nfs_vfsops.c revision 1.101.2.8
1 /* $NetBSD: nfs_vfsops.c,v 1.101.2.8 2002/06/24 22:12:11 nathanw 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/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.101.2.8 2002/06/24 22:12:11 nathanw Exp $"); 43 44 #if defined(_KERNEL_OPT) 45 #include "opt_compat_netbsd.h" 46 #include "opt_nfs.h" 47 #endif 48 49 #include <sys/param.h> 50 #include <sys/ioctl.h> 51 #include <sys/signal.h> 52 #include <sys/lwp.h> 53 #include <sys/proc.h> 54 #include <sys/namei.h> 55 #include <sys/device.h> 56 #include <sys/vnode.h> 57 #include <sys/kernel.h> 58 #include <sys/mount.h> 59 #include <sys/buf.h> 60 #include <sys/mbuf.h> 61 #include <sys/socket.h> 62 #include <sys/socketvar.h> 63 #include <sys/sysctl.h> 64 #include <sys/systm.h> 65 66 #include <net/if.h> 67 #include <net/route.h> 68 #include <netinet/in.h> 69 70 #include <nfs/rpcv2.h> 71 #include <nfs/nfsproto.h> 72 #include <nfs/nfsnode.h> 73 #include <nfs/nfs.h> 74 #include <nfs/nfsmount.h> 75 #include <nfs/xdr_subs.h> 76 #include <nfs/nfsm_subs.h> 77 #include <nfs/nfsdiskless.h> 78 #include <nfs/nqnfs.h> 79 #include <nfs/nfs_var.h> 80 81 extern struct nfsstats nfsstats; 82 extern int nfs_ticks; 83 84 int nfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 85 struct proc *)); 86 87 /* 88 * nfs vfs operations. 89 */ 90 91 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 92 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 93 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 94 95 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 96 &nfsv2_vnodeop_opv_desc, 97 &spec_nfsv2nodeop_opv_desc, 98 &fifo_nfsv2nodeop_opv_desc, 99 NULL, 100 }; 101 102 struct vfsops nfs_vfsops = { 103 MOUNT_NFS, 104 nfs_mount, 105 nfs_start, 106 nfs_unmount, 107 nfs_root, 108 nfs_quotactl, 109 nfs_statfs, 110 nfs_sync, 111 nfs_vget, 112 nfs_fhtovp, 113 nfs_vptofh, 114 nfs_vfs_init, 115 nfs_vfs_reinit, 116 nfs_vfs_done, 117 nfs_sysctl, 118 nfs_mountroot, 119 nfs_checkexp, 120 nfs_vnodeopv_descs, 121 }; 122 123 extern u_int32_t nfs_procids[NFS_NPROCS]; 124 extern u_int32_t nfs_prog, nfs_vers; 125 126 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 127 struct mount **, struct vnode **, struct proc *)); 128 129 #define TRUE 1 130 #define FALSE 0 131 132 /* 133 * nfs statfs call 134 */ 135 int 136 nfs_statfs(mp, sbp, p) 137 struct mount *mp; 138 struct statfs *sbp; 139 struct proc *p; 140 { 141 struct vnode *vp; 142 struct nfs_statfs *sfp; 143 caddr_t cp; 144 u_int32_t *tl; 145 int32_t t1, t2; 146 caddr_t bpos, dpos, cp2; 147 struct nfsmount *nmp = VFSTONFS(mp); 148 int error = 0, retattr; 149 #ifdef NFS_V2_ONLY 150 const int v3 = 0; 151 #else 152 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 153 #endif 154 struct mbuf *mreq, *mrep = NULL, *md, *mb, *mb2; 155 struct ucred *cred; 156 u_quad_t tquad; 157 158 #ifndef nolint 159 sfp = (struct nfs_statfs *)0; 160 #endif 161 vp = nmp->nm_vnode; 162 cred = crget(); 163 cred->cr_ngroups = 0; 164 #ifndef NFS_V2_ONLY 165 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 166 (void)nfs_fsinfo(nmp, vp, cred, p); 167 #endif 168 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 169 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 170 nfsm_fhtom(vp, v3); 171 nfsm_request(vp, NFSPROC_FSSTAT, p, cred); 172 if (v3) 173 nfsm_postop_attr(vp, retattr); 174 if (error) { 175 if (mrep != NULL) 176 m_free(mrep); 177 goto nfsmout; 178 } 179 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 180 #ifdef COMPAT_09 181 sbp->f_type = 2; 182 #else 183 sbp->f_type = 0; 184 #endif 185 sbp->f_flags = nmp->nm_flag; 186 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 187 if (v3) { 188 sbp->f_bsize = NFS_FABLKSIZE; 189 tquad = fxdr_hyper(&sfp->sf_tbytes); 190 sbp->f_blocks = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 191 tquad = fxdr_hyper(&sfp->sf_fbytes); 192 sbp->f_bfree = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 193 tquad = fxdr_hyper(&sfp->sf_abytes); 194 sbp->f_bavail = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 195 tquad = fxdr_hyper(&sfp->sf_tfiles); 196 sbp->f_files = (long)tquad; 197 tquad = fxdr_hyper(&sfp->sf_ffiles); 198 sbp->f_ffree = (long)tquad; 199 } else { 200 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 201 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 202 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 203 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 204 sbp->f_files = 0; 205 sbp->f_ffree = 0; 206 } 207 if (sbp != &mp->mnt_stat) { 208 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 209 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 210 } 211 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 212 nfsm_reqdone; 213 crfree(cred); 214 return (error); 215 } 216 217 #ifndef NFS_V2_ONLY 218 /* 219 * nfs version 3 fsinfo rpc call 220 */ 221 int 222 nfs_fsinfo(nmp, vp, cred, p) 223 struct nfsmount *nmp; 224 struct vnode *vp; 225 struct ucred *cred; 226 struct proc *p; 227 { 228 struct nfsv3_fsinfo *fsp; 229 caddr_t cp; 230 int32_t t1, t2; 231 u_int32_t *tl, pref, max; 232 caddr_t bpos, dpos, cp2; 233 int error = 0, retattr; 234 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 235 u_int64_t maxfsize; 236 237 nfsstats.rpccnt[NFSPROC_FSINFO]++; 238 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 239 nfsm_fhtom(vp, 1); 240 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 241 nfsm_postop_attr(vp, retattr); 242 if (!error) { 243 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 244 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 245 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 246 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 247 ~(NFS_FABLKSIZE - 1); 248 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 249 if (max < nmp->nm_wsize && max > 0) { 250 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 251 if (nmp->nm_wsize == 0) 252 nmp->nm_wsize = max; 253 } 254 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 255 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 256 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 257 ~(NFS_FABLKSIZE - 1); 258 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 259 if (max < nmp->nm_rsize && max > 0) { 260 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 261 if (nmp->nm_rsize == 0) 262 nmp->nm_rsize = max; 263 } 264 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 265 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 266 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 267 ~(NFS_DIRFRAGSIZ - 1); 268 if (max < nmp->nm_readdirsize && max > 0) { 269 nmp->nm_readdirsize = max & ~(NFS_DIRFRAGSIZ - 1); 270 if (nmp->nm_readdirsize == 0) 271 nmp->nm_readdirsize = max; 272 } 273 /* XXX */ 274 