nfs_vfsops.c revision 1.46
1 /* $NetBSD: nfs_vfsops.c,v 1.46 1996/03/24 23:58:10 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 = NULL, *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 if (mrep != NULL) 150 m_free(mrep); 151 goto nfsmout; 152 } 153 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 154 #ifdef COMPAT_09 155 sbp->f_type = 2; 156 #else 157 sbp->f_type = 0; 158 #endif 159 sbp->f_flags = nmp->nm_flag; 160 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 161 if (v3) { 162 sbp->f_bsize = NFS_FABLKSIZE; 163 fxdr_hyper(&sfp->sf_tbytes, &tquad); 164 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 165 fxdr_hyper(&sfp->sf_fbytes, &tquad); 166 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 167 fxdr_hyper(&sfp->sf_abytes, &tquad); 168 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 169 sbp->f_files = (fxdr_unsigned(int32_t, 170 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 171 sbp->f_ffree = (fxdr_unsigned(int32_t, 172 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 173 } else { 174 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 175 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 176 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 177 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 178 sbp->f_files = 0; 179 sbp->f_ffree = 0; 180 } 181 if (sbp != &mp->mnt_stat) { 182 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 183 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 184 } 185 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 186 nfsm_reqdone; 187 vrele(vp); 188 crfree(cred); 189 return (error); 190 } 191 192 /* 193 * nfs version 3 fsinfo rpc call 194 */ 195 int 196 nfs_fsinfo(nmp, vp, cred, p) 197 register struct nfsmount *nmp; 198 register struct vnode *vp; 199 struct ucred *cred; 200 struct proc *p; 201 { 202 register struct nfsv3_fsinfo *fsp; 203 register caddr_t cp; 204 register int32_t t1, t2; 205 register u_int32_t *tl, pref, max; 206 caddr_t bpos, dpos, cp2; 207 int error = 0, retattr; 208 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 209 210 nfsstats.rpccnt[NFSPROC_FSINFO]++; 211 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 212 nfsm_fhtom(vp, 1); 213 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 214 nfsm_postop_attr(vp, retattr); 215 if (!error) { 216 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 217 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 218 if (pref < nmp->nm_wsize) 219 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 220 ~(NFS_FABLKSIZE - 1); 221 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 222 if (max < nmp->nm_wsize) { 223 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 224 if (nmp->nm_wsize == 0) 225 nmp->nm_wsize = max; 226 } 227 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 228 if (pref < nmp->nm_rsize) 229 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 230 ~(NFS_FABLKSIZE - 1); 231 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 232 if (max < nmp->nm_rsize) { 233 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 234 if (nmp->nm_rsize == 0) 235 nmp->nm_rsize = max; 236 } 237 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 238 if (pref < nmp->nm_readdirsize) 239 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 240 ~(NFS_DIRBLKSIZ - 1); 241 if (max < nmp->nm_readdirsize) { 242 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 243 if (nmp->nm_readdirsize == 0) 244 nmp->nm_readdirsize = max; 245 } 246 nmp->nm_flag |= NFSMNT_GOTFSINFO; 247 } 248 nfsm_reqdone; 249 return (error); 250 } 251 252 /* 253 * Mount a remote root fs via. NFS. It goes like this: 254 * - Call nfs_boot_init() to fill in the nfs_diskless struct 255 * (using RARP, bootparam RPC, mountd RPC) 256 * - hand craft the swap nfs vnode hanging off a fake mount point 257 * if swdevt[0].sw_dev == NODEV 258 * - build the