X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=net%2Fsunrpc%2Fxprtsock.c;h=3d739e5d15d8b65a77be7fcb80a9ed012ba7c0d3;hb=52c9948b1fd80381ba5a9a87dcc4fbe3cf4979b8;hp=b49e434c094f8ee93be273e9311093ede6f761bb;hpb=1f0fa15432e49547c3fa915644c7e0c0975809e7;p=safe%2Fjmp%2Flinux-2.6 diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index b49e434..3d739e5 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -32,14 +32,19 @@ #include #include #include +#include #include #include +#ifdef CONFIG_NFS_V4_1 +#include +#endif #include #include #include #include +#include "sunrpc.h" /* * xprtsock tunables */ @@ -49,6 +54,9 @@ unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; +#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 @@ -73,64 +81,58 @@ static struct ctl_table_header *sunrpc_table_header; */ static ctl_table xs_tunables_table[] = { { - .ctl_name = CTL_SLOTTABLE_UDP, .procname = "udp_slot_table_entries", .data = &xprt_udp_slot_table_entries, .maxlen = sizeof(unsigned int), .mode = 0644, - .proc_handler = &proc_dointvec_minmax, - .strategy = &sysctl_intvec, + .proc_handler = proc_dointvec_minmax, .extra1 = &min_slot_table_size, .extra2 = &max_slot_table_size }, { - .ctl_name = CTL_SLOTTABLE_TCP, .procname = "tcp_slot_table_entries", .data = &xprt_tcp_slot_table_entries, .maxlen = sizeof(unsigned int), .mode = 0644, - .proc_handler = &proc_dointvec_minmax, - .strategy = &sysctl_intvec, + .proc_handler = proc_dointvec_minmax, .extra1 = &min_slot_table_size, .extra2 = &max_slot_table_size }, { - .ctl_name = CTL_MIN_RESVPORT, .procname = "min_resvport", .data = &xprt_min_resvport, .maxlen = sizeof(unsigned int), .mode = 0644, - .proc_handler = &proc_dointvec_minmax, - .strategy = &sysctl_intvec, + .proc_handler = proc_dointvec_minmax, .extra1 = &xprt_min_resvport_limit, .extra2 = &xprt_max_resvport_limit }, { - .ctl_name = CTL_MAX_RESVPORT, .procname = "max_resvport", .data = &xprt_max_resvport, .maxlen = sizeof(unsigned int), .mode = 0644, - .proc_handler = &proc_dointvec_minmax, - .strategy = &sysctl_intvec, + .proc_handler = proc_dointvec_minmax, .extra1 = &xprt_min_resvport_limit, .extra2 = &xprt_max_resvport_limit }, { - .ctl_name = 0, + .procname = "tcp_fin_timeout", + .data = &xs_tcp_fin_timeout, + .maxlen = sizeof(xs_tcp_fin_timeout), + .mode = 0644, + .proc_handler = proc_dointvec_jiffies, }, + { }, }; static ctl_table sunrpc_table[] = { { - .ctl_name = CTL_SUNRPC, .procname = "sunrpc", .mode = 0555, .child = xs_tunables_table }, - { - .ctl_name = 0, - }, + { }, }; #endif @@ -234,8 +236,8 @@ struct sock_xprt { * Connection of transports */ struct delayed_work connect_worker; - struct sockaddr_storage addr; - unsigned short port; + struct sockaddr_storage srcaddr; + unsigned short srcport; /* * UDP socket buffer size parameters @@ -259,6 +261,13 @@ struct sock_xprt { #define TCP_RCV_COPY_FRAGHDR (1UL << 1) #define TCP_RCV_COPY_XID (1UL << 2) #define TCP_RCV_COPY_DATA (1UL << 3) +#define TCP_RCV_READ_CALLDIR (1UL << 4) +#define TCP_RCV_COPY_CALLDIR (1UL << 5) + +/* + * TCP RPC flags + */ +#define TCP_RPC_REPLY (1UL << 6) static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) { @@ -275,117 +284,60 @@ static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) return (struct sockaddr_in6 *) &xprt->addr; } -static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt, - const char *protocol, - const char *netid) +static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) { - struct sockaddr_in *addr = xs_addr_in(xprt); - char *buf; + struct sockaddr *sap = xs_addr(xprt); + struct sockaddr_in6 *sin6; + struct sockaddr_in *sin; + char buf[128]; - buf = kzalloc(20, GFP_KERNEL); - if (buf) { - snprintf(buf, 20, "%pI4", &addr->sin_addr.s_addr); - } - xprt->address_strings[RPC_DISPLAY_ADDR] = buf; - - buf = kzalloc(8, GFP_KERNEL); - if (buf) { - snprintf(buf, 8, "%u", - ntohs(addr->sin_port)); - } - xprt->address_strings[RPC_DISPLAY_PORT] = buf; - - xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; - - buf = kzalloc(48, GFP_KERNEL); - if (buf) { - snprintf(buf, 48, "addr=%pI4 port=%u proto=%s", - &addr->sin_addr.s_addr, - ntohs(addr->sin_port), - protocol); - } - xprt->address_strings[RPC_DISPLAY_ALL] = buf; + (void)rpc_ntop(sap, buf, sizeof(buf)); + xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); - buf = kzalloc(10, GFP_KERNEL); - if (buf) { - snprintf(buf, 10, "%02x%02x%02x%02x", - NIPQUAD(addr->sin_addr.s_addr)); - } - xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; - - buf = kzalloc(8, GFP_KERNEL); - if (buf) { - snprintf(buf, 8, "%4hx", - ntohs(addr->sin_port)); - } - xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; - - buf = kzalloc(30, GFP_KERNEL); - if (buf) { - snprintf(buf, 30, "%pI4.%u.