From: "J. Bruce Fields" <bfields@redhat.com>
To: Trond Myklebust <trondmy@hammerspace.com>,
Anna Schumaker <schumakeranna@gmail.com>
Cc: daire@dneg.com, linux-nfs@vger.kernel.org,
"J. Bruce Fields" <bfields@redhat.com>
Subject: [PATCH 0/3] reexport lock fixes
Date: Mon, 14 Jun 2021 10:48:15 -0400 [thread overview]
Message-ID: <1623682098-13236-1-git-send-email-bfields@redhat.com> (raw)
From: "J. Bruce Fields" <bfields@redhat.com>
The following fix up some problems that can cause crashes or silently
broken lock guarantees in the reexport case.
Not fixed:
- Attempts to reclaim locks after a reboot of the reexport
server will fail. This at least seems like an improvement
over the current situation, which is that they'll succeed even
in cases where they shouldn't. Complete support for reboot
recovery is a bigger job.
- NFSv4.1+ lock nofications don't work. So, clients have to
poll as they do with NFSv4.0, which is suboptimal, but correct
(and an improvement over the current situation, which is a
kernel oops).
So what we have at this point is a suboptimal lock implementation that
doesn't support lock recovery.
Another alternative might be to turn off file locking entirely in the
re-export case. I'd rather take the incremental improvement and fix the
oopses.
--b.
J. Bruce Fields (3):
nfs: don't atempt blocking locks on nfs reexports
lockd: lockd server-side shouldn't set fl_ops
nfs: don't allow reexport reclaims
fs/lockd/svclock.c | 30 ++++++++++++------------------
fs/nfs/export.c | 2 +-
fs/nfs/file.c | 3 +++
fs/nfsd/nfs4state.c | 11 +++++++++--
fs/nfsd/nfsproc.c | 1 +
include/linux/exportfs.h | 2 ++
include/linux/fs.h | 1 +
7 files changed, 29 insertions(+), 21 deletions(-)
--
2.31.1
next reply other threads:[~2021-06-14 14:48 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-14 14:48 J. Bruce Fields [this message]
2021-06-14 14:48 ` [PATCH 1/3] nfs: don't atempt blocking locks on nfs reexports J. Bruce Fields
2021-06-14 14:48 ` [PATCH 2/3] lockd: lockd server-side shouldn't set fl_ops J. Bruce Fields
2021-06-14 14:48 ` [PATCH 3/3] nfs: don't allow reexport reclaims J. Bruce Fields
2021-06-14 14:56 ` Trond Myklebust
2021-06-14 19:34 ` J. Bruce Fields
2021-06-14 19:53 ` Trond Myklebust
2021-06-14 20:03 ` bfields
2021-06-14 21:03 ` Trond Myklebust
2021-07-22 14:34 ` bfields
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