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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/ufs/ufs_dir.c | |
3 | * | |
4 | * Copyright (C) 1996 | |
5 | * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu) | |
6 | * Laboratory for Computer Science Research Computing Facility | |
7 | * Rutgers, The State University of New Jersey | |
8 | * | |
9 | * swab support by Francois-Rene Rideau <fare@tunes.org> 19970406 | |
10 | * | |
11 | * 4.4BSD (FreeBSD) support added on February 1st 1998 by | |
12 | * Niels Kristian Bech Jensen <nkbj@image.dk> partially based | |
13 | * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>. | |
b71034e5 ED |
14 | * |
15 | * Migration to usage of "page cache" on May 2006 by | |
16 | * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base. | |
1da177e4 LT |
17 | */ |
18 | ||
19 | #include <linux/time.h> | |
20 | #include <linux/fs.h> | |
82b9d1d0 | 21 | #include <linux/swap.h> |
1da177e4 | 22 | |
e5420598 | 23 | #include "ufs_fs.h" |
bcd6d4ec | 24 | #include "ufs.h" |
1da177e4 LT |
25 | #include "swab.h" |
26 | #include "util.h" | |
27 | ||
1da177e4 LT |
28 | /* |
29 | * NOTE! unlike strncmp, ufs_match returns 1 for success, 0 for failure. | |
30 | * | |
31 | * len <= UFS_MAXNAMLEN and de != NULL are guaranteed by caller. | |
32 | */ | |
33 | static inline int ufs_match(struct super_block *sb, int len, | |
89031bc7 | 34 | const unsigned char *name, struct ufs_dir_entry *de) |
1da177e4 LT |
35 | { |
36 | if (len != ufs_get_de_namlen(sb, de)) | |
37 | return 0; | |
38 | if (!de->d_ino) | |
39 | return 0; | |
40 | return !memcmp(name, de->d_name, len); | |
41 | } | |
42 | ||
82b9d1d0 | 43 | static int ufs_commit_chunk(struct page *page, loff_t pos, unsigned len) |
1da177e4 | 44 | { |
82b9d1d0 NP |
45 | struct address_space *mapping = page->mapping; |
46 | struct inode *dir = mapping->host; | |
b71034e5 | 47 | int err = 0; |
82b9d1d0 | 48 | |
b71034e5 | 49 | dir->i_version++; |
82b9d1d0 NP |
50 | block_write_end(NULL, mapping, pos, len, len, page, NULL); |
51 | if (pos+len > dir->i_size) { | |
52 | i_size_write(dir, pos+len); | |
53 | mark_inode_dirty(dir); | |
54 | } | |
b71034e5 ED |
55 | if (IS_DIRSYNC(dir)) |
56 | err = write_one_page(page, 1); | |
57 | else | |
58 | unlock_page(page); | |
59 | return err; | |
60 | } | |
1da177e4 | 61 | |
b71034e5 ED |
62 | static inline void ufs_put_page(struct page *page) |
63 | { | |
64 | kunmap(page); | |
65 | page_cache_release(page); | |
66 | } | |
1da177e4 | 67 | |
b71034e5 ED |
68 | static inline unsigned long ufs_dir_pages(struct inode *inode) |
69 | { | |
70 | return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT; | |
71 | } | |
1da177e4 | 72 | |
89031bc7 | 73 | ino_t ufs_inode_by_name(struct inode *dir, const struct qstr *qstr) |
b71034e5 ED |
74 | { |
75 | ino_t res = 0; | |
76 | struct ufs_dir_entry *de; | |
77 | struct page *page; | |
78 | ||
08049707 | 79 | de = ufs_find_entry(dir, qstr, &page); |
b71034e5 ED |
80 | if (de) { |
81 | res = fs32_to_cpu(dir->i_sb, de->d_ino); | |
82 | ufs_put_page(page); | |
