blob: 9395b4fa547df54a5dcce659d779ac718377b053 [file] [log] [blame]
Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- 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
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080026#include <linux/capability.h>
Mark Fashehccd979b2005-12-15 14:31:24 -080027#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>
Mark Fashehe2057c52006-10-03 17:53:05 -070033#include <linux/sched.h>
Tiger Yang8659ac22006-10-17 18:29:52 -070034#include <linux/pipe_fs_i.h>
Tiger Yang7f1a37e2006-11-15 15:48:42 +080035#include <linux/mount.h>
Mark Fasheh9517bac2007-02-09 20:24:12 -080036#include <linux/writeback.h>
Mark Fashehccd979b2005-12-15 14:31:24 -080037
38#define MLOG_MASK_PREFIX ML_INODE
39#include <cluster/masklog.h>
40
41#include "ocfs2.h"
42
43#include "alloc.h"
44#include "aops.h"
45#include "dir.h"
46#include "dlmglue.h"
47#include "extent_map.h"
48#include "file.h"
49#include "sysfile.h"
50#include "inode.h"
Herbert Poetzlca4d1472006-07-03 17:27:12 -070051#include "ioctl.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080052#include "journal.h"
53#include "mmap.h"
54#include "suballoc.h"
55#include "super.h"
56
57#include "buffer_head_io.h"
58
59static int ocfs2_sync_inode(struct inode *inode)
60{
61 filemap_fdatawrite(inode->i_mapping);
62 return sync_mapping_buffers(inode->i_mapping);
63}
64
65static int ocfs2_file_open(struct inode *inode, struct file *file)
66{
67 int status;
68 int mode = file->f_flags;
69 struct ocfs2_inode_info *oi = OCFS2_I(inode);
70
71 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
Josef Sipekd28c9172006-12-08 02:37:25 -080072 file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name);
Mark Fashehccd979b2005-12-15 14:31:24 -080073
74 spin_lock(&oi->ip_lock);
75
76 /* Check that the inode hasn't been wiped from disk by another
77 * node. If it hasn't then we're safe as long as we hold the
78 * spin lock until our increment of open count. */
79 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
80 spin_unlock(&oi->ip_lock);
81
82 status = -ENOENT;
83 goto leave;
84 }
85
86 if (mode & O_DIRECT)
87 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
88
89 oi->ip_open_count++;
90 spin_unlock(&oi->ip_lock);
91 status = 0;
92leave:
93 mlog_exit(status);
94 return status;
95}
96
97static int ocfs2_file_release(struct inode *inode, struct file *file)
98{
99 struct ocfs2_inode_info *oi = OCFS2_I(inode);
100
101 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
Josef Sipekd28c9172006-12-08 02:37:25 -0800102 file->f_path.dentry->d_name.len,
103 file->f_path.dentry->d_name.name);
Mark Fashehccd979b2005-12-15 14:31:24 -0800104
105 spin_lock(&oi->ip_lock);
106 if (!--oi->ip_open_count)
107 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
108 spin_unlock(&oi->ip_lock);
109
110 mlog_exit(0);
111
112 return 0;
113}
114
115static int ocfs2_sync_file(struct file *file,
116 struct dentry *dentry,
117 int datasync)
118{
119 int err = 0;
120 journal_t *journal;
121 struct inode *inode = dentry->d_inode;
122 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
123
124 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync,
125 dentry->d_name.len, dentry->d_name.name);
126
127 err = ocfs2_sync_inode(dentry->d_inode);
128 if (err)
129 goto bail;
130
131 journal = osb->journal->j_journal;
132 err = journal_force_commit(journal);
133
134bail:
135 mlog_exit(err);
136
137 return (err < 0) ? -EIO : 0;
138}
139
Tiger Yang7f1a37e2006-11-15 15:48:42 +0800140int ocfs2_should_update_atime(struct inode *inode,
141 struct vfsmount *vfsmnt)
142{
143 struct timespec now;
144 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
145
146 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
147 return 0;
148
149 if ((inode->i_flags & S_NOATIME) ||
150 ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
151 return 0;
152
Mark Fasheh6c2aad02006-12-19 15:25:52 -0800153 /*
154 * We can be called with no vfsmnt structure - NFSD will
155 * sometimes do this.
156 *
157 * Note that our action here is different than touch_atime() -
158 * if we can't tell whether this is a noatime mount, then we
159 * don't know whether to trust the value of s_atime_quantum.
160 */
161 if (vfsmnt == NULL)
162 return 0;
163
Tiger Yang7f1a37e2006-11-15 15:48:42 +0800164 if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
165 ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
166 return 0;
167
Mark Fasheh7e913c52006-12-13 00:34:35 -0800168 if (vfsmnt->mnt_flags & MNT_RELATIME) {
169 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
170 (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
171 return 1;
172
173 return 0;
174 }
175
Tiger Yang7f1a37e2006-11-15 15:48:42 +0800176 now = CURRENT_TIME;
177 if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
178 return 0;
179 else
180 return 1;
181}
182
183int ocfs2_update_inode_atime(struct inode *inode,
184 struct buffer_head *bh)
185{
186 int ret;
187 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
188 handle_t *handle;
189
190 mlog_entry_void();
191
192 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
193 if (handle == NULL) {
194 ret = -ENOMEM;
195 mlog_errno(ret);
196 goto out;
197 }
198
199 inode->i_atime = CURRENT_TIME;
200 ret = ocfs2_mark_inode_dirty(handle, inode, bh);
201 if (ret < 0)
202 mlog_errno(ret);
203
204 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
205out:
206 mlog_exit(ret);
207 return ret;
208}
209
Adrian Bunk6cb129f2007-04-26 00:29:35 -0700210static int ocfs2_set_inode_size(handle_t *handle,
211 struct inode *inode,
212 struct buffer_head *fe_bh,
213 u64 new_i_size)
Mark Fashehccd979b2005-12-15 14:31:24 -0800214{
215 int status;
216
217 mlog_entry_void();
218 i_size_write(inode, new_i_size);
Mark Fasheh8110b072007-03-22 16:53:23 -0700219 inode->i_blocks = ocfs2_inode_sector_count(inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800220 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
221
222 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
223 if (status < 0) {
224 mlog_errno(status);
225 goto bail;
226 }
227
228bail:
229 mlog_exit(status);
230 return status;
231}
232
233static int ocfs2_simple_size_update(struct inode *inode,
234 struct buffer_head *di_bh,
235 u64 new_i_size)
236{
237 int ret;
238 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fasheh1fabe142006-10-09 18:11:45 -0700239 handle_t *handle = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800240
Mark Fasheh65eff9c2006-10-09 17:26:22 -0700241 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
Mark Fashehccd979b2005-12-15 14:31:24 -0800242 if (handle == NULL) {
243 ret = -ENOMEM;
244 mlog_errno(ret);
245 goto out;
246 }
247
248 ret = ocfs2_set_inode_size(handle, inode, di_bh,
249 new_i_size);
250 if (ret < 0)
251 mlog_errno(ret);
252
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700253 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -0800254out:
255 return ret;
256}
257
258static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
259 struct inode *inode,
260 struct buffer_head *fe_bh,
261 u64 new_i_size)
262{
263 int status;
Mark Fasheh1fabe142006-10-09 18:11:45 -0700264 handle_t *handle;
Mark Fasheh60b11392007-02-16 11:46:50 -0800265 struct ocfs2_dinode *di;
Mark Fashehccd979b2005-12-15 14:31:24 -0800266
267 mlog_entry_void();
268
269 /* TODO: This needs to actually orphan the inode in this
270 * transaction. */
271
Mark Fasheh65eff9c2006-10-09 17:26:22 -0700272 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
Mark Fashehccd979b2005-12-15 14:31:24 -0800273 if (IS_ERR(handle)) {
274 status = PTR_ERR(handle);
275 mlog_errno(status);
276 goto out;
277 }
278
Mark Fasheh60b11392007-02-16 11:46:50 -0800279 status = ocfs2_journal_access(handle, inode, fe_bh,
280 OCFS2_JOURNAL_ACCESS_WRITE);
281 if (status < 0) {
282 mlog_errno(status);
283 goto out_commit;
284 }
285
286 /*
287 * Do this before setting i_size.
