diff options
Diffstat (limited to 'kernel/fs/isofs/inode.c')
| -rw-r--r-- | kernel/fs/isofs/inode.c | 1557 |
1 files changed, 1557 insertions, 0 deletions
diff --git a/kernel/fs/isofs/inode.c b/kernel/fs/isofs/inode.c new file mode 100644 index 000000000..d67a16f2a --- /dev/null +++ b/kernel/fs/isofs/inode.c @@ -0,0 +1,1557 @@ +/* + * linux/fs/isofs/inode.c + * + * (C) 1991 Linus Torvalds - minix filesystem + * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem. + * 1994 Eberhard Mönkeberg - multi session handling. + * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs. + * 1997 Gordon Chaffee - Joliet CDs + * 1998 Eric Lammerts - ISO 9660 Level 3 + * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB + * 2004 Paul Serice - NFS Export Operations + */ + +#include <linux/init.h> +#include <linux/module.h> + +#include <linux/slab.h> +#include <linux/nls.h> +#include <linux/ctype.h> +#include <linux/statfs.h> +#include <linux/cdrom.h> +#include <linux/parser.h> +#include <linux/mpage.h> +#include <linux/user_namespace.h> + +#include "isofs.h" +#include "zisofs.h" + +#define BEQUIET + +static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); +static int isofs_dentry_cmpi(const struct dentry *parent, + const struct dentry *dentry, + unsigned int len, const char *str, const struct qstr *name); + +#ifdef CONFIG_JOLIET +static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); +static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); +static int isofs_dentry_cmpi_ms(const struct dentry *parent, + const struct dentry *dentry, + unsigned int len, const char *str, const struct qstr *name); +static int isofs_dentry_cmp_ms(const struct dentry *parent, + const struct dentry *dentry, + unsigned int len, const char *str, const struct qstr *name); +#endif + +static void isofs_put_super(struct super_block *sb) +{ + struct isofs_sb_info *sbi = ISOFS_SB(sb); + +#ifdef CONFIG_JOLIET + unload_nls(sbi->s_nls_iocharset); +#endif + + kfree(sbi); + sb->s_fs_info = NULL; + return; +} + +static int isofs_read_inode(struct inode *, int relocated); +static int isofs_statfs (struct dentry *, struct kstatfs *); + +static struct kmem_cache *isofs_inode_cachep; + +static struct inode *isofs_alloc_inode(struct super_block *sb) +{ + struct iso_inode_info *ei; + ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); + if (!ei) + return NULL; + return &ei->vfs_inode; +} + +static void isofs_i_callback(struct rcu_head *head) +{ + struct inode *inode = container_of(head, struct inode, i_rcu); + kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); +} + +static void isofs_destroy_inode(struct inode *inode) +{ + call_rcu(&inode->i_rcu, isofs_i_callback); +} + +static void init_once(void *foo) +{ + struct iso_inode_info *ei = foo; + + inode_init_once(&ei->vfs_inode); +} + +static int __init init_inodecache(void) +{ + isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", + sizeof(struct iso_inode_info), + 0, (SLAB_RECLAIM_ACCOUNT| + SLAB_MEM_SPREAD), + init_once); + if (isofs_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static void destroy_inodecache(void) +{ + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + kmem_cache_destroy(isofs_inode_cachep); +} + +static int isofs_remount(struct super_block *sb, int *flags, char *data) +{ + sync_filesystem(sb); + if (!(*flags & MS_RDONLY)) + return -EROFS; + return 0; +} + +static const struct super_operations isofs_sops = { + .alloc_inode = isofs_alloc_inode, + .destroy_inode = isofs_destroy_inode, + .put_super = isofs_put_super, + .statfs = isofs_statfs, + .remount_fs = isofs_remount, + .show_options = generic_show_options, +}; + + +static const struct dentry_operations isofs_dentry_ops[] = { + { + .d_hash = isofs_hashi, + .d_compare = isofs_dentry_cmpi, + }, +#ifdef CONFIG_JOLIET + { + .d_hash = isofs_hash_ms, + .d_compare = isofs_dentry_cmp_ms, + }, + { + .d_hash = isofs_hashi_ms, + .d_compare = isofs_dentry_cmpi_ms, + }, +#endif +}; + +struct iso9660_options{ + unsigned int rock:1; + unsigned int joliet:1; + unsigned int cruft:1; + unsigned int hide:1; + unsigned int showassoc:1; + unsigned int nocompress:1; + unsigned int overriderockperm:1; + unsigned int uid_set:1; + unsigned int gid_set:1; + unsigned int utf8:1; + unsigned char map; + unsigned char check; + unsigned int blocksize; + umode_t fmode; + umode_t dmode; + kgid_t gid; + kuid_t uid; + char *iocharset; + /* LVE */ + s32 session; + s32 sbsector; +}; + +/* + * Compute the hash for the isofs name corresponding to the dentry. + */ +static int +isofs_hashi_common(struct qstr *qstr, int ms) +{ + const char *name; + int len; + char c; + unsigned long hash; + + len = qstr->len; + name = qstr->name; + if (ms) { + while (len && name[len-1] == '.') + len--; + } + + hash = init_name_hash(); + while (len--) { + c = tolower(*name++); + hash = partial_name_hash(c, hash); + } + qstr->hash = end_name_hash(hash); + + return 0; +} + +/* + * Compare of two isofs names. + */ +static int isofs_dentry_cmp_common( + unsigned