nfs_node.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
    1 /*      $NetBSD: nfs_node.c,v 1.79.2.1 2005/08/24 18:43:37 riz 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 1.79.2.1 2005/08/24 18:43:37 riz 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 POOL_INIT(nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl",
   67     &pool_allocator_nointr);
   68 POOL_INIT(nfs_vattr_pool, sizeof(struct vattr), 0, 0, 0, "nfsvapl",
   69     &pool_allocator_nointr);
   70 
   71 MALLOC_DEFINE(M_NFSBIGFH, "NFS bigfh", "NFS big filehandle");
   72 MALLOC_DEFINE(M_NFSNODE, "NFS node", "NFS vnode private part");
   73 
   74 extern int prtactive;
   75 
   76 #define nfs_hash(x,y)   hash32_buf((x), (y), HASH32_BUF_INIT)
   77 
   78 void nfs_gop_size(struct vnode *, off_t, off_t *, int);
   79 int nfs_gop_alloc(struct vnode *, off_t, off_t, int, struct ucred *);
   80 int nfs_gop_write(struct vnode *, struct vm_page **, int, int);
   81 
   82 static const struct genfs_ops nfs_genfsops = {
   83         .gop_size = nfs_gop_size,
   84         .gop_alloc = nfs_gop_alloc,
   85         .gop_write = nfs_gop_write,
   86 };
   87 
   88 /*
   89  * Initialize hash links for nfsnodes
   90  * and build nfsnode free list.
   91  */
   92 void
   93 nfs_nhinit()
   94 {
   95 
   96         nfsnodehashtbl = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE,
   97             M_WAITOK, &nfsnodehash);
   98         lockinit(&nfs_hashlock, PINOD, "nfs_hashlock", 0, 0);
   99 }
  100 
  101 /*
  102  * Reinitialize inode hash table.
  103  */
  104 
  105 void
  106 nfs_nhreinit()
  107 {
  108         struct nfsnode *np;
  109         struct nfsnodehashhead *oldhash, *hash;
  110         u_long oldmask, mask, val;
  111         int i;
  112 
  113         hash = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE, M_WAITOK,
  114             &mask);
  115 
  116         lockmgr(&nfs_hashlock, LK_EXCLUSIVE, NULL);
  117         oldhash = nfsnodehashtbl;
  118         oldmask = nfsnodehash;
  119         nfsnodehashtbl = hash;
  120         nfsnodehash = mask;
  121         for (i = 0; i <= oldmask; i++) {
  122                 while ((np = LIST_FIRST(&oldhash[i])) != NULL) {
  123                         LIST_REMOVE(np, n_hash);
  124                         val = NFSNOHASH(nfs_hash(np->n_fhp, np->n_fhsize));
  125                         LIST_INSERT_HEAD(&hash[val], np, n_hash);
  126                 }
  127         }
  128         lockmgr(&nfs_hashlock, LK_RELEASE, NULL);
  129         hashdone(oldhash, M_NFSNODE);
  130 }
  131 
  132 /*
  133  * Free resources previoslu allocated in nfs_nhinit().
  134  */
  135 void
  136 nfs_nhdone()
  137 {
  138         hashdone(nfsnodehashtbl, M_NFSNODE);
  139         pool_destroy(&nfs_node_pool);
  140         pool_destroy(&nfs_vattr_pool);
  141 }
  142 
  143 /*
  144  * Look up a vnode/nfsnode by file handle.
  145  * Callers must check for mount points!!
  146  * In all cases, a pointer to a
  147  * nfsnode structure is returned.
  148  */
  149 int
  150 nfs_nget1(mntp, fhp, fhsize, npp, lkflags)
  151         struct mount *mntp;
  152         nfsfh_t *fhp;
  153         int fhsize;
  154         struct nfsnode **npp;
  155         int lkflags;
  156 {
  157         struct nfsnode *np;
  158         struct nfsnodehashhead *nhpp;
  159         struct vnode *vp;
  160         int error;
  161 
  162         nhpp = &nfsnodehashtbl[NFSNOHASH(nfs_hash(fhp, fhsize))];
  163 loop:
  164         LIST_FOREACH(np, nhpp, n_hash) {
  165                 if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize ||
  166                     memcmp(fhp, np->n_fhp, fhsize))
  167                         continue;
  168                 vp = NFSTOV(np);
  169                 error = vget(vp, LK_EXCLUSIVE | lkflags);
  170                 if (error == EBUSY)
  171                         return error;
  172                 if (error)
  173                         goto loop;
  174                 *npp = np;
  175                 return(0);
  176         }
  177         if (lockmgr(&nfs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0))
  178                 goto loop;
  179         error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &vp);
  180         if (error) {
  181                 *npp = 0;
  182                 lockmgr(&nfs_hashlock, LK_RELEASE, 0);
  183                 return (error);
  184         }
  185         np = pool_get(&nfs_node_pool, PR_WAITOK);
  186         memset(np, 0, sizeof *np);
  187         vp->v_data = np;
  188         np->n_vnode = vp;
  189         genfs_node_init(vp, &nfs_genfsops);
  190 
  191         /*
  192          * Insert the nfsnode in the hash queue for its new file handle
  193          */
  194 
  195         LIST_INSERT_HEAD(nhpp, np, n_hash);
  196         if (fhsize > NFS_SMALLFH) {
  197                 np->n_fhp = malloc(fhsize, M_NFSBIGFH, M_WAITOK);
  198         } else
  199                 np->n_fhp = &np->n_fh;
  200         memcpy(np->n_fhp, fhp, fhsize);
  201         np->n_fhsize = fhsize;
  202         np->n_accstamp = -1;
  203         np->n_vattr = pool_get(&nfs_vattr_pool, PR_WAITOK);
  204 
  205         /*
  206          * Initalize read/write creds to useful values. VOP_OPEN will
  207          * overwrite these.
