nfs_vfsops.c revision 1.140
1 /* $NetBSD: nfs_vfsops.c,v 1.140 2004/05/25 14:54:58 hannken 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.140 2004/05/25 14:54:58 hannken Exp $"); 39 40 #if defined(_KERNEL_OPT) 41 #include "opt_compat_netbsd.h" 42 #include "opt_nfs.h" 43 #endif 44 45 #include <sys/param.h> 46 #include <sys/ioctl.h> 47 #include <sys/signal.h> 48 #include <sys/proc.h> 49 #include <sys/namei.h> 50 #include <sys/device.h> 51 #include <sys/vnode.h> 52 #include <sys/kernel.h> 53 #include <sys/mount.h> 54 #include <sys/buf.h> 55 #include <sys/mbuf.h> 56 #include <sys/dirent.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/sysctl.h> 60 #include <sys/systm.h> 61 62 #include <net/if.h> 63 #include <net/route.h> 64 #include <netinet/in.h> 65 66 #include <nfs/rpcv2.h> 67 #include <nfs/nfsproto.h> 68 #include <nfs/nfsnode.h> 69 #include <nfs/nfs.h> 70 #include <nfs/nfsmount.h> 71 #include <nfs/xdr_subs.h> 72 #include <nfs/nfsm_subs.h> 73 #include <nfs/nfsdiskless.h> 74 #include <nfs/nqnfs.h> 75 #include <nfs/nfs_var.h> 76 77 extern struct nfsstats nfsstats; 78 extern int nfs_ticks; 79 80 MALLOC_DEFINE(M_NFSMNT, "NFS mount", "NFS mount structure"); 81 82 /* 83 * nfs vfs operations. 84 */ 85 86 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 87 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 88 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 89 90 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 91 &nfsv2_vnodeop_opv_desc, 92 &spec_nfsv2nodeop_opv_desc, 93 &fifo_nfsv2nodeop_opv_desc, 94 NULL, 95 }; 96 97 struct vfsops nfs_vfsops = { 98 MOUNT_NFS, 99 nfs_mount, 100 nfs_start, 101 nfs_unmount, 102 nfs_root, 103 nfs_quotactl, 104 nfs_statvfs, 105 nfs_sync, 106 nfs_vget, 107 nfs_fhtovp, 108 nfs_vptofh, 109 nfs_vfs_init, 110 nfs_vfs_reinit, 111 nfs_vfs_done, 112 NULL, 113 nfs_mountroot, 114 nfs_checkexp, 115 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 116 nfs_vnodeopv_descs, 117 }; 118 119 extern u_int32_t nfs_procids[NFS_NPROCS]; 120 extern u_int32_t nfs_prog, nfs_vers; 121 122 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 123 struct mount **, struct vnode **, struct proc *)); 124 125 /* 126 * nfs statvfs call 127 */ 128 int 129 nfs_statvfs(mp, sbp, p) 130 struct mount *mp; 131 struct statvfs *sbp; 132 struct proc *p; 133 { 134 struct vnode *vp; 135 struct nfs_statfs *sfp; 136 caddr_t cp; 137 u_int32_t *tl; 138 int32_t t1, t2; 139 caddr_t bpos, dpos, cp2; 140 struct nfsmount *nmp = VFSTONFS(mp); 141 int error = 0, retattr; 142 #ifdef NFS_V2_ONLY 143 const int v3 = 0; 144 #else 145 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 146 #endif 147 struct mbuf *mreq, *mrep = NULL, *md, *mb; 148 struct ucred *cred; 149 u_quad_t tquad; 150 struct nfsnode *np; 151 152 #ifndef nolint 153 sfp = (struct nfs_statfs *)0; 154 #endif 155 vp = nmp->nm_vnode; 156 np = VTONFS(vp); 157 cred = crget(); 158 cred->cr_ngroups = 0; 159 #ifndef NFS_V2_ONLY 160 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 161 (void)nfs_fsinfo(nmp, vp, cred, p); 162 #endif 163 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 164 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 165 nfsm_fhtom(np, v3); 166 nfsm_request(np, NFSPROC_FSSTAT, p, cred); 167 if (v3) 168 nfsm_postop_attr(vp, retattr, 0); 169 if (error) { 170 if (mrep != NULL) { 171 if (mrep->m_next != NULL) 172 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 173 m_freem(mrep); 174 } 175 goto nfsmout; 176 } 177 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 178 sbp->f_flag = nmp->nm_flag; 179 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 180 if (v3) { 181 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 182 tquad = fxdr_hyper(&sfp->sf_tbytes); 183 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 184 tquad = fxdr_hyper(&sfp->sf_fbytes); 185 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 186 tquad = fxdr_hyper(&sfp->sf_abytes); 187 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 188 sbp->f_bresvd = sbp->f_bfree - tquad; 189 sbp->f_bavail = tquad; 190 #ifdef COMPAT_20 191 /* Handle older NFS servers returning negative values */ 192 if ((quad_t)sbp->f_bavail < 0) 193 sbp->f_bavail = 0; 194 #endif 195 tquad = fxdr_hyper(&sfp->sf_tfiles); 196 sbp->f_files = tquad; 197 tquad = fxdr_hyper(&sfp->sf_ffiles); 198 sbp->f_ffree = tquad; 199 sbp->f_favail = tquad; 200 sbp->f_fresvd = 0; 201 sbp->f_namemax = MAXNAMLEN; 202 } else { 203 sbp->f_bsize = NFS_FABLKSIZE; 204 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 205 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 206 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 207 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 208 sbp->f_fresvd = 0; 209 sbp->f_files = 0; 210 sbp->f_ffree = 0; 211 sbp->f_favail = 0; 212 sbp->f_fresvd = 0; 213 sbp->f_namemax = MAXNAMLEN; 214 } 215 copy_statvfs_info(sbp, mp); 216 nfsm_reqdone; 217 crfree(cred); 218 return (error); 219 } 220 221 #ifndef NFS_V2_ONLY 222 /* 223 * nfs version 3 fsinfo rpc call 224 */ 225 int 226 nfs_fsinfo(nmp, vp, cred, p) 227 struct nfsmount *nmp; 228 struct vnode *vp; 229 struct ucred *cred; 230 struct proc *p; 231 { 232 struct nfsv3_fsinfo *fsp; 233 caddr_t cp; 234 int32_t t1, t2; 235 u_int32_t *tl, pref, max; 236 caddr_t bpos, dpos, cp2; 237 int error = 0, retattr; 238 struct mbuf *mreq, *mrep, *md, *mb; 239 u_int64_t maxfsize; 240 struct nfsnode *np = VTONFS(vp); 241 242 nfsstats.rpccnt[NFSPROC_FSINFO]++; 243 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 244 nfsm_fhtom(np, 1); 245 nfsm_request(np, NFSPROC_FSINFO, p, cred); 246 nfsm_postop_attr(vp, retattr, 0); 247 if (!error) { 248 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 249 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 250 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 251 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 252 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 253 ~(NFS_FABLKSIZE - 1); 254 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 255 if (max < nmp->nm_wsize && max > 0) { 256 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 257 if (nmp->nm_wsize == 0) 258 nmp->nm_wsize = max; 259 } 260 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 261 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 262 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 263 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 264 ~(NFS_FABLKSIZE - 1); 265 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 266 if (max < nmp->nm_rsize && max > 0) { 267 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 268 if (nmp->nm_rsize == 0) 269 nmp->nm_rsize = max; 270 } 271 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 272 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 273 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 274 ~(NFS_DIRFRAGSIZ - 1); 275 if (max < nmp->nm_readdirsize && max > 0) { 276 nmp->nm_readdirsize = max & ~(NFS_DIRFRAGSIZ - 1); 277 if (nmp->nm_readdirsize == 0) 278 nmp->nm_readdirsize = max; 279 } 280 /* XXX */ 281 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 282 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 283 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 284 nmp->nm_maxfilesize = maxfsize; 