1 /* $OpenBSD: nfs_vfsops.c,v 1.91 2009/09/02 18:20:54 thib 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/buf.h> 48 #include <sys/mbuf.h> 49 #include <sys/dirent.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/systm.h> 53 #include <sys/sysctl.h> 54 #include <sys/queue.h> 55 56 #include <net/if.h> 57 #include <net/route.h> 58 #include <netinet/in.h> 59 60 #include <nfs/rpcv2.h> 61 #include <nfs/nfsproto.h> 62 #include <nfs/nfsnode.h> 63 #include <nfs/nfs.h> 64 #include <nfs/nfsmount.h> 65 #include <nfs/xdr_subs.h> 66 #include <nfs/nfsm_subs.h> 67 #include <nfs/nfsdiskless.h> 68 #include <nfs/nfs_var.h> 69 70 extern struct nfsstats nfsstats; 71 extern int nfs_ticks; 72 extern u_int32_t nfs_procids[NFS_NPROCS]; 73 74 int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t, struct proc *); 75 int nfs_checkexp(struct mount *, struct mbuf *, int *, struct ucred **); 76 struct mount *nfs_mount_diskless(struct nfs_dlmount *, char *, int); 77 78 /* 79 * nfs vfs operations. 80 */ 81 const struct vfsops nfs_vfsops = { 82 nfs_mount, 83 nfs_start, 84 nfs_unmount, 85 nfs_root, 86 nfs_quotactl, 87 nfs_statfs, 88 nfs_sync, 89 nfs_vget, 90 nfs_fhtovp, 91 nfs_vptofh, 92 nfs_vfs_init, 93 nfs_sysctl, 94 nfs_checkexp 95 }; 96 97 /* 98 * nfs statfs call 99 */ 100 int 101 nfs_statfs(mp, sbp, p) 102 struct mount *mp; 103 struct statfs *sbp; 104 struct proc *p; 105 { 106 struct vnode *vp; 107 struct nfs_statfs *sfp = NULL; 108 struct nfsm_info info; 109 u_int32_t *tl; 110 int32_t t1; 111 caddr_t cp2; 112 struct nfsmount *nmp = VFSTONFS(mp); 113 int error = 0, retattr; 114 struct ucred *cred; 115 struct nfsnode *np; 116 u_quad_t tquad; 117 118 info.nmi_v3 = (nmp->nm_flag & NFSMNT_NFSV3); 119 120 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 121 if (error) 122 return (error); 123 vp = NFSTOV(np); 124 cred = crget(); 125 cred->cr_ngroups = 0; 126 if (info.nmi_v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0) 127 (void)nfs_fsinfo(nmp, vp, cred, p); 128 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 129 info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3)); 130 nfsm_fhtom(&info, vp, info.nmi_v3); 131 132 info.nmi_procp = p; 133 info.nmi_cred = cred; 134 error = nfs_request(vp, NFSPROC_FSSTAT, &info); 135 if (info.nmi_v3) 136 nfsm_postop_attr(vp, retattr); 137 if (error) { 138 m_freem(info.nmi_mrep); 139 goto nfsmout; 140 } 141 142 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(info.nmi_v3)); 143 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 144 if (info.nmi_v3) { 145 sbp->f_bsize = NFS_FABLKSIZE; 146 tquad = fxdr_hyper(&sfp->sf_tbytes); 147 sbp->f_blocks = tquad / (u_quad_t)NFS_FABLKSIZE; 148 tquad = fxdr_hyper(&sfp->sf_fbytes); 149 sbp->f_bfree = tquad / (u_quad_t)NFS_FABLKSIZE; 150 tquad = fxdr_hyper(&sfp->sf_abytes); 151 sbp->f_bavail = (quad_t)tquad / (quad_t)NFS_FABLKSIZE; 152 153 tquad = fxdr_hyper(&sfp->sf_tfiles); 154 sbp->f_files = tquad; 155 tquad = fxdr_hyper(&sfp->sf_ffiles); 156 sbp->f_ffree = tquad; 157 sbp->f_favail = tquad; 158 sbp->f_namemax = MAXNAMLEN; 159 } else { 160 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 161 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 162 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 163 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 164 sbp->f_files = 0; 165 sbp->f_ffree = 0; 166 } 167 copy_statfs_info(sbp, mp); 168 m_freem(info.nmi_mrep); 169 nfsmout: 170 vrele(vp); 171 crfree(cred); 172 