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NFSv4.1 handle ERR_DELAY error reclaiming locking state on delegation recall

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[ Upstream commit 3d7a9520f0 ]

A client should be able to handle getting an ERR_DELAY error
while doing a LOCK call to reclaim state due to delegation being
recalled. This is a transient error that can happen due to server
moving its volumes and invalidating its file location cache and
upon reference to it during the LOCK call needing to do an
expensive lookup (leading to an ERR_DELAY error on a PUTFH).

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Olga Kornievskaia
2020-08-20 18:52:43 -04:00
committed by Greg Kroah-Hartman
parent 931f10b04b
commit c642341b09
1 changed files with 6 additions and 1 deletions
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7
fs/nfs/nfs4proc.c
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@@ -7006,7 +7006,12 @@ int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state,
err = nfs4_set_lock_state(state, fl);
if (err != 0)
return err;
err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
do {
err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
if (err != -NFS4ERR_DELAY)
break;
ssleep(1);
} while (err == -NFS4ERR_DELAY);
return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
}