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path_id: reintroduce by-path links for virtio block devices

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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
This commit is contained in:
Michal Sekletar 2016-02-09 09:57:45 +01:00
parent 70b65964d7
commit f073b1b3c0
1 changed files with 6 additions and 0 deletions
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6
src/udev/udev-builtin-path_id.c
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@ -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");