Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
| 6 | * 1994 Eberhard Moenkeberg - multi session handling. |
| 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 | |
Al Viro | 94f2f715 | 2005-04-25 18:32:12 -0700 | [diff] [blame] | 14 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/module.h> |
| 16 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/nls.h> |
| 19 | #include <linux/ctype.h> |
| 20 | #include <linux/smp_lock.h> |
Al Viro | 94f2f715 | 2005-04-25 18:32:12 -0700 | [diff] [blame] | 21 | #include <linux/statfs.h> |
| 22 | #include <linux/cdrom.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/parser.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
Al Viro | 94f2f715 | 2005-04-25 18:32:12 -0700 | [diff] [blame] | 25 | #include "isofs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include "zisofs.h" |
| 27 | |
| 28 | #define BEQUIET |
| 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | static int isofs_hashi(struct dentry *parent, struct qstr *qstr); |
| 31 | static int isofs_hash(struct dentry *parent, struct qstr *qstr); |
| 32 | static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b); |
| 33 | static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b); |
| 34 | |
| 35 | #ifdef CONFIG_JOLIET |
| 36 | static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr); |
| 37 | static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr); |
| 38 | static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b); |
| 39 | static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b); |
| 40 | #endif |
| 41 | |
| 42 | static void isofs_put_super(struct super_block *sb) |
| 43 | { |
| 44 | struct isofs_sb_info *sbi = ISOFS_SB(sb); |
| 45 | #ifdef CONFIG_JOLIET |
| 46 | if (sbi->s_nls_iocharset) { |
| 47 | unload_nls(sbi->s_nls_iocharset); |
| 48 | sbi->s_nls_iocharset = NULL; |
| 49 | } |
| 50 | #endif |
| 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | kfree(sbi); |
| 53 | sb->s_fs_info = NULL; |
| 54 | return; |
| 55 | } |
| 56 | |
| 57 | static void isofs_read_inode(struct inode *); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 58 | static int isofs_statfs (struct dentry *, struct kstatfs *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 60 | static struct kmem_cache *isofs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | static struct inode *isofs_alloc_inode(struct super_block *sb) |
| 63 | { |
| 64 | struct iso_inode_info *ei; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 65 | ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | if (!ei) |
| 67 | return NULL; |
| 68 | return &ei->vfs_inode; |
| 69 | } |
| 70 | |
| 71 | static void isofs_destroy_inode(struct inode *inode) |
| 72 | { |
| 73 | kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); |
| 74 | } |
| 75 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 76 | static void init_once(void *foo, struct kmem_cache * cachep, unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | { |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 78 | struct iso_inode_info *ei = foo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| 81 | SLAB_CTOR_CONSTRUCTOR) |
| 82 | inode_init_once(&ei->vfs_inode); |
| 83 | } |
| 84 | |
| 85 | static int init_inodecache(void) |
| 86 | { |
| 87 | isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", |
| 88 | sizeof(struct iso_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 89 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 90 | SLAB_MEM_SPREAD), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | init_once, NULL); |
| 92 | if (isofs_inode_cachep == NULL) |
| 93 | return -ENOMEM; |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | static void destroy_inodecache(void) |
| 98 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 99 | kmem_cache_destroy(isofs_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | static int isofs_remount(struct super_block *sb, int *flags, char *data) |
| 103 | { |
| 104 | /* we probably want a lot more here */ |
| 105 | *flags |= MS_RDONLY; |
| 106 | return 0; |
| 107 | } |
| 108 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame^] | 109 | static const struct super_operations isofs_sops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | .alloc_inode = isofs_alloc_inode, |
| 111 | .destroy_inode = isofs_destroy_inode, |
| 112 | .read_inode = isofs_read_inode, |
| 113 | .put_super = isofs_put_super, |
| 114 | .statfs = isofs_statfs, |
| 115 | .remount_fs = isofs_remount, |
| 116 | }; |
| 117 | |
| 118 | |
| 119 | static struct dentry_operations isofs_dentry_ops[] = { |
| 120 | { |
| 121 | .d_hash = isofs_hash, |
| 122 | .d_compare = isofs_dentry_cmp, |
| 123 | }, |
| 124 | { |
| 125 | .d_hash = isofs_hashi, |
| 126 | .d_compare = isofs_dentry_cmpi, |
| 127 | }, |
| 128 | #ifdef CONFIG_JOLIET |
| 129 | { |
| 130 | .d_hash = isofs_hash_ms, |
| 131 | .d_compare = isofs_dentry_cmp_ms, |
| 132 | }, |
| 133 | { |
| 134 | .d_hash = isofs_hashi_ms, |
| 135 | .d_compare = isofs_dentry_cmpi_ms, |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 136 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | #endif |
| 138 | }; |
| 139 | |
| 140 | struct iso9660_options{ |
| 141 | char map; |
| 142 | char rock; |
| 143 | char joliet; |
| 144 | char cruft; |
Jeremy White | 9769f4e | 2005-06-21 17:16:53 -0700 | [diff] [blame] | 145 | char hide; |
| 146 | char showassoc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | char nocompress; |
| 148 | unsigned char check; |
| 149 | unsigned int blocksize; |
| 150 | mode_t mode; |
| 151 | gid_t gid; |
| 152 | uid_t uid; |
| 153 | char *iocharset; |
| 154 | unsigned char utf8; |
| 155 | /* LVE */ |
| 156 | s32 session; |
| 157 | s32 sbsector; |
| 158 | }; |
| 159 | |
| 160 | /* |
| 161 | * Compute the hash for the isofs name corresponding to the dentry. |
| 162 | */ |
| 163 | static int |
| 164 | isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms) |
| 165 | { |
| 166 | const char *name; |
| 167 | int len; |
| 168 | |
| 169 | len = qstr->len; |
| 170 | name = qstr->name; |
| 171 | if (ms) { |
| 172 | while (len && name[len-1] == '.') |
| 173 | len--; |
| 174 | } |
| 175 | |
| 176 | qstr->hash = full_name_hash(name, len); |
| 177 | |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * Compute the hash for the isofs name corresponding to the dentry. |
| 183 | */ |
| 184 | static int |
| 185 | isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms) |
| 186 | { |
| 187 | const char *name; |
| 188 | int len; |
| 189 | char c; |
| 190 | unsigned long hash; |
| 191 | |
| 192 | len = qstr->len; |
| 193 | name = qstr->name; |
