1 /* $OpenBSD: nfs_vfsops.c,v 1.95 2013/01/16 04:05:22 deraadt 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 /* 239 * Mount a remote root fs via. NFS. It goes like this: 240 * - Call nfs_boot_init() to fill in the nfs_diskless struct 241 * (using RARP, bootparam RPC, mountd RPC) 242 * - hand craft the swap nfs vnode hanging off a fake mount point 243 * if swdevt[0].sw_dev == NODEV 244 * - build the rootfs mount point and call mountnfs() to do the rest. 245 */ 246 int 247 nfs_mountroot(void) 248 { 249 struct nfs_diskless nd; 250 struct vattr attr; 251 struct mount *mp; 252 struct vnode *vp; 253 struct proc *procp; 254 long n; 255 int error; 256 257 procp = curproc; /* XXX */ 258 259 /* 260 * Call nfs_boot_init() to fill in the nfs_diskless struct. 261 * Side effect: Finds and configures a network interface. 262 */ 263 bzero((caddr_t) &nd, sizeof(nd)); 264 nfs_boot_init(&nd, procp); 265 266 /* 267 * Create the root mount point. 268 */ 269 if (nfs_boot_getfh(&nd.nd_boot, "root", &nd.nd_root, -1)) 270 panic("nfs_mountroot: root"); 271 mp = nfs_mount_diskless(&nd.nd_root, "/", 0); 272 nfs_root(mp, &rootvp); 273 printf("root on %s\n", nd.nd_root.ndm_host); 274 275 /* 276 * Link it into the mount list. 277 */ 278 CIRCLEQ_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(nd.swap_ucred.cr_uid); 293 proc0.p_ucred->cr_gid = ntohl(nd.swap_ucred.cr_gid); 294 if ((proc0.p_ucred->cr_ngroups = ntohs(nd.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(nd.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 (bdevvp(swapdev, &swapdev_vp)) 308 panic("nfs_mountroot: can't setup swap vp"); 309 if (swdevt[0].sw_dev != NODEV) { 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(&nd.nd_boot, "swap", &nd.nd_swap, 5); 322 if (!error) { 323 mp = nfs_mount_diskless(&nd.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 * XXX-smurph 338 */ 339 swdevt[0].sw_dev = NETDEV; 340 /* end hack */ 341 swdevt[0].sw_vp = vp; 342 343 /* 344 * Find out how large the swap file is. 345 */ 346 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 347 if (error) 348 printf("nfs_mountroot: getattr for swap\n"); 349 n = (long) (attr.va_size >> DEV_BSHIFT); 350 351 printf("swap on %s\n", nd.nd_swap.ndm_host); 352 #ifdef DEBUG 353 printf("swap size: 0x%lx (blocks)\n", n); 354 #endif 355 return (0); 356 } 357 358 printf("WARNING: no swap\n"); 359 swdevt[0].sw_dev = NODEV; 360 swdevt[0].sw_vp = NULL; 361 362 return (0); 363 } 364 365 /* 366 * Internal version of mount system call for diskless setup. 367 */ 368 struct mount * 369 nfs_mount_diskless(struct nfs_dlmount *ndmntp, char *mntname, int mntflag) 370 { 371 struct nfs_args args; 372 struct mount *mp; 373 struct mbuf *m; 374 int error; 375 376 if (vfs_rootmountalloc("nfs", mntname, &mp)) 377 panic("nfs_mount_diskless: vfs_rootmountalloc failed"); 378 mp->mnt_flag |= mntflag; 379 380 /* Initialize mount args. */ 381 bzero((caddr_t) &args, sizeof(args)); 382 args.addr = (struct sockaddr *)&ndmntp->ndm_saddr; 383 args.addrlen = args.addr->sa_len; 384 args.sotype = SOCK_DGRAM; 385 args.fh = ndmntp->ndm_fh; 386 args.fhsize = NFSX_V2FH; 387 args.hostname = ndmntp->ndm_host; 388 389 #ifdef NFS_BOOT_OPTIONS 390 args.flags |= NFS_BOOT_OPTIONS; 391 #endif 392 #ifdef NFS_BOOT_RWSIZE 393 /* 394 * Reduce rsize,wsize for interfaces that consistently 395 * drop fragments of long UDP messages. (i.e. wd8003). 396 * You can always change these later via remount. 