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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" | |
316f4b9f | 58 | #include "super.h" |
ccd979bd MF |
59 | #include "uptodate.h" |
60 | ||
61 | #include "buffer_head_io.h" | |
62 | ||
316f4b9f MF |
63 | #define NAMEI_RA_CHUNKS 2 |
64 | #define NAMEI_RA_BLOCKS 4 | |
65 | #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) | |
66 | #define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b)) | |
67 | ||
ccd979bd MF |
68 | static unsigned char ocfs2_filetype_table[] = { |
69 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
70 | }; | |
71 | ||
72 | static int ocfs2_extend_dir(struct ocfs2_super *osb, | |
73 | struct inode *dir, | |
74 | struct buffer_head *parent_fe_bh, | |
75 | struct buffer_head **new_de_bh); | |
316f4b9f MF |
76 | static int ocfs2_do_extend_dir(struct super_block *sb, |
77 | handle_t *handle, | |
78 | struct inode *dir, | |
79 | struct buffer_head *parent_fe_bh, | |
80 | struct ocfs2_alloc_context *data_ac, | |
81 | struct ocfs2_alloc_context *meta_ac, | |
82 | struct buffer_head **new_bh); | |
83 | ||
5eae5b96 MF |
84 | static int ocfs2_check_dir_entry(struct inode * dir, |
85 | struct ocfs2_dir_entry * de, | |
86 | struct buffer_head * bh, | |
87 | unsigned long offset) | |
316f4b9f MF |
88 | { |
89 | const char *error_msg = NULL; | |
90 | const int rlen = le16_to_cpu(de->rec_len); | |
91 | ||
92 | if (rlen < OCFS2_DIR_REC_LEN(1)) | |
93 | error_msg = "rec_len is smaller than minimal"; | |
94 | else if (rlen % 4 != 0) | |
95 | error_msg = "rec_len % 4 != 0"; | |
96 | else if (rlen < OCFS2_DIR_REC_LEN(de->name_len)) | |
97 | error_msg = "rec_len is too small for name_len"; | |
98 | else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize) | |
99 | error_msg = "directory entry across blocks"; | |
100 | ||
101 | if (error_msg != NULL) | |
102 | mlog(ML_ERROR, "bad entry in directory #%llu: %s - " | |
103 | "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n", | |
104 | (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg, | |
105 | offset, (unsigned long long)le64_to_cpu(de->inode), rlen, | |
106 | de->name_len); | |
107 | return error_msg == NULL ? 1 : 0; | |
108 | } | |
109 | ||
110 | static inline int ocfs2_match(int len, | |
111 | const char * const name, | |
112 | struct ocfs2_dir_entry *de) | |
113 | { | |
114 | if (len != de->name_len) | |
115 | return 0; | |
116 | if (!de->inode) | |
117 | return 0; | |
118 | return !memcmp(name, de->name, len); | |
119 | } | |
120 | ||
121 | /* | |
122 | * Returns 0 if not found, -1 on failure, and 1 on success | |
123 | */ | |
124 | static int inline ocfs2_search_dirblock(struct buffer_head *bh, | |
125 | struct inode *dir, | |
126 | const char *name, int namelen, | |
127 | unsigned long offset, | |
128 | struct ocfs2_dir_entry **res_dir) | |
129 | { | |
130 | struct ocfs2_dir_entry *de; | |
131 | char *dlimit, *de_buf; | |
132 | int de_len; | |
133 | int ret = 0; | |
134 | ||
135 | mlog_entry_void(); | |
136 | ||
137 | de_buf = bh->b_data; | |
138 | dlimit = de_buf + dir->i_sb->s_blocksize; | |
139 | ||
140 | while (de_buf < dlimit) { | |
141 | /* this code is executed quadratically often */ | |
142 | /* do minimal checking `by hand' */ | |
143 | ||
144 | de = (struct ocfs2_dir_entry *) de_buf; | |
145 | ||
146 | if (de_buf + namelen <= dlimit && | |
147 | ocfs2_match(namelen, name, de)) { | |
148 | /* found a match - just to be sure, do a full check */ | |
149 | if (!ocfs2_check_dir_entry(dir, de, bh, offset)) { | |
150 | ret = -1; | |
151 | goto bail; | |
152 | } | |
153 | *res_dir = de; | |
154 | ret = 1; | |
155 | goto bail; | |
156 | } | |
157 | ||
158 | /* prevent looping on a bad block */ | |
159 | de_len = le16_to_cpu(de->rec_len); | |
160 | if (de_len <= 0) { | |
161 | ret = -1; | |
162 | goto bail; | |
163 | } | |
164 | ||
165 | de_buf += de_len; | |
166 | offset += de_len; | |
167 | } | |
168 | ||
169 | bail: | |
170 | mlog_exit(ret); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | struct buffer_head *ocfs2_find_entry(const char *name, int namelen, | |
175 | struct inode *dir, | |
176 | struct ocfs2_dir_entry **res_dir) | |
177 | { | |
178 | struct super_block *sb; | |
179 | struct buffer_head *bh_use[NAMEI_RA_SIZE]; | |
180 | struct buffer_head *bh, *ret = NULL; | |
181 | unsigned long start, block, b; | |
182 | int ra_max = 0; /* Number of bh's in the readahead | |
183 | buffer, bh_use[] */ | |
