Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/isofs/inode.c | |
4 | * | |
5 | * (C) 1991 Linus Torvalds - minix filesystem | |
6 | * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem. | |
96de0e25 | 7 | * 1994 Eberhard Mönkeberg - multi session handling. |
1da177e4 LT |
8 | * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs. |
9 | * 1997 Gordon Chaffee - Joliet CDs | |
10 | * 1998 Eric Lammerts - ISO 9660 Level 3 | |
11 | * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB | |
12 | * 2004 Paul Serice - NFS Export Operations | |
13 | */ | |
14 | ||
94f2f715 | 15 | #include <linux/init.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | ||
1da177e4 | 18 | #include <linux/slab.h> |
5b825c3a | 19 | #include <linux/cred.h> |
1da177e4 LT |
20 | #include <linux/nls.h> |
21 | #include <linux/ctype.h> | |
94f2f715 AV |
22 | #include <linux/statfs.h> |
23 | #include <linux/cdrom.h> | |
3069083c | 24 | #include <linux/mpage.h> |
ba64e2b9 | 25 | #include <linux/user_namespace.h> |
86a1da6d | 26 | #include <linux/seq_file.h> |
09a4e0be | 27 | #include <linux/blkdev.h> |
1b17a46c ES |
28 | #include <linux/fs_context.h> |
29 | #include <linux/fs_parser.h> | |
1da177e4 | 30 | |
94f2f715 | 31 | #include "isofs.h" |
1da177e4 LT |
32 | #include "zisofs.h" |
33 | ||
5ad32b3a DD |
34 | /* max tz offset is 13 hours */ |
35 | #define MAX_TZ_OFFSET (52*15*60) | |
36 | ||
1da177e4 LT |
37 | #define BEQUIET |
38 | ||
da53be12 | 39 | static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); |
6fa67e70 | 40 | static int isofs_dentry_cmpi(const struct dentry *dentry, |
621e155a | 41 | unsigned int len, const char *str, const struct qstr *name); |
1da177e4 LT |
42 | |
43 | #ifdef CONFIG_JOLIET | |
da53be12 LT |
44 | static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); |
45 | static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); | |
6fa67e70 | 46 | static int isofs_dentry_cmpi_ms(const struct dentry *dentry, |
621e155a | 47 | unsigned int len, const char *str, const struct qstr *name); |
6fa67e70 | 48 | static int isofs_dentry_cmp_ms(const struct dentry *dentry, |
621e155a | 49 | unsigned int len, const char *str, const struct qstr *name); |
1da177e4 LT |
50 | #endif |
51 | ||
52 | static void isofs_put_super(struct super_block *sb) | |
53 | { | |
54 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
6cfd0148 | 55 | |
1da177e4 | 56 | #ifdef CONFIG_JOLIET |
6d729e44 | 57 | unload_nls(sbi->s_nls_iocharset); |
1da177e4 LT |
58 | #endif |
59 | ||
1da177e4 LT |
60 | kfree(sbi); |
61 | sb->s_fs_info = NULL; | |
62 | return; | |
63 | } | |
64 | ||
410dd3cf | 65 | static int isofs_read_inode(struct inode *, int relocated); |
726c3342 | 66 | static int isofs_statfs (struct dentry *, struct kstatfs *); |
86a1da6d | 67 | static int isofs_show_options(struct seq_file *, struct dentry *); |
1da177e4 | 68 | |
e18b890b | 69 | static struct kmem_cache *isofs_inode_cachep; |
1da177e4 LT |
70 | |
71 | static struct inode *isofs_alloc_inode(struct super_block *sb) | |
72 | { | |
73 | struct iso_inode_info *ei; | |
fd60b288 | 74 | ei = alloc_inode_sb(sb, isofs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
75 | if (!ei) |
76 | return NULL; | |
77 | return &ei->vfs_inode; | |
78 | } | |
79 | ||
07b01207 | 80 | static void isofs_free_inode(struct inode *inode) |
1da177e4 LT |
81 | { |
82 | kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); | |
83 | } | |
84 | ||
51cc5068 | 85 | static void init_once(void *foo) |
1da177e4 | 86 | { |
9eb7f2c6 | 87 | struct iso_inode_info *ei = foo; |
1da177e4 | 88 | |
a35afb83 | 89 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 90 | } |
c3ed85a3 | 91 | |
b3b749b7 | 92 | static int __init init_inodecache(void) |
1da177e4 LT |
93 | { |
94 | isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", | |
c3ed85a3 DJ |
95 | sizeof(struct iso_inode_info), |
96 | 0, (SLAB_RECLAIM_ACCOUNT| | |
bbff9dc7 | 97 | SLAB_ACCOUNT), |
20c2df83 | 98 | init_once); |
e96e8a1d | 99 | if (!isofs_inode_cachep) |
1da177e4 LT |
100 | return -ENOMEM; |
101 | return 0; | |
102 | } | |
103 | ||
104 | static void destroy_inodecache(void) | |
105 | { | |
8c0a8537 KS |
106 | /* |
107 | * Make sure all delayed rcu free inodes are flushed before we | |
108 | * destroy cache. | |
109 | */ | |
110 | rcu_barrier(); | |
1a1d92c1 | 111 | kmem_cache_destroy(isofs_inode_cachep); |
1da177e4 LT |
112 | } |
113 | ||
1b17a46c | 114 | static int isofs_reconfigure(struct fs_context *fc) |
1da177e4 | 115 | { |
1b17a46c ES |
116 | sync_filesystem(fc->root->d_sb); |
117 | if (!(fc->sb_flags & SB_RDONLY)) | |
17b7f7cf | 118 | return -EROFS; |
1da177e4 LT |
119 | return 0; |
120 | } | |
121 | ||
ee9b6d61 | 122 | static const struct super_operations isofs_sops = { |
1da177e4 | 123 | .alloc_inode = isofs_alloc_inode, |
07b01207 | 124 | .free_inode = isofs_free_inode, |
1da177e4 LT |
125 | .put_super = isofs_put_super, |
126 | .statfs = isofs_statfs, | |
86a1da6d | 127 | .show_options = isofs_show_options, |
1da177e4 LT |
128 | }; |
129 | ||
130 | ||
e16404ed | 131 | static const struct dentry_operations isofs_dentry_ops[] = { |
1da177e4 LT |
132 | { |
133 | .d_hash = isofs_hashi, | |
134 | .d_compare = isofs_dentry_cmpi, | |
135 | }, | |
136 | #ifdef CONFIG_JOLIET | |
137 | { | |
138 | .d_hash = isofs_hash_ms, | |
139 | .d_compare = isofs_dentry_cmp_ms, | |
140 | }, | |
141 | { | |
142 | .d_hash = isofs_hashi_ms, | |
143 | .d_compare = isofs_dentry_cmpi_ms, | |
9eb7f2c6 | 144 | }, |
1da177e4 LT |
145 | #endif |
146 | }; | |
147 | ||
1b17a46c | 148 | struct isofs_options{ |
5404ac8e | 149 | unsigned int rock:1; |
8711c67b | 150 | unsigned int joliet:1; |
5404ac8e JK |
151 | unsigned int cruft:1; |
152 | unsigned int hide:1; | |
153 | unsigned int showassoc:1; | |
154 | unsigned int nocompress:1; | |
155 | unsigned int overriderockperm:1; | |
156 | unsigned int uid_set:1; | |
157 | unsigned int gid_set:1; | |
5404ac8e | 158 | unsigned char map; |
1da177e4 LT |
159 | unsigned char check; |
160 | unsigned int blocksize; | |
7328bdd6 AV |
161 | umode_t fmode; |
162 | umode_t dmode; | |
ba64e2b9 EB |
163 | kgid_t gid; |
164 | kuid_t uid; | |
1da177e4 | 165 | char *iocharset; |
c3ed85a3 DJ |
166 | /* LVE */ |
167 | s32 session; | |
168 | s32 sbsector; | |
1da177e4 LT |
169 | }; |
170 | ||
1da177e4 LT |
171 | /* |
172 | * Compute the hash for the isofs name corresponding to the dentry. | |
173 | */ | |
174 | static int | |
8387ff25 | 175 | isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) |
1da177e4 LT |
176 | { |
177 | const char *name; | |
178 | int len; | |
179 | char c; | |
180 | unsigned long hash; | |
181 | ||
182 | len = qstr->len; | |
183 | name = qstr->name; | |
184 | if (ms) { | |
185 | while (len && name[len-1] == '.') | |
186 | len--; | |
187 | } | |
188 | ||
8387ff25 | 189 | hash = init_name_hash(dentry); |
1da177e4 LT |
190 | while (len--) { |
191 | c = tolower(*name++); | |
f17e121f | 192 | hash = partial_name_hash(c, hash); |
1da177e4 LT |
193 | } |
194 | qstr->hash = end_name_hash(hash); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | /* | |
621e155a | 200 | * Compare of two isofs names. |
1da177e4 | 201 | */ |
621e155a NP |
202 | static int isofs_dentry_cmp_common( |
203 | unsigned int len, const char *str, | |
204 | const struct qstr *name, int ms, int ci) | |
1da177e4 LT |
205 | { |
206 | int alen, blen; | |
207 | ||
208 | /* A filename cannot end in '.' or we treat it like it has none */ | |
621e155a NP |
209 | alen = name->len; |
210 | blen = len; | |
1da177e4 | 211 | if (ms) { |
621e155a | 212 | while (alen && name->name[alen-1] == '.') |
