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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/affs/namei.c | |
3 | * | |
4 | * (c) 1996 Hans-Joachim Widmaier - Rewritten | |
5 | * | |
6 | * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. | |
7 | * | |
8 | * (C) 1991 Linus Torvalds - minix filesystem | |
9 | */ | |
10 | ||
11 | #include "affs.h" | |
12 | ||
13 | typedef int (*toupper_t)(int); | |
14 | ||
15 | static int affs_toupper(int ch); | |
da53be12 LT |
16 | static int affs_hash_dentry(const struct dentry *, struct qstr *); |
17 | static int affs_compare_dentry(const struct dentry *parent, const struct dentry *dentry, | |
621e155a | 18 | unsigned int len, const char *str, const struct qstr *name); |
1da177e4 | 19 | static int affs_intl_toupper(int ch); |
da53be12 LT |
20 | static int affs_intl_hash_dentry(const struct dentry *, struct qstr *); |
21 | static int affs_intl_compare_dentry(const struct dentry *parent, const struct dentry *dentry, | |
621e155a | 22 | unsigned int len, const char *str, const struct qstr *name); |
1da177e4 | 23 | |
e16404ed | 24 | const struct dentry_operations affs_dentry_operations = { |
1da177e4 LT |
25 | .d_hash = affs_hash_dentry, |
26 | .d_compare = affs_compare_dentry, | |
27 | }; | |
28 | ||
a129880d | 29 | const struct dentry_operations affs_intl_dentry_operations = { |
1da177e4 LT |
30 | .d_hash = affs_intl_hash_dentry, |
31 | .d_compare = affs_intl_compare_dentry, | |
32 | }; | |
33 | ||
34 | ||
35 | /* Simple toupper() for DOS\1 */ | |
36 | ||
37 | static int | |
38 | affs_toupper(int ch) | |
39 | { | |
40 | return ch >= 'a' && ch <= 'z' ? ch -= ('a' - 'A') : ch; | |
41 | } | |
42 | ||
43 | /* International toupper() for DOS\3 ("international") */ | |
44 | ||
45 | static int | |
46 | affs_intl_toupper(int ch) | |
47 | { | |
48 | return (ch >= 'a' && ch <= 'z') || (ch >= 0xE0 | |
49 | && ch <= 0xFE && ch != 0xF7) ? | |
50 | ch - ('a' - 'A') : ch; | |
51 | } | |
52 | ||
53 | static inline toupper_t | |
54 | affs_get_toupper(struct super_block *sb) | |
55 | { | |
56 | return AFFS_SB(sb)->s_flags & SF_INTL ? affs_intl_toupper : affs_toupper; | |
57 | } | |
58 | ||
59 | /* | |
60 | * Note: the dentry argument is the parent dentry. | |
61 | */ | |
62 | static inline int | |
8ca57722 | 63 | __affs_hash_dentry(struct qstr *qstr, toupper_t toupper, bool notruncate) |
1da177e4 LT |
64 | { |
65 | const u8 *name = qstr->name; | |
66 | unsigned long hash; | |
67 | int i; | |
68 | ||
8ca57722 | 69 | i = affs_check_name(qstr->name, qstr->len, notruncate); |
1da177e4 LT |
70 | if (i) |
71 | return i; | |
72 | ||
73 | hash = init_name_hash(); | |
74 | i = min(qstr->len, 30u); | |
75 | for (; i > 0; name++, i--) | |
76 | hash = partial_name_hash(toupper(*name), hash); | |
77 | qstr->hash = end_name_hash(hash); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static int | |
da53be12 | 83 | affs_hash_dentry(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 | 84 | { |
8ca57722 FF |
85 | return __affs_hash_dentry(qstr, affs_toupper, |
86 | affs_nofilenametruncate(dentry)); | |
87 | ||
1da177e4 | 88 | } |
8ca57722 | 89 | |
