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/6.0/sys/nfsclient/nfs_vfsops.c 147280 2005-06-10 23:50:41Z green $");
   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_RD,
   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         nfsv3_diskless.root_fhsize = NFSX_V2FH;
  223         bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V2FH);
  224         bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr,
  225                 sizeof(struct sockaddr_in));
  226         bcopy(nfs_diskless.root_hostnam, nfsv3_diskless.root_hostnam, MNAMELEN);
  227         nfsv3_diskless.root_time = nfs_diskless.root_time;
  228         bcopy(nfs_diskless.my_hostnam, nfsv3_diskless.my_hostnam,
  229                 MAXHOSTNAMELEN);
  230         nfs_diskless_valid = 3;
  231 }
  232 
  233 /*
  234  * nfs statfs call
  235  */
  236 static int
  237 nfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
  238 {
  239         struct vnode *vp;
  240         struct nfs_statfs *sfp;
  241         caddr_t bpos, dpos;
  242         struct nfsmount *nmp = VFSTONFS(mp);
  243         int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr;
  244         struct mbuf *mreq, *mrep, *md, *mb;
  245         struct nfsnode *np;
  246         u_quad_t tquad;
  247 
  248 #ifndef nolint
  249         sfp = NULL;
  250 #endif
  251         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
  252         if (error)
  253                 return (error);
  254         vp = NFSTOV(np);
  255         if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0)
  256                 (void)nfs_fsinfo(nmp, vp, td->td_ucred, td);
  257         nfsstats.rpccnt[NFSPROC_FSSTAT]++;
  258         mreq = nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3));
  259         mb = mreq;
  260         bpos = mtod(mb, caddr_t);
  261         nfsm_fhtom(vp, v3);
  262         nfsm_request(vp, NFSPROC_FSSTAT, td, td->td_ucred);
  263         if (v3)
  264                 nfsm_postop_attr(vp, retattr);
  265         if (error) {
  266                 if (mrep != NULL)
  267                         m_freem(mrep);
  268                 goto nfsmout;
  269         }
  270         sfp = nfsm_dissect(struct nfs_statfs *, NFSX_STATFS(v3));
  271         sbp->f_iosize = nfs_iosize(nmp);
  272         if (v3) {
  273                 sbp->f_bsize = NFS_FABLKSIZE;
  274                 tquad = fxdr_hyper(&sfp->sf_tbytes);
  275                 sbp->f_blocks = tquad / NFS_FABLKSIZE;
  276                 tquad = fxdr_hyper(&sfp->sf_fbytes);
  277                 sbp->f_bfree = tquad / NFS_FABLKSIZE;
  278                 tquad = fxdr_hyper(&sfp->sf_abytes);
  279                 sbp->f_bavail = tquad / NFS_FABLKSIZE;
  280                 sbp->f_files = (fxdr_unsigned(int32_t,
  281                     sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff);
  282                 sbp->f_ffree = (fxdr_unsigned(int32_t,
  283                     sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff);
  284         } else {
  285                 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
  286                 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
  287                 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
  288                 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
  289                 sbp->f_files = 0;
  290                 sbp->f_ffree = 0;
  291         }
  292         m_freem(mrep);
  293 nfsmout:
  294         vput(vp);
  295         return (error);
  296 }
  297 
  298 /*
  299  * nfs version 3 fsinfo rpc call
  300  */
  301 int
  302 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct ucred *cred,
  303     struct thread *td)
  304 {
  305         struct nfsv3_fsinfo *fsp;
  306         u_int32_t pref, max;
  307         caddr_t bpos, dpos;
  308         int error = 0, retattr;
  309         struct mbuf *mreq, *mrep, *md, *mb;
  310         u_int64_t maxfsize;
  311 
  312         nfsstats.rpccnt[NFSPROC_FSINFO]++;
  313         mreq = nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1));
  314         mb = mreq;
  315         bpos = mtod(mb, caddr_t);
  316         nfsm_fhtom(vp, 1);
  317         nfsm_request(vp, NFSPROC_FSINFO, td, cred);
  318         nfsm_postop_attr(vp, retattr);
  319         if (!error) {
  320                 fsp = nfsm_dissect(struct nfsv3_fsinfo *, NFSX_V3FSINFO);
  321                 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
  322                 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
  323                         nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
  324                                 ~(NFS_FABLKSIZE - 1);
  325                 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
  326                 if (max < nmp->nm_wsize && max > 0) {
  327                         nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
  328                         if (nmp->nm_wsize == 0)
