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p54: fix misbehavings when firmware can't be found
[linux-2.6/mini2440.git] / fs / ocfs2 / namei.c
blob485a6aa0ad39060e9eb27f2897be98026b886d4c
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 "xattr.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_inode_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, 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 downconvert thread and have a stale dentry. */
180 ocfs2_inode_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_inode_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 /* Reserve a cluster if creating an extent based directory. */
254 if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
255 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
256 if (status < 0) {
257 if (status != -ENOSPC)
258 mlog_errno(status);
259 goto leave;
260 }
261 }
262
263 handle = ocfs2_start_trans(osb, OCFS2_MKNOD_CREDITS);
264 if (IS_ERR(handle)) {
265 status = PTR_ERR(handle);
266 handle = NULL;
267 mlog_errno(status);
268 goto leave;
269 }
270
271 /* do the real work now. */
272 status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
273 &new_fe_bh, parent_fe_bh, handle,
274 &inode, inode_ac);
275 if (status < 0) {
276 mlog_errno(status);
277 goto leave;
278 }
279
280 if (S_ISDIR(mode)) {
281 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
282 new_fe_bh, data_ac);
283 if (status < 0) {
284 mlog_errno(status);
285 goto leave;
286 }
287
288 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
289 OCFS2_JOURNAL_ACCESS_WRITE);
290 if (status < 0) {
291 mlog_errno(status);
292 goto leave;
293 }
294 le16_add_cpu(&dirfe->i_links_count, 1);
295 status = ocfs2_journal_dirty(handle, parent_fe_bh);
296 if (status < 0) {
297 mlog_errno(status);
298 goto leave;
299 }
300 inc_nlink(dir);
301 }
302
303 status = ocfs2_add_entry(handle, dentry, inode,
304 OCFS2_I(inode)->ip_blkno, parent_fe_bh,
305 de_bh);
306 if (status < 0) {
307 mlog_errno(status);
308 goto leave;
309 }
310
311 status = ocfs2_dentry_attach_lock(dentry, inode,
312 OCFS2_I(dir)->ip_blkno);
313 if (status) {
314 mlog_errno(status);
315 goto leave;
316 }
317
318 insert_inode_hash(inode);
319 dentry->d_op = &ocfs2_dentry_ops;
320 d_instantiate(dentry, inode);
321 status = 0;
322 leave:
323 if (handle)
324 ocfs2_commit_trans(osb, handle);
325
326 ocfs2_inode_unlock(dir, 1);
327
328 if (status == -ENOSPC)
329 mlog(0, "Disk is full\n");
330
331 brelse(new_fe_bh);
332 brelse(de_bh);
333 brelse(parent_fe_bh);
334
335 if ((status < 0) && inode)
336 iput(inode);
337
338 if (inode_ac)
339 ocfs2_free_alloc_context(inode_ac);
340
341 if (data_ac)
342 ocfs2_free_alloc_context(data_ac);
343
344 mlog_exit(status);
345
346 return status;
347 }
348
349 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
350 struct inode *dir,
351 struct dentry *dentry, int mode,
352 dev_t dev,
353 struct buffer_head **new_fe_bh,
354 struct buffer_head *parent_fe_bh,
355 handle_t *handle,
356 struct inode **ret_inode,
357 struct ocfs2_alloc_context *inode_ac)
358 {
359 int status = 0;
360 struct ocfs2_dinode *fe = NULL;
361 struct ocfs2_extent_list *fel;
362 u64 fe_blkno = 0;
363 u16 suballoc_bit;
364 struct inode *inode = NULL;
365
366 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
367 (unsigned long)dev, dentry->d_name.len,
368 dentry->d_name.name);
369
370 *new_fe_bh = NULL;
371 *ret_inode = NULL;
372
373 status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
374 &fe_blkno);
375 if (status < 0) {
376 mlog_errno(status);
377 goto leave;
378 }
379
380 inode = new_inode(dir->i_sb);
381 if (IS_ERR(inode)) {
382 status = PTR_ERR(inode);
383 mlog(ML_ERROR, "new_inode failed!\n");
384 goto leave;
385 }
386
387 /* populate as many fields early on as possible - many of
388 * these are used by the support functions here and in
389 * callers. */
390 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
391 OCFS2_I(inode)->ip_blkno = fe_blkno;
392 if (S_ISDIR(mode))
393 inode->i_nlink = 2;
394 else
395 inode->i_nlink = 1;
396 inode->i_mode = mode;
397 spin_lock(&osb->osb_lock);
398 inode->i_generation = osb->s_next_generation++;
399 spin_unlock(&osb->osb_lock);
400
401 *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
402 if (!*new_fe_bh) {
403 status = -EIO;
404 mlog_errno(status);
405 goto leave;
406 }
407 ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
408
409 status = ocfs2_journal_access(handle, inode, *new_fe_bh,
410 OCFS2_JOURNAL_ACCESS_CREATE);
411 if (status < 0) {
412 mlog_errno(status);
413 goto leave;
414 }
415
416 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
417 memset(fe, 0, osb->sb->s_blocksize);
418
419 fe->i_generation = cpu_to_le32(inode->i_generation);
420 fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
421 fe->i_blkno = cpu_to_le64(fe_blkno);
422 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
423 fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot);
424 fe->i_uid = cpu_to_le32(current->fsuid);
425 if (dir->i_mode & S_ISGID) {
426 fe->i_gid = cpu_to_le32(dir->i_gid);
427 if (S_ISDIR(mode))
428 mode |= S_ISGID;
429 } else
430 fe->i_gid = cpu_to_le32(current->fsgid);
431 fe->i_mode = cpu_to_le16(mode);
432 if (S_ISCHR(mode) || S_ISBLK(mode))
433 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
434
435 fe->i_links_count = cpu_to_le16(inode->i_nlink);
436
437 fe->i_last_eb_blk = 0;
438 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
439 le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
440 fe->i_atime = fe->i_ctime = fe->i_mtime =
441 cpu_to_le64(CURRENT_TIME.tv_sec);
442 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
443 cpu_to_le32(CURRENT_TIME.tv_nsec);
444 fe->i_dtime = 0;
445
446 /*
447 * If supported, directories start with inline data.
