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Merge remote-tracking branch 'slab/for-next'
[linux-2.6/next.git] / fs / ocfs2 / namei.c
blob53aa41ed7bf39d34d2ad9064813b3e6feeb57971
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * namei.c
5 *
6 * Create and rename file, directory, symlinks
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * Portions of this code from linux/fs/ext3/dir.c
11 *
12 * Copyright (C) 1992, 1993, 1994, 1995
13 * Remy Card (card@masi.ibp.fr)
14 * Laboratoire MASI - Institut Blaise pascal
15 * Universite Pierre et Marie Curie (Paris VI)
16 *
17 * from
18 *
19 * linux/fs/minix/dir.c
20 *
21 * Copyright (C) 1991, 1992 Linux Torvalds
22 *
23 * This program is free software; you can redistribute it and/or
24 * modify it under the terms of the GNU General Public
25 * License as published by the Free Software Foundation; either
26 * version 2 of the License, or (at your option) any later version.
27 *
28 * This program is distributed in the hope that it will be useful,
29 * but WITHOUT ANY WARRANTY; without even the implied warranty of
30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
31 * General Public License for more details.
32 *
33 * You should have received a copy of the GNU General Public
34 * License along with this program; if not, write to the
35 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
36 * Boston, MA 021110-1307, USA.
37 */
38
39 #include <linux/fs.h>
40 #include <linux/types.h>
41 #include <linux/slab.h>
42 #include <linux/highmem.h>
43 #include <linux/quotaops.h>
44
45 #include <cluster/masklog.h>
46
47 #include "ocfs2.h"
48
49 #include "alloc.h"
50 #include "dcache.h"
51 #include "dir.h"
52 #include "dlmglue.h"
53 #include "extent_map.h"
54 #include "file.h"
55 #include "inode.h"
56 #include "journal.h"
57 #include "namei.h"
58 #include "suballoc.h"
59 #include "super.h"
60 #include "symlink.h"
61 #include "sysfile.h"
62 #include "uptodate.h"
63 #include "xattr.h"
64 #include "acl.h"
65 #include "ocfs2_trace.h"
66
67 #include "buffer_head_io.h"
68
69 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
70 struct inode *dir,
71 struct inode *inode,
72 dev_t dev,
73 struct buffer_head **new_fe_bh,
74 struct buffer_head *parent_fe_bh,
75 handle_t *handle,
76 struct ocfs2_alloc_context *inode_ac);
77
78 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
79 struct inode **ret_orphan_dir,
80 u64 blkno,
81 char *name,
82 struct ocfs2_dir_lookup_result *lookup);
83
84 static int ocfs2_orphan_add(struct ocfs2_super *osb,
85 handle_t *handle,
86 struct inode *inode,
87 struct buffer_head *fe_bh,
88 char *name,
89 struct ocfs2_dir_lookup_result *lookup,
90 struct inode *orphan_dir_inode);
91
92 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
93 handle_t *handle,
94 struct inode *inode,
95 const char *symname);
96
97 /* An orphan dir name is an 8 byte value, printed as a hex string */
98 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
99
100 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
101 struct nameidata *nd)
102 {
103 int status;
104 u64 blkno;
105 struct inode *inode = NULL;
106 struct dentry *ret;
107 struct ocfs2_inode_info *oi;
108
109 trace_ocfs2_lookup(dir, dentry, dentry->d_name.len,
110 dentry->d_name.name,
111 (unsigned long long)OCFS2_I(dir)->ip_blkno, 0);
112
113 if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
114 ret = ERR_PTR(-ENAMETOOLONG);
115 goto bail;
116 }
117
118 status = ocfs2_inode_lock_nested(dir, NULL, 0, OI_LS_PARENT);
119 if (status < 0) {
120 if (status != -ENOENT)
121 mlog_errno(status);
122 ret = ERR_PTR(status);
123 goto bail;
124 }
125
126 status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
127 dentry->d_name.len, &blkno);
128 if (status < 0)
129 goto bail_add;
130
131 inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
132 if (IS_ERR(inode)) {
133 ret = ERR_PTR(-EACCES);
134 goto bail_unlock;
135 }
136
137 oi = OCFS2_I(inode);
138 /* Clear any orphaned state... If we were able to look up the
139 * inode from a directory, it certainly can't be orphaned. We
140 * might have the bad state from a node which intended to
141 * orphan this inode but crashed before it could commit the
142 * unlink. */
143 spin_lock(&oi->ip_lock);
144 oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
145 spin_unlock(&oi->ip_lock);
146
147 bail_add:
148 ret = d_splice_alias(inode, dentry);
149
150 if (inode) {
151 /*
152 * If d_splice_alias() finds a DCACHE_DISCONNECTED
153 * dentry, it will d_move() it on top of ourse. The
154 * return value will indicate this however, so in
155 * those cases, we switch them around for the locking
156 * code.
157 *
158 * NOTE: This dentry already has ->d_op set from
159 * ocfs2_get_parent() and ocfs2_get_dentry()
160 */
161 if (ret)
162 dentry = ret;
163
164 status = ocfs2_dentry_attach_lock(dentry, inode,
165 OCFS2_I(dir)->ip_blkno);
166 if (status) {
167 mlog_errno(status);
168 ret = ERR_PTR(status);
169 goto bail_unlock;
170 }
171 } else
172 ocfs2_dentry_attach_gen(dentry);
173
174 bail_unlock:
175 /* Don't drop the cluster lock until *after* the d_add --
176 * unlink on another node will message us to remove that
177 * dentry under this lock so otherwise we can race this with
178 * the downconvert thread and have a stale dentry. */
179 ocfs2_inode_unlock(dir, 0);
180
181 bail:
182
183 trace_ocfs2_lookup_ret(ret);
184
185 return ret;
186 }
187
188 static struct inode *ocfs2_get_init_inode(struct inode *dir, int 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 inode->i_nlink = 2;
203 else
204 inode->i_nlink = 1;
205 inode_init_owner(inode, dir, mode);
206 dquot_initialize(inode);
207 return inode;
208 }
209
210 static int ocfs2_mknod(struct inode *dir,
211 struct dentry *dentry,
212 int mode,
213 dev_t dev)
214 {
215 int status = 0;
216 struct buffer_head *parent_fe_bh = NULL;
217 handle_t *handle = NULL;
218 struct ocfs2_super *osb;
219 struct ocfs2_dinode *dirfe;
220 struct buffer_head *new_fe_bh = NULL;
221 struct inode *inode = NULL;
222 struct ocfs2_alloc_context *inode_ac = NULL;
223 struct ocfs2_alloc_context *data_ac = NULL;
224 struct ocfs2_alloc_context *meta_ac = NULL;
225 int want_clusters = 0;
226 int want_meta = 0;
227 int xattr_credits = 0;
228 struct ocfs2_security_xattr_info si = {
229 .enable = 1,
230 };
231 int did_quota_inode = 0;
232 struct ocfs2_dir_lookup_result lookup = { NULL, };
233 sigset_t oldset;
234 int did_block_signals = 0;
235
236 trace_ocfs2_mknod(dir, dentry, dentry->d_name.len, dentry->d_name.name,
237 (unsigned long long)OCFS2_I(dir)->ip_blkno,
238 (unsigned long)dev, mode);
239
240 dquot_initialize(dir);
241
242 /* get our super block */
243 osb = OCFS2_SB(dir->i_sb);
244
245 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
246 if (status < 0) {
247 if (status != -ENOENT)
248 mlog_errno(status);
249 return status;
250 }
251
252 if (S_ISDIR(mode) && (dir->i_nlink >= ocfs2_link_max(osb))) {
253 status = -EMLINK;
254 goto leave;
255 }
256
257 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
258 if (!ocfs2_read_links_count(dirfe)) {
259 /* can't make a file in a deleted directory. */
260 status = -ENOENT;
261 goto leave;
262 }
263
264 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
265 dentry->d_name.len);
