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0b4d414714
The semantic effect of insert_at_head is that it would allow new registered sysctl entries to override existing sysctl entries of the same name. Which is pain for caching and the proc interface never implemented. I have done an audit and discovered that none of the current users of register_sysctl care as (excpet for directories) they do not register duplicate sysctl entries. So this patch simply removes the support for overriding existing entries in the sys_sysctl interface since no one uses it or cares and it makes future enhancments harder. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: David Howells <dhowells@redhat.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Andi Kleen <ak@muc.de> Cc: Jens Axboe <axboe@kernel.dk> Cc: Corey Minyard <minyard@acm.org> Cc: Neil Brown <neilb@suse.de> Cc: "John W. Linville" <linville@tuxdriver.com> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Jan Kara <jack@ucw.cz> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Mark Fasheh <mark.fasheh@oracle.com> Cc: David Chinner <dgc@sgi.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Patrick McHardy <kaber@trash.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1658 lines
43 KiB
C
1658 lines
43 KiB
C
/*
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* linux/net/sunrpc/xprtsock.c
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*
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* Client-side transport implementation for sockets.
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*
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* TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com>
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* TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
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* TCP NFS related read + write fixes
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* (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
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*
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* Rewrite of larges part of the code in order to stabilize TCP stuff.
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* Fix behaviour when socket buffer is full.
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* (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
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*
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* IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/capability.h>
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#include <linux/pagemap.h>
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#include <linux/errno.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/net.h>
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#include <linux/mm.h>
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#include <linux/udp.h>
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#include <linux/tcp.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/file.h>
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#include <net/sock.h>
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#include <net/checksum.h>
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#include <net/udp.h>
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#include <net/tcp.h>
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/*
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* xprtsock tunables
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*/
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unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
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unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
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unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
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unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
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/*
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* We can register our own files under /proc/sys/sunrpc by
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* calling register_sysctl_table() again. The files in that
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* directory become the union of all files registered there.
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*
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* We simply need to make sure that we don't collide with
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* someone else's file names!
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*/
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#ifdef RPC_DEBUG
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static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
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static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
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static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
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static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
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static struct ctl_table_header *sunrpc_table_header;
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/*
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* FIXME: changing the UDP slot table size should also resize the UDP
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* socket buffers for existing UDP transports
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*/
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static ctl_table xs_tunables_table[] = {
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{
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.ctl_name = CTL_SLOTTABLE_UDP,
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.procname = "udp_slot_table_entries",
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.data = &xprt_udp_slot_table_entries,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.strategy = &sysctl_intvec,
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.extra1 = &min_slot_table_size,
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.extra2 = &max_slot_table_size
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},
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{
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.ctl_name = CTL_SLOTTABLE_TCP,
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.procname = "tcp_slot_table_entries",
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.data = &xprt_tcp_slot_table_entries,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.strategy = &sysctl_intvec,
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.extra1 = &min_slot_table_size,
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.extra2 = &max_slot_table_size
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},
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{
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.ctl_name = CTL_MIN_RESVPORT,
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.procname = "min_resvport",
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.data = &xprt_min_resvport,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.strategy = &sysctl_intvec,
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.extra1 = &xprt_min_resvport_limit,
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.extra2 = &xprt_max_resvport_limit
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},
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{
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.ctl_name = CTL_MAX_RESVPORT,
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.procname = "max_resvport",
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.data = &xprt_max_resvport,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.strategy = &sysctl_intvec,
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.extra1 = &xprt_min_resvport_limit,
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.extra2 = &xprt_max_resvport_limit
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},
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{
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.ctl_name = 0,
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},
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};
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static ctl_table sunrpc_table[] = {
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{
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.ctl_name = CTL_SUNRPC,
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.procname = "sunrpc",
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.mode = 0555,
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.child = xs_tunables_table
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},
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{
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.ctl_name = 0,
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},
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};
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#endif
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/*
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* How many times to try sending a request on a socket before waiting
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* for the socket buffer to clear.
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*/
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#define XS_SENDMSG_RETRY (10U)
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/*
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* Time out for an RPC UDP socket connect. UDP socket connects are
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* synchronous, but we set a timeout anyway in case of resource
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* exhaustion on the local host.
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*/
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#define XS_UDP_CONN_TO (5U * HZ)
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/*
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* Wait duration for an RPC TCP connection to be established. Solaris
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* NFS over TCP uses 60 seconds, for example, which is in line with how
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* long a server takes to reboot.
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*/
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#define XS_TCP_CONN_TO (60U * HZ)
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/*
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* Wait duration for a reply from the RPC portmapper.
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*/
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#define XS_BIND_TO (60U * HZ)
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/*
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* Delay if a UDP socket connect error occurs. This is most likely some
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* kind of resource problem on the local host.
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*/
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#define XS_UDP_REEST_TO (2U * HZ)
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/*
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* The reestablish timeout allows clients to delay for a bit before attempting
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* to reconnect to a server that just dropped our connection.
