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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/isofs/inode.c | |
3 | * | |
4 | * (C) 1991 Linus Torvalds - minix filesystem | |
5 | * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem. | |
96de0e25 | 6 | * 1994 Eberhard Mönkeberg - multi session handling. |
1da177e4 LT |
7 | * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs. |
8 | * 1997 Gordon Chaffee - Joliet CDs | |
9 | * 1998 Eric Lammerts - ISO 9660 Level 3 | |
10 | * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB | |
11 | * 2004 Paul Serice - NFS Export Operations | |
12 | */ | |
13 | ||
94f2f715 | 14 | #include <linux/init.h> |
1da177e4 LT |
15 | #include <linux/module.h> |
16 | ||
1da177e4 | 17 | #include <linux/slab.h> |
5b825c3a | 18 | #include <linux/cred.h> |
1da177e4 LT |
19 | #include <linux/nls.h> |
20 | #include <linux/ctype.h> | |
94f2f715 AV |
21 | #include <linux/statfs.h> |
22 | #include <linux/cdrom.h> | |
1da177e4 | 23 | #include <linux/parser.h> |
3069083c | 24 | #include <linux/mpage.h> |
ba64e2b9 | 25 | #include <linux/user_namespace.h> |
86a1da6d | 26 | #include <linux/seq_file.h> |
1da177e4 | 27 | |
94f2f715 | 28 | #include "isofs.h" |
1da177e4 LT |
29 | #include "zisofs.h" |
30 | ||
31 | #define BEQUIET | |
32 | ||
da53be12 | 33 | static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); |
6fa67e70 | 34 | static int isofs_dentry_cmpi(const struct dentry *dentry, |
621e155a | 35 | unsigned int len, const char *str, const struct qstr *name); |
1da177e4 LT |
36 | |
37 | #ifdef CONFIG_JOLIET | |
da53be12 LT |
38 | static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); |
39 | static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); | |
6fa67e70 | 40 | static int isofs_dentry_cmpi_ms(const struct dentry *dentry, |
621e155a | 41 | unsigned int len, const char *str, const struct qstr *name); |
6fa67e70 | 42 | static int isofs_dentry_cmp_ms(const struct dentry *dentry, |
621e155a | 43 | unsigned int len, const char *str, const struct qstr *name); |
1da177e4 LT |
44 | #endif |
45 | ||
46 | static void isofs_put_super(struct super_block *sb) | |
47 | { | |
48 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
6cfd0148 | 49 | |
1da177e4 | 50 | #ifdef CONFIG_JOLIET |
6d729e44 | 51 | unload_nls(sbi->s_nls_iocharset); |
1da177e4 LT |
52 | #endif |
53 | ||
1da177e4 LT |
54 | kfree(sbi); |
55 | sb->s_fs_info = NULL; | |
56 | return; | |
57 | } | |
58 | ||
410dd3cf | 59 | static int isofs_read_inode(struct inode *, int relocated); |
726c3342 | 60 | static int isofs_statfs (struct dentry *, struct kstatfs *); |
86a1da6d | 61 | static int isofs_show_options(struct seq_file *, struct dentry *); |
1da177e4 | 62 | |
e18b890b | 63 | static struct kmem_cache *isofs_inode_cachep; |
1da177e4 LT |
64 | |
65 | static struct inode *isofs_alloc_inode(struct super_block *sb) | |
66 | { | |
67 | struct iso_inode_info *ei; | |
e94b1766 | 68 | ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
69 | if (!ei) |
70 | return NULL; | |
71 | return &ei->vfs_inode; | |
72 | } | |
73 | ||
fa0d7e3d | 74 | static void isofs_i_callback(struct rcu_head *head) |
1da177e4 | 75 | { |
fa0d7e3d | 76 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
77 | kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); |
78 | } | |
79 | ||
fa0d7e3d NP |
80 | static void isofs_destroy_inode(struct inode *inode) |
81 | { | |
82 | call_rcu(&inode->i_rcu, isofs_i_callback); | |
83 | } | |
84 | ||
51cc5068 | 85 | static void init_once(void *foo) |
1da177e4 | 86 | { |
9eb7f2c6 | 87 | struct iso_inode_info *ei = foo; |
1da177e4 | 88 | |
a35afb83 | 89 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 90 | } |
c3ed85a3 | 91 | |
b3b749b7 | 92 | static int __init init_inodecache(void) |
1da177e4 LT |
93 | { |
94 | isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", | |
c3ed85a3 DJ |
95 | sizeof(struct iso_inode_info), |
96 | 0, (SLAB_RECLAIM_ACCOUNT| | |
5d097056 | 97 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 98 | init_once); |
1da177e4 LT |
99 | if (isofs_inode_cachep == NULL) |
100 | return -ENOMEM; | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static void destroy_inodecache(void) | |
105 | { | |
8c0a8537 KS |
106 | /* |
107 | * Make sure all delayed rcu free inodes are flushed before we | |
108 | * destroy cache. | |
109 | */ | |
110 | rcu_barrier(); | |
1a1d92c1 | 111 | kmem_cache_destroy(isofs_inode_cachep); |
1da177e4 LT |
112 | } |
113 | ||
114 | static int isofs_remount(struct super_block *sb, int *flags, char *data) | |
115 | { | |
02b9984d | 116 | sync_filesystem(sb); |
17b7f7cf JK |
117 | if (!(*flags & MS_RDONLY)) |
118 | return -EROFS; | |
1da177e4 LT |
119 | return 0; |
120 | } | |
121 | ||
ee9b6d61 | 122 | static const struct super_operations isofs_sops = { |
1da177e4 LT |
123 | .alloc_inode = isofs_alloc_inode, |
124 | .destroy_inode = isofs_destroy_inode, | |
1da177e4 LT |
125 | .put_super = isofs_put_super, |
126 | .statfs = isofs_statfs, | |
127 | .remount_fs = isofs_remount, | |
86a1da6d | 128 | .show_options = isofs_show_options, |
1da177e4 LT |
129 | }; |
130 | ||
131 | ||
e16404ed | 132 | static const struct dentry_operations isofs_dentry_ops[] = { |
1da177e4 LT |
133 | { |
134 | .d_hash = isofs_hashi, | |
135 | .d_compare = isofs_dentry_cmpi, | |
136 | }, | |
137 | #ifdef CONFIG_JOLIET | |
138 | { | |
139 | .d_hash = isofs_hash_ms, | |
140 | .d_compare = isofs_dentry_cmp_ms, | |
141 | }, | |
142 | { | |
143 | .d_hash = isofs_hashi_ms, | |
144 | .d_compare = isofs_dentry_cmpi_ms, | |
9eb7f2c6 | 145 | }, |
1da177e4 LT |
146 | #endif |
147 | }; | |
148 | ||
149 | struct iso9660_options{ | |
5404ac8e | 150 | unsigned int rock:1; |
8711c67b | 151 | unsigned int joliet:1; |
5404ac8e JK |
152 | unsigned int cruft:1; |
153 | unsigned int hide:1; | |
154 | unsigned int showassoc:1; | |
155 | unsigned int nocompress:1; | |
156 | unsigned int overriderockperm:1; | |
157 | unsigned int uid_set:1; | |
158 | unsigned int gid_set:1; | |
159 | unsigned int utf8:1; | |
160 | unsigned char map; | |
1da177e4 LT |
161 | unsigned char check; |
162 | unsigned int blocksize; | |
7328bdd6 AV |
163 | umode_t fmode; |
164 | umode_t dmode; | |
ba64e2b9 EB |
165 | kgid_t gid; |
166 | kuid_t uid; | |
1da177e4 | 167 | char *iocharset; |
c3ed85a3 DJ |
168 | /* LVE */ |
169 | s32 session; | |
170 | s32 sbsector; | |
1da177e4 LT |
171 | }; |
172 | ||
1da177e4 LT |
173 | /* |
174 | * Compute the hash for the isofs name corresponding to the dentry. | |
175 | */ | |
176 | static int | |
8387ff25 | 177 | isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) |
1da177e4 LT |
178 | { |
179 | const char *name; | |
180 | int len; | |
181 | char c; | |
182 | unsigned long hash; | |
183 | ||
184 | len = qstr->len; | |
185 | name = qstr->name; | |
186 | if (ms) { | |
187 | while (len && name[len-1] == '.') | |
188 | len--; | |
189 | } | |
190 | ||
8387ff25 | 191 | hash = init_name_hash(dentry); |
1da177e4 LT |
192 | while (len--) { |
193 | c = tolower(*name++); | |
f17e121f | 194 | hash = partial_name_hash(c, hash); |
1da177e4 LT |
195 | } |
196 | qstr->hash = end_name_hash(hash); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | /* | |
621e155a | 202 | * Compare of two isofs names. |
1da177e4 | 203 | */ |
621e155a NP |
204 | static int isofs_dentry_cmp_common( |
205 | unsigned int len, const char *str, | |
206 | const struct qstr *name, int ms, int ci) | |
1da177e4 LT |
207 | { |
208 | int alen, blen; | |
