ocfs2: don't use MLF* in the file system
[linux-2.6.git] / fs / ocfs2 / namei.c
1 /* -*- mode: c; c-basic-offset: 8; -*-
2  * vim: noexpandtab sw=8 ts=8 sts=0:
3  *
4  * namei.c
5  *
6  * Create and rename file, directory, symlinks
7  *
8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
9  *
10  *  Portions of this code from linux/fs/ext3/dir.c
11  *
12  *  Copyright (C) 1992, 1993, 1994, 1995
13  *  Remy Card (card@masi.ibp.fr)
14  *  Laboratoire MASI - Institut Blaise pascal
15  *  Universite Pierre et Marie Curie (Paris VI)
16  *
17  *   from
18  *
19  *   linux/fs/minix/dir.c
20  *
21  *   Copyright (C) 1991, 1992 Linux Torvalds
22  *
23  * This program is free software; you can redistribute it and/or
24  * modify it under the terms of the GNU General Public
25  * License as published by the Free Software Foundation; either
26  * version 2 of the License, or (at your option) any later version.
27  *
28  * This program is distributed in the hope that it will be useful,
29  * but WITHOUT ANY WARRANTY; without even the implied warranty of
30  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
31  * General Public License for more details.
32  *
33  * You should have received a copy of the GNU General Public
34  * License along with this program; if not, write to the
35  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
36  * Boston, MA 021110-1307, USA.
37  */
38
39 #include <linux/fs.h>
40 #include <linux/types.h>
41 #include <linux/slab.h>
42 #include <linux/highmem.h>
43
44 #define MLOG_MASK_PREFIX ML_NAMEI
45 #include <cluster/masklog.h>
46
47 #include "ocfs2.h"
48
49 #include "alloc.h"
50 #include "dcache.h"
51 #include "dir.h"
52 #include "dlmglue.h"
53 #include "extent_map.h"
54 #include "file.h"
55 #include "inode.h"
56 #include "journal.h"
57 #include "namei.h"
58 #include "suballoc.h"
59 #include "symlink.h"
60 #include "sysfile.h"
61 #include "uptodate.h"
62 #include "vote.h"
63
64 #include "buffer_head_io.h"
65
66 #define NAMEI_RA_CHUNKS  2
67 #define NAMEI_RA_BLOCKS  4
68 #define NAMEI_RA_SIZE        (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
69 #define NAMEI_RA_INDEX(c,b)  (((c) * NAMEI_RA_BLOCKS) + (b))
70
71 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
72                                         struct inode *dir,
73                                         const char *name, int namelen,
74                                         unsigned long offset,
75                                         struct ocfs2_dir_entry **res_dir);
76
77 static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle,
78                               struct inode *dir,
79                               struct ocfs2_dir_entry *de_del,
80                               struct buffer_head *bh);
81
82 static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle,
83                              struct inode *dir,
84                              const char *name, int namelen,
85                              struct inode *inode, u64 blkno,
86                              struct buffer_head *parent_fe_bh,
87                              struct buffer_head *insert_bh);
88
89 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
90                               struct inode *dir,
91                               struct dentry *dentry, int mode,
92                               dev_t dev,
93                               struct buffer_head **new_fe_bh,
94                               struct buffer_head *parent_fe_bh,
95                               struct ocfs2_journal_handle *handle,
96                               struct inode **ret_inode,
97                               struct ocfs2_alloc_context *inode_ac);
98
99 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
100                               struct ocfs2_journal_handle *handle,
101                               struct inode *parent,
102                               struct inode *inode,
103                               struct buffer_head *fe_bh,
104                               struct ocfs2_alloc_context *data_ac);
105
106 static int ocfs2_double_lock(struct ocfs2_super *osb,
107                              struct ocfs2_journal_handle *handle,
108                              struct buffer_head **bh1,
109                              struct inode *inode1,
110                              struct buffer_head **bh2,
111                              struct inode *inode2);
112
113 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
114                                     struct ocfs2_journal_handle *handle,
115                                     struct inode *inode,
116                                     char *name,
117                                     struct buffer_head **de_bh);
118
119 static int ocfs2_orphan_add(struct ocfs2_super *osb,
120                             struct ocfs2_journal_handle *handle,
121                             struct inode *inode,
122                             struct ocfs2_dinode *fe,
123                             char *name,
124                             struct buffer_head *de_bh);
125
126 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
127                                      struct ocfs2_journal_handle *handle,
128                                      struct inode *inode,
129                                      const char *symname);
130
131 static inline int ocfs2_add_entry(struct ocfs2_journal_handle *handle,
132                                   struct dentry *dentry,
133                                   struct inode *inode, u64 blkno,
134                                   struct buffer_head *parent_fe_bh,
135                                   struct buffer_head *insert_bh)
136 {
137         return __ocfs2_add_entry(handle, dentry->d_parent->d_inode,
138                                  dentry->d_name.name, dentry->d_name.len,
139                                  inode, blkno, parent_fe_bh, insert_bh);
140 }
141
142 /* An orphan dir name is an 8 byte value, printed as a hex string */
143 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
144
145 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
146                                    struct nameidata *nd)
147 {
148         int status;
149         u64 blkno;
150         struct buffer_head *dirent_bh = NULL;
151         struct inode *inode = NULL;
152         struct dentry *ret;
153         struct ocfs2_dir_entry *dirent;
154         struct ocfs2_inode_info *oi;
155
156         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
157                    dentry->d_name.len, dentry->d_name.name);
158
159         if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
160                 ret = ERR_PTR(-ENAMETOOLONG);
161                 goto bail;
162         }
163
164         mlog(0, "find name %.*s in directory %llu\n", dentry->d_name.len,
165              dentry->d_name.name, (unsigned long long)OCFS2_I(dir)->ip_blkno);
166
167         status = ocfs2_meta_lock(dir, NULL, NULL, 0);
168         if (status < 0) {
169                 if (status != -ENOENT)
170                         mlog_errno(status);
171                 ret = ERR_PTR(status);
172                 goto bail;
173         }
174
175         status = ocfs2_find_files_on_disk(dentry->d_name.name,
176                                           dentry->d_name.len, &blkno,
177                                           dir, &dirent_bh, &dirent);
178         if (status < 0)
179                 goto bail_add;
180
181         inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno);
182         if (IS_ERR(inode)) {
183                 mlog(ML_ERROR, "Unable to create inode %llu\n",
184                      (unsigned long long)blkno);
185                 ret = ERR_PTR(-EACCES);
186                 goto bail_unlock;
187         }
188
189         oi = OCFS2_I(inode);
190         /* Clear any orphaned state... If we were able to look up the
191          * inode from a directory, it certainly can't be orphaned. We
192          * might have the bad state from a node which intended to
193          * orphan this inode but crashed before it could commit the
194          * unlink. */
195         spin_lock(&oi->ip_lock);
196         oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
197         oi->ip_orphaned_slot = OCFS2_INVALID_SLOT;
198         spin_unlock(&oi->ip_lock);
199
200 bail_add:
201
202         dentry->d_op = &ocfs2_dentry_ops;
203         ret = d_splice_alias(inode, dentry);
204
205 bail_unlock:
206         /* Don't drop the cluster lock until *after* the d_add --
207          * unlink on another node will message us to remove that
208          * dentry under this lock so otherwise we can race this with
209          * the vote thread and have a stale dentry. */
210         ocfs2_meta_unlock(dir, 0);
211
212 bail:
213         if (dirent_bh)
214                 brelse(dirent_bh);
215
216         mlog_exit_ptr(ret);
217
218         return ret;
219 }
220
221 static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
222                               struct ocfs2_journal_handle *handle,
223                               struct inode *parent,
224                               struct inode *inode,
225                               struct buffer_head *fe_bh,
226                               struct ocfs2_alloc_context *data_ac)
227 {
228         int status;
229         struct buffer_head *new_bh = NULL;
230         struct ocfs2_dir_entry *de = NULL;
231
232         mlog_entry_void();
233
234         status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
235                                      data_ac, NULL, &new_bh);
236         if (status < 0) {
237                 mlog_errno(status);
238                 goto bail;
239         }
240
241         ocfs2_set_new_buffer_uptodate(inode, new_bh);
242
243         status = ocfs2_journal_access(handle, inode, new_bh,
244                                       OCFS2_JOURNAL_ACCESS_CREATE);
245         if (status < 0) {
246                 mlog_errno(status);
247                 goto bail;
248         }
249         memset(new_bh->b_data, 0, osb->sb->s_blocksize);
250
251         de = (struct ocfs2_dir_entry *) new_bh->b_data;
252         de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
253         de->name_len = 1;
254         de->rec_len =
255                 cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
256         strcpy(de->name, ".");
257         ocfs2_set_de_type(de, S_IFDIR);
258         de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
259         de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
260         de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize -
261                                   OCFS2_DIR_REC_LEN(1));
262         de->name_len = 2;
263         strcpy(de->name, "..");
264         ocfs2_set_de_type(de, S_IFDIR);
265
266         status = ocfs2_journal_dirty(handle, new_bh);
267         if (status < 0) {
268                 mlog_errno(status);
269                 goto bail;
270         }
271
272         i_size_write(inode, inode->i_sb->s_blocksize);
273         inode->i_nlink = 2;
274         inode->i_blocks = ocfs2_align_bytes_to_sectors(inode->i_sb->s_blocksize);
275         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
276         if (status < 0) {
277                 mlog_errno(status);
278                 goto bail;
279         }
280
281         status = 0;
282 bail:
283         if (new_bh)
284                 brelse(new_bh);
285
286         mlog_exit(status);
287         return status;
288 }
289
290 static int ocfs2_mknod(struct inode *dir,
291                        struct dentry *dentry,
