nfs_vfsops.c revision 1.44
1 /* $NetBSD: nfs_vfsops.c,v 1.44 1996/03/13 00:38:55 fvdl Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 39 */ 40 41 #include <sys/param.h> 42 #include <sys/conf.h> 43 #include <sys/ioctl.h> 44 #include <sys/signal.h> 45 #include <sys/proc.h> 46 #include <sys/namei.h> 47 #include <sys/vnode.h> 48 #include <sys/kernel.h> 49 #include <sys/mount.h> 50 #include <sys/buf.h> 51 #include <sys/mbuf.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/systm.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/nqnfs.h> 69 #include <nfs/nfs_var.h> 70 71 struct nfsstats nfsstats; 72 extern int nfs_ticks; 73 74 #ifdef notyet 75 static int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t, 76 struct proc *); 77 #endif 78 79 /* 80 * nfs vfs operations. 81 */ 82 struct vfsops nfs_vfsops = { 83 MOUNT_NFS, 84 nfs_mount, 85 nfs_start, 86 nfs_unmount, 87 nfs_root, 88 nfs_quotactl, 89 nfs_statfs, 90 nfs_sync, 91 nfs_vget, 92 nfs_fhtovp, 93 nfs_vptofh, 94 nfs_init, 95 #ifdef notyet 96 nfs_sysctl 97 #endif 98 }; 99 100 extern u_int32_t nfs_procids[NFS_NPROCS]; 101 extern u_int32_t nfs_prog, nfs_vers; 102 103 static struct mount * 104 nfs_mount_diskless __P((struct nfs_dlmount *, char *, int, struct vnode **)); 105 106 #define TRUE 1 107 #define FALSE 0 108 109 /* 110 * nfs statfs call 111 */ 112 int 113 nfs_statfs(mp, sbp, p) 114 struct mount *mp; 115 register struct statfs *sbp; 116 struct proc *p; 117 { 118 register struct vnode *vp; 119 register struct nfs_statfs *sfp; 120 register caddr_t cp; 121 register u_int32_t *tl; 122 register int32_t t1, t2; 123 caddr_t bpos, dpos, cp2; 124 struct nfsmount *nmp = VFSTONFS(mp); 125 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 126 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 127 struct ucred *cred; 128 struct nfsnode *np; 129 u_quad_t tquad; 130 131 #ifndef nolint 132 sfp = (struct nfs_statfs *)0; 133 #endif 134 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 135 if (error) 136 return (error); 137 vp = NFSTOV(np); 138 cred = crget(); 139 cred->cr_ngroups = 0; 140 if (v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0) 141 (void)nfs_fsinfo(nmp, vp, cred, p); 142 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 143 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 144 nfsm_fhtom(vp, v3); 145 nfsm_request(vp, NFSPROC_FSSTAT, p, cred); 146 if (v3) 147 nfsm_postop_attr(vp, retattr); 148 if (!error) 149 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 150 #ifdef COMPAT_09 151 sbp->f_type = 2; 152 #else 153 sbp->f_type = 0; 154 #endif 155 sbp->f_flags = nmp->nm_flag; 156 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 157 if (v3) { 158 sbp->f_bsize = NFS_FABLKSIZE; 159 fxdr_hyper(&sfp->sf_tbytes, &tquad); 160 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 161 fxdr_hyper(&sfp->sf_fbytes, &tquad); 162 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 163 fxdr_hyper(&sfp->sf_abytes, &tquad); 164 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 165 sbp->f_files = (fxdr_unsigned(int32_t, 166 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 167 sbp->f_ffree = (fxdr_unsigned(int32_t, 168 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 169 } else { 170 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 171 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 172 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 173 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 174 sbp->f_files = 0; 175 sbp->f_ffree = 0; 176 } 177 if (sbp != &mp->mnt_stat) { 178 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 179 