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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 } else {
688 BUG_ON(why != RESTART_TRANS);
689
690 mlog(0, "restarting transaction.\n");
691 /* TODO: This can be more intelligent. */
692 credits = ocfs2_calc_extend_credits(osb->sb,
693 &fe->id2.i_list,
694 clusters_to_add);
695 status = ocfs2_extend_trans(handle, credits);
696 if (status < 0) {
697 /* handle still has to be committed at
698 * this point. */
699 status = -ENOMEM;
700 mlog_errno(status);
701 goto leave;
702 }
703 goto restarted_transaction;
704 }
705 }
706
707 mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
708 le32_to_cpu(fe->i_clusters),
709 (unsigned long long)le64_to_cpu(fe->i_size));
710 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
711 OCFS2_I(inode)->ip_clusters, (long long)i_size_read(inode));
712
713 leave:
714 if (status < 0 && did_quota)
715 dquot_free_space(inode,
716 ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
717 if (handle) {
718 ocfs2_commit_trans(osb, handle);
719 handle = NULL;
720 }
721 if (data_ac) {
722 ocfs2_free_alloc_context(data_ac);
723 data_ac = NULL;
724 }
725 if (meta_ac) {
726 ocfs2_free_alloc_context(meta_ac);
727 meta_ac = NULL;
728 }
729 if ((!status) && restart_func) {
730 restart_func = 0;
731 goto restart_all;
732 }
733 brelse(bh);
734 bh = NULL;
735
736 mlog_exit(status);
737 return status;
738 }
739
740 /* Some parts of this taken from generic_cont_expand, which turned out
741 * to be too fragile to do exactly what we need without us having to
742 * worry about recursive locking in ->write_begin() and ->write_end(). */
743 static int ocfs2_write_zero_page(struct inode *inode,
744 u64 size)
745 {
746 struct address_space *mapping = inode->i_mapping;
747 struct page *page;
748 unsigned long index;
749 unsigned int offset;
750 handle_t *handle = NULL;
751 int ret;
752
753 offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
754 /* ugh. in prepare/commit_write, if from==to==start of block, we
755 ** skip the prepare. make sure we never send an offset for the start
756 ** of a block
757 */
758 if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
759 offset++;
760 }
761 index = size >> PAGE_CACHE_SHIFT;
762
763 page = grab_cache_page(mapping, index);
764 if (!page) {
765 ret = -ENOMEM;
766 mlog_errno(ret);
767 goto out;
768 }
769
770 ret = ocfs2_prepare_write_nolock(inode, page, offset, offset);
771 if (ret < 0) {
772 mlog_errno(ret);
773 goto out_unlock;
774 }
775
776 if (ocfs2_should_order_data(inode)) {
777 handle = ocfs2_start_walk_page_trans(inode, page, offset,
778 offset);
779 if (IS_ERR(handle)) {
780 ret = PTR_ERR(handle);
781 handle = NULL;
782 goto out_unlock;
783 }
784 }
785
786 /* must not update i_size! */
787 ret = block_commit_write(page, offset, offset);
788 if (ret < 0)
789 mlog_errno(ret);
790 else
791 ret = 0;
792
793 if (handle)
794 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
795 out_unlock:
796 unlock_page(page);
797 page_cache_release(page);
798 out:
799 return ret;
800 }
801
802 static int ocfs2_zero_extend(struct inode *inode,
803 u64 zero_to_size)
804 {
805 int ret = 0;
806 u64 start_off;
807 struct super_block *sb = inode->i_sb;
808
809 start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
810 while (start_off < zero_to_size) {
811 ret = ocfs2_write_zero_page(inode, start_off);
812 if (ret < 0) {
813 mlog_errno(ret);
814 goto out;
815 }
816
817 start_off += sb->s_blocksize;
818
819 /*
820 * Very large extends have the potential to lock up
821 * the cpu for extended periods of time.
822 */
823 cond_resched();
824 }
825
826 out:
827 return ret;
828 }
829
830 int ocfs2_extend_no_holes(struct inode *inode, u64 new_i_size, u64 zero_to)
831 {
832 int ret;
833 u32 clusters_to_add;
834 struct ocfs2_inode_info *oi = OCFS2_I(inode);
835
836 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
837 if (clusters_to_add < oi->ip_clusters)
838 clusters_to_add = 0;
839 else
840 clusters_to_add -= oi->ip_clusters;
841
842 if (clusters_to_add) {
843 ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
844 clusters_to_add, 0);
845 if (ret) {
846 mlog_errno(ret);
847 goto out;
848 }
849 }
850
851 /*
852 * Call this even if we don't add any clusters to the tree. We
853 * still need to zero the area between the old i_size and the
854 * new i_size.
855 */
856 ret = ocfs2_zero_extend(inode, zero_to);
857 if (ret < 0)
858 mlog_errno(ret);
859
860 out:
861 return ret;
862 }
863
864 static int ocfs2_extend_file(struct inode *inode,
865 struct buffer_head *di_bh,
866 u64 new_i_size)
867 {
868 int ret = 0;
869 struct ocfs2_inode_info *oi = OCFS2_I(inode);
870
871 BUG_ON(!di_bh);
872
873 /* setattr sometimes calls us like this. */
874 if (new_i_size == 0)
875 goto out;
876
877 if (i_size_read(inode) == new_i_size)
878 goto out;
879 BUG_ON(new_i_size < i_size_read(inode));
880
881 /*
882 * Fall through for converting inline data, even if the fs
883 * supports sparse files.
884 *
885 * The check for inline data here is legal - nobody can add
886 * the feature since we have i_mutex. We must check it again
887 * after acquiring ip_alloc_sem though, as paths like mmap
888 * might have raced us to converting the inode to extents.
889 */
890 if (!(oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
891 && ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
892 goto out_update_size;
893
894 /*
895 * The alloc sem blocks people in read/write from reading our
896 * allocation until we're done changing it. We depend on
897 * i_mutex to block other extend/truncate calls while we're
898 * here.
899 */
900 down_write(&oi->ip_alloc_sem);
901
902 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
903 /*
904 * We can optimize small extends by keeping the inodes
905 * inline data.
