projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
[patch 05/14] hpfs: dont call permission()
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ocfs2 / file.c
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
26 #include <linux/capability.h>
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 #include <linux/sched.h>
34 #include <linux/splice.h>
35 #include <linux/mount.h>
36 #include <linux/writeback.h>
37 #include <linux/falloc.h>
38
39 #define MLOG_MASK_PREFIX ML_INODE
40 #include <cluster/masklog.h>
41
42 #include "ocfs2.h"
43
44 #include "alloc.h"
45 #include "aops.h"
46 #include "dir.h"
47 #include "dlmglue.h"
48 #include "extent_map.h"
49 #include "file.h"
50 #include "sysfile.h"
51 #include "inode.h"
52 #include "ioctl.h"
53 #include "journal.h"
54 #include "locks.h"
55 #include "mmap.h"
56 #include "suballoc.h"
57 #include "super.h"
58
59 #include "buffer_head_io.h"
60
61 static int ocfs2_sync_inode(struct inode *inode)
62 {
63 filemap_fdatawrite(inode->i_mapping);
64 return sync_mapping_buffers(inode->i_mapping);
65 }
66
67 static int ocfs2_init_file_private(struct inode *inode, struct file *file)
68 {
69 struct ocfs2_file_private *fp;
70
71 fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
72 if (!fp)
73 return -ENOMEM;
74
75 fp->fp_file = file;
76 mutex_init(&fp->fp_mutex);
77 ocfs2_file_lock_res_init(&fp->fp_flock, fp);
78 file->private_data = fp;
79
80 return 0;
81 }
82
83 static void ocfs2_free_file_private(struct inode *inode, struct file *file)
84 {
85 struct ocfs2_file_private *fp = file->private_data;
86 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
87
88 if (fp) {
89 ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
90 ocfs2_lock_res_free(&fp->fp_flock);
91 kfree(fp);
92 file->private_data = NULL;
93 }
94 }
95
96 static int ocfs2_file_open(struct inode *inode, struct file *file)
97 {
98 int status;
99 int mode = file->f_flags;
100 struct ocfs2_inode_info *oi = OCFS2_I(inode);
101
102 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
103 file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name);
104
105 spin_lock(&oi->ip_lock);
106
107 /* Check that the inode hasn't been wiped from disk by another
108 * node. If it hasn't then we're safe as long as we hold the
109 * spin lock until our increment of open count. */
110 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
111 spin_unlock(&oi->ip_lock);
112
113 status = -ENOENT;
114 goto leave;
115 }
116
117 if (mode & O_DIRECT)
118 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
119
120 oi->ip_open_count++;
121 spin_unlock(&oi->ip_lock);
122
123 status = ocfs2_init_file_private(inode, file);
124 if (status) {
125 /*
126 * We want to set open count back if we're failing the
127 * open.
128 */
129 spin_lock(&oi->ip_lock);
130 oi->ip_open_count--;
131 spin_unlock(&oi->ip_lock);
132 }
133
134 leave:
135 mlog_exit(status);
136 return status;
137 }
138
139 static int ocfs2_file_release(struct inode *inode, struct file *file)
140 {
141 struct ocfs2_inode_info *oi = OCFS2_I(inode);
142
143 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
144 file->f_path.dentry->d_name.len,
145 file->f_path.dentry->d_name.name);
146
147 spin_lock(&oi->ip_lock);
148 if (!--oi->ip_open_count)
149 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
150 spin_unlock(&oi->ip_lock);
151
152 ocfs2_free_file_private(inode, file);
153
154 mlog_exit(0);
155
156 return 0;
157 }
158
159 static int ocfs2_dir_open(struct inode *inode, struct file *file)
160 {
161 return ocfs2_init_file_private(inode, file);
162 }
163
164 static int ocfs2_dir_release(struct inode *inode, struct file *file)
165 {
166 ocfs2_free_file_private(inode, file);
167 return 0;
168 }
169
170 static int ocfs2_sync_file(struct file *file,
171 struct dentry *dentry,
172 int datasync)
173 {
174 int err = 0;
175 journal_t *journal;
176 struct inode *inode = dentry->d_inode;
177 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
178
179 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync,
180 dentry->d_name.len, dentry->d_name.name);
181
182 err = ocfs2_sync_inode(dentry->d_inode);
183 if (err)
184 goto bail;
185
186 journal = osb->journal->j_journal;
187 err = journal_force_commit(journal);
188
189 bail:
190 mlog_exit(err);
191
192 return (err < 0) ? -EIO : 0;
193 }
194
195 int ocfs2_should_update_atime(struct inode *inode,
196 struct vfsmount *vfsmnt)
197 {
198 struct timespec now;
199 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
200
201 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
202 return 0;
203
204 if ((inode->i_flags & S_NOATIME) ||
205 ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
206 return 0;
207
208 /*
209 * We can be called with no vfsmnt structure - NFSD will
210 * sometimes do this.
211 *
212 * Note that our action here is different than touch_atime() -
213 * if we can't tell whether this is a noatime mount, then we
214 * don't know whether to trust the value of s_atime_quantum.
215 */
216 if (vfsmnt == NULL)
217 return 0;
218
219 if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
220 ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
221 return 0;
222
223 if (vfsmnt->mnt_flags & MNT_RELATIME) {
224 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
225 (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
226 return 1;
227
228 return 0;
229 }
230
231 now = CURRENT_TIME;
232 if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
233 return 0;
234 else
235 return 1;
236 }
237
238 int ocfs2_update_inode_atime(struct inode *inode,
239 struct buffer_head *bh)
240 {
241 int ret;
242 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
243 handle_t *handle;
244 struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
245
246 mlog_entry_void();
247
248 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
249 if (handle == NULL) {
250 ret = -ENOMEM;
251 mlog_errno(ret);
252 goto out;
253 }
254
255 ret = ocfs2_journal_access(handle, inode, bh,
256 OCFS2_JOURNAL_ACCESS_WRITE);
257 if (ret) {
258 mlog_errno(ret);
259 goto out_commit;
260 }
261
262 /*
263 * Don't use ocfs2_mark_inode_dirty() here as we don't always
264 * have i_mutex to guard against concurrent changes to other
265 * inode fields.
266 */
267 inode->i_atime = CURRENT_TIME;
268 di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
269 di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
270
271 ret = ocfs2_journal_dirty(handle, bh);
272 if (ret < 0)
273 mlog_errno(ret);
274
275 out_commit:
276 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
277 out:
278 mlog_exit(ret);
279 return ret;
280 }
281
282 static int ocfs2_set_inode_size(handle_t *handle,
283 struct inode *inode,
284 struct buffer_head *fe_bh,
285 u64 new_i_size)
286 {
287 int status;
288
289 mlog_entry_void();
290 i_size_write(inode, new_i_size);
291 inode->i_blocks = ocfs2_inode_sector_count(inode);
292 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
293
294 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
295 if (status < 0) {
296 mlog_errno(status);
297 goto bail;
298 }
299
300 bail:
301 mlog_exit(status);
302 return status;
303 }
304
305 static int ocfs2_simple_size_update(struct inode *inode,
306 struct buffer_head *di_bh,
307 u64 new_i_size)
308 {
309 int ret;
310 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
311 handle_t *handle = NULL;
312
313 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
314 if (handle == NULL) {
315 ret = -ENOMEM;
316 mlog_errno(ret);
317 goto out;
318 }
319
320 ret = ocfs2_set_inode_size(handle, inode, di_bh,
321 new_i_size);
322 if (ret < 0)
323 mlog_errno(ret);
324
325 ocfs2_commit_trans(osb, handle);
326 out:
327 return ret;
328 }
329
330 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
331 struct inode *inode,
332 struct buffer_head *fe_bh,
333 u64 new_i_size)
334 {
335 int status;
336 handle_t *handle;
337 struct ocfs2_dinode *di;
338 u64 cluster_bytes;
339
340 mlog_entry_void();
341
342 /* TODO: This needs to actually orphan the inode in this
343 * transaction. */
344
345 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
346 if (IS_ERR(handle)) {
347 status = PTR_ERR(handle);
348 mlog_errno(status);
349 goto out;
350 }
351
352 status = ocfs2_journal_access(handle, inode, fe_bh,
353 OCFS2_JOURNAL_ACCESS_WRITE);
354 if (status < 0) {
355 mlog_errno(status);
356 goto out_commit;
357 }
358
359 /*
360 * Do this before setting i_size.
