1 /* $OpenBSD: nfs_vfsops.c,v 1.81 2009/04/13 17:51:57 blambert 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 #define NQ_DEADTHRESH NQ_NEVERDEAD /* Default nm_deadthresh */ 71 #define NQ_NEVERDEAD 9 /* Greater than max. nm_timeouts */ 72 73 extern struct nfsstats nfsstats; 74 extern int nfs_ticks; 75 extern u_int32_t nfs_procids[NFS_NPROCS]; 76 77 int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t, struct proc *); 78 int nfs_checkexp(struct mount *, struct mbuf *, int *, struct ucred **); 79 struct mount *nfs_mount_diskless(struct nfs_dlmount *, char *, int); 80 81 /* 82 * nfs vfs operations. 83 */ 84 const struct vfsops nfs_vfsops = { 85 nfs_mount, 86 nfs_start, 87 nfs_unmount, 88 nfs_root, 89 nfs_quotactl, 90 nfs_statfs, 91 nfs_sync, 92 nfs_vget, 93 nfs_fhtovp, 94 nfs_vptofh, 95 nfs_vfs_init, 96 nfs_sysctl, 97 nfs_checkexp 98 }; 99 100 /* 101 * nfs statfs call 102 */ 103 int 104 nfs_statfs(mp, sbp, p) 105 struct mount *mp; 106 struct statfs *sbp; 107 struct proc *p; 108 { 109 struct vnode *vp; 110 struct nfs_statfs *sfp = NULL; 111 u_int32_t *tl; 112 int32_t t1; 113 caddr_t dpos, cp2; 114 struct nfsmount *nmp = VFSTONFS(mp); 115 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 116 struct mbuf *mreq, *mrep = NULL, *md, *mb; 117 struct ucred *cred; 118 struct nfsnode *np; 119 u_quad_t tquad; 120 121 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 122 if (error) 123 return (error); 124 vp = NFSTOV(np); 125 cred = crget(); 126 cred->cr_ngroups = 0; 127 if (v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0) 128 (void)nfs_fsinfo(nmp, vp, cred, p); 129 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 130 mb = mreq = nfsm_reqhead(NFSX_FH(v3)); 131 nfsm_fhtom(&mb, vp, v3); 132 nfsm_request(vp, NFSPROC_FSSTAT, p, cred); 133 if (v3) 134 nfsm_postop_attr(vp, retattr); 135 if (error) { 136 if (mrep != NULL) 137 m_freem(mrep); 138 goto nfsmout; 139 } 140 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 141 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 142 if (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(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(nmp, vp, cred, p) 178 struct nfsmount *nmp; 179 struct vnode *vp; 180 struct ucred *cred; 181 struct proc *p; 182 { 183 struct nfsv3_fsinfo *fsp; 184 int32_t t1; 185 u_int32_t *tl, pref, max; 186 caddr_t dpos, cp2; 187 int error = 0, retattr; 188 struct mbuf *mreq, *mrep, *md, *mb; 189 190 nfsstats.rpccnt[NFSPROC_FSINFO]++; 191 mb = mreq = nfsm_reqhead(NFSX_FH(1)); 192 nfsm_fhtom(&mb, vp, 1); 193 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 194 nfsm_postop_attr(vp, retattr); 195 if (!error) { 196 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 197 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 198 if (pref < nmp->nm_wsize) 199 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 200 ~(NFS_FABLKSIZE - 1); 201 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 202 if (max < nmp->nm_wsize) { 203 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 204 if (nmp->nm_wsize == 0) 205 nmp->nm_wsize = max; 206 } 207 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 208 if (pref < nmp->nm_rsize) 209 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 210 ~(NFS_FABLKSIZE - 1); 211 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 212 if (max < nmp->nm_rsize) { 213 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 214 if (nmp->nm_rsize == 0) 215 nmp->nm_rsize = max; 216 } 217 