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/8.3/sys/nfsclient/nfs_krpc.c 229906 2012-01-10 02:55:43Z rmacklem $");
   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_nfs);
   97 
   98 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0,
   99     "Buffer reservation size 2 < x < 64");
  100 SYSCTL_INT(_vfs_nfs, OID_AUTO, reconnects, CTLFLAG_RD, &nfs_reconnects, 0,
  101     "Number of times the nfs client has had to reconnect");
  102 SYSCTL_INT(_vfs_nfs, 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_nfs, 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         struct timeval now;
  398 
  399         getmicrouptime(&now);
  400 
  401         switch (type) {
  402         case FEEDBACK_REXMIT2:
  403         case FEEDBACK_RECONNECT:
  404                 if (nf->nf_lastmsg + nmp->nm_tprintf_delay < now.tv_sec) {
  405                         nfs_down(nmp, nf->nf_td,
  406                             "not responding", 0, NFSSTA_TIMEO);
  407                         nf->nf_tprintfmsg = TRUE;
  408                         nf->nf_lastmsg = now.tv_sec;
  409                 }
  410                 break;
  411 
  412         case FEEDBACK_OK:
  413                 nfs_up(nf->nf_mount, nf->nf_td,
  414                     "is alive again", NFSSTA_TIMEO, nf->nf_tprintfmsg);
  415                 break;
  416         }
  417 }
  418 
  419 /*
  420  * nfs_request - goes something like this
  421  *      - fill in request struct
  422  *      - links it into list
  423  *      - calls nfs_send() for first transmit
  424  *      - calls nfs_receive() to get reply
  425  *      - break down rpc header and return with nfs reply pointed to
  426  *        by mrep or error
  427  * nb: always frees up mreq mbuf list
  428  */
  429 int
  430 nfs_request(struct vnode *vp, struct mbuf *mreq, int procnum,
  431     struct thread *td, struct ucred *cred, struct mbuf **mrp,
  432     struct mbuf **mdp, caddr_t *dposp)
  433 {
  434         struct mbuf *mrep;
  435         u_int32_t *tl;
  436         struct nfsmount *nmp;
  437         struct mbuf *md;
  438         time_t waituntil;
  439         caddr_t dpos;
  440         int error = 0, timeo;
  441         struct timeval now;
  442         AUTH *auth = NULL;
  443         enum nfs_rto_timer_t timer;
  444         struct nfs_feedback_arg nf;
  445         struct rpc_callextra ext;
  446         enum clnt_stat stat;
  447         struct timeval timo;
  448 
  449         /* Reject requests while attempting a forced unmount. */
  450         if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) {
  451                 m_freem(mreq);
  452                 return (ESTALE);
  453         }
  454         nmp = VFSTONFS(vp->v_mount);
  455         bzero(&nf, sizeof(struct nfs_feedback_arg));
  456         nf.nf_mount = nmp;
  457         nf.nf_td = td;
  458         getmicrouptime(&now);
  459         nf.nf_lastmsg = now.tv_sec -
  460             ((nmp->nm_tprintf_delay) - (nmp->nm_tprintf_initial_delay));
  461 
  462         /*
  463          * XXX if not already connected call nfs_connect now.  Longer
  464          * term, change nfs_mount to call nfs_connect unconditionally
  465          * and let clnt_reconnect_create handle reconnects.
  466          */
  467         if (!nmp->nm_client)
  468                 nfs_connect(nmp);
  469 
  470         auth = nfs_getauth(nmp, cred);
  471         if (!auth) {
  472                 m_freem(mreq);
  473                 return (EACCES);
  474         }
  475         bzero(&ext, sizeof(ext));
  476         ext.rc_auth = auth;
  477 
  478         ext.rc_feedback = nfs_feedback;
  479         ext.rc_feedback_arg = &nf;
  480 
  481         /*
  482          * Use a conservative timeout for RPCs other than getattr,
  483          * lookup, read or write.  The justification for doing "other"
  484          * this way is that these RPCs happen so infrequently that
  485          * timer est. would probably be stale.  Also, since many of
  486          * these RPCs are non-idempotent, a conservative timeout is
  487          * desired.
