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ocfs2: move nlink check in ocfs2_mknod()
[deliverable/linux.git] / fs / ocfs2 / namei.c
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * namei.c
5 *
6 * Create and rename file, directory, symlinks
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * Portions of this code from linux/fs/ext3/dir.c
11 *
12 * Copyright (C) 1992, 1993, 1994, 1995
13 * Remy Card (card@masi.ibp.fr)
14 * Laboratoire MASI - Institut Blaise pascal
15 * Universite Pierre et Marie Curie (Paris VI)
16 *
17 * from
18 *
19 * linux/fs/minix/dir.c
20 *
21 * Copyright (C) 1991, 1992 Linux Torvalds
22 *
23 * This program is free software; you can redistribute it and/or
24 * modify it under the terms of the GNU General Public
25 * License as published by the Free Software Foundation; either
26 * version 2 of the License, or (at your option) any later version.
27 *
28 * This program is distributed in the hope that it will be useful,
29 * but WITHOUT ANY WARRANTY; without even the implied warranty of
30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
31 * General Public License for more details.
32 *
33 * You should have received a copy of the GNU General Public
34 * License along with this program; if not, write to the
35 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
36 * Boston, MA 021110-1307, USA.
37 */
38
39 #include <linux/fs.h>
40 #include <linux/types.h>
41 #include <linux/slab.h>
42 #include <linux/highmem.h>
43
44 #define MLOG_MASK_PREFIX ML_NAMEI
45 #include <cluster/masklog.h>
46
47 #include "ocfs2.h"
48
49 #include "alloc.h"
50 #include "dcache.h"
51 #include "dir.h"
52 #include "dlmglue.h"
53 #include "extent_map.h"
54 #include "file.h"
55 #include "inode.h"
56 #include "journal.h"
57 #include "namei.h"
58 #include "suballoc.h"
59 #include "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 handle = ocfs2_alloc_handle(osb);
314 if (handle == NULL) {
315 status = -ENOMEM;
316 mlog_errno(status);
317 goto leave;
318 }
319
320 status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
321 if (status < 0) {
322 if (status != -ENOENT)
323 mlog_errno(status);
324 goto leave;
325 }
326
327 if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
328 status = -EMLINK;
329 goto leave;
330 }
331
332 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
333 if (!dirfe->i_links_count) {
334 /* can't make a file in a deleted directory. */
335 status = -ENOENT;
336 goto leave;
337 }
338
339 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
340 dentry->d_name.len);
341 if (status)
342 goto leave;
343
344 /* get a spot inside the dir. */
345 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
346 dentry->d_name.name,
347 dentry->d_name.len, &de_bh);
348 if (status < 0) {
349 mlog_errno(status);
350 goto leave;
351 }
352
353 /* reserve an inode spot */
354 status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
355 if (status < 0) {
356 if (status != -ENOSPC)
357 mlog_errno(status);
358 goto leave;
359 }
360
361 /* are we making a directory? If so, reserve a cluster for his
362 * 1st extent. */
363 if (S_ISDIR(mode)) {
364 status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
365 if (status < 0) {
366 if (status != -ENOSPC)
367 mlog_errno(status);
368 goto leave;
369 }
370 }
371
372 handle = ocfs2_start_trans(osb, handle, OCFS2_MKNOD_CREDITS);
373 if (IS_ERR(handle)) {
374 status = PTR_ERR(handle);
375 handle = NULL;
376 mlog_errno(status);
377 goto leave;
378 }
379
380 /* do the real work now. */
381 status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
382 &new_fe_bh, parent_fe_bh, handle,
383 &inode, inode_ac);
384 if (status < 0) {
385 mlog_errno(status);
386 goto leave;
387 }
388
389 if (S_ISDIR(mode)) {
390 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
391 new_fe_bh, data_ac);
392 if (status < 0) {
393 mlog_errno(status);
394 goto leave;
395 }
396
397 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
398 OCFS2_JOURNAL_ACCESS_WRITE);
399 if (status < 0) {
400 mlog_errno(status);
401 goto leave;
402 }
403 le16_add_cpu(&dirfe->i_links_count, 1);
404 status = ocfs2_journal_dirty(handle, parent_fe_bh);
405 if (status < 0) {
406 mlog_errno(status);
407 goto leave;
408 }
409 dir->i_nlink++;
410 }
411
412 status = ocfs2_add_entry(handle, dentry, inode,
413 OCFS2_I(inode)->ip_blkno, parent_fe_bh,
414 de_bh);
415 if (status < 0) {
416 mlog_errno(status);
417 goto leave;
418 }
419
420 insert_inode_hash(inode);
421 dentry->d_op = &ocfs2_dentry_ops;
422 d_instantiate(dentry, inode);
423 status = 0;
424 leave:
425 if (handle)
426 ocfs2_commit_trans(handle);
427
428 if (status == -ENOSPC)
429 mlog(0, "Disk is full\n");
430
431 if (new_fe_bh)
432 brelse(new_fe_bh);
433
434 if (de_bh)
435 brelse(de_bh);
436
437 if (parent_fe_bh)
438 brelse(parent_fe_bh);
439
440 if ((status < 0) && inode)
441 iput(inode);
442
443 if (inode_ac)
444 ocfs2_free_alloc_context(inode_ac);
445
446 if (data_ac)
447 ocfs2_free_alloc_context(data_ac);
448
449 mlog_exit(status);
450
451 return status;
452 }
453
454 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
455 struct inode *dir,
456 struct dentry *dentry, int mode,
457 dev_t dev,
458 struct buffer_head **new_fe_bh,
459 struct buffer_head *parent_fe_bh,
460 struct ocfs2_journal_handle *handle,
461 struct inode **ret_inode,
462 struct ocfs2_alloc_context *inode_ac)
463 {
464 int status = 0;
465 struct ocfs2_dinode *fe = NULL;
466 struct ocfs2_extent_list *fel;
467 u64 fe_blkno = 0;
468 u16 suballoc_bit;
469 struct inode *inode = NULL;
470
471 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
472 (unsigned long)dev, dentry->d_name.len,
473 dentry->d_name.name);
474
475 *new_fe_bh = NULL;
476 *ret_inode = NULL;
477
478 status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
479 &fe_blkno);
480 if (status < 0) {
481 mlog_errno(status);
482 goto leave;
483 }
484
485 inode = new_inode(dir->i_sb);
486 if (IS_ERR(inode)) {
487 status = PTR_ERR(inode);
488 mlog(ML_ERROR, "new_inode failed!\n");
489 goto leave;
490 }
491
492 /* populate as many fields early on as possible - many of
493 * these are used by the support functions here and in
494 * callers. */
495 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
496 OCFS2_I(inode)->ip_blkno = fe_blkno;
497 if (S_ISDIR(mode))
498 inode->i_nlink = 2;
499 else
500 inode->i_nlink = 1;
501 inode->i_mode = mode;
502 spin_lock(&osb->osb_lock);
503 inode->i_generation = osb->s_next_generation++;
504 spin_unlock(&osb->osb_lock);
505
506 *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
507 if (!*new_fe_bh) {
508 status = -EIO;
509 mlog_errno(status);
510 goto leave;
511 }
512 ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
513
514 status = ocfs2_journal_access(handle, inode, *new_fe_bh,
515 OCFS2_JOURNAL_ACCESS_CREATE);
516 if (status < 0) {
517 mlog_errno(status);
518 goto leave;
519 }
520
