1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from nfs_subs.c 8.8 (Berkeley) 5/22/95 35 */ 36 37 #include <sys/cdefs.h> 38 /* 39 * These functions support the macros and help fiddle mbuf chains for 40 * the nfs op functions. They do things like create the rpc header and 41 * copy data between mbuf chains and uio lists. 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/bio.h> 48 #include <sys/buf.h> 49 #include <sys/proc.h> 50 #include <sys/mount.h> 51 #include <sys/vnode.h> 52 #include <sys/namei.h> 53 #include <sys/mbuf.h> 54 #include <sys/socket.h> 55 #include <sys/stat.h> 56 #include <sys/malloc.h> 57 #include <sys/stdarg.h> 58 #include <sys/syscall.h> 59 #include <sys/sysproto.h> 60 #include <sys/taskqueue.h> 61 62 #include <vm/vm.h> 63 #include <vm/vm_object.h> 64 #include <vm/vm_extern.h> 65 #include <vm/uma.h> 66 67 #include <fs/nfs/nfsport.h> 68 #include <fs/nfsclient/nfsnode.h> 69 #include <fs/nfsclient/nfsmount.h> 70 #include <fs/nfsclient/nfs.h> 71 #include <fs/nfsclient/nfs_kdtrace.h> 72 73 #include <netinet/in.h> 74 75 extern struct mtx ncl_iod_mutex; 76 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON]; 77 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON]; 78 extern int ncl_numasync; 79 extern unsigned int ncl_iodmax; 80 extern struct nfsstatsv1 nfsstatsv1; 81 82 struct task ncl_nfsiodnew_task; 83 84 int 85 ncl_uninit(struct vfsconf *vfsp) 86 { 87 /* 88 * XXX: Unloading of nfscl module is unsupported. 89 */ 90 #if 0 91 int i; 92 93 /* 94 * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup 95 * any sleeping nfsiods so they check ncl_iodmax and exit. 96 */ 97 NFSLOCKIOD(); 98 ncl_iodmax = 0; 99 for (i = 0; i < ncl_numasync; i++) 100 if (ncl_iodwant[i] == NFSIOD_AVAILABLE) 101 wakeup(&ncl_iodwant[i]); 102 /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */ 103 while (ncl_numasync) 104 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0); 105 NFSUNLOCKIOD(); 106 ncl_nhuninit(); 107 return (0); 108 #else 109 return (EOPNOTSUPP); 110 #endif 111 } 112 113 /* Returns with NFSLOCKNODE() held. */ 114 void 115 ncl_dircookie_lock(struct nfsnode *np) 116 { 117 NFSLOCKNODE(np); 118 while (np->n_flag & NDIRCOOKIELK) 119 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0); 120 np->n_flag |= NDIRCOOKIELK; 121 } 122 123 void 124 ncl_dircookie_unlock(struct nfsnode *np) 125 { 126 NFSLOCKNODE(np); 127 np->n_flag &= ~NDIRCOOKIELK; 128 wakeup(&np->n_flag); 129 NFSUNLOCKNODE(np); 130 } 131 132 bool 133 ncl_excl_start(struct vnode *vp) 134 { 135 struct nfsnode *np; 136 int vn_lk; 137 138 ASSERT_VOP_LOCKED(vp, "ncl_excl_start"); 139 vn_lk = NFSVOPISLOCKED(vp); 140 if (vn_lk == LK_EXCLUSIVE) 141 return (false); 142 KASSERT(vn_lk == LK_SHARED, 143 ("ncl_excl_start: wrong vnode lock %d", vn_lk)); 144 /* Ensure exclusive access, this might block */ 145 np = VTONFS(vp); 146 lockmgr(&np->n_excl, LK_EXCLUSIVE, NULL); 147 return (true); 148 } 149 150 void 151 ncl_excl_finish(struct vnode *vp, bool old_lock) 152 { 153 struct nfsnode *np; 154 155 if (!old_lock) 156 return; 157 np = VTONFS(vp); 158 lockmgr(&np->n_excl, LK_RELEASE, NULL); 159 } 160 161 #ifdef NFS_ACDEBUG 162 #include <sys/sysctl.h> 163 SYSCTL_DECL(_vfs_nfs); 164 static int nfs_acdebug; 165 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); 166 #endif 167 168 /* 169 * Check the time stamp 170 * If the cache is valid, copy contents to *vap and return 0 171 * otherwise return an error 172 */ 173 int 174 ncl_getattrcache(struct vnode *vp, struct vattr *vaper) 175 { 176 struct nfsnode *np; 177 struct vattr *vap; 178 struct nfsmount *nmp; 179 int timeo, mustflush; 180 u_quad_t nsize; 181 bool setnsize; 182 183 np = VTONFS(vp); 184 vap = &np->n_vattr.na_vattr; 185 nmp = VFSTONFS(vp->v_mount); 186 mustflush = nfscl_nodeleg(vp, 0); /* must be before mtx_lock() */ 187 NFSLOCKNODE(np); 188 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */ 189 timeo = (time_second - np->n_mtime.tv_sec) / 10; 190 191 #ifdef NFS_ACDEBUG 192 if (nfs_acdebug>1) 193 printf("ncl_getattrcache: initial timeo = %d\n", timeo); 194 #endif 195 196 if (vap->va_type == VDIR) { 197 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin) 198 timeo = nmp->nm_acdirmin; 199 else if (timeo > nmp->nm_acdirmax) 200 timeo = nmp->nm_acdirmax; 201 } else { 202 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin) 203 timeo = nmp->nm_acregmin; 204 else if (timeo > nmp->nm_acregmax) 205 timeo = nmp->nm_acregmax; 206 } 207 208 #ifdef NFS_ACDEBUG 209 if (nfs_acdebug > 2) 210 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n", 211 nmp->nm_acregmin, nmp->nm_acregmax, 212 nmp->nm_acdirmin, nmp->nm_acdirmax); 