|
|
@@ -0,0 +1,1021 @@
|
|
|
+/*
|
|
|
+ * linux/net/sunrpc/xprtsock.c
|
|
|
+ *
|
|
|
+ * Client-side transport implementation for sockets.
|
|
|
+ *
|
|
|
+ * TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com>
|
|
|
+ * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
|
|
|
+ * TCP NFS related read + write fixes
|
|
|
+ * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
|
|
|
+ *
|
|
|
+ * Rewrite of larges part of the code in order to stabilize TCP stuff.
|
|
|
+ * Fix behaviour when socket buffer is full.
|
|
|
+ * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
|
|
|
+ */
|
|
|
+
|
|
|
+#include <linux/types.h>
|
|
|
+#include <linux/slab.h>
|
|
|
+#include <linux/capability.h>
|
|
|
+#include <linux/sched.h>
|
|
|
+#include <linux/pagemap.h>
|
|
|
+#include <linux/errno.h>
|
|
|
+#include <linux/socket.h>
|
|
|
+#include <linux/in.h>
|
|
|
+#include <linux/net.h>
|
|
|
+#include <linux/mm.h>
|
|
|
+#include <linux/udp.h>
|
|
|
+#include <linux/tcp.h>
|
|
|
+#include <linux/sunrpc/clnt.h>
|
|
|
+#include <linux/file.h>
|
|
|
+
|
|
|
+#include <net/sock.h>
|
|
|
+#include <net/checksum.h>
|
|
|
+#include <net/udp.h>
|
|
|
+#include <net/tcp.h>
|
|
|
+
|
|
|
+#ifdef RPC_DEBUG
|
|
|
+# undef RPC_DEBUG_DATA
|
|
|
+# define RPCDBG_FACILITY RPCDBG_XPRT
|
|
|
+#endif
|
|
|
+
|
|
|
+#define XPRT_MAX_RESVPORT (800)
|
|
|
+
|
|
|
+#ifdef RPC_DEBUG_DATA
|
|
|
+/*
|
|
|
+ * Print the buffer contents (first 128 bytes only--just enough for
|
|
|
+ * diropres return).
|
|
|
+ */
|
|
|
+static void
|
|
|
+xprt_pktdump(char *msg, u32 *packet, unsigned int count)
|
|
|
+{
|
|
|
+ u8 *buf = (u8 *) packet;
|
|
|
+ int j;
|
|
|
+
|
|
|
+ dprintk("RPC: %s\n", msg);
|
|
|
+ for (j = 0; j < count && j < 128; j += 4) {
|
|
|
+ if (!(j & 31)) {
|
|
|
+ if (j)
|
|
|
+ dprintk("\n");
|
|
|
+ dprintk("0x%04x ", j);
|
|
|
+ }
|
|
|
+ dprintk("%02x%02x%02x%02x ",
|
|
|
+ buf[j], buf[j+1], buf[j+2], buf[j+3]);
|
|
|
+ }
|
|
|
+ dprintk("\n");
|
|
|
+}
|
|
|
+#else
|
|
|
+static inline void
|
|
|
+xprt_pktdump(char *msg, u32 *packet, unsigned int count)
|
|
|
+{
|
|
|
+ /* NOP */
|
|
|
+}
|
|
|
+#endif
|
|
|
+
|
|
|
+/*
|
|
|
+ * Look up RPC transport given an INET socket
|
|
|
+ */
|
|
|
+static inline struct rpc_xprt *
|
|
|
+xprt_from_sock(struct sock *sk)
|
|
|
+{
|
|
|
+ return (struct rpc_xprt *) sk->sk_user_data;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+xdr_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen,
|
|
|
+ struct xdr_buf *xdr, unsigned int base, int msgflags)
|
|
|
+{
|
|
|
+ struct page **ppage = xdr->pages;
|
|
|
+ unsigned int len, pglen = xdr->page_len;
|
|
|
+ int err, ret = 0;
|
|
|
+ ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
|
|
|
+
|
|
|
+ len = xdr->head[0].iov_len;
|
|
|
+ if (base < len || (addr != NULL && base == 0)) {
|
|
|
+ struct kvec iov = {
|
|
|
+ .iov_base = xdr->head[0].iov_base + base,
|
|
|
+ .iov_len = len - base,
|
|
|
+ };
|
|
|
+ struct msghdr msg = {
|
|
|
+ .msg_name = addr,
|
|
|
+ .msg_namelen = addrlen,
|
|
|
+ .msg_flags = msgflags,
|
|
|
+ };
|
|
|
+ if (xdr->len > len)
|
|
|
+ msg.msg_flags |= MSG_MORE;
|
|
|
+
|
|
|
+ if (iov.iov_len != 0)
|
|
|
+ err = kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
|
|
|
+ else
|
|
|
+ err = kernel_sendmsg(sock, &msg, NULL, 0, 0);
|
|
|
+ if (ret == 0)
|
|
|
+ ret = err;
|
|
|
+ else if (err > 0)
|
|
|
+ ret += err;
|
|
|
+ if (err != iov.iov_len)
|
|
|
+ goto out;
|
|
|
+ base = 0;
|
|
|
+ } else
|
|
|
+ base -= len;
|
|
|
+
|
|
|
+ if (pglen == 0)
|
|
|
+ goto copy_tail;
|
|
|
+ if (base >= pglen) {
|
|
|
+ base -= pglen;
|
|
|
+ goto copy_tail;
|
|
|
+ }
|
