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file-posix: probe discard alignment on Linux block devices

Stefan Hajnoczirequested to merge
stefanha/centos-stream-qemu-kvm:86032-discard-granularity-c9s into c9s

Merge Request Required Information

JIRA: https://issues.redhat.com/browse/RHEL-86032
Signed-off-by: Stefan Hajnoczi stefanha@redhat.com

Summary of Changes

When the guest's discard_granularity does not match the host, discard request failure stops the guest with werror=stop. These patches relax QEMU's handling of misaligned portions of discard requests to prevent disrupting guests. After all, discard is a best effort operation so there is not much harm in ignoring misaligned portions of requests.

Approved Development Ticket(s)

Resolves: RHEL-86032

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