nfs_vfsops.c revision 1.220.12.2
1 /* $NetBSD: nfs_vfsops.c,v 1.220.12.2 2014/08/20 00:04:36 tls Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.220.12.2 2014/08/20 00:04:36 tls Exp $"); 39 40 #if defined(_KERNEL_OPT) 41 #include "opt_nfs.h" 42 #endif 43 44 #include <sys/param.h> 45 #include <sys/ioctl.h> 46 #include <sys/signal.h> 47 #include <sys/proc.h> 48 #include <sys/namei.h> 49 #include <sys/device.h> 50 #include <sys/vnode.h> 51 #include <sys/kernel.h> 52 #include <sys/mount.h> 53 #include <sys/buf.h> 54 #include <sys/mbuf.h> 55 #include <sys/dirent.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/sysctl.h> 59 #include <sys/systm.h> 60 #include <sys/timetc.h> 61 #include <sys/kauth.h> 62 #include <sys/module.h> 63 64 #include <net/if.h> 65 #include <net/route.h> 66 #include <netinet/in.h> 67 68 #include <nfs/rpcv2.h> 69 #include <nfs/nfsproto.h> 70 #include <nfs/nfsnode.h> 71 #include <nfs/nfs.h> 72 #include <nfs/nfsmount.h> 73 #include <nfs/xdr_subs.h> 74 #include <nfs/nfsm_subs.h> 75 #include <nfs/nfsdiskless.h> 76 #include <nfs/nfs_var.h> 77 78 MODULE(MODULE_CLASS_VFS, nfs, NULL); 79 80 extern struct nfsstats nfsstats; 81 extern int nfs_ticks; 82 83 /* 84 * keep a count of the nfs mounts to generate ficticious drive names 85 * for the per drive stats. 86 */ 87 unsigned int nfs_mount_count = 0; 88 89 int nfs_commitsize; 90 91 /* 92 * nfs vfs operations. 93 */ 94 95 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 96 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 97 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 98 99 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 100 &nfsv2_vnodeop_opv_desc, 101 &spec_nfsv2nodeop_opv_desc, 102 &fifo_nfsv2nodeop_opv_desc, 103 NULL, 104 }; 105 106 struct vfsops nfs_vfsops = { 107 .vfs_name = MOUNT_NFS, 108 .vfs_min_mount_data = sizeof (struct nfs_args), 109 .vfs_mount = nfs_mount, 110 .vfs_start = nfs_start, 111 .vfs_unmount = nfs_unmount, 112 .vfs_root = nfs_root, 113 .vfs_quotactl = (void *)eopnotsupp, 114 .vfs_statvfs = nfs_statvfs, 115 .vfs_sync = nfs_sync, 116 .vfs_loadvnode = nfs_loadvnode, 117 .vfs_vget = nfs_vget, 118 .vfs_fhtovp = nfs_fhtovp, 119 .vfs_vptofh = nfs_vptofh, 120 .vfs_init = nfs_vfs_init, 121 .vfs_done = nfs_vfs_done, 122 .vfs_mountroot = nfs_mountroot, 123 .vfs_snapshot = (void *)eopnotsupp, 124 .vfs_extattrctl = vfs_stdextattrctl, 125 .vfs_suspendctl = (void *)eopnotsupp, 126 .vfs_renamelock_enter = genfs_renamelock_enter, 127 .vfs_renamelock_exit = genfs_renamelock_exit, 128 .vfs_fsync = (void *)eopnotsupp, 129 .vfs_opv_descs = nfs_vnodeopv_descs 130 }; 131 132 extern u_int32_t nfs_procids[NFS_NPROCS]; 133 extern u_int32_t nfs_prog, nfs_vers; 134 static struct sysctllog *nfs_clog; 135 136 static int nfs_mount_diskless(struct nfs_dlmount *, const char *, 137 struct mount **, struct vnode **, struct lwp *); 138 static void nfs_sysctl_init(void); 139 static void nfs_sysctl_fini(void); 140 141 static int 142 nfs_modcmd(modcmd_t cmd, void *arg) 143 { 144 int error; 145 146 switch (cmd) { 147 case MODULE_CMD_INIT: 148 error = vfs_attach(&nfs_vfsops); 149 if (error == 0) { 150 nfs_sysctl_init(); 151 } 152 return error; 153 case MODULE_CMD_FINI: 154 error = vfs_detach(&nfs_vfsops); 155 if (error == 0) { 156 nfs_sysctl_fini(); 157 } 158 return error; 159 default: 160 return ENOTTY; 161 } 162 } 163 164 /* 165 * nfs statvfs call 166 */ 167 int 168 nfs_statvfs(struct mount *mp, struct statvfs *sbp) 169 { 170 struct lwp *l = curlwp; 171 struct vnode *vp; 172 struct nfs_statfs *sfp; 173 char *cp; 174 u_int32_t *tl; 175 int32_t t1, t2; 176 char *bpos, *dpos, *cp2; 177 struct nfsmount *nmp = VFSTONFS(mp); 178 int error = 0, retattr; 179 #ifdef NFS_V2_ONLY 180 const int v3 = 0; 181 #else 182 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 183 #endif 184 struct mbuf *mreq, *mrep = NULL, *md, *mb; 185 kauth_cred_t cred; 186 u_quad_t