281 | ||
e63aecb6 | 282 | ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page); |
ccd979bd MF |
283 | if (ret != 0) { |
284 | if (ret == AOP_TRUNCATED_PAGE) | |
285 | unlock = 0; | |
286 | mlog_errno(ret); | |
287 | goto out; | |
288 | } | |
289 | ||
6798d35a | 290 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { |
e9dfc0b2 | 291 | ret = AOP_TRUNCATED_PAGE; |
e63aecb6 | 292 | goto out_inode_unlock; |
e9dfc0b2 | 293 | } |
ccd979bd MF |
294 | |
295 | /* | |
296 | * i_size might have just been updated as we grabed the meta lock. We | |
297 | * might now be discovering a truncate that hit on another node. | |
298 | * block_read_full_page->get_block freaks out if it is asked to read | |
299 | * beyond the end of a file, so we check here. Callers | |
54cb8821 | 300 | * (generic_file_read, vm_ops->fault) are clever enough to check i_size |
ccd979bd MF |
301 | * and notice that the page they just read isn't needed. |
302 | * | |
303 | * XXX sys_readahead() seems to get that wrong? | |
304 | */ | |
305 | if (start >= i_size_read(inode)) { | |
eebd2aa3 | 306 | zero_user(page, 0, PAGE_SIZE); |
ccd979bd MF |
307 | SetPageUptodate(page); |
308 | ret = 0; | |
309 | goto out_alloc; | |
310 | } | |
311 | ||
6798d35a MF |
312 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
313 | ret = ocfs2_readpage_inline(inode, page); | |
314 | else | |
315 | ret = block_read_full_page(page, ocfs2_get_block); | |
ccd979bd MF |
316 | unlock = 0; |
317 | ||
ccd979bd MF |
318 | out_alloc: |
319 | up_read(&OCFS2_I(inode)->ip_alloc_sem); | |
e63aecb6 MF |
320 | out_inode_unlock: |
321 | ocfs2_inode_unlock(inode, 0); | |
ccd979bd MF |
322 | out: |
323 | if (unlock) | |
324 | unlock_page(page); | |
325 | mlog_exit(ret); | |
326 | return ret; | |
327 | } | |
328 | ||
628a24f5 MF |
329 | /* |
330 | * This is used only for read-ahead. Failures or difficult to handle | |
331 | * situations are safe to ignore. | |
332 | * | |
333 | * Right now, we don't bother with BH_Boundary - in-inode extent lists | |
334 | * are quite large (243 extents on 4k blocks), so most inodes don't | |
335 | * grow out to a tree. If need be, detecting boundary extents could | |
336 | * trivially be added in a future version of ocfs2_get_block(). | |
337 | */ | |
338 | static int ocfs2_readpages(struct file *filp, struct address_space *mapping, | |
339 | struct list_head *pages, unsigned nr_pages) | |
340 | { | |
341 | int ret, err = -EIO; | |
342 | struct inode *inode = mapping->host; | |
343 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
344 | loff_t start; | |
345 | struct page *last; | |
346 | ||
347 | /* | |
348 | * Use the nonblocking flag for the dlm code to avoid page | |
349 | * lock inversion, but don't bother with retrying. | |
350 | */ | |
351 | ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK); | |
352 | if (ret) | |
353 | return err; | |
354 | ||
355 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { | |
356 | ocfs2_inode_unlock(inode, 0); | |
357 | return err; | |
358 | } | |
359 | ||
360 | /* | |
361 | * Don't bother with inline-data. There isn't anything | |
362 | * to read-ahead in that case anyway... | |
363 | */ | |
364 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
365 | goto out_unlock; | |
366 | ||
367 | /* | |
368 | * Check whether a remote node truncated this file - we just | |
369 | * drop out in that case as it's not worth handling here. | |
370 | */ | |
371 | last = list_entry(pages->prev, struct page, lru); | |
372 | start = (loff_t)last->index << PAGE_CACHE_SHIFT; | |
373 | if (start >= i_size_read(inode)) | |
374 | goto out_unlock; | |
375 | ||
376 | err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block); | |
377 | ||
378 | out_unlock: | |
379 | up_read(&oi->ip_alloc_sem); | |
380 | ocfs2_inode_unlock(inode, 0); | |
381 | ||
382 | return err; | |
383 | } | |
384 | ||
ccd979bd MF |
385 | /* Note: Because we don't support holes, our allocation has |
386 | * already happened (allocation writes zeros to the file data) | |
387 | * so we don't have to worry about ordered writes in | |
388 | * ocfs2_writepage. | |
389 | * | |
390 | * ->writepage is called during the process of invalidating the page cache | |
391 | * during blocked lock processing. It can't block on any cluster locks | |
392 | * to during block mapping. It's relying on the fact that the block | |
393 | * mapping can't have disappeared under the dirty pages that it is | |
394 | * being asked to write back. | |
395 | */ | |
396 | static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) | |
397 | { | |
398 | int ret; | |
399 | ||
400 | mlog_entry("(0x%p)\n", page); | |
401 | ||
402 | ret = block_write_full_page(page, ocfs2_get_block, wbc); | |
403 | ||
404 | mlog_exit(ret); | |
405 | ||
406 | return ret; | |
407 | } | |
408 | ||
5069120b MF |
409 | /* |
410 | * This is called from ocfs2_write_zero_page() which has handled it's | |
411 | * own cluster locking and has ensured allocation exists for those | |
412 | * blocks to be written. | |
413 | */ | |
53013cba MF |
414 | int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page, |
415 | unsigned from, unsigned to) | |
416 | { | |
417 | int ret; | |
418 | ||
53013cba MF |
419 | ret = block_prepare_write(page, from, to, ocfs2_get_block); |
420 | ||
53013cba MF |
421 | return ret; |
422 | } | |
423 | ||
ccd979bd MF |
424 | /* Taken from ext3. We don't necessarily need the full blown |
425 | * functionality yet, but IMHO it's better to cut and paste the whole | |
426 | * thing so we can avoid introducing our own bugs (and easily pick up | |
427 | * their fixes when they happen) --Mark */ | |
60b11392 MF |
428 | int walk_page_buffers( handle_t *handle, |
429 | struct buffer_head *head, | |
430 | unsigned from, | |
431 | unsigned to, | |
432 | int *partial, | |
433 | int (*fn)( handle_t *handle, | |
434 | struct buffer_head *bh)) | |
ccd979bd MF |
435 | { |
436 | struct buffer_head *bh; | |
437 | unsigned block_start, block_end; | |
438 | unsigned blocksize = head->b_size; | |
439 | int err, ret = 0; | |
440 | struct buffer_head *next; | |
441 | ||
442 | for ( bh = head, block_start = 0; | |
443 | ret == 0 && (bh != head || !block_start); | |
444 | block_start = block_end, bh = next) | |
445 | { | |
446 | next = bh->b_this_page; | |
447 | block_end = block_start + blocksize; | |
448 | if (block_end <= from || block_start >= to) { | |
449 | if (partial && !buffer_uptodate(bh)) | |
450 | *partial = 1; | |
451 | continue; | |
452 | } | |
453 | err = (*fn)(handle, bh); | |
454 | if (!ret) | |
455 | ret = err; | |
456 | } | |
457 | return ret; | |
458 | } | |
459 | ||
1fabe148 | 460 | handle_t *ocfs2_start_walk_page_trans(struct inode *inode, |
ccd979bd MF |
461 | struct page *page, |
462 | unsigned from, | |
463 | unsigned to) | |
464 | { | |
465 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
58dadcdb | 466 | handle_t *handle; |
ccd979bd MF |
467 | int ret = 0; |
468 | ||
65eff9cc | 469 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
58dadcdb | 470 | if (IS_ERR(handle)) { |
ccd979bd MF |
471 | ret = -ENOMEM; |
472 | mlog_errno(ret); | |
473 | goto out; | |
474 | } | |
475 | ||
476 | if (ocfs2_should_order_data(inode)) { | |
2b4e30fb | 477 | ret = ocfs2_jbd2_file_inode(handle, inode); |
2b4e30fb | 478 | if (ret < 0) |
ccd979bd MF |
479 | mlog_errno(ret); |
480 | } | |
481 | out: | |
482 | if (ret) { | |
58dadcdb | 483 | if (!IS_ERR(handle)) |
02dc1af4 | 484 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
485 | handle = ERR_PTR(ret); |
486 | } | |
487 | return handle; | |
488 | } | |
489 | ||
ccd979bd MF |
