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Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfashe...
[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 /* 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_meta_unlock(dir, 1);
327
328 if (status == -ENOSPC)
329 mlog(0, "Disk is full\n");
330
331 if (new_fe_bh)
332 brelse(new_fe_bh);
333
334 if (de_bh)
335 brelse(de_bh);
336
337 if (parent_fe_bh)
338 brelse(parent_fe_bh);
339
340 if ((status < 0) && inode)
341 iput(inode);
342
343 if (inode_ac)
344 ocfs2_free_alloc_context(inode_ac);
345
346 if (data_ac)
347 ocfs2_free_alloc_context(data_ac);
348
349 mlog_exit(status);
350
351 return status;
352 }
353
354 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
355 struct inode *dir,
356 struct dentry *dentry, int mode,
357 dev_t dev,
358 struct buffer_head **new_fe_bh,
359 struct buffer_head *parent_fe_bh,
360 handle_t *handle,
361 struct inode **ret_inode,
362 struct ocfs2_alloc_context *inode_ac)
363 {
364 int status = 0;
365 struct ocfs2_dinode *fe = NULL;
366 struct ocfs2_extent_list *fel;
367 u64 fe_blkno = 0;
368 u16 suballoc_bit;
369 struct inode *inode = NULL;
370
371 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
372 (unsigned long)dev, dentry->d_name.len,
373 dentry->d_name.name);
374
375 *new_fe_bh = NULL;
376 *ret_inode = NULL;
377
378 status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
379 &fe_blkno);
380 if (status < 0) {
381 mlog_errno(status);
382 goto leave;
383 }
384
385 inode = new_inode(dir->i_sb);
386 if (IS_ERR(inode)) {
387 status = PTR_ERR(inode);
388 mlog(ML_ERROR, "new_inode failed!\n");
389 goto leave;
390 }
391
392 /* populate as many fields early on as possible - many of
393 * these are used by the support functions here and in
394 * callers. */
395 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
396 OCFS2_I(inode)->ip_blkno = fe_blkno;
397 if (S_ISDIR(mode))
398 inode->i_nlink = 2;
399 else
400 inode->i_nlink = 1;
401 inode->i_mode = mode;
402 spin_lock(&osb->osb_lock);
403 inode->i_generation = osb->s_next_generation++;
404 spin_unlock(&osb->osb_lock);
405
406 *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
407 if (!*new_fe_bh) {
408 status = -EIO;
409 mlog_errno(status);
410 goto leave;
411 }
412 ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
413
414 status = ocfs2_journal_access(handle, inode, *new_fe_bh,
415 OCFS2_JOURNAL_ACCESS_CREATE);
416 if (status < 0) {
417 mlog_errno(status);
418 goto leave;
419 }
420
421 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
422 memset(fe, 0, osb->sb->s_blocksize);
423
424 fe->i_generation = cpu_to_le32(inode->i_generation);
425 fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
426 fe->i_blkno = cpu_to_le64(fe_blkno);
427 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
428 fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
429 fe->i_uid = cpu_to_le32(current->fsuid);
430 if (dir->i_mode & S_ISGID) {
431 fe->i_gid = cpu_to_le32(dir->i_gid);
432 if (S_ISDIR(mode))
433 mode |= S_ISGID;
434 } else
435 fe->i_gid = cpu_to_le32(current->fsgid);
436 fe->i_mode = cpu_to_le16(mode);
437 if (S_ISCHR(mode) || S_ISBLK(mode))
438 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
439
440 fe->i_links_count = cpu_to_le16(inode->i_nlink);
441
442 fe->i_last_eb_blk = 0;
443 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
444 le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
445 fe->i_atime = fe->i_ctime = fe->i_mtime =
446 cpu_to_le64(CURRENT_TIME.tv_sec);
447 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
448 cpu_to_le32(CURRENT_TIME.tv_nsec);
449 fe->i_dtime = 0;
450
451 /*
452 * If supported, directories start with inline data.
453 */
454 if (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) {
455 u16 feat = le16_to_cpu(fe->i_dyn_features);
456
457 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
458
459 fe->id2.i_data.id_count = cpu_to_le16(ocfs2_max_inline_data(osb->sb));
460 } else {
461 fel = &fe->id2.i_list;
462 fel->l_tree_depth = 0;
463 fel->l_next_free_rec = 0;
464 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
465 }
466
467 status = ocfs2_journal_dirty(handle, *new_fe_bh);
468 if (status < 0) {
469 mlog_errno(status);
470 goto leave;
471 }
472
473 if (ocfs2_populate_inode(inode, fe, 1) < 0) {
474 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
475 "i_blkno=%llu, i_ino=%lu\n",
476 (unsigned long long)(*new_fe_bh)->b_blocknr,
477 (unsigned long long)le64_to_cpu(fe->i_blkno),
478 inode->i_ino);
479 BUG();
480 }
481
482 ocfs2_inode_set_new(osb, inode);
483 if (!ocfs2_mount_local(osb)) {
484 status = ocfs2_create_new_inode_locks(inode);
485 if (status < 0)
486 mlog_errno(status);
487 }
488
489 status = 0; /* error in ocfs2_create_new_inode_locks is not
490 * critical */
491
492 *ret_inode = inode;
493 leave:
494 if (status < 0) {
495 if (*new_fe_bh) {
496 brelse(*new_fe_bh);
497 *new_fe_bh = NULL;
498 }
499 if (inode)
500 iput(inode);
501 }
502
503 mlog_exit(status);
