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ext4: Don't claim block from group which has corrupt bitmap

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In ext4_mb_complex_scan_group, if the extent length of the newly
found extentet is greater than than the total free blocks counted
in group info, break without claiming the block.

Document different ext4_error usage, explaining the state with which we
continue if we mount with errors=continue

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Aneesh Kumar K.V 2008-02-15 13:48:21 -05:00 committed by Theodore Ts'o
parent 9df5643ad1
commit e56eb65906
1 changed files with 15 additions and 1 deletions
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16
fs/ext4/mballoc.c
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@ -967,6 +967,10 @@ static void ext4_mb_generate_buddy(struct super_block *sb,
ext4_error(sb, __FUNCTION__,
"EXT4-fs: group %lu: %u blocks in bitmap, %u in gd\n",
group, free, grp->bb_free);
/*
* If we intent to continue, we consider group descritor
* corrupt and update bb_free using bitmap value
*/
grp->bb_free = free;
}
@ -1822,7 +1826,7 @@ static void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
EXT4_BLOCKS_PER_GROUP(sb), i);
if (i >= EXT4_BLOCKS_PER_GROUP(sb)) {
/*
* IF we corrupt the bitmap we won't find any
* IF we have corrupt bitmap, we won't find any
* free blocks even though group info says we
* we have free blocks
*/
@ -1838,6 +1842,12 @@ static void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
ext4_error(sb, __FUNCTION__, "%d free blocks as per "
"group info. But got %d blocks\n",
free, ex.fe_len);
/*
* The number of free blocks differs. This mostly
* indicate that the bitmap is corrupt. So exit
* without claiming the space.
*/
break;
}
ext4_mb_measure_extent(ac, &ex, e4b);
@ -3771,6 +3781,10 @@ static int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
(unsigned long) pa->pa_len);
ext4_error(sb, __FUNCTION__, "free %u, pa_free %u\n",
free, pa->pa_free);
/*
* pa is already deleted so we use the value obtained
* from the bitmap and continue.
*/
}
atomic_add(free, &sbi->s_mb_discarded);
if (ac)