448 */
449 if (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) {
450 u16 feat = le16_to_cpu(fe->i_dyn_features);
451
452 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
453
454 fe->id2.i_data.id_count = cpu_to_le16(ocfs2_max_inline_data(osb->sb));
455 } else {
456 fel = &fe->id2.i_list;
457 fel->l_tree_depth = 0;
458 fel->l_next_free_rec = 0;
459 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
460 }
461
462 status = ocfs2_journal_dirty(handle, *new_fe_bh);
463 if (status < 0) {
464 mlog_errno(status);
465 goto leave;
466 }
467
468 if (ocfs2_populate_inode(inode, fe, 1) < 0) {
469 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
470 "i_blkno=%llu, i_ino=%lu\n",
471 (unsigned long long)(*new_fe_bh)->b_blocknr,
472 (unsigned long long)le64_to_cpu(fe->i_blkno),
473 inode->i_ino);
474 BUG();
475 }
476
477 ocfs2_inode_set_new(osb, inode);
478 if (!ocfs2_mount_local(osb)) {
479 status = ocfs2_create_new_inode_locks(inode);
480 if (status < 0)
481 mlog_errno(status);
482 }
483
484 status = 0; /* error in ocfs2_create_new_inode_locks is not
485 * critical */
486
487 *ret_inode = inode;
488 leave:
489 if (status < 0) {
490 if (*new_fe_bh) {
491 brelse(*new_fe_bh);
492 *new_fe_bh = NULL;
493 }
494 if (inode)
495 iput(inode);
496 }
497
498 mlog_exit(status);
499 return status;
500 }
501
502 static int ocfs2_mkdir(struct inode *dir,
503 struct dentry *dentry,
504 int mode)
505 {
506 int ret;
507
508 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
509 dentry->d_name.len, dentry->d_name.name);
510 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
511 mlog_exit(ret);
512
513 return ret;
514 }
515
516 static int ocfs2_create(struct inode *dir,
517 struct dentry *dentry,
518 int mode,
519 struct nameidata *nd)
520 {
521 int ret;
522
523 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
524 dentry->d_name.len, dentry->d_name.name);
525 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
526 mlog_exit(ret);
527
528 return ret;
529 }
530
531 static int ocfs2_link(struct dentry *old_dentry,
532 struct inode *dir,
533 struct dentry *dentry)
534 {
535 handle_t *handle;
536 struct inode *inode = old_dentry->d_inode;
537 int err;
538 struct buffer_head *fe_bh = NULL;
539 struct buffer_head *parent_fe_bh = NULL;
540 struct buffer_head *de_bh = NULL;
541 struct ocfs2_dinode *fe = NULL;
542 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
543
544 mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
545 old_dentry->d_name.len, old_dentry->d_name.name,
546 dentry->d_name.len, dentry->d_name.name);
547
548 if (S_ISDIR(inode->i_mode))
549 return -EPERM;
550
551 err = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
552 if (err < 0) {
553 if (err != -ENOENT)
554 mlog_errno(err);
555 return err;
556 }
557
558 if (!dir->i_nlink) {
559 err = -ENOENT;
560 goto out;
561 }
562
563 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
564 dentry->d_name.len);
565 if (err)
566 goto out;
567
568 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
569 dentry->d_name.name,
570 dentry->d_name.len, &de_bh);
571 if (err < 0) {
572 mlog_errno(err);
573 goto out;
574 }
575
576 err = ocfs2_inode_lock(inode, &fe_bh, 1);
577 if (err < 0) {
578 if (err != -ENOENT)
579 mlog_errno(err);
580 goto out;
581 }
582
583 fe = (struct ocfs2_dinode *) fe_bh->b_data;
584 if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
585 err = -EMLINK;
586 goto out_unlock_inode;
587 }
588
589 handle = ocfs2_start_trans(osb, OCFS2_LINK_CREDITS);
590 if (IS_ERR(handle)) {
591 err = PTR_ERR(handle);
592 handle = NULL;
593 mlog_errno(err);
594 goto out_unlock_inode;
595 }
596
597 err = ocfs2_journal_access(handle, inode, fe_bh,
598 OCFS2_JOURNAL_ACCESS_WRITE);
599 if (err < 0) {
600 mlog_errno(err);
601 goto out_commit;
602 }
603
604 inc_nlink(inode);
605 inode->i_ctime = CURRENT_TIME;
606 fe->i_links_count = cpu_to_le16(inode->i_nlink);
607 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
608 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
609
610 err = ocfs2_journal_dirty(handle, fe_bh);
611 if (err < 0) {
612 le16_add_cpu(&fe->i_links_count, -1);
613 drop_nlink(inode);
614 mlog_errno(err);
615 goto out_commit;
616 }
617
618 err = ocfs2_add_entry(handle, dentry, inode,
619 OCFS2_I(inode)->ip_blkno,
620 parent_fe_bh, de_bh);
621 if (err) {
622 le16_add_cpu(&fe->i_links_count, -1);
623 drop_nlink(inode);
624 mlog_errno(err);
625 goto out_commit;
626 }
627
628 err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
629 if (err) {
630 mlog_errno(err);
631 goto out_commit;
632 }
633
634 atomic_inc(&inode->i_count);
635 dentry->d_op = &ocfs2_dentry_ops;
636 d_instantiate(dentry, inode);
637
638 out_commit:
639 ocfs2_commit_trans(osb, handle);
640 out_unlock_inode:
641 ocfs2_inode_unlock(inode, 1);
642
643 out:
644 ocfs2_inode_unlock(dir, 1);
645
646 brelse(de_bh);
647 brelse(fe_bh);
648 brelse(parent_fe_bh);
649
650 mlog_exit(err);
651
652 return err;
653 }
654
655 /*
656 * Takes and drops an exclusive lock on the given dentry. This will
657 * force other nodes to drop it.
