The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/nfsclient/nfs_vfsops.c

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    1 /*-
    2  * Copyright (c) 1989, 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_vfsops.c        8.12 (Berkeley) 5/20/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 
   39 #include "opt_bootp.h"
   40 #include "opt_nfsroot.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/kernel.h>
   45 #include <sys/bio.h>
   46 #include <sys/buf.h>
   47 #include <sys/clock.h>
   48 #include <sys/lock.h>
   49 #include <sys/malloc.h>
   50 #include <sys/mbuf.h>
   51 #include <sys/module.h>
   52 #include <sys/mount.h>
   53 #include <sys/proc.h>
   54 #include <sys/socket.h>
   55 #include <sys/socketvar.h>
   56 #include <sys/sockio.h>
   57 #include <sys/sysctl.h>
   58 #include <sys/vnode.h>
   59 #include <sys/signalvar.h>
   60 
   61 #include <vm/vm.h>
   62 #include <vm/vm_extern.h>
   63 #include <vm/uma.h>
   64 
   65 #include <net/if.h>
   66 #include <net/route.h>
   67 #include <netinet/in.h>
   68 
   69 #include <rpc/rpcclnt.h>
   70 
   71 #include <nfs/rpcv2.h>
   72 #include <nfs/nfsproto.h>
   73 #include <nfsclient/nfs.h>
   74 #include <nfsclient/nfsnode.h>
   75 #include <nfsclient/nfsmount.h>
   76 #include <nfs/xdr_subs.h>
   77 #include <nfsclient/nfsm_subs.h>
   78 #include <nfsclient/nfsdiskless.h>
   79 
   80 MALLOC_DEFINE(M_NFSREQ, "nfsclient_req", "NFS request header");
   81 MALLOC_DEFINE(M_NFSBIGFH, "nfsclient_bigfh", "NFS version 3 file handle");
   82 MALLOC_DEFINE(M_NFSDIROFF, "nfsclient_diroff", "NFS directory offset data");
   83 MALLOC_DEFINE(M_NFSHASH, "nfsclient_hash", "NFS hash tables");
   84 MALLOC_DEFINE(M_NFSDIRECTIO, "nfsclient_directio", "NFS Direct IO async write state");
   85 
   86 uma_zone_t nfsmount_zone;
   87 
   88 struct nfsstats nfsstats;
   89 
   90 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem");
   91 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RW,
   92         &nfsstats, nfsstats, "S,nfsstats");
   93 static int nfs_ip_paranoia = 1;
   94 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW,
   95     &nfs_ip_paranoia, 0, "");
   96 #ifdef NFS_DEBUG
   97 int nfs_debug;
   98 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, "");
   99 #endif
  100 static int nfs_tprintf_initial_delay = NFS_TPRINTF_INITIAL_DELAY;
  101 SYSCTL_INT(_vfs_nfs, NFS_TPRINTF_INITIAL_DELAY,
  102         downdelayinitial, CTLFLAG_RW, &nfs_tprintf_initial_delay, 0, "");
  103 /* how long between console messages "nfs server foo not responding" */
  104 static int nfs_tprintf_delay = NFS_TPRINTF_DELAY;
  105 SYSCTL_INT(_vfs_nfs, NFS_TPRINTF_DELAY,
  106         downdelayinterval, CTLFLAG_RW, &nfs_tprintf_delay, 0, "");
  107 
  108 static void     nfs_decode_args(struct mount *mp, struct nfsmount *nmp,
  109                     struct nfs_args *argp);
  110 static int      mountnfs(struct nfs_args *, struct mount *,
  111                     struct sockaddr *, char *, struct vnode **,
  112                     struct ucred *cred);
  113 static vfs_mount_t nfs_mount;
  114 static vfs_cmount_t nfs_cmount;
  115 static vfs_unmount_t nfs_unmount;
  116 static vfs_root_t nfs_root;
  117 static vfs_statfs_t nfs_statfs;
  118 static vfs_sync_t nfs_sync;
  119 static vfs_sysctl_t nfs_sysctl;
  120 
  121 /*
  122  * nfs vfs operations.
  123  */
  124 static struct vfsops nfs_vfsops = {
  125         .vfs_init =             nfs_init,
  126         .vfs_mount =            nfs_mount,
  127         .vfs_cmount =           nfs_cmount,
  128         .vfs_root =             nfs_root,
  129         .vfs_statfs =           nfs_statfs,
  130         .vfs_sync =             nfs_sync,
  131         .vfs_uninit =           nfs_uninit,
  132         .vfs_unmount =          nfs_unmount,
  133         .vfs_sysctl =           nfs_sysctl,
  134 };
  135 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK);
  136 
  137 /* So that loader and kldload(2) can find us, wherever we are.. */
  138 MODULE_VERSION(nfs, 1);
  139 
  140 static struct nfs_rpcops nfs_rpcops = {
  141         nfs_readrpc,
  142         nfs_writerpc,
  143         nfs_writebp,
  144         nfs_readlinkrpc,
  145         nfs_invaldir,
  146         nfs_commit,
  147 };
  148 
  149 /*
  150  * This structure must be filled in by a primary bootstrap or bootstrap
  151  * server for a diskless/dataless machine. It is initialized below just
  152  * to ensure that it is allocated to initialized data (.data not .bss).