1da177e4 | 213 | alen--; |
621e155a | 214 | while (blen && str[blen-1] == '.') |
1da177e4 LT |
215 | blen--; |
216 | } | |
217 | if (alen == blen) { | |
621e155a | 218 | if (ci) { |
a97df427 | 219 | if (strncasecmp(name->name, str, alen) == 0) |
621e155a NP |
220 | return 0; |
221 | } else { | |
222 | if (strncmp(name->name, str, alen) == 0) | |
223 | return 0; | |
224 | } | |
1da177e4 LT |
225 | } |
226 | return 1; | |
227 | } | |
228 | ||
1da177e4 | 229 | static int |
da53be12 | 230 | isofs_hashi(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 | 231 | { |
8387ff25 | 232 | return isofs_hashi_common(dentry, qstr, 0); |
1da177e4 LT |
233 | } |
234 | ||
1da177e4 | 235 | static int |
6fa67e70 | 236 | isofs_dentry_cmpi(const struct dentry *dentry, |
621e155a | 237 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 238 | { |
621e155a | 239 | return isofs_dentry_cmp_common(len, str, name, 0, 1); |
1da177e4 LT |
240 | } |
241 | ||
242 | #ifdef CONFIG_JOLIET | |
7ca2f234 AB |
243 | /* |
244 | * Compute the hash for the isofs name corresponding to the dentry. | |
245 | */ | |
246 | static int | |
8387ff25 | 247 | isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) |
7ca2f234 AB |
248 | { |
249 | const char *name; | |
250 | int len; | |
251 | ||
252 | len = qstr->len; | |
253 | name = qstr->name; | |
254 | if (ms) { | |
255 | while (len && name[len-1] == '.') | |
256 | len--; | |
257 | } | |
258 | ||
8387ff25 | 259 | qstr->hash = full_name_hash(dentry, name, len); |
7ca2f234 AB |
260 | |
261 | return 0; | |
262 | } | |
263 | ||
1da177e4 | 264 | static int |
da53be12 | 265 | isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 | 266 | { |
8387ff25 | 267 | return isofs_hash_common(dentry, qstr, 1); |
1da177e4 LT |
268 | } |
269 | ||
270 | static int | |
da53be12 | 271 | isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 | 272 | { |
8387ff25 | 273 | return isofs_hashi_common(dentry, qstr, 1); |
1da177e4 LT |
274 | } |
275 | ||
276 | static int | |
6fa67e70 | 277 | isofs_dentry_cmp_ms(const struct dentry *dentry, |
621e155a | 278 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 279 | { |
621e155a | 280 | return isofs_dentry_cmp_common(len, str, name, 1, 0); |
1da177e4 LT |
281 | } |
282 | ||
283 | static int | |
6fa67e70 | 284 | isofs_dentry_cmpi_ms(const struct dentry *dentry, |
621e155a | 285 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 286 | { |
621e155a | 287 | return isofs_dentry_cmp_common(len, str, name, 1, 1); |
1da177e4 LT |
288 | } |
289 | #endif | |
290 | ||
291 | enum { | |
1b17a46c ES |
292 | Opt_block, Opt_check, Opt_cruft, Opt_gid, Opt_ignore, Opt_iocharset, |
293 | Opt_map, Opt_mode, Opt_nojoliet, Opt_norock, Opt_sb, Opt_session, | |
294 | Opt_uid, Opt_unhide, Opt_utf8, Opt_err, Opt_nocompress, Opt_hide, | |
295 | Opt_showassoc, Opt_dmode, Opt_overriderockperm, | |
1da177e4 LT |
296 | }; |
297 | ||
1b17a46c ES |
298 | static const struct constant_table isofs_param_map[] = { |
299 | {"acorn", 'a'}, | |
300 | {"a", 'a'}, | |
301 | {"normal", 'n'}, | |
302 | {"n", 'n'}, | |
303 | {"off", 'o'}, | |
304 | {"o", 'o'}, | |
305 | {} | |
1da177e4 LT |
306 | }; |
307 | ||
1b17a46c ES |
308 | static const struct constant_table isofs_param_check[] = { |
309 | {"relaxed", 'r'}, | |
310 | {"r", 'r'}, | |
311 | {"strict", 's'}, | |
312 | {"s", 's'}, | |
313 | {} | |
314 | }; | |
1da177e4 | 315 | |
1b17a46c ES |
316 | static const struct fs_parameter_spec isofs_param_spec[] = { |
317 | fsparam_flag ("norock", Opt_norock), | |
318 | fsparam_flag ("nojoliet", Opt_nojoliet), | |
319 | fsparam_flag ("unhide", Opt_unhide), | |
320 | fsparam_flag ("hide", Opt_hide), | |
321 | fsparam_flag ("showassoc", Opt_showassoc), | |
322 | fsparam_flag ("cruft", Opt_cruft), | |
323 | fsparam_flag ("utf8", Opt_utf8), | |
324 | fsparam_string ("iocharset", Opt_iocharset), | |
325 | fsparam_enum ("map", Opt_map, isofs_param_map), | |
326 | fsparam_u32 ("session", Opt_session), | |
327 | fsparam_u32 ("sbsector", Opt_sb), | |
328 | fsparam_enum ("check", Opt_check, isofs_param_check), | |
329 | fsparam_u32 ("uid", Opt_uid), | |
330 | fsparam_u32 ("gid", Opt_gid), | |
331 | /* Note: mode/dmode historically accepted %u not strictly %o */ | |
332 | fsparam_u32 ("mode", Opt_mode), | |
333 | fsparam_u32 ("dmode", Opt_dmode), | |
334 | fsparam_flag ("overriderockperm", Opt_overriderockperm), | |
335 | fsparam_u32 ("block", Opt_block), | |
336 | fsparam_string ("conv", Opt_ignore), | |
337 | fsparam_flag ("nocompress", Opt_nocompress), | |
338 | {} | |
339 | }; | |
340 | ||
341 | static int isofs_parse_param(struct fs_context *fc, | |
342 | struct fs_parameter *param) | |
343 | { | |
344 | struct isofs_options *popt = fc->fs_private; | |
345 | struct fs_parse_result result; | |
346 | int opt; | |
347 | kuid_t uid; | |
348 | kgid_t gid; | |
349 | unsigned int n; | |
350 | ||
351 | /* There are no remountable options */ | |
352 | if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) | |
353 | return 0; | |
354 | ||
355 | opt = fs_parse(fc, isofs_param_spec, param, &result); | |
356 | if (opt < 0) | |
357 | return opt; | |
358 | ||
359 | switch (opt) { | |
360 | case Opt_norock: | |
361 | popt->rock = 0; | |
362 | break; | |
363 | case Opt_nojoliet: | |
364 | popt->joliet = 0; | |
365 | break; | |
366 | case Opt_hide: | |
367 | popt->hide = 1; | |
368 | break; | |
369 | case Opt_unhide: | |
370 | case Opt_showassoc: | |
371 | popt->showassoc = 1; | |
372 | break; | |
373 | case Opt_cruft: | |
374 | popt->cruft = 1; | |
375 | break; | |
28ce50f8 | 376 | #ifdef CONFIG_JOLIET |
1b17a46c ES |
377 | case Opt_utf8: |
378 | kfree(popt->iocharset); | |
379 | popt->iocharset = kstrdup("utf8", GFP_KERNEL); | |
380 | if (!popt->iocharset) | |
381 | return -ENOMEM; | |
382 | break; | |
383 | case Opt_iocharset: | |
384 | kfree(popt->iocharset); | |
385 | popt->iocharset = kstrdup(param->string, GFP_KERNEL); | |
386 | if (!popt->iocharset) | |
387 | return -ENOMEM; | |
388 | break; | |
1da177e4 | 389 | #endif |
1b17a46c ES |
390 | case Opt_map: |
391 | popt->map = result.uint_32; | |
392 | break; | |
393 | case Opt_session: | |
394 | n = result.uint_32; | |
395 | /* | |
396 | * Track numbers are supposed to be in range 1-99, the | |
397 | * mount option starts indexing at 0. | |
398 | */ | |
399 | if (n >= 99) | |
400 | return -EINVAL; | |
401 | popt->session = n + 1; | |
402 | break; | |
403 | case Opt_sb: | |
404 | popt->sbsector = result.uint_32; | |
405 | break; | |
406 | case Opt_check: | |
407 | popt->check = result.uint_32; | |
408 | break; | |
409 | case Opt_ignore: | |
410 | break; | |
411 | case Opt_uid: | |
412 | uid = make_kuid(current_user_ns(), result.uint_32); | |
413 | if (!uid_valid(uid)) | |
414 | return -EINVAL; | |
415 | popt->uid = uid; | |
416 | popt->uid_set = 1; | |
417 | break; | |
418 | case Opt_gid: | |
419 | gid = make_kgid(current_user_ns(), result.uint_32); | |
420 | if (!gid_valid(gid)) | |
421 | return -EINVAL; | |
422 | popt->gid = gid; | |
423 | popt->gid_set = 1; | |
424 | break; | |
425 | case Opt_mode: | |
426 | popt->fmode = result.uint_32; | |
427 | break; | |
428 | case Opt_dmode: | |
429 | popt->dmode = result.uint_32; | |
430 | break; | |
431 | case Opt_overriderockperm: | |
432 | popt->overriderockperm = 1; | |
433 | break; | |
434 | case Opt_block: | |
435 | n = result.uint_32; | |
436 | if (n != 512 && n != 1024 && n != 2048) | |
437 | return -EINVAL; | |
438 | popt->blocksize = n; | |
439 | break; | |
440 | case Opt_nocompress: | |
441 | popt->nocompress = 1; | |
442 | break; | |
443 | default: | |
444 | return -EINVAL; | |