|
|
+ if (base || xdr->page_base) {
|
|
|
+ pglen -= base;
|
|
|
+ base += xdr->page_base;
|
|
|
+ ppage += base >> PAGE_CACHE_SHIFT;
|
|
|
+ base &= ~PAGE_CACHE_MASK;
|
|
|
+ }
|
|
|
+
|
|
|
+ sendpage = sock->ops->sendpage ? : sock_no_sendpage;
|
|
|
+ do {
|
|
|
+ int flags = msgflags;
|
|
|
+
|
|
|
+ len = PAGE_CACHE_SIZE;
|
|
|
+ if (base)
|
|
|
+ len -= base;
|
|
|
+ if (pglen < len)
|
|
|
+ len = pglen;
|
|
|
+
|
|
|
+ if (pglen != len || xdr->tail[0].iov_len != 0)
|
|
|
+ flags |= MSG_MORE;
|
|
|
+
|
|
|
+ /* Hmm... We might be dealing with highmem pages */
|
|
|
+ if (PageHighMem(*ppage))
|
|
|
+ sendpage = sock_no_sendpage;
|
|
|
+ err = sendpage(sock, *ppage, base, len, flags);
|
|
|
+ if (ret == 0)
|
|
|
+ ret = err;
|
|
|
+ else if (err > 0)
|
|
|
+ ret += err;
|
|
|
+ if (err != len)
|
|
|
+ goto out;
|
|
|
+ base = 0;
|
|
|
+ ppage++;
|
|
|
+ } while ((pglen -= len) != 0);
|
|
|
+copy_tail:
|
|
|
+ len = xdr->tail[0].iov_len;
|
|
|
+ if (base < len) {
|
|
|
+ struct kvec iov = {
|
|
|
+ .iov_base = xdr->tail[0].iov_base + base,
|
|
|
+ .iov_len = len - base,
|
|
|
+ };
|
|
|
+ struct msghdr msg = {
|
|
|
+ .msg_flags = msgflags,
|
|
|
+ };
|
|
|
+ err = kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
|
|
|
+ if (ret == 0)
|
|
|
+ ret = err;
|
|
|
+ else if (err > 0)
|
|
|
+ ret += err;
|
|
|
+ }
|
|
|
+out:
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Write data to socket.
|
|
|
+ */
|
|
|
+static inline int
|
|
|
+xprt_sendmsg(struct rpc_xprt *xprt, struct rpc_rqst *req)
|
|
|
+{
|
|
|
+ struct socket *sock = xprt->sock;
|
|
|
+ struct xdr_buf *xdr = &req->rq_snd_buf;
|
|
|
+ struct sockaddr *addr = NULL;
|
|
|
+ int addrlen = 0;
|
|
|
+ unsigned int skip;
|
|
|
+ int result;
|
|
|
+
|
|
|
+ if (!sock)
|
|
|
+ return -ENOTCONN;
|
|
|
+
|
|
|
+ xprt_pktdump("packet data:",
|
|
|
+ req->rq_svec->iov_base,
|
|
|
+ req->rq_svec->iov_len);
|
|
|
+
|
|
|
+ /* For UDP, we need to provide an address */
|
|
|
+ if (!xprt->stream) {
|
|
|
+ addr = (struct sockaddr *) &xprt->addr;
|
|
|
+ addrlen = sizeof(xprt->addr);
|
|
|
+ }
|
|
|
+ /* Dont repeat bytes */
|
|
|
+ skip = req->rq_bytes_sent;
|
|
|
+
|
|
|
+ clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
|
|
|
+ result = xdr_sendpages(sock, addr, addrlen, xdr, skip, MSG_DONTWAIT);
|
|
|
+
|
|
|
+ dprintk("RPC: xprt_sendmsg(%d) = %d\n", xdr->len - skip, result);
|
|
|
+
|
|
|
+ if (result >= 0)
|
|
|
+ return result;
|
|
|
+
|
|
|
+ switch (result) {
|
|
|
+ case -ECONNREFUSED:
|
|
|
+ /* When the server has died, an ICMP port unreachable message
|
|
|
+ * prompts ECONNREFUSED.
|
|
|
+ */
|
|
|
+ case -EAGAIN:
|
|
|
+ break;
|
|
|
+ case -ECONNRESET:
|
|
|
+ case -ENOTCONN:
|
|
|
+ case -EPIPE:
|
|
|
+ /* connection broken */
|
|
|
+ if (xprt->stream)
|
|
|
+ result = -ENOTCONN;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ printk(KERN_NOTICE "RPC: sendmsg returned error %d\n", -result);
|
|
|
+ }
|
|
|
+ return result;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+xprt_send_request(struct rpc_task *task)
|
|
|
+{
|
|
|
+ struct rpc_rqst *req = task->tk_rqstp;
|
|
|
+ struct rpc_xprt *xprt = req->rq_xprt;
|
|
|
+ int status, retry = 0;
|
|
|
+
|
|
|
+ /* set up everything as needed. */
|
|
|
+ /* Write the record marker */
|
|
|
+ if (xprt->stream) {
|
|
|
+ u32 *marker = req->rq_svec[0].iov_base;
|
|
|
+
|
|
|
+ *marker = htonl(0x80000000|(req->rq_slen-sizeof(*marker)));
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Continue transmitting the packet/record. We must be careful
|
|
|
+ * to cope with writespace callbacks arriving _after_ we have
|
|
|
+ * called xprt_sendmsg().
