linux/fs/isofs/inode.c
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   1/*
   2 *  linux/fs/isofs/inode.c
   3 *
   4 *  (C) 1991  Linus Torvalds - minix filesystem
   5 *      1992, 1993, 1994  Eric Youngdale Modified for ISO 9660 filesystem.
   6 *      1994  Eberhard Mönkeberg - multi session handling.
   7 *      1995  Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
   8 *      1997  Gordon Chaffee - Joliet CDs
   9 *      1998  Eric Lammerts - ISO 9660 Level 3
  10 *      2004  Paul Serice - Inode Support pushed out from 4GB to 128GB
  11 *      2004  Paul Serice - NFS Export Operations
  12 */
  13
  14#include <linux/init.h>
  15#include <linux/module.h>
  16
  17#include <linux/slab.h>
  18#include <linux/nls.h>
  19#include <linux/ctype.h>
  20#include <linux/statfs.h>
  21#include <linux/cdrom.h>
  22#include <linux/parser.h>
  23#include <linux/mpage.h>
  24#include <linux/user_namespace.h>
  25
  26#include "isofs.h"
  27#include "zisofs.h"
  28
  29#define BEQUIET
  30
  31static int isofs_hashi(const struct dentry *parent, const struct inode *inode,
  32                struct qstr *qstr);
  33static int isofs_hash(const struct dentry *parent, const struct inode *inode,
  34                struct qstr *qstr);
  35static int isofs_dentry_cmpi(const struct dentry *parent,
  36                const struct inode *pinode,
  37                const struct dentry *dentry, const struct inode *inode,
  38                unsigned int len, const char *str, const struct qstr *name);
  39static int isofs_dentry_cmp(const struct dentry *parent,
  40                const struct inode *pinode,
  41                const struct dentry *dentry, const struct inode *inode,
  42                unsigned int len, const char *str, const struct qstr *name);
  43
  44#ifdef CONFIG_JOLIET
  45static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode,
  46                struct qstr *qstr);
  47static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode,
  48                struct qstr *qstr);
  49static int isofs_dentry_cmpi_ms(const struct dentry *parent,
  50                const struct inode *pinode,
  51                const struct dentry *dentry, const struct inode *inode,
  52                unsigned int len, const char *str, const struct qstr *name);
  53static int isofs_dentry_cmp_ms(const struct dentry *parent,
  54                const struct inode *pinode,
  55                const struct dentry *dentry, const struct inode *inode,
  56                unsigned int len, const char *str, const struct qstr *name);
  57#endif
  58
  59static void isofs_put_super(struct super_block *sb)
  60{
  61        struct isofs_sb_info *sbi = ISOFS_SB(sb);
  62
  63#ifdef CONFIG_JOLIET
  64        unload_nls(sbi->s_nls_iocharset);
  65#endif
  66
  67        kfree(sbi);
  68        sb->s_fs_info = NULL;
  69        return;
  70}
  71
  72static int isofs_read_inode(struct inode *);
  73static int isofs_statfs (struct dentry *, struct kstatfs *);
  74
  75static struct kmem_cache *isofs_inode_cachep;
  76
  77static struct inode *isofs_alloc_inode(struct super_block *sb)
  78{
  79        struct iso_inode_info *ei;
  80        ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
  81        if (!ei)
  82                return NULL;
  83        return &ei->vfs_inode;
  84}
  85
  86static void isofs_i_callback(struct rcu_head *head)
  87{
  88        struct inode *inode = container_of(head, struct inode, i_rcu);
  89        kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
  90}
  91
  92static void isofs_destroy_inode(struct inode *inode)
  93{
  94        call_rcu(&inode->i_rcu, isofs_i_callback);
  95}
  96
  97static void init_once(void *foo)
  98{
  99        struct iso_inode_info *ei = foo;
 100
 101        inode_init_once(&ei->vfs_inode);
 102}
 103
 104static int init_inodecache(void)
 105{
 106        isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
 107                                        sizeof(struct iso_inode_info),
 108                                        0, (SLAB_RECLAIM_ACCOUNT|
 109                                        SLAB_MEM_SPREAD),
 110                                        init_once);
 111        if (isofs_inode_cachep == NULL)
 112                return -ENOMEM;
 113        return 0;
 114}
 115
 116static void destroy_inodecache(void)
 117{
 118        /*
 119         * Make sure all delayed rcu free inodes are flushed before we
 120         * destroy cache.
 121         */
 122        rcu_barrier();
 123        kmem_cache_destroy(isofs_inode_cachep);
 124}
 125
 126static int isofs_remount(struct super_block *sb, int *flags, char *data)
 127{
 128        /* we probably want a lot more here */
 129        *flags |= MS_RDONLY;
 130        return 0;
 131}
 132
 133static const struct super_operations isofs_sops = {
 134        .alloc_inode    = isofs_alloc_inode,
 135        .destroy_inode  = isofs_destroy_inode,
 136        .put_super      = isofs_put_super,
 137        .statfs         = isofs_statfs,
 138        .remount_fs     = isofs_remount,
 139        .show_options   = generic_show_options,
 140};
 141
 142
 143static const struct dentry_operations isofs_dentry_ops[] = {
 144        {
 145                .d_hash         = isofs_hash,
 146                .d_compare      = isofs_dentry_cmp,
 147        },
 148        {
 149                .d_hash         = isofs_hashi,
 150                .d_compare      = isofs_dentry_cmpi,
 151        },
 152#ifdef CONFIG_JOLIET
 153        {
 154                .d_hash         = isofs_hash_ms,
 155                .d_compare      = isofs_dentry_cmp_ms,
 156        },
 157        {
 158                .d_hash         = isofs_hashi_ms,
 159                .d_compare      = isofs_dentry_cmpi_ms,
 160        },
 161#endif
 162};
 163
 164struct iso9660_options{
 165        unsigned int rock:1;
 166        unsigned int joliet:1;
 167        unsigned int cruft:1;
 168        unsigned int hide:1;
 169        unsigned int showassoc:1;
 170        unsigned int nocompress:1;
 171        unsigned int overriderockperm:1;
 172        unsigned int uid_set:1;
 173        unsigned int gid_set:1;
 174        unsigned int utf8:1;
 175        unsigned char map;
 176        unsigned char check;
 177        unsigned int blocksize;
 178        umode_t fmode;
 179        umode_t dmode;
 180        kgid_t gid;
 181        kuid_t uid;
 182        char *iocharset;
 183        /* LVE */
 184        s32 session;
 185        s32 sbsector;
 186};
 187
 188/*
 189 * Compute the hash for the isofs name corresponding to the dentry.
