The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_vfsops.c

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    1 /*      $NetBSD: nfs_vfsops.c,v 1.135.2.1 2004/05/29 09:04:02 tron Exp $        */
    2 
    3 /*
    4  * Copyright (c) 1989, 1993, 1995
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Rick Macklem at The University of Guelph.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)nfs_vfsops.c        8.12 (Berkeley) 5/20/95
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.135.2.1 2004/05/29 09:04:02 tron Exp $");
   39 
   40 #if defined(_KERNEL_OPT)
   41 #include "opt_compat_netbsd.h"
   42 #include "opt_nfs.h"
   43 #endif
   44 
   45 #include <sys/param.h>
   46 #include <sys/ioctl.h>
   47 #include <sys/signal.h>
   48 #include <sys/proc.h>
   49 #include <sys/namei.h>
   50 #include <sys/device.h>
   51 #include <sys/vnode.h>
   52 #include <sys/kernel.h>
   53 #include <sys/mount.h>
   54 #include <sys/buf.h>
   55 #include <sys/mbuf.h>
   56 #include <sys/socket.h>
   57 #include <sys/socketvar.h>
   58 #include <sys/sysctl.h>
   59 #include <sys/systm.h>
   60 
   61 #include <net/if.h>
   62 #include <net/route.h>
   63 #include <netinet/in.h>
   64 
   65 #include <nfs/rpcv2.h>
   66 #include <nfs/nfsproto.h>
   67 #include <nfs/nfsnode.h>
   68 #include <nfs/nfs.h>
   69 #include <nfs/nfsmount.h>
   70 #include <nfs/xdr_subs.h>
   71 #include <nfs/nfsm_subs.h>
   72 #include <nfs/nfsdiskless.h>
   73 #include <nfs/nqnfs.h>
   74 #include <nfs/nfs_var.h>
   75 
   76 extern struct nfsstats nfsstats;
   77 extern int nfs_ticks;
   78 
   79 MALLOC_DEFINE(M_NFSMNT, "NFS mount", "NFS mount structure");
   80 
   81 /*
   82  * nfs vfs operations.
   83  */
   84 
   85 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc;
   86 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc;
   87 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc;
   88 
   89 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = {
   90         &nfsv2_vnodeop_opv_desc,
   91         &spec_nfsv2nodeop_opv_desc,
   92         &fifo_nfsv2nodeop_opv_desc,
   93         NULL,
   94 };
   95 
   96 struct vfsops nfs_vfsops = {
   97         MOUNT_NFS,
   98         nfs_mount,
   99         nfs_start,
  100         nfs_unmount,
  101         nfs_root,
  102         nfs_quotactl,
  103         nfs_statfs,
  104         nfs_sync,
  105         nfs_vget,
  106         nfs_fhtovp,
  107         nfs_vptofh,
  108         nfs_vfs_init,
  109         nfs_vfs_reinit,
  110         nfs_vfs_done,
  111         NULL,
  112         nfs_mountroot,
  113         nfs_checkexp,
  114         nfs_vnodeopv_descs,
  115 };
  116 
  117 extern u_int32_t nfs_procids[NFS_NPROCS];
  118 extern u_int32_t nfs_prog, nfs_vers;
  119 
  120 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *,
  121     struct mount **, struct vnode **, struct proc *));
  122 
  123 /*
  124  * nfs statfs call
  125  */
  126 int
  127 nfs_statfs(mp, sbp, p)
  128         struct mount *mp;
  129         struct statfs *sbp;
  130         struct proc *p;
  131 {
  132         struct vnode *vp;
  133         struct nfs_statfs *sfp;
  134         caddr_t cp;
  135         u_int32_t *tl;
  136         int32_t t1, t2;
  137         caddr_t bpos, dpos, cp2;
  138         struct nfsmount *nmp = VFSTONFS(mp);
  139         int error = 0, retattr;
  140 #ifdef NFS_V2_ONLY
  141         const int v3 = 0;
  142 #else
  143         int v3 = (nmp->nm_flag & NFSMNT_NFSV3);
  144 #endif
  145         struct mbuf *mreq, *mrep = NULL, *md, *mb;
  146         struct ucred *cred;
  147         u_quad_t tquad;
  148         struct nfsnode *np;
  149 
  150 #ifndef nolint
  151         sfp = (struct nfs_statfs *)0;
  152 #endif
  153         vp = nmp->nm_vnode;
  154         np = VTONFS(vp);
  155         cred = crget();
  156         cred->cr_ngroups = 0;
  157 #ifndef NFS_V2_ONLY
  158         if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0)
  159                 (void)nfs_fsinfo(nmp, vp, cred, p);
  160 #endif
  161         nfsstats.rpccnt[NFSPROC_FSSTAT]++;
  162         nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3));
  163         nfsm_fhtom(np, v3);
  164         nfsm_request(np, NFSPROC_FSSTAT, p, cred);
  165         if (v3)
  166                 nfsm_postop_attr(vp, retattr, 0);
  167         if (error) {
  168                 if (mrep != NULL) {
  169                         if (mrep->m_next != NULL)
  170                                 printf("nfs_vfsops: nfs_statfs would loose buffers\n");
  171                         m_freem(mrep);
  172                 }
  173                 goto nfsmout;
  174         }
  175         nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
  176 #ifdef COMPAT_09
  177         sbp->f_type = 2;
  178 #else
  179         sbp->f_type = 0;
  180 #endif
  181         sbp->f_flags = nmp->nm_flag;
  182         sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize);
  183         if (v3) {
