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ocfs2: fix a tiny race when running dirop_fileop_racer
[mirror_ubuntu-bionic-kernel.git] / fs / ocfs2 / namei.c
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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
69static 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
78static 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
84static 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
92static 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
100static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
101 unsigned int flags)
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
147bail_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
174bail_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
181bail:
182
183 trace_ocfs2_lookup_ret(ret);
184
185 return ret;
186}
187
188static struct inode *ocfs2_get_init_inode(struct inode *dir, umode_t 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 set_nlink(inode, 2);
203 inode_init_owner(inode, dir, mode);
204 dquot_initialize(inode);
205 return inode;
206}
207
208static int ocfs2_mknod(struct inode *dir,
209 struct dentry *dentry,
210 umode_t mode,
211 dev_t dev)
212{
213 int status = 0;
214 struct buffer_head *parent_fe_bh = NULL;
215 handle_t *handle = NULL;
216 struct ocfs2_super *osb;
217 struct ocfs2_dinode *dirfe;
218 struct buffer_head *new_fe_bh = NULL;
219 struct inode *inode = NULL;
220 struct ocfs2_alloc_context *inode_ac = NULL;
221 struct ocfs2_alloc_context *data_ac = NULL;
222 struct ocfs2_alloc_context *meta_ac = NULL;
223 int want_clusters = 0;
224 int want_meta = 0;
225 int xattr_credits = 0;
226 struct ocfs2_security_xattr_info si = {
227 .enable = 1,
228 };
229 int did_quota_inode = 0;
230 struct ocfs2_dir_lookup_result lookup = { NULL, };
231 sigset_t oldset;
232 int did_block_signals = 0;
233 struct posix_acl *default_acl = NULL, *acl = NULL;
234
235 trace_ocfs2_mknod(dir, dentry, dentry->d_name.len, dentry->d_name.name,
236 (unsigned long long)OCFS2_I(dir)->ip_blkno,
237 (unsigned long)dev, mode);
238
239 dquot_initialize(dir);
240
241 /* get our super block */
242 osb = OCFS2_SB(dir->i_sb);
243
244 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
245 if (status < 0) {
246 if (status != -ENOENT)
247 mlog_errno(status);
248 return status;
249 }
250
251 if (S_ISDIR(mode) && (dir->i_nlink >= ocfs2_link_max(osb))) {
252 status = -EMLINK;
253 goto leave;
254 }
255
256 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
257 if (!ocfs2_read_links_count(dirfe)) {
258 /* can't make a file in a deleted directory. */
259 status = -ENOENT;
260 goto leave;
261 }
262
263 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
264 dentry->d_name.len);
265 if (status)
266 goto leave;
267
268 /* get a spot inside the dir. */
269 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
270 dentry->d_name.name,
271 dentry->d_name.len, &lookup);
272 if (status < 0) {
273 mlog_errno(status);
274 goto leave;
275 }
276
277 /* reserve an inode spot */
278 status = ocfs2_reserve_new_inode(osb, &inode_ac);
279 if (status < 0) {
280 if (status != -ENOSPC)
281 mlog_errno(status);
282 goto leave;
283 }
284
285 inode = ocfs2_get_init_inode(dir, mode);
286 if (!inode) {
287 status = -ENOMEM;
288 mlog_errno(status);
289 goto leave;
290 }
291
292 /* get security xattr */
293 status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
294 if (status) {
295 if (status == -EOPNOTSUPP)
296 si.enable = 0;
297 else {
298 mlog_errno(status);
299 goto leave;
300 }
301 }
302
303 /* calculate meta data/clusters for setting security and acl xattr */
304 status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
305 &si, &want_clusters,
306 &xattr_credits, &want_meta);
307 if (status < 0) {
308 mlog_errno(status);
309 goto leave;
310 }
311
312 /* Reserve a cluster if creating an extent based directory. */
313 if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
314 want_clusters += 1;
315
316 /* Dir indexing requires extra space as well */
317 if (ocfs2_supports_indexed_dirs(osb))
318 want_meta++;
319 }
320
321 status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac);
322 if (status < 0) {
323 if (status != -ENOSPC)
324 mlog_errno(status);
325 goto leave;
326 }
327
328 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
329 if (status < 0) {
330 if (status != -ENOSPC)
331 mlog_errno(status);
332 goto leave;
333 }
334
335 status = posix_acl_create(dir, &mode, &default_acl, &acl);
336 if (status) {
337 mlog_errno(status);
338 goto leave;
339 }
340
341 handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb,
342 S_ISDIR(mode),
343 xattr_credits));
344 if (IS_ERR(handle)) {
345 status = PTR_ERR(handle);
346 handle = NULL;
347 mlog_errno(status);
348 goto leave;
349 }
350
351 /* Starting to change things, restart is no longer possible. */
352 ocfs2_block_signals(&oldset);
353 did_block_signals = 1;
354
355 status = dquot_alloc_inode(inode);
356 if (status)
357 goto leave;
358 did_quota_inode = 1;
359
360 /* do the real work now. */
361 status = ocfs2_mknod_locked(osb, dir, inode, dev,
362 &new_fe_bh, parent_fe_bh, handle,
363 inode_ac);
364 if (status < 0) {
365 mlog_errno(status);
366 goto leave;
367 }
368
369 if (S_ISDIR(mode)) {
370 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
371 new_fe_bh, data_ac, meta_ac);
372 if (status < 0) {
373 mlog_errno(status);
374 goto leave;
375 }
376
377 status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
378 parent_fe_bh,
379 OCFS2_JOURNAL_ACCESS_WRITE);
380 if (status < 0) {
381 mlog_errno(status);
382 goto leave;
383 }
384 ocfs2_add_links_count(dirfe, 1);
385 ocfs2_journal_dirty(handle, parent_fe_bh);
386 inc_nlink(dir);
387 }
388
389 if (default_acl) {
390 status = ocfs2_set_acl(handle, inode, new_fe_bh,
391 ACL_TYPE_DEFAULT, default_acl,
392 meta_ac, data_ac);
393 }
394 if (!status && acl) {
395 status = ocfs2_set_acl(handle, inode, new_fe_bh,
396 ACL_TYPE_ACCESS, acl,
397 meta_ac, data_ac);
398 }
399
400 if (status < 0) {
401 mlog_errno(status);
402 goto leave;
403 }
404
405 if (si.enable) {
406 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
407 meta_ac, data_ac);
408 if (status < 0) {
409 mlog_errno(status);
410 goto leave;
411 }
412 }
413
414 /*
415 * Do this before adding the entry to the directory. We add
416 * also set d_op after success so that ->d_iput() will cleanup
417 * the dentry lock even if ocfs2_add_entry() fails below.
418 */
419 status = ocfs2_dentry_attach_lock(dentry, inode,
420 OCFS2_I(dir)->ip_blkno);
421 if (status) {
422 mlog_errno(status);
423 goto leave;
424 }
425
426 status = ocfs2_add_entry(handle, dentry, inode,
427 OCFS2_I(inode)->ip_blkno, parent_fe_bh,
428 &lookup);
429 if (status < 0) {
430 mlog_errno(status);
431 goto leave;
432 }
433
434 insert_inode_hash(inode);
435 d_instantiate(dentry, inode);
436 status = 0;
437leave:
438 if (default_acl)
439 posix_acl_release(default_acl);
440 if (acl)
441 posix_acl_release(acl);
442 if (status < 0 && did_quota_inode)
443 dquot_free_inode(inode);
444 if (handle)
445 ocfs2_commit_trans(osb, handle);
446
447 ocfs2_inode_unlock(dir, 1);
448 if (did_block_signals)
449 ocfs2_unblock_signals(&oldset);
450
451 brelse(new_fe_bh);
452 brelse(parent_fe_bh);
453 kfree(si.value);
454
455 ocfs2_free_dir_lookup_result(&lookup);
456
457 if (inode_ac)
458 ocfs2_free_alloc_context(inode_ac);
459
460 if (data_ac)
461 ocfs2_free_alloc_context(data_ac);
462
463 if (meta_ac)
464 ocfs2_free_alloc_context(meta_ac);
465
466 /*
467 * We should call iput after the i_mutex of the bitmap been
468 * unlocked in ocfs2_free_alloc_context, or the
469 * ocfs2_delete_inode will mutex_lock again.