tquad; 187 struct nfsnode *np; 188 189 #ifndef nolint 190 sfp = (struct nfs_statfs *)0; 191 #endif 192 vp = nmp->nm_vnode; 193 np = VTONFS(vp); 194 cred = kauth_cred_alloc(); 195 #ifndef NFS_V2_ONLY 196 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 197 (void)nfs_fsinfo(nmp, vp, cred, l); 198 #endif 199 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 200 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 201 nfsm_fhtom(np, v3); 202 nfsm_request(np, NFSPROC_FSSTAT, l, cred); 203 if (v3) 204 nfsm_postop_attr(vp, retattr, 0); 205 if (error) { 206 if (mrep != NULL) { 207 if (mrep->m_next != NULL) 208 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 209 m_freem(mrep); 210 } 211 goto nfsmout; 212 } 213 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 214 sbp->f_flag = nmp->nm_flag; 215 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 216 if (v3) { 217 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 218 tquad = fxdr_hyper(&sfp->sf_tbytes); 219 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 220 tquad = fxdr_hyper(&sfp->sf_fbytes); 221 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 222 tquad = fxdr_hyper(&sfp->sf_abytes); 223 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 224 sbp->f_bresvd = sbp->f_bfree - tquad; 225 sbp->f_bavail = tquad; 226 /* Handle older NFS servers returning negative values */ 227 if ((quad_t)sbp->f_bavail < 0) 228 sbp->f_bavail = 0; 229 tquad = fxdr_hyper(&sfp->sf_tfiles); 230 sbp->f_files = tquad; 231 tquad = fxdr_hyper(&sfp->sf_ffiles); 232 sbp->f_ffree = tquad; 233 sbp->f_favail = tquad; 234 sbp->f_fresvd = 0; 235 sbp->f_namemax = NFS_MAXNAMLEN; 236 } else { 237 sbp->f_bsize = NFS_FABLKSIZE; 238 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 239 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 240 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 241 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 242 sbp->f_fresvd = 0; 243 sbp->f_files = 0; 244 sbp->f_ffree = 0; 245 sbp->f_favail = 0; 246 sbp->f_fresvd = 0; 247 sbp->f_namemax = NFS_MAXNAMLEN; 248 } 249 copy_statvfs_info(sbp, mp); 250 nfsm_reqdone; 251 kauth_cred_free(cred); 252 return (error); 253 } 254 255 #ifndef NFS_V2_ONLY 256 /* 257 * nfs version 3 fsinfo rpc call 258 */ 259 int 260 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, kauth_cred_t cred, struct lwp *l) 261 { 262 struct nfsv3_fsinfo *fsp; 263 char *cp; 264 int32_t t1, t2; 265 u_int32_t *tl, pref, xmax; 266 char *bpos, *dpos, *cp2; 267 int error = 0, retattr; 268 struct mbuf *mreq, *mrep, *md, *mb; 269 u_int64_t maxfsize; 270 struct nfsnode *np = VTONFS(vp); 271 272 nfsstats.rpccnt[NFSPROC_FSINFO]++; 273 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 274 nfsm_fhtom(np, 1); 275 nfsm_request(np, NFSPROC_FSINFO, l, cred); 276 nfsm_postop_attr(vp, retattr, 0); 277 if (!error) { 278 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 279 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 280 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 281 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 282 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 283 ~(NFS_FABLKSIZE - 1); 284 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 285 if (xmax < nmp->nm_wsize && xmax > 0) { 286 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1); 287 if (nmp->nm_wsize == 0) 288 nmp->nm_wsize = xmax; 289 } 290 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 291 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 292 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 293 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 294 ~(NFS_FABLKSIZE - 1); 295 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 296 if (xmax < nmp->nm_rsize && xmax > 0) { 297 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1); 298 if (nmp->nm_rsize == 0) 299 nmp->nm_rsize = xmax; 300 } 301 