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("$FreeBSD$");
   37 
   38 
   39 #include "opt_bootp.h"
   40 #include "opt_nfsroot.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/kernel.h>
   45 #include <sys/bio.h>
   46 #include <sys/buf.h>
   47 #include <sys/clock.h>
   48 #include <sys/lock.h>
   49 #include <sys/malloc.h>
   50 #include <sys/mbuf.h>
   51 #include <sys/module.h>
   52 #include <sys/mount.h>
   53 #include <sys/proc.h>
   54 #include <sys/socket.h>
   55 #include <sys/socketvar.h>
   56 #include <sys/sockio.h>
   57 #include <sys/sysctl.h>
   58 #include <sys/vnode.h>
   59 #include <sys/signalvar.h>
   60 
   61 #include <vm/vm.h>
   62 #include <vm/vm_extern.h>
   63 #include <vm/uma.h>
   64 
   65 #include <net/if.h>
   66 #include <net/route.h>
   67 #include <netinet/in.h>
   68 
   69 #include <rpc/rpcclnt.h>
   70 
   71 #include <nfs/rpcv2.h>
   72 #include <nfs/nfsproto.h>
   73 #include <nfsclient/nfs.h>
   74 #include <nfsclient/nfsnode.h>
   75 #include <nfsclient/nfsmount.h>
   76 #include <nfs/xdr_subs.h>
   77 #include <nfsclient/nfsm_subs.h>
   78 #include <nfsclient/nfsdiskless.h>
   79 
   80 MALLOC_DEFINE(M_NFSREQ, "nfsclient_req", "NFS request header");
   81 MALLOC_DEFINE(M_NFSBIGFH, "nfsclient_bigfh", "NFS version 3 file handle");
   82 MALLOC_DEFINE(M_NFSDIROFF, "nfsclient_diroff", "NFS directory offset data");
   83 MALLOC_DEFINE(M_NFSHASH, "nfsclient_hash", "NFS hash tables");
   84 MALLOC_DEFINE(M_NFSDIRECTIO, "nfsclient_directio", "NFS Direct IO async write state");
   85 
   86 uma_zone_t nfsmount_zone;
   87 
   88 struct nfsstats nfsstats;
   89 
   90 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem");
   91 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RW,
   92         &nfsstats, nfsstats, "S,nfsstats");
   93 static int nfs_ip_paranoia = 1;
   94 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW,
   95     &nfs_ip_paranoia, 0, "");
   96 #ifdef NFS_DEBUG
   97 int nfs_debug;
   98 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, "");
   99 #endif
  100 static int nfs_tprintf_initial_delay = NFS_TPRINTF_INITIAL_DELAY;
  101 SYSCTL_INT(_vfs_nfs, NFS_TPRINTF_INITIAL_DELAY,
  102         downdelayinitial, CTLFLAG_RW, &nfs_tprintf_initial_delay, 0, "");
  103 /* how long between console messages "nfs server foo not responding" */
  104 static int nfs_tprintf_delay = NFS_TPRINTF_DELAY;
  105 SYSCTL_INT(_vfs_nfs, NFS_TPRINTF_DELAY,
  106         downdelayinterval, CTLFLAG_RW, &nfs_tprintf_delay, 0, "");
  107 
  108 static void     nfs_decode_args(struct mount *mp, struct nfsmount *nmp,
  109                     struct nfs_args *argp, const char *hostname);
  110 static int      mountnfs(struct nfs_args *, struct mount *,
  111                     struct sockaddr *, char *, struct vnode **,
  112                     struct ucred *cred);
  113 static vfs_mount_t nfs_mount;
  114 static vfs_cmount_t nfs_cmount;
  115 static vfs_unmount_t nfs_unmount;
  116 static vfs_root_t nfs_root;
  117 static vfs_statfs_t nfs_statfs;
  118 static vfs_sync_t nfs_sync;
  119 static vfs_sysctl_t nfs_sysctl;
  120 
  121 /*
  122  * nfs vfs operations.
  123  */
  124 static struct vfsops nfs_vfsops = {
  125         .vfs_init =             nfs_init,
  126         .vfs_mount =            nfs_mount,
  127         .vfs_cmount =           nfs_cmount,
  128         .vfs_root =             nfs_root,
  129         .vfs_statfs =           nfs_statfs,
  130         .vfs_sync =             nfs_sync,
  131         .vfs_uninit =           nfs_uninit,
  132         .vfs_unmount =          nfs_unmount,
  133         .vfs_sysctl =           nfs_sysctl,
  134 };
  135 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK);
  136 
  137 /* So that loader and kldload(2) can find us, wherever we are.. */
  138 MODULE_VERSION(nfs, 1);
  139 
  140 static struct nfs_rpcops nfs_rpcops = {
  141         nfs_readrpc,
  142         nfs_writerpc,
  143         nfs_writebp,
  144         nfs_readlinkrpc,
  145         nfs_invaldir,
  146         nfs_commit,
  147 };
  148 
  149 /*
  150  * This structure must be filled in by a primary bootstrap or bootstrap
  151  * server for a diskless/dataless machine. It is initialized below just
  152  * to ensure that it is allocated to initialized data (.data not .bss).
