aboutsummaryrefslogtreecommitdiff
path: root/fs/udf/super.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/udf/super.c')
-rw-r--r--fs/udf/super.c1934
1 files changed, 1934 insertions, 0 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c
new file mode 100644
index 000000000000..15bd4f24c5b7
--- /dev/null
+++ b/fs/udf/super.c
@@ -0,0 +1,1934 @@
+/*
+ * super.c
+ *
+ * PURPOSE
+ * Super block routines for the OSTA-UDF(tm) filesystem.
+ *
+ * DESCRIPTION
+ * OSTA-UDF(tm) = Optical Storage Technology Association
+ * Universal Disk Format.
+ *
+ * This code is based on version 2.00 of the UDF specification,
+ * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
+ * http://www.osta.org/
+ * http://www.ecma.ch/
+ * http://www.iso.org/
+ *
+ * CONTACTS
+ * E-mail regarding any portion of the Linux UDF file system should be
+ * directed to the development team mailing list (run by majordomo):
+ * linux_udf@hpesjro.fc.hp.com
+ *
+ * COPYRIGHT
+ * This file is distributed under the terms of the GNU General Public
+ * License (GPL). Copies of the GPL can be obtained from:
+ * ftp://prep.ai.mit.edu/pub/gnu/GPL
+ * Each contributing author retains all rights to their own work.
+ *
+ * (C) 1998 Dave Boynton
+ * (C) 1998-2004 Ben Fennema
+ * (C) 2000 Stelias Computing Inc
+ *
+ * HISTORY
+ *
+ * 09/24/98 dgb changed to allow compiling outside of kernel, and
+ * added some debugging.
+ * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34
+ * 10/16/98 attempting some multi-session support
+ * 10/17/98 added freespace count for "df"
+ * 11/11/98 gr added novrs option
+ * 11/26/98 dgb added fileset,anchor mount options
+ * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced vol descs
+ * rewrote option handling based on isofs
+ * 12/20/98 find the free space bitmap (if it exists)
+ */
+
+#include "udfdecl.h"
+
+#include <linux/config.h>
+#include <linux/blkdev.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/parser.h>
+#include <linux/stat.h>
+#include <linux/cdrom.h>
+#include <linux/nls.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+#include <linux/vfs.h>
+#include <linux/vmalloc.h>
+#include <asm/byteorder.h>
+
+#include <linux/udf_fs.h>
+#include "udf_sb.h"
+#include "udf_i.h"
+
+#include <linux/init.h>
+#include <asm/uaccess.h>
+
+#define VDS_POS_PRIMARY_VOL_DESC 0
+#define VDS_POS_UNALLOC_SPACE_DESC 1
+#define VDS_POS_LOGICAL_VOL_DESC 2
+#define VDS_POS_PARTITION_DESC 3
+#define VDS_POS_IMP_USE_VOL_DESC 4
+#define VDS_POS_VOL_DESC_PTR 5
+#define VDS_POS_TERMINATING_DESC 6
+#define VDS_POS_LENGTH 7
+
+static char error_buf[1024];
+
+/* These are the "meat" - everything else is stuffing */
+static int udf_fill_super(struct super_block *, void *, int);
+static void udf_put_super(struct super_block *);
+static void udf_write_super(struct super_block *);
+static int udf_remount_fs(struct super_block *, int *, char *);
+static int udf_check_valid(struct super_block *, int, int);
+static int udf_vrs(struct super_block *sb, int silent);
+static int udf_load_partition(struct super_block *, kernel_lb_addr *);
+static int udf_load_logicalvol(struct super_block *, struct buffer_head *, kernel_lb_addr *);
+static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
+static void udf_find_anchor(struct super_block *);
+static int udf_find_fileset(struct super_block *, kernel_lb_addr *, kernel_lb_addr *);
+static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
+static void udf_load_fileset(struct super_block *, struct buffer_head *, kernel_lb_addr *);
+static void udf_load_partdesc(struct super_block *, struct buffer_head *);
+static void udf_open_lvid(struct super_block *);
+static void udf_close_lvid(struct super_block *);
+static unsigned int udf_count_free(struct super_block *);
+static int udf_statfs(struct super_block *, struct kstatfs *);
+
+/* UDF filesystem type */
+static struct super_block *udf_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super);
+}
+
+static struct file_system_type udf_fstype = {
+ .owner = THIS_MODULE,
+ .name = "udf",
+ .get_sb = udf_get_sb,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+
+static kmem_cache_t * udf_inode_cachep;
+
+static struct inode *udf_alloc_inode(struct super_block *sb)
+{
+ struct udf_inode_info *ei;
+ ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep, SLAB_KERNEL);
+ if (!ei)
+ return NULL;
+ return &ei->vfs_inode;
+}
+
+static void udf_destroy_inode(struct inode *inode)
+{
+ kmem_cache_free(udf_inode_cachep, UDF_I(inode));
+}
+
+static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+{
+ struct udf_inode_info *ei = (struct udf_inode_info *) foo;
+
+ if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+ SLAB_CTOR_CONSTRUCTOR)
+ {
+ ei->i_ext.i_data = NULL;
+ inode_init_once(&ei->vfs_inode);
+ }
+}
+
+static int init_inodecache(void)
+{
+ udf_inode_cachep = kmem_cache_create("udf_inode_cache",
+ sizeof(struct udf_inode_info),
+ 0, SLAB_RECLAIM_ACCOUNT,
+ init_once, NULL);
+ if (udf_inode_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static void destroy_inodecache(void)
+{
+ if (kmem_cache_destroy(udf_inode_cachep))
+ printk(KERN_INFO "udf_inode_cache: not all structures were freed\n");
+}
+
+/* Superblock operations */
+static struct super_operations udf_sb_ops = {
+ .alloc_inode = udf_alloc_inode,
+ .destroy_inode = udf_destroy_inode,
+ .write_inode = udf_write_inode,
+ .delete_inode = udf_delete_inode,
+ .clear_inode = udf_clear_inode,
+ .put_super = udf_put_super,
+ .write_super = udf_write_super,
+ .statfs = udf_statfs,
+ .remount_fs = udf_remount_fs,
+};
+
+struct udf_options
+{
+ unsigned char novrs;
+ unsigned int blocksize;
+ unsigned int session;
+ unsigned int lastblock;
+ unsigned int anchor;
+ unsigned int volume;
+ unsigned short partition;
+ unsigned int fileset;
+ unsigned int rootdir;
+ unsigned int flags;
+ mode_t umask;
+ gid_t gid;
+ uid_t uid;
+ struct nls_table *nls_map;
+};
+
+static int __init init_udf_fs(void)
+{
+ int err;
+ err = init_inodecache();
+ if (err)
+ goto out1;
+ err = register_filesystem(&udf_fstype);
+ if (err)
+ goto out;
+ return 0;
+out:
+ destroy_inodecache();
+out1:
+ return err;
+}
+
+static void __exit exit_udf_fs(void)
+{
+ unregister_filesystem(&udf_fstype);
+ destroy_inodecache();
+}
+
+module_init(init_udf_fs)
+module_exit(exit_udf_fs)
+
+/*
+ * udf_parse_options
+ *
+ * PURPOSE
+ * Parse mount options.