266 if (status)
267 goto leave;
268
269 /* get a spot inside the dir. */
270 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
271 dentry->d_name.name,
272 dentry->d_name.len, &lookup);
273 if (status < 0) {
274 mlog_errno(status);
275 goto leave;
276 }
277
278 /* reserve an inode spot */
279 status = ocfs2_reserve_new_inode(osb, &inode_ac);
280 if (status < 0) {
281 if (status != -ENOSPC)
282 mlog_errno(status);
283 goto leave;
284 }
285
286 inode = ocfs2_get_init_inode(dir, mode);
287 if (!inode) {
288 status = -ENOMEM;
289 mlog_errno(status);
290 goto leave;
291 }
292
293 /* get security xattr */
294 status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
295 if (status) {
296 if (status == -EOPNOTSUPP)
297 si.enable = 0;
298 else {
299 mlog_errno(status);
300 goto leave;
301 }
302 }
303
304 /* calculate meta data/clusters for setting security and acl xattr */
305 status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
306 &si, &want_clusters,
307 &xattr_credits, &want_meta);
308 if (status < 0) {
309 mlog_errno(status);
310 goto leave;
311 }
312
313 /* Reserve a cluster if creating an extent based directory. */
314 if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
315 want_clusters += 1;
316
317 /* Dir indexing requires extra space as well */
318 if (ocfs2_supports_indexed_dirs(osb))
319 want_meta++;
320 }
321
322 status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac);
323 if (status < 0) {
324 if (status != -ENOSPC)
325 mlog_errno(status);
326 goto leave;
327 }
328
329 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
330 if (status < 0) {
331 if (status != -ENOSPC)
332 mlog_errno(status);
333 goto leave;
334 }
335
336 handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb,
337 S_ISDIR(mode),
338 xattr_credits));
339 if (IS_ERR(handle)) {
340 status = PTR_ERR(handle);
341 handle = NULL;
342 mlog_errno(status);
343 goto leave;
344 }
345
346 /* Starting to change things, restart is no longer possible. */
347 ocfs2_block_signals(&oldset);
348 did_block_signals = 1;
349
350 status = dquot_alloc_inode(inode);
351 if (status)
352 goto leave;
353 did_quota_inode = 1;
354
355 /* do the real work now. */
356 status = ocfs2_mknod_locked(osb, dir, inode, dev,
357 &new_fe_bh, parent_fe_bh, handle,
358 inode_ac);
359 if (status < 0) {
360 mlog_errno(status);
361 goto leave;
362 }
363
364 if (S_ISDIR(mode)) {
365 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
366 new_fe_bh, data_ac, meta_ac);
367 if (status < 0) {
368 mlog_errno(status);
369 goto leave;
370 }
371
372 status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
373 parent_fe_bh,
374 OCFS2_JOURNAL_ACCESS_WRITE);
375 if (status < 0) {
376 mlog_errno(status);
377 goto leave;
378 }
379 ocfs2_add_links_count(dirfe, 1);
380 ocfs2_journal_dirty(handle, parent_fe_bh);
381 inc_nlink(dir);
382 }
383
384 status = ocfs2_init_acl(handle, inode, dir, new_fe_bh, parent_fe_bh,
385 meta_ac, data_ac);
386 if (status < 0) {
387 mlog_errno(status);
388 goto leave;
389 }
390
391 if (si.enable) {
392 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
393 meta_ac, data_ac);
394 if (status < 0) {
395 mlog_errno(status);
396 goto leave;
397 }
398 }
399
400 /*
401 * Do this before adding the entry to the directory. We add
402 * also set d_op after success so that ->d_iput() will cleanup
403 * the dentry lock even if ocfs2_add_entry() fails below.
404 */
405 status = ocfs2_dentry_attach_lock(dentry, inode,
406 OCFS2_I(dir)->ip_blkno);
407 if (status) {
408 mlog_errno(status);
409 goto leave;
410 }
411
412 status = ocfs2_add_entry(handle, dentry, inode,
413 OCFS2_I(inode)->ip_blkno, parent_fe_bh,
414 &lookup);
415 if (status < 0) {
416 mlog_errno(status);
417 goto leave;
418 }
419
420 insert_inode_hash(inode);
421 d_instantiate(dentry, inode);
422 status = 0;
423 leave:
424 if (status < 0 && did_quota_inode)
425 dquot_free_inode(inode);
426 if (handle)
427 ocfs2_commit_trans(osb, handle);
428
429 ocfs2_inode_unlock(dir, 1);
430 if (did_block_signals)
431 ocfs2_unblock_signals(&oldset);
432
433 brelse(new_fe_bh);
434 brelse(parent_fe_bh);
435 kfree(si.name);
436 kfree(si.value);
437
438 ocfs2_free_dir_lookup_result(&lookup);
439
440 if (inode_ac)
441 ocfs2_free_alloc_context(inode_ac);
442
443 if (data_ac)
444 ocfs2_free_alloc_context(data_ac);
445
446 if (meta_ac)
447 ocfs2_free_alloc_context(meta_ac);
448
449 /*
450 * We should call iput after the i_mutex of the bitmap been
451 * unlocked in ocfs2_free_alloc_context, or the
452 * ocfs2_delete_inode will mutex_lock again.
453 */
454 if ((status < 0) && inode) {
455 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
456 clear_nlink(inode);
457 iput(inode);
458 }
459
460 if (status)
461 mlog_errno(status);
462
463 return status;
464 }
465
466 static int __ocfs2_mknod_locked(struct inode *dir,
467 struct inode *inode,
468 dev_t dev,
469 struct buffer_head **new_fe_bh,
470 struct buffer_head *parent_fe_bh,
471 handle_t *handle,
472 struct ocfs2_alloc_context *inode_ac,
473 u64 fe_blkno, u64 suballoc_loc, u16 suballoc_bit)
474 {
475 int status = 0;
476 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
477 struct ocfs2_dinode *fe = NULL;
478 struct ocfs2_extent_list *fel;
479 u16 feat;
480
481 *new_fe_bh = NULL;
482
483 /* populate as many fields early on as possible - many of
484 * these are used by the support functions here and in
485 * callers. */
486 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
487 OCFS2_I(inode)->ip_blkno = fe_blkno;
488 spin_lock(&osb->osb_lock);
489 inode->i_generation = osb->s_next_generation++;
490 spin_unlock(&osb->osb_lock);
491
492 *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
493 if (!*new_fe_bh) {
494 status = -EIO;
495 mlog_errno(status);
496 goto leave;
497 }
498 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), *new_fe_bh);
499
500 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
501 *new_fe_bh,
502 OCFS2_JOURNAL_ACCESS_CREATE);
503 if (status < 0) {
504 mlog_errno(status);
505 goto leave;
506 }
507
508 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
509 memset(fe, 0, osb->sb->s_blocksize);
510
511 fe->i_generation = cpu_to_le32(inode->i_generation);
512 fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
513 fe->i_blkno = cpu_to_le64(fe_blkno);
514 fe->i_suballoc_loc = cpu_to_le64(suballoc_loc);
515 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
516 fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot);
517 fe->i_uid = cpu_to_le32(inode->i_uid);
518 fe->i_gid = cpu_to_le32(inode->i_gid);
519 fe->i_mode = cpu_to_le16(inode->i_mode);
520 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
521 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
522
523 ocfs2_set_links_count(fe, inode->i_nlink);
524
525 fe->i_last_eb_blk = 0;
526 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
527 le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
528 fe->i_atime = fe->i_ctime = fe->i_mtime =
529 cpu_to_le64(CURRENT_TIME.tv_sec);
530 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
531 cpu_to_le32(CURRENT_TIME.tv_nsec);
532 fe->i_dtime = 0;
533
534 /*
535 * If supported, directories start with inline data. If inline
536 * isn't supported, but indexing is, we start them as indexed.