int len, const char *str, + const struct qstr *name, int ms, int ci) +{ + int alen, blen; + + /* A filename cannot end in '.' or we treat it like it has none */ + alen = name->len; + blen = len; + if (ms) { + while (alen && name->name[alen-1] == '.') + alen--; + while (blen && str[blen-1] == '.') + blen--; + } + if (alen == blen) { + if (ci) { + if (strncasecmp(name->name, str, alen) == 0) + return 0; + } else { + if (strncmp(name->name, str, alen) == 0) + return 0; + } + } + return 1; +} + +static int +isofs_hashi(const struct dentry *dentry, struct qstr *qstr) +{ + return isofs_hashi_common(qstr, 0); +} + +static int +isofs_dentry_cmpi(const struct dentry *parent, const struct dentry *dentry, + unsigned int len, const char *str, const struct qstr *name) +{ + return isofs_dentry_cmp_common(len, str, name, 0, 1); +} + +#ifdef CONFIG_JOLIET +/* + * Compute the hash for the isofs name corresponding to the dentry. + */ +static int +isofs_hash_common(struct qstr *qstr, int ms) +{ + const char *name; + int len; + + len = qstr->len; + name = qstr->name; + if (ms) { + while (len && name[len-1] == '.') + len--; + } + + qstr->hash = full_name_hash(name, len); + + return 0; +} + +static int +isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) +{ + return isofs_hash_common(qstr, 1); +} + +static int +isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) +{ + return isofs_hashi_common(qstr, 1); +} + +static int +isofs_dentry_cmp_ms(const struct dentry *parent, const struct dentry *dentry, + unsigned int len, const char *str, const struct qstr *name) +{ + return isofs_dentry_cmp_common(len, str, name, 1, 0); +} + +static int +isofs_dentry_cmpi_ms(const struct dentry *parent, const struct dentry *dentry, + unsigned int len, const char *str, const struct qstr *name) +{ + return isofs_dentry_cmp_common(len, str, name, 1, 1); +} +#endif + +enum { + Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, + Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, + Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, + Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, +}; + +static const match_table_t tokens = { + {Opt_norock, "norock"}, + {Opt_nojoliet, "nojoliet"}, + {Opt_unhide, "unhide"}, + {Opt_hide, "hide"}, + {Opt_showassoc, "showassoc"}, + {Opt_cruft, "cruft"}, + {Opt_utf8, "utf8"}, + {Opt_iocharset, "iocharset=%s"}, + {Opt_map_a, "map=acorn"}, + {Opt_map_a, "map=a"}, + {Opt_map_n, "map=normal"}, + {Opt_map_n, "map=n"}, + {Opt_map_o, "map=off"}, + {Opt_map_o, "map=o"}, + {Opt_session, "session=%u"}, + {Opt_sb, "sbsector=%u"}, + {Opt_check_r, "check=relaxed"}, + {Opt_check_r, "check=r"}, + {Opt_check_s, "check=strict"}, + {Opt_check_s, "check=s"}, + {Opt_uid, "uid=%u"}, + {Opt_gid, "gid=%u"}, + {Opt_mode, "mode=%u"}, + {Opt_dmode, "dmode=%u"}, + {Opt_overriderockperm, "overriderockperm"}, + {Opt_block, "block=%u"}, + {Opt_ignore, "conv=binary"}, + {Opt_ignore, "conv=b"}, + {Opt_ignore, "conv=text"}, + {Opt_ignore, "conv=t"}, + {Opt_ignore, "conv=mtext"}, + {Opt_ignore, "conv=m"}, + {Opt_ignore, "conv=auto"}, + {Opt_ignore, "conv=a"}, + {Opt_nocompress, "nocompress"}, + {Opt_err, NULL} +}; + +static int parse_options(char *options, struct iso9660_options *popt) +{ + char *p; + int option; + + popt->map = 'n'; + popt->rock = 1; + popt->joliet = 1; + popt->cruft = 0; + popt->hide = 0; + popt->showassoc = 0; + popt->check = 'u'; /* unset */ + popt->nocompress = 0; + popt->blocksize = 1024; + popt->fmode = popt->dmode = ISOFS_INVALID_MODE; + popt->uid_set = 0; + popt->gid_set = 0; + popt->gid = GLOBAL_ROOT_GID; + popt->uid = GLOBAL_ROOT_UID; + popt->iocharset = NULL; + popt->utf8 = 0; + popt->overriderockperm = 0; + popt->session=-1; + popt->sbsector=-1; + if (!options) + return 1; + + while ((p = strsep(&options, ",")) != NULL) { + int token; + substring_t args[MAX_OPT_ARGS]; + unsigned n; + + if (!*p) + continue; + + token = match_token(p, tokens, args); + switch (token) { + case Opt_norock: + popt->rock = 0; + break; + case Opt_nojoliet: + popt->joliet = 0; + break; + case Opt_hide: + popt->hide = 1; + break; + case Opt_unhide: + case Opt_showassoc: + popt->showassoc = 1; + break; + case Opt_cruft: + popt->cruft = 1; + break; + case Opt_utf8: + popt->utf8 = 1; + break; +#ifdef CONFIG_JOLIET + case Opt_iocharset: + popt->iocharset = match_strdup(&args[0]); + break; +#endif + case Opt_map_a: + popt->map = 'a'; + break; + case Opt_map_o: + popt->map = 'o'; + break; + case Opt_map_n: + popt->map = 'n'; + break; + case Opt_session: + if (match_int(&args[0], &option)) + return 0; + n = option; + if (n > 99) + return 0; + popt->session = n + 1; + break; + case Opt_sb: + if (match_int(&args[0], &option)) + return 0; + popt->sbsector = option; + break; + case Opt_check_r: + popt->check = 'r'; + break; + case Opt_check_s: + popt->check = 's'; + break; + case Opt_ignore: + break; + case Opt_uid: + if (match_int(&args[0], &option)) + return 0; + popt->uid = make_kuid(current_user_ns(), option); + if (!uid_valid(popt->uid)) + return 