Merge branch 'core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip...
[linux-2.6] / 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 "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 (!inode) {
382                 status = -ENOMEM;
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                         clear_nlink(inode);
496                         iput(inode);
497                 }
498         }
499
500         mlog_exit(status);
501         return status;
502 }
503
504 static int ocfs2_mkdir(struct inode *dir,
505                        struct dentry *dentry,
506                        int mode)
507 {
508         int ret;
509
510         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
511                    dentry->d_name.len, dentry->d_name.name);
512         ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
513         mlog_exit(ret);
514
515         return ret;
516 }
517
518 static int ocfs2_create(struct inode *dir,
519                         struct dentry *dentry,
520                         int mode,
521                         struct nameidata *nd)
522 {
523         int ret;
524
525         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
526                    dentry->d_name.len, dentry->d_name.name);
527         ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
528         mlog_exit(ret);
529
530         return ret;
531 }
532
533 static int ocfs2_link(struct dentry *old_dentry,
534                       struct inode *dir,
535                       struct dentry *dentry)
536 {
537         handle_t *handle;
538         struct inode *inode = old_dentry->d_inode;
539         int err;
540         struct buffer_head *fe_bh = NULL;
541         struct buffer_head *parent_fe_bh = NULL;
542         struct buffer_head *de_bh = NULL;
543         struct ocfs2_dinode *fe = NULL;
544         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
545
546         mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
547                    old_dentry->d_name.len, old_dentry->d_name.name,
548                    dentry->d_name.len, dentry->d_name.name);
549
550         if (S_ISDIR(inode->i_mode))
551                 return -EPERM;
552
553         err = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
554         if (err < 0) {
555                 if (err != -ENOENT)
556                         mlog_errno(err);
557                 return err;
558         }
559
560         if (!dir->i_nlink) {
561                 err = -ENOENT;
562                 goto out;
563         }
564
565         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
566                                         dentry->d_name.len);
567         if (err)
568                 goto out;
569
570         err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
571                                            dentry->d_name.name,
572                                            dentry->d_name.len, &de_bh);
573         if (err < 0) {
574                 mlog_errno(err);
575                 goto out;
576         }
577
578         err = ocfs2_inode_lock(inode, &fe_bh, 1);
579         if (err < 0) {
580                 if (err != -ENOENT)
581                         mlog_errno(err);
582                 goto out;
583         }
584
585         fe = (struct ocfs2_dinode *) fe_bh->b_data;
586         if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
587                 err = -EMLINK;
588                 goto out_unlock_inode;
589         }
590
591         handle = ocfs2_start_trans(osb, OCFS2_LINK_CREDITS);
592         if (IS_ERR(handle)) {
593                 err = PTR_ERR(handle);
594                 handle = NULL;
595                 mlog_errno(err);
596                 goto out_unlock_inode;
597         }
598
599         err = ocfs2_journal_access(handle, inode, fe_bh,
600                                    OCFS2_JOURNAL_ACCESS_WRITE);
601         if (err < 0) {
602                 mlog_errno(err);
603                 goto out_commit;
604         }
605
606         inc_nlink(inode);
607         inode->i_ctime = CURRENT_TIME;
608         fe->i_links_count = cpu_to_le16(inode->i_nlink);
609         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
610         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
611
612         err = ocfs2_journal_dirty(handle, fe_bh);
613         if (err < 0) {
614                 le16_add_cpu(&fe->i_links_count, -1);
615                 drop_nlink(inode);
616                 mlog_errno(err);
617                 goto out_commit;
618         }
619
620         err = ocfs2_add_entry(handle, dentry, inode,
621                               OCFS2_I(inode)->ip_blkno,
622                               parent_fe_bh, de_bh);
623         if (err) {
624                 le16_add_cpu(&fe->i_links_count, -1);
625                 drop_nlink(inode);
626                 mlog_errno(err);
627                 goto out_commit;
628         }
629
630         err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
631         if (err) {
632                 mlog_errno(err);
633                 goto out_commit;
634         }
635
636         atomic_inc(&inode->i_count);
637         dentry->d_op = &ocfs2_dentry_ops;
638         d_instantiate(dentry, inode);
639
640 out_commit:
641         ocfs2_commit_trans(osb, handle);
642 out_unlock_inode:
643         ocfs2_inode_unlock(inode, 1);
644
645 out:
646         ocfs2_inode_unlock(dir, 1);
647
648         brelse(de_bh);
649         brelse(fe_bh);
650         brelse(parent_fe_bh);
651
652         mlog_exit(err);
653
654         return err;
655 }
656
657 /*
658  * Takes and drops an exclusive lock on the given dentry. This will
659  * force other nodes to drop it.