537 */
538 feat = le16_to_cpu(fe->i_dyn_features);
539 if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
540 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
541
542 fe->id2.i_data.id_count = cpu_to_le16(
543 ocfs2_max_inline_data_with_xattr(osb->sb, fe));
544 } else {
545 fel = &fe->id2.i_list;
546 fel->l_tree_depth = 0;
547 fel->l_next_free_rec = 0;
548 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
549 }
550
551 ocfs2_journal_dirty(handle, *new_fe_bh);
552
553 ocfs2_populate_inode(inode, fe, 1);
554 ocfs2_ci_set_new(osb, INODE_CACHE(inode));
555 if (!ocfs2_mount_local(osb)) {
556 status = ocfs2_create_new_inode_locks(inode);
557 if (status < 0)
558 mlog_errno(status);
559 }
560
561 status = 0; /* error in ocfs2_create_new_inode_locks is not
562 * critical */
563
564 leave:
565 if (status < 0) {
566 if (*new_fe_bh) {
567 brelse(*new_fe_bh);
568 *new_fe_bh = NULL;
569 }
570 }
571
572 if (status)
573 mlog_errno(status);
574 return status;
575 }
576
577 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
578 struct inode *dir,
579 struct inode *inode,
580 dev_t dev,
581 struct buffer_head **new_fe_bh,
582 struct buffer_head *parent_fe_bh,
583 handle_t *handle,
584 struct ocfs2_alloc_context *inode_ac)
585 {
586 int status = 0;
587 u64 suballoc_loc, fe_blkno = 0;
588 u16 suballoc_bit;
589
590 *new_fe_bh = NULL;
591
592 status = ocfs2_claim_new_inode(handle, dir, parent_fe_bh,
593 inode_ac, &suballoc_loc,
594 &suballoc_bit, &fe_blkno);
595 if (status < 0) {
596 mlog_errno(status);
597 return status;
598 }
599
600 return __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
601 parent_fe_bh, handle, inode_ac,
602 fe_blkno, suballoc_loc, suballoc_bit);
603 }
604
605 static int ocfs2_mkdir(struct inode *dir,
606 struct dentry *dentry,
607 int mode)
608 {
609 int ret;
610
611 trace_ocfs2_mkdir(dir, dentry, dentry->d_name.len, dentry->d_name.name,
612 OCFS2_I(dir)->ip_blkno, mode);
613 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
614 if (ret)
615 mlog_errno(ret);
616
617 return ret;
618 }
619
620 static int ocfs2_create(struct inode *dir,
621 struct dentry *dentry,
622 int mode,
623 struct nameidata *nd)
624 {
625 int ret;
626
627 trace_ocfs2_create(dir, dentry, dentry->d_name.len, dentry->d_name.name,
628 (unsigned long long)OCFS2_I(dir)->ip_blkno, mode);
629 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
630 if (ret)
631 mlog_errno(ret);
632
633 return ret;
634 }
635
636 static int ocfs2_link(struct dentry *old_dentry,
637 struct inode *dir,
638 struct dentry *dentry)
639 {
640 handle_t *handle;
641 struct inode *inode = old_dentry->d_inode;
642 int err;
643 struct buffer_head *fe_bh = NULL;
644 struct buffer_head *parent_fe_bh = NULL;
645 struct ocfs2_dinode *fe = NULL;
646 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
647 struct ocfs2_dir_lookup_result lookup = { NULL, };
648 sigset_t oldset;
649
650 trace_ocfs2_link((unsigned long long)OCFS2_I(inode)->ip_blkno,
651 old_dentry->d_name.len, old_dentry->d_name.name,
652 dentry->d_name.len, dentry->d_name.name);
653
654 if (S_ISDIR(inode->i_mode))
655 return -EPERM;
656
657 dquot_initialize(dir);
658
659 err = ocfs2_inode_lock_nested(dir, &parent_fe_bh, 1, OI_LS_PARENT);
660 if (err < 0) {
661 if (err != -ENOENT)
662 mlog_errno(err);
663 return err;
664 }
665
666 if (!dir->i_nlink) {
667 err = -ENOENT;
668 goto out;
669 }
670
671 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
672 dentry->d_name.len);
673 if (err)
674 goto out;
675
676 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
677 dentry->d_name.name,
678 dentry->d_name.len, &lookup);
679 if (err < 0) {
680 mlog_errno(err);
681 goto out;
682 }
683
684 err = ocfs2_inode_lock(inode, &fe_bh, 1);
685 if (err < 0) {
686 if (err != -ENOENT)
687 mlog_errno(err);
688 goto out;
689 }
690
691 fe = (struct ocfs2_dinode *) fe_bh->b_data;
692 if (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) {
693 err = -EMLINK;
694 goto out_unlock_inode;
695 }
696
697 handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb));
698 if (IS_ERR(handle)) {
699 err = PTR_ERR(handle);
700 handle = NULL;
701 mlog_errno(err);
702 goto out_unlock_inode;
703 }
704
705 /* Starting to change things, restart is no longer possible. */
706 ocfs2_block_signals(&oldset);
707
708 err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
709 OCFS2_JOURNAL_ACCESS_WRITE);
710 if (err < 0) {
711 mlog_errno(err);
712 goto out_commit;
713 }
714
715 inc_nlink(inode);
716 inode->i_ctime = CURRENT_TIME;
717 ocfs2_set_links_count(fe, inode->i_nlink);
718 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
719 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
720 ocfs2_journal_dirty(handle, fe_bh);
721
722 err = ocfs2_add_entry(handle, dentry, inode,
723 OCFS2_I(inode)->ip_blkno,
724 parent_fe_bh, &lookup);
725 if (err) {
726 ocfs2_add_links_count(fe, -1);
727 drop_nlink(inode);
728 mlog_errno(err);
729 goto out_commit;
730 }
731
732 err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
733 if (err) {
734 mlog_errno(err);
735 goto out_commit;
736 }
737
738 ihold(inode);
739 d_instantiate(dentry, inode);
740
741 out_commit:
742 ocfs2_commit_trans(osb, handle);
743 ocfs2_unblock_signals(&oldset);
744 out_unlock_inode:
745 ocfs2_inode_unlock(inode, 1);
746
747 out:
748 ocfs2_inode_unlock(dir, 1);
749
750 brelse(fe_bh);
751 brelse(parent_fe_bh);
752
753 ocfs2_free_dir_lookup_result(&lookup);
754
755 if (err)
756 mlog_errno(err);
757
758 return err;
759 }
760
761 /*
762 * Takes and drops an exclusive lock on the given dentry. This will
763 * force other nodes to drop it.
764 */
765 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
766 {
767 int ret;
768
769 ret = ocfs2_dentry_lock(dentry, 1);
770 if (ret)
771 mlog_errno(ret);
772 else
773 ocfs2_dentry_unlock(dentry, 1);
774
775 return ret;
776 }
777
778 static inline int inode_is_unlinkable(struct inode *inode)
779 {
780 if (S_ISDIR(inode->i_mode)) {
781 if (inode->i_nlink == 2)
782 return 1;
783 return 0;
784 }
785
786 if (inode->i_nlink == 1)
787 return 1;
788 return 0;
789 }
790
791 static int ocfs2_unlink(struct inode *dir,
792 struct dentry *dentry)
793 {
794 int status;
795 int child_locked = 0;
796 struct inode *inode = dentry->d_inode;
797 struct inode *orphan_dir = NULL;
798 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
799 u64 blkno;
800 struct ocfs2_dinode *fe = NULL;
801 struct buffer_head *fe_bh = NULL;
802 struct buffer_head *parent_node_bh = NULL;
803 handle_t *handle = NULL;
804 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
805 struct ocfs2_dir_lookup_result lookup = { NULL, };
806 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
807
808 trace_ocfs2_unlink(dir, dentry, dentry->d_name.len,
809 dentry->d_name.name,
810 (unsigned long long)OCFS2_I(dir)->ip_blkno,
811 (unsigned long long)OCFS2_I(inode)->ip_blkno);
812
813 dquot_initialize(dir);
814
815 BUG_ON(dentry->d_parent->d_inode != dir);
816
817 if (inode == osb->root_inode)
818 return -EPERM;
819
820 status = ocfs2_inode_lock_nested(dir, &parent_node_bh, 1,
821 OI_LS_PARENT);
822 if (status < 0) {
823 if (status != -ENOENT)
824 mlog_errno(status);
825 return status;
826 }
827
828 status = ocfs2_find_files_on_disk(dentry->d_name.name,
829 dentry->d_name.len, &blkno, dir,
830 &lookup);
831 if (status < 0) {
832 if (status != -ENOENT)
833 mlog_errno(status);
834 goto leave;
835 }
836
837 if (OCFS2_I(inode)->ip_blkno != blkno) {
838 status = -ENOENT;
839
840 trace_ocfs2_unlink_noent(
841 (unsigned long long)OCFS2_I(inode)->ip_blkno,
842 (unsigned long long)blkno,
843 OCFS2_I(inode)->ip_flags);
844 goto leave;
845 }
846
847 status = ocfs2_inode_lock(inode, &fe_bh, 1);
848 if (status < 0) {
849 if (status != -ENOENT)
850 mlog_errno(status);
851 goto leave;
852 }
853 child_locked = 1;
854
855 if (S_ISDIR(inode->i_mode)) {
856 if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
857 status = -ENOTEMPTY;
858 goto leave;
859 }
860 }
861
862 status = ocfs2_remote_dentry_delete(dentry);
863 if (status < 0) {
864 /* This remote delete should succeed under all normal
865 * circumstances. */
866 mlog_errno(status);
867 goto leave;
868 }
869
870 if (inode_is_unlinkable(inode)) {
871 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
872 OCFS2_I(inode)->ip_blkno,
873 orphan_name, &orphan_insert);
874 if (status < 0) {
875 mlog_errno(status);
876 goto leave;
877 }
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 if (inode_is_unlinkable(inode)) {
898 status = ocfs2_orphan_add(osb, handle, inode, fe_bh, orphan_name,
899 &orphan_insert, orphan_dir);
900 if (status < 0) {
901 mlog_errno(status);
902 goto leave;
903 }
904 }
905
906 /* delete the name from the parent dir */
907 status = ocfs2_delete_entry(handle, dir, &lookup);
908 if (status < 0) {
909 mlog_errno(status);
910 goto leave;
911 }
912
913 if (S_ISDIR(inode->i_mode))
914 drop_nlink(inode);
915 drop_nlink(inode);
916 ocfs2_set_links_count(fe, inode->i_nlink);
917 ocfs2_journal_dirty(handle, fe_bh);
918
919 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
920 if (S_ISDIR(inode->i_mode))
921 drop_nlink(dir);
922
923 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
924 if (status < 0) {
925 mlog_errno(status);
926 if (S_ISDIR(inode->i_mode))
927 inc_nlink(dir);
928 }
929
930 leave:
931 if (handle)
932 ocfs2_commit_trans(osb, handle);
933
934 if (child_locked)
935 ocfs2_inode_unlock(inode, 1);
936
937 ocfs2_inode_unlock(dir, 1);
938
939 if (orphan_dir) {
940 /* This was locked for us in ocfs2_prepare_orphan_dir() */
941 ocfs2_inode_unlock(orphan_dir, 1);
942 mutex_unlock(&orphan_dir->i_mutex);
943 iput(orphan_dir);
944 }
945
946 brelse(fe_bh);
947 brelse(parent_node_bh);
948
949 ocfs2_free_dir_lookup_result(&orphan_insert);
950 ocfs2_free_dir_lookup_result(&lookup);
951
952 if (status)
953 mlog_errno(status);
954
955 return status;
956 }
957
958 /*
959 * The only place this should be used is rename!
