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udev: create symlinks and watch even in suspended state

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If a dm device is suspended, we can't run blkid on it. But earlier
rules (e.g. 11-dm-parts.rules) might have imported previously scanned
properties from the udev db, in particular if the device had been correctly
set up beforehand (DM_UDEV_PRIMARY_SOURCE_FLAG==1). Symlinks for existing
ID_FS_xyz properties must be preserved in this case. Otherwise lower-priority
devices (such as multipath components) might take over the symlink
temporarily.

Likewise, we should't stop watching a temporarily suspended, but previously
correctly configured dm device.

Signed-off-by: Martin Wilck <mwilck@suse.com>
This commit is contained in:
Martin Wilck 2022-01-28 14:42:29 +01:00 committed by Zdenek Kabelac
parent ee8fb0310c
commit e10f67e917
1 changed files with 4 additions and 0 deletions
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4
udev/13-dm-disk.rules.in
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@ -17,10 +17,14 @@ 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{DM_SUSPENDED}=="1", ENV{DM_UDEV_PRIMARY_SOURCE_FLAG}=="1", GOTO="dm_link"
ENV{DM_NOSCAN}=="1", ENV{DM_UDEV_PRIMARY_SOURCE_FLAG}=="1", GOTO="dm_link"
ENV{DM_SUSPENDED}=="1", GOTO="dm_end"
ENV{DM_NOSCAN}=="1", GOTO="dm_watch"
(BLKID_RULE)
LABEL="dm_link"
ENV{DM_UDEV_LOW_PRIORITY_FLAG}=="1", OPTIONS="link_priority=-100"
ENV{ID_FS_USAGE}=="filesystem|other|crypto", ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"
ENV{ID_FS_USAGE}=="filesystem|other", ENV{ID_FS_LABEL_ENC}=="?*", SYMLINK+="disk/by-label/$env{ID_FS_LABEL_ENC}"