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: src/sys/nfsclient/nfs_vfsops.c,v 1.158.2.5 2005/06/26 23:55:50 green Exp $");
   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/limits.h>
   47 #include <sys/lock.h>
   48 #include <sys/malloc.h>
   49 #include <sys/mbuf.h>
   50 #include <sys/module.h>
   51 #include <sys/mount.h>
   52 #include <sys/proc.h>
   53 #include <sys/socket.h>
   54 #include <sys/socketvar.h>
   55 #include <sys/sockio.h>
   56 #include <sys/sysctl.h>
   57 #include <sys/vnode.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 
   83 uma_zone_t nfsmount_zone;
   84 
   85 struct nfsstats nfsstats;
   86 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem");
   87 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RD,
   88         &nfsstats, nfsstats, "S,nfsstats");
   89 static int nfs_ip_paranoia = 1;
   90 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW,
   91     &nfs_ip_paranoia, 0, "");
   92 #ifdef NFS_DEBUG
   93 int nfs_debug;
   94 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, "");
   95 #endif
   96 static int nfs_tprintf_initial_delay = NFS_TPRINTF_INITIAL_DELAY;
   97 SYSCTL_INT(_vfs_nfs, NFS_TPRINTF_INITIAL_DELAY,
   98         downdelayinitial, CTLFLAG_RW, &nfs_tprintf_initial_delay, 0, "");
   99 /* how long between console messages "nfs server foo not responding" */
  100 static int nfs_tprintf_delay = NFS_TPRINTF_DELAY;
  101 SYSCTL_INT(_vfs_nfs, NFS_TPRINTF_DELAY,
  102         downdelayinterval, CTLFLAG_RW, &nfs_tprintf_delay, 0, "");
  103 
  104 static int      nfs_iosize(struct nfsmount *nmp);
  105 static void     nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp);
  106 static int      mountnfs(struct nfs_args *, struct mount *,
  107                     struct sockaddr *, char *, char *, struct vnode **,
  108                     struct ucred *cred);
  109 static vfs_omount_t nfs_omount;
  110 static vfs_unmount_t nfs_unmount;
  111 static vfs_root_t nfs_root;
  112 static vfs_statfs_t nfs_statfs;
  113 static vfs_sync_t nfs_sync;
  114 static vfs_sysctl_t nfs_sysctl;
  115 
  116 /*
  117  * nfs vfs operations.
  118  */
  119 static struct vfsops nfs_vfsops = {
  120         .vfs_init =             nfs_init,
  121         .vfs_omount =           nfs_omount,
  122         .vfs_root =             nfs_root,
  123         .vfs_statfs =           nfs_statfs,
  124         .vfs_sync =             nfs_sync,
  125         .vfs_uninit =           nfs_uninit,
  126         .vfs_unmount =          nfs_unmount,
  127         .vfs_sysctl =           nfs_sysctl,
  128 };
  129 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK);
  130 
  131 /* So that loader and kldload(2) can find us, wherever we are.. */
  132 MODULE_VERSION(nfs, 1);
  133 
  134 static struct nfs_rpcops nfs_rpcops = {
  135         nfs_readrpc,
  136         nfs_writerpc,
  137         nfs_writebp,
  138         nfs_readlinkrpc,
  139         nfs_invaldir,
  140         nfs_commit,
  141 };
  142 
  143 /*
  144  * This structure must be filled in by a primary bootstrap or bootstrap
  145  * server for a diskless/dataless machine. It is initialized below just
  146  * to ensure that it is allocated to initialized data (.data not .bss).
  147  */
  148 struct nfs_diskless nfs_diskless = { { { 0 } } };
  149 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } };
  150 int nfs_diskless_valid = 0;
  151 
  152 SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD,
  153         &nfs_diskless_valid, 0, "");
  154 
  155 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD,
  156         nfsv3_diskless.root_hostnam, 0, "");
  157 
  158 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD,
  159         &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr,
  160         "%Ssockaddr_in", "");
  161 
  162 
  163 void            nfsargs_ntoh(struct nfs_args *);
  164 static int      nfs_mountdiskless(char *, char *, int,
  165                     struct sockaddr_in *, struct nfs_args *,
  166                     struct thread *, struct vnode **, struct mount *);
  167 static void     nfs_convert_diskless(void);
  168 static void     nfs_convert_oargs(struct nfs_args *args,
  169                     struct onfs_args *oargs);
  170 
  171 static int
  172 nfs_iosize(struct nfsmount *nmp)
  173 {
  174         int iosize;
  175 
  176         /*
  177          * Calculate the size used for io buffers.  Use the larger
  178          * of the two sizes to minimise nfs requests but make sure
  179          * that it is at least one VM page to avoid wasting buffer
  180          * space.