%u", - &addr->sin_addr.s_addr, - ntohs(addr->sin_port) >> 8, - ntohs(addr->sin_port) & 0xff); + switch (sap->sa_family) { + case AF_INET: + sin = xs_addr_in(xprt); + (void)snprintf(buf, sizeof(buf), "%02x%02x%02x%02x", + NIPQUAD(sin->sin_addr.s_addr)); + break; + case AF_INET6: + sin6 = xs_addr_in6(xprt); + (void)snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); + break; + default: + BUG(); } - xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; - - xprt->address_strings[RPC_DISPLAY_NETID] = netid; + xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); } -static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt, - const char *protocol, - const char *netid) +static void xs_format_common_peer_ports(struct rpc_xprt *xprt) { - struct sockaddr_in6 *addr = xs_addr_in6(xprt); - char *buf; + struct sockaddr *sap = xs_addr(xprt); + char buf[128]; - buf = kzalloc(40, GFP_KERNEL); - if (buf) { - snprintf(buf, 40, "%pI6",&addr->sin6_addr); - } - xprt->address_strings[RPC_DISPLAY_ADDR] = buf; + (void)snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); + xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); - buf = kzalloc(8, GFP_KERNEL); - if (buf) { - snprintf(buf, 8, "%u", - ntohs(addr->sin6_port)); - } - xprt->address_strings[RPC_DISPLAY_PORT] = buf; + (void)snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); + xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); +} +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); +} - buf = kzalloc(64, GFP_KERNEL); - if (buf) { - snprintf(buf, 64, "addr=%pI6 port=%u proto=%s", - &addr->sin6_addr, - ntohs(addr->sin6_port), - protocol); - } - xprt->address_strings[RPC_DISPLAY_ALL] = buf; - - buf = kzalloc(36, GFP_KERNEL); - if (buf) - snprintf(buf, 36, "%pi6", &addr->sin6_addr); - - xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; - - buf = kzalloc(8, GFP_KERNEL); - if (buf) { - snprintf(buf, 8, "%4hx", - ntohs(addr->sin6_port)); - } - xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; - - buf = kzalloc(50, GFP_KERNEL); - if (buf) { - snprintf(buf, 50, "%pI6.%u.%u", - &addr->sin6_addr, - ntohs(addr->sin6_port) >> 8, - ntohs(addr->sin6_port) & 0xff); - } - xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; +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]); - xprt->address_strings[RPC_DISPLAY_NETID] = netid; + xs_format_common_peer_ports(xprt); } static void xs_free_peer_addresses(struct rpc_xprt *xprt) @@ -467,7 +419,7 @@ static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, int err, sent = 0; if (unlikely(!sock)) - return -ENOTCONN; + return -ENOTSOCK; clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); if (base != 0) { @@ -521,11 +473,12 @@ static void xs_nospace_callback(struct rpc_task *task) * @task: task to put to sleep * */ -static void xs_nospace(struct rpc_task *task) +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); + int ret = 0; dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", task->tk_pid, req->rq_slen - req->rq_bytes_sent, @@ -537,6 +490,7 @@ static void xs_nospace(struct rpc_task *task) /* Don't race with disconnect */ if (xprt_connected(xprt)) { if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { + ret = -EAGAIN; /* * Notify TCP that we're limited by the application * window size @@ -548,10 +502,11 @@ static void xs_nospace(struct rpc_task *task) } } else { clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); - task->tk_status = -ENOTCONN; + ret = -ENOTCONN; } spin_unlock_bh(&xprt->transport_lock); + return ret; } /** @@ -577,6 +532,8 @@ static int xs_udp_send_request(struct rpc_task *task) 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, @@ -592,24 +549,28 @@ static int xs_udp_send_request(struct rpc_task *task) /* Still some bytes left; set up for a retry later. */ status = -EAGAIN; } + if (!transport->sock) + goto out; switch (status) { + case -ENOTSOCK: + status = -ENOTCONN; + /* Should we call xs_close() here? */ + break; case -EAGAIN: - xs_nospace(task); + status = xs_nospace(task); break; + default: + dprintk("RPC: sendmsg returned unrecognized error %d\n", + -status); case -ENETUNREACH: case -EPIPE: case -ECONNREFUSED: /* When the server has died, an ICMP port unreachable message * prompts ECONNREFUSED. */ clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); - break; - default: - clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); - dprintk("RPC: sendmsg returned unrecognized error %d\n", - -status); } - +out: return status; } @@ -691,26 +652,28 @@ static int xs_tcp_send_request(struct rpc_task *task) status = -EAGAIN; break; } + if (!transport->sock) + goto out; switch (status) { + case -ENOTSOCK: + status = -ENOTCONN; + /* Should we call xs_close() here? */ + break; case -EAGAIN: - xs_nospace(task); + status = xs_nospace(task); break; + default: + dprintk("RPC: sendmsg returned unrecognized error %d\n", + -status); case -ECONNRESET: + case -EPIPE: xs_tcp_shutdown(xprt); case -ECONNREFUSED: case -ENOTCONN: - case -EPIPE: - status = -ENOTCONN; - clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); - break; - default: - dprintk("RPC: sendmsg returned unrecognized error %d\n", - -status); clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); - xs_tcp_shutdown(xprt); } - +out: return status; } @@ -757,23 +720,13 @@ static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *s sk->sk_error_report = transport->old_error_report; } -/** - * 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. - */ -static void xs_close(struct rpc_xprt *xprt) +static void xs_reset_transport(struct