mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1614 lines
40 KiB
1614 lines
40 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* 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/cred.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 <linux/seq_file.h> |
|
#include <linux/blkdev.h> |
|
|
|
#include "isofs.h" |
|
#include "zisofs.h" |
|
|
|
/* max tz offset is 13 hours */ |
|
#define MAX_TZ_OFFSET (52*15*60) |
|
|
|
#define BEQUIET |
|
|
|
static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); |
|
static int isofs_dentry_cmpi(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 *dentry, |
|
unsigned int len, const char *str, const struct qstr *name); |
|
static int isofs_dentry_cmp_ms(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 int isofs_show_options(struct seq_file *, struct dentry *); |
|
|
|
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_free_inode(struct inode *inode) |
|
{ |
|
kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); |
|
} |
|
|
|
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|SLAB_ACCOUNT), |
|
init_once); |
|
if (!isofs_inode_cachep) |
|
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 & SB_RDONLY)) |
|
return -EROFS; |
|
return 0; |
|
} |
|
|
|
static const struct super_operations isofs_sops = { |
|
.alloc_inode = isofs_alloc_inode, |
|
.free_inode = isofs_free_inode, |
|
.put_super = isofs_put_super, |
|
.statfs = isofs_statfs, |
|
.remount_fs = isofs_remount, |
|
.show_options = isofs_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(const struct dentry *dentry, 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(dentry); |
|
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(dentry, qstr, 0); |
|
} |
|
|
|
static int |
|
isofs_dentry_cmpi(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(const struct dentry *dentry, 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(dentry, name, len); |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) |
|
{ |
|
return isofs_hash_common(dentry, qstr, 1); |
|
} |
|
|
|
static int |
|
isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) |
|
{ |
|
return isofs_hashi_common(dentry, qstr, 1); |
|
} |
|
|
|
static int |
|
isofs_dentry_cmp_ms(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 *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; |
|
unsigned int uv; |
|
|
|
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: |
|
kfree(popt->iocharset); |
|
popt->iocharset = match_strdup(&args[0]); |
|
if (!popt->iocharset) |
|
return 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; |
|
/* |
|
* Track numbers are supposed to be in range 1-99, the |
|
* mount option starts indexing at 0. |
|
*/ |
|
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_uint(&args[0], &uv)) |
|
return 0; |
|
popt->uid = make_kuid(current_user_ns(), uv); |
|
if (!uid_valid(popt->uid)) |
|
return 0; |
|
popt->uid_set = 1; |
|
break; |
|
case Opt_gid: |
|
if (match_uint(&args[0], &uv)) |
|
return 0; |
|
popt->gid = make_kgid(current_user_ns(), uv); |
|
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; |
|
} |
|
|
|
/* |
|
* Display the mount options in /proc/mounts. |
|
*/ |
|
static int isofs_show_options(struct seq_file *m, struct dentry *root) |
|
{ |
|
struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); |
|
|
|
if (!sbi->s_rock) seq_puts(m, ",norock"); |
|
else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); |
|
if (sbi->s_cruft) seq_puts(m, ",cruft"); |
|
if (sbi->s_hide) seq_puts(m, ",hide"); |
|
if (sbi->s_nocompress) seq_puts(m, ",nocompress"); |
|
if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); |
|
if (sbi->s_showassoc) seq_puts(m, ",showassoc"); |
|
if (sbi->s_utf8) seq_puts(m, ",utf8"); |
|
|
|
if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); |
|
if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); |
|
if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); |
|
if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); |
|
|
|
if (root->d_sb->s_blocksize != 1024) |
|
seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); |
|
|
|
if (sbi->s_uid_set) |
|
seq_printf(m, ",uid=%u", |
|
from_kuid_munged(&init_user_ns, sbi->s_uid)); |
|
if (sbi->s_gid_set) |
|
seq_printf(m, ",gid=%u", |
|
from_kgid_munged(&init_user_ns, sbi->s_gid)); |
|
|
|
if (sbi->s_dmode != ISOFS_INVALID_MODE) |
|
seq_printf(m, ",dmode=%o", sbi->s_dmode); |
|
if (sbi->s_fmode != ISOFS_INVALID_MODE) |
|
seq_printf(m, ",fmode=%o", sbi->s_fmode); |
|
|
|
#ifdef CONFIG_JOLIET |
|
if (sbi->s_nls_iocharset && |
|
strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0) |
|
seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); |
|
#endif |
|
return 0; |
|
} |
|
|
|
/* |
|
* 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. |
|
* |
|
* [email protected] |
|
*/ |
|
#define WE_OBEY_THE_WRITTEN_STANDARDS 1 |
|
|
|
static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) |
|
{ |
|
struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); |
|
unsigned int vol_desc_start = 0; |
|
|
|
if (session > 0) { |
|
struct cdrom_tocentry te; |
|
|
|
if (!cdi) |
|
return 0; |
|
|
|
te.cdte_track = session; |
|
te.cdte_format = CDROM_LBA; |
|
if (cdrom_read_tocentry(cdi, &te) == 0) { |
|
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"); |
|
} |
|
|
|
if (cdi) { |
|
struct cdrom_multisession ms_info; |
|
|
|
ms_info.addr_format = CDROM_LBA; |
|
if (cdrom_multisession(cdi, &ms_info) == 0) { |
|
#if WE_OBEY_THE_WRITTEN_STANDARDS |
|
/* necessary for a valid ms_info.addr */ |
|
if (ms_info.xa_flag) |
|
#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. |
|
*/ |
|
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; |
|
|
|
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? |
|
*/ |
|
if (bdev_logical_block_size(s->s_bdev) > 2048) { |
|
printk(KERN_WARNING |
|
"ISOFS: unsupported/invalid hardware sector size %d\n", |
|
bdev_logical_block_size(s->s_bdev)); |
|
goto out_freesbi; |
|
} |
|
opt.blocksize = sb_min_blocksize(s, opt.blocksize); |
|
|
|
sbi->s_high_sierra = 0; /* default is iso9660 */ |
|
sbi->s_session = opt.session; |
|
sbi->s_sbsector = opt.sbsector; |
|
|
|
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) { |
|
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: |
|
/* We don't support read-write mounts */ |
|
if (!sb_rdonly(s)) { |
|
error = -EACCES; |
|
goto out_freebh; |
|
} |
|
|
|
if (joliet_level && (!pri || !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; |
|
|
|
/* ECMA-119 timestamp from 1900/1/1 with tz offset */ |
|
s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET; |
|
s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET; |
|
|
|
/* 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++; |
|
sbi->s_check = opt.check; |
|
|
|
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 = u64_to_fsid(id); |
|
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_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 void isofs_readahead(struct readahead_control *rac) |
|
{ |
|
mpage_readahead(rac, 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, |
|
.readahead = isofs_readahead, |
|
.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; |
|
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) { |
|
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_nohighmem(inode); |
|
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) |
|
{ |
|
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");
|
|
|