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 302 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 303 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 304 ~(NFS_DIRFRAGSIZ - 1); 305 if (xmax < nmp->nm_readdirsize && xmax > 0) { 306 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1); 307 if (nmp->nm_readdirsize == 0) 308 nmp->nm_readdirsize = xmax; 309 } 310 /* XXX */ 311 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 312 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 313 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 314 nmp->nm_maxfilesize = maxfsize; 315 nmp->nm_mountp->mnt_fs_bshift = 316 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 317 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 318 } 319 nfsm_reqdone; 320 return (error); 321 } 322 #endif 323 324 /* 325 * Mount a remote root fs via. NFS. It goes like this: 326 * - Call nfs_boot_init() to fill in the nfs_diskless struct 327 * - build the rootfs mount point and call mountnfs() to do the rest. 328 */ 329 int 330 nfs_mountroot(void) 331 { 332 struct timespec ts; 333 struct nfs_diskless *nd; 334 struct vattr attr; 335 struct mount *mp; 336 struct vnode *vp; 337 struct lwp *l; 338 long n; 339 int error; 340 341 l = curlwp; /* XXX */ 342 343 if (device_class(root_device) != DV_IFNET) 344 return (ENODEV); 345 346 /* 347 * XXX time must be non-zero when we init the interface or else 348 * the arp code will wedge. [Fixed now in if_ether.c] 349 * However, the NFS attribute cache gives false "hits" when the 350 * current time < nfs_attrtimeo(nmp, np) so keep this in for now. 351 */ 352 if (time_second < NFS_MAXATTRTIMO) { 353 ts.tv_sec = NFS_MAXATTRTIMO; 354 ts.tv_nsec = 0; 355 tc_setclock(&ts); 356 } 357 358 /* 359 * Call nfs_boot_init() to fill in the nfs_diskless struct. 360 * Side effect: Finds and configures a network interface. 361 */ 362 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP); 363 error = nfs_boot_init(nd, l); 364 if (error) { 365 kmem_free(nd, sizeof(*nd)); 366 return (error); 367 } 368 369 /* 370 * Create the root mount point. 371 */ 372 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); 373 if (error) 374 goto out; 375 printf("root on %s\n", nd->nd_root.ndm_host); 376 377 /* 378 * Link it into the mount list. 379 */ 380 mountlist_append(mp); 381 rootvp = vp; 382 mp->mnt_vnodecovered = NULLVP; 383 vfs_unbusy(mp, false, NULL); 384 385 /* Get root attributes (for the time). */ 386 vn_lock(vp, LK_SHARED | LK_RETRY); 387 error = VOP_GETATTR(vp, &attr, l->l_cred); 388 VOP_UNLOCK(vp); 389 if (error) 390 panic("nfs_mountroot: getattr for root"); 391 n = attr.va_atime.tv_sec; 392 #ifdef DEBUG 393 printf("root time: 0x%lx\n", n); 394 #endif 395 setrootfstime(n); 396 397 out: 398 if (error) 399 nfs_boot_cleanup(nd, l); 400 kmem_free(nd, sizeof(*nd)); 401 return (error); 402 } 403 404 /* 405 * Internal version of mount system call for diskless setup. 406 * Separate function because we used to call it twice. 407 * (once for root and once for swap) 408 */ 409 static int 410 nfs_mount_diskless(struct nfs_dlmount *ndmntp, const char *mntname, struct mount **mpp, struct vnode **vpp, struct lwp *l) 411 /* mntname: mount point name */ 412 { 413 struct mount *mp; 414 struct mbuf *m; 415 int error; 416 417 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp); 418 419 mp->mnt_op = &nfs_vfsops; 420 421 /* 422 * Historical practice expects NFS root file systems to 423 * be initially mounted r/w. 424 */ 425 mp->mnt_flag &= ~MNT_RDONLY; 426 427 /* Get mbuf for server sockaddr. */ 428 m = m_get(M_WAIT, MT_SONAME); 429 if (m == NULL) 430 panic("nfs_mountroot: mget soname for %s", mntname); 431 MCLAIM(m, &nfs_mowner); 432 memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr, 433 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 434 435 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 436 ndmntp->ndm_args.hostname, vpp, l); 437 if (error) { 438 vfs_unbusy(mp, false, NULL); 439 vfs_destroy(mp); 440 printf("nfs_mountroot: mount %s failed: %d\n", 441 mntname, error); 442 } else 443 *mpp = mp; 444 445 return (error); 446 } 447 448 void 449 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, struct lwp *l) 450 { 451 int s; 452 int adjsock; 453 int maxio; 454 455 s = splsoftnet(); 456 457 /* 458 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 459 * no sense in that context. 