184 | int ra_ptr = 0; /* Current index into readahead | |
185 | buffer */ | |
186 | int num = 0; | |
187 | int nblocks, i, err; | |
188 | ||
189 | mlog_entry_void(); | |
190 | ||
191 | *res_dir = NULL; | |
192 | sb = dir->i_sb; | |
193 | ||
194 | nblocks = i_size_read(dir) >> sb->s_blocksize_bits; | |
195 | start = OCFS2_I(dir)->ip_dir_start_lookup; | |
196 | if (start >= nblocks) | |
197 | start = 0; | |
198 | block = start; | |
199 | ||
200 | restart: | |
201 | do { | |
202 | /* | |
203 | * We deal with the read-ahead logic here. | |
204 | */ | |
205 | if (ra_ptr >= ra_max) { | |
206 | /* Refill the readahead buffer */ | |
207 | ra_ptr = 0; | |
208 | b = block; | |
209 | for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) { | |
210 | /* | |
211 | * Terminate if we reach the end of the | |
212 | * directory and must wrap, or if our | |
213 | * search has finished at this block. | |
214 | */ | |
215 | if (b >= nblocks || (num && block == start)) { | |
216 | bh_use[ra_max] = NULL; | |
217 | break; | |
218 | } | |
219 | num++; | |
220 | ||
221 | bh = ocfs2_bread(dir, b++, &err, 1); | |
222 | bh_use[ra_max] = bh; | |
223 | } | |
224 | } | |
225 | if ((bh = bh_use[ra_ptr++]) == NULL) | |
226 | goto next; | |
227 | wait_on_buffer(bh); | |
228 | if (!buffer_uptodate(bh)) { | |
229 | /* read error, skip block & hope for the best */ | |
230 | ocfs2_error(dir->i_sb, "reading directory %llu, " | |
231 | "offset %lu\n", | |
232 | (unsigned long long)OCFS2_I(dir)->ip_blkno, | |
233 | block); | |
234 | brelse(bh); | |
235 | goto next; | |
236 | } | |
237 | i = ocfs2_search_dirblock(bh, dir, name, namelen, | |
238 | block << sb->s_blocksize_bits, | |
239 | res_dir); | |
240 | if (i == 1) { | |
241 | OCFS2_I(dir)->ip_dir_start_lookup = block; | |
242 | ret = bh; | |
243 | goto cleanup_and_exit; | |
244 | } else { | |
245 | brelse(bh); | |
246 | if (i < 0) | |
247 | goto cleanup_and_exit; | |
248 | } | |
249 | next: | |
250 | if (++block >= nblocks) | |
251 | block = 0; | |
252 | } while (block != start); | |
253 | ||
254 | /* | |
255 | * If the directory has grown while we were searching, then | |
256 | * search the last part of the directory before giving up. | |
257 | */ | |
258 | block = nblocks; | |
259 | nblocks = i_size_read(dir) >> sb->s_blocksize_bits; | |
260 | if (block < nblocks) { | |
261 | start = 0; | |
262 | goto restart; | |
263 | } | |
264 | ||
265 | cleanup_and_exit: | |
266 | /* Clean up the read-ahead blocks */ | |
267 | for (; ra_ptr < ra_max; ra_ptr++) | |
268 | brelse(bh_use[ra_ptr]); | |
269 | ||
270 | mlog_exit_ptr(ret); | |
271 | return ret; | |
272 | } | |
273 | ||
38760e24 MF |
274 | int ocfs2_update_entry(struct inode *dir, handle_t *handle, |
275 | struct buffer_head *de_bh, struct ocfs2_dir_entry *de, | |
276 | struct inode *new_entry_inode) | |
277 | { | |
278 | int ret; | |
279 | ||
280 | ret = ocfs2_journal_access(handle, dir, de_bh, | |
281 | OCFS2_JOURNAL_ACCESS_WRITE); | |
282 | if (ret) { | |
283 | mlog_errno(ret); | |
284 | goto out; | |
285 | } | |
286 | ||
287 | de->inode = cpu_to_le64(OCFS2_I(new_entry_inode)->ip_blkno); | |
288 | ocfs2_set_de_type(de, new_entry_inode->i_mode); | |
289 | ||
290 | ocfs2_journal_dirty(handle, de_bh); | |
291 | ||
292 | out: | |
293 | return ret; | |
294 | } | |
295 | ||
316f4b9f MF |
296 | /* |
297 | * ocfs2_delete_entry deletes a directory entry by merging it with the | |
298 | * previous entry | |
299 | */ | |
300 | int ocfs2_delete_entry(handle_t *handle, | |
301 | struct inode *dir, | |
302 | struct ocfs2_dir_entry *de_del, | |
303 | struct buffer_head *bh) | |
304 | { | |
305 | struct ocfs2_dir_entry *de, *pde; | |
306 | int i, status = -ENOENT; | |
307 | ||
308 | mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh); | |
309 | ||
310 | i = 0; | |
311 | pde = NULL; | |
312 | de = (struct ocfs2_dir_entry *) bh->b_data; | |
313 | while (i < bh->b_size) { | |
314 | if (!ocfs2_check_dir_entry(dir, de, bh, i)) { | |
315 | status = -EIO; | |
316 | mlog_errno(status); | |
317 | goto bail; | |
318 | } | |
319 | if (de == de_del) { | |
320 | status = ocfs2_journal_access(handle, dir, bh, | |
321 | OCFS2_JOURNAL_ACCESS_WRITE); | |
322 | if (status < 0) { | |
323 | status = -EIO; | |
324 | mlog_errno(status); | |
325 | goto bail; | |
326 | } | |
327 | if (pde) | |
328 | pde->rec_len = | |
329 | cpu_to_le16(le16_to_cpu(pde->rec_len) + | |
330 | le16_to_cpu(de->rec_len)); | |
331 | else | |
332 | de->inode = 0; | |
