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[PATCH] SPI/MTD: mtd_dataflash oops prevention
[linux-2.6/verdex.git] / fs / ocfs2 / namei.c
blob9637039c263355676716b72b98eaa9f147867dfb
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 mlog(ML_ERROR, "Unable to create inode %llu\n",
179 (unsigned long long)blkno);
180 ret = ERR_PTR(-EACCES);
181 goto bail_unlock;
182 }
183
184 oi = OCFS2_I(inode);
185 /* Clear any orphaned state... If we were able to look up the
186 * inode from a directory, it certainly can't be orphaned. We
187 * might have the bad state from a node which intended to
188 * orphan this inode but crashed before it could commit the
189 * unlink. */
190 spin_lock(&oi->ip_lock);
191 oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
192 oi->ip_orphaned_slot = OCFS2_INVALID_SLOT;
193 spin_unlock(&oi->ip_lock);
194
195 bail_add:
196 dentry->d_op = &ocfs2_dentry_ops;
197 ret = d_splice_alias(inode, dentry);
198
199 if (inode) {
200 /*
201 * If d_splice_alias() finds a DCACHE_DISCONNECTED
202 * dentry, it will d_move() it on top of ourse. The
203 * return value will indicate this however, so in
204 * those cases, we switch them around for the locking
205 * code.
206 *
207 * NOTE: This dentry already has ->d_op set from
208 * ocfs2_get_parent() and ocfs2_get_dentry()
209 */
210 if (ret)
211 dentry = ret;
212
213 status = ocfs2_dentry_attach_lock(dentry, inode,
214 OCFS2_I(dir)->ip_blkno);
215 if (status) {
216 mlog_errno(status);
217 ret = ERR_PTR(status);
218 goto bail_unlock;
219 }
220 }
221
222 bail_unlock:
223 /* Don't drop the cluster lock until *after* the d_add --
224 * unlink on another node will message us to remove that
225 * dentry under this lock so otherwise we can race this with
226 * the vote thread and have a stale dentry. */
227 ocfs2_meta_unlock(dir, 0);
228
229 bail:
230 if (dirent_bh)
231 brelse(dirent_bh);
232
233 mlog_exit_ptr(ret);
234
235 return ret;
236 }
237
238 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
239 handle_t *handle,
240 struct inode *parent,
241 struct inode *inode,
242 struct buffer_head *fe_bh,
243 struct ocfs2_alloc_context *data_ac)
244 {
245 int status;
246 struct buffer_head *new_bh = NULL;
247 struct ocfs2_dir_entry *de = NULL;
248
249 mlog_entry_void();
250
251 status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
252 data_ac, NULL, &new_bh);
253 if (status < 0) {
254 mlog_errno(status);
255 goto bail;
256 }
257
258 ocfs2_set_new_buffer_uptodate(inode, new_bh);
259
260 status = ocfs2_journal_access(handle, inode, new_bh,
261 OCFS2_JOURNAL_ACCESS_CREATE);
262 if (status < 0) {
263 mlog_errno(status);
264 goto bail;
265 }
266 memset(new_bh->b_data, 0, osb->sb->s_blocksize);
267
268 de = (struct ocfs2_dir_entry *) new_bh->b_data;
269 de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
270 de->name_len = 1;
271 de->rec_len =
272 cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
273 strcpy(de->name, ".");
274 ocfs2_set_de_type(de, S_IFDIR);
275 de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
276 de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
277 de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize -
278 OCFS2_DIR_REC_LEN(1));
279 de->name_len = 2;
280 strcpy(de->name, "..");
281 ocfs2_set_de_type(de, S_IFDIR);
282
283 status = ocfs2_journal_dirty(handle, new_bh);
284 if (status < 0) {
285 mlog_errno(status);
286 goto bail;
287 }
288
289 i_size_write(inode, inode->i_sb->s_blocksize);
290 inode->i_nlink = 2;
291 inode->i_blocks = ocfs2_align_bytes_to_sectors(inode->i_sb->s_blocksize);
292 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
293 if (status < 0) {
294 mlog_errno(status);
295 goto bail;
296 }
297
298 status = 0;
299 bail:
300 if (new_bh)
301 brelse(new_bh);
302
303 mlog_exit(status);
304 return status;
305 }
306
307 static int ocfs2_mknod(struct inode *dir,
308 struct dentry *dentry,
309 int mode,
310 dev_t dev)
311 {
312 int status = 0;
313 struct buffer_head *parent_fe_bh = NULL;
314 handle_t *handle = NULL;
315 struct ocfs2_super *osb;
316 struct ocfs2_dinode *dirfe;
317 struct buffer_head *new_fe_bh = NULL;
318 struct buffer_head *de_bh = NULL;
319 struct inode *inode = NULL;
320 struct ocfs2_alloc_context *inode_ac = NULL;
321 struct ocfs2_alloc_context *data_ac = NULL;
322
323 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
324 (unsigned long)dev, dentry->d_name.len,
325 dentry->d_name.name);
326
327 /* get our super block */
328 osb = OCFS2_SB(dir->i_sb);
329
330 status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
331 if (status < 0) {
332 if (status != -ENOENT)
333 mlog_errno(status);
334 return status;
335 }
336
337 if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
338 status = -EMLINK;
339 goto leave;
340 }
341
342 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
343 if (!dirfe->i_links_count) {
344 /* can't make a file in a deleted directory. */
345 status = -ENOENT;
346 goto leave;
347 }
348
349 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
350 dentry->d_name.len);
351 if (status)
352 goto leave;
353
354 /* get a spot inside the dir. */
355 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
356 dentry->d_name.name,
357 dentry->d_name.len, &de_bh);
358 if (status < 0) {
359 mlog_errno(status);
360 goto leave;
361 }
362
363 /* reserve an inode spot */
364 status = ocfs2_reserve_new_inode(osb, &inode_ac);
365 if (status < 0) {
366 if (status != -ENOSPC)
367 mlog_errno(status);
368 goto leave;
369 }
370
371 /* are we making a directory? If so, reserve a cluster for his
372 * 1st extent. */
373 if (S_ISDIR(mode)) {
374 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
375 if (status < 0) {
376 if (status != -ENOSPC)
377 mlog_errno(status);
378 goto leave;
379 }
380 }
381
382 handle = ocfs2_start_trans(osb, OCFS2_MKNOD_CREDITS);
383 if (IS_ERR(handle)) {
384 status = PTR_ERR(handle);
385 handle = NULL;
386 mlog_errno(status);
387 goto leave;
388 }
389
390 /* do the real work now. */
391 status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
392 &new_fe_bh, parent_fe_bh, handle,
393 &inode, inode_ac);
394 if (status < 0) {
395 mlog_errno(status);
396 goto leave;
397 }
398
399 if (S_ISDIR(mode)) {
400 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
401 new_fe_bh, data_ac);
402 if (status < 0) {
403 mlog_errno(status);
404 goto leave;
405 }
406
407 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
408 OCFS2_JOURNAL_ACCESS_WRITE);
409 if (status < 0) {
410 mlog_errno(status);
411 goto leave;
412 }
413 le16_add_cpu(&dirfe->i_links_count, 1);
414 status = ocfs2_journal_dirty(handle, parent_fe_bh);
415 if (status < 0) {
416 mlog_errno(status);
417 goto leave;
418 }
419 inc_nlink(dir);
420 }
421
422 status = ocfs2_add_entry(handle, dentry, inode,
