Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
new file mode 100644
index 0000000..0590703
--- /dev/null
+++ b/net/sunrpc/svcsock.c
@@ -0,0 +1,1585 @@
+/*
+ * linux/net/sunrpc/svcsock.c
+ *
+ * These are the RPC server socket internals.
+ *
+ * The server scheduling algorithm does not always distribute the load
+ * evenly when servicing a single client. May need to modify the
+ * svc_sock_enqueue procedure...
+ *
+ * TCP support is largely untested and may be a little slow. The problem
+ * is that we currently do two separate recvfrom's, one for the 4-byte
+ * record length, and the second for the actual record. This could possibly
+ * be improved by always reading a minimum size of around 100 bytes and
+ * tucking any superfluous bytes away in a temporary store. Still, that
+ * leaves write requests out in the rain. An alternative may be to peek at
+ * the first skb in the queue, and if it matches the next TCP sequence
+ * number, to extract the record marker. Yuck.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/udp.h>
+#include <linux/tcp.h>
+#include <linux/unistd.h>
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/checksum.h>
+#include <net/ip.h>
+#include <net/tcp.h>
+#include <asm/uaccess.h>
+#include <asm/ioctls.h>
+
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/stats.h>
+
+/* SMP locking strategy:
+ *
+ * svc_serv->sv_lock protects most stuff for that service.
+ *
+ * Some flags can be set to certain values at any time
+ * providing that certain rules are followed:
+ *
+ * SK_BUSY can be set to 0 at any time.
+ * svc_sock_enqueue must be called afterwards
+ * SK_CONN, SK_DATA, can be set or cleared at any time.
+ * after a set, svc_sock_enqueue must be called.
+ * after a clear, the socket must be read/accepted
+ * if this succeeds, it must be set again.
+ * SK_CLOSE can set at any time. It is never cleared.
+ *
+ */
+
+#define RPCDBG_FACILITY RPCDBG_SVCSOCK
+
+
+static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
+ int *errp, int pmap_reg);
+static void svc_udp_data_ready(struct sock *, int);
+static int svc_udp_recvfrom(struct svc_rqst *);
+static int svc_udp_sendto(struct svc_rqst *);
+
+static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk);
+static int svc_deferred_recv(struct svc_rqst *rqstp);
+static struct cache_deferred_req *svc_defer(struct cache_req *req);
+
+/*
+ * Queue up an idle server thread. Must have serv->sv_lock held.
+ * Note: this is really a stack rather than a queue, so that we only
+ * use as many different threads as we need, and the rest don't polute
+ * the cache.
+ */
+static inline void
+svc_serv_enqueue(struct svc_serv *serv, struct svc_rqst *rqstp)
+{
+ list_add(&rqstp->rq_list, &serv->sv_threads);
+}
+
+/*
+ * Dequeue an nfsd thread. Must have serv->sv_lock held.
+ */
+static inline void
+svc_serv_dequeue(struct svc_serv *serv, struct svc_rqst *rqstp)
+{
+ list_del(&rqstp->rq_list);
+}
+
+/*
+ * Release an skbuff after use
+ */
+static inline void
+svc_release_skb(struct svc_rqst *rqstp)
+{
+ struct sk_buff *skb = rqstp->rq_skbuff;
+ struct svc_deferred_req *dr = rqstp->rq_deferred;
+
+ if (skb) {
+ rqstp->rq_skbuff = NULL;
+
+ dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
+ skb_free_datagram(rqstp->rq_sock->sk_sk, skb);
+ }
+ if (dr) {
+ rqstp->rq_deferred = NULL;
+ kfree(dr);
+ }
+}
+
+/*
+ * Any space to write?
+ */
+static inline unsigned long
+svc_sock_wspace(struct svc_sock *svsk)
+{
+ int wspace;
+
+ if (svsk->sk_sock->type == SOCK_STREAM)
+ wspace = sk_stream_wspace(svsk->sk_sk);
+ else
+ wspace = sock_wspace(svsk->sk_sk);
+
+ return wspace;
+}
+
+/*
+ * Queue up a socket with data pending. If there are idle nfsd
+ * processes, wake 'em up.
+ *
+ */
+static void
+svc_sock_enqueue(struct svc_sock *svsk)
+{
+ struct svc_serv *serv = svsk->sk_server;
+ struct svc_rqst *rqstp;
+
+ if (!(svsk->sk_flags &
+ ( (1<<SK_CONN)|(1<<SK_DATA)|(1<<SK_CLOSE)|(1<<SK_DEFERRED)) ))
+ return;
+ if (test_bit(SK_DEAD, &svsk->sk_flags))
+ return;
+
+ spin_lock_bh(&serv->sv_lock);
+
+ if (!list_empty(&serv->sv_threads) &&
+ !list_empty(&serv->sv_sockets))
+ printk(KERN_ERR
+ "svc_sock_enqueue: threads and sockets both waiting??\n");
+
+ if (test_bit(SK_DEAD, &svsk->sk_flags)) {
+ /* Don't enqueue dead sockets */
+ dprintk("svc: socket %p is dead, not enqueued\n", svsk->sk_sk);
+ goto out_unlock;
+ }
+
+ if (test_bit(SK_BUSY, &svsk->sk_flags)) {
+ /* Don't enqueue socket while daemon is receiving */
+ dprintk("svc: socket %p busy, not enqueued\n", svsk->sk_sk);
+ goto out_unlock;
+ }
+
+ set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
+ if (((svsk->sk_reserved + serv->sv_bufsz)*2
+ > svc_sock_wspace(svsk))
+ && !test_bit(SK_CLOSE, &svsk->sk_flags)
+ && !test_bit(SK_CONN, &svsk->sk_flags)) {
+ /* Don't enqueue while not enough space for reply */
+ dprintk("svc: socket %p no space, %d*2 > %ld, not enqueued\n",
+ svsk->sk_sk, svsk->sk_reserved+serv->sv_bufsz,
+ svc_sock_wspace(svsk));
+ goto out_unlock;
+ }
+ clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
+
+ /* Mark socket as busy. It will remain in this state until the
+ * server has processed all pending data and put the socket back
+ * on the idle list.
+ */
+ set_bit(SK_BUSY, &svsk->sk_flags);
+
+ if (!list_empty(&serv->sv_threads)) {
+ rqstp = list_entry(serv->sv_threads.next,
+ struct svc_rqst,
+ rq_list);
+ dprintk("svc: socket %p served by daemon %p\n",
+ svsk->sk_sk, rqstp);
+ svc_serv_dequeue(serv, rqstp);
+ if (rqstp->rq_sock)
+ printk(KERN_ERR
+ "svc_sock_enqueue: server %p, rq_sock=%p!\n",
+ rqstp, rqstp->rq_sock);
+ rqstp->rq_sock = svsk;
+ svsk->sk_inuse++;
+ rqstp->rq_reserved = serv->sv_bufsz;
+ svsk->sk_reserved += rqstp->rq_reserved;
+ wake_up(&rqstp->rq_wait);
+ } else {
+ dprintk("svc: socket %p put into queue\n", svsk->sk_sk);
+ list_add_tail(&svsk->sk_ready, &serv->sv_sockets);
+ }
+
+out_unlock:
+ spin_unlock_bh(&serv->sv_lock);
+}
+
+/*
+ * Dequeue the first socket. Must be called with the serv->sv_lock held.
