1 files changed, 2 insertions, 2 deletions

diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 06658caa18bd..0b6387c67e6c 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -182,7 +182,7 @@ static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
         if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
                 goto out;
 
-        down_read(&inode->i_sb->s_umount);
+        mutex_lock(&nilfs->ns_snapshot_mount_mutex);
 
         nilfs_transaction_begin(inode->i_sb, &ti, 0);
         ret = nilfs_cpfile_change_cpmode(
@@ -192,7 +192,7 @@ static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
         else
                 nilfs_transaction_commit(inode->i_sb); /* never fails */
 
-        up_read(&inode->i_sb->s_umount);
+        mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
 out:
         mnt_drop_write_file(filp);
         return ret;