blob: 0d5fdde959c8018a2d244ae678d16fde1e5b3f33 [file] [log] [blame]
Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dir.c
5 *
6 * Creates, reads, walks and deletes directory-nodes
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 "dir.h"
51#include "dlmglue.h"
52#include "extent_map.h"
53#include "file.h"
54#include "inode.h"
55#include "journal.h"
56#include "namei.h"
57#include "suballoc.h"
58#include "uptodate.h"
59
60#include "buffer_head_io.h"
61
62static unsigned char ocfs2_filetype_table[] = {
63 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
64};
65
66static int ocfs2_extend_dir(struct ocfs2_super *osb,
67 struct inode *dir,
68 struct buffer_head *parent_fe_bh,
69 struct buffer_head **new_de_bh);
70/*
71 * ocfs2_readdir()
72 *
73 */
74int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir)
75{
76 int error = 0;
Mark Fashehaa958872006-04-21 13:49:02 -070077 unsigned long offset, blk, last_ra_blk = 0;
78 int i, stored;
Mark Fashehccd979b2005-12-15 14:31:24 -080079 struct buffer_head * bh, * tmp;
80 struct ocfs2_dir_entry * de;
81 int err;
Josef Sipekd28c9172006-12-08 02:37:25 -080082 struct inode *inode = filp->f_path.dentry->d_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -080083 struct super_block * sb = inode->i_sb;
Mark Fashehaa958872006-04-21 13:49:02 -070084 unsigned int ra_sectors = 16;
Tiger Yang25899de2006-11-15 15:49:02 +080085 int lock_level = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -080086
Mark Fashehb06970532006-03-03 10:24:33 -080087 mlog_entry("dirino=%llu\n",
88 (unsigned long long)OCFS2_I(inode)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -080089
90 stored = 0;
91 bh = NULL;
92
Tiger Yang25899de2006-11-15 15:49:02 +080093 error = ocfs2_meta_lock_atime(inode, filp->f_vfsmnt, &lock_level);
94 if (lock_level && error >= 0) {
95 /* We release EX lock which used to update atime
96 * and get PR lock again to reduce contention
97 * on commonly accessed directories. */
98 ocfs2_meta_unlock(inode, 1);
99 lock_level = 0;
100 error = ocfs2_meta_lock(inode, NULL, 0);
101 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800102 if (error < 0) {
103 if (error != -ENOENT)
104 mlog_errno(error);
105 /* we haven't got any yet, so propagate the error. */
106 stored = error;
Mark Fashehaa958872006-04-21 13:49:02 -0700107 goto bail_nolock;
Mark Fashehccd979b2005-12-15 14:31:24 -0800108 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800109
110 offset = filp->f_pos & (sb->s_blocksize - 1);
111
112 while (!error && !stored && filp->f_pos < i_size_read(inode)) {
113 blk = (filp->f_pos) >> sb->s_blocksize_bits;
114 bh = ocfs2_bread(inode, blk, &err, 0);
115 if (!bh) {
Mark Fashehb06970532006-03-03 10:24:33 -0800116 mlog(ML_ERROR,
117 "directory #%llu contains a hole at offset %lld\n",
118 (unsigned long long)OCFS2_I(inode)->ip_blkno,
Mark Fashehccd979b2005-12-15 14:31:24 -0800119 filp->f_pos);
120 filp->f_pos += sb->s_blocksize - offset;
121 continue;
122 }
123
Mark Fashehaa958872006-04-21 13:49:02 -0700124 /* The idea here is to begin with 8k read-ahead and to stay
125 * 4k ahead of our current position.
