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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / fs / ocfs2 / namei.c
blob4f791f6d27d0463f8bef77dc20a5f5274df8ddea
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 unsigned int flags)
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 = -ENOMEM;
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(i_uid_read(inode));
516 fe->i_gid = cpu_to_le32(i_gid_read(inode));
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 fe->i_flags |= cpu_to_le32(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 bool excl)
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 ocfs2_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 bool is_unlinkable = false;
795 struct inode *inode = dentry->d_inode;
796 struct inode *orphan_dir = NULL;
797 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
798 u64 blkno;
799 struct ocfs2_dinode *fe = NULL;
800 struct buffer_head *fe_bh = NULL;
801 struct buffer_head *parent_node_bh = NULL;
802 handle_t *handle = NULL;
803 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
804 struct ocfs2_dir_lookup_result lookup = { NULL, };
805 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
806
807 trace_ocfs2_unlink(dir, dentry, dentry->d_name.len,
808 dentry->d_name.name,
809 (unsigned long long)OCFS2_I(dir)->ip_blkno,
810 (unsigned long long)OCFS2_I(inode)->ip_blkno);
811
812 dquot_initialize(dir);
813
814 BUG_ON(dentry->d_parent->d_inode != dir);
815
816 if (inode == osb->root_inode)
817 return -EPERM;
818
819 status = ocfs2_inode_lock_nested(dir, &parent_node_bh, 1,
820 OI_LS_PARENT);
821 if (status < 0) {
822 if (status != -ENOENT)
823 mlog_errno(status);
824 return status;
825 }
826
827 status = ocfs2_find_files_on_disk(dentry->d_name.name,
828 dentry->d_name.len, &blkno, dir,
829 &lookup);
830 if (status < 0) {
831 if (status != -ENOENT)
832 mlog_errno(status);
833 goto leave;
834 }
835
836 if (OCFS2_I(inode)->ip_blkno != blkno) {
837 status = -ENOENT;
838
839 trace_ocfs2_unlink_noent(
840 (unsigned long long)OCFS2_I(inode)->ip_blkno,
841 (unsigned long long)blkno,
842 OCFS2_I(inode)->ip_flags);
843 goto leave;
844 }
845
846 status = ocfs2_inode_lock(inode, &fe_bh, 1);
847 if (status < 0) {
848 if (status != -ENOENT)
849 mlog_errno(status);
850 goto leave;
851 }
852 child_locked = 1;
853
854 if (S_ISDIR(inode->i_mode)) {
855 if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
856 status = -ENOTEMPTY;
857 goto leave;
858 }
859 }
860
861 status = ocfs2_remote_dentry_delete(dentry);
862 if (status < 0) {
863 /* This remote delete should succeed under all normal
864 * circumstances. */
865 mlog_errno(status);
866 goto leave;
867 }
868
869 if (ocfs2_inode_is_unlinkable(inode)) {
870 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
871 OCFS2_I(inode)->ip_blkno,
872 orphan_name, &orphan_insert);
873 if (status < 0) {
874 mlog_errno(status);
875 goto leave;
876 }
877 is_unlinkable = true;
878 }
879
880 handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb));
881 if (IS_ERR(handle)) {
882 status = PTR_ERR(handle);
883 handle = NULL;
884 mlog_errno(status);
885 goto leave;
886 }
887
888 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
889 OCFS2_JOURNAL_ACCESS_WRITE);
890 if (status < 0) {
891 mlog_errno(status);
892 goto leave;
893 }
894
895 fe = (struct ocfs2_dinode *) fe_bh->b_data;
896
897 /* delete the name from the parent dir */
898 status = ocfs2_delete_entry(handle, dir, &lookup);
899 if (status < 0) {
900 mlog_errno(status);
901 goto leave;
902 }
903
904 if (S_ISDIR(inode->i_mode))
905 drop_nlink(inode);
906 drop_nlink(inode);
907 ocfs2_set_links_count(fe, inode->i_nlink);
908 ocfs2_journal_dirty(handle, fe_bh);
909
910 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
911 if (S_ISDIR(inode->i_mode))
912 drop_nlink(dir);
913
914 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
915 if (status < 0) {
916 mlog_errno(status);
917 if (S_ISDIR(inode->i_mode))
918 inc_nlink(dir);
919 goto leave;
920 }
921
922 if (is_unlinkable) {
923 status = ocfs2_orphan_add(osb, handle, inode, fe_bh,
924 orphan_name, &orphan_insert, orphan_dir);
925 if (status < 0)
926 mlog_errno(status);
927 }
928
929 leave:
930 if (handle)
931 ocfs2_commit_trans(osb, handle);
932
933 if (child_locked)
934 ocfs2_inode_unlock(inode, 1);
935
936 ocfs2_inode_unlock(dir, 1);
937
938 if (orphan_dir) {
939 /* This was locked for us in ocfs2_prepare_orphan_dir() */
940 ocfs2_inode_unlock(orphan_dir, 1);
941 mutex_unlock(&orphan_dir->i_mutex);
942 iput(orphan_dir);
943 }
944
945 brelse(fe_bh);
946 brelse(parent_node_bh);
947
948 ocfs2_free_dir_lookup_result(&orphan_insert);
949 ocfs2_free_dir_lookup_result(&lookup);
950
951 if (status && (status != -ENOTEMPTY))
952 mlog_errno(status);
953
954 return status;
955 }
956
957 /*
958 * The only place this should be used is rename!
959 * if they have the same id, then the 1st one is the only one locked.
960 */
961 static int ocfs2_double_lock(struct ocfs2_super *osb,
962 struct buffer_head **bh1,
963 struct inode *inode1,
964 struct buffer_head **bh2,
965 struct inode *inode2)
966 {
967 int status;
968 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
969 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
970 struct buffer_head **tmpbh;
971 struct inode *tmpinode;
972
973 trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno,
974 (unsigned long long)oi2->ip_blkno);
975
976 if (*bh1)
977 *bh1 = NULL;
978 if (*bh2)
979 *bh2 = NULL;
980
981 /* we always want to lock the one with the lower lockid first. */
982 if (oi1->ip_blkno != oi2->ip_blkno) {
983 if (oi1->ip_blkno < oi2->ip_blkno) {
984 /* switch id1 and id2 around */
985 tmpbh = bh2;
986 bh2 = bh1;
987 bh1 = tmpbh;
988
989 tmpinode = inode2;
990 inode2 = inode1;
991 inode1 = tmpinode;
992 }
993 /* lock id2 */
994 status = ocfs2_inode_lock_nested(inode2, bh2, 1,
995 OI_LS_RENAME1);
996 if (status < 0) {
997 if (status != -ENOENT)
998 mlog_errno(status);
999 goto bail;
1000 }
1001 }
1002
1003 /* lock id1 */
1004 status = ocfs2_inode_lock_nested(inode1, bh1, 1, OI_LS_RENAME2);
1005 if (status < 0) {
1006 /*
1007 * An error return must mean that no cluster locks
1008 * were held on function exit.
