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[PATCH] uml: SIGIO formatting fixes
[linux-2.6/btrfs-unstable.git] / fs / ocfs2 / namei.c
blobf3d7803b4b46f18622cbb6156a25f80fa6b89a82
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 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
936 if (S_ISDIR(inode->i_mode))
937 drop_nlink(dir);
938
939 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
940 if (status < 0) {
941 mlog_errno(status);
942 if (S_ISDIR(inode->i_mode))
943 inc_nlink(dir);
944 }
945
946 leave:
947 if (handle)
948 ocfs2_commit_trans(osb, handle);
949
950 if (child_locked)
951 ocfs2_meta_unlock(inode, 1);
952
953 ocfs2_meta_unlock(dir, 1);
954
955 if (orphan_dir) {
956 /* This was locked for us in ocfs2_prepare_orphan_dir() */
957 ocfs2_meta_unlock(orphan_dir, 1);
958 mutex_unlock(&orphan_dir->i_mutex);
959 iput(orphan_dir);
960 }
961
962 if (fe_bh)
963 brelse(fe_bh);
964
965 if (dirent_bh)
966 brelse(dirent_bh);
967
968 if (parent_node_bh)
969 brelse(parent_node_bh);
970
971 if (orphan_entry_bh)
972 brelse(orphan_entry_bh);
973
974 mlog_exit(status);
975
976 return status;
977 }
978
979 /*
980 * The only place this should be used is rename!
981 * if they have the same id, then the 1st one is the only one locked.
982 */
983 static int ocfs2_double_lock(struct ocfs2_super *osb,
984 struct buffer_head **bh1,
985 struct inode *inode1,
986 struct buffer_head **bh2,
987 struct inode *inode2)
988 {
989 int status;
990 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
991 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
992 struct buffer_head **tmpbh;
993 struct inode *tmpinode;
994
995 mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
996 (unsigned long long)oi1->ip_blkno,
997 (unsigned long long)oi2->ip_blkno);
998
999 if (*bh1)
1000 *bh1 = NULL;
1001 if (*bh2)
1002 *bh2 = NULL;
1003
1004 /* we always want to lock the one with the lower lockid first. */
1005 if (oi1->ip_blkno != oi2->ip_blkno) {
1006 if (oi1->ip_blkno < oi2->ip_blkno) {
1007 /* switch id1 and id2 around */
1008 mlog(0, "switching them around...\n");
1009 tmpbh = bh2;
1010 bh2 = bh1;
1011 bh1 = tmpbh;
1012
1013 tmpinode = inode2;
1014 inode2 = inode1;
1015 inode1 = tmpinode;
1016 }
1017 /* lock id2 */
1018 status = ocfs2_meta_lock(inode2, bh2, 1);
1019 if (status < 0) {
1020 if (status != -ENOENT)
1021 mlog_errno(status);
1022 goto bail;
1023 }
1024 }
1025
1026 /* lock id1 */
1027 status = ocfs2_meta_lock(inode1, bh1, 1);
1028 if (status < 0) {
1029 /*
1030 * An error return must mean that no cluster locks
1031 * were held on function exit.
1032 */
1033 if (oi1->ip_blkno != oi2->ip_blkno)
1034 ocfs2_meta_unlock(inode2, 1);
1035
1036 if (status != -ENOENT)
1037 mlog_errno(status);
1038 }
1039
1040 bail:
1041 mlog_exit(status);
1042 return status;
1043 }
1044
1045 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1046 {
1047 ocfs2_meta_unlock(inode1, 1);
1048
1049 if (inode1 != inode2)
1050 ocfs2_meta_unlock(inode2, 1);
1051 }
1052
1053 #define PARENT_INO(buffer) \
1054 ((struct ocfs2_dir_entry *) \
1055 ((char *)buffer + \
1056 le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode
1057
1058 static int ocfs2_rename(struct inode *old_dir,
1059 struct dentry *old_dentry,
1060 struct inode *new_dir,
1061 struct dentry *new_dentry)
1062 {
1063 int status = 0, rename_lock = 0, parents_locked = 0;
1064 int old_child_locked = 0, new_child_locked = 0;
1065 struct inode *old_inode = old_dentry->d_inode;
1066 struct inode *new_inode = new_dentry->d_inode;
1067 struct inode *orphan_dir = NULL;
1068 struct ocfs2_dinode *newfe = NULL;
1069 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1070 struct buffer_head *orphan_entry_bh = NULL;
1071 struct buffer_head *newfe_bh = NULL;
1072 struct buffer_head *old_inode_bh = NULL;
1073 struct buffer_head *insert_entry_bh = NULL;
1074 struct ocfs2_super *osb = NULL;
1075 u64 newfe_blkno;
1076 handle_t *handle = NULL;
1077 struct buffer_head *old_dir_bh = NULL;
1078 struct buffer_head *new_dir_bh = NULL;
1079 struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry
1080 // and new_dentry
1081 struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
1082 struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
1083 // this is the 1st dirent bh
1084 nlink_t old_dir_nlink = old_dir->i_nlink;
1085
1086 /* At some point it might be nice to break this function up a
1087 * bit. */
1088
1089 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
1090 old_dir, old_dentry, new_dir, new_dentry,
1091 old_dentry->d_name.len, old_dentry->d_name.name,
1092 new_dentry->d_name.len, new_dentry->d_name.name);
1093
1094 osb = OCFS2_SB(old_dir->i_sb);
1095
1096 if (new_inode) {
1097 if (!igrab(new_inode))
1098 BUG();
1099 }
1100
1101 /* Assume a directory heirarchy thusly:
1102 * a/b/c
1103 * a/d
1104 * a,b,c, and d are all directories.
