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/8.1/sys/nfsclient/nfs_node.c 199583 2009-11-20 15:27:52Z jhb $");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/fnv_hash.h>
   41 #include <sys/lock.h>
   42 #include <sys/malloc.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/mount.h>
   45 #include <sys/namei.h>
   46 #include <sys/proc.h>
   47 #include <sys/socket.h>
   48 #include <sys/sysctl.h>
   49 #include <sys/vnode.h>
   50 
   51 #include <vm/uma.h>
   52 
   53 #include <nfs/nfsproto.h>
   54 #include <nfsclient/nfs.h>
   55 #include <nfsclient/nfsnode.h>
   56 #include <nfsclient/nfsmount.h>
   57 
   58 static uma_zone_t nfsnode_zone;
   59 
   60 #define TRUE    1
   61 #define FALSE   0
   62 
   63 void
   64 nfs_nhinit(void)
   65 {
   66 
   67         nfsnode_zone = uma_zcreate("NFSNODE", sizeof(struct nfsnode), NULL,
   68             NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
   69 }
   70 
   71 void
   72 nfs_nhuninit(void)
   73 {
   74         uma_zdestroy(nfsnode_zone);
   75 }
   76 
   77 struct nfs_vncmp {
   78         int     fhsize;
   79         void    *fh;
   80 };
   81 
   82 static int
   83 nfs_vncmpf(struct vnode *vp, void *arg)
   84 {
   85         struct nfs_vncmp *a;
   86         struct nfsnode *np;
   87 
   88         a = arg;
   89         np = VTONFS(vp);
   90         return (bcmp(a->fh, np->n_fhp, a->fhsize));
   91 }
   92 
   93 /*
   94  * Look up a vnode/nfsnode by file handle.
   95  * Callers must check for mount points!!
   96  * In all cases, a pointer to a
   97  * nfsnode structure is returned.
   98  */
   99 int
  100 nfs_nget(struct mount *mntp, nfsfh_t *fhp, int fhsize, struct nfsnode **npp, int flags)
  101 {
  102         struct thread *td = curthread;  /* XXX */
  103         struct nfsnode *np;
  104         struct vnode *vp;
  105         struct vnode *nvp;
  106         int error;
  107         u_int hash;
  108         struct nfsmount *nmp;
  109         struct nfs_vncmp ncmp;
  110 
  111         nmp = VFSTONFS(mntp);
  112         *npp = NULL;
  113 
  114         hash = fnv_32_buf(fhp->fh_bytes, fhsize, FNV1_32_INIT);
  115         ncmp.fhsize = fhsize;
  116         ncmp.fh = fhp;
  117 
  118         error = vfs_hash_get(mntp, hash, flags,
  119             td, &nvp, nfs_vncmpf, &ncmp);
  120         if (error)
  121                 return (error);
  122         if (nvp != NULL) {
  123                 *npp = VTONFS(nvp);
  124                 return (0);
  125         }
  126 
  127         /*
  128          * Allocate before getnewvnode since doing so afterward
  129          * might cause a bogus v_data pointer to get dereferenced
  130          * elsewhere if zalloc should block.
  131          */
  132         np = uma_zalloc(nfsnode_zone, M_WAITOK | M_ZERO);
  133 
  134         error = getnewvnode("nfs", mntp, &nfs_vnodeops, &nvp);
  135         if (error) {
  136                 uma_zfree(nfsnode_zone, np);
  137                 return (error);
  138         }
  139         vp = nvp;
  140         vp->v_bufobj.bo_ops = &buf_ops_nfs;
  141         vp->v_data = np;
  142         np->n_vnode = vp;
  143         /* 
  144          * Initialize the mutex even if the vnode is going to be a loser.
  145          * This simplifies the logic in reclaim, which can then unconditionally
  146          * destroy the mutex (in the case of the loser, or if hash_insert happened
  147          * to return an error no special casing is needed).
  148          */
  149         mtx_init(&np->n_mtx, "NFSnode lock", NULL, MTX_DEF);
  150         /*
  151          * NFS supports recursive and shared locking.