361 */
362 cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
363 status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
364 cluster_bytes);
365 if (status) {
366 mlog_errno(status);
367 goto out_commit;
368 }
369
370 i_size_write(inode, new_i_size);
371 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
372
373 di = (struct ocfs2_dinode *) fe_bh->b_data;
374 di->i_size = cpu_to_le64(new_i_size);
375 di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
376 di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
377
378 status = ocfs2_journal_dirty(handle, fe_bh);
379 if (status < 0)
380 mlog_errno(status);
381
382 out_commit:
383 ocfs2_commit_trans(osb, handle);
384 out:
385
386 mlog_exit(status);
387 return status;
388 }
389
390 static int ocfs2_truncate_file(struct inode *inode,
391 struct buffer_head *di_bh,
392 u64 new_i_size)
393 {
394 int status = 0;
395 struct ocfs2_dinode *fe = NULL;
396 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
397 struct ocfs2_truncate_context *tc = NULL;
398
399 mlog_entry("(inode = %llu, new_i_size = %llu\n",
400 (unsigned long long)OCFS2_I(inode)->ip_blkno,
401 (unsigned long long)new_i_size);
402
403 fe = (struct ocfs2_dinode *) di_bh->b_data;
404 if (!OCFS2_IS_VALID_DINODE(fe)) {
405 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
406 status = -EIO;
407 goto bail;
408 }
409
410 mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
411 "Inode %llu, inode i_size = %lld != di "
412 "i_size = %llu, i_flags = 0x%x\n",
413 (unsigned long long)OCFS2_I(inode)->ip_blkno,
414 i_size_read(inode),
415 (unsigned long long)le64_to_cpu(fe->i_size),
416 le32_to_cpu(fe->i_flags));
417
418 if (new_i_size > le64_to_cpu(fe->i_size)) {
419 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
420 (unsigned long long)le64_to_cpu(fe->i_size),
421 (unsigned long long)new_i_size);
422 status = -EINVAL;
423 mlog_errno(status);
424 goto bail;
425 }
426
427 mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
428 (unsigned long long)le64_to_cpu(fe->i_blkno),
429 (unsigned long long)le64_to_cpu(fe->i_size),
430 (unsigned long long)new_i_size);
431
432 /* lets handle the simple truncate cases before doing any more
433 * cluster locking. */
434 if (new_i_size == le64_to_cpu(fe->i_size))
435 goto bail;
436
437 down_write(&OCFS2_I(inode)->ip_alloc_sem);
438
439 /*
440 * The inode lock forced other nodes to sync and drop their
441 * pages, which (correctly) happens even if we have a truncate
442 * without allocation change - ocfs2 cluster sizes can be much
443 * greater than page size, so we have to truncate them
444 * anyway.
445 */
446 unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
447 truncate_inode_pages(inode->i_mapping, new_i_size);
448
449 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
450 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
451 i_size_read(inode), 1);
452 if (status)
453 mlog_errno(status);
454
455 goto bail_unlock_sem;
456 }
457
458 /* alright, we're going to need to do a full blown alloc size
459 * change. Orphan the inode so that recovery can complete the
460 * truncate if necessary. This does the task of marking
461 * i_size. */
462 status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
463 if (status < 0) {
464 mlog_errno(status);
465 goto bail_unlock_sem;
466 }
467
468 status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
469 if (status < 0) {
470 mlog_errno(status);
471 goto bail_unlock_sem;
472 }
473
474 status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
475 if (status < 0) {
476 mlog_errno(status);
477 goto bail_unlock_sem;
478 }
479
480 /* TODO: orphan dir cleanup here. */
481 bail_unlock_sem:
482 up_write(&OCFS2_I(inode)->ip_alloc_sem);
483
484 bail:
485
486 mlog_exit(status);
487 return status;
488 }
489
490 /*
491 * extend allocation only here.
492 * we'll update all the disk stuff, and oip->alloc_size
493 *
494 * expect stuff to be locked, a transaction started and enough data /
495 * metadata reservations in the contexts.
496 *
497 * Will return -EAGAIN, and a reason if a restart is needed.
498 * If passed in, *reason will always be set, even in error.
499 */
500 int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
501 struct inode *inode,
502 u32 *logical_offset,
503 u32 clusters_to_add,
504 int mark_unwritten,
505 struct buffer_head *fe_bh,
506 handle_t *handle,
507 struct ocfs2_alloc_context *data_ac,
508 struct ocfs2_alloc_context *meta_ac,
509 enum ocfs2_alloc_restarted *reason_ret)
510 {
511 int status = 0;
512 int free_extents;
513 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
514 enum ocfs2_alloc_restarted reason = RESTART_NONE;
515 u32 bit_off, num_bits;
516 u64 block;
517 u8 flags = 0;
518
519 BUG_ON(!clusters_to_add);
520
521 if (mark_unwritten)
522 flags = OCFS2_EXT_UNWRITTEN;
523
524 free_extents = ocfs2_num_free_extents(osb, inode, fe);
525 if (free_extents < 0) {
526 status = free_extents;
527 mlog_errno(status);
528 goto leave;
529 }
530
531 /* there are two cases which could cause us to EAGAIN in the
532 * we-need-more-metadata case:
533 * 1) we haven't reserved *any*
534 * 2) we are so fragmented, we've needed to add metadata too
535 * many times. */
536 if (!free_extents && !meta_ac) {
537 mlog(0, "we haven't reserved any metadata!\n");
538 status = -EAGAIN;
539 reason = RESTART_META;
540 goto leave;
541 } else if ((!free_extents)
542 && (ocfs2_alloc_context_bits_left(meta_ac)
543 < ocfs2_extend_meta_needed(fe))) {
544 mlog(0, "filesystem is really fragmented...\n");
545 status = -EAGAIN;
546 reason = RESTART_META;
547 goto leave;
548 }
549
550 status = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
551 clusters_to_add, &bit_off, &num_bits);
552 if (status < 0) {
553 if (status != -ENOSPC)
554 mlog_errno(status);
555 goto leave;
556 }
557
558 BUG_ON(num_bits > clusters_to_add);
559
560 /* reserve our write early -- insert_extent may update the inode */
561 status = ocfs2_journal_access(handle, inode, fe_bh,
562 OCFS2_JOURNAL_ACCESS_WRITE);
563 if (status < 0) {
564 mlog_errno(status);
565 goto leave;
566 }
567
568 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
569 mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
570 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
571 status = ocfs2_insert_extent(osb, handle, inode, fe_bh,
572 *logical_offset, block, num_bits,
573 flags, meta_ac);
574 if (status < 0) {
575 mlog_errno(status);
576 goto leave;
577 }
578
579 status = ocfs2_journal_dirty(handle, fe_bh);
580 if (status < 0) {
581 mlog_errno(status);
582 goto leave;
583 }
584
585 clusters_to_add -= num_bits;
586 *logical_offset += num_bits;
587
588 if (clusters_to_add) {
589 mlog(0, "need to alloc once more, clusters = %u, wanted = "
590 "%u\n", fe->i_clusters, clusters_to_add);
591 status = -EAGAIN;
592 reason = RESTART_TRANS;
593 }
594
595 leave:
596 mlog_exit(status);
597 if (reason_ret)
598 *reason_ret = reason;
599 return status;
600 }
601
602 /*
603 * For a given allocation, determine which allocators will need to be
604 * accessed, and lock them, reserving the appropriate number of bits.
605 *
606 * Sparse file systems call this from ocfs2_write_begin_nolock()
607 * and ocfs2_allocate_unwritten_extents().
608 *
609 * File systems which don't support holes call this from
610 * ocfs2_extend_allocation().