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*
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* We implement an exponential backoff when trying to reestablish a TCP
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* transport connection with the server. Some servers like to drop a TCP
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* connection when they are overworked, so we start with a short timeout and
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* increase over time if the server is down or not responding.
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*/
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#define XS_TCP_INIT_REEST_TO (3U * HZ)
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#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
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/*
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* TCP idle timeout; client drops the transport socket if it is idle
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* for this long. Note that we also timeout UDP sockets to prevent
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* holding port numbers when there is no RPC traffic.
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*/
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#define XS_IDLE_DISC_TO (5U * 60 * HZ)
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#ifdef RPC_DEBUG
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# undef RPC_DEBUG_DATA
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# define RPCDBG_FACILITY RPCDBG_TRANS
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#endif
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#ifdef RPC_DEBUG_DATA
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static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
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{
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u8 *buf = (u8 *) packet;
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int j;
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dprintk("RPC: %s\n", msg);
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for (j = 0; j < count && j < 128; j += 4) {
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if (!(j & 31)) {
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if (j)
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dprintk("\n");
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dprintk("0x%04x ", j);
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}
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dprintk("%02x%02x%02x%02x ",
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buf[j], buf[j+1], buf[j+2], buf[j+3]);
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}
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dprintk("\n");
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}
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#else
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static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
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{
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/* NOP */
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}
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#endif
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struct sock_xprt {
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struct rpc_xprt xprt;
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/*
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* Network layer
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*/
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struct socket * sock;
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struct sock * inet;
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/*
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* State of TCP reply receive
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*/
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__be32 tcp_fraghdr,
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tcp_xid;
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u32 tcp_offset,
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tcp_reclen;
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unsigned long tcp_copied,
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tcp_flags;
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/*
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* Connection of transports
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*/
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struct delayed_work connect_worker;
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unsigned short port;
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/*
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* UDP socket buffer size parameters
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*/
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size_t rcvsize,
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sndsize;
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/*
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* Saved socket callback addresses
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*/
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void (*old_data_ready)(struct sock *, int);
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void (*old_state_change)(struct sock *);
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void (*old_write_space)(struct sock *);
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};
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/*
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* TCP receive state flags
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*/
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#define TCP_RCV_LAST_FRAG (1UL << 0)
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#define TCP_RCV_COPY_FRAGHDR (1UL << 1)
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#define TCP_RCV_COPY_XID (1UL << 2)
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#define TCP_RCV_COPY_DATA (1UL << 3)
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static void xs_format_peer_addresses(struct rpc_xprt *xprt)