| 194 | if (ms) { |
| 195 | while (len && name[len-1] == '.') |
| 196 | len--; |
| 197 | } |
| 198 | |
| 199 | hash = init_name_hash(); |
| 200 | while (len--) { |
| 201 | c = tolower(*name++); |
| 202 | hash = partial_name_hash(tolower(c), hash); |
| 203 | } |
| 204 | qstr->hash = end_name_hash(hash); |
| 205 | |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * Case insensitive compare of two isofs names. |
| 211 | */ |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 212 | static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a, |
| 213 | struct qstr *b, int ms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | { |
| 215 | int alen, blen; |
| 216 | |
| 217 | /* A filename cannot end in '.' or we treat it like it has none */ |
| 218 | alen = a->len; |
| 219 | blen = b->len; |
| 220 | if (ms) { |
| 221 | while (alen && a->name[alen-1] == '.') |
| 222 | alen--; |
| 223 | while (blen && b->name[blen-1] == '.') |
| 224 | blen--; |
| 225 | } |
| 226 | if (alen == blen) { |
| 227 | if (strnicmp(a->name, b->name, alen) == 0) |
| 228 | return 0; |
| 229 | } |
| 230 | return 1; |
| 231 | } |
| 232 | |
| 233 | /* |
| 234 | * Case sensitive compare of two isofs names. |
| 235 | */ |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 236 | static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a, |
| 237 | struct qstr *b, int ms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | { |
| 239 | int alen, blen; |
| 240 | |
| 241 | /* A filename cannot end in '.' or we treat it like it has none */ |
| 242 | alen = a->len; |
| 243 | blen = b->len; |
| 244 | if (ms) { |
| 245 | while (alen && a->name[alen-1] == '.') |
| 246 | alen--; |
| 247 | while (blen && b->name[blen-1] == '.') |
| 248 | blen--; |
| 249 | } |
| 250 | if (alen == blen) { |
| 251 | if (strncmp(a->name, b->name, alen) == 0) |
| 252 | return 0; |
| 253 | } |
| 254 | return 1; |
| 255 | } |
| 256 | |
| 257 | static int |
| 258 | isofs_hash(struct dentry *dentry, struct qstr *qstr) |
| 259 | { |
| 260 | return isofs_hash_common(dentry, qstr, 0); |
| 261 | } |
| 262 | |
| 263 | static int |
| 264 | isofs_hashi(struct dentry *dentry, struct qstr *qstr) |
| 265 | { |
| 266 | return isofs_hashi_common(dentry, qstr, 0); |
| 267 | } |
| 268 | |
| 269 | static int |
| 270 | isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b) |
| 271 | { |
| 272 | return isofs_dentry_cmp_common(dentry, a, b, 0); |
| 273 | } |
| 274 | |
| 275 | static int |
| 276 | isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b) |
| 277 | { |
| 278 | return isofs_dentry_cmpi_common(dentry, a, b, 0); |
| 279 | } |
| 280 | |
| 281 | #ifdef CONFIG_JOLIET |
| 282 | static int |
| 283 | isofs_hash_ms(struct dentry *dentry, struct qstr *qstr) |
| 284 | { |
| 285 | return isofs_hash_common(dentry, qstr, 1); |
| 286 | } |
| 287 | |
| 288 | static int |
| 289 | isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr) |
| 290 | { |
| 291 | return isofs_hashi_common(dentry, qstr, 1); |
| 292 | } |
| 293 | |
| 294 | static int |
| 295 | isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b) |
| 296 | { |
| 297 | return isofs_dentry_cmp_common(dentry, a, b, 1); |
| 298 | } |
| 299 | |
| 300 | static int |
| 301 | isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b) |
| 302 | { |
| 303 | return isofs_dentry_cmpi_common(dentry, a, b, 1); |
| 304 | } |
| 305 | #endif |
| 306 | |
| 307 | enum { |
| 308 | Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, |
| 309 | Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, |
| 310 | Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, |
Jeremy White | 9769f4e | 2005-06-21 17:16:53 -0700 | [diff] [blame] | 311 | Opt_nocompress, Opt_hide, Opt_showassoc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | }; |
| 313 | |
| 314 | static match_table_t tokens = { |
| 315 | {Opt_norock, "norock"}, |
| 316 | {Opt_nojoliet, "nojoliet"}, |
| 317 | {Opt_unhide, "unhide"}, |
Jeremy White | 9769f4e | 2005-06-21 17:16:53 -0700 | [diff] [blame] | 318 | {Opt_hide, "hide"}, |
| 319 | {Opt_showassoc, "showassoc"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | {Opt_cruft, "cruft"}, |
| 321 | {Opt_utf8, "utf8"}, |
| 322 | {Opt_iocharset, "iocharset=%s"}, |
| 323 | {Opt_map_a, "map=acorn"}, |
| 324 | {Opt_map_a, "map=a"}, |
| 325 | {Opt_map_n, "map=normal"}, |
| 326 | {Opt_map_n, "map=n"}, |
| 327 | {Opt_map_o, "map=off"}, |
| 328 | {Opt_map_o, "map=o"}, |
| 329 | {Opt_session, "session=%u"}, |
| 330 | {Opt_sb, "sbsector=%u"}, |
| 331 | {Opt_check_r, "check=relaxed"}, |
| 332 | {Opt_check_r, "check=r"}, |
| 333 | {Opt_check_s, "check=strict"}, |
| 334 | {Opt_check_s, "check=s"}, |
| 335 | {Opt_uid, "uid=%u"}, |
| 336 | {Opt_gid, "gid=%u"}, |
| 337 | {Opt_mode, "mode=%u"}, |
| 338 | {Opt_block, "block=%u"}, |
| 339 | {Opt_ignore, "conv=binary"}, |
| 340 | {Opt_ignore, "conv=b"}, |
| 341 | {Opt_ignore, "conv=text"}, |
| 342 | {Opt_ignore, "conv=t"}, |
| 343 | {Opt_ignore, "conv=mtext"}, |
| 344 | {Opt_ignore, "conv=m"}, |
| 345 | {Opt_ignore, "conv=auto"}, |
| 346 | {Opt_ignore, "conv=a"}, |
| 347 | {Opt_nocompress, "nocompress"}, |
| 348 | {Opt_err, NULL} |
| 349 | }; |
| 350 | |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 351 | static int parse_options(char *options, struct iso9660_options *popt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | { |
| 353 | char *p; |
| 354 | int option; |
| 355 | |
| 356 | popt->map = 'n'; |
| 357 | popt->rock = 'y'; |
| 358 | popt->joliet = 'y'; |
| 359 | popt->cruft = 'n'; |
Jeremy White | 9769f4e | 2005-06-21 17:16:53 -0700 | [diff] [blame] | 360 | popt->hide = 'n'; |
| 361 | popt->showassoc = 'n'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | popt->check = 'u'; /* unset */ |
| 363 | popt->nocompress = 0; |
| 364 | popt->blocksize = 1024; |
| 365 | popt->mode = S_IRUGO | S_IXUGO; /* r-x for all. The disc could |
| 366 | be shared with DOS machines so |
| 367 | virtually anything could be |
| 368 | a valid executable. */ |
| 369 | popt->gid = 0; |
| 370 | popt->uid = 0; |
| 371 | popt->iocharset = NULL; |
| 372 | popt->utf8 = 0; |
| 373 | popt->session=-1; |
| 374 | popt->sbsector=-1; |
| 375 | if (!options) |
| 376 | return 1; |
| 377 | |
| 378 | while ((p = strsep(&options, ",")) != NULL) { |
| 379 | int token; |
| 380 | substring_t args[MAX_OPT_ARGS]; |
| 381 | unsigned n; |
| 382 | |
| 383 | if (!*p) |
| 384 | continue; |
| 385 | |
| 386 | token = match_token(p, tokens, args); |
| 387 | switch (token) { |
| 388 | case Opt_norock: |
| 389 | popt->rock = 'n'; |
| 390 | break; |
| 391 | case Opt_nojoliet: |
| 392 | popt->joliet = 'n'; |
| 393 | break; |
