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linux-next/fs/isofs/inode.c
Arnd Bergmann 4f819a7899 BKL: Remove BKL from isofs 
As in other file systems, we can replace the big kernel lock
with a private mutex in isofs. This means we can now access
multiple file systems concurrently, but it also means that
we serialize readdir and lookup across sleeping operations
which previously released the big kernel lock. This should
not matter though, as these operations are in practice
serialized through the hardware access.

The isofs_get_blocks functions now does not take any lock
any more, it used to recursively get the BKL. After looking
at the code for hours, I convinced myself that it was never
needed here anyway, because it only reads constant fields
of the inode and writes to a buffer head array that is
at this time only visible to the caller.

The get_sb and fill_super operations do not need the locking
at all because they operate on a file system that is either
about to be created or to be destroyed but in either case
is not visible to other threads.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2010-10-04 21:10:45 +02:00

1524 lines
38 KiB
C
Raw Blame History

/*
* 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 "isofs.h"
#include "zisofs.h"
#define BEQUIET
static int isofs_hashi(struct dentry *parent, struct qstr *qstr);
static int isofs_hash(struct dentry *parent, struct qstr *qstr);
static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b);
static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b);
#ifdef CONFIG_JOLIET
static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr);
static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr);
static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
#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 *);
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_destroy_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_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)
{
kmem_cache_destroy(isofs_inode_cachep);
}
static int isofs_remount(struct super_block *sb, int *flags, char *data)
{
/* we probably want a lot more here */
*flags |= MS_RDONLY;
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_hash,
.d_compare = isofs_dentry_cmp,
},
{
.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;
mode_t fmode;
mode_t dmode;
gid_t gid;
uid_t uid;
char *iocharset;
/* LVE */
s32 session;
s32 sbsector;
};
/*
* Compute the hash for the isofs name corresponding to the dentry.
*/
static int
isofs_hash_common(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(name, len);
return 0;
}
/*
* Compute the hash for the isofs name corresponding to the dentry.
*/
static int
isofs_hashi_common(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();
while (len--) {
c = tolower(*name++);
hash = partial_name_hash(c, hash);
}
qstr->hash = end_name_hash(hash);
return 0;
}
/*
* Case insensitive compare of two isofs names.
*/
static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
struct qstr *b, int ms)
{
int alen, blen;
/* A filename cannot end in '.' or we treat it like it has none */
alen = a->len;
blen = b->len;
if (ms) {
while (alen && a->name[alen-1] == '.')
alen--;
while (blen && b->name[blen-1] == '.')
blen--;
}
if (alen == blen) {
if (strnicmp(a->name, b->name, alen) == 0)
return 0;
}
return 1;
}
/*
* Case sensitive compare of two isofs names.
*/
static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
struct qstr *b, int ms)
{
int alen, blen;
/* A filename cannot end in '.' or we treat it like it has none */
alen = a->len;
blen = b->len;
if (ms) {
while (alen && a->name[alen-1] == '.')
alen--;
while (blen && b->name[blen-1] == '.')
blen--;
}
if (alen == blen) {
if (strncmp(a->name, b->name, alen) == 0)
return 0;
}
return 1;
}
static int
isofs_hash(struct dentry *dentry, struct qstr *qstr)
{
return isofs_hash_common(dentry, qstr, 0);
}
static int
isofs_hashi(struct dentry *dentry, struct qstr *qstr)
{
return isofs_hashi_common(dentry, qstr, 0);
}
static int
isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
{
return isofs_dentry_cmp_common(dentry, a, b, 0);
}
static int
isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
{
return isofs_dentry_cmpi_common(dentry, a, b, 0);
}
#ifdef CONFIG_JOLIET
static int
isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
{
return isofs_hash_common(dentry, qstr, 1);
}
static int
isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
{
return isofs_hashi_common(dentry, qstr, 1);
}
static int
isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
{
return isofs_dentry_cmp_common(dentry, a, b, 1);
}
static int
isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
{
return isofs_dentry_cmpi_common(dentry, a, b, 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 = 0;
popt->uid = 0;
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 = option;
popt->uid_set = 1;
break;
case Opt_gid:
if (match_int(&args[0], &option))
return 0;
popt->gid = option;
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;
}
/*
* 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;
/*
* The CDROM is read-only, has no nodes (devices) on it, and since
* all of the files appear to be owned by root, we really do not want
* to allow suid. (suid or devices will not show up unless we have
* Rock Ridge extensions)
*/
s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
/* 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;
mutex_init(&sbi->s_mutex);
/*
* 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;
/*
* 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;
}
/* get the root dentry */
s->s_root = d_alloc_root(inode);
if (!(s->s_root))
goto out_no_root;
table = 0;
if (joliet_level)
table += 2;
if (opt.check == 'r')
table++;
s->s_root->d_op = &isofs_dentry_ops[table];
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_freesbi;
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);
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_s,
struct buffer_head **bh, unsigned long nblocks)
{
unsigned long b_off;
unsigned offset, sect_size;
unsigned int firstext;
unsigned long nextblk, nextoff;
long iblock = (long)iblock_s;
int section, rv, error;
struct iso_inode_info *ei = ISOFS_I(inode);
error = -EIO;
rv = 0;
if (iblock < 0 || iblock != iblock_s) {
printk(KERN_DEBUG "%s: block number too large\n", __func__);
goto abort;
}
b_off = iblock;
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 (%ld, %ld)\n",
__func__, iblock, (unsigned 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=%ld firstext=%u sect_size=%u "
"nextblk=%lu nextoff=%lu\n", __func__,
iblock, 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 block_read_full_page(page,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,
.sync_page = block_sync_page,
.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)
{
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;
inode->i_nlink = 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;
}
inode->i_nlink = 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);
/* 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)
{
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);
if (ret < 0) {
iget_failed(inode);
inode = ERR_PTR(ret);
} else {
unlock_new_inode(inode);
}
}
return inode;
}
static int isofs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
mnt);
}
static struct file_system_type iso9660_fs_type = {
.owner = THIS_MODULE,
.name = "iso9660",
.get_sb = isofs_get_sb,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
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");
/* Actual filesystem name is iso9660, as requested in filesystems.c */
MODULE_ALIAS("iso9660");
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