Hi,
If I understand right, when kernel sends a KOBJ_CHANGE uevent, udevd
catches it and
update the ctime/mtime of the device file in /dev according to the uevent.
Do I understand the procedure right?
Then a problem occurs to me that, the above procedure is asynchronized,
so sometimes concurreny may happen when kernel send the uevent but udev has
not yet updated the ctime/mtime of device file, making libblkid cache
still valid and gives wrong result.
(bringing the old thread again:
http://www.spinics.net/lists/util-linux-ng/msg09154.html)
So i'm wondering is there some synchronized method to send uevent and
wait for it completed?
Currently I use a method that opens and updates ctime/mtime in kernel
spaces, but it's somewhat
ugly.
Hope there will be some elegent method.
Thanks,
Qu
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