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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2008-02-15 19:48:21 +0100
committerTheodore Ts'o <tytso@mit.edu>2008-02-15 19:48:21 +0100
commite56eb6590693a5a340e8f596db2768a6e1b9e236 (patch)
tree0fccb796503d6296b36f343be70ad35c0fba2d7c /fs/ext4
parentext4: Get journal write access before modifying the extent tree (diff)
downloadlinux-e56eb6590693a5a340e8f596db2768a6e1b9e236.tar.xz
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ext4: Don't claim block from group which has corrupt bitmap
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>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/mballoc.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 2121184a3fa5..6968c53e62ad 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -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)