Commit | Line | Data |
---|---|---|
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> |
1da177e4 LT |
18 | #include <linux/nls.h> |
19 | #include <linux/ctype.h> | |
94f2f715 AV |
20 | #include <linux/statfs.h> |
21 | #include <linux/cdrom.h> | |
1da177e4 | 22 | #include <linux/parser.h> |
3069083c | 23 | #include <linux/mpage.h> |
ba64e2b9 | 24 | #include <linux/user_namespace.h> |
1da177e4 | 25 | |
94f2f715 | 26 | #include "isofs.h" |
1da177e4 LT |
27 | #include "zisofs.h" |
28 | ||
29 | #define BEQUIET | |
30 | ||
da53be12 | 31 | static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); |
6fa67e70 | 32 | static int isofs_dentry_cmpi(const struct dentry *dentry, |
621e155a | 33 | unsigned int len, const char *str, const struct qstr *name); |
1da177e4 LT |
34 | |
35 | #ifdef CONFIG_JOLIET | |
da53be12 LT |
36 | static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); |
37 | static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); | |
6fa67e70 | 38 | static int isofs_dentry_cmpi_ms(const struct dentry *dentry, |
621e155a | 39 | unsigned int len, const char *str, const struct qstr *name); |
6fa67e70 | 40 | static int isofs_dentry_cmp_ms(const struct dentry *dentry, |
621e155a | 41 | unsigned int len, const char *str, const struct qstr *name); |
1da177e4 LT |
42 | #endif |
43 | ||
44 | static void isofs_put_super(struct super_block *sb) | |
45 | { | |
46 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
6cfd0148 | 47 | |
1da177e4 | 48 | #ifdef CONFIG_JOLIET |
6d729e44 | 49 | unload_nls(sbi->s_nls_iocharset); |
1da177e4 LT |
50 | #endif |
51 | ||
1da177e4 LT |
52 | kfree(sbi); |
53 | sb->s_fs_info = NULL; | |
54 | return; | |
55 | } | |
56 | ||
410dd3cf | 57 | static int isofs_read_inode(struct inode *, int relocated); |
726c3342 | 58 | static int isofs_statfs (struct dentry *, struct kstatfs *); |
1da177e4 | 59 | |
e18b890b | 60 | static struct kmem_cache *isofs_inode_cachep; |
1da177e4 LT |
61 | |
62 | static struct inode *isofs_alloc_inode(struct super_block *sb) | |
63 | { | |
64 | struct iso_inode_info *ei; | |
e94b1766 | 65 | ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
66 | if (!ei) |
67 | return NULL; | |
68 | return &ei->vfs_inode; | |
69 | } | |
70 | ||
fa0d7e3d | 71 | static void isofs_i_callback(struct rcu_head *head) |
1da177e4 | 72 | { |
fa0d7e3d | 73 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
74 | kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); |
75 | } | |
76 | ||
fa0d7e3d NP |
77 | static void isofs_destroy_inode(struct inode *inode) |
78 | { | |
79 | call_rcu(&inode->i_rcu, isofs_i_callback); | |
80 | } | |
81 | ||
51cc5068 | 82 | static void init_once(void *foo) |
1da177e4 | 83 | { |
9eb7f2c6 | 84 | struct iso_inode_info *ei = foo; |
1da177e4 | 85 | |
a35afb83 | 86 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 87 | } |
c3ed85a3 | 88 | |
b3b749b7 | 89 | static int __init init_inodecache(void) |
1da177e4 LT |
90 | { |
91 | isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", | |
c3ed85a3 DJ |
92 | sizeof(struct iso_inode_info), |
93 | 0, (SLAB_RECLAIM_ACCOUNT| | |
5d097056 | 94 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 95 | init_once); |
1da177e4 LT |
96 | if (isofs_inode_cachep == NULL) |
97 | return -ENOMEM; | |
98 | return 0; | |
99 | } | |
100 | ||
101 | static void destroy_inodecache(void) | |
102 | { | |
8c0a8537 KS |
103 | /* |
104 | * Make sure all delayed rcu free inodes are flushed before we | |
105 | * destroy cache. | |
106 | */ | |
107 | rcu_barrier(); | |
1a1d92c1 | 108 | kmem_cache_destroy(isofs_inode_cachep); |
1da177e4 LT |
109 | } |
110 | ||
111 | static int isofs_remount(struct super_block *sb, int *flags, char *data) | |
112 | { | |
02b9984d | 113 | sync_filesystem(sb); |
17b7f7cf JK |
114 | if (!(*flags & MS_RDONLY)) |
115 | return -EROFS; | |
1da177e4 LT |
116 | return 0; |
117 | } | |
118 | ||
ee9b6d61 | 119 | static const struct super_operations isofs_sops = { |
1da177e4 LT |
120 | .alloc_inode = isofs_alloc_inode, |
121 | .destroy_inode = isofs_destroy_inode, | |
1da177e4 LT |
122 | .put_super = isofs_put_super, |
123 | .statfs = isofs_statfs, | |
124 | .remount_fs = isofs_remount, | |
d0132eea | 125 | .show_options = generic_show_options, |
1da177e4 LT |
126 | }; |
127 | ||
128 | ||
e16404ed | 129 | static const struct dentry_operations isofs_dentry_ops[] = { |
1da177e4 LT |
130 | { |
131 | .d_hash = isofs_hashi, | |
132 | .d_compare = isofs_dentry_cmpi, | |
133 | }, | |
134 | #ifdef CONFIG_JOLIET | |
135 | { | |
136 | .d_hash = isofs_hash_ms, | |
137 | .d_compare = isofs_dentry_cmp_ms, | |
138 | }, | |
139 | { | |
140 | .d_hash = isofs_hashi_ms, | |
141 | .d_compare = isofs_dentry_cmpi_ms, | |
9eb7f2c6 | 142 | }, |
1da177e4 LT |
143 | #endif |
144 | }; | |
145 | ||
146 | struct iso9660_options{ | |
5404ac8e | 147 | unsigned int rock:1; |
8711c67b | 148 | unsigned int joliet:1; |
5404ac8e JK |
149 | unsigned int cruft:1; |
150 | unsigned int hide:1; | |
151 | unsigned int showassoc:1; | |
152 | unsigned int nocompress:1; | |
153 | unsigned int overriderockperm:1; | |
154 | unsigned int uid_set:1; | |
155 | unsigned int gid_set:1; | |
156 | unsigned int utf8:1; | |
157 | unsigned char map; | |
1da177e4 LT |
158 | unsigned char check; |
159 | unsigned int blocksize; | |
7328bdd6 AV |
160 | umode_t fmode; |
161 | umode_t dmode; | |
ba64e2b9 EB |
162 | kgid_t gid; |
163 | kuid_t uid; | |
1da177e4 | 164 | char *iocharset; |
c3ed85a3 DJ |
165 | /* LVE */ |
166 | s32 session; | |
167 | s32 sbsector; | |
1da177e4 LT |
168 | }; |
169 | ||
1da177e4 LT |
170 | /* |
171 | * Compute the hash for the isofs name corresponding to the dentry. | |
172 | */ | |
173 | static int | |
8387ff25 | 174 | isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) |
1da177e4 LT |
175 | { |
176 | const char *name; | |
177 | int len; | |
178 | char c; | |
179 | unsigned long hash; | |
180 | ||
181 | len = qstr->len; | |
182 | name = qstr->name; | |
183 | if (ms) { | |
184 | while (len && name[len-1] == '.') | |
185 | len--; | |
186 | } | |
187 | ||
8387ff25 | 188 | hash = init_name_hash(dentry); |
1da177e4 LT |
189 | while (len--) { |
190 | c = tolower(*name++); | |
f17e121f | 191 | hash = partial_name_hash(c, hash); |
1da177e4 LT |
192 | } |
193 | qstr->hash = end_name_hash(hash); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | /* | |
621e155a | 199 | * Compare of two isofs names. |
1da177e4 | 200 | */ |
621e155a NP |
201 | static int isofs_dentry_cmp_common( |
202 | unsigned int len, const char *str, | |
203 | const struct qstr *name, int ms, int ci) | |
1da177e4 LT |
204 | { |
205 | int alen, blen; | |
206 | ||
207 | /* A filename cannot end in '.' or we treat it like it has none */ | |
621e155a NP |
208 | alen = name->len; |
209 | blen = len; | |
1da177e4 | 210 | if (ms) { |
621e155a | 211 | while (alen && name->name[alen-1] == '.') |
1da177e4 | 212 | alen--; |
621e155a | 213 | while (blen && str[blen-1] == '.') |
1da177e4 LT |
214 | blen--; |
215 | } | |
216 | if (alen == blen) { | |
621e155a | 217 | if (ci) { |
a97df427 | 218 | if (strncasecmp(name->name, str, alen) == 0) |