+ */
+static inline struct svc_sock *
+svc_sock_dequeue(struct svc_serv *serv)
+{
+ struct svc_sock *svsk;
+
+ if (list_empty(&serv->sv_sockets))
+ return NULL;
+
+ svsk = list_entry(serv->sv_sockets.next,
+ struct svc_sock, sk_ready);
+ list_del_init(&svsk->sk_ready);
+
+ dprintk("svc: socket %p dequeued, inuse=%d\n",
+ svsk->sk_sk, svsk->sk_inuse);
+
+ return svsk;
+}
+
+/*
+ * Having read something from a socket, check whether it
+ * needs to be re-enqueued.
+ * Note: SK_DATA only gets cleared when a read-attempt finds
+ * no (or insufficient) data.
+ */
+static inline void
+svc_sock_received(struct svc_sock *svsk)
+{
+ clear_bit(SK_BUSY, &svsk->sk_flags);
+ svc_sock_enqueue(svsk);
+}
+
+
+/**
+ * svc_reserve - change the space reserved for the reply to a request.
+ * @rqstp: The request in question
+ * @space: new max space to reserve
+ *
+ * Each request reserves some space on the output queue of the socket
+ * to make sure the reply fits. This function reduces that reserved
+ * space to be the amount of space used already, plus @space.
+ *
+ */
+void svc_reserve(struct svc_rqst *rqstp, int space)
+{
+ space += rqstp->rq_res.head[0].iov_len;
+
+ if (space < rqstp->rq_reserved) {
+ struct svc_sock *svsk = rqstp->rq_sock;
+ spin_lock_bh(&svsk->sk_server->sv_lock);
+ svsk->sk_reserved -= (rqstp->rq_reserved - space);
+ rqstp->rq_reserved = space;
+ spin_unlock_bh(&svsk->sk_server->sv_lock);
+
+ svc_sock_enqueue(svsk);
+ }
+}
+
+/*
+ * Release a socket after use.
+ */
+static inline void
+svc_sock_put(struct svc_sock *svsk)
+{
+ struct svc_serv *serv = svsk->sk_server;
+
+ spin_lock_bh(&serv->sv_lock);
+ if (!--(svsk->sk_inuse) && test_bit(SK_DEAD, &svsk->sk_flags)) {
+ spin_unlock_bh(&serv->sv_lock);
+ dprintk("svc: releasing dead socket\n");
+ sock_release(svsk->sk_sock);
+ kfree(svsk);
+ }
+ else
+ spin_unlock_bh(&serv->sv_lock);
+}
+
+static void
+svc_sock_release(struct svc_rqst *rqstp)
+{
+ struct svc_sock *svsk = rqstp->rq_sock;
+
+ svc_release_skb(rqstp);
+
+ svc_free_allpages(rqstp);
+ rqstp->rq_res.page_len = 0;
+ rqstp->rq_res.page_base = 0;
+
+
+ /* Reset response buffer and release
+ * the reservation.
+ * But first, check that enough space was reserved
+ * for the reply, otherwise we have a bug!
+ */
+ if ((rqstp->rq_res.len) > rqstp->rq_reserved)
+ printk(KERN_ERR "RPC request reserved %d but used %d\n",
+ rqstp->rq_reserved,
+ rqstp->rq_res.len);
+
+ rqstp->rq_res.head[0].iov_len = 0;
+ svc_reserve(rqstp, 0);
+ rqstp->rq_sock = NULL;
+
+ svc_sock_put(svsk);
+}
+
+/*
+ * External function to wake up a server waiting for data
+ */
+void
+svc_wake_up(struct svc_serv *serv)
+{
+ struct svc_rqst *rqstp;
+
+ spin_lock_bh(&serv->sv_lock);
+ if (!list_empty(&serv->sv_threads)) {
+ rqstp = list_entry(serv->sv_threads.next,
+ struct svc_rqst,
+ rq_list);
+ dprintk("svc: daemon %p woken up.\n", rqstp);
+ /*
+ svc_serv_dequeue(serv, rqstp);
+ rqstp->rq_sock = NULL;
+ */
+ wake_up(&rqstp->rq_wait);
+ }
+ spin_unlock_bh(&serv->sv_lock);
+}
+
+/*
+ * Generic sendto routine
+ */
+static int
+svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
+{
+ struct svc_sock *svsk = rqstp->rq_sock;
+ struct socket *sock = svsk->sk_sock;
+ int slen;
+ char buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];
+ struct cmsghdr *cmh = (struct cmsghdr *)buffer;
+ struct in_pktinfo *pki = (struct in_pktinfo *)CMSG_DATA(cmh);
+ 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;
+
+ slen = xdr->len;
+
+ if (rqstp->rq_prot == IPPROTO_UDP) {
+ /* set the source and destination */
+ struct msghdr msg;
+ msg.msg_name = &rqstp->rq_addr;
+ msg.msg_namelen = sizeof(rqstp->rq_addr);
+ msg.msg_iov = NULL;
+ msg.msg_iovlen = 0;
+ msg.msg_flags = MSG_MORE;
+
+ msg.msg_control = cmh;
+ msg.msg_controllen = sizeof(buffer);
+ cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
+ cmh->cmsg_level = SOL_IP;
+ cmh->cmsg_type = IP_PKTINFO;
+ pki->ipi_ifindex = 0;
+ pki->ipi_spec_dst.s_addr = rqstp->rq_daddr;
+
+ if (sock_sendmsg(sock, &msg, 0) < 0)
+ goto out;
+ }
+
+ /* send head */
+ if (slen == xdr->head[0].iov_len)
+ flags = 0;
+ len = sock->ops->sendpage(sock, rqstp->rq_respages[0], 0, xdr->head[0].iov_len, flags);
+ if (len != xdr->head[0].iov_len)
+ goto out;
+ slen -= xdr->head[0].iov_len;
+ if (slen == 0)
+ goto out;
+
+ /* send page data */
+ size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
+ while (pglen > 0) {
+ if (slen == size)
+ flags = 0;
+ result = sock->ops->sendpage(sock, *ppage, base, size, flags);
+ if (result > 0)
+ len += result;
+ if (result != size)
+ goto out;
+ slen -= size;
+ pglen -= size;
+ size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
+ base = 0;
+ ppage++;
+ }
+ /* send tail */
+ if (xdr->tail[0].iov_len) {
+ result = sock->ops->sendpage(sock, rqstp->rq_respages[rqstp->rq_restailpage],
+ ((unsigned long)xdr->tail[0].iov_base)& (PAGE_SIZE-1),
+ xdr->tail[0].iov_len, 0);
+
+ if (result > 0)
+ len += result;
+ }
+out:
+ dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %x)\n",
+ rqstp->rq_sock, xdr->head[0].iov_base, xdr->head[0].iov_len, xdr->len, len,
+ rqstp->rq_addr.sin_addr.s_addr);
+
+ return len;
+}
+
+/*
+ * Check input queue length
+ */
+static int
+svc_recv_available(struct svc_sock *svsk)
+{
+ mm_segment_t oldfs;
+ struct socket *sock = svsk->sk_sock;
+ int avail, err;
+
+ oldfs = get_fs(); set_fs(KERNEL_DS);
+ err = sock->ops->ioctl(sock, TIOCINQ, (unsigned long) &avail);
+ set_fs(oldfs);
+
+ return (err >= 0)? avail : err;
+}
+
+/*
+ * Generic recvfrom routine.
