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nfs41: sequence operation
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Implement the sequence operation conforming to
http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-26

Check returned sessionid, slotid and slot sequenceid in decode_sequence.

If the server returns different values for sessionID, slotID or slot sequence
number than what was sent, the server is looney tunes.

Pass the sequence operation status to nfs41_sequence_done in order to
determine when to increment the slot sequence ID.

Free slot is separated from sequence done.

Signed-off-by: Rahul Iyer <iyer@netapp.com>
Signed-off-by: Ricardo Labiaga <ricardo.labiaga@netapp.com>
Signed-off-by: Andy Adamson<andros@umich.edu>
[nfs41: sequence res use slotid]
Signed-off-by: Andy Adamson <andros@netapp.com>
[nfs41: deref slot table in decode_sequence only for minorversion!=0]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: nfs4_call_sync]
[nfs41: remove SEQ4_STATUS_USE_TK_STATUS]
[nfs41: return ESERVERFAULT in decode_sequence]
[no sr_session, no sr_flags]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: use nfs4_call_sync_sequence to renew session lease]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: remove nfs4_call_sync_sequence forward definition]
Signed-off-by: Andy Adamson <andros@netapp.com>
[nfs41: use struct nfs_client for nfs41_proc_async_sequence]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: pass *session in seq_args and seq_res]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41 nfs41_sequence_call_done update error checking]
[nfs41 nfs41_sequence_done update error checking]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: remove switch on error from nfs41_sequence_call_done]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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Andy Adamson authored and Benny Halevy committed Jun 17, 2009
1 parent 8328d59 commit fc01cea
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Showing 2 changed files with 214 additions and 5 deletions.
92 changes: 92 additions & 0 deletions fs/nfs/nfs4proc.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -4567,6 +4567,98 @@ int nfs4_proc_destroy_session(struct nfs4_session *session)
return status;
}

/*
* Renew the cl_session lease.
*/
static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
{
struct nfs4_sequence_args args;
struct nfs4_sequence_res res;

struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
.rpc_argp = &args,
.rpc_resp = &res,
.rpc_cred = cred,
};

args.sa_cache_this = 0;

return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
&res, 0);
}

void nfs41_sequence_call_done(struct rpc_task *task, void *data)
{
struct nfs_client *clp = (struct nfs_client *)data;

nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);

if (task->tk_status < 0) {
dprintk("%s ERROR %d\n", __func__, task->tk_status);

if (_nfs4_async_handle_error(task, NULL, clp, NULL)
== -EAGAIN) {
rpc_restart_call(task);
return;
}
}
nfs41_sequence_free_slot(clp, task->tk_msg.rpc_resp);
dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);

put_rpccred(task->tk_msg.rpc_cred);
kfree(task->tk_msg.rpc_argp);
kfree(task->tk_msg.rpc_resp);

dprintk("<-- %s\n", __func__);
}

static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
{
struct nfs_client *clp;
struct nfs4_sequence_args *args;
struct nfs4_sequence_res *res;

clp = (struct nfs_client *)data;
args = task->tk_msg.rpc_argp;
res = task->tk_msg.rpc_resp;

if (nfs4_setup_sequence(clp, args, res, 0, task))
return;
rpc_call_start(task);
}

static const struct rpc_call_ops nfs41_sequence_ops = {
.rpc_call_done = nfs41_sequence_call_done,
.rpc_call_prepare = nfs41_sequence_prepare,
};

static int nfs41_proc_async_sequence(struct nfs_client *clp,
struct rpc_cred *cred)
{
struct nfs4_sequence_args *args;
struct nfs4_sequence_res *res;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
.rpc_cred = cred,
};

args = kzalloc(sizeof(*args), GFP_KERNEL);
if (!args)
return -ENOMEM;
res = kzalloc(sizeof(*res), GFP_KERNEL);
if (!res) {
kfree(args);
return -ENOMEM;
}
res->sr_slotid = NFS4_MAX_SLOT_TABLE;
msg.rpc_argp = args;
msg.rpc_resp = res;

return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
&nfs41_sequence_ops, (void *)clp);
}

#endif /* CONFIG_NFS_V4_1 */

struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
Expand Down
127 changes: 122 additions & 5 deletions fs/nfs/nfs4xdr.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -296,8 +296,10 @@ static int nfs4_stat_to_errno(int);
decode_channel_attrs_maxsz)
#define encode_destroy_session_maxsz (op_encode_hdr_maxsz + 4)
#define decode_destroy_session_maxsz (op_decode_hdr_maxsz)
#define encode_sequence_maxsz 0 /* stub */
#define decode_sequence_maxsz 0 /* stub */
#define encode_sequence_maxsz (op_encode_hdr_maxsz + \
XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
#define decode_sequence_maxsz (op_decode_hdr_maxsz + \
XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
#else /* CONFIG_NFS_V4_1 */
#define encode_sequence_maxsz 0
#define decode_sequence_maxsz 0
Expand Down Expand Up @@ -661,6 +663,12 @@ static int nfs4_stat_to_errno(int);
encode_destroy_session_maxsz)
#define NFS4_dec_destroy_session_sz (compound_decode_hdr_maxsz + \
decode_destroy_session_maxsz)
#define NFS4_enc_sequence_sz \
(compound_decode_hdr_maxsz + \
encode_sequence_maxsz)
#define NFS4_dec_sequence_sz \
(compound_decode_hdr_maxsz + \
decode_sequence_maxsz)
#define NFS4_enc_get_lease_time_sz (compound_encode_hdr_maxsz + \
encode_sequence_maxsz + \
encode_putrootfh_maxsz + \
Expand Down Expand Up @@ -1635,11 +1643,39 @@ static void encode_sequence(struct xdr_stream *xdr,
{
#if defined(CONFIG_NFS_V4_1)
struct nfs4_session *session = args->sa_session;
struct nfs4_slot_table *tp;
struct nfs4_slot *slot;
__be32 *p;

if (!session)
return;

