Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/affs/amigaffs.c | |
3 | * | |
4 | * (c) 1996 Hans-Joachim Widmaier - Rewritten | |
5 | * | |
6 | * (C) 1993 Ray Burr - Amiga FFS filesystem. | |
7 | * | |
8 | * Please send bug reports to: hjw@zvw.de | |
9 | */ | |
10 | ||
11 | #include "affs.h" | |
12 | ||
1da177e4 LT |
13 | /* |
14 | * Functions for accessing Amiga-FFS structures. | |
15 | */ | |
16 | ||
17 | ||
18 | /* Insert a header block bh into the directory dir | |
19 | * caller must hold AFFS_DIR->i_hash_lock! | |
20 | */ | |
21 | ||
22 | int | |
23 | affs_insert_hash(struct inode *dir, struct buffer_head *bh) | |
24 | { | |
25 | struct super_block *sb = dir->i_sb; | |
26 | struct buffer_head *dir_bh; | |
27 | u32 ino, hash_ino; | |
28 | int offset; | |
29 | ||
30 | ino = bh->b_blocknr; | |
31 | offset = affs_hash_name(sb, AFFS_TAIL(sb, bh)->name + 1, AFFS_TAIL(sb, bh)->name[0]); | |
32 | ||
08fe100d | 33 | pr_debug("%s(dir=%lu, ino=%d)\n", __func__, dir->i_ino, ino); |
1da177e4 LT |
34 | |
35 | dir_bh = affs_bread(sb, dir->i_ino); | |
36 | if (!dir_bh) | |
37 | return -EIO; | |
38 | ||
39 | hash_ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[offset]); | |
40 | while (hash_ino) { | |
41 | affs_brelse(dir_bh); | |
42 | dir_bh = affs_bread(sb, hash_ino); | |
43 | if (!dir_bh) | |
44 | return -EIO; | |
45 | hash_ino = be32_to_cpu(AFFS_TAIL(sb, dir_bh)->hash_chain); | |
46 | } | |
47 | AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); | |
48 | AFFS_TAIL(sb, bh)->hash_chain = 0; | |
49 | affs_fix_checksum(sb, bh); | |
50 | ||
51 | if (dir->i_ino == dir_bh->b_blocknr) | |
52 | AFFS_HEAD(dir_bh)->table[offset] = cpu_to_be32(ino); | |
53 | else | |
54 | AFFS_TAIL(sb, dir_bh)->hash_chain = cpu_to_be32(ino); | |
55 | ||
56 | affs_adjust_checksum(dir_bh, ino); | |
57 | mark_buffer_dirty_inode(dir_bh, dir); | |
58 | affs_brelse(dir_bh); | |
59 | ||
60 | dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; | |
61 | dir->i_version++; | |
62 | mark_inode_dirty(dir); | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | /* Remove a header block from its directory. | |
68 | * caller must hold AFFS_DIR->i_hash_lock! | |
69 | */ | |
70 | ||
71 | int | |
72 | affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh) | |
73 | { | |
74 | struct super_block *sb; | |
75 | struct buffer_head *bh; | |
76 | u32 rem_ino, hash_ino; | |
77 | __be32 ino; | |
78 | int offset, retval; | |
79 | ||
80 | sb = dir->i_sb; | |
81 | rem_ino = rem_bh->b_blocknr; | |
82 | offset = affs_hash_name(sb, AFFS_TAIL(sb, rem_bh)->name+1, AFFS_TAIL(sb, rem_bh)->name[0]); | |
08fe100d GU |
83 | pr_debug("%s(dir=%lu, ino=%d, hashval=%d)\n", __func__, dir->i_ino, |
84 | rem_ino, offset); | |
1da177e4 LT |
85 | |
86 | bh = affs_bread(sb, dir->i_ino); | |
87 | if (!bh) | |
88 | return -EIO; | |
89 | ||
90 | retval = -ENOENT; | |
91 | hash_ino = be32_to_cpu(AFFS_HEAD(bh)->table[offset]); | |
92 | while (hash_ino) { | |
93 | if (hash_ino == rem_ino) { | |
94 | ino = AFFS_TAIL(sb, rem_bh)->hash_chain; | |
95 | if (dir->i_ino == bh->b_blocknr) | |
96 | AFFS_HEAD(bh)->table[offset] = ino; | |
97 | else | |
98 | AFFS_TAIL(sb, bh)->hash_chain = ino; | |
99 | affs_adjust_checksum(bh, be32_to_cpu(ino) - hash_ino); | |
100 | mark_buffer_dirty_inode(bh, dir); | |
101 | AFFS_TAIL(sb, rem_bh)->parent = 0; | |