292                        int mode,
293                        dev_t dev)
294 {
295         int status = 0;
296         struct buffer_head *parent_fe_bh = NULL;
297         struct ocfs2_journal_handle *handle = NULL;
298         struct ocfs2_super *osb;
299         struct ocfs2_dinode *dirfe;
300         struct buffer_head *new_fe_bh = NULL;
301         struct buffer_head *de_bh = NULL;
302         struct inode *inode = NULL;
303         struct ocfs2_alloc_context *inode_ac = NULL;
304         struct ocfs2_alloc_context *data_ac = NULL;
305
306         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
307                    (unsigned long)dev, dentry->d_name.len,
308                    dentry->d_name.name);
309
310         /* get our super block */
311         osb = OCFS2_SB(dir->i_sb);
312
313         if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
314                 mlog(ML_ERROR, "inode %llu has i_nlink of %u\n",
315                      (unsigned long long)OCFS2_I(dir)->ip_blkno, dir->i_nlink);
316                 status = -EMLINK;
317                 goto leave;
318         }
319
320         handle = ocfs2_alloc_handle(osb);
321         if (handle == NULL) {
322                 status = -ENOMEM;
323                 mlog_errno(status);
324                 goto leave;
325         }
326
327         status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
328         if (status < 0) {
329                 if (status != -ENOENT)
330                         mlog_errno(status);
331                 goto leave;
332         }
333
334         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
335         if (!dirfe->i_links_count) {
336                 /* can't make a file in a deleted directory. */
337                 status = -ENOENT;
338                 goto leave;
339         }
340
341         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
342                                            dentry->d_name.len);
343         if (status)
344                 goto leave;
345
346         /* get a spot inside the dir. */
347         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
348                                               dentry->d_name.name,
349                                               dentry->d_name.len, &de_bh);
350         if (status < 0) {
351                 mlog_errno(status);
352                 goto leave;
353         }
354
355         /* reserve an inode spot */
356         status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
357         if (status < 0) {
358                 if (status != -ENOSPC)
359                         mlog_errno(status);
360                 goto leave;
361         }
362
363         /* are we making a directory? If so, reserve a cluster for his
364          * 1st extent. */
365         if (S_ISDIR(mode)) {
366                 status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
367                 if (status < 0) {
368                         if (status != -ENOSPC)
369                                 mlog_errno(status);
370                         goto leave;
371                 }
372         }
373
374         handle = ocfs2_start_trans(osb, handle, OCFS2_MKNOD_CREDITS);
375         if (IS_ERR(handle)) {
376                 status = PTR_ERR(handle);
377                 handle = NULL;
378                 mlog_errno(status);
379                 goto leave;
380         }
381
382         /* do the real work now. */
383         status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
384                                     &new_fe_bh, parent_fe_bh, handle,
385                                     &inode, inode_ac);
386         if (status < 0) {
387                 mlog_errno(status);
388                 goto leave;
389         }
390
391         if (S_ISDIR(mode)) {
392                 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
393                                             new_fe_bh, data_ac);
394                 if (status < 0) {
395                         mlog_errno(status);
396                         goto leave;
397                 }
398
399                 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
400                                               OCFS2_JOURNAL_ACCESS_WRITE);
401                 if (status < 0) {
402                         mlog_errno(status);
403                         goto leave;
404                 }
405                 le16_add_cpu(&dirfe->i_links_count, 1);
406                 status = ocfs2_journal_dirty(handle, parent_fe_bh);
407                 if (status < 0) {
408                         mlog_errno(status);
409                         goto leave;
410                 }
411                 dir->i_nlink++;
412         }
413
414         status = ocfs2_add_entry(handle, dentry, inode,
415                                  OCFS2_I(inode)->ip_blkno, parent_fe_bh,
416                                  de_bh);
417         if (status < 0) {
418                 mlog_errno(status);
419                 goto leave;
420         }
421
422         insert_inode_hash(inode);
423         dentry->d_op = &ocfs2_dentry_ops;
424         d_instantiate(dentry, inode);
425         status = 0;
426 leave:
427         if (handle)
428                 ocfs2_commit_trans(handle);
429
430         if (status == -ENOSPC)
431                 mlog(0, "Disk is full\n");
432
433         if (new_fe_bh)
434                 brelse(new_fe_bh);
435
436         if (de_bh)
437                 brelse(de_bh);
438
439         if (parent_fe_bh)
440                 brelse(parent_fe_bh);
441
442         if ((status < 0) && inode)
443                 iput(inode);
444
445         if (inode_ac)
446                 ocfs2_free_alloc_context(inode_ac);
447
448         if (data_ac)
449                 ocfs2_free_alloc_context(data_ac);
450
451         mlog_exit(status);
452
453         return status;
454 }
455
456 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
457                               struct inode *dir,
458                               struct dentry *dentry, int mode,
459                               dev_t dev,
460                               struct buffer_head **new_fe_bh,
461                               struct buffer_head *parent_fe_bh,
462                               struct ocfs2_journal_handle *handle,
463                               struct inode **ret_inode,
464                               struct ocfs2_alloc_context *inode_ac)
465 {
466         int status = 0;
467         struct ocfs2_dinode *fe = NULL;
468         struct ocfs2_extent_list *fel;
469         u64 fe_blkno = 0;
470         u16 suballoc_bit;
471         struct inode *inode = NULL;
472
473         mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
474                    (unsigned long)dev, dentry->d_name.len,
475                    dentry->d_name.name);
476
477         *new_fe_bh = NULL;
478         *ret_inode = NULL;
479
480         status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
481                                        &fe_blkno);
482         if (status < 0) {
483                 mlog_errno(status);
484                 goto leave;
485         }
486
487         inode = new_inode(dir->i_sb);
488         if (IS_ERR(inode)) {
489                 status = PTR_ERR(inode);
490                 mlog(ML_ERROR, "new_inode failed!\n");
491                 goto leave;
492         }
493
494         /* populate as many fields early on as possible - many of
495          * these are used by the support functions here and in
496          * callers. */
497         inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
498         OCFS2_I(inode)->ip_blkno = fe_blkno;
499         if (S_ISDIR(mode))
500                 inode->i_nlink = 2;
501         else
502                 inode->i_nlink = 1;
503         inode->i_mode = mode;
504         spin_lock(&osb->osb_lock);
505         inode->i_generation = osb->s_next_generation++;
506         spin_unlock(&osb->osb_lock);
507
508         *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
509         if (!*new_fe_bh) {
510                 status = -EIO;
511                 mlog_errno(status);
512                 goto leave;
513         }
514         ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
515
516         status = ocfs2_journal_access(handle, inode, *new_fe_bh,
517                                       OCFS2_JOURNAL_ACCESS_CREATE);
518         if (status < 0) {
519                 mlog_errno(status);
520                 goto leave;
521         }
522
523         fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
524         memset(fe, 0, osb->sb->s_blocksize);
525
526         fe->i_generation = cpu_to_le32(inode->i_generation);
527         fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
528         fe->i_blkno = cpu_to_le64(fe_blkno);
529         fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
530         fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
531         fe->i_uid = cpu_to_le32(current->fsuid);
532         if (dir->i_mode & S_ISGID) {
533                 fe->i_gid = cpu_to_le32(dir->i_gid);
534                 if (S_ISDIR(mode))
535                         mode |= S_ISGID;
536         } else
537                 fe->i_gid = cpu_to_le32(current->fsgid);
538         fe->i_mode = cpu_to_le16(mode);
539         if (S_ISCHR(mode) || S_ISBLK(mode))
540                 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
541
542         fe->i_links_count = cpu_to_le16(inode->i_nlink);
543
544         fe->i_last_eb_blk = 0;
545         strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
546         le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
547         fe->i_atime = fe->i_ctime = fe->i_mtime =
548                 cpu_to_le64(CURRENT_TIME.tv_sec);
549         fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
550                 cpu_to_le32(CURRENT_TIME.tv_nsec);
551         fe->i_dtime = 0;
552
553         fel = &fe->id2.i_list;
554         fel->l_tree_depth = 0;
555         fel->l_next_free_rec = 0;
556         fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
557
558         status = ocfs2_journal_dirty(handle, *new_fe_bh);
559         if (status < 0) {
560                 mlog_errno(status);
561                 goto leave;
562         }
563
564         if (ocfs2_populate_inode(inode, fe, 1) < 0) {
565                 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
566                      "i_blkno=%llu, i_ino=%lu\n",
567                      (unsigned long long) (*new_fe_bh)->b_blocknr,
568                      (unsigned long long)fe->i_blkno, inode->i_ino);
569                 BUG();
570         }
571
572         ocfs2_inode_set_new(osb, inode);
573         status = ocfs2_create_new_inode_locks(inode);
574         if (status < 0)
575                 mlog_errno(status);
576
577         status = 0; /* error in ocfs2_create_new_inode_locks is not
578                      * critical */
579
580         *ret_inode = inode;
581 leave:
582         if (status < 0) {
583                 if (*new_fe_bh) {
584                         brelse(*new_fe_bh);
585                         *new_fe_bh = NULL;
586                 }
587                 if (inode)
588                         iput(inode);
589         }
590
591         mlog_exit(status);
592         return status;
593 }
594
595 static int ocfs2_mkdir(struct inode *dir,
596                        struct dentry *dentry,
597                        int mode)
598 {
599         int ret;
600
601         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
602                    dentry->d_name.len, dentry->d_name.name);