 190 */
 191static int
 192isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
 193{
 194        const char *name;
 195        int len;
 196
 197        len = qstr->len;
 198        name = qstr->name;
 199        if (ms) {
 200                while (len && name[len-1] == '.')
 201                        len--;
 202        }
 203
 204        qstr->hash = full_name_hash(name, len);
 205
 206        return 0;
 207}
 208
 209/*
 210 * Compute the hash for the isofs name corresponding to the dentry.
 211 */
 212static int
 213isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
 214{
 215        const char *name;
 216        int len;
 217        char c;
 218        unsigned long hash;
 219
 220        len = qstr->len;
 221        name = qstr->name;
 222        if (ms) {
 223                while (len && name[len-1] == '.')
 224                        len--;
 225        }
 226
 227        hash = init_name_hash();
 228        while (len--) {
 229                c = tolower(*name++);
 230                hash = partial_name_hash(c, hash);
 231        }
 232        qstr->hash = end_name_hash(hash);
 233
 234        return 0;
 235}
 236
 237/*
 238 * Compare of two isofs names.
 239 */
 240static int isofs_dentry_cmp_common(
 241                unsigned int len, const char *str,
 242                const struct qstr *name, int ms, int ci)
 243{
 244        int alen, blen;
 245
 246        /* A filename cannot end in '.' or we treat it like it has none */
 247        alen = name->len;
 248        blen = len;
 249        if (ms) {
 250                while (alen && name->name[alen-1] == '.')
 251                        alen--;
 252                while (blen && str[blen-1] == '.')
 253                        blen--;
 254        }
 255        if (alen == blen) {
 256                if (ci) {
 257                        if (strnicmp(name->name, str, alen) == 0)
 258                                return 0;
 259                } else {
 260                        if (strncmp(name->name, str, alen) == 0)
 261                                return 0;
 262                }
 263        }
 264        return 1;
 265}
 266
 267static int
 268isofs_hash(const struct dentry *dentry, const struct inode *inode,
 269                struct qstr *qstr)
 270{
 271        return isofs_hash_common(dentry, qstr, 0);
 272}
 273
 274static int
 275isofs_hashi(const struct dentry *dentry, const struct inode *inode,
 276                struct qstr *qstr)
 277{
 278        return isofs_hashi_common(dentry, qstr, 0);
 279}
 280
 281static int
 282isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode,
 283                const struct dentry *dentry, const struct inode *inode,
 284                unsigned int len, const char *str, const struct qstr *name)
 285{
 286        return isofs_dentry_cmp_common(len, str, name, 0, 0);
 287}
 288
 289static int
 290isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
 291                const struct dentry *dentry, const struct inode *inode,
 292                unsigned int len, const char *str, const struct qstr *name)
 293{
 294        return isofs_dentry_cmp_common(len, str, name, 0, 1);
 295}
 296
 297#ifdef CONFIG_JOLIET
 298static int
 299isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
 300                struct qstr *qstr)
 301{
 302        return isofs_hash_common(dentry, qstr, 1);
 303}
 304
 305static int
 306isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
 307                struct qstr *qstr)
 308{
 309        return isofs_hashi_common(dentry, qstr, 1);
 310}
 311
 312static int
 313isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode,
 314                const struct dentry *dentry, const struct inode *inode,
 315                unsigned int len, const char *str, const struct qstr *name)
 316{
 317        return isofs_dentry_cmp_common(len, str, name, 1, 0);
 318}
 319
 320static int
 321isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode,
 322                const struct dentry *dentry, const struct inode *inode,
 323                unsigned int len, const char *str, const struct qstr *name)
 324{
 325        return isofs_dentry_cmp_common(len, str, name, 1, 1);
 326}
 327#endif
 328
 329enum {
 330        Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
 331        Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
 332        Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
 333        Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
 334};
 335
 336static const match_table_t tokens = {
 337        {Opt_norock, "norock"},
 338        {Opt_nojoliet, "nojoliet"},
 339        {Opt_unhide, "unhide"},
 340        {Opt_hide, "hide"},
 341        {Opt_showassoc, "showassoc"},
 342        {Opt_cruft, "cruft"},
 343        {Opt_utf8, "utf8"},
 344        {Opt_iocharset, "iocharset=%s"},
 345        {Opt_map_a, "map=acorn"},
 346        {Opt_map_a, "map=a"},
 347        {Opt_map_n, "map=normal"},
 348        {Opt_map_n, "map=n"},
 349        {Opt_map_o, "map=off"},
 350        {Opt_map_o, "map=o"},
 351        {Opt_session, "session=%u"},
 352        {Opt_sb, "sbsector=%u"},
 353        {Opt_check_r, "check=relaxed"},
 354        {Opt_check_r, "check=r"},
 355        {Opt_check_s, "check=strict"},
 356        {Opt_check_s, "check=s"},
 357        {Opt_uid, "uid=%u"},
 358        {Opt_gid, "gid=%u"},
 359        {Opt_mode, "mode=%u"},
 360        {Opt_dmode, "dmode=%u"},
 361        {Opt_overriderockperm, "overriderockperm"},
 362        {Opt_block, "block=%u"},
 363        {Opt_ignore, "conv=binary"},
 364        {Opt_ignore, "conv=b"},
 365        {Opt_ignore, "conv=text"},
 366        {Opt_ignore, "conv=t"},
 367        {Opt_ignore, "conv=mtext"},
 368        {Opt_ignore, "conv=m"},
 369        {Opt_ignore, "conv=auto"},
 370        {Opt_ignore, "conv=a"},
 371        {Opt_nocompress, "nocompress"},
 372        {Opt_err, NULL}
 373};
 374
 375static int parse_options(char *options, struct iso9660_options *popt)
 376{
 377        char *p;
 378        int option;
 379
 380        popt->map = 'n';
 381        popt->rock = 1;
 382        popt->joliet = 1;
 383        popt->cruft = 0;
 384        popt->hide = 0;
 385        popt->showassoc = 0;
 386        popt->check = 'u';              /* unset */
 387        popt->nocompress = 0;
 388        popt->blocksize = 1024;
 389        popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
 390        popt->uid_set = 0;
 391        popt->gid_set = 0;
 392        popt->gid = GLOBAL_ROOT_GID;
 393        popt->uid = GLOBAL_ROOT_UID;
 394        popt->iocharset = NULL;
 395        popt->utf8 = 0;
 396        popt->overriderockperm = 0;
 397        popt->session=-1;
 398        popt->sbsector=-1;
 399        if (!options)
 400                return 1;
 401
 402        while ((p = strsep(&options, ",")) != NULL) {
 403                int token;
 404                substring_t args[MAX_OPT_ARGS];
 405                unsigned n;
 406
 407                if (!*p)
 408                        continue;
 409
 410                token = match_token(p, tokens, args);
 411                switch (token) {
 412                case Opt_norock:
 413                        popt->rock = 0;
 414                        break;
 415                case Opt_nojoliet:
 416                        popt->joliet = 0;
 417                        break;
 418                case Opt_hide:
 419                        popt->hide = 1;
 420                        break;
 421                case Opt_unhide:
 422                case Opt_showassoc:
 423                        popt->showassoc = 1;
 424                        break;
 425                case Opt_cruft:
 426                        popt->cruft = 1;
 427                        break;
 428                case Opt_utf8:
 429                        popt->utf8 = 1;
 430                        break;
 431#ifdef CONFIG_JOLIET
 432                case Opt_iocharset:
 433                        popt->iocharset = match_strdup(&args[0]);
 434                        break;
 435#endif
 436                case Opt_map_a:
