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_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: releng/6.3/sys/nfsclient/nfs_vfsops.c 173165 2007-10-30 00:49:41Z sam $");
   37 
   38 #include "opt_bootp.h"
   39 #include "opt_nfsroot.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/kernel.h>
   44 #include <sys/bio.h>
   45 #include <sys/buf.h>
   46 #include <sys/lock.h>
   47 #include <sys/malloc.h>
   48 #include <sys/mbuf.h>
   49 #include <sys/module.h>
   50 #include <sys/mount.h>
   51 #include <sys/proc.h>
   52 #include <sys/socket.h>
   53 #include <sys/socketvar.h>
   54 #include <sys/sockio.h>
   55 #include <sys/sysctl.h>
   56 #include <sys/vnode.h>
   57 #include <sys/signalvar.h>
   58 
   59 #include <vm/vm.h>
   60 #include <vm/vm_extern.h>
   61 #include <vm/uma.h>
   62 
   63 #include <net/if.h>
   64 #include <net/route.h>
   65 #include <netinet/in.h>
   66 
   67 #include <rpc/rpcclnt.h>
   68 
   69 #include <nfs/rpcv2.h>
   70 #include <nfs/nfsproto.h>
   71 #include <nfsclient/nfs.h>
   72 #include <nfsclient/nfsnode.h>
   73 #include <nfsclient/nfsmount.h>
   74 #include <nfs/xdr_subs.h>
   75 #include <nfsclient/nfsm_subs.h>
   76 #include <nfsclient/nfsdiskless.h>
   77 
   78 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header");
   79 MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle");
   80 MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data");
   81 MALLOC_DEFINE(M_NFSHASH, "NFS hash", "NFS hash tables");
   82 MALLOC_DEFINE(M_NFSDIRECTIO, "NFS DirectIO", "NFS Direct IO async write state");
   83 
   84 uma_zone_t nfsmount_zone;
   85 
   86 struct nfsstats nfsstats;
   87 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem");
   88 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RW,
   89         &nfsstats, nfsstats, "S,nfsstats");
   90 static int nfs_ip_paranoia = 1;
   91 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW,
   92     &nfs_ip_paranoia, 0, "");
   93 #ifdef NFS_DEBUG
   94 int nfs_debug;
   95 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, "");
   96 #endif
   97 static int nfs_tprintf_initial_delay = NFS_TPRINTF_INITIAL_DELAY;
   98 SYSCTL_INT(_vfs_nfs, NFS_TPRINTF_INITIAL_DELAY,
   99         downdelayinitial, CTLFLAG_RW, &nfs_tprintf_initial_delay, 0, "");
  100 /* how long between console messages "nfs server foo not responding" */
  101 static int nfs_tprintf_delay = NFS_TPRINTF_DELAY;
  102 SYSCTL_INT(_vfs_nfs, NFS_TPRINTF_DELAY,
  103         downdelayinterval, CTLFLAG_RW, &nfs_tprintf_delay, 0, "");
  104 
  105 static int      nfs_iosize(struct nfsmount *nmp);
  106 static void     nfs_decode_args(struct mount *mp, struct nfsmount *nmp, struct nfs_args *argp);
  107 static int      mountnfs(struct nfs_args *, struct mount *,
  108                     struct sockaddr *, char *, struct vnode **,
  109                     struct ucred *cred);
  110 static vfs_mount_t nfs_mount;
  111 static vfs_cmount_t nfs_cmount;
  112 static vfs_unmount_t nfs_unmount;
  113 static vfs_root_t nfs_root;
  114 static vfs_statfs_t nfs_statfs;
  115 static vfs_sync_t nfs_sync;
  116 static vfs_sysctl_t nfs_sysctl;
  117 
  118 /*
  119  * nfs vfs operations.
  120  */
  121 static struct vfsops nfs_vfsops = {
  122         .vfs_init =             nfs_init,
  123         .vfs_mount =            nfs_mount,
  124         .vfs_cmount =           nfs_cmount,
  125         .vfs_root =             nfs_root,
  126         .vfs_statfs =           nfs_statfs,
  127         .vfs_sync =             nfs_sync,
  128         .vfs_uninit =           nfs_uninit,
  129         .vfs_unmount =          nfs_unmount,
  130         .vfs_sysctl =           nfs_sysctl,
  131 };
  132 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK);
  133 
  134 /* So that loader and kldload(2) can find us, wherever we are.. */
  135 MODULE_VERSION(nfs, 1);
  136 
  137 static struct nfs_rpcops nfs_rpcops = {
  138         nfs_readrpc,
  139         nfs_writerpc,
  140         nfs_writebp,
  141         nfs_readlinkrpc,
  142         nfs_invaldir,
  143         nfs_commit,
  144 };
  145 
  146 /*
  147  * This structure must be filled in by a primary bootstrap or bootstrap
  148  * server for a diskless/dataless machine. It is initialized below just
  149  * to ensure that it is allocated to initialized data (.data not .bss).