906 */
907 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
908 up_write(&oi->ip_alloc_sem);
909 goto out_update_size;
910 }
911
912 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
913 if (ret) {
914 up_write(&oi->ip_alloc_sem);
915
916 mlog_errno(ret);
917 goto out;
918 }
919 }
920
921 if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
922 ret = ocfs2_extend_no_holes(inode, new_i_size, new_i_size);
923
924 up_write(&oi->ip_alloc_sem);
925
926 if (ret < 0) {
927 mlog_errno(ret);
928 goto out;
929 }
930
931 out_update_size:
932 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
933 if (ret < 0)
934 mlog_errno(ret);
935
936 out:
937 return ret;
938 }
939
940 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
941 {
942 int status = 0, size_change;
943 struct inode *inode = dentry->d_inode;
944 struct super_block *sb = inode->i_sb;
945 struct ocfs2_super *osb = OCFS2_SB(sb);
946 struct buffer_head *bh = NULL;
947 handle_t *handle = NULL;
948 int qtype;
949 struct dquot *transfer_from[MAXQUOTAS] = { };
950 struct dquot *transfer_to[MAXQUOTAS] = { };
951
952 mlog_entry("(0x%p, '%.*s')\n", dentry,
953 dentry->d_name.len, dentry->d_name.name);
954
955 /* ensuring we don't even attempt to truncate a symlink */
956 if (S_ISLNK(inode->i_mode))
957 attr->ia_valid &= ~ATTR_SIZE;
958
959 if (attr->ia_valid & ATTR_MODE)
960 mlog(0, "mode change: %d\n", attr->ia_mode);
961 if (attr->ia_valid & ATTR_UID)
962 mlog(0, "uid change: %d\n", attr->ia_uid);
963 if (attr->ia_valid & ATTR_GID)
964 mlog(0, "gid change: %d\n", attr->ia_gid);
965 if (attr->ia_valid & ATTR_SIZE)
966 mlog(0, "size change...\n");
967 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
968 mlog(0, "time change...\n");
969
970 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
971 | ATTR_GID | ATTR_UID | ATTR_MODE)
972 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
973 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
974 return 0;
975 }
976
977 status = inode_change_ok(inode, attr);
978 if (status)
979 return status;
980
981 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
982 if (size_change) {
983 dquot_initialize(inode);
984
985 status = ocfs2_rw_lock(inode, 1);
986 if (status < 0) {
987 mlog_errno(status);
988 goto bail;
989 }
990 }
991
992 status = ocfs2_inode_lock(inode, &bh, 1);
993 if (status < 0) {
994 if (status != -ENOENT)
995 mlog_errno(status);
996 goto bail_unlock_rw;
997 }
998
999 if (size_change && attr->ia_size != i_size_read(inode)) {
1000 status = inode_newsize_ok(inode, attr->ia_size);
1001 if (status)
1002 goto bail_unlock;
1003
1004 if (i_size_read(inode) > attr->ia_size) {
1005 if (ocfs2_should_order_data(inode)) {
1006 status = ocfs2_begin_ordered_truncate(inode,
1007 attr->ia_size);
1008 if (status)
1009 goto bail_unlock;
1010 }
1011 status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1012 } else
1013 status = ocfs2_extend_file(inode, bh, attr->ia_size);
1014 if (status < 0) {
1015 if (status != -ENOSPC)
1016 mlog_errno(status);
1017 status = -ENOSPC;
1018 goto bail_unlock;
1019 }
1020 }
1021
1022 if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
1023 (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
1024 /*
1025 * Gather pointers to quota structures so that allocation /
1026 * freeing of quota structures happens here and not inside
1027 * dquot_transfer() where we have problems with lock ordering
1028 */
1029 if (attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid
1030 && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1031 OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1032 transfer_to[USRQUOTA] = dqget(sb, attr->ia_uid,
1033 USRQUOTA);
1034 transfer_from[USRQUOTA] = dqget(sb, inode->i_uid,
1035 USRQUOTA);
1036 if (!transfer_to[USRQUOTA] || !transfer_from[USRQUOTA]) {
1037 status = -ESRCH;
1038 goto bail_unlock;
1039 }
1040 }
1041 if (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid
1042 && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1043 OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1044 transfer_to[GRPQUOTA] = dqget(sb, attr->ia_gid,
1045 GRPQUOTA);
1046 transfer_from[GRPQUOTA] = dqget(sb, inode->i_gid,
1047 GRPQUOTA);
1048 if (!transfer_to[GRPQUOTA] || !transfer_from[GRPQUOTA]) {
1049 status = -ESRCH;
1050 goto bail_unlock;
1051 }
1052 }
1053 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1054 2 * ocfs2_quota_trans_credits(sb));
1055 if (IS_ERR(handle)) {
1056 status = PTR_ERR(handle);
1057 mlog_errno(status);
1058 goto bail_unlock;
1059 }
1060 status = dquot_transfer(inode, attr);
1061 if (status < 0)
1062 goto bail_commit;
1063 } else {
1064 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1065 if (IS_ERR(handle)) {
1066 status = PTR_ERR(handle);
1067 mlog_errno(status);
1068 goto bail_unlock;
1069 }
1070 }
1071
1072 /*
1073 * This will intentionally not wind up calling vmtruncate(),
1074 * since all the work for a size change has been done above.
1075 * Otherwise, we could get into problems with truncate as
1076 * ip_alloc_sem is used there to protect against i_size
1077 * changes.
