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> |
1da177e4 | 24 | |
94f2f715 | 25 | #include "isofs.h" |
1da177e4 LT |
26 | #include "zisofs.h" |
27 | ||
28 | #define BEQUIET | |
29 | ||
b1e6a015 NP |
30 | static int isofs_hashi(const struct dentry *parent, const struct inode *inode, |
31 | struct qstr *qstr); | |
32 | static int isofs_hash(const struct dentry *parent, const struct inode *inode, | |
33 | struct qstr *qstr); | |
621e155a NP |
34 | static int isofs_dentry_cmpi(const struct dentry *parent, |
35 | const struct inode *pinode, | |
36 | const struct dentry *dentry, const struct inode *inode, | |
37 | unsigned int len, const char *str, const struct qstr *name); | |
38 | static int isofs_dentry_cmp(const struct dentry *parent, | |
39 | const struct inode *pinode, | |
40 | const struct dentry *dentry, const struct inode *inode, | |
41 | unsigned int len, const char *str, const struct qstr *name); | |
1da177e4 LT |
42 | |
43 | #ifdef CONFIG_JOLIET | |
b1e6a015 NP |
44 | static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode, |
45 | struct qstr *qstr); | |
46 | static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode, | |
47 | struct qstr *qstr); | |
621e155a NP |
48 | static int isofs_dentry_cmpi_ms(const struct dentry *parent, |
49 | const struct inode *pinode, | |
50 | const struct dentry *dentry, const struct inode *inode, | |
51 | unsigned int len, const char *str, const struct qstr *name); | |
52 | static int isofs_dentry_cmp_ms(const struct dentry *parent, | |
53 | const struct inode *pinode, | |
54 | const struct dentry *dentry, const struct inode *inode, | |
55 | unsigned int len, const char *str, const struct qstr *name); | |
1da177e4 LT |
56 | #endif |
57 | ||
58 | static void isofs_put_super(struct super_block *sb) | |
59 | { | |
60 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
6cfd0148 | 61 | |
1da177e4 | 62 | #ifdef CONFIG_JOLIET |
6d729e44 | 63 | unload_nls(sbi->s_nls_iocharset); |
1da177e4 LT |
64 | #endif |
65 | ||
1da177e4 LT |
66 | kfree(sbi); |
67 | sb->s_fs_info = NULL; | |
68 | return; | |
69 | } | |
70 | ||
c4386c83 | 71 | static int isofs_read_inode(struct inode *); |
726c3342 | 72 | static int isofs_statfs (struct dentry *, struct kstatfs *); |
1da177e4 | 73 | |
e18b890b | 74 | static struct kmem_cache *isofs_inode_cachep; |
1da177e4 LT |
75 | |
76 | static struct inode *isofs_alloc_inode(struct super_block *sb) | |
77 | { | |
78 | struct iso_inode_info *ei; | |
e94b1766 | 79 | ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
80 | if (!ei) |
81 | return NULL; | |
82 | return &ei->vfs_inode; | |
83 | } | |
84 | ||
fa0d7e3d | 85 | static void isofs_i_callback(struct rcu_head *head) |
1da177e4 | 86 | { |
fa0d7e3d | 87 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
88 | kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); |
89 | } | |
90 | ||
fa0d7e3d NP |
91 | static void isofs_destroy_inode(struct inode *inode) |
92 | { | |
93 | call_rcu(&inode->i_rcu, isofs_i_callback); | |
94 | } | |
95 | ||
51cc5068 | 96 | static void init_once(void *foo) |
1da177e4 | 97 | { |
9eb7f2c6 | 98 | struct iso_inode_info *ei = foo; |
1da177e4 | 99 | |
a35afb83 | 100 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 101 | } |
c3ed85a3 | 102 | |
1da177e4 LT |
103 | static int init_inodecache(void) |
104 | { | |
105 | isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", | |
c3ed85a3 DJ |
106 | sizeof(struct iso_inode_info), |
107 | 0, (SLAB_RECLAIM_ACCOUNT| | |
108 | SLAB_MEM_SPREAD), | |
20c2df83 | 109 | init_once); |
1da177e4 LT |
110 | if (isofs_inode_cachep == NULL) |
111 | return -ENOMEM; | |
112 | return 0; | |
113 | } | |
114 | ||
115 | static void destroy_inodecache(void) | |
116 | { | |
8c0a8537 KS |
117 | /* |
118 | * Make sure all delayed rcu free inodes are flushed before we | |
119 | * destroy cache. | |
120 | */ | |
121 | rcu_barrier(); | |
1a1d92c1 | 122 | kmem_cache_destroy(isofs_inode_cachep); |
1da177e4 LT |
123 | } |
124 | ||
125 | static int isofs_remount(struct super_block *sb, int *flags, char *data) | |
126 | { | |
127 | /* we probably want a lot more here */ | |
128 | *flags |= MS_RDONLY; | |
129 | return 0; | |
130 | } | |
131 | ||
ee9b6d61 | 132 | static const struct super_operations isofs_sops = { |
1da177e4 LT |
133 | .alloc_inode = isofs_alloc_inode, |
134 | .destroy_inode = isofs_destroy_inode, | |
1da177e4 LT |
135 | .put_super = isofs_put_super, |
136 | .statfs = isofs_statfs, | |
137 | .remount_fs = isofs_remount, | |
d0132eea | 138 | .show_options = generic_show_options, |
1da177e4 LT |
139 | }; |
140 | ||
141 | ||
e16404ed | 142 | static const struct dentry_operations isofs_dentry_ops[] = { |
1da177e4 LT |
143 | { |
144 | .d_hash = isofs_hash, | |
145 | .d_compare = isofs_dentry_cmp, | |
146 | }, | |
147 | { | |
148 | .d_hash = isofs_hashi, | |
149 | .d_compare = isofs_dentry_cmpi, | |
150 | }, | |
151 | #ifdef CONFIG_JOLIET | |
152 | { | |
153 | .d_hash = isofs_hash_ms, | |
154 | .d_compare = isofs_dentry_cmp_ms, | |
155 | }, | |
156 | { | |
157 | .d_hash = isofs_hashi_ms, | |
158 | .d_compare = isofs_dentry_cmpi_ms, | |
9eb7f2c6 | 159 | }, |
1da177e4 LT |
160 | #endif |
161 | }; | |
162 | ||
163 | struct iso9660_options{ | |
5404ac8e | 164 | unsigned int rock:1; |
8711c67b | 165 | unsigned int joliet:1; |
5404ac8e JK |
166 | unsigned int cruft:1; |
167 | unsigned int hide:1; | |
168 | unsigned int showassoc:1; | |
169 | unsigned int nocompress:1; | |
170 | unsigned int overriderockperm:1; | |
171 | unsigned int uid_set:1; | |
172 | unsigned int gid_set:1; | |
173 | unsigned int utf8:1; | |
174 | unsigned char map; | |
1da177e4 LT |
175 | unsigned char check; |
176 | unsigned int blocksize; | |
7328bdd6 AV |
177 | umode_t fmode; |
178 | umode_t dmode; | |
1da177e4 LT |
179 | gid_t gid; |
180 | uid_t uid; | |
181 | char *iocharset; | |
c3ed85a3 DJ |
182 | /* LVE */ |
183 | s32 session; | |
184 | s32 sbsector; | |
1da177e4 LT |
185 | }; |
186 | ||
187 | /* | |
188 | * Compute the hash for the isofs name corresponding to the dentry. | |
189 | */ | |
190 | static int | |
b1e6a015 | 191 | isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) |
1da177e4 LT |
192 | { |
193 | const char *name; | |
194 | int len; | |
195 | ||
196 | len = qstr->len; | |
197 | name = qstr->name; | |
198 | if (ms) { | |
199 | while (len && name[len-1] == '.') | |
200 | len--; | |
201 | } | |
202 | ||
203 | qstr->hash = full_name_hash(name, len); | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Compute the hash for the isofs name corresponding to the dentry. | |
210 | */ | |
211 | static int | |
b1e6a015 | 212 | isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) |
1da177e4 LT |
213 | { |
214 | const char *name; | |
215 | int len; | |
216 | char c; | |
217 | unsigned long hash; | |
218 | ||
219 | len = qstr->len; | |
220 | name = qstr->name; | |
221 | if (ms) { | |
222 | while (len && name[len-1] == '.') | |
223 | len--; | |
224 | } | |
225 | ||
226 | hash = init_name_hash(); | |
227 | while (len--) { | |
228 | c = tolower(*name++); | |
f17e121f | 229 | hash = partial_name_hash(c, hash); |
1da177e4 LT |
230 | } |
231 | qstr->hash = end_name_hash(hash); | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
236 | /* | |