  150  */
  151 struct nfs_diskless nfs_diskless = { { { 0 } } };
  152 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } };
  153 int nfs_diskless_valid = 0;
  154 
  155 SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD,
  156         &nfs_diskless_valid, 0, "");
  157 
  158 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD,
  159         nfsv3_diskless.root_hostnam, 0, "");
  160 
  161 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD,
  162         &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr,
  163         "%Ssockaddr_in", "");
  164 
  165 
  166 void            nfsargs_ntoh(struct nfs_args *);
  167 static int      nfs_mountdiskless(char *, int,
  168                     struct sockaddr_in *, struct nfs_args *,
  169                     struct thread *, struct vnode **, struct mount *);
  170 static void     nfs_convert_diskless(void);
  171 static void     nfs_convert_oargs(struct nfs_args *args,
  172                     struct onfs_args *oargs);
  173 
  174 static int
  175 nfs_iosize(struct nfsmount *nmp)
  176 {
  177         int iosize;
  178 
  179         /*
  180          * Calculate the size used for io buffers.  Use the larger
  181          * of the two sizes to minimise nfs requests but make sure
  182          * that it is at least one VM page to avoid wasting buffer
  183          * space.
  184          */
  185         iosize = max(nmp->nm_rsize, nmp->nm_wsize);
  186         if (iosize < PAGE_SIZE) iosize = PAGE_SIZE;
  187         return iosize;
  188 }
  189 
  190 static void
  191 nfs_convert_oargs(struct nfs_args *args, struct onfs_args *oargs)
  192 {
  193 
  194         args->version = NFS_ARGSVERSION;
  195         args->addr = oargs->addr;
  196         args->addrlen = oargs->addrlen;
  197         args->sotype = oargs->sotype;
  198         args->proto = oargs->proto;
  199         args->fh = oargs->fh;
  200         args->fhsize = oargs->fhsize;
  201         args->flags = oargs->flags;
  202         args->wsize = oargs->wsize;
  203         args->rsize = oargs->rsize;
  204         args->readdirsize = oargs->readdirsize;
  205         args->timeo = oargs->timeo;
  206         args->retrans = oargs->retrans;
  207         args->maxgrouplist = oargs->maxgrouplist;
  208         args->readahead = oargs->readahead;
  209         args->deadthresh = oargs->deadthresh;
  210         args->hostname = oargs->hostname;
  211 }
  212 
  213 static void
  214 nfs_convert_diskless(void)
  215 {
  216 
  217         bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif,
  218                 sizeof(struct ifaliasreq));
  219         bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway,
  220                 sizeof(struct sockaddr_in));
  221         nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args);
  222         if (nfsv3_diskless.root_args.flags & NFSMNT_NFSV3) {
  223                 nfsv3_diskless.root_fhsize = NFSX_V3FH;
  224                 bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V3FH);
  225         } else {
  226                 nfsv3_diskless.root_fhsize = NFSX_V2FH;
  227                 bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V2FH);
  228         }
  229         bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr,
  230                 sizeof(struct sockaddr_in));
  231         bcopy(nfs_diskless.root_hostnam, nfsv3_diskless.root_hostnam, MNAMELEN);
  232         nfsv3_diskless.root_time = nfs_diskless.root_time;
  233         bcopy(nfs_diskless.my_hostnam, nfsv3_diskless.my_hostnam,
  234                 MAXHOSTNAMELEN);
  235         nfs_diskless_valid = 3;
  236 }
  237 
  238 /*
  239  * nfs statfs call
  240  */
  241 static int
  242 nfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
  243 {
  244         struct vnode *vp;
  245         struct nfs_statfs *sfp;
  246         caddr_t bpos, dpos;
  247         struct nfsmount *nmp = VFSTONFS(mp);
  248         int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr;
  249         struct mbuf *mreq, *mrep, *md, *mb;
  250         struct nfsnode *np;
  251         u_quad_t tquad;
  252 
  253 #ifndef nolint
  254         sfp = NULL;
  255 #endif
  256         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, LK_EXCLUSIVE);
  257         if (error)
  258                 return (error);
  259         vp = NFSTOV(np);
  260         if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0)
  261                 (void)nfs_fsinfo(nmp, vp, td->td_ucred, td);
  262         nfsstats.rpccnt[NFSPROC_FSSTAT]++;
  263         mreq = nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3));
  264         mb = mreq;
  265         bpos = mtod(mb, caddr_t);
  266         nfsm_fhtom(vp, v3);
  267         nfsm_request(vp, NFSPROC_FSSTAT, td, td->td_ucred);
  268         if (v3)
  269                 nfsm_postop_attr(vp, retattr);
  270         if (error) {
  271                 if (mrep != NULL)
  272                         m_freem(mrep);
  273                 goto nfsmout;
  274         }
  275         sfp = nfsm_dissect(struct nfs_statfs *, NFSX_STATFS(v3));
  276         sbp->f_iosize = nfs_iosize(nmp);
  277         if (v3) {
  278                 sbp->f_bsize = NFS_FABLKSIZE;
  279                 tquad = fxdr_hyper(&sfp->sf_tbytes);
  280                 sbp->f_blocks = tquad / NFS_FABLKSIZE;
  281                 tquad = fxdr_hyper(&sfp->sf_fbytes);
  282                 sbp->f_bfree = tquad / NFS_FABLKSIZE;
  283                 tquad = fxdr_hyper(&sfp->sf_abytes);
  284                 sbp->f_bavail = tquad / NFS_FABLKSIZE;
  285                 sbp->f_files = (fxdr_unsigned(int32_t,
  286                     sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff);
  287                 sbp->f_ffree = (fxdr_unsigned(int32_t,
  288                     sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff);
  289         } else {
  290                 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
  291                 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
  292                 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
  293                 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
  294                 sbp->f_files = 0;
  295                 sbp->f_ffree = 0;
  296         }
  297         m_freem(mrep);
  298 nfsmout:
  299         vput(vp);
  300         return (error);
  301 }
  302 
  303 /*
  304  * nfs version 3 fsinfo rpc call
  305  */
  306 int
  307 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct ucred *cred,
