Btrfs: Disable btree reada during extent backref lookups.

This reada is generally not effective.

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

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 68137cd8506affb840ddbb38848abd268c2dc380..660b05a4baf5dd30ac0cc00c8171b918d349da5a 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -630,6 +630,7 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
        if (!path)
                return -ENOMEM;
 
+       path->reada = 0;
        key.objectid = bytenr;
        btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
        key.offset = num_bytes;
@@ -649,6 +650,7 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
 
        btrfs_release_path(root->fs_info->extent_root, path);
 
+       path->reada = 0;
        ret = btrfs_insert_extent_backref(trans, root->fs_info->extent_root,
                                          path, bytenr, root_objectid,
                                          ref_generation, owner, owner_offset);
@@ -680,6 +682,7 @@ static int lookup_extent_ref(struct btrfs_trans_handle *trans,
 
        WARN_ON(num_bytes < root->sectorsize);
        path = btrfs_alloc_path();
+       path->reada = 0;
        key.objectid = bytenr;
        key.offset = num_bytes;
        btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
@@ -1240,6 +1243,7 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
        if (!path)
                return -ENOMEM;
 
+       path->reada = 0;
        ret = lookup_extent_backref(trans, extent_root, path,
                                    bytenr, root_objectid,
                                    ref_generation,