1078 */
1079 status = inode_setattr(inode, attr);
1080 if (status < 0) {
1081 mlog_errno(status);
1082 goto bail_commit;
1083 }
1084
1085 status = ocfs2_mark_inode_dirty(handle, inode, bh);
1086 if (status < 0)
1087 mlog_errno(status);
1088
1089 bail_commit:
1090 ocfs2_commit_trans(osb, handle);
1091 bail_unlock:
1092 ocfs2_inode_unlock(inode, 1);
1093 bail_unlock_rw:
1094 if (size_change)
1095 ocfs2_rw_unlock(inode, 1);
1096 bail:
1097 brelse(bh);
1098
1099 /* Release quota pointers in case we acquired them */
1100 for (qtype = 0; qtype < MAXQUOTAS; qtype++) {
1101 dqput(transfer_to[qtype]);
1102 dqput(transfer_from[qtype]);
1103 }
1104
1105 if (!status && attr->ia_valid & ATTR_MODE) {
1106 status = ocfs2_acl_chmod(inode);
1107 if (status < 0)
1108 mlog_errno(status);
1109 }
1110
1111 mlog_exit(status);
1112 return status;
1113 }
1114
1115 int ocfs2_getattr(struct vfsmount *mnt,
1116 struct dentry *dentry,
1117 struct kstat *stat)
1118 {
1119 struct inode *inode = dentry->d_inode;
1120 struct super_block *sb = dentry->d_inode->i_sb;
1121 struct ocfs2_super *osb = sb->s_fs_info;
1122 int err;
1123
1124 mlog_entry_void();
1125
1126 err = ocfs2_inode_revalidate(dentry);
1127 if (err) {
1128 if (err != -ENOENT)
1129 mlog_errno(err);
1130 goto bail;
1131 }
1132
1133 generic_fillattr(inode, stat);
1134
1135 /* We set the blksize from the cluster size for performance */
1136 stat->blksize = osb->s_clustersize;
1137
1138 bail:
1139 mlog_exit(err);
1140
1141 return err;
1142 }
1143
1144 int ocfs2_permission(struct inode *inode, int mask)
1145 {
1146 int ret;
1147
1148 mlog_entry_void();
1149
1150 ret = ocfs2_inode_lock(inode, NULL, 0);
1151 if (ret) {
1152 if (ret != -ENOENT)
1153 mlog_errno(ret);
1154 goto out;
1155 }
1156
1157 ret = generic_permission(inode, mask, ocfs2_check_acl);
1158
1159 ocfs2_inode_unlock(inode, 0);
1160 out:
1161 mlog_exit(ret);
1162 return ret;
1163 }
1164
1165 static int __ocfs2_write_remove_suid(struct inode *inode,
1166 struct buffer_head *bh)
1167 {
1168 int ret;
1169 handle_t *handle;
1170 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1171 struct ocfs2_dinode *di;
1172
1173 mlog_entry("(Inode %llu, mode 0%o)\n",
1174 (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
1175
1176 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1177 if (IS_ERR(handle)) {
1178 ret = PTR_ERR(handle);
1179 mlog_errno(ret);
1180 goto out;
1181 }
1182
1183 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1184 OCFS2_JOURNAL_ACCESS_WRITE);
1185 if (ret < 0) {
1186 mlog_errno(ret);
1187 goto out_trans;
1188 }
1189
1190 inode->i_mode &= ~S_ISUID;
1191 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1192 inode->i_mode &= ~S_ISGID;
1193
1194 di = (struct ocfs2_dinode *) bh->b_data;
1195 di->i_mode = cpu_to_le16(inode->i_mode);
1196
1197 ret = ocfs2_journal_dirty(handle, bh);
1198 if (ret < 0)
1199 mlog_errno(ret);
1200
1201 out_trans:
1202 ocfs2_commit_trans(osb, handle);
1203 out:
1204 mlog_exit(ret);
1205 return ret;
1206 }
1207
1208 /*
1209 * Will look for holes and unwritten extents in the range starting at
1210 * pos for count bytes (inclusive).
1211 */
1212 static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1213 size_t count)
1214 {
1215 int ret = 0;
1216 unsigned int extent_flags;
1217 u32 cpos, clusters, extent_len, phys_cpos;
1218 struct super_block *sb = inode->i_sb;
1219
1220 cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1221 clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1222
1223 while (clusters) {
1224 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1225 &extent_flags);
1226 if (ret < 0) {
1227 mlog_errno(ret);
1228 goto out;
1229 }
1230
1231 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
1232 ret = 1;
1233 break;
1234 }
1235
1236 if (extent_len > clusters)
1237 extent_len = clusters;
1238
1239 clusters -= extent_len;
1240 cpos += extent_len;
1241 }
1242 out:
1243 return ret;
1244 }
1245
1246 static int ocfs2_write_remove_suid(struct inode *inode)
1247 {
1248 int ret;
1249 struct buffer_head *bh = NULL;
1250
1251 ret = ocfs2_read_inode_block(inode, &bh);
1252 if (ret < 0) {
1253 mlog_errno(ret);
1254 goto out;
1255 }
1256
1257 ret = __ocfs2_write_remove_suid(inode, bh);
1258 out:
1259 brelse(bh);
1260 return ret;
1261 }
1262
1263 /*
1264 * Allocate enough extents to cover the region starting at byte offset
1265 * start for len bytes. Existing extents are skipped, any extents
1266 * added are marked as "unwritten".
1267 */
1268 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1269 u64 start, u64 len)
1270 {
1271 int ret;
1272 u32 cpos, phys_cpos, clusters, alloc_size;
1273 u64 end = start + len;
1274 struct buffer_head *di_bh = NULL;
1275
1276 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1277 ret = ocfs2_read_inode_block(inode, &di_bh);
1278 if (ret) {
1279 mlog_errno(ret);
1280 goto out;
1281 }
1282
1283 /*
1284 * Nothing to do if the requested reservation range
1285 * fits within the inode.
1286 */
1287 if (ocfs2_size_fits_inline_data(di_bh, end))
1288 goto out;
1289
1290 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1291 if (ret) {
1292 mlog_errno(ret);
1293 goto out;
1294 }
1295 }
1296
1297 /*
1298 * We consider both start and len to be inclusive.
1299 */
1300 cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1301 clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1302 clusters -= cpos;
1303
1304 while (clusters) {
1305 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1306 &alloc_size, NULL);
1307 if (ret) {
1308 mlog_errno(ret);
1309 goto out;
1310 }
1311
1312 /*
1313 * Hole or existing extent len can be arbitrary, so
1314 * cap it to our own allocation request.
1315 */
1316 if (alloc_size > clusters)
1317 alloc_size = clusters;
1318
1319 if (phys_cpos) {
1320 /*
1321 * We already have an allocation at this
1322 * region so we can safely skip it.