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 275 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 276 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 277 nmp->nm_maxfilesize = maxfsize; 278 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 279 } 280 nfsm_reqdone; 281 return (error); 282 } 283 #endif 284 285 /* 286 * Mount a remote root fs via. NFS. It goes like this: 287 * - Call nfs_boot_init() to fill in the nfs_diskless struct 288 * - build the rootfs mount point and call mountnfs() to do the rest. 289 */ 290 int 291 nfs_mountroot() 292 { 293 struct nfs_diskless *nd; 294 struct vattr attr; 295 struct mount *mp; 296 struct vnode *vp; 297 struct proc *procp; 298 long n; 299 int error; 300 301 procp = curproc; /* XXX */ 302 303 if (root_device->dv_class != DV_IFNET) 304 return (ENODEV); 305 306 /* 307 * XXX time must be non-zero when we init the interface or else 308 * the arp code will wedge. [Fixed now in if_ether.c] 309 * However, the NFS attribute cache gives false "hits" when 310 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 311 */ 312 if (time.tv_sec < NFS_MAXATTRTIMO) 313 time.tv_sec = NFS_MAXATTRTIMO; 314 315 /* 316 * Call nfs_boot_init() to fill in the nfs_diskless struct. 317 * Side effect: Finds and configures a network interface. 318 */ 319 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 320 memset((caddr_t)nd, 0, sizeof(*nd)); 321 error = nfs_boot_init(nd, procp); 322 if (error) { 323 free(nd, M_NFSMNT); 324 return (error); 325 } 326 327 /* 328 * Create the root mount point. 329 */ 330 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, procp); 331 if (error) 332 goto out; 333 printf("root on %s\n", nd->nd_root.ndm_host); 334 335 /* 336 * Link it into the mount list. 337 */ 338 simple_lock(&mountlist_slock); 339 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 340 simple_unlock(&mountlist_slock); 341 rootvp = vp; 342 mp->mnt_vnodecovered = NULLVP; 343 vfs_unbusy(mp); 344 345 /* Get root attributes (for the time). */ 346 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 347 if (error) 348 panic("nfs_mountroot: getattr for root"); 349 n = attr.va_atime.tv_sec; 350 #ifdef DEBUG 351 printf("root time: 0x%lx\n", n); 352 #endif 353 inittodr(n); 354 355 out: 356 if (error) 357 nfs_boot_cleanup(nd, procp); 358 free(nd, M_NFSMNT); 359 return (error); 360 } 361 362 /* 363 * Internal version of mount system call for diskless setup. 364 * Separate function because we used to call it twice. 365 * (once for root and once for swap) 366 */ 367 static int 368 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, p) 369 struct nfs_dlmount *ndmntp; 370 const char *mntname; /* mount point name */ 371 struct mount **mpp; 372 struct vnode **vpp; 373 struct proc *p; 374 { 375 struct mount *mp; 376 struct mbuf *m; 377 int error; 378 379 vfs_rootmountalloc(MOUNT_NFS, (char *)mntname, &mp); 380 381 mp->mnt_op = &nfs_vfsops; 382 383 /* 384 * Historical practice expects NFS root file systems to 385 * be initially mounted r/w. 386 */ 387 mp->mnt_flag &= ~MNT_RDONLY; 388 389 /* Get mbuf for server sockaddr. */ 390 m = m_get(M_WAIT, MT_SONAME); 391 if (m == NULL) 392 panic("nfs_mountroot: mget soname for %s", mntname); 393 memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr, 394 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 395 396 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 