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_subs.c 8.8 (Berkeley) 5/22/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include "opt_kdtrace.h" 39 40 /* 41 * These functions support the macros and help fiddle mbuf chains for 42 * the nfs op functions. They do things like create the rpc header and 43 * copy data between mbuf chains and uio lists. 44 */ 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/bio.h> 50 #include <sys/buf.h> 51 #include <sys/proc.h> 52 #include <sys/mount.h> 53 #include <sys/vnode.h> 54 #include <sys/namei.h> 55 #include <sys/mbuf.h> 56 #include <sys/socket.h> 57 #include <sys/stat.h> 58 #include <sys/malloc.h> 59 #include <sys/sysent.h> 60 #include <sys/syscall.h> 61 #include <sys/sysproto.h> 62 #include <sys/taskqueue.h> 63 64 #include <vm/vm.h> 65 #include <vm/vm_object.h> 66 #include <vm/vm_extern.h> 67 #include <vm/uma.h> 68 69 #include <fs/nfs/nfsport.h> 70 #include <fs/nfsclient/nfsnode.h> 71 #include <fs/nfsclient/nfsmount.h> 72 #include <fs/nfsclient/nfs.h> 73 #include <fs/nfsclient/nfs_kdtrace.h> 74 75 #include <netinet/in.h> 76 77 /* 78 * Note that stdarg.h and the ANSI style va_start macro is used for both 79 * ANSI and traditional C compilers. 80 */ 81 #include <machine/stdarg.h> 82 83 extern struct mtx ncl_iod_mutex; 84 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON]; 85 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON]; 86 extern int ncl_numasync; 87 extern unsigned int ncl_iodmax; 88 extern struct nfsstats newnfsstats; 89 90 struct task ncl_nfsiodnew_task; 91 92 int 93 ncl_uninit(struct vfsconf *vfsp) 94 { 95 /* 96 * XXX: Unloading of nfscl module is unsupported. 97 */ 98 #if 0 99 int i; 100 101 /* 102 * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup 103 * any sleeping nfsiods so they check ncl_iodmax and exit. 104 */ 105 mtx_lock(&ncl_iod_mutex); 106 ncl_iodmax = 0; 107 for (i = 0; i < ncl_numasync; i++) 108 if (ncl_iodwant[i] == NFSIOD_AVAILABLE) 109 wakeup(&ncl_iodwant[i]); 110 /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */ 111 while (ncl_numasync) 112 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0); 113 mtx_unlock(&ncl_iod_mutex); 114 ncl_nhuninit(); 115 return (0); 116 #else 117 return (EOPNOTSUPP); 118 #endif 119 } 120 121 void 122 ncl_dircookie_lock(struct nfsnode *np) 123 { 124 mtx_lock(&np->n_mtx); 125 while (np->n_flag & NDIRCOOKIELK) 126 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0); 127 np->n_flag |= NDIRCOOKIELK; 128 mtx_unlock(&np->n_mtx); 129 } 130 131 void 132 ncl_dircookie_unlock(struct nfsnode *np) 133 { 134 mtx_lock(&np->n_mtx); 135 np->n_flag &= ~NDIRCOOKIELK; 136 wakeup(&np->n_flag); 137 mtx_unlock(&np->n_mtx); 138 } 139 140 int 141 ncl_upgrade_vnlock(struct vnode *vp) 142 { 143 int old_lock; 144 145 ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock"); 146 old_lock = NFSVOPISLOCKED(vp); 147 if (old_lock != LK_EXCLUSIVE) { 148 KASSERT(old_lock == LK_SHARED, 149 ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock)); 150 /* Upgrade to exclusive lock, this might block */ 151 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 152 } 153 return (old_lock); 154 } 155 156 void 157 ncl_downgrade_vnlock(struct vnode *vp, int old_lock) 158 { 159 if (old_lock != LK_EXCLUSIVE) { 160 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock)); 161 /* Downgrade from exclusive lock. */ 162 NFSVOPLOCK(vp, LK_DOWNGRADE | LK_RETRY); 163 } 164 } 165 166 void 167 ncl_printf(const char *fmt, ...) 