621e155a NP |
219 | return 0; |
220 | } else { | |
221 | if (strncmp(name->name, str, alen) == 0) | |
222 | return 0; | |
223 | } | |
1da177e4 LT |
224 | } |
225 | return 1; | |
226 | } | |
227 | ||
1da177e4 | 228 | static int |
da53be12 | 229 | isofs_hashi(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 | 230 | { |
8387ff25 | 231 | return isofs_hashi_common(dentry, qstr, 0); |
1da177e4 LT |
232 | } |
233 | ||
1da177e4 | 234 | static int |
6fa67e70 | 235 | isofs_dentry_cmpi(const struct dentry *dentry, |
621e155a | 236 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 237 | { |
621e155a | 238 | return isofs_dentry_cmp_common(len, str, name, 0, 1); |
1da177e4 LT |
239 | } |
240 | ||
241 | #ifdef CONFIG_JOLIET | |
7ca2f234 AB |
242 | /* |
243 | * Compute the hash for the isofs name corresponding to the dentry. | |
244 | */ | |
245 | static int | |
8387ff25 | 246 | isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) |
7ca2f234 AB |
247 | { |
248 | const char *name; | |
249 | int len; | |
250 | ||
251 | len = qstr->len; | |
252 | name = qstr->name; | |
253 | if (ms) { | |
254 | while (len && name[len-1] == '.') | |
255 | len--; | |
256 | } | |
257 | ||
8387ff25 | 258 | qstr->hash = full_name_hash(dentry, name, len); |
7ca2f234 AB |
259 | |
260 | return 0; | |
261 | } | |
262 | ||
1da177e4 | 263 | static int |
da53be12 | 264 | isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 | 265 | { |
8387ff25 | 266 | return isofs_hash_common(dentry, qstr, 1); |
1da177e4 LT |
267 | } |
268 | ||
269 | static int | |
da53be12 | 270 | isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 | 271 | { |
8387ff25 | 272 | return isofs_hashi_common(dentry, qstr, 1); |
1da177e4 LT |
273 | } |
274 | ||
275 | static int | |
6fa67e70 | 276 | isofs_dentry_cmp_ms(const struct dentry *dentry, |
621e155a | 277 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 278 | { |
621e155a | 279 | return isofs_dentry_cmp_common(len, str, name, 1, 0); |
1da177e4 LT |
280 | } |
281 | ||
282 | static int | |
6fa67e70 | 283 | isofs_dentry_cmpi_ms(const struct dentry *dentry, |
621e155a | 284 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 285 | { |
621e155a | 286 | return isofs_dentry_cmp_common(len, str, name, 1, 1); |
1da177e4 LT |
287 | } |
288 | #endif | |
289 | ||
290 | enum { | |
291 | Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, | |
292 | Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, | |
293 | Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, | |
52b680c8 | 294 | Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, |
1da177e4 LT |
295 | }; |
296 | ||
a447c093 | 297 | static const match_table_t tokens = { |
1da177e4 LT |
298 | {Opt_norock, "norock"}, |
299 | {Opt_nojoliet, "nojoliet"}, | |
300 | {Opt_unhide, "unhide"}, | |
9769f4eb JW |
301 | {Opt_hide, "hide"}, |
302 | {Opt_showassoc, "showassoc"}, | |
1da177e4 LT |
303 | {Opt_cruft, "cruft"}, |
304 | {Opt_utf8, "utf8"}, | |
305 | {Opt_iocharset, "iocharset=%s"}, | |
306 | {Opt_map_a, "map=acorn"}, | |
307 | {Opt_map_a, "map=a"}, | |
308 | {Opt_map_n, "map=normal"}, | |
309 | {Opt_map_n, "map=n"}, | |
310 | {Opt_map_o, "map=off"}, | |
311 | {Opt_map_o, "map=o"}, | |
312 | {Opt_session, "session=%u"}, | |
313 | {Opt_sb, "sbsector=%u"}, | |
314 | {Opt_check_r, "check=relaxed"}, | |
315 | {Opt_check_r, "check=r"}, | |
316 | {Opt_check_s, "check=strict"}, | |
317 | {Opt_check_s, "check=s"}, | |
318 | {Opt_uid, "uid=%u"}, | |
319 | {Opt_gid, "gid=%u"}, | |
320 | {Opt_mode, "mode=%u"}, | |
9b7880e7 | 321 | {Opt_dmode, "dmode=%u"}, |
52b680c8 | 322 | {Opt_overriderockperm, "overriderockperm"}, |
1da177e4 LT |
323 | {Opt_block, "block=%u"}, |
324 | {Opt_ignore, "conv=binary"}, | |
325 | {Opt_ignore, "conv=b"}, | |
326 | {Opt_ignore, "conv=text"}, | |
327 | {Opt_ignore, "conv=t"}, | |
328 | {Opt_ignore, "conv=mtext"}, | |
329 | {Opt_ignore, "conv=m"}, | |
330 | {Opt_ignore, "conv=auto"}, | |
331 | {Opt_ignore, "conv=a"}, | |
332 | {Opt_nocompress, "nocompress"}, | |
333 | {Opt_err, NULL} | |
334 | }; | |
335 | ||
9eb7f2c6 | 336 | static int parse_options(char *options, struct iso9660_options *popt) |
1da177e4 LT |
337 | { |
338 | char *p; | |
339 | int option; | |
340 | ||
341 | popt->map = 'n'; | |
5404ac8e JK |
342 | popt->rock = 1; |
343 | popt->joliet = 1; | |
344 | popt->cruft = 0; | |
345 | popt->hide = 0; | |
346 | popt->showassoc = 0; | |
1da177e4 LT |
347 | popt->check = 'u'; /* unset */ |
348 | popt->nocompress = 0; | |
349 | popt->blocksize = 1024; | |
52b680c8 | 350 | popt->fmode = popt->dmode = ISOFS_INVALID_MODE; |
5c4a656b JK |
351 | popt->uid_set = 0; |
352 | popt->gid_set = 0; | |
ba64e2b9 EB |
353 | popt->gid = GLOBAL_ROOT_GID; |
354 | popt->uid = GLOBAL_ROOT_UID; | |
1da177e4 LT |
355 | popt->iocharset = NULL; |
356 | popt->utf8 = 0; | |
52b680c8 | 357 | popt->overriderockperm = 0; |
1da177e4 LT |
358 | popt->session=-1; |
359 | popt->sbsector=-1; | |
360 | if (!options) | |
361 | return 1; | |
362 | ||
363 | while ((p = strsep(&options, ",")) != NULL) { | |
364 | int token; | |
365 | substring_t args[MAX_OPT_ARGS]; | |
366 | unsigned n; | |
367 | ||
368 | if (!*p) | |
369 | continue; | |
370 | ||
371 | token = match_token(p, tokens, args); | |
372 | switch (token) { | |
373 | case Opt_norock: | |
5404ac8e | 374 | popt->rock = 0; |
1da177e4 LT |
375 | break; |
376 | case Opt_nojoliet: | |
5404ac8e | 377 | popt->joliet = 0; |
1da177e4 | 378 | break; |
9769f4eb | 379 | case Opt_hide: |
5404ac8e | 380 | popt->hide = 1; |
9769f4eb | 381 | break; |
1da177e4 | 382 | case Opt_unhide: |
9769f4eb | 383 | case Opt_showassoc: |
5404ac8e | 384 | popt->showassoc = 1; |
1da177e4 LT |
385 | break; |
386 | case Opt_cruft: | |
5404ac8e | 387 | popt->cruft = 1; |
1da177e4 LT |
388 | break; |
389 | case Opt_utf8: | |
390 | popt->utf8 = 1; | |
391 | break; | |
392 | #ifdef CONFIG_JOLIET | |
393 | case Opt_iocharset: | |
394 | popt->iocharset = match_strdup(&args[0]); | |
395 | break; | |
396 | #endif | |
397 | case Opt_map_a: | |
398 | popt->map = 'a'; | |
399 | break; | |
400 | case Opt_map_o: | |
401 | popt->map = 'o'; | |
402 | break; | |
403 | case Opt_map_n: | |
404 | popt->map = 'n'; | |
405 | break; | |
406 | case Opt_session: | |
407 | if (match_int(&args[0], &option)) | |
408 | return 0; | |
409 | n = option; | |
410 | if (n > 99) | |
411 | return 0; | |
412 | popt->session = n + 1; | |
413 | break; | |
414 | case Opt_sb: | |
415 | if (match_int(&args[0], &option)) | |
416 | return 0; | |
417 | popt->sbsector = option; | |
418 | break; | |
419 | case Opt_check_r: | |
420 | popt->check = 'r'; | |
421 | break; | |
422 | case Opt_check_s: | |
423 | popt->check = 's'; | |
424 | break; | |
425 | case Opt_ignore: | |
426 | break; | |
427 | case Opt_uid: | |
428 | if (match_int(&args[0], &option)) | |
429 | return 0; | |
ba64e2b9 EB |
430 | popt->uid = make_kuid(current_user_ns(), option); |
431 | if (!uid_valid(popt->uid)) | |
432 | return 0; | |
5c4a656b | 433 | popt->uid_set = 1; |
1da177e4 LT |
434 | break; |
435 | case Opt_gid: | |
436 | if (match_int(&args[0], &option)) | |
437 | return 0; | |
ba64e2b9 EB |
