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