490 | static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) |
491 | { | |
492 | sector_t status; | |
493 | u64 p_blkno = 0; | |
494 | int err = 0; | |
495 | struct inode *inode = mapping->host; | |
496 | ||
497 | mlog_entry("(block = %llu)\n", (unsigned long long)block); | |
498 | ||
499 | /* We don't need to lock journal system files, since they aren't | |
500 | * accessed concurrently from multiple nodes. | |
501 | */ | |
502 | if (!INODE_JOURNAL(inode)) { | |
e63aecb6 | 503 | err = ocfs2_inode_lock(inode, NULL, 0); |
ccd979bd MF |
504 | if (err) { |
505 | if (err != -ENOENT) | |
506 | mlog_errno(err); | |
507 | goto bail; | |
508 | } | |
509 | down_read(&OCFS2_I(inode)->ip_alloc_sem); | |
510 | } | |
511 | ||
6798d35a MF |
512 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) |
513 | err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, | |
514 | NULL); | |
ccd979bd MF |
515 | |
516 | if (!INODE_JOURNAL(inode)) { | |
517 | up_read(&OCFS2_I(inode)->ip_alloc_sem); | |
e63aecb6 | 518 | ocfs2_inode_unlock(inode, 0); |
ccd979bd MF |
519 | } |
520 | ||
521 | if (err) { | |
522 | mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", | |
523 | (unsigned long long)block); | |
524 | mlog_errno(err); | |
525 | goto bail; | |
526 | } | |
527 | ||
ccd979bd MF |
528 | bail: |
529 | status = err ? 0 : p_blkno; | |
530 | ||
531 | mlog_exit((int)status); | |
532 | ||
533 | return status; | |
534 | } | |
535 | ||
536 | /* | |
537 | * TODO: Make this into a generic get_blocks function. | |
538 | * | |
539 | * From do_direct_io in direct-io.c: | |
540 | * "So what we do is to permit the ->get_blocks function to populate | |
541 | * bh.b_size with the size of IO which is permitted at this offset and | |
542 | * this i_blkbits." | |
543 | * | |
544 | * This function is called directly from get_more_blocks in direct-io.c. | |
545 | * | |
546 | * called like this: dio->get_blocks(dio->inode, fs_startblk, | |
547 | * fs_count, map_bh, dio->rw == WRITE); | |
548 | */ | |
549 | static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock, | |
ccd979bd MF |
550 | struct buffer_head *bh_result, int create) |
551 | { | |
552 | int ret; | |
4f902c37 | 553 | u64 p_blkno, inode_blocks, contig_blocks; |
49cb8d2d | 554 | unsigned int ext_flags; |
184d7d20 | 555 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
1d8fa7a2 | 556 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
ccd979bd | 557 | |
ccd979bd MF |
558 | /* This function won't even be called if the request isn't all |
559 | * nicely aligned and of the right size, so there's no need | |
560 | * for us to check any of that. */ | |
561 | ||
25baf2da | 562 | inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
564f8a32 MF |
563 | |
564 | /* | |
565 | * Any write past EOF is not allowed because we'd be extending. | |
566 | */ | |
567 | if (create && (iblock + max_blocks) > inode_blocks) { | |
ccd979bd MF |
568 | ret = -EIO; |
569 | goto bail; | |
570 | } | |
ccd979bd MF |
571 | |
572 | /* This figures out the size of the next contiguous block, and | |
573 | * our logical offset */ | |
363041a5 | 574 | ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, |
49cb8d2d | 575 | &contig_blocks, &ext_flags); |
ccd979bd MF |
576 | if (ret) { |
577 | mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", | |
578 | (unsigned long long)iblock); | |
579 | ret = -EIO; | |
580 | goto bail; | |
581 | } | |
582 | ||
0e116227 | 583 | if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)) && !p_blkno && create) { |
25baf2da MF |
584 | ocfs2_error(inode->i_sb, |
585 | "Inode %llu has a hole at block %llu\n", | |
586 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
587 | (unsigned long long)iblock); | |
588 | ret = -EROFS; | |
589 | goto bail; | |
590 | } | |
591 | ||
592 | /* | |
593 | * get_more_blocks() expects us to describe a hole by clearing | |
594 | * the mapped bit on bh_result(). | |
49cb8d2d MF |
595 | * |
596 | * Consider an unwritten extent as a hole. | |
25baf2da | 597 | */ |
49cb8d2d | 598 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
25baf2da MF |
599 | map_bh(bh_result, inode->i_sb, p_blkno); |
600 | else { | |
601 | /* | |
602 | * ocfs2_prepare_inode_for_write() should have caught | |
603 | * the case where we'd be filling a hole and triggered | |
604 | * a buffered write instead. | |
605 | */ | |
606 | if (create) { | |
607 | ret = -EIO; | |
608 | mlog_errno(ret); | |
609 | goto bail; | |
610 | } | |
611 | ||
612 | clear_buffer_mapped(bh_result); | |
613 | } | |
ccd979bd MF |
614 | |
615 | /* make sure we don't map more than max_blocks blocks here as | |
616 | that's all the kernel will handle at this point. */ | |
617 | if (max_blocks < contig_blocks) | |
618 | contig_blocks = max_blocks; | |
619 | bh_result->b_size = contig_blocks << blocksize_bits; | |
620 | bail: | |
621 | return ret; | |
622 | } | |
623 | ||
624 | /* | |
625 | * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're | |
626 | * particularly interested in the aio/dio case. Like the core uses | |
627 | * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from | |
628 | * truncation on another. | |
629 | */ | |
630 | static void ocfs2_dio_end_io(struct kiocb *iocb, | |
631 | loff_t offset, | |
632 | ssize_t bytes, | |
633 | void *private) | |
634 | { | |
d28c9174 | 635 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
7cdfc3a1 | 636 | int level; |
ccd979bd MF |
637 | |
638 | /* this io's submitter should not have unlocked this before we could */ | |
639 | BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); | |
7cdfc3a1 | 640 | |
ccd979bd | 641 | ocfs2_iocb_clear_rw_locked(iocb); |
7cdfc3a1 MF |
642 | |
643 | level = ocfs2_iocb_rw_locked_level(iocb); | |
644 | if (!level) | |
645 | up_read(&inode->i_alloc_sem); | |
646 | ocfs2_rw_unlock(inode, level); | |
ccd979bd MF |
647 | } |
648 | ||
03f981cf JB |
649 | /* |
650 | * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen | |
651 | * from ext3. PageChecked() bits have been removed as OCFS2 does not | |
652 | * do journalled data. | |
653 | */ | |
654 | static void ocfs2_invalidatepage(struct page *page, unsigned long offset) | |
655 | { | |
656 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; | |
657 | ||
2b4e30fb | 658 | jbd2_journal_invalidatepage(journal, page, offset); |
03f981cf JB |
659 | } |
660 | ||
661 | static int ocfs2_releasepage(struct page *page, gfp_t wait) | |
662 | { | |
663 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; | |
664 | ||
665 | if (!page_has_buffers(page)) | |
666 | return 0; | |
2b4e30fb | 667 | return jbd2_journal_try_to_free_buffers(journal, page, wait); |
03f981cf JB |
668 | } |
669 | ||
ccd979bd MF |
670 | static ssize_t ocfs2_direct_IO(int rw, |
671 | struct kiocb *iocb, | |
672 | const struct iovec *iov, | |
673 | loff_t offset, | |
674 | unsigned long nr_segs) | |
675 | { | |
676 | struct file *file = iocb->ki_filp; | |
d28c9174 | 677 | struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; |
ccd979bd MF |
678 | int ret; |
679 | ||
680 | mlog_entry_void(); | |
53013cba | 681 | |
6798d35a MF |
682 | /* |
683 | * Fallback to buffered I/O if we see an inode without | |
684 | * extents. | |
685 | */ | |
686 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
687 | return 0; | |
688 | ||
ccd979bd MF |
689 | ret = blockdev_direct_IO_no_locking(rw, iocb, inode, |
690 | inode->i_sb->s_bdev, iov, offset, | |
691 | nr_segs, | |
692 | ocfs2_direct_IO_get_blocks, | |
693 | ocfs2_dio_end_io); | |
c934a92d | 694 | |
ccd979bd MF |
695 | mlog_exit(ret); |
696 | return ret; | |
697 | } | |
