blob: 581eb451a41a36796a2a2d55b7463028d4dae10e [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>
33
34#define MLOG_MASK_PREFIX ML_INODE
35#include <cluster/masklog.h>
36
37#include "ocfs2.h"
38
39#include "alloc.h"
40#include "aops.h"
41#include "dir.h"
42#include "dlmglue.h"
43#include "extent_map.h"
44#include "file.h"
45#include "sysfile.h"
46#include "inode.h"
47#include "journal.h"
48#include "mmap.h"
49#include "suballoc.h"
50#include "super.h"
51
52#include "buffer_head_io.h"
53
54static int ocfs2_sync_inode(struct inode *inode)
55{
56 filemap_fdatawrite(inode->i_mapping);
57 return sync_mapping_buffers(inode->i_mapping);
58}
59
60static int ocfs2_file_open(struct inode *inode, struct file *file)
61{
62 int status;
63 int mode = file->f_flags;
64 struct ocfs2_inode_info *oi = OCFS2_I(inode);
65
66 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
67 file->f_dentry->d_name.len, file->f_dentry->d_name.name);
68
69 spin_lock(&oi->ip_lock);
70
71 /* Check that the inode hasn't been wiped from disk by another
72 * node. If it hasn't then we're safe as long as we hold the
73 * spin lock until our increment of open count. */
74 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
75 spin_unlock(&oi->ip_lock);
76
77 status = -ENOENT;
78 goto leave;
79 }
80
81 if (mode & O_DIRECT)
82 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
83
84 oi->ip_open_count++;
85 spin_unlock(&oi->ip_lock);
86 status = 0;
87leave:
88 mlog_exit(status);
89 return status;
90}
91
92static int ocfs2_file_release(struct inode *inode, struct file *file)
93{
94 struct ocfs2_inode_info *oi = OCFS2_I(inode);
95
96 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
97 file->f_dentry->d_name.len,
98 file->f_dentry->d_name.name);
99
100 spin_lock(&oi->ip_lock);
101 if (!--oi->ip_open_count)
102 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
103 spin_unlock(&oi->ip_lock);
104
105 mlog_exit(0);
106
107 return 0;
108}
109
110static int ocfs2_sync_file(struct file *file,
111 struct dentry *dentry,
112 int datasync)
113{
114 int err = 0;
115 journal_t *journal;
116 struct inode *inode = dentry->d_inode;
117 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
118
119 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync,
120 dentry->d_name.len, dentry->d_name.name);
121
122 err = ocfs2_sync_inode(dentry->d_inode);
123 if (err)
124 goto bail;
125
126 journal = osb->journal->j_journal;
127 err = journal_force_commit(journal);
128
129bail:
130 mlog_exit(err);
131
132 return (err < 0) ? -EIO : 0;
133}
134
135int ocfs2_set_inode_size(struct ocfs2_journal_handle *handle,
136 struct inode *inode,
137 struct buffer_head *fe_bh,
138 u64 new_i_size)
139{
140 int status;
141
142 mlog_entry_void();
143 i_size_write(inode, new_i_size);
144 inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size);
145 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
146
147 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
148 if (status < 0) {
149 mlog_errno(status);
150 goto bail;
151 }
152
153bail:
154 mlog_exit(status);
155 return status;
156}
157
158static int ocfs2_simple_size_update(struct inode *inode,
159 struct buffer_head *di_bh,
160 u64 new_i_size)
161{
162 int ret;
163 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
164 struct ocfs2_journal_handle *handle = NULL;
165
166 handle = ocfs2_start_trans(osb, NULL,
167 OCFS2_INODE_UPDATE_CREDITS);
168 if (handle == NULL) {
169 ret = -ENOMEM;
170 mlog_errno(ret);
171 goto out;
172 }
173
174 ret = ocfs2_set_inode_size(handle, inode, di_bh,
175 new_i_size);
176 if (ret < 0)
177 mlog_errno(ret);
178
179 ocfs2_commit_trans(handle);
180out:
181 return ret;
182}
183
184static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
185 struct inode *inode,
186 struct buffer_head *fe_bh,
187 u64 new_i_size)
188{
189 int status;
190 struct ocfs2_journal_handle *handle;
191
192 mlog_entry_void();
193
194 /* TODO: This needs to actually orphan the inode in this
195 * transaction. */
196
197 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
198 if (IS_ERR(handle)) {
199 status = PTR_ERR(handle);
200 mlog_errno(status);
201 goto out;
202 }
203
204 status = ocfs2_set_inode_size(handle, inode, fe_bh, new_i_size);
