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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> |
5c676f6d | 18 | #include <linux/gfs2_ondisk.h> |
b3b94faa DT |
19 | #include <asm/semaphore.h> |
20 | ||
21 | #include "gfs2.h" | |
5c676f6d SW |
22 | #include "lm_interface.h" |
23 | #include "incore.h" | |
b3b94faa DT |
24 | #include "bmap.h" |
25 | #include "glock.h" | |
26 | #include "inode.h" | |
b3b94faa DT |
27 | #include "log.h" |
28 | #include "meta_io.h" | |
29 | #include "ops_address.h" | |
30 | #include "page.h" | |
31 | #include "quota.h" | |
32 | #include "trans.h" | |
18ec7d5c | 33 | #include "rgrp.h" |
61a30dcb | 34 | #include "ops_file.h" |
5c676f6d | 35 | #include "util.h" |
b3b94faa DT |
36 | |
37 | /** | |
4ff14670 | 38 | * gfs2_get_block - Fills in a buffer head with details about a block |
b3b94faa DT |
39 | * @inode: The inode |
40 | * @lblock: The block number to look up | |
41 | * @bh_result: The buffer head to return the result in | |
42 | * @create: Non-zero if we may add block to the file | |
43 | * | |
44 | * Returns: errno | |
45 | */ | |
46 | ||
4ff14670 SW |
47 | int gfs2_get_block(struct inode *inode, sector_t lblock, |
48 | struct buffer_head *bh_result, int create) | |
b3b94faa | 49 | { |
5c676f6d | 50 | struct gfs2_inode *ip = inode->u.generic_ip; |
b3b94faa DT |
51 | int new = create; |
52 | uint64_t dblock; | |
53 | int error; | |
54 | ||
55 | error = gfs2_block_map(ip, lblock, &new, &dblock, NULL); | |
56 | if (error) | |
57 | return error; | |
58 | ||
59 | if (!dblock) | |
60 | return 0; | |
61 | ||
62 | map_bh(bh_result, inode->i_sb, dblock); | |
63 | if (new) | |
64 | set_buffer_new(bh_result); | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | /** | |
70 | * get_block_noalloc - Fills in a buffer head with details about a block | |
71 | * @inode: The inode | |
72 | * @lblock: The block number to look up | |
73 | * @bh_result: The buffer head to return the result in | |
74 | * @create: Non-zero if we may add block to the file | |
75 | * | |
76 | * Returns: errno | |
77 | */ | |
78 | ||
79 | static int get_block_noalloc(struct inode *inode, sector_t lblock, | |
80 | struct buffer_head *bh_result, int create) | |
81 | { | |
5c676f6d | 82 | struct gfs2_inode *ip = inode->u.generic_ip; |
b3b94faa DT |
83 | int new = 0; |
84 | uint64_t dblock; | |
85 | int error; | |
86 | ||
87 | error = gfs2_block_map(ip, lblock, &new, &dblock, NULL); | |
88 | if (error) | |
89 | return error; | |
90 | ||
91 | if (dblock) | |
92 | map_bh(bh_result, inode->i_sb, dblock); | |
93 | else if (gfs2_assert_withdraw(ip->i_sbd, !create)) | |
94 | error = -EIO; | |
95 | ||
96 | return error; | |
97 | } | |
98 | ||
b3b94faa DT |
99 | /** |
100 | * gfs2_writepage - Write complete page | |
101 | * @page: Page to write | |
102 | * | |
103 | * Returns: errno | |
104 | * | |
18ec7d5c SW |
105 | * Some of this is copied from block_write_full_page() although we still |
106 | * call it to do most of the work. | |
b3b94faa DT |
107 | */ |
108 | ||
109 | static int gfs2_writepage(struct page *page, struct writeback_control *wbc) | |
110 | { | |
18ec7d5c | 111 | struct inode *inode = page->mapping->host; |
5c676f6d | 112 | struct gfs2_inode *ip = page->mapping->host->u.generic_ip; |