1da177e4 | 445 | } |
1b17a46c | 446 | return 0; |
1da177e4 LT |
447 | } |
448 | ||
86a1da6d DH |
449 | /* |
450 | * Display the mount options in /proc/mounts. | |
451 | */ | |
452 | static int isofs_show_options(struct seq_file *m, struct dentry *root) | |
453 | { | |
454 | struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); | |
455 | ||
456 | if (!sbi->s_rock) seq_puts(m, ",norock"); | |
457 | else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); | |
458 | if (sbi->s_cruft) seq_puts(m, ",cruft"); | |
459 | if (sbi->s_hide) seq_puts(m, ",hide"); | |
460 | if (sbi->s_nocompress) seq_puts(m, ",nocompress"); | |
461 | if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); | |
462 | if (sbi->s_showassoc) seq_puts(m, ",showassoc"); | |
86a1da6d DH |
463 | |
464 | if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); | |
465 | if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); | |
fdb254db | 466 | if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); |
86a1da6d DH |
467 | if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); |
468 | ||
469 | if (root->d_sb->s_blocksize != 1024) | |
470 | seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); | |
471 | ||
472 | if (sbi->s_uid_set) | |
473 | seq_printf(m, ",uid=%u", | |
474 | from_kuid_munged(&init_user_ns, sbi->s_uid)); | |
475 | if (sbi->s_gid_set) | |
476 | seq_printf(m, ",gid=%u", | |
477 | from_kgid_munged(&init_user_ns, sbi->s_gid)); | |
478 | ||
479 | if (sbi->s_dmode != ISOFS_INVALID_MODE) | |
480 | seq_printf(m, ",dmode=%o", sbi->s_dmode); | |
481 | if (sbi->s_fmode != ISOFS_INVALID_MODE) | |
482 | seq_printf(m, ",fmode=%o", sbi->s_fmode); | |
483 | ||
0ab0b271 | 484 | #ifdef CONFIG_JOLIET |
28ce50f8 | 485 | if (sbi->s_nls_iocharset) |
86a1da6d | 486 | seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); |
28ce50f8 PR |
487 | else |
488 | seq_puts(m, ",iocharset=utf8"); | |
0ab0b271 | 489 | #endif |
86a1da6d DH |
490 | return 0; |
491 | } | |
492 | ||
1da177e4 LT |
493 | /* |
494 | * look if the driver can tell the multi session redirection value | |
495 | * | |
496 | * don't change this if you don't know what you do, please! | |
497 | * Multisession is legal only with XA disks. | |
498 | * A non-XA disk with more than one volume descriptor may do it right, but | |
499 | * usually is written in a nowhere standardized "multi-partition" manner. | |
500 | * Multisession uses absolute addressing (solely the first frame of the whole | |
501 | * track is #0), multi-partition uses relative addressing (each first frame of | |
502 | * each track is #0), and a track is not a session. | |
503 | * | |
504 | * A broken CDwriter software or drive firmware does not set new standards, | |
505 | * at least not if conflicting with the existing ones. | |
506 | * | |
507 | * emoenke@gwdg.de | |
508 | */ | |
509 | #define WE_OBEY_THE_WRITTEN_STANDARDS 1 | |
510 | ||
9eb7f2c6 | 511 | static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) |
1da177e4 | 512 | { |
11aa40a0 CH |
513 | struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); |
514 | unsigned int vol_desc_start = 0; | |
1da177e4 | 515 | |
34363c05 | 516 | if (session > 0) { |
11aa40a0 CH |
517 | struct cdrom_tocentry te; |
518 | ||
519 | if (!cdi) | |
520 | return 0; | |
521 | ||
522 | te.cdte_track = session; | |
523 | te.cdte_format = CDROM_LBA; | |
524 | if (cdrom_read_tocentry(cdi, &te) == 0) { | |
c3ed85a3 | 525 | printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", |
11aa40a0 CH |
526 | session, te.cdte_addr.lba, |
527 | te.cdte_ctrl & CDROM_DATA_TRACK); | |
528 | if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4) | |
529 | return te.cdte_addr.lba; | |
1da177e4 | 530 | } |
c3ed85a3 DJ |
531 | |
532 | printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); | |
1da177e4 | 533 | } |
11aa40a0 CH |
534 | |
535 | if (cdi) { | |
536 | struct cdrom_multisession ms_info; | |
537 | ||
538 | ms_info.addr_format = CDROM_LBA; | |
539 | if (cdrom_multisession(cdi, &ms_info) == 0) { | |
1da177e4 | 540 | #if WE_OBEY_THE_WRITTEN_STANDARDS |
11aa40a0 CH |
541 | /* necessary for a valid ms_info.addr */ |
542 | if (ms_info.xa_flag) | |
1da177e4 | 543 | #endif |
11aa40a0 CH |
544 | vol_desc_start = ms_info.addr.lba; |
545 | } | |
546 | } | |
547 | ||
1da177e4 LT |
548 | return vol_desc_start; |
549 | } | |
550 | ||
e45c9eff OZ |
551 | /* |
552 | * Check if root directory is empty (has less than 3 files). | |
553 | * | |
554 | * Used to detect broken CDs where ISO root directory is empty but Joliet root | |
555 | * directory is OK. If such CD has Rock Ridge extensions, they will be disabled | |
556 | * (and Joliet used instead) or else no files would be visible. | |
557 | */ | |
558 | static bool rootdir_empty(struct super_block *sb, unsigned long block) | |
559 | { | |
560 | int offset = 0, files = 0, de_len; | |
561 | struct iso_directory_record *de; | |
562 | struct buffer_head *bh; | |
563 | ||
564 | bh = sb_bread(sb, block); | |
565 | if (!bh) | |
566 | return true; | |
567 | while (files < 3) { | |
568 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
569 | de_len = *(unsigned char *) de; | |
570 | if (de_len == 0) | |
571 | break; | |
572 | files++; | |
573 | offset += de_len; | |
574 | } | |
575 | brelse(bh); | |
576 | return files < 3; | |
577 | } | |
578 | ||
1da177e4 LT |
579 | /* |
580 | * Initialize the superblock and read the root inode. | |
1da177e4 | 581 | */ |
1b17a46c | 582 | static int isofs_fill_super(struct super_block *s, struct fs_context *fc) |
1da177e4 | 583 | { |
c3ed85a3 DJ |
584 | struct buffer_head *bh = NULL, *pri_bh = NULL; |
585 | struct hs_primary_descriptor *h_pri = NULL; | |
586 | struct iso_primary_descriptor *pri = NULL; | |
1da177e4 | 587 | struct iso_supplementary_descriptor *sec = NULL; |
c3ed85a3 DJ |
588 | struct iso_directory_record *rootp; |
589 | struct inode *inode; | |
1b17a46c | 590 | struct isofs_options *opt = fc->fs_private; |
c3ed85a3 DJ |
591 | struct isofs_sb_info *sbi; |
592 | unsigned long first_data_zone; | |
593 | int joliet_level = 0; | |
594 | int iso_blknum, block; | |
595 | int orig_zonesize; | |
c4386c83 | 596 | int table, error = -EINVAL; |
c3ed85a3 | 597 | unsigned int vol_desc_start; |
1b17a46c | 598 | int silent = fc->sb_flags & SB_SILENT; |
1da177e4 | 599 | |
f8314dc6 | 600 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
4f819a78 | 601 | if (!sbi) |
1da177e4 LT |
602 | return -ENOMEM; |
603 | s->s_fs_info = sbi; | |
1da177e4 | 604 | |
1da177e4 LT |
605 | /* |
606 | * First of all, get the hardware blocksize for this device. | |
607 | * If we don't know what it is, or the hardware blocksize is | |
608 | * larger than the blocksize the user specified, then use | |
609 | * that value. | |
610 | */ | |
611 | /* | |
612 | * What if bugger tells us to go beyond page size? | |
613 | */ | |
09a4e0be ES |
614 | if (bdev_logical_block_size(s->s_bdev) > 2048) { |
615 | printk(KERN_WARNING | |
616 | "ISOFS: unsupported/invalid hardware sector size %d\n", | |
617 | bdev_logical_block_size(s->s_bdev)); | |
618 | goto out_freesbi; | |
619 | } | |
1b17a46c | 620 | opt->blocksize = sb_min_blocksize(s, opt->blocksize); |
1da177e4 LT |
621 | |
622 | sbi->s_high_sierra = 0; /* default is iso9660 */ | |
1b17a46c ES |
623 | sbi->s_session = opt->session; |
624 | sbi->s_sbsector = opt->sbsector; | |
1da177e4 | 625 | |
1b17a46c ES |
626 | vol_desc_start = (opt->sbsector != -1) ? |
627 | opt->sbsector : isofs_get_last_session(s, opt->session); | |
1da177e4 | 628 | |
c3ed85a3 DJ |
629 | for (iso_blknum = vol_desc_start+16; |