698 | ||
9517bac6 MF |
699 | static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, |
700 | u32 cpos, | |
701 | unsigned int *start, | |
702 | unsigned int *end) | |
703 | { | |
704 | unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE; | |
705 | ||
706 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) { | |
707 | unsigned int cpp; | |
708 | ||
709 | cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits); | |
710 | ||
711 | cluster_start = cpos % cpp; | |
712 | cluster_start = cluster_start << osb->s_clustersize_bits; | |
713 | ||
714 | cluster_end = cluster_start + osb->s_clustersize; | |
715 | } | |
716 | ||
717 | BUG_ON(cluster_start > PAGE_SIZE); | |
718 | BUG_ON(cluster_end > PAGE_SIZE); | |
719 | ||
720 | if (start) | |
721 | *start = cluster_start; | |
722 | if (end) | |
723 | *end = cluster_end; | |
724 | } | |
725 | ||
726 | /* | |
727 | * 'from' and 'to' are the region in the page to avoid zeroing. | |
728 | * | |
729 | * If pagesize > clustersize, this function will avoid zeroing outside | |
730 | * of the cluster boundary. | |
731 | * | |
732 | * from == to == 0 is code for "zero the entire cluster region" | |
733 | */ | |
734 | static void ocfs2_clear_page_regions(struct page *page, | |
735 | struct ocfs2_super *osb, u32 cpos, | |
736 | unsigned from, unsigned to) | |
737 | { | |
738 | void *kaddr; | |
739 | unsigned int cluster_start, cluster_end; | |
740 | ||
741 | ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); | |
742 | ||
743 | kaddr = kmap_atomic(page, KM_USER0); | |
744 | ||
745 | if (from || to) { | |
746 | if (from > cluster_start) | |
747 | memset(kaddr + cluster_start, 0, from - cluster_start); | |
748 | if (to < cluster_end) | |
749 | memset(kaddr + to, 0, cluster_end - to); | |
750 | } else { | |
751 | memset(kaddr + cluster_start, 0, cluster_end - cluster_start); | |
752 | } | |
753 | ||
754 | kunmap_atomic(kaddr, KM_USER0); | |
755 | } | |
756 | ||
4e9563fd MF |
757 | /* |
758 | * Nonsparse file systems fully allocate before we get to the write | |
759 | * code. This prevents ocfs2_write() from tagging the write as an | |
760 | * allocating one, which means ocfs2_map_page_blocks() might try to | |
761 | * read-in the blocks at the tail of our file. Avoid reading them by | |
762 | * testing i_size against each block offset. | |
763 | */ | |
764 | static int ocfs2_should_read_blk(struct inode *inode, struct page *page, | |
765 | unsigned int block_start) | |
766 | { | |
767 | u64 offset = page_offset(page) + block_start; | |
768 | ||
769 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) | |
770 | return 1; | |
771 | ||
772 | if (i_size_read(inode) > offset) | |
773 | return 1; | |
774 | ||
775 | return 0; | |
776 | } | |
777 | ||
9517bac6 MF |
778 | /* |
779 | * Some of this taken from block_prepare_write(). We already have our | |
780 | * mapping by now though, and the entire write will be allocating or | |
781 | * it won't, so not much need to use BH_New. | |
782 | * | |
783 | * This will also skip zeroing, which is handled externally. | |
784 | */ | |
60b11392 MF |
785 | int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, |
786 | struct inode *inode, unsigned int from, | |
787 | unsigned int to, int new) | |
9517bac6 MF |
788 | { |
789 | int ret = 0; | |
790 | struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; | |
791 | unsigned int block_end, block_start; | |
792 | unsigned int bsize = 1 << inode->i_blkbits; | |
793 | ||
794 | if (!page_has_buffers(page)) | |
795 | create_empty_buffers(page, bsize, 0); | |
796 | ||
797 | head = page_buffers(page); | |
798 | for (bh = head, block_start = 0; bh != head || !block_start; | |
799 | bh = bh->b_this_page, block_start += bsize) { | |
800 | block_end = block_start + bsize; | |
801 | ||
3a307ffc MF |
802 | clear_buffer_new(bh); |
803 | ||
9517bac6 MF |
804 | /* |
805 | * Ignore blocks outside of our i/o range - | |
806 | * they may belong to unallocated clusters. | |
807 | */ | |
60b11392 | 808 | if (block_start >= to || block_end <= from) { |
9517bac6 MF |
809 | if (PageUptodate(page)) |
810 | set_buffer_uptodate(bh); | |
811 | continue; | |
812 | } | |
813 | ||
814 | /* | |
815 | * For an allocating write with cluster size >= page | |
816 | * size, we always write the entire page. | |
817 | */ | |
3a307ffc MF |
818 | if (new) |
819 | set_buffer_new(bh); | |
9517bac6 MF |
820 | |
821 | if (!buffer_mapped(bh)) { | |
822 | map_bh(bh, inode->i_sb, *p_blkno); | |
823 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); | |
824 | } | |
825 | ||
826 | if (PageUptodate(page)) { | |
827 | if (!buffer_uptodate(bh)) | |
828 | set_buffer_uptodate(bh); | |
829 | } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && | |
bce99768 | 830 | !buffer_new(bh) && |
4e9563fd | 831 | ocfs2_should_read_blk(inode, page, block_start) && |
bce99768 | 832 | (block_start < from || block_end > to)) { |
9517bac6 MF |
833 | ll_rw_block(READ, 1, &bh); |
834 | *wait_bh++=bh; | |
835 | } | |
836 | ||
837 | *p_blkno = *p_blkno + 1; | |
838 | } | |
839 | ||
840 | /* | |
841 | * If we issued read requests - let them complete. | |
842 | */ | |
843 | while(wait_bh > wait) { | |
844 | wait_on_buffer(*--wait_bh); | |
845 | if (!buffer_uptodate(*wait_bh)) | |
846 | ret = -EIO; | |
847 | } | |
848 | ||
849 | if (ret == 0 || !new) | |
850 | return ret; | |
851 | ||
852 | /* | |
853 | * If we get -EIO above, zero out any newly allocated blocks | |
854 | * to avoid exposing stale data. | |
855 | */ | |
856 | bh = head; | |
857 | block_start = 0; | |
858 | do { | |
9517bac6 MF |
859 | block_end = block_start + bsize; |
860 | if (block_end <= from) | |
861 | goto next_bh; | |
862 | if (block_start >= to) | |
863 | break; | |
864 | ||
eebd2aa3 | 865 | zero_user(page, block_start, bh->b_size); |
9517bac6 MF |
866 | set_buffer_uptodate(bh); |
867 | mark_buffer_dirty(bh); | |
868 | ||
869 | next_bh: | |
870 | block_start = block_end; | |
871 | bh = bh->b_this_page; | |
872 | } while (bh != head); | |
873 | ||
874 | return ret; | |
875 | } | |
876 | ||
3a307ffc MF |
877 | #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE) |
878 | #define OCFS2_MAX_CTXT_PAGES 1 | |
879 | #else | |
880 | #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE) | |
881 | #endif | |
882 | ||
883 | #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE) | |
884 | ||
6af67d82 | 885 | /* |
3a307ffc | 886 | * Describe the state of a single cluster to be written to. |
6af67d82 | 887 | */ |
3a307ffc MF |
888 | struct ocfs2_write_cluster_desc { |
889 | u32 c_cpos; | |
890 | u32 c_phys; | |
891 | /* | |
892 | * Give this a unique field because c_phys eventually gets | |
893 | * filled. | |
894 | */ | |
895 | unsigned c_new; | |
b27b7cbc | 896 | unsigned c_unwritten; |
3a307ffc | 897 | }; |
6af67d82 | 898 | |
b27b7cbc MF |
899 | static inline int ocfs2_should_zero_cluster(struct ocfs2_write_cluster_desc *d) |
900 | { | |
901 | return d->c_new || d->c_unwritten; | |
902 | } | |
903 | ||
3a307ffc MF |
904 | struct ocfs2_write_ctxt { |
905 | /* Logical cluster position / len of write */ | |
906 | u32 w_cpos; | |
907 | u32 w_clen; | |
6af67d82 | 908 | |
3a307ffc | 909 | struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE]; |
6af67d82 | 910 | |
3a307ffc MF |
911 | /* |
912 | * This is true if page_size > cluster_size. | |
913 | * | |
914 | * It triggers a set of special cases during write which might | |
915 | * have to deal with allocating writes to partial pages. | |
916 | */ | |
917 | unsigned int w_large_pages; | |
6af67d82 | 918 | |
3a307ffc MF |
919 | /* |