  308     struct thread *td)
  309 {
  310         struct nfsv3_fsinfo *fsp;
  311         u_int32_t pref, max;
  312         caddr_t bpos, dpos;
  313         int error = 0, retattr;
  314         struct mbuf *mreq, *mrep, *md, *mb;
  315         u_int64_t maxfsize;
  316 
  317         nfsstats.rpccnt[NFSPROC_FSINFO]++;
  318         mreq = nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1));
  319         mb = mreq;
  320         bpos = mtod(mb, caddr_t);
  321         nfsm_fhtom(vp, 1);
  322         nfsm_request(vp, NFSPROC_FSINFO, td, cred);
  323         nfsm_postop_attr(vp, retattr);
  324         if (!error) {
  325                 fsp = nfsm_dissect(struct nfsv3_fsinfo *, NFSX_V3FSINFO);
  326                 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
  327                 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
  328                         nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
  329                                 ~(NFS_FABLKSIZE - 1);
  330                 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
  331                 if (max < nmp->nm_wsize && max > 0) {
  332                         nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
  333                         if (nmp->nm_wsize == 0)
  334                                 nmp->nm_wsize = max;
  335                 }
  336                 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
  337                 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
  338                         nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
  339                                 ~(NFS_FABLKSIZE - 1);
  340                 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
  341                 if (max < nmp->nm_rsize && max > 0) {
  342                         nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
  343                         if (nmp->nm_rsize == 0)
  344                                 nmp->nm_rsize = max;
  345                 }
  346                 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
  347                 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ)
  348                         nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) &
  349                                 ~(NFS_DIRBLKSIZ - 1);
  350                 if (max < nmp->nm_readdirsize && max > 0) {
  351                         nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1);
  352                         if (nmp->nm_readdirsize == 0)
  353                                 nmp->nm_readdirsize = max;
  354                 }
  355                 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
  356                 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
  357                         nmp->nm_maxfilesize = maxfsize;
  358                 nmp->nm_mountp->mnt_stat.f_iosize = nfs_iosize(nmp);
  359                 nmp->nm_state |= NFSSTA_GOTFSINFO;
  360         }
  361         m_freem(mrep);
  362 nfsmout:
  363         return (error);
  364 }
  365 
  366 /*
  367  * Mount a remote root fs via. nfs. This depends on the info in the
  368  * nfs_diskless structure that has been filled in properly by some primary
  369  * bootstrap.
  370  * It goes something like this:
  371  * - do enough of "ifconfig" by calling ifioctl() so that the system
  372  *   can talk to the server
  373  * - If nfs_diskless.mygateway is filled in, use that address as
  374  *   a default gateway.
  375  * - build the rootfs mount point and call mountnfs() to do the rest.
  376  *
  377  * It is assumed to be safe to read, modify, and write the nfsv3_diskless
  378  * structure, as well as other global NFS client variables here, as
  379  * nfs_mountroot() will be called once in the boot before any other NFS
  380  * client activity occurs.
  381  */
  382 int
  383 nfs_mountroot(struct mount *mp, struct thread *td)
  384 {
  385         struct nfsv3_diskless *nd = &nfsv3_diskless;
  386         struct socket *so;
  387         struct vnode *vp;
  388         struct ifreq ir;
  389         int error, i;
  390         u_long l;
  391         char buf[128];
  392         char *cp;
  393 
  394         NET_ASSERT_GIANT();
  395 
  396 #if defined(BOOTP_NFSROOT) && defined(BOOTP)
  397         bootpc_init();          /* use bootp to get nfs_diskless filled in */
  398 #elif defined(NFS_ROOT)
  399         nfs_setup_diskless();
  400 #endif
  401 
  402         if (nfs_diskless_valid == 0)
  403                 return (-1);
  404         if (nfs_diskless_valid == 1)
  405                 nfs_convert_diskless();
  406 
  407         /*
  408          * XXX splnet, so networks will receive...
  409          */
  410         splnet();
  411 
  412         /*
  413          * Do enough of ifconfig(8) so that the critical net interface can
  414          * talk to the server.
  415          */
  416         error = socreate(nd->myif.ifra_addr.sa_family, &so, nd->root_args.sotype, 0,
  417             td->td_ucred, td);
  418         if (error)
  419                 panic("nfs_mountroot: socreate(%04x): %d",
  420                         nd->myif.ifra_addr.sa_family, error);
  421 
  422 #if 0 /* XXX Bad idea */
  423         /*
  424          * We might not have been told the right interface, so we pass
  425          * over the first ten interfaces of the same kind, until we get
  426          * one of them configured.
  427          */
  428 
  429         for (i = strlen(nd->myif.ifra_name) - 1;
  430                 nd->myif.ifra_name[i] >= '' &&
  431                 nd->myif.ifra_name[i] <= '9';
  432                 nd->myif.ifra_name[i] ++) {
  433                 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
  434                 if(!error)
  435                         break;
  436         }
  437 #endif
  438         error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
  439         if (error)
  440                 panic("nfs_mountroot: SIOCAIFADDR: %d", error);
  441         if ((cp = getenv("boot.netif.mtu")) != NULL) {
  442                 ir.ifr_mtu = strtol(cp, NULL, 10);
  443                 bcopy(nd->myif.ifra_name, ir.ifr_name, IFNAMSIZ);
  444                 freeenv(cp);
  445                 error = ifioctl(so, SIOCSIFMTU, (caddr_t)&ir, td);
  446                 if (error)
  447                         printf("nfs_mountroot: SIOCSIFMTU: %d", error);
  448         }
  449         soclose(so);
  450 
  451         /*
  452          * If the gateway field is filled in, set it as the default route.