  181          */
  182         iosize = max(nmp->nm_rsize, nmp->nm_wsize);
  183         if (iosize < PAGE_SIZE) iosize = PAGE_SIZE;
  184         return iosize;
  185 }
  186 
  187 static void
  188 nfs_convert_oargs(struct nfs_args *args, struct onfs_args *oargs)
  189 {
  190 
  191         args->version = NFS_ARGSVERSION;
  192         args->addr = oargs->addr;
  193         args->addrlen = oargs->addrlen;
  194         args->sotype = oargs->sotype;
  195         args->proto = oargs->proto;
  196         args->fh = oargs->fh;
  197         args->fhsize = oargs->fhsize;
  198         args->flags = oargs->flags;
  199         args->wsize = oargs->wsize;
  200         args->rsize = oargs->rsize;
  201         args->readdirsize = oargs->readdirsize;
  202         args->timeo = oargs->timeo;
  203         args->retrans = oargs->retrans;
  204         args->maxgrouplist = oargs->maxgrouplist;
  205         args->readahead = oargs->readahead;
  206         args->deadthresh = oargs->deadthresh;
  207         args->hostname = oargs->hostname;
  208 }
  209 
  210 static void
  211 nfs_convert_diskless(void)
  212 {
  213 
  214         bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif,
  215                 sizeof(struct ifaliasreq));
  216         bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway,
  217                 sizeof(struct sockaddr_in));
  218         nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args);
  219         nfsv3_diskless.root_fhsize = NFSX_V2FH;
  220         bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V2FH);
  221         bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr,
  222                 sizeof(struct sockaddr_in));
  223         bcopy(nfs_diskless.root_hostnam, nfsv3_diskless.root_hostnam, MNAMELEN);
  224         nfsv3_diskless.root_time = nfs_diskless.root_time;
  225         bcopy(nfs_diskless.my_hostnam, nfsv3_diskless.my_hostnam,
  226                 MAXHOSTNAMELEN);
  227         nfs_diskless_valid = 3;
  228 }
  229 
  230 /*
  231  * nfs statfs call
  232  */
  233 static int
  234 nfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
  235 {
  236         struct vnode *vp;
  237         struct nfs_statfs *sfp;
  238         caddr_t bpos, dpos;
  239         struct nfsmount *nmp = VFSTONFS(mp);
  240         int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr;
  241         struct mbuf *mreq, *mrep, *md, *mb;
  242         struct nfsnode *np;
  243         u_quad_t tquad;
  244 
  245 #ifndef nolint
  246         sfp = NULL;
  247 #endif
  248         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
  249         if (error)
  250                 return (error);
  251         vp = NFSTOV(np);
  252         if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0)
  253                 (void)nfs_fsinfo(nmp, vp, td->td_ucred, td);
  254         nfsstats.rpccnt[NFSPROC_FSSTAT]++;
  255         mreq = nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3));
  256         mb = mreq;
  257         bpos = mtod(mb, caddr_t);
  258         nfsm_fhtom(vp, v3);
  259         nfsm_request(vp, NFSPROC_FSSTAT, td, td->td_ucred);
  260         if (v3)
  261                 nfsm_postop_attr(vp, retattr);
  262         if (error) {
  263                 if (mrep != NULL)
  264                         m_freem(mrep);
  265                 goto nfsmout;
  266         }
  267         sfp = nfsm_dissect(struct nfs_statfs *, NFSX_STATFS(v3));
  268         sbp->f_iosize = nfs_iosize(nmp);
  269         if (v3) {
  270                 sbp->f_bsize = NFS_FABLKSIZE;
  271                 tquad = fxdr_hyper(&sfp->sf_tbytes);
  272                 sbp->f_blocks = tquad / NFS_FABLKSIZE;
  273                 tquad = fxdr_hyper(&sfp->sf_fbytes);
  274                 sbp->f_bfree = tquad / NFS_FABLKSIZE;
  275                 tquad = fxdr_hyper(&sfp->sf_abytes);
  276                 sbp->f_bavail = tquad / NFS_FABLKSIZE;
  277                 sbp->f_files = (fxdr_unsigned(int32_t,
  278                     sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff);
  279                 sbp->f_ffree = (fxdr_unsigned(int32_t,
  280                     sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff);
  281         } else {
  282                 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
  283                 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
  284                 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
  285                 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
  286                 sbp->f_files = 0;
  287                 sbp->f_ffree = 0;
  288         }
  289         if (sbp != &mp->mnt_stat) {
  290                 sbp->f_type = mp->mnt_vfc->vfc_typenum;
  291                 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
  292                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
  293         }
  294         m_freem(mrep);
  295 nfsmout:
  296         vput(vp);
  297         return (error);
  298 }
  299 
  300 /*
  301  * nfs version 3 fsinfo rpc call
  302  */
  303 int
  304 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct ucred *cred,
  305     struct thread *td)
  306 {
  307         struct nfsv3_fsinfo *fsp;
  308         u_int32_t pref, max;
  309         caddr_t bpos, dpos;
  310         int error = 0, retattr;
  311         struct mbuf *mreq, *mrep, *md, *mb;
  312         u_int64_t maxfsize;
  313 
  314         nfsstats.rpccnt[NFSPROC_FSINFO]++;
  315         mreq = nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1));
  316         mb = mreq;
  317         bpos = mtod(mb, caddr_t);
