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Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3 | * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. | |
4 | * | |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
7 | * of the GNU General Public License v.2. | |
8 | */ | |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/buffer_head.h> | |
15 | #include <linux/pagemap.h> | |
9b124fbb | 16 | #include <linux/mpage.h> |
d1665e41 | 17 | #include <linux/fs.h> |
b3b94faa DT |
18 | #include <asm/semaphore.h> |
19 | ||
20 | #include "gfs2.h" | |
21 | #include "bmap.h" | |
22 | #include "glock.h" | |
23 | #include "inode.h" | |
b3b94faa DT |
24 | #include "log.h" |
25 | #include "meta_io.h" | |
26 | #include "ops_address.h" | |
27 | #include "page.h" | |
28 | #include "quota.h" | |
29 | #include "trans.h" | |
18ec7d5c | 30 | #include "rgrp.h" |
61a30dcb | 31 | #include "ops_file.h" |
b3b94faa DT |
32 | |
33 | /** | |
4ff14670 | 34 | * gfs2_get_block - Fills in a buffer head with details about a block |
b3b94faa DT |
35 | * @inode: The inode |
36 | * @lblock: The block number to look up | |
37 | * @bh_result: The buffer head to return the result in | |
38 | * @create: Non-zero if we may add block to the file | |
39 | * | |
40 | * Returns: errno | |
41 | */ | |
42 | ||
4ff14670 SW |
43 | int gfs2_get_block(struct inode *inode, sector_t lblock, |
44 | struct buffer_head *bh_result, int create) | |
b3b94faa DT |
45 | { |
46 | struct gfs2_inode *ip = get_v2ip(inode); | |
47 | int new = create; | |
48 | uint64_t dblock; | |
49 | int error; | |
50 | ||
51 | error = gfs2_block_map(ip, lblock, &new, &dblock, NULL); | |
52 | if (error) | |
53 | return error; | |
54 | ||
55 | if (!dblock) | |
56 | return 0; | |
57 | ||
58 | map_bh(bh_result, inode->i_sb, dblock); | |
59 | if (new) | |
60 | set_buffer_new(bh_result); | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | /** | |
66 | * get_block_noalloc - Fills in a buffer head with details about a block | |
67 | * @inode: The inode | |
68 | * @lblock: The block number to look up | |
69 | * @bh_result: The buffer head to return the result in | |
70 | * @create: Non-zero if we may add block to the file | |
71 | * | |
72 | * Returns: errno | |
73 | */ | |
74 | ||
75 | static int get_block_noalloc(struct inode *inode, sector_t lblock, | |
76 | struct buffer_head *bh_result, int create) | |
77 | { | |
78 | struct gfs2_inode *ip = get_v2ip(inode); | |
79 | int new = 0; | |
80 | uint64_t dblock; | |
81 | int error; | |
82 | ||
83 | error = gfs2_block_map(ip, lblock, &new, &dblock, NULL); | |
84 | if (error) | |
85 | return error; | |
86 | ||
87 | if (dblock) | |
88 | map_bh(bh_result, inode->i_sb, dblock); | |
89 | else if (gfs2_assert_withdraw(ip->i_sbd, !create)) | |
90 | error = -EIO; | |
91 | ||
92 | return error; | |
93 | } | |
94 | ||
95 | static int get_blocks(struct inode *inode, sector_t lblock, | |
96 | unsigned long max_blocks, struct buffer_head *bh_result, | |
97 | int create) | |
98 | { | |
99 | struct gfs2_inode *ip = get_v2ip(inode); | |
100 | int new = create; | |
101 | uint64_t dblock; | |
102 | uint32_t extlen; | |
103 | int error; | |
104 | ||
105 | error = gfs2_block_map(ip, lblock, &new, &dblock, &extlen); | |
106 | if (error) | |
107 | return error; | |
108 | ||
109 | if (!dblock) | |
110 | return 0; | |
111 | ||
112 | map_bh(bh_result, inode->i_sb, dblock); | |
113 | if (new) | |
114 | set_buffer_new(bh_result); | |
115 | ||
116 | if (extlen > max_blocks) | |