288 */
289 status = ocfs2_zero_tail_for_truncate(inode, handle, new_i_size);
290 if (status) {
291 mlog_errno(status);
292 goto out_commit;
293 }
294
295 i_size_write(inode, new_i_size);
296 inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size);
297 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
298
299 di = (struct ocfs2_dinode *) fe_bh->b_data;
300 di->i_size = cpu_to_le64(new_i_size);
301 di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
302 di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
303
304 status = ocfs2_journal_dirty(handle, fe_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800305 if (status < 0)
306 mlog_errno(status);
307
Mark Fasheh60b11392007-02-16 11:46:50 -0800308out_commit:
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700309 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -0800310out:
Mark Fasheh60b11392007-02-16 11:46:50 -0800311
Mark Fashehccd979b2005-12-15 14:31:24 -0800312 mlog_exit(status);
313 return status;
314}
315
316static int ocfs2_truncate_file(struct inode *inode,
317 struct buffer_head *di_bh,
318 u64 new_i_size)
319{
320 int status = 0;
321 struct ocfs2_dinode *fe = NULL;
322 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
323 struct ocfs2_truncate_context *tc = NULL;
324
Mark Fashehb0697052006-03-03 10:24:33 -0800325 mlog_entry("(inode = %llu, new_i_size = %llu\n",
326 (unsigned long long)OCFS2_I(inode)->ip_blkno,
327 (unsigned long long)new_i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -0800328
329 truncate_inode_pages(inode->i_mapping, new_i_size);
330
331 fe = (struct ocfs2_dinode *) di_bh->b_data;
332 if (!OCFS2_IS_VALID_DINODE(fe)) {
333 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
334 status = -EIO;
335 goto bail;
336 }
337
338 mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
Mark Fashehb0697052006-03-03 10:24:33 -0800339 "Inode %llu, inode i_size = %lld != di "
340 "i_size = %llu, i_flags = 0x%x\n",
341 (unsigned long long)OCFS2_I(inode)->ip_blkno,
Mark Fashehccd979b2005-12-15 14:31:24 -0800342 i_size_read(inode),
Mark Fashehb0697052006-03-03 10:24:33 -0800343 (unsigned long long)le64_to_cpu(fe->i_size),
344 le32_to_cpu(fe->i_flags));
Mark Fashehccd979b2005-12-15 14:31:24 -0800345
346 if (new_i_size > le64_to_cpu(fe->i_size)) {
Mark Fashehb0697052006-03-03 10:24:33 -0800347 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
348 (unsigned long long)le64_to_cpu(fe->i_size),
349 (unsigned long long)new_i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -0800350 status = -EINVAL;
351 mlog_errno(status);
352 goto bail;
353 }
354
Mark Fashehb0697052006-03-03 10:24:33 -0800355 mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
356 (unsigned long long)le64_to_cpu(fe->i_blkno),
357 (unsigned long long)le64_to_cpu(fe->i_size),
358 (unsigned long long)new_i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -0800359
360 /* lets handle the simple truncate cases before doing any more
361 * cluster locking. */
362 if (new_i_size == le64_to_cpu(fe->i_size))
363 goto bail;
364
Mark Fashehab0920c2006-03-16 15:06:37 -0800365 /* This forces other nodes to sync and drop their pages. Do
366 * this even if we have a truncate without allocation change -
367 * ocfs2 cluster sizes can be much greater than page size, so
368 * we have to truncate them anyway. */
369 status = ocfs2_data_lock(inode, 1);
370 if (status < 0) {
371 mlog_errno(status);
372 goto bail;
373 }
Mark Fashehab0920c2006-03-16 15:06:37 -0800374
Mark Fashehccd979b2005-12-15 14:31:24 -0800375 /* alright, we're going to need to do a full blown alloc size
376 * change. Orphan the inode so that recovery can complete the
377 * truncate if necessary. This does the task of marking
378 * i_size. */
379 status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
380 if (status < 0) {
381 mlog_errno(status);
Mark Fasheh60b11392007-02-16 11:46:50 -0800382 goto bail_unlock_data;
Mark Fashehccd979b2005-12-15 14:31:24 -0800383 }
384
385 status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
386 if (status < 0) {
387 mlog_errno(status);
Mark Fasheh60b11392007-02-16 11:46:50 -0800388 goto bail_unlock_data;
Mark Fashehccd979b2005-12-15 14:31:24 -0800389 }
390
391 status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
392 if (status < 0) {
393 mlog_errno(status);
Mark Fasheh60b11392007-02-16 11:46:50 -0800394 goto bail_unlock_data;
Mark Fashehccd979b2005-12-15 14:31:24 -0800395 }
396
397 /* TODO: orphan dir cleanup here. */
Mark Fasheh60b11392007-02-16 11:46:50 -0800398bail_unlock_data:
399 ocfs2_data_unlock(inode, 1);
400
Mark Fashehccd979b2005-12-15 14:31:24 -0800401bail:
402
403 mlog_exit(status);
404 return status;
405}
406
407/*
408 * extend allocation only here.
409 * we'll update all the disk stuff, and oip->alloc_size
410 *
411 * expect stuff to be locked, a transaction started and enough data /
412 * metadata reservations in the contexts.
413 *
414 * Will return -EAGAIN, and a reason if a restart is needed.
415 * If passed in, *reason will always be set, even in error.
416 */
417int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
418 struct inode *inode,
Mark Fashehdcd05382007-01-16 11:32:23 -0800419 u32 *logical_offset,
Mark Fashehccd979b2005-12-15 14:31:24 -0800420 u32 clusters_to_add,
421 struct buffer_head *fe_bh,
Mark Fasheh1fabe142006-10-09 18:11:45 -0700422 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -0800423 struct ocfs2_alloc_context *data_ac,
424 struct ocfs2_alloc_context *meta_ac,
425 enum ocfs2_alloc_restarted *reason_ret)
426{
427 int status = 0;
428 int free_extents;
429 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
430 enum ocfs2_alloc_restarted reason = RESTART_NONE;
431 u32 bit_off, num_bits;
432 u64 block;
433
434 BUG_ON(!clusters_to_add);
435
436 free_extents = ocfs2_num_free_extents(osb, inode, fe);
437 if (free_extents < 0) {
438 status = free_extents;
439 mlog_errno(status);
440 goto leave;
441 }
442
443 /* there are two cases which could cause us to EAGAIN in the
444 * we-need-more-metadata case:
445 * 1) we haven't reserved *any*
446 * 2) we are so fragmented, we've needed to add metadata too
447 * many times. */
448 if (!free_extents && !meta_ac) {
449 mlog(0, "we haven't reserved any metadata!\n");
450 status = -EAGAIN;
451 reason = RESTART_META;
452 goto leave;
453 } else if ((!free_extents)
454 && (ocfs2_alloc_context_bits_left(meta_ac)
455 < ocfs2_extend_meta_needed(fe))) {
456 mlog(0, "filesystem is really fragmented...\n");
457 status = -EAGAIN;
458 reason = RESTART_META;
459 goto leave;
460 }
461
462 status = ocfs2_claim_clusters(osb, handle, data_ac, 1,
463 &bit_off, &num_bits);
464 if (status < 0) {
465 if (status != -ENOSPC)
466 mlog_errno(status);
467 goto leave;
468 }
469
470 BUG_ON(num_bits > clusters_to_add);
471
472 /* reserve our write early -- insert_extent may update the inode */
473 status = ocfs2_journal_access(handle, inode, fe_bh,
474 OCFS2_JOURNAL_ACCESS_WRITE);
475 if (status < 0) {
476 mlog_errno(status);
477 goto leave;
478 }
479
480 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
Mark Fashehb0697052006-03-03 10:24:33 -0800481 mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
482 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
Mark Fashehdcd05382007-01-16 11:32:23 -0800483 status = ocfs2_insert_extent(osb, handle, inode, fe_bh,
484 *logical_offset, block, num_bits,
485 meta_ac);
Mark Fashehccd979b2005-12-15 14:31:24 -0800486 if (status < 0) {
487 mlog_errno(status);
488 goto leave;
489 }
490
Mark Fashehccd979b2005-12-15 14:31:24 -0800491 status = ocfs2_journal_dirty(handle, fe_bh);
492 if (status < 0) {
493 mlog_errno(status);
494 goto leave;
495 }
496
497 clusters_to_add -= num_bits;
Mark Fashehdcd05382007-01-16 11:32:23 -0800498 *logical_offset += num_bits;
Mark Fashehccd979b2005-12-15 14:31:24 -0800499
500 if (clusters_to_add) {
501 mlog(0, "need to alloc once more, clusters = %u, wanted = "
502 "%u\n", fe->i_clusters, clusters_to_add);
503 status = -EAGAIN;
504 reason = RESTART_TRANS;
505 }
506
507leave:
508 mlog_exit(status);
509 if (reason_ret)
510 *reason_ret = reason;
511 return status;
512}
513
Mark Fashehabf8b152007-01-17 13:07:24 -0800514/*
515 * For a given allocation, determine which allocators will need to be
516 * accessed, and lock them, reserving the appropriate number of bits.
517 *
518 * Called from ocfs2_extend_allocation() for file systems which don't
Mark Fasheh9517bac2007-02-09 20:24:12 -0800519 * support holes, and from ocfs2_write() for file systems which
520 * understand sparse inodes.
