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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 | ||
b657c95c | 71 | status = ocfs2_read_inode_block(inode, &bh); |
ccd979bd MF |
72 | if (status < 0) { |
73 | mlog_errno(status); | |
74 | goto bail; | |
75 | } | |
76 | fe = (struct ocfs2_dinode *) bh->b_data; | |
77 | ||
ccd979bd MF |
78 | if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, |
79 | le32_to_cpu(fe->i_clusters))) { | |
80 | mlog(ML_ERROR, "block offset is outside the allocated size: " | |
81 | "%llu\n", (unsigned long long)iblock); | |
82 | goto bail; | |
83 | } | |
84 | ||
85 | /* We don't use the page cache to create symlink data, so if | |
86 | * need be, copy it over from the buffer cache. */ | |
87 | if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { | |
88 | u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + | |
89 | iblock; | |
90 | buffer_cache_bh = sb_getblk(osb->sb, blkno); | |
91 | if (!buffer_cache_bh) { | |
92 | mlog(ML_ERROR, "couldn't getblock for symlink!\n"); | |
93 | goto bail; | |
94 | } | |
95 | ||
96 | /* we haven't locked out transactions, so a commit | |
97 | * could've happened. Since we've got a reference on | |
98 | * the bh, even if it commits while we're doing the | |
99 | * copy, the data is still good. */ | |
100 | if (buffer_jbd(buffer_cache_bh) | |
101 | && ocfs2_inode_is_new(inode)) { | |
102 | kaddr = kmap_atomic(bh_result->b_page, KM_USER0); | |
103 | if (!kaddr) { | |
104 | mlog(ML_ERROR, "couldn't kmap!\n"); | |
105 | goto bail; | |
106 | } | |
107 | memcpy(kaddr + (bh_result->b_size * iblock), | |
108 | buffer_cache_bh->b_data, | |
109 | bh_result->b_size); | |
110 | kunmap_atomic(kaddr, KM_USER0); | |
111 | set_buffer_uptodate(bh_result); | |
112 | } | |
113 | brelse(buffer_cache_bh); | |
114 | } | |
115 | ||
116 | map_bh(bh_result, inode->i_sb, | |
117 | le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); | |
118 | ||
119 | err = 0; | |
120 | ||
121 | bail: | |
a81cb88b | 122 | brelse(bh); |
ccd979bd MF |
123 | |
124 | mlog_exit(err); | |
125 | return err; | |
126 | } | |
127 | ||
128 | static int ocfs2_get_block(struct inode *inode, sector_t iblock, | |
129 | struct buffer_head *bh_result, int create) | |
130 | { | |
131 | int err = 0; | |
49cb8d2d | 132 | unsigned int ext_flags; |
628a24f5 MF |
133 | u64 max_blocks = bh_result->b_size >> inode->i_blkbits; |
134 | u64 p_blkno, count, past_eof; | |
25baf2da | 135 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd MF |
136 | |
137 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, | |
138 | (unsigned long long)iblock, bh_result, create); | |
139 | ||
140 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) | |
141 | mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", | |
142 | inode, inode->i_ino); | |
143 | ||
144 | if (S_ISLNK(inode->i_mode)) { | |
145 | /* this always does I/O for some reason. */ | |
146 | err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); | |
147 | goto bail; | |
148 | } | |
149 | ||
628a24f5 | 150 | err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count, |
49cb8d2d | 151 | &ext_flags); |
ccd979bd MF |
152 | if (err) { |
153 | mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " | |
b0697053 MF |
154 | "%llu, NULL)\n", err, inode, (unsigned long long)iblock, |
155 | (unsigned long long)p_blkno); | |
ccd979bd MF |
156 | goto bail; |
157 | } | |
158 | ||
628a24f5 MF |
159 | if (max_blocks < count) |
160 | count = max_blocks; | |
161 | ||
25baf2da MF |
162 | /* |
163 | * ocfs2 never allocates in this function - the only time we | |
164 | * need to use BH_New is when we're extending i_size on a file | |
165 | * system which doesn't support holes, in which case BH_New | |
166 | * allows block_prepare_write() to zero. | |
c0420ad2 CL |
167 | * |
168 | * If we see this on a sparse file system, then a truncate has | |
169 | * raced us and removed the cluster. In this case, we clear | |
170 | * the buffers dirty and uptodate bits and let the buffer code | |
171 | * ignore it as a hole. | |
25baf2da | 172 | */ |
c0420ad2 CL |
173 | if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) { |
174 | clear_buffer_dirty(bh_result); | |
175 | clear_buffer_uptodate(bh_result); | |
176 | goto bail; | |
177 | } | |
25baf2da | 178 | |
49cb8d2d MF |
179 | /* Treat the unwritten extent as a hole for zeroing purposes. */ |
180 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) | |
25baf2da MF |
181 | map_bh(bh_result, inode->i_sb, p_blkno); |
182 | ||
628a24f5 MF |
183 | bh_result->b_size = count << inode->i_blkbits; |
184 | ||
25baf2da MF |
185 | if (!ocfs2_sparse_alloc(osb)) { |
186 | if (p_blkno == 0) { | |
187 | err = -EIO; | |
188 | mlog(ML_ERROR, | |
189 | "iblock = %llu p_blkno = %llu blkno=(%llu)\n", | |
190 | (unsigned long long)iblock, | |
191 | (unsigned long long)p_blkno, | |
192 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
193 | mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); | |
194 | dump_stack(); | |
195 | } | |
ccd979bd | 196 | |
25baf2da MF |
197 | past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
198 | mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino, | |
199 | (unsigned long long)past_eof); | |
ccd979bd | 200 | |
25baf2da MF |
201 | if (create && (iblock >= past_eof)) |
202 | set_buffer_new(bh_result); | |
203 | } | |
ccd979bd MF |
204 | |
205 | bail: | |
206 | if (err < 0) | |
207 | err = -EIO; | |
208 | ||
209 | mlog_exit(err); | |
210 | return err; | |
211 | } | |
212 | ||
1afc32b9 MF |
213 | int ocfs2_read_inline_data(struct inode *inode, struct page *page, |
214 | struct buffer_head *di_bh) | |
6798d35a MF |
215 | { |
216 | void *kaddr; | |
d2849fb2 | 217 | loff_t size; |
6798d35a MF |
218 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
219 | ||
220 | if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) { | |
221 | ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag", | |
222 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
223 | return -EROFS; | |
224 | } | |
225 | ||
226 | size = i_size_read(inode); | |
227 | ||
228 | if (size > PAGE_CACHE_SIZE || | |
229 | size > ocfs2_max_inline_data(inode->i_sb)) { | |
230 | ocfs2_error(inode->i_sb, | |
d2849fb2 JK |
231 | "Inode %llu has with inline data has bad size: %Lu", |
232 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
233 | (unsigned long long)size); | |
6798d35a MF |
234 | return -EROFS; |
235 | } | |
236 | ||
237 | kaddr = kmap_atomic(page, KM_USER0); | |
238 | if (size) | |
239 | memcpy(kaddr, di->id2.i_data.id_data, size); | |
240 | /* Clear the remaining part of the page */ | |
241 | memset(kaddr + size, 0, PAGE_CACHE_SIZE - size); | |
242 | flush_dcache_page(page); | |
243 | kunmap_atomic(kaddr, KM_USER0); | |
244 | ||
245 | SetPageUptodate(page); | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | static int ocfs2_readpage_inline(struct inode *inode, struct page *page) | |
251 | { | |
252 | int ret; | |
253 | struct buffer_head *di_bh = NULL; | |
6798d35a MF |
254 | |
255 | BUG_ON(!PageLocked(page)); | |
86c838b0 | 256 | BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)); |
6798d35a | 257 | |
b657c95c | 258 | ret = ocfs2_read_inode_block(inode, &di_bh); |
6798d35a MF |
259 | if (ret) { |
260 | mlog_errno(ret); | |
261 | goto out; | |
262 | } | |
263 | ||
264 | ret = ocfs2_read_inline_data(inode, page, di_bh); | |
265 | out: | |
266 | unlock_page(page); | |
267 | ||
268 | brelse(di_bh); | |
269 | return ret; | |
270 | } | |
271 | ||
ccd979bd MF |
272 | static int ocfs2_readpage(struct file *file, struct page *page) |
273 | { | |
274 | struct inode *inode = page->mapping->host; | |
6798d35a | 275 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
ccd979bd MF |
276 | loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT; |
277 | int ret, unlock = 1; | |
278 | ||
279 | mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0)); | |
280 | ||
e63aecb6 | 281 | ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page); |
ccd979bd MF |
282 | if (ret != 0) { |
283 | if (ret == AOP_TRUNCATED_PAGE) | |
284 | unlock = 0; | |
285 | mlog_errno(ret); | |
286 | goto out; | |
287 | } | |
288 | ||
6798d35a | 289 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { |
e9dfc0b2 | 290 | ret = AOP_TRUNCATED_PAGE; |
e63aecb6 | 291 | goto out_inode_unlock; |
e9dfc0b2 | 292 | } |
ccd979bd MF |
293 | |
294 | /* | |
295 | * i_size might have just been updated as we grabed the meta lock. We | |
296 | * might now be discovering a truncate that hit on another node. | |
