Initial import

1 files changed, 1557 insertions, 0 deletions

diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
new file mode 100644
index 000000000..d67a16f2a
--- /dev/null
+++ b/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");