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ocfs2: Provide convenience function for ino lookup
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ocfs2 / namei.c
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * namei.c
5 *
6 * Create and rename file, directory, symlinks
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * Portions of this code from linux/fs/ext3/dir.c
11 *
12 * Copyright (C) 1992, 1993, 1994, 1995
13 * Remy Card (card@masi.ibp.fr)
14 * Laboratoire MASI - Institut Blaise pascal
15 * Universite Pierre et Marie Curie (Paris VI)
16 *
17 * from
18 *
19 * linux/fs/minix/dir.c
20 *
21 * Copyright (C) 1991, 1992 Linux Torvalds
22 *
23 * This program is free software; you can redistribute it and/or
24 * modify it under the terms of the GNU General Public
25 * License as published by the Free Software Foundation; either
26 * version 2 of the License, or (at your option) any later version.
27 *
28 * This program is distributed in the hope that it will be useful,
29 * but WITHOUT ANY WARRANTY; without even the implied warranty of
30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
31 * General Public License for more details.
32 *
33 * You should have received a copy of the GNU General Public
34 * License along with this program; if not, write to the
35 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
36 * Boston, MA 021110-1307, USA.
37 */
38
39 #include <linux/fs.h>
40 #include <linux/types.h>
41 #include <linux/slab.h>
42 #include <linux/highmem.h>
43
44 #define MLOG_MASK_PREFIX ML_NAMEI
45 #include <cluster/masklog.h>
46
47 #include "ocfs2.h"
48
49 #include "alloc.h"
50 #include "dcache.h"
51 #include "dir.h"
52 #include "dlmglue.h"
53 #include "extent_map.h"
54 #include "file.h"
55 #include "inode.h"
56 #include "journal.h"
57 #include "namei.h"
58 #include "suballoc.h"
59 #include "super.h"
60 #include "symlink.h"
61 #include "sysfile.h"
62 #include "uptodate.h"
63 #include "vote.h"
64
65 #include "buffer_head_io.h"
66
67 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
68 struct inode *dir,
69 struct dentry *dentry, int mode,
70 dev_t dev,
71 struct buffer_head **new_fe_bh,
72 struct buffer_head *parent_fe_bh,
73 handle_t *handle,
74 struct inode **ret_inode,
75 struct ocfs2_alloc_context *inode_ac);
76
77 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
78 struct inode **ret_orphan_dir,
79 struct inode *inode,
80 char *name,
81 struct buffer_head **de_bh);
82
83 static int ocfs2_orphan_add(struct ocfs2_super *osb,
84 handle_t *handle,
85 struct inode *inode,
86 struct ocfs2_dinode *fe,
87 char *name,
88 struct buffer_head *de_bh,
89 struct inode *orphan_dir_inode);
90
91 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
92 handle_t *handle,
93 struct inode *inode,
94 const char *symname);
95
96 /* An orphan dir name is an 8 byte value, printed as a hex string */
97 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
98
99 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
100 struct nameidata *nd)
101 {
102 int status;
103 u64 blkno;
104 struct inode *inode = NULL;
105 struct dentry *ret;
106 struct ocfs2_inode_info *oi;
107
108 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
109 dentry->d_name.len, dentry->d_name.name);
110
111 if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
112 ret = ERR_PTR(-ENAMETOOLONG);
113 goto bail;
114 }
115
116 mlog(0, "find name %.*s in directory %llu\n", dentry->d_name.len,
117 dentry->d_name.name, (unsigned long long)OCFS2_I(dir)->ip_blkno);
118
119 status = ocfs2_meta_lock(dir, NULL, 0);
120 if (status < 0) {
121 if (status != -ENOENT)
122 mlog_errno(status);
123 ret = ERR_PTR(status);
124 goto bail;
125 }
126
127 status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
128 dentry->d_name.len, &blkno);
129 if (status < 0)
130 goto bail_add;
131
132 inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0);
133 if (IS_ERR(inode)) {
134 ret = ERR_PTR(-EACCES);
135 goto bail_unlock;
136 }
137
138 oi = OCFS2_I(inode);
139 /* Clear any orphaned state... If we were able to look up the
140 * inode from a directory, it certainly can't be orphaned. We
141 * might have the bad state from a node which intended to
142 * orphan this inode but crashed before it could commit the
143 * unlink. */
144 spin_lock(&oi->ip_lock);
145 oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
146 spin_unlock(&oi->ip_lock);
147
148 bail_add:
149 dentry->d_op = &ocfs2_dentry_ops;
150 ret = d_splice_alias(inode, dentry);
151
152 if (inode) {
153 /*
154 * If d_splice_alias() finds a DCACHE_DISCONNECTED
155 * dentry, it will d_move() it on top of ourse. The
156 * return value will indicate this however, so in
157 * those cases, we switch them around for the locking
158 * code.
159 *
160 * NOTE: This dentry already has ->d_op set from
161 * ocfs2_get_parent() and ocfs2_get_dentry()
162 */
163 if (ret)
164 dentry = ret;
165
166 status = ocfs2_dentry_attach_lock(dentry, inode,
167 OCFS2_I(dir)->ip_blkno);
168 if (status) {
169 mlog_errno(status);
170 ret = ERR_PTR(status);
171 goto bail_unlock;
172 }
173 }
174
175 bail_unlock:
176 /* Don't drop the cluster lock until *after* the d_add --
177 * unlink on another node will message us to remove that
178 * dentry under this lock so otherwise we can race this with
179 * the vote thread and have a stale dentry. */
180 ocfs2_meta_unlock(dir, 0);
181
182 bail:
183
184 mlog_exit_ptr(ret);
185
186 return ret;
187 }
188
189 static int ocfs2_mknod(struct inode *dir,
190 struct dentry *dentry,
191 int mode,
192 dev_t dev)
193 {
194 int status = 0;
195 struct buffer_head *parent_fe_bh = NULL;
196 handle_t *handle = NULL;
197 struct ocfs2_super *osb;
198 struct ocfs2_dinode *dirfe;
199 struct buffer_head *new_fe_bh = NULL;
200 struct buffer_head *de_bh = NULL;
201 struct inode *inode = NULL;
202 struct ocfs2_alloc_context *inode_ac = NULL;
203 struct ocfs2_alloc_context *data_ac = NULL;
204
205 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
206 (unsigned long)dev, dentry->d_name.len,
207 dentry->d_name.name);
208
209 /* get our super block */
210 osb = OCFS2_SB(dir->i_sb);
211
212 status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
213 if (status < 0) {
214 if (status != -ENOENT)
215 mlog_errno(status);
216 return status;
217 }
218
219 if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
220 status = -EMLINK;
221 goto leave;
222 }
