nfs_clsubs.c revision 1.1.1.1.10.2
1 /* $NetBSD: nfs_clsubs.c,v 1.1.1.1.10.2 2014/08/20 00:04:26 tls Exp $ */ 2 /*- 3 * Copyright (c) 1989, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Rick Macklem at The University of Guelph. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from nfs_subs.c 8.8 (Berkeley) 5/22/95 34 */ 35 36 #include <sys/cdefs.h> 37 /* __FBSDID("FreeBSD: head/sys/fs/nfsclient/nfs_clsubs.c 234386 2012-04-17 16:28:22Z mckusick "); */ 38 __RCSID("$NetBSD: nfs_clsubs.c,v 1.1.1.1.10.2 2014/08/20 00:04:26 tls Exp $"); 39 40 #include "opt_kdtrace.h" 41 42 /* 43 * These functions support the macros and help fiddle mbuf chains for 44 * the nfs op functions. They do things like create the rpc header and 45 * copy data between mbuf chains and uio lists. 46 */ 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/kernel.h> 51 #include <sys/bio.h> 52 #include <sys/buf.h> 53 #include <sys/proc.h> 54 #include <sys/mount.h> 55 #include <sys/vnode.h> 56 #include <sys/namei.h> 57 #include <sys/mbuf.h> 58 #include <sys/socket.h> 59 #include <sys/stat.h> 60 #include <sys/malloc.h> 61 #include <sys/sysent.h> 62 #include <sys/syscall.h> 63 #include <sys/sysproto.h> 64 #include <sys/taskqueue.h> 65 66 #include <vm/vm.h> 67 #include <vm/vm_object.h> 68 #include <vm/vm_extern.h> 69 #include <vm/uma.h> 70 71 #include <fs/nfs/nfsport.h> 72 #include <fs/nfsclient/nfsnode.h> 73 #include <fs/nfsclient/nfsmount.h> 74 #include <fs/nfsclient/nfs.h> 75 #include <fs/nfsclient/nfs_kdtrace.h> 76 77 #include <netinet/in.h> 78 79 /* 80 * Note that stdarg.h and the ANSI style va_start macro is used for both 81 * ANSI and traditional C compilers. 82 */ 83 #include <machine/stdarg.h> 84 85 extern struct mtx ncl_iod_mutex; 86 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON]; 87 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON]; 88 extern int ncl_numasync; 89 extern unsigned int ncl_iodmax; 90 extern struct nfsstats newnfsstats; 91 92 struct task ncl_nfsiodnew_task; 93 94 int 95 ncl_uninit(struct vfsconf *vfsp) 96 { 97 /* 98 * XXX: Unloading of nfscl module is unsupported. 99 */ 100 #if 0 101 int i; 102 103 /* 104 * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup 105 * any sleeping nfsiods so they check ncl_iodmax and exit. 106 */ 107 mtx_lock(&ncl_iod_mutex); 108 ncl_iodmax = 0; 109 for (i = 0; i < ncl_numasync; i++) 110 if (ncl_iodwant[i] == NFSIOD_AVAILABLE) 111 wakeup(&ncl_iodwant[i]); 112 /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */ 113 while (ncl_numasync) 114 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0); 115 mtx_unlock(&ncl_iod_mutex); 116 ncl_nhuninit(); 117 return (0); 118 #else 119 return (EOPNOTSUPP); 120 #endif 121 } 122 123 void 124 ncl_dircookie_lock(struct nfsnode *np) 125 { 126 mtx_lock(&np->n_mtx); 127 while (np->n_flag & NDIRCOOKIELK) 128 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0); 129 np->n_flag |= NDIRCOOKIELK; 130 mtx_unlock(&np->n_mtx); 131 } 132 133 void 134 ncl_dircookie_unlock(struct nfsnode *np) 135 { 136 mtx_lock(&np->n_mtx); 137 np->n_flag &= ~NDIRCOOKIELK; 138 wakeup(&np->n_flag); 139 mtx_unlock(&np->n_mtx); 140 } 141 142 int 143 ncl_upgrade_vnlock(struct vnode *vp) 144 { 145 int old_lock; 146 147 ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock"); 148 old_lock = NFSVOPISLOCKED(vp); 149 if (old_lock != LK_EXCLUSIVE) { 150 KASSERT(old_lock == LK_SHARED, 151 ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock)); 152 /* Upgrade to exclusive lock, this might block */ 153 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 154 } 155 return (old_lock); 156 } 157 158 void 159 ncl_downgrade_vnlock(struct vnode *vp, int old_lock) 160 { 161 if (old_lock != LK_EXCLUSIVE) { 162 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock)); 163 /* Downgrade from exclusive lock. */ 164 NFSVOPLOCK(vp, LK_DOWNGRADE | LK_RETRY); 165 } 166 } 167 168 void 169 ncl_printf(const char *fmt, ...) 