Release 4.15 net/sunrpc/xprtsock.c

Directory: net/sunrpc
// SPDX-License-Identifier: GPL-2.0
/*
 * linux/net/sunrpc/xprtsock.c
 *
 * Client-side transport implementation for sockets.
 *
 * TCP callback races fixes (C) 1998 Red Hat
 * TCP send fixes (C) 1998 Red Hat
 * 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>
 *
 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
 *
 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
 *   <gilles.quillard@bull.net>
 */

#include <linux/types.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/capability.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/un.h>
#include <linux/udp.h>
#include <linux/tcp.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/addr.h>
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/sunrpc/xprtsock.h>
#include <linux/file.h>
#ifdef CONFIG_SUNRPC_BACKCHANNEL
#include <linux/sunrpc/bc_xprt.h>
#endif

#include <net/sock.h>
#include <net/checksum.h>
#include <net/udp.h>
#include <net/tcp.h>

#include <trace/events/sunrpc.h>

#include "sunrpc.h"

static void xs_close(struct rpc_xprt *xprt);
static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
		struct socket *sock);

/*
 * xprtsock tunables
 */

static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;

static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;

static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;


static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;

static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;

#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)


#define XS_TCP_LINGER_TO	(15U * HZ)

static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;

/*
 * We can register our own files under /proc/sys/sunrpc by
 * calling register_sysctl_table() again.  The files in that
 * directory become the union of all files registered there.
 *
 * We simply need to make sure that we don't collide with
 * someone else's file names!
 */


static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;

static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;

static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;

static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;

static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;


static struct ctl_table_header *sunrpc_table_header;

/*
 * FIXME: changing the UDP slot table size should also resize the UDP
 *        socket buffers for existing UDP transports
 */

static struct ctl_table xs_tunables_table[] = {
	{
		.procname	= "udp_slot_table_entries",
		.data		= &xprt_udp_slot_table_entries,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &min_slot_table_size,
		.extra2		= &max_slot_table_size
	},
	{
		.procname	= "tcp_slot_table_entries",
		.data		= &xprt_tcp_slot_table_entries,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &min_slot_table_size,
		.extra2		= &max_slot_table_size
	},
	{
		.procname	= "tcp_max_slot_table_entries",
		.data		= &xprt_max_tcp_slot_table_entries,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &min_slot_table_size,
		.extra2		= &max_tcp_slot_table_limit
	},
	{
		.procname	= "min_resvport",
		.data		= &xprt_min_resvport,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &xprt_min_resvport_limit,
		.extra2		= &xprt_max_resvport
	},
	{
		.procname	= "max_resvport",
		.data		= &xprt_max_resvport,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &xprt_min_resvport,
		.extra2		= &xprt_max_resvport_limit
	},
	{
		.procname	= "tcp_fin_timeout",
		.data		= &xs_tcp_fin_timeout,
		.maxlen		= sizeof(xs_tcp_fin_timeout),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_jiffies,
        },
	{ },
};


static struct ctl_table sunrpc_table[] = {
	{
		.procname	= "sunrpc",
		.mode		= 0555,
		.child		= xs_tunables_table
	},
	{ },
};

#endif

/*
 * Wait duration for a reply from the RPC portmapper.
 */

#define XS_BIND_TO		(60U * HZ)

/*
 * Delay if a UDP socket connect error occurs.  This is most likely some
 * kind of resource problem on the local host.
 */

#define XS_UDP_REEST_TO		(2U * HZ)

/*
 * The reestablish timeout allows clients to delay for a bit before attempting
 * to reconnect to a server that just dropped our connection.
 *
 * We implement an exponential backoff when trying to reestablish a TCP
 * transport connection with the server.  Some servers like to drop a TCP
 * connection when they are overworked, so we start with a short timeout and
 * increase over time if the server is down or not responding.
 */

#define XS_TCP_INIT_REEST_TO	(3U * HZ)

/*
 * TCP idle timeout; client drops the transport socket if it is idle
 * for this long.  Note that we also timeout UDP sockets to prevent
 * holding port numbers when there is no RPC traffic.
 */

#define XS_IDLE_DISC_TO		(5U * 60 * HZ)

#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)

# undef  RPC_DEBUG_DATA

# define RPCDBG_FACILITY	RPCDBG_TRANS
#endif

#ifdef RPC_DEBUG_DATA


static void xs_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");
}
Contributors
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Chuck Lever 121 100.00% 3 100.00%
Total 121 100.00% 3 100.00%

#else


static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
{
	/* NOP */
}
Contributors
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Chuck Lever 20 100.00% 2 100.00%
Total 20 100.00% 2 100.00%

#endif



static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
{
	return (struct rpc_xprt *) sk->sk_user_data;
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
{
	return (struct sockaddr *) &xprt->addr;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 25 100.00% 2 100.00%
Total 25 100.00% 2 100.00%



static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
{
	return (struct sockaddr_un *) &xprt->addr;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
{
	return (struct sockaddr_in *) &xprt->addr;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 25 100.00% 2 100.00%
Total 25 100.00% 2 100.00%



static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
{
	return (struct sockaddr_in6 *) &xprt->addr;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
{
	struct sockaddr *sap = xs_addr(xprt);
	struct sockaddr_in6 *sin6;
	struct sockaddr_in *sin;
	struct sockaddr_un *sun;
	char buf[128];

	switch (sap->sa_family) {
	case AF_LOCAL:
		sun = xs_addr_un(xprt);
		strlcpy(buf, sun->sun_path, sizeof(buf));
		xprt->address_strings[RPC_DISPLAY_ADDR] =
						kstrdup(buf, GFP_KERNEL);
		break;
	case AF_INET:
		(void)rpc_ntop(sap, buf, sizeof(buf));
		xprt->address_strings[RPC_DISPLAY_ADDR] =
						kstrdup(buf, GFP_KERNEL);
		sin = xs_addr_in(xprt);
		snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
		break;
	case AF_INET6:
		(void)rpc_ntop(sap, buf, sizeof(buf));
		xprt->address_strings[RPC_DISPLAY_ADDR] =
						kstrdup(buf, GFP_KERNEL);
		sin6 = xs_addr_in6(xprt);
		snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
		break;
	default:
		BUG();
	}

	xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 221 98.22% 7 70.00%
Joe Perches 2 0.89% 1 10.00%
Harvey Harrison 1 0.44% 1 10.00%
Talpey, Thomas 1 0.44% 1 10.00%
Total 225 100.00% 10 100.00%



static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
{
	struct sockaddr *sap = xs_addr(xprt);
	char buf[128];

	snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
	xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);

	snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
	xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 89 100.00% 4 100.00%
Total 89 100.00% 4 100.00%



static void xs_format_peer_addresses(struct rpc_xprt *xprt,
				     const char *protocol,
				     const char *netid)
{
	xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
	xprt->address_strings[RPC_DISPLAY_NETID] = netid;
	xs_format_common_peer_addresses(xprt);
	xs_format_common_peer_ports(xprt);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 49 100.00% 6 100.00%
Total 49 100.00% 6 100.00%



static void xs_update_peer_port(struct rpc_xprt *xprt)
{
	kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
	kfree(xprt->address_strings[RPC_DISPLAY_PORT]);

	xs_format_common_peer_ports(xprt);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 30 83.33% 4 80.00%
Talpey, Thomas 6 16.67% 1 20.00%
Total 36 100.00% 5 100.00%



static void xs_free_peer_addresses(struct rpc_xprt *xprt)
{
	unsigned int i;

	for (i = 0; i < RPC_DISPLAY_MAX; i++)
		switch (i) {
		case RPC_DISPLAY_PROTO:
		case RPC_DISPLAY_NETID:
			continue;
		default:
			kfree(xprt->address_strings[i]);
		}
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 52 100.00% 2 100.00%
Total 52 100.00% 2 100.00%


#define XS_SENDMSG_FLAGS	(MSG_DONTWAIT | MSG_NOSIGNAL)



static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
{
	struct msghdr msg = {
		.msg_name	= addr,
		.msg_namelen	= addrlen,
		.msg_flags	= XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
        };
	struct kvec iov = {
		.iov_base	= vec->iov_base + base,
		.iov_len	= vec->iov_len - base,
        };

	if (iov.iov_len != 0)
		return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
	return kernel_sendmsg(sock, &msg, NULL, 0, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 89 71.20% 2 66.67%
Trond Myklebust 36 28.80% 1 33.33%
Total 125 100.00% 3 100.00%



static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
{
	ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
			int offset, size_t size, int flags);
	struct page **ppage;
	unsigned int remainder;
	int err;

	remainder = xdr->page_len - base;
	base += xdr->page_base;
	ppage = xdr->pages + (base >> PAGE_SHIFT);
	base &= ~PAGE_MASK;
	do_sendpage = sock->ops->sendpage;
	if (!zerocopy)
		do_sendpage = sock_no_sendpage;
	for(;;) {
		unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
		int flags = XS_SENDMSG_FLAGS;

		remainder -= len;
		if (more)
			flags |= MSG_MORE;
		if (remainder != 0)
			flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE;
		err = do_sendpage(sock, *ppage, base, len, flags);
		if (remainder == 0 || err != len)
			break;
		*sent_p += err;
		ppage++;
		base = 0;
	}
	if (err > 0) {
		*sent_p += err;
		err = 0;
	}
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 170 75.56% 3 60.00%
Chuck Lever 40 17.78% 1 20.00%
Jason Baron 15 6.67% 1 20.00%
Total 225 100.00% 5 100.00%

/**
 * xs_sendpages - write pages directly to a socket
 * @sock: socket to send on
 * @addr: UDP only -- address of destination
 * @addrlen: UDP only -- length of destination address
 * @xdr: buffer containing this request
 * @base: starting position in the buffer
 * @zerocopy: true if it is safe to use sendpage()
 * @sent_p: return the total number of bytes successfully queued for sending
 *
 */


static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
{
	unsigned int remainder = xdr->len - base;
	int err = 0;
	int sent = 0;

	if (unlikely(!sock))
		return -ENOTSOCK;

	if (base != 0) {
		addr = NULL;
		addrlen = 0;
	}

	if (base < xdr->head[0].iov_len || addr != NULL) {
		unsigned int len = xdr->head[0].iov_len - base;
		remainder -= len;
		err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
		if (remainder == 0 || err != len)
			goto out;
		*sent_p += err;
		base = 0;
	} else
		base -= xdr->head[0].iov_len;

	if (base < xdr->page_len) {
		unsigned int len = xdr->page_len - base;
		remainder -= len;
		err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
		*sent_p += sent;
		if (remainder == 0 || sent != len)
			goto out;
		base = 0;
	} else
		base -= xdr->page_len;

	if (base >= xdr->tail[0].iov_len)
		return 0;
	err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
out:
	if (err > 0) {
		*sent_p += err;
		err = 0;
	}
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 172 54.78% 3 42.86%
Trond Myklebust 113 35.99% 3 42.86%
Jason Baron 29 9.24% 1 14.29%
Total 314 100.00% 7 100.00%



static void xs_nospace_callback(struct rpc_task *task)
{
	struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);

	transport->inet->sk_write_pending--;
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%

/**
 * xs_nospace - place task on wait queue if transmit was incomplete
 * @task: task to put to sleep
 *
 */


static int xs_nospace(struct rpc_task *task)
{
	struct rpc_rqst *req = task->tk_rqstp;
	struct rpc_xprt *xprt = req->rq_xprt;
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
	struct sock *sk = transport->inet;
	int ret = -EAGAIN;

	dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
			task->tk_pid, req->rq_slen - req->rq_bytes_sent,
			req->rq_slen);

	/* Protect against races with write_space */
	spin_lock_bh(&xprt->transport_lock);

	/* Don't race with disconnect */
	if (xprt_connected(xprt)) {
		/* wait for more buffer space */
		sk->sk_write_pending++;
		xprt_wait_for_buffer_space(task, xs_nospace_callback);
	} else
		ret = -ENOTCONN;

	spin_unlock_bh(&xprt->transport_lock);

	/* Race breaker in case memory is freed before above code is called */
	if (ret == -EAGAIN) {
		struct socket_wq *wq;

		rcu_read_lock();
		wq = rcu_dereference(sk->sk_wq);
		set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
		rcu_read_unlock();

		sk->sk_write_space(sk);
	}
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 89 50.57% 4 40.00%
Trond Myklebust 48 27.27% 5 50.00%
David Vrabel 39 22.16% 1 10.00%
Total 176 100.00% 10 100.00%

/*
 * Construct a stream transport record marker in @buf.
 */


static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
{
	u32 reclen = buf->len - sizeof(rpc_fraghdr);
	rpc_fraghdr *base = buf->head[0].iov_base;
	*base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 47 100.00% 1 100.00%
Total 47 100.00% 1 100.00%

/**
 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
 * @task: RPC task that manages the state of an RPC request
 *
 * Return values:
 *        0:    The request has been sent
 *   EAGAIN:    The socket was blocked, please call again later to
 *              complete the request
 * ENOTCONN:    Caller needs to invoke connect logic then call again
 *    other:    Some other error occured, the request was not sent
 */


static int xs_local_send_request(struct rpc_task *task)
{
	struct rpc_rqst *req = task->tk_rqstp;
	struct rpc_xprt *xprt = req->rq_xprt;
	struct sock_xprt *transport =
				container_of(xprt, struct sock_xprt, xprt);
	struct xdr_buf *xdr = &req->rq_snd_buf;
	int status;
	int sent = 0;

	xs_encode_stream_record_marker(&req->rq_snd_buf);

	xs_pktdump("packet data:",
			req->rq_svec->iov_base, req->rq_svec->iov_len);

	status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
			      true, &sent);
	dprintk("RPC:       %s(%u) = %d\n",
			__func__, xdr->len - req->rq_bytes_sent, status);

	if (status == -EAGAIN && sock_writeable(transport->inet))
		status = -ENOBUFS;

	if (likely(sent > 0) || status == 0) {
		req->rq_bytes_sent += sent;
		req->rq_xmit_bytes_sent += sent;
		if (likely(req->rq_bytes_sent >= req->rq_slen)) {
			req->rq_bytes_sent = 0;
			return 0;
		}
		status = -EAGAIN;
	}

	switch (status) {
	case -ENOBUFS:
		break;
	case -EAGAIN:
		status = xs_nospace(task);
		break;
	default:
		dprintk("RPC:       sendmsg returned unrecognized error %d\n",
			-status);
		/* fall through */
	case -EPIPE:
		xs_close(xprt);
		status = -ENOTCONN;
	}

	return status;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 183 72.33% 6 35.29%
Trond Myklebust 34 13.44% 8 47.06%
Neil Brown 19 7.51% 1 5.88%
Jason Baron 16 6.32% 1 5.88%
Gustavo A. R. Silva 1 0.40% 1 5.88%
Total 253 100.00% 17 100.00%