  153  */
  154 struct nfs_diskless nfs_diskless = { { { 0 } } };
  155 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } };
  156 int nfs_diskless_valid = 0;
  157 
  158 SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD,
  159         &nfs_diskless_valid, 0, "");
  160 
  161 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD,
  162         nfsv3_diskless.root_hostnam, 0, "");
  163 
  164 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD,
  165         &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr,
  166         "%Ssockaddr_in", "");
  167 
  168 
  169 void            nfsargs_ntoh(struct nfs_args *);
  170 static int      nfs_mountdiskless(char *, int,
  171                     struct sockaddr_in *, struct nfs_args *,
  172                     struct thread *, struct vnode **, struct mount *);
  173 static void     nfs_convert_diskless(void);
  174 static void     nfs_convert_oargs(struct nfs_args *args,
  175                     struct onfs_args *oargs);
  176 
  177 int
  178 nfs_iosize(struct nfsmount *nmp)
  179 {
  180         int iosize;
  181 
  182         /*
  183          * Calculate the size used for io buffers.  Use the larger
  184          * of the two sizes to minimise nfs requests but make sure
  185          * that it is at least one VM page to avoid wasting buffer
  186          * space.
  187          */
  188         iosize = imax(nmp->nm_rsize, nmp->nm_wsize);
  189         iosize = imax(iosize, PAGE_SIZE);
  190         return (iosize);
  191 }
  192 
  193 static void
  194 nfs_convert_oargs(struct nfs_args *args, struct onfs_args *oargs)
  195 {
  196 
  197         args->version = NFS_ARGSVERSION;
  198         args->addr = oargs->addr;
  199         args->addrlen = oargs->addrlen;
  200         args->sotype = oargs->sotype;
  201         args->proto = oargs->proto;
  202         args->fh = oargs->fh;
  203         args->fhsize = oargs->fhsize;
  204         args->flags = oargs->flags;
  205         args->wsize = oargs->wsize;
  206         args->rsize = oargs->rsize;
  207         args->readdirsize = oargs->readdirsize;
  208         args->timeo = oargs->timeo;
  209         args->retrans = oargs->retrans;
  210         args->maxgrouplist = oargs->maxgrouplist;
  211         args->readahead = oargs->readahead;
  212         args->deadthresh = oargs->deadthresh;
  213         args->hostname = oargs->hostname;
  214 }
  215 
  216 static void
  217 nfs_convert_diskless(void)
  218 {
  219 
  220         bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif,
  221                 sizeof(struct ifaliasreq));
  222         bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway,
  223                 sizeof(struct sockaddr_in));
  224         nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args);
  225         if (nfsv3_diskless.root_args.flags & NFSMNT_NFSV3) {
  226                 nfsv3_diskless.root_fhsize = NFSX_V3FH;
  227                 bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V3FH);
  228         } else {
  229                 nfsv3_diskless.root_fhsize = NFSX_V2FH;
  230                 bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V2FH);
  231         }
  232         bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr,
  233                 sizeof(struct sockaddr_in));
  234         bcopy(nfs_diskless.root_hostnam, nfsv3_diskless.root_hostnam, MNAMELEN);
  235         nfsv3_diskless.root_time = nfs_diskless.root_time;
  236         bcopy(nfs_diskless.my_hostnam, nfsv3_diskless.my_hostnam,
  237                 MAXHOSTNAMELEN);
  238         nfs_diskless_valid = 3;
  239 }
  240 
  241 /*
  242  * nfs statfs call
  243  */
  244 static int
  245 nfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
  246 {
  247         struct vnode *vp;
  248         struct nfs_statfs *sfp;
  249         caddr_t bpos, dpos;
  250         struct nfsmount *nmp = VFSTONFS(mp);
  251         int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr;
  252         struct mbuf *mreq, *mrep, *md, *mb;
  253         struct nfsnode *np;
  254         u_quad_t tquad;
  255 
  256 #ifndef nolint
  257         sfp = NULL;
  258 #endif
  259         error = vfs_busy(mp, LK_NOWAIT, NULL, td);
  260         if (error)
  261                 return (error);
  262         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, LK_EXCLUSIVE);
  263         if (error) {
  264                 vfs_unbusy(mp, td);
  265                 return (error);
  266         }
  267         vp = NFSTOV(np);
  268         mtx_lock(&nmp->nm_mtx);
  269         if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
  270                 mtx_unlock(&nmp->nm_mtx);               
  271                 (void)nfs_fsinfo(nmp, vp, td->td_ucred, td);
  272         } else
  273                 mtx_unlock(&nmp->nm_mtx);
  274         nfsstats.rpccnt[NFSPROC_FSSTAT]++;
  275         mreq = nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3));
  276         mb = mreq;
  277         bpos = mtod(mb, caddr_t);
  278         nfsm_fhtom(vp, v3);
  279         nfsm_request(vp, NFSPROC_FSSTAT, td, td->td_ucred);
  280         if (v3)
  281                 nfsm_postop_attr(vp, retattr);
  282         if (error) {
  283                 if (mrep != NULL)
  284                         m_freem(mrep);
  285                 goto nfsmout;
  286         }
  287         sfp = nfsm_dissect(struct nfs_statfs *, NFSX_STATFS(v3));
  288         mtx_lock(&nmp->nm_mtx);
  289         sbp->f_iosize = nfs_iosize(nmp);
  290         mtx_unlock(&nmp->nm_mtx);
  291         if (v3) {
  292                 sbp->f_bsize = NFS_FABLKSIZE;
  293                 tquad = fxdr_hyper(&sfp->sf_tbytes);
  294                 sbp->f_blocks = tquad / NFS_FABLKSIZE;
  295                 tquad = fxdr_hyper(&sfp->sf_fbytes);
  296                 sbp->f_bfree = tquad / NFS_FABLKSIZE;
  297                 tquad = fxdr_hyper(&sfp->sf_abytes);
  298                 sbp->f_bavail = tquad / NFS_FABLKSIZE;
  299                 sbp->f_files = (fxdr_unsigned(int32_t,
  300                     sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff);
  301                 sbp->f_ffree = (fxdr_unsigned(int32_t,
  302                     sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff);