Mark Fashehabf8b152007-01-17 13:07:24 -0800521 */
Mark Fasheh9517bac2007-02-09 20:24:12 -0800522int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di,
523 u32 clusters_to_add,
524 struct ocfs2_alloc_context **data_ac,
525 struct ocfs2_alloc_context **meta_ac)
Mark Fashehabf8b152007-01-17 13:07:24 -0800526{
527 int ret, num_free_extents;
528 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
529
530 *meta_ac = NULL;
531 *data_ac = NULL;
532
533 mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
534 "clusters_to_add = %u\n",
535 (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode),
536 le32_to_cpu(di->i_clusters), clusters_to_add);
537
538 num_free_extents = ocfs2_num_free_extents(osb, inode, di);
539 if (num_free_extents < 0) {
540 ret = num_free_extents;
541 mlog_errno(ret);
542 goto out;
543 }
544
545 /*
546 * Sparse allocation file systems need to be more conservative
547 * with reserving room for expansion - the actual allocation
548 * happens while we've got a journal handle open so re-taking
549 * a cluster lock (because we ran out of room for another
550 * extent) will violate ordering rules.
551 *
Mark Fasheh9517bac2007-02-09 20:24:12 -0800552 * Most of the time we'll only be seeing this 1 cluster at a time
Mark Fashehabf8b152007-01-17 13:07:24 -0800553 * anyway.
554 */
555 if (!num_free_extents ||
556 (ocfs2_sparse_alloc(osb) && num_free_extents < clusters_to_add)) {
557 ret = ocfs2_reserve_new_metadata(osb, di, meta_ac);
558 if (ret < 0) {
559 if (ret != -ENOSPC)
560 mlog_errno(ret);
561 goto out;
562 }
563 }
564
565 ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
566 if (ret < 0) {
567 if (ret != -ENOSPC)
568 mlog_errno(ret);
569 goto out;
570 }
571
572out:
573 if (ret) {
574 if (*meta_ac) {
575 ocfs2_free_alloc_context(*meta_ac);
576 *meta_ac = NULL;
577 }
578
579 /*
580 * We cannot have an error and a non null *data_ac.
581 */
582 }
583
584 return ret;
585}
586
Mark Fashehccd979b2005-12-15 14:31:24 -0800587static int ocfs2_extend_allocation(struct inode *inode,
588 u32 clusters_to_add)
589{
590 int status = 0;
591 int restart_func = 0;
592 int drop_alloc_sem = 0;
Mark Fashehabf8b152007-01-17 13:07:24 -0800593 int credits;
Mark Fashehdcd05382007-01-16 11:32:23 -0800594 u32 prev_clusters, logical_start;
Mark Fashehccd979b2005-12-15 14:31:24 -0800595 struct buffer_head *bh = NULL;
596 struct ocfs2_dinode *fe = NULL;
Mark Fasheh1fabe142006-10-09 18:11:45 -0700597 handle_t *handle = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800598 struct ocfs2_alloc_context *data_ac = NULL;
599 struct ocfs2_alloc_context *meta_ac = NULL;
600 enum ocfs2_alloc_restarted why;
601 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
602
603 mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
604
Mark Fashehdcd05382007-01-16 11:32:23 -0800605 /*
606 * This function only exists for file systems which don't
607 * support holes.
608 */
609 BUG_ON(ocfs2_sparse_alloc(osb));
610
Mark Fashehccd979b2005-12-15 14:31:24 -0800611 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
612 OCFS2_BH_CACHED, inode);
613 if (status < 0) {
614 mlog_errno(status);
615 goto leave;
616 }
617
618 fe = (struct ocfs2_dinode *) bh->b_data;
619 if (!OCFS2_IS_VALID_DINODE(fe)) {
620 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
621 status = -EIO;
622 goto leave;
623 }
624
Mark Fashehdcd05382007-01-16 11:32:23 -0800625 logical_start = OCFS2_I(inode)->ip_clusters;
626
Mark Fashehccd979b2005-12-15 14:31:24 -0800627restart_all:
628 BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
629
Mark Fashehccd979b2005-12-15 14:31:24 -0800630 /* blocks peope in read/write from reading our allocation
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800631 * until we're done changing it. We depend on i_mutex to block
Mark Fashehccd979b2005-12-15 14:31:24 -0800632 * other extend/truncate calls while we're here. Ordering wrt
633 * start_trans is important here -- always do it before! */
634 down_write(&OCFS2_I(inode)->ip_alloc_sem);
635 drop_alloc_sem = 1;
636
Mark Fasheh9517bac2007-02-09 20:24:12 -0800637 status = ocfs2_lock_allocators(inode, fe, clusters_to_add, &data_ac,
638 &meta_ac);
639 if (status) {
640 mlog_errno(status);
641 goto leave;
642 }
643
Mark Fashehccd979b2005-12-15 14:31:24 -0800644 credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
Mark Fasheh65eff9c2006-10-09 17:26:22 -0700645 handle = ocfs2_start_trans(osb, credits);
Mark Fashehccd979b2005-12-15 14:31:24 -0800646 if (IS_ERR(handle)) {
647 status = PTR_ERR(handle);
648 handle = NULL;
649 mlog_errno(status);
650 goto leave;
651 }
652
653restarted_transaction:
654 /* reserve a write to the file entry early on - that we if we
655 * run out of credits in the allocation path, we can still
656 * update i_size. */
657 status = ocfs2_journal_access(handle, inode, bh,
658 OCFS2_JOURNAL_ACCESS_WRITE);
659 if (status < 0) {
660 mlog_errno(status);
661 goto leave;
662 }
663
664 prev_clusters = OCFS2_I(inode)->ip_clusters;
665
666 status = ocfs2_do_extend_allocation(osb,
667 inode,
Mark Fashehdcd05382007-01-16 11:32:23 -0800668 &logical_start,
Mark Fashehccd979b2005-12-15 14:31:24 -0800669 clusters_to_add,
670 bh,
671 handle,
672 data_ac,
673 meta_ac,
674 &why);
675 if ((status < 0) && (status != -EAGAIN)) {
676 if (status != -ENOSPC)
677 mlog_errno(status);
678 goto leave;
679 }
680
681 status = ocfs2_journal_dirty(handle, bh);
682 if (status < 0) {
683 mlog_errno(status);
684 goto leave;
685 }
686
687 spin_lock(&OCFS2_I(inode)->ip_lock);
688 clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
689 spin_unlock(&OCFS2_I(inode)->ip_lock);
690
691 if (why != RESTART_NONE && clusters_to_add) {
692 if (why == RESTART_META) {
693 mlog(0, "restarting function.\n");
694 restart_func = 1;
695 } else {
696 BUG_ON(why != RESTART_TRANS);
697
698 mlog(0, "restarting transaction.\n");
699 /* TODO: This can be more intelligent. */
700 credits = ocfs2_calc_extend_credits(osb->sb,
701 fe,
702 clusters_to_add);
Mark Fasheh1fabe142006-10-09 18:11:45 -0700703 status = ocfs2_extend_trans(handle, credits);
Mark Fashehccd979b2005-12-15 14:31:24 -0800704 if (status < 0) {
705 /* handle still has to be committed at
706 * this point. */
707 status = -ENOMEM;
708 mlog_errno(status);
709 goto leave;
710 }
711 goto restarted_transaction;
712 }
713 }
714
Mark Fashehb0697052006-03-03 10:24:33 -0800715 mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
Mark Fasheh1ca1a112007-04-27 16:01:25 -0700716 le32_to_cpu(fe->i_clusters),
717 (unsigned long long)le64_to_cpu(fe->i_size));
Mark Fashehccd979b2005-12-15 14:31:24 -0800718 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
719 OCFS2_I(inode)->ip_clusters, i_size_read(inode));
720
721leave:
722 if (drop_alloc_sem) {
723 up_write(&OCFS2_I(inode)->ip_alloc_sem);
724 drop_alloc_sem = 0;
725 }
726 if (handle) {
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700727 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -0800728 handle = NULL;
729 }
730 if (data_ac) {
731 ocfs2_free_alloc_context(data_ac);
732 data_ac = NULL;
733 }
734 if (meta_ac) {
735 ocfs2_free_alloc_context(meta_ac);
736 meta_ac = NULL;
737 }
738 if ((!status) && restart_func) {
739 restart_func = 0;
740 goto restart_all;
741 }
742 if (bh) {
743 brelse(bh);
744 bh = NULL;
745 }
746
747 mlog_exit(status);
748 return status;
749}
750
751/* Some parts of this taken from generic_cont_expand, which turned out
752 * to be too fragile to do exactly what we need without us having to
Mark Fasheh53013cb2006-05-05 19:04:03 -0700753 * worry about recursive locking in ->prepare_write() and
754 * ->commit_write(). */
Mark Fashehccd979b2005-12-15 14:31:24 -0800755static int ocfs2_write_zero_page(struct inode *inode,
756 u64 size)
757{
758 struct address_space *mapping = inode->i_mapping;
759 struct page *page;
760 unsigned long index;
761 unsigned int offset;
Mark Fasheh1fabe142006-10-09 18:11:45 -0700762 handle_t *handle = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800763 int ret;
764
765 offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
766 /* ugh. in prepare/commit_write, if from==to==start of block, we
767 ** skip the prepare. make sure we never send an offset for the start
768 ** of a block
769 */
770 if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
771 offset++;
772 }
773 index = size >> PAGE_CACHE_SHIFT;
774
775 page = grab_cache_page(mapping, index);
776 if (!page) {
777 ret = -ENOMEM;
778 mlog_errno(ret);
779 goto out;
780 }
781
Mark Fasheh53013cb2006-05-05 19:04:03 -0700782 ret = ocfs2_prepare_write_nolock(inode, page, offset, offset);
Mark Fashehccd979b2005-12-15 14:31:24 -0800783 if (ret < 0) {
784 mlog_errno(ret);
785 goto out_unlock;
786 }
787
788 if (ocfs2_should_order_data(inode)) {
789 handle = ocfs2_start_walk_page_trans(inode, page, offset,
790 offset);
791 if (IS_ERR(handle)) {
792 ret = PTR_ERR(handle);
793 handle = NULL;
794 goto out_unlock;
795 }
796 }
797
798 /* must not update i_size! */
799 ret = block_commit_write(page, offset, offset);
800 if (ret < 0)
801 mlog_errno(ret);
802 else
803 ret = 0;
804
805 if (handle)
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700806 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
Mark Fashehccd979b2005-12-15 14:31:24 -0800807out_unlock:
808 unlock_page(page);
809 page_cache_release(page);
810out:
811 return ret;
812}
813
814static int ocfs2_zero_extend(struct inode *inode,
815 u64 zero_to_size)
816{
817 int ret = 0;
818 u64 start_off;
819 struct super_block *sb = inode->i_sb;
820
821 start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
822 while (start_off < zero_to_size) {
823 ret = ocfs2_write_zero_page(inode, start_off);
824 if (ret < 0) {
825 mlog_errno(ret);
826 goto out;
827 }
828
829 start_off += sb->s_blocksize;
Mark Fashehe2057c52006-10-03 17:53:05 -0700830
831 /*
832 * Very large extends have the potential to lock up
833 * the cpu for extended periods of time.
