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 | ||
b1e6a015 NP |
31 | static int isofs_hashi(const struct dentry *parent, const struct inode *inode, |
32 | struct qstr *qstr); | |
33 | static int isofs_hash(const struct dentry *parent, const struct inode *inode, | |
34 | struct qstr *qstr); | |
621e155a NP |
35 | static int isofs_dentry_cmpi(const struct dentry *parent, |
36 | const struct inode *pinode, | |
37 | const struct dentry *dentry, const struct inode *inode, | |
38 | unsigned int len, const char *str, const struct qstr *name); | |
39 | static int isofs_dentry_cmp(const struct dentry *parent, | |
40 | const struct inode *pinode, | |
41 | const struct dentry *dentry, const struct inode *inode, | |
42 | unsigned int len, const char *str, const struct qstr *name); | |
1da177e4 LT |
43 | |
44 | #ifdef CONFIG_JOLIET | |
b1e6a015 NP |
45 | static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode, |
46 | struct qstr *qstr); | |
47 | static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode, | |
48 | struct qstr *qstr); | |
621e155a NP |
49 | static int isofs_dentry_cmpi_ms(const struct dentry *parent, |
50 | const struct inode *pinode, | |
51 | const struct dentry *dentry, const struct inode *inode, | |
52 | unsigned int len, const char *str, const struct qstr *name); | |
53 | static int isofs_dentry_cmp_ms(const struct dentry *parent, | |
54 | const struct inode *pinode, | |
55 | const struct dentry *dentry, const struct inode *inode, | |
56 | unsigned int len, const char *str, const struct qstr *name); | |
1da177e4 LT |
57 | #endif |
58 | ||
59 | static void isofs_put_super(struct super_block *sb) | |
60 | { | |
61 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
6cfd0148 | 62 | |
1da177e4 | 63 | #ifdef CONFIG_JOLIET |
6d729e44 | 64 | unload_nls(sbi->s_nls_iocharset); |
1da177e4 LT |
65 | #endif |
66 | ||
1da177e4 LT |
67 | kfree(sbi); |
68 | sb->s_fs_info = NULL; | |
69 | return; | |
70 | } | |
71 | ||
c4386c83 | 72 | static int isofs_read_inode(struct inode *); |
726c3342 | 73 | static int isofs_statfs (struct dentry *, struct kstatfs *); |
1da177e4 | 74 | |
e18b890b | 75 | static struct kmem_cache *isofs_inode_cachep; |
1da177e4 LT |
76 | |
77 | static struct inode *isofs_alloc_inode(struct super_block *sb) | |
78 | { | |
79 | struct iso_inode_info *ei; | |
e94b1766 | 80 | ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
81 | if (!ei) |
82 | return NULL; | |
83 | return &ei->vfs_inode; | |
84 | } | |
85 | ||
fa0d7e3d | 86 | static void isofs_i_callback(struct rcu_head *head) |
1da177e4 | 87 | { |
fa0d7e3d | 88 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
89 | kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); |
90 | } | |
91 | ||
fa0d7e3d NP |
92 | static void isofs_destroy_inode(struct inode *inode) |
93 | { | |
94 | call_rcu(&inode->i_rcu, isofs_i_callback); | |
95 | } | |
96 | ||
51cc5068 | 97 | static void init_once(void *foo) |
1da177e4 | 98 | { |
9eb7f2c6 | 99 | struct iso_inode_info *ei = foo; |
1da177e4 | 100 | |
a35afb83 | 101 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 102 | } |
c3ed85a3 | 103 | |
1da177e4 LT |
104 | static int init_inodecache(void) |
105 | { | |
106 | isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", | |
c3ed85a3 DJ |
107 | sizeof(struct iso_inode_info), |
108 | 0, (SLAB_RECLAIM_ACCOUNT| | |
109 | SLAB_MEM_SPREAD), | |
20c2df83 | 110 | init_once); |
1da177e4 LT |
111 | if (isofs_inode_cachep == NULL) |
112 | return -ENOMEM; | |
113 | return 0; | |
114 | } | |
115 | ||
116 | static void destroy_inodecache(void) | |
117 | { | |
8c0a8537 KS |
118 | /* |
119 | * Make sure all delayed rcu free inodes are flushed before we | |
120 | * destroy cache. | |
121 | */ | |
122 | rcu_barrier(); | |
1a1d92c1 | 123 | kmem_cache_destroy(isofs_inode_cachep); |
1da177e4 LT |
124 | } |
125 | ||
126 | static int isofs_remount(struct super_block *sb, int *flags, char *data) | |
127 | { | |
128 | /* we probably want a lot more here */ | |
129 | *flags |= MS_RDONLY; | |
130 | return 0; | |
131 | } | |
132 | ||
ee9b6d61 | 133 | static const struct super_operations isofs_sops = { |
1da177e4 LT |
134 | .alloc_inode = isofs_alloc_inode, |
135 | .destroy_inode = isofs_destroy_inode, | |
1da177e4 LT |
136 | .put_super = isofs_put_super, |
137 | .statfs = isofs_statfs, | |
138 | .remount_fs = isofs_remount, | |
d0132eea | 139 | .show_options = generic_show_options, |
1da177e4 LT |
140 | }; |
141 | ||
142 | ||
e16404ed | 143 | static const struct dentry_operations isofs_dentry_ops[] = { |
1da177e4 LT |
144 | { |
145 | .d_hash = isofs_hash, | |
146 | .d_compare = isofs_dentry_cmp, | |
147 | }, | |
148 | { | |
149 | .d_hash = isofs_hashi, | |
150 | .d_compare = isofs_dentry_cmpi, | |
151 | }, | |
152 | #ifdef CONFIG_JOLIET | |
153 | { | |
154 | .d_hash = isofs_hash_ms, | |
155 | .d_compare = isofs_dentry_cmp_ms, | |
156 | }, | |
157 | { | |
158 | .d_hash = isofs_hashi_ms, | |
159 | .d_compare = isofs_dentry_cmpi_ms, | |
9eb7f2c6 | 160 | }, |
1da177e4 LT |
161 | #endif |
162 | }; | |
163 | ||
164 | struct iso9660_options{ | |
5404ac8e | 165 | unsigned int rock:1; |
8711c67b | 166 | unsigned int joliet:1; |
5404ac8e JK |
167 | unsigned int cruft:1; |
168 | unsigned int hide:1; | |
169 | unsigned int showassoc:1; | |
170 | unsigned int nocompress:1; | |
171 | unsigned int overriderockperm:1; | |
172 | unsigned int uid_set:1; | |
173 | unsigned int gid_set:1; | |
174 | unsigned int utf8:1; | |
175 | unsigned char map; | |
1da177e4 LT |
176 | unsigned char check; |
177 | unsigned int blocksize; | |
7328bdd6 AV |
178 | umode_t fmode; |
179 | umode_t dmode; | |
ba64e2b9 EB |
180 | kgid_t gid; |
181 | kuid_t uid; | |
1da177e4 | 182 | char *iocharset; |
c3ed85a3 DJ |
183 | /* LVE */ |
184 | s32 session; | |
185 | s32 sbsector; | |
1da177e4 LT |
186 | }; |
187 | ||
188 | /* | |
189 | * Compute the hash for the isofs name corresponding to the dentry. | |
190 | */ | |
191 | static int | |
b1e6a015 | 192 | isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) |
1da177e4 LT |
193 | { |
194 | const char *name; | |
195 | int len; | |
196 | ||
197 | len = qstr->len; | |
198 | name = qstr->name; | |
199 | if (ms) { | |
200 | while (len && name[len-1] == '.') | |
201 | len--; | |
202 | } | |
203 | ||
204 | qstr->hash = full_name_hash(name, len); | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | /* | |
210 | * Compute the hash for the isofs name corresponding to the dentry. | |
211 | */ | |
212 | static int | |
b1e6a015 | 213 | isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) |
1da177e4 LT |
214 | { |
215 | const char *name; | |
216 | int len; | |
217 | char c; | |
218 | unsigned long hash; | |
219 | ||
220 | len = qstr->len; | |
221 | name = qstr->name; | |
222 | if (ms) { | |
223 | while (len && name[len-1] == '.') | |
224 | len--; | |
225 | } | |
226 | ||
227 | hash = init_name_hash(); | |
228 | while (len--) { | |
229 | c = tolower(*name++); | |
f17e121f | 230 | hash = partial_name_hash(c, hash); |
1da177e4 LT |
231 | } |
232 | qstr->hash = end_name_hash(hash); | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | /* | |
621e155a | 238 | * Compare of two isofs names. |
1da177e4 | 239 | */ |
621e155a NP |
240 | static int isofs_dentry_cmp_common( |
