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88b94fba38
This bug results in data corruption with NFS/TCP. Writes are silently dropped on EWOULDBLOCK (because socket send buffer is full and sockbuf timer fires). Reviewed by: ups@
1921 lines
49 KiB
C
1921 lines
49 KiB
C
/*-
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* Copyright (c) 1989, 1991, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Socket operations for use by nfs
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*/
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/signalvar.h>
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#include <sys/syscallsubr.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/vnode.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <rpc/rpcclnt.h>
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#include <nfs/rpcv2.h>
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#include <nfs/nfsproto.h>
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#include <nfsclient/nfs.h>
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#include <nfs/xdr_subs.h>
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#include <nfsclient/nfsm_subs.h>
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#include <nfsclient/nfsmount.h>
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#include <nfsclient/nfsnode.h>
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#include <nfs4client/nfs4.h>
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#define TRUE 1
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#define FALSE 0
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extern u_int32_t nfs_xid;
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static int nfs_realign_test;
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static int nfs_realign_count;
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static int nfs_bufpackets = 4;
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static int nfs_reconnects;
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static int nfs3_jukebox_delay = 10;
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SYSCTL_DECL(_vfs_nfs);
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SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, "");
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SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, "");
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SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0, "");
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SYSCTL_INT(_vfs_nfs, OID_AUTO, reconnects, CTLFLAG_RD, &nfs_reconnects, 0,
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"number of times the nfs client has had to reconnect");
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SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs3_jukebox_delay, CTLFLAG_RW, &nfs3_jukebox_delay, 0,
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"number of seconds to delay a retry after receiving EJUKEBOX");
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/*
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* There is a congestion window for outstanding rpcs maintained per mount
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* point. The cwnd size is adjusted in roughly the way that:
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* Van Jacobson, Congestion avoidance and Control, In "Proceedings of
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* SIGCOMM '88". ACM, August 1988.
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* describes for TCP. The cwnd size is chopped in half on a retransmit timeout
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* and incremented by 1/cwnd when each rpc reply is received and a full cwnd
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* of rpcs is in progress.
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* (The sent count and cwnd are scaled for integer arith.)
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* Variants of "slow start" were tried and were found to be too much of a
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* performance hit (ave. rtt 3 times larger),
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* I suspect due to the large rtt that nfs rpcs have.
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*/
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#define NFS_CWNDSCALE 256
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#define NFS_MAXCWND (NFS_CWNDSCALE * 32)
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#define NFS_NBACKOFF 8
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static int nfs_backoff[NFS_NBACKOFF] = { 2, 4, 8, 16, 32, 64, 128, 256, };
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struct callout nfs_callout;
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static int nfs_msg(struct thread *, const char *, const char *, int);
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static int nfs_realign(struct mbuf **pm, int hsiz);
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static int nfs_reply(struct nfsreq *);
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static void nfs_softterm(struct nfsreq *rep);
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static int nfs_reconnect(struct nfsreq *rep);
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static void nfs_clnt_tcp_soupcall(struct socket *so, void *arg, int waitflag);
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static void nfs_clnt_udp_soupcall(struct socket *so, void *arg, int waitflag);
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extern struct mtx nfs_reqq_mtx;
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/*
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* RTT estimator
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*/
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static enum nfs_rto_timer_t nfs_proct[NFS_NPROCS] = {
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NFS_DEFAULT_TIMER, /* NULL */
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NFS_GETATTR_TIMER, /* GETATTR */
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NFS_DEFAULT_TIMER, /* SETATTR */
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NFS_LOOKUP_TIMER, /* LOOKUP */
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NFS_GETATTR_TIMER, /* ACCESS */
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NFS_READ_TIMER, /* READLINK */
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NFS_READ_TIMER, /* READ */
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NFS_WRITE_TIMER, /* WRITE */
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NFS_DEFAULT_TIMER, /* CREATE */
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NFS_DEFAULT_TIMER, /* MKDIR */
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NFS_DEFAULT_TIMER, /* SYMLINK */
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NFS_DEFAULT_TIMER, /* MKNOD */
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NFS_DEFAULT_TIMER, /* REMOVE */
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NFS_DEFAULT_TIMER, /* RMDIR */
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NFS_DEFAULT_TIMER, /* RENAME */
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NFS_DEFAULT_TIMER, /* LINK */
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NFS_READ_TIMER, /* READDIR */
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NFS_READ_TIMER, /* READDIRPLUS */
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NFS_DEFAULT_TIMER, /* FSSTAT */
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NFS_DEFAULT_TIMER, /* FSINFO */
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NFS_DEFAULT_TIMER, /* PATHCONF */
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NFS_DEFAULT_TIMER, /* COMMIT */
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NFS_DEFAULT_TIMER, /* NOOP */
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};
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/*
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* Choose the correct RTT timer for this NFS procedure.
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*/
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static inline enum nfs_rto_timer_t
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nfs_rto_timer(u_int32_t procnum)
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{
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return nfs_proct[procnum];
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}
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/*
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* Initialize the RTT estimator state for a new mount point.
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*/
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static void
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nfs_init_rtt(struct nfsmount *nmp)
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{
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int i;
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for (i = 0; i < NFS_MAX_TIMER; i++)
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nmp->nm_srtt[i] = NFS_INITRTT;
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for (i = 0; i < NFS_MAX_TIMER; i++)
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nmp->nm_sdrtt[i] = 0;
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}
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/*
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* Update a mount point's RTT estimator state using data from the
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* passed-in request.
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*
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* Use a gain of 0.125 on the mean and a gain of 0.25 on the deviation.
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*
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* NB: Since the timer resolution of NFS_HZ is so course, it can often
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* result in r_rtt == 0. Since r_rtt == N means that the actual RTT is
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* between N + dt and N + 2 - dt ticks, add 1 before calculating the
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* update values.
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*/
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static void
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nfs_update_rtt(struct nfsreq *rep)
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{
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int t1 = rep->r_rtt + 1;
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int index = nfs_rto_timer(rep->r_procnum) - 1;
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int *srtt = &rep->r_nmp->nm_srtt[index];
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int *sdrtt = &rep->r_nmp->nm_sdrtt[index];
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t1 -= *srtt >> 3;
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*srtt += t1;
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if (t1 < 0)
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t1 = -t1;
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t1 -= *sdrtt >> 2;
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*sdrtt += t1;
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}
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/*
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* Estimate RTO for an NFS RPC sent via an unreliable datagram.
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*
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* Use the mean and mean deviation of RTT for the appropriate type
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* of RPC for the frequent RPCs and a default for the others.
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* The justification for doing "other" this way is that these RPCs
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* happen so infrequently that timer est. would probably be stale.
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* Also, since many of these RPCs are non-idempotent, a conservative
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* timeout is desired.
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*
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* getattr, lookup - A+2D
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* read, write - A+4D
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* other - nm_timeo
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*/
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static int
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nfs_estimate_rto(struct nfsmount *nmp, u_int32_t procnum)
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{
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enum nfs_rto_timer_t timer = nfs_rto_timer(procnum);
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int index = timer - 1;
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int rto;
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switch (timer) {
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case NFS_GETATTR_TIMER:
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case NFS_LOOKUP_TIMER:
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rto = ((nmp->nm_srtt[index] + 3) >> 2) +
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((nmp->nm_sdrtt[index] + 1) >> 1);
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break;
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case NFS_READ_TIMER:
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case NFS_WRITE_TIMER:
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rto = ((nmp->nm_srtt[index] + 7) >> 3) +
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(nmp->nm_sdrtt[index] + 1);
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break;
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default:
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rto = nmp->nm_timeo;
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return (rto);
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}
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if (rto < NFS_MINRTO)
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rto = NFS_MINRTO;
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else if (rto > NFS_MAXRTO)
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rto = NFS_MAXRTO;
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return (rto);
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}
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/*
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* Initialize sockets and congestion for a new NFS connection.
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* We do not free the sockaddr if error.
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*/
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int
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nfs_connect(struct nfsmount *nmp, struct nfsreq *rep)
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{
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struct socket *so;
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int error, rcvreserve, sndreserve;
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int pktscale;
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struct sockaddr *saddr;
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struct thread *td = &thread0; /* only used for socreate and sobind */
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NET_LOCK_GIANT();
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if (nmp->nm_sotype == SOCK_STREAM) {
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mtx_lock(&nmp->nm_mtx);
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nmp->nm_nfstcpstate.flags |= NFS_TCP_EXPECT_RPCMARKER;
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nmp->nm_nfstcpstate.rpcresid = 0;
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mtx_unlock(&nmp->nm_mtx);
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}
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nmp->nm_so = NULL;
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saddr = nmp->nm_nam;
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error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype,
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nmp->nm_soproto, nmp->nm_mountp->mnt_cred, td);
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if (error)
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goto bad;
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so = nmp->nm_so;
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nmp->nm_soflags = so->so_proto->pr_flags;
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/*
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* Some servers require that the client port be a reserved port number.
