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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> |
ccd979bd MF |
30 | |
31 | #define MLOG_MASK_PREFIX ML_FILE_IO | |
32 | #include <cluster/masklog.h> | |
33 | ||
34 | #include "ocfs2.h" | |
35 | ||
36 | #include "alloc.h" | |
37 | #include "aops.h" | |
38 | #include "dlmglue.h" | |
39 | #include "extent_map.h" | |
40 | #include "file.h" | |
41 | #include "inode.h" | |
42 | #include "journal.h" | |
9517bac6 | 43 | #include "suballoc.h" |
ccd979bd MF |
44 | #include "super.h" |
45 | #include "symlink.h" | |
46 | ||
47 | #include "buffer_head_io.h" | |
48 | ||
49 | static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock, | |
50 | struct buffer_head *bh_result, int create) | |
51 | { | |
52 | int err = -EIO; | |
53 | int status; | |
54 | struct ocfs2_dinode *fe = NULL; | |
55 | struct buffer_head *bh = NULL; | |
56 | struct buffer_head *buffer_cache_bh = NULL; | |
57 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
58 | void *kaddr; | |
59 | ||
60 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, | |
61 | (unsigned long long)iblock, bh_result, create); | |
62 | ||
63 | BUG_ON(ocfs2_inode_is_fast_symlink(inode)); | |
64 | ||
65 | if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) { | |
66 | mlog(ML_ERROR, "block offset > PATH_MAX: %llu", | |
67 | (unsigned long long)iblock); | |
68 | goto bail; | |
69 | } | |
70 | ||
71 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), | |
72 | OCFS2_I(inode)->ip_blkno, | |
73 | &bh, OCFS2_BH_CACHED, inode); | |
74 | if (status < 0) { | |
75 | mlog_errno(status); | |
76 | goto bail; | |
77 | } | |
78 | fe = (struct ocfs2_dinode *) bh->b_data; | |
79 | ||
80 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
b0697053 | 81 | mlog(ML_ERROR, "Invalid dinode #%llu: signature = %.*s\n", |
1ca1a111 MF |
82 | (unsigned long long)le64_to_cpu(fe->i_blkno), 7, |
83 | fe->i_signature); | |
ccd979bd MF |
84 | goto bail; |
85 | } | |
86 | ||
87 | if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, | |
88 | le32_to_cpu(fe->i_clusters))) { | |
89 | mlog(ML_ERROR, "block offset is outside the allocated size: " | |
90 | "%llu\n", (unsigned long long)iblock); | |
91 | goto bail; | |
92 | } | |
93 | ||
94 | /* We don't use the page cache to create symlink data, so if | |
95 | * need be, copy it over from the buffer cache. */ | |
96 | if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { | |
97 | u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + | |
98 | iblock; | |
99 | buffer_cache_bh = sb_getblk(osb->sb, blkno); | |
100 | if (!buffer_cache_bh) { | |
101 | mlog(ML_ERROR, "couldn't getblock for symlink!\n"); | |
102 | goto bail; | |
103 | } | |
104 | ||
105 | /* we haven't locked out transactions, so a commit | |
106 | * could've happened. Since we've got a reference on | |
107 | * the bh, even if it commits while we're doing the | |
108 | * copy, the data is still good. */ | |
109 | if (buffer_jbd(buffer_cache_bh) | |
110 | && ocfs2_inode_is_new(inode)) { | |
111 | kaddr = kmap_atomic(bh_result->b_page, KM_USER0); | |
112 | if (!kaddr) { | |
113 | mlog(ML_ERROR, "couldn't kmap!\n"); | |
114 | goto bail; | |
115 | } | |
116 | memcpy(kaddr + (bh_result->b_size * iblock), | |
117 | buffer_cache_bh->b_data, | |
118 | bh_result->b_size); | |
119 | kunmap_atomic(kaddr, KM_USER0); | |
120 | set_buffer_uptodate(bh_result); | |
121 | } | |
122 | brelse(buffer_cache_bh); | |
123 | } | |
124 | ||
125 | map_bh(bh_result, inode->i_sb, | |
126 | le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); | |
127 | ||
128 | err = 0; | |
129 | ||
130 | bail: | |
131 | if (bh) | |
132 | brelse(bh); | |
133 | ||
134 | mlog_exit(err); | |
135 | return err; | |
136 | } | |
137 | ||
138 | static int ocfs2_get_block(struct inode *inode, sector_t iblock, | |
139 | struct buffer_head *bh_result, int create) | |
140 | { | |
141 | int err = 0; | |
49cb8d2d | 142 | unsigned int ext_flags; |
628a24f5 MF |
143 | u64 max_blocks = bh_result->b_size >> inode->i_blkbits; |
144 | u64 p_blkno, count, past_eof; | |
25baf2da | 145 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
146 | |
147 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, | |
148 | (unsigned long long)iblock, bh_result, create); | |
149 | ||
150 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) | |
151 | mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", | |
152 | inode, inode->i_ino); | |
153 | ||
154 | if (S_ISLNK(inode->i_mode)) { | |
155 | /* this always does I/O for some reason. */ | |
156 | err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); | |
157 | goto bail; | |
158 | } | |
159 | ||
628a24f5 | 160 | err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count, |
49cb8d2d | 161 | &ext_flags); |
ccd979bd MF |
162 | if (err) { |
163 | mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " | |
b0697053 MF |
164 | "%llu, NULL)\n", err, inode, (unsigned long long)iblock, |
165 | (unsigned long long)p_blkno); | |
ccd979bd MF |
166 | goto bail; |
167 | } | |
168 | ||
628a24f5 MF |
169 | if (max_blocks < count) |
170 | count = max_blocks; | |
171 | ||
25baf2da MF |
172 | /* |
173 | * ocfs2 never allocates in this function - the only time we | |
174 | * need to use BH_New is when we're extending i_size on a file | |
175 | * system which doesn't support holes, in which case BH_New | |
176 | * allows block_prepare_write() to zero. | |
177 | */ | |
178 | mlog_bug_on_msg(create && p_blkno == 0 && ocfs2_sparse_alloc(osb), | |
179 | "ino %lu, iblock %llu\n", inode->i_ino, | |
180 | (unsigned long long)iblock); | |
181 | ||
49cb8d2d MF |
182 | /* Treat the unwritten extent as a hole for zeroing purposes. */ |
183 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) | |
25baf2da MF |
184 | map_bh(bh_result, inode->i_sb, p_blkno); |
185 | ||
628a24f5 MF |
186 | bh_result->b_size = count << inode->i_blkbits; |
187 | ||
25baf2da MF |
188 | if (!ocfs2_sparse_alloc(osb)) { |
189 | if (p_blkno == 0) { | |
190 | err = -EIO; | |
191 | mlog(ML_ERROR, | |
192 | "iblock = %llu p_blkno = %llu blkno=(%llu)\n", | |
193 | (unsigned long long)iblock, | |
194 | (unsigned long long)p_blkno, | |
195 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
196 | mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); | |
197 | dump_stack(); | |
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 || | |
232 | size > ocfs2_max_inline_data(inode->i_sb)) { | |
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; | |
257 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
258 | ||
259 | BUG_ON(!PageLocked(page)); | |
260 | BUG_ON(!OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL); | |
261 | ||
262 | ret = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &di_bh, | |
263 | OCFS2_BH_CACHED, inode); | |
264 | if (ret) { | |
265 | mlog_errno(ret); | |
266 | goto out; | |
267 | } | |
268 | ||
269 | ret = ocfs2_read_inline_data(inode, page, di_bh); | |
270 | out: | |
271 | unlock_page(page); | |
272 | ||
273 | brelse(di_bh); | |
274 | return ret; | |
275 | } | |
276 | ||
ccd979bd MF |
277 | static int ocfs2_readpage(struct file *file, struct page *page) |
278 | { | |
279 | struct inode *inode = page->mapping->host; | |
6798d35a | 280 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
ccd979bd MF |
281 | loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT; |
282 | int ret, unlock = 1; | |
283 | ||
284 | mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0)); | |
285 | ||
e63aecb6 | 286 | ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page); |
ccd979bd MF |
287 | if (ret != 0) { |
288 | if (ret == AOP_TRUNCATED_PAGE) | |
289 | unlock = 0; | |
290 | mlog_errno(ret); | |
291 | goto out; | |
292 | } | |
293 | ||
6798d35a | 294 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { |
e9dfc0b2 | 295 | ret = AOP_TRUNCATED_PAGE; |
e63aecb6 | 296 | goto out_inode_unlock; |
e9dfc0b2 | 297 | } |
ccd979bd MF |
298 | |