920 | * Pages involved in this write. | |
921 | * | |
922 | * w_target_page is the page being written to by the user. | |
923 | * | |
924 | * w_pages is an array of pages which always contains | |
925 | * w_target_page, and in the case of an allocating write with | |
926 | * page_size < cluster size, it will contain zero'd and mapped | |
927 | * pages adjacent to w_target_page which need to be written | |
928 | * out in so that future reads from that region will get | |
929 | * zero's. | |
930 | */ | |
931 | struct page *w_pages[OCFS2_MAX_CTXT_PAGES]; | |
932 | unsigned int w_num_pages; | |
933 | struct page *w_target_page; | |
eeb47d12 | 934 | |
3a307ffc MF |
935 | /* |
936 | * ocfs2_write_end() uses this to know what the real range to | |
937 | * write in the target should be. | |
938 | */ | |
939 | unsigned int w_target_from; | |
940 | unsigned int w_target_to; | |
941 | ||
942 | /* | |
943 | * We could use journal_current_handle() but this is cleaner, | |
944 | * IMHO -Mark | |
945 | */ | |
946 | handle_t *w_handle; | |
947 | ||
948 | struct buffer_head *w_di_bh; | |
b27b7cbc MF |
949 | |
950 | struct ocfs2_cached_dealloc_ctxt w_dealloc; | |
3a307ffc MF |
951 | }; |
952 | ||
1d410a6e | 953 | void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages) |
3a307ffc MF |
954 | { |
955 | int i; | |
956 | ||
1d410a6e MF |
957 | for(i = 0; i < num_pages; i++) { |
958 | if (pages[i]) { | |
959 | unlock_page(pages[i]); | |
960 | mark_page_accessed(pages[i]); | |
961 | page_cache_release(pages[i]); | |
962 | } | |
6af67d82 | 963 | } |
1d410a6e MF |
964 | } |
965 | ||
966 | static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc) | |
967 | { | |
968 | ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages); | |
6af67d82 | 969 | |
3a307ffc MF |
970 | brelse(wc->w_di_bh); |
971 | kfree(wc); | |
972 | } | |
973 | ||
974 | static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp, | |
975 | struct ocfs2_super *osb, loff_t pos, | |
607d44aa | 976 | unsigned len, struct buffer_head *di_bh) |
3a307ffc | 977 | { |
30b8548f | 978 | u32 cend; |
3a307ffc MF |
979 | struct ocfs2_write_ctxt *wc; |
980 | ||
981 | wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS); | |
982 | if (!wc) | |
983 | return -ENOMEM; | |
6af67d82 | 984 | |
3a307ffc | 985 | wc->w_cpos = pos >> osb->s_clustersize_bits; |
30b8548f | 986 | cend = (pos + len - 1) >> osb->s_clustersize_bits; |
987 | wc->w_clen = cend - wc->w_cpos + 1; | |
607d44aa MF |
988 | get_bh(di_bh); |
989 | wc->w_di_bh = di_bh; | |
6af67d82 | 990 | |
3a307ffc MF |
991 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) |
992 | wc->w_large_pages = 1; | |
993 | else | |
994 | wc->w_large_pages = 0; | |
995 | ||
b27b7cbc MF |
996 | ocfs2_init_dealloc_ctxt(&wc->w_dealloc); |
997 | ||
3a307ffc | 998 | *wcp = wc; |
6af67d82 | 999 | |
3a307ffc | 1000 | return 0; |
6af67d82 MF |
1001 | } |
1002 | ||
9517bac6 | 1003 | /* |
3a307ffc MF |
1004 | * If a page has any new buffers, zero them out here, and mark them uptodate |
1005 | * and dirty so they'll be written out (in order to prevent uninitialised | |
1006 | * block data from leaking). And clear the new bit. | |
9517bac6 | 1007 | */ |
3a307ffc | 1008 | static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to) |
9517bac6 | 1009 | { |
3a307ffc MF |
1010 | unsigned int block_start, block_end; |
1011 | struct buffer_head *head, *bh; | |
9517bac6 | 1012 | |
3a307ffc MF |
1013 | BUG_ON(!PageLocked(page)); |
1014 | if (!page_has_buffers(page)) | |
1015 | return; | |
9517bac6 | 1016 | |
3a307ffc MF |
1017 | bh = head = page_buffers(page); |
1018 | block_start = 0; | |
1019 | do { | |
1020 | block_end = block_start + bh->b_size; | |
1021 | ||
1022 | if (buffer_new(bh)) { | |
1023 | if (block_end > from && block_start < to) { | |
1024 | if (!PageUptodate(page)) { | |
1025 | unsigned start, end; | |
3a307ffc MF |
1026 | |
1027 | start = max(from, block_start); | |
1028 | end = min(to, block_end); | |
1029 | ||
eebd2aa3 | 1030 | zero_user_segment(page, start, end); |
3a307ffc MF |
1031 | set_buffer_uptodate(bh); |
1032 | } | |
1033 | ||
1034 | clear_buffer_new(bh); | |
1035 | mark_buffer_dirty(bh); | |
1036 | } | |
1037 | } | |
9517bac6 | 1038 | |
3a307ffc MF |
1039 | block_start = block_end; |
1040 | bh = bh->b_this_page; | |
1041 | } while (bh != head); | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * Only called when we have a failure during allocating write to write | |
1046 | * zero's to the newly allocated region. | |
1047 | */ | |
1048 | static void ocfs2_write_failure(struct inode *inode, | |
1049 | struct ocfs2_write_ctxt *wc, | |
1050 | loff_t user_pos, unsigned user_len) | |
1051 | { | |
1052 | int i; | |
5c26a7b7 MF |
1053 | unsigned from = user_pos & (PAGE_CACHE_SIZE - 1), |
1054 | to = user_pos + user_len; | |
3a307ffc MF |
1055 | struct page *tmppage; |
1056 | ||
5c26a7b7 | 1057 | ocfs2_zero_new_buffers(wc->w_target_page, from, to); |
9517bac6 | 1058 | |
3a307ffc MF |
1059 | for(i = 0; i < wc->w_num_pages; i++) { |
1060 | tmppage = wc->w_pages[i]; | |
9517bac6 | 1061 | |
961cecbe | 1062 | if (page_has_buffers(tmppage)) { |
53ef99ca | 1063 | if (ocfs2_should_order_data(inode)) |
2b4e30fb | 1064 | ocfs2_jbd2_file_inode(wc->w_handle, inode); |
961cecbe SM |
1065 | |
1066 | block_commit_write(tmppage, from, to); | |
1067 | } | |
9517bac6 | 1068 | } |
9517bac6 MF |
1069 | } |
1070 | ||
3a307ffc MF |
1071 | static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno, |
1072 | struct ocfs2_write_ctxt *wc, | |
1073 | struct page *page, u32 cpos, | |
1074 | loff_t user_pos, unsigned user_len, | |
1075 | int new) | |
9517bac6 | 1076 | { |
3a307ffc MF |
1077 | int ret; |
1078 | unsigned int map_from = 0, map_to = 0; | |
9517bac6 | 1079 | unsigned int cluster_start, cluster_end; |
3a307ffc | 1080 | unsigned int user_data_from = 0, user_data_to = 0; |
9517bac6 | 1081 | |
3a307ffc | 1082 | ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, |
9517bac6 MF |
1083 | &cluster_start, &cluster_end); |
1084 | ||
3a307ffc MF |
1085 | if (page == wc->w_target_page) { |
1086 | map_from = user_pos & (PAGE_CACHE_SIZE - 1); | |
1087 | map_to = map_from + user_len; | |
1088 | ||
1089 | if (new) | |
1090 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
1091 | cluster_start, cluster_end, | |
1092 | new); | |
1093 | else | |
1094 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
1095 | map_from, map_to, new); | |
1096 | if (ret) { | |
9517bac6 MF |
1097 | mlog_errno(ret); |
1098 | goto out; | |
1099 | } | |
1100 | ||
3a307ffc MF |
1101 | user_data_from = map_from; |
1102 | user_data_to = map_to; | |
9517bac6 | 1103 | if (new) { |
3a307ffc MF |
1104 | map_from = cluster_start; |
1105 | map_to = cluster_end; | |
9517bac6 MF |
1106 | } |
1107 | } else { | |
1108 | /* | |
1109 | * If we haven't allocated the new page yet, we | |
1110 | * shouldn't be writing it out without copying user | |
1111 | * data. This is likely a math error from the caller. | |
1112 | */ | |
1113 | BUG_ON(!new); | |
1114 | ||
3a307ffc MF |
1115 | map_from = cluster_start; |
1116 | map_to = cluster_end; | |
9517bac6 MF |
1117 | |
1118 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
3a307ffc | 1119 | cluster_start, cluster_end, new); |
9517bac6 MF |
1120 | if (ret) { |
1121 | mlog_errno(ret); | |
1122 | goto out; | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | /* | |
1127 | * Parts of newly allocated pages need to be zero'd. | |
1128 | * | |
1129 | * Above, we have also rewritten 'to' and 'from' - as far as | |
1130 | * the rest of the function is concerned, the entire cluster | |