285 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 286 } 287 nfsm_reqdone; 288 return (error); 289 } 290 #endif 291 292 /* 293 * Mount a remote root fs via. NFS. It goes like this: 294 * - Call nfs_boot_init() to fill in the nfs_diskless struct 295 * - build the rootfs mount point and call mountnfs() to do the rest. 296 */ 297 int 298 nfs_mountroot() 299 { 300 struct nfs_diskless *nd; 301 struct vattr attr; 302 struct mount *mp; 303 struct vnode *vp; 304 struct proc *procp; 305 long n; 306 int error; 307 308 procp = curproc; /* XXX */ 309 310 if (root_device->dv_class != DV_IFNET) 311 return (ENODEV); 312 313 /* 314 * XXX time must be non-zero when we init the interface or else 315 * the arp code will wedge. [Fixed now in if_ether.c] 316 * However, the NFS attribute cache gives false "hits" when 317 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 318 */ 319 if (time.tv_sec < NFS_MAXATTRTIMO) 320 time.tv_sec = NFS_MAXATTRTIMO; 321 322 /* 323 * Call nfs_boot_init() to fill in the nfs_diskless struct. 324 * Side effect: Finds and configures a network interface. 325 */ 326 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 327 memset((caddr_t)nd, 0, sizeof(*nd)); 328 error = nfs_boot_init(nd, procp); 329 if (error) { 330 free(nd, M_NFSMNT); 331 return (error); 332 } 333 334 /* 335 * Create the root mount point. 336 */ 337 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, procp); 338 if (error) 339 goto out; 340 printf("root on %s\n", nd->nd_root.ndm_host); 341 342 /* 343 * Link it into the mount list. 344 */ 345 simple_lock(&mountlist_slock); 346 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 347 simple_unlock(&mountlist_slock); 348 rootvp = vp; 349 mp->mnt_vnodecovered = NULLVP; 350 vfs_unbusy(mp); 351 352 /* Get root attributes (for the time). */ 353 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 354 if (error) 355 panic("nfs_mountroot: getattr for root"); 356 n = attr.va_atime.tv_sec; 357 #ifdef DEBUG 358 printf("root time: 0x%lx\n", n); 359 #endif 360 inittodr(n); 361 362 out: 363 if (error) 364 nfs_boot_cleanup(nd, procp); 365 free(nd, M_NFSMNT); 366 return (error); 367 } 368 369 /* 370 * Internal version of mount system call for diskless setup. 371 * Separate function because we used to call it twice. 372 * (once for root and once for swap) 373 */ 374 static int 375 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, p) 376 struct nfs_dlmount *ndmntp; 377 const char *mntname; /* mount point name */ 378 struct mount **mpp; 379 struct vnode **vpp; 380 struct proc *p; 381 { 382 struct mount *mp; 383 struct mbuf *m; 384 int error; 385 386 vfs_rootmountalloc(MOUNT_NFS, (char *)mntname, &mp); 387 388 mp->mnt_op = &nfs_vfsops; 389 390 /* 391 * Historical practice expects NFS root file systems to 392 * be initially mounted r/w. 393 */ 394 mp->mnt_flag &= ~MNT_RDONLY; 395 396 /* Get mbuf for server sockaddr. */ 397 m = m_get(M_WAIT, MT_SONAME); 398 if (m == NULL) 399 panic("nfs_mountroot: mget soname for %s", mntname); 400 MCLAIM(m, &nfs_mowner); 401 memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr, 402 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 403 404 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 405 ndmntp->ndm_args.hostname, vpp, p); 406 if (error) { 407 mp->mnt_op->vfs_refcount--; 408 vfs_unbusy(mp); 409 printf("nfs_mountroot: mount %s failed: %d\n", 410 mntname, error); 411 free(mp, M_MOUNT); 412 } else 413 *mpp = mp; 414 415 return (error); 416 } 417 418 void 419 nfs_decode_args(nmp, argp, p) 420 struct nfsmount *nmp; 421 struct nfs_args *argp; 422 struct proc *p; 423 { 424 int s; 425 int adjsock; 426 int maxio; 427 428 s = splsoftnet(); 429 430 /* 431 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 432 * no sense in that context. 