658 */
659 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
660 {
661 int ret;
662
663 ret = ocfs2_dentry_lock(dentry, 1);
664 if (ret)
665 mlog_errno(ret);
666 else
667 ocfs2_dentry_unlock(dentry, 1);
668
669 return ret;
670 }
671
672 static inline int inode_is_unlinkable(struct inode *inode)
673 {
674 if (S_ISDIR(inode->i_mode)) {
675 if (inode->i_nlink == 2)
676 return 1;
677 return 0;
678 }
679
680 if (inode->i_nlink == 1)
681 return 1;
682 return 0;
683 }
684
685 static int ocfs2_unlink(struct inode *dir,
686 struct dentry *dentry)
687 {
688 int status;
689 int child_locked = 0;
690 struct inode *inode = dentry->d_inode;
691 struct inode *orphan_dir = NULL;
692 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
693 u64 blkno;
694 struct ocfs2_dinode *fe = NULL;
695 struct buffer_head *fe_bh = NULL;
696 struct buffer_head *parent_node_bh = NULL;
697 handle_t *handle = NULL;
698 struct ocfs2_dir_entry *dirent = NULL;
699 struct buffer_head *dirent_bh = NULL;
700 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
701 struct buffer_head *orphan_entry_bh = NULL;
702
703 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
704 dentry->d_name.len, dentry->d_name.name);
705
706 BUG_ON(dentry->d_parent->d_inode != dir);
707
708 mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
709
710 if (inode == osb->root_inode) {
711 mlog(0, "Cannot delete the root directory\n");
712 return -EPERM;
713 }
714
715 status = ocfs2_inode_lock(dir, &parent_node_bh, 1);
716 if (status < 0) {
717 if (status != -ENOENT)
718 mlog_errno(status);
719 return status;
720 }
721
722 status = ocfs2_find_files_on_disk(dentry->d_name.name,
723 dentry->d_name.len, &blkno,
724 dir, &dirent_bh, &dirent);
725 if (status < 0) {
726 if (status != -ENOENT)
727 mlog_errno(status);
728 goto leave;
729 }
730
731 if (OCFS2_I(inode)->ip_blkno != blkno) {
732 status = -ENOENT;
733
734 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
735 (unsigned long long)OCFS2_I(inode)->ip_blkno,
736 (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
737 goto leave;
738 }
739
740 status = ocfs2_inode_lock(inode, &fe_bh, 1);
741 if (status < 0) {
742 if (status != -ENOENT)
743 mlog_errno(status);
744 goto leave;
745 }
746 child_locked = 1;
747
748 if (S_ISDIR(inode->i_mode)) {
749 if (!ocfs2_empty_dir(inode)) {
750 status = -ENOTEMPTY;
751 goto leave;
752 } else if (inode->i_nlink != 2) {
753 status = -ENOTEMPTY;
754 goto leave;
755 }
756 }
757
758 status = ocfs2_remote_dentry_delete(dentry);
759 if (status < 0) {
760 /* This remote delete should succeed under all normal
761 * circumstances. */
762 mlog_errno(status);
763 goto leave;
764 }
765
766 if (inode_is_unlinkable(inode)) {
767 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
768 orphan_name,
769 &orphan_entry_bh);
770 if (status < 0) {
771 mlog_errno(status);
772 goto leave;
773 }
774 }
775
776 handle = ocfs2_start_trans(osb, OCFS2_UNLINK_CREDITS);
777 if (IS_ERR(handle)) {
778 status = PTR_ERR(handle);
779 handle = NULL;
780 mlog_errno(status);
781 goto leave;
782 }
783
784 status = ocfs2_journal_access(handle, inode, fe_bh,
785 OCFS2_JOURNAL_ACCESS_WRITE);
786 if (status < 0) {
787 mlog_errno(status);
788 goto leave;
789 }
790
791 fe = (struct ocfs2_dinode *) fe_bh->b_data;
792
793 if (inode_is_unlinkable(inode)) {
794 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
795 orphan_entry_bh, orphan_dir);
796 if (status < 0) {
797 mlog_errno(status);
798 goto leave;
799 }
800 }
801
802 /* delete the name from the parent dir */
803 status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
804 if (status < 0) {
805 mlog_errno(status);
806 goto leave;
807 }
808
809 if (S_ISDIR(inode->i_mode))
810 drop_nlink(inode);
811 drop_nlink(inode);
812 fe->i_links_count = cpu_to_le16(inode->i_nlink);
813
814 status = ocfs2_journal_dirty(handle, fe_bh);
815 if (status < 0) {
816 mlog_errno(status);
817 goto leave;
818 }
819
820 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
821 if (S_ISDIR(inode->i_mode))
822 drop_nlink(dir);
823
824 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
825 if (status < 0) {
826 mlog_errno(status);
827 if (S_ISDIR(inode->i_mode))
828 inc_nlink(dir);
829 }
830
831 leave:
832 if (handle)
833 ocfs2_commit_trans(osb, handle);
834
835 if (child_locked)
836 ocfs2_inode_unlock(inode, 1);
837
838 ocfs2_inode_unlock(dir, 1);
839
840 if (orphan_dir) {
841 /* This was locked for us in ocfs2_prepare_orphan_dir() */
842 ocfs2_inode_unlock(orphan_dir, 1);
843 mutex_unlock(&orphan_dir->i_mutex);
844 iput(orphan_dir);
845 }
846
847 brelse(fe_bh);
848 brelse(dirent_bh);
849 brelse(parent_node_bh);
850 brelse(orphan_entry_bh);
851
852 mlog_exit(status);
853
854 return status;
855 }
856
857 /*
858 * The only place this should be used is rename!
859 * if they have the same id, then the 1st one is the only one locked.
