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ccd979bd
MF
1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * file.c
5 *
6 * File open, close, extend, truncate
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
16f7e0fe 26#include <linux/capability.h>
ccd979bd
MF
27#include <linux/fs.h>
28#include <linux/types.h>
29#include <linux/slab.h>
30#include <linux/highmem.h>
31#include <linux/pagemap.h>
32#include <linux/uio.h>
e2057c5a 33#include <linux/sched.h>
d6b29d7c 34#include <linux/splice.h>
7f1a37e3 35#include <linux/mount.h>
9517bac6 36#include <linux/writeback.h>
385820a3 37#include <linux/falloc.h>
ccd979bd
MF
38
39#define MLOG_MASK_PREFIX ML_INODE
40#include <cluster/masklog.h>
41
42#include "ocfs2.h"
43
44#include "alloc.h"
45#include "aops.h"
46#include "dir.h"
47#include "dlmglue.h"
48#include "extent_map.h"
49#include "file.h"
50#include "sysfile.h"
51#include "inode.h"
ca4d147e 52#include "ioctl.h"
ccd979bd
MF
53#include "journal.h"
54#include "mmap.h"
55#include "suballoc.h"
56#include "super.h"
57
58#include "buffer_head_io.h"
59
60static int ocfs2_sync_inode(struct inode *inode)
61{
62 filemap_fdatawrite(inode->i_mapping);
63 return sync_mapping_buffers(inode->i_mapping);
64}
65
66static int ocfs2_file_open(struct inode *inode, struct file *file)
67{
68 int status;
69 int mode = file->f_flags;
70 struct ocfs2_inode_info *oi = OCFS2_I(inode);
71
72 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
d28c9174 73 file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name);
ccd979bd
MF
74
75 spin_lock(&oi->ip_lock);
76
77 /* Check that the inode hasn't been wiped from disk by another
78 * node. If it hasn't then we're safe as long as we hold the
79 * spin lock until our increment of open count. */
80 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
81 spin_unlock(&oi->ip_lock);
82
83 status = -ENOENT;
84 goto leave;
85 }
86
87 if (mode & O_DIRECT)
88 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
89
90 oi->ip_open_count++;
91 spin_unlock(&oi->ip_lock);
92 status = 0;
93leave:
94 mlog_exit(status);
95 return status;
96}
97
98static int ocfs2_file_release(struct inode *inode, struct file *file)
99{
100 struct ocfs2_inode_info *oi = OCFS2_I(inode);
101
102 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
d28c9174
JS
103 file->f_path.dentry->d_name.len,
104 file->f_path.dentry->d_name.name);
ccd979bd
MF
105
106 spin_lock(&oi->ip_lock);
107 if (!--oi->ip_open_count)
108 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
109 spin_unlock(&oi->ip_lock);
110
111 mlog_exit(0);
112
113 return 0;
114}
115
116static int ocfs2_sync_file(struct file *file,
117 struct dentry *dentry,
118 int datasync)
119{
120 int err = 0;
121 journal_t *journal;
122 struct inode *inode = dentry->d_inode;
123 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
124
125 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync,
126 dentry->d_name.len, dentry->d_name.name);
127
128 err = ocfs2_sync_inode(dentry->d_inode);
129 if (err)
130 goto bail;
131
132 journal = osb->journal->j_journal;
133 err = journal_force_commit(journal);
134
135bail:
136 mlog_exit(err);
137
138 return (err < 0) ? -EIO : 0;
139}
140
7f1a37e3
TY
141int ocfs2_should_update_atime(struct inode *inode,
142 struct vfsmount *vfsmnt)
143{
144 struct timespec now;
145 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
146
147 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
148 return 0;
149
150 if ((inode->i_flags & S_NOATIME) ||
151 ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
152 return 0;
153
6c2aad05
MF
154 /*
155 * We can be called with no vfsmnt structure - NFSD will
156 * sometimes do this.
157 *
158 * Note that our action here is different than touch_atime() -
159 * if we can't tell whether this is a noatime mount, then we
160 * don't know whether to trust the value of s_atime_quantum.
161 */
162 if (vfsmnt == NULL)
163 return 0;
164
7f1a37e3
TY
165 if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
166 ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
167 return 0;
168
7e913c53
MF
169 if (vfsmnt->mnt_flags & MNT_RELATIME) {
170 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
171 (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
172 return 1;
173
174 return 0;
175 }
176
7f1a37e3
TY
177 now = CURRENT_TIME;
178 if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
179 return 0;
180 else
181 return 1;
182}
183
184int ocfs2_update_inode_atime(struct inode *inode,
185 struct buffer_head *bh)
186{
187 int ret;
188 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
189 handle_t *handle;
c11e9faf 190 struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
7f1a37e3
TY
191
192 mlog_entry_void();
193
194 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
195 if (handle == NULL) {
196 ret = -ENOMEM;
197 mlog_errno(ret);
198 goto out;
199 }
200
c11e9faf
MF
201 ret = ocfs2_journal_access(handle, inode, bh,
202 OCFS2_JOURNAL_ACCESS_WRITE);
203 if (ret) {
204 mlog_errno(ret);
205 goto out_commit;
206 }
207
208 /*
209 * Don't use ocfs2_mark_inode_dirty() here as we don't always
210 * have i_mutex to guard against concurrent changes to other
211 * inode fields.
212 */
7f1a37e3 213 inode->i_atime = CURRENT_TIME;
c11e9faf
MF
214 di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
215 di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
216
217 ret = ocfs2_journal_dirty(handle, bh);
7f1a37e3
TY
218 if (ret < 0)
219 mlog_errno(ret);
220
c11e9faf 221out_commit:
7f1a37e3
TY
222 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
223out:
224 mlog_exit(ret);
225 return ret;
226}
227
6cb129f5
AB
228static int ocfs2_set_inode_size(handle_t *handle,
229 struct inode *inode,
230 struct buffer_head *fe_bh,
231 u64 new_i_size)
ccd979bd
MF
232{
233 int status;
234
235 mlog_entry_void();
236 i_size_write(inode, new_i_size);
8110b073 237 inode->i_blocks = ocfs2_inode_sector_count(inode);
ccd979bd
MF
238 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
239
240 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
241 if (status < 0) {
242 mlog_errno(status);
243 goto bail;
244 }
245
246bail:
247 mlog_exit(status);
248 return status;
249}
250
251static int ocfs2_simple_size_update(struct inode *inode,
252 struct buffer_head *di_bh,
253 u64 new_i_size)
254{
255 int ret;
256 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1fabe148 257 handle_t *handle = NULL;
ccd979bd 258
65eff9cc 259 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
ccd979bd
MF
260 if (handle == NULL) {
261 ret = -ENOMEM;
262 mlog_errno(ret);
263 goto out;
264 }
265
266 ret = ocfs2_set_inode_size(handle, inode, di_bh,
267 new_i_size);
268 if (ret < 0)
269 mlog_errno(ret);
270
02dc1af4 271 ocfs2_commit_trans(osb, handle);
ccd979bd
MF
272out:
273 return ret;
274}
275
276static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
277 struct inode *inode,
278 struct buffer_head *fe_bh,
279 u64 new_i_size)
280{
281 int status;
1fabe148 282 handle_t *handle;
60b11392 283 struct ocfs2_dinode *di;
35edec1d 284 u64 cluster_bytes;
ccd979bd
MF
285
286 mlog_entry_void();
287
288 /* TODO: This needs to actually orphan the inode in this
289 * transaction. */
290
65eff9cc 291 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
ccd979bd
MF
292 if (IS_ERR(handle)) {
293 status = PTR_ERR(handle);
294 mlog_errno(status);
295 goto out;
296 }
297
60b11392
MF
298 status = ocfs2_journal_access(handle, inode, fe_bh,
299 OCFS2_JOURNAL_ACCESS_WRITE);
300 if (status < 0) {
301 mlog_errno(status);
302 goto out_commit;
303 }
304
305 /*
306 * Do this before setting i_size.
