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wil6210: reduce dmesg pollution after FW crash
[linux-2.6/btrfs-unstable.git] / fs / ocfs2 / namei.c
blobf4d609be940086794ff8e64b1ed7cd832ba517f5
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 struct posix_acl *default_acl = NULL, *acl = NULL;
234
235 trace_ocfs2_mknod(dir, dentry, dentry->d_name.len, dentry->d_name.name,
236 (unsigned long long)OCFS2_I(dir)->ip_blkno,
237 (unsigned long)dev, mode);
238
239 dquot_initialize(dir);
240
241 /* get our super block */
242 osb = OCFS2_SB(dir->i_sb);
243
244 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
245 if (status < 0) {
246 if (status != -ENOENT)
247 mlog_errno(status);
248 return status;
249 }
250
251 if (S_ISDIR(mode) && (dir->i_nlink >= ocfs2_link_max(osb))) {
252 status = -EMLINK;
253 goto leave;
254 }
255
256 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
257 if (!ocfs2_read_links_count(dirfe)) {
258 /* can't make a file in a deleted directory. */
259 status = -ENOENT;
260 goto leave;
261 }
262
263 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
264 dentry->d_name.len);
265 if (status)
266 goto leave;
267
268 /* get a spot inside the dir. */
269 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
270 dentry->d_name.name,
271 dentry->d_name.len, &lookup);
272 if (status < 0) {
273 mlog_errno(status);
274 goto leave;
275 }
276
277 /* reserve an inode spot */
278 status = ocfs2_reserve_new_inode(osb, &inode_ac);
279 if (status < 0) {
280 if (status != -ENOSPC)
281 mlog_errno(status);
282 goto leave;
283 }
284
285 inode = ocfs2_get_init_inode(dir, mode);
286 if (!inode) {
287 status = -ENOMEM;
288 mlog_errno(status);
289 goto leave;
290 }
291
292 /* get security xattr */
293 status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
294 if (status) {
295 if (status == -EOPNOTSUPP)
296 si.enable = 0;
297 else {
298 mlog_errno(status);
299 goto leave;
300 }
301 }
302
303 /* calculate meta data/clusters for setting security and acl xattr */
304 status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
305 &si, &want_clusters,
306 &xattr_credits, &want_meta);
307 if (status < 0) {
308 mlog_errno(status);
309 goto leave;
310 }
311
312 /* Reserve a cluster if creating an extent based directory. */
313 if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
314 want_clusters += 1;
315
316 /* Dir indexing requires extra space as well */
317 if (ocfs2_supports_indexed_dirs(osb))
318 want_meta++;
319 }
320
321 status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac);
322 if (status < 0) {
323 if (status != -ENOSPC)
324 mlog_errno(status);
325 goto leave;
326 }
327
328 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
329 if (status < 0) {
330 if (status != -ENOSPC)
331 mlog_errno(status);
332 goto leave;
333 }
334
335 status = posix_acl_create(dir, &mode, &default_acl, &acl);
336 if (status) {
337 mlog_errno(status);
338 goto leave;
339 }
340
341 handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb,
342 S_ISDIR(mode),
343 xattr_credits));
344 if (IS_ERR(handle)) {
345 status = PTR_ERR(handle);
346 handle = NULL;
347 mlog_errno(status);
348 goto leave;
349 }
350
351 /* Starting to change things, restart is no longer possible. */
352 ocfs2_block_signals(&oldset);
353 did_block_signals = 1;
354
355 status = dquot_alloc_inode(inode);
356 if (status)
357 goto leave;
358 did_quota_inode = 1;
359
360 /* do the real work now. */
361 status = ocfs2_mknod_locked(osb, dir, inode, dev,
362 &new_fe_bh, parent_fe_bh, handle,
363 inode_ac);
364 if (status < 0) {
365 mlog_errno(status);
366 goto leave;
367 }
368
369 if (S_ISDIR(mode)) {
370 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
371 new_fe_bh, data_ac, meta_ac);
372 if (status < 0) {
373 mlog_errno(status);
374 goto leave;
375 }
376
377 status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
378 parent_fe_bh,
379 OCFS2_JOURNAL_ACCESS_WRITE);
380 if (status < 0) {
381 mlog_errno(status);
382 goto leave;
383 }
384 ocfs2_add_links_count(dirfe, 1);
385 ocfs2_journal_dirty(handle, parent_fe_bh);
386 inc_nlink(dir);
387 }
388
389 if (default_acl) {
390 status = ocfs2_set_acl(handle, inode, new_fe_bh,
391 ACL_TYPE_DEFAULT, default_acl,
392 meta_ac, data_ac);
393 }
394 if (!status && acl) {
395 status = ocfs2_set_acl(handle, inode, new_fe_bh,
396 ACL_TYPE_ACCESS, acl,
397 meta_ac, data_ac);
398 }
399
400 if (status < 0) {
401 mlog_errno(status);
402 goto leave;
403 }
404
405 if (si.enable) {
406 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
407 meta_ac, data_ac);
408 if (status < 0) {
409 mlog_errno(status);
410 goto leave;
411 }
412 }
413
414 /*
415 * Do this before adding the entry to the directory. We add
416 * also set d_op after success so that ->d_iput() will cleanup
417 * the dentry lock even if ocfs2_add_entry() fails below.
418 */
419 status = ocfs2_dentry_attach_lock(dentry, inode,
420 OCFS2_I(dir)->ip_blkno);
421 if (status) {
422 mlog_errno(status);
423 goto leave;
424 }
425
426 status = ocfs2_add_entry(handle, dentry, inode,
427 OCFS2_I(inode)->ip_blkno, parent_fe_bh,
428 &lookup);
429 if (status < 0) {
430 mlog_errno(status);
431 goto leave;
432 }
433
434 insert_inode_hash(inode);
435 d_instantiate(dentry, inode);
436 status = 0;
437 leave:
438 if (default_acl)
439 posix_acl_release(default_acl);
440 if (acl)
441 posix_acl_release(acl);
442 if (status < 0 && did_quota_inode)
443 dquot_free_inode(inode);
444 if (handle)
445 ocfs2_commit_trans(osb, handle);
446
447 ocfs2_inode_unlock(dir, 1);
448 if (did_block_signals)
449 ocfs2_unblock_signals(&oldset);
450
451 brelse(new_fe_bh);
452 brelse(parent_fe_bh);
453 kfree(si.name);
454 kfree(si.value);
455
456 ocfs2_free_dir_lookup_result(&lookup);
457
458 if (inode_ac)
459 ocfs2_free_alloc_context(inode_ac);
460
461 if (data_ac)
462 ocfs2_free_alloc_context(data_ac);
463
464 if (meta_ac)
465 ocfs2_free_alloc_context(meta_ac);
466
467 /*
468 * We should call iput after the i_mutex of the bitmap been
469 * unlocked in ocfs2_free_alloc_context, or the
470 * ocfs2_delete_inode will mutex_lock again.
471 */
472 if ((status < 0) && inode) {
473 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
474 clear_nlink(inode);
475 iput(inode);
476 }
477
478 if (status)
479 mlog_errno(status);
480
481 return status;
482 }
483
484 static int __ocfs2_mknod_locked(struct inode *dir,
485 struct inode *inode,
486 dev_t dev,
487 struct buffer_head **new_fe_bh,
488 struct buffer_head *parent_fe_bh,
489 handle_t *handle,
490 struct ocfs2_alloc_context *inode_ac,
491 u64 fe_blkno, u64 suballoc_loc, u16 suballoc_bit)
492 {
493 int status = 0;
494 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
495 struct ocfs2_dinode *fe = NULL;
496 struct ocfs2_extent_list *fel;
497 u16 feat;
498
499 *new_fe_bh = NULL;
500
501 /* populate as many fields early on as possible - many of
502 * these are used by the support functions here and in
503 * callers. */
504 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
505 OCFS2_I(inode)->ip_blkno = fe_blkno;
506 spin_lock(&osb->osb_lock);
507 inode->i_generation = osb->s_next_generation++;
508 spin_unlock(&osb->osb_lock);
509
510 *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
511 if (!*new_fe_bh) {
512 status = -ENOMEM;
513 mlog_errno(status);
514 goto leave;
515 }
516 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), *new_fe_bh);
517
518 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
519 *new_fe_bh,
520 OCFS2_JOURNAL_ACCESS_CREATE);
521 if (status < 0) {
522 mlog_errno(status);
523 goto leave;
524 }
525
526 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
527 memset(fe, 0, osb->sb->s_blocksize);
528
529 fe->i_generation = cpu_to_le32(inode->i_generation);
530 fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
531 fe->i_blkno = cpu_to_le64(fe_blkno);
532 fe->i_suballoc_loc = cpu_to_le64(suballoc_loc);
533 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
534 fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot);
535 fe->i_uid = cpu_to_le32(i_uid_read(inode));
536 fe->i_gid = cpu_to_le32(i_gid_read(inode));
537 fe->i_mode = cpu_to_le16(inode->i_mode);
538 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
539 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
540
541 ocfs2_set_links_count(fe, inode->i_nlink);
542
543 fe->i_last_eb_blk = 0;
544 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
545 fe->i_flags |= cpu_to_le32(OCFS2_VALID_FL);
546 fe->i_atime = fe->i_ctime = fe->i_mtime =
547 cpu_to_le64(CURRENT_TIME.tv_sec);
548 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
549 cpu_to_le32(CURRENT_TIME.tv_nsec);
550 fe->i_dtime = 0;
551
552 /*
553 * If supported, directories start with inline data. If inline
554 * isn't supported, but indexing is, we start them as indexed.