  152          */
  153         VN_LOCK_AREC(vp);
  154         VN_LOCK_ASHARE(vp);
  155         if (fhsize > NFS_SMALLFH) {
  156                 np->n_fhp = malloc(fhsize, M_NFSBIGFH, M_WAITOK);
  157         } else
  158                 np->n_fhp = &np->n_fh;
  159         bcopy((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize);
  160         np->n_fhsize = fhsize;
  161         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
  162         error = insmntque(vp, mntp);
  163         if (error != 0) {
  164                 *npp = NULL;
  165                 if (np->n_fhsize > NFS_SMALLFH) {
  166                         free((caddr_t)np->n_fhp, M_NFSBIGFH);
  167                 }
  168                 mtx_destroy(&np->n_mtx);
  169                 uma_zfree(nfsnode_zone, np);
  170                 return (error);
  171         }
  172         error = vfs_hash_insert(vp, hash, flags, 
  173             td, &nvp, nfs_vncmpf, &ncmp);
  174         if (error)
  175                 return (error);
  176         if (nvp != NULL) {
  177                 *npp = VTONFS(nvp);
  178                 /* vfs_hash_insert() vput()'s the losing vnode */
  179                 return (0);
  180         }
  181         *npp = np;
  182 
  183         return (0);
  184 }
  185 
  186 int
  187 nfs_inactive(struct vop_inactive_args *ap)
  188 {
  189         struct nfsnode *np;
  190         struct sillyrename *sp;
  191         struct thread *td = curthread;  /* XXX */
  192 
  193         np = VTONFS(ap->a_vp);
  194         if (prtactive && vrefcnt(ap->a_vp) != 0)
  195                 vprint("nfs_inactive: pushing active", ap->a_vp);
  196         if (ap->a_vp->v_type != VDIR) {
  197                 sp = np->n_sillyrename;
  198                 np->n_sillyrename = NULL;
  199         } else
  200                 sp = NULL;
  201         if (sp) {
  202                 (void)nfs_vinvalbuf(ap->a_vp, 0, td, 1);
  203                 /*
  204                  * Remove the silly file that was rename'd earlier
  205                  */
  206                 (sp->s_removeit)(sp);
  207                 crfree(sp->s_cred);
  208                 vrele(sp->s_dvp);
  209                 free((caddr_t)sp, M_NFSREQ);
  210         }
  211         np->n_flag &= NMODIFIED;
  212         return (0);
  213 }
  214 
  215 /*
  216  * Reclaim an nfsnode so that it can be used for other purposes.
  217  */
  218 int
  219 nfs_reclaim(struct vop_reclaim_args *ap)
  220 {
  221         struct vnode *vp = ap->a_vp;
  222         struct nfsnode *np = VTONFS(vp);
  223         struct nfsdmap *dp, *dp2;
  224 
  225         if (prtactive && vrefcnt(vp) != 0)
  226                 vprint("nfs_reclaim: pushing active", vp);
  227 
  228         /*
  229          * If the NLM is running, give it a chance to abort pending
  230          * locks.
  231          */
  232         if (nfs_reclaim_p)
  233                 nfs_reclaim_p(ap);
  234 
  235         /*
  236          * Destroy the vm object and flush associated pages.
  237          */
  238         vnode_destroy_vobject(vp);
  239 
  240         vfs_hash_remove(vp);
  241 
  242         /*
  243          * Free up any directory cookie structures and
  244          * large file handle structures that might be associated with
  245          * this nfs node.
  246          */
  247         if (vp->v_type == VDIR) {
  248                 dp = LIST_FIRST(&np->n_cookies);
  249                 while (dp) {
  250                         dp2 = dp;
  251                         dp = LIST_NEXT(dp, ndm_list);
  252                         free((caddr_t)dp2, M_NFSDIROFF);
  253                 }
  254         }
  255         if (np->n_fhsize > NFS_SMALLFH) {
  256                 free((caddr_t)np->n_fhp, M_NFSBIGFH);
  257         }
  258         mtx_destroy(&np->n_mtx);
  259         uma_zfree(nfsnode_zone, vp->v_data);
  260         vp->v_data = NULL;
  261         return (0);
  262 }

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