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[S390] s390dbf: Remove redundant initilizations.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ocfs2 / namei.c
blob4b11762f249e91aba2d4ece846bbc86ac8058005
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 #define MLOG_MASK_PREFIX ML_NAMEI
46 #include <cluster/masklog.h>
47
48 #include "ocfs2.h"
49
50 #include "alloc.h"
51 #include "dcache.h"
52 #include "dir.h"
53 #include "dlmglue.h"
54 #include "extent_map.h"
55 #include "file.h"
56 #include "inode.h"
57 #include "journal.h"
58 #include "namei.h"
59 #include "suballoc.h"
60 #include "super.h"
61 #include "symlink.h"
62 #include "sysfile.h"
63 #include "uptodate.h"
64 #include "xattr.h"
65 #include "acl.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 struct dentry *dentry,
73 dev_t dev,
74 struct buffer_head **new_fe_bh,
75 struct buffer_head *parent_fe_bh,
76 handle_t *handle,
77 struct ocfs2_alloc_context *inode_ac);
78
79 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
80 struct inode **ret_orphan_dir,
81 struct inode *inode,
82 char *name,
83 struct buffer_head **de_bh);
84
85 static int ocfs2_orphan_add(struct ocfs2_super *osb,
86 handle_t *handle,
87 struct inode *inode,
88 struct ocfs2_dinode *fe,
89 char *name,
90 struct buffer_head *de_bh,
91 struct inode *orphan_dir_inode);
92
93 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
94 handle_t *handle,
95 struct inode *inode,
96 const char *symname);
97
98 /* An orphan dir name is an 8 byte value, printed as a hex string */
99 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
100
101 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
102 struct nameidata *nd)
103 {
104 int status;
105 u64 blkno;
106 struct inode *inode = NULL;
107 struct dentry *ret;
108 struct ocfs2_inode_info *oi;
109
110 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
111 dentry->d_name.len, dentry->d_name.name);
112
113 if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
114 ret = ERR_PTR(-ENAMETOOLONG);
115 goto bail;
116 }
117
118 mlog(0, "find name %.*s in directory %llu\n", dentry->d_name.len,
119 dentry->d_name.name, (unsigned long long)OCFS2_I(dir)->ip_blkno);
120
121 status = ocfs2_inode_lock(dir, NULL, 0);
122 if (status < 0) {
123 if (status != -ENOENT)
124 mlog_errno(status);
125 ret = ERR_PTR(status);
126 goto bail;
127 }
128
129 status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
130 dentry->d_name.len, &blkno);
131 if (status < 0)
132 goto bail_add;
133
134 inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
135 if (IS_ERR(inode)) {
136 ret = ERR_PTR(-EACCES);
137 goto bail_unlock;
138 }
139
140 oi = OCFS2_I(inode);
141 /* Clear any orphaned state... If we were able to look up the
142 * inode from a directory, it certainly can't be orphaned. We
143 * might have the bad state from a node which intended to
144 * orphan this inode but crashed before it could commit the
145 * unlink. */
146 spin_lock(&oi->ip_lock);
147 oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
148 spin_unlock(&oi->ip_lock);
149
150 bail_add:
151 dentry->d_op = &ocfs2_dentry_ops;
152 ret = d_splice_alias(inode, dentry);
153
154 if (inode) {
155 /*
156 * If d_splice_alias() finds a DCACHE_DISCONNECTED
157 * dentry, it will d_move() it on top of ourse. The
158 * return value will indicate this however, so in
159 * those cases, we switch them around for the locking
160 * code.
161 *
162 * NOTE: This dentry already has ->d_op set from
163 * ocfs2_get_parent() and ocfs2_get_dentry()
164 */
165 if (ret)
166 dentry = ret;
167
168 status = ocfs2_dentry_attach_lock(dentry, inode,
169 OCFS2_I(dir)->ip_blkno);
170 if (status) {
171 mlog_errno(status);
172 ret = ERR_PTR(status);
173 goto bail_unlock;
174 }
175 }
176
177 bail_unlock:
178 /* Don't drop the cluster lock until *after* the d_add --
179 * unlink on another node will message us to remove that
180 * dentry under this lock so otherwise we can race this with
181 * the downconvert thread and have a stale dentry. */
182 ocfs2_inode_unlock(dir, 0);
183
184 bail:
185
186 mlog_exit_ptr(ret);
187
188 return ret;
189 }
190
191 static struct inode *ocfs2_get_init_inode(struct inode *dir, int mode)
192 {
193 struct inode *inode;
194
195 inode = new_inode(dir->i_sb);
196 if (!inode) {
197 mlog(ML_ERROR, "new_inode failed!\n");
198 return NULL;
199 }
200
201 /* populate as many fields early on as possible - many of
202 * these are used by the support functions here and in
203 * callers. */
204 if (S_ISDIR(mode))
205 inode->i_nlink = 2;
206 else
207 inode->i_nlink = 1;
208 inode->i_uid = current_fsuid();
209 if (dir->i_mode & S_ISGID) {
210 inode->i_gid = dir->i_gid;
211 if (S_ISDIR(mode))
212 mode |= S_ISGID;
213 } else
214 inode->i_gid = current_fsgid();
215 inode->i_mode = mode;
216 vfs_dq_init(inode);
217 return inode;
218 }
219
220 static int ocfs2_mknod(struct inode *dir,
221 struct dentry *dentry,
222 int mode,
223 dev_t dev)
224 {
225 int status = 0;
226 struct buffer_head *parent_fe_bh = NULL;
227 handle_t *handle = NULL;
228 struct ocfs2_super *osb;
229 struct ocfs2_dinode *dirfe;
230 struct buffer_head *new_fe_bh = NULL;
231 struct buffer_head *de_bh = NULL;
232 struct inode *inode = NULL;
233 struct ocfs2_alloc_context *inode_ac = NULL;
234 struct ocfs2_alloc_context *data_ac = NULL;
235 struct ocfs2_alloc_context *xattr_ac = NULL;
236 int want_clusters = 0;
237 int xattr_credits = 0;
238 struct ocfs2_security_xattr_info si = {
239 .enable = 1,
240 };
241 int did_quota_inode = 0;
242
243 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
244 (unsigned long)dev, dentry->d_name.len,
245 dentry->d_name.name);
246
247 /* get our super block */
248 osb = OCFS2_SB(dir->i_sb);
249
250 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
251 if (status < 0) {
252 if (status != -ENOENT)
253 mlog_errno(status);
254 return status;
255 }
256
257 if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
258 status = -EMLINK;
259 goto leave;
260 }
261
262 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
263 if (!dirfe->i_links_count) {
264 /* can't make a file in a deleted directory. */
265 status = -ENOENT;
266 goto leave;
267 }
268
269 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
270 dentry->d_name.len);
271 if (status)
272 goto leave;
273
274 /* get a spot inside the dir. */
275 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
276 dentry->d_name.name,
277 dentry->d_name.len, &de_bh);
278 if (status < 0) {
279 mlog_errno(status);