126 *
127 * TODO: Use the pagecache for this. We just need to
128 * make sure it's cluster-safe... */
129 if (!last_ra_blk
130 || (((last_ra_blk - blk) << 9) <= (ra_sectors / 2))) {
131 for (i = ra_sectors >> (sb->s_blocksize_bits - 9);
Mark Fashehccd979b2005-12-15 14:31:24 -0800132 i > 0; i--) {
133 tmp = ocfs2_bread(inode, ++blk, &err, 1);
134 if (tmp)
135 brelse(tmp);
136 }
Mark Fashehaa958872006-04-21 13:49:02 -0700137 last_ra_blk = blk;
138 ra_sectors = 8;
Mark Fashehccd979b2005-12-15 14:31:24 -0800139 }
140
141revalidate:
142 /* If the dir block has changed since the last call to
143 * readdir(2), then we might be pointing to an invalid
144 * dirent right now. Scan from the start of the block
145 * to make sure. */
146 if (filp->f_version != inode->i_version) {
147 for (i = 0; i < sb->s_blocksize && i < offset; ) {
148 de = (struct ocfs2_dir_entry *) (bh->b_data + i);
149 /* It's too expensive to do a full
150 * dirent test each time round this
151 * loop, but we do have to test at
152 * least that it is non-zero. A
153 * failure will be detected in the
154 * dirent test below. */
155 if (le16_to_cpu(de->rec_len) <
156 OCFS2_DIR_REC_LEN(1))
157 break;
158 i += le16_to_cpu(de->rec_len);
159 }
160 offset = i;
161 filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1))
162 | offset;
163 filp->f_version = inode->i_version;
164 }
165
166 while (!error && filp->f_pos < i_size_read(inode)
167 && offset < sb->s_blocksize) {
168 de = (struct ocfs2_dir_entry *) (bh->b_data + offset);
169 if (!ocfs2_check_dir_entry(inode, de, bh, offset)) {
170 /* On error, skip the f_pos to the
171 next block. */
172 filp->f_pos = (filp->f_pos |
173 (sb->s_blocksize - 1)) + 1;
174 brelse(bh);
175 goto bail;
176 }
177 offset += le16_to_cpu(de->rec_len);
178 if (le64_to_cpu(de->inode)) {
179 /* We might block in the next section
180 * if the data destination is
181 * currently swapped out. So, use a
182 * version stamp to detect whether or
183 * not the directory has been modified
184 * during the copy operation.
185 */
186 unsigned long version = filp->f_version;
187 unsigned char d_type = DT_UNKNOWN;
188
189 if (de->file_type < OCFS2_FT_MAX)
190 d_type = ocfs2_filetype_table[de->file_type];
191 error = filldir(dirent, de->name,
192 de->name_len,
193 filp->f_pos,
194 ino_from_blkno(sb, le64_to_cpu(de->inode)),
195 d_type);
196 if (error)
197 break;
198 if (version != filp->f_version)
199 goto revalidate;
200 stored ++;
201 }
202 filp->f_pos += le16_to_cpu(de->rec_len);
203 }
204 offset = 0;
205 brelse(bh);
206 }
207
208 stored = 0;
209bail:
Tiger Yang25899de2006-11-15 15:49:02 +0800210 ocfs2_meta_unlock(inode, lock_level);
Mark Fashehccd979b2005-12-15 14:31:24 -0800211
Mark Fashehaa958872006-04-21 13:49:02 -0700212bail_nolock:
Mark Fashehccd979b2005-12-15 14:31:24 -0800213 mlog_exit(stored);
214
215 return stored;
216}
217
218/*
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800219 * NOTE: this should always be called with parent dir i_mutex taken.