660  */
661 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
662 {
663         int ret;
664
665         ret = ocfs2_dentry_lock(dentry, 1);
666         if (ret)
667                 mlog_errno(ret);
668         else
669                 ocfs2_dentry_unlock(dentry, 1);
670
671         return ret;
672 }
673
674 static inline int inode_is_unlinkable(struct inode *inode)
675 {
676         if (S_ISDIR(inode->i_mode)) {
677                 if (inode->i_nlink == 2)
678                         return 1;
679                 return 0;
680         }
681
682         if (inode->i_nlink == 1)
683                 return 1;
684         return 0;
685 }
686
687 static int ocfs2_unlink(struct inode *dir,
688                         struct dentry *dentry)
689 {
690         int status;
691         int child_locked = 0;
692         struct inode *inode = dentry->d_inode;
693         struct inode *orphan_dir = NULL;
694         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
695         u64 blkno;
696         struct ocfs2_dinode *fe = NULL;
697         struct buffer_head *fe_bh = NULL;
698         struct buffer_head *parent_node_bh = NULL;
699         handle_t *handle = NULL;
700         struct ocfs2_dir_entry *dirent = NULL;
701         struct buffer_head *dirent_bh = NULL;
702         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
703         struct buffer_head *orphan_entry_bh = NULL;
704
705         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
706                    dentry->d_name.len, dentry->d_name.name);
707
708         BUG_ON(dentry->d_parent->d_inode != dir);
709
710         mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
711
712         if (inode == osb->root_inode) {
713                 mlog(0, "Cannot delete the root directory\n");
714                 return -EPERM;
715         }
716
717         status = ocfs2_inode_lock(dir, &parent_node_bh, 1);
718         if (status < 0) {
719                 if (status != -ENOENT)
720                         mlog_errno(status);
721                 return status;
722         }
723
724         status = ocfs2_find_files_on_disk(dentry->d_name.name,
725                                           dentry->d_name.len, &blkno,
726                                           dir, &dirent_bh, &dirent);
727         if (status < 0) {
728                 if (status != -ENOENT)
729                         mlog_errno(status);
730                 goto leave;
731         }
732
733         if (OCFS2_I(inode)->ip_blkno != blkno) {
734                 status = -ENOENT;
735
736                 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
737                      (unsigned long long)OCFS2_I(inode)->ip_blkno,
738                      (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
739                 goto leave;
740         }
741
742         status = ocfs2_inode_lock(inode, &fe_bh, 1);
743         if (status < 0) {
744                 if (status != -ENOENT)
745                         mlog_errno(status);
746                 goto leave;
747         }
748         child_locked = 1;
749
750         if (S_ISDIR(inode->i_mode)) {
751                 if (!ocfs2_empty_dir(inode)) {
752                         status = -ENOTEMPTY;
753                         goto leave;
754                 } else if (inode->i_nlink != 2) {
755                         status = -ENOTEMPTY;
756                         goto leave;
757                 }
758         }
759
760         status = ocfs2_remote_dentry_delete(dentry);
761         if (status < 0) {
762                 /* This remote delete should succeed under all normal
763                  * circumstances. */
764                 mlog_errno(status);
765                 goto leave;
766         }
767
768         if (inode_is_unlinkable(inode)) {
769                 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
770                                                   orphan_name,
771                                                   &orphan_entry_bh);
772                 if (status < 0) {
773                         mlog_errno(status);
774                         goto leave;
775                 }
776         }
777
778         handle = ocfs2_start_trans(osb, OCFS2_UNLINK_CREDITS);
779         if (IS_ERR(handle)) {
780                 status = PTR_ERR(handle);
781                 handle = NULL;
782                 mlog_errno(status);
783                 goto leave;
784         }
785
786         status = ocfs2_journal_access(handle, inode, fe_bh,
787                                       OCFS2_JOURNAL_ACCESS_WRITE);
788         if (status < 0) {
789                 mlog_errno(status);
790                 goto leave;
791         }
792
793         fe = (struct ocfs2_dinode *) fe_bh->b_data;
794
795         if (inode_is_unlinkable(inode)) {
796                 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
797                                           orphan_entry_bh, orphan_dir);
798                 if (status < 0) {
799                         mlog_errno(status);
800                         goto leave;
801                 }
802         }
803
804         /* delete the name from the parent dir */
805         status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
806         if (status < 0) {
807                 mlog_errno(status);
808                 goto leave;
809         }
810
811         if (S_ISDIR(inode->i_mode))
812                 drop_nlink(inode);
813         drop_nlink(inode);
814         fe->i_links_count = cpu_to_le16(inode->i_nlink);
815
816         status = ocfs2_journal_dirty(handle, fe_bh);
817         if (status < 0) {
818                 mlog_errno(status);
819                 goto leave;
820         }
821
822         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
823         if (S_ISDIR(inode->i_mode))
824                 drop_nlink(dir);
825
826         status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
827         if (status < 0) {
828                 mlog_errno(status);
829                 if (S_ISDIR(inode->i_mode))
830                         inc_nlink(dir);
831         }
832
833 leave:
834         if (handle)
835                 ocfs2_commit_trans(osb, handle);
836
837         if (child_locked)
838                 ocfs2_inode_unlock(inode, 1);
839
840         ocfs2_inode_unlock(dir, 1);
841
842         if (orphan_dir) {
843                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
844                 ocfs2_inode_unlock(orphan_dir, 1);
845                 mutex_unlock(&orphan_dir->i_mutex);
846                 iput(orphan_dir);
847         }
848
849         brelse(fe_bh);
850         brelse(dirent_bh);
851         brelse(parent_node_bh);
852         brelse(orphan_entry_bh);
853
854         mlog_exit(status);
855
856         return status;
857 }
858
859 /*
860  * The only place this should be used is rename!
861  * if they have the same id, then the 1st one is the only one locked.