205 if (status < 0)
206 mlog_errno(status);
207
208 ocfs2_commit_trans(handle);
209out:
210 mlog_exit(status);
211 return status;
212}
213
214static int ocfs2_truncate_file(struct inode *inode,
215 struct buffer_head *di_bh,
216 u64 new_i_size)
217{
218 int status = 0;
219 struct ocfs2_dinode *fe = NULL;
220 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
221 struct ocfs2_truncate_context *tc = NULL;
222
Mark Fashehb0697052006-03-03 10:24:33 -0800223 mlog_entry("(inode = %llu, new_i_size = %llu\n",
224 (unsigned long long)OCFS2_I(inode)->ip_blkno,
225 (unsigned long long)new_i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -0800226
227 truncate_inode_pages(inode->i_mapping, new_i_size);
228
229 fe = (struct ocfs2_dinode *) di_bh->b_data;
230 if (!OCFS2_IS_VALID_DINODE(fe)) {
231 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
232 status = -EIO;
233 goto bail;
234 }
235
236 mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
Mark Fashehb0697052006-03-03 10:24:33 -0800237 "Inode %llu, inode i_size = %lld != di "
238 "i_size = %llu, i_flags = 0x%x\n",
239 (unsigned long long)OCFS2_I(inode)->ip_blkno,
Mark Fashehccd979b2005-12-15 14:31:24 -0800240 i_size_read(inode),
Mark Fashehb0697052006-03-03 10:24:33 -0800241 (unsigned long long)le64_to_cpu(fe->i_size),
242 le32_to_cpu(fe->i_flags));
Mark Fashehccd979b2005-12-15 14:31:24 -0800243
244 if (new_i_size > le64_to_cpu(fe->i_size)) {
Mark Fashehb0697052006-03-03 10:24:33 -0800245 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
246 (unsigned long long)le64_to_cpu(fe->i_size),
247 (unsigned long long)new_i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -0800248 status = -EINVAL;
249 mlog_errno(status);
250 goto bail;
251 }
252
Mark Fashehb0697052006-03-03 10:24:33 -0800253 mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
254 (unsigned long long)le64_to_cpu(fe->i_blkno),
255 (unsigned long long)le64_to_cpu(fe->i_size),
256 (unsigned long long)new_i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -0800257
258 /* lets handle the simple truncate cases before doing any more
259 * cluster locking. */
260 if (new_i_size == le64_to_cpu(fe->i_size))
261 goto bail;
262
Mark Fashehab0920c2006-03-16 15:06:37 -0800263 /* This forces other nodes to sync and drop their pages. Do
264 * this even if we have a truncate without allocation change -
265 * ocfs2 cluster sizes can be much greater than page size, so
266 * we have to truncate them anyway. */
267 status = ocfs2_data_lock(inode, 1);
268 if (status < 0) {
269 mlog_errno(status);
270 goto bail;
271 }
272 ocfs2_data_unlock(inode, 1);
273
Mark Fashehccd979b2005-12-15 14:31:24 -0800274 if (le32_to_cpu(fe->i_clusters) ==
275 ocfs2_clusters_for_bytes(osb->sb, new_i_size)) {
276 mlog(0, "fe->i_clusters = %u, so we do a simple truncate\n",
277 fe->i_clusters);
278 /* No allocation change is required, so lets fast path
279 * this truncate. */
280 status = ocfs2_simple_size_update(inode, di_bh, new_i_size);
281 if (status < 0)
282 mlog_errno(status);
283 goto bail;
284 }
285
Mark Fashehccd979b2005-12-15 14:31:24 -0800286 /* alright, we're going to need to do a full blown alloc size
287 * change. Orphan the inode so that recovery can complete the
288 * truncate if necessary. This does the task of marking
289 * i_size. */
290 status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
291 if (status < 0) {
292 mlog_errno(status);
293 goto bail;
294 }
295
296 status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
297 if (status < 0) {
298 mlog_errno(status);
299 goto bail;
300 }
301
302 status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
303 if (status < 0) {
304 mlog_errno(status);
305 goto bail;
306 }
307
308 /* TODO: orphan dir cleanup here. */
309bail:
310
311 mlog_exit(status);
312 return status;
313}
314
315/*
316 * extend allocation only here.
317 * we'll update all the disk stuff, and oip->alloc_size
318 *
319 * expect stuff to be locked, a transaction started and enough data /
320 * metadata reservations in the contexts.
321 *
322 * Will return -EAGAIN, and a reason if a restart is needed.
323 * If passed in, *reason will always be set, even in error.
