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[PATCH] OCFS2: The Second Oracle Cluster Filesystem
[mirror_ubuntu-bionic-kernel.git] / fs / ocfs2 / namei.c
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ccd979bd
MF		 1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * namei.c
5 *
6 * Create and rename file, directory, symlinks
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * Portions of this code from linux/fs/ext3/dir.c
11 *
12 * Copyright (C) 1992, 1993, 1994, 1995
13 * Remy Card (card@masi.ibp.fr)
14 * Laboratoire MASI - Institut Blaise pascal
15 * Universite Pierre et Marie Curie (Paris VI)
16 *
17 * from
18 *
19 * linux/fs/minix/dir.c
20 *
21 * Copyright (C) 1991, 1992 Linux Torvalds
22 *
23 * This program is free software; you can redistribute it and/or
24 * modify it under the terms of the GNU General Public
25 * License as published by the Free Software Foundation; either
26 * version 2 of the License, or (at your option) any later version.
27 *
28 * This program is distributed in the hope that it will be useful,
29 * but WITHOUT ANY WARRANTY; without even the implied warranty of
30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
31 * General Public License for more details.
32 *
33 * You should have received a copy of the GNU General Public
34 * License along with this program; if not, write to the
35 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
36 * Boston, MA 021110-1307, USA.
37 */
38
39#include <linux/fs.h>
40#include <linux/types.h>
41#include <linux/slab.h>
42#include <linux/highmem.h>
43
44#define MLOG_MASK_PREFIX ML_NAMEI
45#include <cluster/masklog.h>
46
47#include "ocfs2.h"
48
49#include "alloc.h"
50#include "dcache.h"
51#include "dir.h"
52#include "dlmglue.h"
53#include "extent_map.h"
54#include "file.h"
55#include "inode.h"
56#include "journal.h"
57#include "namei.h"
58#include "suballoc.h"
59#include "symlink.h"
60#include "sysfile.h"
61#include "uptodate.h"
62#include "vote.h"
63
64#include "buffer_head_io.h"
65
66#define NAMEI_RA_CHUNKS 2
67#define NAMEI_RA_BLOCKS 4
68#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
69#define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
70
71static int inline ocfs2_search_dirblock(struct buffer_head *bh,
72 struct inode *dir,
73 const char *name, int namelen,
74 unsigned long offset,
75 struct ocfs2_dir_entry **res_dir);
76
77static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle,
78 struct inode *dir,
79 struct ocfs2_dir_entry *de_del,
80 struct buffer_head *bh);
81
82static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle,
83 struct inode *dir,
84 const char *name, int namelen,
85 struct inode *inode, u64 blkno,
86 struct buffer_head *parent_fe_bh,
87 struct buffer_head *insert_bh);
88
89static int ocfs2_mknod_locked(struct ocfs2_super *osb,
90 struct inode *dir,
91 struct dentry *dentry, int mode,
92 dev_t dev,
93 struct buffer_head **new_fe_bh,
94 struct buffer_head *parent_fe_bh,
95 struct ocfs2_journal_handle *handle,
96 struct inode **ret_inode,
97 struct ocfs2_alloc_context *inode_ac);
98
99static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
100 struct ocfs2_journal_handle *handle,
101 struct inode *parent,
102 struct inode *inode,
103 struct buffer_head *fe_bh,
104 struct ocfs2_alloc_context *data_ac);
105
106static int ocfs2_double_lock(struct ocfs2_super *osb,
107 struct ocfs2_journal_handle *handle,
108 struct buffer_head **bh1,
109 struct inode *inode1,
110 struct buffer_head **bh2,
111 struct inode *inode2);
112
113static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
114 struct ocfs2_journal_handle *handle,
115 struct inode *inode,
116 char *name,
117 struct buffer_head **de_bh);
118
119static int ocfs2_orphan_add(struct ocfs2_super *osb,
120 struct ocfs2_journal_handle *handle,
121 struct inode *inode,
122 struct ocfs2_dinode *fe,
123 char *name,
124 struct buffer_head *de_bh);
125
126static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
127 struct ocfs2_journal_handle *handle,
128 struct inode *inode,
129 const char *symname);
130
131static inline int ocfs2_add_entry(struct ocfs2_journal_handle *handle,
132 struct dentry *dentry,
133 struct inode *inode, u64 blkno,
134 struct buffer_head *parent_fe_bh,
135 struct buffer_head *insert_bh)
136{
137 return __ocfs2_add_entry(handle, dentry->d_parent->d_inode,
138 dentry->d_name.name, dentry->d_name.len,
139 inode, blkno, parent_fe_bh, insert_bh);
140}
141
142/* An orphan dir name is an 8 byte value, printed as a hex string */
143#define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
144
145static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
146 struct nameidata *nd)
147{
148 int status;
149 u64 blkno;
150 struct buffer_head *dirent_bh = NULL;
151 struct inode *inode = NULL;
152 struct dentry *ret;
153 struct ocfs2_dir_entry *dirent;
154 struct ocfs2_inode_info *oi;
155
156 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
157 dentry->d_name.len, dentry->d_name.name);
158
159 if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
160 ret = ERR_PTR(-ENAMETOOLONG);
161 goto bail;
162 }
163
164 mlog(0, "find name %.*s in directory %"MLFu64"\n", dentry->d_name.len,
165 dentry->d_name.name, OCFS2_I(dir)->ip_blkno);
166
167 status = ocfs2_meta_lock(dir, NULL, NULL, 0);
168 if (status < 0) {
169 if (status != -ENOENT)
170 mlog_errno(status);
171 ret = ERR_PTR(status);
172 goto bail;
173 }
174
175 status = ocfs2_find_files_on_disk(dentry->d_name.name,
176 dentry->d_name.len, &blkno,
177 dir, &dirent_bh, &dirent);
178 if (status < 0)
179 goto bail_add;
180
181 inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno);
182 if (IS_ERR(inode)) {
183 mlog(ML_ERROR, "Unable to create inode %"MLFu64"\n", blkno);
184 ret = ERR_PTR(-EACCES);
185 goto bail_unlock;
186 }
187
188 oi = OCFS2_I(inode);
189 /* Clear any orphaned state... If we were able to look up the
190 * inode from a directory, it certainly can't be orphaned. We
191 * might have the bad state from a node which intended to
192 * orphan this inode but crashed before it could commit the
193 * unlink. */
194 spin_lock(&oi->ip_lock);
195 oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
196 oi->ip_orphaned_slot = OCFS2_INVALID_SLOT;
197 spin_unlock(&oi->ip_lock);
198
199bail_add:
200
201 dentry->d_op = &ocfs2_dentry_ops;
202 ret = d_splice_alias(inode, dentry);
203
204bail_unlock:
205 /* Don't drop the cluster lock until *after* the d_add --
206 * unlink on another node will message us to remove that
207 * dentry under this lock so otherwise we can race this with
208 * the vote thread and have a stale dentry. */
209 ocfs2_meta_unlock(dir, 0);
210
211bail:
212 if (dirent_bh)
213 brelse(dirent_bh);
214
215 mlog_exit_ptr(ret);
216
217 return ret;
218}
219
220static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
221 struct ocfs2_journal_handle *handle,
222 struct inode *parent,
223 struct inode *inode,
224 struct buffer_head *fe_bh,
225 struct ocfs2_alloc_context *data_ac)
226{
227 int status;
228 struct buffer_head *new_bh = NULL;
229 struct ocfs2_dir_entry *de = NULL;
230
231 mlog_entry_void();
232
233 status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
234 data_ac, NULL, &new_bh);
235 if (status < 0) {
236 mlog_errno(status);
237 goto bail;
238 }
239
240 ocfs2_set_new_buffer_uptodate(inode, new_bh);
241
242 status = ocfs2_journal_access(handle, inode, new_bh,
243 OCFS2_JOURNAL_ACCESS_CREATE);
244 if (status < 0) {
245 mlog_errno(status);
246 goto bail;
247 }
248 memset(new_bh->b_data, 0, osb->sb->s_blocksize);
249
250 de = (struct ocfs2_dir_entry *) new_bh->b_data;
251 de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
252 de->name_len = 1;
253 de->rec_len =
254 cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
255 strcpy(de->name, ".");
256 ocfs2_set_de_type(de, S_IFDIR);
257 de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
258 de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
259 de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize -
260 OCFS2_DIR_REC_LEN(1));
261 de->name_len = 2;
262 strcpy(de->name, "..");
263 ocfs2_set_de_type(de, S_IFDIR);
264
265 status = ocfs2_journal_dirty(handle, new_bh);
