• Josef Bacik's avatar
    Btrfs: place ordered operations on a per transaction list · 569e0f35
    Josef Bacik authored
    Miao made the ordered operations stuff run async, which introduced a
    deadlock where we could get somebody (sync) racing in and committing the
    transaction while a commit was already happening.  The new committer would
    try and flush ordered operations which would hang waiting for the commit to
    finish because it is done asynchronously and no longer inherits the callers
    trans handle.  To fix this we need to make the ordered operations list a per
    transaction list.  We can get new inodes added to the ordered operation list
    by truncating them and then having another process writing to them, so this
    makes it so that anybody trying to add an ordered operation _must_ start a
    transaction in order to add itself to the list, which will keep new inodes
    from getting added to the ordered operations list after we start committing.
    This should fix the deadlock and also keeps us from doing a lot more work
    than we need to during commit.  Thanks,
    Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
    569e0f35
disk-io.c 106 KB