470 */
471 if ((status < 0) && inode) {
472 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
473 clear_nlink(inode);
474 iput(inode);
475 }
476
477 if (status)
478 mlog_errno(status);
479
480 return status;
481}
482
483static int __ocfs2_mknod_locked(struct inode *dir,
484 struct inode *inode,
485 dev_t dev,
486 struct buffer_head **new_fe_bh,
487 struct buffer_head *parent_fe_bh,
488 handle_t *handle,
489 struct ocfs2_alloc_context *inode_ac,
490 u64 fe_blkno, u64 suballoc_loc, u16 suballoc_bit)
491{
492 int status = 0;
493 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
494 struct ocfs2_dinode *fe = NULL;
495 struct ocfs2_extent_list *fel;
496 u16 feat;
497 struct ocfs2_inode_info *oi = OCFS2_I(inode);
498
499 *new_fe_bh = NULL;
500
501 /* populate as many fields early on as possible - many of
502 * these are used by the support functions here and in
503 * callers. */
504 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
505 OCFS2_I(inode)->ip_blkno = fe_blkno;
506 spin_lock(&osb->osb_lock);
507 inode->i_generation = osb->s_next_generation++;
508 spin_unlock(&osb->osb_lock);
509
510 *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
511 if (!*new_fe_bh) {
512 status = -ENOMEM;
513 mlog_errno(status);
514 goto leave;
515 }
516 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), *new_fe_bh);
517
518 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
519 *new_fe_bh,
520 OCFS2_JOURNAL_ACCESS_CREATE);
521 if (status < 0) {
522 mlog_errno(status);
523 goto leave;
524 }
525
526 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
527 memset(fe, 0, osb->sb->s_blocksize);
528
529 fe->i_generation = cpu_to_le32(inode->i_generation);
530 fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
531 fe->i_blkno = cpu_to_le64(fe_blkno);
532 fe->i_suballoc_loc = cpu_to_le64(suballoc_loc);
533 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
534 fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot);
535 fe->i_uid = cpu_to_le32(i_uid_read(inode));
536 fe->i_gid = cpu_to_le32(i_gid_read(inode));
537 fe->i_mode = cpu_to_le16(inode->i_mode);
538 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
539 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
540
541 ocfs2_set_links_count(fe, inode->i_nlink);
542
543 fe->i_last_eb_blk = 0;
544 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
545 fe->i_flags |= cpu_to_le32(OCFS2_VALID_FL);
546 fe->i_atime = fe->i_ctime = fe->i_mtime =
547 cpu_to_le64(CURRENT_TIME.tv_sec);
548 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
549 cpu_to_le32(CURRENT_TIME.tv_nsec);
550 fe->i_dtime = 0;
551
552 /*
553 * If supported, directories start with inline data. If inline
554 * isn't supported, but indexing is, we start them as indexed.
555 */
556 feat = le16_to_cpu(fe->i_dyn_features);
557 if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
558 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
559
560 fe->id2.i_data.id_count = cpu_to_le16(
561 ocfs2_max_inline_data_with_xattr(osb->sb, fe));
562 } else {
563 fel = &fe->id2.i_list;
564 fel->l_tree_depth = 0;
565 fel->l_next_free_rec = 0;
566 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
567 }
568
569 ocfs2_journal_dirty(handle, *new_fe_bh);
570
571 ocfs2_populate_inode(inode, fe, 1);
572 ocfs2_ci_set_new(osb, INODE_CACHE(inode));
573 if (!ocfs2_mount_local(osb)) {
574 status = ocfs2_create_new_inode_locks(inode);
575 if (status < 0)
576 mlog_errno(status);
577 }
578
579 oi->i_sync_tid = handle->h_transaction->t_tid;
580 oi->i_datasync_tid = handle->h_transaction->t_tid;
581
582leave:
583 if (status < 0) {
584 if (*new_fe_bh) {
585 brelse(*new_fe_bh);
586 *new_fe_bh = NULL;
587 }
588 }
589
590 if (status)
591 mlog_errno(status);
592 return status;
593}
594
595static int ocfs2_mknod_locked(struct ocfs2_super *osb,
596 struct inode *dir,
597 struct inode *inode,
598 dev_t dev,
599 struct buffer_head **new_fe_bh,
600 struct buffer_head *parent_fe_bh,
601 handle_t *handle,
602 struct ocfs2_alloc_context *inode_ac)
603{
604 int status = 0;
605 u64 suballoc_loc, fe_blkno = 0;
606 u16 suballoc_bit;
607
608 *new_fe_bh = NULL;
609
610 status = ocfs2_claim_new_inode(handle, dir, parent_fe_bh,
611 inode_ac, &suballoc_loc,
612 &suballoc_bit, &fe_blkno);
613 if (status < 0) {
614 mlog_errno(status);
615 return status;
616 }
617
618 return __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
619 parent_fe_bh, handle, inode_ac,
620 fe_blkno, suballoc_loc, suballoc_bit);
621}
622
623static int ocfs2_mkdir(struct inode *dir,
624 struct dentry *dentry,
625 umode_t mode)
626{
627 int ret;
628
629 trace_ocfs2_mkdir(dir, dentry, dentry->d_name.len, dentry->d_name.name,
630 OCFS2_I(dir)->ip_blkno, mode);
631 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
632 if (ret)
633 mlog_errno(ret);
634
635 return ret;
636}
637
638static int ocfs2_create(struct inode *dir,
639 struct dentry *dentry,
640 umode_t mode,
641 bool excl)
642{
643 int ret;
644
645 trace_ocfs2_create(dir, dentry, dentry->d_name.len, dentry->d_name.name,
646 (unsigned long long)OCFS2_I(dir)->ip_blkno, mode);
647 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
648 if (ret)
649 mlog_errno(ret);
650
651 return ret;
652}
653
654static int ocfs2_link(struct dentry *old_dentry,
655 struct inode *dir,
656 struct dentry *dentry)
657{
658 handle_t *handle;
659 struct inode *inode = old_dentry->d_inode;
660 int err;
661 struct buffer_head *fe_bh = NULL;
662 struct buffer_head *parent_fe_bh = NULL;
663 struct ocfs2_dinode *fe = NULL;
664 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
665 struct ocfs2_dir_lookup_result lookup = { NULL, };
666 sigset_t oldset;
667 u64 old_de_ino;
668
669 trace_ocfs2_link((unsigned long long)OCFS2_I(inode)->ip_blkno,
670 old_dentry->d_name.len, old_dentry->d_name.name,
671 dentry->d_name.len, dentry->d_name.name);
672
673 if (S_ISDIR(inode->i_mode))
674 return -EPERM;
675
676 dquot_initialize(dir);
677
678 err = ocfs2_inode_lock_nested(dir, &parent_fe_bh, 1, OI_LS_PARENT);
679 if (err < 0) {
680 if (err != -ENOENT)
681 mlog_errno(err);
682 return err;
683 }
684
685 if (!dir->i_nlink) {
686 err = -ENOENT;
687 goto out;
688 }
689
690 err = ocfs2_lookup_ino_from_name(dir, old_dentry->d_name.name,
691 old_dentry->d_name.len, &old_de_ino);
692 if (err) {
693 err = -ENOENT;
694 goto out;
695 }
696
697 /*
698 * Check whether another node removed the source inode while we
699 * were in the vfs.
700 */
701 if (old_de_ino != OCFS2_I(inode)->ip_blkno) {
702 err = -ENOENT;
703 goto out;
704 }
705
706 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
707 dentry->d_name.len);
708 if (err)
709 goto out;
710
711 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
712 dentry->d_name.name,
713 dentry->d_name.len, &lookup);
714 if (err < 0) {
715 mlog_errno(err);
716 goto out;
717 }
718
719 err = ocfs2_inode_lock(inode, &fe_bh, 1);
720 if (err < 0) {
721 if (err != -ENOENT)
722 mlog_errno(err);
723 goto out;
724 }
725
726 fe = (struct ocfs2_dinode *) fe_bh->b_data;
727 if (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) {
728 err = -EMLINK;
729 goto out_unlock_inode;
730 }
731
732 handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb));
733 if (IS_ERR(handle)) {
734 err = PTR_ERR(handle);
735 handle = NULL;
736 mlog_errno(err);
737 goto out_unlock_inode;
738 }
739
740 /* Starting to change things, restart is no longer possible. */
741 ocfs2_block_signals(&oldset);
742
743 err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
744 OCFS2_JOURNAL_ACCESS_WRITE);
745 if (err < 0) {
746 mlog_errno(err);
747 goto out_commit;
748 }
749
750 inc_nlink(inode);
751 inode->i_ctime = CURRENT_TIME;
752 ocfs2_set_links_count(fe, inode->i_nlink);
753 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
754 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
755 ocfs2_journal_dirty(handle, fe_bh);
756
757 err = ocfs2_add_entry(handle, dentry, inode,
758 OCFS2_I(inode)->ip_blkno,
759 parent_fe_bh, &lookup);
760 if (err) {
761 ocfs2_add_links_count(fe, -1);
762 drop_nlink(inode);
763 mlog_errno(err);
764 goto out_commit;
765 }
766
767 err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
768 if (err) {
769 mlog_errno(err);
770 goto out_commit;
771 }
772
773 ihold(inode);
774 d_instantiate(dentry, inode);
775
776out_commit:
777 ocfs2_commit_trans(osb, handle);
778 ocfs2_unblock_signals(&oldset);
779out_unlock_inode:
780 ocfs2_inode_unlock(inode, 1);
781
782out:
783 ocfs2_inode_unlock(dir, 1);
784
785 brelse(fe_bh);
786 brelse(parent_fe_bh);
787
788 ocfs2_free_dir_lookup_result(&lookup);
789
790 if (err)
791 mlog_errno(err);
792
793 return err;
794}
795
796/*
797 * Takes and drops an exclusive lock on the given dentry. This will
798 * force other nodes to drop it.
