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ccd979bd MF |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * file.c | |
5 | * | |
6 | * File open, close, extend, truncate | |
7 | * | |
8 | * Copyright (C) 2002, 2004 Oracle. All rights reserved. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public | |
21 | * License along with this program; if not, write to the | |
22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | * Boston, MA 021110-1307, USA. | |
24 | */ | |
25 | ||
16f7e0fe | 26 | #include <linux/capability.h> |
ccd979bd MF |
27 | #include <linux/fs.h> |
28 | #include <linux/types.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/highmem.h> | |
31 | #include <linux/pagemap.h> | |
32 | #include <linux/uio.h> | |
33 | ||
34 | #define MLOG_MASK_PREFIX ML_INODE | |
35 | #include <cluster/masklog.h> | |
36 | ||
37 | #include "ocfs2.h" | |
38 | ||
39 | #include "alloc.h" | |
40 | #include "aops.h" | |
41 | #include "dir.h" | |
42 | #include "dlmglue.h" | |
43 | #include "extent_map.h" | |
44 | #include "file.h" | |
45 | #include "sysfile.h" | |
46 | #include "inode.h" | |
ca4d147e | 47 | #include "ioctl.h" |
ccd979bd MF |
48 | #include "journal.h" |
49 | #include "mmap.h" | |
50 | #include "suballoc.h" | |
51 | #include "super.h" | |
52 | ||
53 | #include "buffer_head_io.h" | |
54 | ||
55 | static int ocfs2_sync_inode(struct inode *inode) | |
56 | { | |
57 | filemap_fdatawrite(inode->i_mapping); | |
58 | return sync_mapping_buffers(inode->i_mapping); | |
59 | } | |
60 | ||
61 | static int ocfs2_file_open(struct inode *inode, struct file *file) | |
62 | { | |
63 | int status; | |
64 | int mode = file->f_flags; | |
65 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
66 | ||
67 | mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, | |
68 | file->f_dentry->d_name.len, file->f_dentry->d_name.name); | |
69 | ||
70 | spin_lock(&oi->ip_lock); | |
71 | ||
72 | /* Check that the inode hasn't been wiped from disk by another | |
73 | * node. If it hasn't then we're safe as long as we hold the | |
74 | * spin lock until our increment of open count. */ | |
75 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) { | |
76 | spin_unlock(&oi->ip_lock); | |
77 | ||
78 | status = -ENOENT; | |
79 | goto leave; | |
80 | } | |
81 | ||
82 | if (mode & O_DIRECT) | |
83 | oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT; | |
84 | ||
85 | oi->ip_open_count++; | |
86 | spin_unlock(&oi->ip_lock); | |
87 | status = 0; | |
88 | leave: | |
89 | mlog_exit(status); | |
90 | return status; | |
91 | } | |
92 | ||
93 | static int ocfs2_file_release(struct inode *inode, struct file *file) | |
94 | { | |
95 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
96 | ||
97 | mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, | |
98 | file->f_dentry->d_name.len, | |
99 | file->f_dentry->d_name.name); | |
100 | ||
101 | spin_lock(&oi->ip_lock); | |
102 | if (!--oi->ip_open_count) | |
103 | oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT; | |
104 | spin_unlock(&oi->ip_lock); | |
105 | ||
106 | mlog_exit(0); | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static int ocfs2_sync_file(struct file *file, | |
112 | struct dentry *dentry, | |
113 | int datasync) | |
114 | { | |
115 | int err = 0; | |
116 | journal_t *journal; | |
117 | struct inode *inode = dentry->d_inode; | |
118 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
119 | ||
120 | mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync, | |
121 | dentry->d_name.len, dentry->d_name.name); | |
122 | ||
123 | err = ocfs2_sync_inode(dentry->d_inode); | |
124 | if (err) | |
125 | goto bail; | |
126 | ||
127 | journal = osb->journal->j_journal; | |
128 | err = journal_force_commit(journal); | |
129 | ||
130 | bail: | |
131 | mlog_exit(err); | |
132 | ||
133 | return (err < 0) ? -EIO : 0; | |
134 | } | |
135 | ||
136 | int ocfs2_set_inode_size(struct ocfs2_journal_handle *handle, | |
137 | struct inode *inode, | |
138 | struct buffer_head *fe_bh, | |
139 | u64 new_i_size) | |
140 | { | |
141 | int status; | |
142 | ||
143 | mlog_entry_void(); | |
144 | i_size_write(inode, new_i_size); | |
145 | inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size); | |
146 | inode->i_ctime = inode->i_mtime = CURRENT_TIME; | |
147 | ||
148 | status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); | |
149 | if (status < 0) { | |
150 | mlog_errno(status); | |
151 | goto bail; | |
152 | } | |
153 | ||
154 | bail: | |
155 | mlog_exit(status); | |
156 | return status; | |
157 | } | |
158 | ||
159 | static int ocfs2_simple_size_update(struct inode *inode, | |
160 | struct buffer_head *di_bh, | |
161 | u64 new_i_size) | |
162 | { | |
163 | int ret; | |
164 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
165 | struct ocfs2_journal_handle *handle = NULL; | |
166 | ||
167 | handle = ocfs2_start_trans(osb, NULL, | |
168 | OCFS2_INODE_UPDATE_CREDITS); | |
169 | if (handle == NULL) { | |
170 | ret = -ENOMEM; | |
171 | mlog_errno(ret); | |
172 | goto out; | |
173 | } | |
174 | ||
175 | ret = ocfs2_set_inode_size(handle, inode, di_bh, | |
176 | new_i_size); | |
177 | if (ret < 0) | |
178 | mlog_errno(ret); | |