241 | unsigned int len, const char *str, | |
242 | const struct qstr *name, int ms, int ci) | |
1da177e4 LT |
243 | { |
244 | int alen, blen; | |
245 | ||
246 | /* A filename cannot end in '.' or we treat it like it has none */ | |
621e155a NP |
247 | alen = name->len; |
248 | blen = len; | |
1da177e4 | 249 | if (ms) { |
621e155a | 250 | while (alen && name->name[alen-1] == '.') |
1da177e4 | 251 | alen--; |
621e155a | 252 | while (blen && str[blen-1] == '.') |
1da177e4 LT |
253 | blen--; |
254 | } | |
255 | if (alen == blen) { | |
621e155a NP |
256 | if (ci) { |
257 | if (strnicmp(name->name, str, alen) == 0) | |
258 | return 0; | |
259 | } else { | |
260 | if (strncmp(name->name, str, alen) == 0) | |
261 | return 0; | |
262 | } | |
1da177e4 LT |
263 | } |
264 | return 1; | |
265 | } | |
266 | ||
267 | static int | |
b1e6a015 NP |
268 | isofs_hash(const struct dentry *dentry, const struct inode *inode, |
269 | struct qstr *qstr) | |
1da177e4 LT |
270 | { |
271 | return isofs_hash_common(dentry, qstr, 0); | |
272 | } | |
273 | ||
274 | static int | |
b1e6a015 NP |
275 | isofs_hashi(const struct dentry *dentry, const struct inode *inode, |
276 | struct qstr *qstr) | |
1da177e4 LT |
277 | { |
278 | return isofs_hashi_common(dentry, qstr, 0); | |
279 | } | |
280 | ||
281 | static int | |
621e155a NP |
282 | isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode, |
283 | const struct dentry *dentry, const struct inode *inode, | |
284 | unsigned int len, const char *str, const struct qstr *name) | |
1da177e4 | 285 | { |
621e155a | 286 | return isofs_dentry_cmp_common(len, str, name, 0, 0); |
1da177e4 LT |
287 | } |
288 | ||
289 | static int | |
621e155a NP |
290 | isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode, |
291 | const struct dentry *dentry, const struct inode *inode, | |
292 | unsigned int len, const char *str, const struct qstr *name) | |
1da177e4 | 293 | { |
621e155a | 294 | return isofs_dentry_cmp_common(len, str, name, 0, 1); |
1da177e4 LT |
295 | } |
296 | ||
297 | #ifdef CONFIG_JOLIET | |
298 | static int | |
b1e6a015 NP |
299 | isofs_hash_ms(const struct dentry *dentry, const struct inode *inode, |
300 | struct qstr *qstr) | |
1da177e4 LT |
301 | { |
302 | return isofs_hash_common(dentry, qstr, 1); | |
303 | } | |
304 | ||
305 | static int | |
b1e6a015 NP |
306 | isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode, |
307 | struct qstr *qstr) | |
1da177e4 LT |
308 | { |
309 | return isofs_hashi_common(dentry, qstr, 1); | |
310 | } | |
311 | ||
312 | static int | |
621e155a NP |
313 | isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode, |
314 | const struct dentry *dentry, const struct inode *inode, | |
315 | unsigned int len, const char *str, const struct qstr *name) | |
1da177e4 | 316 | { |
621e155a | 317 | return isofs_dentry_cmp_common(len, str, name, 1, 0); |
1da177e4 LT |
318 | } |
319 | ||
320 | static int | |
621e155a NP |
321 | isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode, |
322 | const struct dentry *dentry, const struct inode *inode, | |
323 | unsigned int len, const char *str, const struct qstr *name) | |
1da177e4 | 324 | { |
621e155a | 325 | return isofs_dentry_cmp_common(len, str, name, 1, 1); |
1da177e4 LT |
326 | } |
327 | #endif | |
328 | ||
329 | enum { | |
330 | Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, | |
331 | Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, | |
332 | Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, | |
52b680c8 | 333 | Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, |
1da177e4 LT |
334 | }; |
335 | ||
a447c093 | 336 | static const match_table_t tokens = { |
1da177e4 LT |
337 | {Opt_norock, "norock"}, |
338 | {Opt_nojoliet, "nojoliet"}, | |
339 | {Opt_unhide, "unhide"}, | |
9769f4eb JW |
340 | {Opt_hide, "hide"}, |
341 | {Opt_showassoc, "showassoc"}, | |
1da177e4 LT |
342 | {Opt_cruft, "cruft"}, |
343 | {Opt_utf8, "utf8"}, | |
344 | {Opt_iocharset, "iocharset=%s"}, | |
345 | {Opt_map_a, "map=acorn"}, | |
346 | {Opt_map_a, "map=a"}, | |
347 | {Opt_map_n, "map=normal"}, | |
348 | {Opt_map_n, "map=n"}, | |
349 | {Opt_map_o, "map=off"}, | |
350 | {Opt_map_o, "map=o"}, | |
351 | {Opt_session, "session=%u"}, | |
352 | {Opt_sb, "sbsector=%u"}, | |
353 | {Opt_check_r, "check=relaxed"}, | |
354 | {Opt_check_r, "check=r"}, | |
355 | {Opt_check_s, "check=strict"}, | |
356 | {Opt_check_s, "check=s"}, | |
357 | {Opt_uid, "uid=%u"}, | |
358 | {Opt_gid, "gid=%u"}, | |
359 | {Opt_mode, "mode=%u"}, | |
9b7880e7 | 360 | {Opt_dmode, "dmode=%u"}, |
52b680c8 | 361 | {Opt_overriderockperm, "overriderockperm"}, |
1da177e4 LT |
362 | {Opt_block, "block=%u"}, |
363 | {Opt_ignore, "conv=binary"}, | |
364 | {Opt_ignore, "conv=b"}, | |
365 | {Opt_ignore, "conv=text"}, | |
366 | {Opt_ignore, "conv=t"}, | |
367 | {Opt_ignore, "conv=mtext"}, | |
368 | {Opt_ignore, "conv=m"}, | |
369 | {Opt_ignore, "conv=auto"}, | |
370 | {Opt_ignore, "conv=a"}, | |
371 | {Opt_nocompress, "nocompress"}, | |
372 | {Opt_err, NULL} | |
373 | }; | |
374 | ||
9eb7f2c6 | 375 | static int parse_options(char *options, struct iso9660_options *popt) |
1da177e4 LT |
376 | { |
377 | char *p; | |
378 | int option; | |
379 | ||
380 | popt->map = 'n'; | |
5404ac8e JK |
381 | popt->rock = 1; |
382 | popt->joliet = 1; | |
383 | popt->cruft = 0; | |
384 | popt->hide = 0; | |
385 | popt->showassoc = 0; | |
1da177e4 LT |
386 | popt->check = 'u'; /* unset */ |
387 | popt->nocompress = 0; | |
388 | popt->blocksize = 1024; | |
52b680c8 | 389 | popt->fmode = popt->dmode = ISOFS_INVALID_MODE; |
5c4a656b JK |
390 | popt->uid_set = 0; |
391 | popt->gid_set = 0; | |
ba64e2b9 EB |
392 | popt->gid = GLOBAL_ROOT_GID; |
393 | popt->uid = GLOBAL_ROOT_UID; | |
1da177e4 LT |
394 | popt->iocharset = NULL; |
395 | popt->utf8 = 0; | |
52b680c8 | 396 | popt->overriderockperm = 0; |
1da177e4 LT |
397 | popt->session=-1; |
398 | popt->sbsector=-1; | |
399 | if (!options) | |
400 | return 1; | |
401 | ||
402 | while ((p = strsep(&options, ",")) != NULL) { | |
403 | int token; | |
404 | substring_t args[MAX_OPT_ARGS]; | |
405 | unsigned n; | |
406 | ||
407 | if (!*p) | |
408 | continue; | |
409 | ||
410 | token = match_token(p, tokens, args); | |
411 | switch (token) { | |
412 | case Opt_norock: | |
5404ac8e | 413 | popt->rock = 0; |
1da177e4 LT |
414 | break; |
415 | case Opt_nojoliet: | |
5404ac8e | 416 | popt->joliet = 0; |
1da177e4 | 417 | break; |
9769f4eb | 418 | case Opt_hide: |
5404ac8e | 419 | popt->hide = 1; |
9769f4eb | 420 | break; |
1da177e4 | 421 | case Opt_unhide: |
9769f4eb | 422 | case Opt_showassoc: |
5404ac8e | 423 | popt->showassoc = 1; |
1da177e4 LT |
424 | break; |
425 | case Opt_cruft: | |
5404ac8e | 426 | popt->cruft = 1; |
1da177e4 LT |
427 | break; |
428 | case Opt_utf8: | |
429 | popt->utf8 = 1; | |
430 | break; | |
431 | #ifdef CONFIG_JOLIET | |
432 | case Opt_iocharset: | |
433 | popt->iocharset = match_strdup(&args[0]); | |
434 | break; | |
435 | #endif | |
436 | case Opt_map_a: | |
437 | popt->map = 'a'; | |
438 | break; | |
439 | case Opt_map_o: | |
440 | popt->map = 'o'; | |
441 | break; | |
442 | case Opt_map_n: | |
443 | popt->map = 'n'; | |
444 | break; | |
445 | case Opt_session: | |
446 | if (match_int(&args[0], &option)) | |
447 | return 0; | |