860 */
861 static int ocfs2_double_lock(struct ocfs2_super *osb,
862 struct buffer_head **bh1,
863 struct inode *inode1,
864 struct buffer_head **bh2,
865 struct inode *inode2)
866 {
867 int status;
868 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
869 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
870 struct buffer_head **tmpbh;
871 struct inode *tmpinode;
872
873 mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
874 (unsigned long long)oi1->ip_blkno,
875 (unsigned long long)oi2->ip_blkno);
876
877 if (*bh1)
878 *bh1 = NULL;
879 if (*bh2)
880 *bh2 = NULL;
881
882 /* we always want to lock the one with the lower lockid first. */
883 if (oi1->ip_blkno != oi2->ip_blkno) {
884 if (oi1->ip_blkno < oi2->ip_blkno) {
885 /* switch id1 and id2 around */
886 mlog(0, "switching them around...\n");
887 tmpbh = bh2;
888 bh2 = bh1;
889 bh1 = tmpbh;
890
891 tmpinode = inode2;
892 inode2 = inode1;
893 inode1 = tmpinode;
894 }
895 /* lock id2 */
896 status = ocfs2_inode_lock(inode2, bh2, 1);
897 if (status < 0) {
898 if (status != -ENOENT)
899 mlog_errno(status);
900 goto bail;
901 }
902 }
903
904 /* lock id1 */
905 status = ocfs2_inode_lock(inode1, bh1, 1);
906 if (status < 0) {
907 /*
908 * An error return must mean that no cluster locks
909 * were held on function exit.
910 */
911 if (oi1->ip_blkno != oi2->ip_blkno)
912 ocfs2_inode_unlock(inode2, 1);
913
914 if (status != -ENOENT)
915 mlog_errno(status);
916 }
917
918 bail:
919 mlog_exit(status);
920 return status;
921 }
922
923 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
924 {
925 ocfs2_inode_unlock(inode1, 1);
926
927 if (inode1 != inode2)
928 ocfs2_inode_unlock(inode2, 1);
929 }
930
931 static int ocfs2_rename(struct inode *old_dir,
932 struct dentry *old_dentry,
933 struct inode *new_dir,
934 struct dentry *new_dentry)
935 {
936 int status = 0, rename_lock = 0, parents_locked = 0;
937 int old_child_locked = 0, new_child_locked = 0;
938 struct inode *old_inode = old_dentry->d_inode;
939 struct inode *new_inode = new_dentry->d_inode;
940 struct inode *orphan_dir = NULL;
941 struct ocfs2_dinode *newfe = NULL;
942 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
943 struct buffer_head *orphan_entry_bh = NULL;
944 struct buffer_head *newfe_bh = NULL;
945 struct buffer_head *old_inode_bh = NULL;
946 struct buffer_head *insert_entry_bh = NULL;
947 struct ocfs2_super *osb = NULL;
948 u64 newfe_blkno, old_de_ino;
949 handle_t *handle = NULL;
950 struct buffer_head *old_dir_bh = NULL;
951 struct buffer_head *new_dir_bh = NULL;
952 struct ocfs2_dir_entry *old_inode_dot_dot_de = NULL, *old_de = NULL,
953 *new_de = NULL;
954 struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
955 struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
956 // this is the 1st dirent bh
957 nlink_t old_dir_nlink = old_dir->i_nlink;
958 struct ocfs2_dinode *old_di;
959
960 /* At some point it might be nice to break this function up a
961 * bit. */
962
963 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
964 old_dir, old_dentry, new_dir, new_dentry,
965 old_dentry->d_name.len, old_dentry->d_name.name,
966 new_dentry->d_name.len, new_dentry->d_name.name);
967
968 osb = OCFS2_SB(old_dir->i_sb);
969
970 if (new_inode) {
971 if (!igrab(new_inode))
972 BUG();
973 }
974
975 /* Assume a directory hierarchy thusly:
976 * a/b/c
977 * a/d
978 * a,b,c, and d are all directories.
979 *
980 * from cwd of 'a' on both nodes:
981 * node1: mv b/c d
982 * node2: mv d b/c
983 *
984 * And that's why, just like the VFS, we need a file system
985 * rename lock. */
986 if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
987 status = ocfs2_rename_lock(osb);
988 if (status < 0) {
989 mlog_errno(status);
990 goto bail;
991 }
992 rename_lock = 1;
993 }
994
995 /* if old and new are the same, this'll just do one lock. */
996 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
997 &new_dir_bh, new_dir);
998 if (status < 0) {
999 mlog_errno(status);
1000 goto bail;
1001 }
1002 parents_locked = 1;
1003
1004 /* make sure both dirs have bhs
1005 * get an extra ref on old_dir_bh if old==new */
1006 if (!new_dir_bh) {
1007 if (old_dir_bh) {
1008 new_dir_bh = old_dir_bh;
1009 get_bh(new_dir_bh);
1010 } else {
1011 mlog(ML_ERROR, "no old_dir_bh!\n");
1012 status = -EIO;
1013 goto bail;
1014 }
1015 }
1016
1017 /*
1018 * Aside from allowing a meta data update, the locking here
1019 * also ensures that the downconvert thread on other nodes
1020 * won't have to concurrently downconvert the inode and the
1021 * dentry locks.
1022 */
1023 status = ocfs2_inode_lock(old_inode, &old_inode_bh, 1);
1024 if (status < 0) {
1025 if (status != -ENOENT)
1026 mlog_errno(status);
1027 goto bail;
1028 }
1029 old_child_locked = 1;
1030
1031 status = ocfs2_remote_dentry_delete(old_dentry);
1032 if (status < 0) {
1033 mlog_errno(status);
1034 goto bail;
1035 }
1036
1037 if (S_ISDIR(old_inode->i_mode)) {
1038 u64 old_inode_parent;
1039
1040 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1041 old_inode, &old_inode_de_bh,
1042 &old_inode_dot_dot_de);
1043 if (status) {
1044 status = -EIO;
1045 goto bail;
1046 }
1047
1048 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1049 status = -EIO;
1050 goto bail;
1051 }
1052
1053 if (!new_inode && new_dir != old_dir &&
1054 new_dir->i_nlink >= OCFS2_LINK_MAX) {
1055 status = -EMLINK;
1056 goto bail;
1057 }
1058 }
1059
1060 status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1061 old_dentry->d_name.len,
1062 &old_de_ino);
1063 if (status) {
1064 status = -ENOENT;
1065 goto bail;
1066 }
1067
1068 /*
1069 * Check for inode number is _not_ due to possible IO errors.