1da177e4 | 83 | } |
b71034e5 | 84 | return res; |
1da177e4 LT |
85 | } |
86 | ||
1da177e4 | 87 | |
b71034e5 ED |
88 | /* Releases the page */ |
89 | void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de, | |
70d45cdb AV |
90 | struct page *page, struct inode *inode, |
91 | bool update_times) | |
1da177e4 | 92 | { |
82b9d1d0 NP |
93 | loff_t pos = page_offset(page) + |
94 | (char *) de - (char *) page_address(page); | |
95 | unsigned len = fs16_to_cpu(dir->i_sb, de->d_reclen); | |
b71034e5 | 96 | int err; |
1da177e4 | 97 | |
b71034e5 | 98 | lock_page(page); |
f4e420dc | 99 | err = ufs_prepare_chunk(page, pos, len); |
b71034e5 | 100 | BUG_ON(err); |
82b9d1d0 | 101 | |
b71034e5 ED |
102 | de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino); |
103 | ufs_set_de_type(dir->i_sb, de, inode->i_mode); | |
82b9d1d0 NP |
104 | |
105 | err = ufs_commit_chunk(page, pos, len); | |
b71034e5 | 106 | ufs_put_page(page); |
70d45cdb AV |
107 | if (update_times) |
108 | dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; | |
b71034e5 ED |
109 | mark_inode_dirty(dir); |
110 | } | |
1da177e4 | 111 | |
1da177e4 | 112 | |
b71034e5 ED |
113 | static void ufs_check_page(struct page *page) |
114 | { | |
115 | struct inode *dir = page->mapping->host; | |
116 | struct super_block *sb = dir->i_sb; | |
117 | char *kaddr = page_address(page); | |
118 | unsigned offs, rec_len; | |
119 | unsigned limit = PAGE_CACHE_SIZE; | |
f336953b | 120 | const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1; |
b71034e5 ED |
121 | struct ufs_dir_entry *p; |
122 | char *error; | |
123 | ||
124 | if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) { | |
125 | limit = dir->i_size & ~PAGE_CACHE_MASK; | |
f336953b | 126 | if (limit & chunk_mask) |
b71034e5 ED |
127 | goto Ebadsize; |
128 | if (!limit) | |
129 | goto out; | |
1da177e4 | 130 | } |
b71034e5 ED |
131 | for (offs = 0; offs <= limit - UFS_DIR_REC_LEN(1); offs += rec_len) { |
132 | p = (struct ufs_dir_entry *)(kaddr + offs); | |
133 | rec_len = fs16_to_cpu(sb, p->d_reclen); | |
134 | ||
135 | if (rec_len < UFS_DIR_REC_LEN(1)) | |
136 | goto Eshort; | |
137 | if (rec_len & 3) | |
138 | goto Ealign; | |
139 | if (rec_len < UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, p))) | |
140 | goto Enamelen; | |
f336953b | 141 | if (((offs + rec_len - 1) ^ offs) & ~chunk_mask) |
b71034e5 ED |
142 | goto Espan; |
143 | if (fs32_to_cpu(sb, p->d_ino) > (UFS_SB(sb)->s_uspi->s_ipg * | |
144 | UFS_SB(sb)->s_uspi->s_ncg)) | |
145 | goto Einumber; | |
146 | } | |
147 | if (offs != limit) | |
148 | goto Eend; | |
149 | out: | |
150 | SetPageChecked(page); | |
151 | return; | |
152 | ||
153 | /* Too bad, we had an error */ | |
154 | ||
155 | Ebadsize: | |
156 | ufs_error(sb, "ufs_check_page", | |
157 | "size of directory #%lu is not a multiple of chunk size", | |
158 | dir->i_ino | |
159 | ); | |
160 | goto fail; | |
161 | Eshort: | |
162 | error = "rec_len is smaller than minimal"; | |
163 | goto bad_entry; | |
164 | Ealign: | |
165 | error = "unaligned directory entry"; | |
166 | goto bad_entry; | |
