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 M��nkeberg - 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 39static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); 40static int isofs_dentry_cmpi(const struct dentry *dentry, 41 unsigned int len, const char *str, const struct qstr *name); 42 43#ifdef CONFIG_JOLIET 44static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); 45static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); 46static int isofs_dentry_cmpi_ms(const struct dentry *dentry, 47 unsigned int len, const char *str, const struct qstr *name); 48static int isofs_dentry_cmp_ms(const struct dentry *dentry, 49 unsigned int len, const char *str, const struct qstr *name); 50#endif 51 52static 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 65static int isofs_read_inode(struct inode *, int relocated); 66static int isofs_statfs (struct dentry *, struct kstatfs *); 67static int isofs_show_options(struct seq_file *, struct dentry *); 68 69static struct kmem_cache *isofs_inode_cachep; 70 71static 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 80static void isofs_free_inode(struct inode *inode) 81{ 82 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); 83} 84 85static void init_once(void *foo) 86{ 87 struct iso_inode_info *ei = foo; 88 89 inode_init_once(&ei->vfs_inode); 90} 91 92static 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 104static 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 114static 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 122static 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 131static 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 148struct 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 */ 174static int 175isofs_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 */ 202static 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 229static int 230isofs_hashi(const struct dentry *dentry, struct qstr *qstr) 231{ 232 return isofs_hashi_common(dentry, qstr, 0); 233} 234 235static int 236isofs_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 */ 246static int 247isofs_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 264static int 265isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) 266{ 267 return isofs_hash_common(dentry, qstr, 1); 268} 269 270static int 271isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) 272{ 273 return isofs_hashi_common(dentry, qstr, 1); 274} 275 276static int 277isofs_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 283static int 284isofs_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 291enum { 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 298static 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 308static const struct constant_table isofs_param_check[] = { 309 {"relaxed", 'r'}, 310 {"r", 'r'}, 311 {"strict", 's'}, 312 {"s", 's'}, 313 {} 314}; 315 316static const struct fs_parameter_spec isofs_param_spec[] = { 317 fsparam_flag ("norock", Opt_norock), 318 fsparam_flag ("nojoliet", Opt_nojoliet), 319 fsparam_flag ("unhide", Opt_unhide), 320 fsparam_flag ("hide", Opt_hide), 321 fsparam_flag ("showassoc", Opt_showassoc), 322 fsparam_flag ("cruft", Opt_cruft), 323 fsparam_flag ("utf8", Opt_utf8), 324 fsparam_string ("iocharset", Opt_iocharset), 325 fsparam_enum ("map", Opt_map, isofs_param_map), 326 fsparam_u32 ("session", Opt_session), 327 fsparam_u32 ("sbsector", Opt_sb), 328 fsparam_enum ("check", Opt_check, isofs_param_check), 329 fsparam_u32 ("uid", Opt_uid), 330 fsparam_u32 ("gid", Opt_gid), 331 /* Note: mode/dmode historically accepted %u not strictly %o */ 332 fsparam_u32 ("mode", Opt_mode), 333 fsparam_u32 ("dmode", Opt_dmode), 334 fsparam_flag ("overriderockperm", Opt_overriderockperm), 335 fsparam_u32 ("block", Opt_block), 336 fsparam_string ("conv", Opt_ignore), 337 fsparam_flag ("nocompress", Opt_nocompress), 338 {} 339}; 340 341static int isofs_parse_param(struct fs_context *fc, 342 struct fs_parameter *param) 343{ 344 struct isofs_options *popt = fc->fs_private; 345 struct fs_parse_result result; 346 int opt; 347 kuid_t uid; 348 kgid_t gid; 349 unsigned int n; 350 351 /* There are no remountable options */ 352 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) 353 return 0; 354 355 opt = fs_parse(fc, isofs_param_spec, param, &result); 356 if (opt < 0) 357 return opt; 358 359 switch (opt) { 360 case Opt_norock: 361 popt->rock = 0; 362 break; 363 case Opt_nojoliet: 364 popt->joliet = 0; 365 break; 366 case Opt_hide: 367 popt->hide = 1; 368 break; 369 case Opt_unhide: 370 case Opt_showassoc: 371 popt->showassoc = 1; 372 break; 373 case Opt_cruft: 374 popt->cruft = 1; 375 break; 376#ifdef CONFIG_JOLIET 377 case Opt_utf8: 378 kfree(popt->iocharset); 379 popt->iocharset = kstrdup("utf8", GFP_KERNEL); 380 if (!popt->iocharset) 381 return -ENOMEM; 382 break; 383 case Opt_iocharset: 384 kfree(popt->iocharset); 385 popt->iocharset = kstrdup(param->string, GFP_KERNEL); 386 if (!popt->iocharset) 387 return -ENOMEM; 388 break; 389#endif 390 case Opt_map: 391 popt->map = result.uint_32; 392 break; 393 case Opt_session: 394 n = result.uint_32; 395 /* 396 * Track numbers are supposed to be in range 1-99, the 397 * mount option starts indexing at 0. 