555 */
556 feat = le16_to_cpu(fe->i_dyn_features);
557 if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
558 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
559
560 fe->id2.i_data.id_count = cpu_to_le16(
561 ocfs2_max_inline_data_with_xattr(osb->sb, fe));
562 } else {
563 fel = &fe->id2.i_list;
564 fel->l_tree_depth = 0;
565 fel->l_next_free_rec = 0;
566 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
567 }
568
569 ocfs2_journal_dirty(handle, *new_fe_bh);
570
571 ocfs2_populate_inode(inode, fe, 1);
572 ocfs2_ci_set_new(osb, INODE_CACHE(inode));
573 if (!ocfs2_mount_local(osb)) {
574 status = ocfs2_create_new_inode_locks(inode);
575 if (status < 0)
576 mlog_errno(status);
577 }
578
579 status = 0; /* error in ocfs2_create_new_inode_locks is not
580 * critical */
581
582 leave:
583 if (status < 0) {
584 if (*new_fe_bh) {
585 brelse(*new_fe_bh);
586 *new_fe_bh = NULL;
587 }
588 }
589
590 if (status)
591 mlog_errno(status);
592 return status;
593 }
594
595 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
596 struct inode *dir,
597 struct inode *inode,
598 dev_t dev,
599 struct buffer_head **new_fe_bh,
600 struct buffer_head *parent_fe_bh,
601 handle_t *handle,
602 struct ocfs2_alloc_context *inode_ac)
603 {
604 int status = 0;
605 u64 suballoc_loc, fe_blkno = 0;
606 u16 suballoc_bit;
607
608 *new_fe_bh = NULL;
609
610 status = ocfs2_claim_new_inode(handle, dir, parent_fe_bh,
611 inode_ac, &suballoc_loc,
612 &suballoc_bit, &fe_blkno);
613 if (status < 0) {
614 mlog_errno(status);
615 return status;
616 }
617
618 return __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
619 parent_fe_bh, handle, inode_ac,
620 fe_blkno, suballoc_loc, suballoc_bit);
621 }
622
623 static int ocfs2_mkdir(struct inode *dir,
624 struct dentry *dentry,
625 umode_t mode)
626 {
627 int ret;
628
629 trace_ocfs2_mkdir(dir, dentry, dentry->d_name.len, dentry->d_name.name,
630 OCFS2_I(dir)->ip_blkno, mode);
631 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
632 if (ret)
633 mlog_errno(ret);
634
635 return ret;
636 }
637
638 static int ocfs2_create(struct inode *dir,
639 struct dentry *dentry,
640 umode_t mode,
641 bool excl)
642 {
643 int ret;
644
645 trace_ocfs2_create(dir, dentry, dentry->d_name.len, dentry->d_name.name,
646 (unsigned long long)OCFS2_I(dir)->ip_blkno, mode);
647 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
648 if (ret)
649 mlog_errno(ret);
650
651 return ret;
652 }
653
654 static int ocfs2_link(struct dentry *old_dentry,
655 struct inode *dir,
656 struct dentry *dentry)
657 {
658 handle_t *handle;
659 struct inode *inode = old_dentry->d_inode;
660 int err;
661 struct buffer_head *fe_bh = NULL;
662 struct buffer_head *parent_fe_bh = NULL;
663 struct ocfs2_dinode *fe = NULL;
664 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
665 struct ocfs2_dir_lookup_result lookup = { NULL, };
666 sigset_t oldset;
667
668 trace_ocfs2_link((unsigned long long)OCFS2_I(inode)->ip_blkno,
669 old_dentry->d_name.len, old_dentry->d_name.name,
670 dentry->d_name.len, dentry->d_name.name);
671
672 if (S_ISDIR(inode->i_mode))
673 return -EPERM;
674
675 dquot_initialize(dir);
676
677 err = ocfs2_inode_lock_nested(dir, &parent_fe_bh, 1, OI_LS_PARENT);
678 if (err < 0) {
679 if (err != -ENOENT)
680 mlog_errno(err);
681 return err;
682 }
683
684 if (!dir->i_nlink) {
685 err = -ENOENT;
686 goto out;
687 }
688
689 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
690 dentry->d_name.len);
691 if (err)
692 goto out;
693
694 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
695 dentry->d_name.name,
696 dentry->d_name.len, &lookup);
697 if (err < 0) {
698 mlog_errno(err);
699 goto out;
700 }
701
702 err = ocfs2_inode_lock(inode, &fe_bh, 1);
703 if (err < 0) {
704 if (err != -ENOENT)
705 mlog_errno(err);
706 goto out;
707 }
708
709 fe = (struct ocfs2_dinode *) fe_bh->b_data;
710 if (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) {
711 err = -EMLINK;
712 goto out_unlock_inode;
713 }
714
715 handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb));
716 if (IS_ERR(handle)) {
717 err = PTR_ERR(handle);
718 handle = NULL;
719 mlog_errno(err);
720 goto out_unlock_inode;
721 }
722
723 /* Starting to change things, restart is no longer possible. */
724 ocfs2_block_signals(&oldset);
725
726 err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
727 OCFS2_JOURNAL_ACCESS_WRITE);
728 if (err < 0) {
729 mlog_errno(err);
730 goto out_commit;
731 }
732
733 inc_nlink(inode);
734 inode->i_ctime = CURRENT_TIME;
735 ocfs2_set_links_count(fe, inode->i_nlink);
736 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
737 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
738 ocfs2_journal_dirty(handle, fe_bh);
739
740 err = ocfs2_add_entry(handle, dentry, inode,
741 OCFS2_I(inode)->ip_blkno,
742 parent_fe_bh, &lookup);
743 if (err) {
744 ocfs2_add_links_count(fe, -1);
745 drop_nlink(inode);
746 mlog_errno(err);
747 goto out_commit;
748 }
749
750 err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
751 if (err) {
752 mlog_errno(err);
753 goto out_commit;
754 }
755
756 ihold(inode);
757 d_instantiate(dentry, inode);
758
759 out_commit:
760 ocfs2_commit_trans(osb, handle);
761 ocfs2_unblock_signals(&oldset);
762 out_unlock_inode:
763 ocfs2_inode_unlock(inode, 1);
764
765 out:
766 ocfs2_inode_unlock(dir, 1);
767
768 brelse(fe_bh);
769 brelse(parent_fe_bh);
770
771 ocfs2_free_dir_lookup_result(&lookup);
772
773 if (err)
774 mlog_errno(err);
775
776 return err;
777 }
778
779 /*
780 * Takes and drops an exclusive lock on the given dentry. This will
781 * force other nodes to drop it.