167 | Enamelen: | |
168 | error = "rec_len is too small for name_len"; | |
169 | goto bad_entry; | |
170 | Espan: | |
171 | error = "directory entry across blocks"; | |
172 | goto bad_entry; | |
173 | Einumber: | |
174 | error = "inode out of bounds"; | |
175 | bad_entry: | |
176 | ufs_error (sb, "ufs_check_page", "bad entry in directory #%lu: %s - " | |
177 | "offset=%lu, rec_len=%d, name_len=%d", | |
178 | dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs, | |
179 | rec_len, ufs_get_de_namlen(sb, p)); | |
180 | goto fail; | |
181 | Eend: | |
182 | p = (struct ufs_dir_entry *)(kaddr + offs); | |
9746077a | 183 | ufs_error(sb, __func__, |
b71034e5 ED |
184 | "entry in directory #%lu spans the page boundary" |
185 | "offset=%lu", | |
186 | dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs); | |
187 | fail: | |
188 | SetPageChecked(page); | |
189 | SetPageError(page); | |
190 | } | |
1da177e4 | 191 | |
b71034e5 ED |
192 | static struct page *ufs_get_page(struct inode *dir, unsigned long n) |
193 | { | |
194 | struct address_space *mapping = dir->i_mapping; | |
6fe6900e | 195 | struct page *page = read_mapping_page(mapping, n, NULL); |
b71034e5 | 196 | if (!IS_ERR(page)) { |
b71034e5 | 197 | kmap(page); |
b71034e5 ED |
198 | if (!PageChecked(page)) |
199 | ufs_check_page(page); | |
200 | if (PageError(page)) | |
201 | goto fail; | |
1da177e4 | 202 | } |
b71034e5 | 203 | return page; |
1da177e4 | 204 | |
b71034e5 ED |
205 | fail: |
206 | ufs_put_page(page); | |
207 | return ERR_PTR(-EIO); | |
1da177e4 LT |
208 | } |
209 | ||
b71034e5 ED |
210 | /* |
211 | * Return the offset into page `page_nr' of the last valid | |
212 | * byte in that page, plus one. | |
213 | */ | |
214 | static unsigned | |
215 | ufs_last_byte(struct inode *inode, unsigned long page_nr) | |
1da177e4 | 216 | { |
b71034e5 ED |
217 | unsigned last_byte = inode->i_size; |
218 | ||
219 | last_byte -= page_nr << PAGE_CACHE_SHIFT; | |
220 | if (last_byte > PAGE_CACHE_SIZE) | |
221 | last_byte = PAGE_CACHE_SIZE; | |
222 | return last_byte; | |
1da177e4 LT |
223 | } |
224 | ||
b71034e5 ED |
225 | static inline struct ufs_dir_entry * |
226 | ufs_next_entry(struct super_block *sb, struct ufs_dir_entry *p) | |
1da177e4 | 227 | { |
b71034e5 ED |
228 | return (struct ufs_dir_entry *)((char *)p + |
229 | fs16_to_cpu(sb, p->d_reclen)); | |
1da177e4 | 230 | } |
b71034e5 ED |
231 | |
232 | struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p) | |
1da177e4 | 233 | { |
b71034e5 ED |
234 | struct page *page = ufs_get_page(dir, 0); |
235 | struct ufs_dir_entry *de = NULL; | |
1da177e4 | 236 | |
b71034e5 ED |
237 | if (!IS_ERR(page)) { |
238 | de = ufs_next_entry(dir->i_sb, | |
239 | (struct ufs_dir_entry *)page_address(page)); | |
240 | *p = page; | |
1da177e4 | 241 | } |
b71034e5 | 242 | return de; |
1da177e4 LT |
243 | } |
244 | ||
b71034e5 ED |
245 | /* |
246 | * ufs_find_entry() | |
247 | * | |
248 | * finds an entry in the specified directory with the wanted name. It | |
249 | * returns the page in which the entry was found, and the entry itself | |
