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/nfs/nfs_node.c

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    1 /*      $NetBSD: nfs_node.c,v 1.73.2.2 2004/07/10 14:31:41 tron Exp $   */
    2 
    3 /*
    4  * Copyright (c) 1989, 1993
    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_node.c  8.6 (Berkeley) 5/22/95
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __KERNEL_RCSID(0, "$NetBSD: nfs_node.c,v 1.73.2.2 2004/07/10 14:31:41 tron Exp $");
   39 
   40 #include "opt_nfs.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/proc.h>
   45 #include <sys/mount.h>
   46 #include <sys/namei.h>
   47 #include <sys/vnode.h>
   48 #include <sys/kernel.h>
   49 #include <sys/malloc.h>
   50 #include <sys/pool.h>
   51 #include <sys/lock.h>
   52 #include <sys/hash.h>
   53 
   54 #include <nfs/rpcv2.h>
   55 #include <nfs/nfsproto.h>
   56 #include <nfs/nfs.h>
   57 #include <nfs/nfsnode.h>
   58 #include <nfs/nfsmount.h>
   59 #include <nfs/nqnfs.h>
   60 #include <nfs/nfs_var.h>
   61 
   62 struct nfsnodehashhead *nfsnodehashtbl;
   63 u_long nfsnodehash;
   64 struct lock nfs_hashlock;
   65 
   66 struct pool nfs_node_pool;              /* memory pool for nfs nodes */
   67 struct pool nfs_vattr_pool;             /* memory pool for nfs vattrs */
   68 
   69 MALLOC_DEFINE(M_NFSBIGFH, "NFS bigfh", "NFS big filehandle");
   70 MALLOC_DEFINE(M_NFSNODE, "NFS node", "NFS vnode private part");
   71 
   72 extern int prtactive;
   73 
   74 #define nfs_hash(x,y)   hash32_buf((x), (y), HASH32_BUF_INIT)
   75 
   76 void nfs_gop_size(struct vnode *, off_t, off_t *, int);
   77 int nfs_gop_alloc(struct vnode *, off_t, off_t, int, struct ucred *);
   78 int nfs_gop_write(struct vnode *, struct vm_page **, int, int);
   79 
   80 struct genfs_ops nfs_genfsops = {
   81         nfs_gop_size,
   82         nfs_gop_alloc,
   83         nfs_gop_write,
   84 };
   85 
   86 /*
   87  * Initialize hash links for nfsnodes
   88  * and build nfsnode free list.
   89  */
   90 void
   91 nfs_nhinit()
   92 {
   93 
   94         nfsnodehashtbl = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE,
   95             M_WAITOK, &nfsnodehash);
   96         lockinit(&nfs_hashlock, PINOD, "nfs_hashlock", 0, 0);
   97 
   98         pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl",
   99             &pool_allocator_nointr);
  100         pool_init(&nfs_vattr_pool, sizeof(struct vattr), 0, 0, 0, "nfsvapl",
  101             &pool_allocator_nointr);
  102 }
  103 
  104 /*
  105  * Reinitialize inode hash table.
  106  */
  107 
  108 void
  109 nfs_nhreinit()
  110 {
  111         struct nfsnode *np;
  112         struct nfsnodehashhead *oldhash, *hash;
  113         u_long oldmask, mask, val;
  114         int i;
  115 
  116         hash = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE, M_WAITOK,
  117             &mask);
  118         
  119         lockmgr(&nfs_hashlock, LK_EXCLUSIVE, NULL);
  120         oldhash = nfsnodehashtbl;
  121         oldmask = nfsnodehash;
  122         nfsnodehashtbl = hash;
  123         nfsnodehash = mask;
  124         for (i = 0; i <= oldmask; i++) {
  125                 while ((np = LIST_FIRST(&oldhash[i])) != NULL) {
  126                         LIST_REMOVE(np, n_hash);
  127                         val = NFSNOHASH(nfs_hash(np->n_fhp, np->n_fhsize));
  128                         LIST_INSERT_HEAD(&hash[val], np, n_hash);
  129                 }
  130         }
  131         lockmgr(&nfs_hashlock, LK_RELEASE, NULL);
  132         hashdone(oldhash, M_NFSNODE);
  133 }
  134 
  135 /*
  136  * Free resources previoslu allocated in nfs_nhinit().