  153  */
  154 struct nfs_diskless nfs_diskless = { { { 0 } } };
  155 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } };
  156 int nfs_diskless_valid = 0;
  157 
  158 SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD,
  159         &nfs_diskless_valid, 0, "");
  160 
  161 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD,
  162         nfsv3_diskless.root_hostnam, 0, "");
  163 
  164 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD,
  165         &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr,
  166         "%Ssockaddr_in", "");
  167 
  168 
  169 void            nfsargs_ntoh(struct nfs_args *);
  170 static int      nfs_mountdiskless(char *, int,
  171                     struct sockaddr_in *, struct nfs_args *,
  172                     struct thread *, struct vnode **, struct mount *);
  173 static void     nfs_convert_diskless(void);
  174 static void     nfs_convert_oargs(struct nfs_args *args,
  175                     struct onfs_args *oargs);
  176 
  177 int
  178 nfs_iosize(struct nfsmount *nmp)
  179 {
  180         int iosize;
  181 
  182         /*
  183          * Calculate the size used for io buffers.  Use the larger
  184          * of the two sizes to minimise nfs requests but make sure
  185          * that it is at least one VM page to avoid wasting buffer
  186          * space.
  187          */
  188         iosize = imax(nmp->nm_rsize, nmp->nm_wsize);
  189         iosize = imax(iosize, PAGE_SIZE);
  190         return (iosize);
  191 }
  192 
  193 static void
  194 nfs_convert_oargs(struct nfs_args *args, struct onfs_args *oargs)
  195 {
  196 
  197         args->version = NFS_ARGSVERSION;
  198         args->addr = oargs->addr;
  199         args->addrlen = oargs->addrlen;
  200         args->sotype = oargs->sotype;
  201         args->proto = oargs->proto;
  202         args->fh = oargs->fh;
  203         args->fhsize = oargs->fhsize;
  204         args->flags = oargs->flags;
  205         args->wsize = oargs->wsize;
  206         args->rsize = oargs->rsize;
  207         args->readdirsize = oargs->readdirsize;
  208         args->timeo = oargs->timeo;
  209         args->retrans = oargs->retrans;
  210         args->maxgrouplist = oargs->maxgrouplist;
  211         args->readahead = oargs->readahead;
  212         args->deadthresh = oargs->deadthresh;
  213         args->hostname = oargs->hostname;
  214 }
  215 
  216 static void
  217 nfs_convert_diskless(void)
  218 {
  219 
  220         bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif,
  221                 sizeof(struct ifaliasreq));
  222         bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway,
  223                 sizeof(struct sockaddr_in));
  224         nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args);
  225         if (nfsv3_diskless.root_args.flags & NFSMNT_NFSV3) {
  226                 nfsv3_diskless.root_fhsize = NFSX_V3FH;
  227                 bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V3FH);
  228         } else {
  229                 nfsv3_diskless.root_fhsize = NFSX_V2FH;
  230                 bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V2FH);
  231         }
  232         bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr,
  233                 sizeof(struct sockaddr_in));
  234         bcopy(nfs_diskless.root_hostnam, nfsv3_diskless.root_hostnam, MNAMELEN);
  235         nfsv3_diskless.root_time = nfs_diskless.root_time;
  236         bcopy(nfs_diskless.my_hostnam, nfsv3_diskless.my_hostnam,
  237                 MAXHOSTNAMELEN);
  238         nfs_diskless_valid = 3;
  239 }
  240 
  241 /*
  242  * nfs statfs call
  243  */
  244 static int
  245 nfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
  246 {
  247         struct vnode *vp;
  248         struct nfs_statfs *sfp;
  249         caddr_t bpos, dpos;
  250         struct nfsmount *nmp = VFSTONFS(mp);
  251         int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr;
  252         struct mbuf *mreq, *mrep, *md, *mb;
  253         struct nfsnode *np;
  254         u_quad_t tquad;
  255 
  256 #ifndef nolint
  257         sfp = NULL;
  258 #endif
  259         error = vfs_busy(mp, LK_NOWAIT, NULL, td);
  260         if (error)
  261                 return (error);
  262         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, LK_EXCLUSIVE);
  263         if (error) {
  264                 vfs_unbusy(mp, td);
  265                 return (error);
  266         }
  267         vp = NFSTOV(np);
  268         mtx_lock(&nmp->nm_mtx);
  269         if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
  270                 mtx_unlock(&nmp->nm_mtx);               
  271                 (void)nfs_fsinfo(nmp, vp, td->td_ucred, td);
  272         } else
  273                 mtx_unlock(&nmp->nm_mtx);
  274         nfsstats.rpccnt[NFSPROC_FSSTAT]++;
  275         mreq = nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3));
  276         mb = mreq;
  277         bpos = mtod(mb, caddr_t);
  278         nfsm_fhtom(vp, v3);
  279         nfsm_request(vp, NFSPROC_FSSTAT, td, td->td_ucred);
  280         if (v3)
  281                 nfsm_postop_attr(vp, retattr);
  282         if (error) {
  283                 if (mrep != NULL)
  284                         m_freem(mrep);
  285                 goto nfsmout;
  286         }
  287         sfp = nfsm_dissect(struct nfs_statfs *, NFSX_STATFS(v3));
  288         mtx_lock(&nmp->nm_mtx);
  289         sbp->f_iosize = nfs_iosize(nmp);
  290         mtx_unlock(&nmp->nm_mtx);
  291         if (v3) {
  292                 sbp->f_bsize = NFS_FABLKSIZE;
  293                 tquad = fxdr_hyper(&sfp->sf_tbytes);
  294                 sbp->f_blocks = tquad / NFS_FABLKSIZE;
  295                 tquad = fxdr_hyper(&sfp->sf_fbytes);
  296                 sbp->f_bfree = tquad / NFS_FABLKSIZE;
  297                 tquad = fxdr_hyper(&sfp->sf_abytes);
  298                 sbp->f_bavail = tquad / NFS_FABLKSIZE;
  299                 sbp->f_files = (fxdr_unsigned(int32_t,
  300                     sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff);
  301                 sbp->f_ffree = (fxdr_unsigned(int32_t,
  302                     sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff);