621e155a | 237 | * Compare of two isofs names. |
1da177e4 | 238 | */ |
621e155a NP |
239 | static int isofs_dentry_cmp_common( |
240 | unsigned int len, const char *str, | |
241 | const struct qstr *name, int ms, int ci) | |
1da177e4 LT |
242 | { |
243 | int alen, blen; | |
244 | ||
245 | /* A filename cannot end in '.' or we treat it like it has none */ | |
621e155a NP |
246 | alen = name->len; |
247 | blen = len; | |
1da177e4 | 248 | if (ms) { |
621e155a | 249 | while (alen && name->name[alen-1] == '.') |
1da177e4 | 250 | alen--; |
621e155a | 251 | while (blen && str[blen-1] == '.') |
1da177e4 LT |
252 | blen--; |
253 | } | |
254 | if (alen == blen) { | |
621e155a NP |
255 | if (ci) { |
256 | if (strnicmp(name->name, str, alen) == 0) | |
257 | return 0; | |
258 | } else { | |
259 | if (strncmp(name->name, str, alen) == 0) | |
260 | return 0; | |
261 | } | |
1da177e4 LT |
262 | } |
263 | return 1; | |
264 | } | |
265 | ||
266 | static int | |
b1e6a015 NP |
267 | isofs_hash(const struct dentry *dentry, const struct inode *inode, |
268 | struct qstr *qstr) | |
1da177e4 LT |
269 | { |
270 | return isofs_hash_common(dentry, qstr, 0); | |
271 | } | |
272 | ||
273 | static int | |
b1e6a015 NP |
274 | isofs_hashi(const struct dentry *dentry, const struct inode *inode, |
275 | struct qstr *qstr) | |
1da177e4 LT |
276 | { |
277 | return isofs_hashi_common(dentry, qstr, 0); | |
278 | } | |
279 | ||
280 | static int | |
621e155a NP |
281 | isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode, |
282 | const struct dentry *dentry, const struct inode *inode, | |
283 | unsigned int len, const char *str, const struct qstr *name) | |
1da177e4 | 284 | { |
621e155a | 285 | return isofs_dentry_cmp_common(len, str, name, 0, 0); |
1da177e4 LT |
286 | } |
287 | ||
288 | static int | |
621e155a NP |
289 | isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode, |
290 | const struct dentry *dentry, const struct inode *inode, | |
291 | unsigned int len, const char *str, const struct qstr *name) | |
1da177e4 | 292 | { |
621e155a | 293 | return isofs_dentry_cmp_common(len, str, name, 0, 1); |
1da177e4 LT |
294 | } |
295 | ||
296 | #ifdef CONFIG_JOLIET | |
297 | static int | |
b1e6a015 NP |
298 | isofs_hash_ms(const struct dentry *dentry, const struct inode *inode, |
299 | struct qstr *qstr) | |
1da177e4 LT |
300 | { |
301 | return isofs_hash_common(dentry, qstr, 1); | |
302 | } | |
303 | ||
304 | static int | |
b1e6a015 NP |
305 | isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode, |
306 | struct qstr *qstr) | |
1da177e4 LT |
307 | { |
308 | return isofs_hashi_common(dentry, qstr, 1); | |
309 | } | |
310 | ||
311 | static int | |
621e155a NP |
312 | isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode, |
313 | const struct dentry *dentry, const struct inode *inode, | |
314 | unsigned int len, const char *str, const struct qstr *name) | |
1da177e4 | 315 | { |
621e155a | 316 | return isofs_dentry_cmp_common(len, str, name, 1, 0); |
1da177e4 LT |
317 | } |
318 | ||
319 | static int | |
621e155a NP |
320 | isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode, |
321 | const struct dentry *dentry, const struct inode *inode, | |
322 | unsigned int len, const char *str, const struct qstr *name) | |
1da177e4 | 323 | { |
621e155a | 324 | return isofs_dentry_cmp_common(len, str, name, 1, 1); |
1da177e4 LT |
325 | } |
326 | #endif | |
327 | ||
328 | enum { | |
329 | Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, | |
330 | Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, | |
331 | Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, | |
52b680c8 | 332 | Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, |
1da177e4 LT |
333 | }; |
334 | ||
a447c093 | 335 | static const match_table_t tokens = { |
1da177e4 LT |
336 | {Opt_norock, "norock"}, |
337 | {Opt_nojoliet, "nojoliet"}, | |
338 | {Opt_unhide, "unhide"}, | |
9769f4eb JW |
339 | {Opt_hide, "hide"}, |
340 | {Opt_showassoc, "showassoc"}, | |
1da177e4 LT |
341 | {Opt_cruft, "cruft"}, |
342 | {Opt_utf8, "utf8"}, | |
343 | {Opt_iocharset, "iocharset=%s"}, | |
344 | {Opt_map_a, "map=acorn"}, | |
345 | {Opt_map_a, "map=a"}, | |
346 | {Opt_map_n, "map=normal"}, | |
347 | {Opt_map_n, "map=n"}, | |
348 | {Opt_map_o, "map=off"}, | |
349 | {Opt_map_o, "map=o"}, | |
350 | {Opt_session, "session=%u"}, | |
351 | {Opt_sb, "sbsector=%u"}, | |
352 | {Opt_check_r, "check=relaxed"}, | |
353 | {Opt_check_r, "check=r"}, | |
354 | {Opt_check_s, "check=strict"}, | |
355 | {Opt_check_s, "check=s"}, | |
356 | {Opt_uid, "uid=%u"}, | |
357 | {Opt_gid, "gid=%u"}, | |
358 | {Opt_mode, "mode=%u"}, | |
9b7880e7 | 359 | {Opt_dmode, "dmode=%u"}, |
52b680c8 | 360 | {Opt_overriderockperm, "overriderockperm"}, |
1da177e4 LT |
361 | {Opt_block, "block=%u"}, |
362 | {Opt_ignore, "conv=binary"}, | |
363 | {Opt_ignore, "conv=b"}, | |
364 | {Opt_ignore, "conv=text"}, | |
365 | {Opt_ignore, "conv=t"}, | |
366 | {Opt_ignore, "conv=mtext"}, | |
367 | {Opt_ignore, "conv=m"}, | |
368 | {Opt_ignore, "conv=auto"}, | |
369 | {Opt_ignore, "conv=a"}, | |
370 | {Opt_nocompress, "nocompress"}, | |
371 | {Opt_err, NULL} | |
372 | }; | |
373 | ||
9eb7f2c6 | 374 | static int parse_options(char *options, struct iso9660_options *popt) |
1da177e4 LT |
375 | { |
376 | char *p; | |
377 | int option; | |
378 | ||
379 | popt->map = 'n'; | |
5404ac8e JK |
380 | popt->rock = 1; |
381 | popt->joliet = 1; | |
382 | popt->cruft = 0; | |
383 | popt->hide = 0; | |
384 | popt->showassoc = 0; | |
1da177e4 LT |
385 | popt->check = 'u'; /* unset */ |
386 | popt->nocompress = 0; | |
387 | popt->blocksize = 1024; | |
52b680c8 | 388 | popt->fmode = popt->dmode = ISOFS_INVALID_MODE; |
5c4a656b JK |
389 | popt->uid_set = 0; |
390 | popt->gid_set = 0; | |
1da177e4 LT |
391 | popt->gid = 0; |
392 | popt->uid = 0; | |
393 | popt->iocharset = NULL; | |
394 | popt->utf8 = 0; | |
52b680c8 | 395 | popt->overriderockperm = 0; |
1da177e4 LT |
396 | popt->session=-1; |
397 | popt->sbsector=-1; | |
398 | if (!options) | |
399 | return 1; | |
400 | ||
401 | while ((p = strsep(&options, ",")) != NULL) { | |
402 | int token; | |
403 | substring_t args[MAX_OPT_ARGS]; | |
404 | unsigned n; | |
405 | ||
406 | if (!*p) | |
407 | continue; | |
408 | ||
409 | token = match_token(p, tokens, args); | |
410 | switch (token) { | |
411 | case Opt_norock: | |
5404ac8e | 412 | popt->rock = 0; |
1da177e4 LT |
413 | break; |
414 | case Opt_nojoliet: | |
5404ac8e | 415 | popt->joliet = 0; |
1da177e4 | 416 | break; |
9769f4eb | 417 | case Opt_hide: |
5404ac8e | 418 | popt->hide = 1; |
9769f4eb | 419 | break; |
1da177e4 | 420 | case Opt_unhide: |
9769f4eb | 421 | case Opt_showassoc: |
5404ac8e | 422 | popt->showassoc = 1; |
1da177e4 LT |
423 | break; |
424 | case Opt_cruft: | |
5404ac8e | 425 | popt->cruft = 1; |
1da177e4 LT |
426 | break; |
427 | case Opt_utf8: | |
428 | popt->utf8 = 1; | |
429 | break; | |
430 | #ifdef CONFIG_JOLIET | |
431 | case Opt_iocharset: | |
432 | popt->iocharset = match_strdup(&args[0]); | |
433 | break; | |
434 | #endif | |
435 | case Opt_map_a: | |
436 | popt->map = 'a'; | |
437 | break; | |
438 | case Opt_map_o: | |
439 | popt->map = 'o'; | |
440 | break; | |
441 | case Opt_map_n: | |
442 | popt->map = 'n'; | |
443 | break; | |