0; + popt->uid_set = 1; + break; + case Opt_gid: + if (match_int(&args[0], &option)) + return 0; + popt->gid = make_kgid(current_user_ns(), option); + if (!gid_valid(popt->gid)) + return 0; + popt->gid_set = 1; + break; + case Opt_mode: + if (match_int(&args[0], &option)) + return 0; + popt->fmode = option; + break; + case Opt_dmode: + if (match_int(&args[0], &option)) + return 0; + popt->dmode = option; + break; + case Opt_overriderockperm: + popt->overriderockperm = 1; + break; + case Opt_block: + if (match_int(&args[0], &option)) + return 0; + n = option; + if (n != 512 && n != 1024 && n != 2048) + return 0; + popt->blocksize = n; + break; + case Opt_nocompress: + popt->nocompress = 1; + break; + default: + return 0; + } + } + return 1; +} + +/* + * look if the driver can tell the multi session redirection value + * + * don't change this if you don't know what you do, please! + * Multisession is legal only with XA disks. + * A non-XA disk with more than one volume descriptor may do it right, but + * usually is written in a nowhere standardized "multi-partition" manner. + * Multisession uses absolute addressing (solely the first frame of the whole + * track is #0), multi-partition uses relative addressing (each first frame of + * each track is #0), and a track is not a session. + * + * A broken CDwriter software or drive firmware does not set new standards, + * at least not if conflicting with the existing ones. + * + * emoenke@gwdg.de + */ +#define WE_OBEY_THE_WRITTEN_STANDARDS 1 + +static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) +{ + struct cdrom_multisession ms_info; + unsigned int vol_desc_start; + struct block_device *bdev = sb->s_bdev; + int i; + + vol_desc_start=0; + ms_info.addr_format=CDROM_LBA; + if(session >= 0 && session <= 99) { + struct cdrom_tocentry Te; + Te.cdte_track=session; + Te.cdte_format=CDROM_LBA; + i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); + if (!i) { + printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", + session, Te.cdte_addr.lba, + Te.cdte_ctrl&CDROM_DATA_TRACK); + if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) + return Te.cdte_addr.lba; + } + + printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); + } + i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); + if (session > 0) + printk(KERN_ERR "ISOFS: Invalid session number\n"); +#if 0 + printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); + if (i==0) { + printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); + printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); + } +#endif + if (i==0) +#if WE_OBEY_THE_WRITTEN_STANDARDS + if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ +#endif + vol_desc_start=ms_info.addr.lba; + return vol_desc_start; +} + +/* + * Check if root directory is empty (has less than 3 files). + * + * Used to detect broken CDs where ISO root directory is empty but Joliet root + * directory is OK. If such CD has Rock Ridge extensions, they will be disabled + * (and Joliet used instead) or else no files would be visible. + */ +static bool rootdir_empty(struct super_block *sb, unsigned long block) +{ + int offset = 0, files = 0, de_len; + struct iso_directory_record *de; + struct buffer_head *bh; + + bh = sb_bread(sb, block); + if (!bh) + return true; + while (files < 3) { + de = (struct iso_directory_record *) (bh->b_data + offset); + de_len = *(unsigned char *) de; + if (de_len == 0) + break; + files++; + offset += de_len; + } + brelse(bh); + return files < 3; +} + +/* + * Initialize the superblock and read the root inode. + * + * Note: a check_disk_change() has been done immediately prior + * to this call, so we don't need to check again. + */ +static int isofs_fill_super(struct super_block *s, void *data, int silent) +{ + struct buffer_head *bh = NULL, *pri_bh = NULL; + struct hs_primary_descriptor *h_pri = NULL; + struct iso_primary_descriptor *pri = NULL; + struct iso_supplementary_descriptor *sec = NULL; + struct iso_directory_record *rootp; + struct inode *inode; + struct iso9660_options opt; + struct isofs_sb_info *sbi; + unsigned long first_data_zone; + int joliet_level = 0; + int iso_blknum, block; + int orig_zonesize; + int table, error = -EINVAL; + unsigned int vol_desc_start; + + save_mount_options(s, data); + + sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); + if (!sbi) + return -ENOMEM; + s->s_fs_info = sbi; + + if (!parse_options((char *)data, &opt)) + goto out_freesbi; + + /* + * First of all, get the hardware blocksize for this device. + * If we don't know what it is, or the hardware blocksize is + * larger than the blocksize the user specified, then use + * that value. + */ + /* + * What if bugger tells us to go beyond page size? + */ + opt.blocksize = sb_min_blocksize(s, opt.blocksize); + + sbi->s_high_sierra = 0; /* default is iso9660 */ + + vol_desc_start = (opt.sbsector != -1) ? + opt.sbsector : isofs_get_last_session(s,opt.session); + + for (iso_blknum = vol_desc_start+16; + iso_blknum < vol_desc_start+100; iso_blknum++) { + struct hs_volume_descriptor *hdp; + struct iso_volume_descriptor *vdp; + + block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); + if (!