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/11/sys/fs/nfsclient/nfs_clnode.c 331722 2018-03-29 02:50:57Z eadler $");
   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 #include <fs/nfsclient/nfs_kdtrace.h>
   58 
   59 #include <nfs/nfs_lock.h>
   60 
   61 extern struct vop_vector newnfs_vnodeops;
   62 extern struct buf_ops buf_ops_newnfs;
   63 MALLOC_DECLARE(M_NEWNFSREQ);
   64 
   65 uma_zone_t newnfsnode_zone;
   66 
   67 const char nfs_vnode_tag[] = "nfs";
   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         np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO);
  126 
  127         error = getnewvnode(nfs_vnode_tag, mntp, &newnfs_vnodeops, &nvp);
  128         if (error) {
  129                 uma_zfree(newnfsnode_zone, np);
  130                 return (error);
  131         }
  132         vp = nvp;
  133         KASSERT(vp->v_bufobj.bo_bsize != 0, ("ncl_nget: bo_bsize == 0"));
  134         vp->v_bufobj.bo_ops = &buf_ops_newnfs;
  135         vp->v_data = np;
  136         np->n_vnode = vp;
  137         /* 
  138          * Initialize the mutex even if the vnode is going to be a loser.
  139          * This simplifies the logic in reclaim, which can then unconditionally
  140          * destroy the mutex (in the case of the loser, or if hash_insert
  141          * happened to return an error no special casing is needed).
  142          */
  143         mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
  144         lockinit(&np->n_excl, PVFS, "nfsupg", VLKTIMEOUT, LK_NOSHARE |
  145             LK_CANRECURSE);
  146 
  147         /*
  148          * NFS supports recursive and shared locking.
  149          */
  150         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
  151         VN_LOCK_AREC(vp);
  152         VN_LOCK_ASHARE(vp);
  153         /* 
  154          * Are we getting the root? If so, make sure the vnode flags
  155          * are correct 
  156          */
  157         if ((fhsize == nmp->nm_fhsize) &&
  158             !bcmp(fhp, nmp->nm_fh, fhsize)) {
  159                 if (vp->v_type == VNON)
  160                         vp->v_type = VDIR;
  161                 vp->v_vflag |= VV_ROOT;
  162         }
  163         
  164         MALLOC(np->n_fhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
  165             M_NFSFH, M_WAITOK);
  166         bcopy(fhp, np->n_fhp->nfh_fh, fhsize);
  167         np->n_fhp->nfh_len = fhsize;
  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                 lockdestroy(&np->n_excl);
  174                 uma_zfree(newnfsnode_zone, np);
  175                 return (error);
  176         }
  177         error = vfs_hash_insert(vp, hash, lkflags, 
  178             td, &nvp, newnfs_vncmpf, np->n_fhp);
  179         if (error)
  180                 return (error);
  181         if (nvp != NULL) {
  182                 *npp = VTONFS(nvp);
  183                 /* vfs_hash_insert() vput()'s the losing vnode */
  184                 return (0);
  185         }
  186         *npp = np;
  187 
  188         return (0);
  189 }
  190 
  191 /*
  192  * Do the vrele(sp->s_dvp) as a separate task in order to avoid a
  193  * deadlock because of a LOR when vrele() locks the directory vnode.
  194  */
  195 static void
  196 nfs_freesillyrename(void *arg, __unused int pending)
  197 {
  198         struct sillyrename *sp;
  199 
  200         sp = arg;
  201         vrele(sp->s_dvp);
  202         free(sp, M_NEWNFSREQ);
  203 }
  204 
  205 static void
  206 ncl_releasesillyrename(struct vnode *vp, struct thread *td)
  207 {
  208         struct nfsnode *np;
  209         struct sillyrename *sp;
  210 
  211         ASSERT_VOP_ELOCKED(vp, "releasesillyrename");
  212         np = VTONFS(vp);
  213         mtx_assert(&np->n_mtx, MA_OWNED);
  214         if (vp->v_type != VDIR) {
  215                 sp = np->n_sillyrename;
  216                 np->n_sillyrename = NULL;
  217         } else
  218                 sp = NULL;
  219         if (sp != NULL) {
  220                 mtx_unlock(&np->n_mtx);
  221                 (void) ncl_vinvalbuf(vp, 0, td, 1);
  222                 /*
  223                  * Remove the silly file that was rename'd earlier
  224                  */
  225                 ncl_removeit(sp, vp);
  226                 crfree(sp->s_cred);
  227                 TASK_INIT(&sp->s_task, 0, nfs_freesillyrename, sp);
  228                 taskqueue_enqueue(taskqueue_thread, &sp->s_task);
  229                 mtx_lock(&np->n_mtx);
  230         }
  231 }
  232 
  233 int
  234 ncl_inactive(struct vop_inactive_args *ap)
  235 {
  236         struct vnode *vp = ap->a_vp;
  237         struct nfsnode *np;
  238         boolean_t retv;
  239 
  240         if (NFS_ISV4(vp) && vp->v_type == VREG) {
  241                 /*
  242                  * Since mmap()'d files do I/O after VOP_CLOSE(), the NFSv4
  243                  * Close operations are delayed until now. Any dirty
  244                  * buffers/pages must be flushed before the close, so that the
  245                  * stateid is available for the writes.