834 */
835 cond_resched();
Mark Fashehccd979b2005-12-15 14:31:24 -0800836 }
837
838out:
839 return ret;
840}
841
Mark Fasheh53013cb2006-05-05 19:04:03 -0700842/*
843 * A tail_to_skip value > 0 indicates that we're being called from
844 * ocfs2_file_aio_write(). This has the following implications:
845 *
846 * - we don't want to update i_size
847 * - di_bh will be NULL, which is fine because it's only used in the
848 * case where we want to update i_size.
849 * - ocfs2_zero_extend() will then only be filling the hole created
850 * between i_size and the start of the write.
851 */
Mark Fashehccd979b2005-12-15 14:31:24 -0800852static int ocfs2_extend_file(struct inode *inode,
853 struct buffer_head *di_bh,
Mark Fasheh53013cb2006-05-05 19:04:03 -0700854 u64 new_i_size,
855 size_t tail_to_skip)
Mark Fashehccd979b2005-12-15 14:31:24 -0800856{
857 int ret = 0;
Mark Fasheh3a0782d2007-01-17 12:53:31 -0800858 u32 clusters_to_add = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -0800859
Mark Fasheh53013cb2006-05-05 19:04:03 -0700860 BUG_ON(!tail_to_skip && !di_bh);
861
Mark Fashehccd979b2005-12-15 14:31:24 -0800862 /* setattr sometimes calls us like this. */
863 if (new_i_size == 0)
864 goto out;
865
866 if (i_size_read(inode) == new_i_size)
867 goto out;
868 BUG_ON(new_i_size < i_size_read(inode));
869
Mark Fasheh3a0782d2007-01-17 12:53:31 -0800870 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) {
871 BUG_ON(tail_to_skip != 0);
872 goto out_update_size;
873 }
874
Mark Fashehccd979b2005-12-15 14:31:24 -0800875 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) -
876 OCFS2_I(inode)->ip_clusters;
877
Mark Fasheh0effef72006-10-03 17:44:42 -0700878 /*
879 * protect the pages that ocfs2_zero_extend is going to be
880 * pulling into the page cache.. we do this before the
881 * metadata extend so that we don't get into the situation
882 * where we've extended the metadata but can't get the data
883 * lock to zero.
884 */
885 ret = ocfs2_data_lock(inode, 1);
886 if (ret < 0) {
887 mlog_errno(ret);
888 goto out;
889 }
Mark Fasheh53013cb2006-05-05 19:04:03 -0700890
Mark Fasheh0effef72006-10-03 17:44:42 -0700891 if (clusters_to_add) {
Mark Fashehccd979b2005-12-15 14:31:24 -0800892 ret = ocfs2_extend_allocation(inode, clusters_to_add);
893 if (ret < 0) {
894 mlog_errno(ret);
Mark Fasheh53013cb2006-05-05 19:04:03 -0700895 goto out_unlock;
Mark Fashehccd979b2005-12-15 14:31:24 -0800896 }
Mark Fasheh0effef72006-10-03 17:44:42 -0700897 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800898
Mark Fasheh0effef72006-10-03 17:44:42 -0700899 /*
900 * Call this even if we don't add any clusters to the tree. We
901 * still need to zero the area between the old i_size and the
902 * new i_size.
903 */
904 ret = ocfs2_zero_extend(inode, (u64)new_i_size - tail_to_skip);
905 if (ret < 0) {
906 mlog_errno(ret);
907 goto out_unlock;
Mark Fashehccd979b2005-12-15 14:31:24 -0800908 }
909
Mark Fasheh3a0782d2007-01-17 12:53:31 -0800910out_update_size:
Mark Fasheh53013cb2006-05-05 19:04:03 -0700911 if (!tail_to_skip) {
912 /* We're being called from ocfs2_setattr() which wants
913 * us to update i_size */
914 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
915 if (ret < 0)
916 mlog_errno(ret);
917 }
918
919out_unlock:
Mark Fasheh3a0782d2007-01-17 12:53:31 -0800920 if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
921 ocfs2_data_unlock(inode, 1);
Mark Fasheh53013cb2006-05-05 19:04:03 -0700922
Mark Fashehccd979b2005-12-15 14:31:24 -0800923out:
924 return ret;
925}
926
927int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
928{
929 int status = 0, size_change;
930 struct inode *inode = dentry->d_inode;
931 struct super_block *sb = inode->i_sb;
932 struct ocfs2_super *osb = OCFS2_SB(sb);
933 struct buffer_head *bh = NULL;
Mark Fasheh1fabe142006-10-09 18:11:45 -0700934 handle_t *handle = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800935
936 mlog_entry("(0x%p, '%.*s')\n", dentry,
937 dentry->d_name.len, dentry->d_name.name);
938
939 if (attr->ia_valid & ATTR_MODE)
940 mlog(0, "mode change: %d\n", attr->ia_mode);
941 if (attr->ia_valid & ATTR_UID)
942 mlog(0, "uid change: %d\n", attr->ia_uid);
943 if (attr->ia_valid & ATTR_GID)
944 mlog(0, "gid change: %d\n", attr->ia_gid);
945 if (attr->ia_valid & ATTR_SIZE)
946 mlog(0, "size change...\n");
947 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
948 mlog(0, "time change...\n");
949
950#define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
951 | ATTR_GID | ATTR_UID | ATTR_MODE)
952 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
953 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
954 return 0;
955 }
956
957 status = inode_change_ok(inode, attr);
958 if (status)
959 return status;
960
961 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
962 if (size_change) {
963 status = ocfs2_rw_lock(inode, 1);
964 if (status < 0) {
965 mlog_errno(status);
966 goto bail;
967 }
968 }
969
Mark Fasheh4bcec182006-10-09 16:02:40 -0700970 status = ocfs2_meta_lock(inode, &bh, 1);
Mark Fashehccd979b2005-12-15 14:31:24 -0800971 if (status < 0) {
972 if (status != -ENOENT)
973 mlog_errno(status);
974 goto bail_unlock_rw;
975 }
976
977 if (size_change && attr->ia_size != i_size_read(inode)) {
978 if (i_size_read(inode) > attr->ia_size)
979 status = ocfs2_truncate_file(inode, bh, attr->ia_size);
980 else
Mark Fasheh53013cb2006-05-05 19:04:03 -0700981 status = ocfs2_extend_file(inode, bh, attr->ia_size, 0);
Mark Fashehccd979b2005-12-15 14:31:24 -0800982 if (status < 0) {
983 if (status != -ENOSPC)
984 mlog_errno(status);
985 status = -ENOSPC;
986 goto bail_unlock;
987 }
988 }
989
Mark Fasheh65eff9c2006-10-09 17:26:22 -0700990 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
Mark Fashehccd979b2005-12-15 14:31:24 -0800991 if (IS_ERR(handle)) {
992 status = PTR_ERR(handle);
993 mlog_errno(status);
994 goto bail_unlock;
995 }
996
997 status = inode_setattr(inode, attr);
998 if (status < 0) {
999 mlog_errno(status);
1000 goto bail_commit;
1001 }
1002
1003 status = ocfs2_mark_inode_dirty(handle, inode, bh);
1004 if (status < 0)
1005 mlog_errno(status);
1006
1007bail_commit:
Mark Fasheh02dc1af2006-10-09 16:48:10 -07001008 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -08001009bail_unlock:
1010 ocfs2_meta_unlock(inode, 1);
1011bail_unlock_rw:
1012 if (size_change)
1013 ocfs2_rw_unlock(inode, 1);
1014bail:
1015 if (bh)
1016 brelse(bh);
1017
1018 mlog_exit(status);
1019 return status;
1020}
1021
1022int ocfs2_getattr(struct vfsmount *mnt,
1023 struct dentry *dentry,
1024 struct kstat *stat)
1025{
1026 struct inode *inode = dentry->d_inode;
1027 struct super_block *sb = dentry->d_inode->i_sb;