782 */
783 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
784 {
785 int ret;
786
787 ret = ocfs2_dentry_lock(dentry, 1);
788 if (ret)
789 mlog_errno(ret);
790 else
791 ocfs2_dentry_unlock(dentry, 1);
792
793 return ret;
794 }
795
796 static inline int ocfs2_inode_is_unlinkable(struct inode *inode)
797 {
798 if (S_ISDIR(inode->i_mode)) {
799 if (inode->i_nlink == 2)
800 return 1;
801 return 0;
802 }
803
804 if (inode->i_nlink == 1)
805 return 1;
806 return 0;
807 }
808
809 static int ocfs2_unlink(struct inode *dir,
810 struct dentry *dentry)
811 {
812 int status;
813 int child_locked = 0;
814 bool is_unlinkable = false;
815 struct inode *inode = dentry->d_inode;
816 struct inode *orphan_dir = NULL;
817 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
818 u64 blkno;
819 struct ocfs2_dinode *fe = NULL;
820 struct buffer_head *fe_bh = NULL;
821 struct buffer_head *parent_node_bh = NULL;
822 handle_t *handle = NULL;
823 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
824 struct ocfs2_dir_lookup_result lookup = { NULL, };
825 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
826
827 trace_ocfs2_unlink(dir, dentry, dentry->d_name.len,
828 dentry->d_name.name,
829 (unsigned long long)OCFS2_I(dir)->ip_blkno,
830 (unsigned long long)OCFS2_I(inode)->ip_blkno);
831
832 dquot_initialize(dir);
833
834 BUG_ON(dentry->d_parent->d_inode != dir);
835
836 if (inode == osb->root_inode)
837 return -EPERM;
838
839 status = ocfs2_inode_lock_nested(dir, &parent_node_bh, 1,
840 OI_LS_PARENT);
841 if (status < 0) {
842 if (status != -ENOENT)
843 mlog_errno(status);
844 return status;
845 }
846
847 status = ocfs2_find_files_on_disk(dentry->d_name.name,
848 dentry->d_name.len, &blkno, dir,
849 &lookup);
850 if (status < 0) {
851 if (status != -ENOENT)
852 mlog_errno(status);
853 goto leave;
854 }
855
856 if (OCFS2_I(inode)->ip_blkno != blkno) {
857 status = -ENOENT;
858
859 trace_ocfs2_unlink_noent(
860 (unsigned long long)OCFS2_I(inode)->ip_blkno,
861 (unsigned long long)blkno,
862 OCFS2_I(inode)->ip_flags);
863 goto leave;
864 }
865
866 status = ocfs2_inode_lock(inode, &fe_bh, 1);
867 if (status < 0) {
868 if (status != -ENOENT)
869 mlog_errno(status);
870 goto leave;
871 }
872 child_locked = 1;
873
874 if (S_ISDIR(inode->i_mode)) {
875 if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
876 status = -ENOTEMPTY;
877 goto leave;
878 }
879 }
880
881 status = ocfs2_remote_dentry_delete(dentry);
882 if (status < 0) {
883 /* This remote delete should succeed under all normal
884 * circumstances. */
885 mlog_errno(status);
886 goto leave;
887 }
888
889 if (ocfs2_inode_is_unlinkable(inode)) {
890 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
891 OCFS2_I(inode)->ip_blkno,
892 orphan_name, &orphan_insert);
893 if (status < 0) {
894 mlog_errno(status);
895 goto leave;
896 }
897 is_unlinkable = true;
898 }
899
900 handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb));
901 if (IS_ERR(handle)) {
902 status = PTR_ERR(handle);
903 handle = NULL;
904 mlog_errno(status);
905 goto leave;
906 }
907
908 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
909 OCFS2_JOURNAL_ACCESS_WRITE);
910 if (status < 0) {
911 mlog_errno(status);
912 goto leave;
913 }
914
915 fe = (struct ocfs2_dinode *) fe_bh->b_data;
916
917 /* delete the name from the parent dir */
918 status = ocfs2_delete_entry(handle, dir, &lookup);
919 if (status < 0) {
920 mlog_errno(status);
921 goto leave;
922 }
923
924 if (S_ISDIR(inode->i_mode))
925 drop_nlink(inode);
926 drop_nlink(inode);
927 ocfs2_set_links_count(fe, inode->i_nlink);
928 ocfs2_journal_dirty(handle, fe_bh);
929
930 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
931 if (S_ISDIR(inode->i_mode))
932 drop_nlink(dir);
933
934 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
935 if (status < 0) {
936 mlog_errno(status);
937 if (S_ISDIR(inode->i_mode))
938 inc_nlink(dir);
939 goto leave;
940 }
941
942 if (is_unlinkable) {
943 status = ocfs2_orphan_add(osb, handle, inode, fe_bh,
944 orphan_name, &orphan_insert, orphan_dir);
945 if (status < 0)
946 mlog_errno(status);
947 }
948
949 leave:
950 if (handle)
951 ocfs2_commit_trans(osb, handle);
952
953 if (child_locked)
954 ocfs2_inode_unlock(inode, 1);
955
956 ocfs2_inode_unlock(dir, 1);
957
958 if (orphan_dir) {
959 /* This was locked for us in ocfs2_prepare_orphan_dir() */
960 ocfs2_inode_unlock(orphan_dir, 1);
961 mutex_unlock(&orphan_dir->i_mutex);
962 iput(orphan_dir);
963 }
964
965 brelse(fe_bh);
966 brelse(parent_node_bh);
967
968 ocfs2_free_dir_lookup_result(&orphan_insert);
969 ocfs2_free_dir_lookup_result(&lookup);
970
971 if (status && (status != -ENOTEMPTY) && (status != -ENOENT))
972 mlog_errno(status);
973
974 return status;
975 }
976
977 /*
978 * The only place this should be used is rename!
979 * if they have the same id, then the 1st one is the only one locked.
980 */
981 static int ocfs2_double_lock(struct ocfs2_super *osb,
982 struct buffer_head **bh1,
983 struct inode *inode1,
984 struct buffer_head **bh2,
985 struct inode *inode2)
986 {
987 int status;
988 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
989 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
990 struct buffer_head **tmpbh;
991 struct inode *tmpinode;
992
993 trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno,
994 (unsigned long long)oi2->ip_blkno);
995
996 if (*bh1)
997 *bh1 = NULL;
998 if (*bh2)
999 *bh2 = NULL;
1000
1001 /* we always want to lock the one with the lower lockid first. */
1002 if (oi1->ip_blkno != oi2->ip_blkno) {
1003 if (oi1->ip_blkno < oi2->ip_blkno) {
1004 /* switch id1 and id2 around */
1005 tmpbh = bh2;
1006 bh2 = bh1;
1007 bh1 = tmpbh;
1008
1009 tmpinode = inode2;
1010 inode2 = inode1;
1011 inode1 = tmpinode;
1012 }
1013 /* lock id2 */
1014 status = ocfs2_inode_lock_nested(inode2, bh2, 1,
1015 OI_LS_RENAME1);
1016 if (status < 0) {
1017 if (status != -ENOENT)
1018 mlog_errno(status);
1019 goto bail;
1020 }
1021 }
1022
1023 /* lock id1 */
1024 status = ocfs2_inode_lock_nested(inode1, bh1, 1, OI_LS_RENAME2);
1025 if (status < 0) {
1026 /*
1027 * An error return must mean that no cluster locks
1028 * were held on function exit.
1029 */
1030 if (oi1->ip_blkno != oi2->ip_blkno) {
1031 ocfs2_inode_unlock(inode2, 1);
1032 brelse(*bh2);
1033 *bh2 = NULL;
1034 }
1035
1036 if (status != -ENOENT)
1037 mlog_errno(status);
1038 }
1039
1040 trace_ocfs2_double_lock_end(
1041 (unsigned long long)OCFS2_I(inode1)->ip_blkno,
1042 (unsigned long long)OCFS2_I(inode2)->ip_blkno);
1043
1044 bail:
1045 if (status)
1046 mlog_errno(status);
1047 return status;
1048 }
1049
1050 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1051 {
1052 ocfs2_inode_unlock(inode1, 1);
1053
1054 if (inode1 != inode2)
1055 ocfs2_inode_unlock(inode2, 1);
1056 }
1057
1058 static int ocfs2_rename(struct inode *old_dir,
1059 struct dentry *old_dentry,
1060 struct inode *new_dir,
1061 struct dentry *new_dentry)
1062 {
1063 int status = 0, rename_lock = 0, parents_locked = 0, target_exists = 0;
1064 int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 0;
1065 struct inode *old_inode = old_dentry->d_inode;
1066 struct inode *new_inode = new_dentry->d_inode;
1067 struct inode *orphan_dir = NULL;
1068 struct ocfs2_dinode *newfe = NULL;
1069 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1070 struct buffer_head *newfe_bh = NULL;
1071 struct buffer_head *old_inode_bh = NULL;
1072 struct ocfs2_super *osb = NULL;
1073 u64 newfe_blkno, old_de_ino;
1074 handle_t *handle = NULL;
1075 struct buffer_head *old_dir_bh = NULL;
1076 struct buffer_head *new_dir_bh = NULL;
1077 u32 old_dir_nlink = old_dir->i_nlink;
1078 struct ocfs2_dinode *old_di;
1079 struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
1080 struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
1081 struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
1082 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
1083 struct ocfs2_dir_lookup_result target_insert = { NULL, };
1084
1085 /* At some point it might be nice to break this function up a
1086 * bit. */
1087
1088 trace_ocfs2_rename(old_dir, old_dentry, new_dir, new_dentry,
1089 old_dentry->d_name.len, old_dentry->d_name.name,
1090 new_dentry->d_name.len, new_dentry->d_name.name);
1091
1092 dquot_initialize(old_dir);
1093 dquot_initialize(new_dir);
1094
1095 osb = OCFS2_SB(old_dir->i_sb);
1096
1097 if (new_inode) {
1098 if (!igrab(new_inode))
1099 BUG();
1100 }
1101
1102 /* Assume a directory hierarchy thusly:
1103 * a/b/c
1104 * a/d
1105 * a,b,c, and d are all directories.
