Re: Volatile write caches on macOS and Windows, redux

[Peter Eisentraut]

On 25.05.24 04:01, Jelte Fennema-Nio wrote:

Is this the only reason why you're suggesting adding fsync=full,
instead of simply always setting F_FULLFSYNC when fsync=true on MacOS.
If so, I'm not sure we really gain anything by this tri-state. I think
people either care about data loss on power loss, or they don't. I
doubt many people want his third intermediate option, which afaict
basically means lose data on powerloss less often than fsync=false but
still lose data most of the time.

I agree, two states should be enough.  It could basically just be

pg_fsync(int fd)
{
#if macos
    fcntl(fd, F_FULLFSYNC);
#else
    fsync(fd);
#endif
}