Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec...
[sfrench/cifs-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 #include <linux/quotaops.h>
44
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 #include "acl.h"
65 #include "ocfs2_trace.h"
66
67 #include "buffer_head_io.h"
68
69 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
70                               struct inode *dir,
71                               struct inode *inode,
72                               dev_t dev,
73                               struct buffer_head **new_fe_bh,
74                               struct buffer_head *parent_fe_bh,
75                               handle_t *handle,
76                               struct ocfs2_alloc_context *inode_ac);
77
78 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
79                                     struct inode **ret_orphan_dir,
80                                     u64 blkno,
81                                     char *name,
82                                     struct ocfs2_dir_lookup_result *lookup);
83
84 static int ocfs2_orphan_add(struct ocfs2_super *osb,
85                             handle_t *handle,
86                             struct inode *inode,
87                             struct buffer_head *fe_bh,
88                             char *name,
89                             struct ocfs2_dir_lookup_result *lookup,
90                             struct inode *orphan_dir_inode);
91
92 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
93                                      handle_t *handle,
94                                      struct inode *inode,
95                                      const char *symname);
96
97 /* An orphan dir name is an 8 byte value, printed as a hex string */
98 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
99
100 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
101                                    struct nameidata *nd)
102 {
103         int status;
104         u64 blkno;
105         struct inode *inode = NULL;
106         struct dentry *ret;
107         struct ocfs2_inode_info *oi;
108
109         trace_ocfs2_lookup(dir, dentry, dentry->d_name.len,
110                            dentry->d_name.name,
111                            (unsigned long long)OCFS2_I(dir)->ip_blkno, 0);
112
113         if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
114                 ret = ERR_PTR(-ENAMETOOLONG);
115                 goto bail;
116         }
117
118         status = ocfs2_inode_lock_nested(dir, NULL, 0, OI_LS_PARENT);
119         if (status < 0) {
120                 if (status != -ENOENT)
121                         mlog_errno(status);
122                 ret = ERR_PTR(status);
123                 goto bail;
124         }
125
126         status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
127                                             dentry->d_name.len, &blkno);
128         if (status < 0)
129                 goto bail_add;
130
131         inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
132         if (IS_ERR(inode)) {
133                 ret = ERR_PTR(-EACCES);
134                 goto bail_unlock;
135         }
136
137         oi = OCFS2_I(inode);
138         /* Clear any orphaned state... If we were able to look up the
139          * inode from a directory, it certainly can't be orphaned. We
140          * might have the bad state from a node which intended to
141          * orphan this inode but crashed before it could commit the
142          * unlink. */
143         spin_lock(&oi->ip_lock);
144         oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
145         spin_unlock(&oi->ip_lock);
146
147 bail_add:
148         ret = d_splice_alias(inode, dentry);
149
150         if (inode) {
151                 /*
152                  * If d_splice_alias() finds a DCACHE_DISCONNECTED
153                  * dentry, it will d_move() it on top of ourse. The
154                  * return value will indicate this however, so in
155                  * those cases, we switch them around for the locking
156                  * code.
157                  *
158                  * NOTE: This dentry already has ->d_op set from
159                  * ocfs2_get_parent() and ocfs2_get_dentry()
160                  */
161                 if (ret)
162                         dentry = ret;
163
164                 status = ocfs2_dentry_attach_lock(dentry, inode,
165                                                   OCFS2_I(dir)->ip_blkno);
166                 if (status) {
167                         mlog_errno(status);
168                         ret = ERR_PTR(status);
169                         goto bail_unlock;
170                 }
171         } else
172                 ocfs2_dentry_attach_gen(dentry);
173
174 bail_unlock:
175         /* Don't drop the cluster lock until *after* the d_add --
176          * unlink on another node will message us to remove that
177          * dentry under this lock so otherwise we can race this with
178          * the downconvert thread and have a stale dentry. */
179         ocfs2_inode_unlock(dir, 0);
180
181 bail:
182
183         trace_ocfs2_lookup_ret(ret);
184
185         return ret;
186 }
187
188 static struct inode *ocfs2_get_init_inode(struct inode *dir, int mode)
189 {
190         struct inode *inode;
191
192         inode = new_inode(dir->i_sb);
193         if (!inode) {
194                 mlog(ML_ERROR, "new_inode failed!\n");
195                 return NULL;
196         }
197
198         /* populate as many fields early on as possible - many of
199          * these are used by the support functions here and in
200          * callers. */
201         if (S_ISDIR(mode))
202                 inode->i_nlink = 2;
203         else
204                 inode->i_nlink = 1;
205         inode_init_owner(inode, dir, mode);
206         dquot_initialize(inode);
207         return inode;
208 }
209
210 static int ocfs2_mknod(struct inode *dir,
211                        struct dentry *dentry,
212                        int mode,
213                        dev_t dev)
214 {
215         int status = 0;
216         struct buffer_head *parent_fe_bh = NULL;
217         handle_t *handle = NULL;
218         struct ocfs2_super *osb;
219         struct ocfs2_dinode *dirfe;
220         struct buffer_head *new_fe_bh = NULL;
221         struct inode *inode = NULL;
222         struct ocfs2_alloc_context *inode_ac = NULL;
223         struct ocfs2_alloc_context *data_ac = NULL;
224         struct ocfs2_alloc_context *meta_ac = NULL;
225         int want_clusters = 0;
226         int want_meta = 0;
227         int xattr_credits = 0;
228         struct ocfs2_security_xattr_info si = {
229                 .enable = 1,
230         };
231         int did_quota_inode = 0;
232         struct ocfs2_dir_lookup_result lookup = { NULL, };
233         sigset_t oldset;
234         int did_block_signals = 0;
235
236         trace_ocfs2_mknod(dir, dentry, dentry->d_name.len, dentry->d_name.name,
237                           (unsigned long long)OCFS2_I(dir)->ip_blkno,
238                           (unsigned long)dev, mode);
239
240         dquot_initialize(dir);
241
242         /* get our super block */
243         osb = OCFS2_SB(dir->i_sb);
244
245         status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
246         if (status < 0) {
247                 if (status != -ENOENT)
248                         mlog_errno(status);
249                 return status;
250         }
251
252         if (S_ISDIR(mode) && (dir->i_nlink >= ocfs2_link_max(osb))) {
253                 status = -EMLINK;
254                 goto leave;
255         }
256
257         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
258         if (!ocfs2_read_links_count(dirfe)) {
259                 /* can't make a file in a deleted directory. */
260                 status = -ENOENT;
261                 goto leave;
262         }
263
264         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
265                                            dentry->d_name.len);
266         if (status)
267                 goto leave;
268
269         /* get a spot inside the dir. */
270         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
271                                               dentry->d_name.name,
272                                               dentry->d_name.len, &lookup);
273         if (status < 0) {
274                 mlog_errno(status);
275                 goto leave;
276         }
277
278         /* reserve an inode spot */
279         status = ocfs2_reserve_new_inode(osb, &inode_ac);
280         if (status < 0) {
281                 if (status != -ENOSPC)
282                         mlog_errno(status);
283                 goto leave;
284         }
285
286         inode = ocfs2_get_init_inode(dir, mode);
287         if (!inode) {
288                 status = -ENOMEM;
289                 mlog_errno(status);
290                 goto leave;
291         }
292
293         /* get security xattr */
294         status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
295         if (status) {
296                 if (status == -EOPNOTSUPP)
297                         si.enable = 0;
298                 else {
299                         mlog_errno(status);
300                         goto leave;
301                 }
302         }
303
304         /* calculate meta data/clusters for setting security and acl xattr */
305         status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
306                                        &si, &want_clusters,
307                                        &xattr_credits, &want_meta);
308         if (status < 0) {
309                 mlog_errno(status);
310                 goto leave;
311         }
312
313         /* Reserve a cluster if creating an extent based directory. */
314         if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
315                 want_clusters += 1;
316
317                 /* Dir indexing requires extra space as well */
318                 if (ocfs2_supports_indexed_dirs(osb))
319                         want_meta++;
320         }
321
322         status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac);
323         if (status < 0) {
324                 if (status != -ENOSPC)
325                         mlog_errno(status);
326                 goto leave;
327         }
328
329         status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
330         if (status < 0) {
331                 if (status != -ENOSPC)
332                         mlog_errno(status);
333                 goto leave;
334         }
335
336         handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb,
337                                                             S_ISDIR(mode),
338                                                             xattr_credits));
339         if (IS_ERR(handle)) {
340                 status = PTR_ERR(handle);
341                 handle = NULL;
342                 mlog_errno(status);
343                 goto leave;
344         }
345
346         /* Starting to change things, restart is no longer possible. */
347         ocfs2_block_signals(&oldset);
348         did_block_signals = 1;
349
350         status = dquot_alloc_inode(inode);
351         if (status)
352                 goto leave;
353         did_quota_inode = 1;
354
355         /* do the real work now. */
356         status = ocfs2_mknod_locked(osb, dir, inode, dev,
357                                     &new_fe_bh, parent_fe_bh, handle,
358                                     inode_ac);
359         if (status < 0) {
360                 mlog_errno(status);
361                 goto leave;
362         }
363
364         if (S_ISDIR(mode)) {
365                 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
366                                             new_fe_bh, data_ac, meta_ac);
367                 if (status < 0) {
368                         mlog_errno(status);
369                         goto leave;
370                 }
371
372                 status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
373                                                  parent_fe_bh,
374                                                  OCFS2_JOURNAL_ACCESS_WRITE);
375                 if (status < 0) {
376                         mlog_errno(status);
377                         goto leave;
378                 }
379                 ocfs2_add_links_count(dirfe, 1);
380                 ocfs2_journal_dirty(handle, parent_fe_bh);
381                 inc_nlink(dir);
382         }
383
384         status = ocfs2_init_acl(handle, inode, dir, new_fe_bh, parent_fe_bh,
385                                 meta_ac, data_ac);
386         if (status < 0) {
387                 mlog_errno(status);
388                 goto leave;
389         }
390
391         if (si.enable) {
392                 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
393                                                  meta_ac, data_ac);
394                 if (status < 0) {
395                         mlog_errno(status);
396                         goto leave;
397                 }
398         }
399
400         /*
401          * Do this before adding the entry to the directory. We add
402          * also set d_op after success so that ->d_iput() will cleanup
403          * the dentry lock even if ocfs2_add_entry() fails below.