504 return status;
505 }
506
507 static int ocfs2_mkdir(struct inode *dir,
508 struct dentry *dentry,
509 int mode)
510 {
511 int ret;
512
513 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
514 dentry->d_name.len, dentry->d_name.name);
515 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
516 mlog_exit(ret);
517
518 return ret;
519 }
520
521 static int ocfs2_create(struct inode *dir,
522 struct dentry *dentry,
523 int mode,
524 struct nameidata *nd)
525 {
526 int ret;
527
528 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
529 dentry->d_name.len, dentry->d_name.name);
530 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
531 mlog_exit(ret);
532
533 return ret;
534 }
535
536 static int ocfs2_link(struct dentry *old_dentry,
537 struct inode *dir,
538 struct dentry *dentry)
539 {
540 handle_t *handle;
541 struct inode *inode = old_dentry->d_inode;
542 int err;
543 struct buffer_head *fe_bh = NULL;
544 struct buffer_head *parent_fe_bh = NULL;
545 struct buffer_head *de_bh = NULL;
546 struct ocfs2_dinode *fe = NULL;
547 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
548
549 mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
550 old_dentry->d_name.len, old_dentry->d_name.name,
551 dentry->d_name.len, dentry->d_name.name);
552
553 if (S_ISDIR(inode->i_mode))
554 return -EPERM;
555
556 err = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
557 if (err < 0) {
558 if (err != -ENOENT)
559 mlog_errno(err);
560 return err;
561 }
562
563 if (!dir->i_nlink) {
564 err = -ENOENT;
565 goto out;
566 }
567
568 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
569 dentry->d_name.len);
570 if (err)
571 goto out;
572
573 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
574 dentry->d_name.name,
575 dentry->d_name.len, &de_bh);
576 if (err < 0) {
577 mlog_errno(err);
578 goto out;
579 }
580
581 err = ocfs2_meta_lock(inode, &fe_bh, 1);
582 if (err < 0) {
583 if (err != -ENOENT)
584 mlog_errno(err);
585 goto out;
586 }
587
588 fe = (struct ocfs2_dinode *) fe_bh->b_data;
589 if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
590 err = -EMLINK;
591 goto out_unlock_inode;
592 }
593
594 handle = ocfs2_start_trans(osb, OCFS2_LINK_CREDITS);
595 if (IS_ERR(handle)) {
596 err = PTR_ERR(handle);
597 handle = NULL;
598 mlog_errno(err);
599 goto out_unlock_inode;
600 }
601
602 err = ocfs2_journal_access(handle, inode, fe_bh,
603 OCFS2_JOURNAL_ACCESS_WRITE);
604 if (err < 0) {
605 mlog_errno(err);
606 goto out_commit;
607 }
608
609 inc_nlink(inode);
610 inode->i_ctime = CURRENT_TIME;
611 fe->i_links_count = cpu_to_le16(inode->i_nlink);
612 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
613 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
614
615 err = ocfs2_journal_dirty(handle, fe_bh);
616 if (err < 0) {
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_add_entry(handle, dentry, inode,
624 OCFS2_I(inode)->ip_blkno,
625 parent_fe_bh, de_bh);
626 if (err) {
627 le16_add_cpu(&fe->i_links_count, -1);
628 drop_nlink(inode);
629 mlog_errno(err);
630 goto out_commit;
631 }
632
633 err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
634 if (err) {
635 mlog_errno(err);
636 goto out_commit;
637 }
638
639 atomic_inc(&inode->i_count);
640 dentry->d_op = &ocfs2_dentry_ops;
641 d_instantiate(dentry, inode);
642
643 out_commit:
644 ocfs2_commit_trans(osb, handle);
645 out_unlock_inode:
646 ocfs2_meta_unlock(inode, 1);
647
648 out:
649 ocfs2_meta_unlock(dir, 1);
650
651 if (de_bh)
652 brelse(de_bh);
653 if (fe_bh)
654 brelse(fe_bh);
655 if (parent_fe_bh)
656 brelse(parent_fe_bh);
657
658 mlog_exit(err);
659
660 return err;
661 }
662
663 /*
664 * Takes and drops an exclusive lock on the given dentry. This will
665 * force other nodes to drop it.
666 */
667 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
668 {
669 int ret;
670
671 ret = ocfs2_dentry_lock(dentry, 1);
672 if (ret)
673 mlog_errno(ret);
674 else
675 ocfs2_dentry_unlock(dentry, 1);
676
677 return ret;
678 }
679
680 static inline int inode_is_unlinkable(struct inode *inode)
681 {
682 if (S_ISDIR(inode->i_mode)) {
683 if (inode->i_nlink == 2)
684 return 1;
685 return 0;
686 }
687
688 if (inode->i_nlink == 1)
689 return 1;
690 return 0;
691 }
692
693 static int ocfs2_unlink(struct inode *dir,
694 struct dentry *dentry)
695 {
696 int status;
697 int child_locked = 0;
698 struct inode *inode = dentry->d_inode;
699 struct inode *orphan_dir = NULL;
700 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
701 u64 blkno;
702 struct ocfs2_dinode *fe = NULL;
703 struct buffer_head *fe_bh = NULL;
704 struct buffer_head *parent_node_bh = NULL;
705 handle_t *handle = NULL;
706 struct ocfs2_dir_entry *dirent = NULL;
707 struct buffer_head *dirent_bh = NULL;
708 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
709 struct buffer_head *orphan_entry_bh = NULL;
710
711 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
712 dentry->d_name.len, dentry->d_name.name);
713
714 BUG_ON(dentry->d_parent->d_inode != dir);