460 */ 461 if (argp->sotype == SOCK_STREAM) 462 argp->flags &= ~NFSMNT_NOCONN; 463 464 /* 465 * Cookie translation is not needed for v2, silently ignore it. 466 */ 467 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 468 NFSMNT_XLATECOOKIE) 469 argp->flags &= ~NFSMNT_XLATECOOKIE; 470 471 /* Re-bind if rsrvd port requested and wasn't on one */ 472 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 473 && (argp->flags & NFSMNT_RESVPORT); 474 /* Also re-bind if we're switching to/from a connected UDP socket */ 475 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 476 (argp->flags & NFSMNT_NOCONN)); 477 478 /* Update flags. */ 479 nmp->nm_flag = argp->flags; 480 splx(s); 481 482 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 483 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 484 if (nmp->nm_timeo < NFS_MINTIMEO) 485 nmp->nm_timeo = NFS_MINTIMEO; 486 else if (nmp->nm_timeo > NFS_MAXTIMEO) 487 nmp->nm_timeo = NFS_MAXTIMEO; 488 } 489 490 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 491 nmp->nm_retry = argp->retrans; 492 if (nmp->nm_retry > NFS_MAXREXMIT) 493 nmp->nm_retry = NFS_MAXREXMIT; 494 } 495 496 #ifndef NFS_V2_ONLY 497 if (argp->flags & NFSMNT_NFSV3) { 498 if (argp->sotype == SOCK_DGRAM) 499 maxio = NFS_MAXDGRAMDATA; 500 else 501 maxio = NFS_MAXDATA; 502 } else 503 #endif 504 maxio = NFS_V2MAXDATA; 505 506 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 507 int osize = nmp->nm_wsize; 508 nmp->nm_wsize = argp->wsize; 509 /* Round down to multiple of blocksize */ 510 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 511 if (nmp->nm_wsize <= 0) 512 nmp->nm_wsize = NFS_FABLKSIZE; 513 adjsock |= (nmp->nm_wsize != osize); 514 } 515 if (nmp->nm_wsize > maxio) 516 nmp->nm_wsize = maxio; 517 if (nmp->nm_wsize > MAXBSIZE) 518 nmp->nm_wsize = MAXBSIZE; 519 520 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 521 int osize = nmp->nm_rsize; 522 nmp->nm_rsize = argp->rsize; 523 /* Round down to multiple of blocksize */ 524 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 525 if (nmp->nm_rsize <= 0) 526 nmp->nm_rsize = NFS_FABLKSIZE; 527 adjsock |= (nmp->nm_rsize != osize); 528 } 529 if (nmp->nm_rsize > maxio) 530 nmp->nm_rsize = maxio; 531 if (nmp->nm_rsize > MAXBSIZE) 532 nmp->nm_rsize = MAXBSIZE; 533 534 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 535 nmp->nm_readdirsize = argp->readdirsize; 536 /* Round down to multiple of minimum blocksize */ 537 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 538 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 539 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 540 /* Bigger than buffer size makes no sense */ 541 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 542 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 543 } else if (argp->flags & NFSMNT_RSIZE) 544 nmp->nm_readdirsize = nmp->nm_rsize; 545 546 if (nmp->nm_readdirsize > maxio) 547 nmp->nm_readdirsize = maxio; 548 549 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 550 argp->maxgrouplist <= NFS_MAXGRPS) 551 nmp->nm_numgrps = argp->maxgrouplist; 552 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 553 argp->readahead <= NFS_MAXRAHEAD) 554 nmp->nm_readahead = argp->readahead; 555 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 556 argp->deadthresh <= NFS_NEVERDEAD) 557 nmp->nm_deadthresh = argp->deadthresh; 558 559 adjsock |= ((nmp->nm_sotype != argp->sotype) || 560 (nmp->nm_soproto != argp->proto)); 561 nmp->nm_sotype = argp->sotype; 562 nmp->nm_soproto = argp->proto; 563 564 if (nmp->nm_so && adjsock) { 565 nfs_safedisconnect(nmp); 566 if (nmp->nm_sotype == SOCK_DGRAM) 567 while (nfs_connect(nmp, (struct nfsreq *)0, l)) { 568 printf("nfs_args: retrying connect\n"); 569 kpause("nfscn3", false, hz, NULL); 570 } 571 } 572 } 573 574 /* 575 * VFS Operations. 