250 | * (as a parameter - res_dir). Page is returned mapped and unlocked. | |
251 | * Entry is guaranteed to be valid. | |
252 | */ | |
89031bc7 | 253 | struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr, |
b71034e5 | 254 | struct page **res_page) |
1da177e4 | 255 | { |
b71034e5 | 256 | struct super_block *sb = dir->i_sb; |
89031bc7 | 257 | const unsigned char *name = qstr->name; |
08049707 | 258 | int namelen = qstr->len; |
b71034e5 ED |
259 | unsigned reclen = UFS_DIR_REC_LEN(namelen); |
260 | unsigned long start, n; | |
261 | unsigned long npages = ufs_dir_pages(dir); | |
262 | struct page *page = NULL; | |
dd187a26 | 263 | struct ufs_inode_info *ui = UFS_I(dir); |
b71034e5 ED |
264 | struct ufs_dir_entry *de; |
265 | ||
abf5d15f | 266 | UFSD("ENTER, dir_ino %lu, name %s, namlen %u\n", dir->i_ino, name, namelen); |
b71034e5 ED |
267 | |
268 | if (npages == 0 || namelen > UFS_MAXNAMLEN) | |
269 | goto out; | |
270 | ||
271 | /* OFFSET_CACHE */ | |
272 | *res_page = NULL; | |
273 | ||
dd187a26 ED |
274 | start = ui->i_dir_start_lookup; |
275 | ||
b71034e5 ED |
276 | if (start >= npages) |
277 | start = 0; | |
278 | n = start; | |
279 | do { | |
280 | char *kaddr; | |
281 | page = ufs_get_page(dir, n); | |
282 | if (!IS_ERR(page)) { | |
283 | kaddr = page_address(page); | |
284 | de = (struct ufs_dir_entry *) kaddr; | |
285 | kaddr += ufs_last_byte(dir, n) - reclen; | |
286 | while ((char *) de <= kaddr) { | |
287 | if (de->d_reclen == 0) { | |
9746077a | 288 | ufs_error(dir->i_sb, __func__, |
b71034e5 ED |
289 | "zero-length directory entry"); |
290 | ufs_put_page(page); | |
291 | goto out; | |
292 | } | |
293 | if (ufs_match(sb, namelen, name, de)) | |
294 | goto found; | |
295 | de = ufs_next_entry(sb, de); | |
296 | } | |
297 | ufs_put_page(page); | |
298 | } | |
299 | if (++n >= npages) | |
300 | n = 0; | |
301 | } while (n != start); | |
302 | out: | |
303 | return NULL; | |
304 | ||
305 | found: | |
306 | *res_page = page; | |
dd187a26 | 307 | ui->i_dir_start_lookup = n; |
b71034e5 | 308 | return de; |
1da177e4 LT |
309 | } |
310 | ||
311 | /* | |
b71034e5 | 312 | * Parent is locked. |
1da177e4 LT |
313 | */ |
314 | int ufs_add_link(struct dentry *dentry, struct inode *inode) | |
315 | { | |
2b0143b5 | 316 | struct inode *dir = d_inode(dentry->d_parent); |
89031bc7 | 317 | const unsigned char *name = dentry->d_name.name; |
1da177e4 | 318 | int namelen = dentry->d_name.len; |
b71034e5 ED |
319 | struct super_block *sb = dir->i_sb; |
320 | unsigned reclen = UFS_DIR_REC_LEN(namelen); | |
f336953b | 321 | const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize; |
b71034e5 ED |
322 | unsigned short rec_len, name_len; |
323 | struct page *page = NULL; | |
324 | struct ufs_dir_entry *de; | |
325 | unsigned long npages = ufs_dir_pages(dir); | |
326 | unsigned long n; | |
327 | char *kaddr; | |
82b9d1d0 | 328 | loff_t pos; |
1da177e4 LT |
329 | int err; |
330 | ||
abf5d15f | 331 | UFSD("ENTER, name %s, namelen %u\n", name, namelen); |
b71034e5 ED |
332 | |
333 | /* | |
334 | * We take care of directory expansion in the same loop. | |
