Am 26.08.2011 11:43, schrieb Gerardo Exequiel Pozzi: >> Hm, I did not see that, or misinterpreted it. Looks good, but ... >> >>> If you ask me how to do this is filesystem are built-in in kernel, I do >>> not know. >> Yes, it only works for modules. If we had refcounts for the block >> devices themselves, that would be great. > Yes look at /proc/devices for blocks devs then: > /sys/module/sd_mod/refcnt > /sys/module/loop/refcnt > etc, etc...
Those are kernel modules, not block devices. Depending on kernel configuration, they might be present or not. What I am looking for is a counter for the block device itself (LVM shows the "open count", I would hope that is not dm-specific). >> In our kernel, we do not have built-in file systems, but it is still not >> a generic solution. >> > Looks like we are going beyond what we can see... This is more > heuristic, if you have already unmounted all filesystem, is the task of > the kernel to flush buffers for each block device, then (if apply) sync > device cache and stop it! Sure, that is the kernel's job. But it would also be the kernel's job to tell userspace when it actually finished doing so. > Anyway, so that everyone is happy and friendly, I will use non-lazy > optionIts working fine. In any case, the lazy umount looks useful for the general use case, beyond archiso, if we can solve this.
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