User space parses and passes it via ioctls to the kernel.Where exactly is the LV information passed to the kernel? is it "LV_CREATE"?
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.
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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