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nfs41: Don't clear DRAINING flag on NFS4ERR_STALE_CLIENTID

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If CREATE_SESSION fails with NFS4ERR_STALE_CLIENTID, don't clear the
NFS4CLNT_SESSION_DRAINING flag and don't wake RPCs waiting for the
session to be reestablished.  We don't have a session yet, so there
is no reason to wake other RPCs.

This avoids sending spurious compounds with bogus sequenceID during
session and state recovery.

Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
[Trond.Myklebust@netapp.com: cleaned up patch by adding the
                             nfs41_begin/end_drain_session() helpers]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Ricardo Labiaga 2009-12-06 12:57:34 -05:00 committed by Trond Myklebust
parent 9430fb6b53
commit 9dfdf404c9
2 changed files with 43 additions and 18 deletions
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2
fs/nfs/nfs4proc.c
View file

@ -4586,10 +4586,12 @@ struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
init_completion(&session->complete);
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");
tbl = &session->bc_slot_table;
tbl->highest_used_slotid = -1;
spin_lock_init(&tbl->slot_tbl_lock);
rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");

59
fs/nfs/nfs4state.c
View file

@ -135,16 +135,43 @@ static int nfs41_setup_state_renewal(struct nfs_client *clp)
return status;
}
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);
}
static int nfs41_begin_drain_session(struct nfs_client *clp,
struct nfs4_session *ses)
{
struct nfs4_slot_table *tbl = &ses->fc_slot_table;
spin_lock(&tbl->slot_tbl_lock);
set_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state);
if (tbl->highest_used_slotid != -1) {
INIT_COMPLETION(ses->complete);
spin_unlock(&tbl->slot_tbl_lock);
return wait_for_completion_interruptible(&ses->complete);
}
spin_unlock(&tbl->slot_tbl_lock);
return 0;
}
int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
{
int status;
status = nfs41_begin_drain_session(clp, clp->cl_session);
if (status != 0)
goto out;
status = nfs4_proc_exchange_id(clp, cred);
if (status != 0)
goto out;
status = nfs4_proc_create_session(clp);
if (status != 0)
goto out;
nfs41_end_drain_session(clp, clp->cl_session);
nfs41_setup_state_renewal(clp);
nfs_mark_client_ready(clp, NFS_CS_READY);
out:
@ -1239,20 +1266,11 @@ static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err)
static int nfs4_reset_session(struct nfs_client *clp)
{
struct nfs4_session *ses = clp->cl_session;
struct nfs4_slot_table *tbl = &ses->fc_slot_table;
int status;
spin_lock(&tbl->slot_tbl_lock);
set_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state);
if (tbl->highest_used_slotid != -1) {
INIT_COMPLETION(ses->complete);
spin_unlock(&tbl->slot_tbl_lock);
status = wait_for_completion_interruptible(&ses->complete);
if (status) /* -ERESTARTSYS */
goto out;
} else {
spin_unlock(&tbl->slot_tbl_lock);
}
status = nfs41_begin_drain_session(clp, ses);
if (status != 0)
return status;
status = nfs4_proc_destroy_session(clp->cl_session);
if (status && status != -NFS4ERR_BADSESSION &&
@ -1265,13 +1283,18 @@ static int nfs4_reset_session(struct nfs_client *clp)
status = nfs4_proc_create_session(clp);
if (status)
nfs4_session_recovery_handle_error(clp, status);
/* fall through*/
out:
/* Wake up the next rpc task even on error */
clear_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state);
rpc_wake_up(&clp->cl_session->fc_slot_table.slot_tbl_waitq);
if (status == 0)
nfs41_setup_state_renewal(clp);
/*
* Let the state manager reestablish state
* without waking other tasks yet.
*/
if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
/* Wake up the next rpc task */
nfs41_end_drain_session(clp, ses);
if (status == 0)
nfs41_setup_state_renewal(clp);
}
return status;
}