280 goto leave;
281 }
282
283 /* reserve an inode spot */
284 status = ocfs2_reserve_new_inode(osb, &inode_ac);
285 if (status < 0) {
286 if (status != -ENOSPC)
287 mlog_errno(status);
288 goto leave;
289 }
290
291 inode = ocfs2_get_init_inode(dir, mode);
292 if (!inode) {
293 status = -ENOMEM;
294 mlog_errno(status);
295 goto leave;
296 }
297
298 /* get security xattr */
299 status = ocfs2_init_security_get(inode, dir, &si);
300 if (status) {
301 if (status == -EOPNOTSUPP)
302 si.enable = 0;
303 else {
304 mlog_errno(status);
305 goto leave;
306 }
307 }
308
309 /* calculate meta data/clusters for setting security and acl xattr */
310 status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
311 &si, &want_clusters,
312 &xattr_credits, &xattr_ac);
313 if (status < 0) {
314 mlog_errno(status);
315 goto leave;
316 }
317
318 /* Reserve a cluster if creating an extent based directory. */
319 if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb))
320 want_clusters += 1;
321
322 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
323 if (status < 0) {
324 if (status != -ENOSPC)
325 mlog_errno(status);
326 goto leave;
327 }
328
329 handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb) +
330 xattr_credits);
331 if (IS_ERR(handle)) {
332 status = PTR_ERR(handle);
333 handle = NULL;
334 mlog_errno(status);
335 goto leave;
336 }
337
338 /* We don't use standard VFS wrapper because we don't want vfs_dq_init
339 * to be called. */
340 if (sb_any_quota_active(osb->sb) &&
341 osb->sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA) {
342 status = -EDQUOT;
343 goto leave;
344 }
345 did_quota_inode = 1;
346
347 /* do the real work now. */
348 status = ocfs2_mknod_locked(osb, dir, inode, dentry, dev,
349 &new_fe_bh, parent_fe_bh, handle,
350 inode_ac);
351 if (status < 0) {
352 mlog_errno(status);
353 goto leave;
354 }
355
356 if (S_ISDIR(mode)) {
357 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
358 new_fe_bh, data_ac);
359 if (status < 0) {
360 mlog_errno(status);
361 goto leave;
362 }
363
364 status = ocfs2_journal_access_di(handle, dir, parent_fe_bh,
365 OCFS2_JOURNAL_ACCESS_WRITE);
366 if (status < 0) {
367 mlog_errno(status);
368 goto leave;
369 }
370 le16_add_cpu(&dirfe->i_links_count, 1);
371 status = ocfs2_journal_dirty(handle, parent_fe_bh);
372 if (status < 0) {
373 mlog_errno(status);
374 goto leave;
375 }
376 inc_nlink(dir);
377 }
378
379 status = ocfs2_init_acl(handle, inode, dir, new_fe_bh, parent_fe_bh,
380 xattr_ac, data_ac);
381 if (status < 0) {
382 mlog_errno(status);
383 goto leave;
384 }
385
386 if (si.enable) {
387 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
388 xattr_ac, data_ac);
389 if (status < 0) {
390 mlog_errno(status);
391 goto leave;
392 }
393 }
394
395 status = ocfs2_add_entry(handle, dentry, inode,
396 OCFS2_I(inode)->ip_blkno, parent_fe_bh,
397 de_bh);
398 if (status < 0) {
399 mlog_errno(status);
400 goto leave;
401 }
402
403 status = ocfs2_dentry_attach_lock(dentry, inode,
404 OCFS2_I(dir)->ip_blkno);
405 if (status) {
406 mlog_errno(status);
407 goto leave;
408 }
409
410 insert_inode_hash(inode);
411 dentry->d_op = &ocfs2_dentry_ops;
412 d_instantiate(dentry, inode);
413 status = 0;
414 leave:
415 if (status < 0 && did_quota_inode)
416 vfs_dq_free_inode(inode);
417 if (handle)
418 ocfs2_commit_trans(osb, handle);
419
420 ocfs2_inode_unlock(dir, 1);
421
422 if (status == -ENOSPC)
423 mlog(0, "Disk is full\n");
424
425 brelse(new_fe_bh);
426 brelse(de_bh);
427 brelse(parent_fe_bh);
428 kfree(si.name);
429 kfree(si.value);
430
431 if ((status < 0) && inode) {
432 clear_nlink(inode);
433 iput(inode);
434 }
435
436 if (inode_ac)
437 ocfs2_free_alloc_context(inode_ac);
438
439 if (data_ac)
440 ocfs2_free_alloc_context(data_ac);
441
442 if (xattr_ac)
443 ocfs2_free_alloc_context(xattr_ac);
444
445 mlog_exit(status);
446
447 return status;
448 }
449
450 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
451 struct inode *dir,
452 struct inode *inode,
453 struct dentry *dentry,
454 dev_t dev,
455 struct buffer_head **new_fe_bh,
456 struct buffer_head *parent_fe_bh,
457 handle_t *handle,
458 struct ocfs2_alloc_context *inode_ac)
459 {
460 int status = 0;
461 struct ocfs2_dinode *fe = NULL;
462 struct ocfs2_extent_list *fel;
463 u64 fe_blkno = 0;
464 u16 suballoc_bit;
465
466 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry,
467 inode->i_mode, (unsigned long)dev, dentry->d_name.len,
468 dentry->d_name.name);
469
470 *new_fe_bh = NULL;
471
472 status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
473 &fe_blkno);
474 if (status < 0) {
475 mlog_errno(status);
476 goto leave;
477 }
478
479 /* populate as many fields early on as possible - many of
480 * these are used by the support functions here and in
481 * callers. */
482 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
483 OCFS2_I(inode)->ip_blkno = fe_blkno;
484 spin_lock(&osb->osb_lock);
485 inode->i_generation = osb->s_next_generation++;
486 spin_unlock(&osb->osb_lock);
487
488 *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
489 if (!*new_fe_bh) {
490 status = -EIO;
491 mlog_errno(status);
492 goto leave;
493 }
494 ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
495
496 status = ocfs2_journal_access_di(handle, inode, *new_fe_bh,
497 OCFS2_JOURNAL_ACCESS_CREATE);
498 if (status < 0) {
499 mlog_errno(status);
500 goto leave;
501 }
502
503 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
504 memset(fe, 0, osb->sb->s_blocksize);
505
506 fe->i_generation = cpu_to_le32(inode->i_generation);
507 fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
508 fe->i_blkno = cpu_to_le64(fe_blkno);
509 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
510 fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot);
511 fe->i_uid = cpu_to_le32(inode->i_uid);
512 fe->i_gid = cpu_to_le32(inode->i_gid);
513 fe->i_mode = cpu_to_le16(inode->i_mode);
514 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
515 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
516 fe->i_links_count = cpu_to_le16(inode->i_nlink);
517
518 fe->i_last_eb_blk = 0;
519 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
520 le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
521 fe->i_atime = fe->i_ctime = fe->i_mtime =
522 cpu_to_le64(CURRENT_TIME.tv_sec);
523 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
524 cpu_to_le32(CURRENT_TIME.tv_nsec);
525 fe->i_dtime = 0;
526
527 /*
528 * If supported, directories start with inline data.
