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 if ((old_lock = VOP_ISLOCKED(vp)) != LK_EXCLUSIVE) { 134 if (old_lock == LK_SHARED) { 135 /* Upgrade to exclusive lock, this might block */ 136 vn_lock(vp, LK_UPGRADE | LK_RETRY); 137 } else { 138 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 139 } 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 if (old_lock == LK_SHARED) { 149 /* Downgrade from exclusive lock, this might block */ 150 vn_lock(vp, LK_DOWNGRADE); 151 } else { 152 VOP_UNLOCK(vp, 0); 153 } 154 } 155 } 156 157 void 158 ncl_printf(const char *fmt, ...) 159 { 160 va_list ap; 161 162 mtx_lock(&Giant); 163 va_start(ap, fmt); 164 printf(fmt, ap); 165 va_end(ap); 166 mtx_unlock(&Giant); 167 } 168 169 #ifdef NFS_ACDEBUG 170 #include <sys/sysctl.h> 171 SYSCTL_DECL(_vfs_newnfs); 172 static int nfs_acdebug; 173 SYSCTL_INT(_vfs_newnfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); 174 #endif 175 176 /* 177 * Check the time stamp 178 * If the cache is valid, copy contents to *vap and return 0 179 * otherwise return an error 180 */ 181 int 182 ncl_getattrcache(struct vnode *vp, struct vattr *vaper) 183 { 184 struct nfsnode *np; 185 struct vattr *vap; 186 struct nfsmount *nmp; 187 int timeo; 188 189 np = VTONFS(vp); 190 vap = &np->n_vattr.na_vattr; 191 nmp = VFSTONFS(vp->v_mount); 192 #ifdef NFS_ACDEBUG 193 mtx_lock(&Giant); /* ncl_printf() */ 194 #endif 195 mtx_lock(&np->n_mtx); 196 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */ 197 timeo = (time_second - np->n_mtime.tv_sec) / 10; 198 199 #ifdef NFS_ACDEBUG 200 if (nfs_acdebug>1) 201 ncl_printf("nfs_getattrcache: initial timeo = %d\n", timeo); 202 #endif 203 204 if (vap->va_type == VDIR) { 205 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin) 206 timeo = nmp->nm_acdirmin; 207 else if (timeo > nmp->nm_acdirmax) 208 timeo = nmp->nm_acdirmax; 209 } else { 210 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin) 211 timeo = nmp->nm_acregmin; 212 else if (timeo > nmp->nm_acregmax) 213 timeo = nmp->nm_acregmax; 214 } 215 216 #ifdef NFS_ACDEBUG 217 if (nfs_acdebug > 2) 218 ncl_printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n", 219 nmp->nm_acregmin, nmp->nm_acregmax, 220 nmp->nm_acdirmin, nmp->nm_acdirmax); 221 222 if (nfs_acdebug) 223 ncl_printf("nfs_getattrcache: age = %d; final timeo = %d\n", 224 (time_second - np->n_attrstamp), timeo); 225 #endif 226 227 if ((time_second - np->n_attrstamp) >= timeo) { 228 newnfsstats.attrcache_misses++; 229 mtx_unlock(&np->n_mtx); 230 return( ENOENT); 231 } 232 newnfsstats.attrcache_hits++; 233 if (vap->va_size != np->n_size) { 234 if (vap->va_type == VREG) { 235 if (np->n_flag & NMODIFIED) { 236 if (vap->va_size < np->n_size) 237 vap->va_size = np->n_size; 238 else 239 np->n_size = vap->va_size; 240 } else { 241 np->n_size = vap->va_size; 242 } 243 vnode_pager_setsize(vp, np->n_size); 244 } else { 245 np->n_size = vap->va_size; 246 } 247 } 248 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); 249 if (np->n_flag & NCHG) { 250 if (np->n_flag & NACC) 251 vaper->va_atime = np->n_atim; 252 if (np->n_flag & NUPD) 253 vaper->va_mtime = np->n_mtim; 254 } 255 mtx_unlock(&np->n_mtx); 256 #ifdef NFS_ACDEBUG 257 mtx_unlock(&Giant); /* ncl_printf() */ 258 #endif 259 return (0); 260 } 261 262 static nfsuint64 nfs_nullcookie = { { 0, 0 } }; 263 /* 264 * This function finds the directory cookie that corresponds to the 265 * logical byte offset given. 