blob: 34e903a6a46b22e42be625f060e28973b6d77801 [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 Fashehb06970532006-03-03 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 Fashehb06970532006-03-03 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 Fashehb06970532006-03-03 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 Fashehb06970532006-03-03 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 Fashehb06970532006-03-03 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
263 if (le32_to_cpu(fe->i_clusters) ==
264 ocfs2_clusters_for_bytes(osb->sb, new_i_size)) {
265 mlog(0, "fe->i_clusters = %u, so we do a simple truncate\n",
266 fe->i_clusters);
267 /* No allocation change is required, so lets fast path
268 * this truncate. */
269 status = ocfs2_simple_size_update(inode, di_bh, new_i_size);
270 if (status < 0)
271 mlog_errno(status);
272 goto bail;
273 }
274
275 /* This forces other nodes to sync and drop their pages */
276 status = ocfs2_data_lock(inode, 1);
277 if (status < 0) {
278 mlog_errno(status);
279 goto bail;
280 }
281 ocfs2_data_unlock(inode, 1);
282
283 /* alright, we're going to need to do a full blown alloc size
284 * change. Orphan the inode so that recovery can complete the
285 * truncate if necessary. This does the task of marking
286 * i_size. */
287 status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
288 if (status < 0) {
289 mlog_errno(status);
290 goto bail;
291 }
292
293 status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
294 if (status < 0) {
295 mlog_errno(status);
296 goto bail;
297 }
298
299 status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
300 if (status < 0) {
301 mlog_errno(status);
302 goto bail;
303 }
304
305 /* TODO: orphan dir cleanup here. */
306bail:
307
308 mlog_exit(status);
309 return status;
310}
311
312/*
313 * extend allocation only here.
314 * we'll update all the disk stuff, and oip->alloc_size
315 *
316 * expect stuff to be locked, a transaction started and enough data /
317 * metadata reservations in the contexts.
318 *
319 * Will return -EAGAIN, and a reason if a restart is needed.
320 * If passed in, *reason will always be set, even in error.
321 */
322int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
323 struct inode *inode,
324 u32 clusters_to_add,
325 struct buffer_head *fe_bh,
326 struct ocfs2_journal_handle *handle,
327 struct ocfs2_alloc_context *data_ac,
328 struct ocfs2_alloc_context *meta_ac,
329 enum ocfs2_alloc_restarted *reason_ret)
330{
331 int status = 0;
332 int free_extents;
333 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
334 enum ocfs2_alloc_restarted reason = RESTART_NONE;
335 u32 bit_off, num_bits;
336 u64 block;
337
338 BUG_ON(!clusters_to_add);
339
340 free_extents = ocfs2_num_free_extents(osb, inode, fe);
341 if (free_extents < 0) {
342 status = free_extents;
343 mlog_errno(status);
344 goto leave;
345 }
346
347 /* there are two cases which could cause us to EAGAIN in the
348 * we-need-more-metadata case:
349 * 1) we haven't reserved *any*
350 * 2) we are so fragmented, we've needed to add metadata too
351 * many times. */
352 if (!free_extents && !meta_ac) {
353 mlog(0, "we haven't reserved any metadata!\n");
354 status = -EAGAIN;
355 reason = RESTART_META;
356 goto leave;
357 } else if ((!free_extents)
358 && (ocfs2_alloc_context_bits_left(meta_ac)
359 < ocfs2_extend_meta_needed(fe))) {
360 mlog(0, "filesystem is really fragmented...\n");
361 status = -EAGAIN;
362 reason = RESTART_META;
363 goto leave;
364 }
365
366 status = ocfs2_claim_clusters(osb, handle, data_ac, 1,
367 &bit_off, &num_bits);
368 if (status < 0) {
369 if (status != -ENOSPC)
370 mlog_errno(status);
371 goto leave;
372 }
373
374 BUG_ON(num_bits > clusters_to_add);
375
376 /* reserve our write early -- insert_extent may update the inode */
377 status = ocfs2_journal_access(handle, inode, fe_bh,
378 OCFS2_JOURNAL_ACCESS_WRITE);