862  */
863 static int ocfs2_double_lock(struct ocfs2_super *osb,
864                              struct buffer_head **bh1,
865                              struct inode *inode1,
866                              struct buffer_head **bh2,
867                              struct inode *inode2)
868 {
869         int status;
870         struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
871         struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
872         struct buffer_head **tmpbh;
873         struct inode *tmpinode;
874
875         mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
876                    (unsigned long long)oi1->ip_blkno,
877                    (unsigned long long)oi2->ip_blkno);
878
879         if (*bh1)
880                 *bh1 = NULL;
881         if (*bh2)
882                 *bh2 = NULL;
883
884         /* we always want to lock the one with the lower lockid first. */
885         if (oi1->ip_blkno != oi2->ip_blkno) {
886                 if (oi1->ip_blkno < oi2->ip_blkno) {
887                         /* switch id1 and id2 around */
888                         mlog(0, "switching them around...\n");
889                         tmpbh = bh2;
890                         bh2 = bh1;
891                         bh1 = tmpbh;
892
893                         tmpinode = inode2;
894                         inode2 = inode1;
895                         inode1 = tmpinode;
896                 }
897                 /* lock id2 */
898                 status = ocfs2_inode_lock(inode2, bh2, 1);
899                 if (status < 0) {
900                         if (status != -ENOENT)
901                                 mlog_errno(status);
902                         goto bail;
903                 }
904         }
905
906         /* lock id1 */
907         status = ocfs2_inode_lock(inode1, bh1, 1);
908         if (status < 0) {
909                 /*
910                  * An error return must mean that no cluster locks
911                  * were held on function exit.
912                  */
913                 if (oi1->ip_blkno != oi2->ip_blkno)
914                         ocfs2_inode_unlock(inode2, 1);
915
916                 if (status != -ENOENT)
917                         mlog_errno(status);
918         }
919
920 bail:
921         mlog_exit(status);
922         return status;
923 }
924
925 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
926 {
927         ocfs2_inode_unlock(inode1, 1);
928
929         if (inode1 != inode2)
930                 ocfs2_inode_unlock(inode2, 1);
931 }
932
933 static int ocfs2_rename(struct inode *old_dir,
934                         struct dentry *old_dentry,
935                         struct inode *new_dir,
936                         struct dentry *new_dentry)
937 {
938         int status = 0, rename_lock = 0, parents_locked = 0;
939         int old_child_locked = 0, new_child_locked = 0;
940         struct inode *old_inode = old_dentry->d_inode;
941         struct inode *new_inode = new_dentry->d_inode;
942         struct inode *orphan_dir = NULL;
943         struct ocfs2_dinode *newfe = NULL;
944         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
945         struct buffer_head *orphan_entry_bh = NULL;
946         struct buffer_head *newfe_bh = NULL;
947         struct buffer_head *old_inode_bh = NULL;
948         struct buffer_head *insert_entry_bh = NULL;
949         struct ocfs2_super *osb = NULL;
950         u64 newfe_blkno, old_de_ino;
951         handle_t *handle = NULL;
952         struct buffer_head *old_dir_bh = NULL;
953         struct buffer_head *new_dir_bh = NULL;
954         struct ocfs2_dir_entry *old_inode_dot_dot_de = NULL, *old_de = NULL,
955                 *new_de = NULL;
956         struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
957         struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
958                                                     // this is the 1st dirent bh
959         nlink_t old_dir_nlink = old_dir->i_nlink;
960         struct ocfs2_dinode *old_di;
961
962         /* At some point it might be nice to break this function up a
963          * bit. */
964
965         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
966                    old_dir, old_dentry, new_dir, new_dentry,
967                    old_dentry->d_name.len, old_dentry->d_name.name,
968                    new_dentry->d_name.len, new_dentry->d_name.name);
969
970         osb = OCFS2_SB(old_dir->i_sb);
971
972         if (new_inode) {
973                 if (!igrab(new_inode))
974                         BUG();
975         }
976
977         /* Assume a directory hierarchy thusly:
978          * a/b/c
979          * a/d
980          * a,b,c, and d are all directories.
981          *
982          * from cwd of 'a' on both nodes:
983          * node1: mv b/c d
984          * node2: mv d   b/c
985          *
986          * And that's why, just like the VFS, we need a file system
987          * rename lock. */
988         if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
989                 status = ocfs2_rename_lock(osb);
990                 if (status < 0) {
991                         mlog_errno(status);
992                         goto bail;
993                 }
994                 rename_lock = 1;
995         }
996
997         /* if old and new are the same, this'll just do one lock. */
998         status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
999                                    &new_dir_bh, new_dir);
1000         if (status < 0) {
1001                 mlog_errno(status);
1002                 goto bail;
1003         }
1004         parents_locked = 1;
1005
1006         /* make sure both dirs have bhs
1007          * get an extra ref on old_dir_bh if old==new */
1008         if (!new_dir_bh) {
1009                 if (old_dir_bh) {
1010                         new_dir_bh = old_dir_bh;
1011                         get_bh(new_dir_bh);
1012                 } else {
1013                         mlog(ML_ERROR, "no old_dir_bh!\n");
1014                         status = -EIO;
1015                         goto bail;
1016                 }
1017         }
1018
1019         /*
1020          * Aside from allowing a meta data update, the locking here
1021          * also ensures that the downconvert thread on other nodes
1022          * won't have to concurrently downconvert the inode and the
1023          * dentry locks.