209 | ||
210 | /* A filename cannot end in '.' or we treat it like it has none */ | |
621e155a NP |
211 | alen = name->len; |
212 | blen = len; | |
1da177e4 | 213 | if (ms) { |
621e155a | 214 | while (alen && name->name[alen-1] == '.') |
1da177e4 | 215 | alen--; |
621e155a | 216 | while (blen && str[blen-1] == '.') |
1da177e4 LT |
217 | blen--; |
218 | } | |
219 | if (alen == blen) { | |
621e155a | 220 | if (ci) { |
a97df427 | 221 | if (strncasecmp(name->name, str, alen) == 0) |
621e155a NP |
222 | return 0; |
223 | } else { | |
224 | if (strncmp(name->name, str, alen) == 0) | |
225 | return 0; | |
226 | } | |
1da177e4 LT |
227 | } |
228 | return 1; | |
229 | } | |
230 | ||
1da177e4 | 231 | static int |
da53be12 | 232 | isofs_hashi(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 | 233 | { |
8387ff25 | 234 | return isofs_hashi_common(dentry, qstr, 0); |
1da177e4 LT |
235 | } |
236 | ||
1da177e4 | 237 | static int |
6fa67e70 | 238 | isofs_dentry_cmpi(const struct dentry *dentry, |
621e155a | 239 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 240 | { |
621e155a | 241 | return isofs_dentry_cmp_common(len, str, name, 0, 1); |
1da177e4 LT |
242 | } |
243 | ||
244 | #ifdef CONFIG_JOLIET | |
7ca2f234 AB |
245 | /* |
246 | * Compute the hash for the isofs name corresponding to the dentry. | |
247 | */ | |
248 | static int | |
8387ff25 | 249 | isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) |
7ca2f234 AB |
250 | { |
251 | const char *name; | |
252 | int len; | |
253 | ||
254 | len = qstr->len; | |
255 | name = qstr->name; | |
256 | if (ms) { | |
257 | while (len && name[len-1] == '.') | |
258 | len--; | |
259 | } | |
260 | ||
8387ff25 | 261 | qstr->hash = full_name_hash(dentry, name, len); |
7ca2f234 AB |
262 | |
263 | return 0; | |
264 | } | |
265 | ||
1da177e4 | 266 | static int |
da53be12 | 267 | isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 | 268 | { |
8387ff25 | 269 | return isofs_hash_common(dentry, qstr, 1); |
1da177e4 LT |
270 | } |
271 | ||
272 | static int | |
da53be12 | 273 | isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 | 274 | { |
8387ff25 | 275 | return isofs_hashi_common(dentry, qstr, 1); |
1da177e4 LT |
276 | } |
277 | ||
278 | static int | |
6fa67e70 | 279 | isofs_dentry_cmp_ms(const struct dentry *dentry, |
621e155a | 280 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 281 | { |
621e155a | 282 | return isofs_dentry_cmp_common(len, str, name, 1, 0); |
1da177e4 LT |
283 | } |
284 | ||
285 | static int | |
6fa67e70 | 286 | isofs_dentry_cmpi_ms(const struct dentry *dentry, |
621e155a | 287 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 288 | { |
621e155a | 289 | return isofs_dentry_cmp_common(len, str, name, 1, 1); |
1da177e4 LT |
290 | } |
291 | #endif | |
292 | ||
293 | enum { | |
294 | Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, | |
295 | Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, | |
296 | Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, | |
52b680c8 | 297 | Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, |
1da177e4 LT |
298 | }; |
299 | ||
a447c093 | 300 | static const match_table_t tokens = { |
1da177e4 LT |
301 | {Opt_norock, "norock"}, |
302 | {Opt_nojoliet, "nojoliet"}, | |
303 | {Opt_unhide, "unhide"}, | |
9769f4eb JW |
304 | {Opt_hide, "hide"}, |
305 | {Opt_showassoc, "showassoc"}, | |
1da177e4 LT |
306 | {Opt_cruft, "cruft"}, |
307 | {Opt_utf8, "utf8"}, | |
308 | {Opt_iocharset, "iocharset=%s"}, | |
309 | {Opt_map_a, "map=acorn"}, | |
310 | {Opt_map_a, "map=a"}, | |
311 | {Opt_map_n, "map=normal"}, | |
312 | {Opt_map_n, "map=n"}, | |
313 | {Opt_map_o, "map=off"}, | |
314 | {Opt_map_o, "map=o"}, | |
315 | {Opt_session, "session=%u"}, | |
316 | {Opt_sb, "sbsector=%u"}, | |
317 | {Opt_check_r, "check=relaxed"}, | |
318 | {Opt_check_r, "check=r"}, | |
319 | {Opt_check_s, "check=strict"}, | |
320 | {Opt_check_s, "check=s"}, | |
321 | {Opt_uid, "uid=%u"}, | |
322 | {Opt_gid, "gid=%u"}, | |
323 | {Opt_mode, "mode=%u"}, | |
9b7880e7 | 324 | {Opt_dmode, "dmode=%u"}, |
52b680c8 | 325 | {Opt_overriderockperm, "overriderockperm"}, |
1da177e4 LT |
326 | {Opt_block, "block=%u"}, |
327 | {Opt_ignore, "conv=binary"}, | |
328 | {Opt_ignore, "conv=b"}, | |
329 | {Opt_ignore, "conv=text"}, | |
330 | {Opt_ignore, "conv=t"}, | |
331 | {Opt_ignore, "conv=mtext"}, | |
332 | {Opt_ignore, "conv=m"}, | |
333 | {Opt_ignore, "conv=auto"}, | |
334 | {Opt_ignore, "conv=a"}, | |
335 | {Opt_nocompress, "nocompress"}, | |
336 | {Opt_err, NULL} | |
337 | }; | |
338 | ||
9eb7f2c6 | 339 | static int parse_options(char *options, struct iso9660_options *popt) |
1da177e4 LT |
340 | { |
341 | char *p; | |
342 | int option; | |
343 | ||
344 | popt->map = 'n'; | |
5404ac8e JK |
345 | popt->rock = 1; |
346 | popt->joliet = 1; | |
347 | popt->cruft = 0; | |
348 | popt->hide = 0; | |
349 | popt->showassoc = 0; | |
1da177e4 LT |
350 | popt->check = 'u'; /* unset */ |
351 | popt->nocompress = 0; | |
352 | popt->blocksize = 1024; | |
52b680c8 | 353 | popt->fmode = popt->dmode = ISOFS_INVALID_MODE; |
5c4a656b JK |
354 | popt->uid_set = 0; |
355 | popt->gid_set = 0; | |
ba64e2b9 EB |
356 | popt->gid = GLOBAL_ROOT_GID; |
357 | popt->uid = GLOBAL_ROOT_UID; | |
1da177e4 LT |
358 | popt->iocharset = NULL; |
359 | popt->utf8 = 0; | |
52b680c8 | 360 | popt->overriderockperm = 0; |
1da177e4 LT |
361 | popt->session=-1; |
362 | popt->sbsector=-1; | |
363 | if (!options) | |
364 | return 1; | |
365 | ||
366 | while ((p = strsep(&options, ",")) != NULL) { | |
367 | int token; | |
368 | substring_t args[MAX_OPT_ARGS]; | |
369 | unsigned n; | |
370 | ||
371 | if (!*p) | |
372 | continue; | |
373 | ||
374 | token = match_token(p, tokens, args); | |
375 | switch (token) { | |
376 | case Opt_norock: | |
5404ac8e | 377 | popt->rock = 0; |
1da177e4 LT |
378 | break; |
379 | case Opt_nojoliet: | |
5404ac8e | 380 | popt->joliet = 0; |
1da177e4 | 381 | break; |
9769f4eb | 382 | case Opt_hide: |
5404ac8e | 383 | popt->hide = 1; |
9769f4eb | 384 | break; |
1da177e4 | 385 | case Opt_unhide: |
9769f4eb | 386 | case Opt_showassoc: |
5404ac8e | 387 | popt->showassoc = 1; |
1da177e4 LT |
388 | break; |
389 | case Opt_cruft: | |
5404ac8e | 390 | popt->cruft = 1; |
1da177e4 LT |
391 | break; |
392 | case Opt_utf8: | |
393 | popt->utf8 = 1; | |
394 | break; | |
395 | #ifdef CONFIG_JOLIET | |
396 | case Opt_iocharset: | |
397 | popt->iocharset = match_strdup(&args[0]); | |
398 | break; | |
399 | #endif | |
400 | case Opt_map_a: | |
401 | popt->map = 'a'; | |
402 | break; | |
403 | case Opt_map_o: | |
404 | popt->map = 'o'; | |
405 | break; | |
406 | case Opt_map_n: | |
407 | popt->map = 'n'; | |
408 | break; | |
409 | case Opt_session: | |
410 | if (match_int(&args[0], &option)) | |
411 | return 0; | |
412 | n = option; | |
413 | if (n > 99) | |
414 | return 0; | |
415 | popt->session = n + 1; | |
416 | break; | |
417 | case Opt_sb: | |
418 | if (match_int(&args[0], &option)) | |
419 | return 0; | |
420 | popt->sbsector = option; | |
421 | break; | |
422 | case Opt_check_r: | |
423 | popt->check = 'r'; | |
424 | break; | |
425 | case Opt_check_s: | |
426 | popt->check = 's'; | |
427 | break; | |
428 | case Opt_ignore: | |
429 | break; | |
430 | case Opt_uid: | |
431 | if (match_int(&args[0], &option)) | |
432 | return 0; | |
ba64e2b9 EB |
433 | popt->uid = make_kuid(current_user_ns(), option); |
434 | if (!uid_valid(popt->uid)) | |
435 | return 0; | |
5c4a656b | 436 | popt->uid_set = 1; |
