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/11.0/sys/fs/nfsclient/nfs_clsubs.c 303909 2016-08-10 12:53:30Z kib $"); 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 #include <fs/nfsclient/nfs_kdtrace.h> 72 73 #include <netinet/in.h> 74 75 /* 76 * Note that stdarg.h and the ANSI style va_start macro is used for both 77 * ANSI and traditional C compilers. 78 */ 79 #include <machine/stdarg.h> 80 81 extern struct mtx ncl_iod_mutex; 82 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON]; 83 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON]; 84 extern int ncl_numasync; 85 extern unsigned int ncl_iodmax; 86 extern struct nfsstats newnfsstats; 87 88 struct task ncl_nfsiodnew_task; 89 90 int 91 ncl_uninit(struct vfsconf *vfsp) 92 { 93 /* 94 * XXX: Unloading of nfscl module is unsupported. 95 */ 96 #if 0 97 int i; 98 99 /* 100 * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup 101 * any sleeping nfsiods so they check ncl_iodmax and exit. 102 */ 103 mtx_lock(&ncl_iod_mutex); 104 ncl_iodmax = 0; 105 for (i = 0; i < ncl_numasync; i++) 106 if (ncl_iodwant[i] == NFSIOD_AVAILABLE) 107 wakeup(&ncl_iodwant[i]); 108 /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */ 109 while (ncl_numasync) 110 msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0); 111 mtx_unlock(&ncl_iod_mutex); 112 ncl_nhuninit(); 113 return (0); 114 #else 115 return (EOPNOTSUPP); 116 #endif 117 } 118 119 void 120 ncl_dircookie_lock(struct nfsnode *np) 121 { 122 mtx_lock(&np->n_mtx); 123 while (np->n_flag & NDIRCOOKIELK) 124 (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0); 125 np->n_flag |= NDIRCOOKIELK; 126 mtx_unlock(&np->n_mtx); 127 } 128 129 void 130 ncl_dircookie_unlock(struct nfsnode *np) 131 { 132 mtx_lock(&np->n_mtx); 133 np->n_flag &= ~NDIRCOOKIELK; 134 wakeup(&np->n_flag); 135 mtx_unlock(&np->n_mtx); 136 } 137 138 int 139 ncl_upgrade_vnlock(struct vnode *vp) 140 { 141 int old_lock; 142 143 ASSERT_VOP_LOCKED(vp, "ncl_upgrade_vnlock"); 144 old_lock = NFSVOPISLOCKED(vp); 145 if (old_lock != LK_EXCLUSIVE) { 146 KASSERT(old_lock == LK_SHARED, 147 ("ncl_upgrade_vnlock: wrong old_lock %d", old_lock)); 148 /* Upgrade to exclusive lock, this might block */ 149 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 150 } 151 return (old_lock); 152 } 153 154 void 155 ncl_downgrade_vnlock(struct vnode *vp, int old_lock) 156 { 157 if (old_lock != LK_EXCLUSIVE) { 158 KASSERT(old_lock == LK_SHARED, ("wrong old_lock %d", old_lock)); 159 /* Downgrade from exclusive lock. */ 160 NFSVOPLOCK(vp, LK_DOWNGRADE | LK_RETRY); 161 } 162 } 163 164 #ifdef NFS_ACDEBUG 165 #include <sys/sysctl.h> 166 SYSCTL_DECL(_vfs_nfs); 167 static int nfs_acdebug; 168 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); 169 #endif 170 171 /* 172 * Check the time stamp 173 * If the cache is valid, copy contents to *vap and return 0 174 * otherwise return an error 175 */ 176 int 177 ncl_getattrcache(struct vnode *vp, struct vattr *vaper) 178 { 179 struct nfsnode *np; 180 struct vattr *vap; 181 struct nfsmount *nmp; 182 int timeo, mustflush; 183 184 np = VTONFS(vp); 185 vap = &np->n_vattr.na_vattr; 186 nmp = VFSTONFS(vp->v_mount); 187 mustflush = nfscl_mustflush(vp); /* must be before mtx_lock() */ 188 mtx_lock(&np->n_mtx); 189 /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */ 190 timeo = (time_second - np->n_mtime.tv_sec) / 10; 191 192 #ifdef NFS_ACDEBUG 193 if (nfs_acdebug>1) 194 printf("ncl_getattrcache: initial timeo = %d\n", timeo); 195 #endif 196 197 if (vap->va_type == VDIR) { 198 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin) 199 timeo = nmp->nm_acdirmin; 200 else if (timeo > nmp->nm_acdirmax) 201 timeo = nmp->nm_acdirmax; 202 } else { 203 if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin) 204 timeo = nmp->nm_acregmin; 205 else if (timeo > nmp->nm_acregmax) 206 timeo = nmp->nm_acregmax; 207 } 208 209 #ifdef NFS_ACDEBUG 210 if (nfs_acdebug > 2) 211 printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n", 212 nmp->nm_acregmin, nmp->nm_acregmax, 213 nmp->nm_acdirmin, nmp->nm_acdirmax); 214 215 if (nfs_acdebug) 216 printf("ncl_getattrcache: age = %d; final timeo = %d\n", 217 (time_second - np->n_attrstamp), timeo); 218 #endif 219 220 if ((time_second - np->n_attrstamp) >= timeo && 221 (mustflush != 0 || np->n_attrstamp == 0)) { 222 