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*/
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if (nmp->nm_flag & NFSMNT_RESVPORT) {
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struct sockopt sopt;
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int ip, ip2, len;
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struct sockaddr_in6 ssin;
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struct sockaddr *sa;
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bzero(&sopt, sizeof sopt);
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switch(saddr->sa_family) {
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case AF_INET:
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sopt.sopt_level = IPPROTO_IP;
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sopt.sopt_name = IP_PORTRANGE;
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ip = IP_PORTRANGE_LOW;
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ip2 = IP_PORTRANGE_DEFAULT;
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len = sizeof (struct sockaddr_in);
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break;
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#ifdef INET6
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case AF_INET6:
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sopt.sopt_level = IPPROTO_IPV6;
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sopt.sopt_name = IPV6_PORTRANGE;
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ip = IPV6_PORTRANGE_LOW;
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ip2 = IPV6_PORTRANGE_DEFAULT;
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len = sizeof (struct sockaddr_in6);
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break;
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#endif
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default:
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goto noresvport;
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}
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sa = (struct sockaddr *)&ssin;
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bzero(sa, len);
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sa->sa_len = len;
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sa->sa_family = saddr->sa_family;
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sopt.sopt_dir = SOPT_SET;
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sopt.sopt_val = (void *)&ip;
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sopt.sopt_valsize = sizeof(ip);
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error = sosetopt(so, &sopt);
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if (error)
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goto bad;
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error = sobind(so, sa, td);
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if (error)
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goto bad;
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ip = ip2;
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error = sosetopt(so, &sopt);
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if (error)
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goto bad;
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noresvport: ;
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}
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/*
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* Protocols that do not require connections may be optionally left
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* unconnected for servers that reply from a port other than NFS_PORT.
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*/
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mtx_lock(&nmp->nm_mtx);
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if (nmp->nm_flag & NFSMNT_NOCONN) {
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if (nmp->nm_soflags & PR_CONNREQUIRED) {
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error = ENOTCONN;
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mtx_unlock(&nmp->nm_mtx);
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goto bad;
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} else
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mtx_unlock(&nmp->nm_mtx);
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} else {
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mtx_unlock(&nmp->nm_mtx);
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error = soconnect(so, nmp->nm_nam, td);
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if (error)
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goto bad;
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/*
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* Wait for the connection to complete. Cribbed from the
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* connect system call but with the wait timing out so
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* that interruptible mounts don't hang here for a long time.
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*/
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SOCK_LOCK(so);
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while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
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(void) msleep(&so->so_timeo, SOCK_MTX(so),
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PSOCK, "nfscon", 2 * hz);
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if ((so->so_state & SS_ISCONNECTING) &&
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so->so_error == 0 && rep &&
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(error = nfs_sigintr(nmp, rep, rep->r_td)) != 0) {
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so->so_state &= ~SS_ISCONNECTING;
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SOCK_UNLOCK(so);
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goto bad;
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}
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}
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if (so->so_error) {
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error = so->so_error;
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so->so_error = 0;
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SOCK_UNLOCK(so);
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goto bad;
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}
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SOCK_UNLOCK(so);
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}
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so->so_rcv.sb_timeo = 12 * hz;
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so->so_snd.sb_timeo = 5 * hz;
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/*
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* Get buffer reservation size from sysctl, but impose reasonable
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* limits.
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*/
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pktscale = nfs_bufpackets;
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if (pktscale < 2)
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pktscale = 2;
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if (pktscale > 64)
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pktscale = 64;
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mtx_lock(&nmp->nm_mtx);
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if (nmp->nm_sotype == SOCK_DGRAM) {
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sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
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rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
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NFS_MAXPKTHDR) * pktscale;
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} else if (nmp->nm_sotype == SOCK_SEQPACKET) {
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sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
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rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
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NFS_MAXPKTHDR) * pktscale;
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} else {
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if (nmp->nm_sotype != SOCK_STREAM)
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panic("nfscon sotype");
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if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
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struct sockopt sopt;
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int val;
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bzero(&sopt, sizeof sopt);
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sopt.sopt_dir = SOPT_SET;
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sopt.sopt_level = SOL_SOCKET;
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sopt.sopt_name = SO_KEEPALIVE;
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sopt.sopt_val = &val;
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sopt.sopt_valsize = sizeof val;
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val = 1;
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mtx_unlock(&nmp->nm_mtx);
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sosetopt(so, &sopt);
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mtx_lock(&nmp->nm_mtx);
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}
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if (so->so_proto->pr_protocol == IPPROTO_TCP) {
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struct sockopt sopt;
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int val;
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bzero(&sopt, sizeof sopt);
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sopt.sopt_dir = SOPT_SET;
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sopt.sopt_level = IPPROTO_TCP;
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sopt.sopt_name = TCP_NODELAY;
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sopt.sopt_val = &val;
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sopt.sopt_valsize = sizeof val;
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val = 1;
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mtx_unlock(&nmp->nm_mtx);
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sosetopt(so, &sopt);
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mtx_lock(&nmp->nm_mtx);
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}
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sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR +
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sizeof (u_int32_t)) * pktscale;
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rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR +
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sizeof (u_int32_t)) * pktscale;
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}
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mtx_unlock(&nmp->nm_mtx);
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error = soreserve(so, sndreserve, rcvreserve);
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if (error)
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goto bad;
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SOCKBUF_LOCK(&so->so_rcv);
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so->so_rcv.sb_flags |= SB_NOINTR;
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so->so_upcallarg = (caddr_t)nmp;
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if (so->so_type == SOCK_STREAM)
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so->so_upcall = nfs_clnt_tcp_soupcall;
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else
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so->so_upcall = nfs_clnt_udp_soupcall;
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so->so_rcv.sb_flags |= SB_UPCALL;
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SOCKBUF_UNLOCK(&so->so_rcv);
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SOCKBUF_LOCK(&so->so_snd);
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so->so_snd.sb_flags |= SB_NOINTR;
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SOCKBUF_UNLOCK(&so->so_snd);
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mtx_lock(&nmp->nm_mtx);
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/* Initialize other non-zero congestion variables */
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nfs_init_rtt(nmp);
|
|
nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */
|
|
nmp->nm_sent = 0;
|
|
nmp->nm_timeouts = 0;
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
NET_UNLOCK_GIANT();
|
|
return (0);
|
|
|
|
bad:
|
|
nfs_disconnect(nmp);
|
|
NET_UNLOCK_GIANT();
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Reconnect routine:
|
|
* Called when a connection is broken on a reliable protocol.
|
|
* - clean up the old socket
|
|
* - nfs_connect() again
|
|
* - set R_MUSTRESEND for all outstanding requests on mount point
|
|
* If this fails the mount point is DEAD!
|
|
* nb: Must be called with the nfs_sndlock() set on the mount point.
|
|
*/
|
|
static int
|
|
nfs_reconnect(struct nfsreq *rep)
|
|
{
|
|
struct nfsreq *rp;
|
|
struct nfsmount *nmp = rep->r_nmp;
|
|
int error;
|
|
|
|
nfs_reconnects++;
|
|
nfs_disconnect(nmp);
|
|
while ((error = nfs_connect(nmp, rep)) != 0) {
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
if (error == EIO || error == EINTR)
|
|
return (error);
|
|
mtx_lock(&Giant);
|
|
(void) tsleep(&lbolt, PSOCK, "nfscon", 0);
|
|
mtx_unlock(&Giant);
|
|
}
|
|
|
|
/*
|
|
* Clear the FORCE_RECONNECT flag only after the connect
|
|
* succeeds. To prevent races between multiple processes
|
|
* waiting on the mountpoint where the connection is being
|
|
* torn down. The first one to acquire the sndlock will
|
|
* retry the connection. The others block on the sndlock
|
|
* until the connection is established successfully, and
|
|
* then re-transmit the request.
|
|
*/
|
|
mtx_lock(&nmp->nm_mtx);
|
|
nmp->nm_nfstcpstate.flags &= ~NFS_TCP_FORCE_RECONNECT;
|
|
nmp->nm_nfstcpstate.rpcresid = 0;
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
|
|
/*
|
|
* Loop through outstanding request list and fix up all requests
|
|
* on old socket.
|
|
*/
|
|
mtx_lock(&nfs_reqq_mtx);
|
|
TAILQ_FOREACH(rp, &nfs_reqq, r_chain) {
|
|
if (rp->r_nmp == nmp) {
|
|
mtx_lock(&rp->r_mtx);
|
|
rp->r_flags |= R_MUSTRESEND;
|
|
mtx_unlock(&rp->r_mtx);
|
|
}
|
|
}
|
|
mtx_unlock(&nfs_reqq_mtx);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* NFS disconnect. Clean up and unlink.