799 */
800static int ocfs2_remote_dentry_delete(struct dentry *dentry)
801{
802 int ret;
803
804 ret = ocfs2_dentry_lock(dentry, 1);
805 if (ret)
806 mlog_errno(ret);
807 else
808 ocfs2_dentry_unlock(dentry, 1);
809
810 return ret;
811}
812
813static inline int ocfs2_inode_is_unlinkable(struct inode *inode)
814{
815 if (S_ISDIR(inode->i_mode)) {
816 if (inode->i_nlink == 2)
817 return 1;
818 return 0;
819 }
820
821 if (inode->i_nlink == 1)
822 return 1;
823 return 0;
824}
825
826static int ocfs2_unlink(struct inode *dir,
827 struct dentry *dentry)
828{
829 int status;
830 int child_locked = 0;
831 bool is_unlinkable = false;
832 struct inode *inode = dentry->d_inode;
833 struct inode *orphan_dir = NULL;
834 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
835 u64 blkno;
836 struct ocfs2_dinode *fe = NULL;
837 struct buffer_head *fe_bh = NULL;
838 struct buffer_head *parent_node_bh = NULL;
839 handle_t *handle = NULL;
840 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
841 struct ocfs2_dir_lookup_result lookup = { NULL, };
842 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
843
844 trace_ocfs2_unlink(dir, dentry, dentry->d_name.len,
845 dentry->d_name.name,
846 (unsigned long long)OCFS2_I(dir)->ip_blkno,
847 (unsigned long long)OCFS2_I(inode)->ip_blkno);
848
849 dquot_initialize(dir);
850
851 BUG_ON(dentry->d_parent->d_inode != dir);
852
853 if (inode == osb->root_inode)
854 return -EPERM;
855
856 status = ocfs2_inode_lock_nested(dir, &parent_node_bh, 1,
857 OI_LS_PARENT);
858 if (status < 0) {
859 if (status != -ENOENT)
860 mlog_errno(status);
861 return status;
862 }
863
864 status = ocfs2_find_files_on_disk(dentry->d_name.name,
865 dentry->d_name.len, &blkno, dir,
866 &lookup);
867 if (status < 0) {
868 if (status != -ENOENT)
869 mlog_errno(status);
870 goto leave;
871 }
872
873 if (OCFS2_I(inode)->ip_blkno != blkno) {
874 status = -ENOENT;
875
876 trace_ocfs2_unlink_noent(
877 (unsigned long long)OCFS2_I(inode)->ip_blkno,
878 (unsigned long long)blkno,
879 OCFS2_I(inode)->ip_flags);
880 goto leave;
881 }
882
883 status = ocfs2_inode_lock(inode, &fe_bh, 1);
884 if (status < 0) {
885 if (status != -ENOENT)
886 mlog_errno(status);
887 goto leave;
888 }
889 child_locked = 1;
890
891 if (S_ISDIR(inode->i_mode)) {
892 if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
893 status = -ENOTEMPTY;
894 goto leave;
895 }
896 }
897
898 status = ocfs2_remote_dentry_delete(dentry);
899 if (status < 0) {
900 /* This remote delete should succeed under all normal
901 * circumstances. */
902 mlog_errno(status);
903 goto leave;
904 }
905
906 if (ocfs2_inode_is_unlinkable(inode)) {
907 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
908 OCFS2_I(inode)->ip_blkno,
909 orphan_name, &orphan_insert);
910 if (status < 0) {
911 mlog_errno(status);
912 goto leave;
913 }
914 is_unlinkable = true;
915 }
916
917 handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb));
918 if (IS_ERR(handle)) {
919 status = PTR_ERR(handle);
920 handle = NULL;
921 mlog_errno(status);
922 goto leave;
923 }
924
925 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
926 OCFS2_JOURNAL_ACCESS_WRITE);
927 if (status < 0) {
928 mlog_errno(status);
929 goto leave;
930 }
931
932 fe = (struct ocfs2_dinode *) fe_bh->b_data;
933
934 /* delete the name from the parent dir */
935 status = ocfs2_delete_entry(handle, dir, &lookup);
936 if (status < 0) {
937 mlog_errno(status);
938 goto leave;
939 }
940
941 if (S_ISDIR(inode->i_mode))
942 drop_nlink(inode);
943 drop_nlink(inode);
944 ocfs2_set_links_count(fe, inode->i_nlink);
945 ocfs2_journal_dirty(handle, fe_bh);
946
947 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
948 if (S_ISDIR(inode->i_mode))
949 drop_nlink(dir);
950
951 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
952 if (status < 0) {
953 mlog_errno(status);
954 if (S_ISDIR(inode->i_mode))
955 inc_nlink(dir);
956 goto leave;
957 }
958
959 if (is_unlinkable) {
960 status = ocfs2_orphan_add(osb, handle, inode, fe_bh,
961 orphan_name, &orphan_insert, orphan_dir);
962 if (status < 0)
963 mlog_errno(status);
964 }
965
966leave:
967 if (handle)
968 ocfs2_commit_trans(osb, handle);
969
970 if (child_locked)
971 ocfs2_inode_unlock(inode, 1);
972
973 ocfs2_inode_unlock(dir, 1);
974
975 if (orphan_dir) {
976 /* This was locked for us in ocfs2_prepare_orphan_dir() */
977 ocfs2_inode_unlock(orphan_dir, 1);
978 mutex_unlock(&orphan_dir->i_mutex);
979 iput(orphan_dir);
980 }
981
982 brelse(fe_bh);
983 brelse(parent_node_bh);
984
985 ocfs2_free_dir_lookup_result(&orphan_insert);
986 ocfs2_free_dir_lookup_result(&lookup);
987
988 if (status && (status != -ENOTEMPTY) && (status != -ENOENT))
989 mlog_errno(status);
990
991 return status;
992}
993
994static int ocfs2_check_if_ancestor(struct ocfs2_super *osb,
995 u64 src_inode_no, u64 dest_inode_no)
996{
997 int ret = 0, i = 0;
998 u64 parent_inode_no = 0;
999 u64 child_inode_no = src_inode_no;
1000 struct inode *child_inode;
1001
1002#define MAX_LOOKUP_TIMES 32
1003 while (1) {
1004 child_inode = ocfs2_iget(osb, child_inode_no, 0, 0);
1005 if (IS_ERR(child_inode)) {
1006 ret = PTR_ERR(child_inode);
1007 break;
1008 }
1009
1010 ret = ocfs2_inode_lock(child_inode, NULL, 0);
1011 if (ret < 0) {
1012 iput(child_inode);
1013 if (ret != -ENOENT)
1014 mlog_errno(ret);
1015 break;
1016 }
1017
1018 ret = ocfs2_lookup_ino_from_name(child_inode, "..", 2,
1019 &parent_inode_no);
1020 ocfs2_inode_unlock(child_inode, 0);
1021 iput(child_inode);
1022 if (ret < 0) {
1023 ret = -ENOENT;
1024 break;
1025 }
1026
1027 if (parent_inode_no == dest_inode_no) {
1028 ret = 1;
1029 break;
1030 }
1031
1032 if (parent_inode_no == osb->root_inode->i_ino) {
1033 ret = 0;
1034 break;
1035 }
1036
1037 child_inode_no = parent_inode_no;
1038
1039 if (++i >= MAX_LOOKUP_TIMES) {
1040 mlog(ML_NOTICE, "max lookup times reached, filesystem "
1041 "may have nested directories, "
1042 "src inode: %llu, dest inode: %llu.\n",
1043 (unsigned long long)src_inode_no,
1044 (unsigned long long)dest_inode_no);
1045 ret = 0;
1046 break;
1047 }
1048 }
1049
1050 return ret;
1051}
1052
1053/*
1054 * The only place this should be used is rename!
1055 * if they have the same id, then the 1st one is the only one locked.
1056 */
1057static int ocfs2_double_lock(struct ocfs2_super *osb,
1058 struct buffer_head **bh1,
1059 struct inode *inode1,
1060 struct buffer_head **bh2,
1061 struct inode *inode2)
1062{
1063 int status;
1064 int inode1_is_ancestor, inode2_is_ancestor;
1065 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
1066 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
1067 struct buffer_head **tmpbh;
1068 struct inode *tmpinode;
1069
1070 trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno,
1071 (unsigned long long)oi2->ip_blkno);
1072
1073 if (*bh1)
1074 *bh1 = NULL;
1075 if (*bh2)
1076 *bh2 = NULL;
1077
1078 /* we always want to lock the one with the lower lockid first.
1079 * and if they are nested, we lock ancestor first */
1080 if (oi1->ip_blkno != oi2->ip_blkno) {
1081 inode1_is_ancestor = ocfs2_check_if_ancestor(osb, oi2->ip_blkno,
1082 oi1->ip_blkno);
1083 if (inode1_is_ancestor < 0) {
1084 status = inode1_is_ancestor;
1085 goto bail;
1086 }
1087
1088 inode2_is_ancestor = ocfs2_check_if_ancestor(osb, oi1->ip_blkno,
1089 oi2->ip_blkno);
1090 if (inode2_is_ancestor < 0) {
1091 status = inode2_is_ancestor;
1092 goto bail;
1093 }
1094
1095 if ((inode1_is_ancestor == 1) ||
1096 (oi1->ip_blkno < oi2->ip_blkno &&
1097 inode2_is_ancestor == 0)) {
1098 /* switch id1 and id2 around */
1099 tmpbh = bh2;
1100 bh2 = bh1;
1101 bh1 = tmpbh;
1102
1103 tmpinode = inode2;
1104 inode2 = inode1;
1105 inode1 = tmpinode;
1106 }
1107 /* lock id2 */
1108 status = ocfs2_inode_lock_nested(inode2, bh2, 1,
1109 OI_LS_RENAME1);
1110 if (status < 0) {
1111 if (status != -ENOENT)
1112 mlog_errno(status);
1113 goto bail;
1114 }
1115 }
1116
1117 /* lock id1 */
1118 status = ocfs2_inode_lock_nested(inode1, bh1, 1, OI_LS_RENAME2);
1119 if (status < 0) {
1120 /*
1121 * An error return must mean that no cluster locks
1122 * were held on function exit.