b3b94faa | 113 | struct gfs2_sbd *sdp = ip->i_sbd; |
18ec7d5c SW |
114 | loff_t i_size = i_size_read(inode); |
115 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
116 | unsigned offset; | |
b3b94faa | 117 | int error; |
18ec7d5c | 118 | int done_trans = 0; |
b3b94faa | 119 | |
b3b94faa DT |
120 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) { |
121 | unlock_page(page); | |
122 | return -EIO; | |
123 | } | |
5c676f6d | 124 | if (current->journal_info) |
18ec7d5c SW |
125 | goto out_ignore; |
126 | ||
127 | /* Is the page fully outside i_size? (truncate in progress) */ | |
128 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
d2d7b8a2 | 129 | if (page->index > end_index || (page->index == end_index && !offset)) { |
18ec7d5c | 130 | page->mapping->a_ops->invalidatepage(page, 0); |
b3b94faa | 131 | unlock_page(page); |
18ec7d5c | 132 | return 0; /* don't care */ |
b3b94faa DT |
133 | } |
134 | ||
18ec7d5c SW |
135 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) { |
136 | error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0); | |
137 | if (error) | |
138 | goto out_ignore; | |
139 | gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1); | |
140 | done_trans = 1; | |
141 | } | |
18ec7d5c SW |
142 | error = block_write_full_page(page, get_block_noalloc, wbc); |
143 | if (done_trans) | |
144 | gfs2_trans_end(sdp); | |
b3b94faa | 145 | gfs2_meta_cache_flush(ip); |
b3b94faa | 146 | return error; |
18ec7d5c SW |
147 | |
148 | out_ignore: | |
149 | redirty_page_for_writepage(wbc, page); | |
150 | unlock_page(page); | |
151 | return 0; | |
b3b94faa DT |
152 | } |
153 | ||
154 | /** | |
155 | * stuffed_readpage - Fill in a Linux page with stuffed file data | |
156 | * @ip: the inode | |
157 | * @page: the page | |
158 | * | |
159 | * Returns: errno | |
160 | */ | |
161 | ||
162 | static int stuffed_readpage(struct gfs2_inode *ip, struct page *page) | |
163 | { | |
164 | struct buffer_head *dibh; | |
165 | void *kaddr; | |
166 | int error; | |
167 | ||
168 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
169 | if (error) | |
170 | return error; | |
171 | ||
5c4e9e03 | 172 | kaddr = kmap_atomic(page, KM_USER0); |
b3b94faa DT |
173 | memcpy((char *)kaddr, |
174 | dibh->b_data + sizeof(struct gfs2_dinode), | |
175 | ip->i_di.di_size); | |
176 | memset((char *)kaddr + ip->i_di.di_size, | |
177 | 0, | |
178 | PAGE_CACHE_SIZE - ip->i_di.di_size); | |
5c4e9e03 | 179 | kunmap_atomic(page, KM_USER0); |
b3b94faa DT |
180 | |
181 | brelse(dibh); | |
182 | ||
183 | SetPageUptodate(page); | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | static int zero_readpage(struct page *page) | |
189 | { | |
190 | void *kaddr; | |
191 | ||
5c4e9e03 | 192 | kaddr = kmap_atomic(page, KM_USER0); |
b3b94faa | 193 | memset(kaddr, 0, PAGE_CACHE_SIZE); |
5c4e9e03 | 194 | kunmap_atomic(page, KM_USER0); |
b3b94faa DT |
195 | |
196 | SetPageUptodate(page); | |
197 | unlock_page(page); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
b3b94faa DT |
202 | /** |
203 | * gfs2_readpage - readpage with locking | |
18ec7d5c SW |
204 | * @file: The file to read a page for. N.B. This may be NULL if we are |
205 | * reading an internal file. | |
b3b94faa DT |
206 | * @page: The page to read |
207 | * | |
208 | * Returns: errno | |
209 | */ | |
210 | ||
