sys/fs/nfsclient/nfs_clnode.c

   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("$FreeBSD$");
  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         /*
 145          * NFS supports recursive and shared locking.
 146          */
 147         lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
 148         VN_LOCK_AREC(vp);
 149         VN_LOCK_ASHARE(vp);
 150         /*
 151          * Are we getting the root? If so, make sure the vnode flags
 152          * are correct
 153          */
 154         if ((fhsize == nmp->nm_fhsize) &&
 155             !bcmp(fhp, nmp->nm_fh, fhsize)) {
 156                 if (vp->v_type == VNON)
 157                         vp->v_type = VDIR;
 158                 vp->v_vflag |= VV_ROOT;
 159         }
 160
 161         MALLOC(np->n_fhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
 162             M_NFSFH, M_WAITOK);
 163         bcopy(fhp, np->n_fhp->nfh_fh, fhsize);
 164         np->n_fhp->nfh_len = fhsize;
 165         error = insmntque(vp, mntp);
 166         if (error != 0) {
 167                 *npp = NULL;
 168                 FREE((caddr_t)np->n_fhp, M_NFSFH);
 169                 mtx_destroy(&np->n_mtx);
 170                 uma_zfree(newnfsnode_zone, np);
 171                 return (error);
 172         }
 173         error = vfs_hash_insert(vp, hash, lkflags,
 174             td, &nvp, newnfs_vncmpf, np->n_fhp);
 175         if (error)
 176                 return (error);
 177         if (nvp != NULL) {
 178                 *npp = VTONFS(nvp);
 179                 /* vfs_hash_insert() vput()'s the losing vnode */
 180                 return (0);
 181         }
 182         *npp = np;
 183
 184         return (0);
 185 }
 186
 187 /*
 188  * Do the vrele(sp->s_dvp) as a separate task in order to avoid a
 189  * deadlock because of a LOR when vrele() locks the directory vnode.
 190  */
 191 static void
 192 nfs_freesillyrename(void *arg, __unused int pending)
 193 {
 194         struct sillyrename *sp;
 195
 196         sp = arg;
 197         vrele(sp->s_dvp);
 198         free(sp, M_NEWNFSREQ);
 199 }
 200
 201 static void
 202 ncl_releasesillyrename(struct vnode *vp, struct thread *td)
 203 {
 204         struct nfsnode *np;
 205         struct sillyrename *sp;
 206
 207         ASSERT_VOP_ELOCKED(vp, "releasesillyrename");
 208         np = VTONFS(vp);
 209         mtx_assert(&np->n_mtx, MA_OWNED);
 210         if (vp->v_type != VDIR) {
 211                 sp = np->n_sillyrename;
 212                 np->n_sillyrename = NULL;
 213         } else
 214                 sp = NULL;
 215         if (sp != NULL) {
 216                 mtx_unlock(&np->n_mtx);
 217                 (void) ncl_vinvalbuf(vp, 0, td, 1);
 218                 /*
 219                  * Remove the silly file that was rename'd earlier
 220                  */
 221                 ncl_removeit(sp, vp);
 222                 crfree(sp->s_cred);
 223                 TASK_INIT(&sp->s_task, 0, nfs_freesillyrename, sp);
 224                 taskqueue_enqueue(taskqueue_thread, &sp->s_task);
 225                 mtx_lock(&np->n_mtx);
 226         }
 227 }
 228
 229 int
 230 ncl_inactive(struct vop_inactive_args *ap)
 231 {
 232         struct vnode *vp = ap->a_vp;
 233         struct nfsnode *np;
 234         boolean_t retv;
 235
 236         if (NFS_ISV4(vp) && vp->v_type == VREG) {
 237                 /*
 238                  * Since mmap()'d files do I/O after VOP_CLOSE(), the NFSv4
 239                  * Close operations are delayed until now. Any dirty
 240                  * buffers/pages must be flushed before the close, so that the
 241                  * stateid is available for the writes.