404          */
405         status = ocfs2_dentry_attach_lock(dentry, inode,
406                                           OCFS2_I(dir)->ip_blkno);
407         if (status) {
408                 mlog_errno(status);
409                 goto leave;
410         }
411
412         status = ocfs2_add_entry(handle, dentry, inode,
413                                  OCFS2_I(inode)->ip_blkno, parent_fe_bh,
414                                  &lookup);
415         if (status < 0) {
416                 mlog_errno(status);
417                 goto leave;
418         }
419
420         insert_inode_hash(inode);
421         d_instantiate(dentry, inode);
422         status = 0;
423 leave:
424         if (status < 0 && did_quota_inode)
425                 dquot_free_inode(inode);
426         if (handle)
427                 ocfs2_commit_trans(osb, handle);
428
429         ocfs2_inode_unlock(dir, 1);
430         if (did_block_signals)
431                 ocfs2_unblock_signals(&oldset);
432
433         brelse(new_fe_bh);
434         brelse(parent_fe_bh);
435         kfree(si.name);
436         kfree(si.value);
437
438         ocfs2_free_dir_lookup_result(&lookup);
439
440         if (inode_ac)
441                 ocfs2_free_alloc_context(inode_ac);
442
443         if (data_ac)
444                 ocfs2_free_alloc_context(data_ac);
445
446         if (meta_ac)
447                 ocfs2_free_alloc_context(meta_ac);
448
449         /*
450          * We should call iput after the i_mutex of the bitmap been
451          * unlocked in ocfs2_free_alloc_context, or the
452          * ocfs2_delete_inode will mutex_lock again.
453          */
454         if ((status < 0) && inode) {
455                 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
456                 clear_nlink(inode);
457                 iput(inode);
458         }
459
460         if (status)
461                 mlog_errno(status);
462
463         return status;
464 }
465
466 static int __ocfs2_mknod_locked(struct inode *dir,
467                                 struct inode *inode,
468                                 dev_t dev,
469                                 struct buffer_head **new_fe_bh,
470                                 struct buffer_head *parent_fe_bh,
471                                 handle_t *handle,
472                                 struct ocfs2_alloc_context *inode_ac,
473                                 u64 fe_blkno, u64 suballoc_loc, u16 suballoc_bit)
474 {
475         int status = 0;
476         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
477         struct ocfs2_dinode *fe = NULL;
478         struct ocfs2_extent_list *fel;
479         u16 feat;
480
481         *new_fe_bh = NULL;
482
483         /* populate as many fields early on as possible - many of
484          * these are used by the support functions here and in
485          * callers. */
486         inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
487         OCFS2_I(inode)->ip_blkno = fe_blkno;
488         spin_lock(&osb->osb_lock);
489         inode->i_generation = osb->s_next_generation++;
490         spin_unlock(&osb->osb_lock);
491
492         *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
493         if (!*new_fe_bh) {
494                 status = -EIO;
495                 mlog_errno(status);
496                 goto leave;
497         }
498         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), *new_fe_bh);
499
500         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
501                                          *new_fe_bh,
502                                          OCFS2_JOURNAL_ACCESS_CREATE);
503         if (status < 0) {
504                 mlog_errno(status);
505                 goto leave;
506         }
507
508         fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
509         memset(fe, 0, osb->sb->s_blocksize);
510
511         fe->i_generation = cpu_to_le32(inode->i_generation);
512         fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
513         fe->i_blkno = cpu_to_le64(fe_blkno);
514         fe->i_suballoc_loc = cpu_to_le64(suballoc_loc);
515         fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
516         fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot);
517         fe->i_uid = cpu_to_le32(inode->i_uid);
518         fe->i_gid = cpu_to_le32(inode->i_gid);
519         fe->i_mode = cpu_to_le16(inode->i_mode);
520         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
521                 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
522
523         ocfs2_set_links_count(fe, inode->i_nlink);
524
525         fe->i_last_eb_blk = 0;
526         strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
527         le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
528         fe->i_atime = fe->i_ctime = fe->i_mtime =
529                 cpu_to_le64(CURRENT_TIME.tv_sec);
530         fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
531                 cpu_to_le32(CURRENT_TIME.tv_nsec);
532         fe->i_dtime = 0;
533
534         /*
535          * If supported, directories start with inline data. If inline
536          * isn't supported, but indexing is, we start them as indexed.
537          */
538         feat = le16_to_cpu(fe->i_dyn_features);
539         if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
540                 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
541
542                 fe->id2.i_data.id_count = cpu_to_le16(
543                                 ocfs2_max_inline_data_with_xattr(osb->sb, fe));
544         } else {
545                 fel = &fe->id2.i_list;
546                 fel->l_tree_depth = 0;
547                 fel->l_next_free_rec = 0;
548                 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
549         }
550
551         ocfs2_journal_dirty(handle, *new_fe_bh);
552
553         ocfs2_populate_inode(inode, fe, 1);
554         ocfs2_ci_set_new(osb, INODE_CACHE(inode));
555         if (!ocfs2_mount_local(osb)) {
556                 status = ocfs2_create_new_inode_locks(inode);
557                 if (status < 0)
558                         mlog_errno(status);
559         }
560
561         status = 0; /* error in ocfs2_create_new_inode_locks is not
562                      * critical */
563
564 leave:
565         if (status < 0) {
566                 if (*new_fe_bh) {
567                         brelse(*new_fe_bh);
568                         *new_fe_bh = NULL;
569                 }
570         }
571
572         if (status)
573                 mlog_errno(status);
574         return status;
575 }
576
577 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
578                               struct inode *dir,
579                               struct inode *inode,
580                               dev_t dev,
581                               struct buffer_head **new_fe_bh,
582                               struct buffer_head *parent_fe_bh,
583                               handle_t *handle,
584                               struct ocfs2_alloc_context *inode_ac)
585 {
586         int status = 0;
587         u64 suballoc_loc, fe_blkno = 0;
588         u16 suballoc_bit;
589
590         *new_fe_bh = NULL;
591
592         status = ocfs2_claim_new_inode(handle, dir, parent_fe_bh,
593                                        inode_ac, &suballoc_loc,
594                                        &suballoc_bit, &fe_blkno);
595         if (status < 0) {
596                 mlog_errno(status);
597                 return status;
598         }
599
600         return __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
601                                     parent_fe_bh, handle, inode_ac,
602                                     fe_blkno, suballoc_loc, suballoc_bit);
603 }
604
605 static int ocfs2_mkdir(struct inode *dir,
606                        struct dentry *dentry,
607                        int mode)
608 {
609         int ret;
610
611         trace_ocfs2_mkdir(dir, dentry, dentry->d_name.len, dentry->d_name.name,
612                           OCFS2_I(dir)->ip_blkno, mode);
613         ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
614         if (ret)
615                 mlog_errno(ret);
616
617         return ret;
618 }
619
620 static int ocfs2_create(struct inode *dir,
621                         struct dentry *dentry,
622                         int mode,
623                         struct nameidata *nd)
624 {
625         int ret;
626
627         trace_ocfs2_create(dir, dentry, dentry->d_name.len, dentry->d_name.name,
628                            (unsigned long long)OCFS2_I(dir)->ip_blkno, mode);
629         ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
630         if (ret)
631                 mlog_errno(ret);
632
633         return ret;
634 }
635
636 static int ocfs2_link(struct dentry *old_dentry,
637                       struct inode *dir,
638                       struct dentry *dentry)
639 {
640         handle_t *handle;
641         struct inode *inode = old_dentry->d_inode;
642         int err;
643         struct buffer_head *fe_bh = NULL;
644         struct buffer_head *parent_fe_bh = NULL;
645         struct ocfs2_dinode *fe = NULL;
646         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
647         struct ocfs2_dir_lookup_result lookup = { NULL, };
648         sigset_t oldset;
649
650         trace_ocfs2_link((unsigned long long)OCFS2_I(inode)->ip_blkno,
651                          old_dentry->d_name.len, old_dentry->d_name.name,
652                          dentry->d_name.len, dentry->d_name.name);
653
654         if (S_ISDIR(inode->i_mode))
655                 return -EPERM;
656
657         dquot_initialize(dir);
658
659         err = ocfs2_inode_lock_nested(dir, &parent_fe_bh, 1, OI_LS_PARENT);
660         if (err < 0) {
661                 if (err != -ENOENT)
662                         mlog_errno(err);
663                 return err;
664         }
665
666         if (!dir->i_nlink) {
667                 err = -ENOENT;
668                 goto out;
669         }
670
671         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
672                                         dentry->d_name.len);
673         if (err)
674                 goto out;
675
676         err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
677                                            dentry->d_name.name,
678                                            dentry->d_name.len, &lookup);
679         if (err < 0) {
680                 mlog_errno(err);
681                 goto out;
682         }
683
684         err = ocfs2_inode_lock(inode, &fe_bh, 1);
685         if (err < 0) {
686                 if (err != -ENOENT)
687                         mlog_errno(err);
688                 goto out;
689         }
690
691         fe = (struct ocfs2_dinode *) fe_bh->b_data;
692         if (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) {
693                 err = -EMLINK;
694                 goto out_unlock_inode;
695         }
696
697         handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb));
698         if (IS_ERR(handle)) {
699                 err = PTR_ERR(handle);
700                 handle = NULL;
701                 mlog_errno(err);
702                 goto out_unlock_inode;
703         }
704
705         /* Starting to change things, restart is no longer possible. */
706         ocfs2_block_signals(&oldset);
707
708         err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
709                                       OCFS2_JOURNAL_ACCESS_WRITE);
710         if (err < 0) {
711                 mlog_errno(err);
712                 goto out_commit;
713         }
714
715         inc_nlink(inode);
716         inode->i_ctime = CURRENT_TIME;
717         ocfs2_set_links_count(fe, inode->i_nlink);
718         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
719         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
720         ocfs2_journal_dirty(handle, fe_bh);
721
722         err = ocfs2_add_entry(handle, dentry, inode,
723                               OCFS2_I(inode)->ip_blkno,
724                               parent_fe_bh, &lookup);
725         if (err) {
726                 ocfs2_add_links_count(fe, -1);
727                 drop_nlink(inode);
728                 mlog_errno(err);
729                 goto out_commit;
730         }
731
732         err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
733         if (err) {
734                 mlog_errno(err);
735                 goto out_commit;
736         }
737
738         ihold(inode);
739         d_instantiate(dentry, inode);
740
741 out_commit:
742         ocfs2_commit_trans(osb, handle);
743         ocfs2_unblock_signals(&oldset);
744 out_unlock_inode:
745         ocfs2_inode_unlock(inode, 1);
746
747 out:
748         ocfs2_inode_unlock(dir, 1);
749
750         brelse(fe_bh);
751         brelse(parent_fe_bh);
752
753         ocfs2_free_dir_lookup_result(&lookup);
754
755         if (err)
756                 mlog_errno(err);
757
758         return err;
759 }
760
761 /*
762  * Takes and drops an exclusive lock on the given dentry. This will
763  * force other nodes to drop it.