|
|
|
+ */
|
|
|
+ while (1) {
|
|
|
+ req->rq_xtime = jiffies;
|
|
|
+ status = xprt_sendmsg(xprt, req);
|
|
|
+
|
|
|
+ if (status < 0)
|
|
|
+ break;
|
|
|
+
|
|
|
+ if (xprt->stream) {
|
|
|
+ req->rq_bytes_sent += status;
|
|
|
+
|
|
|
+ /* If we've sent the entire packet, immediately
|
|
|
+ * reset the count of bytes sent. */
|
|
|
+ if (req->rq_bytes_sent >= req->rq_slen) {
|
|
|
+ req->rq_bytes_sent = 0;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ if (status >= req->rq_slen)
|
|
|
+ return 0;
|
|
|
+ status = -EAGAIN;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ dprintk("RPC: %4d xmit incomplete (%d left of %d)\n",
|
|
|
+ task->tk_pid, req->rq_slen - req->rq_bytes_sent,
|
|
|
+ req->rq_slen);
|
|
|
+
|
|
|
+ status = -EAGAIN;
|
|
|
+ if (retry++ > 50)
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (status == -EAGAIN) {
|
|
|
+ if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) {
|
|
|
+ /* Protect against races with xprt_write_space */
|
|
|
+ spin_lock_bh(&xprt->sock_lock);
|
|
|
+ /* Don't race with disconnect */
|
|
|
+ if (!xprt_connected(xprt))
|
|
|
+ task->tk_status = -ENOTCONN;
|
|
|
+ else if (test_bit(SOCK_NOSPACE, &xprt->sock->flags)) {
|
|
|
+ task->tk_timeout = req->rq_timeout;
|
|
|
+ rpc_sleep_on(&xprt->pending, task, NULL, NULL);
|
|
|
+ }
|
|
|
+ spin_unlock_bh(&xprt->sock_lock);
|
|
|
+ return status;
|
|
|
+ }
|
|
|
+ /* Keep holding the socket if it is blocked */
|
|
|
+ rpc_delay(task, HZ>>4);
|
|
|
+ }
|
|
|
+ return status;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Close down a transport socket
|
|
|
+ */
|
|
|
+static void
|
|
|
+xprt_close(struct rpc_xprt *xprt)
|
|
|
+{
|
|
|
+ struct socket *sock = xprt->sock;
|
|
|
+ struct sock *sk = xprt->inet;
|
|
|
+
|
|
|
+ if (!sk)
|
|
|
+ return;
|
|
|
+
|
|
|
+ write_lock_bh(&sk->sk_callback_lock);
|
|
|
+ xprt->inet = NULL;
|
|
|
+ xprt->sock = NULL;
|
|
|
+
|
|
|
+ sk->sk_user_data = NULL;
|
|
|
+ sk->sk_data_ready = xprt->old_data_ready;
|
|
|
+ sk->sk_state_change = xprt->old_state_change;
|
|
|
+ sk->sk_write_space = xprt->old_write_space;
|
|
|
+ write_unlock_bh(&sk->sk_callback_lock);
|
|
|
+
|
|
|
+ sk->sk_no_check = 0;
|
|
|
+
|
|
|
+ sock_release(sock);
|
|
|
+}
|
|
|
+
|
|
|
+static void xprt_socket_destroy(struct rpc_xprt *xprt)
|
|
|
+{
|
|
|
+ cancel_delayed_work(&xprt->sock_connect);
|
|
|
+ flush_scheduled_work();
|
|
|
+
|
|
|
+ xprt_disconnect(xprt);
|
|
|
+ xprt_close(xprt);
|
|
|
+ kfree(xprt->slot);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Input handler for RPC replies. Called from a bottom half and hence
|
|
|
+ * atomic.
|
|
|
+ */
|
|
|
+static void
|
|
|
+udp_data_ready(struct sock *sk, int len)
|
|
|
+{
|
|
|
+ struct rpc_task *task;
|
|
|
+ struct rpc_xprt *xprt;
|
|
|
+ struct rpc_rqst *rovr;
|
|
|
+ struct sk_buff *skb;
|
|
|
+ int err, repsize, copied;
|
|
|
+ u32 _xid, *xp;
|
|
|
+
|
|
|
+ read_lock(&sk->sk_callback_lock);
|
|
|
+ dprintk("RPC: udp_data_ready...\n");
|
|
|
+ if (!(xprt = xprt_from_sock(sk))) {
|
|
|
+ printk("RPC: udp_data_ready request not found!\n");
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+
|
|
|
+ dprintk("RPC: udp_data_ready client %p\n", xprt);
|
|
|
+
|
|
|
+ if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ if (xprt->shutdown)
|
|
|
+ goto dropit;
|
|
|
+
|
|
|
+ repsize = skb->len - sizeof(struct udphdr);
|
|
|
+ if (repsize < 4) {
|
|
|
+ printk("RPC: impossible RPC reply size %d!\n", repsize);
|
|
|
+ goto dropit;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Copy the XID from the skb... */
|
|
|
+ xp = skb_header_pointer(skb, sizeof(struct udphdr),
|
|
|
+ sizeof(_xid), &_xid);
|
|
|
+ if (xp == NULL)
|
|
|
+ goto dropit;
|
|
|
+
|
|
|
+ /* Look up and lock the request corresponding to the given XID */
|
|
|
+ spin_lock(&xprt->sock_lock);
|
|
|
+ rovr = xprt_lookup_rqst(xprt, *xp);
|
|
|
+ if (!rovr)
|
|
|
+ goto out_unlock;
|
|
|
+ task = rovr->rq_task;
|
|
|
+
|
|
|
+ dprintk("RPC: %4d received reply\n", task->tk_pid);
|
|
|
+
|
|
|
+ if ((copied = rovr->rq_private_buf.buflen) > repsize)
|
|
|
+ copied = repsize;
|
|
|
+
|
|
|
+ /* Suck it into the iovec, verify checksum if not done by hw. */
|
|
|
+ if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb))
|
|
|
+ goto out_unlock;
|
|
|
+
|
|
|
+ /* Something worked... */
|
|
|
+ dst_confirm(skb->dst);
|
|
|
+
|
|
|
+ xprt_complete_rqst(xprt, rovr, copied);
|
|
|
+
|
|
|
+ out_unlock:
|
|
|
+ spin_unlock(&xprt->sock_lock);
|
|
|
+ dropit:
|
|
|
+ skb_free_datagram(sk, skb);
|
|
|
+ out:
|
|
|
+ read_unlock(&sk->sk_callback_lock);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Copy from an skb into memory and shrink the skb.
