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Re: [linux-lvm] LV only detected when using "lvscan -D" on amd64kernel



Hi,

User space parses and passes it via ioctls to the kernel.
Please look at lvm.h for the ioctls defined and the structures involved.
Grep the LVM1 library source in tools/lib/ for "ioctl" to get you started.


Where exactly is the LV information passed to the kernel? is it "LV_CREATE"?

The kernel seems to don't know the LV, the LV_STATUS_BYINDEX on the "/dev/fast/group" returns "No such device or address" (ENXIO) for each index, including 0, which should be the LV in question.

It looks as "lvm_do_lv_status_byindex" in the kernel returns -ENXIO because vg_ptr->lv[lv_status_byindex_req.lv_index] is zero. Where is the point where this array is written? I only found LV_CREATE, but that's only called in vgimport, vgmerge and lvcreate, so it looks as there is another place.


Can you point me in the direction?



Felix






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