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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *  linux/fs/isofs/inode.c
0004  *
0005  *  (C) 1991  Linus Torvalds - minix filesystem
0006  *      1992, 1993, 1994  Eric Youngdale Modified for ISO 9660 filesystem.
0007  *      1994  Eberhard Mönkeberg - multi session handling.
0008  *      1995  Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
0009  *  1997  Gordon Chaffee - Joliet CDs
0010  *  1998  Eric Lammerts - ISO 9660 Level 3
0011  *  2004  Paul Serice - Inode Support pushed out from 4GB to 128GB
0012  *  2004  Paul Serice - NFS Export Operations
0013  */
0014 
0015 #include <linux/init.h>
0016 #include <linux/module.h>
0017 
0018 #include <linux/slab.h>
0019 #include <linux/cred.h>
0020 #include <linux/nls.h>
0021 #include <linux/ctype.h>
0022 #include <linux/statfs.h>
0023 #include <linux/cdrom.h>
0024 #include <linux/parser.h>
0025 #include <linux/mpage.h>
0026 #include <linux/user_namespace.h>
0027 #include <linux/seq_file.h>
0028 #include <linux/blkdev.h>
0029 
0030 #include "isofs.h"
0031 #include "zisofs.h"
0032 
0033 /* max tz offset is 13 hours */
0034 #define MAX_TZ_OFFSET (52*15*60)
0035 
0036 #define BEQUIET
0037 
0038 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
0039 static int isofs_dentry_cmpi(const struct dentry *dentry,
0040         unsigned int len, const char *str, const struct qstr *name);
0041 
0042 #ifdef CONFIG_JOLIET
0043 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
0044 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
0045 static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
0046         unsigned int len, const char *str, const struct qstr *name);
0047 static int isofs_dentry_cmp_ms(const struct dentry *dentry,
0048         unsigned int len, const char *str, const struct qstr *name);
0049 #endif
0050 
0051 static void isofs_put_super(struct super_block *sb)
0052 {
0053     struct isofs_sb_info *sbi = ISOFS_SB(sb);
0054 
0055 #ifdef CONFIG_JOLIET
0056     unload_nls(sbi->s_nls_iocharset);
0057 #endif
0058 
0059     kfree(sbi);
0060     sb->s_fs_info = NULL;
0061     return;
0062 }
0063 
0064 static int isofs_read_inode(struct inode *, int relocated);
0065 static int isofs_statfs (struct dentry *, struct kstatfs *);
0066 static int isofs_show_options(struct seq_file *, struct dentry *);
0067 
0068 static struct kmem_cache *isofs_inode_cachep;
0069 
0070 static struct inode *isofs_alloc_inode(struct super_block *sb)
0071 {
0072     struct iso_inode_info *ei;
0073     ei = alloc_inode_sb(sb, isofs_inode_cachep, GFP_KERNEL);
0074     if (!ei)
0075         return NULL;
0076     return &ei->vfs_inode;
0077 }
0078 
0079 static void isofs_free_inode(struct inode *inode)
0080 {
0081     kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
0082 }
0083 
0084 static void init_once(void *foo)
0085 {
0086     struct iso_inode_info *ei = foo;
0087 
0088     inode_init_once(&ei->vfs_inode);
0089 }
0090 
0091 static int __init init_inodecache(void)
0092 {
0093     isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
0094                     sizeof(struct iso_inode_info),
0095                     0, (SLAB_RECLAIM_ACCOUNT|
0096                     SLAB_MEM_SPREAD|SLAB_ACCOUNT),
0097                     init_once);
0098     if (!isofs_inode_cachep)
0099         return -ENOMEM;
0100     return 0;
0101 }
0102 
0103 static void destroy_inodecache(void)
0104 {
0105     /*
0106      * Make sure all delayed rcu free inodes are flushed before we
0107      * destroy cache.
0108      */
0109     rcu_barrier();
0110     kmem_cache_destroy(isofs_inode_cachep);
0111 }
0112 
0113 static int isofs_remount(struct super_block *sb, int *flags, char *data)
0114 {
0115     sync_filesystem(sb);
0116     if (!(*flags & SB_RDONLY))
0117         return -EROFS;
0118     return 0;
0119 }
0120 
0121 static const struct super_operations isofs_sops = {
0122     .alloc_inode    = isofs_alloc_inode,
0123     .free_inode = isofs_free_inode,
0124     .put_super  = isofs_put_super,
0125     .statfs     = isofs_statfs,
0126     .remount_fs = isofs_remount,
0127     .show_options   = isofs_show_options,
0128 };
0129 
0130 
0131 static const struct dentry_operations isofs_dentry_ops[] = {
0132     {
0133         .d_hash     = isofs_hashi,
0134         .d_compare  = isofs_dentry_cmpi,
0135     },
0136 #ifdef CONFIG_JOLIET
0137     {
0138         .d_hash     = isofs_hash_ms,
0139         .d_compare  = isofs_dentry_cmp_ms,
0140     },
0141     {
0142         .d_hash     = isofs_hashi_ms,
0143         .d_compare  = isofs_dentry_cmpi_ms,
0144     },
0145 #endif
0146 };
0147 
0148 struct iso9660_options{
0149     unsigned int rock:1;
0150     unsigned int joliet:1;
0151     unsigned int cruft:1;
0152     unsigned int hide:1;
0153     unsigned int showassoc:1;
0154     unsigned int nocompress:1;
0155     unsigned int overriderockperm:1;
0156     unsigned int uid_set:1;
0157     unsigned int gid_set:1;
0158     unsigned char map;
0159     unsigned char check;
0160     unsigned int blocksize;
0161     umode_t fmode;
0162     umode_t dmode;
0163     kgid_t gid;
0164     kuid_t uid;
0165     char *iocharset;
0166     /* LVE */
0167     s32 session;
0168     s32 sbsector;
0169 };
0170 
0171 /*
0172  * Compute the hash for the isofs name corresponding to the dentry.
0173  */
0174 static int
0175 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
0176 {
0177     const char *name;
0178     int len;
0179     char c;
0180     unsigned long hash;
0181 
0182     len = qstr->len;
0183     name = qstr->name;
0184     if (ms) {
0185         while (len && name[len-1] == '.')
0186             len--;
0187     }
0188 
0189     hash = init_name_hash(dentry);
0190     while (len--) {
0191         c = tolower(*name++);
0192         hash = partial_name_hash(c, hash);
0193     }
0194     qstr->hash = end_name_hash(hash);
0195 
0196     return 0;
0197 }
0198 
0199 /*
0200  * Compare of two isofs names.
0201  */
0202 static int isofs_dentry_cmp_common(
0203         unsigned int len, const char *str,
0204         const struct qstr *name, int ms, int ci)
0205 {
0206     int alen, blen;
0207 
0208     /* A filename cannot end in '.' or we treat it like it has none */
0209     alen = name->len;
0210     blen = len;
0211     if (ms) {
0212         while (alen && name->name[alen-1] == '.')