(bh = sb_bread(s, block))) + goto out_no_read; + + vdp = (struct iso_volume_descriptor *)bh->b_data; + hdp = (struct hs_volume_descriptor *)bh->b_data; + + /* + * Due to the overlapping physical location of the descriptors, + * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure + * proper identification in this case, we first check for ISO. + */ + if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { + if (isonum_711(vdp->type) == ISO_VD_END) + break; + if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { + if (pri == NULL) { + pri = (struct iso_primary_descriptor *)vdp; + /* Save the buffer in case we need it ... */ + pri_bh = bh; + bh = NULL; + } + } +#ifdef CONFIG_JOLIET + else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { + sec = (struct iso_supplementary_descriptor *)vdp; + if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { + if (opt.joliet) { + if (sec->escape[2] == 0x40) + joliet_level = 1; + else if (sec->escape[2] == 0x43) + joliet_level = 2; + else if (sec->escape[2] == 0x45) + joliet_level = 3; + + printk(KERN_DEBUG "ISO 9660 Extensions: " + "Microsoft Joliet Level %d\n", + joliet_level); + } + goto root_found; + } else { + /* Unknown supplementary volume descriptor */ + sec = NULL; + } + } +#endif + } else { + if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { + if (isonum_711(hdp->type) != ISO_VD_PRIMARY) + goto out_freebh; + + sbi->s_high_sierra = 1; + opt.rock = 0; + h_pri = (struct hs_primary_descriptor *)vdp; + goto root_found; + } + } + + /* Just skip any volume descriptors we don't recognize */ + + brelse(bh); + bh = NULL; + } + /* + * If we fall through, either no volume descriptor was found, + * or else we passed a primary descriptor looking for others. + */ + if (!pri) + goto out_unknown_format; + brelse(bh); + bh = pri_bh; + pri_bh = NULL; + +root_found: + + if (joliet_level && (pri == NULL || !opt.rock)) { + /* This is the case of Joliet with the norock mount flag. + * A disc with both Joliet and Rock Ridge is handled later + */ + pri = (struct iso_primary_descriptor *) sec; + } + + if(sbi->s_high_sierra){ + rootp = (struct iso_directory_record *) h_pri->root_directory_record; + sbi->s_nzones = isonum_733(h_pri->volume_space_size); + sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); + sbi->s_max_size = isonum_733(h_pri->volume_space_size); + } else { + if (!pri) + goto out_freebh; + rootp = (struct iso_directory_record *) pri->root_directory_record; + sbi->s_nzones = isonum_733(pri->volume_space_size); + sbi->s_log_zone_size = isonum_723(pri->logical_block_size); + sbi->s_max_size = isonum_733(pri->volume_space_size); + } + + sbi->s_ninodes = 0; /* No way to figure this out easily */ + + orig_zonesize = sbi->s_log_zone_size; + /* + * If the zone size is smaller than the hardware sector size, + * this is a fatal error. This would occur if the disc drive + * had sectors that were 2048 bytes, but the filesystem had + * blocks that were 512 bytes (which should only very rarely + * happen.) + */ + if (orig_zonesize < opt.blocksize) + goto out_bad_size; + + /* RDE: convert log zone size to bit shift */ + switch (sbi->s_log_zone_size) { + case 512: sbi->s_log_zone_size = 9; break; + case 1024: sbi->s_log_zone_size = 10; break; + case 2048: sbi->s_log_zone_size = 11; break; + + default: + goto out_bad_zone_size; + } + + s->s_magic = ISOFS_SUPER_MAGIC; + + /* + * With multi-extent files, file size is only limited by the maximum + * size of a file system, which is 8 TB. + */ + s->s_maxbytes = 0x80000000000LL; + + /* Set this for reference. Its not currently used except on write + which we don't have .. */ + + first_data_zone = isonum_733(rootp->extent) + + isonum_711(rootp->ext_attr_length); + sbi->s_firstdatazone = first_data_zone; +#ifndef BEQUIET + printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", + sbi->s_max_size, 1UL << sbi->s_log_zone_size); + printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); + if(sbi->s_high_sierra) + printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); +#endif + + /* + * If the Joliet level is set, we _may_ decide to use the + * secondary descriptor, but can't be sure until after we + * read the root inode. But before reading the root inode + * we may need to change the device blocksize, and would + * rather release the old buffer first. So, we cache the + * first_data_zone value from the secondary descriptor. + */ + if (joliet_level) { + pri = (struct iso_primary_descriptor *) sec; + rootp = (struct iso_directory_record *) + pri->root_directory_record; + first_data_zone = isonum_733(rootp->extent) + + isonum_711(rootp->ext_attr_length); + } + + /* + * We're all done using the volume descriptor, and may need + * to change the device blocksize, so release the buffer now. + */ + brelse(pri_bh); + brelse(bh); + + /* + * Force