223
224 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
225 if (!dirfe->i_links_count) {
226 /* can't make a file in a deleted directory. */
227 status = -ENOENT;
228 goto leave;
229 }
230
231 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
232 dentry->d_name.len);
233 if (status)
234 goto leave;
235
236 /* get a spot inside the dir. */
237 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
238 dentry->d_name.name,
239 dentry->d_name.len, &de_bh);
240 if (status < 0) {
241 mlog_errno(status);
242 goto leave;
243 }
244
245 /* reserve an inode spot */
246 status = ocfs2_reserve_new_inode(osb, &inode_ac);
247 if (status < 0) {
248 if (status != -ENOSPC)
249 mlog_errno(status);
250 goto leave;
251 }
252
253 /* are we making a directory? If so, reserve a cluster for his
254 * 1st extent. */
255 if (S_ISDIR(mode)) {
256 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
257 if (status < 0) {
258 if (status != -ENOSPC)
259 mlog_errno(status);
260 goto leave;
261 }
262 }
263
264 handle = ocfs2_start_trans(osb, OCFS2_MKNOD_CREDITS);
265 if (IS_ERR(handle)) {
266 status = PTR_ERR(handle);
267 handle = NULL;
268 mlog_errno(status);
269 goto leave;
270 }
271
272 /* do the real work now. */
273 status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
274 &new_fe_bh, parent_fe_bh, handle,
275 &inode, inode_ac);
276 if (status < 0) {
277 mlog_errno(status);
278 goto leave;
279 }
280
281 if (S_ISDIR(mode)) {
282 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
283 new_fe_bh, data_ac);
284 if (status < 0) {
285 mlog_errno(status);
286 goto leave;
287 }
288
289 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
290 OCFS2_JOURNAL_ACCESS_WRITE);
291 if (status < 0) {
292 mlog_errno(status);
293 goto leave;
294 }
295 le16_add_cpu(&dirfe->i_links_count, 1);
296 status = ocfs2_journal_dirty(handle, parent_fe_bh);
297 if (status < 0) {
298 mlog_errno(status);
299 goto leave;
300 }
301 inc_nlink(dir);
302 }
303
304 status = ocfs2_add_entry(handle, dentry, inode,
305 OCFS2_I(inode)->ip_blkno, parent_fe_bh,
306 de_bh);
307 if (status < 0) {
308 mlog_errno(status);
309 goto leave;
310 }
311
312 status = ocfs2_dentry_attach_lock(dentry, inode,
313 OCFS2_I(dir)->ip_blkno);
314 if (status) {
315 mlog_errno(status);
316 goto leave;
317 }
318
319 insert_inode_hash(inode);
320 dentry->d_op = &ocfs2_dentry_ops;
321 d_instantiate(dentry, inode);
322 status = 0;
323 leave:
324 if (handle)
325 ocfs2_commit_trans(osb, handle);
326
327 ocfs2_meta_unlock(dir, 1);
328
329 if (status == -ENOSPC)
330 mlog(0, "Disk is full\n");
331
332 if (new_fe_bh)
333 brelse(new_fe_bh);
334
335 if (de_bh)
336 brelse(de_bh);
337
338 if (parent_fe_bh)
339 brelse(parent_fe_bh);
340
341 if ((status < 0) && inode)
342 iput(inode);
343
344 if (inode_ac)
345 ocfs2_free_alloc_context(inode_ac);
346
347 if (data_ac)
348 ocfs2_free_alloc_context(data_ac);
349
350 mlog_exit(status);
351
352 return status;
353 }
354
355 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
356 struct inode *dir,
357 struct dentry *dentry, int mode,
358 dev_t dev,
359 struct buffer_head **new_fe_bh,
360 struct buffer_head *parent_fe_bh,
361 handle_t *handle,
362 struct inode **ret_inode,
363 struct ocfs2_alloc_context *inode_ac)
364 {
365 int status = 0;
366 struct ocfs2_dinode *fe = NULL;
367 struct ocfs2_extent_list *fel;
368 u64 fe_blkno = 0;
369 u16 suballoc_bit;
370 struct inode *inode = NULL;
371
372 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
373 (unsigned long)dev, dentry->d_name.len,
374 dentry->d_name.name);
375
376 *new_fe_bh = NULL;
377 *ret_inode = NULL;
378
379 status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
380 &fe_blkno);
381 if (status < 0) {
382 mlog_errno(status);
383 goto leave;
384 }
385
386 inode = new_inode(dir->i_sb);
387 if (IS_ERR(inode)) {
388 status = PTR_ERR(inode);
389 mlog(ML_ERROR, "new_inode failed!\n");
390 goto leave;
391 }
392
393 /* populate as many fields early on as possible - many of
394 * these are used by the support functions here and in
395 * callers. */
396 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
397 OCFS2_I(inode)->ip_blkno = fe_blkno;
398 if (S_ISDIR(mode))
399 inode->i_nlink = 2;
400 else
401 inode->i_nlink = 1;
402 inode->i_mode = mode;
403 spin_lock(&osb->osb_lock);
404 inode->i_generation = osb->s_next_generation++;
405 spin_unlock(&osb->osb_lock);
406
407 *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
408 if (!*new_fe_bh) {
409 status = -EIO;
410 mlog_errno(status);
411 goto leave;
412 }
413 ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
414
415 status = ocfs2_journal_access(handle, inode, *new_fe_bh,
416 OCFS2_JOURNAL_ACCESS_CREATE);
417 if (status < 0) {
418 mlog_errno(status);
419 goto leave;
420 }
421
422 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
423 memset(fe, 0, osb->sb->s_blocksize);
424
425 fe->i_generation = cpu_to_le32(inode->i_generation);
426 fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
427 fe->i_blkno = cpu_to_le64(fe_blkno);
428 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
429 fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
430 fe->i_uid = cpu_to_le32(current->fsuid);
431 if (dir->i_mode & S_ISGID) {
432 fe->i_gid = cpu_to_le32(dir->i_gid);
433 if (S_ISDIR(mode))
434 mode |= S_ISGID;
435 } else
436 fe->i_gid = cpu_to_le32(current->fsgid);
437 fe->i_mode = cpu_to_le16(mode);
438 if (S_ISCHR(mode) || S_ISBLK(mode))
439 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
440
441 fe->i_links_count = cpu_to_le16(inode->i_nlink);
442
443 fe->i_last_eb_blk = 0;
444 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
445 le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
446 fe->i_atime = fe->i_ctime = fe->i_mtime =
447 cpu_to_le64(CURRENT_TIME.tv_sec);
448 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
449 cpu_to_le32(CURRENT_TIME.tv_nsec);
450 fe->i_dtime = 0;
451
452 fel = &fe->id2.i_list;
453 fel->l_tree_depth = 0;
454 fel->l_next_free_rec = 0;
455 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
456
457 status = ocfs2_journal_dirty(handle, *new_fe_bh);
458 if (status < 0) {
459 mlog_errno(status);
460 goto leave;
461 }
462
463 if (ocfs2_populate_inode(inode, fe, 1) < 0) {
464 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
465 "i_blkno=%llu, i_ino=%lu\n",
466 (unsigned long long)(*new_fe_bh)->b_blocknr,
467 (unsigned long long)le64_to_cpu(fe->i_blkno),