529 */
530 if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
531 u16 feat = le16_to_cpu(fe->i_dyn_features);
532
533 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
534
535 fe->id2.i_data.id_count = cpu_to_le16(
536 ocfs2_max_inline_data_with_xattr(osb->sb, fe));
537 } else {
538 fel = &fe->id2.i_list;
539 fel->l_tree_depth = 0;
540 fel->l_next_free_rec = 0;
541 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
542 }
543
544 status = ocfs2_journal_dirty(handle, *new_fe_bh);
545 if (status < 0) {
546 mlog_errno(status);
547 goto leave;
548 }
549
550 ocfs2_populate_inode(inode, fe, 1);
551 ocfs2_inode_set_new(osb, inode);
552 if (!ocfs2_mount_local(osb)) {
553 status = ocfs2_create_new_inode_locks(inode);
554 if (status < 0)
555 mlog_errno(status);
556 }
557
558 status = 0; /* error in ocfs2_create_new_inode_locks is not
559 * critical */
560
561 leave:
562 if (status < 0) {
563 if (*new_fe_bh) {
564 brelse(*new_fe_bh);
565 *new_fe_bh = NULL;
566 }
567 }
568
569 mlog_exit(status);
570 return status;
571 }
572
573 static int ocfs2_mkdir(struct inode *dir,
574 struct dentry *dentry,
575 int mode)
576 {
577 int ret;
578
579 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
580 dentry->d_name.len, dentry->d_name.name);
581 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
582 mlog_exit(ret);
583
584 return ret;
585 }
586
587 static int ocfs2_create(struct inode *dir,
588 struct dentry *dentry,
589 int mode,
590 struct nameidata *nd)
591 {
592 int ret;
593
594 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
595 dentry->d_name.len, dentry->d_name.name);
596 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
597 mlog_exit(ret);
598
599 return ret;
600 }
601
602 static int ocfs2_link(struct dentry *old_dentry,
603 struct inode *dir,
604 struct dentry *dentry)
605 {
606 handle_t *handle;
607 struct inode *inode = old_dentry->d_inode;
608 int err;
609 struct buffer_head *fe_bh = NULL;
610 struct buffer_head *parent_fe_bh = NULL;
611 struct buffer_head *de_bh = NULL;
612 struct ocfs2_dinode *fe = NULL;
613 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
614
615 mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
616 old_dentry->d_name.len, old_dentry->d_name.name,
617 dentry->d_name.len, dentry->d_name.name);
618
619 if (S_ISDIR(inode->i_mode))
620 return -EPERM;
621
622 err = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
623 if (err < 0) {
624 if (err != -ENOENT)
625 mlog_errno(err);
626 return err;
627 }
628
629 if (!dir->i_nlink) {
630 err = -ENOENT;
631 goto out;
632 }
633
634 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
635 dentry->d_name.len);
636 if (err)
637 goto out;
638
639 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
640 dentry->d_name.name,
641 dentry->d_name.len, &de_bh);
642 if (err < 0) {
643 mlog_errno(err);
644 goto out;
645 }
646
647 err = ocfs2_inode_lock(inode, &fe_bh, 1);
648 if (err < 0) {
649 if (err != -ENOENT)
650 mlog_errno(err);
651 goto out;
652 }
653
654 fe = (struct ocfs2_dinode *) fe_bh->b_data;
655 if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
656 err = -EMLINK;
657 goto out_unlock_inode;
658 }
659
660 handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb));
661 if (IS_ERR(handle)) {
662 err = PTR_ERR(handle);
663 handle = NULL;
664 mlog_errno(err);
665 goto out_unlock_inode;
666 }
667
668 err = ocfs2_journal_access_di(handle, inode, fe_bh,
669 OCFS2_JOURNAL_ACCESS_WRITE);
670 if (err < 0) {
671 mlog_errno(err);
672 goto out_commit;
673 }
674
675 inc_nlink(inode);
676 inode->i_ctime = CURRENT_TIME;
677 fe->i_links_count = cpu_to_le16(inode->i_nlink);
678 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
679 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
680
681 err = ocfs2_journal_dirty(handle, fe_bh);
682 if (err < 0) {
683 le16_add_cpu(&fe->i_links_count, -1);
684 drop_nlink(inode);
685 mlog_errno(err);
686 goto out_commit;
687 }
688
689 err = ocfs2_add_entry(handle, dentry, inode,
690 OCFS2_I(inode)->ip_blkno,
691 parent_fe_bh, de_bh);
692 if (err) {
693 le16_add_cpu(&fe->i_links_count, -1);
694 drop_nlink(inode);
695 mlog_errno(err);
696 goto out_commit;
697 }
698
699 err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
700 if (err) {
701 mlog_errno(err);
702 goto out_commit;
703 }
704
705 atomic_inc(&inode->i_count);
706 dentry->d_op = &ocfs2_dentry_ops;
707 d_instantiate(dentry, inode);
708
709 out_commit:
710 ocfs2_commit_trans(osb, handle);
711 out_unlock_inode:
712 ocfs2_inode_unlock(inode, 1);
713
714 out:
715 ocfs2_inode_unlock(dir, 1);
716
717 brelse(de_bh);
718 brelse(fe_bh);
719 brelse(parent_fe_bh);
720
721 mlog_exit(err);
722
723 return err;
724 }
725
726 /*
727 * Takes and drops an exclusive lock on the given dentry. This will
728 * force other nodes to drop it.
729 */
730 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
731 {
732 int ret;
733
734 ret = ocfs2_dentry_lock(dentry, 1);
735 if (ret)
736 mlog_errno(ret);
737 else
738 ocfs2_dentry_unlock(dentry, 1);
739
740 return ret;
741 }
742
743 static inline int inode_is_unlinkable(struct inode *inode)
744 {
745 if (S_ISDIR(inode->i_mode)) {
746 if (inode->i_nlink == 2)
747 return 1;
748 return 0;
749 }
750
751 if (inode->i_nlink == 1)
752 return 1;
753 return 0;
754 }
755
756 static int ocfs2_unlink(struct inode *dir,
757 struct dentry *dentry)
758 {
759 int status;
760 int child_locked = 0;
761 struct inode *inode = dentry->d_inode;
762 struct inode *orphan_dir = NULL;
763 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
764 u64 blkno;
765 struct ocfs2_dinode *fe = NULL;
766 struct buffer_head *fe_bh = NULL;
767 struct buffer_head *parent_node_bh = NULL;
768 handle_t *handle = NULL;
769 struct ocfs2_dir_entry *dirent = NULL;
770 struct buffer_head *dirent_bh = NULL;
771 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
772 struct buffer_head *orphan_entry_bh = NULL;
773
774 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
775 dentry->d_name.len, dentry->d_name.name);
776
777 BUG_ON(dentry->d_parent->d_inode != dir);
778
779 mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
780
781 if (inode == osb->root_inode) {
782 mlog(0, "Cannot delete the root directory\n");
783 return -EPERM;
784 }
785
786 status = ocfs2_inode_lock(dir, &parent_node_bh, 1);
787 if (status < 0) {
788 if (status != -ENOENT)
789 mlog_errno(status);
790 return status;
791 }
792
793 status = ocfs2_find_files_on_disk(dentry->d_name.name,
794 dentry->d_name.len, &blkno,
795 dir, &dirent_bh, &dirent);
796 if (status < 0) {
797 if (status != -ENOENT)