  329                                 nmp->nm_wsize = max;
  330                 }
  331                 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
  332                 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
  333                         nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
  334                                 ~(NFS_FABLKSIZE - 1);
  335                 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
  336                 if (max < nmp->nm_rsize && max > 0) {
  337                         nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
  338                         if (nmp->nm_rsize == 0)
  339                                 nmp->nm_rsize = max;
  340                 }
  341                 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
  342                 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ)
  343                         nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) &
  344                                 ~(NFS_DIRBLKSIZ - 1);
  345                 if (max < nmp->nm_readdirsize && max > 0) {
  346                         nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1);
  347                         if (nmp->nm_readdirsize == 0)
  348                                 nmp->nm_readdirsize = max;
  349                 }
  350                 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
  351                 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
  352                         nmp->nm_maxfilesize = maxfsize;
  353                 nmp->nm_mountp->mnt_stat.f_iosize = nfs_iosize(nmp);
  354                 nmp->nm_state |= NFSSTA_GOTFSINFO;
  355         }
  356         m_freem(mrep);
  357 nfsmout:
  358         return (error);
  359 }
  360 
  361 /*
  362  * Mount a remote root fs via. nfs. This depends on the info in the
  363  * nfs_diskless structure that has been filled in properly by some primary
  364  * bootstrap.
  365  * It goes something like this:
  366  * - do enough of "ifconfig" by calling ifioctl() so that the system
  367  *   can talk to the server
  368  * - If nfs_diskless.mygateway is filled in, use that address as
  369  *   a default gateway.
  370  * - build the rootfs mount point and call mountnfs() to do the rest.
  371  *
  372  * It is assumed to be safe to read, modify, and write the nfsv3_diskless
  373  * structure, as well as other global NFS client variables here, as
  374  * nfs_mountroot() will be called once in the boot before any other NFS
  375  * client activity occurs.
  376  */
  377 int
  378 nfs_mountroot(struct mount *mp, struct thread *td)
  379 {
  380         struct nfsv3_diskless *nd = &nfsv3_diskless;
  381         struct socket *so;
  382         struct vnode *vp;
  383         int error, i;
  384         u_long l;
  385         char buf[128];
  386 
  387         NET_ASSERT_GIANT();
  388 
  389 #if defined(BOOTP_NFSROOT) && defined(BOOTP)
  390         bootpc_init();          /* use bootp to get nfs_diskless filled in */
  391 #elif defined(NFS_ROOT)
  392         nfs_setup_diskless();
  393 #endif
  394 
  395         if (nfs_diskless_valid == 0)
  396                 return (-1);
  397         if (nfs_diskless_valid == 1)
  398                 nfs_convert_diskless();
  399 
  400         /*
  401          * XXX splnet, so networks will receive...
  402          */
  403         splnet();
  404 
  405         /*
  406          * Do enough of ifconfig(8) so that the critical net interface can
  407          * talk to the server.
  408          */
  409         error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0,
  410             td->td_ucred, td);
  411         if (error)
  412                 panic("nfs_mountroot: socreate(%04x): %d",
  413                         nd->myif.ifra_addr.sa_family, error);
  414 
  415 #if 0 /* XXX Bad idea */
  416         /*
  417          * We might not have been told the right interface, so we pass
  418          * over the first ten interfaces of the same kind, until we get
  419          * one of them configured.
  420          */
  421 
  422         for (i = strlen(nd->myif.ifra_name) - 1;
  423                 nd->myif.ifra_name[i] >= '' &&
  424                 nd->myif.ifra_name[i] <= '9';
  425                 nd->myif.ifra_name[i] ++) {
  426                 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
  427                 if(!error)
  428                         break;
  429         }
  430 #endif
  431         error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
  432         if (error)
  433                 panic("nfs_mountroot: SIOCAIFADDR: %d", error);
  434         soclose(so);
  435 
  436         /*
  437          * If the gateway field is filled in, set it as the default route.
  438          * Note that pxeboot will set a default route of 0 if the route
  439          * is not set by the DHCP server.  Check also for a value of 0
  440          * to avoid panicking inappropriately in that situation.