764  */
765 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
766 {
767         int ret;
768
769         ret = ocfs2_dentry_lock(dentry, 1);
770         if (ret)
771                 mlog_errno(ret);
772         else
773                 ocfs2_dentry_unlock(dentry, 1);
774
775         return ret;
776 }
777
778 static inline int inode_is_unlinkable(struct inode *inode)
779 {
780         if (S_ISDIR(inode->i_mode)) {
781                 if (inode->i_nlink == 2)
782                         return 1;
783                 return 0;
784         }
785
786         if (inode->i_nlink == 1)
787                 return 1;
788         return 0;
789 }
790
791 static int ocfs2_unlink(struct inode *dir,
792                         struct dentry *dentry)
793 {
794         int status;
795         int child_locked = 0;
796         struct inode *inode = dentry->d_inode;
797         struct inode *orphan_dir = NULL;
798         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
799         u64 blkno;
800         struct ocfs2_dinode *fe = NULL;
801         struct buffer_head *fe_bh = NULL;
802         struct buffer_head *parent_node_bh = NULL;
803         handle_t *handle = NULL;
804         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
805         struct ocfs2_dir_lookup_result lookup = { NULL, };
806         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
807
808         trace_ocfs2_unlink(dir, dentry, dentry->d_name.len,
809                            dentry->d_name.name,
810                            (unsigned long long)OCFS2_I(dir)->ip_blkno,
811                            (unsigned long long)OCFS2_I(inode)->ip_blkno);
812
813         dquot_initialize(dir);
814
815         BUG_ON(dentry->d_parent->d_inode != dir);
816
817         if (inode == osb->root_inode)
818                 return -EPERM;
819
820         status = ocfs2_inode_lock_nested(dir, &parent_node_bh, 1,
821                                          OI_LS_PARENT);
822         if (status < 0) {
823                 if (status != -ENOENT)
824                         mlog_errno(status);
825                 return status;
826         }
827
828         status = ocfs2_find_files_on_disk(dentry->d_name.name,
829                                           dentry->d_name.len, &blkno, dir,
830                                           &lookup);
831         if (status < 0) {
832                 if (status != -ENOENT)
833                         mlog_errno(status);
834                 goto leave;
835         }
836
837         if (OCFS2_I(inode)->ip_blkno != blkno) {
838                 status = -ENOENT;
839
840                 trace_ocfs2_unlink_noent(
841                                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
842                                 (unsigned long long)blkno,
843                                 OCFS2_I(inode)->ip_flags);
844                 goto leave;
845         }
846
847         status = ocfs2_inode_lock(inode, &fe_bh, 1);
848         if (status < 0) {
849                 if (status != -ENOENT)
850                         mlog_errno(status);
851                 goto leave;
852         }
853         child_locked = 1;
854
855         if (S_ISDIR(inode->i_mode)) {
856                 if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
857                         status = -ENOTEMPTY;
858                         goto leave;
859                 }
860         }
861
862         status = ocfs2_remote_dentry_delete(dentry);
863         if (status < 0) {
864                 /* This remote delete should succeed under all normal
865                  * circumstances. */
866                 mlog_errno(status);
867                 goto leave;
868         }
869
870         if (inode_is_unlinkable(inode)) {
871                 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
872                                                   OCFS2_I(inode)->ip_blkno,
873                                                   orphan_name, &orphan_insert);
874                 if (status < 0) {
875                         mlog_errno(status);
876                         goto leave;
877                 }
878         }
879
880         handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb));
881         if (IS_ERR(handle)) {
882                 status = PTR_ERR(handle);
883                 handle = NULL;
884                 mlog_errno(status);
885                 goto leave;
886         }
887
888         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
889                                          OCFS2_JOURNAL_ACCESS_WRITE);
890         if (status < 0) {
891                 mlog_errno(status);
892                 goto leave;
893         }
894
895         fe = (struct ocfs2_dinode *) fe_bh->b_data;
896
897         if (inode_is_unlinkable(inode)) {
898                 status = ocfs2_orphan_add(osb, handle, inode, fe_bh, orphan_name,
899                                           &orphan_insert, orphan_dir);
900                 if (status < 0) {
901                         mlog_errno(status);
902                         goto leave;
903                 }
904         }
905
906         /* delete the name from the parent dir */
907         status = ocfs2_delete_entry(handle, dir, &lookup);
908         if (status < 0) {
909                 mlog_errno(status);
910                 goto leave;
911         }
912
913         if (S_ISDIR(inode->i_mode))
914                 drop_nlink(inode);
915         drop_nlink(inode);
916         ocfs2_set_links_count(fe, inode->i_nlink);
917         ocfs2_journal_dirty(handle, fe_bh);
918
919         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
920         if (S_ISDIR(inode->i_mode))
921                 drop_nlink(dir);
922
923         status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
924         if (status < 0) {
925                 mlog_errno(status);
926                 if (S_ISDIR(inode->i_mode))
927                         inc_nlink(dir);
928         }
929
930 leave:
931         if (handle)
932                 ocfs2_commit_trans(osb, handle);
933
934         if (child_locked)
935                 ocfs2_inode_unlock(inode, 1);
936
937         ocfs2_inode_unlock(dir, 1);
938
939         if (orphan_dir) {
940                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
941                 ocfs2_inode_unlock(orphan_dir, 1);
942                 mutex_unlock(&orphan_dir->i_mutex);
943                 iput(orphan_dir);
944         }
945
946         brelse(fe_bh);
947         brelse(parent_node_bh);
948
949         ocfs2_free_dir_lookup_result(&orphan_insert);
950         ocfs2_free_dir_lookup_result(&lookup);
951
952         if (status)
953                 mlog_errno(status);
954
955         return status;
956 }
957
958 /*
959  * The only place this should be used is rename!
960  * if they have the same id, then the 1st one is the only one locked.
961  */
962 static int ocfs2_double_lock(struct ocfs2_super *osb,
963                              struct buffer_head **bh1,
964                              struct inode *inode1,
965                              struct buffer_head **bh2,
966                              struct inode *inode2)
967 {
968         int status;
969         struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
970         struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
971         struct buffer_head **tmpbh;
972         struct inode *tmpinode;
973
974         trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno,
975                                 (unsigned long long)oi2->ip_blkno);
976
977         if (*bh1)
978                 *bh1 = NULL;
979         if (*bh2)
980                 *bh2 = NULL;
981
982         /* we always want to lock the one with the lower lockid first. */
983         if (oi1->ip_blkno != oi2->ip_blkno) {
984                 if (oi1->ip_blkno < oi2->ip_blkno) {
985                         /* switch id1 and id2 around */
986                         tmpbh = bh2;
987                         bh2 = bh1;
988                         bh1 = tmpbh;
989
990                         tmpinode = inode2;
991                         inode2 = inode1;
992                         inode1 = tmpinode;
993                 }
994                 /* lock id2 */
995                 status = ocfs2_inode_lock_nested(inode2, bh2, 1,
996                                                  OI_LS_RENAME1);
997                 if (status < 0) {
998                         if (status != -ENOENT)
999                                 mlog_errno(status);
1000                         goto bail;
1001                 }
1002         }
1003
1004         /* lock id1 */
1005         status = ocfs2_inode_lock_nested(inode1, bh1, 1, OI_LS_RENAME2);
1006         if (status < 0) {
1007                 /*
1008                  * An error return must mean that no cluster locks
1009                  * were held on function exit.