1131 | * range inside of a page needs to be written. | |
1132 | * | |
1133 | * We can skip this if the page is up to date - it's already | |
1134 | * been zero'd from being read in as a hole. | |
1135 | */ | |
1136 | if (new && !PageUptodate(page)) | |
1137 | ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), | |
3a307ffc | 1138 | cpos, user_data_from, user_data_to); |
9517bac6 MF |
1139 | |
1140 | flush_dcache_page(page); | |
1141 | ||
9517bac6 | 1142 | out: |
3a307ffc | 1143 | return ret; |
9517bac6 MF |
1144 | } |
1145 | ||
1146 | /* | |
3a307ffc | 1147 | * This function will only grab one clusters worth of pages. |
9517bac6 | 1148 | */ |
3a307ffc MF |
1149 | static int ocfs2_grab_pages_for_write(struct address_space *mapping, |
1150 | struct ocfs2_write_ctxt *wc, | |
7307de80 MF |
1151 | u32 cpos, loff_t user_pos, int new, |
1152 | struct page *mmap_page) | |
9517bac6 | 1153 | { |
3a307ffc MF |
1154 | int ret = 0, i; |
1155 | unsigned long start, target_index, index; | |
9517bac6 | 1156 | struct inode *inode = mapping->host; |
9517bac6 | 1157 | |
3a307ffc | 1158 | target_index = user_pos >> PAGE_CACHE_SHIFT; |
9517bac6 MF |
1159 | |
1160 | /* | |
1161 | * Figure out how many pages we'll be manipulating here. For | |
60b11392 MF |
1162 | * non allocating write, we just change the one |
1163 | * page. Otherwise, we'll need a whole clusters worth. | |
9517bac6 | 1164 | */ |
9517bac6 | 1165 | if (new) { |
3a307ffc MF |
1166 | wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); |
1167 | start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); | |
9517bac6 | 1168 | } else { |
3a307ffc MF |
1169 | wc->w_num_pages = 1; |
1170 | start = target_index; | |
9517bac6 MF |
1171 | } |
1172 | ||
3a307ffc | 1173 | for(i = 0; i < wc->w_num_pages; i++) { |
9517bac6 MF |
1174 | index = start + i; |
1175 | ||
7307de80 MF |
1176 | if (index == target_index && mmap_page) { |
1177 | /* | |
1178 | * ocfs2_pagemkwrite() is a little different | |
1179 | * and wants us to directly use the page | |
1180 | * passed in. | |
1181 | */ | |
1182 | lock_page(mmap_page); | |
1183 | ||
1184 | if (mmap_page->mapping != mapping) { | |
1185 | unlock_page(mmap_page); | |
1186 | /* | |
1187 | * Sanity check - the locking in | |
1188 | * ocfs2_pagemkwrite() should ensure | |
1189 | * that this code doesn't trigger. | |
1190 | */ | |
1191 | ret = -EINVAL; | |
1192 | mlog_errno(ret); | |
1193 | goto out; | |
1194 | } | |
1195 | ||
1196 | page_cache_get(mmap_page); | |
1197 | wc->w_pages[i] = mmap_page; | |
1198 | } else { | |
1199 | wc->w_pages[i] = find_or_create_page(mapping, index, | |
1200 | GFP_NOFS); | |
1201 | if (!wc->w_pages[i]) { | |
1202 | ret = -ENOMEM; | |
1203 | mlog_errno(ret); | |
1204 | goto out; | |
1205 | } | |
9517bac6 | 1206 | } |
3a307ffc MF |
1207 | |
1208 | if (index == target_index) | |
1209 | wc->w_target_page = wc->w_pages[i]; | |
9517bac6 | 1210 | } |
3a307ffc MF |
1211 | out: |
1212 | return ret; | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Prepare a single cluster for write one cluster into the file. | |
1217 | */ | |
1218 | static int ocfs2_write_cluster(struct address_space *mapping, | |
b27b7cbc MF |
1219 | u32 phys, unsigned int unwritten, |
1220 | struct ocfs2_alloc_context *data_ac, | |
3a307ffc MF |
1221 | struct ocfs2_alloc_context *meta_ac, |
1222 | struct ocfs2_write_ctxt *wc, u32 cpos, | |
1223 | loff_t user_pos, unsigned user_len) | |
1224 | { | |
b27b7cbc | 1225 | int ret, i, new, should_zero = 0; |
3a307ffc MF |
1226 | u64 v_blkno, p_blkno; |
1227 | struct inode *inode = mapping->host; | |
f99b9b7c | 1228 | struct ocfs2_extent_tree et; |
3a307ffc MF |
1229 | |
1230 | new = phys == 0 ? 1 : 0; | |
b27b7cbc MF |
1231 | if (new || unwritten) |
1232 | should_zero = 1; | |
9517bac6 MF |
1233 | |
1234 | if (new) { | |
3a307ffc MF |
1235 | u32 tmp_pos; |
1236 | ||
9517bac6 MF |
1237 | /* |
1238 | * This is safe to call with the page locks - it won't take | |
1239 | * any additional semaphores or cluster locks. | |
1240 | */ | |
3a307ffc | 1241 | tmp_pos = cpos; |
0eb8d47e TM |
1242 | ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode, |
1243 | &tmp_pos, 1, 0, wc->w_di_bh, | |
1244 | wc->w_handle, data_ac, | |
1245 | meta_ac, NULL); | |
9517bac6 MF |
1246 | /* |
1247 | * This shouldn't happen because we must have already | |
1248 | * calculated the correct meta data allocation required. The | |
1249 | * internal tree allocation code should know how to increase | |
1250 | * transaction credits itself. | |
1251 | * | |
1252 | * If need be, we could handle -EAGAIN for a | |
1253 | * RESTART_TRANS here. | |
1254 | */ | |
1255 | mlog_bug_on_msg(ret == -EAGAIN, | |
1256 | "Inode %llu: EAGAIN return during allocation.\n", | |
1257 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1258 | if (ret < 0) { | |
1259 | mlog_errno(ret); | |
1260 | goto out; | |
1261 | } | |
b27b7cbc | 1262 | } else if (unwritten) { |
8d6220d6 | 1263 | ocfs2_init_dinode_extent_tree(&et, inode, wc->w_di_bh); |
f99b9b7c | 1264 | ret = ocfs2_mark_extent_written(inode, &et, |
b27b7cbc | 1265 | wc->w_handle, cpos, 1, phys, |
f99b9b7c | 1266 | meta_ac, &wc->w_dealloc); |
b27b7cbc MF |
1267 | if (ret < 0) { |
1268 | mlog_errno(ret); | |
1269 | goto out; | |
1270 | } | |
1271 | } | |
3a307ffc | 1272 | |
b27b7cbc | 1273 | if (should_zero) |
3a307ffc | 1274 | v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos); |
b27b7cbc | 1275 | else |
3a307ffc | 1276 | v_blkno = user_pos >> inode->i_sb->s_blocksize_bits; |
9517bac6 | 1277 | |
3a307ffc MF |
1278 | /* |
1279 | * The only reason this should fail is due to an inability to | |
1280 | * find the extent added. | |
1281 | */ | |
49cb8d2d MF |
1282 | ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL, |
1283 | NULL); | |
9517bac6 | 1284 | if (ret < 0) { |
3a307ffc MF |
1285 | ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, " |
1286 | "at logical block %llu", | |
1287 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1288 | (unsigned long long)v_blkno); | |
9517bac6 MF |
1289 | goto out; |
1290 | } | |
1291 | ||
1292 | BUG_ON(p_blkno == 0); | |
1293 | ||
3a307ffc MF |
1294 | for(i = 0; i < wc->w_num_pages; i++) { |
1295 | int tmpret; | |
9517bac6 | 1296 | |
3a307ffc MF |
1297 | tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, |
1298 | wc->w_pages[i], cpos, | |
b27b7cbc MF |
1299 | user_pos, user_len, |
1300 | should_zero); | |
3a307ffc MF |
1301 | if (tmpret) { |
1302 | mlog_errno(tmpret); | |
1303 | if (ret == 0) | |
1304 | tmpret = ret; | |
1305 | } | |
9517bac6 MF |
1306 | } |
1307 | ||
3a307ffc MF |
1308 | /* |
1309 | * We only have cleanup to do in case of allocating write. | |
1310 | */ | |
1311 | if (ret && new) | |
1312 | ocfs2_write_failure(inode, wc, user_pos, user_len); | |
1313 | ||
9517bac6 | 1314 | out: |
9517bac6 | 1315 | |
3a307ffc | 1316 | return ret; |
9517bac6 MF |
1317 | } |
1318 | ||
0d172baa MF |
1319 | static int ocfs2_write_cluster_by_desc(struct address_space *mapping, |
1320 | struct ocfs2_alloc_context *data_ac, | |
1321 | struct ocfs2_alloc_context *meta_ac, | |
1322 | struct ocfs2_write_ctxt *wc, | |
1323 | loff_t pos, unsigned len) | |
1324 | { | |
1325 | int ret, i; | |
db56246c MF |
1326 | loff_t cluster_off; |
1327 | unsigned int local_len = len; | |
0d172baa | 1328 | struct ocfs2_write_cluster_desc *desc; |
db56246c | 1329 | struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); |
0d172baa MF |
1330 | |
1331 | for (i = 0; i < wc->w_clen; i++) { | |
1332 | desc = &wc->w_desc[i]; | |
1333 | ||
db56246c MF |
1334 | /* |