715
716 mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
717
718 if (inode == osb->root_inode) {
719 mlog(0, "Cannot delete the root directory\n");
720 return -EPERM;
721 }
722
723 status = ocfs2_meta_lock(dir, &parent_node_bh, 1);
724 if (status < 0) {
725 if (status != -ENOENT)
726 mlog_errno(status);
727 return status;
728 }
729
730 status = ocfs2_find_files_on_disk(dentry->d_name.name,
731 dentry->d_name.len, &blkno,
732 dir, &dirent_bh, &dirent);
733 if (status < 0) {
734 if (status != -ENOENT)
735 mlog_errno(status);
736 goto leave;
737 }
738
739 if (OCFS2_I(inode)->ip_blkno != blkno) {
740 status = -ENOENT;
741
742 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
743 (unsigned long long)OCFS2_I(inode)->ip_blkno,
744 (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
745 goto leave;
746 }
747
748 status = ocfs2_meta_lock(inode, &fe_bh, 1);
749 if (status < 0) {
750 if (status != -ENOENT)
751 mlog_errno(status);
752 goto leave;
753 }
754 child_locked = 1;
755
756 if (S_ISDIR(inode->i_mode)) {
757 if (!ocfs2_empty_dir(inode)) {
758 status = -ENOTEMPTY;
759 goto leave;
760 } else if (inode->i_nlink != 2) {
761 status = -ENOTEMPTY;
762 goto leave;
763 }
764 }
765
766 status = ocfs2_remote_dentry_delete(dentry);
767 if (status < 0) {
768 /* This vote should succeed under all normal
769 * circumstances. */
770 mlog_errno(status);
771 goto leave;
772 }
773
774 if (inode_is_unlinkable(inode)) {
775 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
776 orphan_name,
777 &orphan_entry_bh);
778 if (status < 0) {
779 mlog_errno(status);
780 goto leave;
781 }
782 }
783
784 handle = ocfs2_start_trans(osb, OCFS2_UNLINK_CREDITS);
785 if (IS_ERR(handle)) {
786 status = PTR_ERR(handle);
787 handle = NULL;
788 mlog_errno(status);
789 goto leave;
790 }
791
792 status = ocfs2_journal_access(handle, inode, fe_bh,
793 OCFS2_JOURNAL_ACCESS_WRITE);
794 if (status < 0) {
795 mlog_errno(status);
796 goto leave;
797 }
798
799 fe = (struct ocfs2_dinode *) fe_bh->b_data;
800
801 if (inode_is_unlinkable(inode)) {
802 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
803 orphan_entry_bh, orphan_dir);
804 if (status < 0) {
805 mlog_errno(status);
806 goto leave;
807 }
808 }
809
810 /* delete the name from the parent dir */
811 status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
812 if (status < 0) {
813 mlog_errno(status);
814 goto leave;
815 }
816
817 if (S_ISDIR(inode->i_mode))
818 drop_nlink(inode);
819 drop_nlink(inode);
820 fe->i_links_count = cpu_to_le16(inode->i_nlink);
821
822 status = ocfs2_journal_dirty(handle, fe_bh);
823 if (status < 0) {
824 mlog_errno(status);
825 goto leave;
826 }
827
828 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
829 if (S_ISDIR(inode->i_mode))
830 drop_nlink(dir);
831
832 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
833 if (status < 0) {
834 mlog_errno(status);
835 if (S_ISDIR(inode->i_mode))
836 inc_nlink(dir);
837 }
838
839 leave:
840 if (handle)
841 ocfs2_commit_trans(osb, handle);
842
843 if (child_locked)
844 ocfs2_meta_unlock(inode, 1);
845
846 ocfs2_meta_unlock(dir, 1);
847
848 if (orphan_dir) {
849 /* This was locked for us in ocfs2_prepare_orphan_dir() */
850 ocfs2_meta_unlock(orphan_dir, 1);
851 mutex_unlock(&orphan_dir->i_mutex);
852 iput(orphan_dir);
853 }
854
855 if (fe_bh)
856 brelse(fe_bh);
857
858 if (dirent_bh)
859 brelse(dirent_bh);
860
861 if (parent_node_bh)
862 brelse(parent_node_bh);
863
864 if (orphan_entry_bh)
865 brelse(orphan_entry_bh);
866
867 mlog_exit(status);
868
869 return status;
870 }
871
872 /*
873 * The only place this should be used is rename!
874 * if they have the same id, then the 1st one is the only one locked.
875 */
876 static int ocfs2_double_lock(struct ocfs2_super *osb,
877 struct buffer_head **bh1,
878 struct inode *inode1,
879 struct buffer_head **bh2,
880 struct inode *inode2)
881 {
882 int status;
883 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
884 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
885 struct buffer_head **tmpbh;
886 struct inode *tmpinode;
887
888 mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
889 (unsigned long long)oi1->ip_blkno,
890 (unsigned long long)oi2->ip_blkno);
891
892 if (*bh1)
893 *bh1 = NULL;
894 if (*bh2)
895 *bh2 = NULL;
896
897 /* we always want to lock the one with the lower lockid first. */
898 if (oi1->ip_blkno != oi2->ip_blkno) {
899 if (oi1->ip_blkno < oi2->ip_blkno) {
900 /* switch id1 and id2 around */
901 mlog(0, "switching them around...\n");
902 tmpbh = bh2;
903 bh2 = bh1;
904 bh1 = tmpbh;
905
906 tmpinode = inode2;
907 inode2 = inode1;
908 inode1 = tmpinode;
909 }
910 /* lock id2 */
911 status = ocfs2_meta_lock(inode2, bh2, 1);
912 if (status < 0) {
913 if (status != -ENOENT)
914 mlog_errno(status);
915 goto bail;
916 }
917 }
918
919 /* lock id1 */
920 status = ocfs2_meta_lock(inode1, bh1, 1);
921 if (status < 0) {
922 /*
923 * An error return must mean that no cluster locks
924 * were held on function exit.