397 ndmntp->ndm_args.hostname, vpp, p); 398 if (error) { 399 mp->mnt_op->vfs_refcount--; 400 vfs_unbusy(mp); 401 printf("nfs_mountroot: mount %s failed: %d\n", 402 mntname, error); 403 free(mp, M_MOUNT); 404 } else 405 *mpp = mp; 406 407 return (error); 408 } 409 410 void 411 nfs_decode_args(nmp, argp) 412 struct nfsmount *nmp; 413 struct nfs_args *argp; 414 { 415 int s; 416 int adjsock; 417 int maxio; 418 419 s = splsoftnet(); 420 421 /* 422 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 423 * no sense in that context. 424 */ 425 if (argp->sotype == SOCK_STREAM) 426 argp->flags &= ~NFSMNT_NOCONN; 427 428 /* 429 * Cookie translation is not needed for v2, silently ignore it. 430 */ 431 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 432 NFSMNT_XLATECOOKIE) 433 argp->flags &= ~NFSMNT_XLATECOOKIE; 434 435 /* Re-bind if rsrvd port requested and wasn't on one */ 436 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 437 && (argp->flags & NFSMNT_RESVPORT); 438 /* Also re-bind if we're switching to/from a connected UDP socket */ 439 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 440 (argp->flags & NFSMNT_NOCONN)); 441 442 /* Update flags. */ 443 nmp->nm_flag = argp->flags; 444 splx(s); 445 446 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 447 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 448 if (nmp->nm_timeo < NFS_MINTIMEO) 449 nmp->nm_timeo = NFS_MINTIMEO; 450 else if (nmp->nm_timeo > NFS_MAXTIMEO) 451 nmp->nm_timeo = NFS_MAXTIMEO; 452 } 453 454 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 455 nmp->nm_retry = argp->retrans; 456 if (nmp->nm_retry > NFS_MAXREXMIT) 457 nmp->nm_retry = NFS_MAXREXMIT; 458 } 459 460 #ifndef NFS_V2_ONLY 461 if (argp->flags & NFSMNT_NFSV3) { 462 if (argp->sotype == SOCK_DGRAM) 463 maxio = NFS_MAXDGRAMDATA; 464 else 465 maxio = NFS_MAXDATA; 466 } else 467 #endif 468 maxio = NFS_V2MAXDATA; 469 470 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 471 int osize = nmp->nm_wsize; 472 nmp->nm_wsize = argp->wsize; 473 /* Round down to multiple of blocksize */ 474 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 475 if (nmp->nm_wsize <= 0) 476 nmp->nm_wsize = NFS_FABLKSIZE; 477 adjsock |= (nmp->nm_wsize != osize); 478 } 479 if (nmp->nm_wsize > maxio) 480 nmp->nm_wsize = maxio; 481 if (nmp->nm_wsize > MAXBSIZE) 482 nmp->nm_wsize = MAXBSIZE; 483 484 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 485 int osize = nmp->nm_rsize; 486 nmp->nm_rsize = argp->rsize; 487 /* Round down to multiple of blocksize */ 488 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 489 if (nmp->nm_rsize <= 0) 490 nmp->nm_rsize = NFS_FABLKSIZE; 491 adjsock |= (nmp->nm_rsize != osize); 492 } 493 if (nmp->nm_rsize > maxio) 494 nmp->nm_rsize = maxio; 495 if (nmp->nm_rsize > MAXBSIZE) 496 nmp->nm_rsize = MAXBSIZE; 497 498 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 499 nmp->nm_readdirsize = argp->readdirsize; 500 /* Round down to multiple of minimum blocksize */ 501 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 502 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 503 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 504 /* Bigger than buffer size makes no sense */ 505 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 506 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 507 } else if (argp->flags & NFSMNT_RSIZE) 