468 inode->i_ino);
469 BUG();
470 }
471
472 ocfs2_inode_set_new(osb, inode);
473 if (!ocfs2_mount_local(osb)) {
474 status = ocfs2_create_new_inode_locks(inode);
475 if (status < 0)
476 mlog_errno(status);
477 }
478
479 status = 0; /* error in ocfs2_create_new_inode_locks is not
480 * critical */
481
482 *ret_inode = inode;
483 leave:
484 if (status < 0) {
485 if (*new_fe_bh) {
486 brelse(*new_fe_bh);
487 *new_fe_bh = NULL;
488 }
489 if (inode)
490 iput(inode);
491 }
492
493 mlog_exit(status);
494 return status;
495 }
496
497 static int ocfs2_mkdir(struct inode *dir,
498 struct dentry *dentry,
499 int mode)
500 {
501 int ret;
502
503 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
504 dentry->d_name.len, dentry->d_name.name);
505 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
506 mlog_exit(ret);
507
508 return ret;
509 }
510
511 static int ocfs2_create(struct inode *dir,
512 struct dentry *dentry,
513 int mode,
514 struct nameidata *nd)
515 {
516 int ret;
517
518 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
519 dentry->d_name.len, dentry->d_name.name);
520 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
521 mlog_exit(ret);
522
523 return ret;
524 }
525
526 static int ocfs2_link(struct dentry *old_dentry,
527 struct inode *dir,
528 struct dentry *dentry)
529 {
530 handle_t *handle;
531 struct inode *inode = old_dentry->d_inode;
532 int err;
533 struct buffer_head *fe_bh = NULL;
534 struct buffer_head *parent_fe_bh = NULL;
535 struct buffer_head *de_bh = NULL;
536 struct ocfs2_dinode *fe = NULL;
537 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
538
539 mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
540 old_dentry->d_name.len, old_dentry->d_name.name,
541 dentry->d_name.len, dentry->d_name.name);
542
543 if (S_ISDIR(inode->i_mode))
544 return -EPERM;
545
546 err = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
547 if (err < 0) {
548 if (err != -ENOENT)
549 mlog_errno(err);
550 return err;
551 }
552
553 if (!dir->i_nlink) {
554 err = -ENOENT;
555 goto out;
556 }
557
558 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
559 dentry->d_name.len);
560 if (err)
561 goto out;
562
563 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
564 dentry->d_name.name,
565 dentry->d_name.len, &de_bh);
566 if (err < 0) {
567 mlog_errno(err);
568 goto out;
569 }
570
571 err = ocfs2_meta_lock(inode, &fe_bh, 1);
572 if (err < 0) {
573 if (err != -ENOENT)
574 mlog_errno(err);
575 goto out;
576 }
577
578 fe = (struct ocfs2_dinode *) fe_bh->b_data;
579 if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
580 err = -EMLINK;
581 goto out_unlock_inode;
582 }
583
584 handle = ocfs2_start_trans(osb, OCFS2_LINK_CREDITS);
585 if (IS_ERR(handle)) {
586 err = PTR_ERR(handle);
587 handle = NULL;
588 mlog_errno(err);
589 goto out_unlock_inode;
590 }
591
592 err = ocfs2_journal_access(handle, inode, fe_bh,
593 OCFS2_JOURNAL_ACCESS_WRITE);
594 if (err < 0) {
595 mlog_errno(err);
596 goto out_commit;
597 }
598
599 inc_nlink(inode);
600 inode->i_ctime = CURRENT_TIME;
601 fe->i_links_count = cpu_to_le16(inode->i_nlink);
602 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
603 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
604
605 err = ocfs2_journal_dirty(handle, fe_bh);
606 if (err < 0) {
607 le16_add_cpu(&fe->i_links_count, -1);
608 drop_nlink(inode);
609 mlog_errno(err);
610 goto out_commit;
611 }
612
613 err = ocfs2_add_entry(handle, dentry, inode,
614 OCFS2_I(inode)->ip_blkno,
615 parent_fe_bh, de_bh);
616 if (err) {
617 le16_add_cpu(&fe->i_links_count, -1);
618 drop_nlink(inode);
619 mlog_errno(err);
620 goto out_commit;
621 }
622
623 err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
624 if (err) {
625 mlog_errno(err);
626 goto out_commit;
627 }
628
629 atomic_inc(&inode->i_count);
630 dentry->d_op = &ocfs2_dentry_ops;
631 d_instantiate(dentry, inode);
632
633 out_commit:
634 ocfs2_commit_trans(osb, handle);
635 out_unlock_inode:
636 ocfs2_meta_unlock(inode, 1);
637
638 out:
639 ocfs2_meta_unlock(dir, 1);
640
641 if (de_bh)
642 brelse(de_bh);
643 if (fe_bh)
644 brelse(fe_bh);
645 if (parent_fe_bh)
646 brelse(parent_fe_bh);
647
648 mlog_exit(err);
649
650 return err;
651 }
652
653 /*
654 * Takes and drops an exclusive lock on the given dentry. This will
655 * force other nodes to drop it.
656 */
657 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
658 {
659 int ret;
660
661 ret = ocfs2_dentry_lock(dentry, 1);
662 if (ret)
663 mlog_errno(ret);
664 else
665 ocfs2_dentry_unlock(dentry, 1);
666
667 return ret;
668 }
669
670 static inline int inode_is_unlinkable(struct inode *inode)
671 {
672 if (S_ISDIR(inode->i_mode)) {
673 if (inode->i_nlink == 2)
674 return 1;
675 return 0;
676 }
677
678 if (inode->i_nlink == 1)
679 return 1;
680 return 0;
681 }
682
683 static int ocfs2_unlink(struct inode *dir,
684 struct dentry *dentry)
685 {
686 int status;
687 int child_locked = 0;
688 struct inode *inode = dentry->d_inode;
689 struct inode *orphan_dir = NULL;
690 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
691 u64 blkno;
692 struct ocfs2_dinode *fe = NULL;
693 struct buffer_head *fe_bh = NULL;
694 struct buffer_head *parent_node_bh = NULL;
695 handle_t *handle = NULL;
696 struct ocfs2_dir_entry *dirent = NULL;
697 struct buffer_head *dirent_bh = NULL;
698 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
699 struct buffer_head *orphan_entry_bh = NULL;
700
701 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
702 dentry->d_name.len, dentry->d_name.name);
703
704 BUG_ON(dentry->d_parent->d_inode != dir);
705
706 mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
707
708 if (inode == osb->root_inode) {
709 mlog(0, "Cannot delete the root directory\n");
710 return -EPERM;
711 }
712
713 status = ocfs2_meta_lock(dir, &parent_node_bh, 1);
714 if (status < 0) {
715 if (status != -ENOENT)
716 mlog_errno(status);
717 return status;
718 }
719
720 status = ocfs2_find_files_on_disk(dentry->d_name.name,
721 dentry->d_name.len, &blkno,
722 dir, &dirent_bh, &dirent);
723 if (status < 0) {
724 if (status != -ENOENT)
725 mlog_errno(status);
726 goto leave;
727 }
728
729 if (OCFS2_I(inode)->ip_blkno != blkno) {
730 status = -ENOENT;
731
732 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
733 (unsigned long long)OCFS2_I(inode)->ip_blkno,
734 (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
735 goto leave;
