Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/affs/amigaffs.c | |
4 | * | |
5 | * (c) 1996 Hans-Joachim Widmaier - Rewritten | |
6 | * | |
7 | * (C) 1993 Ray Burr - Amiga FFS filesystem. | |
8 | * | |
9 | * Please send bug reports to: hjw@zvw.de | |
10 | */ | |
11 | ||
db39c167 | 12 | #include <linux/math64.h> |
1da177e4 LT |
13 | #include "affs.h" |
14 | ||
1da177e4 LT |
15 | /* |
16 | * Functions for accessing Amiga-FFS structures. | |
17 | */ | |
18 | ||
19 | ||
20 | /* Insert a header block bh into the directory dir | |
21 | * caller must hold AFFS_DIR->i_hash_lock! | |
22 | */ | |
23 | ||
24 | int | |
25 | affs_insert_hash(struct inode *dir, struct buffer_head *bh) | |
26 | { | |
27 | struct super_block *sb = dir->i_sb; | |
28 | struct buffer_head *dir_bh; | |
29 | u32 ino, hash_ino; | |
30 | int offset; | |
31 | ||
32 | ino = bh->b_blocknr; | |
33 | offset = affs_hash_name(sb, AFFS_TAIL(sb, bh)->name + 1, AFFS_TAIL(sb, bh)->name[0]); | |
34 | ||
08fe100d | 35 | pr_debug("%s(dir=%lu, ino=%d)\n", __func__, dir->i_ino, ino); |
1da177e4 LT |
36 | |
37 | dir_bh = affs_bread(sb, dir->i_ino); | |
38 | if (!dir_bh) | |
39 | return -EIO; | |
40 | ||
41 | hash_ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[offset]); | |
42 | while (hash_ino) { | |
43 | affs_brelse(dir_bh); | |
44 | dir_bh = affs_bread(sb, hash_ino); | |
45 | if (!dir_bh) | |
46 | return -EIO; | |
47 | hash_ino = be32_to_cpu(AFFS_TAIL(sb, dir_bh)->hash_chain); | |
48 | } | |
49 | AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); | |
50 | AFFS_TAIL(sb, bh)->hash_chain = 0; | |
51 | affs_fix_checksum(sb, bh); | |
52 | ||
53 | if (dir->i_ino == dir_bh->b_blocknr) | |
54 | AFFS_HEAD(dir_bh)->table[offset] = cpu_to_be32(ino); | |
55 | else | |
56 | AFFS_TAIL(sb, dir_bh)->hash_chain = cpu_to_be32(ino); | |
57 | ||
58 | affs_adjust_checksum(dir_bh, ino); | |
59 | mark_buffer_dirty_inode(dir_bh, dir); | |
60 | affs_brelse(dir_bh); | |
61 | ||
02027d42 | 62 | dir->i_mtime = dir->i_ctime = current_time(dir); |
1da177e4 LT |
63 | dir->i_version++; |
64 | mark_inode_dirty(dir); | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | /* Remove a header block from its directory. | |
70 | * caller must hold AFFS_DIR->i_hash_lock! | |
71 | */ | |
72 | ||
73 | int | |
74 | affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh) | |
75 | { | |
76 | struct super_block *sb; | |
77 | struct buffer_head *bh; | |
78 | u32 rem_ino, hash_ino; | |
79 | __be32 ino; | |
80 | int offset, retval; | |
81 | ||
82 | sb = dir->i_sb; | |
83 | rem_ino = rem_bh->b_blocknr; | |
84 | offset = affs_hash_name(sb, AFFS_TAIL(sb, rem_bh)->name+1, AFFS_TAIL(sb, rem_bh)->name[0]); | |
08fe100d GU |
85 | pr_debug("%s(dir=%lu, ino=%d, hashval=%d)\n", __func__, dir->i_ino, |
86 | rem_ino, offset); | |
1da177e4 LT |
87 | |
88 | bh = affs_bread(sb, dir->i_ino); | |
89 | if (!bh) | |
90 | return -EIO; | |
91 | ||
92 | retval = -ENOENT; | |
93 | hash_ino = be32_to_cpu(AFFS_HEAD(bh)->table[offset]); | |
94 | while (hash_ino) { | |
95 | if (hash_ino == rem_ino) { | |
96 | ino = AFFS_TAIL(sb, rem_bh)->hash_chain; | |
97 | if (dir->i_ino == bh->b_blocknr) | |
98 | AFFS_HEAD(bh)->table[offset] = ino; | |
99 | else | |