1da177e4 LT |
437 | break; |
438 | case Opt_gid: | |
439 | if (match_int(&args[0], &option)) | |
440 | return 0; | |
ba64e2b9 EB |
441 | popt->gid = make_kgid(current_user_ns(), option); |
442 | if (!gid_valid(popt->gid)) | |
443 | return 0; | |
5c4a656b | 444 | popt->gid_set = 1; |
1da177e4 LT |
445 | break; |
446 | case Opt_mode: | |
447 | if (match_int(&args[0], &option)) | |
448 | return 0; | |
9b7880e7 JK |
449 | popt->fmode = option; |
450 | break; | |
451 | case Opt_dmode: | |
452 | if (match_int(&args[0], &option)) | |
453 | return 0; | |
454 | popt->dmode = option; | |
1da177e4 | 455 | break; |
52b680c8 JK |
456 | case Opt_overriderockperm: |
457 | popt->overriderockperm = 1; | |
458 | break; | |
1da177e4 LT |
459 | case Opt_block: |
460 | if (match_int(&args[0], &option)) | |
461 | return 0; | |
462 | n = option; | |
463 | if (n != 512 && n != 1024 && n != 2048) | |
464 | return 0; | |
465 | popt->blocksize = n; | |
466 | break; | |
467 | case Opt_nocompress: | |
468 | popt->nocompress = 1; | |
469 | break; | |
470 | default: | |
471 | return 0; | |
472 | } | |
473 | } | |
474 | return 1; | |
475 | } | |
476 | ||
86a1da6d DH |
477 | /* |
478 | * Display the mount options in /proc/mounts. | |
479 | */ | |
480 | static int isofs_show_options(struct seq_file *m, struct dentry *root) | |
481 | { | |
482 | struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); | |
483 | ||
484 | if (!sbi->s_rock) seq_puts(m, ",norock"); | |
485 | else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); | |
486 | if (sbi->s_cruft) seq_puts(m, ",cruft"); | |
487 | if (sbi->s_hide) seq_puts(m, ",hide"); | |
488 | if (sbi->s_nocompress) seq_puts(m, ",nocompress"); | |
489 | if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); | |
490 | if (sbi->s_showassoc) seq_puts(m, ",showassoc"); | |
491 | if (sbi->s_utf8) seq_puts(m, ",utf8"); | |
492 | ||
493 | if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); | |
494 | if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); | |
fdb254db | 495 | if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); |
86a1da6d DH |
496 | if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); |
497 | ||
498 | if (root->d_sb->s_blocksize != 1024) | |
499 | seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); | |
500 | ||
501 | if (sbi->s_uid_set) | |
502 | seq_printf(m, ",uid=%u", | |
503 | from_kuid_munged(&init_user_ns, sbi->s_uid)); | |
504 | if (sbi->s_gid_set) | |
505 | seq_printf(m, ",gid=%u", | |
506 | from_kgid_munged(&init_user_ns, sbi->s_gid)); | |
507 | ||
508 | if (sbi->s_dmode != ISOFS_INVALID_MODE) | |
509 | seq_printf(m, ",dmode=%o", sbi->s_dmode); | |
510 | if (sbi->s_fmode != ISOFS_INVALID_MODE) | |
511 | seq_printf(m, ",fmode=%o", sbi->s_fmode); | |
512 | ||
513 | if (sbi->s_nls_iocharset && | |
514 | strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0) | |
515 | seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); | |
516 | return 0; | |
517 | } | |
518 | ||
1da177e4 LT |
519 | /* |
520 | * look if the driver can tell the multi session redirection value | |
521 | * | |
522 | * don't change this if you don't know what you do, please! | |
523 | * Multisession is legal only with XA disks. | |
524 | * A non-XA disk with more than one volume descriptor may do it right, but | |
525 | * usually is written in a nowhere standardized "multi-partition" manner. | |
526 | * Multisession uses absolute addressing (solely the first frame of the whole | |
527 | * track is #0), multi-partition uses relative addressing (each first frame of | |
528 | * each track is #0), and a track is not a session. | |
529 | * | |
530 | * A broken CDwriter software or drive firmware does not set new standards, | |
531 | * at least not if conflicting with the existing ones. | |
532 | * | |
533 | * emoenke@gwdg.de | |
534 | */ | |
535 | #define WE_OBEY_THE_WRITTEN_STANDARDS 1 | |
536 | ||
9eb7f2c6 | 537 | static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) |
1da177e4 LT |
538 | { |
539 | struct cdrom_multisession ms_info; | |
540 | unsigned int vol_desc_start; | |
541 | struct block_device *bdev = sb->s_bdev; | |
542 | int i; | |
543 | ||
544 | vol_desc_start=0; | |
545 | ms_info.addr_format=CDROM_LBA; | |
546 | if(session >= 0 && session <= 99) { | |
547 | struct cdrom_tocentry Te; | |
548 | Te.cdte_track=session; | |
549 | Te.cdte_format=CDROM_LBA; | |
550 | i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); | |
551 | if (!i) { | |
c3ed85a3 DJ |
552 | printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", |
553 | session, Te.cdte_addr.lba, | |
554 | Te.cdte_ctrl&CDROM_DATA_TRACK); | |
1da177e4 LT |
555 | if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) |
556 | return Te.cdte_addr.lba; | |
557 | } | |
c3ed85a3 DJ |
558 | |
559 | printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); | |
1da177e4 LT |
560 | } |
561 | i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); | |
9eb7f2c6 | 562 | if (session > 0) |
c3ed85a3 | 563 | printk(KERN_ERR "ISOFS: Invalid session number\n"); |
1da177e4 | 564 | #if 0 |
c3ed85a3 | 565 | printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); |
1da177e4 | 566 | if (i==0) { |
c3ed85a3 DJ |
567 | printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); |
568 | printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); | |
1da177e4 LT |
569 | } |
570 | #endif | |
571 | if (i==0) | |
572 | #if WE_OBEY_THE_WRITTEN_STANDARDS | |
c3ed85a3 | 573 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ |
1da177e4 | 574 | #endif |
c3ed85a3 | 575 | vol_desc_start=ms_info.addr.lba; |
1da177e4 LT |
576 | return vol_desc_start; |
577 | } | |
578 | ||
e45c9eff OZ |
579 | /* |
580 | * Check if root directory is empty (has less than 3 files). | |
581 | * | |
582 | * Used to detect broken CDs where ISO root directory is empty but Joliet root | |
583 | * directory is OK. If such CD has Rock Ridge extensions, they will be disabled | |
584 | * (and Joliet used instead) or else no files would be visible. | |
585 | */ | |
586 | static bool rootdir_empty(struct super_block *sb, unsigned long block) | |
587 | { | |
588 | int offset = 0, files = 0, de_len; | |
589 | struct iso_directory_record *de; | |
590 | struct buffer_head *bh; | |
591 | ||
592 | bh = sb_bread(sb, block); | |
593 | if (!bh) | |
594 | return true; | |
595 | while (files < 3) { | |
596 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
597 | de_len = *(unsigned char *) de; | |
598 | if (de_len == 0) | |
599 | break; | |
600 | files++; | |
601 | offset += de_len; | |
602 | } | |
603 | brelse(bh); | |
604 | return files < 3; | |
605 | } | |
606 | ||
1da177e4 LT |
607 | /* |
608 | * Initialize the superblock and read the root inode. | |
609 | * | |
610 | * Note: a check_disk_change() has been done immediately prior | |
611 | * to this call, so we don't need to check again. | |
612 | */ | |
613 | static int isofs_fill_super(struct super_block *s, void *data, int silent) | |
614 | { | |
c3ed85a3 DJ |
615 | struct buffer_head *bh = NULL, *pri_bh = NULL; |
616 | struct hs_primary_descriptor *h_pri = NULL; | |
617 | struct iso_primary_descriptor *pri = NULL; | |
1da177e4 | 618 | struct iso_supplementary_descriptor *sec = NULL; |
c3ed85a3 DJ |
619 | struct iso_directory_record *rootp; |
620 | struct inode *inode; | |
621 | struct iso9660_options opt; | |
622 | struct isofs_sb_info *sbi; | |
623 | unsigned long first_data_zone; | |
624 | int joliet_level = 0; | |