|
|
|
+ */
|
|
|
+static inline size_t
|
|
|
+tcp_copy_data(skb_reader_t *desc, void *p, size_t len)
|
|
|
+{
|
|
|
+ if (len > desc->count)
|
|
|
+ len = desc->count;
|
|
|
+ if (skb_copy_bits(desc->skb, desc->offset, p, len)) {
|
|
|
+ dprintk("RPC: failed to copy %zu bytes from skb. %zu bytes remain\n",
|
|
|
+ len, desc->count);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ desc->offset += len;
|
|
|
+ desc->count -= len;
|
|
|
+ dprintk("RPC: copied %zu bytes from skb. %zu bytes remain\n",
|
|
|
+ len, desc->count);
|
|
|
+ return len;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * TCP read fragment marker
|
|
|
+ */
|
|
|
+static inline void
|
|
|
+tcp_read_fraghdr(struct rpc_xprt *xprt, skb_reader_t *desc)
|
|
|
+{
|
|
|
+ size_t len, used;
|
|
|
+ char *p;
|
|
|
+
|
|
|
+ p = ((char *) &xprt->tcp_recm) + xprt->tcp_offset;
|
|
|
+ len = sizeof(xprt->tcp_recm) - xprt->tcp_offset;
|
|
|
+ used = tcp_copy_data(desc, p, len);
|
|
|
+ xprt->tcp_offset += used;
|
|
|
+ if (used != len)
|
|
|
+ return;
|
|
|
+ xprt->tcp_reclen = ntohl(xprt->tcp_recm);
|
|
|
+ if (xprt->tcp_reclen & 0x80000000)
|
|
|
+ xprt->tcp_flags |= XPRT_LAST_FRAG;
|
|
|
+ else
|
|
|
+ xprt->tcp_flags &= ~XPRT_LAST_FRAG;
|
|
|
+ xprt->tcp_reclen &= 0x7fffffff;
|
|
|
+ xprt->tcp_flags &= ~XPRT_COPY_RECM;
|
|
|
+ xprt->tcp_offset = 0;
|
|
|
+ /* Sanity check of the record length */
|
|
|
+ if (xprt->tcp_reclen < 4) {
|
|
|
+ printk(KERN_ERR "RPC: Invalid TCP record fragment length\n");
|
|
|
+ xprt_disconnect(xprt);
|
|
|
+ }
|
|
|
+ dprintk("RPC: reading TCP record fragment of length %d\n",
|
|
|
+ xprt->tcp_reclen);
|
|
|
+}
|
|
|
+
|
|
|
+static void
|
|
|
+tcp_check_recm(struct rpc_xprt *xprt)
|
|
|
+{
|
|
|
+ dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u, tcp_flags = %lx\n",
|
|
|
+ xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen, xprt->tcp_flags);
|
|
|
+ if (xprt->tcp_offset == xprt->tcp_reclen) {
|
|
|
+ xprt->tcp_flags |= XPRT_COPY_RECM;
|
|
|
+ xprt->tcp_offset = 0;
|
|
|
+ if (xprt->tcp_flags & XPRT_LAST_FRAG) {
|
|
|
+ xprt->tcp_flags &= ~XPRT_COPY_DATA;
|
|
|
+ xprt->tcp_flags |= XPRT_COPY_XID;
|
|
|
+ xprt->tcp_copied = 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * TCP read xid
|
|
|
+ */
|
|
|
+static inline void
|
|
|
+tcp_read_xid(struct rpc_xprt *xprt, skb_reader_t *desc)
|
|
|
+{
|
|
|
+ size_t len, used;
|
|
|
+ char *p;
|
|
|
+
|
|
|
+ len = sizeof(xprt->tcp_xid) - xprt->tcp_offset;
|
|
|
+ dprintk("RPC: reading XID (%Zu bytes)\n", len);
|
|
|
+ p = ((char *) &xprt->tcp_xid) + xprt->tcp_offset;
|
|
|
+ used = tcp_copy_data(desc, p, len);
|
|
|
+ xprt->tcp_offset += used;
|
|
|
+ if (used != len)
|
|
|
+ return;
|
|
|
+ xprt->tcp_flags &= ~XPRT_COPY_XID;
|
|
|
+ xprt->tcp_flags |= XPRT_COPY_DATA;
|
|
|
+ xprt->tcp_copied = 4;
|
|
|
+ dprintk("RPC: reading reply for XID %08x\n",
|
|
|
+ ntohl(xprt->tcp_xid));
|
|
|
+ tcp_check_recm(xprt);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * TCP read and complete request
|
|
|
+ */
|
|
|
+static inline void
|
|
|
+tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc)
|
|
|
+{
|
|
|
+ struct rpc_rqst *req;
|
|
|
+ struct xdr_buf *rcvbuf;
|
|
|