266 if (status < 0) {
267 mlog_errno(status);
268 goto bail;
269 }
270
271 i_size_write(inode, inode->i_sb->s_blocksize);
272 inode->i_nlink = 2;
273 inode->i_blocks = ocfs2_align_bytes_to_sectors(inode->i_sb->s_blocksize);
274 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
275 if (status < 0) {
276 mlog_errno(status);
277 goto bail;
278 }
279
280 status = 0;
281bail:
282 if (new_bh)
283 brelse(new_bh);
284
285 mlog_exit(status);
286 return status;
287}
288
289static int ocfs2_mknod(struct inode *dir,
290 struct dentry *dentry,
291 int mode,
292 dev_t dev)
293{
294 int status = 0;
295 struct buffer_head *parent_fe_bh = NULL;
296 struct ocfs2_journal_handle *handle = NULL;
297 struct ocfs2_super *osb;
298 struct ocfs2_dinode *dirfe;
299 struct buffer_head *new_fe_bh = NULL;
300 struct buffer_head *de_bh = NULL;
301 struct inode *inode = NULL;
302 struct ocfs2_alloc_context *inode_ac = NULL;
303 struct ocfs2_alloc_context *data_ac = NULL;
304
305 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
306 (unsigned long)dev, dentry->d_name.len,
307 dentry->d_name.name);
308
309 /* get our super block */
310 osb = OCFS2_SB(dir->i_sb);
311
312 if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
313 mlog(ML_ERROR, "inode %"MLFu64" has i_nlink of %u\n",
314 OCFS2_I(dir)->ip_blkno, dir->i_nlink);
315 status = -EMLINK;
316 goto leave;
317 }
318
319 handle = ocfs2_alloc_handle(osb);
320 if (handle == NULL) {
321 status = -ENOMEM;
322 mlog_errno(status);
323 goto leave;
324 }
325
326 status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
327 if (status < 0) {
328 if (status != -ENOENT)
329 mlog_errno(status);
330 goto leave;
331 }
332
333 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
334 if (!dirfe->i_links_count) {
335 /* can't make a file in a deleted directory. */
336 status = -ENOENT;
337 goto leave;
338 }
339
340 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
341 dentry->d_name.len);
342 if (status)
343 goto leave;
344
345 /* get a spot inside the dir. */
346 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
347 dentry->d_name.name,
348 dentry->d_name.len, &de_bh);
349 if (status < 0) {
350 mlog_errno(status);
351 goto leave;
352 }
353
354 /* reserve an inode spot */
355 status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
356 if (status < 0) {
357 if (status != -ENOSPC)
358 mlog_errno(status);
359 goto leave;
360 }
361
362 /* are we making a directory? If so, reserve a cluster for his
363 * 1st extent. */
364 if (S_ISDIR(mode)) {
365 status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
366 if (status < 0) {
367 if (status != -ENOSPC)
368 mlog_errno(status);
369 goto leave;
370 }
371 }
372
373 handle = ocfs2_start_trans(osb, handle, OCFS2_MKNOD_CREDITS);
374 if (IS_ERR(handle)) {
375 status = PTR_ERR(handle);
376 handle = NULL;
377 mlog_errno(status);
378 goto leave;
379 }
380
381 /* do the real work now. */
382 status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
383 &new_fe_bh, parent_fe_bh, handle,
384 &inode, inode_ac);
385 if (status < 0) {
386 mlog_errno(status);
387 goto leave;
388 }
389
390 if (S_ISDIR(mode)) {
391 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
392 new_fe_bh, data_ac);
393 if (status < 0) {
394 mlog_errno(status);
395 goto leave;
396 }
397
398 status = ocfs2_journal_access(handle, dir, parent_fe_bh,
399 OCFS2_JOURNAL_ACCESS_WRITE);
400 if (status < 0) {
401 mlog_errno(status);
402 goto leave;
403 }
404 le16_add_cpu(&dirfe->i_links_count, 1);
405 status = ocfs2_journal_dirty(handle, parent_fe_bh);
406 if (status < 0) {
407 mlog_errno(status);
408 goto leave;
409 }
410 dir->i_nlink++;
411 }
412
413 status = ocfs2_add_entry(handle, dentry, inode,
414 OCFS2_I(inode)->ip_blkno, parent_fe_bh,
415 de_bh);
416 if (status < 0) {
417 mlog_errno(status);
418 goto leave;
419 }
420
421 insert_inode_hash(inode);
422 dentry->d_op = &ocfs2_dentry_ops;
423 d_instantiate(dentry, inode);
424 status = 0;
425leave:
426 if (handle)
427 ocfs2_commit_trans(handle);
428
429 if (status == -ENOSPC)
430 mlog(0, "Disk is full\n");
431
432 if (new_fe_bh)
433 brelse(new_fe_bh);
434
435 if (de_bh)
436 brelse(de_bh);
437
438 if (parent_fe_bh)
439 brelse(parent_fe_bh);
440
441 if ((status < 0) && inode)
442 iput(inode);
443
444 if (inode_ac)
445 ocfs2_free_alloc_context(inode_ac);
446
447 if (data_ac)
448 ocfs2_free_alloc_context(data_ac);
449
450 mlog_exit(status);
451
452 return status;
453}
454
455static int ocfs2_mknod_locked(struct ocfs2_super *osb,
456 struct inode *dir,
457 struct dentry *dentry, int mode,
458 dev_t dev,
459 struct buffer_head **new_fe_bh,
460 struct buffer_head *parent_fe_bh,
461 struct ocfs2_journal_handle *handle,
462 struct inode **ret_inode,
463 struct ocfs2_alloc_context *inode_ac)
464{
465 int status = 0;
466 struct ocfs2_dinode *fe = NULL;
467 struct ocfs2_extent_list *fel;
468 u64 fe_blkno = 0;
469 u16 suballoc_bit;
470 struct inode *inode = NULL;
471
472 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
473 (unsigned long)dev, dentry->d_name.len,
474 dentry->d_name.name);
475
476 *new_fe_bh = NULL;
477 *ret_inode = NULL;
478
479 status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
480 &fe_blkno);
481 if (status < 0) {
482 mlog_errno(status);
483 goto leave;
484 }
485
486 inode = new_inode(dir->i_sb);
487 if (IS_ERR(inode)) {
488 status = PTR_ERR(inode);
489 mlog(ML_ERROR, "new_inode failed!\n");
490 goto leave;
491 }
492
493 /* populate as many fields early on as possible - many of
494 * these are used by the support functions here and in
495 * callers. */
496 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
497 OCFS2_I(inode)->ip_blkno = fe_blkno;
498 if (S_ISDIR(mode))
499 inode->i_nlink = 2;
500 else
501 inode->i_nlink = 1;
502 inode->i_mode = mode;
503 spin_lock(&osb->osb_lock);
504 inode->i_generation = osb->s_next_generation++;
505 spin_unlock(&osb->osb_lock);
506
507 *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
508 if (!*new_fe_bh) {
509 status = -EIO;
510 mlog_errno(status);
511 goto leave;
512 }
513 ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
514
515 status = ocfs2_journal_access(handle, inode, *new_fe_bh,
516 OCFS2_JOURNAL_ACCESS_CREATE);
517 if (status < 0) {
518 mlog_errno(status);
519 goto leave;
520 }
521
522 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
523 memset(fe, 0, osb->sb->s_blocksize);
524
525 fe->i_generation = cpu_to_le32(inode->i_generation);
526 fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
527 fe->i_blkno = cpu_to_le64(fe_blkno);
528 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
529 fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
530 fe->i_uid = cpu_to_le32(current->fsuid);
531 if (dir->i_mode & S_ISGID) {
532 fe->i_gid = cpu_to_le32(dir->i_gid);
533 if (S_ISDIR(mode))
534 mode |= S_ISGID;
535 } else
536 fe->i_gid = cpu_to_le32(current->fsgid);
537 fe->i_mode = cpu_to_le16(mode);
538 if (S_ISCHR(mode) || S_ISBLK(mode))
539 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
540
541 fe->i_links_count = cpu_to_le16(inode->i_nlink);
542
543 fe->i_last_eb_blk = 0;
544 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
545 le32_add_cpu(&fe->i_flags, 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 fel = &fe->id2.i_list;
553 fel->l_tree_depth = 0;
554 fel->l_next_free_rec = 0;
555 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
556
557 status = ocfs2_journal_dirty(handle, *new_fe_bh);
558 if (status < 0) {
559 mlog_errno(status);
560 goto leave;
561 }
562
563 if (ocfs2_populate_inode(inode, fe, 1) < 0) {
564 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
565 "i_blkno=%"MLFu64", i_ino=%lu\n",
566 (unsigned long long) (*new_fe_bh)->b_blocknr,
567 fe->i_blkno, inode->i_ino);
568 BUG();
569 }
570
571 ocfs2_inode_set_new(osb, inode);
572 status = ocfs2_create_new_inode_locks(inode);
573 if (status < 0)
574 mlog_errno(status);
575
576 status = 0; /* error in ocfs2_create_new_inode_locks is not
577 * critical */
578
579 *ret_inode = inode;
580leave:
581 if (status < 0) {
582 if (*new_fe_bh) {
583 brelse(*new_fe_bh);
584 *new_fe_bh = NULL;
585 }
586 if (inode)
587 iput(inode);
588 }
589
590 mlog_exit(status);
591 return status;
592}
593