423 OCFS2_I(inode)->ip_blkno, parent_fe_bh,
424 de_bh);
425 if (status < 0) {
426 mlog_errno(status);
427 goto leave;
428 }
429
430 status = ocfs2_dentry_attach_lock(dentry, inode,
431 OCFS2_I(dir)->ip_blkno);
432 if (status) {
433 mlog_errno(status);
434 goto leave;
435 }
436
437 insert_inode_hash(inode);
438 dentry->d_op = &ocfs2_dentry_ops;
439 d_instantiate(dentry, inode);
440 status = 0;
441 leave:
442 if (handle)
443 ocfs2_commit_trans(osb, handle);
444
445 ocfs2_meta_unlock(dir, 1);
446
447 if (status == -ENOSPC)
448 mlog(0, "Disk is full\n");
449
450 if (new_fe_bh)
451 brelse(new_fe_bh);
452
453 if (de_bh)
454 brelse(de_bh);
455
456 if (parent_fe_bh)
457 brelse(parent_fe_bh);
458
459 if ((status < 0) && inode)
460 iput(inode);
461
462 if (inode_ac)
463 ocfs2_free_alloc_context(inode_ac);
464
465 if (data_ac)
466 ocfs2_free_alloc_context(data_ac);
467
468 mlog_exit(status);
469
470 return status;
471 }
472
473 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
474 struct inode *dir,
475 struct dentry *dentry, int mode,
476 dev_t dev,
477 struct buffer_head **new_fe_bh,
478 struct buffer_head *parent_fe_bh,
479 handle_t *handle,
480 struct inode **ret_inode,
481 struct ocfs2_alloc_context *inode_ac)
482 {
483 int status = 0;
484 struct ocfs2_dinode *fe = NULL;
485 struct ocfs2_extent_list *fel;
486 u64 fe_blkno = 0;
487 u16 suballoc_bit;
488 struct inode *inode = NULL;
489
490 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
491 (unsigned long)dev, dentry->d_name.len,
492 dentry->d_name.name);
493
494 *new_fe_bh = NULL;
495 *ret_inode = NULL;
496
497 status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
498 &fe_blkno);
499 if (status < 0) {
500 mlog_errno(status);
501 goto leave;
502 }
503
504 inode = new_inode(dir->i_sb);
505 if (IS_ERR(inode)) {
506 status = PTR_ERR(inode);
507 mlog(ML_ERROR, "new_inode failed!\n");
508 goto leave;
509 }
510
511 /* populate as many fields early on as possible - many of
512 * these are used by the support functions here and in
513 * callers. */
514 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
515 OCFS2_I(inode)->ip_blkno = fe_blkno;
516 if (S_ISDIR(mode))
517 inode->i_nlink = 2;
518 else
519 inode->i_nlink = 1;
520 inode->i_mode = mode;
521 spin_lock(&osb->osb_lock);
522 inode->i_generation = osb->s_next_generation++;
523 spin_unlock(&osb->osb_lock);
524
525 *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
526 if (!*new_fe_bh) {
527 status = -EIO;
528 mlog_errno(status);
529 goto leave;
530 }
531 ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
532
533 status = ocfs2_journal_access(handle, inode, *new_fe_bh,
534 OCFS2_JOURNAL_ACCESS_CREATE);
535 if (status < 0) {
536 mlog_errno(status);
537 goto leave;
538 }
539
540 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
541 memset(fe, 0, osb->sb->s_blocksize);
542
543 fe->i_generation = cpu_to_le32(inode->i_generation);
544 fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
545 fe->i_blkno = cpu_to_le64(fe_blkno);
546 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
547 fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
548 fe->i_uid = cpu_to_le32(current->fsuid);
549 if (dir->i_mode & S_ISGID) {
550 fe->i_gid = cpu_to_le32(dir->i_gid);
551 if (S_ISDIR(mode))
552 mode |= S_ISGID;
553 } else
554 fe->i_gid = cpu_to_le32(current->fsgid);
555 fe->i_mode = cpu_to_le16(mode);
556 if (S_ISCHR(mode) || S_ISBLK(mode))
557 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
558
559 fe->i_links_count = cpu_to_le16(inode->i_nlink);
560
561 fe->i_last_eb_blk = 0;
562 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
563 le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
564 fe->i_atime = fe->i_ctime = fe->i_mtime =
565 cpu_to_le64(CURRENT_TIME.tv_sec);
566 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
567 cpu_to_le32(CURRENT_TIME.tv_nsec);
568 fe->i_dtime = 0;
569
570 fel = &fe->id2.i_list;
571 fel->l_tree_depth = 0;
572 fel->l_next_free_rec = 0;
573 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
574
575 status = ocfs2_journal_dirty(handle, *new_fe_bh);
576 if (status < 0) {
577 mlog_errno(status);
578 goto leave;
579 }
580
581 if (ocfs2_populate_inode(inode, fe, 1) < 0) {
582 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
583 "i_blkno=%llu, i_ino=%lu\n",
584 (unsigned long long) (*new_fe_bh)->b_blocknr,
585 (unsigned long long)fe->i_blkno, inode->i_ino);
586 BUG();
587 }
588
589 ocfs2_inode_set_new(osb, inode);
590 if (!ocfs2_mount_local(osb)) {
591 status = ocfs2_create_new_inode_locks(inode);
592 if (status < 0)
593 mlog_errno(status);
594 }
595
596 status = 0; /* error in ocfs2_create_new_inode_locks is not
597 * critical */
598
599 *ret_inode = inode;
600 leave:
601 if (status < 0) {
602 if (*new_fe_bh) {
603 brelse(*new_fe_bh);
604 *new_fe_bh = NULL;
605 }
606 if (inode)
607 iput(inode);
608 }
609
610 mlog_exit(status);
611 return status;
612 }
613
614 static int ocfs2_mkdir(struct inode *dir,
615 struct dentry *dentry,
616 int mode)
617 {
618 int ret;
619
620 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
621 dentry->d_name.len, dentry->d_name.name);
622 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
623 mlog_exit(ret);
624
625 return ret;
626 }
627
628 static int ocfs2_create(struct inode *dir,
629 struct dentry *dentry,
630 int mode,
631 struct nameidata *nd)
632 {
633 int ret;
634
635 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
636 dentry->d_name.len, dentry->d_name.name);
637 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
638 mlog_exit(ret);
639
640 return ret;
641 }
642
643 static int ocfs2_link(struct dentry *old_dentry,
644 struct inode *dir,
645 struct dentry *dentry)
646 {
647 handle_t *handle;
648 struct inode *inode = old_dentry->d_inode;
649 int err;
650 struct buffer_head *fe_bh = NULL;
651 struct buffer_head *parent_fe_bh = NULL;
652 struct buffer_head *de_bh = NULL;
653 struct ocfs2_dinode *fe = NULL;
654 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
655
656 mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
657 old_dentry->d_name.len, old_dentry->d_name.name,
658 dentry->d_name.len, dentry->d_name.name);
659
660 if (S_ISDIR(inode->i_mode))
661 return -EPERM;
662
663 err = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
664 if (err < 0) {
665 if (err != -ENOENT)
666 mlog_errno(err);
667 return err;
668 }
669
670 if (!dir->i_nlink) {
671 err = -ENOENT;
672 goto out;
673 }
674
675 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
676 dentry->d_name.len);
677 if (err)
678 goto out;
679
680 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
681 dentry->d_name.name,
682 dentry->d_name.len, &de_bh);
683 if (err < 0) {
684 mlog_errno(err);
685 goto out;
686 }
687