  137  */
  138 void
  139 nfs_nhdone()
  140 {
  141         hashdone(nfsnodehashtbl, M_NFSNODE);
  142         pool_destroy(&nfs_node_pool);
  143         pool_destroy(&nfs_vattr_pool);
  144 }
  145 
  146 /*
  147  * Look up a vnode/nfsnode by file handle.
  148  * Callers must check for mount points!!
  149  * In all cases, a pointer to a
  150  * nfsnode structure is returned.
  151  */
  152 int
  153 nfs_nget1(mntp, fhp, fhsize, npp, lkflags)
  154         struct mount *mntp;
  155         nfsfh_t *fhp;
  156         int fhsize;
  157         struct nfsnode **npp;
  158         int lkflags;
  159 {
  160         struct nfsnode *np;
  161         struct nfsnodehashhead *nhpp;
  162         struct vnode *vp;
  163         int error;
  164 
  165         nhpp = &nfsnodehashtbl[NFSNOHASH(nfs_hash(fhp, fhsize))];
  166 loop:
  167         LIST_FOREACH(np, nhpp, n_hash) {
  168                 if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize ||
  169                     memcmp(fhp, np->n_fhp, fhsize))
  170                         continue;
  171                 vp = NFSTOV(np);
  172                 error = vget(vp, LK_EXCLUSIVE | lkflags);
  173                 if (error == EBUSY)
  174                         return error;
  175                 if (error)
  176                         goto loop;
  177                 *npp = np;
  178                 return(0);
  179         }
  180         if (lockmgr(&nfs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0))
  181                 goto loop;
  182         error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &vp);
  183         if (error) {
  184                 *npp = 0;
  185                 lockmgr(&nfs_hashlock, LK_RELEASE, 0);
  186                 return (error);
  187         }
  188         np = pool_get(&nfs_node_pool, PR_WAITOK);
  189         memset(np, 0, sizeof *np);
  190         vp->v_data = np;
  191         np->n_vnode = vp;
  192         genfs_node_init(vp, &nfs_genfsops);
  193 
  194         /*
  195          * Insert the nfsnode in the hash queue for its new file handle
  196          */
  197 
  198         LIST_INSERT_HEAD(nhpp, np, n_hash);
  199         if (fhsize > NFS_SMALLFH) {
  200                 np->n_fhp = malloc(fhsize, M_NFSBIGFH, M_WAITOK);
  201         } else
  202                 np->n_fhp = &np->n_fh;
  203         memcpy(np->n_fhp, fhp, fhsize);
  204         np->n_fhsize = fhsize;
  205         np->n_accstamp = -1;
  206         np->n_vattr = pool_get(&nfs_vattr_pool, PR_WAITOK);
  207 
  208         /*
  209          * Initalize read/write creds to useful values. VOP_OPEN will
  210          * overwrite these.
  211          */
  212         np->n_rcred = curproc->p_ucred;
  213         crhold(np->n_rcred);
  214         np->n_wcred = curproc->p_ucred;
  215         crhold(np->n_wcred);
  216         lockmgr(&vp->v_lock, LK_EXCLUSIVE, NULL);
  217         lockmgr(&nfs_hashlock, LK_RELEASE, NULL);
  218         NFS_INVALIDATE_ATTRCACHE(np);
  219         uvm_vnp_setsize(vp, 0);
  220         *npp = np;
  221         return (0);
  222 }
  223 
  224 int
  225 nfs_inactive(v)
  226         void *v;
  227 {
  228         struct vop_inactive_args /* {
  229                 struct vnode *a_vp;
  230                 struct proc *a_p;
  231         } */ *ap = v;
  232         struct nfsnode *np;
  233         struct sillyrename *sp;
  234         struct proc *p = ap->a_p;
  235         struct vnode *vp = ap->a_vp;
  236         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
  237         boolean_t removed;
  238         int err;
  239 
  240         np = VTONFS(vp);
  241         if (prtactive && vp->v_usecount != 0)
  242                 vprint("nfs_inactive: pushing active", vp);
  243         if (vp->v_type != VDIR) {
  244                 sp = np->n_sillyrename;
  245                 np->n_sillyrename = (struct sillyrename *)0;
  246         } else
  247                 sp = NULL;
  248         if (sp != NULL)
  249                 nfs_vinvalbuf(vp, 0, sp->s_cred, p, 1);
  250         removed = (np->n_flag & NREMOVED) != 0;
  251         np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED |
  252                 NQNFSNONCACHE | NQNFSWRITE);
  253         VOP_UNLOCK(vp, 0);
  254         if (sp != NULL) {
  255 
  256                 /*
  257                  * Remove the silly file that was rename'd earlier
  258                  *
  259                  * Just in case our thread also has the parent node locked,
  260                  * we let vn_lock() fail.