179 | ||
180 | ocfs2_commit_trans(handle); | |
181 | out: | |
182 | return ret; | |
183 | } | |
184 | ||
185 | static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb, | |
186 | struct inode *inode, | |
187 | struct buffer_head *fe_bh, | |
188 | u64 new_i_size) | |
189 | { | |
190 | int status; | |
191 | struct ocfs2_journal_handle *handle; | |
192 | ||
193 | mlog_entry_void(); | |
194 | ||
195 | /* TODO: This needs to actually orphan the inode in this | |
196 | * transaction. */ | |
197 | ||
198 | handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS); | |
199 | if (IS_ERR(handle)) { | |
200 | status = PTR_ERR(handle); | |
201 | mlog_errno(status); | |
202 | goto out; | |
203 | } | |
204 | ||
205 | status = ocfs2_set_inode_size(handle, inode, fe_bh, new_i_size); | |
206 | if (status < 0) | |
207 | mlog_errno(status); | |
208 | ||
209 | ocfs2_commit_trans(handle); | |
210 | out: | |
211 | mlog_exit(status); | |
212 | return status; | |
213 | } | |
214 | ||
215 | static int ocfs2_truncate_file(struct inode *inode, | |
216 | struct buffer_head *di_bh, | |
217 | u64 new_i_size) | |
218 | { | |
219 | int status = 0; | |
220 | struct ocfs2_dinode *fe = NULL; | |
221 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
222 | struct ocfs2_truncate_context *tc = NULL; | |
223 | ||
b0697053 MF |
224 | mlog_entry("(inode = %llu, new_i_size = %llu\n", |
225 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
226 | (unsigned long long)new_i_size); | |
ccd979bd MF |
227 | |
228 | truncate_inode_pages(inode->i_mapping, new_i_size); | |
229 | ||
230 | fe = (struct ocfs2_dinode *) di_bh->b_data; | |
231 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
232 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); | |
233 | status = -EIO; | |
234 | goto bail; | |
235 | } | |
236 | ||
237 | mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode), | |
b0697053 MF |
238 | "Inode %llu, inode i_size = %lld != di " |
239 | "i_size = %llu, i_flags = 0x%x\n", | |
240 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd | 241 | i_size_read(inode), |
b0697053 MF |
242 | (unsigned long long)le64_to_cpu(fe->i_size), |
243 | le32_to_cpu(fe->i_flags)); | |
ccd979bd MF |
244 | |
245 | if (new_i_size > le64_to_cpu(fe->i_size)) { | |
b0697053 MF |
246 | mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n", |
247 | (unsigned long long)le64_to_cpu(fe->i_size), | |
248 | (unsigned long long)new_i_size); | |
ccd979bd MF |
249 | status = -EINVAL; |
250 | mlog_errno(status); | |
251 | goto bail; | |
252 | } | |
253 | ||
b0697053 MF |
254 | mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n", |
255 | (unsigned long long)le64_to_cpu(fe->i_blkno), | |
256 | (unsigned long long)le64_to_cpu(fe->i_size), | |
257 | (unsigned long long)new_i_size); | |
ccd979bd MF |
258 | |
259 | /* lets handle the simple truncate cases before doing any more | |
260 | * cluster locking. */ | |
261 | if (new_i_size == le64_to_cpu(fe->i_size)) | |
262 | goto bail; | |
263 | ||
ab0920ce MF |
264 | /* This forces other nodes to sync and drop their pages. Do |
265 | * this even if we have a truncate without allocation change - | |
266 | * ocfs2 cluster sizes can be much greater than page size, so | |
267 | * we have to truncate them anyway. */ | |
268 | status = ocfs2_data_lock(inode, 1); | |
269 | if (status < 0) { | |
270 | mlog_errno(status); | |
271 | goto bail; | |
272 | } | |
273 | ocfs2_data_unlock(inode, 1); | |
274 | ||
ccd979bd MF |
275 | if (le32_to_cpu(fe->i_clusters) == |
276 | ocfs2_clusters_for_bytes(osb->sb, new_i_size)) { | |
277 | mlog(0, "fe->i_clusters = %u, so we do a simple truncate\n", | |
278 | fe->i_clusters); | |
279 | /* No allocation change is required, so lets fast path | |
280 | * this truncate. */ | |
281 | status = ocfs2_simple_size_update(inode, di_bh, new_i_size); | |
282 | if (status < 0) | |
283 | mlog_errno(status); | |
284 | goto bail; | |
285 | } | |
286 | ||
ccd979bd MF |
287 | /* alright, we're going to need to do a full blown alloc size |
288 | * change. Orphan the inode so that recovery can complete the | |
289 | * truncate if necessary. This does the task of marking | |
290 | * i_size. */ | |
291 | status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size); | |
292 | if (status < 0) { | |
293 | mlog_errno(status); | |
294 | goto bail; | |
295 | } | |
296 | ||
297 | status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc); | |
298 | if (status < 0) { | |
299 | mlog_errno(status); | |
300 | goto bail; | |
301 | } | |
302 | ||
303 | status = ocfs2_commit_truncate(osb, inode, di_bh, tc); | |
304 | if (status < 0) { | |
305 | mlog_errno(status); | |
306 | goto bail; | |
307 | } | |
308 | ||
309 | /* TODO: orphan dir cleanup here. */ | |
310 | bail: | |
311 | ||
312 | mlog_exit(status); | |
313 | return status; | |
314 | } | |
315 | ||
316 | /* | |
317 | * extend allocation only here. | |
318 | * we'll update all the disk stuff, and oip->alloc_size | |
319 | * | |
320 | * expect stuff to be locked, a transaction started and enough data / | |
321 | * metadata reservations in the contexts. | |
322 | * | |
323 | * Will return -EAGAIN, and a reason if a restart is needed. | |
