1 /* 2 * Copyright (c) 1989, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * %sccs.include.redist.c% 9 * 10 * @(#)nfs_vfsops.c 8.10 (Berkeley) 05/10/95 11 */ 12 13 #include <sys/param.h> 14 #include <sys/conf.h> 15 #include <sys/ioctl.h> 16 #include <sys/signal.h> 17 #include <sys/proc.h> 18 #include <sys/namei.h> 19 #include <sys/vnode.h> 20 #include <sys/kernel.h> 21 #include <sys/mount.h> 22 #include <sys/buf.h> 23 #include <sys/mbuf.h> 24 #include <sys/socket.h> 25 #include <sys/socketvar.h> 26 #include <sys/systm.h> 27 28 #include <net/if.h> 29 #include <net/route.h> 30 #include <netinet/in.h> 31 32 #include <nfs/rpcv2.h> 33 #include <nfs/nfsproto.h> 34 #include <nfs/nfsnode.h> 35 #include <nfs/nfs.h> 36 #include <nfs/nfsmount.h> 37 #include <nfs/xdr_subs.h> 38 #include <nfs/nfsm_subs.h> 39 #include <nfs/nfsdiskless.h> 40 #include <nfs/nqnfs.h> 41 42 struct nfsstats nfsstats; 43 static int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t, 44 struct proc *); 45 extern int nfs_ticks; 46 47 /* 48 * nfs vfs operations. 49 */ 50 struct vfsops nfs_vfsops = { 51 nfs_mount, 52 nfs_start, 53 nfs_unmount, 54 nfs_root, 55 nfs_quotactl, 56 nfs_statfs, 57 nfs_sync, 58 nfs_vget, 59 nfs_fhtovp, 60 nfs_vptofh, 61 nfs_init, 62 nfs_sysctl 63 }; 64 65 /* 66 * This structure must be filled in by a primary bootstrap or bootstrap 67 * server for a diskless/dataless machine. It is initialized below just 68 * to ensure that it is allocated to initialized data (.data not .bss). 69 */ 70 struct nfs_diskless nfs_diskless = { 0 }; 71 int nfs_diskless_valid = 0; 72 73 void nfs_disconnect __P((struct nfsmount *)); 74 void nfsargs_ntoh __P((struct nfs_args *)); 75 int nfs_fsinfo __P((struct nfsmount *, struct vnode *, struct ucred *, 76 struct proc *)); 77 static int nfs_mountdiskless __P((char *, char *, int, struct sockaddr_in *, 78 struct nfs_args *, struct vnode **, struct mount **)); 79 80 /* 81 * nfs statfs call 82 */ 83 int 84 nfs_statfs(mp, sbp, p) 85 struct mount *mp; 86 register struct statfs *sbp; 87 struct proc *p; 88 { 89 register struct vnode *vp; 90 register struct nfs_statfs *sfp; 91 register caddr_t cp; 92 register u_long *tl; 93 register long t1, t2; 94 caddr_t bpos, dpos, cp2; 95 struct nfsmount *nmp = VFSTONFS(mp); 96 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 97 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 98 struct ucred *cred; 99 struct nfsnode *np; 100 u_quad_t tquad; 101 102 #ifndef nolint 103 sfp = (struct nfs_statfs *)0; 104 #endif 105 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 106 if (error) 107 return (error); 108 vp = NFSTOV(np); 109 cred = crget(); 110 cred->cr_ngroups = 1; 111 if (v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0) 112 (void)nfs_fsinfo(nmp, vp, cred, p); 113 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 114 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 115 nfsm_fhtom(vp, v3); 116 nfsm_request(vp, NFSPROC_FSSTAT, p, cred); 117 if (v3) 118 nfsm_postop_attr(vp, retattr); 119 if (!error) 120 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 121 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 122 if (v3) { 123 sbp->f_bsize = NFS_FABLKSIZE; 124 fxdr_hyper(&sfp->sf_tbytes, &tquad); 125 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 126 fxdr_hyper(&sfp->sf_fbytes, &tquad); 127 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 128 fxdr_hyper(&sfp->sf_abytes, &tquad); 129 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 130 sbp->f_files = (fxdr_unsigned(long, sfp->sf_tfiles.nfsuquad[1]) 131 & 0x7fffffff); 132 sbp->f_ffree = (fxdr_unsigned(long, sfp->sf_ffiles.nfsuquad[1]) 133 & 0x7fffffff); 134 } else { 135 sbp->f_bsize = fxdr_unsigned(long, sfp->sf_bsize); 136 sbp->f_blocks = fxdr_unsigned(long, sfp->sf_blocks); 137 sbp->f_bfree = fxdr_unsigned(long, sfp->sf_bfree); 138 sbp->f_bavail = fxdr_unsigned(long, sfp->sf_bavail); 139 sbp->f_files = 0; 140 sbp->f_ffree = 0; 141 } 142 if (sbp != &mp->mnt_stat) { 143 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 144 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 145 } 146 nfsm_reqdone; 147 vrele(vp); 148 crfree(cred); 149 return (error); 150 } 151 152 /* 153 * nfs version 3 fsinfo rpc call 154 */ 155 int 156 nfs_fsinfo(nmp, vp, cred, p) 157 register struct nfsmount *nmp; 158 register struct vnode *vp; 159 struct ucred *cred; 160 struct proc *p; 161 { 162 register struct nfsv3_fsinfo *fsp; 163 register caddr_t cp; 164 register long t1, t2; 165 register u_long *tl, pref, max; 166 caddr_t bpos, dpos, cp2; 167 int error = 0, retattr; 168 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 169 170 nfsstats.rpccnt[NFSPROC_FSINFO]++; 171 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 172 nfsm_fhtom(vp, 1); 173 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 174 nfsm_postop_attr(vp, retattr); 175 if (!error) { 176 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 177 pref = fxdr_unsigned(u_long, fsp->fs_wtpref); 178 if (pref < nmp->nm_wsize) 179 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 180 ~(NFS_FABLKSIZE - 1); 181 max = fxdr_unsigned(u_long, fsp->fs_wtmax); 182 if (max < nmp->nm_wsize) { 183 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 184 if (nmp->nm_wsize == 0) 185 nmp->nm_wsize = max; 186 } 187 pref = fxdr_unsigned(u_long, fsp->fs_rtpref); 188 if (pref < nmp->nm_rsize) 189 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 190 ~(NFS_FABLKSIZE - 1); 191 max = fxdr_unsigned(u_long, fsp->fs_rtmax); 192 if (max < nmp->nm_rsize) { 193 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 194 if (nmp->nm_rsize == 0) 195 nmp->nm_rsize = max; 196 } 197 pref = fxdr_unsigned(u_long, fsp->fs_dtpref); 198 if (pref < nmp->nm_readdirsize) 199 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 200 ~(NFS_DIRBLKSIZ - 1); 201 if (max < nmp->nm_readdirsize) { 202 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 203 if (nmp->nm_readdirsize == 0) 204 nmp->nm_readdirsize = max; 205 } 206 nmp->nm_flag |= NFSMNT_GOTFSINFO; 207 } 208 nfsm_reqdone; 209 return (error); 210 } 211 212 /* 213 * Mount a remote root fs via. nfs. This depends on the info in the 214 * nfs_diskless structure that has been filled in properly by some primary 215 * bootstrap. 216 * It goes something like this: 217 * - do enough of "ifconfig" by calling ifioctl() so that the system 218 * can talk to the server 219 * - If nfs_diskless.mygateway is filled in, use that address as 220 * a default gateway. 221 * - hand craft the swap nfs vnode hanging off a fake mount point 222 * if swdevt[0].sw_dev == NODEV 223 * - build the rootfs mount point and call mountnfs() to do the rest. 224 */ 225 int 226 nfs_mountroot() 227 { 228 struct mount *mp; 229 struct nfs_diskless *nd = &nfs_diskless; 230 struct socket *so; 231 struct vnode *vp; 232 struct proc *p = curproc; /* XXX */ 233 int error, i; 234 u_long l; 235 char buf[128]; 236 237 /* 238 * XXX time must be non-zero when we init the interface or else 239 * the arp code will wedge... 