438 | popt->gid = make_kgid(current_user_ns(), option); |
439 | if (!gid_valid(popt->gid)) | |
440 | return 0; | |
5c4a656b | 441 | popt->gid_set = 1; |
1da177e4 LT |
442 | break; |
443 | case Opt_mode: | |
444 | if (match_int(&args[0], &option)) | |
445 | return 0; | |
9b7880e7 JK |
446 | popt->fmode = option; |
447 | break; | |
448 | case Opt_dmode: | |
449 | if (match_int(&args[0], &option)) | |
450 | return 0; | |
451 | popt->dmode = option; | |
1da177e4 | 452 | break; |
52b680c8 JK |
453 | case Opt_overriderockperm: |
454 | popt->overriderockperm = 1; | |
455 | break; | |
1da177e4 LT |
456 | case Opt_block: |
457 | if (match_int(&args[0], &option)) | |
458 | return 0; | |
459 | n = option; | |
460 | if (n != 512 && n != 1024 && n != 2048) | |
461 | return 0; | |
462 | popt->blocksize = n; | |
463 | break; | |
464 | case Opt_nocompress: | |
465 | popt->nocompress = 1; | |
466 | break; | |
467 | default: | |
468 | return 0; | |
469 | } | |
470 | } | |
471 | return 1; | |
472 | } | |
473 | ||
474 | /* | |
475 | * look if the driver can tell the multi session redirection value | |
476 | * | |
477 | * don't change this if you don't know what you do, please! | |
478 | * Multisession is legal only with XA disks. | |
479 | * A non-XA disk with more than one volume descriptor may do it right, but | |
480 | * usually is written in a nowhere standardized "multi-partition" manner. | |
481 | * Multisession uses absolute addressing (solely the first frame of the whole | |
482 | * track is #0), multi-partition uses relative addressing (each first frame of | |
483 | * each track is #0), and a track is not a session. | |
484 | * | |
485 | * A broken CDwriter software or drive firmware does not set new standards, | |
486 | * at least not if conflicting with the existing ones. | |
487 | * | |
488 | * emoenke@gwdg.de | |
489 | */ | |
490 | #define WE_OBEY_THE_WRITTEN_STANDARDS 1 | |
491 | ||
9eb7f2c6 | 492 | static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) |
1da177e4 LT |
493 | { |
494 | struct cdrom_multisession ms_info; | |
495 | unsigned int vol_desc_start; | |
496 | struct block_device *bdev = sb->s_bdev; | |
497 | int i; | |
498 | ||
499 | vol_desc_start=0; | |
500 | ms_info.addr_format=CDROM_LBA; | |
501 | if(session >= 0 && session <= 99) { | |
502 | struct cdrom_tocentry Te; | |
503 | Te.cdte_track=session; | |
504 | Te.cdte_format=CDROM_LBA; | |
505 | i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); | |
506 | if (!i) { | |
c3ed85a3 DJ |
507 | printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", |
508 | session, Te.cdte_addr.lba, | |
509 | Te.cdte_ctrl&CDROM_DATA_TRACK); | |
1da177e4 LT |
510 | if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) |
511 | return Te.cdte_addr.lba; | |
512 | } | |
c3ed85a3 DJ |
513 | |
514 | printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); | |
1da177e4 LT |
515 | } |
516 | i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); | |
9eb7f2c6 | 517 | if (session > 0) |
c3ed85a3 | 518 | printk(KERN_ERR "ISOFS: Invalid session number\n"); |
1da177e4 | 519 | #if 0 |
c3ed85a3 | 520 | printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); |
1da177e4 | 521 | if (i==0) { |
c3ed85a3 DJ |
522 | printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); |
523 | printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); | |
1da177e4 LT |
524 | } |
525 | #endif | |
526 | if (i==0) | |
527 | #if WE_OBEY_THE_WRITTEN_STANDARDS | |
c3ed85a3 | 528 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ |
1da177e4 | 529 | #endif |
c3ed85a3 | 530 | vol_desc_start=ms_info.addr.lba; |
1da177e4 LT |
531 | return vol_desc_start; |
532 | } | |
533 | ||
e45c9eff OZ |
534 | /* |
535 | * Check if root directory is empty (has less than 3 files). | |
536 | * | |
537 | * Used to detect broken CDs where ISO root directory is empty but Joliet root | |
538 | * directory is OK. If such CD has Rock Ridge extensions, they will be disabled | |
539 | * (and Joliet used instead) or else no files would be visible. | |
540 | */ | |
541 | static bool rootdir_empty(struct super_block *sb, unsigned long block) | |
542 | { | |
543 | int offset = 0, files = 0, de_len; | |
544 | struct iso_directory_record *de; | |
545 | struct buffer_head *bh; | |
546 | ||
547 | bh = sb_bread(sb, block); | |
548 | if (!bh) | |
549 | return true; | |
550 | while (files < 3) { | |
551 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
552 | de_len = *(unsigned char *) de; | |
553 | if (de_len == 0) | |
554 | break; | |
555 | files++; | |
556 | offset += de_len; | |
557 | } | |
558 | brelse(bh); | |
559 | return files < 3; | |
560 | } | |
561 | ||
1da177e4 LT |
562 | /* |
563 | * Initialize the superblock and read the root inode. | |
564 | * | |
565 | * Note: a check_disk_change() has been done immediately prior | |
566 | * to this call, so we don't need to check again. | |
567 | */ | |
568 | static int isofs_fill_super(struct super_block *s, void *data, int silent) | |
569 | { | |
c3ed85a3 DJ |
570 | struct buffer_head *bh = NULL, *pri_bh = NULL; |
571 | struct hs_primary_descriptor *h_pri = NULL; | |
572 | struct iso_primary_descriptor *pri = NULL; | |
1da177e4 | 573 | struct iso_supplementary_descriptor *sec = NULL; |
c3ed85a3 DJ |
574 | struct iso_directory_record *rootp; |
575 | struct inode *inode; | |
576 | struct iso9660_options opt; | |
577 | struct isofs_sb_info *sbi; | |
578 | unsigned long first_data_zone; | |
579 | int joliet_level = 0; | |
580 | int iso_blknum, block; | |
581 | int orig_zonesize; | |
c4386c83 | 582 | int table, error = -EINVAL; |
c3ed85a3 | 583 | unsigned int vol_desc_start; |
1da177e4 | 584 | |
d0132eea MS |
585 | save_mount_options(s, data); |
586 | ||
f8314dc6 | 587 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
4f819a78 | 588 | if (!sbi) |
1da177e4 LT |
589 | return -ENOMEM; |
590 | s->s_fs_info = sbi; | |
1da177e4 | 591 | |
9eb7f2c6 | 592 | if (!parse_options((char *)data, &opt)) |
1da177e4 LT |
593 | goto out_freesbi; |
594 | ||
595 | /* | |
596 | * First of all, get the hardware blocksize for this device. | |
597 | * If we don't know what it is, or the hardware blocksize is | |
598 | * larger than the blocksize the user specified, then use | |
599 | * that value. | |
600 | */ | |
601 | /* | |
602 | * What if bugger tells us to go beyond page size? | |
603 | */ | |
604 | opt.blocksize = sb_min_blocksize(s, opt.blocksize); | |
605 | ||
606 | sbi->s_high_sierra = 0; /* default is iso9660 */ | |
607 | ||
608 | vol_desc_start = (opt.sbsector != -1) ? | |
609 | opt.sbsector : isofs_get_last_session(s,opt.session); | |
610 | ||
c3ed85a3 DJ |
611 | for (iso_blknum = vol_desc_start+16; |
612 | iso_blknum < vol_desc_start+100; iso_blknum++) { | |
613 | struct hs_volume_descriptor *hdp; | |
614 | struct iso_volume_descriptor *vdp; | |
615 | ||
616 | block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); | |
617 | if (!(bh = sb_bread(s, block))) | |
618 | goto out_no_read; | |
619 | ||
620 | vdp = (struct iso_volume_descriptor *)bh->b_data; | |
621 | hdp = (struct hs_volume_descriptor *)bh->b_data; | |
622 | ||