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{
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struct sockaddr_in *addr = (struct sockaddr_in *) &xprt->addr;
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char *buf;
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buf = kzalloc(20, GFP_KERNEL);
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if (buf) {
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snprintf(buf, 20, "%u.%u.%u.%u",
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NIPQUAD(addr->sin_addr.s_addr));
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}
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xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
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buf = kzalloc(8, GFP_KERNEL);
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if (buf) {
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snprintf(buf, 8, "%u",
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ntohs(addr->sin_port));
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}
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xprt->address_strings[RPC_DISPLAY_PORT] = buf;
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if (xprt->prot == IPPROTO_UDP)
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xprt->address_strings[RPC_DISPLAY_PROTO] = "udp";
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else
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xprt->address_strings[RPC_DISPLAY_PROTO] = "tcp";
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buf = kzalloc(48, GFP_KERNEL);
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if (buf) {
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snprintf(buf, 48, "addr=%u.%u.%u.%u port=%u proto=%s",
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NIPQUAD(addr->sin_addr.s_addr),
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ntohs(addr->sin_port),
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xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
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}
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xprt->address_strings[RPC_DISPLAY_ALL] = buf;
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}
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static void xs_free_peer_addresses(struct rpc_xprt *xprt)
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{
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kfree(xprt->address_strings[RPC_DISPLAY_ADDR]);
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kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
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kfree(xprt->address_strings[RPC_DISPLAY_ALL]);
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}
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#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
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static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
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{
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struct msghdr msg = {
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.msg_name = addr,
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.msg_namelen = addrlen,
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.msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
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};
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struct kvec iov = {
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.iov_base = vec->iov_base + base,
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.iov_len = vec->iov_len - base,
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};
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if (iov.iov_len != 0)
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return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
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return kernel_sendmsg(sock, &msg, NULL, 0, 0);
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}
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static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
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{
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struct page **ppage;
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unsigned int remainder;
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int err, sent = 0;
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remainder = xdr->page_len - base;
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base += xdr->page_base;
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ppage = xdr->pages + (base >> PAGE_SHIFT);
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base &= ~PAGE_MASK;
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for(;;) {
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unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
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int flags = XS_SENDMSG_FLAGS;
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remainder -= len;
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if (remainder != 0 || more)
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flags |= MSG_MORE;
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err = sock->ops->sendpage(sock, *ppage, base, len, flags);
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if (remainder == 0 || err != len)
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break;
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sent += err;
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ppage++;
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base = 0;
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}
|
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if (sent == 0)
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return err;
|
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if (err > 0)
|
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sent += err;
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return sent;
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}