299 | /* | |
300 | * i_size might have just been updated as we grabed the meta lock. We | |
301 | * might now be discovering a truncate that hit on another node. | |
302 | * block_read_full_page->get_block freaks out if it is asked to read | |
303 | * beyond the end of a file, so we check here. Callers | |
54cb8821 | 304 | * (generic_file_read, vm_ops->fault) are clever enough to check i_size |
ccd979bd MF |
305 | * and notice that the page they just read isn't needed. |
306 | * | |
307 | * XXX sys_readahead() seems to get that wrong? | |
308 | */ | |
309 | if (start >= i_size_read(inode)) { | |
5c3c6bb7 | 310 | zero_user_page(page, 0, PAGE_SIZE, KM_USER0); |
ccd979bd MF |
311 | SetPageUptodate(page); |
312 | ret = 0; | |
313 | goto out_alloc; | |
314 | } | |
315 | ||
6798d35a MF |
316 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
317 | ret = ocfs2_readpage_inline(inode, page); | |
318 | else | |
319 | ret = block_read_full_page(page, ocfs2_get_block); | |
ccd979bd MF |
320 | unlock = 0; |
321 | ||
ccd979bd MF |
322 | out_alloc: |
323 | up_read(&OCFS2_I(inode)->ip_alloc_sem); | |
e63aecb6 MF |
324 | out_inode_unlock: |
325 | ocfs2_inode_unlock(inode, 0); | |
ccd979bd MF |
326 | out: |
327 | if (unlock) | |
328 | unlock_page(page); | |
329 | mlog_exit(ret); | |
330 | return ret; | |
331 | } | |
332 | ||
628a24f5 MF |
333 | /* |
334 | * This is used only for read-ahead. Failures or difficult to handle | |
335 | * situations are safe to ignore. | |
336 | * | |
337 | * Right now, we don't bother with BH_Boundary - in-inode extent lists | |
338 | * are quite large (243 extents on 4k blocks), so most inodes don't | |
339 | * grow out to a tree. If need be, detecting boundary extents could | |
340 | * trivially be added in a future version of ocfs2_get_block(). | |
341 | */ | |
342 | static int ocfs2_readpages(struct file *filp, struct address_space *mapping, | |
343 | struct list_head *pages, unsigned nr_pages) | |
344 | { | |
345 | int ret, err = -EIO; | |
346 | struct inode *inode = mapping->host; | |
347 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
348 | loff_t start; | |
349 | struct page *last; | |
350 | ||
351 | /* | |
352 | * Use the nonblocking flag for the dlm code to avoid page | |
353 | * lock inversion, but don't bother with retrying. | |
354 | */ | |
355 | ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK); | |
356 | if (ret) | |
357 | return err; | |
358 | ||
359 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { | |
360 | ocfs2_inode_unlock(inode, 0); | |
361 | return err; | |
362 | } | |
363 | ||
364 | /* | |
365 | * Don't bother with inline-data. There isn't anything | |
366 | * to read-ahead in that case anyway... | |
367 | */ | |
368 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
369 | goto out_unlock; | |
370 | ||
371 | /* | |
372 | * Check whether a remote node truncated this file - we just | |
373 | * drop out in that case as it's not worth handling here. | |
374 | */ | |
375 | last = list_entry(pages->prev, struct page, lru); | |
376 | start = (loff_t)last->index << PAGE_CACHE_SHIFT; | |
377 | if (start >= i_size_read(inode)) | |
378 | goto out_unlock; | |
379 | ||
380 | err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block); | |
381 | ||
382 | out_unlock: | |
383 | up_read(&oi->ip_alloc_sem); | |
384 | ocfs2_inode_unlock(inode, 0); | |
385 | ||
386 | return err; | |
387 | } | |
388 | ||
ccd979bd MF |
389 | /* Note: Because we don't support holes, our allocation has |
390 | * already happened (allocation writes zeros to the file data) | |
391 | * so we don't have to worry about ordered writes in | |
392 | * ocfs2_writepage. | |
393 | * | |
394 | * ->writepage is called during the process of invalidating the page cache | |
395 | * during blocked lock processing. It can't block on any cluster locks | |
396 | * to during block mapping. It's relying on the fact that the block | |
397 | * mapping can't have disappeared under the dirty pages that it is | |
398 | * being asked to write back. | |
399 | */ | |
400 | static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) | |
401 | { | |
402 | int ret; | |
403 | ||
404 | mlog_entry("(0x%p)\n", page); | |
405 | ||
406 | ret = block_write_full_page(page, ocfs2_get_block, wbc); | |
407 | ||
408 | mlog_exit(ret); | |
409 | ||
410 | return ret; | |
411 | } | |
412 | ||
5069120b MF |
413 | /* |
414 | * This is called from ocfs2_write_zero_page() which has handled it's | |
415 | * own cluster locking and has ensured allocation exists for those | |
416 | * blocks to be written. | |
417 | */ | |
53013cba MF |
418 | int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page, |
419 | unsigned from, unsigned to) | |
420 | { | |
421 | int ret; | |
422 | ||
53013cba MF |
423 | ret = block_prepare_write(page, from, to, ocfs2_get_block); |
424 | ||
53013cba MF |
425 | return ret; |
426 | } | |
427 | ||
ccd979bd MF |
428 | /* Taken from ext3. We don't necessarily need the full blown |
429 | * functionality yet, but IMHO it's better to cut and paste the whole | |
430 | * thing so we can avoid introducing our own bugs (and easily pick up | |
431 | * their fixes when they happen) --Mark */ | |
60b11392 MF |
432 | int walk_page_buffers( handle_t *handle, |
433 | struct buffer_head *head, | |
434 | unsigned from, | |
435 | unsigned to, | |
436 | int *partial, | |
437 | int (*fn)( handle_t *handle, | |
438 | struct buffer_head *bh)) | |
ccd979bd MF |
439 | { |
440 | struct buffer_head *bh; | |
441 | unsigned block_start, block_end; | |
442 | unsigned blocksize = head->b_size; | |
443 | int err, ret = 0; | |
444 | struct buffer_head *next; | |
445 | ||
446 | for ( bh = head, block_start = 0; | |
447 | ret == 0 && (bh != head || !block_start); | |
448 | block_start = block_end, bh = next) | |
449 | { | |
450 | next = bh->b_this_page; | |
451 | block_end = block_start + blocksize; | |
452 | if (block_end <= from || block_start >= to) { | |
453 | if (partial && !buffer_uptodate(bh)) | |
454 | *partial = 1; | |
455 | continue; | |
456 | } | |
457 | err = (*fn)(handle, bh); | |
458 | if (!ret) | |
459 | ret = err; | |
460 | } | |
461 | return ret; | |
462 | } | |
463 | ||
1fabe148 | 464 | handle_t *ocfs2_start_walk_page_trans(struct inode *inode, |
ccd979bd MF |
465 | struct page *page, |
466 | unsigned from, | |
467 | unsigned to) | |
468 | { | |
469 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1fabe148 | 470 | handle_t *handle = NULL; |
ccd979bd MF |
471 | int ret = 0; |
472 | ||
65eff9cc | 473 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
ccd979bd MF |
474 | if (!handle) { |
475 | ret = -ENOMEM; | |
476 | mlog_errno(ret); | |
477 | goto out; | |
478 | } | |
479 | ||
480 | if (ocfs2_should_order_data(inode)) { | |
1fabe148 | 481 | ret = walk_page_buffers(handle, |
ccd979bd MF |
482 | page_buffers(page), |
483 | from, to, NULL, | |
484 | ocfs2_journal_dirty_data); | |
485 | if (ret < 0) | |
486 | mlog_errno(ret); | |
487 | } | |
488 | out: | |
489 | if (ret) { | |
490 | if (handle) | |
02dc1af4 | 491 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
492 | handle = ERR_PTR(ret); |
493 | } | |
494 | return handle; | |
495 | } | |
496 | ||
ccd979bd MF |
497 | static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) |
498 | { | |
499 | sector_t status; | |
500 | u64 p_blkno = 0; | |
501 | int err = 0; | |
502 | struct inode *inode = mapping->host; | |
503 | ||
504 | mlog_entry("(block = %llu)\n", (unsigned long long)block); | |
505 | ||
506 | /* We don't need to lock journal system files, since they aren't | |
507 | * accessed concurrently from multiple nodes. | |
508 | */ | |
509 | if (!INODE_JOURNAL(inode)) { | |
e63aecb6 | 510 | err = ocfs2_inode_lock(inode, NULL, 0); |
ccd979bd MF |
511 | if (err) { |
512 | if (err != -ENOENT) | |
513 | mlog_errno(err); | |
514 | goto bail; | |
515 | } | |
516 | down_read(&OCFS2_I(inode)->ip_alloc_sem); | |
517 | } | |
518 | ||
