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/10.3/sys/fs/nfsclient/nfs_clnode.c 292895 2015-12-30 00:04:33Z mckusick $");
   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 const char nfs_vnode_tag[] = "newnfs";
   70 
   71 static void     nfs_freesillyrename(void *arg, __unused int pending);
   72 
   73 void
   74 ncl_nhinit(void)
   75 {
   76 
   77         newnfsnode_zone = uma_zcreate("NCLNODE", sizeof(struct nfsnode), NULL,
   78             NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
   79 }
   80 
   81 void
   82 ncl_nhuninit(void)
   83 {
   84         uma_zdestroy(newnfsnode_zone);
   85 }
   86 
   87 /*
   88  * ONLY USED FOR THE ROOT DIRECTORY. nfscl_nget() does the rest. If this
   89  * function is going to be used to get Regular Files, code must be added
   90  * to fill in the "struct nfsv4node".
   91  * Look up a vnode/nfsnode by file handle.
   92  * Callers must check for mount points!!
   93  * In all cases, a pointer to a
   94  * nfsnode structure is returned.
   95  */
   96 int
   97 ncl_nget(struct mount *mntp, u_int8_t *fhp, int fhsize, struct nfsnode **npp,
   98     int lkflags)
   99 {
  100         struct thread *td = curthread;  /* XXX */
  101         struct nfsnode *np;
  102         struct vnode *vp;
  103         struct vnode *nvp;
  104         int error;
  105         u_int hash;
  106         struct nfsmount *nmp;
  107         struct nfsfh *nfhp;
  108 
  109         nmp = VFSTONFS(mntp);
  110         *npp = NULL;
  111 
  112         hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT);
  113 
  114         MALLOC(nfhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
  115             M_NFSFH, M_WAITOK);
  116         bcopy(fhp, &nfhp->nfh_fh[0], fhsize);
  117         nfhp->nfh_len = fhsize;
  118         error = vfs_hash_get(mntp, hash, lkflags,
  119             td, &nvp, newnfs_vncmpf, nfhp);
  120         FREE(nfhp, M_NFSFH);
  121         if (error)
  122                 return (error);
  123         if (nvp != NULL) {
  124                 *npp = VTONFS(nvp);
  125                 return (0);
  126         }
  127         np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO);
  128 
  129         error = getnewvnode(nfs_vnode_tag, mntp, &newnfs_vnodeops, &nvp);
  130         if (error) {
  131                 uma_zfree(newnfsnode_zone, np);
  132                 return (error);
  133         }
  134         vp = nvp;
  135         KASSERT(vp->v_bufobj.bo_bsize != 0, ("ncl_nget: bo_bsize == 0"));
  136         vp->v_bufobj.bo_ops = &buf_ops_newnfs;
  137         vp->v_data = np;
  138         np->n_vnode = vp;
  139         /* 
  140          * Initialize the mutex even if the vnode is going to be a loser.
  141          * This simplifies the logic in reclaim, which can then unconditionally
  142          * destroy the mutex (in the case of the loser, or if hash_insert
  143          * happened to return an error no special casing is needed).
  144          */
  145         mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
  146         /*
  147          * NFS supports recursive and shared locking.
  148          */
  149         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
  150         VN_LOCK_AREC(vp);
  151         VN_LOCK_ASHARE(vp);
  152         /* 
  153          * Are we getting the root? If so, make sure the vnode flags
  154          * are correct 
  155          */
  156         if ((fhsize == nmp->nm_fhsize) &&
  157             !bcmp(fhp, nmp->nm_fh, fhsize)) {
  158                 if (vp->v_type == VNON)
  159                         vp->v_type = VDIR;
  160                 vp->v_vflag |= VV_ROOT;
  161         }
  162         
  163         MALLOC(np->n_fhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
  164             M_NFSFH, M_WAITOK);
  165         bcopy(fhp, np->n_fhp->nfh_fh, fhsize);
  166         np->n_fhp->nfh_len = fhsize;
  167         error = insmntque(vp, mntp);
  168         if (error != 0) {
  169                 *npp = NULL;
  170                 FREE((caddr_t)np->n_fhp, M_NFSFH);
  171                 mtx_destroy(&np->n_mtx);
  172                 uma_zfree(newnfsnode_zone, np);
  173                 return (error);
  174         }
  175         error = vfs_hash_insert(vp, hash, lkflags, 
  176             td, &nvp, newnfs_vncmpf, np->n_fhp);
  177         if (error)
  178                 return (error);
  179         if (nvp != NULL) {
  180                 *npp = VTONFS(nvp);
  181                 /* vfs_hash_insert() vput()'s the losing vnode */
  182                 return (0);
  183         }
  184         *npp = np;
  185 
  186         return (0);
  187 }
  188 
  189 /*
  190  * Do the vrele(sp->s_dvp) as a separate task in order to avoid a
  191  * deadlock because of a LOR when vrele() locks the directory vnode.
