The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/nfsclient/nfs_krpc.c

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    1 /*-
    2  * Copyright (c) 1989, 1991, 1993, 1995
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)nfs_socket.c        8.5 (Berkeley) 3/30/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/10.3/sys/nfsclient/nfs_krpc.c 247116 2013-02-21 19:02:50Z jhb $");
   37 
   38 /*
   39  * Socket operations for use by nfs
   40  */
   41 
   42 #include "opt_inet6.h"
   43 #include "opt_kdtrace.h"
   44 #include "opt_kgssapi.h"
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/kernel.h>
   49 #include <sys/limits.h>
   50 #include <sys/lock.h>
   51 #include <sys/malloc.h>
   52 #include <sys/mbuf.h>
   53 #include <sys/mount.h>
   54 #include <sys/mutex.h>
   55 #include <sys/proc.h>
   56 #include <sys/signalvar.h>
   57 #include <sys/syscallsubr.h>
   58 #include <sys/sysctl.h>
   59 #include <sys/syslog.h>
   60 #include <sys/vnode.h>
   61 
   62 #include <rpc/rpc.h>
   63 
   64 #include <nfs/nfsproto.h>
   65 #include <nfsclient/nfs.h>
   66 #include <nfs/xdr_subs.h>
   67 #include <nfsclient/nfsm_subs.h>
   68 #include <nfsclient/nfsmount.h>
   69 #include <nfsclient/nfsnode.h>
   70 
   71 #ifdef KDTRACE_HOOKS
   72 #include <sys/dtrace_bsd.h>
   73 
   74 dtrace_nfsclient_nfs23_start_probe_func_t
   75     dtrace_nfsclient_nfs23_start_probe;
   76 
   77 dtrace_nfsclient_nfs23_done_probe_func_t
   78     dtrace_nfsclient_nfs23_done_probe;
   79 
   80 /*
   81  * Registered probes by RPC type.
   82  */
   83 uint32_t        nfsclient_nfs2_start_probes[NFS_NPROCS];
   84 uint32_t        nfsclient_nfs2_done_probes[NFS_NPROCS];
   85 
   86 uint32_t        nfsclient_nfs3_start_probes[NFS_NPROCS];
   87 uint32_t        nfsclient_nfs3_done_probes[NFS_NPROCS];
   88 #endif
   89 
   90 static int      nfs_bufpackets = 4;
   91 static int      nfs_reconnects;
   92 static int      nfs3_jukebox_delay = 10;
   93 static int      nfs_skip_wcc_data_onerr = 1;
   94 static int      fake_wchan;
   95 
   96 SYSCTL_DECL(_vfs_oldnfs);
   97 
   98 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0,
   99     "Buffer reservation size 2 < x < 64");
  100 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, reconnects, CTLFLAG_RD, &nfs_reconnects, 0,
  101     "Number of times the nfs client has had to reconnect");
  102 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfs3_jukebox_delay, CTLFLAG_RW,
  103     &nfs3_jukebox_delay, 0,
  104     "Number of seconds to delay a retry after receiving EJUKEBOX");
  105 SYSCTL_INT(_vfs_oldnfs, OID_AUTO, skip_wcc_data_onerr, CTLFLAG_RW,
  106     &nfs_skip_wcc_data_onerr, 0,
  107     "Disable weak cache consistency checking when server returns an error");
  108 
  109 static void     nfs_down(struct nfsmount *, struct thread *, const char *,
  110     int, int);
  111 static void     nfs_up(struct nfsmount *, struct thread *, const char *,
  112     int, int);
  113 static int      nfs_msg(struct thread *, const char *, const char *, int);
  114 
  115 extern int nfsv2_procid[];
  116 
  117 struct nfs_cached_auth {
  118         int             ca_refs; /* refcount, including 1 from the cache */
  119         uid_t           ca_uid;  /* uid that corresponds to this auth */
  120         AUTH            *ca_auth; /* RPC auth handle */
  121 };
  122 
  123 /*
  124  * RTT estimator
  125  */
  126 
  127 static enum nfs_rto_timer_t nfs_proct[NFS_NPROCS] = {
  128         NFS_DEFAULT_TIMER,      /* NULL */
  129         NFS_GETATTR_TIMER,      /* GETATTR */
  130         NFS_DEFAULT_TIMER,      /* SETATTR */
  131         NFS_LOOKUP_TIMER,       /* LOOKUP */
  132         NFS_GETATTR_TIMER,      /* ACCESS */
  133         NFS_READ_TIMER,         /* READLINK */
  134         NFS_READ_TIMER,         /* READ */
  135         NFS_WRITE_TIMER,        /* WRITE */
  136         NFS_DEFAULT_TIMER,      /* CREATE */
  137         NFS_DEFAULT_TIMER,      /* MKDIR */
  138         NFS_DEFAULT_TIMER,      /* SYMLINK */
  139         NFS_DEFAULT_TIMER,      /* MKNOD */
  140         NFS_DEFAULT_TIMER,      /* REMOVE */
  141         NFS_DEFAULT_TIMER,      /* RMDIR */
  142         NFS_DEFAULT_TIMER,      /* RENAME */
  143         NFS_DEFAULT_TIMER,      /* LINK */
  144         NFS_READ_TIMER,         /* READDIR */
  145         NFS_READ_TIMER,         /* READDIRPLUS */
  146         NFS_DEFAULT_TIMER,      /* FSSTAT */
  147         NFS_DEFAULT_TIMER,      /* FSINFO */
  148         NFS_DEFAULT_TIMER,      /* PATHCONF */
  149         NFS_DEFAULT_TIMER,      /* COMMIT */
  150         NFS_DEFAULT_TIMER,      /* NOOP */
  151 };
  152 
  153 /*
  154  * Choose the correct RTT timer for this NFS procedure.
