1 /* $OpenBSD: nfs_vfsops.c,v 1.100 2014/07/12 18:43:52 tedu Exp $ */ 2 /* $NetBSD: nfs_vfsops.c,v 1.46.4.1 1996/05/25 22:40:35 fvdl Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993, 1995 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Rick Macklem at The University of Guelph. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 36 */ 37 38 #include <sys/param.h> 39 #include <sys/conf.h> 40 #include <sys/ioctl.h> 41 #include <sys/signal.h> 42 #include <sys/proc.h> 43 #include <sys/namei.h> 44 #include <sys/vnode.h> 45 #include <sys/kernel.h> 46 #include <sys/mount.h> 47 #include <sys/swap.h> 48 #include <sys/buf.h> 49 #include <sys/mbuf.h> 50 #include <sys/dirent.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/systm.h> 54 #include <sys/sysctl.h> 55 #include <sys/queue.h> 56 57 #include <net/if.h> 58 #include <net/route.h> 59 #include <netinet/in.h> 60 61 #include <nfs/rpcv2.h> 62 #include <nfs/nfsproto.h> 63 #include <nfs/nfsnode.h> 64 #include <nfs/nfs.h> 65 #include <nfs/nfsmount.h> 66 #include <nfs/xdr_subs.h> 67 #include <nfs/nfsm_subs.h> 68 #include <nfs/nfsdiskless.h> 69 #include <nfs/nfs_var.h> 70 71 extern struct nfsstats nfsstats; 72 extern int nfs_ticks; 73 extern u_int32_t nfs_procids[NFS_NPROCS]; 74 75 int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t, struct proc *); 76 int nfs_checkexp(struct mount *, struct mbuf *, int *, struct ucred **); 77 struct mount *nfs_mount_diskless(struct nfs_dlmount *, char *, int); 78 79 /* 80 * nfs vfs operations. 81 */ 82 const struct vfsops nfs_vfsops = { 83 nfs_mount, 84 nfs_start, 85 nfs_unmount, 86 nfs_root, 87 nfs_quotactl, 88 nfs_statfs, 89 nfs_sync, 90 nfs_vget, 91 nfs_fhtovp, 92 nfs_vptofh, 93 nfs_vfs_init, 94 nfs_sysctl, 95 nfs_checkexp 96 }; 97 98 /* 99 * nfs statfs call 100 */ 101 int 102 nfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p) 103 { 104 struct vnode *vp; 105 struct nfs_statfs *sfp = NULL; 106 struct nfsm_info info; 107 u_int32_t *tl; 108 int32_t t1; 109 caddr_t cp2; 110 struct nfsmount *nmp = VFSTONFS(mp); 111 int error = 0, retattr; 112 struct ucred *cred; 113 struct nfsnode *np; 114 u_quad_t tquad; 115 116 info.nmi_v3 = (nmp->nm_flag & NFSMNT_NFSV3); 117 118 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 119 if (error) 120 return (error); 121 vp = NFSTOV(np); 122 cred = crget(); 123 cred->cr_ngroups = 0; 124 if (info.nmi_v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0) 125 (void)nfs_fsinfo(nmp, vp, cred, p); 126 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 127 info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3)); 128 nfsm_fhtom(&info, vp, info.nmi_v3); 129 130 info.nmi_procp = p; 131 info.nmi_cred = cred; 132 error = nfs_request(vp, NFSPROC_FSSTAT, &info); 133 if (info.nmi_v3) 134 nfsm_postop_attr(vp, retattr); 135 if (error) { 136 m_freem(info.nmi_mrep); 137 goto nfsmout; 138 } 139 140 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(info.nmi_v3)); 141 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 142 if (info.nmi_v3) { 143 sbp->f_bsize = NFS_FABLKSIZE; 144 tquad = fxdr_hyper(&sfp->sf_tbytes); 145 sbp->f_blocks = tquad / (u_quad_t)NFS_FABLKSIZE; 146 tquad = fxdr_hyper(&sfp->sf_fbytes); 147 sbp->f_bfree = tquad / (u_quad_t)NFS_FABLKSIZE; 148 tquad = fxdr_hyper(&sfp->sf_abytes); 149 sbp->f_bavail = (quad_t)tquad / (quad_t)NFS_FABLKSIZE; 150 151 tquad = fxdr_hyper(&sfp->sf_tfiles); 152 sbp->f_files = tquad; 153 tquad = fxdr_hyper(&sfp->sf_ffiles); 154 sbp->f_ffree = tquad; 155 sbp->f_favail = tquad; 156 sbp->f_namemax = MAXNAMLEN; 157 } else { 158 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 159 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 160 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 161 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 162 sbp->f_files = 0; 163 sbp->f_ffree = 0; 164 } 165 copy_statfs_info(sbp, mp); 166 m_freem(info.nmi_mrep); 167 nfsmout: 168 vrele(vp); 169 crfree(cred); 170 return (error); 171 } 172 173 /* 174 * nfs version 3 fsinfo rpc call 175 */ 176 int 177 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct ucred *cred, 178 struct proc *p) 179 { 180 struct nfsv3_fsinfo *fsp; 181 struct nfsm_info info; 182 int32_t t1; 183 u_int32_t *tl, pref, max; 184 caddr_t cp2; 185 int error = 0, retattr; 186 187 nfsstats.rpccnt[NFSPROC_FSINFO]++; 188 info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(1)); 189 nfsm_fhtom(&info, vp, 1); 190 191 info.nmi_procp = p; 192 info.nmi_cred = cred; 193 error = nfs_request(vp, NFSPROC_FSINFO, &info); 194 195 nfsm_postop_attr(vp, retattr); 196 if (error) { 197 m_freem(info.nmi_mrep); 198 goto nfsmout; 199 } 200 201 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 202 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 203 if (pref < nmp->nm_wsize) 204 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 205 ~(NFS_FABLKSIZE - 1); 206 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 207 if (max < nmp->nm_wsize) { 208 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 209 if (nmp->nm_wsize == 0) 210 nmp->nm_wsize = max; 211 } 212 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 213 if (pref < nmp->nm_rsize) 214 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 215 ~(NFS_FABLKSIZE - 1); 216 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 217 if (max < nmp->nm_rsize) { 218 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 219 if (nmp->nm_rsize == 0) 220 nmp->nm_rsize = max; 221 } 222 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 223 if (pref < nmp->nm_readdirsize) 224 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 225 ~(NFS_DIRBLKSIZ - 1); 226 if (max < nmp->nm_readdirsize) { 227 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 228 if (nmp->nm_readdirsize == 0) 229 nmp->nm_readdirsize = max; 230 } 231 nmp->nm_flag |= NFSMNT_GOTFSINFO; 232 233 m_freem(info.nmi_mrep); 234 nfsmout: 235 return (error); 236 } 237 238 struct nfs_diskless nfs_diskless; 239 240 /* 241 * Mount a remote root fs via. NFS. It goes like this: 242 * - Call nfs_boot_init() to fill in the nfs_diskless struct 243 * (using RARP, bootparam RPC, mountd RPC) 244 * - hand craft the swap nfs vnode hanging off a fake mount point 245 * if swdevt[0].sw_dev == NODEV 246 * - build the rootfs mount point and call mountnfs() to do the rest. 247 */ 248 int 249 nfs_mountroot(void) 250 { 251 struct vattr attr; 252 struct mount *mp; 253 struct vnode *vp; 254 struct proc *procp; 255 long n; 256 int error; 257 258 procp = curproc; /* XXX */ 259 260 /* 261 * Call nfs_boot_init() to fill in the nfs_diskless struct. 262 * Side effect: Finds and configures a network interface. 263 */ 264 nfs_boot_init(&nfs_diskless, procp); 265 266 /* 267 * Create the root mount point. 