444 | case Opt_session: | |
445 | if (match_int(&args[0], &option)) | |
446 | return 0; | |
447 | n = option; | |
448 | if (n > 99) | |
449 | return 0; | |
450 | popt->session = n + 1; | |
451 | break; | |
452 | case Opt_sb: | |
453 | if (match_int(&args[0], &option)) | |
454 | return 0; | |
455 | popt->sbsector = option; | |
456 | break; | |
457 | case Opt_check_r: | |
458 | popt->check = 'r'; | |
459 | break; | |
460 | case Opt_check_s: | |
461 | popt->check = 's'; | |
462 | break; | |
463 | case Opt_ignore: | |
464 | break; | |
465 | case Opt_uid: | |
466 | if (match_int(&args[0], &option)) | |
467 | return 0; | |
468 | popt->uid = option; | |
5c4a656b | 469 | popt->uid_set = 1; |
1da177e4 LT |
470 | break; |
471 | case Opt_gid: | |
472 | if (match_int(&args[0], &option)) | |
473 | return 0; | |
474 | popt->gid = option; | |
5c4a656b | 475 | popt->gid_set = 1; |
1da177e4 LT |
476 | break; |
477 | case Opt_mode: | |
478 | if (match_int(&args[0], &option)) | |
479 | return 0; | |
9b7880e7 JK |
480 | popt->fmode = option; |
481 | break; | |
482 | case Opt_dmode: | |
483 | if (match_int(&args[0], &option)) | |
484 | return 0; | |
485 | popt->dmode = option; | |
1da177e4 | 486 | break; |
52b680c8 JK |
487 | case Opt_overriderockperm: |
488 | popt->overriderockperm = 1; | |
489 | break; | |
1da177e4 LT |
490 | case Opt_block: |
491 | if (match_int(&args[0], &option)) | |
492 | return 0; | |
493 | n = option; | |
494 | if (n != 512 && n != 1024 && n != 2048) | |
495 | return 0; | |
496 | popt->blocksize = n; | |
497 | break; | |
498 | case Opt_nocompress: | |
499 | popt->nocompress = 1; | |
500 | break; | |
501 | default: | |
502 | return 0; | |
503 | } | |
504 | } | |
505 | return 1; | |
506 | } | |
507 | ||
508 | /* | |
509 | * look if the driver can tell the multi session redirection value | |
510 | * | |
511 | * don't change this if you don't know what you do, please! | |
512 | * Multisession is legal only with XA disks. | |
513 | * A non-XA disk with more than one volume descriptor may do it right, but | |
514 | * usually is written in a nowhere standardized "multi-partition" manner. | |
515 | * Multisession uses absolute addressing (solely the first frame of the whole | |
516 | * track is #0), multi-partition uses relative addressing (each first frame of | |
517 | * each track is #0), and a track is not a session. | |
518 | * | |
519 | * A broken CDwriter software or drive firmware does not set new standards, | |
520 | * at least not if conflicting with the existing ones. | |
521 | * | |
522 | * emoenke@gwdg.de | |
523 | */ | |
524 | #define WE_OBEY_THE_WRITTEN_STANDARDS 1 | |
525 | ||
9eb7f2c6 | 526 | static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) |
1da177e4 LT |
527 | { |
528 | struct cdrom_multisession ms_info; | |
529 | unsigned int vol_desc_start; | |
530 | struct block_device *bdev = sb->s_bdev; | |
531 | int i; | |
532 | ||
533 | vol_desc_start=0; | |
534 | ms_info.addr_format=CDROM_LBA; | |
535 | if(session >= 0 && session <= 99) { | |
536 | struct cdrom_tocentry Te; | |
537 | Te.cdte_track=session; | |
538 | Te.cdte_format=CDROM_LBA; | |
539 | i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); | |
540 | if (!i) { | |
c3ed85a3 DJ |
541 | printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", |
542 | session, Te.cdte_addr.lba, | |
543 | Te.cdte_ctrl&CDROM_DATA_TRACK); | |
1da177e4 LT |
544 | if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) |
545 | return Te.cdte_addr.lba; | |
546 | } | |
c3ed85a3 DJ |
547 | |
548 | printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); | |
1da177e4 LT |
549 | } |
550 | i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); | |
9eb7f2c6 | 551 | if (session > 0) |
c3ed85a3 | 552 | printk(KERN_ERR "ISOFS: Invalid session number\n"); |
1da177e4 | 553 | #if 0 |
c3ed85a3 | 554 | printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); |
1da177e4 | 555 | if (i==0) { |
c3ed85a3 DJ |
556 | printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); |
557 | printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); | |
1da177e4 LT |
558 | } |
559 | #endif | |
560 | if (i==0) | |
561 | #if WE_OBEY_THE_WRITTEN_STANDARDS | |
c3ed85a3 | 562 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ |
1da177e4 | 563 | #endif |
c3ed85a3 | 564 | vol_desc_start=ms_info.addr.lba; |
1da177e4 LT |
565 | return vol_desc_start; |
566 | } | |
567 | ||
e45c9eff OZ |
568 | /* |
569 | * Check if root directory is empty (has less than 3 files). | |
570 | * | |
571 | * Used to detect broken CDs where ISO root directory is empty but Joliet root | |
572 | * directory is OK. If such CD has Rock Ridge extensions, they will be disabled | |
573 | * (and Joliet used instead) or else no files would be visible. | |
574 | */ | |
575 | static bool rootdir_empty(struct super_block *sb, unsigned long block) | |
576 | { | |
577 | int offset = 0, files = 0, de_len; | |
578 | struct iso_directory_record *de; | |
579 | struct buffer_head *bh; | |
580 | ||
581 | bh = sb_bread(sb, block); | |
582 | if (!bh) | |
583 | return true; | |
584 | while (files < 3) { | |
585 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
586 | de_len = *(unsigned char *) de; | |
587 | if (de_len == 0) | |
588 | break; | |
589 | files++; | |
590 | offset += de_len; | |
591 | } | |
592 | brelse(bh); | |
593 | return files < 3; | |
594 | } | |
595 | ||
1da177e4 LT |
596 | /* |
597 | * Initialize the superblock and read the root inode. | |
598 | * | |
599 | * Note: a check_disk_change() has been done immediately prior | |
600 | * to this call, so we don't need to check again. | |
601 | */ | |
602 | static int isofs_fill_super(struct super_block *s, void *data, int silent) | |
603 | { | |
c3ed85a3 DJ |
604 | struct buffer_head *bh = NULL, *pri_bh = NULL; |
605 | struct hs_primary_descriptor *h_pri = NULL; | |
606 | struct iso_primary_descriptor *pri = NULL; | |
1da177e4 | 607 | struct iso_supplementary_descriptor *sec = NULL; |
c3ed85a3 DJ |
608 | struct iso_directory_record *rootp; |
609 | struct inode *inode; | |
610 | struct iso9660_options opt; | |
611 | struct isofs_sb_info *sbi; | |
612 | unsigned long first_data_zone; | |
613 | int joliet_level = 0; | |
614 | int iso_blknum, block; | |
615 | int orig_zonesize; | |
c4386c83 | 616 | int table, error = -EINVAL; |
c3ed85a3 | 617 | unsigned int vol_desc_start; |
1da177e4 | 618 | |
d0132eea MS |
619 | save_mount_options(s, data); |
620 | ||
f8314dc6 | 621 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
4f819a78 | 622 | if (!sbi) |
1da177e4 LT |
623 | return -ENOMEM; |
624 | s->s_fs_info = sbi; | |
1da177e4 | 625 | |
9eb7f2c6 | 626 | if (!parse_options((char *)data, &opt)) |
1da177e4 LT |
627 | goto out_freesbi; |
628 | ||
629 | /* | |
630 | * First of all, get the hardware blocksize for this device. | |
631 | * If we don't know what it is, or the hardware blocksize is | |
632 | * larger than the blocksize the user specified, then use | |
633 | * that value. | |
634 | */ | |
635 | /* | |
636 | * What if bugger tells us to go beyond page size? | |
637 | */ | |
638 | opt.blocksize = sb_min_blocksize(s, opt.blocksize); | |
639 | ||
640 | sbi->s_high_sierra = 0; /* default is iso9660 */ | |
641 | ||
642 | vol_desc_start = (opt.sbsector != -1) ? | |
