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NFSv4: Fix a hang in OPEN related to server reboot 

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;
}