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/8.2/sys/fs/nfsclient/nfs_clnode.c 215860 2010-11-26 11:37:35Z kib $");
   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/vnode.h>
   49 
   50 #include <vm/uma.h>
   51 
   52 #include <fs/nfs/nfsport.h>
   53 #include <fs/nfsclient/nfsnode.h>
   54 #include <fs/nfsclient/nfsmount.h>
   55 #include <fs/nfsclient/nfs.h>
   56 
   57 #include <nfs/nfs_lock.h>
   58 
   59 extern struct vop_vector newnfs_vnodeops;
   60 extern struct buf_ops buf_ops_newnfs;
   61 MALLOC_DECLARE(M_NEWNFSREQ);
   62 
   63 uma_zone_t newnfsnode_zone;
   64 
   65 void
   66 ncl_nhinit(void)
   67 {
   68 
   69         newnfsnode_zone = uma_zcreate("NCLNODE", sizeof(struct nfsnode), NULL,
   70             NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
   71 }
   72 
   73 void
   74 ncl_nhuninit(void)
   75 {
   76         uma_zdestroy(newnfsnode_zone);
   77 }
   78 
   79 /*
   80  * ONLY USED FOR THE ROOT DIRECTORY. nfscl_nget() does the rest. If this
   81  * function is going to be used to get Regular Files, code must be added
   82  * to fill in the "struct nfsv4node".
   83  * Look up a vnode/nfsnode by file handle.
   84  * Callers must check for mount points!!
   85  * In all cases, a pointer to a
   86  * nfsnode structure is returned.
   87  */
   88 int
   89 ncl_nget(struct mount *mntp, u_int8_t *fhp, int fhsize, struct nfsnode **npp)
   90 {
   91         struct thread *td = curthread;  /* XXX */
   92         struct nfsnode *np;
   93         struct vnode *vp;
   94         struct vnode *nvp;
   95         int error;
   96         u_int hash;
   97         struct nfsmount *nmp;
   98         struct nfsfh *nfhp;
   99 
  100         nmp = VFSTONFS(mntp);
  101         *npp = NULL;
  102 
  103         hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT);
  104 
  105         MALLOC(nfhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
  106             M_NFSFH, M_WAITOK);
  107         bcopy(fhp, &nfhp->nfh_fh[0], fhsize);
  108         nfhp->nfh_len = fhsize;
  109         error = vfs_hash_get(mntp, hash, LK_EXCLUSIVE,
  110             td, &nvp, newnfs_vncmpf, nfhp);
  111         FREE(nfhp, M_NFSFH);
  112         if (error)
  113                 return (error);
  114         if (nvp != NULL) {
  115                 *npp = VTONFS(nvp);
  116                 return (0);
  117         }
  118 
  119         /*
  120          * Allocate before getnewvnode since doing so afterward
  121          * might cause a bogus v_data pointer to get dereferenced
  122          * elsewhere if zalloc should block.
  123          */
  124         np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO);
  125 
  126         error = getnewvnode("newnfs", mntp, &newnfs_vnodeops, &nvp);
  127         if (error) {
  128                 uma_zfree(newnfsnode_zone, np);
  129                 return (error);
  130         }
  131         vp = nvp;
  132         vp->v_bufobj.bo_ops = &buf_ops_newnfs;
  133         vp->v_data = np;
  134         np->n_vnode = vp;
  135         /* 
  136          * Initialize the mutex even if the vnode is going to be a loser.
  137          * This simplifies the logic in reclaim, which can then unconditionally
  138          * destroy the mutex (in the case of the loser, or if hash_insert
  139          * happened to return an error no special casing is needed).
  140          */
  141         mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
  142         /*
  143          * NFS supports recursive and shared locking.
  144          */
  145         VN_LOCK_AREC(vp);
  146         VN_LOCK_ASHARE(vp);
  147         /* 
  148          * Are we getting the root? If so, make sure the vnode flags
  149          * are correct 
  150          */
  151         if ((fhsize == nmp->nm_fhsize) &&
  152             !bcmp(fhp, nmp->nm_fh, fhsize)) {
  153                 if (vp->v_type == VNON)
  154                         vp->v_type = VDIR;
  155                 vp->v_vflag |= VV_ROOT;
  156         }
  157         
  158         MALLOC(np->n_fhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
  159             M_NFSFH, M_WAITOK);
  160         bcopy(fhp, np->n_fhp->nfh_fh, fhsize);
  161         np->n_fhp->nfh_len = fhsize;
  162         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
  163         error = insmntque(vp, mntp);
  164         if (error != 0) {
  165                 *npp = NULL;
  166                 FREE((caddr_t)np->n_fhp, M_NFSFH);
  167                 mtx_destroy(&np->n_mtx);
  168                 uma_zfree(newnfsnode_zone, np);
  169                 return (error);
  170         }
  171         error = vfs_hash_insert(vp, hash, LK_EXCLUSIVE, 
  172             td, &nvp, newnfs_vncmpf, np->n_fhp);
  173         if (error)
  174                 return (error);
  175         if (nvp != NULL) {
  176                 *npp = VTONFS(nvp);
  177                 /* vfs_hash_insert() vput()'s the losing vnode */
  178                 return (0);
  179         }
  180         *npp = np;
  181 
  182         return (0);
  183 }
  184 
  185 int
  186 ncl_inactive(struct vop_inactive_args *ap)
  187 {
  188         struct nfsnode *np;
  189         struct sillyrename *sp;
  190         struct vnode *vp = ap->a_vp;
  191 
  192         np = VTONFS(vp);
  193 
  194         if (NFS_ISV4(vp) && vp->v_type == VREG) {
  195                 /*
  196                  * Since mmap()'d files do I/O after VOP_CLOSE(), the NFSv4
  197                  * Close operations are delayed until now. Any dirty buffers
  198                  * must be flushed before the close, so that the stateid is
  199                  * available for the writes.