100 | AFFS_TAIL(sb, bh)->hash_chain = ino; | |
101 | affs_adjust_checksum(bh, be32_to_cpu(ino) - hash_ino); | |
102 | mark_buffer_dirty_inode(bh, dir); | |
103 | AFFS_TAIL(sb, rem_bh)->parent = 0; | |
104 | retval = 0; | |
105 | break; | |
106 | } | |
107 | affs_brelse(bh); | |
108 | bh = affs_bread(sb, hash_ino); | |
109 | if (!bh) | |
110 | return -EIO; | |
111 | hash_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain); | |
112 | } | |
113 | ||
114 | affs_brelse(bh); | |
115 | ||
02027d42 | 116 | dir->i_mtime = dir->i_ctime = current_time(dir); |
1da177e4 LT |
117 | dir->i_version++; |
118 | mark_inode_dirty(dir); | |
119 | ||
120 | return retval; | |
121 | } | |
122 | ||
123 | static void | |
12447c40 | 124 | affs_fix_dcache(struct inode *inode, u32 entry_ino) |
1da177e4 | 125 | { |
12447c40 | 126 | struct dentry *dentry; |
873feea0 | 127 | spin_lock(&inode->i_lock); |
946e51f2 | 128 | hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) { |
1da177e4 | 129 | if (entry_ino == (u32)(long)dentry->d_fsdata) { |
12447c40 | 130 | dentry->d_fsdata = (void *)inode->i_ino; |
1da177e4 LT |
131 | break; |
132 | } | |
1da177e4 | 133 | } |
873feea0 | 134 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
135 | } |
136 | ||
137 | ||
138 | /* Remove header from link chain */ | |
139 | ||
140 | static int | |
141 | affs_remove_link(struct dentry *dentry) | |
142 | { | |
2b0143b5 | 143 | struct inode *dir, *inode = d_inode(dentry); |
1da177e4 | 144 | struct super_block *sb = inode->i_sb; |
4709187e | 145 | struct buffer_head *bh, *link_bh = NULL; |
1da177e4 LT |
146 | u32 link_ino, ino; |
147 | int retval; | |
148 | ||
9606d9aa | 149 | pr_debug("%s(key=%ld)\n", __func__, inode->i_ino); |
1da177e4 LT |
150 | retval = -EIO; |
151 | bh = affs_bread(sb, inode->i_ino); | |
152 | if (!bh) | |
153 | goto done; | |
154 | ||
155 | link_ino = (u32)(long)dentry->d_fsdata; | |
156 | if (inode->i_ino == link_ino) { | |
157 | /* we can't remove the head of the link, as its blocknr is still used as ino, | |
158 | * so we remove the block of the first link instead. | |
159 | */ | |
160 | link_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain); | |
161 | link_bh = affs_bread(sb, link_ino); | |
162 | if (!link_bh) | |
163 | goto done; | |
164 | ||
210f8559 DH |
165 | dir = affs_iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent)); |
166 | if (IS_ERR(dir)) { | |
167 | retval = PTR_ERR(dir); | |
1da177e4 | 168 | goto done; |
210f8559 | 169 | } |
1da177e4 LT |
170 | |
171 | affs_lock_dir(dir); | |
12447c40 AV |
172 | /* |
173 | * if there's a dentry for that block, make it | |
174 | * refer to inode itself. | |
175 | */ | |
176 | affs_fix_dcache(inode, link_ino); | |
1da177e4 | 177 | retval = affs_remove_hash(dir, link_bh); |
ec1ab0ab CH |
178 | if (retval) { |
179 | affs_unlock_dir(dir); | |
1da177e4 | 180 | goto done; |
ec1ab0ab | 181 | } |
1da177e4 LT |
182 | mark_buffer_dirty_inode(link_bh, inode); |
183 | ||
184 | memcpy(AFFS_TAIL(sb, bh)->name, AFFS_TAIL(sb, link_bh)->name, 32); | |
185 | retval = affs_insert_hash(dir, bh); | |
ec1ab0ab CH |
186 | if (retval) { |
187 | affs_unlock_dir(dir); | |
1da177e4 | 188 | goto done; |
ec1ab0ab | 189 | } |
1da177e4 LT |