 437                        popt->map = 'a';
 438                        break;
 439                case Opt_map_o:
 440                        popt->map = 'o';
 441                        break;
 442                case Opt_map_n:
 443                        popt->map = 'n';
 444                        break;
 445                case Opt_session:
 446                        if (match_int(&args[0], &option))
 447                                return 0;
 448                        n = option;
 449                        if (n > 99)
 450                                return 0;
 451                        popt->session = n + 1;
 452                        break;
 453                case Opt_sb:
 454                        if (match_int(&args[0], &option))
 455                                return 0;
 456                        popt->sbsector = option;
 457                        break;
 458                case Opt_check_r:
 459                        popt->check = 'r';
 460                        break;
 461                case Opt_check_s:
 462                        popt->check = 's';
 463                        break;
 464                case Opt_ignore:
 465                        break;
 466                case Opt_uid:
 467                        if (match_int(&args[0], &option))
 468                                return 0;
 469                        popt->uid = make_kuid(current_user_ns(), option);
 470                        if (!uid_valid(popt->uid))
 471                                return 0;
 472                        popt->uid_set = 1;
 473                        break;
 474                case Opt_gid:
 475                        if (match_int(&args[0], &option))
 476                                return 0;
 477                        popt->gid = make_kgid(current_user_ns(), option);
 478                        if (!gid_valid(popt->gid))
 479                                return 0;
 480                        popt->gid_set = 1;
 481                        break;
 482                case Opt_mode:
 483                        if (match_int(&args[0], &option))
 484                                return 0;
 485                        popt->fmode = option;
 486                        break;
 487                case Opt_dmode:
 488                        if (match_int(&args[0], &option))
 489                                return 0;
 490                        popt->dmode = option;
 491                        break;
 492                case Opt_overriderockperm:
 493                        popt->overriderockperm = 1;
 494                        break;
 495                case Opt_block:
 496                        if (match_int(&args[0], &option))
 497                                return 0;
 498                        n = option;
 499                        if (n != 512 && n != 1024 && n != 2048)
 500                                return 0;
 501                        popt->blocksize = n;
 502                        break;
 503                case Opt_nocompress:
 504                        popt->nocompress = 1;
 505                        break;
 506                default:
 507                        return 0;
 508                }
 509        }
 510        return 1;
 511}
 512
 513/*
 514 * look if the driver can tell the multi session redirection value
 515 *
 516 * don't change this if you don't know what you do, please!
 517 * Multisession is legal only with XA disks.
 518 * A non-XA disk with more than one volume descriptor may do it right, but
 519 * usually is written in a nowhere standardized "multi-partition" manner.
 520 * Multisession uses absolute addressing (solely the first frame of the whole
 521 * track is #0), multi-partition uses relative addressing (each first frame of
 522 * each track is #0), and a track is not a session.
 523 *
 524 * A broken CDwriter software or drive firmware does not set new standards,
 525 * at least not if conflicting with the existing ones.
 526 *
 527 * emoenke@gwdg.de
 528 */
 529#define WE_OBEY_THE_WRITTEN_STANDARDS 1
 530
 531static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
 532{
 533        struct cdrom_multisession ms_info;
 534        unsigned int vol_desc_start;
 535        struct block_device *bdev = sb->s_bdev;
 536        int i;
 537
 538        vol_desc_start=0;
 539        ms_info.addr_format=CDROM_LBA;
 540        if(session >= 0 && session <= 99) {
 541                struct cdrom_tocentry Te;
 542                Te.cdte_track=session;
 543                Te.cdte_format=CDROM_LBA;
 544                i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
 545                if (!i) {
 546                        printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
 547                                session, Te.cdte_addr.lba,
 548                                Te.cdte_ctrl&CDROM_DATA_TRACK);
 549                        if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
 550                                return Te.cdte_addr.lba;
 551                }
 552
 553                printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
 554        }
 555        i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
 556        if (session > 0)
 557                printk(KERN_ERR "ISOFS: Invalid session number\n");
 558#if 0
 559        printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
 560        if (i==0) {
 561                printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
 562                printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
 563        }
 564#endif
 565        if (i==0)
 566#if WE_OBEY_THE_WRITTEN_STANDARDS
 567                if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
 568#endif
 569                        vol_desc_start=ms_info.addr.lba;
 570        return vol_desc_start;
 571}
 572
 573/*
 574 * Check if root directory is empty (has less than 3 files).
 575 *
 576 * Used to detect broken CDs where ISO root directory is empty but Joliet root
 577 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
 578 * (and Joliet used instead) or else no files would be visible.
 579 */
 580static bool rootdir_empty(struct super_block *sb, unsigned long block)
 581{
 582        int offset = 0, files = 0, de_len;
 583        struct iso_directory_record *de;
 584        struct buffer_head *bh;
 585
 586        bh = sb_bread(sb, block);
 587        if (!bh)
 588                return true;
 589        while (files < 3) {
 590                de = (struct iso_directory_record *) (bh->b_data + offset);
 591                de_len = *(unsigned char *) de;
 592                if (de_len == 0)
 593                        break;
 594                files++;
 595                offset += de_len;
 596        }
 597        brelse(bh);
 598        return files < 3;
 599}
 600
 601/*
 602 * Initialize the superblock and read the root inode.
 603 *
 604 * Note: a check_disk_change() has been done immediately prior
 605 * to this call, so we don't need to check again.
 606 */
 607static int isofs_fill_super(struct super_block *s, void *data, int silent)
 608{
 609        struct buffer_head *bh = NULL, *pri_bh = NULL;
 610        struct hs_primary_descriptor *h_pri = NULL;
 611        struct iso_primary_descriptor *pri = NULL;
 612        struct iso_supplementary_descriptor *sec = NULL;
 613        struct iso_directory_record *rootp;
 614        struct inode *inode;
 615        struct iso9660_options opt;
 616        struct isofs_sb_info *sbi;
 617        unsigned long first_data_zone;
 618        int joliet_level = 0;
 619        int iso_blknum, block;
 620        int orig_zonesize;
 621        int table, error = -EINVAL;
 622        unsigned int vol_desc_start;
 623
 624        save_mount_options(s, data);
 625
 626        sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 627        if (!sbi)
 628                return -ENOMEM;
 629        s->s_fs_info = sbi;
 630
 631        if (!parse_options((char *)data, &opt))
 632                goto out_freesbi;
 633
 634        /*
 635         * First of all, get the hardware blocksize for this device.
