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ocfs2: Avoid direct write if we fall back to buffered I/O
[deliverable/linux.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 #include <linux/quotaops.h>
39
40 #define MLOG_MASK_PREFIX ML_INODE
41 #include <cluster/masklog.h>
42
43 #include "ocfs2.h"
44
45 #include "alloc.h"
46 #include "aops.h"
47 #include "dir.h"
48 #include "dlmglue.h"
49 #include "extent_map.h"
50 #include "file.h"
51 #include "sysfile.h"
52 #include "inode.h"
53 #include "ioctl.h"
54 #include "journal.h"
55 #include "locks.h"
56 #include "mmap.h"
57 #include "suballoc.h"
58 #include "super.h"
59 #include "xattr.h"
60 #include "acl.h"
61 #include "quota.h"
62 #include "refcounttree.h"
63
64 #include "buffer_head_io.h"
65
66 static int ocfs2_sync_inode(struct inode *inode)
67 {
68 filemap_fdatawrite(inode->i_mapping);
69 return sync_mapping_buffers(inode->i_mapping);
70 }
71
72 static int ocfs2_init_file_private(struct inode *inode, struct file *file)
73 {
74 struct ocfs2_file_private *fp;
75
76 fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
77 if (!fp)
78 return -ENOMEM;
79
80 fp->fp_file = file;
81 mutex_init(&fp->fp_mutex);
82 ocfs2_file_lock_res_init(&fp->fp_flock, fp);
83 file->private_data = fp;
84
85 return 0;
86 }
87
88 static void ocfs2_free_file_private(struct inode *inode, struct file *file)
89 {
90 struct ocfs2_file_private *fp = file->private_data;
91 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
92
93 if (fp) {
94 ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
95 ocfs2_lock_res_free(&fp->fp_flock);
96 kfree(fp);
97 file->private_data = NULL;
98 }
99 }
100
101 static int ocfs2_file_open(struct inode *inode, struct file *file)
102 {
103 int status;
104 int mode = file->f_flags;
105 struct ocfs2_inode_info *oi = OCFS2_I(inode);
106
107 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
108 file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name);
109
110 if (file->f_mode & FMODE_WRITE)
111 dquot_initialize(inode);
112
113 spin_lock(&oi->ip_lock);
114
115 /* Check that the inode hasn't been wiped from disk by another
116 * node. If it hasn't then we're safe as long as we hold the
117 * spin lock until our increment of open count. */
118 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
119 spin_unlock(&oi->ip_lock);
120
121 status = -ENOENT;
122 goto leave;
123 }
124
125 if (mode & O_DIRECT)
126 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
127
128 oi->ip_open_count++;
129 spin_unlock(&oi->ip_lock);
130
131 status = ocfs2_init_file_private(inode, file);
132 if (status) {
133 /*
134 * We want to set open count back if we're failing the
135 * open.
136 */
137 spin_lock(&oi->ip_lock);
138 oi->ip_open_count--;
139 spin_unlock(&oi->ip_lock);
140 }
141
142 leave:
143 mlog_exit(status);
144 return status;
145 }
146
147 static int ocfs2_file_release(struct inode *inode, struct file *file)
148 {
149 struct ocfs2_inode_info *oi = OCFS2_I(inode);
150
151 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
152 file->f_path.dentry->d_name.len,
153 file->f_path.dentry->d_name.name);
154
155 spin_lock(&oi->ip_lock);
156 if (!--oi->ip_open_count)
157 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
158 spin_unlock(&oi->ip_lock);
159
160 ocfs2_free_file_private(inode, file);
161
162 mlog_exit(0);
163
164 return 0;
165 }
166
167 static int ocfs2_dir_open(struct inode *inode, struct file *file)
168 {
169 return ocfs2_init_file_private(inode, file);
170 }
171
172 static int ocfs2_dir_release(struct inode *inode, struct file *file)
173 {
174 ocfs2_free_file_private(inode, file);
175 return 0;
176 }
177
178 static int ocfs2_sync_file(struct file *file,
179 struct dentry *dentry,
180 int datasync)
181 {
182 int err = 0;
183 journal_t *journal;
184 struct inode *inode = dentry->d_inode;
185 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
186
187 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync,
188 dentry->d_name.len, dentry->d_name.name);
189
190 err = ocfs2_sync_inode(dentry->d_inode);
191 if (err)
192 goto bail;
193
194 if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
195 goto bail;
196
197 journal = osb->journal->j_journal;
198 err = jbd2_journal_force_commit(journal);
199
200 bail:
201 mlog_exit(err);
202
203 return (err < 0) ? -EIO : 0;
204 }
205
206 int ocfs2_should_update_atime(struct inode *inode,
207 struct vfsmount *vfsmnt)
208 {
209 struct timespec now;
210 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
211
212 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
213 return 0;
214
215 if ((inode->i_flags & S_NOATIME) ||
216 ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
217 return 0;
218
219 /*
220 * We can be called with no vfsmnt structure - NFSD will
221 * sometimes do this.
222 *
223 * Note that our action here is different than touch_atime() -
224 * if we can't tell whether this is a noatime mount, then we
225 * don't know whether to trust the value of s_atime_quantum.
226 */
227 if (vfsmnt == NULL)
228 return 0;
229
230 if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
231 ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
232 return 0;
233
234 if (vfsmnt->mnt_flags & MNT_RELATIME) {
235 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
236 (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
237 return 1;
238
239 return 0;
240 }
241
242 now = CURRENT_TIME;
243 if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
244 return 0;
245 else
246 return 1;
247 }
248
249 int ocfs2_update_inode_atime(struct inode *inode,
250 struct buffer_head *bh)
251 {
252 int ret;
253 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
254 handle_t *handle;
255 struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
256
257 mlog_entry_void();
258
259 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
260 if (IS_ERR(handle)) {
261 ret = PTR_ERR(handle);
262 mlog_errno(ret);
263 goto out;
264 }
265
266 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
267 OCFS2_JOURNAL_ACCESS_WRITE);
268 if (ret) {
269 mlog_errno(ret);
270 goto out_commit;
271 }
272
273 /*
274 * Don't use ocfs2_mark_inode_dirty() here as we don't always
275 * have i_mutex to guard against concurrent changes to other
276 * inode fields.
277 */
278 inode->i_atime = CURRENT_TIME;
279 di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
280 di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
281
282 ret = ocfs2_journal_dirty(handle, bh);
283 if (ret < 0)
284 mlog_errno(ret);
285
286 out_commit:
287 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
288 out:
289 mlog_exit(ret);
290 return ret;
291 }
292
293 static int ocfs2_set_inode_size(handle_t *handle,
294 struct inode *inode,
295 struct buffer_head *fe_bh,
296 u64 new_i_size)
297 {
298 int status;
299
300 mlog_entry_void();
301 i_size_write(inode, new_i_size);
302 inode->i_blocks = ocfs2_inode_sector_count(inode);
303 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
304
305 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
306 if (status < 0) {
307 mlog_errno(status);
308 goto bail;
309 }
310
311 bail:
312 mlog_exit(status);
313 return status;
314 }
315
316 int ocfs2_simple_size_update(struct inode *inode,
317 struct buffer_head *di_bh,
318 u64 new_i_size)
319 {
320 int ret;
321 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
322 handle_t *handle = NULL;
323
324 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
325 if (IS_ERR(handle)) {
326 ret = PTR_ERR(handle);
327 mlog_errno(ret);
328 goto out;
329 }
330
331 ret = ocfs2_set_inode_size(handle, inode, di_bh,
332 new_i_size);
333 if (ret < 0)
334 mlog_errno(ret);
335
336 ocfs2_commit_trans(osb, handle);
337 out:
338 return ret;
339 }
340
341 static int ocfs2_cow_file_pos(struct inode *inode,
342 struct buffer_head *fe_bh,
343 u64 offset)
344 {
345 int status;
346 u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
347 unsigned int num_clusters = 0;
348 unsigned int ext_flags = 0;
349
350 /*
351 * If the new offset is aligned to the range of the cluster, there is
352 * no space for ocfs2_zero_range_for_truncate to fill, so no need to
353 * CoW either.