324 | * If passed in, *reason will always be set, even in error. | |
325 | */ | |
326 | int ocfs2_do_extend_allocation(struct ocfs2_super *osb, | |
327 | struct inode *inode, | |
328 | u32 clusters_to_add, | |
329 | struct buffer_head *fe_bh, | |
330 | struct ocfs2_journal_handle *handle, | |
331 | struct ocfs2_alloc_context *data_ac, | |
332 | struct ocfs2_alloc_context *meta_ac, | |
333 | enum ocfs2_alloc_restarted *reason_ret) | |
334 | { | |
335 | int status = 0; | |
336 | int free_extents; | |
337 | struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data; | |
338 | enum ocfs2_alloc_restarted reason = RESTART_NONE; | |
339 | u32 bit_off, num_bits; | |
340 | u64 block; | |
341 | ||
342 | BUG_ON(!clusters_to_add); | |
343 | ||
344 | free_extents = ocfs2_num_free_extents(osb, inode, fe); | |
345 | if (free_extents < 0) { | |
346 | status = free_extents; | |
347 | mlog_errno(status); | |
348 | goto leave; | |
349 | } | |
350 | ||
351 | /* there are two cases which could cause us to EAGAIN in the | |
352 | * we-need-more-metadata case: | |
353 | * 1) we haven't reserved *any* | |
354 | * 2) we are so fragmented, we've needed to add metadata too | |
355 | * many times. */ | |
356 | if (!free_extents && !meta_ac) { | |
357 | mlog(0, "we haven't reserved any metadata!\n"); | |
358 | status = -EAGAIN; | |
359 | reason = RESTART_META; | |
360 | goto leave; | |
361 | } else if ((!free_extents) | |
362 | && (ocfs2_alloc_context_bits_left(meta_ac) | |
363 | < ocfs2_extend_meta_needed(fe))) { | |
364 | mlog(0, "filesystem is really fragmented...\n"); | |
365 | status = -EAGAIN; | |
366 | reason = RESTART_META; | |
367 | goto leave; | |
368 | } | |
369 | ||
370 | status = ocfs2_claim_clusters(osb, handle, data_ac, 1, | |
371 | &bit_off, &num_bits); | |
372 | if (status < 0) { | |
373 | if (status != -ENOSPC) | |
374 | mlog_errno(status); | |
375 | goto leave; | |
376 | } | |
377 | ||
378 | BUG_ON(num_bits > clusters_to_add); | |
379 | ||
380 | /* reserve our write early -- insert_extent may update the inode */ | |
381 | status = ocfs2_journal_access(handle, inode, fe_bh, | |
382 | OCFS2_JOURNAL_ACCESS_WRITE); | |
383 | if (status < 0) { | |
384 | mlog_errno(status); | |
385 | goto leave; | |
386 | } | |
387 | ||
388 | block = ocfs2_clusters_to_blocks(osb->sb, bit_off); | |
b0697053 MF |
389 | mlog(0, "Allocating %u clusters at block %u for inode %llu\n", |
390 | num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
391 | status = ocfs2_insert_extent(osb, handle, inode, fe_bh, block, |
392 | num_bits, meta_ac); | |
393 | if (status < 0) { | |
394 | mlog_errno(status); | |
395 | goto leave; | |
396 | } | |
397 | ||
398 | le32_add_cpu(&fe->i_clusters, num_bits); | |
399 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
400 | OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters); | |
401 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
402 | ||
403 | status = ocfs2_journal_dirty(handle, fe_bh); | |
404 | if (status < 0) { | |
405 | mlog_errno(status); | |
406 | goto leave; | |
407 | } | |
408 | ||
409 | clusters_to_add -= num_bits; | |
410 | ||
411 | if (clusters_to_add) { | |
412 | mlog(0, "need to alloc once more, clusters = %u, wanted = " | |
413 | "%u\n", fe->i_clusters, clusters_to_add); | |
414 | status = -EAGAIN; | |
415 | reason = RESTART_TRANS; | |
416 | } | |
417 | ||
418 | leave: | |
419 | mlog_exit(status); | |
420 | if (reason_ret) | |
421 | *reason_ret = reason; | |
422 | return status; | |
423 | } | |
424 | ||
425 | static int ocfs2_extend_allocation(struct inode *inode, | |
426 | u32 clusters_to_add) | |
427 | { | |
428 | int status = 0; | |
429 | int restart_func = 0; | |
430 | int drop_alloc_sem = 0; | |
431 | int credits, num_free_extents; | |
432 | u32 prev_clusters; | |
433 | struct buffer_head *bh = NULL; | |
434 | struct ocfs2_dinode *fe = NULL; | |
435 | struct ocfs2_journal_handle *handle = NULL; | |
436 | struct ocfs2_alloc_context *data_ac = NULL; | |
437 | struct ocfs2_alloc_context *meta_ac = NULL; | |
438 | enum ocfs2_alloc_restarted why; | |
439 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
440 | ||
441 | mlog_entry("(clusters_to_add = %u)\n", clusters_to_add); | |
442 | ||
443 | status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh, | |
444 | OCFS2_BH_CACHED, inode); | |
445 | if (status < 0) { | |
446 | mlog_errno(status); | |
447 | goto leave; | |
448 | } | |
449 | ||
450 | fe = (struct ocfs2_dinode *) bh->b_data; | |
451 | if (!OCFS2_IS_VALID_DINODE(fe)) { | |
452 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); | |
453 | status = -EIO; | |
454 | goto leave; | |
455 | } | |
456 | ||
457 | restart_all: | |
458 | BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters); | |
459 | ||
b0697053 | 460 | mlog(0, "extend inode %llu, i_size = %lld, fe->i_clusters = %u, " |
ccd979bd | 461 | "clusters_to_add = %u\n", |
b0697053 | 462 | (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode), |
ccd979bd MF |
463 | fe->i_clusters, clusters_to_add); |
464 | ||
465 | handle = ocfs2_alloc_handle(osb); | |
466 | if (handle == NULL) { | |
467 | status = -ENOMEM; | |
468 | mlog_errno(status); | |
