Btrfs: Use blk_congestion_wait on older kernels
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index cd29922..731a534 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -919,8 +919,13 @@
struct backing_dev_info *bdi;
bdi = root->fs_info->sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
- if (root->fs_info->throttles && bdi_write_congested(bdi))
+ if (root->fs_info->throttles && bdi_write_congested(bdi)) {
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
congestion_wait(WRITE, HZ/20);
+#else
+ blk_congestion_wait(WRITE, HZ/20);
+#endif
+ }
}
void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)