117 | extlen = max_blocks; | |
118 | bh_result->b_size = extlen << inode->i_blkbits; | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static int get_blocks_noalloc(struct inode *inode, sector_t lblock, | |
124 | unsigned long max_blocks, | |
125 | struct buffer_head *bh_result, int create) | |
126 | { | |
127 | struct gfs2_inode *ip = get_v2ip(inode); | |
128 | int new = 0; | |
129 | uint64_t dblock; | |
130 | uint32_t extlen; | |
131 | int error; | |
132 | ||
133 | error = gfs2_block_map(ip, lblock, &new, &dblock, &extlen); | |
134 | if (error) | |
135 | return error; | |
136 | ||
137 | if (dblock) { | |
138 | map_bh(bh_result, inode->i_sb, dblock); | |
139 | if (extlen > max_blocks) | |
140 | extlen = max_blocks; | |
141 | bh_result->b_size = extlen << inode->i_blkbits; | |
142 | } else if (gfs2_assert_withdraw(ip->i_sbd, !create)) | |
143 | error = -EIO; | |
144 | ||
145 | return error; | |
146 | } | |
147 | ||
148 | /** | |
149 | * gfs2_writepage - Write complete page | |
150 | * @page: Page to write | |
151 | * | |
152 | * Returns: errno | |
153 | * | |
18ec7d5c SW |
154 | * Some of this is copied from block_write_full_page() although we still |
155 | * call it to do most of the work. | |
b3b94faa DT |
156 | */ |
157 | ||
158 | static int gfs2_writepage(struct page *page, struct writeback_control *wbc) | |
159 | { | |
18ec7d5c | 160 | struct inode *inode = page->mapping->host; |
b3b94faa DT |
161 | struct gfs2_inode *ip = get_v2ip(page->mapping->host); |
162 | struct gfs2_sbd *sdp = ip->i_sbd; | |
18ec7d5c SW |
163 | loff_t i_size = i_size_read(inode); |
164 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
165 | unsigned offset; | |
b3b94faa | 166 | int error; |
18ec7d5c | 167 | int done_trans = 0; |
b3b94faa | 168 | |
b3b94faa DT |
169 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) { |
170 | unlock_page(page); | |
171 | return -EIO; | |
172 | } | |
18ec7d5c SW |
173 | if (get_transaction) |
174 | goto out_ignore; | |
175 | ||
176 | /* Is the page fully outside i_size? (truncate in progress) */ | |
177 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
178 | if (page->index >= end_index+1 || !offset) { | |
179 | page->mapping->a_ops->invalidatepage(page, 0); | |
b3b94faa | 180 | unlock_page(page); |
18ec7d5c | 181 | return 0; /* don't care */ |
b3b94faa DT |
182 | } |
183 | ||
18ec7d5c SW |
184 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) { |
185 | error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0); | |
186 | if (error) | |
187 | goto out_ignore; | |
188 | gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); | |
189 | done_trans = 1; | |
190 | } | |
18ec7d5c SW |
191 | error = block_write_full_page(page, get_block_noalloc, wbc); |
192 | if (done_trans) | |
193 | gfs2_trans_end(sdp); | |
b3b94faa | 194 | gfs2_meta_cache_flush(ip); |
b3b94faa | 195 | return error; |
18ec7d5c SW |
196 | |
197 | out_ignore: | |
198 | redirty_page_for_writepage(wbc, page); | |
199 | unlock_page(page); | |
200 | return 0; | |
b3b94faa DT |
201 | } |
202 | ||
203 | /** | |
204 | * stuffed_readpage - Fill in a Linux page with stuffed file data | |
205 | * @ip: the inode | |
206 | * @page: the page | |
207 | * | |
208 | * Returns: errno | |
209 | */ | |
210 | ||
211 | static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) | |
212 | { | |
213 | struct buffer_head *dibh; | |
214 | void *kaddr; | |
215 | int error; | |
216 | ||
217 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
218 | if (error) | |
