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[IA64] update sn2_defconfig
[deliverable/linux.git] / fs / ocfs2 / namei.c
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
44 #define MLOG_MASK_PREFIX ML_NAMEI
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 "vote.h"
64
65 #include "buffer_head_io.h"
66
67 #define NAMEI_RA_CHUNKS 2
68 #define NAMEI_RA_BLOCKS 4
69 #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
70 #define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
71
72 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
73 struct inode *dir,
74 const char *name, int namelen,
75 unsigned long offset,
76 struct ocfs2_dir_entry **res_dir);
77
78 static int ocfs2_delete_entry(handle_t *handle,
79 struct inode *dir,
80 struct ocfs2_dir_entry *de_del,
81 struct buffer_head *bh);
82
83 static int __ocfs2_add_entry(handle_t *handle,
84 struct inode *dir,
85 const char *name, int namelen,
86 struct inode *inode, u64 blkno,
87 struct buffer_head *parent_fe_bh,
88 struct buffer_head *insert_bh);
89
90 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
91 struct inode *dir,
92 struct dentry *dentry, int mode,
93 dev_t dev,
94 struct buffer_head **new_fe_bh,
95 struct buffer_head *parent_fe_bh,
96 handle_t *handle,
97 struct inode **ret_inode,
98 struct ocfs2_alloc_context *inode_ac);
99
100 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
101 handle_t *handle,
102 struct inode *parent,
103 struct inode *inode,
104 struct buffer_head *fe_bh,
105 struct ocfs2_alloc_context *data_ac);
106
107 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
108 struct inode **ret_orphan_dir,
109 struct inode *inode,
110 char *name,
111 struct buffer_head **de_bh);
112
113 static int ocfs2_orphan_add(struct ocfs2_super *osb,
114 handle_t *handle,
115 struct inode *inode,
116 struct ocfs2_dinode *fe,
117 char *name,
118 struct buffer_head *de_bh,
119 struct inode *orphan_dir_inode);
120
121 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
122 handle_t *handle,
123 struct inode *inode,
124 const char *symname);
125
126 static inline int ocfs2_add_entry(handle_t *handle,
127 struct dentry *dentry,
128 struct inode *inode, u64 blkno,
129 struct buffer_head *parent_fe_bh,
130 struct buffer_head *insert_bh)
131 {
132 return __ocfs2_add_entry(handle, dentry->d_parent->d_inode,
133 dentry->d_name.name, dentry->d_name.len,
134 inode, blkno, parent_fe_bh, insert_bh);
135 }
136
137 /* An orphan dir name is an 8 byte value, printed as a hex string */
138 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
139
140 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
141 struct nameidata *nd)
142 {
143 int status;
144 u64 blkno;
145 struct buffer_head *dirent_bh = NULL;
146 struct inode *inode = NULL;
147 struct dentry *ret;
148 struct ocfs2_dir_entry *dirent;
149 struct ocfs2_inode_info *oi;
150
151 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
152 dentry->d_name.len, dentry->d_name.name);
153
154 if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
155 ret = ERR_PTR(-ENAMETOOLONG);
156 goto bail;
157 }
158
159 mlog(0, "find name %.*s in directory %llu\n", dentry->d_name.len,
160 dentry->d_name.name, (unsigned long long)OCFS2_I(dir)->ip_blkno);
161
162 status = ocfs2_meta_lock(dir, NULL, 0);
163 if (status < 0) {
164 if (status != -ENOENT)
165 mlog_errno(status);
166 ret = ERR_PTR(status);
167 goto bail;
168 }
169
170 status = ocfs2_find_files_on_disk(dentry->d_name.name,
171 dentry->d_name.len, &blkno,
172 dir, &dirent_bh, &dirent);
173 if (status < 0)
174 goto bail_add;
175
176 inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0);
177 if (IS_ERR(inode)) {
178 ret = ERR_PTR(-EACCES);
179 goto bail_unlock;
180 }
181
182 oi = OCFS2_I(inode);
183 /* Clear any orphaned state... If we were able to look up the
184 * inode from a directory, it certainly can't be orphaned. We
185 * might have the bad state from a node which intended to
186 * orphan this inode but crashed before it could commit the
187 * unlink. */
188 spin_lock(&oi->ip_lock);
189 oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
190 spin_unlock(&oi->ip_lock);
191
192 bail_add:
193 dentry->d_op = &ocfs2_dentry_ops;
194 ret = d_splice_alias(inode, dentry);
195
196 if (inode) {
197 /*
198 * If d_splice_alias() finds a DCACHE_DISCONNECTED
199 * dentry, it will d_move() it on top of ourse. The
200 * return value will indicate this however, so in
201 * those cases, we switch them around for the locking
202 * code.
203 *
204 * NOTE: This dentry already has ->d_op set from
205 * ocfs2_get_parent() and ocfs2_get_dentry()
206 */
207 if (ret)
208 dentry = ret;
209
210 status = ocfs2_dentry_attach_lock(dentry, inode,
211 OCFS2_I(dir)->ip_blkno);
212 if (status) {
213 mlog_errno(status);
214 ret = ERR_PTR(status);
215 goto bail_unlock;
216 }
217 }
218
219 bail_unlock:
220 /* Don't drop the cluster lock until *after* the d_add --
221 * unlink on another node will message us to remove that
222 * dentry under this lock so otherwise we can race this with
223 * the vote thread and have a stale dentry. */
224 ocfs2_meta_unlock(dir, 0);
225
226 bail:
227 if (dirent_bh)
228 brelse(dirent_bh);
229
230 mlog_exit_ptr(ret);
231
232 return ret;
233 }
234
235 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
236 handle_t *handle,
237 struct inode *parent,
238 struct inode *inode,
239 struct buffer_head *fe_bh,
240 struct ocfs2_alloc_context *data_ac)
241 {
242 int status;
243 struct buffer_head *new_bh = NULL;
244 struct ocfs2_dir_entry *de = NULL;
245
246 mlog_entry_void();
247
248 status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
249 data_ac, NULL, &new_bh);
250 if (status < 0) {
251 mlog_errno(status);
252 goto bail;
253 }
254
255 ocfs2_set_new_buffer_uptodate(inode, new_bh);
256
257 status = ocfs2_journal_access(handle, inode, new_bh,
258 OCFS2_JOURNAL_ACCESS_CREATE);
259 if (status < 0) {
260 mlog_errno(status);
261 goto bail;
262 }
263 memset(new_bh->b_data, 0, osb->sb->s_blocksize);
264
265 de = (struct ocfs2_dir_entry *) new_bh->b_data;
266 de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
267 de->name_len = 1;
268 de->rec_len =
269 cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
270 strcpy(de->name, ".");
271 ocfs2_set_de_type(de, S_IFDIR);
272 de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
273 de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
274 de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize -
275 OCFS2_DIR_REC_LEN(1));
276 de->name_len = 2;
277 strcpy(de->name, "..");
278 ocfs2_set_de_type(de, S_IFDIR);
279
280 status = ocfs2_journal_dirty(handle, new_bh);
281 if (status < 0) {
282 mlog_errno(status);
283 goto bail;
284 }
285
286 i_size_write(inode, inode->i_sb->s_blocksize);
287 inode->i_nlink = 2;
288 inode->i_blocks = ocfs2_inode_sector_count(inode);
289 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
290 if (status < 0) {
291 mlog_errno(status);
292 goto bail;
293 }
294
295 status = 0;
296 bail:
297 if (new_bh)
298 brelse(new_bh);
299
300 mlog_exit(status);
301 return status;
302 }
303
304 static int ocfs2_mknod(struct inode *dir,
305 struct dentry *dentry,
306 int mode,
307 dev_t dev)
308 {
309 int status = 0;
310 struct buffer_head *parent_fe_bh = NULL;
311 handle_t *handle = NULL;
312 struct ocfs2_super *osb;
313 struct ocfs2_dinode *dirfe;
314 struct buffer_head *new_fe_bh = NULL;
315 struct buffer_head *de_bh = NULL;
316 struct inode *inode = NULL;
317 struct ocfs2_alloc_context *inode_ac = NULL;
318 struct ocfs2_alloc_context *data_ac = NULL;
319
320 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
321 (unsigned long)dev, dentry->d_name.len,
322 dentry->d_name.name);
323
324 /* get our super block */
325 osb = OCFS2_SB(dir->i_sb);
326
327 status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
328 if (status < 0) {
329 if (status != -ENOENT)