  200                  */
  201                 (void) ncl_flush(vp, MNT_WAIT, NULL, ap->a_td, 1, 0);
  202                 (void) nfsrpc_close(vp, 1, ap->a_td);
  203         }
  204 
  205         if (vp->v_type != VDIR) {
  206                 sp = np->n_sillyrename;
  207                 np->n_sillyrename = NULL;
  208         } else
  209                 sp = NULL;
  210         if (sp) {
  211                 (void) ncl_vinvalbuf(vp, 0, ap->a_td, 1);
  212                 /*
  213                  * Remove the silly file that was rename'd earlier
  214                  */
  215                 ncl_removeit(sp, vp);
  216                 crfree(sp->s_cred);
  217                 vrele(sp->s_dvp);
  218                 FREE((caddr_t)sp, M_NEWNFSREQ);
  219         }
  220         np->n_flag &= NMODIFIED;
  221         return (0);
  222 }
  223 
  224 /*
  225  * Reclaim an nfsnode so that it can be used for other purposes.
  226  */
  227 int
  228 ncl_reclaim(struct vop_reclaim_args *ap)
  229 {
  230         struct vnode *vp = ap->a_vp;
  231         struct nfsnode *np = VTONFS(vp);
  232         struct nfsdmap *dp, *dp2;
  233 
  234         if (NFS_ISV4(vp) && vp->v_type == VREG)
  235                 /*
  236                  * Since mmap()'d files do I/O after VOP_CLOSE(), the NFSv4
  237                  * Close operations are delayed until ncl_inactive().
  238                  * However, since VOP_INACTIVE() is not guaranteed to be
  239                  * called, we need to do it again here.
  240                  */
  241                 (void) nfsrpc_close(vp, 1, ap->a_td);
  242 
  243         /*
  244          * If the NLM is running, give it a chance to abort pending
  245          * locks.
  246          */
  247         if (nfs_reclaim_p != NULL)
  248                 nfs_reclaim_p(ap);
  249 
  250         /*
  251          * Destroy the vm object and flush associated pages.
  252          */
  253         vnode_destroy_vobject(vp);
  254 
  255         vfs_hash_remove(vp);
  256 
  257         /*
  258          * Call nfscl_reclaimnode() to save attributes in the delegation,
  259          * as required.
  260          */
  261         if (vp->v_type == VREG)
  262                 nfscl_reclaimnode(vp);
  263 
  264         /*
  265          * Free up any directory cookie structures and
  266          * large file handle structures that might be associated with
  267          * this nfs node.
  268          */
  269         if (vp->v_type == VDIR) {
  270                 dp = LIST_FIRST(&np->n_cookies);
  271                 while (dp) {
  272                         dp2 = dp;
  273                         dp = LIST_NEXT(dp, ndm_list);
  274                         FREE((caddr_t)dp2, M_NFSDIROFF);
  275                 }
  276         }
  277         FREE((caddr_t)np->n_fhp, M_NFSFH);
  278         if (np->n_v4 != NULL)
  279                 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
  280         mtx_destroy(&np->n_mtx);
  281         uma_zfree(newnfsnode_zone, vp->v_data);
  282         vp->v_data = NULL;
  283         return (0);
  284 }
  285 
  286 /*
  287  * Invalidate both the access and attribute caches for this vnode.
  288  */
  289 void
  290 ncl_invalcaches(struct vnode *vp)
  291 {
  292         struct nfsnode *np = VTONFS(vp);
  293         int i;
  294 
  295         mtx_lock(&np->n_mtx);
  296         for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
  297                 np->n_accesscache[i].stamp = 0;
  298         np->n_attrstamp = 0;
  299         mtx_unlock(&np->n_mtx);
  300 }
  301 

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