623 | /* | |
624 | * Due to the overlapping physical location of the descriptors, | |
625 | * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure | |
626 | * proper identification in this case, we first check for ISO. | |
627 | */ | |
628 | if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { | |
629 | if (isonum_711(vdp->type) == ISO_VD_END) | |
630 | break; | |
631 | if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { | |
632 | if (pri == NULL) { | |
633 | pri = (struct iso_primary_descriptor *)vdp; | |
634 | /* Save the buffer in case we need it ... */ | |
635 | pri_bh = bh; | |
636 | bh = NULL; | |
637 | } | |
638 | } | |
1da177e4 | 639 | #ifdef CONFIG_JOLIET |
c3ed85a3 DJ |
640 | else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { |
641 | sec = (struct iso_supplementary_descriptor *)vdp; | |
642 | if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { | |
8711c67b | 643 | if (opt.joliet) { |
c3ed85a3 DJ |
644 | if (sec->escape[2] == 0x40) |
645 | joliet_level = 1; | |
646 | else if (sec->escape[2] == 0x43) | |
647 | joliet_level = 2; | |
648 | else if (sec->escape[2] == 0x45) | |
649 | joliet_level = 3; | |
650 | ||
651 | printk(KERN_DEBUG "ISO 9660 Extensions: " | |
652 | "Microsoft Joliet Level %d\n", | |
653 | joliet_level); | |
654 | } | |
655 | goto root_found; | |
656 | } else { | |
657 | /* Unknown supplementary volume descriptor */ | |
658 | sec = NULL; | |
659 | } | |
1da177e4 | 660 | } |
1da177e4 | 661 | #endif |
c3ed85a3 DJ |
662 | } else { |
663 | if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { | |
664 | if (isonum_711(hdp->type) != ISO_VD_PRIMARY) | |
665 | goto out_freebh; | |
666 | ||
667 | sbi->s_high_sierra = 1; | |
5404ac8e | 668 | opt.rock = 0; |
c3ed85a3 DJ |
669 | h_pri = (struct hs_primary_descriptor *)vdp; |
670 | goto root_found; | |
671 | } | |
1da177e4 | 672 | } |
1da177e4 | 673 | |
c3ed85a3 | 674 | /* Just skip any volume descriptors we don't recognize */ |
1da177e4 | 675 | |
c3ed85a3 DJ |
676 | brelse(bh); |
677 | bh = NULL; | |
1da177e4 LT |
678 | } |
679 | /* | |
680 | * If we fall through, either no volume descriptor was found, | |
681 | * or else we passed a primary descriptor looking for others. | |
682 | */ | |
683 | if (!pri) | |
684 | goto out_unknown_format; | |
685 | brelse(bh); | |
686 | bh = pri_bh; | |
687 | pri_bh = NULL; | |
688 | ||
689 | root_found: | |
690 | ||
5404ac8e | 691 | if (joliet_level && (pri == NULL || !opt.rock)) { |
c3ed85a3 DJ |
692 | /* This is the case of Joliet with the norock mount flag. |
693 | * A disc with both Joliet and Rock Ridge is handled later | |
694 | */ | |
695 | pri = (struct iso_primary_descriptor *) sec; | |
1da177e4 LT |
696 | } |
697 | ||
698 | if(sbi->s_high_sierra){ | |
c3ed85a3 DJ |
699 | rootp = (struct iso_directory_record *) h_pri->root_directory_record; |
700 | sbi->s_nzones = isonum_733(h_pri->volume_space_size); | |
701 | sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); | |
702 | sbi->s_max_size = isonum_733(h_pri->volume_space_size); | |
1da177e4 | 703 | } else { |
c3ed85a3 DJ |
704 | if (!pri) |
705 | goto out_freebh; | |
706 | rootp = (struct iso_directory_record *) pri->root_directory_record; | |
707 | sbi->s_nzones = isonum_733(pri->volume_space_size); | |
708 | sbi->s_log_zone_size = isonum_723(pri->logical_block_size); | |
709 | sbi->s_max_size = isonum_733(pri->volume_space_size); | |
1da177e4 LT |
710 | } |
711 | ||
712 | sbi->s_ninodes = 0; /* No way to figure this out easily */ | |
713 | ||
714 | orig_zonesize = sbi->s_log_zone_size; | |
715 | /* | |
716 | * If the zone size is smaller than the hardware sector size, | |
717 | * this is a fatal error. This would occur if the disc drive | |
718 | * had sectors that were 2048 bytes, but the filesystem had | |
719 | * blocks that were 512 bytes (which should only very rarely | |
720 | * happen.) | |
721 | */ | |
c3ed85a3 | 722 | if (orig_zonesize < opt.blocksize) |
1da177e4 LT |
723 | goto out_bad_size; |
724 | ||
725 | /* RDE: convert log zone size to bit shift */ | |
c3ed85a3 DJ |
726 | switch (sbi->s_log_zone_size) { |
727 | case 512: sbi->s_log_zone_size = 9; break; | |
728 | case 1024: sbi->s_log_zone_size = 10; break; | |
729 | case 2048: sbi->s_log_zone_size = 11; break; | |
1da177e4 | 730 | |
c3ed85a3 | 731 | default: |
1da177e4 | 732 | goto out_bad_zone_size; |
c3ed85a3 | 733 | } |
1da177e4 LT |
734 | |
735 | s->s_magic = ISOFS_SUPER_MAGIC; | |
66a362a2 JA |
736 | |
737 | /* | |
738 | * With multi-extent files, file size is only limited by the maximum | |
739 | * size of a file system, which is 8 TB. | |
740 | */ | |
741 | s->s_maxbytes = 0x80000000000LL; | |
1da177e4 | 742 | |
1da177e4 LT |
743 | /* Set this for reference. Its not currently used except on write |
744 | which we don't have .. */ | |
c3ed85a3 DJ |
745 | |
746 | first_data_zone = isonum_733(rootp->extent) + | |
747 | isonum_711(rootp->ext_attr_length); | |
1da177e4 LT |
748 | sbi->s_firstdatazone = first_data_zone; |
749 | #ifndef BEQUIET | |
c3ed85a3 DJ |
750 | printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", |
751 | sbi->s_max_size, 1UL << sbi->s_log_zone_size); | |
752 | printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); | |
1da177e4 | 753 | if(sbi->s_high_sierra) |
c3ed85a3 | 754 | printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); |
1da177e4 LT |
755 | #endif |
756 | ||
757 | /* | |
758 | * If the Joliet level is set, we _may_ decide to use the | |
759 | * secondary descriptor, but can't be sure until after we | |
760 | * read the root inode. But before reading the root inode | |
761 | * we may need to change the device blocksize, and would | |
762 | * rather release the old buffer first. So, we cache the | |
763 | * first_data_zone value from the secondary descriptor. | |
764 | */ | |
765 | if (joliet_level) { | |
766 | pri = (struct iso_primary_descriptor *) sec; | |
767 | rootp = (struct iso_directory_record *) | |
768 | pri->root_directory_record; | |
c3ed85a3 DJ |
769 | first_data_zone = isonum_733(rootp->extent) + |
770 | isonum_711(rootp->ext_attr_length); | |
1da177e4 LT |
771 | } |
772 | ||
773 | /* | |
774 | * We're all done using the volume descriptor, and may need | |
775 | * to change the device blocksize, so release the buffer now. | |
776 | */ | |
777 | brelse(pri_bh); | |
778 | brelse(bh); | |
779 | ||
780 | /* | |
781 | * Force the blocksize to 512 for 512 byte sectors. The file | |
782 | * read primitives really get it wrong in a bad way if we don't | |
783 | * do this. | |
784 | * | |
785 | * Note - we should never be setting the blocksize to something | |
786 | * less than the hardware sector size for the device. If we | |
787 | * do, we would end up having to read larger buffers and split | |
788 | * out portions to satisfy requests. | |
789 | * | |
790 | * Note2- the idea here is that we want to deal with the optimal | |
791 | * zonesize in the filesystem. If we have it set to something less, | |
792 | * then we have horrible problems with trying to piece together | |
793 | * bits of adjacent blocks in order to properly read directory | |