|
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|
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/**
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* xs_sendpages - write pages directly to a socket
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* @sock: socket to send on
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* @addr: UDP only -- address of destination
|
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* @addrlen: UDP only -- length of destination address
|
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* @xdr: buffer containing this request
|
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* @base: starting position in the buffer
|
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*
|
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*/
|
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static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
|
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{
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unsigned int remainder = xdr->len - base;
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int err, sent = 0;
|
|
|
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if (unlikely(!sock))
|
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return -ENOTCONN;
|
|
|
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clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
|
|
if (base != 0) {
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addr = NULL;
|
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addrlen = 0;
|
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}
|
|
|
|
if (base < xdr->head[0].iov_len || addr != NULL) {
|
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unsigned int len = xdr->head[0].iov_len - base;
|
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remainder -= len;
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err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
|
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if (remainder == 0 || err != len)
|
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goto out;
|
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sent += err;
|
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base = 0;
|
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} else
|
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base -= xdr->head[0].iov_len;
|
|
|
|
if (base < xdr->page_len) {
|
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unsigned int len = xdr->page_len - base;
|
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remainder -= len;
|
|
err = xs_send_pagedata(sock, xdr, base, remainder != 0);
|
|
if (remainder == 0 || err != len)
|
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goto out;
|
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sent += err;
|
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base = 0;
|
|
} else
|
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base -= xdr->page_len;
|
|
|
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if (base >= xdr->tail[0].iov_len)
|
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return sent;
|
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err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
|
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out:
|
|
if (sent == 0)
|
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return err;
|
|
if (err > 0)
|
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sent += err;
|
|
return sent;
|
|
}
|
|
|
|
/**
|
|
* xs_nospace - place task on wait queue if transmit was incomplete
|
|
* @task: task to put to sleep
|
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*
|
|
*/
|
|
static void 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);
|
|
|
|
dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
|
|
task->tk_pid, req->rq_slen - req->rq_bytes_sent,
|
|
req->rq_slen);
|
|
|
|
if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
|
|
/* Protect against races with write_space */
|
|
spin_lock_bh(&xprt->transport_lock);
|
|
|
|
/* Don't race with disconnect */
|
|
if (!xprt_connected(xprt))
|
|
task->tk_status = -ENOTCONN;
|
|
else if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
|
|
xprt_wait_for_buffer_space(task);
|
|
|
|
spin_unlock_bh(&xprt->transport_lock);
|
|
} else
|
|
/* Keep holding the socket if it is blocked */
|
|
rpc_delay(task, HZ>>4);
|
|
}
|
|
|
|
/**
|
|
* 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 occured, 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 status;
|
|
|
|
xs_pktdump("packet data:",
|
|
req->rq_svec->iov_base,
|
|
req->rq_svec->iov_len);
|
|
|
|
req->rq_xtime = jiffies;
|
|
status = xs_sendpages(transport->sock,
|
|
(struct sockaddr *) &xprt->addr,
|
|
xprt->addrlen, xdr,
|
|
req->rq_bytes_sent);
|
|
|
|
dprintk("RPC: xs_udp_send_request(%u) = %d\n",
|
|
xdr->len - req->rq_bytes_sent, status);
|
|
|
|
if (likely(status >= (int) req->rq_slen))
|
|
return 0;
|
|
|
|
/* Still some bytes left; set up for a retry later. */
|
|
if (status > 0)
|
|
status = -EAGAIN;
|
|
|
|
switch (status) {
|
|
case -ENETUNREACH:
|
|
case -EPIPE:
|
|
case -ECONNREFUSED:
|
|
/* When the server has died, an ICMP port unreachable message
|
|
* prompts ECONNREFUSED. */
|
|
break;
|
|
case -EAGAIN:
|
|
xs_nospace(task);
|
|
break;
|
|
default:
|
|
dprintk("RPC: sendmsg returned unrecognized error %d\n",
|
|
-status);
|
|
break;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
|
|
{
|
|
u32 reclen = buf->len - sizeof(rpc_fraghdr);
|
|
rpc_fraghdr *base = buf->head[0].iov_base;
|
|
*base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
|
|
}
|
|
|
|
/**
|
|
* 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 occured, 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;
|
|
int status, retry = 0;
|
|
|
|
xs_encode_tcp_record_marker(&req->rq_snd_buf);
|
|
|
|
xs_pktdump("packet data:",
|
|
req->rq_svec->iov_base,
|
|
req->rq_svec->iov_len);
|
|
|
|
/* Continue transmitting the packet/record. We must be careful
|
|
* to cope with writespace callbacks arriving _after_ we have
|
|
* called sendmsg(). */
|
|
while (1) {
|
|
req->rq_xtime = jiffies;
|
|
status = xs_sendpages(transport->sock,
|
|