625 | int iso_blknum, block; | |
626 | int orig_zonesize; | |
c4386c83 | 627 | int table, error = -EINVAL; |
c3ed85a3 | 628 | unsigned int vol_desc_start; |
1da177e4 | 629 | |
f8314dc6 | 630 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
4f819a78 | 631 | if (!sbi) |
1da177e4 LT |
632 | return -ENOMEM; |
633 | s->s_fs_info = sbi; | |
1da177e4 | 634 | |
9eb7f2c6 | 635 | if (!parse_options((char *)data, &opt)) |
1da177e4 LT |
636 | goto out_freesbi; |
637 | ||
638 | /* | |
639 | * First of all, get the hardware blocksize for this device. | |
640 | * If we don't know what it is, or the hardware blocksize is | |
641 | * larger than the blocksize the user specified, then use | |
642 | * that value. | |
643 | */ | |
644 | /* | |
645 | * What if bugger tells us to go beyond page size? | |
646 | */ | |
647 | opt.blocksize = sb_min_blocksize(s, opt.blocksize); | |
648 | ||
649 | sbi->s_high_sierra = 0; /* default is iso9660 */ | |
86a1da6d DH |
650 | sbi->s_session = opt.session; |
651 | sbi->s_sbsector = opt.sbsector; | |
1da177e4 LT |
652 | |
653 | vol_desc_start = (opt.sbsector != -1) ? | |
654 | opt.sbsector : isofs_get_last_session(s,opt.session); | |
655 | ||
c3ed85a3 DJ |
656 | for (iso_blknum = vol_desc_start+16; |
657 | iso_blknum < vol_desc_start+100; iso_blknum++) { | |
658 | struct hs_volume_descriptor *hdp; | |
659 | struct iso_volume_descriptor *vdp; | |
660 | ||
661 | block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); | |
662 | if (!(bh = sb_bread(s, block))) | |
663 | goto out_no_read; | |
664 | ||
665 | vdp = (struct iso_volume_descriptor *)bh->b_data; | |
666 | hdp = (struct hs_volume_descriptor *)bh->b_data; | |
667 | ||
668 | /* | |
669 | * Due to the overlapping physical location of the descriptors, | |
670 | * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure | |
671 | * proper identification in this case, we first check for ISO. | |
672 | */ | |
673 | if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { | |
674 | if (isonum_711(vdp->type) == ISO_VD_END) | |
675 | break; | |
676 | if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { | |
677 | if (pri == NULL) { | |
678 | pri = (struct iso_primary_descriptor *)vdp; | |
679 | /* Save the buffer in case we need it ... */ | |
680 | pri_bh = bh; | |
681 | bh = NULL; | |
682 | } | |
683 | } | |
1da177e4 | 684 | #ifdef CONFIG_JOLIET |
c3ed85a3 DJ |
685 | else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { |
686 | sec = (struct iso_supplementary_descriptor *)vdp; | |
687 | if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { | |
8711c67b | 688 | if (opt.joliet) { |
c3ed85a3 DJ |
689 | if (sec->escape[2] == 0x40) |
690 | joliet_level = 1; | |
691 | else if (sec->escape[2] == 0x43) | |
692 | joliet_level = 2; | |
693 | else if (sec->escape[2] == 0x45) | |
694 | joliet_level = 3; | |
695 | ||
696 | printk(KERN_DEBUG "ISO 9660 Extensions: " | |
697 | "Microsoft Joliet Level %d\n", | |
698 | joliet_level); | |
699 | } | |
700 | goto root_found; | |
701 | } else { | |
702 | /* Unknown supplementary volume descriptor */ | |
703 | sec = NULL; | |
704 | } | |
1da177e4 | 705 | } |
1da177e4 | 706 | #endif |
c3ed85a3 DJ |
707 | } else { |
708 | if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { | |
709 | if (isonum_711(hdp->type) != ISO_VD_PRIMARY) | |
710 | goto out_freebh; | |
711 | ||
712 | sbi->s_high_sierra = 1; | |
5404ac8e | 713 | opt.rock = 0; |
c3ed85a3 DJ |
714 | h_pri = (struct hs_primary_descriptor *)vdp; |
715 | goto root_found; | |
716 | } | |
1da177e4 | 717 | } |
1da177e4 | 718 | |
c3ed85a3 | 719 | /* Just skip any volume descriptors we don't recognize */ |
1da177e4 | 720 | |
c3ed85a3 DJ |
721 | brelse(bh); |
722 | bh = NULL; | |
1da177e4 LT |
723 | } |
724 | /* | |
725 | * If we fall through, either no volume descriptor was found, | |
726 | * or else we passed a primary descriptor looking for others. | |
727 | */ | |
728 | if (!pri) | |
729 | goto out_unknown_format; | |
730 | brelse(bh); | |
731 | bh = pri_bh; | |
732 | pri_bh = NULL; | |
733 | ||
734 | root_found: | |
a2ed0b39 | 735 | /* We don't support read-write mounts */ |
bc98a42c | 736 | if (!sb_rdonly(s)) { |
a2ed0b39 JK |
737 | error = -EACCES; |
738 | goto out_freebh; | |
739 | } | |
1da177e4 | 740 | |
5404ac8e | 741 | if (joliet_level && (pri == NULL || !opt.rock)) { |
c3ed85a3 DJ |
742 | /* This is the case of Joliet with the norock mount flag. |
743 | * A disc with both Joliet and Rock Ridge is handled later | |
744 | */ | |
745 | pri = (struct iso_primary_descriptor *) sec; | |
1da177e4 LT |
746 | } |
747 | ||
748 | if(sbi->s_high_sierra){ | |
c3ed85a3 DJ |
749 | rootp = (struct iso_directory_record *) h_pri->root_directory_record; |
750 | sbi->s_nzones = isonum_733(h_pri->volume_space_size); | |
751 | sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); | |
752 | sbi->s_max_size = isonum_733(h_pri->volume_space_size); | |
1da177e4 | 753 | } else { |
c3ed85a3 DJ |
754 | if (!pri) |
755 | goto out_freebh; | |
756 | rootp = (struct iso_directory_record *) pri->root_directory_record; | |
757 | sbi->s_nzones = isonum_733(pri->volume_space_size); | |
758 | sbi->s_log_zone_size = isonum_723(pri->logical_block_size); | |
759 | sbi->s_max_size = isonum_733(pri->volume_space_size); | |
1da177e4 LT |
760 | } |
761 | ||
762 | sbi->s_ninodes = 0; /* No way to figure this out easily */ | |
763 | ||
764 | orig_zonesize = sbi->s_log_zone_size; | |
765 | /* | |
766 | * If the zone size is smaller than the hardware sector size, | |
767 | * this is a fatal error. This would occur if the disc drive | |
768 | * had sectors that were 2048 bytes, but the filesystem had | |
769 | * blocks that were 512 bytes (which should only very rarely | |
770 | * happen.) | |
771 | */ | |
c3ed85a3 | 772 | if (orig_zonesize < opt.blocksize) |
1da177e4 LT |
773 | goto out_bad_size; |
774 | ||
775 | /* RDE: convert log zone size to bit shift */ | |
c3ed85a3 DJ |
776 | switch (sbi->s_log_zone_size) { |
777 | case 512: sbi->s_log_zone_size = 9; break; | |
778 | case 1024: sbi->s_log_zone_size = 10; break; | |
779 | case 2048: sbi->s_log_zone_size = 11; break; | |
1da177e4 | 780 | |
c3ed85a3 | 781 | default: |
1da177e4 | 782 | goto out_bad_zone_size; |
c3ed85a3 | 783 | } |
1da177e4 LT |
784 | |
785 | s->s_magic = ISOFS_SUPER_MAGIC; | |
66a362a2 JA |
786 | |
787 | /* | |
788 | * With multi-extent files, file size is only limited by the maximum | |
789 | * size of a file system, which is 8 TB. | |
790 | */ | |
791 | s->s_maxbytes = 0x80000000000LL; | |
1da177e4 | 792 | |
1da177e4 LT |
793 | /* Set this for reference. Its not currently used except on write |
794 | which we don't have .. */ | |
c3ed85a3 DJ |
795 | |
796 | first_data_zone = isonum_733(rootp->extent) + | |
797 | isonum_711(rootp->ext_attr_length); | |
1da177e4 LT |
798 | sbi->s_firstdatazone = first_data_zone; |
799 | #ifndef BEQUIET | |
c3ed85a3 DJ |
800 | printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", |
801 | sbi->s_max_size, 1UL << sbi->s_log_zone_size); | |
802 | printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); | |
1da177e4 | 803 | if(sbi->s_high_sierra) |
c3ed85a3 | 804 | printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); |
1da177e4 LT |
805 | #endif |
806 | ||
807 | /* | |
808 | * If the Joliet level is set, we _may_ decide to use the | |
809 | * secondary descriptor, but can't be sure until after we | |
810 | * read the root inode. But before reading the root inode | |