433 */ 434 if (argp->sotype == SOCK_STREAM) 435 argp->flags &= ~NFSMNT_NOCONN; 436 437 /* 438 * Cookie translation is not needed for v2, silently ignore it. 439 */ 440 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 441 NFSMNT_XLATECOOKIE) 442 argp->flags &= ~NFSMNT_XLATECOOKIE; 443 444 /* Re-bind if rsrvd port requested and wasn't on one */ 445 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 446 && (argp->flags & NFSMNT_RESVPORT); 447 /* Also re-bind if we're switching to/from a connected UDP socket */ 448 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 449 (argp->flags & NFSMNT_NOCONN)); 450 451 /* Update flags. */ 452 nmp->nm_flag = argp->flags; 453 splx(s); 454 455 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 456 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 457 if (nmp->nm_timeo < NFS_MINTIMEO) 458 nmp->nm_timeo = NFS_MINTIMEO; 459 else if (nmp->nm_timeo > NFS_MAXTIMEO) 460 nmp->nm_timeo = NFS_MAXTIMEO; 461 } 462 463 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 464 nmp->nm_retry = argp->retrans; 465 if (nmp->nm_retry > NFS_MAXREXMIT) 466 nmp->nm_retry = NFS_MAXREXMIT; 467 } 468 469 #ifndef NFS_V2_ONLY 470 if (argp->flags & NFSMNT_NFSV3) { 471 if (argp->sotype == SOCK_DGRAM) 472 maxio = NFS_MAXDGRAMDATA; 473 else 474 maxio = NFS_MAXDATA; 475 } else 476 #endif 477 maxio = NFS_V2MAXDATA; 478 479 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 480 int osize = nmp->nm_wsize; 481 nmp->nm_wsize = argp->wsize; 482 /* Round down to multiple of blocksize */ 483 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 484 if (nmp->nm_wsize <= 0) 485 nmp->nm_wsize = NFS_FABLKSIZE; 486 adjsock |= (nmp->nm_wsize != osize); 487 } 488 if (nmp->nm_wsize > maxio) 489 nmp->nm_wsize = maxio; 490 if (nmp->nm_wsize > MAXBSIZE) 491 nmp->nm_wsize = MAXBSIZE; 492 493 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 494 int osize = nmp->nm_rsize; 495 nmp->nm_rsize = argp->rsize; 496 /* Round down to multiple of blocksize */ 497 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 498 if (nmp->nm_rsize <= 0) 499 nmp->nm_rsize = NFS_FABLKSIZE; 500 adjsock |= (nmp->nm_rsize != osize); 501 } 502 if (nmp->nm_rsize > maxio) 503 nmp->nm_rsize = maxio; 504 if (nmp->nm_rsize > MAXBSIZE) 505 nmp->nm_rsize = MAXBSIZE; 506 507 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 508 nmp->nm_readdirsize = argp->readdirsize; 509 /* Round down to multiple of minimum blocksize */ 510 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 511 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 512 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 513 /* Bigger than buffer size makes no sense */ 514 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 515 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 516 } else if (argp->flags & NFSMNT_RSIZE) 517 nmp->nm_readdirsize = nmp->nm_rsize; 518 519 if (nmp->nm_readdirsize > maxio) 520 nmp->nm_readdirsize = maxio; 521 522 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 523 argp->maxgrouplist <= NFS_MAXGRPS) 524 nmp->nm_numgrps = argp->maxgrouplist; 525 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 526 argp->readahead <= NFS_MAXRAHEAD) 527 nmp->nm_readahead = argp->readahead; 528 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 529 argp->leaseterm <= NQ_MAXLEASE) 530 nmp->nm_leaseterm = argp->leaseterm; 531 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 532 argp->deadthresh <= NQ_NEVERDEAD) 533 nmp->nm_deadthresh = argp->deadthresh; 534 535 adjsock |= ((nmp->nm_sotype != argp->sotype) || 536 (nmp->nm_soproto != argp->proto)); 537 nmp->nm_sotype = argp->sotype; 538 nmp->nm_soproto = argp->proto; 539 540 if (nmp->nm_so && adjsock) { 541 nfs_safedisconnect(nmp); 542 if (nmp->nm_sotype == SOCK_DGRAM) 543 while (nfs_connect(nmp, (struct nfsreq *)0, p)) { 544 printf("nfs_args: retrying connect\n"); 545 (void) tsleep((caddr_t)&lbolt, 546 PSOCK, "nfscn3", 0); 547 } 548 } 549 } 550 551 /* 552 * VFS Operations. 