798 mlog_errno(status);
799 goto leave;
800 }
801
802 if (OCFS2_I(inode)->ip_blkno != blkno) {
803 status = -ENOENT;
804
805 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
806 (unsigned long long)OCFS2_I(inode)->ip_blkno,
807 (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
808 goto leave;
809 }
810
811 status = ocfs2_inode_lock(inode, &fe_bh, 1);
812 if (status < 0) {
813 if (status != -ENOENT)
814 mlog_errno(status);
815 goto leave;
816 }
817 child_locked = 1;
818
819 if (S_ISDIR(inode->i_mode)) {
820 if (!ocfs2_empty_dir(inode)) {
821 status = -ENOTEMPTY;
822 goto leave;
823 } else if (inode->i_nlink != 2) {
824 status = -ENOTEMPTY;
825 goto leave;
826 }
827 }
828
829 status = ocfs2_remote_dentry_delete(dentry);
830 if (status < 0) {
831 /* This remote delete should succeed under all normal
832 * circumstances. */
833 mlog_errno(status);
834 goto leave;
835 }
836
837 if (inode_is_unlinkable(inode)) {
838 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
839 orphan_name,
840 &orphan_entry_bh);
841 if (status < 0) {
842 mlog_errno(status);
843 goto leave;
844 }
845 }
846
847 handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb));
848 if (IS_ERR(handle)) {
849 status = PTR_ERR(handle);
850 handle = NULL;
851 mlog_errno(status);
852 goto leave;
853 }
854
855 status = ocfs2_journal_access_di(handle, inode, fe_bh,
856 OCFS2_JOURNAL_ACCESS_WRITE);
857 if (status < 0) {
858 mlog_errno(status);
859 goto leave;
860 }
861
862 fe = (struct ocfs2_dinode *) fe_bh->b_data;
863
864 if (inode_is_unlinkable(inode)) {
865 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
866 orphan_entry_bh, orphan_dir);
867 if (status < 0) {
868 mlog_errno(status);
869 goto leave;
870 }
871 }
872
873 /* delete the name from the parent dir */
874 status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
875 if (status < 0) {
876 mlog_errno(status);
877 goto leave;
878 }
879
880 if (S_ISDIR(inode->i_mode))
881 drop_nlink(inode);
882 drop_nlink(inode);
883 fe->i_links_count = cpu_to_le16(inode->i_nlink);
884
885 status = ocfs2_journal_dirty(handle, fe_bh);
886 if (status < 0) {
887 mlog_errno(status);
888 goto leave;
889 }
890
891 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
892 if (S_ISDIR(inode->i_mode))
893 drop_nlink(dir);
894
895 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
896 if (status < 0) {
897 mlog_errno(status);
898 if (S_ISDIR(inode->i_mode))
899 inc_nlink(dir);
900 }
901
902 leave:
903 if (handle)
904 ocfs2_commit_trans(osb, handle);
905
906 if (child_locked)
907 ocfs2_inode_unlock(inode, 1);
908
909 ocfs2_inode_unlock(dir, 1);
910
911 if (orphan_dir) {
912 /* This was locked for us in ocfs2_prepare_orphan_dir() */
913 ocfs2_inode_unlock(orphan_dir, 1);
914 mutex_unlock(&orphan_dir->i_mutex);
915 iput(orphan_dir);
916 }
917
918 brelse(fe_bh);
919 brelse(dirent_bh);
920 brelse(parent_node_bh);
921 brelse(orphan_entry_bh);
922
923 mlog_exit(status);
924
925 return status;
926 }
927
928 /*
929 * The only place this should be used is rename!
930 * if they have the same id, then the 1st one is the only one locked.
931 */
932 static int ocfs2_double_lock(struct ocfs2_super *osb,
933 struct buffer_head **bh1,
934 struct inode *inode1,
935 struct buffer_head **bh2,
936 struct inode *inode2)
937 {
938 int status;
939 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
940 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
941 struct buffer_head **tmpbh;
942 struct inode *tmpinode;
943
944 mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
945 (unsigned long long)oi1->ip_blkno,
946 (unsigned long long)oi2->ip_blkno);
947
948 if (*bh1)
949 *bh1 = NULL;
950 if (*bh2)
951 *bh2 = NULL;
952
953 /* we always want to lock the one with the lower lockid first. */
954 if (oi1->ip_blkno != oi2->ip_blkno) {
955 if (oi1->ip_blkno < oi2->ip_blkno) {
956 /* switch id1 and id2 around */
957 mlog(0, "switching them around...\n");
958 tmpbh = bh2;
959 bh2 = bh1;
960 bh1 = tmpbh;
961
962 tmpinode = inode2;
963 inode2 = inode1;
964 inode1 = tmpinode;
965 }
966 /* lock id2 */
967 status = ocfs2_inode_lock(inode2, bh2, 1);
968 if (status < 0) {
969 if (status != -ENOENT)
970 mlog_errno(status);
971 goto bail;
972 }
973 }
974
975 /* lock id1 */
976 status = ocfs2_inode_lock(inode1, bh1, 1);
977 if (status < 0) {
978 /*
979 * An error return must mean that no cluster locks
980 * were held on function exit.
981 */
982 if (oi1->ip_blkno != oi2->ip_blkno)
983 ocfs2_inode_unlock(inode2, 1);
984
985 if (status != -ENOENT)
986 mlog_errno(status);
987 }
988
989 bail:
990 mlog_exit(status);
991 return status;
992 }
993
994 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
995 {
996 ocfs2_inode_unlock(inode1, 1);
997
998 if (inode1 != inode2)
999 ocfs2_inode_unlock(inode2, 1);
1000 }
1001
1002 static int ocfs2_rename(struct inode *old_dir,
1003 struct dentry *old_dentry,
1004 struct inode *new_dir,
1005 struct dentry *new_dentry)
1006 {
1007 int status = 0, rename_lock = 0, parents_locked = 0;
1008 int old_child_locked = 0, new_child_locked = 0;
1009 struct inode *old_inode = old_dentry->d_inode;
1010 struct inode *new_inode = new_dentry->d_inode;
1011 struct inode *orphan_dir = NULL;
1012 struct ocfs2_dinode *newfe = NULL;
1013 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1014 struct buffer_head *orphan_entry_bh = NULL;
1015 struct buffer_head *newfe_bh = NULL;
1016 struct buffer_head *old_inode_bh = NULL;
1017 struct buffer_head *insert_entry_bh = NULL;
1018 struct ocfs2_super *osb = NULL;
1019 u64 newfe_blkno, old_de_ino;
1020 handle_t *handle = NULL;
1021 struct buffer_head *old_dir_bh = NULL;
1022 struct buffer_head *new_dir_bh = NULL;
1023 struct ocfs2_dir_entry *old_inode_dot_dot_de = NULL, *old_de = NULL,
1024 *new_de = NULL;
1025 struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
1026 struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
1027 // this is the 1st dirent bh
1028 nlink_t old_dir_nlink = old_dir->i_nlink;
1029 struct ocfs2_dinode *old_di;
1030
1031 /* At some point it might be nice to break this function up a
1032 * bit. */
1033
1034 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
1035 old_dir, old_dentry, new_dir, new_dentry,
1036 old_dentry->d_name.len, old_dentry->d_name.name,
1037 new_dentry->d_name.len, new_dentry->d_name.name);
1038
1039 osb = OCFS2_SB(old_dir->i_sb);
1040
1041 if (new_inode) {
1042 if (!igrab(new_inode))
1043 BUG();
1044 }
1045
1046 /* Assume a directory hierarchy thusly:
1047 * a/b/c
1048 * a/d
1049 * a,b,c, and d are all directories.
