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/9.0/sys/fs/nfsclient/nfs_clnode.c 224606 2011-08-02 11:28:42Z rmacklem $");
   37 
   38 #include "opt_kdtrace.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/fcntl.h>
   43 #include <sys/lock.h>
   44 #include <sys/malloc.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/taskqueue.h>
   51 #include <sys/vnode.h>
   52 
   53 #include <vm/uma.h>
   54 
   55 #include <fs/nfs/nfsport.h>
   56 #include <fs/nfsclient/nfsnode.h>
   57 #include <fs/nfsclient/nfsmount.h>
   58 #include <fs/nfsclient/nfs.h>
   59 #include <fs/nfsclient/nfs_kdtrace.h>
   60 
   61 #include <nfs/nfs_lock.h>
   62 
   63 extern struct vop_vector newnfs_vnodeops;
   64 extern struct buf_ops buf_ops_newnfs;
   65 MALLOC_DECLARE(M_NEWNFSREQ);
   66 
   67 uma_zone_t newnfsnode_zone;
   68 
   69 static void     nfs_freesillyrename(void *arg, __unused int pending);
   70 
   71 void
   72 ncl_nhinit(void)
   73 {
   74 
   75         newnfsnode_zone = uma_zcreate("NCLNODE", sizeof(struct nfsnode), NULL,
   76             NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
   77 }
   78 
   79 void
   80 ncl_nhuninit(void)
   81 {
   82         uma_zdestroy(newnfsnode_zone);
   83 }
   84 
   85 /*
   86  * ONLY USED FOR THE ROOT DIRECTORY. nfscl_nget() does the rest. If this
   87  * function is going to be used to get Regular Files, code must be added
   88  * to fill in the "struct nfsv4node".
   89  * Look up a vnode/nfsnode by file handle.
   90  * Callers must check for mount points!!
   91  * In all cases, a pointer to a
   92  * nfsnode structure is returned.
   93  */
   94 int
   95 ncl_nget(struct mount *mntp, u_int8_t *fhp, int fhsize, struct nfsnode **npp,
   96     int lkflags)
   97 {
   98         struct thread *td = curthread;  /* XXX */
   99         struct nfsnode *np;
  100         struct vnode *vp;
  101         struct vnode *nvp;
  102         int error;
  103         u_int hash;
  104         struct nfsmount *nmp;
  105         struct nfsfh *nfhp;
  106 
  107         nmp = VFSTONFS(mntp);
  108         *npp = NULL;
  109 
  110         hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT);
  111 
  112         MALLOC(nfhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
  113             M_NFSFH, M_WAITOK);
  114         bcopy(fhp, &nfhp->nfh_fh[0], fhsize);
  115         nfhp->nfh_len = fhsize;
  116         error = vfs_hash_get(mntp, hash, lkflags,
  117             td, &nvp, newnfs_vncmpf, nfhp);
  118         FREE(nfhp, M_NFSFH);
  119         if (error)
  120                 return (error);
  121         if (nvp != NULL) {
  122                 *npp = VTONFS(nvp);
  123                 return (0);
  124         }
  125 
  126         /*
  127          * Allocate before getnewvnode since doing so afterward
  128          * might cause a bogus v_data pointer to get dereferenced
  129          * elsewhere if zalloc should block.
  130          */
  131         np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO);
  132 
  133         error = getnewvnode("newnfs", mntp, &newnfs_vnodeops, &nvp);
  134         if (error) {
  135                 uma_zfree(newnfsnode_zone, np);
  136                 return (error);
  137         }
  138         vp = nvp;
  139         vp->v_bufobj.bo_ops = &buf_ops_newnfs;
  140         vp->v_data = np;
  141         np->n_vnode = vp;
  142         /* 
  143          * Initialize the mutex even if the vnode is going to be a loser.
  144          * This simplifies the logic in reclaim, which can then unconditionally
  145          * destroy the mutex (in the case of the loser, or if hash_insert
  146          * happened to return an error no special casing is needed).
  147          */
  148         mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
  149         /*
  150          * NFS supports recursive and shared locking.
  151          */
  152         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
  153         VN_LOCK_AREC(vp);
  154         VN_LOCK_ASHARE(vp);
  155         /* 
  156          * Are we getting the root? If so, make sure the vnode flags
  157          * are correct 
  158          */
  159         if ((fhsize == nmp->nm_fhsize) &&
  160             !bcmp(fhp, nmp->nm_fh, fhsize)) {
  161                 if (vp->v_type == VNON)
  162                         vp->v_type = VDIR;
  163                 vp->v_vflag |= VV_ROOT;
  164         }
  165         
  166         MALLOC(np->n_fhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
  167             M_NFSFH, M_WAITOK);
  168         bcopy(fhp, np->n_fhp->nfh_fh, fhsize);
  169         np->n_fhp->nfh_len = fhsize;
  170         error = insmntque(vp, mntp);
  171         if (error != 0) {
  172                 *npp = NULL;
  173                 FREE((caddr_t)np->n_fhp, M_NFSFH);
  174                 mtx_destroy(&np->n_mtx);
  175                 uma_zfree(newnfsnode_zone, np);
  176                 return (error);
  177         }
  178         error = vfs_hash_insert(vp, hash, lkflags, 
  179             td, &nvp, newnfs_vncmpf, np->n_fhp);
  180         if (error)
  181                 return (error);
  182         if (nvp != NULL) {
  183                 *npp = VTONFS(nvp);
  184                 /* vfs_hash_insert() vput()'s the losing vnode */
  185                 return (0);
  186         }
  187         *npp = np;
  188 
  189         return (0);
  190 }
  191 
  192 /*
  193  * Do the vrele(sp->s_dvp) as a separate task in order to avoid a
  194  * deadlock because of a LOR when vrele() locks the directory vnode.