  246                  */
  247                 if (vp->v_object != NULL) {
  248                         VM_OBJECT_WLOCK(vp->v_object);
  249                         retv = vm_object_page_clean(vp->v_object, 0, 0,
  250                             OBJPC_SYNC);
  251                         VM_OBJECT_WUNLOCK(vp->v_object);
  252                 } else
  253                         retv = TRUE;
  254                 if (retv == TRUE) {
  255                         (void)ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0);
  256                         (void)nfsrpc_close(vp, 1, ap->a_td);
  257                 }
  258         }
  259 
  260         np = VTONFS(vp);
  261         mtx_lock(&np->n_mtx);
  262         ncl_releasesillyrename(vp, ap->a_td);
  263 
  264         /*
  265          * NMODIFIED means that there might be dirty/stale buffers
  266          * associated with the NFS vnode.
  267          * NDSCOMMIT means that the file is on a pNFS server and commits
  268          * should be done to the DS.
  269          * None of the other flags are meaningful after the vnode is unused.
  270          */
  271         np->n_flag &= (NMODIFIED | NDSCOMMIT);
  272         mtx_unlock(&np->n_mtx);
  273         return (0);
  274 }
  275 
  276 /*
  277  * Reclaim an nfsnode so that it can be used for other purposes.
  278  */
  279 int
  280 ncl_reclaim(struct vop_reclaim_args *ap)
  281 {
  282         struct vnode *vp = ap->a_vp;
  283         struct nfsnode *np = VTONFS(vp);
  284         struct nfsdmap *dp, *dp2;
  285 
  286         /*
  287          * If the NLM is running, give it a chance to abort pending
  288          * locks.
  289          */
  290         if (nfs_reclaim_p != NULL)
  291                 nfs_reclaim_p(ap);
  292 
  293         mtx_lock(&np->n_mtx);
  294         ncl_releasesillyrename(vp, ap->a_td);
  295         mtx_unlock(&np->n_mtx);
  296 
  297         /*
  298          * Destroy the vm object and flush associated pages.
  299          */
  300         vnode_destroy_vobject(vp);
  301 
  302         if (NFS_ISV4(vp) && vp->v_type == VREG)
  303                 /*
  304                  * We can now safely close any remaining NFSv4 Opens for
  305                  * this file. Most opens will have already been closed by
  306                  * ncl_inactive(), but there are cases where it is not
  307                  * called, so we need to do it again here.
  308                  */
  309                 (void) nfsrpc_close(vp, 1, ap->a_td);
  310 
  311         vfs_hash_remove(vp);
  312 
  313         /*
  314          * Call nfscl_reclaimnode() to save attributes in the delegation,
  315          * as required.
  316          */
  317         if (vp->v_type == VREG)
  318                 nfscl_reclaimnode(vp);
  319 
  320         /*
  321          * Free up any directory cookie structures and
  322          * large file handle structures that might be associated with
  323          * this nfs node.
  324          */
  325         if (vp->v_type == VDIR) {
  326                 dp = LIST_FIRST(&np->n_cookies);
  327                 while (dp) {
  328                         dp2 = dp;
  329                         dp = LIST_NEXT(dp, ndm_list);
  330                         FREE((caddr_t)dp2, M_NFSDIROFF);
  331                 }
  332         }
  333         if (np->n_writecred != NULL)
  334                 crfree(np->n_writecred);
  335         FREE((caddr_t)np->n_fhp, M_NFSFH);
  336         if (np->n_v4 != NULL)
  337                 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
  338         mtx_destroy(&np->n_mtx);
  339         lockdestroy(&np->n_excl);
  340         uma_zfree(newnfsnode_zone, vp->v_data);
  341         vp->v_data = NULL;
  342         return (0);
  343 }
  344 
  345 /*
  346  * Invalidate both the access and attribute caches for this vnode.
  347  */
  348 void
  349 ncl_invalcaches(struct vnode *vp)
  350 {
  351         struct nfsnode *np = VTONFS(vp);
  352         int i;
  353 
  354         mtx_lock(&np->n_mtx);
  355         for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
  356                 np->n_accesscache[i].stamp = 0;
  357         KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
  358         np->n_attrstamp = 0;
  359         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
  360         mtx_unlock(&np->n_mtx);
  361 }

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