Commit c3fad1b1 authored by Andy Adamson's avatar Andy Adamson Committed by Benny Halevy
Browse files

nfs41: add session reset to state manager 



Move the code to reset a session from the session_reclaimer to the
nfs4_state_manager.  Destroy the session, and create a new one. Treat
NFS4ERR_BADSESSION and NFS4ERR_DEADSESSION as a successful
nfs4_proc_destroy_session. Signal nfs4_proc_create_session that this is a
session reset so that the session slot table is re-used.

If the clientid is stale, set both NFS4CLNT_LEASE_EXPIRED and
NFS4CLNT_SESSION_SETUP bits and retry.

Use a switch statement in nfs4_session_recovery_handle_error for future
patche which will add handling for other errors.

Signed-off-by: default avatarAndy Adamson <andros@netapp.com>
Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>

[nfs41: session reset in nfs4_recovery_handle_error]
Signed-off-by: default avatarAndy Adamson <andros@netapp.com>
[nfs41: reset session on nfs4_do_reclaim session reset error]
    If nfs4_do_reclaim gets a session reset error, nfs4_recovery_handle_error
    will set the NFS4CLNT_SESSION_SETUP bit, and the state manager should
    continue processing to reset the session.
Signed-off-by: default avatarAndy Adamson <andros@netapp.com>
Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
[move nfs4_proc_destroy_session declaration here]
Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 76db6d95

fs/nfs/nfs4_fs.h

+1 −0
Original line number Diff line number Diff line
@@ -210,6 +210,7 @@ extern int nfs4_setup_sequence(struct nfs_client *clp, 
extern void nfs4_destroy_session(struct nfs4_session *session);

extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);

extern int nfs4_proc_create_session(struct nfs_client *, int reset);

extern int nfs4_proc_destroy_session(struct nfs4_session *);

#else /* CONFIG_NFS_v4_1 */

static inline int nfs4_setup_sequence(struct nfs_client *clp,

		struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,

fs/nfs/nfs4state.c

+49 −2
Original line number Diff line number Diff line
@@ -1042,6 +1042,14 @@ static void nfs4_recovery_handle_error(struct nfs_client *clp, int error) 
		case -NFS4ERR_EXPIRED:

			set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);

			nfs4_state_start_reclaim_nograce(clp);

		case -NFS4ERR_BADSESSION:

		case -NFS4ERR_BADSLOT:

		case -NFS4ERR_BAD_HIGH_SLOT:

		case -NFS4ERR_DEADSESSION:

		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:

		case -NFS4ERR_SEQ_FALSE_RETRY:

		case -NFS4ERR_SEQ_MISORDERED:

			set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);

	}

}
@@ -1114,6 +1122,36 @@ static int nfs4_reclaim_lease(struct nfs_client *clp) 
}



#ifdef CONFIG_NFS_V4_1

static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err)

{

	switch (err) {

	case -NFS4ERR_STALE_CLIENTID:

		set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);

		set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);

	}

}



static int nfs4_reset_session(struct nfs_client *clp)

{

	int status;



	status = nfs4_proc_destroy_session(clp->cl_session);

	if (status && status != -NFS4ERR_BADSESSION &&

	    status != -NFS4ERR_DEADSESSION) {

		nfs4_session_recovery_handle_error(clp, status);

		goto out;

	}



	memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);

	status = nfs4_proc_create_session(clp, 1);

	if (status)

		nfs4_session_recovery_handle_error(clp, status);

		/* fall through*/

out:

	/* Wake up the next rpc task even on error */

	rpc_wake_up_next(&clp->cl_session->fc_slot_table.slot_tbl_waitq);

	return status;

}



static int nfs4_initialize_session(struct nfs_client *clp)

{
@@ -1131,6 +1169,7 @@ static int nfs4_initialize_session(struct nfs_client *clp) 
	return status;

}

#else /* CONFIG_NFS_V4_1 */

static int nfs4_reset_session(struct nfs_client *clp) { return 0; }

static int nfs4_initialize_session(struct nfs_client *clp) { return 0; }

#endif /* CONFIG_NFS_V4_1 */
@@ -1160,10 +1199,13 @@ static void nfs4_state_manager(struct nfs_client *clp) 
			if (status != 0)

				continue;

		}

		/* Setup the session */

		/* Initialize or reset the session */

		if (nfs4_has_session(clp) &&

		   test_and_clear_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) {

			if (clp->cl_cons_state == NFS_CS_SESSION_INITING)

				status = nfs4_initialize_session(clp);

			else

				status = nfs4_reset_session(clp);

			if (status) {

				if (status == -NFS4ERR_STALE_CLIENTID)

					continue;
@@ -1175,6 +1217,8 @@ static void nfs4_state_manager(struct nfs_client *clp) 
			status = nfs4_do_reclaim(clp, &nfs4_reboot_recovery_ops);

			if (status == -NFS4ERR_STALE_CLIENTID)

				continue;

			if (test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state))

				continue;

			nfs4_state_end_reclaim_reboot(clp);

			continue;

		}
@@ -1188,6 +1232,9 @@ static void nfs4_state_manager(struct nfs_client *clp) 
					continue;

				if (status == -NFS4ERR_EXPIRED)

					continue;

				if (test_bit(NFS4CLNT_SESSION_SETUP,

								&clp->cl_state))

					continue;

				goto out_error;

			} else

				nfs4_state_end_reclaim_nograce(clp);

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