1009 */
1010 if (oi1->ip_blkno != oi2->ip_blkno) {
1011 ocfs2_inode_unlock(inode2, 1);
1012 brelse(*bh2);
1013 *bh2 = NULL;
1014 }
1015
1016 if (status != -ENOENT)
1017 mlog_errno(status);
1018 }
1019
1020 trace_ocfs2_double_lock_end(
1021 (unsigned long long)OCFS2_I(inode1)->ip_blkno,
1022 (unsigned long long)OCFS2_I(inode2)->ip_blkno);
1023
1024 bail:
1025 if (status)
1026 mlog_errno(status);
1027 return status;
1028 }
1029
1030 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1031 {
1032 ocfs2_inode_unlock(inode1, 1);
1033
1034 if (inode1 != inode2)
1035 ocfs2_inode_unlock(inode2, 1);
1036 }
1037
1038 static int ocfs2_rename(struct inode *old_dir,
1039 struct dentry *old_dentry,
1040 struct inode *new_dir,
1041 struct dentry *new_dentry)
1042 {
1043 int status = 0, rename_lock = 0, parents_locked = 0, target_exists = 0;
1044 int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 0;
1045 struct inode *old_inode = old_dentry->d_inode;
1046 struct inode *new_inode = new_dentry->d_inode;
1047 struct inode *orphan_dir = NULL;
1048 struct ocfs2_dinode *newfe = NULL;
1049 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1050 struct buffer_head *newfe_bh = NULL;
1051 struct buffer_head *old_inode_bh = NULL;
1052 struct ocfs2_super *osb = NULL;
1053 u64 newfe_blkno, old_de_ino;
1054 handle_t *handle = NULL;
1055 struct buffer_head *old_dir_bh = NULL;
1056 struct buffer_head *new_dir_bh = NULL;
1057 u32 old_dir_nlink = old_dir->i_nlink;
1058 struct ocfs2_dinode *old_di;
1059 struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
1060 struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
1061 struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
1062 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
1063 struct ocfs2_dir_lookup_result target_insert = { NULL, };
1064
1065 /* At some point it might be nice to break this function up a
1066 * bit. */
1067
1068 trace_ocfs2_rename(old_dir, old_dentry, new_dir, new_dentry,
1069 old_dentry->d_name.len, old_dentry->d_name.name,
1070 new_dentry->d_name.len, new_dentry->d_name.name);
1071
1072 dquot_initialize(old_dir);
1073 dquot_initialize(new_dir);
1074
1075 osb = OCFS2_SB(old_dir->i_sb);
1076
1077 if (new_inode) {
1078 if (!igrab(new_inode))
1079 BUG();
1080 }
1081
1082 /* Assume a directory hierarchy thusly:
1083 * a/b/c
1084 * a/d
1085 * a,b,c, and d are all directories.
1086 *
1087 * from cwd of 'a' on both nodes:
1088 * node1: mv b/c d
1089 * node2: mv d b/c
1090 *
1091 * And that's why, just like the VFS, we need a file system
1092 * rename lock. */
1093 if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
1094 status = ocfs2_rename_lock(osb);
1095 if (status < 0) {
1096 mlog_errno(status);
1097 goto bail;
1098 }
1099 rename_lock = 1;
1100 }
1101
1102 /* if old and new are the same, this'll just do one lock. */
1103 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1104 &new_dir_bh, new_dir);
1105 if (status < 0) {
1106 mlog_errno(status);
1107 goto bail;
1108 }
1109 parents_locked = 1;
1110
1111 /* make sure both dirs have bhs
1112 * get an extra ref on old_dir_bh if old==new */
1113 if (!new_dir_bh) {
1114 if (old_dir_bh) {
1115 new_dir_bh = old_dir_bh;
1116 get_bh(new_dir_bh);
1117 } else {
1118 mlog(ML_ERROR, "no old_dir_bh!\n");
1119 status = -EIO;
1120 goto bail;
1121 }
1122 }
1123
1124 /*
1125 * Aside from allowing a meta data update, the locking here
1126 * also ensures that the downconvert thread on other nodes
1127 * won't have to concurrently downconvert the inode and the
1128 * dentry locks.
1129 */
1130 status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
1131 OI_LS_PARENT);
1132 if (status < 0) {
1133 if (status != -ENOENT)
1134 mlog_errno(status);
1135 goto bail;
1136 }
1137 old_child_locked = 1;
1138
1139 status = ocfs2_remote_dentry_delete(old_dentry);
1140 if (status < 0) {
1141 mlog_errno(status);
1142 goto bail;
1143 }
1144
1145 if (S_ISDIR(old_inode->i_mode)) {
1146 u64 old_inode_parent;
1147
1148 update_dot_dot = 1;
1149 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1150 old_inode,
1151 &old_inode_dot_dot_res);
1152 if (status) {
1153 status = -EIO;
1154 goto bail;
1155 }
1156
1157 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1158 status = -EIO;
1159 goto bail;
1160 }
1161
1162 if (!new_inode && new_dir != old_dir &&
1163 new_dir->i_nlink >= ocfs2_link_max(osb)) {
1164 status = -EMLINK;
1165 goto bail;
1166 }
1167 }
1168
1169 status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1170 old_dentry->d_name.len,
1171 &old_de_ino);
1172 if (status) {
1173 status = -ENOENT;
1174 goto bail;
1175 }
1176
1177 /*
1178 * Check for inode number is _not_ due to possible IO errors.
1179 * We might rmdir the source, keep it as pwd of some process
1180 * and merrily kill the link to whatever was created under the
1181 * same name. Goodbye sticky bit ;-<
1182 */
1183 if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1184 status = -ENOENT;
1185 goto bail;
1186 }
1187
1188 /* check if the target already exists (in which case we need
1189 * to delete it */
1190 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1191 new_dentry->d_name.len,
1192 &newfe_blkno, new_dir,
1193 &target_lookup_res);
1194 /* The only error we allow here is -ENOENT because the new
1195 * file not existing is perfectly valid. */
1196 if ((status < 0) && (status != -ENOENT)) {
1197 /* If we cannot find the file specified we should just */
1198 /* return the error... */
1199 mlog_errno(status);
1200 goto bail;
1201 }
1202 if (status == 0)
1203 target_exists = 1;
1204
1205 if (!target_exists && new_inode) {
1206 /*
1207 * Target was unlinked by another node while we were
1208 * waiting to get to ocfs2_rename(). There isn't
1209 * anything we can do here to help the situation, so
1210 * bubble up the appropriate error.