397 */ 398 args.flags |= NFSMNT_WSIZE | NFSMNT_RSIZE; 399 args.wsize = NFS_BOOT_RWSIZE; 400 args.rsize = NFS_BOOT_RWSIZE; 401 #endif 402 403 /* Get mbuf for server sockaddr. */ 404 m = m_get(M_WAIT, MT_SONAME); 405 bcopy((caddr_t)args.addr, mtod(m, caddr_t), 406 (m->m_len = args.addr->sa_len)); 407 408 error = mountnfs(&args, mp, m, mntname, args.hostname); 409 if (error) 410 panic("nfs_mountroot: mount %s failed: %d", mntname, error); 411 412 return (mp); 413 } 414 415 void 416 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, 417 struct nfs_args *nargp) 418 { 419 int s; 420 int adjsock = 0; 421 int maxio; 422 423 s = splsoftnet(); 424 425 #if 0 426 /* Re-bind if rsrvd port requested and wasn't on one */ 427 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 428 && (argp->flags & NFSMNT_RESVPORT); 429 #endif 430 /* Also re-bind if we're switching to/from a connected UDP socket */ 431 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 432 (argp->flags & NFSMNT_NOCONN)); 433 434 /* Update flags atomically. Don't change the lock bits. */ 435 nmp->nm_flag = 436 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 437 splx(s); 438 439 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 440 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 441 if (nmp->nm_timeo < NFS_MINTIMEO) 442 nmp->nm_timeo = NFS_MINTIMEO; 443 else if (nmp->nm_timeo > NFS_MAXTIMEO) 444 nmp->nm_timeo = NFS_MAXTIMEO; 445 } 446 447 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) 448 nmp->nm_retry = MIN(argp->retrans, NFS_MAXREXMIT); 449 if (!(nmp->nm_flag & NFSMNT_SOFT)) 450 nmp->nm_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 451 452 if (argp->flags & NFSMNT_NFSV3) { 453 if (argp->sotype == SOCK_DGRAM) 454 maxio = NFS_MAXDGRAMDATA; 455 else 456 maxio = NFS_MAXDATA; 457 } else 458 maxio = NFS_V2MAXDATA; 459 460 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 461 int osize = nmp->nm_wsize; 462 nmp->nm_wsize = argp->wsize; 463 /* Round down to multiple of blocksize */ 464 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 465 if (nmp->nm_wsize <= 0) 466 nmp->nm_wsize = NFS_FABLKSIZE; 467 adjsock |= (nmp->nm_wsize != osize); 468 } 469 if (nmp->nm_wsize > maxio) 470 nmp->nm_wsize = maxio; 471 if (nmp->nm_wsize > MAXBSIZE) 472 nmp->nm_wsize = MAXBSIZE; 473 474 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 475 int osize = nmp->nm_rsize; 476 nmp->nm_rsize = argp->rsize; 477 /* Round down to multiple of blocksize */ 478 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 479 if (nmp->nm_rsize <= 0) 480 nmp->nm_rsize = NFS_FABLKSIZE; 481 adjsock |= (nmp->nm_rsize != osize); 482 } 483 if (nmp->nm_rsize > maxio) 484 nmp->nm_rsize = maxio; 485 if (nmp->nm_rsize > MAXBSIZE) 486 nmp->nm_rsize = MAXBSIZE; 487 488 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 489 nmp->nm_readdirsize = argp->readdirsize; 490 /* Round down to multiple of blocksize */ 491 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 492 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 493 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 494 } else if (argp->flags & NFSMNT_RSIZE) 495 nmp->nm_readdirsize = nmp->nm_rsize; 496 497 if (nmp->nm_readdirsize > maxio) 498 nmp->nm_readdirsize = maxio; 499 500 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 501 argp->maxgrouplist <= NFS_MAXGRPS) 502 nmp->nm_numgrps = argp->maxgrouplist; 503 