219 | return error; | |
220 | ||
5c4e9e03 | 221 | kaddr = kmap_atomic(page, KM_USER0); |
b3b94faa DT |
222 | memcpy((char *)kaddr, |
223 | dibh->b_data + sizeof(struct gfs2_dinode), | |
224 | ip->i_di.di_size); | |
225 | memset((char *)kaddr + ip->i_di.di_size, | |
226 | 0, | |
227 | PAGE_CACHE_SIZE - ip->i_di.di_size); | |
5c4e9e03 | 228 | kunmap_atomic(page, KM_USER0); |
b3b94faa DT |
229 | |
230 | brelse(dibh); | |
231 | ||
232 | SetPageUptodate(page); | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | static int zero_readpage(struct page *page) | |
238 | { | |
239 | void *kaddr; | |
240 | ||
5c4e9e03 | 241 | kaddr = kmap_atomic(page, KM_USER0); |
b3b94faa | 242 | memset(kaddr, 0, PAGE_CACHE_SIZE); |
5c4e9e03 | 243 | kunmap_atomic(page, KM_USER0); |
b3b94faa DT |
244 | |
245 | SetPageUptodate(page); | |
246 | unlock_page(page); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
b3b94faa DT |
251 | /** |
252 | * gfs2_readpage - readpage with locking | |
18ec7d5c SW |
253 | * @file: The file to read a page for. N.B. This may be NULL if we are |
254 | * reading an internal file. | |
b3b94faa DT |
255 | * @page: The page to read |
256 | * | |
257 | * Returns: errno | |
258 | */ | |
259 | ||
260 | static int gfs2_readpage(struct file *file, struct page *page) | |
261 | { | |
262 | struct gfs2_inode *ip = get_v2ip(page->mapping->host); | |
263 | struct gfs2_sbd *sdp = ip->i_sbd; | |
18ec7d5c | 264 | struct gfs2_holder gh; |
b3b94faa DT |
265 | int error; |
266 | ||
61a30dcb SW |
267 | if (file != &gfs2_internal_file_sentinal) { |
268 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); | |
269 | error = gfs2_glock_nq_m_atime(1, &gh); | |
270 | if (error) | |
271 | goto out_unlock; | |
272 | } | |
b3b94faa | 273 | |
18ec7d5c SW |
274 | if (gfs2_is_stuffed(ip)) { |
275 | if (!page->index) { | |
276 | error = stuffed_readpage(ip, page); | |
277 | unlock_page(page); | |
b3b94faa | 278 | } else |
18ec7d5c | 279 | error = zero_readpage(page); |
b3b94faa | 280 | } else |
18ec7d5c | 281 | error = mpage_readpage(page, gfs2_get_block); |
b3b94faa DT |
282 | |
283 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
284 | error = -EIO; | |
285 | ||
61a30dcb SW |
286 | if (file != &gfs2_internal_file_sentinal) { |
287 | gfs2_glock_dq_m(1, &gh); | |
288 | gfs2_holder_uninit(&gh); | |
289 | } | |
18ec7d5c | 290 | out: |
b3b94faa | 291 | return error; |
18ec7d5c SW |
292 | out_unlock: |
293 | unlock_page(page); | |
294 | goto out; | |
b3b94faa DT |
295 | } |
296 | ||
297 | /** | |
298 | * gfs2_prepare_write - Prepare to write a page to a file | |
299 | * @file: The file to write to | |
300 | * @page: The page which is to be prepared for writing | |
301 | * @from: From (byte range within page) | |
302 | * @to: To (byte range within page) | |
303 | * | |
304 | * Returns: errno | |
305 | */ | |
306 | ||
307 | static int gfs2_prepare_write(struct file *file, struct page *page, | |
308 | unsigned from, unsigned to) | |
309 | { | |
310 | struct gfs2_inode *ip = get_v2ip(page->mapping->host); | |
311 | struct gfs2_sbd *sdp = ip->i_sbd; | |
18ec7d5c SW |
312 | unsigned int data_blocks, ind_blocks, rblocks; |
313 | int alloc_required; | |
b3b94faa | 314 | int error = 0; |
18ec7d5c SW |
315 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + from; |
316 | loff_t end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
317 | struct gfs2_alloc *al; | |
b3b94faa | 318 | |
18ec7d5c SW |
319 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME, &ip->i_gh); |