630 | iso_blknum < vol_desc_start+100; iso_blknum++) { | |
631 | struct hs_volume_descriptor *hdp; | |
632 | struct iso_volume_descriptor *vdp; | |
633 | ||
634 | block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); | |
635 | if (!(bh = sb_bread(s, block))) | |
636 | goto out_no_read; | |
637 | ||
638 | vdp = (struct iso_volume_descriptor *)bh->b_data; | |
639 | hdp = (struct hs_volume_descriptor *)bh->b_data; | |
640 | ||
641 | /* | |
642 | * Due to the overlapping physical location of the descriptors, | |
643 | * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure | |
644 | * proper identification in this case, we first check for ISO. | |
645 | */ | |
646 | if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { | |
647 | if (isonum_711(vdp->type) == ISO_VD_END) | |
648 | break; | |
649 | if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { | |
e96e8a1d | 650 | if (!pri) { |
c3ed85a3 DJ |
651 | pri = (struct iso_primary_descriptor *)vdp; |
652 | /* Save the buffer in case we need it ... */ | |
653 | pri_bh = bh; | |
654 | bh = NULL; | |
655 | } | |
656 | } | |
1da177e4 | 657 | #ifdef CONFIG_JOLIET |
c3ed85a3 DJ |
658 | else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { |
659 | sec = (struct iso_supplementary_descriptor *)vdp; | |
660 | if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { | |
1b17a46c | 661 | if (opt->joliet) { |
c3ed85a3 DJ |
662 | if (sec->escape[2] == 0x40) |
663 | joliet_level = 1; | |
664 | else if (sec->escape[2] == 0x43) | |
665 | joliet_level = 2; | |
666 | else if (sec->escape[2] == 0x45) | |
667 | joliet_level = 3; | |
668 | ||
669 | printk(KERN_DEBUG "ISO 9660 Extensions: " | |
670 | "Microsoft Joliet Level %d\n", | |
671 | joliet_level); | |
672 | } | |
673 | goto root_found; | |
674 | } else { | |
675 | /* Unknown supplementary volume descriptor */ | |
676 | sec = NULL; | |
677 | } | |
1da177e4 | 678 | } |
1da177e4 | 679 | #endif |
c3ed85a3 DJ |
680 | } else { |
681 | if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { | |
682 | if (isonum_711(hdp->type) != ISO_VD_PRIMARY) | |
683 | goto out_freebh; | |
684 | ||
685 | sbi->s_high_sierra = 1; | |
1b17a46c | 686 | opt->rock = 0; |
c3ed85a3 DJ |
687 | h_pri = (struct hs_primary_descriptor *)vdp; |
688 | goto root_found; | |
689 | } | |
1da177e4 | 690 | } |
1da177e4 | 691 | |
c3ed85a3 | 692 | /* Just skip any volume descriptors we don't recognize */ |
1da177e4 | 693 | |
c3ed85a3 DJ |
694 | brelse(bh); |
695 | bh = NULL; | |
1da177e4 LT |
696 | } |
697 | /* | |
698 | * If we fall through, either no volume descriptor was found, | |
699 | * or else we passed a primary descriptor looking for others. | |
700 | */ | |
701 | if (!pri) | |
702 | goto out_unknown_format; | |
703 | brelse(bh); | |
704 | bh = pri_bh; | |
705 | pri_bh = NULL; | |
706 | ||
707 | root_found: | |
a2ed0b39 | 708 | /* We don't support read-write mounts */ |
bc98a42c | 709 | if (!sb_rdonly(s)) { |
a2ed0b39 JK |
710 | error = -EACCES; |
711 | goto out_freebh; | |
712 | } | |
1da177e4 | 713 | |
1b17a46c | 714 | if (joliet_level && (!pri || !opt->rock)) { |
c3ed85a3 DJ |
715 | /* This is the case of Joliet with the norock mount flag. |
716 | * A disc with both Joliet and Rock Ridge is handled later | |
717 | */ | |
718 | pri = (struct iso_primary_descriptor *) sec; | |
1da177e4 LT |
719 | } |
720 | ||
721 | if(sbi->s_high_sierra){ | |
c3ed85a3 DJ |
722 | rootp = (struct iso_directory_record *) h_pri->root_directory_record; |
723 | sbi->s_nzones = isonum_733(h_pri->volume_space_size); | |
724 | sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); | |
725 | sbi->s_max_size = isonum_733(h_pri->volume_space_size); | |
1da177e4 | 726 | } else { |
c3ed85a3 DJ |
727 | if (!pri) |
728 | goto out_freebh; | |
729 | rootp = (struct iso_directory_record *) pri->root_directory_record; | |
730 | sbi->s_nzones = isonum_733(pri->volume_space_size); | |
731 | sbi->s_log_zone_size = isonum_723(pri->logical_block_size); | |
732 | sbi->s_max_size = isonum_733(pri->volume_space_size); | |
1da177e4 LT |
733 | } |
734 | ||
735 | sbi->s_ninodes = 0; /* No way to figure this out easily */ | |
736 | ||
737 | orig_zonesize = sbi->s_log_zone_size; | |
738 | /* | |
739 | * If the zone size is smaller than the hardware sector size, | |
740 | * this is a fatal error. This would occur if the disc drive | |
741 | * had sectors that were 2048 bytes, but the filesystem had | |
742 | * blocks that were 512 bytes (which should only very rarely | |
743 | * happen.) | |
744 | */ | |
1b17a46c | 745 | if (orig_zonesize < opt->blocksize) |
1da177e4 LT |
746 | goto out_bad_size; |
747 | ||
748 | /* RDE: convert log zone size to bit shift */ | |
c3ed85a3 DJ |
749 | switch (sbi->s_log_zone_size) { |
750 | case 512: sbi->s_log_zone_size = 9; break; | |
751 | case 1024: sbi->s_log_zone_size = 10; break; | |
752 | case 2048: sbi->s_log_zone_size = 11; break; | |
1da177e4 | 753 | |
c3ed85a3 | 754 | default: |
1da177e4 | 755 | goto out_bad_zone_size; |
c3ed85a3 | 756 | } |
1da177e4 LT |
757 | |
758 | s->s_magic = ISOFS_SUPER_MAGIC; | |
66a362a2 JA |
759 | |
760 | /* | |
761 | * With multi-extent files, file size is only limited by the maximum | |
762 | * size of a file system, which is 8 TB. | |
763 | */ | |
764 | s->s_maxbytes = 0x80000000000LL; | |
1da177e4 | 765 | |
5ad32b3a DD |
766 | /* ECMA-119 timestamp from 1900/1/1 with tz offset */ |
767 | s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET; | |
768 | s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET; | |
769 | ||
1da177e4 LT |
770 | /* Set this for reference. Its not currently used except on write |
771 | which we don't have .. */ | |
c3ed85a3 DJ |
772 | |
773 | first_data_zone = isonum_733(rootp->extent) + | |
774 | isonum_711(rootp->ext_attr_length); | |
1da177e4 LT |
775 | sbi->s_firstdatazone = first_data_zone; |
776 | #ifndef BEQUIET | |
c3ed85a3 DJ |
777 | printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", |
778 | sbi->s_max_size, 1UL << sbi->s_log_zone_size); | |
779 | printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); | |
1da177e4 | 780 | if(sbi->s_high_sierra) |
c3ed85a3 | 781 | printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); |
1da177e4 LT |
782 | #endif |
783 | ||
784 | /* | |
785 | * If the Joliet level is set, we _may_ decide to use the | |
786 | * secondary descriptor, but can't be sure until after we | |
787 | * read the root inode. But before reading the root inode | |
788 | * we may need to change the device blocksize, and would | |
789 | * rather release the old buffer first. So, we cache the | |
790 | * first_data_zone value from the secondary descriptor. | |
791 | */ | |
792 | if (joliet_level) { | |
793 | pri = (struct iso_primary_descriptor *) sec; | |
794 | rootp = (struct iso_directory_record *) | |
795 | pri->root_directory_record; | |
c3ed85a3 DJ |
796 | first_data_zone = isonum_733(rootp->extent) + |
797 | isonum_711(rootp->ext_attr_length); | |
1da177e4 LT |
798 | } |
799 | ||
800 | /* | |
801 | * We're all done using the volume descriptor, and may need | |
802 | * to change the device blocksize, so release the buffer now. | |
803 | */ | |
804 | brelse(pri_bh); | |
805 | brelse(bh); | |
806 | ||
807 | /* | |
808 | * Force the blocksize to 512 for 512 byte sectors. The file | |
809 | * read primitives really get it wrong in a bad way if we don't | |
810 | * do this. | |
811 | * | |
812 | * Note - we should never be setting the blocksize to something | |
813 | * less than the hardware sector size for the device. If we | |
814 | * do, we would end up having to read larger buffers and split | |
