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[PATCH] ext3: Properly report backup block present in a group 

In filesystems with the meta block group flag on, ext3_bg_num_gdb() fails
to report the correct number of blocks used to store the group descriptor
backups in a given group.  It happens because meta_bg follows a different
logic from the original ext3 backup placement in groups multiples of 3, 5
and 7.

Signed-off-by: Glauber de Oliveira Costa <glommer@br.ibm.com>
Cc: Andreas Dilger <adilger@clusterfs.com>
Cc: "Stephen C. Tweedie" <sct@redhat.com>
Cc: Alex Tomas <alex@clusterfs.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Glauber de Oliveira Costa 2006-03-24 03:18:37 -08:00 committed by Linus Torvalds
parent d3561f78fd
commit b5a7c4f583
1 changed files with 33 additions and 7 deletions
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40
fs/ext3/balloc.c
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@ -1493,12 +1493,33 @@ static int ext3_group_sparse(int group)
*/
int ext3_bg_has_super(struct super_block *sb, int group)
{
if (EXT3_HAS_RO_COMPAT_FEATURE(sb,EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER)&&
!ext3_group_sparse(group))
if (EXT3_HAS_RO_COMPAT_FEATURE(sb,
EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER) &&
!ext3_group_sparse(group))
return 0;
return 1;
}
static unsigned long ext3_bg_num_gdb_meta(struct super_block *sb, int group)
{
unsigned long metagroup = group / EXT3_DESC_PER_BLOCK(sb);
unsigned long first = metagroup * EXT3_DESC_PER_BLOCK(sb);
unsigned long last = first + EXT3_DESC_PER_BLOCK(sb) - 1;
if (group == first || group == first + 1 || group == last)
return 1;
return 0;
}
static unsigned long ext3_bg_num_gdb_nometa(struct super_block *sb, int group)
{
if (EXT3_HAS_RO_COMPAT_FEATURE(sb,
EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER) &&
!ext3_group_sparse(group))
return 0;
return EXT3_SB(sb)->s_gdb_count;
}
/**
* ext3_bg_num_gdb - number of blocks used by the group table in group
* @sb: superblock for filesystem
@ -1510,9 +1531,14 @@ int ext3_bg_has_super(struct super_block *sb, int group)
*/
unsigned long ext3_bg_num_gdb(struct super_block *sb, int group)
{
if (EXT3_HAS_RO_COMPAT_FEATURE(sb,EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER)&&
!ext3_group_sparse(group))
return 0;
return EXT3_SB(sb)->s_gdb_count;
}
unsigned long first_meta_bg =
le32_to_cpu(EXT3_SB(sb)->s_es->s_first_meta_bg);
unsigned long metagroup = group / EXT3_DESC_PER_BLOCK(sb);
if (!EXT3_HAS_INCOMPAT_FEATURE(sb,EXT3_FEATURE_INCOMPAT_META_BG) ||
metagroup < first_meta_bg)
return ext3_bg_num_gdb_nometa(sb,group);
return ext3_bg_num_gdb_meta(sb,group);
}