594static int ocfs2_mkdir(struct inode *dir,
595 struct dentry *dentry,
596 int mode)
597{
598 int ret;
599
600 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
601 dentry->d_name.len, dentry->d_name.name);
602 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
603 mlog_exit(ret);
604
605 return ret;
606}
607
608static int ocfs2_create(struct inode *dir,
609 struct dentry *dentry,
610 int mode,
611 struct nameidata *nd)
612{
613 int ret;
614
615 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
616 dentry->d_name.len, dentry->d_name.name);
617 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
618 mlog_exit(ret);
619
620 return ret;
621}
622
623static int ocfs2_link(struct dentry *old_dentry,
624 struct inode *dir,
625 struct dentry *dentry)
626{
627 struct ocfs2_journal_handle *handle = NULL;
628 struct inode *inode = old_dentry->d_inode;
629 int err;
630 struct buffer_head *fe_bh = NULL;
631 struct buffer_head *parent_fe_bh = NULL;
632 struct buffer_head *de_bh = NULL;
633 struct ocfs2_dinode *fe = NULL;
634 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
635
636 mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
637 old_dentry->d_name.len, old_dentry->d_name.name,
638 dentry->d_name.len, dentry->d_name.name);
639
640 if (S_ISDIR(inode->i_mode)) {
641 err = -EPERM;
642 goto bail;
643 }
644
645 if (inode->i_nlink >= OCFS2_LINK_MAX) {
646 err = -EMLINK;
647 goto bail;
648 }
649
650 handle = ocfs2_alloc_handle(osb);
651 if (handle == NULL) {
652 err = -ENOMEM;
653 goto bail;
654 }
655
656 err = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
657 if (err < 0) {
658 if (err != -ENOENT)
659 mlog_errno(err);
660 goto bail;
661 }
662
663 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
664 dentry->d_name.len);
665 if (err)
666 goto bail;
667
668 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
669 dentry->d_name.name,
670 dentry->d_name.len, &de_bh);
671 if (err < 0) {
672 mlog_errno(err);
673 goto bail;
674 }
675
676 err = ocfs2_meta_lock(inode, handle, &fe_bh, 1);
677 if (err < 0) {
678 if (err != -ENOENT)
679 mlog_errno(err);
680 goto bail;
681 }
682
683 fe = (struct ocfs2_dinode *) fe_bh->b_data;
684 if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
685 err = -EMLINK;
686 goto bail;
687 }
688
689 handle = ocfs2_start_trans(osb, handle, OCFS2_LINK_CREDITS);
690 if (IS_ERR(handle)) {
691 err = PTR_ERR(handle);
692 handle = NULL;
693 mlog_errno(err);
694 goto bail;
695 }
696
697 err = ocfs2_journal_access(handle, inode, fe_bh,
698 OCFS2_JOURNAL_ACCESS_WRITE);
699 if (err < 0) {
700 mlog_errno(err);
701 goto bail;
702 }
703
704 inode->i_nlink++;
705 inode->i_ctime = CURRENT_TIME;
706 fe->i_links_count = cpu_to_le16(inode->i_nlink);
707 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
708 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
709
710 err = ocfs2_journal_dirty(handle, fe_bh);
711 if (err < 0) {
712 le16_add_cpu(&fe->i_links_count, -1);
713 inode->i_nlink--;
714 mlog_errno(err);
715 goto bail;
716 }
717
718 err = ocfs2_add_entry(handle, dentry, inode,
719 OCFS2_I(inode)->ip_blkno,
720 parent_fe_bh, de_bh);
721 if (err) {
722 le16_add_cpu(&fe->i_links_count, -1);
723 inode->i_nlink--;
724 mlog_errno(err);
725 goto bail;
726 }
727
728 atomic_inc(&inode->i_count);
729 dentry->d_op = &ocfs2_dentry_ops;
730 d_instantiate(dentry, inode);
731bail:
732 if (handle)
733 ocfs2_commit_trans(handle);
734 if (de_bh)
735 brelse(de_bh);
736 if (fe_bh)
737 brelse(fe_bh);
738 if (parent_fe_bh)
739 brelse(parent_fe_bh);
740
741 mlog_exit(err);
742
743 return err;
744}
745
746static int ocfs2_unlink(struct inode *dir,
747 struct dentry *dentry)
748{
749 int status;
750 unsigned int saved_nlink = 0;
751 struct inode *inode = dentry->d_inode;
752 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
753 u64 blkno;
754 struct ocfs2_dinode *fe = NULL;
755 struct buffer_head *fe_bh = NULL;
756 struct buffer_head *parent_node_bh = NULL;
757 struct ocfs2_journal_handle *handle = NULL;
758 struct ocfs2_dir_entry *dirent = NULL;
759 struct buffer_head *dirent_bh = NULL;
760 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
761 struct buffer_head *orphan_entry_bh = NULL;
762
763 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
764 dentry->d_name.len, dentry->d_name.name);
765
766 BUG_ON(dentry->d_parent->d_inode != dir);
767
768 mlog(0, "ino = %"MLFu64"\n", OCFS2_I(inode)->ip_blkno);
769
770 if (inode == osb->root_inode) {
771 mlog(0, "Cannot delete the root directory\n");
772 status = -EPERM;
773 goto leave;
774 }
775
776 handle = ocfs2_alloc_handle(osb);
777 if (handle == NULL) {
778 status = -ENOMEM;
779 mlog_errno(status);
780 goto leave;
781 }
782
783 status = ocfs2_meta_lock(dir, handle, &parent_node_bh, 1);
784 if (status < 0) {
785 if (status != -ENOENT)
786 mlog_errno(status);
787 goto leave;
788 }
789
790 status = ocfs2_find_files_on_disk(dentry->d_name.name,
791 dentry->d_name.len, &blkno,
792 dir, &dirent_bh, &dirent);
793 if (status < 0) {
794 if (status != -ENOENT)
795 mlog_errno(status);
796 goto leave;
797 }
798
799 if (OCFS2_I(inode)->ip_blkno != blkno) {
800 status = -ENOENT;
801
802 mlog(0, "ip_blkno (%"MLFu64") != dirent blkno (%"MLFu64") "
803 "ip_flags = %x\n", OCFS2_I(inode)->ip_blkno, blkno,
804 OCFS2_I(inode)->ip_flags);
805 goto leave;
806 }
807
808 status = ocfs2_meta_lock(inode, handle, &fe_bh, 1);
809 if (status < 0) {
810 if (status != -ENOENT)
811 mlog_errno(status);
812 goto leave;
813 }
814
815 if (S_ISDIR(inode->i_mode)) {
816 if (!ocfs2_empty_dir(inode)) {
817 status = -ENOTEMPTY;
818 goto leave;
819 } else if (inode->i_nlink != 2) {
820 status = -ENOTEMPTY;
821 goto leave;
822 }
823 }
824
825 /* There are still a few steps left until we can consider the
826 * unlink to have succeeded. Save off nlink here before
827 * modification so we can set it back in case we hit an issue
828 * before commit. */
829 saved_nlink = inode->i_nlink;
830 if (S_ISDIR(inode->i_mode))
831 inode->i_nlink = 0;
832 else
833 inode->i_nlink--;
834
835 status = ocfs2_request_unlink_vote(inode, dentry,
836 (unsigned int) inode->i_nlink);
837 if (status < 0) {
838 /* This vote should succeed under all normal
839 * circumstances. */
840 mlog_errno(status);
841 goto leave;
842 }
843
844 if (!inode->i_nlink) {
845 status = ocfs2_prepare_orphan_dir(osb, handle, inode,
846 orphan_name,
847 &orphan_entry_bh);
848 if (status < 0) {
849 mlog_errno(status);
850 goto leave;
851 }
852 }
853
854 handle = ocfs2_start_trans(osb, handle, OCFS2_UNLINK_CREDITS);
855 if (IS_ERR(handle)) {
856 status = PTR_ERR(handle);
857 handle = NULL;
858 mlog_errno(status);
859 goto leave;
860 }
861
862 status = ocfs2_journal_access(handle, inode, fe_bh,
863 OCFS2_JOURNAL_ACCESS_WRITE);
864 if (status < 0) {
865 mlog_errno(status);
866 goto leave;
867 }
868
869 fe = (struct ocfs2_dinode *) fe_bh->b_data;
870
871 if (!inode->i_nlink) {
872 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
873 orphan_entry_bh);
874 if (status < 0) {
875 mlog_errno(status);
876 goto leave;
877 }
878 }
879
880 /* delete the name from the parent dir */
881 status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
882 if (status < 0) {
883 mlog_errno(status);
884 goto leave;
885 }
886
887 /* We can set nlink on the dinode now. clear the saved version
888 * so that it doesn't get set later. */
889 fe->i_links_count = cpu_to_le16(inode->i_nlink);
890 saved_nlink = 0;
891
892 status = ocfs2_journal_dirty(handle, fe_bh);
893 if (status < 0) {
894 mlog_errno(status);
895 goto leave;
896 }
897
898 if (S_ISDIR(inode->i_mode)) {
899 dir->i_nlink--;
900 status = ocfs2_mark_inode_dirty(handle, dir,
901 parent_node_bh);
902 if (status < 0) {
903 mlog_errno(status);
904 dir->i_nlink++;
905 }
906 }
907
908leave:
909 if (status < 0 && saved_nlink)
910 inode->i_nlink = saved_nlink;
911
912 if (handle)
913 ocfs2_commit_trans(handle);
914
915 if (fe_bh)
916 brelse(fe_bh);
917
918 if (dirent_bh)
919 brelse(dirent_bh);
920
921 if (parent_node_bh)
922 brelse(parent_node_bh);
923
924 if (orphan_entry_bh)
925 brelse(orphan_entry_bh);
926
927 mlog_exit(status);
928
929 return status;
930}
931
932/*
933 * The only place this should be used is rename!
