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epoll: limit paths
[linux-2.6/libata-dev.git] / fs / ocfs2 / namei.c
blobbe244692550db3e18cf05987ff577717e1f33173
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * namei.c
5 *
6 * Create and rename file, directory, symlinks
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * Portions of this code from linux/fs/ext3/dir.c
11 *
12 * Copyright (C) 1992, 1993, 1994, 1995
13 * Remy Card (card@masi.ibp.fr)
14 * Laboratoire MASI - Institut Blaise pascal
15 * Universite Pierre et Marie Curie (Paris VI)
16 *
17 * from
18 *
19 * linux/fs/minix/dir.c
20 *
21 * Copyright (C) 1991, 1992 Linux Torvalds
22 *
23 * This program is free software; you can redistribute it and/or
24 * modify it under the terms of the GNU General Public
25 * License as published by the Free Software Foundation; either
26 * version 2 of the License, or (at your option) any later version.
27 *
28 * This program is distributed in the hope that it will be useful,
29 * but WITHOUT ANY WARRANTY; without even the implied warranty of
30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
31 * General Public License for more details.
32 *
33 * You should have received a copy of the GNU General Public
34 * License along with this program; if not, write to the
35 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
36 * Boston, MA 021110-1307, USA.
37 */
38
39 #include <linux/fs.h>
40 #include <linux/types.h>
41 #include <linux/slab.h>
42 #include <linux/highmem.h>
43 #include <linux/quotaops.h>
44
45 #include <cluster/masklog.h>
46
47 #include "ocfs2.h"
48
49 #include "alloc.h"
50 #include "dcache.h"
51 #include "dir.h"
52 #include "dlmglue.h"
53 #include "extent_map.h"
54 #include "file.h"
55 #include "inode.h"
56 #include "journal.h"
57 #include "namei.h"
58 #include "suballoc.h"
59 #include "super.h"
60 #include "symlink.h"
61 #include "sysfile.h"
62 #include "uptodate.h"
63 #include "xattr.h"
64 #include "acl.h"
65 #include "ocfs2_trace.h"
66
67 #include "buffer_head_io.h"
68
69 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
70 struct inode *dir,
71 struct inode *inode,
72 dev_t dev,
73 struct buffer_head **new_fe_bh,
74 struct buffer_head *parent_fe_bh,
75 handle_t *handle,
76 struct ocfs2_alloc_context *inode_ac);
77
78 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
79 struct inode **ret_orphan_dir,
80 u64 blkno,
81 char *name,
82 struct ocfs2_dir_lookup_result *lookup);
83
84 static int ocfs2_orphan_add(struct ocfs2_super *osb,
85 handle_t *handle,
86 struct inode *inode,
87 struct buffer_head *fe_bh,
88 char *name,
89 struct ocfs2_dir_lookup_result *lookup,
90 struct inode *orphan_dir_inode);
91
92 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
93 handle_t *handle,
94 struct inode *inode,
95 const char *symname);
96
97 /* An orphan dir name is an 8 byte value, printed as a hex string */
98 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
99
100 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
101 struct nameidata *nd)
102 {
103 int status;
104 u64 blkno;
105 struct inode *inode = NULL;
106 struct dentry *ret;
107 struct ocfs2_inode_info *oi;
108
109 trace_ocfs2_lookup(dir, dentry, dentry->d_name.len,
110 dentry->d_name.name,
111 (unsigned long long)OCFS2_I(dir)->ip_blkno, 0);
112
113 if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
114 ret = ERR_PTR(-ENAMETOOLONG);
115 goto bail;
116 }
117
118 status = ocfs2_inode_lock_nested(dir, NULL, 0, OI_LS_PARENT);
119 if (status < 0) {
120 if (status != -ENOENT)
121 mlog_errno(status);
122 ret = ERR_PTR(status);
123 goto bail;
124 }
125
126 status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
127 dentry->d_name.len, &blkno);
128 if (status < 0)
129 goto bail_add;
130
131 inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
132 if (IS_ERR(inode)) {
133 ret = ERR_PTR(-EACCES);
134 goto bail_unlock;
135 }
136
137 oi = OCFS2_I(inode);
138 /* Clear any orphaned state... If we were able to look up the
139 * inode from a directory, it certainly can't be orphaned. We
140 * might have the bad state from a node which intended to
141 * orphan this inode but crashed before it could commit the
142 * unlink. */
143 spin_lock(&oi->ip_lock);
144 oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
145 spin_unlock(&oi->ip_lock);
146
147 bail_add:
148 ret = d_splice_alias(inode, dentry);
149
150 if (inode) {
151 /*
152 * If d_splice_alias() finds a DCACHE_DISCONNECTED
153 * dentry, it will d_move() it on top of ourse. The
154 * return value will indicate this however, so in
155 * those cases, we switch them around for the locking
156 * code.
157 *
158 * NOTE: This dentry already has ->d_op set from
159 * ocfs2_get_parent() and ocfs2_get_dentry()
160 */
161 if (ret)
162 dentry = ret;
163
164 status = ocfs2_dentry_attach_lock(dentry, inode,
165 OCFS2_I(dir)->ip_blkno);
166 if (status) {
167 mlog_errno(status);
168 ret = ERR_PTR(status);
169 goto bail_unlock;
170 }
171 } else
172 ocfs2_dentry_attach_gen(dentry);
173
174 bail_unlock:
175 /* Don't drop the cluster lock until *after* the d_add --
176 * unlink on another node will message us to remove that
177 * dentry under this lock so otherwise we can race this with
178 * the downconvert thread and have a stale dentry. */
179 ocfs2_inode_unlock(dir, 0);
180
181 bail:
182
183 trace_ocfs2_lookup_ret(ret);
184
185 return ret;
186 }
187
188 static struct inode *ocfs2_get_init_inode(struct inode *dir, umode_t mode)
189 {
190 struct inode *inode;
191
192 inode = new_inode(dir->i_sb);
193 if (!inode) {
194 mlog(ML_ERROR, "new_inode failed!\n");
195 return NULL;
196 }
197
198 /* populate as many fields early on as possible - many of
199 * these are used by the support functions here and in
200 * callers. */
201 if (S_ISDIR(mode))
202 set_nlink(inode, 2);
203 inode_init_owner(inode, dir, mode);
204 dquot_initialize(inode);
205 return inode;
206 }
207
208 static int ocfs2_mknod(struct inode *dir,
209 struct dentry *dentry,
210 umode_t mode,
211 dev_t dev)
212 {
213 int status = 0;
214 struct buffer_head *parent_fe_bh = NULL;
215 handle_t *handle = NULL;
216 struct ocfs2_super *osb;
217 struct ocfs2_dinode *dirfe;
218 struct buffer_head *new_fe_bh = NULL;
219 struct inode *inode = NULL;
220 struct ocfs2_alloc_context *inode_ac = NULL;
221 struct ocfs2_alloc_context *data_ac = NULL;
222 struct ocfs2_alloc_context *meta_ac = NULL;
223 int want_clusters = 0;
224 int want_meta = 0;
225 int xattr_credits = 0;
226 struct ocfs2_security_xattr_info si = {
227 .enable = 1,
228 };
229 int did_quota_inode = 0;
230 struct ocfs2_dir_lookup_result lookup = { NULL, };
231 sigset_t oldset;
232 int did_block_signals = 0;
233
234 trace_ocfs2_mknod(dir, dentry, dentry->d_name.len, dentry->d_name.name,
235 (unsigned long long)OCFS2_I(dir)->ip_blkno,
236 (unsigned long)dev, mode);
237
238 dquot_initialize(dir);
239
240 /* get our super block */
241 osb = OCFS2_SB(dir->i_sb);
242
243 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
244 if (status < 0) {
245 if (status != -ENOENT)
246 mlog_errno(status);
247 return status;
248 }
249
250 if (S_ISDIR(mode) && (dir->i_nlink >= ocfs2_link_max(osb))) {
251 status = -EMLINK;
252 goto leave;
253 }
254
255 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
256 if (!ocfs2_read_links_count(dirfe)) {
257 /* can't make a file in a deleted directory. */
258 status = -ENOENT;
259 goto leave;
260 }
261
262 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
263 dentry->d_name.len);
264 if (status)
265 goto leave;
266
267 /* get a spot inside the dir. */
268 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
269 dentry->d_name.name,
270 dentry->d_name.len, &lookup);
271 if (status < 0) {
272 mlog_errno(status);
273 goto leave;
274 }
275
276 /* reserve an inode spot */
277 status = ocfs2_reserve_new_inode(osb, &inode_ac);
278 if (status < 0) {
279 if (status != -ENOSPC)
280 mlog_errno(status);
281 goto leave;
282 }
283
284 inode = ocfs2_get_init_inode(dir, mode);
285 if (!inode) {
286 status = -ENOMEM;
287 mlog_errno(status);
288 goto leave;
289 }
290
291 /* get security xattr */
292 status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
293 if (status) {
294 if (status == -EOPNOTSUPP)
295 si.enable = 0;
296 else {
297 mlog_errno(status);
298 goto leave;
299 }
300 }
301
302 /* calculate meta data/clusters for setting security and acl xattr */
303 status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
304 &si, &want_clusters,
305 &xattr_credits, &want_meta);
306 if (status < 0) {
307 mlog_errno(status);
308 goto leave;
309 }
310
311 /* Reserve a cluster if creating an extent based directory. */
312 if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
313 want_clusters += 1;
314
315 /* Dir indexing requires extra space as well */
316 if (ocfs2_supports_indexed_dirs(osb))
317 want_meta++;
318 }
319
320 status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac);
321 if (status < 0) {
322 if (status != -ENOSPC)
323 mlog_errno(status);
324 goto leave;
325 }
326
327 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
328 if (status < 0) {
329 if (status != -ENOSPC)
330 mlog_errno(status);
331 goto leave;
332 }
333
334 handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb,
335 S_ISDIR(mode),
336 xattr_credits));
337 if (IS_ERR(handle)) {
338 status = PTR_ERR(handle);
339 handle = NULL;
340 mlog_errno(status);
341 goto leave;
342 }
343
344 /* Starting to change things, restart is no longer possible. */
345 ocfs2_block_signals(&oldset);
346 did_block_signals = 1;
347
348 status = dquot_alloc_inode(inode);
349 if (status)
350 goto leave;
351 did_quota_inode = 1;
352
353 /* do the real work now. */
354 status = ocfs2_mknod_locked(osb, dir, inode, dev,
355 &new_fe_bh, parent_fe_bh, handle,
356 inode_ac);
357 if (status < 0) {
358 mlog_errno(status);
359 goto leave;
360 }
361
362 if (S_ISDIR(mode)) {
363 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
364 new_fe_bh, data_ac, meta_ac);
365 if (status < 0) {
366 mlog_errno(status);
367 goto leave;
368 }
369
370 status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
371 parent_fe_bh,
372 OCFS2_JOURNAL_ACCESS_WRITE);
373 if (status < 0) {
374 mlog_errno(status);
375 goto leave;
376 }
377 ocfs2_add_links_count(dirfe, 1);
378 ocfs2_journal_dirty(handle, parent_fe_bh);
379 inc_nlink(dir);
380 }
381
382 status = ocfs2_init_acl(handle, inode, dir, new_fe_bh, parent_fe_bh,
383 meta_ac, data_ac);
384 if (status < 0) {
385 mlog_errno(status);
386 goto leave;
387 }
388
389 if (si.enable) {
390 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
391 meta_ac, data_ac);
392 if (status < 0) {
393 mlog_errno(status);
394 goto leave;
395 }
396 }
397
398 /*
399 * Do this before adding the entry to the directory. We add
400 * also set d_op after success so that ->d_iput() will cleanup
401 * the dentry lock even if ocfs2_add_entry() fails below.