1323 */
1324 goto next;
1325 }
1326
1327 ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1328 if (ret) {
1329 if (ret != -ENOSPC)
1330 mlog_errno(ret);
1331 goto out;
1332 }
1333
1334 next:
1335 cpos += alloc_size;
1336 clusters -= alloc_size;
1337 }
1338
1339 ret = 0;
1340 out:
1341
1342 brelse(di_bh);
1343 return ret;
1344 }
1345
1346 /*
1347 * Truncate a byte range, avoiding pages within partial clusters. This
1348 * preserves those pages for the zeroing code to write to.
1349 */
1350 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1351 u64 byte_len)
1352 {
1353 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1354 loff_t start, end;
1355 struct address_space *mapping = inode->i_mapping;
1356
1357 start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1358 end = byte_start + byte_len;
1359 end = end & ~(osb->s_clustersize - 1);
1360
1361 if (start < end) {
1362 unmap_mapping_range(mapping, start, end - start, 0);
1363 truncate_inode_pages_range(mapping, start, end - 1);
1364 }
1365 }
1366
1367 static int ocfs2_zero_partial_clusters(struct inode *inode,
1368 u64 start, u64 len)
1369 {
1370 int ret = 0;
1371 u64 tmpend, end = start + len;
1372 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1373 unsigned int csize = osb->s_clustersize;
1374 handle_t *handle;
1375
1376 /*
1377 * The "start" and "end" values are NOT necessarily part of
1378 * the range whose allocation is being deleted. Rather, this
1379 * is what the user passed in with the request. We must zero
1380 * partial clusters here. There's no need to worry about
1381 * physical allocation - the zeroing code knows to skip holes.
1382 */
1383 mlog(0, "byte start: %llu, end: %llu\n",
1384 (unsigned long long)start, (unsigned long long)end);
1385
1386 /*
1387 * If both edges are on a cluster boundary then there's no
1388 * zeroing required as the region is part of the allocation to
1389 * be truncated.
1390 */
1391 if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1392 goto out;
1393
1394 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1395 if (IS_ERR(handle)) {
1396 ret = PTR_ERR(handle);
1397 mlog_errno(ret);
1398 goto out;
1399 }
1400
1401 /*
1402 * We want to get the byte offset of the end of the 1st cluster.
1403 */
1404 tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1405 if (tmpend > end)
1406 tmpend = end;
1407
1408 mlog(0, "1st range: start: %llu, tmpend: %llu\n",
1409 (unsigned long long)start, (unsigned long long)tmpend);
1410
1411 ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1412 if (ret)
1413 mlog_errno(ret);
1414
1415 if (tmpend < end) {
1416 /*
1417 * This may make start and end equal, but the zeroing
1418 * code will skip any work in that case so there's no
1419 * need to catch it up here.
1420 */
1421 start = end & ~(osb->s_clustersize - 1);
1422
1423 mlog(0, "2nd range: start: %llu, end: %llu\n",
1424 (unsigned long long)start, (unsigned long long)end);
1425
1426 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1427 if (ret)
1428 mlog_errno(ret);
1429 }
1430
1431 ocfs2_commit_trans(osb, handle);
1432 out:
1433 return ret;
1434 }
1435
1436 static int ocfs2_remove_inode_range(struct inode *inode,
1437 struct buffer_head *di_bh, u64 byte_start,
1438 u64 byte_len)
1439 {
1440 int ret = 0;
1441 u32 trunc_start, trunc_len, cpos, phys_cpos, alloc_size;
1442 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1443 struct ocfs2_cached_dealloc_ctxt dealloc;
1444 struct address_space *mapping = inode->i_mapping;
1445 struct ocfs2_extent_tree et;
1446
1447 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1448 ocfs2_init_dealloc_ctxt(&dealloc);
1449
1450 if (byte_len == 0)
1451 return 0;
1452
1453 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1454 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1455 byte_start + byte_len, 0);
1456 if (ret) {
1457 mlog_errno(ret);
1458 goto out;
1459 }
1460 /*
1461 * There's no need to get fancy with the page cache
1462 * truncate of an inline-data inode. We're talking
1463 * about less than a page here, which will be cached
1464 * in the dinode buffer anyway.
1465 */
1466 unmap_mapping_range(mapping, 0, 0, 0);
1467 truncate_inode_pages(mapping, 0);
1468 goto out;
1469 }
1470
1471 trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1472 trunc_len = (byte_start + byte_len) >> osb->s_clustersize_bits;
1473 if (trunc_len >= trunc_start)
1474 trunc_len -= trunc_start;
1475 else
1476 trunc_len = 0;
1477
1478 mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u\n",
1479 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1480 (unsigned long long)byte_start,
1481 (unsigned long long)byte_len, trunc_start, trunc_len);
1482
1483 ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1484 if (ret) {
1485 mlog_errno(ret);
1486 goto out;
1487 }
1488
1489 cpos = trunc_start;
1490 while (trunc_len) {
1491 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1492 &alloc_size, NULL);
1493 if (ret) {
1494 mlog_errno(ret);
1495 goto out;
1496 }
1497
1498 if (alloc_size > trunc_len)
1499 alloc_size = trunc_len;
1500
1501 /* Only do work for non-holes */
1502 if (phys_cpos != 0) {
1503 ret = ocfs2_remove_btree_range(inode, &et, cpos,
1504 phys_cpos, alloc_size,
1505 &dealloc);
1506 if (ret) {
1507 mlog_errno(ret);
1508 goto out;
1509 }
1510 }
1511
1512 cpos += alloc_size;
1513 trunc_len -= alloc_size;
1514 }
1515
1516 ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1517
1518 out:
1519 ocfs2_schedule_truncate_log_flush(osb, 1);
1520 ocfs2_run_deallocs(osb, &dealloc);
1521
1522 return ret;
1523 }
1524
1525 /*
1526 * Parts of this function taken from xfs_change_file_space()
1527 */
1528 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1529 loff_t f_pos, unsigned int cmd,
1530 struct ocfs2_space_resv *sr,
1531 int change_size)
1532 {
1533 int ret;
1534 s64 llen;
1535 loff_t size;
1536 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1537 struct buffer_head *di_bh = NULL;
1538 handle_t *handle;
1539 unsigned long long max_off = inode->i_sb->s_maxbytes;
1540
1541 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1542 return -EROFS;
1543