379 if (status < 0) {
380 mlog_errno(status);
381 goto leave;
382 }
383
384 block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
Mark Fashehb06970532006-03-03 10:24:33 -0800385 mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
386 num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800387 status = ocfs2_insert_extent(osb, handle, inode, fe_bh, block,
388 num_bits, meta_ac);
389 if (status < 0) {
390 mlog_errno(status);
391 goto leave;
392 }
393
394 le32_add_cpu(&fe->i_clusters, num_bits);
395 spin_lock(&OCFS2_I(inode)->ip_lock);
396 OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
397 spin_unlock(&OCFS2_I(inode)->ip_lock);
398
399 status = ocfs2_journal_dirty(handle, fe_bh);
400 if (status < 0) {
401 mlog_errno(status);
402 goto leave;
403 }
404
405 clusters_to_add -= num_bits;
406
407 if (clusters_to_add) {
408 mlog(0, "need to alloc once more, clusters = %u, wanted = "
409 "%u\n", fe->i_clusters, clusters_to_add);
410 status = -EAGAIN;
411 reason = RESTART_TRANS;
412 }
413
414leave:
415 mlog_exit(status);
416 if (reason_ret)
417 *reason_ret = reason;
418 return status;
419}
420
421static int ocfs2_extend_allocation(struct inode *inode,
422 u32 clusters_to_add)
423{
424 int status = 0;
425 int restart_func = 0;
426 int drop_alloc_sem = 0;
427 int credits, num_free_extents;
428 u32 prev_clusters;
429 struct buffer_head *bh = NULL;
430 struct ocfs2_dinode *fe = NULL;
431 struct ocfs2_journal_handle *handle = NULL;
432 struct ocfs2_alloc_context *data_ac = NULL;
433 struct ocfs2_alloc_context *meta_ac = NULL;
434 enum ocfs2_alloc_restarted why;
435 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
436
437 mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
438
439 status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
440 OCFS2_BH_CACHED, inode);
441 if (status < 0) {
442 mlog_errno(status);
443 goto leave;
444 }
445
446 fe = (struct ocfs2_dinode *) bh->b_data;
447 if (!OCFS2_IS_VALID_DINODE(fe)) {
448 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
449 status = -EIO;
450 goto leave;
451 }
452
453restart_all:
454 BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
455
Mark Fashehb06970532006-03-03 10:24:33 -0800456 mlog(0, "extend inode %llu, i_size = %lld, fe->i_clusters = %u, "
Mark Fashehccd979b2005-12-15 14:31:24 -0800457 "clusters_to_add = %u\n",
Mark Fashehb06970532006-03-03 10:24:33 -0800458 (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode),
Mark Fashehccd979b2005-12-15 14:31:24 -0800459 fe->i_clusters, clusters_to_add);
460
461 handle = ocfs2_alloc_handle(osb);
462 if (handle == NULL) {
463 status = -ENOMEM;
464 mlog_errno(status);
465 goto leave;
466 }
467
468 num_free_extents = ocfs2_num_free_extents(osb,
469 inode,
470 fe);
471 if (num_free_extents < 0) {
472 status = num_free_extents;
473 mlog_errno(status);
474 goto leave;
475 }
476
477 if (!num_free_extents) {
478 status = ocfs2_reserve_new_metadata(osb,
479 handle,
480 fe,
481 &meta_ac);
482 if (status < 0) {
483 if (status != -ENOSPC)
484 mlog_errno(status);
485 goto leave;
486 }
487 }
488
489 status = ocfs2_reserve_clusters(osb,
490 handle,
491 clusters_to_add,
492 &data_ac);
493 if (status < 0) {
494 if (status != -ENOSPC)
495 mlog_errno(status);
496 goto leave;
497 }
498
499 /* blocks peope in read/write from reading our allocation
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800500 * until we're done changing it. We depend on i_mutex to block
Mark Fashehccd979b2005-12-15 14:31:24 -0800501 * other extend/truncate calls while we're here. Ordering wrt
502 * start_trans is important here -- always do it before! */
503 down_write(&OCFS2_I(inode)->ip_alloc_sem);
504 drop_alloc_sem = 1;
505
506 credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
507 handle = ocfs2_start_trans(osb, handle, credits);
508 if (IS_ERR(handle)) {
509 status = PTR_ERR(handle);
510 handle = NULL;
511 mlog_errno(status);
512 goto leave;