307 */
35edec1d
MF
308 cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
309 status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
310 cluster_bytes);
60b11392
MF
311 if (status) {
312 mlog_errno(status);
313 goto out_commit;
314 }
315
316 i_size_write(inode, new_i_size);
60b11392
MF
317 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
318
319 di = (struct ocfs2_dinode *) fe_bh->b_data;
320 di->i_size = cpu_to_le64(new_i_size);
321 di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
322 di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
323
324 status = ocfs2_journal_dirty(handle, fe_bh);
ccd979bd
MF
325 if (status < 0)
326 mlog_errno(status);
327
60b11392 328out_commit:
02dc1af4 329 ocfs2_commit_trans(osb, handle);
ccd979bd 330out:
60b11392 331
ccd979bd
MF
332 mlog_exit(status);
333 return status;
334}
335
336static int ocfs2_truncate_file(struct inode *inode,
337 struct buffer_head *di_bh,
338 u64 new_i_size)
339{
340 int status = 0;
341 struct ocfs2_dinode *fe = NULL;
342 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
343 struct ocfs2_truncate_context *tc = NULL;
344
b0697053
MF
345 mlog_entry("(inode = %llu, new_i_size = %llu\n",
346 (unsigned long long)OCFS2_I(inode)->ip_blkno,
347 (unsigned long long)new_i_size);
ccd979bd 348
ccd979bd
MF
349 fe = (struct ocfs2_dinode *) di_bh->b_data;
350 if (!OCFS2_IS_VALID_DINODE(fe)) {
351 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
352 status = -EIO;
353 goto bail;
354 }
355
356 mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
b0697053
MF
357 "Inode %llu, inode i_size = %lld != di "
358 "i_size = %llu, i_flags = 0x%x\n",
359 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd 360 i_size_read(inode),
b0697053
MF
361 (unsigned long long)le64_to_cpu(fe->i_size),
362 le32_to_cpu(fe->i_flags));
ccd979bd
MF
363
364 if (new_i_size > le64_to_cpu(fe->i_size)) {
b0697053
MF
365 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
366 (unsigned long long)le64_to_cpu(fe->i_size),
367 (unsigned long long)new_i_size);
ccd979bd
MF
368 status = -EINVAL;
369 mlog_errno(status);
370 goto bail;
371 }
372
b0697053
MF
373 mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
374 (unsigned long long)le64_to_cpu(fe->i_blkno),
375 (unsigned long long)le64_to_cpu(fe->i_size),
376 (unsigned long long)new_i_size);
ccd979bd
MF
377
378 /* lets handle the simple truncate cases before doing any more
379 * cluster locking. */
380 if (new_i_size == le64_to_cpu(fe->i_size))
381 goto bail;
382
2e89b2e4
MF
383 down_write(&OCFS2_I(inode)->ip_alloc_sem);
384
ab0920ce
MF
385 /* This forces other nodes to sync and drop their pages. Do
386 * this even if we have a truncate without allocation change -
387 * ocfs2 cluster sizes can be much greater than page size, so
388 * we have to truncate them anyway. */
389 status = ocfs2_data_lock(inode, 1);
390 if (status < 0) {
2e89b2e4
MF
391 up_write(&OCFS2_I(inode)->ip_alloc_sem);
392
ab0920ce
MF
393 mlog_errno(status);
394 goto bail;
395 }
ab0920ce 396
2e89b2e4
MF
397 unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
398 truncate_inode_pages(inode->i_mapping, new_i_size);
399
1afc32b9
MF
400 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
401 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
402 i_size_read(inode), 0);
403 if (status)
404 mlog_errno(status);
405
406 goto bail_unlock_data;
407 }
408
ccd979bd
MF
409 /* alright, we're going to need to do a full blown alloc size
410 * change. Orphan the inode so that recovery can complete the
411 * truncate if necessary. This does the task of marking
412 * i_size. */
413 status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
414 if (status < 0) {
415 mlog_errno(status);
60b11392 416 goto bail_unlock_data;
ccd979bd
MF
417 }
418
419 status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
420 if (status < 0) {
421 mlog_errno(status);
60b11392 422 goto bail_unlock_data;
ccd979bd
MF
423 }
424
425 status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
426 if (status < 0) {
427 mlog_errno(status);
60b11392 428 goto bail_unlock_data;
ccd979bd
MF
429 }
430
431 /* TODO: orphan dir cleanup here. */
60b11392
MF
432bail_unlock_data:
433 ocfs2_data_unlock(inode, 1);
434
2e89b2e4
MF
435 up_write(&OCFS2_I(inode)->ip_alloc_sem);
436
ccd979bd
MF
437bail:
438
439 mlog_exit(status);
440 return status;
441}
442
443/*
444 * extend allocation only here.
445 * we'll update all the disk stuff, and oip->alloc_size
446 *
447 * expect stuff to be locked, a transaction started and enough data /
448 * metadata reservations in the contexts.
449 *
450 * Will return -EAGAIN, and a reason if a restart is needed.
451 * If passed in, *reason will always be set, even in error.
452 */
453int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
454 struct inode *inode,
dcd0538f 455 u32 *logical_offset,
ccd979bd 456 u32 clusters_to_add,
2ae99a60 457 int mark_unwritten,
ccd979bd 458 struct buffer_head *fe_bh,
1fabe148 459 handle_t *handle,
ccd979bd
MF
460 struct ocfs2_alloc_context *data_ac,
461 struct ocfs2_alloc_context *meta_ac,
462 enum ocfs2_alloc_restarted *reason_ret)
463{
464 int status = 0;
465 int free_extents;
466 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
467 enum ocfs2_alloc_restarted reason = RESTART_NONE;
468 u32 bit_off, num_bits;
469 u64 block;
2ae99a60 470 u8 flags = 0;
ccd979bd
MF
471
472 BUG_ON(!clusters_to_add);
473
2ae99a60
MF
474 if (mark_unwritten)
475 flags = OCFS2_EXT_UNWRITTEN;
476
ccd979bd
MF
477 free_extents = ocfs2_num_free_extents(osb, inode, fe);
478 if (free_extents < 0) {
479 status = free_extents;
480 mlog_errno(status);
481 goto leave;
482 }
483
484 /* there are two cases which could cause us to EAGAIN in the
485 * we-need-more-metadata case:
486 * 1) we haven't reserved *any*
487 * 2) we are so fragmented, we've needed to add metadata too
488 * many times. */
489 if (!free_extents && !meta_ac) {
490 mlog(0, "we haven't reserved any metadata!\n");
491 status = -EAGAIN;
492 reason = RESTART_META;
493 goto leave;
494 } else if ((!free_extents)
495 && (ocfs2_alloc_context_bits_left(meta_ac)
496 < ocfs2_extend_meta_needed(fe))) {
497 mlog(0, "filesystem is really fragmented...\n");
498 status = -EAGAIN;
499 reason = RESTART_META;
500 goto leave;
501 }
502
415cb800
MF
503 status = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
504 clusters_to_add, &bit_off, &num_bits);
ccd979bd
MF
505 if (status < 0) {
506 if (status != -ENOSPC)
507 mlog_errno(status);
508 goto leave;
509 }
510
511 BUG_ON(num_bits > clusters_to_add);
512
513 /* reserve our write early -- insert_extent may update the inode */
514 status = ocfs2_journal_access(handle, inode, fe_bh,
515 OCFS2_JOURNAL_ACCESS_WRITE);
516 if (status < 0) {
517 mlog_errno(status);
518 goto leave;
519 }
520
521 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
b0697053
MF
522 mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
523 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
dcd0538f
MF
524 status = ocfs2_insert_extent(osb, handle, inode, fe_bh,
525 *logical_offset, block, num_bits,
2ae99a60 526 flags, meta_ac);
ccd979bd
MF
527 if (status < 0) {
528 mlog_errno(status);
529 goto leave;
530 }
531
ccd979bd
MF
532 status = ocfs2_journal_dirty(handle, fe_bh);
533 if (status < 0) {
534 mlog_errno(status);
535 goto leave;
536 }
537
538 clusters_to_add -= num_bits;
dcd0538f 539 *logical_offset += num_bits;
ccd979bd
MF
540
541 if (clusters_to_add) {
542 mlog(0, "need to alloc once more, clusters = %u, wanted = "
543 "%u\n", fe->i_clusters, clusters_to_add);
544 status = -EAGAIN;
545 reason = RESTART_TRANS;
546 }
547
548leave:
549 mlog_exit(status);
550 if (reason_ret)
551 *reason_ret = reason;
552 return status;
553}
554
abf8b156
MF
555/*
556 * For a given allocation, determine which allocators will need to be
557 * accessed, and lock them, reserving the appropriate number of bits.
558 *
2ae99a60
MF
559 * Sparse file systems call this from ocfs2_write_begin_nolock()
560 * and ocfs2_allocate_unwritten_extents().