+ *
+ * DESCRIPTION
+ * The following mount options are supported:
+ *
+ * gid= Set the default group.
+ * umask= Set the default umask.
+ * uid= Set the default user.
+ * bs= Set the block size.
+ * unhide Show otherwise hidden files.
+ * undelete Show deleted files in lists.
+ * adinicb Embed data in the inode (default)
+ * noadinicb Don't embed data in the inode
+ * shortad Use short ad's
+ * longad Use long ad's (default)
+ * nostrict Unset strict conformance
+ * iocharset= Set the NLS character set
+ *
+ * The remaining are for debugging and disaster recovery:
+ *
+ * novrs Skip volume sequence recognition
+ *
+ * The following expect a offset from 0.
+ *
+ * session= Set the CDROM session (default= last session)
+ * anchor= Override standard anchor location. (default= 256)
+ * volume= Override the VolumeDesc location. (unused)
+ * partition= Override the PartitionDesc location. (unused)
+ * lastblock= Set the last block of the filesystem/
+ *
+ * The following expect a offset from the partition root.
+ *
+ * fileset= Override the fileset block location. (unused)
+ * rootdir= Override the root directory location. (unused)
+ * WARNING: overriding the rootdir to a non-directory may
+ * yield highly unpredictable results.
+ *
+ * PRE-CONDITIONS
+ * options Pointer to mount options string.
+ * uopts Pointer to mount options variable.
+ *
+ * POST-CONDITIONS
+ * <return> 1 Mount options parsed okay.
+ * <return> 0 Error parsing mount options.
+ *
+ * HISTORY
+ * July 1, 1997 - Andrew E. Mileski
+ * Written, tested, and released.
+ */
+
+enum {
+ Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
+ Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
+ Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
+ Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
+ Opt_rootdir, Opt_utf8, Opt_iocharset,
+ Opt_err
+};
+
+static match_table_t tokens = {
+ {Opt_novrs, "novrs"},
+ {Opt_nostrict, "nostrict"},
+ {Opt_bs, "bs=%u"},
+ {Opt_unhide, "unhide"},
+ {Opt_undelete, "undelete"},
+ {Opt_noadinicb, "noadinicb"},
+ {Opt_adinicb, "adinicb"},
+ {Opt_shortad, "shortad"},
+ {Opt_longad, "longad"},
+ {Opt_gid, "gid=%u"},
+ {Opt_uid, "uid=%u"},
+ {Opt_umask, "umask=%o"},
+ {Opt_session, "session=%u"},
+ {Opt_lastblock, "lastblock=%u"},
+ {Opt_anchor, "anchor=%u"},
+ {Opt_volume, "volume=%u"},
+ {Opt_partition, "partition=%u"},
+ {Opt_fileset, "fileset=%u"},
+ {Opt_rootdir, "rootdir=%u"},
+ {Opt_utf8, "utf8"},
+ {Opt_iocharset, "iocharset=%s"},
+ {Opt_err, NULL}
+};
+
+static int
+udf_parse_options(char *options, struct udf_options *uopt)
+{
+ char *p;
+ int option;
+
+ uopt->novrs = 0;
+ uopt->blocksize = 2048;
+ uopt->partition = 0xFFFF;
+ uopt->session = 0xFFFFFFFF;
+ uopt->lastblock = 0;
+ uopt->anchor = 0;
+ uopt->volume = 0xFFFFFFFF;
+ uopt->rootdir = 0xFFFFFFFF;
+ uopt->fileset = 0xFFFFFFFF;
+ uopt->nls_map = NULL;
+
+ if (!options)
+ return 1;
+
+ while ((p = strsep(&options, ",")) != NULL)
+ {
+ substring_t args[MAX_OPT_ARGS];
+ int token;
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token)
+ {
+ case Opt_novrs:
+ uopt->novrs = 1;
+ case Opt_bs:
+ if (match_int(&args[0], &option))
+ return 0;
+ uopt->blocksize = option;
+ break;
+ case Opt_unhide:
+ uopt->flags |= (1 << UDF_FLAG_UNHIDE);
+ break;
+ case Opt_undelete:
+ uopt->flags |= (1 << UDF_FLAG_UNDELETE);
+ break;
+ case Opt_noadinicb:
+ uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
+ break;
+ case Opt_adinicb:
+ uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
+ break;
+ case Opt_shortad:
+ uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
+ break;
+ case Opt_longad:
+ uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
+ break;
+ case Opt_gid:
+ if (match_int(args, &option))
+ return 0;
+ uopt->gid = option;
+ break;
+ case Opt_uid:
+ if (match_int(args, &option))
+ return 0;
+ uopt->uid = option;
+ break;
+ case Opt_umask:
+ if (match_octal(args, &option))
+ return 0;
+ uopt->umask = option;
+ break;
+ case Opt_nostrict:
+ uopt->flags &= ~(1 << UDF_FLAG_STRICT);
+ break;
+ case Opt_session:
+ if (match_int(args, &option))
+ return 0;
+ uopt->session = option;
+ break;
+ case Opt_lastblock:
+ if (match_int(args, &option))
+ return 0;
+ uopt->lastblock = option;
+ break;
+ case Opt_anchor:
+ if (match_int(args, &option))
+ return 0;
+ uopt->anchor = option;
+ break;
+ case Opt_volume:
+ if (match_int(args, &option))
+ return 0;
+ uopt->volume = option;
+ break;
+ case Opt_partition:
+ if (match_int(args, &option))
+ return 0;
+ uopt->partition = option;
+ break;
+ case Opt_fileset:
+ if (match_int(args, &option))
+ return 0;
+ uopt->fileset = option;
+ break;
+ case Opt_rootdir:
+ if (match_int(args, &option))
+ return 0;
+ uopt->rootdir = option;
+ break;
+ case Opt_utf8:
+ uopt->flags |= (1 << UDF_FLAG_UTF8);
+ break;
+#ifdef CONFIG_UDF_NLS
+ case Opt_iocharset:
+ uopt->nls_map = load_nls(args[0].from);
+ uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
+ break;
+#endif
+ default:
+ printk(KERN_ERR "udf: bad mount option \"%s\" "
+ "or missing value\n", p);
+ return 0;
+ }
+ }
+ return 1;
+}
+
+void
+udf_write_super(struct super_block *sb)
+{
+ lock_kernel();
+ if (!(sb->s_flags & MS_RDONLY))
+ udf_open_lvid(sb);
+ sb->s_dirt = 0;
+ unlock_kernel();
+}
+
+static int
+udf_remount_fs(struct super_block *sb, int *flags, char *options)
+{
+ struct udf_options uopt;
+
+ uopt.flags = UDF_SB(sb)->s_flags ;
+ uopt.uid = UDF_SB(sb)->s_uid ;
+ uopt.gid = UDF_SB(sb)->s_gid ;
+ uopt.umask = UDF_SB(sb)->s_umask ;
+
+ if ( !udf_parse_options(options, &uopt) )
+ return -EINVAL;
+
+ UDF_SB(sb)->s_flags = uopt.flags;
+ UDF_SB(sb)->s_uid = uopt.uid;
+ UDF_SB(sb)->s_gid = uopt.gid;
+ UDF_SB(sb)->s_umask = uopt.umask;
+
+ if (UDF_SB_LVIDBH(sb)) {
+ int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
+ if (write_rev > UDF_MAX_WRITE_VERSION)
+ *flags |= MS_RDONLY;
+ }
+
+ if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+ return 0;
+ if (*flags & MS_RDONLY)
+ udf_close_lvid(sb);
+ else
+ udf_open_lvid(sb);
+
+ return 0;
+}
+
+/*
+ * udf_set_blocksize
+ *
+ * PURPOSE
+ * Set the block size to be used in all transfers.
+ *
+ * DESCRIPTION
+ * To allow room for a DMA transfer, it is best to guess big when unsure.
+ * This routine picks 2048 bytes as the blocksize when guessing. This
+ * should be adequate until devices with larger block sizes become common.
+ *
+ * Note that the Linux kernel can currently only deal with blocksizes of
+ * 512, 1024, 2048, 4096, and 8192 bytes.
+ *
+ * PRE-CONDITIONS
+ * sb Pointer to _locked_ superblock.
+ *
+ * POST-CONDITIONS
+ * sb->s_blocksize Blocksize.
+ * sb->s_blocksize_bits log2 of blocksize.
+ * <return> 0 Blocksize is valid.
+ * <return> 1 Blocksize is invalid.
+ *
+ * HISTORY
+ * July 1, 1997 - Andrew E. Mileski
+ * Written, tested, and released.
+ */
+static int
+udf_set_blocksize(struct super_block *sb, int bsize)
+{
+ if (!sb_min_blocksize(sb, bsize)) {
+ udf_debug("Bad block size (%d)\n", bsize);
+ printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
+ return 0;
+ }
+ return sb->s_blocksize;
+}
+
+static int
+udf_vrs(struct super_block *sb, int silent)
+{
+ struct volStructDesc *vsd = NULL;
+ int sector = 32768;
+ int sectorsize;
+ struct buffer_head *bh = NULL;
+ int iso9660=0;
+ int nsr02=0;
+ int nsr03=0;
+
+ /* Block size must be a multiple of 512 */
+ if (sb->s_blocksize & 511)
+ return 0;
+
+ if (sb->s_blocksize < sizeof(struct volStructDesc))
+ sectorsize = sizeof(struct volStructDesc);
+ else
+ sectorsize = sb->s_blocksize;
+
+ sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
+
+ udf_debug("Starting at sector %u (%ld byte sectors)\n",
+ (sector >> sb->s_blocksize_bits), sb->s_blocksize);
+ /* Process the sequence (if applicable) */
+ for (;!nsr02 && !nsr03; sector += sectorsize)
+ {
+ /* Read a block */
+ bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
+ if (!bh)
+ break;
+
+ /* Look for ISO descriptors */
+ vsd = (struct volStructDesc *)(bh->b_data +
+ (sector & (sb->s_blocksize - 1)));
+
+ if (vsd->stdIdent[0] == 0)
+ {
+ udf_release_data(bh);
+ break;
+ }
+ else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
+ {
+ iso9660 = sector;
+ switch (vsd->structType)
+ {
+ case 0:
+ udf_debug("ISO9660 Boot Record found\n");
+ break;
+ case 1:
+ udf_debug("ISO9660 Primary Volume Descriptor found\n");
+ break;
+ case 2:
+ udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
+ break;
+ case 3:
+ udf_debug("ISO9660 Volume Partition Descriptor found\n");
+ break;
+ case 255:
+ udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
+ break;
+ default:
+ udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
+ break;
+ }
+ }
+ else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
+ {
+ }
+ else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
+ {
+ udf_release_data(bh);
+ break;
+ }
+ else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
+ {
+ nsr02 = sector;
+ }
+ else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
+ {
+ nsr03 = sector;
+ }
+ udf_release_data(bh);
+ }
+
+ if (nsr03)
+ return nsr03;
+ else if (nsr02)
+ return nsr02;
+ else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
+ return -1;
+ else
+ return 0;
+}
+
+/*
+ * udf_find_anchor
+ *
+ * PURPOSE
+ * Find an anchor volume descriptor.
+ *
+ * PRE-CONDITIONS
+ * sb Pointer to _locked_ superblock.
+ * lastblock Last block on media.
+ *
+ * POST-CONDITIONS
+ * <return> 1 if not found, 0 if ok
+ *
+ * HISTORY
+ * July 1, 1997 - Andrew E. Mileski
+ * Written, tested, and released.