1050 *
1051 * from cwd of 'a' on both nodes:
1052 * node1: mv b/c d
1053 * node2: mv d b/c
1054 *
1055 * And that's why, just like the VFS, we need a file system
1056 * rename lock. */
1057 if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
1058 status = ocfs2_rename_lock(osb);
1059 if (status < 0) {
1060 mlog_errno(status);
1061 goto bail;
1062 }
1063 rename_lock = 1;
1064 }
1065
1066 /* if old and new are the same, this'll just do one lock. */
1067 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1068 &new_dir_bh, new_dir);
1069 if (status < 0) {
1070 mlog_errno(status);
1071 goto bail;
1072 }
1073 parents_locked = 1;
1074
1075 /* make sure both dirs have bhs
1076 * get an extra ref on old_dir_bh if old==new */
1077 if (!new_dir_bh) {
1078 if (old_dir_bh) {
1079 new_dir_bh = old_dir_bh;
1080 get_bh(new_dir_bh);
1081 } else {
1082 mlog(ML_ERROR, "no old_dir_bh!\n");
1083 status = -EIO;
1084 goto bail;
1085 }
1086 }
1087
1088 /*
1089 * Aside from allowing a meta data update, the locking here
1090 * also ensures that the downconvert thread on other nodes
1091 * won't have to concurrently downconvert the inode and the
1092 * dentry locks.
1093 */
1094 status = ocfs2_inode_lock(old_inode, &old_inode_bh, 1);
1095 if (status < 0) {
1096 if (status != -ENOENT)
1097 mlog_errno(status);
1098 goto bail;
1099 }
1100 old_child_locked = 1;
1101
1102 status = ocfs2_remote_dentry_delete(old_dentry);
1103 if (status < 0) {
1104 mlog_errno(status);
1105 goto bail;
1106 }
1107
1108 if (S_ISDIR(old_inode->i_mode)) {
1109 u64 old_inode_parent;
1110
1111 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1112 old_inode, &old_inode_de_bh,
1113 &old_inode_dot_dot_de);
1114 if (status) {
1115 status = -EIO;
1116 goto bail;
1117 }
1118
1119 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1120 status = -EIO;
1121 goto bail;
1122 }
1123
1124 if (!new_inode && new_dir != old_dir &&
1125 new_dir->i_nlink >= OCFS2_LINK_MAX) {
1126 status = -EMLINK;
1127 goto bail;
1128 }
1129 }
1130
1131 status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1132 old_dentry->d_name.len,
1133 &old_de_ino);
1134 if (status) {
1135 status = -ENOENT;
1136 goto bail;
1137 }
1138
1139 /*
1140 * Check for inode number is _not_ due to possible IO errors.
1141 * We might rmdir the source, keep it as pwd of some process
1142 * and merrily kill the link to whatever was created under the
1143 * same name. Goodbye sticky bit ;-<
1144 */
1145 if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1146 status = -ENOENT;
1147 goto bail;
1148 }
1149
1150 /* check if the target already exists (in which case we need
1151 * to delete it */
1152 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1153 new_dentry->d_name.len,
1154 &newfe_blkno, new_dir, &new_de_bh,
1155 &new_de);
1156 /* The only error we allow here is -ENOENT because the new
1157 * file not existing is perfectly valid. */
1158 if ((status < 0) && (status != -ENOENT)) {
1159 /* If we cannot find the file specified we should just */
1160 /* return the error... */
1161 mlog_errno(status);
1162 goto bail;
1163 }
1164
1165 if (!new_de && new_inode) {
1166 /*
1167 * Target was unlinked by another node while we were
1168 * waiting to get to ocfs2_rename(). There isn't
1169 * anything we can do here to help the situation, so
1170 * bubble up the appropriate error.
1171 */
1172 status = -ENOENT;
1173 goto bail;
1174 }
1175
1176 /* In case we need to overwrite an existing file, we blow it
1177 * away first */
1178 if (new_de) {
1179 /* VFS didn't think there existed an inode here, but
1180 * someone else in the cluster must have raced our
1181 * rename to create one. Today we error cleanly, in
1182 * the future we should consider calling iget to build
1183 * a new struct inode for this entry. */
1184 if (!new_inode) {
1185 status = -EACCES;
1186
1187 mlog(0, "We found an inode for name %.*s but VFS "
1188 "didn't give us one.\n", new_dentry->d_name.len,
1189 new_dentry->d_name.name);
1190 goto bail;
1191 }
1192
1193 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1194 status = -EACCES;
1195
1196 mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1197 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1198 (unsigned long long)newfe_blkno,
1199 OCFS2_I(new_inode)->ip_flags);
1200 goto bail;
1201 }
1202
1203 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1204 if (status < 0) {
1205 if (status != -ENOENT)
1206 mlog_errno(status);
1207 goto bail;
1208 }
1209 new_child_locked = 1;
1210
1211 status = ocfs2_remote_dentry_delete(new_dentry);
1212 if (status < 0) {
1213 mlog_errno(status);
1214 goto bail;
1215 }
1216
1217 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1218
1219 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1220 "newfebh=%p bhblocknr=%llu\n", new_de,
1221 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1222 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1223
1224 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1225 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1226 new_inode,
1227 orphan_name,
1228 &orphan_entry_bh);
1229 if (status < 0) {
1230 mlog_errno(status);
1231 goto bail;
1232 }
1233 }
1234 } else {
1235 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1236
1237 status = ocfs2_check_dir_for_entry(new_dir,
1238 new_dentry->d_name.name,
1239 new_dentry->d_name.len);
1240 if (status)
1241 goto bail;
1242
1243 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1244 new_dentry->d_name.name,
1245 new_dentry->d_name.len,
1246 &insert_entry_bh);
1247 if (status < 0) {
1248 mlog_errno(status);
1249 goto bail;
1250 }
1251 }
1252
1253 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
1254 if (IS_ERR(handle)) {
1255 status = PTR_ERR(handle);
1256 handle = NULL;
1257 mlog_errno(status);
1258 goto bail;
1259 }
1260
1261 if (new_de) {
1262 if (S_ISDIR(new_inode->i_mode)) {
1263 if (!ocfs2_empty_dir(new_inode) ||
1264 new_inode->i_nlink != 2) {
1265 status = -ENOTEMPTY;
1266 goto bail;
1267 }
1268 }
1269 status = ocfs2_journal_access_di(handle, new_inode, newfe_bh,
1270 OCFS2_JOURNAL_ACCESS_WRITE);
1271 if (status < 0) {
1272 mlog_errno(status);
1273 goto bail;
1274 }
1275
1276 if (S_ISDIR(new_inode->i_mode) ||
1277 (newfe->i_links_count == cpu_to_le16(1))){
1278 status = ocfs2_orphan_add(osb, handle, new_inode,
1279 newfe, orphan_name,
1280 orphan_entry_bh, orphan_dir);
1281 if (status < 0) {
1282 mlog_errno(status);
1283 goto bail;
1284 }
1285 }
1286
1287 /* change the dirent to point to the correct inode */
1288 status = ocfs2_update_entry(new_dir, handle, new_de_bh,
1289 new_de, old_inode);
1290 if (status < 0) {
1291 mlog_errno(status);
1292 goto bail;
1293 }
1294 new_dir->i_version++;
1295
1296 if (S_ISDIR(new_inode->i_mode))
1297 newfe->i_links_count = 0;
1298 else
1299 le16_add_cpu(&newfe->i_links_count, -1);
1300
1301 status = ocfs2_journal_dirty(handle, newfe_bh);
1302 if (status < 0) {
1303 mlog_errno(status);
1304 goto bail;
1305 }
1306 } else {
1307 /* if the name was not found in new_dir, add it now */
1308 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1309 OCFS2_I(old_inode)->ip_blkno,
1310 new_dir_bh, insert_entry_bh);
1311 }
1312
1313 old_inode->i_ctime = CURRENT_TIME;
1314 mark_inode_dirty(old_inode);
1315
1316 status = ocfs2_journal_access_di(handle, old_inode, old_inode_bh,
1317 OCFS2_JOURNAL_ACCESS_WRITE);
1318 if (status >= 0) {
1319 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1320
1321 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1322 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1323
1324 status = ocfs2_journal_dirty(handle, old_inode_bh);
1325 if (status < 0)
1326 mlog_errno(status);
1327 } else
1328 mlog_errno(status);
1329
1330 /*
1331 * Now that the name has been added to new_dir, remove the old name.