688 err = ocfs2_meta_lock(inode, &fe_bh, 1);
689 if (err < 0) {
690 if (err != -ENOENT)
691 mlog_errno(err);
692 goto out;
693 }
694
695 fe = (struct ocfs2_dinode *) fe_bh->b_data;
696 if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
697 err = -EMLINK;
698 goto out_unlock_inode;
699 }
700
701 handle = ocfs2_start_trans(osb, OCFS2_LINK_CREDITS);
702 if (IS_ERR(handle)) {
703 err = PTR_ERR(handle);
704 handle = NULL;
705 mlog_errno(err);
706 goto out_unlock_inode;
707 }
708
709 err = ocfs2_journal_access(handle, inode, fe_bh,
710 OCFS2_JOURNAL_ACCESS_WRITE);
711 if (err < 0) {
712 mlog_errno(err);
713 goto out_commit;
714 }
715
716 inc_nlink(inode);
717 inode->i_ctime = CURRENT_TIME;
718 fe->i_links_count = cpu_to_le16(inode->i_nlink);
719 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
720 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
721
722 err = ocfs2_journal_dirty(handle, fe_bh);
723 if (err < 0) {
724 le16_add_cpu(&fe->i_links_count, -1);
725 drop_nlink(inode);
726 mlog_errno(err);
727 goto out_commit;
728 }
729
730 err = ocfs2_add_entry(handle, dentry, inode,
731 OCFS2_I(inode)->ip_blkno,
732 parent_fe_bh, de_bh);
733 if (err) {
734 le16_add_cpu(&fe->i_links_count, -1);
735 drop_nlink(inode);
736 mlog_errno(err);
737 goto out_commit;
738 }
739
740 err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
741 if (err) {
742 mlog_errno(err);
743 goto out_commit;
744 }
745
746 atomic_inc(&inode->i_count);
747 dentry->d_op = &ocfs2_dentry_ops;
748 d_instantiate(dentry, inode);
749
750 out_commit:
751 ocfs2_commit_trans(osb, handle);
752 out_unlock_inode:
753 ocfs2_meta_unlock(inode, 1);
754
755 out:
756 ocfs2_meta_unlock(dir, 1);
757
758 if (de_bh)
759 brelse(de_bh);
760 if (fe_bh)
761 brelse(fe_bh);
762 if (parent_fe_bh)
763 brelse(parent_fe_bh);
764
765 mlog_exit(err);
766
767 return err;
768 }
769
770 /*
771 * Takes and drops an exclusive lock on the given dentry. This will
772 * force other nodes to drop it.
773 */
774 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
775 {
776 int ret;
777
778 ret = ocfs2_dentry_lock(dentry, 1);
779 if (ret)
780 mlog_errno(ret);
781 else
782 ocfs2_dentry_unlock(dentry, 1);
783
784 return ret;
785 }
786
787 static inline int inode_is_unlinkable(struct inode *inode)
788 {
789 if (S_ISDIR(inode->i_mode)) {
790 if (inode->i_nlink == 2)
791 return 1;
792 return 0;
793 }
794
795 if (inode->i_nlink == 1)
796 return 1;
797 return 0;
798 }
799
800 static int ocfs2_unlink(struct inode *dir,
801 struct dentry *dentry)
802 {
803 int status;
804 int child_locked = 0;
805 struct inode *inode = dentry->d_inode;
806 struct inode *orphan_dir = NULL;
807 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
808 u64 blkno;
809 struct ocfs2_dinode *fe = NULL;
810 struct buffer_head *fe_bh = NULL;
811 struct buffer_head *parent_node_bh = NULL;
812 handle_t *handle = NULL;
813 struct ocfs2_dir_entry *dirent = NULL;
814 struct buffer_head *dirent_bh = NULL;
815 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
816 struct buffer_head *orphan_entry_bh = NULL;
817
818 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
819 dentry->d_name.len, dentry->d_name.name);
820
821 BUG_ON(dentry->d_parent->d_inode != dir);
822
823 mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
824
825 if (inode == osb->root_inode) {
826 mlog(0, "Cannot delete the root directory\n");
827 return -EPERM;
828 }
829
830 status = ocfs2_meta_lock(dir, &parent_node_bh, 1);
831 if (status < 0) {
832 if (status != -ENOENT)
833 mlog_errno(status);
834 return status;
835 }
836
837 status = ocfs2_find_files_on_disk(dentry->d_name.name,
838 dentry->d_name.len, &blkno,
839 dir, &dirent_bh, &dirent);
840 if (status < 0) {
841 if (status != -ENOENT)
842 mlog_errno(status);
843 goto leave;
844 }
845
846 if (OCFS2_I(inode)->ip_blkno != blkno) {
847 status = -ENOENT;
848
849 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
850 (unsigned long long)OCFS2_I(inode)->ip_blkno,
851 (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
852 goto leave;
853 }
854
855 status = ocfs2_meta_lock(inode, &fe_bh, 1);
856 if (status < 0) {
857 if (status != -ENOENT)
858 mlog_errno(status);
859 goto leave;
860 }
861 child_locked = 1;
862
863 if (S_ISDIR(inode->i_mode)) {
864 if (!ocfs2_empty_dir(inode)) {
865 status = -ENOTEMPTY;
866 goto leave;
867 } else if (inode->i_nlink != 2) {
868 status = -ENOTEMPTY;
869 goto leave;
870 }
871 }
872
873 status = ocfs2_remote_dentry_delete(dentry);
874 if (status < 0) {
875 /* This vote should succeed under all normal
876 * circumstances. */
877 mlog_errno(status);
878 goto leave;
879 }
880
881 if (inode_is_unlinkable(inode)) {
882 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
883 orphan_name,
884 &orphan_entry_bh);
885 if (status < 0) {
886 mlog_errno(status);
887 goto leave;
888 }
889 }
890
891 handle = ocfs2_start_trans(osb, OCFS2_UNLINK_CREDITS);
892 if (IS_ERR(handle)) {
893 status = PTR_ERR(handle);
894 handle = NULL;
895 mlog_errno(status);
896 goto leave;
897 }
898
899 status = ocfs2_journal_access(handle, inode, fe_bh,
900 OCFS2_JOURNAL_ACCESS_WRITE);
901 if (status < 0) {
902 mlog_errno(status);
903 goto leave;
904 }
905
906 fe = (struct ocfs2_dinode *) fe_bh->b_data;
907
908 if (inode_is_unlinkable(inode)) {
909 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
910 orphan_entry_bh, orphan_dir);
911 if (status < 0) {
912 mlog_errno(status);
913 goto leave;
914 }
915 }
916
917 /* delete the name from the parent dir */
918 status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
919 if (status < 0) {
920 mlog_errno(status);
921 goto leave;
922 }
923
924 if (S_ISDIR(inode->i_mode))
925 drop_nlink(inode);
926 drop_nlink(inode);
927 fe->i_links_count = cpu_to_le16(inode->i_nlink);
928
929 status = ocfs2_journal_dirty(handle, fe_bh);
930 if (status < 0) {
931 mlog_errno(status);
932 goto leave;
933 }
934
935 if (S_ISDIR(inode->i_mode)) {
936 drop_nlink(dir);
937 status = ocfs2_mark_inode_dirty(handle, dir,
938 parent_node_bh);
939 if (status < 0) {
940 mlog_errno(status);
941 inc_nlink(dir);
942 }
943 }
944
945 leave:
946 if (handle)
947 ocfs2_commit_trans(osb, handle);
948
949 if (child_locked)
950 ocfs2_meta_unlock(inode, 1);
951
952 ocfs2_meta_unlock(dir, 1);
953
954 if (orphan_dir) {
955 /* This was locked for us in ocfs2_prepare_orphan_dir() */
956 ocfs2_meta_unlock(orphan_dir, 1);
957 mutex_unlock(&orphan_dir->i_mutex);
958 iput(orphan_dir);
959 }
960
961 if (fe_bh)
962 brelse(fe_bh);
963
964 if (dirent_bh)
965 brelse(dirent_bh);
966
967 if (parent_node_bh)
968 brelse(parent_node_bh);
969
970 if (orphan_entry_bh)
971 brelse(orphan_entry_bh);
972
973 mlog_exit(status);
974
975 return status;
976 }
977
978 /*
979 * The only place this should be used is rename!