+ */
+static int
+svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, int buflen)
+{
+ struct msghdr msg;
+ struct socket *sock;
+ int len, alen;
+
+ rqstp->rq_addrlen = sizeof(rqstp->rq_addr);
+ sock = rqstp->rq_sock->sk_sock;
+
+ msg.msg_name = &rqstp->rq_addr;
+ msg.msg_namelen = sizeof(rqstp->rq_addr);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+
+ msg.msg_flags = MSG_DONTWAIT;
+
+ len = kernel_recvmsg(sock, &msg, iov, nr, buflen, MSG_DONTWAIT);
+
+ /* sock_recvmsg doesn't fill in the name/namelen, so we must..
+ * possibly we should cache this in the svc_sock structure
+ * at accept time. FIXME
+ */
+ alen = sizeof(rqstp->rq_addr);
+ sock->ops->getname(sock, (struct sockaddr *)&rqstp->rq_addr, &alen, 1);
+
+ dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
+ rqstp->rq_sock, iov[0].iov_base, iov[0].iov_len, len);
+
+ return len;
+}
+
+/*
+ * Set socket snd and rcv buffer lengths
+ */
+static inline void
+svc_sock_setbufsize(struct socket *sock, unsigned int snd, unsigned int rcv)
+{
+#if 0
+ mm_segment_t oldfs;
+ oldfs = get_fs(); set_fs(KERNEL_DS);
+ sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
+ (char*)&snd, sizeof(snd));
+ sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
+ (char*)&rcv, sizeof(rcv));
+#else
+ /* sock_setsockopt limits use to sysctl_?mem_max,
+ * which isn't acceptable. Until that is made conditional
+ * on not having CAP_SYS_RESOURCE or similar, we go direct...
+ * DaveM said I could!
+ */
+ lock_sock(sock->sk);
+ sock->sk->sk_sndbuf = snd * 2;
+ sock->sk->sk_rcvbuf = rcv * 2;
+ sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
+ release_sock(sock->sk);
+#endif
+}
+/*
+ * INET callback when data has been received on the socket.
+ */
+static void
+svc_udp_data_ready(struct sock *sk, int count)
+{
+ struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
+
+ if (!svsk)
+ goto out;
+ dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
+ svsk, sk, count, test_bit(SK_BUSY, &svsk->sk_flags));
+ set_bit(SK_DATA, &svsk->sk_flags);
+ svc_sock_enqueue(svsk);
+ out:
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ wake_up_interruptible(sk->sk_sleep);
+}
+
+/*
+ * INET callback when space is newly available on the socket.
+ */
+static void
+svc_write_space(struct sock *sk)
+{
+ struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
+
+ if (svsk) {
+ dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
+ svsk, sk, test_bit(SK_BUSY, &svsk->sk_flags));
+ svc_sock_enqueue(svsk);
+ }
+
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) {
+ printk(KERN_WARNING "RPC svc_write_space: some sleeping on %p\n",
+ svsk);
+ wake_up_interruptible(sk->sk_sleep);
+ }
+}
+
+/*
+ * Receive a datagram from a UDP socket.
+ */
+extern int
+csum_partial_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb);
+
+static int
+svc_udp_recvfrom(struct svc_rqst *rqstp)
+{
+ struct svc_sock *svsk = rqstp->rq_sock;
+ struct svc_serv *serv = svsk->sk_server;
+ struct sk_buff *skb;
+ int err, len;
+
+ if (test_and_clear_bit(SK_CHNGBUF, &svsk->sk_flags))
+ /* udp sockets need large rcvbuf as all pending
+ * requests are still in that buffer. sndbuf must
+ * also be large enough that there is enough space
+ * for one reply per thread.
+ */
+ svc_sock_setbufsize(svsk->sk_sock,
+ (serv->sv_nrthreads+3) * serv->sv_bufsz,
+ (serv->sv_nrthreads+3) * serv->sv_bufsz);
+
+ if ((rqstp->rq_deferred = svc_deferred_dequeue(svsk))) {
+ svc_sock_received(svsk);
+ return svc_deferred_recv(rqstp);
+ }
+
+ clear_bit(SK_DATA, &svsk->sk_flags);
+ while ((skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err)) == NULL) {
+ if (err == -EAGAIN) {
+ svc_sock_received(svsk);
+ return err;
+ }
+ /* possibly an icmp error */
+ dprintk("svc: recvfrom returned error %d\n", -err);
+ }
+ if (skb->stamp.tv_sec == 0) {
+ skb->stamp.tv_sec = xtime.tv_sec;
+ skb->stamp.tv_usec = xtime.tv_nsec * 1000;
+ /* Don't enable netstamp, sunrpc doesn't
+ need that much accuracy */
+ }
+ svsk->sk_sk->sk_stamp = skb->stamp;
+ set_bit(SK_DATA, &svsk->sk_flags); /* there may be more data... */
+
+ /*
+ * Maybe more packets - kick another thread ASAP.