794 | * entries. By forcing the blocksize in this way, we ensure | |
795 | * that we will never be required to do this. | |
796 | */ | |
797 | sb_set_blocksize(s, orig_zonesize); | |
798 | ||
799 | sbi->s_nls_iocharset = NULL; | |
800 | ||
801 | #ifdef CONFIG_JOLIET | |
802 | if (joliet_level && opt.utf8 == 0) { | |
c3ed85a3 | 803 | char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; |
1da177e4 LT |
804 | sbi->s_nls_iocharset = load_nls(p); |
805 | if (! sbi->s_nls_iocharset) { | |
806 | /* Fail only if explicit charset specified */ | |
807 | if (opt.iocharset) | |
808 | goto out_freesbi; | |
809 | sbi->s_nls_iocharset = load_nls_default(); | |
810 | } | |
811 | } | |
812 | #endif | |
813 | s->s_op = &isofs_sops; | |
814 | s->s_export_op = &isofs_export_ops; | |
815 | sbi->s_mapping = opt.map; | |
5404ac8e | 816 | sbi->s_rock = (opt.rock ? 2 : 0); |
1da177e4 LT |
817 | sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ |
818 | sbi->s_cruft = opt.cruft; | |
9769f4eb JW |
819 | sbi->s_hide = opt.hide; |
820 | sbi->s_showassoc = opt.showassoc; | |
1da177e4 LT |
821 | sbi->s_uid = opt.uid; |
822 | sbi->s_gid = opt.gid; | |
5c4a656b JK |
823 | sbi->s_uid_set = opt.uid_set; |
824 | sbi->s_gid_set = opt.gid_set; | |
1da177e4 LT |
825 | sbi->s_utf8 = opt.utf8; |
826 | sbi->s_nocompress = opt.nocompress; | |
52b680c8 | 827 | sbi->s_overriderockperm = opt.overriderockperm; |
1da177e4 LT |
828 | /* |
829 | * It would be incredibly stupid to allow people to mark every file | |
830 | * on the disk as suid, so we merely allow them to set the default | |
831 | * permissions. | |
832 | */ | |
52b680c8 JK |
833 | if (opt.fmode != ISOFS_INVALID_MODE) |
834 | sbi->s_fmode = opt.fmode & 0777; | |
835 | else | |
836 | sbi->s_fmode = ISOFS_INVALID_MODE; | |
837 | if (opt.dmode != ISOFS_INVALID_MODE) | |
838 | sbi->s_dmode = opt.dmode & 0777; | |
839 | else | |
840 | sbi->s_dmode = ISOFS_INVALID_MODE; | |
1da177e4 LT |
841 | |
842 | /* | |
843 | * Read the root inode, which _may_ result in changing | |
844 | * the s_rock flag. Once we have the final s_rock value, | |
845 | * we then decide whether to use the Joliet descriptor. | |
846 | */ | |
847 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
c4386c83 DH |
848 | if (IS_ERR(inode)) |
849 | goto out_no_root; | |
1da177e4 | 850 | |
e45c9eff OZ |
851 | /* |
852 | * Fix for broken CDs with Rock Ridge and empty ISO root directory but | |
853 | * correct Joliet root directory. | |
854 | */ | |
855 | if (sbi->s_rock == 1 && joliet_level && | |
856 | rootdir_empty(s, sbi->s_firstdatazone)) { | |
857 | printk(KERN_NOTICE | |
858 | "ISOFS: primary root directory is empty. " | |
859 | "Disabling Rock Ridge and switching to Joliet."); | |
860 | sbi->s_rock = 0; | |
861 | } | |
862 | ||
1da177e4 LT |
863 | /* |
864 | * If this disk has both Rock Ridge and Joliet on it, then we | |
865 | * want to use Rock Ridge by default. This can be overridden | |
866 | * by using the norock mount option. There is still one other | |
867 | * possibility that is not taken into account: a Rock Ridge | |
868 | * CD with Unicode names. Until someone sees such a beast, it | |
869 | * will not be supported. | |
870 | */ | |
871 | if (sbi->s_rock == 1) { | |
872 | joliet_level = 0; | |
873 | } else if (joliet_level) { | |
874 | sbi->s_rock = 0; | |
875 | if (sbi->s_firstdatazone != first_data_zone) { | |
876 | sbi->s_firstdatazone = first_data_zone; | |
c3ed85a3 | 877 | printk(KERN_DEBUG |
1da177e4 LT |
878 | "ISOFS: changing to secondary root\n"); |
879 | iput(inode); | |
880 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
c4386c83 DH |
881 | if (IS_ERR(inode)) |
882 | goto out_no_root; | |
1da177e4 LT |
883 | } |
884 | } | |
885 | ||
886 | if (opt.check == 'u') { | |
887 | /* Only Joliet is case insensitive by default */ | |
c3ed85a3 DJ |
888 | if (joliet_level) |
889 | opt.check = 'r'; | |
890 | else | |
891 | opt.check = 's'; | |
1da177e4 LT |
892 | } |
893 | sbi->s_joliet_level = joliet_level; | |
894 | ||
817794e0 KK |
895 | /* Make sure the root inode is a directory */ |
896 | if (!S_ISDIR(inode->i_mode)) { | |
897 | printk(KERN_WARNING | |
898 | "isofs_fill_super: root inode is not a directory. " | |
899 | "Corrupted media?\n"); | |
900 | goto out_iput; | |
901 | } | |
902 | ||
1da177e4 | 903 | table = 0; |
c3ed85a3 DJ |
904 | if (joliet_level) |
905 | table += 2; | |
906 | if (opt.check == 'r') | |
907 | table++; | |
6cc9c1d2 | 908 | |
b0afd8e5 AV |
909 | if (table) |
910 | s->s_d_op = &isofs_dentry_ops[table - 1]; | |
6cc9c1d2 AV |
911 | |
912 | /* get the root dentry */ | |
48fde701 | 913 | s->s_root = d_make_root(inode); |
8fdd8c49 | 914 | if (!(s->s_root)) { |
8fdd8c49 AV |
915 | error = -ENOMEM; |
916 | goto out_no_inode; | |
917 | } | |
1da177e4 | 918 | |
f99d49ad | 919 | kfree(opt.iocharset); |
1da177e4 LT |
920 | |
921 | return 0; | |
922 | ||
923 | /* | |
924 | * Display error messages and free resources. | |
925 | */ | |
1da177e4 LT |
926 | out_iput: |
927 | iput(inode); | |
c4386c83 DH |
928 | goto out_no_inode; |
929 | out_no_root: | |
930 | error = PTR_ERR(inode); | |
931 | if (error != -ENOMEM) | |
932 | printk(KERN_WARNING "%s: get root inode failed\n", __func__); | |
933 | out_no_inode: | |
1da177e4 | 934 | #ifdef CONFIG_JOLIET |
6d729e44 | 935 | unload_nls(sbi->s_nls_iocharset); |
1da177e4 LT |
936 | #endif |
937 | goto out_freesbi; | |
938 | out_no_read: | |
c3ed85a3 DJ |
939 | printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", |
940 | __func__, s->s_id, iso_blknum, block); | |
c11760c6 | 941 | goto out_freebh; |
1da177e4 | 942 | out_bad_zone_size: |
c3ed85a3 | 943 | printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", |
1da177e4 LT |
944 | sbi->s_log_zone_size); |
945 | goto out_freebh; | |
946 | out_bad_size: | |
c3ed85a3 | 947 | printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", |
1da177e4 LT |
948 | orig_zonesize, opt.blocksize); |
949 | goto out_freebh; | |
950 | out_unknown_format: | |
951 | if (!silent) | |
c3ed85a3 | 952 | printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); |
1da177e4 LT |
953 | |
954 | out_freebh: | |
955 | brelse(bh); | |
c11760c6 | 956 | brelse(pri_bh); |
1da177e4 | 957 | out_freesbi: |
f99d49ad | 958 | kfree(opt.iocharset); |
1da177e4 LT |
959 | kfree(sbi); |
960 | s->s_fs_info = NULL; | |
c4386c83 | 961 | return error; |
1da177e4 LT |
962 | } |
963 | ||
726c3342 | 964 | static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 965 | { |
726c3342 | 966 | struct super_block *sb = dentry->d_sb; |
2430c4da | 967 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
726c3342 | 968 | |
1da177e4 LT |
969 | buf->f_type = ISOFS_SUPER_MAGIC; |
970 | buf->f_bsize = sb->s_blocksize; | |
971 | buf->f_blocks = (ISOFS_SB(sb)->s_nzones | |
c3ed85a3 | 972 | << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); |
1da177e4 LT |
973 | buf->f_bfree = 0; |
974 | buf->f_bavail = 0; | |
975 | buf->f_files = ISOFS_SB(sb)->s_ninodes; | |
976 | buf->f_ffree = 0; | |
2430c4da CL |
977 | buf->f_fsid.val[0] = (u32)id; |
978 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
979 | buf->f_namelen = NAME_MAX; |