  488          */
  489         timer = nfs_rto_timer(procnum);
  490         if (timer != NFS_DEFAULT_TIMER)
  491                 ext.rc_timers = &nmp->nm_timers[timer - 1];
  492         else
  493                 ext.rc_timers = NULL;
  494 
  495 #ifdef KDTRACE_HOOKS
  496         if (dtrace_nfsclient_nfs23_start_probe != NULL) {
  497                 uint32_t probe_id;
  498                 int probe_procnum;
  499 
  500                 if (nmp->nm_flag & NFSMNT_NFSV3) {
  501                         probe_id = nfsclient_nfs3_start_probes[procnum];
  502                         probe_procnum = procnum;
  503                 } else {
  504                         probe_id = nfsclient_nfs2_start_probes[procnum];
  505                         probe_procnum = nfsv2_procid[procnum];
  506                 }
  507                 if (probe_id != 0)
  508                         (dtrace_nfsclient_nfs23_start_probe)(probe_id, vp,
  509                             mreq, cred, probe_procnum);
  510         }
  511 #endif
  512 
  513         nfsstats.rpcrequests++;
  514 tryagain:
  515         /*
  516          * This timeout specifies when a new socket should be created,
  517          * along with new xid values. For UDP, this should be done
  518          * infrequently, since retransmits of RPC requests should normally
  519          * use the same xid.
  520          */
  521         if (nmp->nm_sotype == SOCK_DGRAM) {
  522                 if ((nmp->nm_flag & NFSMNT_SOFT) != 0) {
  523                         /*
  524                          * CLSET_RETRIES is set to 2, so this should be half
  525                          * of the total timeout required.
  526                          */
  527                         timeo = nmp->nm_retry * nmp->nm_timeo / 2;
  528                         if (timeo < 1)
  529                                 timeo = 1;
  530                         timo.tv_sec = timeo / NFS_HZ;
  531                         timo.tv_usec = (timeo % NFS_HZ) * 1000000 / NFS_HZ;
  532                 } else {
  533                         /* For UDP hard mounts, use a large value. */
  534                         timo.tv_sec = NFS_MAXTIMEO / NFS_HZ;
  535                         timo.tv_usec = 0;
  536                 }
  537         } else {
  538                 timo.tv_sec = nmp->nm_timeo / NFS_HZ;
  539                 timo.tv_usec = (nmp->nm_timeo % NFS_HZ) * 1000000 / NFS_HZ;
  540         }
  541         mrep = NULL;
  542         stat = CLNT_CALL_MBUF(nmp->nm_client, &ext,
  543             (nmp->nm_flag & NFSMNT_NFSV3) ? procnum : nfsv2_procid[procnum],
  544             mreq, &mrep, timo);
  545 
  546         /*
  547          * If there was a successful reply and a tprintf msg.
  548          * tprintf a response.
  549          */
  550         if (stat == RPC_SUCCESS)
  551                 error = 0;
  552         else if (stat == RPC_TIMEDOUT)
  553                 error = ETIMEDOUT;
  554         else if (stat == RPC_VERSMISMATCH)
  555                 error = EOPNOTSUPP;
  556         else if (stat == RPC_PROGVERSMISMATCH)
  557                 error = EPROTONOSUPPORT;
  558         else
  559                 error = EACCES;
  560         if (error)
  561                 goto nfsmout;
  562 
  563         KASSERT(mrep != NULL, ("mrep shouldn't be NULL if no error\n"));
  564 
  565         /*
  566          * Search for any mbufs that are not a multiple of 4 bytes long
  567          * or with m_data not longword aligned.
  568          * These could cause pointer alignment problems, so copy them to
  569          * well aligned mbufs.