1010                  */
1011                 if (oi1->ip_blkno != oi2->ip_blkno) {
1012                         ocfs2_inode_unlock(inode2, 1);
1013                         brelse(*bh2);
1014                         *bh2 = NULL;
1015                 }
1016
1017                 if (status != -ENOENT)
1018                         mlog_errno(status);
1019         }
1020
1021         trace_ocfs2_double_lock_end(
1022                         (unsigned long long)OCFS2_I(inode1)->ip_blkno,
1023                         (unsigned long long)OCFS2_I(inode2)->ip_blkno);
1024
1025 bail:
1026         if (status)
1027                 mlog_errno(status);
1028         return status;
1029 }
1030
1031 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1032 {
1033         ocfs2_inode_unlock(inode1, 1);
1034
1035         if (inode1 != inode2)
1036                 ocfs2_inode_unlock(inode2, 1);
1037 }
1038
1039 static int ocfs2_rename(struct inode *old_dir,
1040                         struct dentry *old_dentry,
1041                         struct inode *new_dir,
1042                         struct dentry *new_dentry)
1043 {
1044         int status = 0, rename_lock = 0, parents_locked = 0, target_exists = 0;
1045         int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 0;
1046         struct inode *old_inode = old_dentry->d_inode;
1047         struct inode *new_inode = new_dentry->d_inode;
1048         struct inode *orphan_dir = NULL;
1049         struct ocfs2_dinode *newfe = NULL;
1050         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1051         struct buffer_head *newfe_bh = NULL;
1052         struct buffer_head *old_inode_bh = NULL;
1053         struct ocfs2_super *osb = NULL;
1054         u64 newfe_blkno, old_de_ino;
1055         handle_t *handle = NULL;
1056         struct buffer_head *old_dir_bh = NULL;
1057         struct buffer_head *new_dir_bh = NULL;
1058         nlink_t old_dir_nlink = old_dir->i_nlink;
1059         struct ocfs2_dinode *old_di;
1060         struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
1061         struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
1062         struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
1063         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
1064         struct ocfs2_dir_lookup_result target_insert = { NULL, };
1065
1066         /* At some point it might be nice to break this function up a
1067          * bit. */
1068
1069         trace_ocfs2_rename(old_dir, old_dentry, new_dir, new_dentry,
1070                            old_dentry->d_name.len, old_dentry->d_name.name,
1071                            new_dentry->d_name.len, new_dentry->d_name.name);
1072
1073         dquot_initialize(old_dir);
1074         dquot_initialize(new_dir);
1075
1076         osb = OCFS2_SB(old_dir->i_sb);
1077
1078         if (new_inode) {
1079                 if (!igrab(new_inode))
1080                         BUG();
1081         }
1082
1083         /* Assume a directory hierarchy thusly:
1084          * a/b/c
1085          * a/d
1086          * a,b,c, and d are all directories.
1087          *
1088          * from cwd of 'a' on both nodes:
1089          * node1: mv b/c d
1090          * node2: mv d   b/c
1091          *
1092          * And that's why, just like the VFS, we need a file system
1093          * rename lock. */
1094         if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
1095                 status = ocfs2_rename_lock(osb);
1096                 if (status < 0) {
1097                         mlog_errno(status);
1098                         goto bail;
1099                 }
1100                 rename_lock = 1;
1101         }
1102
1103         /* if old and new are the same, this'll just do one lock. */
1104         status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1105                                    &new_dir_bh, new_dir);
1106         if (status < 0) {
1107                 mlog_errno(status);
1108                 goto bail;
1109         }
1110         parents_locked = 1;
1111
1112         /* make sure both dirs have bhs
1113          * get an extra ref on old_dir_bh if old==new */
1114         if (!new_dir_bh) {
1115                 if (old_dir_bh) {
1116                         new_dir_bh = old_dir_bh;
1117                         get_bh(new_dir_bh);
1118                 } else {
1119                         mlog(ML_ERROR, "no old_dir_bh!\n");
1120                         status = -EIO;
1121                         goto bail;
1122                 }
1123         }
1124
1125         /*
1126          * Aside from allowing a meta data update, the locking here
1127          * also ensures that the downconvert thread on other nodes
1128          * won't have to concurrently downconvert the inode and the
1129          * dentry locks.
1130          */
1131         status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
1132                                          OI_LS_PARENT);
1133         if (status < 0) {
1134                 if (status != -ENOENT)
1135                         mlog_errno(status);
1136                 goto bail;
1137         }
1138         old_child_locked = 1;
1139
1140         status = ocfs2_remote_dentry_delete(old_dentry);
1141         if (status < 0) {
1142                 mlog_errno(status);
1143                 goto bail;
1144         }
1145
1146         if (S_ISDIR(old_inode->i_mode)) {
1147                 u64 old_inode_parent;
1148
1149                 update_dot_dot = 1;
1150                 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1151                                                   old_inode,
1152                                                   &old_inode_dot_dot_res);
1153                 if (status) {
1154                         status = -EIO;
1155                         goto bail;
1156                 }
1157
1158                 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1159                         status = -EIO;
1160                         goto bail;
1161                 }
1162
1163                 if (!new_inode && new_dir != old_dir &&
1164                     new_dir->i_nlink >= ocfs2_link_max(osb)) {
1165                         status = -EMLINK;
1166                         goto bail;
1167                 }
1168         }
1169
1170         status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1171                                             old_dentry->d_name.len,
1172                                             &old_de_ino);
1173         if (status) {
1174                 status = -ENOENT;
1175                 goto bail;
1176         }
1177
1178         /*
1179          *  Check for inode number is _not_ due to possible IO errors.
1180          *  We might rmdir the source, keep it as pwd of some process
1181          *  and merrily kill the link to whatever was created under the
1182          *  same name. Goodbye sticky bit ;-<
1183          */
1184         if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1185                 status = -ENOENT;
1186                 goto bail;
1187         }
1188
1189         /* check if the target already exists (in which case we need
1190          * to delete it */
1191         status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1192                                           new_dentry->d_name.len,
1193                                           &newfe_blkno, new_dir,
1194                                           &target_lookup_res);
1195         /* The only error we allow here is -ENOENT because the new
1196          * file not existing is perfectly valid. */
1197         if ((status < 0) && (status != -ENOENT)) {
1198                 /* If we cannot find the file specified we should just */
1199                 /* return the error... */
1200                 mlog_errno(status);
1201                 goto bail;
1202         }
1203         if (status == 0)
1204                 target_exists = 1;
1205
1206         if (!target_exists && new_inode) {
1207                 /*
1208                  * Target was unlinked by another node while we were
1209                  * waiting to get to ocfs2_rename(). There isn't
1210                  * anything we can do here to help the situation, so
1211                  * bubble up the appropriate error.
1212                  */
1213                 status = -ENOENT;
1214                 goto bail;
1215         }
1216
1217         /* In case we need to overwrite an existing file, we blow it
1218          * away first */
1219         if (target_exists) {
1220                 /* VFS didn't think there existed an inode here, but
1221                  * someone else in the cluster must have raced our
1222                  * rename to create one. Today we error cleanly, in
1223                  * the future we should consider calling iget to build
1224                  * a new struct inode for this entry. */
1225                 if (!new_inode) {
1226                         status = -EACCES;
1227
1228                         trace_ocfs2_rename_target_exists(new_dentry->d_name.len,
1229                                                 new_dentry->d_name.name);
1230                         goto bail;
1231                 }
1232
1233                 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1234                         status = -EACCES;
1235
1236                         trace_ocfs2_rename_disagree(
1237                              (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1238                              (unsigned long long)newfe_blkno,
1239                              OCFS2_I(new_inode)->ip_flags);
1240                         goto bail;
1241                 }
1242
1243                 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1244                 if (status < 0) {
1245                         if (status != -ENOENT)
1246                                 mlog_errno(status);
1247                         goto bail;
1248                 }
1249                 new_child_locked = 1;
1250
1251                 status = ocfs2_remote_dentry_delete(new_dentry);
1252                 if (status < 0) {
1253                         mlog_errno(status);
1254                         goto bail;
1255                 }
1256
1257                 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1258
1259                 trace_ocfs2_rename_over_existing(
1260                      (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1261                      (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1262
1263                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1264                         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1265                                                 OCFS2_I(new_inode)->ip_blkno,
1266                                                 orphan_name, &orphan_insert);
1267                         if (status < 0) {
1268                                 mlog_errno(status);
1269                                 goto bail;
1270                         }
1271                 }
1272         } else {
1273                 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1274
1275                 status = ocfs2_check_dir_for_entry(new_dir,
1276                                                    new_dentry->d_name.name,
1277                                                    new_dentry->d_name.len);
1278                 if (status)
1279                         goto bail;
1280
1281                 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1282                                                       new_dentry->d_name.name,
1283                                                       new_dentry->d_name.len,
1284                                                       &target_insert);
1285                 if (status < 0) {
1286                         mlog_errno(status);
1287                         goto bail;
1288                 }
1289         }
1290
1291         handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
1292         if (IS_ERR(handle)) {
1293                 status = PTR_ERR(handle);
1294                 handle = NULL;
1295                 mlog_errno(status);
1296                 goto bail;
1297         }
1298
1299         if (target_exists) {
1300                 if (S_ISDIR(new_inode->i_mode)) {
1301                         if (new_inode->i_nlink != 2 ||
1302                             !ocfs2_empty_dir(new_inode)) {
1303                                 status = -ENOTEMPTY;
1304                                 goto bail;
1305                         }
1306                 }
1307                 status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
1308                                                  newfe_bh,
1309                                                  OCFS2_JOURNAL_ACCESS_WRITE);
1310                 if (status < 0) {
1311                         mlog_errno(status);
1312                         goto bail;
1313                 }
1314
1315                 if (S_ISDIR(new_inode->i_mode) ||
1316                     (ocfs2_read_links_count(newfe) == 1)) {
1317                         status = ocfs2_orphan_add(osb, handle, new_inode,
1318                                                   newfe_bh, orphan_name,
1319                                                   &orphan_insert, orphan_dir);
1320                         if (status < 0) {
1321                                 mlog_errno(status);
1322                                 goto bail;
1323                         }
1324                 }
1325
1326                 /* change the dirent to point to the correct inode */
1327                 status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
1328                                             old_inode);
1329                 if (status < 0) {
1330                         mlog_errno(status);
1331                         goto bail;
1332                 }
1333                 new_dir->i_version++;
1334
1335                 if (S_ISDIR(new_inode->i_mode))
1336                         ocfs2_set_links_count(newfe, 0);
1337                 else
1338                         ocfs2_add_links_count(newfe, -1);
1339                 ocfs2_journal_dirty(handle, newfe_bh);
1340         } else {
1341                 /* if the name was not found in new_dir, add it now */
1342                 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1343                                          OCFS2_I(old_inode)->ip_blkno,
1344                                          new_dir_bh, &target_insert);
1345         }
1346
1347         old_inode->i_ctime = CURRENT_TIME;
1348         mark_inode_dirty(old_inode);
1349
1350         status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode),
1351                                          old_inode_bh,
1352                                          OCFS2_JOURNAL_ACCESS_WRITE);
1353         if (status >= 0) {
1354                 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1355
1356                 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1357                 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1358                 ocfs2_journal_dirty(handle, old_inode_bh);
1359         } else
1360                 mlog_errno(status);
1361
1362         /*
1363          * Now that the name has been added to new_dir, remove the old name.