the blocksize to 512 for 512 byte sectors. The file + * read primitives really get it wrong in a bad way if we don't + * do this. + * + * Note - we should never be setting the blocksize to something + * less than the hardware sector size for the device. If we + * do, we would end up having to read larger buffers and split + * out portions to satisfy requests. + * + * Note2- the idea here is that we want to deal with the optimal + * zonesize in the filesystem. If we have it set to something less, + * then we have horrible problems with trying to piece together + * bits of adjacent blocks in order to properly read directory + * entries. By forcing the blocksize in this way, we ensure + * that we will never be required to do this. + */ + sb_set_blocksize(s, orig_zonesize); + + sbi->s_nls_iocharset = NULL; + +#ifdef CONFIG_JOLIET + if (joliet_level && opt.utf8 == 0) { + char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; + sbi->s_nls_iocharset = load_nls(p); + if (! sbi->s_nls_iocharset) { + /* Fail only if explicit charset specified */ + if (opt.iocharset) + goto out_freesbi; + sbi->s_nls_iocharset = load_nls_default(); + } + } +#endif + s->s_op = &isofs_sops; + s->s_export_op = &isofs_export_ops; + sbi->s_mapping = opt.map; + sbi->s_rock = (opt.rock ? 2 : 0); + sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ + sbi->s_cruft = opt.cruft; + sbi->s_hide = opt.hide; + sbi->s_showassoc = opt.showassoc; + sbi->s_uid = opt.uid; + sbi->s_gid = opt.gid; + sbi->s_uid_set = opt.uid_set; + sbi->s_gid_set = opt.gid_set; + sbi->s_utf8 = opt.utf8; + sbi->s_nocompress = opt.nocompress; + sbi->s_overriderockperm = opt.overriderockperm; + /* + * It would be incredibly stupid to allow people to mark every file + * on the disk as suid, so we merely allow them to set the default + * permissions. + */ + if (opt.fmode != ISOFS_INVALID_MODE) + sbi->s_fmode = opt.fmode & 0777; + else + sbi->s_fmode = ISOFS_INVALID_MODE; + if (opt.dmode != ISOFS_INVALID_MODE) + sbi->s_dmode = opt.dmode & 0777; + else + sbi->s_dmode = ISOFS_INVALID_MODE; + + /* + * Read the root inode, which _may_ result in changing + * the s_rock flag. Once we have the final s_rock value, + * we then decide whether to use the Joliet descriptor. + */ + inode = isofs_iget(s, sbi->s_firstdatazone, 0); + if (IS_ERR(inode)) + goto out_no_root; + + /* + * Fix for broken CDs with Rock Ridge and empty ISO root directory but + * correct Joliet root directory. + */ + if (sbi->s_rock == 1 && joliet_level && + rootdir_empty(s, sbi->s_firstdatazone)) { + printk(KERN_NOTICE + "ISOFS: primary root directory is empty. " + "Disabling Rock Ridge and switching to Joliet."); + sbi->s_rock = 0; + } + + /* + * If this disk has both Rock Ridge and Joliet on it, then we + * want to use Rock Ridge by default. This can be overridden + * by using the norock mount option. There is still one other + * possibility that is not taken into account: a Rock Ridge + * CD with Unicode names. Until someone sees such a beast, it + * will not be supported. + */ + if (sbi->s_rock == 1) { + joliet_level = 0; + } else if (joliet_level) { + sbi->s_rock = 0; + if (sbi->s_firstdatazone != first_data_zone) { + sbi->s_firstdatazone = first_data_zone; + printk(KERN_DEBUG + "ISOFS: changing to secondary root\n"); + iput(inode); + inode = isofs_iget(s, sbi->s_firstdatazone, 0); + if (IS_ERR(inode)) + goto out_no_root; + } + } + + if (opt.check == 'u') { + /* Only Joliet is case insensitive by default */ + if (joliet_level) + opt.check = 'r'; + else + opt.check = 's'; + } + sbi->s_joliet_level = joliet_level; + + /* Make sure the root inode is a directory */ + if (!S_ISDIR(inode->i_mode)) { + printk(KERN_WARNING + "isofs_fill_super: root inode is not a directory. " + "Corrupted media?\n"); + goto out_iput; + } + + table = 0; + if (joliet_level) + table += 2; + if (opt.check == 'r') + table++; + + if (table) + s->s_d_op = &isofs_dentry_ops[table - 1]; + + /* get the root dentry */ + s->s_root = d_make_root(inode); + if (!(s->s_root)) { + error = -ENOMEM; + goto out_no_inode; + } + + kfree(opt.iocharset); + + return 0; + + /* + * Display error messages and free resources. + */ +out_iput: + iput(inode); + goto out_no_inode; +out_no_root: + error = PTR_ERR(inode); + if (error != -ENOMEM) + printk(KERN_WARNING "%s: get root inode failed\n", __func__); +out_no_inode: +#ifdef CONFIG_JOLIET + unload_nls(sbi->s_nls_iocharset); +#endif + goto out_freesbi; +out_no_read: + printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", + __func__, s->s_id, iso_blknum, block); + goto out_freebh; +out_bad_zone_size: + printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", + sbi->s_log_zone_size); + goto out_freebh; +out_bad_size: + printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", + orig_zonesize, opt.blocksize); + goto out_freebh; +out_unknown_format: + if (!silent) + printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); + +out_freebh: + brelse(bh); + brelse(pri_bh); +out_freesbi: + kfree(opt.iocharset); + kfree(sbi); + s->s_fs_info = NULL; + return error; +} + +static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) +{ + struct super_block *sb = dentry->d_sb; + u64 id = huge_encode_dev(sb->s_bdev->bd_dev); + + buf->f_type = ISOFS_SUPER_MAGIC; + buf->f_bsize = sb->s_blocksize; + buf->f_blocks = (ISOFS_SB(sb)->s_nzones + << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); + buf->f_bfree = 0; + buf->f_bavail = 0; + buf->f_files = ISOFS_SB(sb)->s_ninodes; + buf->f_ffree = 0; + buf->f_fsid.val[0] = (u32)id; + buf->f_fsid.val[1] = (u32)(id >> 32); + buf->f_namelen = NAME_MAX; + return 0; +} + +/* + * Get a set of blocks; filling in buffer_heads if already allocated + * or getblk() if they are not. Returns the number of blocks inserted + * (-ve == error.) + */ +int isofs_get_blocks(struct inode *inode, sector_t iblock, + struct buffer_head **bh, unsigned long nblocks) +{ + unsigned long b_off = iblock; + unsigned offset, sect_size; + unsigned int firstext; + unsigned long nextblk, nextoff; + int section, rv, error; + struct iso_inode_info *ei = ISOFS_I(inode); + + error = -EIO; + rv = 0; + if (iblock != b_off) { + printk(KERN_DEBUG "%s: block number too large\n", __func__); + goto abort; + } + + + offset = 0; + firstext = ei->i_first_extent; + sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); + nextblk = ei->i_next_section_block; + nextoff = ei->i_next_section_offset; + section = 0; + + while (nblocks) { + /* If we are *way* beyond the end of the file, print a message. + * Access beyond the end of the file up to the next page boundary + * is normal, however because of the way the page cache works. + * In this case, we just return 0 so that we can properly fill + * the page with useless information without generating any + * I/O errors. + */ + if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { + printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", + __func__, b_off, + (unsigned long long)inode->i_size); + goto abort; + } + + /* On the last section, nextblk == 0, section size is likely to + * exceed sect_size by a partial block, and access beyond the + * end of the file will reach beyond the section size, too. + */ + while (nextblk && (b_off >= (offset + sect_size))) { + struct inode *ninode; + + offset += sect_size; + ninode = isofs_iget(inode->i_sb, nextblk, nextoff); + if (IS_ERR(ninode)) { + error = PTR_ERR(ninode); + goto abort; + } + firstext = ISOFS_I(ninode)->i_first_extent; + sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); + nextblk = ISOFS_I(ninode)->i_next_section_block; + nextoff = ISOFS_I(ninode)->i_next_section_offset; + iput(ninode); + + if (++section > 100) { + printk(KERN_DEBUG "%s: More than 100 file sections ?!?" + " aborting...\n", __func__); + printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " + "nextblk=%lu nextoff=%lu\n", __func__, + b_off, firstext, (unsigned) sect_size, + nextblk, nextoff); + goto abort; + } + } + + if (*bh) { + map_bh(*bh, inode->i_sb, firstext + b_off - offset); + } else { + *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); + if (!*bh) + goto abort; + } + bh++; /* Next buffer head */ + b_off++; /* Next buffer offset */ + nblocks--; + rv++; + } + + error = 0; +abort: + return rv != 0 ? rv : error; +} + +/* + * Used by the standard interfaces. + */ +static int isofs_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create) +{ + int ret; + + if (create) { + printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); + return -EROFS; + } + + ret = isofs_get_blocks(inode, iblock, &bh_result, 1); + return ret < 0 ? ret : 0; +} + +static int isofs_bmap(struct inode *inode, sector_t block) +{ + struct buffer_head dummy; + int error; + + dummy.b_state = 0; + dummy.b_blocknr = -1000; + error = isofs_get_block(inode, block, &dummy, 0); + if (!error) + return dummy.b_blocknr; + return 0; +} + +struct buffer_head *isofs_bread(struct inode *inode, sector_t block) +{ + sector_t blknr = isofs_bmap(inode, block); + if (!blknr) + return NULL; + return sb_bread(inode->i_sb, blknr); +} + +static int isofs_readpage(struct file *file, struct page *page) +{ + return mpage_readpage(page, isofs_get_block); +} + +static int isofs_readpages(struct file *file, struct address_space *mapping, + struct list_head *pages, unsigned nr_pages) +{ + return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); +} + +static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) +{ + return generic_block_bmap(mapping,block,isofs_get_block); +} + +static const struct address_space_operations isofs_aops = { + .readpage = isofs_readpage, + .readpages = isofs_readpages, + .bmap = _isofs_bmap +}; + +static int isofs_read_level3_size(struct inode *inode) +{ + unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); + int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; + struct buffer_head *bh = NULL; + unsigned long block, offset, block_saved, offset_saved; + int i = 0; + int more_entries = 0; + struct iso_directory_record *tmpde = NULL; + struct iso_inode_info *ei = ISOFS_I(inode); + + inode->i_size = 0; + + /* The first 16 blocks are reserved as the System Area. Thus, + * no inodes can appear in block 0. We use this to flag that + * this is the last section. */ + ei->i_next_section_block = 0; + ei->i_next_section_offset = 0; + + block = ei->i_iget5_block; + offset = ei->i_iget5_offset; + + do { + struct iso_directory_record *de; + unsigned int de_len; + + if (!bh) { + bh = sb_bread(inode->i_sb, block); + if (!bh) + goto out_noread; + } + de = (struct iso_directory_record *) (bh->b_data + offset); + de_len = *(unsigned char *) de; + + if (de_len == 0) { + brelse(bh); + bh = NULL; + ++block; + offset = 0; + continue; + } + + block_saved = block; + offset_saved = offset; + offset += de_len; + + /* Make sure we have a full directory entry */ + if (offset >= bufsize) { + int slop = bufsize - offset + de_len; + if (!tmpde) { + tmpde = kmalloc(256, GFP_KERNEL); + if (!tmpde) + goto out_nomem; + } + memcpy(tmpde, de, slop); + offset &= bufsize - 1; + block++; + brelse(bh); + bh = NULL; + if (offset) { + bh = sb_bread(inode->i_sb, block); + if (!bh) + goto out_noread; + memcpy((void *)tmpde+slop, bh->b_data, offset); + } + de = tmpde; + } + + inode->i_size += isonum_733(de->size); + if (i == 1) { + ei->i_next_section_block = block_saved; + ei->i_next_section_offset = offset_saved; + } + + more_entries = de->flags[-high_sierra] & 0x80; + + i++; + if (i > 100) + goto out_toomany; + } while (more_entries); +out: + kfree(tmpde); + if (bh) + brelse(bh); + return 0; + +out_nomem: + if (bh) + brelse(bh); + return -ENOMEM; + +out_noread: + printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); + kfree(tmpde); + return -EIO; + +out_toomany: + printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" + "isofs_read_level3_size: inode=%lu\n", + __func__, inode->i_ino); + goto out; +} + +static int isofs_read_inode(struct inode *inode, int relocated) +{ + struct super_block *sb = inode->i_sb; + struct isofs_sb_info *sbi = ISOFS_SB(sb); + unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); + unsigned long block; + int high_sierra = sbi->s_high_sierra; + struct buffer_head *bh = NULL; + struct iso_directory_record *de; + struct iso_directory_record *tmpde = NULL; + unsigned int de_len; + unsigned long offset; + struct iso_inode_info *ei = ISOFS_I(inode); + int ret = -EIO; + + block = ei->i_iget5_block; + bh = sb_bread(inode->i_sb, block); + if (!bh) + goto out_badread; + + offset = ei->i_iget5_offset; + + de = (struct iso_directory_record *) (bh->b_data + offset); + de_len = *(unsigned char *) de; + + if (offset + de_len > bufsize) { + int frag1 = bufsize - offset; + + tmpde = kmalloc(de_len, GFP_KERNEL); + if (tmpde == NULL) { + printk(KERN_INFO "%s: out of memory\n", __func__); + ret = -ENOMEM; + goto fail; + } + memcpy(tmpde, bh->b_data + offset, frag1); + brelse(bh); + bh = sb_bread(inode->i_sb, ++block); + if (!bh) + goto out_badread; + memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); + de = tmpde; + } + + inode->i_ino = isofs_get_ino(ei->i_iget5_block, + ei->i_iget5_offset, + ISOFS_BUFFER_BITS(inode)); + + /* Assume it is a normal-format file unless told otherwise */ + ei->i_file_format = isofs_file_normal; + + if (de->flags[-high_sierra] & 2) { + if (sbi->s_dmode != ISOFS_INVALID_MODE) + inode->i_mode = S_IFDIR | sbi->s_dmode; + else + inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; + set_nlink(inode, 1); /* + * Set to 1. We know there are 2, but + * the find utility tries to optimize + * if it is 2, and it screws up. It is + * easier to give 1 which tells find to + * do it the hard way. + */ + } else { + if (sbi->s_fmode != ISOFS_INVALID_MODE) { + inode->i_mode = S_IFREG | sbi->s_fmode; + } else { + /* + * Set default permissions: r-x for all. The disc + * could be shared with DOS machines so virtually + * anything could be a valid executable. + */ + inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; + } + set_nlink(inode, 1); + } + inode->i_uid = sbi->s_uid; + inode->i_gid = sbi->s_gid; + inode->i_blocks = 0; + + ei->i_format_parm[0] = 0; + ei->i_format_parm[1] = 0; + ei->i_format_parm[2] = 0; + + ei->i_section_size = isonum_733(de->size); + if (de->flags[-high_sierra] & 0x80) { + ret = isofs_read_level3_size(inode); + if (ret < 0) + goto fail; + ret = -EIO; + } else { + ei->i_next_section_block = 0; + ei->i_next_section_offset = 0; + inode->i_size = isonum_733(de->size); + } + + /* + * Some dipshit decided to store some other bit of information + * in the high byte of the file length. Truncate size in case + * this CDROM was mounted with the cruft option. + */ + + if (sbi->s_cruft) + inode->i_size &= 0x00ffffff; + + if (de->interleave[0]) { + printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); + inode->i_size = 0; + } + + /* I have no idea what file_unit_size is used for, so + we will flag it for now */ + if (de->file_unit_size[0] != 0) { + printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", + inode->i_ino); + } + + /* I have no idea what other flag bits are used for, so + we will flag it for now */ +#ifdef DEBUG + if((de->flags[-high_sierra] & ~2)!= 0){ + printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " + "(%ld %x).\n", + inode->i_ino, de->flags[-high_sierra]); + } +#endif + + inode->i_mtime.tv_sec = + inode->i_atime.tv_sec = + inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); + inode->i_mtime.tv_nsec = + inode->i_atime.tv_nsec = + inode->i_ctime.tv_nsec = 0; + + ei->i_first_extent = (isonum_733(de->extent) + + isonum_711(de->ext_attr_length)); + + /* Set the number of blocks for stat() - should be done before RR */ + inode->i_blocks = (inode->i_size + 511) >> 9; + + /* + * Now test for possible Rock Ridge extensions which will override + * some of these numbers in the inode structure. + */ + + if (!high_sierra) { + parse_rock_ridge_inode(de, inode, relocated); + /* if we want uid/gid set, override the rock ridge setting */ + if (sbi->s_uid_set) + inode->i_uid = sbi->s_uid; + if (sbi->s_gid_set) + inode->i_gid = sbi->s_gid; + } + /* Now set final access rights if overriding rock ridge setting */ + if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && + sbi->s_dmode != ISOFS_INVALID_MODE) + inode->i_mode = S_IFDIR | sbi->s_dmode; + if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && + sbi->s_fmode != ISOFS_INVALID_MODE) + inode->i_mode = S_IFREG | sbi->s_fmode; + + /* Install the inode operations vector */ + if (S_ISREG(inode->i_mode)) { + inode->i_fop = &generic_ro_fops; + switch (ei->i_file_format) { +#ifdef CONFIG_ZISOFS + case isofs_file_compressed: + inode->i_data.a_ops = &zisofs_aops; + break; +#endif + default: + inode->i_data.a_ops = &isofs_aops; + break; + } + } else if (S_ISDIR(inode->i_mode)) { + inode->i_op = &isofs_dir_inode_operations; + inode->i_fop = &isofs_dir_operations; + } else if (S_ISLNK(inode->i_mode)) { + inode->i_op = &page_symlink_inode_operations; + inode->i_data.a_ops = &isofs_symlink_aops; + } else + /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ + init_special_inode(inode, inode->i_mode, inode->i_rdev); + + ret = 0; +out: + kfree(tmpde); + if (bh) + brelse(bh); + return ret; + +out_badread: + printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); +fail: + goto out; +} + +struct isofs_iget5_callback_data { + unsigned long block; + unsigned long offset; +}; + +static int isofs_iget5_test(struct inode *ino, void *data) +{ + struct iso_inode_info *i = ISOFS_I(ino); + struct isofs_iget5_callback_data *d = + (struct isofs_iget5_callback_data*)data; + return (i->i_iget5_block == d->block) + && (i->i_iget5_offset == d->offset); +} + +static int isofs_iget5_set(struct inode *ino, void *data) +{ + struct iso_inode_info *i = ISOFS_I(ino); + struct isofs_iget5_callback_data *d = + (struct isofs_iget5_callback_data*)data; + i->i_iget5_block = d->block; + i->i_iget5_offset = d->offset; + return 0; +} + +/* Store, in the inode's containing structure, the block and block + * offset that point to the underlying meta-data for the inode. The + * code below is otherwise similar to the iget() code in + * include/linux/fs.h */ +struct inode *__isofs_iget(struct super_block *sb, + unsigned long block, + unsigned long offset, + int relocated) +{ + unsigned long hashval; + struct inode *inode; + struct isofs_iget5_callback_data data; + long ret; + + if (offset >= 1ul << sb->s_blocksize_bits) + return ERR_PTR(-EINVAL); + + data.block = block; + data.offset = offset; + + hashval = (block << sb->s_blocksize_bits) | offset; + + inode = iget5_locked(sb, hashval, &isofs_iget5_test, + &isofs_iget5_set, &data); + + if (!inode) + return ERR_PTR(-ENOMEM); + + if (inode->i_state & I_NEW) { + ret = isofs_read_inode(inode, relocated); + if (ret < 0) { + iget_failed(inode); + inode = ERR_PTR(ret); + } else { + unlock_new_inode(inode); + } + } + + return inode; +} + +static struct dentry *isofs_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + /* We don't support read-write mounts */ + if (!(flags & MS_RDONLY)) + return ERR_PTR(-EACCES); + return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); +} + +static struct file_system_type iso9660_fs_type = { + .owner = THIS_MODULE, + .name = "iso9660", + .mount = isofs_mount, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; +MODULE_ALIAS_FS("iso9660"); +MODULE_ALIAS("iso9660"); + +static int __init init_iso9660_fs(void) +{ + int err = init_inodecache(); + if (err) + goto out; +#ifdef CONFIG_ZISOFS + err = zisofs_init(); + if (err) + goto out1; +#endif + err = register_filesystem(&iso9660_fs_type); + if (err) + goto out2; + return 0; +out2: +#ifdef CONFIG_ZISOFS + zisofs_cleanup(); +out1: +#endif + destroy_inodecache(); +out: + return err; +} + +static void __exit exit_iso9660_fs(void) +{ + unregister_filesystem(&iso9660_fs_type); +#ifdef CONFIG_ZISOFS + zisofs_cleanup(); +#endif + destroy_inodecache(); +} + +module_init(init_iso9660_fs) +module_exit(exit_iso9660_fs) +MODULE_LICENSE("GPL"); |