611 */
612 int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di,
613 u32 clusters_to_add, u32 extents_to_split,
614 struct ocfs2_alloc_context **data_ac,
615 struct ocfs2_alloc_context **meta_ac)
616 {
617 int ret = 0, num_free_extents;
618 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
619 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
620
621 *meta_ac = NULL;
622 if (data_ac)
623 *data_ac = NULL;
624
625 BUG_ON(clusters_to_add != 0 && data_ac == NULL);
626
627 mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
628 "clusters_to_add = %u, extents_to_split = %u\n",
629 (unsigned long long)OCFS2_I(inode)->ip_blkno, (long long)i_size_read(inode),
630 le32_to_cpu(di->i_clusters), clusters_to_add, extents_to_split);
631
632 num_free_extents = ocfs2_num_free_extents(osb, inode, di);
633 if (num_free_extents < 0) {
634 ret = num_free_extents;
635 mlog_errno(ret);
636 goto out;
637 }
638
639 /*
640 * Sparse allocation file systems need to be more conservative
641 * with reserving room for expansion - the actual allocation
642 * happens while we've got a journal handle open so re-taking
643 * a cluster lock (because we ran out of room for another
644 * extent) will violate ordering rules.
645 *
646 * Most of the time we'll only be seeing this 1 cluster at a time
647 * anyway.
648 *
649 * Always lock for any unwritten extents - we might want to
650 * add blocks during a split.
651 */
652 if (!num_free_extents ||
653 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
654 ret = ocfs2_reserve_new_metadata(osb, di, meta_ac);
655 if (ret < 0) {
656 if (ret != -ENOSPC)
657 mlog_errno(ret);
658 goto out;
659 }
660 }
661
662 if (clusters_to_add == 0)
663 goto out;
664
665 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
666 if (ret < 0) {
667 if (ret != -ENOSPC)
668 mlog_errno(ret);
669 goto out;
670 }
671
672 out:
673 if (ret) {
674 if (*meta_ac) {
675 ocfs2_free_alloc_context(*meta_ac);
676 *meta_ac = NULL;
677 }
678
679 /*
680 * We cannot have an error and a non null *data_ac.
681 */
682 }
683
684 return ret;
685 }
686
687 static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
688 u32 clusters_to_add, int mark_unwritten)
689 {
690 int status = 0;
691 int restart_func = 0;
692 int credits;
693 u32 prev_clusters;
694 struct buffer_head *bh = NULL;
695 struct ocfs2_dinode *fe = NULL;
696 handle_t *handle = NULL;
697 struct ocfs2_alloc_context *data_ac = NULL;
698 struct ocfs2_alloc_context *meta_ac = NULL;
699 enum ocfs2_alloc_restarted why;
700 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
701
702 mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
703
704 /*
705 * This function only exists for file systems which don't
706 * support holes.
707 */
708 BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
709
710 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
711 OCFS2_BH_CACHED, inode);
712 if (status < 0) {
713 mlog_errno(status);
714 goto leave;
715 }
716
717 fe = (struct ocfs2_dinode *) bh->b_data;
718 if (!OCFS2_IS_VALID_DINODE(fe)) {
719 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
720 status = -EIO;
721 goto leave;
722 }
723
724 restart_all:
725 BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
726
727 status = ocfs2_lock_allocators(inode, fe, clusters_to_add, 0, &data_ac,
728 &meta_ac);
729 if (status) {
730 mlog_errno(status);
731 goto leave;
732 }
733
734 credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
735 handle = ocfs2_start_trans(osb, credits);
736 if (IS_ERR(handle)) {
737 status = PTR_ERR(handle);
738 handle = NULL;
739 mlog_errno(status);
740 goto leave;
741 }
742
743 restarted_transaction:
744 /* reserve a write to the file entry early on - that we if we
745 * run out of credits in the allocation path, we can still
746 * update i_size. */
747 status = ocfs2_journal_access(handle, inode, bh,
748 OCFS2_JOURNAL_ACCESS_WRITE);
749 if (status < 0) {
750 mlog_errno(status);
751 goto leave;
752 }
753
754 prev_clusters = OCFS2_I(inode)->ip_clusters;
755
756 status = ocfs2_do_extend_allocation(osb,
757 inode,
758 &logical_start,
759 clusters_to_add,
760 mark_unwritten,
761 bh,
762 handle,
763 data_ac,
764 meta_ac,
765 &why);
766 if ((status < 0) && (status != -EAGAIN)) {
767 if (status != -ENOSPC)
768 mlog_errno(status);
769 goto leave;
770 }
771
772 status = ocfs2_journal_dirty(handle, bh);
773 if (status < 0) {
774 mlog_errno(status);
775 goto leave;
776 }
777
778 spin_lock(&OCFS2_I(inode)->ip_lock);
779 clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
780 spin_unlock(&OCFS2_I(inode)->ip_lock);
781
782 if (why != RESTART_NONE && clusters_to_add) {
783 if (why == RESTART_META) {
784 mlog(0, "restarting function.\n");
785 restart_func = 1;
786 } else {
787 BUG_ON(why != RESTART_TRANS);
788
789 mlog(0, "restarting transaction.\n");
790 /* TODO: This can be more intelligent. */
791 credits = ocfs2_calc_extend_credits(osb->sb,
792 fe,
793 clusters_to_add);
794 status = ocfs2_extend_trans(handle, credits);
795 if (status < 0) {
796 /* handle still has to be committed at
797 * this point. */
798 status = -ENOMEM;
799 mlog_errno(status);
800 goto leave;
801 }
802 goto restarted_transaction;
803 }
804 }
805
806 mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
807 le32_to_cpu(fe->i_clusters),
808 (unsigned long long)le64_to_cpu(fe->i_size));
809 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
810 OCFS2_I(inode)->ip_clusters, (long long)i_size_read(inode));
811
812 leave:
813 if (handle) {
814 ocfs2_commit_trans(osb, handle);
815 handle = NULL;
816 }
817 if (data_ac) {
818 ocfs2_free_alloc_context(data_ac);
819 data_ac = NULL;
820 }
821 if (meta_ac) {
822 ocfs2_free_alloc_context(meta_ac);
823 meta_ac = NULL;
824 }
825 if ((!status) && restart_func) {
826 restart_func = 0;
827 goto restart_all;
828 }
829 if (bh) {
830 brelse(bh);
831 bh = NULL;
832 }
833
834 mlog_exit(status);
835 return status;
836 }
837
838 /* Some parts of this taken from generic_cont_expand, which turned out
839 * to be too fragile to do exactly what we need without us having to
840 * worry about recursive locking in ->prepare_write() and
841 * ->commit_write(). */
842 static int ocfs2_write_zero_page(struct inode *inode,
843 u64 size)
844 {
845 struct address_space *mapping = inode->i_mapping;
846 struct page *page;
847 unsigned long index;
848 unsigned int offset;
849 handle_t *handle = NULL;
850 int ret;
851
852 offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
853 /* ugh. in prepare/commit_write, if from==to==start of block, we
854 ** skip the prepare. make sure we never send an offset for the start
855 ** of a block
856 */
857 if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
858 offset++;
859 }
860 index = size >> PAGE_CACHE_SHIFT;
861
862 page = grab_cache_page(mapping, index);
863 if (!page) {
864 ret = -ENOMEM;
865 mlog_errno(ret);
866 goto out;
867 }
868
869 ret = ocfs2_prepare_write_nolock(inode, page, offset, offset);
870 if (ret < 0) {
871 mlog_errno(ret);
872 goto out_unlock;
873 }
874
875 if (ocfs2_should_order_data(inode)) {
876 handle = ocfs2_start_walk_page_trans(inode, page, offset,
877 offset);
878 if (IS_ERR(handle)) {
879 ret = PTR_ERR(handle);
880 handle = NULL;
881 goto out_unlock;
882 }
883 }
884
885 /* must not update i_size! */
886 ret = block_commit_write(page, offset, offset);
887 if (ret < 0)
888 mlog_errno(ret);
889 else
890 ret = 0;
891
892 if (handle)
893 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
894 out_unlock:
895 unlock_page(page);
896 page_cache_release(page);
897 out:
898 return ret;
899 }
900
901 static int ocfs2_zero_extend(struct inode *inode,
902 u64 zero_to_size)
903 {
904 int ret = 0;
905 u64 start_off;
906 struct super_block *sb = inode->i_sb;
907
908 start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
909 while (start_off < zero_to_size) {
910 ret = ocfs2_write_zero_page(inode, start_off);
911 if (ret < 0) {
912 mlog_errno(ret);
913 goto out;
914 }
915
916 start_off += sb->s_blocksize;
917
918 /*
919 * Very large extends have the potential to lock up
920 * the cpu for extended periods of time.
