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Linux 3.16-rc2
[linux/fpc-iii.git] / fs / ocfs2 / namei.c
blob2060fc398445a259d17167d43b97fed4ba7357ab
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.value);
454
455 ocfs2_free_dir_lookup_result(&lookup);
456
457 if (inode_ac)
458 ocfs2_free_alloc_context(inode_ac);
459
460 if (data_ac)
461 ocfs2_free_alloc_context(data_ac);
462
463 if (meta_ac)
464 ocfs2_free_alloc_context(meta_ac);
465
466 /*
467 * We should call iput after the i_mutex of the bitmap been
468 * unlocked in ocfs2_free_alloc_context, or the
469 * ocfs2_delete_inode will mutex_lock again.
470 */
471 if ((status < 0) && inode) {
472 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
473 clear_nlink(inode);
474 iput(inode);
475 }
476
477 if (status)
478 mlog_errno(status);
479
480 return status;
481 }
482
483 static int __ocfs2_mknod_locked(struct inode *dir,
484 struct inode *inode,
485 dev_t dev,
486 struct buffer_head **new_fe_bh,
487 struct buffer_head *parent_fe_bh,
488 handle_t *handle,
489 struct ocfs2_alloc_context *inode_ac,
490 u64 fe_blkno, u64 suballoc_loc, u16 suballoc_bit)
491 {
492 int status = 0;
493 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
494 struct ocfs2_dinode *fe = NULL;
495 struct ocfs2_extent_list *fel;
496 u16 feat;
497 struct ocfs2_inode_info *oi = OCFS2_I(inode);
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 oi->i_sync_tid = handle->h_transaction->t_tid;
580 oi->i_datasync_tid = handle->h_transaction->t_tid;
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 u64 old_de_ino;
668
669 trace_ocfs2_link((unsigned long long)OCFS2_I(inode)->ip_blkno,
670 old_dentry->d_name.len, old_dentry->d_name.name,
671 dentry->d_name.len, dentry->d_name.name);
672
673 if (S_ISDIR(inode->i_mode))
674 return -EPERM;
675
676 dquot_initialize(dir);
677
678 err = ocfs2_inode_lock_nested(dir, &parent_fe_bh, 1, OI_LS_PARENT);
679 if (err < 0) {
680 if (err != -ENOENT)
681 mlog_errno(err);
682 return err;
683 }
684
685 if (!dir->i_nlink) {
686 err = -ENOENT;
687 goto out;
688 }
689
690 err = ocfs2_lookup_ino_from_name(dir, old_dentry->d_name.name,
691 old_dentry->d_name.len, &old_de_ino);
692 if (err) {
693 err = -ENOENT;
694 goto out;
695 }
696
697 /*
698 * Check whether another node removed the source inode while we
699 * were in the vfs.
700 */
701 if (old_de_ino != OCFS2_I(inode)->ip_blkno) {
702 err = -ENOENT;
703 goto out;
704 }
705
706 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
707 dentry->d_name.len);
708 if (err)
709 goto out;
710
711 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
712 dentry->d_name.name,
713 dentry->d_name.len, &lookup);
714 if (err < 0) {
715 mlog_errno(err);
716 goto out;
717 }
718
719 err = ocfs2_inode_lock(inode, &fe_bh, 1);
720 if (err < 0) {
721 if (err != -ENOENT)
722 mlog_errno(err);
723 goto out;
724 }
725
726 fe = (struct ocfs2_dinode *) fe_bh->b_data;
727 if (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) {
728 err = -EMLINK;
729 goto out_unlock_inode;
730 }
731
732 handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb));
733 if (IS_ERR(handle)) {
734 err = PTR_ERR(handle);
735 handle = NULL;
736 mlog_errno(err);
737 goto out_unlock_inode;
738 }
739
740 /* Starting to change things, restart is no longer possible. */
741 ocfs2_block_signals(&oldset);
742
743 err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
744 OCFS2_JOURNAL_ACCESS_WRITE);
745 if (err < 0) {
746 mlog_errno(err);
747 goto out_commit;
748 }
749
750 inc_nlink(inode);
751 inode->i_ctime = CURRENT_TIME;
752 ocfs2_set_links_count(fe, inode->i_nlink);
753 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
754 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
755 ocfs2_journal_dirty(handle, fe_bh);
756
757 err = ocfs2_add_entry(handle, dentry, inode,
758 OCFS2_I(inode)->ip_blkno,
759 parent_fe_bh, &lookup);
760 if (err) {
761 ocfs2_add_links_count(fe, -1);
762 drop_nlink(inode);
763 mlog_errno(err);
764 goto out_commit;
765 }
766
767 err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
768 if (err) {
769 mlog_errno(err);
770 goto out_commit;
771 }
772
773 ihold(inode);
774 d_instantiate(dentry, inode);
775
776 out_commit:
777 ocfs2_commit_trans(osb, handle);
778 ocfs2_unblock_signals(&oldset);
779 out_unlock_inode:
780 ocfs2_inode_unlock(inode, 1);
781
782 out:
783 ocfs2_inode_unlock(dir, 1);
784
785 brelse(fe_bh);
786 brelse(parent_fe_bh);
787
788 ocfs2_free_dir_lookup_result(&lookup);
789
790 if (err)
791 mlog_errno(err);
792
793 return err;
794 }
795
796 /*
797 * Takes and drops an exclusive lock on the given dentry. This will
798 * force other nodes to drop it.