  155  */
  156 static inline enum nfs_rto_timer_t
  157 nfs_rto_timer(u_int32_t procnum)
  158 {
  159 
  160         return (nfs_proct[procnum]);
  161 }
  162 
  163 /*
  164  * Initialize the RTT estimator state for a new mount point.
  165  */
  166 static void
  167 nfs_init_rtt(struct nfsmount *nmp)
  168 {
  169         int i;
  170 
  171         for (i = 0; i < NFS_MAX_TIMER; i++) {
  172                 nmp->nm_timers[i].rt_srtt = hz;
  173                 nmp->nm_timers[i].rt_deviate = 0;
  174                 nmp->nm_timers[i].rt_rtxcur = hz;
  175         }
  176 }
  177 
  178 /*
  179  * Initialize sockets and congestion for a new NFS connection.
  180  * We do not free the sockaddr if error.
  181  */
  182 int
  183 nfs_connect(struct nfsmount *nmp)
  184 {
  185         int rcvreserve, sndreserve;
  186         int pktscale;
  187         struct sockaddr *saddr;
  188         struct ucred *origcred;
  189         struct thread *td = curthread;
  190         CLIENT *client;
  191         struct netconfig *nconf;
  192         rpcvers_t vers;
  193         int one = 1, retries;
  194         struct timeval timo;
  195 
  196         /*
  197          * We need to establish the socket using the credentials of
  198          * the mountpoint.  Some parts of this process (such as
  199          * sobind() and soconnect()) will use the curent thread's
  200          * credential instead of the socket credential.  To work
  201          * around this, temporarily change the current thread's
  202          * credential to that of the mountpoint.
  203          *
  204          * XXX: It would be better to explicitly pass the correct
  205          * credential to sobind() and soconnect().
  206          */
  207         origcred = td->td_ucred;
  208         td->td_ucred = nmp->nm_mountp->mnt_cred;
  209         saddr = nmp->nm_nam;
  210 
  211         vers = NFS_VER2;
  212         if (nmp->nm_flag & NFSMNT_NFSV3)
  213                 vers = NFS_VER3;
  214         else if (nmp->nm_flag & NFSMNT_NFSV4)
  215                 vers = NFS_VER4;
  216         if (saddr->sa_family == AF_INET)
  217                 if (nmp->nm_sotype == SOCK_DGRAM)
  218                         nconf = getnetconfigent("udp");
  219                 else
  220                         nconf = getnetconfigent("tcp");
  221         else
  222                 if (nmp->nm_sotype == SOCK_DGRAM)
  223                         nconf = getnetconfigent("udp6");
  224                 else
  225                         nconf = getnetconfigent("tcp6");
  226 
  227         /*
  228          * Get buffer reservation size from sysctl, but impose reasonable
  229          * limits.