Jeremy White | 9769f4e | 2005-06-21 17:16:53 -0700 | [diff] [blame] | 394 | case Opt_hide: |
| 395 | popt->hide = 'y'; |
| 396 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | case Opt_unhide: |
Jeremy White | 9769f4e | 2005-06-21 17:16:53 -0700 | [diff] [blame] | 398 | case Opt_showassoc: |
| 399 | popt->showassoc = 'y'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | break; |
| 401 | case Opt_cruft: |
| 402 | popt->cruft = 'y'; |
| 403 | break; |
| 404 | case Opt_utf8: |
| 405 | popt->utf8 = 1; |
| 406 | break; |
| 407 | #ifdef CONFIG_JOLIET |
| 408 | case Opt_iocharset: |
| 409 | popt->iocharset = match_strdup(&args[0]); |
| 410 | break; |
| 411 | #endif |
| 412 | case Opt_map_a: |
| 413 | popt->map = 'a'; |
| 414 | break; |
| 415 | case Opt_map_o: |
| 416 | popt->map = 'o'; |
| 417 | break; |
| 418 | case Opt_map_n: |
| 419 | popt->map = 'n'; |
| 420 | break; |
| 421 | case Opt_session: |
| 422 | if (match_int(&args[0], &option)) |
| 423 | return 0; |
| 424 | n = option; |
| 425 | if (n > 99) |
| 426 | return 0; |
| 427 | popt->session = n + 1; |
| 428 | break; |
| 429 | case Opt_sb: |
| 430 | if (match_int(&args[0], &option)) |
| 431 | return 0; |
| 432 | popt->sbsector = option; |
| 433 | break; |
| 434 | case Opt_check_r: |
| 435 | popt->check = 'r'; |
| 436 | break; |
| 437 | case Opt_check_s: |
| 438 | popt->check = 's'; |
| 439 | break; |
| 440 | case Opt_ignore: |
| 441 | break; |
| 442 | case Opt_uid: |
| 443 | if (match_int(&args[0], &option)) |
| 444 | return 0; |
| 445 | popt->uid = option; |
| 446 | break; |
| 447 | case Opt_gid: |
| 448 | if (match_int(&args[0], &option)) |
| 449 | return 0; |
| 450 | popt->gid = option; |
| 451 | break; |
| 452 | case Opt_mode: |
| 453 | if (match_int(&args[0], &option)) |
| 454 | return 0; |
| 455 | popt->mode = option; |
| 456 | break; |
| 457 | case Opt_block: |
| 458 | if (match_int(&args[0], &option)) |
| 459 | return 0; |
| 460 | n = option; |
| 461 | if (n != 512 && n != 1024 && n != 2048) |
| 462 | return 0; |
| 463 | popt->blocksize = n; |
| 464 | break; |
| 465 | case Opt_nocompress: |
| 466 | popt->nocompress = 1; |
| 467 | break; |
| 468 | default: |
| 469 | return 0; |
| 470 | } |
| 471 | } |
| 472 | return 1; |
| 473 | } |
| 474 | |
| 475 | /* |
| 476 | * look if the driver can tell the multi session redirection value |
| 477 | * |
| 478 | * don't change this if you don't know what you do, please! |
| 479 | * Multisession is legal only with XA disks. |
| 480 | * A non-XA disk with more than one volume descriptor may do it right, but |
| 481 | * usually is written in a nowhere standardized "multi-partition" manner. |
| 482 | * Multisession uses absolute addressing (solely the first frame of the whole |
| 483 | * track is #0), multi-partition uses relative addressing (each first frame of |
| 484 | * each track is #0), and a track is not a session. |
| 485 | * |
| 486 | * A broken CDwriter software or drive firmware does not set new standards, |
| 487 | * at least not if conflicting with the existing ones. |
| 488 | * |
| 489 | * emoenke@gwdg.de |
| 490 | */ |
| 491 | #define WE_OBEY_THE_WRITTEN_STANDARDS 1 |
| 492 | |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 493 | static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | { |
| 495 | struct cdrom_multisession ms_info; |
| 496 | unsigned int vol_desc_start; |
| 497 | struct block_device *bdev = sb->s_bdev; |
| 498 | int i; |
| 499 | |
| 500 | vol_desc_start=0; |
| 501 | ms_info.addr_format=CDROM_LBA; |
| 502 | if(session >= 0 && session <= 99) { |
| 503 | struct cdrom_tocentry Te; |
| 504 | Te.cdte_track=session; |
| 505 | Te.cdte_format=CDROM_LBA; |
| 506 | i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); |
| 507 | if (!i) { |
| 508 | printk(KERN_DEBUG "Session %d start %d type %d\n", |
| 509 | session, Te.cdte_addr.lba, |
| 510 | Te.cdte_ctrl&CDROM_DATA_TRACK); |
| 511 | if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) |
| 512 | return Te.cdte_addr.lba; |
| 513 | } |
| 514 | |
| 515 | printk(KERN_ERR "Invalid session number or type of track\n"); |
| 516 | } |
| 517 | i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 518 | if (session > 0) |
| 519 | printk(KERN_ERR "Invalid session number\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | #if 0 |
| 521 | printk("isofs.inode: CDROMMULTISESSION: rc=%d\n",i); |
| 522 | if (i==0) { |
| 523 | printk("isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); |
| 524 | printk("isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); |
| 525 | } |
| 526 | #endif |
| 527 | if (i==0) |
| 528 | #if WE_OBEY_THE_WRITTEN_STANDARDS |
| 529 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ |
| 530 | #endif |
| 531 | vol_desc_start=ms_info.addr.lba; |
| 532 | return vol_desc_start; |
| 533 | } |
| 534 | |
| 535 | /* |
| 536 | * Initialize the superblock and read the root inode. |
| 537 | * |
| 538 | * Note: a check_disk_change() has been done immediately prior |
| 539 | * to this call, so we don't need to check again. |
| 540 | */ |
| 541 | static int isofs_fill_super(struct super_block *s, void *data, int silent) |
| 542 | { |
| 543 | struct buffer_head * bh = NULL, *pri_bh = NULL; |
| 544 | struct hs_primary_descriptor * h_pri = NULL; |
| 545 | struct iso_primary_descriptor * pri = NULL; |
| 546 | struct iso_supplementary_descriptor *sec = NULL; |
| 547 | struct iso_directory_record * rootp; |
| 548 | int joliet_level = 0; |
| 549 | int iso_blknum, block; |
| 550 | int orig_zonesize; |
| 551 | int table; |
| 552 | unsigned int vol_desc_start; |
| 553 | unsigned long first_data_zone; |
| 554 | struct inode * inode; |
| 555 | struct iso9660_options opt; |
| 556 | struct isofs_sb_info * sbi; |
| 557 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 558 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | if (!sbi) |
| 560 | return -ENOMEM; |
| 561 | s->s_fs_info = sbi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 563 | if (!parse_options((char *)data, &opt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | goto out_freesbi; |
| 565 | |
| 566 | /* |
| 567 | * First of all, get the hardware blocksize for this device. |
| 568 | * If we don't know what it is, or the hardware blocksize is |
| 569 | * larger than the blocksize the user specified, then use |
| 570 | * that value. |
| 571 | */ |
| 572 | /* |
| 573 | * What if bugger tells us to go beyond page size? |
| 574 | */ |
| 575 | opt.blocksize = sb_min_blocksize(s, opt.blocksize); |
| 576 | |
| 577 | sbi->s_high_sierra = 0; /* default is iso9660 */ |
| 578 | |
| 579 | vol_desc_start = (opt.sbsector != -1) ? |