1024          */
1025         status = ocfs2_inode_lock(old_inode, &old_inode_bh, 1);
1026         if (status < 0) {
1027                 if (status != -ENOENT)
1028                         mlog_errno(status);
1029                 goto bail;
1030         }
1031         old_child_locked = 1;
1032
1033         status = ocfs2_remote_dentry_delete(old_dentry);
1034         if (status < 0) {
1035                 mlog_errno(status);
1036                 goto bail;
1037         }
1038
1039         if (S_ISDIR(old_inode->i_mode)) {
1040                 u64 old_inode_parent;
1041
1042                 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1043                                                   old_inode, &old_inode_de_bh,
1044                                                   &old_inode_dot_dot_de);
1045                 if (status) {
1046                         status = -EIO;
1047                         goto bail;
1048                 }
1049
1050                 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1051                         status = -EIO;
1052                         goto bail;
1053                 }
1054
1055                 if (!new_inode && new_dir != old_dir &&
1056                     new_dir->i_nlink >= OCFS2_LINK_MAX) {
1057                         status = -EMLINK;
1058                         goto bail;
1059                 }
1060         }
1061
1062         status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1063                                             old_dentry->d_name.len,
1064                                             &old_de_ino);
1065         if (status) {
1066                 status = -ENOENT;
1067                 goto bail;
1068         }
1069
1070         /*
1071          *  Check for inode number is _not_ due to possible IO errors.
1072          *  We might rmdir the source, keep it as pwd of some process
1073          *  and merrily kill the link to whatever was created under the
1074          *  same name. Goodbye sticky bit ;-<
1075          */
1076         if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1077                 status = -ENOENT;
1078                 goto bail;
1079         }
1080
1081         /* check if the target already exists (in which case we need
1082          * to delete it */
1083         status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1084                                           new_dentry->d_name.len,
1085                                           &newfe_blkno, new_dir, &new_de_bh,
1086                                           &new_de);
1087         /* The only error we allow here is -ENOENT because the new
1088          * file not existing is perfectly valid. */
1089         if ((status < 0) && (status != -ENOENT)) {
1090                 /* If we cannot find the file specified we should just */
1091                 /* return the error... */
1092                 mlog_errno(status);
1093                 goto bail;
1094         }
1095
1096         if (!new_de && new_inode) {
1097                 /*
1098                  * Target was unlinked by another node while we were
1099                  * waiting to get to ocfs2_rename(). There isn't
1100                  * anything we can do here to help the situation, so
1101                  * bubble up the appropriate error.
1102                  */
1103                 status = -ENOENT;
1104                 goto bail;
1105         }
1106
1107         /* In case we need to overwrite an existing file, we blow it
1108          * away first */
1109         if (new_de) {
1110                 /* VFS didn't think there existed an inode here, but
1111                  * someone else in the cluster must have raced our
1112                  * rename to create one. Today we error cleanly, in
1113                  * the future we should consider calling iget to build
1114                  * a new struct inode for this entry. */
1115                 if (!new_inode) {
1116                         status = -EACCES;
1117
1118                         mlog(0, "We found an inode for name %.*s but VFS "
1119                              "didn't give us one.\n", new_dentry->d_name.len,
1120                              new_dentry->d_name.name);
1121                         goto bail;
1122                 }
1123
1124                 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1125                         status = -EACCES;
1126
1127                         mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1128                              (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1129                              (unsigned long long)newfe_blkno,
1130                              OCFS2_I(new_inode)->ip_flags);
1131                         goto bail;
1132                 }
1133
1134                 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1135                 if (status < 0) {
1136                         if (status != -ENOENT)
1137                                 mlog_errno(status);
1138                         goto bail;
1139                 }
1140                 new_child_locked = 1;
1141
1142                 status = ocfs2_remote_dentry_delete(new_dentry);
1143                 if (status < 0) {
1144                         mlog_errno(status);
1145                         goto bail;
1146                 }
1147
1148                 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1149
1150                 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1151                      "newfebh=%p bhblocknr=%llu\n", new_de,
1152                      (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1153                      (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1154
1155                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1156                         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1157                                                           new_inode,
1158                                                           orphan_name,
1159                                                           &orphan_entry_bh);
1160                         if (status < 0) {
1161                                 mlog_errno(status);
1162                                 goto bail;
1163                         }
1164                 }
1165         } else {
1166                 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1167
1168                 status = ocfs2_check_dir_for_entry(new_dir,
1169                                                    new_dentry->d_name.name,
1170                                                    new_dentry->d_name.len);
1171                 if (status)
1172                         goto bail;
1173
1174                 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1175                                                       new_dentry->d_name.name,
1176                                                       new_dentry->d_name.len,
1177                                                       &insert_entry_bh);
1178                 if (status < 0) {
1179                         mlog_errno(status);
1180                         goto bail;
1181                 }
1182         }
1183
1184         handle = ocfs2_start_trans(osb, OCFS2_RENAME_CREDITS);
1185         if (IS_ERR(handle)) {
1186                 status = PTR_ERR(handle);
1187                 handle = NULL;
1188                 mlog_errno(status);
1189                 goto bail;
1190         }
1191
1192         if (new_de) {
1193                 if (S_ISDIR(new_inode->i_mode)) {
1194                         if (!ocfs2_empty_dir(new_inode) ||
1195                             new_inode->i_nlink != 2) {