return (error); 173 } 174 175 /* 176 * nfs version 3 fsinfo rpc call 177 */ 178 int 179 nfs_fsinfo(nmp, vp, cred, p) 180 struct nfsmount *nmp; 181 struct vnode *vp; 182 struct ucred *cred; 183 struct proc *p; 184 { 185 struct nfsv3_fsinfo *fsp; 186 struct nfsm_info info; 187 int32_t t1; 188 u_int32_t *tl, pref, max; 189 caddr_t cp2; 190 int error = 0, retattr; 191 192 nfsstats.rpccnt[NFSPROC_FSINFO]++; 193 info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(1)); 194 nfsm_fhtom(&info, vp, 1); 195 196 info.nmi_procp = p; 197 info.nmi_cred = cred; 198 error = nfs_request(vp, NFSPROC_FSINFO, &info); 199 200 nfsm_postop_attr(vp, retattr); 201 if (error) { 202 m_freem(info.nmi_mrep); 203 goto nfsmout; 204 } 205 206 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 207 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 208 if (pref < nmp->nm_wsize) 209 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 210 ~(NFS_FABLKSIZE - 1); 211 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 212 if (max < nmp->nm_wsize) { 213 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 214 if (nmp->nm_wsize == 0) 215 nmp->nm_wsize = max; 216 } 217 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 218 if (pref < nmp->nm_rsize) 219 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 220 ~(NFS_FABLKSIZE - 1); 221 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 222 if (max < nmp->nm_rsize) { 223 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 224 if (nmp->nm_rsize == 0) 225 nmp->nm_rsize = max; 226 } 227 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 228 if (pref < nmp->nm_readdirsize) 229 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 230 ~(NFS_DIRBLKSIZ - 1); 231 if (max < nmp->nm_readdirsize) { 232 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 233 if (nmp->nm_readdirsize == 0) 234 nmp->nm_readdirsize = max; 235 } 236 nmp->nm_flag |= NFSMNT_GOTFSINFO; 237 238 m_freem(info.nmi_mrep); 239 nfsmout: 240 return (error); 241 } 242 243 /* 244 * Mount a remote root fs via. NFS. It goes like this: 245 * - Call nfs_boot_init() to fill in the nfs_diskless struct 246 * (using RARP, bootparam RPC, mountd RPC) 247 * - hand craft the swap nfs vnode hanging off a fake mount point 248 * if swdevt[0].sw_dev == NODEV 249 * - build the rootfs mount point and call mountnfs() to do the rest. 250 */ 251 int 252 nfs_mountroot() 253 { 254 struct nfs_diskless nd; 255 struct vattr attr; 256 struct mount *mp; 257 struct vnode *vp; 258 struct proc *procp; 259 long n; 260 int error; 261 262 procp = curproc; /* XXX */ 263 264 /* 265 * Call nfs_boot_init() to fill in the nfs_diskless struct. 266 * Side effect: Finds and configures a network interface. 267 */ 268 bzero((caddr_t) &nd, sizeof(nd)); 269 nfs_boot_init(&nd, procp); 270 271 /* 272 * Create the root mount point. 273 */ 274 if (nfs_boot_getfh(&nd.nd_boot, "root", &nd.nd_root, -1)) 275 panic("nfs_mountroot: root"); 276 mp = nfs_mount_diskless(&nd.nd_root, "/", 0); 277 nfs_root(mp, &rootvp); 278 printf("root on %s\n", nd.nd_root.ndm_host); 279 280 /* 281 * Link it into the mount list. 282 */ 283 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 284 vfs_unbusy(mp); 285 286 /* Get root attributes (for the time). */ 287 error = VOP_GETATTR(rootvp, &attr, procp->p_ucred, procp); 288 if (error) panic("nfs_mountroot: getattr for root"); 289 n = attr.va_atime.tv_sec; 290 #ifdef DEBUG 291 printf("root time: 0x%lx\n", n); 292 #endif 293 inittodr(n); 294 295 #ifdef notyet 296 /* Set up swap credentials. */ 297 proc0.p_ucred->cr_uid = ntohl(nd.swap_ucred.cr_uid); 298 proc0.p_ucred->cr_gid = ntohl(nd.swap_ucred.cr_gid); 299 if ((proc0.p_ucred->cr_ngroups = ntohs(nd.swap_ucred.cr_ngroups)) > 300 NGROUPS) 301 proc0.p_ucred->cr_ngroups = NGROUPS; 302 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 303 proc0.p_ucred->cr_groups[i] = ntohl(nd.swap_ucred.cr_groups[i]); 304 #endif 305 306 /* 307 * "Mount" the swap device. 