643 | opt.sbsector : isofs_get_last_session(s,opt.session); | |
644 | ||
c3ed85a3 DJ |
645 | for (iso_blknum = vol_desc_start+16; |
646 | iso_blknum < vol_desc_start+100; iso_blknum++) { | |
647 | struct hs_volume_descriptor *hdp; | |
648 | struct iso_volume_descriptor *vdp; | |
649 | ||
650 | block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); | |
651 | if (!(bh = sb_bread(s, block))) | |
652 | goto out_no_read; | |
653 | ||
654 | vdp = (struct iso_volume_descriptor *)bh->b_data; | |
655 | hdp = (struct hs_volume_descriptor *)bh->b_data; | |
656 | ||
657 | /* | |
658 | * Due to the overlapping physical location of the descriptors, | |
659 | * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure | |
660 | * proper identification in this case, we first check for ISO. | |
661 | */ | |
662 | if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { | |
663 | if (isonum_711(vdp->type) == ISO_VD_END) | |
664 | break; | |
665 | if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { | |
666 | if (pri == NULL) { | |
667 | pri = (struct iso_primary_descriptor *)vdp; | |
668 | /* Save the buffer in case we need it ... */ | |
669 | pri_bh = bh; | |
670 | bh = NULL; | |
671 | } | |
672 | } | |
1da177e4 | 673 | #ifdef CONFIG_JOLIET |
c3ed85a3 DJ |
674 | else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { |
675 | sec = (struct iso_supplementary_descriptor *)vdp; | |
676 | if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { | |
8711c67b | 677 | if (opt.joliet) { |
c3ed85a3 DJ |
678 | if (sec->escape[2] == 0x40) |
679 | joliet_level = 1; | |
680 | else if (sec->escape[2] == 0x43) | |
681 | joliet_level = 2; | |
682 | else if (sec->escape[2] == 0x45) | |
683 | joliet_level = 3; | |
684 | ||
685 | printk(KERN_DEBUG "ISO 9660 Extensions: " | |
686 | "Microsoft Joliet Level %d\n", | |
687 | joliet_level); | |
688 | } | |
689 | goto root_found; | |
690 | } else { | |
691 | /* Unknown supplementary volume descriptor */ | |
692 | sec = NULL; | |
693 | } | |
1da177e4 | 694 | } |
1da177e4 | 695 | #endif |
c3ed85a3 DJ |
696 | } else { |
697 | if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { | |
698 | if (isonum_711(hdp->type) != ISO_VD_PRIMARY) | |
699 | goto out_freebh; | |
700 | ||
701 | sbi->s_high_sierra = 1; | |
5404ac8e | 702 | opt.rock = 0; |
c3ed85a3 DJ |
703 | h_pri = (struct hs_primary_descriptor *)vdp; |
704 | goto root_found; | |
705 | } | |
1da177e4 | 706 | } |
1da177e4 | 707 | |
c3ed85a3 | 708 | /* Just skip any volume descriptors we don't recognize */ |
1da177e4 | 709 | |
c3ed85a3 DJ |
710 | brelse(bh); |
711 | bh = NULL; | |
1da177e4 LT |
712 | } |
713 | /* | |
714 | * If we fall through, either no volume descriptor was found, | |
715 | * or else we passed a primary descriptor looking for others. | |
716 | */ | |
717 | if (!pri) | |
718 | goto out_unknown_format; | |
719 | brelse(bh); | |
720 | bh = pri_bh; | |
721 | pri_bh = NULL; | |
722 | ||
723 | root_found: | |
724 | ||
5404ac8e | 725 | if (joliet_level && (pri == NULL || !opt.rock)) { |
c3ed85a3 DJ |
726 | /* This is the case of Joliet with the norock mount flag. |
727 | * A disc with both Joliet and Rock Ridge is handled later | |
728 | */ | |
729 | pri = (struct iso_primary_descriptor *) sec; | |
1da177e4 LT |
730 | } |
731 | ||
732 | if(sbi->s_high_sierra){ | |
c3ed85a3 DJ |
733 | rootp = (struct iso_directory_record *) h_pri->root_directory_record; |
734 | sbi->s_nzones = isonum_733(h_pri->volume_space_size); | |
735 | sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); | |
736 | sbi->s_max_size = isonum_733(h_pri->volume_space_size); | |
1da177e4 | 737 | } else { |
c3ed85a3 DJ |
738 | if (!pri) |
739 | goto out_freebh; | |
740 | rootp = (struct iso_directory_record *) pri->root_directory_record; | |
741 | sbi->s_nzones = isonum_733(pri->volume_space_size); | |
742 | sbi->s_log_zone_size = isonum_723(pri->logical_block_size); | |
743 | sbi->s_max_size = isonum_733(pri->volume_space_size); | |
1da177e4 LT |
744 | } |
745 | ||
746 | sbi->s_ninodes = 0; /* No way to figure this out easily */ | |
747 | ||
748 | orig_zonesize = sbi->s_log_zone_size; | |
749 | /* | |
750 | * If the zone size is smaller than the hardware sector size, | |
751 | * this is a fatal error. This would occur if the disc drive | |
752 | * had sectors that were 2048 bytes, but the filesystem had | |
753 | * blocks that were 512 bytes (which should only very rarely | |
754 | * happen.) | |
755 | */ | |
c3ed85a3 | 756 | if (orig_zonesize < opt.blocksize) |
1da177e4 LT |
757 | goto out_bad_size; |
758 | ||
759 | /* RDE: convert log zone size to bit shift */ | |
c3ed85a3 DJ |
760 | switch (sbi->s_log_zone_size) { |
761 | case 512: sbi->s_log_zone_size = 9; break; | |
762 | case 1024: sbi->s_log_zone_size = 10; break; | |
763 | case 2048: sbi->s_log_zone_size = 11; break; | |
1da177e4 | 764 | |
c3ed85a3 | 765 | default: |
1da177e4 | 766 | goto out_bad_zone_size; |
c3ed85a3 | 767 | } |
1da177e4 LT |
768 | |
769 | s->s_magic = ISOFS_SUPER_MAGIC; | |
66a362a2 JA |
770 | |
771 | /* | |
772 | * With multi-extent files, file size is only limited by the maximum | |
773 | * size of a file system, which is 8 TB. | |
774 | */ | |
775 | s->s_maxbytes = 0x80000000000LL; | |
1da177e4 | 776 | |
c3ed85a3 DJ |
777 | /* |
778 | * The CDROM is read-only, has no nodes (devices) on it, and since | |
779 | * all of the files appear to be owned by root, we really do not want | |
780 | * to allow suid. (suid or devices will not show up unless we have | |
781 | * Rock Ridge extensions) | |
782 | */ | |
1da177e4 LT |
783 | |
784 | s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */; | |
785 | ||
786 | /* Set this for reference. Its not currently used except on write | |
787 | which we don't have .. */ | |
c3ed85a3 DJ |
788 | |
789 | first_data_zone = isonum_733(rootp->extent) + | |
790 | isonum_711(rootp->ext_attr_length); | |
1da177e4 LT |
791 | sbi->s_firstdatazone = first_data_zone; |
792 | #ifndef BEQUIET | |
c3ed85a3 DJ |
793 | printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", |
794 | sbi->s_max_size, 1UL << sbi->s_log_zone_size); | |
795 | printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); | |
1da177e4 | 796 | if(sbi->s_high_sierra) |
c3ed85a3 | 797 | printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); |
1da177e4 LT |
798 | #endif |
799 | ||
800 | /* | |
801 | * If the Joliet level is set, we _may_ decide to use the | |
802 | * secondary descriptor, but can't be sure until after we | |
803 | * read the root inode. But before reading the root inode | |
804 | * we may need to change the device blocksize, and would | |
805 | * rather release the old buffer first. So, we cache the | |
806 | * first_data_zone value from the secondary descriptor. | |
807 | */ | |
808 | if (joliet_level) { | |
809 | pri = (struct iso_primary_descriptor *) sec; | |
810 | rootp = (struct iso_directory_record *) | |
811 | pri->root_directory_record; | |
c3ed85a3 DJ |
812 | first_data_zone = isonum_733(rootp->extent) + |
813 | isonum_711(rootp->ext_attr_length); | |
1da177e4 LT |
814 | } |
815 | ||
816 | /* | |
817 | * We're all done using the volume descriptor, and may need | |
818 | * to change the device blocksize, so release the buffer now. | |