  303         } else {
  304                 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
  305                 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
  306                 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
  307                 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
  308                 sbp->f_files = 0;
  309                 sbp->f_ffree = 0;
  310         }
  311         m_freem(mrep);
  312 nfsmout:
  313         vput(vp);
  314         vfs_unbusy(mp, td);
  315         return (error);
  316 }
  317 
  318 /*
  319  * nfs version 3 fsinfo rpc call
  320  */
  321 int
  322 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct ucred *cred,
  323     struct thread *td)
  324 {
  325         struct nfsv3_fsinfo *fsp;
  326         u_int32_t pref, max;
  327         caddr_t bpos, dpos;
  328         int error = 0, retattr;
  329         struct mbuf *mreq, *mrep, *md, *mb;
  330         u_int64_t maxfsize;
  331         
  332         nfsstats.rpccnt[NFSPROC_FSINFO]++;
  333         mreq = nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1));
  334         mb = mreq;
  335         bpos = mtod(mb, caddr_t);
  336         nfsm_fhtom(vp, 1);
  337         nfsm_request(vp, NFSPROC_FSINFO, td, cred);
  338         nfsm_postop_attr(vp, retattr);
  339         if (!error) {
  340                 fsp = nfsm_dissect(struct nfsv3_fsinfo *, NFSX_V3FSINFO);
  341                 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
  342                 mtx_lock(&nmp->nm_mtx);
  343                 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
  344                         nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
  345                                 ~(NFS_FABLKSIZE - 1);
  346                 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
  347                 if (max < nmp->nm_wsize && max > 0) {
  348                         nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
  349                         if (nmp->nm_wsize == 0)
  350                                 nmp->nm_wsize = max;
  351                 }
  352                 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
  353                 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
  354                         nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
  355                                 ~(NFS_FABLKSIZE - 1);
  356                 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
  357                 if (max < nmp->nm_rsize && max > 0) {
  358                         nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
  359                         if (nmp->nm_rsize == 0)
  360                                 nmp->nm_rsize = max;
  361                 }
  362                 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
  363                 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ)
  364                         nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) &
  365                                 ~(NFS_DIRBLKSIZ - 1);
  366                 if (max < nmp->nm_readdirsize && max > 0) {
  367                         nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1);
  368                         if (nmp->nm_readdirsize == 0)
  369                                 nmp->nm_readdirsize = max;
  370                 }
  371                 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
  372                 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
  373                         nmp->nm_maxfilesize = maxfsize;
  374                 nmp->nm_mountp->mnt_stat.f_iosize = nfs_iosize(nmp);
  375                 nmp->nm_state |= NFSSTA_GOTFSINFO;
  376                 mtx_unlock(&nmp->nm_mtx);
  377         }
  378         m_freem(mrep);
  379 nfsmout:
  380         return (error);
  381 }
  382 
  383 /*
  384  * Mount a remote root fs via. nfs. This depends on the info in the
  385  * nfs_diskless structure that has been filled in properly by some primary
  386  * bootstrap.
  387  * It goes something like this:
  388  * - do enough of "ifconfig" by calling ifioctl() so that the system
  389  *   can talk to the server
  390  * - If nfs_diskless.mygateway is filled in, use that address as
  391  *   a default gateway.
  392  * - build the rootfs mount point and call mountnfs() to do the rest.
  393  *
  394  * It is assumed to be safe to read, modify, and write the nfsv3_diskless
  395  * structure, as well as other global NFS client variables here, as
  396  * nfs_mountroot() will be called once in the boot before any other NFS
  397  * client activity occurs.
  398  */
  399 int
  400 nfs_mountroot(struct mount *mp, struct thread *td)
  401 {
  402         struct nfsv3_diskless *nd = &nfsv3_diskless;
  403         struct socket *so;
  404         struct vnode *vp;
  405         struct ifreq ir;
  406         int error, i;
  407         u_long l;
  408         char buf[128];
  409         char *cp;
  410 
  411 #if defined(BOOTP_NFSROOT) && defined(BOOTP)
  412         bootpc_init();          /* use bootp to get nfs_diskless filled in */
  413 #elif defined(NFS_ROOT)
  414         nfs_setup_diskless();
  415 #endif
  416 
  417         if (nfs_diskless_valid == 0)
  418                 return (-1);
  419         if (nfs_diskless_valid == 1)
  420                 nfs_convert_diskless();
  421 
  422         /*
  423          * XXX splnet, so networks will receive...
  424          */
  425         splnet();
  426 
  427         /*
  428          * Do enough of ifconfig(8) so that the critical net interface can
  429          * talk to the server.
  430          */
  431         error = socreate(nd->myif.ifra_addr.sa_family, &so, nd->root_args.sotype, 0,
  432             td->td_ucred, td);
  433         if (error)
  434                 panic("nfs_mountroot: socreate(%04x): %d",
  435                         nd->myif.ifra_addr.sa_family, error);
  436 
  437 #if 0 /* XXX Bad idea */
  438         /*
  439          * We might not have been told the right interface, so we pass
  440          * over the first ten interfaces of the same kind, until we get
  441          * one of them configured.
