tree fe95facb465d0cac76c4d99db8b31bdc0eef88e4
parent 107eb062d8ebbc9a659c67e8fdfe762d1a968edb
author Jan Schär <jan@jschaer.ch> 1712835700 +0200
committer Jan Schär <jan@jschaer.ch> 1712847199 +0000

m/p/blockdev: fix discard

Fix various problems with discard. Because discard errors are ignored in 
osimage, these problems were not noticed.

Discard takes byte offsets, not block offsets, and multiple places were 
missing the multiplication with BlockSize.

The BLKDISCARD and BLKZEROOUT ioctls take start and length, not start 
and end.

unix.Fallocate already converts errno 0 to nil.

I manually tested that discard now works correctly in the installer.

Change-Id: I52d9e30a087bb6a792396baaefb2d7d09c43abfe
Reviewed-on: https://review.monogon.dev/c/monogon/+/2953
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
Vouch-Run-CI: Lorenz Brun <lorenz@monogon.tech>