• Josef Bacik's avatar
    Btrfs: only do the tree_mod_log_free_eb if this is our last ref · 7fb7d76f
    Josef Bacik authored
    There is another bug in the tree mod log stuff in that we're calling
    tree_mod_log_free_eb every single time a block is cow'ed.  The problem with this
    is that if this block is shared by multiple snapshots we will call this multiple
    times per block, so if we go to rewind the mod log for this block we'll BUG_ON()
    in __tree_mod_log_rewind because we try to rewind a free twice.  We only want to
    call tree_mod_log_free_eb if we are actually freeing the block.  With this patch
    I no longer hit the panic in __tree_mod_log_rewind.  Thanks,
    
    Cc: stable@vger.kernel.org
    Reviewed-by: default avatarJan Schmidt <list.btrfs@jan-o-sch.net>
    Signed-off-by: default avatarJosef Bacik <jbacik@fusionio.com>
    7fb7d76f
ctree.c 147 KB