354 */
355 if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
356 return 0;
357
358 status = ocfs2_get_clusters(inode, cpos, &phys,
359 &num_clusters, &ext_flags);
360 if (status) {
361 mlog_errno(status);
362 goto out;
363 }
364
365 if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
366 goto out;
367
368 return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1);
369
370 out:
371 return status;
372 }
373
374 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
375 struct inode *inode,
376 struct buffer_head *fe_bh,
377 u64 new_i_size)
378 {
379 int status;
380 handle_t *handle;
381 struct ocfs2_dinode *di;
382 u64 cluster_bytes;
383
384 mlog_entry_void();
385
386 /*
387 * We need to CoW the cluster contains the offset if it is reflinked
388 * since we will call ocfs2_zero_range_for_truncate later which will
389 * write "0" from offset to the end of the cluster.
390 */
391 status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
392 if (status) {
393 mlog_errno(status);
394 return status;
395 }
396
397 /* TODO: This needs to actually orphan the inode in this
398 * transaction. */
399
400 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
401 if (IS_ERR(handle)) {
402 status = PTR_ERR(handle);
403 mlog_errno(status);
404 goto out;
405 }
406
407 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
408 OCFS2_JOURNAL_ACCESS_WRITE);
409 if (status < 0) {
410 mlog_errno(status);
411 goto out_commit;
412 }
413
414 /*
415 * Do this before setting i_size.
416 */
417 cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
418 status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
419 cluster_bytes);
420 if (status) {
421 mlog_errno(status);
422 goto out_commit;
423 }
424
425 i_size_write(inode, new_i_size);
426 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
427
428 di = (struct ocfs2_dinode *) fe_bh->b_data;
429 di->i_size = cpu_to_le64(new_i_size);
430 di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
431 di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
432
433 status = ocfs2_journal_dirty(handle, fe_bh);
434 if (status < 0)
435 mlog_errno(status);
436
437 out_commit:
438 ocfs2_commit_trans(osb, handle);
439 out:
440
441 mlog_exit(status);
442 return status;
443 }
444
445 static int ocfs2_truncate_file(struct inode *inode,
446 struct buffer_head *di_bh,
447 u64 new_i_size)
448 {
449 int status = 0;
450 struct ocfs2_dinode *fe = NULL;
451 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
452 struct ocfs2_truncate_context *tc = NULL;
453
454 mlog_entry("(inode = %llu, new_i_size = %llu\n",
455 (unsigned long long)OCFS2_I(inode)->ip_blkno,
456 (unsigned long long)new_i_size);
457
458 /* We trust di_bh because it comes from ocfs2_inode_lock(), which
459 * already validated it */
460 fe = (struct ocfs2_dinode *) di_bh->b_data;
461
462 mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
463 "Inode %llu, inode i_size = %lld != di "
464 "i_size = %llu, i_flags = 0x%x\n",
465 (unsigned long long)OCFS2_I(inode)->ip_blkno,
466 i_size_read(inode),
467 (unsigned long long)le64_to_cpu(fe->i_size),
468 le32_to_cpu(fe->i_flags));
469
470 if (new_i_size > le64_to_cpu(fe->i_size)) {
471 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
472 (unsigned long long)le64_to_cpu(fe->i_size),
473 (unsigned long long)new_i_size);
474 status = -EINVAL;
475 mlog_errno(status);
476 goto bail;
477 }
478
479 mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
480 (unsigned long long)le64_to_cpu(fe->i_blkno),
481 (unsigned long long)le64_to_cpu(fe->i_size),
482 (unsigned long long)new_i_size);
483
484 /* lets handle the simple truncate cases before doing any more
485 * cluster locking. */
486 if (new_i_size == le64_to_cpu(fe->i_size))
487 goto bail;
488
489 down_write(&OCFS2_I(inode)->ip_alloc_sem);
490
491 /*
492 * The inode lock forced other nodes to sync and drop their
493 * pages, which (correctly) happens even if we have a truncate
494 * without allocation change - ocfs2 cluster sizes can be much
495 * greater than page size, so we have to truncate them
496 * anyway.
497 */
498 unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
499 truncate_inode_pages(inode->i_mapping, new_i_size);
500
501 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
502 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
503 i_size_read(inode), 1);
504 if (status)
505 mlog_errno(status);
506
507 goto bail_unlock_sem;
508 }
509
510 /* alright, we're going to need to do a full blown alloc size
511 * change. Orphan the inode so that recovery can complete the
512 * truncate if necessary. This does the task of marking
513 * i_size. */
514 status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
515 if (status < 0) {
516 mlog_errno(status);
517 goto bail_unlock_sem;
518 }
519
520 status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
521 if (status < 0) {
522 mlog_errno(status);
523 goto bail_unlock_sem;
524 }
525
526 status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
527 if (status < 0) {
528 mlog_errno(status);
529 goto bail_unlock_sem;
530 }
531
532 /* TODO: orphan dir cleanup here. */
533 bail_unlock_sem:
534 up_write(&OCFS2_I(inode)->ip_alloc_sem);
535
536 bail:
537 if (!status && OCFS2_I(inode)->ip_clusters == 0)
538 status = ocfs2_try_remove_refcount_tree(inode, di_bh);
539
540 mlog_exit(status);
541 return status;
542 }
543
544 /*
545 * extend file allocation only here.
546 * we'll update all the disk stuff, and oip->alloc_size
547 *
548 * expect stuff to be locked, a transaction started and enough data /
549 * metadata reservations in the contexts.
550 *
551 * Will return -EAGAIN, and a reason if a restart is needed.
552 * If passed in, *reason will always be set, even in error.
553 */
554 int ocfs2_add_inode_data(struct ocfs2_super *osb,
555 struct inode *inode,
556 u32 *logical_offset,
557 u32 clusters_to_add,
558 int mark_unwritten,
559 struct buffer_head *fe_bh,
560 handle_t *handle,
561 struct ocfs2_alloc_context *data_ac,
562 struct ocfs2_alloc_context *meta_ac,
563 enum ocfs2_alloc_restarted *reason_ret)
564 {
565 int ret;
566 struct ocfs2_extent_tree et;
567
568 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
569 ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
570 clusters_to_add, mark_unwritten,
571 data_ac, meta_ac, reason_ret);
572
573 return ret;
574 }
575
576 static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
577 u32 clusters_to_add, int mark_unwritten)
578 {
579 int status = 0;
580 int restart_func = 0;
581 int credits;
582 u32 prev_clusters;
583 struct buffer_head *bh = NULL;
584 struct ocfs2_dinode *fe = NULL;
585 handle_t *handle = NULL;
586 struct ocfs2_alloc_context *data_ac = NULL;
587 struct ocfs2_alloc_context *meta_ac = NULL;
588 enum ocfs2_alloc_restarted why;
589 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
590 struct ocfs2_extent_tree et;
591 int did_quota = 0;
592
593 mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
594
595 /*
596 * This function only exists for file systems which don't
597 * support holes.
