mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 17:59:32 +00:00
![Alexandros Batsakis](/assets/img/avatar_default.png)
This patch enables the use of the nfsv4.1 backchannel. Signed-off-by: Alexandros Batsakis <batsakis@netapp.com> [initialize rpc_create_args.bc_xprt too] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
750 lines
20 KiB
C
750 lines
20 KiB
C
/*
|
|
* linux/fs/nfsd/nfs4callback.c
|
|
*
|
|
* Copyright (c) 2001 The Regents of the University of Michigan.
|
|
* All rights reserved.
|
|
*
|
|
* Kendrick Smith <kmsmith@umich.edu>
|
|
* Andy Adamson <andros@umich.edu>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
|
|
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/list.h>
|
|
#include <linux/inet.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kthread.h>
|
|
#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>
|
|
#include <linux/nfs4.h>
|
|
#include <linux/sunrpc/xprtsock.h>
|
|
|
|
#define NFSDDBG_FACILITY NFSDDBG_PROC
|
|
|
|
#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
|
|
|
|
#define NFS4_enc_cb_null_sz 0
|
|
#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)
|
|
|
|
struct nfs4_rpc_args {
|
|
void *args_op;
|
|
struct nfsd4_cb_sequence args_seq;
|
|
};
|
|
|
|
/*
|
|
* Generic encode routines from fs/nfs/nfs4xdr.c
|
|
*/
|
|
static inline __be32 *
|
|
xdr_writemem(__be32 *p, const void *ptr, int nbytes)
|
|
{
|
|
int tmp = XDR_QUADLEN(nbytes);
|
|
if (!tmp)
|
|
return p;
|
|
p[tmp-1] = 0;
|
|
memcpy(p, ptr, nbytes);
|
|
return p + tmp;
|
|
}
|
|
|
|
#define WRITE32(n) *p++ = htonl(n)
|
|
#define WRITEMEM(ptr,nbytes) do { \
|
|
p = xdr_writemem(p, ptr, nbytes); \
|
|
} while (0)
|
|
#define RESERVE_SPACE(nbytes) do { \
|
|
p = xdr_reserve_space(xdr, nbytes); \
|
|
if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \
|
|
BUG_ON(!p); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Generic decode routines from fs/nfs/nfs4xdr.c
|
|
*/
|
|
#define DECODE_TAIL \
|
|
status = 0; \
|
|
out: \
|
|
return status; \
|
|
xdr_error: \
|
|
dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \
|
|
status = -EIO; \
|
|
goto out
|
|
|
|
#define READ32(x) (x) = ntohl(*p++)
|
|
#define READ64(x) do { \
|
|
(x) = (u64)ntohl(*p++) << 32; \
|
|
(x) |= ntohl(*p++); \
|
|
} while (0)
|
|
#define READTIME(x) do { \
|
|
p++; \
|
|
(x.tv_sec) = ntohl(*p++); \
|
|
(x.tv_nsec) = ntohl(*p++); \
|
|
} while (0)
|
|
#define READ_BUF(nbytes) do { \
|
|
p = xdr_inline_decode(xdr, nbytes); \
|
|
if (!p) { \
|
|
dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \
|
|
__func__, __LINE__); \
|
|
return -EIO; \
|
|
} \
|
|
} while (0)
|
|
|
|
struct nfs4_cb_compound_hdr {
|
|
