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NFSv4: Fix a hang in OPEN related to server reboot

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If the server fails to return the attributes as part of an OPEN
reply, and then reboots, we can end up hanging. The reason is that
the client attempts to send a GETATTR in order to pick up the
missing OPEN call, but fails to release the slot first, causing
reboot recovery to deadlock.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Fixes: 2e80dbe7ac ("NFSv4.1: Close callback races for OPEN, LAYOUTGET...")
Cc: stable@vger.kernel.org # v4.8+
This commit is contained in:
Trond Myklebust 2017-04-15 19:20:01 -04:00
parent fbe77c30e9
commit 56e0d71ef1
1 changed files with 3 additions and 1 deletions
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4
fs/nfs/nfs4proc.c
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@ -2300,8 +2300,10 @@ static int _nfs4_proc_open(struct nfs4_opendata *data)
if (status != 0)
return status;
}
if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
nfs4_sequence_free_slot(&o_res->seq_res);
nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
}
return 0;
}