469 | goto leave; | |
470 | } | |
471 | ||
472 | num_free_extents = ocfs2_num_free_extents(osb, | |
473 | inode, | |
474 | fe); | |
475 | if (num_free_extents < 0) { | |
476 | status = num_free_extents; | |
477 | mlog_errno(status); | |
478 | goto leave; | |
479 | } | |
480 | ||
481 | if (!num_free_extents) { | |
482 | status = ocfs2_reserve_new_metadata(osb, | |
483 | handle, | |
484 | fe, | |
485 | &meta_ac); | |
486 | if (status < 0) { | |
487 | if (status != -ENOSPC) | |
488 | mlog_errno(status); | |
489 | goto leave; | |
490 | } | |
491 | } | |
492 | ||
493 | status = ocfs2_reserve_clusters(osb, | |
494 | handle, | |
495 | clusters_to_add, | |
496 | &data_ac); | |
497 | if (status < 0) { | |
498 | if (status != -ENOSPC) | |
499 | mlog_errno(status); | |
500 | goto leave; | |
501 | } | |
502 | ||
503 | /* blocks peope in read/write from reading our allocation | |
1b1dcc1b | 504 | * until we're done changing it. We depend on i_mutex to block |
ccd979bd MF |
505 | * other extend/truncate calls while we're here. Ordering wrt |
506 | * start_trans is important here -- always do it before! */ | |
507 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
508 | drop_alloc_sem = 1; | |
509 | ||
510 | credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add); | |
511 | handle = ocfs2_start_trans(osb, handle, credits); | |
512 | if (IS_ERR(handle)) { | |
513 | status = PTR_ERR(handle); | |
514 | handle = NULL; | |
515 | mlog_errno(status); | |
516 | goto leave; | |
517 | } | |
518 | ||
519 | restarted_transaction: | |
520 | /* reserve a write to the file entry early on - that we if we | |
521 | * run out of credits in the allocation path, we can still | |
522 | * update i_size. */ | |
523 | status = ocfs2_journal_access(handle, inode, bh, | |
524 | OCFS2_JOURNAL_ACCESS_WRITE); | |
525 | if (status < 0) { | |
526 | mlog_errno(status); | |
527 | goto leave; | |
528 | } | |
529 | ||
530 | prev_clusters = OCFS2_I(inode)->ip_clusters; | |
531 | ||
532 | status = ocfs2_do_extend_allocation(osb, | |
533 | inode, | |
534 | clusters_to_add, | |
535 | bh, | |
536 | handle, | |
537 | data_ac, | |
538 | meta_ac, | |
539 | &why); | |
540 | if ((status < 0) && (status != -EAGAIN)) { | |
541 | if (status != -ENOSPC) | |
542 | mlog_errno(status); | |
543 | goto leave; | |
544 | } | |
545 | ||
546 | status = ocfs2_journal_dirty(handle, bh); | |
547 | if (status < 0) { | |
548 | mlog_errno(status); | |
549 | goto leave; | |
550 | } | |
551 | ||
552 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
553 | clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters); | |
554 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
555 | ||
556 | if (why != RESTART_NONE && clusters_to_add) { | |
557 | if (why == RESTART_META) { | |
558 | mlog(0, "restarting function.\n"); | |
559 | restart_func = 1; | |
560 | } else { | |
561 | BUG_ON(why != RESTART_TRANS); | |
562 | ||
563 | mlog(0, "restarting transaction.\n"); | |
564 | /* TODO: This can be more intelligent. */ | |
565 | credits = ocfs2_calc_extend_credits(osb->sb, | |
566 | fe, | |
567 | clusters_to_add); | |
568 | status = ocfs2_extend_trans(handle, credits); | |
569 | if (status < 0) { | |
570 | /* handle still has to be committed at | |
571 | * this point. */ | |
572 | status = -ENOMEM; | |
573 | mlog_errno(status); | |
574 | goto leave; | |
575 | } | |
576 | goto restarted_transaction; | |
577 | } | |
578 | } | |
579 | ||
b0697053 MF |
580 | mlog(0, "fe: i_clusters = %u, i_size=%llu\n", |
581 | fe->i_clusters, (unsigned long long)fe->i_size); | |
ccd979bd MF |
582 | mlog(0, "inode: ip_clusters=%u, i_size=%lld\n", |
583 | OCFS2_I(inode)->ip_clusters, i_size_read(inode)); | |
584 | ||
585 | leave: | |
586 | if (drop_alloc_sem) { | |
587 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
588 | drop_alloc_sem = 0; | |
589 | } | |
590 | if (handle) { | |
591 | ocfs2_commit_trans(handle); | |
592 | handle = NULL; | |
593 | } | |
594 | if (data_ac) { | |
595 | ocfs2_free_alloc_context(data_ac); | |
596 | data_ac = NULL; | |
597 | } | |
598 | if (meta_ac) { | |
599 | ocfs2_free_alloc_context(meta_ac); | |
600 | meta_ac = NULL; | |
601 | } | |
602 | if ((!status) && restart_func) { | |
603 | restart_func = 0; | |
604 | goto restart_all; | |
605 | } | |
606 | if (bh) { | |
607 | brelse(bh); | |
608 | bh = NULL; | |
609 | } | |
610 | ||
611 | mlog_exit(status); | |
612 | return status; | |
613 | } | |
614 | ||
615 | /* Some parts of this taken from generic_cont_expand, which turned out | |
616 | * to be too fragile to do exactly what we need without us having to | |
53013cba MF |
617 | * worry about recursive locking in ->prepare_write() and |
618 | * ->commit_write(). */ | |
ccd979bd MF |
619 | static int ocfs2_write_zero_page(struct inode *inode, |
620 | u64 size) | |
621 | { | |
622 | struct address_space *mapping = inode->i_mapping; | |
623 | struct page *page; | |
624 | unsigned long index; | |
625 | unsigned int offset; | |
626 | struct ocfs2_journal_handle *handle = NULL; | |
627 | int ret; | |
628 | ||
629 | offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */ | |
630 | /* ugh. in prepare/commit_write, if from==to==start of block, we | |