333 | dir->i_version++; | |
334 | status = ocfs2_journal_dirty(handle, bh); | |
335 | goto bail; | |
336 | } | |
337 | i += le16_to_cpu(de->rec_len); | |
338 | pde = de; | |
339 | de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len)); | |
340 | } | |
341 | bail: | |
342 | mlog_exit(status); | |
343 | return status; | |
344 | } | |
345 | ||
8553cf4f MF |
346 | /* |
347 | * Check whether 'de' has enough room to hold an entry of | |
348 | * 'new_rec_len' bytes. | |
349 | */ | |
350 | static inline int ocfs2_dirent_would_fit(struct ocfs2_dir_entry *de, | |
351 | unsigned int new_rec_len) | |
352 | { | |
353 | unsigned int de_really_used; | |
354 | ||
355 | /* Check whether this is an empty record with enough space */ | |
356 | if (le64_to_cpu(de->inode) == 0 && | |
357 | le16_to_cpu(de->rec_len) >= new_rec_len) | |
358 | return 1; | |
359 | ||
360 | /* | |
361 | * Record might have free space at the end which we can | |
362 | * use. | |
363 | */ | |
364 | de_really_used = OCFS2_DIR_REC_LEN(de->name_len); | |
365 | if (le16_to_cpu(de->rec_len) >= (de_really_used + new_rec_len)) | |
366 | return 1; | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
316f4b9f MF |
371 | /* we don't always have a dentry for what we want to add, so people |
372 | * like orphan dir can call this instead. | |
373 | * | |
374 | * If you pass me insert_bh, I'll skip the search of the other dir | |
375 | * blocks and put the record in there. | |
376 | */ | |
377 | int __ocfs2_add_entry(handle_t *handle, | |
378 | struct inode *dir, | |
379 | const char *name, int namelen, | |
380 | struct inode *inode, u64 blkno, | |
381 | struct buffer_head *parent_fe_bh, | |
382 | struct buffer_head *insert_bh) | |
383 | { | |
384 | unsigned long offset; | |
385 | unsigned short rec_len; | |
386 | struct ocfs2_dir_entry *de, *de1; | |
387 | struct super_block *sb; | |
388 | int retval, status; | |
389 | ||
390 | mlog_entry_void(); | |
391 | ||
392 | sb = dir->i_sb; | |
393 | ||
394 | if (!namelen) | |
395 | return -EINVAL; | |
396 | ||
397 | rec_len = OCFS2_DIR_REC_LEN(namelen); | |
398 | offset = 0; | |
399 | de = (struct ocfs2_dir_entry *) insert_bh->b_data; | |
400 | while (1) { | |
401 | BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data); | |
402 | /* These checks should've already been passed by the | |
403 | * prepare function, but I guess we can leave them | |
404 | * here anyway. */ | |
405 | if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) { | |
406 | retval = -ENOENT; | |
407 | goto bail; | |
408 | } | |
409 | if (ocfs2_match(namelen, name, de)) { | |
410 | retval = -EEXIST; | |
411 | goto bail; | |
412 | } | |
8553cf4f MF |
413 | |
414 | if (ocfs2_dirent_would_fit(de, rec_len)) { | |
316f4b9f MF |
415 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
416 | retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh); | |
417 | if (retval < 0) { | |
418 | mlog_errno(retval); | |
419 | goto bail; | |
420 | } | |
421 | ||
422 | status = ocfs2_journal_access(handle, dir, insert_bh, | |
423 | OCFS2_JOURNAL_ACCESS_WRITE); | |
424 | /* By now the buffer is marked for journaling */ | |
425 | offset += le16_to_cpu(de->rec_len); | |
426 | if (le64_to_cpu(de->inode)) { | |
427 | de1 = (struct ocfs2_dir_entry *)((char *) de + | |
428 | OCFS2_DIR_REC_LEN(de->name_len)); | |
429 | de1->rec_len = | |
430 | cpu_to_le16(le16_to_cpu(de->rec_len) - | |
431 | OCFS2_DIR_REC_LEN(de->name_len)); | |
432 | de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len)); | |
433 | de = de1; | |
434 | } | |
435 | de->file_type = OCFS2_FT_UNKNOWN; | |
436 | if (blkno) { | |
437 | de->inode = cpu_to_le64(blkno); | |
438 | ocfs2_set_de_type(de, inode->i_mode); | |
439 | } else | |
440 | de->inode = 0; | |
441 | de->name_len = namelen; | |
442 | memcpy(de->name, name, namelen); | |
443 | ||
444 | dir->i_version++; | |
445 | status = ocfs2_journal_dirty(handle, insert_bh); | |
446 | retval = 0; | |
447 | goto bail; | |
448 | } | |
449 | offset += le16_to_cpu(de->rec_len); | |
450 | de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len)); | |
451 | } | |
452 | ||
453 | /* when you think about it, the assert above should prevent us | |
454 | * from ever getting here. */ | |
455 | retval = -ENOSPC; | |
456 | bail: | |
457 | ||
458 | mlog_exit(retval); | |
459 | return retval; | |
460 | } | |
461 | ||
b8bc5f4f MF |
462 | static int ocfs2_dir_foreach_blk(struct inode *inode, unsigned long *f_version, |