  570          */
  571         error = nfs_realign(&mrep, M_DONTWAIT);
  572         if (error == ENOMEM) {
  573                 m_freem(mrep);
  574                 AUTH_DESTROY(auth);
  575                 return (error);
  576         }
  577 
  578         md = mrep;
  579         dpos = mtod(mrep, caddr_t);
  580         tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
  581         if (*tl != 0) {
  582                 error = fxdr_unsigned(int, *tl);
  583                 if ((nmp->nm_flag & NFSMNT_NFSV3) &&
  584                     error == NFSERR_TRYLATER) {
  585                         m_freem(mrep);
  586                         error = 0;
  587                         waituntil = time_second + nfs3_jukebox_delay;
  588                         while (time_second < waituntil)
  589                                 (void)tsleep(&fake_wchan, PSOCK, "nqnfstry",
  590                                     hz);
  591                         goto tryagain;
  592                 }
  593                 /*
  594                  * Make sure NFSERR_RETERR isn't bogusly set by a server
  595                  * such as amd. (No actual NFS error has bit 31 set.)
  596                  */
  597                 error &= ~NFSERR_RETERR;
  598 
  599                 /*
  600                  * If the File Handle was stale, invalidate the lookup
  601                  * cache, just in case.
  602                  */
  603                 if (error == ESTALE)
  604                         nfs_purgecache(vp);
  605                 /*
  606                  * Skip wcc data on NFS errors for now.  NetApp filers
  607                  * return corrupt postop attrs in the wcc data for NFS
  608                  * err EROFS.  Not sure if they could return corrupt
  609                  * postop attrs for others errors.
  610                  */
  611                 if ((nmp->nm_flag & NFSMNT_NFSV3) &&
  612                     !nfs_skip_wcc_data_onerr) {
  613                         *mrp = mrep;
  614                         *mdp = md;
  615                         *dposp = dpos;
  616                         error |= NFSERR_RETERR;
  617                 } else
  618                         m_freem(mrep);
  619                 goto nfsmout;
  620         }
  621 
  622 #ifdef KDTRACE_HOOKS
  623         if (dtrace_nfsclient_nfs23_done_probe != NULL) {
  624                 uint32_t probe_id;
  625                 int probe_procnum;
  626 
  627                 if (nmp->nm_flag & NFSMNT_NFSV3) {
  628                         probe_id = nfsclient_nfs3_done_probes[procnum];
  629                         probe_procnum = procnum;
  630                 } else {
  631                         probe_id = nfsclient_nfs2_done_probes[procnum];
  632                         probe_procnum = (nmp->nm_flag & NFSMNT_NFSV3) ?
  633                             procnum : nfsv2_procid[procnum];
  634                 }
  635                 if (probe_id != 0)
  636                         (dtrace_nfsclient_nfs23_done_probe)(probe_id, vp,
  637                             mreq, cred, probe_procnum, 0);
  638         }
  639 #endif
  640         m_freem(mreq);
  641         *mrp = mrep;
  642         *mdp = md;
  643         *dposp = dpos;
  644         AUTH_DESTROY(auth);
  645         return (0);
  646 
  647 nfsmout:
  648 #ifdef KDTRACE_HOOKS
  649         if (dtrace_nfsclient_nfs23_done_probe != NULL) {
  650                 uint32_t probe_id;
  651                 int probe_procnum;
  652 
  653                 if (nmp->nm_flag & NFSMNT_NFSV3) {
  654                         probe_id = nfsclient_nfs3_done_probes[procnum];
  655                         probe_procnum = procnum;
  656                 } else {
  657                         probe_id = nfsclient_nfs2_done_probes[procnum];
  658                         probe_procnum = (nmp->nm_flag & NFSMNT_NFSV3) ?
  659                             procnum : nfsv2_procid[procnum];
  660                 }
  661                 if (probe_id != 0)
  662                         (dtrace_nfsclient_nfs23_done_probe)(probe_id, vp,
  663                             mreq, cred, probe_procnum, error);
  664         }
  665 #endif
  666         m_freem(mreq);
  667         if (auth)
  668                 AUTH_DESTROY(auth);
  669         return (error);
  670 }
  671 
  672 /*
  673  * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
  674  * wait for all requests to complete.  This is used by forced unmounts
  675  * to terminate any outstanding RPCs.