| 580 | opt.sbsector : isofs_get_last_session(s,opt.session); |
| 581 | |
| 582 | for (iso_blknum = vol_desc_start+16; |
| 583 | iso_blknum < vol_desc_start+100; iso_blknum++) |
| 584 | { |
| 585 | struct hs_volume_descriptor * hdp; |
| 586 | struct iso_volume_descriptor * vdp; |
| 587 | |
| 588 | block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); |
| 589 | if (!(bh = sb_bread(s, block))) |
| 590 | goto out_no_read; |
| 591 | |
| 592 | vdp = (struct iso_volume_descriptor *)bh->b_data; |
| 593 | hdp = (struct hs_volume_descriptor *)bh->b_data; |
| 594 | |
| 595 | /* Due to the overlapping physical location of the descriptors, |
| 596 | * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure |
| 597 | * proper identification in this case, we first check for ISO. |
| 598 | */ |
| 599 | if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { |
| 600 | if (isonum_711 (vdp->type) == ISO_VD_END) |
| 601 | break; |
| 602 | if (isonum_711 (vdp->type) == ISO_VD_PRIMARY) { |
| 603 | if (pri == NULL) { |
| 604 | pri = (struct iso_primary_descriptor *)vdp; |
| 605 | /* Save the buffer in case we need it ... */ |
| 606 | pri_bh = bh; |
| 607 | bh = NULL; |
| 608 | } |
| 609 | } |
| 610 | #ifdef CONFIG_JOLIET |
| 611 | else if (isonum_711 (vdp->type) == ISO_VD_SUPPLEMENTARY) { |
| 612 | sec = (struct iso_supplementary_descriptor *)vdp; |
| 613 | if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { |
| 614 | if (opt.joliet == 'y') { |
| 615 | if (sec->escape[2] == 0x40) { |
| 616 | joliet_level = 1; |
| 617 | } else if (sec->escape[2] == 0x43) { |
| 618 | joliet_level = 2; |
| 619 | } else if (sec->escape[2] == 0x45) { |
| 620 | joliet_level = 3; |
| 621 | } |
| 622 | printk(KERN_DEBUG"ISO 9660 Extensions: Microsoft Joliet Level %d\n", |
| 623 | joliet_level); |
| 624 | } |
| 625 | goto root_found; |
| 626 | } else { |
| 627 | /* Unknown supplementary volume descriptor */ |
| 628 | sec = NULL; |
| 629 | } |
| 630 | } |
| 631 | #endif |
| 632 | } else { |
| 633 | if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { |
| 634 | if (isonum_711 (hdp->type) != ISO_VD_PRIMARY) |
| 635 | goto out_freebh; |
| 636 | |
| 637 | sbi->s_high_sierra = 1; |
| 638 | opt.rock = 'n'; |
| 639 | h_pri = (struct hs_primary_descriptor *)vdp; |
| 640 | goto root_found; |
| 641 | } |
| 642 | } |
| 643 | |
| 644 | /* Just skip any volume descriptors we don't recognize */ |
| 645 | |
| 646 | brelse(bh); |
| 647 | bh = NULL; |
| 648 | } |
| 649 | /* |
| 650 | * If we fall through, either no volume descriptor was found, |
| 651 | * or else we passed a primary descriptor looking for others. |
| 652 | */ |
| 653 | if (!pri) |
| 654 | goto out_unknown_format; |
| 655 | brelse(bh); |
| 656 | bh = pri_bh; |
| 657 | pri_bh = NULL; |
| 658 | |
| 659 | root_found: |
| 660 | |
| 661 | if (joliet_level && (pri == NULL || opt.rock == 'n')) { |
| 662 | /* This is the case of Joliet with the norock mount flag. |
| 663 | * A disc with both Joliet and Rock Ridge is handled later |
| 664 | */ |
| 665 | pri = (struct iso_primary_descriptor *) sec; |
| 666 | } |
| 667 | |
| 668 | if(sbi->s_high_sierra){ |
| 669 | rootp = (struct iso_directory_record *) h_pri->root_directory_record; |
| 670 | sbi->s_nzones = isonum_733 (h_pri->volume_space_size); |
| 671 | sbi->s_log_zone_size = isonum_723 (h_pri->logical_block_size); |
| 672 | sbi->s_max_size = isonum_733(h_pri->volume_space_size); |
| 673 | } else { |
| 674 | if (!pri) |
| 675 | goto out_freebh; |
| 676 | rootp = (struct iso_directory_record *) pri->root_directory_record; |
| 677 | sbi->s_nzones = isonum_733 (pri->volume_space_size); |
| 678 | sbi->s_log_zone_size = isonum_723 (pri->logical_block_size); |
| 679 | sbi->s_max_size = isonum_733(pri->volume_space_size); |
| 680 | } |
| 681 | |
| 682 | sbi->s_ninodes = 0; /* No way to figure this out easily */ |
| 683 | |
| 684 | orig_zonesize = sbi->s_log_zone_size; |
| 685 | /* |
| 686 | * If the zone size is smaller than the hardware sector size, |
| 687 | * this is a fatal error. This would occur if the disc drive |
| 688 | * had sectors that were 2048 bytes, but the filesystem had |
| 689 | * blocks that were 512 bytes (which should only very rarely |
| 690 | * happen.) |
| 691 | */ |
| 692 | if(orig_zonesize < opt.blocksize) |
| 693 | goto out_bad_size; |
| 694 | |
| 695 | /* RDE: convert log zone size to bit shift */ |
| 696 | switch (sbi->s_log_zone_size) |
| 697 | { case 512: sbi->s_log_zone_size = 9; break; |
| 698 | case 1024: sbi->s_log_zone_size = 10; break; |
| 699 | case 2048: sbi->s_log_zone_size = 11; break; |
| 700 | |
| 701 | default: |
| 702 | goto out_bad_zone_size; |
| 703 | } |
| 704 | |
| 705 | s->s_magic = ISOFS_SUPER_MAGIC; |
| 706 | s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */ |
| 707 | |
| 708 | /* The CDROM is read-only, has no nodes (devices) on it, and since |
| 709 | all of the files appear to be owned by root, we really do not want |
| 710 | to allow suid. (suid or devices will not show up unless we have |
| 711 | Rock Ridge extensions) */ |
| 712 | |
| 713 | s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */; |
| 714 | |
| 715 | /* Set this for reference. Its not currently used except on write |
| 716 | which we don't have .. */ |
| 717 | |
| 718 | first_data_zone = isonum_733 (rootp->extent) + |
| 719 | isonum_711 (rootp->ext_attr_length); |
| 720 | sbi->s_firstdatazone = first_data_zone; |
| 721 | #ifndef BEQUIET |
| 722 | printk(KERN_DEBUG "Max size:%ld Log zone size:%ld\n", |
| 723 | sbi->s_max_size, |
| 724 | 1UL << sbi->s_log_zone_size); |
| 725 | printk(KERN_DEBUG "First datazone:%ld\n", sbi->s_firstdatazone); |
| 726 | if(sbi->s_high_sierra) |
| 727 | printk(KERN_DEBUG "Disc in High Sierra format.\n"); |
| 728 | #endif |
| 729 | |
| 730 | /* |
| 731 | * If the Joliet level is set, we _may_ decide to use the |
| 732 | * secondary descriptor, but can't be sure until after we |
| 733 | * read the root inode. But before reading the root inode |
| 734 | * we may need to change the device blocksize, and would |
| 735 | * rather release the old buffer first. So, we cache the |
| 736 | * first_data_zone value from the secondary descriptor. |
| 737 | */ |
| 738 | if (joliet_level) { |
| 739 | pri = (struct iso_primary_descriptor *) sec; |
| 740 | rootp = (struct iso_directory_record *) |
| 741 | pri->root_directory_record; |
| 742 | first_data_zone = isonum_733 (rootp->extent) + |
| 743 | isonum_711 (rootp->ext_attr_length); |
| 744 | } |
| 745 | |
| 746 | /* |
| 747 | * We're all done using the volume descriptor, and may need |
| 748 | * to change the device blocksize, so release the buffer now. |