+ */
+ svc_sock_received(svsk);
+
+ len = skb->len - sizeof(struct udphdr);
+ rqstp->rq_arg.len = len;
+
+ rqstp->rq_prot = IPPROTO_UDP;
+
+ /* Get sender address */
+ rqstp->rq_addr.sin_family = AF_INET;
+ rqstp->rq_addr.sin_port = skb->h.uh->source;
+ rqstp->rq_addr.sin_addr.s_addr = skb->nh.iph->saddr;
+ rqstp->rq_daddr = skb->nh.iph->daddr;
+
+ if (skb_is_nonlinear(skb)) {
+ /* we have to copy */
+ local_bh_disable();
+ if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
+ local_bh_enable();
+ /* checksum error */
+ skb_free_datagram(svsk->sk_sk, skb);
+ return 0;
+ }
+ local_bh_enable();
+ skb_free_datagram(svsk->sk_sk, skb);
+ } else {
+ /* we can use it in-place */
+ rqstp->rq_arg.head[0].iov_base = skb->data + sizeof(struct udphdr);
+ rqstp->rq_arg.head[0].iov_len = len;
+ if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
+ if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
+ skb_free_datagram(svsk->sk_sk, skb);
+ return 0;
+ }
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ rqstp->rq_skbuff = skb;
+ }
+
+ rqstp->rq_arg.page_base = 0;
+ if (len <= rqstp->rq_arg.head[0].iov_len) {
+ rqstp->rq_arg.head[0].iov_len = len;
+ rqstp->rq_arg.page_len = 0;
+ } else {
+ rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
+ rqstp->rq_argused += (rqstp->rq_arg.page_len + PAGE_SIZE - 1)/ PAGE_SIZE;
+ }
+
+ if (serv->sv_stats)
+ serv->sv_stats->netudpcnt++;
+
+ return len;
+}
+
+static int
+svc_udp_sendto(struct svc_rqst *rqstp)
+{
+ int error;
+
+ error = svc_sendto(rqstp, &rqstp->rq_res);
+ if (error == -ECONNREFUSED)
+ /* ICMP error on earlier request. */
+ error = svc_sendto(rqstp, &rqstp->rq_res);
+
+ return error;
+}
+
+static void
+svc_udp_init(struct svc_sock *svsk)
+{
+ svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
+ svsk->sk_sk->sk_write_space = svc_write_space;
+ svsk->sk_recvfrom = svc_udp_recvfrom;
+ svsk->sk_sendto = svc_udp_sendto;
+
+ /* initialise setting must have enough space to
+ * receive and respond to one request.
+ * svc_udp_recvfrom will re-adjust if necessary
+ */
+ svc_sock_setbufsize(svsk->sk_sock,
+ 3 * svsk->sk_server->sv_bufsz,
+ 3 * svsk->sk_server->sv_bufsz);
+
+ set_bit(SK_DATA, &svsk->sk_flags); /* might have come in before data_ready set up */
+ set_bit(SK_CHNGBUF, &svsk->sk_flags);
+}
+
+/*
+ * A data_ready event on a listening socket means there's a connection
+ * pending. Do not use state_change as a substitute for it.
+ */
+static void
+svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
+{
+ struct svc_sock *svsk;
+
+ dprintk("svc: socket %p TCP (listen) state change %d\n",
+ sk, sk->sk_state);
+
+ if (sk->sk_state != TCP_LISTEN) {
+ /*
+ * This callback may called twice when a new connection
+ * is established as a child socket inherits everything
+ * from a parent LISTEN socket.
+ * 1) data_ready method of the parent socket will be called
+ * when one of child sockets become ESTABLISHED.
+ * 2) data_ready method of the child socket may be called
+ * when it receives data before the socket is accepted.
+ * In case of 2, we should ignore it silently.
+ */
+ goto out;
+ }
+ if (!(svsk = (struct svc_sock *) sk->sk_user_data)) {
+ printk("svc: socket %p: no user data\n", sk);
+ goto out;
+ }
+ set_bit(SK_CONN, &svsk->sk_flags);
+ svc_sock_enqueue(svsk);
+ out:
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ wake_up_interruptible_all(sk->sk_sleep);
+}
+
+/*
+ * A state change on a connected socket means it's dying or dead.
+ */
+static void
+svc_tcp_state_change(struct sock *sk)
+{
+ struct svc_sock *svsk;
+
+ dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
+ sk, sk->sk_state, sk->sk_user_data);
+
+ if (!(svsk = (struct svc_sock *) sk->sk_user_data)) {
+ printk("svc: socket %p: no user data\n", sk);
+ goto out;
+ }
+ set_bit(SK_CLOSE, &svsk->sk_flags);
+ svc_sock_enqueue(svsk);
+ out:
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ wake_up_interruptible_all(sk->sk_sleep);
+}
+
+static void
+svc_tcp_data_ready(struct sock *sk, int count)
+{
+ struct svc_sock * svsk;
+
+ dprintk("svc: socket %p TCP data ready (svsk %p)\n",
+ sk, sk->sk_user_data);
+ if (!(svsk = (struct svc_sock *)(sk->sk_user_data)))
+ goto out;
+ set_bit(SK_DATA, &svsk->sk_flags);
+ svc_sock_enqueue(svsk);
+ out:
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ wake_up_interruptible(sk->sk_sleep);
+}
+
+/*
+ * Accept a TCP connection
+ */
+static void
+svc_tcp_accept(struct svc_sock *svsk)
+{
+ struct sockaddr_in sin;
+ struct svc_serv *serv = svsk->sk_server;
+ struct socket *sock = svsk->sk_sock;
+ struct socket *newsock;
+ struct proto_ops *ops;
+ struct svc_sock *newsvsk;
+ int err, slen;
+
+ dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
+ if (!sock)
+ return;
+
+ err = sock_create_lite(PF_INET, SOCK_STREAM, IPPROTO_TCP, &newsock);
+ if (err) {
+ if (err == -ENOMEM)
+ printk(KERN_WARNING "%s: no more sockets!\n",
+ serv->sv_name);
+ return;
+ }
+
+ dprintk("svc: tcp_accept %p allocated\n", newsock);
+ newsock->ops = ops = sock->ops;
+
+ clear_bit(SK_CONN, &svsk->sk_flags);
+ if ((err = ops->accept(sock, newsock, O_NONBLOCK)) < 0) {
+ if (err != -EAGAIN && net_ratelimit())
+ printk(KERN_WARNING "%s: accept failed (err %d)!\n",
+ serv->sv_name, -err);
+ goto failed; /* aborted connection or whatever */
+ }
+ set_bit(SK_CONN, &svsk->sk_flags);
+ svc_sock_enqueue(svsk);
+
+ slen = sizeof(sin);
+ err = ops->getname(newsock, (struct sockaddr *) &sin, &slen, 1);
+ if (err < 0) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "%s: peername failed (err %d)!\n",
+ serv->sv_name, -err);
+ goto failed; /* aborted connection or whatever */
+ }
+
+ /* Ideally, we would want to reject connections from unauthorized
+ * hosts here, but when we get encription, the IP of the host won't
+ * tell us anything. For now just warn about unpriv connections.
+ */
+ if (ntohs(sin.sin_port) >= 1024) {
+ dprintk(KERN_WARNING
+ "%s: connect from unprivileged port: %u.%u.%u.%u:%d\n",
+ serv->sv_name,
+ NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port));
+ }
+
+ dprintk("%s: connect from %u.%u.%u.%u:%04x\n", serv->sv_name,
+ NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port));
+
+ /* make sure that a write doesn't block forever when
+ * low on memory
+ */
+ newsock->sk->sk_sndtimeo = HZ*30;
+
+ if (!(newsvsk = svc_setup_socket(serv, newsock, &err, 0)))
+ goto failed;
+
+
+ /* make sure that we don't have too many active connections.