  453          * Note that pxeboot will set a default route of 0 if the route
  454          * is not set by the DHCP server.  Check also for a value of 0
  455          * to avoid panicking inappropriately in that situation.
  456          */
  457         if (nd->mygateway.sin_len != 0 &&
  458             nd->mygateway.sin_addr.s_addr != 0) {
  459                 struct sockaddr_in mask, sin;
  460 
  461                 bzero((caddr_t)&mask, sizeof(mask));
  462                 sin = mask;
  463                 sin.sin_family = AF_INET;
  464                 sin.sin_len = sizeof(sin);
  465                 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin,
  466                     (struct sockaddr *)&nd->mygateway,
  467                     (struct sockaddr *)&mask,
  468                     RTF_UP | RTF_GATEWAY, NULL);
  469                 if (error)
  470                         panic("nfs_mountroot: RTM_ADD: %d", error);
  471         }
  472 
  473         /*
  474          * Create the rootfs mount point.
  475          */
  476         nd->root_args.fh = nd->root_fh;
  477         nd->root_args.fhsize = nd->root_fhsize;
  478         l = ntohl(nd->root_saddr.sin_addr.s_addr);
  479         snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s",
  480                 (l >> 24) & 0xff, (l >> 16) & 0xff,
  481                 (l >>  8) & 0xff, (l >>  0) & 0xff, nd->root_hostnam);
  482         printf("NFS ROOT: %s\n", buf);
  483         if ((error = nfs_mountdiskless(buf, MNT_RDONLY,
  484             &nd->root_saddr, &nd->root_args, td, &vp, mp)) != 0) {
  485                 return (error);
  486         }
  487 
  488         /*
  489          * This is not really an nfs issue, but it is much easier to
  490          * set hostname here and then let the "/etc/rc.xxx" files
  491          * mount the right /var based upon its preset value.
  492          */
  493         bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN);
  494         hostname[MAXHOSTNAMELEN - 1] = '\0';
  495         for (i = 0; i < MAXHOSTNAMELEN; i++)
  496                 if (hostname[i] == '\0')
  497                         break;
  498         inittodr(ntohl(nd->root_time));
  499         return (0);
  500 }
  501 
  502 /*
  503  * Internal version of mount system call for diskless setup.
  504  */
  505 static int
  506 nfs_mountdiskless(char *path, int mountflag,
  507     struct sockaddr_in *sin, struct nfs_args *args, struct thread *td,
  508     struct vnode **vpp, struct mount *mp)
  509 {
  510         struct sockaddr *nam;
  511         int error;
  512 
  513         MNT_ILOCK(mp);
  514         mp->mnt_kern_flag = 0;
  515         mp->mnt_flag = mountflag;
  516         MNT_IUNLOCK(mp);
  517         nam = sodupsockaddr((struct sockaddr *)sin, M_WAITOK);
  518         if ((error = mountnfs(args, mp, nam, path, vpp,
  519             td->td_ucred)) != 0) {
  520                 printf("nfs_mountroot: mount %s on /: %d\n", path, error);
  521                 return (error);
  522         }
  523         return (0);
  524 }
  525 
  526 static void
  527 nfs_decode_args(struct mount *mp, struct nfsmount *nmp, struct nfs_args *argp)
  528 {
  529         int s;
  530         int adjsock;
  531         int maxio;
  532 
  533         s = splnet();
  534 
  535         /*
  536          * Set read-only flag if requested; otherwise, clear it if this is
  537          * an update.  If this is not an update, then either the read-only
  538          * flag is already clear, or this is a root mount and it was set
  539          * intentionally at some previous point.
  540          */
  541         if (vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL) == 0) {
  542                 MNT_ILOCK(mp);
  543                 mp->mnt_flag |= MNT_RDONLY;
  544                 MNT_IUNLOCK(mp);
  545         } else if (mp->mnt_flag & MNT_UPDATE) {
  546                 MNT_ILOCK(mp);
  547                 mp->mnt_flag &= ~MNT_RDONLY;
  548                 MNT_IUNLOCK(mp);
  549         }
  550 
  551         /*
  552          * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
  553          * no sense in that context.  Also, set up appropriate retransmit
  554          * and soft timeout behavior.