1105 *
1106 * from cwd of 'a' on both nodes:
1107 * node1: mv b/c d
1108 * node2: mv d b/c
1109 *
1110 * And that's why, just like the VFS, we need a file system
1111 * rename lock. */
1112 if (old_dentry != new_dentry) {
1113 status = ocfs2_rename_lock(osb);
1114 if (status < 0) {
1115 mlog_errno(status);
1116 goto bail;
1117 }
1118 rename_lock = 1;
1119 }
1120
1121 /* if old and new are the same, this'll just do one lock. */
1122 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1123 &new_dir_bh, new_dir);
1124 if (status < 0) {
1125 mlog_errno(status);
1126 goto bail;
1127 }
1128 parents_locked = 1;
1129
1130 /* make sure both dirs have bhs
1131 * get an extra ref on old_dir_bh if old==new */
1132 if (!new_dir_bh) {
1133 if (old_dir_bh) {
1134 new_dir_bh = old_dir_bh;
1135 get_bh(new_dir_bh);
1136 } else {
1137 mlog(ML_ERROR, "no old_dir_bh!\n");
1138 status = -EIO;
1139 goto bail;
1140 }
1141 }
1142
1143 /*
1144 * Aside from allowing a meta data update, the locking here
1145 * also ensures that the vote thread on other nodes won't have
1146 * to concurrently downconvert the inode and the dentry locks.
1147 */
1148 status = ocfs2_meta_lock(old_inode, &old_inode_bh, 1);
1149 if (status < 0) {
1150 if (status != -ENOENT)
1151 mlog_errno(status);
1152 goto bail;
1153 }
1154 old_child_locked = 1;
1155
1156 status = ocfs2_remote_dentry_delete(old_dentry);
1157 if (status < 0) {
1158 mlog_errno(status);
1159 goto bail;
1160 }
1161
1162 if (S_ISDIR(old_inode->i_mode)) {
1163 status = -EIO;
1164 old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0);
1165 if (!old_inode_de_bh)
1166 goto bail;
1167
1168 status = -EIO;
1169 if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) !=
1170 OCFS2_I(old_dir)->ip_blkno)
1171 goto bail;
1172 status = -EMLINK;
1173 if (!new_inode && new_dir!=old_dir &&
1174 new_dir->i_nlink >= OCFS2_LINK_MAX)
1175 goto bail;
1176 }
1177
1178 status = -ENOENT;
1179 old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1180 old_dentry->d_name.len,
1181 old_dir, &old_de);
1182 if (!old_de_bh)
1183 goto bail;
1184
1185 /*
1186 * Check for inode number is _not_ due to possible IO errors.
1187 * We might rmdir the source, keep it as pwd of some process
1188 * and merrily kill the link to whatever was created under the
1189 * same name. Goodbye sticky bit ;-<
1190 */
1191 if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno)
1192 goto bail;
1193
1194 /* check if the target already exists (in which case we need
1195 * to delete it */
1196 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1197 new_dentry->d_name.len,
1198 &newfe_blkno, new_dir, &new_de_bh,
1199 &new_de);
1200 /* The only error we allow here is -ENOENT because the new
1201 * file not existing is perfectly valid. */
1202 if ((status < 0) && (status != -ENOENT)) {
1203 /* If we cannot find the file specified we should just */
1204 /* return the error... */
1205 mlog_errno(status);
1206 goto bail;
1207 }
1208
1209 if (!new_de && new_inode)
1210 mlog(ML_ERROR, "inode %lu does not exist in it's parent "
1211 "directory!", new_inode->i_ino);
1212
1213 /* In case we need to overwrite an existing file, we blow it
1214 * away first */
1215 if (new_de) {
1216 /* VFS didn't think there existed an inode here, but
1217 * someone else in the cluster must have raced our
1218 * rename to create one. Today we error cleanly, in
1219 * the future we should consider calling iget to build
1220 * a new struct inode for this entry. */
1221 if (!new_inode) {
1222 status = -EACCES;
1223
1224 mlog(0, "We found an inode for name %.*s but VFS "
1225 "didn't give us one.\n", new_dentry->d_name.len,
1226 new_dentry->d_name.name);
1227 goto bail;
1228 }
1229
1230 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1231 status = -EACCES;
1232
1233 mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1234 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1235 (unsigned long long)newfe_blkno,
1236 OCFS2_I(new_inode)->ip_flags);
1237 goto bail;
1238 }
1239
1240 status = ocfs2_meta_lock(new_inode, &newfe_bh, 1);
1241 if (status < 0) {
1242 if (status != -ENOENT)
1243 mlog_errno(status);
1244 goto bail;
1245 }
1246 new_child_locked = 1;
1247
1248 status = ocfs2_remote_dentry_delete(new_dentry);
