• Miao Xie's avatar
    Btrfs: fix corrupted metadata in the snapshot · 8407aa46
    Miao Xie authored
    When we delete a inode, we will remove all the delayed items including delayed
    inode update, and then truncate all the relative metadata. If there is lots of
    metadata, we will end the current transaction, and start a new transaction to
    truncate the left metadata. In this way, we will leave a inode item that its
    link counter is > 0, and also may leave some directory index items in fs/file tree
    after the current transaction ends. In other words, the metadata in this fs/file tree
    is inconsistent. If we create a snapshot for this tree now, we will find a inode with
    corrupted metadata in the new snapshot, and we won't continue to drop the left metadata,
    because its link counter is not 0.
    
    We fix this problem by updating the inode item before the current transaction ends.
    Signed-off-by: default avatarMiao Xie <miaox@cn.fujitsu.com>
    8407aa46
inode.c 207 KB