nfs_vfsops.c revision 1.125
1 /* $NetBSD: nfs_vfsops.c,v 1.125 2003/04/16 21:44:25 christos 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 1.125 2003/04/16 21:44:25 christos 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/proc.h> 53 #include <sys/namei.h> 54 #include <sys/device.h> 55 #include <sys/vnode.h> 56 #include <sys/kernel.h> 57 #include <sys/mount.h> 58 #include <sys/buf.h> 59 #include <sys/mbuf.h> 60 #include <sys/socket.h> 61 #include <sys/socketvar.h> 62 #include <sys/sysctl.h> 63 #include <sys/systm.h> 64 65 #include <net/if.h> 66 #include <net/route.h> 67 #include <netinet/in.h> 68 69 #include <nfs/rpcv2.h> 70 #include <nfs/nfsproto.h> 71 #include <nfs/nfsnode.h> 72 #include <nfs/nfs.h> 73 #include <nfs/nfsmount.h> 74 #include <nfs/xdr_subs.h> 75 #include <nfs/nfsm_subs.h> 76 #include <nfs/nfsdiskless.h> 77 #include <nfs/nqnfs.h> 78 #include <nfs/nfs_var.h> 79 80 extern struct nfsstats nfsstats; 81 extern int nfs_ticks; 82 83 MALLOC_DEFINE(M_NFSMNT, "NFS mount", "NFS mount structure"); 84 85 int nfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 86 struct proc *)); 87 88 /* 89 * nfs vfs operations. 90 */ 91 92 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 93 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 94 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 95 96 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 97 &nfsv2_vnodeop_opv_desc, 98 &spec_nfsv2nodeop_opv_desc, 99 &fifo_nfsv2nodeop_opv_desc, 100 NULL, 101 }; 102 103 struct vfsops nfs_vfsops = { 104 MOUNT_NFS, 105 nfs_mount, 106 nfs_start, 107 nfs_unmount, 108 nfs_root, 109 nfs_quotactl, 110 nfs_statfs, 111 nfs_sync, 112 nfs_vget, 113 nfs_fhtovp, 114 nfs_vptofh, 115 nfs_vfs_init, 116 nfs_vfs_reinit, 117 nfs_vfs_done, 118 nfs_sysctl, 119 nfs_mountroot, 120 nfs_checkexp, 121 nfs_vnodeopv_descs, 122 }; 123 124 extern u_int32_t nfs_procids[NFS_NPROCS]; 125 extern u_int32_t nfs_prog, nfs_vers; 126 127 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 128 struct mount **, struct vnode **, struct proc *)); 129 130 #define TRUE 1 131 #define FALSE 0 132 133 /* 134 * nfs statfs call 135 */ 136 int 137 nfs_statfs(mp, sbp, p) 138 struct mount *mp; 139 struct statfs *sbp; 140 struct proc *p; 141 { 142 struct vnode *vp; 143 struct nfs_statfs *sfp; 144 caddr_t cp; 145 u_int32_t *tl; 146 int32_t t1, t2; 147 caddr_t bpos, dpos, cp2; 148 struct nfsmount *nmp = VFSTONFS(mp); 149 int error = 0, retattr; 150 #ifdef NFS_V2_ONLY 151 const int v3 = 0; 152 #else 153 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 154 #endif 155 struct mbuf *mreq, *mrep = NULL, *md, *mb; 156 struct ucred *cred; 157 u_quad_t tquad; 158 159 #ifndef nolint 160 sfp = (struct nfs_statfs *)0; 161 #endif 162 vp = nmp->nm_vnode; 163 cred = crget(); 164 cred->cr_ngroups = 0; 165 #ifndef NFS_V2_ONLY 166 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 167 (void)nfs_fsinfo(nmp, vp, cred, p); 168 #endif 169 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 170 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 171 nfsm_fhtom(vp, v3); 172 nfsm_request(vp, NFSPROC_FSSTAT, p, cred); 173 if (v3) 174 nfsm_postop_attr(vp, retattr, 0); 175 if (error) { 176 if (mrep != NULL) 177 m_free(mrep); 178 goto nfsmout; 179 } 180 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 181 #ifdef COMPAT_09 182 sbp->f_type = 2; 183 #else 184 sbp->f_type = 0; 185 #endif 186 sbp->f_flags = nmp->nm_flag; 187 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 188 if (v3) { 189 sbp->f_bsize = NFS_FABLKSIZE; 190 tquad = fxdr_hyper(&sfp->sf_tbytes); 191 sbp->f_blocks = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 192 tquad = fxdr_hyper(&sfp->sf_fbytes); 193 sbp->f_bfree = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 194 tquad = fxdr_hyper(&sfp->sf_abytes); 195 sbp->f_bavail = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 196 tquad = fxdr_hyper(&sfp->sf_tfiles); 197 sbp->f_files = (long)tquad; 198 tquad = fxdr_hyper(&sfp->sf_ffiles); 199 sbp->f_ffree = (long)tquad; 200 } else { 201 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 202 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 203 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 204 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 205 sbp->f_files = 0; 206 sbp->f_ffree = 0; 207 } 208 copy_statfs_info(sbp, mp); 209 nfsm_reqdone; 210 crfree(cred); 211 return (error); 212 } 213 214 #ifndef NFS_V2_ONLY 215 /* 216 * nfs version 3 fsinfo rpc call 217 */ 218 int 219 nfs_fsinfo(nmp, vp, cred, p) 