[Qemu-devel] [PATCH v2] raw-posix: Detect legacy floppy via ioctl

[Cole Robinson <crobinso@redhat.com>]

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

v2: Give ioctl check higher priority than filename check,
    s/IDE/legacy/

Signed-off-by: Cole Robinson <crobinso@redhat.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 b7254d8..d67280e 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1055,9 +1055,25 @@ static int floppy_open(BlockDriverState *bs, const char *filename, int flags)
 
 static int floppy_probe_device(const char *filename)
 {
+    int fd, ret, prio;
+    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 && errno == EINVAL))
+        prio = 100;
+
+    close(fd);
+out:
+    return prio;
 }
 
 
-- 
1.6.5.2