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ccd979bd MF |
1 | /* -*- 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 | ||
62 | static unsigned char ocfs2_filetype_table[] = { | |
63 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
64 | }; | |
65 | ||
66 | static 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 | */ | |
74 | int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
75 | { | |
76 | int error = 0; | |
77 | unsigned long offset, blk; | |
78 | int i, num, stored; | |
79 | struct buffer_head * bh, * tmp; | |
80 | struct ocfs2_dir_entry * de; | |
81 | int err; | |
82 | struct inode *inode = filp->f_dentry->d_inode; | |
83 | struct super_block * sb = inode->i_sb; | |
84 | int have_disk_lock = 0; | |
85 | ||
b0697053 MF |
86 | mlog_entry("dirino=%llu\n", |
87 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
88 | |
89 | stored = 0; | |
90 | bh = NULL; | |
91 | ||
92 | error = ocfs2_meta_lock(inode, NULL, NULL, 0); | |
93 | if (error < 0) { | |
94 | if (error != -ENOENT) | |
95 | mlog_errno(error); | |
96 | /* we haven't got any yet, so propagate the error. */ | |
97 | stored = error; | |
98 | goto bail; | |
99 | } | |
100 | have_disk_lock = 1; | |
101 | ||
102 | offset = filp->f_pos & (sb->s_blocksize - 1); | |
103 | ||
104 | while (!error && !stored && filp->f_pos < i_size_read(inode)) { | |
105 | blk = (filp->f_pos) >> sb->s_blocksize_bits; | |
106 | bh = ocfs2_bread(inode, blk, &err, 0); | |
107 | if (!bh) { | |
b0697053 MF |
108 | mlog(ML_ERROR, |
109 | "directory #%llu contains a hole at offset %lld\n", | |
110 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
111 | filp->f_pos); |
112 | filp->f_pos += sb->s_blocksize - offset; | |
113 | continue; | |
114 | } | |
115 | ||
116 | /* | |
117 | * Do the readahead (8k) | |
118 | */ | |
119 | if (!offset) { | |
120 | for (i = 16 >> (sb->s_blocksize_bits - 9), num = 0; | |
121 | i > 0; i--) { | |
122 | tmp = ocfs2_bread(inode, ++blk, &err, 1); | |
123 | if (tmp) | |
124 | brelse(tmp); | |
125 | } | |
126 | } | |
127 | ||
128 | revalidate: | |
129 | /* If the dir block has changed since the last call to | |
130 | * readdir(2), then we might be pointing to an invalid | |
131 | * dirent right now. Scan from the start of the block | |
132 | * to make sure. */ | |
133 | if (filp->f_version != inode->i_version) { | |
134 | for (i = 0; i < sb->s_blocksize && i < offset; ) { | |
135 | de = (struct ocfs2_dir_entry *) (bh->b_data + i); | |
136 | /* It's too expensive to do a full | |
137 | * dirent test each time round this | |
138 | * loop, but we do have to test at | |
139 | * least that it is non-zero. A | |
140 | * failure will be detected in the | |
141 | * dirent test below. */ | |
142 | if (le16_to_cpu(de->rec_len) < | |
143 | OCFS2_DIR_REC_LEN(1)) | |
144 | break; | |
145 | i += le16_to_cpu(de->rec_len); | |
146 | } | |
147 | offset = i; | |
148 | filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1)) | |
149 | | offset; | |
150 | filp->f_version = inode->i_version; | |
151 | } | |
152 | ||
153 | while (!error && filp->f_pos < i_size_read(inode) | |
154 | && offset < sb->s_blocksize) { | |
155 | de = (struct ocfs2_dir_entry *) (bh->b_data + offset); | |
156 | if (!ocfs2_check_dir_entry(inode, de, bh, offset)) { | |
157 | /* On error, skip the f_pos to the | |
158 | next block. */ | |
159 | filp->f_pos = (filp->f_pos | | |
160 | (sb->s_blocksize - 1)) + 1; | |
161 | brelse(bh); | |
162 | goto bail; | |
163 | } | |
164 | offset += le16_to_cpu(de->rec_len); | |
165 | if (le64_to_cpu(de->inode)) { | |
166 | /* We might block in the next section | |
167 | * if the data destination is | |
168 | * currently swapped out. So, use a | |
169 | * version stamp to detect whether or | |
170 | * not the directory has been modified | |
171 | * during the copy operation. | |
172 | */ | |
173 | unsigned long version = filp->f_version; | |
174 | unsigned char d_type = DT_UNKNOWN; | |
175 | ||
176 | if (de->file_type < OCFS2_FT_MAX) | |
177 | d_type = ocfs2_filetype_table[de->file_type]; | |
178 | error = filldir(dirent, de->name, | |
179 | de->name_len, | |
180 | filp->f_pos, | |
181 | ino_from_blkno(sb, le64_to_cpu(de->inode)), | |
182 | d_type); | |
183 | if (error) | |
184 | break; | |
185 | if (version != filp->f_version) | |
186 | goto revalidate; | |
187 | stored ++; | |
188 | } | |
189 | filp->f_pos += le16_to_cpu(de->rec_len); | |
190 | } | |
191 | offset = 0; | |
192 | brelse(bh); | |
193 | } | |
194 | ||
195 | stored = 0; | |
196 | bail: | |
197 | if (have_disk_lock) | |
198 | ocfs2_meta_unlock(inode, 0); | |
199 | ||
200 | mlog_exit(stored); | |
201 | ||
202 | return stored; | |
203 | } | |
204 | ||
205 | /* | |
1b1dcc1b | 206 | * NOTE: this should always be called with parent dir i_mutex taken. |
ccd979bd MF |
207 | */ |
208 | int ocfs2_find_files_on_disk(const char *name, | |
209 | int namelen, | |
210 | u64 *blkno, | |
211 | struct inode *inode, | |
212 | struct buffer_head **dirent_bh, | |
213 | struct ocfs2_dir_entry **dirent) | |
214 | { | |
215 | int status = -ENOENT; | |
ccd979bd | 216 | |
2b388c67 JB |
217 | mlog_entry("(name=%.*s, blkno=%p, inode=%p, dirent_bh=%p, dirent=%p)\n", |
218 | namelen, name, blkno, inode, dirent_bh, dirent); | |
ccd979bd MF |
219 | |
220 | *dirent_bh = ocfs2_find_entry(name, namelen, inode, dirent); | |
221 | if (!*dirent_bh || !*dirent) { | |
222 | status = -ENOENT; | |
223 | goto leave; | |
224 | } | |
225 | ||
226 | *blkno = le64_to_cpu((*dirent)->inode); | |
227 | ||
228 | status = 0; | |
229 | leave: | |
230 | if (status < 0) { | |
231 | *dirent = NULL; | |
232 | if (*dirent_bh) { | |
233 | brelse(*dirent_bh); | |
234 | *dirent_bh = NULL; | |
235 | } | |
236 | } | |
237 | ||
238 | mlog_exit(status); | |
239 | return status; | |
240 | } | |
241 | ||
242 | /* Check for a name within a directory. | |
243 | * | |
244 | * Return 0 if the name does not exist | |
245 | * Return -EEXIST if the directory contains the name | |
246 | * | |
1b1dcc1b | 247 | * Callers should have i_mutex + a cluster lock on dir |
ccd979bd MF |
248 | */ |
249 | int ocfs2_check_dir_for_entry(struct inode *dir, | |
250 | const char *name, | |
251 | int namelen) | |
252 | { | |
253 | int ret; | |
254 | struct buffer_head *dirent_bh = NULL; | |
255 | struct ocfs2_dir_entry *dirent = NULL; | |
256 | ||
b0697053 MF |
257 | mlog_entry("dir %llu, name '%.*s'\n", |
258 | (unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name); | |
ccd979bd MF |
259 | |
260 | ret = -EEXIST; | |
261 | dirent_bh = ocfs2_find_entry(name, namelen, dir, &dirent); | |
262 | if (dirent_bh) | |
263 | goto bail; | |
264 | ||
265 | ret = 0; | |
266 | bail: | |
267 | if (dirent_bh) | |
268 | brelse(dirent_bh); | |
269 | ||
270 | mlog_exit(ret); | |
271 | return ret; | |
272 | } | |
273 | ||
274 | /* | |
275 | * routine to check that the specified directory is empty (for rmdir) | |
276 | */ | |
277 | int ocfs2_empty_dir(struct inode *inode) | |
278 | { | |
279 | unsigned long offset; | |
280 | struct buffer_head * bh; | |
281 | struct ocfs2_dir_entry * de, * de1; | |
282 | struct super_block * sb; | |
283 | int err; | |
284 | ||
285 | sb = inode->i_sb; | |
286 | if ((i_size_read(inode) < | |
287 | (OCFS2_DIR_REC_LEN(1) + OCFS2_DIR_REC_LEN(2))) || | |
288 | !(bh = ocfs2_bread(inode, 0, &err, 0))) { | |
b0697053 MF |
289 | mlog(ML_ERROR, "bad directory (dir #%llu) - no data block\n", |
290 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
291 | return 1; |
292 | } | |
293 | ||
294 | de = (struct ocfs2_dir_entry *) bh->b_data; | |
295 | de1 = (struct ocfs2_dir_entry *) | |
296 | ((char *)de + le16_to_cpu(de->rec_len)); | |
297 | if ((le64_to_cpu(de->inode) != OCFS2_I(inode)->ip_blkno) || | |
298 | !le64_to_cpu(de1->inode) || | |
299 | strcmp(".", de->name) || | |
300 | strcmp("..", de1->name)) { | |
b0697053 MF |
301 | mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n", |
302 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
303 | brelse(bh); |
304 | return 1; | |
305 | } | |
306 | offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len); | |
307 | de = (struct ocfs2_dir_entry *)((char *)de1 + le16_to_cpu(de1->rec_len)); | |
308 | while (offset < i_size_read(inode) ) { | |
309 | if (!bh || (void *)de >= (void *)(bh->b_data + sb->s_blocksize)) { | |
310 | brelse(bh); | |
311 | bh = ocfs2_bread(inode, | |
312 | offset >> sb->s_blocksize_bits, &err, 0); | |
313 | if (!bh) { | |
b0697053 MF |
314 | mlog(ML_ERROR, "dir %llu has a hole at %lu\n", |
315 | (unsigned long long)OCFS2_I(inode)->ip_blkno, offset); | |
ccd979bd MF |
316 | offset += sb->s_blocksize; |
317 | continue; | |
318 | } | |
319 | de = (struct ocfs2_dir_entry *) bh->b_data; | |
320 | } | |
321 | if (!ocfs2_check_dir_entry(inode, de, bh, offset)) { | |
322 | brelse(bh); | |
323 | return 1; | |
324 | } | |
325 | if (le64_to_cpu(de->inode)) { | |
326 | brelse(bh); | |
327 | return 0; | |
328 | } | |
329 | offset += le16_to_cpu(de->rec_len); | |
330 | de = (struct ocfs2_dir_entry *) | |
331 | ((char *)de + le16_to_cpu(de->rec_len)); | |
332 | } | |
333 | brelse(bh); | |
334 | return 1; | |
335 | } | |
336 | ||
337 | /* returns a bh of the 1st new block in the allocation. */ | |
338 | int ocfs2_do_extend_dir(struct super_block *sb, | |
339 | struct ocfs2_journal_handle *handle, | |
340 | struct inode *dir, | |
341 | struct buffer_head *parent_fe_bh, | |
342 | struct ocfs2_alloc_context *data_ac, | |
343 | struct ocfs2_alloc_context *meta_ac, | |
344 | struct buffer_head **new_bh) | |
345 | { | |
346 | int status; | |
347 | int extend; | |
348 | u64 p_blkno; | |
349 | ||
350 | spin_lock(&OCFS2_I(dir)->ip_lock); | |
351 | extend = (i_size_read(dir) == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)); | |
352 | spin_unlock(&OCFS2_I(dir)->ip_lock); | |
353 | ||
354 | if (extend) { | |
355 | status = ocfs2_do_extend_allocation(OCFS2_SB(sb), dir, 1, | |
356 | parent_fe_bh, handle, | |
357 | data_ac, meta_ac, NULL); | |
358 | BUG_ON(status == -EAGAIN); | |
359 | if (status < 0) { | |
360 | mlog_errno(status); | |
361 | goto bail; | |
362 | } | |
363 | } | |
364 | ||
365 | status = ocfs2_extent_map_get_blocks(dir, (dir->i_blocks >> | |
366 | (sb->s_blocksize_bits - 9)), | |
367 | 1, &p_blkno, NULL); | |
368 | if (status < 0) { | |
369 | mlog_errno(status); | |
370 | goto bail; | |
371 | } | |
372 | ||
373 | *new_bh = sb_getblk(sb, p_blkno); | |
374 | if (!*new_bh) { | |
375 | status = -EIO; | |
376 | mlog_errno(status); | |
377 | goto bail; | |
378 | } | |
379 | status = 0; | |
380 | bail: | |
381 | mlog_exit(status); | |
382 | return status; | |
383 | } | |
384 | ||
385 | /* assumes you already have a cluster lock on the directory. */ | |
386 | static int ocfs2_extend_dir(struct ocfs2_super *osb, | |
387 | struct inode *dir, | |
388 | struct buffer_head *parent_fe_bh, | |
389 | struct buffer_head **new_de_bh) | |
390 | { | |
391 | int status = 0; | |
392 | int credits, num_free_extents; | |
393 | loff_t dir_i_size; | |
394 | struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data; | |
395 | struct ocfs2_alloc_context *data_ac = NULL; | |
396 | struct ocfs2_alloc_context *meta_ac = NULL; | |
397 | struct ocfs2_journal_handle *handle = NULL; | |
398 | struct buffer_head *new_bh = NULL; | |
399 | struct ocfs2_dir_entry * de; | |
400 | struct super_block *sb = osb->sb; | |
401 | ||
402 | mlog_entry_void(); | |
403 | ||
404 | dir_i_size = i_size_read(dir); | |
b0697053 MF |
405 | mlog(0, "extending dir %llu (i_size = %lld)\n", |
406 | (unsigned long long)OCFS2_I(dir)->ip_blkno, dir_i_size); | |
ccd979bd MF |
407 | |
408 | handle = ocfs2_alloc_handle(osb); | |
409 | if (handle == NULL) { | |
410 | status = -ENOMEM; | |
411 | mlog_errno(status); | |
412 | goto bail; | |
413 | } | |
414 | ||
415 | /* dir->i_size is always block aligned. */ | |
416 | spin_lock(&OCFS2_I(dir)->ip_lock); | |
417 | if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) { | |
418 | spin_unlock(&OCFS2_I(dir)->ip_lock); | |
419 | num_free_extents = ocfs2_num_free_extents(osb, dir, fe); | |
420 | if (num_free_extents < 0) { | |
421 | status = num_free_extents; | |
422 | mlog_errno(status); | |
423 | goto bail; | |
424 | } | |
425 | ||
426 | if (!num_free_extents) { | |
427 | status = ocfs2_reserve_new_metadata(osb, handle, | |
428 | fe, &meta_ac); | |
429 | if (status < 0) { | |
430 | if (status != -ENOSPC) | |
431 | mlog_errno(status); | |
432 | goto bail; | |
433 | } | |
434 | } | |
435 | ||
436 | status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac); | |
437 | if (status < 0) { | |
438 | if (status != -ENOSPC) | |
439 | mlog_errno(status); | |
440 | goto bail; | |
441 | } | |
442 | ||
443 | credits = ocfs2_calc_extend_credits(sb, fe, 1); | |
444 | } else { | |
445 | spin_unlock(&OCFS2_I(dir)->ip_lock); | |
446 | credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS; | |
447 | } | |
448 | ||
449 | handle = ocfs2_start_trans(osb, handle, credits); | |
450 | if (IS_ERR(handle)) { | |
451 | status = PTR_ERR(handle); | |
452 | handle = NULL; | |
453 | mlog_errno(status); | |
454 | goto bail; | |
455 | } | |
456 | ||
457 | status = ocfs2_do_extend_dir(osb->sb, handle, dir, parent_fe_bh, | |
458 | data_ac, meta_ac, &new_bh); | |
459 | if (status < 0) { | |
460 | mlog_errno(status); | |
461 | goto bail; | |
462 | } | |
463 | ||
464 | ocfs2_set_new_buffer_uptodate(dir, new_bh); | |
465 | ||
466 | status = ocfs2_journal_access(handle, dir, new_bh, | |
467 | OCFS2_JOURNAL_ACCESS_CREATE); | |
468 | if (status < 0) { | |
469 | mlog_errno(status); | |
470 | goto bail; | |
471 | } | |
472 | memset(new_bh->b_data, 0, sb->s_blocksize); | |
473 | de = (struct ocfs2_dir_entry *) new_bh->b_data; | |
474 | de->inode = 0; | |
475 | de->rec_len = cpu_to_le16(sb->s_blocksize); | |
476 | status = ocfs2_journal_dirty(handle, new_bh); | |
477 | if (status < 0) { | |
478 | mlog_errno(status); | |
479 | goto bail; | |
480 | } | |
481 | ||
482 | dir_i_size += dir->i_sb->s_blocksize; | |
483 | i_size_write(dir, dir_i_size); | |
484 | dir->i_blocks = ocfs2_align_bytes_to_sectors(dir_i_size); | |
485 | status = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh); | |
486 | if (status < 0) { | |
487 | mlog_errno(status); | |
488 | goto bail; | |
489 | } | |
490 | ||
491 | *new_de_bh = new_bh; | |
492 | get_bh(*new_de_bh); | |