980 | return 0; | |
981 | } | |
982 | ||
983 | /* | |
984 | * Get a set of blocks; filling in buffer_heads if already allocated | |
985 | * or getblk() if they are not. Returns the number of blocks inserted | |
c4386c83 | 986 | * (-ve == error.) |
1da177e4 | 987 | */ |
fde214d4 | 988 | int isofs_get_blocks(struct inode *inode, sector_t iblock, |
1da177e4 LT |
989 | struct buffer_head **bh, unsigned long nblocks) |
990 | { | |
fde214d4 | 991 | unsigned long b_off = iblock; |
1da177e4 LT |
992 | unsigned offset, sect_size; |
993 | unsigned int firstext; | |
994 | unsigned long nextblk, nextoff; | |
c4386c83 | 995 | int section, rv, error; |
1da177e4 LT |
996 | struct iso_inode_info *ei = ISOFS_I(inode); |
997 | ||
c4386c83 | 998 | error = -EIO; |
1da177e4 | 999 | rv = 0; |
fde214d4 | 1000 | if (iblock != b_off) { |
c3ed85a3 | 1001 | printk(KERN_DEBUG "%s: block number too large\n", __func__); |
1da177e4 LT |
1002 | goto abort; |
1003 | } | |
1004 | ||
c3ed85a3 DJ |
1005 | |
1006 | offset = 0; | |
1007 | firstext = ei->i_first_extent; | |
1da177e4 | 1008 | sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); |
c3ed85a3 DJ |
1009 | nextblk = ei->i_next_section_block; |
1010 | nextoff = ei->i_next_section_offset; | |
1011 | section = 0; | |
1da177e4 | 1012 | |
c3ed85a3 | 1013 | while (nblocks) { |
1da177e4 LT |
1014 | /* If we are *way* beyond the end of the file, print a message. |
1015 | * Access beyond the end of the file up to the next page boundary | |
1016 | * is normal, however because of the way the page cache works. | |
1017 | * In this case, we just return 0 so that we can properly fill | |
1018 | * the page with useless information without generating any | |
1019 | * I/O errors. | |
1020 | */ | |
09cbfeaf | 1021 | if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { |
fde214d4 JK |
1022 | printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", |
1023 | __func__, b_off, | |
1024 | (unsigned long long)inode->i_size); | |
1da177e4 LT |
1025 | goto abort; |
1026 | } | |
c3ed85a3 | 1027 | |
fb50ae74 JRV |
1028 | /* On the last section, nextblk == 0, section size is likely to |
1029 | * exceed sect_size by a partial block, and access beyond the | |
1030 | * end of the file will reach beyond the section size, too. | |
1031 | */ | |
1032 | while (nextblk && (b_off >= (offset + sect_size))) { | |
1033 | struct inode *ninode; | |
1034 | ||
1035 | offset += sect_size; | |
1036 | ninode = isofs_iget(inode->i_sb, nextblk, nextoff); | |
c4386c83 DH |
1037 | if (IS_ERR(ninode)) { |
1038 | error = PTR_ERR(ninode); | |
fb50ae74 | 1039 | goto abort; |
c4386c83 | 1040 | } |
fb50ae74 JRV |
1041 | firstext = ISOFS_I(ninode)->i_first_extent; |
1042 | sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); | |
1043 | nextblk = ISOFS_I(ninode)->i_next_section_block; | |
1044 | nextoff = ISOFS_I(ninode)->i_next_section_offset; | |
1045 | iput(ninode); | |
1046 | ||
1047 | if (++section > 100) { | |
c3ed85a3 DJ |
1048 | printk(KERN_DEBUG "%s: More than 100 file sections ?!?" |
1049 | " aborting...\n", __func__); | |
fde214d4 | 1050 | printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " |
c3ed85a3 | 1051 | "nextblk=%lu nextoff=%lu\n", __func__, |
fde214d4 | 1052 | b_off, firstext, (unsigned) sect_size, |
c3ed85a3 | 1053 | nextblk, nextoff); |
fb50ae74 | 1054 | goto abort; |
1da177e4 LT |
1055 | } |
1056 | } | |
c3ed85a3 DJ |
1057 | |
1058 | if (*bh) { | |
1da177e4 LT |
1059 | map_bh(*bh, inode->i_sb, firstext + b_off - offset); |
1060 | } else { | |
1061 | *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); | |
c3ed85a3 | 1062 | if (!*bh) |
1da177e4 LT |
1063 | goto abort; |
1064 | } | |
1065 | bh++; /* Next buffer head */ | |
1066 | b_off++; /* Next buffer offset */ | |
1067 | nblocks--; | |
1068 | rv++; | |
1069 | } | |
1070 | ||
c4386c83 | 1071 | error = 0; |
1da177e4 | 1072 | abort: |
c4386c83 | 1073 | return rv != 0 ? rv : error; |
1da177e4 LT |
1074 | } |
1075 | ||
1076 | /* | |
1077 | * Used by the standard interfaces. | |
1078 | */ | |
1079 | static int isofs_get_block(struct inode *inode, sector_t iblock, | |
1080 | struct buffer_head *bh_result, int create) | |
1081 | { | |
c4386c83 DH |
1082 | int ret; |
1083 | ||
9eb7f2c6 | 1084 | if (create) { |
c3ed85a3 | 1085 | printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); |
1da177e4 LT |
1086 | return -EROFS; |
1087 | } | |
1088 | ||
c4386c83 DH |
1089 | ret = isofs_get_blocks(inode, iblock, &bh_result, 1); |
1090 | return ret < 0 ? ret : 0; | |
1da177e4 LT |
1091 | } |
1092 | ||
1093 | static int isofs_bmap(struct inode *inode, sector_t block) | |
1094 | { | |
1095 | struct buffer_head dummy; | |
1096 | int error; | |
1097 | ||
1098 | dummy.b_state = 0; | |
1099 | dummy.b_blocknr = -1000; | |
1100 | error = isofs_get_block(inode, block, &dummy, 0); | |
1101 | if (!error) | |
1102 | return dummy.b_blocknr; | |
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | struct buffer_head *isofs_bread(struct inode *inode, sector_t block) | |
1107 | { | |
1108 | sector_t blknr = isofs_bmap(inode, block); | |
1109 | if (!blknr) | |
1110 | return NULL; | |
1111 | return sb_bread(inode->i_sb, blknr); | |
1112 | } | |
1113 | ||
1114 | static int isofs_readpage(struct file *file, struct page *page) | |
1115 | { | |
3069083c NJ |
1116 | return mpage_readpage(page, isofs_get_block); |
1117 | } | |
1118 | ||
1119 | static int isofs_readpages(struct file *file, struct address_space *mapping, | |
1120 | struct list_head *pages, unsigned nr_pages) | |
1121 | { | |
1122 | return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); | |
1da177e4 LT |
1123 | } |
1124 | ||
1125 | static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) | |
1126 | { | |
1127 | return generic_block_bmap(mapping,block,isofs_get_block); | |
1128 | } | |
1129 | ||
f5e54d6e | 1130 | static const struct address_space_operations isofs_aops = { |
1da177e4 | 1131 | .readpage = isofs_readpage, |
3069083c | 1132 | .readpages = isofs_readpages, |
1da177e4 LT |
1133 | .bmap = _isofs_bmap |
1134 | }; | |
1135 | ||
9eb7f2c6 | 1136 | static int isofs_read_level3_size(struct inode *inode) |
1da177e4 LT |
1137 | { |
1138 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1139 | int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; | |
c3ed85a3 | 1140 | struct buffer_head *bh = NULL; |
1da177e4 LT |
1141 | unsigned long block, offset, block_saved, offset_saved; |
1142 | int i = 0; | |
1143 | int more_entries = 0; | |
c3ed85a3 | 1144 | struct iso_directory_record *tmpde = NULL; |
1da177e4 LT |
1145 | struct iso_inode_info *ei = ISOFS_I(inode); |
1146 | ||
1147 | inode->i_size = 0; | |
1148 | ||
1149 | /* The first 16 blocks are reserved as the System Area. Thus, | |
1150 | * no inodes can appear in block 0. We use this to flag that | |
1151 | * this is the last section. */ | |
1152 | ei->i_next_section_block = 0; | |
1153 | ei->i_next_section_offset = 0; | |
1154 | ||
1155 | block = ei->i_iget5_block; | |
1156 | offset = ei->i_iget5_offset; | |
1157 | ||
1158 | do { | |
c3ed85a3 | 1159 | struct iso_directory_record *de; |
1da177e4 LT |