799 */
800 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
801 {
802 int ret;
803
804 ret = ocfs2_dentry_lock(dentry, 1);
805 if (ret)
806 mlog_errno(ret);
807 else
808 ocfs2_dentry_unlock(dentry, 1);
809
810 return ret;
811 }
812
813 static inline int ocfs2_inode_is_unlinkable(struct inode *inode)
814 {
815 if (S_ISDIR(inode->i_mode)) {
816 if (inode->i_nlink == 2)
817 return 1;
818 return 0;
819 }
820
821 if (inode->i_nlink == 1)
822 return 1;
823 return 0;
824 }
825
826 static int ocfs2_unlink(struct inode *dir,
827 struct dentry *dentry)
828 {
829 int status;
830 int child_locked = 0;
831 bool is_unlinkable = false;
832 struct inode *inode = dentry->d_inode;
833 struct inode *orphan_dir = NULL;
834 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
835 u64 blkno;
836 struct ocfs2_dinode *fe = NULL;
837 struct buffer_head *fe_bh = NULL;
838 struct buffer_head *parent_node_bh = NULL;
839 handle_t *handle = NULL;
840 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
841 struct ocfs2_dir_lookup_result lookup = { NULL, };
842 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
843
844 trace_ocfs2_unlink(dir, dentry, dentry->d_name.len,
845 dentry->d_name.name,
846 (unsigned long long)OCFS2_I(dir)->ip_blkno,
847 (unsigned long long)OCFS2_I(inode)->ip_blkno);
848
849 dquot_initialize(dir);
850
851 BUG_ON(dentry->d_parent->d_inode != dir);
852
853 if (inode == osb->root_inode)
854 return -EPERM;
855
856 status = ocfs2_inode_lock_nested(dir, &parent_node_bh, 1,
857 OI_LS_PARENT);
858 if (status < 0) {
859 if (status != -ENOENT)
860 mlog_errno(status);
861 return status;
862 }
863
864 status = ocfs2_find_files_on_disk(dentry->d_name.name,
865 dentry->d_name.len, &blkno, dir,
866 &lookup);
867 if (status < 0) {
868 if (status != -ENOENT)
869 mlog_errno(status);
870 goto leave;
871 }
872
873 if (OCFS2_I(inode)->ip_blkno != blkno) {
874 status = -ENOENT;
875
876 trace_ocfs2_unlink_noent(
877 (unsigned long long)OCFS2_I(inode)->ip_blkno,
878 (unsigned long long)blkno,
879 OCFS2_I(inode)->ip_flags);
880 goto leave;
881 }
882
883 status = ocfs2_inode_lock(inode, &fe_bh, 1);
884 if (status < 0) {
885 if (status != -ENOENT)
886 mlog_errno(status);
887 goto leave;
888 }
889 child_locked = 1;
890
891 if (S_ISDIR(inode->i_mode)) {
892 if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
893 status = -ENOTEMPTY;
894 goto leave;
895 }
896 }
897
898 status = ocfs2_remote_dentry_delete(dentry);
899 if (status < 0) {
900 /* This remote delete should succeed under all normal
901 * circumstances. */
902 mlog_errno(status);
903 goto leave;
904 }
905
906 if (ocfs2_inode_is_unlinkable(inode)) {
907 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
908 OCFS2_I(inode)->ip_blkno,
909 orphan_name, &orphan_insert);
910 if (status < 0) {
911 mlog_errno(status);
912 goto leave;
913 }
914 is_unlinkable = true;
915 }
916
917 handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb));
918 if (IS_ERR(handle)) {
919 status = PTR_ERR(handle);
920 handle = NULL;
921 mlog_errno(status);
922 goto leave;
923 }
924
925 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
926 OCFS2_JOURNAL_ACCESS_WRITE);
927 if (status < 0) {
928 mlog_errno(status);
929 goto leave;
930 }
931
932 fe = (struct ocfs2_dinode *) fe_bh->b_data;
933
934 /* delete the name from the parent dir */
935 status = ocfs2_delete_entry(handle, dir, &lookup);
936 if (status < 0) {
937 mlog_errno(status);
938 goto leave;
939 }
940
941 if (S_ISDIR(inode->i_mode))
942 drop_nlink(inode);
943 drop_nlink(inode);
944 ocfs2_set_links_count(fe, inode->i_nlink);
945 ocfs2_journal_dirty(handle, fe_bh);
946
947 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
948 if (S_ISDIR(inode->i_mode))
949 drop_nlink(dir);
950
951 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
952 if (status < 0) {
953 mlog_errno(status);
954 if (S_ISDIR(inode->i_mode))
955 inc_nlink(dir);
956 goto leave;
957 }
958
959 if (is_unlinkable) {
960 status = ocfs2_orphan_add(osb, handle, inode, fe_bh,
961 orphan_name, &orphan_insert, orphan_dir);
962 if (status < 0)
963 mlog_errno(status);
964 }
965
966 leave:
967 if (handle)
968 ocfs2_commit_trans(osb, handle);
969
970 if (child_locked)
971 ocfs2_inode_unlock(inode, 1);
972
973 ocfs2_inode_unlock(dir, 1);
974
975 if (orphan_dir) {
976 /* This was locked for us in ocfs2_prepare_orphan_dir() */
977 ocfs2_inode_unlock(orphan_dir, 1);
978 mutex_unlock(&orphan_dir->i_mutex);
979 iput(orphan_dir);
980 }
981
982 brelse(fe_bh);
983 brelse(parent_node_bh);
984
985 ocfs2_free_dir_lookup_result(&orphan_insert);
986 ocfs2_free_dir_lookup_result(&lookup);
987
988 if (status && (status != -ENOTEMPTY) && (status != -ENOENT))
989 mlog_errno(status);
990
991 return status;
992 }
993
994 /*
995 * The only place this should be used is rename!
996 * if they have the same id, then the 1st one is the only one locked.
997 */
998 static int ocfs2_double_lock(struct ocfs2_super *osb,
999 struct buffer_head **bh1,
1000 struct inode *inode1,
1001 struct buffer_head **bh2,
1002 struct inode *inode2)
1003 {
1004 int status;
1005 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
1006 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
1007 struct buffer_head **tmpbh;
1008 struct inode *tmpinode;
1009
1010 trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno,
1011 (unsigned long long)oi2->ip_blkno);
1012
1013 if (*bh1)
1014 *bh1 = NULL;
1015 if (*bh2)
1016 *bh2 = NULL;
1017
1018 /* we always want to lock the one with the lower lockid first. */
1019 if (oi1->ip_blkno != oi2->ip_blkno) {
1020 if (oi1->ip_blkno < oi2->ip_blkno) {
1021 /* switch id1 and id2 around */
1022 tmpbh = bh2;
1023 bh2 = bh1;
1024 bh1 = tmpbh;
1025
1026 tmpinode = inode2;
1027 inode2 = inode1;
1028 inode1 = tmpinode;
1029 }
1030 /* lock id2 */
1031 status = ocfs2_inode_lock_nested(inode2, bh2, 1,
1032 OI_LS_RENAME1);
1033 if (status < 0) {
1034 if (status != -ENOENT)
1035 mlog_errno(status);
1036 goto bail;
1037 }
1038 }
1039
1040 /* lock id1 */
1041 status = ocfs2_inode_lock_nested(inode1, bh1, 1, OI_LS_RENAME2);
1042 if (status < 0) {
1043 /*
1044 * An error return must mean that no cluster locks
1045 * were held on function exit.
1046 */
1047 if (oi1->ip_blkno != oi2->ip_blkno) {
1048 ocfs2_inode_unlock(inode2, 1);
1049 brelse(*bh2);
1050 *bh2 = NULL;
1051 }
1052
1053 if (status != -ENOENT)
1054 mlog_errno(status);
1055 }
1056
1057 trace_ocfs2_double_lock_end(
1058 (unsigned long long)OCFS2_I(inode1)->ip_blkno,
1059 (unsigned long long)OCFS2_I(inode2)->ip_blkno);
1060
1061 bail:
1062 if (status)
1063 mlog_errno(status);
1064 return status;
1065 }
1066
1067 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1068 {
1069 ocfs2_inode_unlock(inode1, 1);
1070
1071 if (inode1 != inode2)
1072 ocfs2_inode_unlock(inode2, 1);
1073 }
1074
1075 static int ocfs2_rename(struct inode *old_dir,
1076 struct dentry *old_dentry,
1077 struct inode *new_dir,
1078 struct dentry *new_dentry)
1079 {
1080 int status = 0, rename_lock = 0, parents_locked = 0, target_exists = 0;
1081 int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 0;
1082 struct inode *old_inode = old_dentry->d_inode;
1083 struct inode *new_inode = new_dentry->d_inode;
1084 struct inode *orphan_dir = NULL;
1085 struct ocfs2_dinode *newfe = NULL;
1086 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1087 struct buffer_head *newfe_bh = NULL;
1088 struct buffer_head *old_inode_bh = NULL;
1089 struct ocfs2_super *osb = NULL;
1090 u64 newfe_blkno, old_de_ino;
1091 handle_t *handle = NULL;
1092 struct buffer_head *old_dir_bh = NULL;
1093 struct buffer_head *new_dir_bh = NULL;
1094 u32 old_dir_nlink = old_dir->i_nlink;
1095 struct ocfs2_dinode *old_di;
1096 struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
1097 struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
1098 struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
1099 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
1100 struct ocfs2_dir_lookup_result target_insert = { NULL, };
1101
1102 /* At some point it might be nice to break this function up a
1103 * bit. */
1104
1105 trace_ocfs2_rename(old_dir, old_dentry, new_dir, new_dentry,
1106 old_dentry->d_name.len, old_dentry->d_name.name,
1107 new_dentry->d_name.len, new_dentry->d_name.name);
1108
1109 dquot_initialize(old_dir);
1110 dquot_initialize(new_dir);
1111
1112 osb = OCFS2_SB(old_dir->i_sb);
1113
1114 if (new_inode) {
1115 if (!igrab(new_inode))
1116 BUG();
1117 }
1118
1119 /* Assume a directory hierarchy thusly:
1120 * a/b/c
1121 * a/d
1122 * a,b,c, and d are all directories.