297 | * block_read_full_page->get_block freaks out if it is asked to read | |
298 | * beyond the end of a file, so we check here. Callers | |
54cb8821 | 299 | * (generic_file_read, vm_ops->fault) are clever enough to check i_size |
ccd979bd MF |
300 | * and notice that the page they just read isn't needed. |
301 | * | |
302 | * XXX sys_readahead() seems to get that wrong? | |
303 | */ | |
304 | if (start >= i_size_read(inode)) { | |
eebd2aa3 | 305 | zero_user(page, 0, PAGE_SIZE); |
ccd979bd MF |
306 | SetPageUptodate(page); |
307 | ret = 0; | |
308 | goto out_alloc; | |
309 | } | |
310 | ||
6798d35a MF |
311 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
312 | ret = ocfs2_readpage_inline(inode, page); | |
313 | else | |
314 | ret = block_read_full_page(page, ocfs2_get_block); | |
ccd979bd MF |
315 | unlock = 0; |
316 | ||
ccd979bd MF |
317 | out_alloc: |
318 | up_read(&OCFS2_I(inode)->ip_alloc_sem); | |
e63aecb6 MF |
319 | out_inode_unlock: |
320 | ocfs2_inode_unlock(inode, 0); | |
ccd979bd MF |
321 | out: |
322 | if (unlock) | |
323 | unlock_page(page); | |
324 | mlog_exit(ret); | |
325 | return ret; | |
326 | } | |
327 | ||
628a24f5 MF |
328 | /* |
329 | * This is used only for read-ahead. Failures or difficult to handle | |
330 | * situations are safe to ignore. | |
331 | * | |
332 | * Right now, we don't bother with BH_Boundary - in-inode extent lists | |
333 | * are quite large (243 extents on 4k blocks), so most inodes don't | |
334 | * grow out to a tree. If need be, detecting boundary extents could | |
335 | * trivially be added in a future version of ocfs2_get_block(). | |
336 | */ | |
337 | static int ocfs2_readpages(struct file *filp, struct address_space *mapping, | |
338 | struct list_head *pages, unsigned nr_pages) | |
339 | { | |
340 | int ret, err = -EIO; | |
341 | struct inode *inode = mapping->host; | |
342 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
343 | loff_t start; | |
344 | struct page *last; | |
345 | ||
346 | /* | |
347 | * Use the nonblocking flag for the dlm code to avoid page | |
348 | * lock inversion, but don't bother with retrying. | |
349 | */ | |
350 | ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK); | |
351 | if (ret) | |
352 | return err; | |
353 | ||
354 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { | |
355 | ocfs2_inode_unlock(inode, 0); | |
356 | return err; | |
357 | } | |
358 | ||
359 | /* | |
360 | * Don't bother with inline-data. There isn't anything | |
361 | * to read-ahead in that case anyway... | |
362 | */ | |
363 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
364 | goto out_unlock; | |
365 | ||
366 | /* | |
367 | * Check whether a remote node truncated this file - we just | |
368 | * drop out in that case as it's not worth handling here. | |
369 | */ | |
370 | last = list_entry(pages->prev, struct page, lru); | |
371 | start = (loff_t)last->index << PAGE_CACHE_SHIFT; | |
372 | if (start >= i_size_read(inode)) | |
373 | goto out_unlock; | |
374 | ||
375 | err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block); | |
376 | ||
377 | out_unlock: | |
378 | up_read(&oi->ip_alloc_sem); | |
379 | ocfs2_inode_unlock(inode, 0); | |
380 | ||
381 | return err; | |
382 | } | |
383 | ||
ccd979bd MF |
384 | /* Note: Because we don't support holes, our allocation has |
385 | * already happened (allocation writes zeros to the file data) | |
386 | * so we don't have to worry about ordered writes in | |
387 | * ocfs2_writepage. | |
388 | * | |
389 | * ->writepage is called during the process of invalidating the page cache | |
390 | * during blocked lock processing. It can't block on any cluster locks | |
391 | * to during block mapping. It's relying on the fact that the block | |
392 | * mapping can't have disappeared under the dirty pages that it is | |
393 | * being asked to write back. | |
394 | */ | |
395 | static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) | |
396 | { | |
397 | int ret; | |
398 | ||
399 | mlog_entry("(0x%p)\n", page); | |
400 | ||
401 | ret = block_write_full_page(page, ocfs2_get_block, wbc); | |
402 | ||
403 | mlog_exit(ret); | |
404 | ||
405 | return ret; | |
406 | } | |
407 | ||
5069120b MF |
408 | /* |
409 | * This is called from ocfs2_write_zero_page() which has handled it's | |
410 | * own cluster locking and has ensured allocation exists for those | |
411 | * blocks to be written. | |
412 | */ | |
53013cba MF |
413 | int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page, |
414 | unsigned from, unsigned to) | |
415 | { | |
416 | int ret; | |
417 | ||
53013cba MF |
418 | ret = block_prepare_write(page, from, to, ocfs2_get_block); |
419 | ||
53013cba MF |
420 | return ret; |
421 | } | |
422 | ||
ccd979bd MF |
423 | /* Taken from ext3. We don't necessarily need the full blown |
424 | * functionality yet, but IMHO it's better to cut and paste the whole | |
425 | * thing so we can avoid introducing our own bugs (and easily pick up | |
426 | * their fixes when they happen) --Mark */ | |
60b11392 MF |
427 | int walk_page_buffers( handle_t *handle, |
428 | struct buffer_head *head, | |
429 | unsigned from, | |
430 | unsigned to, | |
431 | int *partial, | |
432 | int (*fn)( handle_t *handle, | |
433 | struct buffer_head *bh)) | |
ccd979bd MF |
434 | { |
435 | struct buffer_head *bh; | |
436 | unsigned block_start, block_end; | |
437 | unsigned blocksize = head->b_size; | |
438 | int err, ret = 0; | |
439 | struct buffer_head *next; | |
440 | ||
441 | for ( bh = head, block_start = 0; | |
442 | ret == 0 && (bh != head || !block_start); | |
443 | block_start = block_end, bh = next) | |
444 | { | |
445 | next = bh->b_this_page; | |
446 | block_end = block_start + blocksize; | |
447 | if (block_end <= from || block_start >= to) { | |
448 | if (partial && !buffer_uptodate(bh)) | |
449 | *partial = 1; | |
450 | continue; | |
451 | } | |
452 | err = (*fn)(handle, bh); | |
453 | if (!ret) | |
454 | ret = err; | |
455 | } | |
456 | return ret; | |
457 | } | |
458 | ||
1fabe148 | 459 | handle_t *ocfs2_start_walk_page_trans(struct inode *inode, |
ccd979bd MF |
460 | struct page *page, |
461 | unsigned from, | |
462 | unsigned to) | |
463 | { | |
464 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
58dadcdb | 465 | handle_t *handle; |
ccd979bd MF |
466 | int ret = 0; |
467 | ||
65eff9cc | 468 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
58dadcdb | 469 | if (IS_ERR(handle)) { |
ccd979bd MF |
470 | ret = -ENOMEM; |
471 | mlog_errno(ret); | |
472 | goto out; | |
473 | } | |
474 | ||
475 | if (ocfs2_should_order_data(inode)) { | |
2b4e30fb | 476 | ret = ocfs2_jbd2_file_inode(handle, inode); |
2b4e30fb | 477 | if (ret < 0) |
ccd979bd MF |
478 | mlog_errno(ret); |
479 | } | |
480 | out: | |
481 | if (ret) { | |
58dadcdb | 482 | if (!IS_ERR(handle)) |
02dc1af4 | 483 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
484 | handle = ERR_PTR(ret); |
485 | } | |
486 | return handle; | |
487 | } | |
488 | ||
ccd979bd MF |
489 | static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) |
490 | { | |
491 | sector_t status; | |
492 | u64 p_blkno = 0; | |
493 | int err = 0; | |
494 | struct inode *inode = mapping->host; | |
495 | ||
496 | mlog_entry("(block = %llu)\n", (unsigned long long)block); | |
497 | ||
498 | /* We don't need to lock journal system files, since they aren't | |
499 | * accessed concurrently from multiple nodes. | |
500 | */ | |
501 | if (!INODE_JOURNAL(inode)) { | |
e63aecb6 | 502 | err = ocfs2_inode_lock(inode, NULL, 0); |
ccd979bd MF |
503 | if (err) { |
504 | if (err != -ENOENT) | |
505 | mlog_errno(err); | |
506 | goto bail; | |
507 | } | |
508 | down_read(&OCFS2_I(inode)->ip_alloc_sem); | |
509 | } | |
510 | ||
6798d35a MF |
511 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) |
512 | err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, | |
513 | NULL); | |
ccd979bd MF |
514 | |
515 | if (!INODE_JOURNAL(inode)) { | |
516 | up_read(&OCFS2_I(inode)->ip_alloc_sem); | |
e63aecb6 | 517 | ocfs2_inode_unlock(inode, 0); |
ccd979bd MF |
518 | } |
519 | ||
520 | if (err) { | |
521 | mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", | |
522 | (unsigned long long)block); | |
523 | mlog_errno(err); | |
524 | goto bail; | |
525 | } | |
526 | ||
ccd979bd MF |
527 | bail: |
528 | status = err ? 0 : p_blkno; | |
529 | ||
530 | mlog_exit((int)status); | |
531 | ||
532 | return status; | |
533 | } | |
534 | ||
535 | /* | |
536 | * TODO: Make this into a generic get_blocks function. | |
537 | * | |