448 | n = option; | |
449 | if (n > 99) | |
450 | return 0; | |
451 | popt->session = n + 1; | |
452 | break; | |
453 | case Opt_sb: | |
454 | if (match_int(&args[0], &option)) | |
455 | return 0; | |
456 | popt->sbsector = option; | |
457 | break; | |
458 | case Opt_check_r: | |
459 | popt->check = 'r'; | |
460 | break; | |
461 | case Opt_check_s: | |
462 | popt->check = 's'; | |
463 | break; | |
464 | case Opt_ignore: | |
465 | break; | |
466 | case Opt_uid: | |
467 | if (match_int(&args[0], &option)) | |
468 | return 0; | |
ba64e2b9 EB |
469 | popt->uid = make_kuid(current_user_ns(), option); |
470 | if (!uid_valid(popt->uid)) | |
471 | return 0; | |
5c4a656b | 472 | popt->uid_set = 1; |
1da177e4 LT |
473 | break; |
474 | case Opt_gid: | |
475 | if (match_int(&args[0], &option)) | |
476 | return 0; | |
ba64e2b9 EB |
477 | popt->gid = make_kgid(current_user_ns(), option); |
478 | if (!gid_valid(popt->gid)) | |
479 | return 0; | |
5c4a656b | 480 | popt->gid_set = 1; |
1da177e4 LT |
481 | break; |
482 | case Opt_mode: | |
483 | if (match_int(&args[0], &option)) | |
484 | return 0; | |
9b7880e7 JK |
485 | popt->fmode = option; |
486 | break; | |
487 | case Opt_dmode: | |
488 | if (match_int(&args[0], &option)) | |
489 | return 0; | |
490 | popt->dmode = option; | |
1da177e4 | 491 | break; |
52b680c8 JK |
492 | case Opt_overriderockperm: |
493 | popt->overriderockperm = 1; | |
494 | break; | |
1da177e4 LT |
495 | case Opt_block: |
496 | if (match_int(&args[0], &option)) | |
497 | return 0; | |
498 | n = option; | |
499 | if (n != 512 && n != 1024 && n != 2048) | |
500 | return 0; | |
501 | popt->blocksize = n; | |
502 | break; | |
503 | case Opt_nocompress: | |
504 | popt->nocompress = 1; | |
505 | break; | |
506 | default: | |
507 | return 0; | |
508 | } | |
509 | } | |
510 | return 1; | |
511 | } | |
512 | ||
513 | /* | |
514 | * look if the driver can tell the multi session redirection value | |
515 | * | |
516 | * don't change this if you don't know what you do, please! | |
517 | * Multisession is legal only with XA disks. | |
518 | * A non-XA disk with more than one volume descriptor may do it right, but | |
519 | * usually is written in a nowhere standardized "multi-partition" manner. | |
520 | * Multisession uses absolute addressing (solely the first frame of the whole | |
521 | * track is #0), multi-partition uses relative addressing (each first frame of | |
522 | * each track is #0), and a track is not a session. | |
523 | * | |
524 | * A broken CDwriter software or drive firmware does not set new standards, | |
525 | * at least not if conflicting with the existing ones. | |
526 | * | |
527 | * emoenke@gwdg.de | |
528 | */ | |
529 | #define WE_OBEY_THE_WRITTEN_STANDARDS 1 | |
530 | ||
9eb7f2c6 | 531 | static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) |
1da177e4 LT |
532 | { |
533 | struct cdrom_multisession ms_info; | |
534 | unsigned int vol_desc_start; | |
535 | struct block_device *bdev = sb->s_bdev; | |
536 | int i; | |
537 | ||
538 | vol_desc_start=0; | |
539 | ms_info.addr_format=CDROM_LBA; | |
540 | if(session >= 0 && session <= 99) { | |
541 | struct cdrom_tocentry Te; | |
542 | Te.cdte_track=session; | |
543 | Te.cdte_format=CDROM_LBA; | |
544 | i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); | |
545 | if (!i) { | |
c3ed85a3 DJ |
546 | printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", |
547 | session, Te.cdte_addr.lba, | |
548 | Te.cdte_ctrl&CDROM_DATA_TRACK); | |
1da177e4 LT |
549 | if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) |
550 | return Te.cdte_addr.lba; | |
551 | } | |
c3ed85a3 DJ |
552 | |
553 | printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); | |
1da177e4 LT |
554 | } |
555 | i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); | |
9eb7f2c6 | 556 | if (session > 0) |
c3ed85a3 | 557 | printk(KERN_ERR "ISOFS: Invalid session number\n"); |
1da177e4 | 558 | #if 0 |
c3ed85a3 | 559 | printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); |
1da177e4 | 560 | if (i==0) { |
c3ed85a3 DJ |
561 | printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); |
562 | printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); | |
1da177e4 LT |
563 | } |
564 | #endif | |
565 | if (i==0) | |
566 | #if WE_OBEY_THE_WRITTEN_STANDARDS | |
c3ed85a3 | 567 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ |
1da177e4 | 568 | #endif |
c3ed85a3 | 569 | vol_desc_start=ms_info.addr.lba; |
1da177e4 LT |
570 | return vol_desc_start; |
571 | } | |
572 | ||
e45c9eff OZ |
573 | /* |
574 | * Check if root directory is empty (has less than 3 files). | |
575 | * | |
576 | * Used to detect broken CDs where ISO root directory is empty but Joliet root | |
577 | * directory is OK. If such CD has Rock Ridge extensions, they will be disabled | |
578 | * (and Joliet used instead) or else no files would be visible. | |
579 | */ | |
580 | static bool rootdir_empty(struct super_block *sb, unsigned long block) | |
581 | { | |
582 | int offset = 0, files = 0, de_len; | |
583 | struct iso_directory_record *de; | |
584 | struct buffer_head *bh; | |
585 | ||
586 | bh = sb_bread(sb, block); | |
587 | if (!bh) | |
588 | return true; | |
589 | while (files < 3) { | |
590 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
591 | de_len = *(unsigned char *) de; | |
592 | if (de_len == 0) | |
593 | break; | |
594 | files++; | |
595 | offset += de_len; | |
596 | } | |
597 | brelse(bh); | |
598 | return files < 3; | |
599 | } | |
600 | ||
1da177e4 LT |
601 | /* |
602 | * Initialize the superblock and read the root inode. | |
603 | * | |
604 | * Note: a check_disk_change() has been done immediately prior | |
605 | * to this call, so we don't need to check again. | |
606 | */ | |
607 | static int isofs_fill_super(struct super_block *s, void *data, int silent) | |
608 | { | |
c3ed85a3 DJ |
609 | struct buffer_head *bh = NULL, *pri_bh = NULL; |
610 | struct hs_primary_descriptor *h_pri = NULL; | |
611 | struct iso_primary_descriptor *pri = NULL; | |
1da177e4 | 612 | struct iso_supplementary_descriptor *sec = NULL; |
c3ed85a3 DJ |
613 | struct iso_directory_record *rootp; |
614 | struct inode *inode; | |
615 | struct iso9660_options opt; | |
616 | struct isofs_sb_info *sbi; | |
617 | unsigned long first_data_zone; | |
618 | int joliet_level = 0; | |
619 | int iso_blknum, block; | |
620 | int orig_zonesize; | |
c4386c83 | 621 | int table, error = -EINVAL; |
c3ed85a3 | 622 | unsigned int vol_desc_start; |
1da177e4 | 623 | |
d0132eea MS |
624 | save_mount_options(s, data); |
625 | ||
f8314dc6 | 626 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
4f819a78 | 627 | if (!sbi) |
1da177e4 LT |
628 | return -ENOMEM; |
629 | s->s_fs_info = sbi; | |
1da177e4 | 630 | |
9eb7f2c6 | 631 | if (!parse_options((char *)data, &opt)) |
1da177e4 LT |
632 | goto out_freesbi; |
633 | ||
634 | /* | |
635 | * First of all, get the hardware blocksize for this device. | |
636 | * If we don't know what it is, or the hardware blocksize is | |
637 | * larger than the blocksize the user specified, then use | |
638 | * that value. | |
639 | */ | |
640 | /* | |
641 | * What if bugger tells us to go beyond page size? | |
642 | */ | |
643 | opt.blocksize = sb_min_blocksize(s, opt.blocksize); | |
644 | ||