168 { 169 va_list ap; 170 171 mtx_lock(&Giant); 172 va_start(ap, fmt); 173 vprintf(fmt, ap); 174 va_end(ap); 175 mtx_unlock(&Giant); 176 } 177 178 #ifdef NFS_ACDEBUG 179 #include <sys/sysctl.h> 180 SYSCTL_DECL(_vfs_nfs); 181 static int nfs_acdebug; 182 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); 183 #endif 184 185 /* 186 * Check the time stamp 187 * If the cache is valid, copy contents to *vap and return 0 188 * otherwise return an error 189 */ 190 int 191 ncl_getattrcache(struct vnode *vp, struct vattr *vaper) 192 { 193 struct nfsnode *np; 194 struct vattr *vap; 195 struct nfsmount *nmp; 196 int timeo, mustflush; 197 198 np = VTONFS(vp); 199 vap = &np->n_vattr.na_vattr; 200 nmp = VFSTONFS(vp->v_mount); 201 mustflush = nfscl_mustflush(vp); /* must be before mtx_lock() */ 202 #ifdef NFS_ACDEBUG 203 mtx_lock(&Giant); /* ncl_printf() */ 204 #endif 205 mtx_lock(&np->n_mtx); 206 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */ 207 timeo = (time_second - np->n_mtime.tv_sec) / 10; 208 209 #ifdef NFS_ACDEBUG 210 if (nfs_acdebug>1) 211 ncl_printf("nfs_getattrcache: initial timeo = %d\n", timeo); 212 #endif 213 214 if (vap->va_type == VDIR) { 215 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin) 216 timeo = nmp->nm_acdirmin; 217 else if (timeo > nmp->nm_acdirmax) 218 timeo = nmp->nm_acdirmax; 219 } else { 220 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin) 221 timeo = nmp->nm_acregmin; 222 else if (timeo > nmp->nm_acregmax) 223 timeo = nmp->nm_acregmax; 224 } 225 226 #ifdef NFS_ACDEBUG 227 if (nfs_acdebug > 2) 228 ncl_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n", 229 nmp->nm_acregmin, nmp->nm_acregmax, 230 nmp->nm_acdirmin, nmp->nm_acdirmax); 231 232 if (nfs_acdebug) 233 ncl_printf("nfs_getattrcache: age = %d; final timeo = %d\n", 234 (time_second - np->n_attrstamp), timeo); 235 #endif 236 237 if ((time_second - np->n_attrstamp) >= timeo && 238 (mustflush != 0 || np->n_attrstamp == 0)) { 239 newnfsstats.attrcache_misses++; 240 mtx_unlock(&np->n_mtx); 241 #ifdef NFS_ACDEBUG 242 mtx_unlock(&Giant); /* ncl_printf() */ 243 #endif 244 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp); 245 return( ENOENT); 246 } 247 newnfsstats.attrcache_hits++; 248 if (vap->va_size != np->n_size) { 249 if (vap->va_type == VREG) { 250 if (np->n_flag & NMODIFIED) { 251 if (vap->va_size < np->n_size) 252 vap->va_size = np->n_size; 253 else 254 np->n_size = vap->va_size; 255 } else { 256 np->n_size = vap->va_size; 257 } 258 vnode_pager_setsize(vp, np->n_size); 259 } else { 260 np->n_size = vap->va_size; 261 } 262 } 263 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); 264 if (np->n_flag & NCHG) { 265 if (np->n_flag & NACC) 266 vaper->va_atime = np->n_atim; 267 if (np->n_flag & NUPD) 268 vaper->va_mtime = np->n_mtim; 269 } 270 mtx_unlock(&np->n_mtx); 271 #ifdef NFS_ACDEBUG 272 mtx_unlock(&Giant); /* ncl_printf() */ 273 #endif 274 KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap); 275 return (0); 276 } 277 278 static nfsuint64 nfs_nullcookie = { { 0, 0 } }; 279 /* 280 * This function finds the directory cookie that corresponds to the 281 * logical byte offset given. 