Btrfs: devid subset filter

Select chunks which have at least one byte of at least one stripe
located on a device with devid X in a given [pstart,pend) physical
address range.

This filter only works when devid filter is turned on.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 7cfec03c29b8..844b08e388f2 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -202,6 +202,7 @@ struct map_lookup {
 #define BTRFS_BALANCE_ARGS_PROFILES     (1ULL << 0)
 #define BTRFS_BALANCE_ARGS_USAGE        (1ULL << 1)
 #define BTRFS_BALANCE_ARGS_DEVID        (1ULL << 2)
+#define BTRFS_BALANCE_ARGS_DRANGE       (1ULL << 3)
 
 struct btrfs_balance_args;
 struct btrfs_balance_control {