240 */ 241 if (time.tv_sec == 0) 242 time.tv_sec = 1; 243 244 /* 245 * XXX splnet, so networks will receive... 246 */ 247 splnet(); 248 249 #ifdef notyet 250 /* Set up swap credentials. */ 251 proc0.p_ucred->cr_uid = ntohl(nd->swap_ucred.cr_uid); 252 proc0.p_ucred->cr_gid = ntohl(nd->swap_ucred.cr_gid); 253 if ((proc0.p_ucred->cr_ngroups = ntohs(nd->swap_ucred.cr_ngroups)) > 254 NGROUPS) 255 proc0.p_ucred->cr_ngroups = NGROUPS; 256 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 257 proc0.p_ucred->cr_groups[i] = ntohl(nd->swap_ucred.cr_groups[i]); 258 #endif 259 260 /* 261 * Do enough of ifconfig(8) so that the critical net interface can 262 * talk to the server. 263 */ 264 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0); 265 if (error) { 266 printf("nfs_mountroot: socreate(%04x): %d", 267 nd->myif.ifra_addr.sa_family, error); 268 return (error); 269 } 270 271 /* 272 * We might not have been told the right interface, so we pass 273 * over the first ten interfaces of the same kind, until we get 274 * one of them configured. 275 */ 276 277 for (i = strlen(nd->myif.ifra_name) - 1; 278 nd->myif.ifra_name[i] >= '0' && 279 nd->myif.ifra_name[i] <= '9'; 280 nd->myif.ifra_name[i] ++) { 281 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, p); 282 if(!error) 283 break; 284 } 285 if (error) { 286 printf("nfs_mountroot: SIOCAIFADDR: %d", error); 287 return (error); 288 } 289 soclose(so); 290 291 /* 292 * If the gateway field is filled in, set it as the default route. 293 */ 294 if (nd->mygateway.sin_len != 0) { 295 struct sockaddr_in mask, sin; 296 297 bzero((caddr_t)&mask, sizeof(mask)); 298 sin = mask; 299 sin.sin_family = AF_INET; 300 sin.sin_len = sizeof(sin); 301 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin, 302 (struct sockaddr *)&nd->mygateway, 303 (struct sockaddr *)&mask, 304 RTF_UP | RTF_GATEWAY, (struct rtentry **)0); 305 if (error) { 306 printf("nfs_mountroot: RTM_ADD: %d", error); 307 return (error); 308 } 309 } 310 311 if (nd->swap_nblks) { 312 /* 313 * Create a fake mount point just for the swap vnode so that the 314 * swap file can be on a different server from the rootfs. 315 */ 316 nd->swap_args.fh = nd->swap_fh; 317 /* 318 * If using nfsv3_diskless, replace NFSX_V2FH with 319 * nd->swap_fhsize. 320 */ 321 nd->swap_args.fhsize = NFSX_V2FH; 322 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 323 sprintf(buf,"%ld.%ld.%ld.%ld:%s", 324 (l >> 24) & 0xff, (l >> 16) & 0xff, 325 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 326 printf("NFS SWAP: %s\n",buf); 327 if (error = nfs_mountdiskless(buf, "/swap", 0, 328 &nd->swap_saddr, &nd->swap_args, &vp, &mp)) 329 return (error); 330 331 for (i=0;swdevt[i].sw_dev != NODEV;i++) ; 332 333 /* 334 * Since the swap file is not the root dir of a file system, 335 * hack it to a regular file. 336 */ 337 vp->v_type = VREG; 338 vp->v_flag = 0; 339 swapdev_vp = vp; 340 VREF(vp); 341 swdevt[i].sw_vp = vp; 342 swdevt[i].sw_nblks = nd->swap_nblks*2; 343 344 if (!swdevt[i].sw_nblks) { 345 swdevt[i].sw_nblks = 2048; 346 printf("defaulting to %d kbyte.\n", 347 swdevt[i].sw_nblks/2); 348 } else 349 printf("using %d kbyte.\n",swdevt[i].sw_nblks/2); 350 } 351 352 /* 353 * Create the rootfs mount point. 354 */ 355 nd->root_args.fh = nd->root_fh; 356 /* 357 * If using nfsv3_diskless, replace NFSX_V2FH with nd->root_fhsize. 358 */ 359 nd->root_args.fhsize = NFSX_V2FH; 360 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 361 sprintf(buf,"%ld.%ld.%ld.