+ */
+static void
+udf_find_anchor(struct super_block *sb)
+{
+ int lastblock = UDF_SB_LASTBLOCK(sb);
+ struct buffer_head *bh = NULL;
+ uint16_t ident;
+ uint32_t location;
+ int i;
+
+ if (lastblock)
+ {
+ int varlastblock = udf_variable_to_fixed(lastblock);
+ int last[] = { lastblock, lastblock - 2,
+ lastblock - 150, lastblock - 152,
+ varlastblock, varlastblock - 2,
+ varlastblock - 150, varlastblock - 152 };
+
+ lastblock = 0;
+
+ /* Search for an anchor volume descriptor pointer */
+
+ /* according to spec, anchor is in either:
+ * block 256
+ * lastblock-256
+ * lastblock
+ * however, if the disc isn't closed, it could be 512 */
+
+ for (i=0; (!lastblock && i<sizeof(last)/sizeof(int)); i++)
+ {
+ if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
+ {
+ ident = location = 0;
+ }
+ else
+ {
+ ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
+ location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
+ udf_release_data(bh);
+ }
+
+ if (ident == TAG_IDENT_AVDP)
+ {
+ if (location == last[i] - UDF_SB_SESSION(sb))
+ {
+ lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
+ UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
+ }
+ else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
+ {
+ UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
+ lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
+ UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
+ }
+ else
+ udf_debug("Anchor found at block %d, location mismatch %d.\n",
+ last[i], location);
+ }
+ else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
+ {
+ lastblock = last[i];
+ UDF_SB_ANCHOR(sb)[3] = 512;
+ }
+ else
+ {
+ if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
+ {
+ ident = location = 0;
+ }
+ else
+ {
+ ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
+ location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
+ udf_release_data(bh);
+ }
+
+ if (ident == TAG_IDENT_AVDP &&
+ location == last[i] - 256 - UDF_SB_SESSION(sb))
+ {
+ lastblock = last[i];
+ UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
+ }
+ else
+ {
+ if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
+ {
+ ident = location = 0;
+ }
+ else
+ {
+ ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
+ location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
+ udf_release_data(bh);
+ }
+
+ if (ident == TAG_IDENT_AVDP &&
+ location == udf_variable_to_fixed(last[i]) - 256)
+ {
+ UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
+ lastblock = udf_variable_to_fixed(last[i]);
+ UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
+ }
+ }
+ }
+ }
+ }
+
+ if (!lastblock)
+ {
+ /* We havn't found the lastblock. check 312 */
+ if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
+ {
+ ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
+ location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
+ udf_release_data(bh);
+
+ if (ident == TAG_IDENT_AVDP && location == 256)
+ UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
+ }
+ }
+
+ for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
+ {
+ if (UDF_SB_ANCHOR(sb)[i])
+ {
+ if (!(bh = udf_read_tagged(sb,
+ UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
+ {
+ UDF_SB_ANCHOR(sb)[i] = 0;
+ }
+ else
+ {
+ udf_release_data(bh);
+ if ((ident != TAG_IDENT_AVDP) && (i ||
+ (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
+ {
+ UDF_SB_ANCHOR(sb)[i] = 0;
+ }
+ }
+ }
+ }
+
+ UDF_SB_LASTBLOCK(sb) = lastblock;
+}
+
+static int
+udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
+{
+ struct buffer_head *bh = NULL;
+ long lastblock;
+ uint16_t ident;
+
+ if (fileset->logicalBlockNum != 0xFFFFFFFF ||
+ fileset->partitionReferenceNum != 0xFFFF)
+ {
+ bh = udf_read_ptagged(sb, *fileset, 0, &ident);
+
+ if (!bh)
+ return 1;
+ else if (ident != TAG_IDENT_FSD)
+ {
+ udf_release_data(bh);
+ return 1;
+ }
+
+ }
+
+ if (!bh) /* Search backwards through the partitions */
+ {
+ kernel_lb_addr newfileset;
+
+ return 1;
+
+ for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
+ (newfileset.partitionReferenceNum != 0xFFFF &&
+ fileset->logicalBlockNum == 0xFFFFFFFF &&
+ fileset->partitionReferenceNum == 0xFFFF);
+ newfileset.partitionReferenceNum--)
+ {
+ lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
+ newfileset.logicalBlockNum = 0;
+
+ do
+ {
+ bh = udf_read_ptagged(sb, newfileset, 0, &ident);
+ if (!bh)
+ {
+ newfileset.logicalBlockNum ++;
+ continue;
+ }
+
+ switch (ident)
+ {
+ case TAG_IDENT_SBD:
+ {
+ struct spaceBitmapDesc *sp;
+ sp = (struct spaceBitmapDesc *)bh->b_data;
+ newfileset.logicalBlockNum += 1 +
+ ((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
+ >> sb->s_blocksize_bits);
+ udf_release_data(bh);
+ break;
+ }
+ case TAG_IDENT_FSD:
+ {
+ *fileset = newfileset;
+ break;
+ }
+ default:
+ {
+ newfileset.logicalBlockNum ++;
+ udf_release_data(bh);
+ bh = NULL;
+ break;
+ }
+ }
+ }
+ while (newfileset.logicalBlockNum < lastblock &&
+ fileset->logicalBlockNum == 0xFFFFFFFF &&
+ fileset->partitionReferenceNum == 0xFFFF);
+ }
+ }
+
+ if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
+ fileset->partitionReferenceNum != 0xFFFF) && bh)
+ {
+ udf_debug("Fileset at block=%d, partition=%d\n",
+ fileset->logicalBlockNum, fileset->partitionReferenceNum);
+
+ UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
+ udf_load_fileset(sb, bh, root);
+ udf_release_data(bh);
+ return 0;
+ }
+ return 1;
+}
+
+static void
+udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
+{
+ struct primaryVolDesc *pvoldesc;
+ time_t recording;
+ long recording_usec;
+ struct ustr instr;
+ struct ustr outstr;
+
+ pvoldesc = (struct primaryVolDesc *)bh->b_data;
+
+ if ( udf_stamp_to_time(&recording, &recording_usec,
+ lets_to_cpu(pvoldesc->recordingDateAndTime)) )
+ {
+ kernel_timestamp ts;
+ ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
+ udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
+ recording, recording_usec,
+ ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
+ UDF_SB_RECORDTIME(sb).tv_sec = recording;
+ UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
+ }
+
+ if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
+ {
+ if (udf_CS0toUTF8(&outstr, &instr))
+ {
+ strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
+ outstr.u_len > 31 ? 31 : outstr.u_len);
+ udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
+ }
+ }
+
+ if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
+ {
+ if (udf_CS0toUTF8(&outstr, &instr))
+ udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
+ }
+}
+
+static void
+udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
+{
+ struct fileSetDesc *fset;
+
+ fset = (struct fileSetDesc *)bh->b_data;
+
+ *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
+
+ UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
+
+ udf_debug("Rootdir at block=%d, partition=%d\n",
+ root->logicalBlockNum, root->partitionReferenceNum);
+}
+
+static void
+udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
+{
+ struct partitionDesc *p;
+ int i;
+
+ p = (struct partitionDesc *)bh->b_data;
+