508 nmp->nm_readdirsize = nmp->nm_rsize; 509 510 if (nmp->nm_readdirsize > maxio) 511 nmp->nm_readdirsize = maxio; 512 513 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 514 argp->maxgrouplist <= NFS_MAXGRPS) 515 nmp->nm_numgrps = argp->maxgrouplist; 516 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 517 argp->readahead <= NFS_MAXRAHEAD) 518 nmp->nm_readahead = argp->readahead; 519 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 520 argp->leaseterm <= NQ_MAXLEASE) 521 nmp->nm_leaseterm = argp->leaseterm; 522 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 523 argp->deadthresh <= NQ_NEVERDEAD) 524 nmp->nm_deadthresh = argp->deadthresh; 525 526 adjsock |= ((nmp->nm_sotype != argp->sotype) || 527 (nmp->nm_soproto != argp->proto)); 528 nmp->nm_sotype = argp->sotype; 529 nmp->nm_soproto = argp->proto; 530 531 if (nmp->nm_so && adjsock) { 532 nfs_safedisconnect(nmp); 533 if (nmp->nm_sotype == SOCK_DGRAM) 534 while (nfs_connect(nmp, (struct nfsreq *)0)) { 535 printf("nfs_args: retrying connect\n"); 536 (void) tsleep((caddr_t)&lbolt, 537 PSOCK, "nfscn3", 0); 538 } 539 } 540 } 541 542 /* 543 * VFS Operations. 544 * 545 * mount system call 546 * It seems a bit dumb to copyinstr() the host and path here and then 547 * memcpy() them in mountnfs(), but I wanted to detect errors before 548 * doing the sockargs() call because sockargs() allocates an mbuf and 549 * an error after that means that I have to release the mbuf. 550 */ 551 /* ARGSUSED */ 552 int 553 nfs_mount(mp, path, data, ndp, p) 554 struct mount *mp; 555 const char *path; 556 void *data; 557 struct nameidata *ndp; 558 struct proc *p; 559 { 560 int error; 561 struct nfs_args args; 562 struct mbuf *nam; 563 struct vnode *vp; 564 char pth[MNAMELEN], hst[MNAMELEN]; 565 size_t len; 566 u_char nfh[NFSX_V3FHMAX]; 567 568 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 569 if (error) 570 return (error); 571 if (args.version != NFS_ARGSVERSION) 572 return (EPROGMISMATCH); 573 #ifdef NFS_V2_ONLY 574 if (args.flags & NFSMNT_NQNFS) 575 return (EPROGUNAVAIL); 576 if (args.flags & NFSMNT_NFSV3) 577 return (EPROGMISMATCH); 578 #endif 579 if (mp->mnt_flag & MNT_UPDATE) { 580 struct nfsmount *nmp = VFSTONFS(mp); 581 582 if (nmp == NULL) 583 return (EIO); 584 /* 585 * When doing an update, we can't change from or to 586 * v3 and/or nqnfs, or change cookie translation 587 */ 588 args.flags = (args.flags & 589 ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) | 590 (nmp->nm_flag & 591 (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)); 592 nfs_decode_args(nmp, &args); 593 return (0); 594 } 595 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 596 return (EINVAL); 597 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 598 if (error) 599 return (error); 600 error = copyinstr(path, pth, MNAMELEN-1, &len); 601 if (error) 602 return (error); 603 memset(&pth[len], 0, MNAMELEN - len); 604 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 605 if (error) 606 return (error); 607 memset(&hst[len], 0, MNAMELEN - len); 608 /* sockargs() call must be after above copyin() calls */ 609 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 610 if (error) 611 return (error); 612 args.fh = nfh; 613 error = mountnfs(&args, mp, nam, pth, hst, &vp, p); 614 return (error); 615 } 616 617 /* 618 * Common code for mount and mountroot 619 */ 620 int 