  441          */
  442         if (nd->mygateway.sin_len != 0 &&
  443             nd->mygateway.sin_addr.s_addr != 0) {
  444                 struct sockaddr_in mask, sin;
  445 
  446                 bzero((caddr_t)&mask, sizeof(mask));
  447                 sin = mask;
  448                 sin.sin_family = AF_INET;
  449                 sin.sin_len = sizeof(sin);
  450                 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin,
  451                     (struct sockaddr *)&nd->mygateway,
  452                     (struct sockaddr *)&mask,
  453                     RTF_UP | RTF_GATEWAY, NULL);
  454                 if (error)
  455                         panic("nfs_mountroot: RTM_ADD: %d", error);
  456         }
  457 
  458         /*
  459          * Create the rootfs mount point.
  460          */
  461         nd->root_args.fh = nd->root_fh;
  462         nd->root_args.fhsize = nd->root_fhsize;
  463         l = ntohl(nd->root_saddr.sin_addr.s_addr);
  464         snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s",
  465                 (l >> 24) & 0xff, (l >> 16) & 0xff,
  466                 (l >>  8) & 0xff, (l >>  0) & 0xff, nd->root_hostnam);
  467         printf("NFS ROOT: %s\n", buf);
  468         if ((error = nfs_mountdiskless(buf, MNT_RDONLY,
  469             &nd->root_saddr, &nd->root_args, td, &vp, mp)) != 0) {
  470                 return (error);
  471         }
  472 
  473         /*
  474          * This is not really an nfs issue, but it is much easier to
  475          * set hostname here and then let the "/etc/rc.xxx" files
  476          * mount the right /var based upon its preset value.
  477          */
  478         bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN);
  479         hostname[MAXHOSTNAMELEN - 1] = '\0';
  480         for (i = 0; i < MAXHOSTNAMELEN; i++)
  481                 if (hostname[i] == '\0')
  482                         break;
  483         inittodr(ntohl(nd->root_time));
  484         return (0);
  485 }
  486 
  487 /*
  488  * Internal version of mount system call for diskless setup.
  489  */
  490 static int
  491 nfs_mountdiskless(char *path, int mountflag,
  492     struct sockaddr_in *sin, struct nfs_args *args, struct thread *td,
  493     struct vnode **vpp, struct mount *mp)
  494 {
  495         struct sockaddr *nam;
  496         int error;
  497 
  498         mp->mnt_kern_flag = 0;
  499         mp->mnt_flag = mountflag;
  500         nam = sodupsockaddr((struct sockaddr *)sin, M_WAITOK);
  501         if ((error = mountnfs(args, mp, nam, path, vpp,
  502             td->td_ucred)) != 0) {
  503                 printf("nfs_mountroot: mount %s on /: %d\n", path, error);
  504                 return (error);
  505         }
  506         return (0);
  507 }
  508 
  509 static void
  510 nfs_decode_args(struct mount *mp, struct nfsmount *nmp, struct nfs_args *argp)
  511 {
  512         int s;
  513         int adjsock;
  514         int maxio;
  515 
  516         s = splnet();
  517 
  518         /*
  519          * Set read-only flag if requested; otherwise, clear it if this is
  520          * an update.  If this is not an update, then either the read-only
  521          * flag is already clear, or this is a root mount and it was set
  522          * intentionally at some previous point.
  523          */
  524         if (vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL) == 0)
  525                 mp->mnt_flag |= MNT_RDONLY;
  526         else if (mp->mnt_flag & MNT_UPDATE)
  527                 mp->mnt_flag &= ~MNT_RDONLY;
  528 
  529         /*
  530          * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
  531          * no sense in that context.