+ for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
+ {
+ udf_debug("Searching map: (%d == %d)\n",
+ UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
+ if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
+ {
+ UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
+ UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
+ if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
+ UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
+ if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
+ UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
+ if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
+ UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
+ if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
+ UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
+
+ if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
+ !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
+ {
+ struct partitionHeaderDesc *phd;
+
+ phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
+ if (phd->unallocSpaceTable.extLength)
+ {
+ kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
+
+ UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
+ udf_iget(sb, loc);
+ UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
+ udf_debug("unallocSpaceTable (part %d) @ %ld\n",
+ i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
+ }
+ if (phd->unallocSpaceBitmap.extLength)
+ {
+ UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
+ if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
+ {
+ UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
+ le32_to_cpu(phd->unallocSpaceBitmap.extLength);
+ UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
+ le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
+ UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
+ udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
+ i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
+ }
+ }
+ if (phd->partitionIntegrityTable.extLength)
+ udf_debug("partitionIntegrityTable (part %d)\n", i);
+ if (phd->freedSpaceTable.extLength)
+ {
+ kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
+
+ UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
+ udf_iget(sb, loc);
+ UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
+ udf_debug("freedSpaceTable (part %d) @ %ld\n",
+ i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
+ }
+ if (phd->freedSpaceBitmap.extLength)
+ {
+ UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
+ if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
+ {
+ UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
+ le32_to_cpu(phd->freedSpaceBitmap.extLength);
+ UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
+ le32_to_cpu(phd->freedSpaceBitmap.extPosition);
+ UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
+ udf_debug("freedSpaceBitmap (part %d) @ %d\n",
+ i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
+ }
+ }
+ }
+ break;
+ }
+ }
+ if (i == UDF_SB_NUMPARTS(sb))
+ {
+ udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
+ }
+ else
+ {
+ udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
+ le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
+ UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
+ }
+}
+
+static int
+udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
+{
+ struct logicalVolDesc *lvd;
+ int i, j, offset;
+ uint8_t type;
+
+ lvd = (struct logicalVolDesc *)bh->b_data;
+
+ UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
+
+ for (i=0,offset=0;
+ i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
+ i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
+ {
+ type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
+ if (type == 1)
+ {
+ struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
+ UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
+ UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
+ UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
+ UDF_SB_PARTFUNC(sb,i) = NULL;
+ }
+ else if (type == 2)
+ {
+ struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
+ if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
+ {
+ if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
+ {
+ UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
+ UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
+ }
+ else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
+ {
+ UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
+ UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
+ }
+ }
+ else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
+ {
+ uint32_t loc;
+ uint16_t ident;
+ struct sparingTable *st;
+ struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
+
+ UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
+ UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
+ for (j=0; j<spm->numSparingTables; j++)
+ {
+ loc = le32_to_cpu(spm->locSparingTable[j]);
+ UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
+ udf_read_tagged(sb, loc, loc, &ident);
+ if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
+ {
+ st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
+ if (ident != 0 ||
+ strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
+ {
+ udf_release_data(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
+ UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
+ }
+ }
+ }
+ UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
+ }
+ else
+ {
+ udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
+ continue;
+ }
+ UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
+ UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
+ }
+ udf_debug("Partition (%d:%d) type %d on volume %d\n",
+ i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
+ }
+
+ if (fileset)
+ {
+ long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
+
+ *fileset = lelb_to_cpu(la->extLocation);
+ udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
+ fileset->logicalBlockNum,
+ fileset->partitionReferenceNum);
+ }
+ if (lvd->integritySeqExt.extLength)
+ udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
+ return 0;
+}
+
+/*
+ * udf_load_logicalvolint
+ *
+ */
+static void
+udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
+{
+ struct buffer_head *bh = NULL;
+ uint16_t ident;
+
+ while (loc.extLength > 0 &&
+ (bh = udf_read_tagged(sb, loc.extLocation,
+ loc.extLocation, &ident)) &&
+ ident == TAG_IDENT_LVID)
+ {
+ UDF_SB_LVIDBH(sb) = bh;
+
+ if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
+ udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
+
+ if (UDF_SB_LVIDBH(sb) != bh)
+ udf_release_data(bh);
+ loc.extLength -= sb->s_blocksize;
+ loc.extLocation ++;
+ }
+ if (UDF_SB_LVIDBH(sb) != bh)
+ udf_release_data(bh);
+}
+
+/*
+ * udf_process_sequence
+ *
+ * PURPOSE
+ * Process a main/reserve volume descriptor sequence.
+ *
+ * PRE-CONDITIONS
+ * sb Pointer to _locked_ superblock.
+ * block First block of first extent of the sequence.
+ * lastblock Lastblock of first extent of the sequence.
+ *
+ * HISTORY
+ * July 1, 1997 - Andrew E. Mileski
+ * Written, tested, and released.