rootfs mount point and call mountnfs() to do the rest. 259 */ 260 int 261 nfs_mountroot() 262 { 263 struct nfs_diskless nd; 264 struct vattr attr; 265 struct mount *mp; 266 struct vnode *vp; 267 struct proc *procp; 268 long n; 269 int error; 270 271 procp = curproc; /* XXX */ 272 273 /* 274 * XXX time must be non-zero when we init the interface or else 275 * the arp code will wedge. [Fixed now in if_ether.c] 276 * However, the NFS attribute cache gives false "hits" when 277 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 278 */ 279 if (time.tv_sec < NFS_MAXATTRTIMO) 280 time.tv_sec = NFS_MAXATTRTIMO; 281 282 /* 283 * Call nfs_boot_init() to fill in the nfs_diskless struct. 284 * Side effect: Finds and configures a network interface. 285 */ 286 bzero((caddr_t) &nd, sizeof(nd)); 287 nfs_boot_init(&nd, procp); 288 289 /* 290 * Create the root mount point. 291 */ 292 nfs_boot_getfh(&nd.nd_boot, "root", &nd.nd_root); 293 mp = nfs_mount_diskless(&nd.nd_root, "/", 0, &vp); 294 printf("root on %s\n", nd.nd_root.ndm_host); 295 296 /* 297 * Link it into the mount list. 298 */ 299 #ifdef Lite2_integrated 300 simple_lock(&mountlist_slock); 301 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 302 simple_unlock(&mountlist_slock); 303 rootvp = vp; 304 vfs_unbusy(mp, procp); 305 #else 306 if (vfs_lock(mp)) 307 panic("nfs_mountroot: vfs_lock"); 308 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 309 mp->mnt_vnodecovered = NULLVP; 310 vfs_unlock(mp); 311 rootvp = vp; 312 #endif 313 314 /* Get root attributes (for the time). */ 315 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 316 if (error) panic("nfs_mountroot: getattr for root"); 317 n = attr.va_mtime.tv_sec; 318 #ifdef DEBUG 319 printf("root time: 0x%lx\n", n); 320 #endif 321 inittodr(n); 322 323 /* 324 * XXX splnet, so networks will receive... 325 */ 326 splnet(); 327 328 #ifdef notyet 329 /* Set up swap credentials. */ 330 proc0.p_ucred->cr_uid = ntohl(nd.swap_ucred.cr_uid); 331 proc0.p_ucred->cr_gid = ntohl(nd.swap_ucred.cr_gid); 332 if ((proc0.p_ucred->cr_ngroups = ntohs(nd.swap_ucred.cr_ngroups)) > 333 NGROUPS) 334 proc0.p_ucred->cr_ngroups = NGROUPS; 335 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 336 proc0.p_ucred->cr_groups[i] = ntohl(nd.swap_ucred.cr_groups[i]); 337 #endif 338 339 /* 340 * "Mount" the swap device. 341 * 342 * On a "dataless" configuration (swap on disk) we will have: 343 * (swdevt[0].sw_dev != NODEV) identifying the swap device. 344 */ 345 if (bdevvp(swapdev, &swapdev_vp)) 346 panic("nfs_mountroot: can't setup swap vp"); 347 if (swdevt[0].sw_dev != NODEV) { 348 printf("swap on device 0x%x\n", swdevt[0].sw_dev); 349 return (0); 350 } 351 352 /* 353 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV) 354 * Create a fake mount point just for the swap vnode so that the 355 * swap file can be on a different server from the rootfs. 356 */ 357 nfs_boot_getfh(&nd.nd_boot, "swap", &nd.nd_swap); 358 mp = nfs_mount_diskless(&nd.nd_swap, "/swap", 0, &vp); 359 #ifdef Lite2_integrated 360 vfs_unbusy(mp, procp); 361 #endif 362 printf("swap on %s\n", nd.nd_swap.ndm_host); 363 364 /* 365 * Since the swap file is not the root dir of a file system, 366 * hack it to a regular file. 367 */ 368 vp->v_type = VREG; 369 vp->v_flag = 0; 370 swdevt[0].sw_vp = vp; 371 372 /* 373 * Find out how large the swap file is. 374 */ 375 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 376 if (error) 377 panic("nfs_mountroot: getattr for swap"); 378 n = (long) (attr.va_size >> DEV_BSHIFT); 379 #ifdef DEBUG 380 printf("swap size: 0x%lx (blocks)\n", n); 381 #endif 382 swdevt[0].sw_nblks = n; 383 384 return (0); 385 } 386 387 /* 388 * Internal version of mount system call for diskless setup. 