645 | sbi->s_high_sierra = 0; /* default is iso9660 */ | |
646 | ||
647 | vol_desc_start = (opt.sbsector != -1) ? | |
648 | opt.sbsector : isofs_get_last_session(s,opt.session); | |
649 | ||
c3ed85a3 DJ |
650 | for (iso_blknum = vol_desc_start+16; |
651 | iso_blknum < vol_desc_start+100; iso_blknum++) { | |
652 | struct hs_volume_descriptor *hdp; | |
653 | struct iso_volume_descriptor *vdp; | |
654 | ||
655 | block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); | |
656 | if (!(bh = sb_bread(s, block))) | |
657 | goto out_no_read; | |
658 | ||
659 | vdp = (struct iso_volume_descriptor *)bh->b_data; | |
660 | hdp = (struct hs_volume_descriptor *)bh->b_data; | |
661 | ||
662 | /* | |
663 | * Due to the overlapping physical location of the descriptors, | |
664 | * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure | |
665 | * proper identification in this case, we first check for ISO. | |
666 | */ | |
667 | if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { | |
668 | if (isonum_711(vdp->type) == ISO_VD_END) | |
669 | break; | |
670 | if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { | |
671 | if (pri == NULL) { | |
672 | pri = (struct iso_primary_descriptor *)vdp; | |
673 | /* Save the buffer in case we need it ... */ | |
674 | pri_bh = bh; | |
675 | bh = NULL; | |
676 | } | |
677 | } | |
1da177e4 | 678 | #ifdef CONFIG_JOLIET |
c3ed85a3 DJ |
679 | else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { |
680 | sec = (struct iso_supplementary_descriptor *)vdp; | |
681 | if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { | |
8711c67b | 682 | if (opt.joliet) { |
c3ed85a3 DJ |
683 | if (sec->escape[2] == 0x40) |
684 | joliet_level = 1; | |
685 | else if (sec->escape[2] == 0x43) | |
686 | joliet_level = 2; | |
687 | else if (sec->escape[2] == 0x45) | |
688 | joliet_level = 3; | |
689 | ||
690 | printk(KERN_DEBUG "ISO 9660 Extensions: " | |
691 | "Microsoft Joliet Level %d\n", | |
692 | joliet_level); | |
693 | } | |
694 | goto root_found; | |
695 | } else { | |
696 | /* Unknown supplementary volume descriptor */ | |
697 | sec = NULL; | |
698 | } | |
1da177e4 | 699 | } |
1da177e4 | 700 | #endif |
c3ed85a3 DJ |
701 | } else { |
702 | if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { | |
703 | if (isonum_711(hdp->type) != ISO_VD_PRIMARY) | |
704 | goto out_freebh; | |
705 | ||
706 | sbi->s_high_sierra = 1; | |
5404ac8e | 707 | opt.rock = 0; |
c3ed85a3 DJ |
708 | h_pri = (struct hs_primary_descriptor *)vdp; |
709 | goto root_found; | |
710 | } | |
1da177e4 | 711 | } |
1da177e4 | 712 | |
c3ed85a3 | 713 | /* Just skip any volume descriptors we don't recognize */ |
1da177e4 | 714 | |
c3ed85a3 DJ |
715 | brelse(bh); |
716 | bh = NULL; | |
1da177e4 LT |
717 | } |
718 | /* | |
719 | * If we fall through, either no volume descriptor was found, | |
720 | * or else we passed a primary descriptor looking for others. | |
721 | */ | |
722 | if (!pri) | |
723 | goto out_unknown_format; | |
724 | brelse(bh); | |
725 | bh = pri_bh; | |
726 | pri_bh = NULL; | |
727 | ||
728 | root_found: | |
729 | ||
5404ac8e | 730 | if (joliet_level && (pri == NULL || !opt.rock)) { |
c3ed85a3 DJ |
731 | /* This is the case of Joliet with the norock mount flag. |
732 | * A disc with both Joliet and Rock Ridge is handled later | |
733 | */ | |
734 | pri = (struct iso_primary_descriptor *) sec; | |
1da177e4 LT |
735 | } |
736 | ||
737 | if(sbi->s_high_sierra){ | |
c3ed85a3 DJ |
738 | rootp = (struct iso_directory_record *) h_pri->root_directory_record; |
739 | sbi->s_nzones = isonum_733(h_pri->volume_space_size); | |
740 | sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); | |
741 | sbi->s_max_size = isonum_733(h_pri->volume_space_size); | |
1da177e4 | 742 | } else { |
c3ed85a3 DJ |
743 | if (!pri) |
744 | goto out_freebh; | |
745 | rootp = (struct iso_directory_record *) pri->root_directory_record; | |
746 | sbi->s_nzones = isonum_733(pri->volume_space_size); | |
747 | sbi->s_log_zone_size = isonum_723(pri->logical_block_size); | |
748 | sbi->s_max_size = isonum_733(pri->volume_space_size); | |
1da177e4 LT |
749 | } |
750 | ||
751 | sbi->s_ninodes = 0; /* No way to figure this out easily */ | |
752 | ||
753 | orig_zonesize = sbi->s_log_zone_size; | |
754 | /* | |
755 | * If the zone size is smaller than the hardware sector size, | |
756 | * this is a fatal error. This would occur if the disc drive | |
757 | * had sectors that were 2048 bytes, but the filesystem had | |
758 | * blocks that were 512 bytes (which should only very rarely | |
759 | * happen.) | |
760 | */ | |
c3ed85a3 | 761 | if (orig_zonesize < opt.blocksize) |
1da177e4 LT |
762 | goto out_bad_size; |
763 | ||
764 | /* RDE: convert log zone size to bit shift */ | |
c3ed85a3 DJ |
765 | switch (sbi->s_log_zone_size) { |
766 | case 512: sbi->s_log_zone_size = 9; break; | |
767 | case 1024: sbi->s_log_zone_size = 10; break; | |
768 | case 2048: sbi->s_log_zone_size = 11; break; | |
1da177e4 | 769 | |
c3ed85a3 | 770 | default: |
1da177e4 | 771 | goto out_bad_zone_size; |
c3ed85a3 | 772 | } |
1da177e4 LT |
773 | |
774 | s->s_magic = ISOFS_SUPER_MAGIC; | |
66a362a2 JA |
775 | |
776 | /* | |
777 | * With multi-extent files, file size is only limited by the maximum | |
778 | * size of a file system, which is 8 TB. | |
779 | */ | |
780 | s->s_maxbytes = 0x80000000000LL; | |
1da177e4 | 781 | |
c3ed85a3 DJ |
782 | /* |
783 | * The CDROM is read-only, has no nodes (devices) on it, and since | |
784 | * all of the files appear to be owned by root, we really do not want | |
785 | * to allow suid. (suid or devices will not show up unless we have | |
786 | * Rock Ridge extensions) | |
787 | */ | |
1da177e4 LT |
788 | |
789 | s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */; | |
790 | ||
791 | /* Set this for reference. Its not currently used except on write | |
792 | which we don't have .. */ | |
c3ed85a3 DJ |
793 | |
794 | first_data_zone = isonum_733(rootp->extent) + | |
795 | isonum_711(rootp->ext_attr_length); | |
1da177e4 LT |
796 | sbi->s_firstdatazone = first_data_zone; |
797 | #ifndef BEQUIET | |
c3ed85a3 DJ |
798 | printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", |
799 | sbi->s_max_size, 1UL << sbi->s_log_zone_size); | |
800 | printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); | |
1da177e4 | 801 | if(sbi->s_high_sierra) |
c3ed85a3 | 802 | printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); |
1da177e4 LT |
803 | #endif |
804 | ||
805 | /* | |
806 | * If the Joliet level is set, we _may_ decide to use the | |
807 | * secondary descriptor, but can't be sure until after we | |
808 | * read the root inode. But before reading the root inode | |
809 | * we may need to change the device blocksize, and would | |
810 | * rather release the old buffer first. So, we cache the | |
811 | * first_data_zone value from the secondary descriptor. | |
812 | */ | |
813 | if (joliet_level) { | |
814 | pri = (struct iso_primary_descriptor *) sec; | |
815 | rootp = (struct iso_directory_record *) | |
816 | pri->root_directory_record; | |
c3ed85a3 DJ |
817 | first_data_zone = isonum_733(rootp->extent) + |
818 | isonum_711(rootp->ext_attr_length); | |
1da177e4 LT |
819 | } |
820 | ||
821 | /* | |
822 | * We're all done using the volume descriptor, and may need | |