335 | * This code plays outside i_size, so it locks the page | |
336 | * to protect that region. | |
337 | */ | |
338 | for (n = 0; n <= npages; n++) { | |
339 | char *dir_end; | |
340 | ||
341 | page = ufs_get_page(dir, n); | |
342 | err = PTR_ERR(page); | |
343 | if (IS_ERR(page)) | |
344 | goto out; | |
345 | lock_page(page); | |
346 | kaddr = page_address(page); | |
347 | dir_end = kaddr + ufs_last_byte(dir, n); | |
348 | de = (struct ufs_dir_entry *)kaddr; | |
349 | kaddr += PAGE_CACHE_SIZE - reclen; | |
350 | while ((char *)de <= kaddr) { | |
351 | if ((char *)de == dir_end) { | |
352 | /* We hit i_size */ | |
353 | name_len = 0; | |
f336953b ED |
354 | rec_len = chunk_size; |
355 | de->d_reclen = cpu_to_fs16(sb, chunk_size); | |
b71034e5 ED |
356 | de->d_ino = 0; |
357 | goto got_it; | |
1da177e4 | 358 | } |
b71034e5 | 359 | if (de->d_reclen == 0) { |
9746077a | 360 | ufs_error(dir->i_sb, __func__, |
b71034e5 ED |
361 | "zero-length directory entry"); |
362 | err = -EIO; | |
363 | goto out_unlock; | |
364 | } | |
365 | err = -EEXIST; | |
366 | if (ufs_match(sb, namelen, name, de)) | |
367 | goto out_unlock; | |
368 | name_len = UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de)); | |
369 | rec_len = fs16_to_cpu(sb, de->d_reclen); | |
370 | if (!de->d_ino && rec_len >= reclen) | |
371 | goto got_it; | |
372 | if (rec_len >= name_len + reclen) | |
373 | goto got_it; | |
374 | de = (struct ufs_dir_entry *) ((char *) de + rec_len); | |
1da177e4 | 375 | } |
b71034e5 ED |
376 | unlock_page(page); |
377 | ufs_put_page(page); | |
1da177e4 | 378 | } |
b71034e5 ED |
379 | BUG(); |
380 | return -EINVAL; | |
381 | ||
382 | got_it: | |
82b9d1d0 NP |
383 | pos = page_offset(page) + |
384 | (char*)de - (char*)page_address(page); | |
f4e420dc | 385 | err = ufs_prepare_chunk(page, pos, rec_len); |
b71034e5 ED |
386 | if (err) |
387 | goto out_unlock; | |
1da177e4 | 388 | if (de->d_ino) { |
b71034e5 ED |
389 | struct ufs_dir_entry *de1 = |
390 | (struct ufs_dir_entry *) ((char *) de + name_len); | |
391 | de1->d_reclen = cpu_to_fs16(sb, rec_len - name_len); | |
392 | de->d_reclen = cpu_to_fs16(sb, name_len); | |
393 | ||
1da177e4 LT |
394 | de = de1; |
395 | } | |
b71034e5 | 396 | |
1da177e4 | 397 | ufs_set_de_namlen(sb, de, namelen); |
b71034e5 | 398 | memcpy(de->d_name, name, namelen + 1); |
1da177e4 LT |
399 | de->d_ino = cpu_to_fs32(sb, inode->i_ino); |
400 | ufs_set_de_type(sb, de, inode->i_mode); | |
b71034e5 | 401 | |
82b9d1d0 | 402 | err = ufs_commit_chunk(page, pos, rec_len); |
1da177e4 | 403 | dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; |
b71034e5 | 404 | |
1da177e4 | 405 | mark_inode_dirty(dir); |
b71034e5 ED |
406 | /* OFFSET_CACHE */ |
407 | out_put: | |
408 | ufs_put_page(page); | |
409 | out: | |
410 | return err; | |
411 | out_unlock: | |
412 | unlock_page(page); | |
413 | goto out_put; | |
414 | } | |
415 | ||
416 | static inline unsigned | |
417 | ufs_validate_entry(struct super_block *sb, char *base, | |
418 | unsigned offset, unsigned mask) | |
419 | { | |