  442          */
  443 
  444         for (i = strlen(nd->myif.ifra_name) - 1;
  445                 nd->myif.ifra_name[i] >= '' &&
  446                 nd->myif.ifra_name[i] <= '9';
  447                 nd->myif.ifra_name[i] ++) {
  448                 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
  449                 if(!error)
  450                         break;
  451         }
  452 #endif
  453         error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
  454         if (error)
  455                 panic("nfs_mountroot: SIOCAIFADDR: %d", error);
  456         if ((cp = getenv("boot.netif.mtu")) != NULL) {
  457                 ir.ifr_mtu = strtol(cp, NULL, 10);
  458                 bcopy(nd->myif.ifra_name, ir.ifr_name, IFNAMSIZ);
  459                 freeenv(cp);
  460                 error = ifioctl(so, SIOCSIFMTU, (caddr_t)&ir, td);
  461                 if (error)
  462                         printf("nfs_mountroot: SIOCSIFMTU: %d", error);
  463         }
  464         soclose(so);
  465 
  466         /*
  467          * If the gateway field is filled in, set it as the default route.
  468          * Note that pxeboot will set a default route of 0 if the route
  469          * is not set by the DHCP server.  Check also for a value of 0
  470          * to avoid panicking inappropriately in that situation.
  471          */
  472         if (nd->mygateway.sin_len != 0 &&
  473             nd->mygateway.sin_addr.s_addr != 0) {
  474                 struct sockaddr_in mask, sin;
  475 
  476                 bzero((caddr_t)&mask, sizeof(mask));
  477                 sin = mask;
  478                 sin.sin_family = AF_INET;
  479                 sin.sin_len = sizeof(sin);
  480                 /* XXX MRT use table 0 for this sort of thing */
  481                 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin,
  482                     (struct sockaddr *)&nd->mygateway,
  483                     (struct sockaddr *)&mask,
  484                     RTF_UP | RTF_GATEWAY, NULL);
  485                 if (error)
  486                         panic("nfs_mountroot: RTM_ADD: %d", error);
  487         }
  488 
  489         /*
  490          * Create the rootfs mount point.
  491          */
  492         nd->root_args.fh = nd->root_fh;
  493         nd->root_args.fhsize = nd->root_fhsize;
  494         l = ntohl(nd->root_saddr.sin_addr.s_addr);
  495         snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s",
  496                 (l >> 24) & 0xff, (l >> 16) & 0xff,
  497                 (l >>  8) & 0xff, (l >>  0) & 0xff, nd->root_hostnam);
  498         printf("NFS ROOT: %s\n", buf);
  499         nd->root_args.hostname = buf;
  500         if ((error = nfs_mountdiskless(buf, MNT_RDONLY,
  501             &nd->root_saddr, &nd->root_args, td, &vp, mp)) != 0) {
  502                 return (error);
  503         }
  504 
  505         /*
  506          * This is not really an nfs issue, but it is much easier to
  507          * set hostname here and then let the "/etc/rc.xxx" files
  508          * mount the right /var based upon its preset value.
  509          */
  510         bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN);
  511         hostname[MAXHOSTNAMELEN - 1] = '\0';
  512         for (i = 0; i < MAXHOSTNAMELEN; i++)
  513                 if (hostname[i] == '\0')
  514                         break;
  515         inittodr(ntohl(nd->root_time));
  516         return (0);
  517 }
  518 
  519 /*
  520  * Internal version of mount system call for diskless setup.
  521  */
  522 static int
  523 nfs_mountdiskless(char *path, int mountflag,
  524     struct sockaddr_in *sin, struct nfs_args *args, struct thread *td,
  525     struct vnode **vpp, struct mount *mp)
  526 {
  527         struct sockaddr *nam;
  528         int error;
  529 
  530         MNT_ILOCK(mp);
  531         mp->mnt_kern_flag = 0;
  532         mp->mnt_flag = mountflag;
  533         MNT_IUNLOCK(mp);
  534         nam = sodupsockaddr((struct sockaddr *)sin, M_WAITOK);
  535         if ((error = mountnfs(args, mp, nam, path, vpp,
  536             td->td_ucred)) != 0) {
  537                 printf("nfs_mountroot: mount %s on /: %d\n", path, error);
  538                 return (error);
  539         }
  540         return (0);
  541 }
  542 
  543 static void
  544 nfs_decode_args(struct mount *mp, struct nfsmount *nmp, struct nfs_args *argp,
  545         const char *hostname)
  546 {
  547         int s;
  548         int adjsock;
  549         int maxio;
  550         char *p;
  551 
  552         s = splnet();
  553 
  554         /*
  555          * Set read-only flag if requested; otherwise, clear it if this is
  556          * an update.  If this is not an update, then either the read-only
  557          * flag is already clear, or this is a root mount and it was set
  558          * intentionally at some previous point.
  559          */
  560         if (vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL) == 0) {
  561                 MNT_ILOCK(mp);
  562                 mp->mnt_flag |= MNT_RDONLY;
  563                 MNT_IUNLOCK(mp);
  564         } else if (mp->mnt_flag & MNT_UPDATE) {
  565                 MNT_ILOCK(mp);
  566                 mp->mnt_flag &= ~MNT_RDONLY;
  567                 MNT_IUNLOCK(mp);
  568         }
  569 
  570         /*
  571          * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
  572          * no sense in that context.  Also, set up appropriate retransmit
  573          * and soft timeout behavior.