/* args */
|
|
u32 ident; /* minorversion 0 only */
|
|
u32 nops;
|
|
__be32 *nops_p;
|
|
u32 minorversion;
|
|
/* res */
|
|
int status;
|
|
u32 taglen;
|
|
char *tag;
|
|
};
|
|
|
|
static struct {
|
|
int stat;
|
|
int errno;
|
|
} nfs_cb_errtbl[] = {
|
|
{ NFS4_OK, 0 },
|
|
{ NFS4ERR_PERM, EPERM },
|
|
{ NFS4ERR_NOENT, ENOENT },
|
|
{ NFS4ERR_IO, EIO },
|
|
{ NFS4ERR_NXIO, ENXIO },
|
|
{ NFS4ERR_ACCESS, EACCES },
|
|
{ NFS4ERR_EXIST, EEXIST },
|
|
{ NFS4ERR_XDEV, EXDEV },
|
|
{ NFS4ERR_NOTDIR, ENOTDIR },
|
|
{ NFS4ERR_ISDIR, EISDIR },
|
|
{ NFS4ERR_INVAL, EINVAL },
|
|
{ NFS4ERR_FBIG, EFBIG },
|
|
{ NFS4ERR_NOSPC, ENOSPC },
|
|
{ NFS4ERR_ROFS, EROFS },
|
|
{ NFS4ERR_MLINK, EMLINK },
|
|
{ NFS4ERR_NAMETOOLONG, ENAMETOOLONG },
|
|
{ NFS4ERR_NOTEMPTY, ENOTEMPTY },
|
|
{ NFS4ERR_DQUOT, EDQUOT },
|
|
{ NFS4ERR_STALE, ESTALE },
|
|
{ NFS4ERR_BADHANDLE, EBADHANDLE },
|
|
{ NFS4ERR_BAD_COOKIE, EBADCOOKIE },
|
|
{ NFS4ERR_NOTSUPP, ENOTSUPP },
|
|
{ NFS4ERR_TOOSMALL, ETOOSMALL },
|
|
{ NFS4ERR_SERVERFAULT, ESERVERFAULT },
|
|
{ NFS4ERR_BADTYPE, EBADTYPE },
|
|
{ NFS4ERR_LOCKED, EAGAIN },
|
|
{ NFS4ERR_RESOURCE, EREMOTEIO },
|
|
{ NFS4ERR_SYMLINK, ELOOP },
|
|
{ NFS4ERR_OP_ILLEGAL, EOPNOTSUPP },
|
|
{ NFS4ERR_DEADLOCK, EDEADLK },
|
|
{ -1, EIO }
|
|
};
|
|
|
|
static int
|
|
nfs_cb_stat_to_errno(int stat)
|
|
{
|
|
int i;
|
|
for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
|
|
if (nfs_cb_errtbl[i].stat == stat)
|
|
return nfs_cb_errtbl[i].errno;
|
|
}
|
|
/* If we cannot translate the error, the recovery routines should
|
|
* handle it.
|
|
* Note: remaining NFSv4 error codes have values > 10000, so should
|
|
* not conflict with native Linux error codes.
|
|
*/
|
|
return stat;
|
|
}
|
|
|
|
/*
|
|
* XDR encode
|
|
*/
|
|
|
|
static void
|
|
encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr)
|
|
{
|
|
__be32 * p;
|
|
|
|
RESERVE_SPACE(16);
|
|
WRITE32(0); /* tag length is always 0 */
|
|
WRITE32(hdr->minorversion);
|
|
WRITE32(hdr->ident);
|
|
hdr->nops_p = p;
|
|
WRITE32(hdr->nops);
|
|
}
|
|
|
|
static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
|
|
{
|
|
*hdr->nops_p = htonl(hdr->nops);
|
|
}
|
|
|
|
static void
|
|
encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp,
|
|
struct nfs4_cb_compound_hdr *hdr)
|
|
{
|
|
__be32 *p;
|
|
int len = dp->dl_fh.fh_size;
|
|
|
|
RESERVE_SPACE(12+sizeof(dp->dl_stateid) + len);
|
|
WRITE32(OP_CB_RECALL);
|
|
WRITE32(dp->dl_stateid.si_generation);
|
|
WRITEMEM(&dp->dl_stateid.si_opaque, sizeof(stateid_opaque_t));
|
|
WRITE32(0); /* truncate optimization not implemented */
|
|
WRITE32(len);
|
|
WRITEMEM(&dp->dl_fh.fh_base, len);
|
|
hdr->nops++;
|
|
}
|