815 | * out portions to satisfy requests. | |
816 | * | |
817 | * Note2- the idea here is that we want to deal with the optimal | |
818 | * zonesize in the filesystem. If we have it set to something less, | |
819 | * then we have horrible problems with trying to piece together | |
820 | * bits of adjacent blocks in order to properly read directory | |
821 | * entries. By forcing the blocksize in this way, we ensure | |
822 | * that we will never be required to do this. | |
823 | */ | |
824 | sb_set_blocksize(s, orig_zonesize); | |
825 | ||
826 | sbi->s_nls_iocharset = NULL; | |
827 | ||
828 | #ifdef CONFIG_JOLIET | |
28ce50f8 | 829 | if (joliet_level) { |
1b17a46c | 830 | char *p = opt->iocharset ? opt->iocharset : CONFIG_NLS_DEFAULT; |
28ce50f8 | 831 | if (strcmp(p, "utf8") != 0) { |
1b17a46c ES |
832 | sbi->s_nls_iocharset = opt->iocharset ? |
833 | load_nls(opt->iocharset) : load_nls_default(); | |
28ce50f8 | 834 | if (!sbi->s_nls_iocharset) |
1da177e4 | 835 | goto out_freesbi; |
1da177e4 LT |
836 | } |
837 | } | |
838 | #endif | |
839 | s->s_op = &isofs_sops; | |
840 | s->s_export_op = &isofs_export_ops; | |
1b17a46c ES |
841 | sbi->s_mapping = opt->map; |
842 | sbi->s_rock = (opt->rock ? 2 : 0); | |
1da177e4 | 843 | sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ |
1b17a46c ES |
844 | sbi->s_cruft = opt->cruft; |
845 | sbi->s_hide = opt->hide; | |
846 | sbi->s_showassoc = opt->showassoc; | |
847 | sbi->s_uid = opt->uid; | |
848 | sbi->s_gid = opt->gid; | |
849 | sbi->s_uid_set = opt->uid_set; | |
850 | sbi->s_gid_set = opt->gid_set; | |
851 | sbi->s_nocompress = opt->nocompress; | |
852 | sbi->s_overriderockperm = opt->overriderockperm; | |
1da177e4 LT |
853 | /* |
854 | * It would be incredibly stupid to allow people to mark every file | |
855 | * on the disk as suid, so we merely allow them to set the default | |
856 | * permissions. | |
857 | */ | |
1b17a46c ES |
858 | if (opt->fmode != ISOFS_INVALID_MODE) |
859 | sbi->s_fmode = opt->fmode & 0777; | |
52b680c8 JK |
860 | else |
861 | sbi->s_fmode = ISOFS_INVALID_MODE; | |
1b17a46c ES |
862 | if (opt->dmode != ISOFS_INVALID_MODE) |
863 | sbi->s_dmode = opt->dmode & 0777; | |
52b680c8 JK |
864 | else |
865 | sbi->s_dmode = ISOFS_INVALID_MODE; | |
1da177e4 LT |
866 | |
867 | /* | |
868 | * Read the root inode, which _may_ result in changing | |
869 | * the s_rock flag. Once we have the final s_rock value, | |
870 | * we then decide whether to use the Joliet descriptor. | |
871 | */ | |
872 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
4243bf80 AH |
873 | |
874 | /* | |
875 | * Fix for broken CDs with a corrupt root inode but a correct Joliet | |
876 | * root directory. | |
877 | */ | |
878 | if (IS_ERR(inode)) { | |
879 | if (joliet_level && sbi->s_firstdatazone != first_data_zone) { | |
880 | printk(KERN_NOTICE | |
881 | "ISOFS: root inode is unusable. " | |
882 | "Disabling Rock Ridge and switching to Joliet."); | |
883 | sbi->s_rock = 0; | |
884 | inode = NULL; | |
885 | } else { | |
886 | goto out_no_root; | |
887 | } | |
888 | } | |
1da177e4 | 889 | |
e45c9eff OZ |
890 | /* |
891 | * Fix for broken CDs with Rock Ridge and empty ISO root directory but | |
892 | * correct Joliet root directory. | |
893 | */ | |
894 | if (sbi->s_rock == 1 && joliet_level && | |
895 | rootdir_empty(s, sbi->s_firstdatazone)) { | |
896 | printk(KERN_NOTICE | |
897 | "ISOFS: primary root directory is empty. " | |
898 | "Disabling Rock Ridge and switching to Joliet."); | |
899 | sbi->s_rock = 0; | |
900 | } | |
901 | ||
1da177e4 LT |
902 | /* |
903 | * If this disk has both Rock Ridge and Joliet on it, then we | |
904 | * want to use Rock Ridge by default. This can be overridden | |
905 | * by using the norock mount option. There is still one other | |
906 | * possibility that is not taken into account: a Rock Ridge | |
907 | * CD with Unicode names. Until someone sees such a beast, it | |
908 | * will not be supported. | |
909 | */ | |
910 | if (sbi->s_rock == 1) { | |
911 | joliet_level = 0; | |
912 | } else if (joliet_level) { | |
913 | sbi->s_rock = 0; | |
914 | if (sbi->s_firstdatazone != first_data_zone) { | |
915 | sbi->s_firstdatazone = first_data_zone; | |
c3ed85a3 | 916 | printk(KERN_DEBUG |
1da177e4 LT |
917 | "ISOFS: changing to secondary root\n"); |
918 | iput(inode); | |
919 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
c4386c83 DH |
920 | if (IS_ERR(inode)) |
921 | goto out_no_root; | |
1da177e4 LT |
922 | } |
923 | } | |
924 | ||
1b17a46c | 925 | if (opt->check == 'u') { |
1da177e4 | 926 | /* Only Joliet is case insensitive by default */ |
c3ed85a3 | 927 | if (joliet_level) |
1b17a46c | 928 | opt->check = 'r'; |
c3ed85a3 | 929 | else |
1b17a46c | 930 | opt->check = 's'; |
1da177e4 LT |
931 | } |
932 | sbi->s_joliet_level = joliet_level; | |
933 | ||
817794e0 KK |
934 | /* Make sure the root inode is a directory */ |
935 | if (!S_ISDIR(inode->i_mode)) { | |
936 | printk(KERN_WARNING | |
937 | "isofs_fill_super: root inode is not a directory. " | |
938 | "Corrupted media?\n"); | |
939 | goto out_iput; | |
940 | } | |
941 | ||
1da177e4 | 942 | table = 0; |
c3ed85a3 DJ |
943 | if (joliet_level) |
944 | table += 2; | |
1b17a46c | 945 | if (opt->check == 'r') |
c3ed85a3 | 946 | table++; |
1b17a46c | 947 | sbi->s_check = opt->check; |
6cc9c1d2 | 948 | |
b0afd8e5 AV |
949 | if (table) |
950 | s->s_d_op = &isofs_dentry_ops[table - 1]; | |
6cc9c1d2 AV |
951 | |
952 | /* get the root dentry */ | |
48fde701 | 953 | s->s_root = d_make_root(inode); |
8fdd8c49 | 954 | if (!(s->s_root)) { |
8fdd8c49 AV |
955 | error = -ENOMEM; |
956 | goto out_no_inode; | |
957 | } | |
1da177e4 | 958 | |
1b17a46c | 959 | kfree(opt->iocharset); |
1da177e4 LT |
960 | |
961 | return 0; | |
962 | ||
963 | /* | |
964 | * Display error messages and free resources. | |
965 | */ | |
1da177e4 LT |
966 | out_iput: |
967 | iput(inode); | |
c4386c83 DH |
968 | goto out_no_inode; |
969 | out_no_root: | |
970 | error = PTR_ERR(inode); | |
971 | if (error != -ENOMEM) | |
972 | printk(KERN_WARNING "%s: get root inode failed\n", __func__); | |
973 | out_no_inode: | |
1da177e4 | 974 | #ifdef CONFIG_JOLIET |
6d729e44 | 975 | unload_nls(sbi->s_nls_iocharset); |
1da177e4 LT |
976 | #endif |
977 | goto out_freesbi; | |
978 | out_no_read: | |
c3ed85a3 DJ |
979 | printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", |
980 | __func__, s->s_id, iso_blknum, block); | |
c11760c6 | 981 | goto out_freebh; |
1da177e4 | 982 | out_bad_zone_size: |
c3ed85a3 | 983 | printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", |
1da177e4 LT |
984 | sbi->s_log_zone_size); |
985 | goto out_freebh; | |
986 | out_bad_size: | |
c3ed85a3 | 987 | printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", |
1b17a46c | 988 | orig_zonesize, opt->blocksize); |
1da177e4 LT |
989 | goto out_freebh; |
990 | out_unknown_format: | |
991 | if (!silent) | |
c3ed85a3 | 992 | printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); |
1da177e4 LT |
993 | |
994 | out_freebh: | |
995 | brelse(bh); | |
c11760c6 | 996 | brelse(pri_bh); |
1da177e4 | 997 | out_freesbi: |
1b17a46c | 998 | kfree(opt->iocharset); |
1da177e4 LT |
999 | kfree(sbi); |
1000 | s->s_fs_info = NULL; | |
c4386c83 | 1001 | return error; |
1da177e4 LT |
1002 | } |
1003 | ||
726c3342 | 1004 | static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 1005 | { |
726c3342 | 1006 | struct super_block *sb = dentry->d_sb; |
2430c4da | 1007 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
726c3342 | 1008 | |
1da177e4 LT |
1009 | buf->f_type = ISOFS_SUPER_MAGIC; |
1010 | buf->f_bsize = sb->s_blocksize; | |