  574          */
  575         if (argp->sotype == SOCK_STREAM) {
  576                 nmp->nm_flag &= ~NFSMNT_NOCONN;
  577                 nmp->nm_flag |= NFSMNT_DUMBTIMR;
  578                 nmp->nm_timeo = NFS_MAXTIMEO;
  579                 nmp->nm_retry = NFS_RETRANS_TCP;
  580         }
  581 
  582         /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */
  583         if ((argp->flags & NFSMNT_NFSV3) == 0)
  584                 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
  585 
  586         /* Re-bind if rsrvd port requested and wasn't on one */
  587         adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
  588                   && (argp->flags & NFSMNT_RESVPORT);
  589         /* Also re-bind if we're switching to/from a connected UDP socket */
  590         adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
  591                     (argp->flags & NFSMNT_NOCONN));
  592 
  593         /* Update flags atomically.  Don't change the lock bits. */
  594         nmp->nm_flag = argp->flags | nmp->nm_flag;
  595         splx(s);
  596 
  597         if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
  598                 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
  599                 if (nmp->nm_timeo < NFS_MINTIMEO)
  600                         nmp->nm_timeo = NFS_MINTIMEO;
  601                 else if (nmp->nm_timeo > NFS_MAXTIMEO)
  602                         nmp->nm_timeo = NFS_MAXTIMEO;
  603         }
  604 
  605         if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
  606                 nmp->nm_retry = argp->retrans;
  607                 if (nmp->nm_retry > NFS_MAXREXMIT)
  608                         nmp->nm_retry = NFS_MAXREXMIT;
  609         }
  610 
  611         if (argp->flags & NFSMNT_NFSV3) {
  612                 if (argp->sotype == SOCK_DGRAM)
  613                         maxio = NFS_MAXDGRAMDATA;
  614                 else
  615                         maxio = NFS_MAXDATA;
  616         } else
  617                 maxio = NFS_V2MAXDATA;
  618 
  619         if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
  620                 nmp->nm_wsize = argp->wsize;
  621                 /* Round down to multiple of blocksize */
  622                 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
  623                 if (nmp->nm_wsize <= 0)
  624                         nmp->nm_wsize = NFS_FABLKSIZE;
  625         }
  626         if (nmp->nm_wsize > maxio)
  627                 nmp->nm_wsize = maxio;
  628         if (nmp->nm_wsize > MAXBSIZE)
  629                 nmp->nm_wsize = MAXBSIZE;
  630 
  631         if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
  632                 nmp->nm_rsize = argp->rsize;
  633                 /* Round down to multiple of blocksize */
  634                 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
  635                 if (nmp->nm_rsize <= 0)
  636                         nmp->nm_rsize = NFS_FABLKSIZE;
  637         }
  638         if (nmp->nm_rsize > maxio)
  639                 nmp->nm_rsize = maxio;
  640         if (nmp->nm_rsize > MAXBSIZE)
  641                 nmp->nm_rsize = MAXBSIZE;
  642 
  643         if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
  644                 nmp->nm_readdirsize = argp->readdirsize;
  645         }
  646         if (nmp->nm_readdirsize > maxio)
  647                 nmp->nm_readdirsize = maxio;
  648         if (nmp->nm_readdirsize > nmp->nm_rsize)
  649                 nmp->nm_readdirsize = nmp->nm_rsize;
  650 
  651         if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0)
  652                 nmp->nm_acregmin = argp->acregmin;
  653         else
  654                 nmp->nm_acregmin = NFS_MINATTRTIMO;
  655         if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0)
  656                 nmp->nm_acregmax = argp->acregmax;
  657         else
  658                 nmp->nm_acregmax = NFS_MAXATTRTIMO;
  659         if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0)
  660                 nmp->nm_acdirmin = argp->acdirmin;
  661         else
  662                 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO;
  663         if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0)
  664                 nmp->nm_acdirmax = argp->acdirmax;
  665         else
  666                 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO;
  667         if (nmp->nm_acdirmin > nmp->nm_acdirmax)
  668                 nmp->nm_acdirmin = nmp->nm_acdirmax;
  669         if (nmp->nm_acregmin > nmp->nm_acregmax)
  670                 nmp->nm_acregmin = nmp->nm_acregmax;
  671 
  672         if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) {
  673                 if (argp->maxgrouplist <= NFS_MAXGRPS)
  674                         nmp->nm_numgrps = argp->maxgrouplist;
  675                 else
  676                         nmp->nm_numgrps = NFS_MAXGRPS;
  677         }
  678         if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) {
  679                 if (argp->readahead <= NFS_MAXRAHEAD)
  680                         nmp->nm_readahead = argp->readahead;
  681                 else
  682                         nmp->nm_readahead = NFS_MAXRAHEAD;
  683         }
  684         if ((argp->flags & NFSMNT_WCOMMITSIZE) && argp->wcommitsize >= 0) {
  685                 if (argp->wcommitsize < nmp->nm_wsize)
  686                         nmp->nm_wcommitsize = nmp->nm_wsize;
  687                 else
  688                         nmp->nm_wcommitsize = argp->wcommitsize;
  689         }
  690         if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 0) {
  691                 if (argp->deadthresh <= NFS_MAXDEADTHRESH)
  692                         nmp->nm_deadthresh = argp->deadthresh;
  693                 else
  694                         nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
  695         }
  696 
  697         adjsock |= ((nmp->nm_sotype != argp->sotype) ||
  698                     (nmp->nm_soproto != argp->proto));
  699         nmp->nm_sotype = argp->sotype;
  700         nmp->nm_soproto = argp->proto;
  701 
  702         if (nmp->nm_so && adjsock) {
  703                 nfs_safedisconnect(nmp);
  704                 if (nmp->nm_sotype == SOCK_DGRAM)
  705                         while (nfs_connect(nmp, NULL)) {
  706                                 printf("nfs_args: retrying connect\n");
  707                                 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0);
  708                         }
  709         }
  710 
  711         if (hostname) {
  712                 strlcpy(nmp->nm_hostname, hostname,
  713                     sizeof(nmp->nm_hostname));
  714                 p = strchr(nmp->nm_hostname, ':');
  715                 if (p)
  716                         *p = '\0';
  717         }
  718 }
  719 
  720 static const char *nfs_opts[] = { "from", "nfs_args", NULL };
  721 
  722 /*
  723  * VFS Operations.