0213             alen--;
0214         while (blen && str[blen-1] == '.')
0215             blen--;
0216     }
0217     if (alen == blen) {
0218         if (ci) {
0219             if (strncasecmp(name->name, str, alen) == 0)
0220                 return 0;
0221         } else {
0222             if (strncmp(name->name, str, alen) == 0)
0223                 return 0;
0224         }
0225     }
0226     return 1;
0227 }
0228 
0229 static int
0230 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
0231 {
0232     return isofs_hashi_common(dentry, qstr, 0);
0233 }
0234 
0235 static int
0236 isofs_dentry_cmpi(const struct dentry *dentry,
0237         unsigned int len, const char *str, const struct qstr *name)
0238 {
0239     return isofs_dentry_cmp_common(len, str, name, 0, 1);
0240 }
0241 
0242 #ifdef CONFIG_JOLIET
0243 /*
0244  * Compute the hash for the isofs name corresponding to the dentry.
0245  */
0246 static int
0247 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
0248 {
0249     const char *name;
0250     int len;
0251 
0252     len = qstr->len;
0253     name = qstr->name;
0254     if (ms) {
0255         while (len && name[len-1] == '.')
0256             len--;
0257     }
0258 
0259     qstr->hash = full_name_hash(dentry, name, len);
0260 
0261     return 0;
0262 }
0263 
0264 static int
0265 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
0266 {
0267     return isofs_hash_common(dentry, qstr, 1);
0268 }
0269 
0270 static int
0271 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
0272 {
0273     return isofs_hashi_common(dentry, qstr, 1);
0274 }
0275 
0276 static int
0277 isofs_dentry_cmp_ms(const struct dentry *dentry,
0278         unsigned int len, const char *str, const struct qstr *name)
0279 {
0280     return isofs_dentry_cmp_common(len, str, name, 1, 0);
0281 }
0282 
0283 static int
0284 isofs_dentry_cmpi_ms(const struct dentry *dentry,
0285         unsigned int len, const char *str, const struct qstr *name)
0286 {
0287     return isofs_dentry_cmp_common(len, str, name, 1, 1);
0288 }
0289 #endif
0290 
0291 enum {
0292     Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
0293     Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
0294     Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
0295     Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
0296 };
0297 
0298 static const match_table_t tokens = {
0299     {Opt_norock, "norock"},
0300     {Opt_nojoliet, "nojoliet"},
0301     {Opt_unhide, "unhide"},
0302     {Opt_hide, "hide"},
0303     {Opt_showassoc, "showassoc"},
0304     {Opt_cruft, "cruft"},
0305     {Opt_utf8, "utf8"},
0306     {Opt_iocharset, "iocharset=%s"},
0307     {Opt_map_a, "map=acorn"},
0308     {Opt_map_a, "map=a"},
0309     {Opt_map_n, "map=normal"},
0310     {Opt_map_n, "map=n"},
0311     {Opt_map_o, "map=off"},
0312     {Opt_map_o, "map=o"},
0313     {Opt_session, "session=%u"},
0314     {Opt_sb, "sbsector=%u"},
0315     {Opt_check_r, "check=relaxed"},
0316     {Opt_check_r, "check=r"},
0317     {Opt_check_s, "check=strict"},
0318     {Opt_check_s, "check=s"},
0319     {Opt_uid, "uid=%u"},
0320     {Opt_gid, "gid=%u"},
0321     {Opt_mode, "mode=%u"},
0322     {Opt_dmode, "dmode=%u"},
0323     {Opt_overriderockperm, "overriderockperm"},
0324     {Opt_block, "block=%u"},
0325     {Opt_ignore, "conv=binary"},
0326     {Opt_ignore, "conv=b"},
0327     {Opt_ignore, "conv=text"},
0328     {Opt_ignore, "conv=t"},
0329     {Opt_ignore, "conv=mtext"},
0330     {Opt_ignore, "conv=m"},
0331     {Opt_ignore, "conv=auto"},
0332     {Opt_ignore, "conv=a"},
0333     {Opt_nocompress, "nocompress"},
0334     {Opt_err, NULL}
0335 };
0336 
0337 static int parse_options(char *options, struct iso9660_options *popt)
0338 {
0339     char *p;
0340     int option;
0341     unsigned int uv;
0342 
0343     popt->map = 'n';
0344     popt->rock = 1;
0345     popt->joliet = 1;
0346     popt->cruft = 0;
0347     popt->hide = 0;
0348     popt->showassoc = 0;
0349     popt->check = 'u';      /* unset */
0350     popt->nocompress = 0;
0351     popt->blocksize = 1024;
0352     popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
0353     popt->uid_set = 0;
0354     popt->gid_set = 0;
0355     popt->gid = GLOBAL_ROOT_GID;
0356     popt->uid = GLOBAL_ROOT_UID;
0357     popt->iocharset = NULL;
0358     popt->overriderockperm = 0;
0359     popt->session=-1;
0360     popt->sbsector=-1;
0361     if (!options)
0362         return 1;
0363 
0364     while ((p = strsep(&options, ",")) != NULL) {
0365         int token;
0366         substring_t args[MAX_OPT_ARGS];
0367         unsigned n;
0368 
0369         if (!*p)
0370             continue;
0371 
0372         token = match_token(p, tokens, args);
0373         switch (token) {
0374         case Opt_norock:
0375             popt->rock = 0;
0376             break;
0377         case Opt_nojoliet:
0378             popt->joliet = 0;
0379             break;
0380         case Opt_hide:
0381             popt->hide = 1;
0382             break;
0383         case Opt_unhide:
0384         case Opt_showassoc:
0385             popt->showassoc = 1;
0386             break;
0387         case Opt_cruft:
0388             popt->cruft = 1;
0389             break;
0390 #ifdef CONFIG_JOLIET
0391         case Opt_utf8:
0392             kfree(popt->iocharset);
0393             popt->iocharset = kstrdup("utf8", GFP_KERNEL);
0394             if (!popt->iocharset)
0395                 return 0;
0396             break;
0397         case Opt_iocharset:
0398             kfree(popt->iocharset);
0399             popt->iocharset = match_strdup(&args[0]);
0400             if (!popt->iocharset)
0401                 return 0;
0402             break;
0403 #endif
0404         case Opt_map_a:
0405             popt->map = 'a';
0406             break;
0407         case Opt_map_o:
0408             popt->map = 'o';
0409             break;
0410         case Opt_map_n:
0411             popt->map = 'n';
0412             break;
0413         case Opt_session:
0414             if (match_int(&args[0], &option))
0415                 return 0;
0416             n = option;
0417             /*
0418              * Track numbers are supposed to be in range 1-99, the
0419              * mount option starts indexing at 0.