1106 *
1107 * from cwd of 'a' on both nodes:
1108 * node1: mv b/c d
1109 * node2: mv d b/c
1110 *
1111 * And that's why, just like the VFS, we need a file system
1112 * rename lock. */
1113 if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
1114 status = ocfs2_rename_lock(osb);
1115 if (status < 0) {
1116 mlog_errno(status);
1117 goto bail;
1118 }
1119 rename_lock = 1;
1120 }
1121
1122 /* if old and new are the same, this'll just do one lock. */
1123 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1124 &new_dir_bh, new_dir);
1125 if (status < 0) {
1126 mlog_errno(status);
1127 goto bail;
1128 }
1129 parents_locked = 1;
1130
1131 /* make sure both dirs have bhs
1132 * get an extra ref on old_dir_bh if old==new */
1133 if (!new_dir_bh) {
1134 if (old_dir_bh) {
1135 new_dir_bh = old_dir_bh;
1136 get_bh(new_dir_bh);
1137 } else {
1138 mlog(ML_ERROR, "no old_dir_bh!\n");
1139 status = -EIO;
1140 goto bail;
1141 }
1142 }
1143
1144 /*
1145 * Aside from allowing a meta data update, the locking here
1146 * also ensures that the downconvert thread on other nodes
1147 * won't have to concurrently downconvert the inode and the
1148 * dentry locks.
1149 */
1150 status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
1151 OI_LS_PARENT);
1152 if (status < 0) {
1153 if (status != -ENOENT)
1154 mlog_errno(status);
1155 goto bail;
1156 }
1157 old_child_locked = 1;
1158
1159 status = ocfs2_remote_dentry_delete(old_dentry);
1160 if (status < 0) {
1161 mlog_errno(status);
1162 goto bail;
1163 }
1164
1165 if (S_ISDIR(old_inode->i_mode)) {
1166 u64 old_inode_parent;
1167
1168 update_dot_dot = 1;
1169 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1170 old_inode,
1171 &old_inode_dot_dot_res);
1172 if (status) {
1173 status = -EIO;
1174 goto bail;
1175 }
1176
1177 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1178 status = -EIO;
1179 goto bail;
1180 }
1181
1182 if (!new_inode && new_dir != old_dir &&
1183 new_dir->i_nlink >= ocfs2_link_max(osb)) {
1184 status = -EMLINK;
1185 goto bail;
1186 }
1187 }
1188
1189 status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1190 old_dentry->d_name.len,
1191 &old_de_ino);
1192 if (status) {
1193 status = -ENOENT;
1194 goto bail;
1195 }
1196
1197 /*
1198 * Check for inode number is _not_ due to possible IO errors.
1199 * We might rmdir the source, keep it as pwd of some process
1200 * and merrily kill the link to whatever was created under the
1201 * same name. Goodbye sticky bit ;-<
1202 */
1203 if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1204 status = -ENOENT;
1205 goto bail;
1206 }
1207
1208 /* check if the target already exists (in which case we need
1209 * to delete it */
1210 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1211 new_dentry->d_name.len,
1212 &newfe_blkno, new_dir,
1213 &target_lookup_res);
1214 /* The only error we allow here is -ENOENT because the new
1215 * file not existing is perfectly valid. */
1216 if ((status < 0) && (status != -ENOENT)) {
1217 /* If we cannot find the file specified we should just */
1218 /* return the error... */
1219 mlog_errno(status);
1220 goto bail;
1221 }
1222 if (status == 0)
1223 target_exists = 1;
1224
1225 if (!target_exists && new_inode) {
1226 /*
1227 * Target was unlinked by another node while we were
1228 * waiting to get to ocfs2_rename(). There isn't
1229 * anything we can do here to help the situation, so
1230 * bubble up the appropriate error.
1231 */
1232 status = -ENOENT;
1233 goto bail;
1234 }
1235
1236 /* In case we need to overwrite an existing file, we blow it
1237 * away first */
1238 if (target_exists) {
1239 /* VFS didn't think there existed an inode here, but
1240 * someone else in the cluster must have raced our
1241 * rename to create one. Today we error cleanly, in
1242 * the future we should consider calling iget to build
1243 * a new struct inode for this entry. */
1244 if (!new_inode) {
1245 status = -EACCES;
1246
1247 trace_ocfs2_rename_target_exists(new_dentry->d_name.len,
1248 new_dentry->d_name.name);
1249 goto bail;
1250 }
1251
1252 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1253 status = -EACCES;
1254
1255 trace_ocfs2_rename_disagree(
1256 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1257 (unsigned long long)newfe_blkno,
1258 OCFS2_I(new_inode)->ip_flags);
1259 goto bail;
1260 }
1261
1262 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1263 if (status < 0) {
1264 if (status != -ENOENT)
1265 mlog_errno(status);
1266 goto bail;
1267 }
1268 new_child_locked = 1;
1269
1270 status = ocfs2_remote_dentry_delete(new_dentry);
1271 if (status < 0) {
1272 mlog_errno(status);
1273 goto bail;
1274 }
1275
1276 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1277
1278 trace_ocfs2_rename_over_existing(
1279 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1280 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1281
1282 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1283 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1284 OCFS2_I(new_inode)->ip_blkno,
1285 orphan_name, &orphan_insert);
1286 if (status < 0) {
1287 mlog_errno(status);
1288 goto bail;
1289 }
1290 }
1291 } else {
1292 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1293
1294 status = ocfs2_check_dir_for_entry(new_dir,
1295 new_dentry->d_name.name,
1296 new_dentry->d_name.len);
1297 if (status)
1298 goto bail;
1299
1300 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1301 new_dentry->d_name.name,
1302 new_dentry->d_name.len,
1303 &target_insert);
1304 if (status < 0) {
1305 mlog_errno(status);
1306 goto bail;
1307 }
1308 }
1309
1310 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
1311 if (IS_ERR(handle)) {
1312 status = PTR_ERR(handle);
1313 handle = NULL;
1314 mlog_errno(status);
1315 goto bail;
1316 }
1317
1318 if (target_exists) {
1319 if (S_ISDIR(new_inode->i_mode)) {
1320 if (new_inode->i_nlink != 2 ||
1321 !ocfs2_empty_dir(new_inode)) {
1322 status = -ENOTEMPTY;
1323 goto bail;
1324 }
1325 }
1326 status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
1327 newfe_bh,
1328 OCFS2_JOURNAL_ACCESS_WRITE);
1329 if (status < 0) {
1330 mlog_errno(status);
1331 goto bail;
1332 }
1333
1334 if (S_ISDIR(new_inode->i_mode) ||
1335 (ocfs2_read_links_count(newfe) == 1)) {
1336 status = ocfs2_orphan_add(osb, handle, new_inode,
1337 newfe_bh, orphan_name,
1338 &orphan_insert, orphan_dir);
1339 if (status < 0) {
1340 mlog_errno(status);
1341 goto bail;
1342 }
1343 }
1344
1345 /* change the dirent to point to the correct inode */
1346 status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
1347 old_inode);
1348 if (status < 0) {
1349 mlog_errno(status);
1350 goto bail;
1351 }
1352 new_dir->i_version++;
1353
1354 if (S_ISDIR(new_inode->i_mode))
1355 ocfs2_set_links_count(newfe, 0);
1356 else
1357 ocfs2_add_links_count(newfe, -1);
1358 ocfs2_journal_dirty(handle, newfe_bh);
1359 } else {
1360 /* if the name was not found in new_dir, add it now */
1361 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1362 OCFS2_I(old_inode)->ip_blkno,
1363 new_dir_bh, &target_insert);
1364 }
1365
1366 old_inode->i_ctime = CURRENT_TIME;
1367 mark_inode_dirty(old_inode);
1368
1369 status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode),
1370 old_inode_bh,
1371 OCFS2_JOURNAL_ACCESS_WRITE);
1372 if (status >= 0) {
1373 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1374
1375 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1376 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1377 ocfs2_journal_dirty(handle, old_inode_bh);
1378 } else
1379 mlog_errno(status);
1380
1381 /*
1382 * Now that the name has been added to new_dir, remove the old name.
1383 *
1384 * We don't keep any directory entry context around until now
1385 * because the insert might have changed the type of directory
1386 * we're dealing with.
1387 */
1388 status = ocfs2_find_entry(old_dentry->d_name.name,
1389 old_dentry->d_name.len, old_dir,
1390 &old_entry_lookup);
1391 if (status)
1392 goto bail;
1393
1394 status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
1395 if (status < 0) {
1396 mlog_errno(status);
1397 goto bail;
1398 }
1399
1400 if (new_inode) {
1401 drop_nlink(new_inode);
1402 new_inode->i_ctime = CURRENT_TIME;
1403 }
1404 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1405
1406 if (update_dot_dot) {
1407 status = ocfs2_update_entry(old_inode, handle,
1408 &old_inode_dot_dot_res, new_dir);
1409 drop_nlink(old_dir);
1410 if (new_inode) {
1411 drop_nlink(new_inode);
1412 } else {
1413 inc_nlink(new_dir);
1414 mark_inode_dirty(new_dir);
1415 }
1416 }
1417 mark_inode_dirty(old_dir);
1418 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1419 if (new_inode) {
1420 mark_inode_dirty(new_inode);
1421 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1422 }
1423
1424 if (old_dir != new_dir) {
1425 /* Keep the same times on both directories.*/
1426 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1427
1428 /*
1429 * This will also pick up the i_nlink change from the
1430 * block above.