  724  *
  725  * mount system call
  726  * It seems a bit dumb to copyinstr() the host and path here and then
  727  * bcopy() them in mountnfs(), but I wanted to detect errors before
  728  * doing the sockargs() call because sockargs() allocates an mbuf and
  729  * an error after that means that I have to release the mbuf.
  730  */
  731 /* ARGSUSED */
  732 static int
  733 nfs_mount(struct mount *mp, struct thread *td)
  734 {
  735         int error;
  736         struct nfs_args args;
  737         struct sockaddr *nam;
  738         struct vnode *vp;
  739         char hst[MNAMELEN];
  740         size_t len;
  741         u_char nfh[NFSX_V3FHMAX];
  742 
  743         if (vfs_filteropt(mp->mnt_optnew, nfs_opts)) {
  744                 error = EINVAL;
  745                 goto out;
  746         }
  747 
  748         if (mp->mnt_flag & MNT_ROOTFS) {
  749                 error = nfs_mountroot(mp, td);
  750                 goto out;
  751         }
  752 
  753         error = vfs_copyopt(mp->mnt_optnew, "nfs_args", &args, sizeof args);
  754         if (error)
  755                 goto out;
  756 
  757         if (args.version != NFS_ARGSVERSION) {
  758                 error = EPROGMISMATCH;
  759                 goto out;
  760         }
  761         if (mp->mnt_flag & MNT_UPDATE) {
  762                 struct nfsmount *nmp = VFSTONFS(mp);
  763 
  764                 if (nmp == NULL) {
  765                         error = EIO;
  766                         goto out;
  767                 }
  768                 /*
  769                  * When doing an update, we can't change from or to
  770                  * v3, switch lockd strategies or change cookie translation
  771                  */
  772                 args.flags = (args.flags &
  773                     ~(NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/)) |
  774                     (nmp->nm_flag &
  775                         (NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/));
  776                 nfs_decode_args(mp, nmp, &args, NULL);
  777                 goto out;
  778         }
  779 
  780         /*
  781          * Make the nfs_ip_paranoia sysctl serve as the default connection
  782          * or no-connection mode for those protocols that support 
  783          * no-connection mode (the flag will be cleared later for protocols
  784          * that do not support no-connection mode).  This will allow a client
  785          * to receive replies from a different IP then the request was
  786          * sent to.  Note: default value for nfs_ip_paranoia is 1 (paranoid),
  787          * not 0.
  788          */
  789         if (nfs_ip_paranoia == 0)
  790                 args.flags |= NFSMNT_NOCONN;
  791         if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) {
  792                 error = EINVAL;
  793                 goto out;
  794         }
  795         error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
  796         if (error)
  797                 goto out;
  798         error = copyinstr(args.hostname, hst, MNAMELEN-1, &len);
  799         if (error)
  800                 goto out;
  801         bzero(&hst[len], MNAMELEN - len);
  802         /* sockargs() call must be after above copyin() calls */
  803         error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen);
  804         if (error)
  805                 goto out;
  806         args.fh = nfh;
  807         error = mountnfs(&args, mp, nam, hst, &vp, td->td_ucred);
  808 out:
  809         if (!error) {
  810                 MNT_ILOCK(mp);
  811                 mp->mnt_kern_flag |= (MNTK_MPSAFE|MNTK_LOOKUP_SHARED);
  812                 MNT_IUNLOCK(mp);
  813         }
  814         return (error);
  815 }
  816 
  817 
  818 /*
  819  * VFS Operations.
  820  *
  821  * mount system call
  822  * It seems a bit dumb to copyinstr() the host and path here and then
  823  * bcopy() them in mountnfs(), but I wanted to detect errors before
  824  * doing the sockargs() call because sockargs() allocates an mbuf and
  825  * an error after that means that I have to release the mbuf.
  826  */
  827 /* ARGSUSED */
  828 static int
  829 nfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td)
  830 {
  831         int error;
  832         struct nfs_args args;
  833 
  834         error = copyin(data, &args, sizeof (struct nfs_args));
  835         if (error)
  836                 return error;
  837 
  838         ma = mount_arg(ma, "nfs_args", &args, sizeof args);
  839 
  840         error = kernel_mount(ma, flags);
  841         return (error);
  842 }
  843 
  844 /*
  845  * Common code for mount and mountroot
  846  */
  847 static int
  848 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam,
  849     char *hst, struct vnode **vpp, struct ucred *cred)
  850 {
  851         struct nfsmount *nmp;
  852         struct nfsnode *np;
  853         int error;
  854         struct vattr attrs;
  855 
  856         if (mp->mnt_flag & MNT_UPDATE) {
  857                 nmp = VFSTONFS(mp);
  858                 /* update paths, file handles, etc, here        XXX */
  859                 FREE(nam, M_SONAME);
  860                 return (0);
  861         } else {
  862                 nmp = uma_zalloc(nfsmount_zone, M_WAITOK);
  863                 bzero((caddr_t)nmp, sizeof (struct nfsmount));
  864                 TAILQ_INIT(&nmp->nm_bufq);
  865                 mp->mnt_data = (qaddr_t)nmp;
  866         }
  867         vfs_getnewfsid(mp);
  868         nmp->nm_mountp = mp;
  869         mtx_init(&nmp->nm_mtx, "NFSmount lock", NULL, MTX_DEF);                 
  870 
  871         /*
  872          * V2 can only handle 32 bit filesizes.  A 4GB-1 limit may be too
  873          * high, depending on whether we end up with negative offsets in
  874          * the client or server somewhere.  2GB-1 may be safer.