561 *
562 * File systems which don't support holes call this from
563 * ocfs2_extend_allocation().
abf8b156 564 */
9517bac6 565int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di,
b27b7cbc 566 u32 clusters_to_add, u32 extents_to_split,
9517bac6
MF
567 struct ocfs2_alloc_context **data_ac,
568 struct ocfs2_alloc_context **meta_ac)
abf8b156 569{
063c4561 570 int ret = 0, num_free_extents;
b27b7cbc 571 unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
abf8b156
MF
572 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
573
574 *meta_ac = NULL;
063c4561
MF
575 if (data_ac)
576 *data_ac = NULL;
577
578 BUG_ON(clusters_to_add != 0 && data_ac == NULL);
abf8b156
MF
579
580 mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
b27b7cbc 581 "clusters_to_add = %u, extents_to_split = %u\n",
abf8b156 582 (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode),
b27b7cbc 583 le32_to_cpu(di->i_clusters), clusters_to_add, extents_to_split);
abf8b156
MF
584
585 num_free_extents = ocfs2_num_free_extents(osb, inode, di);
586 if (num_free_extents < 0) {
587 ret = num_free_extents;
588 mlog_errno(ret);
589 goto out;
590 }
591
592 /*
593 * Sparse allocation file systems need to be more conservative
594 * with reserving room for expansion - the actual allocation
595 * happens while we've got a journal handle open so re-taking
596 * a cluster lock (because we ran out of room for another
597 * extent) will violate ordering rules.
598 *
9517bac6 599 * Most of the time we'll only be seeing this 1 cluster at a time
abf8b156 600 * anyway.
b27b7cbc
MF
601 *
602 * Always lock for any unwritten extents - we might want to
603 * add blocks during a split.
abf8b156
MF
604 */
605 if (!num_free_extents ||
b27b7cbc 606 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
abf8b156
MF
607 ret = ocfs2_reserve_new_metadata(osb, di, meta_ac);
608 if (ret < 0) {
609 if (ret != -ENOSPC)
610 mlog_errno(ret);
611 goto out;
612 }
613 }
614
063c4561
MF
615 if (clusters_to_add == 0)
616 goto out;
617
abf8b156
MF
618 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
619 if (ret < 0) {
620 if (ret != -ENOSPC)
621 mlog_errno(ret);
622 goto out;
623 }
624
625out:
626 if (ret) {
627 if (*meta_ac) {
628 ocfs2_free_alloc_context(*meta_ac);
629 *meta_ac = NULL;
630 }
631
632 /*
633 * We cannot have an error and a non null *data_ac.
634 */
635 }
636
637 return ret;
638}
639
2ae99a60
MF
640static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
641 u32 clusters_to_add, int mark_unwritten)
ccd979bd
MF
642{
643 int status = 0;
644 int restart_func = 0;
abf8b156 645 int credits;
2ae99a60 646 u32 prev_clusters;
ccd979bd
MF
647 struct buffer_head *bh = NULL;
648 struct ocfs2_dinode *fe = NULL;
1fabe148 649 handle_t *handle = NULL;
ccd979bd
MF
650 struct ocfs2_alloc_context *data_ac = NULL;
651 struct ocfs2_alloc_context *meta_ac = NULL;
652 enum ocfs2_alloc_restarted why;
653 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
654
655 mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
656
dcd0538f
MF
657 /*
658 * This function only exists for file systems which don't
659 * support holes.
660 */
2ae99a60 661 BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
dcd0538f 662
ccd979bd
MF
663 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
664 OCFS2_BH_CACHED, inode);
665 if (status < 0) {
666 mlog_errno(status);
667 goto leave;
668 }
669
670 fe = (struct ocfs2_dinode *) bh->b_data;
671 if (!OCFS2_IS_VALID_DINODE(fe)) {
672 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
673 status = -EIO;
674 goto leave;
675 }
676
677restart_all:
678 BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
679
b27b7cbc 680 status = ocfs2_lock_allocators(inode, fe, clusters_to_add, 0, &data_ac,
9517bac6
MF
681 &meta_ac);
682 if (status) {
683 mlog_errno(status);
684 goto leave;
685 }
686
ccd979bd 687 credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
65eff9cc 688 handle = ocfs2_start_trans(osb, credits);
ccd979bd
MF
689 if (IS_ERR(handle)) {
690 status = PTR_ERR(handle);
691 handle = NULL;
692 mlog_errno(status);
693 goto leave;
694 }
695
696restarted_transaction:
697 /* reserve a write to the file entry early on - that we if we
698 * run out of credits in the allocation path, we can still
699 * update i_size. */
700 status = ocfs2_journal_access(handle, inode, bh,
701 OCFS2_JOURNAL_ACCESS_WRITE);
702 if (status < 0) {
703 mlog_errno(status);
704 goto leave;
705 }
706
707 prev_clusters = OCFS2_I(inode)->ip_clusters;
708
709 status = ocfs2_do_extend_allocation(osb,
710 inode,
dcd0538f 711 &logical_start,
ccd979bd 712 clusters_to_add,
2ae99a60 713 mark_unwritten,
ccd979bd
MF
714 bh,
715 handle,
716 data_ac,
717 meta_ac,
718 &why);
719 if ((status < 0) && (status != -EAGAIN)) {
720 if (status != -ENOSPC)
721 mlog_errno(status);
722 goto leave;
723 }
724
725 status = ocfs2_journal_dirty(handle, bh);
726 if (status < 0) {
727 mlog_errno(status);
728 goto leave;
729 }
730
731 spin_lock(&OCFS2_I(inode)->ip_lock);
732 clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
733 spin_unlock(&OCFS2_I(inode)->ip_lock);
734
735 if (why != RESTART_NONE && clusters_to_add) {
736 if (why == RESTART_META) {
737 mlog(0, "restarting function.\n");
738 restart_func = 1;
739 } else {
740 BUG_ON(why != RESTART_TRANS);
741
742 mlog(0, "restarting transaction.\n");
743 /* TODO: This can be more intelligent. */
744 credits = ocfs2_calc_extend_credits(osb->sb,
745 fe,
746 clusters_to_add);
1fabe148 747 status = ocfs2_extend_trans(handle, credits);
ccd979bd
MF
748 if (status < 0) {
749 /* handle still has to be committed at
750 * this point. */
751 status = -ENOMEM;
752 mlog_errno(status);
753 goto leave;
754 }
755 goto restarted_transaction;
756 }
757 }
758
b0697053 759 mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
1ca1a111
MF
760 le32_to_cpu(fe->i_clusters),
761 (unsigned long long)le64_to_cpu(fe->i_size));
ccd979bd
MF
762 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
763 OCFS2_I(inode)->ip_clusters, i_size_read(inode));
764
765leave:
ccd979bd 766 if (handle) {
02dc1af4 767 ocfs2_commit_trans(osb, handle);
ccd979bd
MF
768 handle = NULL;
769 }
770 if (data_ac) {
771 ocfs2_free_alloc_context(data_ac);
772 data_ac = NULL;
773 }
774 if (meta_ac) {
775 ocfs2_free_alloc_context(meta_ac);
776 meta_ac = NULL;
777 }
778 if ((!status) && restart_func) {
779 restart_func = 0;
780 goto restart_all;
781 }
782 if (bh) {
783 brelse(bh);
784 bh = NULL;
785 }
786
787 mlog_exit(status);
788 return status;
789}
790
791/* Some parts of this taken from generic_cont_expand, which turned out
792 * to be too fragile to do exactly what we need without us having to
53013cba
MF
793 * worry about recursive locking in ->prepare_write() and
794 * ->commit_write(). */
ccd979bd
MF
795static int ocfs2_write_zero_page(struct inode *inode,
796 u64 size)
797{
798 struct address_space *mapping = inode->i_mapping;
799 struct page *page;
800 unsigned long index;
801 unsigned int offset;
1fabe148 802 handle_t *handle = NULL;
ccd979bd
MF
803 int ret;
804
805 offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
806 /* ugh. in prepare/commit_write, if from==to==start of block, we
807 ** skip the prepare. make sure we never send an offset for the start
808 ** of a block
809 */
810 if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
811 offset++;
812 }
813 index = size >> PAGE_CACHE_SHIFT;
814
815 page = grab_cache_page(mapping, index);
816 if (!page) {
817 ret = -ENOMEM;
818 mlog_errno(ret);
819 goto out;
820 }
821
53013cba 822 ret = ocfs2_prepare_write_nolock(inode, page, offset, offset);
ccd979bd
MF
823 if (ret < 0) {
824 mlog_errno(ret);
825 goto out_unlock;
826 }
827
828 if (ocfs2_should_order_data(inode)) {
829 handle = ocfs2_start_walk_page_trans(inode, page, offset,
830 offset);
831 if (IS_ERR(handle)) {
832 ret = PTR_ERR(handle);
833 handle = NULL;
834 goto out_unlock;
835 }
836 }
837
838 /* must not update i_size! */
839 ret = block_commit_write(page, offset, offset);
840 if (ret < 0)
841 mlog_errno(ret);
842 else
843 ret = 0;
844
845 if (handle)
02dc1af4 846 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
ccd979bd
MF
847out_unlock:
848 unlock_page(page);
849 page_cache_release(page);
850out:
851 return ret;
852}
853
854static int ocfs2_zero_extend(struct inode *inode,
855 u64 zero_to_size)
856{
857 int ret = 0;
858 u64 start_off;
859 struct super_block *sb = inode->i_sb;
860
861 start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
862 while (start_off < zero_to_size) {
863 ret = ocfs2_write_zero_page(inode, start_off);
864 if (ret < 0) {
865 mlog_errno(ret);
866 goto out;
867 }
868
869 start_off += sb->s_blocksize;
e2057c5a
MF
870
871 /*
872 * Very large extends have the potential to lock up
873 * the cpu for extended periods of time.