1249 if (status < 0) {
1250 mlog_errno(status);
1251 goto bail;
1252 }
1253
1254 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1255
1256 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1257 "newfebh=%p bhblocknr=%llu\n", new_de,
1258 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1259 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1260
1261 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1262 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1263 new_inode,
1264 orphan_name,
1265 &orphan_entry_bh);
1266 if (status < 0) {
1267 mlog_errno(status);
1268 goto bail;
1269 }
1270 }
1271 } else {
1272 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1273
1274 status = ocfs2_check_dir_for_entry(new_dir,
1275 new_dentry->d_name.name,
1276 new_dentry->d_name.len);
1277 if (status)
1278 goto bail;
1279
1280 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1281 new_dentry->d_name.name,
1282 new_dentry->d_name.len,
1283 &insert_entry_bh);
1284 if (status < 0) {
1285 mlog_errno(status);
1286 goto bail;
1287 }
1288 }
1289
1290 handle = ocfs2_start_trans(osb, OCFS2_RENAME_CREDITS);
1291 if (IS_ERR(handle)) {
1292 status = PTR_ERR(handle);
1293 handle = NULL;
1294 mlog_errno(status);
1295 goto bail;
1296 }
1297
1298 if (new_de) {
1299 if (S_ISDIR(new_inode->i_mode)) {
1300 if (!ocfs2_empty_dir(new_inode) ||
1301 new_inode->i_nlink != 2) {
1302 status = -ENOTEMPTY;
1303 goto bail;
1304 }
1305 }
1306 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1307 OCFS2_JOURNAL_ACCESS_WRITE);
1308 if (status < 0) {
1309 mlog_errno(status);
1310 goto bail;
1311 }
1312
1313 if (S_ISDIR(new_inode->i_mode) ||
1314 (newfe->i_links_count == cpu_to_le16(1))){
1315 status = ocfs2_orphan_add(osb, handle, new_inode,
1316 newfe, orphan_name,
1317 orphan_entry_bh, orphan_dir);
1318 if (status < 0) {
1319 mlog_errno(status);
1320 goto bail;
1321 }
1322 }
1323
1324 /* change the dirent to point to the correct inode */
1325 status = ocfs2_journal_access(handle, new_dir, new_de_bh,
1326 OCFS2_JOURNAL_ACCESS_WRITE);
1327 if (status < 0) {
1328 mlog_errno(status);
1329 goto bail;
1330 }
1331 new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno);
1332 new_de->file_type = old_de->file_type;
1333 new_dir->i_version++;
1334 status = ocfs2_journal_dirty(handle, new_de_bh);
1335 if (status < 0) {
1336 mlog_errno(status);
1337 goto bail;
1338 }
1339
1340 if (S_ISDIR(new_inode->i_mode))
1341 newfe->i_links_count = 0;
1342 else
1343 le16_add_cpu(&newfe->i_links_count, -1);
1344
1345 status = ocfs2_journal_dirty(handle, newfe_bh);
1346 if (status < 0) {
1347 mlog_errno(status);
1348 goto bail;
1349 }
1350 } else {
1351 /* if the name was not found in new_dir, add it now */
1352 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1353 OCFS2_I(old_inode)->ip_blkno,
1354 new_dir_bh, insert_entry_bh);
1355 }
1356
1357 old_inode->i_ctime = CURRENT_TIME;
1358 mark_inode_dirty(old_inode);
1359 ocfs2_mark_inode_dirty(handle, old_inode, old_inode_bh);
1360
1361 /* now that the name has been added to new_dir, remove the old name */
1362 status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1363 if (status < 0) {
1364 mlog_errno(status);
1365 goto bail;
1366 }
1367
1368 if (new_inode) {
1369 new_inode->i_nlink--;
1370 new_inode->i_ctime = CURRENT_TIME;
1371 }
1372 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1373 if (old_inode_de_bh) {
1374 status = ocfs2_journal_access(handle, old_inode,
1375 old_inode_de_bh,
1376 OCFS2_JOURNAL_ACCESS_WRITE);
1377 PARENT_INO(old_inode_de_bh->b_data) =
1378 cpu_to_le64(OCFS2_I(new_dir)->ip_blkno);
1379 status = ocfs2_journal_dirty(handle, old_inode_de_bh);
1380 old_dir->i_nlink--;
1381 if (new_inode) {
1382 new_inode->i_nlink--;
1383 } else {
1384 inc_nlink(new_dir);
1385 mark_inode_dirty(new_dir);
1386 }
1387 }
1388 mark_inode_dirty(old_dir);
1389 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1390 if (new_inode) {
1391 mark_inode_dirty(new_inode);
1392 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1393 }
1394
1395 if (old_dir != new_dir) {
1396 /* Keep the same times on both directories.*/
1397 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1398
1399 /*
1400 * This will also pick up the i_nlink change from the
1401 * block above.
