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nfsd41: sunrpc: Added rpc server-side backchannel handling

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When the call direction is a reply, copy the xid and call direction into the
req->rq_private_buf.head[0].iov_base otherwise rpc_verify_header returns
rpc_garbage.

Signed-off-by: Rahul Iyer <iyer@netapp.com>
Signed-off-by: Mike Sager <sager@netapp.com>
Signed-off-by: Marc Eshel <eshel@almaden.ibm.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[get rid of CONFIG_NFSD_V4_1]
[sunrpc: refactoring of svc_tcp_recvfrom]
[nfsd41: sunrpc: create common send routine for the fore and the back channels]
[nfsd41: sunrpc: Use free_page() to free server backchannel pages]
[nfsd41: sunrpc: Document server backchannel locking]
[nfsd41: sunrpc: remove bc_connect_worker()]
[nfsd41: sunrpc: Define xprt_server_backchannel()[
[nfsd41: sunrpc: remove bc_close and bc_init_auto_disconnect dummy functions]
[nfsd41: sunrpc: eliminate unneeded switch statement in xs_setup_tcp()]
[nfsd41: sunrpc: Don't auto close the server backchannel connection]
[nfsd41: sunrpc: Remove unused functions]
Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfsd41: change bc_sock to bc_xprt]
[nfsd41: sunrpc: move struct rpc_buffer def into a common header file]
[nfsd41: sunrpc: use rpc_sleep in bc_send_request so not to block on mutex]
[removed cosmetic changes]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[sunrpc: add new xprt class for nfsv4.1 backchannel]
[sunrpc: v2.1 change handling of auto_close and init_auto_disconnect operations for the nfsv4.1 backchannel]
Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
[reverted more cosmetic leftovers]
[got rid of xprt_server_backchannel]
[separated "nfsd41: sunrpc: add new xprt class for nfsv4.1 backchannel"]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Cc: Trond Myklebust <trond.myklebust@netapp.com>
[sunrpc: change idle timeout value for the backchannel]
Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Acked-by: Trond Myklebust <trond.myklebust@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Rahul Iyer
2009-09-10 17:32:28 +03:00
committed by J. Bruce Fields
parent 6951867b99
commit 4cfc7e6019
8 changed files with 303 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files