874 */
875 cond_resched();
ccd979bd
MF
876 }
877
878out:
879 return ret;
880}
881
65ed39d6
MF
882int ocfs2_extend_no_holes(struct inode *inode, u64 new_i_size, u64 zero_to)
883{
884 int ret;
885 u32 clusters_to_add;
886 struct ocfs2_inode_info *oi = OCFS2_I(inode);
887
888 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
889 if (clusters_to_add < oi->ip_clusters)
890 clusters_to_add = 0;
891 else
892 clusters_to_add -= oi->ip_clusters;
893
894 if (clusters_to_add) {
895 ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
896 clusters_to_add, 0);
897 if (ret) {
898 mlog_errno(ret);
899 goto out;
900 }
901 }
902
903 /*
904 * Call this even if we don't add any clusters to the tree. We
905 * still need to zero the area between the old i_size and the
906 * new i_size.
907 */
908 ret = ocfs2_zero_extend(inode, zero_to);
909 if (ret < 0)
910 mlog_errno(ret);
911
912out:
913 return ret;
914}
915
ccd979bd
MF
916static int ocfs2_extend_file(struct inode *inode,
917 struct buffer_head *di_bh,
65ed39d6 918 u64 new_i_size)
ccd979bd 919{
1afc32b9
MF
920 int ret = 0, data_locked = 0;
921 struct ocfs2_inode_info *oi = OCFS2_I(inode);
ccd979bd 922
65ed39d6 923 BUG_ON(!di_bh);
53013cba 924
ccd979bd
MF
925 /* setattr sometimes calls us like this. */
926 if (new_i_size == 0)
927 goto out;
928
929 if (i_size_read(inode) == new_i_size)
930 goto out;
931 BUG_ON(new_i_size < i_size_read(inode));
932
1afc32b9
MF
933 /*
934 * Fall through for converting inline data, even if the fs
935 * supports sparse files.
936 *
937 * The check for inline data here is legal - nobody can add
938 * the feature since we have i_mutex. We must check it again
939 * after acquiring ip_alloc_sem though, as paths like mmap
940 * might have raced us to converting the inode to extents.
941 */
942 if (!(oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
943 && ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
3a0782d0 944 goto out_update_size;
ccd979bd 945
0effef77
MF
946 /*
947 * protect the pages that ocfs2_zero_extend is going to be
948 * pulling into the page cache.. we do this before the
949 * metadata extend so that we don't get into the situation
950 * where we've extended the metadata but can't get the data
951 * lock to zero.
952 */
953 ret = ocfs2_data_lock(inode, 1);
954 if (ret < 0) {
955 mlog_errno(ret);
956 goto out;
957 }
1afc32b9 958 data_locked = 1;
ccd979bd 959
0effef77 960 /*
65ed39d6
MF
961 * The alloc sem blocks people in read/write from reading our
962 * allocation until we're done changing it. We depend on
963 * i_mutex to block other extend/truncate calls while we're
964 * here.
0effef77 965 */
1afc32b9
MF
966 down_write(&oi->ip_alloc_sem);
967
968 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
969 /*
970 * We can optimize small extends by keeping the inodes
971 * inline data.
972 */
973 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
974 up_write(&oi->ip_alloc_sem);
975 goto out_update_size;
976 }
977
978 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
979 if (ret) {
980 up_write(&oi->ip_alloc_sem);
981
982 mlog_errno(ret);
983 goto out_unlock;
984 }
985 }
986
987 if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
988 ret = ocfs2_extend_no_holes(inode, new_i_size, new_i_size);
989
990 up_write(&oi->ip_alloc_sem);
65ed39d6 991
0effef77
MF
992 if (ret < 0) {
993 mlog_errno(ret);
994 goto out_unlock;
53013cba
MF
995 }
996
3a0782d0 997out_update_size:
65ed39d6
MF
998 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
999 if (ret < 0)
1000 mlog_errno(ret);
ccd979bd 1001
53013cba 1002out_unlock:
1afc32b9 1003 if (data_locked)
3a0782d0 1004 ocfs2_data_unlock(inode, 1);
53013cba 1005
ccd979bd
MF
1006out:
1007 return ret;
1008}
1009
1010int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1011{
1012 int status = 0, size_change;
1013 struct inode *inode = dentry->d_inode;
1014 struct super_block *sb = inode->i_sb;
1015 struct ocfs2_super *osb = OCFS2_SB(sb);
1016 struct buffer_head *bh = NULL;
1fabe148 1017 handle_t *handle = NULL;
ccd979bd
MF
1018
1019 mlog_entry("(0x%p, '%.*s')\n", dentry,
1020 dentry->d_name.len, dentry->d_name.name);
1021
1022 if (attr->ia_valid & ATTR_MODE)
1023 mlog(0, "mode change: %d\n", attr->ia_mode);
1024 if (attr->ia_valid & ATTR_UID)
1025 mlog(0, "uid change: %d\n", attr->ia_uid);
1026 if (attr->ia_valid & ATTR_GID)
1027 mlog(0, "gid change: %d\n", attr->ia_gid);
1028 if (attr->ia_valid & ATTR_SIZE)
1029 mlog(0, "size change...\n");
1030 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
1031 mlog(0, "time change...\n");
1032
1033#define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1034 | ATTR_GID | ATTR_UID | ATTR_MODE)
1035 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
1036 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
1037 return 0;
1038 }
1039
1040 status = inode_change_ok(inode, attr);
1041 if (status)
1042 return status;
1043
1044 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1045 if (size_change) {
1046 status = ocfs2_rw_lock(inode, 1);
1047 if (status < 0) {
1048 mlog_errno(status);
1049 goto bail;
1050 }
1051 }
1052
4bcec184 1053 status = ocfs2_meta_lock(inode, &bh, 1);
ccd979bd
MF
1054 if (status < 0) {
1055 if (status != -ENOENT)
1056 mlog_errno(status);
1057 goto bail_unlock_rw;
1058 }
1059
1060 if (size_change && attr->ia_size != i_size_read(inode)) {
ce76fd30
MF
1061 if (attr->ia_size > sb->s_maxbytes) {
1062 status = -EFBIG;
1063 goto bail_unlock;
1064 }
1065
ccd979bd
MF
1066 if (i_size_read(inode) > attr->ia_size)
1067 status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1068 else
65ed39d6 1069 status = ocfs2_extend_file(inode, bh, attr->ia_size);
ccd979bd
MF
1070 if (status < 0) {
1071 if (status != -ENOSPC)
1072 mlog_errno(status);
1073 status = -ENOSPC;
1074 goto bail_unlock;
1075 }
1076 }
1077
65eff9cc 1078 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
ccd979bd
MF
1079 if (IS_ERR(handle)) {
1080 status = PTR_ERR(handle);
1081 mlog_errno(status);
1082 goto bail_unlock;
1083 }
1084
7307de80
MF
1085 /*
1086 * This will intentionally not wind up calling vmtruncate(),
1087 * since all the work for a size change has been done above.
1088 * Otherwise, we could get into problems with truncate as
1089 * ip_alloc_sem is used there to protect against i_size
1090 * changes.