521 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
522 memset(fe, 0, osb->sb->s_blocksize);
523
524 fe->i_generation = cpu_to_le32(inode->i_generation);
525 fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
526 fe->i_blkno = cpu_to_le64(fe_blkno);
527 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
528 fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
529 fe->i_uid = cpu_to_le32(current->fsuid);
530 if (dir->i_mode & S_ISGID) {
531 fe->i_gid = cpu_to_le32(dir->i_gid);
532 if (S_ISDIR(mode))
533 mode |= S_ISGID;
534 } else
535 fe->i_gid = cpu_to_le32(current->fsgid);
536 fe->i_mode = cpu_to_le16(mode);
537 if (S_ISCHR(mode) || S_ISBLK(mode))
538 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
539
540 fe->i_links_count = cpu_to_le16(inode->i_nlink);
541
542 fe->i_last_eb_blk = 0;
543 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
544 le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
545 fe->i_atime = fe->i_ctime = fe->i_mtime =
546 cpu_to_le64(CURRENT_TIME.tv_sec);
547 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
548 cpu_to_le32(CURRENT_TIME.tv_nsec);
549 fe->i_dtime = 0;
550
551 fel = &fe->id2.i_list;
552 fel->l_tree_depth = 0;
553 fel->l_next_free_rec = 0;
554 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
555
556 status = ocfs2_journal_dirty(handle, *new_fe_bh);
557 if (status < 0) {
558 mlog_errno(status);
559 goto leave;
560 }
561
562 if (ocfs2_populate_inode(inode, fe, 1) < 0) {
563 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
564 "i_blkno=%llu, i_ino=%lu\n",
565 (unsigned long long) (*new_fe_bh)->b_blocknr,
566 (unsigned long long)fe->i_blkno, inode->i_ino);
567 BUG();
568 }
569
570 ocfs2_inode_set_new(osb, inode);
571 status = ocfs2_create_new_inode_locks(inode);
572 if (status < 0)
573 mlog_errno(status);
574
575 status = 0; /* error in ocfs2_create_new_inode_locks is not
576 * critical */
577
578 *ret_inode = inode;
579 leave:
580 if (status < 0) {
581 if (*new_fe_bh) {
582 brelse(*new_fe_bh);
583 *new_fe_bh = NULL;
584 }
585 if (inode)
586 iput(inode);
587 }
588
589 mlog_exit(status);
590 return status;
591 }
592
593 static int ocfs2_mkdir(struct inode *dir,
594 struct dentry *dentry,
595 int mode)
596 {
597 int ret;
598
599 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
600 dentry->d_name.len, dentry->d_name.name);
601 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
602 mlog_exit(ret);
603
604 return ret;
605 }
606
607 static int ocfs2_create(struct inode *dir,
608 struct dentry *dentry,
609 int mode,
610 struct nameidata *nd)
611 {
612 int ret;
613
614 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
615 dentry->d_name.len, dentry->d_name.name);
616 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
617 mlog_exit(ret);
618
619 return ret;
620 }
621
622 static int ocfs2_link(struct dentry *old_dentry,
623 struct inode *dir,
624 struct dentry *dentry)
625 {
626 struct ocfs2_journal_handle *handle = NULL;
627 struct inode *inode = old_dentry->d_inode;
628 int err;
629 struct buffer_head *fe_bh = NULL;
630 struct buffer_head *parent_fe_bh = NULL;
631 struct buffer_head *de_bh = NULL;
632 struct ocfs2_dinode *fe = NULL;
633 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
634
635 mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
636 old_dentry->d_name.len, old_dentry->d_name.name,
637 dentry->d_name.len, dentry->d_name.name);
638
639 if (S_ISDIR(inode->i_mode)) {
640 err = -EPERM;
641 goto bail;
642 }
643
644 if (inode->i_nlink >= OCFS2_LINK_MAX) {
645 err = -EMLINK;
646 goto bail;
647 }
648
649 handle = ocfs2_alloc_handle(osb);
650 if (handle == NULL) {
651 err = -ENOMEM;
652 goto bail;
653 }
654
655 err = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
656 if (err < 0) {
657 if (err != -ENOENT)
658 mlog_errno(err);
659 goto bail;
660 }
661
662 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
663 dentry->d_name.len);
664 if (err)
665 goto bail;
666
667 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
668 dentry->d_name.name,
669 dentry->d_name.len, &de_bh);
670 if (err < 0) {
671 mlog_errno(err);
672 goto bail;
673 }
674
675 err = ocfs2_meta_lock(inode, handle, &fe_bh, 1);
676 if (err < 0) {
677 if (err != -ENOENT)
678 mlog_errno(err);
679 goto bail;
680 }
681
682 fe = (struct ocfs2_dinode *) fe_bh->b_data;
683 if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
684 err = -EMLINK;
685 goto bail;
686 }
687
688 handle = ocfs2_start_trans(osb, handle, OCFS2_LINK_CREDITS);
689 if (IS_ERR(handle)) {
690 err = PTR_ERR(handle);
691 handle = NULL;
692 mlog_errno(err);
693 goto bail;
694 }
695
696 err = ocfs2_journal_access(handle, inode, fe_bh,
697 OCFS2_JOURNAL_ACCESS_WRITE);
698 if (err < 0) {
699 mlog_errno(err);
700 goto bail;
701 }
702
703 inode->i_nlink++;
704 inode->i_ctime = CURRENT_TIME;
705 fe->i_links_count = cpu_to_le16(inode->i_nlink);
706 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
707 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
708
709 err = ocfs2_journal_dirty(handle, fe_bh);
710 if (err < 0) {
711 le16_add_cpu(&fe->i_links_count, -1);
712 inode->i_nlink--;
713 mlog_errno(err);
714 goto bail;
715 }
716
717 err = ocfs2_add_entry(handle, dentry, inode,
718 OCFS2_I(inode)->ip_blkno,
719 parent_fe_bh, de_bh);
720 if (err) {
721 le16_add_cpu(&fe->i_links_count, -1);
722 inode->i_nlink--;
723 mlog_errno(err);
724 goto bail;
725 }
726
727 atomic_inc(&inode->i_count);
728 dentry->d_op = &ocfs2_dentry_ops;
729 d_instantiate(dentry, inode);
730 bail:
731 if (handle)
732 ocfs2_commit_trans(handle);
733 if (de_bh)
734 brelse(de_bh);
735 if (fe_bh)
736 brelse(fe_bh);
737 if (parent_fe_bh)
738 brelse(parent_fe_bh);
739
740 mlog_exit(err);
741
742 return err;
743 }
744
745 static int ocfs2_unlink(struct inode *dir,
746 struct dentry *dentry)
747 {
748 int status;
749 unsigned int saved_nlink = 0;
750 struct inode *inode = dentry->d_inode;
751 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
752 u64 blkno;
753 struct ocfs2_dinode *fe = NULL;
754 struct buffer_head *fe_bh = NULL;
755 struct buffer_head *parent_node_bh = NULL;
756 struct ocfs2_journal_handle *handle = NULL;
757 struct ocfs2_dir_entry *dirent = NULL;
758 struct buffer_head *dirent_bh = NULL;
759 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
760 struct buffer_head *orphan_entry_bh = NULL;
761
762 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
763 dentry->d_name.len, dentry->d_name.name);
764
765 BUG_ON(dentry->d_parent->d_inode != dir);
766
767 mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
768
769 if (inode == osb->root_inode) {
770 mlog(0, "Cannot delete the root directory\n");
771 status = -EPERM;
772 goto leave;
773 }
774
775 handle = ocfs2_alloc_handle(osb);
776 if (handle == NULL) {
777 status = -ENOMEM;
778 mlog_errno(status);
779 goto leave;
780 }
781
782 status = ocfs2_meta_lock(dir, handle, &parent_node_bh, 1);
783 if (status < 0) {
