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ixgb: update version, dates
[linux-2.6/suspend2-2.6.18.git] / fs / ocfs2 / namei.c
blob0673862c8bdd24178f438f58840a06eec014b970
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 "symlink.h"
60 #include "sysfile.h"
61 #include "uptodate.h"
62 #include "vote.h"
63
64 #include "buffer_head_io.h"
65
66 #define NAMEI_RA_CHUNKS 2
67 #define NAMEI_RA_BLOCKS 4
68 #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
69 #define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
70
71 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
72 struct inode *dir,
73 const char *name, int namelen,
74 unsigned long offset,
75 struct ocfs2_dir_entry **res_dir);
76
77 static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle,
78 struct inode *dir,
79 struct ocfs2_dir_entry *de_del,
80 struct buffer_head *bh);
81
82 static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle,
83 struct inode *dir,
84 const char *name, int namelen,
85 struct inode *inode, u64 blkno,
86 struct buffer_head *parent_fe_bh,
87 struct buffer_head *insert_bh);
88
89 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
90 struct inode *dir,
91 struct dentry *dentry, int mode,
92 dev_t dev,
93 struct buffer_head **new_fe_bh,
94 struct buffer_head *parent_fe_bh,
95 struct ocfs2_journal_handle *handle,
96 struct inode **ret_inode,
97 struct ocfs2_alloc_context *inode_ac);
98
99 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
100 struct ocfs2_journal_handle *handle,
101 struct inode *parent,
102 struct inode *inode,
103 struct buffer_head *fe_bh,
104 struct ocfs2_alloc_context *data_ac);
105
106 static int ocfs2_double_lock(struct ocfs2_super *osb,
107 struct ocfs2_journal_handle *handle,
108 struct buffer_head **bh1,
109 struct inode *inode1,
110 struct buffer_head **bh2,
111 struct inode *inode2);
112
113 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
114 struct ocfs2_journal_handle *handle,
115 struct inode *inode,
116 char *name,
117 struct buffer_head **de_bh);
118
119 static int ocfs2_orphan_add(struct ocfs2_super *osb,
120 struct ocfs2_journal_handle *handle,
121 struct inode *inode,
122 struct ocfs2_dinode *fe,
123 char *name,
124 struct buffer_head *de_bh);
125
126 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
127 struct ocfs2_journal_handle *handle,
128 struct inode *inode,
129 const char *symname);
130
131 static inline int ocfs2_add_entry(struct ocfs2_journal_handle *handle,
132 struct dentry *dentry,
133 struct inode *inode, u64 blkno,
134 struct buffer_head *parent_fe_bh,
135 struct buffer_head *insert_bh)
136 {
137 return __ocfs2_add_entry(handle, dentry->d_parent->d_inode,
138 dentry->d_name.name, dentry->d_name.len,
139 inode, blkno, parent_fe_bh, insert_bh);
140 }
141
142 /* An orphan dir name is an 8 byte value, printed as a hex string */
143 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
144
145 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
146 struct nameidata *nd)
147 {
148 int status;
149 u64 blkno;
150 struct buffer_head *dirent_bh = NULL;
151 struct inode *inode = NULL;
152 struct dentry *ret;
153 struct ocfs2_dir_entry *dirent;
154 struct ocfs2_inode_info *oi;
155
156 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
157 dentry->d_name.len, dentry->d_name.name);
158
159 if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
160 ret = ERR_PTR(-ENAMETOOLONG);
161 goto bail;
162 }
163
164 mlog(0, "find name %.*s in directory %llu\n", dentry->d_name.len,
165 dentry->d_name.name, (unsigned long long)OCFS2_I(dir)->ip_blkno);
166
167 status = ocfs2_meta_lock(dir, NULL, NULL, 0);
168 if (status < 0) {
169 if (status != -ENOENT)
170 mlog_errno(status);
171 ret = ERR_PTR(status);
172 goto bail;
173 }
174
175 status = ocfs2_find_files_on_disk(dentry->d_name.name,
176 dentry->d_name.len, &blkno,
177 dir, &dirent_bh, &dirent);
178 if (status < 0)
179 goto bail_add;
180
181 inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno);
182 if (IS_ERR(inode)) {
183 mlog(ML_ERROR, "Unable to create inode %llu\n",
184 (unsigned long long)blkno);
185 ret = ERR_PTR(-EACCES);
186 goto bail_unlock;
187 }
188
189 oi = OCFS2_I(inode);
190 /* Clear any orphaned state... If we were able to look up the
191 * inode from a directory, it certainly can't be orphaned. We
192 * might have the bad state from a node which intended to
193 * orphan this inode but crashed before it could commit the
194 * unlink. */
195 spin_lock(&oi->ip_lock);
196 oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
197 oi->ip_orphaned_slot = OCFS2_INVALID_SLOT;
198 spin_unlock(&oi->ip_lock);
199
200 bail_add:
201
202 dentry->d_op = &ocfs2_dentry_ops;
203 ret = d_splice_alias(inode, dentry);
204
205 bail_unlock:
206 /* Don't drop the cluster lock until *after* the d_add --
207 * unlink on another node will message us to remove that
208 * dentry under this lock so otherwise we can race this with
209 * the vote thread and have a stale dentry. */
210 ocfs2_meta_unlock(dir, 0);
211
212 bail:
213 if (dirent_bh)
214 brelse(dirent_bh);
215
216 mlog_exit_ptr(ret);
217
218 return ret;
219 }
220
221 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
222 struct ocfs2_journal_handle *handle,
223 struct inode *parent,
224 struct inode *inode,
225 struct buffer_head *fe_bh,
226 struct ocfs2_alloc_context *data_ac)
227 {
228 int status;
229 struct buffer_head *new_bh = NULL;
230 struct ocfs2_dir_entry *de = NULL;
231
232 mlog_entry_void();
233
234 status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
235 data_ac, NULL, &new_bh);
236 if (status < 0) {
237 mlog_errno(status);
238 goto bail;
239 }
240
241 ocfs2_set_new_buffer_uptodate(inode, new_bh);
242
243 status = ocfs2_journal_access(handle, inode, new_bh,
244 OCFS2_JOURNAL_ACCESS_CREATE);
245 if (status < 0) {
246 mlog_errno(status);
247 goto bail;
248 }
249 memset(new_bh->b_data, 0, osb->sb->s_blocksize);
250
251 de = (struct ocfs2_dir_entry *) new_bh->b_data;
252 de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
253 de->name_len = 1;
254 de->rec_len =
255 cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
256 strcpy(de->name, ".");
257 ocfs2_set_de_type(de, S_IFDIR);
258 de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
259 de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
260 de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize -
261 OCFS2_DIR_REC_LEN(1));
262 de->name_len = 2;
263 strcpy(de->name, "..");
264 ocfs2_set_de_type(de, S_IFDIR);
265
266 status = ocfs2_journal_dirty(handle, new_bh);
267 if (status < 0) {
268 mlog_errno(status);
269 goto bail;
270 }
271
272 i_size_write(inode, inode->i_sb->s_blocksize);
273 inode->i_nlink = 2;
274 inode->i_blocks = ocfs2_align_bytes_to_sectors(inode->i_sb->s_blocksize);
275 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
276 if (status < 0) {
277 mlog_errno(status);
278 goto bail;
279 }
280
281 status = 0;
282 bail:
283 if (new_bh)
284 brelse(new_bh);
285
286 mlog_exit(status);
287 return status;
288 }
289
290 static int ocfs2_mknod(struct inode *dir,
291 struct dentry *dentry,
292 int mode,
293 dev_t dev)
294 {
295 int status = 0;
296 struct buffer_head *parent_fe_bh = NULL;
297 struct ocfs2_journal_handle *handle = NULL;
298 struct ocfs2_super *osb;
299 struct ocfs2_dinode *dirfe;
300 struct buffer_head *new_fe_bh = NULL;
301 struct buffer_head *de_bh = NULL;
302 struct inode *inode = NULL;
303 struct ocfs2_alloc_context *inode_ac = NULL;
304 struct ocfs2_alloc_context *data_ac = NULL;
305
306 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
307 (unsigned long)dev, dentry->d_name.len,
308 dentry->d_name.name);
309
310 /* get our super block */
311 osb = OCFS2_SB(dir->i_sb);
312