  875          *
  876          * For V3, nfs_fsinfo will adjust this as necessary.  Assume maximum
  877          * that we can handle until we find out otherwise.
  878          * XXX Our "safe" limit on the client is what we can store in our
  879          * buffer cache using signed(!) block numbers.
  880          */
  881         if ((argp->flags & NFSMNT_NFSV3) == 0)
  882                 nmp->nm_maxfilesize = 0xffffffffLL;
  883         else
  884                 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
  885 
  886         nmp->nm_timeo = NFS_TIMEO;
  887         nmp->nm_retry = NFS_RETRANS;
  888         if ((argp->flags & NFSMNT_NFSV3) && argp->sotype == SOCK_STREAM) {
  889                 nmp->nm_wsize = nmp->nm_rsize = NFS_MAXDATA;
  890         } else {
  891                 nmp->nm_wsize = NFS_WSIZE;
  892                 nmp->nm_rsize = NFS_RSIZE;
  893         }
  894         nmp->nm_wcommitsize = hibufspace / (desiredvnodes / 1000);
  895         nmp->nm_readdirsize = NFS_READDIRSIZE;
  896         nmp->nm_numgrps = NFS_MAXGRPS;
  897         nmp->nm_readahead = NFS_DEFRAHEAD;
  898         nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
  899         nmp->nm_tprintf_delay = nfs_tprintf_delay;
  900         if (nmp->nm_tprintf_delay < 0)
  901                 nmp->nm_tprintf_delay = 0;
  902         nmp->nm_tprintf_initial_delay = nfs_tprintf_initial_delay;
  903         if (nmp->nm_tprintf_initial_delay < 0)
  904                 nmp->nm_tprintf_initial_delay = 0;
  905         nmp->nm_fhsize = argp->fhsize;
  906         bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize);
  907         bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
  908         nmp->nm_nam = nam;
  909         /* Set up the sockets and per-host congestion */
  910         nmp->nm_sotype = argp->sotype;
  911         nmp->nm_soproto = argp->proto;
  912         nmp->nm_rpcops = &nfs_rpcops;
  913 
  914         nfs_decode_args(mp, nmp, argp, hst);
  915 
  916         /*
  917          * For Connection based sockets (TCP,...) defer the connect until
  918          * the first request, in case the server is not responding.
  919          */
  920         if (nmp->nm_sotype == SOCK_DGRAM &&
  921                 (error = nfs_connect(nmp, NULL)))
  922                 goto bad;
  923 
  924         /*
  925          * This is silly, but it has to be set so that vinifod() works.
  926          * We do not want to do an nfs_statfs() here since we can get
  927          * stuck on a dead server and we are holding a lock on the mount
  928          * point.
  929          */
  930         mtx_lock(&nmp->nm_mtx);
  931         mp->mnt_stat.f_iosize = nfs_iosize(nmp);
  932         mtx_unlock(&nmp->nm_mtx);
  933         /*
  934          * A reference count is needed on the nfsnode representing the
  935          * remote root.  If this object is not persistent, then backward
  936          * traversals of the mount point (i.e. "..") will not work if
  937          * the nfsnode gets flushed out of the cache. Ufs does not have
  938          * this problem, because one can identify root inodes by their
  939          * number == ROOTINO (2).
  940          */
  941         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, LK_EXCLUSIVE);
  942         if (error)
  943                 goto bad;
  944         *vpp = NFSTOV(np);
  945 
  946         /*
  947          * Get file attributes and transfer parameters for the
  948          * mountpoint.  This has the side effect of filling in
  949          * (*vpp)->v_type with the correct value.
  950          */
  951         if (argp->flags & NFSMNT_NFSV3)
  952                 nfs_fsinfo(nmp, *vpp, curthread->td_ucred, curthread);
  953         else
  954                 VOP_GETATTR(*vpp, &attrs, curthread->td_ucred, curthread);
  955 
  956         /*
  957          * Lose the lock but keep the ref.
  958          */
  959         VOP_UNLOCK(*vpp, 0, curthread);
  960 
  961         return (0);
  962 bad:
  963         nfs_disconnect(nmp);
  964         mtx_destroy(&nmp->nm_mtx);
  965         uma_zfree(nfsmount_zone, nmp);
  966         FREE(nam, M_SONAME);
  967         return (error);
  968 }
  969 
  970 /*
  971  * unmount system call
  972  */
  973 static int
  974 nfs_unmount(struct mount *mp, int mntflags, struct thread *td)
  975 {
  976         struct nfsmount *nmp;
  977         int error, flags = 0;
  978 
  979         if (mntflags & MNT_FORCE)
  980                 flags |= FORCECLOSE;
  981         nmp = VFSTONFS(mp);
  982         /*
  983          * Goes something like this..
  984          * - Call vflush() to clear out vnodes for this filesystem
  985          * - Close the socket
  986          * - Free up the data structures
  987          */
  988         /* In the forced case, cancel any outstanding requests. */
  989         if (flags & FORCECLOSE) {
  990                 error = nfs_nmcancelreqs(nmp);
  991                 if (error)
  992                         goto out;
  993         }
  994         /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */
  995         error = vflush(mp, 1, flags, td);
  996         if (error)
  997                 goto out;
  998 
  999         /*
 1000          * We are now committed to the unmount.