  184                 sbp->f_bsize = NFS_FABLKSIZE;
  185                 tquad = fxdr_hyper(&sfp->sf_tbytes);
  186                 sbp->f_blocks = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
  187                 tquad = fxdr_hyper(&sfp->sf_fbytes);
  188                 sbp->f_bfree = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
  189                 tquad = fxdr_hyper(&sfp->sf_abytes);
  190                 sbp->f_bavail = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
  191                 tquad = fxdr_hyper(&sfp->sf_tfiles);
  192                 sbp->f_files = (long)tquad;
  193                 tquad = fxdr_hyper(&sfp->sf_ffiles);
  194                 sbp->f_ffree = (long)tquad;
  195         } else {
  196                 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
  197                 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
  198                 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
  199                 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
  200                 sbp->f_files = 0;
  201                 sbp->f_ffree = 0;
  202         }
  203         copy_statfs_info(sbp, mp);
  204         nfsm_reqdone;
  205         crfree(cred);
  206         return (error);
  207 }
  208 
  209 #ifndef NFS_V2_ONLY
  210 /*
  211  * nfs version 3 fsinfo rpc call
  212  */
  213 int
  214 nfs_fsinfo(nmp, vp, cred, p)
  215         struct nfsmount *nmp;
  216         struct vnode *vp;
  217         struct ucred *cred;
  218         struct proc *p;
  219 {
  220         struct nfsv3_fsinfo *fsp;
  221         caddr_t cp;
  222         int32_t t1, t2;
  223         u_int32_t *tl, pref, max;
  224         caddr_t bpos, dpos, cp2;
  225         int error = 0, retattr;
  226         struct mbuf *mreq, *mrep, *md, *mb;
  227         u_int64_t maxfsize;
  228         struct nfsnode *np = VTONFS(vp);
  229 
  230         nfsstats.rpccnt[NFSPROC_FSINFO]++;
  231         nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1));
  232         nfsm_fhtom(np, 1);
  233         nfsm_request(np, NFSPROC_FSINFO, p, cred);
  234         nfsm_postop_attr(vp, retattr, 0);
  235         if (!error) {
  236                 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO);
  237                 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
  238                 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 &&
  239                     pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
  240                         nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
  241                                 ~(NFS_FABLKSIZE - 1);
  242                 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
  243                 if (max < nmp->nm_wsize && max > 0) {
  244                         nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
  245                         if (nmp->nm_wsize == 0)
  246                                 nmp->nm_wsize = max;
  247                 }
  248                 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
  249                 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 &&
  250                     pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
  251                         nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
  252                                 ~(NFS_FABLKSIZE - 1);
  253                 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
  254                 if (max < nmp->nm_rsize && max > 0) {
  255                         nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
  256                         if (nmp->nm_rsize == 0)
  257                                 nmp->nm_rsize = max;
  258                 }
  259                 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
  260                 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ)
  261                         nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) &
  262                                 ~(NFS_DIRFRAGSIZ - 1);
  263                 if (max < nmp->nm_readdirsize && max > 0) {
  264                         nmp->nm_readdirsize = max & ~(NFS_DIRFRAGSIZ - 1);
  265                         if (nmp->nm_readdirsize == 0)
  266                                 nmp->nm_readdirsize = max;
  267                 }
  268                 /* XXX */
  269                 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
  270                 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
  271                 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
  272                         nmp->nm_maxfilesize = maxfsize;
  273                 nmp->nm_iflag |= NFSMNT_GOTFSINFO;
  274         }
  275         nfsm_reqdone;
  276         return (error);
  277 }
  278 #endif
  279 
  280 /*
  281  * Mount a remote root fs via. NFS.  It goes like this:
  282  * - Call nfs_boot_init() to fill in the nfs_diskless struct
  283  * - build the rootfs mount point and call mountnfs() to do the rest.