980 * if they have the same id, then the 1st one is the only one locked.
981 */
982 static int ocfs2_double_lock(struct ocfs2_super *osb,
983 struct buffer_head **bh1,
984 struct inode *inode1,
985 struct buffer_head **bh2,
986 struct inode *inode2)
987 {
988 int status;
989 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
990 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
991 struct buffer_head **tmpbh;
992 struct inode *tmpinode;
993
994 mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
995 (unsigned long long)oi1->ip_blkno,
996 (unsigned long long)oi2->ip_blkno);
997
998 if (*bh1)
999 *bh1 = NULL;
1000 if (*bh2)
1001 *bh2 = NULL;
1002
1003 /* we always want to lock the one with the lower lockid first. */
1004 if (oi1->ip_blkno != oi2->ip_blkno) {
1005 if (oi1->ip_blkno < oi2->ip_blkno) {
1006 /* switch id1 and id2 around */
1007 mlog(0, "switching them around...\n");
1008 tmpbh = bh2;
1009 bh2 = bh1;
1010 bh1 = tmpbh;
1011
1012 tmpinode = inode2;
1013 inode2 = inode1;
1014 inode1 = tmpinode;
1015 }
1016 /* lock id2 */
1017 status = ocfs2_meta_lock(inode2, bh2, 1);
1018 if (status < 0) {
1019 if (status != -ENOENT)
1020 mlog_errno(status);
1021 goto bail;
1022 }
1023 }
1024
1025 /* lock id1 */
1026 status = ocfs2_meta_lock(inode1, bh1, 1);
1027 if (status < 0) {
1028 /*
1029 * An error return must mean that no cluster locks
1030 * were held on function exit.
1031 */
1032 if (oi1->ip_blkno != oi2->ip_blkno)
1033 ocfs2_meta_unlock(inode2, 1);
1034
1035 if (status != -ENOENT)
1036 mlog_errno(status);
1037 }
1038
1039 bail:
1040 mlog_exit(status);
1041 return status;
1042 }
1043
1044 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1045 {
1046 ocfs2_meta_unlock(inode1, 1);
1047
1048 if (inode1 != inode2)
1049 ocfs2_meta_unlock(inode2, 1);
1050 }
1051
1052 #define PARENT_INO(buffer) \
1053 ((struct ocfs2_dir_entry *) \
1054 ((char *)buffer + \
1055 le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode
1056
1057 static int ocfs2_rename(struct inode *old_dir,
1058 struct dentry *old_dentry,
1059 struct inode *new_dir,
1060 struct dentry *new_dentry)
1061 {
1062 int status = 0, rename_lock = 0, parents_locked = 0;
1063 int old_child_locked = 0, new_child_locked = 0;
1064 struct inode *old_inode = old_dentry->d_inode;
1065 struct inode *new_inode = new_dentry->d_inode;
1066 struct inode *orphan_dir = NULL;
1067 struct ocfs2_dinode *newfe = NULL;
1068 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1069 struct buffer_head *orphan_entry_bh = NULL;
1070 struct buffer_head *newfe_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, new_dir_nlink = new_dir->i_nlink;
1083
1084 /* At some point it might be nice to break this function up a
1085 * bit. */
1086
1087 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
1088 old_dir, old_dentry, new_dir, new_dentry,
1089 old_dentry->d_name.len, old_dentry->d_name.name,
1090 new_dentry->d_name.len, new_dentry->d_name.name);
1091
1092 osb = OCFS2_SB(old_dir->i_sb);
1093
1094 if (new_inode) {
1095 if (!igrab(new_inode))
1096 BUG();
1097 }
1098
1099 /* Assume a directory heirarchy thusly:
1100 * a/b/c
1101 * a/d
1102 * a,b,c, and d are all directories.
1103 *
1104 * from cwd of 'a' on both nodes:
1105 * node1: mv b/c d
1106 * node2: mv d b/c
1107 *
1108 * And that's why, just like the VFS, we need a file system
1109 * rename lock. */
1110 if (old_dentry != new_dentry) {
1111 status = ocfs2_rename_lock(osb);
1112 if (status < 0) {
1113 mlog_errno(status);
1114 goto bail;
1115 }
1116 rename_lock = 1;
1117 }
1118
1119 /* if old and new are the same, this'll just do one lock. */
1120 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1121 &new_dir_bh, new_dir);
1122 if (status < 0) {
1123 mlog_errno(status);
1124 goto bail;
1125 }
1126 parents_locked = 1;
1127
1128 /* make sure both dirs have bhs
1129 * get an extra ref on old_dir_bh if old==new */
1130 if (!new_dir_bh) {
1131 if (old_dir_bh) {
1132 new_dir_bh = old_dir_bh;
1133 get_bh(new_dir_bh);
1134 } else {
1135 mlog(ML_ERROR, "no old_dir_bh!\n");
1136 status = -EIO;
1137 goto bail;
1138 }
1139 }
1140
1141 /*
1142 * Though we don't require an inode meta data update if
1143 * old_inode is not a directory, we lock anyway here to ensure
1144 * the vote thread on other nodes won't have to concurrently
1145 * downconvert the inode and the dentry locks.