1196                                 status = -ENOTEMPTY;
1197                                 goto bail;
1198                         }
1199                 }
1200                 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1201                                               OCFS2_JOURNAL_ACCESS_WRITE);
1202                 if (status < 0) {
1203                         mlog_errno(status);
1204                         goto bail;
1205                 }
1206
1207                 if (S_ISDIR(new_inode->i_mode) ||
1208                     (newfe->i_links_count == cpu_to_le16(1))){
1209                         status = ocfs2_orphan_add(osb, handle, new_inode,
1210                                                   newfe, orphan_name,
1211                                                   orphan_entry_bh, orphan_dir);
1212                         if (status < 0) {
1213                                 mlog_errno(status);
1214                                 goto bail;
1215                         }
1216                 }
1217
1218                 /* change the dirent to point to the correct inode */
1219                 status = ocfs2_update_entry(new_dir, handle, new_de_bh,
1220                                             new_de, old_inode);
1221                 if (status < 0) {
1222                         mlog_errno(status);
1223                         goto bail;
1224                 }
1225                 new_dir->i_version++;
1226
1227                 if (S_ISDIR(new_inode->i_mode))
1228                         newfe->i_links_count = 0;
1229                 else
1230                         le16_add_cpu(&newfe->i_links_count, -1);
1231
1232                 status = ocfs2_journal_dirty(handle, newfe_bh);
1233                 if (status < 0) {
1234                         mlog_errno(status);
1235                         goto bail;
1236                 }
1237         } else {
1238                 /* if the name was not found in new_dir, add it now */
1239                 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1240                                          OCFS2_I(old_inode)->ip_blkno,
1241                                          new_dir_bh, insert_entry_bh);
1242         }
1243
1244         old_inode->i_ctime = CURRENT_TIME;
1245         mark_inode_dirty(old_inode);
1246
1247         status = ocfs2_journal_access(handle, old_inode, old_inode_bh,
1248                                       OCFS2_JOURNAL_ACCESS_WRITE);
1249         if (status >= 0) {
1250                 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1251
1252                 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1253                 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1254
1255                 status = ocfs2_journal_dirty(handle, old_inode_bh);
1256                 if (status < 0)
1257                         mlog_errno(status);
1258         } else
1259                 mlog_errno(status);
1260
1261         /*
1262          * Now that the name has been added to new_dir, remove the old name.
1263          *
1264          * We don't keep any directory entry context around until now
1265          * because the insert might have changed the type of directory
1266          * we're dealing with.
1267          */
1268         old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1269                                      old_dentry->d_name.len,
1270                                      old_dir, &old_de);
1271         if (!old_de_bh) {
1272                 status = -EIO;
1273                 goto bail;
1274         }
1275
1276         status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1277         if (status < 0) {
1278                 mlog_errno(status);
1279                 goto bail;
1280         }
1281
1282         if (new_inode) {
1283                 new_inode->i_nlink--;
1284                 new_inode->i_ctime = CURRENT_TIME;
1285         }
1286         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1287         if (old_inode_de_bh) {
1288                 status = ocfs2_update_entry(old_inode, handle, old_inode_de_bh,
1289                                             old_inode_dot_dot_de, new_dir);
1290                 old_dir->i_nlink--;
1291                 if (new_inode) {
1292                         new_inode->i_nlink--;
1293                 } else {
1294                         inc_nlink(new_dir);
1295                         mark_inode_dirty(new_dir);
1296                 }
1297         }
1298         mark_inode_dirty(old_dir);
1299         ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1300         if (new_inode) {
1301                 mark_inode_dirty(new_inode);
1302                 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1303         }
1304
1305         if (old_dir != new_dir) {
1306                 /* Keep the same times on both directories.*/
1307                 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1308
1309                 /*
1310                  * This will also pick up the i_nlink change from the
1311                  * block above.
1312                  */
1313                 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1314         }
1315
1316         if (old_dir_nlink != old_dir->i_nlink) {
1317                 if (!old_dir_bh) {
1318                         mlog(ML_ERROR, "need to change nlink for old dir "
1319                              "%llu from %d to %d but bh is NULL!\n",
1320                              (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1321                              (int)old_dir_nlink, old_dir->i_nlink);
1322                 } else {
1323                         struct ocfs2_dinode *fe;
1324                         status = ocfs2_journal_access(handle, old_dir,
1325                                                       old_dir_bh,
1326                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1327                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1328                         fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1329                         status = ocfs2_journal_dirty(handle, old_dir_bh);
1330                 }
1331         }
1332
1333         ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1334         status = 0;
1335 bail:
1336         if (rename_lock)
1337                 ocfs2_rename_unlock(osb);
1338
1339         if (handle)
1340                 ocfs2_commit_trans(osb, handle);
1341
1342         if (parents_locked)
1343                 ocfs2_double_unlock(old_dir, new_dir);
1344
1345         if (old_child_locked)
1346                 ocfs2_inode_unlock(old_inode, 1);
1347
1348         if (new_child_locked)
1349                 ocfs2_inode_unlock(new_inode, 1);
1350
1351         if (orphan_dir) {
1352                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1353                 ocfs2_inode_unlock(orphan_dir, 1);
1354                 mutex_unlock(&orphan_dir->i_mutex);
1355                 iput(orphan_dir);
1356         }
1357
1358         if (new_inode)
1359                 sync_mapping_buffers(old_inode->i_mapping);
1360
1361         if (new_inode)
1362                 iput(new_inode);
1363         brelse(newfe_bh);
1364         brelse(old_inode_bh);
1365         brelse(old_dir_bh);
1366         brelse(new_dir_bh);
1367         brelse(new_de_bh);
1368         brelse(old_de_bh);
1369         brelse(old_inode_de_bh);
1370         brelse(orphan_entry_bh);
1371         brelse(insert_entry_bh);
1372
1373         mlog_exit(status);
1374
1375         return status;
1376 }
1377
1378 /*
1379  * we expect i_size = strlen(symname). Copy symname into the file
1380  * data, including the null terminator.