398 */ 399 if (n >= 99) 400 return -EINVAL; 401 popt->session = n + 1; 402 break; 403 case Opt_sb: 404 popt->sbsector = result.uint_32; 405 break; 406 case Opt_check: 407 popt->check = result.uint_32; 408 break; 409 case Opt_ignore: 410 break; 411 case Opt_uid: 412 uid = make_kuid(current_user_ns(), result.uint_32); 413 if (!uid_valid(uid)) 414 return -EINVAL; 415 popt->uid = uid; 416 popt->uid_set = 1; 417 break; 418 case Opt_gid: 419 gid = make_kgid(current_user_ns(), result.uint_32); 420 if (!gid_valid(gid)) 421 return -EINVAL; 422 popt->gid = gid; 423 popt->gid_set = 1; 424 break; 425 case Opt_mode: 426 popt->fmode = result.uint_32; 427 break; 428 case Opt_dmode: 429 popt->dmode = result.uint_32; 430 break; 431 case Opt_overriderockperm: 432 popt->overriderockperm = 1; 433 break; 434 case Opt_block: 435 n = result.uint_32; 436 if (n != 512 && n != 1024 && n != 2048) 437 return -EINVAL; 438 popt->blocksize = n; 439 break; 440 case Opt_nocompress: 441 popt->nocompress = 1; 442 break; 443 default: 444 return -EINVAL; 445 } 446 return 0; 447} 448 449/* 450 * Display the mount options in /proc/mounts. 451 */ 452static int isofs_show_options(struct seq_file *m, struct dentry *root) 453{ 454 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); 455 456 if (!sbi->s_rock) seq_puts(m, ",norock"); 457 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); 458 if (sbi->s_cruft) seq_puts(m, ",cruft"); 459 if (sbi->s_hide) seq_puts(m, ",hide"); 460 if (sbi->s_nocompress) seq_puts(m, ",nocompress"); 461 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); 462 if (sbi->s_showassoc) seq_puts(m, ",showassoc"); 463 464 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); 465 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); 466 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); 467 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); 468 469 if (root->d_sb->s_blocksize != 1024) 470 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); 471 472 if (sbi->s_uid_set) 473 seq_printf(m, ",uid=%u", 474 from_kuid_munged(&init_user_ns, sbi->s_uid)); 475 if (sbi->s_gid_set) 476 seq_printf(m, ",gid=%u", 477 from_kgid_munged(&init_user_ns, sbi->s_gid)); 478 479 if (sbi->s_dmode != ISOFS_INVALID_MODE) 480 seq_printf(m, ",dmode=%o", sbi->s_dmode); 481 if (sbi->s_fmode != ISOFS_INVALID_MODE) 482 seq_printf(m, ",fmode=%o", sbi->s_fmode); 483 484#ifdef CONFIG_JOLIET 485 if (sbi->s_nls_iocharset) 486 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 487 else 488 seq_puts(m, ",iocharset=utf8"); 489#endif 490 return 0; 491} 492 493/* 494 * look if the driver can tell the multi session redirection value 495 * 496 * don't change this if you don't know what you do, please! 497 * Multisession is legal only with XA disks. 498 * A non-XA disk with more than one volume descriptor may do it right, but 499 * usually is written in a nowhere standardized "multi-partition" manner. 500 * Multisession uses absolute addressing (solely the first frame of the whole 501 * track is #0), multi-partition uses relative addressing (each first frame of 502 * each track is #0), and a track is not a session. 503 * 504 * A broken CDwriter software or drive firmware does not set new standards, 505 * at least not if conflicting with the existing ones. 506 * 507 * emoenke@gwdg.de 508 */ 509#define WE_OBEY_THE_WRITTEN_STANDARDS 1 510 511static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 512{ 513 struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); 514 unsigned int vol_desc_start = 0; 515 516 if (session > 0) { 517 struct cdrom_tocentry te; 518 519 if (!cdi) 520 return 0; 521 522 te.cdte_track = session; 523 te.cdte_format = CDROM_LBA; 524 if (cdrom_read_tocentry(cdi, &te) == 0) { 525 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 526 session, te.cdte_addr.lba, 527 te.cdte_ctrl & CDROM_DATA_TRACK); 528 if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4) 529 return te.cdte_addr.lba; 530 } 531 532 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 533 } 534 535 if (cdi) { 536 struct cdrom_multisession ms_info; 537 538 ms_info.addr_format = CDROM_LBA; 539 if (cdrom_multisession(cdi, &ms_info) == 0) { 540#if WE_OBEY_THE_WRITTEN_STANDARDS 541 /* necessary for a valid ms_info.addr */ 542 if (ms_info.xa_flag) 543#endif 544 vol_desc_start = ms_info.addr.lba; 545 } 546 } 547 548 return vol_desc_start; 549} 550 551/* 552 * Check if root directory is empty (has less than 3 files). 553 * 554 * Used to detect broken CDs where ISO root directory is empty but Joliet root 555 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 556 * (and Joliet used instead) or else no files would be visible. 557 */ 558static bool rootdir_empty(struct super_block *sb, unsigned long block) 559{ 560 int offset = 0, files = 0, de_len; 561 struct iso_directory_record *de; 562 struct buffer_head *bh; 563 564 bh = sb_bread(sb, block); 565 if (!bh) 566 return true; 567 while (files < 3) { 568 de = (struct iso_directory_record *) (bh->b_data + offset); 569 de_len = *(unsigned char *) de; 570 if (de_len == 0) 571 break; 572 files++; 573 offset += de_len; 574 } 575 brelse(bh); 576 return files < 3; 577} 578 579/* 580 * Initialize the superblock and read the root inode. 