631 | ** skip the prepare. make sure we never send an offset for the start | |
632 | ** of a block | |
633 | */ | |
634 | if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) { | |
635 | offset++; | |
636 | } | |
637 | index = size >> PAGE_CACHE_SHIFT; | |
638 | ||
639 | page = grab_cache_page(mapping, index); | |
640 | if (!page) { | |
641 | ret = -ENOMEM; | |
642 | mlog_errno(ret); | |
643 | goto out; | |
644 | } | |
645 | ||
53013cba | 646 | ret = ocfs2_prepare_write_nolock(inode, page, offset, offset); |
ccd979bd MF |
647 | if (ret < 0) { |
648 | mlog_errno(ret); | |
649 | goto out_unlock; | |
650 | } | |
651 | ||
652 | if (ocfs2_should_order_data(inode)) { | |
653 | handle = ocfs2_start_walk_page_trans(inode, page, offset, | |
654 | offset); | |
655 | if (IS_ERR(handle)) { | |
656 | ret = PTR_ERR(handle); | |
657 | handle = NULL; | |
658 | goto out_unlock; | |
659 | } | |
660 | } | |
661 | ||
662 | /* must not update i_size! */ | |
663 | ret = block_commit_write(page, offset, offset); | |
664 | if (ret < 0) | |
665 | mlog_errno(ret); | |
666 | else | |
667 | ret = 0; | |
668 | ||
669 | if (handle) | |
670 | ocfs2_commit_trans(handle); | |
671 | out_unlock: | |
672 | unlock_page(page); | |
673 | page_cache_release(page); | |
674 | out: | |
675 | return ret; | |
676 | } | |
677 | ||
678 | static int ocfs2_zero_extend(struct inode *inode, | |
679 | u64 zero_to_size) | |
680 | { | |
681 | int ret = 0; | |
682 | u64 start_off; | |
683 | struct super_block *sb = inode->i_sb; | |
684 | ||
685 | start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode)); | |
686 | while (start_off < zero_to_size) { | |
687 | ret = ocfs2_write_zero_page(inode, start_off); | |
688 | if (ret < 0) { | |
689 | mlog_errno(ret); | |
690 | goto out; | |
691 | } | |
692 | ||
693 | start_off += sb->s_blocksize; | |
694 | } | |
695 | ||
696 | out: | |
697 | return ret; | |
698 | } | |
699 | ||
53013cba MF |
700 | /* |
701 | * A tail_to_skip value > 0 indicates that we're being called from | |
702 | * ocfs2_file_aio_write(). This has the following implications: | |
703 | * | |
704 | * - we don't want to update i_size | |
705 | * - di_bh will be NULL, which is fine because it's only used in the | |
706 | * case where we want to update i_size. | |
707 | * - ocfs2_zero_extend() will then only be filling the hole created | |
708 | * between i_size and the start of the write. | |
709 | */ | |
ccd979bd MF |
710 | static int ocfs2_extend_file(struct inode *inode, |
711 | struct buffer_head *di_bh, | |
53013cba MF |
712 | u64 new_i_size, |
713 | size_t tail_to_skip) | |
ccd979bd MF |
714 | { |
715 | int ret = 0; | |
716 | u32 clusters_to_add; | |
717 | ||
53013cba MF |
718 | BUG_ON(!tail_to_skip && !di_bh); |
719 | ||
ccd979bd MF |
720 | /* setattr sometimes calls us like this. */ |
721 | if (new_i_size == 0) | |
722 | goto out; | |
723 | ||
724 | if (i_size_read(inode) == new_i_size) | |
725 | goto out; | |
726 | BUG_ON(new_i_size < i_size_read(inode)); | |
727 | ||
728 | clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) - | |
729 | OCFS2_I(inode)->ip_clusters; | |
730 | ||
731 | if (clusters_to_add) { | |
53013cba MF |
732 | /* |
733 | * protect the pages that ocfs2_zero_extend is going to | |
734 | * be pulling into the page cache.. we do this before the | |
735 | * metadata extend so that we don't get into the situation | |
736 | * where we've extended the metadata but can't get the data | |
737 | * lock to zero. | |
738 | */ | |
739 | ret = ocfs2_data_lock(inode, 1); | |
ccd979bd MF |
740 | if (ret < 0) { |
741 | mlog_errno(ret); | |
742 | goto out; | |
743 | } | |
744 | ||
53013cba | 745 | ret = ocfs2_extend_allocation(inode, clusters_to_add); |
ccd979bd MF |
746 | if (ret < 0) { |
747 | mlog_errno(ret); | |
53013cba | 748 | goto out_unlock; |
ccd979bd | 749 | } |
ccd979bd | 750 | |
53013cba MF |
751 | ret = ocfs2_zero_extend(inode, (u64)new_i_size - tail_to_skip); |
752 | if (ret < 0) { | |
753 | mlog_errno(ret); | |
754 | goto out_unlock; | |
755 | } | |
756 | } | |
757 | ||
758 | if (!tail_to_skip) { | |
759 | /* We're being called from ocfs2_setattr() which wants | |
760 | * us to update i_size */ | |
761 | ret = ocfs2_simple_size_update(inode, di_bh, new_i_size); | |
762 | if (ret < 0) | |
763 | mlog_errno(ret); | |
ccd979bd MF |
764 | } |
765 | ||
53013cba MF |
766 | out_unlock: |
767 | if (clusters_to_add) /* this is the only case in which we lock */ | |
768 | ocfs2_data_unlock(inode, 1); | |
769 | ||
ccd979bd MF |
770 | out: |
771 | return ret; | |
772 | } | |
773 | ||
774 | int ocfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
775 | { | |
776 | int status = 0, size_change; | |
777 | struct inode *inode = dentry->d_inode; | |
778 | struct super_block *sb = inode->i_sb; | |
779 | struct ocfs2_super *osb = OCFS2_SB(sb); | |
780 | struct buffer_head *bh = NULL; | |
781 | struct ocfs2_journal_handle *handle = NULL; | |
782 | ||
783 | mlog_entry("(0x%p, '%.*s')\n", dentry, | |
784 | dentry->d_name.len, dentry->d_name.name); | |
785 | ||
786 | if (attr->ia_valid & ATTR_MODE) | |
787 | mlog(0, "mode change: %d\n", attr->ia_mode); | |