308 * 309 * On a "dataless" configuration (swap on disk) we will have: 310 * (swdevt[0].sw_dev != NODEV) identifying the swap device. 311 */ 312 if (bdevvp(swapdev, &swapdev_vp)) 313 panic("nfs_mountroot: can't setup swap vp"); 314 if (swdevt[0].sw_dev != NODEV) { 315 printf("swap on device 0x%x\n", swdevt[0].sw_dev); 316 return (0); 317 } 318 319 /* 320 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV) 321 * Create a fake mount point just for the swap vnode so that the 322 * swap file can be on a different server from the rootfs. 323 * 324 * Wait 5 retries, finally no swap is cool. -mickey 325 */ 326 error = nfs_boot_getfh(&nd.nd_boot, "swap", &nd.nd_swap, 5); 327 if (!error) { 328 mp = nfs_mount_diskless(&nd.nd_swap, "/swap", 0); 329 nfs_root(mp, &vp); 330 vfs_unbusy(mp); 331 332 /* 333 * Since the swap file is not the root dir of a file system, 334 * hack it to a regular file. 335 */ 336 vp->v_type = VREG; 337 vp->v_flag = 0; 338 339 /* 340 * Next line is a hack to make swapmount() work on NFS swap files. 341 * XXX-smurph 342 */ 343 swdevt[0].sw_dev = NETDEV; 344 /* end hack */ 345 swdevt[0].sw_vp = vp; 346 347 /* 348 * Find out how large the swap file is. 349 */ 350 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 351 if (error) 352 printf("nfs_mountroot: getattr for swap\n"); 353 n = (long) (attr.va_size >> DEV_BSHIFT); 354 355 printf("swap on %s\n", nd.nd_swap.ndm_host); 356 #ifdef DEBUG 357 printf("swap size: 0x%lx (blocks)\n", n); 358 #endif 359 return (0); 360 } 361 362 printf("WARNING: no swap\n"); 363 swdevt[0].sw_dev = NODEV; 364 swdevt[0].sw_vp = NULL; 365 366 return (0); 367 } 368 369 /* 370 * Internal version of mount system call for diskless setup. 371 */ 372 struct mount * 373 nfs_mount_diskless(ndmntp, mntname, mntflag) 374 struct nfs_dlmount *ndmntp; 375 char *mntname; 376 int mntflag; 377 { 378 struct nfs_args args; 379 struct mount *mp; 380 struct mbuf *m; 381 int error; 382 383 if (vfs_rootmountalloc("nfs", mntname, &mp)) 384 panic("nfs_mount_diskless: vfs_rootmountalloc failed"); 385 mp->mnt_flag |= mntflag; 386 387 /* Initialize mount args. */ 388 bzero((caddr_t) &args, sizeof(args)); 389 args.addr = (struct sockaddr *)&ndmntp->ndm_saddr; 390 args.addrlen = args.addr->sa_len; 391 args.sotype = SOCK_DGRAM; 392 args.fh = ndmntp->ndm_fh; 393 args.fhsize = NFSX_V2FH; 394 args.hostname = ndmntp->ndm_host; 395 396 #ifdef NFS_BOOT_OPTIONS 397 args.flags |= NFS_BOOT_OPTIONS; 398 #endif 399 #ifdef NFS_BOOT_RWSIZE 400 /* 401 * Reduce rsize,wsize for interfaces that consistently 402 * drop fragments of long UDP messages. (i.e. wd8003). 403 * You can always change these later via remount. 