|
|
|
static void
|
|
encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *args,
|
|
struct nfs4_cb_compound_hdr *hdr)
|
|
{
|
|
__be32 *p;
|
|
|
|
if (hdr->minorversion == 0)
|
|
return;
|
|
|
|
RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20);
|
|
|
|
WRITE32(OP_CB_SEQUENCE);
|
|
WRITEMEM(args->cbs_clp->cl_sessionid.data, NFS4_MAX_SESSIONID_LEN);
|
|
WRITE32(args->cbs_clp->cl_cb_seq_nr);
|
|
WRITE32(0); /* slotid, always 0 */
|
|
WRITE32(0); /* highest slotid always 0 */
|
|
WRITE32(0); /* cachethis always 0 */
|
|
WRITE32(0); /* FIXME: support referring_call_lists */
|
|
hdr->nops++;
|
|
}
|
|
|
|
static int
|
|
nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
|
|
{
|
|
struct xdr_stream xdrs, *xdr = &xdrs;
|
|
|
|
xdr_init_encode(&xdrs, &req->rq_snd_buf, p);
|
|
RESERVE_SPACE(0);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p,
|
|
struct nfs4_rpc_args *rpc_args)
|
|
{
|
|
struct xdr_stream xdr;
|
|
struct nfs4_delegation *args = rpc_args->args_op;
|
|
struct nfs4_cb_compound_hdr hdr = {
|
|
.ident = args->dl_ident,
|
|
.minorversion = rpc_args->args_seq.cbs_minorversion,
|
|
};
|
|
|
|
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
|
|
encode_cb_compound_hdr(&xdr, &hdr);
|
|
encode_cb_sequence(&xdr, &rpc_args->args_seq, &hdr);
|
|
encode_cb_recall(&xdr, args, &hdr);
|
|
encode_cb_nops(&hdr);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){
|
|
__be32 *p;
|
|
|
|
READ_BUF(8);
|
|
READ32(hdr->status);
|
|
READ32(hdr->taglen);
|
|
READ_BUF(hdr->taglen + 4);
|
|
hdr->tag = (char *)p;
|
|
p += XDR_QUADLEN(hdr->taglen);
|
|
READ32(hdr->nops);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
|
|
{
|
|
__be32 *p;
|
|
u32 op;
|
|
int32_t nfserr;
|
|
|
|
READ_BUF(8);
|
|
READ32(op);
|
|
if (op != expected) {
|
|
dprintk("NFSD: decode_cb_op_hdr: Callback server returned "
|
|
" operation %d but we issued a request for %d\n",
|
|
op, expected);
|
|
return -EIO;
|
|
}
|
|
READ32(nfserr);
|
|
if (nfserr != NFS_OK)
|
|
return -nfs_cb_stat_to_errno(nfserr);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Our current back channel implmentation supports a single backchannel
|
|
* with a single slot.
|
|
*/
|
|
static int
|
|
decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *res,
|
|
struct rpc_rqst *rqstp)
|
|
{
|
|
struct nfs4_sessionid id;
|
|
int status;
|
|
u32 dummy;
|
|
__be32 *p;
|
|
|
|
if (res->cbs_minorversion == 0)
|
|
return 0;
|
|
|
|
status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE);
|
|
if (status)
|
|
return status;
|
|
|
|
/*
|
|
* If the server returns different values for sessionID, slotID or
|
|
* sequence number, the server is looney tunes.
