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udev: create /dev/disk/by-diskseq/<DISKSEQ> symlink for public DM devices

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All block devices have a disk sequence number assigned (an ever-increasing 64 bit
sequence number) since kernel v5.15 (February 2021). The number is exported through
/sys/block/<disk>/diskseq property and also as DISKSEQ udev event variable.
The diskseq helps with referencing a device throughout its existence in
race-free way.

By default, the /usr/lib/udev/rules.d/60-persistent-storage.rules set
/dev/disk/by-diskseq/<diskseq> symlink for each block device. However,
these rules do not apply for DM devices because we manage the symlinks
ourselves in 13-dm-disk.rules where it properly follows the
DM_UDEV_DISABLE_DISK_RULES flag, among other things.

Add a rule to 13-dm-disk.rules to create the /dev/disk/by-diskseq/<diskseq>.
This commit is contained in:
Peter Rajnoha 2024-12-09 13:05:03 +01:00
parent 85014fcd6d
commit 32ab91e528
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2 changed files with 3 additions and 0 deletions
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1
WHATS_NEW_DM
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@ -1,5 +1,6 @@
Version 1.02.204 -
===================
Create /dev/disk/by-diskseq/<DISKSEQ> symlink for public DM devices.
Version 1.02.203 - 09th December 2024
=====================================

2
udev/13-dm-disk.rules.in
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@ -17,6 +17,8 @@ ENV{DM_UDEV_DISABLE_DISK_RULES_FLAG}=="1", GOTO="dm_end"
SYMLINK+="disk/by-id/dm-name-$env{DM_NAME}"
ENV{DM_UUID}=="?*", SYMLINK+="disk/by-id/dm-uuid-$env{DM_UUID}"
ENV{DISKSEQ}=="?*", SYMLINK+="disk/by-diskseq/$env{DISKSEQ}"
ENV{.DM_SUSPENDED}=="1", ENV{DM_UDEV_PRIMARY_SOURCE_FLAG}=="1", GOTO="dm_import"
ENV{.DM_NOSCAN}=="1", ENV{DM_UDEV_PRIMARY_SOURCE_FLAG}=="1", GOTO="dm_import"
ENV{.DM_SUSPENDED}=="1", GOTO="dm_end"