420 | struct ufs_dir_entry *de = (struct ufs_dir_entry*)(base + offset); | |
421 | struct ufs_dir_entry *p = (struct ufs_dir_entry*)(base + (offset&mask)); | |
422 | while ((char*)p < (char*)de) { | |
423 | if (p->d_reclen == 0) | |
424 | break; | |
425 | p = ufs_next_entry(sb, p); | |
426 | } | |
427 | return (char *)p - base; | |
428 | } | |
1da177e4 | 429 | |
b71034e5 ED |
430 | |
431 | /* | |
432 | * This is blatantly stolen from ext2fs | |
433 | */ | |
434 | static int | |
80886298 | 435 | ufs_readdir(struct file *file, struct dir_context *ctx) |
b71034e5 | 436 | { |
80886298 AV |
437 | loff_t pos = ctx->pos; |
438 | struct inode *inode = file_inode(file); | |
b71034e5 ED |
439 | struct super_block *sb = inode->i_sb; |
440 | unsigned int offset = pos & ~PAGE_CACHE_MASK; | |
441 | unsigned long n = pos >> PAGE_CACHE_SHIFT; | |
442 | unsigned long npages = ufs_dir_pages(inode); | |
f336953b | 443 | unsigned chunk_mask = ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1); |
80886298 | 444 | int need_revalidate = file->f_version != inode->i_version; |
b71034e5 ED |
445 | unsigned flags = UFS_SB(sb)->s_flags; |
446 | ||
abf5d15f | 447 | UFSD("BEGIN\n"); |
b71034e5 ED |
448 | |
449 | if (pos > inode->i_size - UFS_DIR_REC_LEN(1)) | |
450 | return 0; | |
451 | ||
452 | for ( ; n < npages; n++, offset = 0) { | |
453 | char *kaddr, *limit; | |
454 | struct ufs_dir_entry *de; | |
455 | ||
456 | struct page *page = ufs_get_page(inode, n); | |
457 | ||
458 | if (IS_ERR(page)) { | |
9746077a | 459 | ufs_error(sb, __func__, |
b71034e5 ED |
460 | "bad page in #%lu", |
461 | inode->i_ino); | |
80886298 | 462 | ctx->pos += PAGE_CACHE_SIZE - offset; |
b71034e5 ED |
463 | return -EIO; |
464 | } | |
465 | kaddr = page_address(page); | |
466 | if (unlikely(need_revalidate)) { | |
467 | if (offset) { | |
468 | offset = ufs_validate_entry(sb, kaddr, offset, chunk_mask); | |
80886298 | 469 | ctx->pos = (n<<PAGE_CACHE_SHIFT) + offset; |
b71034e5 | 470 | } |
80886298 | 471 | file->f_version = inode->i_version; |
b71034e5 ED |
472 | need_revalidate = 0; |
473 | } | |
474 | de = (struct ufs_dir_entry *)(kaddr+offset); | |
475 | limit = kaddr + ufs_last_byte(inode, n) - UFS_DIR_REC_LEN(1); | |
476 | for ( ;(char*)de <= limit; de = ufs_next_entry(sb, de)) { | |
477 | if (de->d_reclen == 0) { | |
9746077a | 478 | ufs_error(sb, __func__, |
b71034e5 ED |
479 | "zero-length directory entry"); |
480 | ufs_put_page(page); | |
481 | return -EIO; | |
482 | } | |
483 | if (de->d_ino) { | |
b71034e5 ED |
484 | unsigned char d_type = DT_UNKNOWN; |
485 | ||
abf5d15f ED |
486 | UFSD("filldir(%s,%u)\n", de->d_name, |
487 | fs32_to_cpu(sb, de->d_ino)); | |
488 | UFSD("namlen %u\n", ufs_get_de_namlen(sb, de)); | |
b71034e5 ED |
489 | |
490 | if ((flags & UFS_DE_MASK) == UFS_DE_44BSD) | |
491 | d_type = de->d_u.d_44.d_type; | |
492 | ||
80886298 | 493 | if (!dir_emit(ctx, de->d_name, |
b71034e5 | 494 | ufs_get_de_namlen(sb, de), |
80886298 AV |
495 | fs32_to_cpu(sb, de->d_ino), |
496 | d_type)) { | |
b71034e5 ED |
497 | ufs_put_page(page); |
498 | return 0; | |