402 */
403 status = ocfs2_dentry_attach_lock(dentry, inode,
404 OCFS2_I(dir)->ip_blkno);
405 if (status) {
406 mlog_errno(status);
407 goto leave;
408 }
409
410 status = ocfs2_add_entry(handle, dentry, inode,
411 OCFS2_I(inode)->ip_blkno, parent_fe_bh,
412 &lookup);
413 if (status < 0) {
414 mlog_errno(status);
415 goto leave;
416 }
417
418 insert_inode_hash(inode);
419 d_instantiate(dentry, inode);
420 status = 0;
421 leave:
422 if (status < 0 && did_quota_inode)
423 dquot_free_inode(inode);
424 if (handle)
425 ocfs2_commit_trans(osb, handle);
426
427 ocfs2_inode_unlock(dir, 1);
428 if (did_block_signals)
429 ocfs2_unblock_signals(&oldset);
430
431 brelse(new_fe_bh);
432 brelse(parent_fe_bh);
433 kfree(si.name);
434 kfree(si.value);
435
436 ocfs2_free_dir_lookup_result(&lookup);
437
438 if (inode_ac)
439 ocfs2_free_alloc_context(inode_ac);
440
441 if (data_ac)
442 ocfs2_free_alloc_context(data_ac);
443
444 if (meta_ac)
445 ocfs2_free_alloc_context(meta_ac);
446
447 /*
448 * We should call iput after the i_mutex of the bitmap been
449 * unlocked in ocfs2_free_alloc_context, or the
450 * ocfs2_delete_inode will mutex_lock again.
451 */
452 if ((status < 0) && inode) {
453 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
454 clear_nlink(inode);
455 iput(inode);
456 }
457
458 if (status)
459 mlog_errno(status);
460
461 return status;
462 }
463
464 static int __ocfs2_mknod_locked(struct inode *dir,
465 struct inode *inode,
466 dev_t dev,
467 struct buffer_head **new_fe_bh,
468 struct buffer_head *parent_fe_bh,
469 handle_t *handle,
470 struct ocfs2_alloc_context *inode_ac,
471 u64 fe_blkno, u64 suballoc_loc, u16 suballoc_bit)
472 {
473 int status = 0;
474 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
475 struct ocfs2_dinode *fe = NULL;
476 struct ocfs2_extent_list *fel;
477 u16 feat;
478
479 *new_fe_bh = NULL;
480
481 /* populate as many fields early on as possible - many of
482 * these are used by the support functions here and in
483 * callers. */
484 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
485 OCFS2_I(inode)->ip_blkno = fe_blkno;
486 spin_lock(&osb->osb_lock);
487 inode->i_generation = osb->s_next_generation++;
488 spin_unlock(&osb->osb_lock);
489
490 *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
491 if (!*new_fe_bh) {
492 status = -EIO;
493 mlog_errno(status);
494 goto leave;
495 }
496 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), *new_fe_bh);
497
498 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
499 *new_fe_bh,
500 OCFS2_JOURNAL_ACCESS_CREATE);
501 if (status < 0) {
502 mlog_errno(status);
503 goto leave;
504 }
505
506 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
507 memset(fe, 0, osb->sb->s_blocksize);
508
509 fe->i_generation = cpu_to_le32(inode->i_generation);
510 fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
511 fe->i_blkno = cpu_to_le64(fe_blkno);
512 fe->i_suballoc_loc = cpu_to_le64(suballoc_loc);
513 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
514 fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot);
515 fe->i_uid = cpu_to_le32(inode->i_uid);
516 fe->i_gid = cpu_to_le32(inode->i_gid);
517 fe->i_mode = cpu_to_le16(inode->i_mode);
518 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
519 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
520
521 ocfs2_set_links_count(fe, inode->i_nlink);
522
523 fe->i_last_eb_blk = 0;
524 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
525 le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
526 fe->i_atime = fe->i_ctime = fe->i_mtime =
527 cpu_to_le64(CURRENT_TIME.tv_sec);
528 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
529 cpu_to_le32(CURRENT_TIME.tv_nsec);
530 fe->i_dtime = 0;
531
532 /*
533 * If supported, directories start with inline data. If inline
534 * isn't supported, but indexing is, we start them as indexed.
535 */
536 feat = le16_to_cpu(fe->i_dyn_features);
537 if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
538 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
539
540 fe->id2.i_data.id_count = cpu_to_le16(
541 ocfs2_max_inline_data_with_xattr(osb->sb, fe));
542 } else {
543 fel = &fe->id2.i_list;
544 fel->l_tree_depth = 0;
545 fel->l_next_free_rec = 0;
546 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
547 }
548
549 ocfs2_journal_dirty(handle, *new_fe_bh);
550
551 ocfs2_populate_inode(inode, fe, 1);
552 ocfs2_ci_set_new(osb, INODE_CACHE(inode));
553 if (!ocfs2_mount_local(osb)) {
554 status = ocfs2_create_new_inode_locks(inode);
555 if (status < 0)
556 mlog_errno(status);
557 }
558
559 status = 0; /* error in ocfs2_create_new_inode_locks is not
560 * critical */
561
562 leave:
563 if (status < 0) {
564 if (*new_fe_bh) {
565 brelse(*new_fe_bh);
566 *new_fe_bh = NULL;
567 }
568 }
569
570 if (status)
571 mlog_errno(status);
572 return status;
573 }
574
575 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
576 struct inode *dir,
577 struct inode *inode,
578 dev_t dev,
579 struct buffer_head **new_fe_bh,
580 struct buffer_head *parent_fe_bh,
581 handle_t *handle,
582 struct ocfs2_alloc_context *inode_ac)
583 {
584 int status = 0;
585 u64 suballoc_loc, fe_blkno = 0;
586 u16 suballoc_bit;
587
588 *new_fe_bh = NULL;
589
590 status = ocfs2_claim_new_inode(handle, dir, parent_fe_bh,
591 inode_ac, &suballoc_loc,
592 &suballoc_bit, &fe_blkno);
593 if (status < 0) {
594 mlog_errno(status);
595 return status;
596 }
597
598 return __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
599 parent_fe_bh, handle, inode_ac,
600 fe_blkno, suballoc_loc, suballoc_bit);
601 }
602
603 static int ocfs2_mkdir(struct inode *dir,
604 struct dentry *dentry,
605 umode_t mode)
606 {
607 int ret;
608
609 trace_ocfs2_mkdir(dir, dentry, dentry->d_name.len, dentry->d_name.name,
610 OCFS2_I(dir)->ip_blkno, mode);
611 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
612 if (ret)
613 mlog_errno(ret);
614
615 return ret;
616 }
617
618 static int ocfs2_create(struct inode *dir,
619 struct dentry *dentry,
620 umode_t mode,
621 struct nameidata *nd)
622 {
623 int ret;
624
625 trace_ocfs2_create(dir, dentry, dentry->d_name.len, dentry->d_name.name,
626 (unsigned long long)OCFS2_I(dir)->ip_blkno, mode);
627 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
628 if (ret)
629 mlog_errno(ret);
630
631 return ret;
632 }
633
634 static int ocfs2_link(struct dentry *old_dentry,
635 struct inode *dir,
636 struct dentry *dentry)
637 {
638 handle_t *handle;
639 struct inode *inode = old_dentry->d_inode;
640 int err;
641 struct buffer_head *fe_bh = NULL;
642 struct buffer_head *parent_fe_bh = NULL;
643 struct ocfs2_dinode *fe = NULL;
644 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
645 struct ocfs2_dir_lookup_result lookup = { NULL, };
646 sigset_t oldset;
647
648 trace_ocfs2_link((unsigned long long)OCFS2_I(inode)->ip_blkno,
649 old_dentry->d_name.len, old_dentry->d_name.name,
650 dentry->d_name.len, dentry->d_name.name);
651
652 if (S_ISDIR(inode->i_mode))
653 return -EPERM;
654
655 dquot_initialize(dir);
656
657 err = ocfs2_inode_lock_nested(dir, &parent_fe_bh, 1, OI_LS_PARENT);
658 if (err < 0) {