1123 *
1124 * from cwd of 'a' on both nodes:
1125 * node1: mv b/c d
1126 * node2: mv d b/c
1127 *
1128 * And that's why, just like the VFS, we need a file system
1129 * rename lock. */
1130 if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
1131 status = ocfs2_rename_lock(osb);
1132 if (status < 0) {
1133 mlog_errno(status);
1134 goto bail;
1135 }
1136 rename_lock = 1;
1137 }
1138
1139 /* if old and new are the same, this'll just do one lock. */
1140 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1141 &new_dir_bh, new_dir);
1142 if (status < 0) {
1143 mlog_errno(status);
1144 goto bail;
1145 }
1146 parents_locked = 1;
1147
1148 /* make sure both dirs have bhs
1149 * get an extra ref on old_dir_bh if old==new */
1150 if (!new_dir_bh) {
1151 if (old_dir_bh) {
1152 new_dir_bh = old_dir_bh;
1153 get_bh(new_dir_bh);
1154 } else {
1155 mlog(ML_ERROR, "no old_dir_bh!\n");
1156 status = -EIO;
1157 goto bail;
1158 }
1159 }
1160
1161 /*
1162 * Aside from allowing a meta data update, the locking here
1163 * also ensures that the downconvert thread on other nodes
1164 * won't have to concurrently downconvert the inode and the
1165 * dentry locks.
1166 */
1167 status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
1168 OI_LS_PARENT);
1169 if (status < 0) {
1170 if (status != -ENOENT)
1171 mlog_errno(status);
1172 goto bail;
1173 }
1174 old_child_locked = 1;
1175
1176 status = ocfs2_remote_dentry_delete(old_dentry);
1177 if (status < 0) {
1178 mlog_errno(status);
1179 goto bail;
1180 }
1181
1182 if (S_ISDIR(old_inode->i_mode)) {
1183 u64 old_inode_parent;
1184
1185 update_dot_dot = 1;
1186 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1187 old_inode,
1188 &old_inode_dot_dot_res);
1189 if (status) {
1190 status = -EIO;
1191 goto bail;
1192 }
1193
1194 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1195 status = -EIO;
1196 goto bail;
1197 }
1198
1199 if (!new_inode && new_dir != old_dir &&
1200 new_dir->i_nlink >= ocfs2_link_max(osb)) {
1201 status = -EMLINK;
1202 goto bail;
1203 }
1204 }
1205
1206 status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1207 old_dentry->d_name.len,
1208 &old_de_ino);
1209 if (status) {
1210 status = -ENOENT;
1211 goto bail;
1212 }
1213
1214 /*
1215 * Check for inode number is _not_ due to possible IO errors.
1216 * We might rmdir the source, keep it as pwd of some process
1217 * and merrily kill the link to whatever was created under the
1218 * same name. Goodbye sticky bit ;-<
1219 */
1220 if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1221 status = -ENOENT;
1222 goto bail;
1223 }
1224
1225 /* check if the target already exists (in which case we need
1226 * to delete it */
1227 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1228 new_dentry->d_name.len,
1229 &newfe_blkno, new_dir,
1230 &target_lookup_res);
1231 /* The only error we allow here is -ENOENT because the new
1232 * file not existing is perfectly valid. */
1233 if ((status < 0) && (status != -ENOENT)) {
1234 /* If we cannot find the file specified we should just */
1235 /* return the error... */
1236 mlog_errno(status);
1237 goto bail;
1238 }
1239 if (status == 0)
1240 target_exists = 1;
1241
1242 if (!target_exists && new_inode) {
1243 /*
1244 * Target was unlinked by another node while we were
1245 * waiting to get to ocfs2_rename(). There isn't
1246 * anything we can do here to help the situation, so
1247 * bubble up the appropriate error.
1248 */
1249 status = -ENOENT;
1250 goto bail;
1251 }
1252
1253 /* In case we need to overwrite an existing file, we blow it
1254 * away first */
1255 if (target_exists) {
1256 /* VFS didn't think there existed an inode here, but
1257 * someone else in the cluster must have raced our
1258 * rename to create one. Today we error cleanly, in
1259 * the future we should consider calling iget to build
1260 * a new struct inode for this entry. */
1261 if (!new_inode) {
1262 status = -EACCES;
1263
1264 trace_ocfs2_rename_target_exists(new_dentry->d_name.len,
1265 new_dentry->d_name.name);
1266 goto bail;
1267 }
1268
1269 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1270 status = -EACCES;
1271
1272 trace_ocfs2_rename_disagree(
1273 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1274 (unsigned long long)newfe_blkno,
1275 OCFS2_I(new_inode)->ip_flags);
1276 goto bail;
1277 }
1278
1279 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1280 if (status < 0) {
1281 if (status != -ENOENT)
1282 mlog_errno(status);
1283 goto bail;
1284 }
1285 new_child_locked = 1;
1286
1287 status = ocfs2_remote_dentry_delete(new_dentry);
1288 if (status < 0) {
1289 mlog_errno(status);
1290 goto bail;
1291 }
1292
1293 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1294
1295 trace_ocfs2_rename_over_existing(
1296 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1297 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1298
1299 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1300 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1301 OCFS2_I(new_inode)->ip_blkno,
1302 orphan_name, &orphan_insert);
1303 if (status < 0) {
1304 mlog_errno(status);
1305 goto bail;
1306 }
1307 }
1308 } else {
1309 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1310
1311 status = ocfs2_check_dir_for_entry(new_dir,
1312 new_dentry->d_name.name,
1313 new_dentry->d_name.len);
1314 if (status)
1315 goto bail;
1316
1317 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1318 new_dentry->d_name.name,
1319 new_dentry->d_name.len,
1320 &target_insert);
1321 if (status < 0) {
1322 mlog_errno(status);
1323 goto bail;
1324 }
1325 }
1326
1327 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
1328 if (IS_ERR(handle)) {
1329 status = PTR_ERR(handle);
1330 handle = NULL;
1331 mlog_errno(status);
1332 goto bail;
1333 }
1334
1335 if (target_exists) {
1336 if (S_ISDIR(new_inode->i_mode)) {
1337 if (new_inode->i_nlink != 2 ||
1338 !ocfs2_empty_dir(new_inode)) {
1339 status = -ENOTEMPTY;
1340 goto bail;
1341 }
1342 }
1343 status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
1344 newfe_bh,
1345 OCFS2_JOURNAL_ACCESS_WRITE);
1346 if (status < 0) {
1347 mlog_errno(status);
1348 goto bail;
1349 }
1350
1351 if (S_ISDIR(new_inode->i_mode) ||
1352 (ocfs2_read_links_count(newfe) == 1)) {
1353 status = ocfs2_orphan_add(osb, handle, new_inode,
1354 newfe_bh, orphan_name,
1355 &orphan_insert, orphan_dir);
1356 if (status < 0) {
1357 mlog_errno(status);
1358 goto bail;
1359 }
1360 }
1361
1362 /* change the dirent to point to the correct inode */
1363 status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
1364 old_inode);
1365 if (status < 0) {
1366 mlog_errno(status);
1367 goto bail;
1368 }
1369 new_dir->i_version++;
1370
1371 if (S_ISDIR(new_inode->i_mode))
1372 ocfs2_set_links_count(newfe, 0);
1373 else
1374 ocfs2_add_links_count(newfe, -1);
1375 ocfs2_journal_dirty(handle, newfe_bh);
1376 } else {
1377 /* if the name was not found in new_dir, add it now */
1378 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1379 OCFS2_I(old_inode)->ip_blkno,
1380 new_dir_bh, &target_insert);
1381 }
1382
1383 old_inode->i_ctime = CURRENT_TIME;
1384 mark_inode_dirty(old_inode);
1385
1386 status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode),
1387 old_inode_bh,
1388 OCFS2_JOURNAL_ACCESS_WRITE);
1389 if (status >= 0) {
1390 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1391
1392 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1393 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1394 ocfs2_journal_dirty(handle, old_inode_bh);
1395 } else
1396 mlog_errno(status);
1397
1398 /*
1399 * Now that the name has been added to new_dir, remove the old name.