513 }
514
515restarted_transaction:
516 /* reserve a write to the file entry early on - that we if we
517 * run out of credits in the allocation path, we can still
518 * update i_size. */
519 status = ocfs2_journal_access(handle, inode, bh,
520 OCFS2_JOURNAL_ACCESS_WRITE);
521 if (status < 0) {
522 mlog_errno(status);
523 goto leave;
524 }
525
526 prev_clusters = OCFS2_I(inode)->ip_clusters;
527
528 status = ocfs2_do_extend_allocation(osb,
529 inode,
530 clusters_to_add,
531 bh,
532 handle,
533 data_ac,
534 meta_ac,
535 &why);
536 if ((status < 0) && (status != -EAGAIN)) {
537 if (status != -ENOSPC)
538 mlog_errno(status);
539 goto leave;
540 }
541
542 status = ocfs2_journal_dirty(handle, bh);
543 if (status < 0) {
544 mlog_errno(status);
545 goto leave;
546 }
547
548 spin_lock(&OCFS2_I(inode)->ip_lock);
549 clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
550 spin_unlock(&OCFS2_I(inode)->ip_lock);
551
552 if (why != RESTART_NONE && clusters_to_add) {
553 if (why == RESTART_META) {
554 mlog(0, "restarting function.\n");
555 restart_func = 1;
556 } else {
557 BUG_ON(why != RESTART_TRANS);
558
559 mlog(0, "restarting transaction.\n");
560 /* TODO: This can be more intelligent. */
561 credits = ocfs2_calc_extend_credits(osb->sb,
562 fe,
563 clusters_to_add);
564 status = ocfs2_extend_trans(handle, credits);
565 if (status < 0) {
566 /* handle still has to be committed at
567 * this point. */
568 status = -ENOMEM;
569 mlog_errno(status);
570 goto leave;
571 }
572 goto restarted_transaction;
573 }
574 }
575
Mark Fashehb06970532006-03-03 10:24:33 -0800576 mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
577 fe->i_clusters, (unsigned long long)fe->i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -0800578 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
579 OCFS2_I(inode)->ip_clusters, i_size_read(inode));
580
581leave:
582 if (drop_alloc_sem) {
583 up_write(&OCFS2_I(inode)->ip_alloc_sem);
584 drop_alloc_sem = 0;
585 }
586 if (handle) {
587 ocfs2_commit_trans(handle);
588 handle = NULL;
589 }
590 if (data_ac) {
591 ocfs2_free_alloc_context(data_ac);
592 data_ac = NULL;
593 }
594 if (meta_ac) {
595 ocfs2_free_alloc_context(meta_ac);
596 meta_ac = NULL;
597 }
598 if ((!status) && restart_func) {
599 restart_func = 0;
600 goto restart_all;
601 }
602 if (bh) {
603 brelse(bh);
604 bh = NULL;
605 }
606
607 mlog_exit(status);
608 return status;
609}
610
611/* Some parts of this taken from generic_cont_expand, which turned out
612 * to be too fragile to do exactly what we need without us having to
613 * worry about recursive locking in ->commit_write(). */
614static int ocfs2_write_zero_page(struct inode *inode,
615 u64 size)
616{
617 struct address_space *mapping = inode->i_mapping;
618 struct page *page;
619 unsigned long index;
620 unsigned int offset;
621 struct ocfs2_journal_handle *handle = NULL;
622 int ret;
623
624 offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */
625 /* ugh. in prepare/commit_write, if from==to==start of block, we
626 ** skip the prepare. make sure we never send an offset for the start
627 ** of a block
628 */
629 if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) {
630 offset++;
631 }
632 index = size >> PAGE_CACHE_SHIFT;
633
634 page = grab_cache_page(mapping, index);
635 if (!page) {
636 ret = -ENOMEM;
637 mlog_errno(ret);
638 goto out;
639 }
640
641 ret = ocfs2_prepare_write(NULL, page, offset, offset);
642 if (ret < 0) {
643 mlog_errno(ret);
644 goto out_unlock;
645 }
646
647 if (ocfs2_should_order_data(inode)) {
648 handle = ocfs2_start_walk_page_trans(inode, page, offset,
649 offset);
650 if (IS_ERR(handle)) {
651 ret = PTR_ERR(handle);
652 handle = NULL;
653 goto out_unlock;
654 }
655 }
656
657 /* must not update i_size! */
658 ret = block_commit_write(page, offset, offset);
659 if (ret < 0)
660 mlog_errno(ret);
661 else
662 ret = 0;
663
664 if (handle)