389 */ 390 static struct mount * 391 nfs_mount_diskless(ndmntp, mntname, mntflag, vpp) 392 struct nfs_dlmount *ndmntp; 393 char *mntname; 394 int mntflag; 395 struct vnode **vpp; 396 { 397 struct nfs_args args; 398 struct mount *mp; 399 struct mbuf *m; 400 int error; 401 402 #ifdef Lite2_integrated 403 vfs_rootmountalloc("nfs", mntname, &mp); 404 #else 405 /* Create the mount point. */ 406 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 407 M_MOUNT, M_WAITOK); 408 if (mp == NULL) 409 panic("nfs_mountroot: malloc mount for %s", mntname); 410 bzero((char *)mp, (u_long)sizeof(struct mount)); 411 #endif 412 mp->mnt_op = &nfs_vfsops; 413 mp->mnt_flag = mntflag; 414 415 /* Initialize mount args. */ 416 bzero((caddr_t) &args, sizeof(args)); 417 args.addr = (struct sockaddr *)&ndmntp->ndm_saddr; 418 args.addrlen = args.addr->sa_len; 419 args.sotype = SOCK_DGRAM; 420 args.fh = ndmntp->ndm_fh; 421 args.fhsize = NFSX_V2FH; 422 args.hostname = ndmntp->ndm_host; 423 args.flags = NFSMNT_RESVPORT; 424 425 #ifdef NFS_BOOT_OPTIONS 426 args.flags |= NFS_BOOT_OPTIONS; 427 #endif 428 #ifdef NFS_BOOT_RWSIZE 429 /* 430 * Reduce rsize,wsize for interfaces that consistently 431 * drop fragments of long UDP messages. (i.e. wd8003). 432 * You can always change these later via remount. 433 */ 434 args.flags |= NFSMNT_WSIZE | NFSMNT_RSIZE; 435 args.wsize = NFS_BOOT_RWSIZE; 436 args.rsize = NFS_BOOT_RWSIZE; 437 #endif 438 439 /* Get mbuf for server sockaddr. */ 440 m = m_get(M_WAIT, MT_SONAME); 441 if (m == NULL) 442 panic("nfs_mountroot: mget soname for %s", mntname); 443 bcopy((caddr_t)args.addr, mtod(m, caddr_t), 444 (m->m_len = args.addr->sa_len)); 445 446 error = mountnfs(&args, mp, m, mntname, args.hostname, vpp); 447 if (error) 448 panic("nfs_mountroot: mount %s failed: %d", mntname, error); 449 450 return (mp); 451 } 452 453 void 454 nfs_decode_args(nmp, argp) 455 struct nfsmount *nmp; 456 struct nfs_args *argp; 457 { 458 int s; 459 int adjsock; 460 int maxio; 461 462 s = splsoftnet(); 463 464 /* Re-bind if rsrvd port requested and wasn't on one */ 465 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 466 && (argp->flags & NFSMNT_RESVPORT); 467 468 /* Update flags atomically. Don't change the lock bits. */ 469 nmp->nm_flag = 470 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 471 splx(s); 472 473 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 474 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 475 if (nmp->nm_timeo < NFS_MINTIMEO) 476 nmp->nm_timeo = NFS_MINTIMEO; 477 else if (nmp->nm_timeo > NFS_MAXTIMEO) 478 nmp->nm_timeo = NFS_MAXTIMEO; 479 } 480 481 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 482 nmp->nm_retry = argp->retrans; 483 if (nmp->nm_retry > NFS_MAXREXMIT) 484 nmp->nm_retry = NFS_MAXREXMIT; 485 } 486 487 if (argp->flags & NFSMNT_NFSV3) { 488 if (argp->sotype == SOCK_DGRAM) 489 maxio = NFS_MAXDGRAMDATA; 490 else 491 maxio = NFS_MAXDATA; 492 } else 493 maxio = NFS_V2MAXDATA; 494 495 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 496 int osize = nmp->nm_wsize; 497 nmp->nm_wsize = argp->wsize; 498 /* Round down to multiple of blocksize */ 499 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 500 if (nmp->nm_wsize <= 0) 501 nmp->nm_wsize = NFS_FABLKSIZE; 502 adjsock |= (nmp->nm_wsize != osize); 503 } 504 if (nmp->nm_wsize > maxio) 505 nmp->nm_wsize = maxio; 506 if (nmp->nm_wsize > MAXBSIZE) 507 nmp->nm_wsize = MAXBSIZE; 508 509 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 510 int osize = nmp->nm_rsize; 511 nmp->nm_rsize = argp->rsize; 512 /* Round down to multiple of blocksize */ 513 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 514 if (nmp->nm_rsize <= 0) 515 nmp->nm_rsize = NFS_FABLKSIZE; 516 adjsock |= (nmp->nm_rsize != osize); 517 } 518 if (nmp->nm_rsize > maxio) 519 nmp->nm_rsize = maxio; 520 if (nmp->nm_rsize > MAXBSIZE) 521 nmp->nm_rsize = MAXBSIZE; 522 523 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 524 nmp->nm_readdirsize = argp->readdirsize; 525 /* Round down