538 | * From do_direct_io in direct-io.c: | |
539 | * "So what we do is to permit the ->get_blocks function to populate | |
540 | * bh.b_size with the size of IO which is permitted at this offset and | |
541 | * this i_blkbits." | |
542 | * | |
543 | * This function is called directly from get_more_blocks in direct-io.c. | |
544 | * | |
545 | * called like this: dio->get_blocks(dio->inode, fs_startblk, | |
546 | * fs_count, map_bh, dio->rw == WRITE); | |
547 | */ | |
548 | static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock, | |
ccd979bd MF |
549 | struct buffer_head *bh_result, int create) |
550 | { | |
551 | int ret; | |
4f902c37 | 552 | u64 p_blkno, inode_blocks, contig_blocks; |
49cb8d2d | 553 | unsigned int ext_flags; |
184d7d20 | 554 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
1d8fa7a2 | 555 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
ccd979bd | 556 | |
ccd979bd MF |
557 | /* This function won't even be called if the request isn't all |
558 | * nicely aligned and of the right size, so there's no need | |
559 | * for us to check any of that. */ | |
560 | ||
25baf2da | 561 | inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
564f8a32 MF |
562 | |
563 | /* | |
564 | * Any write past EOF is not allowed because we'd be extending. | |
565 | */ | |
566 | if (create && (iblock + max_blocks) > inode_blocks) { | |
ccd979bd MF |
567 | ret = -EIO; |
568 | goto bail; | |
569 | } | |
ccd979bd MF |
570 | |
571 | /* This figures out the size of the next contiguous block, and | |
572 | * our logical offset */ | |
363041a5 | 573 | ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, |
49cb8d2d | 574 | &contig_blocks, &ext_flags); |
ccd979bd MF |
575 | if (ret) { |
576 | mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", | |
577 | (unsigned long long)iblock); | |
578 | ret = -EIO; | |
579 | goto bail; | |
580 | } | |
581 | ||
0e116227 | 582 | if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)) && !p_blkno && create) { |
25baf2da MF |
583 | ocfs2_error(inode->i_sb, |
584 | "Inode %llu has a hole at block %llu\n", | |
585 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
586 | (unsigned long long)iblock); | |
587 | ret = -EROFS; | |
588 | goto bail; | |
589 | } | |
590 | ||
591 | /* | |
592 | * get_more_blocks() expects us to describe a hole by clearing | |
593 | * the mapped bit on bh_result(). | |
49cb8d2d MF |
594 | * |
595 | * Consider an unwritten extent as a hole. | |
25baf2da | 596 | */ |
49cb8d2d | 597 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
25baf2da MF |
598 | map_bh(bh_result, inode->i_sb, p_blkno); |
599 | else { | |
600 | /* | |
601 | * ocfs2_prepare_inode_for_write() should have caught | |
602 | * the case where we'd be filling a hole and triggered | |
603 | * a buffered write instead. | |
604 | */ | |
605 | if (create) { | |
606 | ret = -EIO; | |
607 | mlog_errno(ret); | |
608 | goto bail; | |
609 | } | |
610 | ||
611 | clear_buffer_mapped(bh_result); | |
612 | } | |
ccd979bd MF |
613 | |
614 | /* make sure we don't map more than max_blocks blocks here as | |
615 | that's all the kernel will handle at this point. */ | |
616 | if (max_blocks < contig_blocks) | |
617 | contig_blocks = max_blocks; | |
618 | bh_result->b_size = contig_blocks << blocksize_bits; | |
619 | bail: | |
620 | return ret; | |
621 | } | |
622 | ||
623 | /* | |
624 | * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're | |
625 | * particularly interested in the aio/dio case. Like the core uses | |
626 | * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from | |
627 | * truncation on another. | |
628 | */ | |
629 | static void ocfs2_dio_end_io(struct kiocb *iocb, | |
630 | loff_t offset, | |
631 | ssize_t bytes, | |
632 | void *private) | |
633 | { | |
d28c9174 | 634 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
7cdfc3a1 | 635 | int level; |
ccd979bd MF |
636 | |
637 | /* this io's submitter should not have unlocked this before we could */ | |
638 | BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); | |
7cdfc3a1 | 639 | |
ccd979bd | 640 | ocfs2_iocb_clear_rw_locked(iocb); |
7cdfc3a1 MF |
641 | |
642 | level = ocfs2_iocb_rw_locked_level(iocb); | |
643 | if (!level) | |
644 | up_read(&inode->i_alloc_sem); | |
645 | ocfs2_rw_unlock(inode, level); | |
ccd979bd MF |
646 | } |
647 | ||
03f981cf JB |
648 | /* |
649 | * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen | |
650 | * from ext3. PageChecked() bits have been removed as OCFS2 does not | |
651 | * do journalled data. | |
652 | */ | |
653 | static void ocfs2_invalidatepage(struct page *page, unsigned long offset) | |
654 | { | |
655 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; | |
656 | ||
2b4e30fb | 657 | jbd2_journal_invalidatepage(journal, page, offset); |
03f981cf JB |
658 | } |
659 | ||
660 | static int ocfs2_releasepage(struct page *page, gfp_t wait) | |
661 | { | |
662 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; | |
663 | ||
664 | if (!page_has_buffers(page)) | |
665 | return 0; | |
2b4e30fb | 666 | return jbd2_journal_try_to_free_buffers(journal, page, wait); |
03f981cf JB |
667 | } |
668 | ||
ccd979bd MF |
669 | static ssize_t ocfs2_direct_IO(int rw, |
670 | struct kiocb *iocb, | |
671 | const struct iovec *iov, | |
672 | loff_t offset, | |
673 | unsigned long nr_segs) | |
674 | { | |
675 | struct file *file = iocb->ki_filp; | |
d28c9174 | 676 | struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; |
ccd979bd MF |
677 | int ret; |
678 | ||
679 | mlog_entry_void(); | |
53013cba | 680 | |
6798d35a MF |
681 | /* |
682 | * Fallback to buffered I/O if we see an inode without | |
683 | * extents. | |
684 | */ | |
685 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) | |
686 | return 0; | |
687 | ||
ccd979bd MF |
688 | ret = blockdev_direct_IO_no_locking(rw, iocb, inode, |
689 | inode->i_sb->s_bdev, iov, offset, | |
690 | nr_segs, | |
691 | ocfs2_direct_IO_get_blocks, | |
692 | ocfs2_dio_end_io); | |
c934a92d | 693 | |
ccd979bd MF |
694 | mlog_exit(ret); |
695 | return ret; | |
696 | } | |
697 | ||
9517bac6 MF |
698 | static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, |
699 | u32 cpos, | |
700 | unsigned int *start, | |
701 | unsigned int *end) | |
702 | { | |
703 | unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE; | |
704 | ||
705 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) { | |
706 | unsigned int cpp; | |
707 | ||
708 | cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits); | |
709 | ||
710 | cluster_start = cpos % cpp; | |
711 | cluster_start = cluster_start << osb->s_clustersize_bits; | |
712 | ||
713 | cluster_end = cluster_start + osb->s_clustersize; | |
714 | } | |
715 | ||
716 | BUG_ON(cluster_start > PAGE_SIZE); | |
717 | BUG_ON(cluster_end > PAGE_SIZE); | |
718 | ||
719 | if (start) | |
720 | *start = cluster_start; | |
721 | if (end) | |
722 | *end = cluster_end; | |
723 | } | |
724 | ||
725 | /* | |
726 | * 'from' and 'to' are the region in the page to avoid zeroing. | |
727 | * | |
728 | * If pagesize > clustersize, this function will avoid zeroing outside | |
729 | * of the cluster boundary. | |
730 | * | |
731 | * from == to == 0 is code for "zero the entire cluster region" | |
732 | */ | |
733 | static void ocfs2_clear_page_regions(struct page *page, | |
734 | struct ocfs2_super *osb, u32 cpos, | |
735 | unsigned from, unsigned to) | |
736 | { | |
737 | void *kaddr; | |
738 | unsigned int cluster_start, cluster_end; | |
739 | ||
740 | ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); | |
741 | ||
742 | kaddr = kmap_atomic(page, KM_USER0); | |
743 | ||
744 | if (from || to) { | |
745 | if (from > cluster_start) | |
746 | memset(kaddr + cluster_start, 0, from - cluster_start); | |
747 | if (to < cluster_end) | |
748 | memset(kaddr + to, 0, cluster_end - to); | |
749 | } else { | |
750 | memset(kaddr + cluster_start, 0, cluster_end - cluster_start); | |
751 | } | |
752 | ||
753 | kunmap_atomic(kaddr, KM_USER0); | |
754 | } | |
755 | ||
4e9563fd MF |
756 | /* |
757 | * Nonsparse file systems fully allocate before we get to the write | |
758 | * code. This prevents ocfs2_write() from tagging the write as an | |
759 | * allocating one, which means ocfs2_map_page_blocks() might try to | |
760 | * read-in the blocks at the tail of our file. Avoid reading them by | |
761 | * testing i_size against each block offset. | |
762 | */ | |
763 | static int ocfs2_should_read_blk(struct inode *inode, struct page *page, | |
764 | unsigned int block_start) | |
