Re: Making linkat() able to overwrite the target

[David Howells]

Omar Sandoval <osandov@xxxxxxxxxxx> wrote:

> Yes I still have those patches lying around and I'd be happy to dust
> them off and resend them.

That would be great if you could.  I could use them here:

	https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=fscache-iter

I'm performing invalidation by creating a vfs_tmpfile() and then replacing the
on-disk file whilst letting ops resume on the temporary file.  Replacing the
on-disk file currently, however, involves unlinking the old one before I can
link in a new one - which leaves a window in which nothing is there.  I could
use one or more side dirs in which to create new files and rename them over,
but that has potential lock bottleneck issues - and is particularly fun if an
entire volume is invalidated (e.g. AFS vos release).

David