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 218 if (pref < nmp->nm_readdirsize) 219 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 220 ~(NFS_DIRBLKSIZ - 1); 221 if (max < nmp->nm_readdirsize) { 222 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 223 if (nmp->nm_readdirsize == 0) 224 nmp->nm_readdirsize = max; 225 } 226 nmp->nm_flag |= NFSMNT_GOTFSINFO; 227 } 228 m_freem(mrep); 229 nfsmout: 230 return (error); 231 } 232 233 /* 234 * Mount a remote root fs via. NFS. It goes like this: 235 * - Call nfs_boot_init() to fill in the nfs_diskless struct 236 * (using RARP, bootparam RPC, mountd RPC) 237 * - hand craft the swap nfs vnode hanging off a fake mount point 238 * if swdevt[0].sw_dev == NODEV 239 * - build the rootfs mount point and call mountnfs() to do the rest. 240 */ 241 int 242 nfs_mountroot() 243 { 244 struct nfs_diskless nd; 245 struct vattr attr; 246 struct mount *mp; 247 struct vnode *vp; 248 struct proc *procp; 249 long n; 250 int error; 251 252 procp = curproc; /* XXX */ 253 254 /* 255 * Call nfs_boot_init() to fill in the nfs_diskless struct. 256 * Side effect: Finds and configures a network interface. 257 */ 258 bzero((caddr_t) &nd, sizeof(nd)); 259 nfs_boot_init(&nd, procp); 260 261 /* 262 * Create the root mount point. 263 */ 264 if (nfs_boot_getfh(&nd.nd_boot, "root", &nd.nd_root, -1)) 265 panic("nfs_mountroot: root"); 266 mp = nfs_mount_diskless(&nd.nd_root, "/", 0); 267 nfs_root(mp, &rootvp); 268 printf("root on %s\n", nd.nd_root.ndm_host); 269 270 /* 271 * Link it into the mount list. 272 */ 273 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 274 vfs_unbusy(mp); 275 276 /* Get root attributes (for the time). */ 277 error = VOP_GETATTR(rootvp, &attr, procp->p_ucred, procp); 278 if (error) panic("nfs_mountroot: getattr for root"); 279 n = attr.va_atime.tv_sec; 280 #ifdef DEBUG 281 printf("root time: 0x%lx\n", n); 282 #endif 283 inittodr(n); 284 285 #ifdef notyet 286 /* Set up swap credentials. */ 287 proc0.p_ucred->cr_uid = ntohl(nd.swap_ucred.cr_uid); 288 proc0.p_ucred->cr_gid = ntohl(nd.swap_ucred.cr_gid); 289 if ((proc0.p_ucred->cr_ngroups = ntohs(nd.swap_ucred.cr_ngroups)) > 290 NGROUPS) 291 proc0.p_ucred->cr_ngroups = NGROUPS; 292 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 293 proc0.p_ucred->cr_groups[i] = ntohl(nd.swap_ucred.cr_groups[i]); 294 #endif 295 296 /* 297 * "Mount" the swap device. 298 * 299 * On a "dataless" configuration (swap on disk) we will have: 300 * (swdevt[0].sw_dev != NODEV) identifying the swap device. 301 */ 302 if (bdevvp(swapdev, &swapdev_vp)) 303 panic("nfs_mountroot: can't setup swap vp"); 304 if (swdevt[0].sw_dev != NODEV) { 305 printf("swap on device 0x%x\n", swdevt[0].sw_dev); 306 return (0); 307 } 308 309 /* 310 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV) 311 * Create a fake mount point just for the swap vnode so that the 312 * swap file can be on a different server from the rootfs. 313 * 314 * Wait 5 retries, finally no swap is cool. -mickey 315 */ 316 error = nfs_boot_getfh(&nd.nd_boot, "swap", &nd.nd_swap, 5); 317 if (!error) { 318 mp = nfs_mount_diskless(&nd.nd_swap, "/swap", 0); 319 nfs_root(mp, &vp); 320 vfs_unbusy(mp); 321 322 /* 323 * Since the swap file is not the root dir of a file system, 324 * hack it to a regular file. 325 */ 326 vp->v_type = VREG; 327 vp->v_flag = 0; 328 329 /* 330 * Next line is a hack to make swapmount() work on NFS swap files. 