765 | { | |
766 | u64 offset = page_offset(page) + block_start; | |
767 | ||
768 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) | |
769 | return 1; | |
770 | ||
771 | if (i_size_read(inode) > offset) | |
772 | return 1; | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
9517bac6 MF |
777 | /* |
778 | * Some of this taken from block_prepare_write(). We already have our | |
779 | * mapping by now though, and the entire write will be allocating or | |
780 | * it won't, so not much need to use BH_New. | |
781 | * | |
782 | * This will also skip zeroing, which is handled externally. | |
783 | */ | |
60b11392 MF |
784 | int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, |
785 | struct inode *inode, unsigned int from, | |
786 | unsigned int to, int new) | |
9517bac6 MF |
787 | { |
788 | int ret = 0; | |
789 | struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; | |
790 | unsigned int block_end, block_start; | |
791 | unsigned int bsize = 1 << inode->i_blkbits; | |
792 | ||
793 | if (!page_has_buffers(page)) | |
794 | create_empty_buffers(page, bsize, 0); | |
795 | ||
796 | head = page_buffers(page); | |
797 | for (bh = head, block_start = 0; bh != head || !block_start; | |
798 | bh = bh->b_this_page, block_start += bsize) { | |
799 | block_end = block_start + bsize; | |
800 | ||
3a307ffc MF |
801 | clear_buffer_new(bh); |
802 | ||
9517bac6 MF |
803 | /* |
804 | * Ignore blocks outside of our i/o range - | |
805 | * they may belong to unallocated clusters. | |
806 | */ | |
60b11392 | 807 | if (block_start >= to || block_end <= from) { |
9517bac6 MF |
808 | if (PageUptodate(page)) |
809 | set_buffer_uptodate(bh); | |
810 | continue; | |
811 | } | |
812 | ||
813 | /* | |
814 | * For an allocating write with cluster size >= page | |
815 | * size, we always write the entire page. | |
816 | */ | |
3a307ffc MF |
817 | if (new) |
818 | set_buffer_new(bh); | |
9517bac6 MF |
819 | |
820 | if (!buffer_mapped(bh)) { | |
821 | map_bh(bh, inode->i_sb, *p_blkno); | |
822 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); | |
823 | } | |
824 | ||
825 | if (PageUptodate(page)) { | |
826 | if (!buffer_uptodate(bh)) | |
827 | set_buffer_uptodate(bh); | |
828 | } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && | |
bce99768 | 829 | !buffer_new(bh) && |
4e9563fd | 830 | ocfs2_should_read_blk(inode, page, block_start) && |
bce99768 | 831 | (block_start < from || block_end > to)) { |
9517bac6 MF |
832 | ll_rw_block(READ, 1, &bh); |
833 | *wait_bh++=bh; | |
834 | } | |
835 | ||
836 | *p_blkno = *p_blkno + 1; | |
837 | } | |
838 | ||
839 | /* | |
840 | * If we issued read requests - let them complete. | |
841 | */ | |
842 | while(wait_bh > wait) { | |
843 | wait_on_buffer(*--wait_bh); | |
844 | if (!buffer_uptodate(*wait_bh)) | |
845 | ret = -EIO; | |
846 | } | |
847 | ||
848 | if (ret == 0 || !new) | |
849 | return ret; | |
850 | ||
851 | /* | |
852 | * If we get -EIO above, zero out any newly allocated blocks | |
853 | * to avoid exposing stale data. | |
854 | */ | |
855 | bh = head; | |
856 | block_start = 0; | |
857 | do { | |
9517bac6 MF |
858 | block_end = block_start + bsize; |
859 | if (block_end <= from) | |
860 | goto next_bh; | |
861 | if (block_start >= to) | |
862 | break; | |
863 | ||
eebd2aa3 | 864 | zero_user(page, block_start, bh->b_size); |
9517bac6 MF |
865 | set_buffer_uptodate(bh); |
866 | mark_buffer_dirty(bh); | |
867 | ||
868 | next_bh: | |
869 | block_start = block_end; | |
870 | bh = bh->b_this_page; | |
871 | } while (bh != head); | |
872 | ||
873 | return ret; | |
874 | } | |
875 | ||
3a307ffc MF |
876 | #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE) |
877 | #define OCFS2_MAX_CTXT_PAGES 1 | |
878 | #else | |
879 | #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE) | |
880 | #endif | |
881 | ||
882 | #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE) | |
883 | ||
6af67d82 | 884 | /* |
3a307ffc | 885 | * Describe the state of a single cluster to be written to. |
6af67d82 | 886 | */ |
3a307ffc MF |
887 | struct ocfs2_write_cluster_desc { |
888 | u32 c_cpos; | |
889 | u32 c_phys; | |
890 | /* | |
891 | * Give this a unique field because c_phys eventually gets | |
892 | * filled. | |
893 | */ | |
894 | unsigned c_new; | |
b27b7cbc | 895 | unsigned c_unwritten; |
3a307ffc | 896 | }; |
6af67d82 | 897 | |
b27b7cbc MF |
898 | static inline int ocfs2_should_zero_cluster(struct ocfs2_write_cluster_desc *d) |
899 | { | |
900 | return d->c_new || d->c_unwritten; | |
901 | } | |
902 | ||
3a307ffc MF |
903 | struct ocfs2_write_ctxt { |
904 | /* Logical cluster position / len of write */ | |
905 | u32 w_cpos; | |
906 | u32 w_clen; | |
6af67d82 | 907 | |
3a307ffc | 908 | struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE]; |
6af67d82 | 909 | |
3a307ffc MF |
910 | /* |
911 | * This is true if page_size > cluster_size. | |
912 | * | |
913 | * It triggers a set of special cases during write which might | |
914 | * have to deal with allocating writes to partial pages. | |
915 | */ | |
916 | unsigned int w_large_pages; | |
6af67d82 | 917 | |
3a307ffc MF |
918 | /* |
919 | * Pages involved in this write. | |
920 | * | |
921 | * w_target_page is the page being written to by the user. | |
922 | * | |
923 | * w_pages is an array of pages which always contains | |
924 | * w_target_page, and in the case of an allocating write with | |
925 | * page_size < cluster size, it will contain zero'd and mapped | |
926 | * pages adjacent to w_target_page which need to be written | |
927 | * out in so that future reads from that region will get | |
928 | * zero's. | |
929 | */ | |
930 | struct page *w_pages[OCFS2_MAX_CTXT_PAGES]; | |
931 | unsigned int w_num_pages; | |
932 | struct page *w_target_page; | |
eeb47d12 | 933 | |
3a307ffc MF |
934 | /* |
935 | * ocfs2_write_end() uses this to know what the real range to | |
936 | * write in the target should be. | |
937 | */ | |
938 | unsigned int w_target_from; | |
939 | unsigned int w_target_to; | |
940 | ||
941 | /* | |
942 | * We could use journal_current_handle() but this is cleaner, | |
943 | * IMHO -Mark | |
944 | */ | |
945 | handle_t *w_handle; | |
946 | ||
947 | struct buffer_head *w_di_bh; | |
b27b7cbc MF |
948 | |
949 | struct ocfs2_cached_dealloc_ctxt w_dealloc; | |
3a307ffc MF |
950 | }; |
951 | ||
1d410a6e | 952 | void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages) |
3a307ffc MF |
953 | { |
954 | int i; | |
955 | ||
1d410a6e MF |
956 | for(i = 0; i < num_pages; i++) { |
957 | if (pages[i]) { | |
958 | unlock_page(pages[i]); | |
959 | mark_page_accessed(pages[i]); | |
960 | page_cache_release(pages[i]); | |
961 | } | |
6af67d82 | 962 | } |
1d410a6e MF |
963 | } |
964 | ||
965 | static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc) | |
966 | { | |
967 | ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages); | |
6af67d82 | 968 | |
3a307ffc MF |
969 | brelse(wc->w_di_bh); |
970 | kfree(wc); | |
971 | } | |
972 | ||
973 | static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp, | |
974 | struct ocfs2_super *osb, loff_t pos, | |
607d44aa | 975 | unsigned len, struct buffer_head *di_bh) |
3a307ffc | 976 | { |
30b8548f | 977 | u32 cend; |
3a307ffc MF |
978 | struct ocfs2_write_ctxt *wc; |
979 | ||
980 | wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS); | |
981 | if (!wc) | |
982 | return -ENOMEM; | |
6af67d82 | 983 | |
3a307ffc | 984 | wc->w_cpos = pos >> osb->s_clustersize_bits; |
30b8548f | 985 | cend = (pos + len - 1) >> osb->s_clustersize_bits; |
986 | wc->w_clen = cend - wc->w_cpos + 1; | |
607d44aa MF |
987 | get_bh(di_bh); |
988 | wc->w_di_bh = di_bh; | |
6af67d82 | 989 | |
3a307ffc MF |
990 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) |
991 | wc->w_large_pages = 1; | |
992 | else | |
993 | wc->w_large_pages = 0; | |
994 | ||
b27b7cbc MF |
995 | ocfs2_init_dealloc_ctxt(&wc->w_dealloc); |
996 | ||
3a307ffc | 997 | *wcp = wc; |
6af67d82 | 998 | |
3a307ffc | 999 | return 0; |
6af67d82 MF |
1000 | } |
1001 | ||
9517bac6 | 1002 | /* |
3a307ffc MF |
1003 | * If a page has any new buffers, zero them out here, and mark them uptodate |
1004 | * and dirty so they'll be written out (in order to prevent uninitialised | |
1005 | * block data from leaking). And clear the new bit. | |
9517bac6 | 1006 | */ |
3a307ffc | 1007 | static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to) |
9517bac6 | 1008 | { |
3a307ffc MF |
1009 | unsigned int block_start, block_end; |
1010 | struct buffer_head *head, *bh; | |
9517bac6 | 1011 | |