581 */ 582static int isofs_fill_super(struct super_block *s, struct fs_context *fc) 583{ 584 struct buffer_head *bh = NULL, *pri_bh = NULL; 585 struct hs_primary_descriptor *h_pri = NULL; 586 struct iso_primary_descriptor *pri = NULL; 587 struct iso_supplementary_descriptor *sec = NULL; 588 struct iso_directory_record *rootp; 589 struct inode *inode; 590 struct isofs_options *opt = fc->fs_private; 591 struct isofs_sb_info *sbi; 592 unsigned long first_data_zone; 593 int joliet_level = 0; 594 int iso_blknum, block; 595 int orig_zonesize; 596 int table, error = -EINVAL; 597 unsigned int vol_desc_start; 598 int silent = fc->sb_flags & SB_SILENT; 599 600 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 601 if (!sbi) 602 return -ENOMEM; 603 s->s_fs_info = sbi; 604 605 /* 606 * First of all, get the hardware blocksize for this device. 607 * If we don't know what it is, or the hardware blocksize is 608 * larger than the blocksize the user specified, then use 609 * that value. 610 */ 611 /* 612 * What if bugger tells us to go beyond page size? 613 */ 614 if (bdev_logical_block_size(s->s_bdev) > 2048) { 615 printk(KERN_WARNING 616 "ISOFS: unsupported/invalid hardware sector size %d\n", 617 bdev_logical_block_size(s->s_bdev)); 618 goto out_freesbi; 619 } 620 opt->blocksize = sb_min_blocksize(s, opt->blocksize); 621 622 sbi->s_high_sierra = 0; /* default is iso9660 */ 623 sbi->s_session = opt->session; 624 sbi->s_sbsector = opt->sbsector; 625 626 vol_desc_start = (opt->sbsector != -1) ? 627 opt->sbsector : isofs_get_last_session(s, opt->session); 628 629 for (iso_blknum = vol_desc_start+16; 630 iso_blknum < vol_desc_start+100; iso_blknum++) { 631 struct hs_volume_descriptor *hdp; 632 struct iso_volume_descriptor *vdp; 633 634 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 635 if (!(bh = sb_bread(s, block))) 636 goto out_no_read; 637 638 vdp = (struct iso_volume_descriptor *)bh->b_data; 639 hdp = (struct hs_volume_descriptor *)bh->b_data; 640 641 /* 642 * Due to the overlapping physical location of the descriptors, 643 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 644 * proper identification in this case, we first check for ISO. 645 */ 646 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 647 if (isonum_711(vdp->type) == ISO_VD_END) 648 break; 649 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 650 if (!pri) { 651 pri = (struct iso_primary_descriptor *)vdp; 652 /* Save the buffer in case we need it ... */ 653 pri_bh = bh; 654 bh = NULL; 655 } 656 } 657#ifdef CONFIG_JOLIET 658 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 659 sec = (struct iso_supplementary_descriptor *)vdp; 660 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 661 if (opt->joliet) { 662 if (sec->escape[2] == 0x40) 663 joliet_level = 1; 664 else if (sec->escape[2] == 0x43) 665 joliet_level = 2; 666 else if (sec->escape[2] == 0x45) 667 joliet_level = 3; 668 669 printk(KERN_DEBUG "ISO 9660 Extensions: " 670 "Microsoft Joliet Level %d\n", 671 joliet_level); 672 } 673 goto root_found; 674 } else { 675 /* Unknown supplementary volume descriptor */ 676 sec = NULL; 677 } 678 } 679#endif 680 } else { 681 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 682 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 683 goto out_freebh; 684 685 sbi->s_high_sierra = 1; 686 opt->rock = 0; 687 h_pri = (struct hs_primary_descriptor *)vdp; 688 goto root_found; 689 } 690 } 691 692 /* Just skip any volume descriptors we don't recognize */ 693 694 brelse(bh); 695 bh = NULL; 696 } 697 /* 698 * If we fall through, either no volume descriptor was found, 699 * or else we passed a primary descriptor looking for others. 700 */ 701 if (!pri) 702 goto out_unknown_format; 703 brelse(bh); 704 bh = pri_bh; 705 pri_bh = NULL; 706 707root_found: 708 /* We don't support read-write mounts */ 709 if (!sb_rdonly(s)) { 710 error = -EACCES; 711 goto out_freebh; 712 } 713 714 if (joliet_level && (!pri || !opt->rock)) { 715 /* This is the case of Joliet with the norock mount flag. 716 * A disc with both Joliet and Rock Ridge is handled later 717 */ 718 pri = (struct iso_primary_descriptor *) sec; 719 } 720 721 if(sbi->s_high_sierra){ 722 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 723 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 724 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 725 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 726 } else { 727 if (!pri) 728 goto out_freebh; 729 rootp = (struct iso_directory_record *) pri->root_directory_record; 730 sbi->s_nzones = isonum_733(pri->volume_space_size); 731 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 732 sbi->s_max_size = isonum_733(pri->volume_space_size); 733 } 734 735 sbi->s_ninodes = 0; /* No way to figure this out easily */ 736 737 orig_zonesize = sbi->s_log_zone_size; 738 /* 739 * If the zone size is smaller than the hardware sector size, 740 * this is a fatal error. This would occur if the disc drive 741 * had sectors that were 2048 bytes, but the filesystem had 742 * blocks that were 512 bytes (which should only very rarely 743 * happen.) 