Hi Milan,
thanks for your detailed explanations :)
After adding the offsets for LUKS and LVM I realized that I have another
partition residing logically "in front" of the PV:
$ lsblk /dev/sdd -f
NAME FSTYPE LABEL MOUNTPOINT
sdd
├─sdd1 ext2 boot /boot
└─sdd2 LVM2_member
├─m4vg0-root (dm-0) crypto_LUKS
│ └─root-crypt (dm-4) ext4 root-crypt /
(..)
Adding its size in blocks finally resulted in the correct range, and I
saw the random noise of the encrypted testfile disappear after synced
`rm` invocation.
You should be also able to trace discard (and other) block requests
using blktrace/btrace, this should be really more user friendly :)
I tried blktrace but didn't know which event to track. Supported list
includes READ, WRITE, BARRIER, SYNC, QUEUE, REQUEUE, ISSUE, COMPLETE, FS
and PC.
Thanks again for your help! :)
Kind regards,
lynix
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