  230          */
  231         pktscale = nfs_bufpackets;
  232         if (pktscale < 2)
  233                 pktscale = 2;
  234         if (pktscale > 64)
  235                 pktscale = 64;
  236         mtx_lock(&nmp->nm_mtx);
  237         if (nmp->nm_sotype == SOCK_DGRAM) {
  238                 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
  239                 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
  240                     NFS_MAXPKTHDR) * pktscale;
  241         } else if (nmp->nm_sotype == SOCK_SEQPACKET) {
  242                 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
  243                 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
  244                     NFS_MAXPKTHDR) * pktscale;
  245         } else {
  246                 if (nmp->nm_sotype != SOCK_STREAM)
  247                         panic("nfscon sotype");
  248                 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR +
  249                     sizeof (u_int32_t)) * pktscale;
  250                 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR +
  251                     sizeof (u_int32_t)) * pktscale;
  252         }
  253         mtx_unlock(&nmp->nm_mtx);
  254 
  255         client = clnt_reconnect_create(nconf, saddr, NFS_PROG, vers,
  256             sndreserve, rcvreserve);
  257         CLNT_CONTROL(client, CLSET_WAITCHAN, "nfsreq");
  258         if (nmp->nm_flag & NFSMNT_INT)
  259                 CLNT_CONTROL(client, CLSET_INTERRUPTIBLE, &one);
  260         if (nmp->nm_flag & NFSMNT_RESVPORT)
  261                 CLNT_CONTROL(client, CLSET_PRIVPORT, &one);
  262         if ((nmp->nm_flag & NFSMNT_SOFT) != 0) {
  263                 if (nmp->nm_sotype == SOCK_DGRAM)
  264                         /*
  265                          * For UDP, the large timeout for a reconnect will
  266                          * be set to "nm_retry * nm_timeo / 2", so we only
  267                          * want to do 2 reconnect timeout retries.
  268                          */
  269                         retries = 2;
  270                 else
  271                         retries = nmp->nm_retry;
  272         } else
  273                 retries = INT_MAX;
  274         CLNT_CONTROL(client, CLSET_RETRIES, &retries);
  275 
  276         /*
  277          * For UDP, there are 2 timeouts:
  278          * - CLSET_RETRY_TIMEOUT sets the initial timeout for the timer
  279          *   that does a retransmit of an RPC request using the same socket
  280          *   and xid. This is what you normally want to do, since NFS
  281          *   servers depend on "same xid" for their Duplicate Request Cache.
  282          * - timeout specified in CLNT_CALL_MBUF(), which specifies when
  283          *   retransmits on the same socket should fail and a fresh socket
  284          *   created. Each of these timeouts counts as one CLSET_RETRIES,
  285          *   as set above.
  286          * Set the initial retransmit timeout for UDP. This timeout doesn't
  287          * exist for TCP and the following call just fails, which is ok.
  288          */
  289         timo.tv_sec = nmp->nm_timeo / NFS_HZ;
  290         timo.tv_usec = (nmp->nm_timeo % NFS_HZ) * 1000000 / NFS_HZ;
  291         CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, &timo);
  292 
  293         mtx_lock(&nmp->nm_mtx);
  294         if (nmp->nm_client) {
  295                 /*
  296                  * Someone else already connected.
  297                  */
  298                 CLNT_RELEASE(client);
  299         } else
  300                 nmp->nm_client = client;
  301 
  302         /*
  303          * Protocols that do not require connections may be optionally left
  304          * unconnected for servers that reply from a port other than NFS_PORT.
  305          */
  306         if (!(nmp->nm_flag & NFSMNT_NOCONN)) {
  307                 mtx_unlock(&nmp->nm_mtx);
  308                 CLNT_CONTROL(client, CLSET_CONNECT, &one);
  309         } else
  310                 mtx_unlock(&nmp->nm_mtx);
  311 
  312         /* Restore current thread's credentials. */
  313         td->td_ucred = origcred;
  314 
  315         mtx_lock(&nmp->nm_mtx);
  316         /* Initialize other non-zero congestion variables. */
  317         nfs_init_rtt(nmp);
  318         mtx_unlock(&nmp->nm_mtx);
  319         return (0);
  320 }
  321 
  322 /*
  323  * NFS disconnect.  Clean up and unlink.
