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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>
This commit is contained in:
Lukas Czerner 2015-06-08 11:18:52 -04:00 committed by Theodore Ts'o
parent 6ccaf3e2f3
commit 41e5b7ed3e
1 changed files with 2 additions and 2 deletions
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4
fs/ext4/balloc.c
View File

@ -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)) {