6798d35a MF |
519 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) |
520 | err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, | |
521 | NULL); | |
ccd979bd MF |
522 | |
523 | if (!INODE_JOURNAL(inode)) { | |
524 | up_read(&OCFS2_I(inode)->ip_alloc_sem); | |
e63aecb6 | 525 | ocfs2_inode_unlock(inode, 0); |
ccd979bd MF |
526 | } |
527 | ||
528 | if (err) { | |
529 | mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", | |
530 | (unsigned long long)block); | |
531 | mlog_errno(err); | |
532 | goto bail; | |
533 | } | |
534 | ||
ccd979bd MF |
535 | bail: |
536 | status = err ? 0 : p_blkno; | |
537 | ||
538 | mlog_exit((int)status); | |
539 | ||
540 | return status; | |
541 | } | |
542 | ||
543 | /* | |
544 | * TODO: Make this into a generic get_blocks function. | |
545 | * | |
546 | * From do_direct_io in direct-io.c: | |
547 | * "So what we do is to permit the ->get_blocks function to populate | |
548 | * bh.b_size with the size of IO which is permitted at this offset and | |
549 | * this i_blkbits." | |
550 | * | |
551 | * This function is called directly from get_more_blocks in direct-io.c. | |
552 | * | |
553 | * called like this: dio->get_blocks(dio->inode, fs_startblk, | |
554 | * fs_count, map_bh, dio->rw == WRITE); | |
555 | */ | |
556 | static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock, | |
ccd979bd MF |
557 | struct buffer_head *bh_result, int create) |
558 | { | |
559 | int ret; | |
4f902c37 | 560 | u64 p_blkno, inode_blocks, contig_blocks; |
49cb8d2d | 561 | unsigned int ext_flags; |
184d7d20 | 562 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
1d8fa7a2 | 563 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
ccd979bd | 564 | |
ccd979bd MF |
565 | /* This function won't even be called if the request isn't all |
566 | * nicely aligned and of the right size, so there's no need | |
567 | * for us to check any of that. */ | |
568 | ||
25baf2da | 569 | inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
564f8a32 MF |
570 | |
571 | /* | |
572 | * Any write past EOF is not allowed because we'd be extending. | |
573 | */ | |
574 | if (create && (iblock + max_blocks) > inode_blocks) { | |
ccd979bd MF |
575 | ret = -EIO; |
576 | goto bail; | |
577 | } | |
ccd979bd MF |
578 | |
579 | /* This figures out the size of the next contiguous block, and | |
580 | * our logical offset */ | |
363041a5 | 581 | ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, |
49cb8d2d | 582 | &contig_blocks, &ext_flags); |
ccd979bd MF |
583 | if (ret) { |
584 | mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", | |
585 | (unsigned long long)iblock); | |
586 | ret = -EIO; | |
587 | goto bail; | |
588 | } | |
589 | ||
25baf2da MF |
590 | if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)) && !p_blkno) { |
591 | ocfs2_error(inode->i_sb, | |
592 | "Inode %llu has a hole at block %llu\n", | |
593 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
594 | (unsigned long long)iblock); | |
595 | ret = -EROFS; | |
596 | goto bail; | |
597 | } | |
598 | ||
599 | /* | |
600 | * get_more_blocks() expects us to describe a hole by clearing | |
601 | * the mapped bit on bh_result(). | |
49cb8d2d MF |
602 | * |
603 | * Consider an unwritten extent as a hole. | |
25baf2da | 604 | */ |
49cb8d2d | 605 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
25baf2da MF |
606 | map_bh(bh_result, inode->i_sb, p_blkno); |
607 | else { | |
608 | /* | |
609 | * ocfs2_prepare_inode_for_write() should have caught | |
610 | * the case where we'd be filling a hole and triggered | |
611 | * a buffered write instead. | |
612 | */ | |
613 | if (create) { | |
614 | ret = -EIO; | |
615 | mlog_errno(ret); | |
616 | goto bail; | |
617 | } | |
618 | ||
619 | clear_buffer_mapped(bh_result); | |
620 | } | |
ccd979bd MF |
621 | |
622 | /* make sure we don't map more than max_blocks blocks here as | |
623 | that's all the kernel will handle at this point. */ | |
624 | if (max_blocks < contig_blocks) | |
625 | contig_blocks = max_blocks; | |
626 | bh_result->b_size = contig_blocks << blocksize_bits; | |
627 | bail: | |
628 | return ret; | |
629 | } | |
630 | ||
631 | /* | |
632 | * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're | |
633 | * particularly interested in the aio/dio case. Like the core uses | |
634 | * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from | |
635 | * truncation on another. | |
636 | */ | |
637 | static void ocfs2_dio_end_io(struct kiocb *iocb, | |
638 | loff_t offset, | |
639 | ssize_t bytes, | |
640 | void *private) | |
641 | { | |
d28c9174 | 642 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
7cdfc3a1 | 643 | int level; |
ccd979bd MF |
644 | |
645 | /* this io's submitter should not have unlocked this before we could */ | |
646 | BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); | |
7cdfc3a1 | 647 | |
ccd979bd | 648 | ocfs2_iocb_clear_rw_locked(iocb); |
7cdfc3a1 MF |
649 | |
650 | level = ocfs2_iocb_rw_locked_level(iocb); | |
651 | if (!level) | |
652 | up_read(&inode->i_alloc_sem); | |
653 | ocfs2_rw_unlock(inode, level); | |
ccd979bd MF |
654 | } |
655 | ||
03f981cf JB |
656 | /* |
657 | * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen | |
658 | * from ext3. PageChecked() bits have been removed as OCFS2 does not | |
659 | * do journalled data. | |
660 | */ | |
661 | static void ocfs2_invalidatepage(struct page *page, unsigned long offset) | |
662 | { | |
663 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; | |
664 | ||
665 | journal_invalidatepage(journal, page, offset); | |
666 | } | |
667 | ||
668 | static int ocfs2_releasepage(struct page *page, gfp_t wait) | |
669 | { | |
670 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; | |
671 | ||
672 | if (!page_has_buffers(page)) | |
673 | return 0; | |
674 | return journal_try_to_free_buffers(journal, page, wait); | |
675 | } | |
676 | ||
ccd979bd MF |
677 | static ssize_t ocfs2_direct_IO(int rw, |
678 | struct kiocb *iocb, | |
679 | const struct iovec *iov, | |
680 | loff_t offset, | |
681 | unsigned long nr_segs) | |
682 | { | |
683 | struct file *file = iocb->ki_filp; | |
d28c9174 | 684 | struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; |
ccd979bd MF |
685 | int ret; |
686 | ||
687 | mlog_entry_void(); | |
53013cba | 688 | |
6798d35a MF |
689 | /* |
690 | * Fallback to buffered I/O if we see an inode without | |
691 | * extents. | |
692 | */ | |
693 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
694 | return 0; | |
695 | ||
ccd979bd MF |
696 | ret = blockdev_direct_IO_no_locking(rw, iocb, inode, |
697 | inode->i_sb->s_bdev, iov, offset, | |
698 | nr_segs, | |
699 | ocfs2_direct_IO_get_blocks, | |
700 | ocfs2_dio_end_io); | |
c934a92d | 701 | |
ccd979bd MF |
702 | mlog_exit(ret); |
703 | return ret; | |
704 | } | |
705 | ||
9517bac6 MF |
706 | static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, |
707 | u32 cpos, | |
708 | unsigned int *start, | |
709 | unsigned int *end) | |
710 | { | |
711 | unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE; | |
712 | ||
713 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) { | |
714 | unsigned int cpp; | |
715 | ||
716 | cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits); | |
717 | ||
718 | cluster_start = cpos % cpp; | |
719 | cluster_start = cluster_start << osb->s_clustersize_bits; | |
720 | ||
721 | cluster_end = cluster_start + osb->s_clustersize; | |
722 | } | |
723 | ||
724 | BUG_ON(cluster_start > PAGE_SIZE); | |
725 | BUG_ON(cluster_end > PAGE_SIZE); | |
726 | ||
727 | if (start) | |
728 | *start = cluster_start; | |
729 | if (end) | |
730 | *end = cluster_end; | |
731 | } | |
732 | ||
733 | /* | |
734 | * 'from' and 'to' are the region in the page to avoid zeroing. | |
735 | * | |
736 | * If pagesize > clustersize, this function will avoid zeroing outside | |
737 | * of the cluster boundary. | |
738 | * | |
739 | * from == to == 0 is code for "zero the entire cluster region" | |