925 */
926 if (oi1->ip_blkno != oi2->ip_blkno)
927 ocfs2_meta_unlock(inode2, 1);
928
929 if (status != -ENOENT)
930 mlog_errno(status);
931 }
932
933 bail:
934 mlog_exit(status);
935 return status;
936 }
937
938 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
939 {
940 ocfs2_meta_unlock(inode1, 1);
941
942 if (inode1 != inode2)
943 ocfs2_meta_unlock(inode2, 1);
944 }
945
946 static int ocfs2_rename(struct inode *old_dir,
947 struct dentry *old_dentry,
948 struct inode *new_dir,
949 struct dentry *new_dentry)
950 {
951 int status = 0, rename_lock = 0, parents_locked = 0;
952 int old_child_locked = 0, new_child_locked = 0;
953 struct inode *old_inode = old_dentry->d_inode;
954 struct inode *new_inode = new_dentry->d_inode;
955 struct inode *orphan_dir = NULL;
956 struct ocfs2_dinode *newfe = NULL;
957 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
958 struct buffer_head *orphan_entry_bh = NULL;
959 struct buffer_head *newfe_bh = NULL;
960 struct buffer_head *old_inode_bh = NULL;
961 struct buffer_head *insert_entry_bh = NULL;
962 struct ocfs2_super *osb = NULL;
963 u64 newfe_blkno, old_de_ino;
964 handle_t *handle = NULL;
965 struct buffer_head *old_dir_bh = NULL;
966 struct buffer_head *new_dir_bh = NULL;
967 struct ocfs2_dir_entry *old_inode_dot_dot_de = NULL, *old_de = NULL,
968 *new_de = NULL;
969 struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
970 struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
971 // this is the 1st dirent bh
972 nlink_t old_dir_nlink = old_dir->i_nlink;
973 struct ocfs2_dinode *old_di;
974
975 /* At some point it might be nice to break this function up a
976 * bit. */
977
978 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
979 old_dir, old_dentry, new_dir, new_dentry,
980 old_dentry->d_name.len, old_dentry->d_name.name,
981 new_dentry->d_name.len, new_dentry->d_name.name);
982
983 osb = OCFS2_SB(old_dir->i_sb);
984
985 if (new_inode) {
986 if (!igrab(new_inode))
987 BUG();
988 }
989
990 /* Assume a directory hierarchy thusly:
991 * a/b/c
992 * a/d
993 * a,b,c, and d are all directories.
994 *
995 * from cwd of 'a' on both nodes:
996 * node1: mv b/c d
997 * node2: mv d b/c
998 *
999 * And that's why, just like the VFS, we need a file system
1000 * rename lock. */
1001 if (old_dentry != new_dentry) {
1002 status = ocfs2_rename_lock(osb);
1003 if (status < 0) {
1004 mlog_errno(status);
1005 goto bail;
1006 }
1007 rename_lock = 1;
1008 }
1009
1010 /* if old and new are the same, this'll just do one lock. */
1011 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1012 &new_dir_bh, new_dir);
1013 if (status < 0) {
1014 mlog_errno(status);
1015 goto bail;
1016 }
1017 parents_locked = 1;
1018
1019 /* make sure both dirs have bhs
1020 * get an extra ref on old_dir_bh if old==new */
1021 if (!new_dir_bh) {
1022 if (old_dir_bh) {
1023 new_dir_bh = old_dir_bh;
1024 get_bh(new_dir_bh);
1025 } else {
1026 mlog(ML_ERROR, "no old_dir_bh!\n");
1027 status = -EIO;
1028 goto bail;
1029 }
1030 }
1031
1032 /*
1033 * Aside from allowing a meta data update, the locking here
1034 * also ensures that the vote thread on other nodes won't have
1035 * to concurrently downconvert the inode and the dentry locks.
1036 */
1037 status = ocfs2_meta_lock(old_inode, &old_inode_bh, 1);
1038 if (status < 0) {
1039 if (status != -ENOENT)
1040 mlog_errno(status);
1041 goto bail;
1042 }
1043 old_child_locked = 1;
1044
1045 status = ocfs2_remote_dentry_delete(old_dentry);
1046 if (status < 0) {
1047 mlog_errno(status);
1048 goto bail;
1049 }
1050
1051 if (S_ISDIR(old_inode->i_mode)) {
1052 u64 old_inode_parent;
1053
1054 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1055 old_inode, &old_inode_de_bh,
1056 &old_inode_dot_dot_de);
1057 if (status) {
1058 status = -EIO;
1059 goto bail;
1060 }
1061
1062 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1063 status = -EIO;
1064 goto bail;
1065 }
1066
1067 if (!new_inode && new_dir != old_dir &&
1068 new_dir->i_nlink >= OCFS2_LINK_MAX) {
1069 status = -EMLINK;
1070 goto bail;
1071 }
1072 }
1073
1074 status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1075 old_dentry->d_name.len,
1076 &old_de_ino);
1077 if (status) {
1078 status = -ENOENT;
1079 goto bail;
1080 }
1081
1082 /*
1083 * Check for inode number is _not_ due to possible IO errors.