553 * 554 * mount system call 555 * It seems a bit dumb to copyinstr() the host and path here and then 556 * memcpy() them in mountnfs(), but I wanted to detect errors before 557 * doing the sockargs() call because sockargs() allocates an mbuf and 558 * an error after that means that I have to release the mbuf. 559 */ 560 /* ARGSUSED */ 561 int 562 nfs_mount(mp, path, data, ndp, p) 563 struct mount *mp; 564 const char *path; 565 void *data; 566 struct nameidata *ndp; 567 struct proc *p; 568 { 569 int error; 570 struct nfs_args args; 571 struct mbuf *nam; 572 struct nfsmount *nmp = VFSTONFS(mp); 573 struct sockaddr *sa; 574 struct vnode *vp; 575 char *pth, *hst; 576 size_t len; 577 u_char *nfh; 578 579 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 580 if (error) 581 return (error); 582 583 if (mp->mnt_flag & MNT_GETARGS) { 584 585 if (nmp == NULL) 586 return (EIO); 587 if (args.addr != NULL) { 588 sa = mtod(nmp->nm_nam, struct sockaddr *); 589 error = copyout(sa, args.addr, sa->sa_len); 590 if (error) 591 return (error); 592 args.addrlen = sa->sa_len; 593 } else 594 args.addrlen = 0; 595 596 args.version = NFS_ARGSVERSION; 597 args.sotype = nmp->nm_sotype; 598 args.proto = nmp->nm_soproto; 599 args.fh = NULL; 600 args.fhsize = 0; 601 args.flags = nmp->nm_flag; 602 args.wsize = nmp->nm_wsize; 603 args.rsize = nmp->nm_rsize; 604 args.readdirsize = nmp->nm_readdirsize; 605 args.timeo = nmp->nm_timeo; 606 args.retrans = nmp->nm_retry; 607 args.maxgrouplist = nmp->nm_numgrps; 608 args.readahead = nmp->nm_readahead; 609 args.leaseterm = nmp->nm_leaseterm; 610 args.deadthresh = nmp->nm_deadthresh; 611 args.hostname = NULL; 612 return (copyout(&args, data, sizeof(args))); 613 } 614 615 if (args.version != NFS_ARGSVERSION) 616 return (EPROGMISMATCH); 617 #ifdef NFS_V2_ONLY 618 if (args.flags & NFSMNT_NQNFS) 619 return (EPROGUNAVAIL); 620 if (args.flags & NFSMNT_NFSV3) 621 return (EPROGMISMATCH); 622 #endif 623 if (mp->mnt_flag & MNT_UPDATE) { 624 if (nmp == NULL) 625 return (EIO); 626 /* 627 * When doing an update, we can't change from or to 628 * v3 and/or nqnfs, or change cookie translation 629 */ 630 args.flags = (args.flags & 631 ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) | 632 (nmp->nm_flag & 633 (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)); 634 nfs_decode_args(nmp, &args, p); 635 return (0); 636 } 637 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 638 return (EINVAL); 639 MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK); 640 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 641 if (error) 642 return (error); 643 MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK); 644 error = copyinstr(path, pth, MNAMELEN - 1, &len); 645 if (error) 646 goto free_nfh; 647 memset(&pth[len], 0, MNAMELEN - len); 648 MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK); 649 error = copyinstr(args.hostname, hst, MNAMELEN - 1, &len); 650 if (error) 651 goto free_pth; 652 memset(&hst[len], 0, MNAMELEN - len); 653 /* sockargs() call must be after above copyin() calls */ 654 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 655 if (error) 656 goto free_hst; 657 MCLAIM(nam, &nfs_mowner); 658 args.fh = nfh; 659 error = mountnfs(&args, mp, nam, pth, hst, &vp, p); 660 661 free_hst: 662 FREE(hst, M_TEMP); 663 free_pth: 664 FREE(pth, M_TEMP); 665 free_nfh: 666 FREE(nfh, M_TEMP); 667 668 return (error); 669 } 670 671 /* 672 * Common code for mount and mountroot 673 */ 674 int 675 mountnfs(argp, mp, nam, pth, hst, vpp, p) 676 struct nfs_args *argp; 677 struct mount *mp; 678 struct mbuf *nam; 679 const char *pth, *hst; 680 struct vnode **vpp; 681 struct proc *p; 682 { 683 struct nfsmount *nmp; 684 struct nfsnode *np; 685 int error; 686 struct vattr *attrs; 687 struct ucred *cr; 688 689 /* 690 * If the number of nfs iothreads to use has never 691 * been set, create a reasonable number of them. 692 */ 693 694 if (nfs_niothreads < 0) { 695 nfs_niothreads = NFS_DEFAULT_NIOTHREADS; 696 nfs_getset_niothreads(TRUE); 697 } 698 699 if (mp->mnt_flag & MNT_UPDATE) { 700 nmp = VFSTONFS(mp); 701 /* update paths, file handles, etc, here XXX */ 702 m_freem(nam); 703 return (0); 704 } else { 705 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 706 M_NFSMNT, M_WAITOK); 707 memset((caddr_t)nmp, 0, sizeof (struct nfsmount)); 708 mp->mnt_data = nmp; 709 TAILQ_INIT(&nmp->nm_uidlruhead); 710 TAILQ_INIT(&nmp->nm_bufq); 711 lockinit(&nmp->nm_writeverflock, PRIBIO, "nfswverf", 0, 0); 712 simple_lock_init(&nmp->nm_slock); 713 } 714 vfs_getnewfsid(mp); 715 nmp->nm_mountp = mp; 716 717 #ifndef NFS_V2_ONLY 718 if (argp->flags & NFSMNT_NQNFS) 719 /* 720 * We have to set mnt_maxsymlink to a non-zero value so 721 * that COMPAT_43 routines will know that we are setting 722 * the d_type field in directories (and can zero it for 723 * unsuspecting binaries). 724 */ 725 mp->mnt_maxsymlinklen = 1; 726 #endif 727 728 #ifndef NFS_V2_ONLY 729 if ((argp->flags & NFSMNT_NFSV3) == 0) 730 #endif 731 /* 732 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 733 * will fill this in. 734 */ 735 nmp->nm_maxfilesize = 0xffffffffLL; 736 737 nmp->nm_timeo = NFS_TIMEO; 738 nmp->nm_retry = NFS_RETRANS; 739 nmp->nm_wsize = NFS_WSIZE; 740 nmp->nm_rsize = NFS_RSIZE; 741 nmp->nm_readdirsize = NFS_READDIRSIZE; 742 nmp->nm_numgrps = NFS_MAXGRPS; 743 nmp->nm_readahead = NFS_DEFRAHEAD; 744 nmp->nm_leaseterm = NQ_DEFLEASE; 745 nmp->nm_deadthresh = NQ_DEADTHRESH; 746 CIRCLEQ_INIT(&nmp->nm_timerhead); 747 nmp->nm_inprog = NULLVP; 748 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, mp, p); 749 if (error) 750 goto bad; 751 nmp->nm_nam = nam; 752 753 /* Set up the sockets and per-host congestion */ 754 nmp->nm_sotype = argp->sotype; 755 nmp->nm_soproto = argp->proto; 756 757 nfs_decode_args(nmp, argp, p); 758 759 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 760 mp->mnt_dev_bshift = DEV_BSHIFT; 761 762 /* 763 * For Connection based sockets (TCP,...) defer the connect until 764 * the first request, in case the server is not responding. 765 */ 766 if (nmp->nm_sotype == SOCK_DGRAM && 767 (error = nfs_connect(nmp, (struct nfsreq *)0, p))) 768 goto bad; 769 770 /* 771 * This is silly, but it has to be set so that vinifod() works. 772 * We do not want to do an nfs_statvfs() here since we can get 773 * stuck on a dead server and we are holding a lock on the mount 774 * point. 