Some disks do not contain VAT inode in the last recorded block as required
by the standard but a few blocks earlier (or the number of recorded blocks
is wrong). So look for the VAT inode a bit before the end of the media.
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/udf/super.c | 32 ++++++++++++++++++++++++--------
1 files changed, 24 insertions(+), 8 deletions(-)
I'm sending the patch for review in case someone is interested. I'm planning
to merge this fix with Linus soon...
diff --git a/fs/udf/super.c b/fs/udf/super.c
index 9d1b8c2..1e4543c 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1078,21 +1078,39 @@ static int udf_fill_partdesc_info(struct super_block *sb,
return 0;
}
-static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
+static void udf_find_vat_block(struct super_block *sb, int p_index,
+ int type1_index, sector_t start_block)
{
struct udf_sb_info *sbi = UDF_SB(sb);
struct udf_part_map *map = &sbi->s_partmaps[p_index];
+ sector_t vat_block;
struct kernel_lb_addr ino;
+
+ /*
+ * VAT file entry is in the last recorded block. Some broken disks have
+ * it a few blocks before so try a bit harder...
+ */
+ ino.partitionReferenceNum = type1_index;
+ for (vat_block = start_block;
+ vat_block >= map->s_partition_root &&
+ vat_block >= start_block - 3 &&
+ !sbi->s_vat_inode; vat_block--) {
+ ino.logicalBlockNum = vat_block - map->s_partition_root;
+ sbi->s_vat_inode = udf_iget(sb, &ino);
+ }
+}
+
+static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
+{
+ struct udf_sb_info *sbi = UDF_SB(sb);
+ struct udf_part_map *map = &sbi->s_partmaps[p_index];
struct buffer_head *bh = NULL;
struct udf_inode_info *vati;
uint32_t pos;
struct virtualAllocationTable20 *vat20;
sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
- /* VAT file entry is in the last recorded block */
- ino.partitionReferenceNum = type1_index;
- ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
- sbi->s_vat_inode = udf_iget(sb, &ino);
+ udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
if (!sbi->s_vat_inode &&
sbi->s_last_block != blocks - 1) {
printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the"
@@ -1100,9 +1118,7 @@ static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
"block of the device (%lu).\n",
(unsigned long)sbi->s_last_block,
(unsigned long)blocks - 1);
- ino.partitionReferenceNum = type1_index;
- ino.logicalBlockNum = blocks - 1 - map->s_partition_root;
- sbi->s_vat_inode = udf_iget(sb, &ino);
+ udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
}
if (!sbi->s_vat_inode)
return 1;
--
1.6.4.2
--
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