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 #include <fs/nfsclient/nfs_lock.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_MAXRAHEAD]; 82 extern struct nfsmount *ncl_iodmount[NFS_MAXRAHEAD]; 83 extern int ncl_numasync; 84 extern unsigned int ncl_iodmax; 85 extern struct nfsstats newnfsstats; 86 87 int 88 ncl_uninit(struct vfsconf *vfsp) 89 { 90 /* 91 * XXX: Unloading of nfscl module is unsupported. 92 */ 93 #if 0 94 int i; 95 96 /* 97 * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup 98 * any sleeping nfsiods so they check ncl_iodmax and exit. 99 */ 100 mtx_lock(&ncl_iod_mutex); 101 ncl_iodmax = 0; 102 for (i = 0; i < ncl_numasync; i++) 103 if (ncl_iodwant[i] == NFSIOD_AVAILABLE) 104 wakeup(&ncl_iodwant[i]); 105 /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */ 106 while (ncl_numasync) 107 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0); 108 mtx_unlock(&ncl_iod_mutex); 109 ncl_nhuninit(); 110 return (0); 111 #else 112 return (EOPNOTSUPP); 113 #endif 114 } 115 116 void 117 ncl_dircookie_lock(struct nfsnode *np) 118 { 119 mtx_lock(&np->n_mtx); 120 while (np->n_flag & NDIRCOOKIELK) 121 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0); 122 np->n_flag |= NDIRCOOKIELK; 123 mtx_unlock(&np->n_mtx); 124 } 125 126 void 127 ncl_dircookie_unlock(struct nfsnode *np) 128 { 129 mtx_lock(&np->n_mtx); 130 np->n_flag &= ~NDIRCOOKIELK; 131 wakeup(&np->n_flag); 132 mtx_unlock(&np->n_mtx); 133 } 134 135 int 136 ncl_upgrade_vnlock(struct vnode *vp) 137 { 138 int old_lock; 139 140 ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock"); 141 old_lock = VOP_ISLOCKED(vp); 142 if (old_lock != LK_EXCLUSIVE) { 143 KASSERT(old_lock == LK_SHARED, 144 ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock)); 145 /* Upgrade to exclusive lock, this might block */ 146 vn_lock(vp, LK_UPGRADE | LK_RETRY); 147 } 148 return (old_lock); 149 } 150 151 void 152 ncl_downgrade_vnlock(struct vnode *vp, int old_lock) 153 { 154 if (old_lock != LK_EXCLUSIVE) { 155 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock)); 156 /* Downgrade from exclusive lock. */ 157 vn_lock(vp, LK_DOWNGRADE | LK_RETRY); 158 } 159 } 160 161 void 162 ncl_printf(const char *fmt, ...) 163 { 164 va_list ap; 165 166 mtx_lock(&Giant); 167 va_start(ap, fmt); 168 printf(fmt, ap); 169 va_end(ap); 170 mtx_unlock(&Giant); 171 } 172 173 #ifdef NFS_ACDEBUG 174 #include <sys/sysctl.h> 175 SYSCTL_DECL(_vfs_newnfs); 176 static int nfs_acdebug; 177 SYSCTL_INT(_vfs_newnfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); 178 #endif 179 180 /* 181 * Check the time stamp 182 * If the cache is valid, copy contents to *vap and return 0 183 * otherwise return an error 184 */ 185 int 186 ncl_getattrcache(struct vnode *vp, struct vattr *vaper) 187 { 188 struct nfsnode *np; 189 struct vattr *vap; 190 struct nfsmount *nmp; 191 int timeo; 192 193 np = VTONFS(vp); 194 vap = &np->n_vattr.na_vattr; 195 nmp = VFSTONFS(vp->v_mount); 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 newnfsstats.attrcache_misses++; 233 mtx_unlock(&np->n_mtx); 234 return( ENOENT); 235 } 236 newnfsstats.attrcache_hits++; 237 if (vap->va_size != np->n_size) { 238 if (vap->va_type == VREG) { 239 if (np->n_flag & NMODIFIED) { 240 if (vap->va_size < np->n_size) 241 vap->va_size = np->n_size; 242 else 243 np->n_size = vap->va_size; 244 } else { 245 np->n_size = vap->va_size; 246 } 247 vnode_pager_setsize(vp, np->n_size); 248 } else { 249 np->n_size = vap->va_size; 250 } 251 } 252 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); 253 if (np->n_flag & NCHG) { 254 if (np->n_flag & NACC) 255 vaper->va_atime = np->n_atim; 256 if (np->n_flag & NUPD) 257 vaper->va_mtime = np->n_mtim; 258 } 259 mtx_unlock(&np->n_mtx); 260 #ifdef NFS_ACDEBUG 261 mtx_unlock(&Giant); /* ncl_printf() */ 262 #endif 263 return (0); 264 } 265 266 static nfsuint64 nfs_nullcookie = { { 0, 0 } }; 267 /* 268 * This function finds the directory cookie that corresponds to the 269 * logical byte offset given. 