Re: Linux 2.6.29

Jeff Garzik
2009-03-26T06:25:26Z

Kyle Moffett wrote:
> Really, I think virtually all of the database programs would be
> perfectly happy with an "fsbarrier(fd, flags)" syscall, where if "fd"
> points to a regular file or directory then it instructs the underlying
> filesystem to do whatever internal barrier it supports, and if not
> just fail with -ENOTSUPP (so you can fall back to fdatasync(), etc).
> Perhaps "flags" would allow a "data" or "metadata" barrier, but if not
> it's not a big issue.

If you want a per-fd barrier call, there is always sync_file_range(2)

> If a user-level tool needs to enforce ordering
> between IOs the only tool right now is is a full flush

or sync_file_range(2)...

Jeff