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_node.c

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    1 /*-
    2  * Copyright (c) 1989, 1993
    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_node.c  8.6 (Berkeley) 5/22/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/8.2/sys/nfsclient/nfs_node.c 215860 2010-11-26 11:37:35Z kib $");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/fcntl.h>
   41 #include <sys/fnv_hash.h>
   42 #include <sys/lock.h>
   43 #include <sys/malloc.h>
   44 #include <sys/mbuf.h>
   45 #include <sys/mount.h>
   46 #include <sys/namei.h>
   47 #include <sys/proc.h>
   48 #include <sys/socket.h>
   49 #include <sys/sysctl.h>
   50 #include <sys/vnode.h>
   51 
   52 #include <vm/uma.h>
   53 
   54 #include <nfs/nfsproto.h>
   55 #include <nfs/nfs_lock.h>
   56 #include <nfsclient/nfs.h>
   57 #include <nfsclient/nfsnode.h>
   58 #include <nfsclient/nfsmount.h>
   59 
   60 static uma_zone_t nfsnode_zone;
   61 
   62 #define TRUE    1
   63 #define FALSE   0
   64 
   65 void
   66 nfs_nhinit(void)
   67 {
   68 
   69         nfsnode_zone = uma_zcreate("NFSNODE", sizeof(struct nfsnode), NULL,
   70             NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
   71 }
   72 
   73 void
   74 nfs_nhuninit(void)
   75 {
   76         uma_zdestroy(nfsnode_zone);
   77 }
   78 
   79 struct nfs_vncmp {
   80         int     fhsize;
   81         void    *fh;
   82 };
   83 
   84 static int
   85 nfs_vncmpf(struct vnode *vp, void *arg)
   86 {
   87         struct nfs_vncmp *a;
   88         struct nfsnode *np;
   89 
   90         a = arg;
   91         np = VTONFS(vp);
   92         return (bcmp(a->fh, np->n_fhp, a->fhsize));
   93 }
   94 
   95 /*
   96  * Look up a vnode/nfsnode by file handle.
   97  * Callers must check for mount points!!
   98  * In all cases, a pointer to a
   99  * nfsnode structure is returned.
  100  */
  101 int
  102 nfs_nget(struct mount *mntp, nfsfh_t *fhp, int fhsize, struct nfsnode **npp, int flags)
  103 {
  104         struct thread *td = curthread;  /* XXX */
  105         struct nfsnode *np;
  106         struct vnode *vp;
  107         struct vnode *nvp;
  108         int error;
  109         u_int hash;
  110         struct nfsmount *nmp;
  111         struct nfs_vncmp ncmp;
  112 
  113         nmp = VFSTONFS(mntp);
  114         *npp = NULL;
  115 
  116         hash = fnv_32_buf(fhp->fh_bytes, fhsize, FNV1_32_INIT);
  117         ncmp.fhsize = fhsize;
  118         ncmp.fh = fhp;
  119 
  120         error = vfs_hash_get(mntp, hash, flags,
  121             td, &nvp, nfs_vncmpf, &ncmp);
  122         if (error)
  123                 return (error);
  124         if (nvp != NULL) {
  125                 *npp = VTONFS(nvp);
  126                 return (0);
  127         }
  128 
  129         /*
  130          * Allocate before getnewvnode since doing so afterward
  131          * might cause a bogus v_data pointer to get dereferenced
  132          * elsewhere if zalloc should block.
  133          */
  134         np = uma_zalloc(nfsnode_zone, M_WAITOK | M_ZERO);
  135 
  136         error = getnewvnode("nfs", mntp, &nfs_vnodeops, &nvp);
  137         if (error) {
  138                 uma_zfree(nfsnode_zone, np);
  139                 return (error);
  140         }
  141         vp = nvp;
  142         vp->v_bufobj.bo_ops = &buf_ops_nfs;
  143         vp->v_data = np;
  144         np->n_vnode = vp;
  145         /* 
  146          * Initialize the mutex even if the vnode is going to be a loser.
  147          * This simplifies the logic in reclaim, which can then unconditionally
  148          * destroy the mutex (in the case of the loser, or if hash_insert happened
  149          * to return an error no special casing is needed).
