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-rw-r--r--fs/isofs/inode.c1557
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");
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-11 18:08:16 +0000