1332 *
1333 * We don't keep any directory entry context around until now
1334 * because the insert might have changed the type of directory
1335 * we're dealing with.
1336 */
1337 old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1338 old_dentry->d_name.len,
1339 old_dir, &old_de);
1340 if (!old_de_bh) {
1341 status = -EIO;
1342 goto bail;
1343 }
1344
1345 status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1346 if (status < 0) {
1347 mlog_errno(status);
1348 goto bail;
1349 }
1350
1351 if (new_inode) {
1352 new_inode->i_nlink--;
1353 new_inode->i_ctime = CURRENT_TIME;
1354 }
1355 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1356 if (old_inode_de_bh) {
1357 status = ocfs2_update_entry(old_inode, handle, old_inode_de_bh,
1358 old_inode_dot_dot_de, new_dir);
1359 old_dir->i_nlink--;
1360 if (new_inode) {
1361 new_inode->i_nlink--;
1362 } else {
1363 inc_nlink(new_dir);
1364 mark_inode_dirty(new_dir);
1365 }
1366 }
1367 mark_inode_dirty(old_dir);
1368 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1369 if (new_inode) {
1370 mark_inode_dirty(new_inode);
1371 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1372 }
1373
1374 if (old_dir != new_dir) {
1375 /* Keep the same times on both directories.*/
1376 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1377
1378 /*
1379 * This will also pick up the i_nlink change from the
1380 * block above.
1381 */
1382 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1383 }
1384
1385 if (old_dir_nlink != old_dir->i_nlink) {
1386 if (!old_dir_bh) {
1387 mlog(ML_ERROR, "need to change nlink for old dir "
1388 "%llu from %d to %d but bh is NULL!\n",
1389 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1390 (int)old_dir_nlink, old_dir->i_nlink);
1391 } else {
1392 struct ocfs2_dinode *fe;
1393 status = ocfs2_journal_access_di(handle, old_dir,
1394 old_dir_bh,
1395 OCFS2_JOURNAL_ACCESS_WRITE);
1396 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1397 fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1398 status = ocfs2_journal_dirty(handle, old_dir_bh);
1399 }
1400 }
1401
1402 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1403 status = 0;
1404 bail:
1405 if (rename_lock)
1406 ocfs2_rename_unlock(osb);
1407
1408 if (handle)
1409 ocfs2_commit_trans(osb, handle);
1410
1411 if (parents_locked)
1412 ocfs2_double_unlock(old_dir, new_dir);
1413
1414 if (old_child_locked)
1415 ocfs2_inode_unlock(old_inode, 1);
1416
1417 if (new_child_locked)
1418 ocfs2_inode_unlock(new_inode, 1);
1419
1420 if (orphan_dir) {
1421 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1422 ocfs2_inode_unlock(orphan_dir, 1);
1423 mutex_unlock(&orphan_dir->i_mutex);
1424 iput(orphan_dir);
1425 }
1426
1427 if (new_inode)
1428 sync_mapping_buffers(old_inode->i_mapping);
1429
1430 if (new_inode)
1431 iput(new_inode);
1432 brelse(newfe_bh);
1433 brelse(old_inode_bh);
1434 brelse(old_dir_bh);
1435 brelse(new_dir_bh);
1436 brelse(new_de_bh);
1437 brelse(old_de_bh);
1438 brelse(old_inode_de_bh);
1439 brelse(orphan_entry_bh);
1440 brelse(insert_entry_bh);
1441
1442 mlog_exit(status);
1443
1444 return status;
1445 }
1446
1447 /*
1448 * we expect i_size = strlen(symname). Copy symname into the file
1449 * data, including the null terminator.
1450 */
1451 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1452 handle_t *handle,
1453 struct inode *inode,
1454 const char *symname)
1455 {
1456 struct buffer_head **bhs = NULL;
1457 const char *c;
1458 struct super_block *sb = osb->sb;
1459 u64 p_blkno, p_blocks;
1460 int virtual, blocks, status, i, bytes_left;
1461
1462 bytes_left = i_size_read(inode) + 1;
1463 /* we can't trust i_blocks because we're actually going to
1464 * write i_size + 1 bytes. */
1465 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1466
1467 mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1468 (unsigned long long)inode->i_blocks,
1469 i_size_read(inode), blocks);
1470
1471 /* Sanity check -- make sure we're going to fit. */
1472 if (bytes_left >
1473 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1474 status = -EIO;
1475 mlog_errno(status);
1476 goto bail;
1477 }
1478
1479 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1480 if (!bhs) {
1481 status = -ENOMEM;
1482 mlog_errno(status);
1483 goto bail;
1484 }
1485
1486 status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1487 NULL);
1488 if (status < 0) {
1489 mlog_errno(status);
1490 goto bail;
1491 }
1492
1493 /* links can never be larger than one cluster so we know this
1494 * is all going to be contiguous, but do a sanity check
1495 * anyway. */
1496 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1497 status = -EIO;
1498 mlog_errno(status);
1499 goto bail;
1500 }
1501
1502 virtual = 0;
1503 while(bytes_left > 0) {
1504 c = &symname[virtual * sb->s_blocksize];
1505
1506 bhs[virtual] = sb_getblk(sb, p_blkno);
1507 if (!bhs[virtual]) {
1508 status = -ENOMEM;
1509 mlog_errno(status);
1510 goto bail;
1511 }
1512 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1513
1514 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1515 OCFS2_JOURNAL_ACCESS_CREATE);
1516 if (status < 0) {
1517 mlog_errno(status);
1518 goto bail;
1519 }
1520
1521 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1522
1523 memcpy(bhs[virtual]->b_data, c,
1524 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1525 bytes_left);
1526
1527 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1528 if (status < 0) {
1529 mlog_errno(status);
1530 goto bail;
1531 }
1532
1533 virtual++;
1534 p_blkno++;
1535 bytes_left -= sb->s_blocksize;
1536 }
1537
1538 status = 0;
1539 bail:
1540
1541 if (bhs) {
1542 for(i = 0; i < blocks; i++)
1543 brelse(bhs[i]);
1544 kfree(bhs);
1545 }
1546
1547 mlog_exit(status);
1548 return status;
1549 }
1550
1551 static int ocfs2_symlink(struct inode *dir,
1552 struct dentry *dentry,
1553 const char *symname)
1554 {
1555 int status, l, credits;
1556 u64 newsize;
1557 struct ocfs2_super *osb = NULL;
1558 struct inode *inode = NULL;
1559 struct super_block *sb;
1560 struct buffer_head *new_fe_bh = NULL;
1561 struct buffer_head *de_bh = NULL;
1562 struct buffer_head *parent_fe_bh = NULL;