  318         nfsm_fhtom(vp, 1);
  319         nfsm_request(vp, NFSPROC_FSINFO, td, cred);
  320         nfsm_postop_attr(vp, retattr);
  321         if (!error) {
  322                 fsp = nfsm_dissect(struct nfsv3_fsinfo *, NFSX_V3FSINFO);
  323                 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
  324                 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
  325                         nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
  326                                 ~(NFS_FABLKSIZE - 1);
  327                 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
  328                 if (max < nmp->nm_wsize && max > 0) {
  329                         nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
  330                         if (nmp->nm_wsize == 0)
  331                                 nmp->nm_wsize = max;
  332                 }
  333                 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
  334                 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
  335                         nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
  336                                 ~(NFS_FABLKSIZE - 1);
  337                 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
  338                 if (max < nmp->nm_rsize && max > 0) {
  339                         nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
  340                         if (nmp->nm_rsize == 0)
  341                                 nmp->nm_rsize = max;
  342                 }
  343                 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
  344                 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ)
  345                         nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) &
  346                                 ~(NFS_DIRBLKSIZ - 1);
  347                 if (max < nmp->nm_readdirsize && max > 0) {
  348                         nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1);
  349                         if (nmp->nm_readdirsize == 0)
  350                                 nmp->nm_readdirsize = max;
  351                 }
  352                 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
  353                 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
  354                         nmp->nm_maxfilesize = maxfsize;
  355                 nmp->nm_mountp->mnt_stat.f_iosize = nfs_iosize(nmp);
  356                 nmp->nm_state |= NFSSTA_GOTFSINFO;
  357         }
  358         m_freem(mrep);
  359 nfsmout:
  360         return (error);
  361 }
  362 
  363 /*
  364  * Mount a remote root fs via. nfs. This depends on the info in the
  365  * nfs_diskless structure that has been filled in properly by some primary
  366  * bootstrap.
  367  * It goes something like this:
  368  * - do enough of "ifconfig" by calling ifioctl() so that the system
  369  *   can talk to the server
  370  * - If nfs_diskless.mygateway is filled in, use that address as
  371  *   a default gateway.
  372  * - build the rootfs mount point and call mountnfs() to do the rest.
  373  *
  374  * It is assumed to be safe to read, modify, and write the nfsv3_diskless
  375  * structure, as well as other global NFS client variables here, as
  376  * nfs_mountroot() will be called once in the boot before any other NFS
  377  * client activity occurs.
  378  */
  379 int
  380 nfs_mountroot(struct mount *mp, struct thread *td)
  381 {
  382         struct nfsv3_diskless *nd = &nfsv3_diskless;
  383         struct socket *so;
  384         struct vnode *vp;
  385         int error, i;
  386         u_long l;
  387         char buf[128];
  388 
  389         NET_ASSERT_GIANT();
  390 
  391 #if defined(BOOTP_NFSROOT) && defined(BOOTP)
  392         bootpc_init();          /* use bootp to get nfs_diskless filled in */
  393 #elif defined(NFS_ROOT)
  394         nfs_setup_diskless();
  395 #endif
  396 
  397         if (nfs_diskless_valid == 0)
  398                 return (-1);
  399         if (nfs_diskless_valid == 1)
  400                 nfs_convert_diskless();
  401 
  402         /*
  403          * XXX splnet, so networks will receive...
  404          */
  405         splnet();
  406 
  407         /*
  408          * Do enough of ifconfig(8) so that the critical net interface can
  409          * talk to the server.
  410          */
  411         error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0,
  412             td->td_ucred, td);
  413         if (error)
  414                 panic("nfs_mountroot: socreate(%04x): %d",
  415                         nd->myif.ifra_addr.sa_family, error);
  416 
  417 #if 0 /* XXX Bad idea */
  418         /*
  419          * We might not have been told the right interface, so we pass
  420          * over the first ten interfaces of the same kind, until we get
  421          * one of them configured.
  422          */
  423 
  424         for (i = strlen(nd->myif.ifra_name) - 1;
  425                 nd->myif.ifra_name[i] >= '' &&
  426                 nd->myif.ifra_name[i] <= '9';
  427                 nd->myif.ifra_name[i] ++) {
  428                 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
  429                 if(!error)
  430                         break;
  431         }
  432 #endif
  433         error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
  434         if (error)
  435                 panic("nfs_mountroot: SIOCAIFADDR: %d", error);
  436         soclose(so);
  437 
  438         /*
  439          * If the gateway field is filled in, set it as the default route.