1011 | buf->f_blocks = (ISOFS_SB(sb)->s_nzones | |
c3ed85a3 | 1012 | << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); |
1da177e4 LT |
1013 | buf->f_bfree = 0; |
1014 | buf->f_bavail = 0; | |
1015 | buf->f_files = ISOFS_SB(sb)->s_ninodes; | |
1016 | buf->f_ffree = 0; | |
6d1349c7 | 1017 | buf->f_fsid = u64_to_fsid(id); |
1da177e4 LT |
1018 | buf->f_namelen = NAME_MAX; |
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * Get a set of blocks; filling in buffer_heads if already allocated | |
1024 | * or getblk() if they are not. Returns the number of blocks inserted | |
c4386c83 | 1025 | * (-ve == error.) |
1da177e4 | 1026 | */ |
fde214d4 | 1027 | int isofs_get_blocks(struct inode *inode, sector_t iblock, |
1da177e4 LT |
1028 | struct buffer_head **bh, unsigned long nblocks) |
1029 | { | |
fde214d4 | 1030 | unsigned long b_off = iblock; |
1da177e4 LT |
1031 | unsigned offset, sect_size; |
1032 | unsigned int firstext; | |
1033 | unsigned long nextblk, nextoff; | |
c4386c83 | 1034 | int section, rv, error; |
1da177e4 LT |
1035 | struct iso_inode_info *ei = ISOFS_I(inode); |
1036 | ||
c4386c83 | 1037 | error = -EIO; |
1da177e4 | 1038 | rv = 0; |
fde214d4 | 1039 | if (iblock != b_off) { |
c3ed85a3 | 1040 | printk(KERN_DEBUG "%s: block number too large\n", __func__); |
1da177e4 LT |
1041 | goto abort; |
1042 | } | |
1043 | ||
c3ed85a3 DJ |
1044 | |
1045 | offset = 0; | |
1046 | firstext = ei->i_first_extent; | |
1da177e4 | 1047 | sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); |
c3ed85a3 DJ |
1048 | nextblk = ei->i_next_section_block; |
1049 | nextoff = ei->i_next_section_offset; | |
1050 | section = 0; | |
1da177e4 | 1051 | |
c3ed85a3 | 1052 | while (nblocks) { |
1da177e4 LT |
1053 | /* If we are *way* beyond the end of the file, print a message. |
1054 | * Access beyond the end of the file up to the next page boundary | |
1055 | * is normal, however because of the way the page cache works. | |
1056 | * In this case, we just return 0 so that we can properly fill | |
1057 | * the page with useless information without generating any | |
1058 | * I/O errors. | |
1059 | */ | |
09cbfeaf | 1060 | if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { |
fde214d4 JK |
1061 | printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", |
1062 | __func__, b_off, | |
1063 | (unsigned long long)inode->i_size); | |
1da177e4 LT |
1064 | goto abort; |
1065 | } | |
c3ed85a3 | 1066 | |
fb50ae74 JRV |
1067 | /* On the last section, nextblk == 0, section size is likely to |
1068 | * exceed sect_size by a partial block, and access beyond the | |
1069 | * end of the file will reach beyond the section size, too. | |
1070 | */ | |
1071 | while (nextblk && (b_off >= (offset + sect_size))) { | |
1072 | struct inode *ninode; | |
1073 | ||
1074 | offset += sect_size; | |
1075 | ninode = isofs_iget(inode->i_sb, nextblk, nextoff); | |
c4386c83 DH |
1076 | if (IS_ERR(ninode)) { |
1077 | error = PTR_ERR(ninode); | |
fb50ae74 | 1078 | goto abort; |
c4386c83 | 1079 | } |
fb50ae74 JRV |
1080 | firstext = ISOFS_I(ninode)->i_first_extent; |
1081 | sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); | |
1082 | nextblk = ISOFS_I(ninode)->i_next_section_block; | |
1083 | nextoff = ISOFS_I(ninode)->i_next_section_offset; | |
1084 | iput(ninode); | |
1085 | ||
1086 | if (++section > 100) { | |
c3ed85a3 DJ |
1087 | printk(KERN_DEBUG "%s: More than 100 file sections ?!?" |
1088 | " aborting...\n", __func__); | |
fde214d4 | 1089 | printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " |
c3ed85a3 | 1090 | "nextblk=%lu nextoff=%lu\n", __func__, |
fde214d4 | 1091 | b_off, firstext, (unsigned) sect_size, |
c3ed85a3 | 1092 | nextblk, nextoff); |
fb50ae74 | 1093 | goto abort; |
1da177e4 LT |
1094 | } |
1095 | } | |
c3ed85a3 DJ |
1096 | |
1097 | if (*bh) { | |
1da177e4 LT |
1098 | map_bh(*bh, inode->i_sb, firstext + b_off - offset); |
1099 | } else { | |
1100 | *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); | |
c3ed85a3 | 1101 | if (!*bh) |
1da177e4 LT |
1102 | goto abort; |
1103 | } | |
1104 | bh++; /* Next buffer head */ | |
1105 | b_off++; /* Next buffer offset */ | |
1106 | nblocks--; | |
1107 | rv++; | |
1108 | } | |
1109 | ||
c4386c83 | 1110 | error = 0; |
1da177e4 | 1111 | abort: |
c4386c83 | 1112 | return rv != 0 ? rv : error; |
1da177e4 LT |
1113 | } |
1114 | ||
1115 | /* | |
1116 | * Used by the standard interfaces. | |
1117 | */ | |
1118 | static int isofs_get_block(struct inode *inode, sector_t iblock, | |
1119 | struct buffer_head *bh_result, int create) | |
1120 | { | |
c4386c83 DH |
1121 | int ret; |
1122 | ||
9eb7f2c6 | 1123 | if (create) { |
c3ed85a3 | 1124 | printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); |
1da177e4 LT |
1125 | return -EROFS; |
1126 | } | |
1127 | ||
c4386c83 DH |
1128 | ret = isofs_get_blocks(inode, iblock, &bh_result, 1); |
1129 | return ret < 0 ? ret : 0; | |
1da177e4 LT |
1130 | } |
1131 | ||
1132 | static int isofs_bmap(struct inode *inode, sector_t block) | |
1133 | { | |
1134 | struct buffer_head dummy; | |
1135 | int error; | |
1136 | ||
1137 | dummy.b_state = 0; | |
1138 | dummy.b_blocknr = -1000; | |
1139 | error = isofs_get_block(inode, block, &dummy, 0); | |
1140 | if (!error) | |
1141 | return dummy.b_blocknr; | |
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | struct buffer_head *isofs_bread(struct inode *inode, sector_t block) | |
1146 | { | |
1147 | sector_t blknr = isofs_bmap(inode, block); | |
1148 | if (!blknr) | |
1149 | return NULL; | |
1150 | return sb_bread(inode->i_sb, blknr); | |
1151 | } | |
1152 | ||
f132ab7d | 1153 | static int isofs_read_folio(struct file *file, struct folio *folio) |
1da177e4 | 1154 | { |
f132ab7d | 1155 | return mpage_read_folio(folio, isofs_get_block); |
3069083c NJ |
1156 | } |
1157 | ||
d4388340 | 1158 | static void isofs_readahead(struct readahead_control *rac) |
3069083c | 1159 | { |
d4388340 | 1160 | mpage_readahead(rac, isofs_get_block); |
1da177e4 LT |
1161 | } |
1162 | ||
1163 | static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) | |
1164 | { | |
1165 | return generic_block_bmap(mapping,block,isofs_get_block); | |
1166 | } | |
1167 | ||
f5e54d6e | 1168 | static const struct address_space_operations isofs_aops = { |
f132ab7d | 1169 | .read_folio = isofs_read_folio, |
d4388340 | 1170 | .readahead = isofs_readahead, |
1da177e4 LT |
1171 | .bmap = _isofs_bmap |
1172 | }; | |
1173 | ||
9eb7f2c6 | 1174 | static int isofs_read_level3_size(struct inode *inode) |
1da177e4 LT |
1175 | { |
1176 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1177 | int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; | |
c3ed85a3 | 1178 | struct buffer_head *bh = NULL; |
1da177e4 LT |
1179 | unsigned long block, offset, block_saved, offset_saved; |
1180 | int i = 0; | |
1181 | int more_entries = 0; | |
c3ed85a3 | 1182 | struct iso_directory_record *tmpde = NULL; |
1da177e4 LT |
1183 | struct iso_inode_info *ei = ISOFS_I(inode); |
1184 | ||
1185 | inode->i_size = 0; | |
1186 | ||
1187 | /* The first 16 blocks are reserved as the System Area. Thus, | |
1188 | * no inodes can appear in block 0. We use this to flag that | |
1189 | * this is the last section. */ | |
1190 | ei->i_next_section_block = 0; | |
1191 | ei->i_next_section_offset = 0; | |
1192 | ||
1193 | block = ei->i_iget5_block; | |
1194 | offset = ei->i_iget5_offset; | |
1195 | ||
1196 | do { | |
c3ed85a3 | 1197 | struct iso_directory_record *de; |
1da177e4 LT |
1198 | unsigned int de_len; |
1199 | ||
1200 | if (!bh) { | |
1201 | bh = sb_bread(inode->i_sb, block); | |
1202 | if (!bh) | |
1203 | goto out_noread; | |