736 }
737
738 status = ocfs2_meta_lock(inode, &fe_bh, 1);
739 if (status < 0) {
740 if (status != -ENOENT)
741 mlog_errno(status);
742 goto leave;
743 }
744 child_locked = 1;
745
746 if (S_ISDIR(inode->i_mode)) {
747 if (!ocfs2_empty_dir(inode)) {
748 status = -ENOTEMPTY;
749 goto leave;
750 } else if (inode->i_nlink != 2) {
751 status = -ENOTEMPTY;
752 goto leave;
753 }
754 }
755
756 status = ocfs2_remote_dentry_delete(dentry);
757 if (status < 0) {
758 /* This vote should succeed under all normal
759 * circumstances. */
760 mlog_errno(status);
761 goto leave;
762 }
763
764 if (inode_is_unlinkable(inode)) {
765 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
766 orphan_name,
767 &orphan_entry_bh);
768 if (status < 0) {
769 mlog_errno(status);
770 goto leave;
771 }
772 }
773
774 handle = ocfs2_start_trans(osb, OCFS2_UNLINK_CREDITS);
775 if (IS_ERR(handle)) {
776 status = PTR_ERR(handle);
777 handle = NULL;
778 mlog_errno(status);
779 goto leave;
780 }
781
782 status = ocfs2_journal_access(handle, inode, fe_bh,
783 OCFS2_JOURNAL_ACCESS_WRITE);
784 if (status < 0) {
785 mlog_errno(status);
786 goto leave;
787 }
788
789 fe = (struct ocfs2_dinode *) fe_bh->b_data;
790
791 if (inode_is_unlinkable(inode)) {
792 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
793 orphan_entry_bh, orphan_dir);
794 if (status < 0) {
795 mlog_errno(status);
796 goto leave;
797 }
798 }
799
800 /* delete the name from the parent dir */
801 status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
802 if (status < 0) {
803 mlog_errno(status);
804 goto leave;
805 }
806
807 if (S_ISDIR(inode->i_mode))
808 drop_nlink(inode);
809 drop_nlink(inode);
810 fe->i_links_count = cpu_to_le16(inode->i_nlink);
811
812 status = ocfs2_journal_dirty(handle, fe_bh);
813 if (status < 0) {
814 mlog_errno(status);
815 goto leave;
816 }
817
818 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
819 if (S_ISDIR(inode->i_mode))
820 drop_nlink(dir);
821
822 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
823 if (status < 0) {
824 mlog_errno(status);
825 if (S_ISDIR(inode->i_mode))
826 inc_nlink(dir);
827 }
828
829 leave:
830 if (handle)
831 ocfs2_commit_trans(osb, handle);
832
833 if (child_locked)
834 ocfs2_meta_unlock(inode, 1);
835
836 ocfs2_meta_unlock(dir, 1);
837
838 if (orphan_dir) {
839 /* This was locked for us in ocfs2_prepare_orphan_dir() */
840 ocfs2_meta_unlock(orphan_dir, 1);
841 mutex_unlock(&orphan_dir->i_mutex);
842 iput(orphan_dir);
843 }
844
845 if (fe_bh)
846 brelse(fe_bh);
847
848 if (dirent_bh)
849 brelse(dirent_bh);
850
851 if (parent_node_bh)
852 brelse(parent_node_bh);
853
854 if (orphan_entry_bh)
855 brelse(orphan_entry_bh);
856
857 mlog_exit(status);
858
859 return status;
860 }
861
862 /*
863 * The only place this should be used is rename!
864 * if they have the same id, then the 1st one is the only one locked.
865 */
866 static int ocfs2_double_lock(struct ocfs2_super *osb,
867 struct buffer_head **bh1,
868 struct inode *inode1,
869 struct buffer_head **bh2,
870 struct inode *inode2)
871 {
872 int status;
873 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
874 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
875 struct buffer_head **tmpbh;
876 struct inode *tmpinode;
877
878 mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
879 (unsigned long long)oi1->ip_blkno,
880 (unsigned long long)oi2->ip_blkno);
881
882 if (*bh1)
883 *bh1 = NULL;
884 if (*bh2)
885 *bh2 = NULL;
886
887 /* we always want to lock the one with the lower lockid first. */
888 if (oi1->ip_blkno != oi2->ip_blkno) {
889 if (oi1->ip_blkno < oi2->ip_blkno) {
890 /* switch id1 and id2 around */
891 mlog(0, "switching them around...\n");
892 tmpbh = bh2;
893 bh2 = bh1;
894 bh1 = tmpbh;
895
896 tmpinode = inode2;
897 inode2 = inode1;
898 inode1 = tmpinode;
899 }
900 /* lock id2 */
901 status = ocfs2_meta_lock(inode2, bh2, 1);
902 if (status < 0) {
903 if (status != -ENOENT)
904 mlog_errno(status);
905 goto bail;
906 }
907 }
908
909 /* lock id1 */
910 status = ocfs2_meta_lock(inode1, bh1, 1);
911 if (status < 0) {
912 /*
913 * An error return must mean that no cluster locks
914 * were held on function exit.
915 */
916 if (oi1->ip_blkno != oi2->ip_blkno)
917 ocfs2_meta_unlock(inode2, 1);
918
919 if (status != -ENOENT)
920 mlog_errno(status);
921 }
922
923 bail:
924 mlog_exit(status);
925 return status;
926 }
927
928 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
929 {
930 ocfs2_meta_unlock(inode1, 1);
931
932 if (inode1 != inode2)
933 ocfs2_meta_unlock(inode2, 1);
934 }
935
936 #define PARENT_INO(buffer) \
937 ((struct ocfs2_dir_entry *) \
938 ((char *)buffer + \
939 le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode
940
941 static int ocfs2_rename(struct inode *old_dir,
942 struct dentry *old_dentry,
943 struct inode *new_dir,
944 struct dentry *new_dentry)
945 {
946 int status = 0, rename_lock = 0, parents_locked = 0;
947 int old_child_locked = 0, new_child_locked = 0;
948 struct inode *old_inode = old_dentry->d_inode;
949 struct inode *new_inode = new_dentry->d_inode;
950 struct inode *orphan_dir = NULL;
951 struct ocfs2_dinode *newfe = NULL;
952 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
953 struct buffer_head *orphan_entry_bh = NULL;
954 struct buffer_head *newfe_bh = NULL;
955 struct buffer_head *old_inode_bh = NULL;
956 struct buffer_head *insert_entry_bh = NULL;
957 struct ocfs2_super *osb = NULL;
958 u64 newfe_blkno;
959 handle_t *handle = NULL;
960 struct buffer_head *old_dir_bh = NULL;
961 struct buffer_head *new_dir_bh = NULL;
962 struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry
963 // and new_dentry
964 struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
965 struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
966 // this is the 1st dirent bh
967 nlink_t old_dir_nlink = old_dir->i_nlink;
968 struct ocfs2_dinode *old_di;
969
970 /* At some point it might be nice to break this function up a
971 * bit. */
972
973 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
974 old_dir, old_dentry, new_dir, new_dentry,
975 old_dentry->d_name.len, old_dentry->d_name.name,
976 new_dentry->d_name.len, new_dentry->d_name.name);
977
978 osb = OCFS2_SB(old_dir->i_sb);
979
980 if (new_inode) {
981 if (!igrab(new_inode))
982 BUG();
983 }
984
985 /* Assume a directory hierarchy thusly:
986 * a/b/c
987 * a/d
988 * a,b,c, and d are all directories.