| 749 | */ |
| 750 | brelse(pri_bh); |
| 751 | brelse(bh); |
| 752 | |
| 753 | /* |
| 754 | * Force the blocksize to 512 for 512 byte sectors. The file |
| 755 | * read primitives really get it wrong in a bad way if we don't |
| 756 | * do this. |
| 757 | * |
| 758 | * Note - we should never be setting the blocksize to something |
| 759 | * less than the hardware sector size for the device. If we |
| 760 | * do, we would end up having to read larger buffers and split |
| 761 | * out portions to satisfy requests. |
| 762 | * |
| 763 | * Note2- the idea here is that we want to deal with the optimal |
| 764 | * zonesize in the filesystem. If we have it set to something less, |
| 765 | * then we have horrible problems with trying to piece together |
| 766 | * bits of adjacent blocks in order to properly read directory |
| 767 | * entries. By forcing the blocksize in this way, we ensure |
| 768 | * that we will never be required to do this. |
| 769 | */ |
| 770 | sb_set_blocksize(s, orig_zonesize); |
| 771 | |
| 772 | sbi->s_nls_iocharset = NULL; |
| 773 | |
| 774 | #ifdef CONFIG_JOLIET |
| 775 | if (joliet_level && opt.utf8 == 0) { |
| 776 | char * p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; |
| 777 | sbi->s_nls_iocharset = load_nls(p); |
| 778 | if (! sbi->s_nls_iocharset) { |
| 779 | /* Fail only if explicit charset specified */ |
| 780 | if (opt.iocharset) |
| 781 | goto out_freesbi; |
| 782 | sbi->s_nls_iocharset = load_nls_default(); |
| 783 | } |
| 784 | } |
| 785 | #endif |
| 786 | s->s_op = &isofs_sops; |
| 787 | s->s_export_op = &isofs_export_ops; |
| 788 | sbi->s_mapping = opt.map; |
| 789 | sbi->s_rock = (opt.rock == 'y' ? 2 : 0); |
| 790 | sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ |
| 791 | sbi->s_cruft = opt.cruft; |
Jeremy White | 9769f4e | 2005-06-21 17:16:53 -0700 | [diff] [blame] | 792 | sbi->s_hide = opt.hide; |
| 793 | sbi->s_showassoc = opt.showassoc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | sbi->s_uid = opt.uid; |
| 795 | sbi->s_gid = opt.gid; |
| 796 | sbi->s_utf8 = opt.utf8; |
| 797 | sbi->s_nocompress = opt.nocompress; |
| 798 | /* |
| 799 | * It would be incredibly stupid to allow people to mark every file |
| 800 | * on the disk as suid, so we merely allow them to set the default |
| 801 | * permissions. |
| 802 | */ |
| 803 | sbi->s_mode = opt.mode & 0777; |
| 804 | |
| 805 | /* |
| 806 | * Read the root inode, which _may_ result in changing |
| 807 | * the s_rock flag. Once we have the final s_rock value, |
| 808 | * we then decide whether to use the Joliet descriptor. |
| 809 | */ |
| 810 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); |
| 811 | |
| 812 | /* |
| 813 | * If this disk has both Rock Ridge and Joliet on it, then we |
| 814 | * want to use Rock Ridge by default. This can be overridden |
| 815 | * by using the norock mount option. There is still one other |
| 816 | * possibility that is not taken into account: a Rock Ridge |
| 817 | * CD with Unicode names. Until someone sees such a beast, it |
| 818 | * will not be supported. |
| 819 | */ |
| 820 | if (sbi->s_rock == 1) { |
| 821 | joliet_level = 0; |
| 822 | } else if (joliet_level) { |
| 823 | sbi->s_rock = 0; |
| 824 | if (sbi->s_firstdatazone != first_data_zone) { |
| 825 | sbi->s_firstdatazone = first_data_zone; |
| 826 | printk(KERN_DEBUG |
| 827 | "ISOFS: changing to secondary root\n"); |
| 828 | iput(inode); |
| 829 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); |
| 830 | } |
| 831 | } |
| 832 | |
| 833 | if (opt.check == 'u') { |
| 834 | /* Only Joliet is case insensitive by default */ |
| 835 | if (joliet_level) opt.check = 'r'; |
| 836 | else opt.check = 's'; |
| 837 | } |
| 838 | sbi->s_joliet_level = joliet_level; |
| 839 | |
| 840 | /* check the root inode */ |
| 841 | if (!inode) |
| 842 | goto out_no_root; |
| 843 | if (!inode->i_op) |
| 844 | goto out_bad_root; |
| 845 | /* get the root dentry */ |
| 846 | s->s_root = d_alloc_root(inode); |
| 847 | if (!(s->s_root)) |
| 848 | goto out_no_root; |
| 849 | |
| 850 | table = 0; |
| 851 | if (joliet_level) table += 2; |
| 852 | if (opt.check == 'r') table++; |
| 853 | s->s_root->d_op = &isofs_dentry_ops[table]; |
| 854 | |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 855 | kfree(opt.iocharset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | |
| 857 | return 0; |
| 858 | |
| 859 | /* |
| 860 | * Display error messages and free resources. |
| 861 | */ |
| 862 | out_bad_root: |
| 863 | printk(KERN_WARNING "isofs_fill_super: root inode not initialized\n"); |
| 864 | goto out_iput; |
| 865 | out_no_root: |
| 866 | printk(KERN_WARNING "isofs_fill_super: get root inode failed\n"); |
| 867 | out_iput: |
| 868 | iput(inode); |
| 869 | #ifdef CONFIG_JOLIET |
| 870 | if (sbi->s_nls_iocharset) |
| 871 | unload_nls(sbi->s_nls_iocharset); |
| 872 | #endif |
| 873 | goto out_freesbi; |
| 874 | out_no_read: |
| 875 | printk(KERN_WARNING "isofs_fill_super: " |
| 876 | "bread failed, dev=%s, iso_blknum=%d, block=%d\n", |
| 877 | s->s_id, iso_blknum, block); |
| 878 | goto out_freesbi; |
| 879 | out_bad_zone_size: |
| 880 | printk(KERN_WARNING "Bad logical zone size %ld\n", |
| 881 | sbi->s_log_zone_size); |
| 882 | goto out_freebh; |
| 883 | out_bad_size: |
| 884 | printk(KERN_WARNING "Logical zone size(%d) < hardware blocksize(%u)\n", |
| 885 | orig_zonesize, opt.blocksize); |
| 886 | goto out_freebh; |
| 887 | out_unknown_format: |
| 888 | if (!silent) |
| 889 | printk(KERN_WARNING "Unable to identify CD-ROM format.\n"); |
| 890 | |
| 891 | out_freebh: |
| 892 | brelse(bh); |
| 893 | out_freesbi: |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 894 | kfree(opt.iocharset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | kfree(sbi); |
| 896 | s->s_fs_info = NULL; |
| 897 | return -EINVAL; |
| 898 | } |
| 899 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 900 | static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 902 | struct super_block *sb = dentry->d_sb; |
| 903 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | buf->f_type = ISOFS_SUPER_MAGIC; |
| 905 | buf->f_bsize = sb->s_blocksize; |
| 906 | buf->f_blocks = (ISOFS_SB(sb)->s_nzones |
| 907 | << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); |
| 908 | buf->f_bfree = 0; |
| 909 | buf->f_bavail = 0; |
| 910 | buf->f_files = ISOFS_SB(sb)->s_ninodes; |
| 911 | buf->f_ffree = 0; |
| 912 | buf->f_namelen = NAME_MAX; |
| 913 | return 0; |
| 914 | } |
| 915 | |
| 916 | /* |
| 917 | * Get a set of blocks; filling in buffer_heads if already allocated |
| 918 | * or getblk() if they are not. Returns the number of blocks inserted |
