1 files changed, 5 insertions, 1 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index a979ab7d396..45910d4b8f6 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1137,12 +1137,16 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
                         ra_index += max_cluster;
                 }
 
+                mutex_lock(&inode->i_mutex);
                 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
-                if (ret < 0)
+                if (ret < 0) {
+                        mutex_unlock(&inode->i_mutex);
                         goto out_ra;
+                }
 
                 defrag_count += ret;
                 balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret);
+                mutex_unlock(&inode->i_mutex);
 
                 if (newer_than) {
                         if (newer_off == (u64)-1)