1070 * We might rmdir the source, keep it as pwd of some process
1071 * and merrily kill the link to whatever was created under the
1072 * same name. Goodbye sticky bit ;-<
1073 */
1074 if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1075 status = -ENOENT;
1076 goto bail;
1077 }
1078
1079 /* check if the target already exists (in which case we need
1080 * to delete it */
1081 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1082 new_dentry->d_name.len,
1083 &newfe_blkno, new_dir, &new_de_bh,
1084 &new_de);
1085 /* The only error we allow here is -ENOENT because the new
1086 * file not existing is perfectly valid. */
1087 if ((status < 0) && (status != -ENOENT)) {
1088 /* If we cannot find the file specified we should just */
1089 /* return the error... */
1090 mlog_errno(status);
1091 goto bail;
1092 }
1093
1094 if (!new_de && new_inode) {
1095 /*
1096 * Target was unlinked by another node while we were
1097 * waiting to get to ocfs2_rename(). There isn't
1098 * anything we can do here to help the situation, so
1099 * bubble up the appropriate error.
1100 */
1101 status = -ENOENT;
1102 goto bail;
1103 }
1104
1105 /* In case we need to overwrite an existing file, we blow it
1106 * away first */
1107 if (new_de) {
1108 /* VFS didn't think there existed an inode here, but
1109 * someone else in the cluster must have raced our
1110 * rename to create one. Today we error cleanly, in
1111 * the future we should consider calling iget to build
1112 * a new struct inode for this entry. */
1113 if (!new_inode) {
1114 status = -EACCES;
1115
1116 mlog(0, "We found an inode for name %.*s but VFS "
1117 "didn't give us one.\n", new_dentry->d_name.len,
1118 new_dentry->d_name.name);
1119 goto bail;
1120 }
1121
1122 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1123 status = -EACCES;
1124
1125 mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1126 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1127 (unsigned long long)newfe_blkno,
1128 OCFS2_I(new_inode)->ip_flags);
1129 goto bail;
1130 }
1131
1132 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1133 if (status < 0) {
1134 if (status != -ENOENT)
1135 mlog_errno(status);
1136 goto bail;
1137 }
1138 new_child_locked = 1;
1139
1140 status = ocfs2_remote_dentry_delete(new_dentry);
1141 if (status < 0) {
1142 mlog_errno(status);
1143 goto bail;
1144 }
1145
1146 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1147
1148 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1149 "newfebh=%p bhblocknr=%llu\n", new_de,
1150 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1151 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1152
1153 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1154 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1155 new_inode,
1156 orphan_name,
1157 &orphan_entry_bh);
1158 if (status < 0) {
1159 mlog_errno(status);
1160 goto bail;
1161 }
1162 }
1163 } else {
1164 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1165
1166 status = ocfs2_check_dir_for_entry(new_dir,
1167 new_dentry->d_name.name,
1168 new_dentry->d_name.len);
1169 if (status)
1170 goto bail;
1171
1172 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1173 new_dentry->d_name.name,
1174 new_dentry->d_name.len,
1175 &insert_entry_bh);
1176 if (status < 0) {
1177 mlog_errno(status);
1178 goto bail;
1179 }
1180 }
1181
1182 handle = ocfs2_start_trans(osb, OCFS2_RENAME_CREDITS);
1183 if (IS_ERR(handle)) {
1184 status = PTR_ERR(handle);
1185 handle = NULL;
1186 mlog_errno(status);
1187 goto bail;
1188 }
1189
1190 if (new_de) {
1191 if (S_ISDIR(new_inode->i_mode)) {
1192 if (!ocfs2_empty_dir(new_inode) ||
1193 new_inode->i_nlink != 2) {
1194 status = -ENOTEMPTY;
1195 goto bail;
1196 }
1197 }
1198 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1199 OCFS2_JOURNAL_ACCESS_WRITE);
1200 if (status < 0) {
1201 mlog_errno(status);
1202 goto bail;
1203 }
1204
1205 if (S_ISDIR(new_inode->i_mode) ||
1206 (newfe->i_links_count == cpu_to_le16(1))){
1207 status = ocfs2_orphan_add(osb, handle, new_inode,
1208 newfe, orphan_name,
1209 orphan_entry_bh, orphan_dir);
1210 if (status < 0) {
1211 mlog_errno(status);
1212 goto bail;
1213 }
1214 }
1215
1216 /* change the dirent to point to the correct inode */
1217 status = ocfs2_update_entry(new_dir, handle, new_de_bh,
1218 new_de, old_inode);
1219 if (status < 0) {
1220 mlog_errno(status);
1221 goto bail;
1222 }
1223 new_dir->i_version++;
1224
1225 if (S_ISDIR(new_inode->i_mode))
1226 newfe->i_links_count = 0;
1227 else
1228 le16_add_cpu(&newfe->i_links_count, -1);
1229
1230 status = ocfs2_journal_dirty(handle, newfe_bh);
1231 if (status < 0) {
1232 mlog_errno(status);
1233 goto bail;
1234 }
1235 } else {
1236 /* if the name was not found in new_dir, add it now */
1237 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1238 OCFS2_I(old_inode)->ip_blkno,
1239 new_dir_bh, insert_entry_bh);
1240 }
1241
1242 old_inode->i_ctime = CURRENT_TIME;
1243 mark_inode_dirty(old_inode);
1244
1245 status = ocfs2_journal_access(handle, old_inode, old_inode_bh,
1246 OCFS2_JOURNAL_ACCESS_WRITE);
1247 if (status >= 0) {
1248 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1249
1250 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1251 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1252
1253 status = ocfs2_journal_dirty(handle, old_inode_bh);
1254 if (status < 0)
1255 mlog_errno(status);
1256 } else
1257 mlog_errno(status);
1258
1259 /*
1260 * Now that the name has been added to new_dir, remove the old name.
1261 *
1262 * We don't keep any directory entry context around until now
1263 * because the insert might have changed the type of directory
1264 * we're dealing with.