811 | * we may need to change the device blocksize, and would | |
812 | * rather release the old buffer first. So, we cache the | |
813 | * first_data_zone value from the secondary descriptor. | |
814 | */ | |
815 | if (joliet_level) { | |
816 | pri = (struct iso_primary_descriptor *) sec; | |
817 | rootp = (struct iso_directory_record *) | |
818 | pri->root_directory_record; | |
c3ed85a3 DJ |
819 | first_data_zone = isonum_733(rootp->extent) + |
820 | isonum_711(rootp->ext_attr_length); | |
1da177e4 LT |
821 | } |
822 | ||
823 | /* | |
824 | * We're all done using the volume descriptor, and may need | |
825 | * to change the device blocksize, so release the buffer now. | |
826 | */ | |
827 | brelse(pri_bh); | |
828 | brelse(bh); | |
829 | ||
830 | /* | |
831 | * Force the blocksize to 512 for 512 byte sectors. The file | |
832 | * read primitives really get it wrong in a bad way if we don't | |
833 | * do this. | |
834 | * | |
835 | * Note - we should never be setting the blocksize to something | |
836 | * less than the hardware sector size for the device. If we | |
837 | * do, we would end up having to read larger buffers and split | |
838 | * out portions to satisfy requests. | |
839 | * | |
840 | * Note2- the idea here is that we want to deal with the optimal | |
841 | * zonesize in the filesystem. If we have it set to something less, | |
842 | * then we have horrible problems with trying to piece together | |
843 | * bits of adjacent blocks in order to properly read directory | |
844 | * entries. By forcing the blocksize in this way, we ensure | |
845 | * that we will never be required to do this. | |
846 | */ | |
847 | sb_set_blocksize(s, orig_zonesize); | |
848 | ||
849 | sbi->s_nls_iocharset = NULL; | |
850 | ||
851 | #ifdef CONFIG_JOLIET | |
852 | if (joliet_level && opt.utf8 == 0) { | |
c3ed85a3 | 853 | char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; |
1da177e4 LT |
854 | sbi->s_nls_iocharset = load_nls(p); |
855 | if (! sbi->s_nls_iocharset) { | |
856 | /* Fail only if explicit charset specified */ | |
857 | if (opt.iocharset) | |
858 | goto out_freesbi; | |
859 | sbi->s_nls_iocharset = load_nls_default(); | |
860 | } | |
861 | } | |
862 | #endif | |
863 | s->s_op = &isofs_sops; | |
864 | s->s_export_op = &isofs_export_ops; | |
865 | sbi->s_mapping = opt.map; | |
5404ac8e | 866 | sbi->s_rock = (opt.rock ? 2 : 0); |
1da177e4 LT |
867 | sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ |
868 | sbi->s_cruft = opt.cruft; | |
9769f4eb JW |
869 | sbi->s_hide = opt.hide; |
870 | sbi->s_showassoc = opt.showassoc; | |
1da177e4 LT |
871 | sbi->s_uid = opt.uid; |
872 | sbi->s_gid = opt.gid; | |
5c4a656b JK |
873 | sbi->s_uid_set = opt.uid_set; |
874 | sbi->s_gid_set = opt.gid_set; | |
1da177e4 LT |
875 | sbi->s_utf8 = opt.utf8; |
876 | sbi->s_nocompress = opt.nocompress; | |
52b680c8 | 877 | sbi->s_overriderockperm = opt.overriderockperm; |
1da177e4 LT |
878 | /* |
879 | * It would be incredibly stupid to allow people to mark every file | |
880 | * on the disk as suid, so we merely allow them to set the default | |
881 | * permissions. | |
882 | */ | |
52b680c8 JK |
883 | if (opt.fmode != ISOFS_INVALID_MODE) |
884 | sbi->s_fmode = opt.fmode & 0777; | |
885 | else | |
886 | sbi->s_fmode = ISOFS_INVALID_MODE; | |
887 | if (opt.dmode != ISOFS_INVALID_MODE) | |
888 | sbi->s_dmode = opt.dmode & 0777; | |
889 | else | |
890 | sbi->s_dmode = ISOFS_INVALID_MODE; | |
1da177e4 LT |
891 | |
892 | /* | |
893 | * Read the root inode, which _may_ result in changing | |
894 | * the s_rock flag. Once we have the final s_rock value, | |
895 | * we then decide whether to use the Joliet descriptor. | |
896 | */ | |
897 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
c4386c83 DH |
898 | if (IS_ERR(inode)) |
899 | goto out_no_root; | |
1da177e4 | 900 | |
e45c9eff OZ |
901 | /* |
902 | * Fix for broken CDs with Rock Ridge and empty ISO root directory but | |
903 | * correct Joliet root directory. | |
904 | */ | |
905 | if (sbi->s_rock == 1 && joliet_level && | |
906 | rootdir_empty(s, sbi->s_firstdatazone)) { | |
907 | printk(KERN_NOTICE | |
908 | "ISOFS: primary root directory is empty. " | |
909 | "Disabling Rock Ridge and switching to Joliet."); | |
910 | sbi->s_rock = 0; | |
911 | } | |
912 | ||
1da177e4 LT |
913 | /* |
914 | * If this disk has both Rock Ridge and Joliet on it, then we | |
915 | * want to use Rock Ridge by default. This can be overridden | |
916 | * by using the norock mount option. There is still one other | |
917 | * possibility that is not taken into account: a Rock Ridge | |
918 | * CD with Unicode names. Until someone sees such a beast, it | |
919 | * will not be supported. | |
920 | */ | |
921 | if (sbi->s_rock == 1) { | |
922 | joliet_level = 0; | |
923 | } else if (joliet_level) { | |
924 | sbi->s_rock = 0; | |
925 | if (sbi->s_firstdatazone != first_data_zone) { | |
926 | sbi->s_firstdatazone = first_data_zone; | |
c3ed85a3 | 927 | printk(KERN_DEBUG |
1da177e4 LT |
928 | "ISOFS: changing to secondary root\n"); |
929 | iput(inode); | |
930 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
c4386c83 DH |
931 | if (IS_ERR(inode)) |
932 | goto out_no_root; | |
1da177e4 LT |
933 | } |
934 | } | |
935 | ||
936 | if (opt.check == 'u') { | |
937 | /* Only Joliet is case insensitive by default */ | |
c3ed85a3 DJ |
938 | if (joliet_level) |
939 | opt.check = 'r'; | |
940 | else | |
941 | opt.check = 's'; | |
1da177e4 LT |
942 | } |
943 | sbi->s_joliet_level = joliet_level; | |
944 | ||
817794e0 KK |
945 | /* Make sure the root inode is a directory */ |
946 | if (!S_ISDIR(inode->i_mode)) { | |
947 | printk(KERN_WARNING | |
948 | "isofs_fill_super: root inode is not a directory. " | |
949 | "Corrupted media?\n"); | |
950 | goto out_iput; | |
951 | } | |
952 | ||
1da177e4 | 953 | table = 0; |
c3ed85a3 DJ |
954 | if (joliet_level) |
955 | table += 2; | |
956 | if (opt.check == 'r') | |
957 | table++; | |
86a1da6d | 958 | sbi->s_check = opt.check; |
6cc9c1d2 | 959 | |
b0afd8e5 AV |
960 | if (table) |
961 | s->s_d_op = &isofs_dentry_ops[table - 1]; | |
6cc9c1d2 AV |
962 | |
963 | /* get the root dentry */ | |
48fde701 | 964 | s->s_root = d_make_root(inode); |
8fdd8c49 | 965 | if (!(s->s_root)) { |
8fdd8c49 AV |
966 | error = -ENOMEM; |
967 | goto out_no_inode; | |
968 | } | |
1da177e4 | 969 | |
f99d49ad | 970 | kfree(opt.iocharset); |
1da177e4 LT |
971 | |
972 | return 0; | |
973 | ||
974 | /* | |
975 | * Display error messages and free resources. | |
976 | */ | |
1da177e4 LT |
977 | out_iput: |
978 | iput(inode); | |
c4386c83 DH |
979 | goto out_no_inode; |
980 | out_no_root: | |
981 | error = PTR_ERR(inode); | |
982 | if (error != -ENOMEM) | |
983 | printk(KERN_WARNING "%s: get root inode failed\n", __func__); | |
984 | out_no_inode: | |
1da177e4 | 985 | #ifdef CONFIG_JOLIET |
6d729e44 | 986 | unload_nls(sbi->s_nls_iocharset); |
1da177e4 LT |
987 | #endif |
988 | goto out_freesbi; | |
989 | out_no_read: | |
c3ed85a3 DJ |
990 | printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", |
991 | __func__, s->s_id, iso_blknum, block); | |
c11760c6 | 992 | goto out_freebh; |
1da177e4 | 993 | out_bad_zone_size: |
c3ed85a3 | 994 | printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", |
1da177e4 LT |
995 | sbi->s_log_zone_size); |
996 | goto out_freebh; | |
997 | out_bad_size: | |
c3ed85a3 | 998 | printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", |
1da177e4 LT |
999 | orig_zonesize, opt.blocksize); |
1000 | goto out_freebh; | |