268 */ 269 if (nfs_boot_getfh(&nfs_diskless.nd_boot, "root", &nfs_diskless.nd_root, -1)) 270 panic("nfs_mountroot: root"); 271 mp = nfs_mount_diskless(&nfs_diskless.nd_root, "/", 0); 272 nfs_root(mp, &rootvp); 273 printf("root on %s\n", nfs_diskless.nd_root.ndm_host); 274 275 /* 276 * Link it into the mount list. 277 */ 278 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 279 vfs_unbusy(mp); 280 281 /* Get root attributes (for the time). */ 282 error = VOP_GETATTR(rootvp, &attr, procp->p_ucred, procp); 283 if (error) panic("nfs_mountroot: getattr for root"); 284 n = attr.va_atime.tv_sec; 285 #ifdef DEBUG 286 printf("root time: 0x%lx\n", n); 287 #endif 288 inittodr(n); 289 290 #ifdef notyet 291 /* Set up swap credentials. */ 292 proc0.p_ucred->cr_uid = ntohl(nfs_diskless.swap_ucred.cr_uid); 293 proc0.p_ucred->cr_gid = ntohl(nfs_diskless.swap_ucred.cr_gid); 294 if ((proc0.p_ucred->cr_ngroups = ntohs(nfs_diskless.swap_ucred.cr_ngroups)) > 295 NGROUPS) 296 proc0.p_ucred->cr_ngroups = NGROUPS; 297 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 298 proc0.p_ucred->cr_groups[i] = ntohl(nfs_diskless.swap_ucred.cr_groups[i]); 299 #endif 300 301 /* 302 * "Mount" the swap device. 303 * 304 * On a "dataless" configuration (swap on disk) we will have: 305 * (swdevt[0].sw_dev != NODEV) identifying the swap device. 306 */ 307 if (swdevt[0].sw_dev != NODEV) { 308 if (bdevvp(swapdev, &swapdev_vp)) 309 panic("nfs_mountroot: can't setup swap vp"); 310 printf("swap on device 0x%x\n", swdevt[0].sw_dev); 311 return (0); 312 } 313 314 /* 315 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV) 316 * Create a fake mount point just for the swap vnode so that the 317 * swap file can be on a different server from the rootfs. 318 * 319 * Wait 5 retries, finally no swap is cool. -mickey 320 */ 321 error = nfs_boot_getfh(&nfs_diskless.nd_boot, "swap", &nfs_diskless.nd_swap, 5); 322 if (!error) { 323 mp = nfs_mount_diskless(&nfs_diskless.nd_swap, "/swap", 0); 324 nfs_root(mp, &vp); 325 vfs_unbusy(mp); 326 327 /* 328 * Since the swap file is not the root dir of a file system, 329 * hack it to a regular file. 330 */ 331 vp->v_type = VREG; 332 vp->v_flag = 0; 333 334 /* 335 * Next line is a hack to make swapmount() work on NFS 336 * swap files. 337 */ 338 swdevt[0].sw_dev = NETDEV; 339 /* end hack */ 340 nfs_diskless.sw_vp = vp; 341 342 /* 343 * Find out how large the swap file is. 344 */ 345 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 346 if (error) 347 printf("nfs_mountroot: getattr for swap\n"); 348 n = (long) (attr.va_size >> DEV_BSHIFT); 349 350 printf("swap on %s\n", nfs_diskless.nd_swap.ndm_host); 351 #ifdef DEBUG 352 printf("swap size: 0x%lx (blocks)\n", n); 353 #endif 354 return (0); 355 } 356 357 printf("WARNING: no swap\n"); 358 swdevt[0].sw_dev = NODEV; 359 return (0); 360 } 361 362 /* 363 * Internal version of mount system call for diskless setup. 