603         ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
604         mlog_exit(ret);
605
606         return ret;
607 }
608
609 static int ocfs2_create(struct inode *dir,
610                         struct dentry *dentry,
611                         int mode,
612                         struct nameidata *nd)
613 {
614         int ret;
615
616         mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
617                    dentry->d_name.len, dentry->d_name.name);
618         ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
619         mlog_exit(ret);
620
621         return ret;
622 }
623
624 static int ocfs2_link(struct dentry *old_dentry,
625                       struct inode *dir,
626                       struct dentry *dentry)
627 {
628         struct ocfs2_journal_handle *handle = NULL;
629         struct inode *inode = old_dentry->d_inode;
630         int err;
631         struct buffer_head *fe_bh = NULL;
632         struct buffer_head *parent_fe_bh = NULL;
633         struct buffer_head *de_bh = NULL;
634         struct ocfs2_dinode *fe = NULL;
635         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
636
637         mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
638                    old_dentry->d_name.len, old_dentry->d_name.name,
639                    dentry->d_name.len, dentry->d_name.name);
640
641         if (S_ISDIR(inode->i_mode)) {
642                 err = -EPERM;
643                 goto bail;
644         }
645
646         if (inode->i_nlink >= OCFS2_LINK_MAX) {
647                 err = -EMLINK;
648                 goto bail;
649         }
650
651         handle = ocfs2_alloc_handle(osb);
652         if (handle == NULL) {
653                 err = -ENOMEM;
654                 goto bail;
655         }
656
657         err = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
658         if (err < 0) {
659                 if (err != -ENOENT)
660                         mlog_errno(err);
661                 goto bail;
662         }
663
664         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
665                                         dentry->d_name.len);
666         if (err)
667                 goto bail;
668
669         err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
670                                            dentry->d_name.name,
671                                            dentry->d_name.len, &de_bh);
672         if (err < 0) {
673                 mlog_errno(err);
674                 goto bail;
675         }
676
677         err = ocfs2_meta_lock(inode, handle, &fe_bh, 1);
678         if (err < 0) {
679                 if (err != -ENOENT)
680                         mlog_errno(err);
681                 goto bail;
682         }
683
684         fe = (struct ocfs2_dinode *) fe_bh->b_data;
685         if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
686                 err = -EMLINK;
687                 goto bail;
688         }
689
690         handle = ocfs2_start_trans(osb, handle, OCFS2_LINK_CREDITS);
691         if (IS_ERR(handle)) {
692                 err = PTR_ERR(handle);
693                 handle = NULL;
694                 mlog_errno(err);
695                 goto bail;
696         }
697
698         err = ocfs2_journal_access(handle, inode, fe_bh,
699                                    OCFS2_JOURNAL_ACCESS_WRITE);
700         if (err < 0) {
701                 mlog_errno(err);
702                 goto bail;
703         }
704
705         inode->i_nlink++;
706         inode->i_ctime = CURRENT_TIME;
707         fe->i_links_count = cpu_to_le16(inode->i_nlink);
708         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
709         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
710
711         err = ocfs2_journal_dirty(handle, fe_bh);
712         if (err < 0) {
713                 le16_add_cpu(&fe->i_links_count, -1);
714                 inode->i_nlink--;
715                 mlog_errno(err);
716                 goto bail;
717         }
718
719         err = ocfs2_add_entry(handle, dentry, inode,
720                               OCFS2_I(inode)->ip_blkno,
721                               parent_fe_bh, de_bh);
722         if (err) {
723                 le16_add_cpu(&fe->i_links_count, -1);
724                 inode->i_nlink--;
725                 mlog_errno(err);
726                 goto bail;
727         }
728
729         atomic_inc(&inode->i_count);
730         dentry->d_op = &ocfs2_dentry_ops;
731         d_instantiate(dentry, inode);
732 bail:
733         if (handle)
734                 ocfs2_commit_trans(handle);
735         if (de_bh)
736                 brelse(de_bh);
737         if (fe_bh)
738                 brelse(fe_bh);
739         if (parent_fe_bh)
740                 brelse(parent_fe_bh);
741
742         mlog_exit(err);
743
744         return err;
745 }
746
747 static int ocfs2_unlink(struct inode *dir,
748                         struct dentry *dentry)
749 {
750         int status;
751         unsigned int saved_nlink = 0;
752         struct inode *inode = dentry->d_inode;
753         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
754         u64 blkno;
755         struct ocfs2_dinode *fe = NULL;
756         struct buffer_head *fe_bh = NULL;
757         struct buffer_head *parent_node_bh = NULL;
758         struct ocfs2_journal_handle *handle = NULL;
759         struct ocfs2_dir_entry *dirent = NULL;
760         struct buffer_head *dirent_bh = NULL;
761         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
762         struct buffer_head *orphan_entry_bh = NULL;
763
764         mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
765                    dentry->d_name.len, dentry->d_name.name);
766
767         BUG_ON(dentry->d_parent->d_inode != dir);
768
769         mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
770
771         if (inode == osb->root_inode) {
772                 mlog(0, "Cannot delete the root directory\n");
773                 status = -EPERM;
774                 goto leave;
775         }
776
777         handle = ocfs2_alloc_handle(osb);
778         if (handle == NULL) {
779                 status = -ENOMEM;
780                 mlog_errno(status);
781                 goto leave;
782         }
783
784         status = ocfs2_meta_lock(dir, handle, &parent_node_bh, 1);
785         if (status < 0) {
786                 if (status != -ENOENT)
787                         mlog_errno(status);
788                 goto leave;
789         }
790
791         status = ocfs2_find_files_on_disk(dentry->d_name.name,
792                                           dentry->d_name.len, &blkno,
793                                           dir, &dirent_bh, &dirent);
794         if (status < 0) {
795                 if (status != -ENOENT)
796                         mlog_errno(status);
797                 goto leave;
798         }
799
800         if (OCFS2_I(inode)->ip_blkno != blkno) {
801                 status = -ENOENT;
802
803                 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
804                      (unsigned long long)OCFS2_I(inode)->ip_blkno,
805                      (unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
806                 goto leave;
807         }
808
809         status = ocfs2_meta_lock(inode, handle, &fe_bh, 1);
810         if (status < 0) {
811                 if (status != -ENOENT)
812                         mlog_errno(status);
813                 goto leave;
814         }
815
816         if (S_ISDIR(inode->i_mode)) {
817                 if (!ocfs2_empty_dir(inode)) {
818                         status = -ENOTEMPTY;
819                         goto leave;
820                 } else if (inode->i_nlink != 2) {
821                         status = -ENOTEMPTY;
822                         goto leave;
823                 }
824         }
825
826         /* There are still a few steps left until we can consider the
827          * unlink to have succeeded. Save off nlink here before
828          * modification so we can set it back in case we hit an issue
829          * before commit. */
830         saved_nlink = inode->i_nlink;
831         if (S_ISDIR(inode->i_mode))
832                 inode->i_nlink = 0;
833         else
834                 inode->i_nlink--;
835
836         status = ocfs2_request_unlink_vote(inode, dentry,
837                                            (unsigned int) inode->i_nlink);
838         if (status < 0) {
839                 /* This vote should succeed under all normal
840                  * circumstances. */
841                 mlog_errno(status);
842                 goto leave;
843         }
844
845         if (!inode->i_nlink) {
846                 status = ocfs2_prepare_orphan_dir(osb, handle, inode,
847                                                   orphan_name,
848                                                   &orphan_entry_bh);
849                 if (status < 0) {
850                         mlog_errno(status);
851                         goto leave;
852                 }
853         }
854
855         handle = ocfs2_start_trans(osb, handle, OCFS2_UNLINK_CREDITS);
856         if (IS_ERR(handle)) {
857                 status = PTR_ERR(handle);
858                 handle = NULL;
859                 mlog_errno(status);
860                 goto leave;
861         }
862
863         status = ocfs2_journal_access(handle, inode, fe_bh,
864                                       OCFS2_JOURNAL_ACCESS_WRITE);
865         if (status < 0) {
866                 mlog_errno(status);
867                 goto leave;
868         }
869
870         fe = (struct ocfs2_dinode *) fe_bh->b_data;
871
872         if (!inode->i_nlink) {
873                 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
874                                           orphan_entry_bh);
875                 if (status < 0) {
876                         mlog_errno(status);
877                         goto leave;
878                 }
879         }
880
881         /* delete the name from the parent dir */
882         status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
883         if (status < 0) {
884                 mlog_errno(status);
885                 goto leave;
886         }
887
888         /* We can set nlink on the dinode now. clear the saved version
889          * so that it doesn't get set later. */
890         fe->i_links_count = cpu_to_le16(inode->i_nlink);
891         saved_nlink = 0;
892
893         status = ocfs2_journal_dirty(handle, fe_bh);
894         if (status < 0) {
895                 mlog_errno(status);
896                 goto leave;
897         }
898
899         if (S_ISDIR(inode->i_mode)) {
900                 dir->i_nlink--;
901                 status = ocfs2_mark_inode_dirty(handle, dir,
902                                                 parent_node_bh);
903                 if (status < 0) {
904                         mlog_errno(status);
905                         dir->i_nlink++;
906                 }
907         }
908
909 leave:
910         if (status < 0 && saved_nlink)
911                 inode->i_nlink = saved_nlink;
912
913         if (handle)
914                 ocfs2_commit_trans(handle);
915
916         if (fe_bh)
917                 brelse(fe_bh);
918
919         if (dirent_bh)
920                 brelse(dirent_bh);
921
922         if (parent_node_bh)
923                 brelse(parent_node_bh);
924
925         if (orphan_entry_bh)
926                 brelse(orphan_entry_bh);
927
928         mlog_exit(status);
929
930         return status;
931 }
932
933 /*
934  * The only place this should be used is rename!
