From: "J. Bruce Fields" <bfields-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Al Viro <viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
Cc: linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Subject: Provide vfs support for NFSv4 delegations
Date: Fri, 3 Feb 2012 16:09:51 -0500 [thread overview]
Message-ID: <1328303397-3872-1-git-send-email-bfields@redhat.com> (raw)
In-Reply-To: <20120203205818.GE2999-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
The following patches provide vfs support for NFSv4 delegations.
If they look sane then I'd like to get some version of them merged into
3.4. I'm assuming Al would be the one to do that.
Currently nfsd implements delegations as leases. However, leases don't
have quite the same semantics, which means that delegations are
currently enforced correctly only for conflicts between NFSv4 clients.
So, I define a new FL_DELEG flag to mark NFSv4 delegations. In most
respects delegations behave just like leases, but they need to be broken
on more operations.
Delegations aren't exposed to userspace; nfsd is the only user.
In theory this code allows both read and write delegations, but I'm only
using read delegations for now--write delegations are a project for
another day. (At which point write leases will probably need some
fixing too, while we're at it.)
--b.
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next prev parent reply other threads:[~2012-02-03 21:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-17 16:00 [RFC PATCH 0/6] Fix NFSv4 delegations J. Bruce Fields
2012-01-17 16:00 ` [RFC PATCH 2/6] locks: give break_lease its own flags J. Bruce Fields
[not found] ` <1326816029-13913-3-git-send-email-bfields-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-01-17 16:17 ` Bypass encrypt and decrypt data in dm-crypt Fan Zhang
[not found] ` <1326816029-13913-1-git-send-email-bfields-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-01-17 16:00 ` [RFC PATCH 1/6] locks: introduce new FL_DELEG lock flag J. Bruce Fields
2012-01-17 16:00 ` [RFC PATCH 3/6] locks: break delegations on unlink J. Bruce Fields
2012-01-17 16:00 ` [RFC PATCH 6/6] locks: break delegations on link J. Bruce Fields
2012-01-17 16:00 ` [RFC PATCH 4/6] locks: break delegations on rename J. Bruce Fields
2012-01-17 16:00 ` [RFC PATCH 5/6] locks: break delegations on any attribute modification J. Bruce Fields
2012-02-03 20:58 ` [RFC PATCH 0/6] Fix NFSv4 delegations J. Bruce Fields
2012-02-03 21:09 ` [PATCH 1/6] locks: introduce new FL_DELEG lock flag J. Bruce Fields
2012-02-03 21:09 ` [PATCH 4/6] locks: break delegations on rename J. Bruce Fields
2012-02-03 21:09 ` [PATCH 5/6] locks: break delegations on any attribute modification J. Bruce Fields
[not found] ` <20120203205818.GE2999-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2012-02-03 21:09 ` J. Bruce Fields [this message]
2012-02-03 21:09 ` [PATCH 2/6] locks: give break_lease its own flags J. Bruce Fields
2012-02-03 21:09 ` [PATCH 3/6] locks: break delegations on unlink J. Bruce Fields
2012-02-03 21:09 ` [PATCH 6/6] locks: break delegations on link J. Bruce Fields
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