960 * if they have the same id, then the 1st one is the only one locked.
961 */
962 static int ocfs2_double_lock(struct ocfs2_super *osb,
963 struct buffer_head **bh1,
964 struct inode *inode1,
965 struct buffer_head **bh2,
966 struct inode *inode2)
967 {
968 int status;
969 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
970 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
971 struct buffer_head **tmpbh;
972 struct inode *tmpinode;
973
974 trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno,
975 (unsigned long long)oi2->ip_blkno);
976
977 if (*bh1)
978 *bh1 = NULL;
979 if (*bh2)
980 *bh2 = NULL;
981
982 /* we always want to lock the one with the lower lockid first. */
983 if (oi1->ip_blkno != oi2->ip_blkno) {
984 if (oi1->ip_blkno < oi2->ip_blkno) {
985 /* switch id1 and id2 around */
986 tmpbh = bh2;
987 bh2 = bh1;
988 bh1 = tmpbh;
989
990 tmpinode = inode2;
991 inode2 = inode1;
992 inode1 = tmpinode;
993 }
994 /* lock id2 */
995 status = ocfs2_inode_lock_nested(inode2, bh2, 1,
996 OI_LS_RENAME1);
997 if (status < 0) {
998 if (status != -ENOENT)
999 mlog_errno(status);
1000 goto bail;
1001 }
1002 }
1003
1004 /* lock id1 */
1005 status = ocfs2_inode_lock_nested(inode1, bh1, 1, OI_LS_RENAME2);
1006 if (status < 0) {
1007 /*
1008 * An error return must mean that no cluster locks
1009 * were held on function exit.
1010 */
1011 if (oi1->ip_blkno != oi2->ip_blkno) {
1012 ocfs2_inode_unlock(inode2, 1);
1013 brelse(*bh2);
1014 *bh2 = NULL;
1015 }
1016
1017 if (status != -ENOENT)
1018 mlog_errno(status);
1019 }
1020
1021 trace_ocfs2_double_lock_end(
1022 (unsigned long long)OCFS2_I(inode1)->ip_blkno,
1023 (unsigned long long)OCFS2_I(inode2)->ip_blkno);
1024
1025 bail:
1026 if (status)
1027 mlog_errno(status);
1028 return status;
1029 }
1030
1031 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1032 {
1033 ocfs2_inode_unlock(inode1, 1);
1034
1035 if (inode1 != inode2)
1036 ocfs2_inode_unlock(inode2, 1);
1037 }
1038
1039 static int ocfs2_rename(struct inode *old_dir,
1040 struct dentry *old_dentry,
1041 struct inode *new_dir,
1042 struct dentry *new_dentry)
1043 {
1044 int status = 0, rename_lock = 0, parents_locked = 0, target_exists = 0;
1045 int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 0;
1046 struct inode *old_inode = old_dentry->d_inode;
1047 struct inode *new_inode = new_dentry->d_inode;
1048 struct inode *orphan_dir = NULL;
1049 struct ocfs2_dinode *newfe = NULL;
1050 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1051 struct buffer_head *newfe_bh = NULL;
1052 struct buffer_head *old_inode_bh = NULL;
1053 struct ocfs2_super *osb = NULL;
1054 u64 newfe_blkno, old_de_ino;
1055 handle_t *handle = NULL;
1056 struct buffer_head *old_dir_bh = NULL;
1057 struct buffer_head *new_dir_bh = NULL;
1058 nlink_t old_dir_nlink = old_dir->i_nlink;
1059 struct ocfs2_dinode *old_di;
1060 struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
1061 struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
1062 struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
1063 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
1064 struct ocfs2_dir_lookup_result target_insert = { NULL, };
1065
1066 /* At some point it might be nice to break this function up a
1067 * bit. */
1068
1069 trace_ocfs2_rename(old_dir, old_dentry, new_dir, new_dentry,
1070 old_dentry->d_name.len, old_dentry->d_name.name,
1071 new_dentry->d_name.len, new_dentry->d_name.name);
1072
1073 dquot_initialize(old_dir);
1074 dquot_initialize(new_dir);
1075
1076 osb = OCFS2_SB(old_dir->i_sb);
1077
1078 if (new_inode) {
1079 if (!igrab(new_inode))
1080 BUG();
1081 }
1082
1083 /* Assume a directory hierarchy thusly:
1084 * a/b/c
1085 * a/d
1086 * a,b,c, and d are all directories.
1087 *
1088 * from cwd of 'a' on both nodes:
1089 * node1: mv b/c d
1090 * node2: mv d b/c
1091 *
1092 * And that's why, just like the VFS, we need a file system
1093 * rename lock. */
1094 if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
1095 status = ocfs2_rename_lock(osb);
1096 if (status < 0) {
1097 mlog_errno(status);
1098 goto bail;
1099 }
1100 rename_lock = 1;
1101 }
1102
1103 /* if old and new are the same, this'll just do one lock. */
1104 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1105 &new_dir_bh, new_dir);
1106 if (status < 0) {
1107 mlog_errno(status);
1108 goto bail;
1109 }
1110 parents_locked = 1;
1111
1112 /* make sure both dirs have bhs
1113 * get an extra ref on old_dir_bh if old==new */
1114 if (!new_dir_bh) {
1115 if (old_dir_bh) {
1116 new_dir_bh = old_dir_bh;
1117 get_bh(new_dir_bh);
1118 } else {
1119 mlog(ML_ERROR, "no old_dir_bh!\n");
1120 status = -EIO;
1121 goto bail;
1122 }
1123 }
1124
1125 /*
1126 * Aside from allowing a meta data update, the locking here
1127 * also ensures that the downconvert thread on other nodes
1128 * won't have to concurrently downconvert the inode and the
1129 * dentry locks.