1335 | * We have to make sure that the total write passed in | |
1336 | * doesn't extend past a single cluster. | |
1337 | */ | |
1338 | local_len = len; | |
1339 | cluster_off = pos & (osb->s_clustersize - 1); | |
1340 | if ((cluster_off + local_len) > osb->s_clustersize) | |
1341 | local_len = osb->s_clustersize - cluster_off; | |
1342 | ||
b27b7cbc MF |
1343 | ret = ocfs2_write_cluster(mapping, desc->c_phys, |
1344 | desc->c_unwritten, data_ac, meta_ac, | |
db56246c | 1345 | wc, desc->c_cpos, pos, local_len); |
0d172baa MF |
1346 | if (ret) { |
1347 | mlog_errno(ret); | |
1348 | goto out; | |
1349 | } | |
db56246c MF |
1350 | |
1351 | len -= local_len; | |
1352 | pos += local_len; | |
0d172baa MF |
1353 | } |
1354 | ||
1355 | ret = 0; | |
1356 | out: | |
1357 | return ret; | |
1358 | } | |
1359 | ||
3a307ffc MF |
1360 | /* |
1361 | * ocfs2_write_end() wants to know which parts of the target page it | |
1362 | * should complete the write on. It's easiest to compute them ahead of | |
1363 | * time when a more complete view of the write is available. | |
1364 | */ | |
1365 | static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, | |
1366 | struct ocfs2_write_ctxt *wc, | |
1367 | loff_t pos, unsigned len, int alloc) | |
9517bac6 | 1368 | { |
3a307ffc | 1369 | struct ocfs2_write_cluster_desc *desc; |
9517bac6 | 1370 | |
3a307ffc MF |
1371 | wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1); |
1372 | wc->w_target_to = wc->w_target_from + len; | |
1373 | ||
1374 | if (alloc == 0) | |
1375 | return; | |
1376 | ||
1377 | /* | |
1378 | * Allocating write - we may have different boundaries based | |
1379 | * on page size and cluster size. | |
1380 | * | |
1381 | * NOTE: We can no longer compute one value from the other as | |
1382 | * the actual write length and user provided length may be | |
1383 | * different. | |
1384 | */ | |
9517bac6 | 1385 | |
3a307ffc MF |
1386 | if (wc->w_large_pages) { |
1387 | /* | |
1388 | * We only care about the 1st and last cluster within | |
b27b7cbc | 1389 | * our range and whether they should be zero'd or not. Either |
3a307ffc MF |
1390 | * value may be extended out to the start/end of a |
1391 | * newly allocated cluster. | |
1392 | */ | |
1393 | desc = &wc->w_desc[0]; | |
b27b7cbc | 1394 | if (ocfs2_should_zero_cluster(desc)) |
3a307ffc MF |
1395 | ocfs2_figure_cluster_boundaries(osb, |
1396 | desc->c_cpos, | |
1397 | &wc->w_target_from, | |
1398 | NULL); | |
1399 | ||
1400 | desc = &wc->w_desc[wc->w_clen - 1]; | |
b27b7cbc | 1401 | if (ocfs2_should_zero_cluster(desc)) |
3a307ffc MF |
1402 | ocfs2_figure_cluster_boundaries(osb, |
1403 | desc->c_cpos, | |
1404 | NULL, | |
1405 | &wc->w_target_to); | |
1406 | } else { | |
1407 | wc->w_target_from = 0; | |
1408 | wc->w_target_to = PAGE_CACHE_SIZE; | |
1409 | } | |
9517bac6 MF |
1410 | } |
1411 | ||
0d172baa MF |
1412 | /* |
1413 | * Populate each single-cluster write descriptor in the write context | |
1414 | * with information about the i/o to be done. | |
b27b7cbc MF |
1415 | * |
1416 | * Returns the number of clusters that will have to be allocated, as | |
1417 | * well as a worst case estimate of the number of extent records that | |
1418 | * would have to be created during a write to an unwritten region. | |
0d172baa MF |
1419 | */ |
1420 | static int ocfs2_populate_write_desc(struct inode *inode, | |
1421 | struct ocfs2_write_ctxt *wc, | |
b27b7cbc MF |
1422 | unsigned int *clusters_to_alloc, |
1423 | unsigned int *extents_to_split) | |
9517bac6 | 1424 | { |
0d172baa | 1425 | int ret; |
3a307ffc | 1426 | struct ocfs2_write_cluster_desc *desc; |
0d172baa | 1427 | unsigned int num_clusters = 0; |
b27b7cbc | 1428 | unsigned int ext_flags = 0; |
0d172baa MF |
1429 | u32 phys = 0; |
1430 | int i; | |
9517bac6 | 1431 | |
b27b7cbc MF |
1432 | *clusters_to_alloc = 0; |
1433 | *extents_to_split = 0; | |
1434 | ||
3a307ffc MF |
1435 | for (i = 0; i < wc->w_clen; i++) { |
1436 | desc = &wc->w_desc[i]; | |
1437 | desc->c_cpos = wc->w_cpos + i; | |
1438 | ||
1439 | if (num_clusters == 0) { | |
b27b7cbc MF |
1440 | /* |
1441 | * Need to look up the next extent record. | |
1442 | */ | |
3a307ffc | 1443 | ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, |
b27b7cbc | 1444 | &num_clusters, &ext_flags); |
3a307ffc MF |
1445 | if (ret) { |
1446 | mlog_errno(ret); | |
607d44aa | 1447 | goto out; |
3a307ffc | 1448 | } |
b27b7cbc MF |
1449 | |
1450 | /* | |
1451 | * Assume worst case - that we're writing in | |
1452 | * the middle of the extent. | |
1453 | * | |
1454 | * We can assume that the write proceeds from | |
1455 | * left to right, in which case the extent | |
1456 | * insert code is smart enough to coalesce the | |
1457 | * next splits into the previous records created. | |
1458 | */ | |
1459 | if (ext_flags & OCFS2_EXT_UNWRITTEN) | |
1460 | *extents_to_split = *extents_to_split + 2; | |
3a307ffc MF |
1461 | } else if (phys) { |
1462 | /* | |
1463 | * Only increment phys if it doesn't describe | |
1464 | * a hole. | |
1465 | */ | |
1466 | phys++; | |
1467 | } | |
1468 | ||
1469 | desc->c_phys = phys; | |
1470 | if (phys == 0) { | |
1471 | desc->c_new = 1; | |
0d172baa | 1472 | *clusters_to_alloc = *clusters_to_alloc + 1; |
3a307ffc | 1473 | } |
b27b7cbc MF |
1474 | if (ext_flags & OCFS2_EXT_UNWRITTEN) |
1475 | desc->c_unwritten = 1; | |
3a307ffc MF |
1476 | |
1477 | num_clusters--; | |
9517bac6 MF |
1478 | } |
1479 | ||
0d172baa MF |
1480 | ret = 0; |
1481 | out: | |
1482 | return ret; | |
1483 | } | |
1484 | ||
1afc32b9 MF |
1485 | static int ocfs2_write_begin_inline(struct address_space *mapping, |
1486 | struct inode *inode, | |
1487 | struct ocfs2_write_ctxt *wc) | |
1488 | { | |
1489 | int ret; | |
1490 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1491 | struct page *page; | |
1492 | handle_t *handle; | |
1493 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1494 | ||
1495 | page = find_or_create_page(mapping, 0, GFP_NOFS); | |
1496 | if (!page) { | |
1497 | ret = -ENOMEM; | |
1498 | mlog_errno(ret); | |
1499 | goto out; | |
1500 | } | |
1501 | /* | |
1502 | * If we don't set w_num_pages then this page won't get unlocked | |
1503 | * and freed on cleanup of the write context. | |
1504 | */ | |
1505 | wc->w_pages[0] = wc->w_target_page = page; | |
1506 | wc->w_num_pages = 1; | |
1507 | ||
1508 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
1509 | if (IS_ERR(handle)) { | |
1510 | ret = PTR_ERR(handle); | |
1511 | mlog_errno(ret); | |
1512 | goto out; | |
1513 | } | |
1514 | ||
13723d00 JB |
1515 | ret = ocfs2_journal_access_di(handle, inode, wc->w_di_bh, |
1516 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1afc32b9 MF |
1517 | if (ret) { |
1518 | ocfs2_commit_trans(osb, handle); | |
1519 | ||
1520 | mlog_errno(ret); | |
1521 | goto out; | |
1522 | } | |
1523 | ||
1524 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) | |
1525 | ocfs2_set_inode_data_inline(inode, di); | |
1526 | ||
1527 | if (!PageUptodate(page)) { | |
1528 | ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh); | |
1529 | if (ret) { | |
1530 | ocfs2_commit_trans(osb, handle); | |
1531 | ||
1532 | goto out; | |
1533 | } | |
1534 | } | |
1535 | ||
1536 | wc->w_handle = handle; | |
1537 | out: | |
1538 | return ret; | |
1539 | } | |
1540 | ||
1541 | int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size) | |
1542 | { | |
1543 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
1544 | ||
0d8a4e0c | 1545 | if (new_size <= le16_to_cpu(di->id2.i_data.id_count)) |
1afc32b9 MF |
1546 | return 1; |
1547 | return 0; | |
1548 | } | |
1549 | ||