 1001          */
 1002         nfs_disconnect(nmp);
 1003         FREE(nmp->nm_nam, M_SONAME);
 1004 
 1005         mtx_destroy(&nmp->nm_mtx);
 1006         uma_zfree(nfsmount_zone, nmp);
 1007 out:
 1008         return (error);
 1009 }
 1010 
 1011 /*
 1012  * Return root of a filesystem
 1013  */
 1014 static int
 1015 nfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td)
 1016 {
 1017         struct vnode *vp;
 1018         struct nfsmount *nmp;
 1019         struct nfsnode *np;
 1020         int error;
 1021 
 1022         nmp = VFSTONFS(mp);
 1023         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, flags);
 1024         if (error)
 1025                 return error;
 1026         vp = NFSTOV(np);
 1027         /*
 1028          * Get transfer parameters and attributes for root vnode once.
 1029          */
 1030         mtx_lock(&nmp->nm_mtx);
 1031         if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0 &&
 1032             (nmp->nm_flag & NFSMNT_NFSV3)) {
 1033                 mtx_unlock(&nmp->nm_mtx);
 1034                 nfs_fsinfo(nmp, vp, curthread->td_ucred, curthread);
 1035         } else 
 1036                 mtx_unlock(&nmp->nm_mtx);
 1037         if (vp->v_type == VNON)
 1038             vp->v_type = VDIR;
 1039         vp->v_vflag |= VV_ROOT;
 1040         *vpp = vp;
 1041         return (0);
 1042 }
 1043 
 1044 /*
 1045  * Flush out the buffer cache
 1046  */
 1047 /* ARGSUSED */
 1048 static int
 1049 nfs_sync(struct mount *mp, int waitfor, struct thread *td)
 1050 {
 1051         struct vnode *vp, *mvp;
 1052         int error, allerror = 0;
 1053 
 1054         /*
 1055          * Force stale buffer cache information to be flushed.
 1056          */
 1057         MNT_ILOCK(mp);
 1058 loop:
 1059         MNT_VNODE_FOREACH(vp, mp, mvp) {
 1060                 VI_LOCK(vp);
 1061                 MNT_IUNLOCK(mp);
 1062                 if (VOP_ISLOCKED(vp, NULL) ||
 1063                     vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
 1064                     waitfor == MNT_LAZY) {
 1065                         VI_UNLOCK(vp);
 1066                         MNT_ILOCK(mp);
 1067                         continue;
 1068                 }
 1069                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
 1070                         MNT_ILOCK(mp);
 1071                         MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp);
 1072                         goto loop;
 1073                 }
 1074                 error = VOP_FSYNC(vp, waitfor, td);
 1075                 if (error)
 1076                         allerror = error;
 1077                 VOP_UNLOCK(vp, 0, td);
 1078                 vrele(vp);
 1079 
 1080                 MNT_ILOCK(mp);
 1081         }
 1082         MNT_IUNLOCK(mp);
 1083         return (allerror);
 1084 }
 1085 
 1086 static int
 1087 nfs_sysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
 1088 {
 1089         struct nfsmount *nmp = VFSTONFS(mp);
 1090         struct vfsquery vq;
 1091         int error;
 1092 
 1093         bzero(&vq, sizeof(vq));
 1094         switch (op) {
 1095 #if 0
 1096         case VFS_CTL_NOLOCKS:
 1097                 val = (nmp->nm_flag & NFSMNT_NOLOCKS) ? 1 : 0;
 1098                 if (req->oldptr != NULL) {
 1099                         error = SYSCTL_OUT(req, &val, sizeof(val));
 1100                         if (error)
 1101                                 return (error);
 1102                 }
 1103                 if (req->newptr != NULL) {
 1104                         error = SYSCTL_IN(req, &val, sizeof(val));
 1105                         if (error)
 1106                                 return (error);
 1107                         if (val)
 1108                                 nmp->nm_flag |= NFSMNT_NOLOCKS;
 1109                         else
 1110                                 nmp->nm_flag &= ~NFSMNT_NOLOCKS;
 1111                 }
 1112                 break;
 1113 #endif
 1114         case VFS_CTL_QUERY:
 1115                 mtx_lock(&nmp->nm_mtx);
 1116                 if (nmp->nm_state & NFSSTA_TIMEO)
 1117                         vq.vq_flags |= VQ_NOTRESP;
 1118                 mtx_unlock(&nmp->nm_mtx);
 1119 #if 0
 1120                 if (!(nmp->nm_flag & NFSMNT_NOLOCKS) &&
 1121                     (nmp->nm_state & NFSSTA_LOCKTIMEO))
 1122                         vq.vq_flags |= VQ_NOTRESPLOCK;
 1123 #endif
 1124                 error = SYSCTL_OUT(req, &vq, sizeof(vq));
 1125                 break;
 1126         case VFS_CTL_TIMEO:
 1127                 if (req->oldptr != NULL) {
 1128                         error = SYSCTL_OUT(req, &nmp->nm_tprintf_initial_delay,
 1129                             sizeof(nmp->nm_tprintf_initial_delay));
 1130                         if (error)
 1131                                 return (error);
 1132                 }
 1133                 if (req->newptr != NULL) {
 1134                         error = vfs_suser(mp, req->td);
 1135                         if (error)
 1136                                 return (error);
 1137                         error = SYSCTL_IN(req, &nmp->nm_tprintf_initial_delay,
 1138                             sizeof(nmp->nm_tprintf_initial_delay));
 1139                         if (error)
 1140                                 return (error);
 1141                         if (nmp->nm_tprintf_initial_delay < 0)
 1142                                 nmp->nm_tprintf_initial_delay = 0;
 1143                 }
 1144                 break;
 1145         default:
 1146                 return (ENOTSUP);
 1147         }
 1148         return (0);
 1149 }

Cache object: b03622f4e05437cce2512debcec887de


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