1364          *
1365          * We don't keep any directory entry context around until now
1366          * because the insert might have changed the type of directory
1367          * we're dealing with.
1368          */
1369         status = ocfs2_find_entry(old_dentry->d_name.name,
1370                                   old_dentry->d_name.len, old_dir,
1371                                   &old_entry_lookup);
1372         if (status)
1373                 goto bail;
1374
1375         status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
1376         if (status < 0) {
1377                 mlog_errno(status);
1378                 goto bail;
1379         }
1380
1381         if (new_inode) {
1382                 new_inode->i_nlink--;
1383                 new_inode->i_ctime = CURRENT_TIME;
1384         }
1385         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1386
1387         if (update_dot_dot) {
1388                 status = ocfs2_update_entry(old_inode, handle,
1389                                             &old_inode_dot_dot_res, new_dir);
1390                 old_dir->i_nlink--;
1391                 if (new_inode) {
1392                         new_inode->i_nlink--;
1393                 } else {
1394                         inc_nlink(new_dir);
1395                         mark_inode_dirty(new_dir);
1396                 }
1397         }
1398         mark_inode_dirty(old_dir);
1399         ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1400         if (new_inode) {
1401                 mark_inode_dirty(new_inode);
1402                 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1403         }
1404
1405         if (old_dir != new_dir) {
1406                 /* Keep the same times on both directories.*/
1407                 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1408
1409                 /*
1410                  * This will also pick up the i_nlink change from the
1411                  * block above.
1412                  */
1413                 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1414         }
1415
1416         if (old_dir_nlink != old_dir->i_nlink) {
1417                 if (!old_dir_bh) {
1418                         mlog(ML_ERROR, "need to change nlink for old dir "
1419                              "%llu from %d to %d but bh is NULL!\n",
1420                              (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1421                              (int)old_dir_nlink, old_dir->i_nlink);
1422                 } else {
1423                         struct ocfs2_dinode *fe;
1424                         status = ocfs2_journal_access_di(handle,
1425                                                          INODE_CACHE(old_dir),
1426                                                          old_dir_bh,
1427                                                          OCFS2_JOURNAL_ACCESS_WRITE);
1428                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1429                         ocfs2_set_links_count(fe, old_dir->i_nlink);
1430                         ocfs2_journal_dirty(handle, old_dir_bh);
1431                 }
1432         }
1433         ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1434         status = 0;
1435 bail:
1436         if (rename_lock)
1437                 ocfs2_rename_unlock(osb);
1438
1439         if (handle)
1440                 ocfs2_commit_trans(osb, handle);
1441
1442         if (parents_locked)
1443                 ocfs2_double_unlock(old_dir, new_dir);
1444
1445         if (old_child_locked)
1446                 ocfs2_inode_unlock(old_inode, 1);
1447
1448         if (new_child_locked)
1449                 ocfs2_inode_unlock(new_inode, 1);
1450
1451         if (orphan_dir) {
1452                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1453                 ocfs2_inode_unlock(orphan_dir, 1);
1454                 mutex_unlock(&orphan_dir->i_mutex);
1455                 iput(orphan_dir);
1456         }
1457
1458         if (new_inode)
1459                 sync_mapping_buffers(old_inode->i_mapping);
1460
1461         if (new_inode)
1462                 iput(new_inode);
1463
1464         ocfs2_free_dir_lookup_result(&target_lookup_res);
1465         ocfs2_free_dir_lookup_result(&old_entry_lookup);
1466         ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
1467         ocfs2_free_dir_lookup_result(&orphan_insert);
1468         ocfs2_free_dir_lookup_result(&target_insert);
1469
1470         brelse(newfe_bh);
1471         brelse(old_inode_bh);
1472         brelse(old_dir_bh);
1473         brelse(new_dir_bh);
1474
1475         if (status)
1476                 mlog_errno(status);
1477
1478         return status;
1479 }
1480
1481 /*
1482  * we expect i_size = strlen(symname). Copy symname into the file
1483  * data, including the null terminator.
1484  */
1485 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1486                                      handle_t *handle,
1487                                      struct inode *inode,
1488                                      const char *symname)
1489 {
1490         struct buffer_head **bhs = NULL;
1491         const char *c;
1492         struct super_block *sb = osb->sb;
1493         u64 p_blkno, p_blocks;
1494         int virtual, blocks, status, i, bytes_left;
1495
1496         bytes_left = i_size_read(inode) + 1;
1497         /* we can't trust i_blocks because we're actually going to
1498          * write i_size + 1 bytes. */
1499         blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1500
1501         trace_ocfs2_create_symlink_data((unsigned long long)inode->i_blocks,
1502                                         i_size_read(inode), blocks);
1503
1504         /* Sanity check -- make sure we're going to fit. */
1505         if (bytes_left >
1506             ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1507                 status = -EIO;
1508                 mlog_errno(status);
1509                 goto bail;
1510         }
1511
1512         bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1513         if (!bhs) {
1514                 status = -ENOMEM;
1515                 mlog_errno(status);
1516                 goto bail;
1517         }
1518
1519         status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1520                                              NULL);
1521         if (status < 0) {
1522                 mlog_errno(status);
1523                 goto bail;
1524         }
1525
1526         /* links can never be larger than one cluster so we know this
1527          * is all going to be contiguous, but do a sanity check
1528          * anyway. */
1529         if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1530                 status = -EIO;
1531                 mlog_errno(status);
1532                 goto bail;
1533         }
1534
1535         virtual = 0;
1536         while(bytes_left > 0) {
1537                 c = &symname[virtual * sb->s_blocksize];
1538
1539                 bhs[virtual] = sb_getblk(sb, p_blkno);
1540                 if (!bhs[virtual]) {
1541                         status = -ENOMEM;
1542                         mlog_errno(status);
1543                         goto bail;
1544                 }
1545                 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode),
1546                                               bhs[virtual]);
1547
1548                 status = ocfs2_journal_access(handle, INODE_CACHE(inode),
1549                                               bhs[virtual],
1550                                               OCFS2_JOURNAL_ACCESS_CREATE);
1551                 if (status < 0) {
1552                         mlog_errno(status);
1553                         goto bail;
1554                 }
1555
1556                 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1557
1558                 memcpy(bhs[virtual]->b_data, c,
1559                        (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1560                        bytes_left);
1561
1562                 ocfs2_journal_dirty(handle, bhs[virtual]);
1563
1564                 virtual++;
1565                 p_blkno++;
1566                 bytes_left -= sb->s_blocksize;
1567         }
1568
1569         status = 0;
1570 bail:
1571
1572         if (bhs) {
1573                 for(i = 0; i < blocks; i++)
1574                         brelse(bhs[i]);
1575                 kfree(bhs);
1576         }
1577
1578         if (status)
1579                 mlog_errno(status);
1580         return status;
1581 }
1582
1583 static int ocfs2_symlink(struct inode *dir,
1584                          struct dentry *dentry,
1585                          const char *symname)
1586 {
1587         int status, l, credits;
1588         u64 newsize;
1589         struct ocfs2_super *osb = NULL;
1590         struct inode *inode = NULL;
1591         struct super_block *sb;
1592         struct buffer_head *new_fe_bh = NULL;
1593         struct buffer_head *parent_fe_bh = NULL;
1594         struct ocfs2_dinode *fe = NULL;
1595         struct ocfs2_dinode *dirfe;
1596         handle_t *handle = NULL;
1597         struct ocfs2_alloc_context *inode_ac = NULL;
1598         struct ocfs2_alloc_context *data_ac = NULL;
1599         struct ocfs2_alloc_context *xattr_ac = NULL;
1600         int want_clusters = 0;
1601         int xattr_credits = 0;
1602         struct ocfs2_security_xattr_info si = {
1603                 .enable = 1,
1604         };
1605         int did_quota = 0, did_quota_inode = 0;
1606         struct ocfs2_dir_lookup_result lookup = { NULL, };
1607         sigset_t oldset;
1608         int did_block_signals = 0;
1609
1610         trace_ocfs2_symlink_begin(dir, dentry, symname,
1611                                   dentry->d_name.len, dentry->d_name.name);
1612
1613         dquot_initialize(dir);
1614
1615         sb = dir->i_sb;
1616         osb = OCFS2_SB(sb);
1617
1618         l = strlen(symname) + 1;
1619
1620         credits = ocfs2_calc_symlink_credits(sb);
1621
1622         /* lock the parent directory */
1623         status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1624         if (status < 0) {
1625                 if (status != -ENOENT)
1626                         mlog_errno(status);
1627                 return status;
1628         }
1629
1630         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1631         if (!ocfs2_read_links_count(dirfe)) {
1632                 /* can't make a file in a deleted directory. */
1633                 status = -ENOENT;
1634                 goto bail;
1635         }
1636
1637         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1638                                            dentry->d_name.len);
1639         if (status)
1640                 goto bail;
1641
1642         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1643                                               dentry->d_name.name,
1644                                               dentry->d_name.len, &lookup);