0420              */
0421             if (n >= 99)
0422                 return 0;
0423             popt->session = n + 1;
0424             break;
0425         case Opt_sb:
0426             if (match_int(&args[0], &option))
0427                 return 0;
0428             popt->sbsector = option;
0429             break;
0430         case Opt_check_r:
0431             popt->check = 'r';
0432             break;
0433         case Opt_check_s:
0434             popt->check = 's';
0435             break;
0436         case Opt_ignore:
0437             break;
0438         case Opt_uid:
0439             if (match_uint(&args[0], &uv))
0440                 return 0;
0441             popt->uid = make_kuid(current_user_ns(), uv);
0442             if (!uid_valid(popt->uid))
0443                 return 0;
0444             popt->uid_set = 1;
0445             break;
0446         case Opt_gid:
0447             if (match_uint(&args[0], &uv))
0448                 return 0;
0449             popt->gid = make_kgid(current_user_ns(), uv);
0450             if (!gid_valid(popt->gid))
0451                 return 0;
0452             popt->gid_set = 1;
0453             break;
0454         case Opt_mode:
0455             if (match_int(&args[0], &option))
0456                 return 0;
0457             popt->fmode = option;
0458             break;
0459         case Opt_dmode:
0460             if (match_int(&args[0], &option))
0461                 return 0;
0462             popt->dmode = option;
0463             break;
0464         case Opt_overriderockperm:
0465             popt->overriderockperm = 1;
0466             break;
0467         case Opt_block:
0468             if (match_int(&args[0], &option))
0469                 return 0;
0470             n = option;
0471             if (n != 512 && n != 1024 && n != 2048)
0472                 return 0;
0473             popt->blocksize = n;
0474             break;
0475         case Opt_nocompress:
0476             popt->nocompress = 1;
0477             break;
0478         default:
0479             return 0;
0480         }
0481     }
0482     return 1;
0483 }
0484 
0485 /*
0486  * Display the mount options in /proc/mounts.
0487  */
0488 static int isofs_show_options(struct seq_file *m, struct dentry *root)
0489 {
0490     struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
0491 
0492     if (!sbi->s_rock)       seq_puts(m, ",norock");
0493     else if (!sbi->s_joliet_level)  seq_puts(m, ",nojoliet");
0494     if (sbi->s_cruft)       seq_puts(m, ",cruft");
0495     if (sbi->s_hide)        seq_puts(m, ",hide");
0496     if (sbi->s_nocompress)      seq_puts(m, ",nocompress");
0497     if (sbi->s_overriderockperm)    seq_puts(m, ",overriderockperm");
0498     if (sbi->s_showassoc)       seq_puts(m, ",showassoc");
0499 
0500     if (sbi->s_check)       seq_printf(m, ",check=%c", sbi->s_check);
0501     if (sbi->s_mapping)     seq_printf(m, ",map=%c", sbi->s_mapping);
0502     if (sbi->s_session != 255)  seq_printf(m, ",session=%u", sbi->s_session - 1);
0503     if (sbi->s_sbsector != -1)  seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
0504 
0505     if (root->d_sb->s_blocksize != 1024)
0506         seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
0507 
0508     if (sbi->s_uid_set)
0509         seq_printf(m, ",uid=%u",
0510                from_kuid_munged(&init_user_ns, sbi->s_uid));
0511     if (sbi->s_gid_set)
0512         seq_printf(m, ",gid=%u",
0513                from_kgid_munged(&init_user_ns, sbi->s_gid));
0514 
0515     if (sbi->s_dmode != ISOFS_INVALID_MODE)
0516         seq_printf(m, ",dmode=%o", sbi->s_dmode);
0517     if (sbi->s_fmode != ISOFS_INVALID_MODE)
0518         seq_printf(m, ",fmode=%o", sbi->s_fmode);
0519 
0520 #ifdef CONFIG_JOLIET
0521     if (sbi->s_nls_iocharset)
0522         seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
0523     else
0524         seq_puts(m, ",iocharset=utf8");
0525 #endif
0526     return 0;
0527 }
0528 
0529 /*
0530  * look if the driver can tell the multi session redirection value
0531  *
0532  * don't change this if you don't know what you do, please!
0533  * Multisession is legal only with XA disks.
0534  * A non-XA disk with more than one volume descriptor may do it right, but
0535  * usually is written in a nowhere standardized "multi-partition" manner.
0536  * Multisession uses absolute addressing (solely the first frame of the whole
0537  * track is #0), multi-partition uses relative addressing (each first frame of
0538  * each track is #0), and a track is not a session.
0539  *
0540  * A broken CDwriter software or drive firmware does not set new standards,
0541  * at least not if conflicting with the existing ones.
0542  *
0543  * emoenke@gwdg.de
0544  */
0545 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
0546 
0547 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
0548 {
0549     struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
0550     unsigned int vol_desc_start = 0;
0551 
0552     if (session > 0) {
0553         struct cdrom_tocentry te;
0554 
0555         if (!cdi)
0556             return 0;
0557 
0558         te.cdte_track = session;
0559         te.cdte_format = CDROM_LBA;
0560         if (cdrom_read_tocentry(cdi, &te) == 0) {
0561             printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
0562                 session, te.cdte_addr.lba,
0563                 te.cdte_ctrl & CDROM_DATA_TRACK);
0564             if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4)
0565                 return te.cdte_addr.lba;
0566         }
0567 
0568         printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
0569     }
0570 
0571     if (cdi) {
0572         struct cdrom_multisession ms_info;
0573 
0574         ms_info.addr_format = CDROM_LBA;
0575         if (cdrom_multisession(cdi, &ms_info) == 0) {
0576 #if WE_OBEY_THE_WRITTEN_STANDARDS
0577             /* necessary for a valid ms_info.addr */
0578             if (ms_info.xa_flag)
0579 #endif
0580                 vol_desc_start = ms_info.addr.lba;
0581         }
0582     }
0583 
0584     return vol_desc_start;
0585 }
0586 
0587 /*
0588  * Check if root directory is empty (has less than 3 files).
0589  *
0590  * Used to detect broken CDs where ISO root directory is empty but Joliet root
0591  * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
0592  * (and Joliet used instead) or else no files would be visible.
0593  */
0594 static bool rootdir_empty(struct super_block *sb, unsigned long block)
0595 {
0596     int offset = 0, files = 0, de_len;
0597     struct iso_directory_record *de;
0598     struct buffer_head *bh;
0599 
0600     bh = sb_bread(sb, block);
0601     if (!bh)
0602         return true;
0603     while (files < 3) {
0604         de = (struct iso_directory_record *) (bh->b_data + offset);
0605         de_len = *(unsigned char *) de;
0606         if (de_len == 0)
0607             break;
0608         files++;
0609         offset += de_len;
0610     }
0611     brelse(bh);
0612     return files < 3;
0613 }
0614 
0615 /*
0616  * Initialize the superblock and read the root inode.