1001 | out_unknown_format: | |
1002 | if (!silent) | |
c3ed85a3 | 1003 | printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); |
1da177e4 LT |
1004 | |
1005 | out_freebh: | |
1006 | brelse(bh); | |
c11760c6 | 1007 | brelse(pri_bh); |
1da177e4 | 1008 | out_freesbi: |
f99d49ad | 1009 | kfree(opt.iocharset); |
1da177e4 LT |
1010 | kfree(sbi); |
1011 | s->s_fs_info = NULL; | |
c4386c83 | 1012 | return error; |
1da177e4 LT |
1013 | } |
1014 | ||
726c3342 | 1015 | static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 1016 | { |
726c3342 | 1017 | struct super_block *sb = dentry->d_sb; |
2430c4da | 1018 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
726c3342 | 1019 | |
1da177e4 LT |
1020 | buf->f_type = ISOFS_SUPER_MAGIC; |
1021 | buf->f_bsize = sb->s_blocksize; | |
1022 | buf->f_blocks = (ISOFS_SB(sb)->s_nzones | |
c3ed85a3 | 1023 | << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); |
1da177e4 LT |
1024 | buf->f_bfree = 0; |
1025 | buf->f_bavail = 0; | |
1026 | buf->f_files = ISOFS_SB(sb)->s_ninodes; | |
1027 | buf->f_ffree = 0; | |
2430c4da CL |
1028 | buf->f_fsid.val[0] = (u32)id; |
1029 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
1030 | buf->f_namelen = NAME_MAX; |
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * Get a set of blocks; filling in buffer_heads if already allocated | |
1036 | * or getblk() if they are not. Returns the number of blocks inserted | |
c4386c83 | 1037 | * (-ve == error.) |
1da177e4 | 1038 | */ |
fde214d4 | 1039 | int isofs_get_blocks(struct inode *inode, sector_t iblock, |
1da177e4 LT |
1040 | struct buffer_head **bh, unsigned long nblocks) |
1041 | { | |
fde214d4 | 1042 | unsigned long b_off = iblock; |
1da177e4 LT |
1043 | unsigned offset, sect_size; |
1044 | unsigned int firstext; | |
1045 | unsigned long nextblk, nextoff; | |
c4386c83 | 1046 | int section, rv, error; |
1da177e4 LT |
1047 | struct iso_inode_info *ei = ISOFS_I(inode); |
1048 | ||
c4386c83 | 1049 | error = -EIO; |
1da177e4 | 1050 | rv = 0; |
fde214d4 | 1051 | if (iblock != b_off) { |
c3ed85a3 | 1052 | printk(KERN_DEBUG "%s: block number too large\n", __func__); |
1da177e4 LT |
1053 | goto abort; |
1054 | } | |
1055 | ||
c3ed85a3 DJ |
1056 | |
1057 | offset = 0; | |
1058 | firstext = ei->i_first_extent; | |
1da177e4 | 1059 | sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); |
c3ed85a3 DJ |
1060 | nextblk = ei->i_next_section_block; |
1061 | nextoff = ei->i_next_section_offset; | |
1062 | section = 0; | |
1da177e4 | 1063 | |
c3ed85a3 | 1064 | while (nblocks) { |
1da177e4 LT |
1065 | /* If we are *way* beyond the end of the file, print a message. |
1066 | * Access beyond the end of the file up to the next page boundary | |
1067 | * is normal, however because of the way the page cache works. | |
1068 | * In this case, we just return 0 so that we can properly fill | |
1069 | * the page with useless information without generating any | |
1070 | * I/O errors. | |
1071 | */ | |
09cbfeaf | 1072 | if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { |
fde214d4 JK |
1073 | printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", |
1074 | __func__, b_off, | |
1075 | (unsigned long long)inode->i_size); | |
1da177e4 LT |
1076 | goto abort; |
1077 | } | |
c3ed85a3 | 1078 | |
fb50ae74 JRV |
1079 | /* On the last section, nextblk == 0, section size is likely to |
1080 | * exceed sect_size by a partial block, and access beyond the | |
1081 | * end of the file will reach beyond the section size, too. | |
1082 | */ | |
1083 | while (nextblk && (b_off >= (offset + sect_size))) { | |
1084 | struct inode *ninode; | |
1085 | ||
1086 | offset += sect_size; | |
1087 | ninode = isofs_iget(inode->i_sb, nextblk, nextoff); | |
c4386c83 DH |
1088 | if (IS_ERR(ninode)) { |
1089 | error = PTR_ERR(ninode); | |
fb50ae74 | 1090 | goto abort; |
c4386c83 | 1091 | } |
fb50ae74 JRV |
1092 | firstext = ISOFS_I(ninode)->i_first_extent; |
1093 | sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); | |
1094 | nextblk = ISOFS_I(ninode)->i_next_section_block; | |
1095 | nextoff = ISOFS_I(ninode)->i_next_section_offset; | |
1096 | iput(ninode); | |
1097 | ||
1098 | if (++section > 100) { | |
c3ed85a3 DJ |
1099 | printk(KERN_DEBUG "%s: More than 100 file sections ?!?" |
1100 | " aborting...\n", __func__); | |
fde214d4 | 1101 | printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " |
c3ed85a3 | 1102 | "nextblk=%lu nextoff=%lu\n", __func__, |
fde214d4 | 1103 | b_off, firstext, (unsigned) sect_size, |
c3ed85a3 | 1104 | nextblk, nextoff); |
fb50ae74 | 1105 | goto abort; |
1da177e4 LT |
1106 | } |
1107 | } | |
c3ed85a3 DJ |
1108 | |
1109 | if (*bh) { | |
1da177e4 LT |
1110 | map_bh(*bh, inode->i_sb, firstext + b_off - offset); |
1111 | } else { | |
1112 | *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); | |
c3ed85a3 | 1113 | if (!*bh) |
1da177e4 LT |
1114 | goto abort; |
1115 | } | |
1116 | bh++; /* Next buffer head */ | |
1117 | b_off++; /* Next buffer offset */ | |
1118 | nblocks--; | |
1119 | rv++; | |
1120 | } | |
1121 | ||
c4386c83 | 1122 | error = 0; |
1da177e4 | 1123 | abort: |
c4386c83 | 1124 | return rv != 0 ? rv : error; |
1da177e4 LT |
1125 | } |
1126 | ||
1127 | /* | |
1128 | * Used by the standard interfaces. | |
1129 | */ | |
1130 | static int isofs_get_block(struct inode *inode, sector_t iblock, | |
1131 | struct buffer_head *bh_result, int create) | |
1132 | { | |
c4386c83 DH |
1133 | int ret; |
1134 | ||
9eb7f2c6 | 1135 | if (create) { |
c3ed85a3 | 1136 | printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); |
1da177e4 LT |
1137 | return -EROFS; |
1138 | } | |
1139 | ||
c4386c83 DH |
1140 | ret = isofs_get_blocks(inode, iblock, &bh_result, 1); |
1141 | return ret < 0 ? ret : 0; | |
1da177e4 LT |
1142 | } |
1143 | ||
1144 | static int isofs_bmap(struct inode *inode, sector_t block) | |
1145 | { | |
1146 | struct buffer_head dummy; | |
1147 | int error; | |
1148 | ||
1149 | dummy.b_state = 0; | |
1150 | dummy.b_blocknr = -1000; | |
1151 | error = isofs_get_block(inode, block, &dummy, 0); | |
1152 | if (!error) | |
1153 | return dummy.b_blocknr; | |
1154 | return 0; | |
1155 | } | |
1156 | ||
1157 | struct buffer_head *isofs_bread(struct inode *inode, sector_t block) | |
1158 | { | |
1159 | sector_t blknr = isofs_bmap(inode, block); | |
1160 | if (!blknr) | |
1161 | return NULL; | |
1162 | return sb_bread(inode->i_sb, blknr); | |
1163 | } | |
1164 | ||
1165 | static int isofs_readpage(struct file *file, struct page *page) | |
1166 | { | |
3069083c NJ |
1167 | return mpage_readpage(page, isofs_get_block); |
1168 | } | |
1169 | ||
1170 | static int isofs_readpages(struct file *file, struct address_space *mapping, | |
1171 | struct list_head *pages, unsigned nr_pages) | |
1172 | { | |
1173 | return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); | |
1da177e4 LT |
1174 | } |
1175 | ||
1176 | static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) | |
1177 | { | |
1178 | return generic_block_bmap(mapping,block,isofs_get_block); | |
1179 | } | |
1180 | ||
f5e54d6e | 1181 | static const struct address_space_operations isofs_aops = { |
1da177e4 | 1182 | .readpage = isofs_readpage, |
3069083c | 1183 | .readpages = isofs_readpages, |
1da177e4 LT |
1184 | .bmap = _isofs_bmap |
1185 | }; | |
1186 | ||
9eb7f2c6 | 1187 | static int isofs_read_level3_size(struct inode *inode) |
1da177e4 LT |
1188 | { |
1189 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1190 | int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; | |