313 if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
314 mlog(ML_ERROR, "inode %llu has i_nlink of %u\n",
315 (unsigned long long)OCFS2_I(dir)->ip_blkno, dir->i_nlink);
316 status = -EMLINK;
317 goto leave;
318 }
319
320 handle = ocfs2_alloc_handle(osb);
321 if (handle == NULL) {
322 status = -ENOMEM;
323 mlog_errno(status);
324 goto leave;
325 }
326
327 status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
328 if (status < 0) {
329 if (status != -ENOENT)
330 mlog_errno(status);
331 goto leave;
332 }
333
334 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
335 if (!dirfe->i_links_count) {
336 /* can't make a file in a deleted directory. */
337 status = -ENOENT;
338 goto leave;
339 }
340
341 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
342 dentry->d_name.len);
343 if (status)
344 goto leave;
345
346 /* get a spot inside the dir. */
347 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
348 dentry->d_name.name,
349 dentry->d_name.len, &de_bh);
350 if (status < 0) {
351 mlog_errno(status);
352 goto leave;
353 }
354
355 /* reserve an inode spot */
356 status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
357 if (status < 0) {
358 if (status != -ENOSPC)
359 mlog_errno(status);
360 goto leave;
361 }
362
363 /* are we making a directory? If so, reserve a cluster for his
364 * 1st extent. */
365 if (S_ISDIR(mode)) {
366 status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
367 if (status < 0) {
368 if (status != -ENOSPC)
369 mlog_errno(status);
370 goto leave;
371 }
372 }
373
374 handle = ocfs2_start_trans(osb, handle, OCFS2_MKNOD_CREDITS);
375 if (IS_ERR(handle)) {
376 status = PTR_ERR(handle);
377 handle = NULL;
378 mlog_errno(status);
379 goto leave;
380 }
381
382 /* do the real work now. */
383 status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
384 &new_fe_bh, parent_fe_bh, handle,
385 &inode, inode_ac);
386 if (status < 0) {
387 mlog_errno(status);
388 goto leave;
389 }
390
391 if (S_ISDIR(mode)) {
392 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
393 new_fe_bh, data_ac);
394 if (status < 0) {
395 mlog_errno(status);
396 goto leave;
397 }
398
399 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
400 OCFS2_JOURNAL_ACCESS_WRITE);
401 if (status < 0) {
402 mlog_errno(status);
403 goto leave;
404 }
405 le16_add_cpu(&dirfe->i_links_count, 1);
406 status = ocfs2_journal_dirty(handle, parent_fe_bh);
407 if (status < 0) {
408 mlog_errno(status);
409 goto leave;
410 }
411 dir->i_nlink++;
412 }
413
414 status = ocfs2_add_entry(handle, dentry, inode,
415 OCFS2_I(inode)->ip_blkno, parent_fe_bh,
416 de_bh);
417 if (status < 0) {
418 mlog_errno(status);
419 goto leave;
420 }
421
422 insert_inode_hash(inode);
423 dentry->d_op = &ocfs2_dentry_ops;
424 d_instantiate(dentry, inode);
425 status = 0;
426 leave:
427 if (handle)
428 ocfs2_commit_trans(handle);
429
430 if (status == -ENOSPC)
431 mlog(0, "Disk is full\n");
432
433 if (new_fe_bh)
434 brelse(new_fe_bh);
435
436 if (de_bh)
437 brelse(de_bh);
438
439 if (parent_fe_bh)
440 brelse(parent_fe_bh);
441
442 if ((status < 0) && inode)
443 iput(inode);
444
445 if (inode_ac)
446 ocfs2_free_alloc_context(inode_ac);
447
448 if (data_ac)
449 ocfs2_free_alloc_context(data_ac);
450
451 mlog_exit(status);
452
453 return status;
454 }
455
456 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
457 struct inode *dir,
458 struct dentry *dentry, int mode,
459 dev_t dev,
460 struct buffer_head **new_fe_bh,
461 struct buffer_head *parent_fe_bh,
462 struct ocfs2_journal_handle *handle,
463 struct inode **ret_inode,
464 struct ocfs2_alloc_context *inode_ac)
465 {
466 int status = 0;
467 struct ocfs2_dinode *fe = NULL;
468 struct ocfs2_extent_list *fel;
469 u64 fe_blkno = 0;
470 u16 suballoc_bit;
471 struct inode *inode = NULL;
472
473 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
474 (unsigned long)dev, dentry->d_name.len,
475 dentry->d_name.name);
476
477 *new_fe_bh = NULL;
478 *ret_inode = NULL;
479
480 status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
481 &fe_blkno);
482 if (status < 0) {
483 mlog_errno(status);
484 goto leave;
485 }
486
487 inode = new_inode(dir->i_sb);
488 if (IS_ERR(inode)) {
489 status = PTR_ERR(inode);
490 mlog(ML_ERROR, "new_inode failed!\n");
491 goto leave;
492 }
493
494 /* populate as many fields early on as possible - many of
495 * these are used by the support functions here and in
496 * callers. */
497 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
498 OCFS2_I(inode)->ip_blkno = fe_blkno;
499 if (S_ISDIR(mode))
500 inode->i_nlink = 2;
501 else
502 inode->i_nlink = 1;
503 inode->i_mode = mode;
504 spin_lock(&osb->osb_lock);
505 inode->i_generation = osb->s_next_generation++;
506 spin_unlock(&osb->osb_lock);
507
508 *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
509 if (!*new_fe_bh) {
510 status = -EIO;
511 mlog_errno(status);
512 goto leave;
513 }
514 ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
515
516 status = ocfs2_journal_access(handle, inode, *new_fe_bh,
517 OCFS2_JOURNAL_ACCESS_CREATE);
518 if (status < 0) {
519 mlog_errno(status);
520 goto leave;
521 }
522
523 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
524 memset(fe, 0, osb->sb->s_blocksize);
525
526 fe->i_generation = cpu_to_le32(inode->i_generation);
527 fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
528 fe->i_blkno = cpu_to_le64(fe_blkno);
529 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
530 fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
531 fe->i_uid = cpu_to_le32(current->fsuid);
532 if (dir->i_mode & S_ISGID) {
533 fe->i_gid = cpu_to_le32(dir->i_gid);
534 if (S_ISDIR(mode))
535 mode |= S_ISGID;
536 } else
537 fe->i_gid = cpu_to_le32(current->fsgid);
538 fe->i_mode = cpu_to_le16(mode);
539 if (S_ISCHR(mode) || S_ISBLK(mode))
540 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
541
542 fe->i_links_count = cpu_to_le16(inode->i_nlink);
543
544 fe->i_last_eb_blk = 0;
545 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
546 le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
547 fe->i_atime = fe->i_ctime = fe->i_mtime =
548 cpu_to_le64(CURRENT_TIME.tv_sec);
549 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
550 cpu_to_le32(CURRENT_TIME.tv_nsec);
551 fe->i_dtime = 0;
552
553 fel = &fe->id2.i_list;
554 fel->l_tree_depth = 0;
555 fel->l_next_free_rec = 0;
556 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
557
558 status = ocfs2_journal_dirty(handle, *new_fe_bh);
559 if (status < 0) {
560 mlog_errno(status);
561 goto leave;
562 }
563
564 if (ocfs2_populate_inode(inode, fe, 1) < 0) {
565 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
566 "i_blkno=%llu, i_ino=%lu\n",
567 (unsigned long long) (*new_fe_bh)->b_blocknr,
568 (unsigned long long)fe->i_blkno, inode->i_ino);
569 BUG();
570 }
571
572 ocfs2_inode_set_new(osb, inode);
573 status = ocfs2_create_new_inode_locks(inode);
574 if (status < 0)
575 mlog_errno(status);
576
577 status = 0; /* error in ocfs2_create_new_inode_locks is not
578 * critical */
579
580 *ret_inode = inode;
581 leave:
582 if (status < 0) {
583 if (*new_fe_bh) {
584 brelse(*new_fe_bh);
585 *new_fe_bh = NULL;
586 }
587 if (inode)
588 iput(inode);
589 }
590
591 mlog_exit(status);
592 return status;
593 }
594
595 static int ocfs2_mkdir(struct inode *dir,
596 struct dentry *dentry,
597 int mode)
598 {
599 int ret;
600
601 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
602 dentry->d_name.len, dentry->d_name.name);
603 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
604 mlog_exit(ret);
605
606 return ret;
607 }
608
609 static int ocfs2_create(struct inode *dir,
610 struct dentry *dentry,
611 int mode,
612 struct nameidata *nd)
613 {
614 int ret;
615
616 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