935  * if they have the same id, then the 1st one is the only one locked.
936  */
937 static int ocfs2_double_lock(struct ocfs2_super *osb,
938                              struct ocfs2_journal_handle *handle,
939                              struct buffer_head **bh1,
940                              struct inode *inode1,
941                              struct buffer_head **bh2,
942                              struct inode *inode2)
943 {
944         int status;
945         struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
946         struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
947         struct buffer_head **tmpbh;
948         struct inode *tmpinode;
949
950         mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
951                    (unsigned long long)oi1->ip_blkno,
952                    (unsigned long long)oi2->ip_blkno);
953
954         BUG_ON(!handle);
955
956         if (*bh1)
957                 *bh1 = NULL;
958         if (*bh2)
959                 *bh2 = NULL;
960
961         /* we always want to lock the one with the lower lockid first. */
962         if (oi1->ip_blkno != oi2->ip_blkno) {
963                 if (oi1->ip_blkno < oi2->ip_blkno) {
964                         /* switch id1 and id2 around */
965                         mlog(0, "switching them around...\n");
966                         tmpbh = bh2;
967                         bh2 = bh1;
968                         bh1 = tmpbh;
969
970                         tmpinode = inode2;
971                         inode2 = inode1;
972                         inode1 = tmpinode;
973                 }
974                 /* lock id2 */
975                 status = ocfs2_meta_lock(inode2, handle, bh2, 1);
976                 if (status < 0) {
977                         if (status != -ENOENT)
978                                 mlog_errno(status);
979                         goto bail;
980                 }
981         }
982         /* lock id1 */
983         status = ocfs2_meta_lock(inode1, handle, bh1, 1);
984         if (status < 0) {
985                 if (status != -ENOENT)
986                         mlog_errno(status);
987                 goto bail;
988         }
989 bail:
990         mlog_exit(status);
991         return status;
992 }
993
994 #define PARENT_INO(buffer) \
995         ((struct ocfs2_dir_entry *) \
996          ((char *)buffer + \
997           le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode
998
999 static int ocfs2_rename(struct inode *old_dir,
1000                         struct dentry *old_dentry,
1001                         struct inode *new_dir,
1002                         struct dentry *new_dentry)
1003 {
1004         int status = 0, rename_lock = 0;
1005         struct inode *old_inode = old_dentry->d_inode;
1006         struct inode *new_inode = new_dentry->d_inode;
1007         struct ocfs2_dinode *newfe = NULL;
1008         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1009         struct buffer_head *orphan_entry_bh = NULL;
1010         struct buffer_head *newfe_bh = NULL;
1011         struct buffer_head *insert_entry_bh = NULL;
1012         struct ocfs2_super *osb = NULL;
1013         u64 newfe_blkno;
1014         struct ocfs2_journal_handle *handle = NULL;
1015         struct buffer_head *old_dir_bh = NULL;
1016         struct buffer_head *new_dir_bh = NULL;
1017         struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry
1018                                                                // and new_dentry
1019         struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
1020         struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
1021                                                     // this is the 1st dirent bh
1022         nlink_t old_dir_nlink = old_dir->i_nlink, new_dir_nlink = new_dir->i_nlink;
1023         unsigned int links_count;
1024
1025         /* At some point it might be nice to break this function up a
1026          * bit. */
1027
1028         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
1029                    old_dir, old_dentry, new_dir, new_dentry,
1030                    old_dentry->d_name.len, old_dentry->d_name.name,
1031                    new_dentry->d_name.len, new_dentry->d_name.name);
1032
1033         osb = OCFS2_SB(old_dir->i_sb);
1034
1035         if (new_inode) {
1036                 if (!igrab(new_inode))
1037                         BUG();
1038         }
1039
1040         if (atomic_read(&old_dentry->d_count) > 2) {
1041                 shrink_dcache_parent(old_dentry);
1042                 if (atomic_read(&old_dentry->d_count) > 2) {
1043                         status = -EBUSY;
1044                         goto bail;
1045                 }
1046         }
1047
1048         /* Assume a directory heirarchy thusly:
1049          * a/b/c
1050          * a/d
1051          * a,b,c, and d are all directories.
1052          *
1053          * from cwd of 'a' on both nodes:
1054          * node1: mv b/c d
1055          * node2: mv d   b/c
1056          *
1057          * And that's why, just like the VFS, we need a file system
1058          * rename lock. */
1059         if (old_dentry != new_dentry) {
1060                 status = ocfs2_rename_lock(osb);
1061                 if (status < 0) {
1062                         mlog_errno(status);
1063                         goto bail;
1064                 }
1065                 rename_lock = 1;
1066         }
1067
1068         handle = ocfs2_alloc_handle(osb);
1069         if (handle == NULL) {
1070                 status = -ENOMEM;
1071                 mlog_errno(status);
1072                 goto bail;
1073         }
1074
1075         /* if old and new are the same, this'll just do one lock. */
1076         status = ocfs2_double_lock(osb, handle,
1077                                   &old_dir_bh, old_dir,
1078                                   &new_dir_bh, new_dir);
1079         if (status < 0) {
1080                 mlog_errno(status);
1081                 goto bail;
1082         }
1083
1084         /* make sure both dirs have bhs
1085          * get an extra ref on old_dir_bh if old==new */
1086         if (!new_dir_bh) {
1087                 if (old_dir_bh) {
1088                         new_dir_bh = old_dir_bh;
1089                         get_bh(new_dir_bh);
1090                 } else {
1091                         mlog(ML_ERROR, "no old_dir_bh!\n");
1092                         status = -EIO;
1093                         goto bail;
1094                 }
1095         }
1096
1097         if (S_ISDIR(old_inode->i_mode)) {
1098                 /* Directories actually require metadata updates to
1099                  * the directory info so we can't get away with not
1100                  * doing node locking on it. */
1101                 status = ocfs2_meta_lock(old_inode, handle, NULL, 1);
1102                 if (status < 0) {
1103                         if (status != -ENOENT)
1104                                 mlog_errno(status);
1105                         goto bail;
1106                 }
1107
1108                 status = ocfs2_request_rename_vote(old_inode, old_dentry);
1109                 if (status < 0) {
1110                         mlog_errno(status);
1111                         goto bail;
1112                 }
1113
1114                 status = -EIO;
1115                 old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0);
1116                 if (!old_inode_de_bh)
1117                         goto bail;
1118
1119                 status = -EIO;
1120                 if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) !=
1121                     OCFS2_I(old_dir)->ip_blkno)
1122                         goto bail;
1123                 status = -EMLINK;
1124                 if (!new_inode && new_dir!=old_dir &&
1125                     new_dir->i_nlink >= OCFS2_LINK_MAX)
1126                         goto bail;
1127         } else {
1128                 /* Ah, the simple case - we're a file so just send a
1129                  * message. */
1130                 status = ocfs2_request_rename_vote(old_inode, old_dentry);
1131                 if (status < 0) {
1132                         mlog_errno(status);
1133                         goto bail;
1134                 }
1135         }
1136
1137         status = -ENOENT;
1138         old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1139                                      old_dentry->d_name.len,
1140                                      old_dir, &old_de);
1141         if (!old_de_bh)
1142                 goto bail;
1143
1144         /*
1145          *  Check for inode number is _not_ due to possible IO errors.