463 | loff_t *f_pos, void *priv, filldir_t filldir) | |
ccd979bd MF |
464 | { |
465 | int error = 0; | |
aa958874 MF |
466 | unsigned long offset, blk, last_ra_blk = 0; |
467 | int i, stored; | |
ccd979bd MF |
468 | struct buffer_head * bh, * tmp; |
469 | struct ocfs2_dir_entry * de; | |
470 | int err; | |
ccd979bd | 471 | struct super_block * sb = inode->i_sb; |
aa958874 | 472 | unsigned int ra_sectors = 16; |
ccd979bd MF |
473 | |
474 | stored = 0; | |
475 | bh = NULL; | |
476 | ||
b8bc5f4f | 477 | offset = (*f_pos) & (sb->s_blocksize - 1); |
ccd979bd | 478 | |
b8bc5f4f MF |
479 | while (!error && !stored && *f_pos < i_size_read(inode)) { |
480 | blk = (*f_pos) >> sb->s_blocksize_bits; | |
ccd979bd MF |
481 | bh = ocfs2_bread(inode, blk, &err, 0); |
482 | if (!bh) { | |
b0697053 MF |
483 | mlog(ML_ERROR, |
484 | "directory #%llu contains a hole at offset %lld\n", | |
485 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
b8bc5f4f MF |
486 | *f_pos); |
487 | *f_pos += sb->s_blocksize - offset; | |
ccd979bd MF |
488 | continue; |
489 | } | |
490 | ||
aa958874 MF |
491 | /* The idea here is to begin with 8k read-ahead and to stay |
492 | * 4k ahead of our current position. | |
493 | * | |
494 | * TODO: Use the pagecache for this. We just need to | |
495 | * make sure it's cluster-safe... */ | |
496 | if (!last_ra_blk | |
497 | || (((last_ra_blk - blk) << 9) <= (ra_sectors / 2))) { | |
498 | for (i = ra_sectors >> (sb->s_blocksize_bits - 9); | |
ccd979bd MF |
499 | i > 0; i--) { |
500 | tmp = ocfs2_bread(inode, ++blk, &err, 1); | |
501 | if (tmp) | |
502 | brelse(tmp); | |
503 | } | |
aa958874 MF |
504 | last_ra_blk = blk; |
505 | ra_sectors = 8; | |
ccd979bd MF |
506 | } |
507 | ||
508 | revalidate: | |
509 | /* If the dir block has changed since the last call to | |
510 | * readdir(2), then we might be pointing to an invalid | |
511 | * dirent right now. Scan from the start of the block | |
512 | * to make sure. */ | |
b8bc5f4f | 513 | if (*f_version != inode->i_version) { |
ccd979bd MF |
514 | for (i = 0; i < sb->s_blocksize && i < offset; ) { |
515 | de = (struct ocfs2_dir_entry *) (bh->b_data + i); | |
516 | /* It's too expensive to do a full | |
517 | * dirent test each time round this | |
518 | * loop, but we do have to test at | |
519 | * least that it is non-zero. A | |
520 | * failure will be detected in the | |
521 | * dirent test below. */ | |
522 | if (le16_to_cpu(de->rec_len) < | |
523 | OCFS2_DIR_REC_LEN(1)) | |
524 | break; | |
525 | i += le16_to_cpu(de->rec_len); | |
526 | } | |
527 | offset = i; | |
b8bc5f4f | 528 | *f_pos = ((*f_pos) & ~(sb->s_blocksize - 1)) |
ccd979bd | 529 | | offset; |
b8bc5f4f | 530 | *f_version = inode->i_version; |
ccd979bd MF |
531 | } |
532 | ||
b8bc5f4f | 533 | while (!error && *f_pos < i_size_read(inode) |
ccd979bd MF |
534 | && offset < sb->s_blocksize) { |
535 | de = (struct ocfs2_dir_entry *) (bh->b_data + offset); | |
536 | if (!ocfs2_check_dir_entry(inode, de, bh, offset)) { | |
537 | /* On error, skip the f_pos to the | |
538 | next block. */ | |
b8bc5f4f | 539 | *f_pos = ((*f_pos) | (sb->s_blocksize - 1)) + 1; |
ccd979bd | 540 | brelse(bh); |
b8bc5f4f | 541 | goto out; |
ccd979bd MF |
542 | } |
543 | offset += le16_to_cpu(de->rec_len); | |
544 | if (le64_to_cpu(de->inode)) { | |
545 | /* We might block in the next section | |
546 | * if the data destination is | |
547 | * currently swapped out. So, use a | |
548 | * version stamp to detect whether or | |
549 | * not the directory has been modified | |
550 | * during the copy operation. | |
551 | */ | |
b8bc5f4f | 552 | unsigned long version = *f_version; |
ccd979bd MF |
553 | unsigned char d_type = DT_UNKNOWN; |
554 | ||
555 | if (de->file_type < OCFS2_FT_MAX) | |
556 | d_type = ocfs2_filetype_table[de->file_type]; | |
b8bc5f4f | 557 | error = filldir(priv, de->name, |
ccd979bd | 558 | de->name_len, |
b8bc5f4f | 559 | *f_pos, |
7e853679 | 560 | le64_to_cpu(de->inode), |
ccd979bd MF |
561 | d_type); |
562 | if (error) | |
563 | break; | |
b8bc5f4f | 564 | if (version != *f_version) |
ccd979bd MF |
565 | goto revalidate; |
566 | stored ++; | |
567 | } | |
b8bc5f4f | 568 | *f_pos += le16_to_cpu(de->rec_len); |
ccd979bd MF |
569 | } |
570 | offset = 0; | |
571 | brelse(bh); | |
572 | } | |
573 | ||
574 | stored = 0; | |
b8bc5f4f MF |
575 | out: |
576 | return stored; | |
577 | } | |
578 | ||
5eae5b96 MF |
579 | /* |
580 | * This is intended to be called from inside other kernel functions, | |