784 if (status != -ENOENT)
785 mlog_errno(status);
786 goto leave;
787 }
788
789 status = ocfs2_find_files_on_disk(dentry->d_name.name,
790 dentry->d_name.len, &blkno,
791 dir, &dirent_bh, &dirent);
792 if (status < 0) {
793 if (status != -ENOENT)
794 mlog_errno(status);
795 goto leave;
796 }
797
798 if (OCFS2_I(inode)->ip_blkno != blkno) {
799 status = -ENOENT;
800
801 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
802 (unsigned long long)OCFS2_I(inode)->ip_blkno,
803 (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
804 goto leave;
805 }
806
807 status = ocfs2_meta_lock(inode, handle, &fe_bh, 1);
808 if (status < 0) {
809 if (status != -ENOENT)
810 mlog_errno(status);
811 goto leave;
812 }
813
814 if (S_ISDIR(inode->i_mode)) {
815 if (!ocfs2_empty_dir(inode)) {
816 status = -ENOTEMPTY;
817 goto leave;
818 } else if (inode->i_nlink != 2) {
819 status = -ENOTEMPTY;
820 goto leave;
821 }
822 }
823
824 /* There are still a few steps left until we can consider the
825 * unlink to have succeeded. Save off nlink here before
826 * modification so we can set it back in case we hit an issue
827 * before commit. */
828 saved_nlink = inode->i_nlink;
829 if (S_ISDIR(inode->i_mode))
830 inode->i_nlink = 0;
831 else
832 inode->i_nlink--;
833
834 status = ocfs2_request_unlink_vote(inode, dentry,
835 (unsigned int) inode->i_nlink);
836 if (status < 0) {
837 /* This vote should succeed under all normal
838 * circumstances. */
839 mlog_errno(status);
840 goto leave;
841 }
842
843 if (!inode->i_nlink) {
844 status = ocfs2_prepare_orphan_dir(osb, handle, inode,
845 orphan_name,
846 &orphan_entry_bh);
847 if (status < 0) {
848 mlog_errno(status);
849 goto leave;
850 }
851 }
852
853 handle = ocfs2_start_trans(osb, handle, OCFS2_UNLINK_CREDITS);
854 if (IS_ERR(handle)) {
855 status = PTR_ERR(handle);
856 handle = NULL;
857 mlog_errno(status);
858 goto leave;
859 }
860
861 status = ocfs2_journal_access(handle, inode, fe_bh,
862 OCFS2_JOURNAL_ACCESS_WRITE);
863 if (status < 0) {
864 mlog_errno(status);
865 goto leave;
866 }
867
868 fe = (struct ocfs2_dinode *) fe_bh->b_data;
869
870 if (!inode->i_nlink) {
871 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
872 orphan_entry_bh);
873 if (status < 0) {
874 mlog_errno(status);
875 goto leave;
876 }
877 }
878
879 /* delete the name from the parent dir */
880 status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
881 if (status < 0) {
882 mlog_errno(status);
883 goto leave;
884 }
885
886 /* We can set nlink on the dinode now. clear the saved version
887 * so that it doesn't get set later. */
888 fe->i_links_count = cpu_to_le16(inode->i_nlink);
889 saved_nlink = 0;
890
891 status = ocfs2_journal_dirty(handle, fe_bh);
892 if (status < 0) {
893 mlog_errno(status);
894 goto leave;
895 }
896
897 if (S_ISDIR(inode->i_mode)) {
898 dir->i_nlink--;
899 status = ocfs2_mark_inode_dirty(handle, dir,
900 parent_node_bh);
901 if (status < 0) {
902 mlog_errno(status);
903 dir->i_nlink++;
904 }
905 }
906
907 leave:
908 if (status < 0 && saved_nlink)
909 inode->i_nlink = saved_nlink;
910
911 if (handle)
912 ocfs2_commit_trans(handle);
913
914 if (fe_bh)
915 brelse(fe_bh);
916
917 if (dirent_bh)
918 brelse(dirent_bh);
919
920 if (parent_node_bh)
921 brelse(parent_node_bh);
922
923 if (orphan_entry_bh)
924 brelse(orphan_entry_bh);
925
926 mlog_exit(status);
927
928 return status;
929 }
930
931 /*
932 * The only place this should be used is rename!
933 * if they have the same id, then the 1st one is the only one locked.
934 */
935 static int ocfs2_double_lock(struct ocfs2_super *osb,
936 struct ocfs2_journal_handle *handle,
937 struct buffer_head **bh1,
938 struct inode *inode1,
939 struct buffer_head **bh2,
940 struct inode *inode2)
941 {
942 int status;
943 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
944 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
945 struct buffer_head **tmpbh;
946 struct inode *tmpinode;
947
948 mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
949 (unsigned long long)oi1->ip_blkno,
950 (unsigned long long)oi2->ip_blkno);
951
952 BUG_ON(!handle);
953
954 if (*bh1)
955 *bh1 = NULL;
956 if (*bh2)
957 *bh2 = NULL;
958
959 /* we always want to lock the one with the lower lockid first. */
960 if (oi1->ip_blkno != oi2->ip_blkno) {
961 if (oi1->ip_blkno < oi2->ip_blkno) {
962 /* switch id1 and id2 around */
963 mlog(0, "switching them around...\n");
964 tmpbh = bh2;
965 bh2 = bh1;
966 bh1 = tmpbh;
967
968 tmpinode = inode2;
969 inode2 = inode1;
970 inode1 = tmpinode;
971 }
972 /* lock id2 */
973 status = ocfs2_meta_lock(inode2, handle, bh2, 1);
974 if (status < 0) {
975 if (status != -ENOENT)
976 mlog_errno(status);
977 goto bail;
978 }
979 }
980 /* lock id1 */
981 status = ocfs2_meta_lock(inode1, handle, bh1, 1);
982 if (status < 0) {
983 if (status != -ENOENT)
984 mlog_errno(status);
985 goto bail;
986 }
987 bail:
988 mlog_exit(status);
989 return status;
990 }
991
992 #define PARENT_INO(buffer) \
993 ((struct ocfs2_dir_entry *) \
994 ((char *)buffer + \
995 le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode
996
997 static int ocfs2_rename(struct inode *old_dir,
998 struct dentry *old_dentry,
999 struct inode *new_dir,
1000 struct dentry *new_dentry)
1001 {
1002 int status = 0, rename_lock = 0;
1003 struct inode *old_inode = old_dentry->d_inode;
1004 struct inode *new_inode = new_dentry->d_inode;
1005 struct ocfs2_dinode *newfe = NULL;
1006 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1007 struct buffer_head *orphan_entry_bh = NULL;
1008 struct buffer_head *newfe_bh = NULL;
1009 struct buffer_head *insert_entry_bh = NULL;
1010 struct ocfs2_super *osb = NULL;
1011 u64 newfe_blkno;
1012 struct ocfs2_journal_handle *handle = NULL;
1013 struct buffer_head *old_dir_bh = NULL;
1014 struct buffer_head *new_dir_bh = NULL;
1015 struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry
1016 // and new_dentry
1017 struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
1018 struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
1019 // this is the 1st dirent bh
1020 nlink_t old_dir_nlink = old_dir->i_nlink, new_dir_nlink = new_dir->i_nlink;
1021 unsigned int links_count;
1022
1023 /* At some point it might be nice to break this function up a
1024 * bit. */
1025
1026 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
1027 old_dir, old_dentry, new_dir, new_dentry,
1028 old_dentry->d_name.len, old_dentry->d_name.name,
1029 new_dentry->d_name.len, new_dentry->d_name.name);
1030
1031 osb = OCFS2_SB(old_dir->i_sb);
1032
1033 if (new_inode) {
1034 if (!igrab(new_inode))
1035 BUG();
1036 }
1037
1038 if (atomic_read(&old_dentry->d_count) > 2) {
1039 shrink_dcache_parent(old_dentry);
1040 if (atomic_read(&old_dentry->d_count) > 2) {
1041 status = -EBUSY;
1042 goto bail;
1043 }
1044 }
1045
1046 /* Assume a directory heirarchy thusly:
1047 * a/b/c
1048 * a/d
1049 * a,b,c, and d are all directories.