819 | */ | |
820 | brelse(pri_bh); | |
821 | brelse(bh); | |
822 | ||
823 | /* | |
824 | * Force the blocksize to 512 for 512 byte sectors. The file | |
825 | * read primitives really get it wrong in a bad way if we don't | |
826 | * do this. | |
827 | * | |
828 | * Note - we should never be setting the blocksize to something | |
829 | * less than the hardware sector size for the device. If we | |
830 | * do, we would end up having to read larger buffers and split | |
831 | * out portions to satisfy requests. | |
832 | * | |
833 | * Note2- the idea here is that we want to deal with the optimal | |
834 | * zonesize in the filesystem. If we have it set to something less, | |
835 | * then we have horrible problems with trying to piece together | |
836 | * bits of adjacent blocks in order to properly read directory | |
837 | * entries. By forcing the blocksize in this way, we ensure | |
838 | * that we will never be required to do this. | |
839 | */ | |
840 | sb_set_blocksize(s, orig_zonesize); | |
841 | ||
842 | sbi->s_nls_iocharset = NULL; | |
843 | ||
844 | #ifdef CONFIG_JOLIET | |
845 | if (joliet_level && opt.utf8 == 0) { | |
c3ed85a3 | 846 | char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; |
1da177e4 LT |
847 | sbi->s_nls_iocharset = load_nls(p); |
848 | if (! sbi->s_nls_iocharset) { | |
849 | /* Fail only if explicit charset specified */ | |
850 | if (opt.iocharset) | |
851 | goto out_freesbi; | |
852 | sbi->s_nls_iocharset = load_nls_default(); | |
853 | } | |
854 | } | |
855 | #endif | |
856 | s->s_op = &isofs_sops; | |
857 | s->s_export_op = &isofs_export_ops; | |
858 | sbi->s_mapping = opt.map; | |
5404ac8e | 859 | sbi->s_rock = (opt.rock ? 2 : 0); |
1da177e4 LT |
860 | sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ |
861 | sbi->s_cruft = opt.cruft; | |
9769f4eb JW |
862 | sbi->s_hide = opt.hide; |
863 | sbi->s_showassoc = opt.showassoc; | |
1da177e4 LT |
864 | sbi->s_uid = opt.uid; |
865 | sbi->s_gid = opt.gid; | |
5c4a656b JK |
866 | sbi->s_uid_set = opt.uid_set; |
867 | sbi->s_gid_set = opt.gid_set; | |
1da177e4 LT |
868 | sbi->s_utf8 = opt.utf8; |
869 | sbi->s_nocompress = opt.nocompress; | |
52b680c8 | 870 | sbi->s_overriderockperm = opt.overriderockperm; |
1da177e4 LT |
871 | /* |
872 | * It would be incredibly stupid to allow people to mark every file | |
873 | * on the disk as suid, so we merely allow them to set the default | |
874 | * permissions. | |
875 | */ | |
52b680c8 JK |
876 | if (opt.fmode != ISOFS_INVALID_MODE) |
877 | sbi->s_fmode = opt.fmode & 0777; | |
878 | else | |
879 | sbi->s_fmode = ISOFS_INVALID_MODE; | |
880 | if (opt.dmode != ISOFS_INVALID_MODE) | |
881 | sbi->s_dmode = opt.dmode & 0777; | |
882 | else | |
883 | sbi->s_dmode = ISOFS_INVALID_MODE; | |
1da177e4 LT |
884 | |
885 | /* | |
886 | * Read the root inode, which _may_ result in changing | |
887 | * the s_rock flag. Once we have the final s_rock value, | |
888 | * we then decide whether to use the Joliet descriptor. | |
889 | */ | |
890 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
c4386c83 DH |
891 | if (IS_ERR(inode)) |
892 | goto out_no_root; | |
1da177e4 | 893 | |
e45c9eff OZ |
894 | /* |
895 | * Fix for broken CDs with Rock Ridge and empty ISO root directory but | |
896 | * correct Joliet root directory. | |
897 | */ | |
898 | if (sbi->s_rock == 1 && joliet_level && | |
899 | rootdir_empty(s, sbi->s_firstdatazone)) { | |
900 | printk(KERN_NOTICE | |
901 | "ISOFS: primary root directory is empty. " | |
902 | "Disabling Rock Ridge and switching to Joliet."); | |
903 | sbi->s_rock = 0; | |
904 | } | |
905 | ||
1da177e4 LT |
906 | /* |
907 | * If this disk has both Rock Ridge and Joliet on it, then we | |
908 | * want to use Rock Ridge by default. This can be overridden | |
909 | * by using the norock mount option. There is still one other | |
910 | * possibility that is not taken into account: a Rock Ridge | |
911 | * CD with Unicode names. Until someone sees such a beast, it | |
912 | * will not be supported. | |
913 | */ | |
914 | if (sbi->s_rock == 1) { | |
915 | joliet_level = 0; | |
916 | } else if (joliet_level) { | |
917 | sbi->s_rock = 0; | |
918 | if (sbi->s_firstdatazone != first_data_zone) { | |
919 | sbi->s_firstdatazone = first_data_zone; | |
c3ed85a3 | 920 | printk(KERN_DEBUG |
1da177e4 LT |
921 | "ISOFS: changing to secondary root\n"); |
922 | iput(inode); | |
923 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
c4386c83 DH |
924 | if (IS_ERR(inode)) |
925 | goto out_no_root; | |
1da177e4 LT |
926 | } |
927 | } | |
928 | ||
929 | if (opt.check == 'u') { | |
930 | /* Only Joliet is case insensitive by default */ | |
c3ed85a3 DJ |
931 | if (joliet_level) |
932 | opt.check = 'r'; | |
933 | else | |
934 | opt.check = 's'; | |
1da177e4 LT |
935 | } |
936 | sbi->s_joliet_level = joliet_level; | |
937 | ||
817794e0 KK |
938 | /* Make sure the root inode is a directory */ |
939 | if (!S_ISDIR(inode->i_mode)) { | |
940 | printk(KERN_WARNING | |
941 | "isofs_fill_super: root inode is not a directory. " | |
942 | "Corrupted media?\n"); | |
943 | goto out_iput; | |
944 | } | |
945 | ||
1da177e4 | 946 | table = 0; |
c3ed85a3 DJ |
947 | if (joliet_level) |
948 | table += 2; | |
949 | if (opt.check == 'r') | |
950 | table++; | |
6cc9c1d2 AV |
951 | |
952 | s->s_d_op = &isofs_dentry_ops[table]; | |
953 | ||
954 | /* get the root dentry */ | |
48fde701 | 955 | s->s_root = d_make_root(inode); |
8fdd8c49 | 956 | if (!(s->s_root)) { |
8fdd8c49 AV |
957 | error = -ENOMEM; |
958 | goto out_no_inode; | |
959 | } | |
1da177e4 | 960 | |
f99d49ad | 961 | kfree(opt.iocharset); |
1da177e4 LT |
962 | |
963 | return 0; | |
964 | ||
965 | /* | |
966 | * Display error messages and free resources. | |
967 | */ | |
1da177e4 LT |
968 | out_iput: |
969 | iput(inode); | |
c4386c83 DH |
970 | goto out_no_inode; |
971 | out_no_root: | |
972 | error = PTR_ERR(inode); | |
973 | if (error != -ENOMEM) | |
974 | printk(KERN_WARNING "%s: get root inode failed\n", __func__); | |
975 | out_no_inode: | |
1da177e4 | 976 | #ifdef CONFIG_JOLIET |
6d729e44 | 977 | unload_nls(sbi->s_nls_iocharset); |
1da177e4 LT |
978 | #endif |
979 | goto out_freesbi; | |
980 | out_no_read: | |
c3ed85a3 DJ |
981 | printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", |
982 | __func__, s->s_id, iso_blknum, block); | |
c11760c6 | 983 | goto out_freebh; |
1da177e4 | 984 | out_bad_zone_size: |
c3ed85a3 | 985 | printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", |
1da177e4 LT |
986 | sbi->s_log_zone_size); |
987 | goto out_freebh; | |
988 | out_bad_size: | |
c3ed85a3 | 989 | printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", |
1da177e4 LT |
990 | orig_zonesize, opt.blocksize); |
991 | goto out_freebh; | |
992 | out_unknown_format: | |
993 | if (!silent) | |
c3ed85a3 | 994 | printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); |
1da177e4 LT |
995 | |
996 | out_freebh: | |
997 | brelse(bh); | |
c11760c6 | 998 | brelse(pri_bh); |
1da177e4 | 999 | out_freesbi: |
f99d49ad | 1000 | kfree(opt.iocharset); |
1da177e4 LT |
1001 | kfree(sbi); |
1002 | s->s_fs_info = NULL; | |
c4386c83 | 1003 | return error; |
1da177e4 LT |
1004 | } |
1005 | ||
726c3342 | 1006 | static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 1007 | { |