  555          */
  556         if (argp->sotype == SOCK_STREAM) {
  557                 nmp->nm_flag &= ~NFSMNT_NOCONN;
  558                 nmp->nm_flag |= NFSMNT_DUMBTIMR;
  559                 nmp->nm_timeo = NFS_MAXTIMEO;
  560                 nmp->nm_retry = NFS_RETRANS_TCP;
  561         }
  562 
  563         /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */
  564         if ((argp->flags & NFSMNT_NFSV3) == 0)
  565                 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
  566 
  567         /* Re-bind if rsrvd port requested and wasn't on one */
  568         adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
  569                   && (argp->flags & NFSMNT_RESVPORT);
  570         /* Also re-bind if we're switching to/from a connected UDP socket */
  571         adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
  572                     (argp->flags & NFSMNT_NOCONN));
  573 
  574         /* Update flags atomically.  Don't change the lock bits. */
  575         nmp->nm_flag = argp->flags | nmp->nm_flag;
  576         splx(s);
  577 
  578         if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
  579                 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
  580                 if (nmp->nm_timeo < NFS_MINTIMEO)
  581                         nmp->nm_timeo = NFS_MINTIMEO;
  582                 else if (nmp->nm_timeo > NFS_MAXTIMEO)
  583                         nmp->nm_timeo = NFS_MAXTIMEO;
  584         }
  585 
  586         if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
  587                 nmp->nm_retry = argp->retrans;
  588                 if (nmp->nm_retry > NFS_MAXREXMIT)
  589                         nmp->nm_retry = NFS_MAXREXMIT;
  590         }
  591 
  592         if (argp->flags & NFSMNT_NFSV3) {
  593                 if (argp->sotype == SOCK_DGRAM)
  594                         maxio = NFS_MAXDGRAMDATA;
  595                 else
  596                         maxio = NFS_MAXDATA;
  597         } else
  598                 maxio = NFS_V2MAXDATA;
  599 
  600         if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
  601                 nmp->nm_wsize = argp->wsize;
  602                 /* Round down to multiple of blocksize */
  603                 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
  604                 if (nmp->nm_wsize <= 0)
  605                         nmp->nm_wsize = NFS_FABLKSIZE;
  606         }
  607         if (nmp->nm_wsize > maxio)
  608                 nmp->nm_wsize = maxio;
  609         if (nmp->nm_wsize > MAXBSIZE)
  610                 nmp->nm_wsize = MAXBSIZE;
  611 
  612         if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
  613                 nmp->nm_rsize = argp->rsize;
  614                 /* Round down to multiple of blocksize */
  615                 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
  616                 if (nmp->nm_rsize <= 0)
  617                         nmp->nm_rsize = NFS_FABLKSIZE;
  618         }
  619         if (nmp->nm_rsize > maxio)
  620                 nmp->nm_rsize = maxio;
  621         if (nmp->nm_rsize > MAXBSIZE)
  622                 nmp->nm_rsize = MAXBSIZE;
  623 
  624         if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
  625                 nmp->nm_readdirsize = argp->readdirsize;
  626         }
  627         if (nmp->nm_readdirsize > maxio)
  628                 nmp->nm_readdirsize = maxio;
  629         if (nmp->nm_readdirsize > nmp->nm_rsize)
  630                 nmp->nm_readdirsize = nmp->nm_rsize;
  631 
  632         if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0)
  633                 nmp->nm_acregmin = argp->acregmin;
  634         else
  635                 nmp->nm_acregmin = NFS_MINATTRTIMO;
  636         if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0)
  637                 nmp->nm_acregmax = argp->acregmax;
  638         else
  639                 nmp->nm_acregmax = NFS_MAXATTRTIMO;
  640         if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0)
  641                 nmp->nm_acdirmin = argp->acdirmin;
  642         else
  643                 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO;
  644         if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0)
  645                 nmp->nm_acdirmax = argp->acdirmax;
  646         else
  647                 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO;
  648         if (nmp->nm_acdirmin > nmp->nm_acdirmax)
  649                 nmp->nm_acdirmin = nmp->nm_acdirmax;
  650         if (nmp->nm_acregmin > nmp->nm_acregmax)
  651                 nmp->nm_acregmin = nmp->nm_acregmax;
  652 
  653         if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) {
  654                 if (argp->maxgrouplist <= NFS_MAXGRPS)
  655                         nmp->nm_numgrps = argp->maxgrouplist;
  656                 else
  657                         nmp->nm_numgrps = NFS_MAXGRPS;
  658         }
  659         if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) {
  660                 if (argp->readahead <= NFS_MAXRAHEAD)
  661                         nmp->nm_readahead = argp->readahead;
  662                 else
  663                         nmp->nm_readahead = NFS_MAXRAHEAD;
  664         }
  665         if ((argp->flags & NFSMNT_WCOMMITSIZE) && argp->wcommitsize >= 0) {
  666                 if (argp->wcommitsize < nmp->nm_wsize)
  667                         nmp->nm_wcommitsize = nmp->nm_wsize;
  668                 else
  669                         nmp->nm_wcommitsize = argp->wcommitsize;
  670         }
  671         if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 0) {
  672                 if (argp->deadthresh <= NFS_MAXDEADTHRESH)
  673                         nmp->nm_deadthresh = argp->deadthresh;
  674                 else
  675                         nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
  676         }
  677 
  678         adjsock |= ((nmp->nm_sotype != argp->sotype) ||
  679                     (nmp->nm_soproto != argp->proto));
  680         nmp->nm_sotype = argp->sotype;
  681         nmp->nm_soproto = argp->proto;
  682 
  683         if (nmp->nm_so && adjsock) {
  684                 nfs_safedisconnect(nmp);
  685                 if (nmp->nm_sotype == SOCK_DGRAM)
  686                         while (nfs_connect(nmp, NULL)) {
  687                                 printf("nfs_args: retrying connect\n");
  688                                 (void) tsleep((caddr_t)&lbolt,
  689                                               PSOCK, "nfscon", 0);
  690                         }
  691         }
  692 }
  693 
  694 static const char *nfs_opts[] = { "from", "nfs_args", NULL };
  695 
  696 /*
  697  * VFS Operations.