320 | error = gfs2_glock_nq_m_atime(1, &ip->i_gh); | |
321 | if (error) | |
322 | goto out_uninit; | |
b3b94faa | 323 | |
18ec7d5c SW |
324 | gfs2_write_calc_reserv(ip, to - from, &data_blocks, &ind_blocks); |
325 | ||
326 | error = gfs2_write_alloc_required(ip, pos, from - to, &alloc_required); | |
327 | if (error) | |
328 | goto out_unlock; | |
b3b94faa | 329 | |
18ec7d5c SW |
330 | |
331 | if (alloc_required) { | |
332 | al = gfs2_alloc_get(ip); | |
333 | ||
334 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
335 | if (error) | |
336 | goto out_alloc_put; | |
337 | ||
338 | error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid); | |
339 | if (error) | |
340 | goto out_qunlock; | |
341 | ||
342 | al->al_requested = data_blocks + ind_blocks; | |
343 | error = gfs2_inplace_reserve(ip); | |
344 | if (error) | |
345 | goto out_qunlock; | |
346 | } | |
347 | ||
348 | rblocks = RES_DINODE + ind_blocks; | |
349 | if (gfs2_is_jdata(ip)) | |
350 | rblocks += data_blocks ? data_blocks : 1; | |
351 | if (ind_blocks || data_blocks) | |
352 | rblocks += RES_STATFS + RES_QUOTA; | |
353 | ||
354 | error = gfs2_trans_begin(sdp, rblocks, 0); | |
355 | if (error) | |
356 | goto out; | |
357 | ||
358 | if (gfs2_is_stuffed(ip)) { | |
359 | if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { | |
568f4c96 SW |
360 | error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page, |
361 | page); | |
5c4e9e03 SW |
362 | if (error == 0) |
363 | goto prepare_write; | |
364 | } else if (!PageUptodate(page)) | |
b3b94faa | 365 | error = stuffed_readpage(ip, page); |
5c4e9e03 | 366 | goto out; |
18ec7d5c SW |
367 | } |
368 | ||
5c4e9e03 | 369 | prepare_write: |
18ec7d5c SW |
370 | error = block_prepare_write(page, from, to, gfs2_get_block); |
371 | ||
372 | out: | |
373 | if (error) { | |
374 | gfs2_trans_end(sdp); | |
375 | if (alloc_required) { | |
376 | gfs2_inplace_release(ip); | |
377 | out_qunlock: | |
378 | gfs2_quota_unlock(ip); | |
379 | out_alloc_put: | |
380 | gfs2_alloc_put(ip); | |
381 | } | |
382 | out_unlock: | |
383 | gfs2_glock_dq_m(1, &ip->i_gh); | |
384 | out_uninit: | |
385 | gfs2_holder_uninit(&ip->i_gh); | |
386 | } | |
b3b94faa DT |
387 | |
388 | return error; | |
389 | } | |
390 | ||
391 | /** | |
392 | * gfs2_commit_write - Commit write to a file | |
393 | * @file: The file to write to | |
394 | * @page: The page containing the data | |
395 | * @from: From (byte range within page) | |
396 | * @to: To (byte range within page) | |
397 | * | |
398 | * Returns: errno | |
399 | */ | |
400 | ||
401 | static int gfs2_commit_write(struct file *file, struct page *page, | |
402 | unsigned from, unsigned to) | |
403 | { | |
404 | struct inode *inode = page->mapping->host; | |
405 | struct gfs2_inode *ip = get_v2ip(inode); | |
406 | struct gfs2_sbd *sdp = ip->i_sbd; | |
18ec7d5c SW |
407 | int error = -EOPNOTSUPP; |
408 | struct buffer_head *dibh; | |
409 | struct gfs2_alloc *al = &ip->i_alloc;; | |
b3b94faa | 410 | |
18ec7d5c SW |
411 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_locked_by_me(ip->i_gl))) |
412 | goto fail_nounlock; | |
413 | ||
414 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
415 | if (error) | |
416 | goto fail_endtrans; | |
417 | ||
418 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
419 | ||
b3b94faa | 420 | if (gfs2_is_stuffed(ip)) { |
b3b94faa DT |
421 | uint64_t file_size; |
422 | void *kaddr; | |
423 | ||
424 | file_size = ((uint64_t)page->index << PAGE_CACHE_SHIFT) + to; | |
425 | ||