1204 | } | |
1205 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1206 | de_len = *(unsigned char *) de; | |
1207 | ||
1208 | if (de_len == 0) { | |
1209 | brelse(bh); | |
1210 | bh = NULL; | |
1211 | ++block; | |
1212 | offset = 0; | |
1213 | continue; | |
1214 | } | |
1215 | ||
1216 | block_saved = block; | |
1217 | offset_saved = offset; | |
1218 | offset += de_len; | |
1219 | ||
1220 | /* Make sure we have a full directory entry */ | |
1221 | if (offset >= bufsize) { | |
1222 | int slop = bufsize - offset + de_len; | |
1223 | if (!tmpde) { | |
1224 | tmpde = kmalloc(256, GFP_KERNEL); | |
1225 | if (!tmpde) | |
1226 | goto out_nomem; | |
1227 | } | |
1228 | memcpy(tmpde, de, slop); | |
1229 | offset &= bufsize - 1; | |
1230 | block++; | |
1231 | brelse(bh); | |
1232 | bh = NULL; | |
1233 | if (offset) { | |
1234 | bh = sb_bread(inode->i_sb, block); | |
1235 | if (!bh) | |
1236 | goto out_noread; | |
9eb7f2c6 | 1237 | memcpy((void *)tmpde+slop, bh->b_data, offset); |
1da177e4 LT |
1238 | } |
1239 | de = tmpde; | |
1240 | } | |
1241 | ||
1242 | inode->i_size += isonum_733(de->size); | |
1243 | if (i == 1) { | |
1244 | ei->i_next_section_block = block_saved; | |
1245 | ei->i_next_section_offset = offset_saved; | |
1246 | } | |
1247 | ||
1248 | more_entries = de->flags[-high_sierra] & 0x80; | |
1249 | ||
1250 | i++; | |
9eb7f2c6 | 1251 | if (i > 100) |
1da177e4 | 1252 | goto out_toomany; |
9eb7f2c6 | 1253 | } while (more_entries); |
1da177e4 | 1254 | out: |
9eb7f2c6 | 1255 | kfree(tmpde); |
d4d361ad | 1256 | brelse(bh); |
1da177e4 LT |
1257 | return 0; |
1258 | ||
1259 | out_nomem: | |
d4d361ad | 1260 | brelse(bh); |
1da177e4 LT |
1261 | return -ENOMEM; |
1262 | ||
1263 | out_noread: | |
1264 | printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); | |
f99d49ad | 1265 | kfree(tmpde); |
1da177e4 LT |
1266 | return -EIO; |
1267 | ||
1268 | out_toomany: | |
c3ed85a3 DJ |
1269 | printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" |
1270 | "isofs_read_level3_size: inode=%lu\n", | |
1271 | __func__, inode->i_ino); | |
1da177e4 LT |
1272 | goto out; |
1273 | } | |
1274 | ||
410dd3cf | 1275 | static int isofs_read_inode(struct inode *inode, int relocated) |
1da177e4 LT |
1276 | { |
1277 | struct super_block *sb = inode->i_sb; | |
1278 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
1279 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1280 | unsigned long block; | |
1281 | int high_sierra = sbi->s_high_sierra; | |
def12ec5 | 1282 | struct buffer_head *bh; |
c3ed85a3 DJ |
1283 | struct iso_directory_record *de; |
1284 | struct iso_directory_record *tmpde = NULL; | |
1da177e4 LT |
1285 | unsigned int de_len; |
1286 | unsigned long offset; | |
1287 | struct iso_inode_info *ei = ISOFS_I(inode); | |
c4386c83 | 1288 | int ret = -EIO; |
1da177e4 LT |
1289 | |
1290 | block = ei->i_iget5_block; | |
1291 | bh = sb_bread(inode->i_sb, block); | |
1292 | if (!bh) | |
1293 | goto out_badread; | |
1294 | ||
1295 | offset = ei->i_iget5_offset; | |
1296 | ||
1297 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1298 | de_len = *(unsigned char *) de; | |
e96a1866 JK |
1299 | if (de_len < sizeof(struct iso_directory_record)) |
1300 | goto fail; | |
1da177e4 LT |
1301 | |
1302 | if (offset + de_len > bufsize) { | |
1303 | int frag1 = bufsize - offset; | |
1304 | ||
1305 | tmpde = kmalloc(de_len, GFP_KERNEL); | |
e96e8a1d | 1306 | if (!tmpde) { |
c4386c83 | 1307 | ret = -ENOMEM; |
1da177e4 LT |
1308 | goto fail; |
1309 | } | |
1310 | memcpy(tmpde, bh->b_data + offset, frag1); | |
1311 | brelse(bh); | |
1312 | bh = sb_bread(inode->i_sb, ++block); | |
1313 | if (!bh) | |
1314 | goto out_badread; | |
1315 | memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); | |
1316 | de = tmpde; | |
1317 | } | |
1318 | ||
1319 | inode->i_ino = isofs_get_ino(ei->i_iget5_block, | |
c3ed85a3 DJ |
1320 | ei->i_iget5_offset, |
1321 | ISOFS_BUFFER_BITS(inode)); | |
1da177e4 LT |
1322 | |
1323 | /* Assume it is a normal-format file unless told otherwise */ | |
1324 | ei->i_file_format = isofs_file_normal; | |
1325 | ||
1326 | if (de->flags[-high_sierra] & 2) { | |
52b680c8 JK |
1327 | if (sbi->s_dmode != ISOFS_INVALID_MODE) |
1328 | inode->i_mode = S_IFDIR | sbi->s_dmode; | |
1329 | else | |
1330 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
bfe86848 | 1331 | set_nlink(inode, 1); /* |
c3ed85a3 DJ |
1332 | * Set to 1. We know there are 2, but |
1333 | * the find utility tries to optimize | |
1334 | * if it is 2, and it screws up. It is | |
1335 | * easier to give 1 which tells find to | |
1336 | * do it the hard way. | |
1337 | */ | |
1da177e4 | 1338 | } else { |
52b680c8 JK |
1339 | if (sbi->s_fmode != ISOFS_INVALID_MODE) { |
1340 | inode->i_mode = S_IFREG | sbi->s_fmode; | |
1341 | } else { | |
1342 | /* | |
1343 | * Set default permissions: r-x for all. The disc | |
1344 | * could be shared with DOS machines so virtually | |
1345 | * anything could be a valid executable. | |
1346 | */ | |
1347 | inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; | |
1348 | } | |
bfe86848 | 1349 | set_nlink(inode, 1); |
1da177e4 LT |
1350 | } |
1351 | inode->i_uid = sbi->s_uid; | |
1352 | inode->i_gid = sbi->s_gid; | |
ba52de12 | 1353 | inode->i_blocks = 0; |
1da177e4 LT |
1354 | |
1355 | ei->i_format_parm[0] = 0; | |
1356 | ei->i_format_parm[1] = 0; | |
1357 | ei->i_format_parm[2] = 0; | |
1358 | ||
c3ed85a3 | 1359 | ei->i_section_size = isonum_733(de->size); |
9eb7f2c6 | 1360 | if (de->flags[-high_sierra] & 0x80) { |
c4386c83 DH |
1361 | ret = isofs_read_level3_size(inode); |
1362 | if (ret < 0) | |
c3ed85a3 | 1363 | goto fail; |
c4386c83 | 1364 | ret = -EIO; |
1da177e4 LT |
1365 | } else { |
1366 | ei->i_next_section_block = 0; | |
1367 | ei->i_next_section_offset = 0; | |
c3ed85a3 | 1368 | inode->i_size = isonum_733(de->size); |
1da177e4 LT |
1369 | } |
1370 | ||
1371 | /* | |
1372 | * Some dipshit decided to store some other bit of information | |
1373 | * in the high byte of the file length. Truncate size in case | |
1374 | * this CDROM was mounted with the cruft option. | |
1375 | */ | |
1376 | ||
5404ac8e | 1377 | if (sbi->s_cruft) |
1da177e4 LT |
1378 | inode->i_size &= 0x00ffffff; |
1379 | ||
1380 | if (de->interleave[0]) { | |
c3ed85a3 | 1381 | printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); |
1da177e4 LT |
1382 | inode->i_size = 0; |
1383 | } | |
1384 | ||
1385 | /* I have no idea what file_unit_size is used for, so | |
1386 | we will flag it for now */ | |
1387 | if (de->file_unit_size[0] != 0) { | |
c3ed85a3 DJ |
1388 | printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", |
1389 | inode->i_ino); | |
1da177e4 LT |
1390 | } |
1391 | ||
1392 | /* I have no idea what other flag bits are used for, so | |
1393 | we will flag it for now */ | |
1394 | #ifdef DEBUG | |
1395 | if((de->flags[-high_sierra] & ~2)!= 0){ | |
c3ed85a3 DJ |
1396 | printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " |
1397 | "(%ld %x).\n", | |
1398 | inode->i_ino, de->flags[-high_sierra]); | |
1da177e4 LT |
1399 | } |
1400 | #endif | |
5a4bff92 JL |
1401 | inode_set_mtime_to_ts(inode, |
1402 | inode_set_atime_to_ts(inode, inode_set_ctime(inode, iso_date(de->date, high_sierra), 0))); | |
1da177e4 | 1403 | |
c3ed85a3 DJ |
1404 | ei->i_first_extent = (isonum_733(de->extent) + |
1405 | isonum_711(de->ext_attr_length)); | |
1da177e4 LT |
1406 | |
1407 | /* Set the number of blocks for stat() - should be done before RR */ | |
c3ed85a3 | 1408 | inode->i_blocks = (inode->i_size + 511) >> 9; |
1da177e4 LT |
1409 | |
1410 | /* | |
