From 2ebf7c4b82f7b569cb74e9641968bf4a1da25d3d Mon Sep 17 00:00:00 2001
From: Cole Robinson <crobinso@redhat.com>
Date: Thu, 14 Jan 2010 11:19:41 -0500
Subject: [PATCH] raw-posix: Detect legacy floppy via ioctl on linux
Current legacy floppy detection is hardcoded based on source file
name. Make this smarter on linux by attempting a floppy specific
ioctl.
v2:
Give ioctl check higher priority than filename check
s/IDE/legacy/
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 | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index a2c7508856..eea7e56e59 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1055,9 +1055,26 @@ static int floppy_open(BlockDriverState *bs, const char *filename, int flags)
static int floppy_probe_device(const char *filename)
{
+ int fd, ret;
+ int prio = 0;
+ struct floppy_struct fdparam;
+
if (strstart(filename, "/dev/fd", NULL))
- return 100;
- return 0;
+ prio = 50;
+
+ fd = open(filename, O_RDONLY | O_NONBLOCK);
+ if (fd < 0) {
+ goto out;
+ }
+
+ /* Attempt to detect via a floppy specific ioctl */
+ ret = ioctl(fd, FDGETPRM, &fdparam);
+ if (ret >= 0)
+ prio = 100;
+
+ close(fd);
+out:
+ return prio;
}