  324  */
  325 void
  326 nfs_disconnect(struct nfsmount *nmp)
  327 {
  328         CLIENT *client;
  329 
  330         mtx_lock(&nmp->nm_mtx);
  331         if (nmp->nm_client) {
  332                 client = nmp->nm_client;
  333                 nmp->nm_client = NULL;
  334                 mtx_unlock(&nmp->nm_mtx);
  335                 rpc_gss_secpurge_call(client);
  336                 CLNT_CLOSE(client);
  337                 CLNT_RELEASE(client);
  338         } else
  339                 mtx_unlock(&nmp->nm_mtx);
  340 }
  341 
  342 void
  343 nfs_safedisconnect(struct nfsmount *nmp)
  344 {
  345 
  346         nfs_disconnect(nmp);
  347 }
  348 
  349 static AUTH *
  350 nfs_getauth(struct nfsmount *nmp, struct ucred *cred)
  351 {
  352         rpc_gss_service_t svc;
  353         AUTH *auth;
  354 
  355         switch (nmp->nm_secflavor) {
  356         case RPCSEC_GSS_KRB5:
  357         case RPCSEC_GSS_KRB5I:
  358         case RPCSEC_GSS_KRB5P:
  359                 if (!nmp->nm_mech_oid)
  360                         if (!rpc_gss_mech_to_oid_call("kerberosv5",
  361                             &nmp->nm_mech_oid))
  362                                 return (NULL);
  363                 if (nmp->nm_secflavor == RPCSEC_GSS_KRB5)
  364                         svc = rpc_gss_svc_none;
  365                 else if (nmp->nm_secflavor == RPCSEC_GSS_KRB5I)
  366                         svc = rpc_gss_svc_integrity;
  367                 else
  368                         svc = rpc_gss_svc_privacy;
  369                 auth = rpc_gss_secfind_call(nmp->nm_client, cred,
  370                     nmp->nm_principal, nmp->nm_mech_oid, svc);
  371                 if (auth)
  372                         return (auth);
  373                 /* fallthrough */
  374         case AUTH_SYS:
  375         default:
  376                 return (authunix_create(cred));
  377 
  378         }
  379 }
  380 
  381 /*
  382  * Callback from the RPC code to generate up/down notifications.
  383  */
  384 
  385 struct nfs_feedback_arg {
  386         struct nfsmount *nf_mount;
  387         int             nf_lastmsg;     /* last tprintf */
  388         int             nf_tprintfmsg;
  389         struct thread   *nf_td;
  390 };
  391 
  392 static void
  393 nfs_feedback(int type, int proc, void *arg)
  394 {
  395         struct nfs_feedback_arg *nf = (struct nfs_feedback_arg *) arg;
  396         struct nfsmount *nmp = nf->nf_mount;
  397         time_t now;
  398 
  399         switch (type) {
  400         case FEEDBACK_REXMIT2:
  401         case FEEDBACK_RECONNECT:
  402                 now = time_uptime;
  403                 if (nf->nf_lastmsg + nmp->nm_tprintf_delay < now) {
  404                         nfs_down(nmp, nf->nf_td,
  405                             "not responding", 0, NFSSTA_TIMEO);
  406                         nf->nf_tprintfmsg = TRUE;
  407                         nf->nf_lastmsg = now;
  408                 }
  409                 break;
  410 
  411         case FEEDBACK_OK:
  412                 nfs_up(nf->nf_mount, nf->nf_td,
  413                     "is alive again", NFSSTA_TIMEO, nf->nf_tprintfmsg);
  414                 break;
  415         }
  416 }
  417 
  418 /*
  419  * nfs_request - goes something like this
  420  *      - fill in request struct
  421  *      - links it into list
  422  *      - calls nfs_send() for first transmit
  423  *      - calls nfs_receive() to get reply
  424  *      - break down rpc header and return with nfs reply pointed to
  425  *        by mrep or error
  426  * nb: always frees up mreq mbuf list
  427  */
  428 int
  429 nfs_request(struct vnode *vp, struct mbuf *mreq, int procnum,
  430     struct thread *td, struct ucred *cred, struct mbuf **mrp,
  431     struct mbuf **mdp, caddr_t *dposp)
  432 {
  433         struct mbuf *mrep;
  434         u_int32_t *tl;
  435         struct nfsmount *nmp;
  436         struct mbuf *md;
  437         time_t waituntil;
  438         caddr_t dpos;
  439         int error = 0, timeo;
  440         AUTH *auth = NULL;
  441         enum nfs_rto_timer_t timer;
  442         struct nfs_feedback_arg nf;
  443         struct rpc_callextra ext;
  444         enum clnt_stat stat;
  445         struct timeval timo;
  446 
  447         /* Reject requests while attempting a forced unmount. */
  448         if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) {
  449                 m_freem(mreq);
  450                 return (ESTALE);
  451         }
  452         nmp = VFSTONFS(vp->v_mount);
  453         bzero(&nf, sizeof(struct nfs_feedback_arg));
  454         nf.nf_mount = nmp;
  455         nf.nf_td = td;
  456         nf.nf_lastmsg = time_uptime -
  457             ((nmp->nm_tprintf_delay) - (nmp->nm_tprintf_initial_delay));
  458 
  459         /*
  460          * XXX if not already connected call nfs_connect now.  Longer
  461          * term, change nfs_mount to call nfs_connect unconditionally
  462          * and let clnt_reconnect_create handle reconnects.