921 */
922 cond_resched();
923 }
924
925 out:
926 return ret;
927 }
928
929 int ocfs2_extend_no_holes(struct inode *inode, u64 new_i_size, u64 zero_to)
930 {
931 int ret;
932 u32 clusters_to_add;
933 struct ocfs2_inode_info *oi = OCFS2_I(inode);
934
935 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
936 if (clusters_to_add < oi->ip_clusters)
937 clusters_to_add = 0;
938 else
939 clusters_to_add -= oi->ip_clusters;
940
941 if (clusters_to_add) {
942 ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
943 clusters_to_add, 0);
944 if (ret) {
945 mlog_errno(ret);
946 goto out;
947 }
948 }
949
950 /*
951 * Call this even if we don't add any clusters to the tree. We
952 * still need to zero the area between the old i_size and the
953 * new i_size.
954 */
955 ret = ocfs2_zero_extend(inode, zero_to);
956 if (ret < 0)
957 mlog_errno(ret);
958
959 out:
960 return ret;
961 }
962
963 static int ocfs2_extend_file(struct inode *inode,
964 struct buffer_head *di_bh,
965 u64 new_i_size)
966 {
967 int ret = 0;
968 struct ocfs2_inode_info *oi = OCFS2_I(inode);
969
970 BUG_ON(!di_bh);
971
972 /* setattr sometimes calls us like this. */
973 if (new_i_size == 0)
974 goto out;
975
976 if (i_size_read(inode) == new_i_size)
977 goto out;
978 BUG_ON(new_i_size < i_size_read(inode));
979
980 /*
981 * Fall through for converting inline data, even if the fs
982 * supports sparse files.
983 *
984 * The check for inline data here is legal - nobody can add
985 * the feature since we have i_mutex. We must check it again
986 * after acquiring ip_alloc_sem though, as paths like mmap
987 * might have raced us to converting the inode to extents.
988 */
989 if (!(oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
990 && ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
991 goto out_update_size;
992
993 /*
994 * The alloc sem blocks people in read/write from reading our
995 * allocation until we're done changing it. We depend on
996 * i_mutex to block other extend/truncate calls while we're
997 * here.
998 */
999 down_write(&oi->ip_alloc_sem);
1000
1001 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1002 /*
1003 * We can optimize small extends by keeping the inodes
1004 * inline data.
1005 */
1006 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1007 up_write(&oi->ip_alloc_sem);
1008 goto out_update_size;
1009 }
1010
1011 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1012 if (ret) {
1013 up_write(&oi->ip_alloc_sem);
1014
1015 mlog_errno(ret);
1016 goto out;
1017 }
1018 }
1019
1020 if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1021 ret = ocfs2_extend_no_holes(inode, new_i_size, new_i_size);
1022
1023 up_write(&oi->ip_alloc_sem);
1024
1025 if (ret < 0) {
1026 mlog_errno(ret);
1027 goto out;
1028 }
1029
1030 out_update_size:
1031 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1032 if (ret < 0)
1033 mlog_errno(ret);
1034
1035 out:
1036 return ret;
1037 }
1038
1039 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1040 {
1041 int status = 0, size_change;
1042 struct inode *inode = dentry->d_inode;
1043 struct super_block *sb = inode->i_sb;
1044 struct ocfs2_super *osb = OCFS2_SB(sb);
1045 struct buffer_head *bh = NULL;
1046 handle_t *handle = NULL;
1047
1048 mlog_entry("(0x%p, '%.*s')\n", dentry,
1049 dentry->d_name.len, dentry->d_name.name);
1050
1051 /* ensuring we don't even attempt to truncate a symlink */
1052 if (S_ISLNK(inode->i_mode))
1053 attr->ia_valid &= ~ATTR_SIZE;
1054
1055 if (attr->ia_valid & ATTR_MODE)
1056 mlog(0, "mode change: %d\n", attr->ia_mode);
1057 if (attr->ia_valid & ATTR_UID)
1058 mlog(0, "uid change: %d\n", attr->ia_uid);
1059 if (attr->ia_valid & ATTR_GID)
1060 mlog(0, "gid change: %d\n", attr->ia_gid);
1061 if (attr->ia_valid & ATTR_SIZE)
1062 mlog(0, "size change...\n");
1063 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
1064 mlog(0, "time change...\n");
1065
1066 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1067 | ATTR_GID | ATTR_UID | ATTR_MODE)
1068 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
1069 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
1070 return 0;
1071 }
1072
1073 status = inode_change_ok(inode, attr);
1074 if (status)
1075 return status;
1076
1077 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1078 if (size_change) {
1079 status = ocfs2_rw_lock(inode, 1);
1080 if (status < 0) {
1081 mlog_errno(status);
1082 goto bail;
1083 }
1084 }
1085
1086 status = ocfs2_inode_lock(inode, &bh, 1);
1087 if (status < 0) {
1088 if (status != -ENOENT)
1089 mlog_errno(status);
1090 goto bail_unlock_rw;
1091 }
1092
1093 if (size_change && attr->ia_size != i_size_read(inode)) {
1094 if (attr->ia_size > sb->s_maxbytes) {
1095 status = -EFBIG;
1096 goto bail_unlock;
1097 }
1098
1099 if (i_size_read(inode) > attr->ia_size)
1100 status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1101 else
1102 status = ocfs2_extend_file(inode, bh, attr->ia_size);
1103 if (status < 0) {
1104 if (status != -ENOSPC)
1105 mlog_errno(status);
1106 status = -ENOSPC;
1107 goto bail_unlock;
1108 }
1109 }
1110
1111 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1112 if (IS_ERR(handle)) {
1113 status = PTR_ERR(handle);
1114 mlog_errno(status);
1115 goto bail_unlock;
1116 }
1117
1118 /*
1119 * This will intentionally not wind up calling vmtruncate(),
1120 * since all the work for a size change has been done above.
1121 * Otherwise, we could get into problems with truncate as
1122 * ip_alloc_sem is used there to protect against i_size
1123 * changes.