3a307ffc MF |
1012 | BUG_ON(!PageLocked(page)); |
1013 | if (!page_has_buffers(page)) | |
1014 | return; | |
9517bac6 | 1015 | |
3a307ffc MF |
1016 | bh = head = page_buffers(page); |
1017 | block_start = 0; | |
1018 | do { | |
1019 | block_end = block_start + bh->b_size; | |
1020 | ||
1021 | if (buffer_new(bh)) { | |
1022 | if (block_end > from && block_start < to) { | |
1023 | if (!PageUptodate(page)) { | |
1024 | unsigned start, end; | |
3a307ffc MF |
1025 | |
1026 | start = max(from, block_start); | |
1027 | end = min(to, block_end); | |
1028 | ||
eebd2aa3 | 1029 | zero_user_segment(page, start, end); |
3a307ffc MF |
1030 | set_buffer_uptodate(bh); |
1031 | } | |
1032 | ||
1033 | clear_buffer_new(bh); | |
1034 | mark_buffer_dirty(bh); | |
1035 | } | |
1036 | } | |
9517bac6 | 1037 | |
3a307ffc MF |
1038 | block_start = block_end; |
1039 | bh = bh->b_this_page; | |
1040 | } while (bh != head); | |
1041 | } | |
1042 | ||
1043 | /* | |
1044 | * Only called when we have a failure during allocating write to write | |
1045 | * zero's to the newly allocated region. | |
1046 | */ | |
1047 | static void ocfs2_write_failure(struct inode *inode, | |
1048 | struct ocfs2_write_ctxt *wc, | |
1049 | loff_t user_pos, unsigned user_len) | |
1050 | { | |
1051 | int i; | |
5c26a7b7 MF |
1052 | unsigned from = user_pos & (PAGE_CACHE_SIZE - 1), |
1053 | to = user_pos + user_len; | |
3a307ffc MF |
1054 | struct page *tmppage; |
1055 | ||
5c26a7b7 | 1056 | ocfs2_zero_new_buffers(wc->w_target_page, from, to); |
9517bac6 | 1057 | |
3a307ffc MF |
1058 | for(i = 0; i < wc->w_num_pages; i++) { |
1059 | tmppage = wc->w_pages[i]; | |
9517bac6 | 1060 | |
961cecbe | 1061 | if (page_has_buffers(tmppage)) { |
53ef99ca | 1062 | if (ocfs2_should_order_data(inode)) |
2b4e30fb | 1063 | ocfs2_jbd2_file_inode(wc->w_handle, inode); |
961cecbe SM |
1064 | |
1065 | block_commit_write(tmppage, from, to); | |
1066 | } | |
9517bac6 | 1067 | } |
9517bac6 MF |
1068 | } |
1069 | ||
3a307ffc MF |
1070 | static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno, |
1071 | struct ocfs2_write_ctxt *wc, | |
1072 | struct page *page, u32 cpos, | |
1073 | loff_t user_pos, unsigned user_len, | |
1074 | int new) | |
9517bac6 | 1075 | { |
3a307ffc MF |
1076 | int ret; |
1077 | unsigned int map_from = 0, map_to = 0; | |
9517bac6 | 1078 | unsigned int cluster_start, cluster_end; |
3a307ffc | 1079 | unsigned int user_data_from = 0, user_data_to = 0; |
9517bac6 | 1080 | |
3a307ffc | 1081 | ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, |
9517bac6 MF |
1082 | &cluster_start, &cluster_end); |
1083 | ||
3a307ffc MF |
1084 | if (page == wc->w_target_page) { |
1085 | map_from = user_pos & (PAGE_CACHE_SIZE - 1); | |
1086 | map_to = map_from + user_len; | |
1087 | ||
1088 | if (new) | |
1089 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
1090 | cluster_start, cluster_end, | |
1091 | new); | |
1092 | else | |
1093 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
1094 | map_from, map_to, new); | |
1095 | if (ret) { | |
9517bac6 MF |
1096 | mlog_errno(ret); |
1097 | goto out; | |
1098 | } | |
1099 | ||
3a307ffc MF |
1100 | user_data_from = map_from; |
1101 | user_data_to = map_to; | |
9517bac6 | 1102 | if (new) { |
3a307ffc MF |
1103 | map_from = cluster_start; |
1104 | map_to = cluster_end; | |
9517bac6 MF |
1105 | } |
1106 | } else { | |
1107 | /* | |
1108 | * If we haven't allocated the new page yet, we | |
1109 | * shouldn't be writing it out without copying user | |
1110 | * data. This is likely a math error from the caller. | |
1111 | */ | |
1112 | BUG_ON(!new); | |
1113 | ||
3a307ffc MF |
1114 | map_from = cluster_start; |
1115 | map_to = cluster_end; | |
9517bac6 MF |
1116 | |
1117 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, | |
3a307ffc | 1118 | cluster_start, cluster_end, new); |
9517bac6 MF |
1119 | if (ret) { |
1120 | mlog_errno(ret); | |
1121 | goto out; | |
1122 | } | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * Parts of newly allocated pages need to be zero'd. | |
1127 | * | |
1128 | * Above, we have also rewritten 'to' and 'from' - as far as | |
1129 | * the rest of the function is concerned, the entire cluster | |
1130 | * range inside of a page needs to be written. | |
1131 | * | |
1132 | * We can skip this if the page is up to date - it's already | |
1133 | * been zero'd from being read in as a hole. | |
1134 | */ | |
1135 | if (new && !PageUptodate(page)) | |
1136 | ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), | |
3a307ffc | 1137 | cpos, user_data_from, user_data_to); |
9517bac6 MF |
1138 | |
1139 | flush_dcache_page(page); | |
1140 | ||
9517bac6 | 1141 | out: |
3a307ffc | 1142 | return ret; |
9517bac6 MF |
1143 | } |
1144 | ||
1145 | /* | |
3a307ffc | 1146 | * This function will only grab one clusters worth of pages. |
9517bac6 | 1147 | */ |
3a307ffc MF |
1148 | static int ocfs2_grab_pages_for_write(struct address_space *mapping, |
1149 | struct ocfs2_write_ctxt *wc, | |
7307de80 MF |
1150 | u32 cpos, loff_t user_pos, int new, |
1151 | struct page *mmap_page) | |
9517bac6 | 1152 | { |
3a307ffc MF |
1153 | int ret = 0, i; |
1154 | unsigned long start, target_index, index; | |
9517bac6 | 1155 | struct inode *inode = mapping->host; |
9517bac6 | 1156 | |
3a307ffc | 1157 | target_index = user_pos >> PAGE_CACHE_SHIFT; |
9517bac6 MF |
1158 | |
1159 | /* | |
1160 | * Figure out how many pages we'll be manipulating here. For | |
60b11392 MF |
1161 | * non allocating write, we just change the one |
1162 | * page. Otherwise, we'll need a whole clusters worth. | |
9517bac6 | 1163 | */ |
9517bac6 | 1164 | if (new) { |
3a307ffc MF |
1165 | wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); |
1166 | start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); | |
9517bac6 | 1167 | } else { |
3a307ffc MF |
1168 | wc->w_num_pages = 1; |
1169 | start = target_index; | |
9517bac6 MF |
1170 | } |
1171 | ||
3a307ffc | 1172 | for(i = 0; i < wc->w_num_pages; i++) { |
9517bac6 MF |
1173 | index = start + i; |
1174 | ||
7307de80 MF |
1175 | if (index == target_index && mmap_page) { |
1176 | /* | |
1177 | * ocfs2_pagemkwrite() is a little different | |
1178 | * and wants us to directly use the page | |
1179 | * passed in. | |
1180 | */ | |
1181 | lock_page(mmap_page); | |
1182 | ||
1183 | if (mmap_page->mapping != mapping) { | |
1184 | unlock_page(mmap_page); | |
1185 | /* | |
1186 | * Sanity check - the locking in | |
1187 | * ocfs2_pagemkwrite() should ensure | |
1188 | * that this code doesn't trigger. | |
1189 | */ | |
1190 | ret = -EINVAL; | |
1191 | mlog_errno(ret); | |
1192 | goto out; | |
1193 | } | |
1194 | ||
1195 | page_cache_get(mmap_page); | |
1196 | wc->w_pages[i] = mmap_page; | |
1197 | } else { | |
1198 | wc->w_pages[i] = find_or_create_page(mapping, index, | |
1199 | GFP_NOFS); | |
1200 | if (!wc->w_pages[i]) { | |
1201 | ret = -ENOMEM; | |
1202 | mlog_errno(ret); | |
1203 | goto out; | |
1204 | } | |
9517bac6 | 1205 | } |
3a307ffc MF |
1206 | |
1207 | if (index == target_index) | |
1208 | wc->w_target_page = wc->w_pages[i]; | |
9517bac6 | 1209 | } |
3a307ffc MF |
1210 | out: |
1211 | return ret; | |
1212 | } | |
1213 | ||
1214 | /* | |
1215 | * Prepare a single cluster for write one cluster into the file. | |
1216 | */ | |
1217 | static int ocfs2_write_cluster(struct address_space *mapping, | |
b27b7cbc MF |
1218 | u32 phys, unsigned int unwritten, |
1219 | struct ocfs2_alloc_context *data_ac, | |
3a307ffc MF |
1220 | struct ocfs2_alloc_context *meta_ac, |
1221 | struct ocfs2_write_ctxt *wc, u32 cpos, | |
1222 | loff_t user_pos, unsigned user_len) | |
1223 | { | |
b27b7cbc | 1224 | int ret, i, new, should_zero = 0; |
3a307ffc MF |
1225 | u64 v_blkno, p_blkno; |
1226 | struct inode *inode = mapping->host; | |
f99b9b7c | 1227 | struct ocfs2_extent_tree et; |
3a307ffc MF |
1228 | |
1229 | new = phys == 0 ? 1 : 0; | |
b27b7cbc MF |
1230 | if (new || unwritten) |
1231 | should_zero = 1; | |
9517bac6 MF |
1232 | |
1233 | if (new) { | |
3a307ffc MF |
1234 | u32 tmp_pos; |
1235 | ||
9517bac6 MF |
1236 | /* |
1237 | * This is safe to call with the page locks - it won't take | |
1238 | * any additional semaphores or cluster locks. | |
1239 | */ | |
3a307ffc | 1240 | tmp_pos = cpos; |
0eb8d47e TM |
1241 | ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode, |
1242 | &tmp_pos, 1, 0, wc->w_di_bh, | |
1243 | wc->w_handle, data_ac, | |
1244 | meta_ac, NULL); | |
9517bac6 MF |
1245 | /* |
1246 | * This shouldn't happen because we must have already | |