989 *
990 * from cwd of 'a' on both nodes:
991 * node1: mv b/c d
992 * node2: mv d b/c
993 *
994 * And that's why, just like the VFS, we need a file system
995 * rename lock. */
996 if (old_dentry != new_dentry) {
997 status = ocfs2_rename_lock(osb);
998 if (status < 0) {
999 mlog_errno(status);
1000 goto bail;
1001 }
1002 rename_lock = 1;
1003 }
1004
1005 /* if old and new are the same, this'll just do one lock. */
1006 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1007 &new_dir_bh, new_dir);
1008 if (status < 0) {
1009 mlog_errno(status);
1010 goto bail;
1011 }
1012 parents_locked = 1;
1013
1014 /* make sure both dirs have bhs
1015 * get an extra ref on old_dir_bh if old==new */
1016 if (!new_dir_bh) {
1017 if (old_dir_bh) {
1018 new_dir_bh = old_dir_bh;
1019 get_bh(new_dir_bh);
1020 } else {
1021 mlog(ML_ERROR, "no old_dir_bh!\n");
1022 status = -EIO;
1023 goto bail;
1024 }
1025 }
1026
1027 /*
1028 * Aside from allowing a meta data update, the locking here
1029 * also ensures that the vote thread on other nodes won't have
1030 * to concurrently downconvert the inode and the dentry locks.
1031 */
1032 status = ocfs2_meta_lock(old_inode, &old_inode_bh, 1);
1033 if (status < 0) {
1034 if (status != -ENOENT)
1035 mlog_errno(status);
1036 goto bail;
1037 }
1038 old_child_locked = 1;
1039
1040 status = ocfs2_remote_dentry_delete(old_dentry);
1041 if (status < 0) {
1042 mlog_errno(status);
1043 goto bail;
1044 }
1045
1046 if (S_ISDIR(old_inode->i_mode)) {
1047 status = -EIO;
1048 old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0);
1049 if (!old_inode_de_bh)
1050 goto bail;
1051
1052 status = -EIO;
1053 if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) !=
1054 OCFS2_I(old_dir)->ip_blkno)
1055 goto bail;
1056 status = -EMLINK;
1057 if (!new_inode && new_dir!=old_dir &&
1058 new_dir->i_nlink >= OCFS2_LINK_MAX)
1059 goto bail;
1060 }
1061
1062 status = -ENOENT;
1063 old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1064 old_dentry->d_name.len,
1065 old_dir, &old_de);
1066 if (!old_de_bh)
1067 goto bail;
1068
1069 /*
1070 * Check for inode number is _not_ due to possible IO errors.
1071 * We might rmdir the source, keep it as pwd of some process
1072 * and merrily kill the link to whatever was created under the
1073 * same name. Goodbye sticky bit ;-<
1074 */
1075 if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno)
1076 goto bail;
1077
1078 /* check if the target already exists (in which case we need
1079 * to delete it */
1080 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1081 new_dentry->d_name.len,
1082 &newfe_blkno, new_dir, &new_de_bh,
1083 &new_de);
1084 /* The only error we allow here is -ENOENT because the new
1085 * file not existing is perfectly valid. */
1086 if ((status < 0) && (status != -ENOENT)) {
1087 /* If we cannot find the file specified we should just */
1088 /* return the error... */
1089 mlog_errno(status);
1090 goto bail;
1091 }
1092
1093 if (!new_de && new_inode)
1094 mlog(ML_ERROR, "inode %lu does not exist in it's parent "
1095 "directory!", new_inode->i_ino);
1096
1097 /* In case we need to overwrite an existing file, we blow it
1098 * away first */
1099 if (new_de) {
1100 /* VFS didn't think there existed an inode here, but
1101 * someone else in the cluster must have raced our
1102 * rename to create one. Today we error cleanly, in
1103 * the future we should consider calling iget to build
1104 * a new struct inode for this entry. */
1105 if (!new_inode) {
1106 status = -EACCES;
1107
1108 mlog(0, "We found an inode for name %.*s but VFS "
1109 "didn't give us one.\n", new_dentry->d_name.len,
1110 new_dentry->d_name.name);
1111 goto bail;
1112 }
1113
1114 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1115 status = -EACCES;
1116
1117 mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1118 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1119 (unsigned long long)newfe_blkno,
1120 OCFS2_I(new_inode)->ip_flags);
1121 goto bail;
1122 }
1123
1124 status = ocfs2_meta_lock(new_inode, &newfe_bh, 1);
1125 if (status < 0) {
1126 if (status != -ENOENT)
1127 mlog_errno(status);
1128 goto bail;
1129 }
1130 new_child_locked = 1;
1131
1132 status = ocfs2_remote_dentry_delete(new_dentry);
1133 if (status < 0) {
1134 mlog_errno(status);
1135 goto bail;
1136 }
1137
1138 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1139
1140 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1141 "newfebh=%p bhblocknr=%llu\n", new_de,
1142 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1143 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1144
1145 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1146 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1147 new_inode,
1148 orphan_name,
1149 &orphan_entry_bh);
1150 if (status < 0) {
1151 mlog_errno(status);
1152 goto bail;
1153 }
1154 }
1155 } else {
1156 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1157
1158 status = ocfs2_check_dir_for_entry(new_dir,
1159 new_dentry->d_name.name,
1160 new_dentry->d_name.len);
1161 if (status)
1162 goto bail;
1163
1164 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1165 new_dentry->d_name.name,
1166 new_dentry->d_name.len,
1167 &insert_entry_bh);
1168 if (status < 0) {
1169 mlog_errno(status);
1170 goto bail;
1171 }
1172 }
1173
1174 handle = ocfs2_start_trans(osb, OCFS2_RENAME_CREDITS);
1175 if (IS_ERR(handle)) {
1176 status = PTR_ERR(handle);
1177 handle = NULL;
1178 mlog_errno(status);
1179 goto bail;
