daandemeyer / rpms / systemd

Forked from rpms/systemd 2 years ago
Clone
1abbee
From b6fea1a0e0fd830e1aa82accf389cb8bfd0f0f37 Mon Sep 17 00:00:00 2001
1abbee
From: Michal Sekletar <msekleta@redhat.com>
1abbee
Date: Tue, 9 Feb 2016 09:57:45 +0100
1abbee
Subject: [PATCH] path_id: reintroduce by-path links for virtio block devices
1abbee
1abbee
Enumeration of virtio buses is global and hence
1abbee
non-deterministic. However, we are guaranteed there is never going to be
1abbee
more than one virtio bus per parent PCI device. While populating
1abbee
ID_PATH we simply skip virtio part of the syspath and we extend the path
1abbee
using the sysname of the parent PCI device.
1abbee
1abbee
With this patch udev creates following by-path links for virtio-blk
1abbee
device /dev/vda which contains two partitions.
1abbee
1abbee
ls -l /dev/disk/by-path/
1abbee
total 0
1abbee
lrwxrwxrwx 1 root root  9 Feb  9 10:47 virtio-pci-0000:00:05.0 -> ../../vda
1abbee
lrwxrwxrwx 1 root root 10 Feb  9 10:47 virtio-pci-0000:00:05.0-part1 -> ../../vda1
1abbee
lrwxrwxrwx 1 root root 10 Feb  9 10:47 virtio-pci-0000:00:05.0-part2 -> ../../vda2
1abbee
1abbee
See:
1abbee
http://lists.linuxfoundation.org/pipermail/virtualization/2015-August/030328.html
1abbee
1abbee
Fixes #2501
1abbee
1abbee
Cherry-picked from: f073b1b3c0f4f0df1b0bd61042ce85fb5d27d407
1abbee
Resolves: #952567
1abbee
---
1abbee
 src/udev/udev-builtin-path_id.c | 6 ++++++
1abbee
 1 file changed, 6 insertions(+)
1abbee
1abbee
diff --git a/src/udev/udev-builtin-path_id.c b/src/udev/udev-builtin-path_id.c
c62b8e
index 3b72922d48..8359e236a1 100644
1abbee
--- a/src/udev/udev-builtin-path_id.c
1abbee
+++ b/src/udev/udev-builtin-path_id.c
1abbee
@@ -698,6 +698,12 @@ restart:
1abbee
                         path_prepend(&path, "xen-%s", udev_device_get_sysname(parent));
1abbee
                         parent = skip_subsystem(parent, "xen");
1abbee
                         supported_parent = true;
1abbee
+                } else if (streq(subsys, "virtio")) {
1abbee
+                        while (parent && streq_ptr("virtio", udev_device_get_subsystem(parent)))
1abbee
+                                parent = udev_device_get_parent(parent);
1abbee
+                        path_prepend(&path, "virtio-pci-%s", udev_device_get_sysname(parent));
1abbee
+                        supported_transport = true;
1abbee
+                        supported_parent = true;
1abbee
                 } else if (streq(subsys, "scm")) {
1abbee
                         path_prepend(&path, "scm-%s", udev_device_get_sysname(parent));
1abbee
                         parent = skip_subsystem(parent, "scm");