NULL, 0, xdr, req->rq_bytes_sent);
|
|
|
|
dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
|
|
xdr->len - req->rq_bytes_sent, status);
|
|
|
|
if (unlikely(status < 0))
|
|
break;
|
|
|
|
/* If we've sent the entire packet, immediately
|
|
* reset the count of bytes sent. */
|
|
req->rq_bytes_sent += status;
|
|
task->tk_bytes_sent += status;
|
|
if (likely(req->rq_bytes_sent >= req->rq_slen)) {
|
|
req->rq_bytes_sent = 0;
|
|
return 0;
|
|
}
|
|
|
|
status = -EAGAIN;
|
|
if (retry++ > XS_SENDMSG_RETRY)
|
|
break;
|
|
}
|
|
|
|
switch (status) {
|
|
case -EAGAIN:
|
|
xs_nospace(task);
|
|
break;
|
|
case -ECONNREFUSED:
|
|
case -ECONNRESET:
|
|
case -ENOTCONN:
|
|
case -EPIPE:
|
|
status = -ENOTCONN;
|
|
break;
|
|
default:
|
|
dprintk("RPC: sendmsg returned unrecognized error %d\n",
|
|
-status);
|
|
xprt_disconnect(xprt);
|
|
break;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* 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->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, &task->tk_xprt->state);
|
|
out_release:
|
|
xprt_release_xprt(xprt, task);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
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);
|
|
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
transport->inet = NULL;
|
|
transport->sock = NULL;
|
|
|
|
sk->sk_user_data = NULL;
|
|
sk->sk_data_ready = transport->old_data_ready;
|
|
sk->sk_state_change = transport->old_state_change;
|
|
sk->sk_write_space = transport->old_write_space;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
|
|
sk->sk_no_check = 0;
|
|
|
|
sock_release(sock);
|
|
clear_close_wait:
|
|
smp_mb__before_clear_bit();
|
|
clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
|
|
smp_mb__after_clear_bit();
|
|
}
|
|
|
|
/**
|
|
* 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(&transport->connect_worker);
|
|
flush_scheduled_work();
|
|
|
|
xprt_disconnect(xprt);
|
|
xs_close(xprt);
|
|
xs_free_peer_addresses(xprt);
|
|
kfree(xprt->slot);
|
|
kfree(xprt);
|
|
}
|
|
|
|
static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
|
|
{
|
|
return (struct rpc_xprt *) sk->sk_user_data;
|
|
}
|
|
|
|
/**
|
|
* xs_udp_data_ready - "data ready" callback for UDP sockets
|
|
* @sk: socket with data to read
|
|
* @len: how much data to read
|
|
*
|
|
*/
|
|
static void xs_udp_data_ready(struct sock *sk, int len)
|
|
{
|
|
struct rpc_task *task;
|
|
struct rpc_xprt *xprt;
|
|
struct rpc_rqst *rovr;
|
|
struct sk_buff *skb;
|
|
int err, repsize, copied;
|
|
u32 _xid;
|
|
__be32 *xp;
|
|
|
|
read_lock(&sk->sk_callback_lock);
|
|
dprintk("RPC: xs_udp_data_ready...\n");
|
|
if (!(xprt = xprt_from_sock(sk)))
|
|
goto out;
|
|
|
|
if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
|
|
goto out;
|
|
|
|
if (xprt->shutdown)
|
|
goto dropit;
|
|
|
|
repsize = skb->len - sizeof(struct udphdr);
|
|
if (repsize < 4) {
|
|
dprintk("RPC: impossible RPC reply size %d!\n", repsize);
|
|
goto dropit;
|
|
}
|
|
|
|
/* Copy the XID from the skb... */
|
|
xp = skb_header_pointer(skb, sizeof(struct udphdr),
|
|
sizeof(_xid), &_xid);
|
|
if (xp == NULL)
|
|
goto dropit;
|
|
|
|
/* Look up and lock the request corresponding to the given XID */
|
|
spin_lock(&xprt->transport_lock);
|
|
rovr = xprt_lookup_rqst(xprt, *xp);
|
|
if (!rovr)
|
|
goto out_unlock;
|
|
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))
|
|
goto out_unlock;
|
|
|
|
/* Something worked... */
|
|
dst_confirm(skb->dst);
|
|
|
|
xprt_adjust_cwnd(task, copied);
|
|
xprt_update_rtt(task);
|
|
xprt_complete_rqst(task, copied);
|
|
|
|
out_unlock:
|
|
spin_unlock(&xprt->transport_lock);
|
|
dropit:
|
|
skb_free_datagram(sk, skb);
|
|
out:
|
|
read_unlock(&sk->sk_callback_lock);
|
|
}
|
|
|
|
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 < 4)) {
|
|
dprintk("RPC: invalid TCP record fragment length\n");
|
|
xprt_disconnect(xprt);
|
|
return;
|
|
}
|
|
dprintk("RPC: reading TCP record fragment of length %d\n",
|
|
transport->tcp_reclen);
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
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_COPY_DATA;
|
|
transport->tcp_copied = 4;
|
|
dprintk("RPC: reading reply for XID %08x\n",
|
|
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)
|
|
{
|
|
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
|
|
struct rpc_rqst *req;
|
|
struct xdr_buf *rcvbuf;
|
|
size_t len;
|
|
ssize_t r;
|
|
|
|
/* Find and lock the request corresponding to this xid */
|
|
spin_lock(&xprt->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;
|
|
len = desc->count;
|
|
if (len > transport->tcp_reclen - transport->tcp_offset) {
|
|
struct xdr_skb_reader my_desc;
|
|
|
|
len = transport->tcp_reclen - transport->tcp_offset;
|
|
memcpy(&my_desc, desc, sizeof(my_desc));
|
|
my_desc.count = len;
|
|
r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
|
|
&my_desc, xdr_skb_read_bits);
|
|
desc->count -= r;
|
|
desc->offset += r;
|
|
} else
|
|
r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
|
|
desc, xdr_skb_read_bits);
|
|
|
|
if (r > 0) {
|
|
transport->tcp_copied += r;
|
|
transport->tcp_offset += r;
|
|
}
|
|
if (r != len) {
|
|
/* Error when copying to the receive buffer,
|
|
* usually because we weren't able to allocate
|
|
* additional buffer pages. All we can do now
|
|
* is turn off 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);
|
|
goto out;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
out:
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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 {
|
|
/* 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 request data */
|
|
if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
|
|
xs_tcp_read_request(xprt, &desc);
|
|
continue;
|
|
}
|
|
/* Skip over any trailing bytes on short reads */
|
|
xs_tcp_read_discard(transport, &desc);
|
|
} while (desc.count);
|
|
dprintk("RPC: xs_tcp_data_recv done\n");
|
|
return len - desc.count;
|
|
}
|
|
|
|
/**
|
|
* xs_tcp_data_ready - "data ready" callback for TCP sockets
|
|
* @sk: socket with data to read
|
|
* @bytes: how much data to read
|
|
*
|
|
*/
|
|
static void xs_tcp_data_ready(struct sock *sk, int bytes)
|
|
{
|
|
struct rpc_xprt *xprt;
|
|
read_descriptor_t rd_desc;
|
|
|
|