  532          */
  533         if (argp->sotype == SOCK_STREAM)
  534                 nmp->nm_flag &= ~NFSMNT_NOCONN;
  535 
  536         /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */
  537         if ((argp->flags & NFSMNT_NFSV3) == 0)
  538                 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
  539 
  540         /* Re-bind if rsrvd port requested and wasn't on one */
  541         adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
  542                   && (argp->flags & NFSMNT_RESVPORT);
  543         /* Also re-bind if we're switching to/from a connected UDP socket */
  544         adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
  545                     (argp->flags & NFSMNT_NOCONN));
  546 
  547         /* Update flags atomically.  Don't change the lock bits. */
  548         nmp->nm_flag = argp->flags | nmp->nm_flag;
  549         splx(s);
  550 
  551         if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
  552                 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
  553                 if (nmp->nm_timeo < NFS_MINTIMEO)
  554                         nmp->nm_timeo = NFS_MINTIMEO;
  555                 else if (nmp->nm_timeo > NFS_MAXTIMEO)
  556                         nmp->nm_timeo = NFS_MAXTIMEO;
  557         }
  558 
  559         if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
  560                 nmp->nm_retry = argp->retrans;
  561                 if (nmp->nm_retry > NFS_MAXREXMIT)
  562                         nmp->nm_retry = NFS_MAXREXMIT;
  563         }
  564 
  565         if (argp->flags & NFSMNT_NFSV3) {
  566                 if (argp->sotype == SOCK_DGRAM)
  567                         maxio = NFS_MAXDGRAMDATA;
  568                 else
  569                         maxio = NFS_MAXDATA;
  570         } else
  571                 maxio = NFS_V2MAXDATA;
  572 
  573         if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
  574                 nmp->nm_wsize = argp->wsize;
  575                 /* Round down to multiple of blocksize */
  576                 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
  577                 if (nmp->nm_wsize <= 0)
  578                         nmp->nm_wsize = NFS_FABLKSIZE;
  579         }
  580         if (nmp->nm_wsize > maxio)
  581                 nmp->nm_wsize = maxio;
  582         if (nmp->nm_wsize > MAXBSIZE)
  583                 nmp->nm_wsize = MAXBSIZE;
  584 
  585         if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
  586                 nmp->nm_rsize = argp->rsize;
  587                 /* Round down to multiple of blocksize */
  588                 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
  589                 if (nmp->nm_rsize <= 0)
  590                         nmp->nm_rsize = NFS_FABLKSIZE;
  591         }
  592         if (nmp->nm_rsize > maxio)
  593                 nmp->nm_rsize = maxio;
  594         if (nmp->nm_rsize > MAXBSIZE)
  595                 nmp->nm_rsize = MAXBSIZE;
  596 
  597         if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
  598                 nmp->nm_readdirsize = argp->readdirsize;
  599         }
  600         if (nmp->nm_readdirsize > maxio)
  601                 nmp->nm_readdirsize = maxio;
  602         if (nmp->nm_readdirsize > nmp->nm_rsize)
  603                 nmp->nm_readdirsize = nmp->nm_rsize;
  604 
  605         if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0)
  606                 nmp->nm_acregmin = argp->acregmin;
  607         else
  608                 nmp->nm_acregmin = NFS_MINATTRTIMO;
  609         if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0)
  610                 nmp->nm_acregmax = argp->acregmax;
  611         else
  612                 nmp->nm_acregmax = NFS_MAXATTRTIMO;
  613         if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0)
  614                 nmp->nm_acdirmin = argp->acdirmin;
  615         else
  616                 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO;
  617         if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0)
  618                 nmp->nm_acdirmax = argp->acdirmax;
  619         else
  620                 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO;
  621         if (nmp->nm_acdirmin > nmp->nm_acdirmax)
  622                 nmp->nm_acdirmin = nmp->nm_acdirmax;
  623         if (nmp->nm_acregmin > nmp->nm_acregmax)
  624                 nmp->nm_acregmin = nmp->nm_acregmax;
  625 
  626         if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) {
  627                 if (argp->maxgrouplist <= NFS_MAXGRPS)
  628                         nmp->nm_numgrps = argp->maxgrouplist;
  629                 else
  630                         nmp->nm_numgrps = NFS_MAXGRPS;
  631         }
  632         if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) {
  633                 if (argp->readahead <= NFS_MAXRAHEAD)
  634                         nmp->nm_readahead = argp->readahead;
  635                 else
  636                         nmp->nm_readahead = NFS_MAXRAHEAD;
  637         }
  638         if ((argp->flags & NFSMNT_WCOMMITSIZE) && argp->wcommitsize >= 0) {
  639                 if (argp->wcommitsize < nmp->nm_wsize)
  640                         nmp->nm_wcommitsize = nmp->nm_wsize;
  641                 else
  642                         nmp->nm_wcommitsize = argp->wcommitsize;
  643         }
  644         if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 0) {
  645                 if (argp->deadthresh <= NFS_MAXDEADTHRESH)
  646                         nmp->nm_deadthresh = argp->deadthresh;
  647                 else
  648                         nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
  649         }
  650 
  651         adjsock |= ((nmp->nm_sotype != argp->sotype) ||
  652                     (nmp->nm_soproto != argp->proto));
  653         nmp->nm_sotype = argp->sotype;
  654         nmp->nm_soproto = argp->proto;
  655 
  656         if (nmp->nm_so && adjsock) {
  657                 nfs_safedisconnect(nmp);
  658                 if (nmp->nm_sotype == SOCK_DGRAM)
  659                         while (nfs_connect(nmp, NULL)) {
  660                                 printf("nfs_args: retrying connect\n");
  661                                 (void) tsleep((caddr_t)&lbolt,
  662                                               PSOCK, "nfscon", 0);
  663                         }
  664         }
  665 }
  666 
  667 static const char *nfs_opts[] = { "from", "nfs_args", NULL };
  668 
  669 /*
  670  * VFS Operations.