617 dentry->d_name.len, dentry->d_name.name);
618 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
619 mlog_exit(ret);
620
621 return ret;
622 }
623
624 static int ocfs2_link(struct dentry *old_dentry,
625 struct inode *dir,
626 struct dentry *dentry)
627 {
628 struct ocfs2_journal_handle *handle = NULL;
629 struct inode *inode = old_dentry->d_inode;
630 int err;
631 struct buffer_head *fe_bh = NULL;
632 struct buffer_head *parent_fe_bh = NULL;
633 struct buffer_head *de_bh = NULL;
634 struct ocfs2_dinode *fe = NULL;
635 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
636
637 mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
638 old_dentry->d_name.len, old_dentry->d_name.name,
639 dentry->d_name.len, dentry->d_name.name);
640
641 if (S_ISDIR(inode->i_mode)) {
642 err = -EPERM;
643 goto bail;
644 }
645
646 if (inode->i_nlink >= OCFS2_LINK_MAX) {
647 err = -EMLINK;
648 goto bail;
649 }
650
651 handle = ocfs2_alloc_handle(osb);
652 if (handle == NULL) {
653 err = -ENOMEM;
654 goto bail;
655 }
656
657 err = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
658 if (err < 0) {
659 if (err != -ENOENT)
660 mlog_errno(err);
661 goto bail;
662 }
663
664 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
665 dentry->d_name.len);
666 if (err)
667 goto bail;
668
669 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
670 dentry->d_name.name,
671 dentry->d_name.len, &de_bh);
672 if (err < 0) {
673 mlog_errno(err);
674 goto bail;
675 }
676
677 err = ocfs2_meta_lock(inode, handle, &fe_bh, 1);
678 if (err < 0) {
679 if (err != -ENOENT)
680 mlog_errno(err);
681 goto bail;
682 }
683
684 fe = (struct ocfs2_dinode *) fe_bh->b_data;
685 if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
686 err = -EMLINK;
687 goto bail;
688 }
689
690 handle = ocfs2_start_trans(osb, handle, OCFS2_LINK_CREDITS);
691 if (IS_ERR(handle)) {
692 err = PTR_ERR(handle);
693 handle = NULL;
694 mlog_errno(err);
695 goto bail;
696 }
697
698 err = ocfs2_journal_access(handle, inode, fe_bh,
699 OCFS2_JOURNAL_ACCESS_WRITE);
700 if (err < 0) {
701 mlog_errno(err);
702 goto bail;
703 }
704
705 inode->i_nlink++;
706 inode->i_ctime = CURRENT_TIME;
707 fe->i_links_count = cpu_to_le16(inode->i_nlink);
708 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
709 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
710
711 err = ocfs2_journal_dirty(handle, fe_bh);
712 if (err < 0) {
713 le16_add_cpu(&fe->i_links_count, -1);
714 inode->i_nlink--;
715 mlog_errno(err);
716 goto bail;
717 }
718
719 err = ocfs2_add_entry(handle, dentry, inode,
720 OCFS2_I(inode)->ip_blkno,
721 parent_fe_bh, de_bh);
722 if (err) {
723 le16_add_cpu(&fe->i_links_count, -1);
724 inode->i_nlink--;
725 mlog_errno(err);
726 goto bail;
727 }
728
729 atomic_inc(&inode->i_count);
730 dentry->d_op = &ocfs2_dentry_ops;
731 d_instantiate(dentry, inode);
732 bail:
733 if (handle)
734 ocfs2_commit_trans(handle);
735 if (de_bh)
736 brelse(de_bh);
737 if (fe_bh)
738 brelse(fe_bh);
739 if (parent_fe_bh)
740 brelse(parent_fe_bh);
741
742 mlog_exit(err);
743
744 return err;
745 }
746
747 static int ocfs2_unlink(struct inode *dir,
748 struct dentry *dentry)
749 {
750 int status;
751 unsigned int saved_nlink = 0;
752 struct inode *inode = dentry->d_inode;
753 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
754 u64 blkno;
755 struct ocfs2_dinode *fe = NULL;
756 struct buffer_head *fe_bh = NULL;
757 struct buffer_head *parent_node_bh = NULL;
758 struct ocfs2_journal_handle *handle = NULL;
759 struct ocfs2_dir_entry *dirent = NULL;
760 struct buffer_head *dirent_bh = NULL;
761 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
762 struct buffer_head *orphan_entry_bh = NULL;
763
764 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
765 dentry->d_name.len, dentry->d_name.name);
766
767 BUG_ON(dentry->d_parent->d_inode != dir);
768
769 mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
770
771 if (inode == osb->root_inode) {
772 mlog(0, "Cannot delete the root directory\n");
773 status = -EPERM;
774 goto leave;
775 }
776
777 handle = ocfs2_alloc_handle(osb);
778 if (handle == NULL) {
779 status = -ENOMEM;
780 mlog_errno(status);
781 goto leave;
782 }
783
784 status = ocfs2_meta_lock(dir, handle, &parent_node_bh, 1);
785 if (status < 0) {
786 if (status != -ENOENT)
787 mlog_errno(status);
788 goto leave;
789 }
790
791 status = ocfs2_find_files_on_disk(dentry->d_name.name,
792 dentry->d_name.len, &blkno,
793 dir, &dirent_bh, &dirent);
794 if (status < 0) {
795 if (status != -ENOENT)
796 mlog_errno(status);
797 goto leave;
798 }
799
800 if (OCFS2_I(inode)->ip_blkno != blkno) {
801 status = -ENOENT;
802
803 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
804 (unsigned long long)OCFS2_I(inode)->ip_blkno,
805 (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
806 goto leave;
807 }
808
809 status = ocfs2_meta_lock(inode, handle, &fe_bh, 1);
810 if (status < 0) {
811 if (status != -ENOENT)
812 mlog_errno(status);
813 goto leave;
814 }
815
816 if (S_ISDIR(inode->i_mode)) {
817 if (!ocfs2_empty_dir(inode)) {
818 status = -ENOTEMPTY;
819 goto leave;
820 } else if (inode->i_nlink != 2) {
821 status = -ENOTEMPTY;
822 goto leave;
823 }
824 }
825
826 /* There are still a few steps left until we can consider the
827 * unlink to have succeeded. Save off nlink here before
828 * modification so we can set it back in case we hit an issue
829 * before commit. */
830 saved_nlink = inode->i_nlink;
831 if (S_ISDIR(inode->i_mode))
832 inode->i_nlink = 0;
833 else
834 inode->i_nlink--;
835
836 status = ocfs2_request_unlink_vote(inode, dentry,
837 (unsigned int) inode->i_nlink);
838 if (status < 0) {
839 /* This vote should succeed under all normal
840 * circumstances. */
841 mlog_errno(status);
842 goto leave;
843 }
844
845 if (!inode->i_nlink) {
846 status = ocfs2_prepare_orphan_dir(osb, handle, inode,
847 orphan_name,
848 &orphan_entry_bh);
849 if (status < 0) {
850 mlog_errno(status);
851 goto leave;
852 }
853 }
854
855 handle = ocfs2_start_trans(osb, handle, OCFS2_UNLINK_CREDITS);
856 if (IS_ERR(handle)) {
857 status = PTR_ERR(handle);
858 handle = NULL;
859 mlog_errno(status);
860 goto leave;
861 }
862
863 status = ocfs2_journal_access(handle, inode, fe_bh,
864 OCFS2_JOURNAL_ACCESS_WRITE);
865 if (status < 0) {
866 mlog_errno(status);
867 goto leave;
868 }
869
870 fe = (struct ocfs2_dinode *) fe_bh->b_data;
871
872 if (!inode->i_nlink) {
873 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
874 orphan_entry_bh);
875 if (status < 0) {
876 mlog_errno(status);
877 goto leave;
878 }
879 }
880
881 /* delete the name from the parent dir */
882 status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
883 if (status < 0) {
884 mlog_errno(status);
885 goto leave;
886 }
887
888 /* We can set nlink on the dinode now. clear the saved version
889 * so that it doesn't get set later. */
890 fe->i_links_count = cpu_to_le16(inode->i_nlink);
891 saved_nlink = 0;
892
893 status = ocfs2_journal_dirty(handle, fe_bh);
894 if (status < 0) {
895 mlog_errno(status);
896 goto leave;
897 }
898
899 if (S_ISDIR(inode->i_mode)) {
900 dir->i_nlink--;
901 status = ocfs2_mark_inode_dirty(handle, dir,
902 parent_node_bh);
903 if (status < 0) {
904 mlog_errno(status);
905 dir->i_nlink++;
906 }
907 }
908
909 leave:
910 if (status < 0 && saved_nlink)
911 inode->i_nlink = saved_nlink;
912
913 if (handle)
914 ocfs2_commit_trans(handle);
915
916 if (fe_bh)
917 brelse(fe_bh);
918
919 if (dirent_bh)
920 brelse(dirent_bh);
921
922 if (parent_node_bh)
923 brelse(parent_node_bh);
924
925 if (orphan_entry_bh)
926 brelse(orphan_entry_bh);
927
928 mlog_exit(status);
929
930 return status;
931 }
932
933 /*
934 * The only place this should be used is rename!