823 | * to change the device blocksize, so release the buffer now. | |
824 | */ | |
825 | brelse(pri_bh); | |
826 | brelse(bh); | |
827 | ||
828 | /* | |
829 | * Force the blocksize to 512 for 512 byte sectors. The file | |
830 | * read primitives really get it wrong in a bad way if we don't | |
831 | * do this. | |
832 | * | |
833 | * Note - we should never be setting the blocksize to something | |
834 | * less than the hardware sector size for the device. If we | |
835 | * do, we would end up having to read larger buffers and split | |
836 | * out portions to satisfy requests. | |
837 | * | |
838 | * Note2- the idea here is that we want to deal with the optimal | |
839 | * zonesize in the filesystem. If we have it set to something less, | |
840 | * then we have horrible problems with trying to piece together | |
841 | * bits of adjacent blocks in order to properly read directory | |
842 | * entries. By forcing the blocksize in this way, we ensure | |
843 | * that we will never be required to do this. | |
844 | */ | |
845 | sb_set_blocksize(s, orig_zonesize); | |
846 | ||
847 | sbi->s_nls_iocharset = NULL; | |
848 | ||
849 | #ifdef CONFIG_JOLIET | |
850 | if (joliet_level && opt.utf8 == 0) { | |
c3ed85a3 | 851 | char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; |
1da177e4 LT |
852 | sbi->s_nls_iocharset = load_nls(p); |
853 | if (! sbi->s_nls_iocharset) { | |
854 | /* Fail only if explicit charset specified */ | |
855 | if (opt.iocharset) | |
856 | goto out_freesbi; | |
857 | sbi->s_nls_iocharset = load_nls_default(); | |
858 | } | |
859 | } | |
860 | #endif | |
861 | s->s_op = &isofs_sops; | |
862 | s->s_export_op = &isofs_export_ops; | |
863 | sbi->s_mapping = opt.map; | |
5404ac8e | 864 | sbi->s_rock = (opt.rock ? 2 : 0); |
1da177e4 LT |
865 | sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ |
866 | sbi->s_cruft = opt.cruft; | |
9769f4eb JW |
867 | sbi->s_hide = opt.hide; |
868 | sbi->s_showassoc = opt.showassoc; | |
1da177e4 LT |
869 | sbi->s_uid = opt.uid; |
870 | sbi->s_gid = opt.gid; | |
5c4a656b JK |
871 | sbi->s_uid_set = opt.uid_set; |
872 | sbi->s_gid_set = opt.gid_set; | |
1da177e4 LT |
873 | sbi->s_utf8 = opt.utf8; |
874 | sbi->s_nocompress = opt.nocompress; | |
52b680c8 | 875 | sbi->s_overriderockperm = opt.overriderockperm; |
1da177e4 LT |
876 | /* |
877 | * It would be incredibly stupid to allow people to mark every file | |
878 | * on the disk as suid, so we merely allow them to set the default | |
879 | * permissions. | |
880 | */ | |
52b680c8 JK |
881 | if (opt.fmode != ISOFS_INVALID_MODE) |
882 | sbi->s_fmode = opt.fmode & 0777; | |
883 | else | |
884 | sbi->s_fmode = ISOFS_INVALID_MODE; | |
885 | if (opt.dmode != ISOFS_INVALID_MODE) | |
886 | sbi->s_dmode = opt.dmode & 0777; | |
887 | else | |
888 | sbi->s_dmode = ISOFS_INVALID_MODE; | |
1da177e4 LT |
889 | |
890 | /* | |
891 | * Read the root inode, which _may_ result in changing | |
892 | * the s_rock flag. Once we have the final s_rock value, | |
893 | * we then decide whether to use the Joliet descriptor. | |
894 | */ | |
895 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
c4386c83 DH |
896 | if (IS_ERR(inode)) |
897 | goto out_no_root; | |
1da177e4 | 898 | |
e45c9eff OZ |
899 | /* |
900 | * Fix for broken CDs with Rock Ridge and empty ISO root directory but | |
901 | * correct Joliet root directory. | |
902 | */ | |
903 | if (sbi->s_rock == 1 && joliet_level && | |
904 | rootdir_empty(s, sbi->s_firstdatazone)) { | |
905 | printk(KERN_NOTICE | |
906 | "ISOFS: primary root directory is empty. " | |
907 | "Disabling Rock Ridge and switching to Joliet."); | |
908 | sbi->s_rock = 0; | |
909 | } | |
910 | ||
1da177e4 LT |
911 | /* |
912 | * If this disk has both Rock Ridge and Joliet on it, then we | |
913 | * want to use Rock Ridge by default. This can be overridden | |
914 | * by using the norock mount option. There is still one other | |
915 | * possibility that is not taken into account: a Rock Ridge | |
916 | * CD with Unicode names. Until someone sees such a beast, it | |
917 | * will not be supported. | |
918 | */ | |
919 | if (sbi->s_rock == 1) { | |
920 | joliet_level = 0; | |
921 | } else if (joliet_level) { | |
922 | sbi->s_rock = 0; | |
923 | if (sbi->s_firstdatazone != first_data_zone) { | |
924 | sbi->s_firstdatazone = first_data_zone; | |
c3ed85a3 | 925 | printk(KERN_DEBUG |
1da177e4 LT |
926 | "ISOFS: changing to secondary root\n"); |
927 | iput(inode); | |
928 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
c4386c83 DH |
929 | if (IS_ERR(inode)) |
930 | goto out_no_root; | |
1da177e4 LT |
931 | } |
932 | } | |
933 | ||
934 | if (opt.check == 'u') { | |
935 | /* Only Joliet is case insensitive by default */ | |
c3ed85a3 DJ |
936 | if (joliet_level) |
937 | opt.check = 'r'; | |
938 | else | |
939 | opt.check = 's'; | |
1da177e4 LT |
940 | } |
941 | sbi->s_joliet_level = joliet_level; | |
942 | ||
817794e0 KK |
943 | /* Make sure the root inode is a directory */ |
944 | if (!S_ISDIR(inode->i_mode)) { | |
945 | printk(KERN_WARNING | |
946 | "isofs_fill_super: root inode is not a directory. " | |
947 | "Corrupted media?\n"); | |
948 | goto out_iput; | |
949 | } | |
950 | ||
1da177e4 | 951 | table = 0; |
c3ed85a3 DJ |
952 | if (joliet_level) |
953 | table += 2; | |
954 | if (opt.check == 'r') | |
955 | table++; | |
6cc9c1d2 AV |
956 | |
957 | s->s_d_op = &isofs_dentry_ops[table]; | |
958 | ||
959 | /* get the root dentry */ | |
48fde701 | 960 | s->s_root = d_make_root(inode); |
8fdd8c49 | 961 | if (!(s->s_root)) { |
8fdd8c49 AV |
962 | error = -ENOMEM; |
963 | goto out_no_inode; | |
964 | } | |
1da177e4 | 965 | |
f99d49ad | 966 | kfree(opt.iocharset); |
1da177e4 LT |
967 | |
968 | return 0; | |
969 | ||
970 | /* | |
971 | * Display error messages and free resources. | |
972 | */ | |
1da177e4 LT |
973 | out_iput: |
974 | iput(inode); | |
c4386c83 DH |
975 | goto out_no_inode; |
976 | out_no_root: | |
977 | error = PTR_ERR(inode); | |
978 | if (error != -ENOMEM) | |
979 | printk(KERN_WARNING "%s: get root inode failed\n", __func__); | |
980 | out_no_inode: | |
1da177e4 | 981 | #ifdef CONFIG_JOLIET |
6d729e44 | 982 | unload_nls(sbi->s_nls_iocharset); |
1da177e4 LT |
983 | #endif |
984 | goto out_freesbi; | |
985 | out_no_read: | |
c3ed85a3 DJ |
986 | printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", |
987 | __func__, s->s_id, iso_blknum, block); | |
c11760c6 | 988 | goto out_freebh; |
1da177e4 | 989 | out_bad_zone_size: |
c3ed85a3 | 990 | printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", |
1da177e4 LT |
991 | sbi->s_log_zone_size); |
992 | goto out_freebh; | |
993 | out_bad_size: | |
c3ed85a3 | 994 | printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", |
1da177e4 LT |
995 | orig_zonesize, opt.blocksize); |
996 | goto out_freebh; | |
997 | out_unknown_format: | |
998 | if (!silent) | |
c3ed85a3 | 999 | printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); |
1da177e4 LT |
1000 | |
1001 | out_freebh: | |
1002 | brelse(bh); | |
c11760c6 | 1003 | brelse(pri_bh); |
1da177e4 | 1004 | out_freesbi: |
f99d49ad | 1005 | kfree(opt.iocharset); |
1da177e4 LT |
1006 | kfree(sbi); |
1007 | s->s_fs_info = NULL; | |
c4386c83 | 1008 | return error; |
1da177e4 LT |
1009 | } |