1402 */
1403 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1404 }
1405
1406 if (old_dir_nlink != old_dir->i_nlink) {
1407 if (!old_dir_bh) {
1408 mlog(ML_ERROR, "need to change nlink for old dir "
1409 "%llu from %d to %d but bh is NULL!\n",
1410 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1411 (int)old_dir_nlink, old_dir->i_nlink);
1412 } else {
1413 struct ocfs2_dinode *fe;
1414 status = ocfs2_journal_access(handle, old_dir,
1415 old_dir_bh,
1416 OCFS2_JOURNAL_ACCESS_WRITE);
1417 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1418 fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1419 status = ocfs2_journal_dirty(handle, old_dir_bh);
1420 }
1421 }
1422
1423 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1424 status = 0;
1425 bail:
1426 if (rename_lock)
1427 ocfs2_rename_unlock(osb);
1428
1429 if (handle)
1430 ocfs2_commit_trans(osb, handle);
1431
1432 if (parents_locked)
1433 ocfs2_double_unlock(old_dir, new_dir);
1434
1435 if (old_child_locked)
1436 ocfs2_meta_unlock(old_inode, 1);
1437
1438 if (new_child_locked)
1439 ocfs2_meta_unlock(new_inode, 1);
1440
1441 if (orphan_dir) {
1442 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1443 ocfs2_meta_unlock(orphan_dir, 1);
1444 mutex_unlock(&orphan_dir->i_mutex);
1445 iput(orphan_dir);
1446 }
1447
1448 if (new_inode)
1449 sync_mapping_buffers(old_inode->i_mapping);
1450
1451 if (new_inode)
1452 iput(new_inode);
1453 if (newfe_bh)
1454 brelse(newfe_bh);
1455 if (old_inode_bh)
1456 brelse(old_inode_bh);
1457 if (old_dir_bh)
1458 brelse(old_dir_bh);
1459 if (new_dir_bh)
1460 brelse(new_dir_bh);
1461 if (new_de_bh)
1462 brelse(new_de_bh);
1463 if (old_de_bh)
1464 brelse(old_de_bh);
1465 if (old_inode_de_bh)
1466 brelse(old_inode_de_bh);
1467 if (orphan_entry_bh)
1468 brelse(orphan_entry_bh);
1469 if (insert_entry_bh)
1470 brelse(insert_entry_bh);
1471
1472 mlog_exit(status);
1473
1474 return status;
1475 }
1476
1477 /*
1478 * we expect i_size = strlen(symname). Copy symname into the file
1479 * data, including the null terminator.
1480 */
1481 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1482 handle_t *handle,
1483 struct inode *inode,
1484 const char *symname)
1485 {
1486 struct buffer_head **bhs = NULL;
1487 const char *c;
1488 struct super_block *sb = osb->sb;
1489 u64 p_blkno;
1490 int p_blocks;
1491 int virtual, blocks, status, i, bytes_left;
1492
1493 bytes_left = i_size_read(inode) + 1;
1494 /* we can't trust i_blocks because we're actually going to
1495 * write i_size + 1 bytes. */
1496 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1497
1498 mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1499 (unsigned long long)inode->i_blocks,
1500 i_size_read(inode), blocks);
1501
1502 /* Sanity check -- make sure we're going to fit. */
1503 if (bytes_left >
1504 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1505 status = -EIO;
1506 mlog_errno(status);
1507 goto bail;
1508 }
1509
1510 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1511 if (!bhs) {
1512 status = -ENOMEM;
1513 mlog_errno(status);
1514 goto bail;
1515 }
1516
1517 status = ocfs2_extent_map_get_blocks(inode, 0, 1, &p_blkno,
1518 &p_blocks);
1519 if (status < 0) {
1520 mlog_errno(status);
1521 goto bail;
1522 }
1523
1524 /* links can never be larger than one cluster so we know this
1525 * is all going to be contiguous, but do a sanity check
1526 * anyway. */
1527 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1528 status = -EIO;
1529 mlog_errno(status);
1530 goto bail;
1531 }
1532
1533 virtual = 0;
1534 while(bytes_left > 0) {
1535 c = &symname[virtual * sb->s_blocksize];
1536
1537 bhs[virtual] = sb_getblk(sb, p_blkno);
1538 if (!bhs[virtual]) {
1539 status = -ENOMEM;
1540 mlog_errno(status);
1541 goto bail;
1542 }
1543 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1544
1545 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1546 OCFS2_JOURNAL_ACCESS_CREATE);
1547 if (status < 0) {
1548 mlog_errno(status);
1549 goto bail;
1550 }
1551
1552 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1553
1554 memcpy(bhs[virtual]->b_data, c,
1555 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1556 bytes_left);
1557
1558 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1559 if (status < 0) {
1560 mlog_errno(status);
1561 goto bail;
1562 }
1563
1564 virtual++;
1565 p_blkno++;
1566 bytes_left -= sb->s_blocksize;
1567 }
1568
1569 status = 0;
1570 bail:
1571
1572 if (bhs) {
1573 for(i = 0; i < blocks; i++)
1574 if (bhs[i])
1575 brelse(bhs[i]);
1576 kfree(bhs);
1577 }
1578
1579 mlog_exit(status);
1580 return status;
1581 }
1582
1583 static int ocfs2_symlink(struct inode *dir,
1584 struct dentry *dentry,
1585 const char *symname)
1586 {
1587 int status, l, credits;
1588 u64 newsize;
1589 struct ocfs2_super *osb = NULL;
1590 struct inode *inode = NULL;
1591 struct super_block *sb;
1592 struct buffer_head *new_fe_bh = NULL;
1593 struct buffer_head *de_bh = NULL;
1594 struct buffer_head *parent_fe_bh = NULL;
1595 struct ocfs2_dinode *fe = NULL;
1596 struct ocfs2_dinode *dirfe;
1597 handle_t *handle = NULL;
1598 struct ocfs2_alloc_context *inode_ac = NULL;
1599 struct ocfs2_alloc_context *data_ac = NULL;