/**
 * xs_udp_send_request - write an RPC request to a UDP socket
 * @task: address of RPC task that manages the state of an RPC request
 *
 * Return values:
 *        0:    The request has been sent
 *   EAGAIN:    The socket was blocked, please call again later to
 *              complete the request
 * ENOTCONN:    Caller needs to invoke connect logic then call again
 *    other:    Some other error occurred, the request was not sent
 */


static int xs_udp_send_request(struct rpc_task *task)
{
	struct rpc_rqst *req = task->tk_rqstp;
	struct rpc_xprt *xprt = req->rq_xprt;
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
	struct xdr_buf *xdr = &req->rq_snd_buf;
	int sent = 0;
	int status;

	xs_pktdump("packet data:",
				req->rq_svec->iov_base,
				req->rq_svec->iov_len);

	if (!xprt_bound(xprt))
		return -ENOTCONN;
	status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
			      xdr, req->rq_bytes_sent, true, &sent);

	dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
			xdr->len - req->rq_bytes_sent, status);

	/* firewall is blocking us, don't return -EAGAIN or we end up looping */
	if (status == -EPERM)
		goto process_status;

	if (status == -EAGAIN && sock_writeable(transport->inet))
		status = -ENOBUFS;

	if (sent > 0 || status == 0) {
		req->rq_xmit_bytes_sent += sent;
		if (sent >= req->rq_slen)
			return 0;
		/* Still some bytes left; set up for a retry later. */
		status = -EAGAIN;
	}

process_status:
	switch (status) {
	case -ENOTSOCK:
		status = -ENOTCONN;
		/* Should we call xs_close() here? */
		break;
	case -EAGAIN:
		status = xs_nospace(task);
		break;
	case -ENETUNREACH:
	case -ENOBUFS:
	case -EPIPE:
	case -ECONNREFUSED:
	case -EPERM:
		/* When the server has died, an ICMP port unreachable message
                 * prompts ECONNREFUSED. */
		break;
	default:
		dprintk("RPC:       sendmsg returned unrecognized error %d\n",
			-status);
	}

	return status;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 191 72.08% 1 12.50%
Jason Baron 32 12.08% 2 25.00%
Trond Myklebust 23 8.68% 4 50.00%
Neil Brown 19 7.17% 1 12.50%
Total 265 100.00% 8 100.00%

/**
 * xs_tcp_send_request - write an RPC request to a TCP socket
 * @task: address of RPC task that manages the state of an RPC request
 *
 * Return values:
 *        0:    The request has been sent
 *   EAGAIN:    The socket was blocked, please call again later to
 *              complete the request
 * ENOTCONN:    Caller needs to invoke connect logic then call again
 *    other:    Some other error occurred, the request was not sent
 *
 * XXX: In the case of soft timeouts, should we eventually give up
 *      if sendmsg is not able to make progress?
 */


static int xs_tcp_send_request(struct rpc_task *task)
{
	struct rpc_rqst *req = task->tk_rqstp;
	struct rpc_xprt *xprt = req->rq_xprt;
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
	struct xdr_buf *xdr = &req->rq_snd_buf;
	bool zerocopy = true;
	bool vm_wait = false;
	int status;
	int sent;

	xs_encode_stream_record_marker(&req->rq_snd_buf);

	xs_pktdump("packet data:",
				req->rq_svec->iov_base,
				req->rq_svec->iov_len);
	/* Don't use zero copy if this is a resend. If the RPC call
         * completes while the socket holds a reference to the pages,
         * then we may end up resending corrupted data.
         */
	if (task->tk_flags & RPC_TASK_SENT)
		zerocopy = false;

	if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
		xs_tcp_set_socket_timeouts(xprt, transport->sock);

	/* Continue transmitting the packet/record. We must be careful
         * to cope with writespace callbacks arriving _after_ we have
         * called sendmsg(). */
	while (1) {
		sent = 0;
		status = xs_sendpages(transport->sock, NULL, 0, xdr,
				      req->rq_bytes_sent, zerocopy, &sent);

		dprintk("RPC:       xs_tcp_send_request(%u) = %d\n",
				xdr->len - req->rq_bytes_sent, status);

		/* If we've sent the entire packet, immediately
                 * reset the count of bytes sent. */
		req->rq_bytes_sent += sent;
		req->rq_xmit_bytes_sent += sent;
		if (likely(req->rq_bytes_sent >= req->rq_slen)) {
			req->rq_bytes_sent = 0;
			return 0;
		}

		WARN_ON_ONCE(sent == 0 && status == 0);

		if (status == -EAGAIN ) {
			/*
                         * Return EAGAIN if we're sure we're hitting the
                         * socket send buffer limits.
                         */
			if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
				break;
			/*
                         * Did we hit a memory allocation failure?
                         */
			if (sent == 0) {
				status = -ENOBUFS;
				if (vm_wait)
					break;
				/* Retry, knowing now that we're below the
                                 * socket send buffer limit
                                 */
				vm_wait = true;
			}
			continue;
		}
		if (status < 0)
			break;
		vm_wait = false;
	}

	switch (status) {
	case -ENOTSOCK:
		status = -ENOTCONN;
		/* Should we call xs_close() here? */
		break;
	case -EAGAIN:
		status = xs_nospace(task);
		break;
	case -ECONNRESET:
	case -ECONNREFUSED:
	case -ENOTCONN:
	case -EADDRINUSE:
	case -ENOBUFS:
	case -EPIPE:
		break;
	default:
		dprintk("RPC:       sendmsg returned unrecognized error %d\n",
			-status);
	}

	return status;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 190 53.67% 8 33.33%
Trond Myklebust 145 40.96% 14 58.33%
Jason Baron 13 3.67% 1 4.17%
Neil Brown 6 1.69% 1 4.17%
Total 354 100.00% 24 100.00%

/**
 * xs_tcp_release_xprt - clean up after a tcp transmission
 * @xprt: transport
 * @task: rpc task
 *
 * This cleans up if an error causes us to abort the transmission of a request.
 * In this case, the socket may need to be reset in order to avoid confusing
 * the server.
 */


static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
{
	struct rpc_rqst *req;

	if (task != xprt->snd_task)
		return;
	if (task == NULL)
		goto out_release;
	req = task->tk_rqstp;
	if (req == NULL)
		goto out_release;
	if (req->rq_bytes_sent == 0)
		goto out_release;
	if (req->rq_bytes_sent == req->rq_snd_buf.len)
		goto out_release;
	set_bit(XPRT_CLOSE_WAIT, &xprt->state);
out_release:
	xprt_release_xprt(xprt, task);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 99 100.00% 3 100.00%
Total 99 100.00% 3 100.00%



static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
{
	transport->old_data_ready = sk->sk_data_ready;
	transport->old_state_change = sk->sk_state_change;
	transport->old_write_space = sk->sk_write_space;
	transport->old_error_report = sk->sk_error_report;
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 48 100.00% 2 100.00%
Total 48 100.00% 2 100.00%



static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
{
	sk->sk_data_ready = transport->old_data_ready;
	sk->sk_state_change = transport->old_state_change;
	sk->sk_write_space = transport->old_write_space;
	sk->sk_error_report = transport->old_error_report;
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 48 100.00% 2 100.00%
Total 48 100.00% 2 100.00%



static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);

	clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 36 100.00% 1 100.00%
Total 36 100.00% 1 100.00%



static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
{
	smp_mb__before_atomic();
	clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
	clear_bit(XPRT_CLOSING, &xprt->state);
	xs_sock_reset_state_flags(xprt);
	smp_mb__after_atomic();
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 42 100.00% 2 100.00%
Total 42 100.00% 2 100.00%



static void xs_sock_mark_closed(struct rpc_xprt *xprt)
{
	xs_sock_reset_connection_flags(xprt);
	/* Mark transport as closed and wake up all pending tasks */
	xprt_disconnect_done(xprt);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 22 100.00% 1 100.00%
Total 22 100.00% 1 100.00%

/**
 * xs_error_report - callback to handle TCP socket state errors
 * @sk: socket
 *
 * Note: we don't call sock_error() since there may be a rpc_task
 * using the socket, and so we don't want to clear sk->sk_err.
 */


static void xs_error_report(struct sock *sk)
{
	struct rpc_xprt *xprt;
	int err;

	read_lock_bh(&sk->sk_callback_lock);
	if (!(xprt = xprt_from_sock(sk)))
		goto out;

	err = -sk->sk_err;
	if (err == 0)
		goto out;
	/* Is this a reset event? */
	if (sk->sk_state == TCP_CLOSE)
		xs_sock_mark_closed(xprt);
	dprintk("RPC:       xs_error_report client %p, error=%d...\n",
			xprt, -err);
	trace_rpc_socket_error(xprt, sk->sk_socket, err);
	xprt_wake_pending_tasks(xprt, err);
 out:
	read_unlock_bh(&sk->sk_callback_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 110 100.00% 4 100.00%
Total 110 100.00% 4 100.00%



static void xs_reset_transport(struct sock_xprt *transport)
{
	struct socket *sock = transport->sock;
	struct sock *sk = transport->inet;
	struct rpc_xprt *xprt = &transport->xprt;

	if (sk == NULL)
		return;

	if (atomic_read(&transport->xprt.swapper))
		sk_clear_memalloc(sk);

	kernel_sock_shutdown(sock, SHUT_RDWR);

	mutex_lock(&transport->recv_mutex);
	write_lock_bh(&sk->sk_callback_lock);
	transport->inet = NULL;
	transport->sock = NULL;

	sk->sk_user_data = NULL;

	xs_restore_old_callbacks(transport, sk);
	xprt_clear_connected(xprt);
	write_unlock_bh(&sk->sk_callback_lock);
	xs_sock_reset_connection_flags(xprt);
	mutex_unlock(&transport->recv_mutex);

	trace_rpc_socket_close(xprt, sock);
	sock_release(sock);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 78 52.35% 4 36.36%
Trond Myklebust 54 36.24% 6 54.55%
Jeff Layton 17 11.41% 1 9.09%
Total 149 100.00% 11 100.00%

/**
 * xs_close - close a socket
 * @xprt: transport
 *
 * This is used when all requests are complete; ie, no DRC state remains
 * on the server we want to save.
 *
 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
 * xs_reset_transport() zeroing the socket from underneath a writer.
 */


static void xs_close(struct rpc_xprt *xprt)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);

	dprintk("RPC:       xs_close xprt %p\n", xprt);

	xs_reset_transport(transport);
	xprt->reestablish_timeout = 0;

	xprt_disconnect_done(xprt);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 38 77.55% 4 57.14%
Neil Brown 6 12.24% 1 14.29%
Trond Myklebust 5 10.20% 2 28.57%
Total 49 100.00% 7 100.00%



static void xs_inject_disconnect(struct rpc_xprt *xprt)
{
	dprintk("RPC:       injecting transport disconnect on xprt=%p\n",
		xprt);
	xprt_disconnect_done(xprt);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 23 100.00% 1 100.00%
Total 23 100.00% 1 100.00%



static void xs_xprt_free(struct rpc_xprt *xprt)
{
	xs_free_peer_addresses(xprt);
	xprt_free(xprt);
}

Contributors
Person Tokens Prop Commits CommitProp
Kinglong Mee 21 100.00% 1 100.00%
Total 21 100.00% 1 100.00%

/**
 * xs_destroy - prepare to shutdown a transport
 * @xprt: doomed transport
 *
 */


static void xs_destroy(struct rpc_xprt *xprt)
{
	struct sock_xprt *transport = container_of(xprt,
			struct sock_xprt, xprt);
	dprintk("RPC:       xs_destroy xprt %p\n", xprt);

	cancel_delayed_work_sync(&transport->connect_worker);
	xs_close(xprt);
	cancel_work_sync(&transport->recv_worker);
	xs_xprt_free(xprt);
	module_put(THIS_MODULE);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 39 60.94% 3 60.00%
J. Bruce Fields 24 37.50% 1 20.00%
Kinglong Mee 1 1.56% 1 20.00%
Total 64 100.00% 5 100.00%



static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
{
	struct xdr_skb_reader desc = {
		.skb		= skb,
		.offset		= sizeof(rpc_fraghdr),
		.count		= skb->len - sizeof(rpc_fraghdr),
        };

	if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
		return -1;
	if (desc.count)
		return -1;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 80 100.00% 2 100.00%
Total 80 100.00% 2 100.00%

/**
 * xs_local_data_read_skb
 * @xprt: transport
 * @sk: socket
 * @skb: skbuff
 *
 * Currently this assumes we can read the whole reply in a single gulp.
 */


static void xs_local_data_read_skb(struct rpc_xprt *xprt,
		struct sock *sk,
		struct sk_buff *skb)
{
	struct rpc_task *task;
	struct rpc_rqst *rovr;
	int repsize, copied;
	u32 _xid;
	__be32 *xp;

	repsize = skb->len - sizeof(rpc_fraghdr);
	if (repsize < 4) {
		dprintk("RPC:       impossible RPC reply size %d\n", repsize);
		return;
	}

	/* Copy the XID from the skb... */
	xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
	if (xp == NULL)
		return;

