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nfs41: cb_sequence xdr implementation 

[nfs41: get rid of READMEM and COPYMEM for callback_xdr.c]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: get rid of READ64 in callback_xdr.c]
See http://linux-nfs.org/pipermail/pnfs/2009-June/007846.html
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Benny Halevy 2009-04-01 09:23:26 -04:00
parent d49433e1e3
commit 4aece6a19c
1 changed files with 170 additions and 2 deletions
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172
fs/nfs/callback_xdr.c
View File

@ -20,6 +20,11 @@
2 + 2 + 3 + 3)
#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
#if defined(CONFIG_NFS_V4_1)
#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
4 + 1 + 3)
#endif /* CONFIG_NFS_V4_1 */
#define NFSDBG_FACILITY NFSDBG_CALLBACK
typedef __be32 (*callback_process_op_t)(void *, void *);
@ -207,6 +212,122 @@ out:
return status;
}
#if defined(CONFIG_NFS_V4_1)
static unsigned decode_sessionid(struct xdr_stream *xdr,
struct nfs4_sessionid *sid)
{
uint32_t *p;
int len = NFS4_MAX_SESSIONID_LEN;
p = read_buf(xdr, len);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);;
memcpy(sid->data, p, len);
return 0;
}
static unsigned decode_rc_list(struct xdr_stream *xdr,
struct referring_call_list *rc_list)
{
uint32_t *p;
int i;
unsigned status;
status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
if (status)
goto out;
status = htonl(NFS4ERR_RESOURCE);
p = read_buf(xdr, sizeof(uint32_t));
if (unlikely(p == NULL))
goto out;
rc_list->rcl_nrefcalls = ntohl(*p++);
if (rc_list->rcl_nrefcalls) {
p = read_buf(xdr,
rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
if (unlikely(p == NULL))
goto out;
rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls *
sizeof(*rc_list->rcl_refcalls),
GFP_KERNEL);
if (unlikely(rc_list->rcl_refcalls == NULL))
goto out;
for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
}
}
status = 0;
out:
return status;
}
static unsigned decode_cb_sequence_args(struct svc_rqst *rqstp,
struct xdr_stream *xdr,
struct cb_sequenceargs *args)
{
uint32_t *p;
int i;
unsigned status;
status = decode_sessionid(xdr, &args->csa_sessionid);
if (status)
goto out;
status = htonl(NFS4ERR_RESOURCE);
p = read_buf(xdr, 5 * sizeof(uint32_t));
if (unlikely(p == NULL))
goto out;
args->csa_addr = svc_addr_in(rqstp);
args->csa_sequenceid = ntohl(*p++);
args->csa_slotid = ntohl(*p++);
args->csa_highestslotid = ntohl(*p++);
args->csa_cachethis = ntohl(*p++);
args->csa_nrclists = ntohl(*p++);
args->csa_rclists = NULL;
if (args->csa_nrclists) {
args->csa_rclists = kmalloc(args->csa_nrclists *
sizeof(*args->csa_rclists),
GFP_KERNEL);
if (unlikely(args->csa_rclists == NULL))
goto out;
for (i = 0; i < args->csa_nrclists; i++) {
status = decode_rc_list(xdr, &args->csa_rclists[i]);
if (status)
goto out_free;
}
}
status = 0;
dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
"highestslotid %u cachethis %d nrclists %u\n",
__func__,
((u32 *)&args->csa_sessionid)[0],
((u32 *)&args->csa_sessionid)[1],
((u32 *)&args->csa_sessionid)[2],
((u32 *)&args->csa_sessionid)[3],
args->csa_sequenceid, args->csa_slotid,
args->csa_highestslotid, args->csa_cachethis,
args->csa_nrclists);
out:
dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
return status;
out_free:
for (i = 0; i < args->csa_nrclists; i++)
kfree(args->csa_rclists[i].rcl_refcalls);
kfree(args->csa_rclists);
goto out;
}
#endif /* CONFIG_NFS_V4_1 */
static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
{
__be32 *p;
@ -358,12 +479,52 @@ out:
#if defined(CONFIG_NFS_V4_1)
static unsigned encode_sessionid(struct xdr_stream *xdr,
const struct nfs4_sessionid *sid)
{
uint32_t *p;
int len = NFS4_MAX_SESSIONID_LEN;
p = xdr_reserve_space(xdr, len);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
memcpy(p, sid, len);
return 0;
}
static unsigned encode_cb_sequence_res(struct svc_rqst *rqstp,
struct xdr_stream *xdr,
const struct cb_sequenceres *res)
{
uint32_t *p;
unsigned status = res->csr_status;
if (unlikely(status != 0))
goto out;
encode_sessionid(xdr, &res->csr_sessionid);
p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*p++ = htonl(res->csr_sequenceid);
*p++ = htonl(res->csr_slotid);
*p++ = htonl(res->csr_highestslotid);
*p++ = htonl(res->csr_target_highestslotid);
out:
dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
return status;
}
static __be32
preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
{
switch (op_nr) {
case OP_CB_GETATTR:
case OP_CB_RECALL:
case OP_CB_SEQUENCE:
*op = &callback_ops[op_nr];
break;
@ -374,7 +535,6 @@ preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
case OP_CB_RECALL_ANY:
case OP_CB_RECALLABLE_OBJ_AVAIL:
case OP_CB_RECALL_SLOT:
case OP_CB_SEQUENCE:
case OP_CB_WANTS_CANCELLED:
case OP_CB_NOTIFY_LOCK:
return htonl(NFS4ERR_NOTSUPP);
@ -512,7 +672,15 @@ static struct callback_op callback_ops[] = {
.process_op = (callback_process_op_t)nfs4_callback_recall,
.decode_args = (callback_decode_arg_t)decode_recall_args,
.res_maxsize = CB_OP_RECALL_RES_MAXSZ,
}
},
#if defined(CONFIG_NFS_V4_1)
[OP_CB_SEQUENCE] = {
.process_op = (callback_process_op_t)nfs4_callback_sequence,
.decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
.encode_res = (callback_encode_res_t)encode_cb_sequence_res,
.res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
},
#endif /* CONFIG_NFS_V4_1 */
};
/*