0617  */
0618 static int isofs_fill_super(struct super_block *s, void *data, int silent)
0619 {
0620     struct buffer_head *bh = NULL, *pri_bh = NULL;
0621     struct hs_primary_descriptor *h_pri = NULL;
0622     struct iso_primary_descriptor *pri = NULL;
0623     struct iso_supplementary_descriptor *sec = NULL;
0624     struct iso_directory_record *rootp;
0625     struct inode *inode;
0626     struct iso9660_options opt;
0627     struct isofs_sb_info *sbi;
0628     unsigned long first_data_zone;
0629     int joliet_level = 0;
0630     int iso_blknum, block;
0631     int orig_zonesize;
0632     int table, error = -EINVAL;
0633     unsigned int vol_desc_start;
0634 
0635     sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
0636     if (!sbi)
0637         return -ENOMEM;
0638     s->s_fs_info = sbi;
0639 
0640     if (!parse_options((char *)data, &opt))
0641         goto out_freesbi;
0642 
0643     /*
0644      * First of all, get the hardware blocksize for this device.
0645      * If we don't know what it is, or the hardware blocksize is
0646      * larger than the blocksize the user specified, then use
0647      * that value.
0648      */
0649     /*
0650      * What if bugger tells us to go beyond page size?
0651      */
0652     if (bdev_logical_block_size(s->s_bdev) > 2048) {
0653         printk(KERN_WARNING
0654                "ISOFS: unsupported/invalid hardware sector size %d\n",
0655             bdev_logical_block_size(s->s_bdev));
0656         goto out_freesbi;
0657     }
0658     opt.blocksize = sb_min_blocksize(s, opt.blocksize);
0659 
0660     sbi->s_high_sierra = 0; /* default is iso9660 */
0661     sbi->s_session = opt.session;
0662     sbi->s_sbsector = opt.sbsector;
0663 
0664     vol_desc_start = (opt.sbsector != -1) ?
0665         opt.sbsector : isofs_get_last_session(s,opt.session);
0666 
0667     for (iso_blknum = vol_desc_start+16;
0668         iso_blknum < vol_desc_start+100; iso_blknum++) {
0669         struct hs_volume_descriptor *hdp;
0670         struct iso_volume_descriptor  *vdp;
0671 
0672         block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
0673         if (!(bh = sb_bread(s, block)))
0674             goto out_no_read;
0675 
0676         vdp = (struct iso_volume_descriptor *)bh->b_data;
0677         hdp = (struct hs_volume_descriptor *)bh->b_data;
0678 
0679         /*
0680          * Due to the overlapping physical location of the descriptors,
0681          * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
0682          * proper identification in this case, we first check for ISO.
0683          */
0684         if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
0685             if (isonum_711(vdp->type) == ISO_VD_END)
0686                 break;
0687             if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
0688                 if (!pri) {
0689                     pri = (struct iso_primary_descriptor *)vdp;
0690                     /* Save the buffer in case we need it ... */
0691                     pri_bh = bh;
0692                     bh = NULL;
0693                 }
0694             }
0695 #ifdef CONFIG_JOLIET
0696             else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
0697                 sec = (struct iso_supplementary_descriptor *)vdp;
0698                 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
0699                     if (opt.joliet) {
0700                         if (sec->escape[2] == 0x40)
0701                             joliet_level = 1;
0702                         else if (sec->escape[2] == 0x43)
0703                             joliet_level = 2;
0704                         else if (sec->escape[2] == 0x45)
0705                             joliet_level = 3;
0706 
0707                         printk(KERN_DEBUG "ISO 9660 Extensions: "
0708                             "Microsoft Joliet Level %d\n",
0709                             joliet_level);
0710                     }
0711                     goto root_found;
0712                 } else {
0713                 /* Unknown supplementary volume descriptor */
0714                 sec = NULL;
0715                 }
0716             }
0717 #endif
0718         } else {
0719             if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
0720                 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
0721                     goto out_freebh;
0722 
0723                 sbi->s_high_sierra = 1;
0724                 opt.rock = 0;
0725                 h_pri = (struct hs_primary_descriptor *)vdp;
0726                 goto root_found;
0727             }
0728         }
0729 
0730         /* Just skip any volume descriptors we don't recognize */
0731 
0732         brelse(bh);
0733         bh = NULL;
0734     }
0735     /*
0736      * If we fall through, either no volume descriptor was found,
0737      * or else we passed a primary descriptor looking for others.
0738      */
0739     if (!pri)
0740         goto out_unknown_format;
0741     brelse(bh);
0742     bh = pri_bh;
0743     pri_bh = NULL;
0744 
0745 root_found:
0746     /* We don't support read-write mounts */
0747     if (!sb_rdonly(s)) {
0748         error = -EACCES;
0749         goto out_freebh;
0750     }
0751 
0752     if (joliet_level && (!pri || !opt.rock)) {
0753         /* This is the case of Joliet with the norock mount flag.
0754          * A disc with both Joliet and Rock Ridge is handled later
0755          */
0756         pri = (struct iso_primary_descriptor *) sec;
0757     }
0758 
0759     if(sbi->s_high_sierra){
0760         rootp = (struct iso_directory_record *) h_pri->root_directory_record;
0761         sbi->s_nzones = isonum_733(h_pri->volume_space_size);
0762         sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
0763         sbi->s_max_size = isonum_733(h_pri->volume_space_size);
0764     } else {
0765         if (!pri)
0766             goto out_freebh;
0767         rootp = (struct iso_directory_record *) pri->root_directory_record;
0768         sbi->s_nzones = isonum_733(pri->volume_space_size);
0769         sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
0770         sbi->s_max_size = isonum_733(pri->volume_space_size);
0771     }
0772 
0773     sbi->s_ninodes = 0; /* No way to figure this out easily */
0774 
0775     orig_zonesize = sbi->s_log_zone_size;
0776     /*
0777      * If the zone size is smaller than the hardware sector size,
0778      * this is a fatal error.  This would occur if the disc drive
0779      * had sectors that were 2048 bytes, but the filesystem had
0780      * blocks that were 512 bytes (which should only very rarely
0781      * happen.)
0782      */
0783     if (orig_zonesize < opt.blocksize)
0784         goto out_bad_size;
0785 
0786     /* RDE: convert log zone size to bit shift */
0787     switch (sbi->s_log_zone_size) {
0788     case  512: sbi->s_log_zone_size =  9; break;
0789     case 1024: sbi->s_log_zone_size = 10; break;
0790     case 2048: sbi->s_log_zone_size = 11; break;
0791 
0792     default:
0793         goto out_bad_zone_size;
0794     }
0795 
0796     s->s_magic = ISOFS_SUPER_MAGIC;
0797 
0798     /*
0799      * With multi-extent files, file size is only limited by the maximum
0800      * size of a file system, which is 8 TB.