1544 mutex_lock(&inode->i_mutex);
1545
1546 /*
1547 * This prevents concurrent writes on other nodes
1548 */
1549 ret = ocfs2_rw_lock(inode, 1);
1550 if (ret) {
1551 mlog_errno(ret);
1552 goto out;
1553 }
1554
1555 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1556 if (ret) {
1557 mlog_errno(ret);
1558 goto out_rw_unlock;
1559 }
1560
1561 if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1562 ret = -EPERM;
1563 goto out_inode_unlock;
1564 }
1565
1566 switch (sr->l_whence) {
1567 case 0: /*SEEK_SET*/
1568 break;
1569 case 1: /*SEEK_CUR*/
1570 sr->l_start += f_pos;
1571 break;
1572 case 2: /*SEEK_END*/
1573 sr->l_start += i_size_read(inode);
1574 break;
1575 default:
1576 ret = -EINVAL;
1577 goto out_inode_unlock;
1578 }
1579 sr->l_whence = 0;
1580
1581 llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1582
1583 if (sr->l_start < 0
1584 || sr->l_start > max_off
1585 || (sr->l_start + llen) < 0
1586 || (sr->l_start + llen) > max_off) {
1587 ret = -EINVAL;
1588 goto out_inode_unlock;
1589 }
1590 size = sr->l_start + sr->l_len;
1591
1592 if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
1593 if (sr->l_len <= 0) {
1594 ret = -EINVAL;
1595 goto out_inode_unlock;
1596 }
1597 }
1598
1599 if (file && should_remove_suid(file->f_path.dentry)) {
1600 ret = __ocfs2_write_remove_suid(inode, di_bh);
1601 if (ret) {
1602 mlog_errno(ret);
1603 goto out_inode_unlock;
1604 }
1605 }
1606
1607 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1608 switch (cmd) {
1609 case OCFS2_IOC_RESVSP:
1610 case OCFS2_IOC_RESVSP64:
1611 /*
1612 * This takes unsigned offsets, but the signed ones we
1613 * pass have been checked against overflow above.
1614 */
1615 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1616 sr->l_len);
1617 break;
1618 case OCFS2_IOC_UNRESVSP:
1619 case OCFS2_IOC_UNRESVSP64:
1620 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1621 sr->l_len);
1622 break;
1623 default:
1624 ret = -EINVAL;
1625 }
1626 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1627 if (ret) {
1628 mlog_errno(ret);
1629 goto out_inode_unlock;
1630 }
1631
1632 /*
1633 * We update c/mtime for these changes
1634 */
1635 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1636 if (IS_ERR(handle)) {
1637 ret = PTR_ERR(handle);
1638 mlog_errno(ret);
1639 goto out_inode_unlock;
1640 }
1641
1642 if (change_size && i_size_read(inode) < size)
1643 i_size_write(inode, size);
1644
1645 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1646 ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1647 if (ret < 0)
1648 mlog_errno(ret);
1649
1650 ocfs2_commit_trans(osb, handle);
1651
1652 out_inode_unlock:
1653 brelse(di_bh);
1654 ocfs2_inode_unlock(inode, 1);
1655 out_rw_unlock:
1656 ocfs2_rw_unlock(inode, 1);
1657
1658 out:
1659 mutex_unlock(&inode->i_mutex);
1660 return ret;
1661 }
1662
1663 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1664 struct ocfs2_space_resv *sr)
1665 {
1666 struct inode *inode = file->f_path.dentry->d_inode;
1667 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1668
1669 if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1670 !ocfs2_writes_unwritten_extents(osb))
1671 return -ENOTTY;
1672 else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1673 !ocfs2_sparse_alloc(osb))
1674 return -ENOTTY;
1675
1676 if (!S_ISREG(inode->i_mode))
1677 return -EINVAL;
1678
1679 if (!(file->f_mode & FMODE_WRITE))
1680 return -EBADF;
1681
1682 return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1683 }
1684
1685 static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset,
1686 loff_t len)
1687 {
1688 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1689 struct ocfs2_space_resv sr;
1690 int change_size = 1;
1691
1692 if (!ocfs2_writes_unwritten_extents(osb))
1693 return -EOPNOTSUPP;
1694
1695 if (S_ISDIR(inode->i_mode))
1696 return -ENODEV;
1697
1698 if (mode & FALLOC_FL_KEEP_SIZE)
1699 change_size = 0;
1700
1701 sr.l_whence = 0;
1702 sr.l_start = (s64)offset;
1703 sr.l_len = (s64)len;
1704
1705 return __ocfs2_change_file_space(NULL, inode, offset,
1706 OCFS2_IOC_RESVSP64, &sr, change_size);
1707 }
1708
1709 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
1710 size_t count)
1711 {
1712 int ret = 0;
1713 unsigned int extent_flags;
1714 u32 cpos, clusters, extent_len, phys_cpos;
1715 struct super_block *sb = inode->i_sb;
1716
1717 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
1718 !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
1719 OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
1720 return 0;
1721
1722 cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1723 clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1724
1725 while (clusters) {
1726 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1727 &extent_flags);
1728 if (ret < 0) {
1729 mlog_errno(ret);
1730 goto out;
1731 }
1732
1733 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
1734 ret = 1;
1735 break;
1736 }
1737
1738 if (extent_len > clusters)
1739 extent_len = clusters;
1740
1741 clusters -= extent_len;
1742 cpos += extent_len;
1743 }
1744 out:
1745 return ret;
1746 }
1747
1748 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
1749 loff_t pos, size_t count,
1750 int *meta_level)
1751 {
1752 int ret;
1753 struct buffer_head *di_bh = NULL;
1754 u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1755 u32 clusters =
1756 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
1757
1758 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1759 if (ret) {
1760 mlog_errno(ret);
1761 goto out;
1762 }
1763
1764 *meta_level = 1;
1765
1766 ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
1767 if (ret)
1768 mlog_errno(ret);
1769 out:
1770 brelse(di_bh);
1771 return ret;
1772 }
1773
1774 static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
1775 loff_t *ppos,
1776 size_t count,
1777 int appending,
1778 int *direct_io,
1779 int *has_refcount)
1780 {
1781 int ret = 0, meta_level = 0;
1782 struct inode *inode = dentry->d_inode;
1783 loff_t saved_pos, end;
1784
1785 /*
1786 * We start with a read level meta lock and only jump to an ex
1787 * if we need to make modifications here.