	/* Look up and lock the request corresponding to the given XID */
	spin_lock(&xprt->recv_lock);
	rovr = xprt_lookup_rqst(xprt, *xp);
	if (!rovr)
		goto out_unlock;
	xprt_pin_rqst(rovr);
	spin_unlock(&xprt->recv_lock);
	task = rovr->rq_task;

	copied = rovr->rq_private_buf.buflen;
	if (copied > repsize)
		copied = repsize;

	if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
		dprintk("RPC:       sk_buff copy failed\n");
		spin_lock(&xprt->recv_lock);
		goto out_unpin;
	}

	spin_lock(&xprt->recv_lock);
	xprt_complete_rqst(task, copied);
out_unpin:
	xprt_unpin_rqst(rovr);
 out_unlock:
	spin_unlock(&xprt->recv_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 162 72.32% 4 44.44%
Trond Myklebust 55 24.55% 3 33.33%
Herbert Xu 5 2.23% 1 11.11%
Alexey Dobriyan 2 0.89% 1 11.11%
Total 224 100.00% 9 100.00%



static void xs_local_data_receive(struct sock_xprt *transport)
{
	struct sk_buff *skb;
	struct sock *sk;
	int err;

	mutex_lock(&transport->recv_mutex);
	sk = transport->inet;
	if (sk == NULL)
		goto out;
	for (;;) {
		skb = skb_recv_datagram(sk, 0, 1, &err);
		if (skb != NULL) {
			xs_local_data_read_skb(&transport->xprt, sk, skb);
			skb_free_datagram(sk, skb);
			continue;
		}
		if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
			break;
	}
out:
	mutex_unlock(&transport->recv_mutex);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 108 90.00% 2 66.67%
Chuck Lever 12 10.00% 1 33.33%
Total 120 100.00% 3 100.00%



static void xs_local_data_receive_workfn(struct work_struct *work)
{
	struct sock_xprt *transport =
		container_of(work, struct sock_xprt, recv_worker);
	xs_local_data_receive(transport);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 28 90.32% 1 50.00%
Chuck Lever 3 9.68% 1 50.00%
Total 31 100.00% 2 100.00%

/**
 * xs_udp_data_read_skb - receive callback for UDP sockets
 * @xprt: transport
 * @sk: socket
 * @skb: skbuff
 *
 */


static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
		struct sock *sk,
		struct sk_buff *skb)
{
	struct rpc_task *task;
	struct rpc_rqst *rovr;
	int repsize, copied;
	u32 _xid;
	__be32 *xp;

	repsize = skb->len;
	if (repsize < 4) {
		dprintk("RPC:       impossible RPC reply size %d!\n", repsize);
		return;
	}

	/* Copy the XID from the skb... */
	xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
	if (xp == NULL)
		return;

	/* Look up and lock the request corresponding to the given XID */
	spin_lock(&xprt->recv_lock);
	rovr = xprt_lookup_rqst(xprt, *xp);
	if (!rovr)
		goto out_unlock;
	xprt_pin_rqst(rovr);
	spin_unlock(&xprt->recv_lock);
	task = rovr->rq_task;

	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)) {
		__UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
		spin_lock(&xprt->recv_lock);
		goto out_unpin;
	}

	__UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);

	spin_lock_bh(&xprt->transport_lock);
	xprt_adjust_cwnd(xprt, task, copied);
	spin_unlock_bh(&xprt->transport_lock);
	spin_lock(&xprt->recv_lock);
	xprt_complete_rqst(task, copied);
out_unpin:
	xprt_unpin_rqst(rovr);
 out_unlock:
	spin_unlock(&xprt->recv_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 175 69.72% 3 33.33%
Trond Myklebust 73 29.08% 4 44.44%
Eric Dumazet 2 0.80% 1 11.11%
Willem de Bruijn 1 0.40% 1 11.11%
Total 251 100.00% 9 100.00%



static void xs_udp_data_receive(struct sock_xprt *transport)
{
	struct sk_buff *skb;
	struct sock *sk;
	int err;

	mutex_lock(&transport->recv_mutex);
	sk = transport->inet;
	if (sk == NULL)
		goto out;
	for (;;) {
		skb = skb_recv_udp(sk, 0, 1, &err);
		if (skb != NULL) {
			xs_udp_data_read_skb(&transport->xprt, sk, skb);
			consume_skb(skb);
			continue;
		}
		if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
			break;
	}
out:
	mutex_unlock(&transport->recv_mutex);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 110 93.22% 2 40.00%
Chuck Lever 6 5.08% 1 20.00%
Paolo Abeni 2 1.69% 2 40.00%
Total 118 100.00% 5 100.00%



static void xs_udp_data_receive_workfn(struct work_struct *work)
{
	struct sock_xprt *transport =
		container_of(work, struct sock_xprt, recv_worker);
	xs_udp_data_receive(transport);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 31 100.00% 1 100.00%
Total 31 100.00% 1 100.00%

/**
 * xs_data_ready - "data ready" callback for UDP sockets
 * @sk: socket with data to read
 *
 */


static void xs_data_ready(struct sock *sk)
{
	struct rpc_xprt *xprt;

	read_lock_bh(&sk->sk_callback_lock);
	dprintk("RPC:       xs_data_ready...\n");
	xprt = xprt_from_sock(sk);
	if (xprt != NULL) {
		struct sock_xprt *transport = container_of(xprt,
				struct sock_xprt, xprt);
		transport->old_data_ready(sk);
		/* Any data means we had a useful conversation, so
                 * then we don't need to delay the next reconnect
                 */
		if (xprt->reestablish_timeout)
			xprt->reestablish_timeout = 0;
		if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
			queue_work(xprtiod_workqueue, &transport->recv_worker);
	}
	read_unlock_bh(&sk->sk_callback_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 101 91.82% 4 80.00%
Chuck Lever 9 8.18% 1 20.00%
Total 110 100.00% 5 100.00%

/*
 * Helper function to force a TCP close if the server is sending
 * junk and/or it has put us in CLOSE_WAIT
 */


static void xs_tcp_force_close(struct rpc_xprt *xprt)
{
	xprt_force_disconnect(xprt);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 16 100.00% 1 100.00%
Total 16 100.00% 1 100.00%



static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
	size_t len, used;
	char *p;

	p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
	len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
	used = xdr_skb_read_bits(desc, p, len);
	transport->tcp_offset += used;
	if (used != len)
		return;

	transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
	if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
		transport->tcp_flags |= TCP_RCV_LAST_FRAG;
	else
		transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
	transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;

	transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
	transport->tcp_offset = 0;

	/* Sanity check of the record length */
	if (unlikely(transport->tcp_reclen < 8)) {
		dprintk("RPC:       invalid TCP record fragment length\n");
		xs_tcp_force_close(xprt);
		return;
	}
	dprintk("RPC:       reading TCP record fragment of length %d\n",
			transport->tcp_reclen);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 179 98.90% 7 77.78%
Trond Myklebust 1 0.55% 1 11.11%
Ricardo Labiaga 1 0.55% 1 11.11%
Total 181 100.00% 9 100.00%



static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
{
	if (transport->tcp_offset == transport->tcp_reclen) {
		transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
		transport->tcp_offset = 0;
		if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
			transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
			transport->tcp_flags |= TCP_RCV_COPY_XID;
			transport->tcp_copied = 0;
		}
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 64 100.00% 3 100.00%
Total 64 100.00% 3 100.00%



static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
{
	size_t len, used;
	char *p;

	len = sizeof(transport->tcp_xid) - transport->tcp_offset;
	dprintk("RPC:       reading XID (%zu bytes)\n", len);
	p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
	used = xdr_skb_read_bits(desc, p, len);
	transport->tcp_offset += used;
	if (used != len)
		return;
	transport->tcp_flags &= ~TCP_RCV_COPY_XID;
	transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
	transport->tcp_copied = 4;
	dprintk("RPC:       reading %s XID %08x\n",
			(transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
							      : "request with",
			ntohl(transport->tcp_xid));
	xs_tcp_check_fraghdr(transport);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 120 88.89% 6 66.67%
Ricardo Labiaga 14 10.37% 2 22.22%
Alexey Dobriyan 1 0.74% 1 11.11%
Total 135 100.00% 9 100.00%



static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
				       struct xdr_skb_reader *desc)
{
	size_t len, used;
	u32 offset;
	char *p;

	/*
         * We want transport->tcp_offset to be 8 at the end of this routine
         * (4 bytes for the xid and 4 bytes for the call/reply flag).
         * When this function is called for the first time,
         * transport->tcp_offset is 4 (after having already read the xid).
         */
	offset = transport->tcp_offset - sizeof(transport->tcp_xid);
	len = sizeof(transport->tcp_calldir) - offset;
	dprintk("RPC:       reading CALL/REPLY flag (%zu bytes)\n", len);
	p = ((char *) &transport->tcp_calldir) + offset;
	used = xdr_skb_read_bits(desc, p, len);
	transport->tcp_offset += used;
	if (used != len)
		return;
	transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
	/*
         * We don't yet have the XDR buffer, so we will write the calldir
         * out after we get the buffer from the 'struct rpc_rqst'
         */
	switch (ntohl(transport->tcp_calldir)) {
	case RPC_REPLY:
		transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
		transport->tcp_flags |= TCP_RCV_COPY_DATA;
		transport->tcp_flags |= TCP_RPC_REPLY;
		break;
	case RPC_CALL:
		transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
		transport->tcp_flags |= TCP_RCV_COPY_DATA;
		transport->tcp_flags &= ~TCP_RPC_REPLY;
		break;
	default:
		dprintk("RPC:       invalid request message type\n");
		xs_tcp_force_close(&transport->xprt);
	}
	xs_tcp_check_fraghdr(transport);
}

Contributors
Person Tokens Prop Commits CommitProp
Ricardo Labiaga 73 39.89% 2 22.22%
Trond Myklebust 62 33.88% 2 22.22%
Chuck Lever 47 25.68% 4 44.44%
Alexey Dobriyan 1 0.55% 1 11.11%
Total 183 100.00% 9 100.00%



static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
				     struct xdr_skb_reader *desc,
				     struct rpc_rqst *req)
{
	struct sock_xprt *transport =
				container_of(xprt, struct sock_xprt, xprt);
	struct xdr_buf *rcvbuf;
	size_t len;
	ssize_t r;

	rcvbuf = &req->rq_private_buf;

	if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
		/*
                 * Save the RPC direction in the XDR buffer
                 */
		memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
			&transport->tcp_calldir,
			sizeof(transport->tcp_calldir));
		transport->tcp_copied += sizeof(transport->tcp_calldir);
		transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
	}

	len = desc->count;
	if (len > transport->tcp_reclen - transport->tcp_offset)
		desc->count = transport->tcp_reclen - transport->tcp_offset;
	r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
					  desc, xdr_skb_read_bits);

	if (desc->count) {
		/* 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 TCP_RCV_COPY_DATA, so the request
                 * will not receive any additional updates,
                 * and time out.
                 * Any remaining data from this record will
                 * be discarded.
                 */
		transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
		dprintk("RPC:       XID %08x truncated request\n",
				ntohl(transport->tcp_xid));
		dprintk("RPC:       xprt = %p, tcp_copied = %lu, "
				"tcp_offset = %u, tcp_reclen = %u\n",
				xprt, transport->tcp_copied,
				transport->tcp_offset, transport->tcp_reclen);
		return;
	}

	transport->tcp_copied += r;
	transport->tcp_offset += r;
	desc->count = len - r;

	dprintk("RPC:       XID %08x read %zd bytes\n",
			ntohl(transport->tcp_xid), r);
	dprintk("RPC:       xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
			"tcp_reclen = %u\n", xprt, transport->tcp_copied,
			transport->tcp_offset, transport->tcp_reclen);

	if (transport->tcp_copied == req->rq_private_buf.buflen)
		transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
	else if (transport->tcp_offset == transport->tcp_reclen) {
		if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
			transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 222 72.31% 6 54.55%
Ricardo Labiaga 50 16.29% 2 18.18%
Trond Myklebust 34 11.07% 2 18.18%
Alexey Dobriyan 1 0.33% 1 9.09%
Total 307 100.00% 11 100.00%

/*
 * Finds the request corresponding to the RPC xid and invokes the common
 * tcp read code to read the data.
 */


static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
				    struct xdr_skb_reader *desc)
{
	struct sock_xprt *transport =
				container_of(xprt, struct sock_xprt, xprt);
	struct rpc_rqst *req;

	dprintk("RPC:       read reply XID %08x\n", ntohl(transport->tcp_xid));

	/* Find and lock the request corresponding to this xid */
	spin_lock(&xprt->recv_lock);
	req = xprt_lookup_rqst(xprt, transport->tcp_xid);
	if (!req) {
		dprintk("RPC:       XID %08x request not found!\n",
				ntohl(transport->tcp_xid));
		spin_unlock(&xprt->recv_lock);
		return -1;
	}
	xprt_pin_rqst(req);
	spin_unlock(&xprt->recv_lock);

	xs_tcp_read_common(xprt, desc, req);

	spin_lock(&xprt->recv_lock);
	if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
		xprt_complete_rqst(req->rq_task, transport->tcp_copied);
	xprt_unpin_rqst(req);
	spin_unlock(&xprt->recv_lock);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Ricardo Labiaga 108 64.29% 1 14.29%
Trond Myklebust 32 19.05% 2 28.57%
Chuck Lever 28 16.67% 4 57.14%
Total 168 100.00% 7 100.00%

#if defined(CONFIG_SUNRPC_BACKCHANNEL)
/*
 * Obtains an rpc_rqst previously allocated and invokes the common
 * tcp read code to read the data.  The result is placed in the callback
 * queue.
 * If we're unable to obtain the rpc_rqst we schedule the closing of the
 * connection and return -1.
 */


static int xs_tcp_read_callback(struct rpc_xprt *xprt,
				       struct xdr_skb_reader *desc)
{
	struct sock_xprt *transport =
				container_of(xprt, struct sock_xprt, xprt);
	struct rpc_rqst *req;

