62 lines
1.6 KiB
Diff
62 lines
1.6 KiB
Diff
From 78a27b6a8f394c5a987c31aaf308e11556280f6a Mon Sep 17 00:00:00 2001
|
|
From: Cole Robinson <crobinso@redhat.com>
|
|
Date: Thu, 14 Jan 2010 16:19:40 +0000
|
|
Subject: [PATCH] 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>
|
|
---
|
|
block/raw-posix.c | 20 ++++++++++++++++++--
|
|
1 files changed, 18 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/block/raw-posix.c b/block/raw-posix.c
|
|
index c204cf9..1c777a1 100644
|
|
--- a/block/raw-posix.c
|
|
+++ b/block/raw-posix.c
|
|
@@ -1142,9 +1142,25 @@ static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
|
|
|
|
static int cdrom_probe_device(const char *filename)
|
|
{
|
|
+ int fd, ret;
|
|
+ int prio = 0;
|
|
+
|
|
if (strstart(filename, "/dev/cd", NULL))
|
|
- return 100;
|
|
- return 0;
|
|
+ prio = 50;
|
|
+
|
|
+ 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)
|
|
--
|
|
1.6.6.1
|
|
|