|
|
*/
|
|
void
|
|
nfs_disconnect(struct nfsmount *nmp)
|
|
{
|
|
struct socket *so;
|
|
|
|
NET_ASSERT_GIANT();
|
|
|
|
mtx_lock(&nmp->nm_mtx);
|
|
if (nmp->nm_so) {
|
|
so = nmp->nm_so;
|
|
nmp->nm_so = NULL;
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
so->so_upcallarg = NULL;
|
|
so->so_upcall = NULL;
|
|
so->so_rcv.sb_flags &= ~SB_UPCALL;
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
soshutdown(so, SHUT_WR);
|
|
soclose(so);
|
|
} else
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
}
|
|
|
|
void
|
|
nfs_safedisconnect(struct nfsmount *nmp)
|
|
{
|
|
struct nfsreq dummyreq;
|
|
|
|
bzero(&dummyreq, sizeof(dummyreq));
|
|
dummyreq.r_nmp = nmp;
|
|
nfs_disconnect(nmp);
|
|
}
|
|
|
|
/*
|
|
* This is the nfs send routine. For connection based socket types, it
|
|
* must be called with an nfs_sndlock() on the socket.
|
|
* - return EINTR if the RPC is terminated, 0 otherwise
|
|
* - set R_MUSTRESEND if the send fails for any reason
|
|
* - do any cleanup required by recoverable socket errors (?)
|
|
*/
|
|
int
|
|
nfs_send(struct socket *so, struct sockaddr *nam, struct mbuf *top,
|
|
struct nfsreq *rep)
|
|
{
|
|
struct sockaddr *sendnam;
|
|
int error, error2, soflags, flags;
|
|
|
|
NET_LOCK_GIANT();
|
|
|
|
KASSERT(rep, ("nfs_send: called with rep == NULL"));
|
|
|
|
error = nfs_sigintr(rep->r_nmp, rep, rep->r_td);
|
|
if (error) {
|
|
m_freem(top);
|
|
goto out;
|
|
}
|
|
mtx_lock(&rep->r_nmp->nm_mtx);
|
|
mtx_lock(&rep->r_mtx);
|
|
if ((so = rep->r_nmp->nm_so) == NULL) {
|
|
rep->r_flags |= R_MUSTRESEND;
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&rep->r_nmp->nm_mtx);
|
|
m_freem(top);
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
rep->r_flags &= ~R_MUSTRESEND;
|
|
soflags = rep->r_nmp->nm_soflags;
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&rep->r_nmp->nm_mtx);
|
|
|
|
if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED))
|
|
sendnam = NULL;
|
|
else
|
|
sendnam = nam;
|
|
if (so->so_type == SOCK_SEQPACKET)
|
|
flags = MSG_EOR;
|
|
else
|
|
flags = 0;
|
|
|
|
error = sosend(so, sendnam, 0, top, 0, flags, curthread /*XXX*/);
|
|
if (error == ENOBUFS && so->so_type == SOCK_DGRAM) {
|
|
error = 0;
|
|
mtx_lock(&rep->r_mtx);
|
|
rep->r_flags |= R_MUSTRESEND;
|
|
mtx_unlock(&rep->r_mtx);
|
|
}
|
|
|
|
if (error) {
|
|
/*
|
|
* Don't report EPIPE errors on nfs sockets.
|
|
* These can be due to idle tcp mounts which will be closed by
|
|
* netapp, solaris, etc. if left idle too long.
|
|
*/
|
|
if (error != EPIPE) {
|
|
log(LOG_INFO, "nfs send error %d for server %s\n",
|
|
error,
|
|
rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
|
|
}
|
|
/*
|
|
* Deal with errors for the client side.
|
|
*/
|
|
error2 = NFS_SIGREP(rep);
|
|
if (error2)
|
|
error = error2;
|
|
else {
|
|
mtx_lock(&rep->r_mtx);
|
|
rep->r_flags |= R_MUSTRESEND;
|
|
mtx_unlock(&rep->r_mtx);
|
|
}
|
|
|
|
/*
|
|
* Handle any recoverable (soft) socket errors here. (?)
|
|
* Make EWOULDBLOCK a recoverable error, we'll rexmit from nfs_timer().
|
|
*/
|
|
if (error != EINTR && error != ERESTART && error != EIO && error != EPIPE)
|
|
error = 0;
|
|
}
|
|
out:
|
|
NET_UNLOCK_GIANT();
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
nfs_reply(struct nfsreq *rep)
|
|
{
|
|
register struct socket *so;
|
|
register struct mbuf *m;
|
|
int error = 0, sotype, slpflag;
|
|
|
|
NET_LOCK_GIANT();
|
|
|
|
sotype = rep->r_nmp->nm_sotype;
|
|
/*
|
|
* For reliable protocols, lock against other senders/receivers
|
|
* in case a reconnect is necessary.
|
|
*/
|
|
if (sotype != SOCK_DGRAM) {
|
|
error = nfs_sndlock(rep);
|
|
if (error)
|
|
goto out;
|
|
tryagain:
|
|
mtx_lock(&rep->r_nmp->nm_mtx);
|
|
mtx_lock(&rep->r_mtx);
|
|
if (rep->r_mrep) {
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&rep->r_nmp->nm_mtx);
|
|
nfs_sndunlock(rep);
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
if (rep->r_flags & R_SOFTTERM) {
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&rep->r_nmp->nm_mtx);
|
|
nfs_sndunlock(rep);
|
|
error = EINTR;
|
|
goto out;
|
|
}
|
|
so = rep->r_nmp->nm_so;
|
|
if (!so ||
|
|
(rep->r_nmp->nm_nfstcpstate.flags & NFS_TCP_FORCE_RECONNECT)) {
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&rep->r_nmp->nm_mtx);
|
|
error = nfs_reconnect(rep);
|
|
if (error) {
|
|
nfs_sndunlock(rep);
|
|
goto out;
|
|
}
|
|
goto tryagain;
|
|
}
|
|
while (rep->r_flags & R_MUSTRESEND) {
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&rep->r_nmp->nm_mtx);
|
|
m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT);
|
|
nfsstats.rpcretries++;
|
|
error = nfs_send(so, rep->r_nmp->nm_nam, m, rep);
|
|
if (error) {
|
|
if (error == EINTR || error == ERESTART ||
|
|
(error = nfs_reconnect(rep)) != 0) {
|
|
nfs_sndunlock(rep);
|
|
goto out;
|
|
}
|
|
goto tryagain;
|
|
}
|
|
mtx_lock(&rep->r_nmp->nm_mtx);
|
|
mtx_lock(&rep->r_mtx);
|
|
}
|
|
mtx_unlock(&rep->r_nmp->nm_mtx);
|
|
mtx_unlock(&rep->r_mtx);
|
|
nfs_sndunlock(rep);
|
|
}
|
|
slpflag = 0;
|
|
mtx_lock(&rep->r_nmp->nm_mtx);
|
|
if (rep->r_nmp->nm_flag & NFSMNT_INT)
|
|
slpflag = PCATCH;
|
|
mtx_unlock(&rep->r_nmp->nm_mtx);
|
|
mtx_lock(&rep->r_mtx);
|
|
while ((rep->r_mrep == NULL) && (error == 0) &&
|
|
((rep->r_flags & R_SOFTTERM) == 0) &&
|
|
((sotype == SOCK_DGRAM) || ((rep->r_flags & R_MUSTRESEND) == 0)))
|
|
error = msleep((caddr_t)rep, &rep->r_mtx,
|
|
slpflag | (PZERO - 1), "nfsreq", 0);
|
|
if (error == EINTR || error == ERESTART) {
|
|
/* NFS operations aren't restartable. Map ERESTART to EINTR */
|
|
error = EINTR;
|
|
mtx_unlock(&rep->r_mtx);
|
|
goto out;
|
|
}
|
|
if (rep->r_flags & R_SOFTTERM) {
|
|
/* Request was terminated because we exceeded the retries (soft mount) */
|
|
error = ETIMEDOUT;
|
|
mtx_unlock(&rep->r_mtx);
|
|
goto out;
|
|
}
|
|
mtx_unlock(&rep->r_mtx);
|
|
if (sotype == SOCK_STREAM) {
|
|
mtx_lock(&rep->r_nmp->nm_mtx);
|
|
mtx_lock(&rep->r_mtx);
|
|
if (((rep->r_nmp->nm_nfstcpstate.flags & NFS_TCP_FORCE_RECONNECT) ||
|
|
(rep->r_flags & R_MUSTRESEND))) {
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&rep->r_nmp->nm_mtx);
|
|
error = nfs_sndlock(rep);
|
|
if (error)
|
|
goto out;
|
|
goto tryagain;
|
|
} else {
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&rep->r_nmp->nm_mtx);
|
|
}
|
|
}
|
|
out:
|
|
NET_UNLOCK_GIANT();
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* XXX TO DO
|
|
* Make nfs_realign() non-blocking. Also make nfsm_dissect() nonblocking.
|
|
*/
|
|
static void
|
|
nfs_clnt_match_xid(struct socket *so,
|
|
struct nfsmount *nmp,
|
|
struct mbuf *mrep)
|
|
{
|
|
struct mbuf *md;
|
|
caddr_t dpos;
|
|
u_int32_t rxid, *tl;
|
|
struct nfsreq *rep;
|
|
int error;
|
|
|
|
/*
|
|
* Search for any mbufs that are not a multiple of 4 bytes long
|
|
* or with m_data not longword aligned.
|
|
* These could cause pointer alignment problems, so copy them to
|
|
* well aligned mbufs.