1247 | * calculated the correct meta data allocation required. The | |
1248 | * internal tree allocation code should know how to increase | |
1249 | * transaction credits itself. | |
1250 | * | |
1251 | * If need be, we could handle -EAGAIN for a | |
1252 | * RESTART_TRANS here. | |
1253 | */ | |
1254 | mlog_bug_on_msg(ret == -EAGAIN, | |
1255 | "Inode %llu: EAGAIN return during allocation.\n", | |
1256 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1257 | if (ret < 0) { | |
1258 | mlog_errno(ret); | |
1259 | goto out; | |
1260 | } | |
b27b7cbc | 1261 | } else if (unwritten) { |
8d6220d6 | 1262 | ocfs2_init_dinode_extent_tree(&et, inode, wc->w_di_bh); |
f99b9b7c | 1263 | ret = ocfs2_mark_extent_written(inode, &et, |
b27b7cbc | 1264 | wc->w_handle, cpos, 1, phys, |
f99b9b7c | 1265 | meta_ac, &wc->w_dealloc); |
b27b7cbc MF |
1266 | if (ret < 0) { |
1267 | mlog_errno(ret); | |
1268 | goto out; | |
1269 | } | |
1270 | } | |
3a307ffc | 1271 | |
b27b7cbc | 1272 | if (should_zero) |
3a307ffc | 1273 | v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos); |
b27b7cbc | 1274 | else |
3a307ffc | 1275 | v_blkno = user_pos >> inode->i_sb->s_blocksize_bits; |
9517bac6 | 1276 | |
3a307ffc MF |
1277 | /* |
1278 | * The only reason this should fail is due to an inability to | |
1279 | * find the extent added. | |
1280 | */ | |
49cb8d2d MF |
1281 | ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL, |
1282 | NULL); | |
9517bac6 | 1283 | if (ret < 0) { |
3a307ffc MF |
1284 | ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, " |
1285 | "at logical block %llu", | |
1286 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1287 | (unsigned long long)v_blkno); | |
9517bac6 MF |
1288 | goto out; |
1289 | } | |
1290 | ||
1291 | BUG_ON(p_blkno == 0); | |
1292 | ||
3a307ffc MF |
1293 | for(i = 0; i < wc->w_num_pages; i++) { |
1294 | int tmpret; | |
9517bac6 | 1295 | |
3a307ffc MF |
1296 | tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, |
1297 | wc->w_pages[i], cpos, | |
b27b7cbc MF |
1298 | user_pos, user_len, |
1299 | should_zero); | |
3a307ffc MF |
1300 | if (tmpret) { |
1301 | mlog_errno(tmpret); | |
1302 | if (ret == 0) | |
1303 | tmpret = ret; | |
1304 | } | |
9517bac6 MF |
1305 | } |
1306 | ||
3a307ffc MF |
1307 | /* |
1308 | * We only have cleanup to do in case of allocating write. | |
1309 | */ | |
1310 | if (ret && new) | |
1311 | ocfs2_write_failure(inode, wc, user_pos, user_len); | |
1312 | ||
9517bac6 | 1313 | out: |
9517bac6 | 1314 | |
3a307ffc | 1315 | return ret; |
9517bac6 MF |
1316 | } |
1317 | ||
0d172baa MF |
1318 | static int ocfs2_write_cluster_by_desc(struct address_space *mapping, |
1319 | struct ocfs2_alloc_context *data_ac, | |
1320 | struct ocfs2_alloc_context *meta_ac, | |
1321 | struct ocfs2_write_ctxt *wc, | |
1322 | loff_t pos, unsigned len) | |
1323 | { | |
1324 | int ret, i; | |
db56246c MF |
1325 | loff_t cluster_off; |
1326 | unsigned int local_len = len; | |
0d172baa | 1327 | struct ocfs2_write_cluster_desc *desc; |
db56246c | 1328 | struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); |
0d172baa MF |
1329 | |
1330 | for (i = 0; i < wc->w_clen; i++) { | |
1331 | desc = &wc->w_desc[i]; | |
1332 | ||
db56246c MF |
1333 | /* |
1334 | * We have to make sure that the total write passed in | |
1335 | * doesn't extend past a single cluster. | |
1336 | */ | |
1337 | local_len = len; | |
1338 | cluster_off = pos & (osb->s_clustersize - 1); | |
1339 | if ((cluster_off + local_len) > osb->s_clustersize) | |
1340 | local_len = osb->s_clustersize - cluster_off; | |
1341 | ||
b27b7cbc MF |
1342 | ret = ocfs2_write_cluster(mapping, desc->c_phys, |
1343 | desc->c_unwritten, data_ac, meta_ac, | |
db56246c | 1344 | wc, desc->c_cpos, pos, local_len); |
0d172baa MF |
1345 | if (ret) { |
1346 | mlog_errno(ret); | |
1347 | goto out; | |
1348 | } | |
db56246c MF |
1349 | |
1350 | len -= local_len; | |
1351 | pos += local_len; | |
0d172baa MF |
1352 | } |
1353 | ||
1354 | ret = 0; | |
1355 | out: | |
1356 | return ret; | |
1357 | } | |
1358 | ||
3a307ffc MF |
1359 | /* |
1360 | * ocfs2_write_end() wants to know which parts of the target page it | |
1361 | * should complete the write on. It's easiest to compute them ahead of | |
1362 | * time when a more complete view of the write is available. | |
1363 | */ | |
1364 | static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, | |
1365 | struct ocfs2_write_ctxt *wc, | |
1366 | loff_t pos, unsigned len, int alloc) | |
9517bac6 | 1367 | { |
3a307ffc | 1368 | struct ocfs2_write_cluster_desc *desc; |
9517bac6 | 1369 | |
3a307ffc MF |
1370 | wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1); |
1371 | wc->w_target_to = wc->w_target_from + len; | |
1372 | ||
1373 | if (alloc == 0) | |
1374 | return; | |
1375 | ||
1376 | /* | |
1377 | * Allocating write - we may have different boundaries based | |
1378 | * on page size and cluster size. | |
1379 | * | |
1380 | * NOTE: We can no longer compute one value from the other as | |
1381 | * the actual write length and user provided length may be | |
1382 | * different. | |
1383 | */ | |
9517bac6 | 1384 | |
3a307ffc MF |
1385 | if (wc->w_large_pages) { |
1386 | /* | |
1387 | * We only care about the 1st and last cluster within | |
b27b7cbc | 1388 | * our range and whether they should be zero'd or not. Either |
3a307ffc MF |
1389 | * value may be extended out to the start/end of a |
1390 | * newly allocated cluster. | |
1391 | */ | |
1392 | desc = &wc->w_desc[0]; | |
b27b7cbc | 1393 | if (ocfs2_should_zero_cluster(desc)) |
3a307ffc MF |
1394 | ocfs2_figure_cluster_boundaries(osb, |
1395 | desc->c_cpos, | |
1396 | &wc->w_target_from, | |
1397 | NULL); | |
1398 | ||
1399 | desc = &wc->w_desc[wc->w_clen - 1]; | |
b27b7cbc | 1400 | if (ocfs2_should_zero_cluster(desc)) |
3a307ffc MF |
1401 | ocfs2_figure_cluster_boundaries(osb, |
1402 | desc->c_cpos, | |
1403 | NULL, | |
1404 | &wc->w_target_to); | |
1405 | } else { | |
1406 | wc->w_target_from = 0; | |
1407 | wc->w_target_to = PAGE_CACHE_SIZE; | |
1408 | } | |
9517bac6 MF |
1409 | } |
1410 | ||
0d172baa MF |
1411 | /* |
1412 | * Populate each single-cluster write descriptor in the write context | |
1413 | * with information about the i/o to be done. | |
b27b7cbc MF |
1414 | * |
1415 | * Returns the number of clusters that will have to be allocated, as | |
1416 | * well as a worst case estimate of the number of extent records that | |
1417 | * would have to be created during a write to an unwritten region. | |
0d172baa MF |
1418 | */ |
1419 | static int ocfs2_populate_write_desc(struct inode *inode, | |
1420 | struct ocfs2_write_ctxt *wc, | |
b27b7cbc MF |
1421 | unsigned int *clusters_to_alloc, |
1422 | unsigned int *extents_to_split) | |
9517bac6 | 1423 | { |
0d172baa | 1424 | int ret; |
3a307ffc | 1425 | struct ocfs2_write_cluster_desc *desc; |
0d172baa | 1426 | unsigned int num_clusters = 0; |
b27b7cbc | 1427 | unsigned int ext_flags = 0; |
0d172baa MF |
1428 | u32 phys = 0; |
1429 | int i; | |
9517bac6 | 1430 | |
b27b7cbc MF |
1431 | *clusters_to_alloc = 0; |
1432 | *extents_to_split = 0; | |
1433 | ||
3a307ffc MF |
1434 | for (i = 0; i < wc->w_clen; i++) { |
1435 | desc = &wc->w_desc[i]; | |
1436 | desc->c_cpos = wc->w_cpos + i; | |
1437 | ||
1438 | if (num_clusters == 0) { | |
b27b7cbc MF |
1439 | /* |
1440 | * Need to look up the next extent record. | |
1441 | */ | |
3a307ffc | 1442 | ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, |
b27b7cbc | 1443 | &num_clusters, &ext_flags); |
3a307ffc MF |
1444 | if (ret) { |
1445 | mlog_errno(ret); | |
607d44aa | 1446 | goto out; |
3a307ffc | 1447 | } |
b27b7cbc MF |
1448 | |
1449 | /* | |
1450 | * Assume worst case - that we're writing in | |
1451 | * the middle of the extent. | |
1452 | * | |
1453 | * We can assume that the write proceeds from | |
1454 | * left to right, in which case the extent | |
1455 | * insert code is smart enough to coalesce the | |
1456 | * next splits into the previous records created. | |
1457 | */ | |
1458 | if (ext_flags & OCFS2_EXT_UNWRITTEN) | |
1459 | *extents_to_split = *extents_to_split + 2; | |
3a307ffc MF |
1460 | } else if (phys) { |
1461 | /* | |
1462 | * Only increment phys if it doesn't describe | |
1463 | * a hole. | |
1464 | */ | |
1465 | phys++; | |
1466 | } | |
1467 | ||
1468 | desc->c_phys = phys; | |
1469 | if (phys == 0) { | |
1470 | desc->c_new = 1; | |
0d172baa | 1471 | *clusters_to_alloc = *clusters_to_alloc + 1; |
3a307ffc | 1472 | } |
b27b7cbc MF |
1473 | if (ext_flags & OCFS2_EXT_UNWRITTEN) |