1265 */
1266 old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1267 old_dentry->d_name.len,
1268 old_dir, &old_de);
1269 if (!old_de_bh) {
1270 status = -EIO;
1271 goto bail;
1272 }
1273
1274 status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1275 if (status < 0) {
1276 mlog_errno(status);
1277 goto bail;
1278 }
1279
1280 if (new_inode) {
1281 new_inode->i_nlink--;
1282 new_inode->i_ctime = CURRENT_TIME;
1283 }
1284 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1285 if (old_inode_de_bh) {
1286 status = ocfs2_update_entry(old_inode, handle, old_inode_de_bh,
1287 old_inode_dot_dot_de, new_dir);
1288 old_dir->i_nlink--;
1289 if (new_inode) {
1290 new_inode->i_nlink--;
1291 } else {
1292 inc_nlink(new_dir);
1293 mark_inode_dirty(new_dir);
1294 }
1295 }
1296 mark_inode_dirty(old_dir);
1297 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1298 if (new_inode) {
1299 mark_inode_dirty(new_inode);
1300 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1301 }
1302
1303 if (old_dir != new_dir) {
1304 /* Keep the same times on both directories.*/
1305 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1306
1307 /*
1308 * This will also pick up the i_nlink change from the
1309 * block above.
1310 */
1311 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1312 }
1313
1314 if (old_dir_nlink != old_dir->i_nlink) {
1315 if (!old_dir_bh) {
1316 mlog(ML_ERROR, "need to change nlink for old dir "
1317 "%llu from %d to %d but bh is NULL!\n",
1318 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1319 (int)old_dir_nlink, old_dir->i_nlink);
1320 } else {
1321 struct ocfs2_dinode *fe;
1322 status = ocfs2_journal_access(handle, old_dir,
1323 old_dir_bh,
1324 OCFS2_JOURNAL_ACCESS_WRITE);
1325 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1326 fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1327 status = ocfs2_journal_dirty(handle, old_dir_bh);
1328 }
1329 }
1330
1331 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1332 status = 0;
1333 bail:
1334 if (rename_lock)
1335 ocfs2_rename_unlock(osb);
1336
1337 if (handle)
1338 ocfs2_commit_trans(osb, handle);
1339
1340 if (parents_locked)
1341 ocfs2_double_unlock(old_dir, new_dir);
1342
1343 if (old_child_locked)
1344 ocfs2_inode_unlock(old_inode, 1);
1345
1346 if (new_child_locked)
1347 ocfs2_inode_unlock(new_inode, 1);
1348
1349 if (orphan_dir) {
1350 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1351 ocfs2_inode_unlock(orphan_dir, 1);
1352 mutex_unlock(&orphan_dir->i_mutex);
1353 iput(orphan_dir);
1354 }
1355
1356 if (new_inode)
1357 sync_mapping_buffers(old_inode->i_mapping);
1358
1359 if (new_inode)
1360 iput(new_inode);
1361 brelse(newfe_bh);
1362 brelse(old_inode_bh);
1363 brelse(old_dir_bh);
1364 brelse(new_dir_bh);
1365 brelse(new_de_bh);
1366 brelse(old_de_bh);
1367 brelse(old_inode_de_bh);
1368 brelse(orphan_entry_bh);
1369 brelse(insert_entry_bh);
1370
1371 mlog_exit(status);
1372
1373 return status;
1374 }
1375
1376 /*
1377 * we expect i_size = strlen(symname). Copy symname into the file
1378 * data, including the null terminator.
1379 */
1380 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1381 handle_t *handle,
1382 struct inode *inode,
1383 const char *symname)
1384 {
1385 struct buffer_head **bhs = NULL;
1386 const char *c;
1387 struct super_block *sb = osb->sb;
1388 u64 p_blkno, p_blocks;
1389 int virtual, blocks, status, i, bytes_left;
1390
1391 bytes_left = i_size_read(inode) + 1;
1392 /* we can't trust i_blocks because we're actually going to
1393 * write i_size + 1 bytes. */
1394 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1395
1396 mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1397 (unsigned long long)inode->i_blocks,
1398 i_size_read(inode), blocks);
1399
1400 /* Sanity check -- make sure we're going to fit. */
1401 if (bytes_left >
1402 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1403 status = -EIO;
1404 mlog_errno(status);
1405 goto bail;
1406 }
1407
1408 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1409 if (!bhs) {
1410 status = -ENOMEM;
1411 mlog_errno(status);
1412 goto bail;
1413 }
1414
1415 status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1416 NULL);
1417 if (status < 0) {
1418 mlog_errno(status);
1419 goto bail;
1420 }
1421
1422 /* links can never be larger than one cluster so we know this
1423 * is all going to be contiguous, but do a sanity check
1424 * anyway. */
1425 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1426 status = -EIO;
1427 mlog_errno(status);
1428 goto bail;
1429 }
1430
1431 virtual = 0;
1432 while(bytes_left > 0) {
1433 c = &symname[virtual * sb->s_blocksize];
1434
1435 bhs[virtual] = sb_getblk(sb, p_blkno);
1436 if (!bhs[virtual]) {
1437 status = -ENOMEM;
1438 mlog_errno(status);
1439 goto bail;
1440 }
1441 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1442
1443 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1444 OCFS2_JOURNAL_ACCESS_CREATE);
1445 if (status < 0) {
1446 mlog_errno(status);
1447 goto bail;
1448 }
1449
1450 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1451
1452 memcpy(bhs[virtual]->b_data, c,
1453 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1454 bytes_left);
1455
1456 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1457 if (status < 0) {
1458 mlog_errno(status);
1459 goto bail;
1460 }
1461
1462 virtual++;
1463 p_blkno++;
1464 bytes_left -= sb->s_blocksize;
1465 }
1466
1467 status = 0;
1468 bail:
1469
1470 if (bhs) {
1471 for(i = 0; i < blocks; i++)