0801      */
0802     s->s_maxbytes = 0x80000000000LL;
0803 
0804     /* ECMA-119 timestamp from 1900/1/1 with tz offset */
0805     s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
0806     s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
0807 
0808     /* Set this for reference. Its not currently used except on write
0809        which we don't have .. */
0810 
0811     first_data_zone = isonum_733(rootp->extent) +
0812               isonum_711(rootp->ext_attr_length);
0813     sbi->s_firstdatazone = first_data_zone;
0814 #ifndef BEQUIET
0815     printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
0816         sbi->s_max_size, 1UL << sbi->s_log_zone_size);
0817     printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
0818     if(sbi->s_high_sierra)
0819         printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
0820 #endif
0821 
0822     /*
0823      * If the Joliet level is set, we _may_ decide to use the
0824      * secondary descriptor, but can't be sure until after we
0825      * read the root inode. But before reading the root inode
0826      * we may need to change the device blocksize, and would
0827      * rather release the old buffer first. So, we cache the
0828      * first_data_zone value from the secondary descriptor.
0829      */
0830     if (joliet_level) {
0831         pri = (struct iso_primary_descriptor *) sec;
0832         rootp = (struct iso_directory_record *)
0833             pri->root_directory_record;
0834         first_data_zone = isonum_733(rootp->extent) +
0835                 isonum_711(rootp->ext_attr_length);
0836     }
0837 
0838     /*
0839      * We're all done using the volume descriptor, and may need
0840      * to change the device blocksize, so release the buffer now.
0841      */
0842     brelse(pri_bh);
0843     brelse(bh);
0844 
0845     /*
0846      * Force the blocksize to 512 for 512 byte sectors.  The file
0847      * read primitives really get it wrong in a bad way if we don't
0848      * do this.
0849      *
0850      * Note - we should never be setting the blocksize to something
0851      * less than the hardware sector size for the device.  If we
0852      * do, we would end up having to read larger buffers and split
0853      * out portions to satisfy requests.
0854      *
0855      * Note2- the idea here is that we want to deal with the optimal
0856      * zonesize in the filesystem.  If we have it set to something less,
0857      * then we have horrible problems with trying to piece together
0858      * bits of adjacent blocks in order to properly read directory
0859      * entries.  By forcing the blocksize in this way, we ensure
0860      * that we will never be required to do this.
0861      */
0862     sb_set_blocksize(s, orig_zonesize);
0863 
0864     sbi->s_nls_iocharset = NULL;
0865 
0866 #ifdef CONFIG_JOLIET
0867     if (joliet_level) {
0868         char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
0869         if (strcmp(p, "utf8") != 0) {
0870             sbi->s_nls_iocharset = opt.iocharset ?
0871                 load_nls(opt.iocharset) : load_nls_default();
0872             if (!sbi->s_nls_iocharset)
0873                 goto out_freesbi;
0874         }
0875     }
0876 #endif
0877     s->s_op = &isofs_sops;
0878     s->s_export_op = &isofs_export_ops;
0879     sbi->s_mapping = opt.map;
0880     sbi->s_rock = (opt.rock ? 2 : 0);
0881     sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
0882     sbi->s_cruft = opt.cruft;
0883     sbi->s_hide = opt.hide;
0884     sbi->s_showassoc = opt.showassoc;
0885     sbi->s_uid = opt.uid;
0886     sbi->s_gid = opt.gid;
0887     sbi->s_uid_set = opt.uid_set;
0888     sbi->s_gid_set = opt.gid_set;
0889     sbi->s_nocompress = opt.nocompress;
0890     sbi->s_overriderockperm = opt.overriderockperm;
0891     /*
0892      * It would be incredibly stupid to allow people to mark every file
0893      * on the disk as suid, so we merely allow them to set the default
0894      * permissions.
0895      */
0896     if (opt.fmode != ISOFS_INVALID_MODE)
0897         sbi->s_fmode = opt.fmode & 0777;
0898     else
0899         sbi->s_fmode = ISOFS_INVALID_MODE;
0900     if (opt.dmode != ISOFS_INVALID_MODE)
0901         sbi->s_dmode = opt.dmode & 0777;
0902     else
0903         sbi->s_dmode = ISOFS_INVALID_MODE;
0904 
0905     /*
0906      * Read the root inode, which _may_ result in changing
0907      * the s_rock flag. Once we have the final s_rock value,
0908      * we then decide whether to use the Joliet descriptor.
0909      */
0910     inode = isofs_iget(s, sbi->s_firstdatazone, 0);
0911     if (IS_ERR(inode))
0912         goto out_no_root;
0913 
0914     /*
0915      * Fix for broken CDs with Rock Ridge and empty ISO root directory but
0916      * correct Joliet root directory.
0917      */
0918     if (sbi->s_rock == 1 && joliet_level &&
0919                 rootdir_empty(s, sbi->s_firstdatazone)) {
0920         printk(KERN_NOTICE
0921             "ISOFS: primary root directory is empty. "
0922             "Disabling Rock Ridge and switching to Joliet.");
0923         sbi->s_rock = 0;
0924     }
0925 
0926     /*
0927      * If this disk has both Rock Ridge and Joliet on it, then we
0928      * want to use Rock Ridge by default.  This can be overridden
0929      * by using the norock mount option.  There is still one other
0930      * possibility that is not taken into account: a Rock Ridge
0931      * CD with Unicode names.  Until someone sees such a beast, it
0932      * will not be supported.
0933      */
0934     if (sbi->s_rock == 1) {
0935         joliet_level = 0;
0936     } else if (joliet_level) {
0937         sbi->s_rock = 0;
0938         if (sbi->s_firstdatazone != first_data_zone) {
0939             sbi->s_firstdatazone = first_data_zone;
0940             printk(KERN_DEBUG
0941                 "ISOFS: changing to secondary root\n");
0942             iput(inode);
0943             inode = isofs_iget(s, sbi->s_firstdatazone, 0);
0944             if (IS_ERR(inode))
0945                 goto out_no_root;
0946         }
0947     }
0948 
0949     if (opt.check == 'u') {
0950         /* Only Joliet is case insensitive by default */
0951         if (joliet_level)
0952             opt.check = 'r';
0953         else
0954             opt.check = 's';
0955     }
0956     sbi->s_joliet_level = joliet_level;
0957 
0958     /* Make sure the root inode is a directory */
0959     if (!S_ISDIR(inode->i_mode)) {
0960         printk(KERN_WARNING
0961             "isofs_fill_super: root inode is not a directory. "
0962             "Corrupted media?\n");
0963         goto out_iput;
0964     }
0965 
0966     table = 0;
0967     if (joliet_level)
0968         table += 2;
0969     if (opt.check == 'r')
0970         table++;
0971     sbi->s_check = opt.check;
0972 
0973     if (table)
0974         s->s_d_op = &isofs_dentry_ops[table - 1];
0975 
0976     /* get the root dentry */
0977     s->s_root = d_make_root(inode);
0978     if (!(s->s_root)) {
0979         error = -ENOMEM;
0980         goto out_no_inode;
0981     }
0982 
0983     kfree(opt.iocharset);
0984 
0985     return 0;
0986 
0987     /*
0988      * Display error messages and free resources.