1600
1601 mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1602 dentry, symname, dentry->d_name.len, dentry->d_name.name);
1603
1604 sb = dir->i_sb;
1605 osb = OCFS2_SB(sb);
1606
1607 l = strlen(symname) + 1;
1608
1609 credits = ocfs2_calc_symlink_credits(sb);
1610
1611 /* lock the parent directory */
1612 status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
1613 if (status < 0) {
1614 if (status != -ENOENT)
1615 mlog_errno(status);
1616 return status;
1617 }
1618
1619 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1620 if (!dirfe->i_links_count) {
1621 /* can't make a file in a deleted directory. */
1622 status = -ENOENT;
1623 goto bail;
1624 }
1625
1626 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1627 dentry->d_name.len);
1628 if (status)
1629 goto bail;
1630
1631 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1632 dentry->d_name.name,
1633 dentry->d_name.len, &de_bh);
1634 if (status < 0) {
1635 mlog_errno(status);
1636 goto bail;
1637 }
1638
1639 status = ocfs2_reserve_new_inode(osb, &inode_ac);
1640 if (status < 0) {
1641 if (status != -ENOSPC)
1642 mlog_errno(status);
1643 goto bail;
1644 }
1645
1646 /* don't reserve bitmap space for fast symlinks. */
1647 if (l > ocfs2_fast_symlink_chars(sb)) {
1648 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
1649 if (status < 0) {
1650 if (status != -ENOSPC)
1651 mlog_errno(status);
1652 goto bail;
1653 }
1654 }
1655
1656 handle = ocfs2_start_trans(osb, credits);
1657 if (IS_ERR(handle)) {
1658 status = PTR_ERR(handle);
1659 handle = NULL;
1660 mlog_errno(status);
1661 goto bail;
1662 }
1663
1664 status = ocfs2_mknod_locked(osb, dir, dentry,
1665 S_IFLNK | S_IRWXUGO, 0,
1666 &new_fe_bh, parent_fe_bh, handle,
1667 &inode, inode_ac);
1668 if (status < 0) {
1669 mlog_errno(status);
1670 goto bail;
1671 }
1672
1673 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1674 inode->i_rdev = 0;
1675 newsize = l - 1;
1676 if (l > ocfs2_fast_symlink_chars(sb)) {
1677 inode->i_op = &ocfs2_symlink_inode_operations;
1678 status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh,
1679 handle, data_ac, NULL,
1680 NULL);
1681 if (status < 0) {
1682 if (status != -ENOSPC && status != -EINTR) {
1683 mlog(ML_ERROR,
1684 "Failed to extend file to %llu\n",
1685 (unsigned long long)newsize);
1686 mlog_errno(status);
1687 status = -ENOSPC;
1688 }
1689 goto bail;
1690 }
1691 i_size_write(inode, newsize);
1692 inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize);
1693 } else {
1694 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1695 memcpy((char *) fe->id2.i_symlink, symname, l);
1696 i_size_write(inode, newsize);
1697 inode->i_blocks = 0;
1698 }
1699
1700 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1701 if (status < 0) {
1702 mlog_errno(status);
1703 goto bail;
1704 }
1705
1706 if (!ocfs2_inode_is_fast_symlink(inode)) {
1707 status = ocfs2_create_symlink_data(osb, handle, inode,
1708 symname);
1709 if (status < 0) {
1710 mlog_errno(status);
1711 goto bail;
1712 }
1713 }
1714
1715 status = ocfs2_add_entry(handle, dentry, inode,
1716 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1717 de_bh);
1718 if (status < 0) {
1719 mlog_errno(status);
1720 goto bail;
1721 }
1722
1723 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1724 if (status) {
1725 mlog_errno(status);
1726 goto bail;
1727 }
1728
1729 insert_inode_hash(inode);
1730 dentry->d_op = &ocfs2_dentry_ops;
1731 d_instantiate(dentry, inode);
1732 bail:
1733 if (handle)
1734 ocfs2_commit_trans(osb, handle);
1735
1736 ocfs2_meta_unlock(dir, 1);
1737
1738 if (new_fe_bh)
1739 brelse(new_fe_bh);
1740 if (parent_fe_bh)
1741 brelse(parent_fe_bh);
1742 if (de_bh)
1743 brelse(de_bh);
1744 if (inode_ac)
1745 ocfs2_free_alloc_context(inode_ac);
1746 if (data_ac)
1747 ocfs2_free_alloc_context(data_ac);
1748 if ((status < 0) && inode)
1749 iput(inode);
1750
1751 mlog_exit(status);
1752
1753 return status;
1754 }
1755
1756 int ocfs2_check_dir_entry(struct inode * dir,
1757 struct ocfs2_dir_entry * de,
1758 struct buffer_head * bh,
1759 unsigned long offset)
1760 {
1761 const char *error_msg = NULL;
1762 const int rlen = le16_to_cpu(de->rec_len);
1763
1764 if (rlen < OCFS2_DIR_REC_LEN(1))
1765 error_msg = "rec_len is smaller than minimal";
1766 else if (rlen % 4 != 0)
1767 error_msg = "rec_len % 4 != 0";
1768 else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
1769 error_msg = "rec_len is too small for name_len";
1770 else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
1771 error_msg = "directory entry across blocks";
1772
1773 if (error_msg != NULL)
1774 mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
1775 "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
1776 (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
1777 offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
1778 de->name_len);
1779 return error_msg == NULL ? 1 : 0;
1780 }
1781
1782 /* we don't always have a dentry for what we want to add, so people
1783 * like orphan dir can call this instead.
1784 *
1785 * If you pass me insert_bh, I'll skip the search of the other dir
1786 * blocks and put the record in there.