18ec7d5c | 426 | kaddr = kmap_atomic(page, KM_USER0); |
b3b94faa | 427 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode) + from, |
18ec7d5c SW |
428 | (char *)kaddr + from, to - from); |
429 | kunmap_atomic(page, KM_USER0); | |
b3b94faa DT |
430 | |
431 | SetPageUptodate(page); | |
432 | ||
433 | if (inode->i_size < file_size) | |
434 | i_size_write(inode, file_size); | |
435 | } else { | |
568f4c96 SW |
436 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || |
437 | gfs2_is_jdata(ip)) | |
257f9b4e | 438 | gfs2_page_add_databufs(ip, page, from, to); |
b3b94faa DT |
439 | error = generic_commit_write(file, page, from, to); |
440 | if (error) | |
441 | goto fail; | |
442 | } | |
443 | ||
18ec7d5c SW |
444 | if (ip->i_di.di_size < inode->i_size) |
445 | ip->i_di.di_size = inode->i_size; | |
446 | ||
447 | gfs2_dinode_out(&ip->i_di, dibh->b_data); | |
448 | brelse(dibh); | |
449 | gfs2_trans_end(sdp); | |
450 | if (al->al_requested) { | |
451 | gfs2_inplace_release(ip); | |
452 | gfs2_quota_unlock(ip); | |
453 | gfs2_alloc_put(ip); | |
454 | } | |
455 | gfs2_glock_dq_m(1, &ip->i_gh); | |
456 | gfs2_holder_uninit(&ip->i_gh); | |
b3b94faa DT |
457 | return 0; |
458 | ||
18ec7d5c SW |
459 | fail: |
460 | brelse(dibh); | |
461 | fail_endtrans: | |
462 | gfs2_trans_end(sdp); | |
463 | if (al->al_requested) { | |
464 | gfs2_inplace_release(ip); | |
465 | gfs2_quota_unlock(ip); | |
466 | gfs2_alloc_put(ip); | |
467 | } | |
468 | gfs2_glock_dq_m(1, &ip->i_gh); | |
469 | gfs2_holder_uninit(&ip->i_gh); | |
470 | fail_nounlock: | |
b3b94faa | 471 | ClearPageUptodate(page); |
b3b94faa DT |
472 | return error; |
473 | } | |
474 | ||
475 | /** | |
476 | * gfs2_bmap - Block map function | |
477 | * @mapping: Address space info | |
478 | * @lblock: The block to map | |
479 | * | |
480 | * Returns: The disk address for the block or 0 on hole or error | |
481 | */ | |
482 | ||
483 | static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) | |
484 | { | |
485 | struct gfs2_inode *ip = get_v2ip(mapping->host); | |
486 | struct gfs2_holder i_gh; | |
487 | sector_t dblock = 0; | |
488 | int error; | |
489 | ||
b3b94faa DT |
490 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
491 | if (error) | |
492 | return 0; | |
493 | ||
494 | if (!gfs2_is_stuffed(ip)) | |
4ff14670 | 495 | dblock = generic_block_bmap(mapping, lblock, gfs2_get_block); |
b3b94faa DT |
496 | |
497 | gfs2_glock_dq_uninit(&i_gh); | |
498 | ||
499 | return dblock; | |
500 | } | |
501 | ||
502 | static void discard_buffer(struct gfs2_sbd *sdp, struct buffer_head *bh) | |
503 | { | |
64fb4eb7 | 504 | struct gfs2_bufdata *bd; |
b3b94faa DT |
505 | |
506 | gfs2_log_lock(sdp); | |
64fb4eb7 SW |
507 | bd = get_v2bd(bh); |
508 | if (bd) { | |
509 | bd->bd_bh = NULL; | |
510 | set_v2bd(bh, NULL); | |
b3b94faa DT |
511 | gfs2_log_unlock(sdp); |
512 | brelse(bh); | |
513 | } else | |
514 | gfs2_log_unlock(sdp); | |
515 | ||
516 | lock_buffer(bh); | |
517 | clear_buffer_dirty(bh); | |
518 | bh->b_bdev = NULL; | |
519 | clear_buffer_mapped(bh); | |
520 | clear_buffer_req(bh); | |
521 | clear_buffer_new(bh); | |
522 | clear_buffer_delay(bh); | |
523 | unlock_buffer(bh); | |
524 | } | |
525 | ||
526 | static int gfs2_invalidatepage(struct page *page, unsigned long offset) | |
527 | { | |
528 | struct gfs2_sbd *sdp = get_v2sdp(page->mapping->host->i_sb); | |
529 | struct buffer_head *head, *bh, *next; | |
530 | unsigned int curr_off = 0; | |
531 | int ret = 1; | |
532 | ||