404 */ 405 args.flags |= NFSMNT_WSIZE | NFSMNT_RSIZE; 406 args.wsize = NFS_BOOT_RWSIZE; 407 args.rsize = NFS_BOOT_RWSIZE; 408 #endif 409 410 /* Get mbuf for server sockaddr. */ 411 m = m_get(M_WAIT, MT_SONAME); 412 bcopy((caddr_t)args.addr, mtod(m, caddr_t), 413 (m->m_len = args.addr->sa_len)); 414 415 error = mountnfs(&args, mp, m, mntname, args.hostname); 416 if (error) 417 panic("nfs_mountroot: mount %s failed: %d", mntname, error); 418 419 return (mp); 420 } 421 422 void 423 nfs_decode_args(nmp, argp, nargp) 424 struct nfsmount *nmp; 425 struct nfs_args *argp; 426 struct nfs_args *nargp; 427 { 428 int s; 429 int adjsock = 0; 430 int maxio; 431 432 s = splsoftnet(); 433 434 #if 0 435 /* Re-bind if rsrvd port requested and wasn't on one */ 436 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 437 && (argp->flags & NFSMNT_RESVPORT); 438 #endif 439 /* Also re-bind if we're switching to/from a connected UDP socket */ 440 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 441 (argp->flags & NFSMNT_NOCONN)); 442 443 /* Update flags atomically. Don't change the lock bits. */ 444 nmp->nm_flag = 445 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 446 splx(s); 447 448 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 449 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 450 if (nmp->nm_timeo < NFS_MINTIMEO) 451 nmp->nm_timeo = NFS_MINTIMEO; 452 else if (nmp->nm_timeo > NFS_MAXTIMEO) 453 nmp->nm_timeo = NFS_MAXTIMEO; 454 } 455 456 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) 457 nmp->nm_retry = MIN(argp->retrans, NFS_MAXREXMIT); 458 if (!(nmp->nm_flag & NFSMNT_SOFT)) 459 nmp->nm_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 460 461 if (argp->flags & NFSMNT_NFSV3) { 462 if (argp->sotype == SOCK_DGRAM) 463 maxio = NFS_MAXDGRAMDATA; 464 else 465 maxio = NFS_MAXDATA; 466 } else 467 maxio = NFS_V2MAXDATA; 468 469 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 470 int osize = nmp->nm_wsize; 471 nmp->nm_wsize = argp->wsize; 472 /* Round down to multiple of blocksize */ 473 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 474 if (nmp->nm_wsize <= 0) 475 nmp->nm_wsize = NFS_FABLKSIZE; 476 adjsock |= (nmp->nm_wsize != osize); 477 } 478 if (nmp->nm_wsize > maxio) 479 nmp->nm_wsize = maxio; 480 if (nmp->nm_wsize > MAXBSIZE) 481 nmp->nm_wsize = MAXBSIZE; 482 483 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 484 int osize = nmp->nm_rsize; 485 nmp->nm_rsize = argp->rsize; 486 /* Round down to multiple of blocksize */ 487 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 488 if (nmp->nm_rsize <= 0) 489 nmp->nm_rsize = NFS_FABLKSIZE; 490 adjsock |= (nmp->nm_rsize != osize); 491 } 492 if (nmp->nm_rsize > maxio) 493 nmp->nm_rsize = maxio; 494 if (nmp->nm_rsize > MAXBSIZE) 495 nmp->nm_rsize = MAXBSIZE; 496 497 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 498 nmp->nm_readdirsize = argp->readdirsize; 499 /* Round down to multiple of blocksize */ 500 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 501 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 502 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 503 } else if (argp->flags & NFSMNT_RSIZE) 504 nmp->nm_readdirsize = nmp->nm_rsize; 505 506 if (nmp->nm_readdirsize > maxio) 507 nmp->nm_readdirsize = maxio; 508 509 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 510 argp->maxgrouplist <= NFS_MAXGRPS) 511 nmp->nm_numgrps = argp->maxgrouplist; 512 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 513 argp->readahead <= NFS_MAXRAHEAD) 514 nmp->nm_readahead = argp->readahead; 515 if (argp->flags & NFSMNT_ACREGMIN && argp->acregmin >= 0) { 516 if (argp->acregmin > 0xffff) 517 nmp->nm_acregmin = 0xffff; 518 else 519 nmp->nm_acregmin = argp->acregmin; 520 } 521 if (argp->flags & NFSMNT_ACREGMAX && argp->acregmax >= 0) { 522 if (argp->acregmax > 0xffff) 523 nmp->nm_acregmax = 0xffff; 524 else 525 nmp->nm_acregmax = argp->acregmax; 526 } 527 if (nmp->nm_acregmin > nmp->nm_acregmax) 528 nmp->nm_acregmin = nmp->nm_acregmax; 529 530 if (argp->flags & NFSMNT_ACDIRMIN && argp->acdirmin >= 0) { 531 if (argp->acdirmin > 0xffff) 532 nmp->nm_acdirmin = 0xffff; 533 else 534 nmp->nm_acdirmin = argp->acdirmin; 535 } 536 if (argp->flags & NFSMNT_ACDIRMAX && argp->acdirmax >= 0) { 537 if (argp->acdirmax > 0xffff) 538 nmp->nm_acdirmax = 0xffff; 539 else 540 nmp->nm_acdirmax = argp->acdirmax; 541 } 542 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 543 nmp->nm_acdirmin = nmp->nm_acdirmax; 544 545 if (nmp->nm_so && adjsock) { 546 nfs_disconnect(nmp); 547 if (nmp->nm_sotype == SOCK_DGRAM) 548 while (nfs_connect(nmp, NULL)) { 549 printf("nfs_args: retrying connect\n"); 550 (void) tsleep((caddr_t)&lbolt, 551 PSOCK, "nfscon", 0); 552 } 553 } 554 555 /* Update nargp based on nmp */ 556 nargp->wsize = nmp->nm_wsize; 557 nargp->rsize = nmp->nm_rsize; 558 nargp->readdirsize = nmp->nm_readdirsize; 559 nargp->timeo = nmp->nm_timeo; 560 nargp->retrans = nmp->nm_retry; 561 nargp->maxgrouplist = nmp->nm_numgrps; 562 nargp->readahead = nmp->nm_readahead; 563 nargp->acregmin = nmp->nm_acregmin; 564 nargp->acregmax = nmp->nm_acregmax; 565 nargp->acdirmin = nmp->nm_acdirmin; 566 nargp->acdirmax = nmp->nm_acdirmax; 567 } 568 569 /* 570 * VFS Operations. 571 * 572 * mount system call 573 * It seems a bit dumb to copyinstr() the host and path here and then 574 * bcopy() them in mountnfs(), but I wanted to detect errors before 575 * doing the sockargs() call because sockargs() allocates an mbuf and 576 * an error after that means that I have to release the mbuf. 577 */ 578 /* ARGSUSED */ 579 int 580 nfs_mount(mp, path, data, ndp, p) 581 struct mount *mp; 582 const char *path; 583 void *data; 584 struct nameidata *ndp; 585 struct proc *p; 586 { 587 int error; 588 struct nfs_args args; 589 struct mbuf *nam; 590 char pth[MNAMELEN], hst[MNAMELEN]; 591 size_t len; 592 u_char nfh[NFSX_V3FHMAX]; 593 594 error = copyin (data, &args, sizeof (args.version)); 595 if (error) 596 return (error); 597 if (args.version == 3) { 598 error = copyin (data, (caddr_t)&args, 599 sizeof (struct nfs_args3)); 600 args.flags &= ~(NFSMNT_INTERNAL|NFSMNT_NOAC); 601 } 602 else if (args.version == NFS_ARGSVERSION) { 603 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 604 args.flags &= ~NFSMNT_NOAC; /* XXX - compatibility */ 605 } 606 else 607 return (EPROGMISMATCH); 608 if (error) 609 return (error); 610 611 if ((args.flags & (NFSMNT_NFSV3|NFSMNT_RDIRPLUS)) == NFSMNT_RDIRPLUS) 612 return (EINVAL); 613 614 if (nfs_niothreads < 0) { 615 nfs_niothreads = 4; 616 nfs_getset_niothreads(1); 617 } 618 619 if (mp->mnt_flag & MNT_UPDATE) { 620 struct nfsmount *nmp = VFSTONFS(mp); 621 622 if (nmp == NULL) 623 return (EIO); 624 /* 625 * When doing an update, we can't change from or to 626 * v3. 