1028 struct ocfs2_super *osb = sb->s_fs_info;
1029 int err;
1030
1031 mlog_entry_void();
1032
1033 err = ocfs2_inode_revalidate(dentry);
1034 if (err) {
1035 if (err != -ENOENT)
1036 mlog_errno(err);
1037 goto bail;
1038 }
1039
1040 generic_fillattr(inode, stat);
1041
1042 /* We set the blksize from the cluster size for performance */
1043 stat->blksize = osb->s_clustersize;
1044
1045bail:
1046 mlog_exit(err);
1047
1048 return err;
1049}
1050
Tiger Yangd38eb8d2006-11-27 09:59:21 +08001051int ocfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
1052{
1053 int ret;
1054
1055 mlog_entry_void();
1056
1057 ret = ocfs2_meta_lock(inode, NULL, 0);
1058 if (ret) {
Mark Fasheha9f5f702007-04-26 11:43:43 -07001059 if (ret != -ENOENT)
1060 mlog_errno(ret);
Tiger Yangd38eb8d2006-11-27 09:59:21 +08001061 goto out;
1062 }
1063
1064 ret = generic_permission(inode, mask, NULL);
Tiger Yangd38eb8d2006-11-27 09:59:21 +08001065
1066 ocfs2_meta_unlock(inode, 0);
1067out:
1068 mlog_exit(ret);
1069 return ret;
1070}
1071
Mark Fashehccd979b2005-12-15 14:31:24 -08001072static int ocfs2_write_remove_suid(struct inode *inode)
1073{
1074 int ret;
1075 struct buffer_head *bh = NULL;
1076 struct ocfs2_inode_info *oi = OCFS2_I(inode);
Mark Fasheh1fabe142006-10-09 18:11:45 -07001077 handle_t *handle;
Mark Fashehccd979b2005-12-15 14:31:24 -08001078 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1079 struct ocfs2_dinode *di;
1080
Mark Fashehb0697052006-03-03 10:24:33 -08001081 mlog_entry("(Inode %llu, mode 0%o)\n",
1082 (unsigned long long)oi->ip_blkno, inode->i_mode);
Mark Fashehccd979b2005-12-15 14:31:24 -08001083
Mark Fasheh65eff9c2006-10-09 17:26:22 -07001084 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
Mark Fashehccd979b2005-12-15 14:31:24 -08001085 if (handle == NULL) {
1086 ret = -ENOMEM;
1087 mlog_errno(ret);
1088 goto out;
1089 }
1090
1091 ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
1092 if (ret < 0) {
1093 mlog_errno(ret);
1094 goto out_trans;
1095 }
1096
1097 ret = ocfs2_journal_access(handle, inode, bh,
1098 OCFS2_JOURNAL_ACCESS_WRITE);
1099 if (ret < 0) {
1100 mlog_errno(ret);
1101 goto out_bh;
1102 }
1103
1104 inode->i_mode &= ~S_ISUID;
1105 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1106 inode->i_mode &= ~S_ISGID;
1107
1108 di = (struct ocfs2_dinode *) bh->b_data;
1109 di->i_mode = cpu_to_le16(inode->i_mode);
1110
1111 ret = ocfs2_journal_dirty(handle, bh);
1112 if (ret < 0)
1113 mlog_errno(ret);
1114out_bh:
1115 brelse(bh);
1116out_trans:
Mark Fasheh02dc1af2006-10-09 16:48:10 -07001117 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -08001118out:
1119 mlog_exit(ret);
1120 return ret;
1121}
1122
Mark Fasheh9517bac2007-02-09 20:24:12 -08001123/*
1124 * Will look for holes and unwritten extents in the range starting at
1125 * pos for count bytes (inclusive).
1126 */
1127static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1128 size_t count)
1129{
1130 int ret = 0;
Mark Fasheh49cb8d22007-03-09 16:21:46 -08001131 unsigned int extent_flags;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001132 u32 cpos, clusters, extent_len, phys_cpos;
1133 struct super_block *sb = inode->i_sb;
1134
1135 cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1136 clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1137
1138 while (clusters) {
Mark Fasheh49cb8d22007-03-09 16:21:46 -08001139 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1140 &extent_flags);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001141 if (ret < 0) {
1142 mlog_errno(ret);
1143 goto out;
1144 }
1145
Mark Fasheh49cb8d22007-03-09 16:21:46 -08001146 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001147 ret = 1;
1148 break;
1149 }
1150
1151 if (extent_len > clusters)
1152 extent_len = clusters;
1153
1154 clusters -= extent_len;
1155 cpos += extent_len;
1156 }
1157out:
1158 return ret;
1159}
1160
Tiger Yang8659ac22006-10-17 18:29:52 -07001161static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
1162 loff_t *ppos,
1163 size_t count,
Mark Fasheh9517bac2007-02-09 20:24:12 -08001164 int appending,
1165 int *direct_io)
Mark Fashehccd979b2005-12-15 14:31:24 -08001166{
Tiger Yang8659ac22006-10-17 18:29:52 -07001167 int ret = 0, meta_level = appending;
1168 struct inode *inode = dentry->d_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -08001169 u32 clusters;
Mark Fashehccd979b2005-12-15 14:31:24 -08001170 loff_t newsize, saved_pos;
Mark Fashehccd979b2005-12-15 14:31:24 -08001171
Mark Fashehccd979b2005-12-15 14:31:24 -08001172 /*
1173 * We sample i_size under a read level meta lock to see if our write
1174 * is extending the file, if it is we back off and get a write level
1175 * meta lock.
1176 */
Mark Fashehccd979b2005-12-15 14:31:24 -08001177 for(;;) {
Mark Fasheh4bcec182006-10-09 16:02:40 -07001178 ret = ocfs2_meta_lock(inode, NULL, meta_level);
Mark Fashehccd979b2005-12-15 14:31:24 -08001179 if (ret < 0) {
1180 meta_level = -1;
1181 mlog_errno(ret);
1182 goto out;
1183 }
1184
1185 /* Clear suid / sgid if necessary. We do this here
1186 * instead of later in the write path because
1187 * remove_suid() calls ->setattr without any hint that
1188 * we may have already done our cluster locking. Since
1189 * ocfs2_setattr() *must* take cluster locks to
1190 * proceeed, this will lead us to recursively lock the
1191 * inode. There's also the dinode i_size state which
1192 * can be lost via setattr during extending writes (we
1193 * set inode->i_size at the end of a write. */
Tiger Yang8659ac22006-10-17 18:29:52 -07001194 if (should_remove_suid(dentry)) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001195 if (meta_level == 0) {
1196 ocfs2_meta_unlock(inode, meta_level);
1197 meta_level = 1;
1198 continue;
1199 }
1200
1201 ret = ocfs2_write_remove_suid(inode);
1202 if (ret < 0) {
1203 mlog_errno(ret);
Tiger Yang8659ac22006-10-17 18:29:52 -07001204 goto out_unlock;
Mark Fashehccd979b2005-12-15 14:31:24 -08001205 }
1206 }
1207
1208 /* work on a copy of ppos until we're sure that we won't have
1209 * to recalculate it due to relocking. */
Tiger Yang8659ac22006-10-17 18:29:52 -07001210 if (appending) {
Mark Fashehccd979b2005-12-15 14:31:24 -08001211 saved_pos = i_size_read(inode);
1212 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
1213 } else {
Tiger Yang8659ac22006-10-17 18:29:52 -07001214 saved_pos = *ppos;
Mark Fashehccd979b2005-12-15 14:31:24 -08001215 }
Mark Fasheh3a0782d2007-01-17 12:53:31 -08001216
Mark Fasheh9517bac2007-02-09 20:24:12 -08001217 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) {
1218 loff_t end = saved_pos + count;
1219
1220 /*
1221 * Skip the O_DIRECT checks if we don't need
1222 * them.