935 * if they have the same id, then the 1st one is the only one locked.
936 */
937 static int ocfs2_double_lock(struct ocfs2_super *osb,
938 struct ocfs2_journal_handle *handle,
939 struct buffer_head **bh1,
940 struct inode *inode1,
941 struct buffer_head **bh2,
942 struct inode *inode2)
943 {
944 int status;
945 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
946 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
947 struct buffer_head **tmpbh;
948 struct inode *tmpinode;
949
950 mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
951 (unsigned long long)oi1->ip_blkno,
952 (unsigned long long)oi2->ip_blkno);
953
954 BUG_ON(!handle);
955
956 if (*bh1)
957 *bh1 = NULL;
958 if (*bh2)
959 *bh2 = NULL;
960
961 /* we always want to lock the one with the lower lockid first. */
962 if (oi1->ip_blkno != oi2->ip_blkno) {
963 if (oi1->ip_blkno < oi2->ip_blkno) {
964 /* switch id1 and id2 around */
965 mlog(0, "switching them around...\n");
966 tmpbh = bh2;
967 bh2 = bh1;
968 bh1 = tmpbh;
969
970 tmpinode = inode2;
971 inode2 = inode1;
972 inode1 = tmpinode;
973 }
974 /* lock id2 */
975 status = ocfs2_meta_lock(inode2, handle, bh2, 1);
976 if (status < 0) {
977 if (status != -ENOENT)
978 mlog_errno(status);
979 goto bail;
980 }
981 }
982 /* lock id1 */
983 status = ocfs2_meta_lock(inode1, handle, bh1, 1);
984 if (status < 0) {
985 if (status != -ENOENT)
986 mlog_errno(status);
987 goto bail;
988 }
989 bail:
990 mlog_exit(status);
991 return status;
992 }
993
994 #define PARENT_INO(buffer) \
995 ((struct ocfs2_dir_entry *) \
996 ((char *)buffer + \
997 le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode
998
999 static int ocfs2_rename(struct inode *old_dir,
1000 struct dentry *old_dentry,
1001 struct inode *new_dir,
1002 struct dentry *new_dentry)
1003 {
1004 int status = 0, rename_lock = 0;
1005 struct inode *old_inode = old_dentry->d_inode;
1006 struct inode *new_inode = new_dentry->d_inode;
1007 struct ocfs2_dinode *newfe = NULL;
1008 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1009 struct buffer_head *orphan_entry_bh = NULL;
1010 struct buffer_head *newfe_bh = NULL;
1011 struct buffer_head *insert_entry_bh = NULL;
1012 struct ocfs2_super *osb = NULL;
1013 u64 newfe_blkno;
1014 struct ocfs2_journal_handle *handle = NULL;
1015 struct buffer_head *old_dir_bh = NULL;
1016 struct buffer_head *new_dir_bh = NULL;
1017 struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry
1018 // and new_dentry
1019 struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
1020 struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
1021 // this is the 1st dirent bh
1022 nlink_t old_dir_nlink = old_dir->i_nlink, new_dir_nlink = new_dir->i_nlink;
1023 unsigned int links_count;
1024
1025 /* At some point it might be nice to break this function up a
1026 * bit. */
1027
1028 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
1029 old_dir, old_dentry, new_dir, new_dentry,
1030 old_dentry->d_name.len, old_dentry->d_name.name,
1031 new_dentry->d_name.len, new_dentry->d_name.name);
1032
1033 osb = OCFS2_SB(old_dir->i_sb);
1034
1035 if (new_inode) {
1036 if (!igrab(new_inode))
1037 BUG();
1038 }
1039
1040 if (atomic_read(&old_dentry->d_count) > 2) {
1041 shrink_dcache_parent(old_dentry);
1042 if (atomic_read(&old_dentry->d_count) > 2) {
1043 status = -EBUSY;
1044 goto bail;
1045 }
1046 }
1047
1048 /* Assume a directory heirarchy thusly:
1049 * a/b/c
1050 * a/d
1051 * a,b,c, and d are all directories.
1052 *
1053 * from cwd of 'a' on both nodes:
1054 * node1: mv b/c d
1055 * node2: mv d b/c
1056 *
1057 * And that's why, just like the VFS, we need a file system
1058 * rename lock. */
1059 if (old_dentry != new_dentry) {
1060 status = ocfs2_rename_lock(osb);
1061 if (status < 0) {
1062 mlog_errno(status);
1063 goto bail;
1064 }
1065 rename_lock = 1;
1066 }
1067
1068 handle = ocfs2_alloc_handle(osb);
1069 if (handle == NULL) {
1070 status = -ENOMEM;
1071 mlog_errno(status);
1072 goto bail;
1073 }
1074
1075 /* if old and new are the same, this'll just do one lock. */
1076 status = ocfs2_double_lock(osb, handle,
1077 &old_dir_bh, old_dir,
1078 &new_dir_bh, new_dir);
1079 if (status < 0) {
1080 mlog_errno(status);
1081 goto bail;
1082 }
1083
1084 /* make sure both dirs have bhs
1085 * get an extra ref on old_dir_bh if old==new */
1086 if (!new_dir_bh) {
1087 if (old_dir_bh) {
1088 new_dir_bh = old_dir_bh;
1089 get_bh(new_dir_bh);
1090 } else {
1091 mlog(ML_ERROR, "no old_dir_bh!\n");
1092 status = -EIO;
1093 goto bail;
1094 }
1095 }
1096
1097 if (S_ISDIR(old_inode->i_mode)) {
1098 /* Directories actually require metadata updates to
1099 * the directory info so we can't get away with not
1100 * doing node locking on it. */
1101 status = ocfs2_meta_lock(old_inode, handle, NULL, 1);
1102 if (status < 0) {
1103 if (status != -ENOENT)
1104 mlog_errno(status);
1105 goto bail;
1106 }
1107
1108 status = ocfs2_request_rename_vote(old_inode, old_dentry);
1109 if (status < 0) {
1110 mlog_errno(status);
1111 goto bail;
1112 }
1113
1114 status = -EIO;
1115 old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0);
1116 if (!old_inode_de_bh)
1117 goto bail;
1118
1119 status = -EIO;
1120 if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) !=
1121 OCFS2_I(old_dir)->ip_blkno)
1122 goto bail;
1123 status = -EMLINK;
1124 if (!new_inode && new_dir!=old_dir &&
1125 new_dir->i_nlink >= OCFS2_LINK_MAX)
1126 goto bail;
1127 } else {
1128 /* Ah, the simple case - we're a file so just send a
1129 * message. */
1130 status = ocfs2_request_rename_vote(old_inode, old_dentry);
1131 if (status < 0) {
1132 mlog_errno(status);
1133 goto bail;
1134 }
1135 }
1136
1137 status = -ENOENT;
1138 old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1139 old_dentry->d_name.len,
1140 old_dir, &old_de);
1141 if (!old_de_bh)
1142 goto bail;
1143
1144 /*
1145 * Check for inode number is _not_ due to possible IO errors.
