Btrfs: Scale the bdi ra_pages by the number of devices in the FS

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

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index b479cdfe3ee8..46188ee16623 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -932,7 +932,7 @@ static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
         bdi_init(bdi);
 #endif
-        bdi->ra_pages   = default_backing_dev_info.ra_pages * 4;
+        bdi->ra_pages   = default_backing_dev_info.ra_pages;
         bdi->state              = 0;
         bdi->capabilities       = default_backing_dev_info.capabilities;
         bdi->unplug_io_fn       = btrfs_unplug_io_fn;
@@ -1214,6 +1214,8 @@ struct btrfs_root *open_ctree(struct super_block *sb,
                        (unsigned long long)fs_devices->num_devices);
                 goto fail_sb_buffer;
         }
+        fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
+
         nodesize = btrfs_super_nodesize(disk_super);
         leafsize = btrfs_super_leafsize(disk_super);
         sectorsize = btrfs_super_sectorsize(disk_super);