Btrfs: Throttle file_write when data=ordered is flushing the inode

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

1 files changed, 13 insertions, 0 deletions

diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index 3ee51e10c187..b474902c90e2 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -269,3 +269,16 @@ int btrfs_del_ordered_inode(struct inode *inode)
         return ret;
 }
 
+int btrfs_ordered_throttle(struct btrfs_root *root, struct inode *inode)
+{
+        struct btrfs_transaction *cur = root->fs_info->running_transaction;
+        while(cur == root->fs_info->running_transaction &&
+              atomic_read(&BTRFS_I(inode)->ordered_writeback)) {
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
+                congestion_wait(WRITE, HZ/20);
+#else
+                blk_congestion_wait(WRITE, HZ/20);
+#endif
+        }
+        return 0;
+}