1146 * We might rmdir the source, keep it as pwd of some process
1147 * and merrily kill the link to whatever was created under the
1148 * same name. Goodbye sticky bit ;-<
1149 */
1150 if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno)
1151 goto bail;
1152
1153 /* check if the target already exists (in which case we need
1154 * to delete it */
1155 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1156 new_dentry->d_name.len,
1157 &newfe_blkno, new_dir, &new_de_bh,
1158 &new_de);
1159 /* The only error we allow here is -ENOENT because the new
1160 * file not existing is perfectly valid. */
1161 if ((status < 0) && (status != -ENOENT)) {
1162 /* If we cannot find the file specified we should just */
1163 /* return the error... */
1164 mlog_errno(status);
1165 goto bail;
1166 }
1167
1168 if (!new_de && new_inode)
1169 mlog(ML_ERROR, "inode %lu does not exist in it's parent "
1170 "directory!", new_inode->i_ino);
1171
1172 /* In case we need to overwrite an existing file, we blow it
1173 * away first */
1174 if (new_de) {
1175 /* VFS didn't think there existed an inode here, but
1176 * someone else in the cluster must have raced our
1177 * rename to create one. Today we error cleanly, in
1178 * the future we should consider calling iget to build
1179 * a new struct inode for this entry. */
1180 if (!new_inode) {
1181 status = -EACCES;
1182
1183 mlog(0, "We found an inode for name %.*s but VFS "
1184 "didn't give us one.\n", new_dentry->d_name.len,
1185 new_dentry->d_name.name);
1186 goto bail;
1187 }
1188
1189 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1190 status = -EACCES;
1191
1192 mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1193 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1194 (unsigned long long)newfe_blkno,
1195 OCFS2_I(new_inode)->ip_flags);
1196 goto bail;
1197 }
1198
1199 status = ocfs2_meta_lock(new_inode, handle, &newfe_bh, 1);
1200 if (status < 0) {
1201 if (status != -ENOENT)
1202 mlog_errno(status);
1203 goto bail;
1204 }
1205
1206 if (S_ISDIR(new_inode->i_mode))
1207 links_count = 0;
1208 else
1209 links_count = (unsigned int) (new_inode->i_nlink - 1);
1210
1211 status = ocfs2_request_unlink_vote(new_inode, new_dentry,
1212 links_count);
1213 if (status < 0) {
1214 mlog_errno(status);
1215 goto bail;
1216 }
1217
1218 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1219
1220 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1221 "newfebh=%p bhblocknr=%llu\n", new_de,
1222 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1223 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1224
1225 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1226 status = ocfs2_prepare_orphan_dir(osb, handle,
1227 new_inode,
1228 orphan_name,
1229 &orphan_entry_bh);
1230 if (status < 0) {
1231 mlog_errno(status);
1232 goto bail;
1233 }
1234 }
1235 } else {
1236 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1237
1238 status = ocfs2_check_dir_for_entry(new_dir,
1239 new_dentry->d_name.name,
1240 new_dentry->d_name.len);
1241 if (status)
1242 goto bail;
1243
1244 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1245 new_dentry->d_name.name,
1246 new_dentry->d_name.len,
1247 &insert_entry_bh);
1248 if (status < 0) {
1249 mlog_errno(status);
1250 goto bail;
1251 }
1252 }
1253
1254 handle = ocfs2_start_trans(osb, handle, OCFS2_RENAME_CREDITS);
1255 if (IS_ERR(handle)) {
1256 status = PTR_ERR(handle);
1257 handle = NULL;
1258 mlog_errno(status);
1259 goto bail;
1260 }
1261
1262 if (new_de) {
1263 if (S_ISDIR(new_inode->i_mode)) {
1264 if (!ocfs2_empty_dir(new_inode) ||
1265 new_inode->i_nlink != 2) {
1266 status = -ENOTEMPTY;
1267 goto bail;
1268 }
1269 }
1270 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1271 OCFS2_JOURNAL_ACCESS_WRITE);
1272 if (status < 0) {
1273 mlog_errno(status);
1274 goto bail;
1275 }
1276
1277 if (S_ISDIR(new_inode->i_mode) ||
1278 (newfe->i_links_count == cpu_to_le16(1))){
1279 status = ocfs2_orphan_add(osb, handle, new_inode,
1280 newfe, orphan_name,
1281 orphan_entry_bh);
1282 if (status < 0) {
1283 mlog_errno(status);
1284 goto bail;
1285 }
1286 }
1287
1288 /* change the dirent to point to the correct inode */
1289 status = ocfs2_journal_access(handle, new_dir, new_de_bh,
1290 OCFS2_JOURNAL_ACCESS_WRITE);
1291 if (status < 0) {
1292 mlog_errno(status);
1293 goto bail;
1294 }
1295 new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno);
1296 new_de->file_type = old_de->file_type;
1297 new_dir->i_version++;
1298 status = ocfs2_journal_dirty(handle, new_de_bh);
1299 if (status < 0) {
1300 mlog_errno(status);
1301 goto bail;
1302 }
1303
1304 if (S_ISDIR(new_inode->i_mode))
1305 newfe->i_links_count = 0;
1306 else
1307 le16_add_cpu(&newfe->i_links_count, -1);
1308
1309 status = ocfs2_journal_dirty(handle, newfe_bh);
1310 if (status < 0) {
1311 mlog_errno(status);
1312 goto bail;
1313 }
1314 } else {
1315 /* if the name was not found in new_dir, add it now */
1316 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1317 OCFS2_I(old_inode)->ip_blkno,
1318 new_dir_bh, insert_entry_bh);
1319 }
1320
1321 old_inode->i_ctime = CURRENT_TIME;
1322 mark_inode_dirty(old_inode);
1323
1324 /* now that the name has been added to new_dir, remove the old name */
1325 status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1326 if (status < 0) {
1327 mlog_errno(status);
1328 goto bail;
1329 }
1330
1331 if (new_inode) {
1332 new_inode->i_nlink--;
1333 new_inode->i_ctime = CURRENT_TIME;
1334 }
1335 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1336 if (old_inode_de_bh) {
1337 status = ocfs2_journal_access(handle, old_inode,
1338 old_inode_de_bh,
1339 OCFS2_JOURNAL_ACCESS_WRITE);
1340 PARENT_INO(old_inode_de_bh->b_data) =
1341 cpu_to_le64(OCFS2_I(new_dir)->ip_blkno);
1342 status = ocfs2_journal_dirty(handle, old_inode_de_bh);
1343 old_dir->i_nlink--;
1344 if (new_inode) {
1345 new_inode->i_nlink--;
1346 } else {
1347 new_dir->i_nlink++;
1348 mark_inode_dirty(new_dir);
1349 }
1350 }
1351 mark_inode_dirty(old_dir);
1352 if (new_inode)
1353 mark_inode_dirty(new_inode);
1354
1355 if (old_dir != new_dir)
1356 if (new_dir_nlink != new_dir->i_nlink) {
1357 if (!new_dir_bh) {
1358 mlog(ML_ERROR, "need to change nlink for new "
1359 "dir %llu from %d to %d but bh is NULL\n",
1360 (unsigned long long)OCFS2_I(new_dir)->ip_blkno,
1361 (int)new_dir_nlink, new_dir->i_nlink);
1362 } else {
1363 struct ocfs2_dinode *fe;
1364 status = ocfs2_journal_access(handle,
1365 new_dir,
1366 new_dir_bh,
1367 OCFS2_JOURNAL_ACCESS_WRITE);
1368 fe = (struct ocfs2_dinode *) new_dir_bh->b_data;
1369 fe->i_links_count = cpu_to_le16(new_dir->i_nlink);
1370 status = ocfs2_journal_dirty(handle, new_dir_bh);
1371 }
1372 }
1373
1374 if (old_dir_nlink != old_dir->i_nlink) {
1375 if (!old_dir_bh) {
1376 mlog(ML_ERROR, "need to change nlink for old dir "
1377 "%llu from %d to %d but bh is NULL!\n",
1378 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1379 (int)old_dir_nlink, old_dir->i_nlink);
1380 } else {
1381 struct ocfs2_dinode *fe;
1382 status = ocfs2_journal_access(handle, old_dir,
1383 old_dir_bh,
1384 OCFS2_JOURNAL_ACCESS_WRITE);
1385 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1386 fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1387 status = ocfs2_journal_dirty(handle, old_dir_bh);
1388 }
1389 }
1390
1391 status = 0;
1392 bail:
1393 if (rename_lock)
1394 ocfs2_rename_unlock(osb);
1395
1396 if (handle)
1397 ocfs2_commit_trans(handle);
1398
1399 if (new_inode)
1400 sync_mapping_buffers(old_inode->i_mapping);
1401
1402 if (new_inode)
1403 iput(new_inode);
1404 if (newfe_bh)
1405 brelse(newfe_bh);
1406 if (old_dir_bh)
1407 brelse(old_dir_bh);
1408 if (new_dir_bh)
1409 brelse(new_dir_bh);
1410 if (new_de_bh)
1411 brelse(new_de_bh);
1412 if (old_de_bh)
1413 brelse(old_de_bh);
1414 if (old_inode_de_bh)
1415 brelse(old_inode_de_bh);
1416 if (orphan_entry_bh)
1417 brelse(orphan_entry_bh);
1418 if (insert_entry_bh)
1419 brelse(insert_entry_bh);
1420
1421 mlog_exit(status);
1422
1423 return status;
1424 }
1425
1426 /*
1427 * we expect i_size = strlen(symname). Copy symname into the file
1428 * data, including the null terminator.