  284  */
  285 int
  286 nfs_mountroot()
  287 {
  288         struct nfs_diskless *nd;
  289         struct vattr attr;
  290         struct mount *mp;
  291         struct vnode *vp;
  292         struct proc *procp;
  293         long n;
  294         int error;
  295 
  296         procp = curproc; /* XXX */
  297 
  298         if (root_device->dv_class != DV_IFNET)
  299                 return (ENODEV);
  300 
  301         /*
  302          * XXX time must be non-zero when we init the interface or else
  303          * the arp code will wedge.  [Fixed now in if_ether.c]
  304          * However, the NFS attribute cache gives false "hits" when
  305          * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now.
  306          */
  307         if (time.tv_sec < NFS_MAXATTRTIMO)
  308                 time.tv_sec = NFS_MAXATTRTIMO;
  309 
  310         /*
  311          * Call nfs_boot_init() to fill in the nfs_diskless struct.
  312          * Side effect:  Finds and configures a network interface.
  313          */
  314         nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK);
  315         memset((caddr_t)nd, 0, sizeof(*nd));
  316         error = nfs_boot_init(nd, procp);
  317         if (error) {
  318                 free(nd, M_NFSMNT);
  319                 return (error);
  320         }
  321 
  322         /*
  323          * Create the root mount point.
  324          */
  325         error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, procp);
  326         if (error)
  327                 goto out;
  328         printf("root on %s\n", nd->nd_root.ndm_host);
  329 
  330         /*
  331          * Link it into the mount list.
  332          */
  333         simple_lock(&mountlist_slock);
  334         CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
  335         simple_unlock(&mountlist_slock);
  336         rootvp = vp;
  337         mp->mnt_vnodecovered = NULLVP;
  338         vfs_unbusy(mp);
  339 
  340         /* Get root attributes (for the time). */
  341         error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp);
  342         if (error)
  343                 panic("nfs_mountroot: getattr for root");
  344         n = attr.va_atime.tv_sec;
  345 #ifdef  DEBUG
  346         printf("root time: 0x%lx\n", n);
  347 #endif
  348         inittodr(n);
  349 
  350 out:
  351         if (error)
  352                 nfs_boot_cleanup(nd, procp);
  353         free(nd, M_NFSMNT);
  354         return (error);
  355 }
  356 
  357 /*
  358  * Internal version of mount system call for diskless setup.
  359  * Separate function because we used to call it twice.
  360  * (once for root and once for swap)
  361  */
  362 static int
  363 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, p)
  364         struct nfs_dlmount *ndmntp;
  365         const char *mntname;    /* mount point name */
  366         struct mount **mpp;
  367         struct vnode **vpp;
  368         struct proc *p;
  369 {
  370         struct mount *mp;
  371         struct mbuf *m;
  372         int error;
  373 
  374         vfs_rootmountalloc(MOUNT_NFS, (char *)mntname, &mp);
  375 
  376         mp->mnt_op = &nfs_vfsops;
  377 
  378         /*
  379          * Historical practice expects NFS root file systems to
  380          * be initially mounted r/w.
  381          */
  382         mp->mnt_flag &= ~MNT_RDONLY;
  383 
  384         /* Get mbuf for server sockaddr. */
  385         m = m_get(M_WAIT, MT_SONAME);
  386         if (m == NULL)
  387                 panic("nfs_mountroot: mget soname for %s", mntname);
  388         MCLAIM(m, &nfs_mowner);
  389         memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr,
  390               (m->m_len = ndmntp->ndm_args.addr->sa_len));
  391 
  392         error = mountnfs(&ndmntp->ndm_args, mp, m, mntname,
  393                          ndmntp->ndm_args.hostname, vpp, p);
  394         if (error) {
  395                 mp->mnt_op->vfs_refcount--;
  396                 vfs_unbusy(mp);
  397                 printf("nfs_mountroot: mount %s failed: %d\n",
  398                        mntname, error);
  399                 free(mp, M_MOUNT);
  400         } else
  401                 *mpp = mp;
  402 
  403         return (error);
  404 }
  405 
  406 void
  407 nfs_decode_args(nmp, argp)
  408         struct nfsmount *nmp;
  409         struct nfs_args *argp;
  410 {
  411         int s;
  412         int adjsock;
  413         int maxio;
  414 
  415         s = splsoftnet();
  416 
  417         /*
  418          * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
  419          * no sense in that context.
  420          */
  421         if (argp->sotype == SOCK_STREAM)
  422                 argp->flags &= ~NFSMNT_NOCONN;
  423 
  424         /*
  425          * Cookie translation is not needed for v2, silently ignore it.