659 if (err != -ENOENT)
660 mlog_errno(err);
661 return err;
662 }
663
664 if (!dir->i_nlink) {
665 err = -ENOENT;
666 goto out;
667 }
668
669 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
670 dentry->d_name.len);
671 if (err)
672 goto out;
673
674 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
675 dentry->d_name.name,
676 dentry->d_name.len, &lookup);
677 if (err < 0) {
678 mlog_errno(err);
679 goto out;
680 }
681
682 err = ocfs2_inode_lock(inode, &fe_bh, 1);
683 if (err < 0) {
684 if (err != -ENOENT)
685 mlog_errno(err);
686 goto out;
687 }
688
689 fe = (struct ocfs2_dinode *) fe_bh->b_data;
690 if (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) {
691 err = -EMLINK;
692 goto out_unlock_inode;
693 }
694
695 handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb));
696 if (IS_ERR(handle)) {
697 err = PTR_ERR(handle);
698 handle = NULL;
699 mlog_errno(err);
700 goto out_unlock_inode;
701 }
702
703 /* Starting to change things, restart is no longer possible. */
704 ocfs2_block_signals(&oldset);
705
706 err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
707 OCFS2_JOURNAL_ACCESS_WRITE);
708 if (err < 0) {
709 mlog_errno(err);
710 goto out_commit;
711 }
712
713 inc_nlink(inode);
714 inode->i_ctime = CURRENT_TIME;
715 ocfs2_set_links_count(fe, inode->i_nlink);
716 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
717 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
718 ocfs2_journal_dirty(handle, fe_bh);
719
720 err = ocfs2_add_entry(handle, dentry, inode,
721 OCFS2_I(inode)->ip_blkno,
722 parent_fe_bh, &lookup);
723 if (err) {
724 ocfs2_add_links_count(fe, -1);
725 drop_nlink(inode);
726 mlog_errno(err);
727 goto out_commit;
728 }
729
730 err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
731 if (err) {
732 mlog_errno(err);
733 goto out_commit;
734 }
735
736 ihold(inode);
737 d_instantiate(dentry, inode);
738
739 out_commit:
740 ocfs2_commit_trans(osb, handle);
741 ocfs2_unblock_signals(&oldset);
742 out_unlock_inode:
743 ocfs2_inode_unlock(inode, 1);
744
745 out:
746 ocfs2_inode_unlock(dir, 1);
747
748 brelse(fe_bh);
749 brelse(parent_fe_bh);
750
751 ocfs2_free_dir_lookup_result(&lookup);
752
753 if (err)
754 mlog_errno(err);
755
756 return err;
757 }
758
759 /*
760 * Takes and drops an exclusive lock on the given dentry. This will
761 * force other nodes to drop it.
762 */
763 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
764 {
765 int ret;
766
767 ret = ocfs2_dentry_lock(dentry, 1);
768 if (ret)
769 mlog_errno(ret);
770 else
771 ocfs2_dentry_unlock(dentry, 1);
772
773 return ret;
774 }
775
776 static inline int inode_is_unlinkable(struct inode *inode)
777 {
778 if (S_ISDIR(inode->i_mode)) {
779 if (inode->i_nlink == 2)
780 return 1;
781 return 0;
782 }
783
784 if (inode->i_nlink == 1)
785 return 1;
786 return 0;
787 }
788
789 static int ocfs2_unlink(struct inode *dir,
790 struct dentry *dentry)
791 {
792 int status;
793 int child_locked = 0;
794 struct inode *inode = dentry->d_inode;
795 struct inode *orphan_dir = NULL;
796 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
797 u64 blkno;
798 struct ocfs2_dinode *fe = NULL;
799 struct buffer_head *fe_bh = NULL;
800 struct buffer_head *parent_node_bh = NULL;
801 handle_t *handle = NULL;
802 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
803 struct ocfs2_dir_lookup_result lookup = { NULL, };
804 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
805
806 trace_ocfs2_unlink(dir, dentry, dentry->d_name.len,
807 dentry->d_name.name,
808 (unsigned long long)OCFS2_I(dir)->ip_blkno,
809 (unsigned long long)OCFS2_I(inode)->ip_blkno);
810
811 dquot_initialize(dir);
812
813 BUG_ON(dentry->d_parent->d_inode != dir);
814
815 if (inode == osb->root_inode)
816 return -EPERM;
817
818 status = ocfs2_inode_lock_nested(dir, &parent_node_bh, 1,
819 OI_LS_PARENT);
820 if (status < 0) {
821 if (status != -ENOENT)
822 mlog_errno(status);
823 return status;
824 }
825
826 status = ocfs2_find_files_on_disk(dentry->d_name.name,
827 dentry->d_name.len, &blkno, dir,
828 &lookup);
829 if (status < 0) {
830 if (status != -ENOENT)
831 mlog_errno(status);
832 goto leave;
833 }
834
835 if (OCFS2_I(inode)->ip_blkno != blkno) {
836 status = -ENOENT;
837
838 trace_ocfs2_unlink_noent(
839 (unsigned long long)OCFS2_I(inode)->ip_blkno,
840 (unsigned long long)blkno,
841 OCFS2_I(inode)->ip_flags);
842 goto leave;
843 }
844
845 status = ocfs2_inode_lock(inode, &fe_bh, 1);
846 if (status < 0) {
847 if (status != -ENOENT)
848 mlog_errno(status);
849 goto leave;
850 }
851 child_locked = 1;
852
853 if (S_ISDIR(inode->i_mode)) {
854 if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
855 status = -ENOTEMPTY;
856 goto leave;
857 }
858 }
859
860 status = ocfs2_remote_dentry_delete(dentry);
861 if (status < 0) {
862 /* This remote delete should succeed under all normal
863 * circumstances. */
864 mlog_errno(status);
865 goto leave;
866 }
867
868 if (inode_is_unlinkable(inode)) {
869 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
870 OCFS2_I(inode)->ip_blkno,
871 orphan_name, &orphan_insert);
872 if (status < 0) {
873 mlog_errno(status);
874 goto leave;
875 }
876 }
877
878 handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb));
879 if (IS_ERR(handle)) {
880 status = PTR_ERR(handle);
881 handle = NULL;
882 mlog_errno(status);
883 goto leave;
884 }
885
886 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
887 OCFS2_JOURNAL_ACCESS_WRITE);
888 if (status < 0) {
889 mlog_errno(status);
890 goto leave;
891 }
892
893 fe = (struct ocfs2_dinode *) fe_bh->b_data;
894
895 if (inode_is_unlinkable(inode)) {
896 status = ocfs2_orphan_add(osb, handle, inode, fe_bh, orphan_name,
897 &orphan_insert, orphan_dir);
898 if (status < 0) {
899 mlog_errno(status);
900 goto leave;
901 }
902 }
903
904 /* delete the name from the parent dir */
905 status = ocfs2_delete_entry(handle, dir, &lookup);
906 if (status < 0) {
907 mlog_errno(status);
908 goto leave;
909 }
910
911 if (S_ISDIR(inode->i_mode))
912 drop_nlink(inode);
913 drop_nlink(inode);
914 ocfs2_set_links_count(fe, inode->i_nlink);
915 ocfs2_journal_dirty(handle, fe_bh);
916
917 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
918 if (S_ISDIR(inode->i_mode))
919 drop_nlink(dir);
920
921 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
922 if (status < 0) {
923 mlog_errno(status);
924 if (S_ISDIR(inode->i_mode))
925 inc_nlink(dir);
926 }
927
928 leave:
929 if (handle)
930 ocfs2_commit_trans(osb, handle);
931
932 if (child_locked)
933 ocfs2_inode_unlock(inode, 1);
934
935 ocfs2_inode_unlock(dir, 1);
936
937 if (orphan_dir) {
938 /* This was locked for us in ocfs2_prepare_orphan_dir() */
939 ocfs2_inode_unlock(orphan_dir, 1);
940 mutex_unlock(&orphan_dir->i_mutex);
941 iput(orphan_dir);
942 }
943
944 brelse(fe_bh);
945 brelse(parent_node_bh);
946
947 ocfs2_free_dir_lookup_result(&orphan_insert);
948 ocfs2_free_dir_lookup_result(&lookup);
949
950 if (status)
951 mlog_errno(status);
952
953 return status;
954 }
955
956 /*
957 * The only place this should be used is rename!
958 * if they have the same id, then the 1st one is the only one locked.
