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_clsubs.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_subs.c 8.8 (Berkeley) 5/22/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD: releng/8.4/sys/fs/nfsclient/nfs_clsubs.c 224849 2011-08-13 17:19:24Z zack $"); 37 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/sysent.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 72 #include <netinet/in.h> 73 74 /* 75 * Note that stdarg.h and the ANSI style va_start macro is used for both 76 * ANSI and traditional C compilers. 77 */ 78 #include <machine/stdarg.h> 79 80 extern struct mtx ncl_iod_mutex; 81 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON]; 82 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON]; 83 extern int ncl_numasync; 84 extern unsigned int ncl_iodmax; 85 extern struct nfsstats newnfsstats; 86 87 struct task ncl_nfsiodnew_task; 88 89 int 90 ncl_uninit(struct vfsconf *vfsp) 91 { 92 /* 93 * XXX: Unloading of nfscl module is unsupported. 94 */ 95 #if 0 96 int i; 97 98 /* 99 * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup 100 * any sleeping nfsiods so they check ncl_iodmax and exit. 101 */ 102 mtx_lock(&ncl_iod_mutex); 103 ncl_iodmax = 0; 104 for (i = 0; i < ncl_numasync; i++) 105 if (ncl_iodwant[i] == NFSIOD_AVAILABLE) 106 wakeup(&ncl_iodwant[i]); 107 /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */ 108 while (ncl_numasync) 109 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0); 110 mtx_unlock(&ncl_iod_mutex); 111 ncl_nhuninit(); 112 return (0); 113 #else 114 return (EOPNOTSUPP); 115 #endif 116 } 117 118 void 119 ncl_dircookie_lock(struct nfsnode *np) 120 { 121 mtx_lock(&np->n_mtx); 122 while (np->n_flag & NDIRCOOKIELK) 123 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0); 124 np->n_flag |= NDIRCOOKIELK; 125 mtx_unlock(&np->n_mtx); 126 } 127 128 void 129 ncl_dircookie_unlock(struct nfsnode *np) 130 { 131 mtx_lock(&np->n_mtx); 132 np->n_flag &= ~NDIRCOOKIELK; 133 wakeup(&np->n_flag); 134 mtx_unlock(&np->n_mtx); 135 } 136 137 int 138 ncl_upgrade_vnlock(struct vnode *vp) 139 { 140 int old_lock; 141 142 ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock"); 143 old_lock = NFSVOPISLOCKED(vp); 144 if (old_lock != LK_EXCLUSIVE) { 145 KASSERT(old_lock == LK_SHARED, 146 ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock)); 147 /* Upgrade to exclusive lock, this might block */ 148 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 149 } 150 return (old_lock); 151 } 152 153 void 154 ncl_downgrade_vnlock(struct vnode *vp, int old_lock) 155 { 156 if (old_lock != LK_EXCLUSIVE) { 157 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock)); 158 /* Downgrade from exclusive lock. */ 159 NFSVOPLOCK(vp, LK_DOWNGRADE | LK_RETRY); 160 } 161 } 162 163 void 164 ncl_printf(const char *fmt, ...) 165 { 166 va_list ap; 167 168 mtx_lock(&Giant); 169 va_start(ap, fmt); 170 vprintf(fmt, ap); 171 va_end(ap); 172 mtx_unlock(&Giant); 173 } 174 175 #ifdef NFS_ACDEBUG 176 #include <sys/sysctl.h> 177 SYSCTL_DECL(_vfs_newnfs); 178 static int nfs_acdebug; 179 SYSCTL_INT(_vfs_newnfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); 180 #endif 181 182 /* 183 * Check the time stamp 184 * If the cache is valid, copy contents to *vap and return 0 185 * otherwise return an error 186 */ 187 int 188 ncl_getattrcache(struct vnode *vp, struct vattr *vaper) 189 { 190 struct nfsnode *np; 191 struct vattr *vap; 192 struct nfsmount *nmp; 193 int timeo, mustflush; 194 195 np = VTONFS(vp); 196 vap = &np->n_vattr.na_vattr; 197 nmp = VFSTONFS(vp->v_mount); 198 mustflush = nfscl_mustflush(vp); /* must be before mtx_lock() */ 199 #ifdef NFS_ACDEBUG 200 mtx_lock(&Giant); /* ncl_printf() */ 201 #endif 202 mtx_lock(&np->n_mtx); 203 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */ 204 timeo = (time_second - np->n_mtime.tv_sec) / 10; 205 206 #ifdef NFS_ACDEBUG 207 if (nfs_acdebug>1) 208 ncl_printf("nfs_getattrcache: initial timeo = %d\n", timeo); 209 #endif 210 211 if (vap->va_type == VDIR) { 212 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin) 213 timeo = nmp->nm_acdirmin; 214 else if (timeo > nmp->nm_acdirmax) 215 timeo = nmp->nm_acdirmax; 216 } else { 217 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin) 218 timeo = nmp->nm_acregmin; 219 else if (timeo > nmp->nm_acregmax) 220 timeo = nmp->nm_acregmax; 221 } 222 223 #ifdef NFS_ACDEBUG 224 if (nfs_acdebug > 2) 225 ncl_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n", 226 nmp->nm_acregmin, nmp->nm_acregmax, 227 nmp->nm_acdirmin, nmp->nm_acdirmax); 228 229 if (nfs_acdebug) 