|
|
*/
|
|
if (nfs_realign(&mrep, 5 * NFSX_UNSIGNED) == ENOMEM) {
|
|
m_freem(mrep);
|
|
nfsstats.rpcinvalid++;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Get the xid and check that it is an rpc reply
|
|
*/
|
|
md = mrep;
|
|
dpos = mtod(md, caddr_t);
|
|
tl = nfsm_dissect_nonblock(u_int32_t *, 2*NFSX_UNSIGNED);
|
|
rxid = *tl++;
|
|
if (*tl != rpc_reply) {
|
|
m_freem(mrep);
|
|
nfsmout:
|
|
nfsstats.rpcinvalid++;
|
|
return;
|
|
}
|
|
|
|
mtx_lock(&nfs_reqq_mtx);
|
|
/*
|
|
* Loop through the request list to match up the reply
|
|
* Iff no match, just drop the datagram
|
|
*/
|
|
TAILQ_FOREACH(rep, &nfs_reqq, r_chain) {
|
|
mtx_lock(&nmp->nm_mtx);
|
|
mtx_lock(&rep->r_mtx);
|
|
if (rep->r_mrep == NULL && rxid == rep->r_xid) {
|
|
/* Found it.. */
|
|
rep->r_mrep = mrep;
|
|
rep->r_md = md;
|
|
rep->r_dpos = dpos;
|
|
/*
|
|
* Update congestion window.
|
|
* Do the additive increase of
|
|
* one rpc/rtt.
|
|
*/
|
|
if (nmp->nm_cwnd <= nmp->nm_sent) {
|
|
nmp->nm_cwnd +=
|
|
(NFS_CWNDSCALE * NFS_CWNDSCALE +
|
|
(nmp->nm_cwnd >> 1)) / nmp->nm_cwnd;
|
|
if (nmp->nm_cwnd > NFS_MAXCWND)
|
|
nmp->nm_cwnd = NFS_MAXCWND;
|
|
}
|
|
if (rep->r_flags & R_SENT) {
|
|
rep->r_flags &= ~R_SENT;
|
|
nmp->nm_sent -= NFS_CWNDSCALE;
|
|
}
|
|
if (rep->r_flags & R_TIMING)
|
|
nfs_update_rtt(rep);
|
|
nmp->nm_timeouts = 0;
|
|
wakeup((caddr_t)rep);
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
break;
|
|
}
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
}
|
|
/*
|
|
* If not matched to a request, drop it.
|
|
* If it's mine, wake up requestor.
|
|
*/
|
|
if (rep == 0) {
|
|
nfsstats.rpcunexpected++;
|
|
m_freem(mrep);
|
|
}
|
|
mtx_unlock(&nfs_reqq_mtx);
|
|
}
|
|
|
|
static void
|
|
nfs_mark_for_reconnect(struct nfsmount *nmp)
|
|
{
|
|
struct nfsreq *rp;
|
|
|
|
mtx_lock(&nmp->nm_mtx);
|
|
nmp->nm_nfstcpstate.flags |= NFS_TCP_FORCE_RECONNECT;
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
/*
|
|
* Wakeup all processes that are waiting for replies
|
|
* on this mount point. One of them does the reconnect.
|
|
*/
|
|
mtx_lock(&nfs_reqq_mtx);
|
|
TAILQ_FOREACH(rp, &nfs_reqq, r_chain) {
|
|
if (rp->r_nmp == nmp) {
|
|
mtx_lock(&rp->r_mtx);
|
|
rp->r_flags |= R_MUSTRESEND;
|
|
wakeup((caddr_t)rp);
|
|
mtx_unlock(&rp->r_mtx);
|
|
}
|
|
}
|
|
mtx_unlock(&nfs_reqq_mtx);
|
|
}
|
|
|
|
static int
|
|
nfstcp_readable(struct socket *so, int bytes)
|
|
{
|
|
int retval;
|
|
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
retval = (so->so_rcv.sb_cc >= (bytes) ||
|
|
(so->so_rcv.sb_state & SBS_CANTRCVMORE) ||
|
|
so->so_error);
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
return (retval);
|
|
}
|
|
|
|
#define nfstcp_marker_readable(so) nfstcp_readable(so, sizeof(u_int32_t))
|
|
|
|
static int
|
|
nfs_copy_len(struct mbuf *mp, char *buf, int len)
|
|
{
|
|
while (len > 0 && mp != NULL) {
|
|
int copylen = min(len, mp->m_len);
|
|
|
|
bcopy(mp->m_data, buf, copylen);
|
|
buf += copylen;
|
|
len -= copylen;
|
|
mp = mp->m_next;
|
|
}
|
|
return (len);
|
|
}
|
|
|
|
static void
|
|
nfs_clnt_tcp_soupcall(struct socket *so, void *arg, int waitflag)
|
|
{
|
|
struct nfsmount *nmp = (struct nfsmount *)arg;
|
|
struct mbuf *mp = NULL;
|
|
struct uio auio;
|
|
int error;
|
|
u_int32_t len;
|
|
int rcvflg;
|
|
|
|
/*
|
|
* Don't pick any more data from the socket if we've marked the
|
|
* mountpoint for reconnect.
|
|
*/
|
|
mtx_lock(&nmp->nm_mtx);
|
|
if (nmp->nm_nfstcpstate.flags & NFS_TCP_FORCE_RECONNECT) {
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
return;
|
|
} else
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
auio.uio_td = curthread;
|
|
auio.uio_segflg = UIO_SYSSPACE;
|
|
auio.uio_rw = UIO_READ;
|
|
for ( ; ; ) {
|
|
mtx_lock(&nmp->nm_mtx);
|
|
if (nmp->nm_nfstcpstate.flags & NFS_TCP_EXPECT_RPCMARKER) {
|
|
int resid;
|
|
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
if (!nfstcp_marker_readable(so)) {
|
|
/* Marker is not readable */
|
|
return;
|
|
}
|
|
auio.uio_resid = sizeof(u_int32_t);
|
|
auio.uio_iov = NULL;
|
|
auio.uio_iovcnt = 0;
|
|
mp = NULL;
|
|
rcvflg = (MSG_DONTWAIT | MSG_SOCALLBCK);
|
|
error = soreceive(so, (struct sockaddr **)0, &auio,
|
|
&mp, (struct mbuf **)0, &rcvflg);
|
|
/*
|
|
* We've already tested that the socket is readable. 2 cases
|
|
* here, we either read 0 bytes (client closed connection),
|
|
* or got some other error. In both cases, we tear down the
|
|
* connection.
|
|
*/
|
|
if (error || auio.uio_resid > 0) {
|
|
if (error && error != ECONNRESET) {
|
|
log(LOG_ERR,
|
|
"nfs/tcp clnt: Error %d reading socket, tearing down TCP connection\n",
|
|
error);
|
|
}
|
|
goto mark_reconnect;
|
|
}
|
|
if (mp == NULL)
|
|
panic("nfs_clnt_tcp_soupcall: Got empty mbuf chain from sorecv\n");
|
|
/*
|
|
* Sigh. We can't do the obvious thing here (which would
|
|
* be to have soreceive copy the length from mbufs for us).
|
|
* Calling uiomove() from the context of a socket callback
|
|
* (even for kernel-kernel copies) leads to LORs (since
|
|
* we hold network locks at this point).
|
|
*/
|
|
if ((resid = nfs_copy_len(mp, (char *)&len,
|
|
sizeof(u_int32_t)))) {
|
|
log(LOG_ERR, "%s (%d) from nfs server %s\n",
|
|
"Bad RPC HDR length",
|
|
(int)(sizeof(u_int32_t) - resid),
|
|
nmp->nm_mountp->mnt_stat.f_mntfromname);
|
|
goto mark_reconnect;
|
|
}
|
|
len = ntohl(len) & ~0x80000000;
|
|
m_freem(mp);
|
|
/*
|
|
* This is SERIOUS! We are out of sync with the sender
|
|
* and forcing a disconnect/reconnect is all I can do.
|
|
*/
|
|
if (len > NFS_MAXPACKET || len == 0) {
|
|
log(LOG_ERR, "%s (%d) from nfs server %s\n",
|
|
"impossible packet length",
|
|
len,
|
|
nmp->nm_mountp->mnt_stat.f_mntfromname);
|
|
goto mark_reconnect;
|
|
}
|
|
mtx_lock(&nmp->nm_mtx);
|
|
nmp->nm_nfstcpstate.rpcresid = len;
|
|
nmp->nm_nfstcpstate.flags &= ~(NFS_TCP_EXPECT_RPCMARKER);
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
} else
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
|
|
/*
|
|
* Processed RPC marker or no RPC marker to process.
|
|
* Pull in and process data.