1429 */
1430 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1431 struct ocfs2_journal_handle *handle,
1432 struct inode *inode,
1433 const char *symname)
1434 {
1435 struct buffer_head **bhs = NULL;
1436 const char *c;
1437 struct super_block *sb = osb->sb;
1438 u64 p_blkno;
1439 int p_blocks;
1440 int virtual, blocks, status, i, bytes_left;
1441
1442 bytes_left = i_size_read(inode) + 1;
1443 /* we can't trust i_blocks because we're actually going to
1444 * write i_size + 1 bytes. */
1445 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1446
1447 mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1448 (unsigned long long)inode->i_blocks,
1449 i_size_read(inode), blocks);
1450
1451 /* Sanity check -- make sure we're going to fit. */
1452 if (bytes_left >
1453 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1454 status = -EIO;
1455 mlog_errno(status);
1456 goto bail;
1457 }
1458
1459 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1460 if (!bhs) {
1461 status = -ENOMEM;
1462 mlog_errno(status);
1463 goto bail;
1464 }
1465
1466 status = ocfs2_extent_map_get_blocks(inode, 0, 1, &p_blkno,
1467 &p_blocks);
1468 if (status < 0) {
1469 mlog_errno(status);
1470 goto bail;
1471 }
1472
1473 /* links can never be larger than one cluster so we know this
1474 * is all going to be contiguous, but do a sanity check
1475 * anyway. */
1476 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1477 status = -EIO;
1478 mlog_errno(status);
1479 goto bail;
1480 }
1481
1482 virtual = 0;
1483 while(bytes_left > 0) {
1484 c = &symname[virtual * sb->s_blocksize];
1485
1486 bhs[virtual] = sb_getblk(sb, p_blkno);
1487 if (!bhs[virtual]) {
1488 status = -ENOMEM;
1489 mlog_errno(status);
1490 goto bail;
1491 }
1492 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1493
1494 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1495 OCFS2_JOURNAL_ACCESS_CREATE);
1496 if (status < 0) {
1497 mlog_errno(status);
1498 goto bail;
1499 }
1500
1501 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1502
1503 memcpy(bhs[virtual]->b_data, c,
1504 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1505 bytes_left);
1506
1507 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1508 if (status < 0) {
1509 mlog_errno(status);
1510 goto bail;
1511 }
1512
1513 virtual++;
1514 p_blkno++;
1515 bytes_left -= sb->s_blocksize;
1516 }
1517
1518 status = 0;
1519 bail:
1520
1521 if (bhs) {
1522 for(i = 0; i < blocks; i++)
1523 if (bhs[i])
1524 brelse(bhs[i]);
1525 kfree(bhs);
1526 }
1527
1528 mlog_exit(status);
1529 return status;
1530 }
1531
1532 static int ocfs2_symlink(struct inode *dir,
1533 struct dentry *dentry,
1534 const char *symname)
1535 {
1536 int status, l, credits;
1537 u64 newsize;
1538 struct ocfs2_super *osb = NULL;
1539 struct inode *inode = NULL;
1540 struct super_block *sb;
1541 struct buffer_head *new_fe_bh = NULL;
1542 struct buffer_head *de_bh = NULL;
1543 struct buffer_head *parent_fe_bh = NULL;
1544 struct ocfs2_dinode *fe = NULL;
1545 struct ocfs2_dinode *dirfe;
1546 struct ocfs2_journal_handle *handle = NULL;
1547 struct ocfs2_alloc_context *inode_ac = NULL;
1548 struct ocfs2_alloc_context *data_ac = NULL;
1549
1550 mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1551 dentry, symname, dentry->d_name.len, dentry->d_name.name);
1552
1553 sb = dir->i_sb;
1554 osb = OCFS2_SB(sb);
1555
1556 l = strlen(symname) + 1;
1557
1558 credits = ocfs2_calc_symlink_credits(sb);
1559
1560 handle = ocfs2_alloc_handle(osb);
1561 if (handle == NULL) {
1562 status = -ENOMEM;
1563 mlog_errno(status);
1564 goto bail;
1565 }
1566
1567 /* lock the parent directory */
1568 status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
1569 if (status < 0) {
1570 if (status != -ENOENT)
1571 mlog_errno(status);
1572 goto bail;
1573 }
1574
1575 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1576 if (!dirfe->i_links_count) {
1577 /* can't make a file in a deleted directory. */
1578 status = -ENOENT;
1579 goto bail;
1580 }
1581
1582 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1583 dentry->d_name.len);
1584 if (status)
1585 goto bail;
1586
1587 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1588 dentry->d_name.name,
1589 dentry->d_name.len, &de_bh);
1590 if (status < 0) {
1591 mlog_errno(status);
1592 goto bail;
1593 }
1594
1595 status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
1596 if (status < 0) {
1597 if (status != -ENOSPC)
1598 mlog_errno(status);
1599 goto bail;
1600 }
1601
1602 /* don't reserve bitmap space for fast symlinks. */
1603 if (l > ocfs2_fast_symlink_chars(sb)) {
1604 status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
1605 if (status < 0) {
1606 if (status != -ENOSPC)
1607 mlog_errno(status);
1608 goto bail;
1609 }
1610 }
1611
1612 handle = ocfs2_start_trans(osb, handle, credits);
1613 if (IS_ERR(handle)) {
1614 status = PTR_ERR(handle);
1615 handle = NULL;
1616 mlog_errno(status);
1617 goto bail;
1618 }
1619
1620 status = ocfs2_mknod_locked(osb, dir, dentry,
1621 S_IFLNK | S_IRWXUGO, 0,
1622 &new_fe_bh, parent_fe_bh, handle,
1623 &inode, inode_ac);
1624 if (status < 0) {
1625 mlog_errno(status);
1626 goto bail;
1627 }
1628
1629 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1630 inode->i_rdev = 0;
1631 newsize = l - 1;
1632 if (l > ocfs2_fast_symlink_chars(sb)) {
1633 inode->i_op = &ocfs2_symlink_inode_operations;
1634 status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh,
1635 handle, data_ac, NULL,
1636 NULL);
1637 if (status < 0) {
1638 if (status != -ENOSPC && status != -EINTR) {
1639 mlog(ML_ERROR,
1640 "Failed to extend file to %llu\n",
1641 (unsigned long long)newsize);
1642 mlog_errno(status);
1643 status = -ENOSPC;
1644 }
1645 goto bail;
1646 }
1647 i_size_write(inode, newsize);
1648 inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize);
1649 } else {
1650 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1651 memcpy((char *) fe->id2.i_symlink, symname, l);
1652 i_size_write(inode, newsize);
1653 inode->i_blocks = 0;
1654 }
1655
1656 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1657 if (status < 0) {
1658 mlog_errno(status);
1659 goto bail;
1660 }
1661
1662 if (!ocfs2_inode_is_fast_symlink(inode)) {
1663 status = ocfs2_create_symlink_data(osb, handle, inode,
1664 symname);
1665 if (status < 0) {
1666 mlog_errno(status);
1667 goto bail;
1668 }
1669 }
1670
1671 status = ocfs2_add_entry(handle, dentry, inode,
1672 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1673 de_bh);
1674 if (status < 0) {
1675 mlog_errno(status);
1676 goto bail;
1677 }
1678
1679 insert_inode_hash(inode);
1680 dentry->d_op = &ocfs2_dentry_ops;
1681 d_instantiate(dentry, inode);
1682 bail:
1683 if (handle)
1684 ocfs2_commit_trans(handle);
1685 if (new_fe_bh)
1686 brelse(new_fe_bh);
1687 if (parent_fe_bh)
1688 brelse(parent_fe_bh);
1689 if (de_bh)
1690 brelse(de_bh);
1691 if (inode_ac)
1692 ocfs2_free_alloc_context(inode_ac);
1693 if (data_ac)
1694 ocfs2_free_alloc_context(data_ac);
1695 if ((status < 0) && inode)
1696 iput(inode);
1697
1698 mlog_exit(status);
1699
1700 return status;
1701 }
1702
1703 int ocfs2_check_dir_entry(struct inode * dir,
1704 struct ocfs2_dir_entry * de,
1705 struct buffer_head * bh,
1706 unsigned long offset)
1707 {
1708 const char *error_msg = NULL;
1709 const int rlen = le16_to_cpu(de->rec_len);
1710
1711 if (rlen < OCFS2_DIR_REC_LEN(1))
1712 error_msg = "rec_len is smaller than minimal";
1713 else if (rlen % 4 != 0)
1714 error_msg = "rec_len % 4 != 0";
1715 else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
1716 error_msg = "rec_len is too small for name_len";
1717 else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
1718 error_msg = "directory entry across blocks";
1719
1720 if (error_msg != NULL)
1721 mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
1722 "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
1723 (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
1724 offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
1725 de->name_len);
1726 return error_msg == NULL ? 1 : 0;
1727 }
1728
1729 /* we don't always have a dentry for what we want to add, so people
1730 * like orphan dir can call this instead.