1124 */
1125 status = inode_setattr(inode, attr);
1126 if (status < 0) {
1127 mlog_errno(status);
1128 goto bail_commit;
1129 }
1130
1131 status = ocfs2_mark_inode_dirty(handle, inode, bh);
1132 if (status < 0)
1133 mlog_errno(status);
1134
1135 bail_commit:
1136 ocfs2_commit_trans(osb, handle);
1137 bail_unlock:
1138 ocfs2_inode_unlock(inode, 1);
1139 bail_unlock_rw:
1140 if (size_change)
1141 ocfs2_rw_unlock(inode, 1);
1142 bail:
1143 if (bh)
1144 brelse(bh);
1145
1146 mlog_exit(status);
1147 return status;
1148 }
1149
1150 int ocfs2_getattr(struct vfsmount *mnt,
1151 struct dentry *dentry,
1152 struct kstat *stat)
1153 {
1154 struct inode *inode = dentry->d_inode;
1155 struct super_block *sb = dentry->d_inode->i_sb;
1156 struct ocfs2_super *osb = sb->s_fs_info;
1157 int err;
1158
1159 mlog_entry_void();
1160
1161 err = ocfs2_inode_revalidate(dentry);
1162 if (err) {
1163 if (err != -ENOENT)
1164 mlog_errno(err);
1165 goto bail;
1166 }
1167
1168 generic_fillattr(inode, stat);
1169
1170 /* We set the blksize from the cluster size for performance */
1171 stat->blksize = osb->s_clustersize;
1172
1173 bail:
1174 mlog_exit(err);
1175
1176 return err;
1177 }
1178
1179 int ocfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
1180 {
1181 int ret;
1182
1183 mlog_entry_void();
1184
1185 ret = ocfs2_inode_lock(inode, NULL, 0);
1186 if (ret) {
1187 if (ret != -ENOENT)
1188 mlog_errno(ret);
1189 goto out;
1190 }
1191
1192 ret = generic_permission(inode, mask, NULL);
1193
1194 ocfs2_inode_unlock(inode, 0);
1195 out:
1196 mlog_exit(ret);
1197 return ret;
1198 }
1199
1200 static int __ocfs2_write_remove_suid(struct inode *inode,
1201 struct buffer_head *bh)
1202 {
1203 int ret;
1204 handle_t *handle;
1205 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1206 struct ocfs2_dinode *di;
1207
1208 mlog_entry("(Inode %llu, mode 0%o)\n",
1209 (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
1210
1211 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1212 if (handle == NULL) {
1213 ret = -ENOMEM;
1214 mlog_errno(ret);
1215 goto out;
1216 }
1217
1218 ret = ocfs2_journal_access(handle, inode, bh,
1219 OCFS2_JOURNAL_ACCESS_WRITE);
1220 if (ret < 0) {
1221 mlog_errno(ret);
1222 goto out_trans;
1223 }
1224
1225 inode->i_mode &= ~S_ISUID;
1226 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1227 inode->i_mode &= ~S_ISGID;
1228
1229 di = (struct ocfs2_dinode *) bh->b_data;
1230 di->i_mode = cpu_to_le16(inode->i_mode);
1231
1232 ret = ocfs2_journal_dirty(handle, bh);
1233 if (ret < 0)
1234 mlog_errno(ret);
1235
1236 out_trans:
1237 ocfs2_commit_trans(osb, handle);
1238 out:
1239 mlog_exit(ret);
1240 return ret;
1241 }
1242
1243 /*
1244 * Will look for holes and unwritten extents in the range starting at
1245 * pos for count bytes (inclusive).
1246 */
1247 static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1248 size_t count)
1249 {
1250 int ret = 0;
1251 unsigned int extent_flags;
1252 u32 cpos, clusters, extent_len, phys_cpos;
1253 struct super_block *sb = inode->i_sb;
1254
1255 cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1256 clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1257
1258 while (clusters) {
1259 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1260 &extent_flags);
1261 if (ret < 0) {
1262 mlog_errno(ret);
1263 goto out;
1264 }
1265
1266 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1267 ret = 1;
1268 break;
1269 }
1270
1271 if (extent_len > clusters)
1272 extent_len = clusters;
1273
1274 clusters -= extent_len;
1275 cpos += extent_len;
1276 }
1277 out:
1278 return ret;
1279 }
1280
1281 static int ocfs2_write_remove_suid(struct inode *inode)
1282 {
1283 int ret;
1284 struct buffer_head *bh = NULL;
1285 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1286
1287 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1288 oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
1289 if (ret < 0) {
1290 mlog_errno(ret);
1291 goto out;
1292 }
1293
1294 ret = __ocfs2_write_remove_suid(inode, bh);
1295 out:
1296 brelse(bh);
1297 return ret;
1298 }
1299
1300 /*
1301 * Allocate enough extents to cover the region starting at byte offset
1302 * start for len bytes. Existing extents are skipped, any extents
1303 * added are marked as "unwritten".
1304 */
1305 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1306 u64 start, u64 len)
1307 {
1308 int ret;
1309 u32 cpos, phys_cpos, clusters, alloc_size;
1310 u64 end = start + len;
1311 struct buffer_head *di_bh = NULL;
1312
1313 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1314 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1315 OCFS2_I(inode)->ip_blkno, &di_bh,
1316 OCFS2_BH_CACHED, inode);
1317 if (ret) {
1318 mlog_errno(ret);
1319 goto out;
1320 }
1321
1322 /*
1323 * Nothing to do if the requested reservation range
1324 * fits within the inode.
1325 */
1326 if (ocfs2_size_fits_inline_data(di_bh, end))
1327 goto out;
1328
1329 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1330 if (ret) {
1331 mlog_errno(ret);
1332 goto out;
1333 }
1334 }
1335
1336 /*
1337 * We consider both start and len to be inclusive.
1338 */
1339 cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1340 clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1341 clusters -= cpos;
1342
1343 while (clusters) {
1344 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1345 &alloc_size, NULL);
1346 if (ret) {
1347 mlog_errno(ret);
1348 goto out;
1349 }
1350
1351 /*
1352 * Hole or existing extent len can be arbitrary, so
1353 * cap it to our own allocation request.
1354 */
1355 if (alloc_size > clusters)
1356 alloc_size = clusters;
1357
1358 if (phys_cpos) {
1359 /*
1360 * We already have an allocation at this
1361 * region so we can safely skip it.
1362 */
1363 goto next;
1364 }
1365
1366 ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1367 if (ret) {
1368 if (ret != -ENOSPC)
1369 mlog_errno(ret);
1370 goto out;
1371 }
1372
1373 next:
1374 cpos += alloc_size;
1375 clusters -= alloc_size;
1376 }
1377
1378 ret = 0;
1379 out:
1380
1381 brelse(di_bh);
1382 return ret;
1383 }
1384
1385 static int __ocfs2_remove_inode_range(struct inode *inode,
1386 struct buffer_head *di_bh,
1387 u32 cpos, u32 phys_cpos, u32 len,
1388 struct ocfs2_cached_dealloc_ctxt *dealloc)
1389 {
1390 int ret;
1391 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
1392 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1393 struct inode *tl_inode = osb->osb_tl_inode;
1394 handle_t *handle;
1395 struct ocfs2_alloc_context *meta_ac = NULL;
1396 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1397
1398 ret = ocfs2_lock_allocators(inode, di, 0, 1, NULL, &meta_ac);
1399 if (ret) {
1400 mlog_errno(ret);
1401 return ret;
1402 }
1403
1404 mutex_lock(&tl_inode->i_mutex);
1405
1406 if (ocfs2_truncate_log_needs_flush(osb)) {
1407 ret = __ocfs2_flush_truncate_log(osb);
1408 if (ret < 0) {
1409 mlog_errno(ret);
1410 goto out;
1411 }
1412 }
1413
1414 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
1415 if (handle == NULL) {
1416 ret = -ENOMEM;
1417 mlog_errno(ret);
1418 goto out;
1419 }
1420
1421 ret = ocfs2_journal_access(handle, inode, di_bh,
1422 OCFS2_JOURNAL_ACCESS_WRITE);
1423 if (ret) {
1424 mlog_errno(ret);
1425 goto out;
1426 }
1427
1428 ret = ocfs2_remove_extent(inode, di_bh, cpos, len, handle, meta_ac,
1429 dealloc);
1430 if (ret) {
1431 mlog_errno(ret);
1432 goto out_commit;
1433 }
1434
1435 OCFS2_I(inode)->ip_clusters -= len;
1436 di->i_clusters = cpu_to_le32(OCFS2_I(inode)->ip_clusters);
1437
1438 ret = ocfs2_journal_dirty(handle, di_bh);
1439 if (ret) {
1440 mlog_errno(ret);
1441 goto out_commit;
1442 }
1443
1444 ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
1445 if (ret)
1446 mlog_errno(ret);
1447
1448 out_commit:
1449 ocfs2_commit_trans(osb, handle);
1450 out:
1451 mutex_unlock(&tl_inode->i_mutex);
1452
1453 if (meta_ac)
1454 ocfs2_free_alloc_context(meta_ac);
1455
1456 return ret;
1457 }
1458
1459 /*
1460 * Truncate a byte range, avoiding pages within partial clusters. This
1461 * preserves those pages for the zeroing code to write to.