1010 | ||
726c3342 | 1011 | static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 1012 | { |
726c3342 | 1013 | struct super_block *sb = dentry->d_sb; |
2430c4da | 1014 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
726c3342 | 1015 | |
1da177e4 LT |
1016 | buf->f_type = ISOFS_SUPER_MAGIC; |
1017 | buf->f_bsize = sb->s_blocksize; | |
1018 | buf->f_blocks = (ISOFS_SB(sb)->s_nzones | |
c3ed85a3 | 1019 | << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); |
1da177e4 LT |
1020 | buf->f_bfree = 0; |
1021 | buf->f_bavail = 0; | |
1022 | buf->f_files = ISOFS_SB(sb)->s_ninodes; | |
1023 | buf->f_ffree = 0; | |
2430c4da CL |
1024 | buf->f_fsid.val[0] = (u32)id; |
1025 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
1026 | buf->f_namelen = NAME_MAX; |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Get a set of blocks; filling in buffer_heads if already allocated | |
1032 | * or getblk() if they are not. Returns the number of blocks inserted | |
c4386c83 | 1033 | * (-ve == error.) |
1da177e4 | 1034 | */ |
fde214d4 | 1035 | int isofs_get_blocks(struct inode *inode, sector_t iblock, |
1da177e4 LT |
1036 | struct buffer_head **bh, unsigned long nblocks) |
1037 | { | |
fde214d4 | 1038 | unsigned long b_off = iblock; |
1da177e4 LT |
1039 | unsigned offset, sect_size; |
1040 | unsigned int firstext; | |
1041 | unsigned long nextblk, nextoff; | |
c4386c83 | 1042 | int section, rv, error; |
1da177e4 LT |
1043 | struct iso_inode_info *ei = ISOFS_I(inode); |
1044 | ||
c4386c83 | 1045 | error = -EIO; |
1da177e4 | 1046 | rv = 0; |
fde214d4 | 1047 | if (iblock != b_off) { |
c3ed85a3 | 1048 | printk(KERN_DEBUG "%s: block number too large\n", __func__); |
1da177e4 LT |
1049 | goto abort; |
1050 | } | |
1051 | ||
c3ed85a3 DJ |
1052 | |
1053 | offset = 0; | |
1054 | firstext = ei->i_first_extent; | |
1da177e4 | 1055 | sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); |
c3ed85a3 DJ |
1056 | nextblk = ei->i_next_section_block; |
1057 | nextoff = ei->i_next_section_offset; | |
1058 | section = 0; | |
1da177e4 | 1059 | |
c3ed85a3 | 1060 | while (nblocks) { |
1da177e4 LT |
1061 | /* If we are *way* beyond the end of the file, print a message. |
1062 | * Access beyond the end of the file up to the next page boundary | |
1063 | * is normal, however because of the way the page cache works. | |
1064 | * In this case, we just return 0 so that we can properly fill | |
1065 | * the page with useless information without generating any | |
1066 | * I/O errors. | |
1067 | */ | |
1068 | if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { | |
fde214d4 JK |
1069 | printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", |
1070 | __func__, b_off, | |
1071 | (unsigned long long)inode->i_size); | |
1da177e4 LT |
1072 | goto abort; |
1073 | } | |
c3ed85a3 | 1074 | |
fb50ae74 JRV |
1075 | /* On the last section, nextblk == 0, section size is likely to |
1076 | * exceed sect_size by a partial block, and access beyond the | |
1077 | * end of the file will reach beyond the section size, too. | |
1078 | */ | |
1079 | while (nextblk && (b_off >= (offset + sect_size))) { | |
1080 | struct inode *ninode; | |
1081 | ||
1082 | offset += sect_size; | |
1083 | ninode = isofs_iget(inode->i_sb, nextblk, nextoff); | |
c4386c83 DH |
1084 | if (IS_ERR(ninode)) { |
1085 | error = PTR_ERR(ninode); | |
fb50ae74 | 1086 | goto abort; |
c4386c83 | 1087 | } |
fb50ae74 JRV |
1088 | firstext = ISOFS_I(ninode)->i_first_extent; |
1089 | sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); | |
1090 | nextblk = ISOFS_I(ninode)->i_next_section_block; | |
1091 | nextoff = ISOFS_I(ninode)->i_next_section_offset; | |
1092 | iput(ninode); | |
1093 | ||
1094 | if (++section > 100) { | |
c3ed85a3 DJ |
1095 | printk(KERN_DEBUG "%s: More than 100 file sections ?!?" |
1096 | " aborting...\n", __func__); | |
fde214d4 | 1097 | printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " |
c3ed85a3 | 1098 | "nextblk=%lu nextoff=%lu\n", __func__, |
fde214d4 | 1099 | b_off, firstext, (unsigned) sect_size, |
c3ed85a3 | 1100 | nextblk, nextoff); |
fb50ae74 | 1101 | goto abort; |
1da177e4 LT |
1102 | } |
1103 | } | |
c3ed85a3 DJ |
1104 | |
1105 | if (*bh) { | |
1da177e4 LT |
1106 | map_bh(*bh, inode->i_sb, firstext + b_off - offset); |
1107 | } else { | |
1108 | *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); | |
c3ed85a3 | 1109 | if (!*bh) |
1da177e4 LT |
1110 | goto abort; |
1111 | } | |
1112 | bh++; /* Next buffer head */ | |
1113 | b_off++; /* Next buffer offset */ | |
1114 | nblocks--; | |
1115 | rv++; | |
1116 | } | |
1117 | ||
c4386c83 | 1118 | error = 0; |
1da177e4 | 1119 | abort: |
c4386c83 | 1120 | return rv != 0 ? rv : error; |
1da177e4 LT |
1121 | } |
1122 | ||
1123 | /* | |
1124 | * Used by the standard interfaces. | |
1125 | */ | |
1126 | static int isofs_get_block(struct inode *inode, sector_t iblock, | |
1127 | struct buffer_head *bh_result, int create) | |
1128 | { | |
c4386c83 DH |
1129 | int ret; |
1130 | ||
9eb7f2c6 | 1131 | if (create) { |
c3ed85a3 | 1132 | printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); |
1da177e4 LT |
1133 | return -EROFS; |
1134 | } | |
1135 | ||
c4386c83 DH |
1136 | ret = isofs_get_blocks(inode, iblock, &bh_result, 1); |
1137 | return ret < 0 ? ret : 0; | |
1da177e4 LT |
1138 | } |
1139 | ||
1140 | static int isofs_bmap(struct inode *inode, sector_t block) | |
1141 | { | |
1142 | struct buffer_head dummy; | |
1143 | int error; | |
1144 | ||
1145 | dummy.b_state = 0; | |
1146 | dummy.b_blocknr = -1000; | |
1147 | error = isofs_get_block(inode, block, &dummy, 0); | |
1148 | if (!error) | |
1149 | return dummy.b_blocknr; | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | struct buffer_head *isofs_bread(struct inode *inode, sector_t block) | |
1154 | { | |
1155 | sector_t blknr = isofs_bmap(inode, block); | |
1156 | if (!blknr) | |
1157 | return NULL; | |
1158 | return sb_bread(inode->i_sb, blknr); | |
1159 | } | |
1160 | ||
1161 | static int isofs_readpage(struct file *file, struct page *page) | |
1162 | { | |
3069083c NJ |
1163 | return mpage_readpage(page, isofs_get_block); |
1164 | } | |
1165 | ||
1166 | static int isofs_readpages(struct file *file, struct address_space *mapping, | |
1167 | struct list_head *pages, unsigned nr_pages) | |
1168 | { | |
1169 | return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); | |
1da177e4 LT |
1170 | } |
1171 | ||
1172 | static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) | |
1173 | { | |
1174 | return generic_block_bmap(mapping,block,isofs_get_block); | |
1175 | } | |
1176 | ||
f5e54d6e | 1177 | static const struct address_space_operations isofs_aops = { |
1da177e4 | 1178 | .readpage = isofs_readpage, |
3069083c | 1179 | .readpages = isofs_readpages, |
1da177e4 LT |
1180 | .bmap = _isofs_bmap |
1181 | }; | |
1182 | ||
9eb7f2c6 | 1183 | static int isofs_read_level3_size(struct inode *inode) |
1da177e4 LT |
1184 | { |
1185 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1186 | int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; | |
c3ed85a3 | 1187 | struct buffer_head *bh = NULL; |
1da177e4 LT |
1188 | unsigned long block, offset, block_saved, offset_saved; |
1189 | int i = 0; | |
1190 | int more_entries = 0; | |