  440          * Note that pxeboot will set a default route of 0 if the route
  441          * is not set by the DHCP server.  Check also for a value of 0
  442          * to avoid panicking inappropriately in that situation.
  443          */
  444         if (nd->mygateway.sin_len != 0 &&
  445             nd->mygateway.sin_addr.s_addr != 0) {
  446                 struct sockaddr_in mask, sin;
  447 
  448                 bzero((caddr_t)&mask, sizeof(mask));
  449                 sin = mask;
  450                 sin.sin_family = AF_INET;
  451                 sin.sin_len = sizeof(sin);
  452                 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin,
  453                     (struct sockaddr *)&nd->mygateway,
  454                     (struct sockaddr *)&mask,
  455                     RTF_UP | RTF_GATEWAY, NULL);
  456                 if (error)
  457                         panic("nfs_mountroot: RTM_ADD: %d", error);
  458         }
  459 
  460         /*
  461          * Create the rootfs mount point.
  462          */
  463         nd->root_args.fh = nd->root_fh;
  464         nd->root_args.fhsize = nd->root_fhsize;
  465         l = ntohl(nd->root_saddr.sin_addr.s_addr);
  466         snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s",
  467                 (l >> 24) & 0xff, (l >> 16) & 0xff,
  468                 (l >>  8) & 0xff, (l >>  0) & 0xff, nd->root_hostnam);
  469         printf("NFS ROOT: %s\n", buf);
  470         if ((error = nfs_mountdiskless(buf, "/", MNT_RDONLY,
  471             &nd->root_saddr, &nd->root_args, td, &vp, mp)) != 0) {
  472                 return (error);
  473         }
  474 
  475         /*
  476          * This is not really an nfs issue, but it is much easier to
  477          * set hostname here and then let the "/etc/rc.xxx" files
  478          * mount the right /var based upon its preset value.
  479          */
  480         bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN);
  481         hostname[MAXHOSTNAMELEN - 1] = '\0';
  482         for (i = 0; i < MAXHOSTNAMELEN; i++)
  483                 if (hostname[i] == '\0')
  484                         break;
  485         inittodr(ntohl(nd->root_time));
  486         return (0);
  487 }
  488 
  489 /*
  490  * Internal version of mount system call for diskless setup.
  491  */
  492 static int
  493 nfs_mountdiskless(char *path, char *which, int mountflag,
  494     struct sockaddr_in *sin, struct nfs_args *args, struct thread *td,
  495     struct vnode **vpp, struct mount *mp)
  496 {
  497         struct sockaddr *nam;
  498         int error;
  499 
  500         mp->mnt_kern_flag = 0;
  501         mp->mnt_flag = mountflag;
  502         nam = sodupsockaddr((struct sockaddr *)sin, M_WAITOK);
  503         if ((error = mountnfs(args, mp, nam, which, path, vpp,
  504             td->td_ucred)) != 0) {
  505                 printf("nfs_mountroot: mount %s on %s: %d", path, which, error);
  506                 return (error);
  507         }
  508         (void) copystr(which, mp->mnt_stat.f_mntonname, MNAMELEN - 1, 0);
  509         return (0);
  510 }
  511 
  512 static void
  513 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp)
  514 {
  515         int s;
  516         int adjsock;
  517         int maxio;
  518 
  519         s = splnet();
  520         /*
  521          * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
  522          * no sense in that context.