270 */ 271 nfsuint64 * 272 ncl_getcookie(struct nfsnode *np, off_t off, int add) 273 { 274 struct nfsdmap *dp, *dp2; 275 int pos; 276 nfsuint64 *retval = NULL; 277 278 pos = (uoff_t)off / NFS_DIRBLKSIZ; 279 if (pos == 0 || off < 0) { 280 #ifdef DIAGNOSTIC 281 if (add) 282 panic("nfs getcookie add at <= 0"); 283 #endif 284 return (&nfs_nullcookie); 285 } 286 pos--; 287 dp = LIST_FIRST(&np->n_cookies); 288 if (!dp) { 289 if (add) { 290 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap), 291 M_NFSDIROFF, M_WAITOK); 292 dp->ndm_eocookie = 0; 293 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); 294 } else 295 goto out; 296 } 297 while (pos >= NFSNUMCOOKIES) { 298 pos -= NFSNUMCOOKIES; 299 if (LIST_NEXT(dp, ndm_list)) { 300 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && 301 pos >= dp->ndm_eocookie) 302 goto out; 303 dp = LIST_NEXT(dp, ndm_list); 304 } else if (add) { 305 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap), 306 M_NFSDIROFF, M_WAITOK); 307 dp2->ndm_eocookie = 0; 308 LIST_INSERT_AFTER(dp, dp2, ndm_list); 309 dp = dp2; 310 } else 311 goto out; 312 } 313 if (pos >= dp->ndm_eocookie) { 314 if (add) 315 dp->ndm_eocookie = pos + 1; 316 else 317 goto out; 318 } 319 retval = &dp->ndm_cookies[pos]; 320 out: 321 return (retval); 322 } 323 324 /* 325 * Invalidate cached directory information, except for the actual directory 326 * blocks (which are invalidated separately). 327 * Done mainly to avoid the use of stale offset cookies. 328 */ 329 void 330 ncl_invaldir(struct vnode *vp) 331 { 332 struct nfsnode *np = VTONFS(vp); 333 334 #ifdef DIAGNOSTIC 335 if (vp->v_type != VDIR) 336 panic("nfs: invaldir not dir"); 337 #endif 338 ncl_dircookie_lock(np); 339 np->n_direofoffset = 0; 340 np->n_cookieverf.nfsuquad[0] = 0; 341 np->n_cookieverf.nfsuquad[1] = 0; 342 if (LIST_FIRST(&np->n_cookies)) 343 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0; 344 ncl_dircookie_unlock(np); 345 } 346 347 /* 348 * The write verifier has changed (probably due to a server reboot), so all 349 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the 350 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT 351 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the 352 * mount point. 353 * 354 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data 355 * writes are not clusterable. 356 */ 357 void 358 ncl_clearcommit(struct mount *mp) 359 { 360 struct vnode *vp, *nvp; 361 struct buf *bp, *nbp; 362 struct bufobj *bo; 363 364 MNT_ILOCK(mp); 365 MNT_VNODE_FOREACH(vp, mp, nvp) { 366 bo = &vp->v_bufobj; 367 VI_LOCK(vp); 368 if (vp->v_iflag & VI_DOOMED) { 369 VI_UNLOCK(vp); 370 continue; 371 } 372 vholdl(vp); 373 VI_UNLOCK(vp); 374 MNT_IUNLOCK(mp); 375 BO_LOCK(bo); 376 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 377 if (!BUF_ISLOCKED(bp) && 378 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 379 == (B_DELWRI | B_NEEDCOMMIT)) 380 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 381 } 382 BO_UNLOCK(bo); 383 vdrop(vp); 384 MNT_ILOCK(mp); 385 } 386 MNT_IUNLOCK(mp); 387 } 388 389 /* 390 * Called once to initialize data structures... 391 */ 392 int 393 ncl_init(struct vfsconf *vfsp) 394 { 395 int i; 396 397 /* Ensure async daemons disabled */ 398 for (i = 0; i < NFS_MAXRAHEAD; i++) { 399 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE; 400 ncl_iodmount[i] = NULL; 401 } 402 ncl_nhinit(); /* Init the nfsnode table */ 403 404 return (0); 405 } 406 407