  303         } else {
  304                 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
  305                 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
  306                 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
  307                 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
  308                 sbp->f_files = 0;
  309                 sbp->f_ffree = 0;
  310         }
  311         m_freem(mrep);
  312 nfsmout:
  313         vput(vp);
  314         vfs_unbusy(mp, td);
  315         return (error);
  316 }
  317 
  318 /*
  319  * nfs version 3 fsinfo rpc call
  320  */
  321 int
  322 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct ucred *cred,
  323     struct thread *td)
  324 {
  325         struct nfsv3_fsinfo *fsp;
  326         u_int32_t pref, max;
  327         caddr_t bpos, dpos;
  328         int error = 0, retattr;
  329         struct mbuf *mreq, *mrep, *md, *mb;
  330         u_int64_t maxfsize;
  331         
  332         nfsstats.rpccnt[NFSPROC_FSINFO]++;
  333         mreq = nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1));
  334         mb = mreq;
  335         bpos = mtod(mb, caddr_t);
  336         nfsm_fhtom(vp, 1);
  337         nfsm_request(vp, NFSPROC_FSINFO, td, cred);
  338         nfsm_postop_attr(vp, retattr);
  339         if (!error) {
  340                 fsp = nfsm_dissect(struct nfsv3_fsinfo *, NFSX_V3FSINFO);
  341                 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
  342                 mtx_lock(&nmp->nm_mtx);
  343                 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
  344                         nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
  345                                 ~(NFS_FABLKSIZE - 1);
  346                 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
  347                 if (max < nmp->nm_wsize && max > 0) {
  348                         nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
  349                         if (nmp->nm_wsize == 0)
  350                                 nmp->nm_wsize = max;
  351                 }
  352                 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
  353                 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
  354                         nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
  355                                 ~(NFS_FABLKSIZE - 1);
  356                 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
  357                 if (max < nmp->nm_rsize && max > 0) {
  358                         nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
  359                         if (nmp->nm_rsize == 0)
  360                                 nmp->nm_rsize = max;
  361                 }
  362                 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
  363                 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ)
  364                         nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) &
  365                                 ~(NFS_DIRBLKSIZ - 1);
  366                 if (max < nmp->nm_readdirsize && max > 0) {
  367                         nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1);
  368                         if (nmp->nm_readdirsize == 0)
  369                                 nmp->nm_readdirsize = max;
  370                 }
  371                 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
  372                 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
  373                         nmp->nm_maxfilesize = maxfsize;
  374                 nmp->nm_mountp->mnt_stat.f_iosize = nfs_iosize(nmp);
  375                 nmp->nm_state |= NFSSTA_GOTFSINFO;
  376                 mtx_unlock(&nmp->nm_mtx);
  377         }
  378         m_freem(mrep);
  379 nfsmout:
  380         return (error);
  381 }
  382 
  383 /*
  384  * Mount a remote root fs via. nfs. This depends on the info in the
  385  * nfs_diskless structure that has been filled in properly by some primary
  386  * bootstrap.
  387  * It goes something like this:
  388  * - do enough of "ifconfig" by calling ifioctl() so that the system
  389  *   can talk to the server
  390  * - If nfs_diskless.mygateway is filled in, use that address as
  391  *   a default gateway.
  392  * - build the rootfs mount point and call mountnfs() to do the rest.
  393  *
  394  * It is assumed to be safe to read, modify, and write the nfsv3_diskless
  395  * structure, as well as other global NFS client variables here, as
  396  * nfs_mountroot() will be called once in the boot before any other NFS
  397  * client activity occurs.
  398  */
  399 int
  400 nfs_mountroot(struct mount *mp, struct thread *td)
  401 {
  402         struct nfsv3_diskless *nd = &nfsv3_diskless;
  403         struct socket *so;
  404         struct vnode *vp;
  405         struct ifreq ir;
  406         int error, i;
  407         u_long l;
  408         char buf[128];
  409         char *cp;
  410 
  411 #if defined(BOOTP_NFSROOT) && defined(BOOTP)
  412         bootpc_init();          /* use bootp to get nfs_diskless filled in */
  413 #elif defined(NFS_ROOT)
  414         nfs_setup_diskless();
  415 #endif
  416 
  417         if (nfs_diskless_valid == 0)
  418                 return (-1);
  419         if (nfs_diskless_valid == 1)
  420                 nfs_convert_diskless();
  421 
  422         /*
  423          * XXX splnet, so networks will receive...
  424          */
  425         splnet();
  426 
  427         /*
  428          * Do enough of ifconfig(8) so that the critical net interface can
  429          * talk to the server.
  430          */
  431         error = socreate(nd->myif.ifra_addr.sa_family, &so, nd->root_args.sotype, 0,
  432             td->td_ucred, td);
  433         if (error)
  434                 panic("nfs_mountroot: socreate(%04x): %d",
  435                         nd->myif.ifra_addr.sa_family, error);
  436 
  437 #if 0 /* XXX Bad idea */
  438         /*
  439          * We might not have been told the right interface, so we pass
  440          * over the first ten interfaces of the same kind, until we get
  441          * one of them configured.