%ld:%s", 362 (l >> 24) & 0xff, (l >> 16) & 0xff, 363 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 364 printf("NFS ROOT: %s\n",buf); 365 if (error = nfs_mountdiskless(buf, "/", MNT_RDONLY, 366 &nd->root_saddr, &nd->root_args, &vp, &mp)) 367 return (error); 368 369 if (error = vfs_lock(mp)) { 370 printf("nfs_mountroot: vfs_lock"); 371 return (error); 372 } 373 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 374 vfs_unlock(mp); 375 rootvp = vp; 376 377 /* 378 * This is not really an nfs issue, but it is much easier to 379 * set hostname here and then let the "/etc/rc.xxx" files 380 * mount the right /var based upon its preset value. 381 */ 382 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 383 hostname[MAXHOSTNAMELEN - 1] = '\0'; 384 for (i = 0; i < MAXHOSTNAMELEN; i++) 385 if (hostname[i] == '\0') 386 break; 387 hostnamelen = i; 388 inittodr(ntohl(nd->root_time)); 389 return (0); 390 } 391 392 /* 393 * Internal version of mount system call for diskless setup. 394 */ 395 static int 396 nfs_mountdiskless(path, which, mountflag, sin, args, vpp, mpp) 397 char *path; 398 char *which; 399 int mountflag; 400 struct sockaddr_in *sin; 401 struct nfs_args *args; 402 struct vnode **vpp; 403 struct mount **mpp; 404 { 405 struct mount *mp; 406 struct mbuf *m; 407 int error; 408 409 if (error = vfs_rootmountalloc("nfs", path, &mp)) { 410 printf("nfs_mountroot: NFS not configured"); 411 return (error); 412 } 413 mp->mnt_flag = mountflag; 414 MGET(m, MT_SONAME, M_DONTWAIT); 415 if (m == NULL) { 416 printf("nfs_mountroot: %s mount mbuf", which); 417 return (error); 418 } 419 bcopy((caddr_t)sin, mtod(m, caddr_t), sin->sin_len); 420 m->m_len = sin->sin_len; 421 if (error = mountnfs(args, mp, m, which, path, vpp)) { 422 printf("nfs_mountroot: mount %s on %s: %d", path, which, error); 423 return (error); 424 } 425 (void) copystr(which, mp->mnt_stat.f_mntonname, MNAMELEN - 1, 0); 426 *mpp = mp; 427 return (0); 428 } 429 430 /* 431 * VFS Operations. 432 * 433 * mount system call 434 * It seems a bit dumb to copyinstr() the host and path here and then 435 * bcopy() them in mountnfs(), but I wanted to detect errors before 436 * doing the sockargs() call because sockargs() allocates an mbuf and 437 * an error after that means that I have to release the mbuf. 438 */ 439 /* ARGSUSED */ 440 int 441 nfs_mount(mp, path, data, ndp, p) 442 struct mount *mp; 443 char *path; 444 caddr_t data; 445 struct nameidata *ndp; 446 struct proc *p; 447 { 448 int error; 449 struct nfs_args args; 450 struct mbuf *nam; 451 struct vnode *vp; 452 char pth[MNAMELEN], hst[MNAMELEN]; 453 u_int len; 454 u_char nfh[NFSX_V3FHMAX]; 455 456 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 457 if (error) 458 return (error); 459 if (args.version != NFS_ARGSVERSION) 460 return (EPROGMISMATCH); 461 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 462 if (error) 463 return (error); 464 error = copyinstr(path, pth, MNAMELEN-1, &len); 465 if (error) 466 return (error); 467 bzero(&pth[len], MNAMELEN - len); 468 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 469 if (error) 470 return (error); 471 bzero(&hst[len], MNAMELEN - len); 472 /* sockargs() call must be after above copyin() calls */ 473 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 474 if (error) 475 return (error); 476 args.fh = nfh; 477 error = mountnfs(&args, mp, nam, pth, hst, &vp); 478 return (error); 479 } 480 481 /* 482 * Common code for mount and mountroot 483 */ 484 int 485 mountnfs(argp, mp, nam, pth, hst, vpp) 486 register struct nfs_args *argp; 487 register