  195  */
  196 static void
  197 nfs_freesillyrename(void *arg, __unused int pending)
  198 {
  199         struct sillyrename *sp;
  200 
  201         sp = arg;
  202         vrele(sp->s_dvp);
  203         free(sp, M_NEWNFSREQ);
  204 }
  205 
  206 int
  207 ncl_inactive(struct vop_inactive_args *ap)
  208 {
  209         struct nfsnode *np;
  210         struct sillyrename *sp;
  211         struct vnode *vp = ap->a_vp;
  212 
  213         np = VTONFS(vp);
  214 
  215         if (NFS_ISV4(vp) && vp->v_type == VREG) {
  216                 /*
  217                  * Since mmap()'d files do I/O after VOP_CLOSE(), the NFSv4
  218                  * Close operations are delayed until now. Any dirty buffers
  219                  * must be flushed before the close, so that the stateid is
  220                  * available for the writes.
  221                  */
  222                 (void) ncl_flush(vp, MNT_WAIT, NULL, ap->a_td, 1, 0);
  223                 (void) nfsrpc_close(vp, 1, ap->a_td);
  224         }
  225 
  226         mtx_lock(&np->n_mtx);
  227         if (vp->v_type != VDIR) {
  228                 sp = np->n_sillyrename;
  229                 np->n_sillyrename = NULL;
  230         } else
  231                 sp = NULL;
  232         if (sp) {
  233                 mtx_unlock(&np->n_mtx);
  234                 (void) ncl_vinvalbuf(vp, 0, ap->a_td, 1);
  235                 /*
  236                  * Remove the silly file that was rename'd earlier
  237                  */
  238                 ncl_removeit(sp, vp);
  239                 crfree(sp->s_cred);
  240                 TASK_INIT(&sp->s_task, 0, nfs_freesillyrename, sp);
  241                 taskqueue_enqueue(taskqueue_thread, &sp->s_task);
  242                 mtx_lock(&np->n_mtx);
  243         }
  244         np->n_flag &= NMODIFIED;
  245         mtx_unlock(&np->n_mtx);
  246         return (0);
  247 }
  248 
  249 /*
  250  * Reclaim an nfsnode so that it can be used for other purposes.
  251  */
  252 int
  253 ncl_reclaim(struct vop_reclaim_args *ap)
  254 {
  255         struct vnode *vp = ap->a_vp;
  256         struct nfsnode *np = VTONFS(vp);
  257         struct nfsdmap *dp, *dp2;
  258 
  259         if (NFS_ISV4(vp) && vp->v_type == VREG)
  260                 /*
  261                  * Since mmap()'d files do I/O after VOP_CLOSE(), the NFSv4
  262                  * Close operations are delayed until ncl_inactive().
  263                  * However, since VOP_INACTIVE() is not guaranteed to be
  264                  * called, we need to do it again here.
  265                  */
  266                 (void) nfsrpc_close(vp, 1, ap->a_td);
  267 
  268         /*
  269          * If the NLM is running, give it a chance to abort pending
  270          * locks.
  271          */
  272         if (nfs_reclaim_p != NULL)
  273                 nfs_reclaim_p(ap);
  274 
  275         /*
  276          * Destroy the vm object and flush associated pages.
  277          */
  278         vnode_destroy_vobject(vp);
  279 
  280         vfs_hash_remove(vp);
  281 
  282         /*
  283          * Call nfscl_reclaimnode() to save attributes in the delegation,
  284          * as required.
  285          */
  286         if (vp->v_type == VREG)
  287                 nfscl_reclaimnode(vp);
  288 
  289         /*
  290          * Free up any directory cookie structures and
  291          * large file handle structures that might be associated with
  292          * this nfs node.
  293          */
  294         if (vp->v_type == VDIR) {
  295                 dp = LIST_FIRST(&np->n_cookies);
  296                 while (dp) {
  297                         dp2 = dp;
  298                         dp = LIST_NEXT(dp, ndm_list);
  299                         FREE((caddr_t)dp2, M_NFSDIROFF);
  300                 }
  301         }
  302         FREE((caddr_t)np->n_fhp, M_NFSFH);
  303         if (np->n_v4 != NULL)
  304                 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
  305         mtx_destroy(&np->n_mtx);
  306         uma_zfree(newnfsnode_zone, vp->v_data);
  307         vp->v_data = NULL;
  308         return (0);
  309 }
  310 
  311 /*
  312  * Invalidate both the access and attribute caches for this vnode.
  313  */
  314 void
  315 ncl_invalcaches(struct vnode *vp)
  316 {
  317         struct nfsnode *np = VTONFS(vp);
  318         int i;
  319 
  320         mtx_lock(&np->n_mtx);
  321         for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
  322                 np->n_accesscache[i].stamp = 0;
  323         KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
  324         np->n_attrstamp = 0;
  325         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  326         mtx_unlock(&np->n_mtx);
  327 }
  328 

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