1211 */
1212 status = -ENOENT;
1213 goto bail;
1214 }
1215
1216 /* In case we need to overwrite an existing file, we blow it
1217 * away first */
1218 if (target_exists) {
1219 /* VFS didn't think there existed an inode here, but
1220 * someone else in the cluster must have raced our
1221 * rename to create one. Today we error cleanly, in
1222 * the future we should consider calling iget to build
1223 * a new struct inode for this entry. */
1224 if (!new_inode) {
1225 status = -EACCES;
1226
1227 trace_ocfs2_rename_target_exists(new_dentry->d_name.len,
1228 new_dentry->d_name.name);
1229 goto bail;
1230 }
1231
1232 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1233 status = -EACCES;
1234
1235 trace_ocfs2_rename_disagree(
1236 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1237 (unsigned long long)newfe_blkno,
1238 OCFS2_I(new_inode)->ip_flags);
1239 goto bail;
1240 }
1241
1242 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1243 if (status < 0) {
1244 if (status != -ENOENT)
1245 mlog_errno(status);
1246 goto bail;
1247 }
1248 new_child_locked = 1;
1249
1250 status = ocfs2_remote_dentry_delete(new_dentry);
1251 if (status < 0) {
1252 mlog_errno(status);
1253 goto bail;
1254 }
1255
1256 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1257
1258 trace_ocfs2_rename_over_existing(
1259 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1260 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1261
1262 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1263 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1264 OCFS2_I(new_inode)->ip_blkno,
1265 orphan_name, &orphan_insert);
1266 if (status < 0) {
1267 mlog_errno(status);
1268 goto bail;
1269 }
1270 }
1271 } else {
1272 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1273
1274 status = ocfs2_check_dir_for_entry(new_dir,
1275 new_dentry->d_name.name,
1276 new_dentry->d_name.len);
1277 if (status)
1278 goto bail;
1279
1280 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1281 new_dentry->d_name.name,
1282 new_dentry->d_name.len,
1283 &target_insert);
1284 if (status < 0) {
1285 mlog_errno(status);
1286 goto bail;
1287 }
1288 }
1289
1290 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
1291 if (IS_ERR(handle)) {
1292 status = PTR_ERR(handle);
1293 handle = NULL;
1294 mlog_errno(status);
1295 goto bail;
1296 }
1297
1298 if (target_exists) {
1299 if (S_ISDIR(new_inode->i_mode)) {
1300 if (new_inode->i_nlink != 2 ||
1301 !ocfs2_empty_dir(new_inode)) {
1302 status = -ENOTEMPTY;
1303 goto bail;
1304 }
1305 }
1306 status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
1307 newfe_bh,
1308 OCFS2_JOURNAL_ACCESS_WRITE);
1309 if (status < 0) {
1310 mlog_errno(status);
1311 goto bail;
1312 }
1313
1314 if (S_ISDIR(new_inode->i_mode) ||
1315 (ocfs2_read_links_count(newfe) == 1)) {
1316 status = ocfs2_orphan_add(osb, handle, new_inode,
1317 newfe_bh, orphan_name,
1318 &orphan_insert, orphan_dir);
1319 if (status < 0) {
1320 mlog_errno(status);
1321 goto bail;
1322 }
1323 }
1324
1325 /* change the dirent to point to the correct inode */
1326 status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
1327 old_inode);
1328 if (status < 0) {
1329 mlog_errno(status);
1330 goto bail;
1331 }
1332 new_dir->i_version++;
1333
1334 if (S_ISDIR(new_inode->i_mode))
1335 ocfs2_set_links_count(newfe, 0);
1336 else
1337 ocfs2_add_links_count(newfe, -1);
1338 ocfs2_journal_dirty(handle, newfe_bh);
1339 } else {
1340 /* if the name was not found in new_dir, add it now */
1341 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1342 OCFS2_I(old_inode)->ip_blkno,
1343 new_dir_bh, &target_insert);
1344 }
1345
1346 old_inode->i_ctime = CURRENT_TIME;
1347 mark_inode_dirty(old_inode);
1348
1349 status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode),
1350 old_inode_bh,
1351 OCFS2_JOURNAL_ACCESS_WRITE);
1352 if (status >= 0) {
1353 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1354
1355 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1356 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1357 ocfs2_journal_dirty(handle, old_inode_bh);
1358 } else
1359 mlog_errno(status);
1360
1361 /*
1362 * Now that the name has been added to new_dir, remove the old name.
1363 *
1364 * We don't keep any directory entry context around until now
1365 * because the insert might have changed the type of directory
1366 * we're dealing with.
1367 */
1368 status = ocfs2_find_entry(old_dentry->d_name.name,
1369 old_dentry->d_name.len, old_dir,
1370 &old_entry_lookup);
1371 if (status)
1372 goto bail;
1373
1374 status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
1375 if (status < 0) {
1376 mlog_errno(status);
1377 goto bail;
1378 }
1379
1380 if (new_inode) {
1381 drop_nlink(new_inode);
1382 new_inode->i_ctime = CURRENT_TIME;
1383 }
1384 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1385
1386 if (update_dot_dot) {
1387 status = ocfs2_update_entry(old_inode, handle,
1388 &old_inode_dot_dot_res, new_dir);
1389 drop_nlink(old_dir);
1390 if (new_inode) {
1391 drop_nlink(new_inode);
1392 } else {
1393 inc_nlink(new_dir);
1394 mark_inode_dirty(new_dir);
1395 }
1396 }
1397 mark_inode_dirty(old_dir);
1398 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1399 if (new_inode) {
1400 mark_inode_dirty(new_inode);
1401 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1402 }
1403
1404 if (old_dir != new_dir) {
1405 /* Keep the same times on both directories.*/
1406 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1407
1408 /*
1409 * This will also pick up the i_nlink change from the
1410 * block above.