533 | BUG_ON(!PageLocked(page)); | |
534 | if (!page_has_buffers(page)) | |
535 | return 1; | |
536 | ||
537 | bh = head = page_buffers(page); | |
538 | do { | |
539 | unsigned int next_off = curr_off + bh->b_size; | |
540 | next = bh->b_this_page; | |
541 | ||
542 | if (offset <= curr_off) | |
543 | discard_buffer(sdp, bh); | |
544 | ||
545 | curr_off = next_off; | |
546 | bh = next; | |
547 | } while (bh != head); | |
548 | ||
549 | if (!offset) | |
550 | ret = try_to_release_page(page, 0); | |
551 | ||
552 | return ret; | |
553 | } | |
554 | ||
d1665e41 SW |
555 | static ssize_t gfs2_direct_IO_write(struct kiocb *iocb, const struct iovec *iov, |
556 | loff_t offset, unsigned long nr_segs) | |
557 | { | |
558 | struct file *file = iocb->ki_filp; | |
559 | struct inode *inode = file->f_mapping->host; | |
560 | struct gfs2_inode *ip = get_v2ip(inode); | |
561 | struct gfs2_holder gh; | |
562 | int rv; | |
563 | ||
564 | /* | |
565 | * Shared lock, even though its write, since we do no allocation | |
566 | * on this path. All we need change is atime. | |
567 | */ | |
568 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); | |
569 | rv = gfs2_glock_nq_m_atime(1, &gh); | |
570 | if (rv) | |
571 | goto out; | |
572 | ||
573 | /* | |
574 | * Should we return an error here? I can't see that O_DIRECT for | |
575 | * a journaled file makes any sense. For now we'll silently fall | |
576 | * back to buffered I/O, likewise we do the same for stuffed | |
577 | * files since they are (a) small and (b) unaligned. | |
578 | */ | |
579 | if (gfs2_is_jdata(ip)) | |
580 | goto out; | |
581 | ||
582 | if (gfs2_is_stuffed(ip)) | |
583 | goto out; | |
584 | ||
585 | rv = __blockdev_direct_IO(WRITE, iocb, inode, inode->i_sb->s_bdev, | |
586 | iov, offset, nr_segs, get_blocks_noalloc, | |
587 | NULL, DIO_OWN_LOCKING); | |
588 | out: | |
589 | gfs2_glock_dq_m(1, &gh); | |
590 | gfs2_holder_uninit(&gh); | |
591 | ||
592 | return rv; | |
593 | } | |
594 | ||
595 | /** | |
596 | * gfs2_direct_IO | |
597 | * | |
598 | * This is called with a shared lock already held for the read path. | |
599 | * Currently, no locks are held when the write path is called. | |
600 | */ | |
601 | static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, | |
602 | const struct iovec *iov, loff_t offset, | |
603 | unsigned long nr_segs) | |
b3b94faa DT |
604 | { |
605 | struct file *file = iocb->ki_filp; | |
606 | struct inode *inode = file->f_mapping->host; | |
607 | struct gfs2_inode *ip = get_v2ip(inode); | |
608 | struct gfs2_sbd *sdp = ip->i_sbd; | |
b3b94faa | 609 | |
d1665e41 SW |
610 | if (rw == WRITE) |
611 | return gfs2_direct_IO_write(iocb, iov, offset, nr_segs); | |
b3b94faa | 612 | |
d1665e41 SW |
613 | if (gfs2_assert_warn(sdp, gfs2_glock_is_locked_by_me(ip->i_gl)) || |
614 | gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip))) | |
615 | return -EINVAL; | |
b3b94faa | 616 | |
d1665e41 SW |
617 | return __blockdev_direct_IO(READ, iocb, inode, inode->i_sb->s_bdev, iov, |
618 | offset, nr_segs, get_blocks, NULL, | |
619 | DIO_OWN_LOCKING); | |
b3b94faa DT |
620 | } |
621 | ||
622 | struct address_space_operations gfs2_file_aops = { | |
623 | .writepage = gfs2_writepage, | |
624 | .readpage = gfs2_readpage, | |
625 | .sync_page = block_sync_page, | |
626 | .prepare_write = gfs2_prepare_write, | |
627 | .commit_write = gfs2_commit_write, | |
628 | .bmap = gfs2_bmap, | |
629 | .invalidatepage = gfs2_invalidatepage, | |
630 | .direct_IO = gfs2_direct_IO, | |
631 | }; | |
632 |