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

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

1 files changed, 8 insertions, 2 deletions

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 1ed179c020af..c85cb48d95ee 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -512,8 +512,11 @@ int btrfs_write_ordered_inodes(struct btrfs_trans_handle *trans,
                 mutex_unlock(&root->fs_info->trans_mutex);
                 mutex_unlock(&root->fs_info->fs_mutex);
 
-                if (S_ISREG(inode->i_mode))
+                if (S_ISREG(inode->i_mode)) {
+                        atomic_inc(&BTRFS_I(inode)->ordered_writeback);
                         filemap_fdatawrite(inode->i_mapping);
+                        atomic_dec(&BTRFS_I(inode)->ordered_writeback);
+                }
                 iput(inode);
 
                 mutex_lock(&root->fs_info->fs_mutex);
@@ -530,8 +533,11 @@ int btrfs_write_ordered_inodes(struct btrfs_trans_handle *trans,
                 mutex_unlock(&root->fs_info->trans_mutex);
                 mutex_unlock(&root->fs_info->fs_mutex);
 
-                if (S_ISREG(inode->i_mode))
+                if (S_ISREG(inode->i_mode)) {
+                        atomic_inc(&BTRFS_I(inode)->ordered_writeback);
                         filemap_write_and_wait(inode->i_mapping);
+                        atomic_dec(&BTRFS_I(inode)->ordered_writeback);
+                }
                 atomic_dec(&inode->i_count);
                 iput(inode);