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authorAlexandros Batsakis <batsakis@netapp.com>2009-12-14 21:27:56 -0800
committerTrond Myklebust <Trond.Myklebust@netapp.com>2009-12-15 13:55:18 -0500
commit689cf5c15baf603a8041565ff0bd0d65d1634fd7 (patch)
tree83fc6e666f0c099486cfcdb41b40c02d9fa163b7 /fs/nfs/nfs4proc.c
parentcf3b01b54880debb01ea7d471123da5887a7c2cb (diff)
downloadop-kernel-dev-689cf5c15baf603a8041565ff0bd0d65d1634fd7.zip
op-kernel-dev-689cf5c15baf603a8041565ff0bd0d65d1634fd7.tar.gz
nfs: enforce FIFO ordering of operations trying to acquire slot
Signed-off-by: Alexandros Batsakis <batsakis@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/nfs4proc.c')
-rw-r--r--fs/nfs/nfs4proc.c22
1 files changed, 18 insertions, 4 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index acd698b..02513da 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -346,8 +346,12 @@ nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
*/
static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
{
+ struct rpc_task *task;
+
if (!test_bit(NFS4CLNT_SESSION_DRAINING, &ses->clp->cl_state)) {
- rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
+ task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
+ if (task)
+ rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
return;
}
@@ -483,6 +487,14 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
return -EAGAIN;
}
+ if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
+ !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
+ rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
+ spin_unlock(&tbl->slot_tbl_lock);
+ dprintk("%s enforce FIFO order\n", __func__);
+ return -EAGAIN;
+ }
+
slotid = nfs4_find_slot(tbl);
if (slotid == NFS4_MAX_SLOT_TABLE) {
rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
@@ -492,6 +504,7 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
}
spin_unlock(&tbl->slot_tbl_lock);
+ rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
slot = tbl->slots + slotid;
args->sa_session = session;
args->sa_slotid = slotid;
@@ -4401,11 +4414,12 @@ static void nfs4_get_lease_time_prepare(struct rpc_task *task,
(struct nfs4_get_lease_time_data *)calldata;
dprintk("--> %s\n", __func__);
+ rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
/* just setup sequence, do not trigger session recovery
since we're invoked within one */
ret = nfs41_setup_sequence(data->clp->cl_session,
- &data->args->la_seq_args,
- &data->res->lr_seq_res, 0, task);
+ &data->args->la_seq_args,
+ &data->res->lr_seq_res, 0, task);
BUG_ON(ret == -EAGAIN);
rpc_call_start(task);
@@ -4625,7 +4639,7 @@ struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
tbl = &session->fc_slot_table;
tbl->highest_used_slotid = -1;
spin_lock_init(&tbl->slot_tbl_lock);
- rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
+ rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
tbl = &session->bc_slot_table;
tbl->highest_used_slotid = -1;
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