On 1 Apr 2016, at 08:43, Paolo Bonzini <pbonz...@redhat.com> wrote: > > On 31/03/2016 22:17, Alex Bligh wrote: >>>> In qemu, read+FUA just triggers blk_co_flush() prior to reading; but >>>> that's the same function it calls for write+FUA. >> That's harmless, but unnecessary in the sense that current documented >> behaviour doesn't require it. Perhaps it should? >> >> I suppose TRIM etc. should support FUA too? > > TRIM is an advisory operation, so it doesn't make sense to force access > to the medium.
Reflecting, that's correct. FUA can't mean anything sensible for TRIM. -- Alex Bligh