1472 brelse(bhs[i]);
1473 kfree(bhs);
1474 }
1475
1476 mlog_exit(status);
1477 return status;
1478 }
1479
1480 static int ocfs2_symlink(struct inode *dir,
1481 struct dentry *dentry,
1482 const char *symname)
1483 {
1484 int status, l, credits;
1485 u64 newsize;
1486 struct ocfs2_super *osb = NULL;
1487 struct inode *inode = NULL;
1488 struct super_block *sb;
1489 struct buffer_head *new_fe_bh = NULL;
1490 struct buffer_head *de_bh = NULL;
1491 struct buffer_head *parent_fe_bh = NULL;
1492 struct ocfs2_dinode *fe = NULL;
1493 struct ocfs2_dinode *dirfe;
1494 handle_t *handle = NULL;
1495 struct ocfs2_alloc_context *inode_ac = NULL;
1496 struct ocfs2_alloc_context *data_ac = NULL;
1497
1498 mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1499 dentry, symname, dentry->d_name.len, dentry->d_name.name);
1500
1501 sb = dir->i_sb;
1502 osb = OCFS2_SB(sb);
1503
1504 l = strlen(symname) + 1;
1505
1506 credits = ocfs2_calc_symlink_credits(sb);
1507
1508 /* lock the parent directory */
1509 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1510 if (status < 0) {
1511 if (status != -ENOENT)
1512 mlog_errno(status);
1513 return status;
1514 }
1515
1516 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1517 if (!dirfe->i_links_count) {
1518 /* can't make a file in a deleted directory. */
1519 status = -ENOENT;
1520 goto bail;
1521 }
1522
1523 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1524 dentry->d_name.len);
1525 if (status)
1526 goto bail;
1527
1528 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1529 dentry->d_name.name,
1530 dentry->d_name.len, &de_bh);
1531 if (status < 0) {
1532 mlog_errno(status);
1533 goto bail;
1534 }
1535
1536 status = ocfs2_reserve_new_inode(osb, &inode_ac);
1537 if (status < 0) {
1538 if (status != -ENOSPC)
1539 mlog_errno(status);
1540 goto bail;
1541 }
1542
1543 /* don't reserve bitmap space for fast symlinks. */
1544 if (l > ocfs2_fast_symlink_chars(sb)) {
1545 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
1546 if (status < 0) {
1547 if (status != -ENOSPC)
1548 mlog_errno(status);
1549 goto bail;
1550 }
1551 }
1552
1553 handle = ocfs2_start_trans(osb, credits);
1554 if (IS_ERR(handle)) {
1555 status = PTR_ERR(handle);
1556 handle = NULL;
1557 mlog_errno(status);
1558 goto bail;
1559 }
1560
1561 status = ocfs2_mknod_locked(osb, dir, dentry,
1562 S_IFLNK | S_IRWXUGO, 0,
1563 &new_fe_bh, parent_fe_bh, handle,
1564 &inode, inode_ac);
1565 if (status < 0) {
1566 mlog_errno(status);
1567 goto bail;
1568 }
1569
1570 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1571 inode->i_rdev = 0;
1572 newsize = l - 1;
1573 if (l > ocfs2_fast_symlink_chars(sb)) {
1574 u32 offset = 0;
1575
1576 inode->i_op = &ocfs2_symlink_inode_operations;
1577 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
1578 new_fe_bh,
1579 handle, data_ac, NULL,
1580 NULL);
1581 if (status < 0) {
1582 if (status != -ENOSPC && status != -EINTR) {
1583 mlog(ML_ERROR,
1584 "Failed to extend file to %llu\n",
1585 (unsigned long long)newsize);
1586 mlog_errno(status);
1587 status = -ENOSPC;
1588 }
1589 goto bail;
1590 }
1591 i_size_write(inode, newsize);
1592 inode->i_blocks = ocfs2_inode_sector_count(inode);
1593 } else {
1594 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1595 memcpy((char *) fe->id2.i_symlink, symname, l);
1596 i_size_write(inode, newsize);
1597 inode->i_blocks = 0;
1598 }
1599
1600 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1601 if (status < 0) {
1602 mlog_errno(status);
1603 goto bail;
1604 }
1605
1606 if (!ocfs2_inode_is_fast_symlink(inode)) {
1607 status = ocfs2_create_symlink_data(osb, handle, inode,
1608 symname);
1609 if (status < 0) {
1610 mlog_errno(status);
1611 goto bail;
1612 }
1613 }
1614
1615 status = ocfs2_add_entry(handle, dentry, inode,
1616 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1617 de_bh);
1618 if (status < 0) {
1619 mlog_errno(status);
1620 goto bail;
1621 }
1622
1623 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1624 if (status) {
1625 mlog_errno(status);
1626 goto bail;
1627 }
1628
1629 insert_inode_hash(inode);
1630 dentry->d_op = &ocfs2_dentry_ops;
1631 d_instantiate(dentry, inode);
1632 bail:
1633 if (handle)
1634 ocfs2_commit_trans(osb, handle);
1635
1636 ocfs2_inode_unlock(dir, 1);
1637
1638 brelse(new_fe_bh);
1639 brelse(parent_fe_bh);
1640 brelse(de_bh);
1641 if (inode_ac)
1642 ocfs2_free_alloc_context(inode_ac);
1643 if (data_ac)
1644 ocfs2_free_alloc_context(data_ac);
1645 if ((status < 0) && inode)
1646 iput(inode);
1647
1648 mlog_exit(status);
1649
1650 return status;
1651 }
1652
1653 static int ocfs2_blkno_stringify(u64 blkno, char *name)
1654 {
1655 int status, namelen;
1656
1657 mlog_entry_void();
1658
1659 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1660 (long long)blkno);
1661 if (namelen <= 0) {
1662 if (namelen)
1663 status = namelen;
1664 else
1665 status = -EINVAL;
1666 mlog_errno(status);
1667 goto bail;
1668 }
1669 if (namelen != OCFS2_ORPHAN_NAMELEN) {
1670 status = -EINVAL;
1671 mlog_errno(status);
1672 goto bail;
1673 }
1674
1675 mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
1676 namelen);
1677
1678 status = 0;
1679 bail:
1680 mlog_exit(status);
1681 return status;
1682 }
1683
1684 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
1685 struct inode **ret_orphan_dir,
1686 struct inode *inode,
1687 char *name,
1688 struct buffer_head **de_bh)
1689 {
1690 struct inode *orphan_dir_inode;
1691 struct buffer_head *orphan_dir_bh = NULL;
1692 int status = 0;