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 180 } 181 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 182 nfsm_reqdone; 183 vrele(vp); 184 crfree(cred); 185 return (error); 186 } 187 188 /* 189 * nfs version 3 fsinfo rpc call 190 */ 191 int 192 nfs_fsinfo(nmp, vp, cred, p) 193 register struct nfsmount *nmp; 194 register struct vnode *vp; 195 struct ucred *cred; 196 struct proc *p; 197 { 198 register struct nfsv3_fsinfo *fsp; 199 register caddr_t cp; 200 register int32_t t1, t2; 201 register u_int32_t *tl, pref, max; 202 caddr_t bpos, dpos, cp2; 203 int error = 0, retattr; 204 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 205 206 nfsstats.rpccnt[NFSPROC_FSINFO]++; 207 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 208 nfsm_fhtom(vp, 1); 209 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 210 nfsm_postop_attr(vp, retattr); 211 if (!error) { 212 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 213 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 214 if (pref < nmp->nm_wsize) 215 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 216 ~(NFS_FABLKSIZE - 1); 217 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 218 if (max < nmp->nm_wsize) { 219 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 220 if (nmp->nm_wsize == 0) 221 nmp->nm_wsize = max; 222 } 223 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 224 if (pref < nmp->nm_rsize) 225 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 226 ~(NFS_FABLKSIZE - 1); 227 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 228 if (max < nmp->nm_rsize) { 229 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 230 if (nmp->nm_rsize == 0) 231 nmp->nm_rsize = max; 232 } 233 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 234 if (pref < nmp->nm_readdirsize) 235 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 236 ~(NFS_DIRBLKSIZ - 1); 237 if (max < nmp->nm_readdirsize) { 238 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 239 if (nmp->nm_readdirsize == 0) 240 nmp->nm_readdirsize = max; 241 } 242 nmp->nm_flag |= NFSMNT_GOTFSINFO; 243 } 244 nfsm_reqdone; 245 return (error); 246 } 247 248 /* 249 * Mount a remote root fs via. NFS. It goes like this: 250 * - Call nfs_boot_init() to fill in the nfs_diskless struct 251 * (using RARP, bootparam RPC, mountd RPC) 252 * - hand craft the swap nfs vnode hanging off a fake mount point 253 * if swdevt[0].sw_dev == NODEV 254 * - build the rootfs mount point and call mountnfs() to do the rest. 255 */ 256 int 257 nfs_mountroot() 258 { 259 struct nfs_diskless nd; 260 struct vattr attr; 261 struct mount *mp; 262 struct vnode *vp; 263 struct proc *procp; 264 long n; 265 int error; 266 267 procp = curproc; /* XXX */ 268 269 /* 270 * XXX time must be non-zero when we init the interface or else 271 * the arp code will wedge. [Fixed now in if_ether.c] 272 * However, the NFS attribute cache gives false "hits" when 273 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 274 */ 275 if (time.tv_sec < NFS_MAXATTRTIMO) 276 time.tv_sec = NFS_MAXATTRTIMO; 277 278 /* 279 * Call nfs_boot_init() to fill in the nfs_diskless struct. 280 * Side effect: Finds and configures a network interface. 281 */ 282 bzero((caddr_t) &nd, sizeof(nd)); 283 nfs_boot_init(&nd, procp); 284 285 /* 286 * Create the root mount point. 287 */ 288 nfs_boot_getfh(&nd.nd_boot, "root", &nd.nd_root); 289 mp = nfs_mount_diskless(&nd.nd_root, "/", 0, &vp); 290 printf("root on %s\n", nd.nd_root.ndm_host); 291 292 /* 293 * Link it into the mount list. 294 */ 295 #ifdef Lite2_integrated 296 simple_lock(&mountlist_slock); 297 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 298 simple_unlock(&mountlist_slock); 299 rootvp = vp; 300 vfs_unbusy(mp, procp); 301 #else 302 if (vfs_lock(mp)) 303 panic("nfs_mountroot: vfs_lock"); 304 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 305 mp->mnt_vnodecovered = NULLVP; 306 vfs_unlock(mp); 307 rootvp = vp; 308 #endif 309 310 /* Get root attributes (for the time). */ 311 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 312 if (error) panic("nfs_mountroot: getattr for root"); 313 n = attr.va_mtime.tv_sec; 314 #ifdef DEBUG 315 printf("root time: 0x%x\n", n); 316 #endif 317 inittodr(n); 318 319 /* 320 * XXX splnet, so networks will receive... 321 */ 322 splnet(); 323 324 #ifdef notyet 325 /* Set up swap credentials. */ 326 proc0.p_ucred->cr_uid = ntohl(nd.swap_ucred.cr_uid); 327 proc0.p_ucred->cr_gid = ntohl(nd.swap_ucred.cr_gid); 328 if ((proc0.p_ucred->cr_ngroups = ntohs(nd.swap_ucred.cr_ngroups)) > 329 NGROUPS) 330 proc0.p_ucred->cr_ngroups = NGROUPS; 331 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 332 proc0.p_ucred->cr_groups[i] = ntohl(nd.swap_ucred.cr_groups[i]); 333 #endif 334 335 /* 336 * "Mount" the swap device. 337 * 338 * On a "dataless" configuration (swap on disk) we will have: 339 * (swdevt[0].sw_dev != NODEV) identifying the swap device. 340 */ 341 if (bdevvp(swapdev, &swapdev_vp)) 342 panic("nfs_mountroot: can't setup swap vp"); 343 if (swdevt[0].sw_dev != NODEV) { 344 printf("swap on device 0x%x\n", swdevt[0].sw_dev); 345 return (0); 346 } 347 348 /* 349 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV) 350 * Create a fake mount point just for the swap vnode so that the 351 * swap file can be on a different server from the rootfs. 352 */ 353 nfs_boot_getfh(&nd.nd_boot, "swap", &nd.nd_swap); 354 mp = nfs_mount_diskless(&nd.nd_swap, "/swap", 0, &vp); 355 #ifdef Lite2_integrated 356 vfs_unbusy(mp, procp); 357 #endif 358 printf("swap on %s\n", nd.nd_swap.ndm_host); 359 360 /* 361 * Since the swap file is not the root dir of a file system, 362 * hack it to a regular file. 363 */ 364 vp->v_type = VREG; 365 vp->v_flag = 0; 366 swdevt[0].sw_vp = vp; 367 368 /* 369 * Find out how large the swap file is. 370 */ 371 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 372 if (error) 373 panic("nfs_mountroot: getattr for swap"); 374 n = (long) (attr.va_size >> DEV_BSHIFT); 375 #ifdef DEBUG 376 printf("swap size: 0x%x (blocks)\n", n); 377 #endif 378 swdevt[0].sw_nblks = n; 379 380 return (0); 381 } 382 383 /* 384 * Internal version of mount system call for diskless setup. 385 */ 386 static struct mount * 387 nfs_mount_diskless(ndmntp, mntname, mntflag, vpp) 388 struct nfs_dlmount *ndmntp; 389 char *mntname; 390 int mntflag; 391 struct vnode **vpp; 392 { 393 struct nfs_args args; 394 struct mount *mp; 395 struct mbuf *m; 396 int error; 397 398 #ifdef Lite2_integrated 399 vfs_rootmountalloc("nfs", mntname, &mp); 400 #else 401 /* Create the mount point. */ 402 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 403 M_MOUNT, M_WAITOK); 404 if (mp == NULL) 405 panic("nfs_mountroot: malloc mount for %s", mntname); 406 bzero((char *)mp, (u_long)sizeof(struct mount)); 407 #endif 408 mp->mnt_op = &nfs_vfsops; 409 mp->mnt_flag = mntflag; 410 411 /* Initialize mount args. */ 412 bzero((caddr_t) &args, sizeof(args)); 413 args.addr = (struct sockaddr *)&ndmntp->ndm_saddr; 414 args.addrlen = args.addr->sa_len; 415 args.sotype = SOCK_DGRAM; 416 args.fh = ndmntp->ndm_fh; 417 args.fhsize = NFSX_V2FH; 418 args.hostname = ndmntp->ndm_host; 419 args.flags = NFSMNT_RESVPORT; 420 421 #ifdef NFS_BOOT_OPTIONS 422 args.flags |= NFS_BOOT_OPTIONS; 423 #endif 424 #ifdef NFS_BOOT_RWSIZE 425 /* 426 * Reduce rsize,wsize for interfaces that consistently 427 * drop fragments of long UDP messages. (i.e. wd8003). 428 * You can always change these later via remount. 429 */ 430 args.flags |= NFSMNT_WSIZE | NFSMNT_RSIZE; 431 args.wsize = NFS_BOOT_RWSIZE; 432 args.rsize = NFS_BOOT_RWSIZE; 433 #endif 434 435 /* Get mbuf for server sockaddr. */ 436 m = m_get(M_WAIT, MT_SONAME); 437 if (m == NULL) 438 panic("nfs_mountroot: mget soname for %s", mntname); 439 bcopy((caddr_t)args.addr, mtod(m, caddr_t), 440 (m->m_len = args.addr->sa_len)); 441 442 error = mountnfs(&args, mp, m, mntname, args.hostname, vpp); 443 if (error) 444 panic("nfs_mountroot: mount %s failed: %d", mntname); 445 446 return (mp); 447 } 448 449 void 450 nfs_decode_args(nmp, argp) 451 struct nfsmount *nmp; 452 struct nfs_args *argp; 453 { 454 int s; 455 int adjsock; 456 int maxio; 457 458 s = splsoftnet(); 459 460 /* Re-bind if rsrvd port requested and wasn't on one */ 461 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 462 && (argp->flags & NFSMNT_RESVPORT); 463 464 /* Update flags atomically. Don't change the lock bits. */ 465 nmp->nm_flag = 466 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 467 splx(s); 468 469 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 470 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 471 if (nmp->nm_timeo < NFS_MINTIMEO) 472 nmp->nm_timeo = NFS_MINTIMEO; 473 else if (nmp->nm_timeo > NFS_MAXTIMEO) 474 nmp->nm_timeo = NFS_MAXTIMEO; 475 } 476 477 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 478 nmp->nm_retry = argp->retrans; 479 if (nmp->nm_retry > NFS_MAXREXMIT) 480 nmp->nm_retry = NFS_MAXREXMIT; 481 } 482 483 if (argp->flags & NFSMNT_NFSV3) { 484 if (argp->sotype == SOCK_DGRAM) 485 maxio = NFS_MAXDGRAMDATA; 486 else 487 maxio = NFS_MAXDATA; 488 } else 489 maxio = NFS_V2MAXDATA; 490 491 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 492 int osize = nmp->nm_wsize; 493 nmp->nm_wsize = argp->wsize; 494 /* Round down to multiple of blocksize */ 495 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 496 if (nmp->nm_wsize <= 0) 497 nmp->nm_wsize = NFS_FABLKSIZE; 498 adjsock |= (nmp->nm_wsize != osize); 499 } 500 if (nmp->nm_wsize > maxio) 501 nmp->nm_wsize = maxio; 502 if (nmp->nm_wsize > MAXBSIZE) 503 nmp->nm_wsize = MAXBSIZE; 504 505 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 506 int osize = nmp->nm_rsize; 507 nmp->nm_rsize = argp->rsize; 508 /* Round down to multiple of blocksize */ 509 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 510 if (nmp->nm_rsize <= 0) 511 nmp->nm_rsize = NFS_FABLKSIZE; 512 adjsock |= (nmp->nm_rsize != osize); 513 } 514 if (nmp->nm_rsize > maxio) 515 nmp->nm_rsize = maxio; 516 if (nmp->nm_rsize > MAXBSIZE) 517 nmp->nm_rsize = MAXBSIZE; 518 519 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 520 nmp->nm_readdirsize = argp->readdirsize; 521 /* Round down to multiple of blocksize */ 522 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 523 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 524 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 525 } else if (argp->flags & NFSMNT_RSIZE) 526 nmp->nm_readdirsize = nmp->nm_rsize; 527 528 if (nmp->nm_readdirsize > maxio) 529 nmp->nm_readdirsize = maxio; 530 531 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 532 argp->maxgrouplist <= NFS_MAXGRPS) 533 nmp->nm_numgrps = argp->maxgrouplist; 534 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 535 argp->readahead <= NFS_MAXRAHEAD) 536 nmp->nm_readahead = argp->readahead; 537 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 538 argp->leaseterm <= NQ_MAXLEASE) 539 nmp->nm_leaseterm = argp->leaseterm; 540 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 541 argp->deadthresh <= NQ_NEVERDEAD) 542 nmp->nm_deadthresh = argp->deadthresh; 543 544 if (nmp->nm_so && adjsock) { 545 nfs_disconnect(nmp); 546 if (nmp->nm_sotype == SOCK_DGRAM) 547 while (nfs_connect(nmp, (struct nfsreq *)0)) { 548 printf("nfs_args: retrying connect\n"); 549 (void) tsleep((caddr_t)&lbolt, 550 PSOCK, "nfscon", 0); 551 } 552 } 553 } 554 555 /* 556 * VFS Operations. 557 * 558 * mount system call 559 * It seems a bit dumb to copyinstr() the host and path here and then 560 * bcopy() them in mountnfs(), but I wanted to detect errors before 561 * doing the sockargs() call because sockargs() allocates an mbuf and 562 * an error after that means that I have to release the mbuf. 563 */ 564 /* ARGSUSED */ 565 int 566 nfs_mount(mp, path, data, ndp, p) 567 struct mount *mp; 568 char *path; 569 caddr_t data; 570 struct nameidata *ndp; 571 struct proc *p; 572 { 573 int error; 574 struct nfs_args args; 575 struct mbuf *nam; 576 struct vnode *vp; 577 char pth[MNAMELEN], hst[MNAMELEN]; 578 size_t len; 579 u_char nfh[NFSX_V3FHMAX]; 580 581 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 582 if (error) 583 return (error); 584 if (args.version != NFS_ARGSVERSION) 585 return (EPROGMISMATCH); 586 if (mp->mnt_flag & MNT_UPDATE) { 587 register struct nfsmount *nmp = VFSTONFS(mp); 588 589 if (nmp == NULL) 590 return (EIO); 591 nfs_decode_args(nmp, &args); 592 return (0); 593 } 594 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 595 if (error) 596 return (error); 597 error = copyinstr(path, pth, MNAMELEN-1, &len); 598 if (error) 599 return (error); 600 bzero(&pth[len], MNAMELEN - len); 601 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 602 if (error) 603 return (error); 604 bzero(&hst[len], MNAMELEN - len); 605 /* sockargs() call must be after above copyin() calls */ 606 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 607 if (error) 608 return (error); 609 args.fh = nfh; 610 error = mountnfs(&args, mp, nam, pth, hst, &vp); 611 return (error); 612 } 613 614 /* 615 * Common code for mount and mountroot 616 */ 617 int 618 mountnfs(argp, mp, nam, pth, hst, vpp) 619 register struct nfs_args *argp; 620 register struct mount *mp; 621 struct mbuf *nam; 622 char *pth, *hst; 623 struct vnode **vpp; 624 { 625 register struct nfsmount *nmp; 626 struct nfsnode *np; 627 int error; 628 629 if (mp->mnt_flag & MNT_UPDATE) { 630 nmp = VFSTONFS(mp); 631 /* update paths, file handles, etc, here XXX */ 632 m_freem(nam); 633 return (0); 634 } else { 635 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 636 M_NFSMNT, M_WAITOK); 637 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 638 mp->mnt_data = (qaddr_t)nmp; 639 TAILQ_INIT(&nmp->nm_uidlruhead); 640 } 641 #ifdef Lite2_integrated 642 vfs_getnewfsid(mp, makefstype(MOUNT_NFS)); 643 #else 644 getnewfsid(mp, makefstype(MOUNT_NFS)); 645 #endif 646 nmp->nm_mountp = mp; 647 if (argp->flags & NFSMNT_NQNFS) 648 /* 649 * We have to set mnt_maxsymlink to a non-zero value so 650 * that COMPAT_43 routines will know that we are setting 651 * the d_type field in directories (and can zero it for 652 * unsuspecting binaries). 