dprintk("RPC: xs_tcp_data_ready...\n");
|
|
|
|
read_lock(&sk->sk_callback_lock);
|
|
if (!(xprt = xprt_from_sock(sk)))
|
|
goto out;
|
|
if (xprt->shutdown)
|
|
goto out;
|
|
|
|
/* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
|
|
rd_desc.arg.data = xprt;
|
|
rd_desc.count = 65536;
|
|
tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
|
|
out:
|
|
read_unlock(&sk->sk_callback_lock);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
read_lock(&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\n",
|
|
sk->sk_state, xprt_connected(xprt),
|
|
sock_flag(sk, SOCK_DEAD),
|
|
sock_flag(sk, SOCK_ZAPPED));
|
|
|
|
switch (sk->sk_state) {
|
|
case TCP_ESTABLISHED:
|
|
spin_lock_bh(&xprt->transport_lock);
|
|
if (!xprt_test_and_set_connected(xprt)) {
|
|
struct sock_xprt *transport = container_of(xprt,
|
|
struct sock_xprt, 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->reestablish_timeout = XS_TCP_INIT_REEST_TO;
|
|
xprt_wake_pending_tasks(xprt, 0);
|
|
}
|
|
spin_unlock_bh(&xprt->transport_lock);
|
|
break;
|
|
case TCP_SYN_SENT:
|
|
case TCP_SYN_RECV:
|
|
break;
|
|
case TCP_CLOSE_WAIT:
|
|
/* Try to schedule an autoclose RPC calls */
|
|
set_bit(XPRT_CLOSE_WAIT, &xprt->state);
|
|
if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
|
|
schedule_work(&xprt->task_cleanup);
|
|
default:
|
|
xprt_disconnect(xprt);
|
|
}
|
|
out:
|
|
read_unlock(&sk->sk_callback_lock);
|
|
}
|
|
|
|
/**
|
|
* 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(&sk->sk_callback_lock);
|
|
|
|
/* from net/core/sock.c:sock_def_write_space */
|
|
if (sock_writeable(sk)) {
|
|
struct socket *sock;
|
|
struct rpc_xprt *xprt;
|
|
|
|
if (unlikely(!(sock = sk->sk_socket)))
|
|
goto out;
|
|
if (unlikely(!(xprt = xprt_from_sock(sk))))
|
|
goto out;
|
|
if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
|
|
goto out;
|
|
|
|
xprt_write_space(xprt);
|
|
}
|
|
|
|
out:
|
|
read_unlock(&sk->sk_callback_lock);
|
|
}
|
|
|
|
/**
|
|
* 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(&sk->sk_callback_lock);
|
|
|
|
/* from net/core/stream.c:sk_stream_write_space */
|
|
if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
|
|
struct socket *sock;
|
|
struct rpc_xprt *xprt;
|
|
|
|
if (unlikely(!(sock = sk->sk_socket)))
|
|
goto out;
|
|
if (unlikely(!(xprt = xprt_from_sock(sk))))
|
|
goto out;
|
|
if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
|
|
goto out;
|
|
|
|
xprt_write_space(xprt);
|
|
}
|
|
|
|
out:
|
|
read_unlock(&sk->sk_callback_lock);
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* 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_task *task)
|
|
{
|
|
xprt_adjust_cwnd(task, -ETIMEDOUT);
|
|
}
|
|
|
|
static unsigned short xs_get_random_port(void)
|
|
{
|
|
unsigned short range = xprt_max_resvport - xprt_min_resvport;
|
|
unsigned short rand = (unsigned short) net_random() % range;
|
|
return rand + xprt_min_resvport;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct sockaddr_in *sap = (struct sockaddr_in *) &xprt->addr;
|
|
|
|
dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
|
|
|
|
sap->sin_port = htons(port);
|
|
}
|
|
|
|
static int xs_bindresvport(struct sock_xprt *transport, struct socket *sock)
|
|
{
|
|
struct sockaddr_in myaddr = {
|
|
.sin_family = AF_INET,
|
|
};
|
|
int err;
|
|
unsigned short port = transport->port;
|
|
|
|
do {
|
|
myaddr.sin_port = htons(port);
|
|
err = kernel_bind(sock, (struct sockaddr *) &myaddr,
|
|
sizeof(myaddr));
|
|
if (err == 0) {
|
|
transport->port = port;
|
|
dprintk("RPC: xs_bindresvport bound to port %u\n",
|
|
port);
|
|
return 0;
|
|
}
|
|
if (port <= xprt_min_resvport)
|
|
port = xprt_max_resvport;
|
|
else
|
|
port--;
|
|
} while (err == -EADDRINUSE && port != transport->port);
|
|
|
|
dprintk("RPC: can't bind to reserved port (%d).\n", -err);
|
|
return err;
|
|
}
|
|
|
|
#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_socket(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
BUG_ON(sk->sk_lock.owner != NULL);
|
|
switch (sk->sk_family) {
|
|
case AF_INET:
|
|
sock_lock_init_class_and_name(sk, "slock-AF_INET-NFS",
|
|
&xs_slock_key[0], "sk_lock-AF_INET-NFS", &xs_key[0]);
|
|
break;
|
|
|
|
case AF_INET6:
|
|
sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFS",
|
|
&xs_slock_key[1], "sk_lock-AF_INET6-NFS", &xs_key[1]);
|
|
break;
|
|
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
#else
|
|
static inline void xs_reclassify_socket(struct socket *sock)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* xs_udp_connect_worker - set up a UDP socket
|
|
* @work: RPC transport to connect
|
|
*
|
|
* Invoked by a work queue tasklet.
|
|
*/
|
|
static void xs_udp_connect_worker(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;
|
|
|
|
/* Start by resetting any existing state */
|
|
xs_close(xprt);
|
|
|
|
if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
|
|
dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
|
|
goto out;
|
|
}
|
|
xs_reclassify_socket(sock);
|
|
|
|
if (xprt->resvport && xs_bindresvport(transport, sock) < 0) {
|
|
sock_release(sock);
|
|
goto out;
|
|
}
|
|
|
|
dprintk("RPC: worker connecting xprt %p to address: %s\n",
|
|
xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
|
|
|
|
if (!transport->inet) {
|
|
struct sock *sk = sock->sk;
|
|
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
|
|
sk->sk_user_data = xprt;
|
|
transport->old_data_ready = sk->sk_data_ready;
|
|
transport->old_state_change = sk->sk_state_change;
|
|
transport->old_write_space = sk->sk_write_space;
|
|
sk->sk_data_ready = xs_udp_data_ready;
|
|
sk->sk_write_space = xs_udp_write_space;
|
|
sk->sk_no_check = UDP_CSUM_NORCV;
|
|
sk->sk_allocation = GFP_ATOMIC;
|
|
|
|
xprt_set_connected(xprt);
|
|
|
|
/* Reset to new socket */
|
|
transport->sock = sock;
|
|
transport->inet = sk;
|
|
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
xs_udp_do_set_buffer_size(xprt);
|
|
status = 0;
|
|
out:
|
|
xprt_wake_pending_tasks(xprt, status);
|
|
xprt_clear_connecting(xprt);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
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);
|
|
|
|
/*
|
|
* Disconnect the transport socket by doing a connect operation
|
|
* with AF_UNSPEC. This should return immediately...