788 | if (attr->ia_valid & ATTR_UID) | |
789 | mlog(0, "uid change: %d\n", attr->ia_uid); | |
790 | if (attr->ia_valid & ATTR_GID) | |
791 | mlog(0, "gid change: %d\n", attr->ia_gid); | |
792 | if (attr->ia_valid & ATTR_SIZE) | |
793 | mlog(0, "size change...\n"); | |
794 | if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME)) | |
795 | mlog(0, "time change...\n"); | |
796 | ||
797 | #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \ | |
798 | | ATTR_GID | ATTR_UID | ATTR_MODE) | |
799 | if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) { | |
800 | mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid); | |
801 | return 0; | |
802 | } | |
803 | ||
804 | status = inode_change_ok(inode, attr); | |
805 | if (status) | |
806 | return status; | |
807 | ||
808 | size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE; | |
809 | if (size_change) { | |
810 | status = ocfs2_rw_lock(inode, 1); | |
811 | if (status < 0) { | |
812 | mlog_errno(status); | |
813 | goto bail; | |
814 | } | |
815 | } | |
816 | ||
817 | status = ocfs2_meta_lock(inode, NULL, &bh, 1); | |
818 | if (status < 0) { | |
819 | if (status != -ENOENT) | |
820 | mlog_errno(status); | |
821 | goto bail_unlock_rw; | |
822 | } | |
823 | ||
824 | if (size_change && attr->ia_size != i_size_read(inode)) { | |
825 | if (i_size_read(inode) > attr->ia_size) | |
826 | status = ocfs2_truncate_file(inode, bh, attr->ia_size); | |
827 | else | |
53013cba | 828 | status = ocfs2_extend_file(inode, bh, attr->ia_size, 0); |
ccd979bd MF |
829 | if (status < 0) { |
830 | if (status != -ENOSPC) | |
831 | mlog_errno(status); | |
832 | status = -ENOSPC; | |
833 | goto bail_unlock; | |
834 | } | |
835 | } | |
836 | ||
837 | handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS); | |
838 | if (IS_ERR(handle)) { | |
839 | status = PTR_ERR(handle); | |
840 | mlog_errno(status); | |
841 | goto bail_unlock; | |
842 | } | |
843 | ||
844 | status = inode_setattr(inode, attr); | |
845 | if (status < 0) { | |
846 | mlog_errno(status); | |
847 | goto bail_commit; | |
848 | } | |
849 | ||
850 | status = ocfs2_mark_inode_dirty(handle, inode, bh); | |
851 | if (status < 0) | |
852 | mlog_errno(status); | |
853 | ||
854 | bail_commit: | |
855 | ocfs2_commit_trans(handle); | |
856 | bail_unlock: | |
857 | ocfs2_meta_unlock(inode, 1); | |
858 | bail_unlock_rw: | |
859 | if (size_change) | |
860 | ocfs2_rw_unlock(inode, 1); | |
861 | bail: | |
862 | if (bh) | |
863 | brelse(bh); | |
864 | ||
865 | mlog_exit(status); | |
866 | return status; | |
867 | } | |
868 | ||
869 | int ocfs2_getattr(struct vfsmount *mnt, | |
870 | struct dentry *dentry, | |
871 | struct kstat *stat) | |
872 | { | |
873 | struct inode *inode = dentry->d_inode; | |
874 | struct super_block *sb = dentry->d_inode->i_sb; | |
875 | struct ocfs2_super *osb = sb->s_fs_info; | |
876 | int err; | |
877 | ||
878 | mlog_entry_void(); | |
879 | ||
880 | err = ocfs2_inode_revalidate(dentry); | |
881 | if (err) { | |
882 | if (err != -ENOENT) | |
883 | mlog_errno(err); | |
884 | goto bail; | |
885 | } | |
886 | ||
887 | generic_fillattr(inode, stat); | |
888 | ||
889 | /* We set the blksize from the cluster size for performance */ | |
890 | stat->blksize = osb->s_clustersize; | |
891 | ||
892 | bail: | |
893 | mlog_exit(err); | |
894 | ||
895 | return err; | |
896 | } | |
897 | ||
898 | static int ocfs2_write_remove_suid(struct inode *inode) | |
899 | { | |
900 | int ret; | |
901 | struct buffer_head *bh = NULL; | |
902 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
903 | struct ocfs2_journal_handle *handle; | |
904 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
905 | struct ocfs2_dinode *di; | |
906 | ||
b0697053 MF |
907 | mlog_entry("(Inode %llu, mode 0%o)\n", |
908 | (unsigned long long)oi->ip_blkno, inode->i_mode); | |
ccd979bd MF |
909 | |
910 | handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS); | |
911 | if (handle == NULL) { | |
912 | ret = -ENOMEM; | |
913 | mlog_errno(ret); | |
914 | goto out; | |
915 | } | |
916 | ||
917 | ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode); | |
918 | if (ret < 0) { | |
919 | mlog_errno(ret); | |
920 | goto out_trans; | |
921 | } | |
922 | ||
923 | ret = ocfs2_journal_access(handle, inode, bh, | |
924 | OCFS2_JOURNAL_ACCESS_WRITE); | |
925 | if (ret < 0) { | |
926 | mlog_errno(ret); | |
927 | goto out_bh; | |
928 | } | |
929 | ||
930 | inode->i_mode &= ~S_ISUID; | |
931 | if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP)) | |
932 | inode->i_mode &= ~S_ISGID; | |
933 | ||
934 | di = (struct ocfs2_dinode *) bh->b_data; | |
935 | di->i_mode = cpu_to_le16(inode->i_mode); | |
936 | ||
937 | ret = ocfs2_journal_dirty(handle, bh); | |
938 | if (ret < 0) | |
939 | mlog_errno(ret); | |
940 | out_bh: | |
941 | brelse(bh); | |
942 | out_trans: | |
943 | ocfs2_commit_trans(handle); | |
944 | out: | |
945 | mlog_exit(ret); | |
946 | return ret; | |
947 | } | |
948 | ||
949 | static inline int ocfs2_write_should_remove_suid(struct inode *inode) | |
950 | { | |
951 | mode_t mode = inode->i_mode; | |
952 | ||
953 | if (!capable(CAP_FSETID)) { | |
954 | if (unlikely(mode & S_ISUID)) | |
955 | return 1; | |
956 | ||