740 | */ | |
741 | static void ocfs2_clear_page_regions(struct page *page, | |
742 | struct ocfs2_super *osb, u32 cpos, | |
743 | unsigned from, unsigned to) | |
744 | { | |
745 | void *kaddr; | |
746 | unsigned int cluster_start, cluster_end; | |
747 | ||
748 | ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); | |
749 | ||
750 | kaddr = kmap_atomic(page, KM_USER0); | |
751 | ||
752 | if (from || to) { | |
753 | if (from > cluster_start) | |
754 | memset(kaddr + cluster_start, 0, from - cluster_start); | |
755 | if (to < cluster_end) | |
756 | memset(kaddr + to, 0, cluster_end - to); | |
757 | } else { | |
758 | memset(kaddr + cluster_start, 0, cluster_end - cluster_start); | |
759 | } | |
760 | ||
761 | kunmap_atomic(kaddr, KM_USER0); | |
762 | } | |
763 | ||
4e9563fd MF |
764 | /* |
765 | * Nonsparse file systems fully allocate before we get to the write | |
766 | * code. This prevents ocfs2_write() from tagging the write as an | |
767 | * allocating one, which means ocfs2_map_page_blocks() might try to | |
768 | * read-in the blocks at the tail of our file. Avoid reading them by | |
769 | * testing i_size against each block offset. | |
770 | */ | |
771 | static int ocfs2_should_read_blk(struct inode *inode, struct page *page, | |
772 | unsigned int block_start) | |
773 | { | |
774 | u64 offset = page_offset(page) + block_start; | |
775 | ||
776 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) | |
777 | return 1; | |
778 | ||
779 | if (i_size_read(inode) > offset) | |
780 | return 1; | |
781 | ||
782 | return 0; | |
783 | } | |
784 | ||
9517bac6 MF |
785 | /* |
786 | * Some of this taken from block_prepare_write(). We already have our | |
787 | * mapping by now though, and the entire write will be allocating or | |
788 | * it won't, so not much need to use BH_New. | |
789 | * | |
790 | * This will also skip zeroing, which is handled externally. | |
791 | */ | |
60b11392 MF |
792 | int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, |
793 | struct inode *inode, unsigned int from, | |
794 | unsigned int to, int new) | |
9517bac6 MF |
795 | { |
796 | int ret = 0; | |
797 | struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; | |
798 | unsigned int block_end, block_start; | |
799 | unsigned int bsize = 1 << inode->i_blkbits; | |
800 | ||
801 | if (!page_has_buffers(page)) | |
802 | create_empty_buffers(page, bsize, 0); | |
803 | ||
804 | head = page_buffers(page); | |
805 | for (bh = head, block_start = 0; bh != head || !block_start; | |
806 | bh = bh->b_this_page, block_start += bsize) { | |
807 | block_end = block_start + bsize; | |
808 | ||
3a307ffc MF |
809 | clear_buffer_new(bh); |
810 | ||
9517bac6 MF |
811 | /* |
812 | * Ignore blocks outside of our i/o range - | |
813 | * they may belong to unallocated clusters. | |
814 | */ | |
60b11392 | 815 | if (block_start >= to || block_end <= from) { |
9517bac6 MF |
816 | if (PageUptodate(page)) |
817 | set_buffer_uptodate(bh); | |
818 | continue; | |
819 | } | |
820 | ||
821 | /* | |
822 | * For an allocating write with cluster size >= page | |
823 | * size, we always write the entire page. | |
824 | */ | |
3a307ffc MF |
825 | if (new) |
826 | set_buffer_new(bh); | |
9517bac6 MF |
827 | |
828 | if (!buffer_mapped(bh)) { | |
829 | map_bh(bh, inode->i_sb, *p_blkno); | |
830 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); | |
831 | } | |
832 | ||
833 | if (PageUptodate(page)) { | |
834 | if (!buffer_uptodate(bh)) | |
835 | set_buffer_uptodate(bh); | |
836 | } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && | |
bce99768 | 837 | !buffer_new(bh) && |
4e9563fd | 838 | ocfs2_should_read_blk(inode, page, block_start) && |
bce99768 | 839 | (block_start < from || block_end > to)) { |
9517bac6 MF |
840 | ll_rw_block(READ, 1, &bh); |
841 | *wait_bh++=bh; | |
842 | } | |
843 | ||
844 | *p_blkno = *p_blkno + 1; | |
845 | } | |
846 | ||
847 | /* | |
848 | * If we issued read requests - let them complete. | |
849 | */ | |
850 | while(wait_bh > wait) { | |
851 | wait_on_buffer(*--wait_bh); | |
852 | if (!buffer_uptodate(*wait_bh)) | |
853 | ret = -EIO; | |
854 | } | |
855 | ||
856 | if (ret == 0 || !new) | |
857 | return ret; | |
858 | ||
859 | /* | |
860 | * If we get -EIO above, zero out any newly allocated blocks | |
861 | * to avoid exposing stale data. | |
862 | */ | |
863 | bh = head; | |
864 | block_start = 0; | |
865 | do { | |
9517bac6 MF |
866 | block_end = block_start + bsize; |
867 | if (block_end <= from) | |
868 | goto next_bh; | |
869 | if (block_start >= to) | |
870 | break; | |
871 | ||
54c57dc3 | 872 | zero_user_page(page, block_start, bh->b_size, KM_USER0); |
9517bac6 MF |
873 | set_buffer_uptodate(bh); |
874 | mark_buffer_dirty(bh); | |
875 | ||
876 | next_bh: | |
877 | block_start = block_end; | |
878 | bh = bh->b_this_page; | |
879 | } while (bh != head); | |
880 | ||
881 | return ret; | |
882 | } | |
883 | ||
3a307ffc MF |
884 | #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE) |
885 | #define OCFS2_MAX_CTXT_PAGES 1 | |
886 | #else | |
887 | #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE) | |
888 | #endif | |
889 | ||
890 | #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE) | |
891 | ||
6af67d82 | 892 | /* |
3a307ffc | 893 | * Describe the state of a single cluster to be written to. |
6af67d82 | 894 | */ |
3a307ffc MF |
895 | struct ocfs2_write_cluster_desc { |
896 | u32 c_cpos; | |
897 | u32 c_phys; | |
898 | /* | |
899 | * Give this a unique field because c_phys eventually gets | |
900 | * filled. | |
901 | */ | |
902 | unsigned c_new; | |
b27b7cbc | 903 | unsigned c_unwritten; |
3a307ffc | 904 | }; |
6af67d82 | 905 | |
b27b7cbc MF |
906 | static inline int ocfs2_should_zero_cluster(struct ocfs2_write_cluster_desc *d) |
907 | { | |
908 | return d->c_new || d->c_unwritten; | |
909 | } | |
910 | ||
3a307ffc MF |
911 | struct ocfs2_write_ctxt { |
912 | /* Logical cluster position / len of write */ | |
913 | u32 w_cpos; | |
914 | u32 w_clen; | |
6af67d82 | 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; |
30b8548f | 993 | cend = (pos + len - 1) >> osb->s_clustersize_bits; |
994 | wc->w_clen = cend - wc->w_cpos + 1; | |
607d44aa MF |
995 | get_bh(di_bh); |
996 | wc->w_di_bh = di_bh; | |
6af67d82 | 997 | |
3a307ffc MF |
998 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) |
999 | wc->w_large_pages = 1; | |
1000 | else | |
1001 | wc->w_large_pages = 0; | |
1002 | ||
b27b7cbc MF |
1003 | ocfs2_init_dealloc_ctxt(&wc->w_dealloc); |
1004 | ||
3a307ffc | 1005 | *wcp = wc; |
6af67d82 | 1006 | |
3a307ffc | 1007 | return 0; |
6af67d82 MF |
1008 | } |
1009 | ||
9517bac6 | 1010 | /* |
3a307ffc MF |
1011 | * If a page has any new buffers, zero them out here, and mark them uptodate |
1012 | * and dirty so they'll be written out (in order to prevent uninitialised | |
1013 | * block data from leaking). And clear the new bit. | |
9517bac6 | 1014 | */ |
3a307ffc | 1015 | static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to) |
9517bac6 | 1016 | { |
3a307ffc MF |
1017 | unsigned int block_start, block_end; |
1018 | struct buffer_head *head, *bh; | |
9517bac6 | 1019 | |
3a307ffc MF |
1020 | BUG_ON(!PageLocked(page)); |
1021 | if (!page_has_buffers(page)) | |
1022 | return; | |
9517bac6 | 1023 | |
3a307ffc MF |
1024 | bh = head = page_buffers(page); |
1025 | block_start = 0; | |
1026 | do { | |
1027 | block_end = block_start + bh->b_size; | |
1028 | ||
1029 | if (buffer_new(bh)) { | |
1030 | if (block_end > from && block_start < to) { | |
1031 | if (!PageUptodate(page)) { | |
1032 | unsigned start, end; | |
3a307ffc MF |
1033 | |
1034 | start = max(from, block_start); | |
1035 | end = min(to, block_end); | |
1036 | ||
54c57dc3 | 1037 | zero_user_page(page, start, end - start, KM_USER0); |
3a307ffc MF |
1038 | set_buffer_uptodate(bh); |
1039 | } | |
1040 | ||
1041 | clear_buffer_new(bh); | |
1042 | mark_buffer_dirty(bh); | |
1043 | } | |
1044 | } | |
