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udf: Improve anchor block detection

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Add <last block>+1 and <last block>-1 to a list of blocks which can be the
real last recorded block on a UDF media. Sebastian Manciulea
<manciuleas@yahoo.com> claims this helps some drive + media combinations
he is able to test.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2008-04-07 16:15:04 +02:00
parent 423cf6dc04
commit 5fb28aa25a
1 changed files with 9 additions and 4 deletions
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13
fs/udf/super.c
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@ -709,14 +709,16 @@ static int udf_check_anchor_block(struct super_block *sb, sector_t block,
static sector_t udf_scan_anchors(struct super_block *sb, bool varconv, static sector_t udf_scan_anchors(struct super_block *sb, bool varconv,
sector_t lastblock) sector_t lastblock)
{ {
sector_t last[4]; sector_t last[6];
int i; int i;
struct udf_sb_info *sbi = UDF_SB(sb); struct udf_sb_info *sbi = UDF_SB(sb);
last[0] = lastblock; last[0] = lastblock;
last[1] = last[0] - 2; last[1] = last[0] - 1;
last[2] = last[0] - 150; last[2] = last[0] + 1;
last[3] = last[0] - 152; last[3] = last[0] - 2;
last[4] = last[0] - 150;
last[5] = last[0] - 152;
/* according to spec, anchor is in either: /* according to spec, anchor is in either:
* block 256 * block 256
@ -727,6 +729,9 @@ static sector_t udf_scan_anchors(struct super_block *sb, bool varconv,
for (i = 0; i < ARRAY_SIZE(last); i++) { for (i = 0; i < ARRAY_SIZE(last); i++) {
if (last[i] < 0) if (last[i] < 0)
continue; continue;
if (last[i] >= sb->s_bdev->bd_inode->i_size >>
sb->s_blocksize_bits)
continue;
if (udf_check_anchor_block(sb, last[i], varconv)) { if (udf_check_anchor_block(sb, last[i], varconv)) {
sbi->s_anchor[0] = last[i]; sbi->s_anchor[0] = last[i];