957 | if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) | |
958 | return 1; | |
959 | } | |
960 | return 0; | |
961 | } | |
962 | ||
963 | static ssize_t ocfs2_file_aio_write(struct kiocb *iocb, | |
964 | const char __user *buf, | |
965 | size_t count, | |
966 | loff_t pos) | |
967 | { | |
968 | struct iovec local_iov = { .iov_base = (void __user *)buf, | |
969 | .iov_len = count }; | |
970 | int ret, rw_level = -1, meta_level = -1, have_alloc_sem = 0; | |
971 | u32 clusters; | |
972 | struct file *filp = iocb->ki_filp; | |
973 | struct inode *inode = filp->f_dentry->d_inode; | |
974 | loff_t newsize, saved_pos; | |
ccd979bd MF |
975 | |
976 | mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf, | |
977 | (unsigned int)count, | |
978 | filp->f_dentry->d_name.len, | |
979 | filp->f_dentry->d_name.name); | |
980 | ||
981 | /* happy write of zero bytes */ | |
982 | if (count == 0) | |
983 | return 0; | |
984 | ||
985 | if (!inode) { | |
986 | mlog(0, "bad inode\n"); | |
987 | return -EIO; | |
988 | } | |
989 | ||
1b1dcc1b JS |
990 | mutex_lock(&inode->i_mutex); |
991 | /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */ | |
ccd979bd MF |
992 | if (filp->f_flags & O_DIRECT) { |
993 | have_alloc_sem = 1; | |
994 | down_read(&inode->i_alloc_sem); | |
995 | } | |
996 | ||
997 | /* concurrent O_DIRECT writes are allowed */ | |
998 | rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1; | |
999 | ret = ocfs2_rw_lock(inode, rw_level); | |
1000 | if (ret < 0) { | |
1001 | rw_level = -1; | |
1002 | mlog_errno(ret); | |
1003 | goto out; | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * We sample i_size under a read level meta lock to see if our write | |
1008 | * is extending the file, if it is we back off and get a write level | |
1009 | * meta lock. | |
1010 | */ | |
1011 | meta_level = (filp->f_flags & O_APPEND) ? 1 : 0; | |
1012 | for(;;) { | |
1013 | ret = ocfs2_meta_lock(inode, NULL, NULL, meta_level); | |
1014 | if (ret < 0) { | |
1015 | meta_level = -1; | |
1016 | mlog_errno(ret); | |
1017 | goto out; | |
1018 | } | |
1019 | ||
1020 | /* Clear suid / sgid if necessary. We do this here | |
1021 | * instead of later in the write path because | |
1022 | * remove_suid() calls ->setattr without any hint that | |
1023 | * we may have already done our cluster locking. Since | |
1024 | * ocfs2_setattr() *must* take cluster locks to | |
1025 | * proceeed, this will lead us to recursively lock the | |
1026 | * inode. There's also the dinode i_size state which | |
1027 | * can be lost via setattr during extending writes (we | |
1028 | * set inode->i_size at the end of a write. */ | |
1029 | if (ocfs2_write_should_remove_suid(inode)) { | |
1030 | if (meta_level == 0) { | |
1031 | ocfs2_meta_unlock(inode, meta_level); | |
1032 | meta_level = 1; | |
1033 | continue; | |
1034 | } | |
1035 | ||
1036 | ret = ocfs2_write_remove_suid(inode); | |
1037 | if (ret < 0) { | |
1038 | mlog_errno(ret); | |
1039 | goto out; | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | /* work on a copy of ppos until we're sure that we won't have | |
1044 | * to recalculate it due to relocking. */ | |
1045 | if (filp->f_flags & O_APPEND) { | |
1046 | saved_pos = i_size_read(inode); | |
1047 | mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos); | |
1048 | } else { | |
1049 | saved_pos = iocb->ki_pos; | |
1050 | } | |
1051 | newsize = count + saved_pos; | |
1052 | ||
215c7f9f MF |
1053 | mlog(0, "pos=%lld newsize=%lld cursize=%lld\n", |
1054 | (long long) saved_pos, (long long) newsize, | |
1055 | (long long) i_size_read(inode)); | |
ccd979bd MF |
1056 | |
1057 | /* No need for a higher level metadata lock if we're | |
1058 | * never going past i_size. */ | |
1059 | if (newsize <= i_size_read(inode)) | |
1060 | break; | |
1061 | ||
1062 | if (meta_level == 0) { | |
1063 | ocfs2_meta_unlock(inode, meta_level); | |
1064 | meta_level = 1; | |
1065 | continue; | |
1066 | } | |
1067 | ||
1068 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
1069 | clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) - | |
1070 | OCFS2_I(inode)->ip_clusters; | |
1071 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
1072 | ||
1073 | mlog(0, "Writing at EOF, may need more allocation: " | |
215c7f9f MF |
1074 | "i_size = %lld, newsize = %lld, need %u clusters\n", |
1075 | (long long) i_size_read(inode), (long long) newsize, | |
1076 | clusters); | |
ccd979bd MF |
1077 | |
1078 | /* We only want to continue the rest of this loop if | |
1079 | * our extend will actually require more | |
1080 | * allocation. */ | |
1081 | if (!clusters) | |
1082 | break; | |
1083 | ||
53013cba | 1084 | ret = ocfs2_extend_file(inode, NULL, newsize, count); |
ccd979bd MF |
1085 | if (ret < 0) { |
1086 | if (ret != -ENOSPC) | |
1087 | mlog_errno(ret); | |
1088 | goto out; | |
1089 | } | |
ccd979bd MF |
1090 | break; |
1091 | } | |
1092 | ||
1093 | /* ok, we're done with i_size and alloc work */ | |
1094 | iocb->ki_pos = saved_pos; | |
1095 | ocfs2_meta_unlock(inode, meta_level); | |
1096 | meta_level = -1; | |
1097 | ||
1098 | /* communicate with ocfs2_dio_end_io */ | |
1099 | ocfs2_iocb_set_rw_locked(iocb); | |