934 * if they have the same id, then the 1st one is the only one locked.
935 */
936static int ocfs2_double_lock(struct ocfs2_super *osb,
937 struct ocfs2_journal_handle *handle,
938 struct buffer_head **bh1,
939 struct inode *inode1,
940 struct buffer_head **bh2,
941 struct inode *inode2)
942{
943 int status;
944 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
945 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
946 struct buffer_head **tmpbh;
947 struct inode *tmpinode;
948
949 mlog_entry("(inode1 = %"MLFu64", inode2 = %"MLFu64")\n",
950 oi1->ip_blkno, oi2->ip_blkno);
951
952 BUG_ON(!handle);
953
954 if (*bh1)
955 *bh1 = NULL;
956 if (*bh2)
957 *bh2 = NULL;
958
959 /* we always want to lock the one with the lower lockid first. */
960 if (oi1->ip_blkno != oi2->ip_blkno) {
961 if (oi1->ip_blkno < oi2->ip_blkno) {
962 /* switch id1 and id2 around */
963 mlog(0, "switching them around...\n");
964 tmpbh = bh2;
965 bh2 = bh1;
966 bh1 = tmpbh;
967
968 tmpinode = inode2;
969 inode2 = inode1;
970 inode1 = tmpinode;
971 }
972 /* lock id2 */
973 status = ocfs2_meta_lock(inode2, handle, bh2, 1);
974 if (status < 0) {
975 if (status != -ENOENT)
976 mlog_errno(status);
977 goto bail;
978 }
979 }
980 /* lock id1 */
981 status = ocfs2_meta_lock(inode1, handle, bh1, 1);
982 if (status < 0) {
983 if (status != -ENOENT)
984 mlog_errno(status);
985 goto bail;
986 }
987bail:
988 mlog_exit(status);
989 return status;
990}
991
992#define PARENT_INO(buffer) \
993 ((struct ocfs2_dir_entry *) \
994 ((char *)buffer + \
995 le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode
996
997static int ocfs2_rename(struct inode *old_dir,
998 struct dentry *old_dentry,
999 struct inode *new_dir,
1000 struct dentry *new_dentry)
1001{
1002 int status = 0, rename_lock = 0;
1003 struct inode *old_inode = old_dentry->d_inode;
1004 struct inode *new_inode = new_dentry->d_inode;
1005 struct ocfs2_dinode *newfe = NULL;
1006 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1007 struct buffer_head *orphan_entry_bh = NULL;
1008 struct buffer_head *newfe_bh = NULL;
1009 struct buffer_head *insert_entry_bh = NULL;
1010 struct ocfs2_super *osb = NULL;
1011 u64 newfe_blkno;
1012 struct ocfs2_journal_handle *handle = NULL;
1013 struct buffer_head *old_dir_bh = NULL;
1014 struct buffer_head *new_dir_bh = NULL;
1015 struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry
1016 // and new_dentry
1017 struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
1018 struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
1019 // this is the 1st dirent bh
1020 nlink_t old_dir_nlink = old_dir->i_nlink, new_dir_nlink = new_dir->i_nlink;
1021 unsigned int links_count;
1022
1023 /* At some point it might be nice to break this function up a
1024 * bit. */
1025
1026 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
1027 old_dir, old_dentry, new_dir, new_dentry,
1028 old_dentry->d_name.len, old_dentry->d_name.name,
1029 new_dentry->d_name.len, new_dentry->d_name.name);
1030
1031 osb = OCFS2_SB(old_dir->i_sb);
1032
1033 if (new_inode) {
1034 if (!igrab(new_inode))
1035 BUG();
1036 }
1037
1038 if (atomic_read(&old_dentry->d_count) > 2) {
1039 shrink_dcache_parent(old_dentry);
1040 if (atomic_read(&old_dentry->d_count) > 2) {
1041 status = -EBUSY;
1042 goto bail;
1043 }
1044 }
1045
1046 /* Assume a directory heirarchy thusly:
1047 * a/b/c
1048 * a/d
1049 * a,b,c, and d are all directories.
1050 *
1051 * from cwd of 'a' on both nodes:
1052 * node1: mv b/c d
1053 * node2: mv d b/c
1054 *
1055 * And that's why, just like the VFS, we need a file system
1056 * rename lock. */
1057 if (old_dentry != new_dentry) {
1058 status = ocfs2_rename_lock(osb);
1059 if (status < 0) {
1060 mlog_errno(status);
1061 goto bail;
1062 }
1063 rename_lock = 1;
1064 }
1065
1066 handle = ocfs2_alloc_handle(osb);
1067 if (handle == NULL) {
1068 status = -ENOMEM;
1069 mlog_errno(status);
1070 goto bail;
1071 }
1072
1073 /* if old and new are the same, this'll just do one lock. */
1074 status = ocfs2_double_lock(osb, handle,
1075 &old_dir_bh, old_dir,
1076 &new_dir_bh, new_dir);
1077 if (status < 0) {
1078 mlog_errno(status);
1079 goto bail;
1080 }
1081
1082 /* make sure both dirs have bhs
1083 * get an extra ref on old_dir_bh if old==new */
1084 if (!new_dir_bh) {
1085 if (old_dir_bh) {
1086 new_dir_bh = old_dir_bh;
1087 get_bh(new_dir_bh);
1088 } else {
1089 mlog(ML_ERROR, "no old_dir_bh!\n");
1090 status = -EIO;
1091 goto bail;
1092 }
1093 }
1094
1095 if (S_ISDIR(old_inode->i_mode)) {
1096 /* Directories actually require metadata updates to
1097 * the directory info so we can't get away with not
1098 * doing node locking on it. */
1099 status = ocfs2_meta_lock(old_inode, handle, NULL, 1);
1100 if (status < 0) {
1101 if (status != -ENOENT)
1102 mlog_errno(status);
1103 goto bail;
1104 }
1105
1106 status = ocfs2_request_rename_vote(old_inode, old_dentry);
1107 if (status < 0) {
1108 mlog_errno(status);
1109 goto bail;
1110 }
1111
1112 status = -EIO;
1113 old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0);
1114 if (!old_inode_de_bh)
1115 goto bail;
1116
1117 status = -EIO;
1118 if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) !=
1119 OCFS2_I(old_dir)->ip_blkno)
1120 goto bail;
1121 status = -EMLINK;
1122 if (!new_inode && new_dir!=old_dir &&
1123 new_dir->i_nlink >= OCFS2_LINK_MAX)
1124 goto bail;
1125 } else {
1126 /* Ah, the simple case - we're a file so just send a
1127 * message. */
1128 status = ocfs2_request_rename_vote(old_inode, old_dentry);
1129 if (status < 0) {
1130 mlog_errno(status);
1131 goto bail;
1132 }
1133 }
1134
1135 status = -ENOENT;
1136 old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
1137 old_dentry->d_name.len,
1138 old_dir, &old_de);
1139 if (!old_de_bh)
1140 goto bail;
1141
1142 /*
1143 * Check for inode number is _not_ due to possible IO errors.