499 | } | |
500 | } | |
80886298 | 501 | ctx->pos += fs16_to_cpu(sb, de->d_reclen); |
b71034e5 ED |
502 | } |
503 | ufs_put_page(page); | |
504 | } | |
1da177e4 LT |
505 | return 0; |
506 | } | |
507 | ||
b71034e5 | 508 | |
1da177e4 LT |
509 | /* |
510 | * ufs_delete_entry deletes a directory entry by merging it with the | |
511 | * previous entry. | |
512 | */ | |
b71034e5 ED |
513 | int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir, |
514 | struct page * page) | |
1da177e4 | 515 | { |
b71034e5 | 516 | struct super_block *sb = inode->i_sb; |
b71034e5 | 517 | char *kaddr = page_address(page); |
f336953b | 518 | unsigned from = ((char*)dir - kaddr) & ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1); |
b71034e5 | 519 | unsigned to = ((char*)dir - kaddr) + fs16_to_cpu(sb, dir->d_reclen); |
82b9d1d0 | 520 | loff_t pos; |
b71034e5 ED |
521 | struct ufs_dir_entry *pde = NULL; |
522 | struct ufs_dir_entry *de = (struct ufs_dir_entry *) (kaddr + from); | |
523 | int err; | |
1da177e4 | 524 | |
abf5d15f | 525 | UFSD("ENTER\n"); |
1da177e4 | 526 | |
abf5d15f | 527 | UFSD("ino %u, reclen %u, namlen %u, name %s\n", |
b71034e5 ED |
528 | fs32_to_cpu(sb, de->d_ino), |
529 | fs16_to_cpu(sb, de->d_reclen), | |
abf5d15f | 530 | ufs_get_de_namlen(sb, de), de->d_name); |
b71034e5 ED |
531 | |
532 | while ((char*)de < (char*)dir) { | |
533 | if (de->d_reclen == 0) { | |
9746077a | 534 | ufs_error(inode->i_sb, __func__, |
b71034e5 ED |
535 | "zero-length directory entry"); |
536 | err = -EIO; | |
537 | goto out; | |
1da177e4 | 538 | } |
b71034e5 ED |
539 | pde = de; |
540 | de = ufs_next_entry(sb, de); | |
1da177e4 | 541 | } |
b71034e5 ED |
542 | if (pde) |
543 | from = (char*)pde - (char*)page_address(page); | |
82b9d1d0 NP |
544 | |
545 | pos = page_offset(page) + from; | |
b71034e5 | 546 | lock_page(page); |
f4e420dc | 547 | err = ufs_prepare_chunk(page, pos, to - from); |
b71034e5 ED |
548 | BUG_ON(err); |
549 | if (pde) | |
82b9d1d0 | 550 | pde->d_reclen = cpu_to_fs16(sb, to - from); |
b71034e5 | 551 | dir->d_ino = 0; |
82b9d1d0 | 552 | err = ufs_commit_chunk(page, pos, to - from); |
b71034e5 ED |
553 | inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; |
554 | mark_inode_dirty(inode); | |
555 | out: | |
556 | ufs_put_page(page); | |
abf5d15f | 557 | UFSD("EXIT\n"); |
b71034e5 | 558 | return err; |
1da177e4 LT |
559 | } |
560 | ||
561 | int ufs_make_empty(struct inode * inode, struct inode *dir) | |
562 | { | |
563 | struct super_block * sb = dir->i_sb; | |
b71034e5 ED |
564 | struct address_space *mapping = inode->i_mapping; |
565 | struct page *page = grab_cache_page(mapping, 0); | |
f336953b | 566 | const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize; |
1da177e4 | 567 | struct ufs_dir_entry * de; |
b71034e5 | 568 | char *base; |
1da177e4 LT |
569 | int err; |
570 | ||
b71034e5 ED |
571 | if (!page) |
572 | return -ENOMEM; | |
82b9d1d0 | 573 | |
f4e420dc | 574 | err = ufs_prepare_chunk(page, 0, chunk_size); |
b71034e5 ED |
575 | if (err) { |
576 | unlock_page(page); | |
577 | goto fail; | |
