Btrfs: Add readahead to the online shrinker, and a mount -o alloc_start= for testing

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

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index b83a1bec346f..d6e5c19969b0 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -324,6 +324,7 @@ struct btrfs_fs_info {
         u64 last_trans_committed;
         unsigned long mount_opt;
         u64 max_extent;
+        u64 alloc_start;
         struct btrfs_transaction *running_transaction;
         struct btrfs_super_block super_copy;
         struct extent_buffer *sb_buffer;