1da177e4 | 90 | static int |
da53be12 | 91 | affs_intl_hash_dentry(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 | 92 | { |
8ca57722 FF |
93 | return __affs_hash_dentry(qstr, affs_intl_toupper, |
94 | affs_nofilenametruncate(dentry)); | |
95 | ||
1da177e4 LT |
96 | } |
97 | ||
621e155a | 98 | static inline int __affs_compare_dentry(unsigned int len, |
8ca57722 FF |
99 | const char *str, const struct qstr *name, toupper_t toupper, |
100 | bool notruncate) | |
1da177e4 | 101 | { |
621e155a NP |
102 | const u8 *aname = str; |
103 | const u8 *bname = name->name; | |
1da177e4 | 104 | |
621e155a NP |
105 | /* |
106 | * 'str' is the name of an already existing dentry, so the name | |
107 | * must be valid. 'name' must be validated first. | |
1da177e4 LT |
108 | */ |
109 | ||
8ca57722 | 110 | if (affs_check_name(name->name, name->len, notruncate)) |
1da177e4 LT |
111 | return 1; |
112 | ||
621e155a NP |
113 | /* |
114 | * If the names are longer than the allowed 30 chars, | |
1da177e4 LT |
115 | * the excess is ignored, so their length may differ. |
116 | */ | |
1da177e4 | 117 | if (len >= 30) { |
621e155a | 118 | if (name->len < 30) |
1da177e4 LT |
119 | return 1; |
120 | len = 30; | |
621e155a | 121 | } else if (len != name->len) |
1da177e4 LT |
122 | return 1; |
123 | ||
124 | for (; len > 0; len--) | |
125 | if (toupper(*aname++) != toupper(*bname++)) | |
126 | return 1; | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static int | |
da53be12 | 132 | affs_compare_dentry(const struct dentry *parent, const struct dentry *dentry, |
621e155a | 133 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 134 | { |
8ca57722 FF |
135 | |
136 | return __affs_compare_dentry(len, str, name, affs_toupper, | |
137 | affs_nofilenametruncate(parent)); | |
1da177e4 | 138 | } |
8ca57722 | 139 | |
1da177e4 | 140 | static int |
da53be12 | 141 | affs_intl_compare_dentry(const struct dentry *parent, const struct dentry *dentry, |
621e155a | 142 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 143 | { |
8ca57722 FF |
144 | return __affs_compare_dentry(len, str, name, affs_intl_toupper, |
145 | affs_nofilenametruncate(parent)); | |
146 | ||
1da177e4 LT |
147 | } |
148 | ||
149 | /* | |
150 | * NOTE! unlike strncmp, affs_match returns 1 for success, 0 for failure. | |
151 | */ | |
152 | ||
153 | static inline int | |
154 | affs_match(struct dentry *dentry, const u8 *name2, toupper_t toupper) | |
155 | { | |
156 | const u8 *name = dentry->d_name.name; | |
157 | int len = dentry->d_name.len; | |
158 | ||
159 | if (len >= 30) { | |
160 | if (*name2 < 30) | |
161 | return 0; | |
162 | len = 30; | |
163 | } else if (len != *name2) | |
164 | return 0; | |
165 | ||
166 | for (name2++; len > 0; len--) | |
167 | if (toupper(*name++) != toupper(*name2++)) | |
168 | return 0; | |
169 | return 1; | |
170 | } | |
171 | ||
172 | int | |
173 | affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len) | |
174 | { | |
175 | toupper_t toupper = affs_get_toupper(sb); | |
176 | int hash; | |
177 | ||
178 | hash = len = min(len, 30u); | |
179 | for (; len > 0; len--) | |
180 | hash = (hash * 13 + toupper(*name++)) & 0x7ff; | |