| 919 | * (0 == error.) |
| 920 | */ |
| 921 | int isofs_get_blocks(struct inode *inode, sector_t iblock_s, |
| 922 | struct buffer_head **bh, unsigned long nblocks) |
| 923 | { |
| 924 | unsigned long b_off; |
| 925 | unsigned offset, sect_size; |
| 926 | unsigned int firstext; |
| 927 | unsigned long nextblk, nextoff; |
| 928 | long iblock = (long)iblock_s; |
| 929 | int section, rv; |
| 930 | struct iso_inode_info *ei = ISOFS_I(inode); |
| 931 | |
| 932 | lock_kernel(); |
| 933 | |
| 934 | rv = 0; |
| 935 | if (iblock < 0 || iblock != iblock_s) { |
| 936 | printk("isofs_get_blocks: block number too large\n"); |
| 937 | goto abort; |
| 938 | } |
| 939 | |
| 940 | b_off = iblock; |
| 941 | |
| 942 | offset = 0; |
| 943 | firstext = ei->i_first_extent; |
| 944 | sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); |
| 945 | nextblk = ei->i_next_section_block; |
| 946 | nextoff = ei->i_next_section_offset; |
| 947 | section = 0; |
| 948 | |
| 949 | while ( nblocks ) { |
| 950 | /* If we are *way* beyond the end of the file, print a message. |
| 951 | * Access beyond the end of the file up to the next page boundary |
| 952 | * is normal, however because of the way the page cache works. |
| 953 | * In this case, we just return 0 so that we can properly fill |
| 954 | * the page with useless information without generating any |
| 955 | * I/O errors. |
| 956 | */ |
| 957 | if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { |
| 958 | printk("isofs_get_blocks: block >= EOF (%ld, %ld)\n", |
| 959 | iblock, (unsigned long) inode->i_size); |
| 960 | goto abort; |
| 961 | } |
| 962 | |
Joel & Rebecca VanderZee | fb50ae7 | 2006-09-29 02:00:30 -0700 | [diff] [blame] | 963 | /* On the last section, nextblk == 0, section size is likely to |
| 964 | * exceed sect_size by a partial block, and access beyond the |
| 965 | * end of the file will reach beyond the section size, too. |
| 966 | */ |
| 967 | while (nextblk && (b_off >= (offset + sect_size))) { |
| 968 | struct inode *ninode; |
| 969 | |
| 970 | offset += sect_size; |
| 971 | ninode = isofs_iget(inode->i_sb, nextblk, nextoff); |
| 972 | if (!ninode) |
| 973 | goto abort; |
| 974 | firstext = ISOFS_I(ninode)->i_first_extent; |
| 975 | sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); |
| 976 | nextblk = ISOFS_I(ninode)->i_next_section_block; |
| 977 | nextoff = ISOFS_I(ninode)->i_next_section_offset; |
| 978 | iput(ninode); |
| 979 | |
| 980 | if (++section > 100) { |
| 981 | printk("isofs_get_blocks: More than 100 file sections ?!?, aborting...\n"); |
| 982 | printk("isofs_get_blocks: block=%ld firstext=%u sect_size=%u " |
| 983 | "nextblk=%lu nextoff=%lu\n", |
| 984 | iblock, firstext, (unsigned) sect_size, |
| 985 | nextblk, nextoff); |
| 986 | goto abort; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | } |
| 988 | } |
| 989 | |
| 990 | if ( *bh ) { |
| 991 | map_bh(*bh, inode->i_sb, firstext + b_off - offset); |
| 992 | } else { |
| 993 | *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); |
| 994 | if ( !*bh ) |
| 995 | goto abort; |
| 996 | } |
| 997 | bh++; /* Next buffer head */ |
| 998 | b_off++; /* Next buffer offset */ |
| 999 | nblocks--; |
| 1000 | rv++; |
| 1001 | } |
| 1002 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | abort: |
| 1004 | unlock_kernel(); |
| 1005 | return rv; |
| 1006 | } |
| 1007 | |
| 1008 | /* |
| 1009 | * Used by the standard interfaces. |
| 1010 | */ |
| 1011 | static int isofs_get_block(struct inode *inode, sector_t iblock, |
| 1012 | struct buffer_head *bh_result, int create) |
| 1013 | { |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1014 | if (create) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | printk("isofs_get_block: Kernel tries to allocate a block\n"); |
| 1016 | return -EROFS; |
| 1017 | } |
| 1018 | |
| 1019 | return isofs_get_blocks(inode, iblock, &bh_result, 1) ? 0 : -EIO; |
| 1020 | } |
| 1021 | |
| 1022 | static int isofs_bmap(struct inode *inode, sector_t block) |
| 1023 | { |
| 1024 | struct buffer_head dummy; |
| 1025 | int error; |
| 1026 | |
| 1027 | dummy.b_state = 0; |
| 1028 | dummy.b_blocknr = -1000; |
| 1029 | error = isofs_get_block(inode, block, &dummy, 0); |
| 1030 | if (!error) |
| 1031 | return dummy.b_blocknr; |
| 1032 | return 0; |
| 1033 | } |
| 1034 | |
| 1035 | struct buffer_head *isofs_bread(struct inode *inode, sector_t block) |
| 1036 | { |
| 1037 | sector_t blknr = isofs_bmap(inode, block); |
| 1038 | if (!blknr) |
| 1039 | return NULL; |
| 1040 | return sb_bread(inode->i_sb, blknr); |
| 1041 | } |
| 1042 | |
| 1043 | static int isofs_readpage(struct file *file, struct page *page) |
| 1044 | { |
| 1045 | return block_read_full_page(page,isofs_get_block); |
| 1046 | } |
| 1047 | |
| 1048 | static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) |
| 1049 | { |
| 1050 | return generic_block_bmap(mapping,block,isofs_get_block); |
| 1051 | } |
| 1052 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 1053 | static const struct address_space_operations isofs_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | .readpage = isofs_readpage, |
| 1055 | .sync_page = block_sync_page, |
| 1056 | .bmap = _isofs_bmap |
| 1057 | }; |
| 1058 | |
| 1059 | static inline void test_and_set_uid(uid_t *p, uid_t value) |
| 1060 | { |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1061 | if (value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | *p = value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | } |
| 1064 | |
| 1065 | static inline void test_and_set_gid(gid_t *p, gid_t value) |
| 1066 | { |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1067 | if (value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | *p = value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | } |
| 1070 | |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1071 | static int isofs_read_level3_size(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | { |
| 1073 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); |
| 1074 | int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; |
| 1075 | struct buffer_head * bh = NULL; |
| 1076 | unsigned long block, offset, block_saved, offset_saved; |
| 1077 | int i = 0; |
| 1078 | int more_entries = 0; |
| 1079 | struct iso_directory_record * tmpde = NULL; |
| 1080 | struct iso_inode_info *ei = ISOFS_I(inode); |
| 1081 | |
| 1082 | inode->i_size = 0; |
| 1083 | |
| 1084 | /* The first 16 blocks are reserved as the System Area. Thus, |
| 1085 | * no inodes can appear in block 0. We use this to flag that |
| 1086 | * this is the last section. */ |
| 1087 | ei->i_next_section_block = 0; |
