btrfs-progs: extend balance args to take min/max usage filter

Add the overlapping usage and [usage_min, usage_max] members to the
balance args. The min/max values are interpreted iff the corresponding
flag BTRFS_BALANCE_ARGS_USAGE_RANGE is set.

The minimum boundary is inclusive, maximum is exclusive:
* usage_min <= chunk_usage < usage_max

Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/volumes.h b/volumes.h
index f5064304..c0007adc 100644
--- a/volumes.h
+++ b/volumes.h
@@ -138,6 +138,7 @@ struct map_lookup {
 #define BTRFS_BALANCE_ARGS_LIMIT	(1ULL << 5)
 #define BTRFS_BALANCE_ARGS_LIMIT_RANGE	(1ULL << 6)
 #define BTRFS_BALANCE_ARGS_STRIPES_RANGE (1ULL << 7)
+#define BTRFS_BALANCE_ARGS_USAGE_RANGE	(1ULL << 10)
 
 /*
  * Profile changing flags.  When SOFT is set we won't relocate chunk if