1180 }
1181
1182 if (new_de) {
1183 if (S_ISDIR(new_inode->i_mode)) {
1184 if (!ocfs2_empty_dir(new_inode) ||
1185 new_inode->i_nlink != 2) {
1186 status = -ENOTEMPTY;
1187 goto bail;
1188 }
1189 }
1190 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1191 OCFS2_JOURNAL_ACCESS_WRITE);
1192 if (status < 0) {
1193 mlog_errno(status);
1194 goto bail;
1195 }
1196
1197 if (S_ISDIR(new_inode->i_mode) ||
1198 (newfe->i_links_count == cpu_to_le16(1))){
1199 status = ocfs2_orphan_add(osb, handle, new_inode,
1200 newfe, orphan_name,
1201 orphan_entry_bh, orphan_dir);
1202 if (status < 0) {
1203 mlog_errno(status);
1204 goto bail;
1205 }
1206 }
1207
1208 /* change the dirent to point to the correct inode */
1209 status = ocfs2_journal_access(handle, new_dir, new_de_bh,
1210 OCFS2_JOURNAL_ACCESS_WRITE);
1211 if (status < 0) {
1212 mlog_errno(status);
1213 goto bail;
1214 }
1215 new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno);
1216 new_de->file_type = old_de->file_type;
1217 new_dir->i_version++;
1218 status = ocfs2_journal_dirty(handle, new_de_bh);
1219 if (status < 0) {
1220 mlog_errno(status);
1221 goto bail;
1222 }
1223
1224 if (S_ISDIR(new_inode->i_mode))
1225 newfe->i_links_count = 0;
1226 else
1227 le16_add_cpu(&newfe->i_links_count, -1);
1228
1229 status = ocfs2_journal_dirty(handle, newfe_bh);
1230 if (status < 0) {
1231 mlog_errno(status);
1232 goto bail;
1233 }
1234 } else {
1235 /* if the name was not found in new_dir, add it now */
1236 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1237 OCFS2_I(old_inode)->ip_blkno,
1238 new_dir_bh, insert_entry_bh);
1239 }
1240
1241 old_inode->i_ctime = CURRENT_TIME;
1242 mark_inode_dirty(old_inode);
1243
1244 status = ocfs2_journal_access(handle, old_inode, old_inode_bh,
1245 OCFS2_JOURNAL_ACCESS_WRITE);
1246 if (status >= 0) {
1247 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1248
1249 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1250 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1251
1252 status = ocfs2_journal_dirty(handle, old_inode_bh);
1253 if (status < 0)
1254 mlog_errno(status);
1255 } else
1256 mlog_errno(status);
1257
1258 /* now that the name has been added to new_dir, remove the old name */
1259 status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1260 if (status < 0) {
1261 mlog_errno(status);
1262 goto bail;
1263 }
1264
1265 if (new_inode) {
1266 new_inode->i_nlink--;
1267 new_inode->i_ctime = CURRENT_TIME;
1268 }
1269 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1270 if (old_inode_de_bh) {
1271 status = ocfs2_journal_access(handle, old_inode,
1272 old_inode_de_bh,
1273 OCFS2_JOURNAL_ACCESS_WRITE);
1274 PARENT_INO(old_inode_de_bh->b_data) =
1275 cpu_to_le64(OCFS2_I(new_dir)->ip_blkno);
1276 status = ocfs2_journal_dirty(handle, old_inode_de_bh);
1277 old_dir->i_nlink--;
1278 if (new_inode) {
1279 new_inode->i_nlink--;
1280 } else {
1281 inc_nlink(new_dir);
1282 mark_inode_dirty(new_dir);
1283 }
1284 }
1285 mark_inode_dirty(old_dir);
1286 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1287 if (new_inode) {
1288 mark_inode_dirty(new_inode);
1289 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1290 }
1291
1292 if (old_dir != new_dir) {
1293 /* Keep the same times on both directories.*/
1294 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1295
1296 /*
1297 * This will also pick up the i_nlink change from the
1298 * block above.
1299 */
1300 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1301 }
1302
1303 if (old_dir_nlink != old_dir->i_nlink) {
1304 if (!old_dir_bh) {
1305 mlog(ML_ERROR, "need to change nlink for old dir "
1306 "%llu from %d to %d but bh is NULL!\n",
1307 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1308 (int)old_dir_nlink, old_dir->i_nlink);
1309 } else {
1310 struct ocfs2_dinode *fe;
1311 status = ocfs2_journal_access(handle, old_dir,
1312 old_dir_bh,
1313 OCFS2_JOURNAL_ACCESS_WRITE);
1314 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1315 fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1316 status = ocfs2_journal_dirty(handle, old_dir_bh);
1317 }
1318 }
1319
1320 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1321 status = 0;
1322 bail:
1323 if (rename_lock)
1324 ocfs2_rename_unlock(osb);
1325
1326 if (handle)
1327 ocfs2_commit_trans(osb, handle);
1328
1329 if (parents_locked)
1330 ocfs2_double_unlock(old_dir, new_dir);
1331
1332 if (old_child_locked)
1333 ocfs2_meta_unlock(old_inode, 1);
1334
1335 if (new_child_locked)
1336 ocfs2_meta_unlock(new_inode, 1);
1337
1338 if (orphan_dir) {
1339 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1340 ocfs2_meta_unlock(orphan_dir, 1);
1341 mutex_unlock(&orphan_dir->i_mutex);
1342 iput(orphan_dir);
1343 }
1344
1345 if (new_inode)
1346 sync_mapping_buffers(old_inode->i_mapping);
1347
1348 if (new_inode)
1349 iput(new_inode);
1350 if (newfe_bh)
1351 brelse(newfe_bh);
1352 if (old_inode_bh)
1353 brelse(old_inode_bh);
1354 if (old_dir_bh)
1355 brelse(old_dir_bh);
1356 if (new_dir_bh)
1357 brelse(new_dir_bh);
1358 if (new_de_bh)
1359 brelse(new_de_bh);
1360 if (old_de_bh)
1361 brelse(old_de_bh);
1362 if (old_inode_de_bh)
1363 brelse(old_inode_de_bh);
1364 if (orphan_entry_bh)
1365 brelse(orphan_entry_bh);
1366 if (insert_entry_bh)
1367 brelse(insert_entry_bh);
1368
1369 mlog_exit(status);
1370
1371 return status;
1372 }
1373
1374 /*
1375 * we expect i_size = strlen(symname). Copy symname into the file
1376 * data, including the null terminator.