1563 struct ocfs2_dinode *fe = NULL;
1564 struct ocfs2_dinode *dirfe;
1565 handle_t *handle = NULL;
1566 struct ocfs2_alloc_context *inode_ac = NULL;
1567 struct ocfs2_alloc_context *data_ac = NULL;
1568 struct ocfs2_alloc_context *xattr_ac = NULL;
1569 int want_clusters = 0;
1570 int xattr_credits = 0;
1571 struct ocfs2_security_xattr_info si = {
1572 .enable = 1,
1573 };
1574 int did_quota = 0, did_quota_inode = 0;
1575
1576 mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1577 dentry, symname, dentry->d_name.len, dentry->d_name.name);
1578
1579 sb = dir->i_sb;
1580 osb = OCFS2_SB(sb);
1581
1582 l = strlen(symname) + 1;
1583
1584 credits = ocfs2_calc_symlink_credits(sb);
1585
1586 /* lock the parent directory */
1587 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1588 if (status < 0) {
1589 if (status != -ENOENT)
1590 mlog_errno(status);
1591 return status;
1592 }
1593
1594 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1595 if (!dirfe->i_links_count) {
1596 /* can't make a file in a deleted directory. */
1597 status = -ENOENT;
1598 goto bail;
1599 }
1600
1601 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1602 dentry->d_name.len);
1603 if (status)
1604 goto bail;
1605
1606 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1607 dentry->d_name.name,
1608 dentry->d_name.len, &de_bh);
1609 if (status < 0) {
1610 mlog_errno(status);
1611 goto bail;
1612 }
1613
1614 status = ocfs2_reserve_new_inode(osb, &inode_ac);
1615 if (status < 0) {
1616 if (status != -ENOSPC)
1617 mlog_errno(status);
1618 goto bail;
1619 }
1620
1621 inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
1622 if (!inode) {
1623 status = -ENOMEM;
1624 mlog_errno(status);
1625 goto bail;
1626 }
1627
1628 /* get security xattr */
1629 status = ocfs2_init_security_get(inode, dir, &si);
1630 if (status) {
1631 if (status == -EOPNOTSUPP)
1632 si.enable = 0;
1633 else {
1634 mlog_errno(status);
1635 goto bail;
1636 }
1637 }
1638
1639 /* calculate meta data/clusters for setting security xattr */
1640 if (si.enable) {
1641 status = ocfs2_calc_security_init(dir, &si, &want_clusters,
1642 &xattr_credits, &xattr_ac);
1643 if (status < 0) {
1644 mlog_errno(status);
1645 goto bail;
1646 }
1647 }
1648
1649 /* don't reserve bitmap space for fast symlinks. */
1650 if (l > ocfs2_fast_symlink_chars(sb))
1651 want_clusters += 1;
1652
1653 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
1654 if (status < 0) {
1655 if (status != -ENOSPC)
1656 mlog_errno(status);
1657 goto bail;
1658 }
1659
1660 handle = ocfs2_start_trans(osb, credits + xattr_credits);
1661 if (IS_ERR(handle)) {
1662 status = PTR_ERR(handle);
1663 handle = NULL;
1664 mlog_errno(status);
1665 goto bail;
1666 }
1667
1668 /* We don't use standard VFS wrapper because we don't want vfs_dq_init
1669 * to be called. */
1670 if (sb_any_quota_active(osb->sb) &&
1671 osb->sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA) {
1672 status = -EDQUOT;
1673 goto bail;
1674 }
1675 did_quota_inode = 1;
1676
1677 status = ocfs2_mknod_locked(osb, dir, inode, dentry,
1678 0, &new_fe_bh, parent_fe_bh, handle,
1679 inode_ac);
1680 if (status < 0) {
1681 mlog_errno(status);
1682 goto bail;
1683 }
1684
1685 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1686 inode->i_rdev = 0;
1687 newsize = l - 1;
1688 if (l > ocfs2_fast_symlink_chars(sb)) {
1689 u32 offset = 0;
1690
1691 inode->i_op = &ocfs2_symlink_inode_operations;
1692 if (vfs_dq_alloc_space_nodirty(inode,
1693 ocfs2_clusters_to_bytes(osb->sb, 1))) {
1694 status = -EDQUOT;
1695 goto bail;
1696 }
1697 did_quota = 1;
1698 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
1699 new_fe_bh,
1700 handle, data_ac, NULL,
1701 NULL);
1702 if (status < 0) {
1703 if (status != -ENOSPC && status != -EINTR) {
1704 mlog(ML_ERROR,
1705 "Failed to extend file to %llu\n",
1706 (unsigned long long)newsize);
1707 mlog_errno(status);
1708 status = -ENOSPC;
1709 }
1710 goto bail;
1711 }
1712 i_size_write(inode, newsize);
1713 inode->i_blocks = ocfs2_inode_sector_count(inode);
1714 } else {
1715 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1716 memcpy((char *) fe->id2.i_symlink, symname, l);
1717 i_size_write(inode, newsize);
1718 inode->i_blocks = 0;
1719 }
1720
1721 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1722 if (status < 0) {
1723 mlog_errno(status);
1724 goto bail;
1725 }
1726
1727 if (!ocfs2_inode_is_fast_symlink(inode)) {
1728 status = ocfs2_create_symlink_data(osb, handle, inode,
1729 symname);
1730 if (status < 0) {
1731 mlog_errno(status);
1732 goto bail;
1733 }
1734 }
1735
1736 if (si.enable) {
1737 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
1738 xattr_ac, data_ac);
1739 if (status < 0) {
1740 mlog_errno(status);
1741 goto bail;
1742 }
1743 }
1744
1745 status = ocfs2_add_entry(handle, dentry, inode,
1746 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1747 de_bh);
1748 if (status < 0) {
1749 mlog_errno(status);
1750 goto bail;
1751 }
1752
1753 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1754 if (status) {
1755 mlog_errno(status);
1756 goto bail;
1757 }
1758
1759 insert_inode_hash(inode);
1760 dentry->d_op = &ocfs2_dentry_ops;
1761 d_instantiate(dentry, inode);
1762 bail:
1763 if (status < 0 && did_quota)
1764 vfs_dq_free_space_nodirty(inode,
1765 ocfs2_clusters_to_bytes(osb->sb, 1));
1766 if (status < 0 && did_quota_inode)
1767 vfs_dq_free_inode(inode);
1768 if (handle)
1769 ocfs2_commit_trans(osb, handle);
1770
1771 ocfs2_inode_unlock(dir, 1);
1772
1773 brelse(new_fe_bh);
1774 brelse(parent_fe_bh);
1775 brelse(de_bh);
1776 kfree(si.name);
1777 kfree(si.value);
1778 if (inode_ac)
1779 ocfs2_free_alloc_context(inode_ac);
1780 if (data_ac)
1781 ocfs2_free_alloc_context(data_ac);
1782 if (xattr_ac)
1783 ocfs2_free_alloc_context(xattr_ac);
1784 if ((status < 0) && inode) {
1785 clear_nlink(inode);
1786 iput(inode);
1787 }
1788
1789 mlog_exit(status);
1790
1791 return status;
1792 }
1793
1794 static int ocfs2_blkno_stringify(u64 blkno, char *name)
1795 {
1796 int status, namelen;
1797
1798 mlog_entry_void();
1799
1800 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1801 (long long)blkno);
1802 if (namelen <= 0) {
