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