621 mountnfs(argp, mp, nam, pth, hst, vpp, p) 622 struct nfs_args *argp; 623 struct mount *mp; 624 struct mbuf *nam; 625 const char *pth, *hst; 626 struct vnode **vpp; 627 struct proc *p; 628 { 629 struct nfsmount *nmp; 630 struct nfsnode *np; 631 int error; 632 struct vattr attrs; 633 struct ucred *cr; 634 635 /* 636 * If the number of nfs iothreads to use has never 637 * been set, create a reasonable number of them. 638 */ 639 640 if (nfs_niothreads < 0) { 641 nfs_niothreads = NFS_DEFAULT_NIOTHREADS; 642 nfs_getset_niothreads(TRUE); 643 } 644 645 if (mp->mnt_flag & MNT_UPDATE) { 646 nmp = VFSTONFS(mp); 647 /* update paths, file handles, etc, here XXX */ 648 m_freem(nam); 649 return (0); 650 } else { 651 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 652 M_NFSMNT, M_WAITOK); 653 memset((caddr_t)nmp, 0, sizeof (struct nfsmount)); 654 mp->mnt_data = (qaddr_t)nmp; 655 TAILQ_INIT(&nmp->nm_uidlruhead); 656 TAILQ_INIT(&nmp->nm_bufq); 657 } 658 vfs_getnewfsid(mp); 659 nmp->nm_mountp = mp; 660 661 #ifndef NFS_V2_ONLY 662 if (argp->flags & NFSMNT_NQNFS) 663 /* 664 * We have to set mnt_maxsymlink to a non-zero value so 665 * that COMPAT_43 routines will know that we are setting 666 * the d_type field in directories (and can zero it for 667 * unsuspecting binaries). 668 */ 669 mp->mnt_maxsymlinklen = 1; 670 #endif 671 672 #ifndef NFS_V2_ONLY 673 if ((argp->flags & NFSMNT_NFSV3) == 0) 674 #endif 675 /* 676 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 677 * will fill this in. 678 */ 679 nmp->nm_maxfilesize = 0xffffffffLL; 680 681 nmp->nm_timeo = NFS_TIMEO; 682 nmp->nm_retry = NFS_RETRANS; 683 nmp->nm_wsize = NFS_WSIZE; 684 nmp->nm_rsize = NFS_RSIZE; 685 nmp->nm_readdirsize = NFS_READDIRSIZE; 686 nmp->nm_numgrps = NFS_MAXGRPS; 687 nmp->nm_readahead = NFS_DEFRAHEAD; 688 nmp->nm_leaseterm = NQ_DEFLEASE; 689 nmp->nm_deadthresh = NQ_DEADTHRESH; 690 CIRCLEQ_INIT(&nmp->nm_timerhead); 691 nmp->nm_inprog = NULLVP; 692 #ifdef COMPAT_09 693 mp->mnt_stat.f_type = 2; 694 #else 695 mp->mnt_stat.f_type = 0; 696 #endif 697 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, 698 MFSNAMELEN); 699 memcpy(mp->mnt_stat.f_mntfromname, hst, MNAMELEN); 700 memcpy(mp->mnt_stat.f_mntonname, pth, MNAMELEN); 701 nmp->nm_nam = nam; 702 703 /* Set up the sockets and per-host congestion */ 704 nmp->nm_sotype = argp->sotype; 705 nmp->nm_soproto = argp->proto; 706 707 nfs_decode_args(nmp, argp); 708 709 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 710 mp->mnt_dev_bshift = DEV_BSHIFT; 711 712 /* 713 * For Connection based sockets (TCP,...) defer the connect until 714 * the first request, in case the server is not responding. 715 */ 716 if (nmp->nm_sotype == SOCK_DGRAM && 717 (error = nfs_connect(nmp, (struct nfsreq *)0))) 718 goto bad; 719 720 /* 721 * This is silly, but it has to be set so that vinifod() works. 722 * We do not want to do an nfs_statfs() here since we can get 723 * stuck on a dead server and we are holding a lock on the mount 724 * point. 