598 */
599 BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
600
601 status = ocfs2_read_inode_block(inode, &bh);
602 if (status < 0) {
603 mlog_errno(status);
604 goto leave;
605 }
606 fe = (struct ocfs2_dinode *) bh->b_data;
607
608 restart_all:
609 BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
610
611 mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
612 "clusters_to_add = %u\n",
613 (unsigned long long)OCFS2_I(inode)->ip_blkno,
614 (long long)i_size_read(inode), le32_to_cpu(fe->i_clusters),
615 clusters_to_add);
616 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
617 status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
618 &data_ac, &meta_ac);
619 if (status) {
620 mlog_errno(status);
621 goto leave;
622 }
623
624 credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list,
625 clusters_to_add);
626 handle = ocfs2_start_trans(osb, credits);
627 if (IS_ERR(handle)) {
628 status = PTR_ERR(handle);
629 handle = NULL;
630 mlog_errno(status);
631 goto leave;
632 }
633
634 restarted_transaction:
635 status = dquot_alloc_space_nodirty(inode,
636 ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
637 if (status)
638 goto leave;
639 did_quota = 1;
640
641 /* reserve a write to the file entry early on - that we if we
642 * run out of credits in the allocation path, we can still
643 * update i_size. */
644 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
645 OCFS2_JOURNAL_ACCESS_WRITE);
646 if (status < 0) {
647 mlog_errno(status);
648 goto leave;
649 }
650
651 prev_clusters = OCFS2_I(inode)->ip_clusters;
652
653 status = ocfs2_add_inode_data(osb,
654 inode,
655 &logical_start,
656 clusters_to_add,
657 mark_unwritten,
658 bh,
659 handle,
660 data_ac,
661 meta_ac,
662 &why);
663 if ((status < 0) && (status != -EAGAIN)) {
664 if (status != -ENOSPC)
665 mlog_errno(status);
666 goto leave;
667 }
668
669 status = ocfs2_journal_dirty(handle, bh);
670 if (status < 0) {
671 mlog_errno(status);
672 goto leave;
673 }
674
675 spin_lock(&OCFS2_I(inode)->ip_lock);
676 clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
677 spin_unlock(&OCFS2_I(inode)->ip_lock);
678 /* Release unused quota reservation */
679 dquot_free_space(inode,
680 ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
681 did_quota = 0;
682
683 if (why != RESTART_NONE && clusters_to_add) {
684 if (why == RESTART_META) {
685 mlog(0, "restarting function.\n");
686 restart_func = 1;
687 status = 0;
688 } else {
689 BUG_ON(why != RESTART_TRANS);
690
691 mlog(0, "restarting transaction.\n");
692 /* TODO: This can be more intelligent. */
693 credits = ocfs2_calc_extend_credits(osb->sb,
694 &fe->id2.i_list,
695 clusters_to_add);
696 status = ocfs2_extend_trans(handle, credits);
697 if (status < 0) {
698 /* handle still has to be committed at
699 * this point. */
700 status = -ENOMEM;
701 mlog_errno(status);
702 goto leave;
703 }
704 goto restarted_transaction;
705 }
706 }
707
708 mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
709 le32_to_cpu(fe->i_clusters),
710 (unsigned long long)le64_to_cpu(fe->i_size));
711 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
712 OCFS2_I(inode)->ip_clusters, (long long)i_size_read(inode));
713
714 leave:
715 if (status < 0 && did_quota)
716 dquot_free_space(inode,
717 ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
718 if (handle) {
719 ocfs2_commit_trans(osb, handle);
720 handle = NULL;
721 }
722 if (data_ac) {
723 ocfs2_free_alloc_context(data_ac);
724 data_ac = NULL;
725 }
726 if (meta_ac) {
727 ocfs2_free_alloc_context(meta_ac);
728 meta_ac = NULL;
729 }
730 if ((!status) && restart_func) {
731 restart_func = 0;
732 goto restart_all;
733 }
734 brelse(bh);
735 bh = NULL;
736
737 mlog_exit(status);
738 return status;
739 }
740
741 /* Some parts of this taken from generic_cont_expand, which turned out
742 * to be too fragile to do exactly what we need without us having to
743 * worry about recursive locking in ->write_begin() and ->write_end(). */
744 static int ocfs2_write_zero_page(struct inode *inode,
745 u64 size)
746 {
747 struct address_space *mapping = inode->i_mapping;
748 struct page *page;
749 unsigned long index;
750 unsigned int offset;
751 handle_t *handle = NULL;
752 int ret;
753
754 offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
755 /* ugh. in prepare/commit_write, if from==to==start of block, we
756 ** skip the prepare. make sure we never send an offset for the start
757 ** of a block
758 */
759 if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
760 offset++;
761 }
762 index = size >> PAGE_CACHE_SHIFT;
763
764 page = grab_cache_page(mapping, index);
765 if (!page) {
766 ret = -ENOMEM;
767 mlog_errno(ret);
768 goto out;
769 }
770
771 ret = ocfs2_prepare_write_nolock(inode, page, offset, offset);
772 if (ret < 0) {
773 mlog_errno(ret);
774 goto out_unlock;
775 }
776
777 if (ocfs2_should_order_data(inode)) {
778 handle = ocfs2_start_walk_page_trans(inode, page, offset,
779 offset);
780 if (IS_ERR(handle)) {
781 ret = PTR_ERR(handle);
782 handle = NULL;
783 goto out_unlock;
784 }
785 }
786
787 /* must not update i_size! */
788 ret = block_commit_write(page, offset, offset);
789 if (ret < 0)
790 mlog_errno(ret);
791 else
792 ret = 0;
793
794 if (handle)
795 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
796 out_unlock:
797 unlock_page(page);
798 page_cache_release(page);
799 out:
800 return ret;
801 }
802
803 static int ocfs2_zero_extend(struct inode *inode,
804 u64 zero_to_size)
805 {
806 int ret = 0;
807 u64 start_off;
808 struct super_block *sb = inode->i_sb;
809
810 start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
811 while (start_off < zero_to_size) {
812 ret = ocfs2_write_zero_page(inode, start_off);
813 if (ret < 0) {
814 mlog_errno(ret);
815 goto out;
816 }
817
818 start_off += sb->s_blocksize;
819
820 /*
821 * Very large extends have the potential to lock up
822 * the cpu for extended periods of time.
823 */
824 cond_resched();
825 }
826
827 out:
828 return ret;
829 }
830
831 int ocfs2_extend_no_holes(struct inode *inode, u64 new_i_size, u64 zero_to)
832 {
833 int ret;
834 u32 clusters_to_add;
835 struct ocfs2_inode_info *oi = OCFS2_I(inode);
836
837 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
838 if (clusters_to_add < oi->ip_clusters)
839 clusters_to_add = 0;
840 else
841 clusters_to_add -= oi->ip_clusters;
842
843 if (clusters_to_add) {
844 ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
845 clusters_to_add, 0);
846 if (ret) {
847 mlog_errno(ret);
848 goto out;
849 }
850 }
851
852 /*
853 * Call this even if we don't add any clusters to the tree. We
854 * still need to zero the area between the old i_size and the
855 * new i_size.
856 */
857 ret = ocfs2_zero_extend(inode, zero_to);
858 if (ret < 0)
859 mlog_errno(ret);
860
861 out:
862 return ret;
863 }
864
865 static int ocfs2_extend_file(struct inode *inode,
866 struct buffer_head *di_bh,
867 u64 new_i_size)
868 {
869 int ret = 0;
870 struct ocfs2_inode_info *oi = OCFS2_I(inode);
871
872 BUG_ON(!di_bh);
873
874 /* setattr sometimes calls us like this. */
875 if (new_i_size == 0)
876 goto out;
877
878 if (i_size_read(inode) == new_i_size)
879 goto out;
880 BUG_ON(new_i_size < i_size_read(inode));
881
882 /*
883 * Fall through for converting inline data, even if the fs
884 * supports sparse files.
885 *
886 * The check for inline data here is legal - nobody can add
887 * the feature since we have i_mutex. We must check it again
888 * after acquiring ip_alloc_sem though, as paths like mmap
889 * might have raced us to converting the inode to extents.
890 */
891 if (!(oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
892 && ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
893 goto out_update_size;
894
895 /*
896 * The alloc sem blocks people in read/write from reading our
897 * allocation until we're done changing it. We depend on
898 * i_mutex to block other extend/truncate calls while we're
899 * here.
900 */
901 down_write(&oi->ip_alloc_sem);
902
903 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
904 /*
905 * We can optimize small extends by keeping the inodes
906 * inline data.