1146 */
1147 status = ocfs2_meta_lock(old_inode, NULL, 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 /* now that the name has been added to new_dir, remove the old name */
1360 status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1361 if (status < 0) {
1362 mlog_errno(status);
1363 goto bail;
1364 }
1365
1366 if (new_inode) {
1367 new_inode->i_nlink--;
1368 new_inode->i_ctime = CURRENT_TIME;
1369 }
1370 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1371 if (old_inode_de_bh) {
1372 status = ocfs2_journal_access(handle, old_inode,
1373 old_inode_de_bh,
1374 OCFS2_JOURNAL_ACCESS_WRITE);
1375 PARENT_INO(old_inode_de_bh->b_data) =
1376 cpu_to_le64(OCFS2_I(new_dir)->ip_blkno);
1377 status = ocfs2_journal_dirty(handle, old_inode_de_bh);
1378 old_dir->i_nlink--;
1379 if (new_inode) {
1380 new_inode->i_nlink--;
1381 } else {
1382 inc_nlink(new_dir);
1383 mark_inode_dirty(new_dir);
1384 }
1385 }
1386 mark_inode_dirty(old_dir);
1387 if (new_inode)
1388 mark_inode_dirty(new_inode);
1389
1390 if (old_dir != new_dir)
1391 if (new_dir_nlink != new_dir->i_nlink) {
1392 if (!new_dir_bh) {
1393 mlog(ML_ERROR, "need to change nlink for new "
1394 "dir %llu from %d to %d but bh is NULL\n",
1395 (unsigned long long)OCFS2_I(new_dir)->ip_blkno,
1396 (int)new_dir_nlink, new_dir->i_nlink);
1397 } else {
1398 struct ocfs2_dinode *fe;
1399 status = ocfs2_journal_access(handle,
1400 new_dir,
1401 new_dir_bh,
1402 OCFS2_JOURNAL_ACCESS_WRITE);
1403 fe = (struct ocfs2_dinode *) new_dir_bh->b_data;
1404 fe->i_links_count = cpu_to_le16(new_dir->i_nlink);
1405 status = ocfs2_journal_dirty(handle, new_dir_bh);
1406 }
1407 }
1408
1409 if (old_dir_nlink != old_dir->i_nlink) {
1410 if (!old_dir_bh) {
1411 mlog(ML_ERROR, "need to change nlink for old dir "
1412 "%llu from %d to %d but bh is NULL!\n",
1413 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1414 (int)old_dir_nlink, old_dir->i_nlink);
1415 } else {
1416 struct ocfs2_dinode *fe;
1417 status = ocfs2_journal_access(handle, old_dir,
1418 old_dir_bh,
1419 OCFS2_JOURNAL_ACCESS_WRITE);
1420 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1421 fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1422 status = ocfs2_journal_dirty(handle, old_dir_bh);
1423 }
1424 }
1425
1426 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1427 status = 0;
1428 bail:
1429 if (rename_lock)
1430 ocfs2_rename_unlock(osb);
1431
1432 if (handle)
1433 ocfs2_commit_trans(osb, handle);
1434
1435 if (parents_locked)
1436 ocfs2_double_unlock(old_dir, new_dir);
1437
1438 if (old_child_locked)
1439 ocfs2_meta_unlock(old_inode, 1);
1440
1441 if (new_child_locked)
1442 ocfs2_meta_unlock(new_inode, 1);
1443
1444 if (orphan_dir) {
1445 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1446 ocfs2_meta_unlock(orphan_dir, 1);
1447 mutex_unlock(&orphan_dir->i_mutex);
1448 iput(orphan_dir);
1449 }
1450
1451 if (new_inode)
1452 sync_mapping_buffers(old_inode->i_mapping);
1453
1454 if (new_inode)
1455 iput(new_inode);
1456 if (newfe_bh)
1457 brelse(newfe_bh);
1458 if (old_dir_bh)
1459 brelse(old_dir_bh);
1460 if (new_dir_bh)
1461 brelse(new_dir_bh);
1462 if (new_de_bh)
1463 brelse(new_de_bh);
1464 if (old_de_bh)
1465 brelse(old_de_bh);
1466 if (old_inode_de_bh)
1467 brelse(old_inode_de_bh);
1468 if (orphan_entry_bh)
1469 brelse(orphan_entry_bh);
1470 if (insert_entry_bh)
1471 brelse(insert_entry_bh);
1472
1473 mlog_exit(status);
1474
1475 return status;
1476 }
1477
1478 /*
1479 * we expect i_size = strlen(symname). Copy symname into the file
1480 * data, including the null terminator.
1481 */
1482 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1483 handle_t *handle,
1484 struct inode *inode,
1485 const char *symname)
1486 {
1487 struct buffer_head **bhs = NULL;
1488 const char *c;
1489 struct super_block *sb = osb->sb;
1490 u64 p_blkno;
1491 int p_blocks;
1492 int virtual, blocks, status, i, bytes_left;
1493
1494 bytes_left = i_size_read(inode) + 1;
1495 /* we can't trust i_blocks because we're actually going to
1496 * write i_size + 1 bytes. */
1497 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1498
1499 mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1500 (unsigned long long)inode->i_blocks,
1501 i_size_read(inode), blocks);
1502
1503 /* Sanity check -- make sure we're going to fit. */
1504 if (bytes_left >
1505 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1506 status = -EIO;
1507 mlog_errno(status);
1508 goto bail;
1509 }
1510
1511 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1512 if (!bhs) {
1513 status = -ENOMEM;
1514 mlog_errno(status);
1515 goto bail;
1516 }
1517
1518 status = ocfs2_extent_map_get_blocks(inode, 0, 1, &p_blkno,
1519 &p_blocks);
1520 if (status < 0) {
1521 mlog_errno(status);
1522 goto bail;
1523 }
1524
1525 /* links can never be larger than one cluster so we know this
1526 * is all going to be contiguous, but do a sanity check
1527 * anyway. */
1528 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1529 status = -EIO;
1530 mlog_errno(status);
1531 goto bail;
1532 }
1533
1534 virtual = 0;
1535 while(bytes_left > 0) {
1536 c = &symname[virtual * sb->s_blocksize];
1537
1538 bhs[virtual] = sb_getblk(sb, p_blkno);
1539 if (!bhs[virtual]) {
1540 status = -ENOMEM;
1541 mlog_errno(status);
1542 goto bail;
1543 }
1544 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1545
1546 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1547 OCFS2_JOURNAL_ACCESS_CREATE);
1548 if (status < 0) {
1549 mlog_errno(status);
1550 goto bail;
1551 }
1552
1553 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1554
1555 memcpy(bhs[virtual]->b_data, c,
1556 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1557 bytes_left);
1558
1559 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1560 if (status < 0) {
1561 mlog_errno(status);
1562 goto bail;
1563 }
1564
1565 virtual++;
1566 p_blkno++;
1567 bytes_left -= sb->s_blocksize;
1568 }
1569