9517bac6 | 1045 | |
3a307ffc MF |
1046 | block_start = block_end; |
1047 | bh = bh->b_this_page; | |
1048 | } while (bh != head); | |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * Only called when we have a failure during allocating write to write | |
1053 | * zero's to the newly allocated region. | |
1054 | */ | |
1055 | static void ocfs2_write_failure(struct inode *inode, | |
1056 | struct ocfs2_write_ctxt *wc, | |
1057 | loff_t user_pos, unsigned user_len) | |
1058 | { | |
1059 | int i; | |
5c26a7b7 MF |
1060 | unsigned from = user_pos & (PAGE_CACHE_SIZE - 1), |
1061 | to = user_pos + user_len; | |
3a307ffc MF |
1062 | struct page *tmppage; |
1063 | ||
5c26a7b7 | 1064 | ocfs2_zero_new_buffers(wc->w_target_page, from, to); |
9517bac6 | 1065 | |
3a307ffc MF |
1066 | for(i = 0; i < wc->w_num_pages; i++) { |
1067 | tmppage = wc->w_pages[i]; | |
9517bac6 | 1068 | |
3a307ffc MF |
1069 | if (ocfs2_should_order_data(inode)) |
1070 | walk_page_buffers(wc->w_handle, page_buffers(tmppage), | |
1071 | from, to, NULL, | |
1072 | ocfs2_journal_dirty_data); | |
eeb47d12 | 1073 | |
3a307ffc | 1074 | block_commit_write(tmppage, from, to); |
9517bac6 | 1075 | } |
9517bac6 MF |
1076 | } |
1077 | ||
3a307ffc MF |
1078 | static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno, |
1079 | struct ocfs2_write_ctxt *wc, | |
1080 | struct page *page, u32 cpos, | |
1081 | loff_t user_pos, unsigned user_len, | |
1082 | int new) | |
9517bac6 | 1083 | { |
3a307ffc MF |
1084 | int ret; |
1085 | unsigned int map_from = 0, map_to = 0; | |
9517bac6 | 1086 | unsigned int cluster_start, cluster_end; |
3a307ffc | 1087 | unsigned int user_data_from = 0, user_data_to = 0; |
9517bac6 | 1088 | |
3a307ffc | 1089 | ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, |
9517bac6 MF |
1090 | &cluster_start, &cluster_end); |
1091 | ||
3a307ffc MF |
1092 | if (page == wc->w_target_page) { |
1093 | map_from = user_pos & (PAGE_CACHE_SIZE - 1); | |
1094 | map_to = map_from + user_len; | |
1095 | ||
1096 | if (new) | |
1097 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
1098 | cluster_start, cluster_end, | |
1099 | new); | |
1100 | else | |
1101 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
1102 | map_from, map_to, new); | |
1103 | if (ret) { | |
9517bac6 MF |
1104 | mlog_errno(ret); |
1105 | goto out; | |
1106 | } | |
1107 | ||
3a307ffc MF |
1108 | user_data_from = map_from; |
1109 | user_data_to = map_to; | |
9517bac6 | 1110 | if (new) { |
3a307ffc MF |
1111 | map_from = cluster_start; |
1112 | map_to = cluster_end; | |
9517bac6 MF |
1113 | } |
1114 | } else { | |
1115 | /* | |
1116 | * If we haven't allocated the new page yet, we | |
1117 | * shouldn't be writing it out without copying user | |
1118 | * data. This is likely a math error from the caller. | |
1119 | */ | |
1120 | BUG_ON(!new); | |
1121 | ||
3a307ffc MF |
1122 | map_from = cluster_start; |
1123 | map_to = cluster_end; | |
9517bac6 MF |
1124 | |
1125 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
3a307ffc | 1126 | cluster_start, cluster_end, new); |
9517bac6 MF |
1127 | if (ret) { |
1128 | mlog_errno(ret); | |
1129 | goto out; | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | /* | |
1134 | * Parts of newly allocated pages need to be zero'd. | |
1135 | * | |
1136 | * Above, we have also rewritten 'to' and 'from' - as far as | |
1137 | * the rest of the function is concerned, the entire cluster | |
1138 | * range inside of a page needs to be written. | |
1139 | * | |
1140 | * We can skip this if the page is up to date - it's already | |
1141 | * been zero'd from being read in as a hole. | |
1142 | */ | |
1143 | if (new && !PageUptodate(page)) | |
1144 | ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), | |
3a307ffc | 1145 | cpos, user_data_from, user_data_to); |
9517bac6 MF |
1146 | |
1147 | flush_dcache_page(page); | |
1148 | ||
9517bac6 | 1149 | out: |
3a307ffc | 1150 | return ret; |
9517bac6 MF |
1151 | } |
1152 | ||
1153 | /* | |
3a307ffc | 1154 | * This function will only grab one clusters worth of pages. |
9517bac6 | 1155 | */ |
3a307ffc MF |
1156 | static int ocfs2_grab_pages_for_write(struct address_space *mapping, |
1157 | struct ocfs2_write_ctxt *wc, | |
7307de80 MF |
1158 | u32 cpos, loff_t user_pos, int new, |
1159 | struct page *mmap_page) | |
9517bac6 | 1160 | { |
3a307ffc MF |
1161 | int ret = 0, i; |
1162 | unsigned long start, target_index, index; | |
9517bac6 | 1163 | struct inode *inode = mapping->host; |
9517bac6 | 1164 | |
3a307ffc | 1165 | target_index = user_pos >> PAGE_CACHE_SHIFT; |
9517bac6 MF |
1166 | |
1167 | /* | |
1168 | * Figure out how many pages we'll be manipulating here. For | |
60b11392 MF |
1169 | * non allocating write, we just change the one |
1170 | * page. Otherwise, we'll need a whole clusters worth. | |
9517bac6 | 1171 | */ |
9517bac6 | 1172 | if (new) { |
3a307ffc MF |
1173 | wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); |
1174 | start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); | |
9517bac6 | 1175 | } else { |
3a307ffc MF |
1176 | wc->w_num_pages = 1; |
1177 | start = target_index; | |
9517bac6 MF |
1178 | } |
1179 | ||
3a307ffc | 1180 | for(i = 0; i < wc->w_num_pages; i++) { |
9517bac6 MF |
1181 | index = start + i; |
1182 | ||
7307de80 MF |
1183 | if (index == target_index && mmap_page) { |
1184 | /* | |
1185 | * ocfs2_pagemkwrite() is a little different | |
1186 | * and wants us to directly use the page | |
1187 | * passed in. | |
1188 | */ | |
1189 | lock_page(mmap_page); | |
1190 | ||
1191 | if (mmap_page->mapping != mapping) { | |
1192 | unlock_page(mmap_page); | |
1193 | /* | |
1194 | * Sanity check - the locking in | |
1195 | * ocfs2_pagemkwrite() should ensure | |
1196 | * that this code doesn't trigger. | |
1197 | */ | |
1198 | ret = -EINVAL; | |
1199 | mlog_errno(ret); | |
1200 | goto out; | |
1201 | } | |
1202 | ||
1203 | page_cache_get(mmap_page); | |
1204 | wc->w_pages[i] = mmap_page; | |
1205 | } else { | |
1206 | wc->w_pages[i] = find_or_create_page(mapping, index, | |
1207 | GFP_NOFS); | |
1208 | if (!wc->w_pages[i]) { | |
1209 | ret = -ENOMEM; | |
1210 | mlog_errno(ret); | |
1211 | goto out; | |
1212 | } | |
9517bac6 | 1213 | } |
3a307ffc MF |
1214 | |
1215 | if (index == target_index) | |
1216 | wc->w_target_page = wc->w_pages[i]; | |
9517bac6 | 1217 | } |
3a307ffc MF |
1218 | out: |
1219 | return ret; | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Prepare a single cluster for write one cluster into the file. | |
1224 | */ | |
1225 | static int ocfs2_write_cluster(struct address_space *mapping, | |
b27b7cbc MF |
1226 | u32 phys, unsigned int unwritten, |
1227 | struct ocfs2_alloc_context *data_ac, | |
3a307ffc MF |
1228 | struct ocfs2_alloc_context *meta_ac, |
1229 | struct ocfs2_write_ctxt *wc, u32 cpos, | |
1230 | loff_t user_pos, unsigned user_len) | |
1231 | { | |
b27b7cbc | 1232 | int ret, i, new, should_zero = 0; |
3a307ffc MF |
1233 | u64 v_blkno, p_blkno; |
1234 | struct inode *inode = mapping->host; | |
1235 | ||
1236 | new = phys == 0 ? 1 : 0; | |
b27b7cbc MF |
1237 | if (new || unwritten) |
1238 | should_zero = 1; | |
9517bac6 MF |
1239 | |
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; |
9517bac6 | 1248 | ret = ocfs2_do_extend_allocation(OCFS2_SB(inode->i_sb), inode, |
2ae99a60 | 1249 | &tmp_pos, 1, 0, wc->w_di_bh, |
3a307ffc MF |
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 MF |
1268 | } else if (unwritten) { |
1269 | ret = ocfs2_mark_extent_written(inode, wc->w_di_bh, | |
1270 | wc->w_handle, cpos, 1, phys, | |
1271 | meta_ac, &wc->w_dealloc); | |
1272 | if (ret < 0) { | |
1273 | mlog_errno(ret); | |
1274 | goto out; | |
1275 | } | |
1276 | } | |
3a307ffc | 1277 | |
b27b7cbc | 1278 | if (should_zero) |
3a307ffc | 1279 | v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos); |
b27b7cbc | 1280 | else |
3a307ffc | 1281 | v_blkno = user_pos >> inode->i_sb->s_blocksize_bits; |
9517bac6 | 1282 | |