|
|
*/
|
|
mtx_lock(&nmp->nm_mtx);
|
|
if (nmp->nm_nfstcpstate.rpcresid > 0) {
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
if (!nfstcp_readable(so, nmp->nm_nfstcpstate.rpcresid)) {
|
|
/* All data not readable */
|
|
return;
|
|
}
|
|
auio.uio_resid = nmp->nm_nfstcpstate.rpcresid;
|
|
auio.uio_iov = NULL;
|
|
auio.uio_iovcnt = 0;
|
|
mp = NULL;
|
|
rcvflg = (MSG_DONTWAIT | MSG_SOCALLBCK);
|
|
error = soreceive(so, (struct sockaddr **)0, &auio,
|
|
&mp, (struct mbuf **)0, &rcvflg);
|
|
if (error || auio.uio_resid > 0) {
|
|
if (error && error != ECONNRESET) {
|
|
log(LOG_ERR,
|
|
"nfs/tcp clnt: Error %d reading socket, tearing down TCP connection\n",
|
|
error);
|
|
}
|
|
goto mark_reconnect;
|
|
}
|
|
if (mp == NULL)
|
|
panic("nfs_clnt_tcp_soupcall: Got empty mbuf chain from sorecv\n");
|
|
mtx_lock(&nmp->nm_mtx);
|
|
nmp->nm_nfstcpstate.rpcresid = 0;
|
|
nmp->nm_nfstcpstate.flags |= NFS_TCP_EXPECT_RPCMARKER;
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
/* We got the entire RPC reply. Match XIDs and wake up requestor */
|
|
nfs_clnt_match_xid(so, nmp, mp);
|
|
} else
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
}
|
|
|
|
mark_reconnect:
|
|
nfs_mark_for_reconnect(nmp);
|
|
}
|
|
|
|
static void
|
|
nfs_clnt_udp_soupcall(struct socket *so, void *arg, int waitflag)
|
|
{
|
|
struct nfsmount *nmp = (struct nfsmount *)arg;
|
|
struct uio auio;
|
|
struct mbuf *mp = NULL;
|
|
struct mbuf *control = NULL;
|
|
int error, rcvflag;
|
|
|
|
auio.uio_resid = 1000000;
|
|
auio.uio_td = curthread;
|
|
rcvflag = MSG_DONTWAIT;
|
|
auio.uio_resid = 1000000000;
|
|
do {
|
|
mp = control = NULL;
|
|
error = soreceive(so, NULL, &auio, &mp, &control, &rcvflag);
|
|
if (control)
|
|
m_freem(control);
|
|
if (mp)
|
|
nfs_clnt_match_xid(so, nmp, mp);
|
|
} while (mp && !error);
|
|
}
|
|
|
|
/*
|
|
* nfs_request - goes something like this
|
|
* - fill in request struct
|
|
* - links it into list
|
|
* - calls nfs_send() for first transmit
|
|
* - calls nfs_receive() to get reply
|
|
* - break down rpc header and return with nfs reply pointed to
|
|
* by mrep or error
|
|
* nb: always frees up mreq mbuf list
|
|
*/
|
|
int
|
|
nfs_request(struct vnode *vp, struct mbuf *mrest, int procnum,
|
|
struct thread *td, struct ucred *cred, struct mbuf **mrp,
|
|
struct mbuf **mdp, caddr_t *dposp)
|
|
{
|
|
struct mbuf *mrep, *m2;
|
|
struct nfsreq *rep;
|
|
u_int32_t *tl;
|
|
int i;
|
|
struct nfsmount *nmp;
|
|
struct mbuf *m, *md, *mheadend;
|
|
time_t waituntil;
|
|
caddr_t dpos;
|
|
int error = 0, mrest_len, auth_len, auth_type;
|
|
struct timeval now;
|
|
u_int32_t *xidp;
|
|
|
|
/* Reject requests while attempting a forced unmount. */
|
|
if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) {
|
|
m_freem(mrest);
|
|
return (ESTALE);
|
|
}
|
|
nmp = VFSTONFS(vp->v_mount);
|
|
if ((nmp->nm_flag & NFSMNT_NFSV4) != 0)
|
|
return nfs4_request(vp, mrest, procnum, td, cred, mrp, mdp, dposp);
|
|
MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK);
|
|
bzero(rep, sizeof(struct nfsreq));
|
|
rep->r_nmp = nmp;
|
|
rep->r_vp = vp;
|
|
rep->r_td = td;
|
|
rep->r_procnum = procnum;
|
|
mtx_init(&rep->r_mtx, "NFSrep lock", NULL, MTX_DEF);
|
|
|
|
getmicrouptime(&now);
|
|
rep->r_lastmsg = now.tv_sec -
|
|
((nmp->nm_tprintf_delay) - (nmp->nm_tprintf_initial_delay));
|
|
mrest_len = m_length(mrest, NULL);
|
|
|
|
/*
|
|
* Get the RPC header with authorization.
|
|
*/
|
|
auth_type = RPCAUTH_UNIX;
|
|
if (cred->cr_ngroups < 1)
|
|
panic("nfsreq nogrps");
|
|
auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ?
|
|
nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) +
|
|
5 * NFSX_UNSIGNED;
|
|
m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len,
|
|
mrest, mrest_len, &mheadend, &xidp);
|
|
|
|
/*
|
|
* For stream protocols, insert a Sun RPC Record Mark.
|
|
*/
|
|
if (nmp->nm_sotype == SOCK_STREAM) {
|
|
M_PREPEND(m, NFSX_UNSIGNED, M_TRYWAIT);
|
|
*mtod(m, u_int32_t *) = htonl(0x80000000 |
|
|
(m->m_pkthdr.len - NFSX_UNSIGNED));
|
|
}
|
|
rep->r_mreq = m;
|
|
rep->r_xid = *xidp;
|
|
tryagain:
|
|
if (nmp->nm_flag & NFSMNT_SOFT)
|
|
rep->r_retry = nmp->nm_retry;
|
|
else
|
|
rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */
|
|
rep->r_rtt = rep->r_rexmit = 0;
|
|
if (nfs_rto_timer(procnum) != NFS_DEFAULT_TIMER)
|
|
rep->r_flags = R_TIMING;
|
|
else
|
|
rep->r_flags = 0;
|
|
rep->r_mrep = NULL;
|
|
|
|
/*
|
|
* Do the client side RPC.
|
|
*/
|
|
nfsstats.rpcrequests++;
|
|
/*
|
|
* Chain request into list of outstanding requests. Be sure
|
|
* to put it LAST so timer finds oldest requests first.
|
|
*/
|
|
mtx_lock(&nfs_reqq_mtx);
|
|
if (TAILQ_EMPTY(&nfs_reqq))
|
|
callout_reset(&nfs_callout, nfs_ticks, nfs_timer, NULL);
|
|
TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain);
|
|
mtx_unlock(&nfs_reqq_mtx);
|
|
|
|
/*
|
|
* If backing off another request or avoiding congestion, don't
|
|
* send this one now but let timer do it. If not timing a request,
|
|
* do it now.
|
|
*/
|
|
mtx_lock(&nmp->nm_mtx);
|
|
if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM ||
|
|
(nmp->nm_flag & NFSMNT_DUMBTIMR) ||
|
|
nmp->nm_sent < nmp->nm_cwnd)) {
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
error = nfs_sndlock(rep);
|
|
if (!error) {
|
|
m2 = m_copym(m, 0, M_COPYALL, M_TRYWAIT);
|
|
error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep);
|
|
nfs_sndunlock(rep);
|
|
}
|
|
mtx_lock(&nfs_reqq_mtx);
|
|
/*
|
|
* nfs_timer() could've re-transmitted the request if we ended up
|
|
* blocking on nfs_send() too long, so check for R_SENT here.
|
|
*/
|
|
if (!error && (rep->r_flags & (R_SENT | R_MUSTRESEND)) == 0) {
|
|
mtx_lock(&nmp->nm_mtx);
|
|
nmp->nm_sent += NFS_CWNDSCALE;
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
rep->r_flags |= R_SENT;
|
|
}
|
|
mtx_unlock(&nfs_reqq_mtx);
|
|
} else {
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
rep->r_rtt = -1;
|
|
}
|
|
|
|
/*
|
|
* Wait for the reply from our send or the timer's.
|
|
*/
|
|
if (!error || error == EPIPE)
|
|
error = nfs_reply(rep);
|
|
|
|
/*
|
|
* RPC done, unlink the request.
|
|
*/
|
|
mtx_lock(&nfs_reqq_mtx);
|
|
/*
|
|
* nfs_timer() may be in the process of re-transmitting this request.
|
|
* nfs_timer() drops the nfs_reqq_mtx before the pru_send() (to avoid LORs).
|
|
* Wait till nfs_timer() completes the re-transmission. When the reply
|
|
* comes back, it will be discarded (since the req struct for it no longer
|
|
* exists).
|
|
*/
|
|
while (rep->r_flags & R_REXMIT_INPROG) {
|
|
msleep((caddr_t)&rep->r_flags, &nfs_reqq_mtx,
|
|
(PZERO - 1), "nfsrxmt", 0);
|
|
}
|
|
TAILQ_REMOVE(&nfs_reqq, rep, r_chain);
|
|
if (TAILQ_EMPTY(&nfs_reqq))
|
|
callout_stop(&nfs_callout);
|
|
/*
|
|
* Decrement the outstanding request count.