330 mlog_errno(status);
331 return status;
332 }
333
334 if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
335 status = -EMLINK;
336 goto leave;
337 }
338
339 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
340 if (!dirfe->i_links_count) {
341 /* can't make a file in a deleted directory. */
342 status = -ENOENT;
343 goto leave;
344 }
345
346 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
347 dentry->d_name.len);
348 if (status)
349 goto leave;
350
351 /* get a spot inside the dir. */
352 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
353 dentry->d_name.name,
354 dentry->d_name.len, &de_bh);
355 if (status < 0) {
356 mlog_errno(status);
357 goto leave;
358 }
359
360 /* reserve an inode spot */
361 status = ocfs2_reserve_new_inode(osb, &inode_ac);
362 if (status < 0) {
363 if (status != -ENOSPC)
364 mlog_errno(status);
365 goto leave;
366 }
367
368 /* are we making a directory? If so, reserve a cluster for his
369 * 1st extent. */
370 if (S_ISDIR(mode)) {
371 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
372 if (status < 0) {
373 if (status != -ENOSPC)
374 mlog_errno(status);
375 goto leave;
376 }
377 }
378
379 handle = ocfs2_start_trans(osb, OCFS2_MKNOD_CREDITS);
380 if (IS_ERR(handle)) {
381 status = PTR_ERR(handle);
382 handle = NULL;
383 mlog_errno(status);
384 goto leave;
385 }
386
387 /* do the real work now. */
388 status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
389 &new_fe_bh, parent_fe_bh, handle,
390 &inode, inode_ac);
391 if (status < 0) {
392 mlog_errno(status);
393 goto leave;
394 }
395
396 if (S_ISDIR(mode)) {
397 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
398 new_fe_bh, data_ac);
399 if (status < 0) {
400 mlog_errno(status);
401 goto leave;
402 }
403
404 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
405 OCFS2_JOURNAL_ACCESS_WRITE);
406 if (status < 0) {
407 mlog_errno(status);
408 goto leave;
409 }
410 le16_add_cpu(&dirfe->i_links_count, 1);
411 status = ocfs2_journal_dirty(handle, parent_fe_bh);
412 if (status < 0) {
413 mlog_errno(status);
414 goto leave;
415 }
416 inc_nlink(dir);
417 }
418
419 status = ocfs2_add_entry(handle, dentry, inode,
420 OCFS2_I(inode)->ip_blkno, parent_fe_bh,
421 de_bh);
422 if (status < 0) {
423 mlog_errno(status);
424 goto leave;
425 }
426
427 status = ocfs2_dentry_attach_lock(dentry, inode,
428 OCFS2_I(dir)->ip_blkno);
429 if (status) {
430 mlog_errno(status);
431 goto leave;
432 }
433
434 insert_inode_hash(inode);
435 dentry->d_op = &ocfs2_dentry_ops;
436 d_instantiate(dentry, inode);
437 status = 0;
438 leave:
439 if (handle)
440 ocfs2_commit_trans(osb, handle);
441
442 ocfs2_meta_unlock(dir, 1);
443
444 if (status == -ENOSPC)
445 mlog(0, "Disk is full\n");
446
447 if (new_fe_bh)
448 brelse(new_fe_bh);
449
450 if (de_bh)
451 brelse(de_bh);
452
453 if (parent_fe_bh)
454 brelse(parent_fe_bh);
455
456 if ((status < 0) && inode)
457 iput(inode);
458
459 if (inode_ac)
460 ocfs2_free_alloc_context(inode_ac);
461
462 if (data_ac)
463 ocfs2_free_alloc_context(data_ac);
464
465 mlog_exit(status);
466
467 return status;
468 }
469
470 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
471 struct inode *dir,
472 struct dentry *dentry, int mode,
473 dev_t dev,
474 struct buffer_head **new_fe_bh,
475 struct buffer_head *parent_fe_bh,
476 handle_t *handle,
477 struct inode **ret_inode,
478 struct ocfs2_alloc_context *inode_ac)
479 {
480 int status = 0;
481 struct ocfs2_dinode *fe = NULL;
482 struct ocfs2_extent_list *fel;
483 u64 fe_blkno = 0;
484 u16 suballoc_bit;
485 struct inode *inode = NULL;
486
487 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
488 (unsigned long)dev, dentry->d_name.len,
489 dentry->d_name.name);
490
491 *new_fe_bh = NULL;
492 *ret_inode = NULL;
493
494 status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
495 &fe_blkno);
496 if (status < 0) {
497 mlog_errno(status);
498 goto leave;
499 }
500
501 inode = new_inode(dir->i_sb);
502 if (IS_ERR(inode)) {
503 status = PTR_ERR(inode);
504 mlog(ML_ERROR, "new_inode failed!\n");
505 goto leave;
506 }
507
508 /* populate as many fields early on as possible - many of
509 * these are used by the support functions here and in
510 * callers. */
511 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
512 OCFS2_I(inode)->ip_blkno = fe_blkno;
513 if (S_ISDIR(mode))
514 inode->i_nlink = 2;
515 else
516 inode->i_nlink = 1;
517 inode->i_mode = mode;
518 spin_lock(&osb->osb_lock);
519 inode->i_generation = osb->s_next_generation++;
520 spin_unlock(&osb->osb_lock);
521
522 *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
523 if (!*new_fe_bh) {
524 status = -EIO;
525 mlog_errno(status);
526 goto leave;
527 }
528 ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
529
530 status = ocfs2_journal_access(handle, inode, *new_fe_bh,
531 OCFS2_JOURNAL_ACCESS_CREATE);
532 if (status < 0) {
533 mlog_errno(status);
534 goto leave;
535 }
536
537 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
538 memset(fe, 0, osb->sb->s_blocksize);
539
540 fe->i_generation = cpu_to_le32(inode->i_generation);
541 fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
542 fe->i_blkno = cpu_to_le64(fe_blkno);
543 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
544 fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
545 fe->i_uid = cpu_to_le32(current->fsuid);
546 if (dir->i_mode & S_ISGID) {
547 fe->i_gid = cpu_to_le32(dir->i_gid);
548 if (S_ISDIR(mode))
549 mode |= S_ISGID;
550 } else
551 fe->i_gid = cpu_to_le32(current->fsgid);
552 fe->i_mode = cpu_to_le16(mode);
553 if (S_ISCHR(mode) || S_ISBLK(mode))
554 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
555
556 fe->i_links_count = cpu_to_le16(inode->i_nlink);
557
558 fe->i_last_eb_blk = 0;
559 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
560 le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
561 fe->i_atime = fe->i_ctime = fe->i_mtime =
562 cpu_to_le64(CURRENT_TIME.tv_sec);
563 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
564 cpu_to_le32(CURRENT_TIME.tv_nsec);
565 fe->i_dtime = 0;
566
567 fel = &fe->id2.i_list;
568 fel->l_tree_depth = 0;
569 fel->l_next_free_rec = 0;
570 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
571
572 status = ocfs2_journal_dirty(handle, *new_fe_bh);
573 if (status < 0) {
574 mlog_errno(status);
575 goto leave;
576 }
577
578 if (ocfs2_populate_inode(inode, fe, 1) < 0) {
579 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
580 "i_blkno=%llu, i_ino=%lu\n",
581 (unsigned long long)(*new_fe_bh)->b_blocknr,
582 (unsigned long long)le64_to_cpu(fe->i_blkno),
583 inode->i_ino);
584 BUG();
585 }
586
587 ocfs2_inode_set_new(osb, inode);
588 if (!ocfs2_mount_local(osb)) {
589 status = ocfs2_create_new_inode_locks(inode);
590 if (status < 0)
591 mlog_errno(status);
592 }
593
594 status = 0; /* error in ocfs2_create_new_inode_locks is not
595 * critical */
596
597 *ret_inode = inode;
598 leave:
599 if (status < 0) {
600 if (*new_fe_bh) {
601 brelse(*new_fe_bh);
602 *new_fe_bh = NULL;
603 }
604 if (inode)
605 iput(inode);
606 }
607
608 mlog_exit(status);
609 return status;
610 }
611
612 static int ocfs2_mkdir(struct inode *dir,
613 struct dentry *dentry,
614 int mode)
615 {
616 int ret;
617
618 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
619 dentry->d_name.len, dentry->d_name.name);
620 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
621 mlog_exit(ret);
622
623 return ret;
624 }
625
626 static int ocfs2_create(struct inode *dir,
627 struct dentry *dentry,
628 int mode,
629 struct nameidata *nd)
630 {
631 int ret;
632
633 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
634 dentry->d_name.len, dentry->d_name.name);
635 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
636 mlog_exit(ret);
637
638 return ret;
639 }
640
641 static int ocfs2_link(struct dentry *old_dentry,
642 struct inode *dir,
643 struct dentry *dentry)
644 {