1160 | unsigned int de_len; |
1161 | ||
1162 | if (!bh) { | |
1163 | bh = sb_bread(inode->i_sb, block); | |
1164 | if (!bh) | |
1165 | goto out_noread; | |
1166 | } | |
1167 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1168 | de_len = *(unsigned char *) de; | |
1169 | ||
1170 | if (de_len == 0) { | |
1171 | brelse(bh); | |
1172 | bh = NULL; | |
1173 | ++block; | |
1174 | offset = 0; | |
1175 | continue; | |
1176 | } | |
1177 | ||
1178 | block_saved = block; | |
1179 | offset_saved = offset; | |
1180 | offset += de_len; | |
1181 | ||
1182 | /* Make sure we have a full directory entry */ | |
1183 | if (offset >= bufsize) { | |
1184 | int slop = bufsize - offset + de_len; | |
1185 | if (!tmpde) { | |
1186 | tmpde = kmalloc(256, GFP_KERNEL); | |
1187 | if (!tmpde) | |
1188 | goto out_nomem; | |
1189 | } | |
1190 | memcpy(tmpde, de, slop); | |
1191 | offset &= bufsize - 1; | |
1192 | block++; | |
1193 | brelse(bh); | |
1194 | bh = NULL; | |
1195 | if (offset) { | |
1196 | bh = sb_bread(inode->i_sb, block); | |
1197 | if (!bh) | |
1198 | goto out_noread; | |
9eb7f2c6 | 1199 | memcpy((void *)tmpde+slop, bh->b_data, offset); |
1da177e4 LT |
1200 | } |
1201 | de = tmpde; | |
1202 | } | |
1203 | ||
1204 | inode->i_size += isonum_733(de->size); | |
1205 | if (i == 1) { | |
1206 | ei->i_next_section_block = block_saved; | |
1207 | ei->i_next_section_offset = offset_saved; | |
1208 | } | |
1209 | ||
1210 | more_entries = de->flags[-high_sierra] & 0x80; | |
1211 | ||
1212 | i++; | |
9eb7f2c6 | 1213 | if (i > 100) |
1da177e4 | 1214 | goto out_toomany; |
9eb7f2c6 | 1215 | } while (more_entries); |
1da177e4 | 1216 | out: |
9eb7f2c6 | 1217 | kfree(tmpde); |
1da177e4 LT |
1218 | if (bh) |
1219 | brelse(bh); | |
1220 | return 0; | |
1221 | ||
1222 | out_nomem: | |
1223 | if (bh) | |
1224 | brelse(bh); | |
1225 | return -ENOMEM; | |
1226 | ||
1227 | out_noread: | |
1228 | printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); | |
f99d49ad | 1229 | kfree(tmpde); |
1da177e4 LT |
1230 | return -EIO; |
1231 | ||
1232 | out_toomany: | |
c3ed85a3 DJ |
1233 | printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" |
1234 | "isofs_read_level3_size: inode=%lu\n", | |
1235 | __func__, inode->i_ino); | |
1da177e4 LT |
1236 | goto out; |
1237 | } | |
1238 | ||
410dd3cf | 1239 | static int isofs_read_inode(struct inode *inode, int relocated) |
1da177e4 LT |
1240 | { |
1241 | struct super_block *sb = inode->i_sb; | |
1242 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
1243 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1244 | unsigned long block; | |
1245 | int high_sierra = sbi->s_high_sierra; | |
c3ed85a3 DJ |
1246 | struct buffer_head *bh = NULL; |
1247 | struct iso_directory_record *de; | |
1248 | struct iso_directory_record *tmpde = NULL; | |
1da177e4 LT |
1249 | unsigned int de_len; |
1250 | unsigned long offset; | |
1251 | struct iso_inode_info *ei = ISOFS_I(inode); | |
c4386c83 | 1252 | int ret = -EIO; |
1da177e4 LT |
1253 | |
1254 | block = ei->i_iget5_block; | |
1255 | bh = sb_bread(inode->i_sb, block); | |
1256 | if (!bh) | |
1257 | goto out_badread; | |
1258 | ||
1259 | offset = ei->i_iget5_offset; | |
1260 | ||
1261 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1262 | de_len = *(unsigned char *) de; | |
1263 | ||
1264 | if (offset + de_len > bufsize) { | |
1265 | int frag1 = bufsize - offset; | |
1266 | ||
1267 | tmpde = kmalloc(de_len, GFP_KERNEL); | |
1268 | if (tmpde == NULL) { | |
c3ed85a3 | 1269 | printk(KERN_INFO "%s: out of memory\n", __func__); |
c4386c83 | 1270 | ret = -ENOMEM; |
1da177e4 LT |
1271 | goto fail; |
1272 | } | |
1273 | memcpy(tmpde, bh->b_data + offset, frag1); | |
1274 | brelse(bh); | |
1275 | bh = sb_bread(inode->i_sb, ++block); | |
1276 | if (!bh) | |
1277 | goto out_badread; | |
1278 | memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); | |
1279 | de = tmpde; | |
1280 | } | |
1281 | ||
1282 | inode->i_ino = isofs_get_ino(ei->i_iget5_block, | |
c3ed85a3 DJ |
1283 | ei->i_iget5_offset, |
1284 | ISOFS_BUFFER_BITS(inode)); | |
1da177e4 LT |
1285 | |
1286 | /* Assume it is a normal-format file unless told otherwise */ | |
1287 | ei->i_file_format = isofs_file_normal; | |
1288 | ||
1289 | if (de->flags[-high_sierra] & 2) { | |
52b680c8 JK |
1290 | if (sbi->s_dmode != ISOFS_INVALID_MODE) |
1291 | inode->i_mode = S_IFDIR | sbi->s_dmode; | |
1292 | else | |
1293 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
bfe86848 | 1294 | set_nlink(inode, 1); /* |
c3ed85a3 DJ |
1295 | * Set to 1. We know there are 2, but |
1296 | * the find utility tries to optimize | |
1297 | * if it is 2, and it screws up. It is | |
1298 | * easier to give 1 which tells find to | |
1299 | * do it the hard way. | |
1300 | */ | |
1da177e4 | 1301 | } else { |
52b680c8 JK |
1302 | if (sbi->s_fmode != ISOFS_INVALID_MODE) { |
1303 | inode->i_mode = S_IFREG | sbi->s_fmode; | |
1304 | } else { | |
1305 | /* | |
1306 | * Set default permissions: r-x for all. The disc | |
1307 | * could be shared with DOS machines so virtually | |
1308 | * anything could be a valid executable. | |
1309 | */ | |
1310 | inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; | |
1311 | } | |
bfe86848 | 1312 | set_nlink(inode, 1); |
1da177e4 LT |
1313 | } |
1314 | inode->i_uid = sbi->s_uid; | |
1315 | inode->i_gid = sbi->s_gid; | |
ba52de12 | 1316 | inode->i_blocks = 0; |
1da177e4 LT |
1317 | |
1318 | ei->i_format_parm[0] = 0; | |
1319 | ei->i_format_parm[1] = 0; | |
1320 | ei->i_format_parm[2] = 0; | |
1321 | ||
c3ed85a3 | 1322 | ei->i_section_size = isonum_733(de->size); |
9eb7f2c6 | 1323 | if (de->flags[-high_sierra] & 0x80) { |
c4386c83 DH |
1324 | ret = isofs_read_level3_size(inode); |
1325 | if (ret < 0) | |
c3ed85a3 | 1326 | goto fail; |
c4386c83 | 1327 | ret = -EIO; |
1da177e4 LT |
1328 | } else { |
1329 | ei->i_next_section_block = 0; | |
1330 | ei->i_next_section_offset = 0; | |
c3ed85a3 | 1331 | inode->i_size = isonum_733(de->size); |
1da177e4 LT |
1332 | } |
1333 | ||
1334 | /* | |
1335 | * Some dipshit decided to store some other bit of information | |
1336 | * in the high byte of the file length. Truncate size in case | |
1337 | * this CDROM was mounted with the cruft option. | |
1338 | */ | |
1339 | ||
5404ac8e | 1340 | if (sbi->s_cruft) |
1da177e4 LT |
1341 | inode->i_size &= 0x00ffffff; |
1342 | ||
1343 | if (de->interleave[0]) { | |
c3ed85a3 | 1344 | printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); |
1da177e4 LT |
1345 | inode->i_size = 0; |
1346 | } | |
1347 | ||
1348 | /* I have no idea what file_unit_size is used for, so | |
1349 | we will flag it for now */ | |
1350 | if (de->file_unit_size[0] != 0) { | |
c3ed85a3 DJ |
1351 | printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", |
1352 | inode->i_ino); | |
1da177e4 LT |
1353 | } |
1354 | ||
1355 | /* I have no idea what other flag bits are used for, so | |
1356 | we will flag it for now */ | |
1357 | #ifdef DEBUG | |
1358 | if((de->flags[-high_sierra] & ~2)!= 0){ | |
c3ed85a3 DJ |
1359 | printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " |
1360 | "(%ld %x).\n", | |