1803 if (namelen)
1804 status = namelen;
1805 else
1806 status = -EINVAL;
1807 mlog_errno(status);
1808 goto bail;
1809 }
1810 if (namelen != OCFS2_ORPHAN_NAMELEN) {
1811 status = -EINVAL;
1812 mlog_errno(status);
1813 goto bail;
1814 }
1815
1816 mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
1817 namelen);
1818
1819 status = 0;
1820 bail:
1821 mlog_exit(status);
1822 return status;
1823 }
1824
1825 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
1826 struct inode **ret_orphan_dir,
1827 struct inode *inode,
1828 char *name,
1829 struct buffer_head **de_bh)
1830 {
1831 struct inode *orphan_dir_inode;
1832 struct buffer_head *orphan_dir_bh = NULL;
1833 int status = 0;
1834
1835 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1836 if (status < 0) {
1837 mlog_errno(status);
1838 return status;
1839 }
1840
1841 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
1842 ORPHAN_DIR_SYSTEM_INODE,
1843 osb->slot_num);
1844 if (!orphan_dir_inode) {
1845 status = -ENOENT;
1846 mlog_errno(status);
1847 return status;
1848 }
1849
1850 mutex_lock(&orphan_dir_inode->i_mutex);
1851
1852 status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
1853 if (status < 0) {
1854 mlog_errno(status);
1855 goto leave;
1856 }
1857
1858 status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
1859 orphan_dir_bh, name,
1860 OCFS2_ORPHAN_NAMELEN, de_bh);
1861 if (status < 0) {
1862 ocfs2_inode_unlock(orphan_dir_inode, 1);
1863
1864 mlog_errno(status);
1865 goto leave;
1866 }
1867
1868 *ret_orphan_dir = orphan_dir_inode;
1869
1870 leave:
1871 if (status) {
1872 mutex_unlock(&orphan_dir_inode->i_mutex);
1873 iput(orphan_dir_inode);
1874 }
1875
1876 brelse(orphan_dir_bh);
1877
1878 mlog_exit(status);
1879 return status;
1880 }
1881
1882 static int ocfs2_orphan_add(struct ocfs2_super *osb,
1883 handle_t *handle,
1884 struct inode *inode,
1885 struct ocfs2_dinode *fe,
1886 char *name,
1887 struct buffer_head *de_bh,
1888 struct inode *orphan_dir_inode)
1889 {
1890 struct buffer_head *orphan_dir_bh = NULL;
1891 int status = 0;
1892 struct ocfs2_dinode *orphan_fe;
1893
1894 mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
1895
1896 status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
1897 if (status < 0) {
1898 mlog_errno(status);
1899 goto leave;
1900 }
1901
1902 status = ocfs2_journal_access_di(handle, orphan_dir_inode, orphan_dir_bh,
1903 OCFS2_JOURNAL_ACCESS_WRITE);
1904 if (status < 0) {
1905 mlog_errno(status);
1906 goto leave;
1907 }
1908
1909 /* we're a cluster, and nlink can change on disk from
1910 * underneath us... */
1911 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1912 if (S_ISDIR(inode->i_mode))
1913 le16_add_cpu(&orphan_fe->i_links_count, 1);
1914 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
1915
1916 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
1917 if (status < 0) {
1918 mlog_errno(status);
1919 goto leave;
1920 }
1921
1922 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
1923 OCFS2_ORPHAN_NAMELEN, inode,
1924 OCFS2_I(inode)->ip_blkno,
1925 orphan_dir_bh, de_bh);
1926 if (status < 0) {
1927 mlog_errno(status);
1928 goto leave;
1929 }
1930
1931 le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
1932
1933 /* Record which orphan dir our inode now resides
1934 * in. delete_inode will use this to determine which orphan
1935 * dir to lock. */
1936 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
1937
1938 mlog(0, "Inode %llu orphaned in slot %d\n",
1939 (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
1940
1941 leave:
1942 brelse(orphan_dir_bh);
1943
1944 mlog_exit(status);
1945 return status;
1946 }
1947
1948 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
1949 int ocfs2_orphan_del(struct ocfs2_super *osb,
1950 handle_t *handle,
1951 struct inode *orphan_dir_inode,
1952 struct inode *inode,
1953 struct buffer_head *orphan_dir_bh)
1954 {
1955 char name[OCFS2_ORPHAN_NAMELEN + 1];
1956 struct ocfs2_dinode *orphan_fe;
1957 int status = 0;
1958 struct buffer_head *target_de_bh = NULL;
1959 struct ocfs2_dir_entry *target_de = NULL;
1960
1961 mlog_entry_void();
1962
1963 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1964 if (status < 0) {
1965 mlog_errno(status);
1966 goto leave;
1967 }
1968
1969 mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
1970 name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
1971 OCFS2_ORPHAN_NAMELEN);
1972
1973 /* find it's spot in the orphan directory */
1974 target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
1975 orphan_dir_inode, &target_de);
1976 if (!target_de_bh) {
1977 status = -ENOENT;
1978 mlog_errno(status);
1979 goto leave;
1980 }
1981
1982 /* remove it from the orphan directory */
1983 status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
1984 target_de_bh);
1985 if (status < 0) {
1986 mlog_errno(status);
1987 goto leave;
1988 }
1989
1990 status = ocfs2_journal_access_di(handle,orphan_dir_inode, orphan_dir_bh,
1991 OCFS2_JOURNAL_ACCESS_WRITE);
1992 if (status < 0) {
1993 mlog_errno(status);
1994 goto leave;
1995 }
1996
1997 /* do the i_nlink dance! :) */
1998 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1999 if (S_ISDIR(inode->i_mode))
2000 le16_add_cpu(&orphan_fe->i_links_count, -1);
2001 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2002
2003 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2004 if (status < 0) {
2005 mlog_errno(status);
2006 goto leave;
2007 }
2008
2009 leave:
2010 brelse(target_de_bh);
2011
2012 mlog_exit(status);
2013 return status;
2014 }
2015
2016 const struct inode_operations ocfs2_dir_iops = {
2017 .create = ocfs2_create,
2018 .lookup = ocfs2_lookup,
2019 .link = ocfs2_link,
2020 .unlink = ocfs2_unlink,
2021 .rmdir = ocfs2_unlink,
2022 .symlink = ocfs2_symlink,
2023 .mkdir = ocfs2_mkdir,
2024 .mknod = ocfs2_mknod,
2025 .rename = ocfs2_rename,
2026 .setattr = ocfs2_setattr,
2027 .getattr = ocfs2_getattr,
2028 .permission = ocfs2_permission,
2029 .setxattr = generic_setxattr,
2030 .getxattr = generic_getxattr,
2031 .listxattr = ocfs2_listxattr,
2032 .removexattr = generic_removexattr,
2033 };
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree