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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; | |
aa958874 MF |
77 | unsigned long offset, blk, last_ra_blk = 0; |
78 | int i, stored; | |
ccd979bd MF |
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; | |
aa958874 | 84 | unsigned int ra_sectors = 16; |
ccd979bd | 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 | ||
4bcec184 | 92 | error = ocfs2_meta_lock(inode, NULL, 0); |
ccd979bd MF |
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; | |
aa958874 | 98 | goto bail_nolock; |
ccd979bd | 99 | } |
ccd979bd MF |
100 | |
101 | offset = filp->f_pos & (sb->s_blocksize - 1); | |
102 | ||
103 | while (!error && !stored && filp->f_pos < i_size_read(inode)) { | |
104 | blk = (filp->f_pos) >> sb->s_blocksize_bits; | |
105 | bh = ocfs2_bread(inode, blk, &err, 0); | |
106 | if (!bh) { | |
b0697053 MF |
107 | mlog(ML_ERROR, |
108 | "directory #%llu contains a hole at offset %lld\n", | |
109 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
110 | filp->f_pos); |
111 | filp->f_pos += sb->s_blocksize - offset; | |
112 | continue; | |
113 | } | |
114 | ||
aa958874 MF |
115 | /* The idea here is to begin with 8k read-ahead and to stay |
116 | * 4k ahead of our current position. | |
117 | * | |
118 | * TODO: Use the pagecache for this. We just need to | |
119 | * make sure it's cluster-safe... */ | |
120 | if (!last_ra_blk | |
121 | || (((last_ra_blk - blk) << 9) <= (ra_sectors / 2))) { | |
122 | for (i = ra_sectors >> (sb->s_blocksize_bits - 9); | |
ccd979bd MF |
123 | i > 0; i--) { |
124 | tmp = ocfs2_bread(inode, ++blk, &err, 1); | |
125 | if (tmp) | |
126 | brelse(tmp); | |
127 | } | |
aa958874 MF |
128 | last_ra_blk = blk; |
129 | ra_sectors = 8; | |
ccd979bd MF |
130 | } |
131 | ||
132 | revalidate: | |
133 | /* If the dir block has changed since the last call to | |
134 | * readdir(2), then we might be pointing to an invalid | |
135 | * dirent right now. Scan from the start of the block | |
136 | * to make sure. */ | |
137 | if (filp->f_version != inode->i_version) { | |
138 | for (i = 0; i < sb->s_blocksize && i < offset; ) { | |
139 | de = (struct ocfs2_dir_entry *) (bh->b_data + i); | |
140 | /* It's too expensive to do a full | |
141 | * dirent test each time round this | |
142 | * loop, but we do have to test at | |
143 | * least that it is non-zero. A | |
144 | * failure will be detected in the | |
145 | * dirent test below. */ | |
146 | if (le16_to_cpu(de->rec_len) < | |
147 | OCFS2_DIR_REC_LEN(1)) | |
148 | break; | |
149 | i += le16_to_cpu(de->rec_len); | |
150 | } | |
151 | offset = i; | |
152 | filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1)) | |
153 | | offset; | |
154 | filp->f_version = inode->i_version; | |
155 | } | |
156 | ||
157 | while (!error && filp->f_pos < i_size_read(inode) | |
158 | && offset < sb->s_blocksize) { | |
159 | de = (struct ocfs2_dir_entry *) (bh->b_data + offset); | |
160 | if (!ocfs2_check_dir_entry(inode, de, bh, offset)) { | |
161 | /* On error, skip the f_pos to the | |
162 | next block. */ | |
163 | filp->f_pos = (filp->f_pos | | |
164 | (sb->s_blocksize - 1)) + 1; | |
165 | brelse(bh); | |
166 | goto bail; | |
167 | } | |
168 | offset += le16_to_cpu(de->rec_len); | |
169 | if (le64_to_cpu(de->inode)) { | |
170 | /* We might block in the next section | |
171 | * if the data destination is | |
172 | * currently swapped out. So, use a | |
173 | * version stamp to detect whether or | |
174 | * not the directory has been modified | |
175 | * during the copy operation. | |
176 | */ | |
177 | unsigned long version = filp->f_version; | |
178 | unsigned char d_type = DT_UNKNOWN; | |
179 | ||
180 | if (de->file_type < OCFS2_FT_MAX) | |
181 | d_type = ocfs2_filetype_table[de->file_type]; | |
182 | error = filldir(dirent, de->name, | |
183 | de->name_len, | |
184 | filp->f_pos, | |
185 | ino_from_blkno(sb, le64_to_cpu(de->inode)), | |
186 | d_type); | |
187 | if (error) | |
188 | break; | |
189 | if (version != filp->f_version) | |
190 | goto revalidate; | |
191 | stored ++; | |
192 | } | |
193 | filp->f_pos += le16_to_cpu(de->rec_len); | |
194 | } | |
195 | offset = 0; | |
196 | brelse(bh); | |
197 | } | |
198 | ||
199 | stored = 0; | |
200 | bail: | |
aa958874 | 201 | ocfs2_meta_unlock(inode, 0); |
ccd979bd | 202 | |
aa958874 | 203 | bail_nolock: |
ccd979bd MF |
204 | mlog_exit(stored); |
205 | ||
206 | return stored; | |
207 | } | |
208 | ||
209 | /* | |
1b1dcc1b | 210 | * NOTE: this should always be called with parent dir i_mutex taken. |
ccd979bd MF |
211 | */ |
212 | int ocfs2_find_files_on_disk(const char *name, | |
213 | int namelen, | |
214 | u64 *blkno, | |
215 | struct inode *inode, | |
216 | struct buffer_head **dirent_bh, | |
217 | struct ocfs2_dir_entry **dirent) | |
218 | { | |
219 | int status = -ENOENT; | |
ccd979bd | 220 | |
2b388c67 JB |
221 | mlog_entry("(name=%.*s, blkno=%p, inode=%p, dirent_bh=%p, dirent=%p)\n", |
222 | namelen, name, blkno, inode, dirent_bh, dirent); | |
ccd979bd MF |
223 | |
224 | *dirent_bh = ocfs2_find_entry(name, namelen, inode, dirent); | |
225 | if (!*dirent_bh || !*dirent) { | |
226 | status = -ENOENT; | |
227 | goto leave; | |
228 | } | |
229 | ||
230 | *blkno = le64_to_cpu((*dirent)->inode); | |
231 | ||
232 | status = 0; | |
233 | leave: | |
234 | if (status < 0) { | |
235 | *dirent = NULL; | |
236 | if (*dirent_bh) { | |
237 | brelse(*dirent_bh); | |
238 | *dirent_bh = NULL; | |
239 | } | |
240 | } | |
241 | ||
242 | mlog_exit(status); | |
243 | return status; | |
244 | } | |
245 | ||
246 | /* Check for a name within a directory. | |
247 | * | |
248 | * Return 0 if the name does not exist | |
249 | * Return -EEXIST if the directory contains the name | |
250 | * | |
1b1dcc1b | 251 | * Callers should have i_mutex + a cluster lock on dir |
ccd979bd MF |
252 | */ |
253 | int ocfs2_check_dir_for_entry(struct inode *dir, | |
254 | const char *name, | |
255 | int namelen) | |
256 | { | |
257 | int ret; | |
258 | struct buffer_head *dirent_bh = NULL; | |
259 | struct ocfs2_dir_entry *dirent = NULL; | |
260 | ||
b0697053 MF |
261 | mlog_entry("dir %llu, name '%.*s'\n", |
262 | (unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name); | |
ccd979bd MF |
263 | |
264 | ret = -EEXIST; | |
265 | dirent_bh = ocfs2_find_entry(name, namelen, dir, &dirent); | |
266 | if (dirent_bh) | |
267 | goto bail; | |
268 | ||
269 | ret = 0; | |
270 | bail: | |
271 | if (dirent_bh) | |
272 | brelse(dirent_bh); | |
273 | ||
274 | mlog_exit(ret); | |
275 | return ret; | |
276 | } | |
277 | ||
278 | /* | |
279 | * routine to check that the specified directory is empty (for rmdir) | |
280 | */ | |
281 | int ocfs2_empty_dir(struct inode *inode) | |
282 | { | |
283 | unsigned long offset; | |
284 | struct buffer_head * bh; | |
285 | struct ocfs2_dir_entry * de, * de1; | |
286 | struct super_block * sb; | |
287 | int err; | |
288 | ||
289 | sb = inode->i_sb; | |
290 | if ((i_size_read(inode) < | |
291 | (OCFS2_DIR_REC_LEN(1) + OCFS2_DIR_REC_LEN(2))) || | |
292 | !(bh = ocfs2_bread(inode, 0, &err, 0))) { | |
b0697053 MF |
293 | mlog(ML_ERROR, "bad directory (dir #%llu) - no data block\n", |
294 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
295 | return 1; |
296 | } | |
297 | ||
298 | de = (struct ocfs2_dir_entry *) bh->b_data; | |
299 | de1 = (struct ocfs2_dir_entry *) | |
300 | ((char *)de + le16_to_cpu(de->rec_len)); | |
301 | if ((le64_to_cpu(de->inode) != OCFS2_I(inode)->ip_blkno) || | |
302 | !le64_to_cpu(de1->inode) || | |
303 | strcmp(".", de->name) || | |
304 | strcmp("..", de1->name)) { | |
b0697053 MF |
305 | mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n", |
306 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
307 | brelse(bh); |
308 | return 1; | |
309 | } | |
310 | offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len); | |
311 | de = (struct ocfs2_dir_entry *)((char *)de1 + le16_to_cpu(de1->rec_len)); | |
312 | while (offset < i_size_read(inode) ) { | |
313 | if (!bh || (void *)de >= (void *)(bh->b_data + sb->s_blocksize)) { | |
314 | brelse(bh); | |
315 | bh = ocfs2_bread(inode, | |
316 | offset >> sb->s_blocksize_bits, &err, 0); | |
317 | if (!bh) { | |
b0697053 MF |
318 | mlog(ML_ERROR, "dir %llu has a hole at %lu\n", |
319 | (unsigned long long)OCFS2_I(inode)->ip_blkno, offset); | |
ccd979bd MF |
320 | offset += sb->s_blocksize; |
321 | continue; | |
322 | } | |
323 | de = (struct ocfs2_dir_entry *) bh->b_data; | |
324 | } | |
325 | if (!ocfs2_check_dir_entry(inode, de, bh, offset)) { | |
326 | brelse(bh); | |
327 | return 1; | |
328 | } | |
329 | if (le64_to_cpu(de->inode)) { | |
330 | brelse(bh); | |
331 | return 0; | |
332 | } | |
333 | offset += le16_to_cpu(de->rec_len); | |
334 | de = (struct ocfs2_dir_entry *) | |
335 | ((char *)de + le16_to_cpu(de->rec_len)); | |
336 | } | |
337 | brelse(bh); | |
338 | return 1; | |
339 | } | |
340 | ||
341 | /* returns a bh of the 1st new block in the allocation. */ | |
342 | int ocfs2_do_extend_dir(struct super_block *sb, | |
343 | struct ocfs2_journal_handle *handle, | |
344 | struct inode *dir, | |
345 | struct buffer_head *parent_fe_bh, | |
346 | struct ocfs2_alloc_context *data_ac, | |
347 | struct ocfs2_alloc_context *meta_ac, | |
348 | struct buffer_head **new_bh) | |
349 | { | |
350 | int status; | |
351 | int extend; | |
352 | u64 p_blkno; | |
353 | ||
354 | spin_lock(&OCFS2_I(dir)->ip_lock); | |
355 | extend = (i_size_read(dir) == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)); | |
356 | spin_unlock(&OCFS2_I(dir)->ip_lock); | |
357 | ||
358 | if (extend) { | |
359 | status = ocfs2_do_extend_allocation(OCFS2_SB(sb), dir, 1, | |
360 | parent_fe_bh, handle, | |
361 | data_ac, meta_ac, NULL); | |
362 | BUG_ON(status == -EAGAIN); | |
363 | if (status < 0) { | |
364 | mlog_errno(status); | |
365 | goto bail; | |
366 | } | |
367 | } | |
368 | ||
369 | status = ocfs2_extent_map_get_blocks(dir, (dir->i_blocks >> | |
370 | (sb->s_blocksize_bits - 9)), | |
371 | 1, &p_blkno, NULL); | |
372 | if (status < 0) { | |
373 | mlog_errno(status); | |
374 | goto bail; | |
375 | } | |
376 | ||
377 | *new_bh = sb_getblk(sb, p_blkno); | |
378 | if (!*new_bh) { | |
379 | status = -EIO; | |
380 | mlog_errno(status); | |
381 | goto bail; | |
382 | } | |
383 | status = 0; | |
384 | bail: | |
385 | mlog_exit(status); | |
386 | return status; | |
387 | } | |
388 | ||
389 | /* assumes you already have a cluster lock on the directory. */ | |
390 | static int ocfs2_extend_dir(struct ocfs2_super *osb, | |
391 | struct inode *dir, | |
392 | struct buffer_head *parent_fe_bh, | |
393 | struct buffer_head **new_de_bh) | |
394 | { | |
395 | int status = 0; | |
396 | int credits, num_free_extents; | |
397 | loff_t dir_i_size; | |
398 | struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data; | |
399 | struct ocfs2_alloc_context *data_ac = NULL; | |
400 | struct ocfs2_alloc_context *meta_ac = NULL; | |
401 | struct ocfs2_journal_handle *handle = NULL; | |
402 | struct buffer_head *new_bh = NULL; | |
403 | struct ocfs2_dir_entry * de; | |
404 | struct super_block *sb = osb->sb; | |
405 | ||
406 | mlog_entry_void(); | |
407 | ||
408 | dir_i_size = i_size_read(dir); | |
b0697053 MF |
409 | mlog(0, "extending dir %llu (i_size = %lld)\n", |
410 | (unsigned long long)OCFS2_I(dir)->ip_blkno, dir_i_size); | |
ccd979bd | 411 | |
ccd979bd MF |
412 | /* dir->i_size is always block aligned. */ |
413 | spin_lock(&OCFS2_I(dir)->ip_lock); | |
414 | if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) { | |
415 | spin_unlock(&OCFS2_I(dir)->ip_lock); | |
416 | num_free_extents = ocfs2_num_free_extents(osb, dir, fe); | |
417 | if (num_free_extents < 0) { | |
418 | status = num_free_extents; | |
419 | mlog_errno(status); | |
420 | goto bail; | |
421 | } | |
422 | ||
423 | if (!num_free_extents) { | |
da5cbf2f | 424 | status = ocfs2_reserve_new_metadata(osb, fe, &meta_ac); |
ccd979bd MF |
425 | if (status < 0) { |
426 | if (status != -ENOSPC) | |
427 | mlog_errno(status); | |
428 | goto bail; | |
429 | } | |
430 | } | |
431 | ||
da5cbf2f | 432 | status = ocfs2_reserve_clusters(osb, 1, &data_ac); |
ccd979bd MF |
433 | if (status < 0) { |
434 | if (status != -ENOSPC) | |
435 | mlog_errno(status); | |
436 | goto bail; | |
437 | } | |
438 | ||
439 | credits = ocfs2_calc_extend_credits(sb, fe, 1); | |
440 | } else { | |
441 | spin_unlock(&OCFS2_I(dir)->ip_lock); | |
442 | credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS; | |
443 | } | |
444 | ||
da5cbf2f | 445 | handle = ocfs2_start_trans(osb, NULL, credits); |
ccd979bd MF |
446 | if (IS_ERR(handle)) { |
447 | status = PTR_ERR(handle); | |
448 | handle = NULL; | |
449 | mlog_errno(status); | |
450 | goto bail; | |
451 | } | |
452 | ||
453 | status = ocfs2_do_extend_dir(osb->sb, handle, dir, parent_fe_bh, | |
454 | data_ac, meta_ac, &new_bh); | |
455 | if (status < 0) { | |
456 | mlog_errno(status); | |
457 | goto bail; | |
458 | } | |
459 | ||
460 | ocfs2_set_new_buffer_uptodate(dir, new_bh); | |
461 | ||
462 | status = ocfs2_journal_access(handle, dir, new_bh, | |
463 | OCFS2_JOURNAL_ACCESS_CREATE); | |
464 | if (status < 0) { | |
465 | mlog_errno(status); | |
466 | goto bail; | |
467 | } | |
468 | memset(new_bh->b_data, 0, sb->s_blocksize); | |
469 | de = (struct ocfs2_dir_entry *) new_bh->b_data; | |
470 | de->inode = 0; | |
471 | de->rec_len = cpu_to_le16(sb->s_blocksize); | |
472 | status = ocfs2_journal_dirty(handle, new_bh); | |
473 | if (status < 0) { | |
474 | mlog_errno(status); | |
475 | goto bail; | |
476 | } | |
477 | ||
478 | dir_i_size += dir->i_sb->s_blocksize; | |
479 | i_size_write(dir, dir_i_size); | |
480 | dir->i_blocks = ocfs2_align_bytes_to_sectors(dir_i_size); | |
481 | status = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh); | |
482 | if (status < 0) { | |
483 | mlog_errno(status); | |
484 | goto bail; | |
485 | } | |
486 | ||
487 | *new_de_bh = new_bh; | |
488 | get_bh(*new_de_bh); | |
489 | bail: | |
490 | if (handle) | |
02dc1af4 | 491 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
492 | |
493 | if (data_ac) | |
494 | ocfs2_free_alloc_context(data_ac); | |
495 | if (meta_ac) | |
496 | ocfs2_free_alloc_context(meta_ac); | |
497 | ||
498 | if (new_bh) | |
499 | brelse(new_bh); | |
500 | ||
501 | mlog_exit(status); | |
502 | return status; | |
503 | } | |
504 | ||
505 | /* | |
506 | * Search the dir for a good spot, extending it if necessary. The | |
507 | * block containing an appropriate record is returned in ret_de_bh. | |
508 | */ | |
509 | int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb, | |
510 | struct inode *dir, | |
511 | struct buffer_head *parent_fe_bh, | |
512 | const char *name, | |
513 | int namelen, | |
514 | struct buffer_head **ret_de_bh) | |
515 | { | |
516 | unsigned long offset; | |
517 | struct buffer_head * bh = NULL; | |
518 | unsigned short rec_len; | |
519 | struct ocfs2_dinode *fe; | |
520 | struct ocfs2_dir_entry *de; | |
521 | struct super_block *sb; | |
522 | int status; | |
523 | ||
524 | mlog_entry_void(); | |
525 | ||
b0697053 MF |
526 | mlog(0, "getting ready to insert namelen %d into dir %llu\n", |
527 | namelen, (unsigned long long)OCFS2_I(dir)->ip_blkno); | |
ccd979bd MF |
528 | |
529 | BUG_ON(!S_ISDIR(dir->i_mode)); | |
530 | fe = (struct ocfs2_dinode *) parent_fe_bh->b_data; | |
531 | BUG_ON(le64_to_cpu(fe->i_size) != i_size_read(dir)); | |
532 | ||
533 | sb = dir->i_sb; | |
534 | ||
535 | if (!namelen) { | |
536 | status = -EINVAL; | |
537 | mlog_errno(status); | |
538 | goto bail; | |
539 | } | |
540 | ||
541 | bh = ocfs2_bread(dir, 0, &status, 0); | |
542 | if (!bh) { | |
543 | mlog_errno(status); | |
544 | goto bail; | |
545 | } | |
546 | ||
547 | rec_len = OCFS2_DIR_REC_LEN(namelen); | |
548 | offset = 0; | |
549 | de = (struct ocfs2_dir_entry *) bh->b_data; | |
550 | while (1) { | |
551 | if ((char *)de >= sb->s_blocksize + bh->b_data) { | |
552 | brelse(bh); | |
553 | bh = NULL; | |
554 | ||
555 | if (i_size_read(dir) <= offset) { | |
556 | status = ocfs2_extend_dir(osb, | |
557 | dir, | |
558 | parent_fe_bh, | |
559 | &bh); | |
560 | if (status < 0) { | |
561 | mlog_errno(status); | |
562 | goto bail; | |
563 | } | |
564 | BUG_ON(!bh); | |
565 | *ret_de_bh = bh; | |
566 | get_bh(*ret_de_bh); | |
567 | goto bail; | |
568 | } | |
569 | bh = ocfs2_bread(dir, | |
570 | offset >> sb->s_blocksize_bits, | |
571 | &status, | |
572 | 0); | |
573 | if (!bh) { | |
574 | mlog_errno(status); | |
575 | goto bail; | |
576 | } | |
577 | /* move to next block */ | |
578 | de = (struct ocfs2_dir_entry *) bh->b_data; | |
579 | } | |
580 | if (!ocfs2_check_dir_entry(dir, de, bh, offset)) { | |
581 | status = -ENOENT; | |
582 | goto bail; | |
583 | } | |
584 | if (ocfs2_match(namelen, name, de)) { | |
585 | status = -EEXIST; | |
586 | goto bail; | |
587 | } | |
588 | if (((le64_to_cpu(de->inode) == 0) && | |
589 | (le16_to_cpu(de->rec_len) >= rec_len)) || | |
590 | (le16_to_cpu(de->rec_len) >= | |
591 | (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) { | |
592 | /* Ok, we found a spot. Return this bh and let | |
593 | * the caller actually fill it in. */ | |
594 | *ret_de_bh = bh; | |
595 | get_bh(*ret_de_bh); | |
596 | status = 0; | |
597 | goto bail; | |
598 | } | |
599 | offset += le16_to_cpu(de->rec_len); | |
600 | de = (struct ocfs2_dir_entry *)((char *) de + le16_to_cpu(de->rec_len)); | |
601 | } | |
602 | ||
603 | status = 0; | |
604 | bail: | |
605 | if (bh) | |
606 | brelse(bh); | |
607 | ||
608 | mlog_exit(status); | |
609 | return status; | |
610 | } |