1645         if (status < 0) {
1646                 mlog_errno(status);
1647                 goto bail;
1648         }
1649
1650         status = ocfs2_reserve_new_inode(osb, &inode_ac);
1651         if (status < 0) {
1652                 if (status != -ENOSPC)
1653                         mlog_errno(status);
1654                 goto bail;
1655         }
1656
1657         inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
1658         if (!inode) {
1659                 status = -ENOMEM;
1660                 mlog_errno(status);
1661                 goto bail;
1662         }
1663
1664         /* get security xattr */
1665         status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
1666         if (status) {
1667                 if (status == -EOPNOTSUPP)
1668                         si.enable = 0;
1669                 else {
1670                         mlog_errno(status);
1671                         goto bail;
1672                 }
1673         }
1674
1675         /* calculate meta data/clusters for setting security xattr */
1676         if (si.enable) {
1677                 status = ocfs2_calc_security_init(dir, &si, &want_clusters,
1678                                                   &xattr_credits, &xattr_ac);
1679                 if (status < 0) {
1680                         mlog_errno(status);
1681                         goto bail;
1682                 }
1683         }
1684
1685         /* don't reserve bitmap space for fast symlinks. */
1686         if (l > ocfs2_fast_symlink_chars(sb))
1687                 want_clusters += 1;
1688
1689         status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
1690         if (status < 0) {
1691                 if (status != -ENOSPC)
1692                         mlog_errno(status);
1693                 goto bail;
1694         }
1695
1696         handle = ocfs2_start_trans(osb, credits + xattr_credits);
1697         if (IS_ERR(handle)) {
1698                 status = PTR_ERR(handle);
1699                 handle = NULL;
1700                 mlog_errno(status);
1701                 goto bail;
1702         }
1703
1704         /* Starting to change things, restart is no longer possible. */
1705         ocfs2_block_signals(&oldset);
1706         did_block_signals = 1;
1707
1708         status = dquot_alloc_inode(inode);
1709         if (status)
1710                 goto bail;
1711         did_quota_inode = 1;
1712
1713         trace_ocfs2_symlink_create(dir, dentry, dentry->d_name.len,
1714                                    dentry->d_name.name,
1715                                    (unsigned long long)OCFS2_I(dir)->ip_blkno,
1716                                    inode->i_mode);
1717
1718         status = ocfs2_mknod_locked(osb, dir, inode,
1719                                     0, &new_fe_bh, parent_fe_bh, handle,
1720                                     inode_ac);
1721         if (status < 0) {
1722                 mlog_errno(status);
1723                 goto bail;
1724         }
1725
1726         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1727         inode->i_rdev = 0;
1728         newsize = l - 1;
1729         if (l > ocfs2_fast_symlink_chars(sb)) {
1730                 u32 offset = 0;
1731
1732                 inode->i_op = &ocfs2_symlink_inode_operations;
1733                 status = dquot_alloc_space_nodirty(inode,
1734                     ocfs2_clusters_to_bytes(osb->sb, 1));
1735                 if (status)
1736                         goto bail;
1737                 did_quota = 1;
1738                 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
1739                                               new_fe_bh,
1740                                               handle, data_ac, NULL,
1741                                               NULL);
1742                 if (status < 0) {
1743                         if (status != -ENOSPC && status != -EINTR) {
1744                                 mlog(ML_ERROR,
1745                                      "Failed to extend file to %llu\n",
1746                                      (unsigned long long)newsize);
1747                                 mlog_errno(status);
1748                                 status = -ENOSPC;
1749                         }
1750                         goto bail;
1751                 }
1752                 i_size_write(inode, newsize);
1753                 inode->i_blocks = ocfs2_inode_sector_count(inode);
1754         } else {
1755                 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1756                 memcpy((char *) fe->id2.i_symlink, symname, l);
1757                 i_size_write(inode, newsize);
1758                 inode->i_blocks = 0;
1759         }
1760
1761         status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1762         if (status < 0) {
1763                 mlog_errno(status);
1764                 goto bail;
1765         }
1766
1767         if (!ocfs2_inode_is_fast_symlink(inode)) {
1768                 status = ocfs2_create_symlink_data(osb, handle, inode,
1769                                                    symname);
1770                 if (status < 0) {
1771                         mlog_errno(status);
1772                         goto bail;
1773                 }
1774         }
1775
1776         if (si.enable) {
1777                 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
1778                                                  xattr_ac, data_ac);
1779                 if (status < 0) {
1780                         mlog_errno(status);
1781                         goto bail;
1782                 }
1783         }
1784
1785         /*
1786          * Do this before adding the entry to the directory. We add
1787          * also set d_op after success so that ->d_iput() will cleanup
1788          * the dentry lock even if ocfs2_add_entry() fails below.
1789          */
1790         status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1791         if (status) {
1792                 mlog_errno(status);
1793                 goto bail;
1794         }
1795
1796         status = ocfs2_add_entry(handle, dentry, inode,
1797                                  le64_to_cpu(fe->i_blkno), parent_fe_bh,
1798                                  &lookup);
1799         if (status < 0) {
1800                 mlog_errno(status);
1801                 goto bail;
1802         }
1803
1804         insert_inode_hash(inode);
1805         d_instantiate(dentry, inode);
1806 bail:
1807         if (status < 0 && did_quota)
1808                 dquot_free_space_nodirty(inode,
1809                                         ocfs2_clusters_to_bytes(osb->sb, 1));
1810         if (status < 0 && did_quota_inode)
1811                 dquot_free_inode(inode);
1812         if (handle)
1813                 ocfs2_commit_trans(osb, handle);
1814
1815         ocfs2_inode_unlock(dir, 1);
1816         if (did_block_signals)
1817                 ocfs2_unblock_signals(&oldset);
1818
1819         brelse(new_fe_bh);
1820         brelse(parent_fe_bh);
1821         kfree(si.name);
1822         kfree(si.value);
1823         ocfs2_free_dir_lookup_result(&lookup);
1824         if (inode_ac)
1825                 ocfs2_free_alloc_context(inode_ac);
1826         if (data_ac)
1827                 ocfs2_free_alloc_context(data_ac);
1828         if (xattr_ac)
1829                 ocfs2_free_alloc_context(xattr_ac);
1830         if ((status < 0) && inode) {
1831                 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
1832                 clear_nlink(inode);
1833                 iput(inode);
1834         }
1835
1836         if (status)
1837                 mlog_errno(status);
1838
1839         return status;
1840 }
1841
1842 static int ocfs2_blkno_stringify(u64 blkno, char *name)
1843 {
1844         int status, namelen;
1845
1846         namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1847                            (long long)blkno);
1848         if (namelen <= 0) {
1849                 if (namelen)
1850                         status = namelen;
1851                 else
1852                         status = -EINVAL;
1853                 mlog_errno(status);
1854                 goto bail;
1855         }
1856         if (namelen != OCFS2_ORPHAN_NAMELEN) {
1857                 status = -EINVAL;
1858                 mlog_errno(status);
1859                 goto bail;
1860         }
1861
1862         trace_ocfs2_blkno_stringify(blkno, name, namelen);
1863
1864         status = 0;
1865 bail:
1866         if (status < 0)
1867                 mlog_errno(status);
1868         return status;
1869 }
1870
1871 static int ocfs2_lookup_lock_orphan_dir(struct ocfs2_super *osb,
1872                                         struct inode **ret_orphan_dir,
1873                                         struct buffer_head **ret_orphan_dir_bh)
1874 {
1875         struct inode *orphan_dir_inode;
1876         struct buffer_head *orphan_dir_bh = NULL;
1877         int ret = 0;
1878
1879         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
1880                                                        ORPHAN_DIR_SYSTEM_INODE,
1881                                                        osb->slot_num);
1882         if (!orphan_dir_inode) {
1883                 ret = -ENOENT;
1884                 mlog_errno(ret);
1885                 return ret;
1886         }
1887
1888         mutex_lock(&orphan_dir_inode->i_mutex);
1889
1890         ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
1891         if (ret < 0) {
1892                 mutex_unlock(&orphan_dir_inode->i_mutex);
1893                 iput(orphan_dir_inode);
1894
1895                 mlog_errno(ret);
1896                 return ret;
1897         }
1898
1899         *ret_orphan_dir = orphan_dir_inode;
1900         *ret_orphan_dir_bh = orphan_dir_bh;
1901
1902         return 0;
1903 }
1904
1905 static int __ocfs2_prepare_orphan_dir(struct inode *orphan_dir_inode,
1906                                       struct buffer_head *orphan_dir_bh,
1907                                       u64 blkno,
1908                                       char *name,
1909                                       struct ocfs2_dir_lookup_result *lookup)
1910 {
1911         int ret;
1912         struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);
1913
1914         ret = ocfs2_blkno_stringify(blkno, name);
1915         if (ret < 0) {
1916                 mlog_errno(ret);
1917                 return ret;
1918         }
1919
1920         ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
1921                                            orphan_dir_bh, name,
1922                                            OCFS2_ORPHAN_NAMELEN, lookup);
1923         if (ret < 0) {
1924                 mlog_errno(ret);
1925                 return ret;
1926         }
1927
1928         return 0;
1929 }
1930
1931 /**
1932  * ocfs2_prepare_orphan_dir() - Prepare an orphan directory for
1933  * insertion of an orphan.