1050 *
1051 * from cwd of 'a' on both nodes:
1052 * node1: mv b/c d
1053 * node2: mv d b/c
1054 *
1055 * And that's why, just like the VFS, we need a file system
1056 * rename lock. */
1057 if (old_dentry != new_dentry) {
1058 status = ocfs2_rename_lock(osb);
1059 if (status < 0) {
1060 mlog_errno(status);
1061 goto bail;
1062 }
1063 rename_lock = 1;
1064 }
1065
1066 handle = ocfs2_alloc_handle(osb);
1067 if (handle == NULL) {
1068 status = -ENOMEM;
1069 mlog_errno(status);
1070 goto bail;
1071 }
1072
1073 /* if old and new are the same, this'll just do one lock. */
1074 status = ocfs2_double_lock(osb, handle,
1075 &old_dir_bh, old_dir,
1076 &new_dir_bh, new_dir);
1077 if (status < 0) {
1078 mlog_errno(status);
1079 goto bail;
1080 }
1081
1082 /* make sure both dirs have bhs
1083 * get an extra ref on old_dir_bh if old==new */
1084 if (!new_dir_bh) {
1085 if (old_dir_bh) {
1086 new_dir_bh = old_dir_bh;
1087 get_bh(new_dir_bh);
1088 } else {
1089 mlog(ML_ERROR, "no old_dir_bh!\n");
1090 status = -EIO;
1091 goto bail;
1092 }
1093 }
1094
1095 if (S_ISDIR(old_inode->i_mode)) {
1096 /* Directories actually require metadata updates to
1097 * the directory info so we can't get away with not
1098 * doing node locking on it. */
1099 status = ocfs2_meta_lock(old_inode, handle, NULL, 1);
1100 if (status < 0) {
1101 if (status != -ENOENT)
1102 mlog_errno(status);
1103 goto bail;
1104 }
1105
1106 status = ocfs2_request_rename_vote(old_inode, old_dentry);
1107 if (status < 0) {
1108 mlog_errno(status);
1109 goto bail;
1110 }
1111
1112 status = -EIO;
1113 old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0);
1114 if (!old_inode_de_bh)
1115 goto bail;
1116
1117 status = -EIO;
1118 if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) !=
1119 OCFS2_I(old_dir)->ip_blkno)
1120 goto bail;
1121 status = -EMLINK;
1122 if (!new_inode && new_dir!=old_dir &&
1123 new_dir->i_nlink >= OCFS2_LINK_MAX)
1124 goto bail;
1125 } else {
1126 /* Ah, the simple case - we're a file so just send a
1127 * message. */
1128 status = ocfs2_request_rename_vote(old_inode, old_dentry);
1129 if (status < 0) {
1130 mlog_errno(status);
1131 goto bail;
1132 }
1133 }
1134
1135 status = -ENOENT;
1136 old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1137 old_dentry->d_name.len,
1138 old_dir, &old_de);
1139 if (!old_de_bh)
1140 goto bail;
1141
1142 /*
1143 * Check for inode number is _not_ due to possible IO errors.
1144 * We might rmdir the source, keep it as pwd of some process
1145 * and merrily kill the link to whatever was created under the
1146 * same name. Goodbye sticky bit ;-<
1147 */
1148 if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno)
1149 goto bail;
1150
1151 /* check if the target already exists (in which case we need
1152 * to delete it */
1153 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1154 new_dentry->d_name.len,
1155 &newfe_blkno, new_dir, &new_de_bh,
1156 &new_de);
1157 /* The only error we allow here is -ENOENT because the new
1158 * file not existing is perfectly valid. */
1159 if ((status < 0) && (status != -ENOENT)) {
1160 /* If we cannot find the file specified we should just */
1161 /* return the error... */
1162 mlog_errno(status);
1163 goto bail;
1164 }
1165
1166 if (!new_de && new_inode)
1167 mlog(ML_ERROR, "inode %lu does not exist in it's parent "
1168 "directory!", new_inode->i_ino);
1169
1170 /* In case we need to overwrite an existing file, we blow it
1171 * away first */
1172 if (new_de) {
1173 /* VFS didn't think there existed an inode here, but
1174 * someone else in the cluster must have raced our
1175 * rename to create one. Today we error cleanly, in
1176 * the future we should consider calling iget to build
1177 * a new struct inode for this entry. */
1178 if (!new_inode) {
1179 status = -EACCES;
1180
1181 mlog(0, "We found an inode for name %.*s but VFS "
1182 "didn't give us one.\n", new_dentry->d_name.len,
1183 new_dentry->d_name.name);
1184 goto bail;
1185 }
1186
1187 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1188 status = -EACCES;
1189
1190 mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1191 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1192 (unsigned long long)newfe_blkno,
1193 OCFS2_I(new_inode)->ip_flags);
1194 goto bail;
1195 }
1196
1197 status = ocfs2_meta_lock(new_inode, handle, &newfe_bh, 1);
1198 if (status < 0) {
1199 if (status != -ENOENT)
1200 mlog_errno(status);
1201 goto bail;
1202 }
1203
1204 if (S_ISDIR(new_inode->i_mode))
1205 links_count = 0;
1206 else
1207 links_count = (unsigned int) (new_inode->i_nlink - 1);
1208
1209 status = ocfs2_request_unlink_vote(new_inode, new_dentry,
1210 links_count);
1211 if (status < 0) {
1212 mlog_errno(status);
1213 goto bail;
1214 }
1215
1216 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1217
1218 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1219 "newfebh=%p bhblocknr=%llu\n", new_de,
1220 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1221 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1222
1223 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1224 status = ocfs2_prepare_orphan_dir(osb, handle,
1225 new_inode,
1226 orphan_name,
1227 &orphan_entry_bh);
1228 if (status < 0) {
1229 mlog_errno(status);
1230 goto bail;
1231 }
1232 }
1233 } else {
1234 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1235
1236 status = ocfs2_check_dir_for_entry(new_dir,
1237 new_dentry->d_name.name,
1238 new_dentry->d_name.len);
1239 if (status)
1240 goto bail;
1241
1242 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1243 new_dentry->d_name.name,
1244 new_dentry->d_name.len,
1245 &insert_entry_bh);
1246 if (status < 0) {
1247 mlog_errno(status);
1248 goto bail;
1249 }
1250 }
1251
1252 handle = ocfs2_start_trans(osb, handle, OCFS2_RENAME_CREDITS);
1253 if (IS_ERR(handle)) {
1254 status = PTR_ERR(handle);
1255 handle = NULL;
1256 mlog_errno(status);
1257 goto bail;
1258 }
1259
1260 if (new_de) {
1261 if (S_ISDIR(new_inode->i_mode)) {
1262 if (!ocfs2_empty_dir(new_inode) ||
1263 new_inode->i_nlink != 2) {
1264 status = -ENOTEMPTY;
1265 goto bail;
1266 }
1267 }
1268 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1269 OCFS2_JOURNAL_ACCESS_WRITE);
1270 if (status < 0) {
1271 mlog_errno(status);
1272 goto bail;
1273 }
1274