+ size_t len;
|
|
|
+ ssize_t r;
|
|
|
+
|
|
|
+ /* Find and lock the request corresponding to this xid */
|
|
|
+ spin_lock(&xprt->sock_lock);
|
|
|
+ req = xprt_lookup_rqst(xprt, xprt->tcp_xid);
|
|
|
+ if (!req) {
|
|
|
+ xprt->tcp_flags &= ~XPRT_COPY_DATA;
|
|
|
+ dprintk("RPC: XID %08x request not found!\n",
|
|
|
+ ntohl(xprt->tcp_xid));
|
|
|
+ spin_unlock(&xprt->sock_lock);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ rcvbuf = &req->rq_private_buf;
|
|
|
+ len = desc->count;
|
|
|
+ if (len > xprt->tcp_reclen - xprt->tcp_offset) {
|
|
|
+ skb_reader_t my_desc;
|
|
|
+
|
|
|
+ len = xprt->tcp_reclen - xprt->tcp_offset;
|
|
|
+ memcpy(&my_desc, desc, sizeof(my_desc));
|
|
|
+ my_desc.count = len;
|
|
|
+ r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
|
|
|
+ &my_desc, tcp_copy_data);
|
|
|
+ desc->count -= r;
|
|
|
+ desc->offset += r;
|
|
|
+ } else
|
|
|
+ r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
|
|
|
+ desc, tcp_copy_data);
|
|
|
+
|
|
|
+ if (r > 0) {
|
|
|
+ xprt->tcp_copied += r;
|
|
|
+ xprt->tcp_offset += r;
|
|
|
+ }
|
|
|
+ if (r != len) {
|
|
|
+ /* Error when copying to the receive buffer,
|
|
|
+ * usually because we weren't able to allocate
|
|
|
+ * additional buffer pages. All we can do now
|
|
|
+ * is turn off XPRT_COPY_DATA, so the request
|
|
|
+ * will not receive any additional updates,
|
|
|
+ * and time out.
|
|
|
+ * Any remaining data from this record will
|
|
|
+ * be discarded.
|
|
|
+ */
|
|
|
+ xprt->tcp_flags &= ~XPRT_COPY_DATA;
|
|
|
+ dprintk("RPC: XID %08x truncated request\n",
|
|
|
+ ntohl(xprt->tcp_xid));
|
|
|
+ dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
|
|
|
+ xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+
|
|
|
+ dprintk("RPC: XID %08x read %Zd bytes\n",
|
|
|
+ ntohl(xprt->tcp_xid), r);
|
|
|
+ dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
|
|
|
+ xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
|
|
|
+
|
|
|
+ if (xprt->tcp_copied == req->rq_private_buf.buflen)
|
|
|
+ xprt->tcp_flags &= ~XPRT_COPY_DATA;
|
|
|
+ else if (xprt->tcp_offset == xprt->tcp_reclen) {
|
|
|
+ if (xprt->tcp_flags & XPRT_LAST_FRAG)
|
|
|
+ xprt->tcp_flags &= ~XPRT_COPY_DATA;
|
|
|
+ }
|
|
|
+
|
|
|
+out:
|
|
|
+ if (!(xprt->tcp_flags & XPRT_COPY_DATA)) {
|
|
|
+ dprintk("RPC: %4d received reply complete\n",
|
|
|
+ req->rq_task->tk_pid);
|
|
|
+ xprt_complete_rqst(xprt, req, xprt->tcp_copied);
|
|
|
+ }
|
|
|
+ spin_unlock(&xprt->sock_lock);
|
|
|
+ tcp_check_recm(xprt);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * TCP discard extra bytes from a short read
|
|
|
+ */
|
|
|
+static inline void
|
|
|
+tcp_read_discard(struct rpc_xprt *xprt, skb_reader_t *desc)
|
|
|
+{
|
|
|
+ size_t len;
|
|
|
+
|
|
|
+ len = xprt->tcp_reclen - xprt->tcp_offset;
|
|
|
+ if (len > desc->count)
|
|
|
+ len = desc->count;
|
|
|
+ desc->count -= len;
|
|
|
+ desc->offset += len;
|
|
|
+ xprt->tcp_offset += len;
|
|
|
+ dprintk("RPC: discarded %Zu bytes\n", len);
|
|
|
+ tcp_check_recm(xprt);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * TCP record receive routine
|
|
|
+ * We first have to grab the record marker, then the XID, then the data.