1431 */
1432 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1433 }
1434
1435 if (old_dir_nlink != old_dir->i_nlink) {
1436 if (!old_dir_bh) {
1437 mlog(ML_ERROR, "need to change nlink for old dir "
1438 "%llu from %d to %d but bh is NULL!\n",
1439 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1440 (int)old_dir_nlink, old_dir->i_nlink);
1441 } else {
1442 struct ocfs2_dinode *fe;
1443 status = ocfs2_journal_access_di(handle,
1444 INODE_CACHE(old_dir),
1445 old_dir_bh,
1446 OCFS2_JOURNAL_ACCESS_WRITE);
1447 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1448 ocfs2_set_links_count(fe, old_dir->i_nlink);
1449 ocfs2_journal_dirty(handle, old_dir_bh);
1450 }
1451 }
1452 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1453 status = 0;
1454 bail:
1455 if (rename_lock)
1456 ocfs2_rename_unlock(osb);
1457
1458 if (handle)
1459 ocfs2_commit_trans(osb, handle);
1460
1461 if (parents_locked)
1462 ocfs2_double_unlock(old_dir, new_dir);
1463
1464 if (old_child_locked)
1465 ocfs2_inode_unlock(old_inode, 1);
1466
1467 if (new_child_locked)
1468 ocfs2_inode_unlock(new_inode, 1);
1469
1470 if (orphan_dir) {
1471 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1472 ocfs2_inode_unlock(orphan_dir, 1);
1473 mutex_unlock(&orphan_dir->i_mutex);
1474 iput(orphan_dir);
1475 }
1476
1477 if (new_inode)
1478 sync_mapping_buffers(old_inode->i_mapping);
1479
1480 if (new_inode)
1481 iput(new_inode);
1482
1483 ocfs2_free_dir_lookup_result(&target_lookup_res);
1484 ocfs2_free_dir_lookup_result(&old_entry_lookup);
1485 ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
1486 ocfs2_free_dir_lookup_result(&orphan_insert);
1487 ocfs2_free_dir_lookup_result(&target_insert);
1488
1489 brelse(newfe_bh);
1490 brelse(old_inode_bh);
1491 brelse(old_dir_bh);
1492 brelse(new_dir_bh);
1493
1494 if (status)
1495 mlog_errno(status);
1496
1497 return status;
1498 }
1499
1500 /*
1501 * we expect i_size = strlen(symname). Copy symname into the file
1502 * data, including the null terminator.
1503 */
1504 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1505 handle_t *handle,
1506 struct inode *inode,
1507 const char *symname)
1508 {
1509 struct buffer_head **bhs = NULL;
1510 const char *c;
1511 struct super_block *sb = osb->sb;
1512 u64 p_blkno, p_blocks;
1513 int virtual, blocks, status, i, bytes_left;
1514
1515 bytes_left = i_size_read(inode) + 1;
1516 /* we can't trust i_blocks because we're actually going to
1517 * write i_size + 1 bytes. */
1518 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1519
1520 trace_ocfs2_create_symlink_data((unsigned long long)inode->i_blocks,
1521 i_size_read(inode), blocks);
1522
1523 /* Sanity check -- make sure we're going to fit. */
1524 if (bytes_left >
1525 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1526 status = -EIO;
1527 mlog_errno(status);
1528 goto bail;
1529 }
1530
1531 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1532 if (!bhs) {
1533 status = -ENOMEM;
1534 mlog_errno(status);
1535 goto bail;
1536 }
1537
1538 status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1539 NULL);
1540 if (status < 0) {
1541 mlog_errno(status);
1542 goto bail;
1543 }
1544
1545 /* links can never be larger than one cluster so we know this
1546 * is all going to be contiguous, but do a sanity check
1547 * anyway. */
1548 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1549 status = -EIO;
1550 mlog_errno(status);
1551 goto bail;
1552 }
1553
1554 virtual = 0;
1555 while(bytes_left > 0) {
1556 c = &symname[virtual * sb->s_blocksize];
1557
1558 bhs[virtual] = sb_getblk(sb, p_blkno);
1559 if (!bhs[virtual]) {
1560 status = -ENOMEM;
1561 mlog_errno(status);
1562 goto bail;
1563 }
1564 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode),
1565 bhs[virtual]);
1566
1567 status = ocfs2_journal_access(handle, INODE_CACHE(inode),
1568 bhs[virtual],
1569 OCFS2_JOURNAL_ACCESS_CREATE);
1570 if (status < 0) {
1571 mlog_errno(status);
1572 goto bail;
1573 }
1574
1575 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1576
1577 memcpy(bhs[virtual]->b_data, c,
1578 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1579 bytes_left);
1580
1581 ocfs2_journal_dirty(handle, bhs[virtual]);
1582
1583 virtual++;
1584 p_blkno++;
1585 bytes_left -= sb->s_blocksize;
1586 }
1587
1588 status = 0;
1589 bail:
1590
1591 if (bhs) {
1592 for(i = 0; i < blocks; i++)
1593 brelse(bhs[i]);
1594 kfree(bhs);
1595 }
1596
1597 if (status)
1598 mlog_errno(status);
1599 return status;
1600 }
1601
1602 static int ocfs2_symlink(struct inode *dir,
1603 struct dentry *dentry,
1604 const char *symname)
1605 {
1606 int status, l, credits;
1607 u64 newsize;
1608 struct ocfs2_super *osb = NULL;
1609 struct inode *inode = NULL;
1610 struct super_block *sb;
1611 struct buffer_head *new_fe_bh = NULL;
1612 struct buffer_head *parent_fe_bh = NULL;
1613 struct ocfs2_dinode *fe = NULL;
1614 struct ocfs2_dinode *dirfe;
1615 handle_t *handle = NULL;
1616 struct ocfs2_alloc_context *inode_ac = NULL;
1617 struct ocfs2_alloc_context *data_ac = NULL;
1618 struct ocfs2_alloc_context *xattr_ac = NULL;
1619 int want_clusters = 0;
1620 int xattr_credits = 0;
1621 struct ocfs2_security_xattr_info si = {
1622 .enable = 1,
1623 };
1624 int did_quota = 0, did_quota_inode = 0;
1625 struct ocfs2_dir_lookup_result lookup = { NULL, };
1626 sigset_t oldset;
1627 int did_block_signals = 0;
1628
1629 trace_ocfs2_symlink_begin(dir, dentry, symname,
1630 dentry->d_name.len, dentry->d_name.name);
1631
1632 dquot_initialize(dir);
1633
1634 sb = dir->i_sb;
1635 osb = OCFS2_SB(sb);
1636
1637 l = strlen(symname) + 1;
1638
1639 credits = ocfs2_calc_symlink_credits(sb);
1640
1641 /* lock the parent directory */
1642 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1643 if (status < 0) {
1644 if (status != -ENOENT)
1645 mlog_errno(status);
1646 return status;
1647 }
1648
1649 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1650 if (!ocfs2_read_links_count(dirfe)) {
1651 /* can't make a file in a deleted directory. */
1652 status = -ENOENT;
1653 goto bail;
1654 }
1655
1656 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1657 dentry->d_name.len);
1658 if (status)
1659 goto bail;
1660
1661 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1662 dentry->d_name.name,
1663 dentry->d_name.len, &lookup);
1664 if (status < 0) {
1665 mlog_errno(status);
1666 goto bail;
1667 }
1668
1669 status = ocfs2_reserve_new_inode(osb, &inode_ac);
1670 if (status < 0) {
1671 if (status != -ENOSPC)
1672 mlog_errno(status);
1673 goto bail;
1674 }
1675
1676 inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
1677 if (!inode) {
1678 status = -ENOMEM;
1679 mlog_errno(status);
1680 goto bail;
1681 }
1682
1683 /* get security xattr */
1684 status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
1685 if (status) {
1686 if (status == -EOPNOTSUPP)
1687 si.enable = 0;
1688 else {
1689 mlog_errno(status);
1690 goto bail;
1691 }
1692 }
1693
1694 /* calculate meta data/clusters for setting security xattr */