331 * XXX-smurph 332 */ 333 swdevt[0].sw_dev = NETDEV; 334 /* end hack */ 335 swdevt[0].sw_vp = vp; 336 337 /* 338 * Find out how large the swap file is. 339 */ 340 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 341 if (error) 342 printf("nfs_mountroot: getattr for swap\n"); 343 n = (long) (attr.va_size >> DEV_BSHIFT); 344 345 printf("swap on %s\n", nd.nd_swap.ndm_host); 346 #ifdef DEBUG 347 printf("swap size: 0x%lx (blocks)\n", n); 348 #endif 349 return (0); 350 } 351 352 printf("WARNING: no swap\n"); 353 swdevt[0].sw_dev = NODEV; 354 swdevt[0].sw_vp = NULL; 355 356 return (0); 357 } 358 359 /* 360 * Internal version of mount system call for diskless setup. 361 */ 362 struct mount * 363 nfs_mount_diskless(ndmntp, mntname, mntflag) 364 struct nfs_dlmount *ndmntp; 365 char *mntname; 366 int mntflag; 367 { 368 struct nfs_args args; 369 struct mount *mp; 370 struct mbuf *m; 371 int error; 372 373 if (vfs_rootmountalloc("nfs", mntname, &mp)) 374 panic("nfs_mount_diskless: vfs_rootmountalloc failed"); 375 mp->mnt_flag |= mntflag; 376 377 /* Initialize mount args. */ 378 bzero((caddr_t) &args, sizeof(args)); 379 args.addr = (struct sockaddr *)&ndmntp->ndm_saddr; 380 args.addrlen = args.addr->sa_len; 381 args.sotype = SOCK_DGRAM; 382 args.fh = ndmntp->ndm_fh; 383 args.fhsize = NFSX_V2FH; 384 args.hostname = ndmntp->ndm_host; 385 386 #ifdef NFS_BOOT_OPTIONS 387 args.flags |= NFS_BOOT_OPTIONS; 388 #endif 389 #ifdef NFS_BOOT_RWSIZE 390 /* 391 * Reduce rsize,wsize for interfaces that consistently 392 * drop fragments of long UDP messages. (i.e. wd8003). 393 * You can always change these later via remount. 394 */ 395 args.flags |= NFSMNT_WSIZE | NFSMNT_RSIZE; 396 args.wsize = NFS_BOOT_RWSIZE; 397 args.rsize = NFS_BOOT_RWSIZE; 398 #endif 399 400 /* Get mbuf for server sockaddr. */ 401 m = m_get(M_WAIT, MT_SONAME); 402 bcopy((caddr_t)args.addr, mtod(m, caddr_t), 403 (m->m_len = args.addr->sa_len)); 404 405 error = mountnfs(&args, mp, m, mntname, args.hostname); 406 if (error) 407 panic("nfs_mountroot: mount %s failed: %d", mntname, error); 408 409 return (mp); 410 } 411 412 void 413 nfs_decode_args(nmp, argp, nargp) 414 struct nfsmount *nmp; 415 struct nfs_args *argp; 416 struct nfs_args *nargp; 417 { 418 int s; 419 int adjsock = 0; 420 int maxio; 421 422 s = splsoftnet(); 423 424 #if 0 425 /* Re-bind if rsrvd port requested and wasn't on one */ 426 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 427 && (argp->flags & NFSMNT_RESVPORT); 428 #endif 429 /* Also re-bind if we're switching to/from a connected UDP socket */ 430 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 431 (argp->flags & NFSMNT_NOCONN)); 432 433 /* Update flags atomically. Don't change the lock bits. */ 434 nmp->nm_flag = 435 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 436 splx(s); 437 438 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 439 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 440 if (nmp->nm_timeo < NFS_MINTIMEO) 441 nmp->nm_timeo = NFS_MINTIMEO; 442 else if (nmp->nm_timeo > NFS_MAXTIMEO) 443 nmp->nm_timeo = NFS_MAXTIMEO; 444 } 445 446 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 447 nmp->nm_retry = argp->retrans; 448 if (nmp->nm_retry > NFS_MAXREXMIT) 449 nmp->nm_retry = NFS_MAXREXMIT; 450 } 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_DEADTHRESH) && argp->deadthresh >= 1 && 507 argp->deadthresh <= NQ_NEVERDEAD) 508 nmp->nm_deadthresh = argp->deadthresh; 509 if (argp->flags & NFSMNT_ACREGMIN && argp->acregmin >= 0) { 510 if (argp->acregmin > 0xffff) 511 nmp->nm_acregmin = 0xffff; 512 else 513 nmp->nm_acregmin = argp->acregmin; 514 } 515 if (argp->flags & NFSMNT_ACREGMAX && argp->acregmax >= 0) { 516 if (argp->acregmax > 0xffff) 517 nmp->nm_acregmax = 0xffff; 518 else 519 nmp->nm_acregmax = argp->acregmax; 520 } 521 if (nmp->nm_acregmin > nmp->nm_acregmax) 522 nmp->nm_acregmin = nmp->nm_acregmax; 523 524 if (argp->flags & NFSMNT_ACDIRMIN && argp->acdirmin >= 0) { 525 if (argp->acdirmin > 0xffff) 526 nmp->nm_acdirmin = 0xffff; 527 else 528 nmp->nm_acdirmin = argp->acdirmin; 529 } 530 if (argp->flags & NFSMNT_ACDIRMAX && argp->acdirmax >= 0) { 531 if (argp->acdirmax > 0xffff) 532 nmp->nm_acdirmax = 0xffff; 533 else 534 nmp->nm_acdirmax = argp->acdirmax; 535 } 536 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 537 nmp->nm_acdirmin = nmp->nm_acdirmax; 538 539 if (nmp->nm_so && adjsock) { 540 nfs_disconnect(nmp); 541 if (nmp->nm_sotype == SOCK_DGRAM) 542 while (nfs_connect(nmp, (struct nfsreq *)0)) { 543 printf("nfs_args: retrying connect\n"); 544 (void) tsleep((caddr_t)&lbolt, 545 PSOCK, "nfscon", 0); 546 } 547 } 548 549 /* Update nargp based on nmp */ 550 nargp->wsize = nmp->nm_wsize; 551 nargp->rsize = nmp->nm_rsize; 552 nargp->readdirsize = nmp->nm_readdirsize; 553 nargp->timeo = nmp->nm_timeo; 554 nargp->retrans = nmp->nm_retry; 555 nargp->maxgrouplist = nmp->nm_numgrps; 556 nargp->readahead = nmp->nm_readahead; 557 nargp->deadthresh = nmp->nm_deadthresh; 558 nargp->acregmin = nmp->nm_acregmin; 559 nargp->acregmax = nmp->nm_acregmax; 560 nargp->acdirmin = nmp->nm_acdirmin; 561 nargp->acdirmax = nmp->nm_acdirmax; 562 } 563 564 /* 565 * VFS Operations. 566 * 567 * mount system call 568 * It seems a bit dumb to copyinstr() the host and path here and then 569 * bcopy() them in mountnfs(), but I wanted to detect errors before 570 * doing the sockargs() call because sockargs() allocates an mbuf and 571 * an error after that means that I have to release the mbuf. 572 */ 573 /* ARGSUSED */ 574 int 575 nfs_mount(mp, path, data, ndp, p) 576 struct mount *mp; 577 const char *path; 578 void *data; 579 struct nameidata *ndp; 580 struct proc *p; 581 { 582 int error; 583 struct nfs_args args; 584 struct mbuf *nam; 585 char pth[MNAMELEN], hst[MNAMELEN]; 586 size_t len; 587 u_char nfh[NFSX_V3FHMAX]; 588 589 error = copyin (data, &args, sizeof (args.version)); 590 if (error) 591 return (error); 592 if (args.version == 3) { 593 error = copyin (data, (caddr_t)&args, 594 sizeof (struct nfs_args3)); 595 args.flags &= ~(NFSMNT_INTERNAL|NFSMNT_NOAC); 596 } 597 else if (args.version == NFS_ARGSVERSION) { 598 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 599 args.flags &= ~NFSMNT_NOAC; /* XXX - compatibility */ 600 } 601 else 602 return (EPROGMISMATCH); 603 if (error) 604 return (error); 605 606 if ((args.flags & (NFSMNT_NFSV3|NFSMNT_RDIRPLUS)) == NFSMNT_RDIRPLUS) 607 return (EINVAL); 608 609 if (nfs_niothreads < 0) { 610 nfs_niothreads = 4; 611 nfs_getset_niothreads(1); 612 } 613 614 if (mp->mnt_flag & MNT_UPDATE) { 615 struct nfsmount *nmp = VFSTONFS(mp); 616 617 if (nmp == NULL) 618 return (EIO); 619 /* 620 * When doing an update, we can't change from or to 621 * v3. 