645 handle_t *handle;
646 struct inode *inode = old_dentry->d_inode;
647 int err;
648 struct buffer_head *fe_bh = NULL;
649 struct buffer_head *parent_fe_bh = NULL;
650 struct buffer_head *de_bh = NULL;
651 struct ocfs2_dinode *fe = NULL;
652 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
653
654 mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
655 old_dentry->d_name.len, old_dentry->d_name.name,
656 dentry->d_name.len, dentry->d_name.name);
657
658 if (S_ISDIR(inode->i_mode))
659 return -EPERM;
660
661 err = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
662 if (err < 0) {
663 if (err != -ENOENT)
664 mlog_errno(err);
665 return err;
666 }
667
668 if (!dir->i_nlink) {
669 err = -ENOENT;
670 goto out;
671 }
672
673 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
674 dentry->d_name.len);
675 if (err)
676 goto out;
677
678 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
679 dentry->d_name.name,
680 dentry->d_name.len, &de_bh);
681 if (err < 0) {
682 mlog_errno(err);
683 goto out;
684 }
685
686 err = ocfs2_meta_lock(inode, &fe_bh, 1);
687 if (err < 0) {
688 if (err != -ENOENT)
689 mlog_errno(err);
690 goto out;
691 }
692
693 fe = (struct ocfs2_dinode *) fe_bh->b_data;
694 if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
695 err = -EMLINK;
696 goto out_unlock_inode;
697 }
698
699 handle = ocfs2_start_trans(osb, OCFS2_LINK_CREDITS);
700 if (IS_ERR(handle)) {
701 err = PTR_ERR(handle);
702 handle = NULL;
703 mlog_errno(err);
704 goto out_unlock_inode;
705 }
706
707 err = ocfs2_journal_access(handle, inode, fe_bh,
708 OCFS2_JOURNAL_ACCESS_WRITE);
709 if (err < 0) {
710 mlog_errno(err);
711 goto out_commit;
712 }
713
714 inc_nlink(inode);
715 inode->i_ctime = CURRENT_TIME;
716 fe->i_links_count = cpu_to_le16(inode->i_nlink);
717 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
718 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
719
720 err = ocfs2_journal_dirty(handle, fe_bh);
721 if (err < 0) {
722 le16_add_cpu(&fe->i_links_count, -1);
723 drop_nlink(inode);
724 mlog_errno(err);
725 goto out_commit;
726 }
727
728 err = ocfs2_add_entry(handle, dentry, inode,
729 OCFS2_I(inode)->ip_blkno,
730 parent_fe_bh, de_bh);
731 if (err) {
732 le16_add_cpu(&fe->i_links_count, -1);
733 drop_nlink(inode);
734 mlog_errno(err);
735 goto out_commit;
736 }
737
738 err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
739 if (err) {
740 mlog_errno(err);
741 goto out_commit;
742 }
743
744 atomic_inc(&inode->i_count);
745 dentry->d_op = &ocfs2_dentry_ops;
746 d_instantiate(dentry, inode);
747
748 out_commit:
749 ocfs2_commit_trans(osb, handle);
750 out_unlock_inode:
751 ocfs2_meta_unlock(inode, 1);
752
753 out:
754 ocfs2_meta_unlock(dir, 1);
755
756 if (de_bh)
757 brelse(de_bh);
758 if (fe_bh)
759 brelse(fe_bh);
760 if (parent_fe_bh)
761 brelse(parent_fe_bh);
762
763 mlog_exit(err);
764
765 return err;
766 }
767
768 /*
769 * Takes and drops an exclusive lock on the given dentry. This will
770 * force other nodes to drop it.
771 */
772 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
773 {
774 int ret;
775
776 ret = ocfs2_dentry_lock(dentry, 1);
777 if (ret)
778 mlog_errno(ret);
779 else
780 ocfs2_dentry_unlock(dentry, 1);
781
782 return ret;
783 }
784
785 static inline int inode_is_unlinkable(struct inode *inode)
786 {
787 if (S_ISDIR(inode->i_mode)) {
788 if (inode->i_nlink == 2)
789 return 1;
790 return 0;
791 }
792
793 if (inode->i_nlink == 1)
794 return 1;
795 return 0;
796 }
797
798 static int ocfs2_unlink(struct inode *dir,
799 struct dentry *dentry)
800 {
801 int status;
802 int child_locked = 0;
803 struct inode *inode = dentry->d_inode;
804 struct inode *orphan_dir = NULL;
805 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
806 u64 blkno;
807 struct ocfs2_dinode *fe = NULL;
808 struct buffer_head *fe_bh = NULL;
809 struct buffer_head *parent_node_bh = NULL;
810 handle_t *handle = NULL;
811 struct ocfs2_dir_entry *dirent = NULL;
812 struct buffer_head *dirent_bh = NULL;
813 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
814 struct buffer_head *orphan_entry_bh = NULL;
815
816 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
817 dentry->d_name.len, dentry->d_name.name);
818
819 BUG_ON(dentry->d_parent->d_inode != dir);
820
821 mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
822
823 if (inode == osb->root_inode) {
824 mlog(0, "Cannot delete the root directory\n");
825 return -EPERM;
826 }
827
828 status = ocfs2_meta_lock(dir, &parent_node_bh, 1);
829 if (status < 0) {
830 if (status != -ENOENT)
831 mlog_errno(status);
832 return status;
833 }
834
835 status = ocfs2_find_files_on_disk(dentry->d_name.name,
836 dentry->d_name.len, &blkno,
837 dir, &dirent_bh, &dirent);
838 if (status < 0) {
839 if (status != -ENOENT)
840 mlog_errno(status);
841 goto leave;
842 }
843
844 if (OCFS2_I(inode)->ip_blkno != blkno) {
845 status = -ENOENT;
846
847 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
848 (unsigned long long)OCFS2_I(inode)->ip_blkno,
849 (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
850 goto leave;
851 }
852
853 status = ocfs2_meta_lock(inode, &fe_bh, 1);
854 if (status < 0) {
855 if (status != -ENOENT)
856 mlog_errno(status);
857 goto leave;
858 }
859 child_locked = 1;
860
861 if (S_ISDIR(inode->i_mode)) {
862 if (!ocfs2_empty_dir(inode)) {
863 status = -ENOTEMPTY;
864 goto leave;
865 } else if (inode->i_nlink != 2) {
866 status = -ENOTEMPTY;
867 goto leave;
868 }
869 }
870
871 status = ocfs2_remote_dentry_delete(dentry);
872 if (status < 0) {
873 /* This vote should succeed under all normal
874 * circumstances. */
875 mlog_errno(status);
876 goto leave;
877 }
878
879 if (inode_is_unlinkable(inode)) {
880 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
881 orphan_name,
882 &orphan_entry_bh);
883 if (status < 0) {
884 mlog_errno(status);
885 goto leave;
886 }
887 }
888
889 handle = ocfs2_start_trans(osb, OCFS2_UNLINK_CREDITS);
890 if (IS_ERR(handle)) {
891 status = PTR_ERR(handle);
892 handle = NULL;
893 mlog_errno(status);
894 goto leave;
895 }
896
897 status = ocfs2_journal_access(handle, inode, fe_bh,
898 OCFS2_JOURNAL_ACCESS_WRITE);
899 if (status < 0) {
900 mlog_errno(status);
901 goto leave;
902 }
903
904 fe = (struct ocfs2_dinode *) fe_bh->b_data;
905
906 if (inode_is_unlinkable(inode)) {
907 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
908 orphan_entry_bh, orphan_dir);
909 if (status < 0) {
910 mlog_errno(status);
911 goto leave;
912 }
913 }
914
915 /* delete the name from the parent dir */
916 status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
917 if (status < 0) {
918 mlog_errno(status);
919 goto leave;
920 }
921
922 if (S_ISDIR(inode->i_mode))
923 drop_nlink(inode);
924 drop_nlink(inode);
925 fe->i_links_count = cpu_to_le16(inode->i_nlink);
926
927 status = ocfs2_journal_dirty(handle, fe_bh);
928 if (status < 0) {
929 mlog_errno(status);
930 goto leave;
931 }
932
933 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
934 if (S_ISDIR(inode->i_mode))
935 drop_nlink(dir);
936
937 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
938 if (status < 0) {
939 mlog_errno(status);
940 if (S_ISDIR(inode->i_mode))
941 inc_nlink(dir);
942 }
943
944 leave:
945 if (handle)
946 ocfs2_commit_trans(osb, handle);
947
948 if (child_locked)
949 ocfs2_meta_unlock(inode, 1);
950
951 ocfs2_meta_unlock(dir, 1);
952
953 if (orphan_dir) {
954 /* This was locked for us in ocfs2_prepare_orphan_dir() */
955 ocfs2_meta_unlock(orphan_dir, 1);
956 mutex_unlock(&orphan_dir->i_mutex);
957 iput(orphan_dir);
958 }
959
960 if (fe_bh)
961 brelse(fe_bh);
962
963 if (dirent_bh)
964 brelse(dirent_bh);
965
966 if (parent_node_bh)
967 brelse(parent_node_bh);
968
969 if (orphan_entry_bh)
970 brelse(orphan_entry_bh);
971
972 mlog_exit(status);
973
974 return status;
975 }
976
977 /*
978 * The only place this should be used is rename!
