David Howells wrote:
Nick Piggin <[email protected]> wrote:
No, you shouldn't. We could theoretically introduce a new API for this,
but I think it would be preferable if you can fix the race in the fs.
Actually, I might be able to do better.
When making a StoreData call to the AFS server, I send all the parameters
first, and at that point, the server will abort it, I think, if permission is
not available, and won't wait for the payload to be delivered.
So if I tell AF_RXRPC to send the parameter data with an explicit ACK request
and then wait till it's either hard-ACK'd or aborted, I should then be able to
deal with the permissions failure at a state where I have locked *all* the
pages to be sent.
At that point, I should be able to tell truncate to simple discard all these
locked pages.
How's that sound?
Truncate as it stands still needs to be given unlocked pages. So we would
either have to create a new API, or I think preferably it would be nice if
you could see if you can first solve it with a private lock?
--
SUSE Labs, Novell Inc.
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