c3ed85a3 | 1191 | struct iso_directory_record *tmpde = NULL; |
1da177e4 LT |
1192 | struct iso_inode_info *ei = ISOFS_I(inode); |
1193 | ||
1194 | inode->i_size = 0; | |
1195 | ||
1196 | /* The first 16 blocks are reserved as the System Area. Thus, | |
1197 | * no inodes can appear in block 0. We use this to flag that | |
1198 | * this is the last section. */ | |
1199 | ei->i_next_section_block = 0; | |
1200 | ei->i_next_section_offset = 0; | |
1201 | ||
1202 | block = ei->i_iget5_block; | |
1203 | offset = ei->i_iget5_offset; | |
1204 | ||
1205 | do { | |
c3ed85a3 | 1206 | struct iso_directory_record *de; |
1da177e4 LT |
1207 | unsigned int de_len; |
1208 | ||
1209 | if (!bh) { | |
1210 | bh = sb_bread(inode->i_sb, block); | |
1211 | if (!bh) | |
1212 | goto out_noread; | |
1213 | } | |
1214 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1215 | de_len = *(unsigned char *) de; | |
1216 | ||
1217 | if (de_len == 0) { | |
1218 | brelse(bh); | |
1219 | bh = NULL; | |
1220 | ++block; | |
1221 | offset = 0; | |
1222 | continue; | |
1223 | } | |
1224 | ||
1225 | block_saved = block; | |
1226 | offset_saved = offset; | |
1227 | offset += de_len; | |
1228 | ||
1229 | /* Make sure we have a full directory entry */ | |
1230 | if (offset >= bufsize) { | |
1231 | int slop = bufsize - offset + de_len; | |
1232 | if (!tmpde) { | |
1233 | tmpde = kmalloc(256, GFP_KERNEL); | |
1234 | if (!tmpde) | |
1235 | goto out_nomem; | |
1236 | } | |
1237 | memcpy(tmpde, de, slop); | |
1238 | offset &= bufsize - 1; | |
1239 | block++; | |
1240 | brelse(bh); | |
1241 | bh = NULL; | |
1242 | if (offset) { | |
1243 | bh = sb_bread(inode->i_sb, block); | |
1244 | if (!bh) | |
1245 | goto out_noread; | |
9eb7f2c6 | 1246 | memcpy((void *)tmpde+slop, bh->b_data, offset); |
1da177e4 LT |
1247 | } |
1248 | de = tmpde; | |
1249 | } | |
1250 | ||
1251 | inode->i_size += isonum_733(de->size); | |
1252 | if (i == 1) { | |
1253 | ei->i_next_section_block = block_saved; | |
1254 | ei->i_next_section_offset = offset_saved; | |
1255 | } | |
1256 | ||
1257 | more_entries = de->flags[-high_sierra] & 0x80; | |
1258 | ||
1259 | i++; | |
9eb7f2c6 | 1260 | if (i > 100) |
1da177e4 | 1261 | goto out_toomany; |
9eb7f2c6 | 1262 | } while (more_entries); |
1da177e4 | 1263 | out: |
9eb7f2c6 | 1264 | kfree(tmpde); |
1da177e4 LT |
1265 | if (bh) |
1266 | brelse(bh); | |
1267 | return 0; | |
1268 | ||
1269 | out_nomem: | |
1270 | if (bh) | |
1271 | brelse(bh); | |
1272 | return -ENOMEM; | |
1273 | ||
1274 | out_noread: | |
1275 | printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); | |
f99d49ad | 1276 | kfree(tmpde); |
1da177e4 LT |
1277 | return -EIO; |
1278 | ||
1279 | out_toomany: | |
c3ed85a3 DJ |
1280 | printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" |
1281 | "isofs_read_level3_size: inode=%lu\n", | |
1282 | __func__, inode->i_ino); | |
1da177e4 LT |
1283 | goto out; |
1284 | } | |
1285 | ||
c4386c83 | 1286 | static int isofs_read_inode(struct inode *inode) |
1da177e4 LT |
1287 | { |
1288 | struct super_block *sb = inode->i_sb; | |
1289 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
1290 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1291 | unsigned long block; | |
1292 | int high_sierra = sbi->s_high_sierra; | |
c3ed85a3 DJ |
1293 | struct buffer_head *bh = NULL; |
1294 | struct iso_directory_record *de; | |
1295 | struct iso_directory_record *tmpde = NULL; | |
1da177e4 LT |
1296 | unsigned int de_len; |
1297 | unsigned long offset; | |
1298 | struct iso_inode_info *ei = ISOFS_I(inode); | |
c4386c83 | 1299 | int ret = -EIO; |
1da177e4 LT |
1300 | |
1301 | block = ei->i_iget5_block; | |
1302 | bh = sb_bread(inode->i_sb, block); | |
1303 | if (!bh) | |
1304 | goto out_badread; | |
1305 | ||
1306 | offset = ei->i_iget5_offset; | |
1307 | ||
1308 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1309 | de_len = *(unsigned char *) de; | |
1310 | ||
1311 | if (offset + de_len > bufsize) { | |
1312 | int frag1 = bufsize - offset; | |
1313 | ||
1314 | tmpde = kmalloc(de_len, GFP_KERNEL); | |
1315 | if (tmpde == NULL) { | |
c3ed85a3 | 1316 | printk(KERN_INFO "%s: out of memory\n", __func__); |
c4386c83 | 1317 | ret = -ENOMEM; |
1da177e4 LT |
1318 | goto fail; |
1319 | } | |
1320 | memcpy(tmpde, bh->b_data + offset, frag1); | |
1321 | brelse(bh); | |
1322 | bh = sb_bread(inode->i_sb, ++block); | |
1323 | if (!bh) | |
1324 | goto out_badread; | |
1325 | memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); | |
1326 | de = tmpde; | |
1327 | } | |
1328 | ||
1329 | inode->i_ino = isofs_get_ino(ei->i_iget5_block, | |
c3ed85a3 DJ |
1330 | ei->i_iget5_offset, |
1331 | ISOFS_BUFFER_BITS(inode)); | |
1da177e4 LT |
1332 | |
1333 | /* Assume it is a normal-format file unless told otherwise */ | |
1334 | ei->i_file_format = isofs_file_normal; | |
1335 | ||
1336 | if (de->flags[-high_sierra] & 2) { | |
52b680c8 JK |
1337 | if (sbi->s_dmode != ISOFS_INVALID_MODE) |
1338 | inode->i_mode = S_IFDIR | sbi->s_dmode; | |
1339 | else | |
1340 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
bfe86848 | 1341 | set_nlink(inode, 1); /* |
c3ed85a3 DJ |
1342 | * Set to 1. We know there are 2, but |
1343 | * the find utility tries to optimize | |
1344 | * if it is 2, and it screws up. It is | |
1345 | * easier to give 1 which tells find to | |
1346 | * do it the hard way. | |
1347 | */ | |
1da177e4 | 1348 | } else { |
52b680c8 JK |
1349 | if (sbi->s_fmode != ISOFS_INVALID_MODE) { |
1350 | inode->i_mode = S_IFREG | sbi->s_fmode; | |
1351 | } else { | |
1352 | /* | |
1353 | * Set default permissions: r-x for all. The disc | |
1354 | * could be shared with DOS machines so virtually | |
1355 | * anything could be a valid executable. | |
1356 | */ | |
1357 | inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; | |
1358 | } | |
bfe86848 | 1359 | set_nlink(inode, 1); |
1da177e4 LT |
1360 | } |
1361 | inode->i_uid = sbi->s_uid; | |
1362 | inode->i_gid = sbi->s_gid; | |
ba52de12 | 1363 | inode->i_blocks = 0; |
1da177e4 LT |
1364 | |
1365 | ei->i_format_parm[0] = 0; | |
1366 | ei->i_format_parm[1] = 0; | |
1367 | ei->i_format_parm[2] = 0; | |
1368 | ||
c3ed85a3 | 1369 | ei->i_section_size = isonum_733(de->size); |
9eb7f2c6 | 1370 | if (de->flags[-high_sierra] & 0x80) { |
c4386c83 DH |
1371 | ret = isofs_read_level3_size(inode); |
1372 | if (ret < 0) | |
c3ed85a3 | 1373 | goto fail; |
c4386c83 | 1374 | ret = -EIO; |
1da177e4 LT |
1375 | } else { |
1376 | ei->i_next_section_block = 0; | |
1377 | ei->i_next_section_offset = 0; | |
c3ed85a3 | 1378 | inode->i_size = isonum_733(de->size); |
1da177e4 LT |
1379 | } |
1380 | ||
1381 | /* | |
1382 | * Some dipshit decided to store some other bit of information | |
1383 | * in the high byte of the file length. Truncate size in case | |
1384 | * this CDROM was mounted with the cruft option. | |
1385 | */ | |
1386 | ||
5404ac8e | 1387 | if (sbi->s_cruft) |
1da177e4 LT |
1388 | inode->i_size &= 0x00ffffff; |
1389 | ||
1390 | if (de->interleave[0]) { | |
c3ed85a3 | 1391 | printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); |
1da177e4 LT |
1392 | inode->i_size = 0; |
1393 | } | |
1394 | ||
1395 | /* I have no idea what file_unit_size is used for, so | |
1396 | we will flag it for now */ | |
1397 | if (de->file_unit_size[0] != 0) { | |