  208          */
  209         np->n_rcred = curproc->p_ucred;
  210         crhold(np->n_rcred);
  211         np->n_wcred = curproc->p_ucred;
  212         crhold(np->n_wcred);
  213         lockmgr(&vp->v_lock, LK_EXCLUSIVE, NULL);
  214         lockmgr(&nfs_hashlock, LK_RELEASE, NULL);
  215         NFS_INVALIDATE_ATTRCACHE(np);
  216         uvm_vnp_setsize(vp, 0);
  217         *npp = np;
  218         return (0);
  219 }
  220 
  221 int
  222 nfs_inactive(v)
  223         void *v;
  224 {
  225         struct vop_inactive_args /* {
  226                 struct vnode *a_vp;
  227                 struct proc *a_p;
  228         } */ *ap = v;
  229         struct nfsnode *np;
  230         struct sillyrename *sp;
  231         struct proc *p = ap->a_p;
  232         struct vnode *vp = ap->a_vp;
  233         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
  234         boolean_t removed;
  235         int err;
  236 
  237         np = VTONFS(vp);
  238         if (prtactive && vp->v_usecount != 0)
  239                 vprint("nfs_inactive: pushing active", vp);
  240         if (vp->v_type != VDIR) {
  241                 sp = np->n_sillyrename;
  242                 np->n_sillyrename = (struct sillyrename *)0;
  243         } else
  244                 sp = NULL;
  245         if (sp != NULL)
  246                 nfs_vinvalbuf(vp, 0, sp->s_cred, p, 1);
  247         removed = (np->n_flag & NREMOVED) != 0;
  248         np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED |
  249                 NQNFSNONCACHE | NQNFSWRITE | NEOFVALID);
  250 
  251         if ((nmp->nm_flag & NFSMNT_NQNFS) && CIRCLEQ_NEXT(np, n_timer) != 0) {
  252                 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer);
  253         }
  254 
  255         if (vp->v_type == VDIR && np->n_dircache)
  256                 nfs_invaldircache(vp,
  257                     NFS_INVALDIRCACHE_FORCE | NFS_INVALDIRCACHE_KEEPEOF);
  258 
  259         VOP_UNLOCK(vp, 0);
  260 
  261         /* XXXMP only kernel_lock protects vp */
  262         if (removed)
  263                 vrecycle(vp, NULL, p);
  264 
  265         if (sp != NULL) {
  266 
  267                 /*
  268                  * Remove the silly file that was rename'd earlier
  269                  *
  270                  * Just in case our thread also has the parent node locked,
  271                  * we let vn_lock() fail.
  272                  */
  273 
  274                 err = vn_lock(sp->s_dvp, LK_EXCLUSIVE | LK_RETRY
  275                                         | LK_RECURSEFAIL);
  276                 nfs_removeit(sp);
  277                 crfree(sp->s_cred);
  278                 if (err != EDEADLK)
  279                         vput(sp->s_dvp);
  280                 else
  281                         vrele(sp->s_dvp);
  282                 FREE(sp, M_NFSREQ);
  283         }
  284 
  285         return (0);
  286 }
  287 
  288 /*
  289  * Reclaim an nfsnode so that it can be used for other purposes.
  290  */
  291 int
  292 nfs_reclaim(v)
  293         void *v;
  294 {
  295         struct vop_reclaim_args /* {
  296                 struct vnode *a_vp;
  297         } */ *ap = v;
  298         struct vnode *vp = ap->a_vp;
  299         struct nfsnode *np = VTONFS(vp);
  300 
  301         if (prtactive && vp->v_usecount != 0)
  302                 vprint("nfs_reclaim: pushing active", vp);
  303 
  304         LIST_REMOVE(np, n_hash);
  305 
  306         /*
  307          * Free up any directory cookie structures and
  308          * large file handle structures that might be associated with
  309          * this nfs node.
  310          */
  311         if (vp->v_type == VDIR && np->n_dircache)
  312                 hashdone(np->n_dircache, M_NFSDIROFF);
  313         KASSERT(np->n_dirgens == NULL);
  314 
  315         if (np->n_fhsize > NFS_SMALLFH)
  316                 free(np->n_fhp, M_NFSBIGFH);
  317 
  318         pool_put(&nfs_vattr_pool, np->n_vattr);
  319         if (np->n_rcred)
  320                 crfree(np->n_rcred);
  321 
  322         if (np->n_wcred)
  323                 crfree(np->n_wcred);
  324 
  325         cache_purge(vp);
  326         pool_put(&nfs_node_pool, vp->v_data);
  327         vp->v_data = NULL;
  328         return (0);
  329 }
  330 
  331 void
  332 nfs_gop_size(struct vnode *vp, off_t size, off_t *eobp, int flags)
  333 {
  334         KASSERT(flags & (GOP_SIZE_READ | GOP_SIZE_WRITE));
  335         KASSERT((flags & (GOP_SIZE_READ | GOP_SIZE_WRITE))
  336                 != (GOP_SIZE_READ | GOP_SIZE_WRITE));
  337         *eobp = MAX(size, vp->v_size);
  338 }
  339 
  340 int
  341 nfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
  342     struct ucred *cred)
  343 {
  344         return 0;
  345 }
  346 
  347 int
  348 nfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, int flags)
  349 {
  350         int i;
  351 
  352         for (i = 0; i < npages; i++) {
  353                 pmap_page_protect(pgs[i], VM_PROT_READ);
  354         }
  355         return genfs_gop_write(vp, pgs, npages, flags);
  356 }
Cache object: 11355505b391fdb0eb5f6bb572e1848f
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/nfs/nfs_node.c

FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_node.c