1146          *  We might rmdir the source, keep it as pwd of some process
1147          *  and merrily kill the link to whatever was created under the
1148          *  same name. Goodbye sticky bit ;-<
1149          */
1150         if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno)
1151                 goto bail;
1152
1153         /* check if the target already exists (in which case we need
1154          * to delete it */
1155         status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1156                                           new_dentry->d_name.len,
1157                                           &newfe_blkno, new_dir, &new_de_bh,
1158                                           &new_de);
1159         /* The only error we allow here is -ENOENT because the new
1160          * file not existing is perfectly valid. */
1161         if ((status < 0) && (status != -ENOENT)) {
1162                 /* If we cannot find the file specified we should just */
1163                 /* return the error... */
1164                 mlog_errno(status);
1165                 goto bail;
1166         }
1167
1168         if (!new_de && new_inode)
1169                 mlog(ML_ERROR, "inode %lu does not exist in it's parent "
1170                      "directory!", new_inode->i_ino);
1171
1172         /* In case we need to overwrite an existing file, we blow it
1173          * away first */
1174         if (new_de) {
1175                 /* VFS didn't think there existed an inode here, but
1176                  * someone else in the cluster must have raced our
1177                  * rename to create one. Today we error cleanly, in
1178                  * the future we should consider calling iget to build
1179                  * a new struct inode for this entry. */
1180                 if (!new_inode) {
1181                         status = -EACCES;
1182
1183                         mlog(0, "We found an inode for name %.*s but VFS "
1184                              "didn't give us one.\n", new_dentry->d_name.len,
1185                              new_dentry->d_name.name);
1186                         goto bail;
1187                 }
1188
1189                 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1190                         status = -EACCES;
1191
1192                         mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
1193                              (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1194                              (unsigned long long)newfe_blkno,
1195                              OCFS2_I(new_inode)->ip_flags);
1196                         goto bail;
1197                 }
1198
1199                 status = ocfs2_meta_lock(new_inode, handle, &newfe_bh, 1);
1200                 if (status < 0) {
1201                         if (status != -ENOENT)
1202                                 mlog_errno(status);
1203                         goto bail;
1204                 }
1205
1206                 if (S_ISDIR(new_inode->i_mode))
1207                         links_count = 0;
1208                 else
1209                         links_count = (unsigned int) (new_inode->i_nlink - 1);
1210
1211                 status = ocfs2_request_unlink_vote(new_inode, new_dentry,
1212                                                    links_count);
1213                 if (status < 0) {
1214                         mlog_errno(status);
1215                         goto bail;
1216                 }
1217
1218                 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1219
1220                 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
1221                      "newfebh=%p bhblocknr=%llu\n", new_de,
1222                      (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1223                      (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1224
1225                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1226                         status = ocfs2_prepare_orphan_dir(osb, handle,
1227                                                           new_inode,
1228                                                           orphan_name,
1229                                                           &orphan_entry_bh);
1230                         if (status < 0) {
1231                                 mlog_errno(status);
1232                                 goto bail;
1233                         }
1234                 }
1235         } else {
1236                 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1237
1238                 status = ocfs2_check_dir_for_entry(new_dir,
1239                                                    new_dentry->d_name.name,
1240                                                    new_dentry->d_name.len);
1241                 if (status)
1242                         goto bail;
1243
1244                 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1245                                                       new_dentry->d_name.name,
1246                                                       new_dentry->d_name.len,
1247                                                       &insert_entry_bh);
1248                 if (status < 0) {
1249                         mlog_errno(status);
1250                         goto bail;
1251                 }
1252         }
1253
1254         handle = ocfs2_start_trans(osb, handle, OCFS2_RENAME_CREDITS);
1255         if (IS_ERR(handle)) {
1256                 status = PTR_ERR(handle);
1257                 handle = NULL;
1258                 mlog_errno(status);
1259                 goto bail;
1260         }
1261
1262         if (new_de) {
1263                 if (S_ISDIR(new_inode->i_mode)) {
1264                         if (!ocfs2_empty_dir(new_inode) ||
1265                             new_inode->i_nlink != 2) {
1266                                 status = -ENOTEMPTY;
1267                                 goto bail;
1268                         }
1269                 }
1270                 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1271                                               OCFS2_JOURNAL_ACCESS_WRITE);
1272                 if (status < 0) {
1273                         mlog_errno(status);
1274                         goto bail;
1275                 }
1276
1277                 if (S_ISDIR(new_inode->i_mode) ||
1278                     (newfe->i_links_count == cpu_to_le16(1))){
1279                         status = ocfs2_orphan_add(osb, handle, new_inode,
1280                                                   newfe, orphan_name,
1281                                                   orphan_entry_bh);
1282                         if (status < 0) {
1283                                 mlog_errno(status);
1284                                 goto bail;
1285                         }
1286                 }
1287
1288                 /* change the dirent to point to the correct inode */
1289                 status = ocfs2_journal_access(handle, new_dir, new_de_bh,
1290                                               OCFS2_JOURNAL_ACCESS_WRITE);
1291                 if (status < 0) {
1292                         mlog_errno(status);
1293                         goto bail;
1294                 }
1295                 new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno);
1296                 new_de->file_type = old_de->file_type;
1297                 new_dir->i_version++;
1298                 status = ocfs2_journal_dirty(handle, new_de_bh);
1299                 if (status < 0) {
1300                         mlog_errno(status);
1301                         goto bail;
1302                 }
1303
1304                 if (S_ISDIR(new_inode->i_mode))
1305                         newfe->i_links_count = 0;
1306                 else
1307                         le16_add_cpu(&newfe->i_links_count, -1);
1308
1309                 status = ocfs2_journal_dirty(handle, newfe_bh);
1310                 if (status < 0) {
1311                         mlog_errno(status);
1312                         goto bail;
1313                 }
1314         } else {
1315                 /* if the name was not found in new_dir, add it now */
1316                 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1317                                          OCFS2_I(old_inode)->ip_blkno,
1318                                          new_dir_bh, insert_entry_bh);
1319         }
1320
1321         old_inode->i_ctime = CURRENT_TIME;
1322         mark_inode_dirty(old_inode);
1323
1324         /* now that the name has been added to new_dir, remove the old name */
1325         status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1326         if (status < 0) {
1327                 mlog_errno(status);
1328                 goto bail;
1329         }
1330
1331         if (new_inode) {
1332                 new_inode->i_nlink--;
1333                 new_inode->i_ctime = CURRENT_TIME;
1334         }
1335         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1336         if (old_inode_de_bh) {
1337                 status = ocfs2_journal_access(handle, old_inode,
1338                                              old_inode_de_bh,
1339                                              OCFS2_JOURNAL_ACCESS_WRITE);
1340                 PARENT_INO(old_inode_de_bh->b_data) =
1341                         cpu_to_le64(OCFS2_I(new_dir)->ip_blkno);
1342                 status = ocfs2_journal_dirty(handle, old_inode_de_bh);
1343                 old_dir->i_nlink--;
1344                 if (new_inode) {
1345                         new_inode->i_nlink--;
1346                 } else {
1347                         new_dir->i_nlink++;
1348                         mark_inode_dirty(new_dir);
1349                 }
1350         }
1351         mark_inode_dirty(old_dir);
1352         if (new_inode)
1353                 mark_inode_dirty(new_inode);
1354
1355         if (old_dir != new_dir)
1356                 if (new_dir_nlink != new_dir->i_nlink) {
1357                         if (!new_dir_bh) {
1358                                 mlog(ML_ERROR, "need to change nlink for new "
1359                                      "dir %llu from %d to %d but bh is NULL\n",
1360                                      (unsigned long long)OCFS2_I(new_dir)->ip_blkno,
1361                                      (int)new_dir_nlink, new_dir->i_nlink);
1362                         } else {
1363                                 struct ocfs2_dinode *fe;
1364                                 status = ocfs2_journal_access(handle,
1365                                                               new_dir,
1366                                                               new_dir_bh,
1367                                                               OCFS2_JOURNAL_ACCESS_WRITE);
1368                                 fe = (struct ocfs2_dinode *) new_dir_bh->b_data;
1369                                 fe->i_links_count = cpu_to_le16(new_dir->i_nlink);
1370                                 status = ocfs2_journal_dirty(handle, new_dir_bh);
1371                         }
1372                 }
1373
1374         if (old_dir_nlink != old_dir->i_nlink) {
1375                 if (!old_dir_bh) {
1376                         mlog(ML_ERROR, "need to change nlink for old dir "
1377                              "%llu from %d to %d but bh is NULL!\n",
1378                              (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1379                              (int)old_dir_nlink, old_dir->i_nlink);
1380                 } else {
1381                         struct ocfs2_dinode *fe;
1382                         status = ocfs2_journal_access(handle, old_dir,
1383                                                       old_dir_bh,
1384                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1385                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1386                         fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1387                         status = ocfs2_journal_dirty(handle, old_dir_bh);
1388                 }
1389         }
1390
1391         status = 0;
1392 bail:
1393         if (rename_lock)
1394                 ocfs2_rename_unlock(osb);
1395
1396         if (handle)
1397                 ocfs2_commit_trans(handle);
1398
1399         if (new_inode)
1400                 sync_mapping_buffers(old_inode->i_mapping);
1401
1402         if (new_inode)
1403                 iput(new_inode);
1404         if (newfe_bh)
1405                 brelse(newfe_bh);
1406         if (old_dir_bh)
1407                 brelse(old_dir_bh);
1408         if (new_dir_bh)
1409                 brelse(new_dir_bh);
1410         if (new_de_bh)
1411                 brelse(new_de_bh);
1412         if (old_de_bh)
1413                 brelse(old_de_bh);
1414         if (old_inode_de_bh)
1415                 brelse(old_inode_de_bh);
1416         if (orphan_entry_bh)
1417                 brelse(orphan_entry_bh);
1418         if (insert_entry_bh)
1419                 brelse(insert_entry_bh);
1420
1421         mlog_exit(status);
1422
1423         return status;
1424 }
1425
1426 /*
1427  * we expect i_size = strlen(symname). Copy symname into the file
1428  * data, including the null terminator.