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 504 argp->readahead <= NFS_MAXRAHEAD) 505 nmp->nm_readahead = argp->readahead; 506 if (argp->flags & NFSMNT_ACREGMIN && argp->acregmin >= 0) { 507 if (argp->acregmin > 0xffff) 508 nmp->nm_acregmin = 0xffff; 509 else 510 nmp->nm_acregmin = argp->acregmin; 511 } 512 if (argp->flags & NFSMNT_ACREGMAX && argp->acregmax >= 0) { 513 if (argp->acregmax > 0xffff) 514 nmp->nm_acregmax = 0xffff; 515 else 516 nmp->nm_acregmax = argp->acregmax; 517 } 518 if (nmp->nm_acregmin > nmp->nm_acregmax) 519 nmp->nm_acregmin = nmp->nm_acregmax; 520 521 if (argp->flags & NFSMNT_ACDIRMIN && argp->acdirmin >= 0) { 522 if (argp->acdirmin > 0xffff) 523 nmp->nm_acdirmin = 0xffff; 524 else 525 nmp->nm_acdirmin = argp->acdirmin; 526 } 527 if (argp->flags & NFSMNT_ACDIRMAX && argp->acdirmax >= 0) { 528 if (argp->acdirmax > 0xffff) 529 nmp->nm_acdirmax = 0xffff; 530 else 531 nmp->nm_acdirmax = argp->acdirmax; 532 } 533 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 534 nmp->nm_acdirmin = nmp->nm_acdirmax; 535 536 if (nmp->nm_so && adjsock) { 537 nfs_disconnect(nmp); 538 if (nmp->nm_sotype == SOCK_DGRAM) 539 while (nfs_connect(nmp, NULL)) { 540 printf("nfs_args: retrying connect\n"); 541 (void) tsleep((caddr_t)&lbolt, 542 PSOCK, "nfscon", 0); 543 } 544 } 545 546 /* Update nargp based on nmp */ 547 nargp->wsize = nmp->nm_wsize; 548 nargp->rsize = nmp->nm_rsize; 549 nargp->readdirsize = nmp->nm_readdirsize; 550 nargp->timeo = nmp->nm_timeo; 551 nargp->retrans = nmp->nm_retry; 552 nargp->maxgrouplist = nmp->nm_numgrps; 553 nargp->readahead = nmp->nm_readahead; 554 nargp->acregmin = nmp->nm_acregmin; 555 nargp->acregmax = nmp->nm_acregmax; 556 nargp->acdirmin = nmp->nm_acdirmin; 557 nargp->acdirmax = nmp->nm_acdirmax; 558 } 559 560 /* 561 * VFS Operations. 562 * 563 * mount system call 564 * It seems a bit dumb to copyinstr() the host here and then 565 * bcopy() it in mountnfs(), but I wanted to detect errors before 566 * doing the sockargs() call because sockargs() allocates an mbuf and 567 * an error after that means that I have to release the mbuf. 568 */ 569 /* ARGSUSED */ 570 int 571 nfs_mount(struct mount *mp, const char *path, void *data, 572 struct nameidata *ndp, struct proc *p) 573 { 574 int error; 575 struct nfs_args args; 576 struct mbuf *nam; 577 char hst[MNAMELEN]; 578 size_t len; 579 u_char nfh[NFSX_V3FHMAX]; 580 581 error = copyin(data, &args, sizeof(args.version)); 582 if (error) 583 return (error); 584 if (args.version == 3) { 585 error = copyin (data, (caddr_t)&args, 586 sizeof (struct nfs_args3)); 587 args.flags &= ~(NFSMNT_INTERNAL|NFSMNT_NOAC); 588 } else if (args.version == NFS_ARGSVERSION) { 589 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 590 args.flags &= ~NFSMNT_NOAC; /* XXX - compatibility */ 591 } else 592 return (EPROGMISMATCH); 593 if (error) 594 return (error); 595 596 if ((args.flags & (NFSMNT_NFSV3|NFSMNT_RDIRPLUS)) == NFSMNT_RDIRPLUS) 597 return (EINVAL); 598 599 if (nfs_niothreads < 0) { 600 nfs_niothreads = 4; 601 nfs_getset_niothreads(1); 602 } 603 604 if (mp->mnt_flag & MNT_UPDATE) { 605 struct nfsmount *nmp = VFSTONFS(mp); 606 607 if (nmp == NULL) 608 return (EIO); 609 /* 610 * When doing an update, we can't change from or to 611 * v3. 