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 8.5 (Berkeley) 03/30/95 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 struct mount *nfs_mountdiskless __P((char *, char *, int, 78 struct sockaddr_in *, struct nfs_args *, register struct vnode **)); 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 register struct mount *mp; 229 register 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 panic("nfs_mountroot: socreate(%04x): %d", 267 nd->myif.ifra_addr.sa_family, error); 268 269 /* 270 * We might not have been told the right interface, so we pass 271 * over the first ten interfaces of the same kind, until we get 272 * one of them configured. 273 */ 274 275 for (i = strlen(nd->myif.ifra_name) - 1; 276 nd->myif.ifra_name[i] >= '0' && 277 nd->myif.ifra_name[i] <= '9'; 278 nd->myif.ifra_name[i] ++) { 279 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, p); 280 if(!error) 281 break; 282 } 283 if (error) 284 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 285 soclose(so); 286 287 /* 288 * If the gateway field is filled in, set it as the default route. 289 */ 290 if (nd->mygateway.sin_len != 0) { 291 struct sockaddr_in mask, sin; 292 293 bzero((caddr_t)&mask, sizeof(mask)); 294 sin = mask; 295 sin.sin_family = AF_INET; 296 sin.sin_len = sizeof(sin); 297 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin, 298 (struct sockaddr *)&nd->mygateway, 299 (struct sockaddr *)&mask, 300 RTF_UP | RTF_GATEWAY, (struct rtentry **)0); 301 if (error) 302 panic("nfs_mountroot: RTM_ADD: %d", error); 303 } 304 305 if (nd->swap_nblks) { 306 /* 307 * Create a fake mount point just for the swap vnode so that the 308 * swap file can be on a different server from the rootfs. 309 */ 310 nd->swap_args.fh = nd->swap_fh; 311 /* 312 * If using nfsv3_diskless, replace NFSX_V2FH with 313 * nd->swap_fhsize. 314 */ 315 nd->swap_args.fhsize = NFSX_V2FH; 316 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 317 sprintf(buf,"%ld.%ld.%ld.%ld:%s", 318 (l >> 24) & 0xff, (l >> 16) & 0xff, 319 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 320 printf("NFS SWAP: %s\n",buf); 321 (void) nfs_mountdiskless(buf, "/swap", 0, 322 &nd->swap_saddr, &nd->swap_args, &vp); 323 324 for (i=0;swdevt[i].sw_dev != NODEV;i++) ; 325 326 /* 327 * Since the swap file is not the root dir of a file system, 328 * hack it to a regular file. 329 */ 330 vp->v_type = VREG; 331 vp->v_flag = 0; 332 swapdev_vp = vp; 333 VREF(vp); 334 swdevt[i].sw_vp = vp; 335 swdevt[i].sw_nblks = nd->swap_nblks*2; 336 337 if (!swdevt[i].sw_nblks) { 338 swdevt[i].sw_nblks = 2048; 339 printf("defaulting to %d kbyte.\n", 340 swdevt[i].sw_nblks/2); 341 } else 342 printf("using %d kbyte.\n",swdevt[i].sw_nblks/2); 343 } 344 345 /* 346 * Create the rootfs mount point. 347 */ 348 nd->root_args.fh = nd->root_fh; 349 /* 350 * If using nfsv3_diskless, replace NFSX_V2FH with nd->root_fhsize. 351 */ 352 nd->root_args.fhsize = NFSX_V2FH; 353 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 354 sprintf(buf,"%ld.%ld.%ld.%ld:%s", 355 (l >> 24) & 0xff, (l >> 16) & 0xff, 356 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 357 printf("NFS ROOT: %s\n",buf); 358 mp = nfs_mountdiskless(buf, "/", MNT_RDONLY, 359 &nd->root_saddr, &nd->root_args, &vp); 360 361 if (vfs_lock(mp)) 362 panic("nfs_mountroot: vfs_lock"); 363 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 364 mp->mnt_flag |= MNT_ROOTFS; 365 mp->mnt_vnodecovered = NULLVP; 366 vfs_unlock(mp); 367 rootvp = vp; 368 369 /* 370 * This is not really an nfs issue, but it is much easier to 371 * set hostname here and then let the "/etc/rc.xxx" files 372 * mount the right /var based upon its preset value. 373 */ 374 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 375 hostname[MAXHOSTNAMELEN - 1] = '\0'; 376 for (i = 0; i < MAXHOSTNAMELEN; i++) 377 if (hostname[i] == '\0') 378 break; 379 hostnamelen = i; 380 inittodr(ntohl(nd->root_time)); 381 return (0); 382 } 383 384 /* 385 * Internal version of mount system call for diskless setup. 386 */ 387 static struct mount * 388 nfs_mountdiskless(path, which, mountflag, sin, args, vpp) 389 char *path; 390 char *which; 391 int mountflag; 392 struct sockaddr_in *sin; 393 struct nfs_args *args; 394 register struct vnode **vpp; 395 { 396 register struct mount *mp; 397 register struct mbuf *m; 398 register int error; 399 400 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 401 M_MOUNT, M_NOWAIT); 402 if (mp == NULL) 403 panic("nfs_mountroot: %s mount malloc", which); 404 bzero((char *)mp, (u_long)sizeof(struct mount)); 405 mp->mnt_op = &nfs_vfsops; 406 mp->mnt_flag = mountflag; 407 408 MGET(m, MT_SONAME, M_DONTWAIT); 409 if (m == NULL) 410 panic("nfs_mountroot: %s mount mbuf", which); 411 bcopy((caddr_t)sin, mtod(m, caddr_t), sin->sin_len); 412 m->m_len = sin->sin_len; 413 error = mountnfs(args, mp, m, which, path, vpp); 414 if (error) 415 panic("nfs_mountroot: mount %s on %s: %d", path, which, error); 416 417 return (mp); 418 } 419 420 421 /* 422 * VFS Operations. 423 * 424 * mount system call 425 * It seems a bit dumb to copyinstr() the host and path here and then 426 * bcopy() them in mountnfs(), but I wanted to detect errors before 427 * doing the sockargs() call because sockargs() allocates an mbuf and 428 * an error after that means that I have to release the mbuf. 429 */ 430 /* ARGSUSED */ 431 int 432 nfs_mount(mp, path, data, ndp, p) 433 struct mount *mp; 434 char *path; 435 caddr_t data; 436 struct nameidata *ndp; 437 struct proc *p; 438 { 439 int error; 440 struct nfs_args args; 441 struct mbuf *nam; 442 struct vnode *vp; 443 char pth[MNAMELEN], hst[MNAMELEN]; 444 u_int len; 445 u_char nfh[NFSX_V3FHMAX]; 446 447 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 448 if (error) 449 return (error); 450 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 451 if (error) 452 return (error); 453 error = copyinstr(path, pth, MNAMELEN-1, &len); 454 if (error) 455 return (error); 456 bzero(&pth[len], MNAMELEN - len); 457 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 458 if (error) 459 return (error); 460 bzero(&hst[len], MNAMELEN - len); 461 /* sockargs() call must be after above copyin() calls */ 462 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 463 if (error) 464 return (error); 465 args.fh = nfh; 466 error = mountnfs(&args, mp, nam, pth, hst, &vp); 467 return (error); 468 } 469 470 /* 471 * Common code for mount and mountroot 472 */ 473 int 474 mountnfs(argp, mp, nam, pth, hst, vpp) 475 register struct nfs_args *argp; 476 register struct mount *mp; 477 struct mbuf *nam; 478 char *pth, *hst; 479 struct vnode **vpp; 480 { 481 register struct nfsmount *nmp; 482 struct nfsnode *np; 483 int error, maxio; 484 485 if (mp->mnt_flag & MNT_UPDATE) { 486 nmp = VFSTONFS(mp); 487 /* update paths, file handles, etc, here XXX */ 488 m_freem(nam); 489 return (0); 490 } else { 491 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 492 M_NFSMNT, M_WAITOK); 493 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 494 TAILQ_INIT(&nmp->nm_uidlruhead); 495 mp->mnt_data = (qaddr_t)nmp; 496 } 497 vfs_getnewfsid(mp); 498 nmp->nm_mountp = mp; 499 nmp->nm_flag = argp->flags; 500 if (nmp->nm_flag & NFSMNT_NQNFS) 501 /* 502 * We have to set mnt_maxsymlink to a non-zero value so 503 * that COMPAT_43 routines will know that we are setting 504 * the d_type field in directories (and can zero it for 505 * unsuspecting binaries). 506 */ 507 mp->mnt_maxsymlinklen = 1; 508 nmp->nm_timeo = NFS_TIMEO; 509 nmp->nm_retry = NFS_RETRANS; 510 nmp->nm_wsize = NFS_WSIZE; 511 nmp->nm_rsize = NFS_RSIZE; 512 nmp->nm_readdirsize = NFS_READDIRSIZE; 513 nmp->nm_numgrps = NFS_MAXGRPS; 514 nmp->nm_readahead = NFS_DEFRAHEAD; 515 nmp->nm_leaseterm = NQ_DEFLEASE; 516 nmp->nm_deadthresh = NQ_DEADTHRESH; 517 CIRCLEQ_INIT(&nmp->nm_timerhead); 518 nmp->nm_inprog = NULLVP; 519 nmp->nm_fhsize = argp->fhsize; 520 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 521 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 522 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 523 nmp->nm_nam = nam; 524 525 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 526 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 527 if (nmp->nm_timeo < NFS_MINTIMEO) 528 nmp->nm_timeo = NFS_MINTIMEO; 529 else if (nmp->nm_timeo > NFS_MAXTIMEO) 530 nmp->nm_timeo = NFS_MAXTIMEO; 531 } 532 533 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 534 nmp->nm_retry = argp->retrans; 535 if (nmp->nm_retry > NFS_MAXREXMIT) 536 nmp->nm_retry = NFS_MAXREXMIT; 537 } 538 539 if (argp->flags & NFSMNT_NFSV3) { 540 if (argp->sotype == SOCK_DGRAM) 541 maxio = NFS_MAXDGRAMDATA; 542 else 543 maxio = NFS_MAXDATA; 544 } else 545 maxio = NFS_V2MAXDATA; 546 547 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 548 nmp->nm_wsize = argp->wsize; 549 /* Round down to multiple of blocksize */ 550 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 551 if (nmp->nm_wsize <= 0) 552 nmp->nm_wsize = NFS_FABLKSIZE; 553 } 554 if (nmp->nm_wsize > maxio) 555 nmp->nm_wsize = maxio; 556 if (nmp->nm_wsize > MAXBSIZE) 557 nmp->nm_wsize = MAXBSIZE; 558 559 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 560 nmp->nm_rsize = argp->rsize; 561 /* Round down to multiple of blocksize */ 562 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 563 if (nmp->nm_rsize <= 0) 564 nmp->nm_rsize = NFS_FABLKSIZE; 565 } 566 if (nmp->nm_rsize > maxio) 567 nmp->nm_rsize = maxio; 568 if (nmp->nm_rsize > MAXBSIZE) 569 nmp->nm_rsize = MAXBSIZE; 570 571 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 572 nmp->nm_readdirsize = argp->readdirsize; 573 /* Round down to multiple of blocksize */ 574 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 575 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 576 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 577 } 578 if (nmp->nm_readdirsize > maxio) 579 nmp->nm_readdirsize = maxio; 580 581 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 582 argp->maxgrouplist <= NFS_MAXGRPS) 583 nmp->nm_numgrps = argp->maxgrouplist; 584 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 585 argp->readahead <= NFS_MAXRAHEAD) 586 nmp->nm_readahead = argp->readahead; 587 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 588 argp->leaseterm <= NQ_MAXLEASE) 589 nmp->nm_leaseterm = argp->leaseterm; 590 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 591 argp->deadthresh <= NQ_NEVERDEAD) 592 nmp->nm_deadthresh = argp->deadthresh; 593 /* Set up the sockets and per-host congestion */ 594 nmp->nm_sotype = argp->sotype; 595 nmp->nm_soproto = argp->proto; 596 597 /* 598 * For Connection based sockets (TCP,...) defer the connect until 599 * the first request, in case the server is not responding. 600 */ 601 if (nmp->nm_sotype == SOCK_DGRAM && 602 (error = nfs_connect(nmp, (struct nfsreq *)0))) 603 goto bad; 604 605 /* 606 * This is silly, but it has to be set so that vinifod() works. 607 * We do not want to do an nfs_statfs() here since we can get 608 * stuck on a dead server and we are holding a lock on the mount 609 * point. 610 */ 611 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 612 /* 613 * A reference count is needed on the nfsnode representing the 614 * remote root. If this object is not persistent, then backward 615 * traversals of the mount point (i.e. "..") will not work if 616 * the nfsnode gets flushed out of the cache. Ufs does not have 617 * this problem, because one can identify root inodes by their 618 * number == ROOTINO (2). 619 */ 620 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 621 if (error) 622 goto bad; 623 *vpp = NFSTOV(np); 624 625 return (0); 626 bad: 627 nfs_disconnect(nmp); 628 free((caddr_t)nmp, M_NFSMNT); 629 m_freem(nam); 630 return (error); 631 } 632 633 /* 634 * unmount system call 635 */ 636 int 637 nfs_unmount(mp, mntflags, p) 638 struct mount *mp; 639 int mntflags; 640 struct proc *p; 641 { 642 register struct nfsmount *nmp; 643 struct nfsnode *np; 644 struct vnode *vp; 645 int error, flags = 0; 646 extern int doforce; 647 648 if (mntflags & MNT_FORCE) { 649 if (!doforce) 650 return (EINVAL); 651 flags |= FORCECLOSE; 652 } 653 nmp = VFSTONFS(mp); 654 /* 655 * Goes something like this.. 656 * - Check for activity on the root vnode (other than ourselves). 657 * - Call vflush() to clear out vnodes for this file system, 658 * except for the root vnode. 659 * - Decrement reference on the vnode representing remote root. 660 * - Close the socket 661 * - Free up the data structures 662 */ 663 /* 664 * We need to decrement the ref. count on the nfsnode representing 665 * the remote root. See comment in mountnfs(). The VFS unmount() 666 * has done vput on this vnode, otherwise we would get deadlock! 667 */ 668 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 669 if (error) 670 return(error); 671 vp = NFSTOV(np); 672 if (vp->v_usecount > 2) { 673 vput(vp); 674 return (EBUSY); 675 } 676 677 /* 678 * Must handshake with nqnfs_clientd() if it is active. 679 */ 680 nmp->nm_flag |= NFSMNT_DISMINPROG; 681 while (nmp->nm_inprog != NULLVP) 682 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 683 error = vflush(mp, vp, flags); 684 if (error) { 685 vput(vp); 686 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 687 return (error); 688 } 689 690 /* 691 * We are now committed to the unmount. 692 * For NQNFS, let the server daemon free the nfsmount structure. 