1361 | inode->i_ino, de->flags[-high_sierra]); | |
1da177e4 LT |
1362 | } |
1363 | #endif | |
1364 | ||
1365 | inode->i_mtime.tv_sec = | |
1366 | inode->i_atime.tv_sec = | |
1367 | inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); | |
1368 | inode->i_mtime.tv_nsec = | |
1369 | inode->i_atime.tv_nsec = | |
1370 | inode->i_ctime.tv_nsec = 0; | |
1371 | ||
c3ed85a3 DJ |
1372 | ei->i_first_extent = (isonum_733(de->extent) + |
1373 | isonum_711(de->ext_attr_length)); | |
1da177e4 LT |
1374 | |
1375 | /* Set the number of blocks for stat() - should be done before RR */ | |
c3ed85a3 | 1376 | inode->i_blocks = (inode->i_size + 511) >> 9; |
1da177e4 LT |
1377 | |
1378 | /* | |
1379 | * Now test for possible Rock Ridge extensions which will override | |
1380 | * some of these numbers in the inode structure. | |
1381 | */ | |
1382 | ||
1383 | if (!high_sierra) { | |
410dd3cf | 1384 | parse_rock_ridge_inode(de, inode, relocated); |
1da177e4 | 1385 | /* if we want uid/gid set, override the rock ridge setting */ |
5c4a656b JK |
1386 | if (sbi->s_uid_set) |
1387 | inode->i_uid = sbi->s_uid; | |
1388 | if (sbi->s_gid_set) | |
1389 | inode->i_gid = sbi->s_gid; | |
1da177e4 | 1390 | } |
52b680c8 JK |
1391 | /* Now set final access rights if overriding rock ridge setting */ |
1392 | if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && | |
1393 | sbi->s_dmode != ISOFS_INVALID_MODE) | |
1394 | inode->i_mode = S_IFDIR | sbi->s_dmode; | |
1395 | if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && | |
1396 | sbi->s_fmode != ISOFS_INVALID_MODE) | |
1397 | inode->i_mode = S_IFREG | sbi->s_fmode; | |
1da177e4 LT |
1398 | |
1399 | /* Install the inode operations vector */ | |
1400 | if (S_ISREG(inode->i_mode)) { | |
1401 | inode->i_fop = &generic_ro_fops; | |
c3ed85a3 | 1402 | switch (ei->i_file_format) { |
1da177e4 LT |
1403 | #ifdef CONFIG_ZISOFS |
1404 | case isofs_file_compressed: | |
1405 | inode->i_data.a_ops = &zisofs_aops; | |
1406 | break; | |
1407 | #endif | |
1408 | default: | |
1409 | inode->i_data.a_ops = &isofs_aops; | |
1410 | break; | |
1411 | } | |
1412 | } else if (S_ISDIR(inode->i_mode)) { | |
1413 | inode->i_op = &isofs_dir_inode_operations; | |
1414 | inode->i_fop = &isofs_dir_operations; | |
1415 | } else if (S_ISLNK(inode->i_mode)) { | |
1416 | inode->i_op = &page_symlink_inode_operations; | |
21fc61c7 | 1417 | inode_nohighmem(inode); |
1da177e4 LT |
1418 | inode->i_data.a_ops = &isofs_symlink_aops; |
1419 | } else | |
1420 | /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ | |
1421 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
1422 | ||
c4386c83 | 1423 | ret = 0; |
9eb7f2c6 | 1424 | out: |
f99d49ad | 1425 | kfree(tmpde); |
1da177e4 LT |
1426 | if (bh) |
1427 | brelse(bh); | |
c4386c83 | 1428 | return ret; |
1da177e4 | 1429 | |
9eb7f2c6 | 1430 | out_badread: |
1da177e4 | 1431 | printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); |
9eb7f2c6 | 1432 | fail: |
1da177e4 LT |
1433 | goto out; |
1434 | } | |
1435 | ||
1436 | struct isofs_iget5_callback_data { | |
1437 | unsigned long block; | |
1438 | unsigned long offset; | |
1439 | }; | |
1440 | ||
1441 | static int isofs_iget5_test(struct inode *ino, void *data) | |
1442 | { | |
1443 | struct iso_inode_info *i = ISOFS_I(ino); | |
1444 | struct isofs_iget5_callback_data *d = | |
1445 | (struct isofs_iget5_callback_data*)data; | |
1446 | return (i->i_iget5_block == d->block) | |
c3ed85a3 | 1447 | && (i->i_iget5_offset == d->offset); |
1da177e4 LT |
1448 | } |
1449 | ||
1450 | static int isofs_iget5_set(struct inode *ino, void *data) | |
1451 | { | |
1452 | struct iso_inode_info *i = ISOFS_I(ino); | |
1453 | struct isofs_iget5_callback_data *d = | |
1454 | (struct isofs_iget5_callback_data*)data; | |
1455 | i->i_iget5_block = d->block; | |
1456 | i->i_iget5_offset = d->offset; | |
1457 | return 0; | |
1458 | } | |
1459 | ||
1460 | /* Store, in the inode's containing structure, the block and block | |
1461 | * offset that point to the underlying meta-data for the inode. The | |
1462 | * code below is otherwise similar to the iget() code in | |
1463 | * include/linux/fs.h */ | |
410dd3cf JK |
1464 | struct inode *__isofs_iget(struct super_block *sb, |
1465 | unsigned long block, | |
1466 | unsigned long offset, | |
1467 | int relocated) | |
1da177e4 LT |
1468 | { |
1469 | unsigned long hashval; | |
1470 | struct inode *inode; | |
1471 | struct isofs_iget5_callback_data data; | |
c4386c83 | 1472 | long ret; |
1da177e4 LT |
1473 | |
1474 | if (offset >= 1ul << sb->s_blocksize_bits) | |
c4386c83 | 1475 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
1476 | |
1477 | data.block = block; | |
1478 | data.offset = offset; | |
1479 | ||
1480 | hashval = (block << sb->s_blocksize_bits) | offset; | |
1481 | ||
9eb7f2c6 | 1482 | inode = iget5_locked(sb, hashval, &isofs_iget5_test, |
c3ed85a3 | 1483 | &isofs_iget5_set, &data); |
1da177e4 | 1484 | |
c4386c83 DH |
1485 | if (!inode) |
1486 | return ERR_PTR(-ENOMEM); | |
1487 | ||
1488 | if (inode->i_state & I_NEW) { | |
410dd3cf | 1489 | ret = isofs_read_inode(inode, relocated); |
c4386c83 DH |
1490 | if (ret < 0) { |
1491 | iget_failed(inode); | |
1492 | inode = ERR_PTR(ret); | |
1493 | } else { | |
1494 | unlock_new_inode(inode); | |
1495 | } | |
1da177e4 LT |
1496 | } |
1497 | ||
1498 | return inode; | |
1499 | } | |
1500 | ||
152a0836 AV |
1501 | static struct dentry *isofs_mount(struct file_system_type *fs_type, |
1502 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1503 | { |
17b7f7cf JK |
1504 | /* We don't support read-write mounts */ |
1505 | if (!(flags & MS_RDONLY)) | |
1506 | return ERR_PTR(-EACCES); | |
152a0836 | 1507 | return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); |
1da177e4 LT |
1508 | } |
1509 | ||
1510 | static struct file_system_type iso9660_fs_type = { | |
1511 | .owner = THIS_MODULE, | |
1512 | .name = "iso9660", | |
152a0836 | 1513 | .mount = isofs_mount, |
1da177e4 LT |
1514 | .kill_sb = kill_block_super, |
1515 | .fs_flags = FS_REQUIRES_DEV, | |
1516 | }; | |
7f78e035 | 1517 | MODULE_ALIAS_FS("iso9660"); |
fa7614dd | 1518 | MODULE_ALIAS("iso9660"); |
1da177e4 LT |
1519 | |
1520 | static int __init init_iso9660_fs(void) | |
1521 | { | |
1522 | int err = init_inodecache(); | |
1523 | if (err) | |
1524 | goto out; | |
1525 | #ifdef CONFIG_ZISOFS | |
1526 | err = zisofs_init(); | |
1527 | if (err) | |
1528 | goto out1; | |
1529 | #endif | |
1530 | err = register_filesystem(&iso9660_fs_type); | |
1531 | if (err) | |
1532 | goto out2; | |
1533 | return 0; | |
1534 | out2: | |
1535 | #ifdef CONFIG_ZISOFS | |
1536 | zisofs_cleanup(); | |
1537 | out1: | |
1538 | #endif | |
1539 | destroy_inodecache(); | |
1540 | out: | |
1541 | return err; | |
1542 | } | |
1543 | ||
1544 | static void __exit exit_iso9660_fs(void) | |
1545 | { | |
1546 | unregister_filesystem(&iso9660_fs_type); | |
1547 | #ifdef CONFIG_ZISOFS | |
1548 | zisofs_cleanup(); | |
1549 | #endif | |
1550 | destroy_inodecache(); | |
1551 | } | |
1552 | ||
1553 | module_init(init_iso9660_fs) | |
1554 | module_exit(exit_iso9660_fs) | |
1555 | MODULE_LICENSE("GPL"); |