  698  *
  699  * mount system call
  700  * It seems a bit dumb to copyinstr() the host and path here and then
  701  * bcopy() them in mountnfs(), but I wanted to detect errors before
  702  * doing the sockargs() call because sockargs() allocates an mbuf and
  703  * an error after that means that I have to release the mbuf.
  704  */
  705 /* ARGSUSED */
  706 static int
  707 nfs_mount(struct mount *mp, struct thread *td)
  708 {
  709         int error;
  710         struct nfs_args args;
  711         struct sockaddr *nam;
  712         struct vnode *vp;
  713         char hst[MNAMELEN];
  714         size_t len;
  715         u_char nfh[NFSX_V3FHMAX];
  716 
  717         if (vfs_filteropt(mp->mnt_optnew, nfs_opts))
  718                 return (EINVAL);
  719 
  720         if (mp->mnt_flag & MNT_ROOTFS)
  721                 return (nfs_mountroot(mp, td));
  722 
  723         error = vfs_copyopt(mp->mnt_optnew, "nfs_args", &args, sizeof args);
  724         if (error)
  725                 return (error);
  726 
  727         if (args.version != NFS_ARGSVERSION) {
  728                 return (EPROGMISMATCH);
  729         }
  730         if (mp->mnt_flag & MNT_UPDATE) {
  731                 struct nfsmount *nmp = VFSTONFS(mp);
  732 
  733                 if (nmp == NULL)
  734                         return (EIO);
  735                 /*
  736                  * When doing an update, we can't change from or to
  737                  * v3, switch lockd strategies or change cookie translation
  738                  */
  739                 args.flags = (args.flags &
  740                     ~(NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/)) |
  741                     (nmp->nm_flag &
  742                         (NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/));
  743                 nfs_decode_args(mp, nmp, &args);
  744                 return (0);
  745         }
  746 
  747         /*
  748          * Make the nfs_ip_paranoia sysctl serve as the default connection
  749          * or no-connection mode for those protocols that support 
  750          * no-connection mode (the flag will be cleared later for protocols
  751          * that do not support no-connection mode).  This will allow a client
  752          * to receive replies from a different IP then the request was
  753          * sent to.  Note: default value for nfs_ip_paranoia is 1 (paranoid),
  754          * not 0.
  755          */
  756         if (nfs_ip_paranoia == 0)
  757                 args.flags |= NFSMNT_NOCONN;
  758         if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX)
  759                 return (EINVAL);
  760         error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
  761         if (error)
  762                 return (error);
  763         error = copyinstr(args.hostname, hst, MNAMELEN-1, &len);
  764         if (error)
  765                 return (error);
  766         bzero(&hst[len], MNAMELEN - len);
  767         /* sockargs() call must be after above copyin() calls */
  768         error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen);
  769         if (error)
  770                 return (error);
  771         args.fh = nfh;
  772         error = mountnfs(&args, mp, nam, hst, &vp, td->td_ucred);
  773 
  774         if (!error) {
  775                 MNT_ILOCK(mp);
  776                 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED;
  777                 MNT_IUNLOCK(mp);
  778         }
  779 
  780         return (error);
  781 }
  782 
  783 
  784 /*
  785  * VFS Operations.
  786  *
  787  * mount system call
  788  * It seems a bit dumb to copyinstr() the host and path here and then
  789  * bcopy() them in mountnfs(), but I wanted to detect errors before
  790  * doing the sockargs() call because sockargs() allocates an mbuf and
  791  * an error after that means that I have to release the mbuf.
  792  */
  793 /* ARGSUSED */
  794 static int
  795 nfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td)
  796 {
  797         int error;
  798         struct nfs_args args;
  799 
  800         error = copyin(data, &args, sizeof (struct nfs_args));
  801         if (error)
  802                 return (error);
  803 
  804         ma = mount_arg(ma, "nfs_args", &args, sizeof args);
  805 
  806         error = kernel_mount(ma, flags);
  807 
  808         return (error);
  809 }
  810 
  811 /*
  812  * Common code for mount and mountroot
  813  */
  814 static int
  815 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam,
  816     char *hst, struct vnode **vpp, struct ucred *cred)
  817 {
  818         struct nfsmount *nmp;
  819         struct nfsnode *np;
  820         int error;
  821         struct vattr attrs;
  822 
  823         if (mp->mnt_flag & MNT_UPDATE) {
  824                 nmp = VFSTONFS(mp);
  825                 /* update paths, file handles, etc, here        XXX */
  826                 FREE(nam, M_SONAME);
  827                 return (0);
  828         } else {
  829                 nmp = uma_zalloc(nfsmount_zone, M_WAITOK);
  830                 bzero((caddr_t)nmp, sizeof (struct nfsmount));
  831                 TAILQ_INIT(&nmp->nm_bufq);
  832                 mp->mnt_data = (qaddr_t)nmp;
  833         }
  834         vfs_getnewfsid(mp);
  835         nmp->nm_mountp = mp;
  836 
  837         /*
  838          * V2 can only handle 32 bit filesizes.  A 4GB-1 limit may be too
  839          * high, depending on whether we end up with negative offsets in
  840          * the client or server somewhere.  2GB-1 may be safer.
  841          *
  842          * For V3, nfs_fsinfo will adjust this as necessary.  Assume maximum
  843          * that we can handle until we find out otherwise.
  844          * XXX Our "safe" limit on the client is what we can store in our
  845          * buffer cache using signed(!) block numbers.