364 */ 365 struct mount * 366 nfs_mount_diskless(struct nfs_dlmount *ndmntp, char *mntname, int mntflag) 367 { 368 struct mount *mp; 369 struct mbuf *m; 370 int error; 371 372 if (vfs_rootmountalloc("nfs", mntname, &mp)) 373 panic("nfs_mount_diskless: vfs_rootmountalloc failed"); 374 mp->mnt_flag |= mntflag; 375 376 /* Get mbuf for server sockaddr. */ 377 m = m_get(M_WAIT, MT_SONAME); 378 bcopy((caddr_t)ndmntp->ndm_args.addr, mtod(m, caddr_t), 379 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 380 381 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 382 ndmntp->ndm_args.hostname); 383 if (error) 384 panic("nfs_mountroot: mount %s failed: %d", mntname, error); 385 386 return (mp); 387 } 388 389 void 390 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, 391 struct nfs_args *nargp) 392 { 393 int s; 394 int adjsock = 0; 395 int maxio; 396 397 s = splsoftnet(); 398 399 #if 0 400 /* Re-bind if rsrvd port requested and wasn't on one */ 401 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 402 && (argp->flags & NFSMNT_RESVPORT); 403 #endif 404 /* Also re-bind if we're switching to/from a connected UDP socket */ 405 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 406 (argp->flags & NFSMNT_NOCONN)); 407 408 /* Update flags atomically. Don't change the lock bits. */ 409 nmp->nm_flag = 410 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 411 splx(s); 412 413 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 414 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 415 if (nmp->nm_timeo < NFS_MINTIMEO) 416 nmp->nm_timeo = NFS_MINTIMEO; 417 else if (nmp->nm_timeo > NFS_MAXTIMEO) 418 nmp->nm_timeo = NFS_MAXTIMEO; 419 } 420 421 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) 422 nmp->nm_retry = MIN(argp->retrans, NFS_MAXREXMIT); 423 if (!(nmp->nm_flag & NFSMNT_SOFT)) 424 nmp->nm_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 425 426 if (argp->flags & NFSMNT_NFSV3) { 427 if (argp->sotype == SOCK_DGRAM) 428 maxio = NFS_MAXDGRAMDATA; 429 else 430 maxio = NFS_MAXDATA; 431 } else 432 maxio = NFS_V2MAXDATA; 433 434 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 435 int osize = nmp->nm_wsize; 436 nmp->nm_wsize = argp->wsize; 437 /* Round down to multiple of blocksize */ 438 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 439 if (nmp->nm_wsize <= 0) 440 nmp->nm_wsize = NFS_FABLKSIZE; 441 adjsock |= (nmp->nm_wsize != osize); 442 } 443 if (nmp->nm_wsize > maxio) 444 nmp->nm_wsize = maxio; 445 if (nmp->nm_wsize > MAXBSIZE) 446 nmp->nm_wsize = MAXBSIZE; 447 448 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 449 int osize = nmp->nm_rsize; 450 nmp->nm_rsize = argp->rsize; 451 /* Round down to multiple of blocksize */ 452 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 453 if (nmp->nm_rsize <= 0) 454 nmp->nm_rsize = NFS_FABLKSIZE; 455 adjsock |= (nmp->nm_rsize != osize); 456 } 457 if (nmp->nm_rsize > maxio) 458 nmp->nm_rsize = maxio; 459 if (nmp->nm_rsize > MAXBSIZE) 460 nmp->nm_rsize = MAXBSIZE; 461 462 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 463 nmp->nm_readdirsize = argp->readdirsize; 464 /* Round down to multiple of blocksize */ 465 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 466 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 467 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 468 } else if (argp->flags & NFSMNT_RSIZE) 469 nmp->nm_readdirsize = nmp->nm_rsize; 470 471 if (nmp->nm_readdirsize > maxio) 472 nmp->nm_readdirsize = maxio; 473 474 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 475 argp->maxgrouplist <= NFS_MAXGRPS) 476 nmp->nm_numgrps = argp->maxgrouplist; 477 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 478 argp->readahead <= NFS_MAXRAHEAD) 479 nmp->nm_readahead = argp->readahead; 480 if (argp->flags & NFSMNT_ACREGMIN && argp->acregmin >= 0) { 481 