1130 */
1131 status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
1132 OI_LS_PARENT);
1133 if (status < 0) {
1134 if (status != -ENOENT)
1135 mlog_errno(status);
1136 goto bail;
1137 }
1138 old_child_locked = 1;
1139
1140 status = ocfs2_remote_dentry_delete(old_dentry);
1141 if (status < 0) {
1142 mlog_errno(status);
1143 goto bail;
1144 }
1145
1146 if (S_ISDIR(old_inode->i_mode)) {
1147 u64 old_inode_parent;
1148
1149 update_dot_dot = 1;
1150 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1151 old_inode,
1152 &old_inode_dot_dot_res);
1153 if (status) {
1154 status = -EIO;
1155 goto bail;
1156 }
1157
1158 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1159 status = -EIO;
1160 goto bail;
1161 }
1162
1163 if (!new_inode && new_dir != old_dir &&
1164 new_dir->i_nlink >= ocfs2_link_max(osb)) {
1165 status = -EMLINK;
1166 goto bail;
1167 }
1168 }
1169
1170 status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1171 old_dentry->d_name.len,
1172 &old_de_ino);
1173 if (status) {
1174 status = -ENOENT;
1175 goto bail;
1176 }
1177
1178 /*
1179 * Check for inode number is _not_ due to possible IO errors.
1180 * We might rmdir the source, keep it as pwd of some process
1181 * and merrily kill the link to whatever was created under the
1182 * same name. Goodbye sticky bit ;-<
1183 */
1184 if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1185 status = -ENOENT;
1186 goto bail;
1187 }
1188
1189 /* check if the target already exists (in which case we need
1190 * to delete it */
1191 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1192 new_dentry->d_name.len,
1193 &newfe_blkno, new_dir,
1194 &target_lookup_res);
1195 /* The only error we allow here is -ENOENT because the new
1196 * file not existing is perfectly valid. */
1197 if ((status < 0) && (status != -ENOENT)) {
1198 /* If we cannot find the file specified we should just */
1199 /* return the error... */
1200 mlog_errno(status);
1201 goto bail;
1202 }
1203 if (status == 0)
1204 target_exists = 1;
1205
1206 if (!target_exists && new_inode) {
1207 /*
1208 * Target was unlinked by another node while we were
1209 * waiting to get to ocfs2_rename(). There isn't
1210 * anything we can do here to help the situation, so
1211 * bubble up the appropriate error.
1212 */
1213 status = -ENOENT;
1214 goto bail;
1215 }
1216
1217 /* In case we need to overwrite an existing file, we blow it
1218 * away first */
1219 if (target_exists) {
1220 /* VFS didn't think there existed an inode here, but
1221 * someone else in the cluster must have raced our
1222 * rename to create one. Today we error cleanly, in
1223 * the future we should consider calling iget to build
1224 * a new struct inode for this entry. */
1225 if (!new_inode) {
1226 status = -EACCES;
1227
1228 trace_ocfs2_rename_target_exists(new_dentry->d_name.len,
1229 new_dentry->d_name.name);
1230 goto bail;
1231 }
1232
1233 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1234 status = -EACCES;
1235
1236 trace_ocfs2_rename_disagree(
1237 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1238 (unsigned long long)newfe_blkno,
1239 OCFS2_I(new_inode)->ip_flags);
1240 goto bail;
1241 }
1242
1243 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1244 if (status < 0) {
1245 if (status != -ENOENT)
1246 mlog_errno(status);
1247 goto bail;
1248 }
1249 new_child_locked = 1;
1250
1251 status = ocfs2_remote_dentry_delete(new_dentry);
1252 if (status < 0) {
1253 mlog_errno(status);
1254 goto bail;
1255 }
1256
1257 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1258
1259 trace_ocfs2_rename_over_existing(
1260 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1261 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1262
1263 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1264 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1265 OCFS2_I(new_inode)->ip_blkno,
1266 orphan_name, &orphan_insert);
1267 if (status < 0) {
1268 mlog_errno(status);
1269 goto bail;
1270 }
1271 }
1272 } else {
1273 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1274
1275 status = ocfs2_check_dir_for_entry(new_dir,
1276 new_dentry->d_name.name,
1277 new_dentry->d_name.len);
1278 if (status)
1279 goto bail;
1280
1281 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1282 new_dentry->d_name.name,
1283 new_dentry->d_name.len,
1284 &target_insert);
1285 if (status < 0) {
1286 mlog_errno(status);
1287 goto bail;
1288 }
1289 }
1290
1291 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
1292 if (IS_ERR(handle)) {
1293 status = PTR_ERR(handle);
1294 handle = NULL;
1295 mlog_errno(status);
1296 goto bail;
1297 }
1298
1299 if (target_exists) {
1300 if (S_ISDIR(new_inode->i_mode)) {
1301 if (new_inode->i_nlink != 2 ||
1302 !ocfs2_empty_dir(new_inode)) {
1303 status = -ENOTEMPTY;
1304 goto bail;
1305 }
1306 }
1307 status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
1308 newfe_bh,
1309 OCFS2_JOURNAL_ACCESS_WRITE);
1310 if (status < 0) {
1311 mlog_errno(status);
1312 goto bail;
1313 }
1314
1315 if (S_ISDIR(new_inode->i_mode) ||
1316 (ocfs2_read_links_count(newfe) == 1)) {
1317 status = ocfs2_orphan_add(osb, handle, new_inode,
1318 newfe_bh, orphan_name,
1319 &orphan_insert, orphan_dir);
1320 if (status < 0) {
1321 mlog_errno(status);
1322 goto bail;
1323 }
1324 }
1325
1326 /* change the dirent to point to the correct inode */
1327 status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
1328 old_inode);
1329 if (status < 0) {
1330 mlog_errno(status);
1331 goto bail;
1332 }
1333 new_dir->i_version++;
1334
1335 if (S_ISDIR(new_inode->i_mode))
1336 ocfs2_set_links_count(newfe, 0);
1337 else
1338 ocfs2_add_links_count(newfe, -1);
1339 ocfs2_journal_dirty(handle, newfe_bh);
1340 } else {
1341 /* if the name was not found in new_dir, add it now */
1342 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1343 OCFS2_I(old_inode)->ip_blkno,
1344 new_dir_bh, &target_insert);
1345 }
1346
1347 old_inode->i_ctime = CURRENT_TIME;
1348 mark_inode_dirty(old_inode);
1349
1350 status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode),
1351 old_inode_bh,
1352 OCFS2_JOURNAL_ACCESS_WRITE);
1353 if (status >= 0) {
1354 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1355
1356 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1357 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1358 ocfs2_journal_dirty(handle, old_inode_bh);
1359 } else
1360 mlog_errno(status);
1361
1362 /*
1363 * Now that the name has been added to new_dir, remove the old name.
1364 *
1365 * We don't keep any directory entry context around until now
1366 * because the insert might have changed the type of directory
1367 * we're dealing with.
1368 */
1369 status = ocfs2_find_entry(old_dentry->d_name.name,
1370 old_dentry->d_name.len, old_dir,
1371 &old_entry_lookup);
1372 if (status)
1373 goto bail;
1374
1375 status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
1376 if (status < 0) {
1377 mlog_errno(status);
1378 goto bail;
1379 }
1380
1381 if (new_inode) {
1382 new_inode->i_nlink--;
1383 new_inode->i_ctime = CURRENT_TIME;
1384 }
1385 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1386
1387 if (update_dot_dot) {
1388 status = ocfs2_update_entry(old_inode, handle,
1389 &old_inode_dot_dot_res, new_dir);
1390 old_dir->i_nlink--;
1391 if (new_inode) {
1392 new_inode->i_nlink--;
1393 } else {
1394 inc_nlink(new_dir);
1395 mark_inode_dirty(new_dir);
1396 }
1397 }
1398 mark_inode_dirty(old_dir);
1399 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1400 if (new_inode) {
1401 mark_inode_dirty(new_inode);
1402 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1403 }
1404
1405 if (old_dir != new_dir) {
1406 /* Keep the same times on both directories.*/
1407 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1408
1409 /*
1410 * This will also pick up the i_nlink change from the
1411 * block above.