1275 if (S_ISDIR(new_inode->i_mode) ||
1276 (newfe->i_links_count == cpu_to_le16(1))){
1277 status = ocfs2_orphan_add(osb, handle, new_inode,
1278 newfe, orphan_name,
1279 orphan_entry_bh);
1280 if (status < 0) {
1281 mlog_errno(status);
1282 goto bail;
1283 }
1284 }
1285
1286 /* change the dirent to point to the correct inode */
1287 status = ocfs2_journal_access(handle, new_dir, new_de_bh,
1288 OCFS2_JOURNAL_ACCESS_WRITE);
1289 if (status < 0) {
1290 mlog_errno(status);
1291 goto bail;
1292 }
1293 new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno);
1294 new_de->file_type = old_de->file_type;
1295 new_dir->i_version++;
1296 status = ocfs2_journal_dirty(handle, new_de_bh);
1297 if (status < 0) {
1298 mlog_errno(status);
1299 goto bail;
1300 }
1301
1302 if (S_ISDIR(new_inode->i_mode))
1303 newfe->i_links_count = 0;
1304 else
1305 le16_add_cpu(&newfe->i_links_count, -1);
1306
1307 status = ocfs2_journal_dirty(handle, newfe_bh);
1308 if (status < 0) {
1309 mlog_errno(status);
1310 goto bail;
1311 }
1312 } else {
1313 /* if the name was not found in new_dir, add it now */
1314 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1315 OCFS2_I(old_inode)->ip_blkno,
1316 new_dir_bh, insert_entry_bh);
1317 }
1318
1319 old_inode->i_ctime = CURRENT_TIME;
1320 mark_inode_dirty(old_inode);
1321
1322 /* now that the name has been added to new_dir, remove the old name */
1323 status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1324 if (status < 0) {
1325 mlog_errno(status);
1326 goto bail;
1327 }
1328
1329 if (new_inode) {
1330 new_inode->i_nlink--;
1331 new_inode->i_ctime = CURRENT_TIME;
1332 }
1333 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1334 if (old_inode_de_bh) {
1335 status = ocfs2_journal_access(handle, old_inode,
1336 old_inode_de_bh,
1337 OCFS2_JOURNAL_ACCESS_WRITE);
1338 PARENT_INO(old_inode_de_bh->b_data) =
1339 cpu_to_le64(OCFS2_I(new_dir)->ip_blkno);
1340 status = ocfs2_journal_dirty(handle, old_inode_de_bh);
1341 old_dir->i_nlink--;
1342 if (new_inode) {
1343 new_inode->i_nlink--;
1344 } else {
1345 new_dir->i_nlink++;
1346 mark_inode_dirty(new_dir);
1347 }
1348 }
1349 mark_inode_dirty(old_dir);
1350 if (new_inode)
1351 mark_inode_dirty(new_inode);
1352
1353 if (old_dir != new_dir)
1354 if (new_dir_nlink != new_dir->i_nlink) {
1355 if (!new_dir_bh) {
1356 mlog(ML_ERROR, "need to change nlink for new "
1357 "dir %llu from %d to %d but bh is NULL\n",
1358 (unsigned long long)OCFS2_I(new_dir)->ip_blkno,
1359 (int)new_dir_nlink, new_dir->i_nlink);
1360 } else {
1361 struct ocfs2_dinode *fe;
1362 status = ocfs2_journal_access(handle,
1363 new_dir,
1364 new_dir_bh,
1365 OCFS2_JOURNAL_ACCESS_WRITE);
1366 fe = (struct ocfs2_dinode *) new_dir_bh->b_data;
1367 fe->i_links_count = cpu_to_le16(new_dir->i_nlink);
1368 status = ocfs2_journal_dirty(handle, new_dir_bh);
1369 }
1370 }
1371
1372 if (old_dir_nlink != old_dir->i_nlink) {
1373 if (!old_dir_bh) {
1374 mlog(ML_ERROR, "need to change nlink for old dir "
1375 "%llu from %d to %d but bh is NULL!\n",
1376 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1377 (int)old_dir_nlink, old_dir->i_nlink);
1378 } else {
1379 struct ocfs2_dinode *fe;
1380 status = ocfs2_journal_access(handle, old_dir,
1381 old_dir_bh,
1382 OCFS2_JOURNAL_ACCESS_WRITE);
1383 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1384 fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1385 status = ocfs2_journal_dirty(handle, old_dir_bh);
1386 }
1387 }
1388
1389 status = 0;
1390 bail:
1391 if (rename_lock)
1392 ocfs2_rename_unlock(osb);
1393
1394 if (handle)
1395 ocfs2_commit_trans(handle);
1396
1397 if (new_inode)
1398 sync_mapping_buffers(old_inode->i_mapping);
1399
1400 if (new_inode)
1401 iput(new_inode);
1402 if (newfe_bh)
1403 brelse(newfe_bh);
1404 if (old_dir_bh)
1405 brelse(old_dir_bh);
1406 if (new_dir_bh)
1407 brelse(new_dir_bh);
1408 if (new_de_bh)
1409 brelse(new_de_bh);
1410 if (old_de_bh)
1411 brelse(old_de_bh);
1412 if (old_inode_de_bh)
1413 brelse(old_inode_de_bh);
1414 if (orphan_entry_bh)
1415 brelse(orphan_entry_bh);
1416 if (insert_entry_bh)
1417 brelse(insert_entry_bh);
1418
1419 mlog_exit(status);
1420
1421 return status;
1422 }
1423
1424 /*
1425 * we expect i_size = strlen(symname). Copy symname into the file
1426 * data, including the null terminator.
1427 */
1428 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1429 struct ocfs2_journal_handle *handle,
1430 struct inode *inode,
1431 const char *symname)
1432 {
1433 struct buffer_head **bhs = NULL;
1434 const char *c;
1435 struct super_block *sb = osb->sb;
1436 u64 p_blkno;
1437 int p_blocks;
1438 int virtual, blocks, status, i, bytes_left;
1439
1440 bytes_left = i_size_read(inode) + 1;
1441 /* we can't trust i_blocks because we're actually going to
1442 * write i_size + 1 bytes. */
1443 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1444
1445 mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1446 (unsigned long long)inode->i_blocks,
1447 i_size_read(inode), blocks);
1448
1449 /* Sanity check -- make sure we're going to fit. */
1450 if (bytes_left >
1451 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1452 status = -EIO;
1453 mlog_errno(status);
1454 goto bail;
1455 }
1456
1457 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1458 if (!bhs) {
1459 status = -ENOMEM;
1460 mlog_errno(status);
1461 goto bail;
1462 }
1463
1464 status = ocfs2_extent_map_get_blocks(inode, 0, 1, &p_blkno,
1465 &p_blocks);
1466 if (status < 0) {
1467 mlog_errno(status);
1468 goto bail;
1469 }
1470
1471 /* links can never be larger than one cluster so we know this
1472 * is all going to be contiguous, but do a sanity check
1473 * anyway. */
1474 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1475 status = -EIO;
1476 mlog_errno(status);
1477 goto bail;
1478 }
1479
1480 virtual = 0;
1481 while(bytes_left > 0) {
1482 c = &symname[virtual * sb->s_blocksize];
1483
1484 bhs[virtual] = sb_getblk(sb, p_blkno);
1485 if (!bhs[virtual]) {
1486 status = -ENOMEM;
1487 mlog_errno(status);
1488 goto bail;
1489 }
1490 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1491
1492 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1493 OCFS2_JOURNAL_ACCESS_CREATE);
1494 if (status < 0) {
1495 mlog_errno(status);
1496 goto bail;
1497 }
1498
1499 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1500
