• Nikolay Borisov's avatar
    btrfs: Remove unnecessary tree locking code in qgroup_rescan_leaf · df449714
    Nikolay Borisov authored
    In qgroup_rescan_leaf a copy is made of the target leaf by calling
    btrfs_clone_extent_buffer. The latter allocates a new buffer and
    attaches a new set of pages and copies the content of the source buffer.
    The new scratch buffer is only used to iterate it's items, it's not
    published anywhere and cannot be accessed by a third party.
    Hence, it's not necessary to perform any locking on it whatsoever.
    Furthermore, remove the extra extent_buffer_get call since the new
    buffer is always allocated with a reference count of 1 which is
    sufficient here.  No functional changes.
    Signed-off-by: default avatarNikolay Borisov <nborisov@suse.com>
    Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
    Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>