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