665 ocfs2_commit_trans(handle);
666out_unlock:
667 unlock_page(page);
668 page_cache_release(page);
669out:
670 return ret;
671}
672
673static int ocfs2_zero_extend(struct inode *inode,
674 u64 zero_to_size)
675{
676 int ret = 0;
677 u64 start_off;
678 struct super_block *sb = inode->i_sb;
679
680 start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
681 while (start_off < zero_to_size) {
682 ret = ocfs2_write_zero_page(inode, start_off);
683 if (ret < 0) {
684 mlog_errno(ret);
685 goto out;
686 }
687
688 start_off += sb->s_blocksize;
689 }
690
691out:
692 return ret;
693}
694
695static int ocfs2_extend_file(struct inode *inode,
696 struct buffer_head *di_bh,
697 u64 new_i_size)
698{
699 int ret = 0;
700 u32 clusters_to_add;
701
702 /* setattr sometimes calls us like this. */
703 if (new_i_size == 0)
704 goto out;
705
706 if (i_size_read(inode) == new_i_size)
707 goto out;
708 BUG_ON(new_i_size < i_size_read(inode));
709
710 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) -
711 OCFS2_I(inode)->ip_clusters;
712
713 if (clusters_to_add) {
714 ret = ocfs2_extend_allocation(inode, clusters_to_add);
715 if (ret < 0) {
716 mlog_errno(ret);
717 goto out;
718 }
719
720 ret = ocfs2_zero_extend(inode, new_i_size);
721 if (ret < 0) {
722 mlog_errno(ret);
723 goto out;
724 }
725 }
726
727 /* No allocation required, we just use this helper to
728 * do a trivial update of i_size. */
729 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
730 if (ret < 0) {
731 mlog_errno(ret);
732 goto out;
733 }
734
735out:
736 return ret;
737}
738
739int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
740{
741 int status = 0, size_change;
742 struct inode *inode = dentry->d_inode;
743 struct super_block *sb = inode->i_sb;
744 struct ocfs2_super *osb = OCFS2_SB(sb);
745 struct buffer_head *bh = NULL;
746 struct ocfs2_journal_handle *handle = NULL;
747
748 mlog_entry("(0x%p, '%.*s')\n", dentry,
749 dentry->d_name.len, dentry->d_name.name);
750
751 if (attr->ia_valid & ATTR_MODE)
752 mlog(0, "mode change: %d\n", attr->ia_mode);
753 if (attr->ia_valid & ATTR_UID)
754 mlog(0, "uid change: %d\n", attr->ia_uid);
755 if (attr->ia_valid & ATTR_GID)
756 mlog(0, "gid change: %d\n", attr->ia_gid);
757 if (attr->ia_valid & ATTR_SIZE)
758 mlog(0, "size change...\n");
759 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
760 mlog(0, "time change...\n");
761
762#define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
763 | ATTR_GID | ATTR_UID | ATTR_MODE)
764 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
765 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
766 return 0;
767 }
768
769 status = inode_change_ok(inode, attr);
770 if (status)
771 return status;
772
773 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
774 if (size_change) {
775 status = ocfs2_rw_lock(inode, 1);
776 if (status < 0) {
777 mlog_errno(status);
778 goto bail;
779 }
780 }
781
782 status = ocfs2_meta_lock(inode, NULL, &bh, 1);
783 if (status < 0) {
784 if (status != -ENOENT)
785 mlog_errno(status);
786 goto bail_unlock_rw;
787 }
788
789 if (size_change && attr->ia_size != i_size_read(inode)) {
790 if (i_size_read(inode) > attr->ia_size)
791 status = ocfs2_truncate_file(inode, bh, attr->ia_size);
792 else
793 status = ocfs2_extend_file(inode, bh, attr->ia_size);
794 if (status < 0) {
795 if (status != -ENOSPC)
796 mlog_errno(status);
797 status = -ENOSPC;
798 goto bail_unlock;
799 }
800 }
801
802 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
803 if (IS_ERR(handle)) {
804 status = PTR_ERR(handle);
805 mlog_errno(status);
806 goto bail_unlock;
807 }
808
809 status = inode_setattr(inode, attr);
810 if (status < 0) {
811 mlog_errno(status);
812 goto bail_commit;
813 }
814
815 status = ocfs2_mark_inode_dirty(handle, inode, bh);
816 if (status < 0)
817 mlog_errno(status);
818
819bail_commit:
820 ocfs2_commit_trans(handle);
821bail_unlock:
822 ocfs2_meta_unlock(inode, 1);