1377 */
1378 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1379 handle_t *handle,
1380 struct inode *inode,
1381 const char *symname)
1382 {
1383 struct buffer_head **bhs = NULL;
1384 const char *c;
1385 struct super_block *sb = osb->sb;
1386 u64 p_blkno, p_blocks;
1387 int virtual, blocks, status, i, bytes_left;
1388
1389 bytes_left = i_size_read(inode) + 1;
1390 /* we can't trust i_blocks because we're actually going to
1391 * write i_size + 1 bytes. */
1392 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1393
1394 mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1395 (unsigned long long)inode->i_blocks,
1396 i_size_read(inode), blocks);
1397
1398 /* Sanity check -- make sure we're going to fit. */
1399 if (bytes_left >
1400 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1401 status = -EIO;
1402 mlog_errno(status);
1403 goto bail;
1404 }
1405
1406 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1407 if (!bhs) {
1408 status = -ENOMEM;
1409 mlog_errno(status);
1410 goto bail;
1411 }
1412
1413 status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1414 NULL);
1415 if (status < 0) {
1416 mlog_errno(status);
1417 goto bail;
1418 }
1419
1420 /* links can never be larger than one cluster so we know this
1421 * is all going to be contiguous, but do a sanity check
1422 * anyway. */
1423 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1424 status = -EIO;
1425 mlog_errno(status);
1426 goto bail;
1427 }
1428
1429 virtual = 0;
1430 while(bytes_left > 0) {
1431 c = &symname[virtual * sb->s_blocksize];
1432
1433 bhs[virtual] = sb_getblk(sb, p_blkno);
1434 if (!bhs[virtual]) {
1435 status = -ENOMEM;
1436 mlog_errno(status);
1437 goto bail;
1438 }
1439 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1440
1441 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1442 OCFS2_JOURNAL_ACCESS_CREATE);
1443 if (status < 0) {
1444 mlog_errno(status);
1445 goto bail;
1446 }
1447
1448 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1449
1450 memcpy(bhs[virtual]->b_data, c,
1451 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1452 bytes_left);
1453
1454 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1455 if (status < 0) {
1456 mlog_errno(status);
1457 goto bail;
1458 }
1459
1460 virtual++;
1461 p_blkno++;
1462 bytes_left -= sb->s_blocksize;
1463 }
1464
1465 status = 0;
1466 bail:
1467
1468 if (bhs) {
1469 for(i = 0; i < blocks; i++)
1470 if (bhs[i])
1471 brelse(bhs[i]);
1472 kfree(bhs);
1473 }
1474
1475 mlog_exit(status);
1476 return status;
1477 }
1478
1479 static int ocfs2_symlink(struct inode *dir,
1480 struct dentry *dentry,
1481 const char *symname)
1482 {
1483 int status, l, credits;
1484 u64 newsize;
1485 struct ocfs2_super *osb = NULL;
1486 struct inode *inode = NULL;
1487 struct super_block *sb;
1488 struct buffer_head *new_fe_bh = NULL;
1489 struct buffer_head *de_bh = NULL;
1490 struct buffer_head *parent_fe_bh = NULL;
1491 struct ocfs2_dinode *fe = NULL;
1492 struct ocfs2_dinode *dirfe;
1493 handle_t *handle = NULL;
1494 struct ocfs2_alloc_context *inode_ac = NULL;
1495 struct ocfs2_alloc_context *data_ac = NULL;
1496
1497 mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1498 dentry, symname, dentry->d_name.len, dentry->d_name.name);
1499
1500 sb = dir->i_sb;
1501 osb = OCFS2_SB(sb);
1502
1503 l = strlen(symname) + 1;
1504
1505 credits = ocfs2_calc_symlink_credits(sb);
1506
1507 /* lock the parent directory */
1508 status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
1509 if (status < 0) {
1510 if (status != -ENOENT)
1511 mlog_errno(status);
1512 return status;
1513 }
1514
1515 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1516 if (!dirfe->i_links_count) {
1517 /* can't make a file in a deleted directory. */
1518 status = -ENOENT;
1519 goto bail;
1520 }
1521
1522 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1523 dentry->d_name.len);
1524 if (status)
1525 goto bail;
1526
1527 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1528 dentry->d_name.name,
1529 dentry->d_name.len, &de_bh);
1530 if (status < 0) {
1531 mlog_errno(status);
1532 goto bail;
1533 }
1534
1535 status = ocfs2_reserve_new_inode(osb, &inode_ac);
1536 if (status < 0) {
1537 if (status != -ENOSPC)
1538 mlog_errno(status);
1539 goto bail;
1540 }
1541
1542 /* don't reserve bitmap space for fast symlinks. */
1543 if (l > ocfs2_fast_symlink_chars(sb)) {
1544 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
1545 if (status < 0) {
1546 if (status != -ENOSPC)
1547 mlog_errno(status);
1548 goto bail;
1549 }
1550 }
1551
1552 handle = ocfs2_start_trans(osb, credits);
1553 if (IS_ERR(handle)) {
1554 status = PTR_ERR(handle);
1555 handle = NULL;
1556 mlog_errno(status);
1557 goto bail;
1558 }
1559
1560 status = ocfs2_mknod_locked(osb, dir, dentry,
1561 S_IFLNK | S_IRWXUGO, 0,
1562 &new_fe_bh, parent_fe_bh, handle,
1563 &inode, inode_ac);
1564 if (status < 0) {
1565 mlog_errno(status);
1566 goto bail;
1567 }
1568
1569 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1570 inode->i_rdev = 0;
1571 newsize = l - 1;
1572 if (l > ocfs2_fast_symlink_chars(sb)) {
1573 u32 offset = 0;
1574
1575 inode->i_op = &ocfs2_symlink_inode_operations;
1576 status = ocfs2_do_extend_allocation(osb, inode, &offset, 1, 0,
1577 new_fe_bh,
1578 handle, data_ac, NULL,
1579 NULL);
1580 if (status < 0) {
1581 if (status != -ENOSPC && status != -EINTR) {
1582 mlog(ML_ERROR,
1583 "Failed to extend file to %llu\n",
1584 (unsigned long long)newsize);
1585 mlog_errno(status);
1586 status = -ENOSPC;
1587 }
1588 goto bail;
1589 }
1590 i_size_write(inode, newsize);
1591 inode->i_blocks = ocfs2_inode_sector_count(inode);
1592 } else {
1593 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1594 memcpy((char *) fe->id2.i_symlink, symname, l);
1595 i_size_write(inode, newsize);
1596 inode->i_blocks = 0;
1597 }
1598
1599 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1600 if (status < 0) {
1601 mlog_errno(status);
1602 goto bail;
1603 }
1604
1605 if (!ocfs2_inode_is_fast_symlink(inode)) {
1606 status = ocfs2_create_symlink_data(osb, handle, inode,
1607 symname);
1608 if (status < 0) {
1609 mlog_errno(status);
1610 goto bail;
1611 }
1612 }
1613
1614 status = ocfs2_add_entry(handle, dentry, inode,
1615 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1616 de_bh);
1617 if (status < 0) {
1618 mlog_errno(status);
1619 goto bail;
1620 }
1621
1622 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1623 if (status) {
1624 mlog_errno(status);
1625 goto bail;
1626 }
1627
1628 insert_inode_hash(inode);
1629 dentry->d_op = &ocfs2_dentry_ops;
1630 d_instantiate(dentry, inode);
1631 bail:
1632 if (handle)
1633 ocfs2_commit_trans(osb, handle);
1634
1635 ocfs2_meta_unlock(dir, 1);
1636