 636         * If we don't know what it is, or the hardware blocksize is
 637         * larger than the blocksize the user specified, then use
 638         * that value.
 639         */
 640        /*
 641         * What if bugger tells us to go beyond page size?
 642         */
 643        opt.blocksize = sb_min_blocksize(s, opt.blocksize);
 644
 645        sbi->s_high_sierra = 0; /* default is iso9660 */
 646
 647        vol_desc_start = (opt.sbsector != -1) ?
 648                opt.sbsector : isofs_get_last_session(s,opt.session);
 649
 650        for (iso_blknum = vol_desc_start+16;
 651                iso_blknum < vol_desc_start+100; iso_blknum++) {
 652                struct hs_volume_descriptor *hdp;
 653                struct iso_volume_descriptor  *vdp;
 654
 655                block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
 656                if (!(bh = sb_bread(s, block)))
 657                        goto out_no_read;
 658
 659                vdp = (struct iso_volume_descriptor *)bh->b_data;
 660                hdp = (struct hs_volume_descriptor *)bh->b_data;
 661
 662                /*
 663                 * Due to the overlapping physical location of the descriptors,
 664                 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
 665                 * proper identification in this case, we first check for ISO.
 666                 */
 667                if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
 668                        if (isonum_711(vdp->type) == ISO_VD_END)
 669                                break;
 670                        if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
 671                                if (pri == NULL) {
 672                                        pri = (struct iso_primary_descriptor *)vdp;
 673                                        /* Save the buffer in case we need it ... */
 674                                        pri_bh = bh;
 675                                        bh = NULL;
 676                                }
 677                        }
 678#ifdef CONFIG_JOLIET
 679                        else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
 680                                sec = (struct iso_supplementary_descriptor *)vdp;
 681                                if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
 682                                        if (opt.joliet) {
 683                                                if (sec->escape[2] == 0x40)
 684                                                        joliet_level = 1;
 685                                                else if (sec->escape[2] == 0x43)
 686                                                        joliet_level = 2;
 687                                                else if (sec->escape[2] == 0x45)
 688                                                        joliet_level = 3;
 689
 690                                                printk(KERN_DEBUG "ISO 9660 Extensions: "
 691                                                        "Microsoft Joliet Level %d\n",
 692                                                        joliet_level);
 693                                        }
 694                                        goto root_found;
 695                                } else {
 696                                /* Unknown supplementary volume descriptor */
 697                                sec = NULL;
 698                                }
 699                        }
 700#endif
 701                } else {
 702                        if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
 703                                if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
 704                                        goto out_freebh;
 705
 706                                sbi->s_high_sierra = 1;
 707                                opt.rock = 0;
 708                                h_pri = (struct hs_primary_descriptor *)vdp;
 709                                goto root_found;
 710                        }
 711                }
 712
 713                /* Just skip any volume descriptors we don't recognize */
 714
 715                brelse(bh);
 716                bh = NULL;
 717        }
 718        /*
 719         * If we fall through, either no volume descriptor was found,
 720         * or else we passed a primary descriptor looking for others.
 721         */
 722        if (!pri)
 723                goto out_unknown_format;
 724        brelse(bh);
 725        bh = pri_bh;
 726        pri_bh = NULL;
 727
 728root_found:
 729
 730        if (joliet_level && (pri == NULL || !opt.rock)) {
 731                /* This is the case of Joliet with the norock mount flag.
 732                 * A disc with both Joliet and Rock Ridge is handled later
 733                 */
 734                pri = (struct iso_primary_descriptor *) sec;
 735        }
 736
 737        if(sbi->s_high_sierra){
 738                rootp = (struct iso_directory_record *) h_pri->root_directory_record;
 739                sbi->s_nzones = isonum_733(h_pri->volume_space_size);
 740                sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
 741                sbi->s_max_size = isonum_733(h_pri->volume_space_size);
 742        } else {
 743                if (!pri)
 744                        goto out_freebh;
 745                rootp = (struct iso_directory_record *) pri->root_directory_record;
 746                sbi->s_nzones = isonum_733(pri->volume_space_size);
 747                sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
 748                sbi->s_max_size = isonum_733(pri->volume_space_size);
 749        }
 750
 751        sbi->s_ninodes = 0; /* No way to figure this out easily */
 752
 753        orig_zonesize = sbi->s_log_zone_size;
 754        /*
 755         * If the zone size is smaller than the hardware sector size,
 756         * this is a fatal error.  This would occur if the disc drive
 757         * had sectors that were 2048 bytes, but the filesystem had
 758         * blocks that were 512 bytes (which should only very rarely
 759         * happen.)
 760         */
 761        if (orig_zonesize < opt.blocksize)
 762                goto out_bad_size;
 763
 764        /* RDE: convert log zone size to bit shift */
 765        switch (sbi->s_log_zone_size) {
 766        case  512: sbi->s_log_zone_size =  9; break;
 767        case 1024: sbi->s_log_zone_size = 10; break;
 768        case 2048: sbi->s_log_zone_size = 11; break;
 769
 770        default:
 771                goto out_bad_zone_size;
 772        }
 773
 774        s->s_magic = ISOFS_SUPER_MAGIC;
 775
 776        /*
 777         * With multi-extent files, file size is only limited by the maximum
 778         * size of a file system, which is 8 TB.
 779         */
 780        s->s_maxbytes = 0x80000000000LL;
 781
 782        /*
 783         * The CDROM is read-only, has no nodes (devices) on it, and since
 784         * all of the files appear to be owned by root, we really do not want
 785         * to allow suid.  (suid or devices will not show up unless we have
 786         * Rock Ridge extensions)
 787         */
 788
 789        s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
 790
 791        /* Set this for reference. Its not currently used except on write
 792           which we don't have .. */
 793
 794        first_data_zone = isonum_733(rootp->extent) +
 795                          isonum_711(rootp->ext_attr_length);
 796        sbi->s_firstdatazone = first_data_zone;
 797#ifndef BEQUIET
 798        printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
 799                sbi->s_max_size, 1UL << sbi->s_log_zone_size);
 800        printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
 801        if(sbi->s_high_sierra)
 802                printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
 803#endif
 804
 805        /*
 806         * If the Joliet level is set, we _may_ decide to use the
 807         * secondary descriptor, but can't be sure until after we
 808         * read the root inode. But before reading the root inode
 809         * we may need to change the device blocksize, and would
 810         * rather release the old buffer first. So, we cache the
 811         * first_data_zone value from the secondary descriptor.