1474 | desc->c_unwritten = 1; | |
3a307ffc MF |
1475 | |
1476 | num_clusters--; | |
9517bac6 MF |
1477 | } |
1478 | ||
0d172baa MF |
1479 | ret = 0; |
1480 | out: | |
1481 | return ret; | |
1482 | } | |
1483 | ||
1afc32b9 MF |
1484 | static int ocfs2_write_begin_inline(struct address_space *mapping, |
1485 | struct inode *inode, | |
1486 | struct ocfs2_write_ctxt *wc) | |
1487 | { | |
1488 | int ret; | |
1489 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1490 | struct page *page; | |
1491 | handle_t *handle; | |
1492 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1493 | ||
1494 | page = find_or_create_page(mapping, 0, GFP_NOFS); | |
1495 | if (!page) { | |
1496 | ret = -ENOMEM; | |
1497 | mlog_errno(ret); | |
1498 | goto out; | |
1499 | } | |
1500 | /* | |
1501 | * If we don't set w_num_pages then this page won't get unlocked | |
1502 | * and freed on cleanup of the write context. | |
1503 | */ | |
1504 | wc->w_pages[0] = wc->w_target_page = page; | |
1505 | wc->w_num_pages = 1; | |
1506 | ||
1507 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
1508 | if (IS_ERR(handle)) { | |
1509 | ret = PTR_ERR(handle); | |
1510 | mlog_errno(ret); | |
1511 | goto out; | |
1512 | } | |
1513 | ||
1514 | ret = ocfs2_journal_access(handle, inode, wc->w_di_bh, | |
1515 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1516 | if (ret) { | |
1517 | ocfs2_commit_trans(osb, handle); | |
1518 | ||
1519 | mlog_errno(ret); | |
1520 | goto out; | |
1521 | } | |
1522 | ||
1523 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) | |
1524 | ocfs2_set_inode_data_inline(inode, di); | |
1525 | ||
1526 | if (!PageUptodate(page)) { | |
1527 | ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh); | |
1528 | if (ret) { | |
1529 | ocfs2_commit_trans(osb, handle); | |
1530 | ||
1531 | goto out; | |
1532 | } | |
1533 | } | |
1534 | ||
1535 | wc->w_handle = handle; | |
1536 | out: | |
1537 | return ret; | |
1538 | } | |
1539 | ||
1540 | int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size) | |
1541 | { | |
1542 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
1543 | ||
0d8a4e0c | 1544 | if (new_size <= le16_to_cpu(di->id2.i_data.id_count)) |
1afc32b9 MF |
1545 | return 1; |
1546 | return 0; | |
1547 | } | |
1548 | ||
1549 | static int ocfs2_try_to_write_inline_data(struct address_space *mapping, | |
1550 | struct inode *inode, loff_t pos, | |
1551 | unsigned len, struct page *mmap_page, | |
1552 | struct ocfs2_write_ctxt *wc) | |
1553 | { | |
1554 | int ret, written = 0; | |
1555 | loff_t end = pos + len; | |
1556 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
1557 | ||
1558 | mlog(0, "Inode %llu, write of %u bytes at off %llu. features: 0x%x\n", | |
1559 | (unsigned long long)oi->ip_blkno, len, (unsigned long long)pos, | |
1560 | oi->ip_dyn_features); | |
1561 | ||
1562 | /* | |
1563 | * Handle inodes which already have inline data 1st. | |
1564 | */ | |
1565 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { | |
1566 | if (mmap_page == NULL && | |
1567 | ocfs2_size_fits_inline_data(wc->w_di_bh, end)) | |
1568 | goto do_inline_write; | |
1569 | ||
1570 | /* | |
1571 | * The write won't fit - we have to give this inode an | |
1572 | * inline extent list now. | |
1573 | */ | |
1574 | ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh); | |
1575 | if (ret) | |
1576 | mlog_errno(ret); | |
1577 | goto out; | |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * Check whether the inode can accept inline data. | |
1582 | */ | |
1583 | if (oi->ip_clusters != 0 || i_size_read(inode) != 0) | |
1584 | return 0; | |
1585 | ||
1586 | /* | |
1587 | * Check whether the write can fit. | |
1588 | */ | |
1589 | if (mmap_page || end > ocfs2_max_inline_data(inode->i_sb)) | |
1590 | return 0; | |
1591 | ||
1592 | do_inline_write: | |
1593 | ret = ocfs2_write_begin_inline(mapping, inode, wc); | |
1594 | if (ret) { | |
1595 | mlog_errno(ret); | |
1596 | goto out; | |
1597 | } | |
1598 | ||
1599 | /* | |
1600 | * This signals to the caller that the data can be written | |
1601 | * inline. | |
1602 | */ | |
1603 | written = 1; | |
1604 | out: | |
1605 | return written ? written : ret; | |
1606 | } | |
1607 | ||
65ed39d6 MF |
1608 | /* |
1609 | * This function only does anything for file systems which can't | |
1610 | * handle sparse files. | |
1611 | * | |
1612 | * What we want to do here is fill in any hole between the current end | |
1613 | * of allocation and the end of our write. That way the rest of the | |
1614 | * write path can treat it as an non-allocating write, which has no | |
1615 | * special case code for sparse/nonsparse files. | |
1616 | */ | |
1617 | static int ocfs2_expand_nonsparse_inode(struct inode *inode, loff_t pos, | |
1618 | unsigned len, | |
1619 | struct ocfs2_write_ctxt *wc) | |
1620 | { | |
1621 | int ret; | |
1622 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1623 | loff_t newsize = pos + len; | |
1624 | ||
1625 | if (ocfs2_sparse_alloc(osb)) | |
1626 | return 0; | |
1627 | ||
1628 | if (newsize <= i_size_read(inode)) | |
1629 | return 0; | |
1630 | ||
1631 | ret = ocfs2_extend_no_holes(inode, newsize, newsize - len); | |
1632 | if (ret) | |
1633 | mlog_errno(ret); | |
1634 | ||
1635 | return ret; | |
1636 | } | |
1637 | ||
0d172baa MF |
1638 | int ocfs2_write_begin_nolock(struct address_space *mapping, |
1639 | loff_t pos, unsigned len, unsigned flags, | |
1640 | struct page **pagep, void **fsdata, | |
1641 | struct buffer_head *di_bh, struct page *mmap_page) | |
1642 | { | |
1643 | int ret, credits = OCFS2_INODE_UPDATE_CREDITS; | |
b27b7cbc | 1644 | unsigned int clusters_to_alloc, extents_to_split; |
0d172baa MF |
1645 | struct ocfs2_write_ctxt *wc; |
1646 | struct inode *inode = mapping->host; | |
1647 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1648 | struct ocfs2_dinode *di; | |
1649 | struct ocfs2_alloc_context *data_ac = NULL; | |
1650 | struct ocfs2_alloc_context *meta_ac = NULL; | |
1651 | handle_t *handle; | |
f99b9b7c | 1652 | struct ocfs2_extent_tree et; |
0d172baa MF |
1653 | |
1654 | ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh); | |
1655 | if (ret) { | |
1656 | mlog_errno(ret); | |
1657 | return ret; | |
1658 | } | |
1659 | ||
1afc32b9 MF |
1660 | if (ocfs2_supports_inline_data(osb)) { |
1661 | ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len, | |
1662 | mmap_page, wc); | |
1663 | if (ret == 1) { | |
1664 | ret = 0; | |
1665 | goto success; | |
1666 | } | |
1667 | if (ret < 0) { | |
1668 | mlog_errno(ret); | |
1669 | goto out; | |
1670 | } | |
1671 | } | |
1672 | ||
65ed39d6 MF |
1673 | ret = ocfs2_expand_nonsparse_inode(inode, pos, len, wc); |
1674 | if (ret) { | |
1675 | mlog_errno(ret); | |
1676 | goto out; | |
1677 | } | |
1678 | ||
b27b7cbc MF |
1679 | ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc, |
1680 | &extents_to_split); | |
0d172baa MF |
1681 | if (ret) { |
1682 | mlog_errno(ret); | |
1683 | goto out; | |
1684 | } | |
1685 | ||
1686 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1687 | ||
3a307ffc MF |
1688 | /* |
1689 | * We set w_target_from, w_target_to here so that | |
1690 | * ocfs2_write_end() knows which range in the target page to | |
1691 | * write out. An allocation requires that we write the entire | |
1692 | * cluster range. | |
1693 | */ | |
b27b7cbc | 1694 | if (clusters_to_alloc || extents_to_split) { |
3a307ffc MF |
1695 | /* |
1696 | * XXX: We are stretching the limits of | |
b27b7cbc | 1697 | * ocfs2_lock_allocators(). It greatly over-estimates |
3a307ffc MF |
1698 | * the work to be done. |
1699 | */ | |
e7d4cb6b TM |
1700 | mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u," |
1701 | " clusters_to_add = %u, extents_to_split = %u\n", | |
1702 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1703 | (long long)i_size_read(inode), le32_to_cpu(di->i_clusters), | |
1704 | clusters_to_alloc, extents_to_split); | |
1705 | ||
8d6220d6 | 1706 | ocfs2_init_dinode_extent_tree(&et, inode, wc->w_di_bh); |
f99b9b7c | 1707 | ret = ocfs2_lock_allocators(inode, &et, |
231b87d1 | 1708 | clusters_to_alloc, extents_to_split, |
f99b9b7c | 1709 | &data_ac, &meta_ac); |
9517bac6 MF |
1710 | if (ret) { |
1711 | mlog_errno(ret); | |
607d44aa | 1712 | goto out; |
9517bac6 MF |
1713 | } |
1714 | ||
811f933d TM |
1715 | credits = ocfs2_calc_extend_credits(inode->i_sb, |
1716 | &di->id2.i_list, | |
3a307ffc MF |
1717 | clusters_to_alloc); |
1718 | ||
9517bac6 MF |
1719 | } |
1720 | ||
b27b7cbc MF |
1721 | ocfs2_set_target_boundaries(osb, wc, pos, len, |