622 */ 623 args.flags = (args.flags & ~(NFSMNT_NFSV3)) | 624 (nmp->nm_flag & (NFSMNT_NFSV3)); 625 nfs_decode_args(nmp, &args, &mp->mnt_stat.mount_info.nfs_args); 626 return (0); 627 } 628 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 629 return (EINVAL); 630 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 631 if (error) 632 return (error); 633 error = copyinstr(path, pth, MNAMELEN-1, &len); 634 if (error) 635 return (error); 636 bzero(&pth[len], MNAMELEN - len); 637 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 638 if (error) 639 return (error); 640 bzero(&hst[len], MNAMELEN - len); 641 /* sockargs() call must be after above copyin() calls */ 642 error = sockargs(&nam, args.addr, args.addrlen, MT_SONAME); 643 if (error) 644 return (error); 645 args.fh = nfh; 646 error = mountnfs(&args, mp, nam, pth, hst); 647 return (error); 648 } 649 650 /* 651 * Common code for mount and mountroot 652 */ 653 int 654 mountnfs(argp, mp, nam, pth, hst) 655 struct nfs_args *argp; 656 struct mount *mp; 657 struct mbuf *nam; 658 char *pth, *hst; 659 { 660 struct nfsmount *nmp; 661 int error; 662 663 if (mp->mnt_flag & MNT_UPDATE) { 664 nmp = VFSTONFS(mp); 665 /* update paths, file handles, etc, here XXX */ 666 m_freem(nam); 667 return (0); 668 } else { 669 nmp = malloc(sizeof(struct nfsmount), M_NFSMNT, 670 M_WAITOK|M_ZERO); 671 mp->mnt_data = (qaddr_t)nmp; 672 } 673 674 vfs_getnewfsid(mp); 675 nmp->nm_mountp = mp; 676 nmp->nm_timeo = NFS_TIMEO; 677 nmp->nm_retry = NFS_RETRANS; 678 nmp->nm_wsize = NFS_WSIZE; 679 nmp->nm_rsize = NFS_RSIZE; 680 nmp->nm_readdirsize = NFS_READDIRSIZE; 681 nmp->nm_numgrps = NFS_MAXGRPS; 682 nmp->nm_readahead = NFS_DEFRAHEAD; 683 nmp->nm_deadthresh = NQ_DEADTHRESH; 684 nmp->nm_fhsize = argp->fhsize; 685 nmp->nm_acregmin = NFS_MINATTRTIMO; 686 nmp->nm_acregmax = NFS_MAXATTRTIMO; 687 nmp->nm_acdirmin = NFS_MINATTRTIMO; 688 nmp->nm_acdirmax = NFS_MAXATTRTIMO; 689 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 690 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_vfc->vfc_name, MFSNAMELEN); 691 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 692 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 693 bcopy(argp, &mp->mnt_stat.mount_info.nfs_args, sizeof(*argp)); 694 nmp->nm_nam = nam; 695 nfs_decode_args(nmp, argp, &mp->mnt_stat.mount_info.nfs_args); 696 697 /* Set up the sockets and per-host congestion */ 698 nmp->nm_sotype = argp->sotype; 699 nmp->nm_soproto = argp->proto; 700 701 /* 702 * For Connection based sockets (TCP,...) defer the connect until 703 * the first request, in case the server is not responding. 704 */ 705 if (nmp->nm_sotype == SOCK_DGRAM && 706 (error = nfs_connect(nmp, (struct nfsreq *)0))) 707 goto bad; 708 709 /* 710 * This is silly, but it has to be set so that vinifod() works. 711 * We do not want to do an nfs_statfs() here since we can get 712 * stuck on a dead server and we are holding a lock on the mount 713 * point. 714 */ 715 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 716 717 return (0); 718 bad: 719 nfs_disconnect(nmp); 720 free((caddr_t)nmp, M_NFSMNT); 721 m_freem(nam); 722 return (error); 723 } 724 725 /* unmount system call */ 726 int 727 nfs_unmount(struct mount *mp, int mntflags, struct proc *p) 728 { 729 struct nfsmount *nmp; 730 int error, flags; 731 732 nmp = VFSTONFS(mp); 733 flags = 0; 734 735 if (mntflags & MNT_FORCE) 736 flags |= FORCECLOSE; 737 738 error = vflush(mp, NULL, flags); 739 if (error) 740 return (error); 741 742 nfs_disconnect(nmp); 743 m_freem(nmp->nm_nam); 744 free(nmp, M_NFSMNT); 745 return (0); 746 } 747 748 /* 749 * Return root of a filesystem 750 */ 751 int 752 nfs_root(mp, vpp) 753 struct mount *mp; 754 struct vnode **vpp; 755 { 756 struct nfsmount *nmp; 757 struct nfsnode *np; 758 int error; 759 760 nmp = VFSTONFS(mp); 761 