sock_xprt *transport) { - struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); struct socket *sock = transport->sock; struct sock *sk = transport->inet; - if (!sk) - goto clear_close_wait; - - dprintk("RPC: xs_close xprt %p\n", xprt); + if (sk == NULL) + return; write_lock_bh(&sk->sk_callback_lock); transport->inet = NULL; @@ -787,14 +740,43 @@ static void xs_close(struct rpc_xprt *xprt) sk->sk_no_check = 0; sock_release(sock); -clear_close_wait: +} + +/** + * 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; + smp_mb__before_clear_bit(); + clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); clear_bit(XPRT_CLOSE_WAIT, &xprt->state); clear_bit(XPRT_CLOSING, &xprt->state); smp_mb__after_clear_bit(); xprt_disconnect_done(xprt); } +static void xs_tcp_close(struct rpc_xprt *xprt) +{ + if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) + xs_close(xprt); + else + xs_tcp_shutdown(xprt); +} + /** * xs_destroy - prepare to shutdown a transport * @xprt: doomed transport @@ -878,7 +860,7 @@ static void xs_udp_data_ready(struct sock *sk, int len) UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); /* Something worked... */ - dst_confirm(skb->dst); + dst_confirm(skb_dst(skb)); xprt_adjust_cwnd(task, copied); xprt_update_rtt(task); @@ -916,7 +898,7 @@ static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_rea transport->tcp_offset = 0; /* Sanity check of the record length */ - if (unlikely(transport->tcp_reclen < 4)) { + if (unlikely(transport->tcp_reclen < 8)) { dprintk("RPC: invalid TCP record fragment length\n"); xprt_force_disconnect(xprt); return; @@ -951,33 +933,77 @@ static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_r if (used != len) return; transport->tcp_flags &= ~TCP_RCV_COPY_XID; - transport->tcp_flags |= TCP_RCV_COPY_DATA; + transport->tcp_flags |= TCP_RCV_READ_CALLDIR; transport->tcp_copied = 4; - dprintk("RPC: reading reply for XID %08x\n", + 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); } -static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) +static inline void xs_tcp_read_calldir(struct sock_xprt *transport, + struct xdr_skb_reader *desc) { - struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); - struct rpc_rqst *req; + size_t len, used; + u32 offset; + __be32 calldir; + + /* + * 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(calldir) - offset; + dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); + used = xdr_skb_read_bits(desc, &calldir, len); + transport->tcp_offset += used; + if (used != len) + return; + transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; + transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; + transport->tcp_flags |= TCP_RCV_COPY_DATA; + /* + * 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' + */ + if (ntohl(calldir) == RPC_REPLY) + transport->tcp_flags |= TCP_RPC_REPLY; + else + transport->tcp_flags &= ~TCP_RPC_REPLY; + dprintk("RPC: reading %s CALL/REPLY flag %08x\n", + (transport->tcp_flags & TCP_RPC_REPLY) ? + "reply for" : "request with", calldir); + xs_tcp_check_fraghdr(transport); +} + +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; - /* Find and lock the request corresponding to this xid */ - spin_lock(&xprt->transport_lock); - req = xprt_lookup_rqst(xprt, transport->tcp_xid); - if (!req) { - transport->tcp_flags &= ~TCP_RCV_COPY_DATA; - dprintk("RPC: XID %08x request not found!\n", - ntohl(transport->tcp_xid)); - spin_unlock(&xprt->transport_lock); - return; + rcvbuf = &req->rq_private_buf; + + if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { + /* + * Save the RPC direction in the XDR buffer + */ + __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ? + htonl(RPC_REPLY) : 0; + + memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, + &calldir, sizeof(calldir)); + transport->tcp_copied += sizeof(calldir); + transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; } - rcvbuf = &req->rq_private_buf; len = desc->count; if (len > transport->tcp_reclen - transport->tcp_offset) { struct xdr_skb_reader my_desc; @@ -1014,7 +1040,7 @@ static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_rea "tcp_offset = %u, tcp_reclen = %u\n", xprt, transport->tcp_copied, transport->tcp_offset, transport->tcp_reclen); - goto out; + return; } dprintk("RPC: XID %08x read %Zd bytes\n", @@ -1030,11 +1056,125 @@ static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_rea transport->tcp_flags &= ~TCP_RCV_COPY_DATA; } -out: + return; +} + +/* + * 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->transport_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->transport_lock); + return -1; + } + + xs_tcp_read_common(xprt, desc, req); + if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) xprt_complete_rqst(req->rq_task, transport->tcp_copied); + spin_unlock(&xprt->transport_lock); - xs_tcp_check_fraghdr(transport); + return 0; +} + +#if defined(CONFIG_NFS_V4_1) +/* + * 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 inline 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; + + req = xprt_alloc_bc_request(xprt); + if (req == NULL) { + printk(KERN_WARNING "Callback slot table