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: stable/9/sys/fs/nfsclient/nfs_clnode.c 237543 2012-06-25 01:48:18Z 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         KASSERT(vp->v_bufobj.bo_bsize != 0, ("ncl_nget: bo_bsize == 0"));
  140         vp->v_bufobj.bo_ops = &buf_ops_newnfs;
  141         vp->v_data = np;
  142         np->n_vnode = vp;
  143         /* 
  144          * Initialize the mutex even if the vnode is going to be a loser.
  145          * This simplifies the logic in reclaim, which can then unconditionally
  146          * destroy the mutex (in the case of the loser, or if hash_insert
  147          * happened to return an error no special casing is needed).
  148          */
  149         mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
  150         /*
  151          * NFS supports recursive and shared locking.
  152          */
  153         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
  154         VN_LOCK_AREC(vp);
  155         VN_LOCK_ASHARE(vp);
  156         /* 
  157          * Are we getting the root? If so, make sure the vnode flags
  158          * are correct 
  159          */
  160         if ((fhsize == nmp->nm_fhsize) &&
  161             !bcmp(fhp, nmp->nm_fh, fhsize)) {
  162                 if (vp->v_type == VNON)
  163                         vp->v_type = VDIR;
  164                 vp->v_vflag |= VV_ROOT;
  165         }
  166         
  167         MALLOC(np->n_fhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
  168             M_NFSFH, M_WAITOK);
  169         bcopy(fhp, np->n_fhp->nfh_fh, fhsize);
  170         np->n_fhp->nfh_len = fhsize;
  171         error = insmntque(vp, mntp);
  172         if (error != 0) {
  173                 *npp = NULL;
  174                 FREE((caddr_t)np->n_fhp, M_NFSFH);
  175                 mtx_destroy(&np->n_mtx);
  176                 uma_zfree(newnfsnode_zone, np);
  177                 return (error);
  178         }
  179         error = vfs_hash_insert(vp, hash, lkflags, 
  180             td, &nvp, newnfs_vncmpf, np->n_fhp);
  181         if (error)
  182                 return (error);
  183         if (nvp != NULL) {
  184                 *npp = VTONFS(nvp);
  185                 /* vfs_hash_insert() vput()'s the losing vnode */
  186                 return (0);
  187         }
  188         *npp = np;
  189 
  190         return (0);
  191 }
  192 
  193 /*
  194  * Do the vrele(sp->s_dvp) as a separate task in order to avoid a
  195  * deadlock because of a LOR when vrele() locks the directory vnode.
  196  */
  197 static void
  198 nfs_freesillyrename(void *arg, __unused int pending)
  199 {
  200         struct sillyrename *sp;
  201 
  202         sp = arg;
  203         vrele(sp->s_dvp);
  204         free(sp, M_NEWNFSREQ);
  205 }
  206 
  207 int
  208 ncl_inactive(struct vop_inactive_args *ap)
  209 {
  210         struct nfsnode *np;
  211         struct sillyrename *sp;
  212         struct vnode *vp = ap->a_vp;
  213         boolean_t retv;
  214 
  215         np = VTONFS(vp);
  216 
  217         if (NFS_ISV4(vp) && vp->v_type == VREG) {
  218                 /*
  219                  * Since mmap()'d files do I/O after VOP_CLOSE(), the NFSv4
  220                  * Close operations are delayed until now. Any dirty
  221                  * buffers/pages must be flushed before the close, so that the
  222                  * stateid is available for the writes.