1223 */
1224 if (!direct_io || !(*direct_io))
1225 break;
1226
1227 /*
1228 * Allowing concurrent direct writes means
1229 * i_size changes wouldn't be synchronized, so
1230 * one node could wind up truncating another
1231 * nodes writes.
1232 */
1233 if (end > i_size_read(inode)) {
1234 *direct_io = 0;
1235 break;
1236 }
1237
1238 /*
1239 * We don't fill holes during direct io, so
1240 * check for them here. If any are found, the
1241 * caller will have to retake some cluster
1242 * locks and initiate the io as buffered.
1243 */
1244 ret = ocfs2_check_range_for_holes(inode, saved_pos,
1245 count);
1246 if (ret == 1) {
1247 *direct_io = 0;
1248 ret = 0;
1249 } else if (ret < 0)
1250 mlog_errno(ret);
1251 break;
1252 }
1253
Mark Fasheh3a0782d2007-01-17 12:53:31 -08001254 /*
1255 * The rest of this loop is concerned with legacy file
1256 * systems which don't support sparse files.
1257 */
Mark Fasheh3a0782d2007-01-17 12:53:31 -08001258
Tiger Yang8659ac22006-10-17 18:29:52 -07001259 newsize = count + saved_pos;
Mark Fashehccd979b2005-12-15 14:31:24 -08001260
Mark Fasheh215c7f92006-02-01 16:42:10 -08001261 mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
1262 (long long) saved_pos, (long long) newsize,
1263 (long long) i_size_read(inode));
Mark Fashehccd979b2005-12-15 14:31:24 -08001264
1265 /* No need for a higher level metadata lock if we're
1266 * never going past i_size. */
1267 if (newsize <= i_size_read(inode))
1268 break;
1269
1270 if (meta_level == 0) {
1271 ocfs2_meta_unlock(inode, meta_level);
1272 meta_level = 1;
1273 continue;
1274 }
1275
1276 spin_lock(&OCFS2_I(inode)->ip_lock);
1277 clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) -
1278 OCFS2_I(inode)->ip_clusters;
1279 spin_unlock(&OCFS2_I(inode)->ip_lock);
1280
1281 mlog(0, "Writing at EOF, may need more allocation: "
Mark Fasheh215c7f92006-02-01 16:42:10 -08001282 "i_size = %lld, newsize = %lld, need %u clusters\n",
1283 (long long) i_size_read(inode), (long long) newsize,
1284 clusters);
Mark Fashehccd979b2005-12-15 14:31:24 -08001285
1286 /* We only want to continue the rest of this loop if
1287 * our extend will actually require more
1288 * allocation. */
1289 if (!clusters)
1290 break;
1291
Tiger Yang8659ac22006-10-17 18:29:52 -07001292 ret = ocfs2_extend_file(inode, NULL, newsize, count);
Mark Fashehccd979b2005-12-15 14:31:24 -08001293 if (ret < 0) {
1294 if (ret != -ENOSPC)
1295 mlog_errno(ret);
Tiger Yang8659ac22006-10-17 18:29:52 -07001296 goto out_unlock;
Mark Fashehccd979b2005-12-15 14:31:24 -08001297 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001298 break;
1299 }
1300
Tiger Yang8659ac22006-10-17 18:29:52 -07001301 if (appending)
1302 *ppos = saved_pos;
1303
1304out_unlock:
Mark Fashehccd979b2005-12-15 14:31:24 -08001305 ocfs2_meta_unlock(inode, meta_level);
Tiger Yang8659ac22006-10-17 18:29:52 -07001306
1307out:
1308 return ret;
1309}
1310
Mark Fasheh9517bac2007-02-09 20:24:12 -08001311static inline void
1312ocfs2_set_next_iovec(const struct iovec **iovp, size_t *basep, size_t bytes)
1313{
1314 const struct iovec *iov = *iovp;
1315 size_t base = *basep;
1316
1317 do {
1318 int copy = min(bytes, iov->iov_len - base);
1319
1320 bytes -= copy;
1321 base += copy;
1322 if (iov->iov_len == base) {
1323 iov++;
1324 base = 0;
1325 }
1326 } while (bytes);
1327 *iovp = iov;
1328 *basep = base;
1329}
1330
1331static struct page * ocfs2_get_write_source(struct ocfs2_buffered_write_priv *bp,
1332 const struct iovec *cur_iov,
1333 size_t iov_offset)
1334{
1335 int ret;
1336 char *buf;
1337 struct page *src_page = NULL;
1338
1339 buf = cur_iov->iov_base + iov_offset;
1340
1341 if (!segment_eq(get_fs(), KERNEL_DS)) {
1342 /*
1343 * Pull in the user page. We want to do this outside
1344 * of the meta data locks in order to preserve locking
1345 * order in case of page fault.
1346 */
1347 ret = get_user_pages(current, current->mm,
1348 (unsigned long)buf & PAGE_CACHE_MASK, 1,
1349 0, 0, &src_page, NULL);
1350 if (ret == 1)
1351 bp->b_src_buf = kmap(src_page);
1352 else
1353 src_page = ERR_PTR(-EFAULT);
1354 } else {
1355 bp->b_src_buf = buf;
1356 }
1357
1358 return src_page;
1359}
1360
1361static void ocfs2_put_write_source(struct ocfs2_buffered_write_priv *bp,
1362 struct page *page)
1363{
1364 if (page) {
1365 kunmap(page);
1366 page_cache_release(page);
1367 }
1368}
1369
1370static ssize_t ocfs2_file_buffered_write(struct file *file, loff_t *ppos,
1371 const struct iovec *iov,
1372 unsigned long nr_segs,
1373 size_t count,
1374 ssize_t o_direct_written)
1375{
1376 int ret = 0;
1377 ssize_t copied, total = 0;
1378 size_t iov_offset = 0;
1379 const struct iovec *cur_iov = iov;
1380 struct ocfs2_buffered_write_priv bp;
1381 struct page *page;
1382
1383 /*
1384 * handle partial DIO write. Adjust cur_iov if needed.
1385 */
1386 ocfs2_set_next_iovec(&cur_iov, &iov_offset, o_direct_written);
1387
1388 do {
1389 bp.b_cur_off = iov_offset;
1390 bp.b_cur_iov = cur_iov;
1391
1392 page = ocfs2_get_write_source(&bp, cur_iov, iov_offset);
1393 if (IS_ERR(page)) {
1394 ret = PTR_ERR(page);
1395 goto out;
1396 }
1397
1398 copied = ocfs2_buffered_write_cluster(file, *ppos, count,
1399 ocfs2_map_and_write_user_data,
1400 &bp);
1401
1402 ocfs2_put_write_source(&bp, page);
1403
1404 if (copied < 0) {
1405 mlog_errno(copied);
1406 ret = copied;
1407 goto out;
1408 }
1409
1410 total += copied;
1411 *ppos = *ppos + copied;
1412 count -= copied;
1413
1414 ocfs2_set_next_iovec(&cur_iov, &iov_offset, copied);
1415 } while(count);
1416
1417out:
1418 return total ? total : ret;
1419}
1420
1421static int ocfs2_check_iovec(const struct iovec *iov, size_t *counted,
1422 unsigned long *nr_segs)
1423{
1424 size_t ocount; /* original count */
1425 unsigned long seg;
1426
1427 ocount = 0;
1428 for (seg = 0; seg < *nr_segs; seg++) {
1429 const struct iovec *iv = &iov[seg];
1430
1431 /*
1432 * If any segment has a negative length, or the cumulative
1433 * length ever wraps negative then return -EINVAL.