1091 */
ccd979bd
MF
1092 status = inode_setattr(inode, attr);
1093 if (status < 0) {
1094 mlog_errno(status);
1095 goto bail_commit;
1096 }
1097
1098 status = ocfs2_mark_inode_dirty(handle, inode, bh);
1099 if (status < 0)
1100 mlog_errno(status);
1101
1102bail_commit:
02dc1af4 1103 ocfs2_commit_trans(osb, handle);
ccd979bd
MF
1104bail_unlock:
1105 ocfs2_meta_unlock(inode, 1);
1106bail_unlock_rw:
1107 if (size_change)
1108 ocfs2_rw_unlock(inode, 1);
1109bail:
1110 if (bh)
1111 brelse(bh);
1112
1113 mlog_exit(status);
1114 return status;
1115}
1116
1117int ocfs2_getattr(struct vfsmount *mnt,
1118 struct dentry *dentry,
1119 struct kstat *stat)
1120{
1121 struct inode *inode = dentry->d_inode;
1122 struct super_block *sb = dentry->d_inode->i_sb;
1123 struct ocfs2_super *osb = sb->s_fs_info;
1124 int err;
1125
1126 mlog_entry_void();
1127
1128 err = ocfs2_inode_revalidate(dentry);
1129 if (err) {
1130 if (err != -ENOENT)
1131 mlog_errno(err);
1132 goto bail;
1133 }
1134
1135 generic_fillattr(inode, stat);
1136
1137 /* We set the blksize from the cluster size for performance */
1138 stat->blksize = osb->s_clustersize;
1139
1140bail:
1141 mlog_exit(err);
1142
1143 return err;
1144}
1145
d38eb8db
TY
1146int ocfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
1147{
1148 int ret;
1149
1150 mlog_entry_void();
1151
1152 ret = ocfs2_meta_lock(inode, NULL, 0);
1153 if (ret) {
a9f5f707
MF
1154 if (ret != -ENOENT)
1155 mlog_errno(ret);
d38eb8db
TY
1156 goto out;
1157 }
1158
1159 ret = generic_permission(inode, mask, NULL);
d38eb8db
TY
1160
1161 ocfs2_meta_unlock(inode, 0);
1162out:
1163 mlog_exit(ret);
1164 return ret;
1165}
1166
b2580103
MF
1167static int __ocfs2_write_remove_suid(struct inode *inode,
1168 struct buffer_head *bh)
ccd979bd
MF
1169{
1170 int ret;
1fabe148 1171 handle_t *handle;
ccd979bd
MF
1172 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1173 struct ocfs2_dinode *di;
1174
b0697053 1175 mlog_entry("(Inode %llu, mode 0%o)\n",
b2580103 1176 (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
ccd979bd 1177
65eff9cc 1178 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
ccd979bd
MF
1179 if (handle == NULL) {
1180 ret = -ENOMEM;
1181 mlog_errno(ret);
1182 goto out;
1183 }
1184
ccd979bd
MF
1185 ret = ocfs2_journal_access(handle, inode, bh,
1186 OCFS2_JOURNAL_ACCESS_WRITE);
1187 if (ret < 0) {
1188 mlog_errno(ret);
b2580103 1189 goto out_trans;
ccd979bd
MF
1190 }
1191
1192 inode->i_mode &= ~S_ISUID;
1193 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1194 inode->i_mode &= ~S_ISGID;
1195
1196 di = (struct ocfs2_dinode *) bh->b_data;
1197 di->i_mode = cpu_to_le16(inode->i_mode);
1198
1199 ret = ocfs2_journal_dirty(handle, bh);
1200 if (ret < 0)
1201 mlog_errno(ret);
b2580103 1202
ccd979bd 1203out_trans:
02dc1af4 1204 ocfs2_commit_trans(osb, handle);
ccd979bd
MF
1205out:
1206 mlog_exit(ret);
1207 return ret;
1208}
1209
9517bac6
MF
1210/*
1211 * Will look for holes and unwritten extents in the range starting at
1212 * pos for count bytes (inclusive).
1213 */
1214static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1215 size_t count)
1216{
1217 int ret = 0;
49cb8d2d 1218 unsigned int extent_flags;
9517bac6
MF
1219 u32 cpos, clusters, extent_len, phys_cpos;
1220 struct super_block *sb = inode->i_sb;
1221
1222 cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1223 clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1224
1225 while (clusters) {
49cb8d2d
MF
1226 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1227 &extent_flags);
9517bac6
MF
1228 if (ret < 0) {
1229 mlog_errno(ret);
1230 goto out;
1231 }
1232
49cb8d2d 1233 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
9517bac6
MF
1234 ret = 1;
1235 break;
1236 }
1237
1238 if (extent_len > clusters)
1239 extent_len = clusters;
1240
1241 clusters -= extent_len;
1242 cpos += extent_len;
1243 }
1244out:
1245 return ret;
1246}
1247
b2580103
MF
1248static int ocfs2_write_remove_suid(struct inode *inode)
1249{
1250 int ret;
1251 struct buffer_head *bh = NULL;
1252 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1253
1254 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1255 oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
1256 if (ret < 0) {
1257 mlog_errno(ret);
1258 goto out;
1259 }
1260
1261 ret = __ocfs2_write_remove_suid(inode, bh);
1262out:
1263 brelse(bh);
1264 return ret;
1265}
1266
2ae99a60
MF
1267/*
1268 * Allocate enough extents to cover the region starting at byte offset
1269 * start for len bytes. Existing extents are skipped, any extents
1270 * added are marked as "unwritten".
1271 */
1272static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1273 u64 start, u64 len)
1274{
1275 int ret;
1276 u32 cpos, phys_cpos, clusters, alloc_size;
1afc32b9
MF
1277 u64 end = start + len;
1278 struct buffer_head *di_bh = NULL;
1279
1280 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1281 ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1282 OCFS2_I(inode)->ip_blkno, &di_bh,
1283 OCFS2_BH_CACHED, inode);
1284 if (ret) {
1285 mlog_errno(ret);
1286 goto out;
1287 }
1288
1289 /*
1290 * Nothing to do if the requested reservation range
1291 * fits within the inode.
1292 */
1293 if (ocfs2_size_fits_inline_data(di_bh, end))
1294 goto out;
1295
1296 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1297 if (ret) {
1298 mlog_errno(ret);
1299 goto out;
1300 }
1301 }
2ae99a60
MF
1302
1303 /*
1304 * We consider both start and len to be inclusive.
1305 */
1306 cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1307 clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1308 clusters -= cpos;
1309
1310 while (clusters) {
1311 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1312 &alloc_size, NULL);
1313 if (ret) {
1314 mlog_errno(ret);
1315 goto out;
1316 }
1317
1318 /*
1319 * Hole or existing extent len can be arbitrary, so
1320 * cap it to our own allocation request.
1321 */
1322 if (alloc_size > clusters)
1323 alloc_size = clusters;
1324
1325 if (phys_cpos) {
1326 /*
1327 * We already have an allocation at this
1328 * region so we can safely skip it.
1329 */
1330 goto next;
1331 }
1332
1333 ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1334 if (ret) {
1335 if (ret != -ENOSPC)
1336 mlog_errno(ret);
1337 goto out;
1338 }
1339
1340next:
1341 cpos += alloc_size;
1342 clusters -= alloc_size;
1343 }
1344
1345 ret = 0;
1346out:
1afc32b9
MF
1347
1348 brelse(di_bh);
2ae99a60
MF
1349 return ret;
1350}
1351
063c4561
MF
1352static int __ocfs2_remove_inode_range(struct inode *inode,
1353 struct buffer_head *di_bh,
1354 u32 cpos, u32 phys_cpos, u32 len,
1355 struct ocfs2_cached_dealloc_ctxt *dealloc)
1356{
1357 int ret;
1358 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
1359 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1360 struct inode *tl_inode = osb->osb_tl_inode;
1361 handle_t *handle;
1362 struct ocfs2_alloc_context *meta_ac = NULL;
1363 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1364
1365 ret = ocfs2_lock_allocators(inode, di, 0, 1, NULL, &meta_ac);
1366 if (ret) {
1367 mlog_errno(ret);
1368 return ret;
1369 }
1370
1371 mutex_lock(&tl_inode->i_mutex);
1372
1373 if (ocfs2_truncate_log_needs_flush(osb)) {
1374 ret = __ocfs2_flush_truncate_log(osb);
1375 if (ret < 0) {
1376 mlog_errno(ret);
1377 goto out;
1378 }
1379 }
1380
1381 handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
1382 if (handle == NULL) {
1383 ret = -ENOMEM;
1384 mlog_errno(ret);
1385 goto out;
1386 }
1387
1388 ret = ocfs2_journal_access(handle, inode, di_bh,
1389 OCFS2_JOURNAL_ACCESS_WRITE);
1390 if (ret) {
1391 mlog_errno(ret);
1392 goto out;
1393 }
1394
1395 ret = ocfs2_remove_extent(inode, di_bh, cpos, len, handle, meta_ac,
1396 dealloc);
1397 if (ret) {
1398 mlog_errno(ret);
1399 goto out_commit;
1400 }
1401
1402 OCFS2_I(inode)->ip_clusters -= len;
1403 di->i_clusters = cpu_to_le32(OCFS2_I(inode)->ip_clusters);
1404
1405 ret = ocfs2_journal_dirty(handle, di_bh);
1406 if (ret) {
1407 mlog_errno(ret);
1408 goto out_commit;
1409 }
1410
1411 ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
1412 if (ret)
1413 mlog_errno(ret);
1414
1415out_commit:
1416 ocfs2_commit_trans(osb, handle);
1417out:
1418 mutex_unlock(&tl_inode->i_mutex);
1419
1420 if (meta_ac)
1421 ocfs2_free_alloc_context(meta_ac);
1422
1423 return ret;
1424}
1425
1426/*
1427 * Truncate a byte range, avoiding pages within partial clusters. This
1428 * preserves those pages for the zeroing code to write to.
