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raw-posix: Detect CDROM via ioctl on linux 

Current CDROM detection is hardcoded based on source file name.
Make this smarter on linux by attempting a CDROM specific ioctl.

This makes '-cdrom /dev/sr0' succeed with no media present.

v2:
    Give ioctl check higher priority than filename check.

v3:
    Actually initialize 'prio' variable.
    Check for ioctl success rather than absence of specific failure.

v4:
    Explicitly mention that change is linux specific.

Signed-off-by: Cole Robinson <crobinso@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Cole Robinson 2010-01-14 11:19:40 -05:00 committed by Anthony Liguori
parent 301d2908b9
commit 3baf720e6b
1 changed files with 18 additions and 2 deletions
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20
block/raw-posix.c
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@ -1140,9 +1140,25 @@ static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
static int cdrom_probe_device(const char *filename) static int cdrom_probe_device(const char *filename)
{ {
int fd, ret;
int prio = 0;
if (strstart(filename, "/dev/cd", NULL)) if (strstart(filename, "/dev/cd", NULL))
return 100; prio = 50;
return 0;
fd = open(filename, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
goto out;
}
/* Attempt to detect via a CDROM specific ioctl */
ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
if (ret >= 0)
prio = 100;
close(fd);
out:
return prio;
} }
static int cdrom_is_inserted(BlockDriverState *bs) static int cdrom_is_inserted(BlockDriverState *bs)