overflowed\n"); + xprt_force_disconnect(xprt); + return -1; + } + + req->rq_xid = transport->tcp_xid; + 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)) { + struct svc_serv *bc_serv = xprt->bc_serv; + + /* + * Add callback request to callback list. The callback + * service sleeps on the sv_cb_waitq waiting for new + * requests. Wake it up after adding enqueing the + * request. + */ + dprintk("RPC: add callback request to list\n"); + spin_lock(&bc_serv->sv_cb_lock); + list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); + spin_unlock(&bc_serv->sv_cb_lock); + wake_up(&bc_serv->sv_cb_waitq); + } + + req->rq_private_buf.len = transport->tcp_copied; + + return 0; +} + +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); +} +#else +static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, + struct xdr_skb_reader *desc) +{ + return xs_tcp_read_reply(xprt, desc); +} +#endif /* CONFIG_NFS_V4_1 */ + +/* + * 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; + } } static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) @@ -1074,9 +1214,14 @@ static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, uns 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_request(xprt, &desc); + xs_tcp_read_data(xprt, &desc); continue; } /* Skip over any trailing bytes on short reads */ @@ -1106,6 +1251,12 @@ static void xs_tcp_data_ready(struct sock *sk, int bytes) if (xprt->shutdown) goto out; + /* Any data means we had a useful conversation, so + * the we don't need to delay the next reconnect + */ + if (xprt->reestablish_timeout) + xprt->reestablish_timeout = 0; + /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ rd_desc.arg.data = xprt; do { @@ -1116,6 +1267,47 @@ out: read_unlock(&sk->sk_callback_lock); } +/* + * Do the equivalent of linger/linger2 handling for dealing with + * broken servers that don't close the socket in a timely + * fashion + */ +static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, + unsigned long timeout) +{ + struct sock_xprt *transport; + + if (xprt_test_and_set_connecting(xprt)) + return; + set_bit(XPRT_CONNECTION_ABORT, &xprt->state); + transport = container_of(xprt, struct sock_xprt, xprt); + queue_delayed_work(rpciod_workqueue, &transport->connect_worker, + timeout); +} + +static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) +{ + struct sock_xprt *transport; + + transport = container_of(xprt, struct sock_xprt, xprt); + + if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || + !cancel_delayed_work(&transport->connect_worker)) + return; + clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); + xprt_clear_connecting(xprt); +} + +static void xs_sock_mark_closed(struct rpc_xprt *xprt) +{ + smp_mb__before_clear_bit(); + clear_bit(XPRT_CLOSE_WAIT, &xprt->state); + clear_bit(XPRT_CLOSING, &xprt->state); + smp_mb__after_clear_bit(); + /* Mark transport as closed and wake up all pending tasks */ + xprt_disconnect_done(xprt); +} + /** * xs_tcp_state_change - callback to handle TCP socket state changes * @sk: socket whose state has changed @@ -1148,7 +1340,7 @@ static void xs_tcp_state_change(struct sock *sk) transport->tcp_flags = TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; - xprt_wake_pending_tasks(xprt, 0); + xprt_wake_pending_tasks(xprt, -EAGAIN); } spin_unlock_bh(&xprt->transport_lock); break; @@ -1161,10 +1353,10 @@ static void xs_tcp_state_change(struct sock *sk) clear_bit(XPRT_CONNECTED, &xprt->state); clear_bit(XPRT_CLOSE_WAIT, &xprt->state); smp_mb__after_clear_bit(); + xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); break; case TCP_CLOSE_WAIT: /* The server initiated a shutdown of the socket */ - set_bit(XPRT_CLOSING, &xprt->state); xprt_force_disconnect(xprt); case TCP_SYN_SENT: xprt->connect_cookie++; @@ -1177,40 +1369,35 @@ static void xs_tcp_state_change(struct sock *sk) xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; break; case TCP_LAST_ACK: + set_bit(XPRT_CLOSING, &xprt->state); + xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); smp_mb__before_clear_bit(); clear_bit(XPRT_CONNECTED, &xprt->state); smp_mb__after_clear_bit(); break; case TCP_CLOSE: - smp_mb__before_clear_bit(); - clear_bit(XPRT_CLOSE_WAIT, &xprt->state); - clear_bit(XPRT_CLOSING, &xprt->state); - smp_mb__after_clear_bit(); - /* Mark transport as closed and wake up all pending tasks */ - xprt_disconnect_done(xprt); + xs_tcp_cancel_linger_timeout(xprt); + xs_sock_mark_closed(xprt); } out: read_unlock(&sk->sk_callback_lock); } /** - * xs_tcp_error_report - callback mainly for catching RST events + * xs_error_report - callback mainly for catching socket errors * @sk: socket */ -static void xs_tcp_error_report(struct sock *sk) +static void xs_error_report(struct sock *sk) { struct rpc_xprt *xprt; read_lock(&sk->sk_callback_lock); - if (sk->sk_err != ECONNRESET || sk->sk_state != TCP_ESTABLISHED) - goto out; if (!(xprt = xprt_from_sock(sk))) goto out; dprintk("RPC: %s client %p...