190 | mark_buffer_dirty_inode(bh, inode); |
191 | ||
192 | affs_unlock_dir(dir); | |
193 | iput(dir); | |
194 | } else { | |
195 | link_bh = affs_bread(sb, link_ino); | |
196 | if (!link_bh) | |
197 | goto done; | |
198 | } | |
199 | ||
200 | while ((ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain)) != 0) { | |
201 | if (ino == link_ino) { | |
202 | __be32 ino2 = AFFS_TAIL(sb, link_bh)->link_chain; | |
203 | AFFS_TAIL(sb, bh)->link_chain = ino2; | |
204 | affs_adjust_checksum(bh, be32_to_cpu(ino2) - link_ino); | |
205 | mark_buffer_dirty_inode(bh, inode); | |
206 | retval = 0; | |
207 | /* Fix the link count, if bh is a normal header block without links */ | |
208 | switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) { | |
209 | case ST_LINKDIR: | |
210 | case ST_LINKFILE: | |
211 | break; | |
212 | default: | |
213 | if (!AFFS_TAIL(sb, bh)->link_chain) | |
bfe86848 | 214 | set_nlink(inode, 1); |
1da177e4 LT |
215 | } |
216 | affs_free_block(sb, link_ino); | |
217 | goto done; | |
218 | } | |
219 | affs_brelse(bh); | |
220 | bh = affs_bread(sb, ino); | |
221 | if (!bh) | |
222 | goto done; | |
223 | } | |
224 | retval = -ENOENT; | |
225 | done: | |
226 | affs_brelse(link_bh); | |
227 | affs_brelse(bh); | |
228 | return retval; | |
229 | } | |
230 | ||
231 | ||
232 | static int | |
233 | affs_empty_dir(struct inode *inode) | |
234 | { | |
235 | struct super_block *sb = inode->i_sb; | |
236 | struct buffer_head *bh; | |
237 | int retval, size; | |
238 | ||
239 | retval = -EIO; | |
240 | bh = affs_bread(sb, inode->i_ino); | |
241 | if (!bh) | |
242 | goto done; | |
243 | ||
244 | retval = -ENOTEMPTY; | |
245 | for (size = AFFS_SB(sb)->s_hashsize - 1; size >= 0; size--) | |
246 | if (AFFS_HEAD(bh)->table[size]) | |
247 | goto not_empty; | |
248 | retval = 0; | |
249 | not_empty: | |
250 | affs_brelse(bh); | |
251 | done: | |
252 | return retval; | |
253 | } | |
254 | ||
255 | ||
256 | /* Remove a filesystem object. If the object to be removed has | |
257 | * links to it, one of the links must be changed to inherit | |
258 | * the file or directory. As above, any inode will do. | |
259 | * The buffer will not be freed. If the header is a link, the | |
260 | * block will be marked as free. | |
261 | * This function returns a negative error number in case of | |
262 | * an error, else 0 if the inode is to be deleted or 1 if not. | |
263 | */ | |
264 | ||
265 | int | |
266 | affs_remove_header(struct dentry *dentry) | |
267 | { | |
268 | struct super_block *sb; | |
269 | struct inode *inode, *dir; | |
270 | struct buffer_head *bh = NULL; | |
271 | int retval; | |
272 | ||
2b0143b5 | 273 | dir = d_inode(dentry->d_parent); |
1da177e4 LT |
274 | sb = dir->i_sb; |
275 | ||
276 | retval = -ENOENT; | |
2b0143b5 | 277 | inode = d_inode(dentry); |
1da177e4 LT |
278 | if (!inode) |
279 | goto done; | |
280 | ||
9606d9aa | 281 | pr_debug("%s(key=%ld)\n", __func__, inode->i_ino); |
1da177e4 LT |
282 | retval = -EIO; |
283 | bh = affs_bread(sb, (u32)(long)dentry->d_fsdata); | |
284 | if (!bh) | |
285 | goto done; | |
286 | ||
287 | affs_lock_link(inode); | |
288 | affs_lock_dir(dir); | |
289 | switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) { | |