1934  * @osb: ocfs2 file system
1935  * @ret_orphan_dir: Orphan dir inode - returned locked!
1936  * @blkno: Actual block number of the inode to be inserted into orphan dir.
1937  * @lookup: dir lookup result, to be passed back into functions like
1938  *          ocfs2_orphan_add
1939  *
1940  * Returns zero on success and the ret_orphan_dir, name and lookup
1941  * fields will be populated.
1942  *
1943  * Returns non-zero on failure. 
1944  */
1945 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
1946                                     struct inode **ret_orphan_dir,
1947                                     u64 blkno,
1948                                     char *name,
1949                                     struct ocfs2_dir_lookup_result *lookup)
1950 {
1951         struct inode *orphan_dir_inode = NULL;
1952         struct buffer_head *orphan_dir_bh = NULL;
1953         int ret = 0;
1954
1955         ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode,
1956                                            &orphan_dir_bh);
1957         if (ret < 0) {
1958                 mlog_errno(ret);
1959                 return ret;
1960         }
1961
1962         ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh,
1963                                          blkno, name, lookup);
1964         if (ret < 0) {
1965                 mlog_errno(ret);
1966                 goto out;
1967         }
1968
1969         *ret_orphan_dir = orphan_dir_inode;
1970
1971 out:
1972         brelse(orphan_dir_bh);
1973
1974         if (ret) {
1975                 ocfs2_inode_unlock(orphan_dir_inode, 1);
1976                 mutex_unlock(&orphan_dir_inode->i_mutex);
1977                 iput(orphan_dir_inode);
1978         }
1979
1980         if (ret)
1981                 mlog_errno(ret);
1982         return ret;
1983 }
1984
1985 static int ocfs2_orphan_add(struct ocfs2_super *osb,
1986                             handle_t *handle,
1987                             struct inode *inode,
1988                             struct buffer_head *fe_bh,
1989                             char *name,
1990                             struct ocfs2_dir_lookup_result *lookup,
1991                             struct inode *orphan_dir_inode)
1992 {
1993         struct buffer_head *orphan_dir_bh = NULL;
1994         int status = 0;
1995         struct ocfs2_dinode *orphan_fe;
1996         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
1997
1998         trace_ocfs2_orphan_add_begin(
1999                                 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2000
2001         status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
2002         if (status < 0) {
2003                 mlog_errno(status);
2004                 goto leave;
2005         }
2006
2007         status = ocfs2_journal_access_di(handle,
2008                                          INODE_CACHE(orphan_dir_inode),
2009                                          orphan_dir_bh,
2010                                          OCFS2_JOURNAL_ACCESS_WRITE);
2011         if (status < 0) {
2012                 mlog_errno(status);
2013                 goto leave;
2014         }
2015
2016         /* we're a cluster, and nlink can change on disk from
2017          * underneath us... */
2018         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2019         if (S_ISDIR(inode->i_mode))
2020                 ocfs2_add_links_count(orphan_fe, 1);
2021         orphan_dir_inode->i_nlink = ocfs2_read_links_count(orphan_fe);
2022         ocfs2_journal_dirty(handle, orphan_dir_bh);
2023
2024         status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2025                                    OCFS2_ORPHAN_NAMELEN, inode,
2026                                    OCFS2_I(inode)->ip_blkno,
2027                                    orphan_dir_bh, lookup);
2028         if (status < 0) {
2029                 mlog_errno(status);
2030                 goto leave;
2031         }
2032
2033         /*
2034          * We're going to journal the change of i_flags and i_orphaned_slot.
2035          * It's safe anyway, though some callers may duplicate the journaling.
2036          * Journaling within the func just make the logic look more
2037          * straightforward.
2038          */
2039         status = ocfs2_journal_access_di(handle,
2040                                          INODE_CACHE(inode),
2041                                          fe_bh,
2042                                          OCFS2_JOURNAL_ACCESS_WRITE);
2043         if (status < 0) {
2044                 mlog_errno(status);
2045                 goto leave;
2046         }
2047
2048         le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2049         OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR;
2050
2051         /* Record which orphan dir our inode now resides
2052          * in. delete_inode will use this to determine which orphan
2053          * dir to lock. */
2054         fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
2055
2056         ocfs2_journal_dirty(handle, fe_bh);
2057
2058         trace_ocfs2_orphan_add_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
2059                                    osb->slot_num);
2060
2061 leave:
2062         brelse(orphan_dir_bh);
2063
2064         if (status)
2065                 mlog_errno(status);
2066         return status;
2067 }
2068
2069 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2070 int ocfs2_orphan_del(struct ocfs2_super *osb,
2071                      handle_t *handle,
2072                      struct inode *orphan_dir_inode,
2073                      struct inode *inode,
2074                      struct buffer_head *orphan_dir_bh)
2075 {
2076         char name[OCFS2_ORPHAN_NAMELEN + 1];
2077         struct ocfs2_dinode *orphan_fe;
2078         int status = 0;
2079         struct ocfs2_dir_lookup_result lookup = { NULL, };
2080
2081         status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2082         if (status < 0) {
2083                 mlog_errno(status);
2084                 goto leave;
2085         }
2086
2087         trace_ocfs2_orphan_del(
2088              (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2089              name, OCFS2_ORPHAN_NAMELEN);
2090
2091         /* find it's spot in the orphan directory */
2092         status = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, orphan_dir_inode,
2093                                   &lookup);
2094         if (status) {
2095                 mlog_errno(status);
2096                 goto leave;
2097         }
2098
2099         /* remove it from the orphan directory */
2100         status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup);
2101         if (status < 0) {
2102                 mlog_errno(status);
2103                 goto leave;
2104         }
2105
2106         status = ocfs2_journal_access_di(handle,
2107                                          INODE_CACHE(orphan_dir_inode),
2108                                          orphan_dir_bh,
2109                                          OCFS2_JOURNAL_ACCESS_WRITE);
2110         if (status < 0) {
2111                 mlog_errno(status);
2112                 goto leave;
2113         }
2114
2115         /* do the i_nlink dance! :) */
2116         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2117         if (S_ISDIR(inode->i_mode))
2118                 ocfs2_add_links_count(orphan_fe, -1);
2119         orphan_dir_inode->i_nlink = ocfs2_read_links_count(orphan_fe);
2120         ocfs2_journal_dirty(handle, orphan_dir_bh);
2121
2122 leave:
2123         ocfs2_free_dir_lookup_result(&lookup);
2124
2125         if (status)
2126                 mlog_errno(status);
2127         return status;
2128 }
2129
2130 /**
2131  * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to recieve a newly
2132  * allocated file. This is different from the typical 'add to orphan dir'
2133  * operation in that the inode does not yet exist. This is a problem because
2134  * the orphan dir stringifies the inode block number to come up with it's
2135  * dirent. Obviously if the inode does not yet exist we have a chicken and egg
2136  * problem. This function works around it by calling deeper into the orphan
2137  * and suballoc code than other callers. Use this only by necessity.
2138  * @dir: The directory which this inode will ultimately wind up under - not the
2139  * orphan dir!
2140  * @dir_bh: buffer_head the @dir inode block
2141  * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled
2142  * with the string to be used for orphan dirent. Pass back to the orphan dir
2143  * code.
2144  * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan
2145  * dir code.
2146  * @ret_di_blkno: block number where the new inode will be allocated.
2147  * @orphan_insert: Dir insert context to be passed back into orphan dir code.
2148  * @ret_inode_ac: Inode alloc context to be passed back to the allocator.
2149  *
2150  * Returns zero on success and the ret_orphan_dir, name and lookup
2151  * fields will be populated.
2152  *
2153  * Returns non-zero on failure. 