to multiple of blocksize */ 526 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 527 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 528 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 529 } else if (argp->flags & NFSMNT_RSIZE) 530 nmp->nm_readdirsize = nmp->nm_rsize; 531 532 if (nmp->nm_readdirsize > maxio) 533 nmp->nm_readdirsize = maxio; 534 535 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 536 argp->maxgrouplist <= NFS_MAXGRPS) 537 nmp->nm_numgrps = argp->maxgrouplist; 538 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 539 argp->readahead <= NFS_MAXRAHEAD) 540 nmp->nm_readahead = argp->readahead; 541 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 542 argp->leaseterm <= NQ_MAXLEASE) 543 nmp->nm_leaseterm = argp->leaseterm; 544 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 545 argp->deadthresh <= NQ_NEVERDEAD) 546 nmp->nm_deadthresh = argp->deadthresh; 547 548 if (nmp->nm_so && adjsock) { 549 nfs_disconnect(nmp); 550 if (nmp->nm_sotype == SOCK_DGRAM) 551 while (nfs_connect(nmp, (struct nfsreq *)0)) { 552 printf("nfs_args: retrying connect\n"); 553 (void) tsleep((caddr_t)&lbolt, 554 PSOCK, "nfscon", 0); 555 } 556 } 557 } 558 559 /* 560 * VFS Operations. 561 * 562 * mount system call 563 * It seems a bit dumb to copyinstr() the host and path here and then 564 * bcopy() them in mountnfs(), but I wanted to detect errors before 565 * doing the sockargs() call because sockargs() allocates an mbuf and 566 * an error after that means that I have to release the mbuf. 567 */ 568 /* ARGSUSED */ 569 int 570 nfs_mount(mp, path, data, ndp, p) 571 struct mount *mp; 572 char *path; 573 caddr_t data; 574 struct nameidata *ndp; 575 struct proc *p; 576 { 577 int error; 578 struct nfs_args args; 579 struct mbuf *nam; 580 struct vnode *vp; 581 char pth[MNAMELEN], hst[MNAMELEN]; 582 size_t len; 583 u_char nfh[NFSX_V3FHMAX]; 584 585 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 586 if (error) 587 return (error); 588 if (args.version != NFS_ARGSVERSION) 589 return (EPROGMISMATCH); 590 if (mp->mnt_flag & MNT_UPDATE) { 591 register struct nfsmount *nmp = VFSTONFS(mp); 592 593 if (nmp == NULL) 594 return (EIO); 595 nfs_decode_args(nmp, &args); 596 return (0); 597 } 598 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 599 if (error) 600 return (error); 601 error = copyinstr(path, pth, MNAMELEN-1, &len); 602 if (error) 603 return (error); 604 bzero(&pth[len], MNAMELEN - len); 605 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 606 if (error) 607 return (error); 608 bzero(&hst[len], MNAMELEN - len); 609 /* sockargs() call must be after above copyin() calls */ 610 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 611 if (error) 612 return (error); 613 args.fh = nfh; 614 error = mountnfs(&args, mp, nam, pth, hst, &vp); 615 return (error); 616 } 617 618 /* 619 * Common code for mount and mountroot 620 */ 621 int 622 mountnfs(argp, mp, nam, pth, hst, vpp) 623 register struct nfs_args *argp; 624 register struct mount *mp; 625 struct mbuf *nam; 626 char *pth, *hst; 627 struct vnode **vpp; 628 { 629 register struct nfsmount *nmp; 630 struct nfsnode *np; 631 int error; 632 633 if (mp->mnt_flag & MNT_UPDATE) { 634 nmp = VFSTONFS(mp); 635 /* update paths, file handles, etc, here XXX */ 636 m_freem(nam); 637 return (0); 638 } else { 639 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 640 M_NFSMNT, M_WAITOK); 641 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 642 mp->mnt_data = (qaddr_t)nmp; 643 TAILQ_INIT(&nmp->nm_uidlruhead); 644 } 645 #ifdef Lite2_integrated 646 vfs_getnewfsid(mp, makefstype(MOUNT_NFS)); 647 #else 648 getnewfsid(mp, makefstype(MOUNT_NFS)); 649 #endif 650 nmp->nm_mountp = mp; 651 if (argp->flags & NFSMNT_NQNFS) 652 /* 653 * We have to set mnt_maxsymlink to a non-zero value so 654 * that COMPAT_43 routines will know that we are setting 655 * the d_type field in directories (and can zero it for 656 * unsuspecting binaries). 