|
|
*/
|
|
status = -ESERVERFAULT;
|
|
|
|
READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
|
|
memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN);
|
|
p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
|
|
if (memcmp(id.data, res->cbs_clp->cl_sessionid.data,
|
|
NFS4_MAX_SESSIONID_LEN)) {
|
|
dprintk("%s Invalid session id\n", __func__);
|
|
goto out;
|
|
}
|
|
READ32(dummy);
|
|
if (dummy != res->cbs_clp->cl_cb_seq_nr) {
|
|
dprintk("%s Invalid sequence number\n", __func__);
|
|
goto out;
|
|
}
|
|
READ32(dummy); /* slotid must be 0 */
|
|
if (dummy != 0) {
|
|
dprintk("%s Invalid slotid\n", __func__);
|
|
goto out;
|
|
}
|
|
/* FIXME: process highest slotid and target highest slotid */
|
|
status = 0;
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
|
|
static int
|
|
nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p,
|
|
struct nfsd4_cb_sequence *seq)
|
|
{
|
|
struct xdr_stream xdr;
|
|
struct nfs4_cb_compound_hdr hdr;
|
|
int status;
|
|
|
|
xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
|
|
status = decode_cb_compound_hdr(&xdr, &hdr);
|
|
if (status)
|
|
goto out;
|
|
if (seq) {
|
|
status = decode_cb_sequence(&xdr, seq, rqstp);
|
|
if (status)
|
|
goto out;
|
|
}
|
|
status = decode_cb_op_hdr(&xdr, OP_CB_RECALL);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* RPC procedure tables
|
|
*/
|
|
#define PROC(proc, call, argtype, restype) \
|
|
[NFSPROC4_CLNT_##proc] = { \
|
|
.p_proc = NFSPROC4_CB_##call, \
|
|
.p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \
|
|
.p_decode = (kxdrproc_t) nfs4_xdr_##restype, \
|
|
.p_arglen = NFS4_##argtype##_sz, \
|
|
.p_replen = NFS4_##restype##_sz, \
|
|
.p_statidx = NFSPROC4_CB_##call, \
|
|
.p_name = #proc, \
|
|
}
|
|
|
|
static struct rpc_procinfo nfs4_cb_procedures[] = {
|
|
PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null),
|
|
PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall),
|
|
};
|
|
|
|
static struct rpc_version nfs_cb_version4 = {
|
|
.number = 1,
|
|
.nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
|
|
.procs = nfs4_cb_procedures
|
|
};
|
|
|
|
static struct rpc_version * nfs_cb_version[] = {
|
|
NULL,
|
|
&nfs_cb_version4,
|
|
};
|
|
|
|
static struct rpc_program cb_program;
|
|
|
|
static struct rpc_stat cb_stats = {
|
|
.program = &cb_program
|
|
};
|
|
|
|
#define NFS4_CALLBACK 0x40000000
|
|
static struct rpc_program cb_program = {
|
|
.name = "nfs4_cb",
|
|
.number = NFS4_CALLBACK,
|
|
.nrvers = ARRAY_SIZE(nfs_cb_version),
|
|
.version = nfs_cb_version,
|
|
.stats = &cb_stats,
|
|
.pipe_dir_name = "/nfsd4_cb",
|
|
};
|
|
|
|
static int max_cb_time(void)
|
|
{
|
|
return max(NFSD_LEASE_TIME/10, (time_t)1) * HZ;
|
|
}
|
|
|
|
/* Reference counting, callback cleanup, etc., all look racy as heck.
|
|
* And why is cb_set an atomic? */
|
|
|
|
int setup_callback_client(struct nfs4_client *clp)
|
|
{
|
|
struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
|
|
struct rpc_timeout timeparms = {
|
|
.to_initval = max_cb_time(),
|
|
.to_retries = 0,
|
|
};
|
|
struct rpc_create_args args = {
|
|
.protocol = XPRT_TRANSPORT_TCP,
|
|
.address = (struct sockaddr *) &cb->cb_addr,
|
|
.addrsize = cb->cb_addrlen,
|
|
.timeout = &timeparms,
|
|
.program = &cb_program,
|
|
.prognumber = cb->cb_prog,
|
|
.version = nfs_cb_version[1]->number,
|
|
.authflavor = clp->cl_flavor,
|
|
.flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
|
|
.client_name = clp->cl_principal,
|
|
};
|
|
struct rpc_clnt *client;
|
|
|
|
if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5))
|
|
return -EINVAL;
|
|
if (cb->cb_minorversion) {
|
|
args.bc_xprt = clp->cl_cb_xprt;
|
|
args.protocol = XPRT_TRANSPORT_BC_TCP;
|
|
}
|
|
/* Create RPC client */
|
|
client = rpc_create(&args);
|
|
if (IS_ERR(client)) {
|
|
dprintk("NFSD: couldn't create callback client: %ld\n",
|
|
PTR_ERR(client));
|
|
return PTR_ERR(client);
|
|
}
|
|
cb->cb_client = client;
|
|
return 0;
|
|
|
|
}
|
|
|
|
static void warn_no_callback_path(struct nfs4_client *clp, int reason)
|
|
{
|
|
dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
|
|
(int)clp->cl_name.len, clp->cl_name.data, reason);
|
|
}
|
|
|
|
static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs4_client *clp = calldata;
|
|
|
|
if (task->tk_status)
|
|
warn_no_callback_path(clp, task->tk_status);
|
|
else
|
|
atomic_set(&clp->cl_cb_conn.cb_set, 1);
|
|
put_nfs4_client(clp);
|
|
}
|
|
|
|
static const struct rpc_call_ops nfsd4_cb_probe_ops = {
|
|
.rpc_call_done = nfsd4_cb_probe_done,
|
|
};
|
|
|
|
static struct rpc_cred *callback_cred;
|
|
|
|
int set_callback_cred(void)
|
|
{
|
|
callback_cred = rpc_lookup_machine_cred();
|
|
if (!callback_cred)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
|
|
void do_probe_callback(struct nfs4_client *clp)
|
|
{
|
|
struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
|
|
.rpc_argp = clp,
|
|
.rpc_cred = callback_cred
|
|
};
|
|
int status;
|
|
|
|
status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_SOFT,
|
|
&nfsd4_cb_probe_ops, (void *)clp);
|
|
if (status) {
|
|
warn_no_callback_path(clp, status);
|
|
put_nfs4_client(clp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
|
|
*/
|
|
void
|
|
nfsd4_probe_callback(struct nfs4_client *clp)
|
|
{
|
|
int status;
|
|
|
|
BUG_ON(atomic_read(&clp->cl_cb_conn.cb_set));
|
|
|
|
status = setup_callback_client(clp);
|
|
if (status) {
|
|
warn_no_callback_path(clp, status);
|
|
return;
|
|
}
|
|
|
|
/* the task holds a reference to the nfs4_client struct */
|
|
atomic_inc(&clp->cl_count);
|
|
|
|
do_probe_callback(clp);
|
|
}
|
|
|
|
/*
|
|
* There's currently a single callback channel slot.
|
|
* If the slot is available, then mark it busy. Otherwise, set the
|
|
* thread for sleeping on the callback RPC wait queue.
|
|
*/
|
|
static int nfsd41_cb_setup_sequence(struct nfs4_client *clp,
|
|
struct rpc_task *task)
|
|
{
|
|
struct nfs4_rpc_args *args = task->tk_msg.rpc_argp;
|
|
u32 *ptr = (u32 *)clp->cl_sessionid.data;
|
|
int status = 0;
|
|
|
|
dprintk("%s: %u:%u:%u:%u\n", __func__,
|
|
ptr[0], ptr[1], ptr[2], ptr[3]);
|
|
|
|
if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
|
|
rpc_sleep_on(&clp->cl_cb_waitq, task, NULL);
|
|
dprintk("%s slot is busy\n", __func__);
|
|
status = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We'll need the clp during XDR encoding and decoding,
|
|
* and the sequence during decoding to verify the reply
|
|
*/
|
|
args->args_seq.cbs_clp = clp;
|
|
task->tk_msg.rpc_resp = &args->args_seq;
|
|
|
|
out:
|
|
dprintk("%s status=%d\n", __func__, status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* TODO: cb_sequence should support referring call lists, cachethis, multiple
|
|
* slots, and mark callback channel down on communication errors.