1123 */
1124 if (oi1->ip_blkno != oi2->ip_blkno) {
1125 ocfs2_inode_unlock(inode2, 1);
1126 brelse(*bh2);
1127 *bh2 = NULL;
1128 }
1129
1130 if (status != -ENOENT)
1131 mlog_errno(status);
1132 }
1133
1134 trace_ocfs2_double_lock_end(
1135 (unsigned long long)OCFS2_I(inode1)->ip_blkno,
1136 (unsigned long long)OCFS2_I(inode2)->ip_blkno);
1137
1138bail:
1139 if (status)
1140 mlog_errno(status);
1141 return status;
1142}
1143
1144static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1145{
1146 ocfs2_inode_unlock(inode1, 1);
1147
1148 if (inode1 != inode2)
1149 ocfs2_inode_unlock(inode2, 1);
1150}
1151
1152static int ocfs2_rename(struct inode *old_dir,
1153 struct dentry *old_dentry,
1154 struct inode *new_dir,
1155 struct dentry *new_dentry)
1156{
1157 int status = 0, rename_lock = 0, parents_locked = 0, target_exists = 0;
1158 int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 0;
1159 struct inode *old_inode = old_dentry->d_inode;
1160 struct inode *new_inode = new_dentry->d_inode;
1161 struct inode *orphan_dir = NULL;
1162 struct ocfs2_dinode *newfe = NULL;
1163 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1164 struct buffer_head *newfe_bh = NULL;
1165 struct buffer_head *old_inode_bh = NULL;
1166 struct ocfs2_super *osb = NULL;
1167 u64 newfe_blkno, old_de_ino;
1168 handle_t *handle = NULL;
1169 struct buffer_head *old_dir_bh = NULL;
1170 struct buffer_head *new_dir_bh = NULL;
1171 u32 old_dir_nlink = old_dir->i_nlink;
1172 struct ocfs2_dinode *old_di;
1173 struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
1174 struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
1175 struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
1176 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
1177 struct ocfs2_dir_lookup_result target_insert = { NULL, };
1178 bool should_add_orphan = false;
1179
1180 /* At some point it might be nice to break this function up a
1181 * bit. */
1182
1183 trace_ocfs2_rename(old_dir, old_dentry, new_dir, new_dentry,
1184 old_dentry->d_name.len, old_dentry->d_name.name,
1185 new_dentry->d_name.len, new_dentry->d_name.name);
1186
1187 dquot_initialize(old_dir);
1188 dquot_initialize(new_dir);
1189
1190 osb = OCFS2_SB(old_dir->i_sb);
1191
1192 if (new_inode) {
1193 if (!igrab(new_inode))
1194 BUG();
1195 }
1196
1197 /* Assume a directory hierarchy thusly:
1198 * a/b/c
1199 * a/d
1200 * a,b,c, and d are all directories.
1201 *
1202 * from cwd of 'a' on both nodes:
1203 * node1: mv b/c d
1204 * node2: mv d b/c
1205 *
1206 * And that's why, just like the VFS, we need a file system
1207 * rename lock. */
1208 if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
1209 status = ocfs2_rename_lock(osb);
1210 if (status < 0) {
1211 mlog_errno(status);
1212 goto bail;
1213 }
1214 rename_lock = 1;
1215
1216 /* here we cannot guarantee the inodes haven't just been
1217 * changed, so check if they are nested again */
1218 status = ocfs2_check_if_ancestor(osb, new_dir->i_ino,
1219 old_inode->i_ino);
1220 if (status < 0) {
1221 mlog_errno(status);
1222 goto bail;
1223 } else if (status == 1) {
1224 status = -EPERM;
1225 trace_ocfs2_rename_not_permitted(
1226 (unsigned long long)old_inode->i_ino,
1227 (unsigned long long)new_dir->i_ino);
1228 goto bail;
1229 }
1230 }
1231
1232 /* if old and new are the same, this'll just do one lock. */
1233 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1234 &new_dir_bh, new_dir);
1235 if (status < 0) {
1236 mlog_errno(status);
1237 goto bail;
1238 }
1239 parents_locked = 1;
1240
1241 /* make sure both dirs have bhs
1242 * get an extra ref on old_dir_bh if old==new */
1243 if (!new_dir_bh) {
1244 if (old_dir_bh) {
1245 new_dir_bh = old_dir_bh;
1246 get_bh(new_dir_bh);
1247 } else {
1248 mlog(ML_ERROR, "no old_dir_bh!\n");
1249 status = -EIO;
1250 goto bail;
1251 }
1252 }
1253
1254 /*
1255 * Aside from allowing a meta data update, the locking here
1256 * also ensures that the downconvert thread on other nodes
1257 * won't have to concurrently downconvert the inode and the
1258 * dentry locks.
1259 */
1260 status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
1261 OI_LS_PARENT);
1262 if (status < 0) {
1263 if (status != -ENOENT)
1264 mlog_errno(status);
1265 goto bail;
1266 }
1267 old_child_locked = 1;
1268
1269 status = ocfs2_remote_dentry_delete(old_dentry);
1270 if (status < 0) {
1271 mlog_errno(status);
1272 goto bail;
1273 }
1274
1275 if (S_ISDIR(old_inode->i_mode)) {
1276 u64 old_inode_parent;
1277
1278 update_dot_dot = 1;
1279 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1280 old_inode,
1281 &old_inode_dot_dot_res);
1282 if (status) {
1283 status = -EIO;
1284 goto bail;
1285 }
1286
1287 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1288 status = -EIO;
1289 goto bail;
1290 }
1291
1292 if (!new_inode && new_dir != old_dir &&
1293 new_dir->i_nlink >= ocfs2_link_max(osb)) {
1294 status = -EMLINK;
1295 goto bail;
1296 }
1297 }
1298
1299 status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1300 old_dentry->d_name.len,
1301 &old_de_ino);
1302 if (status) {
1303 status = -ENOENT;
1304 goto bail;
1305 }
1306
1307 /*
1308 * Check for inode number is _not_ due to possible IO errors.
1309 * We might rmdir the source, keep it as pwd of some process
1310 * and merrily kill the link to whatever was created under the
1311 * same name. Goodbye sticky bit ;-<
1312 */
1313 if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1314 status = -ENOENT;
1315 goto bail;
1316 }
1317
1318 /* check if the target already exists (in which case we need
1319 * to delete it */
1320 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1321 new_dentry->d_name.len,
1322 &newfe_blkno, new_dir,
1323 &target_lookup_res);
1324 /* The only error we allow here is -ENOENT because the new
1325 * file not existing is perfectly valid. */
1326 if ((status < 0) && (status != -ENOENT)) {
1327 /* If we cannot find the file specified we should just */
1328 /* return the error... */
1329 mlog_errno(status);
1330 goto bail;
1331 }
1332 if (status == 0)
1333 target_exists = 1;
1334
1335 if (!target_exists && new_inode) {
1336 /*
1337 * Target was unlinked by another node while we were
1338 * waiting to get to ocfs2_rename(). There isn't
1339 * anything we can do here to help the situation, so
1340 * bubble up the appropriate error.
1341 */
1342 status = -ENOENT;
1343 goto bail;
1344 }
1345
1346 /* In case we need to overwrite an existing file, we blow it
1347 * away first */
1348 if (target_exists) {
1349 /* VFS didn't think there existed an inode here, but
1350 * someone else in the cluster must have raced our
1351 * rename to create one. Today we error cleanly, in
1352 * the future we should consider calling iget to build
1353 * a new struct inode for this entry. */
1354 if (!new_inode) {
1355 status = -EACCES;
1356
1357 trace_ocfs2_rename_target_exists(new_dentry->d_name.len,
1358 new_dentry->d_name.name);
1359 goto bail;
1360 }
1361
1362 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1363 status = -EACCES;
1364
1365 trace_ocfs2_rename_disagree(
1366 (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1367 (unsigned long long)newfe_blkno,
1368 OCFS2_I(new_inode)->ip_flags);
1369 goto bail;
1370 }
1371
1372 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1373 if (status < 0) {
1374 if (status != -ENOENT)
1375 mlog_errno(status);
1376 goto bail;
1377 }
1378 new_child_locked = 1;
1379
1380 status = ocfs2_remote_dentry_delete(new_dentry);
1381 if (status < 0) {
1382 mlog_errno(status);
1383 goto bail;
1384 }
1385
1386 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1387
1388 trace_ocfs2_rename_over_existing(
1389 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1390 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1391
1392 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1393 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1394 OCFS2_I(new_inode)->ip_blkno,
1395 orphan_name, &orphan_insert);
1396 if (status < 0) {
1397 mlog_errno(status);
1398 goto bail;
1399 }
1400 should_add_orphan = true;
1401 }
1402 } else {
1403 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1404
1405 status = ocfs2_check_dir_for_entry(new_dir,
1406 new_dentry->d_name.name,
1407 new_dentry->d_name.len);
1408 if (status)
1409 goto bail;
1410
1411 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1412 new_dentry->d_name.name,
1413 new_dentry->d_name.len,
1414 &target_insert);
1415 if (status < 0) {
1416 mlog_errno(status);
1417 goto bail;
1418 }
1419 }
1420
1421 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
1422 if (IS_ERR(handle)) {
1423 status = PTR_ERR(handle);
1424 handle = NULL;
1425 mlog_errno(status);
1426 goto bail;
1427 }
1428
1429 if (target_exists) {
1430 if (S_ISDIR(new_inode->i_mode)) {
1431 if (new_inode->i_nlink != 2 ||
1432 !ocfs2_empty_dir(new_inode)) {
1433 status = -ENOTEMPTY;
1434 goto bail;
1435 }
1436 }
1437 status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
1438 newfe_bh,
1439 OCFS2_JOURNAL_ACCESS_WRITE);
1440 if (status < 0) {
1441 mlog_errno(status);
1442 goto bail;
1443 }
1444
1445 /* change the dirent to point to the correct inode */
1446 status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
1447 old_inode);
1448 if (status < 0) {
1449 mlog_errno(status);
1450 goto bail;
1451 }
1452 new_dir->i_version++;
1453
1454 if (S_ISDIR(new_inode->i_mode))
1455 ocfs2_set_links_count(newfe, 0);
1456 else
1457 ocfs2_add_links_count(newfe, -1);
1458 ocfs2_journal_dirty(handle, newfe_bh);
1459 if (should_add_orphan) {
1460 status = ocfs2_orphan_add(osb, handle, new_inode,
1461 newfe_bh, orphan_name,
1462 &orphan_insert, orphan_dir);
1463 if (status < 0) {
1464 mlog_errno(status);
1465 goto bail;
1466 }
1467 }
1468 } else {
1469 /* if the name was not found in new_dir, add it now */
1470 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1471 OCFS2_I(old_inode)->ip_blkno,
1472 new_dir_bh, &target_insert);
1473 }
1474
1475 old_inode->i_ctime = CURRENT_TIME;
1476 mark_inode_dirty(old_inode);
1477
1478 status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode),
1479 old_inode_bh,
1480 OCFS2_JOURNAL_ACCESS_WRITE);
1481 if (status >= 0) {
1482 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1483
1484 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1485 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1486 ocfs2_journal_dirty(handle, old_inode_bh);
1487 } else
1488 mlog_errno(status);
1489
1490 /*
1491 * Now that the name has been added to new_dir, remove the old name.