1400 *
1401 * We don't keep any directory entry context around until now
1402 * because the insert might have changed the type of directory
1403 * we're dealing with.
1404 */
1405 status = ocfs2_find_entry(old_dentry->d_name.name,
1406 old_dentry->d_name.len, old_dir,
1407 &old_entry_lookup);
1408 if (status)
1409 goto bail;
1410
1411 status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
1412 if (status < 0) {
1413 mlog_errno(status);
1414 goto bail;
1415 }
1416
1417 if (new_inode) {
1418 drop_nlink(new_inode);
1419 new_inode->i_ctime = CURRENT_TIME;
1420 }
1421 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1422
1423 if (update_dot_dot) {
1424 status = ocfs2_update_entry(old_inode, handle,
1425 &old_inode_dot_dot_res, new_dir);
1426 drop_nlink(old_dir);
1427 if (new_inode) {
1428 drop_nlink(new_inode);
1429 } else {
1430 inc_nlink(new_dir);
1431 mark_inode_dirty(new_dir);
1432 }
1433 }
1434 mark_inode_dirty(old_dir);
1435 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1436 if (new_inode) {
1437 mark_inode_dirty(new_inode);
1438 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1439 }
1440
1441 if (old_dir != new_dir) {
1442 /* Keep the same times on both directories.*/
1443 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1444
1445 /*
1446 * This will also pick up the i_nlink change from the
1447 * block above.
1448 */
1449 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1450 }
1451
1452 if (old_dir_nlink != old_dir->i_nlink) {
1453 if (!old_dir_bh) {
1454 mlog(ML_ERROR, "need to change nlink for old dir "
1455 "%llu from %d to %d but bh is NULL!\n",
1456 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1457 (int)old_dir_nlink, old_dir->i_nlink);
1458 } else {
1459 struct ocfs2_dinode *fe;
1460 status = ocfs2_journal_access_di(handle,
1461 INODE_CACHE(old_dir),
1462 old_dir_bh,
1463 OCFS2_JOURNAL_ACCESS_WRITE);
1464 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1465 ocfs2_set_links_count(fe, old_dir->i_nlink);
1466 ocfs2_journal_dirty(handle, old_dir_bh);
1467 }
1468 }
1469 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1470 status = 0;
1471 bail:
1472 if (rename_lock)
1473 ocfs2_rename_unlock(osb);
1474
1475 if (handle)
1476 ocfs2_commit_trans(osb, handle);
1477
1478 if (parents_locked)
1479 ocfs2_double_unlock(old_dir, new_dir);
1480
1481 if (old_child_locked)
1482 ocfs2_inode_unlock(old_inode, 1);
1483
1484 if (new_child_locked)
1485 ocfs2_inode_unlock(new_inode, 1);
1486
1487 if (orphan_dir) {
1488 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1489 ocfs2_inode_unlock(orphan_dir, 1);
1490 mutex_unlock(&orphan_dir->i_mutex);
1491 iput(orphan_dir);
1492 }
1493
1494 if (new_inode)
1495 sync_mapping_buffers(old_inode->i_mapping);
1496
1497 if (new_inode)
1498 iput(new_inode);
1499
1500 ocfs2_free_dir_lookup_result(&target_lookup_res);
1501 ocfs2_free_dir_lookup_result(&old_entry_lookup);
1502 ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
1503 ocfs2_free_dir_lookup_result(&orphan_insert);
1504 ocfs2_free_dir_lookup_result(&target_insert);
1505
1506 brelse(newfe_bh);
1507 brelse(old_inode_bh);
1508 brelse(old_dir_bh);
1509 brelse(new_dir_bh);
1510
1511 if (status)
1512 mlog_errno(status);
1513
1514 return status;
1515 }
1516
1517 /*
1518 * we expect i_size = strlen(symname). Copy symname into the file
1519 * data, including the null terminator.
1520 */
1521 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1522 handle_t *handle,
1523 struct inode *inode,
1524 const char *symname)
1525 {
1526 struct buffer_head **bhs = NULL;
1527 const char *c;
1528 struct super_block *sb = osb->sb;
1529 u64 p_blkno, p_blocks;
1530 int virtual, blocks, status, i, bytes_left;
1531
1532 bytes_left = i_size_read(inode) + 1;
1533 /* we can't trust i_blocks because we're actually going to
1534 * write i_size + 1 bytes. */
1535 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1536
1537 trace_ocfs2_create_symlink_data((unsigned long long)inode->i_blocks,
1538 i_size_read(inode), blocks);
1539
1540 /* Sanity check -- make sure we're going to fit. */
1541 if (bytes_left >
1542 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1543 status = -EIO;
1544 mlog_errno(status);
1545 goto bail;
1546 }
1547
1548 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1549 if (!bhs) {
1550 status = -ENOMEM;
1551 mlog_errno(status);
1552 goto bail;
1553 }
1554
1555 status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1556 NULL);
1557 if (status < 0) {
1558 mlog_errno(status);
1559 goto bail;
1560 }
1561
1562 /* links can never be larger than one cluster so we know this
1563 * is all going to be contiguous, but do a sanity check
1564 * anyway. */
1565 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1566 status = -EIO;
1567 mlog_errno(status);
1568 goto bail;
1569 }
1570
1571 virtual = 0;
1572 while(bytes_left > 0) {
1573 c = &symname[virtual * sb->s_blocksize];
1574
1575 bhs[virtual] = sb_getblk(sb, p_blkno);
1576 if (!bhs[virtual]) {
1577 status = -ENOMEM;
1578 mlog_errno(status);
1579 goto bail;
1580 }
1581 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode),
1582 bhs[virtual]);
1583
1584 status = ocfs2_journal_access(handle, INODE_CACHE(inode),
1585 bhs[virtual],
1586 OCFS2_JOURNAL_ACCESS_CREATE);
1587 if (status < 0) {
1588 mlog_errno(status);
1589 goto bail;
1590 }
1591
1592 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1593
1594 memcpy(bhs[virtual]->b_data, c,
1595 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1596 bytes_left);
1597
1598 ocfs2_journal_dirty(handle, bhs[virtual]);
1599
1600 virtual++;
1601 p_blkno++;
1602 bytes_left -= sb->s_blocksize;
1603 }
1604
1605 status = 0;
1606 bail:
1607
1608 if (bhs) {
1609 for(i = 0; i < blocks; i++)