if (argp->acregmin > 0xffff) 482 nmp->nm_acregmin = 0xffff; 483 else 484 nmp->nm_acregmin = argp->acregmin; 485 } 486 if (argp->flags & NFSMNT_ACREGMAX && argp->acregmax >= 0) { 487 if (argp->acregmax > 0xffff) 488 nmp->nm_acregmax = 0xffff; 489 else 490 nmp->nm_acregmax = argp->acregmax; 491 } 492 if (nmp->nm_acregmin > nmp->nm_acregmax) 493 nmp->nm_acregmin = nmp->nm_acregmax; 494 495 if (argp->flags & NFSMNT_ACDIRMIN && argp->acdirmin >= 0) { 496 if (argp->acdirmin > 0xffff) 497 nmp->nm_acdirmin = 0xffff; 498 else 499 nmp->nm_acdirmin = argp->acdirmin; 500 } 501 if (argp->flags & NFSMNT_ACDIRMAX && argp->acdirmax >= 0) { 502 if (argp->acdirmax > 0xffff) 503 nmp->nm_acdirmax = 0xffff; 504 else 505 nmp->nm_acdirmax = argp->acdirmax; 506 } 507 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 508 nmp->nm_acdirmin = nmp->nm_acdirmax; 509 510 if (nmp->nm_so && adjsock) { 511 nfs_disconnect(nmp); 512 if (nmp->nm_sotype == SOCK_DGRAM) 513 while (nfs_connect(nmp, NULL)) { 514 printf("nfs_args: retrying connect\n"); 515 (void) tsleep((caddr_t)&lbolt, 516 PSOCK, "nfscon", 0); 517 } 518 } 519 520 /* Update nargp based on nmp */ 521 nargp->wsize = nmp->nm_wsize; 522 nargp->rsize = nmp->nm_rsize; 523 nargp->readdirsize = nmp->nm_readdirsize; 524 nargp->timeo = nmp->nm_timeo; 525 nargp->retrans = nmp->nm_retry; 526 nargp->maxgrouplist = nmp->nm_numgrps; 527 nargp->readahead = nmp->nm_readahead; 528 nargp->acregmin = nmp->nm_acregmin; 529 nargp->acregmax = nmp->nm_acregmax; 530 nargp->acdirmin = nmp->nm_acdirmin; 531 nargp->acdirmax = nmp->nm_acdirmax; 532 } 533 534 /* 535 * VFS Operations. 536 * 537 * mount system call 538 * It seems a bit dumb to copyinstr() the host here and then 539 * bcopy() it in mountnfs(), but I wanted to detect errors before 540 * doing the sockargs() call because sockargs() allocates an mbuf and 541 * an error after that means that I have to release the mbuf. 542 */ 543 /* ARGSUSED */ 544 int 545 nfs_mount(struct mount *mp, const char *path, void *data, 546 struct nameidata *ndp, struct proc *p) 547 { 548 int error; 549 struct nfs_args args; 550 struct mbuf *nam; 551 char hst[MNAMELEN]; 552 size_t len; 553 u_char nfh[NFSX_V3FHMAX]; 554 555 error = copyin(data, &args, sizeof(args.version)); 556 if (error) 557 return (error); 558 if (args.version == 3) { 559 error = copyin (data, (caddr_t)&args, 560 sizeof (struct nfs_args3)); 561 args.flags &= ~(NFSMNT_INTERNAL|NFSMNT_NOAC); 562 } else if (args.version == NFS_ARGSVERSION) { 563 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 564 args.flags &= ~NFSMNT_NOAC; /* XXX - compatibility */ 565 } else 566 return (EPROGMISMATCH); 567 if (error) 568 return (error); 569 570 if ((args.flags & (NFSMNT_NFSV3|NFSMNT_RDIRPLUS)) == NFSMNT_RDIRPLUS) 571 return (EINVAL); 572 573 if (nfs_niothreads < 0) { 574 nfs_niothreads = 4; 575 nfs_getset_niothreads(1); 576 } 577 578 if (mp->mnt_flag & MNT_UPDATE) { 579 struct nfsmount *nmp = VFSTONFS(mp); 580 581 if (nmp == NULL) 582 return (EIO); 583 /* 584 * When doing an update, we can't change from or to 585 * v3. 