823bail_unlock_rw:
824 if (size_change)
825 ocfs2_rw_unlock(inode, 1);
826bail:
827 if (bh)
828 brelse(bh);
829
830 mlog_exit(status);
831 return status;
832}
833
834int ocfs2_getattr(struct vfsmount *mnt,
835 struct dentry *dentry,
836 struct kstat *stat)
837{
838 struct inode *inode = dentry->d_inode;
839 struct super_block *sb = dentry->d_inode->i_sb;
840 struct ocfs2_super *osb = sb->s_fs_info;
841 int err;
842
843 mlog_entry_void();
844
845 err = ocfs2_inode_revalidate(dentry);
846 if (err) {
847 if (err != -ENOENT)
848 mlog_errno(err);
849 goto bail;
850 }
851
852 generic_fillattr(inode, stat);
853
854 /* We set the blksize from the cluster size for performance */
855 stat->blksize = osb->s_clustersize;
856
857bail:
858 mlog_exit(err);
859
860 return err;
861}
862
863static int ocfs2_write_remove_suid(struct inode *inode)
864{
865 int ret;
866 struct buffer_head *bh = NULL;
867 struct ocfs2_inode_info *oi = OCFS2_I(inode);
868 struct ocfs2_journal_handle *handle;
869 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
870 struct ocfs2_dinode *di;
871
Mark Fashehb06970532006-03-03 10:24:33 -0800872 mlog_entry("(Inode %llu, mode 0%o)\n",
873 (unsigned long long)oi->ip_blkno, inode->i_mode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800874
875 handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
876 if (handle == NULL) {
877 ret = -ENOMEM;
878 mlog_errno(ret);
879 goto out;
880 }
881
882 ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
883 if (ret < 0) {
884 mlog_errno(ret);
885 goto out_trans;
886 }
887
888 ret = ocfs2_journal_access(handle, inode, bh,
889 OCFS2_JOURNAL_ACCESS_WRITE);
890 if (ret < 0) {
891 mlog_errno(ret);
892 goto out_bh;
893 }
894
895 inode->i_mode &= ~S_ISUID;
896 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
897 inode->i_mode &= ~S_ISGID;
898
899 di = (struct ocfs2_dinode *) bh->b_data;
900 di->i_mode = cpu_to_le16(inode->i_mode);
901
902 ret = ocfs2_journal_dirty(handle, bh);
903 if (ret < 0)
904 mlog_errno(ret);
905out_bh:
906 brelse(bh);
907out_trans:
908 ocfs2_commit_trans(handle);
909out:
910 mlog_exit(ret);
911 return ret;
912}
913
914static inline int ocfs2_write_should_remove_suid(struct inode *inode)
915{
916 mode_t mode = inode->i_mode;
917
918 if (!capable(CAP_FSETID)) {
919 if (unlikely(mode & S_ISUID))
920 return 1;
921
922 if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
923 return 1;
924 }
925 return 0;
926}
927
928static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
929 const char __user *buf,
930 size_t count,
931 loff_t pos)
932{
933 struct iovec local_iov = { .iov_base = (void __user *)buf,
934 .iov_len = count };
935 int ret, rw_level = -1, meta_level = -1, have_alloc_sem = 0;
936 u32 clusters;
937 struct file *filp = iocb->ki_filp;
938 struct inode *inode = filp->f_dentry->d_inode;
939 loff_t newsize, saved_pos;
Mark Fashehccd979b2005-12-15 14:31:24 -0800940
941 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
942 (unsigned int)count,
943 filp->f_dentry->d_name.len,
944 filp->f_dentry->d_name.name);
945
946 /* happy write of zero bytes */
947 if (count == 0)
948 return 0;
949
950 if (!inode) {
951 mlog(0, "bad inode\n");
952 return -EIO;
953 }
954
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800955 mutex_lock(&inode->i_mutex);
956 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
Mark Fashehccd979b2005-12-15 14:31:24 -0800957 if (filp->f_flags & O_DIRECT) {
958 have_alloc_sem = 1;
959 down_read(&inode->i_alloc_sem);
960 }
961
962 /* concurrent O_DIRECT writes are allowed */
963 rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1;
964 ret = ocfs2_rw_lock(inode, rw_level);
965 if (ret < 0) {
966 rw_level = -1;
967 mlog_errno(ret);
968 goto out;
969 }
970
971 /*
972 * We sample i_size under a read level meta lock to see if our write
973 * is extending the file, if it is we back off and get a write level
974 * meta lock.