3a307ffc MF |
1283 | /* |
1284 | * The only reason this should fail is due to an inability to | |
1285 | * find the extent added. | |
1286 | */ | |
49cb8d2d MF |
1287 | ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL, |
1288 | NULL); | |
9517bac6 | 1289 | if (ret < 0) { |
3a307ffc MF |
1290 | ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, " |
1291 | "at logical block %llu", | |
1292 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1293 | (unsigned long long)v_blkno); | |
9517bac6 MF |
1294 | goto out; |
1295 | } | |
1296 | ||
1297 | BUG_ON(p_blkno == 0); | |
1298 | ||
3a307ffc MF |
1299 | for(i = 0; i < wc->w_num_pages; i++) { |
1300 | int tmpret; | |
9517bac6 | 1301 | |
3a307ffc MF |
1302 | tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, |
1303 | wc->w_pages[i], cpos, | |
b27b7cbc MF |
1304 | user_pos, user_len, |
1305 | should_zero); | |
3a307ffc MF |
1306 | if (tmpret) { |
1307 | mlog_errno(tmpret); | |
1308 | if (ret == 0) | |
1309 | tmpret = ret; | |
1310 | } | |
9517bac6 MF |
1311 | } |
1312 | ||
3a307ffc MF |
1313 | /* |
1314 | * We only have cleanup to do in case of allocating write. | |
1315 | */ | |
1316 | if (ret && new) | |
1317 | ocfs2_write_failure(inode, wc, user_pos, user_len); | |
1318 | ||
9517bac6 | 1319 | out: |
9517bac6 | 1320 | |
3a307ffc | 1321 | return ret; |
9517bac6 MF |
1322 | } |
1323 | ||
0d172baa MF |
1324 | static int ocfs2_write_cluster_by_desc(struct address_space *mapping, |
1325 | struct ocfs2_alloc_context *data_ac, | |
1326 | struct ocfs2_alloc_context *meta_ac, | |
1327 | struct ocfs2_write_ctxt *wc, | |
1328 | loff_t pos, unsigned len) | |
1329 | { | |
1330 | int ret, i; | |
db56246c MF |
1331 | loff_t cluster_off; |
1332 | unsigned int local_len = len; | |
0d172baa | 1333 | struct ocfs2_write_cluster_desc *desc; |
db56246c | 1334 | struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); |
0d172baa MF |
1335 | |
1336 | for (i = 0; i < wc->w_clen; i++) { | |
1337 | desc = &wc->w_desc[i]; | |
1338 | ||
db56246c MF |
1339 | /* |
1340 | * We have to make sure that the total write passed in | |
1341 | * doesn't extend past a single cluster. | |
1342 | */ | |
1343 | local_len = len; | |
1344 | cluster_off = pos & (osb->s_clustersize - 1); | |
1345 | if ((cluster_off + local_len) > osb->s_clustersize) | |
1346 | local_len = osb->s_clustersize - cluster_off; | |
1347 | ||
b27b7cbc MF |
1348 | ret = ocfs2_write_cluster(mapping, desc->c_phys, |
1349 | desc->c_unwritten, data_ac, meta_ac, | |
db56246c | 1350 | wc, desc->c_cpos, pos, local_len); |
0d172baa MF |
1351 | if (ret) { |
1352 | mlog_errno(ret); | |
1353 | goto out; | |
1354 | } | |
db56246c MF |
1355 | |
1356 | len -= local_len; | |
1357 | pos += local_len; | |
0d172baa MF |
1358 | } |
1359 | ||
1360 | ret = 0; | |
1361 | out: | |
1362 | return ret; | |
1363 | } | |
1364 | ||
3a307ffc MF |
1365 | /* |
1366 | * ocfs2_write_end() wants to know which parts of the target page it | |
1367 | * should complete the write on. It's easiest to compute them ahead of | |
1368 | * time when a more complete view of the write is available. | |
1369 | */ | |
1370 | static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, | |
1371 | struct ocfs2_write_ctxt *wc, | |
1372 | loff_t pos, unsigned len, int alloc) | |
9517bac6 | 1373 | { |
3a307ffc | 1374 | struct ocfs2_write_cluster_desc *desc; |
9517bac6 | 1375 | |
3a307ffc MF |
1376 | wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1); |
1377 | wc->w_target_to = wc->w_target_from + len; | |
1378 | ||
1379 | if (alloc == 0) | |
1380 | return; | |
1381 | ||
1382 | /* | |
1383 | * Allocating write - we may have different boundaries based | |
1384 | * on page size and cluster size. | |
1385 | * | |
1386 | * NOTE: We can no longer compute one value from the other as | |
1387 | * the actual write length and user provided length may be | |
1388 | * different. | |
1389 | */ | |
9517bac6 | 1390 | |
3a307ffc MF |
1391 | if (wc->w_large_pages) { |
1392 | /* | |
1393 | * We only care about the 1st and last cluster within | |
b27b7cbc | 1394 | * our range and whether they should be zero'd or not. Either |
3a307ffc MF |
1395 | * value may be extended out to the start/end of a |
1396 | * newly allocated cluster. | |
1397 | */ | |
1398 | desc = &wc->w_desc[0]; | |
b27b7cbc | 1399 | if (ocfs2_should_zero_cluster(desc)) |
3a307ffc MF |
1400 | ocfs2_figure_cluster_boundaries(osb, |
1401 | desc->c_cpos, | |
1402 | &wc->w_target_from, | |
1403 | NULL); | |
1404 | ||
1405 | desc = &wc->w_desc[wc->w_clen - 1]; | |
b27b7cbc | 1406 | if (ocfs2_should_zero_cluster(desc)) |
3a307ffc MF |
1407 | ocfs2_figure_cluster_boundaries(osb, |
1408 | desc->c_cpos, | |
1409 | NULL, | |
1410 | &wc->w_target_to); | |
1411 | } else { | |
1412 | wc->w_target_from = 0; | |
1413 | wc->w_target_to = PAGE_CACHE_SIZE; | |
1414 | } | |
9517bac6 MF |
1415 | } |
1416 | ||
0d172baa MF |
1417 | /* |
1418 | * Populate each single-cluster write descriptor in the write context | |
1419 | * with information about the i/o to be done. | |
b27b7cbc MF |
1420 | * |
1421 | * Returns the number of clusters that will have to be allocated, as | |
1422 | * well as a worst case estimate of the number of extent records that | |
1423 | * would have to be created during a write to an unwritten region. | |
0d172baa MF |
1424 | */ |
1425 | static int ocfs2_populate_write_desc(struct inode *inode, | |
1426 | struct ocfs2_write_ctxt *wc, | |
b27b7cbc MF |
1427 | unsigned int *clusters_to_alloc, |
1428 | unsigned int *extents_to_split) | |
9517bac6 | 1429 | { |
0d172baa | 1430 | int ret; |
3a307ffc | 1431 | struct ocfs2_write_cluster_desc *desc; |
0d172baa | 1432 | unsigned int num_clusters = 0; |
b27b7cbc | 1433 | unsigned int ext_flags = 0; |
0d172baa MF |
1434 | u32 phys = 0; |
1435 | int i; | |
9517bac6 | 1436 | |
b27b7cbc MF |
1437 | *clusters_to_alloc = 0; |
1438 | *extents_to_split = 0; | |
1439 | ||
3a307ffc MF |
1440 | for (i = 0; i < wc->w_clen; i++) { |
1441 | desc = &wc->w_desc[i]; | |
1442 | desc->c_cpos = wc->w_cpos + i; | |
1443 | ||
1444 | if (num_clusters == 0) { | |
b27b7cbc MF |
1445 | /* |
1446 | * Need to look up the next extent record. | |
1447 | */ | |
3a307ffc | 1448 | ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, |
b27b7cbc | 1449 | &num_clusters, &ext_flags); |
3a307ffc MF |
1450 | if (ret) { |
1451 | mlog_errno(ret); | |
607d44aa | 1452 | goto out; |
3a307ffc | 1453 | } |
b27b7cbc MF |
1454 | |
1455 | /* | |
1456 | * Assume worst case - that we're writing in | |
1457 | * the middle of the extent. | |
1458 | * | |
1459 | * We can assume that the write proceeds from | |
1460 | * left to right, in which case the extent | |
1461 | * insert code is smart enough to coalesce the | |
1462 | * next splits into the previous records created. | |
1463 | */ | |
1464 | if (ext_flags & OCFS2_EXT_UNWRITTEN) | |
1465 | *extents_to_split = *extents_to_split + 2; | |
3a307ffc MF |
1466 | } else if (phys) { |
1467 | /* | |
1468 | * Only increment phys if it doesn't describe | |
1469 | * a hole. | |
1470 | */ | |
1471 | phys++; | |
1472 | } | |
1473 | ||
1474 | desc->c_phys = phys; | |
1475 | if (phys == 0) { | |
1476 | desc->c_new = 1; | |
0d172baa | 1477 | *clusters_to_alloc = *clusters_to_alloc + 1; |
3a307ffc | 1478 | } |
b27b7cbc MF |
1479 | if (ext_flags & OCFS2_EXT_UNWRITTEN) |
1480 | desc->c_unwritten = 1; | |
3a307ffc MF |
1481 | |
1482 | num_clusters--; | |
9517bac6 MF |
1483 | } |
1484 | ||
0d172baa MF |
1485 | ret = 0; |
1486 | out: | |
1487 | return ret; | |
1488 | } | |
1489 | ||
1afc32b9 MF |
1490 | static int ocfs2_write_begin_inline(struct address_space *mapping, |
1491 | struct inode *inode, | |
1492 | struct ocfs2_write_ctxt *wc) | |
1493 | { | |
1494 | int ret; | |
1495 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1496 | struct page *page; | |
1497 | handle_t *handle; | |
1498 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1499 | ||
