[Qemu-devel] [PATCH 2/2] Add virtio-blk by-id rules based on 'serial' attribute

[Ryan Harper <ryanh@us.ibm.com>]

Using virtio-blk serial attributes add rules to extract drive serial numbers and
generate by-id links for the block device and partitions.

With these rules added, we now see the following symlinks in disk/by-id

% ls -al /dev/disk/by-id | grep vdb
lrwxrwxrwx. 1 root root   9 Jun  1 22:09 virtio-QM00001 -> ../../vda
lrwxrwxrwx. 1 root root  10 Jun  1 22:09 virtio-QM00001-part1 -> ../../vda1

Signed-off-by: Ryan Harper <ryanh@us.ibm.com>
---
 rules/rules.d/60-persistent-storage.rules |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/rules/rules.d/60-persistent-storage.rules b/rules/rules.d/60-persistent-storage.rules
index 1f46041..6449e07 100644
--- a/rules/rules.d/60-persistent-storage.rules
+++ b/rules/rules.d/60-persistent-storage.rules
@@ -18,6 +18,10 @@ TEST=="whole_disk", GOTO="persistent_storage_end"
 # for partitions import parent information
 ENV{DEVTYPE}=="partition", IMPORT{parent}="ID_*"
 
+# virtio-blk
+KERNEL=="vd*[!0-9]", ATTRS{serial}=="?*", ENV{ID_SERIAL}="$attr{serial}", SYMLINK+="disk/by-id/virtio-$env{ID_SERIAL}"
+KERNEL=="vd*[0-9]", ATTRS{serial}=="?*", ENV{ID_SERIAL}="$attr{serial}", SYMLINK+="disk/by-id/virtio-$env{ID_SERIAL}-part%n"
+
 # USB devices use their own serial number
 KERNEL=="sd*[!0-9]|sr*", ENV{ID_SERIAL}!="?*", SUBSYSTEMS=="usb", IMPORT{program}="usb_id --export %p"
 # ATA devices with their own "ata" kernel subsystem
-- 
1.6.3.3