1084 * We might rmdir the source, keep it as pwd of some process
1085 * and merrily kill the link to whatever was created under the
1086 * same name. Goodbye sticky bit ;-<
1087 */
1088 if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1089 status = -ENOENT;
1090 goto bail;
1091 }
1092
1093 /* check if the target already exists (in which case we need
1094 * to delete it */
1095 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1096 new_dentry->d_name.len,
1097 &newfe_blkno, new_dir, &new_de_bh,
1098 &new_de);
1099 /* The only error we allow here is -ENOENT because the new
1100 * file not existing is perfectly valid. */
1101 if ((status < 0) && (status != -ENOENT)) {
1102 /* If we cannot find the file specified we should just */
1103 /* return the error... */
1104 mlog_errno(status);
1105 goto bail;
1106 }
1107
1108 if (!new_de && new_inode)
1109 mlog(ML_ERROR, "inode %lu does not exist in it's parent "
1110 "directory!", new_inode->i_ino);
1111
1112 /* In case we need to overwrite an existing file, we blow it
1113 * away first */
1114 if (new_de) {
1115 /* VFS didn't think there existed an inode here, but
1116 * someone else in the cluster must have raced our
1117 * rename to create one. Today we error cleanly, in
1118 * the future we should consider calling iget to build
1119 * a new struct inode for this entry. */
1120 if (!new_inode) {
1121 status = -EACCES;
1122
1123 mlog(0, "We found an inode for name %.*s but VFS "
1124 "didn't give us one.\n", new_dentry->d_name.len,
1125 new_dentry->d_name.name);
1126 goto bail;
1127 }
1128
1129 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1130 status = -EACCES;
1131
1132 mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1133 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1134 (unsigned long long)newfe_blkno,
1135 OCFS2_I(new_inode)->ip_flags);
1136 goto bail;
1137 }
1138
1139 status = ocfs2_meta_lock(new_inode, &newfe_bh, 1);
1140 if (status < 0) {
1141 if (status != -ENOENT)
1142 mlog_errno(status);
1143 goto bail;
1144 }
1145 new_child_locked = 1;
1146
1147 status = ocfs2_remote_dentry_delete(new_dentry);
1148 if (status < 0) {
1149 mlog_errno(status);
1150 goto bail;
1151 }
1152
1153 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1154
1155 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1156 "newfebh=%p bhblocknr=%llu\n", new_de,
1157 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1158 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1159
1160 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1161 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1162 new_inode,
1163 orphan_name,
1164 &orphan_entry_bh);
1165 if (status < 0) {
1166 mlog_errno(status);
1167 goto bail;
1168 }
1169 }
1170 } else {
1171 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1172
1173 status = ocfs2_check_dir_for_entry(new_dir,
1174 new_dentry->d_name.name,
1175 new_dentry->d_name.len);
1176 if (status)
1177 goto bail;
1178
1179 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1180 new_dentry->d_name.name,
1181 new_dentry->d_name.len,
1182 &insert_entry_bh);
1183 if (status < 0) {
1184 mlog_errno(status);
1185 goto bail;
1186 }
1187 }
1188
1189 handle = ocfs2_start_trans(osb, OCFS2_RENAME_CREDITS);
1190 if (IS_ERR(handle)) {
1191 status = PTR_ERR(handle);
1192 handle = NULL;
1193 mlog_errno(status);
1194 goto bail;
1195 }
1196
1197 if (new_de) {
1198 if (S_ISDIR(new_inode->i_mode)) {
1199 if (!ocfs2_empty_dir(new_inode) ||
1200 new_inode->i_nlink != 2) {
1201 status = -ENOTEMPTY;
1202 goto bail;
1203 }
1204 }
1205 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1206 OCFS2_JOURNAL_ACCESS_WRITE);
1207 if (status < 0) {
1208 mlog_errno(status);
1209 goto bail;
1210 }
1211
1212 if (S_ISDIR(new_inode->i_mode) ||
1213 (newfe->i_links_count == cpu_to_le16(1))){
1214 status = ocfs2_orphan_add(osb, handle, new_inode,
1215 newfe, orphan_name,
1216 orphan_entry_bh, orphan_dir);
1217 if (status < 0) {
1218 mlog_errno(status);
1219 goto bail;
1220 }
1221 }
1222
1223 /* change the dirent to point to the correct inode */
1224 status = ocfs2_update_entry(new_dir, handle, new_de_bh,
1225 new_de, old_inode);
1226 if (status < 0) {
1227 mlog_errno(status);
1228 goto bail;
1229 }
1230 new_dir->i_version++;
1231
1232 if (S_ISDIR(new_inode->i_mode))
1233 newfe->i_links_count = 0;
1234 else
1235 le16_add_cpu(&newfe->i_links_count, -1);
1236
1237 status = ocfs2_journal_dirty(handle, newfe_bh);
1238 if (status < 0) {
1239 mlog_errno(status);
1240 goto bail;
1241 }
1242 } else {
1243 /* if the name was not found in new_dir, add it now */
1244 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1245 OCFS2_I(old_inode)->ip_blkno,
1246 new_dir_bh, insert_entry_bh);
1247 }
1248
1249 old_inode->i_ctime = CURRENT_TIME;
1250 mark_inode_dirty(old_inode);
1251
1252 status = ocfs2_journal_access(handle, old_inode, old_inode_bh,
1253 OCFS2_JOURNAL_ACCESS_WRITE);
1254 if (status >= 0) {
1255 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1256
1257 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1258 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1259
1260 status = ocfs2_journal_dirty(handle, old_inode_bh);
1261 if (status < 0)
1262 mlog_errno(status);
1263 } else
1264 mlog_errno(status);
1265
1266 /*
1267 * Now that the name has been added to new_dir, remove the old name.
1268 *
1269 * We don't keep any directory entry context around until now
1270 * because the insert might have changed the type of directory
1271 * we're dealing with.
1272 */
1273 old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1274 old_dentry->d_name.len,
1275 old_dir, &old_de);
1276 if (!old_de_bh) {
1277 status = -EIO;
1278 goto bail;
1279 }
1280
1281 status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1282 if (status < 0) {
1283 mlog_errno(status);
1284 goto bail;
1285 }
1286
1287 if (new_inode) {
1288 new_inode->i_nlink--;
1289 new_inode->i_ctime = CURRENT_TIME;
1290 }
1291 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1292 if (old_inode_de_bh) {
1293 status = ocfs2_update_entry(old_inode, handle, old_inode_de_bh,
1294 old_inode_dot_dot_de, new_dir);
1295 old_dir->i_nlink--;
1296 if (new_inode) {
1297 new_inode->i_nlink--;
1298 } else {
1299 inc_nlink(new_dir);
1300 mark_inode_dirty(new_dir);
1301 }
1302 }
1303 mark_inode_dirty(old_dir);
1304 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1305 if (new_inode) {
1306 mark_inode_dirty(new_inode);
1307 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1308 }
1309
1310 if (old_dir != new_dir) {
1311 /* Keep the same times on both directories.*/
1312 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1313
1314 /*
1315 * This will also pick up the i_nlink change from the
1316 * block above.