1731 *
1732 * If you pass me insert_bh, I'll skip the search of the other dir
1733 * blocks and put the record in there.
1734 */
1735 static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle,
1736 struct inode *dir,
1737 const char *name, int namelen,
1738 struct inode *inode, u64 blkno,
1739 struct buffer_head *parent_fe_bh,
1740 struct buffer_head *insert_bh)
1741 {
1742 unsigned long offset;
1743 unsigned short rec_len;
1744 struct ocfs2_dir_entry *de, *de1;
1745 struct super_block *sb;
1746 int retval, status;
1747
1748 mlog_entry_void();
1749
1750 sb = dir->i_sb;
1751
1752 if (!namelen)
1753 return -EINVAL;
1754
1755 rec_len = OCFS2_DIR_REC_LEN(namelen);
1756 offset = 0;
1757 de = (struct ocfs2_dir_entry *) insert_bh->b_data;
1758 while (1) {
1759 BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data);
1760 /* These checks should've already been passed by the
1761 * prepare function, but I guess we can leave them
1762 * here anyway. */
1763 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
1764 retval = -ENOENT;
1765 goto bail;
1766 }
1767 if (ocfs2_match(namelen, name, de)) {
1768 retval = -EEXIST;
1769 goto bail;
1770 }
1771 if (((le64_to_cpu(de->inode) == 0) &&
1772 (le16_to_cpu(de->rec_len) >= rec_len)) ||
1773 (le16_to_cpu(de->rec_len) >=
1774 (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
1775 status = ocfs2_journal_access(handle, dir, insert_bh,
1776 OCFS2_JOURNAL_ACCESS_WRITE);
1777 /* By now the buffer is marked for journaling */
1778 offset += le16_to_cpu(de->rec_len);
1779 if (le64_to_cpu(de->inode)) {
1780 de1 = (struct ocfs2_dir_entry *)((char *) de +
1781 OCFS2_DIR_REC_LEN(de->name_len));
1782 de1->rec_len =
1783 cpu_to_le16(le16_to_cpu(de->rec_len) -
1784 OCFS2_DIR_REC_LEN(de->name_len));
1785 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
1786 de = de1;
1787 }
1788 de->file_type = OCFS2_FT_UNKNOWN;
1789 if (blkno) {
1790 de->inode = cpu_to_le64(blkno);
1791 ocfs2_set_de_type(de, inode->i_mode);
1792 } else
1793 de->inode = 0;
1794 de->name_len = namelen;
1795 memcpy(de->name, name, namelen);
1796
1797 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
1798 dir->i_version++;
1799 status = ocfs2_journal_dirty(handle, insert_bh);
1800 retval = 0;
1801 goto bail;
1802 }
1803 offset += le16_to_cpu(de->rec_len);
1804 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
1805 }
1806
1807 /* when you think about it, the assert above should prevent us
1808 * from ever getting here. */
1809 retval = -ENOSPC;
1810 bail:
1811
1812 mlog_exit(retval);
1813 return retval;
1814 }
1815
1816
1817 /*
1818 * ocfs2_delete_entry deletes a directory entry by merging it with the
1819 * previous entry
1820 */
1821 static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle,
1822 struct inode *dir,
1823 struct ocfs2_dir_entry *de_del,
1824 struct buffer_head *bh)
1825 {
1826 struct ocfs2_dir_entry *de, *pde;
1827 int i, status = -ENOENT;
1828
1829 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
1830
1831 i = 0;
1832 pde = NULL;
1833 de = (struct ocfs2_dir_entry *) bh->b_data;
1834 while (i < bh->b_size) {
1835 if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
1836 status = -EIO;
1837 mlog_errno(status);
1838 goto bail;
1839 }
1840 if (de == de_del) {
1841 status = ocfs2_journal_access(handle, dir, bh,
1842 OCFS2_JOURNAL_ACCESS_WRITE);
1843 if (status < 0) {
1844 status = -EIO;
1845 mlog_errno(status);
1846 goto bail;
1847 }
1848 if (pde)
1849 pde->rec_len =
1850 cpu_to_le16(le16_to_cpu(pde->rec_len) +
1851 le16_to_cpu(de->rec_len));
1852 else
1853 de->inode = 0;
1854 dir->i_version++;
1855 status = ocfs2_journal_dirty(handle, bh);
1856 goto bail;
1857 }
1858 i += le16_to_cpu(de->rec_len);
1859 pde = de;
1860 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
1861 }
1862 bail:
1863 mlog_exit(status);
1864 return status;
1865 }
1866
1867 /*
1868 * Returns 0 if not found, -1 on failure, and 1 on success
1869 */
1870 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
1871 struct inode *dir,
1872 const char *name, int namelen,
1873 unsigned long offset,
1874 struct ocfs2_dir_entry **res_dir)
1875 {
1876 struct ocfs2_dir_entry *de;
1877 char *dlimit, *de_buf;
1878 int de_len;
1879 int ret = 0;
1880
1881 mlog_entry_void();
1882
1883 de_buf = bh->b_data;
1884 dlimit = de_buf + dir->i_sb->s_blocksize;
1885
1886 while (de_buf < dlimit) {
1887 /* this code is executed quadratically often */
1888 /* do minimal checking `by hand' */
1889
1890 de = (struct ocfs2_dir_entry *) de_buf;
1891
1892 if (de_buf + namelen <= dlimit &&
1893 ocfs2_match(namelen, name, de)) {
1894 /* found a match - just to be sure, do a full check */
1895 if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
1896 ret = -1;
1897 goto bail;
1898 }
1899 *res_dir = de;
1900 ret = 1;
1901 goto bail;
1902 }
1903
1904 /* prevent looping on a bad block */
1905 de_len = le16_to_cpu(de->rec_len);
1906 if (de_len <= 0) {
1907 ret = -1;
1908 goto bail;
1909 }
1910
1911 de_buf += de_len;
1912 offset += de_len;
1913 }
1914
1915 bail:
1916 mlog_exit(ret);
1917 return ret;
1918 }
1919
1920 struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
1921 struct inode *dir,
1922 struct ocfs2_dir_entry **res_dir)
1923 {
1924 struct super_block *sb;
1925 struct buffer_head *bh_use[NAMEI_RA_SIZE];
1926 struct buffer_head *bh, *ret = NULL;
1927 unsigned long start, block, b;
1928 int ra_max = 0; /* Number of bh's in the readahead
1929 buffer, bh_use[] */
1930 int ra_ptr = 0; /* Current index into readahead
1931 buffer */
1932 int num = 0;
1933 int nblocks, i, err;
1934
1935 mlog_entry_void();
1936
1937 *res_dir = NULL;
1938 sb = dir->i_sb;
1939
1940 nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
1941 start = OCFS2_I(dir)->ip_dir_start_lookup;
1942 if (start >= nblocks)
1943 start = 0;
1944 block = start;
1945
1946 restart:
1947 do {
1948 /*
1949 * We deal with the read-ahead logic here.
1950 */
1951 if (ra_ptr >= ra_max) {
1952 /* Refill the readahead buffer */
1953 ra_ptr = 0;
1954 b = block;
1955 for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
1956 /*
1957 * Terminate if we reach the end of the
1958 * directory and must wrap, or if our
1959 * search has finished at this block.
1960 */
1961 if (b >= nblocks || (num && block == start)) {
1962 bh_use[ra_max] = NULL;
1963 break;
1964 }
1965 num++;
1966
1967 /* XXX: questionable readahead stuff here */
1968 bh = ocfs2_bread(dir, b++, &err, 1);
1969 bh_use[ra_max] = bh;
1970 #if 0 // ???