744 */ 745 if (orig_zonesize < opt->blocksize) 746 goto out_bad_size; 747 748 /* RDE: convert log zone size to bit shift */ 749 switch (sbi->s_log_zone_size) { 750 case 512: sbi->s_log_zone_size = 9; break; 751 case 1024: sbi->s_log_zone_size = 10; break; 752 case 2048: sbi->s_log_zone_size = 11; break; 753 754 default: 755 goto out_bad_zone_size; 756 } 757 758 s->s_magic = ISOFS_SUPER_MAGIC; 759 760 /* 761 * With multi-extent files, file size is only limited by the maximum 762 * size of a file system, which is 8 TB. 763 */ 764 s->s_maxbytes = 0x80000000000LL; 765 766 /* ECMA-119 timestamp from 1900/1/1 with tz offset */ 767 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET; 768 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET; 769 770 /* Set this for reference. Its not currently used except on write 771 which we don't have .. */ 772 773 first_data_zone = isonum_733(rootp->extent) + 774 isonum_711(rootp->ext_attr_length); 775 sbi->s_firstdatazone = first_data_zone; 776#ifndef BEQUIET 777 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 778 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 779 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 780 if(sbi->s_high_sierra) 781 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 782#endif 783 784 /* 785 * If the Joliet level is set, we _may_ decide to use the 786 * secondary descriptor, but can't be sure until after we 787 * read the root inode. But before reading the root inode 788 * we may need to change the device blocksize, and would 789 * rather release the old buffer first. So, we cache the 790 * first_data_zone value from the secondary descriptor. 791 */ 792 if (joliet_level) { 793 pri = (struct iso_primary_descriptor *) sec; 794 rootp = (struct iso_directory_record *) 795 pri->root_directory_record; 796 first_data_zone = isonum_733(rootp->extent) + 797 isonum_711(rootp->ext_attr_length); 798 } 799 800 /* 801 * We're all done using the volume descriptor, and may need 802 * to change the device blocksize, so release the buffer now. 803 */ 804 brelse(pri_bh); 805 brelse(bh); 806 807 /* 808 * Force the blocksize to 512 for 512 byte sectors. The file 809 * read primitives really get it wrong in a bad way if we don't 810 * do this. 811 * 812 * Note - we should never be setting the blocksize to something 813 * less than the hardware sector size for the device. If we 814 * do, we would end up having to read larger buffers and split 815 * out portions to satisfy requests. 816 * 817 * Note2- the idea here is that we want to deal with the optimal 818 * zonesize in the filesystem. If we have it set to something less, 819 * then we have horrible problems with trying to piece together 820 * bits of adjacent blocks in order to properly read directory 821 * entries. By forcing the blocksize in this way, we ensure 822 * that we will never be required to do this. 823 */ 824 sb_set_blocksize(s, orig_zonesize); 825 826 sbi->s_nls_iocharset = NULL; 827 828#ifdef CONFIG_JOLIET 829 if (joliet_level) { 830 char *p = opt->iocharset ? opt->iocharset : CONFIG_NLS_DEFAULT; 831 if (strcmp(p, "utf8") != 0) { 832 sbi->s_nls_iocharset = opt->iocharset ? 833 load_nls(opt->iocharset) : load_nls_default(); 834 if (!sbi->s_nls_iocharset) 835 goto out_freesbi; 836 } 837 } 838#endif 839 s->s_op = &isofs_sops; 840 s->s_export_op = &isofs_export_ops; 841 sbi->s_mapping = opt->map; 842 sbi->s_rock = (opt->rock ? 2 : 0); 843 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 844 sbi->s_cruft = opt->cruft; 845 sbi->s_hide = opt->hide; 846 sbi->s_showassoc = opt->showassoc; 847 sbi->s_uid = opt->uid; 848 sbi->s_gid = opt->gid; 849 sbi->s_uid_set = opt->uid_set; 850 sbi->s_gid_set = opt->gid_set; 851 sbi->s_nocompress = opt->nocompress; 852 sbi->s_overriderockperm = opt->overriderockperm; 853 /* 854 * It would be incredibly stupid to allow people to mark every file 855 * on the disk as suid, so we merely allow them to set the default 856 * permissions. 857 */ 858 if (opt->fmode != ISOFS_INVALID_MODE) 859 sbi->s_fmode = opt->fmode & 0777; 860 else 861 sbi->s_fmode = ISOFS_INVALID_MODE; 862 if (opt->dmode != ISOFS_INVALID_MODE) 863 sbi->s_dmode = opt->dmode & 0777; 864 else 865 sbi->s_dmode = ISOFS_INVALID_MODE; 866 867 /* 868 * Read the root inode, which _may_ result in changing 869 * the s_rock flag. Once we have the final s_rock value, 870 * we then decide whether to use the Joliet descriptor. 871 */ 872 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 873 874 /* 875 * Fix for broken CDs with a corrupt root inode but a correct Joliet 876 * root directory. 877 */ 878 if (IS_ERR(inode)) { 879 if (joliet_level && sbi->s_firstdatazone != first_data_zone) { 880 printk(KERN_NOTICE 881 "ISOFS: root inode is unusable. " 882 "Disabling Rock Ridge and switching to Joliet."); 883 sbi->s_rock = 0; 884 inode = NULL; 885 } else { 886 goto out_no_root; 887 } 888 } 889 890 /* 891 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 892 * correct Joliet root directory. 