1144 * We might rmdir the source, keep it as pwd of some process
1145 * and merrily kill the link to whatever was created under the
1146 * same name. Goodbye sticky bit ;-<
1147 */
1148 if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno)
1149 goto bail;
1150
1151 /* check if the target already exists (in which case we need
1152 * to delete it */
1153 status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1154 new_dentry->d_name.len,
1155 &newfe_blkno, new_dir, &new_de_bh,
1156 &new_de);
1157 /* The only error we allow here is -ENOENT because the new
1158 * file not existing is perfectly valid. */
1159 if ((status < 0) && (status != -ENOENT)) {
1160 /* If we cannot find the file specified we should just */
1161 /* return the error... */
1162 mlog_errno(status);
1163 goto bail;
1164 }
1165
1166 if (!new_de && new_inode)
1167 mlog(ML_ERROR, "inode %lu does not exist in it's parent "
1168 "directory!", new_inode->i_ino);
1169
1170 /* In case we need to overwrite an existing file, we blow it
1171 * away first */
1172 if (new_de) {
1173 /* VFS didn't think there existed an inode here, but
1174 * someone else in the cluster must have raced our
1175 * rename to create one. Today we error cleanly, in
1176 * the future we should consider calling iget to build
1177 * a new struct inode for this entry. */
1178 if (!new_inode) {
1179 status = -EACCES;
1180
1181 mlog(0, "We found an inode for name %.*s but VFS "
1182 "didn't give us one.\n", new_dentry->d_name.len,
1183 new_dentry->d_name.name);
1184 goto bail;
1185 }
1186
1187 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1188 status = -EACCES;
1189
1190 mlog(0, "Inode blkno (%"MLFu64") and dir (%"MLFu64") "
1191 "disagree. ip_flags = %x\n",
1192 OCFS2_I(new_inode)->ip_blkno, newfe_blkno,
1193 OCFS2_I(new_inode)->ip_flags);
1194 goto bail;
1195 }
1196
1197 status = ocfs2_meta_lock(new_inode, handle, &newfe_bh, 1);
1198 if (status < 0) {
1199 if (status != -ENOENT)
1200 mlog_errno(status);
1201 goto bail;
1202 }
1203
1204 if (S_ISDIR(new_inode->i_mode))
1205 links_count = 0;
1206 else
1207 links_count = (unsigned int) (new_inode->i_nlink - 1);
1208
1209 status = ocfs2_request_unlink_vote(new_inode, new_dentry,
1210 links_count);
1211 if (status < 0) {
1212 mlog_errno(status);
1213 goto bail;
1214 }
1215
1216 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1217
1218 mlog(0, "aha rename over existing... new_de=%p "
1219 "new_blkno=%"MLFu64" newfebh=%p bhblocknr=%llu\n",
1220 new_de, newfe_blkno, newfe_bh, newfe_bh ?
1221 (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1222
1223 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1224 status = ocfs2_prepare_orphan_dir(osb, handle,
1225 new_inode,
1226 orphan_name,
1227 &orphan_entry_bh);
1228 if (status < 0) {
1229 mlog_errno(status);
1230 goto bail;
1231 }
1232 }
1233 } else {
1234 BUG_ON(new_dentry->d_parent->d_inode != new_dir);
1235
1236 status = ocfs2_check_dir_for_entry(new_dir,
1237 new_dentry->d_name.name,
1238 new_dentry->d_name.len);
1239 if (status)
1240 goto bail;
1241
1242 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1243 new_dentry->d_name.name,
1244 new_dentry->d_name.len,
1245 &insert_entry_bh);
1246 if (status < 0) {
1247 mlog_errno(status);
1248 goto bail;
1249 }
1250 }
1251
1252 handle = ocfs2_start_trans(osb, handle, OCFS2_RENAME_CREDITS);
1253 if (IS_ERR(handle)) {
1254 status = PTR_ERR(handle);
1255 handle = NULL;
1256 mlog_errno(status);
1257 goto bail;
1258 }
1259
1260 if (new_de) {
1261 if (S_ISDIR(new_inode->i_mode)) {
1262 if (!ocfs2_empty_dir(new_inode) ||
1263 new_inode->i_nlink != 2) {
1264 status = -ENOTEMPTY;
1265 goto bail;
1266 }
1267 }
1268 status = ocfs2_journal_access(handle, new_inode, newfe_bh,
1269 OCFS2_JOURNAL_ACCESS_WRITE);
1270 if (status < 0) {
1271 mlog_errno(status);
1272 goto bail;
1273 }
1274
1275 if (S_ISDIR(new_inode->i_mode) ||
1276 (newfe->i_links_count == cpu_to_le16(1))){
1277 status = ocfs2_orphan_add(osb, handle, new_inode,
1278 newfe, orphan_name,
1279 orphan_entry_bh);
1280 if (status < 0) {
1281 mlog_errno(status);
1282 goto bail;
1283 }
1284 }
1285
1286 /* change the dirent to point to the correct inode */
1287 status = ocfs2_journal_access(handle, new_dir, new_de_bh,
1288 OCFS2_JOURNAL_ACCESS_WRITE);
1289 if (status < 0) {
1290 mlog_errno(status);
1291 goto bail;
1292 }
1293 new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno);
1294 new_de->file_type = old_de->file_type;
1295 new_dir->i_version++;
1296 status = ocfs2_journal_dirty(handle, new_de_bh);
1297 if (status < 0) {
1298 mlog_errno(status);
1299 goto bail;
1300 }
1301
1302 if (S_ISDIR(new_inode->i_mode))
1303 newfe->i_links_count = 0;
1304 else
1305 le16_add_cpu(&newfe->i_links_count, -1);
1306
1307 status = ocfs2_journal_dirty(handle, newfe_bh);
1308 if (status < 0) {
1309 mlog_errno(status);
1310 goto bail;
1311 }
1312 } else {
1313 /* if the name was not found in new_dir, add it now */
1314 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1315 OCFS2_I(old_inode)->ip_blkno,
1316 new_dir_bh, insert_entry_bh);
1317 }
1318
1319 old_inode->i_ctime = CURRENT_TIME;
1320 mark_inode_dirty(old_inode);
1321
1322 /* now that the name has been added to new_dir, remove the old name */
1323 status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
1324 if (status < 0) {
1325 mlog_errno(status);
1326 goto bail;
1327 }
1328
1329 if (new_inode) {
1330 new_inode->i_nlink--;
1331 new_inode->i_ctime = CURRENT_TIME;
1332 }
1333 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1334 if (old_inode_de_bh) {
1335 status = ocfs2_journal_access(handle, old_inode,
1336 old_inode_de_bh,
1337 OCFS2_JOURNAL_ACCESS_WRITE);
1338 PARENT_INO(old_inode_de_bh->b_data) =
1339 cpu_to_le64(OCFS2_I(new_dir)->ip_blkno);
1340 status = ocfs2_journal_dirty(handle, old_inode_de_bh);
1341 old_dir->i_nlink--;
1342 if (new_inode) {
1343 new_inode->i_nlink--;
1344 } else {
1345 new_dir->i_nlink++;
1346 mark_inode_dirty(new_dir);
1347 }
1348 }
1349 mark_inode_dirty(old_dir);
1350 if (new_inode)
1351 mark_inode_dirty(new_inode);
1352
1353 if (old_dir != new_dir)
1354 if (new_dir_nlink != new_dir->i_nlink) {
1355 if (!new_dir_bh) {
1356 mlog(ML_ERROR, "need to change nlink for new "
1357 "dir %"MLFu64" from %d to %d but bh is "
1358 "NULL\n", OCFS2_I(new_dir)->ip_blkno,
1359 (int)new_dir_nlink, new_dir->i_nlink);
1360 } else {
1361 struct ocfs2_dinode *fe;
1362 status = ocfs2_journal_access(handle,
1363 new_dir,
1364 new_dir_bh,
1365 OCFS2_JOURNAL_ACCESS_WRITE);
1366 fe = (struct ocfs2_dinode *) new_dir_bh->b_data;
1367 fe->i_links_count = cpu_to_le16(new_dir->i_nlink);
1368 status = ocfs2_journal_dirty(handle, new_dir_bh);
1369 }
1370 }
1371
1372 if (old_dir_nlink != old_dir->i_nlink) {
1373 if (!old_dir_bh) {
1374 mlog(ML_ERROR, "need to change nlink for old dir "
1375 "%"MLFu64" from %d to %d but bh is NULL!\n",
1376 OCFS2_I(old_dir)->ip_blkno,
1377 (int)old_dir_nlink,
1378 old_dir->i_nlink);
1379 } else {
1380 struct ocfs2_dinode *fe;
1381 status = ocfs2_journal_access(handle, old_dir,
1382 old_dir_bh,
1383 OCFS2_JOURNAL_ACCESS_WRITE);
1384 fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1385 fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
1386 status = ocfs2_journal_dirty(handle, old_dir_bh);
1387 }
1388 }
1389
1390 status = 0;
1391bail:
1392 if (rename_lock)
1393 ocfs2_rename_unlock(osb);
1394
1395 if (handle)
1396 ocfs2_commit_trans(handle);
1397
1398 if (new_inode)
1399 sync_mapping_buffers(old_inode->i_mapping);
1400
1401 if (new_inode)
1402 iput(new_inode);
1403 if (newfe_bh)
1404 brelse(newfe_bh);
1405 if (old_dir_bh)
1406 brelse(old_dir_bh);
1407 if (new_dir_bh)
1408 brelse(new_dir_bh);
1409 if (new_de_bh)
1410 brelse(new_de_bh);
1411 if (old_de_bh)
1412 brelse(old_de_bh);
1413 if (old_inode_de_bh)
1414 brelse(old_inode_de_bh);
1415 if (orphan_entry_bh)
1416 brelse(orphan_entry_bh);
1417 if (insert_entry_bh)
1418 brelse(insert_entry_bh);
1419
1420 mlog_exit(status);
1421
1422 return status;
1423}
1424
1425/*
1426 * we expect i_size = strlen(symname). Copy symname into the file
1427 * data, including the null terminator.