1462 */
1463 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1464 u64 byte_len)
1465 {
1466 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1467 loff_t start, end;
1468 struct address_space *mapping = inode->i_mapping;
1469
1470 start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1471 end = byte_start + byte_len;
1472 end = end & ~(osb->s_clustersize - 1);
1473
1474 if (start < end) {
1475 unmap_mapping_range(mapping, start, end - start, 0);
1476 truncate_inode_pages_range(mapping, start, end - 1);
1477 }
1478 }
1479
1480 static int ocfs2_zero_partial_clusters(struct inode *inode,
1481 u64 start, u64 len)
1482 {
1483 int ret = 0;
1484 u64 tmpend, end = start + len;
1485 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1486 unsigned int csize = osb->s_clustersize;
1487 handle_t *handle;
1488
1489 /*
1490 * The "start" and "end" values are NOT necessarily part of
1491 * the range whose allocation is being deleted. Rather, this
1492 * is what the user passed in with the request. We must zero
1493 * partial clusters here. There's no need to worry about
1494 * physical allocation - the zeroing code knows to skip holes.
1495 */
1496 mlog(0, "byte start: %llu, end: %llu\n",
1497 (unsigned long long)start, (unsigned long long)end);
1498
1499 /*
1500 * If both edges are on a cluster boundary then there's no
1501 * zeroing required as the region is part of the allocation to
1502 * be truncated.
1503 */
1504 if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1505 goto out;
1506
1507 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1508 if (handle == NULL) {
1509 ret = -ENOMEM;
1510 mlog_errno(ret);
1511 goto out;
1512 }
1513
1514 /*
1515 * We want to get the byte offset of the end of the 1st cluster.
1516 */
1517 tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1518 if (tmpend > end)
1519 tmpend = end;
1520
1521 mlog(0, "1st range: start: %llu, tmpend: %llu\n",
1522 (unsigned long long)start, (unsigned long long)tmpend);
1523
1524 ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1525 if (ret)
1526 mlog_errno(ret);
1527
1528 if (tmpend < end) {
1529 /*
1530 * This may make start and end equal, but the zeroing
1531 * code will skip any work in that case so there's no
1532 * need to catch it up here.
1533 */
1534 start = end & ~(osb->s_clustersize - 1);
1535
1536 mlog(0, "2nd range: start: %llu, end: %llu\n",
1537 (unsigned long long)start, (unsigned long long)end);
1538
1539 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1540 if (ret)
1541 mlog_errno(ret);
1542 }
1543
1544 ocfs2_commit_trans(osb, handle);
1545 out:
1546 return ret;
1547 }
1548
1549 static int ocfs2_remove_inode_range(struct inode *inode,
1550 struct buffer_head *di_bh, u64 byte_start,
1551 u64 byte_len)
1552 {
1553 int ret = 0;
1554 u32 trunc_start, trunc_len, cpos, phys_cpos, alloc_size;
1555 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1556 struct ocfs2_cached_dealloc_ctxt dealloc;
1557 struct address_space *mapping = inode->i_mapping;
1558
1559 ocfs2_init_dealloc_ctxt(&dealloc);
1560
1561 if (byte_len == 0)
1562 return 0;
1563
1564 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1565 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1566 byte_start + byte_len, 0);
1567 if (ret) {
1568 mlog_errno(ret);
1569 goto out;
1570 }
1571 /*
1572 * There's no need to get fancy with the page cache
1573 * truncate of an inline-data inode. We're talking
1574 * about less than a page here, which will be cached
1575 * in the dinode buffer anyway.
1576 */
1577 unmap_mapping_range(mapping, 0, 0, 0);
1578 truncate_inode_pages(mapping, 0);
1579 goto out;
1580 }
1581
1582 trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1583 trunc_len = (byte_start + byte_len) >> osb->s_clustersize_bits;
1584 if (trunc_len >= trunc_start)
1585 trunc_len -= trunc_start;
1586 else
1587 trunc_len = 0;
1588
1589 mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u\n",
1590 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1591 (unsigned long long)byte_start,
1592 (unsigned long long)byte_len, trunc_start, trunc_len);
1593
1594 ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1595 if (ret) {
1596 mlog_errno(ret);
1597 goto out;
1598 }
1599
1600 cpos = trunc_start;
1601 while (trunc_len) {
1602 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1603 &alloc_size, NULL);
1604 if (ret) {
1605 mlog_errno(ret);
1606 goto out;
1607 }
1608
1609 if (alloc_size > trunc_len)
1610 alloc_size = trunc_len;
1611
1612 /* Only do work for non-holes */
1613 if (phys_cpos != 0) {
1614 ret = __ocfs2_remove_inode_range(inode, di_bh, cpos,
1615 phys_cpos, alloc_size,
1616 &dealloc);
1617 if (ret) {
1618 mlog_errno(ret);
1619 goto out;
1620 }
1621 }
1622
1623 cpos += alloc_size;
1624 trunc_len -= alloc_size;
1625 }
1626
1627 ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1628
1629 out:
1630 ocfs2_schedule_truncate_log_flush(osb, 1);
1631 ocfs2_run_deallocs(osb, &dealloc);
1632
1633 return ret;
1634 }
1635
1636 /*
1637 * Parts of this function taken from xfs_change_file_space()
1638 */
1639 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1640 loff_t f_pos, unsigned int cmd,
1641 struct ocfs2_space_resv *sr,
1642 int change_size)
1643 {
1644 int ret;
1645 s64 llen;
1646 loff_t size;
1647 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1648 struct buffer_head *di_bh = NULL;
1649 handle_t *handle;
1650 unsigned long long max_off = inode->i_sb->s_maxbytes;
1651
1652 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1653 return -EROFS;
1654
1655 mutex_lock(&inode->i_mutex);
1656
1657 /*
1658 * This prevents concurrent writes on other nodes
1659 */
1660 ret = ocfs2_rw_lock(inode, 1);
1661 if (ret) {
1662 mlog_errno(ret);
1663 goto out;
1664 }
1665
1666 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1667 if (ret) {
1668 mlog_errno(ret);
1669 goto out_rw_unlock;
1670 }
1671
1672 if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1673 ret = -EPERM;
1674 goto out_inode_unlock;
1675 }
1676
1677 switch (sr->l_whence) {
1678 case 0: /*SEEK_SET*/
1679 break;
1680 case 1: /*SEEK_CUR*/
1681 sr->l_start += f_pos;
1682 break;
1683 case 2: /*SEEK_END*/
1684 sr->l_start += i_size_read(inode);
1685 break;
1686 default:
1687 ret = -EINVAL;
1688 goto out_inode_unlock;
1689 }
1690 sr->l_whence = 0;
1691
1692 llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1693
1694 if (sr->l_start < 0
1695 || sr->l_start > max_off
1696 || (sr->l_start + llen) < 0
1697 || (sr->l_start + llen) > max_off) {
1698 ret = -EINVAL;
1699 goto out_inode_unlock;
1700 }
1701 size = sr->l_start + sr->l_len;
1702
1703 if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
1704 if (sr->l_len <= 0) {
1705 ret = -EINVAL;
1706 goto out_inode_unlock;
1707 }
1708 }
1709
1710 if (file && should_remove_suid(file->f_path.dentry)) {
1711 ret = __ocfs2_write_remove_suid(inode, di_bh);
1712 if (ret) {
1713 mlog_errno(ret);
1714 goto out_inode_unlock;
1715 }
1716 }
1717
1718 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1719 switch (cmd) {
1720 case OCFS2_IOC_RESVSP:
1721 case OCFS2_IOC_RESVSP64:
1722 /*
1723 * This takes unsigned offsets, but the signed ones we
1724 * pass have been checked against overflow above.