  463          */
  464         if (!nmp->nm_client)
  465                 nfs_connect(nmp);
  466 
  467         auth = nfs_getauth(nmp, cred);
  468         if (!auth) {
  469                 m_freem(mreq);
  470                 return (EACCES);
  471         }
  472         bzero(&ext, sizeof(ext));
  473         ext.rc_auth = auth;
  474 
  475         ext.rc_feedback = nfs_feedback;
  476         ext.rc_feedback_arg = &nf;
  477 
  478         /*
  479          * Use a conservative timeout for RPCs other than getattr,
  480          * lookup, read or write.  The justification for doing "other"
  481          * this way is that these RPCs happen so infrequently that
  482          * timer est. would probably be stale.  Also, since many of
  483          * these RPCs are non-idempotent, a conservative timeout is
  484          * desired.
  485          */
  486         timer = nfs_rto_timer(procnum);
  487         if (timer != NFS_DEFAULT_TIMER)
  488                 ext.rc_timers = &nmp->nm_timers[timer - 1];
  489         else
  490                 ext.rc_timers = NULL;
  491 
  492 #ifdef KDTRACE_HOOKS
  493         if (dtrace_nfsclient_nfs23_start_probe != NULL) {
  494                 uint32_t probe_id;
  495                 int probe_procnum;
  496 
  497                 if (nmp->nm_flag & NFSMNT_NFSV3) {
  498                         probe_id = nfsclient_nfs3_start_probes[procnum];
  499                         probe_procnum = procnum;
  500                 } else {
  501                         probe_id = nfsclient_nfs2_start_probes[procnum];
  502                         probe_procnum = nfsv2_procid[procnum];
  503                 }
  504                 if (probe_id != 0)
  505                         (dtrace_nfsclient_nfs23_start_probe)(probe_id, vp,
  506                             mreq, cred, probe_procnum);
  507         }
  508 #endif
  509 
  510         nfsstats.rpcrequests++;
  511 tryagain:
  512         /*
  513          * This timeout specifies when a new socket should be created,
  514          * along with new xid values. For UDP, this should be done
  515          * infrequently, since retransmits of RPC requests should normally
  516          * use the same xid.
  517          */
  518         if (nmp->nm_sotype == SOCK_DGRAM) {
  519                 if ((nmp->nm_flag & NFSMNT_SOFT) != 0) {
  520                         /*
  521                          * CLSET_RETRIES is set to 2, so this should be half
  522                          * of the total timeout required.
  523                          */
  524                         timeo = nmp->nm_retry * nmp->nm_timeo / 2;
  525                         if (timeo < 1)
  526                                 timeo = 1;
  527                         timo.tv_sec = timeo / NFS_HZ;
  528                         timo.tv_usec = (timeo % NFS_HZ) * 1000000 / NFS_HZ;
  529                 } else {
  530                         /* For UDP hard mounts, use a large value. */
  531                         timo.tv_sec = NFS_MAXTIMEO / NFS_HZ;
  532                         timo.tv_usec = 0;
  533                 }
  534         } else {
  535                 timo.tv_sec = nmp->nm_timeo / NFS_HZ;
  536                 timo.tv_usec = (nmp->nm_timeo % NFS_HZ) * 1000000 / NFS_HZ;
  537         }
  538         mrep = NULL;
  539         stat = CLNT_CALL_MBUF(nmp->nm_client, &ext,
  540             (nmp->nm_flag & NFSMNT_NFSV3) ? procnum : nfsv2_procid[procnum],
  541             mreq, &mrep, timo);
  542 
  543         /*
  544          * If there was a successful reply and a tprintf msg.
  545          * tprintf a response.