  846          */
  847         if ((argp->flags & NFSMNT_NFSV3) == 0)
  848                 nmp->nm_maxfilesize = 0xffffffffLL;
  849         else
  850                 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
  851 
  852         nmp->nm_timeo = NFS_TIMEO;
  853         nmp->nm_retry = NFS_RETRANS;
  854         if ((argp->flags & NFSMNT_NFSV3) && argp->sotype == SOCK_STREAM) {
  855                 nmp->nm_wsize = nmp->nm_rsize = NFS_MAXDATA;
  856         } else {
  857                 nmp->nm_wsize = NFS_WSIZE;
  858                 nmp->nm_rsize = NFS_RSIZE;
  859         }
  860         nmp->nm_wcommitsize = hibufspace / (desiredvnodes / 1000);
  861         nmp->nm_readdirsize = NFS_READDIRSIZE;
  862         nmp->nm_numgrps = NFS_MAXGRPS;
  863         nmp->nm_readahead = NFS_DEFRAHEAD;
  864         nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
  865         nmp->nm_tprintf_delay = nfs_tprintf_delay;
  866         if (nmp->nm_tprintf_delay < 0)
  867                 nmp->nm_tprintf_delay = 0;
  868         nmp->nm_tprintf_initial_delay = nfs_tprintf_initial_delay;
  869         if (nmp->nm_tprintf_initial_delay < 0)
  870                 nmp->nm_tprintf_initial_delay = 0;
  871         nmp->nm_fhsize = argp->fhsize;
  872         bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize);
  873         bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
  874         nmp->nm_nam = nam;
  875         /* Set up the sockets and per-host congestion */
  876         nmp->nm_sotype = argp->sotype;
  877         nmp->nm_soproto = argp->proto;
  878         nmp->nm_rpcops = &nfs_rpcops;
  879 
  880         nfs_decode_args(mp, nmp, argp);
  881 
  882         if (nmp->nm_sotype == SOCK_STREAM)
  883                 mtx_init(&nmp->nm_nfstcpstate.mtx, "NFS/TCP state lock", 
  884                          NULL, MTX_DEF);                
  885 
  886         /*
  887          * For Connection based sockets (TCP,...) defer the connect until
  888          * the first request, in case the server is not responding.
  889          */
  890         if (nmp->nm_sotype == SOCK_DGRAM &&
  891                 (error = nfs_connect(nmp, NULL)))
  892                 goto bad;
  893 
  894         /*
  895          * This is silly, but it has to be set so that vinifod() works.
  896          * We do not want to do an nfs_statfs() here since we can get
  897          * stuck on a dead server and we are holding a lock on the mount
  898          * point.
  899          */
  900         mp->mnt_stat.f_iosize = nfs_iosize(nmp);
  901         /*
  902          * A reference count is needed on the nfsnode representing the
  903          * remote root.  If this object is not persistent, then backward
  904          * traversals of the mount point (i.e. "..") will not work if
  905          * the nfsnode gets flushed out of the cache. Ufs does not have
  906          * this problem, because one can identify root inodes by their
  907          * number == ROOTINO (2).
  908          */
  909         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, LK_EXCLUSIVE);
  910         if (error)
  911                 goto bad;
  912         *vpp = NFSTOV(np);
  913 
  914         /*
  915          * Get file attributes and transfer parameters for the
  916          * mountpoint.  This has the side effect of filling in
  917          * (*vpp)->v_type with the correct value.
  918          */
  919         if (argp->flags & NFSMNT_NFSV3)
  920                 nfs_fsinfo(nmp, *vpp, curthread->td_ucred, curthread);
  921         else
  922                 VOP_GETATTR(*vpp, &attrs, curthread->td_ucred, curthread);
  923 
  924         /*
  925          * Lose the lock but keep the ref.
  926          */
  927         VOP_UNLOCK(*vpp, 0, curthread);
  928 
  929         return (0);
  930 bad:
  931         if (nmp->nm_sotype == SOCK_STREAM)
  932                 mtx_destroy(&nmp->nm_nfstcpstate.mtx);
  933         nfs_disconnect(nmp);
  934         uma_zfree(nfsmount_zone, nmp);
  935         FREE(nam, M_SONAME);
  936         return (error);
  937 }
  938 
  939 /*
  940  * unmount system call
  941  */
  942 static int
  943 nfs_unmount(struct mount *mp, int mntflags, struct thread *td)
  944 {
  945         struct nfsmount *nmp;
  946         int error, flags = 0;
  947 
  948         if (mntflags & MNT_FORCE)
  949                 flags |= FORCECLOSE;
  950         nmp = VFSTONFS(mp);
  951         /*
  952          * Goes something like this..
  953          * - Call vflush() to clear out vnodes for this filesystem
  954          * - Close the socket
  955          * - Free up the data structures
  956          */
  957         /* In the forced case, cancel any outstanding requests. */
  958         if (flags & FORCECLOSE) {
  959                 error = nfs_nmcancelreqs(nmp);
  960                 if (error)
  961                         return (error);
  962         }
  963         /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */
  964         error = vflush(mp, 1, flags, td);
  965         if (error)
  966                 return (error);
  967 
  968         /*
  969          * We are now committed to the unmount.