576 * 577 * mount system call 578 * It seems a bit dumb to copyinstr() the host and path here and then 579 * memcpy() them in mountnfs(), but I wanted to detect errors before 580 * doing the sockargs() call because sockargs() allocates an mbuf and 581 * an error after that means that I have to release the mbuf. 582 */ 583 /* ARGSUSED */ 584 int 585 nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 586 { 587 struct lwp *l = curlwp; 588 int error; 589 struct nfs_args *args = data; 590 struct mbuf *nam; 591 struct nfsmount *nmp = VFSTONFS(mp); 592 struct sockaddr *sa; 593 struct vnode *vp; 594 char *pth, *hst; 595 size_t len; 596 u_char *nfh; 597 598 if (args == NULL) 599 return EINVAL; 600 if (*data_len < sizeof *args) 601 return EINVAL; 602 603 if (mp->mnt_flag & MNT_GETARGS) { 604 605 if (nmp == NULL) 606 return (EIO); 607 if (args->addr != NULL) { 608 sa = mtod(nmp->nm_nam, struct sockaddr *); 609 error = copyout(sa, args->addr, sa->sa_len); 610 if (error) 611 return (error); 612 args->addrlen = sa->sa_len; 613 } else 614 args->addrlen = 0; 615 616 args->version = NFS_ARGSVERSION; 617 args->sotype = nmp->nm_sotype; 618 args->proto = nmp->nm_soproto; 619 args->fh = NULL; 620 args->fhsize = 0; 621 args->flags = nmp->nm_flag; 622 args->wsize = nmp->nm_wsize; 623 args->rsize = nmp->nm_rsize; 624 args->readdirsize = nmp->nm_readdirsize; 625 args->timeo = nmp->nm_timeo; 626 args->retrans = nmp->nm_retry; 627 args->maxgrouplist = nmp->nm_numgrps; 628 args->readahead = nmp->nm_readahead; 629 args->leaseterm = 0; /* dummy */ 630 args->deadthresh = nmp->nm_deadthresh; 631 args->hostname = NULL; 632 *data_len = sizeof *args; 633 return 0; 634 } 635 636 if (args->version != NFS_ARGSVERSION) 637 return (EPROGMISMATCH); 638 if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB)) 639 return (EPROGUNAVAIL); 640 #ifdef NFS_V2_ONLY 641 if (args->flags & NFSMNT_NFSV3) 642 return (EPROGMISMATCH); 643 #endif 644 if (mp->mnt_flag & MNT_UPDATE) { 645 if (nmp == NULL) 646 return (EIO); 647 /* 648 * When doing an update, we can't change from or to 649 * v3, or change cookie translation 650 */ 651 args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) | 652 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)); 653 nfs_decode_args(nmp, args, l); 654 return (0); 655 } 656 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 657 return (EINVAL); 658 nfh = malloc(NFSX_V3FHMAX, M_TEMP, M_WAITOK); 659 error = copyin(args->fh, nfh, args->fhsize); 660 if (error) 661 goto free_nfh; 662 pth = malloc(MNAMELEN, M_TEMP, M_WAITOK); 663 error = copyinstr(path, pth, MNAMELEN - 1, &len); 664 if (error) 665 goto free_pth; 666 memset(&pth[len], 0, MNAMELEN - len); 667 hst = malloc(MNAMELEN, M_TEMP, M_WAITOK); 668 error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len); 669 if (error) 670 goto free_hst; 671 memset(&hst[len], 0, MNAMELEN - len); 672 /* sockargs() call must be after above copyin() calls */ 673 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME); 674 if (error) 675 goto free_hst; 676 MCLAIM(nam, &nfs_mowner); 677 args->fh = nfh; 678 error = mountnfs(args, mp, nam, pth, hst, &vp, l); 679 680 free_hst: 681 free(hst, M_TEMP); 682 free_pth: 683 free(pth, M_TEMP); 684 free_nfh: 685 free(nfh, M_TEMP); 686 687 return (error); 688 } 689 690 /* 691 * Common code for mount and mountroot 692 */ 693 int 694 mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, const char *pth, const char *hst, struct vnode **vpp, struct lwp *l) 