1492 *
1493 * We don't keep any directory entry context around until now
1494 * because the insert might have changed the type of directory
1495 * we're dealing with.
1496 */
1497 status = ocfs2_find_entry(old_dentry->d_name.name,
1498 old_dentry->d_name.len, old_dir,
1499 &old_entry_lookup);
1500 if (status)
1501 goto bail;
1502
1503 status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
1504 if (status < 0) {
1505 mlog_errno(status);
1506 goto bail;
1507 }
1508
1509 if (new_inode) {
1510 drop_nlink(new_inode);
1511 new_inode->i_ctime = CURRENT_TIME;
1512 }
1513 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1514
1515 if (update_dot_dot) {
1516 status = ocfs2_update_entry(old_inode, handle,
1517 &old_inode_dot_dot_res, new_dir);
1518 drop_nlink(old_dir);
1519 if (new_inode) {
1520 drop_nlink(new_inode);
1521 } else {
1522 inc_nlink(new_dir);
1523 mark_inode_dirty(new_dir);
1524 }
1525 }
1526 mark_inode_dirty(old_dir);
1527 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1528 if (new_inode) {
1529 mark_inode_dirty(new_inode);
1530 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1531 }
1532
1533 if (old_dir != new_dir) {
1534 /* Keep the same times on both directories.*/
1535 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1536
1537 /*
1538 * This will also pick up the i_nlink change from the
1539 * block above.
1540 */
1541 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1542 }
1543
1544 if (old_dir_nlink != old_dir->i_nlink) {
1545 if (!old_dir_bh) {
1546 mlog(ML_ERROR, "need to change nlink for old dir "
1547 "%llu from %d to %d but bh is NULL!\n",
1548 (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1549 (int)old_dir_nlink, old_dir->i_nlink);
1550 } else {
1551 struct ocfs2_dinode *fe;
1552 status = ocfs2_journal_access_di(handle,
1553 INODE_CACHE(old_dir),
1554 old_dir_bh,
1555 OCFS2_JOURNAL_ACCESS_WRITE);
1556 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1557 ocfs2_set_links_count(fe, old_dir->i_nlink);
1558 ocfs2_journal_dirty(handle, old_dir_bh);
1559 }
1560 }
1561 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1562 status = 0;
1563bail:
1564 if (rename_lock)
1565 ocfs2_rename_unlock(osb);
1566
1567 if (handle)
1568 ocfs2_commit_trans(osb, handle);
1569
1570 if (parents_locked)
1571 ocfs2_double_unlock(old_dir, new_dir);
1572
1573 if (old_child_locked)
1574 ocfs2_inode_unlock(old_inode, 1);
1575
1576 if (new_child_locked)
1577 ocfs2_inode_unlock(new_inode, 1);
1578
1579 if (orphan_dir) {
1580 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1581 ocfs2_inode_unlock(orphan_dir, 1);
1582 mutex_unlock(&orphan_dir->i_mutex);
1583 iput(orphan_dir);
1584 }
1585
1586 if (new_inode)
1587 sync_mapping_buffers(old_inode->i_mapping);
1588
1589 if (new_inode)
1590 iput(new_inode);
1591
1592 ocfs2_free_dir_lookup_result(&target_lookup_res);
1593 ocfs2_free_dir_lookup_result(&old_entry_lookup);
1594 ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
1595 ocfs2_free_dir_lookup_result(&orphan_insert);
1596 ocfs2_free_dir_lookup_result(&target_insert);
1597
1598 brelse(newfe_bh);
1599 brelse(old_inode_bh);
1600 brelse(old_dir_bh);
1601 brelse(new_dir_bh);
1602
1603 if (status)
1604 mlog_errno(status);
1605
1606 return status;
1607}
1608
1609/*
1610 * we expect i_size = strlen(symname). Copy symname into the file
1611 * data, including the null terminator.
1612 */
1613static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1614 handle_t *handle,
1615 struct inode *inode,
1616 const char *symname)
1617{
1618 struct buffer_head **bhs = NULL;
1619 const char *c;
1620 struct super_block *sb = osb->sb;
1621 u64 p_blkno, p_blocks;
1622 int virtual, blocks, status, i, bytes_left;
1623
1624 bytes_left = i_size_read(inode) + 1;
1625 /* we can't trust i_blocks because we're actually going to
1626 * write i_size + 1 bytes. */
1627 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1628
1629 trace_ocfs2_create_symlink_data((unsigned long long)inode->i_blocks,
1630 i_size_read(inode), blocks);
1631
1632 /* Sanity check -- make sure we're going to fit. */
1633 if (bytes_left >
1634 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1635 status = -EIO;
1636 mlog_errno(status);
1637 goto bail;
1638 }
1639
1640 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1641 if (!bhs) {
1642 status = -ENOMEM;
1643 mlog_errno(status);
1644 goto bail;
1645 }
1646
1647 status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1648 NULL);
1649 if (status < 0) {
1650 mlog_errno(status);
1651 goto bail;
1652 }
1653
1654 /* links can never be larger than one cluster so we know this
1655 * is all going to be contiguous, but do a sanity check
1656 * anyway. */
1657 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1658 status = -EIO;
1659 mlog_errno(status);
1660 goto bail;
1661 }
1662
1663 virtual = 0;
1664 while(bytes_left > 0) {
1665 c = &symname[virtual * sb->s_blocksize];
1666
1667 bhs[virtual] = sb_getblk(sb, p_blkno);
1668 if (!bhs[virtual]) {
1669 status = -ENOMEM;
1670 mlog_errno(status);
1671 goto bail;
1672 }
1673 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode),
1674 bhs[virtual]);
1675
1676 status = ocfs2_journal_access(handle, INODE_CACHE(inode),
1677 bhs[virtual],
1678 OCFS2_JOURNAL_ACCESS_CREATE);
1679 if (status < 0) {
1680 mlog_errno(status);
1681 goto bail;
1682 }
1683
1684 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1685
1686 memcpy(bhs[virtual]->b_data, c,
1687 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1688 bytes_left);
1689
1690 ocfs2_journal_dirty(handle, bhs[virtual]);
1691
1692 virtual++;
1693 p_blkno++;
1694 bytes_left -= sb->s_blocksize;
1695 }
1696
1697 status = 0;
1698bail:
1699
1700 if (bhs) {
1701 for(i = 0; i < blocks; i++)
1702 brelse(bhs[i]);
1703 kfree(bhs);
1704 }
1705
1706 if (status)
1707 mlog_errno(status);
1708 return status;
1709}
1710
1711static int ocfs2_symlink(struct inode *dir,
1712 struct dentry *dentry,
1713 const char *symname)
1714{
1715 int status, l, credits;
1716 u64 newsize;
1717 struct ocfs2_super *osb = NULL;
1718 struct inode *inode = NULL;
1719 struct super_block *sb;
1720 struct buffer_head *new_fe_bh = NULL;
1721 struct buffer_head *parent_fe_bh = NULL;
1722 struct ocfs2_dinode *fe = NULL;
1723 struct ocfs2_dinode *dirfe;
1724 handle_t *handle = NULL;
1725 struct ocfs2_alloc_context *inode_ac = NULL;
1726 struct ocfs2_alloc_context *data_ac = NULL;
1727 struct ocfs2_alloc_context *xattr_ac = NULL;
1728 int want_clusters = 0;
1729 int xattr_credits = 0;
1730 struct ocfs2_security_xattr_info si = {
1731 .enable = 1,
1732 };
1733 int did_quota = 0, did_quota_inode = 0;
1734 struct ocfs2_dir_lookup_result lookup = { NULL, };
1735 sigset_t oldset;
1736 int did_block_signals = 0;
1737
1738 trace_ocfs2_symlink_begin(dir, dentry, symname,
1739 dentry->d_name.len, dentry->d_name.name);
1740
1741 dquot_initialize(dir);
1742
1743 sb = dir->i_sb;
1744 osb = OCFS2_SB(sb);
1745
1746 l = strlen(symname) + 1;
1747
1748 credits = ocfs2_calc_symlink_credits(sb);
1749
1750 /* lock the parent directory */
1751 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1752 if (status < 0) {
1753 if (status != -ENOENT)
1754 mlog_errno(status);
1755 return status;
1756 }
1757
1758 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1759 if (!ocfs2_read_links_count(dirfe)) {
1760 /* can't make a file in a deleted directory. */
1761 status = -ENOENT;
1762 goto bail;
1763 }
1764