290 | case ST_USERDIR: | |
291 | /* if we ever want to support links to dirs | |
292 | * i_hash_lock of the inode must only be | |
293 | * taken after some checks | |
294 | */ | |
295 | affs_lock_dir(inode); | |
296 | retval = affs_empty_dir(inode); | |
297 | affs_unlock_dir(inode); | |
298 | if (retval) | |
299 | goto done_unlock; | |
300 | break; | |
301 | default: | |
302 | break; | |
303 | } | |
304 | ||
305 | retval = affs_remove_hash(dir, bh); | |
306 | if (retval) | |
307 | goto done_unlock; | |
308 | mark_buffer_dirty_inode(bh, inode); | |
309 | ||
310 | affs_unlock_dir(dir); | |
311 | ||
312 | if (inode->i_nlink > 1) | |
313 | retval = affs_remove_link(dentry); | |
314 | else | |
6d6b77f1 | 315 | clear_nlink(inode); |
1da177e4 | 316 | affs_unlock_link(inode); |
02027d42 | 317 | inode->i_ctime = current_time(inode); |
1da177e4 LT |
318 | mark_inode_dirty(inode); |
319 | ||
320 | done: | |
321 | affs_brelse(bh); | |
322 | return retval; | |
323 | ||
324 | done_unlock: | |
325 | affs_unlock_dir(dir); | |
326 | affs_unlock_link(inode); | |
327 | goto done; | |
328 | } | |
329 | ||
330 | /* Checksum a block, do various consistency checks and optionally return | |
331 | the blocks type number. DATA points to the block. If their pointers | |
332 | are non-null, *PTYPE and *STYPE are set to the primary and secondary | |
333 | block types respectively, *HASHSIZE is set to the size of the hashtable | |
334 | (which lets us calculate the block size). | |
335 | Returns non-zero if the block is not consistent. */ | |
336 | ||
337 | u32 | |
338 | affs_checksum_block(struct super_block *sb, struct buffer_head *bh) | |
339 | { | |
340 | __be32 *ptr = (__be32 *)bh->b_data; | |
341 | u32 sum; | |
342 | int bsize; | |
343 | ||
344 | sum = 0; | |
345 | for (bsize = sb->s_blocksize / sizeof(__be32); bsize > 0; bsize--) | |
346 | sum += be32_to_cpu(*ptr++); | |
347 | return sum; | |
348 | } | |
349 | ||
350 | /* | |
351 | * Calculate the checksum of a disk block and store it | |
352 | * at the indicated position. | |
353 | */ | |
354 | ||
355 | void | |
356 | affs_fix_checksum(struct super_block *sb, struct buffer_head *bh) | |
357 | { | |
358 | int cnt = sb->s_blocksize / sizeof(__be32); | |
359 | __be32 *ptr = (__be32 *)bh->b_data; | |
360 | u32 checksum; | |
361 | __be32 *checksumptr; | |
362 | ||
363 | checksumptr = ptr + 5; | |
364 | *checksumptr = 0; | |
365 | for (checksum = 0; cnt > 0; ptr++, cnt--) | |
366 | checksum += be32_to_cpu(*ptr); | |
367 | *checksumptr = cpu_to_be32(-checksum); | |
368 | } | |
369 | ||
370 | void | |
c1618208 | 371 | affs_secs_to_datestamp(time64_t secs, struct affs_date *ds) |
1da177e4 LT |
372 | { |
373 | u32 days; | |
374 | u32 minute; | |
db39c167 | 375 | s32 rem; |
1da177e4 LT |
376 | |
377 | secs -= sys_tz.tz_minuteswest * 60 + ((8 * 365 + 2) * 24 * 60 * 60); | |
378 | if (secs < 0) | |
379 | secs = 0; | |
db39c167 D |
380 | days = div_s64_rem(secs, 86400, &rem); |
381 | minute = rem / 60; | |
382 | rem -= minute * 60; | |
1da177e4 LT |
383 | |
384 | ds->days = cpu_to_be32(days); | |
385 | ds->mins = cpu_to_be32(minute); | |
db39c167 | 386 | ds->ticks = cpu_to_be32(rem * 50); |
1da177e4 LT |
387 | } |
388 | ||
a760b03d | 389 | umode_t |