893 */ 894 if (sbi->s_rock == 1 && joliet_level && 895 rootdir_empty(s, sbi->s_firstdatazone)) { 896 printk(KERN_NOTICE 897 "ISOFS: primary root directory is empty. " 898 "Disabling Rock Ridge and switching to Joliet."); 899 sbi->s_rock = 0; 900 } 901 902 /* 903 * If this disk has both Rock Ridge and Joliet on it, then we 904 * want to use Rock Ridge by default. This can be overridden 905 * by using the norock mount option. There is still one other 906 * possibility that is not taken into account: a Rock Ridge 907 * CD with Unicode names. Until someone sees such a beast, it 908 * will not be supported. 909 */ 910 if (sbi->s_rock == 1) { 911 joliet_level = 0; 912 } else if (joliet_level) { 913 sbi->s_rock = 0; 914 if (sbi->s_firstdatazone != first_data_zone) { 915 sbi->s_firstdatazone = first_data_zone; 916 printk(KERN_DEBUG 917 "ISOFS: changing to secondary root\n"); 918 iput(inode); 919 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 920 if (IS_ERR(inode)) 921 goto out_no_root; 922 } 923 } 924 925 if (opt->check == 'u') { 926 /* Only Joliet is case insensitive by default */ 927 if (joliet_level) 928 opt->check = 'r'; 929 else 930 opt->check = 's'; 931 } 932 sbi->s_joliet_level = joliet_level; 933 934 /* Make sure the root inode is a directory */ 935 if (!S_ISDIR(inode->i_mode)) { 936 printk(KERN_WARNING 937 "isofs_fill_super: root inode is not a directory. " 938 "Corrupted media?\n"); 939 goto out_iput; 940 } 941 942 table = 0; 943 if (joliet_level) 944 table += 2; 945 if (opt->check == 'r') 946 table++; 947 sbi->s_check = opt->check; 948 949 if (table) 950 s->s_d_op = &isofs_dentry_ops[table - 1]; 951 952 /* get the root dentry */ 953 s->s_root = d_make_root(inode); 954 if (!(s->s_root)) { 955 error = -ENOMEM; 956 goto out_no_inode; 957 } 958 959 kfree(opt->iocharset); 960 961 return 0; 962 963 /* 964 * Display error messages and free resources. 965 */ 966out_iput: 967 iput(inode); 968 goto out_no_inode; 969out_no_root: 970 error = PTR_ERR(inode); 971 if (error != -ENOMEM) 972 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 973out_no_inode: 974#ifdef CONFIG_JOLIET 975 unload_nls(sbi->s_nls_iocharset); 976#endif 977 goto out_freesbi; 978out_no_read: 979 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 980 __func__, s->s_id, iso_blknum, block); 981 goto out_freebh; 982out_bad_zone_size: 983 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 984 sbi->s_log_zone_size); 985 goto out_freebh; 986out_bad_size: 987 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 988 orig_zonesize, opt->blocksize); 989 goto out_freebh; 990out_unknown_format: 991 if (!silent) 992 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 993 994out_freebh: 995 brelse(bh); 996 brelse(pri_bh); 997out_freesbi: 998 kfree(opt->iocharset); 999 kfree(sbi); 1000 s->s_fs_info = NULL; 1001 return error; 1002} 1003 1004static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1005{ 1006 struct super_block *sb = dentry->d_sb; 1007 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1008 1009 buf->f_type = ISOFS_SUPER_MAGIC; 1010 buf->f_bsize = sb->s_blocksize; 1011 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1012 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1013 buf->f_bfree = 0; 1014 buf->f_bavail = 0; 1015 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1016 buf->f_ffree = 0; 1017 buf->f_fsid = u64_to_fsid(id); 1018 buf->f_namelen = NAME_MAX; 1019 return 0; 1020} 1021 1022/* 1023 * Get a set of blocks; filling in buffer_heads if already allocated 1024 * or getblk() if they are not. Returns the number of blocks inserted 1025 * (-ve == error.) 1026 */ 1027int isofs_get_blocks(struct inode *inode, sector_t iblock, 1028 struct buffer_head **bh, unsigned long nblocks) 1029{ 1030 unsigned long b_off = iblock; 1031 unsigned offset, sect_size; 1032 unsigned int firstext; 1033 unsigned long nextblk, nextoff; 1034 int section, rv, error; 1035 struct iso_inode_info *ei = ISOFS_I(inode); 1036 1037 error = -EIO; 1038 rv = 0; 1039 if (iblock != b_off) { 1040 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1041 goto abort; 1042 } 1043 1044 1045 offset = 0; 1046 firstext = ei->i_first_extent; 1047 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1048 nextblk = ei->i_next_section_block; 1049 nextoff = ei->i_next_section_offset; 1050 section = 0; 1051 1052 while (nblocks) { 1053 /* If we are *way* beyond the end of the file, print a message. 1054 * Access beyond the end of the file up to the next page boundary 1055 * is normal, however because of the way the page cache works. 1056 * In this case, we just return 0 so that we can properly fill 1057 * the page with useless information without generating any 1058 * I/O errors. 