725 */ 726 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 727 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 728 if (error) 729 goto bad; 730 *vpp = NFSTOV(np); 731 VOP_GETATTR(*vpp, &attrs, p->p_ucred, p); 732 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 733 cr = crget(); 734 cr->cr_uid = attrs.va_uid; 735 cr->cr_gid = attrs.va_gid; 736 cr->cr_ngroups = 0; 737 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, p, cr); 738 crfree(cr); 739 } 740 741 /* 742 * A reference count is needed on the nfsnode representing the 743 * remote root. If this object is not persistent, then backward 744 * traversals of the mount point (i.e. "..") will not work if 745 * the nfsnode gets flushed out of the cache. Ufs does not have 746 * this problem, because one can identify root inodes by their 747 * number == ROOTINO (2). So, just unlock, but no rele. 748 */ 749 750 nmp->nm_vnode = *vpp; 751 VOP_UNLOCK(*vpp, 0); 752 753 return (0); 754 bad: 755 nfs_disconnect(nmp); 756 free((caddr_t)nmp, M_NFSMNT); 757 m_freem(nam); 758 return (error); 759 } 760 761 /* 762 * unmount system call 763 */ 764 int 765 nfs_unmount(mp, mntflags, p) 766 struct mount *mp; 767 int mntflags; 768 struct proc *p; 769 { 770 struct nfsmount *nmp; 771 struct vnode *vp; 772 int error, flags = 0; 773 774 if (mntflags & MNT_FORCE) 775 flags |= FORCECLOSE; 776 nmp = VFSTONFS(mp); 777 /* 778 * Goes something like this.. 779 * - Check for activity on the root vnode (other than ourselves). 780 * - Call vflush() to clear out vnodes for this file system, 781 * except for the root vnode. 782 * - Decrement reference on the vnode representing remote root. 783 * - Close the socket 784 * - Free up the data structures 785 */ 786 /* 787 * We need to decrement the ref. count on the nfsnode representing 788 * the remote root. See comment in mountnfs(). The VFS unmount() 789 * has done vput on this vnode, otherwise we would get deadlock! 790 */ 791 vp = nmp->nm_vnode; 792 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 793 if (error != 0) 794 return error; 795 796 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 797 vput(vp); 798 return (EBUSY); 799 } 800 801 /* 802 * Must handshake with nqnfs_clientd() if it is active. 803 */ 804 nmp->nm_iflag |= NFSMNT_DISMINPROG; 805 while (nmp->nm_inprog != NULLVP) 806 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 807 error = vflush(mp, vp, flags); 808 if (error) { 809 vput(vp); 810 nmp->nm_iflag &= ~NFSMNT_DISMINPROG; 811 return (error); 812 } 813 814 /* 815 * We are now committed to the unmount; mark the mount structure 816 * as doomed so that any sleepers kicked awake by nfs_disconnect 817 * will go away cleanly. 818 */ 819 nmp->nm_iflag |= NFSMNT_DISMNT; 820 821 /* 822 * There are two reference counts to get rid of here 823 * (see comment in mountnfs()). 824 */ 825 vrele(vp); 826 vput(vp); 827 vgone(vp); 828 nfs_disconnect(nmp); 829 m_freem(nmp->nm_nam); 830 831 /* 832 * For NQNFS, let the server daemon free the nfsmount structure. 833 */ 834 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 835 free((caddr_t)nmp, M_NFSMNT); 836 return (0); 837 } 838 839 /* 840 * Return root of a filesystem 841 */ 842 int 843 nfs_root(mp, vpp) 844 struct mount *mp; 845 struct vnode **vpp; 846 { 847 struct vnode *vp; 848 struct nfsmount *nmp; 849 int error; 850 851 nmp = VFSTONFS(mp); 852 vp = nmp->nm_vnode; 853 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 854 if (error != 0) 855 return error; 856 if (vp->v_type == VNON) 857 vp->v_type = VDIR; 858 vp->v_flag = VROOT; 859 *vpp = vp; 860 return (0); 861 } 862 863 extern int syncprt; 864 865 /* 866 * Flush out the buffer cache 867 */ 868 /* ARGSUSED */ 869 int 870 nfs_sync(mp, waitfor, cred, p) 871 struct mount *mp; 872 int waitfor; 873 struct ucred *cred; 874 struct proc *p; 875 { 876 struct vnode *vp; 877 int error, allerror = 0; 878 879 /* 880 * Force stale buffer cache information to be flushed. 