1411 */
1412 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1413 }
1414
1415 if (old_dir_nlink != old_dir->i_nlink) {
1416 if (!old_dir_bh) {
1417 mlog(ML_ERROR, "need to change nlink for old dir "
1418 "%llu from %d to %d but bh is NULL!\n",
1419 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1420 (int)old_dir_nlink, old_dir->i_nlink);
1421 } else {
1422 struct ocfs2_dinode *fe;
1423 status = ocfs2_journal_access_di(handle,
1424 INODE_CACHE(old_dir),
1425 old_dir_bh,
1426 OCFS2_JOURNAL_ACCESS_WRITE);
1427 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1428 ocfs2_set_links_count(fe, old_dir->i_nlink);
1429 ocfs2_journal_dirty(handle, old_dir_bh);
1430 }
1431 }
1432 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1433 status = 0;
1434 bail:
1435 if (rename_lock)
1436 ocfs2_rename_unlock(osb);
1437
1438 if (handle)
1439 ocfs2_commit_trans(osb, handle);
1440
1441 if (parents_locked)
1442 ocfs2_double_unlock(old_dir, new_dir);
1443
1444 if (old_child_locked)
1445 ocfs2_inode_unlock(old_inode, 1);
1446
1447 if (new_child_locked)
1448 ocfs2_inode_unlock(new_inode, 1);
1449
1450 if (orphan_dir) {
1451 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1452 ocfs2_inode_unlock(orphan_dir, 1);
1453 mutex_unlock(&orphan_dir->i_mutex);
1454 iput(orphan_dir);
1455 }
1456
1457 if (new_inode)
1458 sync_mapping_buffers(old_inode->i_mapping);
1459
1460 if (new_inode)
1461 iput(new_inode);
1462
1463 ocfs2_free_dir_lookup_result(&target_lookup_res);
1464 ocfs2_free_dir_lookup_result(&old_entry_lookup);
1465 ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
1466 ocfs2_free_dir_lookup_result(&orphan_insert);
1467 ocfs2_free_dir_lookup_result(&target_insert);
1468
1469 brelse(newfe_bh);
1470 brelse(old_inode_bh);
1471 brelse(old_dir_bh);
1472 brelse(new_dir_bh);
1473
1474 if (status)
1475 mlog_errno(status);
1476
1477 return status;
1478 }
1479
1480 /*
1481 * we expect i_size = strlen(symname). Copy symname into the file
1482 * data, including the null terminator.
1483 */
1484 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1485 handle_t *handle,
1486 struct inode *inode,
1487 const char *symname)
1488 {
1489 struct buffer_head **bhs = NULL;
1490 const char *c;
1491 struct super_block *sb = osb->sb;
1492 u64 p_blkno, p_blocks;
1493 int virtual, blocks, status, i, bytes_left;
1494
1495 bytes_left = i_size_read(inode) + 1;
1496 /* we can't trust i_blocks because we're actually going to
1497 * write i_size + 1 bytes. */
1498 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1499
1500 trace_ocfs2_create_symlink_data((unsigned long long)inode->i_blocks,
1501 i_size_read(inode), blocks);
1502
1503 /* Sanity check -- make sure we're going to fit. */
1504 if (bytes_left >
1505 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1506 status = -EIO;
1507 mlog_errno(status);
1508 goto bail;
1509 }
1510
1511 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1512 if (!bhs) {
1513 status = -ENOMEM;
1514 mlog_errno(status);
1515 goto bail;
1516 }
1517
1518 status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1519 NULL);
1520 if (status < 0) {
1521 mlog_errno(status);
1522 goto bail;
1523 }
1524
1525 /* links can never be larger than one cluster so we know this
1526 * is all going to be contiguous, but do a sanity check
1527 * anyway. */
1528 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1529 status = -EIO;
1530 mlog_errno(status);
1531 goto bail;
1532 }
1533
1534 virtual = 0;
1535 while(bytes_left > 0) {
1536 c = &symname[virtual * sb->s_blocksize];
1537
1538 bhs[virtual] = sb_getblk(sb, p_blkno);
1539 if (!bhs[virtual]) {
1540 status = -ENOMEM;
1541 mlog_errno(status);
1542 goto bail;
1543 }
1544 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode),
1545 bhs[virtual]);
1546
1547 status = ocfs2_journal_access(handle, INODE_CACHE(inode),
1548 bhs[virtual],
1549 OCFS2_JOURNAL_ACCESS_CREATE);
1550 if (status < 0) {
1551 mlog_errno(status);
1552 goto bail;
1553 }
1554
1555 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1556
1557 memcpy(bhs[virtual]->b_data, c,
1558 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1559 bytes_left);
1560
1561 ocfs2_journal_dirty(handle, bhs[virtual]);
1562
1563 virtual++;
1564 p_blkno++;
1565 bytes_left -= sb->s_blocksize;
1566 }
1567
1568 status = 0;
1569 bail:
1570
1571 if (bhs) {
1572 for(i = 0; i < blocks; i++)
1573 brelse(bhs[i]);
1574 kfree(bhs);
1575 }
1576
1577 if (status)
1578 mlog_errno(status);
1579 return status;
1580 }
1581
1582 static int ocfs2_symlink(struct inode *dir,
1583 struct dentry *dentry,
1584 const char *symname)
1585 {
1586 int status, l, credits;
1587 u64 newsize;
1588 struct ocfs2_super *osb = NULL;
1589 struct inode *inode = NULL;
1590 struct super_block *sb;
1591 struct buffer_head *new_fe_bh = NULL;
1592 struct buffer_head *parent_fe_bh = NULL;
1593 struct ocfs2_dinode *fe = NULL;
1594 struct ocfs2_dinode *dirfe;
1595 handle_t *handle = NULL;
1596 struct ocfs2_alloc_context *inode_ac = NULL;
1597 struct ocfs2_alloc_context *data_ac = NULL;
1598 struct ocfs2_alloc_context *xattr_ac = NULL;
1599 int want_clusters = 0;
1600 int xattr_credits = 0;
1601 struct ocfs2_security_xattr_info si = {
1602 .enable = 1,
1603 };
1604 int did_quota = 0, did_quota_inode = 0;
1605 struct ocfs2_dir_lookup_result lookup = { NULL, };
1606 sigset_t oldset;
1607 int did_block_signals = 0;
1608
1609 trace_ocfs2_symlink_begin(dir, dentry, symname,
1610 dentry->d_name.len, dentry->d_name.name);
1611
1612 dquot_initialize(dir);
1613
1614 sb = dir->i_sb;
1615 osb = OCFS2_SB(sb);
1616
1617 l = strlen(symname) + 1;
1618
1619 credits = ocfs2_calc_symlink_credits(sb);
1620
1621 /* lock the parent directory */
1622 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1623 if (status < 0) {
1624 if (status != -ENOENT)
1625 mlog_errno(status);
1626 return status;
1627 }
1628
1629 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1630 if (!ocfs2_read_links_count(dirfe)) {
1631 /* can't make a file in a deleted directory. */
1632 status = -ENOENT;
1633 goto bail;
1634 }
1635
1636 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1637 dentry->d_name.len);
1638 if (status)
1639 goto bail;
1640
1641 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1642 dentry->d_name.name,
1643 dentry->d_name.len, &lookup);
1644 if (status < 0) {
1645 mlog_errno(status);
1646 goto bail;
1647 }
1648
1649 status = ocfs2_reserve_new_inode(osb, &inode_ac);
1650 if (status < 0) {
1651 if (status != -ENOSPC)
1652 mlog_errno(status);
1653 goto bail;
1654 }
1655
1656 inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
1657 if (!inode) {
1658 status = -ENOMEM;
1659 mlog_errno(status);
1660 goto bail;
1661 }
1662
1663 /* get security xattr */
1664 status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