  523          */
  524         if (argp->sotype == SOCK_STREAM)
  525                 nmp->nm_flag &= ~NFSMNT_NOCONN;
  526 
  527         /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */
  528         if ((argp->flags & NFSMNT_NFSV3) == 0)
  529                 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
  530 
  531         /* Re-bind if rsrvd port requested and wasn't on one */
  532         adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
  533                   && (argp->flags & NFSMNT_RESVPORT);
  534         /* Also re-bind if we're switching to/from a connected UDP socket */
  535         adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
  536                     (argp->flags & NFSMNT_NOCONN));
  537 
  538         /* Update flags atomically.  Don't change the lock bits. */
  539         nmp->nm_flag = argp->flags | nmp->nm_flag;
  540         splx(s);
  541 
  542         if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
  543                 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
  544                 if (nmp->nm_timeo < NFS_MINTIMEO)
  545                         nmp->nm_timeo = NFS_MINTIMEO;
  546                 else if (nmp->nm_timeo > NFS_MAXTIMEO)
  547                         nmp->nm_timeo = NFS_MAXTIMEO;
  548         }
  549 
  550         if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
  551                 nmp->nm_retry = argp->retrans;
  552                 if (nmp->nm_retry > NFS_MAXREXMIT)
  553                         nmp->nm_retry = NFS_MAXREXMIT;
  554         }
  555 
  556         if (argp->flags & NFSMNT_NFSV3) {
  557                 if (argp->sotype == SOCK_DGRAM)
  558                         maxio = NFS_MAXDGRAMDATA;
  559                 else
  560                         maxio = NFS_MAXDATA;
  561         } else
  562                 maxio = NFS_V2MAXDATA;
  563 
  564         if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
  565                 nmp->nm_wsize = argp->wsize;
  566                 /* Round down to multiple of blocksize */
  567                 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
  568                 if (nmp->nm_wsize <= 0)
  569                         nmp->nm_wsize = NFS_FABLKSIZE;
  570         }
  571         if (nmp->nm_wsize > maxio)
  572                 nmp->nm_wsize = maxio;
  573         if (nmp->nm_wsize > MAXBSIZE)
  574                 nmp->nm_wsize = MAXBSIZE;
  575 
  576         if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
  577                 nmp->nm_rsize = argp->rsize;
  578                 /* Round down to multiple of blocksize */
  579                 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
  580                 if (nmp->nm_rsize <= 0)
  581                         nmp->nm_rsize = NFS_FABLKSIZE;
  582         }
  583         if (nmp->nm_rsize > maxio)
  584                 nmp->nm_rsize = maxio;
  585         if (nmp->nm_rsize > MAXBSIZE)
  586                 nmp->nm_rsize = MAXBSIZE;
  587 
  588         if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
  589                 nmp->nm_readdirsize = argp->readdirsize;
  590         }
  591         if (nmp->nm_readdirsize > maxio)
  592                 nmp->nm_readdirsize = maxio;
  593         if (nmp->nm_readdirsize > nmp->nm_rsize)
  594                 nmp->nm_readdirsize = nmp->nm_rsize;
  595 
  596         if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0)
  597                 nmp->nm_acregmin = argp->acregmin;
  598         else
  599                 nmp->nm_acregmin = NFS_MINATTRTIMO;
  600         if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0)
  601                 nmp->nm_acregmax = argp->acregmax;
  602         else
  603                 nmp->nm_acregmax = NFS_MAXATTRTIMO;
  604         if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0)
  605                 nmp->nm_acdirmin = argp->acdirmin;
  606         else
  607                 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO;
  608         if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0)
  609                 nmp->nm_acdirmax = argp->acdirmax;
  610         else
  611                 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO;
  612         if (nmp->nm_acdirmin > nmp->nm_acdirmax)
  613                 nmp->nm_acdirmin = nmp->nm_acdirmax;
  614         if (nmp->nm_acregmin > nmp->nm_acregmax)
  615                 nmp->nm_acregmin = nmp->nm_acregmax;
  616 
  617         if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) {
  618                 if (argp->maxgrouplist <= NFS_MAXGRPS)
  619                         nmp->nm_numgrps = argp->maxgrouplist;
  620                 else
  621                         nmp->nm_numgrps = NFS_MAXGRPS;
  622         }
  623         if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) {
  624                 if (argp->readahead <= NFS_MAXRAHEAD)
  625                         nmp->nm_readahead = argp->readahead;
  626                 else
  627                         nmp->nm_readahead = NFS_MAXRAHEAD;
  628         }
  629         if ((argp->flags & NFSMNT_WCOMMITSIZE) && argp->wcommitsize >= 0) {
  630                 if (argp->wcommitsize < nmp->nm_wsize)
  631                         nmp->nm_wcommitsize = nmp->nm_wsize;
  632                 else
  633                         nmp->nm_wcommitsize = argp->wcommitsize;
  634         }
  635         if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 0) {
  636                 if (argp->deadthresh <= NFS_MAXDEADTHRESH)
  637                         nmp->nm_deadthresh = argp->deadthresh;
  638                 else
  639                         nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
  640         }
  641 
  642         adjsock |= ((nmp->nm_sotype != argp->sotype) ||
  643                     (nmp->nm_soproto != argp->proto));
  644         nmp->nm_sotype = argp->sotype;
  645         nmp->nm_soproto = argp->proto;
  646 
  647         if (nmp->nm_so && adjsock) {
  648                 nfs_safedisconnect(nmp);
  649                 if (nmp->nm_sotype == SOCK_DGRAM)
  650                         while (nfs_connect(nmp, NULL)) {
  651                                 printf("nfs_args: retrying connect\n");
  652                                 (void) tsleep((caddr_t)&lbolt,
  653                                               PSOCK, "nfscon", 0);
  654                         }
  655         }
  656 }
  657 
  658 /*
  659  * VFS Operations.
  660  *
  661  * mount system call
  662  * It seems a bit dumb to copyinstr() the host and path here and then
  663  * bcopy() them in mountnfs(), but I wanted to detect errors before
  664  * doing the sockargs() call because sockargs() allocates an mbuf and
  665  * an error after that means that I have to release the mbuf.
