Btrfs: Add missing mnt_drop_write in ioctl.c

This patch adds the missing mnt_drop_write to match
mnt_want_write in btrfs_ioctl_defrag and btrfs_ioctl_clone

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 5d67858..ab429fe 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -646,6 +646,7 @@ static int btrfs_ioctl_defrag(struct file *file)
                break;
        }
 
+       mnt_drop_write(file->f_path.mnt);
        return 0;
 }
 
@@ -730,8 +731,10 @@ static long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
                return ret;
 
        src_file = fget(srcfd);
-       if (!src_file)
-               return -EBADF;
+       if (!src_file) {
+               ret = -EBADF;
+               goto out_drop_write;
+       }
        src = src_file->f_dentry->d_inode;
 
        ret = -EINVAL;
@@ -982,6 +985,8 @@ out_unlock:
        btrfs_free_path(path);
 out_fput:
        fput(src_file);
+out_drop_write:
+       mnt_drop_write(file->f_path.mnt);
        return ret;
 }