  546          */
  547         if (stat == RPC_SUCCESS)
  548                 error = 0;
  549         else if (stat == RPC_TIMEDOUT) {
  550                 nfsstats.rpctimeouts++;
  551                 error = ETIMEDOUT;
  552         } else if (stat == RPC_VERSMISMATCH) {
  553                 nfsstats.rpcinvalid++;
  554                 error = EOPNOTSUPP;
  555         } else if (stat == RPC_PROGVERSMISMATCH) {
  556                 nfsstats.rpcinvalid++;
  557                 error = EPROTONOSUPPORT;
  558         } else if (stat == RPC_INTR) {
  559                 error = EINTR;
  560         } else {
  561                 nfsstats.rpcinvalid++;
  562                 error = EACCES;
  563         }
  564         if (error)
  565                 goto nfsmout;
  566 
  567         KASSERT(mrep != NULL, ("mrep shouldn't be NULL if no error\n"));
  568 
  569         /*
  570          * Search for any mbufs that are not a multiple of 4 bytes long
  571          * or with m_data not longword aligned.
  572          * These could cause pointer alignment problems, so copy them to
  573          * well aligned mbufs.
  574          */
  575         error = nfs_realign(&mrep, M_NOWAIT);
  576         if (error == ENOMEM) {
  577                 m_freem(mrep);
  578                 AUTH_DESTROY(auth);
  579                 nfsstats.rpcinvalid++;
  580                 return (error);
  581         }
  582 
  583         md = mrep;
  584         dpos = mtod(mrep, caddr_t);
  585         tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
  586         if (*tl != 0) {
  587                 error = fxdr_unsigned(int, *tl);
  588                 if ((nmp->nm_flag & NFSMNT_NFSV3) &&
  589                     error == NFSERR_TRYLATER) {
  590                         m_freem(mrep);
  591                         error = 0;
  592                         waituntil = time_second + nfs3_jukebox_delay;
  593                         while (time_second < waituntil)
  594                                 (void)tsleep(&fake_wchan, PSOCK, "nqnfstry",
  595                                     hz);
  596                         goto tryagain;
  597                 }
  598                 /*
  599                  * Make sure NFSERR_RETERR isn't bogusly set by a server
  600                  * such as amd. (No actual NFS error has bit 31 set.)
  601                  */
  602                 error &= ~NFSERR_RETERR;
  603 
  604                 /*
  605                  * If the File Handle was stale, invalidate the lookup
  606                  * cache, just in case.
  607                  */
  608                 if (error == ESTALE)
  609                         nfs_purgecache(vp);
  610                 /*
  611                  * Skip wcc data on non-ENOENT NFS errors for now.
  612                  * NetApp filers return corrupt postop attrs in the
  613                  * wcc data for NFS err EROFS.  Not sure if they could
  614                  * return corrupt postop attrs for others errors.
  615                  * Blocking ENOENT post-op attributes breaks negative
  616                  * name caching, so always allow it through.
  617                  */
  618                 if ((nmp->nm_flag & NFSMNT_NFSV3) &&
  619                     (!nfs_skip_wcc_data_onerr || error == ENOENT)) {
  620                         *mrp = mrep;
  621                         *mdp = md;
  622                         *dposp = dpos;
  623                         error |= NFSERR_RETERR;
  624                 } else
  625                         m_freem(mrep);
  626                 goto nfsmout;
  627         }
  628 
  629 #ifdef KDTRACE_HOOKS
  630         if (dtrace_nfsclient_nfs23_done_probe != NULL) {
  631                 uint32_t probe_id;
  632                 int probe_procnum;
  633 
  634                 if (nmp->nm_flag & NFSMNT_NFSV3) {
  635                         probe_id = nfsclient_nfs3_done_probes[procnum];
  636                         probe_procnum = procnum;
  637                 } else {
  638                         probe_id = nfsclient_nfs2_done_probes[procnum];
  639                         probe_procnum = (nmp->nm_flag & NFSMNT_NFSV3) ?
  640                             procnum : nfsv2_procid[procnum];
  641                 }
  642                 if (probe_id != 0)
  643                         (dtrace_nfsclient_nfs23_done_probe)(probe_id, vp,
  644                             mreq, cred, probe_procnum, 0);
  645         }
  646 #endif
  647         m_freem(mreq);
  648         *mrp = mrep;
  649         *mdp = md;
  650         *dposp = dpos;
  651         AUTH_DESTROY(auth);
  652         return (0);
  653 
  654 nfsmout:
  655 #ifdef KDTRACE_HOOKS
  656         if (dtrace_nfsclient_nfs23_done_probe != NULL) {
  657                 uint32_t probe_id;
  658                 int probe_procnum;
  659 
  660                 if (nmp->nm_flag & NFSMNT_NFSV3) {
  661                         probe_id = nfsclient_nfs3_done_probes[procnum];
  662                         probe_procnum = procnum;
  663                 } else {
  664                         probe_id = nfsclient_nfs2_done_probes[procnum];
  665                         probe_procnum = (nmp->nm_flag & NFSMNT_NFSV3) ?
