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authorMichal Sekletar <msekleta@redhat.com>2016-02-09 09:57:45 +0100
committerMichal Sekletar <msekleta@redhat.com>2016-02-09 12:25:42 +0100
commitf073b1b3c0f4f0df1b0bd61042ce85fb5d27d407 (patch)
tree0a849ee98e45e1c3ec8328d3636b3600f02fbdb9
parent70b65964d7ef03621f5d4abd23150c1b121989b4 (diff)
path_id: reintroduce by-path links for virtio block devices
Enumeration of virtio buses is global and hence non-deterministic. However, we are guaranteed there is never going to be more than one virtio bus per parent PCI device. While populating ID_PATH we simply skip virtio part of the syspath and we extend the path using the sysname of the parent PCI device. With this patch udev creates following by-path links for virtio-blk device /dev/vda which contains two partitions. ls -l /dev/disk/by-path/ total 0 lrwxrwxrwx 1 root root 9 Feb 9 10:47 virtio-pci-0000:00:05.0 -> ../../vda lrwxrwxrwx 1 root root 10 Feb 9 10:47 virtio-pci-0000:00:05.0-part1 -> ../../vda1 lrwxrwxrwx 1 root root 10 Feb 9 10:47 virtio-pci-0000:00:05.0-part2 -> ../../vda2 See: http://lists.linuxfoundation.org/pipermail/virtualization/2015-August/030328.html Fixes #2501
-rw-r--r--src/udev/udev-builtin-path_id.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/udev/udev-builtin-path_id.c b/src/udev/udev-builtin-path_id.c
index 7851cec17f..44fb5334b3 100644
--- a/src/udev/udev-builtin-path_id.c
+++ b/src/udev/udev-builtin-path_id.c
@@ -665,6 +665,12 @@ static int builtin_path_id(struct udev_device *dev, int argc, char *argv[], bool
path_prepend(&path, "xen-%s", udev_device_get_sysname(parent));
parent = skip_subsystem(parent, "xen");
supported_parent = true;
+ } else if (streq(subsys, "virtio")) {
+ while (parent && streq_ptr("virtio", udev_device_get_subsystem(parent)))
+ parent = udev_device_get_parent(parent);
+ path_prepend(&path, "virtio-pci-%s", udev_device_get_sysname(parent));
+ supported_transport = true;
+ supported_parent = true;
} else if (streq(subsys, "scm")) {
path_prepend(&path, "scm-%s", udev_device_get_sysname(parent));
parent = skip_subsystem(parent, "scm");