Btrfs: use bigger metadata chunks on bigger filesystems

The 256MB chunk is a little small on a huge FS.  This scales up the
chunk size.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index f4b839f..ac00e3a 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2441,7 +2441,11 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
                max_stripe_size = 1024 * 1024 * 1024;
                max_chunk_size = 10 * max_stripe_size;
        } else if (type & BTRFS_BLOCK_GROUP_METADATA) {
-               max_stripe_size = 256 * 1024 * 1024;
+               /* for larger filesystems, use larger metadata chunks */
+               if (fs_devices->total_rw_bytes > 50ULL * 1024 * 1024 * 1024)
+                       max_stripe_size = 1024 * 1024 * 1024;
+               else
+                       max_stripe_size = 256 * 1024 * 1024;
                max_chunk_size = max_stripe_size;
        } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
                max_stripe_size = 8 * 1024 * 1024;