  442          */
  443 
  444         for (i = strlen(nd->myif.ifra_name) - 1;
  445                 nd->myif.ifra_name[i] >= '' &&
  446                 nd->myif.ifra_name[i] <= '9';
  447                 nd->myif.ifra_name[i] ++) {
  448                 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
  449                 if(!error)
  450                         break;
  451         }
  452 #endif
  453         error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
  454         if (error)
  455                 panic("nfs_mountroot: SIOCAIFADDR: %d", error);
  456         if ((cp = getenv("boot.netif.mtu")) != NULL) {
  457                 ir.ifr_mtu = strtol(cp, NULL, 10);
  458                 bcopy(nd->myif.ifra_name, ir.ifr_name, IFNAMSIZ);
  459                 freeenv(cp);
  460                 error = ifioctl(so, SIOCSIFMTU, (caddr_t)&ir, td);
  461                 if (error)
  462                         printf("nfs_mountroot: SIOCSIFMTU: %d", error);
  463         }
  464         soclose(so);
  465 
  466         /*
  467          * If the gateway field is filled in, set it as the default route.
  468          * Note that pxeboot will set a default route of 0 if the route
  469          * is not set by the DHCP server.  Check also for a value of 0
  470          * to avoid panicking inappropriately in that situation.
  471          */
  472         if (nd->mygateway.sin_len != 0 &&
  473             nd->mygateway.sin_addr.s_addr != 0) {
  474                 struct sockaddr_in mask, sin;
  475 
  476                 bzero((caddr_t)&mask, sizeof(mask));
  477                 sin = mask;
  478                 sin.sin_family = AF_INET;
  479                 sin.sin_len = sizeof(sin);
  480                 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin,
  481                     (struct sockaddr *)&nd->mygateway,
  482                     (struct sockaddr *)&mask,
  483                     RTF_UP | RTF_GATEWAY, NULL);
  484                 if (error)
  485                         panic("nfs_mountroot: RTM_ADD: %d", error);
  486         }
  487 
  488         /*
  489          * Create the rootfs mount point.
  490          */
  491         nd->root_args.fh = nd->root_fh;
  492         nd->root_args.fhsize = nd->root_fhsize;
  493         l = ntohl(nd->root_saddr.sin_addr.s_addr);
  494         snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s",
  495                 (l >> 24) & 0xff, (l >> 16) & 0xff,
  496                 (l >>  8) & 0xff, (l >>  0) & 0xff, nd->root_hostnam);
  497         printf("NFS ROOT: %s\n", buf);
  498         if ((error = nfs_mountdiskless(buf, MNT_RDONLY,
  499             &nd->root_saddr, &nd->root_args, td, &vp, mp)) != 0) {
  500                 return (error);
  501         }
  502 
  503         /*
  504          * This is not really an nfs issue, but it is much easier to
  505          * set hostname here and then let the "/etc/rc.xxx" files
  506          * mount the right /var based upon its preset value.
  507          */
  508         bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN);
  509         hostname[MAXHOSTNAMELEN - 1] = '\0';
  510         for (i = 0; i < MAXHOSTNAMELEN; i++)
  511                 if (hostname[i] == '\0')
  512                         break;
  513         inittodr(ntohl(nd->root_time));
  514         return (0);
  515 }
  516 
  517 /*
  518  * Internal version of mount system call for diskless setup.
  519  */
  520 static int
  521 nfs_mountdiskless(char *path, int mountflag,
  522     struct sockaddr_in *sin, struct nfs_args *args, struct thread *td,
  523     struct vnode **vpp, struct mount *mp)
  524 {
  525         struct sockaddr *nam;
  526         int error;
  527 
  528         MNT_ILOCK(mp);
  529         mp->mnt_kern_flag = 0;
  530         mp->mnt_flag = mountflag;
  531         MNT_IUNLOCK(mp);
  532         nam = sodupsockaddr((struct sockaddr *)sin, M_WAITOK);
  533         if ((error = mountnfs(args, mp, nam, path, vpp,
  534             td->td_ucred)) != 0) {
  535                 printf("nfs_mountroot: mount %s on /: %d\n", path, error);
  536                 return (error);
  537         }
  538         return (0);
  539 }
  540 
  541 static void
  542 nfs_decode_args(struct mount *mp, struct nfsmount *nmp, struct nfs_args *argp)
  543 {
  544         int s;
  545         int adjsock;
  546         int maxio;
  547 
  548         s = splnet();
  549 
  550         /*
  551          * Set read-only flag if requested; otherwise, clear it if this is
  552          * an update.  If this is not an update, then either the read-only
  553          * flag is already clear, or this is a root mount and it was set
  554          * intentionally at some previous point.
  555          */
  556         if (vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL) == 0) {
  557                 MNT_ILOCK(mp);
  558                 mp->mnt_flag |= MNT_RDONLY;
  559                 MNT_IUNLOCK(mp);
  560         } else if (mp->mnt_flag & MNT_UPDATE) {
  561                 MNT_ILOCK(mp);
  562                 mp->mnt_flag &= ~MNT_RDONLY;
  563                 MNT_IUNLOCK(mp);
  564         }
  565 
  566         /*
  567          * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
  568          * no sense in that context.  Also, set up appropriate retransmit
  569          * and soft timeout behavior.