 812         */
 813        if (joliet_level) {
 814                pri = (struct iso_primary_descriptor *) sec;
 815                rootp = (struct iso_directory_record *)
 816                        pri->root_directory_record;
 817                first_data_zone = isonum_733(rootp->extent) +
 818                                isonum_711(rootp->ext_attr_length);
 819        }
 820
 821        /*
 822         * We're all done using the volume descriptor, and may need
 823         * to change the device blocksize, so release the buffer now.
 824         */
 825        brelse(pri_bh);
 826        brelse(bh);
 827
 828        /*
 829         * Force the blocksize to 512 for 512 byte sectors.  The file
 830         * read primitives really get it wrong in a bad way if we don't
 831         * do this.
 832         *
 833         * Note - we should never be setting the blocksize to something
 834         * less than the hardware sector size for the device.  If we
 835         * do, we would end up having to read larger buffers and split
 836         * out portions to satisfy requests.
 837         *
 838         * Note2- the idea here is that we want to deal with the optimal
 839         * zonesize in the filesystem.  If we have it set to something less,
 840         * then we have horrible problems with trying to piece together
 841         * bits of adjacent blocks in order to properly read directory
 842         * entries.  By forcing the blocksize in this way, we ensure
 843         * that we will never be required to do this.
 844         */
 845        sb_set_blocksize(s, orig_zonesize);
 846
 847        sbi->s_nls_iocharset = NULL;
 848
 849#ifdef CONFIG_JOLIET
 850        if (joliet_level && opt.utf8 == 0) {
 851                char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
 852                sbi->s_nls_iocharset = load_nls(p);
 853                if (! sbi->s_nls_iocharset) {
 854                        /* Fail only if explicit charset specified */
 855                        if (opt.iocharset)
 856                                goto out_freesbi;
 857                        sbi->s_nls_iocharset = load_nls_default();
 858                }
 859        }
 860#endif
 861        s->s_op = &isofs_sops;
 862        s->s_export_op = &isofs_export_ops;
 863        sbi->s_mapping = opt.map;
 864        sbi->s_rock = (opt.rock ? 2 : 0);
 865        sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
 866        sbi->s_cruft = opt.cruft;
 867        sbi->s_hide = opt.hide;
 868        sbi->s_showassoc = opt.showassoc;
 869        sbi->s_uid = opt.uid;
 870        sbi->s_gid = opt.gid;
 871        sbi->s_uid_set = opt.uid_set;
 872        sbi->s_gid_set = opt.gid_set;
 873        sbi->s_utf8 = opt.utf8;
 874        sbi->s_nocompress = opt.nocompress;
 875        sbi->s_overriderockperm = opt.overriderockperm;
 876        /*
 877         * It would be incredibly stupid to allow people to mark every file
 878         * on the disk as suid, so we merely allow them to set the default
 879         * permissions.
 880         */
 881        if (opt.fmode != ISOFS_INVALID_MODE)
 882                sbi->s_fmode = opt.fmode & 0777;
 883        else
 884                sbi->s_fmode = ISOFS_INVALID_MODE;
 885        if (opt.dmode != ISOFS_INVALID_MODE)
 886                sbi->s_dmode = opt.dmode & 0777;
 887        else
 888                sbi->s_dmode = ISOFS_INVALID_MODE;
 889
 890        /*
 891         * Read the root inode, which _may_ result in changing
 892         * the s_rock flag. Once we have the final s_rock value,
 893         * we then decide whether to use the Joliet descriptor.
 894         */
 895        inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 896        if (IS_ERR(inode))
 897                goto out_no_root;
 898
 899        /*
 900         * Fix for broken CDs with Rock Ridge and empty ISO root directory but
 901         * correct Joliet root directory.
 902         */
 903        if (sbi->s_rock == 1 && joliet_level &&
 904                                rootdir_empty(s, sbi->s_firstdatazone)) {
 905                printk(KERN_NOTICE
 906                        "ISOFS: primary root directory is empty. "
 907                        "Disabling Rock Ridge and switching to Joliet.");
 908                sbi->s_rock = 0;
 909        }
 910
 911        /*
 912         * If this disk has both Rock Ridge and Joliet on it, then we
 913         * want to use Rock Ridge by default.  This can be overridden
 914         * by using the norock mount option.  There is still one other
 915         * possibility that is not taken into account: a Rock Ridge
 916         * CD with Unicode names.  Until someone sees such a beast, it
 917         * will not be supported.
 918         */
 919        if (sbi->s_rock == 1) {
 920                joliet_level = 0;
 921        } else if (joliet_level) {
 922                sbi->s_rock = 0;
 923                if (sbi->s_firstdatazone != first_data_zone) {
 924                        sbi->s_firstdatazone = first_data_zone;
 925                        printk(KERN_DEBUG
 926                                "ISOFS: changing to secondary root\n");
 927                        iput(inode);
 928                        inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 929                        if (IS_ERR(inode))
 930                                goto out_no_root;
 931                }
 932        }
 933
 934        if (opt.check == 'u') {
 935                /* Only Joliet is case insensitive by default */
 936                if (joliet_level)
 937                        opt.check = 'r';
 938                else
 939                        opt.check = 's';
 940        }
 941        sbi->s_joliet_level = joliet_level;
 942
 943        /* Make sure the root inode is a directory */
 944        if (!S_ISDIR(inode->i_mode)) {
 945                printk(KERN_WARNING
 946                        "isofs_fill_super: root inode is not a directory. "
 947                        "Corrupted media?\n");
 948                goto out_iput;
 949        }
 950
 951        table = 0;
 952        if (joliet_level)
 953                table += 2;
 954        if (opt.check == 'r')
 955                table++;
 956
 957        s->s_d_op = &isofs_dentry_ops[table];
 958
 959        /* get the root dentry */
 960        s->s_root = d_make_root(inode);
 961        if (!(s->s_root)) {
 962                error = -ENOMEM;
 963                goto out_no_inode;
 964        }
 965
 966        kfree(opt.iocharset);
 967
 968        return 0;
 969
 970        /*
 971         * Display error messages and free resources.