979 * if they have the same id, then the 1st one is the only one locked.
980 */
981 static int ocfs2_double_lock(struct ocfs2_super *osb,
982 struct buffer_head **bh1,
983 struct inode *inode1,
984 struct buffer_head **bh2,
985 struct inode *inode2)
986 {
987 int status;
988 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
989 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
990 struct buffer_head **tmpbh;
991 struct inode *tmpinode;
992
993 mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
994 (unsigned long long)oi1->ip_blkno,
995 (unsigned long long)oi2->ip_blkno);
996
997 if (*bh1)
998 *bh1 = NULL;
999 if (*bh2)
1000 *bh2 = NULL;
1001
1002 /* we always want to lock the one with the lower lockid first. */
1003 if (oi1->ip_blkno != oi2->ip_blkno) {
1004 if (oi1->ip_blkno < oi2->ip_blkno) {
1005 /* switch id1 and id2 around */
1006 mlog(0, "switching them around...\n");
1007 tmpbh = bh2;
1008 bh2 = bh1;
1009 bh1 = tmpbh;
1010
1011 tmpinode = inode2;
1012 inode2 = inode1;
1013 inode1 = tmpinode;
1014 }
1015 /* lock id2 */
1016 status = ocfs2_meta_lock(inode2, bh2, 1);
1017 if (status < 0) {
1018 if (status != -ENOENT)
1019 mlog_errno(status);
1020 goto bail;
1021 }
1022 }
1023
1024 /* lock id1 */
1025 status = ocfs2_meta_lock(inode1, bh1, 1);
1026 if (status < 0) {
1027 /*
1028 * An error return must mean that no cluster locks
1029 * were held on function exit.
1030 */
1031 if (oi1->ip_blkno != oi2->ip_blkno)
1032 ocfs2_meta_unlock(inode2, 1);
1033
1034 if (status != -ENOENT)
1035 mlog_errno(status);
1036 }
1037
1038 bail:
1039 mlog_exit(status);
1040 return status;
1041 }
1042
1043 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1044 {
1045 ocfs2_meta_unlock(inode1, 1);
1046
1047 if (inode1 != inode2)
1048 ocfs2_meta_unlock(inode2, 1);
1049 }
1050
1051 #define PARENT_INO(buffer) \
1052 ((struct ocfs2_dir_entry *) \
1053 ((char *)buffer + \
1054 le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode
1055
1056 static int ocfs2_rename(struct inode *old_dir,
1057 struct dentry *old_dentry,
1058 struct inode *new_dir,
1059 struct dentry *new_dentry)
1060 {
1061 int status = 0, rename_lock = 0, parents_locked = 0;
1062 int old_child_locked = 0, new_child_locked = 0;
1063 struct inode *old_inode = old_dentry->d_inode;
1064 struct inode *new_inode = new_dentry->d_inode;
1065 struct inode *orphan_dir = NULL;
1066 struct ocfs2_dinode *newfe = NULL;
1067 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1068 struct buffer_head *orphan_entry_bh = NULL;
1069 struct buffer_head *newfe_bh = NULL;
1070 struct buffer_head *old_inode_bh = NULL;
1071 struct buffer_head *insert_entry_bh = NULL;
1072 struct ocfs2_super *osb = NULL;
1073 u64 newfe_blkno;
1074 handle_t *handle = NULL;
1075 struct buffer_head *old_dir_bh = NULL;
1076 struct buffer_head *new_dir_bh = NULL;
1077 struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry
1078 // and new_dentry
1079 struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
1080 struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
1081 // this is the 1st dirent bh
1082 nlink_t old_dir_nlink = old_dir->i_nlink;
1083 struct ocfs2_dinode *old_di;
1084
1085 /* At some point it might be nice to break this function up a
1086 * bit. */
1087
1088 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
1089 old_dir, old_dentry, new_dir, new_dentry,
1090 old_dentry->d_name.len, old_dentry->d_name.name,
1091 new_dentry->d_name.len, new_dentry->d_name.name);
1092
1093 osb = OCFS2_SB(old_dir->i_sb);
1094
1095 if (new_inode) {
1096 if (!igrab(new_inode))
1097 BUG();
1098 }
1099
1100 /* Assume a directory hierarchy thusly:
1101 * a/b/c
1102 * a/d
1103 * a,b,c, and d are all directories.
1104 *
1105 * from cwd of 'a' on both nodes:
1106 * node1: mv b/c d
1107 * node2: mv d b/c
1108 *
1109 * And that's why, just like the VFS, we need a file system
1110 * rename lock. */
1111 if (old_dentry != new_dentry) {
1112 status = ocfs2_rename_lock(osb);
1113 if (status < 0) {
1114 mlog_errno(status);
1115 goto bail;
1116 }
1117 rename_lock = 1;
1118 }
1119
1120 /* if old and new are the same, this'll just do one lock. */
1121 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1122 &new_dir_bh, new_dir);
1123 if (status < 0) {
1124 mlog_errno(status);
1125 goto bail;
1126 }
1127 parents_locked = 1;
1128
1129 /* make sure both dirs have bhs
1130 * get an extra ref on old_dir_bh if old==new */
1131 if (!new_dir_bh) {
1132 if (old_dir_bh) {
1133 new_dir_bh = old_dir_bh;
1134 get_bh(new_dir_bh);
1135 } else {
1136 mlog(ML_ERROR, "no old_dir_bh!\n");
1137 status = -EIO;
1138 goto bail;
1139 }
1140 }
1141
1142 /*
1143 * Aside from allowing a meta data update, the locking here
1144 * also ensures that the vote thread on other nodes won't have
1145 * to concurrently downconvert the inode and the dentry locks.
1146 */
1147 status = ocfs2_meta_lock(old_inode, &old_inode_bh, 1);
1148 if (status < 0) {
1149 if (status != -ENOENT)
1150 mlog_errno(status);
1151 goto bail;
1152 }
1153 old_child_locked = 1;
1154
1155 status = ocfs2_remote_dentry_delete(old_dentry);
1156 if (status < 0) {
1157 mlog_errno(status);
1158 goto bail;
1159 }
1160
1161 if (S_ISDIR(old_inode->i_mode)) {
1162 status = -EIO;
1163 old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0);
1164 if (!old_inode_de_bh)
1165 goto bail;
1166
1167 status = -EIO;
1168 if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) !=
1169 OCFS2_I(old_dir)->ip_blkno)
1170 goto bail;
1171 status = -EMLINK;
1172 if (!new_inode && new_dir!=old_dir &&
1173 new_dir->i_nlink >= OCFS2_LINK_MAX)
1174 goto bail;
1175 }
1176
1177 status = -ENOENT;
1178 old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1179 old_dentry->d_name.len,
1180 old_dir, &old_de);
1181 if (!old_de_bh)
1182 goto bail;
1183
1184 /*
1185 * Check for inode number is _not_ due to possible IO errors.