+ * If we have, something must be dropped.
+ *
+ * There's no point in trying to do random drop here for
+ * DoS prevention. The NFS clients does 1 reconnect in 15
+ * seconds. An attacker can easily beat that.
+ *
+ * The only somewhat efficient mechanism would be if drop
+ * old connections from the same IP first. But right now
+ * we don't even record the client IP in svc_sock.
+ */
+ if (serv->sv_tmpcnt > (serv->sv_nrthreads+3)*20) {
+ struct svc_sock *svsk = NULL;
+ spin_lock_bh(&serv->sv_lock);
+ if (!list_empty(&serv->sv_tempsocks)) {
+ if (net_ratelimit()) {
+ /* Try to help the admin */
+ printk(KERN_NOTICE "%s: too many open TCP "
+ "sockets, consider increasing the "
+ "number of nfsd threads\n",
+ serv->sv_name);
+ printk(KERN_NOTICE "%s: last TCP connect from "
+ "%u.%u.%u.%u:%d\n",
+ serv->sv_name,
+ NIPQUAD(sin.sin_addr.s_addr),
+ ntohs(sin.sin_port));
+ }
+ /*
+ * Always select the oldest socket. It's not fair,
+ * but so is life
+ */
+ svsk = list_entry(serv->sv_tempsocks.prev,
+ struct svc_sock,
+ sk_list);
+ set_bit(SK_CLOSE, &svsk->sk_flags);
+ svsk->sk_inuse ++;
+ }
+ spin_unlock_bh(&serv->sv_lock);
+
+ if (svsk) {
+ svc_sock_enqueue(svsk);
+ svc_sock_put(svsk);
+ }
+
+ }
+
+ if (serv->sv_stats)
+ serv->sv_stats->nettcpconn++;
+
+ return;
+
+failed:
+ sock_release(newsock);
+ return;
+}
+
+/*
+ * Receive data from a TCP socket.
+ */
+static int
+svc_tcp_recvfrom(struct svc_rqst *rqstp)
+{
+ struct svc_sock *svsk = rqstp->rq_sock;
+ struct svc_serv *serv = svsk->sk_server;
+ int len;
+ struct kvec vec[RPCSVC_MAXPAGES];
+ int pnum, vlen;
+
+ dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
+ svsk, test_bit(SK_DATA, &svsk->sk_flags),
+ test_bit(SK_CONN, &svsk->sk_flags),
+ test_bit(SK_CLOSE, &svsk->sk_flags));
+
+ if ((rqstp->rq_deferred = svc_deferred_dequeue(svsk))) {
+ svc_sock_received(svsk);
+ return svc_deferred_recv(rqstp);
+ }
+
+ if (test_bit(SK_CLOSE, &svsk->sk_flags)) {
+ svc_delete_socket(svsk);
+ return 0;
+ }
+
+ if (test_bit(SK_CONN, &svsk->sk_flags)) {
+ svc_tcp_accept(svsk);
+ svc_sock_received(svsk);
+ return 0;
+ }
+
+ if (test_and_clear_bit(SK_CHNGBUF, &svsk->sk_flags))
+ /* sndbuf needs to have room for one request
+ * per thread, otherwise we can stall even when the
+ * network isn't a bottleneck.
+ * rcvbuf just needs to be able to hold a few requests.
+ * Normally they will be removed from the queue
+ * as soon a a complete request arrives.
+ */
+ svc_sock_setbufsize(svsk->sk_sock,
+ (serv->sv_nrthreads+3) * serv->sv_bufsz,
+ 3 * serv->sv_bufsz);
+
+ clear_bit(SK_DATA, &svsk->sk_flags);
+
+ /* Receive data. If we haven't got the record length yet, get
+ * the next four bytes. Otherwise try to gobble up as much as
+ * possible up to the complete record length.
+ */
+ if (svsk->sk_tcplen < 4) {
+ unsigned long want = 4 - svsk->sk_tcplen;
+ struct kvec iov;
+
+ iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
+ iov.iov_len = want;
+ if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
+ goto error;
+ svsk->sk_tcplen += len;
+
+ if (len < want) {
+ dprintk("svc: short recvfrom while reading record length (%d of %lu)\n",
+ len, want);
+ svc_sock_received(svsk);
+ return -EAGAIN; /* record header not complete */
+ }
+
+ svsk->sk_reclen = ntohl(svsk->sk_reclen);
+ if (!(svsk->sk_reclen & 0x80000000)) {
+ /* FIXME: technically, a record can be fragmented,
+ * and non-terminal fragments will not have the top
+ * bit set in the fragment length header.
+ * But apparently no known nfs clients send fragmented
+ * records. */
+ printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx (non-terminal)\n",
+ (unsigned long) svsk->sk_reclen);
+ goto err_delete;
+ }
+ svsk->sk_reclen &= 0x7fffffff;
+ dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
+ if (svsk->sk_reclen > serv->sv_bufsz) {
+ printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx (large)\n",
+ (unsigned long) svsk->sk_reclen);
+ goto err_delete;
+ }
+ }
+
+ /* Check whether enough data is available */
+ len = svc_recv_available(svsk);
+ if (len < 0)
+ goto error;
+
+ if (len < svsk->sk_reclen) {
+ dprintk("svc: incomplete TCP record (%d of %d)\n",
+ len, svsk->sk_reclen);
+ svc_sock_received(svsk);
+ return -EAGAIN; /* record not complete */
+ }
+ len = svsk->sk_reclen;
+ set_bit(SK_DATA, &svsk->sk_flags);
+
+ vec[0] = rqstp->rq_arg.head[0];
+ vlen = PAGE_SIZE;
+ pnum = 1;
+ while (vlen < len) {
+ vec[pnum].iov_base = page_address(rqstp->rq_argpages[rqstp->rq_argused++]);
+ vec[pnum].iov_len = PAGE_SIZE;
+ pnum++;
+ vlen += PAGE_SIZE;
+ }
+
+ /* Now receive data */
+ len = svc_recvfrom(rqstp, vec, pnum, len);
+ if (len < 0)
+ goto error;
+
+ dprintk("svc: TCP complete record (%d bytes)\n", len);
+ rqstp->rq_arg.len = len;
+ rqstp->rq_arg.page_base = 0;
+ if (len <= rqstp->rq_arg.head[0].iov_len) {
+ rqstp->rq_arg.head[0].iov_len = len;
+ rqstp->rq_arg.page_len = 0;
+ } else {
+ rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
+ }
+
+ rqstp->rq_skbuff = NULL;
+ rqstp->rq_prot = IPPROTO_TCP;
+
+ /* Reset TCP read info */
+ svsk->sk_reclen = 0;
+ svsk->sk_tcplen = 0;
+
+ svc_sock_received(svsk);
+ if (serv->sv_stats)
+ serv->sv_stats->nettcpcnt++;
+
+ return len;
+
+ err_delete:
+ svc_delete_socket(svsk);
+ return -EAGAIN;
+
+ error:
+ if (len == -EAGAIN) {
+ dprintk("RPC: TCP recvfrom got EAGAIN\n");
+ svc_sock_received(svsk);
+ } else {
+ printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
+ svsk->sk_server->sv_name, -len);
+ svc_sock_received(svsk);
+ }
+
+ return len;
+}
+
+/*
+ * Send out data on TCP socket.