1428 */
1429static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1430 struct ocfs2_journal_handle *handle,
1431 struct inode *inode,
1432 const char *symname)
1433{
1434 struct buffer_head **bhs = NULL;
1435 const char *c;
1436 struct super_block *sb = osb->sb;
1437 u64 p_blkno;
1438 int p_blocks;
1439 int virtual, blocks, status, i, bytes_left;
1440
1441 bytes_left = i_size_read(inode) + 1;
1442 /* we can't trust i_blocks because we're actually going to
1443 * write i_size + 1 bytes. */
1444 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1445
1446 mlog_entry("i_blocks = %lu, i_size = %llu, blocks = %d\n",
1447 inode->i_blocks, i_size_read(inode), blocks);
1448
1449 /* Sanity check -- make sure we're going to fit. */
1450 if (bytes_left >
1451 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1452 status = -EIO;
1453 mlog_errno(status);
1454 goto bail;
1455 }
1456
1457 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1458 if (!bhs) {
1459 status = -ENOMEM;
1460 mlog_errno(status);
1461 goto bail;
1462 }
1463
1464 status = ocfs2_extent_map_get_blocks(inode, 0, 1, &p_blkno,
1465 &p_blocks);
1466 if (status < 0) {
1467 mlog_errno(status);
1468 goto bail;
1469 }
1470
1471 /* links can never be larger than one cluster so we know this
1472 * is all going to be contiguous, but do a sanity check
1473 * anyway. */
1474 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1475 status = -EIO;
1476 mlog_errno(status);
1477 goto bail;
1478 }
1479
1480 virtual = 0;
1481 while(bytes_left > 0) {
1482 c = &symname[virtual * sb->s_blocksize];
1483
1484 bhs[virtual] = sb_getblk(sb, p_blkno);
1485 if (!bhs[virtual]) {
1486 status = -ENOMEM;
1487 mlog_errno(status);
1488 goto bail;
1489 }
1490 ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
1491
1492 status = ocfs2_journal_access(handle, inode, bhs[virtual],
1493 OCFS2_JOURNAL_ACCESS_CREATE);
1494 if (status < 0) {
1495 mlog_errno(status);
1496 goto bail;
1497 }
1498
1499 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1500
1501 memcpy(bhs[virtual]->b_data, c,
1502 (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1503 bytes_left);
1504
1505 status = ocfs2_journal_dirty(handle, bhs[virtual]);
1506 if (status < 0) {
1507 mlog_errno(status);
1508 goto bail;
1509 }
1510
1511 virtual++;
1512 p_blkno++;
1513 bytes_left -= sb->s_blocksize;
1514 }
1515
1516 status = 0;
1517bail:
1518
1519 if (bhs) {
1520 for(i = 0; i < blocks; i++)
1521 if (bhs[i])
1522 brelse(bhs[i]);
1523 kfree(bhs);
1524 }
1525
1526 mlog_exit(status);
1527 return status;
1528}
1529
1530static int ocfs2_symlink(struct inode *dir,
1531 struct dentry *dentry,
1532 const char *symname)
1533{
1534 int status, l, credits;
1535 u64 newsize;
1536 struct ocfs2_super *osb = NULL;
1537 struct inode *inode = NULL;
1538 struct super_block *sb;
1539 struct buffer_head *new_fe_bh = NULL;
1540 struct buffer_head *de_bh = NULL;
1541 struct buffer_head *parent_fe_bh = NULL;
1542 struct ocfs2_dinode *fe = NULL;
1543 struct ocfs2_dinode *dirfe;
1544 struct ocfs2_journal_handle *handle = NULL;
1545 struct ocfs2_alloc_context *inode_ac = NULL;
1546 struct ocfs2_alloc_context *data_ac = NULL;
1547
1548 mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
1549 dentry, symname, dentry->d_name.len, dentry->d_name.name);
1550
1551 sb = dir->i_sb;
1552 osb = OCFS2_SB(sb);
1553
1554 l = strlen(symname) + 1;
1555
1556 credits = ocfs2_calc_symlink_credits(sb);
1557
1558 handle = ocfs2_alloc_handle(osb);
1559 if (handle == NULL) {
1560 status = -ENOMEM;
1561 mlog_errno(status);
1562 goto bail;
1563 }
1564
1565 /* lock the parent directory */
1566 status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1);
1567 if (status < 0) {
1568 if (status != -ENOENT)
1569 mlog_errno(status);
1570 goto bail;
1571 }
1572
1573 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1574 if (!dirfe->i_links_count) {
1575 /* can't make a file in a deleted directory. */
1576 status = -ENOENT;
1577 goto bail;
1578 }
1579
1580 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1581 dentry->d_name.len);
1582 if (status)
1583 goto bail;
1584
1585 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1586 dentry->d_name.name,
1587 dentry->d_name.len, &de_bh);
1588 if (status < 0) {
1589 mlog_errno(status);
1590 goto bail;
1591 }
1592
1593 status = ocfs2_reserve_new_inode(osb, handle, &inode_ac);
1594 if (status < 0) {
1595 if (status != -ENOSPC)
1596 mlog_errno(status);
1597 goto bail;
1598 }
1599
1600 /* don't reserve bitmap space for fast symlinks. */
1601 if (l > ocfs2_fast_symlink_chars(sb)) {
1602 status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac);
1603 if (status < 0) {
1604 if (status != -ENOSPC)
1605 mlog_errno(status);
1606 goto bail;
1607 }
1608 }
1609
1610 handle = ocfs2_start_trans(osb, handle, credits);
1611 if (IS_ERR(handle)) {
1612 status = PTR_ERR(handle);
1613 handle = NULL;
1614 mlog_errno(status);
1615 goto bail;
1616 }
1617
1618 status = ocfs2_mknod_locked(osb, dir, dentry,
1619 S_IFLNK | S_IRWXUGO, 0,
1620 &new_fe_bh, parent_fe_bh, handle,
1621 &inode, inode_ac);
1622 if (status < 0) {
1623 mlog_errno(status);
1624 goto bail;
1625 }
1626
1627 fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1628 inode->i_rdev = 0;
1629 newsize = l - 1;
1630 if (l > ocfs2_fast_symlink_chars(sb)) {
1631 inode->i_op = &ocfs2_symlink_inode_operations;
1632 status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh,
1633 handle, data_ac, NULL,
1634 NULL);
1635 if (status < 0) {
1636 if (status != -ENOSPC && status != -EINTR) {
1637 mlog(ML_ERROR, "Failed to extend file to "
1638 "%"MLFu64"\n",
1639 newsize);
1640 mlog_errno(status);
1641 status = -ENOSPC;
1642 }
1643 goto bail;
1644 }
1645 i_size_write(inode, newsize);
1646 inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize);
1647 } else {
1648 inode->i_op = &ocfs2_fast_symlink_inode_operations;
1649 memcpy((char *) fe->id2.i_symlink, symname, l);
1650 i_size_write(inode, newsize);
1651 inode->i_blocks = 0;
1652 }
1653
1654 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1655 if (status < 0) {
1656 mlog_errno(status);
1657 goto bail;
1658 }
1659
1660 if (!ocfs2_inode_is_fast_symlink(inode)) {
1661 status = ocfs2_create_symlink_data(osb, handle, inode,
1662 symname);
1663 if (status < 0) {
1664 mlog_errno(status);
1665 goto bail;
1666 }
1667 }
1668
1669 status = ocfs2_add_entry(handle, dentry, inode,
1670 le64_to_cpu(fe->i_blkno), parent_fe_bh,
1671 de_bh);
1672 if (status < 0) {
1673 mlog_errno(status);
1674 goto bail;
1675 }
1676
1677 insert_inode_hash(inode);
1678 dentry->d_op = &ocfs2_dentry_ops;
1679 d_instantiate(dentry, inode);
1680bail:
1681 if (handle)
1682 ocfs2_commit_trans(handle);
1683 if (new_fe_bh)
1684 brelse(new_fe_bh);
1685 if (parent_fe_bh)
1686 brelse(parent_fe_bh);
1687 if (de_bh)
1688 brelse(de_bh);
1689 if (inode_ac)
1690 ocfs2_free_alloc_context(inode_ac);
1691 if (data_ac)
1692 ocfs2_free_alloc_context(data_ac);
1693 if ((status < 0) && inode)
1694 iput(inode);
1695
1696 mlog_exit(status);
1697
1698 return status;
1699}
1700
1701int ocfs2_check_dir_entry(struct inode * dir,
1702 struct ocfs2_dir_entry * de,
1703 struct buffer_head * bh,
1704 unsigned long offset)
1705{
1706 const char *error_msg = NULL;
1707 const int rlen = le16_to_cpu(de->rec_len);
1708
1709 if (rlen < OCFS2_DIR_REC_LEN(1))
1710 error_msg = "rec_len is smaller than minimal";
1711 else if (rlen % 4 != 0)
1712 error_msg = "rec_len % 4 != 0";
1713 else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
1714 error_msg = "rec_len is too small for name_len";
1715 else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
1716 error_msg = "directory entry across blocks";
1717
1718 if (error_msg != NULL)
1719 mlog(ML_ERROR, "bad entry in directory #%"MLFu64": %s - "
1720 "offset=%lu, inode=%"MLFu64", rec_len=%d, name_len=%d\n",
1721 OCFS2_I(dir)->ip_blkno, error_msg, offset,
1722 le64_to_cpu(de->inode), rlen, de->name_len);
1723 return error_msg == NULL ? 1 : 0;
1724}
1725
1726/* we don't always have a dentry for what we want to add, so people
1727 * like orphan dir can call this instead.