	/* Look up the request corresponding to the given XID */
	req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
	if (req == NULL) {
		printk(KERN_WARNING "Callback slot table overflowed\n");
		xprt_force_disconnect(xprt);
		return -1;
	}

	dprintk("RPC:       read callback  XID %08x\n", ntohl(req->rq_xid));
	xs_tcp_read_common(xprt, desc, req);

	if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
		xprt_complete_bc_request(req, transport->tcp_copied);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Ricardo Labiaga 103 89.57% 1 25.00%
Trond Myklebust 9 7.83% 2 50.00%
Chuck Lever 3 2.61% 1 25.00%
Total 115 100.00% 4 100.00%



static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
					struct xdr_skb_reader *desc)
{
	struct sock_xprt *transport =
				container_of(xprt, struct sock_xprt, xprt);

	return (transport->tcp_flags & TCP_RPC_REPLY) ?
		xs_tcp_read_reply(xprt, desc) :
		xs_tcp_read_callback(xprt, desc);
}

Contributors
Person Tokens Prop Commits CommitProp
Ricardo Labiaga 46 83.64% 1 33.33%
Chuck Lever 9 16.36% 2 66.67%
Total 55 100.00% 3 100.00%



static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net)
{
	int ret;

	ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
			      SVC_SOCK_ANONYMOUS);
	if (ret < 0)
		return ret;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 48 100.00% 1 100.00%
Total 48 100.00% 1 100.00%



static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
{
	return PAGE_SIZE;
}
Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 14 100.00% 1 100.00%
Total 14 100.00% 1 100.00%

#else


static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
					struct xdr_skb_reader *desc)
{
	return xs_tcp_read_reply(xprt, desc);
}
Contributors
Person Tokens Prop Commits CommitProp
Ricardo Labiaga 24 96.00% 1 50.00%
Chuck Lever 1 4.00% 1 50.00%
Total 25 100.00% 2 100.00%

#endif /* CONFIG_SUNRPC_BACKCHANNEL */

/*
 * Read data off the transport.  This can be either an RPC_CALL or an
 * RPC_REPLY.  Relay the processing to helper functions.
 */


static void xs_tcp_read_data(struct rpc_xprt *xprt,
				    struct xdr_skb_reader *desc)
{
	struct sock_xprt *transport =
				container_of(xprt, struct sock_xprt, xprt);

	if (_xs_tcp_read_data(xprt, desc) == 0)
		xs_tcp_check_fraghdr(transport);
	else {
		/*
                 * The transport_lock protects the request handling.
                 * There's no need to hold it to update the tcp_flags.
                 */
		transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Ricardo Labiaga 47 81.03% 1 33.33%
Chuck Lever 11 18.97% 2 66.67%
Total 58 100.00% 3 100.00%



static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
{
	size_t len;

	len = transport->tcp_reclen - transport->tcp_offset;
	if (len > desc->count)
		len = desc->count;
	desc->count -= len;
	desc->offset += len;
	transport->tcp_offset += len;
	dprintk("RPC:       discarded %zu bytes\n", len);
	xs_tcp_check_fraghdr(transport);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 73 98.65% 4 80.00%
Alexey Dobriyan 1 1.35% 1 20.00%
Total 74 100.00% 5 100.00%



static int xs_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;
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
	struct xdr_skb_reader desc = {
		.skb	= skb,
		.offset	= offset,
		.count	= len,
        };

	dprintk("RPC:       xs_tcp_data_recv started\n");
	do {
		trace_xs_tcp_data_recv(transport);
		/* Read in a new fragment marker if necessary */
		/* Can we ever really expect to get completely empty fragments? */
		if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
			xs_tcp_read_fraghdr(xprt, &desc);
			continue;
		}
		/* Read in the xid if necessary */
		if (transport->tcp_flags & TCP_RCV_COPY_XID) {
			xs_tcp_read_xid(transport, &desc);
			continue;
		}
		/* Read in the call/reply flag */
		if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
			xs_tcp_read_calldir(transport, &desc);
			continue;
		}
		/* Read in the request data */
		if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
			xs_tcp_read_data(xprt, &desc);
			continue;
		}
		/* Skip over any trailing bytes on short reads */
		xs_tcp_read_discard(transport, &desc);
	} while (desc.count);
	trace_xs_tcp_data_recv(transport);
	dprintk("RPC:       xs_tcp_data_recv done\n");
	return len - desc.count;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 165 84.18% 6 60.00%
Ricardo Labiaga 21 10.71% 3 30.00%
Jeff Layton 10 5.10% 1 10.00%
Total 196 100.00% 10 100.00%



static void xs_tcp_data_receive(struct sock_xprt *transport)
{
	struct rpc_xprt *xprt = &transport->xprt;
	struct sock *sk;
	read_descriptor_t rd_desc = {
		.count = 2*1024*1024,
		.arg.data = xprt,
        };
	unsigned long total = 0;
	int loop;
	int read = 0;

	mutex_lock(&transport->recv_mutex);
	sk = transport->inet;
	if (sk == NULL)
		goto out;

	/* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
	for (loop = 0; loop < 64; loop++) {
		lock_sock(sk);
		read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
		if (read <= 0) {
			clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
			release_sock(sk);
			break;
		}
		release_sock(sk);
		total += read;
		rd_desc.count = 65536;
	}
	if (test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
		queue_work(xprtiod_workqueue, &transport->recv_worker);
out:
	mutex_unlock(&transport->recv_mutex);
	trace_xs_tcp_data_ready(xprt, read, total);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 177 89.85% 5 71.43%
Chuck Lever 14 7.11% 1 14.29%
Jeff Layton 6 3.05% 1 14.29%
Total 197 100.00% 7 100.00%



static void xs_tcp_data_receive_workfn(struct work_struct *work)
{
	struct sock_xprt *transport =
		container_of(work, struct sock_xprt, recv_worker);
	xs_tcp_data_receive(transport);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 31 100.00% 1 100.00%
Total 31 100.00% 1 100.00%

/**
 * xs_tcp_state_change - callback to handle TCP socket state changes
 * @sk: socket whose state has changed
 *
 */


static void xs_tcp_state_change(struct sock *sk)
{
	struct rpc_xprt *xprt;
	struct sock_xprt *transport;

	read_lock_bh(&sk->sk_callback_lock);
	if (!(xprt = xprt_from_sock(sk)))
		goto out;
	dprintk("RPC:       xs_tcp_state_change client %p...\n", xprt);
	dprintk("RPC:       state %x conn %d dead %d zapped %d sk_shutdown %d\n",
			sk->sk_state, xprt_connected(xprt),
			sock_flag(sk, SOCK_DEAD),
			sock_flag(sk, SOCK_ZAPPED),
			sk->sk_shutdown);

	transport = container_of(xprt, struct sock_xprt, xprt);
	trace_rpc_socket_state_change(xprt, sk->sk_socket);
	switch (sk->sk_state) {
	case TCP_ESTABLISHED:
		spin_lock(&xprt->transport_lock);
		if (!xprt_test_and_set_connected(xprt)) {

			/* Reset TCP record info */
			transport->tcp_offset = 0;
			transport->tcp_reclen = 0;
			transport->tcp_copied = 0;
			transport->tcp_flags =
				TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
			xprt->connect_cookie++;
			clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
			xprt_clear_connecting(xprt);

			xprt_wake_pending_tasks(xprt, -EAGAIN);
		}
		spin_unlock(&xprt->transport_lock);
		break;
	case TCP_FIN_WAIT1:
		/* The client initiated a shutdown of the socket */
		xprt->connect_cookie++;
		xprt->reestablish_timeout = 0;
		set_bit(XPRT_CLOSING, &xprt->state);
		smp_mb__before_atomic();
		clear_bit(XPRT_CONNECTED, &xprt->state);
		clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
		smp_mb__after_atomic();
		break;
	case TCP_CLOSE_WAIT:
		/* The server initiated a shutdown of the socket */
		xprt->connect_cookie++;
		clear_bit(XPRT_CONNECTED, &xprt->state);
		xs_tcp_force_close(xprt);
		/* fall through */
	case TCP_CLOSING:
		/*
                 * If the server closed down the connection, make sure that
                 * we back off before reconnecting
                 */
		if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
			xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
		break;
	case TCP_LAST_ACK:
		set_bit(XPRT_CLOSING, &xprt->state);
		smp_mb__before_atomic();
		clear_bit(XPRT_CONNECTED, &xprt->state);
		smp_mb__after_atomic();
		break;
	case TCP_CLOSE:
		if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
					&transport->sock_state))
			xprt_clear_connecting(xprt);
		if (sk->sk_err)
			xprt_wake_pending_tasks(xprt, -sk->sk_err);
		xs_sock_mark_closed(xprt);
	}
 out:
	read_unlock_bh(&sk->sk_callback_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 187 50.00% 13 52.00%
Chuck Lever 157 41.98% 7 28.00%
Neil Brown 16 4.28% 1 4.00%
Andy Chittenden 5 1.34% 1 4.00%
Eric Dumazet 4 1.07% 1 4.00%
Peter Zijlstra 4 1.07% 1 4.00%
Gustavo A. R. Silva 1 0.27% 1 4.00%
Total 374 100.00% 25 100.00%



static void xs_write_space(struct sock *sk)
{
	struct socket_wq *wq;
	struct rpc_xprt *xprt;

	if (!sk->sk_socket)
		return;
	clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);

	if (unlikely(!(xprt = xprt_from_sock(sk))))
		return;
	rcu_read_lock();
	wq = rcu_dereference(sk->sk_wq);
	if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
		goto out;

	xprt_write_space(xprt);
out:
	rcu_read_unlock();
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 55 55.56% 2 33.33%
Trond Myklebust 40 40.40% 2 33.33%
Ilpo Järvinen 3 3.03% 1 16.67%
Eric Dumazet 1 1.01% 1 16.67%
Total 99 100.00% 6 100.00%

/**
 * xs_udp_write_space - callback invoked when socket buffer space
 *                             becomes available
 * @sk: socket whose state has changed
 *
 * 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 kernel_sendmsg
 * with a bunch of small requests.
 */


static void xs_udp_write_space(struct sock *sk)
{
	read_lock_bh(&sk->sk_callback_lock);

	/* from net/core/sock.c:sock_def_write_space */
	if (sock_writeable(sk))
		xs_write_space(sk);

	read_unlock_bh(&sk->sk_callback_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Ilpo Järvinen 30 75.00% 1 33.33%
Chuck Lever 8 20.00% 1 33.33%
Eric Dumazet 2 5.00% 1 33.33%
Total 40 100.00% 3 100.00%

/**
 * xs_tcp_write_space - callback invoked when socket buffer space
 *                             becomes available
 * @sk: socket whose state has changed
 *
 * 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 kernel_sendmsg
 * with a bunch of small requests.
 */


static void xs_tcp_write_space(struct sock *sk)
{
	read_lock_bh(&sk->sk_callback_lock);

	/* from net/core/stream.c:sk_stream_write_space */
	if (sk_stream_is_writeable(sk))
		xs_write_space(sk);

	read_unlock_bh(&sk->sk_callback_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 36 90.00% 2 40.00%
Eric Dumazet 3 7.50% 2 40.00%
Ilpo Järvinen 1 2.50% 1 20.00%
Total 40 100.00% 5 100.00%



static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
	struct sock *sk = transport->inet;

	if (transport->rcvsize) {
		sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
		sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
	}
	if (transport->sndsize) {
		sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
		sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
		sk->sk_write_space(sk);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 98 100.00% 6 100.00%
Total 98 100.00% 6 100.00%

/**
 * xs_udp_set_buffer_size - set send and receive limits
 * @xprt: generic transport
 * @sndsize: requested size of send buffer, in bytes
 * @rcvsize: requested size of receive buffer, in bytes
 *
 * Set socket send and receive buffer size limits.
 */


static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);

	transport->sndsize = 0;
	if (sndsize)
		transport->sndsize = sndsize + 1024;
	transport->rcvsize = 0;
	if (rcvsize)
		transport->rcvsize = rcvsize + 1024;

	xs_udp_do_set_buffer_size(xprt);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 61 83.56% 4 80.00%
Trond Myklebust 12 16.44% 1 20.00%
Total 73 100.00% 5 100.00%

/**
 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
 * @task: task that timed out
 *
 * Adjust the congestion window after a retransmit timeout has occurred.
 */


static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
{
	spin_lock_bh(&xprt->transport_lock);
	xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
	spin_unlock_bh(&xprt->transport_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 35 83.33% 3 75.00%
Trond Myklebust 7 16.67% 1 25.00%
Total 42 100.00% 4 100.00%



static unsigned short xs_get_random_port(void)
{
	unsigned short range = xprt_max_resvport - xprt_min_resvport + 1;
	unsigned short rand = (unsigned short) prandom_u32() % range;
	return rand + xprt_min_resvport;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 34 91.89% 2 50.00%
Frank Sorenson 2 5.41% 1 25.00%
Aruna-Hewapathirane 1 2.70% 1 25.00%
Total 37 100.00% 4 100.00%

/**
 * xs_set_reuseaddr_port - set the socket's port and address reuse options
 * @sock: socket
 *
 * Note that this function has to be called on all sockets that share the
 * same port, and it must be called before binding.
 */


static void xs_sock_set_reuseport(struct socket *sock)
{
	int opt = 1;

	kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
			(char *)&opt, sizeof(opt));
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 37 100.00% 2 100.00%
Total 37 100.00% 2 100.00%



static unsigned short xs_sock_getport(struct socket *sock)
{
	struct sockaddr_storage buf;
	int buflen;
	unsigned short port = 0;

	if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0)
		goto out;
	switch (buf.ss_family) {
	case AF_INET6:
		port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
		break;
	case AF_INET:
		port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
	}
out:
	return port;
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 102 100.00% 1 100.00%
Total 102 100.00% 1 100.00%