211 | static int gfs2_readpage(struct file *file, struct page *page) | |
212 | { | |
5c676f6d | 213 | struct gfs2_inode *ip = page->mapping->host->u.generic_ip; |
b3b94faa | 214 | struct gfs2_sbd *sdp = ip->i_sbd; |
18ec7d5c | 215 | struct gfs2_holder gh; |
b3b94faa DT |
216 | int error; |
217 | ||
61a30dcb | 218 | if (file != &gfs2_internal_file_sentinal) { |
fe1bdedc | 219 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|GL_AOP, &gh); |
61a30dcb SW |
220 | error = gfs2_glock_nq_m_atime(1, &gh); |
221 | if (error) | |
222 | goto out_unlock; | |
223 | } | |
b3b94faa | 224 | |
18ec7d5c SW |
225 | if (gfs2_is_stuffed(ip)) { |
226 | if (!page->index) { | |
227 | error = stuffed_readpage(ip, page); | |
228 | unlock_page(page); | |
b3b94faa | 229 | } else |
18ec7d5c | 230 | error = zero_readpage(page); |
b3b94faa | 231 | } else |
18ec7d5c | 232 | error = mpage_readpage(page, gfs2_get_block); |
b3b94faa DT |
233 | |
234 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
235 | error = -EIO; | |
236 | ||
61a30dcb SW |
237 | if (file != &gfs2_internal_file_sentinal) { |
238 | gfs2_glock_dq_m(1, &gh); | |
239 | gfs2_holder_uninit(&gh); | |
240 | } | |
18ec7d5c | 241 | out: |
b3b94faa | 242 | return error; |
18ec7d5c SW |
243 | out_unlock: |
244 | unlock_page(page); | |
245 | goto out; | |
b3b94faa DT |
246 | } |
247 | ||
248 | /** | |
249 | * gfs2_prepare_write - Prepare to write a page to a file | |
250 | * @file: The file to write to | |
251 | * @page: The page which is to be prepared for writing | |
252 | * @from: From (byte range within page) | |
253 | * @to: To (byte range within page) | |
254 | * | |
255 | * Returns: errno | |
256 | */ | |
257 | ||
258 | static int gfs2_prepare_write(struct file *file, struct page *page, | |
259 | unsigned from, unsigned to) | |
260 | { | |
5c676f6d | 261 | struct gfs2_inode *ip = page->mapping->host->u.generic_ip; |
b3b94faa | 262 | struct gfs2_sbd *sdp = ip->i_sbd; |
18ec7d5c SW |
263 | unsigned int data_blocks, ind_blocks, rblocks; |
264 | int alloc_required; | |
b3b94faa | 265 | int error = 0; |
18ec7d5c SW |
266 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + from; |
267 | loff_t end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
268 | struct gfs2_alloc *al; | |
b3b94faa | 269 | |
fe1bdedc | 270 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME|GL_AOP, &ip->i_gh); |
18ec7d5c SW |
271 | error = gfs2_glock_nq_m_atime(1, &ip->i_gh); |
272 | if (error) | |
273 | goto out_uninit; | |
b3b94faa | 274 | |
18ec7d5c SW |
275 | gfs2_write_calc_reserv(ip, to - from, &data_blocks, &ind_blocks); |
276 | ||
277 | error = gfs2_write_alloc_required(ip, pos, from - to, &alloc_required); | |
278 | if (error) | |
279 | goto out_unlock; | |
b3b94faa | 280 | |
18ec7d5c SW |
281 | |
282 | if (alloc_required) { | |
283 | al = gfs2_alloc_get(ip); | |
284 | ||
285 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
286 | if (error) | |
287 | goto out_alloc_put; | |
288 | ||
289 | error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid); | |
290 | if (error) | |
291 | goto out_qunlock; | |
292 | ||
293 | al->al_requested = data_blocks + ind_blocks; | |
294 | error = gfs2_inplace_reserve(ip); | |
295 | if (error) | |
296 | goto out_qunlock; | |
297 | } | |
298 | ||
