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nfs: enforce FIFO ordering of operations trying to acquire slot

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Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Alexandros Batsakis 2009-12-14 21:27:56 -08:00 • committed by Trond Myklebust
parent cf3b01b548
commit 689cf5c15b
3 changed files with 35 additions and 6 deletions
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18
fs/nfs/nfs4state.c
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@ -138,8 +138,22 @@ static int nfs41_setup_state_renewal(struct nfs_client *clp)
static void nfs41_end_drain_session(struct nfs_client *clp,
struct nfs4_session *ses)
{
if (test_and_clear_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state))
rpc_wake_up(&ses->fc_slot_table.slot_tbl_waitq);
int max_slots;
if (test_and_clear_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state)) {
spin_lock(&ses->fc_slot_table.slot_tbl_lock);
max_slots = ses->fc_slot_table.max_slots;
while (max_slots--) {
struct rpc_task *task;
task = rpc_wake_up_next(&ses->fc_slot_table.
slot_tbl_waitq);
if (!task)
break;
rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
}
spin_unlock(&ses->fc_slot_table.slot_tbl_lock);
}
}
static int nfs41_begin_drain_session(struct nfs_client *clp,