1429  */
1430 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1431                                      struct ocfs2_journal_handle *handle,
1432                                      struct inode *inode,
1433                                      const char *symname)
1434 {
1435         struct buffer_head **bhs = NULL;
1436         const char *c;
1437         struct super_block *sb = osb->sb;
1438         u64 p_blkno;
1439         int p_blocks;
1440         int virtual, blocks, status, i, bytes_left;
1441
1442         bytes_left = i_size_read(inode) + 1;
1443         /* we can't trust i_blocks because we're actually going to
1444          * write i_size + 1 bytes. */
1445         blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1446
1447         mlog_entry("i_blocks = %lu, i_size = %llu, blocks = %d\n",
1448                        inode->i_blocks, i_size_read(inode), blocks);
1449
1450         /* Sanity check -- make sure we're going to fit. */
1451         if (bytes_left >
1452             ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1453                 status = -EIO;
1454                 mlog_errno(status);
1455                 goto bail;
1456         }
1457
1458         bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1459         if (!bhs) {
1460                 status = -ENOMEM;
1461                 mlog_errno(status);
1462                 goto bail;
1463         }
1464
1465         status = ocfs2_extent_map_get_blocks(inode, 0, 1, &p_blkno,
1466                                              &p_blocks);
1467         if (status < 0) {
1468                 mlog_errno(status);
1469                 goto bail;
1470         }
1471
1472         /* links can never be larger than one cluster so we know this
1473          * is all going to be contiguous, but do a sanity check
1474          * anyway. */
1475         if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1476                 status = -EIO;
1477                 mlog_errno(status);
1478                 goto bail;
1479         }
1480
1481         virtual = 0;
1482         while(bytes_left > 0) {
1483                 c = &symname[virtual * sb->s_blocksize];
1484
1485                 bhs[virtual] = sb_getblk(sb, p_blkno);
1486                 if (!bhs[virtual]) {
1487                         status = -ENOMEM;
1488                         mlog_errno(status);
1489                         goto bail;
1490                 }
1491                 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1492
1493                 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1494                                               OCFS2_JOURNAL_ACCESS_CREATE);
1495                 if (status < 0) {
1496                         mlog_errno(status);
1497                         goto bail;
1498                 }
1499
1500                 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1501
1502                 memcpy(bhs[virtual]->b_data, c,
1503                        (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1504                        bytes_left);
1505
1506                 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1507                 if (status < 0) {
1508                         mlog_errno(status);
1509                         goto bail;
1510                 }
1511
1512                 virtual++;
1513                 p_blkno++;
1514                 bytes_left -= sb->s_blocksize;
1515         }
1516
1517         status = 0;
1518 bail:
1519
1520         if (bhs) {
1521                 for(i = 0; i < blocks; i++)
1522                         if (bhs[i])
1523                                 brelse(bhs[i]);
1524                 kfree(bhs);
1525         }
1526
1527         mlog_exit(status);
1528         return status;
1529 }
1530
1531 static int ocfs2_symlink(struct inode *dir,
1532                          struct dentry *dentry,
1533                          const char *symname)
1534 {
1535         int status, l, credits;
1536         u64 newsize;
1537         struct ocfs2_super *osb = NULL;
1538         struct inode *inode = NULL;
1539         struct super_block *sb;
1540         struct buffer_head *new_fe_bh = NULL;
1541         struct buffer_head *de_bh = NULL;
1542         struct buffer_head *parent_fe_bh = NULL;
1543         struct ocfs2_dinode *fe = NULL;
1544         struct ocfs2_dinode *dirfe;
1545         struct ocfs2_journal_handle *handle = NULL;
1546         struct ocfs2_alloc_context *inode_ac = NULL;
1547         struct ocfs2_alloc_context *data_ac = NULL;
1548
1549         mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1550                    dentry, symname, dentry->d_name.len, dentry->d_name.name);
1551
1552         sb = dir->i_sb;
1553         osb = OCFS2_SB(sb);
1554
1555         l = strlen(symname) + 1;
1556
1557         credits = ocfs2_calc_symlink_credits(sb);
1558
1559         handle = ocfs2_alloc_handle(osb);
1560         if (handle == NULL) {
1561                 status = -ENOMEM;
1562                 mlog_errno(status);
1563                 goto bail;
1564         }
1565
1566         /* lock the parent directory */
1567         status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
1568         if (status < 0) {
1569                 if (status != -ENOENT)
1570                         mlog_errno(status);
1571                 goto bail;
1572         }
1573
1574         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1575         if (!dirfe->i_links_count) {
1576                 /* can't make a file in a deleted directory. */
1577                 status = -ENOENT;
1578                 goto bail;
1579         }
1580
1581         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1582                                            dentry->d_name.len);
1583         if (status)
1584                 goto bail;
1585
1586         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1587                                               dentry->d_name.name,
1588                                               dentry->d_name.len, &de_bh);
1589         if (status < 0) {
1590                 mlog_errno(status);
1591                 goto bail;
1592         }
1593
1594         status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
1595         if (status < 0) {
1596                 if (status != -ENOSPC)
1597                         mlog_errno(status);
1598                 goto bail;
1599         }
1600
1601         /* don't reserve bitmap space for fast symlinks. */
1602         if (l > ocfs2_fast_symlink_chars(sb)) {
1603                 status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
1604                 if (status < 0) {
1605                         if (status != -ENOSPC)
1606                                 mlog_errno(status);
1607                         goto bail;
1608                 }
1609         }
1610
1611         handle = ocfs2_start_trans(osb, handle, credits);
1612         if (IS_ERR(handle)) {
1613                 status = PTR_ERR(handle);
1614                 handle = NULL;
1615                 mlog_errno(status);
1616                 goto bail;
1617         }
1618
1619         status = ocfs2_mknod_locked(osb, dir, dentry,
1620                                     S_IFLNK | S_IRWXUGO, 0,
1621                                     &new_fe_bh, parent_fe_bh, handle,
1622                                     &inode, inode_ac);
1623         if (status < 0) {
1624                 mlog_errno(status);
1625                 goto bail;
1626         }
1627
1628         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1629         inode->i_rdev = 0;
1630         newsize = l - 1;
1631         if (l > ocfs2_fast_symlink_chars(sb)) {
1632                 inode->i_op = &ocfs2_symlink_inode_operations;
1633                 status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh,
1634                                                     handle, data_ac, NULL,
1635                                                     NULL);
1636                 if (status < 0) {
1637                         if (status != -ENOSPC && status != -EINTR) {
1638                                 mlog(ML_ERROR,
1639                                      "Failed to extend file to %llu\n",
1640                                      (unsigned long long)newsize);
1641                                 mlog_errno(status);
1642                                 status = -ENOSPC;
1643                         }
1644                         goto bail;
1645                 }
1646                 i_size_write(inode, newsize);
1647                 inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize);
1648         } else {
1649                 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1650                 memcpy((char *) fe->id2.i_symlink, symname, l);
1651                 i_size_write(inode, newsize);
1652                 inode->i_blocks = 0;
1653         }
1654
1655         status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1656         if (status < 0) {
1657                 mlog_errno(status);
1658                 goto bail;
1659         }
1660
1661         if (!ocfs2_inode_is_fast_symlink(inode)) {
1662                 status = ocfs2_create_symlink_data(osb, handle, inode,
1663                                                    symname);
1664                 if (status < 0) {
1665                         mlog_errno(status);
1666                         goto bail;
1667                 }
1668         }
1669
1670         status = ocfs2_add_entry(handle, dentry, inode,
1671                                  le64_to_cpu(fe->i_blkno), parent_fe_bh,
1672                                  de_bh);
1673         if (status < 0) {
1674                 mlog_errno(status);
1675                 goto bail;
1676         }
1677
1678         insert_inode_hash(inode);
1679         dentry->d_op = &ocfs2_dentry_ops;
1680         d_instantiate(dentry, inode);
1681 bail:
1682         if (handle)
1683                 ocfs2_commit_trans(handle);
1684         if (new_fe_bh)
1685                 brelse(new_fe_bh);
1686         if (parent_fe_bh)
1687                 brelse(parent_fe_bh);
1688         if (de_bh)
1689                 brelse(de_bh);
1690         if (inode_ac)
1691                 ocfs2_free_alloc_context(inode_ac);
1692         if (data_ac)
1693                 ocfs2_free_alloc_context(data_ac);
1694         if ((status < 0) && inode)
1695                 iput(inode);
1696
1697         mlog_exit(status);
1698
1699         return status;
1700 }
1701
1702 int ocfs2_check_dir_entry(struct inode * dir,
1703                           struct ocfs2_dir_entry * de,
1704                           struct buffer_head * bh,
1705                           unsigned long offset)
1706 {
1707         const char *error_msg = NULL;
1708         const int rlen = le16_to_cpu(de->rec_len);
1709
1710         if (rlen < OCFS2_DIR_REC_LEN(1))
1711                 error_msg = "rec_len is smaller than minimal";
1712         else if (rlen % 4 != 0)
1713                 error_msg = "rec_len % 4 != 0";
1714         else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
1715                 error_msg = "rec_len is too small for name_len";
1716         else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
1717                 error_msg = "directory entry across blocks";
1718
1719         if (error_msg != NULL)
1720                 mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
1721                      "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
1722                      (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
1723                      offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
1724                      de->name_len);
1725         return error_msg == NULL ? 1 : 0;
1726 }
1727
1728 /* we don't always have a dentry for what we want to add, so people
1729  * like orphan dir can call this instead.