1665 if (status) {
1666 if (status == -EOPNOTSUPP)
1667 si.enable = 0;
1668 else {
1669 mlog_errno(status);
1670 goto bail;
1671 }
1672 }
1673
1674 /* calculate meta data/clusters for setting security xattr */
1675 if (si.enable) {
1676 status = ocfs2_calc_security_init(dir, &si, &want_clusters,
1677 &xattr_credits, &xattr_ac);
1678 if (status < 0) {
1679 mlog_errno(status);
1680 goto bail;
1681 }
1682 }
1683
1684 /* don't reserve bitmap space for fast symlinks. */
1685 if (l > ocfs2_fast_symlink_chars(sb))
1686 want_clusters += 1;
1687
1688 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
1689 if (status < 0) {
1690 if (status != -ENOSPC)
1691 mlog_errno(status);
1692 goto bail;
1693 }
1694
1695 handle = ocfs2_start_trans(osb, credits + xattr_credits);
1696 if (IS_ERR(handle)) {
1697 status = PTR_ERR(handle);
1698 handle = NULL;
1699 mlog_errno(status);
1700 goto bail;
1701 }
1702
1703 /* Starting to change things, restart is no longer possible. */
1704 ocfs2_block_signals(&oldset);
1705 did_block_signals = 1;
1706
1707 status = dquot_alloc_inode(inode);
1708 if (status)
1709 goto bail;
1710 did_quota_inode = 1;
1711
1712 trace_ocfs2_symlink_create(dir, dentry, dentry->d_name.len,
1713 dentry->d_name.name,
1714 (unsigned long long)OCFS2_I(dir)->ip_blkno,
1715 inode->i_mode);
1716
1717 status = ocfs2_mknod_locked(osb, dir, inode,
1718 0, &new_fe_bh, parent_fe_bh, handle,
1719 inode_ac);
1720 if (status < 0) {
1721 mlog_errno(status);
1722 goto bail;
1723 }
1724
1725 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1726 inode->i_rdev = 0;
1727 newsize = l - 1;
1728 inode->i_op = &ocfs2_symlink_inode_operations;
1729 if (l > ocfs2_fast_symlink_chars(sb)) {
1730 u32 offset = 0;
1731
1732 status = dquot_alloc_space_nodirty(inode,
1733 ocfs2_clusters_to_bytes(osb->sb, 1));
1734 if (status)
1735 goto bail;
1736 did_quota = 1;
1737 inode->i_mapping->a_ops = &ocfs2_aops;
1738 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
1739 new_fe_bh,
1740 handle, data_ac, NULL,
1741 NULL);
1742 if (status < 0) {
1743 if (status != -ENOSPC && status != -EINTR) {
1744 mlog(ML_ERROR,
1745 "Failed to extend file to %llu\n",
1746 (unsigned long long)newsize);
1747 mlog_errno(status);
1748 status = -ENOSPC;
1749 }
1750 goto bail;
1751 }
1752 i_size_write(inode, newsize);
1753 inode->i_blocks = ocfs2_inode_sector_count(inode);
1754 } else {
1755 inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
1756 memcpy((char *) fe->id2.i_symlink, symname, l);
1757 i_size_write(inode, newsize);
1758 inode->i_blocks = 0;
1759 }
1760
1761 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1762 if (status < 0) {
1763 mlog_errno(status);
1764 goto bail;
1765 }
1766
1767 if (!ocfs2_inode_is_fast_symlink(inode)) {
1768 status = ocfs2_create_symlink_data(osb, handle, inode,
1769 symname);
1770 if (status < 0) {
1771 mlog_errno(status);
1772 goto bail;
1773 }
1774 }
1775
1776 if (si.enable) {
1777 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
1778 xattr_ac, data_ac);
1779 if (status < 0) {
1780 mlog_errno(status);
1781 goto bail;
1782 }
1783 }
1784
1785 /*
1786 * Do this before adding the entry to the directory. We add
1787 * also set d_op after success so that ->d_iput() will cleanup
1788 * the dentry lock even if ocfs2_add_entry() fails below.
1789 */
1790 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1791 if (status) {
1792 mlog_errno(status);
1793 goto bail;
1794 }
1795
1796 status = ocfs2_add_entry(handle, dentry, inode,
1797 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1798 &lookup);
1799 if (status < 0) {
1800 mlog_errno(status);
1801 goto bail;
1802 }
1803
1804 insert_inode_hash(inode);
1805 d_instantiate(dentry, inode);
1806 bail:
1807 if (status < 0 && did_quota)
1808 dquot_free_space_nodirty(inode,
1809 ocfs2_clusters_to_bytes(osb->sb, 1));
1810 if (status < 0 && did_quota_inode)
1811 dquot_free_inode(inode);
1812 if (handle)
1813 ocfs2_commit_trans(osb, handle);
1814
1815 ocfs2_inode_unlock(dir, 1);
1816 if (did_block_signals)
1817 ocfs2_unblock_signals(&oldset);
1818
1819 brelse(new_fe_bh);
1820 brelse(parent_fe_bh);
1821 kfree(si.name);
1822 kfree(si.value);
1823 ocfs2_free_dir_lookup_result(&lookup);
1824 if (inode_ac)
1825 ocfs2_free_alloc_context(inode_ac);
1826 if (data_ac)
1827 ocfs2_free_alloc_context(data_ac);
1828 if (xattr_ac)
1829 ocfs2_free_alloc_context(xattr_ac);
1830 if ((status < 0) && inode) {
1831 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
1832 clear_nlink(inode);
1833 iput(inode);
1834 }
1835
1836 if (status)
1837 mlog_errno(status);
1838
1839 return status;
1840 }
1841
1842 static int ocfs2_blkno_stringify(u64 blkno, char *name)
1843 {
1844 int status, namelen;
1845
1846 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1847 (long long)blkno);
1848 if (namelen <= 0) {
1849 if (namelen)
1850 status = namelen;
1851 else
1852 status = -EINVAL;
1853 mlog_errno(status);
1854 goto bail;
1855 }
1856 if (namelen != OCFS2_ORPHAN_NAMELEN) {
1857 status = -EINVAL;
1858 mlog_errno(status);
1859 goto bail;
1860 }
1861
1862 trace_ocfs2_blkno_stringify(blkno, name, namelen);
1863
1864 status = 0;
1865 bail:
1866 if (status < 0)
1867 mlog_errno(status);
1868 return status;
1869 }
1870
1871 static int ocfs2_lookup_lock_orphan_dir(struct ocfs2_super *osb,
1872 struct inode **ret_orphan_dir,
1873 struct buffer_head **ret_orphan_dir_bh)
1874 {
1875 struct inode *orphan_dir_inode;
1876 struct buffer_head *orphan_dir_bh = NULL;
1877 int ret = 0;
1878
1879 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
1880 ORPHAN_DIR_SYSTEM_INODE,
1881 osb->slot_num);
1882 if (!orphan_dir_inode) {
1883 ret = -ENOENT;
1884 mlog_errno(ret);
1885 return ret;
1886 }
1887
1888 mutex_lock(&orphan_dir_inode->i_mutex);
1889
1890 ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
1891 if (ret < 0) {
1892 mutex_unlock(&orphan_dir_inode->i_mutex);
1893 iput(orphan_dir_inode);
1894
1895 mlog_errno(ret);
1896 return ret;
1897 }
1898
1899 *ret_orphan_dir = orphan_dir_inode;
1900 *ret_orphan_dir_bh = orphan_dir_bh;
1901
1902 return 0;
1903 }
1904
1905 static int __ocfs2_prepare_orphan_dir(struct inode *orphan_dir_inode,
1906 struct buffer_head *orphan_dir_bh,
1907 u64 blkno,
1908 char *name,
1909 struct ocfs2_dir_lookup_result *lookup)
1910 {
1911 int ret;
1912 struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);
1913
1914 ret = ocfs2_blkno_stringify(blkno, name);
1915 if (ret < 0) {
1916 mlog_errno(ret);
1917 return ret;
1918 }
1919
1920 ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
1921 orphan_dir_bh, name,
1922 OCFS2_ORPHAN_NAMELEN, lookup);
1923 if (ret < 0) {
1924 mlog_errno(ret);
1925 return ret;
1926 }
1927
1928 return 0;
1929 }
1930
1931 /**
1932 * ocfs2_prepare_orphan_dir() - Prepare an orphan directory for
1933 * insertion of an orphan.