1728 *
1729 * If you pass me insert_bh, I'll skip the search of the other dir
1730 * blocks and put the record in there.
1731 */
1732static int __ocfs2_add_entry(struct ocfs2_journal_handle *handle,
1733 struct inode *dir,
1734 const char *name, int namelen,
1735 struct inode *inode, u64 blkno,
1736 struct buffer_head *parent_fe_bh,
1737 struct buffer_head *insert_bh)
1738{
1739 unsigned long offset;
1740 unsigned short rec_len;
1741 struct ocfs2_dir_entry *de, *de1;
1742 struct super_block *sb;
1743 int retval, status;
1744
1745 mlog_entry_void();
1746
1747 sb = dir->i_sb;
1748
1749 if (!namelen)
1750 return -EINVAL;
1751
1752 rec_len = OCFS2_DIR_REC_LEN(namelen);
1753 offset = 0;
1754 de = (struct ocfs2_dir_entry *) insert_bh->b_data;
1755 while (1) {
1756 BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data);
1757 /* These checks should've already been passed by the
1758 * prepare function, but I guess we can leave them
1759 * here anyway. */
1760 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
1761 retval = -ENOENT;
1762 goto bail;
1763 }
1764 if (ocfs2_match(namelen, name, de)) {
1765 retval = -EEXIST;
1766 goto bail;
1767 }
1768 if (((le64_to_cpu(de->inode) == 0) &&
1769 (le16_to_cpu(de->rec_len) >= rec_len)) ||
1770 (le16_to_cpu(de->rec_len) >=
1771 (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
1772 status = ocfs2_journal_access(handle, dir, insert_bh,
1773 OCFS2_JOURNAL_ACCESS_WRITE);
1774 /* By now the buffer is marked for journaling */
1775 offset += le16_to_cpu(de->rec_len);
1776 if (le64_to_cpu(de->inode)) {
1777 de1 = (struct ocfs2_dir_entry *)((char *) de +
1778 OCFS2_DIR_REC_LEN(de->name_len));
1779 de1->rec_len =
1780 cpu_to_le16(le16_to_cpu(de->rec_len) -
1781 OCFS2_DIR_REC_LEN(de->name_len));
1782 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
1783 de = de1;
1784 }
1785 de->file_type = OCFS2_FT_UNKNOWN;
1786 if (blkno) {
1787 de->inode = cpu_to_le64(blkno);
1788 ocfs2_set_de_type(de, inode->i_mode);
1789 } else
1790 de->inode = 0;
1791 de->name_len = namelen;
1792 memcpy(de->name, name, namelen);
1793
1794 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
1795 dir->i_version++;
1796 status = ocfs2_journal_dirty(handle, insert_bh);
1797 retval = 0;
1798 goto bail;
1799 }
1800 offset += le16_to_cpu(de->rec_len);
1801 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
1802 }
1803
1804 /* when you think about it, the assert above should prevent us
1805 * from ever getting here. */
1806 retval = -ENOSPC;
1807bail:
1808
1809 mlog_exit(retval);
1810 return retval;
1811}
1812
1813
1814/*
1815 * ocfs2_delete_entry deletes a directory entry by merging it with the
1816 * previous entry
1817 */
1818static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle,
1819 struct inode *dir,
1820 struct ocfs2_dir_entry *de_del,
1821 struct buffer_head *bh)
1822{
1823 struct ocfs2_dir_entry *de, *pde;
1824 int i, status = -ENOENT;
1825
1826 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
1827
1828 i = 0;
1829 pde = NULL;
1830 de = (struct ocfs2_dir_entry *) bh->b_data;
1831 while (i < bh->b_size) {
1832 if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
1833 status = -EIO;
1834 mlog_errno(status);
1835 goto bail;
1836 }
1837 if (de == de_del) {
1838 status = ocfs2_journal_access(handle, dir, bh,
1839 OCFS2_JOURNAL_ACCESS_WRITE);
1840 if (status < 0) {
1841 status = -EIO;
1842 mlog_errno(status);
1843 goto bail;
1844 }
1845 if (pde)
1846 pde->rec_len =
1847 cpu_to_le16(le16_to_cpu(pde->rec_len) +
1848 le16_to_cpu(de->rec_len));
1849 else
1850 de->inode = 0;
1851 dir->i_version++;
1852 status = ocfs2_journal_dirty(handle, bh);
1853 goto bail;
1854 }
1855 i += le16_to_cpu(de->rec_len);
1856 pde = de;
1857 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
1858 }
1859bail:
1860 mlog_exit(status);
1861 return status;
1862}
1863
1864/*
1865 * Returns 0 if not found, -1 on failure, and 1 on success
1866 */
1867static int inline ocfs2_search_dirblock(struct buffer_head *bh,
1868 struct inode *dir,
1869 const char *name, int namelen,
1870 unsigned long offset,
1871 struct ocfs2_dir_entry **res_dir)
1872{
1873 struct ocfs2_dir_entry *de;
1874 char *dlimit, *de_buf;
1875 int de_len;
1876 int ret = 0;
1877
1878 mlog_entry_void();
1879
1880 de_buf = bh->b_data;
1881 dlimit = de_buf + dir->i_sb->s_blocksize;
1882
1883 while (de_buf < dlimit) {
1884 /* this code is executed quadratically often */
1885 /* do minimal checking `by hand' */
1886
1887 de = (struct ocfs2_dir_entry *) de_buf;
1888
1889 if (de_buf + namelen <= dlimit &&
1890 ocfs2_match(namelen, name, de)) {
1891 /* found a match - just to be sure, do a full check */
1892 if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
1893 ret = -1;
1894 goto bail;
1895 }
1896 *res_dir = de;
1897 ret = 1;
1898 goto bail;
1899 }
1900
1901 /* prevent looping on a bad block */
1902 de_len = le16_to_cpu(de->rec_len);
1903 if (de_len <= 0) {
1904 ret = -1;
1905 goto bail;
1906 }
1907
1908 de_buf += de_len;
1909 offset += de_len;
1910 }
1911
1912bail:
1913 mlog_exit(ret);
1914 return ret;
1915}
1916
1917struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
1918 struct inode *dir,
1919 struct ocfs2_dir_entry **res_dir)
1920{
1921 struct super_block *sb;
1922 struct buffer_head *bh_use[NAMEI_RA_SIZE];
1923 struct buffer_head *bh, *ret = NULL;
1924 unsigned long start, block, b;
1925 int ra_max = 0; /* Number of bh's in the readahead
1926 buffer, bh_use[] */
1927 int ra_ptr = 0; /* Current index into readahead
1928 buffer */
1929 int num = 0;
1930 int nblocks, i, err;
1931
1932 mlog_entry_void();
1933
1934 *res_dir = NULL;
1935 sb = dir->i_sb;
1936
1937 nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
1938 start = OCFS2_I(dir)->ip_dir_start_lookup;
1939 if (start >= nblocks)
1940 start = 0;
1941 block = start;
1942
1943restart:
1944 do {
1945 /*
1946 * We deal with the read-ahead logic here.
1947 */
1948 if (ra_ptr >= ra_max) {
1949 /* Refill the readahead buffer */
1950 ra_ptr = 0;
1951 b = block;
1952 for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
1953 /*
1954 * Terminate if we reach the end of the
1955 * directory and must wrap, or if our
1956 * search has finished at this block.
1957 */
1958 if (b >= nblocks || (num && block == start)) {
1959 bh_use[ra_max] = NULL;
1960 break;
1961 }
1962 num++;
1963
1964 /* XXX: questionable readahead stuff here */
1965 bh = ocfs2_bread(dir, b++, &err, 1);
1966 bh_use[ra_max] = bh;
1967#if 0 // ???