959 */
960 static int ocfs2_double_lock(struct ocfs2_super *osb,
961 struct buffer_head **bh1,
962 struct inode *inode1,
963 struct buffer_head **bh2,
964 struct inode *inode2)
965 {
966 int status;
967 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
968 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
969 struct buffer_head **tmpbh;
970 struct inode *tmpinode;
971
972 trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno,
973 (unsigned long long)oi2->ip_blkno);
974
975 if (*bh1)
976 *bh1 = NULL;
977 if (*bh2)
978 *bh2 = NULL;
979
980 /* we always want to lock the one with the lower lockid first. */
981 if (oi1->ip_blkno != oi2->ip_blkno) {
982 if (oi1->ip_blkno < oi2->ip_blkno) {
983 /* switch id1 and id2 around */
984 tmpbh = bh2;
985 bh2 = bh1;
986 bh1 = tmpbh;
987
988 tmpinode = inode2;
989 inode2 = inode1;
990 inode1 = tmpinode;
991 }
992 /* lock id2 */
993 status = ocfs2_inode_lock_nested(inode2, bh2, 1,
994 OI_LS_RENAME1);
995 if (status < 0) {
996 if (status != -ENOENT)
997 mlog_errno(status);
998 goto bail;
999 }
1000 }
1001
1002 /* lock id1 */
1003 status = ocfs2_inode_lock_nested(inode1, bh1, 1, OI_LS_RENAME2);
1004 if (status < 0) {
1005 /*
1006 * An error return must mean that no cluster locks
1007 * were held on function exit.
1008 */
1009 if (oi1->ip_blkno != oi2->ip_blkno) {
1010 ocfs2_inode_unlock(inode2, 1);
1011 brelse(*bh2);
1012 *bh2 = NULL;
1013 }
1014
1015 if (status != -ENOENT)
1016 mlog_errno(status);
1017 }
1018
1019 trace_ocfs2_double_lock_end(
1020 (unsigned long long)OCFS2_I(inode1)->ip_blkno,
1021 (unsigned long long)OCFS2_I(inode2)->ip_blkno);
1022
1023 bail:
1024 if (status)
1025 mlog_errno(status);
1026 return status;
1027 }
1028
1029 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1030 {
1031 ocfs2_inode_unlock(inode1, 1);
1032
1033 if (inode1 != inode2)
1034 ocfs2_inode_unlock(inode2, 1);
1035 }
1036
1037 static int ocfs2_rename(struct inode *old_dir,
1038 struct dentry *old_dentry,
1039 struct inode *new_dir,
1040 struct dentry *new_dentry)
1041 {
1042 int status = 0, rename_lock = 0, parents_locked = 0, target_exists = 0;
1043 int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 0;
1044 struct inode *old_inode = old_dentry->d_inode;
1045 struct inode *new_inode = new_dentry->d_inode;
1046 struct inode *orphan_dir = NULL;
1047 struct ocfs2_dinode *newfe = NULL;
1048 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1049 struct buffer_head *newfe_bh = NULL;
1050 struct buffer_head *old_inode_bh = NULL;
1051 struct ocfs2_super *osb = NULL;
1052 u64 newfe_blkno, old_de_ino;
1053 handle_t *handle = NULL;
1054 struct buffer_head *old_dir_bh = NULL;
1055 struct buffer_head *new_dir_bh = NULL;
1056 nlink_t old_dir_nlink = old_dir->i_nlink;
1057 struct ocfs2_dinode *old_di;
1058 struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
1059 struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
1060 struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
1061 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
1062 struct ocfs2_dir_lookup_result target_insert = { NULL, };
1063
1064 /* At some point it might be nice to break this function up a
1065 * bit. */
1066
1067 trace_ocfs2_rename(old_dir, old_dentry, new_dir, new_dentry,
1068 old_dentry->d_name.len, old_dentry->d_name.name,
1069 new_dentry->d_name.len, new_dentry->d_name.name);
1070
1071 dquot_initialize(old_dir);
1072 dquot_initialize(new_dir);
1073
1074 osb = OCFS2_SB(old_dir->i_sb);
1075
1076 if (new_inode) {
1077 if (!igrab(new_inode))
1078 BUG();
1079 }
1080
1081 /* Assume a directory hierarchy thusly:
1082 * a/b/c
1083 * a/d
1084 * a,b,c, and d are all directories.
1085 *
1086 * from cwd of 'a' on both nodes:
1087 * node1: mv b/c d
1088 * node2: mv d b/c
1089 *
1090 * And that's why, just like the VFS, we need a file system
1091 * rename lock. */
1092 if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
1093 status = ocfs2_rename_lock(osb);
1094 if (status < 0) {
1095 mlog_errno(status);
1096 goto bail;
1097 }
1098 rename_lock = 1;
1099 }
1100
1101 /* if old and new are the same, this'll just do one lock. */
1102 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1103 &new_dir_bh, new_dir);
1104 if (status < 0) {
1105 mlog_errno(status);
1106 goto bail;
1107 }
1108 parents_locked = 1;
1109
1110 /* make sure both dirs have bhs
1111 * get an extra ref on old_dir_bh if old==new */
1112 if (!new_dir_bh) {
1113 if (old_dir_bh) {
1114 new_dir_bh = old_dir_bh;
1115 get_bh(new_dir_bh);
1116 } else {
1117 mlog(ML_ERROR, "no old_dir_bh!\n");
1118 status = -EIO;
1119 goto bail;
1120 }
1121 }
1122
1123 /*
1124 * Aside from allowing a meta data update, the locking here
1125 * also ensures that the downconvert thread on other nodes
1126 * won't have to concurrently downconvert the inode and the
1127 * dentry locks.
1128 */
1129 status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
1130 OI_LS_PARENT);
1131 if (status < 0) {
1132 if (status != -ENOENT)
1133 mlog_errno(status);
1134 goto bail;
1135 }
1136 old_child_locked = 1;
1137
1138 status = ocfs2_remote_dentry_delete(old_dentry);
1139 if (status < 0) {
1140 mlog_errno(status);
1141 goto bail;
1142 }
1143
1144 if (S_ISDIR(old_inode->i_mode)) {
1145 u64 old_inode_parent;
1146
1147 update_dot_dot = 1;
1148 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1149 old_inode,
1150 &old_inode_dot_dot_res);
1151 if (status) {
1152 status = -EIO;
1153 goto bail;
1154 }
1155
1156 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1157 status = -EIO;
1158 goto bail;
1159 }
1160
1161 if (!new_inode && new_dir != old_dir &&
1162 new_dir->i_nlink >= ocfs2_link_max(osb)) {
1163 status = -EMLINK;
1164 goto bail;
1165 }
1166 }
1167
1168 status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1169 old_dentry->d_name.len,
1170 &old_de_ino);
1171 if (status) {
1172 status = -ENOENT;
1173 goto bail;
1174 }
1175
1176 /*
1177 * Check for inode number is _not_ due to possible IO errors.
1178 * We might rmdir the source, keep it as pwd of some process
1179 * and merrily kill the link to whatever was created under the
1180 * same name. Goodbye sticky bit ;-<
1181 */
1182 if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1183 status = -ENOENT;
1184 goto bail;
1185 }
1186
1187 /* check if the target already exists (in which case we need
1188 * to delete it */
1189 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1190 new_dentry->d_name.len,
1191 &newfe_blkno, new_dir,
1192 &target_lookup_res);
1193 /* The only error we allow here is -ENOENT because the new
1194 * file not existing is perfectly valid. */
1195 if ((status < 0) && (status != -ENOENT)) {
1196 /* If we cannot find the file specified we should just */
1197 /* return the error... */
1198 mlog_errno(status);
1199 goto bail;
1200 }
1201 if (status == 0)
1202 target_exists = 1;
1203
1204 if (!target_exists && new_inode) {
1205 /*
1206 * Target was unlinked by another node while we were
1207 * waiting to get to ocfs2_rename(). There isn't
1208 * anything we can do here to help the situation, so
1209 * bubble up the appropriate error.
1210 */
1211 status = -ENOENT;
1212 goto bail;
1213 }
1214
1215 /* In case we need to overwrite an existing file, we blow it
1216 * away first */
1217 if (target_exists) {
1218 /* VFS didn't think there existed an inode here, but
1219 * someone else in the cluster must have raced our
1220 * rename to create one. Today we error cleanly, in
1221 * the future we should consider calling iget to build
1222 * a new struct inode for this entry. */
1223 if (!new_inode) {
1224 status = -EACCES;
1225
1226 trace_ocfs2_rename_target_exists(new_dentry->d_name.len,
1227 new_dentry->d_name.name);
1228 goto bail;
1229 }
1230
1231 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1232 status = -EACCES;
1233
1234 trace_ocfs2_rename_disagree(
1235 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1236 (unsigned long long)newfe_blkno,
1237 OCFS2_I(new_inode)->ip_flags);
1238 goto bail;
1239 }
1240
1241 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1242 if (status < 0) {
1243 if (status != -ENOENT)
1244 mlog_errno(status);
1245 goto bail;
1246 }
1247 new_child_locked = 1;
1248
1249 status = ocfs2_remote_dentry_delete(new_dentry);
1250 if (status < 0) {
1251 mlog_errno(status);
1252 goto bail;
1253 }
1254
1255 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1256
1257 trace_ocfs2_rename_over_existing(
1258 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1259 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1260
1261 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1262 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1263 OCFS2_I(new_inode)->ip_blkno,
1264 orphan_name, &orphan_insert);
1265 if (status < 0) {
1266 mlog_errno(status);
1267 goto bail;
1268 }
1269 }
1270 } else {
1271 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1272
1273 status = ocfs2_check_dir_for_entry(new_dir,
1274 new_dentry->d_name.name,
1275 new_dentry->d_name.len);
1276 if (status)
1277 goto bail;
1278
1279 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1280 new_dentry->d_name.name,
1281 new_dentry->d_name.len,
1282 &target_insert);
1283 if (status < 0) {
1284 mlog_errno(status);
1285 goto bail;
1286 }
1287 }
1288
1289 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
1290 if (IS_ERR(handle)) {
1291 status = PTR_ERR(handle);
1292 handle = NULL;
1293 mlog_errno(status);
1294 goto bail;
1295 }
1296
1297 if (target_exists) {
1298 if (S_ISDIR(new_inode->i_mode)) {
1299 if (new_inode->i_nlink != 2 ||
1300 !ocfs2_empty_dir(new_inode)) {
1301 status = -ENOTEMPTY;
1302 goto bail;
1303 }
1304 }
1305 status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
1306 newfe_bh,
1307 OCFS2_JOURNAL_ACCESS_WRITE);
1308 if (status < 0) {
1309 mlog_errno(status);
1310 goto bail;
1311 }
1312
1313 if (S_ISDIR(new_inode->i_mode) ||
1314 (ocfs2_read_links_count(newfe) == 1)) {
1315 status = ocfs2_orphan_add(osb, handle, new_inode,
1316 newfe_bh, orphan_name,
1317 &orphan_insert, orphan_dir);
1318 if (status < 0) {
1319 mlog_errno(status);
1320 goto bail;
1321 }
1322 }
1323
1324 /* change the dirent to point to the correct inode */
1325 status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
1326 old_inode);
1327 if (status < 0) {
1328 mlog_errno(status);
1329 goto bail;
1330 }
1331 new_dir->i_version++;
1332
1333 if (S_ISDIR(new_inode->i_mode))
1334 ocfs2_set_links_count(newfe, 0);
1335 else
1336 ocfs2_add_links_count(newfe, -1);
1337 ocfs2_journal_dirty(handle, newfe_bh);
1338 } else {
1339 /* if the name was not found in new_dir, add it now */
1340 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1341 OCFS2_I(old_inode)->ip_blkno,
1342 new_dir_bh, &target_insert);
1343 }
1344
1345 old_inode->i_ctime = CURRENT_TIME;
1346 mark_inode_dirty(old_inode);
1347
1348 status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode),
1349 old_inode_bh,
1350 OCFS2_JOURNAL_ACCESS_WRITE);
1351 if (status >= 0) {
1352 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1353
1354 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1355 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1356 ocfs2_journal_dirty(handle, old_inode_bh);
1357 } else
1358 mlog_errno(status);
1359
1360 /*
1361 * Now that the name has been added to new_dir, remove the old name.
1362 *
1363 * We don't keep any directory entry context around until now
1364 * because the insert might have changed the type of directory
1365 * we're dealing with.
1366 */
1367 status = ocfs2_find_entry(old_dentry->d_name.name,
1368 old_dentry->d_name.len, old_dir,
1369 &old_entry_lookup);
1370 if (status)
1371 goto bail;
1372
1373 status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
1374 if (status < 0) {
1375 mlog_errno(status);
1376 goto bail;
1377 }
1378
1379 if (new_inode) {
1380 drop_nlink(new_inode);
1381 new_inode->i_ctime = CURRENT_TIME;
1382 }
1383 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1384
1385 if (update_dot_dot) {
1386 status = ocfs2_update_entry(old_inode, handle,
1387 &old_inode_dot_dot_res, new_dir);
1388 drop_nlink(old_dir);
1389 if (new_inode) {
1390 drop_nlink(new_inode);
1391 } else {
1392 inc_nlink(new_dir);
1393 mark_inode_dirty(new_dir);
1394 }
1395 }
1396 mark_inode_dirty(old_dir);
1397 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1398 if (new_inode) {
1399 mark_inode_dirty(new_inode);
1400 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1401 }
1402
1403 if (old_dir != new_dir) {
1404 /* Keep the same times on both directories.*/
1405 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1406
1407 /*
1408 * This will also pick up the i_nlink change from the
1409 * block above.
1410 */
1411 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1412 }
1413
1414 if (old_dir_nlink != old_dir->i_nlink) {
1415 if (!old_dir_bh) {
1416 mlog(ML_ERROR, "need to change nlink for old dir "
1417 "%llu from %d to %d but bh is NULL!\n",
1418 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1419 (int)old_dir_nlink, old_dir->i_nlink);
1420 } else {
1421 struct ocfs2_dinode *fe;
1422 status = ocfs2_journal_access_di(handle,
1423 INODE_CACHE(old_dir),
1424 old_dir_bh,
1425 OCFS2_JOURNAL_ACCESS_WRITE);
1426 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1427 ocfs2_set_links_count(fe, old_dir->i_nlink);
1428 ocfs2_journal_dirty(handle, old_dir_bh);
1429 }
1430 }
1431 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1432 status = 0;
1433 bail:
1434 if (rename_lock)
1435 ocfs2_rename_unlock(osb);
1436
1437 if (handle)
1438 ocfs2_commit_trans(osb, handle);
1439
1440 if (parents_locked)
1441 ocfs2_double_unlock(old_dir, new_dir);
1442
1443 if (old_child_locked)
1444 ocfs2_inode_unlock(old_inode, 1);
1445
1446 if (new_child_locked)
1447 ocfs2_inode_unlock(new_inode, 1);
1448
1449 if (orphan_dir) {
1450 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1451 ocfs2_inode_unlock(orphan_dir, 1);
1452 mutex_unlock(&orphan_dir->i_mutex);
1453 iput(orphan_dir);
1454 }
1455
1456 if (new_inode)
1457 sync_mapping_buffers(old_inode->i_mapping);
1458
1459 if (new_inode)
1460 iput(new_inode);
1461
1462 ocfs2_free_dir_lookup_result(&target_lookup_res);
1463 ocfs2_free_dir_lookup_result(&old_entry_lookup);
1464 ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
1465 ocfs2_free_dir_lookup_result(&orphan_insert);
1466 ocfs2_free_dir_lookup_result(&target_insert);
1467
1468 brelse(newfe_bh);
1469 brelse(old_inode_bh);
1470 brelse(old_dir_bh);
1471 brelse(new_dir_bh);
1472
1473 if (status)
1474 mlog_errno(status);
1475
1476 return status;
1477 }
1478
1479 /*
1480 * we expect i_size = strlen(symname). Copy symname into the file
1481 * data, including the null terminator.
1482 */
1483 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1484 handle_t *handle,
1485 struct inode *inode,
1486 const char *symname)
1487 {
1488 struct buffer_head **bhs = NULL;
1489 const char *c;
1490 struct super_block *sb = osb->sb;
1491 u64 p_blkno, p_blocks;
1492 int virtual, blocks, status, i, bytes_left;
1493
1494 bytes_left = i_size_read(inode) + 1;
1495 /* we can't trust i_blocks because we're actually going to
1496 * write i_size + 1 bytes. */
1497 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1498
1499 trace_ocfs2_create_symlink_data((unsigned long long)inode->i_blocks,
1500 i_size_read(inode), blocks);
1501
1502 /* Sanity check -- make sure we're going to fit. */
1503 if (bytes_left >
1504 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1505 status = -EIO;
1506 mlog_errno(status);
1507 goto bail;
1508 }
1509
1510 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1511 if (!bhs) {
1512 status = -ENOMEM;
1513 mlog_errno(status);
1514 goto bail;
1515 }
1516
1517 status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1518 NULL);
1519 if (status < 0) {
1520 mlog_errno(status);
1521 goto bail;
1522 }
1523
1524 /* links can never be larger than one cluster so we know this
1525 * is all going to be contiguous, but do a sanity check
1526 * anyway. */
1527 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1528 status = -EIO;
1529 mlog_errno(status);
1530 goto bail;
1531 }
1532
1533 virtual = 0;
1534 while(bytes_left > 0) {
1535 c = &symname[virtual * sb->s_blocksize];
1536
1537 bhs[virtual] = sb_getblk(sb, p_blkno);
1538 if (!bhs[virtual]) {
1539 status = -ENOMEM;
1540 mlog_errno(status);
1541 goto bail;
1542 }
1543 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode),
1544 bhs[virtual]);
1545
1546 status = ocfs2_journal_access(handle, INODE_CACHE(inode),
1547 bhs[virtual],
1548 OCFS2_JOURNAL_ACCESS_CREATE);
1549 if (status < 0) {
1550 mlog_errno(status);
1551 goto bail;
1552 }
1553