1610 brelse(bhs[i]);
1611 kfree(bhs);
1612 }
1613
1614 if (status)
1615 mlog_errno(status);
1616 return status;
1617 }
1618
1619 static int ocfs2_symlink(struct inode *dir,
1620 struct dentry *dentry,
1621 const char *symname)
1622 {
1623 int status, l, credits;
1624 u64 newsize;
1625 struct ocfs2_super *osb = NULL;
1626 struct inode *inode = NULL;
1627 struct super_block *sb;
1628 struct buffer_head *new_fe_bh = NULL;
1629 struct buffer_head *parent_fe_bh = NULL;
1630 struct ocfs2_dinode *fe = NULL;
1631 struct ocfs2_dinode *dirfe;
1632 handle_t *handle = NULL;
1633 struct ocfs2_alloc_context *inode_ac = NULL;
1634 struct ocfs2_alloc_context *data_ac = NULL;
1635 struct ocfs2_alloc_context *xattr_ac = NULL;
1636 int want_clusters = 0;
1637 int xattr_credits = 0;
1638 struct ocfs2_security_xattr_info si = {
1639 .enable = 1,
1640 };
1641 int did_quota = 0, did_quota_inode = 0;
1642 struct ocfs2_dir_lookup_result lookup = { NULL, };
1643 sigset_t oldset;
1644 int did_block_signals = 0;
1645
1646 trace_ocfs2_symlink_begin(dir, dentry, symname,
1647 dentry->d_name.len, dentry->d_name.name);
1648
1649 dquot_initialize(dir);
1650
1651 sb = dir->i_sb;
1652 osb = OCFS2_SB(sb);
1653
1654 l = strlen(symname) + 1;
1655
1656 credits = ocfs2_calc_symlink_credits(sb);
1657
1658 /* lock the parent directory */
1659 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1660 if (status < 0) {
1661 if (status != -ENOENT)
1662 mlog_errno(status);
1663 return status;
1664 }
1665
1666 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1667 if (!ocfs2_read_links_count(dirfe)) {
1668 /* can't make a file in a deleted directory. */
1669 status = -ENOENT;
1670 goto bail;
1671 }
1672
1673 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1674 dentry->d_name.len);
1675 if (status)
1676 goto bail;
1677
1678 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1679 dentry->d_name.name,
1680 dentry->d_name.len, &lookup);
1681 if (status < 0) {
1682 mlog_errno(status);
1683 goto bail;
1684 }
1685
1686 status = ocfs2_reserve_new_inode(osb, &inode_ac);
1687 if (status < 0) {
1688 if (status != -ENOSPC)
1689 mlog_errno(status);
1690 goto bail;
1691 }
1692
1693 inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
1694 if (!inode) {
1695 status = -ENOMEM;
1696 mlog_errno(status);
1697 goto bail;
1698 }
1699
1700 /* get security xattr */
1701 status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
1702 if (status) {
1703 if (status == -EOPNOTSUPP)
1704 si.enable = 0;
1705 else {
1706 mlog_errno(status);
1707 goto bail;
1708 }
1709 }
1710
1711 /* calculate meta data/clusters for setting security xattr */
1712 if (si.enable) {
1713 status = ocfs2_calc_security_init(dir, &si, &want_clusters,
1714 &xattr_credits, &xattr_ac);
1715 if (status < 0) {
1716 mlog_errno(status);
1717 goto bail;
1718 }
1719 }
1720
1721 /* don't reserve bitmap space for fast symlinks. */
1722 if (l > ocfs2_fast_symlink_chars(sb))
1723 want_clusters += 1;
1724
1725 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
1726 if (status < 0) {
1727 if (status != -ENOSPC)
1728 mlog_errno(status);
1729 goto bail;
1730 }
1731
1732 handle = ocfs2_start_trans(osb, credits + xattr_credits);
1733 if (IS_ERR(handle)) {
1734 status = PTR_ERR(handle);
1735 handle = NULL;
1736 mlog_errno(status);
1737 goto bail;
1738 }
1739
1740 /* Starting to change things, restart is no longer possible. */
1741 ocfs2_block_signals(&oldset);
1742 did_block_signals = 1;
1743
1744 status = dquot_alloc_inode(inode);
1745 if (status)
1746 goto bail;
1747 did_quota_inode = 1;
1748
1749 trace_ocfs2_symlink_create(dir, dentry, dentry->d_name.len,
1750 dentry->d_name.name,
1751 (unsigned long long)OCFS2_I(dir)->ip_blkno,
1752 inode->i_mode);
1753
1754 status = ocfs2_mknod_locked(osb, dir, inode,
1755 0, &new_fe_bh, parent_fe_bh, handle,
1756 inode_ac);
1757 if (status < 0) {
1758 mlog_errno(status);
1759 goto bail;
1760 }
1761
1762 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1763 inode->i_rdev = 0;
1764 newsize = l - 1;
1765 inode->i_op = &ocfs2_symlink_inode_operations;
1766 if (l > ocfs2_fast_symlink_chars(sb)) {
1767 u32 offset = 0;
1768
1769 status = dquot_alloc_space_nodirty(inode,
1770 ocfs2_clusters_to_bytes(osb->sb, 1));
1771 if (status)
1772 goto bail;
1773 did_quota = 1;
1774 inode->i_mapping->a_ops = &ocfs2_aops;
1775 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
1776 new_fe_bh,
1777 handle, data_ac, NULL,
1778 NULL);
1779 if (status < 0) {
1780 if (status != -ENOSPC && status != -EINTR) {
1781 mlog(ML_ERROR,
1782 "Failed to extend file to %llu\n",
1783 (unsigned long long)newsize);
1784 mlog_errno(status);
1785 status = -ENOSPC;
1786 }
1787 goto bail;
1788 }
1789 i_size_write(inode, newsize);
1790 inode->i_blocks = ocfs2_inode_sector_count(inode);
1791 } else {
1792 inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
1793 memcpy((char *) fe->id2.i_symlink, symname, l);
1794 i_size_write(inode, newsize);
1795 inode->i_blocks = 0;
1796 }
1797
1798 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1799 if (status < 0) {
1800 mlog_errno(status);
1801 goto bail;
1802 }
1803
1804 if (!ocfs2_inode_is_fast_symlink(inode)) {
1805 status = ocfs2_create_symlink_data(osb, handle, inode,
1806 symname);
1807 if (status < 0) {
1808 mlog_errno(status);
1809 goto bail;
1810 }
1811 }
1812
1813 if (si.enable) {
1814 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
1815 xattr_ac, data_ac);
1816 if (status < 0) {
1817 mlog_errno(status);
1818 goto bail;
1819 }
1820 }
1821
1822 /*
1823 * Do this before adding the entry to the directory. We add
1824 * also set d_op after success so that ->d_iput() will cleanup
1825 * the dentry lock even if ocfs2_add_entry() fails below.