1968 if (bh)
1969 ll_rw_block(READ, 1, &bh);
1970#endif
1971 }
1972 }
1973 if ((bh = bh_use[ra_ptr++]) == NULL)
1974 goto next;
1975 wait_on_buffer(bh);
1976 if (!buffer_uptodate(bh)) {
1977 /* read error, skip block & hope for the best */
1978 brelse(bh);
1979 goto next;
1980 }
1981 i = ocfs2_search_dirblock(bh, dir, name, namelen,
1982 block << sb->s_blocksize_bits,
1983 res_dir);
1984 if (i == 1) {
1985 OCFS2_I(dir)->ip_dir_start_lookup = block;
1986 ret = bh;
1987 goto cleanup_and_exit;
1988 } else {
1989 brelse(bh);
1990 if (i < 0)
1991 goto cleanup_and_exit;
1992 }
1993 next:
1994 if (++block >= nblocks)
1995 block = 0;
1996 } while (block != start);
1997
1998 /*
1999 * If the directory has grown while we were searching, then
2000 * search the last part of the directory before giving up.
2001 */
2002 block = nblocks;
2003 nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
2004 if (block < nblocks) {
2005 start = 0;
2006 goto restart;
2007 }
2008
2009cleanup_and_exit:
2010 /* Clean up the read-ahead blocks */
2011 for (; ra_ptr < ra_max; ra_ptr++)
2012 brelse(bh_use[ra_ptr]);
2013
2014 mlog_exit_ptr(ret);
2015 return ret;
2016}
2017
2018static int ocfs2_blkno_stringify(u64 blkno, char *name)
2019{
2020 int status, namelen;
2021
2022 mlog_entry_void();
2023
2024 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016"MLFx64,
2025 blkno);
2026 if (namelen <= 0) {
2027 if (namelen)
2028 status = namelen;
2029 else
2030 status = -EINVAL;
2031 mlog_errno(status);
2032 goto bail;
2033 }
2034 if (namelen != OCFS2_ORPHAN_NAMELEN) {
2035 status = -EINVAL;
2036 mlog_errno(status);
2037 goto bail;
2038 }
2039
2040 mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
2041 namelen);
2042
2043 status = 0;
2044bail:
2045 mlog_exit(status);
2046 return status;
2047}
2048
2049static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2050 struct ocfs2_journal_handle *handle,
2051 struct inode *inode,
2052 char *name,
2053 struct buffer_head **de_bh)
2054{
2055 struct inode *orphan_dir_inode = NULL;
2056 struct buffer_head *orphan_dir_bh = NULL;
2057 int status = 0;
2058
2059 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2060 if (status < 0) {
2061 mlog_errno(status);
2062 goto leave;
2063 }
2064
2065 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2066 ORPHAN_DIR_SYSTEM_INODE,
2067 osb->slot_num);
2068 if (!orphan_dir_inode) {
2069 status = -ENOENT;
2070 mlog_errno(status);
2071 goto leave;
2072 }
2073
2074 ocfs2_handle_add_inode(handle, orphan_dir_inode);
2075 status = ocfs2_meta_lock(orphan_dir_inode, handle, &orphan_dir_bh, 1);
2076 if (status < 0) {
2077 mlog_errno(status);
2078 goto leave;
2079 }
2080
2081 status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2082 orphan_dir_bh, name,
2083 OCFS2_ORPHAN_NAMELEN, de_bh);
2084 if (status < 0) {
2085 mlog_errno(status);
2086 goto leave;
2087 }
2088
2089leave:
2090 if (orphan_dir_inode)
2091 iput(orphan_dir_inode);
2092
2093 if (orphan_dir_bh)
2094 brelse(orphan_dir_bh);
2095
2096 mlog_exit(status);
2097 return status;
2098}
2099
2100static int ocfs2_orphan_add(struct ocfs2_super *osb,
2101 struct ocfs2_journal_handle *handle,
2102 struct inode *inode,
2103 struct ocfs2_dinode *fe,
2104 char *name,
2105 struct buffer_head *de_bh)
2106{
2107 struct inode *orphan_dir_inode = NULL;
2108 struct buffer_head *orphan_dir_bh = NULL;
2109 int status = 0;
2110 struct ocfs2_dinode *orphan_fe;
2111
2112 mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
2113
2114 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2115 ORPHAN_DIR_SYSTEM_INODE,
2116 osb->slot_num);
2117 if (!orphan_dir_inode) {
2118 status = -ENOENT;
2119 mlog_errno(status);
2120 goto leave;
2121 }
2122
2123 status = ocfs2_read_block(osb,
2124 OCFS2_I(orphan_dir_inode)->ip_blkno,
2125 &orphan_dir_bh, OCFS2_BH_CACHED,
2126 orphan_dir_inode);
2127 if (status < 0) {
2128 mlog_errno(status);
2129 goto leave;
2130 }
2131
2132 status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
2133 OCFS2_JOURNAL_ACCESS_WRITE);
2134 if (status < 0) {
2135 mlog_errno(status);
2136 goto leave;
2137 }
2138
2139 /* we're a cluster, and nlink can change on disk from
2140 * underneath us... */
2141 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2142 if (S_ISDIR(inode->i_mode))
2143 le16_add_cpu(&orphan_fe->i_links_count, 1);
2144 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2145
2146 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2147 if (status < 0) {
2148 mlog_errno(status);
2149 goto leave;
2150 }
2151
2152 status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2153 OCFS2_ORPHAN_NAMELEN, inode,
2154 OCFS2_I(inode)->ip_blkno,
2155 orphan_dir_bh, de_bh);
2156 if (status < 0) {
2157 mlog_errno(status);
2158 goto leave;
2159 }
2160
2161 le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
2162
2163 /* Record which orphan dir our inode now resides
2164 * in. delete_inode will use this to determine which orphan
2165 * dir to lock. */
2166 spin_lock(&OCFS2_I(inode)->ip_lock);
2167 OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num;
2168 spin_unlock(&OCFS2_I(inode)->ip_lock);
2169
2170 mlog(0, "Inode %"MLFu64" orphaned in slot %d\n",
2171 OCFS2_I(inode)->ip_blkno, osb->slot_num);
2172
2173leave:
2174 if (orphan_dir_inode)
2175 iput(orphan_dir_inode);
2176
2177 if (orphan_dir_bh)
2178 brelse(orphan_dir_bh);
2179
2180 mlog_exit(status);
2181 return status;
2182}
2183
2184/* unlike orphan_add, we expect the orphan dir to already be locked here. */
2185int ocfs2_orphan_del(struct ocfs2_super *osb,
2186 struct ocfs2_journal_handle *handle,
2187 struct inode *orphan_dir_inode,
2188 struct inode *inode,
2189 struct buffer_head *orphan_dir_bh)
2190{
2191 char name[OCFS2_ORPHAN_NAMELEN + 1];
2192 struct ocfs2_dinode *orphan_fe;
2193 int status = 0;
2194 struct buffer_head *target_de_bh = NULL;
2195 struct ocfs2_dir_entry *target_de = NULL;
2196
2197 mlog_entry_void();
2198
2199 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2200 if (status < 0) {
2201 mlog_errno(status);
2202 goto leave;
2203 }
2204
2205 mlog(0, "removing '%s' from orphan dir %"MLFu64" (namelen=%d)\n",
2206 name, OCFS2_I(orphan_dir_inode)->ip_blkno, OCFS2_ORPHAN_NAMELEN);
2207
2208 /* find it's spot in the orphan directory */
2209 target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
2210 orphan_dir_inode, &target_de);
2211 if (!target_de_bh) {
2212 status = -ENOENT;
2213 mlog_errno(status);
2214 goto leave;
2215 }
2216
2217 /* remove it from the orphan directory */
2218 status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
2219 target_de_bh);
2220 if (status < 0) {
2221 mlog_errno(status);
2222 goto leave;
2223 }
2224
2225 status = ocfs2_journal_access(handle,orphan_dir_inode, orphan_dir_bh,
2226 OCFS2_JOURNAL_ACCESS_WRITE);
2227 if (status < 0) {
2228 mlog_errno(status);
2229 goto leave;
2230 }
2231
2232 /* do the i_nlink dance! :) */
2233 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2234 if (S_ISDIR(inode->i_mode))
2235 le16_add_cpu(&orphan_fe->i_links_count, -1);
2236 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
2237
2238 status = ocfs2_journal_dirty(handle, orphan_dir_bh);
2239 if (status < 0) {
2240 mlog_errno(status);
2241 goto leave;
2242 }
2243
2244leave:
2245 if (target_de_bh)
2246 brelse(target_de_bh);
2247
2248 mlog_exit(status);
2249 return status;
2250}
2251
2252struct inode_operations ocfs2_dir_iops = {
2253 .create = ocfs2_create,
2254 .lookup = ocfs2_lookup,
2255 .link = ocfs2_link,
2256 .unlink = ocfs2_unlink,
2257 .rmdir = ocfs2_unlink,
2258 .symlink = ocfs2_symlink,
2259 .mkdir = ocfs2_mkdir,
2260 .mknod = ocfs2_mknod,
2261 .rename = ocfs2_rename,
2262 .setattr = ocfs2_setattr,
2263 .getattr = ocfs2_getattr,
2264};
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