493 | bail: | |
494 | if (handle) | |
495 | ocfs2_commit_trans(handle); | |
496 | ||
497 | if (data_ac) | |
498 | ocfs2_free_alloc_context(data_ac); | |
499 | if (meta_ac) | |
500 | ocfs2_free_alloc_context(meta_ac); | |
501 | ||
502 | if (new_bh) | |
503 | brelse(new_bh); | |
504 | ||
505 | mlog_exit(status); | |
506 | return status; | |
507 | } | |
508 | ||
509 | /* | |
510 | * Search the dir for a good spot, extending it if necessary. The | |
511 | * block containing an appropriate record is returned in ret_de_bh. | |
512 | */ | |
513 | int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb, | |
514 | struct inode *dir, | |
515 | struct buffer_head *parent_fe_bh, | |
516 | const char *name, | |
517 | int namelen, | |
518 | struct buffer_head **ret_de_bh) | |
519 | { | |
520 | unsigned long offset; | |
521 | struct buffer_head * bh = NULL; | |
522 | unsigned short rec_len; | |
523 | struct ocfs2_dinode *fe; | |
524 | struct ocfs2_dir_entry *de; | |
525 | struct super_block *sb; | |
526 | int status; | |
527 | ||
528 | mlog_entry_void(); | |
529 | ||
b0697053 MF |
530 | mlog(0, "getting ready to insert namelen %d into dir %llu\n", |
531 | namelen, (unsigned long long)OCFS2_I(dir)->ip_blkno); | |
ccd979bd MF |
532 | |
533 | BUG_ON(!S_ISDIR(dir->i_mode)); | |
534 | fe = (struct ocfs2_dinode *) parent_fe_bh->b_data; | |
535 | BUG_ON(le64_to_cpu(fe->i_size) != i_size_read(dir)); | |
536 | ||
537 | sb = dir->i_sb; | |
538 | ||
539 | if (!namelen) { | |
540 | status = -EINVAL; | |
541 | mlog_errno(status); | |
542 | goto bail; | |
543 | } | |
544 | ||
545 | bh = ocfs2_bread(dir, 0, &status, 0); | |
546 | if (!bh) { | |
547 | mlog_errno(status); | |
548 | goto bail; | |
549 | } | |
550 | ||
551 | rec_len = OCFS2_DIR_REC_LEN(namelen); | |
552 | offset = 0; | |
553 | de = (struct ocfs2_dir_entry *) bh->b_data; | |
554 | while (1) { | |
555 | if ((char *)de >= sb->s_blocksize + bh->b_data) { | |
556 | brelse(bh); | |
557 | bh = NULL; | |
558 | ||
559 | if (i_size_read(dir) <= offset) { | |
560 | status = ocfs2_extend_dir(osb, | |
561 | dir, | |
562 | parent_fe_bh, | |
563 | &bh); | |
564 | if (status < 0) { | |
565 | mlog_errno(status); | |
566 | goto bail; | |
567 | } | |
568 | BUG_ON(!bh); | |
569 | *ret_de_bh = bh; | |
570 | get_bh(*ret_de_bh); | |
571 | goto bail; | |
572 | } | |
573 | bh = ocfs2_bread(dir, | |
574 | offset >> sb->s_blocksize_bits, | |
575 | &status, | |
576 | 0); | |
577 | if (!bh) { | |
578 | mlog_errno(status); | |
579 | goto bail; | |
580 | } | |
581 | /* move to next block */ | |
582 | de = (struct ocfs2_dir_entry *) bh->b_data; | |
583 | } | |
584 | if (!ocfs2_check_dir_entry(dir, de, bh, offset)) { | |
585 | status = -ENOENT; | |
586 | goto bail; | |
587 | } | |
588 | if (ocfs2_match(namelen, name, de)) { | |
589 | status = -EEXIST; | |
590 | goto bail; | |
591 | } | |
592 | if (((le64_to_cpu(de->inode) == 0) && | |
593 | (le16_to_cpu(de->rec_len) >= rec_len)) || | |
594 | (le16_to_cpu(de->rec_len) >= | |
595 | (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) { | |
596 | /* Ok, we found a spot. Return this bh and let | |
597 | * the caller actually fill it in. */ | |
598 | *ret_de_bh = bh; | |
599 | get_bh(*ret_de_bh); | |
600 | status = 0; | |
601 | goto bail; | |
602 | } | |
603 | offset += le16_to_cpu(de->rec_len); | |
604 | de = (struct ocfs2_dir_entry *)((char *) de + le16_to_cpu(de->rec_len)); | |
605 | } | |
606 | ||
607 | status = 0; | |
608 | bail: | |
609 | if (bh) | |
610 | brelse(bh); | |
611 | ||
612 | mlog_exit(status); | |
613 | return status; | |
614 | } |