+ */
+static int
+udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
+{
+ struct buffer_head *bh = NULL;
+ struct udf_vds_record vds[VDS_POS_LENGTH];
+ struct generic_desc *gd;
+ struct volDescPtr *vdp;
+ int done=0;
+ int i,j;
+ uint32_t vdsn;
+ uint16_t ident;
+ long next_s = 0, next_e = 0;
+
+ memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
+
+ /* Read the main descriptor sequence */
+ for (;(!done && block <= lastblock); block++)
+ {
+
+ bh = udf_read_tagged(sb, block, block, &ident);
+ if (!bh)
+ break;
+
+ /* Process each descriptor (ISO 13346 3/8.3-8.4) */
+ gd = (struct generic_desc *)bh->b_data;
+ vdsn = le32_to_cpu(gd->volDescSeqNum);
+ switch (ident)
+ {
+ case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
+ if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
+ {
+ vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
+ vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
+ }
+ break;
+ case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
+ if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
+ {
+ vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
+ vds[VDS_POS_VOL_DESC_PTR].block = block;
+
+ vdp = (struct volDescPtr *)bh->b_data;
+ next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
+ next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
+ next_e = next_e >> sb->s_blocksize_bits;
+ next_e += next_s;
+ }
+ break;
+ case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
+ if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
+ {
+ vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
+ vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
+ }
+ break;
+ case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
+ if (!vds[VDS_POS_PARTITION_DESC].block)
+ vds[VDS_POS_PARTITION_DESC].block = block;
+ break;
+ case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
+ if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
+ {
+ vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
+ vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
+ }
+ break;
+ case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
+ if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
+ {
+ vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
+ vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
+ }
+ break;
+ case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
+ vds[VDS_POS_TERMINATING_DESC].block = block;
+ if (next_e)
+ {
+ block = next_s;
+ lastblock = next_e;
+ next_s = next_e = 0;
+ }
+ else
+ done = 1;
+ break;
+ }
+ udf_release_data(bh);
+ }
+ for (i=0; i<VDS_POS_LENGTH; i++)
+ {
+ if (vds[i].block)
+ {
+ bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
+
+ if (i == VDS_POS_PRIMARY_VOL_DESC)
+ udf_load_pvoldesc(sb, bh);
+ else if (i == VDS_POS_LOGICAL_VOL_DESC)
+ udf_load_logicalvol(sb, bh, fileset);
+ else if (i == VDS_POS_PARTITION_DESC)
+ {
+ struct buffer_head *bh2 = NULL;
+ udf_load_partdesc(sb, bh);
+ for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
+ {
+ bh2 = udf_read_tagged(sb, j, j, &ident);
+ gd = (struct generic_desc *)bh2->b_data;
+ if (ident == TAG_IDENT_PD)
+ udf_load_partdesc(sb, bh2);
+ udf_release_data(bh2);
+ }
+ }
+ udf_release_data(bh);
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * udf_check_valid()
+ */
+static int
+udf_check_valid(struct super_block *sb, int novrs, int silent)
+{
+ long block;
+
+ if (novrs)
+ {
+ udf_debug("Validity check skipped because of novrs option\n");
+ return 0;
+ }
+ /* Check that it is NSR02 compliant */
+ /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
+ else if ((block = udf_vrs(sb, silent)) == -1)
+ {
+ udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
+ if (!UDF_SB_LASTBLOCK(sb))
+ UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
+ return 0;
+ }
+ else
+ return !block;
+}
+
+static int
+udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
+{
+ struct anchorVolDescPtr *anchor;
+ uint16_t ident;
+ struct buffer_head *bh;
+ long main_s, main_e, reserve_s, reserve_e;
+ int i, j;
+
+ if (!sb)
+ return 1;
+
+ for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
+ {
+ if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
+ UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
+ {
+ anchor = (struct anchorVolDescPtr *)bh->b_data;
+
+ /* Locate the main sequence */
+ main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
+ main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
+ main_e = main_e >> sb->s_blocksize_bits;
+ main_e += main_s;
+
+ /* Locate the reserve sequence */
+ reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
+ reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
+ reserve_e = reserve_e >> sb->s_blocksize_bits;
+ reserve_e += reserve_s;
+
+ udf_release_data(bh);
+
+ /* Process the main & reserve sequences */
+ /* responsible for finding the PartitionDesc(s) */
+ if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
+ udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
+ {
+ break;
+ }
+ }
+ }
+
+ if (i == sizeof(UDF_SB_ANCHOR(sb))/sizeof(int))
+ {
+ udf_debug("No Anchor block found\n");
+ return 1;
+ }
+ else
+ udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
+
+ for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
+ {
+ switch UDF_SB_PARTTYPE(sb, i)
+ {
+ case UDF_VIRTUAL_MAP15:
+ case UDF_VIRTUAL_MAP20:
+ {
+ kernel_lb_addr ino;
+
+ if (!UDF_SB_LASTBLOCK(sb))
+ {
+ UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
+ udf_find_anchor(sb);
+ }
+
+ if (!UDF_SB_LASTBLOCK(sb))
+ {
+ udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
+ return 1;
+ }
+
+ for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
+ {
+ if (j != i &&
+ UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
+ UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
+ {
+ ino.partitionReferenceNum = j;
+ ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
+ UDF_SB_PARTROOT(sb,j);
+ break;
+ }
+ }
+
+ if (j == UDF_SB_NUMPARTS(sb))
+ return 1;
+
+ if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
+ return 1;
+
+ if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
+ {
+ UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
+ UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
+ }
+ else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
+ {
+ struct buffer_head *bh = NULL;
+ uint32_t pos;
+
+ pos = udf_block_map(UDF_SB_VAT(sb), 0);
+ bh = sb_bread(sb, pos);
+ UDF_SB_TYPEVIRT(sb,i).s_start_offset =
+ le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
+ udf_ext0_offset(UDF_SB_VAT(sb));
+ UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
+ UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
+ udf_release_data(bh);
+ }
+ UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
+ UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
+ }
+ }
+ }
+ return 0;
+}
+
+static void udf_open_lvid(struct super_block *sb)
+{
+ if (UDF_SB_LVIDBH(sb))
+ {
+ int i;
+ kernel_timestamp cpu_time;
+
+ UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
+ UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
+ if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
+ UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
+ UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
+
+ UDF_SB_LVID(sb)->descTag.descCRC =
+ cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
+ le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
+
+ UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
+ for (i=0; i<16; i++)
+ if (i != 4)
+ UDF_SB_LVID(sb)->descTag.tagChecksum +=
+ ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
+
+ mark_buffer_dirty(UDF_SB_LVIDBH(sb));
+ }
+}
+
+static void udf_close_lvid(struct super_block *sb)
+{
+ if (UDF_SB_LVIDBH(sb) &&
+ UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
+ {
+ int i;
+ kernel_timestamp cpu_time;
+
+ UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
+ UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
+ if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
+ UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
+ if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
+ UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
+ if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
+ UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
+ if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
+ UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
+ UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
+
+ UDF_SB_LVID(sb)->descTag.descCRC =
+ cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
+ le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
+
+ UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
+ for (i=0; i<16; i++)
+ if (i != 4)
+ UDF_SB_LVID(sb)->descTag.tagChecksum +=
+ ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
+
+ mark_buffer_dirty(UDF_SB_LVIDBH(sb));
+ }
+}
+
+/*
+ * udf_read_super
+ *
+ * PURPOSE
+ * Complete the specified super block.