Mark Fashehccd979b2005-12-15 14:31:24 -0800220 */
221int ocfs2_find_files_on_disk(const char *name,
222 int namelen,
223 u64 *blkno,
224 struct inode *inode,
225 struct buffer_head **dirent_bh,
226 struct ocfs2_dir_entry **dirent)
227{
228 int status = -ENOENT;
Mark Fashehccd979b2005-12-15 14:31:24 -0800229
Joel Becker2b388c62006-05-10 18:28:59 -0700230 mlog_entry("(name=%.*s, blkno=%p, inode=%p, dirent_bh=%p, dirent=%p)\n",
231 namelen, name, blkno, inode, dirent_bh, dirent);
Mark Fashehccd979b2005-12-15 14:31:24 -0800232
233 *dirent_bh = ocfs2_find_entry(name, namelen, inode, dirent);
234 if (!*dirent_bh || !*dirent) {
235 status = -ENOENT;
236 goto leave;
237 }
238
239 *blkno = le64_to_cpu((*dirent)->inode);
240
241 status = 0;
242leave:
243 if (status < 0) {
244 *dirent = NULL;
245 if (*dirent_bh) {
246 brelse(*dirent_bh);
247 *dirent_bh = NULL;
248 }
249 }
250
251 mlog_exit(status);
252 return status;
253}
254
255/* Check for a name within a directory.
256 *
257 * Return 0 if the name does not exist
258 * Return -EEXIST if the directory contains the name
259 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800260 * Callers should have i_mutex + a cluster lock on dir
Mark Fashehccd979b2005-12-15 14:31:24 -0800261 */
262int ocfs2_check_dir_for_entry(struct inode *dir,
263 const char *name,
264 int namelen)
265{
266 int ret;
267 struct buffer_head *dirent_bh = NULL;
268 struct ocfs2_dir_entry *dirent = NULL;
269
Mark Fashehb06970532006-03-03 10:24:33 -0800270 mlog_entry("dir %llu, name '%.*s'\n",
271 (unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name);
Mark Fashehccd979b2005-12-15 14:31:24 -0800272
273 ret = -EEXIST;
274 dirent_bh = ocfs2_find_entry(name, namelen, dir, &dirent);
275 if (dirent_bh)
276 goto bail;
277
278 ret = 0;
279bail:
280 if (dirent_bh)
281 brelse(dirent_bh);
282
283 mlog_exit(ret);
284 return ret;
285}
286
287/*
288 * routine to check that the specified directory is empty (for rmdir)
289 */
290int ocfs2_empty_dir(struct inode *inode)
291{
292 unsigned long offset;
293 struct buffer_head * bh;
294 struct ocfs2_dir_entry * de, * de1;
295 struct super_block * sb;
296 int err;
297
298 sb = inode->i_sb;
299 if ((i_size_read(inode) <
300 (OCFS2_DIR_REC_LEN(1) + OCFS2_DIR_REC_LEN(2))) ||
301 !(bh = ocfs2_bread(inode, 0, &err, 0))) {
Mark Fashehb06970532006-03-03 10:24:33 -0800302 mlog(ML_ERROR, "bad directory (dir #%llu) - no data block\n",
303 (unsigned long long)OCFS2_I(inode)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800304 return 1;
305 }
306
307 de = (struct ocfs2_dir_entry *) bh->b_data;
308 de1 = (struct ocfs2_dir_entry *)
309 ((char *)de + le16_to_cpu(de->rec_len));
310 if ((le64_to_cpu(de->inode) != OCFS2_I(inode)->ip_blkno) ||
311 !le64_to_cpu(de1->inode) ||
312 strcmp(".", de->name) ||
313 strcmp("..", de1->name)) {
Mark Fashehb06970532006-03-03 10:24:33 -0800314 mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n",
315 (unsigned long long)OCFS2_I(inode)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800316 brelse(bh);
317 return 1;
318 }
319 offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
320 de = (struct ocfs2_dir_entry *)((char *)de1 + le16_to_cpu(de1->rec_len));
321 while (offset < i_size_read(inode) ) {
322 if (!bh || (void *)de >= (void *)(bh->b_data + sb->s_blocksize)) {
323 brelse(bh);