299 | rblocks = RES_DINODE + ind_blocks; | |
300 | if (gfs2_is_jdata(ip)) | |
301 | rblocks += data_blocks ? data_blocks : 1; | |
302 | if (ind_blocks || data_blocks) | |
303 | rblocks += RES_STATFS + RES_QUOTA; | |
304 | ||
305 | error = gfs2_trans_begin(sdp, rblocks, 0); | |
306 | if (error) | |
307 | goto out; | |
308 | ||
309 | if (gfs2_is_stuffed(ip)) { | |
310 | if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { | |
568f4c96 SW |
311 | error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page, |
312 | page); | |
5c4e9e03 SW |
313 | if (error == 0) |
314 | goto prepare_write; | |
315 | } else if (!PageUptodate(page)) | |
b3b94faa | 316 | error = stuffed_readpage(ip, page); |
5c4e9e03 | 317 | goto out; |
18ec7d5c SW |
318 | } |
319 | ||
5c4e9e03 | 320 | prepare_write: |
18ec7d5c SW |
321 | error = block_prepare_write(page, from, to, gfs2_get_block); |
322 | ||
323 | out: | |
324 | if (error) { | |
325 | gfs2_trans_end(sdp); | |
326 | if (alloc_required) { | |
327 | gfs2_inplace_release(ip); | |
328 | out_qunlock: | |
329 | gfs2_quota_unlock(ip); | |
330 | out_alloc_put: | |
331 | gfs2_alloc_put(ip); | |
332 | } | |
333 | out_unlock: | |
334 | gfs2_glock_dq_m(1, &ip->i_gh); | |
335 | out_uninit: | |
336 | gfs2_holder_uninit(&ip->i_gh); | |
337 | } | |
b3b94faa DT |
338 | |
339 | return error; | |
340 | } | |
341 | ||
342 | /** | |
343 | * gfs2_commit_write - Commit write to a file | |
344 | * @file: The file to write to | |
345 | * @page: The page containing the data | |
346 | * @from: From (byte range within page) | |
347 | * @to: To (byte range within page) | |
348 | * | |
349 | * Returns: errno | |
350 | */ | |
351 | ||
352 | static int gfs2_commit_write(struct file *file, struct page *page, | |
353 | unsigned from, unsigned to) | |
354 | { | |
355 | struct inode *inode = page->mapping->host; | |
5c676f6d | 356 | struct gfs2_inode *ip = inode->u.generic_ip; |
b3b94faa | 357 | struct gfs2_sbd *sdp = ip->i_sbd; |
18ec7d5c SW |
358 | int error = -EOPNOTSUPP; |
359 | struct buffer_head *dibh; | |
360 | struct gfs2_alloc *al = &ip->i_alloc;; | |
b3b94faa | 361 | |
18ec7d5c SW |
362 | if (gfs2_assert_withdraw(sdp, gfs2_glock_is_locked_by_me(ip->i_gl))) |
363 | goto fail_nounlock; | |
364 | ||
365 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
366 | if (error) | |
367 | goto fail_endtrans; | |
368 | ||
369 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
370 | ||
b3b94faa | 371 | if (gfs2_is_stuffed(ip)) { |
b3b94faa DT |
372 | uint64_t file_size; |
373 | void *kaddr; | |
374 | ||
375 | file_size = ((uint64_t)page->index << PAGE_CACHE_SHIFT) + to; | |
376 | ||
18ec7d5c | 377 | kaddr = kmap_atomic(page, KM_USER0); |
b3b94faa | 378 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode) + from, |
18ec7d5c SW |
379 | (char *)kaddr + from, to - from); |
380 | kunmap_atomic(page, KM_USER0); | |
b3b94faa DT |
381 | |
382 | SetPageUptodate(page); | |
383 | ||
384 | if (inode->i_size < file_size) | |
385 | i_size_write(inode, file_size); | |
386 | } else { | |
568f4c96 SW |
387 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || |
388 | gfs2_is_jdata(ip)) | |
257f9b4e | 389 | gfs2_page_add_databufs(ip, page, from, to); |
b3b94faa DT |
390 | error = generic_commit_write(file, page, from, to); |
391 | if (error) | |