+ *
+ * PRE-CONDITIONS
+ * sb Pointer to superblock to complete - never NULL.
+ * sb->s_dev Device to read suberblock from.
+ * options Pointer to mount options.
+ * silent Silent flag.
+ *
+ * HISTORY
+ * July 1, 1997 - Andrew E. Mileski
+ * Written, tested, and released.
+ */
+static int udf_fill_super(struct super_block *sb, void *options, int silent)
+{
+ int i;
+ struct inode *inode=NULL;
+ struct udf_options uopt;
+ kernel_lb_addr rootdir, fileset;
+ struct udf_sb_info *sbi;
+
+ uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
+ uopt.uid = -1;
+ uopt.gid = -1;
+ uopt.umask = 0;
+
+ sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
+ if (!sbi)
+ return -ENOMEM;
+ sb->s_fs_info = sbi;
+ memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
+
+ init_MUTEX(&sbi->s_alloc_sem);
+
+ if (!udf_parse_options((char *)options, &uopt))
+ goto error_out;
+
+ if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
+ uopt.flags & (1 << UDF_FLAG_NLS_MAP))
+ {
+ udf_error(sb, "udf_read_super",
+ "utf8 cannot be combined with iocharset\n");
+ goto error_out;
+ }
+#ifdef CONFIG_UDF_NLS
+ if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
+ {
+ uopt.nls_map = load_nls_default();
+ if (!uopt.nls_map)
+ uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
+ else
+ udf_debug("Using default NLS map\n");
+ }
+#endif
+ if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
+ uopt.flags |= (1 << UDF_FLAG_UTF8);
+
+ fileset.logicalBlockNum = 0xFFFFFFFF;
+ fileset.partitionReferenceNum = 0xFFFF;
+
+ UDF_SB(sb)->s_flags = uopt.flags;
+ UDF_SB(sb)->s_uid = uopt.uid;
+ UDF_SB(sb)->s_gid = uopt.gid;
+ UDF_SB(sb)->s_umask = uopt.umask;
+ UDF_SB(sb)->s_nls_map = uopt.nls_map;
+
+ /* Set the block size for all transfers */
+ if (!udf_set_blocksize(sb, uopt.blocksize))
+ goto error_out;
+
+ if ( uopt.session == 0xFFFFFFFF )
+ UDF_SB_SESSION(sb) = udf_get_last_session(sb);
+ else
+ UDF_SB_SESSION(sb) = uopt.session;
+
+ udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
+
+ UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
+ UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
+ UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
+ UDF_SB_ANCHOR(sb)[3] = 256;
+
+ if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
+ {
+ printk("UDF-fs: No VRS found\n");
+ goto error_out;
+ }
+
+ udf_find_anchor(sb);
+
+ /* Fill in the rest of the superblock */
+ sb->s_op = &udf_sb_ops;
+ sb->dq_op = NULL;
+ sb->s_dirt = 0;
+ sb->s_magic = UDF_SUPER_MAGIC;
+ sb->s_time_gran = 1000;
+
+ if (udf_load_partition(sb, &fileset))
+ {
+ printk("UDF-fs: No partition found (1)\n");
+ goto error_out;
+ }
+
+ udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
+
+ if ( UDF_SB_LVIDBH(sb) )
+ {
+ uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
+ uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
+ /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
+
+ if (minUDFReadRev > UDF_MAX_READ_VERSION)
+ {
+ printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
+ le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
+ UDF_MAX_READ_VERSION);
+ goto error_out;
+ }
+ else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
+ {
+ sb->s_flags |= MS_RDONLY;
+ }
+
+ UDF_SB_UDFREV(sb) = minUDFWriteRev;
+
+ if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
+ UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
+ if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
+ UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
+ }
+
+ if ( !UDF_SB_NUMPARTS(sb) )
+ {
+ printk("UDF-fs: No partition found (2)\n");
+ goto error_out;
+ }
+
+ if ( udf_find_fileset(sb, &fileset, &rootdir) )
+ {
+ printk("UDF-fs: No fileset found\n");
+ goto error_out;
+ }
+
+ if (!silent)
+ {
+ kernel_timestamp ts;
+ udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
+ udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
+ UDFFS_VERSION, UDFFS_DATE,
+ UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
+ ts.typeAndTimezone);
+ }
+ if (!(sb->s_flags & MS_RDONLY))
+ udf_open_lvid(sb);
+
+ /* Assign the root inode */
+ /* assign inodes by physical block number */
+ /* perhaps it's not extensible enough, but for now ... */
+ inode = udf_iget(sb, rootdir);
+ if (!inode)
+ {
+ printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
+ rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
+ goto error_out;
+ }
+
+ /* Allocate a dentry for the root inode */
+ sb->s_root = d_alloc_root(inode);
+ if (!sb->s_root)
+ {
+ printk("UDF-fs: Couldn't allocate root dentry\n");
+ iput(inode);
+ goto error_out;
+ }
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ return 0;
+
+error_out:
+ if (UDF_SB_VAT(sb))
+ iput(UDF_SB_VAT(sb));
+ if (UDF_SB_NUMPARTS(sb))
+ {
+ if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
+ iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
+ if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
+ iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
+ if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
+ UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
+ if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
+ UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
+ if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
+ {
+ for (i=0; i<4; i++)
+ udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
+ }
+ }
+#ifdef CONFIG_UDF_NLS
+ if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
+ unload_nls(UDF_SB(sb)->s_nls_map);
+#endif
+ if (!(sb->s_flags & MS_RDONLY))
+ udf_close_lvid(sb);
+ udf_release_data(UDF_SB_LVIDBH(sb));
+ UDF_SB_FREE(sb);
+ kfree(sbi);
+ sb->s_fs_info = NULL;
+ return -EINVAL;
+}
+
+void udf_error(struct super_block *sb, const char *function,
+ const char *fmt, ...)