1695 if (si.enable) {
1696 status = ocfs2_calc_security_init(dir, &si, &want_clusters,
1697 &xattr_credits, &xattr_ac);
1698 if (status < 0) {
1699 mlog_errno(status);
1700 goto bail;
1701 }
1702 }
1703
1704 /* don't reserve bitmap space for fast symlinks. */
1705 if (l > ocfs2_fast_symlink_chars(sb))
1706 want_clusters += 1;
1707
1708 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
1709 if (status < 0) {
1710 if (status != -ENOSPC)
1711 mlog_errno(status);
1712 goto bail;
1713 }
1714
1715 handle = ocfs2_start_trans(osb, credits + xattr_credits);
1716 if (IS_ERR(handle)) {
1717 status = PTR_ERR(handle);
1718 handle = NULL;
1719 mlog_errno(status);
1720 goto bail;
1721 }
1722
1723 /* Starting to change things, restart is no longer possible. */
1724 ocfs2_block_signals(&oldset);
1725 did_block_signals = 1;
1726
1727 status = dquot_alloc_inode(inode);
1728 if (status)
1729 goto bail;
1730 did_quota_inode = 1;
1731
1732 trace_ocfs2_symlink_create(dir, dentry, dentry->d_name.len,
1733 dentry->d_name.name,
1734 (unsigned long long)OCFS2_I(dir)->ip_blkno,
1735 inode->i_mode);
1736
1737 status = ocfs2_mknod_locked(osb, dir, inode,
1738 0, &new_fe_bh, parent_fe_bh, handle,
1739 inode_ac);
1740 if (status < 0) {
1741 mlog_errno(status);
1742 goto bail;
1743 }
1744
1745 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1746 inode->i_rdev = 0;
1747 newsize = l - 1;
1748 inode->i_op = &ocfs2_symlink_inode_operations;
1749 if (l > ocfs2_fast_symlink_chars(sb)) {
1750 u32 offset = 0;
1751
1752 status = dquot_alloc_space_nodirty(inode,
1753 ocfs2_clusters_to_bytes(osb->sb, 1));
1754 if (status)
1755 goto bail;
1756 did_quota = 1;
1757 inode->i_mapping->a_ops = &ocfs2_aops;
1758 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
1759 new_fe_bh,
1760 handle, data_ac, NULL,
1761 NULL);
1762 if (status < 0) {
1763 if (status != -ENOSPC && status != -EINTR) {
1764 mlog(ML_ERROR,
1765 "Failed to extend file to %llu\n",
1766 (unsigned long long)newsize);
1767 mlog_errno(status);
1768 status = -ENOSPC;
1769 }
1770 goto bail;
1771 }
1772 i_size_write(inode, newsize);
1773 inode->i_blocks = ocfs2_inode_sector_count(inode);
1774 } else {
1775 inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
1776 memcpy((char *) fe->id2.i_symlink, symname, l);
1777 i_size_write(inode, newsize);
1778 inode->i_blocks = 0;
1779 }
1780
1781 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1782 if (status < 0) {
1783 mlog_errno(status);
1784 goto bail;
1785 }
1786
1787 if (!ocfs2_inode_is_fast_symlink(inode)) {
1788 status = ocfs2_create_symlink_data(osb, handle, inode,
1789 symname);
1790 if (status < 0) {
1791 mlog_errno(status);
1792 goto bail;
1793 }
1794 }
1795
1796 if (si.enable) {
1797 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
1798 xattr_ac, data_ac);
1799 if (status < 0) {
1800 mlog_errno(status);
1801 goto bail;
1802 }
1803 }
1804
1805 /*
1806 * Do this before adding the entry to the directory. We add
1807 * also set d_op after success so that ->d_iput() will cleanup
1808 * the dentry lock even if ocfs2_add_entry() fails below.
1809 */
1810 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1811 if (status) {
1812 mlog_errno(status);
1813 goto bail;
1814 }
1815
1816 status = ocfs2_add_entry(handle, dentry, inode,
1817 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1818 &lookup);
1819 if (status < 0) {
1820 mlog_errno(status);
1821 goto bail;
1822 }
1823
1824 insert_inode_hash(inode);
1825 d_instantiate(dentry, inode);
1826 bail:
1827 if (status < 0 && did_quota)
1828 dquot_free_space_nodirty(inode,
1829 ocfs2_clusters_to_bytes(osb->sb, 1));
1830 if (status < 0 && did_quota_inode)
1831 dquot_free_inode(inode);
1832 if (handle)
1833 ocfs2_commit_trans(osb, handle);
1834
1835 ocfs2_inode_unlock(dir, 1);
1836 if (did_block_signals)
1837 ocfs2_unblock_signals(&oldset);
1838
1839 brelse(new_fe_bh);
1840 brelse(parent_fe_bh);
1841 kfree(si.name);
1842 kfree(si.value);
1843 ocfs2_free_dir_lookup_result(&lookup);
1844 if (inode_ac)
1845 ocfs2_free_alloc_context(inode_ac);
1846 if (data_ac)
1847 ocfs2_free_alloc_context(data_ac);
1848 if (xattr_ac)
1849 ocfs2_free_alloc_context(xattr_ac);
1850 if ((status < 0) && inode) {
1851 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
1852 clear_nlink(inode);
1853 iput(inode);
1854 }
1855
1856 if (status)
1857 mlog_errno(status);
1858
1859 return status;
1860 }
1861
1862 static int ocfs2_blkno_stringify(u64 blkno, char *name)
1863 {
1864 int status, namelen;
1865
1866 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1867 (long long)blkno);
1868 if (namelen <= 0) {
1869 if (namelen)
1870 status = namelen;
1871 else
1872 status = -EINVAL;
1873 mlog_errno(status);
1874 goto bail;
1875 }
1876 if (namelen != OCFS2_ORPHAN_NAMELEN) {
1877 status = -EINVAL;
1878 mlog_errno(status);
1879 goto bail;
1880 }
1881
1882 trace_ocfs2_blkno_stringify(blkno, name, namelen);
1883
1884 status = 0;
1885 bail:
1886 if (status < 0)
1887 mlog_errno(status);
1888 return status;
1889 }
1890
1891 static int ocfs2_lookup_lock_orphan_dir(struct ocfs2_super *osb,
1892 struct inode **ret_orphan_dir,
1893 struct buffer_head **ret_orphan_dir_bh)
1894 {
1895 struct inode *orphan_dir_inode;
1896 struct buffer_head *orphan_dir_bh = NULL;
1897 int ret = 0;
1898
1899 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
1900 ORPHAN_DIR_SYSTEM_INODE,
1901 osb->slot_num);
1902 if (!orphan_dir_inode) {
1903 ret = -ENOENT;
1904 mlog_errno(ret);
1905 return ret;
1906 }
1907
1908 mutex_lock(&orphan_dir_inode->i_mutex);
1909
1910 ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
1911 if (ret < 0) {
1912 mutex_unlock(&orphan_dir_inode->i_mutex);
1913 iput(orphan_dir_inode);
1914
1915 mlog_errno(ret);
1916 return ret;
1917 }
1918
1919 *ret_orphan_dir = orphan_dir_inode;
1920 *ret_orphan_dir_bh = orphan_dir_bh;
1921
1922 return 0;
1923 }
1924
1925 static int __ocfs2_prepare_orphan_dir(struct inode *orphan_dir_inode,
1926 struct buffer_head *orphan_dir_bh,
1927 u64 blkno,
1928 char *name,
1929 struct ocfs2_dir_lookup_result *lookup)
1930 {
1931 int ret;
1932 struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);
1933
1934 ret = ocfs2_blkno_stringify(blkno, name);
1935 if (ret < 0) {
1936 mlog_errno(ret);
1937 return ret;
1938 }
1939
1940 ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
1941 orphan_dir_bh, name,
1942 OCFS2_ORPHAN_NAMELEN, lookup);
1943 if (ret < 0) {
1944 mlog_errno(ret);
1945 return ret;
1946 }
1947
1948 return 0;
1949 }
1950
1951 /**
1952 * ocfs2_prepare_orphan_dir() - Prepare an orphan directory for
1953 * insertion of an orphan.
1954 * @osb: ocfs2 file system
1955 * @ret_orphan_dir: Orphan dir inode - returned locked!
1956 * @blkno: Actual block number of the inode to be inserted into orphan dir.
1957 * @lookup: dir lookup result, to be passed back into functions like
1958 * ocfs2_orphan_add
1959 *
1960 * Returns zero on success and the ret_orphan_dir, name and lookup
1961 * fields will be populated.
1962 *
1963 * Returns non-zero on failure.