1186 * We might rmdir the source, keep it as pwd of some process
1187 * and merrily kill the link to whatever was created under the
1188 * same name. Goodbye sticky bit ;-<
1189 */
1190 if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno)
1191 goto bail;
1192
1193 /* check if the target already exists (in which case we need
1194 * to delete it */
1195 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1196 new_dentry->d_name.len,
1197 &newfe_blkno, new_dir, &new_de_bh,
1198 &new_de);
1199 /* The only error we allow here is -ENOENT because the new
1200 * file not existing is perfectly valid. */
1201 if ((status < 0) && (status != -ENOENT)) {
1202 /* If we cannot find the file specified we should just */
1203 /* return the error... */
1204 mlog_errno(status);
1205 goto bail;
1206 }
1207
1208 if (!new_de && new_inode)
1209 mlog(ML_ERROR, "inode %lu does not exist in it's parent "
1210 "directory!", new_inode->i_ino);
1211
1212 /* In case we need to overwrite an existing file, we blow it
1213 * away first */
1214 if (new_de) {
1215 /* VFS didn't think there existed an inode here, but
1216 * someone else in the cluster must have raced our
1217 * rename to create one. Today we error cleanly, in
1218 * the future we should consider calling iget to build
1219 * a new struct inode for this entry. */
1220 if (!new_inode) {
1221 status = -EACCES;
1222
1223 mlog(0, "We found an inode for name %.*s but VFS "
1224 "didn't give us one.\n", new_dentry->d_name.len,
1225 new_dentry->d_name.name);
1226 goto bail;
1227 }
1228
1229 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1230 status = -EACCES;
1231
1232 mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1233 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1234 (unsigned long long)newfe_blkno,
1235 OCFS2_I(new_inode)->ip_flags);
1236 goto bail;
1237 }
1238
1239 status = ocfs2_meta_lock(new_inode, &newfe_bh, 1);
1240 if (status < 0) {
1241 if (status != -ENOENT)
1242 mlog_errno(status);
1243 goto bail;
1244 }
1245 new_child_locked = 1;
1246
1247 status = ocfs2_remote_dentry_delete(new_dentry);
1248 if (status < 0) {
1249 mlog_errno(status);
1250 goto bail;
1251 }
1252
1253 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1254
1255 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1256 "newfebh=%p bhblocknr=%llu\n", new_de,
1257 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1258 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1259
1260 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1261 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1262 new_inode,
1263 orphan_name,
1264 &orphan_entry_bh);
1265 if (status < 0) {
1266 mlog_errno(status);
1267 goto bail;
1268 }
1269 }
1270 } else {
1271 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1272
1273 status = ocfs2_check_dir_for_entry(new_dir,
1274 new_dentry->d_name.name,
1275 new_dentry->d_name.len);
1276 if (status)
1277 goto bail;
1278
1279 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1280 new_dentry->d_name.name,
1281 new_dentry->d_name.len,
1282 &insert_entry_bh);
1283 if (status < 0) {
1284 mlog_errno(status);
1285 goto bail;
1286 }
1287 }
1288
1289 handle = ocfs2_start_trans(osb, OCFS2_RENAME_CREDITS);
1290 if (IS_ERR(handle)) {
1291 status = PTR_ERR(handle);
1292 handle = NULL;
1293 mlog_errno(status);
1294 goto bail;
1295 }
1296
1297 if (new_de) {
1298 if (S_ISDIR(new_inode->i_mode)) {
1299 if (!ocfs2_empty_dir(new_inode) ||
1300 new_inode->i_nlink != 2) {
1301 status = -ENOTEMPTY;
1302 goto bail;
1303 }
1304 }
1305 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1306 OCFS2_JOURNAL_ACCESS_WRITE);
1307 if (status < 0) {
1308 mlog_errno(status);
1309 goto bail;
1310 }
1311
1312 if (S_ISDIR(new_inode->i_mode) ||
1313 (newfe->i_links_count == cpu_to_le16(1))){
1314 status = ocfs2_orphan_add(osb, handle, new_inode,
1315 newfe, orphan_name,
1316 orphan_entry_bh, orphan_dir);
1317 if (status < 0) {
1318 mlog_errno(status);
1319 goto bail;
1320 }
1321 }
1322
1323 /* change the dirent to point to the correct inode */
1324 status = ocfs2_journal_access(handle, new_dir, new_de_bh,
1325 OCFS2_JOURNAL_ACCESS_WRITE);
1326 if (status < 0) {
1327 mlog_errno(status);
1328 goto bail;
1329 }
1330 new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno);
1331 new_de->file_type = old_de->file_type;
1332 new_dir->i_version++;
1333 status = ocfs2_journal_dirty(handle, new_de_bh);
1334 if (status < 0) {
1335 mlog_errno(status);
1336 goto bail;
1337 }
1338
1339 if (S_ISDIR(new_inode->i_mode))
1340 newfe->i_links_count = 0;
1341 else
1342 le16_add_cpu(&newfe->i_links_count, -1);
1343
1344 status = ocfs2_journal_dirty(handle, newfe_bh);
1345 if (status < 0) {
1346 mlog_errno(status);
1347 goto bail;
1348 }
1349 } else {
1350 /* if the name was not found in new_dir, add it now */
1351 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1352 OCFS2_I(old_inode)->ip_blkno,
1353 new_dir_bh, insert_entry_bh);
1354 }
1355
1356 old_inode->i_ctime = CURRENT_TIME;
1357 mark_inode_dirty(old_inode);
1358
1359 status = ocfs2_journal_access(handle, old_inode, old_inode_bh,
1360 OCFS2_JOURNAL_ACCESS_WRITE);
1361 if (status >= 0) {
1362 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1363
1364 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1365 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1366
1367 status = ocfs2_journal_dirty(handle, old_inode_bh);
1368 if (status < 0)
1369 mlog_errno(status);
1370 } else
1371 mlog_errno(status);
1372
1373 /* now that the name has been added to new_dir, remove the old name */
1374 status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1375 if (status < 0) {
1376 mlog_errno(status);
1377 goto bail;
1378 }
1379
1380 if (new_inode) {
1381 new_inode->i_nlink--;
1382 new_inode->i_ctime = CURRENT_TIME;
1383 }
1384 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1385 if (old_inode_de_bh) {
1386 status = ocfs2_journal_access(handle, old_inode,
1387 old_inode_de_bh,
1388 OCFS2_JOURNAL_ACCESS_WRITE);
1389 PARENT_INO(old_inode_de_bh->b_data) =
1390 cpu_to_le64(OCFS2_I(new_dir)->ip_blkno);
1391 status = ocfs2_journal_dirty(handle, old_inode_de_bh);
1392 old_dir->i_nlink--;
1393 if (new_inode) {
1394 new_inode->i_nlink--;
1395 } else {
1396 inc_nlink(new_dir);
1397 mark_inode_dirty(new_dir);
1398 }
1399 }
1400 mark_inode_dirty(old_dir);
1401 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1402 if (new_inode) {
1403 mark_inode_dirty(new_inode);
1404 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1405 }
1406
1407 if (old_dir != new_dir) {
1408 /* Keep the same times on both directories.*/
1409 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1410
1411 /*
1412 * This will also pick up the i_nlink change from the
1413 * block above.
1414 */
1415 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1416 }
1417
1418 if (old_dir_nlink != old_dir->i_nlink) {
1419 if (!old_dir_bh) {
1420 mlog(ML_ERROR, "need to change nlink for old dir "
1421 "%llu from %d to %d but bh is NULL!\n",
1422 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1423 (int)old_dir_nlink, old_dir->i_nlink);
1424 } else {
1425 struct ocfs2_dinode *fe;
1426 status = ocfs2_journal_access(handle, old_dir,
1427 old_dir_bh,
1428 OCFS2_JOURNAL_ACCESS_WRITE);
1429 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1430 fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1431 status = ocfs2_journal_dirty(handle, old_dir_bh);
1432 }
1433 }
1434
1435 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1436 status = 0;
1437 bail:
1438 if (rename_lock)
1439 ocfs2_rename_unlock(osb);
1440
1441 if (handle)
1442 ocfs2_commit_trans(osb, handle);
1443
1444 if (parents_locked)
1445 ocfs2_double_unlock(old_dir, new_dir);
1446
1447 if (old_child_locked)
1448 ocfs2_meta_unlock(old_inode, 1);
1449
1450 if (new_child_locked)
1451 ocfs2_meta_unlock(new_inode, 1);
1452
1453 if (orphan_dir) {
1454 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1455 ocfs2_meta_unlock(orphan_dir, 1);
1456 mutex_unlock(&orphan_dir->i_mutex);
1457 iput(orphan_dir);
1458 }
1459
1460 if (new_inode)
1461 sync_mapping_buffers(old_inode->i_mapping);
1462
1463 if (new_inode)
1464 iput(new_inode);
1465 if (newfe_bh)
1466 brelse(newfe_bh);
1467 if (old_inode_bh)
1468 brelse(old_inode_bh);
1469 if (old_dir_bh)
1470 brelse(old_dir_bh);
1471 if (new_dir_bh)
1472 brelse(new_dir_bh);
1473 if (new_de_bh)
1474 brelse(new_de_bh);
1475 if (old_de_bh)
1476 brelse(old_de_bh);
1477 if (old_inode_de_bh)
1478 brelse(old_inode_de_bh);
1479 if (orphan_entry_bh)
1480 brelse(orphan_entry_bh);
1481 if (insert_entry_bh)
1482 brelse(insert_entry_bh);
1483
1484 mlog_exit(status);
1485
1486 return status;
1487 }
1488
1489 /*
1490 * we expect i_size = strlen(symname). Copy symname into the file
1491 * data, including the null terminator.