+{
+ va_list args;
+
+ if (!(sb->s_flags & MS_RDONLY))
+ {
+ /* mark sb error */
+ sb->s_dirt = 1;
+ }
+ va_start(args, fmt);
+ vsprintf(error_buf, fmt, args);
+ va_end(args);
+ printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
+ sb->s_id, function, error_buf);
+}
+
+void udf_warning(struct super_block *sb, const char *function,
+ const char *fmt, ...)
+{
+ va_list args;
+
+ va_start (args, fmt);
+ vsprintf(error_buf, fmt, args);
+ va_end(args);
+ printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
+ sb->s_id, function, error_buf);
+}
+
+/*
+ * udf_put_super
+ *
+ * PURPOSE
+ * Prepare for destruction of the superblock.
+ *
+ * DESCRIPTION
+ * Called before the filesystem is unmounted.
+ *
+ * HISTORY
+ * July 1, 1997 - Andrew E. Mileski
+ * Written, tested, and released.
+ */
+static void
+udf_put_super(struct super_block *sb)
+{
+ int i;
+
+ if (UDF_SB_VAT(sb))
+ iput(UDF_SB_VAT(sb));
+ if (UDF_SB_NUMPARTS(sb))
+ {
+ if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
+ iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
+ if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
+ iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
+ if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
+ UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
+ if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
+ UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
+ if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
+ {
+ for (i=0; i<4; i++)
+ udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
+ }
+ }
+#ifdef CONFIG_UDF_NLS
+ if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
+ unload_nls(UDF_SB(sb)->s_nls_map);
+#endif
+ if (!(sb->s_flags & MS_RDONLY))
+ udf_close_lvid(sb);
+ udf_release_data(UDF_SB_LVIDBH(sb));
+ UDF_SB_FREE(sb);
+ kfree(sb->s_fs_info);
+ sb->s_fs_info = NULL;
+}
+
+/*
+ * udf_stat_fs
+ *
+ * PURPOSE
+ * Return info about the filesystem.
+ *
+ * DESCRIPTION
+ * Called by sys_statfs()
+ *
+ * HISTORY
+ * July 1, 1997 - Andrew E. Mileski
+ * Written, tested, and released.
+ */
+static int
+udf_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+ buf->f_type = UDF_SUPER_MAGIC;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
+ buf->f_bfree = udf_count_free(sb);
+ buf->f_bavail = buf->f_bfree;
+ buf->f_files = (UDF_SB_LVIDBH(sb) ?
+ (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
+ le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
+ buf->f_ffree = buf->f_bfree;
+ /* __kernel_fsid_t f_fsid */
+ buf->f_namelen = UDF_NAME_LEN-2;
+
+ return 0;
+}
+
+static unsigned char udf_bitmap_lookup[16] = {
+ 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
+};
+
+static unsigned int
+udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
+{
+ struct buffer_head *bh = NULL;
+ unsigned int accum = 0;
+ int index;
+ int block = 0, newblock;
+ kernel_lb_addr loc;
+ uint32_t bytes;
+ uint8_t value;
+ uint8_t *ptr;
+ uint16_t ident;
+ struct spaceBitmapDesc *bm;
+
+ lock_kernel();
+
+ loc.logicalBlockNum = bitmap->s_extPosition;
+ loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
+ bh = udf_read_ptagged(sb, loc, 0, &ident);
+
+ if (!bh)
+ {
+ printk(KERN_ERR "udf: udf_count_free failed\n");
+ goto out;
+ }
+ else if (ident != TAG_IDENT_SBD)
+ {
+ udf_release_data(bh);
+ printk(KERN_ERR "udf: udf_count_free failed\n");
+ goto out;
+ }
+
+ bm = (struct spaceBitmapDesc *)bh->b_data;
+ bytes = le32_to_cpu(bm->numOfBytes);
+ index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
+ ptr = (uint8_t *)bh->b_data;
+
+ while ( bytes > 0 )
+ {
+ while ((bytes > 0) && (index < sb->s_blocksize))
+ {
+ value = ptr[index];
+ accum += udf_bitmap_lookup[ value & 0x0f ];
+ accum += udf_bitmap_lookup[ value >> 4 ];
+ index++;
+ bytes--;
+ }
+ if ( bytes )
+ {
+ udf_release_data(bh);
+ newblock = udf_get_lb_pblock(sb, loc, ++block);
+ bh = udf_tread(sb, newblock);
+ if (!bh)
+ {
+ udf_debug("read failed\n");
+ goto out;
+ }
+ index = 0;
+ ptr = (uint8_t *)bh->b_data;
+ }
+ }
+ udf_release_data(bh);
+
+out:
+ unlock_kernel();
+
+ return accum;
+}
+
+static unsigned int
+udf_count_free_table(struct super_block *sb, struct inode * table)
+{
+ unsigned int accum = 0;
+ uint32_t extoffset, elen;
+ kernel_lb_addr bloc, eloc;
+ int8_t etype;
+ struct buffer_head *bh = NULL;
+
+ lock_kernel();
+
+ bloc = UDF_I_LOCATION(table);
+ extoffset = sizeof(struct unallocSpaceEntry);
+
+ while ((etype = udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
+ {
+ accum += (elen >> table->i_sb->s_blocksize_bits);
+ }
+ udf_release_data(bh);
+
+ unlock_kernel();
+
+ return accum;
+}
+
+static unsigned int
+udf_count_free(struct super_block *sb)
+{
+ unsigned int accum = 0;
+
+ if (UDF_SB_LVIDBH(sb))
+ {
+ if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
+ {
+ accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
+
+ if (accum == 0xFFFFFFFF)
+ accum = 0;
+ }
+ }
+
+ if (accum)
+ return accum;
+
+ if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
+ {
+ accum += udf_count_free_bitmap(sb,
+ UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
+ }
+ if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
+ {
+ accum += udf_count_free_bitmap(sb,
+ UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
+ }
+ if (accum)
+ return accum;
+
+ if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
+ {
+ accum += udf_count_free_table(sb,
+ UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
+ }
+ if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
+ {
+ accum += udf_count_free_table(sb,
+ UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
+ }
+
+ return accum;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-27 04:50:05 +0000