1934 * @osb: ocfs2 file system
1935 * @ret_orphan_dir: Orphan dir inode - returned locked!
1936 * @blkno: Actual block number of the inode to be inserted into orphan dir.
1937 * @lookup: dir lookup result, to be passed back into functions like
1938 * ocfs2_orphan_add
1939 *
1940 * Returns zero on success and the ret_orphan_dir, name and lookup
1941 * fields will be populated.
1942 *
1943 * Returns non-zero on failure.
1944 */
1945 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
1946 struct inode **ret_orphan_dir,
1947 u64 blkno,
1948 char *name,
1949 struct ocfs2_dir_lookup_result *lookup)
1950 {
1951 struct inode *orphan_dir_inode = NULL;
1952 struct buffer_head *orphan_dir_bh = NULL;
1953 int ret = 0;
1954
1955 ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode,
1956 &orphan_dir_bh);
1957 if (ret < 0) {
1958 mlog_errno(ret);
1959 return ret;
1960 }
1961
1962 ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh,
1963 blkno, name, lookup);
1964 if (ret < 0) {
1965 mlog_errno(ret);
1966 goto out;
1967 }
1968
1969 *ret_orphan_dir = orphan_dir_inode;
1970
1971 out:
1972 brelse(orphan_dir_bh);
1973
1974 if (ret) {
1975 ocfs2_inode_unlock(orphan_dir_inode, 1);
1976 mutex_unlock(&orphan_dir_inode->i_mutex);
1977 iput(orphan_dir_inode);
1978 }
1979
1980 if (ret)
1981 mlog_errno(ret);
1982 return ret;
1983 }
1984
1985 static int ocfs2_orphan_add(struct ocfs2_super *osb,
1986 handle_t *handle,
1987 struct inode *inode,
1988 struct buffer_head *fe_bh,
1989 char *name,
1990 struct ocfs2_dir_lookup_result *lookup,
1991 struct inode *orphan_dir_inode)
1992 {
1993 struct buffer_head *orphan_dir_bh = NULL;
1994 int status = 0;
1995 struct ocfs2_dinode *orphan_fe;
1996 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1997
1998 trace_ocfs2_orphan_add_begin(
1999 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2000
2001 status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
2002 if (status < 0) {
2003 mlog_errno(status);
2004 goto leave;
2005 }
2006
2007 status = ocfs2_journal_access_di(handle,
2008 INODE_CACHE(orphan_dir_inode),
2009 orphan_dir_bh,
2010 OCFS2_JOURNAL_ACCESS_WRITE);
2011 if (status < 0) {
2012 mlog_errno(status);
2013 goto leave;
2014 }
2015
2016 /*
2017 * We're going to journal the change of i_flags and i_orphaned_slot.
2018 * It's safe anyway, though some callers may duplicate the journaling.
2019 * Journaling within the func just make the logic look more
2020 * straightforward.
2021 */
2022 status = ocfs2_journal_access_di(handle,
2023 INODE_CACHE(inode),
2024 fe_bh,
2025 OCFS2_JOURNAL_ACCESS_WRITE);
2026 if (status < 0) {
2027 mlog_errno(status);
2028 goto leave;
2029 }
2030
2031 /* we're a cluster, and nlink can change on disk from
2032 * underneath us... */
2033 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2034 if (S_ISDIR(inode->i_mode))
2035 ocfs2_add_links_count(orphan_fe, 1);
2036 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2037 ocfs2_journal_dirty(handle, orphan_dir_bh);
2038
2039 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2040 OCFS2_ORPHAN_NAMELEN, inode,
2041 OCFS2_I(inode)->ip_blkno,
2042 orphan_dir_bh, lookup);
2043 if (status < 0) {
2044 mlog_errno(status);
2045 goto rollback;
2046 }
2047
2048 fe->i_flags |= cpu_to_le32(OCFS2_ORPHANED_FL);
2049 OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR;
2050
2051 /* Record which orphan dir our inode now resides
2052 * in. delete_inode will use this to determine which orphan
2053 * dir to lock. */
2054 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
2055
2056 ocfs2_journal_dirty(handle, fe_bh);
2057
2058 trace_ocfs2_orphan_add_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
2059 osb->slot_num);
2060
2061 rollback:
2062 if (status < 0) {
2063 if (S_ISDIR(inode->i_mode))
2064 ocfs2_add_links_count(orphan_fe, -1);
2065 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2066 }
2067
2068 leave:
2069 brelse(orphan_dir_bh);
2070
2071 return status;
2072 }
2073
2074 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2075 int ocfs2_orphan_del(struct ocfs2_super *osb,
2076 handle_t *handle,
2077 struct inode *orphan_dir_inode,
2078 struct inode *inode,
2079 struct buffer_head *orphan_dir_bh)
2080 {
2081 char name[OCFS2_ORPHAN_NAMELEN + 1];
2082 struct ocfs2_dinode *orphan_fe;
2083 int status = 0;
2084 struct ocfs2_dir_lookup_result lookup = { NULL, };
2085
2086 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2087 if (status < 0) {
2088 mlog_errno(status);
2089 goto leave;
2090 }
2091
2092 trace_ocfs2_orphan_del(
2093 (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2094 name, OCFS2_ORPHAN_NAMELEN);
2095
2096 /* find it's spot in the orphan directory */
2097 status = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, orphan_dir_inode,
2098 &lookup);
2099 if (status) {
2100 mlog_errno(status);
2101 goto leave;
2102 }
2103
2104 /* remove it from the orphan directory */
2105 status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup);
2106 if (status < 0) {
2107 mlog_errno(status);
2108 goto leave;
2109 }
2110
2111 status = ocfs2_journal_access_di(handle,
2112 INODE_CACHE(orphan_dir_inode),
2113 orphan_dir_bh,
2114 OCFS2_JOURNAL_ACCESS_WRITE);
2115 if (status < 0) {
2116 mlog_errno(status);
2117 goto leave;
2118 }
2119
2120 /* do the i_nlink dance! :) */
2121 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2122 if (S_ISDIR(inode->i_mode))
2123 ocfs2_add_links_count(orphan_fe, -1);
2124 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2125 ocfs2_journal_dirty(handle, orphan_dir_bh);
2126
2127 leave:
2128 ocfs2_free_dir_lookup_result(&lookup);
2129
2130 if (status)
2131 mlog_errno(status);
2132 return status;
2133 }
2134
2135 /**
2136 * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to receive a newly
2137 * allocated file. This is different from the typical 'add to orphan dir'
2138 * operation in that the inode does not yet exist. This is a problem because
2139 * the orphan dir stringifies the inode block number to come up with it's
2140 * dirent. Obviously if the inode does not yet exist we have a chicken and egg
2141 * problem. This function works around it by calling deeper into the orphan
2142 * and suballoc code than other callers. Use this only by necessity.
2143 * @dir: The directory which this inode will ultimately wind up under - not the
2144 * orphan dir!
2145 * @dir_bh: buffer_head the @dir inode block
2146 * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled
2147 * with the string to be used for orphan dirent. Pass back to the orphan dir
2148 * code.
2149 * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan
2150 * dir code.
2151 * @ret_di_blkno: block number where the new inode will be allocated.
2152 * @orphan_insert: Dir insert context to be passed back into orphan dir code.
2153 * @ret_inode_ac: Inode alloc context to be passed back to the allocator.
2154 *
2155 * Returns zero on success and the ret_orphan_dir, name and lookup
2156 * fields will be populated.
2157 *
2158 * Returns non-zero on failure.
2159 */
2160 static int ocfs2_prep_new_orphaned_file(struct inode *dir,
2161 struct buffer_head *dir_bh,
2162 char *orphan_name,
2163 struct inode **ret_orphan_dir,
2164 u64 *ret_di_blkno,
2165 struct ocfs2_dir_lookup_result *orphan_insert,
2166 struct ocfs2_alloc_context **ret_inode_ac)
2167 {
2168 int ret;
2169 u64 di_blkno;
2170 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2171 struct inode *orphan_dir = NULL;
2172 struct buffer_head *orphan_dir_bh = NULL;
2173 struct ocfs2_alloc_context *inode_ac = NULL;
2174
2175 ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh);
2176 if (ret < 0) {
2177 mlog_errno(ret);
2178 return ret;
2179 }
2180
2181 /* reserve an inode spot */
2182 ret = ocfs2_reserve_new_inode(osb, &inode_ac);
2183 if (ret < 0) {
2184 if (ret != -ENOSPC)
2185 mlog_errno(ret);
2186 goto out;
2187 }
2188
2189 ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
2190 &di_blkno);
2191 if (ret) {
2192 mlog_errno(ret);
2193 goto out;
2194 }
2195
2196 ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
2197 di_blkno, orphan_name, orphan_insert);
2198 if (ret < 0) {
2199 mlog_errno(ret);
2200 goto out;
2201 }
2202
2203 out:
2204 if (ret == 0) {
2205 *ret_orphan_dir = orphan_dir;
2206 *ret_di_blkno = di_blkno;
2207 *ret_inode_ac = inode_ac;
2208 /*
2209 * orphan_name and orphan_insert are already up to
2210 * date via prepare_orphan_dir
2211 */
2212 } else {
2213 /* Unroll reserve_new_inode* */
2214 if (inode_ac)
2215 ocfs2_free_alloc_context(inode_ac);
2216
2217 /* Unroll orphan dir locking */
2218 mutex_unlock(&orphan_dir->i_mutex);
2219 ocfs2_inode_unlock(orphan_dir, 1);
2220 iput(orphan_dir);
2221 }
2222
2223 brelse(orphan_dir_bh);
2224
2225 return ret;
2226 }
2227
2228 int ocfs2_create_inode_in_orphan(struct inode *dir,
2229 int mode,
2230 struct inode **new_inode)
2231 {
2232 int status, did_quota_inode = 0;
2233 struct inode *inode = NULL;
2234 struct inode *orphan_dir = NULL;
2235 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2236 struct ocfs2_dinode *di = NULL;
2237 handle_t *handle = NULL;
2238 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
2239 struct buffer_head *parent_di_bh = NULL;
2240 struct buffer_head *new_di_bh = NULL;
2241 struct ocfs2_alloc_context *inode_ac = NULL;
2242 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2243 u64 uninitialized_var(di_blkno), suballoc_loc;
2244 u16 suballoc_bit;
2245
2246 status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2247 if (status < 0) {
2248 if (status != -ENOENT)
2249 mlog_errno(status);
2250 return status;
2251 }
2252
2253 status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
2254 orphan_name, &orphan_dir,
2255 &di_blkno, &orphan_insert, &inode_ac);
2256 if (status < 0) {
2257 if (status != -ENOSPC)
2258 mlog_errno(status);
2259 goto leave;
2260 }
2261
2262 inode = ocfs2_get_init_inode(dir, mode);
2263 if (!inode) {
2264 status = -ENOMEM;
2265 mlog_errno(status);
2266 goto leave;
2267 }
2268
2269 handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
2270 if (IS_ERR(handle)) {
2271 status = PTR_ERR(handle);
2272 handle = NULL;
2273 mlog_errno(status);
2274 goto leave;
2275 }
2276
2277 status = dquot_alloc_inode(inode);
2278 if (status)
2279 goto leave;
2280 did_quota_inode = 1;
2281
2282 status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
2283 &suballoc_loc,
2284 &suballoc_bit, di_blkno);
2285 if (status < 0) {
2286 mlog_errno(status);
2287 goto leave;
2288 }
2289
2290 clear_nlink(inode);
2291 /* do the real work now. */
2292 status = __ocfs2_mknod_locked(dir, inode,
2293 0, &new_di_bh, parent_di_bh, handle,
2294 inode_ac, di_blkno, suballoc_loc,
2295 suballoc_bit);
2296 if (status < 0) {
2297 mlog_errno(status);
2298 goto leave;
2299 }
2300
2301 di = (struct ocfs2_dinode *)new_di_bh->b_data;
2302 status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
2303 &orphan_insert, orphan_dir);
2304 if (status < 0) {
2305 mlog_errno(status);
2306 goto leave;
2307 }
2308
2309 /* get open lock so that only nodes can't remove it from orphan dir. */
2310 status = ocfs2_open_lock(inode);
2311 if (status < 0)
2312 mlog_errno(status);
2313
2314 insert_inode_hash(inode);
2315 leave:
2316 if (status < 0 && did_quota_inode)
2317 dquot_free_inode(inode);
2318 if (handle)
2319 ocfs2_commit_trans(osb, handle);
2320
2321 if (orphan_dir) {
2322 /* This was locked for us in ocfs2_prepare_orphan_dir() */
2323 ocfs2_inode_unlock(orphan_dir, 1);
2324 mutex_unlock(&orphan_dir->i_mutex);
2325 iput(orphan_dir);
2326 }
2327
2328 if ((status < 0) && inode) {
2329 clear_nlink(inode);
2330 iput(inode);
2331 }
2332
2333 if (inode_ac)
2334 ocfs2_free_alloc_context(inode_ac);
2335
2336 brelse(new_di_bh);
2337
2338 if (!status)
2339 *new_inode = inode;
2340
2341 ocfs2_free_dir_lookup_result(&orphan_insert);
2342
2343 ocfs2_inode_unlock(dir, 1);
2344 brelse(parent_di_bh);
2345 return status;
2346 }
2347
2348 int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
2349 struct inode *inode,
2350 struct dentry *dentry)
2351 {
2352 int status = 0;
2353 struct buffer_head *parent_di_bh = NULL;
2354 handle_t *handle = NULL;
2355 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2356 struct ocfs2_dinode *dir_di, *di;
2357 struct inode *orphan_dir_inode = NULL;
2358 struct buffer_head *orphan_dir_bh = NULL;
2359 struct buffer_head *di_bh = NULL;
2360 struct ocfs2_dir_lookup_result lookup = { NULL, };
2361
2362 trace_ocfs2_mv_orphaned_inode_to_new(dir, dentry,
2363 dentry->d_name.len, dentry->d_name.name,
2364 (unsigned long long)OCFS2_I(dir)->ip_blkno,
2365 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2366
2367 status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2368 if (status < 0) {
2369 if (status != -ENOENT)
2370 mlog_errno(status);
2371 return status;
2372 }
2373
2374 dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
2375 if (!dir_di->i_links_count) {
2376 /* can't make a file in a deleted directory. */
2377 status = -ENOENT;
2378 goto leave;
2379 }
2380
2381 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
2382 dentry->d_name.len);
2383 if (status)
2384 goto leave;
2385
2386 /* get a spot inside the dir. */
2387 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_di_bh,
2388 dentry->d_name.name,
2389 dentry->d_name.len, &lookup);
2390 if (status < 0) {
2391 mlog_errno(status);
2392 goto leave;
2393 }
2394
2395 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2396 ORPHAN_DIR_SYSTEM_INODE,
2397 osb->slot_num);
2398 if (!orphan_dir_inode) {
2399 status = -EEXIST;
2400 mlog_errno(status);
2401 goto leave;
2402 }
2403
2404 mutex_lock(&orphan_dir_inode->i_mutex);
2405
2406 status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2407 if (status < 0) {
2408 mlog_errno(status);
2409 mutex_unlock(&orphan_dir_inode->i_mutex);
2410 iput(orphan_dir_inode);
2411 goto leave;
2412 }
2413
2414 status = ocfs2_read_inode_block(inode, &di_bh);
2415 if (status < 0) {
2416 mlog_errno(status);
2417 goto orphan_unlock;
2418 }
2419
2420 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
2421 if (IS_ERR(handle)) {
2422 status = PTR_ERR(handle);
2423 handle = NULL;
2424 mlog_errno(status);
2425 goto orphan_unlock;
2426 }
2427
2428 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
2429 di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2430 if (status < 0) {
2431 mlog_errno(status);
2432 goto out_commit;
2433 }
2434
2435 status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
2436 orphan_dir_bh);
2437 if (status < 0) {
2438 mlog_errno(status);
2439 goto out_commit;
2440 }
2441
2442 di = (struct ocfs2_dinode *)di_bh->b_data;
2443 di->i_flags &= ~cpu_to_le32(OCFS2_ORPHANED_FL);
2444 di->i_orphaned_slot = 0;
2445 set_nlink(inode, 1);
2446 ocfs2_set_links_count(di, inode->i_nlink);
2447 ocfs2_journal_dirty(handle, di_bh);
2448
2449 status = ocfs2_add_entry(handle, dentry, inode,
2450 OCFS2_I(inode)->ip_blkno, parent_di_bh,
2451 &lookup);
2452 if (status < 0) {
2453 mlog_errno(status);
2454 goto out_commit;
2455 }
2456
2457 status = ocfs2_dentry_attach_lock(dentry, inode,
2458 OCFS2_I(dir)->ip_blkno);
2459 if (status) {
2460 mlog_errno(status);
2461 goto out_commit;
2462 }
2463
2464 d_instantiate(dentry, inode);
2465 status = 0;
2466 out_commit:
2467 ocfs2_commit_trans(osb, handle);
2468 orphan_unlock:
2469 ocfs2_inode_unlock(orphan_dir_inode, 1);
2470 mutex_unlock(&orphan_dir_inode->i_mutex);
2471 iput(orphan_dir_inode);
2472 leave:
2473
2474 ocfs2_inode_unlock(dir, 1);
2475
2476 brelse(di_bh);
2477 brelse(parent_di_bh);
2478 brelse(orphan_dir_bh);
2479
2480 ocfs2_free_dir_lookup_result(&lookup);
2481
2482 if (status)
2483 mlog_errno(status);
2484
2485 return status;
2486 }
2487
2488 const struct inode_operations ocfs2_dir_iops = {
2489 .create = ocfs2_create,
2490 .lookup = ocfs2_lookup,
2491 .link = ocfs2_link,
2492 .unlink = ocfs2_unlink,
2493 .rmdir = ocfs2_unlink,
2494 .symlink = ocfs2_symlink,
2495 .mkdir = ocfs2_mkdir,
2496 .mknod = ocfs2_mknod,
2497 .rename = ocfs2_rename,
2498 .setattr = ocfs2_setattr,
2499 .getattr = ocfs2_getattr,
2500 .permission = ocfs2_permission,
2501 .setxattr = generic_setxattr,
2502 .getxattr = generic_getxattr,
2503 .listxattr = ocfs2_listxattr,
2504 .removexattr = generic_removexattr,
2505 .fiemap = ocfs2_fiemap,
2506 .get_acl = ocfs2_iop_get_acl,
2507 };
Linus' kernel tree