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nfsd41: Backchannel: callback infrastructure 

Keep the xprt used for create_session in cl_cb_xprt.
Mark cl_callback.cb_minorversion = 1 and remember
the client provided cl_callback.cb_prog rpc program number.
Use it to probe the callback path.

Use the client's network address to initialize as the
callback's address as expected by the xprt creation
routines.

Define xdr sizes and code nfs4_cb_compound header to be able
to send a null callback rpc.

Signed-off-by: Andy Adamson<andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
[get callback minorversion from fore channel's]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfsd41: change bc_sock to bc_xprt]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[pulled definition for cl_cb_xprt]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfsd41: set up backchannel's cb_addr]
[moved rpc_create_args init to "nfsd: modify nfsd4.1 backchannel to use new xprt class"]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Andy Adamson 2009-09-10 12:25:59 +03:00 committed by J. Bruce Fields
parent 80fc015bdf
commit 38524ab38f
3 changed files with 32 additions and 2 deletions
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17
fs/nfsd/nfs4callback.c
View File

@ -43,6 +43,7 @@
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/state.h>
#include <linux/sunrpc/sched.h>
@ -52,16 +53,19 @@
#define NFSPROC4_CB_NULL 0
#define NFSPROC4_CB_COMPOUND 1
#define NFS4_STATEID_SIZE 16
/* Index of predefined Linux callback client operations */
enum {
NFSPROC4_CLNT_CB_NULL = 0,
NFSPROC4_CLNT_CB_RECALL,
NFSPROC4_CLNT_CB_SEQUENCE,
};
enum nfs_cb_opnum4 {
OP_CB_RECALL = 4,
OP_CB_SEQUENCE = 11,
};
#define NFS4_MAXTAGLEN 20
@ -70,15 +74,22 @@ enum nfs_cb_opnum4 {
#define NFS4_dec_cb_null_sz 0
#define cb_compound_enc_hdr_sz 4
#define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2))
#define sessionid_sz (NFS4_MAX_SESSIONID_LEN >> 2)
#define cb_sequence_enc_sz (sessionid_sz + 4 + \
1 /* no referring calls list yet */)
#define cb_sequence_dec_sz (op_dec_sz + sessionid_sz + 4)
#define op_enc_sz 1
#define op_dec_sz 2
#define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2))
#define enc_stateid_sz (NFS4_STATEID_SIZE >> 2)
#define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \
cb_sequence_enc_sz + \
1 + enc_stateid_sz + \
enc_nfs4_fh_sz)
#define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \
cb_sequence_dec_sz + \
op_dec_sz)
/*
@ -137,11 +148,13 @@ xdr_error: \
} while (0)
struct nfs4_cb_compound_hdr {
int status;
u32 ident;
/* args */
u32 ident; /* minorversion 0 only */
u32 nops;
__be32 *nops_p;
u32 minorversion;
/* res */
int status;
u32 taglen;
char *tag;
};

14
fs/nfsd/nfs4state.c
View File

@ -702,6 +702,8 @@ static inline void
free_client(struct nfs4_client *clp)
{
shutdown_callback_client(clp);
if (clp->cl_cb_xprt)
svc_xprt_put(clp->cl_cb_xprt);
if (clp->cl_cred.cr_group_info)
put_group_info(clp->cl_cred.cr_group_info);
kfree(clp->cl_principal);
@ -1317,6 +1319,18 @@ nfsd4_create_session(struct svc_rqst *rqstp,
cr_ses->flags &= ~SESSION4_PERSIST;
cr_ses->flags &= ~SESSION4_RDMA;
if (cr_ses->flags & SESSION4_BACK_CHAN) {
unconf->cl_cb_xprt = rqstp->rq_xprt;
svc_xprt_get(unconf->cl_cb_xprt);
rpc_copy_addr(
(struct sockaddr *)&unconf->cl_cb_conn.cb_addr,
sa);
unconf->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
unconf->cl_cb_conn.cb_minorversion =
cstate->minorversion;
unconf->cl_cb_conn.cb_prog = cr_ses->callback_prog;
nfsd4_probe_callback(unconf);
}
conf = unconf;
} else {
status = nfserr_stale_clientid;

3
include/linux/nfsd/state.h
View File

@ -211,6 +211,9 @@ struct nfs4_client {
struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */
u32 cl_exchange_flags;
struct nfs4_sessionid cl_sessionid;
/* for nfs41 callbacks */
struct svc_xprt *cl_cb_xprt; /* 4.1 callback transport */
};
/* struct nfs4_client_reset