|
|
|
+ */
|
|
|
+static int
|
|
|
+tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
|
|
|
+ unsigned int offset, size_t len)
|
|
|
+{
|
|
|
+ struct rpc_xprt *xprt = rd_desc->arg.data;
|
|
|
+ skb_reader_t desc = {
|
|
|
+ .skb = skb,
|
|
|
+ .offset = offset,
|
|
|
+ .count = len,
|
|
|
+ .csum = 0
|
|
|
+ };
|
|
|
+
|
|
|
+ dprintk("RPC: tcp_data_recv\n");
|
|
|
+ do {
|
|
|
+ /* Read in a new fragment marker if necessary */
|
|
|
+ /* Can we ever really expect to get completely empty fragments? */
|
|
|
+ if (xprt->tcp_flags & XPRT_COPY_RECM) {
|
|
|
+ tcp_read_fraghdr(xprt, &desc);
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ /* Read in the xid if necessary */
|
|
|
+ if (xprt->tcp_flags & XPRT_COPY_XID) {
|
|
|
+ tcp_read_xid(xprt, &desc);
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ /* Read in the request data */
|
|
|
+ if (xprt->tcp_flags & XPRT_COPY_DATA) {
|
|
|
+ tcp_read_request(xprt, &desc);
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ /* Skip over any trailing bytes on short reads */
|
|
|
+ tcp_read_discard(xprt, &desc);
|
|
|
+ } while (desc.count);
|
|
|
+ dprintk("RPC: tcp_data_recv done\n");
|
|
|
+ return len - desc.count;
|
|
|
+}
|
|
|
+
|
|
|
+static void tcp_data_ready(struct sock *sk, int bytes)
|
|
|
+{
|
|
|
+ struct rpc_xprt *xprt;
|
|
|
+ read_descriptor_t rd_desc;
|
|
|
+
|
|
|
+ read_lock(&sk->sk_callback_lock);
|
|
|
+ dprintk("RPC: tcp_data_ready...\n");
|
|
|
+ if (!(xprt = xprt_from_sock(sk))) {
|
|
|
+ printk("RPC: tcp_data_ready socket info not found!\n");
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+ if (xprt->shutdown)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ /* We use rd_desc to pass struct xprt to tcp_data_recv */
|
|
|
+ rd_desc.arg.data = xprt;
|
|
|
+ rd_desc.count = 65536;
|
|
|
+ tcp_read_sock(sk, &rd_desc, tcp_data_recv);
|
|
|
+out:
|
|
|
+ read_unlock(&sk->sk_callback_lock);
|
|
|
+}
|
|
|
+
|
|
|
+static void
|
|
|
+tcp_state_change(struct sock *sk)
|
|
|
+{
|
|
|
+ struct rpc_xprt *xprt;
|
|
|
+
|
|
|
+ read_lock(&sk->sk_callback_lock);
|
|
|
+ if (!(xprt = xprt_from_sock(sk)))
|
|
|
+ goto out;
|
|
|
+ dprintk("RPC: tcp_state_change client %p...\n", xprt);
|
|
|
+ dprintk("RPC: state %x conn %d dead %d zapped %d\n",
|
|
|
+ sk->sk_state, xprt_connected(xprt),
|
|
|
+ sock_flag(sk, SOCK_DEAD),
|
|
|
+ sock_flag(sk, SOCK_ZAPPED));
|
|
|
+
|
|
|
+ switch (sk->sk_state) {
|
|
|
+ case TCP_ESTABLISHED:
|
|
|
+ spin_lock_bh(&xprt->sock_lock);
|
|
|
+ if (!xprt_test_and_set_connected(xprt)) {
|
|
|
+ /* Reset TCP record info */
|
|
|
+ xprt->tcp_offset = 0;
|
|
|
+ xprt->tcp_reclen = 0;
|
|
|
+ xprt->tcp_copied = 0;
|
|
|
+ xprt->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID;
|
|
|
+ rpc_wake_up(&xprt->pending);
|
|
|
+ }
|
|
|
+ spin_unlock_bh(&xprt->sock_lock);
|
|
|
+ break;
|
|
|
+ case TCP_SYN_SENT:
|
|
|
+ case TCP_SYN_RECV:
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ xprt_disconnect(xprt);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ out:
|
|
|
+ read_unlock(&sk->sk_callback_lock);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Called when more output buffer space is available for this socket.
|
|
|
+ * We try not to wake our writers until they can make "significant"
|
|
|
+ * progress, otherwise we'll waste resources thrashing sock_sendmsg
|
|
|
+ * with a bunch of small requests.
|
|
|
+ */
|
|
|
+static void
|
|
|
+xprt_write_space(struct sock *sk)
|
|
|
+{
|
|
|
+ struct rpc_xprt *xprt;
|
|
|
+ struct socket *sock;
|
|
|
+
|
|
|
+ read_lock(&sk->sk_callback_lock);
|
|
|
+ if (!(xprt = xprt_from_sock(sk)) || !(sock = sk->sk_socket))
|
|
|
+ goto out;
|
|
|
+ if (xprt->shutdown)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ /* Wait until we have enough socket memory */
|
|
|
+ if (xprt->stream) {
|
|
|
+ /* from net/core/stream.c:sk_stream_write_space */
|
|
|
+ if (sk_stream_wspace(sk) < sk_stream_min_wspace(sk))
|
|
|
+ goto out;
|
|
|
+ } else {
|
|
|
+ /* from net/core/sock.c:sock_def_write_space */
|
|
|
+ if (!sock_writeable(sk))
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ spin_lock_bh(&xprt->sock_lock);
|
|
|
+ if (xprt->snd_task)
|
|
|
+ rpc_wake_up_task(xprt->snd_task);
|
|
|
+ spin_unlock_bh(&xprt->sock_lock);
|
|
|
+out:
|
|
|
+ read_unlock(&sk->sk_callback_lock);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Set socket buffer length