627 */ 628 args.flags = (args.flags & ~(NFSMNT_NFSV3)) | 629 (nmp->nm_flag & (NFSMNT_NFSV3)); 630 nfs_decode_args(nmp, &args, &mp->mnt_stat.mount_info.nfs_args); 631 return (0); 632 } 633 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 634 return (EINVAL); 635 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 636 if (error) 637 return (error); 638 error = copyinstr(path, pth, MNAMELEN-1, &len); 639 if (error) 640 return (error); 641 bzero(&pth[len], MNAMELEN - len); 642 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 643 if (error) 644 return (error); 645 bzero(&hst[len], MNAMELEN - len); 646 /* sockargs() call must be after above copyin() calls */ 647 error = sockargs(&nam, args.addr, args.addrlen, MT_SONAME); 648 if (error) 649 return (error); 650 args.fh = nfh; 651 error = mountnfs(&args, mp, nam, pth, hst); 652 return (error); 653 } 654 655 /* 656 * Common code for mount and mountroot 657 */ 658 int 659 mountnfs(argp, mp, nam, pth, hst) 660 struct nfs_args *argp; 661 struct mount *mp; 662 struct mbuf *nam; 663 char *pth, *hst; 664 { 665 struct nfsmount *nmp; 666 int error; 667 668 if (mp->mnt_flag & MNT_UPDATE) { 669 nmp = VFSTONFS(mp); 670 /* update paths, file handles, etc, here XXX */ 671 m_freem(nam); 672 return (0); 673 } else { 674 nmp = malloc(sizeof(struct nfsmount), M_NFSMNT, 675 M_WAITOK|M_ZERO); 676 mp->mnt_data = (qaddr_t)nmp; 677 } 678 679 vfs_getnewfsid(mp); 680 nmp->nm_mountp = mp; 681 nmp->nm_timeo = NFS_TIMEO; 682 nmp->nm_retry = NFS_RETRANS; 683 nmp->nm_wsize = NFS_WSIZE; 684 nmp->nm_rsize = NFS_RSIZE; 685 nmp->nm_readdirsize = NFS_READDIRSIZE; 686 nmp->nm_numgrps = NFS_MAXGRPS; 687 nmp->nm_readahead = NFS_DEFRAHEAD; 688 nmp->nm_fhsize = argp->fhsize; 689 nmp->nm_acregmin = NFS_MINATTRTIMO; 690 nmp->nm_acregmax = NFS_MAXATTRTIMO; 691 nmp->nm_acdirmin = NFS_MINATTRTIMO; 692 nmp->nm_acdirmax = NFS_MAXATTRTIMO; 693 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 694 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_vfc->vfc_name, MFSNAMELEN); 695 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 696 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 697 bcopy(argp, &mp->mnt_stat.mount_info.nfs_args, sizeof(*argp)); 698 nmp->nm_nam = nam; 699 nfs_decode_args(nmp, argp, &mp->mnt_stat.mount_info.nfs_args); 700 701 RB_INIT(&nmp->nm_ntree); 702 TAILQ_INIT(&nmp->nm_reqsq); 703 timeout_set(&nmp->nm_rtimeout, nfs_timer, nmp); 704 705 /* Set up the sockets and per-host congestion */ 706 nmp->nm_sotype = argp->sotype; 707 nmp->nm_soproto = argp->proto; 708 709 /* 710 * For Connection based sockets (TCP,...) defer the connect until 711 * the first request, in case the server is not responding. 712 */ 713 if (nmp->nm_sotype == SOCK_DGRAM && 714 (error = nfs_connect(nmp, NULL))) 715 goto bad; 716 717 /* 718 * This is silly, but it has to be set so that vinifod() works. 719 * We do not want to do an nfs_statfs() here since we can get 720 * stuck on a dead server and we are holding a lock on the mount 721 * point. 722 */ 723 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 724 725 return (0); 726 bad: 727 nfs_disconnect(nmp); 728 free((caddr_t)nmp, M_NFSMNT); 729 m_freem(nam); 730 return (error); 731 } 732 733 /* unmount system call */ 734 int 735 nfs_unmount(struct mount *mp, int mntflags, struct proc *p) 736 { 737 struct nfsmount *nmp; 738 int error, flags; 739 740 nmp = VFSTONFS(mp); 741 flags = 0; 742 743 if (mntflags & MNT_FORCE) 744 flags |= FORCECLOSE; 745 746 error = vflush(mp, NULL, flags); 747 if (error) 748 return (error); 749 750 nfs_disconnect(nmp); 751 m_freem(nmp->nm_nam); 752 timeout_del(&nmp->nm_rtimeout); 753 free(nmp, M_NFSMNT); 754 return (0); 755 } 756 757 /* 758 * Return root of a filesystem 759 */ 760 int 761 nfs_root(mp, vpp) 762 struct mount *mp; 763 struct vnode **vpp; 764 { 765 struct nfsmount *nmp; 766 struct nfsnode *np; 767 int error; 768 769 nmp = VFSTONFS(mp); 770 