1971 if (bh)
1972 ll_rw_block(READ, 1, &bh);
1973 #endif
1974 }
1975 }
1976 if ((bh = bh_use[ra_ptr++]) == NULL)
1977 goto next;
1978 wait_on_buffer(bh);
1979 if (!buffer_uptodate(bh)) {
1980 /* read error, skip block & hope for the best */
1981 brelse(bh);
1982 goto next;
1983 }
1984 i = ocfs2_search_dirblock(bh, dir, name, namelen,
1985 block << sb->s_blocksize_bits,
1986 res_dir);
1987 if (i == 1) {
1988 OCFS2_I(dir)->ip_dir_start_lookup = block;
1989 ret = bh;
1990 goto cleanup_and_exit;
1991 } else {
1992 brelse(bh);
1993 if (i < 0)
1994 goto cleanup_and_exit;
1995 }
1996 next:
1997 if (++block >= nblocks)
1998 block = 0;
1999 } while (block != start);
2000
2001 /*
2002 * If the directory has grown while we were searching, then
2003 * search the last part of the directory before giving up.
2004 */
2005 block = nblocks;
2006 nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2007 if (block < nblocks) {
2008 start = 0;
2009 goto restart;
2010 }
2011
2012 cleanup_and_exit:
2013 /* Clean up the read-ahead blocks */
2014 for (; ra_ptr < ra_max; ra_ptr++)
2015 brelse(bh_use[ra_ptr]);
2016
2017 mlog_exit_ptr(ret);
2018 return ret;
2019 }
2020
2021 static int ocfs2_blkno_stringify(u64 blkno, char *name)
2022 {
2023 int status, namelen;
2024
2025 mlog_entry_void();
2026
2027 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
2028 (long long)blkno);
2029 if (namelen <= 0) {
2030 if (namelen)
2031 status = namelen;
2032 else
2033 status = -EINVAL;
2034 mlog_errno(status);
2035 goto bail;
2036 }
2037 if (namelen != OCFS2_ORPHAN_NAMELEN) {
2038 status = -EINVAL;
2039 mlog_errno(status);
2040 goto bail;
2041 }
2042
2043 mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
2044 namelen);
2045
2046 status = 0;
2047 bail:
2048 mlog_exit(status);
2049 return status;
2050 }
2051
2052 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2053 struct ocfs2_journal_handle *handle,
2054 struct inode *inode,
2055 char *name,
2056 struct buffer_head **de_bh)
2057 {
2058 struct inode *orphan_dir_inode = NULL;
2059 struct buffer_head *orphan_dir_bh = NULL;
2060 int status = 0;
2061
2062 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2063 if (status < 0) {
2064 mlog_errno(status);
2065 goto leave;
2066 }
2067
2068 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2069 ORPHAN_DIR_SYSTEM_INODE,
2070 osb->slot_num);
2071 if (!orphan_dir_inode) {
2072 status = -ENOENT;
2073 mlog_errno(status);
2074 goto leave;
2075 }
2076
2077 ocfs2_handle_add_inode(handle, orphan_dir_inode);
2078 status = ocfs2_meta_lock(orphan_dir_inode, handle, &orphan_dir_bh, 1);
2079 if (status < 0) {
2080 mlog_errno(status);
2081 goto leave;
2082 }
2083
2084 status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2085 orphan_dir_bh, name,
2086 OCFS2_ORPHAN_NAMELEN, de_bh);
2087 if (status < 0) {
2088 mlog_errno(status);
2089 goto leave;
2090 }
2091
2092 leave:
2093 if (orphan_dir_inode)
2094 iput(orphan_dir_inode);
2095
2096 if (orphan_dir_bh)
2097 brelse(orphan_dir_bh);
2098
2099 mlog_exit(status);
2100 return status;
2101 }
2102
2103 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2104 struct ocfs2_journal_handle *handle,
2105 struct inode *inode,
2106 struct ocfs2_dinode *fe,
2107 char *name,
2108 struct buffer_head *de_bh)
2109 {
2110 struct inode *orphan_dir_inode = NULL;
2111 struct buffer_head *orphan_dir_bh = NULL;
2112 int status = 0;
2113 struct ocfs2_dinode *orphan_fe;
2114
2115 mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
2116
2117 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2118 ORPHAN_DIR_SYSTEM_INODE,
2119 osb->slot_num);
2120 if (!orphan_dir_inode) {
2121 status = -ENOENT;
2122 mlog_errno(status);
2123 goto leave;
2124 }
2125
2126 status = ocfs2_read_block(osb,
2127 OCFS2_I(orphan_dir_inode)->ip_blkno,
2128 &orphan_dir_bh, OCFS2_BH_CACHED,
2129 orphan_dir_inode);
2130 if (status < 0) {
2131 mlog_errno(status);
2132 goto leave;
2133 }
2134
2135 status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
2136 OCFS2_JOURNAL_ACCESS_WRITE);
2137 if (status < 0) {
2138 mlog_errno(status);
2139 goto leave;
2140 }
2141
2142 /* we're a cluster, and nlink can change on disk from
2143 * underneath us... */
2144 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2145 if (S_ISDIR(inode->i_mode))
2146 le16_add_cpu(&orphan_fe->i_links_count, 1);
2147 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2148
2149 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2150 if (status < 0) {
2151 mlog_errno(status);
2152 goto leave;
2153 }
2154
2155 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2156 OCFS2_ORPHAN_NAMELEN, inode,
2157 OCFS2_I(inode)->ip_blkno,
2158 orphan_dir_bh, de_bh);
2159 if (status < 0) {
2160 mlog_errno(status);
2161 goto leave;
2162 }
2163
2164 le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2165
2166 /* Record which orphan dir our inode now resides
2167 * in. delete_inode will use this to determine which orphan
2168 * dir to lock. */
2169 spin_lock(&OCFS2_I(inode)->ip_lock);
2170 OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num;
2171 spin_unlock(&OCFS2_I(inode)->ip_lock);
2172
2173 mlog(0, "Inode %llu orphaned in slot %d\n",
2174 (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
2175
2176 leave:
2177 if (orphan_dir_inode)
2178 iput(orphan_dir_inode);
2179
2180 if (orphan_dir_bh)
2181 brelse(orphan_dir_bh);
2182
2183 mlog_exit(status);
2184 return status;
2185 }
2186
2187 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2188 int ocfs2_orphan_del(struct ocfs2_super *osb,
2189 struct ocfs2_journal_handle *handle,
2190 struct inode *orphan_dir_inode,
2191 struct inode *inode,
2192 struct buffer_head *orphan_dir_bh)
2193 {
2194 char name[OCFS2_ORPHAN_NAMELEN + 1];
2195 struct ocfs2_dinode *orphan_fe;
2196 int status = 0;
2197 struct buffer_head *target_de_bh = NULL;
2198 struct ocfs2_dir_entry *target_de = NULL;
2199
2200 mlog_entry_void();
2201
2202 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2203 if (status < 0) {
2204 mlog_errno(status);
2205 goto leave;
2206 }
2207
2208 mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
2209 name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2210 OCFS2_ORPHAN_NAMELEN);
2211
2212 /* find it's spot in the orphan directory */
2213 target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
2214 orphan_dir_inode, &target_de);
2215 if (!target_de_bh) {
2216 status = -ENOENT;
2217 mlog_errno(status);
2218 goto leave;
2219 }
2220
2221 /* remove it from the orphan directory */
2222 status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
2223 target_de_bh);
2224 if (status < 0) {
2225 mlog_errno(status);
2226 goto leave;
2227 }
2228
2229 status = ocfs2_journal_access(handle,orphan_dir_inode, orphan_dir_bh,
2230 OCFS2_JOURNAL_ACCESS_WRITE);
2231 if (status < 0) {
2232 mlog_errno(status);
2233 goto leave;
2234 }
2235
2236 /* do the i_nlink dance! :) */
2237 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2238 if (S_ISDIR(inode->i_mode))
2239 le16_add_cpu(&orphan_fe->i_links_count, -1);
2240 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2241
2242 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2243 if (status < 0) {
2244 mlog_errno(status);
2245 goto leave;
2246 }
2247
2248 leave:
2249 if (target_de_bh)
2250 brelse(target_de_bh);
2251
2252 mlog_exit(status);
2253 return status;
2254 }
2255
2256 struct inode_operations ocfs2_dir_iops = {
2257 .create = ocfs2_create,
2258 .lookup = ocfs2_lookup,
2259 .link = ocfs2_link,
2260 .unlink = ocfs2_unlink,
2261 .rmdir = ocfs2_unlink,
2262 .symlink = ocfs2_symlink,
2263 .mkdir = ocfs2_mkdir,
2264 .mknod = ocfs2_mknod,
2265 .rename = ocfs2_rename,
2266 .setattr = ocfs2_setattr,
2267 .getattr = ocfs2_getattr,
2268 };
Software Suspend 2 for 2.6.18.y (mirror)