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/8/sys/fs/nfsclient/nfs_clnode.c 240213 2012-09-07 20:57:36Z rmacklem $");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/fcntl.h>
   41 #include <sys/lock.h>
   42 #include <sys/malloc.h>
   43 #include <sys/mount.h>
   44 #include <sys/namei.h>
   45 #include <sys/proc.h>
   46 #include <sys/socket.h>
   47 #include <sys/sysctl.h>
   48 #include <sys/taskqueue.h>
   49 #include <sys/vnode.h>
   50 
   51 #include <vm/uma.h>
   52 
   53 #include <fs/nfs/nfsport.h>
   54 #include <fs/nfsclient/nfsnode.h>
   55 #include <fs/nfsclient/nfsmount.h>
   56 #include <fs/nfsclient/nfs.h>
   57 
   58 #include <nfs/nfs_lock.h>
   59 
   60 extern struct vop_vector newnfs_vnodeops;
   61 extern struct buf_ops buf_ops_newnfs;
   62 MALLOC_DECLARE(M_NEWNFSREQ);
   63 
   64 uma_zone_t newnfsnode_zone;
   65 
   66 static void     nfs_freesillyrename(void *arg, __unused int pending);
   67 
   68 void
   69 ncl_nhinit(void)
   70 {
   71 
   72         newnfsnode_zone = uma_zcreate("NCLNODE", sizeof(struct nfsnode), NULL,
   73             NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
   74 }
   75 
   76 void
   77 ncl_nhuninit(void)
   78 {
   79         uma_zdestroy(newnfsnode_zone);
   80 }
   81 
   82 /*
   83  * ONLY USED FOR THE ROOT DIRECTORY. nfscl_nget() does the rest. If this
   84  * function is going to be used to get Regular Files, code must be added
   85  * to fill in the "struct nfsv4node".
   86  * Look up a vnode/nfsnode by file handle.
   87  * Callers must check for mount points!!
   88  * In all cases, a pointer to a
   89  * nfsnode structure is returned.
   90  */
   91 int
   92 ncl_nget(struct mount *mntp, u_int8_t *fhp, int fhsize, struct nfsnode **npp,
   93     int lkflags)
   94 {
   95         struct thread *td = curthread;  /* XXX */
   96         struct nfsnode *np;
   97         struct vnode *vp;
   98         struct vnode *nvp;
   99         int error;
  100         u_int hash;
  101         struct nfsmount *nmp;
  102         struct nfsfh *nfhp;
  103 
  104         nmp = VFSTONFS(mntp);
  105         *npp = NULL;
  106 
  107         hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT);
  108 
  109         MALLOC(nfhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
  110             M_NFSFH, M_WAITOK);
  111         bcopy(fhp, &nfhp->nfh_fh[0], fhsize);
  112         nfhp->nfh_len = fhsize;
  113         error = vfs_hash_get(mntp, hash, lkflags,
  114             td, &nvp, newnfs_vncmpf, nfhp);
  115         FREE(nfhp, M_NFSFH);
  116         if (error)
  117                 return (error);
  118         if (nvp != NULL) {
  119                 *npp = VTONFS(nvp);
  120                 return (0);
  121         }
  122 
  123         /*
  124          * Allocate before getnewvnode since doing so afterward
  125          * might cause a bogus v_data pointer to get dereferenced
  126          * elsewhere if zalloc should block.
  127          */
  128         np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO);
  129 
  130         error = getnewvnode("newnfs", mntp, &newnfs_vnodeops, &nvp);
  131         if (error) {
  132                 uma_zfree(newnfsnode_zone, np);
  133                 return (error);
  134         }
  135         vp = nvp;
  136         KASSERT(vp->v_bufobj.bo_bsize != 0, ("ncl_nget: bo_bsize == 0"));
  137         vp->v_bufobj.bo_ops = &buf_ops_newnfs;
  138         vp->v_data = np;
  139         np->n_vnode = vp;
  140         /* 
  141          * Initialize the mutex even if the vnode is going to be a loser.
  142          * This simplifies the logic in reclaim, which can then unconditionally
  143          * destroy the mutex (in the case of the loser, or if hash_insert
  144          * happened to return an error no special casing is needed).
  145          */
  146         mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
  147         /*
  148          * NFS supports recursive and shared locking.
  149          */
  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         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
  168         error = insmntque(vp, mntp);
  169         if (error != 0) {
  170                 *npp = NULL;
  171                 FREE((caddr_t)np->n_fhp, M_NFSFH);
  172                 mtx_destroy(&np->n_mtx);
  173                 uma_zfree(newnfsnode_zone, np);
  174                 return (error);
  175         }
  176         error = vfs_hash_insert(vp, hash, lkflags, 
  177             td, &nvp, newnfs_vncmpf, np->n_fhp);
  178         if (error)
  179                 return (error);
  180         if (nvp != NULL) {
  181                 *npp = VTONFS(nvp);
  182                 /* vfs_hash_insert() vput()'s the losing vnode */
  183                 return (0);
  184         }
  185         *npp = np;
  186 
  187         return (0);
  188 }
  189 
  190 /*
  191  * Do the vrele(sp->s_dvp) as a separate task in order to avoid a
  192  * deadlock because of a LOR when vrele() locks the directory vnode.