c3ed85a3 | 1191 | struct buffer_head *bh = NULL; |
1da177e4 LT |
1192 | unsigned long block, offset, block_saved, offset_saved; |
1193 | int i = 0; | |
1194 | int more_entries = 0; | |
c3ed85a3 | 1195 | struct iso_directory_record *tmpde = NULL; |
1da177e4 LT |
1196 | struct iso_inode_info *ei = ISOFS_I(inode); |
1197 | ||
1198 | inode->i_size = 0; | |
1199 | ||
1200 | /* The first 16 blocks are reserved as the System Area. Thus, | |
1201 | * no inodes can appear in block 0. We use this to flag that | |
1202 | * this is the last section. */ | |
1203 | ei->i_next_section_block = 0; | |
1204 | ei->i_next_section_offset = 0; | |
1205 | ||
1206 | block = ei->i_iget5_block; | |
1207 | offset = ei->i_iget5_offset; | |
1208 | ||
1209 | do { | |
c3ed85a3 | 1210 | struct iso_directory_record *de; |
1da177e4 LT |
1211 | unsigned int de_len; |
1212 | ||
1213 | if (!bh) { | |
1214 | bh = sb_bread(inode->i_sb, block); | |
1215 | if (!bh) | |
1216 | goto out_noread; | |
1217 | } | |
1218 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1219 | de_len = *(unsigned char *) de; | |
1220 | ||
1221 | if (de_len == 0) { | |
1222 | brelse(bh); | |
1223 | bh = NULL; | |
1224 | ++block; | |
1225 | offset = 0; | |
1226 | continue; | |
1227 | } | |
1228 | ||
1229 | block_saved = block; | |
1230 | offset_saved = offset; | |
1231 | offset += de_len; | |
1232 | ||
1233 | /* Make sure we have a full directory entry */ | |
1234 | if (offset >= bufsize) { | |
1235 | int slop = bufsize - offset + de_len; | |
1236 | if (!tmpde) { | |
1237 | tmpde = kmalloc(256, GFP_KERNEL); | |
1238 | if (!tmpde) | |
1239 | goto out_nomem; | |
1240 | } | |
1241 | memcpy(tmpde, de, slop); | |
1242 | offset &= bufsize - 1; | |
1243 | block++; | |
1244 | brelse(bh); | |
1245 | bh = NULL; | |
1246 | if (offset) { | |
1247 | bh = sb_bread(inode->i_sb, block); | |
1248 | if (!bh) | |
1249 | goto out_noread; | |
9eb7f2c6 | 1250 | memcpy((void *)tmpde+slop, bh->b_data, offset); |
1da177e4 LT |
1251 | } |
1252 | de = tmpde; | |
1253 | } | |
1254 | ||
1255 | inode->i_size += isonum_733(de->size); | |
1256 | if (i == 1) { | |
1257 | ei->i_next_section_block = block_saved; | |
1258 | ei->i_next_section_offset = offset_saved; | |
1259 | } | |
1260 | ||
1261 | more_entries = de->flags[-high_sierra] & 0x80; | |
1262 | ||
1263 | i++; | |
9eb7f2c6 | 1264 | if (i > 100) |
1da177e4 | 1265 | goto out_toomany; |
9eb7f2c6 | 1266 | } while (more_entries); |
1da177e4 | 1267 | out: |
9eb7f2c6 | 1268 | kfree(tmpde); |
1da177e4 LT |
1269 | if (bh) |
1270 | brelse(bh); | |
1271 | return 0; | |
1272 | ||
1273 | out_nomem: | |
1274 | if (bh) | |
1275 | brelse(bh); | |
1276 | return -ENOMEM; | |
1277 | ||
1278 | out_noread: | |
1279 | printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); | |
f99d49ad | 1280 | kfree(tmpde); |
1da177e4 LT |
1281 | return -EIO; |
1282 | ||
1283 | out_toomany: | |
c3ed85a3 DJ |
1284 | printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" |
1285 | "isofs_read_level3_size: inode=%lu\n", | |
1286 | __func__, inode->i_ino); | |
1da177e4 LT |
1287 | goto out; |
1288 | } | |
1289 | ||
410dd3cf | 1290 | static int isofs_read_inode(struct inode *inode, int relocated) |
1da177e4 LT |
1291 | { |
1292 | struct super_block *sb = inode->i_sb; | |
1293 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
1294 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1295 | unsigned long block; | |
1296 | int high_sierra = sbi->s_high_sierra; | |
c3ed85a3 DJ |
1297 | struct buffer_head *bh = NULL; |
1298 | struct iso_directory_record *de; | |
1299 | struct iso_directory_record *tmpde = NULL; | |
1da177e4 LT |
1300 | unsigned int de_len; |
1301 | unsigned long offset; | |
1302 | struct iso_inode_info *ei = ISOFS_I(inode); | |
c4386c83 | 1303 | int ret = -EIO; |
1da177e4 LT |
1304 | |
1305 | block = ei->i_iget5_block; | |
1306 | bh = sb_bread(inode->i_sb, block); | |
1307 | if (!bh) | |
1308 | goto out_badread; | |
1309 | ||
1310 | offset = ei->i_iget5_offset; | |
1311 | ||
1312 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1313 | de_len = *(unsigned char *) de; | |
1314 | ||
1315 | if (offset + de_len > bufsize) { | |
1316 | int frag1 = bufsize - offset; | |
1317 | ||
1318 | tmpde = kmalloc(de_len, GFP_KERNEL); | |
1319 | if (tmpde == NULL) { | |
c3ed85a3 | 1320 | printk(KERN_INFO "%s: out of memory\n", __func__); |
c4386c83 | 1321 | ret = -ENOMEM; |
1da177e4 LT |
1322 | goto fail; |
1323 | } | |
1324 | memcpy(tmpde, bh->b_data + offset, frag1); | |
1325 | brelse(bh); | |
1326 | bh = sb_bread(inode->i_sb, ++block); | |
1327 | if (!bh) | |
1328 | goto out_badread; | |
1329 | memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); | |
1330 | de = tmpde; | |
1331 | } | |
1332 | ||
1333 | inode->i_ino = isofs_get_ino(ei->i_iget5_block, | |
c3ed85a3 DJ |
1334 | ei->i_iget5_offset, |
1335 | ISOFS_BUFFER_BITS(inode)); | |
1da177e4 LT |
1336 | |
1337 | /* Assume it is a normal-format file unless told otherwise */ | |
1338 | ei->i_file_format = isofs_file_normal; | |
1339 | ||
1340 | if (de->flags[-high_sierra] & 2) { | |
52b680c8 JK |
1341 | if (sbi->s_dmode != ISOFS_INVALID_MODE) |
1342 | inode->i_mode = S_IFDIR | sbi->s_dmode; | |
1343 | else | |
1344 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
bfe86848 | 1345 | set_nlink(inode, 1); /* |
c3ed85a3 DJ |
1346 | * Set to 1. We know there are 2, but |
1347 | * the find utility tries to optimize | |
1348 | * if it is 2, and it screws up. It is | |
1349 | * easier to give 1 which tells find to | |
1350 | * do it the hard way. | |
1351 | */ | |
1da177e4 | 1352 | } else { |
52b680c8 JK |
1353 | if (sbi->s_fmode != ISOFS_INVALID_MODE) { |
1354 | inode->i_mode = S_IFREG | sbi->s_fmode; | |
1355 | } else { | |
1356 | /* | |
1357 | * Set default permissions: r-x for all. The disc | |
1358 | * could be shared with DOS machines so virtually | |
1359 | * anything could be a valid executable. | |
1360 | */ | |
1361 | inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; | |
1362 | } | |
bfe86848 | 1363 | set_nlink(inode, 1); |
1da177e4 LT |
1364 | } |
1365 | inode->i_uid = sbi->s_uid; | |
1366 | inode->i_gid = sbi->s_gid; | |
ba52de12 | 1367 | inode->i_blocks = 0; |
1da177e4 LT |
1368 | |
1369 | ei->i_format_parm[0] = 0; | |
1370 | ei->i_format_parm[1] = 0; | |
1371 | ei->i_format_parm[2] = 0; | |
1372 | ||
c3ed85a3 | 1373 | ei->i_section_size = isonum_733(de->size); |
9eb7f2c6 | 1374 | if (de->flags[-high_sierra] & 0x80) { |
c4386c83 DH |
1375 | ret = isofs_read_level3_size(inode); |
1376 | if (ret < 0) | |
c3ed85a3 | 1377 | goto fail; |
c4386c83 | 1378 | ret = -EIO; |
1da177e4 LT |
1379 | } else { |
1380 | ei->i_next_section_block = 0; | |
1381 | ei->i_next_section_offset = 0; | |
c3ed85a3 | 1382 | inode->i_size = isonum_733(de->size); |
1da177e4 LT |
1383 | } |
1384 | ||
1385 | /* | |
1386 | * Some dipshit decided to store some other bit of information | |
1387 | * in the high byte of the file length. Truncate size in case | |
1388 | * this CDROM was mounted with the cruft option. | |
1389 | */ | |
1390 | ||
5404ac8e | 1391 | if (sbi->s_cruft) |
1da177e4 LT |
1392 | inode->i_size &= 0x00ffffff; |
1393 | ||
1394 | if (de->interleave[0]) { | |
c3ed85a3 | 1395 | printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); |
1da177e4 LT |
1396 | inode->i_size = 0; |
1397 | } | |
1398 | ||
1399 | /* I have no idea what file_unit_size is used for, so | |
1400 | we will flag it for now */ | |
