Btrfs: Add BH_Defrag to mark buffers that are in need of defragging
This allows the tree walking code to defrag only the newly allocated
buffers, it seems to be a good balance between perfect defragging and the
performance hit of repeatedly reallocating blocks.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 9e2c261..81fd18c 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -25,8 +25,10 @@
enum btrfs_bh_state_bits {
BH_Checked = BH_PrivateStart,
+ BH_Defrag,
};
BUFFER_FNS(Checked, checked);
+BUFFER_FNS(Defrag, defrag);
static inline struct btrfs_node *btrfs_buffer_node(struct buffer_head *bh)
{