907 */
908 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
909 up_write(&oi->ip_alloc_sem);
910 goto out_update_size;
911 }
912
913 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
914 if (ret) {
915 up_write(&oi->ip_alloc_sem);
916
917 mlog_errno(ret);
918 goto out;
919 }
920 }
921
922 if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
923 ret = ocfs2_extend_no_holes(inode, new_i_size, new_i_size);
924
925 up_write(&oi->ip_alloc_sem);
926
927 if (ret < 0) {
928 mlog_errno(ret);
929 goto out;
930 }
931
932 out_update_size:
933 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
934 if (ret < 0)
935 mlog_errno(ret);
936
937 out:
938 return ret;
939 }
940
941 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
942 {
943 int status = 0, size_change;
944 struct inode *inode = dentry->d_inode;
945 struct super_block *sb = inode->i_sb;
946 struct ocfs2_super *osb = OCFS2_SB(sb);
947 struct buffer_head *bh = NULL;
948 handle_t *handle = NULL;
949 int qtype;
950 struct dquot *transfer_from[MAXQUOTAS] = { };
951 struct dquot *transfer_to[MAXQUOTAS] = { };
952
953 mlog_entry("(0x%p, '%.*s')\n", dentry,
954 dentry->d_name.len, dentry->d_name.name);
955
956 /* ensuring we don't even attempt to truncate a symlink */
957 if (S_ISLNK(inode->i_mode))
958 attr->ia_valid &= ~ATTR_SIZE;
959
960 if (attr->ia_valid & ATTR_MODE)
961 mlog(0, "mode change: %d\n", attr->ia_mode);
962 if (attr->ia_valid & ATTR_UID)
963 mlog(0, "uid change: %d\n", attr->ia_uid);
964 if (attr->ia_valid & ATTR_GID)
965 mlog(0, "gid change: %d\n", attr->ia_gid);
966 if (attr->ia_valid & ATTR_SIZE)
967 mlog(0, "size change...\n");
968 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
969 mlog(0, "time change...\n");
970
971 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
972 | ATTR_GID | ATTR_UID | ATTR_MODE)
973 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
974 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
975 return 0;
976 }
977
978 status = inode_change_ok(inode, attr);
979 if (status)
980 return status;
981
982 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
983 if (size_change) {
984 dquot_initialize(inode);
985
986 status = ocfs2_rw_lock(inode, 1);
987 if (status < 0) {
988 mlog_errno(status);
989 goto bail;
990 }
991 }
992
993 status = ocfs2_inode_lock(inode, &bh, 1);
994 if (status < 0) {
995 if (status != -ENOENT)
996 mlog_errno(status);
997 goto bail_unlock_rw;
998 }
999
1000 if (size_change && attr->ia_size != i_size_read(inode)) {
1001 status = inode_newsize_ok(inode, attr->ia_size);
1002 if (status)
1003 goto bail_unlock;
1004
1005 if (i_size_read(inode) > attr->ia_size) {
1006 if (ocfs2_should_order_data(inode)) {
1007 status = ocfs2_begin_ordered_truncate(inode,
1008 attr->ia_size);
1009 if (status)
1010 goto bail_unlock;
1011 }
1012 status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1013 } else
1014 status = ocfs2_extend_file(inode, bh, attr->ia_size);
1015 if (status < 0) {
1016 if (status != -ENOSPC)
1017 mlog_errno(status);
1018 status = -ENOSPC;
1019 goto bail_unlock;
1020 }
1021 }
1022
1023 if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
1024 (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
1025 /*
1026 * Gather pointers to quota structures so that allocation /
1027 * freeing of quota structures happens here and not inside
1028 * dquot_transfer() where we have problems with lock ordering
1029 */
1030 if (attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid
1031 && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1032 OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1033 transfer_to[USRQUOTA] = dqget(sb, attr->ia_uid,
1034 USRQUOTA);
1035 transfer_from[USRQUOTA] = dqget(sb, inode->i_uid,
1036 USRQUOTA);
1037 if (!transfer_to[USRQUOTA] || !transfer_from[USRQUOTA]) {
1038 status = -ESRCH;
1039 goto bail_unlock;
1040 }
1041 }
1042 if (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid
1043 && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1044 OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1045 transfer_to[GRPQUOTA] = dqget(sb, attr->ia_gid,
1046 GRPQUOTA);
1047 transfer_from[GRPQUOTA] = dqget(sb, inode->i_gid,
1048 GRPQUOTA);
1049 if (!transfer_to[GRPQUOTA] || !transfer_from[GRPQUOTA]) {
1050 status = -ESRCH;
1051 goto bail_unlock;
1052 }
1053 }
1054 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1055 2 * ocfs2_quota_trans_credits(sb));
1056 if (IS_ERR(handle)) {
1057 status = PTR_ERR(handle);
1058 mlog_errno(status);
1059 goto bail_unlock;
1060 }
1061 status = dquot_transfer(inode, attr);
1062 if (status < 0)
1063 goto bail_commit;
1064 } else {
1065 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1066 if (IS_ERR(handle)) {
1067 status = PTR_ERR(handle);
1068 mlog_errno(status);
1069 goto bail_unlock;
1070 }
1071 }
1072
1073 /*
1074 * This will intentionally not wind up calling vmtruncate(),
1075 * since all the work for a size change has been done above.
1076 * Otherwise, we could get into problems with truncate as
1077 * ip_alloc_sem is used there to protect against i_size
1078 * changes.
1079 */
1080 status = inode_setattr(inode, attr);
1081 if (status < 0) {
1082 mlog_errno(status);
1083 goto bail_commit;
1084 }
1085
1086 status = ocfs2_mark_inode_dirty(handle, inode, bh);
1087 if (status < 0)
1088 mlog_errno(status);
1089
1090 bail_commit:
1091 ocfs2_commit_trans(osb, handle);
1092 bail_unlock:
1093 ocfs2_inode_unlock(inode, 1);
1094 bail_unlock_rw:
1095 if (size_change)
1096 ocfs2_rw_unlock(inode, 1);
1097 bail:
1098 brelse(bh);
1099
1100 /* Release quota pointers in case we acquired them */
1101 for (qtype = 0; qtype < MAXQUOTAS; qtype++) {
1102 dqput(transfer_to[qtype]);
1103 dqput(transfer_from[qtype]);
1104 }
1105
1106 if (!status && attr->ia_valid & ATTR_MODE) {
1107 status = ocfs2_acl_chmod(inode);
1108 if (status < 0)
1109 mlog_errno(status);
1110 }
1111
1112 mlog_exit(status);
1113 return status;
1114 }
1115
1116 int ocfs2_getattr(struct vfsmount *mnt,
1117 struct dentry *dentry,
1118 struct kstat *stat)
1119 {
1120 struct inode *inode = dentry->d_inode;
1121 struct super_block *sb = dentry->d_inode->i_sb;
1122 struct ocfs2_super *osb = sb->s_fs_info;
1123 int err;
1124
1125 mlog_entry_void();
1126
1127 err = ocfs2_inode_revalidate(dentry);
1128 if (err) {
1129 if (err != -ENOENT)
1130 mlog_errno(err);
1131 goto bail;
1132 }
1133
1134 generic_fillattr(inode, stat);
1135
1136 /* We set the blksize from the cluster size for performance */
1137 stat->blksize = osb->s_clustersize;
1138
1139 bail:
1140 mlog_exit(err);
1141
1142 return err;
1143 }
1144
1145 int ocfs2_permission(struct inode *inode, int mask)
1146 {
1147 int ret;
1148
1149 mlog_entry_void();
1150
1151 ret = ocfs2_inode_lock(inode, NULL, 0);
1152 if (ret) {
1153 if (ret != -ENOENT)
1154 mlog_errno(ret);
1155 goto out;
1156 }
1157
1158 ret = generic_permission(inode, mask, ocfs2_check_acl);
1159
1160 ocfs2_inode_unlock(inode, 0);
1161 out:
1162 mlog_exit(ret);
1163 return ret;
1164 }
1165
1166 static int __ocfs2_write_remove_suid(struct inode *inode,
1167 struct buffer_head *bh)
1168 {
1169 int ret;
1170 handle_t *handle;
1171 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1172 struct ocfs2_dinode *di;
1173
1174 mlog_entry("(Inode %llu, mode 0%o)\n",
1175 (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
1176
1177 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1178 if (IS_ERR(handle)) {
1179 ret = PTR_ERR(handle);
1180 mlog_errno(ret);
1181 goto out;
1182 }
1183
1184 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1185 OCFS2_JOURNAL_ACCESS_WRITE);
1186 if (ret < 0) {
1187 mlog_errno(ret);
1188 goto out_trans;
1189 }
1190
1191 inode->i_mode &= ~S_ISUID;
1192 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1193 inode->i_mode &= ~S_ISGID;
1194
1195 di = (struct ocfs2_dinode *) bh->b_data;
1196 di->i_mode = cpu_to_le16(inode->i_mode);
1197
1198 ret = ocfs2_journal_dirty(handle, bh);
1199 if (ret < 0)
1200 mlog_errno(ret);
1201
1202 out_trans:
1203 ocfs2_commit_trans(osb, handle);
1204 out:
1205 mlog_exit(ret);
1206 return ret;
1207 }
1208
1209 /*
1210 * Will look for holes and unwritten extents in the range starting at
1211 * pos for count bytes (inclusive).