1554 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1555
1556 memcpy(bhs[virtual]->b_data, c,
1557 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1558 bytes_left);
1559
1560 ocfs2_journal_dirty(handle, bhs[virtual]);
1561
1562 virtual++;
1563 p_blkno++;
1564 bytes_left -= sb->s_blocksize;
1565 }
1566
1567 status = 0;
1568 bail:
1569
1570 if (bhs) {
1571 for(i = 0; i < blocks; i++)
1572 brelse(bhs[i]);
1573 kfree(bhs);
1574 }
1575
1576 if (status)
1577 mlog_errno(status);
1578 return status;
1579 }
1580
1581 static int ocfs2_symlink(struct inode *dir,
1582 struct dentry *dentry,
1583 const char *symname)
1584 {
1585 int status, l, credits;
1586 u64 newsize;
1587 struct ocfs2_super *osb = NULL;
1588 struct inode *inode = NULL;
1589 struct super_block *sb;
1590 struct buffer_head *new_fe_bh = NULL;
1591 struct buffer_head *parent_fe_bh = NULL;
1592 struct ocfs2_dinode *fe = NULL;
1593 struct ocfs2_dinode *dirfe;
1594 handle_t *handle = NULL;
1595 struct ocfs2_alloc_context *inode_ac = NULL;
1596 struct ocfs2_alloc_context *data_ac = NULL;
1597 struct ocfs2_alloc_context *xattr_ac = NULL;
1598 int want_clusters = 0;
1599 int xattr_credits = 0;
1600 struct ocfs2_security_xattr_info si = {
1601 .enable = 1,
1602 };
1603 int did_quota = 0, did_quota_inode = 0;
1604 struct ocfs2_dir_lookup_result lookup = { NULL, };
1605 sigset_t oldset;
1606 int did_block_signals = 0;
1607
1608 trace_ocfs2_symlink_begin(dir, dentry, symname,
1609 dentry->d_name.len, dentry->d_name.name);
1610
1611 dquot_initialize(dir);
1612
1613 sb = dir->i_sb;
1614 osb = OCFS2_SB(sb);
1615
1616 l = strlen(symname) + 1;
1617
1618 credits = ocfs2_calc_symlink_credits(sb);
1619
1620 /* lock the parent directory */
1621 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1622 if (status < 0) {
1623 if (status != -ENOENT)
1624 mlog_errno(status);
1625 return status;
1626 }
1627
1628 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1629 if (!ocfs2_read_links_count(dirfe)) {
1630 /* can't make a file in a deleted directory. */
1631 status = -ENOENT;
1632 goto bail;
1633 }
1634
1635 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1636 dentry->d_name.len);
1637 if (status)
1638 goto bail;
1639
1640 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1641 dentry->d_name.name,
1642 dentry->d_name.len, &lookup);
1643 if (status < 0) {
1644 mlog_errno(status);
1645 goto bail;
1646 }
1647
1648 status = ocfs2_reserve_new_inode(osb, &inode_ac);
1649 if (status < 0) {
1650 if (status != -ENOSPC)
1651 mlog_errno(status);
1652 goto bail;
1653 }
1654
1655 inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
1656 if (!inode) {
1657 status = -ENOMEM;
1658 mlog_errno(status);
1659 goto bail;
1660 }
1661
1662 /* get security xattr */
1663 status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
1664 if (status) {
1665 if (status == -EOPNOTSUPP)
1666 si.enable = 0;
1667 else {
1668 mlog_errno(status);
1669 goto bail;
1670 }
1671 }
1672
1673 /* calculate meta data/clusters for setting security xattr */
1674 if (si.enable) {
1675 status = ocfs2_calc_security_init(dir, &si, &want_clusters,
1676 &xattr_credits, &xattr_ac);
1677 if (status < 0) {
1678 mlog_errno(status);
1679 goto bail;
1680 }
1681 }
1682
1683 /* don't reserve bitmap space for fast symlinks. */
1684 if (l > ocfs2_fast_symlink_chars(sb))
1685 want_clusters += 1;
1686
1687 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
1688 if (status < 0) {
1689 if (status != -ENOSPC)
1690 mlog_errno(status);
1691 goto bail;
1692 }
1693
1694 handle = ocfs2_start_trans(osb, credits + xattr_credits);
1695 if (IS_ERR(handle)) {
1696 status = PTR_ERR(handle);
1697 handle = NULL;
1698 mlog_errno(status);
1699 goto bail;
1700 }
1701
1702 /* Starting to change things, restart is no longer possible. */
1703 ocfs2_block_signals(&oldset);
1704 did_block_signals = 1;
1705
1706 status = dquot_alloc_inode(inode);
1707 if (status)
1708 goto bail;
1709 did_quota_inode = 1;
1710
1711 trace_ocfs2_symlink_create(dir, dentry, dentry->d_name.len,
1712 dentry->d_name.name,
1713 (unsigned long long)OCFS2_I(dir)->ip_blkno,
1714 inode->i_mode);
1715
1716 status = ocfs2_mknod_locked(osb, dir, inode,
1717 0, &new_fe_bh, parent_fe_bh, handle,
1718 inode_ac);
1719 if (status < 0) {
1720 mlog_errno(status);
1721 goto bail;
1722 }
1723
1724 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1725 inode->i_rdev = 0;
1726 newsize = l - 1;
1727 if (l > ocfs2_fast_symlink_chars(sb)) {
1728 u32 offset = 0;
1729
1730 inode->i_op = &ocfs2_symlink_inode_operations;
1731 status = dquot_alloc_space_nodirty(inode,
1732 ocfs2_clusters_to_bytes(osb->sb, 1));
1733 if (status)
1734 goto bail;
1735 did_quota = 1;
1736 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
1737 new_fe_bh,
1738 handle, data_ac, NULL,
1739 NULL);
1740 if (status < 0) {
1741 if (status != -ENOSPC && status != -EINTR) {
1742 mlog(ML_ERROR,
1743 "Failed to extend file to %llu\n",
1744 (unsigned long long)newsize);
1745 mlog_errno(status);
1746 status = -ENOSPC;
1747 }
1748 goto bail;
1749 }
1750 i_size_write(inode, newsize);
1751 inode->i_blocks = ocfs2_inode_sector_count(inode);
1752 } else {
1753 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1754 memcpy((char *) fe->id2.i_symlink, symname, l);
1755 i_size_write(inode, newsize);
1756 inode->i_blocks = 0;
1757 }
1758
1759 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1760 if (status < 0) {
1761 mlog_errno(status);
1762 goto bail;
1763 }
1764
1765 if (!ocfs2_inode_is_fast_symlink(inode)) {
1766 status = ocfs2_create_symlink_data(osb, handle, inode,
1767 symname);
1768 if (status < 0) {
1769 mlog_errno(status);
1770 goto bail;
1771 }
1772 }
1773
1774 if (si.enable) {
1775 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
1776 xattr_ac, data_ac);
1777 if (status < 0) {
1778 mlog_errno(status);
1779 goto bail;
1780 }
1781 }
1782
1783 /*
1784 * Do this before adding the entry to the directory. We add
1785 * also set d_op after success so that ->d_iput() will cleanup
1786 * the dentry lock even if ocfs2_add_entry() fails below.
1787 */
1788 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1789 if (status) {
1790 mlog_errno(status);
1791 goto bail;
1792 }
1793
1794 status = ocfs2_add_entry(handle, dentry, inode,
1795 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1796 &lookup);
1797 if (status < 0) {
1798 mlog_errno(status);
1799 goto bail;
1800 }
1801
1802 insert_inode_hash(inode);
1803 d_instantiate(dentry, inode);
1804 bail:
1805 if (status < 0 && did_quota)
1806 dquot_free_space_nodirty(inode,
1807 ocfs2_clusters_to_bytes(osb->sb, 1));
1808 if (status < 0 && did_quota_inode)
1809 dquot_free_inode(inode);
1810 if (handle)
1811 ocfs2_commit_trans(osb, handle);
1812
1813 ocfs2_inode_unlock(dir, 1);
1814 if (did_block_signals)
1815 ocfs2_unblock_signals(&oldset);
1816
1817 brelse(new_fe_bh);
1818 brelse(parent_fe_bh);
1819 kfree(si.name);
1820 kfree(si.value);
1821 ocfs2_free_dir_lookup_result(&lookup);
1822 if (inode_ac)
1823 ocfs2_free_alloc_context(inode_ac);
1824 if (data_ac)
1825 ocfs2_free_alloc_context(data_ac);
1826 if (xattr_ac)
1827 ocfs2_free_alloc_context(xattr_ac);
1828 if ((status < 0) && inode) {
1829 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
1830 clear_nlink(inode);
1831 iput(inode);
1832 }
1833
1834 if (status)
1835 mlog_errno(status);
1836
1837 return status;
1838 }
1839
1840 static int ocfs2_blkno_stringify(u64 blkno, char *name)
1841 {
1842 int status, namelen;
1843
1844 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1845 (long long)blkno);
1846 if (namelen <= 0) {
1847 if (namelen)
1848 status = namelen;
1849 else
1850 status = -EINVAL;
1851 mlog_errno(status);
1852 goto bail;
1853 }
1854 if (namelen != OCFS2_ORPHAN_NAMELEN) {
1855 status = -EINVAL;
1856 mlog_errno(status);
1857 goto bail;
1858 }
1859
1860 trace_ocfs2_blkno_stringify(blkno, name, namelen);
1861
1862 status = 0;
1863 bail:
1864 if (status < 0)
1865 mlog_errno(status);
1866 return status;
1867 }
1868
1869 static int ocfs2_lookup_lock_orphan_dir(struct ocfs2_super *osb,
1870 struct inode **ret_orphan_dir,
1871 struct buffer_head **ret_orphan_dir_bh)
1872 {
1873 struct inode *orphan_dir_inode;
1874 struct buffer_head *orphan_dir_bh = NULL;
1875 int ret = 0;
1876
1877 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
1878 ORPHAN_DIR_SYSTEM_INODE,
1879 osb->slot_num);
1880 if (!orphan_dir_inode) {
1881 ret = -ENOENT;
1882 mlog_errno(ret);
1883 return ret;
1884 }
1885
1886 mutex_lock(&orphan_dir_inode->i_mutex);
1887
1888 ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
1889 if (ret < 0) {
1890 mutex_unlock(&orphan_dir_inode->i_mutex);
1891 iput(orphan_dir_inode);
1892
1893 mlog_errno(ret);
1894 return ret;
1895 }
1896
1897 *ret_orphan_dir = orphan_dir_inode;
1898 *ret_orphan_dir_bh = orphan_dir_bh;
1899
1900 return 0;
1901 }
1902
1903 static int __ocfs2_prepare_orphan_dir(struct inode *orphan_dir_inode,
1904 struct buffer_head *orphan_dir_bh,
1905 u64 blkno,
1906 char *name,
1907 struct ocfs2_dir_lookup_result *lookup)
1908 {
1909 int ret;
1910 struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);
1911
1912 ret = ocfs2_blkno_stringify(blkno, name);
1913 if (ret < 0) {
1914 mlog_errno(ret);
1915 return ret;
1916 }
1917
1918 ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
1919 orphan_dir_bh, name,
1920 OCFS2_ORPHAN_NAMELEN, lookup);
1921 if (ret < 0) {
1922 mlog_errno(ret);
1923 return ret;
1924 }
1925
1926 return 0;
1927 }
1928
1929 /**
1930 * ocfs2_prepare_orphan_dir() - Prepare an orphan directory for
1931 * insertion of an orphan.