1492 */
1493 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1494 handle_t *handle,
1495 struct inode *inode,
1496 const char *symname)
1497 {
1498 struct buffer_head **bhs = NULL;
1499 const char *c;
1500 struct super_block *sb = osb->sb;
1501 u64 p_blkno, p_blocks;
1502 int virtual, blocks, status, i, bytes_left;
1503
1504 bytes_left = i_size_read(inode) + 1;
1505 /* we can't trust i_blocks because we're actually going to
1506 * write i_size + 1 bytes. */
1507 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1508
1509 mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1510 (unsigned long long)inode->i_blocks,
1511 i_size_read(inode), blocks);
1512
1513 /* Sanity check -- make sure we're going to fit. */
1514 if (bytes_left >
1515 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1516 status = -EIO;
1517 mlog_errno(status);
1518 goto bail;
1519 }
1520
1521 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1522 if (!bhs) {
1523 status = -ENOMEM;
1524 mlog_errno(status);
1525 goto bail;
1526 }
1527
1528 status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1529 NULL);
1530 if (status < 0) {
1531 mlog_errno(status);
1532 goto bail;
1533 }
1534
1535 /* links can never be larger than one cluster so we know this
1536 * is all going to be contiguous, but do a sanity check
1537 * anyway. */
1538 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1539 status = -EIO;
1540 mlog_errno(status);
1541 goto bail;
1542 }
1543
1544 virtual = 0;
1545 while(bytes_left > 0) {
1546 c = &symname[virtual * sb->s_blocksize];
1547
1548 bhs[virtual] = sb_getblk(sb, p_blkno);
1549 if (!bhs[virtual]) {
1550 status = -ENOMEM;
1551 mlog_errno(status);
1552 goto bail;
1553 }
1554 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1555
1556 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1557 OCFS2_JOURNAL_ACCESS_CREATE);
1558 if (status < 0) {
1559 mlog_errno(status);
1560 goto bail;
1561 }
1562
1563 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1564
1565 memcpy(bhs[virtual]->b_data, c,
1566 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1567 bytes_left);
1568
1569 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1570 if (status < 0) {
1571 mlog_errno(status);
1572 goto bail;
1573 }
1574
1575 virtual++;
1576 p_blkno++;
1577 bytes_left -= sb->s_blocksize;
1578 }
1579
1580 status = 0;
1581 bail:
1582
1583 if (bhs) {
1584 for(i = 0; i < blocks; i++)
1585 if (bhs[i])
1586 brelse(bhs[i]);
1587 kfree(bhs);
1588 }
1589
1590 mlog_exit(status);
1591 return status;
1592 }
1593
1594 static int ocfs2_symlink(struct inode *dir,
1595 struct dentry *dentry,
1596 const char *symname)
1597 {
1598 int status, l, credits;
1599 u64 newsize;
1600 struct ocfs2_super *osb = NULL;
1601 struct inode *inode = NULL;
1602 struct super_block *sb;
1603 struct buffer_head *new_fe_bh = NULL;
1604 struct buffer_head *de_bh = NULL;
1605 struct buffer_head *parent_fe_bh = NULL;
1606 struct ocfs2_dinode *fe = NULL;
1607 struct ocfs2_dinode *dirfe;
1608 handle_t *handle = NULL;
1609 struct ocfs2_alloc_context *inode_ac = NULL;
1610 struct ocfs2_alloc_context *data_ac = NULL;
1611
1612 mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1613 dentry, symname, dentry->d_name.len, dentry->d_name.name);
1614
1615 sb = dir->i_sb;
1616 osb = OCFS2_SB(sb);
1617
1618 l = strlen(symname) + 1;
1619
1620 credits = ocfs2_calc_symlink_credits(sb);
1621
1622 /* lock the parent directory */
1623 status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
1624 if (status < 0) {
1625 if (status != -ENOENT)
1626 mlog_errno(status);
1627 return status;
1628 }
1629
1630 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1631 if (!dirfe->i_links_count) {
1632 /* can't make a file in a deleted directory. */
1633 status = -ENOENT;
1634 goto bail;
1635 }
1636
1637 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1638 dentry->d_name.len);
1639 if (status)
1640 goto bail;
1641
1642 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1643 dentry->d_name.name,
1644 dentry->d_name.len, &de_bh);
1645 if (status < 0) {
1646 mlog_errno(status);
1647 goto bail;
1648 }
1649
1650 status = ocfs2_reserve_new_inode(osb, &inode_ac);
1651 if (status < 0) {
1652 if (status != -ENOSPC)
1653 mlog_errno(status);
1654 goto bail;
1655 }
1656
1657 /* don't reserve bitmap space for fast symlinks. */
1658 if (l > ocfs2_fast_symlink_chars(sb)) {
1659 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
1660 if (status < 0) {
1661 if (status != -ENOSPC)
1662 mlog_errno(status);
1663 goto bail;
1664 }
1665 }
1666
1667 handle = ocfs2_start_trans(osb, credits);
1668 if (IS_ERR(handle)) {
1669 status = PTR_ERR(handle);
1670 handle = NULL;
1671 mlog_errno(status);
1672 goto bail;
1673 }
1674
1675 status = ocfs2_mknod_locked(osb, dir, dentry,
1676 S_IFLNK | S_IRWXUGO, 0,
1677 &new_fe_bh, parent_fe_bh, handle,
1678 &inode, inode_ac);
1679 if (status < 0) {
1680 mlog_errno(status);
1681 goto bail;
1682 }
1683
1684 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1685 inode->i_rdev = 0;
1686 newsize = l - 1;
1687 if (l > ocfs2_fast_symlink_chars(sb)) {
1688 u32 offset = 0;
1689
1690 inode->i_op = &ocfs2_symlink_inode_operations;
1691 status = ocfs2_do_extend_allocation(osb, inode, &offset, 1, 0,
1692 new_fe_bh,
1693 handle, data_ac, NULL,
1694 NULL);
1695 if (status < 0) {
1696 if (status != -ENOSPC && status != -EINTR) {
1697 mlog(ML_ERROR,
1698 "Failed to extend file to %llu\n",
1699 (unsigned long long)newsize);
1700 mlog_errno(status);
1701 status = -ENOSPC;
1702 }
1703 goto bail;
1704 }
1705 i_size_write(inode, newsize);
1706 inode->i_blocks = ocfs2_inode_sector_count(inode);
1707 } else {
1708 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1709 memcpy((char *) fe->id2.i_symlink, symname, l);
1710 i_size_write(inode, newsize);
1711 inode->i_blocks = 0;
1712 }
1713
1714 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1715 if (status < 0) {
1716 mlog_errno(status);
1717 goto bail;
1718 }
1719
1720 if (!ocfs2_inode_is_fast_symlink(inode)) {
1721 status = ocfs2_create_symlink_data(osb, handle, inode,
1722 symname);
1723 if (status < 0) {
1724 mlog_errno(status);
1725 goto bail;
1726 }
1727 }
1728
1729 status = ocfs2_add_entry(handle, dentry, inode,
1730 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1731 de_bh);
1732 if (status < 0) {
1733 mlog_errno(status);
1734 goto bail;
1735 }
1736
1737 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1738 if (status) {
1739 mlog_errno(status);
1740 goto bail;
1741 }
1742
1743 insert_inode_hash(inode);
1744 dentry->d_op = &ocfs2_dentry_ops;
1745 d_instantiate(dentry, inode);
1746 bail:
1747 if (handle)
1748 ocfs2_commit_trans(osb, handle);
1749
1750 ocfs2_meta_unlock(dir, 1);
1751
1752 if (new_fe_bh)
1753 brelse(new_fe_bh);
1754 if (parent_fe_bh)
1755 brelse(parent_fe_bh);
1756 if (de_bh)
1757 brelse(de_bh);
1758 if (inode_ac)
1759 ocfs2_free_alloc_context(inode_ac);
1760 if (data_ac)
1761 ocfs2_free_alloc_context(data_ac);
1762 if ((status < 0) && inode)
1763 iput(inode);
1764
1765 mlog_exit(status);
1766
1767 return status;
1768 }
1769
1770 int ocfs2_check_dir_entry(struct inode * dir,
1771 struct ocfs2_dir_entry * de,
1772 struct buffer_head * bh,
1773 unsigned long offset)
1774 {
1775 const char *error_msg = NULL;
1776 const int rlen = le16_to_cpu(de->rec_len);
1777
1778 if (rlen < OCFS2_DIR_REC_LEN(1))
1779 error_msg = "rec_len is smaller than minimal";
1780 else if (rlen % 4 != 0)
1781 error_msg = "rec_len % 4 != 0";
1782 else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
1783 error_msg = "rec_len is too small for name_len";
1784 else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
1785 error_msg = "directory entry across blocks";
1786
1787 if (error_msg != NULL)
1788 mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
1789 "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
1790 (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
1791 offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
1792 de->name_len);
1793 return error_msg == NULL ? 1 : 0;
1794 }
1795
1796 /* we don't always have a dentry for what we want to add, so people
1797 * like orphan dir can call this instead.