324 bh = ocfs2_bread(inode,
325 offset >> sb->s_blocksize_bits, &err, 0);
326 if (!bh) {
Mark Fashehb06970532006-03-03 10:24:33 -0800327 mlog(ML_ERROR, "dir %llu has a hole at %lu\n",
328 (unsigned long long)OCFS2_I(inode)->ip_blkno, offset);
Mark Fashehccd979b2005-12-15 14:31:24 -0800329 offset += sb->s_blocksize;
330 continue;
331 }
332 de = (struct ocfs2_dir_entry *) bh->b_data;
333 }
334 if (!ocfs2_check_dir_entry(inode, de, bh, offset)) {
335 brelse(bh);
336 return 1;
337 }
338 if (le64_to_cpu(de->inode)) {
339 brelse(bh);
340 return 0;
341 }
342 offset += le16_to_cpu(de->rec_len);
343 de = (struct ocfs2_dir_entry *)
344 ((char *)de + le16_to_cpu(de->rec_len));
345 }
346 brelse(bh);
347 return 1;
348}
349
350/* returns a bh of the 1st new block in the allocation. */
351int ocfs2_do_extend_dir(struct super_block *sb,
Mark Fasheh1fabe142006-10-09 18:11:45 -0700352 handle_t *handle,
Mark Fashehccd979b2005-12-15 14:31:24 -0800353 struct inode *dir,
354 struct buffer_head *parent_fe_bh,
355 struct ocfs2_alloc_context *data_ac,
356 struct ocfs2_alloc_context *meta_ac,
357 struct buffer_head **new_bh)
358{
359 int status;
360 int extend;
Mark Fasheh8110b072007-03-22 16:53:23 -0700361 u64 p_blkno, v_blkno;
Mark Fashehccd979b2005-12-15 14:31:24 -0800362
363 spin_lock(&OCFS2_I(dir)->ip_lock);
364 extend = (i_size_read(dir) == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters));
365 spin_unlock(&OCFS2_I(dir)->ip_lock);
366
367 if (extend) {
Mark Fashehdcd05382007-01-16 11:32:23 -0800368 u32 offset = OCFS2_I(dir)->ip_clusters;
369
370 status = ocfs2_do_extend_allocation(OCFS2_SB(sb), dir, &offset,
Mark Fasheh2ae99a62007-03-09 16:43:28 -0800371 1, 0, parent_fe_bh, handle,
Mark Fashehccd979b2005-12-15 14:31:24 -0800372 data_ac, meta_ac, NULL);
373 BUG_ON(status == -EAGAIN);
374 if (status < 0) {
375 mlog_errno(status);
376 goto bail;
377 }
378 }
379
Mark Fasheh8110b072007-03-22 16:53:23 -0700380 v_blkno = ocfs2_blocks_for_bytes(sb, i_size_read(dir));
381 status = ocfs2_extent_map_get_blocks(dir, v_blkno, &p_blkno, NULL, NULL);
Mark Fashehccd979b2005-12-15 14:31:24 -0800382 if (status < 0) {
383 mlog_errno(status);
384 goto bail;
385 }
386
387 *new_bh = sb_getblk(sb, p_blkno);
388 if (!*new_bh) {
389 status = -EIO;
390 mlog_errno(status);
391 goto bail;
392 }
393 status = 0;
394bail:
395 mlog_exit(status);
396 return status;
397}
398
399/* assumes you already have a cluster lock on the directory. */
400static int ocfs2_extend_dir(struct ocfs2_super *osb,
401 struct inode *dir,
402 struct buffer_head *parent_fe_bh,
403 struct buffer_head **new_de_bh)
404{
405 int status = 0;
Joel Beckeree19a772007-03-28 18:27:07 -0700406 int credits, num_free_extents, drop_alloc_sem = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -0800407 loff_t dir_i_size;
408 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
409 struct ocfs2_alloc_context *data_ac = NULL;
410 struct ocfs2_alloc_context *meta_ac = NULL;
Mark Fasheh1fabe142006-10-09 18:11:45 -0700411 handle_t *handle = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800412 struct buffer_head *new_bh = NULL;
413 struct ocfs2_dir_entry * de;
414 struct super_block *sb = osb->sb;
415
416 mlog_entry_void();
417
418 dir_i_size = i_size_read(dir);
Mark Fashehb06970532006-03-03 10:24:33 -0800419 mlog(0, "extending dir %llu (i_size = %lld)\n",