220 struct nfsmount *nmp; 221 struct vnode *vp; 222 struct ucred *cred; 223 struct proc *p; 224 { 225 struct nfsv3_fsinfo *fsp; 226 caddr_t cp; 227 int32_t t1, t2; 228 u_int32_t *tl, pref, max; 229 caddr_t bpos, dpos, cp2; 230 int error = 0, retattr; 231 struct mbuf *mreq, *mrep, *md, *mb; 232 u_int64_t maxfsize; 233 234 nfsstats.rpccnt[NFSPROC_FSINFO]++; 235 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 236 nfsm_fhtom(vp, 1); 237 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 238 nfsm_postop_attr(vp, retattr, 0); 239 if (!error) { 240 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 241 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 242 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 243 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 244 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 245 ~(NFS_FABLKSIZE - 1); 246 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 247 if (max < nmp->nm_wsize && max > 0) { 248 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 249 if (nmp->nm_wsize == 0) 250 nmp->nm_wsize = max; 251 } 252 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 253 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 254 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 255 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 256 ~(NFS_FABLKSIZE - 1); 257 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 258 if (max < nmp->nm_rsize && max > 0) { 259 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 260 if (nmp->nm_rsize == 0) 261 nmp->nm_rsize = max; 262 } 263 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 264 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 265 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 266 ~(NFS_DIRFRAGSIZ - 1); 267 if (max < nmp->nm_readdirsize && max > 0) { 268 nmp->nm_readdirsize = max & ~(NFS_DIRFRAGSIZ - 1); 269 if (nmp->nm_readdirsize == 0) 270 nmp->nm_readdirsize = max; 271 } 272 /* XXX */ 273 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 274 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 275 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 276 nmp->nm_maxfilesize = maxfsize; 277 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 278 } 279 nfsm_reqdone; 280 return (error); 281 } 282 #endif 283 284 /* 285 * Mount a remote root fs via. NFS. It goes like this: 286 * - Call nfs_boot_init() to fill in the nfs_diskless struct 287 * - build the rootfs mount point and call mountnfs() to do the rest. 288 */ 289 int 290 nfs_mountroot() 291 { 292 struct nfs_diskless *nd; 293 struct vattr attr; 294 struct mount *mp; 295 struct vnode *vp; 296 struct proc *procp; 297 long n; 298 int error; 299 300 procp = curproc; /* XXX */ 301 302 if (root_device->dv_class != DV_IFNET) 303 return (ENODEV); 304 305 /* 306 * XXX time must be non-zero when we init the interface or else 307 * the arp code will wedge. [Fixed now in if_ether.c] 308 * However, the NFS attribute cache gives false "hits" when 309 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 310 */ 311 if (time.tv_sec < NFS_MAXATTRTIMO) 312 time.tv_sec = NFS_MAXATTRTIMO; 313 314 /* 315 * Call nfs_boot_init() to fill in the nfs_diskless struct. 316 * Side effect: Finds and configures a network interface. 317 */ 318 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 319 memset((caddr_t)nd, 0, sizeof(*nd)); 320 error = nfs_boot_init(nd, procp); 321 if (error) { 322 free(nd, M_NFSMNT); 323 return (error); 324 } 325 326 /* 327 * Create the root mount point. 328 */ 329 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, procp); 330 if (error) 331 goto out; 332 printf("root on %s\n", nd->nd_root.ndm_host); 333 334 /* 335 * Link it into the mount list. 336 */ 337 simple_lock(&mountlist_slock); 338 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 339 simple_unlock(&mountlist_slock); 340 rootvp = vp; 341 mp->mnt_vnodecovered = NULLVP; 342 vfs_unbusy(mp); 343 344 /* Get root attributes (for the time). */ 345 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 346 if (error) 347 panic("nfs_mountroot: getattr for root"); 348 n = attr.va_atime.tv_sec; 349 #ifdef DEBUG 350 printf("root time: 0x%lx\n", n); 351 #endif 352 inittodr(n); 353 354 out: 355 if (error) 356 nfs_boot_cleanup(nd, procp); 357 free(nd, M_NFSMNT); 358 return (error); 359 } 360 361 /* 362 * Internal version of mount system call for diskless setup. 363 * Separate function because we used to call it twice. 