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/fs/nfsclient/nfs_clnode.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  *      from nfs_node.c 8.6 (Berkeley) 5/22/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/8.1/sys/fs/nfsclient/nfs_clnode.c 207691 2010-05-06 01:08:36Z rmacklem $");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/lock.h>
   41 #include <sys/malloc.h>
   42 #include <sys/mount.h>
   43 #include <sys/namei.h>
   44 #include <sys/proc.h>
   45 #include <sys/socket.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/vnode.h>
   48 
   49 #include <vm/uma.h>
   50 
   51 #include <fs/nfs/nfsport.h>
   52 #include <fs/nfsclient/nfsnode.h>
   53 #include <fs/nfsclient/nfsmount.h>
   54 #include <fs/nfsclient/nfs.h>
   55 
   56 extern struct vop_vector newnfs_vnodeops;
   57 extern struct buf_ops buf_ops_newnfs;
   58 MALLOC_DECLARE(M_NEWNFSREQ);
   59 
   60 uma_zone_t newnfsnode_zone;
   61 vop_reclaim_t   *ncl_reclaim_p = NULL;
   62 
   63 void
   64 ncl_nhinit(void)
   65 {
   66 
   67         newnfsnode_zone = uma_zcreate("NCLNODE", sizeof(struct nfsnode), NULL,
   68             NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
   69 }
   70 
   71 void
   72 ncl_nhuninit(void)
   73 {
   74         uma_zdestroy(newnfsnode_zone);
   75 }
   76 
   77 /*
   78  * ONLY USED FOR THE ROOT DIRECTORY. nfscl_nget() does the rest. If this
   79  * function is going to be used to get Regular Files, code must be added
   80  * to fill in the "struct nfsv4node".
   81  * Look up a vnode/nfsnode by file handle.
   82  * Callers must check for mount points!!
   83  * In all cases, a pointer to a
   84  * nfsnode structure is returned.
   85  */
   86 int
   87 ncl_nget(struct mount *mntp, u_int8_t *fhp, int fhsize, struct nfsnode **npp)
   88 {
   89         struct thread *td = curthread;  /* XXX */
   90         struct nfsnode *np;
   91         struct vnode *vp;
   92         struct vnode *nvp;
   93         int error;
   94         u_int hash;
   95         struct nfsmount *nmp;
   96         struct nfsfh *nfhp;
   97 
   98         nmp = VFSTONFS(mntp);
   99         *npp = NULL;
  100 
  101         hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT);
  102 
  103         MALLOC(nfhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
  104             M_NFSFH, M_WAITOK);
  105         bcopy(fhp, &nfhp->nfh_fh[0], fhsize);
  106         nfhp->nfh_len = fhsize;
  107         error = vfs_hash_get(mntp, hash, LK_EXCLUSIVE,
  108             td, &nvp, newnfs_vncmpf, nfhp);
  109         FREE(nfhp, M_NFSFH);
  110         if (error)
  111                 return (error);
  112         if (nvp != NULL) {
  113                 *npp = VTONFS(nvp);
  114                 return (0);
  115         }
  116 
  117         /*
  118          * Allocate before getnewvnode since doing so afterward
  119          * might cause a bogus v_data pointer to get dereferenced
  120          * elsewhere if zalloc should block.
  121          */
  122         np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO);
  123 
  124         error = getnewvnode("newnfs", mntp, &newnfs_vnodeops, &nvp);
  125         if (error) {
  126                 uma_zfree(newnfsnode_zone, np);
  127                 return (error);
  128         }
  129         vp = nvp;
  130         vp->v_bufobj.bo_ops = &buf_ops_newnfs;
  131         vp->v_data = np;
  132         np->n_vnode = vp;
  133         /* 
  134          * Initialize the mutex even if the vnode is going to be a loser.
  135          * This simplifies the logic in reclaim, which can then unconditionally
  136          * destroy the mutex (in the case of the loser, or if hash_insert
  137          * happened to return an error no special casing is needed).
  138          */
  139         mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
  140         /*
  141          * NFS supports recursive and shared locking.