775 */ 776 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 777 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 778 if (error) 779 goto bad; 780 *vpp = NFSTOV(np); 781 MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK); 782 VOP_GETATTR(*vpp, attrs, p->p_ucred, p); 783 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 784 cr = crget(); 785 cr->cr_uid = attrs->va_uid; 786 cr->cr_gid = attrs->va_gid; 787 cr->cr_ngroups = 0; 788 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, p, cr); 789 crfree(cr); 790 } 791 FREE(attrs, M_TEMP); 792 793 /* 794 * A reference count is needed on the nfsnode representing the 795 * remote root. If this object is not persistent, then backward 796 * traversals of the mount point (i.e. "..") will not work if 797 * the nfsnode gets flushed out of the cache. Ufs does not have 798 * this problem, because one can identify root inodes by their 799 * number == ROOTINO (2). So, just unlock, but no rele. 800 */ 801 802 nmp->nm_vnode = *vpp; 803 VOP_UNLOCK(*vpp, 0); 804 805 return (0); 806 bad: 807 nfs_disconnect(nmp); 808 free((caddr_t)nmp, M_NFSMNT); 809 m_freem(nam); 810 return (error); 811 } 812 813 /* 814 * unmount system call 815 */ 816 int 817 nfs_unmount(mp, mntflags, p) 818 struct mount *mp; 819 int mntflags; 820 struct proc *p; 821 { 822 struct nfsmount *nmp; 823 struct vnode *vp; 824 int error, flags = 0; 825 826 if (mntflags & MNT_FORCE) 827 flags |= FORCECLOSE; 828 nmp = VFSTONFS(mp); 829 /* 830 * Goes something like this.. 831 * - Check for activity on the root vnode (other than ourselves). 832 * - Call vflush() to clear out vnodes for this file system, 833 * except for the root vnode. 834 * - Decrement reference on the vnode representing remote root. 835 * - Close the socket 836 * - Free up the data structures 837 */ 838 /* 839 * We need to decrement the ref. count on the nfsnode representing 840 * the remote root. See comment in mountnfs(). The VFS unmount() 841 * has done vput on this vnode, otherwise we would get deadlock! 842 */ 843 vp = nmp->nm_vnode; 844 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 845 if (error != 0) 846 return error; 847 848 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 849 vput(vp); 850 return (EBUSY); 851 } 852 853 /* 854 * Must handshake with nqnfs_clientd() if it is active. 855 */ 856 nmp->nm_iflag |= NFSMNT_DISMINPROG; 857 while (nmp->nm_inprog != NULLVP) 858 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 859 error = vflush(mp, vp, flags); 860 if (error) { 861 vput(vp); 862 nmp->nm_iflag &= ~NFSMNT_DISMINPROG; 863 return (error); 864 } 865 866 /* 867 * We are now committed to the unmount; mark the mount structure 868 * as doomed so that any sleepers kicked awake by nfs_disconnect 869 * will go away cleanly. 870 */ 871 nmp->nm_iflag |= NFSMNT_DISMNT; 872 873 /* 874 * There are two reference counts to get rid of here 875 * (see comment in mountnfs()). 876 */ 877 vrele(vp); 878 vput(vp); 879 vgone(vp); 880 nfs_disconnect(nmp); 881 m_freem(nmp->nm_nam); 882 883 /* 884 * For NQNFS, let the server daemon free the nfsmount structure. 885 */ 886 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 887 free((caddr_t)nmp, M_NFSMNT); 888 return (0); 889 } 890 891 /* 892 * Return root of a filesystem 893 */ 894 int 895 nfs_root(mp, vpp) 896 struct mount *mp; 897 struct vnode **vpp; 898 { 899 struct vnode *vp; 900 struct nfsmount *nmp; 901 int error; 902 903 nmp = VFSTONFS(mp); 904 vp = nmp->nm_vnode; 905 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 906 if (error != 0) 907 return error; 908 if (vp->v_type == VNON) 909 vp->v_type = VDIR; 910 vp->v_flag = VROOT; 911 *vpp = vp; 912 return (0); 913 } 914 915 extern int syncprt; 916 917 /* 918 * Flush out the buffer cache 919 */ 920 /* ARGSUSED */ 921 int 922 nfs_sync(mp, waitfor, cred, p) 923 struct mount *mp; 924 int waitfor; 925 struct ucred *cred; 926 struct proc *p; 927 { 928 struct vnode *vp; 929 int error, allerror = 0; 930 931 /* 932 * Force stale buffer cache information to be flushed. 