1212 */
1213 static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1214 size_t count)
1215 {
1216 int ret = 0;
1217 unsigned int extent_flags;
1218 u32 cpos, clusters, extent_len, phys_cpos;
1219 struct super_block *sb = inode->i_sb;
1220
1221 cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1222 clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1223
1224 while (clusters) {
1225 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1226 &extent_flags);
1227 if (ret < 0) {
1228 mlog_errno(ret);
1229 goto out;
1230 }
1231
1232 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1233 ret = 1;
1234 break;
1235 }
1236
1237 if (extent_len > clusters)
1238 extent_len = clusters;
1239
1240 clusters -= extent_len;
1241 cpos += extent_len;
1242 }
1243 out:
1244 return ret;
1245 }
1246
1247 static int ocfs2_write_remove_suid(struct inode *inode)
1248 {
1249 int ret;
1250 struct buffer_head *bh = NULL;
1251
1252 ret = ocfs2_read_inode_block(inode, &bh);
1253 if (ret < 0) {
1254 mlog_errno(ret);
1255 goto out;
1256 }
1257
1258 ret = __ocfs2_write_remove_suid(inode, bh);
1259 out:
1260 brelse(bh);
1261 return ret;
1262 }
1263
1264 /*
1265 * Allocate enough extents to cover the region starting at byte offset
1266 * start for len bytes. Existing extents are skipped, any extents
1267 * added are marked as "unwritten".
1268 */
1269 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1270 u64 start, u64 len)
1271 {
1272 int ret;
1273 u32 cpos, phys_cpos, clusters, alloc_size;
1274 u64 end = start + len;
1275 struct buffer_head *di_bh = NULL;
1276
1277 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1278 ret = ocfs2_read_inode_block(inode, &di_bh);
1279 if (ret) {
1280 mlog_errno(ret);
1281 goto out;
1282 }
1283
1284 /*
1285 * Nothing to do if the requested reservation range
1286 * fits within the inode.
1287 */
1288 if (ocfs2_size_fits_inline_data(di_bh, end))
1289 goto out;
1290
1291 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1292 if (ret) {
1293 mlog_errno(ret);
1294 goto out;
1295 }
1296 }
1297
1298 /*
1299 * We consider both start and len to be inclusive.
1300 */
1301 cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1302 clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1303 clusters -= cpos;
1304
1305 while (clusters) {
1306 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1307 &alloc_size, NULL);
1308 if (ret) {
1309 mlog_errno(ret);
1310 goto out;
1311 }
1312
1313 /*
1314 * Hole or existing extent len can be arbitrary, so
1315 * cap it to our own allocation request.
1316 */
1317 if (alloc_size > clusters)
1318 alloc_size = clusters;
1319
1320 if (phys_cpos) {
1321 /*
1322 * We already have an allocation at this
1323 * region so we can safely skip it.
1324 */
1325 goto next;
1326 }
1327
1328 ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1329 if (ret) {
1330 if (ret != -ENOSPC)
1331 mlog_errno(ret);
1332 goto out;
1333 }
1334
1335 next:
1336 cpos += alloc_size;
1337 clusters -= alloc_size;
1338 }
1339
1340 ret = 0;
1341 out:
1342
1343 brelse(di_bh);
1344 return ret;
1345 }
1346
1347 /*
1348 * Truncate a byte range, avoiding pages within partial clusters. This
1349 * preserves those pages for the zeroing code to write to.
1350 */
1351 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1352 u64 byte_len)
1353 {
1354 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1355 loff_t start, end;
1356 struct address_space *mapping = inode->i_mapping;
1357
1358 start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1359 end = byte_start + byte_len;
1360 end = end & ~(osb->s_clustersize - 1);
1361
1362 if (start < end) {
1363 unmap_mapping_range(mapping, start, end - start, 0);
1364 truncate_inode_pages_range(mapping, start, end - 1);
1365 }
1366 }
1367
1368 static int ocfs2_zero_partial_clusters(struct inode *inode,
1369 u64 start, u64 len)
1370 {
1371 int ret = 0;
1372 u64 tmpend, end = start + len;
1373 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1374 unsigned int csize = osb->s_clustersize;
1375 handle_t *handle;
1376
1377 /*
1378 * The "start" and "end" values are NOT necessarily part of
1379 * the range whose allocation is being deleted. Rather, this
1380 * is what the user passed in with the request. We must zero
1381 * partial clusters here. There's no need to worry about
1382 * physical allocation - the zeroing code knows to skip holes.
1383 */
1384 mlog(0, "byte start: %llu, end: %llu\n",
1385 (unsigned long long)start, (unsigned long long)end);
1386
1387 /*
1388 * If both edges are on a cluster boundary then there's no
1389 * zeroing required as the region is part of the allocation to
1390 * be truncated.
1391 */
1392 if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1393 goto out;
1394
1395 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1396 if (IS_ERR(handle)) {
1397 ret = PTR_ERR(handle);
1398 mlog_errno(ret);
1399 goto out;
1400 }
1401
1402 /*
1403 * We want to get the byte offset of the end of the 1st cluster.
1404 */
1405 tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1406 if (tmpend > end)
1407 tmpend = end;
1408
1409 mlog(0, "1st range: start: %llu, tmpend: %llu\n",
1410 (unsigned long long)start, (unsigned long long)tmpend);
1411
1412 ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1413 if (ret)
1414 mlog_errno(ret);
1415
1416 if (tmpend < end) {
1417 /*
1418 * This may make start and end equal, but the zeroing
1419 * code will skip any work in that case so there's no
1420 * need to catch it up here.
1421 */
1422 start = end & ~(osb->s_clustersize - 1);
1423
1424 mlog(0, "2nd range: start: %llu, end: %llu\n",
1425 (unsigned long long)start, (unsigned long long)end);
1426
1427 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1428 if (ret)
1429 mlog_errno(ret);
1430 }
1431
1432 ocfs2_commit_trans(osb, handle);
1433 out:
1434 return ret;
1435 }
1436
1437 static int ocfs2_remove_inode_range(struct inode *inode,
1438 struct buffer_head *di_bh, u64 byte_start,
1439 u64 byte_len)
1440 {
1441 int ret = 0;
1442 u32 trunc_start, trunc_len, cpos, phys_cpos, alloc_size;
1443 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1444 struct ocfs2_cached_dealloc_ctxt dealloc;
1445 struct address_space *mapping = inode->i_mapping;
1446 struct ocfs2_extent_tree et;
1447
1448 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1449 ocfs2_init_dealloc_ctxt(&dealloc);
1450
1451 if (byte_len == 0)
1452 return 0;
1453
1454 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1455 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1456 byte_start + byte_len, 0);
1457 if (ret) {
1458 mlog_errno(ret);
1459 goto out;
1460 }
1461 /*
1462 * There's no need to get fancy with the page cache
1463 * truncate of an inline-data inode. We're talking
1464 * about less than a page here, which will be cached
1465 * in the dinode buffer anyway.