\n" "RPC: error %d\n", __func__, xprt, sk->sk_err); - - xprt_force_disconnect(xprt); + xprt_wake_pending_tasks(xprt, -EAGAIN); out: read_unlock(&sk->sk_callback_lock); } @@ -1338,25 +1525,15 @@ static unsigned short xs_get_random_port(void) */ static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) { - struct sockaddr *addr = xs_addr(xprt); - dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); - switch (addr->sa_family) { - case AF_INET: - ((struct sockaddr_in *)addr)->sin_port = htons(port); - break; - case AF_INET6: - ((struct sockaddr_in6 *)addr)->sin6_port = htons(port); - break; - default: - BUG(); - } + rpc_set_port(xs_addr(xprt), port); + xs_update_peer_port(xprt); } static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) { - unsigned short port = transport->port; + unsigned short port = transport->srcport; if (port == 0 && transport->xprt.resvport) port = xs_get_random_port(); @@ -1365,8 +1542,8 @@ static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) { - if (transport->port != 0) - transport->port = 0; + if (transport->srcport != 0) + transport->srcport = 0; if (!transport->xprt.resvport) return 0; if (port <= xprt_min_resvport || port > xprt_max_resvport) @@ -1384,7 +1561,7 @@ static int xs_bind4(struct sock_xprt *transport, struct socket *sock) unsigned short port = xs_get_srcport(transport, sock); unsigned short last; - sa = (struct sockaddr_in *)&transport->addr; + sa = (struct sockaddr_in *)&transport->srcaddr; myaddr.sin_addr = sa->sin_addr; do { myaddr.sin_port = htons(port); @@ -1393,7 +1570,7 @@ static int xs_bind4(struct sock_xprt *transport, struct socket *sock) if (port == 0) break; if (err == 0) { - transport->port = port; + transport->srcport = port; break; } last = port; @@ -1417,7 +1594,7 @@ static int xs_bind6(struct sock_xprt *transport, struct socket *sock) unsigned short port = xs_get_srcport(transport, sock); unsigned short last; - sa = (struct sockaddr_in6 *)&transport->addr; + sa = (struct sockaddr_in6 *)&transport->srcaddr; myaddr.sin6_addr = sa->sin6_addr; do { myaddr.sin6_port = htons(port); @@ -1426,7 +1603,7 @@ static int xs_bind6(struct sock_xprt *transport, struct socket *sock) if (port == 0) break; if (err == 0) { - transport->port = port; + transport->srcport = port; break; } last = port; @@ -1484,6 +1661,7 @@ static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) sk->sk_user_data = xprt; sk->sk_data_ready = xs_udp_data_ready; sk->sk_write_space = xs_udp_write_space; + sk->sk_error_report = xs_error_report; sk->sk_no_check = UDP_CSUM_NORCV; sk->sk_allocation = GFP_ATOMIC; @@ -1512,13 +1690,14 @@ static void xs_udp_connect_worker4(struct work_struct *work) struct socket *sock = transport->sock; int err, status = -EIO; - if (xprt->shutdown || !xprt_bound(xprt)) + if (xprt->shutdown) goto out; /* Start by resetting any existing state */ - xs_close(xprt); + xs_reset_transport(transport); - if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { + err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); + if (err < 0) { dprintk("RPC: can't create UDP transport socket (%d).\n", -err); goto out; } @@ -1529,14 +1708,17 @@ static void xs_udp_connect_worker4(struct work_struct *work) goto out; } - dprintk("RPC: worker connecting xprt %p to address: %s\n", - xprt, xprt->address_strings[RPC_DISPLAY_ALL]); + 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); status = 0; out: - xprt_wake_pending_tasks(xprt, status); xprt_clear_connecting(xprt); + xprt_wake_pending_tasks(xprt, status); } /** @@ -1553,13 +1735,14 @@ static void xs_udp_connect_worker6(struct work_struct *work) struct socket *sock = transport->sock; int err, status = -EIO; - if (xprt->shutdown || !xprt_bound(xprt)) + if (xprt->shutdown) goto out; /* Start by resetting any existing state */ - xs_close(xprt); + xs_reset_transport(transport); - if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { + err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock); + if (err < 0) { dprintk("RPC: can't create UDP transport socket (%d).\n", -err); goto out; } @@ -1570,24 +1753,26 @@ static void xs_udp_connect_worker6(struct work_struct *work) goto out; } - dprintk("RPC: worker connecting xprt %p to address: %s\n", - xprt, xprt->address_strings[RPC_DISPLAY_ALL]); + 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); status = 0; out: - xprt_wake_pending_tasks(xprt, status); xprt_clear_connecting(xprt); + xprt_wake_pending_tasks(xprt, status); } /* * We need to preserve the port number so the reply cache on the server can * find our cached RPC replies when we get around to reconnecting. */ -static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) +static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) { int result; - struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); struct sockaddr any; dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); @@ -1599,11 +1784,24 @@ static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) memset(&any, 0, sizeof(any)); any.sa_family = AF_UNSPEC; result = kernel_connect(transport->sock, &any, sizeof(any), 0); - if (result) + if (!result) + xs_sock_mark_closed(xprt); + else dprintk("RPC: AF_UNSPEC connect return code %d\n", result); } +static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) +{ + unsigned int state = transport->inet->sk_state; + + if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) + return; + if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) + return; + xs_abort_connection(xprt, transport); +} + static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) { struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); @@ -1619,7 +1817,7 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) sk->sk_data_ready = xs_tcp_data_ready; sk->sk_state_change = xs_tcp_state_change; sk->sk_write_space = xs_tcp_write_space; - sk->sk_error_report = xs_tcp_error_report; + sk->sk_error_report = xs_error_report; sk->sk_allocation = GFP_ATOMIC; /* socket options */ @@ -1637,6 +1835,9 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) write_unlock_bh(&sk->sk_callback_lock); } + if (!xprt_bound(xprt)) + return -ENOTCONN; + /* Tell the socket layer to start connecting... */ xprt->stat.connect_count++; xprt->stat.connect_start = jiffies; @@ -1644,122 +1845,157 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) } /** - * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint - * @work: RPC transport to connect + * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint + * @xprt: RPC transport to connect + * @transport: socket transport to connect + * @create_sock: function to create a socket of the correct type * * Invoked by a work queue tasklet. */ -static void xs_tcp_connect_worker4(struct work_struct *work) +static void xs_tcp_setup_socket(struct rpc_xprt *xprt, + struct sock_xprt *transport, + struct socket *(*create_sock)(struct rpc_xprt *, + struct sock_xprt *)) { - struct sock_xprt *transport = - container_of(work, struct sock_xprt, connect_worker.work); - struct rpc_xprt *xprt = &transport->xprt; struct socket *sock = transport->sock; - int err, status = -EIO; + int status = -EIO; - if (xprt->shutdown || !xprt_bound(xprt)) + if (xprt->shutdown) goto out; if (!sock) { - /* start from scratch */ - if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { - dprintk("RPC: can't create TCP transport socket (%d).\n", -err); + clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); + sock = create_sock(xprt, transport); + if (IS_ERR(sock)) { + status = PTR_ERR(sock); goto out; } - xs_reclassify_socket4(sock); + } else { + int abort_and_exit; - if (xs_bind4(transport, sock) < 0) { - sock_release(sock); - goto out; - } - } else + abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, + &xprt->state); /* "close" the socket, preserving the local port */ - xs_tcp_reuse_connection(xprt); + xs_tcp_reuse_connection(xprt, transport); - dprintk("RPC: worker connecting xprt %p to address: %s\n", - xprt, xprt->address_strings[RPC_DISPLAY_ALL]); + if (abort_and_exit) + goto out_eagain; + } + + 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); dprintk("RPC: %p connect status %d connected %d sock state %d\n", xprt, -status, xprt_connected(xprt), sock->sk->sk_state); - if (status < 0) { - switch (status) { - case -EINPROGRESS: - case -EALREADY: - goto out_clear; - case -ECONNREFUSED: - case -ECONNRESET: - /* retry with existing socket, after a delay */ - break; - default: - /* get rid of existing socket, and retry */ - xs_tcp_shutdown(xprt); - } + switch (status) { + default: + printk("%s: connect returned unhandled error %d\n", + __func__, status); + case -EADDRNOTAVAIL: + /* We're probably in TIME_WAIT. Get rid of existing socket, + * and retry + */ + set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); + xprt_force_disconnect(xprt); + break; + case -ECONNREFUSED: + case -ECONNRESET: + case -ENETUNREACH: + /* retry with existing socket, after a delay */ + case 0: + case -EINPROGRESS: + case -EALREADY: + xprt_clear_connecting(xprt); + return; } +out_eagain: + status = -EAGAIN; out: - xprt_wake_pending_tasks(xprt, status); -out_clear: xprt_clear_connecting(xprt); + xprt_wake_pending_tasks(xprt, status); +} + +static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt, + struct sock_xprt *transport) +{ + struct socket *sock; + int err; + + /* start from scratch */ + err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); + if (err < 0) { + dprintk("RPC: can't create TCP transport socket (%d).\n", + -err); + goto out_err; + } + xs_reclassify_socket4(sock); + + if (xs_bind4(transport, sock) < 0) { + sock_release(sock); + goto out_err; + } + return sock; +out_err: + return ERR_PTR(-EIO); } /** - * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint + * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint * @work: RPC transport to connect * * Invoked by a work queue tasklet. */ -static void xs_tcp_connect_worker6(struct work_struct *work) +static void xs_tcp_connect_worker4(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 = transport->sock; - int err, status = -EIO; - if (xprt->shutdown || !xprt_bound(xprt)) - goto out; + xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4); +} - if (!sock) { - /* start from scratch */ - if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { - dprintk("RPC: can't create TCP transport socket (%d).