@@ -46,6 +46,8 @@
#include <sys/dkio.h>
#endif
#ifdef __linux__
+#include <sys/types.h>
+#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <linux/cdrom.h>
@@ -1188,6 +1190,7 @@ static int floppy_probe_device(const char *filename)
int fd, ret;
int prio = 0;
struct floppy_struct fdparam;
+ struct stat st;
if (strstart(filename, "/dev/fd", NULL))
prio = 50;
@@ -1196,12 +1199,20 @@ static int floppy_probe_device(const char *filename)
if (fd < 0) {
goto out;
}
+ ret = fstat(fd, &st);
+ if (ret == -1) {
+ goto outc;
+ }
+ if (!S_ISBLK(st.st_mode)) {
+ goto outc;
+ }
/* Attempt to detect via a floppy specific ioctl */
ret = ioctl(fd, FDGETPRM, &fdparam);
if (ret >= 0)
prio = 100;
+outc:
close(fd);
out:
return prio;
@@ -1290,17 +1301,26 @@ static int cdrom_probe_device(const char *filename)
{
int fd, ret;
int prio = 0;
+ struct stat st;
fd = open(filename, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
goto out;
}
+ ret = fstat(fd, &st);
+ if (ret == -1) {
+ goto outc;
+ }
+ if (!S_ISBLK(st.st_mode)) {
+ goto outc;
+ }
/* Attempt to detect via a CDROM specific ioctl */
ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
if (ret >= 0)
prio = 100;
+outc:
close(fd);
out:
return prio;
@@ -1309,11 +1329,15 @@ out:
static int cdrom_is_inserted(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
+ struct stat st;
int ret;
- ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
- if (ret == CDS_DISC_OK)
- return 1;
+ ret = fstat(s->fd, &st);
+ if (!ret && S_ISBLK(st.st_mode)) {
+ ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
+ if (ret == CDS_DISC_OK)
+ return 1;
+ }
return 0;
}
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. Work around by calling fstat() the ensure the ioctls are only used on block devices. Signed-off-by: Johannes Stezenbach <js@sig21.net> --- discussed in http://lkml.kernel.org/r/20110617090424.GA19345@sig21.net I'll also send a Linux kernel patch but this is needed to fix the warning on old kernels.