181 | ||
182 | return hash % AFFS_SB(sb)->s_hashsize; | |
183 | } | |
184 | ||
185 | static struct buffer_head * | |
186 | affs_find_entry(struct inode *dir, struct dentry *dentry) | |
187 | { | |
188 | struct super_block *sb = dir->i_sb; | |
189 | struct buffer_head *bh; | |
190 | toupper_t toupper = affs_get_toupper(sb); | |
191 | u32 key; | |
192 | ||
193 | pr_debug("AFFS: find_entry(\"%.*s\")\n", (int)dentry->d_name.len, dentry->d_name.name); | |
194 | ||
195 | bh = affs_bread(sb, dir->i_ino); | |
196 | if (!bh) | |
197 | return ERR_PTR(-EIO); | |
198 | ||
199 | key = be32_to_cpu(AFFS_HEAD(bh)->table[affs_hash_name(sb, dentry->d_name.name, dentry->d_name.len)]); | |
200 | ||
201 | for (;;) { | |
202 | affs_brelse(bh); | |
203 | if (key == 0) | |
204 | return NULL; | |
205 | bh = affs_bread(sb, key); | |
206 | if (!bh) | |
207 | return ERR_PTR(-EIO); | |
208 | if (affs_match(dentry, AFFS_TAIL(sb, bh)->name, toupper)) | |
209 | return bh; | |
210 | key = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain); | |
211 | } | |
212 | } | |
213 | ||
214 | struct dentry * | |
00cd8dd3 | 215 | affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
216 | { |
217 | struct super_block *sb = dir->i_sb; | |
218 | struct buffer_head *bh; | |
219 | struct inode *inode = NULL; | |
220 | ||
221 | pr_debug("AFFS: lookup(\"%.*s\")\n",(int)dentry->d_name.len,dentry->d_name.name); | |
222 | ||
223 | affs_lock_dir(dir); | |
224 | bh = affs_find_entry(dir, dentry); | |
225 | affs_unlock_dir(dir); | |
210f8559 | 226 | if (IS_ERR(bh)) |
e231c2ee | 227 | return ERR_CAST(bh); |
1da177e4 LT |
228 | if (bh) { |
229 | u32 ino = bh->b_blocknr; | |
230 | ||
231 | /* store the real header ino in d_fsdata for faster lookups */ | |
232 | dentry->d_fsdata = (void *)(long)ino; | |
233 | switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) { | |
234 | //link to dirs disabled | |
235 | //case ST_LINKDIR: | |
236 | case ST_LINKFILE: | |
237 | ino = be32_to_cpu(AFFS_TAIL(sb, bh)->original); | |
238 | } | |
239 | affs_brelse(bh); | |
210f8559 DH |
240 | inode = affs_iget(sb, ino); |
241 | if (IS_ERR(inode)) | |
cccad8f9 | 242 | return ERR_CAST(inode); |
1da177e4 | 243 | } |
1da177e4 LT |
244 | d_add(dentry, inode); |
245 | return NULL; | |
246 | } | |
247 | ||
248 | int | |
249 | affs_unlink(struct inode *dir, struct dentry *dentry) | |
250 | { | |
dca3c336 RZ |
251 | pr_debug("AFFS: unlink(dir=%d, %lu \"%.*s\")\n", (u32)dir->i_ino, |
252 | dentry->d_inode->i_ino, | |
1da177e4 LT |
253 | (int)dentry->d_name.len, dentry->d_name.name); |
254 | ||
255 | return affs_remove_header(dentry); | |
256 | } | |
257 | ||
258 | int | |
ebfc3b49 | 259 | affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) |
1da177e4 LT |
260 | { |
261 | struct super_block *sb = dir->i_sb; | |
262 | struct inode *inode; | |
263 | int error; | |
264 | ||
4acdaf27 | 265 | pr_debug("AFFS: create(%lu,\"%.*s\",0%ho)\n",dir->i_ino,(int)dentry->d_name.len, |
1da177e4 LT |
266 | dentry->d_name.name,mode); |
267 | ||
268 | inode = affs_new_inode(dir); | |
269 | if (!inode) | |
270 | return -ENOSPC; | |
271 | ||
272 | inode->i_mode = mode; | |
