diff options
| author | Darrick J. Wong <darrick.wong@oracle.com> | 2013-08-29 02:46:56 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-08-29 02:46:56 +0400 |
| commit | bdfb6ff4a255dcebeb09a901250e13a97eff75af (patch) | |
| tree | ae320a717aea5bf4f40d6e87816322ac7a79f3fb /fs/ext4/ialloc.c | |
| parent | 87a39389be3e3b007d341be510a7e4a0542bdf05 (diff) | |
| download | linux-bdfb6ff4a255dcebeb09a901250e13a97eff75af.tar.xz | |
ext4: mark group corrupt on group descriptor checksum
If the group descriptor fails validation, mark the whole blockgroup
corrupt so that the inode/block allocators skip this group. The
previous approach takes the risk of writing to a damaged group
descriptor; hopefully it was never the case that the [ib]bitmap fields
pointed to another valid block and got dirtied, since the memset would
fill the page with 1s.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ialloc.c')
| -rw-r--r-- | fs/ext4/ialloc.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index d5106078595e..137193ff389b 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -70,18 +70,16 @@ static unsigned ext4_init_inode_bitmap(struct super_block *sb, ext4_group_t block_group, struct ext4_group_desc *gdp) { + struct ext4_group_info *grp; J_ASSERT_BH(bh, buffer_locked(bh)); /* If checksum is bad mark all blocks and inodes use to prevent * allocation, essentially implementing a per-group read-only flag. */ if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) { ext4_error(sb, "Checksum bad for group %u", block_group); - ext4_free_group_clusters_set(sb, gdp, 0); - ext4_free_inodes_set(sb, gdp, 0); - ext4_itable_unused_set(sb, gdp, 0); - memset(bh->b_data, 0xff, sb->s_blocksize); - ext4_inode_bitmap_csum_set(sb, block_group, gdp, bh, - EXT4_INODES_PER_GROUP(sb) / 8); + grp = ext4_get_group_info(sb, block_group); + set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state); + set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state); return 0; } |