  426          */
  427         if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) ==
  428             NFSMNT_XLATECOOKIE)
  429                 argp->flags &= ~NFSMNT_XLATECOOKIE;
  430 
  431         /* Re-bind if rsrvd port requested and wasn't on one */
  432         adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
  433                   && (argp->flags & NFSMNT_RESVPORT);
  434         /* Also re-bind if we're switching to/from a connected UDP socket */
  435         adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
  436                     (argp->flags & NFSMNT_NOCONN));
  437 
  438         /* Update flags. */
  439         nmp->nm_flag = argp->flags;
  440         splx(s);
  441 
  442         if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
  443                 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
  444                 if (nmp->nm_timeo < NFS_MINTIMEO)
  445                         nmp->nm_timeo = NFS_MINTIMEO;
  446                 else if (nmp->nm_timeo > NFS_MAXTIMEO)
  447                         nmp->nm_timeo = NFS_MAXTIMEO;
  448         }
  449 
  450         if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
  451                 nmp->nm_retry = argp->retrans;
  452                 if (nmp->nm_retry > NFS_MAXREXMIT)
  453                         nmp->nm_retry = NFS_MAXREXMIT;
  454         }
  455 
  456 #ifndef NFS_V2_ONLY
  457         if (argp->flags & NFSMNT_NFSV3) {
  458                 if (argp->sotype == SOCK_DGRAM)
  459                         maxio = NFS_MAXDGRAMDATA;
  460                 else
  461                         maxio = NFS_MAXDATA;
  462         } else
  463 #endif
  464                 maxio = NFS_V2MAXDATA;
  465 
  466         if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
  467                 int osize = nmp->nm_wsize;
  468                 nmp->nm_wsize = argp->wsize;
  469                 /* Round down to multiple of blocksize */
  470                 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
  471                 if (nmp->nm_wsize <= 0)
  472                         nmp->nm_wsize = NFS_FABLKSIZE;
  473                 adjsock |= (nmp->nm_wsize != osize);
  474         }
  475         if (nmp->nm_wsize > maxio)
  476                 nmp->nm_wsize = maxio;
  477         if (nmp->nm_wsize > MAXBSIZE)
  478                 nmp->nm_wsize = MAXBSIZE;
  479 
  480         if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
  481                 int osize = nmp->nm_rsize;
  482                 nmp->nm_rsize = argp->rsize;
  483                 /* Round down to multiple of blocksize */
  484                 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
  485                 if (nmp->nm_rsize <= 0)
  486                         nmp->nm_rsize = NFS_FABLKSIZE;
  487                 adjsock |= (nmp->nm_rsize != osize);
  488         }
  489         if (nmp->nm_rsize > maxio)
  490                 nmp->nm_rsize = maxio;
  491         if (nmp->nm_rsize > MAXBSIZE)
  492                 nmp->nm_rsize = MAXBSIZE;
  493 
  494         if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
  495                 nmp->nm_readdirsize = argp->readdirsize;
  496                 /* Round down to multiple of minimum blocksize */
  497                 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1);
  498                 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ)
  499                         nmp->nm_readdirsize = NFS_DIRFRAGSIZ;
  500                 /* Bigger than buffer size makes no sense */
  501                 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ)
  502                         nmp->nm_readdirsize = NFS_DIRBLKSIZ;
  503         } else if (argp->flags & NFSMNT_RSIZE)
  504                 nmp->nm_readdirsize = nmp->nm_rsize;
  505 
  506         if (nmp->nm_readdirsize > maxio)
  507                 nmp->nm_readdirsize = maxio;
  508 
  509         if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 &&
  510                 argp->maxgrouplist <= NFS_MAXGRPS)
  511                 nmp->nm_numgrps = argp->maxgrouplist;
  512         if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 &&
  513                 argp->readahead <= NFS_MAXRAHEAD)
  514                 nmp->nm_readahead = argp->readahead;
  515         if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 &&
  516                 argp->leaseterm <= NQ_MAXLEASE)
  517                 nmp->nm_leaseterm = argp->leaseterm;
  518         if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 &&
  519                 argp->deadthresh <= NQ_NEVERDEAD)
  520                 nmp->nm_deadthresh = argp->deadthresh;
  521 
  522         adjsock |= ((nmp->nm_sotype != argp->sotype) ||
  523                     (nmp->nm_soproto != argp->proto));
  524         nmp->nm_sotype = argp->sotype;
  525         nmp->nm_soproto = argp->proto;
  526 
  527         if (nmp->nm_so && adjsock) {
  528                 nfs_safedisconnect(nmp);
  529                 if (nmp->nm_sotype == SOCK_DGRAM)
  530                         while (nfs_connect(nmp, (struct nfsreq *)0)) {
  531                                 printf("nfs_args: retrying connect\n");
  532                                 (void) tsleep((caddr_t)&lbolt,
  533                                               PSOCK, "nfscn3", 0);
  534                         }
  535         }
  536 }
  537 
  538 /*
  539  * VFS Operations.