266 */ 267 nfsuint64 * 268 ncl_getcookie(struct nfsnode *np, off_t off, int add) 269 { 270 struct nfsdmap *dp, *dp2; 271 int pos; 272 nfsuint64 *retval = NULL; 273 274 pos = (uoff_t)off / NFS_DIRBLKSIZ; 275 if (pos == 0 || off < 0) { 276 #ifdef DIAGNOSTIC 277 if (add) 278 panic("nfs getcookie add at <= 0"); 279 #endif 280 return (&nfs_nullcookie); 281 } 282 pos--; 283 dp = LIST_FIRST(&np->n_cookies); 284 if (!dp) { 285 if (add) { 286 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap), 287 M_NFSDIROFF, M_WAITOK); 288 dp->ndm_eocookie = 0; 289 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); 290 } else 291 goto out; 292 } 293 while (pos >= NFSNUMCOOKIES) { 294 pos -= NFSNUMCOOKIES; 295 if (LIST_NEXT(dp, ndm_list)) { 296 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && 297 pos >= dp->ndm_eocookie) 298 goto out; 299 dp = LIST_NEXT(dp, ndm_list); 300 } else if (add) { 301 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap), 302 M_NFSDIROFF, M_WAITOK); 303 dp2->ndm_eocookie = 0; 304 LIST_INSERT_AFTER(dp, dp2, ndm_list); 305 dp = dp2; 306 } else 307 goto out; 308 } 309 if (pos >= dp->ndm_eocookie) { 310 if (add) 311 dp->ndm_eocookie = pos + 1; 312 else 313 goto out; 314 } 315 retval = &dp->ndm_cookies[pos]; 316 out: 317 return (retval); 318 } 319 320 /* 321 * Invalidate cached directory information, except for the actual directory 322 * blocks (which are invalidated separately). 323 * Done mainly to avoid the use of stale offset cookies. 324 */ 325 void 326 ncl_invaldir(struct vnode *vp) 327 { 328 struct nfsnode *np = VTONFS(vp); 329 330 #ifdef DIAGNOSTIC 331 if (vp->v_type != VDIR) 332 panic("nfs: invaldir not dir"); 333 #endif 334 ncl_dircookie_lock(np); 335 np->n_direofoffset = 0; 336 np->n_cookieverf.nfsuquad[0] = 0; 337 np->n_cookieverf.nfsuquad[1] = 0; 338 if (LIST_FIRST(&np->n_cookies)) 339 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0; 340 ncl_dircookie_unlock(np); 341 } 342 343 /* 344 * The write verifier has changed (probably due to a server reboot), so all 345 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the 346 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT 347 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the 348 * mount point. 349 * 350 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data 351 * writes are not clusterable. 352 */ 353 void 354 ncl_clearcommit(struct mount *mp) 355 { 356 struct vnode *vp, *nvp; 357 struct buf *bp, *nbp; 358 struct bufobj *bo; 359 360 MNT_ILOCK(mp); 361 MNT_VNODE_FOREACH(vp, mp, nvp) { 362 bo = &vp->v_bufobj; 363 VI_LOCK(vp); 364 if (vp->v_iflag & VI_DOOMED) { 365 VI_UNLOCK(vp); 366 continue; 367 } 368 vholdl(vp); 369 VI_UNLOCK(vp); 370 MNT_IUNLOCK(mp); 371 BO_LOCK(bo); 372 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 373 if (!BUF_ISLOCKED(bp) && 374 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 375 == (B_DELWRI | B_NEEDCOMMIT)) 376 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 377 } 378 BO_UNLOCK(bo); 379 vdrop(vp); 380 MNT_ILOCK(mp); 381 } 382 MNT_IUNLOCK(mp); 383 } 384 385 /* 386 * Called once to initialize data structures... 387 */ 388 int 389 ncl_init(struct vfsconf *vfsp) 390 { 391 int i; 392 393 /* Ensure async daemons disabled */ 394 for (i = 0; i < NFS_MAXRAHEAD; i++) { 395 ncl_iodwant[i] = NULL; 396 ncl_iodmount[i] = NULL; 397 } 398 ncl_nhinit(); /* Init the nfsnode table */ 399 400 return (0); 401 } 402 403