1730  *
1731  * If you pass me insert_bh, I'll skip the search of the other dir
1732  * blocks and put the record in there.
1733  */
1734 static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle,
1735                              struct inode *dir,
1736                              const char *name, int namelen,
1737                              struct inode *inode, u64 blkno,
1738                              struct buffer_head *parent_fe_bh,
1739                              struct buffer_head *insert_bh)
1740 {
1741         unsigned long offset;
1742         unsigned short rec_len;
1743         struct ocfs2_dir_entry *de, *de1;
1744         struct super_block *sb;
1745         int retval, status;
1746
1747         mlog_entry_void();
1748
1749         sb = dir->i_sb;
1750
1751         if (!namelen)
1752                 return -EINVAL;
1753
1754         rec_len = OCFS2_DIR_REC_LEN(namelen);
1755         offset = 0;
1756         de = (struct ocfs2_dir_entry *) insert_bh->b_data;
1757         while (1) {
1758                 BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data);
1759                 /* These checks should've already been passed by the
1760                  * prepare function, but I guess we can leave them
1761                  * here anyway. */
1762                 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
1763                         retval = -ENOENT;
1764                         goto bail;
1765                 }
1766                 if (ocfs2_match(namelen, name, de)) {
1767                         retval = -EEXIST;
1768                         goto bail;
1769                 }
1770                 if (((le64_to_cpu(de->inode) == 0) &&
1771                      (le16_to_cpu(de->rec_len) >= rec_len)) ||
1772                     (le16_to_cpu(de->rec_len) >=
1773                      (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
1774                         status = ocfs2_journal_access(handle, dir, insert_bh,
1775                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1776                         /* By now the buffer is marked for journaling */
1777                         offset += le16_to_cpu(de->rec_len);
1778                         if (le64_to_cpu(de->inode)) {
1779                                 de1 = (struct ocfs2_dir_entry *)((char *) de +
1780                                         OCFS2_DIR_REC_LEN(de->name_len));
1781                                 de1->rec_len =
1782                                         cpu_to_le16(le16_to_cpu(de->rec_len) -
1783                                         OCFS2_DIR_REC_LEN(de->name_len));
1784                                 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
1785                                 de = de1;
1786                         }
1787                         de->file_type = OCFS2_FT_UNKNOWN;
1788                         if (blkno) {
1789                                 de->inode = cpu_to_le64(blkno);
1790                                 ocfs2_set_de_type(de, inode->i_mode);
1791                         } else
1792                                 de->inode = 0;
1793                         de->name_len = namelen;
1794                         memcpy(de->name, name, namelen);
1795
1796                         dir->i_mtime = dir->i_ctime = CURRENT_TIME;
1797                         dir->i_version++;
1798                         status = ocfs2_journal_dirty(handle, insert_bh);
1799                         retval = 0;
1800                         goto bail;
1801                 }
1802                 offset += le16_to_cpu(de->rec_len);
1803                 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
1804         }
1805
1806         /* when you think about it, the assert above should prevent us
1807          * from ever getting here. */
1808         retval = -ENOSPC;
1809 bail:
1810
1811         mlog_exit(retval);
1812         return retval;
1813 }
1814
1815
1816 /*
1817  * ocfs2_delete_entry deletes a directory entry by merging it with the
1818  * previous entry
1819  */
1820 static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle,
1821                               struct inode *dir,
1822                               struct ocfs2_dir_entry *de_del,
1823                               struct buffer_head *bh)
1824 {
1825         struct ocfs2_dir_entry *de, *pde;
1826         int i, status = -ENOENT;
1827
1828         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
1829
1830         i = 0;
1831         pde = NULL;
1832         de = (struct ocfs2_dir_entry *) bh->b_data;
1833         while (i < bh->b_size) {
1834                 if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
1835                         status = -EIO;
1836                         mlog_errno(status);
1837                         goto bail;
1838                 }
1839                 if (de == de_del)  {
1840                         status = ocfs2_journal_access(handle, dir, bh,
1841                                                       OCFS2_JOURNAL_ACCESS_WRITE);
1842                         if (status < 0) {
1843                                 status = -EIO;
1844                                 mlog_errno(status);
1845                                 goto bail;
1846                         }
1847                         if (pde)
1848                                 pde->rec_len =
1849                                         cpu_to_le16(le16_to_cpu(pde->rec_len) +
1850                                                     le16_to_cpu(de->rec_len));
1851                         else
1852                                 de->inode = 0;
1853                         dir->i_version++;
1854                         status = ocfs2_journal_dirty(handle, bh);
1855                         goto bail;
1856                 }
1857                 i += le16_to_cpu(de->rec_len);
1858                 pde = de;
1859                 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
1860         }
1861 bail:
1862         mlog_exit(status);
1863         return status;
1864 }
1865
1866 /*
1867  * Returns 0 if not found, -1 on failure, and 1 on success
1868  */
1869 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
1870                                         struct inode *dir,
1871                                         const char *name, int namelen,
1872                                         unsigned long offset,
1873                                         struct ocfs2_dir_entry **res_dir)
1874 {
1875         struct ocfs2_dir_entry *de;
1876         char *dlimit, *de_buf;
1877         int de_len;
1878         int ret = 0;
1879
1880         mlog_entry_void();
1881
1882         de_buf = bh->b_data;
1883         dlimit = de_buf + dir->i_sb->s_blocksize;
1884
1885         while (de_buf < dlimit) {
1886                 /* this code is executed quadratically often */
1887                 /* do minimal checking `by hand' */
1888
1889                 de = (struct ocfs2_dir_entry *) de_buf;
1890
1891                 if (de_buf + namelen <= dlimit &&
1892                     ocfs2_match(namelen, name, de)) {
1893                         /* found a match - just to be sure, do a full check */
1894                         if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
1895                                 ret = -1;
1896                                 goto bail;
1897                         }
1898                         *res_dir = de;
1899                         ret = 1;
1900                         goto bail;
1901                 }
1902
1903                 /* prevent looping on a bad block */
1904                 de_len = le16_to_cpu(de->rec_len);
1905                 if (de_len <= 0) {
1906                         ret = -1;
1907                         goto bail;
1908                 }
1909
1910                 de_buf += de_len;
1911                 offset += de_len;
1912         }
1913
1914 bail:
1915         mlog_exit(ret);
1916         return ret;
1917 }
1918
1919 struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
1920                                      struct inode *dir,
1921                                      struct ocfs2_dir_entry **res_dir)
1922 {
1923         struct super_block *sb;
1924         struct buffer_head *bh_use[NAMEI_RA_SIZE];
1925         struct buffer_head *bh, *ret = NULL;
1926         unsigned long start, block, b;
1927         int ra_max = 0;         /* Number of bh's in the readahead
1928                                    buffer, bh_use[] */
1929         int ra_ptr = 0;         /* Current index into readahead
1930                                    buffer */
1931         int num = 0;
1932         int nblocks, i, err;
1933
1934         mlog_entry_void();
1935
1936         *res_dir = NULL;
1937         sb = dir->i_sb;
1938
1939         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
1940         start = OCFS2_I(dir)->ip_dir_start_lookup;
1941         if (start >= nblocks)
1942                 start = 0;
1943         block = start;
1944
1945 restart:
1946         do {
1947                 /*
1948                  * We deal with the read-ahead logic here.
1949                  */
1950                 if (ra_ptr >= ra_max) {
1951                         /* Refill the readahead buffer */
1952                         ra_ptr = 0;
1953                         b = block;
1954                         for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
1955                                 /*
1956                                  * Terminate if we reach the end of the
1957                                  * directory and must wrap, or if our
1958                                  * search has finished at this block.
1959                                  */
1960                                 if (b >= nblocks || (num && block == start)) {
1961                                         bh_use[ra_max] = NULL;
1962                                         break;
1963                                 }
1964                                 num++;
1965
1966                                 /* XXX: questionable readahead stuff here */
1967                                 bh = ocfs2_bread(dir, b++, &err, 1);
1968                                 bh_use[ra_max] = bh;
1969 #if 0           // ???