  540  *
  541  * mount system call
  542  * It seems a bit dumb to copyinstr() the host and path here and then
  543  * memcpy() them in mountnfs(), but I wanted to detect errors before
  544  * doing the sockargs() call because sockargs() allocates an mbuf and
  545  * an error after that means that I have to release the mbuf.
  546  */
  547 /* ARGSUSED */
  548 int
  549 nfs_mount(mp, path, data, ndp, p)
  550         struct mount *mp;
  551         const char *path;
  552         void *data;
  553         struct nameidata *ndp;
  554         struct proc *p;
  555 {
  556         int error;
  557         struct nfs_args args;
  558         struct mbuf *nam;
  559         struct nfsmount *nmp = VFSTONFS(mp);
  560         struct sockaddr *sa;
  561         struct vnode *vp;
  562         char *pth, *hst;
  563         size_t len;
  564         u_char *nfh;
  565 
  566         error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args));
  567         if (error)
  568                 return (error);
  569 
  570         if (mp->mnt_flag & MNT_GETARGS) {
  571 
  572                 if (nmp == NULL)
  573                         return (EIO);
  574                 if (args.addr != NULL) {
  575                         sa = mtod(nmp->nm_nam, struct sockaddr *);
  576                         error = copyout(sa, args.addr, sa->sa_len);
  577                         if (error)
  578                                 return (error);
  579                         args.addrlen = sa->sa_len;
  580                 } else
  581                         args.addrlen = 0;
  582 
  583                 args.version = NFS_ARGSVERSION;
  584                 args.sotype = nmp->nm_sotype;
  585                 args.proto = nmp->nm_soproto;
  586                 args.fh = NULL;
  587                 args.fhsize = 0;
  588                 args.flags = nmp->nm_flag;
  589                 args.wsize = nmp->nm_wsize;
  590                 args.rsize = nmp->nm_rsize;
  591                 args.readdirsize = nmp->nm_readdirsize;
  592                 args.timeo = nmp->nm_timeo;
  593                 args.retrans = nmp->nm_retry;
  594                 args.maxgrouplist = nmp->nm_numgrps;
  595                 args.readahead = nmp->nm_readahead;
  596                 args.leaseterm = nmp->nm_leaseterm;
  597                 args.deadthresh = nmp->nm_deadthresh;
  598                 args.hostname = NULL;
  599                 return (copyout(&args, data, sizeof(args)));
  600         }
  601 
  602         if (args.version != NFS_ARGSVERSION)
  603                 return (EPROGMISMATCH);
  604 #ifdef NFS_V2_ONLY
  605         if (args.flags & NFSMNT_NQNFS)
  606                 return (EPROGUNAVAIL);
  607         if (args.flags & NFSMNT_NFSV3)
  608                 return (EPROGMISMATCH);
  609 #endif
  610         if (mp->mnt_flag & MNT_UPDATE) {
  611                 if (nmp == NULL)
  612                         return (EIO);
  613                 /*
  614                  * When doing an update, we can't change from or to
  615                  * v3 and/or nqnfs, or change cookie translation
  616                  */
  617                 args.flags = (args.flags &
  618                     ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) |
  619                     (nmp->nm_flag &
  620                         (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE));
  621                 nfs_decode_args(nmp, &args);
  622                 return (0);
  623         }
  624         if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX)
  625                 return (EINVAL);
  626         MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK);
  627         error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
  628         if (error)
  629                 return (error);
  630         MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK);
  631         error = copyinstr(path, pth, MNAMELEN - 1, &len);
  632         if (error)
  633                 goto free_nfh;
  634         memset(&pth[len], 0, MNAMELEN - len);
  635         MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK);
  636         error = copyinstr(args.hostname, hst, MNAMELEN - 1, &len);
  637         if (error)
  638                 goto free_pth;
  639         memset(&hst[len], 0, MNAMELEN - len);
  640         /* sockargs() call must be after above copyin() calls */
  641         error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME);
  642         if (error)
  643                 goto free_hst;
  644         MCLAIM(nam, &nfs_mowner);
  645         args.fh = nfh;
  646         error = mountnfs(&args, mp, nam, pth, hst, &vp, p);
  647 
  648 free_hst:
  649         FREE(hst, M_TEMP);
  650 free_pth:
  651         FREE(pth, M_TEMP);
  652 free_nfh:
  653         FREE(nfh, M_TEMP);
  654 
  655         return (error);
  656 }
  657 
  658 /*
  659  * Common code for mount and mountroot
  660  */
  661 int
  662 mountnfs(argp, mp, nam, pth, hst, vpp, p)
  663         struct nfs_args *argp;
  664         struct mount *mp;
  665         struct mbuf *nam;
  666         const char *pth, *hst;
  667         struct vnode **vpp;
  668         struct proc *p;
  669 {
  670         struct nfsmount *nmp;
  671         struct nfsnode *np;
  672         int error;
  673         struct vattr *attrs;
  674         struct ucred *cr;
  675 
  676         /* 
  677          * If the number of nfs iothreads to use has never
  678          * been set, create a reasonable number of them.
