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