  671  *
  672  * mount system call
  673  * It seems a bit dumb to copyinstr() the host and path here and then
  674  * bcopy() them in mountnfs(), but I wanted to detect errors before
  675  * doing the sockargs() call because sockargs() allocates an mbuf and
  676  * an error after that means that I have to release the mbuf.
  677  */
  678 /* ARGSUSED */
  679 static int
  680 nfs_mount(struct mount *mp, struct thread *td)
  681 {
  682         int error;
  683         struct nfs_args args;
  684         struct sockaddr *nam;
  685         struct vnode *vp;
  686         char hst[MNAMELEN];
  687         size_t len;
  688         u_char nfh[NFSX_V3FHMAX];
  689 
  690         if (vfs_filteropt(mp->mnt_optnew, nfs_opts))
  691                 return (EINVAL);
  692 
  693         if (mp->mnt_flag & MNT_ROOTFS)
  694                 return (nfs_mountroot(mp, td));
  695 
  696         error = vfs_copyopt(mp->mnt_optnew, "nfs_args", &args, sizeof args);
  697         if (error)
  698                 return (error);
  699 
  700         if (args.version != NFS_ARGSVERSION) {
  701                 return (EPROGMISMATCH);
  702         }
  703         if (mp->mnt_flag & MNT_UPDATE) {
  704                 struct nfsmount *nmp = VFSTONFS(mp);
  705 
  706                 if (nmp == NULL)
  707                         return (EIO);
  708                 /*
  709                  * When doing an update, we can't change from or to
  710                  * v3, switch lockd strategies or change cookie translation
  711                  */
  712                 args.flags = (args.flags &
  713                     ~(NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/)) |
  714                     (nmp->nm_flag &
  715                         (NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/));
  716                 nfs_decode_args(mp, nmp, &args);
  717                 return (0);
  718         }
  719 
  720         /*
  721          * Make the nfs_ip_paranoia sysctl serve as the default connection
  722          * or no-connection mode for those protocols that support 
  723          * no-connection mode (the flag will be cleared later for protocols
  724          * that do not support no-connection mode).  This will allow a client
  725          * to receive replies from a different IP then the request was
  726          * sent to.  Note: default value for nfs_ip_paranoia is 1 (paranoid),
  727          * not 0.
  728          */
  729         if (nfs_ip_paranoia == 0)
  730                 args.flags |= NFSMNT_NOCONN;
  731         if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX)
  732                 return (EINVAL);
  733         error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
  734         if (error)
  735                 return (error);
  736         error = copyinstr(args.hostname, hst, MNAMELEN-1, &len);
  737         if (error)
  738                 return (error);
  739         bzero(&hst[len], MNAMELEN - len);
  740         /* sockargs() call must be after above copyin() calls */
  741         error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen);
  742         if (error)
  743                 return (error);
  744         args.fh = nfh;
  745         error = mountnfs(&args, mp, nam, hst, &vp, td->td_ucred);
  746         return (error);
  747 }
  748 
  749 
  750 /*
  751  * VFS Operations.