1826 */
1827 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1828 if (status) {
1829 mlog_errno(status);
1830 goto bail;
1831 }
1832
1833 status = ocfs2_add_entry(handle, dentry, inode,
1834 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1835 &lookup);
1836 if (status < 0) {
1837 mlog_errno(status);
1838 goto bail;
1839 }
1840
1841 insert_inode_hash(inode);
1842 d_instantiate(dentry, inode);
1843 bail:
1844 if (status < 0 && did_quota)
1845 dquot_free_space_nodirty(inode,
1846 ocfs2_clusters_to_bytes(osb->sb, 1));
1847 if (status < 0 && did_quota_inode)
1848 dquot_free_inode(inode);
1849 if (handle)
1850 ocfs2_commit_trans(osb, handle);
1851
1852 ocfs2_inode_unlock(dir, 1);
1853 if (did_block_signals)
1854 ocfs2_unblock_signals(&oldset);
1855
1856 brelse(new_fe_bh);
1857 brelse(parent_fe_bh);
1858 kfree(si.value);
1859 ocfs2_free_dir_lookup_result(&lookup);
1860 if (inode_ac)
1861 ocfs2_free_alloc_context(inode_ac);
1862 if (data_ac)
1863 ocfs2_free_alloc_context(data_ac);
1864 if (xattr_ac)
1865 ocfs2_free_alloc_context(xattr_ac);
1866 if ((status < 0) && inode) {
1867 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
1868 clear_nlink(inode);
1869 iput(inode);
1870 }
1871
1872 if (status)
1873 mlog_errno(status);
1874
1875 return status;
1876 }
1877
1878 static int ocfs2_blkno_stringify(u64 blkno, char *name)
1879 {
1880 int status, namelen;
1881
1882 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1883 (long long)blkno);
1884 if (namelen <= 0) {
1885 if (namelen)
1886 status = namelen;
1887 else
1888 status = -EINVAL;
1889 mlog_errno(status);
1890 goto bail;
1891 }
1892 if (namelen != OCFS2_ORPHAN_NAMELEN) {
1893 status = -EINVAL;
1894 mlog_errno(status);
1895 goto bail;
1896 }
1897
1898 trace_ocfs2_blkno_stringify(blkno, name, namelen);
1899
1900 status = 0;
1901 bail:
1902 if (status < 0)
1903 mlog_errno(status);
1904 return status;
1905 }
1906
1907 static int ocfs2_lookup_lock_orphan_dir(struct ocfs2_super *osb,
1908 struct inode **ret_orphan_dir,
1909 struct buffer_head **ret_orphan_dir_bh)
1910 {
1911 struct inode *orphan_dir_inode;
1912 struct buffer_head *orphan_dir_bh = NULL;
1913 int ret = 0;
1914
1915 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
1916 ORPHAN_DIR_SYSTEM_INODE,
1917 osb->slot_num);
1918 if (!orphan_dir_inode) {
1919 ret = -ENOENT;
1920 mlog_errno(ret);
1921 return ret;
1922 }
1923
1924 mutex_lock(&orphan_dir_inode->i_mutex);
1925
1926 ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
1927 if (ret < 0) {
1928 mutex_unlock(&orphan_dir_inode->i_mutex);
1929 iput(orphan_dir_inode);
1930
1931 mlog_errno(ret);
1932 return ret;
1933 }
1934
1935 *ret_orphan_dir = orphan_dir_inode;
1936 *ret_orphan_dir_bh = orphan_dir_bh;
1937
1938 return 0;
1939 }
1940
1941 static int __ocfs2_prepare_orphan_dir(struct inode *orphan_dir_inode,
1942 struct buffer_head *orphan_dir_bh,
1943 u64 blkno,
1944 char *name,
1945 struct ocfs2_dir_lookup_result *lookup)
1946 {
1947 int ret;
1948 struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);
1949
1950 ret = ocfs2_blkno_stringify(blkno, name);
1951 if (ret < 0) {
1952 mlog_errno(ret);
1953 return ret;
1954 }
1955
1956 ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
1957 orphan_dir_bh, name,
1958 OCFS2_ORPHAN_NAMELEN, lookup);
1959 if (ret < 0) {
1960 mlog_errno(ret);
1961 return ret;
1962 }
1963
1964 return 0;
1965 }
1966
1967 /**
1968 * ocfs2_prepare_orphan_dir() - Prepare an orphan directory for
1969 * insertion of an orphan.
1970 * @osb: ocfs2 file system
1971 * @ret_orphan_dir: Orphan dir inode - returned locked!
1972 * @blkno: Actual block number of the inode to be inserted into orphan dir.
1973 * @lookup: dir lookup result, to be passed back into functions like
1974 * ocfs2_orphan_add
1975 *
1976 * Returns zero on success and the ret_orphan_dir, name and lookup
1977 * fields will be populated.
1978 *
1979 * Returns non-zero on failure.
1980 */
1981 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
1982 struct inode **ret_orphan_dir,
1983 u64 blkno,
1984 char *name,
1985 struct ocfs2_dir_lookup_result *lookup)
1986 {
1987 struct inode *orphan_dir_inode = NULL;
1988 struct buffer_head *orphan_dir_bh = NULL;
1989 int ret = 0;
1990
1991 ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode,
1992 &orphan_dir_bh);
1993 if (ret < 0) {
1994 mlog_errno(ret);
1995 return ret;
1996 }
1997
1998 ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh,
1999 blkno, name, lookup);
2000 if (ret < 0) {
2001 mlog_errno(ret);
2002 goto out;
2003 }
2004
2005 *ret_orphan_dir = orphan_dir_inode;
2006
2007 out:
2008 brelse(orphan_dir_bh);
2009
2010 if (ret) {
2011 ocfs2_inode_unlock(orphan_dir_inode, 1);
2012 mutex_unlock(&orphan_dir_inode->i_mutex);
2013 iput(orphan_dir_inode);
2014 }
2015
2016 if (ret)
2017 mlog_errno(ret);
2018 return ret;
2019 }
2020
2021 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2022 handle_t *handle,
2023 struct inode *inode,
2024 struct buffer_head *fe_bh,
2025 char *name,
2026 struct ocfs2_dir_lookup_result *lookup,
2027 struct inode *orphan_dir_inode)
2028 {
2029 struct buffer_head *orphan_dir_bh = NULL;
2030 int status = 0;
2031 struct ocfs2_dinode *orphan_fe;
2032 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
2033
2034 trace_ocfs2_orphan_add_begin(
2035 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2036
2037 status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
2038 if (status < 0) {
2039 mlog_errno(status);
2040 goto leave;
2041 }
2042
2043 status = ocfs2_journal_access_di(handle,
2044 INODE_CACHE(orphan_dir_inode),
2045 orphan_dir_bh,
2046 OCFS2_JOURNAL_ACCESS_WRITE);
2047 if (status < 0) {
2048 mlog_errno(status);
2049 goto leave;
2050 }
2051
2052 /*
2053 * We're going to journal the change of i_flags and i_orphaned_slot.
2054 * It's safe anyway, though some callers may duplicate the journaling.
2055 * Journaling within the func just make the logic look more
2056 * straightforward.