1787 */
1788 static int __ocfs2_add_entry(handle_t *handle,
1789 struct inode *dir,
1790 const char *name, int namelen,
1791 struct inode *inode, u64 blkno,
1792 struct buffer_head *parent_fe_bh,
1793 struct buffer_head *insert_bh)
1794 {
1795 unsigned long offset;
1796 unsigned short rec_len;
1797 struct ocfs2_dir_entry *de, *de1;
1798 struct super_block *sb;
1799 int retval, status;
1800
1801 mlog_entry_void();
1802
1803 sb = dir->i_sb;
1804
1805 if (!namelen)
1806 return -EINVAL;
1807
1808 rec_len = OCFS2_DIR_REC_LEN(namelen);
1809 offset = 0;
1810 de = (struct ocfs2_dir_entry *) insert_bh->b_data;
1811 while (1) {
1812 BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data);
1813 /* These checks should've already been passed by the
1814 * prepare function, but I guess we can leave them
1815 * here anyway. */
1816 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
1817 retval = -ENOENT;
1818 goto bail;
1819 }
1820 if (ocfs2_match(namelen, name, de)) {
1821 retval = -EEXIST;
1822 goto bail;
1823 }
1824 if (((le64_to_cpu(de->inode) == 0) &&
1825 (le16_to_cpu(de->rec_len) >= rec_len)) ||
1826 (le16_to_cpu(de->rec_len) >=
1827 (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
1828 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
1829 retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
1830 if (retval < 0) {
1831 mlog_errno(retval);
1832 goto bail;
1833 }
1834
1835 status = ocfs2_journal_access(handle, dir, insert_bh,
1836 OCFS2_JOURNAL_ACCESS_WRITE);
1837 /* By now the buffer is marked for journaling */
1838 offset += le16_to_cpu(de->rec_len);
1839 if (le64_to_cpu(de->inode)) {
1840 de1 = (struct ocfs2_dir_entry *)((char *) de +
1841 OCFS2_DIR_REC_LEN(de->name_len));
1842 de1->rec_len =
1843 cpu_to_le16(le16_to_cpu(de->rec_len) -
1844 OCFS2_DIR_REC_LEN(de->name_len));
1845 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
1846 de = de1;
1847 }
1848 de->file_type = OCFS2_FT_UNKNOWN;
1849 if (blkno) {
1850 de->inode = cpu_to_le64(blkno);
1851 ocfs2_set_de_type(de, inode->i_mode);
1852 } else
1853 de->inode = 0;
1854 de->name_len = namelen;
1855 memcpy(de->name, name, namelen);
1856
1857 dir->i_version++;
1858 status = ocfs2_journal_dirty(handle, insert_bh);
1859 retval = 0;
1860 goto bail;
1861 }
1862 offset += le16_to_cpu(de->rec_len);
1863 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
1864 }
1865
1866 /* when you think about it, the assert above should prevent us
1867 * from ever getting here. */
1868 retval = -ENOSPC;
1869 bail:
1870
1871 mlog_exit(retval);
1872 return retval;
1873 }
1874
1875
1876 /*
1877 * ocfs2_delete_entry deletes a directory entry by merging it with the
1878 * previous entry
1879 */
1880 static int ocfs2_delete_entry(handle_t *handle,
1881 struct inode *dir,
1882 struct ocfs2_dir_entry *de_del,
1883 struct buffer_head *bh)
1884 {
1885 struct ocfs2_dir_entry *de, *pde;
1886 int i, status = -ENOENT;
1887
1888 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
1889
1890 i = 0;
1891 pde = NULL;
1892 de = (struct ocfs2_dir_entry *) bh->b_data;
1893 while (i < bh->b_size) {
1894 if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
1895 status = -EIO;
1896 mlog_errno(status);
1897 goto bail;
1898 }
1899 if (de == de_del) {
1900 status = ocfs2_journal_access(handle, dir, bh,
1901 OCFS2_JOURNAL_ACCESS_WRITE);
1902 if (status < 0) {
1903 status = -EIO;
1904 mlog_errno(status);
1905 goto bail;
1906 }
1907 if (pde)
1908 pde->rec_len =
1909 cpu_to_le16(le16_to_cpu(pde->rec_len) +
1910 le16_to_cpu(de->rec_len));
1911 else
1912 de->inode = 0;
1913 dir->i_version++;
1914 status = ocfs2_journal_dirty(handle, bh);
1915 goto bail;
1916 }
1917 i += le16_to_cpu(de->rec_len);
1918 pde = de;
1919 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
1920 }
1921 bail:
1922 mlog_exit(status);
1923 return status;
1924 }
1925
1926 /*
1927 * Returns 0 if not found, -1 on failure, and 1 on success
1928 */
1929 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
1930 struct inode *dir,
1931 const char *name, int namelen,
1932 unsigned long offset,
1933 struct ocfs2_dir_entry **res_dir)
1934 {
1935 struct ocfs2_dir_entry *de;
1936 char *dlimit, *de_buf;
1937 int de_len;
1938 int ret = 0;
1939
1940 mlog_entry_void();
1941
1942 de_buf = bh->b_data;
1943 dlimit = de_buf + dir->i_sb->s_blocksize;
1944
1945 while (de_buf < dlimit) {
1946 /* this code is executed quadratically often */
1947 /* do minimal checking `by hand' */
1948
1949 de = (struct ocfs2_dir_entry *) de_buf;
1950
1951 if (de_buf + namelen <= dlimit &&
1952 ocfs2_match(namelen, name, de)) {
1953 /* found a match - just to be sure, do a full check */
1954 if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
1955 ret = -1;
1956 goto bail;
1957 }
1958 *res_dir = de;
1959 ret = 1;
1960 goto bail;
1961 }
1962
1963 /* prevent looping on a bad block */
1964 de_len = le16_to_cpu(de->rec_len);
1965 if (de_len <= 0) {
1966 ret = -1;
1967 goto bail;
1968 }
1969
1970 de_buf += de_len;
1971 offset += de_len;
1972 }
1973
1974 bail:
1975 mlog_exit(ret);
1976 return ret;
1977 }
1978
1979 struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
1980 struct inode *dir,
1981 struct ocfs2_dir_entry **res_dir)
1982 {
1983 struct super_block *sb;
1984 struct buffer_head *bh_use[NAMEI_RA_SIZE];
1985 struct buffer_head *bh, *ret = NULL;
1986 unsigned long start, block, b;
1987 int ra_max = 0; /* Number of bh's in the readahead
1988 buffer, bh_use[] */
1989 int ra_ptr = 0; /* Current index into readahead
1990 buffer */
1991 int num = 0;
1992 int nblocks, i, err;
1993
1994 mlog_entry_void();
1995
1996 *res_dir = NULL;
1997 sb = dir->i_sb;
1998
1999 nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2000 start = OCFS2_I(dir)->ip_dir_start_lookup;
2001 if (start >= nblocks)
2002 start = 0;
2003 block = start;
2004
2005 restart:
2006 do {
2007 /*
2008 * We deal with the read-ahead logic here.