1788 */
1789 for(;;) {
1790 ret = ocfs2_inode_lock(inode, NULL, meta_level);
1791 if (ret < 0) {
1792 meta_level = -1;
1793 mlog_errno(ret);
1794 goto out;
1795 }
1796
1797 /* Clear suid / sgid if necessary. We do this here
1798 * instead of later in the write path because
1799 * remove_suid() calls ->setattr without any hint that
1800 * we may have already done our cluster locking. Since
1801 * ocfs2_setattr() *must* take cluster locks to
1802 * proceeed, this will lead us to recursively lock the
1803 * inode. There's also the dinode i_size state which
1804 * can be lost via setattr during extending writes (we
1805 * set inode->i_size at the end of a write. */
1806 if (should_remove_suid(dentry)) {
1807 if (meta_level == 0) {
1808 ocfs2_inode_unlock(inode, meta_level);
1809 meta_level = 1;
1810 continue;
1811 }
1812
1813 ret = ocfs2_write_remove_suid(inode);
1814 if (ret < 0) {
1815 mlog_errno(ret);
1816 goto out_unlock;
1817 }
1818 }
1819
1820 /* work on a copy of ppos until we're sure that we won't have
1821 * to recalculate it due to relocking. */
1822 if (appending) {
1823 saved_pos = i_size_read(inode);
1824 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
1825 } else {
1826 saved_pos = *ppos;
1827 }
1828
1829 end = saved_pos + count;
1830
1831 ret = ocfs2_check_range_for_refcount(inode, saved_pos, count);
1832 if (ret == 1) {
1833 ocfs2_inode_unlock(inode, meta_level);
1834 meta_level = -1;
1835
1836 ret = ocfs2_prepare_inode_for_refcount(inode,
1837 saved_pos,
1838 count,
1839 &meta_level);
1840 if (has_refcount)
1841 *has_refcount = 1;
1842 if (direct_io)
1843 *direct_io = 0;
1844 }
1845
1846 if (ret < 0) {
1847 mlog_errno(ret);
1848 goto out_unlock;
1849 }
1850
1851 /*
1852 * Skip the O_DIRECT checks if we don't need
1853 * them.
1854 */
1855 if (!direct_io || !(*direct_io))
1856 break;
1857
1858 /*
1859 * There's no sane way to do direct writes to an inode
1860 * with inline data.
1861 */
1862 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1863 *direct_io = 0;
1864 break;
1865 }
1866
1867 /*
1868 * Allowing concurrent direct writes means
1869 * i_size changes wouldn't be synchronized, so
1870 * one node could wind up truncating another
1871 * nodes writes.
1872 */
1873 if (end > i_size_read(inode)) {
1874 *direct_io = 0;
1875 break;
1876 }
1877
1878 /*
1879 * We don't fill holes during direct io, so
1880 * check for them here. If any are found, the
1881 * caller will have to retake some cluster
1882 * locks and initiate the io as buffered.
1883 */
1884 ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
1885 if (ret == 1) {
1886 *direct_io = 0;
1887 ret = 0;
1888 } else if (ret < 0)
1889 mlog_errno(ret);
1890 break;
1891 }
1892
1893 if (appending)
1894 *ppos = saved_pos;
1895
1896 out_unlock:
1897 if (meta_level >= 0)
1898 ocfs2_inode_unlock(inode, meta_level);
1899
1900 out:
1901 return ret;
1902 }
1903
1904 static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
1905 const struct iovec *iov,
1906 unsigned long nr_segs,
1907 loff_t pos)
1908 {
1909 int ret, direct_io, appending, rw_level, have_alloc_sem = 0;
1910 int can_do_direct, has_refcount = 0;
1911 ssize_t written = 0;
1912 size_t ocount; /* original count */
1913 size_t count; /* after file limit checks */
1914 loff_t old_size, *ppos = &iocb->ki_pos;
1915 u32 old_clusters;
1916 struct file *file = iocb->ki_filp;
1917 struct inode *inode = file->f_path.dentry->d_inode;
1918 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1919
1920 mlog_entry("(0x%p, %u, '%.*s')\n", file,
1921 (unsigned int)nr_segs,
1922 file->f_path.dentry->d_name.len,
1923 file->f_path.dentry->d_name.name);
1924
1925 if (iocb->ki_left == 0)
1926 return 0;
1927
1928 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
1929
1930 appending = file->f_flags & O_APPEND ? 1 : 0;
1931 direct_io = file->f_flags & O_DIRECT ? 1 : 0;
1932
1933 mutex_lock(&inode->i_mutex);
1934
1935 relock:
1936 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
1937 if (direct_io) {
1938 down_read(&inode->i_alloc_sem);
1939 have_alloc_sem = 1;
1940 }
1941
1942 /* concurrent O_DIRECT writes are allowed */
1943 rw_level = !direct_io;
1944 ret = ocfs2_rw_lock(inode, rw_level);
1945 if (ret < 0) {
1946 mlog_errno(ret);
1947 goto out_sems;
1948 }
1949
1950 can_do_direct = direct_io;
1951 ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos,
1952 iocb->ki_left, appending,
1953 &can_do_direct, &has_refcount);
1954 if (ret < 0) {
1955 mlog_errno(ret);
1956 goto out;
1957 }
1958
1959 /*
1960 * We can't complete the direct I/O as requested, fall back to
1961 * buffered I/O.
1962 */
1963 if (direct_io && !can_do_direct) {
1964 ocfs2_rw_unlock(inode, rw_level);
1965 up_read(&inode->i_alloc_sem);
1966
1967 have_alloc_sem = 0;
1968 rw_level = -1;
1969
1970 direct_io = 0;
1971 goto relock;
1972 }
1973
1974 /*
1975 * To later detect whether a journal commit for sync writes is
1976 * necessary, we sample i_size, and cluster count here.