2057 */
2058 status = ocfs2_journal_access_di(handle,
2059 INODE_CACHE(inode),
2060 fe_bh,
2061 OCFS2_JOURNAL_ACCESS_WRITE);
2062 if (status < 0) {
2063 mlog_errno(status);
2064 goto leave;
2065 }
2066
2067 /* we're a cluster, and nlink can change on disk from
2068 * underneath us... */
2069 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2070 if (S_ISDIR(inode->i_mode))
2071 ocfs2_add_links_count(orphan_fe, 1);
2072 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2073 ocfs2_journal_dirty(handle, orphan_dir_bh);
2074
2075 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2076 OCFS2_ORPHAN_NAMELEN, inode,
2077 OCFS2_I(inode)->ip_blkno,
2078 orphan_dir_bh, lookup);
2079 if (status < 0) {
2080 mlog_errno(status);
2081 goto rollback;
2082 }
2083
2084 fe->i_flags |= cpu_to_le32(OCFS2_ORPHANED_FL);
2085 OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR;
2086
2087 /* Record which orphan dir our inode now resides
2088 * in. delete_inode will use this to determine which orphan
2089 * dir to lock. */
2090 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
2091
2092 ocfs2_journal_dirty(handle, fe_bh);
2093
2094 trace_ocfs2_orphan_add_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
2095 osb->slot_num);
2096
2097 rollback:
2098 if (status < 0) {
2099 if (S_ISDIR(inode->i_mode))
2100 ocfs2_add_links_count(orphan_fe, -1);
2101 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2102 }
2103
2104 leave:
2105 brelse(orphan_dir_bh);
2106
2107 return status;
2108 }
2109
2110 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2111 int ocfs2_orphan_del(struct ocfs2_super *osb,
2112 handle_t *handle,
2113 struct inode *orphan_dir_inode,
2114 struct inode *inode,
2115 struct buffer_head *orphan_dir_bh)
2116 {
2117 char name[OCFS2_ORPHAN_NAMELEN + 1];
2118 struct ocfs2_dinode *orphan_fe;
2119 int status = 0;
2120 struct ocfs2_dir_lookup_result lookup = { NULL, };
2121
2122 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2123 if (status < 0) {
2124 mlog_errno(status);
2125 goto leave;
2126 }
2127
2128 trace_ocfs2_orphan_del(
2129 (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2130 name, OCFS2_ORPHAN_NAMELEN);
2131
2132 /* find it's spot in the orphan directory */
2133 status = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, orphan_dir_inode,
2134 &lookup);
2135 if (status) {
2136 mlog_errno(status);
2137 goto leave;
2138 }
2139
2140 /* remove it from the orphan directory */
2141 status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup);
2142 if (status < 0) {
2143 mlog_errno(status);
2144 goto leave;
2145 }
2146
2147 status = ocfs2_journal_access_di(handle,
2148 INODE_CACHE(orphan_dir_inode),
2149 orphan_dir_bh,
2150 OCFS2_JOURNAL_ACCESS_WRITE);
2151 if (status < 0) {
2152 mlog_errno(status);
2153 goto leave;
2154 }
2155
2156 /* do the i_nlink dance! :) */
2157 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2158 if (S_ISDIR(inode->i_mode))
2159 ocfs2_add_links_count(orphan_fe, -1);
2160 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2161 ocfs2_journal_dirty(handle, orphan_dir_bh);
2162
2163 leave:
2164 ocfs2_free_dir_lookup_result(&lookup);
2165
2166 if (status)
2167 mlog_errno(status);
2168 return status;
2169 }
2170
2171 /**
2172 * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to receive a newly
2173 * allocated file. This is different from the typical 'add to orphan dir'
2174 * operation in that the inode does not yet exist. This is a problem because
2175 * the orphan dir stringifies the inode block number to come up with it's
2176 * dirent. Obviously if the inode does not yet exist we have a chicken and egg
2177 * problem. This function works around it by calling deeper into the orphan
2178 * and suballoc code than other callers. Use this only by necessity.
2179 * @dir: The directory which this inode will ultimately wind up under - not the
2180 * orphan dir!
2181 * @dir_bh: buffer_head the @dir inode block
2182 * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled
2183 * with the string to be used for orphan dirent. Pass back to the orphan dir
2184 * code.
2185 * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan
2186 * dir code.
2187 * @ret_di_blkno: block number where the new inode will be allocated.
2188 * @orphan_insert: Dir insert context to be passed back into orphan dir code.
2189 * @ret_inode_ac: Inode alloc context to be passed back to the allocator.
2190 *
2191 * Returns zero on success and the ret_orphan_dir, name and lookup
2192 * fields will be populated.
2193 *
2194 * Returns non-zero on failure.
2195 */
2196 static int ocfs2_prep_new_orphaned_file(struct inode *dir,
2197 struct buffer_head *dir_bh,
2198 char *orphan_name,
2199 struct inode **ret_orphan_dir,
2200 u64 *ret_di_blkno,
2201 struct ocfs2_dir_lookup_result *orphan_insert,
2202 struct ocfs2_alloc_context **ret_inode_ac)
2203 {
2204 int ret;
2205 u64 di_blkno;
2206 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2207 struct inode *orphan_dir = NULL;
2208 struct buffer_head *orphan_dir_bh = NULL;
2209 struct ocfs2_alloc_context *inode_ac = NULL;
2210
2211 ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh);
2212 if (ret < 0) {
2213 mlog_errno(ret);
2214 return ret;
2215 }
2216
2217 /* reserve an inode spot */
2218 ret = ocfs2_reserve_new_inode(osb, &inode_ac);
2219 if (ret < 0) {
2220 if (ret != -ENOSPC)
2221 mlog_errno(ret);
2222 goto out;
2223 }
2224
2225 ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
2226 &di_blkno);
2227 if (ret) {
2228 mlog_errno(ret);
2229 goto out;
2230 }
2231
2232 ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
2233 di_blkno, orphan_name, orphan_insert);
2234 if (ret < 0) {
2235 mlog_errno(ret);
2236 goto out;
2237 }
2238
2239 out:
2240 if (ret == 0) {
2241 *ret_orphan_dir = orphan_dir;
2242 *ret_di_blkno = di_blkno;
2243 *ret_inode_ac = inode_ac;
2244 /*
2245 * orphan_name and orphan_insert are already up to
2246 * date via prepare_orphan_dir
2247 */
2248 } else {
2249 /* Unroll reserve_new_inode* */
2250 if (inode_ac)
2251 ocfs2_free_alloc_context(inode_ac);
2252
2253 /* Unroll orphan dir locking */
2254 mutex_unlock(&orphan_dir->i_mutex);
2255 ocfs2_inode_unlock(orphan_dir, 1);
2256 iput(orphan_dir);
2257 }
2258
2259 brelse(orphan_dir_bh);
2260
2261 return ret;
2262 }
2263
2264 int ocfs2_create_inode_in_orphan(struct inode *dir,
2265 int mode,
2266 struct inode **new_inode)
2267 {
2268 int status, did_quota_inode = 0;
2269 struct inode *inode = NULL;
2270 struct inode *orphan_dir = NULL;
2271 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2272 struct ocfs2_dinode *di = NULL;
2273 handle_t *handle = NULL;
2274 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
2275 struct buffer_head *parent_di_bh = NULL;
2276 struct buffer_head *new_di_bh = NULL;
2277 struct ocfs2_alloc_context *inode_ac = NULL;
2278 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2279 u64 uninitialized_var(di_blkno), suballoc_loc;
2280 u16 suballoc_bit;
2281