1550 | static int ocfs2_try_to_write_inline_data(struct address_space *mapping, | |
1551 | struct inode *inode, loff_t pos, | |
1552 | unsigned len, struct page *mmap_page, | |
1553 | struct ocfs2_write_ctxt *wc) | |
1554 | { | |
1555 | int ret, written = 0; | |
1556 | loff_t end = pos + len; | |
1557 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1558 | ||
1559 | mlog(0, "Inode %llu, write of %u bytes at off %llu. features: 0x%x\n", | |
1560 | (unsigned long long)oi->ip_blkno, len, (unsigned long long)pos, | |
1561 | oi->ip_dyn_features); | |
1562 | ||
1563 | /* | |
1564 | * Handle inodes which already have inline data 1st. | |
1565 | */ | |
1566 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { | |
1567 | if (mmap_page == NULL && | |
1568 | ocfs2_size_fits_inline_data(wc->w_di_bh, end)) | |
1569 | goto do_inline_write; | |
1570 | ||
1571 | /* | |
1572 | * The write won't fit - we have to give this inode an | |
1573 | * inline extent list now. | |
1574 | */ | |
1575 | ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh); | |
1576 | if (ret) | |
1577 | mlog_errno(ret); | |
1578 | goto out; | |
1579 | } | |
1580 | ||
1581 | /* | |
1582 | * Check whether the inode can accept inline data. | |
1583 | */ | |
1584 | if (oi->ip_clusters != 0 || i_size_read(inode) != 0) | |
1585 | return 0; | |
1586 | ||
1587 | /* | |
1588 | * Check whether the write can fit. | |
1589 | */ | |
1590 | if (mmap_page || end > ocfs2_max_inline_data(inode->i_sb)) | |
1591 | return 0; | |
1592 | ||
1593 | do_inline_write: | |
1594 | ret = ocfs2_write_begin_inline(mapping, inode, wc); | |
1595 | if (ret) { | |
1596 | mlog_errno(ret); | |
1597 | goto out; | |
1598 | } | |
1599 | ||
1600 | /* | |
1601 | * This signals to the caller that the data can be written | |
1602 | * inline. | |
1603 | */ | |
1604 | written = 1; | |
1605 | out: | |
1606 | return written ? written : ret; | |
1607 | } | |
1608 | ||
65ed39d6 MF |
1609 | /* |
1610 | * This function only does anything for file systems which can't | |
1611 | * handle sparse files. | |
1612 | * | |
1613 | * What we want to do here is fill in any hole between the current end | |
1614 | * of allocation and the end of our write. That way the rest of the | |
1615 | * write path can treat it as an non-allocating write, which has no | |
1616 | * special case code for sparse/nonsparse files. | |
1617 | */ | |
1618 | static int ocfs2_expand_nonsparse_inode(struct inode *inode, loff_t pos, | |
1619 | unsigned len, | |
1620 | struct ocfs2_write_ctxt *wc) | |
1621 | { | |
1622 | int ret; | |
1623 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1624 | loff_t newsize = pos + len; | |
1625 | ||
1626 | if (ocfs2_sparse_alloc(osb)) | |
1627 | return 0; | |
1628 | ||
1629 | if (newsize <= i_size_read(inode)) | |
1630 | return 0; | |
1631 | ||
1632 | ret = ocfs2_extend_no_holes(inode, newsize, newsize - len); | |
1633 | if (ret) | |
1634 | mlog_errno(ret); | |
1635 | ||
1636 | return ret; | |
1637 | } | |
1638 | ||
0d172baa MF |
1639 | int ocfs2_write_begin_nolock(struct address_space *mapping, |
1640 | loff_t pos, unsigned len, unsigned flags, | |
1641 | struct page **pagep, void **fsdata, | |
1642 | struct buffer_head *di_bh, struct page *mmap_page) | |
1643 | { | |
1644 | int ret, credits = OCFS2_INODE_UPDATE_CREDITS; | |
b27b7cbc | 1645 | unsigned int clusters_to_alloc, extents_to_split; |
0d172baa MF |
1646 | struct ocfs2_write_ctxt *wc; |
1647 | struct inode *inode = mapping->host; | |
1648 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1649 | struct ocfs2_dinode *di; | |
1650 | struct ocfs2_alloc_context *data_ac = NULL; | |
1651 | struct ocfs2_alloc_context *meta_ac = NULL; | |
1652 | handle_t *handle; | |
f99b9b7c | 1653 | struct ocfs2_extent_tree et; |
0d172baa MF |
1654 | |
1655 | ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh); | |
1656 | if (ret) { | |
1657 | mlog_errno(ret); | |
1658 | return ret; | |
1659 | } | |
1660 | ||
1afc32b9 MF |
1661 | if (ocfs2_supports_inline_data(osb)) { |
1662 | ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len, | |
1663 | mmap_page, wc); | |
1664 | if (ret == 1) { | |
1665 | ret = 0; | |
1666 | goto success; | |
1667 | } | |
1668 | if (ret < 0) { | |
1669 | mlog_errno(ret); | |
1670 | goto out; | |
1671 | } | |
1672 | } | |
1673 | ||
65ed39d6 MF |
1674 | ret = ocfs2_expand_nonsparse_inode(inode, pos, len, wc); |
1675 | if (ret) { | |
1676 | mlog_errno(ret); | |
1677 | goto out; | |
1678 | } | |
1679 | ||
b27b7cbc MF |
1680 | ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc, |
1681 | &extents_to_split); | |
0d172baa MF |
1682 | if (ret) { |
1683 | mlog_errno(ret); | |
1684 | goto out; | |
1685 | } | |
1686 | ||
1687 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1688 | ||
3a307ffc MF |
1689 | /* |
1690 | * We set w_target_from, w_target_to here so that | |
1691 | * ocfs2_write_end() knows which range in the target page to | |
1692 | * write out. An allocation requires that we write the entire | |
1693 | * cluster range. | |
1694 | */ | |
b27b7cbc | 1695 | if (clusters_to_alloc || extents_to_split) { |
3a307ffc MF |
1696 | /* |
1697 | * XXX: We are stretching the limits of | |
b27b7cbc | 1698 | * ocfs2_lock_allocators(). It greatly over-estimates |
3a307ffc MF |
1699 | * the work to be done. |
1700 | */ | |
e7d4cb6b TM |
1701 | mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u," |
1702 | " clusters_to_add = %u, extents_to_split = %u\n", | |
1703 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1704 | (long long)i_size_read(inode), le32_to_cpu(di->i_clusters), | |
1705 | clusters_to_alloc, extents_to_split); | |
1706 | ||
8d6220d6 | 1707 | ocfs2_init_dinode_extent_tree(&et, inode, wc->w_di_bh); |
f99b9b7c | 1708 | ret = ocfs2_lock_allocators(inode, &et, |
231b87d1 | 1709 | clusters_to_alloc, extents_to_split, |
f99b9b7c | 1710 | &data_ac, &meta_ac); |
9517bac6 MF |
1711 | if (ret) { |
1712 | mlog_errno(ret); | |
607d44aa | 1713 | goto out; |
9517bac6 MF |
1714 | } |
1715 | ||
811f933d TM |
1716 | credits = ocfs2_calc_extend_credits(inode->i_sb, |
1717 | &di->id2.i_list, | |
3a307ffc MF |
1718 | clusters_to_alloc); |
1719 | ||
9517bac6 MF |
1720 | } |
1721 | ||
b27b7cbc MF |
1722 | ocfs2_set_target_boundaries(osb, wc, pos, len, |
1723 | clusters_to_alloc + extents_to_split); | |
3a307ffc | 1724 | |
9517bac6 MF |
1725 | handle = ocfs2_start_trans(osb, credits); |
1726 | if (IS_ERR(handle)) { | |
1727 | ret = PTR_ERR(handle); | |
1728 | mlog_errno(ret); | |
607d44aa | 1729 | goto out; |
9517bac6 MF |
1730 | } |
1731 | ||
3a307ffc MF |
1732 | wc->w_handle = handle; |
1733 | ||
a90714c1 JK |
1734 | if (clusters_to_alloc && vfs_dq_alloc_space_nodirty(inode, |
1735 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc))) { | |
1736 | ret = -EDQUOT; | |
1737 | goto out_commit; | |
1738 | } | |
3a307ffc MF |
1739 | /* |
1740 | * We don't want this to fail in ocfs2_write_end(), so do it | |
1741 | * here. | |
1742 | */ | |
13723d00 JB |
1743 | ret = ocfs2_journal_access_di(handle, inode, wc->w_di_bh, |
1744 | OCFS2_JOURNAL_ACCESS_WRITE); | |
3a307ffc | 1745 | if (ret) { |
9517bac6 | 1746 | mlog_errno(ret); |
a90714c1 | 1747 | goto out_quota; |
9517bac6 MF |
1748 | } |
1749 | ||
3a307ffc MF |
1750 | /* |
1751 | * Fill our page array first. That way we've grabbed enough so | |
1752 | * that we can zero and flush if we error after adding the | |
1753 | * extent. | |
1754 | */ | |
1755 | ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, | |
b27b7cbc MF |
1756 | clusters_to_alloc + extents_to_split, |
1757 | mmap_page); | |
9517bac6 MF |
1758 | if (ret) { |