1798 *
1799 * If you pass me insert_bh, I'll skip the search of the other dir
1800 * blocks and put the record in there.
1801 */
1802 static int __ocfs2_add_entry(handle_t *handle,
1803 struct inode *dir,
1804 const char *name, int namelen,
1805 struct inode *inode, u64 blkno,
1806 struct buffer_head *parent_fe_bh,
1807 struct buffer_head *insert_bh)
1808 {
1809 unsigned long offset;
1810 unsigned short rec_len;
1811 struct ocfs2_dir_entry *de, *de1;
1812 struct super_block *sb;
1813 int retval, status;
1814
1815 mlog_entry_void();
1816
1817 sb = dir->i_sb;
1818
1819 if (!namelen)
1820 return -EINVAL;
1821
1822 rec_len = OCFS2_DIR_REC_LEN(namelen);
1823 offset = 0;
1824 de = (struct ocfs2_dir_entry *) insert_bh->b_data;
1825 while (1) {
1826 BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data);
1827 /* These checks should've already been passed by the
1828 * prepare function, but I guess we can leave them
1829 * here anyway. */
1830 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
1831 retval = -ENOENT;
1832 goto bail;
1833 }
1834 if (ocfs2_match(namelen, name, de)) {
1835 retval = -EEXIST;
1836 goto bail;
1837 }
1838 if (((le64_to_cpu(de->inode) == 0) &&
1839 (le16_to_cpu(de->rec_len) >= rec_len)) ||
1840 (le16_to_cpu(de->rec_len) >=
1841 (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
1842 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
1843 retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
1844 if (retval < 0) {
1845 mlog_errno(retval);
1846 goto bail;
1847 }
1848
1849 status = ocfs2_journal_access(handle, dir, insert_bh,
1850 OCFS2_JOURNAL_ACCESS_WRITE);
1851 /* By now the buffer is marked for journaling */
1852 offset += le16_to_cpu(de->rec_len);
1853 if (le64_to_cpu(de->inode)) {
1854 de1 = (struct ocfs2_dir_entry *)((char *) de +
1855 OCFS2_DIR_REC_LEN(de->name_len));
1856 de1->rec_len =
1857 cpu_to_le16(le16_to_cpu(de->rec_len) -
1858 OCFS2_DIR_REC_LEN(de->name_len));
1859 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
1860 de = de1;
1861 }
1862 de->file_type = OCFS2_FT_UNKNOWN;
1863 if (blkno) {
1864 de->inode = cpu_to_le64(blkno);
1865 ocfs2_set_de_type(de, inode->i_mode);
1866 } else
1867 de->inode = 0;
1868 de->name_len = namelen;
1869 memcpy(de->name, name, namelen);
1870
1871 dir->i_version++;
1872 status = ocfs2_journal_dirty(handle, insert_bh);
1873 retval = 0;
1874 goto bail;
1875 }
1876 offset += le16_to_cpu(de->rec_len);
1877 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
1878 }
1879
1880 /* when you think about it, the assert above should prevent us
1881 * from ever getting here. */
1882 retval = -ENOSPC;
1883 bail:
1884
1885 mlog_exit(retval);
1886 return retval;
1887 }
1888
1889
1890 /*
1891 * ocfs2_delete_entry deletes a directory entry by merging it with the
1892 * previous entry
1893 */
1894 static int ocfs2_delete_entry(handle_t *handle,
1895 struct inode *dir,
1896 struct ocfs2_dir_entry *de_del,
1897 struct buffer_head *bh)
1898 {
1899 struct ocfs2_dir_entry *de, *pde;
1900 int i, status = -ENOENT;
1901
1902 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
1903
1904 i = 0;
1905 pde = NULL;
1906 de = (struct ocfs2_dir_entry *) bh->b_data;
1907 while (i < bh->b_size) {
1908 if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
1909 status = -EIO;
1910 mlog_errno(status);
1911 goto bail;
1912 }
1913 if (de == de_del) {
1914 status = ocfs2_journal_access(handle, dir, bh,
1915 OCFS2_JOURNAL_ACCESS_WRITE);
1916 if (status < 0) {
1917 status = -EIO;
1918 mlog_errno(status);
1919 goto bail;
1920 }
1921 if (pde)
1922 pde->rec_len =
1923 cpu_to_le16(le16_to_cpu(pde->rec_len) +
1924 le16_to_cpu(de->rec_len));
1925 else
1926 de->inode = 0;
1927 dir->i_version++;
1928 status = ocfs2_journal_dirty(handle, bh);
1929 goto bail;
1930 }
1931 i += le16_to_cpu(de->rec_len);
1932 pde = de;
1933 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
1934 }
1935 bail:
1936 mlog_exit(status);
1937 return status;
1938 }
1939
1940 /*
1941 * Returns 0 if not found, -1 on failure, and 1 on success
1942 */
1943 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
1944 struct inode *dir,
1945 const char *name, int namelen,
1946 unsigned long offset,
1947 struct ocfs2_dir_entry **res_dir)
1948 {
1949 struct ocfs2_dir_entry *de;
1950 char *dlimit, *de_buf;
1951 int de_len;
1952 int ret = 0;
1953
1954 mlog_entry_void();
1955
1956 de_buf = bh->b_data;
1957 dlimit = de_buf + dir->i_sb->s_blocksize;
1958
1959 while (de_buf < dlimit) {
1960 /* this code is executed quadratically often */
1961 /* do minimal checking `by hand' */
1962
1963 de = (struct ocfs2_dir_entry *) de_buf;
1964
1965 if (de_buf + namelen <= dlimit &&
1966 ocfs2_match(namelen, name, de)) {
1967 /* found a match - just to be sure, do a full check */
1968 if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
1969 ret = -1;
1970 goto bail;
1971 }
1972 *res_dir = de;
1973 ret = 1;
1974 goto bail;
1975 }
1976
1977 /* prevent looping on a bad block */
1978 de_len = le16_to_cpu(de->rec_len);
1979 if (de_len <= 0) {
1980 ret = -1;
1981 goto bail;
1982 }
1983
1984 de_buf += de_len;
1985 offset += de_len;
1986 }
1987
1988 bail:
1989 mlog_exit(ret);
1990 return ret;
1991 }
1992
1993 struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
1994 struct inode *dir,
1995 struct ocfs2_dir_entry **res_dir)
1996 {
1997 struct super_block *sb;
1998 struct buffer_head *bh_use[NAMEI_RA_SIZE];
1999 struct buffer_head *bh, *ret = NULL;
2000 unsigned long start, block, b;
2001 int ra_max = 0; /* Number of bh's in the readahead
2002 buffer, bh_use[] */
2003 int ra_ptr = 0; /* Current index into readahead
2004 buffer */
2005 int num = 0;
2006 int nblocks, i, err;
2007
2008 mlog_entry_void();
2009
2010 *res_dir = NULL;
2011 sb = dir->i_sb;
2012
2013 nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2014 start = OCFS2_I(dir)->ip_dir_start_lookup;
2015 if (start >= nblocks)
2016 start = 0;
2017 block = start;
2018
2019 restart:
2020 do {
2021 /*
2022 * We deal with the read-ahead logic here.
2023 */
2024 if (ra_ptr >= ra_max) {
2025 /* Refill the readahead buffer */
2026 ra_ptr = 0;
2027 b = block;
2028 for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
2029 /*
2030 * Terminate if we reach the end of the
2031 * directory and must wrap, or if our
2032 * search has finished at this block.