0989      */
0990 out_iput:
0991     iput(inode);
0992     goto out_no_inode;
0993 out_no_root:
0994     error = PTR_ERR(inode);
0995     if (error != -ENOMEM)
0996         printk(KERN_WARNING "%s: get root inode failed\n", __func__);
0997 out_no_inode:
0998 #ifdef CONFIG_JOLIET
0999     unload_nls(sbi->s_nls_iocharset);
1000 #endif
1001     goto out_freesbi;
1002 out_no_read:
1003     printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
1004         __func__, s->s_id, iso_blknum, block);
1005     goto out_freebh;
1006 out_bad_zone_size:
1007     printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
1008         sbi->s_log_zone_size);
1009     goto out_freebh;
1010 out_bad_size:
1011     printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1012         orig_zonesize, opt.blocksize);
1013     goto out_freebh;
1014 out_unknown_format:
1015     if (!silent)
1016         printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1017 
1018 out_freebh:
1019     brelse(bh);
1020     brelse(pri_bh);
1021 out_freesbi:
1022     kfree(opt.iocharset);
1023     kfree(sbi);
1024     s->s_fs_info = NULL;
1025     return error;
1026 }
1027 
1028 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1029 {
1030     struct super_block *sb = dentry->d_sb;
1031     u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1032 
1033     buf->f_type = ISOFS_SUPER_MAGIC;
1034     buf->f_bsize = sb->s_blocksize;
1035     buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1036         << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1037     buf->f_bfree = 0;
1038     buf->f_bavail = 0;
1039     buf->f_files = ISOFS_SB(sb)->s_ninodes;
1040     buf->f_ffree = 0;
1041     buf->f_fsid = u64_to_fsid(id);
1042     buf->f_namelen = NAME_MAX;
1043     return 0;
1044 }
1045 
1046 /*
1047  * Get a set of blocks; filling in buffer_heads if already allocated
1048  * or getblk() if they are not.  Returns the number of blocks inserted
1049  * (-ve == error.)
1050  */
1051 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1052              struct buffer_head **bh, unsigned long nblocks)
1053 {
1054     unsigned long b_off = iblock;
1055     unsigned offset, sect_size;
1056     unsigned int firstext;
1057     unsigned long nextblk, nextoff;
1058     int section, rv, error;
1059     struct iso_inode_info *ei = ISOFS_I(inode);
1060 
1061     error = -EIO;
1062     rv = 0;
1063     if (iblock != b_off) {
1064         printk(KERN_DEBUG "%s: block number too large\n", __func__);
1065         goto abort;
1066     }
1067 
1068 
1069     offset = 0;
1070     firstext = ei->i_first_extent;
1071     sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1072     nextblk = ei->i_next_section_block;
1073     nextoff = ei->i_next_section_offset;
1074     section = 0;
1075 
1076     while (nblocks) {
1077         /* If we are *way* beyond the end of the file, print a message.
1078          * Access beyond the end of the file up to the next page boundary
1079          * is normal, however because of the way the page cache works.
1080          * In this case, we just return 0 so that we can properly fill
1081          * the page with useless information without generating any
1082          * I/O errors.
1083          */
1084         if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1085             printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1086                 __func__, b_off,
1087                 (unsigned long long)inode->i_size);
1088             goto abort;
1089         }
1090 
1091         /* On the last section, nextblk == 0, section size is likely to
1092          * exceed sect_size by a partial block, and access beyond the
1093          * end of the file will reach beyond the section size, too.
1094          */
1095         while (nextblk && (b_off >= (offset + sect_size))) {
1096             struct inode *ninode;
1097 
1098             offset += sect_size;
1099             ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1100             if (IS_ERR(ninode)) {
1101                 error = PTR_ERR(ninode);
1102                 goto abort;
1103             }
1104             firstext  = ISOFS_I(ninode)->i_first_extent;
1105             sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1106             nextblk   = ISOFS_I(ninode)->i_next_section_block;
1107             nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1108             iput(ninode);
1109 
1110             if (++section > 100) {
1111                 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1112                     " aborting...\n", __func__);
1113                 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1114                     "nextblk=%lu nextoff=%lu\n", __func__,
1115                     b_off, firstext, (unsigned) sect_size,
1116                     nextblk, nextoff);
1117                 goto abort;
1118             }
1119         }
1120 
1121         if (*bh) {
1122             map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1123         } else {
1124             *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1125             if (!*bh)
1126                 goto abort;
1127         }
1128         bh++;   /* Next buffer head */
1129         b_off++;    /* Next buffer offset */
1130         nblocks--;
1131         rv++;
1132     }
1133 
1134     error = 0;
1135 abort:
1136     return rv != 0 ? rv : error;
1137 }
1138 
1139 /*
1140  * Used by the standard interfaces.