273 | mode_to_prot(inode); | |
274 | mark_inode_dirty(inode); | |
275 | ||
276 | inode->i_op = &affs_file_inode_operations; | |
277 | inode->i_fop = &affs_file_operations; | |
278 | inode->i_mapping->a_ops = (AFFS_SB(sb)->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops; | |
279 | error = affs_add_entry(dir, inode, dentry, ST_FILE); | |
280 | if (error) { | |
6d6b77f1 | 281 | clear_nlink(inode); |
1da177e4 LT |
282 | iput(inode); |
283 | return error; | |
284 | } | |
285 | return 0; | |
286 | } | |
287 | ||
288 | int | |
18bb1db3 | 289 | affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
290 | { |
291 | struct inode *inode; | |
292 | int error; | |
293 | ||
18bb1db3 | 294 | pr_debug("AFFS: mkdir(%lu,\"%.*s\",0%ho)\n",dir->i_ino, |
1da177e4 LT |
295 | (int)dentry->d_name.len,dentry->d_name.name,mode); |
296 | ||
297 | inode = affs_new_inode(dir); | |
298 | if (!inode) | |
299 | return -ENOSPC; | |
300 | ||
301 | inode->i_mode = S_IFDIR | mode; | |
302 | mode_to_prot(inode); | |
303 | ||
304 | inode->i_op = &affs_dir_inode_operations; | |
305 | inode->i_fop = &affs_dir_operations; | |
306 | ||
307 | error = affs_add_entry(dir, inode, dentry, ST_USERDIR); | |
308 | if (error) { | |
6d6b77f1 | 309 | clear_nlink(inode); |
1da177e4 LT |
310 | mark_inode_dirty(inode); |
311 | iput(inode); | |
312 | return error; | |
313 | } | |
314 | return 0; | |
315 | } | |
316 | ||
317 | int | |
318 | affs_rmdir(struct inode *dir, struct dentry *dentry) | |
319 | { | |
dca3c336 RZ |
320 | pr_debug("AFFS: rmdir(dir=%u, %lu \"%.*s\")\n", (u32)dir->i_ino, |
321 | dentry->d_inode->i_ino, | |
1da177e4 LT |
322 | (int)dentry->d_name.len, dentry->d_name.name); |
323 | ||
324 | return affs_remove_header(dentry); | |
325 | } | |
326 | ||
327 | int | |
328 | affs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
329 | { | |
330 | struct super_block *sb = dir->i_sb; | |
331 | struct buffer_head *bh; | |
332 | struct inode *inode; | |
333 | char *p; | |
334 | int i, maxlen, error; | |
335 | char c, lc; | |
336 | ||
337 | pr_debug("AFFS: symlink(%lu,\"%.*s\" -> \"%s\")\n",dir->i_ino, | |
338 | (int)dentry->d_name.len,dentry->d_name.name,symname); | |
339 | ||
340 | maxlen = AFFS_SB(sb)->s_hashsize * sizeof(u32) - 1; | |
341 | inode = affs_new_inode(dir); | |
342 | if (!inode) | |
343 | return -ENOSPC; | |
344 | ||
345 | inode->i_op = &affs_symlink_inode_operations; | |
346 | inode->i_data.a_ops = &affs_symlink_aops; | |
347 | inode->i_mode = S_IFLNK | 0777; | |
348 | mode_to_prot(inode); | |
349 | ||
350 | error = -EIO; | |
351 | bh = affs_bread(sb, inode->i_ino); | |
352 | if (!bh) | |
353 | goto err; | |
354 | i = 0; | |
355 | p = (char *)AFFS_HEAD(bh)->table; | |
356 | lc = '/'; | |
357 | if (*symname == '/') { | |
29333920 | 358 | struct affs_sb_info *sbi = AFFS_SB(sb); |
1da177e4 LT |
359 | while (*symname == '/') |
360 | symname++; | |
29333920 AV |
361 | spin_lock(&sbi->symlink_lock); |
362 | while (sbi->s_volume[i]) /* Cannot overflow */ | |
363 | *p++ = sbi->s_volume[i++]; | |
364 | spin_unlock(&sbi->symlink_lock); | |
1da177e4 LT |
365 | } |
366 | while (i < maxlen && (c = *symname++)) { | |