struct mount *mp; 488 struct mbuf *nam; 489 char *pth, *hst; 490 struct vnode **vpp; 491 { 492 register struct nfsmount *nmp; 493 struct nfsnode *np; 494 int error, maxio; 495 496 if (mp->mnt_flag & MNT_UPDATE) { 497 nmp = VFSTONFS(mp); 498 /* update paths, file handles, etc, here XXX */ 499 m_freem(nam); 500 return (0); 501 } else { 502 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 503 M_NFSMNT, M_WAITOK); 504 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 505 TAILQ_INIT(&nmp->nm_uidlruhead); 506 mp->mnt_data = (qaddr_t)nmp; 507 } 508 vfs_getnewfsid(mp); 509 nmp->nm_mountp = mp; 510 nmp->nm_flag = argp->flags; 511 if (nmp->nm_flag & NFSMNT_NQNFS) 512 /* 513 * We have to set mnt_maxsymlink to a non-zero value so 514 * that COMPAT_43 routines will know that we are setting 515 * the d_type field in directories (and can zero it for 516 * unsuspecting binaries). 517 */ 518 mp->mnt_maxsymlinklen = 1; 519 nmp->nm_timeo = NFS_TIMEO; 520 nmp->nm_retry = NFS_RETRANS; 521 nmp->nm_wsize = NFS_WSIZE; 522 nmp->nm_rsize = NFS_RSIZE; 523 nmp->nm_readdirsize = NFS_READDIRSIZE; 524 nmp->nm_numgrps = NFS_MAXGRPS; 525 nmp->nm_readahead = NFS_DEFRAHEAD; 526 nmp->nm_leaseterm = NQ_DEFLEASE; 527 nmp->nm_deadthresh = NQ_DEADTHRESH; 528 CIRCLEQ_INIT(&nmp->nm_timerhead); 529 nmp->nm_inprog = NULLVP; 530 nmp->nm_fhsize = argp->fhsize; 531 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 532 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 533 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 534 nmp->nm_nam = nam; 535 536 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 537 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 538 if (nmp->nm_timeo < NFS_MINTIMEO) 539 nmp->nm_timeo = NFS_MINTIMEO; 540 else if (nmp->nm_timeo > NFS_MAXTIMEO) 541 nmp->nm_timeo = NFS_MAXTIMEO; 542 } 543 544 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 545 nmp->nm_retry = argp->retrans; 546 if (nmp->nm_retry > NFS_MAXREXMIT) 547 nmp->nm_retry = NFS_MAXREXMIT; 548 } 549 550 if (argp->flags & NFSMNT_NFSV3) { 551 if (argp->sotype == SOCK_DGRAM) 552 maxio = NFS_MAXDGRAMDATA; 553 else 554 maxio = NFS_MAXDATA; 555 } else 556 maxio = NFS_V2MAXDATA; 557 558 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 559 nmp->nm_wsize = argp->wsize; 560 /* Round down to multiple of blocksize */ 561 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 562 if (nmp->nm_wsize <= 0) 563 nmp->nm_wsize = NFS_FABLKSIZE; 564 } 565 if (nmp->nm_wsize > maxio) 566 nmp->nm_wsize = maxio; 567 if (nmp->nm_wsize > MAXBSIZE) 568 nmp->nm_wsize = MAXBSIZE; 569 570 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 571 nmp->nm_rsize = argp->rsize; 572 /* Round down to multiple of blocksize */ 573 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 574 if (nmp->nm_rsize <= 0) 575 nmp->nm_rsize = NFS_FABLKSIZE; 576 } 577 if (nmp->nm_rsize > maxio) 578 nmp->nm_rsize = maxio; 579 if (nmp->nm_rsize > MAXBSIZE) 580 nmp->nm_rsize = MAXBSIZE; 581 582 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 583 nmp->nm_readdirsize = argp->readdirsize; 584 /* Round down to multiple of blocksize */ 585 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 586 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 587 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 588 } 589 if (nmp->nm_readdirsize > maxio) 590 nmp->nm_readdirsize = maxio; 591 592 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 593 argp->maxgrouplist <= NFS_MAXGRPS) 594 nmp->nm_numgrps = argp->maxgrouplist; 595 