1501 memcpy(bhs[virtual]->b_data, c,
1502 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1503 bytes_left);
1504
1505 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1506 if (status < 0) {
1507 mlog_errno(status);
1508 goto bail;
1509 }
1510
1511 virtual++;
1512 p_blkno++;
1513 bytes_left -= sb->s_blocksize;
1514 }
1515
1516 status = 0;
1517 bail:
1518
1519 if (bhs) {
1520 for(i = 0; i < blocks; i++)
1521 if (bhs[i])
1522 brelse(bhs[i]);
1523 kfree(bhs);
1524 }
1525
1526 mlog_exit(status);
1527 return status;
1528 }
1529
1530 static int ocfs2_symlink(struct inode *dir,
1531 struct dentry *dentry,
1532 const char *symname)
1533 {
1534 int status, l, credits;
1535 u64 newsize;
1536 struct ocfs2_super *osb = NULL;
1537 struct inode *inode = NULL;
1538 struct super_block *sb;
1539 struct buffer_head *new_fe_bh = NULL;
1540 struct buffer_head *de_bh = NULL;
1541 struct buffer_head *parent_fe_bh = NULL;
1542 struct ocfs2_dinode *fe = NULL;
1543 struct ocfs2_dinode *dirfe;
1544 struct ocfs2_journal_handle *handle = NULL;
1545 struct ocfs2_alloc_context *inode_ac = NULL;
1546 struct ocfs2_alloc_context *data_ac = NULL;
1547
1548 mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1549 dentry, symname, dentry->d_name.len, dentry->d_name.name);
1550
1551 sb = dir->i_sb;
1552 osb = OCFS2_SB(sb);
1553
1554 l = strlen(symname) + 1;
1555
1556 credits = ocfs2_calc_symlink_credits(sb);
1557
1558 handle = ocfs2_alloc_handle(osb);
1559 if (handle == NULL) {
1560 status = -ENOMEM;
1561 mlog_errno(status);
1562 goto bail;
1563 }
1564
1565 /* lock the parent directory */
1566 status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
1567 if (status < 0) {
1568 if (status != -ENOENT)
1569 mlog_errno(status);
1570 goto bail;
1571 }
1572
1573 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1574 if (!dirfe->i_links_count) {
1575 /* can't make a file in a deleted directory. */
1576 status = -ENOENT;
1577 goto bail;
1578 }
1579
1580 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1581 dentry->d_name.len);
1582 if (status)
1583 goto bail;
1584
1585 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1586 dentry->d_name.name,
1587 dentry->d_name.len, &de_bh);
1588 if (status < 0) {
1589 mlog_errno(status);
1590 goto bail;
1591 }
1592
1593 status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
1594 if (status < 0) {
1595 if (status != -ENOSPC)
1596 mlog_errno(status);
1597 goto bail;
1598 }
1599
1600 /* don't reserve bitmap space for fast symlinks. */
1601 if (l > ocfs2_fast_symlink_chars(sb)) {
1602 status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
1603 if (status < 0) {
1604 if (status != -ENOSPC)
1605 mlog_errno(status);
1606 goto bail;
1607 }
1608 }
1609
1610 handle = ocfs2_start_trans(osb, handle, credits);
1611 if (IS_ERR(handle)) {
1612 status = PTR_ERR(handle);
1613 handle = NULL;
1614 mlog_errno(status);
1615 goto bail;
1616 }
1617
1618 status = ocfs2_mknod_locked(osb, dir, dentry,
1619 S_IFLNK | S_IRWXUGO, 0,
1620 &new_fe_bh, parent_fe_bh, handle,
1621 &inode, inode_ac);
1622 if (status < 0) {
1623 mlog_errno(status);
1624 goto bail;
1625 }
1626
1627 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1628 inode->i_rdev = 0;
1629 newsize = l - 1;
1630 if (l > ocfs2_fast_symlink_chars(sb)) {
1631 inode->i_op = &ocfs2_symlink_inode_operations;
1632 status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh,
1633 handle, data_ac, NULL,
1634 NULL);
1635 if (status < 0) {
1636 if (status != -ENOSPC && status != -EINTR) {
1637 mlog(ML_ERROR,
1638 "Failed to extend file to %llu\n",
1639 (unsigned long long)newsize);
1640 mlog_errno(status);
1641 status = -ENOSPC;
1642 }
1643 goto bail;
1644 }
1645 i_size_write(inode, newsize);
1646 inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize);
1647 } else {
1648 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1649 memcpy((char *) fe->id2.i_symlink, symname, l);
1650 i_size_write(inode, newsize);
1651 inode->i_blocks = 0;
1652 }
1653
1654 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1655 if (status < 0) {
1656 mlog_errno(status);
1657 goto bail;
1658 }
1659
1660 if (!ocfs2_inode_is_fast_symlink(inode)) {
1661 status = ocfs2_create_symlink_data(osb, handle, inode,
1662 symname);
1663 if (status < 0) {
1664 mlog_errno(status);
1665 goto bail;
1666 }
1667 }
1668
1669 status = ocfs2_add_entry(handle, dentry, inode,
1670 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1671 de_bh);
1672 if (status < 0) {
1673 mlog_errno(status);
1674 goto bail;
1675 }
1676
1677 insert_inode_hash(inode);
1678 dentry->d_op = &ocfs2_dentry_ops;
1679 d_instantiate(dentry, inode);
1680 bail:
1681 if (handle)
1682 ocfs2_commit_trans(handle);
1683 if (new_fe_bh)
1684 brelse(new_fe_bh);
1685 if (parent_fe_bh)
1686 brelse(parent_fe_bh);
1687 if (de_bh)
1688 brelse(de_bh);
1689 if (inode_ac)
1690 ocfs2_free_alloc_context(inode_ac);
1691 if (data_ac)
1692 ocfs2_free_alloc_context(data_ac);
1693 if ((status < 0) && inode)
1694 iput(inode);
1695
1696 mlog_exit(status);
1697
1698 return status;
1699 }
1700
1701 int ocfs2_check_dir_entry(struct inode * dir,
1702 struct ocfs2_dir_entry * de,
1703 struct buffer_head * bh,
1704 unsigned long offset)
1705 {
1706 const char *error_msg = NULL;
1707 const int rlen = le16_to_cpu(de->rec_len);
1708
1709 if (rlen < OCFS2_DIR_REC_LEN(1))
1710 error_msg = "rec_len is smaller than minimal";
1711 else if (rlen % 4 != 0)
1712 error_msg = "rec_len % 4 != 0";
1713 else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
1714 error_msg = "rec_len is too small for name_len";
1715 else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
1716 error_msg = "directory entry across blocks";
1717
1718 if (error_msg != NULL)
1719 mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
1720 "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
1721 (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
1722 offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
1723 de->name_len);
1724 return error_msg == NULL ? 1 : 0;
1725 }
1726
1727 /* we don't always have a dentry for what we want to add, so people
1728 * like orphan dir can call this instead.
1729 *
1730 * If you pass me insert_bh, I'll skip the search of the other dir
1731 * blocks and put the record in there.