726c3342 | 1008 | struct super_block *sb = dentry->d_sb; |
2430c4da | 1009 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
726c3342 | 1010 | |
1da177e4 LT |
1011 | buf->f_type = ISOFS_SUPER_MAGIC; |
1012 | buf->f_bsize = sb->s_blocksize; | |
1013 | buf->f_blocks = (ISOFS_SB(sb)->s_nzones | |
c3ed85a3 | 1014 | << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); |
1da177e4 LT |
1015 | buf->f_bfree = 0; |
1016 | buf->f_bavail = 0; | |
1017 | buf->f_files = ISOFS_SB(sb)->s_ninodes; | |
1018 | buf->f_ffree = 0; | |
2430c4da CL |
1019 | buf->f_fsid.val[0] = (u32)id; |
1020 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
1021 | buf->f_namelen = NAME_MAX; |
1022 | return 0; | |
1023 | } | |
1024 | ||
1025 | /* | |
1026 | * Get a set of blocks; filling in buffer_heads if already allocated | |
1027 | * or getblk() if they are not. Returns the number of blocks inserted | |
c4386c83 | 1028 | * (-ve == error.) |
1da177e4 | 1029 | */ |
fde214d4 | 1030 | int isofs_get_blocks(struct inode *inode, sector_t iblock, |
1da177e4 LT |
1031 | struct buffer_head **bh, unsigned long nblocks) |
1032 | { | |
fde214d4 | 1033 | unsigned long b_off = iblock; |
1da177e4 LT |
1034 | unsigned offset, sect_size; |
1035 | unsigned int firstext; | |
1036 | unsigned long nextblk, nextoff; | |
c4386c83 | 1037 | int section, rv, error; |
1da177e4 LT |
1038 | struct iso_inode_info *ei = ISOFS_I(inode); |
1039 | ||
c4386c83 | 1040 | error = -EIO; |
1da177e4 | 1041 | rv = 0; |
fde214d4 | 1042 | if (iblock != b_off) { |
c3ed85a3 | 1043 | printk(KERN_DEBUG "%s: block number too large\n", __func__); |
1da177e4 LT |
1044 | goto abort; |
1045 | } | |
1046 | ||
c3ed85a3 DJ |
1047 | |
1048 | offset = 0; | |
1049 | firstext = ei->i_first_extent; | |
1da177e4 | 1050 | sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); |
c3ed85a3 DJ |
1051 | nextblk = ei->i_next_section_block; |
1052 | nextoff = ei->i_next_section_offset; | |
1053 | section = 0; | |
1da177e4 | 1054 | |
c3ed85a3 | 1055 | while (nblocks) { |
1da177e4 LT |
1056 | /* If we are *way* beyond the end of the file, print a message. |
1057 | * Access beyond the end of the file up to the next page boundary | |
1058 | * is normal, however because of the way the page cache works. | |
1059 | * In this case, we just return 0 so that we can properly fill | |
1060 | * the page with useless information without generating any | |
1061 | * I/O errors. | |
1062 | */ | |
1063 | if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { | |
fde214d4 JK |
1064 | printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", |
1065 | __func__, b_off, | |
1066 | (unsigned long long)inode->i_size); | |
1da177e4 LT |
1067 | goto abort; |
1068 | } | |
c3ed85a3 | 1069 | |
fb50ae74 JRV |
1070 | /* On the last section, nextblk == 0, section size is likely to |
1071 | * exceed sect_size by a partial block, and access beyond the | |
1072 | * end of the file will reach beyond the section size, too. | |
1073 | */ | |
1074 | while (nextblk && (b_off >= (offset + sect_size))) { | |
1075 | struct inode *ninode; | |
1076 | ||
1077 | offset += sect_size; | |
1078 | ninode = isofs_iget(inode->i_sb, nextblk, nextoff); | |
c4386c83 DH |
1079 | if (IS_ERR(ninode)) { |
1080 | error = PTR_ERR(ninode); | |
fb50ae74 | 1081 | goto abort; |
c4386c83 | 1082 | } |
fb50ae74 JRV |
1083 | firstext = ISOFS_I(ninode)->i_first_extent; |
1084 | sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); | |
1085 | nextblk = ISOFS_I(ninode)->i_next_section_block; | |
1086 | nextoff = ISOFS_I(ninode)->i_next_section_offset; | |
1087 | iput(ninode); | |
1088 | ||
1089 | if (++section > 100) { | |
c3ed85a3 DJ |
1090 | printk(KERN_DEBUG "%s: More than 100 file sections ?!?" |
1091 | " aborting...\n", __func__); | |
fde214d4 | 1092 | printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " |
c3ed85a3 | 1093 | "nextblk=%lu nextoff=%lu\n", __func__, |
fde214d4 | 1094 | b_off, firstext, (unsigned) sect_size, |
c3ed85a3 | 1095 | nextblk, nextoff); |
fb50ae74 | 1096 | goto abort; |
1da177e4 LT |
1097 | } |
1098 | } | |
c3ed85a3 DJ |
1099 | |
1100 | if (*bh) { | |
1da177e4 LT |
1101 | map_bh(*bh, inode->i_sb, firstext + b_off - offset); |
1102 | } else { | |
1103 | *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); | |
c3ed85a3 | 1104 | if (!*bh) |
1da177e4 LT |
1105 | goto abort; |
1106 | } | |
1107 | bh++; /* Next buffer head */ | |
1108 | b_off++; /* Next buffer offset */ | |
1109 | nblocks--; | |
1110 | rv++; | |
1111 | } | |
1112 | ||
c4386c83 | 1113 | error = 0; |
1da177e4 | 1114 | abort: |
c4386c83 | 1115 | return rv != 0 ? rv : error; |
1da177e4 LT |
1116 | } |
1117 | ||
1118 | /* | |
1119 | * Used by the standard interfaces. | |
1120 | */ | |
1121 | static int isofs_get_block(struct inode *inode, sector_t iblock, | |
1122 | struct buffer_head *bh_result, int create) | |
1123 | { | |
c4386c83 DH |
1124 | int ret; |
1125 | ||
9eb7f2c6 | 1126 | if (create) { |
c3ed85a3 | 1127 | printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); |
1da177e4 LT |
1128 | return -EROFS; |
1129 | } | |
1130 | ||
c4386c83 DH |
1131 | ret = isofs_get_blocks(inode, iblock, &bh_result, 1); |
1132 | return ret < 0 ? ret : 0; | |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | static int isofs_bmap(struct inode *inode, sector_t block) | |
1136 | { | |
1137 | struct buffer_head dummy; | |
1138 | int error; | |
1139 | ||
1140 | dummy.b_state = 0; | |
1141 | dummy.b_blocknr = -1000; | |
1142 | error = isofs_get_block(inode, block, &dummy, 0); | |
1143 | if (!error) | |
1144 | return dummy.b_blocknr; | |
1145 | return 0; | |
1146 | } | |
1147 | ||
1148 | struct buffer_head *isofs_bread(struct inode *inode, sector_t block) | |
1149 | { | |
1150 | sector_t blknr = isofs_bmap(inode, block); | |
1151 | if (!blknr) | |
1152 | return NULL; | |
1153 | return sb_bread(inode->i_sb, blknr); | |
1154 | } | |
1155 | ||
1156 | static int isofs_readpage(struct file *file, struct page *page) | |
1157 | { | |
3069083c NJ |
1158 | return mpage_readpage(page, isofs_get_block); |
1159 | } | |
1160 | ||
1161 | static int isofs_readpages(struct file *file, struct address_space *mapping, | |
1162 | struct list_head *pages, unsigned nr_pages) | |
1163 | { | |
1164 | return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); | |
1da177e4 LT |
1165 | } |
1166 | ||
1167 | static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) | |
1168 | { | |
1169 | return generic_block_bmap(mapping,block,isofs_get_block); | |
1170 | } | |
1171 | ||
f5e54d6e | 1172 | static const struct address_space_operations isofs_aops = { |
1da177e4 | 1173 | .readpage = isofs_readpage, |
3069083c | 1174 | .readpages = isofs_readpages, |
1da177e4 LT |
1175 | .bmap = _isofs_bmap |
1176 | }; | |
1177 | ||
9eb7f2c6 | 1178 | static int isofs_read_level3_size(struct inode *inode) |
1da177e4 LT |
1179 | { |
1180 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1181 | int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; | |
c3ed85a3 | 1182 | struct buffer_head *bh = NULL; |
1da177e4 LT |
1183 | unsigned long block, offset, block_saved, offset_saved; |
1184 | int i = 0; | |
1185 | int more_entries = 0; | |
c3ed85a3 | 1186 | struct iso_directory_record *tmpde = NULL; |
