block: add bdrv_probe_device method
Add a bdrv_probe_device method to all BlockDriver instances implementing
host devices to move matching of host device types into the actual drivers.
For now we keep exacly the old matching behaviour based on the devices names,
although we really should have better detetion methods based on device
information in the future.
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/block.c b/block.c
index 2e20593..c7e0dcb 100644
--- a/block.c
+++ b/block.c
@@ -209,7 +209,7 @@
filename[1] == ':');
}
-static int is_windows_drive(const char *filename)
+int is_windows_drive(const char *filename)
{
if (is_windows_drive_prefix(filename) &&
filename[2] == '\0')
@@ -253,43 +253,23 @@
* Detect host devices. By convention, /dev/cdrom[N] is always
* recognized as a host CDROM.
*/
-#ifdef _WIN32
static BlockDriver *find_hdev_driver(const char *filename)
{
- if (strstart(filename, "/dev/cdrom", NULL))
- return bdrv_find_format("host_device");
- if (is_windows_drive(filename))
- return bdrv_find_format("host_device");
- return NULL;
-}
-#else
-static BlockDriver *find_hdev_driver(const char *filename)
-{
- struct stat st;
+ int score_max = 0, score;
+ BlockDriver *drv = NULL, *d;
-#ifdef __linux__
- if (strstart(filename, "/dev/fd", NULL))
- return bdrv_find_format("host_floppy");
- if (strstart(filename, "/dev/cd", NULL))
- return bdrv_find_format("host_cdrom");
-#elif defined(__FreeBSD__)
- if (strstart(filename, "/dev/cd", NULL) ||
- strstart(filename, "/dev/acd", NULL)) {
- return bdrv_find_format("host_cdrom");
- }
-#else
- if (strstart(filename, "/dev/cdrom", NULL))
- return bdrv_find_format("host_device");
-#endif
-
- if (stat(filename, &st) >= 0 &&
- (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
- return bdrv_find_format("host_device");
+ for (d = first_drv; d; d = d->next) {
+ if (d->bdrv_probe_device) {
+ score = d->bdrv_probe_device(filename);
+ if (score > score_max) {
+ score_max = score;
+ drv = d;
+ }
+ }
}
- return NULL;
+ return drv;
}
-#endif
static BlockDriver *find_image_format(const char *filename)
{
