[PATCH] macros to detect existance of unlocked_ioctl and ioctl_compat

[Michael S. Tsirkin]

Hello!
Quoting r. Andrew Morton (akpm@xxxxxxxx) "Re: [PATCH] deprecate (un)register_ioctl32_conversion":
> Takashi Iwai <tiwai@xxxxxxx> wrote:
> >
> > At Wed, 5 Jan 2005 16:40:43 +0200,
> >  Michael S. Tsirkin wrote:
> >  > 
> >  > Hello, Andrew, all!
> >  > 
> >  > Since in -mm1 we now have a race-free replacement (that being ioctl_compat),
> >  > here is a patch to deprecate (un)register_ioctl32_conversion.
> > 
> >  Good to see that ioctl_native and ioctl_compat ops are already there!
> > 
> >  Will it be merged to 2.6.11?
> 
> It should be, unless there's some problem.  In maybe a week or so.

To make life bearable for out-of kernel modules, the following patch
adds 2 macros so that existance of unlocked_ioctl and ioctl_compat
can be easily detected.

Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxxxxxx>

diff -puN include/linux/fs.h~ioctl-rework include/linux/fs.h
--- 25/include/linux/fs.h~ioctl-rework	Thu Dec 16 15:48:31 2004
+++ 25-akpm/include/linux/fs.h	Thu Dec 16 15:48:31 2004
@@ -907,6 +907,12 @@ typedef struct {
 
 typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
 
+/* These macros are for out of kernel modules to test that
+ * the kernel supports the unlocked_ioctl and ioctl_compat
+ * fields in struct file_operations. */
+#define HAVE_IOCTL_COMPAT 1
+#define HAVE_UNLOCKED_IOCTL 1
+
 /*
  * NOTE:
  * read, write, poll, fsync, readv, writev can be called
-
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