1637 if (new_fe_bh)
1638 brelse(new_fe_bh);
1639 if (parent_fe_bh)
1640 brelse(parent_fe_bh);
1641 if (de_bh)
1642 brelse(de_bh);
1643 if (inode_ac)
1644 ocfs2_free_alloc_context(inode_ac);
1645 if (data_ac)
1646 ocfs2_free_alloc_context(data_ac);
1647 if ((status < 0) && inode)
1648 iput(inode);
1649
1650 mlog_exit(status);
1651
1652 return status;
1653 }
1654
1655 static int ocfs2_blkno_stringify(u64 blkno, char *name)
1656 {
1657 int status, namelen;
1658
1659 mlog_entry_void();
1660
1661 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1662 (long long)blkno);
1663 if (namelen <= 0) {
1664 if (namelen)
1665 status = namelen;
1666 else
1667 status = -EINVAL;
1668 mlog_errno(status);
1669 goto bail;
1670 }
1671 if (namelen != OCFS2_ORPHAN_NAMELEN) {
1672 status = -EINVAL;
1673 mlog_errno(status);
1674 goto bail;
1675 }
1676
1677 mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
1678 namelen);
1679
1680 status = 0;
1681 bail:
1682 mlog_exit(status);
1683 return status;
1684 }
1685
1686 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
1687 struct inode **ret_orphan_dir,
1688 struct inode *inode,
1689 char *name,
1690 struct buffer_head **de_bh)
1691 {
1692 struct inode *orphan_dir_inode;
1693 struct buffer_head *orphan_dir_bh = NULL;
1694 int status = 0;
1695
1696 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1697 if (status < 0) {
1698 mlog_errno(status);
1699 return status;
1700 }
1701
1702 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
1703 ORPHAN_DIR_SYSTEM_INODE,
1704 osb->slot_num);
1705 if (!orphan_dir_inode) {
1706 status = -ENOENT;
1707 mlog_errno(status);
1708 return status;
1709 }
1710
1711 mutex_lock(&orphan_dir_inode->i_mutex);
1712
1713 status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1);
1714 if (status < 0) {
1715 mlog_errno(status);
1716 goto leave;
1717 }
1718
1719 status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
1720 orphan_dir_bh, name,
1721 OCFS2_ORPHAN_NAMELEN, de_bh);
1722 if (status < 0) {
1723 ocfs2_meta_unlock(orphan_dir_inode, 1);
1724
1725 mlog_errno(status);
1726 goto leave;
1727 }
1728
1729 *ret_orphan_dir = orphan_dir_inode;
1730
1731 leave:
1732 if (status) {
1733 mutex_unlock(&orphan_dir_inode->i_mutex);
1734 iput(orphan_dir_inode);
1735 }
1736
1737 if (orphan_dir_bh)
1738 brelse(orphan_dir_bh);
1739
1740 mlog_exit(status);
1741 return status;
1742 }
1743
1744 static int ocfs2_orphan_add(struct ocfs2_super *osb,
1745 handle_t *handle,
1746 struct inode *inode,
1747 struct ocfs2_dinode *fe,
1748 char *name,
1749 struct buffer_head *de_bh,
1750 struct inode *orphan_dir_inode)
1751 {
1752 struct buffer_head *orphan_dir_bh = NULL;
1753 int status = 0;
1754 struct ocfs2_dinode *orphan_fe;
1755
1756 mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
1757
1758 status = ocfs2_read_block(osb,
1759 OCFS2_I(orphan_dir_inode)->ip_blkno,
1760 &orphan_dir_bh, OCFS2_BH_CACHED,
1761 orphan_dir_inode);
1762 if (status < 0) {
1763 mlog_errno(status);
1764 goto leave;
1765 }
1766
1767 status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
1768 OCFS2_JOURNAL_ACCESS_WRITE);
1769 if (status < 0) {
1770 mlog_errno(status);
1771 goto leave;
1772 }
1773
1774 /* we're a cluster, and nlink can change on disk from
1775 * underneath us... */
1776 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1777 if (S_ISDIR(inode->i_mode))
1778 le16_add_cpu(&orphan_fe->i_links_count, 1);
1779 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
1780
1781 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
1782 if (status < 0) {
1783 mlog_errno(status);
1784 goto leave;
1785 }
1786
1787 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
1788 OCFS2_ORPHAN_NAMELEN, inode,
1789 OCFS2_I(inode)->ip_blkno,
1790 orphan_dir_bh, de_bh);
1791 if (status < 0) {
1792 mlog_errno(status);
1793 goto leave;
1794 }
1795
1796 le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
1797
1798 /* Record which orphan dir our inode now resides
1799 * in. delete_inode will use this to determine which orphan
1800 * dir to lock. */
1801 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
1802
1803 mlog(0, "Inode %llu orphaned in slot %d\n",
1804 (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
1805
1806 leave:
1807 if (orphan_dir_bh)
1808 brelse(orphan_dir_bh);
1809
1810 mlog_exit(status);
1811 return status;
1812 }
1813
1814 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
1815 int ocfs2_orphan_del(struct ocfs2_super *osb,
1816 handle_t *handle,
1817 struct inode *orphan_dir_inode,
1818 struct inode *inode,
1819 struct buffer_head *orphan_dir_bh)
1820 {
1821 char name[OCFS2_ORPHAN_NAMELEN + 1];
1822 struct ocfs2_dinode *orphan_fe;
1823 int status = 0;
1824 struct buffer_head *target_de_bh = NULL;
1825 struct ocfs2_dir_entry *target_de = NULL;
1826
1827 mlog_entry_void();
1828
1829 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1830 if (status < 0) {
1831 mlog_errno(status);
1832 goto leave;
1833 }
1834
1835 mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
1836 name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
1837 OCFS2_ORPHAN_NAMELEN);
1838
1839 /* find it's spot in the orphan directory */
1840 target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
1841 orphan_dir_inode, &target_de);
1842 if (!target_de_bh) {
1843 status = -ENOENT;
1844 mlog_errno(status);
1845 goto leave;
1846 }
1847
1848 /* remove it from the orphan directory */
1849 status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
1850 target_de_bh);
1851 if (status < 0) {
1852 mlog_errno(status);
1853 goto leave;
1854 }
1855
1856 status = ocfs2_journal_access(handle,orphan_dir_inode, orphan_dir_bh,
1857 OCFS2_JOURNAL_ACCESS_WRITE);
1858 if (status < 0) {
1859 mlog_errno(status);
1860 goto leave;
1861 }
1862
1863 /* do the i_nlink dance! :) */
1864 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1865 if (S_ISDIR(inode->i_mode))
1866 le16_add_cpu(&orphan_fe->i_links_count, -1);
1867 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
1868
1869 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
1870 if (status < 0) {
1871 mlog_errno(status);
1872 goto leave;
1873 }
1874
1875 leave:
1876 if (target_de_bh)
1877 brelse(target_de_bh);
1878
1879 mlog_exit(status);
1880 return status;
1881 }
1882
1883 const struct inode_operations ocfs2_dir_iops = {
1884 .create = ocfs2_create,
1885 .lookup = ocfs2_lookup,
1886 .link = ocfs2_link,
1887 .unlink = ocfs2_unlink,
1888 .rmdir = ocfs2_unlink,
1889 .symlink = ocfs2_symlink,
1890 .mkdir = ocfs2_mkdir,
1891 .mknod = ocfs2_mknod,
1892 .rename = ocfs2_rename,
1893 .setattr = ocfs2_setattr,
1894 .getattr = ocfs2_getattr,
1895 .permission = ocfs2_permission,
1896 };
kernel source for telekom puls (alcatel/mediatek)