1381  */
1382 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1383                                      handle_t *handle,
1384                                      struct inode *inode,
1385                                      const char *symname)
1386 {
1387         struct buffer_head **bhs = NULL;
1388         const char *c;
1389         struct super_block *sb = osb->sb;
1390         u64 p_blkno, p_blocks;
1391         int virtual, blocks, status, i, bytes_left;
1392
1393         bytes_left = i_size_read(inode) + 1;
1394         /* we can't trust i_blocks because we're actually going to
1395          * write i_size + 1 bytes. */
1396         blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1397
1398         mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
1399                         (unsigned long long)inode->i_blocks,
1400                         i_size_read(inode), blocks);
1401
1402         /* Sanity check -- make sure we're going to fit. */
1403         if (bytes_left >
1404             ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1405                 status = -EIO;
1406                 mlog_errno(status);
1407                 goto bail;
1408         }
1409
1410         bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1411         if (!bhs) {
1412                 status = -ENOMEM;
1413                 mlog_errno(status);
1414                 goto bail;
1415         }
1416
1417         status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1418                                              NULL);
1419         if (status < 0) {
1420                 mlog_errno(status);
1421                 goto bail;
1422         }
1423
1424         /* links can never be larger than one cluster so we know this
1425          * is all going to be contiguous, but do a sanity check
1426          * anyway. */
1427         if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1428                 status = -EIO;
1429                 mlog_errno(status);
1430                 goto bail;
1431         }
1432
1433         virtual = 0;
1434         while(bytes_left > 0) {
1435                 c = &symname[virtual * sb->s_blocksize];
1436
1437                 bhs[virtual] = sb_getblk(sb, p_blkno);
1438                 if (!bhs[virtual]) {
1439                         status = -ENOMEM;
1440                         mlog_errno(status);
1441                         goto bail;
1442                 }
1443                 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1444
1445                 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1446                                               OCFS2_JOURNAL_ACCESS_CREATE);
1447                 if (status < 0) {
1448                         mlog_errno(status);
1449                         goto bail;
1450                 }
1451
1452                 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1453
1454                 memcpy(bhs[virtual]->b_data, c,
1455                        (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1456                        bytes_left);
1457
1458                 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1459                 if (status < 0) {
1460                         mlog_errno(status);
1461                         goto bail;
1462                 }
1463
1464                 virtual++;
1465                 p_blkno++;
1466                 bytes_left -= sb->s_blocksize;
1467         }
1468
1469         status = 0;
1470 bail:
1471
1472         if (bhs) {
1473                 for(i = 0; i < blocks; i++)
1474                         brelse(bhs[i]);
1475                 kfree(bhs);
1476         }
1477
1478         mlog_exit(status);
1479         return status;
1480 }
1481
1482 static int ocfs2_symlink(struct inode *dir,
1483                          struct dentry *dentry,
1484                          const char *symname)
1485 {
1486         int status, l, credits;
1487         u64 newsize;
1488         struct ocfs2_super *osb = NULL;
1489         struct inode *inode = NULL;
1490         struct super_block *sb;
1491         struct buffer_head *new_fe_bh = NULL;
1492         struct buffer_head *de_bh = NULL;
1493         struct buffer_head *parent_fe_bh = NULL;
1494         struct ocfs2_dinode *fe = NULL;
1495         struct ocfs2_dinode *dirfe;
1496         handle_t *handle = NULL;
1497         struct ocfs2_alloc_context *inode_ac = NULL;
1498         struct ocfs2_alloc_context *data_ac = NULL;
1499
1500         mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1501                    dentry, symname, dentry->d_name.len, dentry->d_name.name);
1502
1503         sb = dir->i_sb;
1504         osb = OCFS2_SB(sb);
1505
1506         l = strlen(symname) + 1;
1507
1508         credits = ocfs2_calc_symlink_credits(sb);
1509
1510         /* lock the parent directory */
1511         status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1512         if (status < 0) {
1513                 if (status != -ENOENT)
1514                         mlog_errno(status);
1515                 return status;
1516         }
1517
1518         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1519         if (!dirfe->i_links_count) {
1520                 /* can't make a file in a deleted directory. */
1521                 status = -ENOENT;
1522                 goto bail;
1523         }
1524
1525         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1526                                            dentry->d_name.len);
1527         if (status)
1528                 goto bail;
1529
1530         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1531                                               dentry->d_name.name,
1532                                               dentry->d_name.len, &de_bh);
1533         if (status < 0) {
1534                 mlog_errno(status);
1535                 goto bail;
1536         }
1537
1538         status = ocfs2_reserve_new_inode(osb, &inode_ac);
1539         if (status < 0) {
1540                 if (status != -ENOSPC)
1541                         mlog_errno(status);
1542                 goto bail;
1543         }
1544
1545         /* don't reserve bitmap space for fast symlinks. */
1546         if (l > ocfs2_fast_symlink_chars(sb)) {
1547                 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
1548                 if (status < 0) {
1549                         if (status != -ENOSPC)
1550                                 mlog_errno(status);
