Dne 12. 04. 19 v 16:56 Eric Ren napsal(a):
Hi,
Since the /dev/dm-x has been created, I don't understand what it waits
udev to do?
Just waits udev rules to create device symbol links?
Although the /dev/dm-26 is visible, but the device seems not ready in kernel.
[root@iZuf6dbyd7ede51sykedamZ ~]# dmsetup udevcookies
Cookie Semid Value Last semop time Last change time
0xd4d0b57 225214464 2 Fri Apr 12 17:33:14 2019 Fri Apr
12 17:33:14 2019
[root@iZuf6dbyd7ede51sykedamZ ~]# dmsetup info /dev/dm-26
Device dm-26 not found
Command failed.
[root@iZuf6dbyd7ede51sykedamZ ~]# ls -l /dev/dm-26
brw-rw---- 1 root disk 252, 26 4月 12 17:33 /dev/dm-26
Is that happening on any modern distro ??
AFAIK no udev rule should ever by executed on DM device with empty table...
udev rules are detecting this state and should avoid DM device until it has
resumed table.
Or is this same race when udev rule is accessing some device while device is
being changed ?
Zdenek
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