1401 | if (de->file_unit_size[0] != 0) { | |
c3ed85a3 DJ |
1402 | printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", |
1403 | inode->i_ino); | |
1da177e4 LT |
1404 | } |
1405 | ||
1406 | /* I have no idea what other flag bits are used for, so | |
1407 | we will flag it for now */ | |
1408 | #ifdef DEBUG | |
1409 | if((de->flags[-high_sierra] & ~2)!= 0){ | |
c3ed85a3 DJ |
1410 | printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " |
1411 | "(%ld %x).\n", | |
1412 | inode->i_ino, de->flags[-high_sierra]); | |
1da177e4 LT |
1413 | } |
1414 | #endif | |
1415 | ||
1416 | inode->i_mtime.tv_sec = | |
1417 | inode->i_atime.tv_sec = | |
1418 | inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); | |
1419 | inode->i_mtime.tv_nsec = | |
1420 | inode->i_atime.tv_nsec = | |
1421 | inode->i_ctime.tv_nsec = 0; | |
1422 | ||
c3ed85a3 DJ |
1423 | ei->i_first_extent = (isonum_733(de->extent) + |
1424 | isonum_711(de->ext_attr_length)); | |
1da177e4 LT |
1425 | |
1426 | /* Set the number of blocks for stat() - should be done before RR */ | |
c3ed85a3 | 1427 | inode->i_blocks = (inode->i_size + 511) >> 9; |
1da177e4 LT |
1428 | |
1429 | /* | |
1430 | * Now test for possible Rock Ridge extensions which will override | |
1431 | * some of these numbers in the inode structure. | |
1432 | */ | |
1433 | ||
1434 | if (!high_sierra) { | |
410dd3cf | 1435 | parse_rock_ridge_inode(de, inode, relocated); |
1da177e4 | 1436 | /* if we want uid/gid set, override the rock ridge setting */ |
5c4a656b JK |
1437 | if (sbi->s_uid_set) |
1438 | inode->i_uid = sbi->s_uid; | |
1439 | if (sbi->s_gid_set) | |
1440 | inode->i_gid = sbi->s_gid; | |
1da177e4 | 1441 | } |
52b680c8 JK |
1442 | /* Now set final access rights if overriding rock ridge setting */ |
1443 | if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && | |
1444 | sbi->s_dmode != ISOFS_INVALID_MODE) | |
1445 | inode->i_mode = S_IFDIR | sbi->s_dmode; | |
1446 | if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && | |
1447 | sbi->s_fmode != ISOFS_INVALID_MODE) | |
1448 | inode->i_mode = S_IFREG | sbi->s_fmode; | |
1da177e4 LT |
1449 | |
1450 | /* Install the inode operations vector */ | |
1451 | if (S_ISREG(inode->i_mode)) { | |
1452 | inode->i_fop = &generic_ro_fops; | |
c3ed85a3 | 1453 | switch (ei->i_file_format) { |
1da177e4 LT |
1454 | #ifdef CONFIG_ZISOFS |
1455 | case isofs_file_compressed: | |
1456 | inode->i_data.a_ops = &zisofs_aops; | |
1457 | break; | |
1458 | #endif | |
1459 | default: | |
1460 | inode->i_data.a_ops = &isofs_aops; | |
1461 | break; | |
1462 | } | |
1463 | } else if (S_ISDIR(inode->i_mode)) { | |
1464 | inode->i_op = &isofs_dir_inode_operations; | |
1465 | inode->i_fop = &isofs_dir_operations; | |
1466 | } else if (S_ISLNK(inode->i_mode)) { | |
1467 | inode->i_op = &page_symlink_inode_operations; | |
21fc61c7 | 1468 | inode_nohighmem(inode); |
1da177e4 LT |
1469 | inode->i_data.a_ops = &isofs_symlink_aops; |
1470 | } else | |
1471 | /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ | |
1472 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
1473 | ||
c4386c83 | 1474 | ret = 0; |
9eb7f2c6 | 1475 | out: |
f99d49ad | 1476 | kfree(tmpde); |
1da177e4 LT |
1477 | if (bh) |
1478 | brelse(bh); | |
c4386c83 | 1479 | return ret; |
1da177e4 | 1480 | |
9eb7f2c6 | 1481 | out_badread: |
1da177e4 | 1482 | printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); |
9eb7f2c6 | 1483 | fail: |
1da177e4 LT |
1484 | goto out; |
1485 | } | |
1486 | ||
1487 | struct isofs_iget5_callback_data { | |
1488 | unsigned long block; | |
1489 | unsigned long offset; | |
1490 | }; | |
1491 | ||
1492 | static int isofs_iget5_test(struct inode *ino, void *data) | |
1493 | { | |
1494 | struct iso_inode_info *i = ISOFS_I(ino); | |
1495 | struct isofs_iget5_callback_data *d = | |
1496 | (struct isofs_iget5_callback_data*)data; | |
1497 | return (i->i_iget5_block == d->block) | |
c3ed85a3 | 1498 | && (i->i_iget5_offset == d->offset); |
1da177e4 LT |
1499 | } |
1500 | ||
1501 | static int isofs_iget5_set(struct inode *ino, void *data) | |
1502 | { | |
1503 | struct iso_inode_info *i = ISOFS_I(ino); | |
1504 | struct isofs_iget5_callback_data *d = | |
1505 | (struct isofs_iget5_callback_data*)data; | |
1506 | i->i_iget5_block = d->block; | |
1507 | i->i_iget5_offset = d->offset; | |
1508 | return 0; | |
1509 | } | |
1510 | ||
1511 | /* Store, in the inode's containing structure, the block and block | |
1512 | * offset that point to the underlying meta-data for the inode. The | |
1513 | * code below is otherwise similar to the iget() code in | |
1514 | * include/linux/fs.h */ | |
410dd3cf JK |
1515 | struct inode *__isofs_iget(struct super_block *sb, |
1516 | unsigned long block, | |
1517 | unsigned long offset, | |
1518 | int relocated) | |
1da177e4 LT |
1519 | { |
1520 | unsigned long hashval; | |
1521 | struct inode *inode; | |
1522 | struct isofs_iget5_callback_data data; | |
c4386c83 | 1523 | long ret; |
1da177e4 LT |
1524 | |
1525 | if (offset >= 1ul << sb->s_blocksize_bits) | |
c4386c83 | 1526 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
1527 | |
1528 | data.block = block; | |
1529 | data.offset = offset; | |
1530 | ||
1531 | hashval = (block << sb->s_blocksize_bits) | offset; | |
1532 | ||
9eb7f2c6 | 1533 | inode = iget5_locked(sb, hashval, &isofs_iget5_test, |
c3ed85a3 | 1534 | &isofs_iget5_set, &data); |
1da177e4 | 1535 | |
c4386c83 DH |
1536 | if (!inode) |
1537 | return ERR_PTR(-ENOMEM); | |
1538 | ||
1539 | if (inode->i_state & I_NEW) { | |
410dd3cf | 1540 | ret = isofs_read_inode(inode, relocated); |
c4386c83 DH |
1541 | if (ret < 0) { |
1542 | iget_failed(inode); | |
1543 | inode = ERR_PTR(ret); | |
1544 | } else { | |
1545 | unlock_new_inode(inode); | |
1546 | } | |
1da177e4 LT |
1547 | } |
1548 | ||
1549 | return inode; | |
1550 | } | |
1551 | ||
152a0836 AV |
1552 | static struct dentry *isofs_mount(struct file_system_type *fs_type, |
1553 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1554 | { |
152a0836 | 1555 | return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); |
1da177e4 LT |
1556 | } |
1557 | ||
1558 | static struct file_system_type iso9660_fs_type = { | |
1559 | .owner = THIS_MODULE, | |
1560 | .name = "iso9660", | |
152a0836 | 1561 | .mount = isofs_mount, |
1da177e4 LT |
1562 | .kill_sb = kill_block_super, |
1563 | .fs_flags = FS_REQUIRES_DEV, | |
1564 | }; | |
7f78e035 | 1565 | MODULE_ALIAS_FS("iso9660"); |
fa7614dd | 1566 | MODULE_ALIAS("iso9660"); |
1da177e4 LT |
1567 | |
1568 | static int __init init_iso9660_fs(void) | |
1569 | { | |
1570 | int err = init_inodecache(); | |
1571 | if (err) | |
1572 | goto out; | |
1573 | #ifdef CONFIG_ZISOFS | |
1574 | err = zisofs_init(); | |
1575 | if (err) | |
1576 | goto out1; | |
1577 | #endif | |
1578 | err = register_filesystem(&iso9660_fs_type); | |
1579 | if (err) | |
1580 | goto out2; | |
1581 | return 0; | |
1582 | out2: | |
1583 | #ifdef CONFIG_ZISOFS | |
1584 | zisofs_cleanup(); | |
1585 | out1: | |
1586 | #endif | |
1587 | destroy_inodecache(); | |
1588 | out: | |
1589 | return err; | |
1590 | } | |
1591 | ||
1592 | static void __exit exit_iso9660_fs(void) | |
1593 | { | |
1594 | unregister_filesystem(&iso9660_fs_type); | |
1595 | #ifdef CONFIG_ZISOFS | |
1596 | zisofs_cleanup(); | |
1597 | #endif | |
1598 | destroy_inodecache(); | |
1599 | } | |
1600 | ||
1601 | module_init(init_iso9660_fs) | |
1602 | module_exit(exit_iso9660_fs) | |
1603 | MODULE_LICENSE("GPL"); |