1551                         goto bail;
1552                 }
1553         }
1554
1555         handle = ocfs2_start_trans(osb, credits);
1556         if (IS_ERR(handle)) {
1557                 status = PTR_ERR(handle);
1558                 handle = NULL;
1559                 mlog_errno(status);
1560                 goto bail;
1561         }
1562
1563         status = ocfs2_mknod_locked(osb, dir, dentry,
1564                                     S_IFLNK | S_IRWXUGO, 0,
1565                                     &new_fe_bh, parent_fe_bh, handle,
1566                                     &inode, inode_ac);
1567         if (status < 0) {
1568                 mlog_errno(status);
1569                 goto bail;
1570         }
1571
1572         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1573         inode->i_rdev = 0;
1574         newsize = l - 1;
1575         if (l > ocfs2_fast_symlink_chars(sb)) {
1576                 u32 offset = 0;
1577
1578                 inode->i_op = &ocfs2_symlink_inode_operations;
1579                 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
1580                                               new_fe_bh,
1581                                               handle, data_ac, NULL,
1582                                               NULL);
1583                 if (status < 0) {
1584                         if (status != -ENOSPC && status != -EINTR) {
1585                                 mlog(ML_ERROR,
1586                                      "Failed to extend file to %llu\n",
1587                                      (unsigned long long)newsize);
1588                                 mlog_errno(status);
1589                                 status = -ENOSPC;
1590                         }
1591                         goto bail;
1592                 }
1593                 i_size_write(inode, newsize);
1594                 inode->i_blocks = ocfs2_inode_sector_count(inode);
1595         } else {
1596                 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1597                 memcpy((char *) fe->id2.i_symlink, symname, l);
1598                 i_size_write(inode, newsize);
1599                 inode->i_blocks = 0;
1600         }
1601
1602         status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1603         if (status < 0) {
1604                 mlog_errno(status);
1605                 goto bail;
1606         }
1607
1608         if (!ocfs2_inode_is_fast_symlink(inode)) {
1609                 status = ocfs2_create_symlink_data(osb, handle, inode,
1610                                                    symname);
1611                 if (status < 0) {
1612                         mlog_errno(status);
1613                         goto bail;
1614                 }
1615         }
1616
1617         status = ocfs2_add_entry(handle, dentry, inode,
1618                                  le64_to_cpu(fe->i_blkno), parent_fe_bh,
1619                                  de_bh);
1620         if (status < 0) {
1621                 mlog_errno(status);
1622                 goto bail;
1623         }
1624
1625         status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1626         if (status) {
1627                 mlog_errno(status);
1628                 goto bail;
1629         }
1630
1631         insert_inode_hash(inode);
1632         dentry->d_op = &ocfs2_dentry_ops;
1633         d_instantiate(dentry, inode);
1634 bail:
1635         if (handle)
1636                 ocfs2_commit_trans(osb, handle);
1637
1638         ocfs2_inode_unlock(dir, 1);
1639
1640         brelse(new_fe_bh);
1641         brelse(parent_fe_bh);
1642         brelse(de_bh);
1643         if (inode_ac)
1644                 ocfs2_free_alloc_context(inode_ac);
1645         if (data_ac)
1646                 ocfs2_free_alloc_context(data_ac);
1647         if ((status < 0) && inode)
1648                 iput(inode);
1649
1650         mlog_exit(status);
1651
1652         return status;
1653 }
1654
1655 static int ocfs2_blkno_stringify(u64 blkno, char *name)
1656 {
1657         int status, namelen;
1658
1659         mlog_entry_void();
1660
1661         namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1662                            (long long)blkno);
1663         if (namelen <= 0) {
1664                 if (namelen)
1665                         status = namelen;
1666                 else
1667                         status = -EINVAL;
1668                 mlog_errno(status);
1669                 goto bail;
1670         }
1671         if (namelen != OCFS2_ORPHAN_NAMELEN) {
1672                 status = -EINVAL;
1673                 mlog_errno(status);
1674                 goto bail;
1675         }
1676
1677         mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
1678              namelen);
1679
1680         status = 0;
1681 bail:
1682         mlog_exit(status);
1683         return status;
1684 }
1685
1686 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
1687                                     struct inode **ret_orphan_dir,
1688                                     struct inode *inode,
1689                                     char *name,
1690                                     struct buffer_head **de_bh)
1691 {
1692         struct inode *orphan_dir_inode;
1693         struct buffer_head *orphan_dir_bh = NULL;
1694         int status = 0;
1695
1696         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1697         if (status < 0) {
1698                 mlog_errno(status);
1699                 return status;
1700         }
1701
1702         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
1703                                                        ORPHAN_DIR_SYSTEM_INODE,
1704                                                        osb->slot_num);
1705         if (!orphan_dir_inode) {
1706                 status = -ENOENT;
1707                 mlog_errno(status);
1708                 return status;
1709         }
1710
1711         mutex_lock(&orphan_dir_inode->i_mutex);
1712
1713         status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
1714         if (status < 0) {
1715                 mlog_errno(status);
1716                 goto leave;
1717         }
1718
1719         status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
1720                                               orphan_dir_bh, name,
1721                                               OCFS2_ORPHAN_NAMELEN, de_bh);
1722         if (status < 0) {
1723                 ocfs2_inode_unlock(orphan_dir_inode, 1);