102 | retval = 0; | |
103 | break; | |
104 | } | |
105 | affs_brelse(bh); | |
106 | bh = affs_bread(sb, hash_ino); | |
107 | if (!bh) | |
108 | return -EIO; | |
109 | hash_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain); | |
110 | } | |
111 | ||
112 | affs_brelse(bh); | |
113 | ||
114 | dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; | |
115 | dir->i_version++; | |
116 | mark_inode_dirty(dir); | |
117 | ||
118 | return retval; | |
119 | } | |
120 | ||
121 | static void | |
12447c40 | 122 | affs_fix_dcache(struct inode *inode, u32 entry_ino) |
1da177e4 | 123 | { |
12447c40 | 124 | struct dentry *dentry; |
873feea0 | 125 | spin_lock(&inode->i_lock); |
946e51f2 | 126 | hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) { |
1da177e4 | 127 | if (entry_ino == (u32)(long)dentry->d_fsdata) { |
12447c40 | 128 | dentry->d_fsdata = (void *)inode->i_ino; |
1da177e4 LT |
129 | break; |
130 | } | |
1da177e4 | 131 | } |
873feea0 | 132 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
133 | } |
134 | ||
135 | ||
136 | /* Remove header from link chain */ | |
137 | ||
138 | static int | |
139 | affs_remove_link(struct dentry *dentry) | |
140 | { | |
141 | struct inode *dir, *inode = dentry->d_inode; | |
142 | struct super_block *sb = inode->i_sb; | |
143 | struct buffer_head *bh = NULL, *link_bh = NULL; | |
144 | u32 link_ino, ino; | |
145 | int retval; | |
146 | ||
9606d9aa | 147 | pr_debug("%s(key=%ld)\n", __func__, inode->i_ino); |
1da177e4 LT |
148 | retval = -EIO; |
149 | bh = affs_bread(sb, inode->i_ino); | |
150 | if (!bh) | |
151 | goto done; | |
152 | ||
153 | link_ino = (u32)(long)dentry->d_fsdata; | |
154 | if (inode->i_ino == link_ino) { | |
155 | /* we can't remove the head of the link, as its blocknr is still used as ino, | |
156 | * so we remove the block of the first link instead. | |
157 | */ | |
158 | link_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain); | |
159 | link_bh = affs_bread(sb, link_ino); | |
160 | if (!link_bh) | |
161 | goto done; | |
162 | ||
210f8559 DH |
163 | dir = affs_iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent)); |
164 | if (IS_ERR(dir)) { | |
165 | retval = PTR_ERR(dir); | |
1da177e4 | 166 | goto done; |
210f8559 | 167 | } |
1da177e4 LT |
168 | |
169 | affs_lock_dir(dir); | |
12447c40 AV |
170 | /* |
171 | * if there's a dentry for that block, make it | |
172 | * refer to inode itself. | |
173 | */ | |
174 | affs_fix_dcache(inode, link_ino); | |
1da177e4 | 175 | retval = affs_remove_hash(dir, link_bh); |
ec1ab0ab CH |
176 | if (retval) { |
177 | affs_unlock_dir(dir); | |
1da177e4 | 178 | goto done; |
ec1ab0ab | 179 | } |
1da177e4 LT |
180 | mark_buffer_dirty_inode(link_bh, inode); |
181 | ||
182 | memcpy(AFFS_TAIL(sb, bh)->name, AFFS_TAIL(sb, link_bh)->name, 32); | |
183 | retval = affs_insert_hash(dir, bh); | |
ec1ab0ab CH |
184 | if (retval) { |
185 | affs_unlock_dir(dir); | |
1da177e4 | 186 | goto done; |
ec1ab0ab | 187 | } |
1da177e4 LT |
188 | mark_buffer_dirty_inode(bh, inode); |
189 | ||
190 | affs_unlock_dir(dir); | |
191 | iput(dir); | |
192 | } else { | |
193 | link_bh = affs_bread(sb, link_ino); | |
194 | if (!link_bh) | |
195 | goto done; | |
196 | } | |
197 | ||
198 | while ((ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain)) != 0) { | |
199 | if (ino == link_ino) { | |