1964 */
1965 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
1966 struct inode **ret_orphan_dir,
1967 u64 blkno,
1968 char *name,
1969 struct ocfs2_dir_lookup_result *lookup)
1970 {
1971 struct inode *orphan_dir_inode = NULL;
1972 struct buffer_head *orphan_dir_bh = NULL;
1973 int ret = 0;
1974
1975 ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode,
1976 &orphan_dir_bh);
1977 if (ret < 0) {
1978 mlog_errno(ret);
1979 return ret;
1980 }
1981
1982 ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh,
1983 blkno, name, lookup);
1984 if (ret < 0) {
1985 mlog_errno(ret);
1986 goto out;
1987 }
1988
1989 *ret_orphan_dir = orphan_dir_inode;
1990
1991 out:
1992 brelse(orphan_dir_bh);
1993
1994 if (ret) {
1995 ocfs2_inode_unlock(orphan_dir_inode, 1);
1996 mutex_unlock(&orphan_dir_inode->i_mutex);
1997 iput(orphan_dir_inode);
1998 }
1999
2000 if (ret)
2001 mlog_errno(ret);
2002 return ret;
2003 }
2004
2005 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2006 handle_t *handle,
2007 struct inode *inode,
2008 struct buffer_head *fe_bh,
2009 char *name,
2010 struct ocfs2_dir_lookup_result *lookup,
2011 struct inode *orphan_dir_inode)
2012 {
2013 struct buffer_head *orphan_dir_bh = NULL;
2014 int status = 0;
2015 struct ocfs2_dinode *orphan_fe;
2016 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
2017
2018 trace_ocfs2_orphan_add_begin(
2019 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2020
2021 status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
2022 if (status < 0) {
2023 mlog_errno(status);
2024 goto leave;
2025 }
2026
2027 status = ocfs2_journal_access_di(handle,
2028 INODE_CACHE(orphan_dir_inode),
2029 orphan_dir_bh,
2030 OCFS2_JOURNAL_ACCESS_WRITE);
2031 if (status < 0) {
2032 mlog_errno(status);
2033 goto leave;
2034 }
2035
2036 /*
2037 * We're going to journal the change of i_flags and i_orphaned_slot.
2038 * It's safe anyway, though some callers may duplicate the journaling.
2039 * Journaling within the func just make the logic look more
2040 * straightforward.
2041 */
2042 status = ocfs2_journal_access_di(handle,
2043 INODE_CACHE(inode),
2044 fe_bh,
2045 OCFS2_JOURNAL_ACCESS_WRITE);
2046 if (status < 0) {
2047 mlog_errno(status);
2048 goto leave;
2049 }
2050
2051 /* we're a cluster, and nlink can change on disk from
2052 * underneath us... */
2053 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2054 if (S_ISDIR(inode->i_mode))
2055 ocfs2_add_links_count(orphan_fe, 1);
2056 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2057 ocfs2_journal_dirty(handle, orphan_dir_bh);
2058
2059 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2060 OCFS2_ORPHAN_NAMELEN, inode,
2061 OCFS2_I(inode)->ip_blkno,
2062 orphan_dir_bh, lookup);
2063 if (status < 0) {
2064 mlog_errno(status);
2065 goto rollback;
2066 }
2067
2068 fe->i_flags |= cpu_to_le32(OCFS2_ORPHANED_FL);
2069 OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR;
2070
2071 /* Record which orphan dir our inode now resides
2072 * in. delete_inode will use this to determine which orphan
2073 * dir to lock. */
2074 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
2075
2076 ocfs2_journal_dirty(handle, fe_bh);
2077
2078 trace_ocfs2_orphan_add_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
2079 osb->slot_num);
2080
2081 rollback:
2082 if (status < 0) {
2083 if (S_ISDIR(inode->i_mode))
2084 ocfs2_add_links_count(orphan_fe, -1);
2085 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2086 }
2087
2088 leave:
2089 brelse(orphan_dir_bh);
2090
2091 return status;
2092 }
2093
2094 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2095 int ocfs2_orphan_del(struct ocfs2_super *osb,
2096 handle_t *handle,
2097 struct inode *orphan_dir_inode,
2098 struct inode *inode,
2099 struct buffer_head *orphan_dir_bh)
2100 {
2101 char name[OCFS2_ORPHAN_NAMELEN + 1];
2102 struct ocfs2_dinode *orphan_fe;
2103 int status = 0;
2104 struct ocfs2_dir_lookup_result lookup = { NULL, };
2105
2106 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2107 if (status < 0) {
2108 mlog_errno(status);
2109 goto leave;
2110 }
2111
2112 trace_ocfs2_orphan_del(
2113 (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2114 name, OCFS2_ORPHAN_NAMELEN);
2115
2116 /* find it's spot in the orphan directory */
2117 status = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, orphan_dir_inode,
2118 &lookup);
2119 if (status) {
2120 mlog_errno(status);
2121 goto leave;
2122 }
2123
2124 /* remove it from the orphan directory */
2125 status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup);
2126 if (status < 0) {
2127 mlog_errno(status);
2128 goto leave;
2129 }
2130
2131 status = ocfs2_journal_access_di(handle,
2132 INODE_CACHE(orphan_dir_inode),
2133 orphan_dir_bh,
2134 OCFS2_JOURNAL_ACCESS_WRITE);
2135 if (status < 0) {
2136 mlog_errno(status);
2137 goto leave;
2138 }
2139
2140 /* do the i_nlink dance! :) */
2141 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2142 if (S_ISDIR(inode->i_mode))
2143 ocfs2_add_links_count(orphan_fe, -1);
2144 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2145 ocfs2_journal_dirty(handle, orphan_dir_bh);
2146
2147 leave:
2148 ocfs2_free_dir_lookup_result(&lookup);
2149
2150 if (status)
2151 mlog_errno(status);
2152 return status;
2153 }
2154
2155 /**
2156 * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to receive a newly
2157 * allocated file. This is different from the typical 'add to orphan dir'
2158 * operation in that the inode does not yet exist. This is a problem because
2159 * the orphan dir stringifies the inode block number to come up with it's
2160 * dirent. Obviously if the inode does not yet exist we have a chicken and egg
2161 * problem. This function works around it by calling deeper into the orphan
2162 * and suballoc code than other callers. Use this only by necessity.
2163 * @dir: The directory which this inode will ultimately wind up under - not the
2164 * orphan dir!
2165 * @dir_bh: buffer_head the @dir inode block
2166 * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled
2167 * with the string to be used for orphan dirent. Pass back to the orphan dir
2168 * code.
2169 * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan
2170 * dir code.
2171 * @ret_di_blkno: block number where the new inode will be allocated.
2172 * @orphan_insert: Dir insert context to be passed back into orphan dir code.
2173 * @ret_inode_ac: Inode alloc context to be passed back to the allocator.
2174 *
2175 * Returns zero on success and the ret_orphan_dir, name and lookup
2176 * fields will be populated.
2177 *
2178 * Returns non-zero on failure.