2033 */
2034 if (b >= nblocks || (num && block == start)) {
2035 bh_use[ra_max] = NULL;
2036 break;
2037 }
2038 num++;
2039
2040 bh = ocfs2_bread(dir, b++, &err, 1);
2041 bh_use[ra_max] = bh;
2042 }
2043 }
2044 if ((bh = bh_use[ra_ptr++]) == NULL)
2045 goto next;
2046 wait_on_buffer(bh);
2047 if (!buffer_uptodate(bh)) {
2048 /* read error, skip block & hope for the best */
2049 ocfs2_error(dir->i_sb, "reading directory %llu, "
2050 "offset %lu\n",
2051 (unsigned long long)OCFS2_I(dir)->ip_blkno,
2052 block);
2053 brelse(bh);
2054 goto next;
2055 }
2056 i = ocfs2_search_dirblock(bh, dir, name, namelen,
2057 block << sb->s_blocksize_bits,
2058 res_dir);
2059 if (i == 1) {
2060 OCFS2_I(dir)->ip_dir_start_lookup = block;
2061 ret = bh;
2062 goto cleanup_and_exit;
2063 } else {
2064 brelse(bh);
2065 if (i < 0)
2066 goto cleanup_and_exit;
2067 }
2068 next:
2069 if (++block >= nblocks)
2070 block = 0;
2071 } while (block != start);
2072
2073 /*
2074 * If the directory has grown while we were searching, then
2075 * search the last part of the directory before giving up.
2076 */
2077 block = nblocks;
2078 nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2079 if (block < nblocks) {
2080 start = 0;
2081 goto restart;
2082 }
2083
2084 cleanup_and_exit:
2085 /* Clean up the read-ahead blocks */
2086 for (; ra_ptr < ra_max; ra_ptr++)
2087 brelse(bh_use[ra_ptr]);
2088
2089 mlog_exit_ptr(ret);
2090 return ret;
2091 }
2092
2093 static int ocfs2_blkno_stringify(u64 blkno, char *name)
2094 {
2095 int status, namelen;
2096
2097 mlog_entry_void();
2098
2099 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
2100 (long long)blkno);
2101 if (namelen <= 0) {
2102 if (namelen)
2103 status = namelen;
2104 else
2105 status = -EINVAL;
2106 mlog_errno(status);
2107 goto bail;
2108 }
2109 if (namelen != OCFS2_ORPHAN_NAMELEN) {
2110 status = -EINVAL;
2111 mlog_errno(status);
2112 goto bail;
2113 }
2114
2115 mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
2116 namelen);
2117
2118 status = 0;
2119 bail:
2120 mlog_exit(status);
2121 return status;
2122 }
2123
2124 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2125 struct inode **ret_orphan_dir,
2126 struct inode *inode,
2127 char *name,
2128 struct buffer_head **de_bh)
2129 {
2130 struct inode *orphan_dir_inode;
2131 struct buffer_head *orphan_dir_bh = NULL;
2132 int status = 0;
2133
2134 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2135 if (status < 0) {
2136 mlog_errno(status);
2137 return status;
2138 }
2139
2140 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2141 ORPHAN_DIR_SYSTEM_INODE,
2142 osb->slot_num);
2143 if (!orphan_dir_inode) {
2144 status = -ENOENT;
2145 mlog_errno(status);
2146 return status;
2147 }
2148
2149 mutex_lock(&orphan_dir_inode->i_mutex);
2150
2151 status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2152 if (status < 0) {
2153 mlog_errno(status);
2154 goto leave;
2155 }
2156
2157 status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2158 orphan_dir_bh, name,
2159 OCFS2_ORPHAN_NAMELEN, de_bh);
2160 if (status < 0) {
2161 ocfs2_meta_unlock(orphan_dir_inode, 1);
2162
2163 mlog_errno(status);
2164 goto leave;
2165 }
2166
2167 *ret_orphan_dir = orphan_dir_inode;
2168
2169 leave:
2170 if (status) {
2171 mutex_unlock(&orphan_dir_inode->i_mutex);
2172 iput(orphan_dir_inode);
2173 }
2174
2175 if (orphan_dir_bh)
2176 brelse(orphan_dir_bh);
2177
2178 mlog_exit(status);
2179 return status;
2180 }
2181
2182 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2183 handle_t *handle,
2184 struct inode *inode,
2185 struct ocfs2_dinode *fe,
2186 char *name,
2187 struct buffer_head *de_bh,
2188 struct inode *orphan_dir_inode)
2189 {
2190 struct buffer_head *orphan_dir_bh = NULL;
2191 int status = 0;
2192 struct ocfs2_dinode *orphan_fe;
2193
2194 mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
2195
2196 status = ocfs2_read_block(osb,
2197 OCFS2_I(orphan_dir_inode)->ip_blkno,
2198 &orphan_dir_bh, OCFS2_BH_CACHED,
2199 orphan_dir_inode);
2200 if (status < 0) {
2201 mlog_errno(status);
2202 goto leave;
2203 }
2204
2205 status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
2206 OCFS2_JOURNAL_ACCESS_WRITE);
2207 if (status < 0) {
2208 mlog_errno(status);
2209 goto leave;
2210 }
2211
2212 /* we're a cluster, and nlink can change on disk from
2213 * underneath us... */
2214 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2215 if (S_ISDIR(inode->i_mode))
2216 le16_add_cpu(&orphan_fe->i_links_count, 1);
2217 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2218
2219 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2220 if (status < 0) {
2221 mlog_errno(status);
2222 goto leave;
2223 }
2224
2225 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2226 OCFS2_ORPHAN_NAMELEN, inode,
2227 OCFS2_I(inode)->ip_blkno,
2228 orphan_dir_bh, de_bh);
2229 if (status < 0) {
2230 mlog_errno(status);
2231 goto leave;
2232 }
2233
2234 le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2235
2236 /* Record which orphan dir our inode now resides
2237 * in. delete_inode will use this to determine which orphan
2238 * dir to lock. */
2239 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
2240
2241 mlog(0, "Inode %llu orphaned in slot %d\n",
2242 (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
2243
2244 leave:
2245 if (orphan_dir_bh)
2246 brelse(orphan_dir_bh);
2247
2248 mlog_exit(status);
2249 return status;
2250 }
2251
2252 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2253 int ocfs2_orphan_del(struct ocfs2_super *osb,
2254 handle_t *handle,
2255 struct inode *orphan_dir_inode,
2256 struct inode *inode,
2257 struct buffer_head *orphan_dir_bh)
2258 {
2259 char name[OCFS2_ORPHAN_NAMELEN + 1];
2260 struct ocfs2_dinode *orphan_fe;
2261 int status = 0;
2262 struct buffer_head *target_de_bh = NULL;
2263 struct ocfs2_dir_entry *target_de = NULL;
2264
2265 mlog_entry_void();
2266
2267 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2268 if (status < 0) {
2269 mlog_errno(status);
2270 goto leave;
2271 }
2272
2273 mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
2274 name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2275 OCFS2_ORPHAN_NAMELEN);
2276
2277 /* find it's spot in the orphan directory */
2278 target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
2279 orphan_dir_inode, &target_de);
2280 if (!target_de_bh) {
2281 status = -ENOENT;
2282 mlog_errno(status);
2283 goto leave;
2284 }
2285
2286 /* remove it from the orphan directory */
2287 status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
2288 target_de_bh);
2289 if (status < 0) {
2290 mlog_errno(status);
2291 goto leave;
2292 }
2293
2294 status = ocfs2_journal_access(handle,orphan_dir_inode, orphan_dir_bh,
2295 OCFS2_JOURNAL_ACCESS_WRITE);
2296 if (status < 0) {
2297 mlog_errno(status);
2298 goto leave;
2299 }
2300
2301 /* do the i_nlink dance! :) */
2302 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2303 if (S_ISDIR(inode->i_mode))
2304 le16_add_cpu(&orphan_fe->i_links_count, -1);
2305 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2306
2307 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2308 if (status < 0) {
2309 mlog_errno(status);
2310 goto leave;
2311 }
2312
2313 leave:
2314 if (target_de_bh)
2315 brelse(target_de_bh);
2316
2317 mlog_exit(status);
2318 return status;
2319 }
2320
2321 const struct inode_operations ocfs2_dir_iops = {
2322 .create = ocfs2_create,
2323 .lookup = ocfs2_lookup,
2324 .link = ocfs2_link,
2325 .unlink = ocfs2_unlink,
2326 .rmdir = ocfs2_unlink,
2327 .symlink = ocfs2_symlink,
2328 .mkdir = ocfs2_mkdir,
2329 .mknod = ocfs2_mknod,
2330 .rename = ocfs2_rename,
2331 .setattr = ocfs2_setattr,
2332 .getattr = ocfs2_getattr,
2333 .permission = ocfs2_permission,
2334 };
Linux kernel - Deliverables
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