324 */
325int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
326 struct inode *inode,
327 u32 clusters_to_add,
328 struct buffer_head *fe_bh,
329 struct ocfs2_journal_handle *handle,
330 struct ocfs2_alloc_context *data_ac,
331 struct ocfs2_alloc_context *meta_ac,
332 enum ocfs2_alloc_restarted *reason_ret)
333{
334 int status = 0;
335 int free_extents;
336 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
337 enum ocfs2_alloc_restarted reason = RESTART_NONE;
338 u32 bit_off, num_bits;
339 u64 block;
340
341 BUG_ON(!clusters_to_add);
342
343 free_extents = ocfs2_num_free_extents(osb, inode, fe);
344 if (free_extents < 0) {
345 status = free_extents;
346 mlog_errno(status);
347 goto leave;
348 }
349
350 /* there are two cases which could cause us to EAGAIN in the
351 * we-need-more-metadata case:
352 * 1) we haven't reserved *any*
353 * 2) we are so fragmented, we've needed to add metadata too
354 * many times. */
355 if (!free_extents && !meta_ac) {
356 mlog(0, "we haven't reserved any metadata!\n");
357 status = -EAGAIN;
358 reason = RESTART_META;
359 goto leave;
360 } else if ((!free_extents)
361 && (ocfs2_alloc_context_bits_left(meta_ac)
362 < ocfs2_extend_meta_needed(fe))) {
363 mlog(0, "filesystem is really fragmented...\n");
364 status = -EAGAIN;
365 reason = RESTART_META;
366 goto leave;
367 }
368
369 status = ocfs2_claim_clusters(osb, handle, data_ac, 1,
370 &bit_off, &num_bits);
371 if (status < 0) {
372 if (status != -ENOSPC)
373 mlog_errno(status);
374 goto leave;
375 }
376
377 BUG_ON(num_bits > clusters_to_add);
378
379 /* reserve our write early -- insert_extent may update the inode */
380 status = ocfs2_journal_access(handle, inode, fe_bh,
381 OCFS2_JOURNAL_ACCESS_WRITE);
382 if (status < 0) {
383 mlog_errno(status);
384 goto leave;
385 }
386
387 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
Mark Fashehb0697052006-03-03 10:24:33 -0800388 mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
389 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800390 status = ocfs2_insert_extent(osb, handle, inode, fe_bh, block,
391 num_bits, meta_ac);
392 if (status < 0) {
393 mlog_errno(status);
394 goto leave;
395 }
396
397 le32_add_cpu(&fe->i_clusters, num_bits);
398 spin_lock(&OCFS2_I(inode)->ip_lock);
399 OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
400 spin_unlock(&OCFS2_I(inode)->ip_lock);
401
402 status = ocfs2_journal_dirty(handle, fe_bh);
403 if (status < 0) {
404 mlog_errno(status);
405 goto leave;
406 }
407
408 clusters_to_add -= num_bits;
409
410 if (clusters_to_add) {
411 mlog(0, "need to alloc once more, clusters = %u, wanted = "
412 "%u\n", fe->i_clusters, clusters_to_add);
413 status = -EAGAIN;
414 reason = RESTART_TRANS;
415 }
416
417leave:
418 mlog_exit(status);
419 if (reason_ret)
420 *reason_ret = reason;
421 return status;
422}
423
424static int ocfs2_extend_allocation(struct inode *inode,
425 u32 clusters_to_add)
426{
427 int status = 0;
428 int restart_func = 0;
429 int drop_alloc_sem = 0;
430 int credits, num_free_extents;
431 u32 prev_clusters;
432 struct buffer_head *bh = NULL;
433 struct ocfs2_dinode *fe = NULL;
434 struct ocfs2_journal_handle *handle = NULL;
435 struct ocfs2_alloc_context *data_ac = NULL;
436 struct ocfs2_alloc_context *meta_ac = NULL;
437 enum ocfs2_alloc_restarted why;
438 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
439
440 mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
441
442 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
443 OCFS2_BH_CACHED, inode);
444 if (status < 0) {
445 mlog_errno(status);
446 goto leave;
447 }
448
449 fe = (struct ocfs2_dinode *) bh->b_data;
450 if (!OCFS2_IS_VALID_DINODE(fe)) {
451 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
452 status = -EIO;
453 goto leave;
454 }
455
456restart_all:
457 BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
458
Mark Fashehb0697052006-03-03 10:24:33 -0800459 mlog(0, "extend inode %llu, i_size = %lld, fe->i_clusters = %u, "
Mark Fashehccd979b2005-12-15 14:31:24 -0800460 "clusters_to_add = %u\n",
Mark Fashehb0697052006-03-03 10:24:33 -0800461 (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode),
Mark Fashehccd979b2005-12-15 14:31:24 -0800462 fe->i_clusters, clusters_to_add);
463
464 handle = ocfs2_alloc_handle(osb);
465 if (handle == NULL) {
466 status = -ENOMEM;
467 mlog_errno(status);
468 goto leave;
469 }
470
471 num_free_extents = ocfs2_num_free_extents(osb,
472 inode,
473 fe);
474 if (num_free_extents < 0) {
475 status = num_free_extents;
476 mlog_errno(status);
477 goto leave;
478 }
479
480 if (!num_free_extents) {
481 status = ocfs2_reserve_new_metadata(osb,
482 handle,
483 fe,
484 &meta_ac);
485 if (status < 0) {
486 if (status != -ENOSPC)
487 mlog_errno(status);
488 goto leave;
489 }
490 }
491
492 status = ocfs2_reserve_clusters(osb,
493 handle,
494 clusters_to_add,
495 &data_ac);
496 if (status < 0) {
497 if (status != -ENOSPC)
498 mlog_errno(status);
499 goto leave;
500 }
501
502 /* blocks peope in read/write from reading our allocation
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800503 * until we're done changing it. We depend on i_mutex to block
Mark Fashehccd979b2005-12-15 14:31:24 -0800504 * other extend/truncate calls while we're here. Ordering wrt
505 * start_trans is important here -- always do it before! */
506 down_write(&OCFS2_I(inode)->ip_alloc_sem);
507 drop_alloc_sem = 1;
508
509 credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
510 handle = ocfs2_start_trans(osb, handle, credits);
511 if (IS_ERR(handle)) {
512 status = PTR_ERR(handle);
513 handle = NULL;
514 mlog_errno(status);
515 goto leave;
516 }
517
518restarted_transaction:
519 /* reserve a write to the file entry early on - that we if we
520 * run out of credits in the allocation path, we can still
521 * update i_size. */
522 status = ocfs2_journal_access(handle, inode, bh,
523 OCFS2_JOURNAL_ACCESS_WRITE);
524 if (status < 0) {
525 mlog_errno(status);
526 goto leave;
527 }
528
529 prev_clusters = OCFS2_I(inode)->ip_clusters;
530
531 status = ocfs2_do_extend_allocation(osb,
532 inode,
533 clusters_to_add,
534 bh,
535 handle,
536 data_ac,
537 meta_ac,
538 &why);
539 if ((status < 0) && (status != -EAGAIN)) {
540 if (status != -ENOSPC)
541 mlog_errno(status);
542 goto leave;
543 }
544
545 status = ocfs2_journal_dirty(handle, bh);
546 if (status < 0) {
547 mlog_errno(status);
548 goto leave;
549 }
550
551 spin_lock(&OCFS2_I(inode)->ip_lock);
552 clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
553 spin_unlock(&OCFS2_I(inode)->ip_lock);
554
555 if (why != RESTART_NONE && clusters_to_add) {
556 if (why == RESTART_META) {
557 mlog(0, "restarting function.\n");
558 restart_func = 1;
559 } else {
560 BUG_ON(why != RESTART_TRANS);
561
562 mlog(0, "restarting transaction.\n");
563 /* TODO: This can be more intelligent. */
564 credits = ocfs2_calc_extend_credits(osb->sb,
565 fe,
566 clusters_to_add);
567 status = ocfs2_extend_trans(handle, credits);
568 if (status < 0) {
569 /* handle still has to be committed at
570 * this point. */
571 status = -ENOMEM;
572 mlog_errno(status);
573 goto leave;
574 }
575 goto restarted_transaction;
576 }
577 }
578
Mark Fashehb0697052006-03-03 10:24:33 -0800579 mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
580 fe->i_clusters, (unsigned long long)fe->i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -0800581 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
582 OCFS2_I(inode)->ip_clusters, i_size_read(inode));
583
584leave:
585 if (drop_alloc_sem) {
586 up_write(&OCFS2_I(inode)->ip_alloc_sem);
587 drop_alloc_sem = 0;
588 }
589 if (handle) {
590 ocfs2_commit_trans(handle);
591 handle = NULL;
592 }
593 if (data_ac) {
594 ocfs2_free_alloc_context(data_ac);
595 data_ac = NULL;
596 }
597 if (meta_ac) {
598 ocfs2_free_alloc_context(meta_ac);
599 meta_ac = NULL;
600 }
601 if ((!status) && restart_func) {
602 restart_func = 0;
603 goto restart_all;
604 }
605 if (bh) {
606 brelse(bh);
607 bh = NULL;
608 }
609
610 mlog_exit(status);
611 return status;
612}
613
614/* Some parts of this taken from generic_cont_expand, which turned out
615 * to be too fragile to do exactly what we need without us having to
616 * worry about recursive locking in ->commit_write(). */
617static int ocfs2_write_zero_page(struct inode *inode,
618 u64 size)
619{
620 struct address_space *mapping = inode->i_mapping;
621 struct page *page;
622 unsigned long index;
623 unsigned int offset;
624 struct ocfs2_journal_handle *handle = NULL;
625 int ret;
626
627 offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
628 /* ugh. in prepare/commit_write, if from==to==start of block, we
629 ** skip the prepare. make sure we never send an offset for the start
630 ** of a block
631 */
632 if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
633 offset++;
634 }
635 index = size >> PAGE_CACHE_SHIFT;
636
637 page = grab_cache_page(mapping, index);
638 if (!page) {
639 ret = -ENOMEM;
640 mlog_errno(ret);
641 goto out;
642 }
643
644 ret = ocfs2_prepare_write(NULL, page, offset, offset);
645 if (ret < 0) {
646 mlog_errno(ret);
647 goto out_unlock;
648 }
649
650 if (ocfs2_should_order_data(inode)) {
651 handle = ocfs2_start_walk_page_trans(inode, page, offset,
652 offset);
653 if (IS_ERR(handle)) {
654 ret = PTR_ERR(handle);
655 handle = NULL;
656 goto out_unlock;
657 }
658 }
659
660 /* must not update i_size! */
661 ret = block_commit_write(page, offset, offset);
662 if (ret < 0)
663 mlog_errno(ret);
664 else
665 ret = 0;
666
667 if (handle)
668 ocfs2_commit_trans(handle);
669out_unlock:
670 unlock_page(page);
671 page_cache_release(page);
672out:
673 return ret;
674}
675
676static int ocfs2_zero_extend(struct inode *inode,
677 u64 zero_to_size)
678{
679 int ret = 0;
680 u64 start_off;
681 struct super_block *sb = inode->i_sb;
682
683 start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
684 while (start_off < zero_to_size) {
685 ret = ocfs2_write_zero_page(inode, start_off);
686 if (ret < 0) {
687 mlog_errno(ret);
688 goto out;
689 }
690
691 start_off += sb->s_blocksize;
692 }
693
694out:
695 return ret;
696}
697
698static int ocfs2_extend_file(struct inode *inode,
699 struct buffer_head *di_bh,
700 u64 new_i_size)
701{
702 int ret = 0;
703 u32 clusters_to_add;
704
705 /* setattr sometimes calls us like this. */
706 if (new_i_size == 0)
707 goto out;
708
709 if (i_size_read(inode) == new_i_size)
710 goto out;
711 BUG_ON(new_i_size < i_size_read(inode));
712
713 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) -
714 OCFS2_I(inode)->ip_clusters;
715
716 if (clusters_to_add) {
717 ret = ocfs2_extend_allocation(inode, clusters_to_add);
718 if (ret < 0) {
719 mlog_errno(ret);
720 goto out;
721 }
722
723 ret = ocfs2_zero_extend(inode, new_i_size);
724 if (ret < 0) {
725 mlog_errno(ret);
726 goto out;
727 }
728 }
729
730 /* No allocation required, we just use this helper to
731 * do a trivial update of i_size. */
732 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
733 if (ret < 0) {
734 mlog_errno(ret);
735 goto out;
736 }
737
738out:
739 return ret;
740}
741
742int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
743{
744 int status = 0, size_change;
745 struct inode *inode = dentry->d_inode;
746 struct super_block *sb = inode->i_sb;
747 struct ocfs2_super *osb = OCFS2_SB(sb);
748 struct buffer_head *bh = NULL;
749 struct ocfs2_journal_handle *handle = NULL;
750
751 mlog_entry("(0x%p, '%.*s')\n", dentry,
752 dentry->d_name.len, dentry->d_name.name);
753
754 if (attr->ia_valid & ATTR_MODE)
755 mlog(0, "mode change: %d\n", attr->ia_mode);
756 if (attr->ia_valid & ATTR_UID)
757 mlog(0, "uid change: %d\n", attr->ia_uid);
758 if (attr->ia_valid & ATTR_GID)
759 mlog(0, "gid change: %d\n", attr->ia_gid);
760 if (attr->ia_valid & ATTR_SIZE)
761 mlog(0, "size change...\n");
762 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
763 mlog(0, "time change...\n");
764
765#define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
766 | ATTR_GID | ATTR_UID | ATTR_MODE)
767 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
768 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
769 return 0;
770 }
771
772 status = inode_change_ok(inode, attr);
773 if (status)
774 return status;
775
776 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
777 if (size_change) {
778 status = ocfs2_rw_lock(inode, 1);
779 if (status < 0) {
780 mlog_errno(status);
781 goto bail;
782 }
783 }
784
785 status = ocfs2_meta_lock(inode, NULL, &bh, 1);
786 if (status < 0) {
787 if (status != -ENOENT)
788 mlog_errno(status);
789 goto bail_unlock_rw;
790 }
791
792 if (size_change && attr->ia_size != i_size_read(inode)) {
793 if (i_size_read(inode) > attr->ia_size)
794 status = ocfs2_truncate_file(inode, bh, attr->ia_size);
795 else
796 status = ocfs2_extend_file(inode, bh, attr->ia_size);
797 if (status < 0) {
798 if (status != -ENOSPC)
799 mlog_errno(status);
800 status = -ENOSPC;
801 goto bail_unlock;
802 }
803 }
804
805 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
806 if (IS_ERR(handle)) {
807 status = PTR_ERR(handle);
808 mlog_errno(status);
809 goto bail_unlock;
810 }
811
812 status = inode_setattr(inode, attr);
813 if (status < 0) {
814 mlog_errno(status);
815 goto bail_commit;
816 }
817
818 status = ocfs2_mark_inode_dirty(handle, inode, bh);
819 if (status < 0)
820 mlog_errno(status);
821
822bail_commit:
823 ocfs2_commit_trans(handle);
824bail_unlock:
825 ocfs2_meta_unlock(inode, 1);
826bail_unlock_rw:
827 if (size_change)
828 ocfs2_rw_unlock(inode, 1);
829bail:
830 if (bh)
831 brelse(bh);
832
833 mlog_exit(status);
834 return status;
835}
836
837int ocfs2_getattr(struct vfsmount *mnt,
838 struct dentry *dentry,
839 struct kstat *stat)
840{
841 struct inode *inode = dentry->d_inode;
842 struct super_block *sb = dentry->d_inode->i_sb;
843 struct ocfs2_super *osb = sb->s_fs_info;
844 int err;
845
846 mlog_entry_void();
847
848 err = ocfs2_inode_revalidate(dentry);
849 if (err) {
850 if (err != -ENOENT)
851 mlog_errno(err);
852 goto bail;
853 }
854
855 generic_fillattr(inode, stat);
856
857 /* We set the blksize from the cluster size for performance */
858 stat->blksize = osb->s_clustersize;
859
860bail:
861 mlog_exit(err);
862
863 return err;
864}
865
866static int ocfs2_write_remove_suid(struct inode *inode)
867{
868 int ret;
869 struct buffer_head *bh = NULL;
870 struct ocfs2_inode_info *oi = OCFS2_I(inode);
871 struct ocfs2_journal_handle *handle;
872 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
873 struct ocfs2_dinode *di;
874
Mark Fashehb0697052006-03-03 10:24:33 -0800875 mlog_entry("(Inode %llu, mode 0%o)\n",
876 (unsigned long long)oi->ip_blkno, inode->i_mode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800877
878 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
879 if (handle == NULL) {
880 ret = -ENOMEM;
881 mlog_errno(ret);
882 goto out;
883 }
884
885 ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
886 if (ret < 0) {
887 mlog_errno(ret);
888 goto out_trans;
889 }
890
891 ret = ocfs2_journal_access(handle, inode, bh,
892 OCFS2_JOURNAL_ACCESS_WRITE);
893 if (ret < 0) {
894 mlog_errno(ret);
895 goto out_bh;
896 }
897
898 inode->i_mode &= ~S_ISUID;
899 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
900 inode->i_mode &= ~S_ISGID;
901
902 di = (struct ocfs2_dinode *) bh->b_data;
903 di->i_mode = cpu_to_le16(inode->i_mode);
904
905 ret = ocfs2_journal_dirty(handle, bh);
906 if (ret < 0)
907 mlog_errno(ret);
908out_bh:
909 brelse(bh);
910out_trans:
911 ocfs2_commit_trans(handle);
912out:
913 mlog_exit(ret);
914 return ret;
915}
916
917static inline int ocfs2_write_should_remove_suid(struct inode *inode)
918{
919 mode_t mode = inode->i_mode;
920
921 if (!capable(CAP_FSETID)) {
922 if (unlikely(mode & S_ISUID))
923 return 1;
924
925 if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
926 return 1;
927 }
928 return 0;
929}
930
931static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
932 const char __user *buf,
933 size_t count,
934 loff_t pos)
935{
936 struct iovec local_iov = { .iov_base = (void __user *)buf,
937 .iov_len = count };
938 int ret, rw_level = -1, meta_level = -1, have_alloc_sem = 0;
939 u32 clusters;
940 struct file *filp = iocb->ki_filp;
941 struct inode *inode = filp->f_dentry->d_inode;
942 loff_t newsize, saved_pos;
Mark Fashehccd979b2005-12-15 14:31:24 -0800943
944 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
945 (unsigned int)count,
946 filp->f_dentry->d_name.len,
947 filp->f_dentry->d_name.name);
948
949 /* happy write of zero bytes */
950 if (count == 0)
951 return 0;
952
953 if (!inode) {
954 mlog(0, "bad inode\n");
955 return -EIO;
956 }
957
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800958 mutex_lock(&inode->i_mutex);
959 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
Mark Fashehccd979b2005-12-15 14:31:24 -0800960 if (filp->f_flags & O_DIRECT) {
961 have_alloc_sem = 1;
962 down_read(&inode->i_alloc_sem);
963 }
964
965 /* concurrent O_DIRECT writes are allowed */
966 rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1;
967 ret = ocfs2_rw_lock(inode, rw_level);
968 if (ret < 0) {
969 rw_level = -1;
970 mlog_errno(ret);
971 goto out;
972 }
973
974 /*
975 * We sample i_size under a read level meta lock to see if our write
976 * is extending the file, if it is we back off and get a write level
977 * meta lock.
978 */
979 meta_level = (filp->f_flags & O_APPEND) ? 1 : 0;
980 for(;;) {
981 ret = ocfs2_meta_lock(inode, NULL, NULL, meta_level);
982 if (ret < 0) {
983 meta_level = -1;
984 mlog_errno(ret);
985 goto out;
986 }
987
988 /* Clear suid / sgid if necessary. We do this here
989 * instead of later in the write path because
990 * remove_suid() calls ->setattr without any hint that
991 * we may have already done our cluster locking. Since
992 * ocfs2_setattr() *must* take cluster locks to
993 * proceeed, this will lead us to recursively lock the
994 * inode. There's also the dinode i_size state which
995 * can be lost via setattr during extending writes (we
996 * set inode->i_size at the end of a write. */
997 if (ocfs2_write_should_remove_suid(inode)) {
998 if (meta_level == 0) {
999 ocfs2_meta_unlock(inode, meta_level);
1000 meta_level = 1;
1001 continue;
1002 }
1003
1004 ret = ocfs2_write_remove_suid(inode);
1005 if (ret < 0) {
1006 mlog_errno(ret);
1007 goto out;
1008 }
1009 }
1010
1011 /* work on a copy of ppos until we're sure that we won't have
1012 * to recalculate it due to relocking. */
1013 if (filp->f_flags & O_APPEND) {
1014 saved_pos = i_size_read(inode);
1015 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
1016 } else {
1017 saved_pos = iocb->ki_pos;
1018 }
1019 newsize = count + saved_pos;
1020
Mark Fasheh215c7f92006-02-01 16:42:10 -08001021 mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
1022 (long long) saved_pos, (long long) newsize,
1023 (long long) i_size_read(inode));
Mark Fashehccd979b2005-12-15 14:31:24 -08001024
1025 /* No need for a higher level metadata lock if we're
1026 * never going past i_size. */
1027 if (newsize <= i_size_read(inode))
1028 break;
1029
1030 if (meta_level == 0) {
1031 ocfs2_meta_unlock(inode, meta_level);
1032 meta_level = 1;
1033 continue;
1034 }
1035
1036 spin_lock(&OCFS2_I(inode)->ip_lock);
1037 clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) -
1038 OCFS2_I(inode)->ip_clusters;
1039 spin_unlock(&OCFS2_I(inode)->ip_lock);
1040
1041 mlog(0, "Writing at EOF, may need more allocation: "
Mark Fasheh215c7f92006-02-01 16:42:10 -08001042 "i_size = %lld, newsize = %lld, need %u clusters\n",
1043 (long long) i_size_read(inode), (long long) newsize,
1044 clusters);
Mark Fashehccd979b2005-12-15 14:31:24 -08001045
1046 /* We only want to continue the rest of this loop if
1047 * our extend will actually require more
1048 * allocation. */
1049 if (!clusters)
1050 break;
1051
1052 ret = ocfs2_extend_allocation(inode, clusters);
1053 if (ret < 0) {
1054 if (ret != -ENOSPC)
1055 mlog_errno(ret);
1056 goto out;
1057 }
1058
1059 /* Fill any holes which would've been created by this
1060 * write. If we're O_APPEND, this will wind up
1061 * (correctly) being a noop. */
1062 ret = ocfs2_zero_extend(inode, (u64) newsize - count);
1063 if (ret < 0) {
1064 mlog_errno(ret);
1065 goto out;
1066 }
1067 break;
1068 }
1069
1070 /* ok, we're done with i_size and alloc work */
1071 iocb->ki_pos = saved_pos;
1072 ocfs2_meta_unlock(inode, meta_level);
1073 meta_level = -1;
1074
1075 /* communicate with ocfs2_dio_end_io */
1076 ocfs2_iocb_set_rw_locked(iocb);
1077
Mark Fashehd267a562006-02-23 13:23:39 -08001078 ret = generic_file_aio_write_nolock(iocb, &local_iov, 1, &iocb->ki_pos);
Mark Fashehccd979b2005-12-15 14:31:24 -08001079
1080 /* buffered aio wouldn't have proper lock coverage today */
1081 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
1082
1083 /*
1084 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
1085 * function pointer which is called when o_direct io completes so that
1086 * it can unlock our rw lock. (it's the clustered equivalent of
1087 * i_alloc_sem; protects truncate from racing with pending ios).
1088 * Unfortunately there are error cases which call end_io and others
1089 * that don't. so we don't have to unlock the rw_lock if either an
1090 * async dio is going to do it in the future or an end_io after an
1091 * error has already done it.
1092 */
1093 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1094 rw_level = -1;
1095 have_alloc_sem = 0;
1096 }
1097
1098out:
1099 if (meta_level != -1)
1100 ocfs2_meta_unlock(inode, meta_level);
1101 if (have_alloc_sem)
1102 up_read(&inode->i_alloc_sem);
1103 if (rw_level != -1)
1104 ocfs2_rw_unlock(inode, rw_level);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001105 mutex_unlock(&inode->i_mutex);
Mark Fashehccd979b2005-12-15 14:31:24 -08001106
1107 mlog_exit(ret);
1108 return ret;
1109}
1110
1111static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
1112 char __user *buf,
1113 size_t count,
1114 loff_t pos)
1115{
1116 int ret = 0, rw_level = -1, have_alloc_sem = 0;
1117 struct file *filp = iocb->ki_filp;
1118 struct inode *inode = filp->f_dentry->d_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -08001119
1120 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
1121 (unsigned int)count,
1122 filp->f_dentry->d_name.len,
1123 filp->f_dentry->d_name.name);
1124
1125 if (!inode) {
1126 ret = -EINVAL;
1127 mlog_errno(ret);
1128 goto bail;
1129 }
1130
Mark Fashehccd979b2005-12-15 14:31:24 -08001131 /*
1132 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
1133 * need locks to protect pending reads from racing with truncate.
1134 */
1135 if (filp->f_flags & O_DIRECT) {
1136 down_read(&inode->i_alloc_sem);
1137 have_alloc_sem = 1;
1138
1139 ret = ocfs2_rw_lock(inode, 0);
1140 if (ret < 0) {
1141 mlog_errno(ret);
1142 goto bail;
1143 }
1144 rw_level = 0;
1145 /* communicate with ocfs2_dio_end_io */
1146 ocfs2_iocb_set_rw_locked(iocb);
1147 }
1148
1149 ret = generic_file_aio_read(iocb, buf, count, iocb->ki_pos);
1150 if (ret == -EINVAL)
1151 mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n");
1152
1153 /* buffered aio wouldn't have proper lock coverage today */
1154 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
1155
1156 /* see ocfs2_file_aio_write */
1157 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1158 rw_level = -1;
1159 have_alloc_sem = 0;
1160 }
1161
1162bail:
1163 if (have_alloc_sem)
1164 up_read(&inode->i_alloc_sem);
1165 if (rw_level != -1)
1166 ocfs2_rw_unlock(inode, rw_level);
1167 mlog_exit(ret);
1168
1169 return ret;
1170}
1171
1172struct inode_operations ocfs2_file_iops = {
1173 .setattr = ocfs2_setattr,
1174 .getattr = ocfs2_getattr,
1175};
1176
1177struct inode_operations ocfs2_special_file_iops = {
1178 .setattr = ocfs2_setattr,
1179 .getattr = ocfs2_getattr,
1180};
1181
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001182const struct file_operations ocfs2_fops = {
Mark Fashehccd979b2005-12-15 14:31:24 -08001183 .read = do_sync_read,
1184 .write = do_sync_write,
1185 .sendfile = generic_file_sendfile,
1186 .mmap = ocfs2_mmap,
1187 .fsync = ocfs2_sync_file,
1188 .release = ocfs2_file_release,
1189 .open = ocfs2_file_open,
1190 .aio_read = ocfs2_file_aio_read,
1191 .aio_write = ocfs2_file_aio_write,
1192};
1193
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001194const struct file_operations ocfs2_dops = {
Mark Fashehccd979b2005-12-15 14:31:24 -08001195 .read = generic_read_dir,
1196 .readdir = ocfs2_readdir,
1197 .fsync = ocfs2_sync_file,
1198};