1412 */
1413 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1414 }
1415
1416 if (old_dir_nlink != old_dir->i_nlink) {
1417 if (!old_dir_bh) {
1418 mlog(ML_ERROR, "need to change nlink for old dir "
1419 "%llu from %d to %d but bh is NULL!\n",
1420 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1421 (int)old_dir_nlink, old_dir->i_nlink);
1422 } else {
1423 struct ocfs2_dinode *fe;
1424 status = ocfs2_journal_access_di(handle,
1425 INODE_CACHE(old_dir),
1426 old_dir_bh,
1427 OCFS2_JOURNAL_ACCESS_WRITE);
1428 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1429 ocfs2_set_links_count(fe, old_dir->i_nlink);
1430 ocfs2_journal_dirty(handle, old_dir_bh);
1431 }
1432 }
1433 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1434 status = 0;
1435 bail:
1436 if (rename_lock)
1437 ocfs2_rename_unlock(osb);
1438
1439 if (handle)
1440 ocfs2_commit_trans(osb, handle);
1441
1442 if (parents_locked)
1443 ocfs2_double_unlock(old_dir, new_dir);
1444
1445 if (old_child_locked)
1446 ocfs2_inode_unlock(old_inode, 1);
1447
1448 if (new_child_locked)
1449 ocfs2_inode_unlock(new_inode, 1);
1450
1451 if (orphan_dir) {
1452 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1453 ocfs2_inode_unlock(orphan_dir, 1);
1454 mutex_unlock(&orphan_dir->i_mutex);
1455 iput(orphan_dir);
1456 }
1457
1458 if (new_inode)
1459 sync_mapping_buffers(old_inode->i_mapping);
1460
1461 if (new_inode)
1462 iput(new_inode);
1463
1464 ocfs2_free_dir_lookup_result(&target_lookup_res);
1465 ocfs2_free_dir_lookup_result(&old_entry_lookup);
1466 ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
1467 ocfs2_free_dir_lookup_result(&orphan_insert);
1468 ocfs2_free_dir_lookup_result(&target_insert);
1469
1470 brelse(newfe_bh);
1471 brelse(old_inode_bh);
1472 brelse(old_dir_bh);
1473 brelse(new_dir_bh);
1474
1475 if (status)
1476 mlog_errno(status);
1477
1478 return status;
1479 }
1480
1481 /*
1482 * we expect i_size = strlen(symname). Copy symname into the file
1483 * data, including the null terminator.
1484 */
1485 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1486 handle_t *handle,
1487 struct inode *inode,
1488 const char *symname)
1489 {
1490 struct buffer_head **bhs = NULL;
1491 const char *c;
1492 struct super_block *sb = osb->sb;
1493 u64 p_blkno, p_blocks;
1494 int virtual, blocks, status, i, bytes_left;
1495
1496 bytes_left = i_size_read(inode) + 1;
1497 /* we can't trust i_blocks because we're actually going to
1498 * write i_size + 1 bytes. */
1499 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1500
1501 trace_ocfs2_create_symlink_data((unsigned long long)inode->i_blocks,
1502 i_size_read(inode), blocks);
1503
1504 /* Sanity check -- make sure we're going to fit. */
1505 if (bytes_left >
1506 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1507 status = -EIO;
1508 mlog_errno(status);
1509 goto bail;
1510 }
1511
1512 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1513 if (!bhs) {
1514 status = -ENOMEM;
1515 mlog_errno(status);
1516 goto bail;
1517 }
1518
1519 status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1520 NULL);
1521 if (status < 0) {
1522 mlog_errno(status);
1523 goto bail;
1524 }
1525
1526 /* links can never be larger than one cluster so we know this
1527 * is all going to be contiguous, but do a sanity check
1528 * anyway. */
1529 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1530 status = -EIO;
1531 mlog_errno(status);
1532 goto bail;
1533 }
1534
1535 virtual = 0;
1536 while(bytes_left > 0) {
1537 c = &symname[virtual * sb->s_blocksize];
1538
1539 bhs[virtual] = sb_getblk(sb, p_blkno);
1540 if (!bhs[virtual]) {
1541 status = -ENOMEM;
1542 mlog_errno(status);
1543 goto bail;
1544 }
1545 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode),
1546 bhs[virtual]);
1547
1548 status = ocfs2_journal_access(handle, INODE_CACHE(inode),
1549 bhs[virtual],
1550 OCFS2_JOURNAL_ACCESS_CREATE);
1551 if (status < 0) {
1552 mlog_errno(status);
1553 goto bail;
1554 }
1555
1556 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1557
1558 memcpy(bhs[virtual]->b_data, c,
1559 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1560 bytes_left);
1561
1562 ocfs2_journal_dirty(handle, bhs[virtual]);
1563
1564 virtual++;
1565 p_blkno++;
1566 bytes_left -= sb->s_blocksize;
1567 }
1568
1569 status = 0;
1570 bail:
1571
1572 if (bhs) {
1573 for(i = 0; i < blocks; i++)
1574 brelse(bhs[i]);
1575 kfree(bhs);
1576 }
1577
1578 if (status)
1579 mlog_errno(status);
1580 return status;
1581 }
1582
1583 static int ocfs2_symlink(struct inode *dir,
1584 struct dentry *dentry,
1585 const char *symname)
1586 {
1587 int status, l, credits;
1588 u64 newsize;
1589 struct ocfs2_super *osb = NULL;
1590 struct inode *inode = NULL;
1591 struct super_block *sb;
1592 struct buffer_head *new_fe_bh = NULL;
1593 struct buffer_head *parent_fe_bh = NULL;
1594 struct ocfs2_dinode *fe = NULL;
1595 struct ocfs2_dinode *dirfe;
1596 handle_t *handle = NULL;
1597 struct ocfs2_alloc_context *inode_ac = NULL;
1598 struct ocfs2_alloc_context *data_ac = NULL;
1599 struct ocfs2_alloc_context *xattr_ac = NULL;
1600 int want_clusters = 0;
1601 int xattr_credits = 0;
1602 struct ocfs2_security_xattr_info si = {
1603 .enable = 1,
1604 };
1605 int did_quota = 0, did_quota_inode = 0;
1606 struct ocfs2_dir_lookup_result lookup = { NULL, };
1607 sigset_t oldset;
1608 int did_block_signals = 0;
1609
1610 trace_ocfs2_symlink_begin(dir, dentry, symname,
1611 dentry->d_name.len, dentry->d_name.name);
1612
1613 dquot_initialize(dir);
1614
1615 sb = dir->i_sb;
1616 osb = OCFS2_SB(sb);
1617
1618 l = strlen(symname) + 1;
1619
1620 credits = ocfs2_calc_symlink_credits(sb);
1621
1622 /* lock the parent directory */
1623 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1624 if (status < 0) {
1625 if (status != -ENOENT)
1626 mlog_errno(status);
1627 return status;
1628 }
1629
1630 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1631 if (!ocfs2_read_links_count(dirfe)) {
1632 /* can't make a file in a deleted directory. */
1633 status = -ENOENT;
1634 goto bail;
1635 }
1636
1637 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1638 dentry->d_name.len);
1639 if (status)
1640 goto bail;
1641
1642 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1643 dentry->d_name.name,
1644 dentry->d_name.len, &lookup);
1645 if (status < 0) {
1646 mlog_errno(status);
1647 goto bail;
1648 }
1649
1650 status = ocfs2_reserve_new_inode(osb, &inode_ac);
1651 if (status < 0) {
1652 if (status != -ENOSPC)
1653 mlog_errno(status);
1654 goto bail;
1655 }
1656
1657 inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
1658 if (!inode) {
1659 status = -ENOMEM;
1660 mlog_errno(status);
1661 goto bail;
1662 }
1663
1664 /* get security xattr */
1665 status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
1666 if (status) {
1667 if (status == -EOPNOTSUPP)
1668 si.enable = 0;
1669 else {
1670 mlog_errno(status);
1671 goto bail;
1672 }
1673 }
1674
1675 /* calculate meta data/clusters for setting security xattr */
1676 if (si.enable) {
1677 status = ocfs2_calc_security_init(dir, &si, &want_clusters,
1678 &xattr_credits, &xattr_ac);
1679 if (status < 0) {
1680 mlog_errno(status);
1681 goto bail;
1682 }
1683 }
1684
1685 /* don't reserve bitmap space for fast symlinks. */
1686 if (l > ocfs2_fast_symlink_chars(sb))
1687 want_clusters += 1;
1688
1689 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
1690 if (status < 0) {
1691 if (status != -ENOSPC)
1692 mlog_errno(status);
1693 goto bail;
1694 }
1695
1696 handle = ocfs2_start_trans(osb, credits + xattr_credits);
1697 if (IS_ERR(handle)) {
1698 status = PTR_ERR(handle);
1699 handle = NULL;
1700 mlog_errno(status);
1701 goto bail;
1702 }
1703
1704 /* Starting to change things, restart is no longer possible. */
1705 ocfs2_block_signals(&oldset);
1706 did_block_signals = 1;
1707
1708 status = dquot_alloc_inode(inode);
1709 if (status)
1710 goto bail;
1711 did_quota_inode = 1;
1712
1713 trace_ocfs2_symlink_create(dir, dentry, dentry->d_name.len,
1714 dentry->d_name.name,
1715 (unsigned long long)OCFS2_I(dir)->ip_blkno,
1716 inode->i_mode);
1717
1718 status = ocfs2_mknod_locked(osb, dir, inode,
1719 0, &new_fe_bh, parent_fe_bh, handle,
1720 inode_ac);
1721 if (status < 0) {
1722 mlog_errno(status);
1723 goto bail;
1724 }
1725
1726 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1727 inode->i_rdev = 0;
1728 newsize = l - 1;
1729 if (l > ocfs2_fast_symlink_chars(sb)) {
1730 u32 offset = 0;
1731
1732 inode->i_op = &ocfs2_symlink_inode_operations;
1733 status = dquot_alloc_space_nodirty(inode,
1734 ocfs2_clusters_to_bytes(osb->sb, 1));
1735 if (status)
1736 goto bail;
1737 did_quota = 1;
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_op = &ocfs2_fast_symlink_inode_operations;
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 /* we're a cluster, and nlink can change on disk from
2017 * underneath us... */
2018 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2019 if (S_ISDIR(inode->i_mode))
2020 ocfs2_add_links_count(orphan_fe, 1);
2021 orphan_dir_inode->i_nlink = ocfs2_read_links_count(orphan_fe);
2022 ocfs2_journal_dirty(handle, orphan_dir_bh);
2023
2024 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2025 OCFS2_ORPHAN_NAMELEN, inode,
2026 OCFS2_I(inode)->ip_blkno,
2027 orphan_dir_bh, lookup);
2028 if (status < 0) {
2029 mlog_errno(status);
2030 goto leave;
2031 }
2032
2033 /*
2034 * We're going to journal the change of i_flags and i_orphaned_slot.