653 */ 654 mp->mnt_maxsymlinklen = 1; 655 nmp->nm_timeo = NFS_TIMEO; 656 nmp->nm_retry = NFS_RETRANS; 657 nmp->nm_wsize = NFS_WSIZE; 658 nmp->nm_rsize = NFS_RSIZE; 659 nmp->nm_readdirsize = NFS_READDIRSIZE; 660 nmp->nm_numgrps = NFS_MAXGRPS; 661 nmp->nm_readahead = NFS_DEFRAHEAD; 662 nmp->nm_leaseterm = NQ_DEFLEASE; 663 nmp->nm_deadthresh = NQ_DEADTHRESH; 664 CIRCLEQ_INIT(&nmp->nm_timerhead); 665 nmp->nm_inprog = NULLVP; 666 nmp->nm_fhsize = argp->fhsize; 667 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 668 #ifdef COMPAT_09 669 mp->mnt_stat.f_type = 2; 670 #else 671 mp->mnt_stat.f_type = 0; 672 #endif 673 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 674 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 675 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 676 nmp->nm_nam = nam; 677 nfs_decode_args(nmp, argp); 678 679 /* Set up the sockets and per-host congestion */ 680 nmp->nm_sotype = argp->sotype; 681 nmp->nm_soproto = argp->proto; 682 683 /* 684 * For Connection based sockets (TCP,...) defer the connect until 685 * the first request, in case the server is not responding. 686 */ 687 if (nmp->nm_sotype == SOCK_DGRAM && 688 (error = nfs_connect(nmp, (struct nfsreq *)0))) 689 goto bad; 690 691 /* 692 * This is silly, but it has to be set so that vinifod() works. 693 * We do not want to do an nfs_statfs() here since we can get 694 * stuck on a dead server and we are holding a lock on the mount 695 * point. 696 */ 697 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 698 /* 699 * A reference count is needed on the nfsnode representing the 700 * remote root. If this object is not persistent, then backward 701 * traversals of the mount point (i.e. "..") will not work if 702 * the nfsnode gets flushed out of the cache. Ufs does not have 703 * this problem, because one can identify root inodes by their 704 * number == ROOTINO (2). 705 */ 706 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 707 if (error) 708 goto bad; 709 *vpp = NFSTOV(np); 710 711 return (0); 712 bad: 713 nfs_disconnect(nmp); 714 free((caddr_t)nmp, M_NFSMNT); 715 m_freem(nam); 716 return (error); 717 } 718 719 /* 720 * unmount system call 721 */ 722 int 723 nfs_unmount(mp, mntflags, p) 724 struct mount *mp; 725 int mntflags; 726 struct proc *p; 727 { 728 register struct nfsmount *nmp; 729 struct nfsnode *np; 730 struct vnode *vp; 731 int error, flags = 0; 732 733 if (mntflags & MNT_FORCE) 734 flags |= FORCECLOSE; 735 nmp = VFSTONFS(mp); 736 /* 737 * Goes something like this.. 738 * - Check for activity on the root vnode (other than ourselves). 739 * - Call vflush() to clear out vnodes for this file system, 740 * except for the root vnode. 741 * - Decrement reference on the vnode representing remote root. 742 * - Close the socket 743 * - Free up the data structures 744 */ 745 /* 746 * We need to decrement the ref. count on the nfsnode representing 747 * the remote root. See comment in mountnfs(). The VFS unmount() 748 * has done vput on this vnode, otherwise we would get deadlock! 749 */ 750 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 751 if (error) 752 return(error); 753 vp = NFSTOV(np); 754 if (vp->v_usecount > 2) { 755 vput(vp); 756 return (EBUSY); 757 } 758 759 /* 760 * Must handshake with nqnfs_clientd() if it is active. 761 */ 762 nmp->nm_flag |= NFSMNT_DISMINPROG; 763 while (nmp->nm_inprog != NULLVP) 764 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 765 error = vflush(mp, vp, flags); 766 if (error) { 767 vput(vp); 768 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 769 return (error); 770 } 771 772 /* 773 * We are now committed to the unmount. 774 * For NQNFS, let the server daemon free the nfsmount structure. 