+ */
+static int
+svc_tcp_sendto(struct svc_rqst *rqstp)
+{
+ struct xdr_buf *xbufp = &rqstp->rq_res;
+ int sent;
+ u32 reclen;
+
+ /* Set up the first element of the reply kvec.
+ * Any other kvecs that may be in use have been taken
+ * care of by the server implementation itself.
+ */
+ reclen = htonl(0x80000000|((xbufp->len ) - 4));
+ memcpy(xbufp->head[0].iov_base, &reclen, 4);
+
+ if (test_bit(SK_DEAD, &rqstp->rq_sock->sk_flags))
+ return -ENOTCONN;
+
+ sent = svc_sendto(rqstp, &rqstp->rq_res);
+ if (sent != xbufp->len) {
+ printk(KERN_NOTICE "rpc-srv/tcp: %s: %s %d when sending %d bytes - shutting down socket\n",
+ rqstp->rq_sock->sk_server->sv_name,
+ (sent<0)?"got error":"sent only",
+ sent, xbufp->len);
+ svc_delete_socket(rqstp->rq_sock);
+ sent = -EAGAIN;
+ }
+ return sent;
+}
+
+static void
+svc_tcp_init(struct svc_sock *svsk)
+{
+ struct sock *sk = svsk->sk_sk;
+ struct tcp_sock *tp = tcp_sk(sk);
+
+ svsk->sk_recvfrom = svc_tcp_recvfrom;
+ svsk->sk_sendto = svc_tcp_sendto;
+
+ if (sk->sk_state == TCP_LISTEN) {
+ dprintk("setting up TCP socket for listening\n");
+ sk->sk_data_ready = svc_tcp_listen_data_ready;
+ set_bit(SK_CONN, &svsk->sk_flags);
+ } else {
+ dprintk("setting up TCP socket for reading\n");
+ sk->sk_state_change = svc_tcp_state_change;
+ sk->sk_data_ready = svc_tcp_data_ready;
+ sk->sk_write_space = svc_write_space;
+
+ svsk->sk_reclen = 0;
+ svsk->sk_tcplen = 0;
+
+ tp->nonagle = 1; /* disable Nagle's algorithm */
+
+ /* initialise setting must have enough space to
+ * receive and respond to one request.
+ * svc_tcp_recvfrom will re-adjust if necessary
+ */
+ svc_sock_setbufsize(svsk->sk_sock,
+ 3 * svsk->sk_server->sv_bufsz,
+ 3 * svsk->sk_server->sv_bufsz);
+
+ set_bit(SK_CHNGBUF, &svsk->sk_flags);
+ set_bit(SK_DATA, &svsk->sk_flags);
+ if (sk->sk_state != TCP_ESTABLISHED)
+ set_bit(SK_CLOSE, &svsk->sk_flags);
+ }
+}
+
+void
+svc_sock_update_bufs(struct svc_serv *serv)
+{
+ /*
+ * The number of server threads has changed. Update
+ * rcvbuf and sndbuf accordingly on all sockets
+ */
+ struct list_head *le;
+
+ spin_lock_bh(&serv->sv_lock);
+ list_for_each(le, &serv->sv_permsocks) {
+ struct svc_sock *svsk =
+ list_entry(le, struct svc_sock, sk_list);
+ set_bit(SK_CHNGBUF, &svsk->sk_flags);
+ }
+ list_for_each(le, &serv->sv_tempsocks) {
+ struct svc_sock *svsk =
+ list_entry(le, struct svc_sock, sk_list);
+ set_bit(SK_CHNGBUF, &svsk->sk_flags);
+ }
+ spin_unlock_bh(&serv->sv_lock);
+}
+
+/*
+ * Receive the next request on any socket.
+ */
+int
+svc_recv(struct svc_serv *serv, struct svc_rqst *rqstp, long timeout)
+{
+ struct svc_sock *svsk =NULL;
+ int len;
+ int pages;
+ struct xdr_buf *arg;
+ DECLARE_WAITQUEUE(wait, current);
+
+ dprintk("svc: server %p waiting for data (to = %ld)\n",
+ rqstp, timeout);
+
+ if (rqstp->rq_sock)
+ printk(KERN_ERR
+ "svc_recv: service %p, socket not NULL!\n",
+ rqstp);
+ if (waitqueue_active(&rqstp->rq_wait))
+ printk(KERN_ERR
+ "svc_recv: service %p, wait queue active!\n",
+ rqstp);
+
+ /* Initialize the buffers */
+ /* first reclaim pages that were moved to response list */
+ svc_pushback_allpages(rqstp);
+
+ /* now allocate needed pages. If we get a failure, sleep briefly */
+ pages = 2 + (serv->sv_bufsz + PAGE_SIZE -1) / PAGE_SIZE;
+ while (rqstp->rq_arghi < pages) {
+ struct page *p = alloc_page(GFP_KERNEL);
+ if (!p) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(HZ/2);
+ continue;
+ }
+ rqstp->rq_argpages[rqstp->rq_arghi++] = p;
+ }
+
+ /* Make arg->head point to first page and arg->pages point to rest */
+ arg = &rqstp->rq_arg;
+ arg->head[0].iov_base = page_address(rqstp->rq_argpages[0]);
+ arg->head[0].iov_len = PAGE_SIZE;
+ rqstp->rq_argused = 1;
+ arg->pages = rqstp->rq_argpages + 1;
+ arg->page_base = 0;
+ /* save at least one page for response */
+ arg->page_len = (pages-2)*PAGE_SIZE;
+ arg->len = (pages-1)*PAGE_SIZE;
+ arg->tail[0].iov_len = 0;
+
+ try_to_freeze(PF_FREEZE);
+ if (signalled())
+ return -EINTR;
+
+ spin_lock_bh(&serv->sv_lock);
+ if (!list_empty(&serv->sv_tempsocks)) {
+ svsk = list_entry(serv->sv_tempsocks.next,
+ struct svc_sock, sk_list);
+ /* apparently the "standard" is that clients close
+ * idle connections after 5 minutes, servers after
+ * 6 minutes
+ * http://www.connectathon.org/talks96/nfstcp.pdf
+ */
+ if (get_seconds() - svsk->sk_lastrecv < 6*60
+ || test_bit(SK_BUSY, &svsk->sk_flags))
+ svsk = NULL;
+ }
+ if (svsk) {
+ set_bit(SK_BUSY, &svsk->sk_flags);
+ set_bit(SK_CLOSE, &svsk->sk_flags);
+ rqstp->rq_sock = svsk;
+ svsk->sk_inuse++;
+ } else if ((svsk = svc_sock_dequeue(serv)) != NULL) {
+ rqstp->rq_sock = svsk;
+ svsk->sk_inuse++;
+ rqstp->rq_reserved = serv->sv_bufsz;
+ svsk->sk_reserved += rqstp->rq_reserved;
+ } else {
+ /* No data pending. Go to sleep */
+ svc_serv_enqueue(serv, rqstp);
+
+ /*
+ * We have to be able to interrupt this wait
+ * to bring down the daemons ...