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 596 argp->readahead <= NFS_MAXRAHEAD) 597 nmp->nm_readahead = argp->readahead; 598 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 599 argp->leaseterm <= NQ_MAXLEASE) 600 nmp->nm_leaseterm = argp->leaseterm; 601 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 602 argp->deadthresh <= NQ_NEVERDEAD) 603 nmp->nm_deadthresh = argp->deadthresh; 604 /* Set up the sockets and per-host congestion */ 605 nmp->nm_sotype = argp->sotype; 606 nmp->nm_soproto = argp->proto; 607 608 /* 609 * For Connection based sockets (TCP,...) defer the connect until 610 * the first request, in case the server is not responding. 611 */ 612 if (nmp->nm_sotype == SOCK_DGRAM && 613 (error = nfs_connect(nmp, (struct nfsreq *)0))) 614 goto bad; 615 616 /* 617 * This is silly, but it has to be set so that vinifod() works. 618 * We do not want to do an nfs_statfs() here since we can get 619 * stuck on a dead server and we are holding a lock on the mount 620 * point. 621 */ 622 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 623 /* 624 * A reference count is needed on the nfsnode representing the 625 * remote root. If this object is not persistent, then backward 626 * traversals of the mount point (i.e. "..") will not work if 627 * the nfsnode gets flushed out of the cache. Ufs does not have 628 * this problem, because one can identify root inodes by their 629 * number == ROOTINO (2). 630 */ 631 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 632 if (error) 633 goto bad; 634 *vpp = NFSTOV(np); 635 636 return (0); 637 bad: 638 nfs_disconnect(nmp); 639 free((caddr_t)nmp, M_NFSMNT); 640 m_freem(nam); 641 return (error); 642 } 643 644 /* 645 * unmount system call 646 */ 647 int 648 nfs_unmount(mp, mntflags, p) 649 struct mount *mp; 650 int mntflags; 651 struct proc *p; 652 { 653 register struct nfsmount *nmp; 654 struct nfsnode *np; 655 struct vnode *vp; 656 int error, flags = 0; 657 658 if (mntflags & MNT_FORCE) 659 flags |= FORCECLOSE; 660 nmp = VFSTONFS(mp); 661 /* 662 * Goes something like this.. 663 * - Check for activity on the root vnode (other than ourselves). 664 * - Call vflush() to clear out vnodes for this file system, 665 * except for the root vnode. 666 * - Decrement reference on the vnode representing remote root. 667 * - Close the socket 668 * - Free up the data structures 669 */ 670 /* 671 * We need to decrement the ref. count on the nfsnode representing 672 * the remote root. See comment in mountnfs(). The VFS unmount() 673 * has done vput on this vnode, otherwise we would get deadlock! 674 */ 675 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 676 if (error) 677 return(error); 678 vp = NFSTOV(np); 679 if (vp->v_usecount > 2) { 680 vput(vp); 681 return (EBUSY); 682 } 683 684 /* 685 * Must handshake with nqnfs_clientd() if it is active. 686 */ 687 nmp->nm_flag |= NFSMNT_DISMINPROG; 688 while (nmp->nm_inprog != NULLVP) 689 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 690 error = vflush(mp, vp, flags); 691 if (error) { 692 vput(vp); 693 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 694 return (error); 695 } 696 697 /* 698 * We are now committed to the unmount. 699 * For NQNFS, let the server daemon free the nfsmount structure. 