1100 | ||
d267a56c | 1101 | ret = generic_file_aio_write_nolock(iocb, &local_iov, 1, &iocb->ki_pos); |
ccd979bd MF |
1102 | |
1103 | /* buffered aio wouldn't have proper lock coverage today */ | |
1104 | BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT)); | |
1105 | ||
1106 | /* | |
1107 | * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io | |
1108 | * function pointer which is called when o_direct io completes so that | |
1109 | * it can unlock our rw lock. (it's the clustered equivalent of | |
1110 | * i_alloc_sem; protects truncate from racing with pending ios). | |
1111 | * Unfortunately there are error cases which call end_io and others | |
1112 | * that don't. so we don't have to unlock the rw_lock if either an | |
1113 | * async dio is going to do it in the future or an end_io after an | |
1114 | * error has already done it. | |
1115 | */ | |
1116 | if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { | |
1117 | rw_level = -1; | |
1118 | have_alloc_sem = 0; | |
1119 | } | |
1120 | ||
1121 | out: | |
1122 | if (meta_level != -1) | |
1123 | ocfs2_meta_unlock(inode, meta_level); | |
1124 | if (have_alloc_sem) | |
1125 | up_read(&inode->i_alloc_sem); | |
1126 | if (rw_level != -1) | |
1127 | ocfs2_rw_unlock(inode, rw_level); | |
1b1dcc1b | 1128 | mutex_unlock(&inode->i_mutex); |
ccd979bd MF |
1129 | |
1130 | mlog_exit(ret); | |
1131 | return ret; | |
1132 | } | |
1133 | ||
1134 | static ssize_t ocfs2_file_aio_read(struct kiocb *iocb, | |
1135 | char __user *buf, | |
1136 | size_t count, | |
1137 | loff_t pos) | |
1138 | { | |
1139 | int ret = 0, rw_level = -1, have_alloc_sem = 0; | |
1140 | struct file *filp = iocb->ki_filp; | |
1141 | struct inode *inode = filp->f_dentry->d_inode; | |
ccd979bd MF |
1142 | |
1143 | mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf, | |
1144 | (unsigned int)count, | |
1145 | filp->f_dentry->d_name.len, | |
1146 | filp->f_dentry->d_name.name); | |
1147 | ||
1148 | if (!inode) { | |
1149 | ret = -EINVAL; | |
1150 | mlog_errno(ret); | |
1151 | goto bail; | |
1152 | } | |
1153 | ||
ccd979bd MF |
1154 | /* |
1155 | * buffered reads protect themselves in ->readpage(). O_DIRECT reads | |
1156 | * need locks to protect pending reads from racing with truncate. | |
1157 | */ | |
1158 | if (filp->f_flags & O_DIRECT) { | |
1159 | down_read(&inode->i_alloc_sem); | |
1160 | have_alloc_sem = 1; | |
1161 | ||
1162 | ret = ocfs2_rw_lock(inode, 0); | |
1163 | if (ret < 0) { | |
1164 | mlog_errno(ret); | |
1165 | goto bail; | |
1166 | } | |
1167 | rw_level = 0; | |
1168 | /* communicate with ocfs2_dio_end_io */ | |
1169 | ocfs2_iocb_set_rw_locked(iocb); | |
1170 | } | |
1171 | ||
c4374f8a MF |
1172 | /* |
1173 | * We're fine letting folks race truncates and extending | |
1174 | * writes with read across the cluster, just like they can | |
1175 | * locally. Hence no rw_lock during read. | |
1176 | * | |
1177 | * Take and drop the meta data lock to update inode fields | |
1178 | * like i_size. This allows the checks down below | |
1179 | * generic_file_aio_read() a chance of actually working. | |
1180 | */ | |
1181 | ret = ocfs2_meta_lock(inode, NULL, NULL, 0); | |
1182 | if (ret < 0) { | |
1183 | mlog_errno(ret); | |
1184 | goto bail; | |
1185 | } | |
1186 | ocfs2_meta_unlock(inode, 0); | |
1187 | ||
ccd979bd MF |
1188 | ret = generic_file_aio_read(iocb, buf, count, iocb->ki_pos); |
1189 | if (ret == -EINVAL) | |
1190 | mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n"); | |
1191 | ||
1192 | /* buffered aio wouldn't have proper lock coverage today */ | |
1193 | BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT)); | |
1194 | ||
1195 | /* see ocfs2_file_aio_write */ | |
1196 | if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { | |
1197 | rw_level = -1; | |
1198 | have_alloc_sem = 0; | |
1199 | } | |
1200 | ||
1201 | bail: | |
1202 | if (have_alloc_sem) | |
1203 | up_read(&inode->i_alloc_sem); | |
1204 | if (rw_level != -1) | |
1205 | ocfs2_rw_unlock(inode, rw_level); | |
1206 | mlog_exit(ret); | |
1207 | ||
1208 | return ret; | |
1209 | } | |
1210 | ||
1211 | struct inode_operations ocfs2_file_iops = { | |
1212 | .setattr = ocfs2_setattr, | |
1213 | .getattr = ocfs2_getattr, | |
1214 | }; | |
1215 | ||
1216 | struct inode_operations ocfs2_special_file_iops = { | |
1217 | .setattr = ocfs2_setattr, | |
1218 | .getattr = ocfs2_getattr, | |
1219 | }; | |
1220 | ||
4b6f5d20 | 1221 | const struct file_operations ocfs2_fops = { |
ccd979bd MF |
1222 | .read = do_sync_read, |
1223 | .write = do_sync_write, | |
1224 | .sendfile = generic_file_sendfile, | |
1225 | .mmap = ocfs2_mmap, | |
1226 | .fsync = ocfs2_sync_file, | |
1227 | .release = ocfs2_file_release, | |
1228 | .open = ocfs2_file_open, | |
1229 | .aio_read = ocfs2_file_aio_read, | |
1230 | .aio_write = ocfs2_file_aio_write, | |
ca4d147e | 1231 | .ioctl = ocfs2_ioctl, |
ccd979bd MF |
1232 | }; |
1233 | ||
4b6f5d20 | 1234 | const struct file_operations ocfs2_dops = { |
ccd979bd MF |
1235 | .read = generic_read_dir, |
1236 | .readdir = ocfs2_readdir, | |
1237 | .fsync = ocfs2_sync_file, | |
ca4d147e | 1238 | .ioctl = ocfs2_ioctl, |
ccd979bd | 1239 | }; |