  223                  */
  224                 if (vp->v_object != NULL) {
  225                         VM_OBJECT_LOCK(vp->v_object);
  226                         retv = vm_object_page_clean(vp->v_object, 0, 0,
  227                             OBJPC_SYNC);
  228                         VM_OBJECT_UNLOCK(vp->v_object);
  229                 } else
  230                         retv = TRUE;
  231                 if (retv == TRUE) {
  232                         (void)ncl_flush(vp, MNT_WAIT, NULL, ap->a_td, 1, 0);
  233                         (void)nfsrpc_close(vp, 1, ap->a_td);
  234                 }
  235         }
  236 
  237         mtx_lock(&np->n_mtx);
  238         if (vp->v_type != VDIR) {
  239                 sp = np->n_sillyrename;
  240                 np->n_sillyrename = NULL;
  241         } else
  242                 sp = NULL;
  243         if (sp) {
  244                 mtx_unlock(&np->n_mtx);
  245                 (void) ncl_vinvalbuf(vp, 0, ap->a_td, 1);
  246                 /*
  247                  * Remove the silly file that was rename'd earlier
  248                  */
  249                 ncl_removeit(sp, vp);
  250                 crfree(sp->s_cred);
  251                 TASK_INIT(&sp->s_task, 0, nfs_freesillyrename, sp);
  252                 taskqueue_enqueue(taskqueue_thread, &sp->s_task);
  253                 mtx_lock(&np->n_mtx);
  254         }
  255         np->n_flag &= NMODIFIED;
  256         mtx_unlock(&np->n_mtx);
  257         return (0);
  258 }
  259 
  260 /*
  261  * Reclaim an nfsnode so that it can be used for other purposes.
  262  */
  263 int
  264 ncl_reclaim(struct vop_reclaim_args *ap)
  265 {
  266         struct vnode *vp = ap->a_vp;
  267         struct nfsnode *np = VTONFS(vp);
  268         struct nfsdmap *dp, *dp2;
  269 
  270         /*
  271          * If the NLM is running, give it a chance to abort pending
  272          * locks.
  273          */
  274         if (nfs_reclaim_p != NULL)
  275                 nfs_reclaim_p(ap);
  276 
  277         /*
  278          * Destroy the vm object and flush associated pages.
  279          */
  280         vnode_destroy_vobject(vp);
  281 
  282         if (NFS_ISV4(vp) && vp->v_type == VREG)
  283                 /*
  284                  * We can now safely close any remaining NFSv4 Opens for
  285                  * this file. Most opens will have already been closed by
  286                  * ncl_inactive(), but there are cases where it is not
  287                  * called, so we need to do it again here.
  288                  */
  289                 (void) nfsrpc_close(vp, 1, ap->a_td);
  290 
  291         vfs_hash_remove(vp);
  292 
  293         /*
  294          * Call nfscl_reclaimnode() to save attributes in the delegation,
  295          * as required.
  296          */
  297         if (vp->v_type == VREG)
  298                 nfscl_reclaimnode(vp);
  299 
  300         /*
  301          * Free up any directory cookie structures and
  302          * large file handle structures that might be associated with
  303          * this nfs node.
  304          */
  305         if (vp->v_type == VDIR) {
  306                 dp = LIST_FIRST(&np->n_cookies);
  307                 while (dp) {
  308                         dp2 = dp;
  309                         dp = LIST_NEXT(dp, ndm_list);
  310                         FREE((caddr_t)dp2, M_NFSDIROFF);
  311                 }
  312         }
  313         if (np->n_writecred != NULL)
  314                 crfree(np->n_writecred);
  315         FREE((caddr_t)np->n_fhp, M_NFSFH);
  316         if (np->n_v4 != NULL)
  317                 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
  318         mtx_destroy(&np->n_mtx);
  319         uma_zfree(newnfsnode_zone, vp->v_data);
  320         vp->v_data = NULL;
  321         return (0);
  322 }
  323 
  324 /*
  325  * Invalidate both the access and attribute caches for this vnode.
  326  */
  327 void
  328 ncl_invalcaches(struct vnode *vp)
  329 {
  330         struct nfsnode *np = VTONFS(vp);
  331         int i;
  332 
  333         mtx_lock(&np->n_mtx);
  334         for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
  335                 np->n_accesscache[i].stamp = 0;
  336         KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
  337         np->n_attrstamp = 0;
  338         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  339         mtx_unlock(&np->n_mtx);
  340 }
  341 

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