200 | __be32 ino2 = AFFS_TAIL(sb, link_bh)->link_chain; | |
201 | AFFS_TAIL(sb, bh)->link_chain = ino2; | |
202 | affs_adjust_checksum(bh, be32_to_cpu(ino2) - link_ino); | |
203 | mark_buffer_dirty_inode(bh, inode); | |
204 | retval = 0; | |
205 | /* Fix the link count, if bh is a normal header block without links */ | |
206 | switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) { | |
207 | case ST_LINKDIR: | |
208 | case ST_LINKFILE: | |
209 | break; | |
210 | default: | |
211 | if (!AFFS_TAIL(sb, bh)->link_chain) | |
bfe86848 | 212 | set_nlink(inode, 1); |
1da177e4 LT |
213 | } |
214 | affs_free_block(sb, link_ino); | |
215 | goto done; | |
216 | } | |
217 | affs_brelse(bh); | |
218 | bh = affs_bread(sb, ino); | |
219 | if (!bh) | |
220 | goto done; | |
221 | } | |
222 | retval = -ENOENT; | |
223 | done: | |
224 | affs_brelse(link_bh); | |
225 | affs_brelse(bh); | |
226 | return retval; | |
227 | } | |
228 | ||
229 | ||
230 | static int | |
231 | affs_empty_dir(struct inode *inode) | |
232 | { | |
233 | struct super_block *sb = inode->i_sb; | |
234 | struct buffer_head *bh; | |
235 | int retval, size; | |
236 | ||
237 | retval = -EIO; | |
238 | bh = affs_bread(sb, inode->i_ino); | |
239 | if (!bh) | |
240 | goto done; | |
241 | ||
242 | retval = -ENOTEMPTY; | |
243 | for (size = AFFS_SB(sb)->s_hashsize - 1; size >= 0; size--) | |
244 | if (AFFS_HEAD(bh)->table[size]) | |
245 | goto not_empty; | |
246 | retval = 0; | |
247 | not_empty: | |
248 | affs_brelse(bh); | |
249 | done: | |
250 | return retval; | |
251 | } | |
252 | ||
253 | ||
254 | /* Remove a filesystem object. If the object to be removed has | |
255 | * links to it, one of the links must be changed to inherit | |
256 | * the file or directory. As above, any inode will do. | |
257 | * The buffer will not be freed. If the header is a link, the | |
258 | * block will be marked as free. | |
259 | * This function returns a negative error number in case of | |
260 | * an error, else 0 if the inode is to be deleted or 1 if not. | |
261 | */ | |
262 | ||
263 | int | |
264 | affs_remove_header(struct dentry *dentry) | |
265 | { | |
266 | struct super_block *sb; | |
267 | struct inode *inode, *dir; | |
268 | struct buffer_head *bh = NULL; | |
269 | int retval; | |
270 | ||
271 | dir = dentry->d_parent->d_inode; | |
272 | sb = dir->i_sb; | |
273 | ||
274 | retval = -ENOENT; | |
275 | inode = dentry->d_inode; | |
276 | if (!inode) | |
277 | goto done; | |
278 | ||
9606d9aa | 279 | pr_debug("%s(key=%ld)\n", __func__, inode->i_ino); |
1da177e4 LT |
280 | retval = -EIO; |
281 | bh = affs_bread(sb, (u32)(long)dentry->d_fsdata); | |
282 | if (!bh) | |
283 | goto done; | |
284 | ||
285 | affs_lock_link(inode); | |
286 | affs_lock_dir(dir); | |
287 | switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) { | |
288 | case ST_USERDIR: | |
289 | /* if we ever want to support links to dirs | |
290 | * i_hash_lock of the inode must only be | |
291 | * taken after some checks | |
292 | */ | |
293 | affs_lock_dir(inode); | |
294 | retval = affs_empty_dir(inode); | |
295 | affs_unlock_dir(inode); | |
296 | if (retval) | |
297 | goto done_unlock; | |
298 | break; | |
299 | default: | |
300 | break; | |
301 | } | |
302 | ||
303 | retval = affs_remove_hash(dir, bh); | |
304 | if (retval) | |
305 | goto done_unlock; | |