1932 * @osb: ocfs2 file system
1933 * @ret_orphan_dir: Orphan dir inode - returned locked!
1934 * @blkno: Actual block number of the inode to be inserted into orphan dir.
1935 * @lookup: dir lookup result, to be passed back into functions like
1936 * ocfs2_orphan_add
1937 *
1938 * Returns zero on success and the ret_orphan_dir, name and lookup
1939 * fields will be populated.
1940 *
1941 * Returns non-zero on failure.
1942 */
1943 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
1944 struct inode **ret_orphan_dir,
1945 u64 blkno,
1946 char *name,
1947 struct ocfs2_dir_lookup_result *lookup)
1948 {
1949 struct inode *orphan_dir_inode = NULL;
1950 struct buffer_head *orphan_dir_bh = NULL;
1951 int ret = 0;
1952
1953 ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode,
1954 &orphan_dir_bh);
1955 if (ret < 0) {
1956 mlog_errno(ret);
1957 return ret;
1958 }
1959
1960 ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh,
1961 blkno, name, lookup);
1962 if (ret < 0) {
1963 mlog_errno(ret);
1964 goto out;
1965 }
1966
1967 *ret_orphan_dir = orphan_dir_inode;
1968
1969 out:
1970 brelse(orphan_dir_bh);
1971
1972 if (ret) {
1973 ocfs2_inode_unlock(orphan_dir_inode, 1);
1974 mutex_unlock(&orphan_dir_inode->i_mutex);
1975 iput(orphan_dir_inode);
1976 }
1977
1978 if (ret)
1979 mlog_errno(ret);
1980 return ret;
1981 }
1982
1983 static int ocfs2_orphan_add(struct ocfs2_super *osb,
1984 handle_t *handle,
1985 struct inode *inode,
1986 struct buffer_head *fe_bh,
1987 char *name,
1988 struct ocfs2_dir_lookup_result *lookup,
1989 struct inode *orphan_dir_inode)
1990 {
1991 struct buffer_head *orphan_dir_bh = NULL;
1992 int status = 0;
1993 struct ocfs2_dinode *orphan_fe;
1994 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1995
1996 trace_ocfs2_orphan_add_begin(
1997 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1998
1999 status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
2000 if (status < 0) {
2001 mlog_errno(status);
2002 goto leave;
2003 }
2004
2005 status = ocfs2_journal_access_di(handle,
2006 INODE_CACHE(orphan_dir_inode),
2007 orphan_dir_bh,
2008 OCFS2_JOURNAL_ACCESS_WRITE);
2009 if (status < 0) {
2010 mlog_errno(status);
2011 goto leave;
2012 }
2013
2014 /* we're a cluster, and nlink can change on disk from
2015 * underneath us... */
2016 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2017 if (S_ISDIR(inode->i_mode))
2018 ocfs2_add_links_count(orphan_fe, 1);
2019 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2020 ocfs2_journal_dirty(handle, orphan_dir_bh);
2021
2022 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2023 OCFS2_ORPHAN_NAMELEN, inode,
2024 OCFS2_I(inode)->ip_blkno,
2025 orphan_dir_bh, lookup);
2026 if (status < 0) {
2027 mlog_errno(status);
2028 goto leave;
2029 }
2030
2031 /*
2032 * We're going to journal the change of i_flags and i_orphaned_slot.
2033 * It's safe anyway, though some callers may duplicate the journaling.
2034 * Journaling within the func just make the logic look more
2035 * straightforward.
2036 */
2037 status = ocfs2_journal_access_di(handle,
2038 INODE_CACHE(inode),
2039 fe_bh,
2040 OCFS2_JOURNAL_ACCESS_WRITE);
2041 if (status < 0) {
2042 mlog_errno(status);
2043 goto leave;
2044 }
2045
2046 le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2047 OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR;
2048
2049 /* Record which orphan dir our inode now resides
2050 * in. delete_inode will use this to determine which orphan
2051 * dir to lock. */
2052 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
2053
2054 ocfs2_journal_dirty(handle, fe_bh);
2055
2056 trace_ocfs2_orphan_add_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
2057 osb->slot_num);
2058
2059 leave:
2060 brelse(orphan_dir_bh);
2061
2062 if (status)
2063 mlog_errno(status);
2064 return status;
2065 }
2066
2067 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2068 int ocfs2_orphan_del(struct ocfs2_super *osb,
2069 handle_t *handle,
2070 struct inode *orphan_dir_inode,
2071 struct inode *inode,
2072 struct buffer_head *orphan_dir_bh)
2073 {
2074 char name[OCFS2_ORPHAN_NAMELEN + 1];
2075 struct ocfs2_dinode *orphan_fe;
2076 int status = 0;
2077 struct ocfs2_dir_lookup_result lookup = { NULL, };
2078
2079 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2080 if (status < 0) {
2081 mlog_errno(status);
2082 goto leave;
2083 }
2084
2085 trace_ocfs2_orphan_del(
2086 (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2087 name, OCFS2_ORPHAN_NAMELEN);
2088
2089 /* find it's spot in the orphan directory */
2090 status = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, orphan_dir_inode,
2091 &lookup);
2092 if (status) {
2093 mlog_errno(status);
2094 goto leave;
2095 }
2096
2097 /* remove it from the orphan directory */
2098 status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup);
2099 if (status < 0) {
2100 mlog_errno(status);
2101 goto leave;
2102 }
2103
2104 status = ocfs2_journal_access_di(handle,
2105 INODE_CACHE(orphan_dir_inode),
2106 orphan_dir_bh,
2107 OCFS2_JOURNAL_ACCESS_WRITE);
2108 if (status < 0) {
2109 mlog_errno(status);
2110 goto leave;
2111 }
2112
2113 /* do the i_nlink dance! :) */
2114 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2115 if (S_ISDIR(inode->i_mode))
2116 ocfs2_add_links_count(orphan_fe, -1);
2117 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2118 ocfs2_journal_dirty(handle, orphan_dir_bh);
2119
2120 leave:
2121 ocfs2_free_dir_lookup_result(&lookup);
2122
2123 if (status)
2124 mlog_errno(status);
2125 return status;
2126 }
2127
2128 /**
2129 * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to receive a newly
2130 * allocated file. This is different from the typical 'add to orphan dir'
2131 * operation in that the inode does not yet exist. This is a problem because
2132 * the orphan dir stringifies the inode block number to come up with it's
2133 * dirent. Obviously if the inode does not yet exist we have a chicken and egg
2134 * problem. This function works around it by calling deeper into the orphan
2135 * and suballoc code than other callers. Use this only by necessity.
2136 * @dir: The directory which this inode will ultimately wind up under - not the
2137 * orphan dir!
2138 * @dir_bh: buffer_head the @dir inode block
2139 * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled
2140 * with the string to be used for orphan dirent. Pass back to the orphan dir
2141 * code.
2142 * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan
2143 * dir code.
2144 * @ret_di_blkno: block number where the new inode will be allocated.
2145 * @orphan_insert: Dir insert context to be passed back into orphan dir code.
2146 * @ret_inode_ac: Inode alloc context to be passed back to the allocator.
2147 *
2148 * Returns zero on success and the ret_orphan_dir, name and lookup
2149 * fields will be populated.
2150 *
2151 * Returns non-zero on failure.