578 | } | |
579 | ||
82b9d1d0 | 580 | kmap(page); |
b71034e5 ED |
581 | base = (char*)page_address(page); |
582 | memset(base, 0, PAGE_CACHE_SIZE); | |
583 | ||
584 | de = (struct ufs_dir_entry *) base; | |
1da177e4 | 585 | |
1da177e4 LT |
586 | de->d_ino = cpu_to_fs32(sb, inode->i_ino); |
587 | ufs_set_de_type(sb, de, inode->i_mode); | |
588 | ufs_set_de_namlen(sb, de, 1); | |
589 | de->d_reclen = cpu_to_fs16(sb, UFS_DIR_REC_LEN(1)); | |
590 | strcpy (de->d_name, "."); | |
591 | de = (struct ufs_dir_entry *) | |
592 | ((char *)de + fs16_to_cpu(sb, de->d_reclen)); | |
593 | de->d_ino = cpu_to_fs32(sb, dir->i_ino); | |
594 | ufs_set_de_type(sb, de, dir->i_mode); | |
f336953b | 595 | de->d_reclen = cpu_to_fs16(sb, chunk_size - UFS_DIR_REC_LEN(1)); |
1da177e4 LT |
596 | ufs_set_de_namlen(sb, de, 2); |
597 | strcpy (de->d_name, ".."); | |
82b9d1d0 | 598 | kunmap(page); |
b71034e5 | 599 | |
f336953b | 600 | err = ufs_commit_chunk(page, 0, chunk_size); |
b71034e5 | 601 | fail: |
b71034e5 ED |
602 | page_cache_release(page); |
603 | return err; | |
1da177e4 LT |
604 | } |
605 | ||
606 | /* | |
607 | * routine to check that the specified directory is empty (for rmdir) | |
608 | */ | |
b71034e5 | 609 | int ufs_empty_dir(struct inode * inode) |
1da177e4 | 610 | { |
b71034e5 ED |
611 | struct super_block *sb = inode->i_sb; |
612 | struct page *page = NULL; | |
613 | unsigned long i, npages = ufs_dir_pages(inode); | |
614 | ||
615 | for (i = 0; i < npages; i++) { | |
616 | char *kaddr; | |
617 | struct ufs_dir_entry *de; | |
618 | page = ufs_get_page(inode, i); | |
619 | ||
620 | if (IS_ERR(page)) | |
621 | continue; | |
622 | ||
623 | kaddr = page_address(page); | |
624 | de = (struct ufs_dir_entry *)kaddr; | |
625 | kaddr += ufs_last_byte(inode, i) - UFS_DIR_REC_LEN(1); | |
626 | ||
627 | while ((char *)de <= kaddr) { | |
628 | if (de->d_reclen == 0) { | |
9746077a | 629 | ufs_error(inode->i_sb, __func__, |
b71034e5 ED |
630 | "zero-length directory entry: " |
631 | "kaddr=%p, de=%p\n", kaddr, de); | |
632 | goto not_empty; | |
1da177e4 | 633 | } |
b71034e5 ED |
634 | if (de->d_ino) { |
635 | u16 namelen=ufs_get_de_namlen(sb, de); | |
636 | /* check for . and .. */ | |
637 | if (de->d_name[0] != '.') | |
638 | goto not_empty; | |
639 | if (namelen > 2) | |
640 | goto not_empty; | |
641 | if (namelen < 2) { | |
642 | if (inode->i_ino != | |
643 | fs32_to_cpu(sb, de->d_ino)) | |
644 | goto not_empty; | |
645 | } else if (de->d_name[1] != '.') | |
646 | goto not_empty; | |
647 | } | |
648 | de = ufs_next_entry(sb, de); | |
1da177e4 | 649 | } |
b71034e5 | 650 | ufs_put_page(page); |
1da177e4 | 651 | } |
1da177e4 | 652 | return 1; |
b71034e5 ED |
653 | |
654 | not_empty: | |
655 | ufs_put_page(page); | |
656 | return 0; | |
1da177e4 LT |
657 | } |
658 | ||
4b6f5d20 | 659 | const struct file_operations ufs_dir_operations = { |
1da177e4 | 660 | .read = generic_read_dir, |
80886298 | 661 | .iterate = ufs_readdir, |
1b061d92 | 662 | .fsync = generic_file_fsync, |
3222a3e5 | 663 | .llseek = generic_file_llseek, |
1da177e4 | 664 | }; |