  570          */
  571         if (argp->sotype == SOCK_STREAM) {
  572                 nmp->nm_flag &= ~NFSMNT_NOCONN;
  573                 nmp->nm_flag |= NFSMNT_DUMBTIMR;
  574                 nmp->nm_timeo = NFS_MAXTIMEO;
  575                 nmp->nm_retry = NFS_RETRANS_TCP;
  576         }
  577 
  578         /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */
  579         if ((argp->flags & NFSMNT_NFSV3) == 0)
  580                 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
  581 
  582         /* Re-bind if rsrvd port requested and wasn't on one */
  583         adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
  584                   && (argp->flags & NFSMNT_RESVPORT);
  585         /* Also re-bind if we're switching to/from a connected UDP socket */
  586         adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
  587                     (argp->flags & NFSMNT_NOCONN));
  588 
  589         /* Update flags atomically.  Don't change the lock bits. */
  590         nmp->nm_flag = argp->flags | nmp->nm_flag;
  591         splx(s);
  592 
  593         if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
  594                 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
  595                 if (nmp->nm_timeo < NFS_MINTIMEO)
  596                         nmp->nm_timeo = NFS_MINTIMEO;
  597                 else if (nmp->nm_timeo > NFS_MAXTIMEO)
  598                         nmp->nm_timeo = NFS_MAXTIMEO;
  599         }
  600 
  601         if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
  602                 nmp->nm_retry = argp->retrans;
  603                 if (nmp->nm_retry > NFS_MAXREXMIT)
  604                         nmp->nm_retry = NFS_MAXREXMIT;
  605         }
  606 
  607         if (argp->flags & NFSMNT_NFSV3) {
  608                 if (argp->sotype == SOCK_DGRAM)
  609                         maxio = NFS_MAXDGRAMDATA;
  610                 else
  611                         maxio = NFS_MAXDATA;
  612         } else
  613                 maxio = NFS_V2MAXDATA;
  614 
  615         if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
  616                 nmp->nm_wsize = argp->wsize;
  617                 /* Round down to multiple of blocksize */
  618                 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
  619                 if (nmp->nm_wsize <= 0)
  620                         nmp->nm_wsize = NFS_FABLKSIZE;
  621         }
  622         if (nmp->nm_wsize > maxio)
  623                 nmp->nm_wsize = maxio;
  624         if (nmp->nm_wsize > MAXBSIZE)
  625                 nmp->nm_wsize = MAXBSIZE;
  626 
  627         if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
  628                 nmp->nm_rsize = argp->rsize;
  629                 /* Round down to multiple of blocksize */
  630                 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
  631                 if (nmp->nm_rsize <= 0)
  632                         nmp->nm_rsize = NFS_FABLKSIZE;
  633         }
  634         if (nmp->nm_rsize > maxio)
  635                 nmp->nm_rsize = maxio;
  636         if (nmp->nm_rsize > MAXBSIZE)
  637                 nmp->nm_rsize = MAXBSIZE;
  638 
  639         if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
  640                 nmp->nm_readdirsize = argp->readdirsize;
  641         }
  642         if (nmp->nm_readdirsize > maxio)
  643                 nmp->nm_readdirsize = maxio;
  644         if (nmp->nm_readdirsize > nmp->nm_rsize)
  645                 nmp->nm_readdirsize = nmp->nm_rsize;
  646 
  647         if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0)
  648                 nmp->nm_acregmin = argp->acregmin;
  649         else
  650                 nmp->nm_acregmin = NFS_MINATTRTIMO;
  651         if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0)
  652                 nmp->nm_acregmax = argp->acregmax;
  653         else
  654                 nmp->nm_acregmax = NFS_MAXATTRTIMO;
  655         if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0)
  656                 nmp->nm_acdirmin = argp->acdirmin;
  657         else
  658                 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO;
  659         if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0)
  660                 nmp->nm_acdirmax = argp->acdirmax;
  661         else
  662                 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO;
  663         if (nmp->nm_acdirmin > nmp->nm_acdirmax)
  664                 nmp->nm_acdirmin = nmp->nm_acdirmax;
  665         if (nmp->nm_acregmin > nmp->nm_acregmax)
  666                 nmp->nm_acregmin = nmp->nm_acregmax;
  667 
  668         if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) {
  669                 if (argp->maxgrouplist <= NFS_MAXGRPS)
  670                         nmp->nm_numgrps = argp->maxgrouplist;
  671                 else
  672                         nmp->nm_numgrps = NFS_MAXGRPS;
  673         }
  674         if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) {
  675                 if (argp->readahead <= NFS_MAXRAHEAD)
  676                         nmp->nm_readahead = argp->readahead;
  677                 else
  678                         nmp->nm_readahead = NFS_MAXRAHEAD;
  679         }
  680         if ((argp->flags & NFSMNT_WCOMMITSIZE) && argp->wcommitsize >= 0) {
  681                 if (argp->wcommitsize < nmp->nm_wsize)
  682                         nmp->nm_wcommitsize = nmp->nm_wsize;
  683                 else
  684                         nmp->nm_wcommitsize = argp->wcommitsize;
  685         }
  686         if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 0) {
  687                 if (argp->deadthresh <= NFS_MAXDEADTHRESH)
  688                         nmp->nm_deadthresh = argp->deadthresh;
  689                 else
  690                         nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
  691         }
  692 
  693         adjsock |= ((nmp->nm_sotype != argp->sotype) ||
  694                     (nmp->nm_soproto != argp->proto));
  695         nmp->nm_sotype = argp->sotype;
  696         nmp->nm_soproto = argp->proto;
  697 
  698         if (nmp->nm_so && adjsock) {
  699                 nfs_safedisconnect(nmp);
  700                 if (nmp->nm_sotype == SOCK_DGRAM)
  701                         while (nfs_connect(nmp, NULL)) {
  702                                 printf("nfs_args: retrying connect\n");
  703                                 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0);
  704                         }
  705         }
  706 }
  707 
  708 static const char *nfs_opts[] = { "from", "nfs_args", NULL };
  709 
  710 /*
  711  * VFS Operations.