1429 */
1430static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1431 u64 byte_len)
1432{
1433 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1434 loff_t start, end;
1435 struct address_space *mapping = inode->i_mapping;
1436
1437 start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1438 end = byte_start + byte_len;
1439 end = end & ~(osb->s_clustersize - 1);
1440
1441 if (start < end) {
1442 unmap_mapping_range(mapping, start, end - start, 0);
1443 truncate_inode_pages_range(mapping, start, end - 1);
1444 }
1445}
1446
1447static int ocfs2_zero_partial_clusters(struct inode *inode,
1448 u64 start, u64 len)
1449{
1450 int ret = 0;
1451 u64 tmpend, end = start + len;
1452 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1453 unsigned int csize = osb->s_clustersize;
1454 handle_t *handle;
1455
1456 /*
1457 * The "start" and "end" values are NOT necessarily part of
1458 * the range whose allocation is being deleted. Rather, this
1459 * is what the user passed in with the request. We must zero
1460 * partial clusters here. There's no need to worry about
1461 * physical allocation - the zeroing code knows to skip holes.
1462 */
1463 mlog(0, "byte start: %llu, end: %llu\n",
1464 (unsigned long long)start, (unsigned long long)end);
1465
1466 /*
1467 * If both edges are on a cluster boundary then there's no
1468 * zeroing required as the region is part of the allocation to
1469 * be truncated.
1470 */
1471 if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1472 goto out;
1473
1474 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1475 if (handle == NULL) {
1476 ret = -ENOMEM;
1477 mlog_errno(ret);
1478 goto out;
1479 }
1480
1481 /*
1482 * We want to get the byte offset of the end of the 1st cluster.
1483 */
1484 tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1485 if (tmpend > end)
1486 tmpend = end;
1487
1488 mlog(0, "1st range: start: %llu, tmpend: %llu\n",
1489 (unsigned long long)start, (unsigned long long)tmpend);
1490
1491 ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1492 if (ret)
1493 mlog_errno(ret);
1494
1495 if (tmpend < end) {
1496 /*
1497 * This may make start and end equal, but the zeroing
1498 * code will skip any work in that case so there's no
1499 * need to catch it up here.
1500 */
1501 start = end & ~(osb->s_clustersize - 1);
1502
1503 mlog(0, "2nd range: start: %llu, end: %llu\n",
1504 (unsigned long long)start, (unsigned long long)end);
1505
1506 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1507 if (ret)
1508 mlog_errno(ret);
1509 }
1510
1511 ocfs2_commit_trans(osb, handle);
1512out:
1513 return ret;
1514}
1515
1516static int ocfs2_remove_inode_range(struct inode *inode,
1517 struct buffer_head *di_bh, u64 byte_start,
1518 u64 byte_len)
1519{
1520 int ret = 0;
1521 u32 trunc_start, trunc_len, cpos, phys_cpos, alloc_size;
1522 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1523 struct ocfs2_cached_dealloc_ctxt dealloc;
1524
1525 ocfs2_init_dealloc_ctxt(&dealloc);
1526
1527 if (byte_len == 0)
1528 return 0;
1529
1afc32b9
MF
1530 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1531 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1532 byte_start + byte_len, 1);
1533 if (ret)
1534 mlog_errno(ret);
1535 return ret;
1536 }
1537
063c4561
MF
1538 trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1539 trunc_len = (byte_start + byte_len) >> osb->s_clustersize_bits;
1540 if (trunc_len >= trunc_start)
1541 trunc_len -= trunc_start;
1542 else
1543 trunc_len = 0;
1544
1545 mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u\n",
1546 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1547 (unsigned long long)byte_start,
1548 (unsigned long long)byte_len, trunc_start, trunc_len);
1549
1550 ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1551 if (ret) {
1552 mlog_errno(ret);
1553 goto out;
1554 }
1555
1556 cpos = trunc_start;
1557 while (trunc_len) {
1558 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1559 &alloc_size, NULL);
1560 if (ret) {
1561 mlog_errno(ret);
1562 goto out;
1563 }
1564
1565 if (alloc_size > trunc_len)
1566 alloc_size = trunc_len;
1567
1568 /* Only do work for non-holes */
1569 if (phys_cpos != 0) {
1570 ret = __ocfs2_remove_inode_range(inode, di_bh, cpos,
1571 phys_cpos, alloc_size,
1572 &dealloc);
1573 if (ret) {
1574 mlog_errno(ret);
1575 goto out;
1576 }
1577 }
1578
1579 cpos += alloc_size;
1580 trunc_len -= alloc_size;
1581 }
1582
1583 ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1584
1585out:
1586 ocfs2_schedule_truncate_log_flush(osb, 1);
1587 ocfs2_run_deallocs(osb, &dealloc);
1588
1589 return ret;
1590}
1591
b2580103
MF
1592/*
1593 * Parts of this function taken from xfs_change_file_space()
1594 */
385820a3
MF
1595static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1596 loff_t f_pos, unsigned int cmd,
1597 struct ocfs2_space_resv *sr,
1598 int change_size)
b2580103
MF
1599{
1600 int ret;
1601 s64 llen;
385820a3 1602 loff_t size;
b2580103
MF
1603 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1604 struct buffer_head *di_bh = NULL;
1605 handle_t *handle;
a00cce35 1606 unsigned long long max_off = inode->i_sb->s_maxbytes;
b2580103 1607
b2580103
MF
1608 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1609 return -EROFS;
1610
1611 mutex_lock(&inode->i_mutex);
1612
1613 /*
1614 * This prevents concurrent writes on other nodes
1615 */
1616 ret = ocfs2_rw_lock(inode, 1);
1617 if (ret) {
1618 mlog_errno(ret);
1619 goto out;
1620 }
1621
1622 ret = ocfs2_meta_lock(inode, &di_bh, 1);
1623 if (ret) {
1624 mlog_errno(ret);
1625 goto out_rw_unlock;
1626 }
1627
1628 if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1629 ret = -EPERM;
1630 goto out_meta_unlock;
1631 }
1632
1633 switch (sr->l_whence) {
1634 case 0: /*SEEK_SET*/
1635 break;
1636 case 1: /*SEEK_CUR*/
385820a3 1637 sr->l_start += f_pos;
b2580103
MF
1638 break;
1639 case 2: /*SEEK_END*/
1640 sr->l_start += i_size_read(inode);
1641 break;
1642 default:
1643 ret = -EINVAL;
1644 goto out_meta_unlock;
1645 }
1646 sr->l_whence = 0;
1647
1648 llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1649
1650 if (sr->l_start < 0
1651 || sr->l_start > max_off
1652 || (sr->l_start + llen) < 0
1653 || (sr->l_start + llen) > max_off) {
1654 ret = -EINVAL;
1655 goto out_meta_unlock;
1656 }
385820a3 1657 size = sr->l_start + sr->l_len;
b2580103
MF
1658
1659 if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
1660 if (sr->l_len <= 0) {
1661 ret = -EINVAL;
1662 goto out_meta_unlock;
1663 }
1664 }
1665
385820a3 1666 if (file && should_remove_suid(file->f_path.dentry)) {
b2580103
MF
1667 ret = __ocfs2_write_remove_suid(inode, di_bh);
1668 if (ret) {
1669 mlog_errno(ret);
1670 goto out_meta_unlock;
1671 }
1672 }
1673
1674 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1675 switch (cmd) {
1676 case OCFS2_IOC_RESVSP:
1677 case OCFS2_IOC_RESVSP64:
1678 /*
1679 * This takes unsigned offsets, but the signed ones we
1680 * pass have been checked against overflow above.