657 */ 658 mp->mnt_maxsymlinklen = 1; 659 nmp->nm_timeo = NFS_TIMEO; 660 nmp->nm_retry = NFS_RETRANS; 661 nmp->nm_wsize = NFS_WSIZE; 662 nmp->nm_rsize = NFS_RSIZE; 663 nmp->nm_readdirsize = NFS_READDIRSIZE; 664 nmp->nm_numgrps = NFS_MAXGRPS; 665 nmp->nm_readahead = NFS_DEFRAHEAD; 666 nmp->nm_leaseterm = NQ_DEFLEASE; 667 nmp->nm_deadthresh = NQ_DEADTHRESH; 668 CIRCLEQ_INIT(&nmp->nm_timerhead); 669 nmp->nm_inprog = NULLVP; 670 nmp->nm_fhsize = argp->fhsize; 671 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 672 #ifdef COMPAT_09 673 mp->mnt_stat.f_type = 2; 674 #else 675 mp->mnt_stat.f_type = 0; 676 #endif 677 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 678 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 679 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 680 nmp->nm_nam = nam; 681 nfs_decode_args(nmp, argp); 682 683 /* Set up the sockets and per-host congestion */ 684 nmp->nm_sotype = argp->sotype; 685 nmp->nm_soproto = argp->proto; 686 687 /* 688 * For Connection based sockets (TCP,...) defer the connect until 689 * the first request, in case the server is not responding. 690 */ 691 if (nmp->nm_sotype == SOCK_DGRAM && 692 (error = nfs_connect(nmp, (struct nfsreq *)0))) 693 goto bad; 694 695 /* 696 * This is silly, but it has to be set so that vinifod() works. 697 * We do not want to do an nfs_statfs() here since we can get 698 * stuck on a dead server and we are holding a lock on the mount 699 * point. 700 */ 701 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 702 /* 703 * A reference count is needed on the nfsnode representing the 704 * remote root. If this object is not persistent, then backward 705 * traversals of the mount point (i.e. "..") will not work if 706 * the nfsnode gets flushed out of the cache. Ufs does not have 707 * this problem, because one can identify root inodes by their 708 * number == ROOTINO (2). 709 */ 710 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 711 if (error) 712 goto bad; 713 *vpp = NFSTOV(np); 714 715 return (0); 716 bad: 717 nfs_disconnect(nmp); 718 free((caddr_t)nmp, M_NFSMNT); 719 m_freem(nam); 720 return (error); 721 } 722 723 /* 724 * unmount system call 725 */ 726 int 727 nfs_unmount(mp, mntflags, p) 728 struct mount *mp; 729 int mntflags; 730 struct proc *p; 731 { 732 register struct nfsmount *nmp; 733 struct nfsnode *np; 734 struct vnode *vp; 735 int error, flags = 0; 736 737 if (mntflags & MNT_FORCE) 738 flags |= FORCECLOSE; 739 nmp = VFSTONFS(mp); 740 /* 741 * Goes something like this.. 742 * - Check for activity on the root vnode (other than ourselves). 743 * - Call vflush() to clear out vnodes for this file system, 744 * except for the root vnode. 745 * - Decrement reference on the vnode representing remote root. 746 * - Close the socket 747 * - Free up the data structures 748 */ 749 /* 750 * We need to decrement the ref. count on the nfsnode representing 751 * the remote root. See comment in mountnfs(). The VFS unmount() 752 * has done vput on this vnode, otherwise we would get deadlock! 753 */ 754 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 755 if (error) 756 return(error); 757 vp = NFSTOV(np); 758 if (vp->v_usecount > 2) { 759 vput(vp); 760 return (EBUSY); 761 } 762 763 /* 764 * Must handshake with nqnfs_clientd() if it is active. 765 */ 766 nmp->nm_flag |= NFSMNT_DISMINPROG; 767 while (nmp->nm_inprog != NULLVP) 768 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 769 error = vflush(mp, vp, flags); 770 if (error) { 771 vput(vp); 772 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 773 return (error); 774 } 775 776 /* 777 * We are now committed to the unmount. 778 * For NQNFS, let the server daemon free the nfsmount structure. 