 242                  */
 243                 if (vp->v_object != NULL) {
 244                         VM_OBJECT_WLOCK(vp->v_object);
 245                         retv = vm_object_page_clean(vp->v_object, 0, 0,
 246                             OBJPC_SYNC);
 247                         VM_OBJECT_WUNLOCK(vp->v_object);
 248                 } else
 249                         retv = TRUE;
 250                 if (retv == TRUE) {
 251                         (void)ncl_flush(vp, MNT_WAIT, NULL, ap->a_td, 1, 0);
 252                         (void)nfsrpc_close(vp, 1, ap->a_td);
 253                 }
 254         }
 255
 256         np = VTONFS(vp);
 257         mtx_lock(&np->n_mtx);
 258         ncl_releasesillyrename(vp, ap->a_td);
 259
 260         /*
 261          * NMODIFIED means that there might be dirty/stale buffers
 262          * associated with the NFS vnode.  None of the other flags are
 263          * meaningful after the vnode is unused.
 264          */
 265         np->n_flag &= NMODIFIED;
 266         mtx_unlock(&np->n_mtx);
 267         return (0);
 268 }
 269
 270 /*
 271  * Reclaim an nfsnode so that it can be used for other purposes.
 272  */
 273 int
 274 ncl_reclaim(struct vop_reclaim_args *ap)
 275 {
 276         struct vnode *vp = ap->a_vp;
 277         struct nfsnode *np = VTONFS(vp);
 278         struct nfsdmap *dp, *dp2;
 279
 280         /*
 281          * If the NLM is running, give it a chance to abort pending
 282          * locks.
 283          */
 284         if (nfs_reclaim_p != NULL)
 285                 nfs_reclaim_p(ap);
 286
 287         mtx_lock(&np->n_mtx);
 288         ncl_releasesillyrename(vp, ap->a_td);
 289         mtx_unlock(&np->n_mtx);
 290
 291         /*
 292          * Destroy the vm object and flush associated pages.
 293          */
 294         vnode_destroy_vobject(vp);
 295
 296         if (NFS_ISV4(vp) && vp->v_type == VREG)
 297                 /*
 298                  * We can now safely close any remaining NFSv4 Opens for
 299                  * this file. Most opens will have already been closed by
 300                  * ncl_inactive(), but there are cases where it is not
 301                  * called, so we need to do it again here.
 302                  */
 303                 (void) nfsrpc_close(vp, 1, ap->a_td);
 304
 305         vfs_hash_remove(vp);
 306
 307         /*
 308          * Call nfscl_reclaimnode() to save attributes in the delegation,
 309          * as required.
 310          */
 311         if (vp->v_type == VREG)
 312                 nfscl_reclaimnode(vp);
 313
 314         /*
 315          * Free up any directory cookie structures and
 316          * large file handle structures that might be associated with
 317          * this nfs node.
 318          */
 319         if (vp->v_type == VDIR) {
 320                 dp = LIST_FIRST(&np->n_cookies);
 321                 while (dp) {
 322                         dp2 = dp;
 323                         dp = LIST_NEXT(dp, ndm_list);
 324                         FREE((caddr_t)dp2, M_NFSDIROFF);
 325                 }
 326         }
 327         if (np->n_writecred != NULL)
 328                 crfree(np->n_writecred);
 329         FREE((caddr_t)np->n_fhp, M_NFSFH);
 330         if (np->n_v4 != NULL)
 331                 FREE((caddr_t)np->n_v4, M_NFSV4NODE);
 332         mtx_destroy(&np->n_mtx);
 333         uma_zfree(newnfsnode_zone, vp->v_data);
 334         vp->v_data = NULL;
 335         return (0);
 336 }
 337
 338 /*
 339  * Invalidate both the access and attribute caches for this vnode.
 340  */
 341 void
 342 ncl_invalcaches(struct vnode *vp)
 343 {
 344         struct nfsnode *np = VTONFS(vp);
 345         int i;
 346
 347         mtx_lock(&np->n_mtx);
 348         for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
 349                 np->n_accesscache[i].stamp = 0;
 350         KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
 351         np->n_attrstamp = 0;
 352         KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
 353         mtx_unlock(&np->n_mtx);
 354 }