|
|
*/
|
|
memset(&any, 0, sizeof(any));
|
|
any.sa_family = AF_UNSPEC;
|
|
result = kernel_connect(transport->sock, &any, sizeof(any), 0);
|
|
if (result)
|
|
dprintk("RPC: AF_UNSPEC connect return code %d\n",
|
|
result);
|
|
}
|
|
|
|
/**
|
|
* xs_tcp_connect_worker - connect a TCP socket to a remote endpoint
|
|
* @work: RPC transport to connect
|
|
*
|
|
* Invoked by a work queue tasklet.
|
|
*/
|
|
static void xs_tcp_connect_worker(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;
|
|
|
|
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);
|
|
goto out;
|
|
}
|
|
xs_reclassify_socket(sock);
|
|
|
|
if (xprt->resvport && xs_bindresvport(transport, sock) < 0) {
|
|
sock_release(sock);
|
|
goto out;
|
|
}
|
|
} else
|
|
/* "close" the socket, preserving the local port */
|
|
xs_tcp_reuse_connection(xprt);
|
|
|
|
dprintk("RPC: worker connecting xprt %p to address: %s\n",
|
|
xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
|
|
|
|
if (!transport->inet) {
|
|
struct sock *sk = sock->sk;
|
|
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
|
|
sk->sk_user_data = xprt;
|
|
transport->old_data_ready = sk->sk_data_ready;
|
|
transport->old_state_change = sk->sk_state_change;
|
|
transport->old_write_space = sk->sk_write_space;
|
|
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_allocation = GFP_ATOMIC;
|
|
|
|
/* socket options */
|
|
sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
|
|
sock_reset_flag(sk, SOCK_LINGER);
|
|
tcp_sk(sk)->linger2 = 0;
|
|
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);
|
|
}
|
|
|
|
/* Tell the socket layer to start connecting... */
|
|
xprt->stat.connect_count++;
|
|
xprt->stat.connect_start = jiffies;
|
|
status = kernel_connect(sock, (struct sockaddr *) &xprt->addr,
|
|
xprt->addrlen, O_NONBLOCK);
|
|
dprintk("RPC: %p connect status %d connected %d sock state %d\n",
|
|
xprt, -status, xprt_connected(xprt),
|
|
sock->sk->sk_state);
|
|
if (status < 0) {
|
|
switch (status) {
|
|
case -EINPROGRESS:
|
|
case -EALREADY:
|
|
goto out_clear;
|
|
case -ECONNREFUSED:
|
|
case -ECONNRESET:
|
|
/* retry with existing socket, after a delay */
|
|
break;
|
|
default:
|
|
/* get rid of existing socket, and retry */
|
|
xs_close(xprt);
|
|
break;
|
|
}
|
|
}
|
|
out:
|
|
xprt_wake_pending_tasks(xprt, status);
|
|
out_clear:
|
|
xprt_clear_connecting(xprt);
|
|
}
|
|
|
|
/**
|
|
* xs_connect - connect a socket to a remote endpoint
|
|
* @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_task *task)
|
|
{
|
|
struct rpc_xprt *xprt = task->tk_xprt;
|
|
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
|
|
|
|
if (xprt_test_and_set_connecting(xprt))
|
|
return;
|
|
|
|
if (transport->sock != NULL) {
|
|
dprintk("RPC: xs_connect delayed xprt %p for %lu "
|
|
"seconds\n",
|
|
xprt, xprt->reestablish_timeout / HZ);
|
|
schedule_delayed_work(&transport->connect_worker,
|
|
xprt->reestablish_timeout);
|
|
xprt->reestablish_timeout <<= 1;
|
|
if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
|
|
xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
|
|
} else {
|
|
dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
|
|
schedule_delayed_work(&transport->connect_worker, 0);
|
|
|
|
/* flush_scheduled_work can sleep... */
|
|
if (!RPC_IS_ASYNC(task))
|
|
flush_scheduled_work();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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 %Lu %Lu\n",
|
|
transport->port,
|
|
xprt->stat.bind_count,
|
|
xprt->stat.sends,
|
|
xprt->stat.recvs,
|
|
xprt->stat.bad_xids,
|
|
xprt->stat.req_u,
|
|
xprt->stat.bklog_u);
|
|
}
|
|
|
|
/**
|
|
* 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 %Lu %Lu\n",
|
|
transport->port,
|
|
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);
|
|
}
|
|
|
|
static 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,
|
|
.rpcbind = rpc_getport,
|
|
.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,
|
|
};
|
|
|
|
static struct rpc_xprt_ops xs_tcp_ops = {
|
|
.reserve_xprt = xprt_reserve_xprt,
|
|
.release_xprt = xs_tcp_release_xprt,
|
|
.rpcbind = rpc_getport,
|
|
.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_close,
