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