2035 * It's safe anyway, though some callers may duplicate the journaling.
2036 * Journaling within the func just make the logic look more
2037 * straightforward.
2038 */
2039 status = ocfs2_journal_access_di(handle,
2040 INODE_CACHE(inode),
2041 fe_bh,
2042 OCFS2_JOURNAL_ACCESS_WRITE);
2043 if (status < 0) {
2044 mlog_errno(status);
2045 goto leave;
2046 }
2047
2048 le32_add_cpu(&fe->i_flags, 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 leave:
2062 brelse(orphan_dir_bh);
2063
2064 if (status)
2065 mlog_errno(status);
2066 return status;
2067 }
2068
2069 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2070 int ocfs2_orphan_del(struct ocfs2_super *osb,
2071 handle_t *handle,
2072 struct inode *orphan_dir_inode,
2073 struct inode *inode,
2074 struct buffer_head *orphan_dir_bh)
2075 {
2076 char name[OCFS2_ORPHAN_NAMELEN + 1];
2077 struct ocfs2_dinode *orphan_fe;
2078 int status = 0;
2079 struct ocfs2_dir_lookup_result lookup = { NULL, };
2080
2081 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2082 if (status < 0) {
2083 mlog_errno(status);
2084 goto leave;
2085 }
2086
2087 trace_ocfs2_orphan_del(
2088 (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2089 name, OCFS2_ORPHAN_NAMELEN);
2090
2091 /* find it's spot in the orphan directory */
2092 status = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, orphan_dir_inode,
2093 &lookup);
2094 if (status) {
2095 mlog_errno(status);
2096 goto leave;
2097 }
2098
2099 /* remove it from the orphan directory */
2100 status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup);
2101 if (status < 0) {
2102 mlog_errno(status);
2103 goto leave;
2104 }
2105
2106 status = ocfs2_journal_access_di(handle,
2107 INODE_CACHE(orphan_dir_inode),
2108 orphan_dir_bh,
2109 OCFS2_JOURNAL_ACCESS_WRITE);
2110 if (status < 0) {
2111 mlog_errno(status);
2112 goto leave;
2113 }
2114
2115 /* do the i_nlink dance! :) */
2116 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2117 if (S_ISDIR(inode->i_mode))
2118 ocfs2_add_links_count(orphan_fe, -1);
2119 orphan_dir_inode->i_nlink = ocfs2_read_links_count(orphan_fe);
2120 ocfs2_journal_dirty(handle, orphan_dir_bh);
2121
2122 leave:
2123 ocfs2_free_dir_lookup_result(&lookup);
2124
2125 if (status)
2126 mlog_errno(status);
2127 return status;
2128 }
2129
2130 /**
2131 * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to receive a newly
2132 * allocated file. This is different from the typical 'add to orphan dir'
2133 * operation in that the inode does not yet exist. This is a problem because
2134 * the orphan dir stringifies the inode block number to come up with it's
2135 * dirent. Obviously if the inode does not yet exist we have a chicken and egg
2136 * problem. This function works around it by calling deeper into the orphan
2137 * and suballoc code than other callers. Use this only by necessity.
2138 * @dir: The directory which this inode will ultimately wind up under - not the
2139 * orphan dir!
2140 * @dir_bh: buffer_head the @dir inode block
2141 * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled
2142 * with the string to be used for orphan dirent. Pass back to the orphan dir
2143 * code.
2144 * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan
2145 * dir code.
2146 * @ret_di_blkno: block number where the new inode will be allocated.
2147 * @orphan_insert: Dir insert context to be passed back into orphan dir code.
2148 * @ret_inode_ac: Inode alloc context to be passed back to the allocator.
2149 *
2150 * Returns zero on success and the ret_orphan_dir, name and lookup
2151 * fields will be populated.
2152 *
2153 * Returns non-zero on failure.
2154 */
2155 static int ocfs2_prep_new_orphaned_file(struct inode *dir,
2156 struct buffer_head *dir_bh,
2157 char *orphan_name,
2158 struct inode **ret_orphan_dir,
2159 u64 *ret_di_blkno,
2160 struct ocfs2_dir_lookup_result *orphan_insert,
2161 struct ocfs2_alloc_context **ret_inode_ac)
2162 {
2163 int ret;
2164 u64 di_blkno;
2165 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2166 struct inode *orphan_dir = NULL;
2167 struct buffer_head *orphan_dir_bh = NULL;
2168 struct ocfs2_alloc_context *inode_ac = NULL;
2169
2170 ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh);
2171 if (ret < 0) {
2172 mlog_errno(ret);
2173 return ret;
2174 }
2175
2176 /* reserve an inode spot */
2177 ret = ocfs2_reserve_new_inode(osb, &inode_ac);
2178 if (ret < 0) {
2179 if (ret != -ENOSPC)
2180 mlog_errno(ret);
2181 goto out;
2182 }
2183
2184 ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
2185 &di_blkno);
2186 if (ret) {
2187 mlog_errno(ret);
2188 goto out;
2189 }
2190
2191 ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
2192 di_blkno, orphan_name, orphan_insert);
2193 if (ret < 0) {
2194 mlog_errno(ret);
2195 goto out;
2196 }
2197
2198 out:
2199 if (ret == 0) {
2200 *ret_orphan_dir = orphan_dir;
2201 *ret_di_blkno = di_blkno;
2202 *ret_inode_ac = inode_ac;
2203 /*
2204 * orphan_name and orphan_insert are already up to
2205 * date via prepare_orphan_dir
2206 */
2207 } else {
2208 /* Unroll reserve_new_inode* */
2209 if (inode_ac)
2210 ocfs2_free_alloc_context(inode_ac);
2211
2212 /* Unroll orphan dir locking */
2213 mutex_unlock(&orphan_dir->i_mutex);
2214 ocfs2_inode_unlock(orphan_dir, 1);
2215 iput(orphan_dir);
2216 }
2217
2218 brelse(orphan_dir_bh);
2219
2220 return 0;
2221 }
2222
2223 int ocfs2_create_inode_in_orphan(struct inode *dir,
2224 int mode,
2225 struct inode **new_inode)
2226 {
2227 int status, did_quota_inode = 0;
2228 struct inode *inode = NULL;
2229 struct inode *orphan_dir = NULL;
2230 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2231 struct ocfs2_dinode *di = NULL;
2232 handle_t *handle = NULL;
2233 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
2234 struct buffer_head *parent_di_bh = NULL;
2235 struct buffer_head *new_di_bh = NULL;
2236 struct ocfs2_alloc_context *inode_ac = NULL;
2237 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2238 u64 uninitialized_var(di_blkno), suballoc_loc;
2239 u16 suballoc_bit;
2240
2241 status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2242 if (status < 0) {
2243 if (status != -ENOENT)
2244 mlog_errno(status);
2245 return status;
2246 }
2247
2248 status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
2249 orphan_name, &orphan_dir,
2250 &di_blkno, &orphan_insert, &inode_ac);
2251 if (status < 0) {
2252 if (status != -ENOSPC)
2253 mlog_errno(status);
2254 goto leave;
2255 }
2256