|
|
.destroy = xs_destroy,
|
|
.print_stats = xs_tcp_print_stats,
|
|
};
|
|
|
|
static struct rpc_xprt *xs_setup_xprt(struct sockaddr *addr, size_t addrlen, unsigned int slot_table_size)
|
|
{
|
|
struct rpc_xprt *xprt;
|
|
struct sock_xprt *new;
|
|
|
|
if (addrlen > sizeof(xprt->addr)) {
|
|
dprintk("RPC: xs_setup_xprt: address too large\n");
|
|
return ERR_PTR(-EBADF);
|
|
}
|
|
|
|
new = kzalloc(sizeof(*new), GFP_KERNEL);
|
|
if (new == NULL) {
|
|
dprintk("RPC: xs_setup_xprt: couldn't allocate "
|
|
"rpc_xprt\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
xprt = &new->xprt;
|
|
|
|
xprt->max_reqs = slot_table_size;
|
|
xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
|
|
if (xprt->slot == NULL) {
|
|
kfree(xprt);
|
|
dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
|
|
"table\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
memcpy(&xprt->addr, addr, addrlen);
|
|
xprt->addrlen = addrlen;
|
|
new->port = xs_get_random_port();
|
|
|
|
return xprt;
|
|
}
|
|
|
|
/**
|
|
* xs_setup_udp - Set up transport to use a UDP socket
|
|
* @addr: address of remote server
|
|
* @addrlen: length of address in bytes
|
|
* @to: timeout parameters
|
|
*
|
|
*/
|
|
struct rpc_xprt *xs_setup_udp(struct sockaddr *addr, size_t addrlen, struct rpc_timeout *to)
|
|
{
|
|
struct rpc_xprt *xprt;
|
|
struct sock_xprt *transport;
|
|
|
|
xprt = xs_setup_xprt(addr, addrlen, xprt_udp_slot_table_entries);
|
|
if (IS_ERR(xprt))
|
|
return xprt;
|
|
transport = container_of(xprt, struct sock_xprt, xprt);
|
|
|
|
if (ntohs(((struct sockaddr_in *)addr)->sin_port) != 0)
|
|
xprt_set_bound(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);
|
|
|
|
INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_connect_worker);
|
|
xprt->bind_timeout = XS_BIND_TO;
|
|
xprt->connect_timeout = XS_UDP_CONN_TO;
|
|
xprt->reestablish_timeout = XS_UDP_REEST_TO;
|
|
xprt->idle_timeout = XS_IDLE_DISC_TO;
|
|
|
|
xprt->ops = &xs_udp_ops;
|
|
|
|
if (to)
|
|
xprt->timeout = *to;
|
|
else
|
|
xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
|
|
|
|
xs_format_peer_addresses(xprt);
|
|
dprintk("RPC: set up transport to address %s\n",
|
|
xprt->address_strings[RPC_DISPLAY_ALL]);
|
|
|
|
return xprt;
|
|
}
|
|
|
|
/**
|
|
* xs_setup_tcp - Set up transport to use a TCP socket
|
|
* @addr: address of remote server
|
|
* @addrlen: length of address in bytes
|
|
* @to: timeout parameters
|
|
*
|
|
*/
|
|
struct rpc_xprt *xs_setup_tcp(struct sockaddr *addr, size_t addrlen, struct rpc_timeout *to)
|
|
{
|
|
struct rpc_xprt *xprt;
|
|
struct sock_xprt *transport;
|
|
|
|
xprt = xs_setup_xprt(addr, addrlen, xprt_tcp_slot_table_entries);
|
|
if (IS_ERR(xprt))
|
|
return xprt;
|
|
transport = container_of(xprt, struct sock_xprt, xprt);
|
|
|
|
if (ntohs(((struct sockaddr_in *)addr)->sin_port) != 0)
|
|
xprt_set_bound(xprt);
|
|
|
|
xprt->prot = IPPROTO_TCP;
|
|
xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
|
|
xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
|
|
|
|
INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker);
|
|
xprt->bind_timeout = XS_BIND_TO;
|
|
xprt->connect_timeout = XS_TCP_CONN_TO;
|
|
xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
|
|
xprt->idle_timeout = XS_IDLE_DISC_TO;
|
|
|
|
xprt->ops = &xs_tcp_ops;
|
|
|
|
if (to)
|
|
xprt->timeout = *to;
|
|
else
|
|
xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
|
|
|
|
xs_format_peer_addresses(xprt);
|
|
dprintk("RPC: set up transport to address %s\n",
|
|
xprt->address_strings[RPC_DISPLAY_ALL]);
|
|
|
|
return xprt;
|
|
}
|
|
|
|
/**
|
|
* init_socket_xprt - set up xprtsock's sysctls
|
|
*
|
|
*/
|
|
int init_socket_xprt(void)
|
|
{
|
|
#ifdef RPC_DEBUG
|
|
if (!sunrpc_table_header)
|
|
sunrpc_table_header = register_sysctl_table(sunrpc_table);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cleanup_socket_xprt - remove xprtsock's sysctls
|
|
*
|
|
*/
|
|
void cleanup_socket_xprt(void)
|
|
{
|
|
#ifdef RPC_DEBUG
|
|
if (sunrpc_table_header) {
|
|
unregister_sysctl_table(sunrpc_table_header);
|
|
sunrpc_table_header = NULL;
|
|
}
|
|
#endif
|
|
}
|