1722 | clusters_to_alloc + extents_to_split); | |
3a307ffc | 1723 | |
9517bac6 MF |
1724 | handle = ocfs2_start_trans(osb, credits); |
1725 | if (IS_ERR(handle)) { | |
1726 | ret = PTR_ERR(handle); | |
1727 | mlog_errno(ret); | |
607d44aa | 1728 | goto out; |
9517bac6 MF |
1729 | } |
1730 | ||
3a307ffc MF |
1731 | wc->w_handle = handle; |
1732 | ||
1733 | /* | |
1734 | * We don't want this to fail in ocfs2_write_end(), so do it | |
1735 | * here. | |
1736 | */ | |
1737 | ret = ocfs2_journal_access(handle, inode, wc->w_di_bh, | |
1738 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1739 | if (ret) { | |
9517bac6 MF |
1740 | mlog_errno(ret); |
1741 | goto out_commit; | |
1742 | } | |
1743 | ||
3a307ffc MF |
1744 | /* |
1745 | * Fill our page array first. That way we've grabbed enough so | |
1746 | * that we can zero and flush if we error after adding the | |
1747 | * extent. | |
1748 | */ | |
1749 | ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, | |
b27b7cbc MF |
1750 | clusters_to_alloc + extents_to_split, |
1751 | mmap_page); | |
9517bac6 MF |
1752 | if (ret) { |
1753 | mlog_errno(ret); | |
1754 | goto out_commit; | |
1755 | } | |
1756 | ||
0d172baa MF |
1757 | ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos, |
1758 | len); | |
1759 | if (ret) { | |
1760 | mlog_errno(ret); | |
1761 | goto out_commit; | |
9517bac6 | 1762 | } |
9517bac6 | 1763 | |
3a307ffc MF |
1764 | if (data_ac) |
1765 | ocfs2_free_alloc_context(data_ac); | |
1766 | if (meta_ac) | |
1767 | ocfs2_free_alloc_context(meta_ac); | |
9517bac6 | 1768 | |
1afc32b9 | 1769 | success: |
3a307ffc MF |
1770 | *pagep = wc->w_target_page; |
1771 | *fsdata = wc; | |
1772 | return 0; | |
9517bac6 MF |
1773 | out_commit: |
1774 | ocfs2_commit_trans(osb, handle); | |
1775 | ||
9517bac6 | 1776 | out: |
3a307ffc MF |
1777 | ocfs2_free_write_ctxt(wc); |
1778 | ||
9517bac6 MF |
1779 | if (data_ac) |
1780 | ocfs2_free_alloc_context(data_ac); | |
1781 | if (meta_ac) | |
1782 | ocfs2_free_alloc_context(meta_ac); | |
3a307ffc MF |
1783 | return ret; |
1784 | } | |
1785 | ||
b6af1bcd NP |
1786 | static int ocfs2_write_begin(struct file *file, struct address_space *mapping, |
1787 | loff_t pos, unsigned len, unsigned flags, | |
1788 | struct page **pagep, void **fsdata) | |
607d44aa MF |
1789 | { |
1790 | int ret; | |
1791 | struct buffer_head *di_bh = NULL; | |
1792 | struct inode *inode = mapping->host; | |
1793 | ||
e63aecb6 | 1794 | ret = ocfs2_inode_lock(inode, &di_bh, 1); |
607d44aa MF |
1795 | if (ret) { |
1796 | mlog_errno(ret); | |
1797 | return ret; | |
1798 | } | |
1799 | ||
1800 | /* | |
1801 | * Take alloc sem here to prevent concurrent lookups. That way | |
1802 | * the mapping, zeroing and tree manipulation within | |
1803 | * ocfs2_write() will be safe against ->readpage(). This | |
1804 | * should also serve to lock out allocation from a shared | |
1805 | * writeable region. | |
1806 | */ | |
1807 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1808 | ||
607d44aa | 1809 | ret = ocfs2_write_begin_nolock(mapping, pos, len, flags, pagep, |
7307de80 | 1810 | fsdata, di_bh, NULL); |
607d44aa MF |
1811 | if (ret) { |
1812 | mlog_errno(ret); | |
c934a92d | 1813 | goto out_fail; |
607d44aa MF |
1814 | } |
1815 | ||
1816 | brelse(di_bh); | |
1817 | ||
1818 | return 0; | |
1819 | ||
607d44aa MF |
1820 | out_fail: |
1821 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
1822 | ||
1823 | brelse(di_bh); | |
e63aecb6 | 1824 | ocfs2_inode_unlock(inode, 1); |
607d44aa MF |
1825 | |
1826 | return ret; | |
1827 | } | |
1828 | ||
1afc32b9 MF |
1829 | static void ocfs2_write_end_inline(struct inode *inode, loff_t pos, |
1830 | unsigned len, unsigned *copied, | |
1831 | struct ocfs2_dinode *di, | |
1832 | struct ocfs2_write_ctxt *wc) | |
1833 | { | |
1834 | void *kaddr; | |
1835 | ||
1836 | if (unlikely(*copied < len)) { | |
1837 | if (!PageUptodate(wc->w_target_page)) { | |
1838 | *copied = 0; | |
1839 | return; | |
1840 | } | |
1841 | } | |
1842 | ||
1843 | kaddr = kmap_atomic(wc->w_target_page, KM_USER0); | |
1844 | memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied); | |
1845 | kunmap_atomic(kaddr, KM_USER0); | |
1846 | ||
1847 | mlog(0, "Data written to inode at offset %llu. " | |
1848 | "id_count = %u, copied = %u, i_dyn_features = 0x%x\n", | |
1849 | (unsigned long long)pos, *copied, | |
1850 | le16_to_cpu(di->id2.i_data.id_count), | |
1851 | le16_to_cpu(di->i_dyn_features)); | |
1852 | } | |
1853 | ||
7307de80 MF |
1854 | int ocfs2_write_end_nolock(struct address_space *mapping, |
1855 | loff_t pos, unsigned len, unsigned copied, | |
1856 | struct page *page, void *fsdata) | |
3a307ffc MF |
1857 | { |
1858 | int i; | |
1859 | unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1); | |
1860 | struct inode *inode = mapping->host; | |
1861 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1862 | struct ocfs2_write_ctxt *wc = fsdata; | |
1863 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; | |
1864 | handle_t *handle = wc->w_handle; | |
1865 | struct page *tmppage; | |
1866 | ||
1afc32b9 MF |
1867 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
1868 | ocfs2_write_end_inline(inode, pos, len, &copied, di, wc); | |
1869 | goto out_write_size; | |
1870 | } | |
1871 | ||
3a307ffc MF |
1872 | if (unlikely(copied < len)) { |
1873 | if (!PageUptodate(wc->w_target_page)) | |
1874 | copied = 0; | |
1875 | ||
1876 | ocfs2_zero_new_buffers(wc->w_target_page, start+copied, | |
1877 | start+len); | |
1878 | } | |
1879 | flush_dcache_page(wc->w_target_page); | |
1880 | ||
1881 | for(i = 0; i < wc->w_num_pages; i++) { | |
1882 | tmppage = wc->w_pages[i]; | |
1883 | ||
1884 | if (tmppage == wc->w_target_page) { | |
1885 | from = wc->w_target_from; | |
1886 | to = wc->w_target_to; | |
1887 | ||
1888 | BUG_ON(from > PAGE_CACHE_SIZE || | |
1889 | to > PAGE_CACHE_SIZE || | |
1890 | to < from); | |
1891 | } else { | |
1892 | /* | |
1893 | * Pages adjacent to the target (if any) imply | |
1894 | * a hole-filling write in which case we want | |
1895 | * to flush their entire range. | |
1896 | */ | |
1897 | from = 0; | |
1898 | to = PAGE_CACHE_SIZE; | |
1899 | } | |
1900 | ||
961cecbe | 1901 | if (page_has_buffers(tmppage)) { |
53ef99ca | 1902 | if (ocfs2_should_order_data(inode)) |
2b4e30fb | 1903 | ocfs2_jbd2_file_inode(wc->w_handle, inode); |
961cecbe SM |
1904 | block_commit_write(tmppage, from, to); |
1905 | } | |
3a307ffc MF |
1906 | } |
1907 | ||
1afc32b9 | 1908 | out_write_size: |
3a307ffc MF |
1909 | pos += copied; |
1910 | if (pos > inode->i_size) { | |
1911 | i_size_write(inode, pos); | |
1912 | mark_inode_dirty(inode); | |
1913 | } | |
1914 | inode->i_blocks = ocfs2_inode_sector_count(inode); | |
1915 | di->i_size = cpu_to_le64((u64)i_size_read(inode)); | |
1916 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
1917 | di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); | |
1918 | di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
3a307ffc MF |
1919 | ocfs2_journal_dirty(handle, wc->w_di_bh); |
1920 | ||
1921 | ocfs2_commit_trans(osb, handle); | |
59a5e416 | 1922 | |
b27b7cbc MF |
1923 | ocfs2_run_deallocs(osb, &wc->w_dealloc); |
1924 | ||
607d44aa MF |
1925 | ocfs2_free_write_ctxt(wc); |
1926 | ||
1927 | return copied; | |
1928 | } | |
1929 | ||
b6af1bcd NP |
1930 | static int ocfs2_write_end(struct file *file, struct address_space *mapping, |
1931 | loff_t pos, unsigned len, unsigned copied, | |
1932 | struct page *page, void *fsdata) | |
607d44aa MF |
1933 | { |
1934 | int ret; | |
1935 | struct inode *inode = mapping->host; | |
1936 | ||
1937 | ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata); | |
1938 | ||
3a307ffc | 1939 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
e63aecb6 | 1940 | ocfs2_inode_unlock(inode, 1); |
9517bac6 | 1941 | |
607d44aa | 1942 | return ret; |
9517bac6 MF |
1943 | } |
1944 | ||
f5e54d6e | 1945 | const struct address_space_operations ocfs2_aops = { |
ccd979bd | 1946 | .readpage = ocfs2_readpage, |
628a24f5 | 1947 | .readpages = ocfs2_readpages, |
ccd979bd | 1948 | .writepage = ocfs2_writepage, |
b6af1bcd NP |
1949 | .write_begin = ocfs2_write_begin, |
1950 | .write_end = ocfs2_write_end, | |
ccd979bd MF |
1951 | .bmap = ocfs2_bmap, |
1952 | .sync_page = block_sync_page, | |
03f981cf JB |
1953 | .direct_IO = ocfs2_direct_IO, |
1954 | .invalidatepage = ocfs2_invalidatepage, | |
1955 | .releasepage = ocfs2_releasepage, | |
1956 | .migratepage = buffer_migrate_page, | |
ccd979bd | 1957 | }; |