 972         */
 973out_iput:
 974        iput(inode);
 975        goto out_no_inode;
 976out_no_root:
 977        error = PTR_ERR(inode);
 978        if (error != -ENOMEM)
 979                printk(KERN_WARNING "%s: get root inode failed\n", __func__);
 980out_no_inode:
 981#ifdef CONFIG_JOLIET
 982        unload_nls(sbi->s_nls_iocharset);
 983#endif
 984        goto out_freesbi;
 985out_no_read:
 986        printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
 987                __func__, s->s_id, iso_blknum, block);
 988        goto out_freebh;
 989out_bad_zone_size:
 990        printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
 991                sbi->s_log_zone_size);
 992        goto out_freebh;
 993out_bad_size:
 994        printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
 995                orig_zonesize, opt.blocksize);
 996        goto out_freebh;
 997out_unknown_format:
 998        if (!silent)
 999                printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1000
1001out_freebh:
1002        brelse(bh);
1003        brelse(pri_bh);
1004out_freesbi:
1005        kfree(opt.iocharset);
1006        kfree(sbi);
1007        s->s_fs_info = NULL;
1008        return error;
1009}
1010
1011static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1012{
1013        struct super_block *sb = dentry->d_sb;
1014        u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1015
1016        buf->f_type = ISOFS_SUPER_MAGIC;
1017        buf->f_bsize = sb->s_blocksize;
1018        buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1019                << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1020        buf->f_bfree = 0;
1021        buf->f_bavail = 0;
1022        buf->f_files = ISOFS_SB(sb)->s_ninodes;
1023        buf->f_ffree = 0;
1024        buf->f_fsid.val[0] = (u32)id;
1025        buf->f_fsid.val[1] = (u32)(id >> 32);
1026        buf->f_namelen = NAME_MAX;
1027        return 0;
1028}
1029
1030/*
1031 * Get a set of blocks; filling in buffer_heads if already allocated
1032 * or getblk() if they are not.  Returns the number of blocks inserted
1033 * (-ve == error.)
1034 */
1035int isofs_get_blocks(struct inode *inode, sector_t iblock,
1036                     struct buffer_head **bh, unsigned long nblocks)
1037{
1038        unsigned long b_off = iblock;
1039        unsigned offset, sect_size;
1040        unsigned int firstext;
1041        unsigned long nextblk, nextoff;
1042        int section, rv, error;
1043        struct iso_inode_info *ei = ISOFS_I(inode);
1044
1045        error = -EIO;
1046        rv = 0;
1047        if (iblock != b_off) {
1048                printk(KERN_DEBUG "%s: block number too large\n", __func__);
1049                goto abort;
1050        }
1051
1052
1053        offset = 0;
1054        firstext = ei->i_first_extent;
1055        sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1056        nextblk = ei->i_next_section_block;
1057        nextoff = ei->i_next_section_offset;
1058        section = 0;
1059
1060        while (nblocks) {
1061                /* If we are *way* beyond the end of the file, print a message.
1062                 * Access beyond the end of the file up to the next page boundary
1063                 * is normal, however because of the way the page cache works.
1064                 * In this case, we just return 0 so that we can properly fill
1065                 * the page with useless information without generating any
1066                 * I/O errors.
1067                 */
1068                if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1069                        printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1070                                __func__, b_off,
1071                                (unsigned long long)inode->i_size);
1072                        goto abort;
1073                }
1074
1075                /* On the last section, nextblk == 0, section size is likely to
1076                 * exceed sect_size by a partial block, and access beyond the
1077                 * end of the file will reach beyond the section size, too.
1078                 */
1079                while (nextblk && (b_off >= (offset + sect_size))) {
1080                        struct inode *ninode;
1081
1082                        offset += sect_size;
1083                        ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1084                        if (IS_ERR(ninode)) {
1085                                error = PTR_ERR(ninode);
1086                                goto abort;
1087                        }
1088                        firstext  = ISOFS_I(ninode)->i_first_extent;
1089                        sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1090                        nextblk   = ISOFS_I(ninode)->i_next_section_block;
1091                        nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1092                        iput(ninode);
1093
1094                        if (++section > 100) {
1095                                printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1096                                        " aborting...\n", __func__);
1097                                printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1098                                        "nextblk=%lu nextoff=%lu\n", __func__,
1099                                        b_off, firstext, (unsigned) sect_size,
1100                                        nextblk, nextoff);
1101                                goto abort;
1102                        }
1103                }
1104
1105                if (*bh) {
1106                        map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1107                } else {
1108                        *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1109                        if (!*bh)
1110                                goto abort;
1111                }
1112                bh++;   /* Next buffer head */
1113                b_off++;        /* Next buffer offset */
1114                nblocks--;
1115                rv++;
1116        }
1117
1118        error = 0;
1119abort:
1120        return rv != 0 ? rv : error;
1121}
1122
1123/*
1124 * Used by the standard interfaces.
1125 */
1126static int isofs_get_block(struct inode *inode, sector_t iblock,
1127                    struct buffer_head *bh_result, int create)
1128{
1129        int ret;
1130
1131        if (create) {
1132                printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1133                return -EROFS;
1134        }
1135
1136        ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1137        return ret < 0 ? ret : 0;
1138}
1139
1140static int isofs_bmap(struct inode *inode, sector_t block)
1141{
1142        struct buffer_head dummy;
1143        int error;
1144
1145        dummy.b_state = 0;
1146        dummy.b_blocknr = -1000;
1147        error = isofs_get_block(inode, block, &dummy, 0);
1148        if (!error)
1149                return dummy.b_blocknr;
1150        return 0;
1151}
1152
1153struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1154{
1155        sector_t blknr = isofs_bmap(inode, block);
1156        if (!blknr)
1157                return NULL;
1158        return sb_bread(inode->i_sb, blknr);
1159}
1160
1161static int isofs_readpage(struct file *file, struct page *page)
1162{
1163        return mpage_readpage(page, isofs_get_block);
1164}
1165
1166static int isofs_readpages(struct file *file, struct address_space *mapping,
1167                        struct list_head *pages, unsigned nr_pages)
1168{
1169        return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1170}
1171
1172static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1173{
1174        return generic_block_bmap(mapping,block,isofs_get_block);
1175}
1176
1177static const struct address_space_operations isofs_aops = {
1178        .readpage = isofs_readpage,
1179        .readpages = isofs_readpages,
1180        .bmap = _isofs_bmap
1181};
1182
1183static int isofs_read_level3_size(struct inode *inode)
1184{