1500 | page = find_or_create_page(mapping, 0, GFP_NOFS); | |
1501 | if (!page) { | |
1502 | ret = -ENOMEM; | |
1503 | mlog_errno(ret); | |
1504 | goto out; | |
1505 | } | |
1506 | /* | |
1507 | * If we don't set w_num_pages then this page won't get unlocked | |
1508 | * and freed on cleanup of the write context. | |
1509 | */ | |
1510 | wc->w_pages[0] = wc->w_target_page = page; | |
1511 | wc->w_num_pages = 1; | |
1512 | ||
1513 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
1514 | if (IS_ERR(handle)) { | |
1515 | ret = PTR_ERR(handle); | |
1516 | mlog_errno(ret); | |
1517 | goto out; | |
1518 | } | |
1519 | ||
1520 | ret = ocfs2_journal_access(handle, inode, wc->w_di_bh, | |
1521 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1522 | if (ret) { | |
1523 | ocfs2_commit_trans(osb, handle); | |
1524 | ||
1525 | mlog_errno(ret); | |
1526 | goto out; | |
1527 | } | |
1528 | ||
1529 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) | |
1530 | ocfs2_set_inode_data_inline(inode, di); | |
1531 | ||
1532 | if (!PageUptodate(page)) { | |
1533 | ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh); | |
1534 | if (ret) { | |
1535 | ocfs2_commit_trans(osb, handle); | |
1536 | ||
1537 | goto out; | |
1538 | } | |
1539 | } | |
1540 | ||
1541 | wc->w_handle = handle; | |
1542 | out: | |
1543 | return ret; | |
1544 | } | |
1545 | ||
1546 | int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size) | |
1547 | { | |
1548 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
1549 | ||
0d8a4e0c | 1550 | if (new_size <= le16_to_cpu(di->id2.i_data.id_count)) |
1afc32b9 MF |
1551 | return 1; |
1552 | return 0; | |
1553 | } | |
1554 | ||
1555 | static int ocfs2_try_to_write_inline_data(struct address_space *mapping, | |
1556 | struct inode *inode, loff_t pos, | |
1557 | unsigned len, struct page *mmap_page, | |
1558 | struct ocfs2_write_ctxt *wc) | |
1559 | { | |
1560 | int ret, written = 0; | |
1561 | loff_t end = pos + len; | |
1562 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1563 | ||
1564 | mlog(0, "Inode %llu, write of %u bytes at off %llu. features: 0x%x\n", | |
1565 | (unsigned long long)oi->ip_blkno, len, (unsigned long long)pos, | |
1566 | oi->ip_dyn_features); | |
1567 | ||
1568 | /* | |
1569 | * Handle inodes which already have inline data 1st. | |
1570 | */ | |
1571 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { | |
1572 | if (mmap_page == NULL && | |
1573 | ocfs2_size_fits_inline_data(wc->w_di_bh, end)) | |
1574 | goto do_inline_write; | |
1575 | ||
1576 | /* | |
1577 | * The write won't fit - we have to give this inode an | |
1578 | * inline extent list now. | |
1579 | */ | |
1580 | ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh); | |
1581 | if (ret) | |
1582 | mlog_errno(ret); | |
1583 | goto out; | |
1584 | } | |
1585 | ||
1586 | /* | |
1587 | * Check whether the inode can accept inline data. | |
1588 | */ | |
1589 | if (oi->ip_clusters != 0 || i_size_read(inode) != 0) | |
1590 | return 0; | |
1591 | ||
1592 | /* | |
1593 | * Check whether the write can fit. | |
1594 | */ | |
1595 | if (mmap_page || end > ocfs2_max_inline_data(inode->i_sb)) | |
1596 | return 0; | |
1597 | ||
1598 | do_inline_write: | |
1599 | ret = ocfs2_write_begin_inline(mapping, inode, wc); | |
1600 | if (ret) { | |
1601 | mlog_errno(ret); | |
1602 | goto out; | |
1603 | } | |
1604 | ||
1605 | /* | |
1606 | * This signals to the caller that the data can be written | |
1607 | * inline. | |
1608 | */ | |
1609 | written = 1; | |
1610 | out: | |
1611 | return written ? written : ret; | |
1612 | } | |
1613 | ||
65ed39d6 MF |
1614 | /* |
1615 | * This function only does anything for file systems which can't | |
1616 | * handle sparse files. | |
1617 | * | |
1618 | * What we want to do here is fill in any hole between the current end | |
1619 | * of allocation and the end of our write. That way the rest of the | |
1620 | * write path can treat it as an non-allocating write, which has no | |
1621 | * special case code for sparse/nonsparse files. | |
1622 | */ | |
1623 | static int ocfs2_expand_nonsparse_inode(struct inode *inode, loff_t pos, | |
1624 | unsigned len, | |
1625 | struct ocfs2_write_ctxt *wc) | |
1626 | { | |
1627 | int ret; | |
1628 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1629 | loff_t newsize = pos + len; | |
1630 | ||
1631 | if (ocfs2_sparse_alloc(osb)) | |
1632 | return 0; | |
1633 | ||
1634 | if (newsize <= i_size_read(inode)) | |
1635 | return 0; | |
1636 | ||
1637 | ret = ocfs2_extend_no_holes(inode, newsize, newsize - len); | |
1638 | if (ret) | |
1639 | mlog_errno(ret); | |
1640 | ||
1641 | return ret; | |
1642 | } | |
1643 | ||
0d172baa MF |
1644 | int ocfs2_write_begin_nolock(struct address_space *mapping, |
1645 | loff_t pos, unsigned len, unsigned flags, | |
1646 | struct page **pagep, void **fsdata, | |
1647 | struct buffer_head *di_bh, struct page *mmap_page) | |
1648 | { | |
1649 | int ret, credits = OCFS2_INODE_UPDATE_CREDITS; | |
b27b7cbc | 1650 | unsigned int clusters_to_alloc, extents_to_split; |
0d172baa MF |
1651 | struct ocfs2_write_ctxt *wc; |
1652 | struct inode *inode = mapping->host; | |
1653 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1654 | struct ocfs2_dinode *di; | |
1655 | struct ocfs2_alloc_context *data_ac = NULL; | |
1656 | struct ocfs2_alloc_context *meta_ac = NULL; | |
1657 | handle_t *handle; | |
1658 | ||
1659 | ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh); | |
1660 | if (ret) { | |
1661 | mlog_errno(ret); | |
1662 | return ret; | |
1663 | } | |
1664 | ||
1afc32b9 MF |
1665 | if (ocfs2_supports_inline_data(osb)) { |
1666 | ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len, | |
1667 | mmap_page, wc); | |
1668 | if (ret == 1) { | |
1669 | ret = 0; | |
1670 | goto success; | |
1671 | } | |
1672 | if (ret < 0) { | |
1673 | mlog_errno(ret); | |
1674 | goto out; | |
1675 | } | |
1676 | } | |
1677 | ||
65ed39d6 MF |
1678 | ret = ocfs2_expand_nonsparse_inode(inode, pos, len, wc); |
1679 | if (ret) { | |
1680 | mlog_errno(ret); | |
1681 | goto out; | |
1682 | } | |
1683 | ||
b27b7cbc MF |
1684 | ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc, |
1685 | &extents_to_split); | |
0d172baa MF |
1686 | if (ret) { |
1687 | mlog_errno(ret); | |
1688 | goto out; | |
1689 | } | |
1690 | ||
1691 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1692 | ||
3a307ffc MF |
1693 | /* |
1694 | * We set w_target_from, w_target_to here so that | |
1695 | * ocfs2_write_end() knows which range in the target page to | |
1696 | * write out. An allocation requires that we write the entire | |
1697 | * cluster range. | |
1698 | */ | |
b27b7cbc | 1699 | if (clusters_to_alloc || extents_to_split) { |
3a307ffc MF |
1700 | /* |
1701 | * XXX: We are stretching the limits of | |
b27b7cbc | 1702 | * ocfs2_lock_allocators(). It greatly over-estimates |
3a307ffc MF |
1703 | * the work to be done. |
1704 | */ | |
1705 | ret = ocfs2_lock_allocators(inode, di, clusters_to_alloc, | |
b27b7cbc | 1706 | extents_to_split, &data_ac, &meta_ac); |
9517bac6 MF |
1707 | if (ret) { |
1708 | mlog_errno(ret); | |
607d44aa | 1709 | goto out; |
9517bac6 MF |
1710 | } |
1711 | ||
3a307ffc MF |
1712 | credits = ocfs2_calc_extend_credits(inode->i_sb, di, |
1713 | clusters_to_alloc); | |
1714 | ||
9517bac6 MF |
1715 | } |
1716 | ||
b27b7cbc MF |
1717 | ocfs2_set_target_boundaries(osb, wc, pos, len, |
1718 | clusters_to_alloc + extents_to_split); | |
3a307ffc | 1719 | |
9517bac6 MF |
1720 | handle = ocfs2_start_trans(osb, credits); |
1721 | if (IS_ERR(handle)) { | |
1722 | ret = PTR_ERR(handle); | |
1723 | mlog_errno(ret); | |
607d44aa | 1724 | goto out; |
9517bac6 MF |
1725 | } |
1726 | ||
3a307ffc MF |
1727 | wc->w_handle = handle; |
1728 | ||
1729 | /* | |
1730 | * We don't want this to fail in ocfs2_write_end(), so do it | |
1731 | * here. | |
1732 | */ | |
1733 | ret = ocfs2_journal_access(handle, inode, wc->w_di_bh, | |
