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| author | Lukas Czerner <lczerner@redhat.com> | 2015-06-08 17:18:52 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2015-06-08 17:18:52 +0200 |
| commit | 41e5b7ed3e9597ccc46b6affc81872e6370936d9 (patch) | |
| tree | d431ec519ef7a3735a65cc69d4722693735e8799 /fs/ext4 | |
| parent | jbd2: revert must-not-fail allocation loops back to GFP_NOFAIL (diff) | |
| download | linux-41e5b7ed3e9597ccc46b6affc81872e6370936d9.tar.xz linux-41e5b7ed3e9597ccc46b6affc81872e6370936d9.zip | |
ext4: verify block bitmap even after fresh initialization
If we want to rely on the buffer_verified() flag of the block bitmap
buffer, we have to set it consistently. However currently if we're
initializing uninitialized block bitmap in
ext4_read_block_bitmap_nowait() we're not going to set buffer verified
at all.
We can do this by simply setting the flag on the buffer, but I think
it's actually better to run ext4_validate_block_bitmap() to make sure
that what we did in the ext4_init_block_bitmap() is right.
So run ext4_validate_block_bitmap() even after the block bitmap
initialization. Also bail out early from ext4_validate_block_bitmap() if
we see corrupt bitmap, since we already know it's corrupt and we do not
need to verify that.
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/balloc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index 955bf49a7945..cd6ea29be645 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -369,7 +369,7 @@ static void ext4_validate_block_bitmap(struct super_block *sb, struct ext4_group_info *grp = ext4_get_group_info(sb, block_group); struct ext4_sb_info *sbi = EXT4_SB(sb); - if (buffer_verified(bh)) + if (buffer_verified(bh) || EXT4_MB_GRP_BBITMAP_CORRUPT(grp)) return; ext4_lock_group(sb, block_group); @@ -446,7 +446,7 @@ ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group) unlock_buffer(bh); if (err) ext4_error(sb, "Checksum bad for grp %u", block_group); - return bh; + goto verify; } ext4_unlock_group(sb, block_group); if (buffer_uptodate(bh)) { |