  150          */
  151         mtx_init(&np->n_mtx, "NFSnode lock", NULL, MTX_DEF);
  152         /*
  153          * NFS supports recursive and shared locking.
  154          */
  155         VN_LOCK_AREC(vp);
  156         VN_LOCK_ASHARE(vp);
  157         if (fhsize > NFS_SMALLFH) {
  158                 np->n_fhp = malloc(fhsize, M_NFSBIGFH, M_WAITOK);
  159         } else
  160                 np->n_fhp = &np->n_fh;
  161         bcopy((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize);
  162         np->n_fhsize = fhsize;
  163         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
  164         error = insmntque(vp, mntp);
  165         if (error != 0) {
  166                 *npp = NULL;
  167                 if (np->n_fhsize > NFS_SMALLFH) {
  168                         free((caddr_t)np->n_fhp, M_NFSBIGFH);
  169                 }
  170                 mtx_destroy(&np->n_mtx);
  171                 uma_zfree(nfsnode_zone, np);
  172                 return (error);
  173         }
  174         error = vfs_hash_insert(vp, hash, flags, 
  175             td, &nvp, nfs_vncmpf, &ncmp);
  176         if (error)
  177                 return (error);
  178         if (nvp != NULL) {
  179                 *npp = VTONFS(nvp);
  180                 /* vfs_hash_insert() vput()'s the losing vnode */
  181                 return (0);
  182         }
  183         *npp = np;
  184 
  185         return (0);
  186 }
  187 
  188 int
  189 nfs_inactive(struct vop_inactive_args *ap)
  190 {
  191         struct nfsnode *np;
  192         struct sillyrename *sp;
  193         struct thread *td = curthread;  /* XXX */
  194 
  195         np = VTONFS(ap->a_vp);
  196         mtx_lock(&np->n_mtx);
  197         if (ap->a_vp->v_type != VDIR) {
  198                 sp = np->n_sillyrename;
  199                 np->n_sillyrename = NULL;
  200         } else
  201                 sp = NULL;
  202         if (sp) {
  203                 mtx_unlock(&np->n_mtx);
  204                 (void)nfs_vinvalbuf(ap->a_vp, 0, td, 1);
  205                 /*
  206                  * Remove the silly file that was rename'd earlier
  207                  */
  208                 (sp->s_removeit)(sp);
  209                 crfree(sp->s_cred);
  210                 vrele(sp->s_dvp);
  211                 free((caddr_t)sp, M_NFSREQ);
  212                 mtx_lock(&np->n_mtx);
  213         }
  214         np->n_flag &= NMODIFIED;
  215         mtx_unlock(&np->n_mtx);
  216         return (0);
  217 }
  218 
  219 /*
  220  * Reclaim an nfsnode so that it can be used for other purposes.
  221  */
  222 int
  223 nfs_reclaim(struct vop_reclaim_args *ap)
  224 {
  225         struct vnode *vp = ap->a_vp;
  226         struct nfsnode *np = VTONFS(vp);
  227         struct nfsdmap *dp, *dp2;
  228 
  229         /*
  230          * If the NLM is running, give it a chance to abort pending
  231          * locks.
  232          */
  233         if (nfs_reclaim_p)
  234                 nfs_reclaim_p(ap);
  235 
  236         /*
  237          * Destroy the vm object and flush associated pages.
  238          */
  239         vnode_destroy_vobject(vp);
  240 
  241         vfs_hash_remove(vp);
  242 
  243         /*
  244          * Free up any directory cookie structures and
  245          * large file handle structures that might be associated with
  246          * this nfs node.
  247          */
  248         if (vp->v_type == VDIR) {
  249                 dp = LIST_FIRST(&np->n_cookies);
  250                 while (dp) {
  251                         dp2 = dp;
  252                         dp = LIST_NEXT(dp, ndm_list);
  253                         free((caddr_t)dp2, M_NFSDIROFF);
  254                 }
  255         }
  256         if (np->n_fhsize > NFS_SMALLFH) {
  257                 free((caddr_t)np->n_fhp, M_NFSBIGFH);
  258         }
  259         mtx_destroy(&np->n_mtx);
  260         uma_zfree(nfsnode_zone, vp->v_data);
  261         vp->v_data = NULL;
  262         return (0);
  263 }

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