695 { 696 struct nfsmount *nmp; 697 struct nfsnode *np; 698 struct vnode *vp; 699 int error; 700 struct vattr *attrs; 701 kauth_cred_t cr; 702 char iosname[IOSTATNAMELEN]; 703 704 /* 705 * If the number of nfs iothreads to use has never 706 * been set, create a reasonable number of them. 707 */ 708 709 if (nfs_niothreads < 0) { 710 nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS); 711 } 712 713 if (mp->mnt_flag & MNT_UPDATE) { 714 nmp = VFSTONFS(mp); 715 /* update paths, file handles, etc, here XXX */ 716 m_freem(nam); 717 return (0); 718 } else { 719 nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP); 720 mp->mnt_data = nmp; 721 TAILQ_INIT(&nmp->nm_uidlruhead); 722 TAILQ_INIT(&nmp->nm_bufq); 723 rw_init(&nmp->nm_writeverflock); 724 mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE); 725 cv_init(&nmp->nm_rcvcv, "nfsrcv"); 726 cv_init(&nmp->nm_sndcv, "nfssnd"); 727 cv_init(&nmp->nm_aiocv, "nfsaio"); 728 cv_init(&nmp->nm_disconcv, "nfsdis"); 729 } 730 vfs_getnewfsid(mp); 731 nmp->nm_mountp = mp; 732 733 #ifndef NFS_V2_ONLY 734 if ((argp->flags & NFSMNT_NFSV3) == 0) 735 #endif 736 { 737 if (argp->fhsize != NFSX_V2FH) { 738 return EINVAL; 739 } 740 } 741 742 /* 743 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 744 * will overwrite this. 745 */ 746 nmp->nm_maxfilesize = 0xffffffffLL; 747 748 nmp->nm_timeo = NFS_TIMEO; 749 nmp->nm_retry = NFS_RETRANS; 750 nmp->nm_wsize = NFS_WSIZE; 751 nmp->nm_rsize = NFS_RSIZE; 752 nmp->nm_readdirsize = NFS_READDIRSIZE; 753 nmp->nm_numgrps = NFS_MAXGRPS; 754 nmp->nm_readahead = NFS_DEFRAHEAD; 755 nmp->nm_deadthresh = NFS_DEFDEADTHRESH; 756 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, 757 mp->mnt_op->vfs_name, mp, l); 758 if (error) 759 goto bad; 760 nmp->nm_nam = nam; 761 762 /* Set up the sockets and per-host congestion */ 763 nmp->nm_sotype = argp->sotype; 764 nmp->nm_soproto = argp->proto; 765 766 nfs_decode_args(nmp, argp, l); 767 768 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 769 mp->mnt_dev_bshift = DEV_BSHIFT; 770 771 /* 772 * For Connection based sockets (TCP,...) defer the connect until 773 * the first request, in case the server is not responding. 774 */ 775 if (nmp->nm_sotype == SOCK_DGRAM && 776 (error = nfs_connect(nmp, (struct nfsreq *)0, l))) 777 goto bad; 778 779 /* 780 * This is silly, but it has to be set so that vinifod() works. 781 * We do not want to do an nfs_statvfs() here since we can get 782 * stuck on a dead server and we are holding a lock on the mount 783 * point. 784 */ 785 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 786 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 787 if (error) 788 goto bad; 789 vp = NFSTOV(np); 790 attrs = malloc(sizeof(struct vattr), M_TEMP, M_WAITOK); 791 VOP_GETATTR(vp, attrs, l->l_cred); 792 if ((nmp->nm_flag & NFSMNT_NFSV3) && (vp->v_type == VDIR)) { 793 cr = kauth_cred_alloc(); 794 kauth_cred_setuid(cr, attrs->va_uid); 795 kauth_cred_seteuid(cr, attrs->va_uid); 796 kauth_cred_setsvuid(cr, attrs->va_uid); 797 kauth_cred_setgid(cr, attrs->va_gid); 798 kauth_cred_setegid(cr, attrs->va_gid); 799 kauth_cred_setsvgid(cr, attrs->va_gid); 800 nfs_cookieheuristic(vp, &nmp->nm_iflag, l, cr); 801 kauth_cred_free(cr); 802 } 803 free(attrs, M_TEMP); 804 805 /* 806 * A reference count is needed on the nfsnode representing the 807 * remote root. If this object is not persistent, then backward 808 * traversals of the mount point (i.e. "..") will not work if 809 * the nfsnode gets flushed out of the cache. Ufs does not have 810 * this problem, because one can identify root inodes by their 811 * number == UFS_ROOTINO (2). So, just unlock, but no rele. 812 */ 813 814 nmp->nm_vnode = vp; 815 if (vp->v_type == VNON) 816 vp->v_type = VDIR; 817 vp->v_vflag |= VV_ROOT; 818 VOP_UNLOCK(vp); 819 *vpp = vp; 820 821 snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++); 822 nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname); 823 824 return (0); 825 bad: 826 nfs_disconnect(nmp); 827 rw_destroy(&nmp->nm_writeverflock); 828 mutex_destroy(&nmp->nm_lock); 829 cv_destroy(&nmp->nm_rcvcv); 830 cv_destroy(&nmp->nm_sndcv); 831 cv_destroy(&nmp->nm_aiocv); 832 cv_destroy(&nmp->nm_disconcv); 833 kmem_free(nmp, sizeof(*nmp)); 834 m_freem(nam); 835 return (error); 836 } 837 838 /* 839 * unmount system call 840 */ 841 int 842 nfs_unmount(struct mount *mp, int mntflags) 843 { 844 struct nfsmount *nmp; 845 struct vnode *vp; 846 int error, flags = 0; 847 848 if (mntflags & MNT_FORCE) 849 flags |= FORCECLOSE; 850 nmp = VFSTONFS(mp); 851 /* 852 * Goes something like this.. 853 * - Check for activity on the root vnode (other than ourselves). 854 * - Call vflush() to clear out vnodes for this file system, 855 * except for the root vnode. 856 * - Decrement reference on the vnode representing remote root. 857 * - Close the socket 858 * - Free up the data structures 859 */ 860 /* 861 * We need to decrement the ref. count on the nfsnode representing 862 * the remote root. See comment in mountnfs(). 863 */ 864 vp = nmp->nm_vnode; 865 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 866 if (error != 0) 867 return error; 868 869 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 1) { 870 VOP_UNLOCK(vp); 871 return (EBUSY); 872 } 873 874 error = vflush(mp, vp, flags); 875 if (error) { 876 VOP_UNLOCK(vp); 877 return (error); 878 } 879 880 /* 881 * We are now committed to the unmount; mark the mount structure 882 * as doomed so that any sleepers kicked awake by nfs_disconnect 883 * will go away cleanly. 884 */ 885 nmp->nm_iflag |= NFSMNT_DISMNT; 886 887 /* 888 * Clean up the stats... note that we carefully avoid decrementing 889 * nfs_mount_count here for good reason - we may not be unmounting 890 * the last thing mounted. 891 */ 892 iostat_free(nmp->nm_stats); 893 894 /* 895 * There is one reference count to get rid of here 896 * (see comment in mountnfs()). 897 */ 898 VOP_UNLOCK(vp); 899 vgone(vp); 900 nfs_disconnect(nmp); 901 m_freem(nmp->nm_nam); 902 903 rw_destroy(&nmp->nm_writeverflock); 904 mutex_destroy(&nmp->nm_lock); 905 cv_destroy(&nmp->nm_rcvcv); 906 cv_destroy(&nmp->nm_sndcv); 907 cv_destroy(&nmp->nm_aiocv); 908 cv_destroy(&nmp->nm_disconcv); 909 kmem_free(nmp, sizeof(*nmp)); 910 return (0); 911 } 912 913 /* 914 * Return root of a filesystem 915 */ 916 int 917 nfs_root(struct mount *mp, struct vnode **vpp) 918 { 919 struct vnode *vp; 920 struct nfsmount *nmp; 921 int error; 922 923 nmp = VFSTONFS(mp); 924 vp = nmp->nm_vnode; 925 vref(vp); 926 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 927 if (error != 0) { 928 vrele(vp); 929 return error; 930 } 931 *vpp = vp; 932 return (0); 933 } 934 935 extern int syncprt; 936 937 static bool 938 nfs_sync_selector(void *cl, struct vnode *vp) 939 { 940 941 return !LIST_EMPTY(&vp->v_dirtyblkhd) || !UVM_OBJ_IS_CLEAN(&vp->v_uobj); 942 } 943 944 /* 945 * Flush out the buffer cache 946 */ 947 /* ARGSUSED */ 948 int 949 nfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 950 { 951 struct vnode *vp; 952 struct vnode_iterator *marker; 953 int error, allerror = 0; 954 955 /* 956 * Force stale buffer cache information to be flushed. 957 */ 958 vfs_vnode_iterator_init(mp, &marker); 959 while ((vp = vfs_vnode_iterator_next(marker, nfs_sync_selector, 960 NULL))) 961 { 962 error = vn_lock(vp, LK_EXCLUSIVE); 963 if (error) { 964 vrele(vp); 965 continue; 966 } 967 error = VOP_FSYNC(vp, cred, 968 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); 969 if (error) 970 allerror = error; 971 vput(vp); 972 } 973 vfs_vnode_iterator_destroy(marker); 974 return allerror; 975 } 976 977 /* 978 * NFS flat namespace lookup. 979 * Currently unsupported. 980 */ 981 /* ARGSUSED */ 982 int 983 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 984 { 985 986 return (EOPNOTSUPP); 987 } 988 989 /* 990 * Do that sysctl thang... 