1977 */
1978 old_size = i_size_read(inode);
1979 old_clusters = OCFS2_I(inode)->ip_clusters;
1980
1981 /* communicate with ocfs2_dio_end_io */
1982 ocfs2_iocb_set_rw_locked(iocb, rw_level);
1983
1984 if (direct_io) {
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 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
1997 ppos, count, ocount);
1998 if (written < 0) {
1999 /*
2000 * direct write may have instantiated a few
2001 * blocks outside i_size. Trim these off again.
2002 * Don't need i_size_read because we hold i_mutex.
2003 */
2004 if (*ppos + count > inode->i_size)
2005 vmtruncate(inode, inode->i_size);
2006 ret = written;
2007 goto out_dio;
2008 }
2009 } else {
2010 written = __generic_file_aio_write(iocb, iov, nr_segs, ppos);
2011 }
2012
2013 out_dio:
2014 /* buffered aio wouldn't have proper lock coverage today */
2015 BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
2016
2017 if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
2018 ((file->f_flags & O_DIRECT) && has_refcount)) {
2019 ret = filemap_fdatawrite_range(file->f_mapping, pos,
2020 pos + count - 1);
2021 if (ret < 0)
2022 written = ret;
2023
2024 if (!ret && (old_size != i_size_read(inode) ||
2025 old_clusters != OCFS2_I(inode)->ip_clusters ||
2026 has_refcount)) {
2027 ret = jbd2_journal_force_commit(osb->journal->j_journal);
2028 if (ret < 0)
2029 written = ret;
2030 }
2031
2032 if (!ret)
2033 ret = filemap_fdatawait_range(file->f_mapping, pos,
2034 pos + count - 1);
2035 }
2036
2037 /*
2038 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2039 * function pointer which is called when o_direct io completes so that
2040 * it can unlock our rw lock. (it's the clustered equivalent of
2041 * i_alloc_sem; protects truncate from racing with pending ios).
2042 * Unfortunately there are error cases which call end_io and others
2043 * that don't. so we don't have to unlock the rw_lock if either an
2044 * async dio is going to do it in the future or an end_io after an
2045 * error has already done it.
2046 */
2047 if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2048 rw_level = -1;
2049 have_alloc_sem = 0;
2050 }
2051
2052 out:
2053 if (rw_level != -1)
2054 ocfs2_rw_unlock(inode, rw_level);
2055
2056 out_sems:
2057 if (have_alloc_sem)
2058 up_read(&inode->i_alloc_sem);
2059
2060 mutex_unlock(&inode->i_mutex);
2061
2062 if (written)
2063 ret = written;
2064 mlog_exit(ret);
2065 return ret;
2066 }
2067
2068 static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
2069 struct file *out,
2070 struct splice_desc *sd)
2071 {
2072 int ret;
2073
2074 ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, &sd->pos,
2075 sd->total_len, 0, NULL, NULL);
2076 if (ret < 0) {
2077 mlog_errno(ret);
2078 return ret;
2079 }
2080
2081 return splice_from_pipe_feed(pipe, sd, pipe_to_file);
2082 }
2083
2084 static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2085 struct file *out,
2086 loff_t *ppos,
2087 size_t len,
2088 unsigned int flags)
2089 {
2090 int ret;
2091 struct address_space *mapping = out->f_mapping;
2092 struct inode *inode = mapping->host;
2093 struct splice_desc sd = {
2094 .total_len = len,
2095 .flags = flags,
2096 .pos = *ppos,
2097 .u.file = out,
2098 };
2099
2100 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
2101 (unsigned int)len,
2102 out->f_path.dentry->d_name.len,
2103 out->f_path.dentry->d_name.name);
2104
2105 if (pipe->inode)
2106 mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT);
2107
2108 splice_from_pipe_begin(&sd);
2109 do {
2110 ret = splice_from_pipe_next(pipe, &sd);
2111 if (ret <= 0)
2112 break;
2113
2114 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2115 ret = ocfs2_rw_lock(inode, 1);
2116 if (ret < 0)
2117 mlog_errno(ret);
2118 else {
2119 ret = ocfs2_splice_to_file(pipe, out, &sd);
2120 ocfs2_rw_unlock(inode, 1);
2121 }
2122 mutex_unlock(&inode->i_mutex);
2123 } while (ret > 0);
2124 splice_from_pipe_end(pipe, &sd);
2125
2126 if (pipe->inode)
2127 mutex_unlock(&pipe->inode->i_mutex);
2128
2129 if (sd.num_spliced)
2130 ret = sd.num_spliced;
2131
2132 if (ret > 0) {
2133 unsigned long nr_pages;
2134 int err;
2135
2136 nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
2137
2138 err = generic_write_sync(out, *ppos, ret);
2139 if (err)
2140 ret = err;
2141 else
2142 *ppos += ret;
2143
2144 balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
2145 }
2146
2147 mlog_exit(ret);
2148 return ret;
2149 }
2150
2151 static ssize_t ocfs2_file_splice_read(struct file *in,
2152 loff_t *ppos,
2153 struct pipe_inode_info *pipe,
2154 size_t len,
2155 unsigned int flags)
2156 {
2157 int ret = 0, lock_level = 0;
2158 struct inode *inode = in->f_path.dentry->d_inode;
2159
2160 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
2161 (unsigned int)len,
2162 in->f_path.dentry->d_name.len,
2163 in->f_path.dentry->d_name.name);
2164
2165 /*
2166 * See the comment in ocfs2_file_aio_read()
2167 */
2168 ret = ocfs2_inode_lock_atime(inode, in->f_vfsmnt, &lock_level);
2169 if (ret < 0) {
2170 mlog_errno(ret);
2171 goto bail;
2172 }
2173 ocfs2_inode_unlock(inode, lock_level);
2174
2175 ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2176
2177 bail:
2178 mlog_exit(ret);
2179 return ret;
2180 }
2181
2182 static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
2183 const struct iovec *iov,
2184 unsigned long nr_segs,
2185 loff_t pos)
2186 {
2187 int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
2188 struct file *filp = iocb->ki_filp;
2189 struct inode *inode = filp->f_path.dentry->d_inode;
2190
2191 mlog_entry("(0x%p, %u, '%.*s')\n", filp,
2192 (unsigned int)nr_segs,
2193 filp->f_path.dentry->d_name.len,
2194 filp->f_path.dentry->d_name.name);
2195
2196 if (!inode) {
2197 ret = -EINVAL;
2198 mlog_errno(ret);
2199 goto bail;
2200 }
2201
2202 /*
2203 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
2204 * need locks to protect pending reads from racing with truncate.