1570 status = 0;
1571 bail:
1572
1573 if (bhs) {
1574 for(i = 0; i < blocks; i++)
1575 if (bhs[i])
1576 brelse(bhs[i]);
1577 kfree(bhs);
1578 }
1579
1580 mlog_exit(status);
1581 return status;
1582 }
1583
1584 static int ocfs2_symlink(struct inode *dir,
1585 struct dentry *dentry,
1586 const char *symname)
1587 {
1588 int status, l, credits;
1589 u64 newsize;
1590 struct ocfs2_super *osb = NULL;
1591 struct inode *inode = NULL;
1592 struct super_block *sb;
1593 struct buffer_head *new_fe_bh = NULL;
1594 struct buffer_head *de_bh = NULL;
1595 struct buffer_head *parent_fe_bh = NULL;
1596 struct ocfs2_dinode *fe = NULL;
1597 struct ocfs2_dinode *dirfe;
1598 handle_t *handle = NULL;
1599 struct ocfs2_alloc_context *inode_ac = NULL;
1600 struct ocfs2_alloc_context *data_ac = NULL;
1601
1602 mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1603 dentry, symname, dentry->d_name.len, dentry->d_name.name);
1604
1605 sb = dir->i_sb;
1606 osb = OCFS2_SB(sb);
1607
1608 l = strlen(symname) + 1;
1609
1610 credits = ocfs2_calc_symlink_credits(sb);
1611
1612 /* lock the parent directory */
1613 status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
1614 if (status < 0) {
1615 if (status != -ENOENT)
1616 mlog_errno(status);
1617 return status;
1618 }
1619
1620 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1621 if (!dirfe->i_links_count) {
1622 /* can't make a file in a deleted directory. */
1623 status = -ENOENT;
1624 goto bail;
1625 }
1626
1627 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1628 dentry->d_name.len);
1629 if (status)
1630 goto bail;
1631
1632 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1633 dentry->d_name.name,
1634 dentry->d_name.len, &de_bh);
1635 if (status < 0) {
1636 mlog_errno(status);
1637 goto bail;
1638 }
1639
1640 status = ocfs2_reserve_new_inode(osb, &inode_ac);
1641 if (status < 0) {
1642 if (status != -ENOSPC)
1643 mlog_errno(status);
1644 goto bail;
1645 }
1646
1647 /* don't reserve bitmap space for fast symlinks. */
1648 if (l > ocfs2_fast_symlink_chars(sb)) {
1649 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
1650 if (status < 0) {
1651 if (status != -ENOSPC)
1652 mlog_errno(status);
1653 goto bail;
1654 }
1655 }
1656
1657 handle = ocfs2_start_trans(osb, credits);
1658 if (IS_ERR(handle)) {
1659 status = PTR_ERR(handle);
1660 handle = NULL;
1661 mlog_errno(status);
1662 goto bail;
1663 }
1664
1665 status = ocfs2_mknod_locked(osb, dir, dentry,
1666 S_IFLNK | S_IRWXUGO, 0,
1667 &new_fe_bh, parent_fe_bh, handle,
1668 &inode, inode_ac);
1669 if (status < 0) {
1670 mlog_errno(status);
1671 goto bail;
1672 }
1673
1674 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1675 inode->i_rdev = 0;
1676 newsize = l - 1;
1677 if (l > ocfs2_fast_symlink_chars(sb)) {
1678 inode->i_op = &ocfs2_symlink_inode_operations;
1679 status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh,
1680 handle, data_ac, NULL,
1681 NULL);
1682 if (status < 0) {
1683 if (status != -ENOSPC && status != -EINTR) {
1684 mlog(ML_ERROR,
1685 "Failed to extend file to %llu\n",
1686 (unsigned long long)newsize);
1687 mlog_errno(status);
1688 status = -ENOSPC;
1689 }
1690 goto bail;
1691 }
1692 i_size_write(inode, newsize);
1693 inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize);
1694 } else {
1695 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1696 memcpy((char *) fe->id2.i_symlink, symname, l);
1697 i_size_write(inode, newsize);
1698 inode->i_blocks = 0;
1699 }
1700
1701 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1702 if (status < 0) {
1703 mlog_errno(status);
1704 goto bail;
1705 }
1706
1707 if (!ocfs2_inode_is_fast_symlink(inode)) {
1708 status = ocfs2_create_symlink_data(osb, handle, inode,
1709 symname);
1710 if (status < 0) {
1711 mlog_errno(status);
1712 goto bail;
1713 }
1714 }
1715
1716 status = ocfs2_add_entry(handle, dentry, inode,
1717 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1718 de_bh);
1719 if (status < 0) {
1720 mlog_errno(status);
1721 goto bail;
1722 }
1723
1724 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1725 if (status) {
1726 mlog_errno(status);
1727 goto bail;
1728 }
1729
1730 insert_inode_hash(inode);
1731 dentry->d_op = &ocfs2_dentry_ops;
1732 d_instantiate(dentry, inode);
1733 bail:
1734 if (handle)
1735 ocfs2_commit_trans(osb, handle);
1736
1737 ocfs2_meta_unlock(dir, 1);
1738
1739 if (new_fe_bh)
1740 brelse(new_fe_bh);
1741 if (parent_fe_bh)
1742 brelse(parent_fe_bh);
1743 if (de_bh)
1744 brelse(de_bh);
1745 if (inode_ac)
1746 ocfs2_free_alloc_context(inode_ac);
1747 if (data_ac)
1748 ocfs2_free_alloc_context(data_ac);
1749 if ((status < 0) && inode)
1750 iput(inode);
1751
1752 mlog_exit(status);
1753
1754 return status;
1755 }
1756
1757 int ocfs2_check_dir_entry(struct inode * dir,
1758 struct ocfs2_dir_entry * de,
1759 struct buffer_head * bh,
1760 unsigned long offset)
1761 {
1762 const char *error_msg = NULL;
1763 const int rlen = le16_to_cpu(de->rec_len);
1764
1765 if (rlen < OCFS2_DIR_REC_LEN(1))
1766 error_msg = "rec_len is smaller than minimal";
1767 else if (rlen % 4 != 0)
1768 error_msg = "rec_len % 4 != 0";
1769 else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
1770 error_msg = "rec_len is too small for name_len";
1771 else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
1772 error_msg = "directory entry across blocks";
1773
1774 if (error_msg != NULL)
1775 mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
1776 "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
1777 (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
1778 offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
1779 de->name_len);
1780 return error_msg == NULL ? 1 : 0;
1781 }
1782
1783 /* we don't always have a dentry for what we want to add, so people
1784 * like orphan dir can call this instead.
1785 *
1786 * If you pass me insert_bh, I'll skip the search of the other dir
1787 * blocks and put the record in there.