420 (unsigned long long)OCFS2_I(dir)->ip_blkno, dir_i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -0800421
Mark Fashehccd979b2005-12-15 14:31:24 -0800422 /* dir->i_size is always block aligned. */
423 spin_lock(&OCFS2_I(dir)->ip_lock);
424 if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) {
425 spin_unlock(&OCFS2_I(dir)->ip_lock);
426 num_free_extents = ocfs2_num_free_extents(osb, dir, fe);
427 if (num_free_extents < 0) {
428 status = num_free_extents;
429 mlog_errno(status);
430 goto bail;
431 }
432
433 if (!num_free_extents) {
Mark Fashehda5cbf22006-10-06 18:34:35 -0700434 status = ocfs2_reserve_new_metadata(osb, fe, &meta_ac);
Mark Fashehccd979b2005-12-15 14:31:24 -0800435 if (status < 0) {
436 if (status != -ENOSPC)
437 mlog_errno(status);
438 goto bail;
439 }
440 }
441
Mark Fashehda5cbf22006-10-06 18:34:35 -0700442 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
Mark Fashehccd979b2005-12-15 14:31:24 -0800443 if (status < 0) {
444 if (status != -ENOSPC)
445 mlog_errno(status);
446 goto bail;
447 }
448
449 credits = ocfs2_calc_extend_credits(sb, fe, 1);
450 } else {
451 spin_unlock(&OCFS2_I(dir)->ip_lock);
452 credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
453 }
454
Joel Beckeree19a772007-03-28 18:27:07 -0700455 down_write(&OCFS2_I(dir)->ip_alloc_sem);
456 drop_alloc_sem = 1;
457
Mark Fasheh65eff9c2006-10-09 17:26:22 -0700458 handle = ocfs2_start_trans(osb, credits);
Mark Fashehccd979b2005-12-15 14:31:24 -0800459 if (IS_ERR(handle)) {
460 status = PTR_ERR(handle);
461 handle = NULL;
462 mlog_errno(status);
463 goto bail;
464 }
465
466 status = ocfs2_do_extend_dir(osb->sb, handle, dir, parent_fe_bh,
467 data_ac, meta_ac, &new_bh);
468 if (status < 0) {
469 mlog_errno(status);
470 goto bail;
471 }
472
473 ocfs2_set_new_buffer_uptodate(dir, new_bh);
474
475 status = ocfs2_journal_access(handle, dir, new_bh,
476 OCFS2_JOURNAL_ACCESS_CREATE);
477 if (status < 0) {
478 mlog_errno(status);
479 goto bail;
480 }
481 memset(new_bh->b_data, 0, sb->s_blocksize);
482 de = (struct ocfs2_dir_entry *) new_bh->b_data;
483 de->inode = 0;
484 de->rec_len = cpu_to_le16(sb->s_blocksize);
485 status = ocfs2_journal_dirty(handle, new_bh);
486 if (status < 0) {
487 mlog_errno(status);
488 goto bail;
489 }
490
491 dir_i_size += dir->i_sb->s_blocksize;
492 i_size_write(dir, dir_i_size);
Mark Fasheh8110b072007-03-22 16:53:23 -0700493 dir->i_blocks = ocfs2_inode_sector_count(dir);
Mark Fashehccd979b2005-12-15 14:31:24 -0800494 status = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
495 if (status < 0) {
496 mlog_errno(status);
497 goto bail;
498 }
499
500 *new_de_bh = new_bh;
501 get_bh(*new_de_bh);
502bail:
Joel Beckeree19a772007-03-28 18:27:07 -0700503 if (drop_alloc_sem)
504 up_write(&OCFS2_I(dir)->ip_alloc_sem);
Mark Fashehccd979b2005-12-15 14:31:24 -0800505 if (handle)
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700506 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -0800507
508 if (data_ac)
509 ocfs2_free_alloc_context(data_ac);
510 if (meta_ac)
511 ocfs2_free_alloc_context(meta_ac);
512
513 if (new_bh)
514 brelse(new_bh);
515
516 mlog_exit(status);
517 return status;
518}
519
520/*
521 * Search the dir for a good spot, extending it if necessary. The
522 * block containing an appropriate record is returned in ret_de_bh.
