switch a bunch of places to mnt_want_write_file()

it's both faster (in case when file has been opened for write) and cleaner.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 5 insertions, 5 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index c04f02c7d5bb..20dd8f3b6c72 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -201,7 +201,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
                 }
         }
 
-        ret = mnt_want_write(file->f_path.mnt);
+        ret = mnt_want_write_file(file);
         if (ret)
                 goto out_unlock;
 
@@ -1855,7 +1855,7 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
                 goto out;
         }
 
-        err = mnt_want_write(file->f_path.mnt);
+        err = mnt_want_write_file(file);
         if (err)
                 goto out;
 
@@ -1987,7 +1987,7 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
         if (btrfs_root_readonly(root))
                 return -EROFS;
 
-        ret = mnt_want_write(file->f_path.mnt);
+        ret = mnt_want_write_file(file);
         if (ret)
                 return ret;
 
@@ -2195,7 +2195,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
         if (btrfs_root_readonly(root))
                 return -EROFS;
 
-        ret = mnt_want_write(file->f_path.mnt);
+        ret = mnt_want_write_file(file);
         if (ret)
                 return ret;
 
@@ -2549,7 +2549,7 @@ static long btrfs_ioctl_trans_start(struct file *file)
         if (btrfs_root_readonly(root))
                 goto out;
 
-        ret = mnt_want_write(file->f_path.mnt);
+        ret = mnt_want_write_file(file);
         if (ret)
                 goto out;