1059 */ 1060 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1061 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1062 __func__, b_off, 1063 (unsigned long long)inode->i_size); 1064 goto abort; 1065 } 1066 1067 /* On the last section, nextblk == 0, section size is likely to 1068 * exceed sect_size by a partial block, and access beyond the 1069 * end of the file will reach beyond the section size, too. 1070 */ 1071 while (nextblk && (b_off >= (offset + sect_size))) { 1072 struct inode *ninode; 1073 1074 offset += sect_size; 1075 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1076 if (IS_ERR(ninode)) { 1077 error = PTR_ERR(ninode); 1078 goto abort; 1079 } 1080 firstext = ISOFS_I(ninode)->i_first_extent; 1081 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1082 nextblk = ISOFS_I(ninode)->i_next_section_block; 1083 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1084 iput(ninode); 1085 1086 if (++section > 100) { 1087 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1088 " aborting...\n", __func__); 1089 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1090 "nextblk=%lu nextoff=%lu\n", __func__, 1091 b_off, firstext, (unsigned) sect_size, 1092 nextblk, nextoff); 1093 goto abort; 1094 } 1095 } 1096 1097 if (*bh) { 1098 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1099 } else { 1100 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1101 if (!*bh) 1102 goto abort; 1103 } 1104 bh++; /* Next buffer head */ 1105 b_off++; /* Next buffer offset */ 1106 nblocks--; 1107 rv++; 1108 } 1109 1110 error = 0; 1111abort: 1112 return rv != 0 ? rv : error; 1113} 1114 1115/* 1116 * Used by the standard interfaces. 1117 */ 1118static int isofs_get_block(struct inode *inode, sector_t iblock, 1119 struct buffer_head *bh_result, int create) 1120{ 1121 int ret; 1122 1123 if (create) { 1124 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1125 return -EROFS; 1126 } 1127 1128 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1129 return ret < 0 ? ret : 0; 1130} 1131 1132static int isofs_bmap(struct inode *inode, sector_t block) 1133{ 1134 struct buffer_head dummy; 1135 int error; 1136 1137 dummy.b_state = 0; 1138 dummy.b_blocknr = -1000; 1139 error = isofs_get_block(inode, block, &dummy, 0); 1140 if (!error) 1141 return dummy.b_blocknr; 1142 return 0; 1143} 1144 1145struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1146{ 1147 sector_t blknr = isofs_bmap(inode, block); 1148 if (!blknr) 1149 return NULL; 1150 return sb_bread(inode->i_sb, blknr); 1151} 1152 1153static int isofs_read_folio(struct file *file, struct folio *folio) 1154{ 1155 return mpage_read_folio(folio, isofs_get_block); 1156} 1157 1158static void isofs_readahead(struct readahead_control *rac) 1159{ 1160 mpage_readahead(rac, isofs_get_block); 1161} 1162 1163static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1164{ 1165 return generic_block_bmap(mapping,block,isofs_get_block); 1166} 1167 1168static const struct address_space_operations isofs_aops = { 1169 .read_folio = isofs_read_folio, 1170 .readahead = isofs_readahead, 1171 .bmap = _isofs_bmap 1172}; 1173 1174static int isofs_read_level3_size(struct inode *inode) 1175{ 1176 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1177 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1178 struct buffer_head *bh = NULL; 1179 unsigned long block, offset, block_saved, offset_saved; 1180 int i = 0; 1181 int more_entries = 0; 1182 struct iso_directory_record *tmpde = NULL; 1183 struct iso_inode_info *ei = ISOFS_I(inode); 1184 1185 inode->i_size = 0; 1186 1187 /* The first 16 blocks are reserved as the System Area. Thus, 1188 * no inodes can appear in block 0. We use this to flag that 1189 * this is the last section. */ 1190 ei->i_next_section_block = 0; 1191 ei->i_next_section_offset = 0; 1192 1193 block = ei->i_iget5_block; 1194 offset = ei->i_iget5_offset; 1195 1196 do { 1197 struct iso_directory_record *de; 1198 unsigned int de_len; 1199 1200 if (!bh) { 1201 bh = sb_bread(inode->i_sb, block); 1202 if (!bh) 1203 goto out_noread; 1204 } 1205 de = (struct iso_directory_record *) (bh->b_data + offset); 1206 de_len = *(unsigned char *) de; 1207 1208 if (de_len == 0) { 1209 brelse(bh); 1210 bh = NULL; 1211 ++block; 1212 offset = 0; 1213 continue; 1214 } 1215 1216 block_saved = block; 1217 offset_saved = offset; 1218 offset += de_len; 1219 1220 /* Make sure we have a full directory entry */ 1221 if (offset >= bufsize) { 1222 int slop = bufsize - offset + de_len; 1223 if (!tmpde) { 1224 tmpde = kmalloc(256, GFP_KERNEL); 1225 if (!tmpde) 1226 goto out_nomem; 1227 } 1228 memcpy(tmpde, de, slop); 1229 offset &= bufsize - 1; 1230 block++; 1231 brelse(bh); 1232 bh = NULL; 1233 if (offset) { 1234 bh = sb_bread(inode->i_sb, block); 1235 if (!bh) 1236 goto out_noread; 1237 memcpy((void *)tmpde+slop, bh->b_data, offset); 1238 } 1239 de = tmpde; 1240 } 1241 1242 inode->i_size += isonum_733(de->size); 1243 if (i == 1) { 1244 ei->i_next_section_block = block_saved; 1245 ei->i_next_section_offset = offset_saved; 1246 } 1247 1248 more_entries = de->flags[-high_sierra] & 0x80; 1249 1250 i++; 1251 if (i > 100) 1252 goto out_toomany; 1253 } while (more_entries); 1254out: 1255 kfree(tmpde); 1256 brelse(bh); 1257 return 0; 1258 1259out_nomem: 1260 brelse(bh); 1261 return -ENOMEM; 1262 1263out_noread: 1264 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1265 