  666                             procnum : nfsv2_procid[procnum];
  667                 }
  668                 if (probe_id != 0)
  669                         (dtrace_nfsclient_nfs23_done_probe)(probe_id, vp,
  670                             mreq, cred, probe_procnum, error);
  671         }
  672 #endif
  673         m_freem(mreq);
  674         if (auth)
  675                 AUTH_DESTROY(auth);
  676         return (error);
  677 }
  678 
  679 /*
  680  * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
  681  * wait for all requests to complete.  This is used by forced unmounts
  682  * to terminate any outstanding RPCs.
  683  */
  684 int
  685 nfs_nmcancelreqs(struct nfsmount *nmp)
  686 {
  687 
  688         if (nmp->nm_client)
  689                 CLNT_CLOSE(nmp->nm_client);
  690         return (0);
  691 }
  692 
  693 /*
  694  * Any signal that can interrupt an NFS operation in an intr mount
  695  * should be added to this set.  SIGSTOP and SIGKILL cannot be masked.
  696  */
  697 int nfs_sig_set[] = {
  698         SIGINT,
  699         SIGTERM,
  700         SIGHUP,
  701         SIGKILL,
  702         SIGQUIT
  703 };
  704 
  705 /*
  706  * Check to see if one of the signals in our subset is pending on
  707  * the process (in an intr mount).
  708  */
  709 static int
  710 nfs_sig_pending(sigset_t set)
  711 {
  712         int i;
  713 
  714         for (i = 0 ; i < sizeof(nfs_sig_set)/sizeof(int) ; i++)
  715                 if (SIGISMEMBER(set, nfs_sig_set[i]))
  716                         return (1);
  717         return (0);
  718 }
  719 
  720 /*
  721  * The set/restore sigmask functions are used to (temporarily) overwrite
  722  * the thread td_sigmask during an RPC call (for example).  These are also
  723  * used in other places in the NFS client that might tsleep().
  724  */
  725 void
  726 nfs_set_sigmask(struct thread *td, sigset_t *oldset)
  727 {
  728         sigset_t newset;
  729         int i;
  730         struct proc *p;
  731 
  732         SIGFILLSET(newset);
  733         if (td == NULL)
  734                 td = curthread; /* XXX */
  735         p = td->td_proc;
  736         /* Remove the NFS set of signals from newset. */
  737         PROC_LOCK(p);
  738         mtx_lock(&p->p_sigacts->ps_mtx);
  739         for (i = 0 ; i < sizeof(nfs_sig_set)/sizeof(int) ; i++) {
  740                 /*
  741                  * But make sure we leave the ones already masked
  742                  * by the process, i.e. remove the signal from the
  743                  * temporary signalmask only if it wasn't already
  744                  * in p_sigmask.
  745                  */
  746                 if (!SIGISMEMBER(td->td_sigmask, nfs_sig_set[i]) &&
  747                     !SIGISMEMBER(p->p_sigacts->ps_sigignore, nfs_sig_set[i]))
  748                         SIGDELSET(newset, nfs_sig_set[i]);
  749         }
  750         mtx_unlock(&p->p_sigacts->ps_mtx);
  751         kern_sigprocmask(td, SIG_SETMASK, &newset, oldset,
  752             SIGPROCMASK_PROC_LOCKED);
  753         PROC_UNLOCK(p);
  754 }
  755 
  756 void
  757 nfs_restore_sigmask(struct thread *td, sigset_t *set)
  758 {
  759         if (td == NULL)
  760                 td = curthread; /* XXX */
  761         kern_sigprocmask(td, SIG_SETMASK, set, NULL, 0);
  762 }
  763 
  764 /*
  765  * NFS wrapper to msleep(), that shoves a new p_sigmask and restores the
  766  * old one after msleep() returns.
  767  */
  768 int
  769 nfs_msleep(struct thread *td, void *ident, struct mtx *mtx, int priority,
  770     char *wmesg, int timo)
  771 {
  772         sigset_t oldset;
  773         int error;
  774         struct proc *p;
  775 
  776         if ((priority & PCATCH) == 0)
  777                 return msleep(ident, mtx, priority, wmesg, timo);
  778         if (td == NULL)
  779                 td = curthread; /* XXX */
  780         nfs_set_sigmask(td, &oldset);
  781         error = msleep(ident, mtx, priority, wmesg, timo);
  782         nfs_restore_sigmask(td, &oldset);
  783         p = td->td_proc;
  784         return (error);
  785 }
  786 
  787 /*
  788  * Test for a termination condition pending on the process.