2154  */
2155 static int ocfs2_prep_new_orphaned_file(struct inode *dir,
2156                                         struct buffer_head *dir_bh,
2157                                         char *orphan_name,
2158                                         struct inode **ret_orphan_dir,
2159                                         u64 *ret_di_blkno,
2160                                         struct ocfs2_dir_lookup_result *orphan_insert,
2161                                         struct ocfs2_alloc_context **ret_inode_ac)
2162 {
2163         int ret;
2164         u64 di_blkno;
2165         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2166         struct inode *orphan_dir = NULL;
2167         struct buffer_head *orphan_dir_bh = NULL;
2168         struct ocfs2_alloc_context *inode_ac = NULL;
2169
2170         ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh);
2171         if (ret < 0) {
2172                 mlog_errno(ret);
2173                 return ret;
2174         }
2175
2176         /* reserve an inode spot */
2177         ret = ocfs2_reserve_new_inode(osb, &inode_ac);
2178         if (ret < 0) {
2179                 if (ret != -ENOSPC)
2180                         mlog_errno(ret);
2181                 goto out;
2182         }
2183
2184         ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
2185                                        &di_blkno);
2186         if (ret) {
2187                 mlog_errno(ret);
2188                 goto out;
2189         }
2190
2191         ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
2192                                          di_blkno, orphan_name, orphan_insert);
2193         if (ret < 0) {
2194                 mlog_errno(ret);
2195                 goto out;
2196         }
2197
2198 out:
2199         if (ret == 0) {
2200                 *ret_orphan_dir = orphan_dir;
2201                 *ret_di_blkno = di_blkno;
2202                 *ret_inode_ac = inode_ac;
2203                 /*
2204                  * orphan_name and orphan_insert are already up to
2205                  * date via prepare_orphan_dir
2206                  */
2207         } else {
2208                 /* Unroll reserve_new_inode* */
2209                 if (inode_ac)
2210                         ocfs2_free_alloc_context(inode_ac);
2211
2212                 /* Unroll orphan dir locking */
2213                 mutex_unlock(&orphan_dir->i_mutex);
2214                 ocfs2_inode_unlock(orphan_dir, 1);
2215                 iput(orphan_dir);
2216         }
2217
2218         brelse(orphan_dir_bh);
2219
2220         return 0;
2221 }
2222
2223 int ocfs2_create_inode_in_orphan(struct inode *dir,
2224                                  int mode,
2225                                  struct inode **new_inode)
2226 {
2227         int status, did_quota_inode = 0;
2228         struct inode *inode = NULL;
2229         struct inode *orphan_dir = NULL;
2230         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2231         struct ocfs2_dinode *di = NULL;
2232         handle_t *handle = NULL;
2233         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
2234         struct buffer_head *parent_di_bh = NULL;
2235         struct buffer_head *new_di_bh = NULL;
2236         struct ocfs2_alloc_context *inode_ac = NULL;
2237         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2238         u64 uninitialized_var(di_blkno), suballoc_loc;
2239         u16 suballoc_bit;
2240
2241         status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2242         if (status < 0) {
2243                 if (status != -ENOENT)
2244                         mlog_errno(status);
2245                 return status;
2246         }
2247
2248         status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
2249                                               orphan_name, &orphan_dir,
2250                                               &di_blkno, &orphan_insert, &inode_ac);
2251         if (status < 0) {
2252                 if (status != -ENOSPC)
2253                         mlog_errno(status);
2254                 goto leave;
2255         }
2256
2257         inode = ocfs2_get_init_inode(dir, mode);
2258         if (!inode) {
2259                 status = -ENOMEM;
2260                 mlog_errno(status);
2261                 goto leave;
2262         }
2263
2264         handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
2265         if (IS_ERR(handle)) {
2266                 status = PTR_ERR(handle);
2267                 handle = NULL;
2268                 mlog_errno(status);
2269                 goto leave;
2270         }
2271
2272         status = dquot_alloc_inode(inode);
2273         if (status)
2274                 goto leave;
2275         did_quota_inode = 1;
2276
2277         status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
2278                                               &suballoc_loc,
2279                                               &suballoc_bit, di_blkno);
2280         if (status < 0) {
2281                 mlog_errno(status);
2282                 goto leave;
2283         }
2284
2285         inode->i_nlink = 0;
2286         /* do the real work now. */
2287         status = __ocfs2_mknod_locked(dir, inode,
2288                                       0, &new_di_bh, parent_di_bh, handle,
2289                                       inode_ac, di_blkno, suballoc_loc,
2290                                       suballoc_bit);
2291         if (status < 0) {
2292                 mlog_errno(status);
2293                 goto leave;
2294         }
2295
2296         di = (struct ocfs2_dinode *)new_di_bh->b_data;
2297         status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
2298                                   &orphan_insert, orphan_dir);
2299         if (status < 0) {
2300                 mlog_errno(status);
2301                 goto leave;
2302         }
2303
2304         /* get open lock so that only nodes can't remove it from orphan dir. */
2305         status = ocfs2_open_lock(inode);
2306         if (status < 0)
2307                 mlog_errno(status);
2308
2309         insert_inode_hash(inode);
2310 leave:
2311         if (status < 0 && did_quota_inode)
2312                 dquot_free_inode(inode);
2313         if (handle)
2314                 ocfs2_commit_trans(osb, handle);
2315
2316         if (orphan_dir) {
2317                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
2318                 ocfs2_inode_unlock(orphan_dir, 1);
2319                 mutex_unlock(&orphan_dir->i_mutex);
2320                 iput(orphan_dir);
2321         }
2322
2323         if ((status < 0) && inode) {
2324                 clear_nlink(inode);
2325                 iput(inode);
2326         }
2327
2328         if (inode_ac)
2329                 ocfs2_free_alloc_context(inode_ac);
2330
2331         brelse(new_di_bh);
2332
2333         if (!status)
2334                 *new_inode = inode;
2335
2336         ocfs2_free_dir_lookup_result(&orphan_insert);
2337
2338         ocfs2_inode_unlock(dir, 1);
2339         brelse(parent_di_bh);
2340         return status;
2341 }
2342
2343 int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
2344                                    struct inode *inode,
2345                                    struct dentry *dentry)
2346 {
2347         int status = 0;
2348         struct buffer_head *parent_di_bh = NULL;
2349         handle_t *handle = NULL;
2350         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2351         struct ocfs2_dinode *dir_di, *di;
2352         struct inode *orphan_dir_inode = NULL;
2353         struct buffer_head *orphan_dir_bh = NULL;
2354         struct buffer_head *di_bh = NULL;
2355         struct ocfs2_dir_lookup_result lookup = { NULL, };
2356
2357         trace_ocfs2_mv_orphaned_inode_to_new(dir, dentry,
2358                                 dentry->d_name.len, dentry->d_name.name,
2359                                 (unsigned long long)OCFS2_I(dir)->ip_blkno,
2360                                 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2361
2362         status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2363         if (status < 0) {
2364                 if (status != -ENOENT)
2365                         mlog_errno(status);
2366                 return status;
2367         }
2368
2369         dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
2370         if (!dir_di->i_links_count) {
2371                 /* can't make a file in a deleted directory. */
2372                 status = -ENOENT;
2373                 goto leave;
2374         }
2375
2376         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
2377                                            dentry->d_name.len);
2378         if (status)
2379                 goto leave;
2380
2381         /* get a spot inside the dir. */
2382         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_di_bh,
2383                                               dentry->d_name.name,
2384                                               dentry->d_name.len, &lookup);
2385         if (status < 0) {
2386                 mlog_errno(status);
2387                 goto leave;
2388         }
2389
2390         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2391                                                        ORPHAN_DIR_SYSTEM_INODE,
2392                                                        osb->slot_num);
2393         if (!orphan_dir_inode) {
2394                 status = -EEXIST;
2395                 mlog_errno(status);
2396                 goto leave;
2397         }
2398
2399         mutex_lock(&orphan_dir_inode->i_mutex);
2400
2401         status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2402         if (status < 0) {
2403                 mlog_errno(status);
2404                 mutex_unlock(&orphan_dir_inode->i_mutex);
2405                 iput(orphan_dir_inode);
2406                 goto leave;
2407         }
2408
2409         status = ocfs2_read_inode_block(inode, &di_bh);
2410         if (status < 0) {
2411                 mlog_errno(status);
2412                 goto orphan_unlock;
2413         }
2414
2415         handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
2416         if (IS_ERR(handle)) {
2417                 status = PTR_ERR(handle);
2418                 handle = NULL;
2419                 mlog_errno(status);
2420                 goto orphan_unlock;
2421         }
2422
2423         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
2424                                          di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2425         if (status < 0) {
2426                 mlog_errno(status);
2427                 goto out_commit;
2428         }
2429
2430         status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
2431                                   orphan_dir_bh);
2432         if (status < 0) {
2433                 mlog_errno(status);
2434                 goto out_commit;
2435         }
2436
2437         di = (struct ocfs2_dinode *)di_bh->b_data;
2438         le32_add_cpu(&di->i_flags, -OCFS2_ORPHANED_FL);
2439         di->i_orphaned_slot = 0;
2440         inode->i_nlink = 1;
2441         ocfs2_set_links_count(di, inode->i_nlink);
2442         ocfs2_journal_dirty(handle, di_bh);
2443
2444         status = ocfs2_add_entry(handle, dentry, inode,
2445                                  OCFS2_I(inode)->ip_blkno, parent_di_bh,
2446                                  &lookup);
2447         if (status < 0) {
2448                 mlog_errno(status);
2449                 goto out_commit;
2450         }
2451
2452         status = ocfs2_dentry_attach_lock(dentry, inode,
2453                                           OCFS2_I(dir)->ip_blkno);
2454         if (status) {
2455                 mlog_errno(status);
2456                 goto out_commit;
2457         }
2458
2459         d_instantiate(dentry, inode);
2460         status = 0;
2461 out_commit:
2462         ocfs2_commit_trans(osb, handle);
2463 orphan_unlock:
2464         ocfs2_inode_unlock(orphan_dir_inode, 1);
2465         mutex_unlock(&orphan_dir_inode->i_mutex);
2466         iput(orphan_dir_inode);
2467 leave:
2468
2469         ocfs2_inode_unlock(dir, 1);
2470
2471         brelse(di_bh);
2472         brelse(parent_di_bh);
2473         brelse(orphan_dir_bh);
2474
2475         ocfs2_free_dir_lookup_result(&lookup);
2476
2477         if (status)
2478                 mlog_errno(status);
2479
2480         return status;
2481 }
2482
2483 const struct inode_operations ocfs2_dir_iops = {
2484         .create         = ocfs2_create,
2485         .lookup         = ocfs2_lookup,
2486         .link           = ocfs2_link,
2487         .unlink         = ocfs2_unlink,
2488         .rmdir          = ocfs2_unlink,
2489         .symlink        = ocfs2_symlink,
2490         .mkdir          = ocfs2_mkdir,
2491         .mknod          = ocfs2_mknod,
2492         .rename         = ocfs2_rename,
2493         .setattr        = ocfs2_setattr,
2494         .getattr        = ocfs2_getattr,
2495         .permission     = ocfs2_permission,
2496         .setxattr       = generic_setxattr,
2497         .getxattr       = generic_getxattr,
2498         .listxattr      = ocfs2_listxattr,
2499         .removexattr    = generic_removexattr,
2500         .fiemap         = ocfs2_fiemap,
2501 };