|
|
*/
|
|
if (rep->r_flags & R_SENT) {
|
|
rep->r_flags &= ~R_SENT; /* paranoia */
|
|
mtx_lock(&nmp->nm_mtx);
|
|
nmp->nm_sent -= NFS_CWNDSCALE;
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
}
|
|
mtx_unlock(&nfs_reqq_mtx);
|
|
|
|
/*
|
|
* If there was a successful reply and a tprintf msg.
|
|
* tprintf a response.
|
|
*/
|
|
if (!error) {
|
|
mtx_lock(&Giant);
|
|
nfs_up(rep, nmp, rep->r_td, "is alive again", NFSSTA_TIMEO);
|
|
mtx_unlock(&Giant);
|
|
}
|
|
mrep = rep->r_mrep;
|
|
md = rep->r_md;
|
|
dpos = rep->r_dpos;
|
|
if (error) {
|
|
/*
|
|
* If we got interrupted by a signal in nfs_reply(), there's
|
|
* a very small window where the reply could've come in before
|
|
* this process got scheduled in. To handle that case, we need
|
|
* to free the reply if it was delivered.
|
|
*/
|
|
if (rep->r_mrep != NULL)
|
|
m_freem(rep->r_mrep);
|
|
m_freem(rep->r_mreq);
|
|
mtx_destroy(&rep->r_mtx);
|
|
free((caddr_t)rep, M_NFSREQ);
|
|
return (error);
|
|
}
|
|
|
|
if (rep->r_mrep == NULL)
|
|
panic("nfs_request: rep->r_mrep shouldn't be NULL if no error\n");
|
|
|
|
/*
|
|
* break down the rpc header and check if ok
|
|
*/
|
|
tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED);
|
|
if (*tl++ == rpc_msgdenied) {
|
|
if (*tl == rpc_mismatch)
|
|
error = EOPNOTSUPP;
|
|
else
|
|
error = EACCES;
|
|
m_freem(mrep);
|
|
m_freem(rep->r_mreq);
|
|
mtx_destroy(&rep->r_mtx);
|
|
free((caddr_t)rep, M_NFSREQ);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Just throw away any verifyer (ie: kerberos etc).
|
|
*/
|
|
i = fxdr_unsigned(int, *tl++); /* verf type */
|
|
i = fxdr_unsigned(int32_t, *tl); /* len */
|
|
if (i > 0)
|
|
nfsm_adv(nfsm_rndup(i));
|
|
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
|
|
/* 0 == ok */
|
|
if (*tl == 0) {
|
|
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
|
|
if (*tl != 0) {
|
|
error = fxdr_unsigned(int, *tl);
|
|
if ((nmp->nm_flag & NFSMNT_NFSV3) &&
|
|
error == NFSERR_TRYLATER) {
|
|
m_freem(mrep);
|
|
error = 0;
|
|
waituntil = time_second + nfs3_jukebox_delay;
|
|
while (time_second < waituntil) {
|
|
mtx_lock(&Giant);
|
|
(void) tsleep(&lbolt, PSOCK, "nqnfstry", 0);
|
|
mtx_unlock(&Giant);
|
|
}
|
|
mtx_lock(&nfs_reqq_mtx);
|
|
if (++nfs_xid == 0)
|
|
nfs_xid++;
|
|
rep->r_xid = *xidp = txdr_unsigned(nfs_xid);
|
|
mtx_unlock(&nfs_reqq_mtx);
|
|
goto tryagain;
|
|
}
|
|
|
|
/*
|
|
* If the File Handle was stale, invalidate the
|
|
* lookup cache, just in case.
|
|
*/
|
|
if (error == ESTALE)
|
|
cache_purge(vp);
|
|
if (nmp->nm_flag & NFSMNT_NFSV3) {
|
|
*mrp = mrep;
|
|
*mdp = md;
|
|
*dposp = dpos;
|
|
error |= NFSERR_RETERR;
|
|
} else
|
|
m_freem(mrep);
|
|
m_freem(rep->r_mreq);
|
|
mtx_destroy(&rep->r_mtx);
|
|
free((caddr_t)rep, M_NFSREQ);
|
|
return (error);
|
|
}
|
|
|
|
*mrp = mrep;
|
|
*mdp = md;
|
|
*dposp = dpos;
|
|
m_freem(rep->r_mreq);
|
|
mtx_destroy(&rep->r_mtx);
|
|
FREE((caddr_t)rep, M_NFSREQ);
|
|
return (0);
|
|
}
|
|
m_freem(mrep);
|
|
error = EPROTONOSUPPORT;
|
|
nfsmout:
|
|
m_freem(rep->r_mreq);
|
|
mtx_destroy(&rep->r_mtx);
|
|
free((caddr_t)rep, M_NFSREQ);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Nfs timer routine
|
|
* Scan the nfsreq list and retranmit any requests that have timed out
|
|
* To avoid retransmission attempts on STREAM sockets (in the future) make
|
|
* sure to set the r_retry field to 0 (implies nm_retry == 0).
|
|
*
|
|
* The nfs reqq lock cannot be held while we do the pru_send() because of a
|
|
* lock ordering violation. The NFS client socket callback acquires
|
|
* inp_lock->nfsreq mutex and pru_send acquires inp_lock. So we drop the
|
|
* reqq mutex (and reacquire it after the pru_send()). The req structure
|
|
* (for the rexmit) is prevented from being removed by the R_REXMIT_INPROG flag.
|
|
*/
|
|
void
|
|
nfs_timer(void *arg)
|
|
{
|
|
struct nfsreq *rep;
|
|
struct mbuf *m;
|
|
struct socket *so;
|
|
struct nfsmount *nmp;
|
|
int timeo;
|
|
int error;
|
|
struct timeval now;
|
|
|
|
getmicrouptime(&now);
|
|
mtx_lock(&Giant); /* nfs_down -> tprintf */
|
|
mtx_lock(&nfs_reqq_mtx);
|
|
TAILQ_FOREACH(rep, &nfs_reqq, r_chain) {
|
|
nmp = rep->r_nmp;
|
|
mtx_lock(&rep->r_mtx);
|
|
if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) {
|
|
mtx_unlock(&rep->r_mtx);
|
|
continue;
|
|
} else {
|
|
/*
|
|
* Terminate request if force-unmount in progress.
|
|
* Note that NFS could have vfs_busy'ed the mount,
|
|
* causing the unmount to wait for the mnt_lock, making
|
|
* this bit of logic necessary.
|
|
*/
|
|
if (rep->r_nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF) {
|
|
nfs_softterm(rep);
|
|
mtx_unlock(&rep->r_mtx);
|
|
continue;
|
|
}
|
|
mtx_unlock(&rep->r_mtx);
|
|
}
|
|
if (nfs_sigintr(nmp, rep, rep->r_td))
|
|
continue;
|
|
mtx_lock(&nmp->nm_mtx);
|
|
mtx_lock(&rep->r_mtx);
|
|
if (nmp->nm_tprintf_initial_delay != 0 &&
|
|
(rep->r_rexmit > 2 || (rep->r_flags & R_RESENDERR)) &&
|
|
rep->r_lastmsg + nmp->nm_tprintf_delay < now.tv_sec) {
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
rep->r_lastmsg = now.tv_sec;
|
|
nfs_down(rep, nmp, rep->r_td, "not responding",
|
|
0, NFSSTA_TIMEO);
|
|
mtx_lock(&nmp->nm_mtx);
|
|
mtx_lock(&rep->r_mtx);
|
|
}
|
|
if (rep->r_rtt >= 0) {
|
|
rep->r_rtt++;
|
|
if (nmp->nm_flag & NFSMNT_DUMBTIMR)
|
|
timeo = nmp->nm_timeo;
|
|
else
|
|
timeo = nfs_estimate_rto(nmp, rep->r_procnum);
|
|
if (nmp->nm_timeouts > 0)
|
|
timeo *= nfs_backoff[nmp->nm_timeouts - 1];
|
|
if (rep->r_rtt <= timeo) {
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
continue;
|
|
}
|
|
if (nmp->nm_timeouts < NFS_NBACKOFF)
|
|
nmp->nm_timeouts++;
|
|
}
|
|
if (rep->r_rexmit >= rep->r_retry) { /* too many */
|
|
nfsstats.rpctimeouts++;
|
|
nfs_softterm(rep);
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
continue;
|
|
}
|
|
if (nmp->nm_sotype != SOCK_DGRAM) {
|
|
if (++rep->r_rexmit > NFS_MAXREXMIT)
|
|
rep->r_rexmit = NFS_MAXREXMIT;
|
|
/*
|
|
* For NFS/TCP, setting R_MUSTRESEND and waking up
|
|
* the requester will cause the request to be
|
|
* retransmitted (in nfs_reply()), re-connecting
|
|
* if necessary.
|
|
*/
|
|
rep->r_flags |= R_MUSTRESEND;
|
|
wakeup((caddr_t)rep);
|
|
rep->r_rtt = 0;
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
continue;
|
|
}
|
|
if ((so = nmp->nm_so) == NULL) {
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
continue;
|
|
}
|
|
/*
|
|
* If there is enough space and the window allows..
|
|
* Resend it
|
|
* Set r_rtt to -1 in case we fail to send it now.