775 */ 776 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 777 nmp->nm_flag |= NFSMNT_DISMNT; 778 779 /* 780 * There are two reference counts to get rid of here. 781 */ 782 vrele(vp); 783 vrele(vp); 784 vgone(vp); 785 nfs_disconnect(nmp); 786 m_freem(nmp->nm_nam); 787 788 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 789 free((caddr_t)nmp, M_NFSMNT); 790 return (0); 791 } 792 793 /* 794 * Return root of a filesystem 795 */ 796 int 797 nfs_root(mp, vpp) 798 struct mount *mp; 799 struct vnode **vpp; 800 { 801 register struct vnode *vp; 802 struct nfsmount *nmp; 803 struct nfsnode *np; 804 int error; 805 806 nmp = VFSTONFS(mp); 807 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 808 if (error) 809 return (error); 810 vp = NFSTOV(np); 811 vp->v_type = VDIR; 812 vp->v_flag = VROOT; 813 *vpp = vp; 814 return (0); 815 } 816 817 extern int syncprt; 818 819 /* 820 * Flush out the buffer cache 821 */ 822 /* ARGSUSED */ 823 int 824 nfs_sync(mp, waitfor, cred, p) 825 struct mount *mp; 826 int waitfor; 827 struct ucred *cred; 828 struct proc *p; 829 { 830 register struct vnode *vp; 831 int error, allerror = 0; 832 833 /* 834 * Force stale buffer cache information to be flushed. 835 */ 836 loop: 837 for (vp = mp->mnt_vnodelist.lh_first; 838 vp != NULL; 839 vp = vp->v_mntvnodes.le_next) { 840 /* 841 * If the vnode that we are about to sync is no longer 842 * associated with this mount point, start over. 843 */ 844 if (vp->v_mount != mp) 845 goto loop; 846 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 847 continue; 848 #ifdef Lite2_integrated 849 if (vget(vp, LK_EXCLUSIVE, p)) 850 #else 851 if (vget(vp, 1)) 852 #endif 853 goto loop; 854 error = VOP_FSYNC(vp, cred, waitfor, p); 855 if (error) 856 allerror = error; 857 vput(vp); 858 } 859 return (allerror); 860 } 861 862 /* 863 * NFS flat namespace lookup. 864 * Currently unsupported. 865 */ 866 /* ARGSUSED */ 867 int 868 nfs_vget(mp, ino, vpp) 869 struct mount *mp; 870 ino_t ino; 871 struct vnode **vpp; 872 { 873 874 return (EOPNOTSUPP); 875 } 876 877 #ifdef notyet 878 /* 879 * Do that sysctl thang... 880 */ 881 static int 882 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 883 size_t newlen, struct proc *p) 884 { 885 int rv; 886 887 /* 888 * All names at this level are terminal. 889 */ 890 if(namelen > 1) 891 return ENOTDIR; /* overloaded */ 892 893 switch(name[0]) { 894 case NFS_NFSSTATS: 895 if(!oldp) { 896 *oldlenp = sizeof nfsstats; 897 return 0; 898 } 899 900 if(*oldlenp < sizeof nfsstats) { 901 *oldlenp = sizeof nfsstats; 902 return ENOMEM; 903 } 904 905 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 906 if(rv) return rv; 907 908 if(newp && newlen != sizeof nfsstats) 909 return EINVAL; 910 911 if(newp) { 912 return copyin(newp, &nfsstats, sizeof nfsstats); 913 } 914 return 0; 915 916 default: 917 return EOPNOTSUPP; 918 } 919 } 920 #endif 921 922 923 /* 924 * At this point, this should never happen 925 */ 926 /* ARGSUSED */ 927 int 928 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 929 register struct mount *mp; 930 struct fid *fhp; 931 struct mbuf *nam; 932 struct vnode **vpp; 933 int *exflagsp; 934 struct ucred **credanonp; 935 { 936 937 return (EINVAL); 938 } 939 940 /* 941 * Vnode pointer to File handle, should never happen either 942 */ 943 /* ARGSUSED */ 944 int 945 nfs_vptofh(vp, fhp) 946 struct vnode *vp; 947 struct fid *fhp; 948 { 949 950 return (EINVAL); 951 } 952 953 /* 954 * Vfs start routine, a no-op. 955 */ 956 /* ARGSUSED */ 957 int 958 nfs_start(mp, flags, p) 959 struct mount *mp; 960 int flags; 961 struct proc *p; 962 { 963 964 return (0); 965 } 966 967 /* 968 * Do operations associated with quotas, not supported 969 */ 970 /* ARGSUSED */ 971 int 972 nfs_quotactl(mp, cmd, uid, arg, p) 973 struct mount *mp; 974 int cmd; 975 uid_t uid; 976 caddr_t arg; 977 struct proc *p; 978 { 979 980 return (EOPNOTSUPP); 981 } 982
Indexes created Fri Sep 26 20:09:58 GMT 2025