  666  */
  667 /* ARGSUSED */
  668 static int
  669 nfs_omount(struct mount *mp, char *path, caddr_t data, struct thread *td)
  670 {
  671         int error;
  672         struct nfs_args args;
  673         struct sockaddr *nam;
  674         struct vnode *vp;
  675         char hst[MNAMELEN];
  676         size_t len;
  677         u_char nfh[NFSX_V3FHMAX];
  678 
  679         if (path == NULL)
  680                 return (nfs_mountroot(mp, td));
  681         error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args));
  682         if (error)
  683                 return (error);
  684         if (args.version != NFS_ARGSVERSION) {
  685 #ifdef COMPAT_PRELITE2
  686                 /*
  687                  * If the argument version is unknown, then assume the
  688                  * caller is a pre-lite2 4.4BSD client and convert its
  689                  * arguments.
  690                  */
  691                 struct onfs_args oargs;
  692                 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args));
  693                 if (error)
  694                         return (error);
  695                 nfs_convert_oargs(&args,&oargs);
  696 #else /* !COMPAT_PRELITE2 */
  697                 return (EPROGMISMATCH);
  698 #endif /* COMPAT_PRELITE2 */
  699         }
  700         if (mp->mnt_flag & MNT_UPDATE) {
  701                 struct nfsmount *nmp = VFSTONFS(mp);
  702 
  703                 if (nmp == NULL)
  704                         return (EIO);
  705                 /*
  706                  * When doing an update, we can't change from or to
  707                  * v3, switch lockd strategies or change cookie translation
  708                  */
  709                 args.flags = (args.flags &
  710                     ~(NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/)) |
  711                     (nmp->nm_flag &
  712                         (NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/));
  713                 nfs_decode_args(nmp, &args);
  714                 return (0);
  715         }
  716 
  717         /*
  718          * Make the nfs_ip_paranoia sysctl serve as the default connection
  719          * or no-connection mode for those protocols that support 
  720          * no-connection mode (the flag will be cleared later for protocols
  721          * that do not support no-connection mode).  This will allow a client
  722          * to receive replies from a different IP then the request was
  723          * sent to.  Note: default value for nfs_ip_paranoia is 1 (paranoid),
  724          * not 0.
  725          */
  726         if (nfs_ip_paranoia == 0)
  727                 args.flags |= NFSMNT_NOCONN;
  728         if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX)
  729                 return (EINVAL);
  730         error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
  731         if (error)
  732                 return (error);
  733         error = copyinstr(args.hostname, hst, MNAMELEN-1, &len);
  734         if (error)
  735                 return (error);
  736         bzero(&hst[len], MNAMELEN - len);
  737         /* sockargs() call must be after above copyin() calls */
  738         error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen);
  739         if (error)
  740                 return (error);
  741         args.fh = nfh;
  742         error = mountnfs(&args, mp, nam, path, hst, &vp, td->td_ucred);
  743         return (error);
  744 }
  745 
  746 /*
  747  * Common code for mount and mountroot
  748  */
  749 static int
  750 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam,
  751     char *pth, char *hst, struct vnode **vpp, struct ucred *cred)
  752 {
  753         struct nfsmount *nmp;
  754         struct nfsnode *np;
  755         int error;
  756         struct vattr attrs;
  757 
  758         if (mp->mnt_flag & MNT_UPDATE) {
  759                 nmp = VFSTONFS(mp);
  760                 /* update paths, file handles, etc, here        XXX */
  761                 FREE(nam, M_SONAME);
  762                 return (0);
  763         } else {
  764                 nmp = uma_zalloc(nfsmount_zone, M_WAITOK);
  765                 bzero((caddr_t)nmp, sizeof (struct nfsmount));
  766                 TAILQ_INIT(&nmp->nm_bufq);
  767                 mp->mnt_data = (qaddr_t)nmp;
  768         }
  769         vfs_getnewfsid(mp);
  770         nmp->nm_mountp = mp;
  771 
  772         /*
  773          * V2 can only handle 32 bit filesizes.  A 4GB-1 limit may be too
  774          * high, depending on whether we end up with negative offsets in
  775          * the client or server somewhere.  2GB-1 may be safer.
  776          *
  777          * For V3, nfs_fsinfo will adjust this as necessary.  Assume maximum
  778          * that we can handle until we find out otherwise.
  779          * XXX Our "safe" limit on the client is what we can store in our
  780          * buffer cache using signed(!) block numbers.