581 | * so we fake some arguments. | |
582 | */ | |
583 | int ocfs2_dir_foreach(struct inode *inode, loff_t *f_pos, void *priv, | |
584 | filldir_t filldir) | |
585 | { | |
586 | int ret = 0; | |
587 | unsigned long version = inode->i_version; | |
588 | ||
589 | while (*f_pos < i_size_read(inode)) { | |
590 | ret = ocfs2_dir_foreach_blk(inode, &version, f_pos, priv, | |
591 | filldir); | |
592 | if (ret) | |
593 | break; | |
594 | } | |
595 | ||
596 | return 0; | |
597 | } | |
598 | ||
b8bc5f4f MF |
599 | /* |
600 | * ocfs2_readdir() | |
601 | * | |
602 | */ | |
603 | int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
604 | { | |
605 | int error = 0; | |
606 | struct inode *inode = filp->f_path.dentry->d_inode; | |
607 | int lock_level = 0; | |
608 | ||
609 | mlog_entry("dirino=%llu\n", | |
610 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
611 | ||
612 | error = ocfs2_meta_lock_atime(inode, filp->f_vfsmnt, &lock_level); | |
613 | if (lock_level && error >= 0) { | |
614 | /* We release EX lock which used to update atime | |
615 | * and get PR lock again to reduce contention | |
616 | * on commonly accessed directories. */ | |
617 | ocfs2_meta_unlock(inode, 1); | |
618 | lock_level = 0; | |
619 | error = ocfs2_meta_lock(inode, NULL, 0); | |
620 | } | |
621 | if (error < 0) { | |
622 | if (error != -ENOENT) | |
623 | mlog_errno(error); | |
624 | /* we haven't got any yet, so propagate the error. */ | |
625 | goto bail_nolock; | |
626 | } | |
627 | ||
628 | error = ocfs2_dir_foreach_blk(inode, &filp->f_version, &filp->f_pos, | |
629 | dirent, filldir); | |
630 | ||
25899dee | 631 | ocfs2_meta_unlock(inode, lock_level); |
ccd979bd | 632 | |
aa958874 | 633 | bail_nolock: |
b8bc5f4f | 634 | mlog_exit(error); |
ccd979bd | 635 | |
b8bc5f4f | 636 | return error; |
ccd979bd MF |
637 | } |
638 | ||
639 | /* | |
1b1dcc1b | 640 | * NOTE: this should always be called with parent dir i_mutex taken. |
ccd979bd MF |
641 | */ |
642 | int ocfs2_find_files_on_disk(const char *name, | |
643 | int namelen, | |
644 | u64 *blkno, | |
645 | struct inode *inode, | |
646 | struct buffer_head **dirent_bh, | |
647 | struct ocfs2_dir_entry **dirent) | |
648 | { | |
649 | int status = -ENOENT; | |
ccd979bd | 650 | |
2b388c67 JB |
651 | mlog_entry("(name=%.*s, blkno=%p, inode=%p, dirent_bh=%p, dirent=%p)\n", |
652 | namelen, name, blkno, inode, dirent_bh, dirent); | |
ccd979bd MF |
653 | |
654 | *dirent_bh = ocfs2_find_entry(name, namelen, inode, dirent); | |
655 | if (!*dirent_bh || !*dirent) { | |
656 | status = -ENOENT; | |
657 | goto leave; | |
658 | } | |
659 | ||
660 | *blkno = le64_to_cpu((*dirent)->inode); | |
661 | ||
662 | status = 0; | |
663 | leave: | |
664 | if (status < 0) { | |
665 | *dirent = NULL; | |
666 | if (*dirent_bh) { | |
667 | brelse(*dirent_bh); | |
668 | *dirent_bh = NULL; | |
669 | } | |
670 | } | |
671 | ||
672 | mlog_exit(status); | |
673 | return status; | |
674 | } | |
675 | ||
be94d117 MF |
676 | /* |
677 | * Convenience function for callers which just want the block number | |
678 | * mapped to a name and don't require the full dirent info, etc. | |
679 | */ | |
680 | int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name, | |
681 | int namelen, u64 *blkno) | |
682 | { | |
683 | int ret; | |
684 | struct buffer_head *bh = NULL; | |
685 | struct ocfs2_dir_entry *dirent = NULL; | |
686 | ||
687 | ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &bh, &dirent); | |
688 | brelse(bh); | |
689 | ||
690 | return ret; | |
691 | } | |
692 | ||
ccd979bd MF |
693 | /* Check for a name within a directory. |
694 | * | |
695 | * Return 0 if the name does not exist | |
696 | * Return -EEXIST if the directory contains the name | |
697 | * | |
1b1dcc1b | 698 | * Callers should have i_mutex + a cluster lock on dir |
ccd979bd MF |
699 | */ |
700 | int ocfs2_check_dir_for_entry(struct inode *dir, | |
701 | const char *name, | |
702 | int namelen) | |
703 | { | |
704 | int ret; | |
705 | struct buffer_head *dirent_bh = NULL; | |
706 | struct ocfs2_dir_entry *dirent = NULL; | |
707 | ||
b0697053 MF |
708 | mlog_entry("dir %llu, name '%.*s'\n", |
709 | (unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name); | |
ccd979bd MF |
710 | |
711 | ret = -EEXIST; | |
712 | dirent_bh = ocfs2_find_entry(name, namelen, dir, &dirent); | |
713 | if (dirent_bh) | |
714 | goto bail; | |
715 | ||
716 | ret = 0; | |
717 | bail: | |
718 | if (dirent_bh) | |