1724
1725                 mlog_errno(status);
1726                 goto leave;
1727         }
1728
1729         *ret_orphan_dir = orphan_dir_inode;
1730
1731 leave:
1732         if (status) {
1733                 mutex_unlock(&orphan_dir_inode->i_mutex);
1734                 iput(orphan_dir_inode);
1735         }
1736
1737         brelse(orphan_dir_bh);
1738
1739         mlog_exit(status);
1740         return status;
1741 }
1742
1743 static int ocfs2_orphan_add(struct ocfs2_super *osb,
1744                             handle_t *handle,
1745                             struct inode *inode,
1746                             struct ocfs2_dinode *fe,
1747                             char *name,
1748                             struct buffer_head *de_bh,
1749                             struct inode *orphan_dir_inode)
1750 {
1751         struct buffer_head *orphan_dir_bh = NULL;
1752         int status = 0;
1753         struct ocfs2_dinode *orphan_fe;
1754
1755         mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
1756
1757         status = ocfs2_read_block(orphan_dir_inode,
1758                                   OCFS2_I(orphan_dir_inode)->ip_blkno,
1759                                   &orphan_dir_bh);
1760         if (status < 0) {
1761                 mlog_errno(status);
1762                 goto leave;
1763         }
1764
1765         status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
1766                                       OCFS2_JOURNAL_ACCESS_WRITE);
1767         if (status < 0) {
1768                 mlog_errno(status);
1769                 goto leave;
1770         }
1771
1772         /* we're a cluster, and nlink can change on disk from
1773          * underneath us... */
1774         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1775         if (S_ISDIR(inode->i_mode))
1776                 le16_add_cpu(&orphan_fe->i_links_count, 1);
1777         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
1778
1779         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
1780         if (status < 0) {
1781                 mlog_errno(status);
1782                 goto leave;
1783         }
1784
1785         status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
1786                                    OCFS2_ORPHAN_NAMELEN, inode,
1787                                    OCFS2_I(inode)->ip_blkno,
1788                                    orphan_dir_bh, de_bh);
1789         if (status < 0) {
1790                 mlog_errno(status);
1791                 goto leave;
1792         }
1793
1794         le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
1795
1796         /* Record which orphan dir our inode now resides
1797          * in. delete_inode will use this to determine which orphan
1798          * dir to lock. */
1799         fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
1800
1801         mlog(0, "Inode %llu orphaned in slot %d\n",
1802              (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
1803
1804 leave:
1805         brelse(orphan_dir_bh);
1806
1807         mlog_exit(status);
1808         return status;
1809 }
1810
1811 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
1812 int ocfs2_orphan_del(struct ocfs2_super *osb,
1813                      handle_t *handle,
1814                      struct inode *orphan_dir_inode,
1815                      struct inode *inode,
1816                      struct buffer_head *orphan_dir_bh)
1817 {
1818         char name[OCFS2_ORPHAN_NAMELEN + 1];
1819         struct ocfs2_dinode *orphan_fe;
1820         int status = 0;
1821         struct buffer_head *target_de_bh = NULL;
1822         struct ocfs2_dir_entry *target_de = NULL;
1823
1824         mlog_entry_void();
1825
1826         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
1827         if (status < 0) {
1828                 mlog_errno(status);
1829                 goto leave;
1830         }
1831
1832         mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
1833              name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
1834              OCFS2_ORPHAN_NAMELEN);
1835
1836         /* find it's spot in the orphan directory */
1837         target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
1838                                         orphan_dir_inode, &target_de);
1839         if (!target_de_bh) {
1840                 status = -ENOENT;
1841                 mlog_errno(status);
1842                 goto leave;
1843         }
1844
1845         /* remove it from the orphan directory */
1846         status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
1847                                     target_de_bh);
1848         if (status < 0) {
1849                 mlog_errno(status);
1850                 goto leave;
1851         }
1852
1853         status = ocfs2_journal_access(handle,orphan_dir_inode,  orphan_dir_bh,
1854                                       OCFS2_JOURNAL_ACCESS_WRITE);
1855         if (status < 0) {
1856                 mlog_errno(status);
1857                 goto leave;
1858         }
1859
1860         /* do the i_nlink dance! :) */
1861         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
1862         if (S_ISDIR(inode->i_mode))
1863                 le16_add_cpu(&orphan_fe->i_links_count, -1);
1864         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
1865
1866         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
1867         if (status < 0) {
1868                 mlog_errno(status);
1869                 goto leave;
1870         }
1871
1872 leave:
1873         brelse(target_de_bh);
1874
1875         mlog_exit(status);
1876         return status;
1877 }
1878
1879 const struct inode_operations ocfs2_dir_iops = {
1880         .create         = ocfs2_create,
1881         .lookup         = ocfs2_lookup,
1882         .link           = ocfs2_link,
1883         .unlink         = ocfs2_unlink,
1884         .rmdir          = ocfs2_unlink,
1885         .symlink        = ocfs2_symlink,
1886         .mkdir          = ocfs2_mkdir,
1887         .mknod          = ocfs2_mknod,
1888         .rename         = ocfs2_rename,
1889         .setattr        = ocfs2_setattr,
1890         .getattr        = ocfs2_getattr,
1891         .permission     = ocfs2_permission,
1892         .setxattr       = generic_setxattr,
1893         .getxattr       = generic_getxattr,
1894         .listxattr      = ocfs2_listxattr,
1895         .removexattr    = generic_removexattr,
1896 };