1da177e4 LT |
1187 | struct iso_inode_info *ei = ISOFS_I(inode); |
1188 | ||
1189 | inode->i_size = 0; | |
1190 | ||
1191 | /* The first 16 blocks are reserved as the System Area. Thus, | |
1192 | * no inodes can appear in block 0. We use this to flag that | |
1193 | * this is the last section. */ | |
1194 | ei->i_next_section_block = 0; | |
1195 | ei->i_next_section_offset = 0; | |
1196 | ||
1197 | block = ei->i_iget5_block; | |
1198 | offset = ei->i_iget5_offset; | |
1199 | ||
1200 | do { | |
c3ed85a3 | 1201 | struct iso_directory_record *de; |
1da177e4 LT |
1202 | unsigned int de_len; |
1203 | ||
1204 | if (!bh) { | |
1205 | bh = sb_bread(inode->i_sb, block); | |
1206 | if (!bh) | |
1207 | goto out_noread; | |
1208 | } | |
1209 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1210 | de_len = *(unsigned char *) de; | |
1211 | ||
1212 | if (de_len == 0) { | |
1213 | brelse(bh); | |
1214 | bh = NULL; | |
1215 | ++block; | |
1216 | offset = 0; | |
1217 | continue; | |
1218 | } | |
1219 | ||
1220 | block_saved = block; | |
1221 | offset_saved = offset; | |
1222 | offset += de_len; | |
1223 | ||
1224 | /* Make sure we have a full directory entry */ | |
1225 | if (offset >= bufsize) { | |
1226 | int slop = bufsize - offset + de_len; | |
1227 | if (!tmpde) { | |
1228 | tmpde = kmalloc(256, GFP_KERNEL); | |
1229 | if (!tmpde) | |
1230 | goto out_nomem; | |
1231 | } | |
1232 | memcpy(tmpde, de, slop); | |
1233 | offset &= bufsize - 1; | |
1234 | block++; | |
1235 | brelse(bh); | |
1236 | bh = NULL; | |
1237 | if (offset) { | |
1238 | bh = sb_bread(inode->i_sb, block); | |
1239 | if (!bh) | |
1240 | goto out_noread; | |
9eb7f2c6 | 1241 | memcpy((void *)tmpde+slop, bh->b_data, offset); |
1da177e4 LT |
1242 | } |
1243 | de = tmpde; | |
1244 | } | |
1245 | ||
1246 | inode->i_size += isonum_733(de->size); | |
1247 | if (i == 1) { | |
1248 | ei->i_next_section_block = block_saved; | |
1249 | ei->i_next_section_offset = offset_saved; | |
1250 | } | |
1251 | ||
1252 | more_entries = de->flags[-high_sierra] & 0x80; | |
1253 | ||
1254 | i++; | |
9eb7f2c6 | 1255 | if (i > 100) |
1da177e4 | 1256 | goto out_toomany; |
9eb7f2c6 | 1257 | } while (more_entries); |
1da177e4 | 1258 | out: |
9eb7f2c6 | 1259 | kfree(tmpde); |
1da177e4 LT |
1260 | if (bh) |
1261 | brelse(bh); | |
1262 | return 0; | |
1263 | ||
1264 | out_nomem: | |
1265 | if (bh) | |
1266 | brelse(bh); | |
1267 | return -ENOMEM; | |
1268 | ||
1269 | out_noread: | |
1270 | printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); | |
f99d49ad | 1271 | kfree(tmpde); |
1da177e4 LT |
1272 | return -EIO; |
1273 | ||
1274 | out_toomany: | |
c3ed85a3 DJ |
1275 | printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" |
1276 | "isofs_read_level3_size: inode=%lu\n", | |
1277 | __func__, inode->i_ino); | |
1da177e4 LT |
1278 | goto out; |
1279 | } | |
1280 | ||
c4386c83 | 1281 | static int isofs_read_inode(struct inode *inode) |
1da177e4 LT |
1282 | { |
1283 | struct super_block *sb = inode->i_sb; | |
1284 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
1285 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1286 | unsigned long block; | |
1287 | int high_sierra = sbi->s_high_sierra; | |
c3ed85a3 DJ |
1288 | struct buffer_head *bh = NULL; |
1289 | struct iso_directory_record *de; | |
1290 | struct iso_directory_record *tmpde = NULL; | |
1da177e4 LT |
1291 | unsigned int de_len; |
1292 | unsigned long offset; | |
1293 | struct iso_inode_info *ei = ISOFS_I(inode); | |
c4386c83 | 1294 | int ret = -EIO; |
1da177e4 LT |
1295 | |
1296 | block = ei->i_iget5_block; | |
1297 | bh = sb_bread(inode->i_sb, block); | |
1298 | if (!bh) | |
1299 | goto out_badread; | |
1300 | ||
1301 | offset = ei->i_iget5_offset; | |
1302 | ||
1303 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1304 | de_len = *(unsigned char *) de; | |
1305 | ||
1306 | if (offset + de_len > bufsize) { | |
1307 | int frag1 = bufsize - offset; | |
1308 | ||
1309 | tmpde = kmalloc(de_len, GFP_KERNEL); | |
1310 | if (tmpde == NULL) { | |
c3ed85a3 | 1311 | printk(KERN_INFO "%s: out of memory\n", __func__); |
c4386c83 | 1312 | ret = -ENOMEM; |
1da177e4 LT |
1313 | goto fail; |
1314 | } | |
1315 | memcpy(tmpde, bh->b_data + offset, frag1); | |
1316 | brelse(bh); | |
1317 | bh = sb_bread(inode->i_sb, ++block); | |
1318 | if (!bh) | |
1319 | goto out_badread; | |
1320 | memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); | |
1321 | de = tmpde; | |
1322 | } | |
1323 | ||
1324 | inode->i_ino = isofs_get_ino(ei->i_iget5_block, | |
c3ed85a3 DJ |
1325 | ei->i_iget5_offset, |
1326 | ISOFS_BUFFER_BITS(inode)); | |
1da177e4 LT |
1327 | |
1328 | /* Assume it is a normal-format file unless told otherwise */ | |
1329 | ei->i_file_format = isofs_file_normal; | |
1330 | ||
1331 | if (de->flags[-high_sierra] & 2) { | |
52b680c8 JK |
1332 | if (sbi->s_dmode != ISOFS_INVALID_MODE) |
1333 | inode->i_mode = S_IFDIR | sbi->s_dmode; | |
1334 | else | |
1335 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
bfe86848 | 1336 | set_nlink(inode, 1); /* |
c3ed85a3 DJ |
1337 | * Set to 1. We know there are 2, but |
1338 | * the find utility tries to optimize | |
1339 | * if it is 2, and it screws up. It is | |
1340 | * easier to give 1 which tells find to | |
1341 | * do it the hard way. | |
1342 | */ | |
1da177e4 | 1343 | } else { |
52b680c8 JK |
1344 | if (sbi->s_fmode != ISOFS_INVALID_MODE) { |
1345 | inode->i_mode = S_IFREG | sbi->s_fmode; | |
1346 | } else { | |
1347 | /* | |
1348 | * Set default permissions: r-x for all. The disc | |
1349 | * could be shared with DOS machines so virtually | |
1350 | * anything could be a valid executable. | |
1351 | */ | |
1352 | inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; | |
1353 | } | |
bfe86848 | 1354 | set_nlink(inode, 1); |
1da177e4 LT |
1355 | } |
1356 | inode->i_uid = sbi->s_uid; | |
1357 | inode->i_gid = sbi->s_gid; | |
ba52de12 | 1358 | inode->i_blocks = 0; |
1da177e4 LT |
1359 | |
1360 | ei->i_format_parm[0] = 0; | |
1361 | ei->i_format_parm[1] = 0; | |
1362 | ei->i_format_parm[2] = 0; | |
1363 | ||
c3ed85a3 | 1364 | ei->i_section_size = isonum_733(de->size); |
9eb7f2c6 | 1365 | if (de->flags[-high_sierra] & 0x80) { |
c4386c83 DH |
1366 | ret = isofs_read_level3_size(inode); |
1367 | if (ret < 0) | |
c3ed85a3 | 1368 | goto fail; |
c4386c83 | 1369 | ret = -EIO; |
1da177e4 LT |
1370 | } else { |
1371 | ei->i_next_section_block = 0; | |
1372 | ei->i_next_section_offset = 0; | |
c3ed85a3 | 1373 | inode->i_size = isonum_733(de->size); |
1da177e4 LT |
1374 | } |
1375 | ||
1376 | /* | |
1377 | * Some dipshit decided to store some other bit of information | |
1378 | * in the high byte of the file length. Truncate size in case | |
1379 | * this CDROM was mounted with the cruft option. | |
1380 | */ | |
1381 | ||
5404ac8e | 1382 | if (sbi->s_cruft) |
1da177e4 LT |
1383 | inode->i_size &= 0x00ffffff; |
1384 | ||
1385 | if (de->interleave[0]) { | |
c3ed85a3 | 1386 | printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); |
1da177e4 LT |
1387 | inode->i_size = 0; |
1388 | } | |
1389 | ||
1390 | /* I have no idea what file_unit_size is used for, so | |
1391 | we will flag it for now */ | |
1392 | if (de->file_unit_size[0] != 0) { | |
c3ed85a3 DJ |