719 | brelse(dirent_bh); | |
720 | ||
721 | mlog_exit(ret); | |
722 | return ret; | |
723 | } | |
724 | ||
0bfbbf62 MF |
725 | struct ocfs2_empty_dir_priv { |
726 | unsigned seen_dot; | |
727 | unsigned seen_dot_dot; | |
728 | unsigned seen_other; | |
729 | }; | |
730 | static int ocfs2_empty_dir_filldir(void *priv, const char *name, int name_len, | |
731 | loff_t pos, u64 ino, unsigned type) | |
732 | { | |
733 | struct ocfs2_empty_dir_priv *p = priv; | |
734 | ||
735 | /* | |
736 | * Check the positions of "." and ".." records to be sure | |
737 | * they're in the correct place. | |
738 | */ | |
739 | if (name_len == 1 && !strncmp(".", name, 1) && pos == 0) { | |
740 | p->seen_dot = 1; | |
741 | return 0; | |
742 | } | |
743 | ||
744 | if (name_len == 2 && !strncmp("..", name, 2) && | |
745 | pos == OCFS2_DIR_REC_LEN(1)) { | |
746 | p->seen_dot_dot = 1; | |
747 | return 0; | |
748 | } | |
749 | ||
750 | p->seen_other = 1; | |
751 | return 1; | |
752 | } | |
ccd979bd MF |
753 | /* |
754 | * routine to check that the specified directory is empty (for rmdir) | |
0bfbbf62 MF |
755 | * |
756 | * Returns 1 if dir is empty, zero otherwise. | |
ccd979bd MF |
757 | */ |
758 | int ocfs2_empty_dir(struct inode *inode) | |
759 | { | |
0bfbbf62 MF |
760 | int ret; |
761 | loff_t start = 0; | |
762 | struct ocfs2_empty_dir_priv priv; | |
ccd979bd | 763 | |
0bfbbf62 | 764 | memset(&priv, 0, sizeof(priv)); |
ccd979bd | 765 | |
0bfbbf62 MF |
766 | ret = ocfs2_dir_foreach(inode, &start, &priv, ocfs2_empty_dir_filldir); |
767 | if (ret) | |
768 | mlog_errno(ret); | |
769 | ||
770 | if (!priv.seen_dot || !priv.seen_dot_dot) { | |
771 | mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n", | |
b0697053 | 772 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
0bfbbf62 MF |
773 | /* |
774 | * XXX: Is it really safe to allow an unlink to continue? | |
775 | */ | |
ccd979bd MF |
776 | return 1; |
777 | } | |
0bfbbf62 MF |
778 | |
779 | return !priv.seen_other; | |
ccd979bd MF |
780 | } |
781 | ||
316f4b9f MF |
782 | int ocfs2_fill_new_dir(struct ocfs2_super *osb, |
783 | handle_t *handle, | |
784 | struct inode *parent, | |
785 | struct inode *inode, | |
786 | struct buffer_head *fe_bh, | |
787 | struct ocfs2_alloc_context *data_ac) | |
788 | { | |
789 | int status; | |
790 | struct buffer_head *new_bh = NULL; | |
791 | struct ocfs2_dir_entry *de = NULL; | |
792 | ||
793 | mlog_entry_void(); | |
794 | ||
795 | status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh, | |
796 | data_ac, NULL, &new_bh); | |
797 | if (status < 0) { | |
798 | mlog_errno(status); | |
799 | goto bail; | |
800 | } | |
801 | ||
802 | ocfs2_set_new_buffer_uptodate(inode, new_bh); | |
803 | ||
804 | status = ocfs2_journal_access(handle, inode, new_bh, | |
805 | OCFS2_JOURNAL_ACCESS_CREATE); | |
806 | if (status < 0) { | |
807 | mlog_errno(status); | |
808 | goto bail; | |
809 | } | |
810 | memset(new_bh->b_data, 0, osb->sb->s_blocksize); | |
811 | ||
812 | de = (struct ocfs2_dir_entry *) new_bh->b_data; | |
813 | de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno); | |
814 | de->name_len = 1; | |
815 | de->rec_len = | |
816 | cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len)); | |
817 | strcpy(de->name, "."); | |
818 | ocfs2_set_de_type(de, S_IFDIR); | |
819 | de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len)); | |
820 | de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno); | |
821 | de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize - | |
822 | OCFS2_DIR_REC_LEN(1)); | |
823 | de->name_len = 2; | |
824 | strcpy(de->name, ".."); | |
825 | ocfs2_set_de_type(de, S_IFDIR); | |
826 | ||
827 | status = ocfs2_journal_dirty(handle, new_bh); | |
828 | if (status < 0) { | |
829 | mlog_errno(status); | |
830 | goto bail; | |
831 | } | |
832 | ||
833 | i_size_write(inode, inode->i_sb->s_blocksize); | |
834 | inode->i_nlink = 2; | |
835 | inode->i_blocks = ocfs2_inode_sector_count(inode); | |
836 | status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); | |
837 | if (status < 0) { | |
838 | mlog_errno(status); | |
839 | goto bail; | |
840 | } | |
841 | ||
842 | status = 0; | |
843 | bail: | |
844 | if (new_bh) | |
845 | brelse(new_bh); | |
846 | ||
847 | mlog_exit(status); | |
848 | return status; | |
849 | } | |
850 | ||
ccd979bd | 851 | /* returns a bh of the 1st new block in the allocation. */ |
316f4b9f MF |
852 | static int ocfs2_do_extend_dir(struct super_block *sb, |