1765 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1766 dentry->d_name.len);
1767 if (status)
1768 goto bail;
1769
1770 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1771 dentry->d_name.name,
1772 dentry->d_name.len, &lookup);
1773 if (status < 0) {
1774 mlog_errno(status);
1775 goto bail;
1776 }
1777
1778 status = ocfs2_reserve_new_inode(osb, &inode_ac);
1779 if (status < 0) {
1780 if (status != -ENOSPC)
1781 mlog_errno(status);
1782 goto bail;
1783 }
1784
1785 inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
1786 if (!inode) {
1787 status = -ENOMEM;
1788 mlog_errno(status);
1789 goto bail;
1790 }
1791
1792 /* get security xattr */
1793 status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
1794 if (status) {
1795 if (status == -EOPNOTSUPP)
1796 si.enable = 0;
1797 else {
1798 mlog_errno(status);
1799 goto bail;
1800 }
1801 }
1802
1803 /* calculate meta data/clusters for setting security xattr */
1804 if (si.enable) {
1805 status = ocfs2_calc_security_init(dir, &si, &want_clusters,
1806 &xattr_credits, &xattr_ac);
1807 if (status < 0) {
1808 mlog_errno(status);
1809 goto bail;
1810 }
1811 }
1812
1813 /* don't reserve bitmap space for fast symlinks. */
1814 if (l > ocfs2_fast_symlink_chars(sb))
1815 want_clusters += 1;
1816
1817 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
1818 if (status < 0) {
1819 if (status != -ENOSPC)
1820 mlog_errno(status);
1821 goto bail;
1822 }
1823
1824 handle = ocfs2_start_trans(osb, credits + xattr_credits);
1825 if (IS_ERR(handle)) {
1826 status = PTR_ERR(handle);
1827 handle = NULL;
1828 mlog_errno(status);
1829 goto bail;
1830 }
1831
1832 /* Starting to change things, restart is no longer possible. */
1833 ocfs2_block_signals(&oldset);
1834 did_block_signals = 1;
1835
1836 status = dquot_alloc_inode(inode);
1837 if (status)
1838 goto bail;
1839 did_quota_inode = 1;
1840
1841 trace_ocfs2_symlink_create(dir, dentry, dentry->d_name.len,
1842 dentry->d_name.name,
1843 (unsigned long long)OCFS2_I(dir)->ip_blkno,
1844 inode->i_mode);
1845
1846 status = ocfs2_mknod_locked(osb, dir, inode,
1847 0, &new_fe_bh, parent_fe_bh, handle,
1848 inode_ac);
1849 if (status < 0) {
1850 mlog_errno(status);
1851 goto bail;
1852 }
1853
1854 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1855 inode->i_rdev = 0;
1856 newsize = l - 1;
1857 inode->i_op = &ocfs2_symlink_inode_operations;
1858 if (l > ocfs2_fast_symlink_chars(sb)) {
1859 u32 offset = 0;
1860
1861 status = dquot_alloc_space_nodirty(inode,
1862 ocfs2_clusters_to_bytes(osb->sb, 1));
1863 if (status)
1864 goto bail;
1865 did_quota = 1;
1866 inode->i_mapping->a_ops = &ocfs2_aops;
1867 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
1868 new_fe_bh,
1869 handle, data_ac, NULL,
1870 NULL);
1871 if (status < 0) {
1872 if (status != -ENOSPC && status != -EINTR) {
1873 mlog(ML_ERROR,
1874 "Failed to extend file to %llu\n",
1875 (unsigned long long)newsize);
1876 mlog_errno(status);
1877 status = -ENOSPC;
1878 }
1879 goto bail;
1880 }
1881 i_size_write(inode, newsize);
1882 inode->i_blocks = ocfs2_inode_sector_count(inode);
1883 } else {
1884 inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
1885 memcpy((char *) fe->id2.i_symlink, symname, l);
1886 i_size_write(inode, newsize);
1887 inode->i_blocks = 0;
1888 }
1889
1890 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1891 if (status < 0) {
1892 mlog_errno(status);
1893 goto bail;
1894 }
1895
1896 if (!ocfs2_inode_is_fast_symlink(inode)) {
1897 status = ocfs2_create_symlink_data(osb, handle, inode,
1898 symname);
1899 if (status < 0) {
1900 mlog_errno(status);
1901 goto bail;
1902 }
1903 }
1904
1905 if (si.enable) {
1906 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
1907 xattr_ac, data_ac);
1908 if (status < 0) {
1909 mlog_errno(status);
1910 goto bail;
1911 }
1912 }
1913
1914 /*
1915 * Do this before adding the entry to the directory. We add
1916 * also set d_op after success so that ->d_iput() will cleanup
1917 * the dentry lock even if ocfs2_add_entry() fails below.
1918 */
1919 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
1920 if (status) {
1921 mlog_errno(status);
1922 goto bail;
1923 }
1924
1925 status = ocfs2_add_entry(handle, dentry, inode,
1926 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1927 &lookup);
1928 if (status < 0) {
1929 mlog_errno(status);
1930 goto bail;
1931 }
1932
1933 insert_inode_hash(inode);
1934 d_instantiate(dentry, inode);
1935bail:
1936 if (status < 0 && did_quota)
1937 dquot_free_space_nodirty(inode,
1938 ocfs2_clusters_to_bytes(osb->sb, 1));
1939 if (status < 0 && did_quota_inode)
1940 dquot_free_inode(inode);
1941 if (handle)
1942 ocfs2_commit_trans(osb, handle);
1943
1944 ocfs2_inode_unlock(dir, 1);
1945 if (did_block_signals)
1946 ocfs2_unblock_signals(&oldset);
1947
1948 brelse(new_fe_bh);
1949 brelse(parent_fe_bh);
1950 kfree(si.value);
1951 ocfs2_free_dir_lookup_result(&lookup);
1952 if (inode_ac)
1953 ocfs2_free_alloc_context(inode_ac);
1954 if (data_ac)
1955 ocfs2_free_alloc_context(data_ac);
1956 if (xattr_ac)
1957 ocfs2_free_alloc_context(xattr_ac);
1958 if ((status < 0) && inode) {
1959 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
1960 clear_nlink(inode);
1961 iput(inode);
1962 }
1963
1964 if (status)
1965 mlog_errno(status);
1966
1967 return status;
1968}
1969
1970static int ocfs2_blkno_stringify(u64 blkno, char *name)
1971{
1972 int status, namelen;
1973
1974 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
1975 (long long)blkno);
1976 if (namelen <= 0) {
1977 if (namelen)
1978 status = namelen;
1979 else
1980 status = -EINVAL;
1981 mlog_errno(status);
1982 goto bail;
1983 }
1984 if (namelen != OCFS2_ORPHAN_NAMELEN) {
1985 status = -EINVAL;
1986 mlog_errno(status);
1987 goto bail;
1988 }
1989
1990 trace_ocfs2_blkno_stringify(blkno, name, namelen);
1991
1992 status = 0;
1993bail:
1994 if (status < 0)
1995 mlog_errno(status);
1996 return status;
1997}
1998
1999static int ocfs2_lookup_lock_orphan_dir(struct ocfs2_super *osb,
2000 struct inode **ret_orphan_dir,
2001 struct buffer_head **ret_orphan_dir_bh)
2002{
2003 struct inode *orphan_dir_inode;
2004 struct buffer_head *orphan_dir_bh = NULL;
2005 int ret = 0;
2006
2007 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2008 ORPHAN_DIR_SYSTEM_INODE,
2009 osb->slot_num);
2010 if (!orphan_dir_inode) {
2011 ret = -ENOENT;
2012 mlog_errno(ret);
2013 return ret;
2014 }
2015
2016 mutex_lock(&orphan_dir_inode->i_mutex);
2017
2018 ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2019 if (ret < 0) {
2020 mutex_unlock(&orphan_dir_inode->i_mutex);
2021 iput(orphan_dir_inode);
2022
2023 mlog_errno(ret);
2024 return ret;
2025 }
2026
2027 *ret_orphan_dir = orphan_dir_inode;
2028 *ret_orphan_dir_bh = orphan_dir_bh;
2029
2030 return 0;
2031}
2032
2033static int __ocfs2_prepare_orphan_dir(struct inode *orphan_dir_inode,
2034 struct buffer_head *orphan_dir_bh,
2035 u64 blkno,
2036 char *name,
2037 struct ocfs2_dir_lookup_result *lookup)
2038{
2039 int ret;
2040 struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);
2041
2042 ret = ocfs2_blkno_stringify(blkno, name);
2043 if (ret < 0) {
2044 mlog_errno(ret);
2045 return ret;
2046 }
2047
2048 ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2049 orphan_dir_bh, name,
2050 OCFS2_ORPHAN_NAMELEN, lookup);
2051 if (ret < 0) {
2052 mlog_errno(ret);
2053 return ret;
2054 }
2055
2056 return 0;
2057}
2058
2059/**
2060 * ocfs2_prepare_orphan_dir() - Prepare an orphan directory for
2061 * insertion of an orphan.