172
net/sunrpc/svcsock.c
View File

@@ -49,6 +49,7 @@
#include <linux/sunrpc/msg_prot.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/xprt.h>
#define RPCDBG_FACILITY RPCDBG_SVCXPRT
@@ -153,49 +154,27 @@ static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
}
/*
* Generic sendto routine
* send routine intended to be shared by the fore- and back-channel
*/
static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
struct page *headpage, unsigned long headoffset,
struct page *tailpage, unsigned long tailoffset)
{
struct svc_sock *svsk =
container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
struct socket *sock = svsk->sk_sock;
int slen;
union {
struct cmsghdr hdr;
long all[SVC_PKTINFO_SPACE / sizeof(long)];
} buffer;
struct cmsghdr *cmh = &buffer.hdr;
int len = 0;
int result;
int size;
struct page **ppage = xdr->pages;
size_t base = xdr->page_base;
unsigned int pglen = xdr->page_len;
unsigned int flags = MSG_MORE;
RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
int slen;
int len = 0;
slen = xdr->len;
if (rqstp->rq_prot == IPPROTO_UDP) {
struct msghdr msg = {
.msg_name = &rqstp->rq_addr,
.msg_namelen = rqstp->rq_addrlen,
.msg_control = cmh,
.msg_controllen = sizeof(buffer),
.msg_flags = MSG_MORE,
};
svc_set_cmsg_data(rqstp, cmh);
if (sock_sendmsg(sock, &msg, 0) < 0)
goto out;
}
/* send head */
if (slen == xdr->head[0].iov_len)
flags = 0;
len = kernel_sendpage(sock, rqstp->rq_respages[0], 0,
len = kernel_sendpage(sock, headpage, headoffset,
xdr->head[0].iov_len, flags);
if (len != xdr->head[0].iov_len)
goto out;
@@ -219,16 +198,58 @@ static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
base = 0;
ppage++;
}
/* send tail */
if (xdr->tail[0].iov_len) {
result = kernel_sendpage(sock, rqstp->rq_respages[0],
((unsigned long)xdr->tail[0].iov_base)
& (PAGE_SIZE-1),
xdr->tail[0].iov_len, 0);
result = kernel_sendpage(sock, tailpage, tailoffset,
xdr->tail[0].iov_len, 0);
if (result > 0)
len += result;
}
out:
return len;
}
/*
* Generic sendto routine
*/
static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
{
struct svc_sock *svsk =
container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
struct socket *sock = svsk->sk_sock;
union {
struct cmsghdr hdr;
long all[SVC_PKTINFO_SPACE / sizeof(long)];
} buffer;
struct cmsghdr *cmh = &buffer.hdr;
int len = 0;
unsigned long tailoff;
unsigned long headoff;
RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
if (rqstp->rq_prot == IPPROTO_UDP) {
struct msghdr msg = {
.msg_name = &rqstp->rq_addr,
.msg_namelen = rqstp->rq_addrlen,
.msg_control = cmh,
.msg_controllen = sizeof(buffer),
.msg_flags = MSG_MORE,
};
svc_set_cmsg_data(rqstp, cmh);
if (sock_sendmsg(sock, &msg, 0) < 0)
goto out;
}
tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
headoff = 0;
len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
rqstp->rq_respages[0], tailoff);
out:
dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
@@ -951,6 +972,57 @@ static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
return -EAGAIN;
}
static int svc_process_calldir(struct svc_sock *svsk, struct svc_rqst *rqstp,
struct rpc_rqst **reqpp, struct kvec *vec)
{
struct rpc_rqst *req = NULL;
u32 *p;
u32 xid;
u32 calldir;
int len;
len = svc_recvfrom(rqstp, vec, 1, 8);
if (len < 0)
goto error;
p = (u32 *)rqstp->rq_arg.head[0].iov_base;
xid = *p++;
calldir = *p;
if (calldir == 0) {
/* REQUEST is the most common case */
vec[0] = rqstp->rq_arg.head[0];
} else {
/* REPLY */
if (svsk->sk_bc_xprt)
req = xprt_lookup_rqst(svsk->sk_bc_xprt, xid);
if (!req) {
printk(KERN_NOTICE
"%s: Got unrecognized reply: "
"calldir 0x%x sk_bc_xprt %p xid %08x\n",
__func__, ntohl(calldir),
svsk->sk_bc_xprt, xid);
vec[0] = rqstp->rq_arg.head[0];
goto out;
}
memcpy(&req->rq_private_buf, &req->rq_rcv_buf,
sizeof(struct xdr_buf));
/* copy the xid and call direction */
memcpy(req->rq_private_buf.head[0].iov_base,
rqstp->rq_arg.head[0].iov_base, 8);
vec[0] = req->rq_private_buf.head[0];
}
out:
vec[0].iov_base += 8;
vec[0].iov_len -= 8;
len = svsk->sk_reclen - 8;
error:
*reqpp = req;
return len;
}
/*
* Receive data from a TCP socket.
*/
@@ -962,6 +1034,7 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
int len;
struct kvec *vec;
int pnum, vlen;
struct rpc_rqst *req = NULL;
dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
@@ -975,9 +1048,27 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
vec = rqstp->rq_vec;
vec[0] = rqstp->rq_arg.head[0];
vlen = PAGE_SIZE;
/*
* We have enough data for the whole tcp record. Let's try and read the
* first 8 bytes to get the xid and the call direction. We can use this
* to figure out if this is a call or a reply to a callback. If
* sk_reclen is < 8 (xid and calldir), then this is a malformed packet.
* In that case, don't bother with the calldir and just read the data.
* It will be rejected in svc_process.
*/
if (len >= 8) {
len = svc_process_calldir(svsk, rqstp, &req, vec);
if (len < 0)
goto err_again;
vlen -= 8;
}
pnum = 1;
while (vlen < len) {
vec[pnum].iov_base = page_address(rqstp->rq_pages[pnum]);
vec[pnum].iov_base = (req) ?
page_address(req->rq_private_buf.pages[pnum - 1]) :
page_address(rqstp->rq_pages[pnum]);
vec[pnum].iov_len = PAGE_SIZE;
pnum++;
vlen += PAGE_SIZE;
@@ -989,6 +1080,16 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
if (len < 0)
goto err_again;
/*
* Account for the 8 bytes we read earlier
*/
len += 8;
if (req) {
xprt_complete_rqst(req->rq_task, len);
len = 0;
goto out;
}
dprintk("svc: TCP complete record (%d bytes)\n", len);
rqstp->rq_arg.len = len;
rqstp->rq_arg.page_base = 0;
@@ -1002,6 +1103,7 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
rqstp->rq_xprt_ctxt = NULL;
rqstp->rq_prot = IPPROTO_TCP;
out:
/* Reset TCP read info */
svsk->sk_reclen = 0;
svsk->sk_tcplen = 0;