700 */ 701 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 702 nmp->nm_flag |= NFSMNT_DISMNT; 703 704 /* 705 * There are two reference counts to get rid of here. 706 */ 707 vrele(vp); 708 vrele(vp); 709 vgone(vp); 710 nfs_disconnect(nmp); 711 m_freem(nmp->nm_nam); 712 713 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 714 free((caddr_t)nmp, M_NFSMNT); 715 return (0); 716 } 717 718 /* 719 * Return root of a filesystem 720 */ 721 int 722 nfs_root(mp, vpp) 723 struct mount *mp; 724 struct vnode **vpp; 725 { 726 register struct vnode *vp; 727 struct nfsmount *nmp; 728 struct nfsnode *np; 729 int error; 730 731 nmp = VFSTONFS(mp); 732 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 733 if (error) 734 return (error); 735 vp = NFSTOV(np); 736 vp->v_type = VDIR; 737 vp->v_flag = VROOT; 738 *vpp = vp; 739 return (0); 740 } 741 742 extern int syncprt; 743 744 /* 745 * Flush out the buffer cache 746 */ 747 /* ARGSUSED */ 748 int 749 nfs_sync(mp, waitfor, cred, p) 750 struct mount *mp; 751 int waitfor; 752 struct ucred *cred; 753 struct proc *p; 754 { 755 register struct vnode *vp; 756 int error, allerror = 0; 757 758 /* 759 * Force stale buffer cache information to be flushed. 760 */ 761 loop: 762 for (vp = mp->mnt_vnodelist.lh_first; 763 vp != NULL; 764 vp = vp->v_mntvnodes.le_next) { 765 /* 766 * If the vnode that we are about to sync is no longer 767 * associated with this mount point, start over. 768 */ 769 if (vp->v_mount != mp) 770 goto loop; 771 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 772 continue; 773 if (vget(vp, 1)) 774 goto loop; 775 error = VOP_FSYNC(vp, cred, waitfor, p); 776 if (error) 777 allerror = error; 778 vput(vp); 779 } 780 return (allerror); 781 } 782 783 /* 784 * NFS flat namespace lookup. 785 * Currently unsupported. 786 */ 787 /* ARGSUSED */ 788 int 789 nfs_vget(mp, ino, vpp) 790 struct mount *mp; 791 ino_t ino; 792 struct vnode **vpp; 793 { 794 795 return (EOPNOTSUPP); 796 } 797 798 /* 799 * At this point, this should never happen 800 */ 801 /* ARGSUSED */ 802 int 803 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 804 register struct mount *mp; 805 struct fid *fhp; 806 struct mbuf *nam; 807 struct vnode **vpp; 808 int *exflagsp; 809 struct ucred **credanonp; 810 { 811 812 return (EINVAL); 813 } 814 815 /* 816 * Vnode pointer to File handle, should never happen either 817 */ 818 /* ARGSUSED */ 819 int 820 nfs_vptofh(vp, fhp) 821 struct vnode *vp; 822 struct fid *fhp; 823 { 824 825 return (EINVAL); 826 } 827 828 /* 829 * Vfs start routine, a no-op. 830 */ 831 /* ARGSUSED */ 832 int 833 nfs_start(mp, flags, p) 834 struct mount *mp; 835 int flags; 836 struct proc *p; 837 { 838 839 return (0); 840 } 841 842 /* 843 * Do operations associated with quotas, not supported 844 */ 845 /* ARGSUSED */ 846 int 847 nfs_quotactl(mp, cmd, uid, arg, p) 848 struct mount *mp; 849 int cmd; 850 uid_t uid; 851 caddr_t arg; 852 struct proc *p; 853 { 854 855 return (EOPNOTSUPP); 856 } 857 858 /* 859 * Do that sysctl thang... 860 */ 861 static int 862 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 863 size_t newlen, struct proc *p) 864 { 865 int rv; 866 867 /* 868 * All names at this level are terminal. 869 */ 870 if(namelen > 1) 871 return ENOTDIR; /* overloaded */ 872 873 switch(name[0]) { 874 case NFS_NFSSTATS: 875 if(!oldp) { 876 *oldlenp = sizeof nfsstats; 877 return 0; 878 } 879 880 if(*oldlenp < sizeof nfsstats) { 881 *oldlenp = sizeof nfsstats; 882 return ENOMEM; 883 } 884 885 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 886 if(rv) return rv; 887 888 if(newp && newlen != sizeof nfsstats) 889 return EINVAL; 890 891 if(newp) { 892 return copyin(newp, &nfsstats, sizeof nfsstats); 893 } 894 return 0; 895 896 default: 897 return EOPNOTSUPP; 898 } 899 } 900 901