975 */
976 meta_level = (filp->f_flags & O_APPEND) ? 1 : 0;
977 for(;;) {
978 ret = ocfs2_meta_lock(inode, NULL, NULL, meta_level);
979 if (ret < 0) {
980 meta_level = -1;
981 mlog_errno(ret);
982 goto out;
983 }
984
985 /* Clear suid / sgid if necessary. We do this here
986 * instead of later in the write path because
987 * remove_suid() calls ->setattr without any hint that
988 * we may have already done our cluster locking. Since
989 * ocfs2_setattr() *must* take cluster locks to
990 * proceeed, this will lead us to recursively lock the
991 * inode. There's also the dinode i_size state which
992 * can be lost via setattr during extending writes (we
993 * set inode->i_size at the end of a write. */
994 if (ocfs2_write_should_remove_suid(inode)) {
995 if (meta_level == 0) {
996 ocfs2_meta_unlock(inode, meta_level);
997 meta_level = 1;
998 continue;
999 }
1000
1001 ret = ocfs2_write_remove_suid(inode);
1002 if (ret < 0) {
1003 mlog_errno(ret);
1004 goto out;
1005 }
1006 }
1007
1008 /* work on a copy of ppos until we're sure that we won't have
1009 * to recalculate it due to relocking. */
1010 if (filp->f_flags & O_APPEND) {
1011 saved_pos = i_size_read(inode);
1012 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
1013 } else {
1014 saved_pos = iocb->ki_pos;
1015 }
1016 newsize = count + saved_pos;
1017
Mark Fasheh215c7f92006-02-01 16:42:10 -08001018 mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
1019 (long long) saved_pos, (long long) newsize,
1020 (long long) i_size_read(inode));
Mark Fashehccd979b2005-12-15 14:31:24 -08001021
1022 /* No need for a higher level metadata lock if we're
1023 * never going past i_size. */
1024 if (newsize <= i_size_read(inode))
1025 break;
1026
1027 if (meta_level == 0) {
1028 ocfs2_meta_unlock(inode, meta_level);
1029 meta_level = 1;
1030 continue;
1031 }
1032
1033 spin_lock(&OCFS2_I(inode)->ip_lock);
1034 clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) -
1035 OCFS2_I(inode)->ip_clusters;
1036 spin_unlock(&OCFS2_I(inode)->ip_lock);
1037
1038 mlog(0, "Writing at EOF, may need more allocation: "
Mark Fasheh215c7f92006-02-01 16:42:10 -08001039 "i_size = %lld, newsize = %lld, need %u clusters\n",
1040 (long long) i_size_read(inode), (long long) newsize,
1041 clusters);
Mark Fashehccd979b2005-12-15 14:31:24 -08001042
1043 /* We only want to continue the rest of this loop if
1044 * our extend will actually require more
1045 * allocation. */
1046 if (!clusters)
1047 break;
1048
1049 ret = ocfs2_extend_allocation(inode, clusters);
1050 if (ret < 0) {
1051 if (ret != -ENOSPC)
1052 mlog_errno(ret);
1053 goto out;
1054 }
1055
1056 /* Fill any holes which would've been created by this
1057 * write. If we're O_APPEND, this will wind up
1058 * (correctly) being a noop. */
1059 ret = ocfs2_zero_extend(inode, (u64) newsize - count);
1060 if (ret < 0) {
1061 mlog_errno(ret);
1062 goto out;
1063 }
1064 break;
1065 }
1066
1067 /* ok, we're done with i_size and alloc work */
1068 iocb->ki_pos = saved_pos;
1069 ocfs2_meta_unlock(inode, meta_level);
1070 meta_level = -1;
1071
1072 /* communicate with ocfs2_dio_end_io */
1073 ocfs2_iocb_set_rw_locked(iocb);
1074
Mark Fashehd267a562006-02-23 13:23:39 -08001075 ret = generic_file_aio_write_nolock(iocb, &local_iov, 1, &iocb->ki_pos);
Mark Fashehccd979b2005-12-15 14:31:24 -08001076
1077 /* buffered aio wouldn't have proper lock coverage today */
1078 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
1079
1080 /*
1081 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
1082 * function pointer which is called when o_direct io completes so that
1083 * it can unlock our rw lock. (it's the clustered equivalent of
1084 * i_alloc_sem; protects truncate from racing with pending ios).