1681 */
1682 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1683 sr->l_len);
1684 break;
1685 case OCFS2_IOC_UNRESVSP:
1686 case OCFS2_IOC_UNRESVSP64:
1687 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1688 sr->l_len);
1689 break;
1690 default:
1691 ret = -EINVAL;
1692 }
1693 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1694 if (ret) {
1695 mlog_errno(ret);
1696 goto out_meta_unlock;
1697 }
1698
1699 /*
1700 * We update c/mtime for these changes
1701 */
1702 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1703 if (IS_ERR(handle)) {
1704 ret = PTR_ERR(handle);
1705 mlog_errno(ret);
1706 goto out_meta_unlock;
1707 }
1708
385820a3
MF
1709 if (change_size && i_size_read(inode) < size)
1710 i_size_write(inode, size);
1711
b2580103
MF
1712 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1713 ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1714 if (ret < 0)
1715 mlog_errno(ret);
1716
1717 ocfs2_commit_trans(osb, handle);
1718
1719out_meta_unlock:
1720 brelse(di_bh);
1721 ocfs2_meta_unlock(inode, 1);
1722out_rw_unlock:
1723 ocfs2_rw_unlock(inode, 1);
1724
1725 mutex_unlock(&inode->i_mutex);
1726out:
1727 return ret;
1728}
1729
385820a3
MF
1730int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1731 struct ocfs2_space_resv *sr)
1732{
1733 struct inode *inode = file->f_path.dentry->d_inode;
1734 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);;
1735
1736 if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1737 !ocfs2_writes_unwritten_extents(osb))
1738 return -ENOTTY;
1739 else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1740 !ocfs2_sparse_alloc(osb))
1741 return -ENOTTY;
1742
1743 if (!S_ISREG(inode->i_mode))
1744 return -EINVAL;
1745
1746 if (!(file->f_mode & FMODE_WRITE))
1747 return -EBADF;
1748
1749 return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1750}
1751
1752static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset,
1753 loff_t len)
1754{
1755 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1756 struct ocfs2_space_resv sr;
1757 int change_size = 1;
1758
1759 if (!ocfs2_writes_unwritten_extents(osb))
1760 return -EOPNOTSUPP;
1761
1762 if (S_ISDIR(inode->i_mode))
1763 return -ENODEV;
1764
1765 if (mode & FALLOC_FL_KEEP_SIZE)
1766 change_size = 0;
1767
1768 sr.l_whence = 0;
1769 sr.l_start = (s64)offset;
1770 sr.l_len = (s64)len;
1771
1772 return __ocfs2_change_file_space(NULL, inode, offset,
1773 OCFS2_IOC_RESVSP64, &sr, change_size);
1774}
1775
8659ac25
TY
1776static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
1777 loff_t *ppos,
1778 size_t count,
9517bac6
MF
1779 int appending,
1780 int *direct_io)
ccd979bd 1781{
65ed39d6 1782 int ret = 0, meta_level = 0;
8659ac25 1783 struct inode *inode = dentry->d_inode;
65ed39d6 1784 loff_t saved_pos, end;
ccd979bd 1785
ccd979bd 1786 /*
65ed39d6
MF
1787 * We start with a read level meta lock and only jump to an ex
1788 * if we need to make modifications here.
ccd979bd 1789 */
ccd979bd 1790 for(;;) {
4bcec184 1791 ret = ocfs2_meta_lock(inode, NULL, meta_level);
ccd979bd
MF
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. */
8659ac25 1807 if (should_remove_suid(dentry)) {
ccd979bd
MF
1808 if (meta_level == 0) {
1809 ocfs2_meta_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);
8659ac25 1817 goto out_unlock;
ccd979bd
MF
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. */
8659ac25 1823 if (appending) {
ccd979bd
MF
1824 saved_pos = i_size_read(inode);
1825 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
1826 } else {
8659ac25 1827 saved_pos = *ppos;
ccd979bd 1828 }
3a0782d0 1829
65ed39d6 1830 end = saved_pos + count;
9517bac6 1831
65ed39d6
MF
1832 /*
1833 * Skip the O_DIRECT checks if we don't need
1834 * them.
1835 */
1836 if (!direct_io || !(*direct_io))
9517bac6 1837 break;
9517bac6 1838
1afc32b9
MF
1839 /*
1840 * There's no sane way to do direct writes to an inode
1841 * with inline data.
1842 */
1843 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1844 *direct_io = 0;
1845 break;
1846 }
1847
3a0782d0 1848 /*
65ed39d6
MF
1849 * Allowing concurrent direct writes means
1850 * i_size changes wouldn't be synchronized, so
1851 * one node could wind up truncating another
1852 * nodes writes.
3a0782d0 1853 */
65ed39d6
MF
1854 if (end > i_size_read(inode)) {
1855 *direct_io = 0;
ccd979bd 1856 break;
ccd979bd
MF
1857 }
1858
65ed39d6
MF
1859 /*
1860 * We don't fill holes during direct io, so
1861 * check for them here. If any are found, the
1862 * caller will have to retake some cluster
1863 * locks and initiate the io as buffered.
1864 */
1865 ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
1866 if (ret == 1) {
1867 *direct_io = 0;
1868 ret = 0;
1869 } else if (ret < 0)
1870 mlog_errno(ret);
ccd979bd
MF
1871 break;
1872 }
1873
8659ac25
TY
1874 if (appending)
1875 *ppos = saved_pos;
1876
1877out_unlock:
ccd979bd 1878 ocfs2_meta_unlock(inode, meta_level);
8659ac25
TY
1879
1880out:
1881 return ret;
1882}
1883
1884static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
1885 const struct iovec *iov,
1886 unsigned long nr_segs,
1887 loff_t pos)
1888{
9517bac6 1889 int ret, direct_io, appending, rw_level, have_alloc_sem = 0;
b6af1bcd 1890 int can_do_direct;
9517bac6
MF
1891 ssize_t written = 0;
1892 size_t ocount; /* original count */
1893 size_t count; /* after file limit checks */
1894 loff_t *ppos = &iocb->ki_pos;
1895 struct file *file = iocb->ki_filp;
1896 struct inode *inode = file->f_path.dentry->d_inode;
1897
1898 mlog_entry("(0x%p, %u, '%.*s')\n", file,
8659ac25 1899 (unsigned int)nr_segs,
9517bac6
MF
1900 file->f_path.dentry->d_name.len,
1901 file->f_path.dentry->d_name.name);
8659ac25 1902
8659ac25
TY
1903 if (iocb->ki_left == 0)
1904 return 0;
1905
9517bac6
MF
1906 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
1907
1908 appending = file->f_flags & O_APPEND ? 1 : 0;
1909 direct_io = file->f_flags & O_DIRECT ? 1 : 0;
1910
8659ac25 1911 mutex_lock(&inode->i_mutex);
9517bac6
MF
1912
1913relock:
8659ac25 1914 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
9517bac6 1915 if (direct_io) {
8659ac25 1916 down_read(&inode->i_alloc_sem);
9517bac6 1917 have_alloc_sem = 1;
8659ac25
TY
1918 }
1919
1920 /* concurrent O_DIRECT writes are allowed */
9517bac6 1921 rw_level = !direct_io;
8659ac25
TY
1922 ret = ocfs2_rw_lock(inode, rw_level);
1923 if (ret < 0) {
8659ac25 1924 mlog_errno(ret);
9517bac6 1925 goto out_sems;
8659ac25
TY
1926 }
1927
9517bac6
MF
1928 can_do_direct = direct_io;
1929 ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos,
1930 iocb->ki_left, appending,
1931 &can_do_direct);
8659ac25
TY
1932 if (ret < 0) {
1933 mlog_errno(ret);
1934 goto out;
1935 }
ccd979bd 1936
9517bac6
MF
1937 /*
1938 * We can't complete the direct I/O as requested, fall back to
1939 * buffered I/O.
1940 */
1941 if (direct_io && !can_do_direct) {
1942 ocfs2_rw_unlock(inode, rw_level);
1943 up_read(&inode->i_alloc_sem);
1944
1945 have_alloc_sem = 0;
1946 rw_level = -1;
1947
1948 direct_io = 0;
9517bac6
MF
1949 goto relock;
1950 }
1951
ccd979bd 1952 /* communicate with ocfs2_dio_end_io */
7cdfc3a1 1953 ocfs2_iocb_set_rw_locked(iocb, rw_level);
ccd979bd 1954
9517bac6 1955 if (direct_io) {
b6af1bcd
NP
1956 ret = generic_segment_checks(iov, &nr_segs, &ocount,
1957 VERIFY_READ);
1958 if (ret)
1959 goto out_dio;
1960
1961 ret = generic_write_checks(file, ppos, &count,
1962 S_ISBLK(inode->i_mode));
1963 if (ret)
1964 goto out_dio;
1965
9517bac6
MF
1966 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
1967 ppos, count, ocount);
1968 if (written < 0) {
1969 ret = written;
1970 goto out_dio;
1971 }
1972 } else {
b6af1bcd
NP
1973 written = generic_file_aio_write_nolock(iocb, iov, nr_segs,
1974 *ppos);
9517bac6 1975 }
ccd979bd 1976
9517bac6 1977out_dio:
ccd979bd 1978 /* buffered aio wouldn't have proper lock coverage today */
9517bac6 1979 BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
ccd979bd
MF
1980
1981 /*
1982 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
1983 * function pointer which is called when o_direct io completes so that
1984 * it can unlock our rw lock. (it's the clustered equivalent of
1985 * i_alloc_sem; protects truncate from racing with pending ios).