  789  * This is used for NFSMNT_INT mounts.
  790  */
  791 int
  792 nfs_sigintr(struct nfsmount *nmp, struct thread *td)
  793 {
  794         struct proc *p;
  795         sigset_t tmpset;
  796 
  797         /* Terminate all requests while attempting a forced unmount. */
  798         if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)
  799                 return (EIO);
  800         if (!(nmp->nm_flag & NFSMNT_INT))
  801                 return (0);
  802         if (td == NULL)
  803                 return (0);
  804         p = td->td_proc;
  805         PROC_LOCK(p);
  806         tmpset = p->p_siglist;
  807         SIGSETOR(tmpset, td->td_siglist);
  808         SIGSETNAND(tmpset, td->td_sigmask);
  809         mtx_lock(&p->p_sigacts->ps_mtx);
  810         SIGSETNAND(tmpset, p->p_sigacts->ps_sigignore);
  811         mtx_unlock(&p->p_sigacts->ps_mtx);
  812         if ((SIGNOTEMPTY(p->p_siglist) || SIGNOTEMPTY(td->td_siglist))
  813             && nfs_sig_pending(tmpset)) {
  814                 PROC_UNLOCK(p);
  815                 return (EINTR);
  816         }
  817         PROC_UNLOCK(p);
  818         return (0);
  819 }
  820 
  821 static int
  822 nfs_msg(struct thread *td, const char *server, const char *msg, int error)
  823 {
  824         struct proc *p;
  825 
  826         p = td ? td->td_proc : NULL;
  827         if (error)
  828                 tprintf(p, LOG_INFO, "nfs server %s: %s, error %d\n", server,
  829                     msg, error);
  830         else
  831                 tprintf(p, LOG_INFO, "nfs server %s: %s\n", server, msg);
  832         return (0);
  833 }
  834 
  835 static void
  836 nfs_down(struct nfsmount *nmp, struct thread *td, const char *msg,
  837     int error, int flags)
  838 {
  839         if (nmp == NULL)
  840                 return;
  841         mtx_lock(&nmp->nm_mtx);
  842         if ((flags & NFSSTA_TIMEO) && !(nmp->nm_state & NFSSTA_TIMEO)) {
  843                 nmp->nm_state |= NFSSTA_TIMEO;
  844                 mtx_unlock(&nmp->nm_mtx);
  845                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
  846                     VQ_NOTRESP, 0);
  847         } else
  848                 mtx_unlock(&nmp->nm_mtx);
  849         mtx_lock(&nmp->nm_mtx);
  850         if ((flags & NFSSTA_LOCKTIMEO) &&
  851             !(nmp->nm_state & NFSSTA_LOCKTIMEO)) {
  852                 nmp->nm_state |= NFSSTA_LOCKTIMEO;
  853                 mtx_unlock(&nmp->nm_mtx);
  854                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
  855                     VQ_NOTRESPLOCK, 0);
  856         } else
  857                 mtx_unlock(&nmp->nm_mtx);
  858         nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, error);
  859 }
  860 
  861 static void
  862 nfs_up(struct nfsmount *nmp, struct thread *td, const char *msg,
  863     int flags, int tprintfmsg)
  864 {
  865         if (nmp == NULL)
  866                 return;
  867         if (tprintfmsg)
  868                 nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, 0);
  869 
  870         mtx_lock(&nmp->nm_mtx);
  871         if ((flags & NFSSTA_TIMEO) && (nmp->nm_state & NFSSTA_TIMEO)) {
  872                 nmp->nm_state &= ~NFSSTA_TIMEO;
  873                 mtx_unlock(&nmp->nm_mtx);
  874                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
  875                     VQ_NOTRESP, 1);
  876         } else
  877                 mtx_unlock(&nmp->nm_mtx);
  878 
  879         mtx_lock(&nmp->nm_mtx);
  880         if ((flags & NFSSTA_LOCKTIMEO) &&
  881             (nmp->nm_state & NFSSTA_LOCKTIMEO)) {
  882                 nmp->nm_state &= ~NFSSTA_LOCKTIMEO;
  883                 mtx_unlock(&nmp->nm_mtx);
  884                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
  885                     VQ_NOTRESPLOCK, 1);
  886         } else
  887                 mtx_unlock(&nmp->nm_mtx);
  888 }

Cache object: c80a1e812f5aa65fb656c3ec5ead13bc


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