[PATCH] add ->compat_ioctl to dasd

Add a compat_ioctl method to the dasd driver so the last entries in
arch/s390/kernel/compat_ioctl.c can go away.  Unlike the previous attempt this
one does not replace the ioctl method with an unlocked_ioctl method so that
the ioctl_by_bdev calls in s390 partition code continue to work.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 14 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 2472fa1a1be1..9c25654b1e75 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -1751,6 +1751,7 @@ dasd_device_operations = {
         .open           = dasd_open,
         .release        = dasd_release,
         .ioctl          = dasd_ioctl,
+        .compat_ioctl   = dasd_compat_ioctl,
         .getgeo         = dasd_getgeo,
 };
 
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index 2fb05c4a528c..e4b401500b01 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -527,6 +527,7 @@ void dasd_ioctl_exit(void);
 int  dasd_ioctl_no_register(struct module *, int, dasd_ioctl_fn_t);
 int  dasd_ioctl_no_unregister(struct module *, int, dasd_ioctl_fn_t);
 int  dasd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
+long dasd_compat_ioctl(struct file *, unsigned int, unsigned long);
 
 /* externals in dasd_proc.c */
 int dasd_proc_init(void);
diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
index 8e4dcd58599e..9396fcacb8f8 100644
--- a/drivers/s390/block/dasd_ioctl.c
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -118,6 +118,18 @@ dasd_ioctl(struct inode *inp, struct file *filp,
         return -EINVAL;
 }
 
+long
+dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+        int rval;
+
+        lock_kernel();
+        rval = dasd_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
+        unlock_kernel();
+
+        return (rval == -EINVAL) ? -ENOIOCTLCMD : rval;
+}
+
 static int
 dasd_ioctl_api_version(struct block_device *bdev, int no, long args)
 {