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 762 if (error) 763 return (error); 764 *vpp = NFSTOV(np); 765 return (0); 766 } 767 768 /* 769 * Flush out the buffer cache 770 */ 771 int 772 nfs_sync(mp, waitfor, cred, p) 773 struct mount *mp; 774 int waitfor; 775 struct ucred *cred; 776 struct proc *p; 777 { 778 struct vnode *vp; 779 int error, allerror = 0; 780 781 /* 782 * Don't traverse the vnode list if we want to skip all of them. 783 */ 784 if (waitfor == MNT_LAZY) 785 return (allerror); 786 787 /* 788 * Force stale buffer cache information to be flushed. 789 */ 790 loop: 791 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 792 /* 793 * If the vnode that we are about to sync is no longer 794 * associated with this mount point, start over. 795 */ 796 if (vp->v_mount != mp) 797 goto loop; 798 if (VOP_ISLOCKED(vp) || LIST_FIRST(&vp->v_dirtyblkhd) == NULL) 799 continue; 800 if (vget(vp, LK_EXCLUSIVE, p)) 801 goto loop; 802 error = VOP_FSYNC(vp, cred, waitfor, p); 803 if (error) 804 allerror = error; 805 vput(vp); 806 } 807 808 return (allerror); 809 } 810 811 /* 812 * NFS flat namespace lookup. 813 * Currently unsupported. 814 */ 815 /* ARGSUSED */ 816 int 817 nfs_vget(mp, ino, vpp) 818 struct mount *mp; 819 ino_t ino; 820 struct vnode **vpp; 821 { 822 823 return (EOPNOTSUPP); 824 } 825 826 /* 827 * Do that sysctl thang... 828 */ 829 int 830 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 831 size_t newlen, struct proc *p) 832 { 833 int rv; 834 835 /* 836 * All names at this level are terminal. 837 */ 838 if(namelen > 1) 839 return ENOTDIR; /* overloaded */ 840 841 switch(name[0]) { 842 case NFS_NFSSTATS: 843 if(!oldp) { 844 *oldlenp = sizeof nfsstats; 845 return 0; 846 } 847 848 if(*oldlenp < sizeof nfsstats) { 849 *oldlenp = sizeof nfsstats; 850 return ENOMEM; 851 } 852 853 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 854 if(rv) return rv; 855 856 if(newp && newlen != sizeof nfsstats) 857 return EINVAL; 858 859 if(newp) { 860 return copyin(newp, &nfsstats, sizeof nfsstats); 861 } 862 return 0; 863 864 case NFS_NIOTHREADS: 865 nfs_getset_niothreads(0); 866 867 rv = sysctl_int(oldp, oldlenp, newp, newlen, &nfs_niothreads); 868 if (newp) 869 nfs_getset_niothreads(1); 870 871 return rv; 872 873 default: 874 return EOPNOTSUPP; 875 } 876 } 877 878 879 /* 880 * At this point, this should never happen 881 */ 882 /* ARGSUSED */ 883 int 884 nfs_fhtovp(mp, fhp, vpp) 885 struct mount *mp; 886 struct fid *fhp; 887 struct vnode **vpp; 888 { 889 890 return (EINVAL); 891 } 892 893 /* 894 * Vnode pointer to File handle, should never happen either 895 */ 896 /* ARGSUSED */ 897 int 898 nfs_vptofh(vp, fhp) 899 struct vnode *vp; 900 struct fid *fhp; 901 { 902 903 return (EINVAL); 904 } 905 906 /* 907 * Vfs start routine, a no-op. 908 */ 909 /* ARGSUSED */ 910 int 911 nfs_start(mp, flags, p) 912 struct mount *mp; 913 int flags; 914 struct proc *p; 915 { 916 917 return (0); 918 } 919 920 /* 921 * Do operations associated with quotas, not supported 922 */ 923 /* ARGSUSED */ 924 int 925 nfs_quotactl(mp, cmd, uid, arg, p) 926 struct mount *mp; 927 int cmd; 928 uid_t uid; 929 caddr_t arg; 930 struct proc *p; 931 { 932 933 return (EOPNOTSUPP); 934 } 935 936 /* 937 * check export permission, not supported 938 */ 939 /* ARGUSED */ 940 int 941 nfs_checkexp(mp, nam, exflagsp, credanonp) 942 struct mount *mp; 943 struct mbuf *nam; 944 int *exflagsp; 945 struct ucred **credanonp; 946 { 947 return (EOPNOTSUPP); 948 } 949 950