1970                                 if (bh)
1971                                         ll_rw_block(READ, 1, &bh);
1972 #endif
1973                         }
1974                 }
1975                 if ((bh = bh_use[ra_ptr++]) == NULL)
1976                         goto next;
1977                 wait_on_buffer(bh);
1978                 if (!buffer_uptodate(bh)) {
1979                         /* read error, skip block & hope for the best */
1980                         brelse(bh);
1981                         goto next;
1982                 }
1983                 i = ocfs2_search_dirblock(bh, dir, name, namelen,
1984                                           block << sb->s_blocksize_bits,
1985                                           res_dir);
1986                 if (i == 1) {
1987                         OCFS2_I(dir)->ip_dir_start_lookup = block;
1988                         ret = bh;
1989                         goto cleanup_and_exit;
1990                 } else {
1991                         brelse(bh);
1992                         if (i < 0)
1993                                 goto cleanup_and_exit;
1994                 }
1995         next:
1996                 if (++block >= nblocks)
1997                         block = 0;
1998         } while (block != start);
1999
2000         /*
2001          * If the directory has grown while we were searching, then
2002          * search the last part of the directory before giving up.
2003          */
2004         block = nblocks;
2005         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2006         if (block < nblocks) {
2007                 start = 0;
2008                 goto restart;
2009         }
2010
2011 cleanup_and_exit:
2012         /* Clean up the read-ahead blocks */
2013         for (; ra_ptr < ra_max; ra_ptr++)
2014                 brelse(bh_use[ra_ptr]);
2015
2016         mlog_exit_ptr(ret);
2017         return ret;
2018 }
2019
2020 static int ocfs2_blkno_stringify(u64 blkno, char *name)
2021 {
2022         int status, namelen;
2023
2024         mlog_entry_void();
2025
2026         namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
2027                            (long long)blkno);
2028         if (namelen <= 0) {
2029                 if (namelen)
2030                         status = namelen;
2031                 else
2032                         status = -EINVAL;
2033                 mlog_errno(status);
2034                 goto bail;
2035         }
2036         if (namelen != OCFS2_ORPHAN_NAMELEN) {
2037                 status = -EINVAL;
2038                 mlog_errno(status);
2039                 goto bail;
2040         }
2041
2042         mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
2043              namelen);
2044
2045         status = 0;
2046 bail:
2047         mlog_exit(status);
2048         return status;
2049 }
2050
2051 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2052                                     struct ocfs2_journal_handle *handle,
2053                                     struct inode *inode,
2054                                     char *name,
2055                                     struct buffer_head **de_bh)
2056 {
2057         struct inode *orphan_dir_inode = NULL;
2058         struct buffer_head *orphan_dir_bh = NULL;
2059         int status = 0;
2060
2061         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2062         if (status < 0) {
2063                 mlog_errno(status);
2064                 goto leave;
2065         }
2066
2067         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2068                                                        ORPHAN_DIR_SYSTEM_INODE,
2069                                                        osb->slot_num);
2070         if (!orphan_dir_inode) {
2071                 status = -ENOENT;
2072                 mlog_errno(status);
2073                 goto leave;
2074         }
2075
2076         ocfs2_handle_add_inode(handle, orphan_dir_inode);
2077         status = ocfs2_meta_lock(orphan_dir_inode, handle, &orphan_dir_bh, 1);
2078         if (status < 0) {
2079                 mlog_errno(status);
2080                 goto leave;
2081         }
2082
2083         status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2084                                               orphan_dir_bh, name,
2085                                               OCFS2_ORPHAN_NAMELEN, de_bh);
2086         if (status < 0) {
2087                 mlog_errno(status);
2088                 goto leave;
2089         }
2090
2091 leave:
2092         if (orphan_dir_inode)
2093                 iput(orphan_dir_inode);
2094
2095         if (orphan_dir_bh)
2096                 brelse(orphan_dir_bh);
2097
2098         mlog_exit(status);
2099         return status;
2100 }
2101
2102 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2103                             struct ocfs2_journal_handle *handle,
2104                             struct inode *inode,
2105                             struct ocfs2_dinode *fe,
2106                             char *name,
2107                             struct buffer_head *de_bh)
2108 {
2109         struct inode *orphan_dir_inode = NULL;
2110         struct buffer_head *orphan_dir_bh = NULL;
2111         int status = 0;
2112         struct ocfs2_dinode *orphan_fe;
2113
2114         mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
2115
2116         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2117                                                        ORPHAN_DIR_SYSTEM_INODE,
2118                                                        osb->slot_num);
2119         if (!orphan_dir_inode) {
2120                 status = -ENOENT;
2121                 mlog_errno(status);
2122                 goto leave;
2123         }
2124
2125         status = ocfs2_read_block(osb,
2126                                   OCFS2_I(orphan_dir_inode)->ip_blkno,
2127                                   &orphan_dir_bh, OCFS2_BH_CACHED,
2128                                   orphan_dir_inode);
2129         if (status < 0) {
2130                 mlog_errno(status);
2131                 goto leave;
2132         }
2133
2134         status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
2135                                       OCFS2_JOURNAL_ACCESS_WRITE);
2136         if (status < 0) {
2137                 mlog_errno(status);
2138                 goto leave;
2139         }
2140
2141         /* we're a cluster, and nlink can change on disk from
2142          * underneath us... */
2143         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2144         if (S_ISDIR(inode->i_mode))
2145                 le16_add_cpu(&orphan_fe->i_links_count, 1);
2146         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2147
2148         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2149         if (status < 0) {
2150                 mlog_errno(status);
2151                 goto leave;
2152         }
2153
2154         status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2155                                    OCFS2_ORPHAN_NAMELEN, inode,
2156                                    OCFS2_I(inode)->ip_blkno,
2157                                    orphan_dir_bh, de_bh);
2158         if (status < 0) {
2159                 mlog_errno(status);
2160                 goto leave;
2161         }
2162
2163         le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2164
2165         /* Record which orphan dir our inode now resides
2166          * in. delete_inode will use this to determine which orphan
2167          * dir to lock. */
2168         spin_lock(&OCFS2_I(inode)->ip_lock);
2169         OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num;
2170         spin_unlock(&OCFS2_I(inode)->ip_lock);
2171
2172         mlog(0, "Inode %llu orphaned in slot %d\n",
2173              (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
2174
2175 leave:
2176         if (orphan_dir_inode)
2177                 iput(orphan_dir_inode);
2178
2179         if (orphan_dir_bh)
2180                 brelse(orphan_dir_bh);
2181
2182         mlog_exit(status);
2183         return status;
2184 }
2185
2186 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2187 int ocfs2_orphan_del(struct ocfs2_super *osb,
2188                      struct ocfs2_journal_handle *handle,
2189                      struct inode *orphan_dir_inode,
2190                      struct inode *inode,
2191                      struct buffer_head *orphan_dir_bh)
2192 {
2193         char name[OCFS2_ORPHAN_NAMELEN + 1];
2194         struct ocfs2_dinode *orphan_fe;
2195         int status = 0;
2196         struct buffer_head *target_de_bh = NULL;
2197         struct ocfs2_dir_entry *target_de = NULL;
2198
2199         mlog_entry_void();
2200
2201         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2202         if (status < 0) {
2203                 mlog_errno(status);
2204                 goto leave;
2205         }
2206
2207         mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
2208              name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2209              OCFS2_ORPHAN_NAMELEN);
2210
2211         /* find it's spot in the orphan directory */
2212         target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
2213                                         orphan_dir_inode, &target_de);
2214         if (!target_de_bh) {
2215                 status = -ENOENT;
2216                 mlog_errno(status);
2217                 goto leave;
2218         }
2219
2220         /* remove it from the orphan directory */
2221         status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
2222                                     target_de_bh);
2223         if (status < 0) {
2224                 mlog_errno(status);
2225                 goto leave;
2226         }
2227
2228         status = ocfs2_journal_access(handle,orphan_dir_inode,  orphan_dir_bh,
2229                                       OCFS2_JOURNAL_ACCESS_WRITE);
2230         if (status < 0) {
2231                 mlog_errno(status);
2232                 goto leave;
2233         }
2234
2235         /* do the i_nlink dance! :) */
2236         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2237         if (S_ISDIR(inode->i_mode))
2238                 le16_add_cpu(&orphan_fe->i_links_count, -1);
2239         orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2240
2241         status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2242         if (status < 0) {
2243                 mlog_errno(status);
2244                 goto leave;
2245         }
2246
2247 leave:
2248         if (target_de_bh)
2249                 brelse(target_de_bh);
2250
2251         mlog_exit(status);
2252         return status;
2253 }
2254
2255 struct inode_operations ocfs2_dir_iops = {
2256         .create         = ocfs2_create,
2257         .lookup         = ocfs2_lookup,
2258         .link           = ocfs2_link,
2259         .unlink         = ocfs2_unlink,
2260         .rmdir          = ocfs2_unlink,
2261         .symlink        = ocfs2_symlink,
2262         .mkdir          = ocfs2_mkdir,
2263         .mknod          = ocfs2_mknod,
2264         .rename         = ocfs2_rename,
2265         .setattr        = ocfs2_setattr,
2266         .getattr        = ocfs2_getattr,
2267 };