1317 */
1318 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1319 }
1320
1321 if (old_dir_nlink != old_dir->i_nlink) {
1322 if (!old_dir_bh) {
1323 mlog(ML_ERROR, "need to change nlink for old dir "
1324 "%llu from %d to %d but bh is NULL!\n",
1325 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1326 (int)old_dir_nlink, old_dir->i_nlink);
1327 } else {
1328 struct ocfs2_dinode *fe;
1329 status = ocfs2_journal_access(handle, old_dir,
1330 old_dir_bh,
1331 OCFS2_JOURNAL_ACCESS_WRITE);
1332 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1333 fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1334 status = ocfs2_journal_dirty(handle, old_dir_bh);
1335 }
1336 }
1337
1338 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1339 status = 0;
1340 bail:
1341 if (rename_lock)
1342 ocfs2_rename_unlock(osb);
1343
1344 if (handle)
1345 ocfs2_commit_trans(osb, handle);
1346
1347 if (parents_locked)
1348 ocfs2_double_unlock(old_dir, new_dir);
1349
1350 if (old_child_locked)
1351 ocfs2_meta_unlock(old_inode, 1);
1352
1353 if (new_child_locked)
1354 ocfs2_meta_unlock(new_inode, 1);
1355
1356 if (orphan_dir) {
1357 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1358 ocfs2_meta_unlock(orphan_dir, 1);
1359 mutex_unlock(&orphan_dir->i_mutex);
1360 iput(orphan_dir);
1361 }
1362
1363 if (new_inode)
1364 sync_mapping_buffers(old_inode->i_mapping);
1365
1366 if (new_inode)
1367 iput(new_inode);
1368 if (newfe_bh)
1369 brelse(newfe_bh);
1370 if (old_inode_bh)
1371 brelse(old_inode_bh);
1372 if (old_dir_bh)
1373 brelse(old_dir_bh);
1374 if (new_dir_bh)
1375 brelse(new_dir_bh);
1376 if (new_de_bh)
1377 brelse(new_de_bh);
1378 if (old_de_bh)
1379 brelse(old_de_bh);
1380 if (old_inode_de_bh)
1381 brelse(old_inode_de_bh);
1382 if (orphan_entry_bh)
1383 brelse(orphan_entry_bh);
1384 if (insert_entry_bh)
1385 brelse(insert_entry_bh);
1386
1387 mlog_exit(status);
1388
1389 return status;
1390 }
1391
1392 /*
1393 * we expect i_size = strlen(symname). Copy symname into the file
1394 * data, including the null terminator.
1395 */
1396 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1397 handle_t *handle,
1398 struct inode *inode,
1399 const char *symname)
1400 {
1401 struct buffer_head **bhs = NULL;
1402 const char *c;
1403 struct super_block *sb = osb->sb;
1404 u64 p_blkno, p_blocks;
1405 int virtual, blocks, status, i, bytes_left;
1406
1407 bytes_left = i_size_read(inode) + 1;
1408 /* we can't trust i_blocks because we're actually going to
1409 * write i_size + 1 bytes. */
1410 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1411
1412 mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1413 (unsigned long long)inode->i_blocks,
1414 i_size_read(inode), blocks);
1415
1416 /* Sanity check -- make sure we're going to fit. */
1417 if (bytes_left >
1418 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1419 status = -EIO;
1420 mlog_errno(status);
1421 goto bail;
1422 }
1423
1424 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1425 if (!bhs) {
1426 status = -ENOMEM;
1427 mlog_errno(status);
1428 goto bail;
1429 }
1430
1431 status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1432 NULL);
1433 if (status < 0) {
1434 mlog_errno(status);
1435 goto bail;
1436 }
1437
1438 /* links can never be larger than one cluster so we know this
1439 * is all going to be contiguous, but do a sanity check
1440 * anyway. */
1441 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1442 status = -EIO;
1443 mlog_errno(status);
1444 goto bail;
1445 }
1446
1447 virtual = 0;
1448 while(bytes_left > 0) {
1449 c = &symname[virtual * sb->s_blocksize];
1450
1451 bhs[virtual] = sb_getblk(sb, p_blkno);
1452 if (!bhs[virtual]) {
1453 status = -ENOMEM;
1454 mlog_errno(status);
1455 goto bail;
1456 }
1457 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1458
1459 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1460 OCFS2_JOURNAL_ACCESS_CREATE);
1461 if (status < 0) {
1462 mlog_errno(status);
1463 goto bail;
1464 }
1465
1466 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1467
1468 memcpy(bhs[virtual]->b_data, c,
1469 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1470 bytes_left);
1471
1472 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1473 if (status < 0) {
1474 mlog_errno(status);
1475 goto bail;
1476 }
1477
1478 virtual++;
1479 p_blkno++;
1480 bytes_left -= sb->s_blocksize;
1481 }
1482
1483 status = 0;
1484 bail:
1485
1486 if (bhs) {
1487 for(i = 0; i < blocks; i++)
1488 if (bhs[i])
1489 brelse(bhs[i]);
1490 kfree(bhs);
1491 }
1492
1493 mlog_exit(status);
1494 return status;
1495 }
1496
1497 static int ocfs2_symlink(struct inode *dir,
1498 struct dentry *dentry,
1499 const char *symname)
1500 {
1501 int status, l, credits;
1502 u64 newsize;
1503 struct ocfs2_super *osb = NULL;
1504 struct inode *inode = NULL;
1505 struct super_block *sb;
1506 struct buffer_head *new_fe_bh = NULL;
1507 struct buffer_head *de_bh = NULL;
1508 struct buffer_head *parent_fe_bh = NULL;
1509 struct ocfs2_dinode *fe = NULL;
1510 struct ocfs2_dinode *dirfe;
1511 handle_t *handle = NULL;
1512 struct ocfs2_alloc_context *inode_ac = NULL;
1513 struct ocfs2_alloc_context *data_ac = NULL;