/**
 * xs_set_port - reset the port number in the remote endpoint address
 * @xprt: generic transport
 * @port: new port number
 *
 */


static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
{
	dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);

	rpc_set_port(xs_addr(xprt), port);
	xs_update_peer_port(xprt);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 39 100.00% 6 100.00%
Total 39 100.00% 6 100.00%



static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
{
	if (transport->srcport == 0)
		transport->srcport = xs_sock_getport(sock);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 33 100.00% 1 100.00%
Total 33 100.00% 1 100.00%



static unsigned short xs_get_srcport(struct sock_xprt *transport)
{
	unsigned short port = transport->srcport;

	if (port == 0 && transport->xprt.resvport)
		port = xs_get_random_port();
	return port;
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 39 97.50% 1 50.00%
Chuck Lever 1 2.50% 1 50.00%
Total 40 100.00% 2 100.00%



static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
{
	if (transport->srcport != 0)
		transport->srcport = 0;
	if (!transport->xprt.resvport)
		return 0;
	if (port <= xprt_min_resvport || port > xprt_max_resvport)
		return xprt_max_resvport;
	return --port;
}
Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 57 96.61% 1 50.00%
Chuck Lever 2 3.39% 1 50.00%
Total 59 100.00% 2 100.00%



static int xs_bind(struct sock_xprt *transport, struct socket *sock)
{
	struct sockaddr_storage myaddr;
	int err, nloop = 0;
	unsigned short port = xs_get_srcport(transport);
	unsigned short last;

	/*
         * If we are asking for any ephemeral port (i.e. port == 0 &&
         * transport->xprt.resvport == 0), don't bind.  Let the local
         * port selection happen implicitly when the socket is used
         * (for example at connect time).
         *
         * This ensures that we can continue to establish TCP
         * connections even when all local ephemeral ports are already
         * a part of some TCP connection.  This makes no difference
         * for UDP sockets, but also doens't harm them.
         *
         * If we're asking for any reserved port (i.e. port == 0 &&
         * transport->xprt.resvport == 1) xs_get_srcport above will
         * ensure that port is non-zero and we will bind as needed.
         */
	if (port == 0)
		return 0;

	memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
	do {
		rpc_set_port((struct sockaddr *)&myaddr, port);
		err = kernel_bind(sock, (struct sockaddr *)&myaddr,
				transport->xprt.addrlen);
		if (err == 0) {
			transport->srcport = port;
			break;
		}
		last = port;
		port = xs_next_srcport(transport, port);
		if (port > last)
			nloop++;
	} while (err == -EADDRINUSE && nloop != 2);

	if (myaddr.ss_family == AF_INET)
		dprintk("RPC:       %s %pI4:%u: %s (%d)\n", __func__,
				&((struct sockaddr_in *)&myaddr)->sin_addr,
				port, err ? "failed" : "ok", err);
	else
		dprintk("RPC:       %s %pI6:%u: %s (%d)\n", __func__,
				&((struct sockaddr_in6 *)&myaddr)->sin6_addr,
				port, err ? "failed" : "ok", err);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 113 50.22% 10 58.82%
Pavel Emelyanov 51 22.67% 1 5.88%
Trond Myklebust 30 13.33% 1 5.88%
Frank van Maarseveen 17 7.56% 1 5.88%
Chris Perl 10 4.44% 1 5.88%
Harvey Harrison 3 1.33% 2 11.76%
Sridhar Samudrala 1 0.44% 1 5.88%
Total 225 100.00% 17 100.00%

/*
 * We don't support autobind on AF_LOCAL sockets
 */


static void xs_local_rpcbind(struct rpc_task *task)
{
	xprt_set_bound(task->tk_xprt);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 15 83.33% 1 33.33%
Trond Myklebust 3 16.67% 2 66.67%
Total 18 100.00% 3 100.00%



static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
{
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 14 100.00% 1 100.00%
Total 14 100.00% 1 100.00%

#ifdef CONFIG_DEBUG_LOCK_ALLOC

static struct lock_class_key xs_key[2];

static struct lock_class_key xs_slock_key[2];



static inline void xs_reclassify_socketu(struct socket *sock)
{
	struct sock *sk = sock->sk;

	sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
		&xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 41 97.62% 1 50.00%
Peter Zijlstra 1 2.38% 1 50.00%
Total 42 100.00% 2 100.00%



static inline void xs_reclassify_socket4(struct socket *sock)
{
	struct sock *sk = sock->sk;

	sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
		&xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 25 59.52% 7 70.00%
Peter Zijlstra 15 35.71% 1 10.00%
Trond Myklebust 1 2.38% 1 10.00%
Harvey Harrison 1 2.38% 1 10.00%
Total 42 100.00% 10 100.00%



static inline void xs_reclassify_socket6(struct socket *sock)
{
	struct sock *sk = sock->sk;

	sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
		&xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
}

Contributors
Person Tokens Prop Commits CommitProp
Peter Zijlstra 28 66.67% 1 25.00%
Chuck Lever 14 33.33% 3 75.00%
Total 42 100.00% 4 100.00%



static inline void xs_reclassify_socket(int family, struct socket *sock)
{
	if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
		return;

	switch (family) {
	case AF_LOCAL:
		xs_reclassify_socketu(sock);
		break;
	case AF_INET:
		xs_reclassify_socket4(sock);
		break;
	case AF_INET6:
		xs_reclassify_socket6(sock);
		break;
	}
}
Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 48 77.42% 1 33.33%
Weston Andros Adamson 10 16.13% 1 33.33%
Hannes Frederic Sowa 4 6.45% 1 33.33%
Total 62 100.00% 3 100.00%

#else


static inline void xs_reclassify_socket(int family, struct socket *sock)
{
}
Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 14 100.00% 1 100.00%
Total 14 100.00% 1 100.00%

#endif



static void xs_dummy_setup_socket(struct work_struct *work)
{
}

Contributors
Person Tokens Prop Commits CommitProp
Neil Brown 10 100.00% 1 100.00%
Total 10 100.00% 1 100.00%



static struct socket *xs_create_sock(struct rpc_xprt *xprt,
		struct sock_xprt *transport, int family, int type,
		int protocol, bool reuseport)
{
	struct socket *sock;
	int err;

	err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
	if (err < 0) {
		dprintk("RPC:       can't create %d transport socket (%d).\n",
				protocol, -err);
		goto out;
	}
	xs_reclassify_socket(family, sock);

	if (reuseport)
		xs_sock_set_reuseport(sock);

	err = xs_bind(transport, sock);
	if (err) {
		sock_release(sock);
		goto out;
	}

	return sock;
out:
	return ERR_PTR(err);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 117 90.70% 2 66.67%
Trond Myklebust 12 9.30% 1 33.33%
Total 129 100.00% 3 100.00%



static int xs_local_finish_connecting(struct rpc_xprt *xprt,
				      struct socket *sock)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
									xprt);

	if (!transport->inet) {
		struct sock *sk = sock->sk;

		write_lock_bh(&sk->sk_callback_lock);

		xs_save_old_callbacks(transport, sk);

		sk->sk_user_data = xprt;
		sk->sk_data_ready = xs_data_ready;
		sk->sk_write_space = xs_udp_write_space;
		sock_set_flag(sk, SOCK_FASYNC);
		sk->sk_error_report = xs_error_report;
		sk->sk_allocation = GFP_NOIO;

		xprt_clear_connected(xprt);

		/* Reset to new socket */
		transport->sock = sock;
		transport->inet = sk;

		write_unlock_bh(&sk->sk_callback_lock);
	}

	/* Tell the socket layer to start connecting... */
	xprt->stat.connect_count++;
	xprt->stat.connect_start = jiffies;
	return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 139 86.88% 4 44.44%
Trond Myklebust 8 5.00% 3 33.33%
Eric Dumazet 7 4.38% 1 11.11%
Pavel Emelyanov 6 3.75% 1 11.11%
Total 160 100.00% 9 100.00%

/**
 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
 * @transport: socket transport to connect
 */


static int xs_local_setup_socket(struct sock_xprt *transport)
{
	struct rpc_xprt *xprt = &transport->xprt;
	struct socket *sock;
	int status = -EIO;

	status = __sock_create(xprt->xprt_net, AF_LOCAL,
					SOCK_STREAM, 0, &sock, 1);
	if (status < 0) {
		dprintk("RPC:       can't create AF_LOCAL "
			"transport socket (%d).\n", -status);
		goto out;
	}
	xs_reclassify_socket(AF_LOCAL, sock);

	dprintk("RPC:       worker connecting xprt %p via AF_LOCAL to %s\n",
			xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);

	status = xs_local_finish_connecting(xprt, sock);
	trace_rpc_socket_connect(xprt, sock, status);
	switch (status) {
	case 0:
		dprintk("RPC:       xprt %p connected to %s\n",
				xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
		xprt_set_connected(xprt);
	case -ENOBUFS:
		break;
	case -ENOENT:
		dprintk("RPC:       xprt %p: socket %s does not exist\n",
				xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
		break;
	case -ECONNREFUSED:
		dprintk("RPC:       xprt %p: connection refused for %s\n",
				xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
		break;
	default:
		printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
				__func__, -status,
				xprt->address_strings[RPC_DISPLAY_ADDR]);
	}

out:
	xprt_clear_connecting(xprt);
	xprt_wake_pending_tasks(xprt, status);
	return status;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 123 56.42% 3 27.27%
Pavel Emelyanov 50 22.94% 2 18.18%
Trond Myklebust 32 14.68% 3 27.27%
J. Bruce Fields 7 3.21% 1 9.09%
Ben Hutchings 3 1.38% 1 9.09%
Stefan Hajnoczi 3 1.38% 1 9.09%
Total 218 100.00% 11 100.00%



static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
	int ret;

	 if (RPC_IS_ASYNC(task)) {
		/*
                 * We want the AF_LOCAL connect to be resolved in the
                 * filesystem namespace of the process making the rpc
                 * call.  Thus we connect synchronously.
                 *
                 * If we want to support asynchronous AF_LOCAL calls,
                 * we'll need to figure out how to pass a namespace to
                 * connect.
                 */
		rpc_exit(task, -ENOTCONN);
		return;
	}
	ret = xs_local_setup_socket(transport);
	if (ret && !RPC_IS_SOFTCONN(task))
		msleep_interruptible(15000);
}

Contributors
Person Tokens Prop Commits CommitProp
J. Bruce Fields 69 92.00% 1 33.33%
Linus Torvalds 5 6.67% 1 33.33%
Pavel Emelyanov 1 1.33% 1 33.33%
Total 75 100.00% 3 100.00%

#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
/*
 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
 * know that we have exclusive access to the socket), to guard against
 * races with xs_reset_transport.
 */


static void xs_set_memalloc(struct rpc_xprt *xprt)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
			xprt);

	/*
         * If there's no sock, then we have nothing to set. The
         * reconnecting process will get it for us.
         */
	if (!transport->inet)
		return;
	if (atomic_read(&xprt->swapper))
		sk_set_memalloc(transport->inet);
}

Contributors
Person Tokens Prop Commits CommitProp
Mel Gorman 39 75.00% 1 33.33%
Jeff Layton 13 25.00% 2 66.67%
Total 52 100.00% 3 100.00%

/**
 * xs_enable_swap - Tag this transport as being used for swap.
 * @xprt: transport to tag
 *
 * Take a reference to this transport on behalf of the rpc_clnt, and
 * optionally mark it for swapping if it wasn't already.
 */

static int

xs_enable_swap(struct rpc_xprt *xprt)
{
	struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);

	if (atomic_inc_return(&xprt->swapper) != 1)
		return 0;
	if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
		return -ERESTARTSYS;
	if (xs->inet)
		sk_set_memalloc(xs->inet);
	xprt_release_xprt(xprt, NULL);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Layton 47 57.32% 3 75.00%
Mel Gorman 35 42.68% 1 25.00%
Total 82 100.00% 4 100.00%

/**
 * xs_disable_swap - Untag this transport as being used for swap.
 * @xprt: transport to tag
 *
 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
 * swapper refcount goes to 0, untag the socket as a memalloc socket.
 */

static void

xs_disable_swap(struct rpc_xprt *xprt)
{
	struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);

	if (!atomic_dec_and_test(&xprt->swapper))
		return;
	if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
		return;
	if (xs->inet)
		sk_clear_memalloc(xs->inet);
	xprt_release_xprt(xprt, NULL);
}
Contributors
Person Tokens Prop Commits CommitProp
Jeff Layton 55 75.34% 3 75.00%
Mel Gorman 18 24.66% 1 25.00%
Total 73 100.00% 4 100.00%

#else


static void xs_set_memalloc(struct rpc_xprt *xprt)
{
}

Contributors
Person Tokens Prop Commits CommitProp
Mel Gorman 10 100.00% 1 100.00%
Total 10 100.00% 1 100.00%


static int

xs_enable_swap(struct rpc_xprt *xprt)
{
	return -EINVAL;
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Layton 15 100.00% 1 100.00%
Total 15 100.00% 1 100.00%


static void

xs_disable_swap(struct rpc_xprt *xprt)
{
}
Contributors
Person Tokens Prop Commits CommitProp
Jeff Layton 10 100.00% 1 100.00%
Total 10 100.00% 1 100.00%

#endif



static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);

	if (!transport->inet) {
		struct sock *sk = sock->sk;

		write_lock_bh(&sk->sk_callback_lock);

		xs_save_old_callbacks(transport, sk);

		sk->sk_user_data = xprt;
		sk->sk_data_ready = xs_data_ready;
		sk->sk_write_space = xs_udp_write_space;
		sock_set_flag(sk, SOCK_FASYNC);
		sk->sk_allocation = GFP_NOIO;

		xprt_set_connected(xprt);