2282 status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2283 if (status < 0) {
2284 if (status != -ENOENT)
2285 mlog_errno(status);
2286 return status;
2287 }
2288
2289 status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
2290 orphan_name, &orphan_dir,
2291 &di_blkno, &orphan_insert, &inode_ac);
2292 if (status < 0) {
2293 if (status != -ENOSPC)
2294 mlog_errno(status);
2295 goto leave;
2296 }
2297
2298 inode = ocfs2_get_init_inode(dir, mode);
2299 if (!inode) {
2300 status = -ENOMEM;
2301 mlog_errno(status);
2302 goto leave;
2303 }
2304
2305 handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
2306 if (IS_ERR(handle)) {
2307 status = PTR_ERR(handle);
2308 handle = NULL;
2309 mlog_errno(status);
2310 goto leave;
2311 }
2312
2313 status = dquot_alloc_inode(inode);
2314 if (status)
2315 goto leave;
2316 did_quota_inode = 1;
2317
2318 status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
2319 &suballoc_loc,
2320 &suballoc_bit, di_blkno);
2321 if (status < 0) {
2322 mlog_errno(status);
2323 goto leave;
2324 }
2325
2326 clear_nlink(inode);
2327 /* do the real work now. */
2328 status = __ocfs2_mknod_locked(dir, inode,
2329 0, &new_di_bh, parent_di_bh, handle,
2330 inode_ac, di_blkno, suballoc_loc,
2331 suballoc_bit);
2332 if (status < 0) {
2333 mlog_errno(status);
2334 goto leave;
2335 }
2336
2337 di = (struct ocfs2_dinode *)new_di_bh->b_data;
2338 status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
2339 &orphan_insert, orphan_dir);
2340 if (status < 0) {
2341 mlog_errno(status);
2342 goto leave;
2343 }
2344
2345 /* get open lock so that only nodes can't remove it from orphan dir. */
2346 status = ocfs2_open_lock(inode);
2347 if (status < 0)
2348 mlog_errno(status);
2349
2350 insert_inode_hash(inode);
2351 leave:
2352 if (status < 0 && did_quota_inode)
2353 dquot_free_inode(inode);
2354 if (handle)
2355 ocfs2_commit_trans(osb, handle);
2356
2357 if (orphan_dir) {
2358 /* This was locked for us in ocfs2_prepare_orphan_dir() */
2359 ocfs2_inode_unlock(orphan_dir, 1);
2360 mutex_unlock(&orphan_dir->i_mutex);
2361 iput(orphan_dir);
2362 }
2363
2364 if ((status < 0) && inode) {
2365 clear_nlink(inode);
2366 iput(inode);
2367 }
2368
2369 if (inode_ac)
2370 ocfs2_free_alloc_context(inode_ac);
2371
2372 brelse(new_di_bh);
2373
2374 if (!status)
2375 *new_inode = inode;
2376
2377 ocfs2_free_dir_lookup_result(&orphan_insert);
2378
2379 ocfs2_inode_unlock(dir, 1);
2380 brelse(parent_di_bh);
2381 return status;
2382 }
2383
2384 int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
2385 struct inode *inode,
2386 struct dentry *dentry)
2387 {
2388 int status = 0;
2389 struct buffer_head *parent_di_bh = NULL;
2390 handle_t *handle = NULL;
2391 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2392 struct ocfs2_dinode *dir_di, *di;
2393 struct inode *orphan_dir_inode = NULL;
2394 struct buffer_head *orphan_dir_bh = NULL;
2395 struct buffer_head *di_bh = NULL;
2396 struct ocfs2_dir_lookup_result lookup = { NULL, };
2397
2398 trace_ocfs2_mv_orphaned_inode_to_new(dir, dentry,
2399 dentry->d_name.len, dentry->d_name.name,
2400 (unsigned long long)OCFS2_I(dir)->ip_blkno,
2401 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2402
2403 status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2404 if (status < 0) {
2405 if (status != -ENOENT)
2406 mlog_errno(status);
2407 return status;
2408 }
2409
2410 dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
2411 if (!dir_di->i_links_count) {
2412 /* can't make a file in a deleted directory. */
2413 status = -ENOENT;
2414 goto leave;
2415 }
2416
2417 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
2418 dentry->d_name.len);
2419 if (status)
2420 goto leave;
2421
2422 /* get a spot inside the dir. */
2423 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_di_bh,
2424 dentry->d_name.name,
2425 dentry->d_name.len, &lookup);
2426 if (status < 0) {
2427 mlog_errno(status);
2428 goto leave;
2429 }
2430
2431 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2432 ORPHAN_DIR_SYSTEM_INODE,
2433 osb->slot_num);
2434 if (!orphan_dir_inode) {
2435 status = -EEXIST;
2436 mlog_errno(status);
2437 goto leave;
2438 }
2439
2440 mutex_lock(&orphan_dir_inode->i_mutex);
2441
2442 status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2443 if (status < 0) {
2444 mlog_errno(status);
2445 mutex_unlock(&orphan_dir_inode->i_mutex);
2446 iput(orphan_dir_inode);
2447 goto leave;
2448 }
2449
2450 status = ocfs2_read_inode_block(inode, &di_bh);
2451 if (status < 0) {
2452 mlog_errno(status);
2453 goto orphan_unlock;
2454 }
2455
2456 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
2457 if (IS_ERR(handle)) {
2458 status = PTR_ERR(handle);
2459 handle = NULL;
2460 mlog_errno(status);
2461 goto orphan_unlock;
2462 }
2463
2464 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
2465 di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2466 if (status < 0) {
2467 mlog_errno(status);
2468 goto out_commit;
2469 }
2470
2471 status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
2472 orphan_dir_bh);
2473 if (status < 0) {
2474 mlog_errno(status);
2475 goto out_commit;
2476 }
2477
2478 di = (struct ocfs2_dinode *)di_bh->b_data;
2479 di->i_flags &= ~cpu_to_le32(OCFS2_ORPHANED_FL);
2480 di->i_orphaned_slot = 0;
2481 set_nlink(inode, 1);
2482 ocfs2_set_links_count(di, inode->i_nlink);
2483 ocfs2_update_inode_fsync_trans(handle, inode, 1);
2484 ocfs2_journal_dirty(handle, di_bh);
2485
2486 status = ocfs2_add_entry(handle, dentry, inode,
2487 OCFS2_I(inode)->ip_blkno, parent_di_bh,
2488 &lookup);
2489 if (status < 0) {
2490 mlog_errno(status);
2491 goto out_commit;
2492 }
2493
2494 status = ocfs2_dentry_attach_lock(dentry, inode,
2495 OCFS2_I(dir)->ip_blkno);
2496 if (status) {
2497 mlog_errno(status);
2498 goto out_commit;
2499 }
2500
2501 d_instantiate(dentry, inode);
2502 status = 0;
2503 out_commit:
2504 ocfs2_commit_trans(osb, handle);
2505 orphan_unlock:
2506 ocfs2_inode_unlock(orphan_dir_inode, 1);
2507 mutex_unlock(&orphan_dir_inode->i_mutex);
2508 iput(orphan_dir_inode);
2509 leave:
2510
2511 ocfs2_inode_unlock(dir, 1);
2512
2513 brelse(di_bh);
2514 brelse(parent_di_bh);
2515 brelse(orphan_dir_bh);
2516
2517 ocfs2_free_dir_lookup_result(&lookup);
2518
2519 if (status)
2520 mlog_errno(status);
2521
2522 return status;
2523 }
2524
2525 const struct inode_operations ocfs2_dir_iops = {
2526 .create = ocfs2_create,
2527 .lookup = ocfs2_lookup,
2528 .link = ocfs2_link,
2529 .unlink = ocfs2_unlink,
2530 .rmdir = ocfs2_unlink,
2531 .symlink = ocfs2_symlink,
2532 .mkdir = ocfs2_mkdir,
2533 .mknod = ocfs2_mknod,
2534 .rename = ocfs2_rename,
2535 .setattr = ocfs2_setattr,
2536 .getattr = ocfs2_getattr,
2537 .permission = ocfs2_permission,
2538 .setxattr = generic_setxattr,
2539 .getxattr = generic_getxattr,
2540 .listxattr = ocfs2_listxattr,
2541 .removexattr = generic_removexattr,
2542 .fiemap = ocfs2_fiemap,
2543 .get_acl = ocfs2_iop_get_acl,
2544 .set_acl = ocfs2_iop_set_acl,
2545 };
Linux with added FPC-III support