|
|
|
+ */
|
|
|
+static void
|
|
|
+xprt_sock_setbufsize(struct rpc_xprt *xprt)
|
|
|
+{
|
|
|
+ struct sock *sk = xprt->inet;
|
|
|
+
|
|
|
+ if (xprt->stream)
|
|
|
+ return;
|
|
|
+ if (xprt->rcvsize) {
|
|
|
+ sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
|
|
|
+ sk->sk_rcvbuf = xprt->rcvsize * xprt->max_reqs * 2;
|
|
|
+ }
|
|
|
+ if (xprt->sndsize) {
|
|
|
+ sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
|
|
|
+ sk->sk_sndbuf = xprt->sndsize * xprt->max_reqs * 2;
|
|
|
+ sk->sk_write_space(sk);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Bind to a reserved port
|
|
|
+ */
|
|
|
+static inline int xprt_bindresvport(struct rpc_xprt *xprt, struct socket *sock)
|
|
|
+{
|
|
|
+ struct sockaddr_in myaddr = {
|
|
|
+ .sin_family = AF_INET,
|
|
|
+ };
|
|
|
+ int err, port;
|
|
|
+
|
|
|
+ /* Were we already bound to a given port? Try to reuse it */
|
|
|
+ port = xprt->port;
|
|
|
+ do {
|
|
|
+ myaddr.sin_port = htons(port);
|
|
|
+ err = sock->ops->bind(sock, (struct sockaddr *) &myaddr,
|
|
|
+ sizeof(myaddr));
|
|
|
+ if (err == 0) {
|
|
|
+ xprt->port = port;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ if (--port == 0)
|
|
|
+ port = XPRT_MAX_RESVPORT;
|
|
|
+ } while (err == -EADDRINUSE && port != xprt->port);
|
|
|
+
|
|
|
+ printk("RPC: Can't bind to reserved port (%d).\n", -err);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+static void
|
|
|
+xprt_bind_socket(struct rpc_xprt *xprt, struct socket *sock)
|
|
|
+{
|
|
|
+ struct sock *sk = sock->sk;
|
|
|
+
|
|
|
+ if (xprt->inet)
|
|
|
+ return;
|
|
|
+
|
|
|
+ write_lock_bh(&sk->sk_callback_lock);
|
|
|
+ sk->sk_user_data = xprt;
|
|
|
+ xprt->old_data_ready = sk->sk_data_ready;
|
|
|
+ xprt->old_state_change = sk->sk_state_change;
|
|
|
+ xprt->old_write_space = sk->sk_write_space;
|
|
|
+ if (xprt->prot == IPPROTO_UDP) {
|
|
|
+ sk->sk_data_ready = udp_data_ready;
|
|
|
+ sk->sk_no_check = UDP_CSUM_NORCV;
|
|
|
+ xprt_set_connected(xprt);
|
|
|
+ } else {
|
|
|
+ tcp_sk(sk)->nonagle = 1; /* disable Nagle's algorithm */
|
|
|
+ sk->sk_data_ready = tcp_data_ready;
|
|
|
+ sk->sk_state_change = tcp_state_change;
|
|
|
+ xprt_clear_connected(xprt);
|
|
|
+ }
|
|
|
+ sk->sk_write_space = xprt_write_space;
|
|
|
+
|
|
|
+ /* Reset to new socket */
|
|
|
+ xprt->sock = sock;
|
|
|
+ xprt->inet = sk;
|
|
|
+ write_unlock_bh(&sk->sk_callback_lock);
|
|
|
+
|
|
|
+ return;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Datastream sockets are created here, but xprt_connect will create
|
|
|
+ * and connect stream sockets.
|
|
|
+ */
|
|
|
+static struct socket * xprt_create_socket(struct rpc_xprt *xprt, int proto, int resvport)
|
|
|
+{
|
|
|
+ struct socket *sock;
|
|
|
+ int type, err;
|
|
|
+
|
|
|
+ dprintk("RPC: xprt_create_socket(%s %d)\n",
|
|
|
+ (proto == IPPROTO_UDP)? "udp" : "tcp", proto);
|
|
|
+
|
|
|
+ type = (proto == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
|
|
|
+
|
|
|
+ if ((err = sock_create_kern(PF_INET, type, proto, &sock)) < 0) {
|
|
|
+ printk("RPC: can't create socket (%d).\n", -err);
|
|
|
+ return NULL;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* If the caller has the capability, bind to a reserved port */
|
|
|
+ if (resvport && xprt_bindresvport(xprt, sock) < 0) {
|
|
|
+ printk("RPC: can't bind to reserved port.\n");
|
|
|
+ goto failed;
|
|
|
+ }
|
|
|
+
|
|
|
+ return sock;
|
|
|
+
|
|
|
+failed:
|
|
|
+ sock_release(sock);
|
|
|
+ return NULL;
|
|
|
+}
|
|
|
+
|
|
|
+static void xprt_socket_connect(void *args)
|
|
|
+{
|
|
|
+ struct rpc_xprt *xprt = (struct rpc_xprt *)args;
|
|
|
+ struct socket *sock = xprt->sock;
|
|
|
+ int status = -EIO;
|
|
|
+
|
|
|
+ if (xprt->shutdown || xprt->addr.sin_port == 0)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Start by resetting any existing state
|
|
|
+ */
|
|
|
+ xprt_close(xprt);
|
|
|
+ sock = xprt_create_socket(xprt, xprt->prot, xprt->resvport);
|
|
|
+ if (sock == NULL) {
|
|
|
+ /* couldn't create socket or bind to reserved port;
|
|
|
+ * this is likely a permanent error, so cause an abort */
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+ xprt_bind_socket(xprt, sock);
|
|
|
+ xprt_sock_setbufsize(xprt);
|
|
|
+
|
|
|
+ status = 0;
|
|
|
+ if (!xprt->stream)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Tell the socket layer to start connecting...