2062 * @osb: ocfs2 file system
2063 * @ret_orphan_dir: Orphan dir inode - returned locked!
2064 * @blkno: Actual block number of the inode to be inserted into orphan dir.
2065 * @lookup: dir lookup result, to be passed back into functions like
2066 * ocfs2_orphan_add
2067 *
2068 * Returns zero on success and the ret_orphan_dir, name and lookup
2069 * fields will be populated.
2070 *
2071 * Returns non-zero on failure.
2072 */
2073static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2074 struct inode **ret_orphan_dir,
2075 u64 blkno,
2076 char *name,
2077 struct ocfs2_dir_lookup_result *lookup)
2078{
2079 struct inode *orphan_dir_inode = NULL;
2080 struct buffer_head *orphan_dir_bh = NULL;
2081 int ret = 0;
2082
2083 ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode,
2084 &orphan_dir_bh);
2085 if (ret < 0) {
2086 mlog_errno(ret);
2087 return ret;
2088 }
2089
2090 ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh,
2091 blkno, name, lookup);
2092 if (ret < 0) {
2093 mlog_errno(ret);
2094 goto out;
2095 }
2096
2097 *ret_orphan_dir = orphan_dir_inode;
2098
2099out:
2100 brelse(orphan_dir_bh);
2101
2102 if (ret) {
2103 ocfs2_inode_unlock(orphan_dir_inode, 1);
2104 mutex_unlock(&orphan_dir_inode->i_mutex);
2105 iput(orphan_dir_inode);
2106 }
2107
2108 if (ret)
2109 mlog_errno(ret);
2110 return ret;
2111}
2112
2113static int ocfs2_orphan_add(struct ocfs2_super *osb,
2114 handle_t *handle,
2115 struct inode *inode,
2116 struct buffer_head *fe_bh,
2117 char *name,
2118 struct ocfs2_dir_lookup_result *lookup,
2119 struct inode *orphan_dir_inode)
2120{
2121 struct buffer_head *orphan_dir_bh = NULL;
2122 int status = 0;
2123 struct ocfs2_dinode *orphan_fe;
2124 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
2125
2126 trace_ocfs2_orphan_add_begin(
2127 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2128
2129 status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
2130 if (status < 0) {
2131 mlog_errno(status);
2132 goto leave;
2133 }
2134
2135 status = ocfs2_journal_access_di(handle,
2136 INODE_CACHE(orphan_dir_inode),
2137 orphan_dir_bh,
2138 OCFS2_JOURNAL_ACCESS_WRITE);
2139 if (status < 0) {
2140 mlog_errno(status);
2141 goto leave;
2142 }
2143
2144 /*
2145 * We're going to journal the change of i_flags and i_orphaned_slot.
2146 * It's safe anyway, though some callers may duplicate the journaling.
2147 * Journaling within the func just make the logic look more
2148 * straightforward.
2149 */
2150 status = ocfs2_journal_access_di(handle,
2151 INODE_CACHE(inode),
2152 fe_bh,
2153 OCFS2_JOURNAL_ACCESS_WRITE);
2154 if (status < 0) {
2155 mlog_errno(status);
2156 goto leave;
2157 }
2158
2159 /* we're a cluster, and nlink can change on disk from
2160 * underneath us... */
2161 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2162 if (S_ISDIR(inode->i_mode))
2163 ocfs2_add_links_count(orphan_fe, 1);
2164 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2165 ocfs2_journal_dirty(handle, orphan_dir_bh);
2166
2167 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2168 OCFS2_ORPHAN_NAMELEN, inode,
2169 OCFS2_I(inode)->ip_blkno,
2170 orphan_dir_bh, lookup);
2171 if (status < 0) {
2172 mlog_errno(status);
2173 goto rollback;
2174 }
2175
2176 fe->i_flags |= cpu_to_le32(OCFS2_ORPHANED_FL);
2177 OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR;
2178
2179 /* Record which orphan dir our inode now resides
2180 * in. delete_inode will use this to determine which orphan
2181 * dir to lock. */
2182 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
2183
2184 ocfs2_journal_dirty(handle, fe_bh);
2185
2186 trace_ocfs2_orphan_add_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
2187 osb->slot_num);
2188
2189rollback:
2190 if (status < 0) {
2191 if (S_ISDIR(inode->i_mode))
2192 ocfs2_add_links_count(orphan_fe, -1);
2193 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2194 }
2195
2196leave:
2197 brelse(orphan_dir_bh);
2198
2199 return status;
2200}
2201
2202/* unlike orphan_add, we expect the orphan dir to already be locked here. */
2203int ocfs2_orphan_del(struct ocfs2_super *osb,
2204 handle_t *handle,
2205 struct inode *orphan_dir_inode,
2206 struct inode *inode,
2207 struct buffer_head *orphan_dir_bh)
2208{
2209 char name[OCFS2_ORPHAN_NAMELEN + 1];
2210 struct ocfs2_dinode *orphan_fe;
2211 int status = 0;
2212 struct ocfs2_dir_lookup_result lookup = { NULL, };
2213
2214 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2215 if (status < 0) {
2216 mlog_errno(status);
2217 goto leave;
2218 }
2219
2220 trace_ocfs2_orphan_del(
2221 (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2222 name, OCFS2_ORPHAN_NAMELEN);
2223
2224 /* find it's spot in the orphan directory */
2225 status = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, orphan_dir_inode,
2226 &lookup);
2227 if (status) {
2228 mlog_errno(status);
2229 goto leave;
2230 }
2231
2232 /* remove it from the orphan directory */
2233 status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup);
2234 if (status < 0) {
2235 mlog_errno(status);
2236 goto leave;
2237 }
2238
2239 status = ocfs2_journal_access_di(handle,
2240 INODE_CACHE(orphan_dir_inode),
2241 orphan_dir_bh,
2242 OCFS2_JOURNAL_ACCESS_WRITE);
2243 if (status < 0) {
2244 mlog_errno(status);
2245 goto leave;
2246 }
2247
2248 /* do the i_nlink dance! :) */
2249 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2250 if (S_ISDIR(inode->i_mode))
2251 ocfs2_add_links_count(orphan_fe, -1);
2252 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2253 ocfs2_journal_dirty(handle, orphan_dir_bh);
2254
2255leave:
2256 ocfs2_free_dir_lookup_result(&lookup);
2257
2258 if (status)
2259 mlog_errno(status);
2260 return status;
2261}
2262
2263/**
2264 * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to receive a newly
2265 * allocated file. This is different from the typical 'add to orphan dir'
2266 * operation in that the inode does not yet exist. This is a problem because
2267 * the orphan dir stringifies the inode block number to come up with it's
2268 * dirent. Obviously if the inode does not yet exist we have a chicken and egg
2269 * problem. This function works around it by calling deeper into the orphan
2270 * and suballoc code than other callers. Use this only by necessity.
2271 * @dir: The directory which this inode will ultimately wind up under - not the
2272 * orphan dir!
2273 * @dir_bh: buffer_head the @dir inode block
2274 * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled
2275 * with the string to be used for orphan dirent. Pass back to the orphan dir
2276 * code.
2277 * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan
2278 * dir code.
2279 * @ret_di_blkno: block number where the new inode will be allocated.
2280 * @orphan_insert: Dir insert context to be passed back into orphan dir code.
2281 * @ret_inode_ac: Inode alloc context to be passed back to the allocator.
2282 *
2283 * Returns zero on success and the ret_orphan_dir, name and lookup
2284 * fields will be populated.
2285 *
2286 * Returns non-zero on failure.