213 214 if (nfs_acdebug) 215 printf("ncl_getattrcache: age = %d; final timeo = %d\n", 216 (time_second - np->n_attrstamp), timeo); 217 #endif 218 219 if (mustflush != 0 && (np->n_attrstamp == 0 || 220 time_second - np->n_attrstamp >= timeo)) { 221 nfsstatsv1.attrcache_misses++; 222 NFSUNLOCKNODE(np); 223 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp); 224 return( ENOENT); 225 } 226 nfsstatsv1.attrcache_hits++; 227 setnsize = false; 228 if (vap->va_size != np->n_size) { 229 if (vap->va_type == VREG) { 230 if (np->n_flag & NMODIFIED) { 231 if (vap->va_size < np->n_size) 232 vap->va_size = np->n_size; 233 else 234 np->n_size = vap->va_size; 235 } else { 236 np->n_size = vap->va_size; 237 } 238 setnsize = ncl_pager_setsize(vp, &nsize); 239 } else { 240 np->n_size = vap->va_size; 241 } 242 } 243 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); 244 if (np->n_flag & NCHG) { 245 if (np->n_flag & NACC) 246 vaper->va_atime = np->n_atim; 247 if (np->n_flag & NUPD) 248 vaper->va_mtime = np->n_mtim; 249 } 250 NFSUNLOCKNODE(np); 251 if (setnsize) 252 vnode_pager_setsize(vp, nsize); 253 KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap); 254 return (0); 255 } 256 257 static nfsuint64 nfs_nullcookie = { { 0, 0 } }; 258 /* 259 * This function finds the directory cookie that corresponds to the 260 * logical byte offset given. 261 */ 262 nfsuint64 * 263 ncl_getcookie(struct nfsnode *np, off_t off, int add) 264 { 265 struct nfsdmap *dp, *dp2; 266 int pos; 267 nfsuint64 *retval = NULL; 268 269 pos = (uoff_t)off / NFS_DIRBLKSIZ; 270 if (pos == 0 || off < 0) { 271 KASSERT(!add, ("nfs getcookie add at <= 0")); 272 return (&nfs_nullcookie); 273 } 274 pos--; 275 dp = LIST_FIRST(&np->n_cookies); 276 if (!dp) { 277 if (add) { 278 dp = malloc(sizeof (struct nfsdmap), 279 M_NFSDIROFF, M_WAITOK); 280 dp->ndm_eocookie = 0; 281 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); 282 } else 283 goto out; 284 } 285 while (pos >= NFSNUMCOOKIES) { 286 pos -= NFSNUMCOOKIES; 287 if (LIST_NEXT(dp, ndm_list)) { 288 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && 289 pos >= dp->ndm_eocookie) 290 goto out; 291 dp = LIST_NEXT(dp, ndm_list); 292 } else if (add) { 293 dp2 = malloc(sizeof (struct nfsdmap), 294 M_NFSDIROFF, M_WAITOK); 295 dp2->ndm_eocookie = 0; 296 LIST_INSERT_AFTER(dp, dp2, ndm_list); 297 dp = dp2; 298 } else 299 goto out; 300 } 301 if (pos >= dp->ndm_eocookie) { 302 if (add) 303 dp->ndm_eocookie = pos + 1; 304 else 305 goto out; 306 } 307 retval = &dp->ndm_cookies[pos]; 308 out: 309 return (retval); 310 } 311 312 /* 313 * Invalidate cached directory information, except for the actual directory 314 * blocks (which are invalidated separately). 315 * Done mainly to avoid the use of stale offset cookies. 316 */ 317 void 318 ncl_invaldir(struct vnode *vp) 319 { 320 struct nfsnode *np = VTONFS(vp); 321 322 KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir")); 323 ncl_dircookie_lock(np); 324 np->n_direofoffset = 0; 325 NFSUNLOCKNODE(np); 326 np->n_cookieverf.nfsuquad[0] = 0; 327 np->n_cookieverf.nfsuquad[1] = 0; 328 if (LIST_FIRST(&np->n_cookies)) 329 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0; 330 ncl_dircookie_unlock(np); 331 } 332 333 /* 334 * The write verifier has changed (probably due to a server reboot), so all 335 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the 336 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT 337 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the 338 * mount point. 339 * 340 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data 341 * writes are not clusterable. 342 */ 343 void 344 ncl_clearcommit(struct mount *mp) 345 { 346 struct vnode *vp, *nvp; 347 struct buf *bp, *nbp; 348 struct bufobj *bo; 349 350 MNT_VNODE_FOREACH_ALL(vp, mp, nvp) { 351 bo = &vp->v_bufobj; 352 vholdl(vp); 353 VI_UNLOCK(vp); 354 BO_LOCK(bo); 355 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 356 if (!BUF_ISLOCKED(bp) && 357 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 358 == (B_DELWRI | B_NEEDCOMMIT)) 359 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 360 } 361 BO_UNLOCK(bo); 362 vdrop(vp); 363 } 364 } 365 366 /* 367 * Called once to initialize data structures... 368 */ 369 int 370 ncl_init(struct vfsconf *vfsp) 371 { 372 int i; 373 374 /* Ensure async daemons disabled */ 375 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) { 376 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE; 377 ncl_iodmount[i] = NULL; 378 } 379 TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL); 380 ncl_nhinit(); /* Init the nfsnode table */ 381 382 return (0); 383 } 384