c3ed85a3 DJ |
1398 | printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", |
1399 | inode->i_ino); | |
1da177e4 LT |
1400 | } |
1401 | ||
1402 | /* I have no idea what other flag bits are used for, so | |
1403 | we will flag it for now */ | |
1404 | #ifdef DEBUG | |
1405 | if((de->flags[-high_sierra] & ~2)!= 0){ | |
c3ed85a3 DJ |
1406 | printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " |
1407 | "(%ld %x).\n", | |
1408 | inode->i_ino, de->flags[-high_sierra]); | |
1da177e4 LT |
1409 | } |
1410 | #endif | |
1411 | ||
1412 | inode->i_mtime.tv_sec = | |
1413 | inode->i_atime.tv_sec = | |
1414 | inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); | |
1415 | inode->i_mtime.tv_nsec = | |
1416 | inode->i_atime.tv_nsec = | |
1417 | inode->i_ctime.tv_nsec = 0; | |
1418 | ||
c3ed85a3 DJ |
1419 | ei->i_first_extent = (isonum_733(de->extent) + |
1420 | isonum_711(de->ext_attr_length)); | |
1da177e4 LT |
1421 | |
1422 | /* Set the number of blocks for stat() - should be done before RR */ | |
c3ed85a3 | 1423 | inode->i_blocks = (inode->i_size + 511) >> 9; |
1da177e4 LT |
1424 | |
1425 | /* | |
1426 | * Now test for possible Rock Ridge extensions which will override | |
1427 | * some of these numbers in the inode structure. | |
1428 | */ | |
1429 | ||
1430 | if (!high_sierra) { | |
1431 | parse_rock_ridge_inode(de, inode); | |
1432 | /* if we want uid/gid set, override the rock ridge setting */ | |
5c4a656b JK |
1433 | if (sbi->s_uid_set) |
1434 | inode->i_uid = sbi->s_uid; | |
1435 | if (sbi->s_gid_set) | |
1436 | inode->i_gid = sbi->s_gid; | |
1da177e4 | 1437 | } |
52b680c8 JK |
1438 | /* Now set final access rights if overriding rock ridge setting */ |
1439 | if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && | |
1440 | sbi->s_dmode != ISOFS_INVALID_MODE) | |
1441 | inode->i_mode = S_IFDIR | sbi->s_dmode; | |
1442 | if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && | |
1443 | sbi->s_fmode != ISOFS_INVALID_MODE) | |
1444 | inode->i_mode = S_IFREG | sbi->s_fmode; | |
1da177e4 LT |
1445 | |
1446 | /* Install the inode operations vector */ | |
1447 | if (S_ISREG(inode->i_mode)) { | |
1448 | inode->i_fop = &generic_ro_fops; | |
c3ed85a3 | 1449 | switch (ei->i_file_format) { |
1da177e4 LT |
1450 | #ifdef CONFIG_ZISOFS |
1451 | case isofs_file_compressed: | |
1452 | inode->i_data.a_ops = &zisofs_aops; | |
1453 | break; | |
1454 | #endif | |
1455 | default: | |
1456 | inode->i_data.a_ops = &isofs_aops; | |
1457 | break; | |
1458 | } | |
1459 | } else if (S_ISDIR(inode->i_mode)) { | |
1460 | inode->i_op = &isofs_dir_inode_operations; | |
1461 | inode->i_fop = &isofs_dir_operations; | |
1462 | } else if (S_ISLNK(inode->i_mode)) { | |
1463 | inode->i_op = &page_symlink_inode_operations; | |
1464 | inode->i_data.a_ops = &isofs_symlink_aops; | |
1465 | } else | |
1466 | /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ | |
1467 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
1468 | ||
c4386c83 | 1469 | ret = 0; |
9eb7f2c6 | 1470 | out: |
f99d49ad | 1471 | kfree(tmpde); |
1da177e4 LT |
1472 | if (bh) |
1473 | brelse(bh); | |
c4386c83 | 1474 | return ret; |
1da177e4 | 1475 | |
9eb7f2c6 | 1476 | out_badread: |
1da177e4 | 1477 | printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); |
9eb7f2c6 | 1478 | fail: |
1da177e4 LT |
1479 | goto out; |
1480 | } | |
1481 | ||
1482 | struct isofs_iget5_callback_data { | |
1483 | unsigned long block; | |
1484 | unsigned long offset; | |
1485 | }; | |
1486 | ||
1487 | static int isofs_iget5_test(struct inode *ino, void *data) | |
1488 | { | |
1489 | struct iso_inode_info *i = ISOFS_I(ino); | |
1490 | struct isofs_iget5_callback_data *d = | |
1491 | (struct isofs_iget5_callback_data*)data; | |
1492 | return (i->i_iget5_block == d->block) | |
c3ed85a3 | 1493 | && (i->i_iget5_offset == d->offset); |
1da177e4 LT |
1494 | } |
1495 | ||
1496 | static int isofs_iget5_set(struct inode *ino, void *data) | |
1497 | { | |
1498 | struct iso_inode_info *i = ISOFS_I(ino); | |
1499 | struct isofs_iget5_callback_data *d = | |
1500 | (struct isofs_iget5_callback_data*)data; | |
1501 | i->i_iget5_block = d->block; | |
1502 | i->i_iget5_offset = d->offset; | |
1503 | return 0; | |
1504 | } | |
1505 | ||
1506 | /* Store, in the inode's containing structure, the block and block | |
1507 | * offset that point to the underlying meta-data for the inode. The | |
1508 | * code below is otherwise similar to the iget() code in | |
1509 | * include/linux/fs.h */ | |
1510 | struct inode *isofs_iget(struct super_block *sb, | |
1511 | unsigned long block, | |
1512 | unsigned long offset) | |
1513 | { | |
1514 | unsigned long hashval; | |
1515 | struct inode *inode; | |
1516 | struct isofs_iget5_callback_data data; | |
c4386c83 | 1517 | long ret; |
1da177e4 LT |
1518 | |
1519 | if (offset >= 1ul << sb->s_blocksize_bits) | |
c4386c83 | 1520 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
1521 | |
1522 | data.block = block; | |
1523 | data.offset = offset; | |
1524 | ||
1525 | hashval = (block << sb->s_blocksize_bits) | offset; | |
1526 | ||
9eb7f2c6 | 1527 | inode = iget5_locked(sb, hashval, &isofs_iget5_test, |
c3ed85a3 | 1528 | &isofs_iget5_set, &data); |
1da177e4 | 1529 | |
c4386c83 DH |
1530 | if (!inode) |
1531 | return ERR_PTR(-ENOMEM); | |
1532 | ||
1533 | if (inode->i_state & I_NEW) { | |
1534 | ret = isofs_read_inode(inode); | |
1535 | if (ret < 0) { | |
1536 | iget_failed(inode); | |
1537 | inode = ERR_PTR(ret); | |
1538 | } else { | |
1539 | unlock_new_inode(inode); | |
1540 | } | |
1da177e4 LT |
1541 | } |
1542 | ||
1543 | return inode; | |
1544 | } | |
1545 | ||
152a0836 AV |
1546 | static struct dentry *isofs_mount(struct file_system_type *fs_type, |
1547 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1548 | { |
152a0836 | 1549 | return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); |
1da177e4 LT |
1550 | } |
1551 | ||
1552 | static struct file_system_type iso9660_fs_type = { | |
1553 | .owner = THIS_MODULE, | |
1554 | .name = "iso9660", | |
152a0836 | 1555 | .mount = isofs_mount, |
1da177e4 LT |
1556 | .kill_sb = kill_block_super, |
1557 | .fs_flags = FS_REQUIRES_DEV, | |
1558 | }; | |
1559 | ||
1560 | static int __init init_iso9660_fs(void) | |
1561 | { | |
1562 | int err = init_inodecache(); | |
1563 | if (err) | |
1564 | goto out; | |
1565 | #ifdef CONFIG_ZISOFS | |
1566 | err = zisofs_init(); | |
1567 | if (err) | |
1568 | goto out1; | |
1569 | #endif | |
1570 | err = register_filesystem(&iso9660_fs_type); | |
1571 | if (err) | |
1572 | goto out2; | |
1573 | return 0; | |
1574 | out2: | |
1575 | #ifdef CONFIG_ZISOFS | |
1576 | zisofs_cleanup(); | |
1577 | out1: | |
1578 | #endif | |
1579 | destroy_inodecache(); | |
1580 | out: | |
1581 | return err; | |
1582 | } | |
1583 | ||
1584 | static void __exit exit_iso9660_fs(void) | |
1585 | { | |
1586 | unregister_filesystem(&iso9660_fs_type); | |
1587 | #ifdef CONFIG_ZISOFS | |
1588 | zisofs_cleanup(); | |
1589 | #endif | |
1590 | destroy_inodecache(); | |
1591 | } | |
1592 | ||
1593 | module_init(init_iso9660_fs) | |
1594 | module_exit(exit_iso9660_fs) | |
1595 | MODULE_LICENSE("GPL"); | |
1596 | /* Actual filesystem name is iso9660, as requested in filesystems.c */ | |
1597 | MODULE_ALIAS("iso9660"); |