693 */ 694 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 695 nmp->nm_flag |= NFSMNT_DISMNT; 696 697 /* 698 * There are two reference counts to get rid of here. 699 */ 700 vrele(vp); 701 vrele(vp); 702 vgone(vp); 703 nfs_disconnect(nmp); 704 m_freem(nmp->nm_nam); 705 706 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 707 free((caddr_t)nmp, M_NFSMNT); 708 return (0); 709 } 710 711 /* 712 * Return root of a filesystem 713 */ 714 int 715 nfs_root(mp, vpp) 716 struct mount *mp; 717 struct vnode **vpp; 718 { 719 register struct vnode *vp; 720 struct nfsmount *nmp; 721 struct nfsnode *np; 722 int error; 723 724 nmp = VFSTONFS(mp); 725 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 726 if (error) 727 return (error); 728 vp = NFSTOV(np); 729 vp->v_type = VDIR; 730 vp->v_flag = VROOT; 731 *vpp = vp; 732 return (0); 733 } 734 735 extern int syncprt; 736 737 /* 738 * Flush out the buffer cache 739 */ 740 /* ARGSUSED */ 741 int 742 nfs_sync(mp, waitfor, cred, p) 743 struct mount *mp; 744 int waitfor; 745 struct ucred *cred; 746 struct proc *p; 747 { 748 register struct vnode *vp; 749 int error, allerror = 0; 750 751 /* 752 * Force stale buffer cache information to be flushed. 753 */ 754 loop: 755 for (vp = mp->mnt_vnodelist.lh_first; 756 vp != NULL; 757 vp = vp->v_mntvnodes.le_next) { 758 /* 759 * If the vnode that we are about to sync is no longer 760 * associated with this mount point, start over. 761 */ 762 if (vp->v_mount != mp) 763 goto loop; 764 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 765 continue; 766 if (vget(vp, 1)) 767 goto loop; 768 error = VOP_FSYNC(vp, cred, waitfor, p); 769 if (error) 770 allerror = error; 771 vput(vp); 772 } 773 return (allerror); 774 } 775 776 /* 777 * NFS flat namespace lookup. 778 * Currently unsupported. 779 */ 780 /* ARGSUSED */ 781 int 782 nfs_vget(mp, ino, vpp) 783 struct mount *mp; 784 ino_t ino; 785 struct vnode **vpp; 786 { 787 788 return (EOPNOTSUPP); 789 } 790 791 /* 792 * At this point, this should never happen 793 */ 794 /* ARGSUSED */ 795 int 796 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 797 register struct mount *mp; 798 struct fid *fhp; 799 struct mbuf *nam; 800 struct vnode **vpp; 801 int *exflagsp; 802 struct ucred **credanonp; 803 { 804 805 return (EINVAL); 806 } 807 808 /* 809 * Vnode pointer to File handle, should never happen either 810 */ 811 /* ARGSUSED */ 812 int 813 nfs_vptofh(vp, fhp) 814 struct vnode *vp; 815 struct fid *fhp; 816 { 817 818 return (EINVAL); 819 } 820 821 /* 822 * Vfs start routine, a no-op. 823 */ 824 /* ARGSUSED */ 825 int 826 nfs_start(mp, flags, p) 827 struct mount *mp; 828 int flags; 829 struct proc *p; 830 { 831 832 return (0); 833 } 834 835 /* 836 * Do operations associated with quotas, not supported 837 */ 838 /* ARGSUSED */ 839 int 840 nfs_quotactl(mp, cmd, uid, arg, p) 841 struct mount *mp; 842 int cmd; 843 uid_t uid; 844 caddr_t arg; 845 struct proc *p; 846 { 847 848 return (EOPNOTSUPP); 849 } 850 851 /* 852 * Do that sysctl thang... 853 */ 854 static int 855 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 856 size_t newlen, struct proc *p) 857 { 858 int rv; 859 860 /* 861 * All names at this level are terminal. 862 */ 863 if(namelen > 1) 864 return ENOTDIR; /* overloaded */ 865 866 switch(name[0]) { 867 case NFS_NFSSTATS: 868 if(!oldp) { 869 *oldlenp = sizeof nfsstats; 870 return 0; 871 } 872 873 if(*oldlenp < sizeof nfsstats) { 874 *oldlenp = sizeof nfsstats; 875 return ENOMEM; 876 } 877 878 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 879 if(rv) return rv; 880 881 if(newp && newlen != sizeof nfsstats) 882 return EINVAL; 883 884 if(newp) { 885 return copyin(newp, &nfsstats, sizeof nfsstats); 886 } 887 return 0; 888 889 default: 890 return EOPNOTSUPP; 891 } 892 } 893 894