1732 */
1733 static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle,
1734 struct inode *dir,
1735 const char *name, int namelen,
1736 struct inode *inode, u64 blkno,
1737 struct buffer_head *parent_fe_bh,
1738 struct buffer_head *insert_bh)
1739 {
1740 unsigned long offset;
1741 unsigned short rec_len;
1742 struct ocfs2_dir_entry *de, *de1;
1743 struct super_block *sb;
1744 int retval, status;
1745
1746 mlog_entry_void();
1747
1748 sb = dir->i_sb;
1749
1750 if (!namelen)
1751 return -EINVAL;
1752
1753 rec_len = OCFS2_DIR_REC_LEN(namelen);
1754 offset = 0;
1755 de = (struct ocfs2_dir_entry *) insert_bh->b_data;
1756 while (1) {
1757 BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data);
1758 /* These checks should've already been passed by the
1759 * prepare function, but I guess we can leave them
1760 * here anyway. */
1761 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
1762 retval = -ENOENT;
1763 goto bail;
1764 }
1765 if (ocfs2_match(namelen, name, de)) {
1766 retval = -EEXIST;
1767 goto bail;
1768 }
1769 if (((le64_to_cpu(de->inode) == 0) &&
1770 (le16_to_cpu(de->rec_len) >= rec_len)) ||
1771 (le16_to_cpu(de->rec_len) >=
1772 (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
1773 status = ocfs2_journal_access(handle, dir, insert_bh,
1774 OCFS2_JOURNAL_ACCESS_WRITE);
1775 /* By now the buffer is marked for journaling */
1776 offset += le16_to_cpu(de->rec_len);
1777 if (le64_to_cpu(de->inode)) {
1778 de1 = (struct ocfs2_dir_entry *)((char *) de +
1779 OCFS2_DIR_REC_LEN(de->name_len));
1780 de1->rec_len =
1781 cpu_to_le16(le16_to_cpu(de->rec_len) -
1782 OCFS2_DIR_REC_LEN(de->name_len));
1783 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
1784 de = de1;
1785 }
1786 de->file_type = OCFS2_FT_UNKNOWN;
1787 if (blkno) {
1788 de->inode = cpu_to_le64(blkno);
1789 ocfs2_set_de_type(de, inode->i_mode);
1790 } else
1791 de->inode = 0;
1792 de->name_len = namelen;
1793 memcpy(de->name, name, namelen);
1794
1795 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
1796 dir->i_version++;
1797 status = ocfs2_journal_dirty(handle, insert_bh);
1798 retval = 0;
1799 goto bail;
1800 }
1801 offset += le16_to_cpu(de->rec_len);
1802 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
1803 }
1804
1805 /* when you think about it, the assert above should prevent us
1806 * from ever getting here. */
1807 retval = -ENOSPC;
1808 bail:
1809
1810 mlog_exit(retval);
1811 return retval;
1812 }
1813
1814
1815 /*
1816 * ocfs2_delete_entry deletes a directory entry by merging it with the
1817 * previous entry
1818 */
1819 static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle,
1820 struct inode *dir,
1821 struct ocfs2_dir_entry *de_del,
1822 struct buffer_head *bh)
1823 {
1824 struct ocfs2_dir_entry *de, *pde;
1825 int i, status = -ENOENT;
1826
1827 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
1828
1829 i = 0;
1830 pde = NULL;
1831 de = (struct ocfs2_dir_entry *) bh->b_data;
1832 while (i < bh->b_size) {
1833 if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
1834 status = -EIO;
1835 mlog_errno(status);
1836 goto bail;
1837 }
1838 if (de == de_del) {
1839 status = ocfs2_journal_access(handle, dir, bh,
1840 OCFS2_JOURNAL_ACCESS_WRITE);
1841 if (status < 0) {
1842 status = -EIO;
1843 mlog_errno(status);
1844 goto bail;
1845 }
1846 if (pde)
1847 pde->rec_len =
1848 cpu_to_le16(le16_to_cpu(pde->rec_len) +
1849 le16_to_cpu(de->rec_len));
1850 else
1851 de->inode = 0;
1852 dir->i_version++;
1853 status = ocfs2_journal_dirty(handle, bh);
1854 goto bail;
1855 }
1856 i += le16_to_cpu(de->rec_len);
1857 pde = de;
1858 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
1859 }
1860 bail:
1861 mlog_exit(status);
1862 return status;
1863 }
1864
1865 /*
1866 * Returns 0 if not found, -1 on failure, and 1 on success
1867 */
1868 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
1869 struct inode *dir,
1870 const char *name, int namelen,
1871 unsigned long offset,
1872 struct ocfs2_dir_entry **res_dir)
1873 {
1874 struct ocfs2_dir_entry *de;
1875 char *dlimit, *de_buf;
1876 int de_len;
1877 int ret = 0;
1878
1879 mlog_entry_void();
1880
1881 de_buf = bh->b_data;
1882 dlimit = de_buf + dir->i_sb->s_blocksize;
1883
1884 while (de_buf < dlimit) {
1885 /* this code is executed quadratically often */
1886 /* do minimal checking `by hand' */
1887
1888 de = (struct ocfs2_dir_entry *) de_buf;
1889
1890 if (de_buf + namelen <= dlimit &&
1891 ocfs2_match(namelen, name, de)) {
1892 /* found a match - just to be sure, do a full check */
1893 if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
1894 ret = -1;
1895 goto bail;
1896 }
1897 *res_dir = de;
1898 ret = 1;
1899 goto bail;
1900 }
1901
1902 /* prevent looping on a bad block */
1903 de_len = le16_to_cpu(de->rec_len);
1904 if (de_len <= 0) {
1905 ret = -1;
1906 goto bail;
1907 }
1908
1909 de_buf += de_len;
1910 offset += de_len;
1911 }
1912
1913 bail:
1914 mlog_exit(ret);
1915 return ret;
1916 }
1917
1918 struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
1919 struct inode *dir,
1920 struct ocfs2_dir_entry **res_dir)
1921 {
1922 struct super_block *sb;
1923 struct buffer_head *bh_use[NAMEI_RA_SIZE];
1924 struct buffer_head *bh, *ret = NULL;
1925 unsigned long start, block, b;
1926 int ra_max = 0; /* Number of bh's in the readahead
1927 buffer, bh_use[] */
1928 int ra_ptr = 0; /* Current index into readahead
1929 buffer */
1930 int num = 0;
1931 int nblocks, i, err;
1932
1933 mlog_entry_void();
1934
1935 *res_dir = NULL;
1936 sb = dir->i_sb;
1937
1938 nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
1939 start = OCFS2_I(dir)->ip_dir_start_lookup;
1940 if (start >= nblocks)
1941 start = 0;
1942 block = start;
1943
1944 restart:
1945 do {
1946 /*
1947 * We deal with the read-ahead logic here.
1948 */
1949 if (ra_ptr >= ra_max) {
1950 /* Refill the readahead buffer */
1951 ra_ptr = 0;
1952 b = block;
1953 for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
1954 /*
1955 * Terminate if we reach the end of the
1956 * directory and must wrap, or if our
1957 * search has finished at this block.
1958 */
1959 if (b >= nblocks || (num && block == start)) {
1960 bh_use[ra_max] = NULL;
1961 break;
1962 }
1963 num++;
1964
1965 /* XXX: questionable readahead stuff here */
1966 bh = ocfs2_bread(dir, b++, &err, 1);
1967 bh_use[ra_max] = bh;
1968 #if 0 // ???
1969 if (bh)
1970 ll_rw_block(READ, 1, &bh);
1971 #endif
1972 }
1973 }
1974 if ((bh = bh_use[ra_ptr++]) == NULL)
1975 goto next;
1976 wait_on_buffer(bh);
1977 if (!buffer_uptodate(bh)) {
1978 /* read error, skip block & hope for the best */
1979 brelse(bh);
1980 goto next;
1981 }
1982 i = ocfs2_search_dirblock(bh, dir, name, namelen,
1983 block << sb->s_blocksize_bits,
1984 res_dir);
1985 if (i == 1) {
1986 OCFS2_I(dir)->ip_dir_start_lookup = block;
1987 ret = bh;
1988 goto cleanup_and_exit;
1989 } else {
1990 brelse(bh);
1991 if (i < 0)
1992 goto cleanup_and_exit;
1993 }
1994 next:
1995 if (++block >= nblocks)
1996 block = 0;
1997 } while (block != start);
1998
1999 /*
2000 * If the directory has grown while we were searching, then
2001 * search the last part of the directory before giving up.