1411 | * Now test for possible Rock Ridge extensions which will override | |
1412 | * some of these numbers in the inode structure. | |
1413 | */ | |
1414 | ||
1415 | if (!high_sierra) { | |
410dd3cf | 1416 | parse_rock_ridge_inode(de, inode, relocated); |
1da177e4 | 1417 | /* if we want uid/gid set, override the rock ridge setting */ |
5c4a656b JK |
1418 | if (sbi->s_uid_set) |
1419 | inode->i_uid = sbi->s_uid; | |
1420 | if (sbi->s_gid_set) | |
1421 | inode->i_gid = sbi->s_gid; | |
1da177e4 | 1422 | } |
52b680c8 JK |
1423 | /* Now set final access rights if overriding rock ridge setting */ |
1424 | if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && | |
1425 | sbi->s_dmode != ISOFS_INVALID_MODE) | |
1426 | inode->i_mode = S_IFDIR | sbi->s_dmode; | |
1427 | if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && | |
1428 | sbi->s_fmode != ISOFS_INVALID_MODE) | |
1429 | inode->i_mode = S_IFREG | sbi->s_fmode; | |
1da177e4 LT |
1430 | |
1431 | /* Install the inode operations vector */ | |
1432 | if (S_ISREG(inode->i_mode)) { | |
1433 | inode->i_fop = &generic_ro_fops; | |
c3ed85a3 | 1434 | switch (ei->i_file_format) { |
1da177e4 LT |
1435 | #ifdef CONFIG_ZISOFS |
1436 | case isofs_file_compressed: | |
1437 | inode->i_data.a_ops = &zisofs_aops; | |
1438 | break; | |
1439 | #endif | |
1440 | default: | |
1441 | inode->i_data.a_ops = &isofs_aops; | |
1442 | break; | |
1443 | } | |
1444 | } else if (S_ISDIR(inode->i_mode)) { | |
1445 | inode->i_op = &isofs_dir_inode_operations; | |
1446 | inode->i_fop = &isofs_dir_operations; | |
1447 | } else if (S_ISLNK(inode->i_mode)) { | |
1448 | inode->i_op = &page_symlink_inode_operations; | |
21fc61c7 | 1449 | inode_nohighmem(inode); |
1da177e4 LT |
1450 | inode->i_data.a_ops = &isofs_symlink_aops; |
1451 | } else | |
1452 | /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ | |
1453 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
1454 | ||
c4386c83 | 1455 | ret = 0; |
9eb7f2c6 | 1456 | out: |
f99d49ad | 1457 | kfree(tmpde); |
d4d361ad | 1458 | brelse(bh); |
c4386c83 | 1459 | return ret; |
1da177e4 | 1460 | |
9eb7f2c6 | 1461 | out_badread: |
1da177e4 | 1462 | printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); |
9eb7f2c6 | 1463 | fail: |
1da177e4 LT |
1464 | goto out; |
1465 | } | |
1466 | ||
1467 | struct isofs_iget5_callback_data { | |
1468 | unsigned long block; | |
1469 | unsigned long offset; | |
1470 | }; | |
1471 | ||
1472 | static int isofs_iget5_test(struct inode *ino, void *data) | |
1473 | { | |
1474 | struct iso_inode_info *i = ISOFS_I(ino); | |
1475 | struct isofs_iget5_callback_data *d = | |
1476 | (struct isofs_iget5_callback_data*)data; | |
1477 | return (i->i_iget5_block == d->block) | |
c3ed85a3 | 1478 | && (i->i_iget5_offset == d->offset); |
1da177e4 LT |
1479 | } |
1480 | ||
1481 | static int isofs_iget5_set(struct inode *ino, void *data) | |
1482 | { | |
1483 | struct iso_inode_info *i = ISOFS_I(ino); | |
1484 | struct isofs_iget5_callback_data *d = | |
1485 | (struct isofs_iget5_callback_data*)data; | |
1486 | i->i_iget5_block = d->block; | |
1487 | i->i_iget5_offset = d->offset; | |
1488 | return 0; | |
1489 | } | |
1490 | ||
1491 | /* Store, in the inode's containing structure, the block and block | |
1492 | * offset that point to the underlying meta-data for the inode. The | |
1493 | * code below is otherwise similar to the iget() code in | |
1494 | * include/linux/fs.h */ | |
410dd3cf JK |
1495 | struct inode *__isofs_iget(struct super_block *sb, |
1496 | unsigned long block, | |
1497 | unsigned long offset, | |
1498 | int relocated) | |
1da177e4 LT |
1499 | { |
1500 | unsigned long hashval; | |
1501 | struct inode *inode; | |
1502 | struct isofs_iget5_callback_data data; | |
c4386c83 | 1503 | long ret; |
1da177e4 LT |
1504 | |
1505 | if (offset >= 1ul << sb->s_blocksize_bits) | |
c4386c83 | 1506 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
1507 | |
1508 | data.block = block; | |
1509 | data.offset = offset; | |
1510 | ||
1511 | hashval = (block << sb->s_blocksize_bits) | offset; | |
1512 | ||
9eb7f2c6 | 1513 | inode = iget5_locked(sb, hashval, &isofs_iget5_test, |
c3ed85a3 | 1514 | &isofs_iget5_set, &data); |
1da177e4 | 1515 | |
c4386c83 DH |
1516 | if (!inode) |
1517 | return ERR_PTR(-ENOMEM); | |
1518 | ||
1519 | if (inode->i_state & I_NEW) { | |
410dd3cf | 1520 | ret = isofs_read_inode(inode, relocated); |
c4386c83 DH |
1521 | if (ret < 0) { |
1522 | iget_failed(inode); | |
1523 | inode = ERR_PTR(ret); | |
1524 | } else { | |
1525 | unlock_new_inode(inode); | |
1526 | } | |
1da177e4 LT |
1527 | } |
1528 | ||
1529 | return inode; | |
1530 | } | |
1531 | ||
1b17a46c | 1532 | static int isofs_get_tree(struct fs_context *fc) |
1da177e4 | 1533 | { |
1b17a46c ES |
1534 | return get_tree_bdev(fc, isofs_fill_super); |
1535 | } | |
1536 | ||
1537 | static void isofs_free_fc(struct fs_context *fc) | |
1538 | { | |
1539 | kfree(fc->fs_private); | |
1540 | } | |
1541 | ||
1542 | static const struct fs_context_operations isofs_context_ops = { | |
1543 | .parse_param = isofs_parse_param, | |
1544 | .get_tree = isofs_get_tree, | |
1545 | .reconfigure = isofs_reconfigure, | |
1546 | .free = isofs_free_fc, | |
1547 | }; | |
1548 | ||
1549 | static int isofs_init_fs_context(struct fs_context *fc) | |
1550 | { | |
1551 | struct isofs_options *opt; | |
1552 | ||
1553 | opt = kzalloc(sizeof(*opt), GFP_KERNEL); | |
1554 | if (!opt) | |
1555 | return -ENOMEM; | |
1556 | ||
1557 | opt->map = 'n'; | |
1558 | opt->rock = 1; | |
1559 | opt->joliet = 1; | |
1560 | opt->cruft = 0; | |
1561 | opt->hide = 0; | |
1562 | opt->showassoc = 0; | |
1563 | opt->check = 'u'; /* unset */ | |
1564 | opt->nocompress = 0; | |
1565 | opt->blocksize = 1024; | |
1566 | opt->fmode = opt->dmode = ISOFS_INVALID_MODE; | |
1567 | opt->uid_set = 0; | |
1568 | opt->gid_set = 0; | |
1569 | opt->gid = GLOBAL_ROOT_GID; | |
1570 | opt->uid = GLOBAL_ROOT_UID; | |
1571 | opt->iocharset = NULL; | |
1572 | opt->overriderockperm = 0; | |
1573 | opt->session = -1; | |
1574 | opt->sbsector = -1; | |
1575 | ||
1576 | fc->fs_private = opt; | |
1577 | fc->ops = &isofs_context_ops; | |
1578 | ||
1579 | return 0; | |
1da177e4 LT |
1580 | } |
1581 | ||
1582 | static struct file_system_type iso9660_fs_type = { | |
1583 | .owner = THIS_MODULE, | |
1584 | .name = "iso9660", | |
1da177e4 LT |
1585 | .kill_sb = kill_block_super, |
1586 | .fs_flags = FS_REQUIRES_DEV, | |
1b17a46c ES |
1587 | .init_fs_context = isofs_init_fs_context, |
1588 | .parameters = isofs_param_spec, | |
1da177e4 | 1589 | }; |
7f78e035 | 1590 | MODULE_ALIAS_FS("iso9660"); |
fa7614dd | 1591 | MODULE_ALIAS("iso9660"); |
1da177e4 LT |
1592 | |
1593 | static int __init init_iso9660_fs(void) | |
1594 | { | |
1595 | int err = init_inodecache(); | |
1596 | if (err) | |
1597 | goto out; | |
1598 | #ifdef CONFIG_ZISOFS | |
1599 | err = zisofs_init(); | |
1600 | if (err) | |
1601 | goto out1; | |
1602 | #endif | |
1603 | err = register_filesystem(&iso9660_fs_type); | |
1604 | if (err) | |
1605 | goto out2; | |
1606 | return 0; | |
1607 | out2: | |
1608 | #ifdef CONFIG_ZISOFS | |
1609 | zisofs_cleanup(); | |
1610 | out1: | |
1611 | #endif | |
1612 | destroy_inodecache(); | |
1613 | out: | |
1614 | return err; | |
1615 | } | |
1616 | ||
1617 | static void __exit exit_iso9660_fs(void) | |
1618 | { | |
1619 | unregister_filesystem(&iso9660_fs_type); | |
1620 | #ifdef CONFIG_ZISOFS | |
1621 | zisofs_cleanup(); | |
1622 | #endif | |
1623 | destroy_inodecache(); | |
1624 | } | |
1625 | ||
1626 | module_init(init_iso9660_fs) | |
1627 | module_exit(exit_iso9660_fs) | |
1628 | MODULE_LICENSE("GPL"); |