  712  *
  713  * mount system call
  714  * It seems a bit dumb to copyinstr() the host and path here and then
  715  * bcopy() them in mountnfs(), but I wanted to detect errors before
  716  * doing the sockargs() call because sockargs() allocates an mbuf and
  717  * an error after that means that I have to release the mbuf.
  718  */
  719 /* ARGSUSED */
  720 static int
  721 nfs_mount(struct mount *mp, struct thread *td)
  722 {
  723         int error;
  724         struct nfs_args args;
  725         struct sockaddr *nam;
  726         struct vnode *vp;
  727         char hst[MNAMELEN];
  728         size_t len;
  729         u_char nfh[NFSX_V3FHMAX];
  730 
  731         if (vfs_filteropt(mp->mnt_optnew, nfs_opts)) {
  732                 error = EINVAL;
  733                 goto out;
  734         }
  735 
  736         if (mp->mnt_flag & MNT_ROOTFS) {
  737                 error = nfs_mountroot(mp, td);
  738                 goto out;
  739         }
  740 
  741         error = vfs_copyopt(mp->mnt_optnew, "nfs_args", &args, sizeof args);
  742         if (error)
  743                 goto out;
  744 
  745         if (args.version != NFS_ARGSVERSION) {
  746                 error = EPROGMISMATCH;
  747                 goto out;
  748         }
  749         if (mp->mnt_flag & MNT_UPDATE) {
  750                 struct nfsmount *nmp = VFSTONFS(mp);
  751 
  752                 if (nmp == NULL) {
  753                         error = EIO;
  754                         goto out;
  755                 }
  756                 /*
  757                  * When doing an update, we can't change from or to
  758                  * v3, switch lockd strategies or change cookie translation
  759                  */
  760                 args.flags = (args.flags &
  761                     ~(NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/)) |
  762                     (nmp->nm_flag &
  763                         (NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/));
  764                 nfs_decode_args(mp, nmp, &args);
  765                 goto out;
  766         }
  767 
  768         /*
  769          * Make the nfs_ip_paranoia sysctl serve as the default connection
  770          * or no-connection mode for those protocols that support 
  771          * no-connection mode (the flag will be cleared later for protocols
  772          * that do not support no-connection mode).  This will allow a client
  773          * to receive replies from a different IP then the request was
  774          * sent to.  Note: default value for nfs_ip_paranoia is 1 (paranoid),
  775          * not 0.
  776          */
  777         if (nfs_ip_paranoia == 0)
  778                 args.flags |= NFSMNT_NOCONN;
  779         if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) {
  780                 error = EINVAL;
  781                 goto out;
  782         }
  783         error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
  784         if (error)
  785                 goto out;
  786         error = copyinstr(args.hostname, hst, MNAMELEN-1, &len);
  787         if (error)
  788                 goto out;
  789         bzero(&hst[len], MNAMELEN - len);
  790         /* sockargs() call must be after above copyin() calls */
  791         error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen);
  792         if (error)
  793                 goto out;
  794         args.fh = nfh;
  795         error = mountnfs(&args, mp, nam, hst, &vp, td->td_ucred);
  796 out:
  797         if (!error) {
  798                 MNT_ILOCK(mp);
  799                 mp->mnt_kern_flag |= (MNTK_MPSAFE|MNTK_LOOKUP_SHARED);
  800                 MNT_IUNLOCK(mp);
  801         }
  802         return (error);
  803 }
  804 
  805 
  806 /*
  807  * VFS Operations.
  808  *
  809  * mount system call
  810  * It seems a bit dumb to copyinstr() the host and path here and then
  811  * bcopy() them in mountnfs(), but I wanted to detect errors before
  812  * doing the sockargs() call because sockargs() allocates an mbuf and
  813  * an error after that means that I have to release the mbuf.
  814  */
  815 /* ARGSUSED */
  816 static int
  817 nfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td)
  818 {
  819         int error;
  820         struct nfs_args args;
  821 
  822         error = copyin(data, &args, sizeof (struct nfs_args));
  823         if (error)
  824                 return error;
  825 
  826         ma = mount_arg(ma, "nfs_args", &args, sizeof args);
  827 
  828         error = kernel_mount(ma, flags);
  829         return (error);
  830 }
  831 
  832 /*
  833  * Common code for mount and mountroot
  834  */
  835 static int
  836 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam,
  837     char *hst, struct vnode **vpp, struct ucred *cred)
  838 {
  839         struct nfsmount *nmp;
  840         struct nfsnode *np;
  841         int error;
  842         struct vattr attrs;
  843 
  844         if (mp->mnt_flag & MNT_UPDATE) {
  845                 nmp = VFSTONFS(mp);
  846                 /* update paths, file handles, etc, here        XXX */
  847                 FREE(nam, M_SONAME);
  848                 return (0);
  849         } else {
  850                 nmp = uma_zalloc(nfsmount_zone, M_WAITOK);
  851                 bzero((caddr_t)nmp, sizeof (struct nfsmount));
  852                 TAILQ_INIT(&nmp->nm_bufq);
  853                 mp->mnt_data = (qaddr_t)nmp;
  854         }
  855         vfs_getnewfsid(mp);
  856         nmp->nm_mountp = mp;
  857         mtx_init(&nmp->nm_mtx, "NFSmount lock", NULL, MTX_DEF);                 
  858 
  859         /*
  860          * V2 can only handle 32 bit filesizes.  A 4GB-1 limit may be too
  861          * high, depending on whether we end up with negative offsets in
  862          * the client or server somewhere.  2GB-1 may be safer.