1466 */
1467 unmap_mapping_range(mapping, 0, 0, 0);
1468 truncate_inode_pages(mapping, 0);
1469 goto out;
1470 }
1471
1472 trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1473 trunc_len = (byte_start + byte_len) >> osb->s_clustersize_bits;
1474 if (trunc_len >= trunc_start)
1475 trunc_len -= trunc_start;
1476 else
1477 trunc_len = 0;
1478
1479 mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u\n",
1480 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1481 (unsigned long long)byte_start,
1482 (unsigned long long)byte_len, trunc_start, trunc_len);
1483
1484 ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1485 if (ret) {
1486 mlog_errno(ret);
1487 goto out;
1488 }
1489
1490 cpos = trunc_start;
1491 while (trunc_len) {
1492 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1493 &alloc_size, NULL);
1494 if (ret) {
1495 mlog_errno(ret);
1496 goto out;
1497 }
1498
1499 if (alloc_size > trunc_len)
1500 alloc_size = trunc_len;
1501
1502 /* Only do work for non-holes */
1503 if (phys_cpos != 0) {
1504 ret = ocfs2_remove_btree_range(inode, &et, cpos,
1505 phys_cpos, alloc_size,
1506 &dealloc);
1507 if (ret) {
1508 mlog_errno(ret);
1509 goto out;
1510 }
1511 }
1512
1513 cpos += alloc_size;
1514 trunc_len -= alloc_size;
1515 }
1516
1517 ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1518
1519 out:
1520 ocfs2_schedule_truncate_log_flush(osb, 1);
1521 ocfs2_run_deallocs(osb, &dealloc);
1522
1523 return ret;
1524 }
1525
1526 /*
1527 * Parts of this function taken from xfs_change_file_space()
1528 */
1529 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1530 loff_t f_pos, unsigned int cmd,
1531 struct ocfs2_space_resv *sr,
1532 int change_size)
1533 {
1534 int ret;
1535 s64 llen;
1536 loff_t size;
1537 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1538 struct buffer_head *di_bh = NULL;
1539 handle_t *handle;
1540 unsigned long long max_off = inode->i_sb->s_maxbytes;
1541
1542 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1543 return -EROFS;
1544
1545 mutex_lock(&inode->i_mutex);
1546
1547 /*
1548 * This prevents concurrent writes on other nodes
1549 */
1550 ret = ocfs2_rw_lock(inode, 1);
1551 if (ret) {
1552 mlog_errno(ret);
1553 goto out;
1554 }
1555
1556 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1557 if (ret) {
1558 mlog_errno(ret);
1559 goto out_rw_unlock;
1560 }
1561
1562 if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1563 ret = -EPERM;
1564 goto out_inode_unlock;
1565 }
1566
1567 switch (sr->l_whence) {
1568 case 0: /*SEEK_SET*/
1569 break;
1570 case 1: /*SEEK_CUR*/
1571 sr->l_start += f_pos;
1572 break;
1573 case 2: /*SEEK_END*/
1574 sr->l_start += i_size_read(inode);
1575 break;
1576 default:
1577 ret = -EINVAL;
1578 goto out_inode_unlock;
1579 }
1580 sr->l_whence = 0;
1581
1582 llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1583
1584 if (sr->l_start < 0
1585 || sr->l_start > max_off
1586 || (sr->l_start + llen) < 0
1587 || (sr->l_start + llen) > max_off) {
1588 ret = -EINVAL;
1589 goto out_inode_unlock;
1590 }
1591 size = sr->l_start + sr->l_len;
1592
1593 if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
1594 if (sr->l_len <= 0) {
1595 ret = -EINVAL;
1596 goto out_inode_unlock;
1597 }
1598 }
1599
1600 if (file && should_remove_suid(file->f_path.dentry)) {
1601 ret = __ocfs2_write_remove_suid(inode, di_bh);
1602 if (ret) {
1603 mlog_errno(ret);
1604 goto out_inode_unlock;
1605 }
1606 }
1607
1608 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1609 switch (cmd) {
1610 case OCFS2_IOC_RESVSP:
1611 case OCFS2_IOC_RESVSP64:
1612 /*
1613 * This takes unsigned offsets, but the signed ones we
1614 * pass have been checked against overflow above.
1615 */
1616 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1617 sr->l_len);
1618 break;
1619 case OCFS2_IOC_UNRESVSP:
1620 case OCFS2_IOC_UNRESVSP64:
1621 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1622 sr->l_len);
1623 break;
1624 default:
1625 ret = -EINVAL;
1626 }
1627 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1628 if (ret) {
1629 mlog_errno(ret);
1630 goto out_inode_unlock;
1631 }
1632
1633 /*
1634 * We update c/mtime for these changes
1635 */
1636 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1637 if (IS_ERR(handle)) {
1638 ret = PTR_ERR(handle);
1639 mlog_errno(ret);
1640 goto out_inode_unlock;
1641 }
1642
1643 if (change_size && i_size_read(inode) < size)
1644 i_size_write(inode, size);
1645
1646 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1647 ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1648 if (ret < 0)
1649 mlog_errno(ret);
1650
1651 ocfs2_commit_trans(osb, handle);
1652
1653 out_inode_unlock:
1654 brelse(di_bh);
1655 ocfs2_inode_unlock(inode, 1);
1656 out_rw_unlock:
1657 ocfs2_rw_unlock(inode, 1);
1658
1659 out:
1660 mutex_unlock(&inode->i_mutex);
1661 return ret;
1662 }
1663
1664 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1665 struct ocfs2_space_resv *sr)
1666 {
1667 struct inode *inode = file->f_path.dentry->d_inode;
1668 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1669
1670 if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1671 !ocfs2_writes_unwritten_extents(osb))
1672 return -ENOTTY;
1673 else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1674 !ocfs2_sparse_alloc(osb))
1675 return -ENOTTY;
1676
1677 if (!S_ISREG(inode->i_mode))
1678 return -EINVAL;
1679
1680 if (!(file->f_mode & FMODE_WRITE))
1681 return -EBADF;
1682
1683 return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1684 }
1685
1686 static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset,
1687 loff_t len)
1688 {
1689 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1690 struct ocfs2_space_resv sr;
1691 int change_size = 1;
1692
1693 if (!ocfs2_writes_unwritten_extents(osb))
1694 return -EOPNOTSUPP;
1695
1696 if (S_ISDIR(inode->i_mode))
1697 return -ENODEV;
1698
1699 if (mode & FALLOC_FL_KEEP_SIZE)
1700 change_size = 0;
1701
1702 sr.l_whence = 0;
1703 sr.l_start = (s64)offset;
1704 sr.l_len = (s64)len;
1705
1706 return __ocfs2_change_file_space(NULL, inode, offset,
1707 OCFS2_IOC_RESVSP64, &sr, change_size);
1708 }
1709
1710 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
1711 size_t count)
1712 {
1713 int ret = 0;
1714 unsigned int extent_flags;
1715 u32 cpos, clusters, extent_len, phys_cpos;
1716 struct super_block *sb = inode->i_sb;
1717
1718 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
1719 !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
1720 OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
1721 return 0;
1722
1723 cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1724 clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1725
1726 while (clusters) {
1727 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1728 &extent_flags);
1729 if (ret < 0) {
1730 mlog_errno(ret);
1731 goto out;
1732 }
1733
1734 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
1735 ret = 1;
1736 break;
1737 }
1738
1739 if (extent_len > clusters)
1740 extent_len = clusters;
1741
1742 clusters -= extent_len;
1743 cpos += extent_len;
1744 }
1745 out:
1746 return ret;
1747 }
1748
1749 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
1750 loff_t pos, size_t count,
1751 int *meta_level)
1752 {
1753 int ret;
1754 struct buffer_head *di_bh = NULL;
1755 u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1756 u32 clusters =
1757 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
1758
1759 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1760 if (ret) {
1761 mlog_errno(ret);
1762 goto out;
1763 }
1764
1765 *meta_level = 1;
1766
1767 ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
1768 if (ret)
1769 mlog_errno(ret);
1770 out:
1771 brelse(di_bh);
1772 return ret;
1773 }
1774
1775 static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
1776 loff_t *ppos,
1777 size_t count,
1778 int appending,
1779 int *direct_io,
1780 int *has_refcount)
1781 {
1782 int ret = 0, meta_level = 0;
1783 struct inode *inode = dentry->d_inode;
1784 loff_t saved_pos, end;
1785
1786 /*
1787 * We start with a read level meta lock and only jump to an ex
1788 * if we need to make modifications here.
1789 */
1790 for(;;) {
1791 ret = ocfs2_inode_lock(inode, NULL, meta_level);
1792 if (ret < 0) {
1793 meta_level = -1;
1794 mlog_errno(ret);
1795 goto out;
1796 }
1797
1798 /* Clear suid / sgid if necessary. We do this here
1799 * instead of later in the write path because
1800 * remove_suid() calls ->setattr without any hint that
1801 * we may have already done our cluster locking. Since
1802 * ocfs2_setattr() *must* take cluster locks to
1803 * proceeed, this will lead us to recursively lock the
1804 * inode. There's also the dinode i_size state which
1805 * can be lost via setattr during extending writes (we
1806 * set inode->i_size at the end of a write. */
1807 if (should_remove_suid(dentry)) {
1808 if (meta_level == 0) {
1809 ocfs2_inode_unlock(inode, meta_level);
1810 meta_level = 1;
1811 continue;
1812 }
1813
1814 ret = ocfs2_write_remove_suid(inode);
1815 if (ret < 0) {
1816 mlog_errno(ret);
1817 goto out_unlock;
1818 }
1819 }
1820
1821 /* work on a copy of ppos until we're sure that we won't have
1822 * to recalculate it due to relocking. */
1823 if (appending) {
1824 saved_pos = i_size_read(inode);
1825 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
1826 } else {
1827 saved_pos = *ppos;
1828 }
1829
1830 end = saved_pos + count;
1831
1832 ret = ocfs2_check_range_for_refcount(inode, saved_pos, count);
1833 if (ret == 1) {
1834 ocfs2_inode_unlock(inode, meta_level);
1835 meta_level = -1;
1836
1837 ret = ocfs2_prepare_inode_for_refcount(inode,
1838 saved_pos,
1839 count,
1840 &meta_level);
1841 if (has_refcount)
1842 *has_refcount = 1;
1843 if (direct_io)
1844 *direct_io = 0;
1845 }
1846
1847 if (ret < 0) {
1848 mlog_errno(ret);
1849 goto out_unlock;
1850 }
1851
1852 /*
1853 * Skip the O_DIRECT checks if we don't need
1854 * them.