991 */ 992 static int 993 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 994 { 995 struct sysctlnode node; 996 int val; 997 int error; 998 999 val = nfs_niothreads; 1000 node = *rnode; 1001 node.sysctl_data = &val; 1002 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1003 if (error || newp == NULL) 1004 return error; 1005 1006 return nfs_set_niothreads(val); 1007 } 1008 1009 static void 1010 nfs_sysctl_init(void) 1011 { 1012 1013 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1014 CTLFLAG_PERMANENT, 1015 CTLTYPE_NODE, "nfs", 1016 SYSCTL_DESCR("NFS vfs options"), 1017 NULL, 0, NULL, 0, 1018 CTL_VFS, 2, CTL_EOL); 1019 /* 1020 * XXX the "2" above could be dynamic, thereby eliminating one 1021 * more instance of the "number to vfs" mapping problem, but 1022 * "2" is the order as taken from sys/mount.h 1023 */ 1024 1025 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1026 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1027 CTLTYPE_STRUCT, "nfsstats", 1028 SYSCTL_DESCR("NFS operation statistics"), 1029 NULL, 0, &nfsstats, sizeof(nfsstats), 1030 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1031 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1032 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1033 CTLTYPE_INT, "iothreads", 1034 SYSCTL_DESCR("Number of NFS client processes desired"), 1035 sysctl_vfs_nfs_iothreads, 0, NULL, 0, 1036 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1037 } 1038 1039 static void 1040 nfs_sysctl_fini(void) 1041 { 1042 1043 sysctl_teardown(&nfs_clog); 1044 } 1045 1046 /* ARGSUSED */ 1047 int 1048 nfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 1049 { 1050 size_t fidsize; 1051 size_t fhsize; 1052 struct nfsnode *np; 1053 int error; 1054 struct vattr va; 1055 1056 fidsize = fid->fid_len; 1057 if (fidsize < sizeof(*fid)) { 1058 return EINVAL; 1059 } 1060 fhsize = fidsize - sizeof(*fid); 1061 if ((fhsize % NFSX_UNSIGNED) != 0) { 1062 return EINVAL; 1063 } 1064 if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) { 1065 if (fhsize > NFSX_V3FHMAX || fhsize == 0) { 1066 return EINVAL; 1067 } 1068 } else { 1069 if (fhsize != NFSX_V2FH) { 1070 return EINVAL; 1071 } 1072 } 1073 error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np); 1074 if (error) { 1075 return error; 1076 } 1077 *vpp = NFSTOV(np); 1078 error = VOP_GETATTR(*vpp, &va, kauth_cred_get()); 1079 if (error != 0) { 1080 vput(*vpp); 1081 *vpp = NULLVP; 1082 } 1083 return error; 1084 } 1085 1086 /* ARGSUSED */ 1087 int 1088 nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize) 1089 { 1090 struct nfsnode *np; 1091 struct fid *fid; 1092 size_t fidsize; 1093 int error = 0; 1094 1095 np = VTONFS(vp); 1096 fidsize = sizeof(*fid) + np->n_fhsize; 1097 if (*bufsize < fidsize) { 1098 error = E2BIG; 1099 } 1100 *bufsize = fidsize; 1101 if (error == 0) { 1102 struct fid fid_store; 1103 1104 fid = &fid_store; 1105 memset(fid, 0, sizeof(*fid)); 1106 fid->fid_len = fidsize; 1107 memcpy(buf, fid, sizeof(*fid)); 1108 memcpy(buf->fid_data, np->n_fhp, np->n_fhsize); 1109 } 1110 return error; 1111 } 1112 1113 /* 1114 * Vfs start routine, a no-op. 1115 */ 1116 /* ARGSUSED */ 1117 int 1118 nfs_start(struct mount *mp, int flags) 1119 { 1120 1121 return (0); 1122 } 1123 1124 /* 1125 * Called once at VFS init to initialize client-specific data structures. 1126 */ 1127 void 1128 nfs_vfs_init(void) 1129 { 1130 1131 /* Initialize NFS server / client shared data. */ 1132 nfs_init(); 1133 nfs_node_init(); 1134 1135 /* Initialize the kqueue structures */ 1136 nfs_kqinit(); 1137 /* Initialize the iod structures */ 1138 nfs_iodinit(); 1139 1140 nfs_commitsize = uvmexp.npages << (PAGE_SHIFT - 4); 1141 } 1142 1143 void 1144 nfs_vfs_done(void) 1145 { 1146 1147 nfs_node_done(); 1148 nfs_kqfini(); 1149 nfs_iodfini(); 1150 } 1151
Indexes created Wed Oct 01 07:09:59 GMT 2025