2205 */
2206 if (filp->f_flags & O_DIRECT) {
2207 down_read(&inode->i_alloc_sem);
2208 have_alloc_sem = 1;
2209
2210 ret = ocfs2_rw_lock(inode, 0);
2211 if (ret < 0) {
2212 mlog_errno(ret);
2213 goto bail;
2214 }
2215 rw_level = 0;
2216 /* communicate with ocfs2_dio_end_io */
2217 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2218 }
2219
2220 /*
2221 * We're fine letting folks race truncates and extending
2222 * writes with read across the cluster, just like they can
2223 * locally. Hence no rw_lock during read.
2224 *
2225 * Take and drop the meta data lock to update inode fields
2226 * like i_size. This allows the checks down below
2227 * generic_file_aio_read() a chance of actually working.
2228 */
2229 ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2230 if (ret < 0) {
2231 mlog_errno(ret);
2232 goto bail;
2233 }
2234 ocfs2_inode_unlock(inode, lock_level);
2235
2236 ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
2237 if (ret == -EINVAL)
2238 mlog(0, "generic_file_aio_read returned -EINVAL\n");
2239
2240 /* buffered aio wouldn't have proper lock coverage today */
2241 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2242
2243 /* see ocfs2_file_aio_write */
2244 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2245 rw_level = -1;
2246 have_alloc_sem = 0;
2247 }
2248
2249 bail:
2250 if (have_alloc_sem)
2251 up_read(&inode->i_alloc_sem);
2252 if (rw_level != -1)
2253 ocfs2_rw_unlock(inode, rw_level);
2254 mlog_exit(ret);
2255
2256 return ret;
2257 }
2258
2259 const struct inode_operations ocfs2_file_iops = {
2260 .setattr = ocfs2_setattr,
2261 .getattr = ocfs2_getattr,
2262 .permission = ocfs2_permission,
2263 .setxattr = generic_setxattr,
2264 .getxattr = generic_getxattr,
2265 .listxattr = ocfs2_listxattr,
2266 .removexattr = generic_removexattr,
2267 .fallocate = ocfs2_fallocate,
2268 .fiemap = ocfs2_fiemap,
2269 };
2270
2271 const struct inode_operations ocfs2_special_file_iops = {
2272 .setattr = ocfs2_setattr,
2273 .getattr = ocfs2_getattr,
2274 .permission = ocfs2_permission,
2275 };
2276
2277 /*
2278 * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2279 * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2280 */
2281 const struct file_operations ocfs2_fops = {
2282 .llseek = generic_file_llseek,
2283 .read = do_sync_read,
2284 .write = do_sync_write,
2285 .mmap = ocfs2_mmap,
2286 .fsync = ocfs2_sync_file,
2287 .release = ocfs2_file_release,
2288 .open = ocfs2_file_open,
2289 .aio_read = ocfs2_file_aio_read,
2290 .aio_write = ocfs2_file_aio_write,
2291 .unlocked_ioctl = ocfs2_ioctl,
2292 #ifdef CONFIG_COMPAT
2293 .compat_ioctl = ocfs2_compat_ioctl,
2294 #endif
2295 .lock = ocfs2_lock,
2296 .flock = ocfs2_flock,
2297 .splice_read = ocfs2_file_splice_read,
2298 .splice_write = ocfs2_file_splice_write,
2299 };
2300
2301 const struct file_operations ocfs2_dops = {
2302 .llseek = generic_file_llseek,
2303 .read = generic_read_dir,
2304 .readdir = ocfs2_readdir,
2305 .fsync = ocfs2_sync_file,
2306 .release = ocfs2_dir_release,
2307 .open = ocfs2_dir_open,
2308 .unlocked_ioctl = ocfs2_ioctl,
2309 #ifdef CONFIG_COMPAT
2310 .compat_ioctl = ocfs2_compat_ioctl,
2311 #endif
2312 .lock = ocfs2_lock,
2313 .flock = ocfs2_flock,
2314 };
2315
2316 /*
2317 * POSIX-lockless variants of our file_operations.
2318 *
2319 * These will be used if the underlying cluster stack does not support
2320 * posix file locking, if the user passes the "localflocks" mount
2321 * option, or if we have a local-only fs.
2322 *
2323 * ocfs2_flock is in here because all stacks handle UNIX file locks,
2324 * so we still want it in the case of no stack support for
2325 * plocks. Internally, it will do the right thing when asked to ignore
2326 * the cluster.
2327 */
2328 const struct file_operations ocfs2_fops_no_plocks = {
2329 .llseek = generic_file_llseek,
2330 .read = do_sync_read,
2331 .write = do_sync_write,
2332 .mmap = ocfs2_mmap,
2333 .fsync = ocfs2_sync_file,
2334 .release = ocfs2_file_release,
2335 .open = ocfs2_file_open,
2336 .aio_read = ocfs2_file_aio_read,
2337 .aio_write = ocfs2_file_aio_write,
2338 .unlocked_ioctl = ocfs2_ioctl,
2339 #ifdef CONFIG_COMPAT
2340 .compat_ioctl = ocfs2_compat_ioctl,
2341 #endif
2342 .flock = ocfs2_flock,
2343 .splice_read = ocfs2_file_splice_read,
2344 .splice_write = ocfs2_file_splice_write,
2345 };
2346
2347 const struct file_operations ocfs2_dops_no_plocks = {
2348 .llseek = generic_file_llseek,
2349 .read = generic_read_dir,
2350 .readdir = ocfs2_readdir,
2351 .fsync = ocfs2_sync_file,
2352 .release = ocfs2_dir_release,
2353 .open = ocfs2_dir_open,
2354 .unlocked_ioctl = ocfs2_ioctl,
2355 #ifdef CONFIG_COMPAT
2356 .compat_ioctl = ocfs2_compat_ioctl,
2357 #endif
2358 .flock = ocfs2_flock,
2359 };