1434 */
1435 ocount += iv->iov_len;
1436 if (unlikely((ssize_t)(ocount|iv->iov_len) < 0))
1437 return -EINVAL;
1438 if (access_ok(VERIFY_READ, iv->iov_base, iv->iov_len))
1439 continue;
1440 if (seg == 0)
1441 return -EFAULT;
1442 *nr_segs = seg;
1443 ocount -= iv->iov_len; /* This segment is no good */
1444 break;
1445 }
1446
1447 *counted = ocount;
1448 return 0;
1449}
1450
Tiger Yang8659ac22006-10-17 18:29:52 -07001451static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
1452 const struct iovec *iov,
1453 unsigned long nr_segs,
1454 loff_t pos)
1455{
Mark Fasheh9517bac2007-02-09 20:24:12 -08001456 int ret, direct_io, appending, rw_level, have_alloc_sem = 0;
1457 int can_do_direct, sync = 0;
1458 ssize_t written = 0;
1459 size_t ocount; /* original count */
1460 size_t count; /* after file limit checks */
1461 loff_t *ppos = &iocb->ki_pos;
1462 struct file *file = iocb->ki_filp;
1463 struct inode *inode = file->f_path.dentry->d_inode;
Tiger Yang8659ac22006-10-17 18:29:52 -07001464
Mark Fasheh9517bac2007-02-09 20:24:12 -08001465 mlog_entry("(0x%p, %u, '%.*s')\n", file,
Tiger Yang8659ac22006-10-17 18:29:52 -07001466 (unsigned int)nr_segs,
Mark Fasheh9517bac2007-02-09 20:24:12 -08001467 file->f_path.dentry->d_name.len,
1468 file->f_path.dentry->d_name.name);
Tiger Yang8659ac22006-10-17 18:29:52 -07001469
Tiger Yang8659ac22006-10-17 18:29:52 -07001470 if (iocb->ki_left == 0)
1471 return 0;
1472
Mark Fasheh9517bac2007-02-09 20:24:12 -08001473 ret = ocfs2_check_iovec(iov, &ocount, &nr_segs);
1474 if (ret)
1475 return ret;
1476
1477 count = ocount;
1478
1479 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
1480
1481 appending = file->f_flags & O_APPEND ? 1 : 0;
1482 direct_io = file->f_flags & O_DIRECT ? 1 : 0;
1483
Tiger Yang8659ac22006-10-17 18:29:52 -07001484 mutex_lock(&inode->i_mutex);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001485
1486relock:
Tiger Yang8659ac22006-10-17 18:29:52 -07001487 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
Mark Fasheh9517bac2007-02-09 20:24:12 -08001488 if (direct_io) {
Tiger Yang8659ac22006-10-17 18:29:52 -07001489 down_read(&inode->i_alloc_sem);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001490 have_alloc_sem = 1;
Tiger Yang8659ac22006-10-17 18:29:52 -07001491 }
1492
1493 /* concurrent O_DIRECT writes are allowed */
Mark Fasheh9517bac2007-02-09 20:24:12 -08001494 rw_level = !direct_io;
Tiger Yang8659ac22006-10-17 18:29:52 -07001495 ret = ocfs2_rw_lock(inode, rw_level);
1496 if (ret < 0) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001497 mlog_errno(ret);
1498 goto out_sems;
1499 }
1500
1501 can_do_direct = direct_io;
1502 ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos,
1503 iocb->ki_left, appending,
1504 &can_do_direct);
1505 if (ret < 0) {
Tiger Yang8659ac22006-10-17 18:29:52 -07001506 mlog_errno(ret);
1507 goto out;
1508 }
1509
Mark Fasheh9517bac2007-02-09 20:24:12 -08001510 /*
1511 * We can't complete the direct I/O as requested, fall back to
1512 * buffered I/O.
1513 */
1514 if (direct_io && !can_do_direct) {
1515 ocfs2_rw_unlock(inode, rw_level);
1516 up_read(&inode->i_alloc_sem);
1517
1518 have_alloc_sem = 0;
1519 rw_level = -1;
1520
1521 direct_io = 0;
1522 sync = 1;
1523 goto relock;
Tiger Yang8659ac22006-10-17 18:29:52 -07001524 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001525
Mark Fasheh9517bac2007-02-09 20:24:12 -08001526 if (!sync && ((file->f_flags & O_SYNC) || IS_SYNC(inode)))
1527 sync = 1;
1528
1529 /*
1530 * XXX: Is it ok to execute these checks a second time?
1531 */
1532 ret = generic_write_checks(file, ppos, &count, S_ISBLK(inode->i_mode));
1533 if (ret)
1534 goto out;
1535
1536 /*
1537 * Set pos so that sync_page_range_nolock() below understands
1538 * where to start from. We might've moved it around via the
1539 * calls above. The range we want to actually sync starts from
1540 * *ppos here.
1541 *
1542 */
1543 pos = *ppos;
1544
Mark Fashehccd979b2005-12-15 14:31:24 -08001545 /* communicate with ocfs2_dio_end_io */
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -07001546 ocfs2_iocb_set_rw_locked(iocb, rw_level);
Mark Fashehccd979b2005-12-15 14:31:24 -08001547
Mark Fasheh9517bac2007-02-09 20:24:12 -08001548 if (direct_io) {
1549 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
1550 ppos, count, ocount);
1551 if (written < 0) {
1552 ret = written;
1553 goto out_dio;
1554 }
1555 } else {
1556 written = ocfs2_file_buffered_write(file, ppos, iov, nr_segs,
1557 count, written);
1558 if (written < 0) {
1559 ret = written;
1560 if (ret != -EFAULT || ret != -ENOSPC)
1561 mlog_errno(ret);
1562 goto out;
1563 }
1564 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001565
Mark Fasheh9517bac2007-02-09 20:24:12 -08001566out_dio:
Mark Fashehccd979b2005-12-15 14:31:24 -08001567 /* buffered aio wouldn't have proper lock coverage today */
Mark Fasheh9517bac2007-02-09 20:24:12 -08001568 BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
Mark Fashehccd979b2005-12-15 14:31:24 -08001569
1570 /*
1571 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
1572 * function pointer which is called when o_direct io completes so that
1573 * it can unlock our rw lock. (it's the clustered equivalent of
1574 * i_alloc_sem; protects truncate from racing with pending ios).
1575 * Unfortunately there are error cases which call end_io and others
1576 * that don't. so we don't have to unlock the rw_lock if either an
1577 * async dio is going to do it in the future or an end_io after an
1578 * error has already done it.
1579 */
1580 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1581 rw_level = -1;
1582 have_alloc_sem = 0;
1583 }
1584
1585out:
Mark Fasheh9517bac2007-02-09 20:24:12 -08001586 if (rw_level != -1)
1587 ocfs2_rw_unlock(inode, rw_level);
1588
1589out_sems:
Mark Fashehccd979b2005-12-15 14:31:24 -08001590 if (have_alloc_sem)
1591 up_read(&inode->i_alloc_sem);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001592
1593 if (written > 0 && sync) {
1594 ssize_t err;
1595
1596 err = sync_page_range_nolock(inode, file->f_mapping, pos, count);
1597 if (err < 0)
1598 written = err;
1599 }
1600
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001601 mutex_unlock(&inode->i_mutex);
Mark Fashehccd979b2005-12-15 14:31:24 -08001602
1603 mlog_exit(ret);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001604 return written ? written : ret;
Mark Fashehccd979b2005-12-15 14:31:24 -08001605}
1606
Mark Fasheh6af67d82007-03-06 17:24:46 -08001607static int ocfs2_splice_write_actor(struct pipe_inode_info *pipe,
1608 struct pipe_buffer *buf,
1609 struct splice_desc *sd)
1610{
1611 int ret, count, total = 0;
1612 ssize_t copied = 0;
1613 struct ocfs2_splice_write_priv sp;
1614
1615 ret = buf->ops->pin(pipe, buf);
1616 if (ret)
1617 goto out;
1618
1619 sp.s_sd = sd;
1620 sp.s_buf = buf;
1621 sp.s_pipe = pipe;
1622 sp.s_offset = sd->pos & ~PAGE_CACHE_MASK;
1623 sp.s_buf_offset = buf->offset;
1624
1625 count = sd->len;
1626 if (count + sp.s_offset > PAGE_CACHE_SIZE)
1627 count = PAGE_CACHE_SIZE - sp.s_offset;
1628
1629 do {
1630 /*
1631 * splice wants us to copy up to one page at a
1632 * time. For pagesize > cluster size, this means we
1633 * might enter ocfs2_buffered_write_cluster() more
1634 * than once, so keep track of our progress here.