1693
1694 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1695 if (status < 0) {
1696 mlog_errno(status);
1697 return status;
1698 }
1699
1700 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
1701 ORPHAN_DIR_SYSTEM_INODE,
1702 osb->slot_num);
1703 if (!orphan_dir_inode) {
1704 status = -ENOENT;
1705 mlog_errno(status);
1706 return status;
1707 }
1708
1709 mutex_lock(&orphan_dir_inode->i_mutex);
1710
1711 status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
1712 if (status < 0) {
1713 mlog_errno(status);
1714 goto leave;
1715 }
1716
1717 status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
1718 orphan_dir_bh, name,
1719 OCFS2_ORPHAN_NAMELEN, de_bh);
1720 if (status < 0) {
1721 ocfs2_inode_unlock(orphan_dir_inode, 1);
1722
1723 mlog_errno(status);
1724 goto leave;
1725 }
1726
1727 *ret_orphan_dir = orphan_dir_inode;
1728
1729 leave:
1730 if (status) {
1731 mutex_unlock(&orphan_dir_inode->i_mutex);
1732 iput(orphan_dir_inode);
1733 }
1734
1735 brelse(orphan_dir_bh);
1736
1737 mlog_exit(status);
1738 return status;
1739 }
1740
1741 static int ocfs2_orphan_add(struct ocfs2_super *osb,
1742 handle_t *handle,
1743 struct inode *inode,
1744 struct ocfs2_dinode *fe,
1745 char *name,
1746 struct buffer_head *de_bh,
1747 struct inode *orphan_dir_inode)
1748 {
1749 struct buffer_head *orphan_dir_bh = NULL;
1750 int status = 0;
1751 struct ocfs2_dinode *orphan_fe;
1752
1753 mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
1754
1755 status = ocfs2_read_block(orphan_dir_inode,
1756 OCFS2_I(orphan_dir_inode)->ip_blkno,
1757 &orphan_dir_bh);
1758 if (status < 0) {
1759 mlog_errno(status);
1760 goto leave;
1761 }
1762
1763 status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
1764 OCFS2_JOURNAL_ACCESS_WRITE);
1765 if (status < 0) {
1766 mlog_errno(status);
1767 goto leave;
1768 }
1769
1770 /* we're a cluster, and nlink can change on disk from
1771 * underneath us... */
1772 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1773 if (S_ISDIR(inode->i_mode))
1774 le16_add_cpu(&orphan_fe->i_links_count, 1);
1775 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
1776
1777 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
1778 if (status < 0) {
1779 mlog_errno(status);
1780 goto leave;
1781 }
1782
1783 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
1784 OCFS2_ORPHAN_NAMELEN, inode,
1785 OCFS2_I(inode)->ip_blkno,
1786 orphan_dir_bh, de_bh);
1787 if (status < 0) {
1788 mlog_errno(status);
1789 goto leave;
1790 }
1791
1792 le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
1793
1794 /* Record which orphan dir our inode now resides
1795 * in. delete_inode will use this to determine which orphan
1796 * dir to lock. */
1797 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
1798
1799 mlog(0, "Inode %llu orphaned in slot %d\n",
1800 (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
1801
1802 leave:
1803 brelse(orphan_dir_bh);
1804
1805 mlog_exit(status);
1806 return status;
1807 }
1808
1809 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
1810 int ocfs2_orphan_del(struct ocfs2_super *osb,
1811 handle_t *handle,
1812 struct inode *orphan_dir_inode,
1813 struct inode *inode,
1814 struct buffer_head *orphan_dir_bh)
1815 {
1816 char name[OCFS2_ORPHAN_NAMELEN + 1];
1817 struct ocfs2_dinode *orphan_fe;
1818 int status = 0;
1819 struct buffer_head *target_de_bh = NULL;
1820 struct ocfs2_dir_entry *target_de = NULL;
1821
1822 mlog_entry_void();
1823
1824 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1825 if (status < 0) {
1826 mlog_errno(status);
1827 goto leave;
1828 }
1829
1830 mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
1831 name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
1832 OCFS2_ORPHAN_NAMELEN);
1833
1834 /* find it's spot in the orphan directory */
1835 target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
1836 orphan_dir_inode, &target_de);
1837 if (!target_de_bh) {
1838 status = -ENOENT;
1839 mlog_errno(status);
1840 goto leave;
1841 }
1842
1843 /* remove it from the orphan directory */
1844 status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
1845 target_de_bh);
1846 if (status < 0) {
1847 mlog_errno(status);
1848 goto leave;
1849 }
1850
1851 status = ocfs2_journal_access(handle,orphan_dir_inode, orphan_dir_bh,
1852 OCFS2_JOURNAL_ACCESS_WRITE);
1853 if (status < 0) {
1854 mlog_errno(status);
1855 goto leave;
1856 }
1857
1858 /* do the i_nlink dance! :) */
1859 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1860 if (S_ISDIR(inode->i_mode))
1861 le16_add_cpu(&orphan_fe->i_links_count, -1);
1862 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
1863
1864 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
1865 if (status < 0) {
1866 mlog_errno(status);
1867 goto leave;
1868 }
1869
1870 leave:
1871 brelse(target_de_bh);
1872
1873 mlog_exit(status);
1874 return status;
1875 }
1876
1877 const struct inode_operations ocfs2_dir_iops = {
1878 .create = ocfs2_create,
1879 .lookup = ocfs2_lookup,
1880 .link = ocfs2_link,
1881 .unlink = ocfs2_unlink,
1882 .rmdir = ocfs2_unlink,
1883 .symlink = ocfs2_symlink,
1884 .mkdir = ocfs2_mkdir,
1885 .mknod = ocfs2_mknod,
1886 .rename = ocfs2_rename,
1887 .setattr = ocfs2_setattr,
1888 .getattr = ocfs2_getattr,
1889 .permission = ocfs2_permission,
1890 .setxattr = generic_setxattr,
1891 .getxattr = generic_getxattr,
1892 .listxattr = ocfs2_listxattr,
1893 .removexattr = generic_removexattr,
1894 };
Support for the Chinese Samsung S3C2440 based development boards