2009 */
2010 if (ra_ptr >= ra_max) {
2011 /* Refill the readahead buffer */
2012 ra_ptr = 0;
2013 b = block;
2014 for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
2015 /*
2016 * Terminate if we reach the end of the
2017 * directory and must wrap, or if our
2018 * search has finished at this block.
2019 */
2020 if (b >= nblocks || (num && block == start)) {
2021 bh_use[ra_max] = NULL;
2022 break;
2023 }
2024 num++;
2025
2026 bh = ocfs2_bread(dir, b++, &err, 1);
2027 bh_use[ra_max] = bh;
2028 }
2029 }
2030 if ((bh = bh_use[ra_ptr++]) == NULL)
2031 goto next;
2032 wait_on_buffer(bh);
2033 if (!buffer_uptodate(bh)) {
2034 /* read error, skip block & hope for the best */
2035 ocfs2_error(dir->i_sb, "reading directory %llu, "
2036 "offset %lu\n",
2037 (unsigned long long)OCFS2_I(dir)->ip_blkno,
2038 block);
2039 brelse(bh);
2040 goto next;
2041 }
2042 i = ocfs2_search_dirblock(bh, dir, name, namelen,
2043 block << sb->s_blocksize_bits,
2044 res_dir);
2045 if (i == 1) {
2046 OCFS2_I(dir)->ip_dir_start_lookup = block;
2047 ret = bh;
2048 goto cleanup_and_exit;
2049 } else {
2050 brelse(bh);
2051 if (i < 0)
2052 goto cleanup_and_exit;
2053 }
2054 next:
2055 if (++block >= nblocks)
2056 block = 0;
2057 } while (block != start);
2058
2059 /*
2060 * If the directory has grown while we were searching, then
2061 * search the last part of the directory before giving up.
2062 */
2063 block = nblocks;
2064 nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2065 if (block < nblocks) {
2066 start = 0;
2067 goto restart;
2068 }
2069
2070 cleanup_and_exit:
2071 /* Clean up the read-ahead blocks */
2072 for (; ra_ptr < ra_max; ra_ptr++)
2073 brelse(bh_use[ra_ptr]);
2074
2075 mlog_exit_ptr(ret);
2076 return ret;
2077 }
2078
2079 static int ocfs2_blkno_stringify(u64 blkno, char *name)
2080 {
2081 int status, namelen;
2082
2083 mlog_entry_void();
2084
2085 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
2086 (long long)blkno);
2087 if (namelen <= 0) {
2088 if (namelen)
2089 status = namelen;
2090 else
2091 status = -EINVAL;
2092 mlog_errno(status);
2093 goto bail;
2094 }
2095 if (namelen != OCFS2_ORPHAN_NAMELEN) {
2096 status = -EINVAL;
2097 mlog_errno(status);
2098 goto bail;
2099 }
2100
2101 mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
2102 namelen);
2103
2104 status = 0;
2105 bail:
2106 mlog_exit(status);
2107 return status;
2108 }
2109
2110 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2111 struct inode **ret_orphan_dir,
2112 struct inode *inode,
2113 char *name,
2114 struct buffer_head **de_bh)
2115 {
2116 struct inode *orphan_dir_inode;
2117 struct buffer_head *orphan_dir_bh = NULL;
2118 int status = 0;
2119
2120 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2121 if (status < 0) {
2122 mlog_errno(status);
2123 return status;
2124 }
2125
2126 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2127 ORPHAN_DIR_SYSTEM_INODE,
2128 osb->slot_num);
2129 if (!orphan_dir_inode) {
2130 status = -ENOENT;
2131 mlog_errno(status);
2132 return status;
2133 }
2134
2135 mutex_lock(&orphan_dir_inode->i_mutex);
2136
2137 status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2138 if (status < 0) {
2139 mlog_errno(status);
2140 goto leave;
2141 }
2142
2143 status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2144 orphan_dir_bh, name,
2145 OCFS2_ORPHAN_NAMELEN, de_bh);
2146 if (status < 0) {
2147 ocfs2_meta_unlock(orphan_dir_inode, 1);
2148
2149 mlog_errno(status);
2150 goto leave;
2151 }
2152
2153 *ret_orphan_dir = orphan_dir_inode;
2154
2155 leave:
2156 if (status) {
2157 mutex_unlock(&orphan_dir_inode->i_mutex);
2158 iput(orphan_dir_inode);
2159 }
2160
2161 if (orphan_dir_bh)
2162 brelse(orphan_dir_bh);
2163
2164 mlog_exit(status);
2165 return status;
2166 }
2167
2168 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2169 handle_t *handle,
2170 struct inode *inode,
2171 struct ocfs2_dinode *fe,
2172 char *name,
2173 struct buffer_head *de_bh,
2174 struct inode *orphan_dir_inode)
2175 {
2176 struct buffer_head *orphan_dir_bh = NULL;
2177 int status = 0;
2178 struct ocfs2_dinode *orphan_fe;