170 { 171 va_list ap; 172 173 mtx_lock(&Giant); 174 va_start(ap, fmt); 175 vprintf(fmt, ap); 176 va_end(ap); 177 mtx_unlock(&Giant); 178 } 179 180 #ifdef NFS_ACDEBUG 181 #include <sys/sysctl.h> 182 SYSCTL_DECL(_vfs_nfs); 183 static int nfs_acdebug; 184 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); 185 #endif 186 187 /* 188 * Check the time stamp 189 * If the cache is valid, copy contents to *vap and return 0 190 * otherwise return an error 191 */ 192 int 193 ncl_getattrcache(struct vnode *vp, struct vattr *vaper) 194 { 195 struct nfsnode *np; 196 struct vattr *vap; 197 struct nfsmount *nmp; 198 int timeo, mustflush; 199 200 np = VTONFS(vp); 201 vap = &np->n_vattr.na_vattr; 202 nmp = VFSTONFS(vp->v_mount); 203 mustflush = nfscl_mustflush(vp); /* must be before mtx_lock() */ 204 #ifdef NFS_ACDEBUG 205 mtx_lock(&Giant); /* ncl_printf() */ 206 #endif 207 mtx_lock(&np->n_mtx); 208 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */ 209 timeo = (time_second - np->n_mtime.tv_sec) / 10; 210 211 #ifdef NFS_ACDEBUG 212 if (nfs_acdebug>1) 213 ncl_printf("nfs_getattrcache: initial timeo = %d\n", timeo); 214 #endif 215 216 if (vap->va_type == VDIR) { 217 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin) 218 timeo = nmp->nm_acdirmin; 219 else if (timeo > nmp->nm_acdirmax) 220 timeo = nmp->nm_acdirmax; 221 } else { 222 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin) 223 timeo = nmp->nm_acregmin; 224 else if (timeo > nmp->nm_acregmax) 225 timeo = nmp->nm_acregmax; 226 } 227 228 #ifdef NFS_ACDEBUG 229 if (nfs_acdebug > 2) 230 ncl_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n", 231 nmp->nm_acregmin, nmp->nm_acregmax, 232 nmp->nm_acdirmin, nmp->nm_acdirmax); 233 234 if (nfs_acdebug) 235 ncl_printf("nfs_getattrcache: age = %d; final timeo = %d\n", 236 (time_second - np->n_attrstamp), timeo); 237 #endif 238 239 if ((time_second - np->n_attrstamp) >= timeo && 240 (mustflush != 0 || np->n_attrstamp == 0)) { 241 newnfsstats.attrcache_misses++; 242 mtx_unlock(&np->n_mtx); 243 #ifdef NFS_ACDEBUG 244 mtx_unlock(&Giant); /* ncl_printf() */ 245 #endif 246 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp); 247 return( ENOENT); 248 } 249 newnfsstats.attrcache_hits++; 250 if (vap->va_size != np->n_size) { 251 if (vap->va_type == VREG) { 252 if (np->n_flag & NMODIFIED) { 253 if (vap->va_size < np->n_size) 254 vap->va_size = np->n_size; 255 else 256 np->n_size = vap->va_size; 257 } else { 258 np->n_size = vap->va_size; 259 } 260 vnode_pager_setsize(vp, np->n_size); 261 } else { 262 np->n_size = vap->va_size; 263 } 264 } 265 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); 266 if (np->n_flag & NCHG) { 267 if (np->n_flag & NACC) 268 vaper->va_atime = np->n_atim; 269 if (np->n_flag & NUPD) 270 vaper->va_mtime = np->n_mtim; 271 } 272 mtx_unlock(&np->n_mtx); 273 #ifdef NFS_ACDEBUG 274 mtx_unlock(&Giant); /* ncl_printf() */ 275 #endif 276 KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap); 277 return (0); 278 } 279 280 static nfsuint64 nfs_nullcookie = { { 0, 0 } }; 281 /* 282 * This function finds the directory cookie that corresponds to the 283 * logical byte offset given. 