|
|
*/
|
|
rep->r_rtt = -1;
|
|
if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
|
|
((nmp->nm_flag & NFSMNT_DUMBTIMR) || (rep->r_flags & R_SENT) ||
|
|
nmp->nm_sent < nmp->nm_cwnd)) {
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
if ((m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))) {
|
|
/*
|
|
* Mark the request to indicate that a XMIT is in
|
|
* progress to prevent the req structure being
|
|
* removed in nfs_request().
|
|
*/
|
|
mtx_lock(&rep->r_mtx);
|
|
rep->r_flags |= R_REXMIT_INPROG;
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&nfs_reqq_mtx);
|
|
NET_LOCK_GIANT();
|
|
if ((nmp->nm_flag & NFSMNT_NOCONN) == 0)
|
|
error = (*so->so_proto->pr_usrreqs->pru_send)
|
|
(so, 0, m, NULL, NULL, curthread);
|
|
else
|
|
error = (*so->so_proto->pr_usrreqs->pru_send)
|
|
(so, 0, m, nmp->nm_nam, NULL,
|
|
curthread);
|
|
NET_UNLOCK_GIANT();
|
|
mtx_lock(&nfs_reqq_mtx);
|
|
mtx_lock(&nmp->nm_mtx);
|
|
mtx_lock(&rep->r_mtx);
|
|
rep->r_flags &= ~R_REXMIT_INPROG;
|
|
wakeup((caddr_t)&rep->r_flags);
|
|
if (error) {
|
|
if (NFSIGNORE_SOERROR(nmp->nm_soflags, error))
|
|
so->so_error = 0;
|
|
rep->r_flags |= R_RESENDERR;
|
|
} else {
|
|
/*
|
|
* Iff first send, start timing
|
|
* else turn timing off, backoff timer
|
|
* and divide congestion window by 2.
|
|
*/
|
|
rep->r_flags &= ~R_RESENDERR;
|
|
if (rep->r_flags & R_SENT) {
|
|
rep->r_flags &= ~R_TIMING;
|
|
if (++rep->r_rexmit > NFS_MAXREXMIT)
|
|
rep->r_rexmit = NFS_MAXREXMIT;
|
|
nmp->nm_cwnd >>= 1;
|
|
if (nmp->nm_cwnd < NFS_CWNDSCALE)
|
|
nmp->nm_cwnd = NFS_CWNDSCALE;
|
|
nfsstats.rpcretries++;
|
|
} else {
|
|
rep->r_flags |= R_SENT;
|
|
nmp->nm_sent += NFS_CWNDSCALE;
|
|
}
|
|
rep->r_rtt = 0;
|
|
}
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
}
|
|
} else {
|
|
mtx_unlock(&rep->r_mtx);
|
|
mtx_unlock(&nmp->nm_mtx);
|
|
}
|
|
}
|
|
mtx_unlock(&nfs_reqq_mtx);
|
|
mtx_unlock(&Giant); /* nfs_down -> tprintf */
|
|
callout_reset(&nfs_callout, nfs_ticks, nfs_timer, NULL);
|
|
}
|
|
|
|
/*
|
|
* Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
|
|
* wait for all requests to complete. This is used by forced unmounts
|
|
* to terminate any outstanding RPCs.
|
|
*/
|
|
int
|
|
nfs_nmcancelreqs(nmp)
|
|
struct nfsmount *nmp;
|
|
{
|
|
struct nfsreq *req;
|
|
int i;
|
|
|
|
mtx_lock(&nfs_reqq_mtx);
|
|
TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
|
|
mtx_lock(&req->r_mtx);
|
|
if (nmp != req->r_nmp || req->r_mrep != NULL ||
|
|
(req->r_flags & R_SOFTTERM)) {
|
|
mtx_unlock(&req->r_mtx);
|
|
continue;
|
|
}
|
|
nfs_softterm(req);
|
|
mtx_unlock(&req->r_mtx);
|
|
}
|
|
mtx_unlock(&nfs_reqq_mtx);
|
|
|
|
for (i = 0; i < 30; i++) {
|
|
mtx_lock(&nfs_reqq_mtx);
|
|
TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
|
|
if (nmp == req->r_nmp)
|
|
break;
|
|
}
|
|
mtx_unlock(&nfs_reqq_mtx);
|
|
if (req == NULL)
|
|
return (0);
|
|
mtx_lock(&Giant);
|
|
tsleep(&lbolt, PSOCK, "nfscancel", 0);
|
|
mtx_unlock(&Giant);
|
|
}
|
|
return (EBUSY);
|
|
}
|
|
|
|
/*
|
|
* Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT).
|
|
* The nm_send count is decremented now to avoid deadlocks when the process in
|
|
* soreceive() hasn't yet managed to send its own request.
|
|
*/
|
|
|
|
static void
|
|
nfs_softterm(struct nfsreq *rep)
|
|
{
|
|
KASSERT(mtx_owned(&rep->r_mtx), ("NFS req lock not owned !"));
|
|
rep->r_flags |= R_SOFTTERM;
|
|
if (rep->r_flags & R_SENT) {
|
|
rep->r_nmp->nm_sent -= NFS_CWNDSCALE;
|
|
rep->r_flags &= ~R_SENT;
|
|
}
|
|
/*
|
|
* Request terminated, wakeup the blocked process, so that we
|
|
* can return EINTR back.
|
|
*/
|
|
wakeup((caddr_t)rep);
|
|
}
|
|
|
|
/*
|
|
* Any signal that can interrupt an NFS operation in an intr mount
|
|
* should be added to this set. SIGSTOP and SIGKILL cannot be masked.
|
|
*/
|
|
int nfs_sig_set[] = {
|
|
SIGINT,
|
|
SIGTERM,
|
|
SIGHUP,
|
|
SIGKILL,
|
|
SIGSTOP,
|
|
SIGQUIT
|
|
};
|
|
|
|
/*
|
|
* Check to see if one of the signals in our subset is pending on
|
|
* the process (in an intr mount).
|
|
*/
|
|
static int
|
|
nfs_sig_pending(sigset_t set)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0 ; i < sizeof(nfs_sig_set)/sizeof(int) ; i++)
|
|
if (SIGISMEMBER(set, nfs_sig_set[i]))
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* The set/restore sigmask functions are used to (temporarily) overwrite
|
|
* the process p_sigmask during an RPC call (for example). These are also
|
|
* used in other places in the NFS client that might tsleep().
|
|
*/
|
|
void
|
|
nfs_set_sigmask(struct thread *td, sigset_t *oldset)
|
|
{
|
|
sigset_t newset;
|
|
int i;
|
|
struct proc *p;
|
|
|
|
SIGFILLSET(newset);
|
|
if (td == NULL)
|
|
td = curthread; /* XXX */
|
|
p = td->td_proc;
|
|
/* Remove the NFS set of signals from newset */
|
|
PROC_LOCK(p);
|
|
mtx_lock(&p->p_sigacts->ps_mtx);
|
|
for (i = 0 ; i < sizeof(nfs_sig_set)/sizeof(int) ; i++) {
|
|
/*
|
|
* But make sure we leave the ones already masked
|
|
* by the process, ie. remove the signal from the
|
|
* temporary signalmask only if it wasn't already
|
|
* in p_sigmask.
|
|
*/
|
|
if (!SIGISMEMBER(td->td_sigmask, nfs_sig_set[i]) &&
|
|
!SIGISMEMBER(p->p_sigacts->ps_sigignore, nfs_sig_set[i]))
|
|
SIGDELSET(newset, nfs_sig_set[i]);
|
|
}
|
|
mtx_unlock(&p->p_sigacts->ps_mtx);
|
|
PROC_UNLOCK(p);
|
|
kern_sigprocmask(td, SIG_SETMASK, &newset, oldset, 0);
|
|
}
|
|
|
|
void
|
|
nfs_restore_sigmask(struct thread *td, sigset_t *set)
|
|
{
|
|
if (td == NULL)
|
|
td = curthread; /* XXX */
|
|
kern_sigprocmask(td, SIG_SETMASK, set, NULL, 0);
|
|
}
|
|
|
|
/*
|
|
* NFS wrapper to msleep(), that shoves a new p_sigmask and restores the
|
|
* old one after msleep() returns.
|
|
*/
|
|
int
|
|
nfs_msleep(struct thread *td, void *ident, struct mtx *mtx, int priority, char *wmesg, int timo)
|
|
{
|
|
sigset_t oldset;
|
|
int error;
|
|
struct proc *p;
|
|
|
|
if ((priority & PCATCH) == 0)
|
|
return msleep(ident, mtx, priority, wmesg, timo);
|
|
if (td == NULL)
|
|
td = curthread; /* XXX */
|
|
nfs_set_sigmask(td, &oldset);
|
|
error = msleep(ident, mtx, priority, wmesg, timo);
|
|
nfs_restore_sigmask(td, &oldset);
|
|
p = td->td_proc;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Test for a termination condition pending on the process.
|
|
* This is used for NFSMNT_INT mounts.