  679          */
  680 
  681         if (nfs_niothreads < 0) {
  682                 nfs_niothreads = NFS_DEFAULT_NIOTHREADS;
  683                 nfs_getset_niothreads(TRUE);
  684         }
  685         
  686         if (mp->mnt_flag & MNT_UPDATE) {
  687                 nmp = VFSTONFS(mp);
  688                 /* update paths, file handles, etc, here        XXX */
  689                 m_freem(nam);
  690                 return (0);
  691         } else {
  692                 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount),
  693                     M_NFSMNT, M_WAITOK);
  694                 memset((caddr_t)nmp, 0, sizeof (struct nfsmount));
  695                 mp->mnt_data = nmp;
  696                 TAILQ_INIT(&nmp->nm_uidlruhead);
  697                 TAILQ_INIT(&nmp->nm_bufq);
  698                 lockinit(&nmp->nm_writeverflock, PRIBIO, "nfswverf", 0, 0);
  699                 simple_lock_init(&nmp->nm_slock);
  700         }
  701         vfs_getnewfsid(mp);
  702         nmp->nm_mountp = mp;
  703 
  704 #ifndef NFS_V2_ONLY
  705         if (argp->flags & NFSMNT_NQNFS)
  706                 /*
  707                  * We have to set mnt_maxsymlink to a non-zero value so
  708                  * that COMPAT_43 routines will know that we are setting
  709                  * the d_type field in directories (and can zero it for
  710                  * unsuspecting binaries).
  711                  */
  712                 mp->mnt_maxsymlinklen = 1;
  713 #endif
  714 
  715 #ifndef NFS_V2_ONLY
  716         if ((argp->flags & NFSMNT_NFSV3) == 0)
  717 #endif
  718                 /*
  719                  * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo
  720                  * will fill this in.
  721                  */
  722                 nmp->nm_maxfilesize = 0xffffffffLL;
  723 
  724         nmp->nm_timeo = NFS_TIMEO;
  725         nmp->nm_retry = NFS_RETRANS;
  726         nmp->nm_wsize = NFS_WSIZE;
  727         nmp->nm_rsize = NFS_RSIZE;
  728         nmp->nm_readdirsize = NFS_READDIRSIZE;
  729         nmp->nm_numgrps = NFS_MAXGRPS;
  730         nmp->nm_readahead = NFS_DEFRAHEAD;
  731         nmp->nm_leaseterm = NQ_DEFLEASE;
  732         nmp->nm_deadthresh = NQ_DEADTHRESH;
  733         CIRCLEQ_INIT(&nmp->nm_timerhead);
  734         nmp->nm_inprog = NULLVP;
  735 #ifdef COMPAT_09
  736         mp->mnt_stat.f_type = 2;
  737 #else
  738         mp->mnt_stat.f_type = 0;
  739 #endif
  740         error = set_statfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, mp, p);
  741         if (error)
  742                 goto bad;
  743         nmp->nm_nam = nam;
  744 
  745         /* Set up the sockets and per-host congestion */
  746         nmp->nm_sotype = argp->sotype;
  747         nmp->nm_soproto = argp->proto;
  748 
  749         nfs_decode_args(nmp, argp);
  750 
  751         mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
  752         mp->mnt_dev_bshift = DEV_BSHIFT;
  753 
  754         /*
  755          * For Connection based sockets (TCP,...) defer the connect until
  756          * the first request, in case the server is not responding.
  757          */
  758         if (nmp->nm_sotype == SOCK_DGRAM &&
  759                 (error = nfs_connect(nmp, (struct nfsreq *)0)))
  760                 goto bad;
  761 
  762         /*
  763          * This is silly, but it has to be set so that vinifod() works.
  764          * We do not want to do an nfs_statfs() here since we can get
  765          * stuck on a dead server and we are holding a lock on the mount
  766          * point.
  767          */
  768         mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA;
  769         error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np);
  770         if (error)
  771                 goto bad;
  772         *vpp = NFSTOV(np);
  773         MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK);
  774         VOP_GETATTR(*vpp, attrs, p->p_ucred, p);
  775         if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) {
  776                 cr = crget();
  777                 cr->cr_uid = attrs->va_uid;
  778                 cr->cr_gid = attrs->va_gid;
  779                 cr->cr_ngroups = 0;
  780                 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, p, cr);
  781                 crfree(cr);
  782         }
  783         FREE(attrs, M_TEMP);
  784 
  785         /*
  786          * A reference count is needed on the nfsnode representing the
  787          * remote root.  If this object is not persistent, then backward
  788          * traversals of the mount point (i.e. "..") will not work if
  789          * the nfsnode gets flushed out of the cache. Ufs does not have
  790          * this problem, because one can identify root inodes by their
  791          * number == ROOTINO (2). So, just unlock, but no rele.