+ */
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue(&rqstp->rq_wait, &wait);
+ spin_unlock_bh(&serv->sv_lock);
+
+ schedule_timeout(timeout);
+
+ try_to_freeze(PF_FREEZE);
+
+ spin_lock_bh(&serv->sv_lock);
+ remove_wait_queue(&rqstp->rq_wait, &wait);
+
+ if (!(svsk = rqstp->rq_sock)) {
+ svc_serv_dequeue(serv, rqstp);
+ spin_unlock_bh(&serv->sv_lock);
+ dprintk("svc: server %p, no data yet\n", rqstp);
+ return signalled()? -EINTR : -EAGAIN;
+ }
+ }
+ spin_unlock_bh(&serv->sv_lock);
+
+ dprintk("svc: server %p, socket %p, inuse=%d\n",
+ rqstp, svsk, svsk->sk_inuse);
+ len = svsk->sk_recvfrom(rqstp);
+ dprintk("svc: got len=%d\n", len);
+
+ /* No data, incomplete (TCP) read, or accept() */
+ if (len == 0 || len == -EAGAIN) {
+ rqstp->rq_res.len = 0;
+ svc_sock_release(rqstp);
+ return -EAGAIN;
+ }
+ svsk->sk_lastrecv = get_seconds();
+ if (test_bit(SK_TEMP, &svsk->sk_flags)) {
+ /* push active sockets to end of list */
+ spin_lock_bh(&serv->sv_lock);
+ if (!list_empty(&svsk->sk_list))
+ list_move_tail(&svsk->sk_list, &serv->sv_tempsocks);
+ spin_unlock_bh(&serv->sv_lock);
+ }
+
+ rqstp->rq_secure = ntohs(rqstp->rq_addr.sin_port) < 1024;
+ rqstp->rq_chandle.defer = svc_defer;
+
+ if (serv->sv_stats)
+ serv->sv_stats->netcnt++;
+ return len;
+}
+
+/*
+ * Drop request
+ */
+void
+svc_drop(struct svc_rqst *rqstp)
+{
+ dprintk("svc: socket %p dropped request\n", rqstp->rq_sock);
+ svc_sock_release(rqstp);
+}
+
+/*
+ * Return reply to client.
+ */
+int
+svc_send(struct svc_rqst *rqstp)
+{
+ struct svc_sock *svsk;
+ int len;
+ struct xdr_buf *xb;
+
+ if ((svsk = rqstp->rq_sock) == NULL) {
+ printk(KERN_WARNING "NULL socket pointer in %s:%d\n",
+ __FILE__, __LINE__);
+ return -EFAULT;
+ }
+
+ /* release the receive skb before sending the reply */
+ svc_release_skb(rqstp);
+
+ /* calculate over-all length */
+ xb = & rqstp->rq_res;
+ xb->len = xb->head[0].iov_len +
+ xb->page_len +
+ xb->tail[0].iov_len;
+
+ /* Grab svsk->sk_sem to serialize outgoing data. */
+ down(&svsk->sk_sem);
+ if (test_bit(SK_DEAD, &svsk->sk_flags))
+ len = -ENOTCONN;
+ else
+ len = svsk->sk_sendto(rqstp);
+ up(&svsk->sk_sem);
+ svc_sock_release(rqstp);
+
+ if (len == -ECONNREFUSED || len == -ENOTCONN || len == -EAGAIN)
+ return 0;
+ return len;
+}
+
+/*
+ * Initialize socket for RPC use and create svc_sock struct
+ * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
+ */
+static struct svc_sock *
+svc_setup_socket(struct svc_serv *serv, struct socket *sock,
+ int *errp, int pmap_register)
+{
+ struct svc_sock *svsk;
+ struct sock *inet;
+
+ dprintk("svc: svc_setup_socket %p\n", sock);
+ if (!(svsk = kmalloc(sizeof(*svsk), GFP_KERNEL))) {
+ *errp = -ENOMEM;
+ return NULL;
+ }
+ memset(svsk, 0, sizeof(*svsk));
+
+ inet = sock->sk;
+
+ /* Register socket with portmapper */
+ if (*errp >= 0 && pmap_register)
+ *errp = svc_register(serv, inet->sk_protocol,
+ ntohs(inet_sk(inet)->sport));
+
+ if (*errp < 0) {
+ kfree(svsk);
+ return NULL;
+ }
+
+ set_bit(SK_BUSY, &svsk->sk_flags);
+ inet->sk_user_data = svsk;
+ svsk->sk_sock = sock;
+ svsk->sk_sk = inet;
+ svsk->sk_ostate = inet->sk_state_change;
+ svsk->sk_odata = inet->sk_data_ready;
+ svsk->sk_owspace = inet->sk_write_space;
+ svsk->sk_server = serv;
+ svsk->sk_lastrecv = get_seconds();
+ INIT_LIST_HEAD(&svsk->sk_deferred);
+ INIT_LIST_HEAD(&svsk->sk_ready);
+ sema_init(&svsk->sk_sem, 1);
+
+ /* Initialize the socket */
+ if (sock->type == SOCK_DGRAM)
+ svc_udp_init(svsk);
+ else
+ svc_tcp_init(svsk);
+
+ spin_lock_bh(&serv->sv_lock);
+ if (!pmap_register) {
+ set_bit(SK_TEMP, &svsk->sk_flags);
+ list_add(&svsk->sk_list, &serv->sv_tempsocks);
+ serv->sv_tmpcnt++;
+ } else {
+ clear_bit(SK_TEMP, &svsk->sk_flags);
+ list_add(&svsk->sk_list, &serv->sv_permsocks);
+ }
+ spin_unlock_bh(&serv->sv_lock);
+
+ dprintk("svc: svc_setup_socket created %p (inet %p)\n",
+ svsk, svsk->sk_sk);
+
+ clear_bit(SK_BUSY, &svsk->sk_flags);
+ svc_sock_enqueue(svsk);
+ return svsk;
+}
+
+/*
+ * Create socket for RPC service.