1725 */
1726 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1727 sr->l_len);
1728 break;
1729 case OCFS2_IOC_UNRESVSP:
1730 case OCFS2_IOC_UNRESVSP64:
1731 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1732 sr->l_len);
1733 break;
1734 default:
1735 ret = -EINVAL;
1736 }
1737 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1738 if (ret) {
1739 mlog_errno(ret);
1740 goto out_inode_unlock;
1741 }
1742
1743 /*
1744 * We update c/mtime for these changes
1745 */
1746 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1747 if (IS_ERR(handle)) {
1748 ret = PTR_ERR(handle);
1749 mlog_errno(ret);
1750 goto out_inode_unlock;
1751 }
1752
1753 if (change_size && i_size_read(inode) < size)
1754 i_size_write(inode, size);
1755
1756 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1757 ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1758 if (ret < 0)
1759 mlog_errno(ret);
1760
1761 ocfs2_commit_trans(osb, handle);
1762
1763 out_inode_unlock:
1764 brelse(di_bh);
1765 ocfs2_inode_unlock(inode, 1);
1766 out_rw_unlock:
1767 ocfs2_rw_unlock(inode, 1);
1768
1769 mutex_unlock(&inode->i_mutex);
1770 out:
1771 return ret;
1772 }
1773
1774 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1775 struct ocfs2_space_resv *sr)
1776 {
1777 struct inode *inode = file->f_path.dentry->d_inode;
1778 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);;
1779
1780 if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1781 !ocfs2_writes_unwritten_extents(osb))
1782 return -ENOTTY;
1783 else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1784 !ocfs2_sparse_alloc(osb))
1785 return -ENOTTY;
1786
1787 if (!S_ISREG(inode->i_mode))
1788 return -EINVAL;
1789
1790 if (!(file->f_mode & FMODE_WRITE))
1791 return -EBADF;
1792
1793 return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1794 }
1795
1796 static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset,
1797 loff_t len)
1798 {
1799 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1800 struct ocfs2_space_resv sr;
1801 int change_size = 1;
1802
1803 if (!ocfs2_writes_unwritten_extents(osb))
1804 return -EOPNOTSUPP;
1805
1806 if (S_ISDIR(inode->i_mode))
1807 return -ENODEV;
1808
1809 if (mode & FALLOC_FL_KEEP_SIZE)
1810 change_size = 0;
1811
1812 sr.l_whence = 0;
1813 sr.l_start = (s64)offset;
1814 sr.l_len = (s64)len;
1815
1816 return __ocfs2_change_file_space(NULL, inode, offset,
1817 OCFS2_IOC_RESVSP64, &sr, change_size);
1818 }
1819
1820 static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
1821 loff_t *ppos,
1822 size_t count,
1823 int appending,
1824 int *direct_io)
1825 {
1826 int ret = 0, meta_level = 0;
1827 struct inode *inode = dentry->d_inode;
1828 loff_t saved_pos, end;
1829
1830 /*
1831 * We start with a read level meta lock and only jump to an ex
1832 * if we need to make modifications here.
1833 */
1834 for(;;) {
1835 ret = ocfs2_inode_lock(inode, NULL, meta_level);
1836 if (ret < 0) {
1837 meta_level = -1;
1838 mlog_errno(ret);
1839 goto out;
1840 }
1841
1842 /* Clear suid / sgid if necessary. We do this here
1843 * instead of later in the write path because
1844 * remove_suid() calls ->setattr without any hint that
1845 * we may have already done our cluster locking. Since
1846 * ocfs2_setattr() *must* take cluster locks to
1847 * proceeed, this will lead us to recursively lock the
1848 * inode. There's also the dinode i_size state which
1849 * can be lost via setattr during extending writes (we
1850 * set inode->i_size at the end of a write. */
1851 if (should_remove_suid(dentry)) {
1852 if (meta_level == 0) {
1853 ocfs2_inode_unlock(inode, meta_level);
1854 meta_level = 1;
1855 continue;
1856 }
1857
1858 ret = ocfs2_write_remove_suid(inode);
1859 if (ret < 0) {
1860 mlog_errno(ret);
1861 goto out_unlock;
1862 }
1863 }
1864
1865 /* work on a copy of ppos until we're sure that we won't have
1866 * to recalculate it due to relocking. */
1867 if (appending) {
1868 saved_pos = i_size_read(inode);
1869 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
1870 } else {
1871 saved_pos = *ppos;
1872 }
1873
1874 end = saved_pos + count;
1875
1876 /*
1877 * Skip the O_DIRECT checks if we don't need
1878 * them.
1879 */
1880 if (!direct_io || !(*direct_io))
1881 break;
1882
1883 /*
1884 * There's no sane way to do direct writes to an inode
1885 * with inline data.
1886 */
1887 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1888 *direct_io = 0;
1889 break;
1890 }
1891
1892 /*
1893 * Allowing concurrent direct writes means
1894 * i_size changes wouldn't be synchronized, so
1895 * one node could wind up truncating another
1896 * nodes writes.
1897 */
1898 if (end > i_size_read(inode)) {
1899 *direct_io = 0;
1900 break;
1901 }
1902
1903 /*
1904 * We don't fill holes during direct io, so
1905 * check for them here. If any are found, the
1906 * caller will have to retake some cluster
1907 * locks and initiate the io as buffered.
1908 */
1909 ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
1910 if (ret == 1) {
1911 *direct_io = 0;
1912 ret = 0;
1913 } else if (ret < 0)
1914 mlog_errno(ret);
1915 break;
1916 }
1917
1918 if (appending)
1919 *ppos = saved_pos;
1920
1921 out_unlock:
1922 ocfs2_inode_unlock(inode, meta_level);
1923
1924 out:
1925 return ret;
1926 }
1927
1928 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
1929 const struct iovec *iov,
1930 unsigned long nr_segs,
1931 loff_t pos)
1932 {
1933 int ret, direct_io, appending, rw_level, have_alloc_sem = 0;
1934 int can_do_direct;
1935 ssize_t written = 0;
1936 size_t ocount; /* original count */
1937 size_t count; /* after file limit checks */
1938 loff_t old_size, *ppos = &iocb->ki_pos;
1939 u32 old_clusters;
1940 struct file *file = iocb->ki_filp;
1941 struct inode *inode = file->f_path.dentry->d_inode;
1942 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1943
1944 mlog_entry("(0x%p, %u, '%.*s')\n", file,
1945 (unsigned int)nr_segs,
1946 file->f_path.dentry->d_name.len,
1947 file->f_path.dentry->d_name.name);
1948
1949 if (iocb->ki_left == 0)
1950 return 0;
1951
1952 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
1953
1954 appending = file->f_flags & O_APPEND ? 1 : 0;
1955 direct_io = file->f_flags & O_DIRECT ? 1 : 0;
1956
1957 mutex_lock(&inode->i_mutex);
1958
1959 relock:
1960 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
1961 if (direct_io) {
1962 down_read(&inode->i_alloc_sem);
1963 have_alloc_sem = 1;
1964 }
1965
1966 /* concurrent O_DIRECT writes are allowed */
1967 rw_level = !direct_io;
1968 ret = ocfs2_rw_lock(inode, rw_level);
1969 if (ret < 0) {
1970 mlog_errno(ret);
1971 goto out_sems;
1972 }
1973
1974 can_do_direct = direct_io;
1975 ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos,
1976 iocb->ki_left, appending,
1977 &can_do_direct);
1978 if (ret < 0) {
1979 mlog_errno(ret);
1980 goto out;
1981 }
1982
1983 /*
1984 * We can't complete the direct I/O as requested, fall back to
1985 * buffered I/O.
1986 */
1987 if (direct_io && !can_do_direct) {
1988 ocfs2_rw_unlock(inode, rw_level);
1989 up_read(&inode->i_alloc_sem);
1990
1991 have_alloc_sem = 0;
1992 rw_level = -1;
1993
1994 direct_io = 0;
1995 goto relock;
1996 }
1997
1998 /*
1999 * To later detect whether a journal commit for sync writes is
2000 * necessary, we sample i_size, and cluster count here.
2001 */
2002 old_size = i_size_read(inode);
2003 old_clusters = OCFS2_I(inode)->ip_clusters;
2004
2005 /* communicate with ocfs2_dio_end_io */
2006 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2007
2008 if (direct_io) {
2009 ret = generic_segment_checks(iov, &nr_segs, &ocount,
2010 VERIFY_READ);
2011 if (ret)
2012 goto out_dio;
2013
2014 ret = generic_write_checks(file, ppos, &count,
2015 S_ISBLK(inode->i_mode));
2016 if (ret)
2017 goto out_dio;
2018
2019 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
2020 ppos, count, ocount);
2021 if (written < 0) {
2022 ret = written;
2023 goto out_dio;
2024 }
2025 } else {
2026 written = generic_file_aio_write_nolock(iocb, iov, nr_segs,
2027 *ppos);
2028 }
2029
2030 out_dio:
2031 /* buffered aio wouldn't have proper lock coverage today */
2032 BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2033
2034 if ((file->f_flags & O_SYNC && !direct_io) || IS_SYNC(inode)) {
2035 /*
2036 * The generic write paths have handled getting data
2037 * to disk, but since we don't make use of the dirty
2038 * inode list, a manual journal commit is necessary
2039 * here.