284 */ 285 nfsuint64 * 286 ncl_getcookie(struct nfsnode *np, off_t off, int add) 287 { 288 struct nfsdmap *dp, *dp2; 289 int pos; 290 nfsuint64 *retval = NULL; 291 292 pos = (uoff_t)off / NFS_DIRBLKSIZ; 293 if (pos == 0 || off < 0) { 294 KASSERT(!add, ("nfs getcookie add at <= 0")); 295 return (&nfs_nullcookie); 296 } 297 pos--; 298 dp = LIST_FIRST(&np->n_cookies); 299 if (!dp) { 300 if (add) { 301 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap), 302 M_NFSDIROFF, M_WAITOK); 303 dp->ndm_eocookie = 0; 304 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); 305 } else 306 goto out; 307 } 308 while (pos >= NFSNUMCOOKIES) { 309 pos -= NFSNUMCOOKIES; 310 if (LIST_NEXT(dp, ndm_list)) { 311 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && 312 pos >= dp->ndm_eocookie) 313 goto out; 314 dp = LIST_NEXT(dp, ndm_list); 315 } else if (add) { 316 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap), 317 M_NFSDIROFF, M_WAITOK); 318 dp2->ndm_eocookie = 0; 319 LIST_INSERT_AFTER(dp, dp2, ndm_list); 320 dp = dp2; 321 } else 322 goto out; 323 } 324 if (pos >= dp->ndm_eocookie) { 325 if (add) 326 dp->ndm_eocookie = pos + 1; 327 else 328 goto out; 329 } 330 retval = &dp->ndm_cookies[pos]; 331 out: 332 return (retval); 333 } 334 335 /* 336 * Invalidate cached directory information, except for the actual directory 337 * blocks (which are invalidated separately). 338 * Done mainly to avoid the use of stale offset cookies. 339 */ 340 void 341 ncl_invaldir(struct vnode *vp) 342 { 343 struct nfsnode *np = VTONFS(vp); 344 345 KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir")); 346 ncl_dircookie_lock(np); 347 np->n_direofoffset = 0; 348 np->n_cookieverf.nfsuquad[0] = 0; 349 np->n_cookieverf.nfsuquad[1] = 0; 350 if (LIST_FIRST(&np->n_cookies)) 351 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0; 352 ncl_dircookie_unlock(np); 353 } 354 355 /* 356 * The write verifier has changed (probably due to a server reboot), so all 357 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the 358 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT 359 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the 360 * mount point. 361 * 362 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data 363 * writes are not clusterable. 364 */ 365 void 366 ncl_clearcommit(struct mount *mp) 367 { 368 struct vnode *vp, *nvp; 369 struct buf *bp, *nbp; 370 struct bufobj *bo; 371 372 MNT_VNODE_FOREACH_ALL(vp, mp, nvp) { 373 bo = &vp->v_bufobj; 374 vholdl(vp); 375 VI_UNLOCK(vp); 376 BO_LOCK(bo); 377 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 378 if (!BUF_ISLOCKED(bp) && 379 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 380 == (B_DELWRI | B_NEEDCOMMIT)) 381 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 382 } 383 BO_UNLOCK(bo); 384 vdrop(vp); 385 } 386 } 387 388 /* 389 * Called once to initialize data structures... 390 */ 391 int 392 ncl_init(struct vfsconf *vfsp) 393 { 394 int i; 395 396 /* Ensure async daemons disabled */ 397 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) { 398 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE; 399 ncl_iodmount[i] = NULL; 400 } 401 TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL); 402 ncl_nhinit(); /* Init the nfsnode table */ 403 404 return (0); 405 } 406 407
Indexes created Thu Oct 02 10:09:58 GMT 2025