  261                  */
  262 
  263                 err = vn_lock(sp->s_dvp, LK_EXCLUSIVE | LK_RETRY
  264                                         | LK_RECURSEFAIL);
  265                 nfs_removeit(sp);
  266                 crfree(sp->s_cred);
  267                 if (err != EDEADLK)
  268                         vput(sp->s_dvp);
  269                 else
  270                         vrele(sp->s_dvp);
  271                 FREE(sp, M_NFSREQ);
  272         }
  273 
  274         if ((nmp->nm_flag & NFSMNT_NQNFS) && CIRCLEQ_NEXT(np, n_timer) != 0) {
  275                 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer);
  276         }
  277 
  278         if (vp->v_type == VDIR && np->n_dircache)
  279                 nfs_invaldircache(vp, 1);
  280 
  281         if (removed)
  282                 vrecycle(vp, NULL, p);
  283 
  284         return (0);
  285 }
  286 
  287 /*
  288  * Reclaim an nfsnode so that it can be used for other purposes.
  289  */
  290 int
  291 nfs_reclaim(v)
  292         void *v;
  293 {
  294         struct vop_reclaim_args /* {
  295                 struct vnode *a_vp;
  296         } */ *ap = v;
  297         struct vnode *vp = ap->a_vp;
  298         struct nfsnode *np = VTONFS(vp);
  299 
  300         if (prtactive && vp->v_usecount != 0)
  301                 vprint("nfs_reclaim: pushing active", vp);
  302 
  303         LIST_REMOVE(np, n_hash);
  304 
  305         /*
  306          * Free up any directory cookie structures and
  307          * large file handle structures that might be associated with
  308          * this nfs node.
  309          */
  310         if (vp->v_type == VDIR && np->n_dircache)
  311                 hashdone(np->n_dircache, M_NFSDIROFF);
  312         KASSERT(np->n_dirgens == NULL);
  313 
  314         if (np->n_fhsize > NFS_SMALLFH)
  315                 free(np->n_fhp, M_NFSBIGFH);
  316 
  317         pool_put(&nfs_vattr_pool, np->n_vattr);
  318         if (np->n_rcred)
  319                 crfree(np->n_rcred);
  320 
  321         if (np->n_wcred)
  322                 crfree(np->n_wcred);
  323 
  324         cache_purge(vp);
  325         pool_put(&nfs_node_pool, vp->v_data);
  326         vp->v_data = NULL;
  327         return (0);
  328 }
  329 
  330 void
  331 nfs_gop_size(struct vnode *vp, off_t size, off_t *eobp, int flags)
  332 {
  333         KASSERT(flags & (GOP_SIZE_READ | GOP_SIZE_WRITE));
  334         KASSERT((flags & (GOP_SIZE_READ | GOP_SIZE_WRITE))
  335                 != (GOP_SIZE_READ | GOP_SIZE_WRITE));
  336         *eobp = MAX(size, vp->v_size);
  337 }
  338 
  339 int
  340 nfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
  341     struct ucred *cred)
  342 {
  343         return 0;
  344 }
  345 
  346 int
  347 nfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, int flags)
  348 {
  349         int i;
  350 
  351         for (i = 0; i < npages; i++) {
  352                 pmap_page_protect(pgs[i], VM_PROT_READ);
  353         }
  354         return genfs_gop_write(vp, pgs, npages, flags);
  355 }

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