1141  */
1142 static int isofs_get_block(struct inode *inode, sector_t iblock,
1143             struct buffer_head *bh_result, int create)
1144 {
1145     int ret;
1146 
1147     if (create) {
1148         printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1149         return -EROFS;
1150     }
1151 
1152     ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1153     return ret < 0 ? ret : 0;
1154 }
1155 
1156 static int isofs_bmap(struct inode *inode, sector_t block)
1157 {
1158     struct buffer_head dummy;
1159     int error;
1160 
1161     dummy.b_state = 0;
1162     dummy.b_blocknr = -1000;
1163     error = isofs_get_block(inode, block, &dummy, 0);
1164     if (!error)
1165         return dummy.b_blocknr;
1166     return 0;
1167 }
1168 
1169 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1170 {
1171     sector_t blknr = isofs_bmap(inode, block);
1172     if (!blknr)
1173         return NULL;
1174     return sb_bread(inode->i_sb, blknr);
1175 }
1176 
1177 static int isofs_read_folio(struct file *file, struct folio *folio)
1178 {
1179     return mpage_read_folio(folio, isofs_get_block);
1180 }
1181 
1182 static void isofs_readahead(struct readahead_control *rac)
1183 {
1184     mpage_readahead(rac, isofs_get_block);
1185 }
1186 
1187 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1188 {
1189     return generic_block_bmap(mapping,block,isofs_get_block);
1190 }
1191 
1192 static const struct address_space_operations isofs_aops = {
1193     .read_folio = isofs_read_folio,
1194     .readahead = isofs_readahead,
1195     .bmap = _isofs_bmap
1196 };
1197 
1198 static int isofs_read_level3_size(struct inode *inode)
1199 {
1200     unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1201     int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1202     struct buffer_head *bh = NULL;
1203     unsigned long block, offset, block_saved, offset_saved;
1204     int i = 0;
1205     int more_entries = 0;
1206     struct iso_directory_record *tmpde = NULL;
1207     struct iso_inode_info *ei = ISOFS_I(inode);
1208 
1209     inode->i_size = 0;
1210 
1211     /* The first 16 blocks are reserved as the System Area.  Thus,
1212      * no inodes can appear in block 0.  We use this to flag that
1213      * this is the last section. */
1214     ei->i_next_section_block = 0;
1215     ei->i_next_section_offset = 0;
1216 
1217     block = ei->i_iget5_block;
1218     offset = ei->i_iget5_offset;
1219 
1220     do {
1221         struct iso_directory_record *de;
1222         unsigned int de_len;
1223 
1224         if (!bh) {
1225             bh = sb_bread(inode->i_sb, block);
1226             if (!bh)
1227                 goto out_noread;
1228         }
1229         de = (struct iso_directory_record *) (bh->b_data + offset);
1230         de_len = *(unsigned char *) de;
1231 
1232         if (de_len == 0) {
1233             brelse(bh);
1234             bh = NULL;
1235             ++block;
1236             offset = 0;
1237             continue;
1238         }
1239 
1240         block_saved = block;
1241         offset_saved = offset;
1242         offset += de_len;
1243 
1244         /* Make sure we have a full directory entry */
1245         if (offset >= bufsize) {
1246             int slop = bufsize - offset + de_len;
1247             if (!tmpde) {
1248                 tmpde = kmalloc(256, GFP_KERNEL);
1249                 if (!tmpde)
1250                     goto out_nomem;
1251             }
1252             memcpy(tmpde, de, slop);
1253             offset &= bufsize - 1;
1254             block++;
1255             brelse(bh);
1256             bh = NULL;
1257             if (offset) {
1258                 bh = sb_bread(inode->i_sb, block);
1259                 if (!bh)
1260                     goto out_noread;
1261                 memcpy((void *)tmpde+slop, bh->b_data, offset);
1262             }
1263             de = tmpde;
1264         }
1265 
1266         inode->i_size += isonum_733(de->size);
1267         if (i == 1) {
1268             ei->i_next_section_block = block_saved;
1269             ei->i_next_section_offset = offset_saved;
1270         }
1271 
1272         more_entries = de->flags[-high_sierra] & 0x80;
1273 
1274         i++;
1275         if (i > 100)
1276             goto out_toomany;
1277     } while (more_entries);
1278 out:
1279     kfree(tmpde);
1280     if (bh)
1281         brelse(bh);
1282     return 0;
1283 
1284 out_nomem:
1285     if (bh)
1286         brelse(bh);
1287     return -ENOMEM;
1288 
1289 out_noread:
1290     printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1291     kfree(tmpde);
1292     return -EIO;
1293 
1294 out_toomany:
1295     printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1296         "isofs_read_level3_size: inode=%lu\n",
1297         __func__, inode->i_ino);
1298     goto out;
1299 }
1300 
1301 static int isofs_read_inode(struct inode *inode, int relocated)
1302 {
1303     struct super_block *sb = inode->i_sb;
1304     struct isofs_sb_info *sbi = ISOFS_SB(sb);
1305     unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1306     unsigned long block;
1307     int high_sierra = sbi->s_high_sierra;
1308     struct buffer_head *bh;
1309     struct iso_directory_record *de;
1310     struct iso_directory_record *tmpde = NULL;
1311     unsigned int de_len;
1312     unsigned long offset;
1313     struct iso_inode_info *ei = ISOFS_I(inode);
1314     int ret = -EIO;
1315 
1316     block = ei->i_iget5_block;
1317     bh = sb_bread(inode->i_sb, block);
1318     if (!bh)
1319         goto out_badread;
1320 
1321     offset = ei->i_iget5_offset;
1322 
1323     de = (struct iso_directory_record *) (bh->b_data + offset);
1324     de_len = *(unsigned char *) de;
1325     if (de_len < sizeof(struct iso_directory_record))
1326         goto fail;
1327 
1328     if (offset + de_len > bufsize) {
1329         int frag1 = bufsize - offset;
1330 
1331         tmpde = kmalloc(de_len, GFP_KERNEL);
1332         if (!tmpde) {
1333             ret = -ENOMEM;
1334             goto fail;
1335         }
1336         memcpy(tmpde, bh->b_data + offset, frag1);
1337         brelse(bh);
1338         bh = sb_bread(inode->i_sb, ++block);
1339         if (!bh)
1340             goto out_badread;
1341         memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1342         de = tmpde;
1343     }
1344 
1345     inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1346                     ei->i_iget5_offset,
1347                     ISOFS_BUFFER_BITS(inode));
1348 
1349     /* Assume it is a normal-format file unless told otherwise */
1350     ei->i_file_format = isofs_file_normal;
1351 
1352     if (de->flags[-high_sierra] & 2) {
1353         if (sbi->s_dmode != ISOFS_INVALID_MODE)
1354             inode->i_mode = S_IFDIR | sbi->s_dmode;
1355         else
1356             inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1357         set_nlink(inode, 1);    /*
1358                      * Set to 1.  We know there are 2, but
1359                      * the find utility tries to optimize
1360                      * if it is 2, and it screws up.  It is
1361                      * easier to give 1 which tells find to
1362                      * do it the hard way.
1363                      */
1364     } else {
1365         if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1366             inode->i_mode = S_IFREG | sbi->s_fmode;
1367         } else {
1368             /*
1369              * Set default permissions: r-x for all.  The disc
1370              * could be shared with DOS machines so virtually
1371              * anything could be a valid executable.
1372              */
1373             inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1374         }
1375         set_nlink(inode, 1);
1376     }
1377     inode->i_uid = sbi->s_uid;
1378     inode->i_gid = sbi->s_gid;
1379     inode->i_blocks = 0;
1380 
1381     ei->i_format_parm[0] = 0;
1382     ei->i_format_parm[1] = 0;
1383     ei->i_format_parm[2] = 0;
1384 
1385     ei->i_section_size = isonum_733(de->size);
1386     if (de->flags[-high_sierra] & 0x80) {
1387         ret = isofs_read_level3_size(inode);
1388         if (ret < 0)
1389             goto fail;
1390         ret = -EIO;
1391     } else {
1392         ei->i_next_section_block = 0;
1393         ei->i_next_section_offset = 0;
1394         inode->i_size = isonum_733(de->size);
1395     }
1396 
1397     /*
1398      * Some dipshit decided to store some other bit of information
1399      * in the high byte of the file length.  Truncate size in case
1400      * this CDROM was mounted with the cruft option.