1855 */
1856 if (!direct_io || !(*direct_io))
1857 break;
1858
1859 /*
1860 * There's no sane way to do direct writes to an inode
1861 * with inline data.
1862 */
1863 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1864 *direct_io = 0;
1865 break;
1866 }
1867
1868 /*
1869 * Allowing concurrent direct writes means
1870 * i_size changes wouldn't be synchronized, so
1871 * one node could wind up truncating another
1872 * nodes writes.
1873 */
1874 if (end > i_size_read(inode)) {
1875 *direct_io = 0;
1876 break;
1877 }
1878
1879 /*
1880 * We don't fill holes during direct io, so
1881 * check for them here. If any are found, the
1882 * caller will have to retake some cluster
1883 * locks and initiate the io as buffered.
1884 */
1885 ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
1886 if (ret == 1) {
1887 *direct_io = 0;
1888 ret = 0;
1889 } else if (ret < 0)
1890 mlog_errno(ret);
1891 break;
1892 }
1893
1894 if (appending)
1895 *ppos = saved_pos;
1896
1897 out_unlock:
1898 if (meta_level >= 0)
1899 ocfs2_inode_unlock(inode, meta_level);
1900
1901 out:
1902 return ret;
1903 }
1904
1905 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
1906 const struct iovec *iov,
1907 unsigned long nr_segs,
1908 loff_t pos)
1909 {
1910 int ret, direct_io, appending, rw_level, have_alloc_sem = 0;
1911 int can_do_direct, has_refcount = 0;
1912 ssize_t written = 0;
1913 size_t ocount; /* original count */
1914 size_t count; /* after file limit checks */
1915 loff_t old_size, *ppos = &iocb->ki_pos;
1916 u32 old_clusters;
1917 struct file *file = iocb->ki_filp;
1918 struct inode *inode = file->f_path.dentry->d_inode;
1919 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1920
1921 mlog_entry("(0x%p, %u, '%.*s')\n", file,
1922 (unsigned int)nr_segs,
1923 file->f_path.dentry->d_name.len,
1924 file->f_path.dentry->d_name.name);
1925
1926 if (iocb->ki_left == 0)
1927 return 0;
1928
1929 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
1930
1931 appending = file->f_flags & O_APPEND ? 1 : 0;
1932 direct_io = file->f_flags & O_DIRECT ? 1 : 0;
1933
1934 mutex_lock(&inode->i_mutex);
1935
1936 relock:
1937 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
1938 if (direct_io) {
1939 down_read(&inode->i_alloc_sem);
1940 have_alloc_sem = 1;
1941 }
1942
1943 /* concurrent O_DIRECT writes are allowed */
1944 rw_level = !direct_io;
1945 ret = ocfs2_rw_lock(inode, rw_level);
1946 if (ret < 0) {
1947 mlog_errno(ret);
1948 goto out_sems;
1949 }
1950
1951 can_do_direct = direct_io;
1952 ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos,
1953 iocb->ki_left, appending,
1954 &can_do_direct, &has_refcount);
1955 if (ret < 0) {
1956 mlog_errno(ret);
1957 goto out;
1958 }
1959
1960 /*
1961 * We can't complete the direct I/O as requested, fall back to
1962 * buffered I/O.
1963 */
1964 if (direct_io && !can_do_direct) {
1965 ocfs2_rw_unlock(inode, rw_level);
1966 up_read(&inode->i_alloc_sem);
1967
1968 have_alloc_sem = 0;
1969 rw_level = -1;
1970
1971 direct_io = 0;
1972 goto relock;
1973 }
1974
1975 /*
1976 * To later detect whether a journal commit for sync writes is
1977 * necessary, we sample i_size, and cluster count here.
1978 */
1979 old_size = i_size_read(inode);
1980 old_clusters = OCFS2_I(inode)->ip_clusters;
1981
1982 /* communicate with ocfs2_dio_end_io */
1983 ocfs2_iocb_set_rw_locked(iocb, rw_level);
1984
1985 ret = generic_segment_checks(iov, &nr_segs, &ocount,
1986 VERIFY_READ);
1987 if (ret)
1988 goto out_dio;
1989
1990 count = ocount;
1991 ret = generic_write_checks(file, ppos, &count,
1992 S_ISBLK(inode->i_mode));
1993 if (ret)
1994 goto out_dio;
1995
1996 if (direct_io) {
1997 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
1998 ppos, count, ocount);
1999 if (written < 0) {
2000 /*
2001 * direct write may have instantiated a few
2002 * blocks outside i_size. Trim these off again.
2003 * Don't need i_size_read because we hold i_mutex.
2004 */
2005 if (*ppos + count > inode->i_size)
2006 vmtruncate(inode, inode->i_size);
2007 ret = written;
2008 goto out_dio;
2009 }
2010 } else {
2011 current->backing_dev_info = file->f_mapping->backing_dev_info;
2012 written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos,
2013 ppos, count, 0);
2014 current->backing_dev_info = NULL;
2015 }
2016
2017 out_dio:
2018 /* buffered aio wouldn't have proper lock coverage today */
2019 BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2020
2021 if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
2022 ((file->f_flags & O_DIRECT) && has_refcount)) {
2023 ret = filemap_fdatawrite_range(file->f_mapping, pos,
2024 pos + count - 1);
2025 if (ret < 0)
2026 written = ret;
2027
2028 if (!ret && ((old_size != i_size_read(inode)) ||
2029 (old_clusters != OCFS2_I(inode)->ip_clusters) ||
2030 has_refcount)) {
2031 ret = jbd2_journal_force_commit(osb->journal->j_journal);
2032 if (ret < 0)
2033 written = ret;
2034 }
2035
2036 if (!ret)
2037 ret = filemap_fdatawait_range(file->f_mapping, pos,
2038 pos + count - 1);
2039 }
2040
2041 /*
2042 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2043 * function pointer which is called when o_direct io completes so that
2044 * it can unlock our rw lock. (it's the clustered equivalent of
2045 * i_alloc_sem; protects truncate from racing with pending ios).
2046 * Unfortunately there are error cases which call end_io and others
2047 * that don't. so we don't have to unlock the rw_lock if either an
2048 * async dio is going to do it in the future or an end_io after an
2049 * error has already done it.