306 | mark_buffer_dirty_inode(bh, inode); | |
307 | ||
308 | affs_unlock_dir(dir); | |
309 | ||
310 | if (inode->i_nlink > 1) | |
311 | retval = affs_remove_link(dentry); | |
312 | else | |
6d6b77f1 | 313 | clear_nlink(inode); |
1da177e4 LT |
314 | affs_unlock_link(inode); |
315 | inode->i_ctime = CURRENT_TIME_SEC; | |
316 | mark_inode_dirty(inode); | |
317 | ||
318 | done: | |
319 | affs_brelse(bh); | |
320 | return retval; | |
321 | ||
322 | done_unlock: | |
323 | affs_unlock_dir(dir); | |
324 | affs_unlock_link(inode); | |
325 | goto done; | |
326 | } | |
327 | ||
328 | /* Checksum a block, do various consistency checks and optionally return | |
329 | the blocks type number. DATA points to the block. If their pointers | |
330 | are non-null, *PTYPE and *STYPE are set to the primary and secondary | |
331 | block types respectively, *HASHSIZE is set to the size of the hashtable | |
332 | (which lets us calculate the block size). | |
333 | Returns non-zero if the block is not consistent. */ | |
334 | ||
335 | u32 | |
336 | affs_checksum_block(struct super_block *sb, struct buffer_head *bh) | |
337 | { | |
338 | __be32 *ptr = (__be32 *)bh->b_data; | |
339 | u32 sum; | |
340 | int bsize; | |
341 | ||
342 | sum = 0; | |
343 | for (bsize = sb->s_blocksize / sizeof(__be32); bsize > 0; bsize--) | |
344 | sum += be32_to_cpu(*ptr++); | |
345 | return sum; | |
346 | } | |
347 | ||
348 | /* | |
349 | * Calculate the checksum of a disk block and store it | |
350 | * at the indicated position. | |
351 | */ | |
352 | ||
353 | void | |
354 | affs_fix_checksum(struct super_block *sb, struct buffer_head *bh) | |
355 | { | |
356 | int cnt = sb->s_blocksize / sizeof(__be32); | |
357 | __be32 *ptr = (__be32 *)bh->b_data; | |
358 | u32 checksum; | |
359 | __be32 *checksumptr; | |
360 | ||
361 | checksumptr = ptr + 5; | |
362 | *checksumptr = 0; | |
363 | for (checksum = 0; cnt > 0; ptr++, cnt--) | |
364 | checksum += be32_to_cpu(*ptr); | |
365 | *checksumptr = cpu_to_be32(-checksum); | |
366 | } | |
367 | ||
368 | void | |
369 | secs_to_datestamp(time_t secs, struct affs_date *ds) | |
370 | { | |
371 | u32 days; | |
372 | u32 minute; | |
373 | ||
374 | secs -= sys_tz.tz_minuteswest * 60 + ((8 * 365 + 2) * 24 * 60 * 60); | |
375 | if (secs < 0) | |
376 | secs = 0; | |
377 | days = secs / 86400; | |
378 | secs -= days * 86400; | |
379 | minute = secs / 60; | |
380 | secs -= minute * 60; | |
381 | ||
382 | ds->days = cpu_to_be32(days); | |
383 | ds->mins = cpu_to_be32(minute); | |
384 | ds->ticks = cpu_to_be32(secs * 50); | |
385 | } | |
386 | ||
a760b03d | 387 | umode_t |
1da177e4 LT |
388 | prot_to_mode(u32 prot) |
389 | { | |
a760b03d | 390 | umode_t mode = 0; |
1da177e4 LT |
391 | |
392 | if (!(prot & FIBF_NOWRITE)) | |
393 | mode |= S_IWUSR; | |
394 | if (!(prot & FIBF_NOREAD)) | |
395 | mode |= S_IRUSR; | |
396 | if (!(prot & FIBF_NOEXECUTE)) | |
397 | mode |= S_IXUSR; | |
398 | if (prot & FIBF_GRP_WRITE) | |
399 | mode |= S_IWGRP; | |
400 | if (prot & FIBF_GRP_READ) | |
401 | mode |= S_IRGRP; | |
402 | if (prot & FIBF_GRP_EXECUTE) | |
403 | mode |= S_IXGRP; | |
404 | if (prot & FIBF_OTR_WRITE) | |
405 | mode |= S_IWOTH; | |
406 | if (prot & FIBF_OTR_READ) | |
407 | mode |= S_IROTH; | |
408 | if (prot & FIBF_OTR_EXECUTE) | |
409 | mode |= S_IXOTH; | |
410 | ||
411 | return mode; | |
412 | } | |
