Btrfs: add basic infrastructure for selective balancing
This allows to have a separate set of filters for each chunk type
(data,meta,sys). The code however is generic and switch on chunk type
is only done once.
This commit also adds a type filter: it allows to balance for example
meta and system chunks w/o touching data ones.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 8825823..003e542 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -186,6 +186,17 @@
#define map_lookup_size(n) (sizeof(struct map_lookup) + \
(sizeof(struct btrfs_bio_stripe) * (n)))
+/*
+ * Restriper's general type filter
+ */
+#define BTRFS_BALANCE_DATA (1ULL << 0)
+#define BTRFS_BALANCE_SYSTEM (1ULL << 1)
+#define BTRFS_BALANCE_METADATA (1ULL << 2)
+
+#define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
+ BTRFS_BALANCE_SYSTEM | \
+ BTRFS_BALANCE_METADATA)
+
struct btrfs_balance_args;
struct btrfs_balance_control {
struct btrfs_fs_info *fs_info;