612 */ 613 args.flags = (args.flags & ~(NFSMNT_NFSV3)) | 614 (nmp->nm_flag & (NFSMNT_NFSV3)); 615 nfs_decode_args(nmp, &args, &mp->mnt_stat.mount_info.nfs_args); 616 return (0); 617 } 618 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 619 return (EINVAL); 620 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 621 if (error) 622 return (error); 623 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 624 if (error) 625 return (error); 626 bzero(&hst[len], MNAMELEN - len); 627 /* sockargs() call must be after above copyin() calls */ 628 error = sockargs(&nam, args.addr, args.addrlen, MT_SONAME); 629 if (error) 630 return (error); 631 args.fh = nfh; 632 error = mountnfs(&args, mp, nam, path, hst); 633 return (error); 634 } 635 636 /* 637 * Common code for mount and mountroot 638 */ 639 int 640 mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, 641 const char *pth, char *hst) 642 { 643 struct nfsmount *nmp; 644 int error; 645 646 if (mp->mnt_flag & MNT_UPDATE) { 647 nmp = VFSTONFS(mp); 648 /* update paths, file handles, etc, here XXX */ 649 m_freem(nam); 650 return (0); 651 } else { 652 nmp = malloc(sizeof(struct nfsmount), M_NFSMNT, 653 M_WAITOK|M_ZERO); 654 mp->mnt_data = (qaddr_t)nmp; 655 } 656 657 vfs_getnewfsid(mp); 658 nmp->nm_mountp = mp; 659 nmp->nm_timeo = NFS_TIMEO; 660 nmp->nm_retry = NFS_RETRANS; 661 nmp->nm_wsize = NFS_WSIZE; 662 nmp->nm_rsize = NFS_RSIZE; 663 nmp->nm_readdirsize = NFS_READDIRSIZE; 664 nmp->nm_numgrps = NFS_MAXGRPS; 665 nmp->nm_readahead = NFS_DEFRAHEAD; 666 nmp->nm_fhsize = argp->fhsize; 667 nmp->nm_acregmin = NFS_MINATTRTIMO; 668 nmp->nm_acregmax = NFS_MAXATTRTIMO; 669 nmp->nm_acdirmin = NFS_MINATTRTIMO; 670 nmp->nm_acdirmax = NFS_MAXATTRTIMO; 671 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 672 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_vfc->vfc_name, MFSNAMELEN); 673 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 674 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 675 bcopy(argp, &mp->mnt_stat.mount_info.nfs_args, sizeof(*argp)); 676 nmp->nm_nam = nam; 677 nfs_decode_args(nmp, argp, &mp->mnt_stat.mount_info.nfs_args); 678 679 RB_INIT(&nmp->nm_ntree); 680 TAILQ_INIT(&nmp->nm_reqsq); 681 timeout_set(&nmp->nm_rtimeout, nfs_timer, nmp); 682 683 /* Set up the sockets and per-host congestion */ 684 nmp->nm_sotype = argp->sotype; 685 nmp->nm_soproto = argp->proto; 686 687 /* 688 * For Connection based sockets (TCP,...) defer the connect until 689 * the first request, in case the server is not responding. 690 */ 691 if (nmp->nm_sotype == SOCK_DGRAM && 692 (error = nfs_connect(nmp, NULL))) 693 goto bad; 694 695 /* 696 * This is silly, but it has to be set so that vinifod() works. 697 * We do not want to do an nfs_statfs() here since we can get 698 * stuck on a dead server and we are holding a lock on the mount 699 * point. 700 */ 701 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 702 703 return (0); 704 bad: 705 nfs_disconnect(nmp); 706 free((caddr_t)nmp, M_NFSMNT); 707 m_freem(nam); 708 return (error); 709 } 710 711 /* unmount system call */ 712 int 713 nfs_unmount(struct mount *mp, int mntflags, struct proc *p) 714 { 715 struct nfsmount *nmp; 716 int error, flags; 717 718 nmp = VFSTONFS(mp); 719 flags = 0; 720 721 if (mntflags & MNT_FORCE) 722 flags |= FORCECLOSE; 723 724 error = vflush(mp, NULL, flags); 725 if (error) 726 return (error); 727 728 nfs_disconnect(nmp); 729 m_freem(nmp->nm_nam); 730 timeout_del(&nmp->nm_rtimeout); 731 free(nmp, M_NFSMNT); 732 return (0); 733 } 734 735 /* 736 * Return root of a filesystem 