1734 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1735 | if (ret) { | |
9517bac6 MF |
1736 | mlog_errno(ret); |
1737 | goto out_commit; | |
1738 | } | |
1739 | ||
3a307ffc MF |
1740 | /* |
1741 | * Fill our page array first. That way we've grabbed enough so | |
1742 | * that we can zero and flush if we error after adding the | |
1743 | * extent. | |
1744 | */ | |
1745 | ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, | |
b27b7cbc MF |
1746 | clusters_to_alloc + extents_to_split, |
1747 | mmap_page); | |
9517bac6 MF |
1748 | if (ret) { |
1749 | mlog_errno(ret); | |
1750 | goto out_commit; | |
1751 | } | |
1752 | ||
0d172baa MF |
1753 | ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos, |
1754 | len); | |
1755 | if (ret) { | |
1756 | mlog_errno(ret); | |
1757 | goto out_commit; | |
9517bac6 | 1758 | } |
9517bac6 | 1759 | |
3a307ffc MF |
1760 | if (data_ac) |
1761 | ocfs2_free_alloc_context(data_ac); | |
1762 | if (meta_ac) | |
1763 | ocfs2_free_alloc_context(meta_ac); | |
9517bac6 | 1764 | |
1afc32b9 | 1765 | success: |
3a307ffc MF |
1766 | *pagep = wc->w_target_page; |
1767 | *fsdata = wc; | |
1768 | return 0; | |
9517bac6 MF |
1769 | out_commit: |
1770 | ocfs2_commit_trans(osb, handle); | |
1771 | ||
9517bac6 | 1772 | out: |
3a307ffc MF |
1773 | ocfs2_free_write_ctxt(wc); |
1774 | ||
9517bac6 MF |
1775 | if (data_ac) |
1776 | ocfs2_free_alloc_context(data_ac); | |
1777 | if (meta_ac) | |
1778 | ocfs2_free_alloc_context(meta_ac); | |
3a307ffc MF |
1779 | return ret; |
1780 | } | |
1781 | ||
b6af1bcd NP |
1782 | static int ocfs2_write_begin(struct file *file, struct address_space *mapping, |
1783 | loff_t pos, unsigned len, unsigned flags, | |
1784 | struct page **pagep, void **fsdata) | |
607d44aa MF |
1785 | { |
1786 | int ret; | |
1787 | struct buffer_head *di_bh = NULL; | |
1788 | struct inode *inode = mapping->host; | |
1789 | ||
e63aecb6 | 1790 | ret = ocfs2_inode_lock(inode, &di_bh, 1); |
607d44aa MF |
1791 | if (ret) { |
1792 | mlog_errno(ret); | |
1793 | return ret; | |
1794 | } | |
1795 | ||
1796 | /* | |
1797 | * Take alloc sem here to prevent concurrent lookups. That way | |
1798 | * the mapping, zeroing and tree manipulation within | |
1799 | * ocfs2_write() will be safe against ->readpage(). This | |
1800 | * should also serve to lock out allocation from a shared | |
1801 | * writeable region. | |
1802 | */ | |
1803 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1804 | ||
607d44aa | 1805 | ret = ocfs2_write_begin_nolock(mapping, pos, len, flags, pagep, |
7307de80 | 1806 | fsdata, di_bh, NULL); |
607d44aa MF |
1807 | if (ret) { |
1808 | mlog_errno(ret); | |
c934a92d | 1809 | goto out_fail; |
607d44aa MF |
1810 | } |
1811 | ||
1812 | brelse(di_bh); | |
1813 | ||
1814 | return 0; | |
1815 | ||
607d44aa MF |
1816 | out_fail: |
1817 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1818 | ||
1819 | brelse(di_bh); | |
e63aecb6 | 1820 | ocfs2_inode_unlock(inode, 1); |
607d44aa MF |
1821 | |
1822 | return ret; | |
1823 | } | |
1824 | ||
1afc32b9 MF |
1825 | static void ocfs2_write_end_inline(struct inode *inode, loff_t pos, |
1826 | unsigned len, unsigned *copied, | |
1827 | struct ocfs2_dinode *di, | |
1828 | struct ocfs2_write_ctxt *wc) | |
1829 | { | |
1830 | void *kaddr; | |
1831 | ||
1832 | if (unlikely(*copied < len)) { | |
1833 | if (!PageUptodate(wc->w_target_page)) { | |
1834 | *copied = 0; | |
1835 | return; | |
1836 | } | |
1837 | } | |
1838 | ||
1839 | kaddr = kmap_atomic(wc->w_target_page, KM_USER0); | |
1840 | memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied); | |
1841 | kunmap_atomic(kaddr, KM_USER0); | |
1842 | ||
1843 | mlog(0, "Data written to inode at offset %llu. " | |
1844 | "id_count = %u, copied = %u, i_dyn_features = 0x%x\n", | |
1845 | (unsigned long long)pos, *copied, | |
1846 | le16_to_cpu(di->id2.i_data.id_count), | |
1847 | le16_to_cpu(di->i_dyn_features)); | |
1848 | } | |
1849 | ||
7307de80 MF |
1850 | int ocfs2_write_end_nolock(struct address_space *mapping, |
1851 | loff_t pos, unsigned len, unsigned copied, | |
1852 | struct page *page, void *fsdata) | |
3a307ffc MF |
1853 | { |
1854 | int i; | |
1855 | unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1); | |
1856 | struct inode *inode = mapping->host; | |
1857 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1858 | struct ocfs2_write_ctxt *wc = fsdata; | |
1859 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1860 | handle_t *handle = wc->w_handle; | |
1861 | struct page *tmppage; | |
1862 | ||
1afc32b9 MF |
1863 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
1864 | ocfs2_write_end_inline(inode, pos, len, &copied, di, wc); | |
1865 | goto out_write_size; | |
1866 | } | |
1867 | ||
3a307ffc MF |
1868 | if (unlikely(copied < len)) { |
1869 | if (!PageUptodate(wc->w_target_page)) | |
1870 | copied = 0; | |
1871 | ||
1872 | ocfs2_zero_new_buffers(wc->w_target_page, start+copied, | |
1873 | start+len); | |
1874 | } | |
1875 | flush_dcache_page(wc->w_target_page); | |
1876 | ||
1877 | for(i = 0; i < wc->w_num_pages; i++) { | |
1878 | tmppage = wc->w_pages[i]; | |
1879 | ||
1880 | if (tmppage == wc->w_target_page) { | |
1881 | from = wc->w_target_from; | |
1882 | to = wc->w_target_to; | |
1883 | ||
1884 | BUG_ON(from > PAGE_CACHE_SIZE || | |
1885 | to > PAGE_CACHE_SIZE || | |
1886 | to < from); | |
1887 | } else { | |
1888 | /* | |
1889 | * Pages adjacent to the target (if any) imply | |
1890 | * a hole-filling write in which case we want | |
1891 | * to flush their entire range. | |
1892 | */ | |
1893 | from = 0; | |
1894 | to = PAGE_CACHE_SIZE; | |
1895 | } | |
1896 | ||
1897 | if (ocfs2_should_order_data(inode)) | |
1898 | walk_page_buffers(wc->w_handle, page_buffers(tmppage), | |
1899 | from, to, NULL, | |
1900 | ocfs2_journal_dirty_data); | |
1901 | ||
1902 | block_commit_write(tmppage, from, to); | |
1903 | } | |
1904 | ||
1afc32b9 | 1905 | out_write_size: |
3a307ffc MF |
1906 | pos += copied; |
1907 | if (pos > inode->i_size) { | |
1908 | i_size_write(inode, pos); | |
1909 | mark_inode_dirty(inode); | |
1910 | } | |
1911 | inode->i_blocks = ocfs2_inode_sector_count(inode); | |
1912 | di->i_size = cpu_to_le64((u64)i_size_read(inode)); | |
1913 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
1914 | di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); | |
1915 | di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
3a307ffc MF |
1916 | ocfs2_journal_dirty(handle, wc->w_di_bh); |
1917 | ||
1918 | ocfs2_commit_trans(osb, handle); | |
59a5e416 | 1919 | |
b27b7cbc MF |
1920 | ocfs2_run_deallocs(osb, &wc->w_dealloc); |
1921 | ||
607d44aa MF |
1922 | ocfs2_free_write_ctxt(wc); |
1923 | ||
1924 | return copied; | |
1925 | } | |
1926 | ||
b6af1bcd NP |
1927 | static int ocfs2_write_end(struct file *file, struct address_space *mapping, |
1928 | loff_t pos, unsigned len, unsigned copied, | |
1929 | struct page *page, void *fsdata) | |
607d44aa MF |
1930 | { |
1931 | int ret; | |
1932 | struct inode *inode = mapping->host; | |
1933 | ||
1934 | ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata); | |
1935 | ||
3a307ffc | 1936 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
e63aecb6 | 1937 | ocfs2_inode_unlock(inode, 1); |
9517bac6 | 1938 | |
607d44aa | 1939 | return ret; |
9517bac6 MF |
1940 | } |
1941 | ||
f5e54d6e | 1942 | const struct address_space_operations ocfs2_aops = { |
ccd979bd | 1943 | .readpage = ocfs2_readpage, |
628a24f5 | 1944 | .readpages = ocfs2_readpages, |
ccd979bd | 1945 | .writepage = ocfs2_writepage, |
b6af1bcd NP |
1946 | .write_begin = ocfs2_write_begin, |
1947 | .write_end = ocfs2_write_end, | |
ccd979bd MF |
1948 | .bmap = ocfs2_bmap, |
1949 | .sync_page = block_sync_page, | |
03f981cf JB |
1950 | .direct_IO = ocfs2_direct_IO, |
1951 | .invalidatepage = ocfs2_invalidatepage, | |
1952 | .releasepage = ocfs2_releasepage, | |
1953 | .migratepage = buffer_migrate_page, | |
ccd979bd | 1954 | }; |