1986 * Unfortunately there are error cases which call end_io and others
1987 * that don't. so we don't have to unlock the rw_lock if either an
1988 * async dio is going to do it in the future or an end_io after an
1989 * error has already done it.
1990 */
1991 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1992 rw_level = -1;
1993 have_alloc_sem = 0;
1994 }
1995
1996out:
9517bac6
MF
1997 if (rw_level != -1)
1998 ocfs2_rw_unlock(inode, rw_level);
1999
2000out_sems:
ccd979bd
MF
2001 if (have_alloc_sem)
2002 up_read(&inode->i_alloc_sem);
9517bac6 2003
1b1dcc1b 2004 mutex_unlock(&inode->i_mutex);
ccd979bd
MF
2005
2006 mlog_exit(ret);
9517bac6 2007 return written ? written : ret;
ccd979bd
MF
2008}
2009
8659ac25
TY
2010static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2011 struct file *out,
2012 loff_t *ppos,
2013 size_t len,
2014 unsigned int flags)
2015{
2016 int ret;
d28c9174 2017 struct inode *inode = out->f_path.dentry->d_inode;
8659ac25
TY
2018
2019 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
2020 (unsigned int)len,
d28c9174
JS
2021 out->f_path.dentry->d_name.len,
2022 out->f_path.dentry->d_name.name);
8659ac25
TY
2023
2024 inode_double_lock(inode, pipe->inode);
2025
2026 ret = ocfs2_rw_lock(inode, 1);
2027 if (ret < 0) {
2028 mlog_errno(ret);
2029 goto out;
2030 }
2031
9517bac6
MF
2032 ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, ppos, len, 0,
2033 NULL);
8659ac25
TY
2034 if (ret < 0) {
2035 mlog_errno(ret);
2036 goto out_unlock;
2037 }
2038
b6af1bcd 2039 ret = generic_file_splice_write_nolock(pipe, out, ppos, len, flags);
8659ac25
TY
2040
2041out_unlock:
2042 ocfs2_rw_unlock(inode, 1);
2043out:
2044 inode_double_unlock(inode, pipe->inode);
2045
2046 mlog_exit(ret);
2047 return ret;
2048}
2049
2050static ssize_t ocfs2_file_splice_read(struct file *in,
2051 loff_t *ppos,
2052 struct pipe_inode_info *pipe,
2053 size_t len,
2054 unsigned int flags)
2055{
2056 int ret = 0;
d28c9174 2057 struct inode *inode = in->f_path.dentry->d_inode;
8659ac25
TY
2058
2059 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
2060 (unsigned int)len,
d28c9174
JS
2061 in->f_path.dentry->d_name.len,
2062 in->f_path.dentry->d_name.name);
8659ac25
TY
2063
2064 /*
2065 * See the comment in ocfs2_file_aio_read()
2066 */
2067 ret = ocfs2_meta_lock(inode, NULL, 0);
2068 if (ret < 0) {
2069 mlog_errno(ret);
2070 goto bail;
2071 }
2072 ocfs2_meta_unlock(inode, 0);
2073
2074 ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2075
2076bail:
2077 mlog_exit(ret);
2078 return ret;
2079}
2080
ccd979bd 2081static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
027445c3
BP
2082 const struct iovec *iov,
2083 unsigned long nr_segs,
ccd979bd
MF
2084 loff_t pos)
2085{
25899dee 2086 int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
ccd979bd 2087 struct file *filp = iocb->ki_filp;
d28c9174 2088 struct inode *inode = filp->f_path.dentry->d_inode;
ccd979bd 2089
027445c3
BP
2090 mlog_entry("(0x%p, %u, '%.*s')\n", filp,
2091 (unsigned int)nr_segs,
d28c9174
JS
2092 filp->f_path.dentry->d_name.len,
2093 filp->f_path.dentry->d_name.name);
ccd979bd
MF
2094
2095 if (!inode) {
2096 ret = -EINVAL;
2097 mlog_errno(ret);
2098 goto bail;
2099 }
2100
ccd979bd
MF
2101 /*
2102 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
2103 * need locks to protect pending reads from racing with truncate.
2104 */
2105 if (filp->f_flags & O_DIRECT) {
2106 down_read(&inode->i_alloc_sem);
2107 have_alloc_sem = 1;
2108
2109 ret = ocfs2_rw_lock(inode, 0);
2110 if (ret < 0) {
2111 mlog_errno(ret);
2112 goto bail;
2113 }
2114 rw_level = 0;
2115 /* communicate with ocfs2_dio_end_io */
7cdfc3a1 2116 ocfs2_iocb_set_rw_locked(iocb, rw_level);
ccd979bd
MF
2117 }
2118
c4374f8a
MF
2119 /*
2120 * We're fine letting folks race truncates and extending
2121 * writes with read across the cluster, just like they can
2122 * locally. Hence no rw_lock during read.
2123 *
2124 * Take and drop the meta data lock to update inode fields
2125 * like i_size. This allows the checks down below
2126 * generic_file_aio_read() a chance of actually working.
2127 */
25899dee 2128 ret = ocfs2_meta_lock_atime(inode, filp->f_vfsmnt, &lock_level);
c4374f8a
MF
2129 if (ret < 0) {
2130 mlog_errno(ret);
2131 goto bail;
2132 }
25899dee 2133 ocfs2_meta_unlock(inode, lock_level);
c4374f8a 2134
027445c3 2135 ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
ccd979bd
MF
2136 if (ret == -EINVAL)
2137 mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n");
2138
2139 /* buffered aio wouldn't have proper lock coverage today */
2140 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2141
2142 /* see ocfs2_file_aio_write */
2143 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2144 rw_level = -1;
2145 have_alloc_sem = 0;
2146 }
2147
2148bail:
2149 if (have_alloc_sem)
2150 up_read(&inode->i_alloc_sem);
2151 if (rw_level != -1)
2152 ocfs2_rw_unlock(inode, rw_level);
2153 mlog_exit(ret);
2154
2155 return ret;
2156}
2157
92e1d5be 2158const struct inode_operations ocfs2_file_iops = {
ccd979bd
MF
2159 .setattr = ocfs2_setattr,
2160 .getattr = ocfs2_getattr,
d38eb8db 2161 .permission = ocfs2_permission,
385820a3 2162 .fallocate = ocfs2_fallocate,
ccd979bd
MF
2163};
2164
92e1d5be 2165const struct inode_operations ocfs2_special_file_iops = {
ccd979bd
MF
2166 .setattr = ocfs2_setattr,
2167 .getattr = ocfs2_getattr,
d38eb8db 2168 .permission = ocfs2_permission,
ccd979bd
MF
2169};
2170
4b6f5d20 2171const struct file_operations ocfs2_fops = {
ccd979bd
MF
2172 .read = do_sync_read,
2173 .write = do_sync_write,
ccd979bd
MF
2174 .mmap = ocfs2_mmap,
2175 .fsync = ocfs2_sync_file,
2176 .release = ocfs2_file_release,
2177 .open = ocfs2_file_open,
2178 .aio_read = ocfs2_file_aio_read,
2179 .aio_write = ocfs2_file_aio_write,
ca4d147e 2180 .ioctl = ocfs2_ioctl,
586d232b
MF
2181#ifdef CONFIG_COMPAT
2182 .compat_ioctl = ocfs2_compat_ioctl,
2183#endif
8659ac25
TY
2184 .splice_read = ocfs2_file_splice_read,
2185 .splice_write = ocfs2_file_splice_write,
ccd979bd
MF
2186};
2187
4b6f5d20 2188const struct file_operations ocfs2_dops = {
ccd979bd
MF
2189 .read = generic_read_dir,
2190 .readdir = ocfs2_readdir,
2191 .fsync = ocfs2_sync_file,
ca4d147e 2192 .ioctl = ocfs2_ioctl,
586d232b
MF
2193#ifdef CONFIG_COMPAT
2194 .compat_ioctl = ocfs2_compat_ioctl,
2195#endif
ccd979bd 2196};