+ */
+static int
+svc_create_socket(struct svc_serv *serv, int protocol, struct sockaddr_in *sin)
+{
+ struct svc_sock *svsk;
+ struct socket *sock;
+ int error;
+ int type;
+
+ dprintk("svc: svc_create_socket(%s, %d, %u.%u.%u.%u:%d)\n",
+ serv->sv_program->pg_name, protocol,
+ NIPQUAD(sin->sin_addr.s_addr),
+ ntohs(sin->sin_port));
+
+ if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
+ printk(KERN_WARNING "svc: only UDP and TCP "
+ "sockets supported\n");
+ return -EINVAL;
+ }
+ type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
+
+ if ((error = sock_create_kern(PF_INET, type, protocol, &sock)) < 0)
+ return error;
+
+ if (sin != NULL) {
+ if (type == SOCK_STREAM)
+ sock->sk->sk_reuse = 1; /* allow address reuse */
+ error = sock->ops->bind(sock, (struct sockaddr *) sin,
+ sizeof(*sin));
+ if (error < 0)
+ goto bummer;
+ }
+
+ if (protocol == IPPROTO_TCP) {
+ if ((error = sock->ops->listen(sock, 64)) < 0)
+ goto bummer;
+ }
+
+ if ((svsk = svc_setup_socket(serv, sock, &error, 1)) != NULL)
+ return 0;
+
+bummer:
+ dprintk("svc: svc_create_socket error = %d\n", -error);
+ sock_release(sock);
+ return error;
+}
+
+/*
+ * Remove a dead socket
+ */
+void
+svc_delete_socket(struct svc_sock *svsk)
+{
+ struct svc_serv *serv;
+ struct sock *sk;
+
+ dprintk("svc: svc_delete_socket(%p)\n", svsk);
+
+ serv = svsk->sk_server;
+ sk = svsk->sk_sk;
+
+ sk->sk_state_change = svsk->sk_ostate;
+ sk->sk_data_ready = svsk->sk_odata;
+ sk->sk_write_space = svsk->sk_owspace;
+
+ spin_lock_bh(&serv->sv_lock);
+
+ list_del_init(&svsk->sk_list);
+ list_del_init(&svsk->sk_ready);
+ if (!test_and_set_bit(SK_DEAD, &svsk->sk_flags))
+ if (test_bit(SK_TEMP, &svsk->sk_flags))
+ serv->sv_tmpcnt--;
+
+ if (!svsk->sk_inuse) {
+ spin_unlock_bh(&serv->sv_lock);
+ sock_release(svsk->sk_sock);
+ kfree(svsk);
+ } else {
+ spin_unlock_bh(&serv->sv_lock);
+ dprintk(KERN_NOTICE "svc: server socket destroy delayed\n");
+ /* svsk->sk_server = NULL; */
+ }
+}
+
+/*
+ * Make a socket for nfsd and lockd
+ */
+int
+svc_makesock(struct svc_serv *serv, int protocol, unsigned short port)
+{
+ struct sockaddr_in sin;
+
+ dprintk("svc: creating socket proto = %d\n", protocol);
+ sin.sin_family = AF_INET;
+ sin.sin_addr.s_addr = INADDR_ANY;
+ sin.sin_port = htons(port);
+ return svc_create_socket(serv, protocol, &sin);
+}
+
+/*
+ * Handle defer and revisit of requests
+ */
+
+static void svc_revisit(struct cache_deferred_req *dreq, int too_many)
+{
+ struct svc_deferred_req *dr = container_of(dreq, struct svc_deferred_req, handle);
+ struct svc_serv *serv = dreq->owner;
+ struct svc_sock *svsk;
+
+ if (too_many) {
+ svc_sock_put(dr->svsk);
+ kfree(dr);
+ return;
+ }
+ dprintk("revisit queued\n");
+ svsk = dr->svsk;
+ dr->svsk = NULL;
+ spin_lock_bh(&serv->sv_lock);
+ list_add(&dr->handle.recent, &svsk->sk_deferred);
+ spin_unlock_bh(&serv->sv_lock);
+ set_bit(SK_DEFERRED, &svsk->sk_flags);
+ svc_sock_enqueue(svsk);
+ svc_sock_put(svsk);
+}
+
+static struct cache_deferred_req *
+svc_defer(struct cache_req *req)
+{
+ struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle);
+ int size = sizeof(struct svc_deferred_req) + (rqstp->rq_arg.len);
+ struct svc_deferred_req *dr;
+
+ if (rqstp->rq_arg.page_len)
+ return NULL; /* if more than a page, give up FIXME */
+ if (rqstp->rq_deferred) {
+ dr = rqstp->rq_deferred;
+ rqstp->rq_deferred = NULL;
+ } else {
+ int skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
+ /* FIXME maybe discard if size too large */
+ dr = kmalloc(size, GFP_KERNEL);
+ if (dr == NULL)
+ return NULL;
+
+ dr->handle.owner = rqstp->rq_server;
+ dr->prot = rqstp->rq_prot;
+ dr->addr = rqstp->rq_addr;
+ dr->argslen = rqstp->rq_arg.len >> 2;
+ memcpy(dr->args, rqstp->rq_arg.head[0].iov_base-skip, dr->argslen<<2);
+ }
+ spin_lock_bh(&rqstp->rq_server->sv_lock);
+ rqstp->rq_sock->sk_inuse++;
+ dr->svsk = rqstp->rq_sock;
+ spin_unlock_bh(&rqstp->rq_server->sv_lock);
+
+ dr->handle.revisit = svc_revisit;
+ return &dr->handle;
+}
+
+/*
+ * recv data from a deferred request into an active one
+ */
+static int svc_deferred_recv(struct svc_rqst *rqstp)
+{
+ struct svc_deferred_req *dr = rqstp->rq_deferred;
+
+ rqstp->rq_arg.head[0].iov_base = dr->args;
+ rqstp->rq_arg.head[0].iov_len = dr->argslen<<2;
+ rqstp->rq_arg.page_len = 0;
+ rqstp->rq_arg.len = dr->argslen<<2;
+ rqstp->rq_prot = dr->prot;
+ rqstp->rq_addr = dr->addr;
+ return dr->argslen<<2;
+}
+
+
+static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk)
+{
+ struct svc_deferred_req *dr = NULL;
+ struct svc_serv *serv = svsk->sk_server;
+
+ if (!test_bit(SK_DEFERRED, &svsk->sk_flags))
+ return NULL;
+ spin_lock_bh(&serv->sv_lock);
+ clear_bit(SK_DEFERRED, &svsk->sk_flags);
+ if (!list_empty(&svsk->sk_deferred)) {
+ dr = list_entry(svsk->sk_deferred.next,
+ struct svc_deferred_req,
+ handle.recent);
+ list_del_init(&dr->handle.recent);
+ set_bit(SK_DEFERRED, &svsk->sk_flags);
+ }
+ spin_unlock_bh(&serv->sv_lock);
+ return dr;
+}