367 | if (c == '.' && lc == '/' && *symname == '.' && symname[1] == '/') { | |
368 | *p++ = '/'; | |
369 | i++; | |
370 | symname += 2; | |
371 | lc = '/'; | |
372 | } else if (c == '.' && lc == '/' && *symname == '/') { | |
373 | symname++; | |
374 | lc = '/'; | |
375 | } else { | |
376 | *p++ = c; | |
377 | lc = c; | |
378 | i++; | |
379 | } | |
380 | if (lc == '/') | |
381 | while (*symname == '/') | |
382 | symname++; | |
383 | } | |
384 | *p = 0; | |
385 | mark_buffer_dirty_inode(bh, inode); | |
386 | affs_brelse(bh); | |
387 | mark_inode_dirty(inode); | |
388 | ||
389 | error = affs_add_entry(dir, inode, dentry, ST_SOFTLINK); | |
390 | if (error) | |
391 | goto err; | |
392 | ||
393 | return 0; | |
394 | ||
395 | err: | |
6d6b77f1 | 396 | clear_nlink(inode); |
1da177e4 LT |
397 | mark_inode_dirty(inode); |
398 | iput(inode); | |
399 | return error; | |
400 | } | |
401 | ||
402 | int | |
403 | affs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) | |
404 | { | |
405 | struct inode *inode = old_dentry->d_inode; | |
406 | ||
407 | pr_debug("AFFS: link(%u, %u, \"%.*s\")\n", (u32)inode->i_ino, (u32)dir->i_ino, | |
408 | (int)dentry->d_name.len,dentry->d_name.name); | |
409 | ||
410 | return affs_add_entry(dir, inode, dentry, ST_LINKFILE); | |
411 | } | |
412 | ||
413 | int | |
414 | affs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
415 | struct inode *new_dir, struct dentry *new_dentry) | |
416 | { | |
417 | struct super_block *sb = old_dir->i_sb; | |
418 | struct buffer_head *bh = NULL; | |
419 | int retval; | |
420 | ||
421 | pr_debug("AFFS: rename(old=%u,\"%*s\" to new=%u,\"%*s\")\n", | |
422 | (u32)old_dir->i_ino, (int)old_dentry->d_name.len, old_dentry->d_name.name, | |
423 | (u32)new_dir->i_ino, (int)new_dentry->d_name.len, new_dentry->d_name.name); | |
424 | ||
8ca57722 FF |
425 | retval = affs_check_name(new_dentry->d_name.name, |
426 | new_dentry->d_name.len, | |
427 | affs_nofilenametruncate(old_dentry)); | |
428 | ||
1da177e4 LT |
429 | if (retval) |
430 | return retval; | |
431 | ||
432 | /* Unlink destination if it already exists */ | |
433 | if (new_dentry->d_inode) { | |
434 | retval = affs_remove_header(new_dentry); | |
435 | if (retval) | |
436 | return retval; | |
437 | } | |
438 | ||
1da177e4 LT |
439 | bh = affs_bread(sb, old_dentry->d_inode->i_ino); |
440 | if (!bh) | |
3ac81413 | 441 | return -EIO; |
1da177e4 LT |
442 | |
443 | /* Remove header from its parent directory. */ | |
444 | affs_lock_dir(old_dir); | |
445 | retval = affs_remove_hash(old_dir, bh); | |
446 | affs_unlock_dir(old_dir); | |
447 | if (retval) | |
448 | goto done; | |
449 | ||
450 | /* And insert it into the new directory with the new name. */ | |
451 | affs_copy_name(AFFS_TAIL(sb, bh)->name, new_dentry); | |
452 | affs_fix_checksum(sb, bh); | |
453 | affs_lock_dir(new_dir); | |
454 | retval = affs_insert_hash(new_dir, bh); | |
455 | affs_unlock_dir(new_dir); | |
456 | /* TODO: move it back to old_dir, if error? */ | |
457 | ||
458 | done: | |
459 | mark_buffer_dirty_inode(bh, retval ? old_dir : new_dir); | |
460 | affs_brelse(bh); | |
461 | return retval; | |
462 | } |