|
|
|
+ */
|
|
|
+ status = sock->ops->connect(sock, (struct sockaddr *) &xprt->addr,
|
|
|
+ sizeof(xprt->addr), O_NONBLOCK);
|
|
|
+ dprintk("RPC: %p connect status %d connected %d sock state %d\n",
|
|
|
+ xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
|
|
|
+ if (status < 0) {
|
|
|
+ switch (status) {
|
|
|
+ case -EINPROGRESS:
|
|
|
+ case -EALREADY:
|
|
|
+ goto out_clear;
|
|
|
+ }
|
|
|
+ }
|
|
|
+out:
|
|
|
+ if (status < 0)
|
|
|
+ rpc_wake_up_status(&xprt->pending, status);
|
|
|
+ else
|
|
|
+ rpc_wake_up(&xprt->pending);
|
|
|
+out_clear:
|
|
|
+ smp_mb__before_clear_bit();
|
|
|
+ clear_bit(XPRT_CONNECTING, &xprt->sockstate);
|
|
|
+ smp_mb__after_clear_bit();
|
|
|
+}
|
|
|
+
|
|
|
+static void
|
|
|
+xprt_connect_sock(struct rpc_task *task)
|
|
|
+{
|
|
|
+ struct rpc_xprt *xprt = task->tk_xprt;
|
|
|
+
|
|
|
+ if (!test_and_set_bit(XPRT_CONNECTING, &xprt->sockstate)) {
|
|
|
+ /* Note: if we are here due to a dropped connection
|
|
|
+ * we delay reconnecting by RPC_REESTABLISH_TIMEOUT/HZ
|
|
|
+ * seconds
|
|
|
+ */
|
|
|
+ if (xprt->sock != NULL)
|
|
|
+ schedule_delayed_work(&xprt->sock_connect,
|
|
|
+ RPC_REESTABLISH_TIMEOUT);
|
|
|
+ else {
|
|
|
+ schedule_work(&xprt->sock_connect);
|
|
|
+ /* flush_scheduled_work can sleep... */
|
|
|
+ if (!RPC_IS_ASYNC(task))
|
|
|
+ flush_scheduled_work();
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Set default timeout parameters
|
|
|
+ */
|
|
|
+static void
|
|
|
+xprt_default_timeout(struct rpc_timeout *to, int proto)
|
|
|
+{
|
|
|
+ if (proto == IPPROTO_UDP)
|
|
|
+ xprt_set_timeout(to, 5, 5 * HZ);
|
|
|
+ else
|
|
|
+ xprt_set_timeout(to, 2, 60 * HZ);
|
|
|
+}
|
|
|
+
|
|
|
+static struct rpc_xprt_ops xprt_socket_ops = {
|
|
|
+ .set_buffer_size = xprt_sock_setbufsize,
|
|
|
+ .connect = xprt_connect_sock,
|
|
|
+ .send_request = xprt_send_request,
|
|
|
+ .close = xprt_close,
|
|
|
+ .destroy = xprt_socket_destroy,
|
|
|
+};
|
|
|
+
|
|
|
+extern unsigned int xprt_udp_slot_table_entries;
|
|
|
+extern unsigned int xprt_tcp_slot_table_entries;
|
|
|
+
|
|
|
+int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to)
|
|
|
+{
|
|
|
+ size_t slot_table_size;
|
|
|
+
|
|
|
+ dprintk("RPC: setting up udp-ipv4 transport...\n");
|
|
|
+
|
|
|
+ xprt->max_reqs = xprt_udp_slot_table_entries;
|
|
|
+ slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]);
|
|
|
+ xprt->slot = kmalloc(slot_table_size, GFP_KERNEL);
|
|
|
+ if (xprt->slot == NULL)
|
|
|
+ return -ENOMEM;
|
|
|
+ memset(xprt->slot, 0, slot_table_size);
|
|
|
+
|
|
|
+ xprt->prot = IPPROTO_UDP;
|
|
|
+ xprt->port = XPRT_MAX_RESVPORT;
|
|
|
+ xprt->stream = 0;
|
|
|
+ xprt->nocong = 0;
|
|
|
+ xprt->cwnd = RPC_INITCWND;
|
|
|
+ xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
|
|
|
+ /* XXX: header size can vary due to auth type, IPv6, etc. */
|
|
|
+ xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
|
|
|
+
|
|
|
+ INIT_WORK(&xprt->sock_connect, xprt_socket_connect, xprt);
|
|
|
+
|
|
|
+ xprt->ops = &xprt_socket_ops;
|
|
|
+
|
|
|
+ if (to)
|
|
|
+ xprt->timeout = *to;
|
|
|
+ else
|
|
|
+ xprt_default_timeout(to, xprt->prot);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to)
|
|
|
+{
|
|
|
+ size_t slot_table_size;
|
|
|
+
|
|
|
+ dprintk("RPC: setting up tcp-ipv4 transport...\n");
|
|
|
+
|
|
|
+ xprt->max_reqs = xprt_tcp_slot_table_entries;
|
|
|
+ slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]);
|
|
|
+ xprt->slot = kmalloc(slot_table_size, GFP_KERNEL);
|
|
|
+ if (xprt->slot == NULL)
|
|
|
+ return -ENOMEM;
|
|
|
+ memset(xprt->slot, 0, slot_table_size);
|
|
|
+
|
|
|
+ xprt->prot = IPPROTO_TCP;
|
|
|
+ xprt->port = XPRT_MAX_RESVPORT;
|
|
|
+ xprt->stream = 1;
|
|
|
+ xprt->nocong = 1;
|
|
|
+ xprt->cwnd = RPC_MAXCWND(xprt);
|
|
|
+ xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
|
|
|
+ xprt->max_payload = (1U << 31) - 1;
|
|
|
+
|
|
|
+ INIT_WORK(&xprt->sock_connect, xprt_socket_connect, xprt);
|
|
|
+
|
|
|
+ xprt->ops = &xprt_socket_ops;
|
|
|
+
|
|
|
+ if (to)
|
|
|
+ xprt->timeout = *to;
|
|
|
+ else
|
|
|
+ xprt_default_timeout(to, xprt->prot);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
Chuck Lever