  863          *
  864          * For V3, nfs_fsinfo will adjust this as necessary.  Assume maximum
  865          * that we can handle until we find out otherwise.
  866          * XXX Our "safe" limit on the client is what we can store in our
  867          * buffer cache using signed(!) block numbers.
  868          */
  869         if ((argp->flags & NFSMNT_NFSV3) == 0)
  870                 nmp->nm_maxfilesize = 0xffffffffLL;
  871         else
  872                 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
  873 
  874         nmp->nm_timeo = NFS_TIMEO;
  875         nmp->nm_retry = NFS_RETRANS;
  876         if ((argp->flags & NFSMNT_NFSV3) && argp->sotype == SOCK_STREAM) {
  877                 nmp->nm_wsize = nmp->nm_rsize = NFS_MAXDATA;
  878         } else {
  879                 nmp->nm_wsize = NFS_WSIZE;
  880                 nmp->nm_rsize = NFS_RSIZE;
  881         }
  882         nmp->nm_wcommitsize = hibufspace / (desiredvnodes / 1000);
  883         nmp->nm_readdirsize = NFS_READDIRSIZE;
  884         nmp->nm_numgrps = NFS_MAXGRPS;
  885         nmp->nm_readahead = NFS_DEFRAHEAD;
  886         nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
  887         nmp->nm_tprintf_delay = nfs_tprintf_delay;
  888         if (nmp->nm_tprintf_delay < 0)
  889                 nmp->nm_tprintf_delay = 0;
  890         nmp->nm_tprintf_initial_delay = nfs_tprintf_initial_delay;
  891         if (nmp->nm_tprintf_initial_delay < 0)
  892                 nmp->nm_tprintf_initial_delay = 0;
  893         nmp->nm_fhsize = argp->fhsize;
  894         bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize);
  895         bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
  896         nmp->nm_nam = nam;
  897         /* Set up the sockets and per-host congestion */
  898         nmp->nm_sotype = argp->sotype;
  899         nmp->nm_soproto = argp->proto;
  900         nmp->nm_rpcops = &nfs_rpcops;
  901 
  902         nfs_decode_args(mp, nmp, argp);
  903 
  904         /*
  905          * For Connection based sockets (TCP,...) defer the connect until
  906          * the first request, in case the server is not responding.
  907          */
  908         if (nmp->nm_sotype == SOCK_DGRAM &&
  909                 (error = nfs_connect(nmp, NULL)))
  910                 goto bad;
  911 
  912         /*
  913          * This is silly, but it has to be set so that vinifod() works.
  914          * We do not want to do an nfs_statfs() here since we can get
  915          * stuck on a dead server and we are holding a lock on the mount
  916          * point.
  917          */
  918         mtx_lock(&nmp->nm_mtx);
  919         mp->mnt_stat.f_iosize = nfs_iosize(nmp);
  920         mtx_unlock(&nmp->nm_mtx);
  921         /*
  922          * A reference count is needed on the nfsnode representing the
  923          * remote root.  If this object is not persistent, then backward
  924          * traversals of the mount point (i.e. "..") will not work if
  925          * the nfsnode gets flushed out of the cache. Ufs does not have
  926          * this problem, because one can identify root inodes by their
  927          * number == ROOTINO (2).
  928          */
  929         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, LK_EXCLUSIVE);
  930         if (error)
  931                 goto bad;
  932         *vpp = NFSTOV(np);
  933 
  934         /*
  935          * Get file attributes and transfer parameters for the
  936          * mountpoint.  This has the side effect of filling in
  937          * (*vpp)->v_type with the correct value.
  938          */
  939         if (argp->flags & NFSMNT_NFSV3)
  940                 nfs_fsinfo(nmp, *vpp, curthread->td_ucred, curthread);
  941         else
  942                 VOP_GETATTR(*vpp, &attrs, curthread->td_ucred, curthread);
  943 
  944         /*
  945          * Lose the lock but keep the ref.
  946          */
  947         VOP_UNLOCK(*vpp, 0, curthread);
  948 
  949         return (0);
  950 bad:
  951         nfs_disconnect(nmp);
  952         mtx_destroy(&nmp->nm_mtx);
  953         uma_zfree(nfsmount_zone, nmp);
  954         FREE(nam, M_SONAME);
  955         return (error);
  956 }
  957 
  958 /*
  959  * unmount system call
  960  */
  961 static int
  962 nfs_unmount(struct mount *mp, int mntflags, struct thread *td)
  963 {
  964         struct nfsmount *nmp;
  965         int error, flags = 0;
  966 
  967         if (mntflags & MNT_FORCE)
  968                 flags |= FORCECLOSE;
  969         nmp = VFSTONFS(mp);
  970         /*
  971          * Goes something like this..
  972          * - Call vflush() to clear out vnodes for this filesystem
  973          * - Close the socket
  974          * - Free up the data structures
  975          */
  976         /* In the forced case, cancel any outstanding requests. */
  977         if (flags & FORCECLOSE) {
  978                 error = nfs_nmcancelreqs(nmp);
  979                 if (error)
  980                         goto out;
  981         }
  982         /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */
  983         error = vflush(mp, 1, flags, td);
  984         if (error)
  985                 goto out;
  986 
  987         /*
  988          * We are now committed to the unmount.