881 */ 882 loop: 883 for (vp = mp->mnt_vnodelist.lh_first; 884 vp != NULL; 885 vp = vp->v_mntvnodes.le_next) { 886 /* 887 * If the vnode that we are about to sync is no longer 888 * associated with this mount point, start over. 889 */ 890 if (vp->v_mount != mp) 891 goto loop; 892 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 893 (LIST_EMPTY(&vp->v_dirtyblkhd) && 894 vp->v_uobj.uo_npages == 0)) 895 continue; 896 if (vget(vp, LK_EXCLUSIVE)) 897 goto loop; 898 error = VOP_FSYNC(vp, cred, 899 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p); 900 if (error) 901 allerror = error; 902 vput(vp); 903 } 904 return (allerror); 905 } 906 907 /* 908 * NFS flat namespace lookup. 909 * Currently unsupported. 910 */ 911 /* ARGSUSED */ 912 int 913 nfs_vget(mp, ino, vpp) 914 struct mount *mp; 915 ino_t ino; 916 struct vnode **vpp; 917 { 918 919 return (EOPNOTSUPP); 920 } 921 922 /* 923 * Do that sysctl thang... 924 */ 925 int 926 nfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 927 int *name; 928 u_int namelen; 929 void *oldp; 930 size_t *oldlenp; 931 void *newp; 932 size_t newlen; 933 struct proc *p; 934 { 935 int rv; 936 937 /* 938 * All names at this level are terminal. 939 */ 940 if(namelen > 1) 941 return ENOTDIR; /* overloaded */ 942 943 switch(name[0]) { 944 case NFS_NFSSTATS: 945 if(!oldp) { 946 *oldlenp = sizeof nfsstats; 947 return 0; 948 } 949 950 if(*oldlenp < sizeof nfsstats) { 951 *oldlenp = sizeof nfsstats; 952 return ENOMEM; 953 } 954 955 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 956 if(rv) return rv; 957 958 if(newp && newlen != sizeof nfsstats) 959 return EINVAL; 960 961 if(newp) { 962 return copyin(newp, &nfsstats, sizeof nfsstats); 963 } 964 return 0; 965 966 case NFS_IOTHREADS: 967 nfs_getset_niothreads(0); 968 969 rv = (sysctl_int(oldp, oldlenp, newp, newlen, 970 &nfs_niothreads)); 971 972 if (newp) 973 nfs_getset_niothreads(1); 974 975 return rv; 976 977 default: 978 return EOPNOTSUPP; 979 } 980 } 981 982 983 /* 984 * At this point, this should never happen 985 */ 986 /* ARGSUSED */ 987 int 988 nfs_fhtovp(mp, fhp, vpp) 989 struct mount *mp; 990 struct fid *fhp; 991 struct vnode **vpp; 992 { 993 994 return (EINVAL); 995 } 996 997 /* ARGSUSED */ 998 int 999 nfs_checkexp(mp, nam, exflagsp, credanonp) 1000 struct mount *mp; 1001 struct mbuf *nam; 1002 int *exflagsp; 1003 struct ucred **credanonp; 1004 { 1005 1006 return (EINVAL); 1007 } 1008 1009 /* 1010 * Vnode pointer to File handle, should never happen either 1011 */ 1012 /* ARGSUSED */ 1013 int 1014 nfs_vptofh(vp, fhp) 1015 struct vnode *vp; 1016 struct fid *fhp; 1017 { 1018 1019 return (EINVAL); 1020 } 1021 1022 /* 1023 * Vfs start routine, a no-op. 1024 */ 1025 /* ARGSUSED */ 1026 int 1027 nfs_start(mp, flags, p) 1028 struct mount *mp; 1029 int flags; 1030 struct proc *p; 1031 { 1032 1033 return (0); 1034 } 1035 1036 /* 1037 * Do operations associated with quotas, not supported 1038 */ 1039 /* ARGSUSED */ 1040 int 1041 nfs_quotactl(mp, cmd, uid, arg, p) 1042 struct mount *mp; 1043 int cmd; 1044 uid_t uid; 1045 caddr_t arg; 1046 struct proc *p; 1047 { 1048 1049 return (EOPNOTSUPP); 1050 } 1051
Indexes created Wed Oct 01 07:09:59 GMT 2025