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udev: Use parent bus id for virtio disk builtin path-id (#5500)

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The builtin path id for virtio block devices has been changed
to use the bus id without a prefix "virtio-pci" to be
compatible with all virtio transport types.

In order to not break existing setups, the by-path symlinks for
virtio block devices on the PCI bus are reintroduced by udev rules.
The virtio-pci symlinks are considered to be deprecated and
should be replaced by the native PCI symlinks.

Example output for a virtio disk in PCI slot 7:
 $ ls  /dev/disk/by-path
 pci-0000:00:07.0
 pci-0000:00:07.0-part1
 virtio-pci-0000:00:07.0
 virtio-pci-0000:00:07.0-part1

See also
[1] https://lists.freedesktop.org/archives/systemd-devel/2017-February/038326.html
[2] https://lists.freedesktop.org/archives/systemd-devel/2017-March/038397.html

This reverts f073b1b but keeps the same symlinks for compatibility.
This commit is contained in:
Viktor Mihajlovski
2017-03-01 15:30:17 -05:00
committed by Zbigniew Jędrzejewski-Szmek
parent 2a75df743b
commit fb92fbb1b1
2 changed files with 5 additions and 4 deletions
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src/udev/udev-builtin-path_id.c
+1 -4
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@@ -664,11 +664,8 @@ static int builtin_path_id(struct udev_device *dev, int argc, char *argv[], bool
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));
parent = skip_subsystem(parent, "virtio");
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");