  970          */
  971         nfs_disconnect(nmp);
  972         FREE(nmp->nm_nam, M_SONAME);
  973 
  974         if (nmp->nm_sotype == SOCK_STREAM)
  975                 mtx_destroy(&nmp->nm_nfstcpstate.mtx);
  976         
  977         uma_zfree(nfsmount_zone, nmp);
  978         return (0);
  979 }
  980 
  981 /*
  982  * Return root of a filesystem
  983  */
  984 static int
  985 nfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td)
  986 {
  987         struct vnode *vp;
  988         struct nfsmount *nmp;
  989         struct nfsnode *np;
  990         int error;
  991 
  992         nmp = VFSTONFS(mp);
  993         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, flags);
  994         if (error)
  995                 return (error);
  996         vp = NFSTOV(np);
  997         /*
  998          * Get transfer parameters and attributes for root vnode once.
  999          */
 1000         if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0 &&
 1001             (nmp->nm_flag & NFSMNT_NFSV3)) {
 1002                 nfs_fsinfo(nmp, vp, curthread->td_ucred, curthread);
 1003         }
 1004         if (vp->v_type == VNON)
 1005             vp->v_type = VDIR;
 1006         vp->v_vflag |= VV_ROOT;
 1007         *vpp = vp;
 1008         return (0);
 1009 }
 1010 
 1011 /*
 1012  * Flush out the buffer cache
 1013  */
 1014 /* ARGSUSED */
 1015 static int
 1016 nfs_sync(struct mount *mp, int waitfor, struct thread *td)
 1017 {
 1018         struct vnode *vp, *mvp;
 1019         int error, allerror = 0;
 1020 
 1021         /*
 1022          * Force stale buffer cache information to be flushed.
 1023          */
 1024         MNT_ILOCK(mp);
 1025 loop:
 1026         MNT_VNODE_FOREACH(vp, mp, mvp) {
 1027                 VI_LOCK(vp);
 1028                 MNT_IUNLOCK(mp);
 1029                 if (VOP_ISLOCKED(vp, NULL) ||
 1030                     vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
 1031                     waitfor == MNT_LAZY) {
 1032                         VI_UNLOCK(vp);
 1033                         MNT_ILOCK(mp);
 1034                         continue;
 1035                 }
 1036                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
 1037                         MNT_ILOCK(mp);
 1038                         MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp);
 1039                         goto loop;
 1040                 }
 1041                 error = VOP_FSYNC(vp, waitfor, td);
 1042                 if (error)
 1043                         allerror = error;
 1044                 VOP_UNLOCK(vp, 0, td);
 1045                 vrele(vp);
 1046 
 1047                 MNT_ILOCK(mp);
 1048         }
 1049         MNT_IUNLOCK(mp);
 1050         return (allerror);
 1051 }
 1052 
 1053 static int
 1054 nfs_sysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
 1055 {
 1056         struct nfsmount *nmp = VFSTONFS(mp);
 1057         struct vfsquery vq;
 1058         int error;
 1059 
 1060         bzero(&vq, sizeof(vq));
 1061         switch (op) {
 1062 #if 0
 1063         case VFS_CTL_NOLOCKS:
 1064                 val = (nmp->nm_flag & NFSMNT_NOLOCKS) ? 1 : 0;
 1065                 if (req->oldptr != NULL) {
 1066                         error = SYSCTL_OUT(req, &val, sizeof(val));
 1067                         if (error)
 1068                                 return (error);
 1069                 }
 1070                 if (req->newptr != NULL) {
 1071                         error = SYSCTL_IN(req, &val, sizeof(val));
 1072                         if (error)
 1073                                 return (error);
 1074                         if (val)
 1075                                 nmp->nm_flag |= NFSMNT_NOLOCKS;
 1076                         else
 1077                                 nmp->nm_flag &= ~NFSMNT_NOLOCKS;
 1078                 }
 1079                 break;
 1080 #endif
 1081         case VFS_CTL_QUERY:
 1082                 if (nmp->nm_state & NFSSTA_TIMEO)
 1083                         vq.vq_flags |= VQ_NOTRESP;
 1084 #if 0
 1085                 if (!(nmp->nm_flag & NFSMNT_NOLOCKS) &&
 1086                     (nmp->nm_state & NFSSTA_LOCKTIMEO))
 1087                         vq.vq_flags |= VQ_NOTRESPLOCK;
 1088 #endif
 1089                 error = SYSCTL_OUT(req, &vq, sizeof(vq));
 1090                 break;
 1091         case VFS_CTL_TIMEO:
 1092                 if (req->oldptr != NULL) {
 1093                         error = SYSCTL_OUT(req, &nmp->nm_tprintf_initial_delay,
 1094                             sizeof(nmp->nm_tprintf_initial_delay));
 1095                         if (error)
 1096                                 return (error);
 1097                 }
 1098                 if (req->newptr != NULL) {
 1099                         error = vfs_suser(mp, req->td);
 1100                         if (error)
 1101                                 return (error);
 1102                         error = SYSCTL_IN(req, &nmp->nm_tprintf_initial_delay,
 1103                             sizeof(nmp->nm_tprintf_initial_delay));
 1104                         if (error)
 1105                                 return (error);
 1106                         if (nmp->nm_tprintf_initial_delay < 0)
 1107                                 nmp->nm_tprintf_initial_delay = 0;
 1108                 }
 1109                 break;
 1110         default:
 1111                 return (ENOTSUP);
 1112         }
 1113         return (0);
 1114 }

Cache object: dfb780e379ab91f7dc56ebfb877a9f90


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