kfree(tmpde); 1266 return -EIO; 1267 1268out_toomany: 1269 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1270 "isofs_read_level3_size: inode=%lu\n", 1271 __func__, inode->i_ino); 1272 goto out; 1273} 1274 1275static int isofs_read_inode(struct inode *inode, int relocated) 1276{ 1277 struct super_block *sb = inode->i_sb; 1278 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1279 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1280 unsigned long block; 1281 int high_sierra = sbi->s_high_sierra; 1282 struct buffer_head *bh; 1283 struct iso_directory_record *de; 1284 struct iso_directory_record *tmpde = NULL; 1285 unsigned int de_len; 1286 unsigned long offset; 1287 struct iso_inode_info *ei = ISOFS_I(inode); 1288 int ret = -EIO; 1289 1290 block = ei->i_iget5_block; 1291 bh = sb_bread(inode->i_sb, block); 1292 if (!bh) 1293 goto out_badread; 1294 1295 offset = ei->i_iget5_offset; 1296 1297 de = (struct iso_directory_record *) (bh->b_data + offset); 1298 de_len = *(unsigned char *) de; 1299 if (de_len < sizeof(struct iso_directory_record)) 1300 goto fail; 1301 1302 if (offset + de_len > bufsize) { 1303 int frag1 = bufsize - offset; 1304 1305 tmpde = kmalloc(de_len, GFP_KERNEL); 1306 if (!tmpde) { 1307 ret = -ENOMEM; 1308 goto fail; 1309 } 1310 memcpy(tmpde, bh->b_data + offset, frag1); 1311 brelse(bh); 1312 bh = sb_bread(inode->i_sb, ++block); 1313 if (!bh) 1314 goto out_badread; 1315 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1316 de = tmpde; 1317 } 1318 1319 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1320 ei->i_iget5_offset, 1321 ISOFS_BUFFER_BITS(inode)); 1322 1323 /* Assume it is a normal-format file unless told otherwise */ 1324 ei->i_file_format = isofs_file_normal; 1325 1326 if (de->flags[-high_sierra] & 2) { 1327 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1328 inode->i_mode = S_IFDIR | sbi->s_dmode; 1329 else 1330 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1331 set_nlink(inode, 1); /* 1332 * Set to 1. We know there are 2, but 1333 * the find utility tries to optimize 1334 * if it is 2, and it screws up. It is 1335 * easier to give 1 which tells find to 1336 * do it the hard way. 1337 */ 1338 } else { 1339 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1340 inode->i_mode = S_IFREG | sbi->s_fmode; 1341 } else { 1342 /* 1343 * Set default permissions: r-x for all. The disc 1344 * could be shared with DOS machines so virtually 1345 * anything could be a valid executable. 1346 */ 1347 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1348 } 1349 set_nlink(inode, 1); 1350 } 1351 inode->i_uid = sbi->s_uid; 1352 inode->i_gid = sbi->s_gid; 1353 inode->i_blocks = 0; 1354 1355 ei->i_format_parm[0] = 0; 1356 ei->i_format_parm[1] = 0; 1357 ei->i_format_parm[2] = 0; 1358 1359 ei->i_section_size = isonum_733(de->size); 1360 if (de->flags[-high_sierra] & 0x80) { 1361 ret = isofs_read_level3_size(inode); 1362 if (ret < 0) 1363 goto fail; 1364 ret = -EIO; 1365 } else { 1366 ei->i_next_section_block = 0; 1367 ei->i_next_section_offset = 0; 1368 inode->i_size = isonum_733(de->size); 1369 } 1370 1371 /* 1372 * Some dipshit decided to store some other bit of information 1373 * in the high byte of the file length. Truncate size in case 1374 * this CDROM was mounted with the cruft option. 1375 */ 1376 1377 if (sbi->s_cruft) 1378 inode->i_size &= 0x00ffffff; 1379 1380 if (de->interleave[0]) { 1381 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1382 inode->i_size = 0; 1383 } 1384 1385 /* I have no idea what file_unit_size is used for, so 1386 we will flag it for now */ 1387 if (de->file_unit_size[0] != 0) { 1388 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1389 inode->i_ino); 1390 } 1391 1392 /* I have no idea what other flag bits are used for, so 1393 we will flag it for now */ 1394#ifdef DEBUG 1395 if((de->flags[-high_sierra] & ~2)!= 0){ 1396 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1397 "(%ld %x).\n", 1398 inode->i_ino, de->flags[-high_sierra]); 1399 } 1400#endif 1401 inode_set_mtime_to_ts(inode, 1402 inode_set_atime_to_ts(inode, inode_set_ctime(inode, iso_date(de->date, high_sierra), 0))); 1403 1404 ei->i_first_extent = (isonum_733(de->extent) + 1405 isonum_711(de->ext_attr_length)); 1406 1407 /* Set the number of blocks for stat() - should be done before RR */ 1408 inode->i_blocks = (inode->i_size + 511) >> 9; 1409 1410 /* 1411 * Now test for possible Rock Ridge extensions which will override 1412 * some of these numbers in the inode structure. 