  781          */
  782         if ((argp->flags & NFSMNT_NFSV3) == 0)
  783                 nmp->nm_maxfilesize = 0xffffffffLL;
  784         else
  785                 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
  786 
  787         nmp->nm_timeo = NFS_TIMEO;
  788         nmp->nm_retry = NFS_RETRANS;
  789         if ((argp->flags & NFSMNT_NFSV3) && argp->sotype == SOCK_STREAM) {
  790                 nmp->nm_wsize = nmp->nm_rsize = NFS_MAXDATA;
  791         } else {
  792                 nmp->nm_wsize = NFS_WSIZE;
  793                 nmp->nm_rsize = NFS_RSIZE;
  794         }
  795         nmp->nm_wcommitsize = hibufspace / (desiredvnodes / 1000);
  796         nmp->nm_readdirsize = NFS_READDIRSIZE;
  797         nmp->nm_numgrps = NFS_MAXGRPS;
  798         nmp->nm_readahead = NFS_DEFRAHEAD;
  799         nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
  800         nmp->nm_tprintf_delay = nfs_tprintf_delay;
  801         if (nmp->nm_tprintf_delay < 0)
  802                 nmp->nm_tprintf_delay = 0;
  803         nmp->nm_tprintf_initial_delay = nfs_tprintf_initial_delay;
  804         if (nmp->nm_tprintf_initial_delay < 0)
  805                 nmp->nm_tprintf_initial_delay = 0;
  806         nmp->nm_fhsize = argp->fhsize;
  807         bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize);
  808         bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
  809         bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN);
  810         nmp->nm_nam = nam;
  811         /* Set up the sockets and per-host congestion */
  812         nmp->nm_sotype = argp->sotype;
  813         nmp->nm_soproto = argp->proto;
  814         nmp->nm_rpcops = &nfs_rpcops;
  815 
  816         nfs_decode_args(nmp, argp);
  817 
  818         /*
  819          * For Connection based sockets (TCP,...) defer the connect until
  820          * the first request, in case the server is not responding.
  821          */
  822         if (nmp->nm_sotype == SOCK_DGRAM &&
  823                 (error = nfs_connect(nmp, NULL)))
  824                 goto bad;
  825 
  826         /*
  827          * This is silly, but it has to be set so that vinifod() works.
  828          * We do not want to do an nfs_statfs() here since we can get
  829          * stuck on a dead server and we are holding a lock on the mount
  830          * point.
  831          */
  832         mp->mnt_stat.f_iosize = nfs_iosize(nmp);
  833         /*
  834          * A reference count is needed on the nfsnode representing the
  835          * remote root.  If this object is not persistent, then backward
  836          * traversals of the mount point (i.e. "..") will not work if
  837          * the nfsnode gets flushed out of the cache. Ufs does not have
  838          * this problem, because one can identify root inodes by their
  839          * number == ROOTINO (2).
  840          */
  841         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
  842         if (error)
  843                 goto bad;
  844         *vpp = NFSTOV(np);
  845 
  846         /*
  847          * Get file attributes and transfer parameters for the
  848          * mountpoint.  This has the side effect of filling in
  849          * (*vpp)->v_type with the correct value.
  850          */
  851         if (argp->flags & NFSMNT_NFSV3)
  852                 nfs_fsinfo(nmp, *vpp, curthread->td_ucred, curthread);
  853         else
  854                 VOP_GETATTR(*vpp, &attrs, curthread->td_ucred, curthread);
  855 
  856         /*
  857          * Lose the lock but keep the ref.
  858          */
  859         VOP_UNLOCK(*vpp, 0, curthread);
  860 
  861         return (0);
  862 bad:
  863         nfs_disconnect(nmp);
  864         uma_zfree(nfsmount_zone, nmp);
  865         FREE(nam, M_SONAME);
  866         return (error);
  867 }
  868 
  869 /*
  870  * unmount system call
  871  */
  872 static int
  873 nfs_unmount(struct mount *mp, int mntflags, struct thread *td)
  874 {
  875         struct nfsmount *nmp;
  876         int error, flags = 0;
  877 
  878         if (mntflags & MNT_FORCE)
  879                 flags |= FORCECLOSE;
  880         nmp = VFSTONFS(mp);
  881         /*
  882          * Goes something like this..
  883          * - Call vflush() to clear out vnodes for this filesystem
  884          * - Close the socket
  885          * - Free up the data structures
  886          */
  887         /* In the forced case, cancel any outstanding requests. */
  888         if (flags & FORCECLOSE) {
  889                 error = nfs_nmcancelreqs(nmp);
  890                 if (error)
  891                         return (error);
  892         }
  893         /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */
  894         error = vflush(mp, 1, flags, td);
  895         if (error)
  896                 return (error);
  897 
  898         /*
  899          * We are now committed to the unmount.
  900          */
  901         nfs_disconnect(nmp);
  902         FREE(nmp->nm_nam, M_SONAME);
  903 
  904         uma_zfree(nfsmount_zone, nmp);
  905         return (0);
  906 }
  907 
  908 /*
  909  * Return root of a filesystem
  910  */
  911 static int
  912 nfs_root(struct mount *mp, struct vnode **vpp, struct thread *td)
  913 {
  914         struct vnode *vp;
  915         struct nfsmount *nmp;
  916         struct nfsnode *np;
  917         int error;
  918 
  919         nmp = VFSTONFS(mp);
  920         error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
  921         if (error)
  922                 return (error);
  923         vp = NFSTOV(np);
  924         /*
  925          * Get transfer parameters and attributes for root vnode once.