  792          */
  793 
  794         nmp->nm_vnode = *vpp;
  795         VOP_UNLOCK(*vpp, 0);
  796 
  797         return (0);
  798 bad:
  799         nfs_disconnect(nmp);
  800         free((caddr_t)nmp, M_NFSMNT);
  801         m_freem(nam);
  802         return (error);
  803 }
  804 
  805 /*
  806  * unmount system call
  807  */
  808 int
  809 nfs_unmount(mp, mntflags, p)
  810         struct mount *mp;
  811         int mntflags;
  812         struct proc *p;
  813 {
  814         struct nfsmount *nmp;
  815         struct vnode *vp;
  816         int error, flags = 0;
  817 
  818         if (mntflags & MNT_FORCE)
  819                 flags |= FORCECLOSE;
  820         nmp = VFSTONFS(mp);
  821         /*
  822          * Goes something like this..
  823          * - Check for activity on the root vnode (other than ourselves).
  824          * - Call vflush() to clear out vnodes for this file system,
  825          *   except for the root vnode.
  826          * - Decrement reference on the vnode representing remote root.
  827          * - Close the socket
  828          * - Free up the data structures
  829          */
  830         /*
  831          * We need to decrement the ref. count on the nfsnode representing
  832          * the remote root.  See comment in mountnfs().  The VFS unmount()
  833          * has done vput on this vnode, otherwise we would get deadlock!
  834          */
  835         vp = nmp->nm_vnode;
  836         error = vget(vp, LK_EXCLUSIVE | LK_RETRY);
  837         if (error != 0)
  838                 return error;
  839 
  840         if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) {
  841                 vput(vp);
  842                 return (EBUSY);
  843         }
  844 
  845         /*
  846          * Must handshake with nqnfs_clientd() if it is active.
  847          */
  848         nmp->nm_iflag |= NFSMNT_DISMINPROG;
  849         while (nmp->nm_inprog != NULLVP)
  850                 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0);
  851         error = vflush(mp, vp, flags);
  852         if (error) {
  853                 vput(vp);
  854                 nmp->nm_iflag &= ~NFSMNT_DISMINPROG;
  855                 return (error);
  856         }
  857 
  858         /*
  859          * We are now committed to the unmount; mark the mount structure
  860          * as doomed so that any sleepers kicked awake by nfs_disconnect
  861          * will go away cleanly.
  862          */
  863         nmp->nm_iflag |= NFSMNT_DISMNT;
  864 
  865         /*
  866          * There are two reference counts to get rid of here
  867          * (see comment in mountnfs()).
  868          */
  869         vrele(vp);
  870         vput(vp);
  871         vgone(vp);
  872         nfs_disconnect(nmp);
  873         m_freem(nmp->nm_nam);
  874 
  875         /*
  876          * For NQNFS, let the server daemon free the nfsmount structure.
  877          */
  878         if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0)
  879                 free((caddr_t)nmp, M_NFSMNT);
  880         return (0);
  881 }
  882 
  883 /*
  884  * Return root of a filesystem
  885  */
  886 int
  887 nfs_root(mp, vpp)
  888         struct mount *mp;
  889         struct vnode **vpp;
  890 {
  891         struct vnode *vp;
  892         struct nfsmount *nmp;
  893         int error;
  894 
  895         nmp = VFSTONFS(mp);
  896         vp = nmp->nm_vnode;
  897         error = vget(vp, LK_EXCLUSIVE | LK_RETRY);
  898         if (error != 0)
  899                 return error;
  900         if (vp->v_type == VNON)
  901                 vp->v_type = VDIR;
  902         vp->v_flag = VROOT;
  903         *vpp = vp;
  904         return (0);
  905 }
  906 
  907 extern int syncprt;
  908 
  909 /*
  910  * Flush out the buffer cache
  911  */
  912 /* ARGSUSED */
  913 int
  914 nfs_sync(mp, waitfor, cred, p)
  915         struct mount *mp;
  916         int waitfor;
  917         struct ucred *cred;
  918         struct proc *p;
  919 {
  920         struct vnode *vp;
  921         int error, allerror = 0;
  922 
  923         /*
  924          * Force stale buffer cache information to be flushed.
  925          */
  926 loop:
  927         LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) {
  928                 /*
  929                  * If the vnode that we are about to sync is no longer
  930                  * associated with this mount point, start over.
