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