2257 inode = ocfs2_get_init_inode(dir, mode);
2258 if (!inode) {
2259 status = -ENOMEM;
2260 mlog_errno(status);
2261 goto leave;
2262 }
2263
2264 handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
2265 if (IS_ERR(handle)) {
2266 status = PTR_ERR(handle);
2267 handle = NULL;
2268 mlog_errno(status);
2269 goto leave;
2270 }
2271
2272 status = dquot_alloc_inode(inode);
2273 if (status)
2274 goto leave;
2275 did_quota_inode = 1;
2276
2277 status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
2278 &suballoc_loc,
2279 &suballoc_bit, di_blkno);
2280 if (status < 0) {
2281 mlog_errno(status);
2282 goto leave;
2283 }
2284
2285 inode->i_nlink = 0;
2286 /* do the real work now. */
2287 status = __ocfs2_mknod_locked(dir, inode,
2288 0, &new_di_bh, parent_di_bh, handle,
2289 inode_ac, di_blkno, suballoc_loc,
2290 suballoc_bit);
2291 if (status < 0) {
2292 mlog_errno(status);
2293 goto leave;
2294 }
2295
2296 di = (struct ocfs2_dinode *)new_di_bh->b_data;
2297 status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
2298 &orphan_insert, orphan_dir);
2299 if (status < 0) {
2300 mlog_errno(status);
2301 goto leave;
2302 }
2303
2304 /* get open lock so that only nodes can't remove it from orphan dir. */
2305 status = ocfs2_open_lock(inode);
2306 if (status < 0)
2307 mlog_errno(status);
2308
2309 insert_inode_hash(inode);
2310 leave:
2311 if (status < 0 && did_quota_inode)
2312 dquot_free_inode(inode);
2313 if (handle)
2314 ocfs2_commit_trans(osb, handle);
2315
2316 if (orphan_dir) {
2317 /* This was locked for us in ocfs2_prepare_orphan_dir() */
2318 ocfs2_inode_unlock(orphan_dir, 1);
2319 mutex_unlock(&orphan_dir->i_mutex);
2320 iput(orphan_dir);
2321 }
2322
2323 if ((status < 0) && inode) {
2324 clear_nlink(inode);
2325 iput(inode);
2326 }
2327
2328 if (inode_ac)
2329 ocfs2_free_alloc_context(inode_ac);
2330
2331 brelse(new_di_bh);
2332
2333 if (!status)
2334 *new_inode = inode;
2335
2336 ocfs2_free_dir_lookup_result(&orphan_insert);
2337
2338 ocfs2_inode_unlock(dir, 1);
2339 brelse(parent_di_bh);
2340 return status;
2341 }
2342
2343 int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
2344 struct inode *inode,
2345 struct dentry *dentry)
2346 {
2347 int status = 0;
2348 struct buffer_head *parent_di_bh = NULL;
2349 handle_t *handle = NULL;
2350 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2351 struct ocfs2_dinode *dir_di, *di;
2352 struct inode *orphan_dir_inode = NULL;
2353 struct buffer_head *orphan_dir_bh = NULL;
2354 struct buffer_head *di_bh = NULL;
2355 struct ocfs2_dir_lookup_result lookup = { NULL, };
2356
2357 trace_ocfs2_mv_orphaned_inode_to_new(dir, dentry,
2358 dentry->d_name.len, dentry->d_name.name,
2359 (unsigned long long)OCFS2_I(dir)->ip_blkno,
2360 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2361
2362 status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2363 if (status < 0) {
2364 if (status != -ENOENT)
2365 mlog_errno(status);
2366 return status;
2367 }
2368
2369 dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
2370 if (!dir_di->i_links_count) {
2371 /* can't make a file in a deleted directory. */
2372 status = -ENOENT;
2373 goto leave;
2374 }
2375
2376 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
2377 dentry->d_name.len);
2378 if (status)
2379 goto leave;
2380
2381 /* get a spot inside the dir. */
2382 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_di_bh,
2383 dentry->d_name.name,
2384 dentry->d_name.len, &lookup);
2385 if (status < 0) {
2386 mlog_errno(status);
2387 goto leave;
2388 }
2389
2390 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2391 ORPHAN_DIR_SYSTEM_INODE,
2392 osb->slot_num);
2393 if (!orphan_dir_inode) {
2394 status = -EEXIST;
2395 mlog_errno(status);
2396 goto leave;
2397 }
2398
2399 mutex_lock(&orphan_dir_inode->i_mutex);
2400
2401 status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2402 if (status < 0) {
2403 mlog_errno(status);
2404 mutex_unlock(&orphan_dir_inode->i_mutex);
2405 iput(orphan_dir_inode);
2406 goto leave;
2407 }
2408
2409 status = ocfs2_read_inode_block(inode, &di_bh);
2410 if (status < 0) {
2411 mlog_errno(status);
2412 goto orphan_unlock;
2413 }
2414
2415 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
2416 if (IS_ERR(handle)) {
2417 status = PTR_ERR(handle);
2418 handle = NULL;
2419 mlog_errno(status);
2420 goto orphan_unlock;
2421 }
2422
2423 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
2424 di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2425 if (status < 0) {
2426 mlog_errno(status);
2427 goto out_commit;
2428 }
2429
2430 status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
2431 orphan_dir_bh);
2432 if (status < 0) {
2433 mlog_errno(status);
2434 goto out_commit;
2435 }
2436
2437 di = (struct ocfs2_dinode *)di_bh->b_data;
2438 le32_add_cpu(&di->i_flags, -OCFS2_ORPHANED_FL);
2439 di->i_orphaned_slot = 0;
2440 inode->i_nlink = 1;
2441 ocfs2_set_links_count(di, inode->i_nlink);
2442 ocfs2_journal_dirty(handle, di_bh);
2443
2444 status = ocfs2_add_entry(handle, dentry, inode,
2445 OCFS2_I(inode)->ip_blkno, parent_di_bh,
2446 &lookup);
2447 if (status < 0) {
2448 mlog_errno(status);
2449 goto out_commit;
2450 }
2451
2452 status = ocfs2_dentry_attach_lock(dentry, inode,
2453 OCFS2_I(dir)->ip_blkno);
2454 if (status) {
2455 mlog_errno(status);
2456 goto out_commit;
2457 }
2458
2459 d_instantiate(dentry, inode);
2460 status = 0;
2461 out_commit:
2462 ocfs2_commit_trans(osb, handle);
2463 orphan_unlock:
2464 ocfs2_inode_unlock(orphan_dir_inode, 1);
2465 mutex_unlock(&orphan_dir_inode->i_mutex);
2466 iput(orphan_dir_inode);
2467 leave:
2468
2469 ocfs2_inode_unlock(dir, 1);
2470
2471 brelse(di_bh);
2472 brelse(parent_di_bh);
2473 brelse(orphan_dir_bh);
2474
2475 ocfs2_free_dir_lookup_result(&lookup);
2476
2477 if (status)
2478 mlog_errno(status);
2479
2480 return status;
2481 }
2482
2483 const struct inode_operations ocfs2_dir_iops = {
2484 .create = ocfs2_create,
2485 .lookup = ocfs2_lookup,
2486 .link = ocfs2_link,
2487 .unlink = ocfs2_unlink,
2488 .rmdir = ocfs2_unlink,
2489 .symlink = ocfs2_symlink,
2490 .mkdir = ocfs2_mkdir,
2491 .mknod = ocfs2_mknod,
2492 .rename = ocfs2_rename,
2493 .setattr = ocfs2_setattr,
2494 .getattr = ocfs2_getattr,
2495 .permission = ocfs2_permission,
2496 .setxattr = generic_setxattr,
2497 .getxattr = generic_getxattr,
2498 .listxattr = ocfs2_listxattr,
2499 .removexattr = generic_removexattr,
2500 .fiemap = ocfs2_fiemap,
2501 .get_acl = ocfs2_iop_get_acl,
2502 };
linux-next