1185        unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1186        int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1187        struct buffer_head *bh = NULL;
1188        unsigned long block, offset, block_saved, offset_saved;
1189        int i = 0;
1190        int more_entries = 0;
1191        struct iso_directory_record *tmpde = NULL;
1192        struct iso_inode_info *ei = ISOFS_I(inode);
1193
1194        inode->i_size = 0;
1195
1196        /* The first 16 blocks are reserved as the System Area.  Thus,
1197         * no inodes can appear in block 0.  We use this to flag that
1198         * this is the last section. */
1199        ei->i_next_section_block = 0;
1200        ei->i_next_section_offset = 0;
1201
1202        block = ei->i_iget5_block;
1203        offset = ei->i_iget5_offset;
1204
1205        do {
1206                struct iso_directory_record *de;
1207                unsigned int de_len;
1208
1209                if (!bh) {
1210                        bh = sb_bread(inode->i_sb, block);
1211                        if (!bh)
1212                                goto out_noread;
1213                }
1214                de = (struct iso_directory_record *) (bh->b_data + offset);
1215                de_len = *(unsigned char *) de;
1216
1217                if (de_len == 0) {
1218                        brelse(bh);
1219                        bh = NULL;
1220                        ++block;
1221                        offset = 0;
1222                        continue;
1223                }
1224
1225                block_saved = block;
1226                offset_saved = offset;
1227                offset += de_len;
1228
1229                /* Make sure we have a full directory entry */
1230                if (offset >= bufsize) {
1231                        int slop = bufsize - offset + de_len;
1232                        if (!tmpde) {
1233                                tmpde = kmalloc(256, GFP_KERNEL);
1234                                if (!tmpde)
1235                                        goto out_nomem;
1236                        }
1237                        memcpy(tmpde, de, slop);
1238                        offset &= bufsize - 1;
1239                        block++;
1240                        brelse(bh);
1241                        bh = NULL;
1242                        if (offset) {
1243                                bh = sb_bread(inode->i_sb, block);
1244                                if (!bh)
1245                                        goto out_noread;
1246                                memcpy((void *)tmpde+slop, bh->b_data, offset);
1247                        }
1248                        de = tmpde;
1249                }
1250
1251                inode->i_size += isonum_733(de->size);
1252                if (i == 1) {
1253                        ei->i_next_section_block = block_saved;
1254                        ei->i_next_section_offset = offset_saved;
1255                }
1256
1257                more_entries = de->flags[-high_sierra] & 0x80;
1258
1259                i++;
1260                if (i > 100)
1261                        goto out_toomany;
1262        } while (more_entries);
1263out:
1264        kfree(tmpde);
1265        if (bh)
1266                brelse(bh);
1267        return 0;
1268
1269out_nomem:
1270        if (bh)
1271                brelse(bh);
1272        return -ENOMEM;
1273
1274out_noread:
1275        printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1276        kfree(tmpde);
1277        return -EIO;
1278
1279out_toomany:
1280        printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1281                "isofs_read_level3_size: inode=%lu\n",
1282                __func__, inode->i_ino);
1283        goto out;
1284}
1285
1286static int isofs_read_inode(struct inode *inode)
1287{
1288        struct super_block *sb = inode->i_sb;
1289        struct isofs_sb_info *sbi = ISOFS_SB(sb);
1290        unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1291        unsigned long block;
1292        int high_sierra = sbi->s_high_sierra;
1293        struct buffer_head *bh = NULL;
1294        struct iso_directory_record *de;
1295        struct iso_directory_record *tmpde = NULL;
1296        unsigned int de_len;
1297        unsigned long offset;
1298        struct iso_inode_info *ei = ISOFS_I(inode);
1299        int ret = -EIO;
1300
1301        block = ei->i_iget5_block;
1302        bh = sb_bread(inode->i_sb, block);
1303        if (!bh)
1304                goto out_badread;
1305
1306        offset = ei->i_iget5_offset;
1307
1308        de = (struct iso_directory_record *) (bh->b_data + offset);
1309        de_len = *(unsigned char *) de;
1310
1311        if (offset + de_len > bufsize) {
1312                int frag1 = bufsize - offset;
1313
1314                tmpde = kmalloc(de_len, GFP_KERNEL);
1315                if (tmpde == NULL) {
1316                        printk(KERN_INFO "%s: out of memory\n", __func__);
1317                        ret = -ENOMEM;
1318                        goto fail;
1319                }
1320                memcpy(tmpde, bh->b_data + offset, frag1);
1321                brelse(bh);
1322                bh = sb_bread(inode->i_sb, ++block);
1323                if (!bh)
1324                        goto out_badread;
1325                memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1326                de = tmpde;
1327        }
1328
1329        inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1330                                        ei->i_iget5_offset,
1331                                        ISOFS_BUFFER_BITS(inode));
1332
1333        /* Assume it is a normal-format file unless told otherwise */
1334        ei->i_file_format = isofs_file_normal;
1335
1336        if (de->flags[-high_sierra] & 2) {
1337                if (sbi->s_dmode != ISOFS_INVALID_MODE)
1338                        inode->i_mode = S_IFDIR | sbi->s_dmode;
1339                else
1340                        inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1341                set_nlink(inode, 1);    /*
1342                                         * Set to 1.  We know there are 2, but
1343                                         * the find utility tries to optimize
1344                                         * if it is 2, and it screws up.  It is
1345                                         * easier to give 1 which tells find to
1346                                         * do it the hard way.
1347                                         */
1348        } else {
1349                if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1350                        inode->i_mode = S_IFREG | sbi->s_fmode;
1351                } else {
1352                        /*
1353                         * Set default permissions: r-x for all.  The disc
1354                         * could be shared with DOS machines so virtually
1355                         * anything could be a valid executable.
1356                         */
1357                        inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1358                }
1359                set_nlink(inode, 1);
1360        }
1361        inode->i_uid = sbi->s_uid;
1362        inode->i_gid = sbi->s_gid;
1363        inode->i_blocks = 0;
1364
1365        ei->i_format_parm[0] = 0;
1366        ei->i_format_parm[1] = 0;
1367        ei->i_format_parm[2] = 0;
1368
1369        ei->i_section_size = isonum_733(de->size);
1370        if (de->flags[-high_sierra] & 0x80) {
1371                ret = isofs_read_level3_size(inode);
1372                if (ret < 0)
1373                        goto fail;
1374                ret = -EIO;
1375        } else {
1376                ei->i_next_section_block = 0;
1377                ei->i_next_section_offset = 0;
1378                inode->i_size = isonum_733(de->size);
1379        }
1380
1381        /*
1382         * Some dipshit decided to store some other bit of information
1383         * in the high byte of the file length.  Truncate size in case
1384         * this CDROM was mounted with the cruft option.