  931                  */
  932                 if (vp->v_mount != mp)
  933                         goto loop;
  934                 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) ||
  935                     (LIST_EMPTY(&vp->v_dirtyblkhd) &&
  936                      vp->v_uobj.uo_npages == 0))
  937                         continue;
  938                 if (vget(vp, LK_EXCLUSIVE))
  939                         goto loop;
  940                 error = VOP_FSYNC(vp, cred,
  941                     waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p);
  942                 if (error)
  943                         allerror = error;
  944                 vput(vp);
  945         }
  946         return (allerror);
  947 }
  948 
  949 /*
  950  * NFS flat namespace lookup.
  951  * Currently unsupported.
  952  */
  953 /* ARGSUSED */
  954 int
  955 nfs_vget(mp, ino, vpp)
  956         struct mount *mp;
  957         ino_t ino;
  958         struct vnode **vpp;
  959 {
  960 
  961         return (EOPNOTSUPP);
  962 }
  963 
  964 /*
  965  * Do that sysctl thang...
  966  */
  967 static int
  968 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS)
  969 {
  970         int error;
  971 
  972         nfs_getset_niothreads(0);
  973         error = sysctl_lookup(SYSCTLFN_CALL(rnode));
  974         if (error || newp == NULL)
  975                 return (error);
  976         nfs_getset_niothreads(1);
  977 
  978         return (0);
  979 }
  980 
  981 SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup")
  982 {
  983 
  984         sysctl_createv(clog, 0, NULL, NULL,
  985                        CTLFLAG_PERMANENT,
  986                        CTLTYPE_NODE, "vfs", NULL,
  987                        NULL, 0, NULL, 0,
  988                        CTL_VFS, CTL_EOL);
  989         sysctl_createv(clog, 0, NULL, NULL,
  990                        CTLFLAG_PERMANENT,
  991                        CTLTYPE_NODE, "nfs",
  992                        SYSCTL_DESCR("NFS vfs options"),
  993                        NULL, 0, NULL, 0,
  994                        CTL_VFS, 2, CTL_EOL);
  995         /*
  996          * XXX the "2" above could be dynamic, thereby eliminating one
  997          * more instance of the "number to vfs" mapping problem, but
  998          * "2" is the order as taken from sys/mount.h
  999          */
 1000 
 1001         sysctl_createv(clog, 0, NULL, NULL,
 1002                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1003                        CTLTYPE_STRUCT, "nfsstats",
 1004                        SYSCTL_DESCR("NFS operation statistics"),
 1005                        NULL, 0, &nfsstats, sizeof(nfsstats), 
 1006                        CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL);
 1007         sysctl_createv(clog, 0, NULL, NULL,
 1008                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 1009                        CTLTYPE_INT, "iothreads",
 1010                        SYSCTL_DESCR("Number of NFS client processes desired"),
 1011                        sysctl_vfs_nfs_iothreads, 0, &nfs_niothreads, 0,
 1012                        CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL);
 1013 }
 1014 
 1015 /*
 1016  * At this point, this should never happen
 1017  */
 1018 /* ARGSUSED */
 1019 int
 1020 nfs_fhtovp(mp, fhp, vpp)
 1021         struct mount *mp;
 1022         struct fid *fhp;
 1023         struct vnode **vpp;
 1024 {
 1025 
 1026         return (EINVAL);
 1027 }
 1028 
 1029 /* ARGSUSED */
 1030 int
 1031 nfs_checkexp(mp, nam, exflagsp, credanonp)
 1032         struct mount *mp;
 1033         struct mbuf *nam;
 1034         int *exflagsp;
 1035         struct ucred **credanonp;
 1036 {
 1037 
 1038         return (EINVAL);
 1039 }
 1040 
 1041 /*
 1042  * Vnode pointer to File handle, should never happen either
 1043  */
 1044 /* ARGSUSED */
 1045 int
 1046 nfs_vptofh(vp, fhp)
 1047         struct vnode *vp;
 1048         struct fid *fhp;
 1049 {
 1050 
 1051         return (EINVAL);
 1052 }
 1053 
 1054 /*
 1055  * Vfs start routine, a no-op.
 1056  */
 1057 /* ARGSUSED */
 1058 int
 1059 nfs_start(mp, flags, p)
 1060         struct mount *mp;
 1061         int flags;
 1062         struct proc *p;
 1063 {
 1064 
 1065         return (0);
 1066 }
 1067 
 1068 /*
 1069  * Do operations associated with quotas, not supported
 1070  */
 1071 /* ARGSUSED */
 1072 int
 1073 nfs_quotactl(mp, cmd, uid, arg, p)
 1074         struct mount *mp;
 1075         int cmd;
 1076         uid_t uid;
 1077         caddr_t arg;
 1078         struct proc *p;
 1079 {
 1080 
 1081         return (EOPNOTSUPP);
 1082 }

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