523 */
524int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
525 struct inode *dir,
526 struct buffer_head *parent_fe_bh,
527 const char *name,
528 int namelen,
529 struct buffer_head **ret_de_bh)
530{
531 unsigned long offset;
532 struct buffer_head * bh = NULL;
533 unsigned short rec_len;
534 struct ocfs2_dinode *fe;
535 struct ocfs2_dir_entry *de;
536 struct super_block *sb;
537 int status;
538
539 mlog_entry_void();
540
Mark Fashehb06970532006-03-03 10:24:33 -0800541 mlog(0, "getting ready to insert namelen %d into dir %llu\n",
542 namelen, (unsigned long long)OCFS2_I(dir)->ip_blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800543
544 BUG_ON(!S_ISDIR(dir->i_mode));
545 fe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
546 BUG_ON(le64_to_cpu(fe->i_size) != i_size_read(dir));
547
548 sb = dir->i_sb;
549
550 if (!namelen) {
551 status = -EINVAL;
552 mlog_errno(status);
553 goto bail;
554 }
555
556 bh = ocfs2_bread(dir, 0, &status, 0);
557 if (!bh) {
558 mlog_errno(status);
559 goto bail;
560 }
561
562 rec_len = OCFS2_DIR_REC_LEN(namelen);
563 offset = 0;
564 de = (struct ocfs2_dir_entry *) bh->b_data;
565 while (1) {
566 if ((char *)de >= sb->s_blocksize + bh->b_data) {
567 brelse(bh);
568 bh = NULL;
569
570 if (i_size_read(dir) <= offset) {
571 status = ocfs2_extend_dir(osb,
572 dir,
573 parent_fe_bh,
574 &bh);
575 if (status < 0) {
576 mlog_errno(status);
577 goto bail;
578 }
579 BUG_ON(!bh);
580 *ret_de_bh = bh;
581 get_bh(*ret_de_bh);
582 goto bail;
583 }
584 bh = ocfs2_bread(dir,
585 offset >> sb->s_blocksize_bits,
586 &status,
587 0);
588 if (!bh) {
589 mlog_errno(status);
590 goto bail;
591 }
592 /* move to next block */
593 de = (struct ocfs2_dir_entry *) bh->b_data;
594 }
595 if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
596 status = -ENOENT;
597 goto bail;
598 }
599 if (ocfs2_match(namelen, name, de)) {
600 status = -EEXIST;
601 goto bail;
602 }
603 if (((le64_to_cpu(de->inode) == 0) &&
604 (le16_to_cpu(de->rec_len) >= rec_len)) ||
605 (le16_to_cpu(de->rec_len) >=
606 (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
607 /* Ok, we found a spot. Return this bh and let
608 * the caller actually fill it in. */
609 *ret_de_bh = bh;
610 get_bh(*ret_de_bh);
611 status = 0;
612 goto bail;
613 }
614 offset += le16_to_cpu(de->rec_len);
615 de = (struct ocfs2_dir_entry *)((char *) de + le16_to_cpu(de->rec_len));
616 }
617
618 status = 0;
619bail:
620 if (bh)
621 brelse(bh);
622
623 mlog_exit(status);
624 return status;
625}