853 | handle_t *handle, | |
854 | struct inode *dir, | |
855 | struct buffer_head *parent_fe_bh, | |
856 | struct ocfs2_alloc_context *data_ac, | |
857 | struct ocfs2_alloc_context *meta_ac, | |
858 | struct buffer_head **new_bh) | |
ccd979bd MF |
859 | { |
860 | int status; | |
861 | int extend; | |
8110b073 | 862 | u64 p_blkno, v_blkno; |
ccd979bd MF |
863 | |
864 | spin_lock(&OCFS2_I(dir)->ip_lock); | |
865 | extend = (i_size_read(dir) == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)); | |
866 | spin_unlock(&OCFS2_I(dir)->ip_lock); | |
867 | ||
868 | if (extend) { | |
dcd0538f MF |
869 | u32 offset = OCFS2_I(dir)->ip_clusters; |
870 | ||
871 | status = ocfs2_do_extend_allocation(OCFS2_SB(sb), dir, &offset, | |
2ae99a60 | 872 | 1, 0, parent_fe_bh, handle, |
ccd979bd MF |
873 | data_ac, meta_ac, NULL); |
874 | BUG_ON(status == -EAGAIN); | |
875 | if (status < 0) { | |
876 | mlog_errno(status); | |
877 | goto bail; | |
878 | } | |
879 | } | |
880 | ||
8110b073 MF |
881 | v_blkno = ocfs2_blocks_for_bytes(sb, i_size_read(dir)); |
882 | status = ocfs2_extent_map_get_blocks(dir, v_blkno, &p_blkno, NULL, NULL); | |
ccd979bd MF |
883 | if (status < 0) { |
884 | mlog_errno(status); | |
885 | goto bail; | |
886 | } | |
887 | ||
888 | *new_bh = sb_getblk(sb, p_blkno); | |
889 | if (!*new_bh) { | |
890 | status = -EIO; | |
891 | mlog_errno(status); | |
892 | goto bail; | |
893 | } | |
894 | status = 0; | |
895 | bail: | |
896 | mlog_exit(status); | |
897 | return status; | |
898 | } | |
899 | ||
900 | /* assumes you already have a cluster lock on the directory. */ | |
901 | static int ocfs2_extend_dir(struct ocfs2_super *osb, | |
902 | struct inode *dir, | |
903 | struct buffer_head *parent_fe_bh, | |
904 | struct buffer_head **new_de_bh) | |
905 | { | |
906 | int status = 0; | |
ee19a779 | 907 | int credits, num_free_extents, drop_alloc_sem = 0; |
ccd979bd MF |
908 | loff_t dir_i_size; |
909 | struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data; | |
910 | struct ocfs2_alloc_context *data_ac = NULL; | |
911 | struct ocfs2_alloc_context *meta_ac = NULL; | |
1fabe148 | 912 | handle_t *handle = NULL; |
ccd979bd MF |
913 | struct buffer_head *new_bh = NULL; |
914 | struct ocfs2_dir_entry * de; | |
915 | struct super_block *sb = osb->sb; | |
916 | ||
917 | mlog_entry_void(); | |
918 | ||
919 | dir_i_size = i_size_read(dir); | |
b0697053 MF |
920 | mlog(0, "extending dir %llu (i_size = %lld)\n", |
921 | (unsigned long long)OCFS2_I(dir)->ip_blkno, dir_i_size); | |
ccd979bd | 922 | |
ccd979bd MF |
923 | /* dir->i_size is always block aligned. */ |
924 | spin_lock(&OCFS2_I(dir)->ip_lock); | |
925 | if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) { | |
926 | spin_unlock(&OCFS2_I(dir)->ip_lock); | |
927 | num_free_extents = ocfs2_num_free_extents(osb, dir, fe); | |
928 | if (num_free_extents < 0) { | |
929 | status = num_free_extents; | |
930 | mlog_errno(status); | |
931 | goto bail; | |
932 | } | |
933 | ||
934 | if (!num_free_extents) { | |
da5cbf2f | 935 | status = ocfs2_reserve_new_metadata(osb, fe, &meta_ac); |
ccd979bd MF |
936 | if (status < 0) { |
937 | if (status != -ENOSPC) | |
938 | mlog_errno(status); | |
939 | goto bail; | |
940 | } | |
941 | } | |
942 | ||
da5cbf2f | 943 | status = ocfs2_reserve_clusters(osb, 1, &data_ac); |
ccd979bd MF |
944 | if (status < 0) { |
945 | if (status != -ENOSPC) | |
946 | mlog_errno(status); | |
947 | goto bail; | |
948 | } | |
949 | ||
950 | credits = ocfs2_calc_extend_credits(sb, fe, 1); | |
951 | } else { | |
952 | spin_unlock(&OCFS2_I(dir)->ip_lock); | |
953 | credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS; | |
954 | } | |
955 | ||
ee19a779 JB |
956 | down_write(&OCFS2_I(dir)->ip_alloc_sem); |
957 | drop_alloc_sem = 1; | |
958 | ||
65eff9cc | 959 | handle = ocfs2_start_trans(osb, credits); |
ccd979bd MF |
960 | if (IS_ERR(handle)) { |
961 | status = PTR_ERR(handle); | |
962 | handle = NULL; | |
963 | mlog_errno(status); | |
964 | goto bail; | |
965 | } | |
966 | ||
967 | status = ocfs2_do_extend_dir(osb->sb, handle, dir, parent_fe_bh, | |
968 | data_ac, meta_ac, &new_bh); | |
969 | if (status < 0) { | |
970 | mlog_errno(status); | |
971 | goto bail; | |
972 | } | |
973 | ||
974 | ocfs2_set_new_buffer_uptodate(dir, new_bh); | |
975 | ||
976 | status = ocfs2_journal_access(handle, dir, new_bh, | |
977 | OCFS2_JOURNAL_ACCESS_CREATE); | |
978 | if (status < 0) { | |
979 | mlog_errno(status); | |
980 | goto bail; | |