586 */ 587 args.flags = (args.flags & ~(NFSMNT_NFSV3)) | 588 (nmp->nm_flag & (NFSMNT_NFSV3)); 589 nfs_decode_args(nmp, &args, &mp->mnt_stat.mount_info.nfs_args); 590 return (0); 591 } 592 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 593 return (EINVAL); 594 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 595 if (error) 596 return (error); 597 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 598 if (error) 599 return (error); 600 bzero(&hst[len], MNAMELEN - len); 601 /* sockargs() call must be after above copyin() calls */ 602 error = sockargs(&nam, args.addr, args.addrlen, MT_SONAME); 603 if (error) 604 return (error); 605 args.fh = nfh; 606 error = mountnfs(&args, mp, nam, path, hst); 607 return (error); 608 } 609 610 /* 611 * Common code for mount and mountroot 612 */ 613 int 614 mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, 615 const char *pth, char *hst) 616 { 617 struct nfsmount *nmp; 618 int error; 619 620 if (mp->mnt_flag & MNT_UPDATE) { 621 nmp = VFSTONFS(mp); 622 /* update paths, file handles, etc, here XXX */ 623 m_freem(nam); 624 return (0); 625 } else { 626 nmp = malloc(sizeof(struct nfsmount), M_NFSMNT, 627 M_WAITOK|M_ZERO); 628 mp->mnt_data = (qaddr_t)nmp; 629 } 630 631 vfs_getnewfsid(mp); 632 nmp->nm_mountp = mp; 633 nmp->nm_timeo = NFS_TIMEO; 634 nmp->nm_retry = NFS_RETRANS; 635 nmp->nm_wsize = NFS_WSIZE; 636 nmp->nm_rsize = NFS_RSIZE; 637 nmp->nm_readdirsize = NFS_READDIRSIZE; 638 nmp->nm_numgrps = NFS_MAXGRPS; 639 nmp->nm_readahead = NFS_DEFRAHEAD; 640 nmp->nm_fhsize = argp->fhsize; 641 nmp->nm_acregmin = NFS_MINATTRTIMO; 642 nmp->nm_acregmax = NFS_MAXATTRTIMO; 643 nmp->nm_acdirmin = NFS_MINATTRTIMO; 644 nmp->nm_acdirmax = NFS_MAXATTRTIMO; 645 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 646 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_vfc->vfc_name, MFSNAMELEN); 647 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 648 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 649 bcopy(hst, mp->mnt_stat.f_mntfromspec, MNAMELEN); 650 bcopy(argp, &mp->mnt_stat.mount_info.nfs_args, sizeof(*argp)); 651 nmp->nm_nam = nam; 652 nfs_decode_args(nmp, argp, &mp->mnt_stat.mount_info.nfs_args); 653 654 RB_INIT(&nmp->nm_ntree); 655 TAILQ_INIT(&nmp->nm_reqsq); 656 timeout_set(&nmp->nm_rtimeout, nfs_timer, nmp); 657 658 /* Set up the sockets and per-host congestion */ 659 nmp->nm_sotype = argp->sotype; 660 nmp->nm_soproto = argp->proto; 661 662 /* 663 * For Connection based sockets (TCP,...) defer the connect until 664 * the first request, in case the server is not responding. 665 */ 666 if (nmp->nm_sotype == SOCK_DGRAM && 667 (error = nfs_connect(nmp, NULL))) 668 goto bad; 669 670 /* 671 * This is silly, but it has to be set so that vinifod() works. 672 * We do not want to do an nfs_statfs() here since we can get 673 * stuck on a dead server and we are holding a lock on the mount 674 * point. 675 */ 676 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 677 678 return (0); 679 bad: 680 nfs_disconnect(nmp); 681 free((caddr_t)nmp, M_NFSMNT, 0); 682 m_freem(nam); 683 return (error); 684 } 685 686 /* unmount system call */ 687 int 688 nfs_unmount(struct mount *mp, int mntflags, struct proc *p) 689 { 690 struct nfsmount *nmp; 691 int error, flags; 692 693 nmp = VFSTONFS(mp); 694 flags = 0; 695 696 if (mntflags & MNT_FORCE) 697 flags |= FORCECLOSE; 698 699 error = vflush(mp, NULL, flags); 700 if (error) 701 return (error); 702 703 nfs_disconnect(nmp); 704 m_freem(nmp->nm_nam); 705 timeout_del(&nmp->nm_rtimeout); 706 free(nmp, M_NFSMNT, 0); 707 return (0); 708 } 709 710 /* 711 * Return root of a filesystem 712 */ 713 int 714 nfs_root(struct mount *mp, struct vnode **vpp) 715 { 716 struct nfsmount *nmp; 717 struct nfsnode *np; 718 int error; 719 720 nmp = VFSTONFS(mp); 721 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 722 if (error) 723 return (error); 724 *vpp = NFSTOV(np); 725 return (0); 726 } 727 728 /* 729 * Flush out the buffer cache 730 */ 731 int 732 nfs_sync(struct mount *mp, int waitfor, struct ucred *cred, struct proc *p) 733 { 734 struct vnode *vp; 735 int error, allerror = 0; 736 737 /* 738 * Don't traverse the vnode list if we want to skip all of them. 739 */ 740 if (waitfor == MNT_LAZY) 741 return (allerror); 742 743 /* 744 * Force stale buffer cache information to be flushed. 745 */ 746 loop: 747 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 748 /* 749 * If the vnode that we are about to sync is no longer 750 * associated with this mount point, start over. 751 */ 752 if (vp->v_mount != mp) 753 goto loop; 754 if (VOP_ISLOCKED(vp) || LIST_FIRST(&vp->v_dirtyblkhd) == NULL) 755 continue; 756 if (vget(vp, LK_EXCLUSIVE, p)) 757 goto loop; 758 error = VOP_FSYNC(vp, cred, waitfor, p); 759 if (error) 760 allerror = error; 761 vput(vp); 762 } 763 764 return (allerror); 765 } 766 767 /* 768 * NFS flat namespace lookup. 769 * Currently unsupported. 770 */ 771 /* ARGSUSED */ 772 int 773 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 774 { 775 776 return (EOPNOTSUPP); 777 } 778 779 /* 780 * Do that sysctl thang... 781 */ 782 int 783 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 784 size_t newlen, struct proc *p) 785 { 786 int rv; 787 788 /* 789 * All names at this level are terminal. 790 */ 791 if(namelen > 1) 792 return ENOTDIR; /* overloaded */ 793 794 switch(name[0]) { 795 case NFS_NFSSTATS: 796 if(!oldp) { 797 *oldlenp = sizeof nfsstats; 798 return 0; 799 } 800 801 if(*oldlenp < sizeof nfsstats) { 802 *oldlenp = sizeof nfsstats; 803 return ENOMEM; 804 } 805 806 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 807 if(rv) return rv; 808 809 if(newp && newlen != sizeof nfsstats) 810 return EINVAL; 811 812 if(newp) { 813 return copyin(newp, &nfsstats, sizeof nfsstats); 814 } 815 return 0; 816 817 case NFS_NIOTHREADS: 818 nfs_getset_niothreads(0); 819 820 rv = sysctl_int(oldp, oldlenp, newp, newlen, &nfs_niothreads); 821 if (newp) 822 nfs_getset_niothreads(1); 823 824 return rv; 825 826 default: 827 return EOPNOTSUPP; 828 } 829 } 830 831 832 /* 833 * At this point, this should never happen 834 */ 835 /* ARGSUSED */ 836 int 837 nfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 838 { 839 return (EINVAL); 840 } 841 842 /* 843 * Vnode pointer to File handle, should never happen either 844 */ 845 /* ARGSUSED */ 846 int 847 nfs_vptofh(struct vnode *vp, struct fid *fhp) 848 { 849 return (EINVAL); 850 } 851 852 /* 853 * Vfs start routine, a no-op. 854 */ 855 /* ARGSUSED */ 856 int 857 nfs_start(struct mount *mp, int flags, struct proc *p) 858 { 859 return (0); 860 } 861 862 /* 863 * Do operations associated with quotas, not supported 864 */ 865 /* ARGSUSED */ 866 int 867 nfs_quotactl(struct mount *mp, int cmd, uid_t uid, caddr_t arg, struct proc *p) 868 { 869 return (EOPNOTSUPP); 870 } 871 872 /* 873 * check export permission, not supported 874 */ 875 /* ARGUSED */ 876 int 877 nfs_checkexp(struct mount *mp, struct mbuf *nam, int *exflagsp, 878 struct ucred **credanonp) 879 { 880 return (EOPNOTSUPP); 881 } 882 883