c1618208 | 390 | affs_prot_to_mode(u32 prot) |
1da177e4 | 391 | { |
a760b03d | 392 | umode_t mode = 0; |
1da177e4 LT |
393 | |
394 | if (!(prot & FIBF_NOWRITE)) | |
1bafd6f1 | 395 | mode |= 0200; |
1da177e4 | 396 | if (!(prot & FIBF_NOREAD)) |
1bafd6f1 | 397 | mode |= 0400; |
1da177e4 | 398 | if (!(prot & FIBF_NOEXECUTE)) |
1bafd6f1 | 399 | mode |= 0100; |
1da177e4 | 400 | if (prot & FIBF_GRP_WRITE) |
1bafd6f1 | 401 | mode |= 0020; |
1da177e4 | 402 | if (prot & FIBF_GRP_READ) |
1bafd6f1 | 403 | mode |= 0040; |
1da177e4 | 404 | if (prot & FIBF_GRP_EXECUTE) |
1bafd6f1 | 405 | mode |= 0010; |
1da177e4 | 406 | if (prot & FIBF_OTR_WRITE) |
1bafd6f1 | 407 | mode |= 0002; |
1da177e4 | 408 | if (prot & FIBF_OTR_READ) |
1bafd6f1 | 409 | mode |= 0004; |
1da177e4 | 410 | if (prot & FIBF_OTR_EXECUTE) |
1bafd6f1 | 411 | mode |= 0001; |
1da177e4 LT |
412 | |
413 | return mode; | |
414 | } | |
415 | ||
416 | void | |
c1618208 | 417 | affs_mode_to_prot(struct inode *inode) |
1da177e4 LT |
418 | { |
419 | u32 prot = AFFS_I(inode)->i_protect; | |
a760b03d | 420 | umode_t mode = inode->i_mode; |
1da177e4 | 421 | |
1bafd6f1 | 422 | if (!(mode & 0100)) |
1da177e4 | 423 | prot |= FIBF_NOEXECUTE; |
1bafd6f1 | 424 | if (!(mode & 0400)) |
1da177e4 | 425 | prot |= FIBF_NOREAD; |
1bafd6f1 | 426 | if (!(mode & 0200)) |
1da177e4 | 427 | prot |= FIBF_NOWRITE; |
1bafd6f1 | 428 | if (mode & 0010) |
1da177e4 | 429 | prot |= FIBF_GRP_EXECUTE; |
1bafd6f1 | 430 | if (mode & 0040) |
1da177e4 | 431 | prot |= FIBF_GRP_READ; |
1bafd6f1 | 432 | if (mode & 0020) |
1da177e4 | 433 | prot |= FIBF_GRP_WRITE; |
1bafd6f1 | 434 | if (mode & 0001) |
1da177e4 | 435 | prot |= FIBF_OTR_EXECUTE; |
1bafd6f1 | 436 | if (mode & 0004) |
1da177e4 | 437 | prot |= FIBF_OTR_READ; |
1bafd6f1 | 438 | if (mode & 0002) |
1da177e4 LT |
439 | prot |= FIBF_OTR_WRITE; |
440 | ||
441 | AFFS_I(inode)->i_protect = prot; | |
442 | } | |
443 | ||
444 | void | |
445 | affs_error(struct super_block *sb, const char *function, const char *fmt, ...) | |
446 | { | |
1ee54b09 FF |
447 | struct va_format vaf; |
448 | va_list args; | |
1da177e4 | 449 | |
1ee54b09 FF |
450 | va_start(args, fmt); |
451 | vaf.fmt = fmt; | |
452 | vaf.va = &args; | |
453 | pr_crit("error (device %s): %s(): %pV\n", sb->s_id, function, &vaf); | |
bc98a42c | 454 | if (!sb_rdonly(sb)) |
0158de12 | 455 | pr_warn("Remounting filesystem read-only\n"); |
1751e8a6 | 456 | sb->s_flags |= SB_RDONLY; |
1ee54b09 | 457 | va_end(args); |
1da177e4 LT |
458 | } |
459 | ||
460 | void | |
461 | affs_warning(struct super_block *sb, const char *function, const char *fmt, ...) | |
462 | { | |
1ee54b09 FF |
463 | struct va_format vaf; |
464 | va_list args; | |
1da177e4 | 465 | |
1ee54b09 FF |
466 | va_start(args, fmt); |
467 | vaf.fmt = fmt; | |
468 | vaf.va = &args; | |
469 | pr_warn("(device %s): %s(): %pV\n", sb->s_id, function, &vaf); | |
1da177e4 | 470 | va_end(args); |
1da177e4 LT |
471 | } |
472 | ||
8ca57722 FF |
473 | bool |
474 | affs_nofilenametruncate(const struct dentry *dentry) | |
475 | { | |
e0b3f595 | 476 | return affs_test_opt(AFFS_SB(dentry->d_sb)->s_flags, SF_NO_TRUNCATE); |
8ca57722 FF |
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 | } |