[PATCH] change get_sb prototype

(i) The prototypes for free_vfsmnt(), alloc_vfsmnt(), do_kern_mount()
    so far occurred in several individual c files.  Now they are in
    <linux/mount.h>.

(ii) do_kern_mount() has a third argument name that is typically a
     constant.  It is called with "rootfs", "nfsd", type->name,
     "capifs", "usbdevfs", "binfmt_misc" etc.  So, it should have a
     prototype that expresses this:

	do_kern_mount(const char *fstype, int flags, const char *name, void *data);

This makes the ugly cast

-       return do_kern_mount(type->name, 0, (char *)type->name, NULL);
+       return do_kern_mount(type->name, 0, type->name, NULL);

go away. Now do_kern_mount() calls type->get_sb(), so also get_sb()
must have a const third argument. That is what the patch below does.

If I am not mistaken, precisely two filesystems do not treat this
argument as a constant, namely afs and cifs. A separate patch
gives some cleanup there.

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/devfs/base.c b/fs/devfs/base.c
index 6ca2544a5322..5e6374bc8d20 100644
--- a/fs/devfs/base.c
+++ b/fs/devfs/base.c
@@ -2554,8 +2554,9 @@ out_no_root:
     return -EINVAL;
 }   /*  End Function devfs_fill_super  */
 
-static struct super_block *devfs_get_sb (struct file_system_type *fs_type,
-					 int flags, char *dev_name, void *data)
+static struct super_block *
+devfs_get_sb (struct file_system_type *fs_type, int flags,
+	      const char *dev_name, void *data)
 {
     return get_sb_single (fs_type, flags, data, devfs_fill_super);
 }