2152 */
2153 static int ocfs2_prep_new_orphaned_file(struct inode *dir,
2154 struct buffer_head *dir_bh,
2155 char *orphan_name,
2156 struct inode **ret_orphan_dir,
2157 u64 *ret_di_blkno,
2158 struct ocfs2_dir_lookup_result *orphan_insert,
2159 struct ocfs2_alloc_context **ret_inode_ac)
2160 {
2161 int ret;
2162 u64 di_blkno;
2163 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2164 struct inode *orphan_dir = NULL;
2165 struct buffer_head *orphan_dir_bh = NULL;
2166 struct ocfs2_alloc_context *inode_ac = NULL;
2167
2168 ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh);
2169 if (ret < 0) {
2170 mlog_errno(ret);
2171 return ret;
2172 }
2173
2174 /* reserve an inode spot */
2175 ret = ocfs2_reserve_new_inode(osb, &inode_ac);
2176 if (ret < 0) {
2177 if (ret != -ENOSPC)
2178 mlog_errno(ret);
2179 goto out;
2180 }
2181
2182 ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
2183 &di_blkno);
2184 if (ret) {
2185 mlog_errno(ret);
2186 goto out;
2187 }
2188
2189 ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
2190 di_blkno, orphan_name, orphan_insert);
2191 if (ret < 0) {
2192 mlog_errno(ret);
2193 goto out;
2194 }
2195
2196 out:
2197 if (ret == 0) {
2198 *ret_orphan_dir = orphan_dir;
2199 *ret_di_blkno = di_blkno;
2200 *ret_inode_ac = inode_ac;
2201 /*
2202 * orphan_name and orphan_insert are already up to
2203 * date via prepare_orphan_dir
2204 */
2205 } else {
2206 /* Unroll reserve_new_inode* */
2207 if (inode_ac)
2208 ocfs2_free_alloc_context(inode_ac);
2209
2210 /* Unroll orphan dir locking */
2211 mutex_unlock(&orphan_dir->i_mutex);
2212 ocfs2_inode_unlock(orphan_dir, 1);
2213 iput(orphan_dir);
2214 }
2215
2216 brelse(orphan_dir_bh);
2217
2218 return 0;
2219 }
2220
2221 int ocfs2_create_inode_in_orphan(struct inode *dir,
2222 int mode,
2223 struct inode **new_inode)
2224 {
2225 int status, did_quota_inode = 0;
2226 struct inode *inode = NULL;
2227 struct inode *orphan_dir = NULL;
2228 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2229 struct ocfs2_dinode *di = NULL;
2230 handle_t *handle = NULL;
2231 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
2232 struct buffer_head *parent_di_bh = NULL;
2233 struct buffer_head *new_di_bh = NULL;
2234 struct ocfs2_alloc_context *inode_ac = NULL;
2235 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2236 u64 uninitialized_var(di_blkno), suballoc_loc;
2237 u16 suballoc_bit;
2238
2239 status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2240 if (status < 0) {
2241 if (status != -ENOENT)
2242 mlog_errno(status);
2243 return status;
2244 }
2245
2246 status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
2247 orphan_name, &orphan_dir,
2248 &di_blkno, &orphan_insert, &inode_ac);
2249 if (status < 0) {
2250 if (status != -ENOSPC)
2251 mlog_errno(status);
2252 goto leave;
2253 }
2254
2255 inode = ocfs2_get_init_inode(dir, mode);
2256 if (!inode) {
2257 status = -ENOMEM;
2258 mlog_errno(status);
2259 goto leave;
2260 }
2261
2262 handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
2263 if (IS_ERR(handle)) {
2264 status = PTR_ERR(handle);
2265 handle = NULL;
2266 mlog_errno(status);
2267 goto leave;
2268 }
2269
2270 status = dquot_alloc_inode(inode);
2271 if (status)
2272 goto leave;
2273 did_quota_inode = 1;
2274
2275 status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
2276 &suballoc_loc,
2277 &suballoc_bit, di_blkno);
2278 if (status < 0) {
2279 mlog_errno(status);
2280 goto leave;
2281 }
2282
2283 clear_nlink(inode);
2284 /* do the real work now. */
2285 status = __ocfs2_mknod_locked(dir, inode,
2286 0, &new_di_bh, parent_di_bh, handle,
2287 inode_ac, di_blkno, suballoc_loc,
2288 suballoc_bit);
2289 if (status < 0) {
2290 mlog_errno(status);
2291 goto leave;
2292 }
2293
2294 di = (struct ocfs2_dinode *)new_di_bh->b_data;
2295 status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
2296 &orphan_insert, orphan_dir);
2297 if (status < 0) {
2298 mlog_errno(status);
2299 goto leave;
2300 }
2301
2302 /* get open lock so that only nodes can't remove it from orphan dir. */
2303 status = ocfs2_open_lock(inode);
2304 if (status < 0)
2305 mlog_errno(status);
2306
2307 insert_inode_hash(inode);
2308 leave:
2309 if (status < 0 && did_quota_inode)
2310 dquot_free_inode(inode);
2311 if (handle)
2312 ocfs2_commit_trans(osb, handle);
2313
2314 if (orphan_dir) {
2315 /* This was locked for us in ocfs2_prepare_orphan_dir() */
2316 ocfs2_inode_unlock(orphan_dir, 1);
2317 mutex_unlock(&orphan_dir->i_mutex);
2318 iput(orphan_dir);
2319 }
2320
2321 if ((status < 0) && inode) {
2322 clear_nlink(inode);
2323 iput(inode);
2324 }
2325
2326 if (inode_ac)
2327 ocfs2_free_alloc_context(inode_ac);
2328
2329 brelse(new_di_bh);
2330
2331 if (!status)
2332 *new_inode = inode;
2333
2334 ocfs2_free_dir_lookup_result(&orphan_insert);
2335
2336 ocfs2_inode_unlock(dir, 1);
2337 brelse(parent_di_bh);
2338 return status;
2339 }
2340
2341 int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
2342 struct inode *inode,
2343 struct dentry *dentry)
2344 {
2345 int status = 0;
2346 struct buffer_head *parent_di_bh = NULL;
2347 handle_t *handle = NULL;
2348 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2349 struct ocfs2_dinode *dir_di, *di;
2350 struct inode *orphan_dir_inode = NULL;
2351 struct buffer_head *orphan_dir_bh = NULL;
2352 struct buffer_head *di_bh = NULL;
2353 struct ocfs2_dir_lookup_result lookup = { NULL, };
2354
2355 trace_ocfs2_mv_orphaned_inode_to_new(dir, dentry,
2356 dentry->d_name.len, dentry->d_name.name,
2357 (unsigned long long)OCFS2_I(dir)->ip_blkno,
2358 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2359
2360 status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2361 if (status < 0) {
2362 if (status != -ENOENT)
2363 mlog_errno(status);
2364 return status;
2365 }
2366
2367 dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
2368 if (!dir_di->i_links_count) {
2369 /* can't make a file in a deleted directory. */
2370 status = -ENOENT;
2371 goto leave;
2372 }
2373
2374 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
2375 dentry->d_name.len);
2376 if (status)
2377 goto leave;
2378
2379 /* get a spot inside the dir. */
2380 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_di_bh,
2381 dentry->d_name.name,
2382 dentry->d_name.len, &lookup);
2383 if (status < 0) {
2384 mlog_errno(status);
2385 goto leave;
2386 }
2387
2388 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2389 ORPHAN_DIR_SYSTEM_INODE,
2390 osb->slot_num);
2391 if (!orphan_dir_inode) {
2392 status = -EEXIST;
2393 mlog_errno(status);
2394 goto leave;
2395 }
2396
2397 mutex_lock(&orphan_dir_inode->i_mutex);
2398
2399 status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2400 if (status < 0) {
2401 mlog_errno(status);
2402 mutex_unlock(&orphan_dir_inode->i_mutex);
2403 iput(orphan_dir_inode);
2404 goto leave;
2405 }
2406
2407 status = ocfs2_read_inode_block(inode, &di_bh);
2408 if (status < 0) {
2409 mlog_errno(status);
2410 goto orphan_unlock;
2411 }
2412
2413 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
2414 if (IS_ERR(handle)) {
2415 status = PTR_ERR(handle);
2416 handle = NULL;
2417 mlog_errno(status);
2418 goto orphan_unlock;
2419 }
2420
2421 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
2422 di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2423 if (status < 0) {
2424 mlog_errno(status);
2425 goto out_commit;
2426 }
2427
2428 status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
2429 orphan_dir_bh);
2430 if (status < 0) {
2431 mlog_errno(status);
2432 goto out_commit;
2433 }
2434
2435 di = (struct ocfs2_dinode *)di_bh->b_data;
2436 le32_add_cpu(&di->i_flags, -OCFS2_ORPHANED_FL);
2437 di->i_orphaned_slot = 0;
2438 set_nlink(inode, 1);
2439 ocfs2_set_links_count(di, inode->i_nlink);
2440 ocfs2_journal_dirty(handle, di_bh);
2441
2442 status = ocfs2_add_entry(handle, dentry, inode,
2443 OCFS2_I(inode)->ip_blkno, parent_di_bh,
2444 &lookup);
2445 if (status < 0) {
2446 mlog_errno(status);
2447 goto out_commit;
2448 }
2449
2450 status = ocfs2_dentry_attach_lock(dentry, inode,
2451 OCFS2_I(dir)->ip_blkno);
2452 if (status) {
2453 mlog_errno(status);
2454 goto out_commit;
2455 }
2456
2457 d_instantiate(dentry, inode);
2458 status = 0;
2459 out_commit:
2460 ocfs2_commit_trans(osb, handle);
2461 orphan_unlock:
2462 ocfs2_inode_unlock(orphan_dir_inode, 1);
2463 mutex_unlock(&orphan_dir_inode->i_mutex);
2464 iput(orphan_dir_inode);
2465 leave:
2466
2467 ocfs2_inode_unlock(dir, 1);
2468
2469 brelse(di_bh);
2470 brelse(parent_di_bh);
2471 brelse(orphan_dir_bh);
2472
2473 ocfs2_free_dir_lookup_result(&lookup);
2474
2475 if (status)
2476 mlog_errno(status);
2477
2478 return status;
2479 }
2480
2481 const struct inode_operations ocfs2_dir_iops = {
2482 .create = ocfs2_create,
2483 .lookup = ocfs2_lookup,
2484 .link = ocfs2_link,
2485 .unlink = ocfs2_unlink,
2486 .rmdir = ocfs2_unlink,
2487 .symlink = ocfs2_symlink,
2488 .mkdir = ocfs2_mkdir,
2489 .mknod = ocfs2_mknod,
2490 .rename = ocfs2_rename,
2491 .setattr = ocfs2_setattr,
2492 .getattr = ocfs2_getattr,
2493 .permission = ocfs2_permission,
2494 .setxattr = generic_setxattr,
2495 .getxattr = generic_getxattr,
2496 .listxattr = ocfs2_listxattr,
2497 .removexattr = generic_removexattr,
2498 .fiemap = ocfs2_fiemap,
2499 .get_acl = ocfs2_iop_get_acl,
2500 };
Linux 2.6 libata-dev (mirror)