| 1088 | ei->i_next_section_offset = 0; |
| 1089 | |
| 1090 | block = ei->i_iget5_block; |
| 1091 | offset = ei->i_iget5_offset; |
| 1092 | |
| 1093 | do { |
| 1094 | struct iso_directory_record * de; |
| 1095 | unsigned int de_len; |
| 1096 | |
| 1097 | if (!bh) { |
| 1098 | bh = sb_bread(inode->i_sb, block); |
| 1099 | if (!bh) |
| 1100 | goto out_noread; |
| 1101 | } |
| 1102 | de = (struct iso_directory_record *) (bh->b_data + offset); |
| 1103 | de_len = *(unsigned char *) de; |
| 1104 | |
| 1105 | if (de_len == 0) { |
| 1106 | brelse(bh); |
| 1107 | bh = NULL; |
| 1108 | ++block; |
| 1109 | offset = 0; |
| 1110 | continue; |
| 1111 | } |
| 1112 | |
| 1113 | block_saved = block; |
| 1114 | offset_saved = offset; |
| 1115 | offset += de_len; |
| 1116 | |
| 1117 | /* Make sure we have a full directory entry */ |
| 1118 | if (offset >= bufsize) { |
| 1119 | int slop = bufsize - offset + de_len; |
| 1120 | if (!tmpde) { |
| 1121 | tmpde = kmalloc(256, GFP_KERNEL); |
| 1122 | if (!tmpde) |
| 1123 | goto out_nomem; |
| 1124 | } |
| 1125 | memcpy(tmpde, de, slop); |
| 1126 | offset &= bufsize - 1; |
| 1127 | block++; |
| 1128 | brelse(bh); |
| 1129 | bh = NULL; |
| 1130 | if (offset) { |
| 1131 | bh = sb_bread(inode->i_sb, block); |
| 1132 | if (!bh) |
| 1133 | goto out_noread; |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1134 | memcpy((void *)tmpde+slop, bh->b_data, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | } |
| 1136 | de = tmpde; |
| 1137 | } |
| 1138 | |
| 1139 | inode->i_size += isonum_733(de->size); |
| 1140 | if (i == 1) { |
| 1141 | ei->i_next_section_block = block_saved; |
| 1142 | ei->i_next_section_offset = offset_saved; |
| 1143 | } |
| 1144 | |
| 1145 | more_entries = de->flags[-high_sierra] & 0x80; |
| 1146 | |
| 1147 | i++; |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1148 | if (i > 100) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | goto out_toomany; |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1150 | } while (more_entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | out: |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1152 | kfree(tmpde); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | if (bh) |
| 1154 | brelse(bh); |
| 1155 | return 0; |
| 1156 | |
| 1157 | out_nomem: |
| 1158 | if (bh) |
| 1159 | brelse(bh); |
| 1160 | return -ENOMEM; |
| 1161 | |
| 1162 | out_noread: |
| 1163 | printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 1164 | kfree(tmpde); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | return -EIO; |
| 1166 | |
| 1167 | out_toomany: |
| 1168 | printk(KERN_INFO "isofs_read_level3_size: " |
| 1169 | "More than 100 file sections ?!?, aborting...\n" |
| 1170 | "isofs_read_level3_size: inode=%lu\n", |
| 1171 | inode->i_ino); |
| 1172 | goto out; |
| 1173 | } |
| 1174 | |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1175 | static void isofs_read_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | { |
| 1177 | struct super_block *sb = inode->i_sb; |
| 1178 | struct isofs_sb_info *sbi = ISOFS_SB(sb); |
| 1179 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); |
| 1180 | unsigned long block; |
| 1181 | int high_sierra = sbi->s_high_sierra; |
| 1182 | struct buffer_head * bh = NULL; |
| 1183 | struct iso_directory_record * de; |
| 1184 | struct iso_directory_record * tmpde = NULL; |
| 1185 | unsigned int de_len; |
| 1186 | unsigned long offset; |
| 1187 | struct iso_inode_info *ei = ISOFS_I(inode); |
| 1188 | |
| 1189 | block = ei->i_iget5_block; |
| 1190 | bh = sb_bread(inode->i_sb, block); |
| 1191 | if (!bh) |
| 1192 | goto out_badread; |
| 1193 | |
| 1194 | offset = ei->i_iget5_offset; |
| 1195 | |
| 1196 | de = (struct iso_directory_record *) (bh->b_data + offset); |
| 1197 | de_len = *(unsigned char *) de; |
| 1198 | |
| 1199 | if (offset + de_len > bufsize) { |
| 1200 | int frag1 = bufsize - offset; |
| 1201 | |
| 1202 | tmpde = kmalloc(de_len, GFP_KERNEL); |
| 1203 | if (tmpde == NULL) { |
| 1204 | printk(KERN_INFO "isofs_read_inode: out of memory\n"); |
| 1205 | goto fail; |
| 1206 | } |
| 1207 | memcpy(tmpde, bh->b_data + offset, frag1); |
| 1208 | brelse(bh); |
| 1209 | bh = sb_bread(inode->i_sb, ++block); |
| 1210 | if (!bh) |
| 1211 | goto out_badread; |
| 1212 | memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); |
| 1213 | de = tmpde; |
| 1214 | } |
| 1215 | |
| 1216 | inode->i_ino = isofs_get_ino(ei->i_iget5_block, |
| 1217 | ei->i_iget5_offset, |
| 1218 | ISOFS_BUFFER_BITS(inode)); |
| 1219 | |
| 1220 | /* Assume it is a normal-format file unless told otherwise */ |
| 1221 | ei->i_file_format = isofs_file_normal; |
| 1222 | |
| 1223 | if (de->flags[-high_sierra] & 2) { |
| 1224 | inode->i_mode = S_IRUGO | S_IXUGO | S_IFDIR; |
| 1225 | inode->i_nlink = 1; /* Set to 1. We know there are 2, but |
| 1226 | the find utility tries to optimize |
| 1227 | if it is 2, and it screws up. It is |
| 1228 | easier to give 1 which tells find to |
| 1229 | do it the hard way. */ |
| 1230 | } else { |
| 1231 | /* Everybody gets to read the file. */ |
| 1232 | inode->i_mode = sbi->s_mode; |
| 1233 | inode->i_nlink = 1; |
| 1234 | inode->i_mode |= S_IFREG; |
| 1235 | } |
| 1236 | inode->i_uid = sbi->s_uid; |
| 1237 | inode->i_gid = sbi->s_gid; |
Theodore Ts'o | ba52de1 | 2006-09-27 01:50:49 -0700 | [diff] [blame] | 1238 | inode->i_blocks = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | |
| 1240 | ei->i_format_parm[0] = 0; |
| 1241 | ei->i_format_parm[1] = 0; |
| 1242 | ei->i_format_parm[2] = 0; |
| 1243 | |
| 1244 | ei->i_section_size = isonum_733 (de->size); |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1245 | if (de->flags[-high_sierra] & 0x80) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | if(isofs_read_level3_size(inode)) goto fail; |
| 1247 | } else { |
| 1248 | ei->i_next_section_block = 0; |
| 1249 | ei->i_next_section_offset = 0; |
| 1250 | inode->i_size = isonum_733 (de->size); |
| 1251 | } |
| 1252 | |
| 1253 | /* |
| 1254 | * Some dipshit decided to store some other bit of information |
| 1255 | * in the high byte of the file length. Truncate size in case |
| 1256 | * this CDROM was mounted with the cruft option. |
| 1257 | */ |
| 1258 | |
| 1259 | if (sbi->s_cruft == 'y') |
| 1260 | inode->i_size &= 0x00ffffff; |
| 1261 | |
| 1262 | if (de->interleave[0]) { |
| 1263 | printk("Interleaved files not (yet) supported.\n"); |
| 1264 | inode->i_size = 0; |
| 1265 | } |
| 1266 | |
| 1267 | /* I have no idea what file_unit_size is used for, so |
| 1268 | we will flag it for now */ |
| 1269 | if (de->file_unit_size[0] != 0) { |