2040 */
2041 if (old_size != i_size_read(inode) ||
2042 old_clusters != OCFS2_I(inode)->ip_clusters) {
2043 ret = journal_force_commit(osb->journal->j_journal);
2044 if (ret < 0)
2045 written = ret;
2046 }
2047 }
2048
2049 /*
2050 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2051 * function pointer which is called when o_direct io completes so that
2052 * it can unlock our rw lock. (it's the clustered equivalent of
2053 * i_alloc_sem; protects truncate from racing with pending ios).
2054 * Unfortunately there are error cases which call end_io and others
2055 * that don't. so we don't have to unlock the rw_lock if either an
2056 * async dio is going to do it in the future or an end_io after an
2057 * error has already done it.
2058 */
2059 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2060 rw_level = -1;
2061 have_alloc_sem = 0;
2062 }
2063
2064 out:
2065 if (rw_level != -1)
2066 ocfs2_rw_unlock(inode, rw_level);
2067
2068 out_sems:
2069 if (have_alloc_sem)
2070 up_read(&inode->i_alloc_sem);
2071
2072 mutex_unlock(&inode->i_mutex);
2073
2074 mlog_exit(ret);
2075 return written ? written : ret;
2076 }
2077
2078 static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2079 struct file *out,
2080 loff_t *ppos,
2081 size_t len,
2082 unsigned int flags)
2083 {
2084 int ret;
2085 struct inode *inode = out->f_path.dentry->d_inode;
2086
2087 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
2088 (unsigned int)len,
2089 out->f_path.dentry->d_name.len,
2090 out->f_path.dentry->d_name.name);
2091
2092 inode_double_lock(inode, pipe->inode);
2093
2094 ret = ocfs2_rw_lock(inode, 1);
2095 if (ret < 0) {
2096 mlog_errno(ret);
2097 goto out;
2098 }
2099
2100 ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, ppos, len, 0,
2101 NULL);
2102 if (ret < 0) {
2103 mlog_errno(ret);
2104 goto out_unlock;
2105 }
2106
2107 ret = generic_file_splice_write_nolock(pipe, out, ppos, len, flags);
2108
2109 out_unlock:
2110 ocfs2_rw_unlock(inode, 1);
2111 out:
2112 inode_double_unlock(inode, pipe->inode);
2113
2114 mlog_exit(ret);
2115 return ret;
2116 }
2117
2118 static ssize_t ocfs2_file_splice_read(struct file *in,
2119 loff_t *ppos,
2120 struct pipe_inode_info *pipe,
2121 size_t len,
2122 unsigned int flags)
2123 {
2124 int ret = 0;
2125 struct inode *inode = in->f_path.dentry->d_inode;
2126
2127 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
2128 (unsigned int)len,
2129 in->f_path.dentry->d_name.len,
2130 in->f_path.dentry->d_name.name);
2131
2132 /*
2133 * See the comment in ocfs2_file_aio_read()
2134 */
2135 ret = ocfs2_inode_lock(inode, NULL, 0);
2136 if (ret < 0) {
2137 mlog_errno(ret);
2138 goto bail;
2139 }
2140 ocfs2_inode_unlock(inode, 0);
2141
2142 ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2143
2144 bail:
2145 mlog_exit(ret);
2146 return ret;
2147 }
2148
2149 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2150 const struct iovec *iov,
2151 unsigned long nr_segs,
2152 loff_t pos)
2153 {
2154 int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2155 struct file *filp = iocb->ki_filp;
2156 struct inode *inode = filp->f_path.dentry->d_inode;
2157
2158 mlog_entry("(0x%p, %u, '%.*s')\n", filp,
2159 (unsigned int)nr_segs,
2160 filp->f_path.dentry->d_name.len,
2161 filp->f_path.dentry->d_name.name);
2162
2163 if (!inode) {
2164 ret = -EINVAL;
2165 mlog_errno(ret);
2166 goto bail;
2167 }
2168
2169 /*
2170 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
2171 * need locks to protect pending reads from racing with truncate.
2172 */
2173 if (filp->f_flags & O_DIRECT) {
2174 down_read(&inode->i_alloc_sem);
2175 have_alloc_sem = 1;
2176
2177 ret = ocfs2_rw_lock(inode, 0);
2178 if (ret < 0) {
2179 mlog_errno(ret);
2180 goto bail;
2181 }
2182 rw_level = 0;
2183 /* communicate with ocfs2_dio_end_io */
2184 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2185 }
2186
2187 /*
2188 * We're fine letting folks race truncates and extending
2189 * writes with read across the cluster, just like they can
2190 * locally. Hence no rw_lock during read.
2191 *
2192 * Take and drop the meta data lock to update inode fields
2193 * like i_size. This allows the checks down below
2194 * generic_file_aio_read() a chance of actually working.
2195 */
2196 ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2197 if (ret < 0) {
2198 mlog_errno(ret);
2199 goto bail;
2200 }
2201 ocfs2_inode_unlock(inode, lock_level);
2202
2203 ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2204 if (ret == -EINVAL)
2205 mlog(0, "generic_file_aio_read returned -EINVAL\n");
2206
2207 /* buffered aio wouldn't have proper lock coverage today */
2208 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2209
2210 /* see ocfs2_file_aio_write */
2211 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2212 rw_level = -1;
2213 have_alloc_sem = 0;
2214 }
2215
2216 bail:
2217 if (have_alloc_sem)
2218 up_read(&inode->i_alloc_sem);
2219 if (rw_level != -1)
2220 ocfs2_rw_unlock(inode, rw_level);
2221 mlog_exit(ret);
2222
2223 return ret;
2224 }
2225
2226 const struct inode_operations ocfs2_file_iops = {
2227 .setattr = ocfs2_setattr,
2228 .getattr = ocfs2_getattr,
2229 .permission = ocfs2_permission,
2230 .fallocate = ocfs2_fallocate,
2231 };
2232
2233 const struct inode_operations ocfs2_special_file_iops = {
2234 .setattr = ocfs2_setattr,
2235 .getattr = ocfs2_getattr,
2236 .permission = ocfs2_permission,
2237 };
2238
2239 const struct file_operations ocfs2_fops = {
2240 .llseek = generic_file_llseek,
2241 .read = do_sync_read,
2242 .write = do_sync_write,
2243 .mmap = ocfs2_mmap,
2244 .fsync = ocfs2_sync_file,
2245 .release = ocfs2_file_release,
2246 .open = ocfs2_file_open,
2247 .aio_read = ocfs2_file_aio_read,
2248 .aio_write = ocfs2_file_aio_write,
2249 .unlocked_ioctl = ocfs2_ioctl,
2250 #ifdef CONFIG_COMPAT
2251 .compat_ioctl = ocfs2_compat_ioctl,
2252 #endif
2253 .flock = ocfs2_flock,
2254 .splice_read = ocfs2_file_splice_read,
2255 .splice_write = ocfs2_file_splice_write,
2256 };
2257
2258 const struct file_operations ocfs2_dops = {
2259 .llseek = generic_file_llseek,
2260 .read = generic_read_dir,
2261 .readdir = ocfs2_readdir,
2262 .fsync = ocfs2_sync_file,
2263 .release = ocfs2_dir_release,
2264 .open = ocfs2_dir_open,
2265 .unlocked_ioctl = ocfs2_ioctl,
2266 #ifdef CONFIG_COMPAT
2267 .compat_ioctl = ocfs2_compat_ioctl,
2268 #endif
2269 .flock = ocfs2_flock,
2270 };
kernel source for telekom puls (alcatel/mediatek)