  752  *
  753  * mount system call
  754  * It seems a bit dumb to copyinstr() the host and path here and then
  755  * bcopy() them in mountnfs(), but I wanted to detect errors before
  756  * doing the sockargs() call because sockargs() allocates an mbuf and
  757  * an error after that means that I have to release the mbuf.
  758  */
  759 /* ARGSUSED */
  760 static int
  761 nfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td)
  762 {
  763         int error;
  764         struct nfs_args args;
  765 
  766         error = copyin(data, &args, sizeof (struct nfs_args));
  767         if (error)
  768                 return (error);
  769 
  770         ma = mount_arg(ma, "nfs_args", &args, sizeof args);
  771 
  772         error = kernel_mount(ma, flags);
  773 
  774         return (error);
  775 }
  776 
  777 /*
  778  * Common code for mount and mountroot
  779  */
  780 static int
  781 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam,
  782     char *hst, struct vnode **vpp, struct ucred *cred)
  783 {
  784         struct nfsmount *nmp;
  785         struct nfsnode *np;
  786         int error;
  787         struct vattr attrs;
  788 
  789         if (mp->mnt_flag & MNT_UPDATE) {
  790                 nmp = VFSTONFS(mp);
  791                 /* update paths, file handles, etc, here        XXX */
  792                 FREE(nam, M_SONAME);
  793                 return (0);
  794         } else {
  795                 nmp = uma_zalloc(nfsmount_zone, M_WAITOK);
  796                 bzero((caddr_t)nmp, sizeof (struct nfsmount));
  797                 TAILQ_INIT(&nmp->nm_bufq);
  798                 mp->mnt_data = (qaddr_t)nmp;
  799         }
  800         vfs_getnewfsid(mp);
  801         nmp->nm_mountp = mp;
  802 
  803         /*
  804          * V2 can only handle 32 bit filesizes.  A 4GB-1 limit may be too
  805          * high, depending on whether we end up with negative offsets in
  806          * the client or server somewhere.  2GB-1 may be safer.
  807          *
  808          * For V3, nfs_fsinfo will adjust this as necessary.  Assume maximum
  809          * that we can handle until we find out otherwise.
  810          * XXX Our "safe" limit on the client is what we can store in our
  811          * buffer cache using signed(!) block numbers.
  812          */
  813         if ((argp->flags & NFSMNT_NFSV3) == 0)
  814                 nmp->nm_maxfilesize = 0xffffffffLL;
  815         else
  816                 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
  817 
  818         nmp->nm_timeo = NFS_TIMEO;
  819         nmp->nm_retry = NFS_RETRANS;
  820         if ((argp->flags & NFSMNT_NFSV3) && argp->sotype == SOCK_STREAM) {
  821                 nmp->nm_wsize = nmp->nm_rsize = NFS_MAXDATA;
  822         } else {
  823                 nmp->nm_wsize = NFS_WSIZE;
  824                 nmp->nm_rsize = NFS_RSIZE;
  825         }
  826         nmp->nm_wcommitsize = hibufspace / (desiredvnodes / 1000);
  827         nmp->nm_readdirsize = NFS_READDIRSIZE;
  828         nmp->nm_numgrps = NFS_MAXGRPS;
  829         nmp->nm_readahead = NFS_DEFRAHEAD;
  830         nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
  831         nmp->nm_tprintf_delay = nfs_tprintf_delay;
  832         if (nmp->nm_tprintf_delay < 0)
  833                 nmp->nm_tprintf_delay = 0;
  834         nmp->nm_tprintf_initial_delay = nfs_tprintf_initial_delay;
  835         if (nmp->nm_tprintf_initial_delay < 0)
  836                 nmp->nm_tprintf_initial_delay = 0;
  837         nmp->nm_fhsize = argp->fhsize;
  838         bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize);
  839         bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
  840         nmp->nm_nam = nam;
  841         /* Set up the sockets and per-host congestion */
  842         nmp->nm_sotype = argp->sotype;
  843         nmp->nm_soproto = argp->proto;
  844         nmp->nm_rpcops = &nfs_rpcops;
  845 
  846         nfs_decode_args(mp, nmp, argp);
  847 
  848         if (nmp->nm_sotype == SOCK_STREAM)
  849                 mtx_init(&nmp->nm_nfstcpstate.mtx, "NFS/TCP state lock", 
  850                          NULL, MTX_DEF);                
  851 
  852         /*
  853          * For Connection based sockets (TCP,...) defer the connect until
  854          * the first request, in case the server is not responding.