1514
1515 mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1516 dentry, symname, dentry->d_name.len, dentry->d_name.name);
1517
1518 sb = dir->i_sb;
1519 osb = OCFS2_SB(sb);
1520
1521 l = strlen(symname) + 1;
1522
1523 credits = ocfs2_calc_symlink_credits(sb);
1524
1525 /* lock the parent directory */
1526 status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
1527 if (status < 0) {
1528 if (status != -ENOENT)
1529 mlog_errno(status);
1530 return status;
1531 }
1532
1533 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1534 if (!dirfe->i_links_count) {
1535 /* can't make a file in a deleted directory. */
1536 status = -ENOENT;
1537 goto bail;
1538 }
1539
1540 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1541 dentry->d_name.len);
1542 if (status)
1543 goto bail;
1544
1545 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1546 dentry->d_name.name,
1547 dentry->d_name.len, &de_bh);
1548 if (status < 0) {
1549 mlog_errno(status);
1550 goto bail;
1551 }
1552
1553 status = ocfs2_reserve_new_inode(osb, &inode_ac);
1554 if (status < 0) {
1555 if (status != -ENOSPC)
1556 mlog_errno(status);
1557 goto bail;
1558 }
1559
1560 /* don't reserve bitmap space for fast symlinks. */
1561 if (l > ocfs2_fast_symlink_chars(sb)) {
1562 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
1563 if (status < 0) {
1564 if (status != -ENOSPC)
1565 mlog_errno(status);
1566 goto bail;
1567 }
1568 }
1569
1570 handle = ocfs2_start_trans(osb, credits);
1571 if (IS_ERR(handle)) {
1572 status = PTR_ERR(handle);
1573 handle = NULL;
1574 mlog_errno(status);
1575 goto bail;
1576 }
1577
1578 status = ocfs2_mknod_locked(osb, dir, dentry,
1579 S_IFLNK | S_IRWXUGO, 0,
1580 &new_fe_bh, parent_fe_bh, handle,
1581 &inode, inode_ac);
1582 if (status < 0) {
1583 mlog_errno(status);
1584 goto bail;
1585 }
1586
1587 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1588 inode->i_rdev = 0;
1589 newsize = l - 1;
1590 if (l > ocfs2_fast_symlink_chars(sb)) {
1591 u32 offset = 0;
1592
1593 inode->i_op = &ocfs2_symlink_inode_operations;
1594 status = ocfs2_do_extend_allocation(osb, inode, &offset, 1, 0,
1595 new_fe_bh,
1596 handle, data_ac, NULL,
1597 NULL);
1598 if (status < 0) {
1599 if (status != -ENOSPC && status != -EINTR) {
1600 mlog(ML_ERROR,
1601 "Failed to extend file to %llu\n",
1602 (unsigned long long)newsize);
1603 mlog_errno(status);
1604 status = -ENOSPC;
1605 }
1606 goto bail;
1607 }
1608 i_size_write(inode, newsize);
1609 inode->i_blocks = ocfs2_inode_sector_count(inode);
1610 } else {
1611 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1612 memcpy((char *) fe->id2.i_symlink, symname, l);
1613 i_size_write(inode, newsize);
1614 inode->i_blocks = 0;
1615 }
1616
1617 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1618 if (status < 0) {
1619 mlog_errno(status);
1620 goto bail;
1621 }
1622
1623 if (!ocfs2_inode_is_fast_symlink(inode)) {
1624 status = ocfs2_create_symlink_data(osb, handle, inode,
1625 symname);
1626 if (status < 0) {
1627 mlog_errno(status);
1628 goto bail;
1629 }
1630 }
1631
1632 status = ocfs2_add_entry(handle, dentry, inode,
1633 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1634 de_bh);
1635 if (status < 0) {
1636 mlog_errno(status);
1637 goto bail;
1638 }
1639
1640 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1641 if (status) {
1642 mlog_errno(status);
1643 goto bail;
1644 }
1645
1646 insert_inode_hash(inode);
1647 dentry->d_op = &ocfs2_dentry_ops;
1648 d_instantiate(dentry, inode);
1649 bail:
1650 if (handle)
1651 ocfs2_commit_trans(osb, handle);
1652
1653 ocfs2_meta_unlock(dir, 1);
1654
1655 if (new_fe_bh)
1656 brelse(new_fe_bh);
1657 if (parent_fe_bh)
1658 brelse(parent_fe_bh);
1659 if (de_bh)
1660 brelse(de_bh);
1661 if (inode_ac)
1662 ocfs2_free_alloc_context(inode_ac);
1663 if (data_ac)
1664 ocfs2_free_alloc_context(data_ac);
1665 if ((status < 0) && inode)
1666 iput(inode);
1667
1668 mlog_exit(status);
1669
1670 return status;
1671 }
1672
1673 static int ocfs2_blkno_stringify(u64 blkno, char *name)
1674 {
1675 int status, namelen;
1676
1677 mlog_entry_void();
1678
1679 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1680 (long long)blkno);
1681 if (namelen <= 0) {
1682 if (namelen)
1683 status = namelen;
1684 else
1685 status = -EINVAL;
1686 mlog_errno(status);
1687 goto bail;
1688 }
1689 if (namelen != OCFS2_ORPHAN_NAMELEN) {
1690 status = -EINVAL;
1691 mlog_errno(status);
1692 goto bail;
1693 }
1694
1695 mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
1696 namelen);
1697
1698 status = 0;
1699 bail:
1700 mlog_exit(status);
1701 return status;
1702 }
1703
1704 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
1705 struct inode **ret_orphan_dir,
1706 struct inode *inode,
1707 char *name,
1708 struct buffer_head **de_bh)
1709 {
1710 struct inode *orphan_dir_inode;
1711 struct buffer_head *orphan_dir_bh = NULL;
1712 int status = 0;
1713
1714 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1715 if (status < 0) {
1716 mlog_errno(status);
1717 return status;
1718 }
1719
1720 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
1721 ORPHAN_DIR_SYSTEM_INODE,
1722 osb->slot_num);
1723 if (!orphan_dir_inode) {