/* stub */
tp = &session->fc_slot_table;

WARN_ON(args->sa_slotid == NFS4_MAX_SLOT_TABLE);
slot = tp->slots + args->sa_slotid;

RESERVE_SPACE(4);
WRITE32(OP_SEQUENCE);

/*
* Sessionid + seqid + slotid + max slotid + cache_this
*/
dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
"max_slotid=%d cache_this=%d\n",
__func__,
((u32 *)session->sess_id.data)[0],
((u32 *)session->sess_id.data)[1],
((u32 *)session->sess_id.data)[2],
((u32 *)session->sess_id.data)[3],
slot->seq_nr, args->sa_slotid,
tp->highest_used_slotid, args->sa_cache_this);
RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 16);
WRITEMEM(session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
WRITE32(slot->seq_nr);
WRITE32(args->sa_slotid);
WRITE32(tp->highest_used_slotid);
WRITE32(args->sa_cache_this);
hdr->nops++;
hdr->replen += decode_sequence_maxsz;
#endif /* CONFIG_NFS_V4_1 */
Expand Down Expand Up @@ -2390,6 +2426,24 @@ static int nfs4_xdr_enc_destroy_session(struct rpc_rqst *req, uint32_t *p,
return 0;
}

/*
* a SEQUENCE request
*/
static int nfs4_xdr_enc_sequence(struct rpc_rqst *req, uint32_t *p,
struct nfs4_sequence_args *args)
{
struct xdr_stream xdr;
struct compound_hdr hdr = {
.minorversion = nfs4_xdr_minorversion(args),
};

xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_compound_hdr(&xdr, req, &hdr);
encode_sequence(&xdr, args, &hdr);
encode_nops(&hdr);
return 0;
}

/*
* a GET_LEASE_TIME request
*/
Expand Down Expand Up @@ -4236,13 +4290,58 @@ static int decode_sequence(struct xdr_stream *xdr,
struct rpc_rqst *rqstp)
{
#if defined(CONFIG_NFS_V4_1)
struct nfs4_slot *slot;
struct nfs4_sessionid id;
u32 dummy;
int status;
__be32 *p;

if (!res->sr_session)
return 0;

/* stub */
#endif /* CONFIG_NFS_V4_1 */
status = decode_op_hdr(xdr, OP_SEQUENCE);
if (status)
goto out_err;

/*
* If the server returns different values for sessionID, slotID or
* sequence number, the server is looney tunes.
*/
status = -ESERVERFAULT;

slot = &res->sr_session->fc_slot_table.slots[res->sr_slotid];
READ_BUF(NFS4_MAX_SESSIONID_LEN + 20);
COPYMEM(id.data, NFS4_MAX_SESSIONID_LEN);
if (memcmp(id.data, res->sr_session->sess_id.data,
NFS4_MAX_SESSIONID_LEN)) {
dprintk("%s Invalid session id\n", __func__);
goto out_err;
}
/* seqid */
READ32(dummy);
if (dummy != slot->seq_nr) {
dprintk("%s Invalid sequence number\n", __func__);
goto out_err;
}
/* slot id */
READ32(dummy);
if (dummy != res->sr_slotid) {
dprintk("%s Invalid slot id\n", __func__);
goto out_err;
}
/* highest slot id - currently not processed */
READ32(dummy);
/* target highest slot id - currently not processed */
READ32(dummy);
/* result flags - currently not processed */
READ32(dummy);
status = 0;
out_err:
res->sr_status = status;
return status;
#else /* CONFIG_NFS_V4_1 */
return 0;
#endif /* CONFIG_NFS_V4_1 */
}

/*
Expand Down Expand Up @@ -5180,6 +5279,23 @@ static int nfs4_xdr_dec_destroy_session(struct rpc_rqst *rqstp, uint32_t *p,
return status;
}

/*
* a SEQUENCE request
*/
static int nfs4_xdr_dec_sequence(struct rpc_rqst *rqstp, uint32_t *p,
struct nfs4_sequence_res *res)
{
struct xdr_stream xdr;
struct compound_hdr hdr;
int status;

xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
status = decode_compound_hdr(&xdr, &hdr);
if (!status)
status = decode_sequence(&xdr, res, rqstp);
return status;
}

/*
* a GET_LEASE_TIME request
*/
Expand Down Expand Up @@ -5375,6 +5491,7 @@ struct rpc_procinfo nfs4_procedures[] = {
PROC(EXCHANGE_ID, enc_exchange_id, dec_exchange_id),
PROC(CREATE_SESSION, enc_create_session, dec_create_session),
PROC(DESTROY_SESSION, enc_destroy_session, dec_destroy_session),
PROC(SEQUENCE, enc_sequence, dec_sequence),
PROC(GET_LEASE_TIME, enc_get_lease_time, dec_get_lease_time),
#endif /* CONFIG_NFS_V4_1 */
};
Expand Down

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