		/* Reset to new socket */
		transport->sock = sock;
		transport->inet = sk;

		xs_set_memalloc(xprt);

		write_unlock_bh(&sk->sk_callback_lock);
	}
	xs_udp_do_set_buffer_size(xprt);

	xprt->stat.connect_start = jiffies;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 102 73.38% 4 36.36%
Trond Myklebust 16 11.51% 4 36.36%
Frank van Maarseveen 9 6.47% 1 9.09%
Eric Dumazet 7 5.04% 1 9.09%
Mel Gorman 5 3.60% 1 9.09%
Total 139 100.00% 11 100.00%



static void xs_udp_setup_socket(struct work_struct *work)
{
	struct sock_xprt *transport =
		container_of(work, struct sock_xprt, connect_worker.work);
	struct rpc_xprt *xprt = &transport->xprt;
	struct socket *sock;
	int status = -EIO;

	sock = xs_create_sock(xprt, transport,
			xs_addr(xprt)->sa_family, SOCK_DGRAM,
			IPPROTO_UDP, false);
	if (IS_ERR(sock))
		goto out;

	dprintk("RPC:       worker connecting xprt %p via %s to "
				"%s (port %s)\n", xprt,
			xprt->address_strings[RPC_DISPLAY_PROTO],
			xprt->address_strings[RPC_DISPLAY_ADDR],
			xprt->address_strings[RPC_DISPLAY_PORT]);

	xs_udp_finish_connecting(xprt, sock);
	trace_rpc_socket_connect(xprt, sock, 0);
	status = 0;
out:
	xprt_unlock_connect(xprt, transport);
	xprt_clear_connecting(xprt);
	xprt_wake_pending_tasks(xprt, status);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 78 51.66% 9 45.00%
Peter Zijlstra 26 17.22% 1 5.00%
Trond Myklebust 22 14.57% 4 20.00%
Pavel Emelyanov 14 9.27% 5 25.00%
David Howells 11 7.28% 1 5.00%
Total 151 100.00% 20 100.00%

/**
 * xs_tcp_shutdown - gracefully shut down a TCP socket
 * @xprt: transport
 *
 * Initiates a graceful shutdown of the TCP socket by calling the
 * equivalent of shutdown(SHUT_RDWR);
 */


static void xs_tcp_shutdown(struct rpc_xprt *xprt)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
	struct socket *sock = transport->sock;

	if (sock == NULL)
		return;
	if (xprt_connected(xprt)) {
		kernel_sock_shutdown(sock, SHUT_RDWR);
		trace_rpc_socket_shutdown(xprt, sock);
	} else
		xs_reset_transport(transport);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 71 100.00% 1 100.00%
Total 71 100.00% 1 100.00%



static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
		struct socket *sock)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
	unsigned int keepidle;
	unsigned int keepcnt;
	unsigned int opt_on = 1;
	unsigned int timeo;

	spin_lock_bh(&xprt->transport_lock);
	keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
	keepcnt = xprt->timeout->to_retries + 1;
	timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
		(xprt->timeout->to_retries + 1);
	clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
	spin_unlock_bh(&xprt->transport_lock);

	/* TCP Keepalive options */
	kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
			(char *)&opt_on, sizeof(opt_on));
	kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
			(char *)&keepidle, sizeof(keepidle));
	kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
			(char *)&keepidle, sizeof(keepidle));
	kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
			(char *)&keepcnt, sizeof(keepcnt));

	/* TCP user timeout (see RFC5482) */
	kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
			(char *)&timeo, sizeof(timeo));
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 179 79.20% 5 45.45%
Chuck Lever 27 11.95% 4 36.36%
Neil Brown 17 7.52% 1 9.09%
David Howells 3 1.33% 1 9.09%
Total 226 100.00% 11 100.00%



static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
		unsigned long connect_timeout,
		unsigned long reconnect_timeout)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
	struct rpc_timeout to;
	unsigned long initval;

	spin_lock_bh(&xprt->transport_lock);
	if (reconnect_timeout < xprt->max_reconnect_timeout)
		xprt->max_reconnect_timeout = reconnect_timeout;
	if (connect_timeout < xprt->connect_timeout) {
		memcpy(&to, xprt->timeout, sizeof(to));
		initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
		/* Arbitrary lower limit */
		if (initval <  XS_TCP_INIT_REEST_TO << 1)
			initval = XS_TCP_INIT_REEST_TO << 1;
		to.to_initval = initval;
		to.to_maxval = initval;
		memcpy(&transport->tcp_timeout, &to,
				sizeof(transport->tcp_timeout));
		xprt->timeout = &transport->tcp_timeout;
		xprt->connect_timeout = connect_timeout;
	}
	set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
	spin_unlock_bh(&xprt->transport_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 180 100.00% 2 100.00%
Total 180 100.00% 2 100.00%



static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
	int ret = -ENOTCONN;

	if (!transport->inet) {
		struct sock *sk = sock->sk;
		unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC;

		/* Avoid temporary address, they are bad for long-lived
                 * connections such as NFS mounts.
                 * RFC4941, section 3.6 suggests that:
                 *    Individual applications, which have specific
                 *    knowledge about the normal duration of connections,
                 *    MAY override this as appropriate.
                 */
		kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES,
				(char *)&addr_pref, sizeof(addr_pref));

		xs_tcp_set_socket_timeouts(xprt, sock);

		write_lock_bh(&sk->sk_callback_lock);

		xs_save_old_callbacks(transport, sk);

		sk->sk_user_data = xprt;
		sk->sk_data_ready = xs_data_ready;
		sk->sk_state_change = xs_tcp_state_change;
		sk->sk_write_space = xs_tcp_write_space;
		sock_set_flag(sk, SOCK_FASYNC);
		sk->sk_error_report = xs_error_report;
		sk->sk_allocation = GFP_NOIO;

		/* socket options */
		sock_reset_flag(sk, SOCK_LINGER);
		tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;

		xprt_clear_connected(xprt);

		/* Reset to new socket */
		transport->sock = sock;
		transport->inet = sk;

		write_unlock_bh(&sk->sk_callback_lock);
	}

	if (!xprt_bound(xprt))
		goto out;

	xs_set_memalloc(xprt);

	/* Tell the socket layer to start connecting... */
	xprt->stat.connect_count++;
	xprt->stat.connect_start = jiffies;
	set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
	ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
	switch (ret) {
	case 0:
		xs_set_srcport(transport, sock);
		/* fall through */
	case -EINPROGRESS:
		/* SYN_SENT! */
		if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
			xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
		break;
	case -EADDRNOTAVAIL:
		/* Source port number is unavailable. Try a new one! */
		transport->srcport = 0;
	}
out:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 182 59.87% 12 46.15%
Chuck Lever 108 35.53% 10 38.46%
Eric Dumazet 7 2.30% 1 3.85%
Mel Gorman 5 1.64% 1 3.85%
Gustavo A. R. Silva 1 0.33% 1 3.85%
Sridhar Samudrala 1 0.33% 1 3.85%
Total 304 100.00% 26 100.00%

/**
 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
 *
 * Invoked by a work queue tasklet.
 */


static void xs_tcp_setup_socket(struct work_struct *work)
{
	struct sock_xprt *transport =
		container_of(work, struct sock_xprt, connect_worker.work);
	struct socket *sock = transport->sock;
	struct rpc_xprt *xprt = &transport->xprt;
	int status = -EIO;

	if (!sock) {
		sock = xs_create_sock(xprt, transport,
				xs_addr(xprt)->sa_family, SOCK_STREAM,
				IPPROTO_TCP, true);
		if (IS_ERR(sock)) {
			status = PTR_ERR(sock);
			goto out;
		}
	}

	dprintk("RPC:       worker connecting xprt %p via %s to "
				"%s (port %s)\n", xprt,
			xprt->address_strings[RPC_DISPLAY_PROTO],
			xprt->address_strings[RPC_DISPLAY_ADDR],
			xprt->address_strings[RPC_DISPLAY_PORT]);

	status = xs_tcp_finish_connecting(xprt, sock);
	trace_rpc_socket_connect(xprt, sock, status);
	dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
			xprt, -status, xprt_connected(xprt),
			sock->sk->sk_state);
	switch (status) {
	default:
		printk("%s: connect returned unhandled error %d\n",
			__func__, status);
		/* fall through */
	case -EADDRNOTAVAIL:
		/* We're probably in TIME_WAIT. Get rid of existing socket,
                 * and retry
                 */
		xs_tcp_force_close(xprt);
		break;
	case 0:
	case -EINPROGRESS:
	case -EALREADY:
		xprt_unlock_connect(xprt, transport);
		return;
	case -EINVAL:
		/* Happens, for instance, if the user specified a link
                 * local IPv6 address without a scope-id.
                 */
	case -ECONNREFUSED:
	case -ECONNRESET:
	case -ENETDOWN:
	case -ENETUNREACH:
	case -EHOSTUNREACH:
	case -EADDRINUSE:
	case -ENOBUFS:
		/*
                 * xs_tcp_force_close() wakes tasks with -EIO.
                 * We need to wake them first to ensure the
                 * correct error code.
                 */
		xprt_wake_pending_tasks(xprt, status);
		xs_tcp_force_close(xprt);
		goto out;
	}
	status = -EAGAIN;
out:
	xprt_unlock_connect(xprt, transport);
	xprt_clear_connecting(xprt);
	xprt_wake_pending_tasks(xprt, status);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 130 44.67% 9 26.47%
Trond Myklebust 110 37.80% 17 50.00%
Pavel Emelyanov 37 12.71% 4 11.76%
Neil Brown 8 2.75% 1 2.94%
Peter Zijlstra 3 1.03% 1 2.94%
David Howells 2 0.69% 1 2.94%
Gustavo A. R. Silva 1 0.34% 1 2.94%
Total 291 100.00% 34 100.00%



static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt)
{
	unsigned long start, now = jiffies;

	start = xprt->stat.connect_start + xprt->reestablish_timeout;
	if (time_after(start, now))
		return start - now;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 50 100.00% 1 100.00%
Total 50 100.00% 1 100.00%



static void xs_reconnect_backoff(struct rpc_xprt *xprt)
{
	xprt->reestablish_timeout <<= 1;
	if (xprt->reestablish_timeout > xprt->max_reconnect_timeout)
		xprt->reestablish_timeout = xprt->max_reconnect_timeout;
	if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
		xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 49 100.00% 1 100.00%
Total 49 100.00% 1 100.00%

/**
 * xs_connect - connect a socket to a remote endpoint
 * @xprt: pointer to transport structure
 * @task: address of RPC task that manages state of connect request
 *
 * TCP: If the remote end dropped the connection, delay reconnecting.
 *
 * UDP socket connects are synchronous, but we use a work queue anyway
 * to guarantee that even unprivileged user processes can set up a
 * socket on a privileged port.
 *
 * If a UDP socket connect fails, the delay behavior here prevents
 * retry floods (hard mounts).
 */


static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
	unsigned long delay = 0;

	WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));

	if (transport->sock != NULL) {
		dprintk("RPC:       xs_connect delayed xprt %p for %lu "
				"seconds\n",
				xprt, xprt->reestablish_timeout / HZ);

		/* Start by resetting any existing state */
		xs_reset_transport(transport);

		delay = xs_reconnect_delay(xprt);
		xs_reconnect_backoff(xprt);

	} else
		dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);

	queue_delayed_work(xprtiod_workqueue,
			&transport->connect_worker,
			delay);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 71 63.39% 7 46.67%
Trond Myklebust 40 35.71% 7 46.67%
David Howells 1 0.89% 1 6.67%
Total 112 100.00% 15 100.00%

/**
 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
 * @xprt: rpc_xprt struct containing statistics
 * @seq: output file
 *
 */


static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
{
	long idle_time = 0;

	if (xprt_connected(xprt))
		idle_time = (long)(jiffies - xprt->last_used) / HZ;

	seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
			"%llu %llu %lu %llu %llu\n",
			xprt->stat.bind_count,
			xprt->stat.connect_count,
			xprt->stat.connect_time,
			idle_time,
			xprt->stat.sends,
			xprt->stat.recvs,
			xprt->stat.bad_xids,
			xprt->stat.req_u,
			xprt->stat.bklog_u,
			xprt->stat.max_slots,
			xprt->stat.sending_u,
			xprt->stat.pending_u);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 100 84.03% 1 50.00%
Andy Adamson 19 15.97% 1 50.00%
Total 119 100.00% 2 100.00%

/**
 * xs_udp_print_stats - display UDP socket-specifc stats
 * @xprt: rpc_xprt struct containing statistics
 * @seq: output file
 *
 */


static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);

	seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
			"%lu %llu %llu\n",
			transport->srcport,
			xprt->stat.bind_count,
			xprt->stat.sends,
			xprt->stat.recvs,
			xprt->stat.bad_xids,
			xprt->stat.req_u,
			xprt->stat.bklog_u,
			xprt->stat.max_slots,
			xprt->stat.sending_u,
			xprt->stat.pending_u);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 77 79.38% 3 75.00%
Andy Adamson 20 20.62% 1 25.00%
Total 97 100.00% 4 100.00%

/**
 * xs_tcp_print_stats - display TCP socket-specifc stats
 * @xprt: rpc_xprt struct containing statistics
 * @seq: output file
 *
 */


static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
{
	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
	long idle_time = 0;

	if (xprt_connected(xprt))
		idle_time = (long)(jiffies - xprt->last_used) / HZ;

	seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
			"%llu %llu %lu %llu %llu\n",
			transport->srcport,
			xprt->stat.bind_count,
			xprt->stat.connect_count,
			xprt->stat.connect_time,
			idle_time,
			xprt->stat.sends,
			xprt->stat.recvs,
			xprt->stat.bad_xids,
			xprt->stat.req_u,
			xprt->stat.bklog_u,
			xprt->stat.max_slots,
			xprt->stat.sending_u,
			xprt->stat.pending_u);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 118 85.51% 3 75.00%
Andy Adamson 20 14.49% 1 25.00%
Total 138 100.00% 4 100.00%

/*
 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
 * to use the server side send routines.
 */


static int bc_malloc(struct rpc_task *task)
{
	struct rpc_rqst *rqst = task->tk_rqstp;
	size_t size = rqst->rq_callsize;
	struct page *page;
	struct rpc_buffer *buf;

	if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
		WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
			  size);
		return -EINVAL;
	}

	page = alloc_page(GFP_KERNEL);
	if (!page)
		return -ENOMEM;

	buf = page_address(page);
	buf->len = PAGE_SIZE;

	rqst->rq_buffer = buf->data;
	rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Rahul Iyer 50 41.67% 1 20.00%
Chuck Lever 39 32.50% 1 20.00%
Jeff Layton 16 13.33% 1 20.00%
Weston Andros Adamson 14 11.67% 1 20.00%
H Hartley Sweeten 1 0.83% 1 20.00%
Total 120 100.00% 5 100.00%

