compat_ioctl: fix warning caused by qemu

On Linux x86_64 host with 32bit userspace, running
qemu or even just "qemu-img create -f qcow2 some.img 1G"
causes a kernel warning:

ioctl32(qemu-img:5296): Unknown cmd fd(3) cmd(00005326){t:'S';sz:0} arg(7fffffff) on some.img
ioctl32(qemu-img:5296): Unknown cmd fd(3) cmd(801c0204){t:02;sz:28} arg(fff77350) on some.img

ioctl 00005326 is CDROM_DRIVE_STATUS,
ioctl 801c0204 is FDGETPRM.

The warning appears because the Linux compat-ioctl handler for these
ioctls only applies to block devices, while qemu also uses the ioctls on
plain files.

Signed-off-by: Johannes Stezenbach <js@sig21.net>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/include/linux/fd.h b/include/linux/fd.h
index f5d194af07a8..c6a68d011608 100644
--- a/include/linux/fd.h
+++ b/include/linux/fd.h
@@ -3,6 +3,7 @@
 
 #include <linux/ioctl.h>
 #include <linux/compiler.h>
+#include <linux/compat.h>
 
 /* New file layout: Now the ioctl definitions immediately follow the
  * definitions of the structures that they use */
@@ -377,4 +378,21 @@ struct floppy_raw_cmd {
 #define FDEJECT _IO(2, 0x5a)
 /* eject the disk */
 
+#ifdef CONFIG_COMPAT
+struct compat_floppy_struct {
+        compat_uint_t   size;
+        compat_uint_t   sect;
+        compat_uint_t   head;
+        compat_uint_t   track;
+        compat_uint_t   stretch;
+        unsigned char   gap;
+        unsigned char   rate;
+        unsigned char   spec1;
+        unsigned char   fmt_gap;
+        const compat_caddr_t name;
+};
+
+#define FDGETPRM32 _IOR(2, 0x04, struct compat_floppy_struct)
+#endif
+
 #endif