  855          */
  856         if (nmp->nm_sotype == SOCK_DGRAM &&
  857                 (error = nfs_connect(nmp, NULL)))
  858                 goto bad;
  859 
  860         /*
  861          * This is silly, but it has to be set so that vinifod() works.
  862          * We do not want to do an nfs_statfs() here since we can get
  863          * stuck on a dead server and we are holding a lock on the mount
  864          * point.
  865          */
  866         mp->mnt_stat.f_iosize = nfs_iosize(nmp);
  867         /*
  868          * A reference count is needed on the nfsnode representing the
  869          * remote root.  If this object is not persistent, then backward
  870          * traversals of the mount point (i.e. "..") will not work if
  871          * the nfsnode gets flushed out of the cache. Ufs does not have
  872          * this problem, because one can identify root inodes by their
  873          * number == ROOTINO (2).
  874          */
  875         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
  876         if (error)
  877                 goto bad;
  878         *vpp = NFSTOV(np);
  879 
  880         /*
  881          * Get file attributes and transfer parameters for the
  882          * mountpoint.  This has the side effect of filling in
  883          * (*vpp)->v_type with the correct value.
  884          */
  885         if (argp->flags & NFSMNT_NFSV3)
  886                 nfs_fsinfo(nmp, *vpp, curthread->td_ucred, curthread);
  887         else
  888                 VOP_GETATTR(*vpp, &attrs, curthread->td_ucred, curthread);
  889 
  890         /*
  891          * Lose the lock but keep the ref.
  892          */
  893         VOP_UNLOCK(*vpp, 0, curthread);
  894 
  895         return (0);
  896 bad:
  897         if (nmp->nm_sotype == SOCK_STREAM)
  898                 mtx_destroy(&nmp->nm_nfstcpstate.mtx);
  899         nfs_disconnect(nmp);
  900         uma_zfree(nfsmount_zone, nmp);
  901         FREE(nam, M_SONAME);
  902         return (error);
  903 }
  904 
  905 /*
  906  * unmount system call
  907  */
  908 static int
  909 nfs_unmount(struct mount *mp, int mntflags, struct thread *td)
  910 {
  911         struct nfsmount *nmp;
  912         int error, flags = 0;
  913 
  914         if (mntflags & MNT_FORCE)
  915                 flags |= FORCECLOSE;
  916         nmp = VFSTONFS(mp);
  917         /*
  918          * Goes something like this..
  919          * - Call vflush() to clear out vnodes for this filesystem
  920          * - Close the socket
  921          * - Free up the data structures
  922          */
  923         /* In the forced case, cancel any outstanding requests. */
  924         if (flags & FORCECLOSE) {
  925                 error = nfs_nmcancelreqs(nmp);
  926                 if (error)
  927                         return (error);
  928         }
  929         /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */
  930         error = vflush(mp, 1, flags, td);
  931         if (error)
  932                 return (error);
  933 
  934         /*
  935          * We are now committed to the unmount.
  936          */
  937         nfs_disconnect(nmp);
  938         FREE(nmp->nm_nam, M_SONAME);
  939 
  940         if (nmp->nm_sotype == SOCK_STREAM)
  941                 mtx_destroy(&nmp->nm_nfstcpstate.mtx);
  942         
  943         uma_zfree(nfsmount_zone, nmp);
  944         return (0);
  945 }
  946 
  947 /*
  948  * Return root of a filesystem
  949  */
  950 static int
  951 nfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td)
  952 {
  953         struct vnode *vp;
  954         struct nfsmount *nmp;
  955         struct nfsnode *np;
  956         int error;
  957 
  958         nmp = VFSTONFS(mp);
  959         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
  960         if (error)
  961                 return (error);
  962         vp = NFSTOV(np);
  963         /*
  964          * Get transfer parameters and attributes for root vnode once.