\n", -err); - goto out; - } - xs_reclassify_socket6(sock); +static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt, + struct sock_xprt *transport) +{ + struct socket *sock; + int err; + + /* start from scratch */ + err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock); + if (err < 0) { + dprintk("RPC: can't create TCP transport socket (%d).\n", + -err); + goto out_err; + } + xs_reclassify_socket6(sock); - if (xs_bind6(transport, sock) < 0) { - sock_release(sock); - goto out; - } - } else - /* "close" the socket, preserving the local port */ - xs_tcp_reuse_connection(xprt); + if (xs_bind6(transport, sock) < 0) { + sock_release(sock); + goto out_err; + } + return sock; +out_err: + return ERR_PTR(-EIO); +} - dprintk("RPC: worker connecting xprt %p to address: %s\n", - xprt, xprt->address_strings[RPC_DISPLAY_ALL]); +/** + * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint + * @work: RPC transport to connect + * + * Invoked by a work queue tasklet. + */ +static void xs_tcp_connect_worker6(struct work_struct *work) +{ + struct sock_xprt *transport = + container_of(work, struct sock_xprt, connect_worker.work); + struct rpc_xprt *xprt = &transport->xprt; - status = xs_tcp_finish_connecting(xprt, sock); - dprintk("RPC: %p connect status %d connected %d sock state %d\n", - xprt, -status, xprt_connected(xprt), sock->sk->sk_state); - if (status < 0) { - switch (status) { - case -EINPROGRESS: - case -EALREADY: - goto out_clear; - case -ECONNREFUSED: - case -ECONNRESET: - /* retry with existing socket, after a delay */ - break; - default: - /* get rid of existing socket, and retry */ - xs_tcp_shutdown(xprt); - } - } -out: - xprt_wake_pending_tasks(xprt, status); -out_clear: - xprt_clear_connecting(xprt); + xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6); } /** @@ -1783,7 +2019,7 @@ static void xs_connect(struct rpc_task *task) if (xprt_test_and_set_connecting(xprt)) return; - if (transport->sock != NULL) { + if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { dprintk("RPC: xs_connect delayed xprt %p for %lu " "seconds\n", xprt, xprt->reestablish_timeout / HZ); @@ -1791,6 +2027,8 @@ static void xs_connect(struct rpc_task *task) &transport->connect_worker, xprt->reestablish_timeout); xprt->reestablish_timeout <<= 1; + if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) + xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; } else { @@ -1804,9 +2042,6 @@ static void xs_tcp_connect(struct rpc_task *task) { struct rpc_xprt *xprt = task->tk_xprt; - /* Initiate graceful shutdown of the socket if not already done */ - if (test_bit(XPRT_CONNECTED, &xprt->state)) - xs_tcp_shutdown(xprt); /* Exit if we need to wait for socket shutdown to complete */ if (test_bit(XPRT_CLOSING, &xprt->state)) return; @@ -1824,7 +2059,7 @@ 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 %Lu %Lu\n", - transport->port, + transport->srcport, xprt->stat.bind_count, xprt->stat.sends, xprt->stat.recvs, @@ -1848,7 +2083,7 @@ static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) idle_time = (long)(jiffies - xprt->last_used) / HZ; seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", - transport->port, + transport->srcport, xprt->stat.bind_count, xprt->stat.connect_count, xprt->stat.connect_time, @@ -1860,6 +2095,134 @@ static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) xprt->stat.bklog_u); } +/* + * 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. + */ +void *bc_malloc(struct rpc_task *task, size_t size) +{ + struct page *page; + struct rpc_buffer *buf; + + BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); + page = alloc_page(GFP_KERNEL); + + if (!page) + return NULL; + + buf = page_address(page); + buf->len = PAGE_SIZE; + + return buf->data; +} + +/* + * Free the space allocated in the bc_alloc routine + */ +void bc_free(void *buffer) +{ + struct rpc_buffer *buf; + + if (!buffer) + return; + + buf = container_of(buffer, struct rpc_buffer, data); + free_page((unsigned long)buf); +} + +/* + * 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; + + /* + * Set up the rpc header and record marker stuff + */ + xs_encode_tcp_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; +} + +/* + * 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; + struct svc_sock *svsk; + u32 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; + svsk = container_of(xprt, struct svc_sock, sk_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; +} + +/* + * The close routine. Since this is client initiated, we do nothing + */ + +static void bc_close(struct rpc_xprt *xprt) +{ + return; +} + +/* + * The xprt destroy routine. Again, because this connection is client + * initiated, we do nothing + */ + +static void bc_destroy(struct rpc_xprt *xprt) +{ + return; +} + static struct rpc_xprt_ops xs_udp_ops = { .set_buffer_size = xs_udp_set_buffer_size, .reserve_xprt = xprt_reserve_xprt_cong, @@ -1888,11 +2251,30 @@ static struct rpc_xprt_ops xs_tcp_ops = { .buf_free = rpc_free, .send_request = xs_tcp_send_request, .set_retrans_timeout = xprt_set_retrans_timeout_def, - .close = xs_tcp_shutdown, +#if defined(CONFIG_NFS_V4_1) + .release_request = bc_release_request, +#endif /* CONFIG_NFS_V4_1 */ + .close = xs_tcp_close, .destroy = xs_destroy, .print_stats = xs_tcp_print_stats, }; +/* + * The rpc_xprt_ops for the server backchannel + */ + +static struct rpc_xprt_ops bc_tcp_ops = { + .reserve_xprt = xprt_reserve_xprt, + .release_xprt = xprt_release_xprt, + .