2050 */
2051 if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2052 rw_level = -1;
2053 have_alloc_sem = 0;
2054 }
2055
2056 out:
2057 if (rw_level != -1)
2058 ocfs2_rw_unlock(inode, rw_level);
2059
2060 out_sems:
2061 if (have_alloc_sem)
2062 up_read(&inode->i_alloc_sem);
2063
2064 mutex_unlock(&inode->i_mutex);
2065
2066 if (written)
2067 ret = written;
2068 mlog_exit(ret);
2069 return ret;
2070 }
2071
2072 static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
2073 struct file *out,
2074 struct splice_desc *sd)
2075 {
2076 int ret;
2077
2078 ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, &sd->pos,
2079 sd->total_len, 0, NULL, NULL);
2080 if (ret < 0) {
2081 mlog_errno(ret);
2082 return ret;
2083 }
2084
2085 return splice_from_pipe_feed(pipe, sd, pipe_to_file);
2086 }
2087
2088 static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2089 struct file *out,
2090 loff_t *ppos,
2091 size_t len,
2092 unsigned int flags)
2093 {
2094 int ret;
2095 struct address_space *mapping = out->f_mapping;
2096 struct inode *inode = mapping->host;
2097 struct splice_desc sd = {
2098 .total_len = len,
2099 .flags = flags,
2100 .pos = *ppos,
2101 .u.file = out,
2102 };
2103
2104 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
2105 (unsigned int)len,
2106 out->f_path.dentry->d_name.len,
2107 out->f_path.dentry->d_name.name);
2108
2109 if (pipe->inode)
2110 mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT);
2111
2112 splice_from_pipe_begin(&sd);
2113 do {
2114 ret = splice_from_pipe_next(pipe, &sd);
2115 if (ret <= 0)
2116 break;
2117
2118 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2119 ret = ocfs2_rw_lock(inode, 1);
2120 if (ret < 0)
2121 mlog_errno(ret);
2122 else {
2123 ret = ocfs2_splice_to_file(pipe, out, &sd);
2124 ocfs2_rw_unlock(inode, 1);
2125 }
2126 mutex_unlock(&inode->i_mutex);
2127 } while (ret > 0);
2128 splice_from_pipe_end(pipe, &sd);
2129
2130 if (pipe->inode)
2131 mutex_unlock(&pipe->inode->i_mutex);
2132
2133 if (sd.num_spliced)
2134 ret = sd.num_spliced;
2135
2136 if (ret > 0) {
2137 unsigned long nr_pages;
2138 int err;
2139
2140 nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
2141
2142 err = generic_write_sync(out, *ppos, ret);
2143 if (err)
2144 ret = err;
2145 else
2146 *ppos += ret;
2147
2148 balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
2149 }
2150
2151 mlog_exit(ret);
2152 return ret;
2153 }
2154
2155 static ssize_t ocfs2_file_splice_read(struct file *in,
2156 loff_t *ppos,
2157 struct pipe_inode_info *pipe,
2158 size_t len,
2159 unsigned int flags)
2160 {
2161 int ret = 0, lock_level = 0;
2162 struct inode *inode = in->f_path.dentry->d_inode;
2163
2164 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
2165 (unsigned int)len,
2166 in->f_path.dentry->d_name.len,
2167 in->f_path.dentry->d_name.name);
2168
2169 /*
2170 * See the comment in ocfs2_file_aio_read()
2171 */
2172 ret = ocfs2_inode_lock_atime(inode, in->f_vfsmnt, &lock_level);
2173 if (ret < 0) {
2174 mlog_errno(ret);
2175 goto bail;
2176 }
2177 ocfs2_inode_unlock(inode, lock_level);
2178
2179 ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2180
2181 bail:
2182 mlog_exit(ret);
2183 return ret;
2184 }
2185
2186 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2187 const struct iovec *iov,
2188 unsigned long nr_segs,
2189 loff_t pos)
2190 {
2191 int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2192 struct file *filp = iocb->ki_filp;
2193 struct inode *inode = filp->f_path.dentry->d_inode;
2194
2195 mlog_entry("(0x%p, %u, '%.*s')\n", filp,
2196 (unsigned int)nr_segs,
2197 filp->f_path.dentry->d_name.len,
2198 filp->f_path.dentry->d_name.name);
2199
2200 if (!inode) {
2201 ret = -EINVAL;
2202 mlog_errno(ret);
2203 goto bail;
2204 }
2205
2206 /*
2207 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
2208 * need locks to protect pending reads from racing with truncate.
2209 */
2210 if (filp->f_flags & O_DIRECT) {
2211 down_read(&inode->i_alloc_sem);
2212 have_alloc_sem = 1;
2213
2214 ret = ocfs2_rw_lock(inode, 0);
2215 if (ret < 0) {
2216 mlog_errno(ret);
2217 goto bail;
2218 }
2219 rw_level = 0;
2220 /* communicate with ocfs2_dio_end_io */
2221 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2222 }
2223
2224 /*
2225 * We're fine letting folks race truncates and extending
2226 * writes with read across the cluster, just like they can
2227 * locally. Hence no rw_lock during read.
2228 *
2229 * Take and drop the meta data lock to update inode fields
2230 * like i_size. This allows the checks down below
2231 * generic_file_aio_read() a chance of actually working.
2232 */
2233 ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2234 if (ret < 0) {
2235 mlog_errno(ret);
2236 goto bail;
2237 }
2238 ocfs2_inode_unlock(inode, lock_level);
2239
2240 ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2241 if (ret == -EINVAL)
2242 mlog(0, "generic_file_aio_read returned -EINVAL\n");
2243
2244 /* buffered aio wouldn't have proper lock coverage today */
2245 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2246
2247 /* see ocfs2_file_aio_write */
2248 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2249 rw_level = -1;
2250 have_alloc_sem = 0;
2251 }
2252
2253 bail:
2254 if (have_alloc_sem)
2255 up_read(&inode->i_alloc_sem);
2256 if (rw_level != -1)
2257 ocfs2_rw_unlock(inode, rw_level);
2258 mlog_exit(ret);
2259
2260 return ret;
2261 }
2262
2263 const struct inode_operations ocfs2_file_iops = {
2264 .setattr = ocfs2_setattr,
2265 .getattr = ocfs2_getattr,
2266 .permission = ocfs2_permission,
2267 .setxattr = generic_setxattr,
2268 .getxattr = generic_getxattr,
2269 .listxattr = ocfs2_listxattr,
2270 .removexattr = generic_removexattr,
2271 .fallocate = ocfs2_fallocate,
2272 .fiemap = ocfs2_fiemap,
2273 };
2274
2275 const struct inode_operations ocfs2_special_file_iops = {
2276 .setattr = ocfs2_setattr,
2277 .getattr = ocfs2_getattr,
2278 .permission = ocfs2_permission,
2279 };
2280
2281 /*
2282 * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2283 * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2284 */
2285 const struct file_operations ocfs2_fops = {
2286 .llseek = generic_file_llseek,
2287 .read = do_sync_read,
2288 .write = do_sync_write,
2289 .mmap = ocfs2_mmap,
2290 .fsync = ocfs2_sync_file,
2291 .release = ocfs2_file_release,
2292 .open = ocfs2_file_open,
2293 .aio_read = ocfs2_file_aio_read,
2294 .aio_write = ocfs2_file_aio_write,
2295 .unlocked_ioctl = ocfs2_ioctl,
2296 #ifdef CONFIG_COMPAT
2297 .compat_ioctl = ocfs2_compat_ioctl,
2298 #endif
2299 .lock = ocfs2_lock,
2300 .flock = ocfs2_flock,
2301 .splice_read = ocfs2_file_splice_read,
2302 .splice_write = ocfs2_file_splice_write,
2303 };
2304
2305 const struct file_operations ocfs2_dops = {
2306 .llseek = generic_file_llseek,
2307 .read = generic_read_dir,
2308 .readdir = ocfs2_readdir,
2309 .fsync = ocfs2_sync_file,
2310 .release = ocfs2_dir_release,
2311 .open = ocfs2_dir_open,
2312 .unlocked_ioctl = ocfs2_ioctl,
2313 #ifdef CONFIG_COMPAT
2314 .compat_ioctl = ocfs2_compat_ioctl,
2315 #endif
2316 .lock = ocfs2_lock,
2317 .flock = ocfs2_flock,
2318 };
2319
2320 /*
2321 * POSIX-lockless variants of our file_operations.
2322 *
2323 * These will be used if the underlying cluster stack does not support
2324 * posix file locking, if the user passes the "localflocks" mount
2325 * option, or if we have a local-only fs.
2326 *
2327 * ocfs2_flock is in here because all stacks handle UNIX file locks,
2328 * so we still want it in the case of no stack support for
2329 * plocks. Internally, it will do the right thing when asked to ignore
2330 * the cluster.
2331 */
2332 const struct file_operations ocfs2_fops_no_plocks = {
2333 .llseek = generic_file_llseek,
2334 .read = do_sync_read,
2335 .write = do_sync_write,
2336 .mmap = ocfs2_mmap,
2337 .fsync = ocfs2_sync_file,
2338 .release = ocfs2_file_release,
2339 .open = ocfs2_file_open,
2340 .aio_read = ocfs2_file_aio_read,
2341 .aio_write = ocfs2_file_aio_write,
2342 .unlocked_ioctl = ocfs2_ioctl,
2343 #ifdef CONFIG_COMPAT
2344 .compat_ioctl = ocfs2_compat_ioctl,
2345 #endif
2346 .flock = ocfs2_flock,
2347 .splice_read = ocfs2_file_splice_read,
2348 .splice_write = ocfs2_file_splice_write,
2349 };
2350
2351 const struct file_operations ocfs2_dops_no_plocks = {
2352 .llseek = generic_file_llseek,
2353 .read = generic_read_dir,
2354 .readdir = ocfs2_readdir,
2355 .fsync = ocfs2_sync_file,
2356 .release = ocfs2_dir_release,
2357 .open = ocfs2_dir_open,
2358 .unlocked_ioctl = ocfs2_ioctl,
2359 #ifdef CONFIG_COMPAT
2360 .compat_ioctl = ocfs2_compat_ioctl,
2361 #endif
2362 .flock = ocfs2_flock,
2363 };
Linux kernel - Deliverables
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