  926          */
  927         if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0 &&
  928             (nmp->nm_flag & NFSMNT_NFSV3)) {
  929                 nfs_fsinfo(nmp, vp, curthread->td_ucred, curthread);
  930         }
  931         if (vp->v_type == VNON)
  932             vp->v_type = VDIR;
  933         vp->v_vflag |= VV_ROOT;
  934         *vpp = vp;
  935         return (0);
  936 }
  937 
  938 /*
  939  * Flush out the buffer cache
  940  */
  941 /* ARGSUSED */
  942 static int
  943 nfs_sync(struct mount *mp, int waitfor, struct ucred *cred, struct thread *td)
  944 {
  945         struct vnode *vp, *nvp;
  946         int error, allerror = 0;
  947 
  948         /*
  949          * Force stale buffer cache information to be flushed.
  950          */
  951         MNT_ILOCK(mp);
  952 loop:
  953         MNT_VNODE_FOREACH(vp, mp, nvp) {
  954                 VI_LOCK(vp);
  955                 MNT_IUNLOCK(mp);
  956                 if (VOP_ISLOCKED(vp, NULL) || TAILQ_EMPTY(&vp->v_dirtyblkhd) ||
  957                     waitfor == MNT_LAZY) {
  958                         VI_UNLOCK(vp);
  959                         MNT_ILOCK(mp);
  960                         continue;
  961                 }
  962                 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
  963                         MNT_ILOCK(mp);
  964                         goto loop;
  965                 }
  966                 error = VOP_FSYNC(vp, cred, waitfor, td);
  967                 if (error)
  968                         allerror = error;
  969                 VOP_UNLOCK(vp, 0, td);
  970                 vrele(vp);
  971 
  972                 MNT_ILOCK(mp);
  973         }
  974         MNT_IUNLOCK(mp);
  975         return (allerror);
  976 }
  977 
  978 static int
  979 nfs_sysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
  980 {
  981         struct nfsmount *nmp = VFSTONFS(mp);
  982         struct vfsquery vq;
  983         int error;
  984 
  985         bzero(&vq, sizeof(vq));
  986         switch (op) {
  987 #if 0
  988         case VFS_CTL_NOLOCKS:
  989                 val = (nmp->nm_flag & NFSMNT_NOLOCKS) ? 1 : 0;
  990                 if (req->oldptr != NULL) {
  991                         error = SYSCTL_OUT(req, &val, sizeof(val));
  992                         if (error)
  993                                 return (error);
  994                 }
  995                 if (req->newptr != NULL) {
  996                         error = SYSCTL_IN(req, &val, sizeof(val));
  997                         if (error)
  998                                 return (error);
  999                         if (val)
 1000                                 nmp->nm_flag |= NFSMNT_NOLOCKS;
 1001                         else
 1002                                 nmp->nm_flag &= ~NFSMNT_NOLOCKS;
 1003                 }
 1004                 break;
 1005 #endif
 1006         case VFS_CTL_QUERY:
 1007                 if (nmp->nm_state & NFSSTA_TIMEO)
 1008                         vq.vq_flags |= VQ_NOTRESP;
 1009 #if 0
 1010                 if (!(nmp->nm_flag & NFSMNT_NOLOCKS) &&
 1011                     (nmp->nm_state & NFSSTA_LOCKTIMEO))
 1012                         vq.vq_flags |= VQ_NOTRESPLOCK;
 1013 #endif
 1014                 error = SYSCTL_OUT(req, &vq, sizeof(vq));
 1015                 break;
 1016         case VFS_CTL_TIMEO:
 1017                 if (req->oldptr != NULL) {
 1018                         error = SYSCTL_OUT(req, &nmp->nm_tprintf_initial_delay,
 1019                             sizeof(nmp->nm_tprintf_initial_delay));
 1020                         if (error)
 1021                                 return (error);
 1022                 }
 1023                 if (req->newptr != NULL) {
 1024                         error = vfs_suser(mp, req->td);
 1025                         if (error)
 1026                                 return (error);
 1027                         error = SYSCTL_IN(req, &nmp->nm_tprintf_initial_delay,
 1028                             sizeof(nmp->nm_tprintf_initial_delay));
 1029                         if (error)
 1030                                 return (error);
 1031                         if (nmp->nm_tprintf_initial_delay < 0)
 1032                                 nmp->nm_tprintf_initial_delay = 0;
 1033                 }
 1034                 break;
 1035         default:
 1036                 return (ENOTSUP);
 1037         }
 1038         return (0);
 1039 }

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