1401      */
1402 
1403     if (sbi->s_cruft)
1404         inode->i_size &= 0x00ffffff;
1405 
1406     if (de->interleave[0]) {
1407         printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1408         inode->i_size = 0;
1409     }
1410 
1411     /* I have no idea what file_unit_size is used for, so
1412        we will flag it for now */
1413     if (de->file_unit_size[0] != 0) {
1414         printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1415             inode->i_ino);
1416     }
1417 
1418     /* I have no idea what other flag bits are used for, so
1419        we will flag it for now */
1420 #ifdef DEBUG
1421     if((de->flags[-high_sierra] & ~2)!= 0){
1422         printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1423                 "(%ld %x).\n",
1424             inode->i_ino, de->flags[-high_sierra]);
1425     }
1426 #endif
1427 
1428     inode->i_mtime.tv_sec =
1429     inode->i_atime.tv_sec =
1430     inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1431     inode->i_mtime.tv_nsec =
1432     inode->i_atime.tv_nsec =
1433     inode->i_ctime.tv_nsec = 0;
1434 
1435     ei->i_first_extent = (isonum_733(de->extent) +
1436             isonum_711(de->ext_attr_length));
1437 
1438     /* Set the number of blocks for stat() - should be done before RR */
1439     inode->i_blocks = (inode->i_size + 511) >> 9;
1440 
1441     /*
1442      * Now test for possible Rock Ridge extensions which will override
1443      * some of these numbers in the inode structure.
1444      */
1445 
1446     if (!high_sierra) {
1447         parse_rock_ridge_inode(de, inode, relocated);
1448         /* if we want uid/gid set, override the rock ridge setting */
1449         if (sbi->s_uid_set)
1450             inode->i_uid = sbi->s_uid;
1451         if (sbi->s_gid_set)
1452             inode->i_gid = sbi->s_gid;
1453     }
1454     /* Now set final access rights if overriding rock ridge setting */
1455     if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1456         sbi->s_dmode != ISOFS_INVALID_MODE)
1457         inode->i_mode = S_IFDIR | sbi->s_dmode;
1458     if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1459         sbi->s_fmode != ISOFS_INVALID_MODE)
1460         inode->i_mode = S_IFREG | sbi->s_fmode;
1461 
1462     /* Install the inode operations vector */
1463     if (S_ISREG(inode->i_mode)) {
1464         inode->i_fop = &generic_ro_fops;
1465         switch (ei->i_file_format) {
1466 #ifdef CONFIG_ZISOFS
1467         case isofs_file_compressed:
1468             inode->i_data.a_ops = &zisofs_aops;
1469             break;
1470 #endif
1471         default:
1472             inode->i_data.a_ops = &isofs_aops;
1473             break;
1474         }
1475     } else if (S_ISDIR(inode->i_mode)) {
1476         inode->i_op = &isofs_dir_inode_operations;
1477         inode->i_fop = &isofs_dir_operations;
1478     } else if (S_ISLNK(inode->i_mode)) {
1479         inode->i_op = &page_symlink_inode_operations;
1480         inode_nohighmem(inode);
1481         inode->i_data.a_ops = &isofs_symlink_aops;
1482     } else
1483         /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1484         init_special_inode(inode, inode->i_mode, inode->i_rdev);
1485 
1486     ret = 0;
1487 out:
1488     kfree(tmpde);
1489     if (bh)
1490         brelse(bh);
1491     return ret;
1492 
1493 out_badread:
1494     printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1495 fail:
1496     goto out;
1497 }
1498 
1499 struct isofs_iget5_callback_data {
1500     unsigned long block;
1501     unsigned long offset;
1502 };
1503 
1504 static int isofs_iget5_test(struct inode *ino, void *data)
1505 {
1506     struct iso_inode_info *i = ISOFS_I(ino);
1507     struct isofs_iget5_callback_data *d =
1508         (struct isofs_iget5_callback_data*)data;
1509     return (i->i_iget5_block == d->block)
1510         && (i->i_iget5_offset == d->offset);
1511 }
1512 
1513 static int isofs_iget5_set(struct inode *ino, void *data)
1514 {
1515     struct iso_inode_info *i = ISOFS_I(ino);
1516     struct isofs_iget5_callback_data *d =
1517         (struct isofs_iget5_callback_data*)data;
1518     i->i_iget5_block = d->block;
1519     i->i_iget5_offset = d->offset;
1520     return 0;
1521 }
1522 
1523 /* Store, in the inode's containing structure, the block and block
1524  * offset that point to the underlying meta-data for the inode.  The
1525  * code below is otherwise similar to the iget() code in
1526  * include/linux/fs.h */
1527 struct inode *__isofs_iget(struct super_block *sb,
1528                unsigned long block,
1529                unsigned long offset,
1530                int relocated)
1531 {
1532     unsigned long hashval;
1533     struct inode *inode;
1534     struct isofs_iget5_callback_data data;
1535     long ret;
1536 
1537     if (offset >= 1ul << sb->s_blocksize_bits)
1538         return ERR_PTR(-EINVAL);
1539 
1540     data.block = block;
1541     data.offset = offset;
1542 
1543     hashval = (block << sb->s_blocksize_bits) | offset;
1544 
1545     inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1546                 &isofs_iget5_set, &data);
1547 
1548     if (!inode)
1549         return ERR_PTR(-ENOMEM);
1550 
1551     if (inode->i_state & I_NEW) {
1552         ret = isofs_read_inode(inode, relocated);
1553         if (ret < 0) {
1554             iget_failed(inode);
1555             inode = ERR_PTR(ret);
1556         } else {
1557             unlock_new_inode(inode);
1558         }
1559     }
1560 
1561     return inode;
1562 }
1563 
1564 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1565     int flags, const char *dev_name, void *data)
1566 {
1567     return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1568 }
1569 
1570 static struct file_system_type iso9660_fs_type = {
1571     .owner      = THIS_MODULE,
1572     .name       = "iso9660",
1573     .mount      = isofs_mount,
1574     .kill_sb    = kill_block_super,
1575     .fs_flags   = FS_REQUIRES_DEV,
1576 };
1577 MODULE_ALIAS_FS("iso9660");
1578 MODULE_ALIAS("iso9660");
1579 
1580 static int __init init_iso9660_fs(void)
1581 {
1582     int err = init_inodecache();
1583     if (err)
1584         goto out;
1585 #ifdef CONFIG_ZISOFS
1586     err = zisofs_init();
1587     if (err)
1588         goto out1;
1589 #endif
1590     err = register_filesystem(&iso9660_fs_type);
1591     if (err)
1592         goto out2;
1593     return 0;
1594 out2:
1595 #ifdef CONFIG_ZISOFS
1596     zisofs_cleanup();
1597 out1:
1598 #endif
1599     destroy_inodecache();
1600 out:
1601     return err;
1602 }
1603 
1604 static void __exit exit_iso9660_fs(void)
1605 {
1606         unregister_filesystem(&iso9660_fs_type);
1607 #ifdef CONFIG_ZISOFS
1608     zisofs_cleanup();
1609 #endif
1610     destroy_inodecache();
1611 }
1612 
1613 module_init(init_iso9660_fs)
1614 module_exit(exit_iso9660_fs)
1615 MODULE_LICENSE("GPL");
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