|
|
*/
|
|
int
|
|
nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td)
|
|
{
|
|
struct proc *p;
|
|
sigset_t tmpset;
|
|
int error = 0;
|
|
|
|
if ((nmp->nm_flag & NFSMNT_NFSV4) != 0)
|
|
return nfs4_sigintr(nmp, rep, td);
|
|
if (rep) {
|
|
mtx_lock(&rep->r_mtx);
|
|
if (rep->r_flags & R_SOFTTERM) {
|
|
mtx_unlock(&rep->r_mtx);
|
|
error = EIO;
|
|
goto out;
|
|
} else
|
|
mtx_unlock(&rep->r_mtx);
|
|
}
|
|
/* Terminate all requests while attempting a forced unmount. */
|
|
if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF) {
|
|
error = EIO;
|
|
goto out;
|
|
}
|
|
if (!(nmp->nm_flag & NFSMNT_INT))
|
|
goto out;
|
|
if (td == NULL)
|
|
return (0);
|
|
p = td->td_proc;
|
|
PROC_LOCK(p);
|
|
tmpset = p->p_siglist;
|
|
SIGSETOR(tmpset, td->td_siglist);
|
|
SIGSETNAND(tmpset, td->td_sigmask);
|
|
mtx_lock(&p->p_sigacts->ps_mtx);
|
|
SIGSETNAND(tmpset, p->p_sigacts->ps_sigignore);
|
|
mtx_unlock(&p->p_sigacts->ps_mtx);
|
|
if ((SIGNOTEMPTY(p->p_siglist) || SIGNOTEMPTY(td->td_siglist))
|
|
&& nfs_sig_pending(tmpset)) {
|
|
PROC_UNLOCK(p);
|
|
return (EINTR);
|
|
}
|
|
PROC_UNLOCK(p);
|
|
|
|
return (0);
|
|
out:
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Lock a socket against others.
|
|
* Necessary for STREAM sockets to ensure you get an entire rpc request/reply
|
|
* and also to avoid race conditions between the processes with nfs requests
|
|
* in progress when a reconnect is necessary.
|
|
*/
|
|
int
|
|
nfs_sndlock(struct nfsreq *rep)
|
|
{
|
|
int *statep = &rep->r_nmp->nm_state;
|
|
struct thread *td;
|
|
int error, slpflag = 0, slptimeo = 0;
|
|
|
|
td = rep->r_td;
|
|
mtx_lock(&rep->r_nmp->nm_mtx);
|
|
if (rep->r_nmp->nm_flag & NFSMNT_INT)
|
|
slpflag = PCATCH;
|
|
while (*statep & NFSSTA_SNDLOCK) {
|
|
error = nfs_sigintr(rep->r_nmp, rep, td);
|
|
if (error) {
|
|
mtx_unlock(&rep->r_nmp->nm_mtx);
|
|
return (error);
|
|
}
|
|
*statep |= NFSSTA_WANTSND;
|
|
(void) msleep(statep, &rep->r_nmp->nm_mtx,
|
|
slpflag | (PZERO - 1), "nfsndlck", slptimeo);
|
|
if (slpflag == PCATCH) {
|
|
slpflag = 0;
|
|
slptimeo = 2 * hz;
|
|
}
|
|
}
|
|
*statep |= NFSSTA_SNDLOCK;
|
|
mtx_unlock(&rep->r_nmp->nm_mtx);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Unlock the stream socket for others.
|
|
*/
|
|
void
|
|
nfs_sndunlock(struct nfsreq *rep)
|
|
{
|
|
int *statep = &rep->r_nmp->nm_state;
|
|
|
|
mtx_lock(&rep->r_nmp->nm_mtx);
|
|
if ((*statep & NFSSTA_SNDLOCK) == 0)
|
|
panic("nfs sndunlock");
|
|
*statep &= ~NFSSTA_SNDLOCK;
|
|
if (*statep & NFSSTA_WANTSND) {
|
|
*statep &= ~NFSSTA_WANTSND;
|
|
wakeup(statep);
|
|
}
|
|
mtx_unlock(&rep->r_nmp->nm_mtx);
|
|
}
|
|
|
|
/*
|
|
* nfs_realign:
|
|
*
|
|
* Check for badly aligned mbuf data and realign by copying the unaligned
|
|
* portion of the data into a new mbuf chain and freeing the portions
|
|
* of the old chain that were replaced.
|
|
*
|
|
* We cannot simply realign the data within the existing mbuf chain
|
|
* because the underlying buffers may contain other rpc commands and
|
|
* we cannot afford to overwrite them.
|
|
*
|
|
* We would prefer to avoid this situation entirely. The situation does
|
|
* not occur with NFS/UDP and is supposed to only occassionally occur
|
|
* with TCP. Use vfs.nfs.realign_count and realign_test to check this.
|
|
*
|
|
*/
|
|
static int
|
|
nfs_realign(struct mbuf **pm, int hsiz)
|
|
{
|
|
struct mbuf *m;
|
|
struct mbuf *n = NULL;
|
|
int off = 0;
|
|
|
|
++nfs_realign_test;
|
|
while ((m = *pm) != NULL) {
|
|
if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) {
|
|
MGET(n, M_DONTWAIT, MT_DATA);
|
|
if (n == NULL)
|
|
return (ENOMEM);
|
|
if (m->m_len >= MINCLSIZE) {
|
|
MCLGET(n, M_DONTWAIT);
|
|
if (n->m_ext.ext_buf == NULL) {
|
|
m_freem(n);
|
|
return (ENOMEM);
|
|
}
|
|
}
|
|
n->m_len = 0;
|
|
break;
|
|
}
|
|
pm = &m->m_next;
|
|
}
|
|
/*
|
|
* If n is non-NULL, loop on m copying data, then replace the
|
|
* portion of the chain that had to be realigned.
|
|
*/
|
|
if (n != NULL) {
|
|
++nfs_realign_count;
|
|
while (m) {
|
|
m_copyback(n, off, m->m_len, mtod(m, caddr_t));
|
|
off += m->m_len;
|
|
m = m->m_next;
|
|
}
|
|
m_freem(*pm);
|
|
*pm = n;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
|
|
static int
|
|
nfs_msg(struct thread *td, const char *server, const char *msg, int error)
|
|
{
|
|
struct proc *p;
|
|
|
|
GIANT_REQUIRED; /* tprintf */
|
|
|
|
p = td ? td->td_proc : NULL;
|
|
if (error) {
|
|
tprintf(p, LOG_INFO, "nfs server %s: %s, error %d\n", server,
|
|
msg, error);
|
|
} else {
|
|
tprintf(p, LOG_INFO, "nfs server %s: %s\n", server, msg);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
nfs_down(rep, nmp, td, msg, error, flags)
|
|
struct nfsreq *rep;
|
|
struct nfsmount *nmp;
|
|
struct thread *td;
|
|
const char *msg;
|
|
int error, flags;
|
|
{
|
|
|
|
GIANT_REQUIRED; /* nfs_msg */
|
|
|
|
if (nmp == NULL)
|
|
return;
|
|
if ((flags & NFSSTA_TIMEO) && !(nmp->nm_state & NFSSTA_TIMEO)) {
|
|
vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
|
|
VQ_NOTRESP, 0);
|
|
nmp->nm_state |= NFSSTA_TIMEO;
|
|
}
|
|
#ifdef NFSSTA_LOCKTIMEO
|
|
if ((flags & NFSSTA_LOCKTIMEO) && !(nmp->nm_state & NFSSTA_LOCKTIMEO)) {
|
|
vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
|
|
VQ_NOTRESPLOCK, 0);
|
|
nmp->nm_state |= NFSSTA_LOCKTIMEO;
|
|
}
|
|
#endif
|
|
mtx_lock(&rep->r_mtx);
|
|
if (rep)
|
|
rep->r_flags |= R_TPRINTFMSG;
|
|
mtx_unlock(&rep->r_mtx);
|
|
nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, error);
|
|
}
|
|
|
|
void
|
|
nfs_up(rep, nmp, td, msg, flags)
|
|
struct nfsreq *rep;
|
|
struct nfsmount *nmp;
|
|
struct thread *td;
|
|
const char *msg;
|
|
int flags;
|
|
{
|
|
|
|
GIANT_REQUIRED; /* nfs_msg */
|
|
|
|
if (nmp == NULL)
|
|
return;
|
|
mtx_lock(&rep->r_mtx);
|
|
if ((rep == NULL) || (rep->r_flags & R_TPRINTFMSG) != 0)
|
|
nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, 0);
|
|
mtx_unlock(&rep->r_mtx);
|
|
if ((flags & NFSSTA_TIMEO) && (nmp->nm_state & NFSSTA_TIMEO)) {
|
|
nmp->nm_state &= ~NFSSTA_TIMEO;
|
|
vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
|
|
VQ_NOTRESP, 1);
|
|
}
|
|
#ifdef NFSSTA_LOCKTIMEO
|
|
if ((flags & NFSSTA_LOCKTIMEO) && (nmp->nm_state & NFSSTA_LOCKTIMEO)) {
|
|
nmp->nm_state &= ~NFSSTA_LOCKTIMEO;
|
|
vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
|
|
VQ_NOTRESPLOCK, 1);
|
|
}
|
|
#endif
|
|
}
|