1393 | printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", |
1394 | inode->i_ino); | |
1da177e4 LT |
1395 | } |
1396 | ||
1397 | /* I have no idea what other flag bits are used for, so | |
1398 | we will flag it for now */ | |
1399 | #ifdef DEBUG | |
1400 | if((de->flags[-high_sierra] & ~2)!= 0){ | |
c3ed85a3 DJ |
1401 | printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " |
1402 | "(%ld %x).\n", | |
1403 | inode->i_ino, de->flags[-high_sierra]); | |
1da177e4 LT |
1404 | } |
1405 | #endif | |
1406 | ||
1407 | inode->i_mtime.tv_sec = | |
1408 | inode->i_atime.tv_sec = | |
1409 | inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); | |
1410 | inode->i_mtime.tv_nsec = | |
1411 | inode->i_atime.tv_nsec = | |
1412 | inode->i_ctime.tv_nsec = 0; | |
1413 | ||
c3ed85a3 DJ |
1414 | ei->i_first_extent = (isonum_733(de->extent) + |
1415 | isonum_711(de->ext_attr_length)); | |
1da177e4 LT |
1416 | |
1417 | /* Set the number of blocks for stat() - should be done before RR */ | |
c3ed85a3 | 1418 | inode->i_blocks = (inode->i_size + 511) >> 9; |
1da177e4 LT |
1419 | |
1420 | /* | |
1421 | * Now test for possible Rock Ridge extensions which will override | |
1422 | * some of these numbers in the inode structure. | |
1423 | */ | |
1424 | ||
1425 | if (!high_sierra) { | |
1426 | parse_rock_ridge_inode(de, inode); | |
1427 | /* if we want uid/gid set, override the rock ridge setting */ | |
5c4a656b JK |
1428 | if (sbi->s_uid_set) |
1429 | inode->i_uid = sbi->s_uid; | |
1430 | if (sbi->s_gid_set) | |
1431 | inode->i_gid = sbi->s_gid; | |
1da177e4 | 1432 | } |
52b680c8 JK |
1433 | /* Now set final access rights if overriding rock ridge setting */ |
1434 | if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && | |
1435 | sbi->s_dmode != ISOFS_INVALID_MODE) | |
1436 | inode->i_mode = S_IFDIR | sbi->s_dmode; | |
1437 | if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && | |
1438 | sbi->s_fmode != ISOFS_INVALID_MODE) | |
1439 | inode->i_mode = S_IFREG | sbi->s_fmode; | |
1da177e4 LT |
1440 | |
1441 | /* Install the inode operations vector */ | |
1442 | if (S_ISREG(inode->i_mode)) { | |
1443 | inode->i_fop = &generic_ro_fops; | |
c3ed85a3 | 1444 | switch (ei->i_file_format) { |
1da177e4 LT |
1445 | #ifdef CONFIG_ZISOFS |
1446 | case isofs_file_compressed: | |
1447 | inode->i_data.a_ops = &zisofs_aops; | |
1448 | break; | |
1449 | #endif | |
1450 | default: | |
1451 | inode->i_data.a_ops = &isofs_aops; | |
1452 | break; | |
1453 | } | |
1454 | } else if (S_ISDIR(inode->i_mode)) { | |
1455 | inode->i_op = &isofs_dir_inode_operations; | |
1456 | inode->i_fop = &isofs_dir_operations; | |
1457 | } else if (S_ISLNK(inode->i_mode)) { | |
1458 | inode->i_op = &page_symlink_inode_operations; | |
1459 | inode->i_data.a_ops = &isofs_symlink_aops; | |
1460 | } else | |
1461 | /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ | |
1462 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
1463 | ||
c4386c83 | 1464 | ret = 0; |
9eb7f2c6 | 1465 | out: |
f99d49ad | 1466 | kfree(tmpde); |
1da177e4 LT |
1467 | if (bh) |
1468 | brelse(bh); | |
c4386c83 | 1469 | return ret; |
1da177e4 | 1470 | |
9eb7f2c6 | 1471 | out_badread: |
1da177e4 | 1472 | printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); |
9eb7f2c6 | 1473 | fail: |
1da177e4 LT |
1474 | goto out; |
1475 | } | |
1476 | ||
1477 | struct isofs_iget5_callback_data { | |
1478 | unsigned long block; | |
1479 | unsigned long offset; | |
1480 | }; | |
1481 | ||
1482 | static int isofs_iget5_test(struct inode *ino, void *data) | |
1483 | { | |
1484 | struct iso_inode_info *i = ISOFS_I(ino); | |
1485 | struct isofs_iget5_callback_data *d = | |
1486 | (struct isofs_iget5_callback_data*)data; | |
1487 | return (i->i_iget5_block == d->block) | |
c3ed85a3 | 1488 | && (i->i_iget5_offset == d->offset); |
1da177e4 LT |
1489 | } |
1490 | ||
1491 | static int isofs_iget5_set(struct inode *ino, void *data) | |
1492 | { | |
1493 | struct iso_inode_info *i = ISOFS_I(ino); | |
1494 | struct isofs_iget5_callback_data *d = | |
1495 | (struct isofs_iget5_callback_data*)data; | |
1496 | i->i_iget5_block = d->block; | |
1497 | i->i_iget5_offset = d->offset; | |
1498 | return 0; | |
1499 | } | |
1500 | ||
1501 | /* Store, in the inode's containing structure, the block and block | |
1502 | * offset that point to the underlying meta-data for the inode. The | |
1503 | * code below is otherwise similar to the iget() code in | |
1504 | * include/linux/fs.h */ | |
1505 | struct inode *isofs_iget(struct super_block *sb, | |
1506 | unsigned long block, | |
1507 | unsigned long offset) | |
1508 | { | |
1509 | unsigned long hashval; | |
1510 | struct inode *inode; | |
1511 | struct isofs_iget5_callback_data data; | |
c4386c83 | 1512 | long ret; |
1da177e4 LT |
1513 | |
1514 | if (offset >= 1ul << sb->s_blocksize_bits) | |
c4386c83 | 1515 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
1516 | |
1517 | data.block = block; | |
1518 | data.offset = offset; | |
1519 | ||
1520 | hashval = (block << sb->s_blocksize_bits) | offset; | |
1521 | ||
9eb7f2c6 | 1522 | inode = iget5_locked(sb, hashval, &isofs_iget5_test, |
c3ed85a3 | 1523 | &isofs_iget5_set, &data); |
1da177e4 | 1524 | |
c4386c83 DH |
1525 | if (!inode) |
1526 | return ERR_PTR(-ENOMEM); | |
1527 | ||
1528 | if (inode->i_state & I_NEW) { | |
1529 | ret = isofs_read_inode(inode); | |
1530 | if (ret < 0) { | |
1531 | iget_failed(inode); | |
1532 | inode = ERR_PTR(ret); | |
1533 | } else { | |
1534 | unlock_new_inode(inode); | |
1535 | } | |
1da177e4 LT |
1536 | } |
1537 | ||
1538 | return inode; | |
1539 | } | |
1540 | ||
152a0836 AV |
1541 | static struct dentry *isofs_mount(struct file_system_type *fs_type, |
1542 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1543 | { |
152a0836 | 1544 | return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); |
1da177e4 LT |
1545 | } |
1546 | ||
1547 | static struct file_system_type iso9660_fs_type = { | |
1548 | .owner = THIS_MODULE, | |
1549 | .name = "iso9660", | |
152a0836 | 1550 | .mount = isofs_mount, |
1da177e4 LT |
1551 | .kill_sb = kill_block_super, |
1552 | .fs_flags = FS_REQUIRES_DEV, | |
1553 | }; | |
1554 | ||
1555 | static int __init init_iso9660_fs(void) | |
1556 | { | |
1557 | int err = init_inodecache(); | |
1558 | if (err) | |
1559 | goto out; | |
1560 | #ifdef CONFIG_ZISOFS | |
1561 | err = zisofs_init(); | |
1562 | if (err) | |
1563 | goto out1; | |
1564 | #endif | |
1565 | err = register_filesystem(&iso9660_fs_type); | |
1566 | if (err) | |
1567 | goto out2; | |
1568 | return 0; | |
1569 | out2: | |
1570 | #ifdef CONFIG_ZISOFS | |
1571 | zisofs_cleanup(); | |
1572 | out1: | |
1573 | #endif | |
1574 | destroy_inodecache(); | |
1575 | out: | |
1576 | return err; | |
1577 | } | |
1578 | ||
1579 | static void __exit exit_iso9660_fs(void) | |
1580 | { | |
1581 | unregister_filesystem(&iso9660_fs_type); | |
1582 | #ifdef CONFIG_ZISOFS | |
1583 | zisofs_cleanup(); | |
1584 | #endif | |
1585 | destroy_inodecache(); | |
1586 | } | |
1587 | ||
1588 | module_init(init_iso9660_fs) | |
1589 | module_exit(exit_iso9660_fs) | |
1590 | MODULE_LICENSE("GPL"); | |
1591 | /* Actual filesystem name is iso9660, as requested in filesystems.c */ | |
1592 | MODULE_ALIAS("iso9660"); |