282 */ 283 nfsuint64 * 284 ncl_getcookie(struct nfsnode *np, off_t off, int add) 285 { 286 struct nfsdmap *dp, *dp2; 287 int pos; 288 nfsuint64 *retval = NULL; 289 290 pos = (uoff_t)off / NFS_DIRBLKSIZ; 291 if (pos == 0 || off < 0) { 292 KASSERT(!add, ("nfs getcookie add at <= 0")); 293 return (&nfs_nullcookie); 294 } 295 pos--; 296 dp = LIST_FIRST(&np->n_cookies); 297 if (!dp) { 298 if (add) { 299 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap), 300 M_NFSDIROFF, M_WAITOK); 301 dp->ndm_eocookie = 0; 302 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); 303 } else 304 goto out; 305 } 306 while (pos >= NFSNUMCOOKIES) { 307 pos -= NFSNUMCOOKIES; 308 if (LIST_NEXT(dp, ndm_list)) { 309 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && 310 pos >= dp->ndm_eocookie) 311 goto out; 312 dp = LIST_NEXT(dp, ndm_list); 313 } else if (add) { 314 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap), 315 M_NFSDIROFF, M_WAITOK); 316 dp2->ndm_eocookie = 0; 317 LIST_INSERT_AFTER(dp, dp2, ndm_list); 318 dp = dp2; 319 } else 320 goto out; 321 } 322 if (pos >= dp->ndm_eocookie) { 323 if (add) 324 dp->ndm_eocookie = pos + 1; 325 else 326 goto out; 327 } 328 retval = &dp->ndm_cookies[pos]; 329 out: 330 return (retval); 331 } 332 333 /* 334 * Invalidate cached directory information, except for the actual directory 335 * blocks (which are invalidated separately). 336 * Done mainly to avoid the use of stale offset cookies. 337 */ 338 void 339 ncl_invaldir(struct vnode *vp) 340 { 341 struct nfsnode *np = VTONFS(vp); 342 343 KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir")); 344 ncl_dircookie_lock(np); 345 np->n_direofoffset = 0; 346 np->n_cookieverf.nfsuquad[0] = 0; 347 np->n_cookieverf.nfsuquad[1] = 0; 348 if (LIST_FIRST(&np->n_cookies)) 349 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0; 350 ncl_dircookie_unlock(np); 351 } 352 353 /* 354 * The write verifier has changed (probably due to a server reboot), so all 355 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the 356 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT 357 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the 358 * mount point. 359 * 360 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data 361 * writes are not clusterable. 362 */ 363 void 364 ncl_clearcommit(struct mount *mp) 365 { 366 struct vnode *vp, *nvp; 367 struct buf *bp, *nbp; 368 struct bufobj *bo; 369 370 MNT_VNODE_FOREACH_ALL(vp, mp, nvp) { 371 bo = &vp->v_bufobj; 372 vholdl(vp); 373 VI_UNLOCK(vp); 374 BO_LOCK(bo); 375 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 376 if (!BUF_ISLOCKED(bp) && 377 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 378 == (B_DELWRI | B_NEEDCOMMIT)) 379 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 380 } 381 BO_UNLOCK(bo); 382 vdrop(vp); 383 } 384 } 385 386 /* 387 * Called once to initialize data structures... 388 */ 389 int 390 ncl_init(struct vfsconf *vfsp) 391 { 392 int i; 393 394 /* Ensure async daemons disabled */ 395 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) { 396 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE; 397 ncl_iodmount[i] = NULL; 398 } 399 TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL); 400 ncl_nhinit(); /* Init the nfsnode table */ 401 402 return (0); 403 } 404 405