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 771 if (error) 772 return (error); 773 *vpp = NFSTOV(np); 774 return (0); 775 } 776 777 /* 778 * Flush out the buffer cache 779 */ 780 int 781 nfs_sync(mp, waitfor, cred, p) 782 struct mount *mp; 783 int waitfor; 784 struct ucred *cred; 785 struct proc *p; 786 { 787 struct vnode *vp; 788 int error, allerror = 0; 789 790 /* 791 * Don't traverse the vnode list if we want to skip all of them. 792 */ 793 if (waitfor == MNT_LAZY) 794 return (allerror); 795 796 /* 797 * Force stale buffer cache information to be flushed. 798 */ 799 loop: 800 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 801 /* 802 * If the vnode that we are about to sync is no longer 803 * associated with this mount point, start over. 804 */ 805 if (vp->v_mount != mp) 806 goto loop; 807 if (VOP_ISLOCKED(vp) || LIST_FIRST(&vp->v_dirtyblkhd) == NULL) 808 continue; 809 if (vget(vp, LK_EXCLUSIVE, p)) 810 goto loop; 811 error = VOP_FSYNC(vp, cred, waitfor, p); 812 if (error) 813 allerror = error; 814 vput(vp); 815 } 816 817 return (allerror); 818 } 819 820 /* 821 * NFS flat namespace lookup. 822 * Currently unsupported. 823 */ 824 /* ARGSUSED */ 825 int 826 nfs_vget(mp, ino, vpp) 827 struct mount *mp; 828 ino_t ino; 829 struct vnode **vpp; 830 { 831 832 return (EOPNOTSUPP); 833 } 834 835 /* 836 * Do that sysctl thang... 837 */ 838 int 839 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 840 size_t newlen, struct proc *p) 841 { 842 int rv; 843 844 /* 845 * All names at this level are terminal. 846 */ 847 if(namelen > 1) 848 return ENOTDIR; /* overloaded */ 849 850 switch(name[0]) { 851 case NFS_NFSSTATS: 852 if(!oldp) { 853 *oldlenp = sizeof nfsstats; 854 return 0; 855 } 856 857 if(*oldlenp < sizeof nfsstats) { 858 *oldlenp = sizeof nfsstats; 859 return ENOMEM; 860 } 861 862 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 863 if(rv) return rv; 864 865 if(newp && newlen != sizeof nfsstats) 866 return EINVAL; 867 868 if(newp) { 869 return copyin(newp, &nfsstats, sizeof nfsstats); 870 } 871 return 0; 872 873 case NFS_NIOTHREADS: 874 nfs_getset_niothreads(0); 875 876 rv = sysctl_int(oldp, oldlenp, newp, newlen, &nfs_niothreads); 877 if (newp) 878 nfs_getset_niothreads(1); 879 880 return rv; 881 882 default: 883 return EOPNOTSUPP; 884 } 885 } 886 887 888 /* 889 * At this point, this should never happen 890 */ 891 /* ARGSUSED */ 892 int 893 nfs_fhtovp(mp, fhp, vpp) 894 struct mount *mp; 895 struct fid *fhp; 896 struct vnode **vpp; 897 { 898 899 return (EINVAL); 900 } 901 902 /* 903 * Vnode pointer to File handle, should never happen either 904 */ 905 /* ARGSUSED */ 906 int 907 nfs_vptofh(vp, fhp) 908 struct vnode *vp; 909 struct fid *fhp; 910 { 911 912 return (EINVAL); 913 } 914 915 /* 916 * Vfs start routine, a no-op. 917 */ 918 /* ARGSUSED */ 919 int 920 nfs_start(mp, flags, p) 921 struct mount *mp; 922 int flags; 923 struct proc *p; 924 { 925 926 return (0); 927 } 928 929 /* 930 * Do operations associated with quotas, not supported 931 */ 932 /* ARGSUSED */ 933 int 934 nfs_quotactl(mp, cmd, uid, arg, p) 935 struct mount *mp; 936 int cmd; 937 uid_t uid; 938 caddr_t arg; 939 struct proc *p; 940 { 941 942 return (EOPNOTSUPP); 943 } 944 945 /* 946 * check export permission, not supported 947 */ 948 /* ARGUSED */ 949 int 950 nfs_checkexp(mp, nam, exflagsp, credanonp) 951 struct mount *mp; 952 struct mbuf *nam; 953 int *exflagsp; 954 struct ucred **credanonp; 955 { 956 return (EOPNOTSUPP); 957 } 958 959