  193  */
  194 static void
  195 nfs_freesillyrename(void *arg, __unused int pending)
  196 {
  197         struct sillyrename *sp;
  198 
  199         sp = arg;
  200         vrele(sp->s_dvp);
  201         free(sp, M_NEWNFSREQ);
  202 }
  203 
  204 int
  205 ncl_inactive(struct vop_inactive_args *ap)
  206 {
  207         struct nfsnode *np;
  208         struct sillyrename *sp;
  209         struct vnode *vp = ap->a_vp;
  210         boolean_t retv;
  211 
  212         np = VTONFS(vp);
  213 
  214         if (NFS_ISV4(vp) && vp->v_type == VREG) {
  215                 /*
  216                  * Since mmap()'d files do I/O after VOP_CLOSE(), the NFSv4
  217                  * Close operations are delayed until now. Any dirty
  218                  * buffers/pages must be flushed before the close, so that the
  219                  * stateid is available for the writes.
  220                  */
  221                 if (vp->v_object != NULL) {
  222                         VM_OBJECT_LOCK(vp->v_object);
  223                         retv = vm_object_page_clean(vp->v_object, 0, 0,
  224                             OBJPC_SYNC);
  225                         VM_OBJECT_UNLOCK(vp->v_object);
  226                 } else
  227                         retv = TRUE;
  228                 if (retv == TRUE) {
  229                         (void)ncl_flush(vp, MNT_WAIT, NULL, ap->a_td, 1, 0);
  230                         (void)nfsrpc_close(vp, 1, ap->a_td);
  231                 }
  232         }
  233 
  234         mtx_lock(&np->n_mtx);
  235         if (vp->v_type != VDIR) {
  236                 sp = np->n_sillyrename;
  237                 np->n_sillyrename = NULL;
  238         } else
  239                 sp = NULL;
  240         if (sp) {
  241                 mtx_unlock(&np->n_mtx);
  242                 (void) ncl_vinvalbuf(vp, 0, ap->a_td, 1);
  243                 /*
  244                  * Remove the silly file that was rename'd earlier
  245                  */
  246                 ncl_removeit(sp, vp);
  247                 crfree(sp->s_cred);
  248                 TASK_INIT(&sp->s_task, 0, nfs_freesillyrename, sp);
  249                 taskqueue_enqueue(taskqueue_thread, &sp->s_task);
  250                 mtx_lock(&np->n_mtx);
  251         }
  252         np->n_flag &= NMODIFIED;
  253         mtx_unlock(&np->n_mtx);
  254         return (0);
  255 }
  256 
  257 /*
  258  * Reclaim an nfsnode so that it can be used for other purposes.
  259  */
  260 int
  261 ncl_reclaim(struct vop_reclaim_args *ap)
  262 {
  263         struct vnode *vp = ap->a_vp;
  264         struct nfsnode *np = VTONFS(vp);
  265         struct nfsdmap *dp, *dp2;
  266 
  267         /*
  268          * If the NLM is running, give it a chance to abort pending
  269          * locks.
  270          */
  271         if (nfs_reclaim_p != NULL)
  272                 nfs_reclaim_p(ap);
  273 
  274         /*
  275          * Destroy the vm object and flush associated pages.
  276          */
  277         vnode_destroy_vobject(vp);
  278 
  279         if (NFS_ISV4(vp) && vp->v_type == VREG)
  280                 /*
  281                  * We can now safely close any remaining NFSv4 Opens for
  282                  * this file. Most opens will have already been closed by
  283                  * ncl_inactive(), but there are cases where it is not
  284                  * called, so we need to do it again here.
  285                  */
  286                 (void) nfsrpc_close(vp, 1, ap->a_td);
  287 
  288         vfs_hash_remove(vp);
  289 
  290         /*
  291          * Call nfscl_reclaimnode() to save attributes in the delegation,
  292          * as required.
  293          */
  294         if (vp->v_type == VREG)
  295                 nfscl_reclaimnode(vp);
  296 
  297         /*
  298          * Free up any directory cookie structures and
  299          * large file handle structures that might be associated with
  300          * this nfs node.
  301          */
  302         if (vp->v_type == VDIR) {
  303                 dp = LIST_FIRST(&np->n_cookies);
  304                 while (dp) {
  305                         dp2 = dp;
  306                         dp = LIST_NEXT(dp, ndm_list);
  307                         FREE((caddr_t)dp2, M_NFSDIROFF);
  308                 }
  309         }
  310         if (np->n_writecred != NULL)
  311                 crfree(np->n_writecred);
  312         FREE((caddr_t)np->n_fhp, M_NFSFH);
  313         if (np->n_v4 != NULL)
  314                 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
  315         mtx_destroy(&np->n_mtx);
  316         uma_zfree(newnfsnode_zone, vp->v_data);
  317         vp->v_data = NULL;
  318         return (0);
  319 }
  320 
  321 /*
  322  * Invalidate both the access and attribute caches for this vnode.
  323  */
  324 void
  325 ncl_invalcaches(struct vnode *vp)
  326 {
  327         struct nfsnode *np = VTONFS(vp);
  328         int i;
  329 
  330         mtx_lock(&np->n_mtx);
  331         for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
  332                 np->n_accesscache[i].stamp = 0;
  333         np->n_attrstamp = 0;
  334         mtx_unlock(&np->n_mtx);
  335 }
  336 

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