2179 */
2180 static int ocfs2_prep_new_orphaned_file(struct inode *dir,
2181 struct buffer_head *dir_bh,
2182 char *orphan_name,
2183 struct inode **ret_orphan_dir,
2184 u64 *ret_di_blkno,
2185 struct ocfs2_dir_lookup_result *orphan_insert,
2186 struct ocfs2_alloc_context **ret_inode_ac)
2187 {
2188 int ret;
2189 u64 di_blkno;
2190 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2191 struct inode *orphan_dir = NULL;
2192 struct buffer_head *orphan_dir_bh = NULL;
2193 struct ocfs2_alloc_context *inode_ac = NULL;
2194
2195 ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh);
2196 if (ret < 0) {
2197 mlog_errno(ret);
2198 return ret;
2199 }
2200
2201 /* reserve an inode spot */
2202 ret = ocfs2_reserve_new_inode(osb, &inode_ac);
2203 if (ret < 0) {
2204 if (ret != -ENOSPC)
2205 mlog_errno(ret);
2206 goto out;
2207 }
2208
2209 ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
2210 &di_blkno);
2211 if (ret) {
2212 mlog_errno(ret);
2213 goto out;
2214 }
2215
2216 ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
2217 di_blkno, orphan_name, orphan_insert);
2218 if (ret < 0) {
2219 mlog_errno(ret);
2220 goto out;
2221 }
2222
2223 out:
2224 if (ret == 0) {
2225 *ret_orphan_dir = orphan_dir;
2226 *ret_di_blkno = di_blkno;
2227 *ret_inode_ac = inode_ac;
2228 /*
2229 * orphan_name and orphan_insert are already up to
2230 * date via prepare_orphan_dir
2231 */
2232 } else {
2233 /* Unroll reserve_new_inode* */
2234 if (inode_ac)
2235 ocfs2_free_alloc_context(inode_ac);
2236
2237 /* Unroll orphan dir locking */
2238 mutex_unlock(&orphan_dir->i_mutex);
2239 ocfs2_inode_unlock(orphan_dir, 1);
2240 iput(orphan_dir);
2241 }
2242
2243 brelse(orphan_dir_bh);
2244
2245 return ret;
2246 }
2247
2248 int ocfs2_create_inode_in_orphan(struct inode *dir,
2249 int mode,
2250 struct inode **new_inode)
2251 {
2252 int status, did_quota_inode = 0;
2253 struct inode *inode = NULL;
2254 struct inode *orphan_dir = NULL;
2255 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2256 struct ocfs2_dinode *di = NULL;
2257 handle_t *handle = NULL;
2258 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
2259 struct buffer_head *parent_di_bh = NULL;
2260 struct buffer_head *new_di_bh = NULL;
2261 struct ocfs2_alloc_context *inode_ac = NULL;
2262 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2263 u64 uninitialized_var(di_blkno), suballoc_loc;
2264 u16 suballoc_bit;
2265
2266 status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2267 if (status < 0) {
2268 if (status != -ENOENT)
2269 mlog_errno(status);
2270 return status;
2271 }
2272
2273 status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
2274 orphan_name, &orphan_dir,
2275 &di_blkno, &orphan_insert, &inode_ac);
2276 if (status < 0) {
2277 if (status != -ENOSPC)
2278 mlog_errno(status);
2279 goto leave;
2280 }
2281
2282 inode = ocfs2_get_init_inode(dir, mode);
2283 if (!inode) {
2284 status = -ENOMEM;
2285 mlog_errno(status);
2286 goto leave;
2287 }
2288
2289 handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
2290 if (IS_ERR(handle)) {
2291 status = PTR_ERR(handle);
2292 handle = NULL;
2293 mlog_errno(status);
2294 goto leave;
2295 }
2296
2297 status = dquot_alloc_inode(inode);
2298 if (status)
2299 goto leave;
2300 did_quota_inode = 1;
2301
2302 status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
2303 &suballoc_loc,
2304 &suballoc_bit, di_blkno);
2305 if (status < 0) {
2306 mlog_errno(status);
2307 goto leave;
2308 }
2309
2310 clear_nlink(inode);
2311 /* do the real work now. */
2312 status = __ocfs2_mknod_locked(dir, inode,
2313 0, &new_di_bh, parent_di_bh, handle,
2314 inode_ac, di_blkno, suballoc_loc,
2315 suballoc_bit);
2316 if (status < 0) {
2317 mlog_errno(status);
2318 goto leave;
2319 }
2320
2321 di = (struct ocfs2_dinode *)new_di_bh->b_data;
2322 status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
2323 &orphan_insert, orphan_dir);
2324 if (status < 0) {
2325 mlog_errno(status);
2326 goto leave;
2327 }
2328
2329 /* get open lock so that only nodes can't remove it from orphan dir. */
2330 status = ocfs2_open_lock(inode);
2331 if (status < 0)
2332 mlog_errno(status);
2333
2334 insert_inode_hash(inode);
2335 leave:
2336 if (status < 0 && did_quota_inode)
2337 dquot_free_inode(inode);
2338 if (handle)
2339 ocfs2_commit_trans(osb, handle);
2340
2341 if (orphan_dir) {
2342 /* This was locked for us in ocfs2_prepare_orphan_dir() */
2343 ocfs2_inode_unlock(orphan_dir, 1);
2344 mutex_unlock(&orphan_dir->i_mutex);
2345 iput(orphan_dir);
2346 }
2347
2348 if ((status < 0) && inode) {
2349 clear_nlink(inode);
2350 iput(inode);
2351 }
2352
2353 if (inode_ac)
2354 ocfs2_free_alloc_context(inode_ac);
2355
2356 brelse(new_di_bh);
2357
2358 if (!status)
2359 *new_inode = inode;
2360
2361 ocfs2_free_dir_lookup_result(&orphan_insert);
2362
2363 ocfs2_inode_unlock(dir, 1);
2364 brelse(parent_di_bh);
2365 return status;
2366 }
2367
2368 int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
2369 struct inode *inode,
2370 struct dentry *dentry)
2371 {
2372 int status = 0;
2373 struct buffer_head *parent_di_bh = NULL;
2374 handle_t *handle = NULL;
2375 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2376 struct ocfs2_dinode *dir_di, *di;
2377 struct inode *orphan_dir_inode = NULL;
2378 struct buffer_head *orphan_dir_bh = NULL;
2379 struct buffer_head *di_bh = NULL;
2380 struct ocfs2_dir_lookup_result lookup = { NULL, };
2381
2382 trace_ocfs2_mv_orphaned_inode_to_new(dir, dentry,
2383 dentry->d_name.len, dentry->d_name.name,
2384 (unsigned long long)OCFS2_I(dir)->ip_blkno,
2385 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2386
2387 status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2388 if (status < 0) {
2389 if (status != -ENOENT)
2390 mlog_errno(status);
2391 return status;
2392 }
2393
2394 dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
2395 if (!dir_di->i_links_count) {
2396 /* can't make a file in a deleted directory. */
2397 status = -ENOENT;
2398 goto leave;
2399 }
2400
2401 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
2402 dentry->d_name.len);
2403 if (status)
2404 goto leave;
2405
2406 /* get a spot inside the dir. */
2407 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_di_bh,
2408 dentry->d_name.name,
2409 dentry->d_name.len, &lookup);
2410 if (status < 0) {
2411 mlog_errno(status);
2412 goto leave;
2413 }
2414
2415 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2416 ORPHAN_DIR_SYSTEM_INODE,
2417 osb->slot_num);
2418 if (!orphan_dir_inode) {
2419 status = -EEXIST;
2420 mlog_errno(status);
2421 goto leave;
2422 }
2423
2424 mutex_lock(&orphan_dir_inode->i_mutex);
2425
2426 status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2427 if (status < 0) {
2428 mlog_errno(status);
2429 mutex_unlock(&orphan_dir_inode->i_mutex);
2430 iput(orphan_dir_inode);
2431 goto leave;
2432 }
2433
2434 status = ocfs2_read_inode_block(inode, &di_bh);
2435 if (status < 0) {
2436 mlog_errno(status);
2437 goto orphan_unlock;
2438 }
2439
2440 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
2441 if (IS_ERR(handle)) {
2442 status = PTR_ERR(handle);
2443 handle = NULL;
2444 mlog_errno(status);
2445 goto orphan_unlock;
2446 }
2447
2448 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
2449 di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2450 if (status < 0) {
2451 mlog_errno(status);
2452 goto out_commit;
2453 }
2454
2455 status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
2456 orphan_dir_bh);
2457 if (status < 0) {
2458 mlog_errno(status);
2459 goto out_commit;
2460 }
2461
2462 di = (struct ocfs2_dinode *)di_bh->b_data;
2463 di->i_flags &= ~cpu_to_le32(OCFS2_ORPHANED_FL);
2464 di->i_orphaned_slot = 0;
2465 set_nlink(inode, 1);
2466 ocfs2_set_links_count(di, inode->i_nlink);
2467 ocfs2_journal_dirty(handle, di_bh);
2468
2469 status = ocfs2_add_entry(handle, dentry, inode,
2470 OCFS2_I(inode)->ip_blkno, parent_di_bh,
2471 &lookup);
2472 if (status < 0) {
2473 mlog_errno(status);
2474 goto out_commit;
2475 }
2476
2477 status = ocfs2_dentry_attach_lock(dentry, inode,
2478 OCFS2_I(dir)->ip_blkno);
2479 if (status) {
2480 mlog_errno(status);
2481 goto out_commit;
2482 }
2483
2484 d_instantiate(dentry, inode);
2485 status = 0;
2486 out_commit:
2487 ocfs2_commit_trans(osb, handle);
2488 orphan_unlock:
2489 ocfs2_inode_unlock(orphan_dir_inode, 1);
2490 mutex_unlock(&orphan_dir_inode->i_mutex);
2491 iput(orphan_dir_inode);
2492 leave:
2493
2494 ocfs2_inode_unlock(dir, 1);
2495
2496 brelse(di_bh);
2497 brelse(parent_di_bh);
2498 brelse(orphan_dir_bh);
2499
2500 ocfs2_free_dir_lookup_result(&lookup);
2501
2502 if (status)
2503 mlog_errno(status);
2504
2505 return status;
2506 }
2507
2508 const struct inode_operations ocfs2_dir_iops = {
2509 .create = ocfs2_create,
2510 .lookup = ocfs2_lookup,
2511 .link = ocfs2_link,
2512 .unlink = ocfs2_unlink,
2513 .rmdir = ocfs2_unlink,
2514 .symlink = ocfs2_symlink,
2515 .mkdir = ocfs2_mkdir,
2516 .mknod = ocfs2_mknod,
2517 .rename = ocfs2_rename,
2518 .setattr = ocfs2_setattr,
2519 .getattr = ocfs2_getattr,
2520 .permission = ocfs2_permission,
2521 .setxattr = generic_setxattr,
2522 .getxattr = generic_getxattr,
2523 .listxattr = ocfs2_listxattr,
2524 .removexattr = generic_removexattr,
2525 .fiemap = ocfs2_fiemap,
2526 .get_acl = ocfs2_iop_get_acl,
2527 .set_acl = ocfs2_iop_set_acl,
2528 };
(deprecated) Btrfs devel tree