1085 * Unfortunately there are error cases which call end_io and others
1086 * that don't. so we don't have to unlock the rw_lock if either an
1087 * async dio is going to do it in the future or an end_io after an
1088 * error has already done it.
1089 */
1090 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1091 rw_level = -1;
1092 have_alloc_sem = 0;
1093 }
1094
1095out:
1096 if (meta_level != -1)
1097 ocfs2_meta_unlock(inode, meta_level);
1098 if (have_alloc_sem)
1099 up_read(&inode->i_alloc_sem);
1100 if (rw_level != -1)
1101 ocfs2_rw_unlock(inode, rw_level);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001102 mutex_unlock(&inode->i_mutex);
Mark Fashehccd979b2005-12-15 14:31:24 -08001103
1104 mlog_exit(ret);
1105 return ret;
1106}
1107
1108static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
1109 char __user *buf,
1110 size_t count,
1111 loff_t pos)
1112{
1113 int ret = 0, rw_level = -1, have_alloc_sem = 0;
1114 struct file *filp = iocb->ki_filp;
1115 struct inode *inode = filp->f_dentry->d_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -08001116
1117 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", filp, buf,
1118 (unsigned int)count,
1119 filp->f_dentry->d_name.len,
1120 filp->f_dentry->d_name.name);
1121
1122 if (!inode) {
1123 ret = -EINVAL;
1124 mlog_errno(ret);
1125 goto bail;
1126 }
1127
Mark Fashehccd979b2005-12-15 14:31:24 -08001128 /*
1129 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
1130 * need locks to protect pending reads from racing with truncate.
1131 */
1132 if (filp->f_flags & O_DIRECT) {
1133 down_read(&inode->i_alloc_sem);
1134 have_alloc_sem = 1;
1135
1136 ret = ocfs2_rw_lock(inode, 0);
1137 if (ret < 0) {
1138 mlog_errno(ret);
1139 goto bail;
1140 }
1141 rw_level = 0;
1142 /* communicate with ocfs2_dio_end_io */
1143 ocfs2_iocb_set_rw_locked(iocb);
1144 }
1145
1146 ret = generic_file_aio_read(iocb, buf, count, iocb->ki_pos);
1147 if (ret == -EINVAL)
1148 mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n");
1149
1150 /* buffered aio wouldn't have proper lock coverage today */
1151 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
1152
1153 /* see ocfs2_file_aio_write */
1154 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
1155 rw_level = -1;
1156 have_alloc_sem = 0;
1157 }
1158
1159bail:
1160 if (have_alloc_sem)
1161 up_read(&inode->i_alloc_sem);
1162 if (rw_level != -1)
1163 ocfs2_rw_unlock(inode, rw_level);
1164 mlog_exit(ret);
1165
1166 return ret;
1167}
1168
1169struct inode_operations ocfs2_file_iops = {
1170 .setattr = ocfs2_setattr,
1171 .getattr = ocfs2_getattr,
1172};
1173
1174struct inode_operations ocfs2_special_file_iops = {
1175 .setattr = ocfs2_setattr,
1176 .getattr = ocfs2_getattr,
1177};
1178
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001179const struct file_operations ocfs2_fops = {
Mark Fashehccd979b2005-12-15 14:31:24 -08001180 .read = do_sync_read,
1181 .write = do_sync_write,
1182 .sendfile = generic_file_sendfile,
1183 .mmap = ocfs2_mmap,
1184 .fsync = ocfs2_sync_file,
1185 .release = ocfs2_file_release,
1186 .open = ocfs2_file_open,
1187 .aio_read = ocfs2_file_aio_read,
1188 .aio_write = ocfs2_file_aio_write,
1189};
1190
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001191const struct file_operations ocfs2_dops = {
Mark Fashehccd979b2005-12-15 14:31:24 -08001192 .read = generic_read_dir,
1193 .readdir = ocfs2_readdir,
1194 .fsync = ocfs2_sync_file,
1195};