779 */ 780 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 781 nmp->nm_flag |= NFSMNT_DISMNT; 782 783 /* 784 * There are two reference counts to get rid of here. 785 */ 786 vrele(vp); 787 vrele(vp); 788 vgone(vp); 789 nfs_disconnect(nmp); 790 m_freem(nmp->nm_nam); 791 792 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 793 free((caddr_t)nmp, M_NFSMNT); 794 return (0); 795 } 796 797 /* 798 * Return root of a filesystem 799 */ 800 int 801 nfs_root(mp, vpp) 802 struct mount *mp; 803 struct vnode **vpp; 804 { 805 register struct vnode *vp; 806 struct nfsmount *nmp; 807 struct nfsnode *np; 808 int error; 809 810 nmp = VFSTONFS(mp); 811 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 812 if (error) 813 return (error); 814 vp = NFSTOV(np); 815 vp->v_type = VDIR; 816 vp->v_flag = VROOT; 817 *vpp = vp; 818 return (0); 819 } 820 821 extern int syncprt; 822 823 /* 824 * Flush out the buffer cache 825 */ 826 /* ARGSUSED */ 827 int 828 nfs_sync(mp, waitfor, cred, p) 829 struct mount *mp; 830 int waitfor; 831 struct ucred *cred; 832 struct proc *p; 833 { 834 register struct vnode *vp; 835 int error, allerror = 0; 836 837 /* 838 * Force stale buffer cache information to be flushed. 839 */ 840 loop: 841 for (vp = mp->mnt_vnodelist.lh_first; 842 vp != NULL; 843 vp = vp->v_mntvnodes.le_next) { 844 /* 845 * If the vnode that we are about to sync is no longer 846 * associated with this mount point, start over. 847 */ 848 if (vp->v_mount != mp) 849 goto loop; 850 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 851 continue; 852 #ifdef Lite2_integrated 853 if (vget(vp, LK_EXCLUSIVE, p)) 854 #else 855 if (vget(vp, 1)) 856 #endif 857 goto loop; 858 error = VOP_FSYNC(vp, cred, waitfor, p); 859 if (error) 860 allerror = error; 861 vput(vp); 862 } 863 return (allerror); 864 } 865 866 /* 867 * NFS flat namespace lookup. 868 * Currently unsupported. 869 */ 870 /* ARGSUSED */ 871 int 872 nfs_vget(mp, ino, vpp) 873 struct mount *mp; 874 ino_t ino; 875 struct vnode **vpp; 876 { 877 878 return (EOPNOTSUPP); 879 } 880 881 #ifdef notyet 882 /* 883 * Do that sysctl thang... 884 */ 885 static int 886 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 887 size_t newlen, struct proc *p) 888 { 889 int rv; 890 891 /* 892 * All names at this level are terminal. 893 */ 894 if(namelen > 1) 895 return ENOTDIR; /* overloaded */ 896 897 switch(name[0]) { 898 case NFS_NFSSTATS: 899 if(!oldp) { 900 *oldlenp = sizeof nfsstats; 901 return 0; 902 } 903 904 if(*oldlenp < sizeof nfsstats) { 905 *oldlenp = sizeof nfsstats; 906 return ENOMEM; 907 } 908 909 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 910 if(rv) return rv; 911 912 if(newp && newlen != sizeof nfsstats) 913 return EINVAL; 914 915 if(newp) { 916 return copyin(newp, &nfsstats, sizeof nfsstats); 917 } 918 return 0; 919 920 default: 921 return EOPNOTSUPP; 922 } 923 } 924 #endif 925 926 927 /* 928 * At this point, this should never happen 929 */ 930 /* ARGSUSED */ 931 int 932 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 933 register struct mount *mp; 934 struct fid *fhp; 935 struct mbuf *nam; 936 struct vnode **vpp; 937 int *exflagsp; 938 struct ucred **credanonp; 939 { 940 941 return (EINVAL); 942 } 943 944 /* 945 * Vnode pointer to File handle, should never happen either 946 */ 947 /* ARGSUSED */ 948 int 949 nfs_vptofh(vp, fhp) 950 struct vnode *vp; 951 struct fid *fhp; 952 { 953 954 return (EINVAL); 955 } 956 957 /* 958 * Vfs start routine, a no-op. 959 */ 960 /* ARGSUSED */ 961 int 962 nfs_start(mp, flags, p) 963 struct mount *mp; 964 int flags; 965 struct proc *p; 966 { 967 968 return (0); 969 } 970 971 /* 972 * Do operations associated with quotas, not supported 973 */ 974 /* ARGSUSED */ 975 int 976 nfs_quotactl(mp, cmd, uid, arg, p) 977 struct mount *mp; 978 int cmd; 979 uid_t uid; 980 caddr_t arg; 981 struct proc *p; 982 { 983 984 return (EOPNOTSUPP); 985 } 986
Indexes created Thu Sep 25 16:09:42 GMT 2025