230 ncl_printf("nfs_getattrcache: age = %d; final timeo = %d\n", 231 (time_second - np->n_attrstamp), timeo); 232 #endif 233 234 if ((time_second - np->n_attrstamp) >= timeo && 235 (mustflush != 0 || np->n_attrstamp == 0)) { 236 newnfsstats.attrcache_misses++; 237 mtx_unlock(&np->n_mtx); 238 #ifdef NFS_ACDEBUG 239 mtx_unlock(&Giant); /* ncl_printf() */ 240 #endif 241 return( ENOENT); 242 } 243 newnfsstats.attrcache_hits++; 244 if (vap->va_size != np->n_size) { 245 if (vap->va_type == VREG) { 246 if (np->n_flag & NMODIFIED) { 247 if (vap->va_size < np->n_size) 248 vap->va_size = np->n_size; 249 else 250 np->n_size = vap->va_size; 251 } else { 252 np->n_size = vap->va_size; 253 } 254 vnode_pager_setsize(vp, np->n_size); 255 } else { 256 np->n_size = vap->va_size; 257 } 258 } 259 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); 260 if (np->n_flag & NCHG) { 261 if (np->n_flag & NACC) 262 vaper->va_atime = np->n_atim; 263 if (np->n_flag & NUPD) 264 vaper->va_mtime = np->n_mtim; 265 } 266 mtx_unlock(&np->n_mtx); 267 #ifdef NFS_ACDEBUG 268 mtx_unlock(&Giant); /* ncl_printf() */ 269 #endif 270 return (0); 271 } 272 273 static nfsuint64 nfs_nullcookie = { { 0, 0 } }; 274 /* 275 * This function finds the directory cookie that corresponds to the 276 * logical byte offset given. 277 */ 278 nfsuint64 * 279 ncl_getcookie(struct nfsnode *np, off_t off, int add) 280 { 281 struct nfsdmap *dp, *dp2; 282 int pos; 283 nfsuint64 *retval = NULL; 284 285 pos = (uoff_t)off / NFS_DIRBLKSIZ; 286 if (pos == 0 || off < 0) { 287 KASSERT(!add, ("nfs getcookie add at <= 0")); 288 return (&nfs_nullcookie); 289 } 290 pos--; 291 dp = LIST_FIRST(&np->n_cookies); 292 if (!dp) { 293 if (add) { 294 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap), 295 M_NFSDIROFF, M_WAITOK); 296 dp->ndm_eocookie = 0; 297 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); 298 } else 299 goto out; 300 } 301 while (pos >= NFSNUMCOOKIES) { 302 pos -= NFSNUMCOOKIES; 303 if (LIST_NEXT(dp, ndm_list)) { 304 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && 305 pos >= dp->ndm_eocookie) 306 goto out; 307 dp = LIST_NEXT(dp, ndm_list); 308 } else if (add) { 309 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap), 310 M_NFSDIROFF, M_WAITOK); 311 dp2->ndm_eocookie = 0; 312 LIST_INSERT_AFTER(dp, dp2, ndm_list); 313 dp = dp2; 314 } else 315 goto out; 316 } 317 if (pos >= dp->ndm_eocookie) { 318 if (add) 319 dp->ndm_eocookie = pos + 1; 320 else 321 goto out; 322 } 323 retval = &dp->ndm_cookies[pos]; 324 out: 325 return (retval); 326 } 327 328 /* 329 * Invalidate cached directory information, except for the actual directory 330 * blocks (which are invalidated separately). 331 * Done mainly to avoid the use of stale offset cookies. 332 */ 333 void 334 ncl_invaldir(struct vnode *vp) 335 { 336 struct nfsnode *np = VTONFS(vp); 337 338 KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir")); 339 ncl_dircookie_lock(np); 340 np->n_direofoffset = 0; 341 np->n_cookieverf.nfsuquad[0] = 0; 342 np->n_cookieverf.nfsuquad[1] = 0; 343 if (LIST_FIRST(&np->n_cookies)) 344 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0; 345 ncl_dircookie_unlock(np); 346 } 347 348 /* 349 * The write verifier has changed (probably due to a server reboot), so all 350 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the 351 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT 352 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the 353 * mount point. 354 * 355 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data 356 * writes are not clusterable. 357 */ 358 void 359 ncl_clearcommit(struct mount *mp) 360 { 361 struct vnode *vp, *nvp; 362 struct buf *bp, *nbp; 363 struct bufobj *bo; 364 365 MNT_ILOCK(mp); 366 MNT_VNODE_FOREACH(vp, mp, nvp) { 367 bo = &vp->v_bufobj; 368 VI_LOCK(vp); 369 if (vp->v_iflag & VI_DOOMED) { 370 VI_UNLOCK(vp); 371 continue; 372 } 373 vholdl(vp); 374 VI_UNLOCK(vp); 375 MNT_IUNLOCK(mp); 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 MNT_ILOCK(mp); 386 } 387 MNT_IUNLOCK(mp); 388 } 389 390 /* 391 * Called once to initialize data structures... 392 */ 393 int 394 ncl_init(struct vfsconf *vfsp) 395 { 396 int i; 397 398 /* Ensure async daemons disabled */ 399 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) { 400 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE; 401 ncl_iodmount[i] = NULL; 402 } 403 TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL); 404 ncl_nhinit(); /* Init the nfsnode table */ 405 406 return (0); 407 } 408
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