| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.4 094/214] NFSv4.1: Handle NFS4ERR_DELAY when resetting the NFSv4.1 session | Date | Wed, 4 Jun 2014 21:17:37 -0700 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Trond Myklebust <Trond.Myklebust@netapp.com>
commit c489ee290bdbbace6bb63ebe6ebd4dd605819495 upstream.
NFS4ERR_DELAY is a legal reply when we call DESTROY_SESSION. It usually means that the server is busy handling an unfinished RPC request. Just sleep for a second and then retry. We also need to be able to handle the NFS4ERR_BACK_CHAN_BUSY return value. If the NFS server has outstanding callbacks, we just want to similarly sleep & retry.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Cc: Rui Xiang <rui.xiang@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/nfs/nfs4state.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-)
--- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -1651,8 +1651,18 @@ static int nfs4_reset_session(struct nfs nfs4_begin_drain_session(clp); status = nfs4_proc_destroy_session(clp->cl_session); - if (status && status != -NFS4ERR_BADSESSION && - status != -NFS4ERR_DEADSESSION) { + switch (status) { + case 0: + case -NFS4ERR_BADSESSION: + case -NFS4ERR_DEADSESSION: + break; + case -NFS4ERR_BACK_CHAN_BUSY: + case -NFS4ERR_DELAY: + set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); + status = 0; + ssleep(1); + goto out; + default: status = nfs4_recovery_handle_error(clp, status); goto out; }
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