| 1270 | printk("File unit size != 0 for ISO file (%ld).\n", |
| 1271 | inode->i_ino); |
| 1272 | } |
| 1273 | |
| 1274 | /* I have no idea what other flag bits are used for, so |
| 1275 | we will flag it for now */ |
| 1276 | #ifdef DEBUG |
| 1277 | if((de->flags[-high_sierra] & ~2)!= 0){ |
| 1278 | printk("Unusual flag settings for ISO file (%ld %x).\n", |
| 1279 | inode->i_ino, de->flags[-high_sierra]); |
| 1280 | } |
| 1281 | #endif |
| 1282 | |
| 1283 | inode->i_mtime.tv_sec = |
| 1284 | inode->i_atime.tv_sec = |
| 1285 | inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); |
| 1286 | inode->i_mtime.tv_nsec = |
| 1287 | inode->i_atime.tv_nsec = |
| 1288 | inode->i_ctime.tv_nsec = 0; |
| 1289 | |
| 1290 | ei->i_first_extent = (isonum_733 (de->extent) + |
| 1291 | isonum_711 (de->ext_attr_length)); |
| 1292 | |
| 1293 | /* Set the number of blocks for stat() - should be done before RR */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | inode->i_blocks = (inode->i_size + 511) >> 9; |
| 1295 | |
| 1296 | /* |
| 1297 | * Now test for possible Rock Ridge extensions which will override |
| 1298 | * some of these numbers in the inode structure. |
| 1299 | */ |
| 1300 | |
| 1301 | if (!high_sierra) { |
| 1302 | parse_rock_ridge_inode(de, inode); |
| 1303 | /* if we want uid/gid set, override the rock ridge setting */ |
| 1304 | test_and_set_uid(&inode->i_uid, sbi->s_uid); |
| 1305 | test_and_set_gid(&inode->i_gid, sbi->s_gid); |
| 1306 | } |
| 1307 | |
| 1308 | /* Install the inode operations vector */ |
| 1309 | if (S_ISREG(inode->i_mode)) { |
| 1310 | inode->i_fop = &generic_ro_fops; |
| 1311 | switch ( ei->i_file_format ) { |
| 1312 | #ifdef CONFIG_ZISOFS |
| 1313 | case isofs_file_compressed: |
| 1314 | inode->i_data.a_ops = &zisofs_aops; |
| 1315 | break; |
| 1316 | #endif |
| 1317 | default: |
| 1318 | inode->i_data.a_ops = &isofs_aops; |
| 1319 | break; |
| 1320 | } |
| 1321 | } else if (S_ISDIR(inode->i_mode)) { |
| 1322 | inode->i_op = &isofs_dir_inode_operations; |
| 1323 | inode->i_fop = &isofs_dir_operations; |
| 1324 | } else if (S_ISLNK(inode->i_mode)) { |
| 1325 | inode->i_op = &page_symlink_inode_operations; |
| 1326 | inode->i_data.a_ops = &isofs_symlink_aops; |
| 1327 | } else |
| 1328 | /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ |
| 1329 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
| 1330 | |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1331 | out: |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 1332 | kfree(tmpde); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | if (bh) |
| 1334 | brelse(bh); |
| 1335 | return; |
| 1336 | |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1337 | out_badread: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1339 | fail: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | make_bad_inode(inode); |
| 1341 | goto out; |
| 1342 | } |
| 1343 | |
| 1344 | struct isofs_iget5_callback_data { |
| 1345 | unsigned long block; |
| 1346 | unsigned long offset; |
| 1347 | }; |
| 1348 | |
| 1349 | static int isofs_iget5_test(struct inode *ino, void *data) |
| 1350 | { |
| 1351 | struct iso_inode_info *i = ISOFS_I(ino); |
| 1352 | struct isofs_iget5_callback_data *d = |
| 1353 | (struct isofs_iget5_callback_data*)data; |
| 1354 | return (i->i_iget5_block == d->block) |
| 1355 | && (i->i_iget5_offset == d->offset); |
| 1356 | } |
| 1357 | |
| 1358 | static int isofs_iget5_set(struct inode *ino, void *data) |
| 1359 | { |
| 1360 | struct iso_inode_info *i = ISOFS_I(ino); |
| 1361 | struct isofs_iget5_callback_data *d = |
| 1362 | (struct isofs_iget5_callback_data*)data; |
| 1363 | i->i_iget5_block = d->block; |
| 1364 | i->i_iget5_offset = d->offset; |
| 1365 | return 0; |
| 1366 | } |
| 1367 | |
| 1368 | /* Store, in the inode's containing structure, the block and block |
| 1369 | * offset that point to the underlying meta-data for the inode. The |
| 1370 | * code below is otherwise similar to the iget() code in |
| 1371 | * include/linux/fs.h */ |
| 1372 | struct inode *isofs_iget(struct super_block *sb, |
| 1373 | unsigned long block, |
| 1374 | unsigned long offset) |
| 1375 | { |
| 1376 | unsigned long hashval; |
| 1377 | struct inode *inode; |
| 1378 | struct isofs_iget5_callback_data data; |
| 1379 | |
| 1380 | if (offset >= 1ul << sb->s_blocksize_bits) |
| 1381 | return NULL; |
| 1382 | |
| 1383 | data.block = block; |
| 1384 | data.offset = offset; |
| 1385 | |
| 1386 | hashval = (block << sb->s_blocksize_bits) | offset; |
| 1387 | |
Andrew Morton | 9eb7f2c | 2005-06-21 17:16:49 -0700 | [diff] [blame] | 1388 | inode = iget5_locked(sb, hashval, &isofs_iget5_test, |
| 1389 | &isofs_iget5_set, &data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | |
| 1391 | if (inode && (inode->i_state & I_NEW)) { |
| 1392 | sb->s_op->read_inode(inode); |
| 1393 | unlock_new_inode(inode); |
| 1394 | } |
| 1395 | |
| 1396 | return inode; |
| 1397 | } |
| 1398 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1399 | static int isofs_get_sb(struct file_system_type *fs_type, |
| 1400 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1402 | return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super, |
| 1403 | mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | } |
| 1405 | |
| 1406 | static struct file_system_type iso9660_fs_type = { |
| 1407 | .owner = THIS_MODULE, |
| 1408 | .name = "iso9660", |
| 1409 | .get_sb = isofs_get_sb, |
| 1410 | .kill_sb = kill_block_super, |
| 1411 | .fs_flags = FS_REQUIRES_DEV, |
| 1412 | }; |
| 1413 | |
| 1414 | static int __init init_iso9660_fs(void) |
| 1415 | { |
| 1416 | int err = init_inodecache(); |
| 1417 | if (err) |
| 1418 | goto out; |
| 1419 | #ifdef CONFIG_ZISOFS |
| 1420 | err = zisofs_init(); |
| 1421 | if (err) |
| 1422 | goto out1; |
| 1423 | #endif |
| 1424 | err = register_filesystem(&iso9660_fs_type); |
| 1425 | if (err) |
| 1426 | goto out2; |
| 1427 | return 0; |
| 1428 | out2: |
| 1429 | #ifdef CONFIG_ZISOFS |
| 1430 | zisofs_cleanup(); |
| 1431 | out1: |
| 1432 | #endif |
| 1433 | destroy_inodecache(); |
| 1434 | out: |
| 1435 | return err; |
| 1436 | } |
| 1437 | |
| 1438 | static void __exit exit_iso9660_fs(void) |
| 1439 | { |
| 1440 | unregister_filesystem(&iso9660_fs_type); |
| 1441 | #ifdef CONFIG_ZISOFS |
| 1442 | zisofs_cleanup(); |
| 1443 | #endif |
| 1444 | destroy_inodecache(); |
| 1445 | } |
| 1446 | |
| 1447 | module_init(init_iso9660_fs) |
| 1448 | module_exit(exit_iso9660_fs) |
| 1449 | MODULE_LICENSE("GPL"); |
| 1450 | /* Actual filesystem name is iso9660, as requested in filesystems.c */ |
| 1451 | MODULE_ALIAS("iso9660"); |