1413 */ 1414 1415 if (!high_sierra) { 1416 parse_rock_ridge_inode(de, inode, relocated); 1417 /* if we want uid/gid set, override the rock ridge setting */ 1418 if (sbi->s_uid_set) 1419 inode->i_uid = sbi->s_uid; 1420 if (sbi->s_gid_set) 1421 inode->i_gid = sbi->s_gid; 1422 } 1423 /* Now set final access rights if overriding rock ridge setting */ 1424 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1425 sbi->s_dmode != ISOFS_INVALID_MODE) 1426 inode->i_mode = S_IFDIR | sbi->s_dmode; 1427 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1428 sbi->s_fmode != ISOFS_INVALID_MODE) 1429 inode->i_mode = S_IFREG | sbi->s_fmode; 1430 1431 /* Install the inode operations vector */ 1432 if (S_ISREG(inode->i_mode)) { 1433 inode->i_fop = &generic_ro_fops; 1434 switch (ei->i_file_format) { 1435#ifdef CONFIG_ZISOFS 1436 case isofs_file_compressed: 1437 inode->i_data.a_ops = &zisofs_aops; 1438 break; 1439#endif 1440 default: 1441 inode->i_data.a_ops = &isofs_aops; 1442 break; 1443 } 1444 } else if (S_ISDIR(inode->i_mode)) { 1445 inode->i_op = &isofs_dir_inode_operations; 1446 inode->i_fop = &isofs_dir_operations; 1447 } else if (S_ISLNK(inode->i_mode)) { 1448 inode->i_op = &page_symlink_inode_operations; 1449 inode_nohighmem(inode); 1450 inode->i_data.a_ops = &isofs_symlink_aops; 1451 } else 1452 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1453 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1454 1455 ret = 0; 1456out: 1457 kfree(tmpde); 1458 brelse(bh); 1459 return ret; 1460 1461out_badread: 1462 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1463fail: 1464 goto out; 1465} 1466 1467struct isofs_iget5_callback_data { 1468 unsigned long block; 1469 unsigned long offset; 1470}; 1471 1472static int isofs_iget5_test(struct inode *ino, void *data) 1473{ 1474 struct iso_inode_info *i = ISOFS_I(ino); 1475 struct isofs_iget5_callback_data *d = 1476 (struct isofs_iget5_callback_data*)data; 1477 return (i->i_iget5_block == d->block) 1478 && (i->i_iget5_offset == d->offset); 1479} 1480 1481static int isofs_iget5_set(struct inode *ino, void *data) 1482{ 1483 struct iso_inode_info *i = ISOFS_I(ino); 1484 struct isofs_iget5_callback_data *d = 1485 (struct isofs_iget5_callback_data*)data; 1486 i->i_iget5_block = d->block; 1487 i->i_iget5_offset = d->offset; 1488 return 0; 1489} 1490 1491/* Store, in the inode's containing structure, the block and block 1492 * offset that point to the underlying meta-data for the inode. The 1493 * code below is otherwise similar to the iget() code in 1494 * include/linux/fs.h */ 1495struct inode *__isofs_iget(struct super_block *sb, 1496 unsigned long block, 1497 unsigned long offset, 1498 int relocated) 1499{ 1500 unsigned long hashval; 1501 struct inode *inode; 1502 struct isofs_iget5_callback_data data; 1503 long ret; 1504 1505 if (offset >= 1ul << sb->s_blocksize_bits) 1506 return ERR_PTR(-EINVAL); 1507 1508 data.block = block; 1509 data.offset = offset; 1510 1511 hashval = (block << sb->s_blocksize_bits) | offset; 1512 1513 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1514 &isofs_iget5_set, &data); 1515 1516 if (!inode) 1517 return ERR_PTR(-ENOMEM); 1518 1519 if (inode->i_state & I_NEW) { 1520 ret = isofs_read_inode(inode, relocated); 1521 if (ret < 0) { 1522 iget_failed(inode); 1523 inode = ERR_PTR(ret); 1524 } else { 1525 unlock_new_inode(inode); 1526 } 1527 } 1528 1529 return inode; 1530} 1531 1532static int isofs_get_tree(struct fs_context *fc) 1533{ 1534 return get_tree_bdev(fc, isofs_fill_super); 1535} 1536 1537static void isofs_free_fc(struct fs_context *fc) 1538{ 1539 kfree(fc->fs_private); 1540} 1541 1542static const struct fs_context_operations isofs_context_ops = { 1543 .parse_param = isofs_parse_param, 1544 .get_tree = isofs_get_tree, 1545 .reconfigure = isofs_reconfigure, 1546 .free = isofs_free_fc, 1547}; 1548 1549static int isofs_init_fs_context(struct fs_context *fc) 1550{ 1551 struct isofs_options *opt; 1552 1553 opt = kzalloc(sizeof(*opt), GFP_KERNEL); 1554 if (!opt) 1555 return -ENOMEM; 1556 1557 opt->map = 'n'; 1558 opt->rock = 1; 1559 opt->joliet = 1; 1560 opt->cruft = 0; 1561 opt->hide = 0; 1562 opt->showassoc = 0; 1563 opt->check = 'u'; /* unset */ 1564 opt->nocompress = 0; 1565 opt->blocksize = 1024; 1566 opt->fmode = opt->dmode = ISOFS_INVALID_MODE; 1567 opt->uid_set = 0; 1568 opt->gid_set = 0; 1569 opt->gid = GLOBAL_ROOT_GID; 1570 opt->uid = GLOBAL_ROOT_UID; 1571 opt->iocharset = NULL; 1572 opt->overriderockperm = 0; 1573 opt->session = -1; 1574 opt->sbsector = -1; 1575 1576 fc->fs_private = opt; 1577 fc->ops = &isofs_context_ops; 1578 1579 return 0; 1580} 1581 1582static struct file_system_type iso9660_fs_type = { 1583 .owner = THIS_MODULE, 1584 .name = "iso9660", 1585 .kill_sb = kill_block_super, 1586 .fs_flags = FS_REQUIRES_DEV, 1587 .init_fs_context = isofs_init_fs_context, 1588 .parameters = isofs_param_spec, 1589}; 1590MODULE_ALIAS_FS("iso9660"); 1591MODULE_ALIAS("iso9660"); 1592 1593static int __init init_iso9660_fs(void) 1594{ 1595 int err = init_inodecache(); 1596 if (err) 1597 goto out; 1598#ifdef CONFIG_ZISOFS 1599 err = zisofs_init(); 1600 if (err) 1601 goto out1; 1602#endif 1603 err = register_filesystem(&iso9660_fs_type); 1604 if (err) 1605 goto out2; 1606 return 0; 1607out2: 1608#ifdef CONFIG_ZISOFS 1609 zisofs_cleanup(); 1610out1: 1611#endif 1612 destroy_inodecache(); 1613out: 1614 return err; 1615} 1616 1617static void __exit exit_iso9660_fs(void) 1618{ 1619 unregister_filesystem(&iso9660_fs_type); 1620#ifdef CONFIG_ZISOFS 1621 zisofs_cleanup(); 1622#endif 1623 destroy_inodecache(); 1624} 1625 1626module_init(init_iso9660_fs) 1627module_exit(exit_iso9660_fs) 1628MODULE_LICENSE("GPL"); 1629