Detect the need to increase buffer size on TrueNAS SCALE. #73
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Without this, we fail to fetch any attr larger than 1 KB.
Motivation: enable restic to back up Mac resource forks on NAS volumes. Currently, it loses data with only an easy-to-miss stderr message.
Unfortunately, TrueNAS doesn't document this difference anywhere, if indeed it's their fault, but it's empirically what happens. This is on an OpenZFS volume with the
xattr=sa
property.Thanks!