1385         */
1386
1387        if (sbi->s_cruft)
1388                inode->i_size &= 0x00ffffff;
1389
1390        if (de->interleave[0]) {
1391                printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1392                inode->i_size = 0;
1393        }
1394
1395        /* I have no idea what file_unit_size is used for, so
1396           we will flag it for now */
1397        if (de->file_unit_size[0] != 0) {
1398                printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1399                        inode->i_ino);
1400        }
1401
1402        /* I have no idea what other flag bits are used for, so
1403           we will flag it for now */
1404#ifdef DEBUG
1405        if((de->flags[-high_sierra] & ~2)!= 0){
1406                printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1407                                "(%ld %x).\n",
1408                        inode->i_ino, de->flags[-high_sierra]);
1409        }
1410#endif
1411
1412        inode->i_mtime.tv_sec =
1413        inode->i_atime.tv_sec =
1414        inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1415        inode->i_mtime.tv_nsec =
1416        inode->i_atime.tv_nsec =
1417        inode->i_ctime.tv_nsec = 0;
1418
1419        ei->i_first_extent = (isonum_733(de->extent) +
1420                        isonum_711(de->ext_attr_length));
1421
1422        /* Set the number of blocks for stat() - should be done before RR */
1423        inode->i_blocks = (inode->i_size + 511) >> 9;
1424
1425        /*
1426         * Now test for possible Rock Ridge extensions which will override
1427         * some of these numbers in the inode structure.
1428         */
1429
1430        if (!high_sierra) {
1431                parse_rock_ridge_inode(de, inode);
1432                /* if we want uid/gid set, override the rock ridge setting */
1433                if (sbi->s_uid_set)
1434                        inode->i_uid = sbi->s_uid;
1435                if (sbi->s_gid_set)
1436                        inode->i_gid = sbi->s_gid;
1437        }
1438        /* Now set final access rights if overriding rock ridge setting */
1439        if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1440            sbi->s_dmode != ISOFS_INVALID_MODE)
1441                inode->i_mode = S_IFDIR | sbi->s_dmode;
1442        if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1443            sbi->s_fmode != ISOFS_INVALID_MODE)
1444                inode->i_mode = S_IFREG | sbi->s_fmode;
1445
1446        /* Install the inode operations vector */
1447        if (S_ISREG(inode->i_mode)) {
1448                inode->i_fop = &generic_ro_fops;
1449                switch (ei->i_file_format) {
1450#ifdef CONFIG_ZISOFS
1451                case isofs_file_compressed:
1452                        inode->i_data.a_ops = &zisofs_aops;
1453                        break;
1454#endif
1455                default:
1456                        inode->i_data.a_ops = &isofs_aops;
1457                        break;
1458                }
1459        } else if (S_ISDIR(inode->i_mode)) {
1460                inode->i_op = &isofs_dir_inode_operations;
1461                inode->i_fop = &isofs_dir_operations;
1462        } else if (S_ISLNK(inode->i_mode)) {
1463                inode->i_op = &page_symlink_inode_operations;
1464                inode->i_data.a_ops = &isofs_symlink_aops;
1465        } else
1466                /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1467                init_special_inode(inode, inode->i_mode, inode->i_rdev);
1468
1469        ret = 0;
1470out:
1471        kfree(tmpde);
1472        if (bh)
1473                brelse(bh);
1474        return ret;
1475
1476out_badread:
1477        printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1478fail:
1479        goto out;
1480}
1481
1482struct isofs_iget5_callback_data {
1483        unsigned long block;
1484        unsigned long offset;
1485};
1486
1487static int isofs_iget5_test(struct inode *ino, void *data)
1488{
1489        struct iso_inode_info *i = ISOFS_I(ino);
1490        struct isofs_iget5_callback_data *d =
1491                (struct isofs_iget5_callback_data*)data;
1492        return (i->i_iget5_block == d->block)
1493                && (i->i_iget5_offset == d->offset);
1494}
1495
1496static int isofs_iget5_set(struct inode *ino, void *data)
1497{
1498        struct iso_inode_info *i = ISOFS_I(ino);
1499        struct isofs_iget5_callback_data *d =
1500                (struct isofs_iget5_callback_data*)data;
1501        i->i_iget5_block = d->block;
1502        i->i_iget5_offset = d->offset;
1503        return 0;
1504}
1505
1506/* Store, in the inode's containing structure, the block and block
1507 * offset that point to the underlying meta-data for the inode.  The
1508 * code below is otherwise similar to the iget() code in
1509 * include/linux/fs.h */
1510struct inode *isofs_iget(struct super_block *sb,
1511                         unsigned long block,
1512                         unsigned long offset)
1513{
1514        unsigned long hashval;
1515        struct inode *inode;
1516        struct isofs_iget5_callback_data data;
1517        long ret;
1518
1519        if (offset >= 1ul << sb->s_blocksize_bits)
1520                return ERR_PTR(-EINVAL);
1521
1522        data.block = block;
1523        data.offset = offset;
1524
1525        hashval = (block << sb->s_blocksize_bits) | offset;
1526
1527        inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1528                                &isofs_iget5_set, &data);
1529
1530        if (!inode)
1531                return ERR_PTR(-ENOMEM);
1532
1533        if (inode->i_state & I_NEW) {
1534                ret = isofs_read_inode(inode);
1535                if (ret < 0) {
1536                        iget_failed(inode);
1537                        inode = ERR_PTR(ret);
1538                } else {
1539                        unlock_new_inode(inode);
1540                }
1541        }
1542
1543        return inode;
1544}
1545
1546static struct dentry *isofs_mount(struct file_system_type *fs_type,
1547        int flags, const char *dev_name, void *data)
1548{
1549        return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1550}
1551
1552static struct file_system_type iso9660_fs_type = {
1553        .owner          = THIS_MODULE,
1554        .name           = "iso9660",
1555        .mount          = isofs_mount,
1556        .kill_sb        = kill_block_super,
1557        .fs_flags       = FS_REQUIRES_DEV,
1558};
1559
1560static int __init init_iso9660_fs(void)
1561{
1562        int err = init_inodecache();
1563        if (err)
1564                goto out;
1565#ifdef CONFIG_ZISOFS
1566        err = zisofs_init();
1567        if (err)
1568                goto out1;
1569#endif
1570        err = register_filesystem(&iso9660_fs_type);
1571        if (err)
1572                goto out2;
1573        return 0;
1574out2:
1575#ifdef CONFIG_ZISOFS
1576        zisofs_cleanup();
1577out1:
1578#endif
1579        destroy_inodecache();
1580out:
1581        return err;
1582}
1583
1584static void __exit exit_iso9660_fs(void)
1585{
1586        unregister_filesystem(&iso9660_fs_type);
1587#ifdef CONFIG_ZISOFS
1588        zisofs_cleanup();
1589#endif
1590        destroy_inodecache();
1591}
1592
1593module_init(init_iso9660_fs)
1594module_exit(exit_iso9660_fs)
1595MODULE_LICENSE("GPL");
1596/* Actual filesystem name is iso9660, as requested in filesystems.c */
1597MODULE_ALIAS("iso9660");
1598
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