/*
 * Free the space allocated in the bc_alloc routine
 */


static void bc_free(struct rpc_task *task)
{
	void *buffer = task->tk_rqstp->rq_buffer;
	struct rpc_buffer *buf;

	buf = container_of(buffer, struct rpc_buffer, data);
	free_page((unsigned long)buf);
}

Contributors
Person Tokens Prop Commits CommitProp
Rahul Iyer 33 70.21% 1 33.33%
Chuck Lever 13 27.66% 1 33.33%
H Hartley Sweeten 1 2.13% 1 33.33%
Total 47 100.00% 3 100.00%

/*
 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
 */


static int bc_sendto(struct rpc_rqst *req)
{
	int len;
	struct xdr_buf *xbufp = &req->rq_snd_buf;
	struct rpc_xprt *xprt = req->rq_xprt;
	struct sock_xprt *transport =
				container_of(xprt, struct sock_xprt, xprt);
	struct socket *sock = transport->sock;
	unsigned long headoff;
	unsigned long tailoff;

	xs_encode_stream_record_marker(xbufp);

	tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
	headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
	len = svc_send_common(sock, xbufp,
			      virt_to_page(xbufp->head[0].iov_base), headoff,
			      xbufp->tail[0].iov_base, tailoff);

	if (len != xbufp->len) {
		printk(KERN_NOTICE "Error sending entire callback!\n");
		len = -EAGAIN;
	}

	return len;
}

Contributors
Person Tokens Prop Commits CommitProp
Rahul Iyer 163 99.39% 1 50.00%
Chuck Lever 1 0.61% 1 50.00%
Total 164 100.00% 2 100.00%

/*
 * The send routine. Borrows from svc_send
 */


static int bc_send_request(struct rpc_task *task)
{
	struct rpc_rqst *req = task->tk_rqstp;
	struct svc_xprt	*xprt;
	int len;

	dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
	/*
         * Get the server socket associated with this callback xprt
         */
	xprt = req->rq_xprt->bc_xprt;

	/*
         * Grab the mutex to serialize data as the connection is shared
         * with the fore channel
         */
	if (!mutex_trylock(&xprt->xpt_mutex)) {
		rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
		if (!mutex_trylock(&xprt->xpt_mutex))
			return -EAGAIN;
		rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
	}
	if (test_bit(XPT_DEAD, &xprt->xpt_flags))
		len = -ENOTCONN;
	else
		len = bc_sendto(req);
	mutex_unlock(&xprt->xpt_mutex);

	if (len > 0)
		len = 0;

	return len;
}

Contributors
Person Tokens Prop Commits CommitProp
Rahul Iyer 145 99.32% 1 50.00%
Andrzej Hajda 1 0.68% 1 50.00%
Total 146 100.00% 2 100.00%

/*
 * The close routine. Since this is client initiated, we do nothing
 */



static void bc_close(struct rpc_xprt *xprt)
{
}

Contributors
Person Tokens Prop Commits CommitProp
Rahul Iyer 9 90.00% 1 50.00%
Joe Perches 1 10.00% 1 50.00%
Total 10 100.00% 2 100.00%

/*
 * The xprt destroy routine. Again, because this connection is client
 * initiated, we do nothing
 */



static void bc_destroy(struct rpc_xprt *xprt)
{
	dprintk("RPC:       bc_destroy xprt %p\n", xprt);

	xs_xprt_free(xprt);
	module_put(THIS_MODULE);
}

Contributors
Person Tokens Prop Commits CommitProp
Kinglong Mee 19 67.86% 1 50.00%
Rahul Iyer 9 32.14% 1 50.00%
Total 28 100.00% 2 100.00%


static const struct rpc_xprt_ops xs_local_ops = {
	.reserve_xprt		= xprt_reserve_xprt,
	.release_xprt		= xs_tcp_release_xprt,
	.alloc_slot		= xprt_alloc_slot,
	.rpcbind		= xs_local_rpcbind,
	.set_port		= xs_local_set_port,
	.connect		= xs_local_connect,
	.buf_alloc		= rpc_malloc,
	.buf_free		= rpc_free,
	.send_request		= xs_local_send_request,
	.set_retrans_timeout	= xprt_set_retrans_timeout_def,
	.close			= xs_close,
	.destroy		= xs_destroy,
	.print_stats		= xs_local_print_stats,
	.enable_swap		= xs_enable_swap,
	.disable_swap		= xs_disable_swap,
};


static const struct rpc_xprt_ops xs_udp_ops = {
	.set_buffer_size	= xs_udp_set_buffer_size,
	.reserve_xprt		= xprt_reserve_xprt_cong,
	.release_xprt		= xprt_release_xprt_cong,
	.alloc_slot		= xprt_alloc_slot,
	.rpcbind		= rpcb_getport_async,
	.set_port		= xs_set_port,
	.connect		= xs_connect,
	.buf_alloc		= rpc_malloc,
	.buf_free		= rpc_free,
	.send_request		= xs_udp_send_request,
	.set_retrans_timeout	= xprt_set_retrans_timeout_rtt,
	.timer			= xs_udp_timer,
	.release_request	= xprt_release_rqst_cong,
	.close			= xs_close,
	.destroy		= xs_destroy,
	.print_stats		= xs_udp_print_stats,
	.enable_swap		= xs_enable_swap,
	.disable_swap		= xs_disable_swap,
	.inject_disconnect	= xs_inject_disconnect,
};


static const struct rpc_xprt_ops xs_tcp_ops = {
	.reserve_xprt		= xprt_reserve_xprt,
	.release_xprt		= xs_tcp_release_xprt,
	.alloc_slot		= xprt_lock_and_alloc_slot,
	.rpcbind		= rpcb_getport_async,
	.set_port		= xs_set_port,
	.connect		= xs_connect,
	.buf_alloc		= rpc_malloc,
	.buf_free		= rpc_free,
	.send_request		= xs_tcp_send_request,
	.set_retrans_timeout	= xprt_set_retrans_timeout_def,
	.close			= xs_tcp_shutdown,
	.destroy		= xs_destroy,
	.set_connect_timeout	= xs_tcp_set_connect_timeout,
	.print_stats		= xs_tcp_print_stats,
	.enable_swap		= xs_enable_swap,
	.disable_swap		= xs_disable_swap,
	.inject_disconnect	= xs_inject_disconnect,
#ifdef CONFIG_SUNRPC_BACKCHANNEL
	.bc_setup		= xprt_setup_bc,
	.bc_up			= xs_tcp_bc_up,
	.bc_maxpayload		= xs_tcp_bc_maxpayload,
	.bc_free_rqst		= xprt_free_bc_rqst,
	.bc_destroy		= xprt_destroy_bc,
#endif
};

/*
 * The rpc_xprt_ops for the server backchannel
 */


static const struct rpc_xprt_ops bc_tcp_ops = {
	.reserve_xprt		= xprt_reserve_xprt,
	.release_xprt		= xprt_release_xprt,
	.alloc_slot		= xprt_alloc_slot,
	.buf_alloc		= bc_malloc,
	.buf_free		= bc_free,
	.send_request		= bc_send_request,
	.set_retrans_timeout	= xprt_set_retrans_timeout_def,
	.close			= bc_close,
	.destroy		= bc_destroy,
	.print_stats		= xs_tcp_print_stats,
	.enable_swap		= xs_enable_swap,
	.disable_swap		= xs_disable_swap,
	.inject_disconnect	= xs_inject_disconnect,
};



static int xs_init_anyaddr(const int family, struct sockaddr *sap)
{
	static const struct sockaddr_in sin = {
		.sin_family		= AF_INET,
		.sin_addr.s_addr	= htonl(INADDR_ANY),
        };
	static const struct sockaddr_in6 sin6 = {
		.sin6_family		= AF_INET6,
		.sin6_addr		= IN6ADDR_ANY_INIT,
        };

	switch (family) {
	case AF_LOCAL:
		break;
	case AF_INET:
		memcpy(sap, &sin, sizeof(sin));
		break;
	case AF_INET6:
		memcpy(sap, &sin6, sizeof(sin6));
		break;
	default:
		dprintk("RPC:       %s: Bad address family\n", __func__);
		return -EAFNOSUPPORT;
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 115 100.00% 2 100.00%
Total 115 100.00% 2 100.00%



static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
				      unsigned int slot_table_size,
				      unsigned int max_slot_table_size)
{
	struct rpc_xprt *xprt;
	struct sock_xprt *new;

	if (args->addrlen > sizeof(xprt->addr)) {
		dprintk("RPC:       xs_setup_xprt: address too large\n");
		return ERR_PTR(-EBADF);
	}

	xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
			max_slot_table_size);
	if (xprt == NULL) {
		dprintk("RPC:       xs_setup_xprt: couldn't allocate "
				"rpc_xprt\n");
		return ERR_PTR(-ENOMEM);
	}

	new = container_of(xprt, struct sock_xprt, xprt);
	mutex_init(&new->recv_mutex);
	memcpy(&xprt->addr, args->dstaddr, args->addrlen);
	xprt->addrlen = args->addrlen;
	if (args->srcaddr)
		memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
	else {
		int err;
		err = xs_init_anyaddr(args->dstaddr->sa_family,
					(struct sockaddr *)&new->srcaddr);
		if (err != 0) {
			xprt_free(xprt);
			return ERR_PTR(err);
		}
	}

	return xprt;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 187 87.79% 6 50.00%
Trond Myklebust 14 6.57% 2 16.67%
Stanislav Kinsbursky 7 3.29% 1 8.33%
Frank van Maarseveen 3 1.41% 1 8.33%
Pavel Emelyanov 1 0.47% 1 8.33%
Talpey, Thomas 1 0.47% 1 8.33%
Total 213 100.00% 12 100.00%


static const struct rpc_timeout xs_local_default_timeout = {
	.to_initval = 10 * HZ,
	.to_maxval = 10 * HZ,
	.to_retries = 2,
};

/**
 * xs_setup_local - Set up transport to use an AF_LOCAL socket
 * @args: rpc transport creation arguments
 *
 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
 */


static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
{
	struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
	struct sock_xprt *transport;
	struct rpc_xprt *xprt;
	struct rpc_xprt *ret;

	xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
			xprt_max_tcp_slot_table_entries);
	if (IS_ERR(xprt))
		return xprt;
	transport = container_of(xprt, struct sock_xprt, xprt);

	xprt->prot = 0;
	xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;

	xprt->bind_timeout = XS_BIND_TO;
	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
	xprt->idle_timeout = XS_IDLE_DISC_TO;

	xprt->ops = &xs_local_ops;
	xprt->timeout = &xs_local_default_timeout;

	INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn);
	INIT_DELAYED_WORK(&transport->connect_worker,
			xs_dummy_setup_socket);

	switch (sun->sun_family) {
	case AF_LOCAL:
		if (sun->sun_path[0] != '/') {
			dprintk("RPC:       bad AF_LOCAL address: %s\n",
					sun->sun_path);
			ret = ERR_PTR(-EINVAL);
			goto out_err;
		}
		xprt_set_bound(xprt);
		xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
		ret = ERR_PTR(xs_local_setup_socket(transport));
		if (ret)
			goto out_err;
		break;
	default:
		ret = ERR_PTR(-EAFNOSUPPORT);
		goto out_err;
	}

	dprintk("RPC:       set up xprt to %s via AF_LOCAL\n",
			xprt->address_strings[RPC_DISPLAY_ADDR]);

	if (try_module_get(THIS_MODULE))
		return xprt;
	ret = ERR_PTR(-EINVAL);
out_err:
	xs_xprt_free(xprt);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 228 81.14% 4 28.57%
J. Bruce Fields 17 6.05% 1 7.14%
Trond Myklebust 12 4.27% 3 21.43%
Neil Brown 10 3.56% 1 7.14%
Frank van Maarseveen 10 3.56% 2 14.29%
Pavel Emelyanov 3 1.07% 2 14.29%
Kinglong Mee 1 0.36% 1 7.14%
Total 281 100.00% 14 100.00%


static const struct rpc_timeout xs_udp_default_timeout = {
	.to_initval = 5 * HZ,
	.to_maxval = 30 * HZ,
	.to_increment = 5 * HZ,
	.to_retries = 5,
};

/**
 * xs_setup_udp - Set up transport to use a UDP socket
 * @args: rpc transport creation arguments
 *
 */


static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
{
	struct sockaddr *addr = args->dstaddr;
	struct rpc_xprt *xprt;
	struct sock_xprt *transport;
	struct rpc_xprt *ret;

	xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
			xprt_udp_slot_table_entries);
	if (IS_ERR(xprt))
		return xprt;
	transport = container_of(xprt, struct sock_xprt, xprt);

	xprt->prot = IPPROTO_UDP;
	xprt->tsh_size = 0;
	/* XXX: header size can vary due to auth type, IPv6, etc. */
	xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);

	xprt->bind_timeout = XS_BIND_TO;
	xprt->reestablish_timeout = XS_UDP_REEST_TO;
	xprt->idle_timeout = XS_IDLE_DISC_TO;

	xprt->ops = &xs_udp_ops;

	xprt->timeout = &xs_udp_default_timeout;

	INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
	INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);

	switch (addr->sa_family) {
	case AF_INET:
		if (((struct sockaddr_in *)addr)->sin_port != htons(0))
			xprt_set_bound(xprt);

		xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
		break;
	case AF_INET6:
		if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
			xprt_set_bound(xprt);

		xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
		break;
	default:
		ret = ERR_PTR(-EAFNOSUPPORT);
		goto out_err;
	}

	if (xprt_bound(xprt))
		dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
				xprt->address_strings[RPC_DISPLAY_ADDR],
				xprt->address_strings[RPC_DISPLAY_PORT],
				xprt->address_strings[RPC_DISPLAY_PROTO]);
	else
		dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
				xprt->address_strings[RPC_DISPLAY_ADDR],
				xprt->address_strings[RPC_DISPLAY_PROTO]);

	if (try_module_get(THIS_MODULE))
		return xprt;
	ret = ERR_PTR(-EINVAL);
out_err:
	xs_xprt_free(xprt);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 264 81.48% 14 58.33%
Trond Myklebust 24 7.41% 4 16.67%
J. Bruce Fields 22 6.79% 1 4.17%
Talpey, Thomas 8 2.47% 2 8.33%
Frank van Maarseveen 4 1.23% 1 4.17%
Kinglong Mee 1 0.31% 1 4.17%
Adrian Bunk 1 0.31% 1 4.17%
Total 324 100.00% 24 100.00%


static const struct rpc_timeout xs_tcp_default_timeout = {
	.to_initval = 60 * HZ,
	.to_maxval = 60 * HZ,
	.to_retries = 2,
};