392 | goto fail; | |
393 | } | |
394 | ||
18ec7d5c SW |
395 | if (ip->i_di.di_size < inode->i_size) |
396 | ip->i_di.di_size = inode->i_size; | |
397 | ||
398 | gfs2_dinode_out(&ip->i_di, dibh->b_data); | |
399 | brelse(dibh); | |
400 | gfs2_trans_end(sdp); | |
401 | if (al->al_requested) { | |
402 | gfs2_inplace_release(ip); | |
403 | gfs2_quota_unlock(ip); | |
404 | gfs2_alloc_put(ip); | |
405 | } | |
406 | gfs2_glock_dq_m(1, &ip->i_gh); | |
407 | gfs2_holder_uninit(&ip->i_gh); | |
b3b94faa DT |
408 | return 0; |
409 | ||
18ec7d5c SW |
410 | fail: |
411 | brelse(dibh); | |
412 | fail_endtrans: | |
413 | gfs2_trans_end(sdp); | |
414 | if (al->al_requested) { | |
415 | gfs2_inplace_release(ip); | |
416 | gfs2_quota_unlock(ip); | |
417 | gfs2_alloc_put(ip); | |
418 | } | |
419 | gfs2_glock_dq_m(1, &ip->i_gh); | |
420 | gfs2_holder_uninit(&ip->i_gh); | |
421 | fail_nounlock: | |
b3b94faa | 422 | ClearPageUptodate(page); |
b3b94faa DT |
423 | return error; |
424 | } | |
425 | ||
426 | /** | |
427 | * gfs2_bmap - Block map function | |
428 | * @mapping: Address space info | |
429 | * @lblock: The block to map | |
430 | * | |
431 | * Returns: The disk address for the block or 0 on hole or error | |
432 | */ | |
433 | ||
434 | static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock) | |
435 | { | |
5c676f6d | 436 | struct gfs2_inode *ip = mapping->host->u.generic_ip; |
b3b94faa DT |
437 | struct gfs2_holder i_gh; |
438 | sector_t dblock = 0; | |
439 | int error; | |
440 | ||
b3b94faa DT |
441 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
442 | if (error) | |
443 | return 0; | |
444 | ||
445 | if (!gfs2_is_stuffed(ip)) | |
4ff14670 | 446 | dblock = generic_block_bmap(mapping, lblock, gfs2_get_block); |
b3b94faa DT |
447 | |
448 | gfs2_glock_dq_uninit(&i_gh); | |
449 | ||
450 | return dblock; | |
451 | } | |
452 | ||
453 | static void discard_buffer(struct gfs2_sbd *sdp, struct buffer_head *bh) | |
454 | { | |
64fb4eb7 | 455 | struct gfs2_bufdata *bd; |
b3b94faa DT |
456 | |
457 | gfs2_log_lock(sdp); | |
5c676f6d | 458 | bd = bh->b_private; |
64fb4eb7 SW |
459 | if (bd) { |
460 | bd->bd_bh = NULL; | |
5c676f6d | 461 | bh->b_private = NULL; |
b3b94faa DT |
462 | gfs2_log_unlock(sdp); |
463 | brelse(bh); | |
464 | } else | |
465 | gfs2_log_unlock(sdp); | |
466 | ||
467 | lock_buffer(bh); | |
468 | clear_buffer_dirty(bh); | |
469 | bh->b_bdev = NULL; | |
470 | clear_buffer_mapped(bh); | |
471 | clear_buffer_req(bh); | |
472 | clear_buffer_new(bh); | |
473 | clear_buffer_delay(bh); | |
474 | unlock_buffer(bh); | |
475 | } | |
476 | ||
8628de05 | 477 | static void gfs2_invalidatepage(struct page *page, unsigned long offset) |
b3b94faa | 478 | { |
5c676f6d | 479 | struct gfs2_sbd *sdp = page->mapping->host->i_sb->s_fs_info; |
b3b94faa DT |
480 | struct buffer_head *head, *bh, *next; |
481 | unsigned int curr_off = 0; | |
b3b94faa DT |
482 | |
483 | BUG_ON(!PageLocked(page)); | |
484 | if (!page_has_buffers(page)) | |
8628de05 | 485 | return; |
b3b94faa DT |
486 | |
487 | bh = head = page_buffers(page); | |
488 | do { | |
489 | unsigned int next_off = curr_off + bh->b_size; | |
490 | next = bh->b_this_page; | |
491 | ||
492 | if (offset <= curr_off) | |
493 | discard_buffer(sdp, bh); | |
494 | ||