  192  */
  193 static void
  194 nfs_freesillyrename(void *arg, __unused int pending)
  195 {
  196         struct sillyrename *sp;
  197 
  198         sp = arg;
  199         vrele(sp->s_dvp);
  200         free(sp, M_NEWNFSREQ);
  201 }
  202 
  203 int
  204 ncl_inactive(struct vop_inactive_args *ap)
  205 {
  206         struct nfsnode *np;
  207         struct sillyrename *sp;
  208         struct vnode *vp = ap->a_vp;
  209         boolean_t retv;
  210 
  211         np = VTONFS(vp);
  212 
  213         if (NFS_ISV4(vp) && vp->v_type == VREG) {
  214                 /*
  215                  * Since mmap()'d files do I/O after VOP_CLOSE(), the NFSv4
  216                  * Close operations are delayed until now. Any dirty
  217                  * buffers/pages must be flushed before the close, so that the
  218                  * stateid is available for the writes.
  219                  */
  220                 if (vp->v_object != NULL) {
  221                         VM_OBJECT_WLOCK(vp->v_object);
  222                         retv = vm_object_page_clean(vp->v_object, 0, 0,
  223                             OBJPC_SYNC);
  224                         VM_OBJECT_WUNLOCK(vp->v_object);
  225                 } else
  226                         retv = TRUE;
  227                 if (retv == TRUE) {
  228                         (void)ncl_flush(vp, MNT_WAIT, NULL, ap->a_td, 1, 0);
  229                         (void)nfsrpc_close(vp, 1, ap->a_td);
  230                 }
  231         }
  232 
  233         mtx_lock(&np->n_mtx);
  234         if (vp->v_type != VDIR) {
  235                 sp = np->n_sillyrename;
  236                 np->n_sillyrename = NULL;
  237         } else
  238                 sp = NULL;
  239         if (sp) {
  240                 mtx_unlock(&np->n_mtx);
  241                 (void) ncl_vinvalbuf(vp, 0, ap->a_td, 1);
  242                 /*
  243                  * Remove the silly file that was rename'd earlier
  244                  */
  245                 ncl_removeit(sp, vp);
  246                 crfree(sp->s_cred);
  247                 TASK_INIT(&sp->s_task, 0, nfs_freesillyrename, sp);
  248                 taskqueue_enqueue(taskqueue_thread, &sp->s_task);
  249                 mtx_lock(&np->n_mtx);
  250         }
  251         np->n_flag &= NMODIFIED;
  252         mtx_unlock(&np->n_mtx);
  253         return (0);
  254 }
  255 
  256 /*
  257  * Reclaim an nfsnode so that it can be used for other purposes.
  258  */
  259 int
  260 ncl_reclaim(struct vop_reclaim_args *ap)
  261 {
  262         struct vnode *vp = ap->a_vp;
  263         struct nfsnode *np = VTONFS(vp);
  264         struct nfsdmap *dp, *dp2;
  265 
  266         /*
  267          * If the NLM is running, give it a chance to abort pending
  268          * locks.
  269          */
  270         if (nfs_reclaim_p != NULL)
  271                 nfs_reclaim_p(ap);
  272 
  273         /*
  274          * Destroy the vm object and flush associated pages.
  275          */
  276         vnode_destroy_vobject(vp);
  277 
  278         if (NFS_ISV4(vp) && vp->v_type == VREG)
  279                 /*
  280                  * We can now safely close any remaining NFSv4 Opens for
  281                  * this file. Most opens will have already been closed by
  282                  * ncl_inactive(), but there are cases where it is not
  283                  * called, so we need to do it again here.
  284                  */
  285                 (void) nfsrpc_close(vp, 1, ap->a_td);
  286 
  287         vfs_hash_remove(vp);
  288 
  289         /*
  290          * Call nfscl_reclaimnode() to save attributes in the delegation,
  291          * as required.
  292          */
  293         if (vp->v_type == VREG)
  294                 nfscl_reclaimnode(vp);
  295 
  296         /*
  297          * Free up any directory cookie structures and
  298          * large file handle structures that might be associated with
  299          * this nfs node.
  300          */
  301         if (vp->v_type == VDIR) {
  302                 dp = LIST_FIRST(&np->n_cookies);
  303                 while (dp) {
  304                         dp2 = dp;
  305                         dp = LIST_NEXT(dp, ndm_list);
  306                         FREE((caddr_t)dp2, M_NFSDIROFF);
  307                 }
  308         }
  309         if (np->n_writecred != NULL)
  310                 crfree(np->n_writecred);
  311         FREE((caddr_t)np->n_fhp, M_NFSFH);
  312         if (np->n_v4 != NULL)
  313                 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
  314         mtx_destroy(&np->n_mtx);
  315         uma_zfree(newnfsnode_zone, vp->v_data);
  316         vp->v_data = NULL;
  317         return (0);
  318 }
  319 
  320 /*
  321  * Invalidate both the access and attribute caches for this vnode.
  322  */
  323 void
  324 ncl_invalcaches(struct vnode *vp)
  325 {
  326         struct nfsnode *np = VTONFS(vp);
  327         int i;
  328 
  329         mtx_lock(&np->n_mtx);
  330         for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
  331                 np->n_accesscache[i].stamp = 0;
  332         KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
  333         np->n_attrstamp = 0;
  334         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  335         mtx_unlock(&np->n_mtx);
  336 }

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