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, +}; + static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, unsigned int slot_table_size) { @@ -1924,7 +2306,7 @@ static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, memcpy(&xprt->addr, args->dstaddr, args->addrlen); xprt->addrlen = args->addrlen; if (args->srcaddr) - memcpy(&new->addr, args->srcaddr, args->addrlen); + memcpy(&new->srcaddr, args->srcaddr, args->addrlen); return xprt; } @@ -1973,7 +2355,7 @@ static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_connect_worker4); - xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); + xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); break; case AF_INET6: if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) @@ -1981,15 +2363,22 @@ static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_connect_worker6); - xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); + xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); break; default: kfree(xprt); return ERR_PTR(-EAFNOSUPPORT); } - dprintk("RPC: set up transport to address %s\n", - xprt->address_strings[RPC_DISPLAY_ALL]); + 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; @@ -2038,23 +2427,33 @@ static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) if (((struct sockaddr_in *)addr)->sin_port != htons(0)) xprt_set_bound(xprt); - INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4); - xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); + INIT_DELAYED_WORK(&transport->connect_worker, + xs_tcp_connect_worker4); + 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); - INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6); - xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); + INIT_DELAYED_WORK(&transport->connect_worker, + xs_tcp_connect_worker6); + xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); break; default: kfree(xprt); return ERR_PTR(-EAFNOSUPPORT); } - dprintk("RPC: set up transport to address %s\n", - xprt->address_strings[RPC_DISPLAY_ALL]); + 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; @@ -2064,11 +2463,93 @@ static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) return ERR_PTR(-EINVAL); } +/** + * 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; + + if (!args->bc_xprt) + ERR_PTR(-EINVAL); + + xprt = xs_setup_xprt(args, 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->connect_timeout = 0; + xprt->reestablish_timeout = 0; + xprt->idle_timeout = 0; + + /* + * The backchannel uses the same socket connection as the + * forechannel + */ + xprt->bc_xprt = args->bc_xprt; + bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); + bc_sock->sk_bc_xprt = xprt; + transport->sock = bc_sock->sk_sock; + transport->inet = bc_sock->sk_sk; + + 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: + kfree(xprt); + return ERR_PTR(-EAFNOSUPPORT); + } + + 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]); + + /* + * 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; + kfree(xprt->slot); + kfree(xprt); + return ERR_PTR(-EINVAL); +} + static struct xprt_class xs_udp_transport = { .list = LIST_HEAD_INIT(xs_udp_transport.list), .name = "udp", .owner = THIS_MODULE, - .ident = IPPROTO_UDP, + .ident = XPRT_TRANSPORT_UDP, .setup = xs_setup_udp, }; @@ -2076,10 +2557,18 @@ static struct xprt_class xs_tcp_transport = { .list = LIST_HEAD_INIT(xs_tcp_transport.list), .name = "tcp", .owner = THIS_MODULE, - .ident = IPPROTO_TCP, + .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 * @@ -2093,6 +2582,7 @@ int init_socket_xprt(void) xprt_register_transport(&xs_udp_transport); xprt_register_transport(&xs_tcp_transport); + xprt_register_transport(&xs_bc_tcp_transport); return 0; } @@ -2112,4 +2602,57 @@ void cleanup_socket_xprt(void) xprt_unregister_transport(&xs_udp_transport); xprt_unregister_transport(&xs_tcp_transport); + xprt_unregister_transport(&xs_bc_tcp_transport); +} + +static int param_set_uint_minmax(const char *val, struct kernel_param *kp, + unsigned int min, unsigned int max) +{ + unsigned long num; + int ret; + + if (!val) + return -EINVAL; + ret = strict_strtoul(val, 0, &num); + if (ret == -EINVAL || num < min || num > max) + return -EINVAL; + *((unsigned int *)kp->arg) = num; + return 0; } + +static int param_set_portnr(const char *val, struct kernel_param *kp) +{ + return param_set_uint_minmax(val, kp, + RPC_MIN_RESVPORT, + RPC_MAX_RESVPORT); +} + +static int param_get_portnr(char *buffer, struct kernel_param *kp) +{ + return param_get_uint(buffer, kp); +} +#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, struct kernel_param *kp) +{ + return param_set_uint_minmax(val, kp, + RPC_MIN_SLOT_TABLE, + RPC_MAX_SLOT_TABLE); +} + +static int param_get_slot_table_size(char *buffer, struct kernel_param *kp) +{ + return param_get_uint(buffer, kp); +} +#define param_check_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(udp_slot_table_entries, xprt_udp_slot_table_entries, + slot_table_size, 0644); +