933 */ 934 loop: 935 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 936 /* 937 * If the vnode that we are about to sync is no longer 938 * associated with this mount point, start over. 939 */ 940 if (vp->v_mount != mp) 941 goto loop; 942 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 943 (LIST_EMPTY(&vp->v_dirtyblkhd) && 944 vp->v_uobj.uo_npages == 0)) 945 continue; 946 if (vget(vp, LK_EXCLUSIVE)) 947 goto loop; 948 error = VOP_FSYNC(vp, cred, 949 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p); 950 if (error) 951 allerror = error; 952 vput(vp); 953 } 954 return (allerror); 955 } 956 957 /* 958 * NFS flat namespace lookup. 959 * Currently unsupported. 960 */ 961 /* ARGSUSED */ 962 int 963 nfs_vget(mp, ino, vpp) 964 struct mount *mp; 965 ino_t ino; 966 struct vnode **vpp; 967 { 968 969 return (EOPNOTSUPP); 970 } 971 972 /* 973 * Do that sysctl thang... 974 */ 975 static int 976 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 977 { 978 int error; 979 980 nfs_getset_niothreads(0); 981 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 982 if (error || newp == NULL) 983 return (error); 984 nfs_getset_niothreads(1); 985 986 return (0); 987 } 988 989 SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup") 990 { 991 992 sysctl_createv(clog, 0, NULL, NULL, 993 CTLFLAG_PERMANENT, 994 CTLTYPE_NODE, "vfs", NULL, 995 NULL, 0, NULL, 0, 996 CTL_VFS, CTL_EOL); 997 sysctl_createv(clog, 0, NULL, NULL, 998 CTLFLAG_PERMANENT, 999 CTLTYPE_NODE, "nfs", 1000 SYSCTL_DESCR("NFS vfs options"), 1001 NULL, 0, NULL, 0, 1002 CTL_VFS, 2, CTL_EOL); 1003 /* 1004 * XXX the "2" above could be dynamic, thereby eliminating one 1005 * more instance of the "number to vfs" mapping problem, but 1006 * "2" is the order as taken from sys/mount.h 1007 */ 1008 1009 sysctl_createv(clog, 0, NULL, NULL, 1010 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1011 CTLTYPE_STRUCT, "nfsstats", 1012 SYSCTL_DESCR("NFS operation statistics"), 1013 NULL, 0, &nfsstats, sizeof(nfsstats), 1014 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1015 sysctl_createv(clog, 0, NULL, NULL, 1016 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1017 CTLTYPE_INT, "iothreads", 1018 SYSCTL_DESCR("Number of NFS client processes desired"), 1019 sysctl_vfs_nfs_iothreads, 0, &nfs_niothreads, 0, 1020 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1021 } 1022 1023 /* 1024 * At this point, this should never happen 1025 */ 1026 /* ARGSUSED */ 1027 int 1028 nfs_fhtovp(mp, fhp, vpp) 1029 struct mount *mp; 1030 struct fid *fhp; 1031 struct vnode **vpp; 1032 { 1033 1034 return (EINVAL); 1035 } 1036 1037 /* ARGSUSED */ 1038 int 1039 nfs_checkexp(mp, nam, exflagsp, credanonp) 1040 struct mount *mp; 1041 struct mbuf *nam; 1042 int *exflagsp; 1043 struct ucred **credanonp; 1044 { 1045 1046 return (EINVAL); 1047 } 1048 1049 /* 1050 * Vnode pointer to File handle, should never happen either 1051 */ 1052 /* ARGSUSED */ 1053 int 1054 nfs_vptofh(vp, fhp) 1055 struct vnode *vp; 1056 struct fid *fhp; 1057 { 1058 1059 return (EINVAL); 1060 } 1061 1062 /* 1063 * Vfs start routine, a no-op. 1064 */ 1065 /* ARGSUSED */ 1066 int 1067 nfs_start(mp, flags, p) 1068 struct mount *mp; 1069 int flags; 1070 struct proc *p; 1071 { 1072 1073 return (0); 1074 } 1075 1076 /* 1077 * Do operations associated with quotas, not supported 1078 */ 1079 /* ARGSUSED */ 1080 int 1081 nfs_quotactl(mp, cmd, uid, arg, p) 1082 struct mount *mp; 1083 int cmd; 1084 uid_t uid; 1085 void *arg; 1086 struct proc *p; 1087 { 1088 1089 return (EOPNOTSUPP); 1090 } 1091
Indexes created Wed Sep 24 14:09:57 GMT 2025