2002 */
2003 block = nblocks;
2004 nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2005 if (block < nblocks) {
2006 start = 0;
2007 goto restart;
2008 }
2009
2010 cleanup_and_exit:
2011 /* Clean up the read-ahead blocks */
2012 for (; ra_ptr < ra_max; ra_ptr++)
2013 brelse(bh_use[ra_ptr]);
2014
2015 mlog_exit_ptr(ret);
2016 return ret;
2017 }
2018
2019 static int ocfs2_blkno_stringify(u64 blkno, char *name)
2020 {
2021 int status, namelen;
2022
2023 mlog_entry_void();
2024
2025 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
2026 (long long)blkno);
2027 if (namelen <= 0) {
2028 if (namelen)
2029 status = namelen;
2030 else
2031 status = -EINVAL;
2032 mlog_errno(status);
2033 goto bail;
2034 }
2035 if (namelen != OCFS2_ORPHAN_NAMELEN) {
2036 status = -EINVAL;
2037 mlog_errno(status);
2038 goto bail;
2039 }
2040
2041 mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
2042 namelen);
2043
2044 status = 0;
2045 bail:
2046 mlog_exit(status);
2047 return status;
2048 }
2049
2050 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2051 struct ocfs2_journal_handle *handle,
2052 struct inode *inode,
2053 char *name,
2054 struct buffer_head **de_bh)
2055 {
2056 struct inode *orphan_dir_inode = NULL;
2057 struct buffer_head *orphan_dir_bh = NULL;
2058 int status = 0;
2059
2060 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2061 if (status < 0) {
2062 mlog_errno(status);
2063 goto leave;
2064 }
2065
2066 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2067 ORPHAN_DIR_SYSTEM_INODE,
2068 osb->slot_num);
2069 if (!orphan_dir_inode) {
2070 status = -ENOENT;
2071 mlog_errno(status);
2072 goto leave;
2073 }
2074
2075 ocfs2_handle_add_inode(handle, orphan_dir_inode);
2076 status = ocfs2_meta_lock(orphan_dir_inode, handle, &orphan_dir_bh, 1);
2077 if (status < 0) {
2078 mlog_errno(status);
2079 goto leave;
2080 }
2081
2082 status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2083 orphan_dir_bh, name,
2084 OCFS2_ORPHAN_NAMELEN, de_bh);
2085 if (status < 0) {
2086 mlog_errno(status);
2087 goto leave;
2088 }
2089
2090 leave:
2091 if (orphan_dir_inode)
2092 iput(orphan_dir_inode);
2093
2094 if (orphan_dir_bh)
2095 brelse(orphan_dir_bh);
2096
2097 mlog_exit(status);
2098 return status;
2099 }
2100
2101 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2102 struct ocfs2_journal_handle *handle,
2103 struct inode *inode,
2104 struct ocfs2_dinode *fe,
2105 char *name,
2106 struct buffer_head *de_bh)
2107 {
2108 struct inode *orphan_dir_inode = NULL;
2109 struct buffer_head *orphan_dir_bh = NULL;
2110 int status = 0;
2111 struct ocfs2_dinode *orphan_fe;
2112
2113 mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
2114
2115 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2116 ORPHAN_DIR_SYSTEM_INODE,
2117 osb->slot_num);
2118 if (!orphan_dir_inode) {
2119 status = -ENOENT;
2120 mlog_errno(status);
2121 goto leave;
2122 }
2123
2124 status = ocfs2_read_block(osb,
2125 OCFS2_I(orphan_dir_inode)->ip_blkno,
2126 &orphan_dir_bh, OCFS2_BH_CACHED,
2127 orphan_dir_inode);
2128 if (status < 0) {
2129 mlog_errno(status);
2130 goto leave;
2131 }
2132
2133 status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
2134 OCFS2_JOURNAL_ACCESS_WRITE);
2135 if (status < 0) {
2136 mlog_errno(status);
2137 goto leave;
2138 }
2139
2140 /* we're a cluster, and nlink can change on disk from
2141 * underneath us... */
2142 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2143 if (S_ISDIR(inode->i_mode))
2144 le16_add_cpu(&orphan_fe->i_links_count, 1);
2145 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2146
2147 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2148 if (status < 0) {
2149 mlog_errno(status);
2150 goto leave;
2151 }
2152
2153 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2154 OCFS2_ORPHAN_NAMELEN, inode,
2155 OCFS2_I(inode)->ip_blkno,
2156 orphan_dir_bh, de_bh);
2157 if (status < 0) {
2158 mlog_errno(status);
2159 goto leave;
2160 }
2161
2162 le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2163
2164 /* Record which orphan dir our inode now resides
2165 * in. delete_inode will use this to determine which orphan
2166 * dir to lock. */
2167 spin_lock(&OCFS2_I(inode)->ip_lock);
2168 OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num;
2169 spin_unlock(&OCFS2_I(inode)->ip_lock);
2170
2171 mlog(0, "Inode %llu orphaned in slot %d\n",
2172 (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
2173
2174 leave:
2175 if (orphan_dir_inode)
2176 iput(orphan_dir_inode);
2177
2178 if (orphan_dir_bh)
2179 brelse(orphan_dir_bh);
2180
2181 mlog_exit(status);
2182 return status;
2183 }
2184
2185 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2186 int ocfs2_orphan_del(struct ocfs2_super *osb,
2187 struct ocfs2_journal_handle *handle,
2188 struct inode *orphan_dir_inode,
2189 struct inode *inode,
2190 struct buffer_head *orphan_dir_bh)
2191 {
2192 char name[OCFS2_ORPHAN_NAMELEN + 1];
2193 struct ocfs2_dinode *orphan_fe;
2194 int status = 0;
2195 struct buffer_head *target_de_bh = NULL;
2196 struct ocfs2_dir_entry *target_de = NULL;
2197
2198 mlog_entry_void();
2199
2200 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2201 if (status < 0) {
2202 mlog_errno(status);
2203 goto leave;
2204 }
2205
2206 mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
2207 name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2208 OCFS2_ORPHAN_NAMELEN);
2209
2210 /* find it's spot in the orphan directory */
2211 target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
2212 orphan_dir_inode, &target_de);
2213 if (!target_de_bh) {
2214 status = -ENOENT;
2215 mlog_errno(status);
2216 goto leave;
2217 }
2218
2219 /* remove it from the orphan directory */
2220 status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
2221 target_de_bh);
2222 if (status < 0) {
2223 mlog_errno(status);
2224 goto leave;
2225 }
2226
2227 status = ocfs2_journal_access(handle,orphan_dir_inode, orphan_dir_bh,
2228 OCFS2_JOURNAL_ACCESS_WRITE);
2229 if (status < 0) {
2230 mlog_errno(status);
2231 goto leave;
2232 }
2233
2234 /* do the i_nlink dance! :) */
2235 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2236 if (S_ISDIR(inode->i_mode))
2237 le16_add_cpu(&orphan_fe->i_links_count, -1);
2238 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2239
2240 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2241 if (status < 0) {
2242 mlog_errno(status);
2243 goto leave;
2244 }
2245
2246 leave:
2247 if (target_de_bh)
2248 brelse(target_de_bh);
2249
2250 mlog_exit(status);
2251 return status;
2252 }
2253
2254 struct inode_operations ocfs2_dir_iops = {
2255 .create = ocfs2_create,
2256 .lookup = ocfs2_lookup,
2257 .link = ocfs2_link,
2258 .unlink = ocfs2_unlink,
2259 .rmdir = ocfs2_unlink,
2260 .symlink = ocfs2_symlink,
2261 .mkdir = ocfs2_mkdir,
2262 .mknod = ocfs2_mknod,
2263 .rename = ocfs2_rename,
2264 .setattr = ocfs2_setattr,
2265 .getattr = ocfs2_getattr,
2266 };
Linux kernel - Deliverables
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