495 | curr_off = next_off; | |
496 | bh = next; | |
497 | } while (bh != head); | |
498 | ||
499 | if (!offset) | |
8628de05 | 500 | try_to_release_page(page, 0); |
b3b94faa | 501 | |
8628de05 | 502 | return; |
b3b94faa DT |
503 | } |
504 | ||
d1665e41 SW |
505 | static ssize_t gfs2_direct_IO_write(struct kiocb *iocb, const struct iovec *iov, |
506 | loff_t offset, unsigned long nr_segs) | |
507 | { | |
508 | struct file *file = iocb->ki_filp; | |
509 | struct inode *inode = file->f_mapping->host; | |
5c676f6d | 510 | struct gfs2_inode *ip = inode->u.generic_ip; |
d1665e41 SW |
511 | struct gfs2_holder gh; |
512 | int rv; | |
513 | ||
514 | /* | |
515 | * Shared lock, even though its write, since we do no allocation | |
516 | * on this path. All we need change is atime. | |
517 | */ | |
518 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); | |
519 | rv = gfs2_glock_nq_m_atime(1, &gh); | |
520 | if (rv) | |
521 | goto out; | |
522 | ||
523 | /* | |
524 | * Should we return an error here? I can't see that O_DIRECT for | |
525 | * a journaled file makes any sense. For now we'll silently fall | |
526 | * back to buffered I/O, likewise we do the same for stuffed | |
527 | * files since they are (a) small and (b) unaligned. | |
528 | */ | |
529 | if (gfs2_is_jdata(ip)) | |
530 | goto out; | |
531 | ||
532 | if (gfs2_is_stuffed(ip)) | |
533 | goto out; | |
534 | ||
535 | rv = __blockdev_direct_IO(WRITE, iocb, inode, inode->i_sb->s_bdev, | |
8628de05 | 536 | iov, offset, nr_segs, gfs2_get_block, |
d1665e41 SW |
537 | NULL, DIO_OWN_LOCKING); |
538 | out: | |
539 | gfs2_glock_dq_m(1, &gh); | |
540 | gfs2_holder_uninit(&gh); | |
541 | ||
542 | return rv; | |
543 | } | |
544 | ||
545 | /** | |
546 | * gfs2_direct_IO | |
547 | * | |
548 | * This is called with a shared lock already held for the read path. | |
549 | * Currently, no locks are held when the write path is called. | |
550 | */ | |
551 | static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, | |
552 | const struct iovec *iov, loff_t offset, | |
553 | unsigned long nr_segs) | |
b3b94faa DT |
554 | { |
555 | struct file *file = iocb->ki_filp; | |
556 | struct inode *inode = file->f_mapping->host; | |
5c676f6d | 557 | struct gfs2_inode *ip = inode->u.generic_ip; |
b3b94faa | 558 | struct gfs2_sbd *sdp = ip->i_sbd; |
b3b94faa | 559 | |
d1665e41 SW |
560 | if (rw == WRITE) |
561 | return gfs2_direct_IO_write(iocb, iov, offset, nr_segs); | |
b3b94faa | 562 | |
d1665e41 SW |
563 | if (gfs2_assert_warn(sdp, gfs2_glock_is_locked_by_me(ip->i_gl)) || |
564 | gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip))) | |
565 | return -EINVAL; | |
b3b94faa | 566 | |
d1665e41 | 567 | return __blockdev_direct_IO(READ, iocb, inode, inode->i_sb->s_bdev, iov, |
8628de05 | 568 | offset, nr_segs, gfs2_get_block, NULL, |
d1665e41 | 569 | DIO_OWN_LOCKING); |
b3b94faa DT |
570 | } |
571 | ||
572 | struct address_space_operations gfs2_file_aops = { | |
573 | .writepage = gfs2_writepage, | |
574 | .readpage = gfs2_readpage, | |
575 | .sync_page = block_sync_page, | |
576 | .prepare_write = gfs2_prepare_write, | |
577 | .commit_write = gfs2_commit_write, | |
578 | .bmap = gfs2_bmap, | |
579 | .invalidatepage = gfs2_invalidatepage, | |
580 | .direct_IO = gfs2_direct_IO, | |
581 | }; | |
582 |