  142          */
  143         VN_LOCK_AREC(vp);
  144         VN_LOCK_ASHARE(vp);
  145         /* 
  146          * Are we getting the root? If so, make sure the vnode flags
  147          * are correct 
  148          */
  149         if ((fhsize == nmp->nm_fhsize) &&
  150             !bcmp(fhp, nmp->nm_fh, fhsize)) {
  151                 if (vp->v_type == VNON)
  152                         vp->v_type = VDIR;
  153                 vp->v_vflag |= VV_ROOT;
  154         }
  155         
  156         MALLOC(np->n_fhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
  157             M_NFSFH, M_WAITOK);
  158         bcopy(fhp, np->n_fhp->nfh_fh, fhsize);
  159         np->n_fhp->nfh_len = fhsize;
  160         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
  161         error = insmntque(vp, mntp);
  162         if (error != 0) {
  163                 *npp = NULL;
  164                 FREE((caddr_t)np->n_fhp, M_NFSFH);
  165                 mtx_destroy(&np->n_mtx);
  166                 uma_zfree(newnfsnode_zone, np);
  167                 return (error);
  168         }
  169         error = vfs_hash_insert(vp, hash, LK_EXCLUSIVE, 
  170             td, &nvp, newnfs_vncmpf, np->n_fhp);
  171         if (error)
  172                 return (error);
  173         if (nvp != NULL) {
  174                 *npp = VTONFS(nvp);
  175                 /* vfs_hash_insert() vput()'s the losing vnode */
  176                 return (0);
  177         }
  178         *npp = np;
  179 
  180         return (0);
  181 }
  182 
  183 int
  184 ncl_inactive(struct vop_inactive_args *ap)
  185 {
  186         struct nfsnode *np;
  187         struct sillyrename *sp;
  188         struct vnode *vp = ap->a_vp;
  189 
  190         np = VTONFS(vp);
  191         if (prtactive && vrefcnt(vp) != 0)
  192                 vprint("ncl_inactive: pushing active", vp);
  193 
  194         if (NFS_ISV4(vp) && vp->v_type == VREG) {
  195                 /*
  196                  * Since mmap()'d files do I/O after VOP_CLOSE(), the NFSv4
  197                  * Close operations are delayed until now. Any dirty buffers
  198                  * must be flushed before the close, so that the stateid is
  199                  * available for the writes.
  200                  */
  201                 (void) ncl_flush(vp, MNT_WAIT, NULL, ap->a_td, 1, 0);
  202                 (void) nfsrpc_close(vp, 1, ap->a_td);
  203         }
  204 
  205         if (vp->v_type != VDIR) {
  206                 sp = np->n_sillyrename;
  207                 np->n_sillyrename = NULL;
  208         } else
  209                 sp = NULL;
  210         if (sp) {
  211                 (void) ncl_vinvalbuf(vp, 0, ap->a_td, 1);
  212                 /*
  213                  * Remove the silly file that was rename'd earlier
  214                  */
  215                 ncl_removeit(sp, vp);
  216                 crfree(sp->s_cred);
  217                 vrele(sp->s_dvp);
  218                 FREE((caddr_t)sp, M_NEWNFSREQ);
  219         }
  220         np->n_flag &= NMODIFIED;
  221         return (0);
  222 }
  223 
  224 /*
  225  * Reclaim an nfsnode so that it can be used for other purposes.
  226  */
  227 int
  228 ncl_reclaim(struct vop_reclaim_args *ap)
  229 {
  230         struct vnode *vp = ap->a_vp;
  231         struct nfsnode *np = VTONFS(vp);
  232         struct nfsdmap *dp, *dp2;
  233 
  234         if (prtactive && vrefcnt(vp) != 0)
  235                 vprint("ncl_reclaim: pushing active", vp);
  236 
  237         /*
  238          * If the NLM is running, give it a chance to abort pending
  239          * locks.
  240          */
  241         if (ncl_reclaim_p)
  242                 ncl_reclaim_p(ap);
  243 
  244         /*
  245          * Destroy the vm object and flush associated pages.
  246          */
  247         vnode_destroy_vobject(vp);
  248 
  249         vfs_hash_remove(vp);
  250 
  251         /*
  252          * Call nfscl_reclaimnode() to save attributes in the delegation,
  253          * as required.
  254          */
  255         if (vp->v_type == VREG)
  256                 nfscl_reclaimnode(vp);
  257 
  258         /*
  259          * Free up any directory cookie structures and
  260          * large file handle structures that might be associated with
  261          * this nfs node.
  262          */
  263         if (vp->v_type == VDIR) {
  264                 dp = LIST_FIRST(&np->n_cookies);
  265                 while (dp) {
  266                         dp2 = dp;
  267                         dp = LIST_NEXT(dp, ndm_list);
  268                         FREE((caddr_t)dp2, M_NFSDIROFF);
  269                 }
  270         }
  271         FREE((caddr_t)np->n_fhp, M_NFSFH);
  272         if (np->n_v4 != NULL)
  273                 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
  274         mtx_destroy(&np->n_mtx);
  275         uma_zfree(newnfsnode_zone, vp->v_data);
  276         vp->v_data = NULL;
  277         return (0);
  278 }
  279 
  280 /*
  281  * Invalidate both the access and attribute caches for this vnode.
  282  */
  283 void
  284 ncl_invalcaches(struct vnode *vp)
  285 {
  286         struct nfsnode *np = VTONFS(vp);
  287         int i;
  288 
  289         mtx_lock(&np->n_mtx);
  290         for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
  291                 np->n_accesscache[i].stamp = 0;
  292         np->n_attrstamp = 0;
  293         mtx_unlock(&np->n_mtx);
  294 }
  295 

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