1788 */
1789 static int __ocfs2_add_entry(handle_t *handle,
1790 struct inode *dir,
1791 const char *name, int namelen,
1792 struct inode *inode, u64 blkno,
1793 struct buffer_head *parent_fe_bh,
1794 struct buffer_head *insert_bh)
1795 {
1796 unsigned long offset;
1797 unsigned short rec_len;
1798 struct ocfs2_dir_entry *de, *de1;
1799 struct super_block *sb;
1800 int retval, status;
1801
1802 mlog_entry_void();
1803
1804 sb = dir->i_sb;
1805
1806 if (!namelen)
1807 return -EINVAL;
1808
1809 rec_len = OCFS2_DIR_REC_LEN(namelen);
1810 offset = 0;
1811 de = (struct ocfs2_dir_entry *) insert_bh->b_data;
1812 while (1) {
1813 BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data);
1814 /* These checks should've already been passed by the
1815 * prepare function, but I guess we can leave them
1816 * here anyway. */
1817 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
1818 retval = -ENOENT;
1819 goto bail;
1820 }
1821 if (ocfs2_match(namelen, name, de)) {
1822 retval = -EEXIST;
1823 goto bail;
1824 }
1825 if (((le64_to_cpu(de->inode) == 0) &&
1826 (le16_to_cpu(de->rec_len) >= rec_len)) ||
1827 (le16_to_cpu(de->rec_len) >=
1828 (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
1829 status = ocfs2_journal_access(handle, dir, insert_bh,
1830 OCFS2_JOURNAL_ACCESS_WRITE);
1831 /* By now the buffer is marked for journaling */
1832 offset += le16_to_cpu(de->rec_len);
1833 if (le64_to_cpu(de->inode)) {
1834 de1 = (struct ocfs2_dir_entry *)((char *) de +
1835 OCFS2_DIR_REC_LEN(de->name_len));
1836 de1->rec_len =
1837 cpu_to_le16(le16_to_cpu(de->rec_len) -
1838 OCFS2_DIR_REC_LEN(de->name_len));
1839 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
1840 de = de1;
1841 }
1842 de->file_type = OCFS2_FT_UNKNOWN;
1843 if (blkno) {
1844 de->inode = cpu_to_le64(blkno);
1845 ocfs2_set_de_type(de, inode->i_mode);
1846 } else
1847 de->inode = 0;
1848 de->name_len = namelen;
1849 memcpy(de->name, name, namelen);
1850
1851 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
1852 dir->i_version++;
1853 status = ocfs2_journal_dirty(handle, insert_bh);
1854 retval = 0;
1855 goto bail;
1856 }
1857 offset += le16_to_cpu(de->rec_len);
1858 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
1859 }
1860
1861 /* when you think about it, the assert above should prevent us
1862 * from ever getting here. */
1863 retval = -ENOSPC;
1864 bail:
1865
1866 mlog_exit(retval);
1867 return retval;
1868 }
1869
1870
1871 /*
1872 * ocfs2_delete_entry deletes a directory entry by merging it with the
1873 * previous entry
1874 */
1875 static int ocfs2_delete_entry(handle_t *handle,
1876 struct inode *dir,
1877 struct ocfs2_dir_entry *de_del,
1878 struct buffer_head *bh)
1879 {
1880 struct ocfs2_dir_entry *de, *pde;
1881 int i, status = -ENOENT;
1882
1883 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
1884
1885 i = 0;
1886 pde = NULL;
1887 de = (struct ocfs2_dir_entry *) bh->b_data;
1888 while (i < bh->b_size) {
1889 if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
1890 status = -EIO;
1891 mlog_errno(status);
1892 goto bail;
1893 }
1894 if (de == de_del) {
1895 status = ocfs2_journal_access(handle, dir, bh,
1896 OCFS2_JOURNAL_ACCESS_WRITE);
1897 if (status < 0) {
1898 status = -EIO;
1899 mlog_errno(status);
1900 goto bail;
1901 }
1902 if (pde)
1903 pde->rec_len =
1904 cpu_to_le16(le16_to_cpu(pde->rec_len) +
1905 le16_to_cpu(de->rec_len));
1906 else
1907 de->inode = 0;
1908 dir->i_version++;
1909 status = ocfs2_journal_dirty(handle, bh);
1910 goto bail;
1911 }
1912 i += le16_to_cpu(de->rec_len);
1913 pde = de;
1914 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
1915 }
1916 bail:
1917 mlog_exit(status);
1918 return status;
1919 }
1920
1921 /*
1922 * Returns 0 if not found, -1 on failure, and 1 on success
1923 */
1924 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
1925 struct inode *dir,
1926 const char *name, int namelen,
1927 unsigned long offset,
1928 struct ocfs2_dir_entry **res_dir)
1929 {
1930 struct ocfs2_dir_entry *de;
1931 char *dlimit, *de_buf;
1932 int de_len;
1933 int ret = 0;
1934
1935 mlog_entry_void();
1936
1937 de_buf = bh->b_data;
1938 dlimit = de_buf + dir->i_sb->s_blocksize;
1939
1940 while (de_buf < dlimit) {
1941 /* this code is executed quadratically often */
1942 /* do minimal checking `by hand' */
1943
1944 de = (struct ocfs2_dir_entry *) de_buf;
1945
1946 if (de_buf + namelen <= dlimit &&
1947 ocfs2_match(namelen, name, de)) {
1948 /* found a match - just to be sure, do a full check */
1949 if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
1950 ret = -1;
1951 goto bail;
1952 }
1953 *res_dir = de;
1954 ret = 1;
1955 goto bail;
1956 }
1957
1958 /* prevent looping on a bad block */
1959 de_len = le16_to_cpu(de->rec_len);
1960 if (de_len <= 0) {
1961 ret = -1;
1962 goto bail;
1963 }
1964
1965 de_buf += de_len;
1966 offset += de_len;
1967 }
1968
1969 bail:
1970 mlog_exit(ret);
1971 return ret;
1972 }
1973
1974 struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
1975 struct inode *dir,
1976 struct ocfs2_dir_entry **res_dir)
1977 {
1978 struct super_block *sb;
1979 struct buffer_head *bh_use[NAMEI_RA_SIZE];
1980 struct buffer_head *bh, *ret = NULL;
1981 unsigned long start, block, b;
1982 int ra_max = 0; /* Number of bh's in the readahead
1983 buffer, bh_use[] */
1984 int ra_ptr = 0; /* Current index into readahead
1985 buffer */
1986 int num = 0;
1987 int nblocks, i, err;
1988
1989 mlog_entry_void();
1990
1991 *res_dir = NULL;
1992 sb = dir->i_sb;
1993
1994 nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
1995 start = OCFS2_I(dir)->ip_dir_start_lookup;
1996 if (start >= nblocks)
1997 start = 0;
1998 block = start;
1999
2000 restart:
2001 do {
2002 /*
2003 * We deal with the read-ahead logic here.
2004 */
2005 if (ra_ptr >= ra_max) {
2006 /* Refill the readahead buffer */
2007 ra_ptr = 0;
2008 b = block;
2009 for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
2010 /*
2011 * Terminate if we reach the end of the
2012 * directory and must wrap, or if our
2013 * search has finished at this block.
2014 */
2015 if (b >= nblocks || (num && block == start)) {
2016 bh_use[ra_max] = NULL;
2017 break;
2018 }
2019 num++;
2020
2021 bh = ocfs2_bread(dir, b++, &err, 1);
2022 bh_use[ra_max] = bh;
2023 }
2024 }
2025 if ((bh = bh_use[ra_ptr++]) == NULL)
2026 goto next;
2027 wait_on_buffer(bh);
2028 if (!buffer_uptodate(bh)) {
2029 /* read error, skip block & hope for the best */
2030 ocfs2_error(dir->i_sb, "reading directory %llu, "
2031 "offset %lu\n",
2032 (unsigned long long)OCFS2_I(dir)->ip_blkno,
2033 block);
2034 brelse(bh);
2035 goto next;
2036 }
2037 i = ocfs2_search_dirblock(bh, dir, name, namelen,
2038 block << sb->s_blocksize_bits,
2039 res_dir);
2040 if (i == 1) {
2041 OCFS2_I(dir)->ip_dir_start_lookup = block;
2042 ret = bh;
2043 goto cleanup_and_exit;
2044 } else {
2045 brelse(bh);
2046 if (i < 0)
2047 goto cleanup_and_exit;
2048 }
2049 next:
2050 if (++block >= nblocks)
2051 block = 0;
2052 } while (block != start);
2053
2054 /*
2055 * If the directory has grown while we were searching, then
2056 * search the last part of the directory before giving up.