1635 */
1636 copied = ocfs2_buffered_write_cluster(sd->file,
1637 (loff_t)sd->pos + total,
1638 count,
1639 ocfs2_map_and_write_splice_data,
1640 &sp);
1641 if (copied < 0) {
1642 mlog_errno(copied);
1643 ret = copied;
1644 goto out;
1645 }
1646
1647 count -= copied;
1648 sp.s_offset += copied;
1649 sp.s_buf_offset += copied;
1650 total += copied;
1651 } while (count);
1652
1653 ret = 0;
1654out:
1655
1656 return total ? total : ret;
1657}
1658
1659static ssize_t __ocfs2_file_splice_write(struct pipe_inode_info *pipe,
1660 struct file *out,
1661 loff_t *ppos,
1662 size_t len,
1663 unsigned int flags)
1664{
1665 int ret, err;
1666 struct address_space *mapping = out->f_mapping;
1667 struct inode *inode = mapping->host;
1668
1669 ret = __splice_from_pipe(pipe, out, ppos, len, flags,
1670 ocfs2_splice_write_actor);
1671 if (ret > 0) {
1672 *ppos += ret;
1673
1674 if (unlikely((out->f_flags & O_SYNC) || IS_SYNC(inode))) {
1675 err = generic_osync_inode(inode, mapping,
1676 OSYNC_METADATA|OSYNC_DATA);
1677 if (err)
1678 ret = err;
1679 }
1680 }
1681
1682 return ret;
1683}
1684
Tiger Yang8659ac22006-10-17 18:29:52 -07001685static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
1686 struct file *out,
1687 loff_t *ppos,
1688 size_t len,
1689 unsigned int flags)
1690{
1691 int ret;
Josef Sipekd28c9172006-12-08 02:37:25 -08001692 struct inode *inode = out->f_path.dentry->d_inode;
Tiger Yang8659ac22006-10-17 18:29:52 -07001693
1694 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
1695 (unsigned int)len,
Josef Sipekd28c9172006-12-08 02:37:25 -08001696 out->f_path.dentry->d_name.len,
1697 out->f_path.dentry->d_name.name);
Tiger Yang8659ac22006-10-17 18:29:52 -07001698
1699 inode_double_lock(inode, pipe->inode);
1700
1701 ret = ocfs2_rw_lock(inode, 1);
1702 if (ret < 0) {
1703 mlog_errno(ret);
1704 goto out;
1705 }
1706
Mark Fasheh9517bac2007-02-09 20:24:12 -08001707 ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, ppos, len, 0,
1708 NULL);
Tiger Yang8659ac22006-10-17 18:29:52 -07001709 if (ret < 0) {
1710 mlog_errno(ret);
1711 goto out_unlock;
1712 }
1713
1714 /* ok, we're done with i_size and alloc work */
Mark Fasheh6af67d82007-03-06 17:24:46 -08001715 ret = __ocfs2_file_splice_write(pipe, out, ppos, len, flags);
Tiger Yang8659ac22006-10-17 18:29:52 -07001716
1717out_unlock:
1718 ocfs2_rw_unlock(inode, 1);
1719out:
1720 inode_double_unlock(inode, pipe->inode);
1721
1722 mlog_exit(ret);
1723 return ret;
1724}
1725
1726static ssize_t ocfs2_file_splice_read(struct file *in,
1727 loff_t *ppos,
1728 struct pipe_inode_info *pipe,
1729 size_t len,
1730 unsigned int flags)
1731{
1732 int ret = 0;
Josef Sipekd28c9172006-12-08 02:37:25 -08001733 struct inode *inode = in->f_path.dentry->d_inode;
Tiger Yang8659ac22006-10-17 18:29:52 -07001734
1735 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
1736 (unsigned int)len,
Josef Sipekd28c9172006-12-08 02:37:25 -08001737 in->f_path.dentry->d_name.len,
1738 in->f_path.dentry->d_name.name);
Tiger Yang8659ac22006-10-17 18:29:52 -07001739
1740 /*
1741 * See the comment in ocfs2_file_aio_read()
1742 */
1743 ret = ocfs2_meta_lock(inode, NULL, 0);
1744 if (ret < 0) {
1745 mlog_errno(ret);
1746 goto bail;
1747 }
1748 ocfs2_meta_unlock(inode, 0);
1749
1750 ret = generic_file_splice_read(in, ppos, pipe, len, flags);
1751
1752bail:
1753 mlog_exit(ret);
1754 return ret;
1755}
1756
Mark Fashehccd979b2005-12-15 14:31:24 -08001757static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -07001758 const struct iovec *iov,
1759 unsigned long nr_segs,
Mark Fashehccd979b2005-12-15 14:31:24 -08001760 loff_t pos)
1761{
Tiger Yang25899de2006-11-15 15:49:02 +08001762 int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -08001763 struct file *filp = iocb->ki_filp;
Josef Sipekd28c9172006-12-08 02:37:25 -08001764 struct inode *inode = filp->f_path.dentry->d_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -08001765
Badari Pulavarty027445c2006-09-30 23:28:46 -07001766 mlog_entry("(0x%p, %u, '%.*s')\n", filp,
1767 (unsigned int)nr_segs,
Josef Sipekd28c9172006-12-08 02:37:25 -08001768 filp->f_path.dentry->d_name.len,
1769 filp->f_path.dentry->d_name.name);
Mark Fashehccd979b2005-12-15 14:31:24 -08001770
1771 if (!inode) {
1772 ret = -EINVAL;
1773 mlog_errno(ret);
1774 goto bail;
1775 }
1776
Mark Fashehccd979b2005-12-15 14:31:24 -08001777 /*
1778 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
1779 * need locks to protect pending reads from racing with truncate.
1780 */
1781 if (filp->f_flags & O_DIRECT) {
1782 down_read(&inode->i_alloc_sem);
1783 have_alloc_sem = 1;
1784
1785 ret = ocfs2_rw_lock(inode, 0);
1786 if (ret < 0) {
1787 mlog_errno(ret);
1788 goto bail;
1789 }
1790 rw_level = 0;
1791 /* communicate with ocfs2_dio_end_io */
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -07001792 ocfs2_iocb_set_rw_locked(iocb, rw_level);
Mark Fashehccd979b2005-12-15 14:31:24 -08001793 }
1794
Mark Fashehc4374f82006-05-05 19:04:35 -07001795 /*
1796 * We're fine letting folks race truncates and extending
1797 * writes with read across the cluster, just like they can
1798 * locally. Hence no rw_lock during read.
1799 *
1800 * Take and drop the meta data lock to update inode fields
1801 * like i_size. This allows the checks down below
1802 * generic_file_aio_read() a chance of actually working.
1803 */
Tiger Yang25899de2006-11-15 15:49:02 +08001804 ret = ocfs2_meta_lock_atime(inode, filp->f_vfsmnt, &lock_level);
Mark Fashehc4374f82006-05-05 19:04:35 -07001805 if (ret < 0) {
1806 mlog_errno(ret);
1807 goto bail;
1808 }
Tiger Yang25899de2006-11-15 15:49:02 +08001809 ocfs2_meta_unlock(inode, lock_level);
Mark Fashehc4374f82006-05-05 19:04:35 -07001810
Badari Pulavarty027445c2006-09-30 23:28:46 -07001811 ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
Mark Fashehccd979b2005-12-15 14:31:24 -08001812 if (ret == -EINVAL)
1813 mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n");
1814
1815 /* buffered aio wouldn't have proper lock coverage today */
1816 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
1817
1818 /* see ocfs2_file_aio_write */
1819 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1820 rw_level = -1;
1821 have_alloc_sem = 0;
1822 }
1823
1824bail:
1825 if (have_alloc_sem)
1826 up_read(&inode->i_alloc_sem);
1827 if (rw_level != -1)
1828 ocfs2_rw_unlock(inode, rw_level);
1829 mlog_exit(ret);
1830
1831 return ret;
1832}
1833
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08001834const struct inode_operations ocfs2_file_iops = {
Mark Fashehccd979b2005-12-15 14:31:24 -08001835 .setattr = ocfs2_setattr,
1836 .getattr = ocfs2_getattr,
Tiger Yangd38eb8d2006-11-27 09:59:21 +08001837 .permission = ocfs2_permission,
Mark Fashehccd979b2005-12-15 14:31:24 -08001838};
1839
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08001840const struct inode_operations ocfs2_special_file_iops = {
Mark Fashehccd979b2005-12-15 14:31:24 -08001841 .setattr = ocfs2_setattr,
1842 .getattr = ocfs2_getattr,
Tiger Yangd38eb8d2006-11-27 09:59:21 +08001843 .permission = ocfs2_permission,
Mark Fashehccd979b2005-12-15 14:31:24 -08001844};
1845
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001846const struct file_operations ocfs2_fops = {
Mark Fashehccd979b2005-12-15 14:31:24 -08001847 .read = do_sync_read,
1848 .write = do_sync_write,
1849 .sendfile = generic_file_sendfile,
1850 .mmap = ocfs2_mmap,
1851 .fsync = ocfs2_sync_file,
1852 .release = ocfs2_file_release,
1853 .open = ocfs2_file_open,
1854 .aio_read = ocfs2_file_aio_read,
1855 .aio_write = ocfs2_file_aio_write,
Herbert Poetzlca4d1472006-07-03 17:27:12 -07001856 .ioctl = ocfs2_ioctl,
Mark Fasheh586d2322007-03-09 15:56:28 -08001857#ifdef CONFIG_COMPAT
1858 .compat_ioctl = ocfs2_compat_ioctl,
1859#endif
Tiger Yang8659ac22006-10-17 18:29:52 -07001860 .splice_read = ocfs2_file_splice_read,
1861 .splice_write = ocfs2_file_splice_write,
Mark Fashehccd979b2005-12-15 14:31:24 -08001862};
1863
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001864const struct file_operations ocfs2_dops = {
Mark Fashehccd979b2005-12-15 14:31:24 -08001865 .read = generic_read_dir,
1866 .readdir = ocfs2_readdir,
1867 .fsync = ocfs2_sync_file,
Herbert Poetzlca4d1472006-07-03 17:27:12 -07001868 .ioctl = ocfs2_ioctl,
Mark Fasheh586d2322007-03-09 15:56:28 -08001869#ifdef CONFIG_COMPAT
1870 .compat_ioctl = ocfs2_compat_ioctl,
1871#endif
Mark Fashehccd979b2005-12-15 14:31:24 -08001872};