981 | } | |
982 | memset(new_bh->b_data, 0, sb->s_blocksize); | |
983 | de = (struct ocfs2_dir_entry *) new_bh->b_data; | |
984 | de->inode = 0; | |
985 | de->rec_len = cpu_to_le16(sb->s_blocksize); | |
986 | status = ocfs2_journal_dirty(handle, new_bh); | |
987 | if (status < 0) { | |
988 | mlog_errno(status); | |
989 | goto bail; | |
990 | } | |
991 | ||
992 | dir_i_size += dir->i_sb->s_blocksize; | |
993 | i_size_write(dir, dir_i_size); | |
8110b073 | 994 | dir->i_blocks = ocfs2_inode_sector_count(dir); |
ccd979bd MF |
995 | status = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh); |
996 | if (status < 0) { | |
997 | mlog_errno(status); | |
998 | goto bail; | |
999 | } | |
1000 | ||
1001 | *new_de_bh = new_bh; | |
1002 | get_bh(*new_de_bh); | |
1003 | bail: | |
ee19a779 JB |
1004 | if (drop_alloc_sem) |
1005 | up_write(&OCFS2_I(dir)->ip_alloc_sem); | |
ccd979bd | 1006 | if (handle) |
02dc1af4 | 1007 | ocfs2_commit_trans(osb, handle); |
ccd979bd MF |
1008 | |
1009 | if (data_ac) | |
1010 | ocfs2_free_alloc_context(data_ac); | |
1011 | if (meta_ac) | |
1012 | ocfs2_free_alloc_context(meta_ac); | |
1013 | ||
1014 | if (new_bh) | |
1015 | brelse(new_bh); | |
1016 | ||
1017 | mlog_exit(status); | |
1018 | return status; | |
1019 | } | |
1020 | ||
1021 | /* | |
1022 | * Search the dir for a good spot, extending it if necessary. The | |
1023 | * block containing an appropriate record is returned in ret_de_bh. | |
1024 | */ | |
1025 | int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb, | |
1026 | struct inode *dir, | |
1027 | struct buffer_head *parent_fe_bh, | |
1028 | const char *name, | |
1029 | int namelen, | |
1030 | struct buffer_head **ret_de_bh) | |
1031 | { | |
1032 | unsigned long offset; | |
1033 | struct buffer_head * bh = NULL; | |
1034 | unsigned short rec_len; | |
1035 | struct ocfs2_dinode *fe; | |
1036 | struct ocfs2_dir_entry *de; | |
1037 | struct super_block *sb; | |
1038 | int status; | |
1039 | ||
1040 | mlog_entry_void(); | |
1041 | ||
b0697053 MF |
1042 | mlog(0, "getting ready to insert namelen %d into dir %llu\n", |
1043 | namelen, (unsigned long long)OCFS2_I(dir)->ip_blkno); | |
ccd979bd MF |
1044 | |
1045 | BUG_ON(!S_ISDIR(dir->i_mode)); | |
1046 | fe = (struct ocfs2_dinode *) parent_fe_bh->b_data; | |
1047 | BUG_ON(le64_to_cpu(fe->i_size) != i_size_read(dir)); | |
1048 | ||
1049 | sb = dir->i_sb; | |
1050 | ||
1051 | if (!namelen) { | |
1052 | status = -EINVAL; | |
1053 | mlog_errno(status); | |
1054 | goto bail; | |
1055 | } | |
1056 | ||
1057 | bh = ocfs2_bread(dir, 0, &status, 0); | |
1058 | if (!bh) { | |
1059 | mlog_errno(status); | |
1060 | goto bail; | |
1061 | } | |
1062 | ||
1063 | rec_len = OCFS2_DIR_REC_LEN(namelen); | |
1064 | offset = 0; | |
1065 | de = (struct ocfs2_dir_entry *) bh->b_data; | |
1066 | while (1) { | |
1067 | if ((char *)de >= sb->s_blocksize + bh->b_data) { | |
1068 | brelse(bh); | |
1069 | bh = NULL; | |
1070 | ||
1071 | if (i_size_read(dir) <= offset) { | |
1072 | status = ocfs2_extend_dir(osb, | |
1073 | dir, | |
1074 | parent_fe_bh, | |
1075 | &bh); | |
1076 | if (status < 0) { | |
1077 | mlog_errno(status); | |
1078 | goto bail; | |
1079 | } | |
1080 | BUG_ON(!bh); | |
1081 | *ret_de_bh = bh; | |
1082 | get_bh(*ret_de_bh); | |
1083 | goto bail; | |
1084 | } | |
1085 | bh = ocfs2_bread(dir, | |
1086 | offset >> sb->s_blocksize_bits, | |
1087 | &status, | |
1088 | 0); | |
1089 | if (!bh) { | |
1090 | mlog_errno(status); | |
1091 | goto bail; | |
1092 | } | |
1093 | /* move to next block */ | |
1094 | de = (struct ocfs2_dir_entry *) bh->b_data; | |
1095 | } | |
1096 | if (!ocfs2_check_dir_entry(dir, de, bh, offset)) { | |
1097 | status = -ENOENT; | |
1098 | goto bail; | |
1099 | } | |
1100 | if (ocfs2_match(namelen, name, de)) { | |
1101 | status = -EEXIST; | |
1102 | goto bail; | |
1103 | } | |
8553cf4f | 1104 | if (ocfs2_dirent_would_fit(de, rec_len)) { |
ccd979bd MF |
1105 | /* Ok, we found a spot. Return this bh and let |
1106 | * the caller actually fill it in. */ | |
1107 | *ret_de_bh = bh; | |
1108 | get_bh(*ret_de_bh); | |
1109 | status = 0; | |
1110 | goto bail; | |
1111 | } | |
1112 | offset += le16_to_cpu(de->rec_len); | |
1113 | de = (struct ocfs2_dir_entry *)((char *) de + le16_to_cpu(de->rec_len)); | |
1114 | } | |
1115 | ||
1116 | status = 0; | |
1117 | bail: | |
1118 | if (bh) | |
1119 | brelse(bh); | |
1120 | ||
1121 | mlog_exit(status); | |
1122 | return status; | |
1123 | } |