737 */ 738 int 739 nfs_root(struct mount *mp, struct vnode **vpp) 740 { 741 struct nfsmount *nmp; 742 struct nfsnode *np; 743 int error; 744 745 nmp = VFSTONFS(mp); 746 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 747 if (error) 748 return (error); 749 *vpp = NFSTOV(np); 750 return (0); 751 } 752 753 /* 754 * Flush out the buffer cache 755 */ 756 int 757 nfs_sync(struct mount *mp, int waitfor, struct ucred *cred, struct proc *p) 758 { 759 struct vnode *vp; 760 int error, allerror = 0; 761 762 /* 763 * Don't traverse the vnode list if we want to skip all of them. 764 */ 765 if (waitfor == MNT_LAZY) 766 return (allerror); 767 768 /* 769 * Force stale buffer cache information to be flushed. 770 */ 771 loop: 772 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 773 /* 774 * If the vnode that we are about to sync is no longer 775 * associated with this mount point, start over. 776 */ 777 if (vp->v_mount != mp) 778 goto loop; 779 if (VOP_ISLOCKED(vp) || LIST_FIRST(&vp->v_dirtyblkhd) == NULL) 780 continue; 781 if (vget(vp, LK_EXCLUSIVE, p)) 782 goto loop; 783 error = VOP_FSYNC(vp, cred, waitfor, p); 784 if (error) 785 allerror = error; 786 vput(vp); 787 } 788 789 return (allerror); 790 } 791 792 /* 793 * NFS flat namespace lookup. 794 * Currently unsupported. 795 */ 796 /* ARGSUSED */ 797 int 798 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 799 { 800 801 return (EOPNOTSUPP); 802 } 803 804 /* 805 * Do that sysctl thang... 806 */ 807 int 808 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 809 size_t newlen, struct proc *p) 810 { 811 int rv; 812 813 /* 814 * All names at this level are terminal. 815 */ 816 if(namelen > 1) 817 return ENOTDIR; /* overloaded */ 818 819 switch(name[0]) { 820 case NFS_NFSSTATS: 821 if(!oldp) { 822 *oldlenp = sizeof nfsstats; 823 return 0; 824 } 825 826 if(*oldlenp < sizeof nfsstats) { 827 *oldlenp = sizeof nfsstats; 828 return ENOMEM; 829 } 830 831 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 832 if(rv) return rv; 833 834 if(newp && newlen != sizeof nfsstats) 835 return EINVAL; 836 837 if(newp) { 838 return copyin(newp, &nfsstats, sizeof nfsstats); 839 } 840 return 0; 841 842 case NFS_NIOTHREADS: 843 nfs_getset_niothreads(0); 844 845 rv = sysctl_int(oldp, oldlenp, newp, newlen, &nfs_niothreads); 846 if (newp) 847 nfs_getset_niothreads(1); 848 849 return rv; 850 851 default: 852 return EOPNOTSUPP; 853 } 854 } 855 856 857 /* 858 * At this point, this should never happen 859 */ 860 /* ARGSUSED */ 861 int 862 nfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 863 { 864 return (EINVAL); 865 } 866 867 /* 868 * Vnode pointer to File handle, should never happen either 869 */ 870 /* ARGSUSED */ 871 int 872 nfs_vptofh(struct vnode *vp, struct fid *fhp) 873 { 874 return (EINVAL); 875 } 876 877 /* 878 * Vfs start routine, a no-op. 879 */ 880 /* ARGSUSED */ 881 int 882 nfs_start(struct mount *mp, int flags, struct proc *p) 883 { 884 return (0); 885 } 886 887 /* 888 * Do operations associated with quotas, not supported 889 */ 890 /* ARGSUSED */ 891 int 892 nfs_quotactl(struct mount *mp, int cmd, uid_t uid, caddr_t arg, struct proc *p) 893 { 894 return (EOPNOTSUPP); 895 } 896 897 /* 898 * check export permission, not supported 899 */ 900 /* ARGUSED */ 901 int 902 nfs_checkexp(struct mount *mp, struct mbuf *nam, int *exflagsp, 903 struct ucred **credanonp) 904 { 905 return (EOPNOTSUPP); 906 } 907 908