1724 status = -ENOENT;
1725 mlog_errno(status);
1726 return status;
1727 }
1728
1729 mutex_lock(&orphan_dir_inode->i_mutex);
1730
1731 status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1);
1732 if (status < 0) {
1733 mlog_errno(status);
1734 goto leave;
1735 }
1736
1737 status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
1738 orphan_dir_bh, name,
1739 OCFS2_ORPHAN_NAMELEN, de_bh);
1740 if (status < 0) {
1741 ocfs2_meta_unlock(orphan_dir_inode, 1);
1742
1743 mlog_errno(status);
1744 goto leave;
1745 }
1746
1747 *ret_orphan_dir = orphan_dir_inode;
1748
1749 leave:
1750 if (status) {
1751 mutex_unlock(&orphan_dir_inode->i_mutex);
1752 iput(orphan_dir_inode);
1753 }
1754
1755 if (orphan_dir_bh)
1756 brelse(orphan_dir_bh);
1757
1758 mlog_exit(status);
1759 return status;
1760 }
1761
1762 static int ocfs2_orphan_add(struct ocfs2_super *osb,
1763 handle_t *handle,
1764 struct inode *inode,
1765 struct ocfs2_dinode *fe,
1766 char *name,
1767 struct buffer_head *de_bh,
1768 struct inode *orphan_dir_inode)
1769 {
1770 struct buffer_head *orphan_dir_bh = NULL;
1771 int status = 0;
1772 struct ocfs2_dinode *orphan_fe;
1773
1774 mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
1775
1776 status = ocfs2_read_block(osb,
1777 OCFS2_I(orphan_dir_inode)->ip_blkno,
1778 &orphan_dir_bh, OCFS2_BH_CACHED,
1779 orphan_dir_inode);
1780 if (status < 0) {
1781 mlog_errno(status);
1782 goto leave;
1783 }
1784
1785 status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
1786 OCFS2_JOURNAL_ACCESS_WRITE);
1787 if (status < 0) {
1788 mlog_errno(status);
1789 goto leave;
1790 }
1791
1792 /* we're a cluster, and nlink can change on disk from
1793 * underneath us... */
1794 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1795 if (S_ISDIR(inode->i_mode))
1796 le16_add_cpu(&orphan_fe->i_links_count, 1);
1797 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
1798
1799 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
1800 if (status < 0) {
1801 mlog_errno(status);
1802 goto leave;
1803 }
1804
1805 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
1806 OCFS2_ORPHAN_NAMELEN, inode,
1807 OCFS2_I(inode)->ip_blkno,
1808 orphan_dir_bh, de_bh);
1809 if (status < 0) {
1810 mlog_errno(status);
1811 goto leave;
1812 }
1813
1814 le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
1815
1816 /* Record which orphan dir our inode now resides
1817 * in. delete_inode will use this to determine which orphan
1818 * dir to lock. */
1819 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
1820
1821 mlog(0, "Inode %llu orphaned in slot %d\n",
1822 (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
1823
1824 leave:
1825 if (orphan_dir_bh)
1826 brelse(orphan_dir_bh);
1827
1828 mlog_exit(status);
1829 return status;
1830 }
1831
1832 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
1833 int ocfs2_orphan_del(struct ocfs2_super *osb,
1834 handle_t *handle,
1835 struct inode *orphan_dir_inode,
1836 struct inode *inode,
1837 struct buffer_head *orphan_dir_bh)
1838 {
1839 char name[OCFS2_ORPHAN_NAMELEN + 1];
1840 struct ocfs2_dinode *orphan_fe;
1841 int status = 0;
1842 struct buffer_head *target_de_bh = NULL;
1843 struct ocfs2_dir_entry *target_de = NULL;
1844
1845 mlog_entry_void();
1846
1847 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1848 if (status < 0) {
1849 mlog_errno(status);
1850 goto leave;
1851 }
1852
1853 mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
1854 name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
1855 OCFS2_ORPHAN_NAMELEN);
1856
1857 /* find it's spot in the orphan directory */
1858 target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
1859 orphan_dir_inode, &target_de);
1860 if (!target_de_bh) {
1861 status = -ENOENT;
1862 mlog_errno(status);
1863 goto leave;
1864 }
1865
1866 /* remove it from the orphan directory */
1867 status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
1868 target_de_bh);
1869 if (status < 0) {
1870 mlog_errno(status);
1871 goto leave;
1872 }
1873
1874 status = ocfs2_journal_access(handle,orphan_dir_inode, orphan_dir_bh,
1875 OCFS2_JOURNAL_ACCESS_WRITE);
1876 if (status < 0) {
1877 mlog_errno(status);
1878 goto leave;
1879 }
1880
1881 /* do the i_nlink dance! :) */
1882 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1883 if (S_ISDIR(inode->i_mode))
1884 le16_add_cpu(&orphan_fe->i_links_count, -1);
1885 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
1886
1887 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
1888 if (status < 0) {
1889 mlog_errno(status);
1890 goto leave;
1891 }
1892
1893 leave:
1894 if (target_de_bh)
1895 brelse(target_de_bh);
1896
1897 mlog_exit(status);
1898 return status;
1899 }
1900
1901 const struct inode_operations ocfs2_dir_iops = {
1902 .create = ocfs2_create,
1903 .lookup = ocfs2_lookup,
1904 .link = ocfs2_link,
1905 .unlink = ocfs2_unlink,
1906 .rmdir = ocfs2_unlink,
1907 .symlink = ocfs2_symlink,
1908 .mkdir = ocfs2_mkdir,
1909 .mknod = ocfs2_mknod,
1910 .rename = ocfs2_rename,
1911 .setattr = ocfs2_setattr,
1912 .getattr = ocfs2_getattr,
1913 .permission = ocfs2_permission,
1914 };
kernel source for telekom puls (alcatel/mediatek)