1759 | mlog_errno(ret); | |
a90714c1 | 1760 | goto out_quota; |
9517bac6 MF |
1761 | } |
1762 | ||
0d172baa MF |
1763 | ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos, |
1764 | len); | |
1765 | if (ret) { | |
1766 | mlog_errno(ret); | |
a90714c1 | 1767 | goto out_quota; |
9517bac6 | 1768 | } |
9517bac6 | 1769 | |
3a307ffc MF |
1770 | if (data_ac) |
1771 | ocfs2_free_alloc_context(data_ac); | |
1772 | if (meta_ac) | |
1773 | ocfs2_free_alloc_context(meta_ac); | |
9517bac6 | 1774 | |
1afc32b9 | 1775 | success: |
3a307ffc MF |
1776 | *pagep = wc->w_target_page; |
1777 | *fsdata = wc; | |
1778 | return 0; | |
a90714c1 JK |
1779 | out_quota: |
1780 | if (clusters_to_alloc) | |
1781 | vfs_dq_free_space(inode, | |
1782 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); | |
9517bac6 MF |
1783 | out_commit: |
1784 | ocfs2_commit_trans(osb, handle); | |
1785 | ||
9517bac6 | 1786 | out: |
3a307ffc MF |
1787 | ocfs2_free_write_ctxt(wc); |
1788 | ||
9517bac6 MF |
1789 | if (data_ac) |
1790 | ocfs2_free_alloc_context(data_ac); | |
1791 | if (meta_ac) | |
1792 | ocfs2_free_alloc_context(meta_ac); | |
3a307ffc MF |
1793 | return ret; |
1794 | } | |
1795 | ||
b6af1bcd NP |
1796 | static int ocfs2_write_begin(struct file *file, struct address_space *mapping, |
1797 | loff_t pos, unsigned len, unsigned flags, | |
1798 | struct page **pagep, void **fsdata) | |
607d44aa MF |
1799 | { |
1800 | int ret; | |
1801 | struct buffer_head *di_bh = NULL; | |
1802 | struct inode *inode = mapping->host; | |
1803 | ||
e63aecb6 | 1804 | ret = ocfs2_inode_lock(inode, &di_bh, 1); |
607d44aa MF |
1805 | if (ret) { |
1806 | mlog_errno(ret); | |
1807 | return ret; | |
1808 | } | |
1809 | ||
1810 | /* | |
1811 | * Take alloc sem here to prevent concurrent lookups. That way | |
1812 | * the mapping, zeroing and tree manipulation within | |
1813 | * ocfs2_write() will be safe against ->readpage(). This | |
1814 | * should also serve to lock out allocation from a shared | |
1815 | * writeable region. | |
1816 | */ | |
1817 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1818 | ||
607d44aa | 1819 | ret = ocfs2_write_begin_nolock(mapping, pos, len, flags, pagep, |
7307de80 | 1820 | fsdata, di_bh, NULL); |
607d44aa MF |
1821 | if (ret) { |
1822 | mlog_errno(ret); | |
c934a92d | 1823 | goto out_fail; |
607d44aa MF |
1824 | } |
1825 | ||
1826 | brelse(di_bh); | |
1827 | ||
1828 | return 0; | |
1829 | ||
607d44aa MF |
1830 | out_fail: |
1831 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1832 | ||
1833 | brelse(di_bh); | |
e63aecb6 | 1834 | ocfs2_inode_unlock(inode, 1); |
607d44aa MF |
1835 | |
1836 | return ret; | |
1837 | } | |
1838 | ||
1afc32b9 MF |
1839 | static void ocfs2_write_end_inline(struct inode *inode, loff_t pos, |
1840 | unsigned len, unsigned *copied, | |
1841 | struct ocfs2_dinode *di, | |
1842 | struct ocfs2_write_ctxt *wc) | |
1843 | { | |
1844 | void *kaddr; | |
1845 | ||
1846 | if (unlikely(*copied < len)) { | |
1847 | if (!PageUptodate(wc->w_target_page)) { | |
1848 | *copied = 0; | |
1849 | return; | |
1850 | } | |
1851 | } | |
1852 | ||
1853 | kaddr = kmap_atomic(wc->w_target_page, KM_USER0); | |
1854 | memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied); | |
1855 | kunmap_atomic(kaddr, KM_USER0); | |
1856 | ||
1857 | mlog(0, "Data written to inode at offset %llu. " | |
1858 | "id_count = %u, copied = %u, i_dyn_features = 0x%x\n", | |
1859 | (unsigned long long)pos, *copied, | |
1860 | le16_to_cpu(di->id2.i_data.id_count), | |
1861 | le16_to_cpu(di->i_dyn_features)); | |
1862 | } | |
1863 | ||
7307de80 MF |
1864 | int ocfs2_write_end_nolock(struct address_space *mapping, |
1865 | loff_t pos, unsigned len, unsigned copied, | |
1866 | struct page *page, void *fsdata) | |
3a307ffc MF |
1867 | { |
1868 | int i; | |
1869 | unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1); | |
1870 | struct inode *inode = mapping->host; | |
1871 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1872 | struct ocfs2_write_ctxt *wc = fsdata; | |
1873 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1874 | handle_t *handle = wc->w_handle; | |
1875 | struct page *tmppage; | |
1876 | ||
1afc32b9 MF |
1877 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
1878 | ocfs2_write_end_inline(inode, pos, len, &copied, di, wc); | |
1879 | goto out_write_size; | |
1880 | } | |
1881 | ||
3a307ffc MF |
1882 | if (unlikely(copied < len)) { |
1883 | if (!PageUptodate(wc->w_target_page)) | |
1884 | copied = 0; | |
1885 | ||
1886 | ocfs2_zero_new_buffers(wc->w_target_page, start+copied, | |
1887 | start+len); | |
1888 | } | |
1889 | flush_dcache_page(wc->w_target_page); | |
1890 | ||
1891 | for(i = 0; i < wc->w_num_pages; i++) { | |
1892 | tmppage = wc->w_pages[i]; | |
1893 | ||
1894 | if (tmppage == wc->w_target_page) { | |
1895 | from = wc->w_target_from; | |
1896 | to = wc->w_target_to; | |
1897 | ||
1898 | BUG_ON(from > PAGE_CACHE_SIZE || | |
1899 | to > PAGE_CACHE_SIZE || | |
1900 | to < from); | |
1901 | } else { | |
1902 | /* | |
1903 | * Pages adjacent to the target (if any) imply | |
1904 | * a hole-filling write in which case we want | |
1905 | * to flush their entire range. | |
1906 | */ | |
1907 | from = 0; | |
1908 | to = PAGE_CACHE_SIZE; | |
1909 | } | |
1910 | ||
961cecbe | 1911 | if (page_has_buffers(tmppage)) { |
53ef99ca | 1912 | if (ocfs2_should_order_data(inode)) |
2b4e30fb | 1913 | ocfs2_jbd2_file_inode(wc->w_handle, inode); |
961cecbe SM |
1914 | block_commit_write(tmppage, from, to); |
1915 | } | |
3a307ffc MF |
1916 | } |
1917 | ||
1afc32b9 | 1918 | out_write_size: |
3a307ffc MF |
1919 | pos += copied; |
1920 | if (pos > inode->i_size) { | |
1921 | i_size_write(inode, pos); | |
1922 | mark_inode_dirty(inode); | |
1923 | } | |
1924 | inode->i_blocks = ocfs2_inode_sector_count(inode); | |
1925 | di->i_size = cpu_to_le64((u64)i_size_read(inode)); | |
1926 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
1927 | di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); | |
1928 | di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
3a307ffc MF |
1929 | ocfs2_journal_dirty(handle, wc->w_di_bh); |
1930 | ||
1931 | ocfs2_commit_trans(osb, handle); | |
59a5e416 | 1932 | |
b27b7cbc MF |
1933 | ocfs2_run_deallocs(osb, &wc->w_dealloc); |
1934 | ||
607d44aa MF |
1935 | ocfs2_free_write_ctxt(wc); |
1936 | ||
1937 | return copied; | |
1938 | } | |
1939 | ||
b6af1bcd NP |
1940 | static int ocfs2_write_end(struct file *file, struct address_space *mapping, |
1941 | loff_t pos, unsigned len, unsigned copied, | |
1942 | struct page *page, void *fsdata) | |
607d44aa MF |
1943 | { |
1944 | int ret; | |
1945 | struct inode *inode = mapping->host; | |
1946 | ||
1947 | ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata); | |
1948 | ||
3a307ffc | 1949 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
e63aecb6 | 1950 | ocfs2_inode_unlock(inode, 1); |
9517bac6 | 1951 | |
607d44aa | 1952 | return ret; |
9517bac6 MF |
1953 | } |
1954 | ||
f5e54d6e | 1955 | const struct address_space_operations ocfs2_aops = { |
ccd979bd | 1956 | .readpage = ocfs2_readpage, |
628a24f5 | 1957 | .readpages = ocfs2_readpages, |
ccd979bd | 1958 | .writepage = ocfs2_writepage, |
b6af1bcd NP |
1959 | .write_begin = ocfs2_write_begin, |
1960 | .write_end = ocfs2_write_end, | |
ccd979bd MF |
1961 | .bmap = ocfs2_bmap, |
1962 | .sync_page = block_sync_page, | |
03f981cf JB |
1963 | .direct_IO = ocfs2_direct_IO, |
1964 | .invalidatepage = ocfs2_invalidatepage, | |
1965 | .releasepage = ocfs2_releasepage, | |
1966 | .migratepage = buffer_migrate_page, | |
ccd979bd | 1967 | }; |