  676  */
  677 int
  678 nfs_nmcancelreqs(struct nfsmount *nmp)
  679 {
  680 
  681         if (nmp->nm_client)
  682                 CLNT_CLOSE(nmp->nm_client);
  683         return (0);
  684 }
  685 
  686 /*
  687  * Any signal that can interrupt an NFS operation in an intr mount
  688  * should be added to this set.  SIGSTOP and SIGKILL cannot be masked.
  689  */
  690 int nfs_sig_set[] = {
  691         SIGINT,
  692         SIGTERM,
  693         SIGHUP,
  694         SIGKILL,
  695         SIGSTOP,
  696         SIGQUIT
  697 };
  698 
  699 /*
  700  * Check to see if one of the signals in our subset is pending on
  701  * the process (in an intr mount).
  702  */
  703 static int
  704 nfs_sig_pending(sigset_t set)
  705 {
  706         int i;
  707 
  708         for (i = 0 ; i < sizeof(nfs_sig_set)/sizeof(int) ; i++)
  709                 if (SIGISMEMBER(set, nfs_sig_set[i]))
  710                         return (1);
  711         return (0);
  712 }
  713 
  714 /*
  715  * The set/restore sigmask functions are used to (temporarily) overwrite
  716  * the process p_sigmask during an RPC call (for example).  These are also
  717  * used in other places in the NFS client that might tsleep().
  718  */
  719 void
  720 nfs_set_sigmask(struct thread *td, sigset_t *oldset)
  721 {
  722         sigset_t newset;
  723         int i;
  724         struct proc *p;
  725 
  726         SIGFILLSET(newset);
  727         if (td == NULL)
  728                 td = curthread; /* XXX */
  729         p = td->td_proc;
  730         /* Remove the NFS set of signals from newset. */
  731         PROC_LOCK(p);
  732         mtx_lock(&p->p_sigacts->ps_mtx);
  733         for (i = 0 ; i < sizeof(nfs_sig_set)/sizeof(int) ; i++) {
  734                 /*
  735                  * But make sure we leave the ones already masked
  736                  * by the process, i.e. remove the signal from the
  737                  * temporary signalmask only if it wasn't already
  738                  * in p_sigmask.
  739                  */
  740                 if (!SIGISMEMBER(td->td_sigmask, nfs_sig_set[i]) &&
  741                     !SIGISMEMBER(p->p_sigacts->ps_sigignore, nfs_sig_set[i]))
  742                         SIGDELSET(newset, nfs_sig_set[i]);
  743         }
  744         mtx_unlock(&p->p_sigacts->ps_mtx);
  745         PROC_UNLOCK(p);
  746         kern_sigprocmask(td, SIG_SETMASK, &newset, oldset, 0);
  747 }
  748 
  749 void
  750 nfs_restore_sigmask(struct thread *td, sigset_t *set)
  751 {
  752         if (td == NULL)
  753                 td = curthread; /* XXX */
  754         kern_sigprocmask(td, SIG_SETMASK, set, NULL, 0);
  755 }
  756 
  757 /*
  758  * NFS wrapper to msleep(), that shoves a new p_sigmask and restores the
  759  * old one after msleep() returns.
  760  */
  761 int
  762 nfs_msleep(struct thread *td, void *ident, struct mtx *mtx, int priority,
  763     char *wmesg, int timo)
  764 {
  765         sigset_t oldset;
  766         int error;
  767         struct proc *p;
  768 
  769         if ((priority & PCATCH) == 0)
  770                 return msleep(ident, mtx, priority, wmesg, timo);
  771         if (td == NULL)
  772                 td = curthread; /* XXX */
  773         nfs_set_sigmask(td, &oldset);
  774         error = msleep(ident, mtx, priority, wmesg, timo);
  775         nfs_restore_sigmask(td, &oldset);
  776         p = td->td_proc;
  777         return (error);
  778 }
  779 
  780 /*
  781  * Test for a termination condition pending on the process.
  782  * This is used for NFSMNT_INT mounts.