2179
2180 mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
2181
2182 status = ocfs2_read_block(osb,
2183 OCFS2_I(orphan_dir_inode)->ip_blkno,
2184 &orphan_dir_bh, OCFS2_BH_CACHED,
2185 orphan_dir_inode);
2186 if (status < 0) {
2187 mlog_errno(status);
2188 goto leave;
2189 }
2190
2191 status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
2192 OCFS2_JOURNAL_ACCESS_WRITE);
2193 if (status < 0) {
2194 mlog_errno(status);
2195 goto leave;
2196 }
2197
2198 /* we're a cluster, and nlink can change on disk from
2199 * underneath us... */
2200 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2201 if (S_ISDIR(inode->i_mode))
2202 le16_add_cpu(&orphan_fe->i_links_count, 1);
2203 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2204
2205 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2206 if (status < 0) {
2207 mlog_errno(status);
2208 goto leave;
2209 }
2210
2211 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2212 OCFS2_ORPHAN_NAMELEN, inode,
2213 OCFS2_I(inode)->ip_blkno,
2214 orphan_dir_bh, de_bh);
2215 if (status < 0) {
2216 mlog_errno(status);
2217 goto leave;
2218 }
2219
2220 le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2221
2222 /* Record which orphan dir our inode now resides
2223 * in. delete_inode will use this to determine which orphan
2224 * dir to lock. */
2225 spin_lock(&OCFS2_I(inode)->ip_lock);
2226 OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num;
2227 spin_unlock(&OCFS2_I(inode)->ip_lock);
2228
2229 mlog(0, "Inode %llu orphaned in slot %d\n",
2230 (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
2231
2232 leave:
2233 if (orphan_dir_bh)
2234 brelse(orphan_dir_bh);
2235
2236 mlog_exit(status);
2237 return status;
2238 }
2239
2240 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2241 int ocfs2_orphan_del(struct ocfs2_super *osb,
2242 handle_t *handle,
2243 struct inode *orphan_dir_inode,
2244 struct inode *inode,
2245 struct buffer_head *orphan_dir_bh)
2246 {
2247 char name[OCFS2_ORPHAN_NAMELEN + 1];
2248 struct ocfs2_dinode *orphan_fe;
2249 int status = 0;
2250 struct buffer_head *target_de_bh = NULL;
2251 struct ocfs2_dir_entry *target_de = NULL;
2252
2253 mlog_entry_void();
2254
2255 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2256 if (status < 0) {
2257 mlog_errno(status);
2258 goto leave;
2259 }
2260
2261 mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
2262 name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2263 OCFS2_ORPHAN_NAMELEN);
2264
2265 /* find it's spot in the orphan directory */
2266 target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
2267 orphan_dir_inode, &target_de);
2268 if (!target_de_bh) {
2269 status = -ENOENT;
2270 mlog_errno(status);
2271 goto leave;
2272 }
2273
2274 /* remove it from the orphan directory */
2275 status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
2276 target_de_bh);
2277 if (status < 0) {
2278 mlog_errno(status);
2279 goto leave;
2280 }
2281
2282 status = ocfs2_journal_access(handle,orphan_dir_inode, orphan_dir_bh,
2283 OCFS2_JOURNAL_ACCESS_WRITE);
2284 if (status < 0) {
2285 mlog_errno(status);
2286 goto leave;
2287 }
2288
2289 /* do the i_nlink dance! :) */
2290 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2291 if (S_ISDIR(inode->i_mode))
2292 le16_add_cpu(&orphan_fe->i_links_count, -1);
2293 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2294
2295 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2296 if (status < 0) {
2297 mlog_errno(status);
2298 goto leave;
2299 }
2300
2301 leave:
2302 if (target_de_bh)
2303 brelse(target_de_bh);
2304
2305 mlog_exit(status);
2306 return status;
2307 }
2308
2309 struct inode_operations ocfs2_dir_iops = {
2310 .create = ocfs2_create,
2311 .lookup = ocfs2_lookup,
2312 .link = ocfs2_link,
2313 .unlink = ocfs2_unlink,
2314 .rmdir = ocfs2_unlink,
2315 .symlink = ocfs2_symlink,
2316 .mkdir = ocfs2_mkdir,
2317 .mknod = ocfs2_mknod,
2318 .rename = ocfs2_rename,
2319 .setattr = ocfs2_setattr,
2320 .getattr = ocfs2_getattr,
2321 .permission = ocfs2_permission,
2322 };
(deprecated) Btrfs devel tree