  965          */
  966         if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0 &&
  967             (nmp->nm_flag & NFSMNT_NFSV3)) {
  968                 nfs_fsinfo(nmp, vp, curthread->td_ucred, curthread);
  969         }
  970         if (vp->v_type == VNON)
  971             vp->v_type = VDIR;
  972         vp->v_vflag |= VV_ROOT;
  973         *vpp = vp;
  974         return (0);
  975 }
  976 
  977 /*
  978  * Flush out the buffer cache
  979  */
  980 /* ARGSUSED */
  981 static int
  982 nfs_sync(struct mount *mp, int waitfor, struct thread *td)
  983 {
  984         struct vnode *vp, *nvp;
  985         int error, allerror = 0;
  986 
  987         /*
  988          * Force stale buffer cache information to be flushed.
  989          */
  990         MNT_ILOCK(mp);
  991 loop:
  992         MNT_VNODE_FOREACH(vp, mp, nvp) {
  993                 VI_LOCK(vp);
  994                 MNT_IUNLOCK(mp);
  995                 if (VOP_ISLOCKED(vp, NULL) ||
  996                     vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
  997                     waitfor == MNT_LAZY) {
  998                         VI_UNLOCK(vp);
  999                         MNT_ILOCK(mp);
 1000                         continue;
 1001                 }
 1002                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
 1003                         MNT_ILOCK(mp);
 1004                         goto loop;
 1005                 }
 1006                 error = VOP_FSYNC(vp, waitfor, td);
 1007                 if (error)
 1008                         allerror = error;
 1009                 VOP_UNLOCK(vp, 0, td);
 1010                 vrele(vp);
 1011 
 1012                 MNT_ILOCK(mp);
 1013         }
 1014         MNT_IUNLOCK(mp);
 1015         return (allerror);
 1016 }
 1017 
 1018 static int
 1019 nfs_sysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
 1020 {
 1021         struct nfsmount *nmp = VFSTONFS(mp);
 1022         struct vfsquery vq;
 1023         int error;
 1024 
 1025         bzero(&vq, sizeof(vq));
 1026         switch (op) {
 1027 #if 0
 1028         case VFS_CTL_NOLOCKS:
 1029                 val = (nmp->nm_flag & NFSMNT_NOLOCKS) ? 1 : 0;
 1030                 if (req->oldptr != NULL) {
 1031                         error = SYSCTL_OUT(req, &val, sizeof(val));
 1032                         if (error)
 1033                                 return (error);
 1034                 }
 1035                 if (req->newptr != NULL) {
 1036                         error = SYSCTL_IN(req, &val, sizeof(val));
 1037                         if (error)
 1038                                 return (error);
 1039                         if (val)
 1040                                 nmp->nm_flag |= NFSMNT_NOLOCKS;
 1041                         else
 1042                                 nmp->nm_flag &= ~NFSMNT_NOLOCKS;
 1043                 }
 1044                 break;
 1045 #endif
 1046         case VFS_CTL_QUERY:
 1047                 if (nmp->nm_state & NFSSTA_TIMEO)
 1048                         vq.vq_flags |= VQ_NOTRESP;
 1049 #if 0
 1050                 if (!(nmp->nm_flag & NFSMNT_NOLOCKS) &&
 1051                     (nmp->nm_state & NFSSTA_LOCKTIMEO))
 1052                         vq.vq_flags |= VQ_NOTRESPLOCK;
 1053 #endif
 1054                 error = SYSCTL_OUT(req, &vq, sizeof(vq));
 1055                 break;
 1056         case VFS_CTL_TIMEO:
 1057                 if (req->oldptr != NULL) {
 1058                         error = SYSCTL_OUT(req, &nmp->nm_tprintf_initial_delay,
 1059                             sizeof(nmp->nm_tprintf_initial_delay));
 1060                         if (error)
 1061                                 return (error);
 1062                 }
 1063                 if (req->newptr != NULL) {
 1064                         error = vfs_suser(mp, req->td);
 1065                         if (error)
 1066                                 return (error);
 1067                         error = SYSCTL_IN(req, &nmp->nm_tprintf_initial_delay,
 1068                             sizeof(nmp->nm_tprintf_initial_delay));
 1069                         if (error)
 1070                                 return (error);
 1071                         if (nmp->nm_tprintf_initial_delay < 0)
 1072                                 nmp->nm_tprintf_initial_delay = 0;
 1073                 }
 1074                 break;
 1075         default:
 1076                 return (ENOTSUP);
 1077         }
 1078         return (0);
 1079 }

Cache object: d3fbe592427ace3eb8fa00b241d83c00


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