  989          */
  990         nfs_disconnect(nmp);
  991         FREE(nmp->nm_nam, M_SONAME);
  992 
  993         mtx_destroy(&nmp->nm_mtx);
  994         uma_zfree(nfsmount_zone, nmp);
  995 out:
  996         return (error);
  997 }
  998 
  999 /*
 1000  * Return root of a filesystem
 1001  */
 1002 static int
 1003 nfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td)
 1004 {
 1005         struct vnode *vp;
 1006         struct nfsmount *nmp;
 1007         struct nfsnode *np;
 1008         int error;
 1009 
 1010         nmp = VFSTONFS(mp);
 1011         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, flags);
 1012         if (error)
 1013                 return error;
 1014         vp = NFSTOV(np);
 1015         /*
 1016          * Get transfer parameters and attributes for root vnode once.
 1017          */
 1018         mtx_lock(&nmp->nm_mtx);
 1019         if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0 &&
 1020             (nmp->nm_flag & NFSMNT_NFSV3)) {
 1021                 mtx_unlock(&nmp->nm_mtx);
 1022                 nfs_fsinfo(nmp, vp, curthread->td_ucred, curthread);
 1023         } else 
 1024                 mtx_unlock(&nmp->nm_mtx);
 1025         if (vp->v_type == VNON)
 1026             vp->v_type = VDIR;
 1027         vp->v_vflag |= VV_ROOT;
 1028         *vpp = vp;
 1029         return (0);
 1030 }
 1031 
 1032 /*
 1033  * Flush out the buffer cache
 1034  */
 1035 /* ARGSUSED */
 1036 static int
 1037 nfs_sync(struct mount *mp, int waitfor, struct thread *td)
 1038 {
 1039         struct vnode *vp, *mvp;
 1040         int error, allerror = 0;
 1041 
 1042         /*
 1043          * Force stale buffer cache information to be flushed.
 1044          */
 1045         MNT_ILOCK(mp);
 1046 loop:
 1047         MNT_VNODE_FOREACH(vp, mp, mvp) {
 1048                 VI_LOCK(vp);
 1049                 MNT_IUNLOCK(mp);
 1050                 if (VOP_ISLOCKED(vp, NULL) ||
 1051                     vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
 1052                     waitfor == MNT_LAZY) {
 1053                         VI_UNLOCK(vp);
 1054                         MNT_ILOCK(mp);
 1055                         continue;
 1056                 }
 1057                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
 1058                         MNT_ILOCK(mp);
 1059                         MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp);
 1060                         goto loop;
 1061                 }
 1062                 error = VOP_FSYNC(vp, waitfor, td);
 1063                 if (error)
 1064                         allerror = error;
 1065                 VOP_UNLOCK(vp, 0, td);
 1066                 vrele(vp);
 1067 
 1068                 MNT_ILOCK(mp);
 1069         }
 1070         MNT_IUNLOCK(mp);
 1071         return (allerror);
 1072 }
 1073 
 1074 static int
 1075 nfs_sysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
 1076 {
 1077         struct nfsmount *nmp = VFSTONFS(mp);
 1078         struct vfsquery vq;
 1079         int error;
 1080 
 1081         bzero(&vq, sizeof(vq));
 1082         switch (op) {
 1083 #if 0
 1084         case VFS_CTL_NOLOCKS:
 1085                 val = (nmp->nm_flag & NFSMNT_NOLOCKS) ? 1 : 0;
 1086                 if (req->oldptr != NULL) {
 1087                         error = SYSCTL_OUT(req, &val, sizeof(val));
 1088                         if (error)
 1089                                 return (error);
 1090                 }
 1091                 if (req->newptr != NULL) {
 1092                         error = SYSCTL_IN(req, &val, sizeof(val));
 1093                         if (error)
 1094                                 return (error);
 1095                         if (val)
 1096                                 nmp->nm_flag |= NFSMNT_NOLOCKS;
 1097                         else
 1098                                 nmp->nm_flag &= ~NFSMNT_NOLOCKS;
 1099                 }
 1100                 break;
 1101 #endif
 1102         case VFS_CTL_QUERY:
 1103                 mtx_lock(&nmp->nm_mtx);
 1104                 if (nmp->nm_state & NFSSTA_TIMEO)
 1105                         vq.vq_flags |= VQ_NOTRESP;
 1106                 mtx_unlock(&nmp->nm_mtx);
 1107 #if 0
 1108                 if (!(nmp->nm_flag & NFSMNT_NOLOCKS) &&
 1109                     (nmp->nm_state & NFSSTA_LOCKTIMEO))
 1110                         vq.vq_flags |= VQ_NOTRESPLOCK;
 1111 #endif
 1112                 error = SYSCTL_OUT(req, &vq, sizeof(vq));
 1113                 break;
 1114         case VFS_CTL_TIMEO:
 1115                 if (req->oldptr != NULL) {
 1116                         error = SYSCTL_OUT(req, &nmp->nm_tprintf_initial_delay,
 1117                             sizeof(nmp->nm_tprintf_initial_delay));
 1118                         if (error)
 1119                                 return (error);
 1120                 }
 1121                 if (req->newptr != NULL) {
 1122                         error = vfs_suser(mp, req->td);
 1123                         if (error)
 1124                                 return (error);
 1125                         error = SYSCTL_IN(req, &nmp->nm_tprintf_initial_delay,
 1126                             sizeof(nmp->nm_tprintf_initial_delay));
 1127                         if (error)
 1128                                 return (error);
 1129                         if (nmp->nm_tprintf_initial_delay < 0)
 1130                                 nmp->nm_tprintf_initial_delay = 0;
 1131                 }
 1132                 break;
 1133         default:
 1134                 return (ENOTSUP);
 1135         }
 1136         return (0);
 1137 }

Cache object: 678004d4d775324600e03afb54663ef4


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