newnfsstats.attrcache_misses++; 223 mtx_unlock(&np->n_mtx); 224 KDTRACE_NFS_ATTRCACHE_GET_MISS(vp); 225 return( ENOENT); 226 } 227 newnfsstats.attrcache_hits++; 228 if (vap->va_size != np->n_size) { 229 if (vap->va_type == VREG) { 230 if (np->n_flag & NMODIFIED) { 231 if (vap->va_size < np->n_size) 232 vap->va_size = np->n_size; 233 else 234 np->n_size = vap->va_size; 235 } else { 236 np->n_size = vap->va_size; 237 } 238 vnode_pager_setsize(vp, np->n_size); 239 } else { 240 np->n_size = vap->va_size; 241 } 242 } 243 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); 244 if (np->n_flag & NCHG) { 245 if (np->n_flag & NACC) 246 vaper->va_atime = np->n_atim; 247 if (np->n_flag & NUPD) 248 vaper->va_mtime = np->n_mtim; 249 } 250 mtx_unlock(&np->n_mtx); 251 KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap); 252 return (0); 253 } 254 255 static nfsuint64 nfs_nullcookie = { { 0, 0 } }; 256 /* 257 * This function finds the directory cookie that corresponds to the 258 * logical byte offset given. 259 */ 260 nfsuint64 * 261 ncl_getcookie(struct nfsnode *np, off_t off, int add) 262 { 263 struct nfsdmap *dp, *dp2; 264 int pos; 265 nfsuint64 *retval = NULL; 266 267 pos = (uoff_t)off / NFS_DIRBLKSIZ; 268 if (pos == 0 || off < 0) { 269 KASSERT(!add, ("nfs getcookie add at <= 0")); 270 return (&nfs_nullcookie); 271 } 272 pos--; 273 dp = LIST_FIRST(&np->n_cookies); 274 if (!dp) { 275 if (add) { 276 MALLOC(dp, struct nfsdmap *, sizeof (struct nfsdmap), 277 M_NFSDIROFF, M_WAITOK); 278 dp->ndm_eocookie = 0; 279 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); 280 } else 281 goto out; 282 } 283 while (pos >= NFSNUMCOOKIES) { 284 pos -= NFSNUMCOOKIES; 285 if (LIST_NEXT(dp, ndm_list)) { 286 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && 287 pos >= dp->ndm_eocookie) 288 goto out; 289 dp = LIST_NEXT(dp, ndm_list); 290 } else if (add) { 291 MALLOC(dp2, struct nfsdmap *, sizeof (struct nfsdmap), 292 M_NFSDIROFF, M_WAITOK); 293 dp2->ndm_eocookie = 0; 294 LIST_INSERT_AFTER(dp, dp2, ndm_list); 295 dp = dp2; 296 } else 297 goto out; 298 } 299 if (pos >= dp->ndm_eocookie) { 300 if (add) 301 dp->ndm_eocookie = pos + 1; 302 else 303 goto out; 304 } 305 retval = &dp->ndm_cookies[pos]; 306 out: 307 return (retval); 308 } 309 310 /* 311 * Invalidate cached directory information, except for the actual directory 312 * blocks (which are invalidated separately). 313 * Done mainly to avoid the use of stale offset cookies. 314 */ 315 void 316 ncl_invaldir(struct vnode *vp) 317 { 318 struct nfsnode *np = VTONFS(vp); 319 320 KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir")); 321 ncl_dircookie_lock(np); 322 np->n_direofoffset = 0; 323 np->n_cookieverf.nfsuquad[0] = 0; 324 np->n_cookieverf.nfsuquad[1] = 0; 325 if (LIST_FIRST(&np->n_cookies)) 326 LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0; 327 ncl_dircookie_unlock(np); 328 } 329 330 /* 331 * The write verifier has changed (probably due to a server reboot), so all 332 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the 333 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT 334 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the 335 * mount point. 336 * 337 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data 338 * writes are not clusterable. 339 */ 340 void 341 ncl_clearcommit(struct mount *mp) 342 { 343 struct vnode *vp, *nvp; 344 struct buf *bp, *nbp; 345 struct bufobj *bo; 346 347 MNT_VNODE_FOREACH_ALL(vp, mp, nvp) { 348 bo = &vp->v_bufobj; 349 vholdl(vp); 350 VI_UNLOCK(vp); 351 BO_LOCK(bo); 352 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 353 if (!BUF_ISLOCKED(bp) && 354 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 355 == (B_DELWRI | B_NEEDCOMMIT)) 356 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 357 } 358 BO_UNLOCK(bo); 359 vdrop(vp); 360 } 361 } 362 363 /* 364 * Called once to initialize data structures... 365 */ 366 int 367 ncl_init(struct vfsconf *vfsp) 368 { 369 int i; 370 371 /* Ensure async daemons disabled */ 372 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) { 373 ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE; 374 ncl_iodmount[i] = NULL; 375 } 376 TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL); 377 ncl_nhinit(); /* Init the nfsnode table */ 378 379 return (0); 380 } 381
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