2057 */
2058 block = nblocks;
2059 nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2060 if (block < nblocks) {
2061 start = 0;
2062 goto restart;
2063 }
2064
2065 cleanup_and_exit:
2066 /* Clean up the read-ahead blocks */
2067 for (; ra_ptr < ra_max; ra_ptr++)
2068 brelse(bh_use[ra_ptr]);
2069
2070 mlog_exit_ptr(ret);
2071 return ret;
2072 }
2073
2074 static int ocfs2_blkno_stringify(u64 blkno, char *name)
2075 {
2076 int status, namelen;
2077
2078 mlog_entry_void();
2079
2080 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
2081 (long long)blkno);
2082 if (namelen <= 0) {
2083 if (namelen)
2084 status = namelen;
2085 else
2086 status = -EINVAL;
2087 mlog_errno(status);
2088 goto bail;
2089 }
2090 if (namelen != OCFS2_ORPHAN_NAMELEN) {
2091 status = -EINVAL;
2092 mlog_errno(status);
2093 goto bail;
2094 }
2095
2096 mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
2097 namelen);
2098
2099 status = 0;
2100 bail:
2101 mlog_exit(status);
2102 return status;
2103 }
2104
2105 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2106 struct inode **ret_orphan_dir,
2107 struct inode *inode,
2108 char *name,
2109 struct buffer_head **de_bh)
2110 {
2111 struct inode *orphan_dir_inode;
2112 struct buffer_head *orphan_dir_bh = NULL;
2113 int status = 0;
2114
2115 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2116 if (status < 0) {
2117 mlog_errno(status);
2118 return status;
2119 }
2120
2121 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2122 ORPHAN_DIR_SYSTEM_INODE,
2123 osb->slot_num);
2124 if (!orphan_dir_inode) {
2125 status = -ENOENT;
2126 mlog_errno(status);
2127 return status;
2128 }
2129
2130 mutex_lock(&orphan_dir_inode->i_mutex);
2131
2132 status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2133 if (status < 0) {
2134 mlog_errno(status);
2135 goto leave;
2136 }
2137
2138 status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2139 orphan_dir_bh, name,
2140 OCFS2_ORPHAN_NAMELEN, de_bh);
2141 if (status < 0) {
2142 ocfs2_meta_unlock(orphan_dir_inode, 1);
2143
2144 mlog_errno(status);
2145 goto leave;
2146 }
2147
2148 *ret_orphan_dir = orphan_dir_inode;
2149
2150 leave:
2151 if (status) {
2152 mutex_unlock(&orphan_dir_inode->i_mutex);
2153 iput(orphan_dir_inode);
2154 }
2155
2156 if (orphan_dir_bh)
2157 brelse(orphan_dir_bh);
2158
2159 mlog_exit(status);
2160 return status;
2161 }
2162
2163 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2164 handle_t *handle,
2165 struct inode *inode,
2166 struct ocfs2_dinode *fe,
2167 char *name,
2168 struct buffer_head *de_bh,
2169 struct inode *orphan_dir_inode)
2170 {
2171 struct buffer_head *orphan_dir_bh = NULL;
2172 int status = 0;
2173 struct ocfs2_dinode *orphan_fe;
2174
2175 mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
2176
2177 status = ocfs2_read_block(osb,
2178 OCFS2_I(orphan_dir_inode)->ip_blkno,
2179 &orphan_dir_bh, OCFS2_BH_CACHED,
2180 orphan_dir_inode);
2181 if (status < 0) {
2182 mlog_errno(status);
2183 goto leave;
2184 }
2185
2186 status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
2187 OCFS2_JOURNAL_ACCESS_WRITE);
2188 if (status < 0) {
2189 mlog_errno(status);
2190 goto leave;
2191 }
2192
2193 /* we're a cluster, and nlink can change on disk from
2194 * underneath us... */
2195 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2196 if (S_ISDIR(inode->i_mode))
2197 le16_add_cpu(&orphan_fe->i_links_count, 1);
2198 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2199
2200 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2201 if (status < 0) {
2202 mlog_errno(status);
2203 goto leave;
2204 }
2205
2206 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2207 OCFS2_ORPHAN_NAMELEN, inode,
2208 OCFS2_I(inode)->ip_blkno,
2209 orphan_dir_bh, de_bh);
2210 if (status < 0) {
2211 mlog_errno(status);
2212 goto leave;
2213 }
2214
2215 le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2216
2217 /* Record which orphan dir our inode now resides
2218 * in. delete_inode will use this to determine which orphan
2219 * dir to lock. */
2220 spin_lock(&OCFS2_I(inode)->ip_lock);
2221 OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num;
2222 spin_unlock(&OCFS2_I(inode)->ip_lock);
2223
2224 mlog(0, "Inode %llu orphaned in slot %d\n",
2225 (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
2226
2227 leave:
2228 if (orphan_dir_bh)
2229 brelse(orphan_dir_bh);
2230
2231 mlog_exit(status);
2232 return status;
2233 }
2234
2235 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2236 int ocfs2_orphan_del(struct ocfs2_super *osb,
2237 handle_t *handle,
2238 struct inode *orphan_dir_inode,
2239 struct inode *inode,
2240 struct buffer_head *orphan_dir_bh)
2241 {
2242 char name[OCFS2_ORPHAN_NAMELEN + 1];
2243 struct ocfs2_dinode *orphan_fe;
2244 int status = 0;
2245 struct buffer_head *target_de_bh = NULL;
2246 struct ocfs2_dir_entry *target_de = NULL;
2247
2248 mlog_entry_void();
2249
2250 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2251 if (status < 0) {
2252 mlog_errno(status);
2253 goto leave;
2254 }
2255
2256 mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
2257 name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2258 OCFS2_ORPHAN_NAMELEN);
2259
2260 /* find it's spot in the orphan directory */
2261 target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
2262 orphan_dir_inode, &target_de);
2263 if (!target_de_bh) {
2264 status = -ENOENT;
2265 mlog_errno(status);
2266 goto leave;
2267 }
2268
2269 /* remove it from the orphan directory */
2270 status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
2271 target_de_bh);
2272 if (status < 0) {
2273 mlog_errno(status);
2274 goto leave;
2275 }
2276
2277 status = ocfs2_journal_access(handle,orphan_dir_inode, orphan_dir_bh,
2278 OCFS2_JOURNAL_ACCESS_WRITE);
2279 if (status < 0) {
2280 mlog_errno(status);
2281 goto leave;
2282 }
2283
2284 /* do the i_nlink dance! :) */
2285 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2286 if (S_ISDIR(inode->i_mode))
2287 le16_add_cpu(&orphan_fe->i_links_count, -1);
2288 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2289
2290 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2291 if (status < 0) {
2292 mlog_errno(status);
2293 goto leave;
2294 }
2295
2296 leave:
2297 if (target_de_bh)
2298 brelse(target_de_bh);
2299
2300 mlog_exit(status);
2301 return status;
2302 }
2303
2304 struct inode_operations ocfs2_dir_iops = {
2305 .create = ocfs2_create,
2306 .lookup = ocfs2_lookup,
2307 .link = ocfs2_link,
2308 .unlink = ocfs2_unlink,
2309 .rmdir = ocfs2_unlink,
2310 .symlink = ocfs2_symlink,
2311 .mkdir = ocfs2_mkdir,
2312 .mknod = ocfs2_mknod,
2313 .rename = ocfs2_rename,
2314 .setattr = ocfs2_setattr,
2315 .getattr = ocfs2_getattr,
2316 .permission = ocfs2_permission,
2317 };
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