|
|
*/
|
|
static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs4_delegation *dp = calldata;
|
|
struct nfs4_client *clp = dp->dl_client;
|
|
struct nfs4_rpc_args *args = task->tk_msg.rpc_argp;
|
|
u32 minorversion = clp->cl_cb_conn.cb_minorversion;
|
|
int status = 0;
|
|
|
|
args->args_seq.cbs_minorversion = minorversion;
|
|
if (minorversion) {
|
|
status = nfsd41_cb_setup_sequence(clp, task);
|
|
if (status) {
|
|
if (status != -EAGAIN) {
|
|
/* terminate rpc task */
|
|
task->tk_status = status;
|
|
task->tk_action = NULL;
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
rpc_call_start(task);
|
|
}
|
|
|
|
static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs4_delegation *dp = calldata;
|
|
struct nfs4_client *clp = dp->dl_client;
|
|
|
|
dprintk("%s: minorversion=%d\n", __func__,
|
|
clp->cl_cb_conn.cb_minorversion);
|
|
|
|
if (clp->cl_cb_conn.cb_minorversion) {
|
|
/* No need for lock, access serialized in nfsd4_cb_prepare */
|
|
++clp->cl_cb_seq_nr;
|
|
clear_bit(0, &clp->cl_cb_slot_busy);
|
|
rpc_wake_up_next(&clp->cl_cb_waitq);
|
|
dprintk("%s: freed slot, new seqid=%d\n", __func__,
|
|
clp->cl_cb_seq_nr);
|
|
|
|
/* We're done looking into the sequence information */
|
|
task->tk_msg.rpc_resp = NULL;
|
|
}
|
|
}
|
|
|
|
static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs4_delegation *dp = calldata;
|
|
struct nfs4_client *clp = dp->dl_client;
|
|
|
|
nfsd4_cb_done(task, calldata);
|
|
|
|
switch (task->tk_status) {
|
|
case -EIO:
|
|
/* Network partition? */
|
|
atomic_set(&clp->cl_cb_conn.cb_set, 0);
|
|
warn_no_callback_path(clp, task->tk_status);
|
|
case -EBADHANDLE:
|
|
case -NFS4ERR_BAD_STATEID:
|
|
/* Race: client probably got cb_recall
|
|
* before open reply granting delegation */
|
|
break;
|
|
default:
|
|
/* success, or error we can't handle */
|
|
goto done;
|
|
}
|
|
if (dp->dl_retries--) {
|
|
rpc_delay(task, 2*HZ);
|
|
task->tk_status = 0;
|
|
rpc_restart_call(task);
|
|
return;
|
|
} else {
|
|
atomic_set(&clp->cl_cb_conn.cb_set, 0);
|
|
warn_no_callback_path(clp, task->tk_status);
|
|
}
|
|
done:
|
|
kfree(task->tk_msg.rpc_argp);
|
|
}
|
|
|
|
static void nfsd4_cb_recall_release(void *calldata)
|
|
{
|
|
struct nfs4_delegation *dp = calldata;
|
|
struct nfs4_client *clp = dp->dl_client;
|
|
|
|
nfs4_put_delegation(dp);
|
|
put_nfs4_client(clp);
|
|
}
|
|
|
|
static const struct rpc_call_ops nfsd4_cb_recall_ops = {
|
|
.rpc_call_prepare = nfsd4_cb_prepare,
|
|
.rpc_call_done = nfsd4_cb_recall_done,
|
|
.rpc_release = nfsd4_cb_recall_release,
|
|
};
|
|
|
|
/*
|
|
* called with dp->dl_count inc'ed.
|
|
*/
|
|
void
|
|
nfsd4_cb_recall(struct nfs4_delegation *dp)
|
|
{
|
|
struct nfs4_client *clp = dp->dl_client;
|
|
struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
|
|
struct nfs4_rpc_args *args;
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
|
|
.rpc_cred = callback_cred
|
|
};
|
|
int status = -ENOMEM;
|
|
|
|
args = kzalloc(sizeof(*args), GFP_KERNEL);
|
|
if (!args)
|
|
goto out;
|
|
args->args_op = dp;
|
|
msg.rpc_argp = args;
|
|
dp->dl_retries = 1;
|
|
status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT,
|
|
&nfsd4_cb_recall_ops, dp);
|
|
out:
|
|
if (status) {
|
|
kfree(args);
|
|
put_nfs4_client(clp);
|
|
nfs4_put_delegation(dp);
|
|
}
|
|
}
|