  783  */
  784 int
  785 nfs_sigintr(struct nfsmount *nmp, struct thread *td)
  786 {
  787         struct proc *p;
  788         sigset_t tmpset;
  789 
  790         /* Terminate all requests while attempting a forced unmount. */
  791         if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)
  792                 return (EIO);
  793         if (!(nmp->nm_flag & NFSMNT_INT))
  794                 return (0);
  795         if (td == NULL)
  796                 return (0);
  797         p = td->td_proc;
  798         PROC_LOCK(p);
  799         tmpset = p->p_siglist;
  800         SIGSETOR(tmpset, td->td_siglist);
  801         SIGSETNAND(tmpset, td->td_sigmask);
  802         mtx_lock(&p->p_sigacts->ps_mtx);
  803         SIGSETNAND(tmpset, p->p_sigacts->ps_sigignore);
  804         mtx_unlock(&p->p_sigacts->ps_mtx);
  805         if ((SIGNOTEMPTY(p->p_siglist) || SIGNOTEMPTY(td->td_siglist))
  806             && nfs_sig_pending(tmpset)) {
  807                 PROC_UNLOCK(p);
  808                 return (EINTR);
  809         }
  810         PROC_UNLOCK(p);
  811         return (0);
  812 }
  813 
  814 static int
  815 nfs_msg(struct thread *td, const char *server, const char *msg, int error)
  816 {
  817         struct proc *p;
  818 
  819         p = td ? td->td_proc : NULL;
  820         if (error)
  821                 tprintf(p, LOG_INFO, "nfs server %s: %s, error %d\n", server,
  822                     msg, error);
  823         else
  824                 tprintf(p, LOG_INFO, "nfs server %s: %s\n", server, msg);
  825         return (0);
  826 }
  827 
  828 static void
  829 nfs_down(struct nfsmount *nmp, struct thread *td, const char *msg,
  830     int error, int flags)
  831 {
  832         if (nmp == NULL)
  833                 return;
  834         mtx_lock(&nmp->nm_mtx);
  835         if ((flags & NFSSTA_TIMEO) && !(nmp->nm_state & NFSSTA_TIMEO)) {
  836                 nmp->nm_state |= NFSSTA_TIMEO;
  837                 mtx_unlock(&nmp->nm_mtx);
  838                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
  839                     VQ_NOTRESP, 0);
  840         } else
  841                 mtx_unlock(&nmp->nm_mtx);
  842         mtx_lock(&nmp->nm_mtx);
  843         if ((flags & NFSSTA_LOCKTIMEO) &&
  844             !(nmp->nm_state & NFSSTA_LOCKTIMEO)) {
  845                 nmp->nm_state |= NFSSTA_LOCKTIMEO;
  846                 mtx_unlock(&nmp->nm_mtx);
  847                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
  848                     VQ_NOTRESPLOCK, 0);
  849         } else
  850                 mtx_unlock(&nmp->nm_mtx);
  851         nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, error);
  852 }
  853 
  854 static void
  855 nfs_up(struct nfsmount *nmp, struct thread *td, const char *msg,
  856     int flags, int tprintfmsg)
  857 {
  858         if (nmp == NULL)
  859                 return;
  860         if (tprintfmsg)
  861                 nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, 0);
  862 
  863         mtx_lock(&nmp->nm_mtx);
  864         if ((flags & NFSSTA_TIMEO) && (nmp->nm_state & NFSSTA_TIMEO)) {
  865                 nmp->nm_state &= ~NFSSTA_TIMEO;
  866                 mtx_unlock(&nmp->nm_mtx);
  867                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
  868                     VQ_NOTRESP, 1);
  869         } else
  870                 mtx_unlock(&nmp->nm_mtx);
  871 
  872         mtx_lock(&nmp->nm_mtx);
  873         if ((flags & NFSSTA_LOCKTIMEO) &&
  874             (nmp->nm_state & NFSSTA_LOCKTIMEO)) {
  875                 nmp->nm_state &= ~NFSSTA_LOCKTIMEO;
  876                 mtx_unlock(&nmp->nm_mtx);
  877                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
  878                     VQ_NOTRESPLOCK, 1);
  879         } else
  880                 mtx_unlock(&nmp->nm_mtx);
  881 }

Cache object: c541636190767e45688e84b7701ef8ff


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