2287 */
2288static int ocfs2_prep_new_orphaned_file(struct inode *dir,
2289 struct buffer_head *dir_bh,
2290 char *orphan_name,
2291 struct inode **ret_orphan_dir,
2292 u64 *ret_di_blkno,
2293 struct ocfs2_dir_lookup_result *orphan_insert,
2294 struct ocfs2_alloc_context **ret_inode_ac)
2295{
2296 int ret;
2297 u64 di_blkno;
2298 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2299 struct inode *orphan_dir = NULL;
2300 struct buffer_head *orphan_dir_bh = NULL;
2301 struct ocfs2_alloc_context *inode_ac = NULL;
2302
2303 ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh);
2304 if (ret < 0) {
2305 mlog_errno(ret);
2306 return ret;
2307 }
2308
2309 /* reserve an inode spot */
2310 ret = ocfs2_reserve_new_inode(osb, &inode_ac);
2311 if (ret < 0) {
2312 if (ret != -ENOSPC)
2313 mlog_errno(ret);
2314 goto out;
2315 }
2316
2317 ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
2318 &di_blkno);
2319 if (ret) {
2320 mlog_errno(ret);
2321 goto out;
2322 }
2323
2324 ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
2325 di_blkno, orphan_name, orphan_insert);
2326 if (ret < 0) {
2327 mlog_errno(ret);
2328 goto out;
2329 }
2330
2331out:
2332 if (ret == 0) {
2333 *ret_orphan_dir = orphan_dir;
2334 *ret_di_blkno = di_blkno;
2335 *ret_inode_ac = inode_ac;
2336 /*
2337 * orphan_name and orphan_insert are already up to
2338 * date via prepare_orphan_dir
2339 */
2340 } else {
2341 /* Unroll reserve_new_inode* */
2342 if (inode_ac)
2343 ocfs2_free_alloc_context(inode_ac);
2344
2345 /* Unroll orphan dir locking */
2346 mutex_unlock(&orphan_dir->i_mutex);
2347 ocfs2_inode_unlock(orphan_dir, 1);
2348 iput(orphan_dir);
2349 }
2350
2351 brelse(orphan_dir_bh);
2352
2353 return ret;
2354}
2355
2356int ocfs2_create_inode_in_orphan(struct inode *dir,
2357 int mode,
2358 struct inode **new_inode)
2359{
2360 int status, did_quota_inode = 0;
2361 struct inode *inode = NULL;
2362 struct inode *orphan_dir = NULL;
2363 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2364 struct ocfs2_dinode *di = NULL;
2365 handle_t *handle = NULL;
2366 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
2367 struct buffer_head *parent_di_bh = NULL;
2368 struct buffer_head *new_di_bh = NULL;
2369 struct ocfs2_alloc_context *inode_ac = NULL;
2370 struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2371 u64 uninitialized_var(di_blkno), suballoc_loc;
2372 u16 suballoc_bit;
2373
2374 status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2375 if (status < 0) {
2376 if (status != -ENOENT)
2377 mlog_errno(status);
2378 return status;
2379 }
2380
2381 status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
2382 orphan_name, &orphan_dir,
2383 &di_blkno, &orphan_insert, &inode_ac);
2384 if (status < 0) {
2385 if (status != -ENOSPC)
2386 mlog_errno(status);
2387 goto leave;
2388 }
2389
2390 inode = ocfs2_get_init_inode(dir, mode);
2391 if (!inode) {
2392 status = -ENOMEM;
2393 mlog_errno(status);
2394 goto leave;
2395 }
2396
2397 handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
2398 if (IS_ERR(handle)) {
2399 status = PTR_ERR(handle);
2400 handle = NULL;
2401 mlog_errno(status);
2402 goto leave;
2403 }
2404
2405 status = dquot_alloc_inode(inode);
2406 if (status)
2407 goto leave;
2408 did_quota_inode = 1;
2409
2410 status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
2411 &suballoc_loc,
2412 &suballoc_bit, di_blkno);
2413 if (status < 0) {
2414 mlog_errno(status);
2415 goto leave;
2416 }
2417
2418 clear_nlink(inode);
2419 /* do the real work now. */
2420 status = __ocfs2_mknod_locked(dir, inode,
2421 0, &new_di_bh, parent_di_bh, handle,
2422 inode_ac, di_blkno, suballoc_loc,
2423 suballoc_bit);
2424 if (status < 0) {
2425 mlog_errno(status);
2426 goto leave;
2427 }
2428
2429 di = (struct ocfs2_dinode *)new_di_bh->b_data;
2430 status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
2431 &orphan_insert, orphan_dir);
2432 if (status < 0) {
2433 mlog_errno(status);
2434 goto leave;
2435 }
2436
2437 /* get open lock so that only nodes can't remove it from orphan dir. */
2438 status = ocfs2_open_lock(inode);
2439 if (status < 0)
2440 mlog_errno(status);
2441
2442 insert_inode_hash(inode);
2443leave:
2444 if (status < 0 && did_quota_inode)
2445 dquot_free_inode(inode);
2446 if (handle)
2447 ocfs2_commit_trans(osb, handle);
2448
2449 if (orphan_dir) {
2450 /* This was locked for us in ocfs2_prepare_orphan_dir() */
2451 ocfs2_inode_unlock(orphan_dir, 1);
2452 mutex_unlock(&orphan_dir->i_mutex);
2453 iput(orphan_dir);
2454 }
2455
2456 if ((status < 0) && inode) {
2457 clear_nlink(inode);
2458 iput(inode);
2459 }
2460
2461 if (inode_ac)
2462 ocfs2_free_alloc_context(inode_ac);
2463
2464 brelse(new_di_bh);
2465
2466 if (!status)
2467 *new_inode = inode;
2468
2469 ocfs2_free_dir_lookup_result(&orphan_insert);
2470
2471 ocfs2_inode_unlock(dir, 1);
2472 brelse(parent_di_bh);
2473 return status;
2474}
2475
2476int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
2477 struct inode *inode,
2478 struct dentry *dentry)
2479{
2480 int status = 0;
2481 struct buffer_head *parent_di_bh = NULL;
2482 handle_t *handle = NULL;
2483 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2484 struct ocfs2_dinode *dir_di, *di;
2485 struct inode *orphan_dir_inode = NULL;
2486 struct buffer_head *orphan_dir_bh = NULL;
2487 struct buffer_head *di_bh = NULL;
2488 struct ocfs2_dir_lookup_result lookup = { NULL, };
2489
2490 trace_ocfs2_mv_orphaned_inode_to_new(dir, dentry,
2491 dentry->d_name.len, dentry->d_name.name,
2492 (unsigned long long)OCFS2_I(dir)->ip_blkno,
2493 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2494
2495 status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2496 if (status < 0) {
2497 if (status != -ENOENT)
2498 mlog_errno(status);
2499 return status;
2500 }
2501
2502 dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
2503 if (!dir_di->i_links_count) {
2504 /* can't make a file in a deleted directory. */
2505 status = -ENOENT;
2506 goto leave;
2507 }
2508
2509 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
2510 dentry->d_name.len);
2511 if (status)
2512 goto leave;
2513
2514 /* get a spot inside the dir. */
2515 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_di_bh,
2516 dentry->d_name.name,
2517 dentry->d_name.len, &lookup);
2518 if (status < 0) {
2519 mlog_errno(status);
2520 goto leave;
2521 }
2522
2523 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2524 ORPHAN_DIR_SYSTEM_INODE,
2525 osb->slot_num);
2526 if (!orphan_dir_inode) {
2527 status = -EEXIST;
2528 mlog_errno(status);
2529 goto leave;
2530 }
2531
2532 mutex_lock(&orphan_dir_inode->i_mutex);
2533
2534 status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2535 if (status < 0) {
2536 mlog_errno(status);
2537 mutex_unlock(&orphan_dir_inode->i_mutex);
2538 iput(orphan_dir_inode);
2539 goto leave;
2540 }
2541
2542 status = ocfs2_read_inode_block(inode, &di_bh);
2543 if (status < 0) {
2544 mlog_errno(status);
2545 goto orphan_unlock;
2546 }
2547
2548 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
2549 if (IS_ERR(handle)) {
2550 status = PTR_ERR(handle);
2551 handle = NULL;
2552 mlog_errno(status);
2553 goto orphan_unlock;
2554 }
2555
2556 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
2557 di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2558 if (status < 0) {
2559 mlog_errno(status);
2560 goto out_commit;
2561 }
2562
2563 status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
2564 orphan_dir_bh);
2565 if (status < 0) {
2566 mlog_errno(status);
2567 goto out_commit;
2568 }
2569
2570 di = (struct ocfs2_dinode *)di_bh->b_data;
2571 di->i_flags &= ~cpu_to_le32(OCFS2_ORPHANED_FL);
2572 di->i_orphaned_slot = 0;
2573 set_nlink(inode, 1);
2574 ocfs2_set_links_count(di, inode->i_nlink);
2575 ocfs2_update_inode_fsync_trans(handle, inode, 1);
2576 ocfs2_journal_dirty(handle, di_bh);
2577
2578 status = ocfs2_add_entry(handle, dentry, inode,
2579 OCFS2_I(inode)->ip_blkno, parent_di_bh,
2580 &lookup);
2581 if (status < 0) {
2582 mlog_errno(status);
2583 goto out_commit;
2584 }
2585
2586 status = ocfs2_dentry_attach_lock(dentry, inode,
2587 OCFS2_I(dir)->ip_blkno);
2588 if (status) {
2589 mlog_errno(status);
2590 goto out_commit;
2591 }
2592
2593 d_instantiate(dentry, inode);
2594 status = 0;
2595out_commit:
2596 ocfs2_commit_trans(osb, handle);
2597orphan_unlock:
2598 ocfs2_inode_unlock(orphan_dir_inode, 1);
2599 mutex_unlock(&orphan_dir_inode->i_mutex);
2600 iput(orphan_dir_inode);
2601leave:
2602
2603 ocfs2_inode_unlock(dir, 1);
2604
2605 brelse(di_bh);
2606 brelse(parent_di_bh);
2607 brelse(orphan_dir_bh);
2608
2609 ocfs2_free_dir_lookup_result(&lookup);
2610
2611 if (status)
2612 mlog_errno(status);
2613
2614 return status;
2615}
2616
2617const struct inode_operations ocfs2_dir_iops = {
2618 .create = ocfs2_create,
2619 .lookup = ocfs2_lookup,
2620 .link = ocfs2_link,
2621 .unlink = ocfs2_unlink,
2622 .rmdir = ocfs2_unlink,
2623 .symlink = ocfs2_symlink,
2624 .mkdir = ocfs2_mkdir,
2625 .mknod = ocfs2_mknod,
2626 .rename = ocfs2_rename,
2627 .setattr = ocfs2_setattr,
2628 .getattr = ocfs2_getattr,
2629 .permission = ocfs2_permission,
2630 .setxattr = generic_setxattr,
2631 .getxattr = generic_getxattr,
2632 .listxattr = ocfs2_listxattr,
2633 .removexattr = generic_removexattr,
2634 .fiemap = ocfs2_fiemap,
2635 .get_acl = ocfs2_iop_get_acl,
2636 .set_acl = ocfs2_iop_set_acl,
2637};
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