413 | ||
414 | void | |
415 | mode_to_prot(struct inode *inode) | |
416 | { | |
417 | u32 prot = AFFS_I(inode)->i_protect; | |
a760b03d | 418 | umode_t mode = inode->i_mode; |
1da177e4 LT |
419 | |
420 | if (!(mode & S_IXUSR)) | |
421 | prot |= FIBF_NOEXECUTE; | |
422 | if (!(mode & S_IRUSR)) | |
423 | prot |= FIBF_NOREAD; | |
424 | if (!(mode & S_IWUSR)) | |
425 | prot |= FIBF_NOWRITE; | |
426 | if (mode & S_IXGRP) | |
427 | prot |= FIBF_GRP_EXECUTE; | |
428 | if (mode & S_IRGRP) | |
429 | prot |= FIBF_GRP_READ; | |
430 | if (mode & S_IWGRP) | |
431 | prot |= FIBF_GRP_WRITE; | |
432 | if (mode & S_IXOTH) | |
433 | prot |= FIBF_OTR_EXECUTE; | |
434 | if (mode & S_IROTH) | |
435 | prot |= FIBF_OTR_READ; | |
436 | if (mode & S_IWOTH) | |
437 | prot |= FIBF_OTR_WRITE; | |
438 | ||
439 | AFFS_I(inode)->i_protect = prot; | |
440 | } | |
441 | ||
442 | void | |
443 | affs_error(struct super_block *sb, const char *function, const char *fmt, ...) | |
444 | { | |
1ee54b09 FF |
445 | struct va_format vaf; |
446 | va_list args; | |
1da177e4 | 447 | |
1ee54b09 FF |
448 | va_start(args, fmt); |
449 | vaf.fmt = fmt; | |
450 | vaf.va = &args; | |
451 | pr_crit("error (device %s): %s(): %pV\n", sb->s_id, function, &vaf); | |
1da177e4 | 452 | if (!(sb->s_flags & MS_RDONLY)) |
0158de12 | 453 | pr_warn("Remounting filesystem read-only\n"); |
1da177e4 | 454 | sb->s_flags |= MS_RDONLY; |
1ee54b09 | 455 | va_end(args); |
1da177e4 LT |
456 | } |
457 | ||
458 | void | |
459 | affs_warning(struct super_block *sb, const char *function, const char *fmt, ...) | |
460 | { | |
1ee54b09 FF |
461 | struct va_format vaf; |
462 | va_list args; | |
1da177e4 | 463 | |
1ee54b09 FF |
464 | va_start(args, fmt); |
465 | vaf.fmt = fmt; | |
466 | vaf.va = &args; | |
467 | pr_warn("(device %s): %s(): %pV\n", sb->s_id, function, &vaf); | |
1da177e4 | 468 | va_end(args); |
1da177e4 LT |
469 | } |
470 | ||
8ca57722 FF |
471 | bool |
472 | affs_nofilenametruncate(const struct dentry *dentry) | |
473 | { | |
474 | struct inode *inode = dentry->d_inode; | |
475 | return AFFS_SB(inode->i_sb)->s_flags & SF_NO_TRUNCATE; | |
476 | ||
477 | } | |
478 | ||
1da177e4 LT |
479 | /* Check if the name is valid for a affs object. */ |
480 | ||
481 | int | |
8ca57722 | 482 | affs_check_name(const unsigned char *name, int len, bool notruncate) |
1da177e4 LT |
483 | { |
484 | int i; | |
485 | ||
f157853e | 486 | if (len > AFFSNAMEMAX) { |
8ca57722 FF |
487 | if (notruncate) |
488 | return -ENAMETOOLONG; | |
b4478e35 | 489 | len = AFFSNAMEMAX; |
8ca57722 | 490 | } |
1da177e4 LT |
491 | for (i = 0; i < len; i++) { |
492 | if (name[i] < ' ' || name[i] == ':' | |
493 | || (name[i] > 0x7e && name[i] < 0xa0)) | |
494 | return -EINVAL; | |
495 | } | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | /* This function copies name to bstr, with at most 30 | |
501 | * characters length. The bstr will be prepended by | |
502 | * a length byte. | |
503 | * NOTE: The name will must be already checked by | |
504 | * affs_check_name()! | |
505 | */ | |
506 | ||
507 | int | |
508 | affs_copy_name(unsigned char *bstr, struct dentry *dentry) | |
509 | { | |
f157853e | 510 | u32 len = min(dentry->d_name.len, AFFSNAMEMAX); |
1da177e4 LT |
511 | |
512 | *bstr++ = len; | |
513 | memcpy(bstr, dentry->d_name.name, len); | |
514 | return len; | |
515 | } |