/**
 * xs_setup_tcp - Set up transport to use a TCP socket
 * @args: rpc transport creation arguments
 *
 */


static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
{
	struct sockaddr *addr = args->dstaddr;
	struct rpc_xprt *xprt;
	struct sock_xprt *transport;
	struct rpc_xprt *ret;
	unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;

	if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
		max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;

	xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
			max_slot_table_size);
	if (IS_ERR(xprt))
		return xprt;
	transport = container_of(xprt, struct sock_xprt, xprt);

	xprt->prot = IPPROTO_TCP;
	xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;

	xprt->bind_timeout = XS_BIND_TO;
	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
	xprt->idle_timeout = XS_IDLE_DISC_TO;

	xprt->ops = &xs_tcp_ops;
	xprt->timeout = &xs_tcp_default_timeout;

	xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
	xprt->connect_timeout = xprt->timeout->to_initval *
		(xprt->timeout->to_retries + 1);

	INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn);
	INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);

	switch (addr->sa_family) {
	case AF_INET:
		if (((struct sockaddr_in *)addr)->sin_port != htons(0))
			xprt_set_bound(xprt);

		xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
		break;
	case AF_INET6:
		if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
			xprt_set_bound(xprt);

		xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
		break;
	default:
		ret = ERR_PTR(-EAFNOSUPPORT);
		goto out_err;
	}

	if (xprt_bound(xprt))
		dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
				xprt->address_strings[RPC_DISPLAY_ADDR],
				xprt->address_strings[RPC_DISPLAY_PORT],
				xprt->address_strings[RPC_DISPLAY_PROTO]);
	else
		dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
				xprt->address_strings[RPC_DISPLAY_ADDR],
				xprt->address_strings[RPC_DISPLAY_PROTO]);

	if (try_module_get(THIS_MODULE))
		return xprt;
	ret = ERR_PTR(-EINVAL);
out_err:
	xs_xprt_free(xprt);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 255 69.11% 15 55.56%
Trond Myklebust 72 19.51% 6 22.22%
J. Bruce Fields 22 5.96% 1 3.70%
Talpey, Thomas 14 3.79% 2 7.41%
Frank van Maarseveen 4 1.08% 1 3.70%
Adrian Bunk 1 0.27% 1 3.70%
Kinglong Mee 1 0.27% 1 3.70%
Total 369 100.00% 27 100.00%

/**
 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
 * @args: rpc transport creation arguments
 *
 */


static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
{
	struct sockaddr *addr = args->dstaddr;
	struct rpc_xprt *xprt;
	struct sock_xprt *transport;
	struct svc_sock *bc_sock;
	struct rpc_xprt *ret;

	xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
			xprt_tcp_slot_table_entries);
	if (IS_ERR(xprt))
		return xprt;
	transport = container_of(xprt, struct sock_xprt, xprt);

	xprt->prot = IPPROTO_TCP;
	xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
	xprt->timeout = &xs_tcp_default_timeout;

	/* backchannel */
	xprt_set_bound(xprt);
	xprt->bind_timeout = 0;
	xprt->reestablish_timeout = 0;
	xprt->idle_timeout = 0;

	xprt->ops = &bc_tcp_ops;

	switch (addr->sa_family) {
	case AF_INET:
		xs_format_peer_addresses(xprt, "tcp",
					 RPCBIND_NETID_TCP);
		break;
	case AF_INET6:
		xs_format_peer_addresses(xprt, "tcp",
				   RPCBIND_NETID_TCP6);
		break;
	default:
		ret = ERR_PTR(-EAFNOSUPPORT);
		goto out_err;
	}

	dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
			xprt->address_strings[RPC_DISPLAY_ADDR],
			xprt->address_strings[RPC_DISPLAY_PORT],
			xprt->address_strings[RPC_DISPLAY_PROTO]);

	/*
         * Once we've associated a backchannel xprt with a connection,
         * we want to keep it around as long as the connection lasts,
         * in case we need to start using it for a backchannel again;
         * this reference won't be dropped until bc_xprt is destroyed.
         */
	xprt_get(xprt);
	args->bc_xprt->xpt_bc_xprt = xprt;
	xprt->bc_xprt = args->bc_xprt;
	bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
	transport->sock = bc_sock->sk_sock;
	transport->inet = bc_sock->sk_sk;

	/*
         * Since we don't want connections for the backchannel, we set
         * the xprt status to connected
         */
	xprt_set_connected(xprt);

	if (try_module_get(THIS_MODULE))
		return xprt;

	args->bc_xprt->xpt_bc_xprt = NULL;
	args->bc_xprt->xpt_bc_xps = NULL;
	xprt_put(xprt);
	ret = ERR_PTR(-EINVAL);
out_err:
	xs_xprt_free(xprt);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Alexandros Batsakis 220 69.18% 1 12.50%
J. Bruce Fields 86 27.04% 3 37.50%
Kinglong Mee 9 2.83% 2 25.00%
Trond Myklebust 2 0.63% 1 12.50%
Weng Meiling 1 0.31% 1 12.50%
Total 318 100.00% 8 100.00%


static struct xprt_class	xs_local_transport = {
	.list		= LIST_HEAD_INIT(xs_local_transport.list),
	.name		= "named UNIX socket",
	.owner		= THIS_MODULE,
	.ident		= XPRT_TRANSPORT_LOCAL,
	.setup		= xs_setup_local,
};


static struct xprt_class	xs_udp_transport = {
	.list		= LIST_HEAD_INIT(xs_udp_transport.list),
	.name		= "udp",
	.owner		= THIS_MODULE,
	.ident		= XPRT_TRANSPORT_UDP,
	.setup		= xs_setup_udp,
};


static struct xprt_class	xs_tcp_transport = {
	.list		= LIST_HEAD_INIT(xs_tcp_transport.list),
	.name		= "tcp",
	.owner		= THIS_MODULE,
	.ident		= XPRT_TRANSPORT_TCP,
	.setup		= xs_setup_tcp,
};


static struct xprt_class	xs_bc_tcp_transport = {
	.list		= LIST_HEAD_INIT(xs_bc_tcp_transport.list),
	.name		= "tcp NFSv4.1 backchannel",
	.owner		= THIS_MODULE,
	.ident		= XPRT_TRANSPORT_BC_TCP,
	.setup		= xs_setup_bc_tcp,
};

/**
 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
 *
 */


int init_socket_xprt(void)
{
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
	if (!sunrpc_table_header)
		sunrpc_table_header = register_sysctl_table(sunrpc_table);
#endif

	xprt_register_transport(&xs_local_transport);
	xprt_register_transport(&xs_udp_transport);
	xprt_register_transport(&xs_tcp_transport);
	xprt_register_transport(&xs_bc_tcp_transport);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 30 55.56% 3 50.00%
Talpey, Thomas 12 22.22% 1 16.67%
Jeff Layton 6 11.11% 1 16.67%
Alexandros Batsakis 6 11.11% 1 16.67%
Total 54 100.00% 6 100.00%

/**
 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
 *
 */


void cleanup_socket_xprt(void)
{
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
	if (sunrpc_table_header) {
		unregister_sysctl_table(sunrpc_table_header);
		sunrpc_table_header = NULL;
	}
#endif

	xprt_unregister_transport(&xs_local_transport);
	xprt_unregister_transport(&xs_udp_transport);
	xprt_unregister_transport(&xs_tcp_transport);
	xprt_unregister_transport(&xs_bc_tcp_transport);
}

Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 30 55.56% 3 50.00%
Talpey, Thomas 12 22.22% 1 16.67%
Jeff Layton 6 11.11% 1 16.67%
Alexandros Batsakis 6 11.11% 1 16.67%
Total 54 100.00% 6 100.00%



static int param_set_uint_minmax(const char *val,
		const struct kernel_param *kp,
		unsigned int min, unsigned int max)
{
	unsigned int num;
	int ret;

	if (!val)
		return -EINVAL;
	ret = kstrtouint(val, 0, &num);
	if (ret)
		return ret;
	if (num < min || num > max)
		return -EINVAL;
	*((unsigned int *)kp->arg) = num;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 82 90.11% 1 25.00%
Dan Carpenter 6 6.59% 1 25.00%
Daniel Walter 2 2.20% 1 25.00%
Rusty Russell 1 1.10% 1 25.00%
Total 91 100.00% 4 100.00%



static int param_set_portnr(const char *val, const struct kernel_param *kp)
{
	if (kp->arg == &xprt_min_resvport)
		return param_set_uint_minmax(val, kp,
			RPC_MIN_RESVPORT,
			xprt_max_resvport);
	return param_set_uint_minmax(val, kp,
			xprt_min_resvport,
			RPC_MAX_RESVPORT);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 28 56.00% 1 33.33%
Frank Sorenson 21 42.00% 1 33.33%
Rusty Russell 1 2.00% 1 33.33%
Total 50 100.00% 3 100.00%


static const struct kernel_param_ops param_ops_portnr = {
	.set = param_set_portnr,
	.get = param_get_uint,
};


#define param_check_portnr(name, p) \
	__param_check(name, p, unsigned int);

module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);



static int param_set_slot_table_size(const char *val,
				     const struct kernel_param *kp)
{
	return param_set_uint_minmax(val, kp,
			RPC_MIN_SLOT_TABLE,
			RPC_MAX_SLOT_TABLE);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 28 96.55% 1 50.00%
Rusty Russell 1 3.45% 1 50.00%
Total 29 100.00% 2 100.00%


static const struct kernel_param_ops param_ops_slot_table_size = {
	.set = param_set_slot_table_size,
	.get = param_get_uint,
};


#define param_check_slot_table_size(name, p) \
	__param_check(name, p, unsigned int);



static int param_set_max_slot_table_size(const char *val,
				     const struct kernel_param *kp)
{
	return param_set_uint_minmax(val, kp,
			RPC_MIN_SLOT_TABLE,
			RPC_MAX_SLOT_TABLE_LIMIT);
}

Contributors
Person Tokens Prop Commits CommitProp
Trond Myklebust 29 100.00% 1 100.00%
Total 29 100.00% 1 100.00%


static const struct kernel_param_ops param_ops_max_slot_table_size = {
	.set = param_set_max_slot_table_size,
	.get = param_get_uint,
};


#define param_check_max_slot_table_size(name, p) \
	__param_check(name, p, unsigned int);

module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
		   slot_table_size, 0644);
module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
		   max_slot_table_size, 0644);
module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
		   slot_table_size, 0644);

Overall Contributors
Person Tokens Prop Commits CommitProp
Chuck Lever 7157 50.31% 78 26.99%
Trond Myklebust 4126 29.00% 106 36.68%
Ricardo Labiaga 506 3.56% 3 1.04%
Rahul Iyer 474 3.33% 1 0.35%
Alexandros Batsakis 272 1.91% 1 0.35%
Jeff Layton 258 1.81% 10 3.46%
J. Bruce Fields 248 1.74% 6 2.08%
Pavel Emelyanov 163 1.15% 12 4.15%
Talpey, Thomas 134 0.94% 5 1.73%
Mel Gorman 117 0.82% 1 0.35%
Neil Brown 111 0.78% 6 2.08%
Jason Baron 106 0.75% 2 0.69%
Peter Zijlstra 93 0.65% 2 0.69%
Andy Adamson 59 0.41% 1 0.35%
Kinglong Mee 53 0.37% 3 1.04%
Frank van Maarseveen 49 0.34% 2 0.69%
David Vrabel 39 0.27% 1 0.35%
Ilpo Järvinen 35 0.25% 1 0.35%
Eric Dumazet 33 0.23% 5 1.73%
Rusty Russell 29 0.20% 1 0.35%
Frank Sorenson 25 0.18% 3 1.04%
Weston Andros Adamson 24 0.17% 2 0.69%
David Howells 17 0.12% 2 0.69%
Chris Perl 10 0.07% 1 0.35%
Stanislav Kinsbursky 7 0.05% 1 0.35%
Dan Carpenter 6 0.04% 1 0.35%
Alexey Dobriyan 6 0.04% 2 0.69%
Harvey Harrison 5 0.04% 3 1.04%
Linus Torvalds 5 0.04% 1 0.35%
Herbert Xu 5 0.04% 1 0.35%
Andy Chittenden 5 0.04% 1 0.35%
Stefan Hajnoczi 5 0.04% 2 0.69%
Bryan Schumaker 5 0.04% 1 0.35%
Joe Perches 5 0.04% 3 1.04%
Gustavo A. R. Silva 4 0.03% 1 0.35%
Hannes Frederic Sowa 4 0.03% 1 0.35%
Eric W. Biedermann 3 0.02% 1 0.35%
Luis R. Rodriguez 3 0.02% 1 0.35%
Ben Hutchings 3 0.02% 1 0.35%
Daniel Walter 2 0.01% 1 0.35%
Sridhar Samudrala 2 0.01% 1 0.35%
Adrian Bunk 2 0.01% 1 0.35%
Paolo Abeni 2 0.01% 2 0.69%
H Hartley Sweeten 2 0.01% 1 0.35%
Andrzej Hajda 1 0.01% 1 0.35%
Lucas De Marchi 1 0.01% 1 0.35%
Weng Meiling 1 0.01% 1 0.35%
Greg Kroah-Hartman 1 0.01% 1 0.35%
Aruna-Hewapathirane 1 0.01% 1 0.35%
Alan Cox 1 0.01% 1 0.35%
Willem de Bruijn 1 0.01% 1 0.35%
Total 14226 100.00% 289 100.00%
Directory: net/sunrpc

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Chuck Lever	121	100.00%	3	100.00%
Total	121	100.00%	3	100.00%
cregit-Linux how code gets into the kernel

Release 4.15 net/sunrpc/xprtsock.c

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