364 * (once for root and once for swap) 365 */ 366 static int 367 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, p) 368 struct nfs_dlmount *ndmntp; 369 const char *mntname; /* mount point name */ 370 struct mount **mpp; 371 struct vnode **vpp; 372 struct proc *p; 373 { 374 struct mount *mp; 375 struct mbuf *m; 376 int error; 377 378 vfs_rootmountalloc(MOUNT_NFS, (char *)mntname, &mp); 379 380 mp->mnt_op = &nfs_vfsops; 381 382 /* 383 * Historical practice expects NFS root file systems to 384 * be initially mounted r/w. 385 */ 386 mp->mnt_flag &= ~MNT_RDONLY; 387 388 /* Get mbuf for server sockaddr. */ 389 m = m_get(M_WAIT, MT_SONAME); 390 if (m == NULL) 391 panic("nfs_mountroot: mget soname for %s", mntname); 392 MCLAIM(m, &nfs_mowner); 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 nfsmount *nmp = VFSTONFS(mp); 564 struct sockaddr *sa; 565 struct vnode *vp; 566 char *pth, *hst; 567 size_t len; 568 u_char *nfh; 569 570 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 571 if (error) 572 return (error); 573 574 if (mp->mnt_flag & MNT_GETARGS) { 575 576 if (nmp == NULL) 577 return (EIO); 578 if (args.addr != NULL) { 579 sa = mtod(nmp->nm_nam, struct sockaddr *); 580 error = copyout(sa, args.addr, sa->sa_len); 581 if (error) 582 return (error); 583 args.addrlen = sa->sa_len; 584 } else 585 args.addrlen = 0; 586 587 args.version = NFS_ARGSVERSION; 588 args.sotype = nmp->nm_sotype; 589 args.proto = nmp->nm_soproto; 590 args.fh = NULL; 591 args.fhsize = 0; 592 args.flags = nmp->nm_flag; 593 args.wsize = nmp->nm_wsize; 594 args.rsize = nmp->nm_rsize; 595 args.readdirsize = nmp->nm_readdirsize; 596 args.timeo = nmp->nm_timeo; 597 args.retrans = nmp->nm_retry; 598 args.maxgrouplist = nmp->nm_numgrps; 599 args.readahead = nmp->nm_readahead; 600 args.leaseterm = nmp->nm_leaseterm; 601 args.deadthresh = nmp->nm_deadthresh; 602 args.hostname = NULL; 603 return (copyout(&args, data, sizeof(args))); 604 } 605 606 if (args.version != NFS_ARGSVERSION) 607 return (EPROGMISMATCH); 608 #ifdef NFS_V2_ONLY 609 if (args.flags & NFSMNT_NQNFS) 610 return (EPROGUNAVAIL); 611 if (args.flags & NFSMNT_NFSV3) 612 return (EPROGMISMATCH); 613 #endif 614 if (mp->mnt_flag & MNT_UPDATE) { 615 if (nmp == NULL) 616 return (EIO); 617 /* 618 * When doing an update, we can't change from or to 619 * v3 and/or nqnfs, or change cookie translation 620 */ 621 args.flags = (args.flags & 622 ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) | 623 (nmp->nm_flag & 624 (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)); 625 nfs_decode_args(nmp, &args); 626 return (0); 627 } 628 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 629 return (EINVAL); 630 MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK); 631 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 632 if (error) 633 return (error); 634 MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK); 635 error = copyinstr(path, pth, MNAMELEN - 1, &len); 636 if (error) 637 goto free_nfh; 638 memset(&pth[len], 0, MNAMELEN - len); 639 MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK); 640 error = copyinstr(args.hostname, hst, MNAMELEN - 1, &len); 641 if (error) 642 goto free_pth; 643 memset(&hst[len], 0, MNAMELEN - len); 644 /* sockargs() call must be after above copyin() calls */ 645 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 646 if (error) 647 goto free_hst; 648 MCLAIM(nam, &nfs_mowner); 649 args.fh = nfh; 650 error = mountnfs(&args, mp, nam, pth, hst, &vp, p); 651 652 free_hst: 653 FREE(hst, M_TEMP); 654 free_pth: 655 FREE(pth, M_TEMP); 656 free_nfh: 657 FREE(nfh, M_TEMP); 658 659 return (error); 660 } 661 662 /* 663 * Common code for mount and mountroot 664 */ 665 int 666 mountnfs(argp, mp, nam, pth, hst, vpp, p) 667 struct nfs_args *argp; 668 struct mount *mp; 669 struct mbuf *nam; 670 const char *pth, *hst; 671 struct vnode **vpp; 672 struct proc *p; 673 { 674 struct nfsmount *nmp; 675 struct nfsnode *np; 676 int error; 677 struct vattr *attrs; 678 struct ucred *cr; 679 680 /* 681 * If the number of nfs iothreads to use has never 682 * been set, create a reasonable number of them. 683 */ 684 685 if (nfs_niothreads < 0) { 686 nfs_niothreads = NFS_DEFAULT_NIOTHREADS; 687 nfs_getset_niothreads(TRUE); 688 } 689 690 if (mp->mnt_flag & MNT_UPDATE) { 691 nmp = VFSTONFS(mp); 692 /* update paths, file handles, etc, here XXX */ 693 m_freem(nam); 694 return (0); 695 } else { 696 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 697 M_NFSMNT, M_WAITOK); 698 memset((caddr_t)nmp, 0, sizeof (struct nfsmount)); 699 mp->mnt_data = nmp; 700 TAILQ_INIT(&nmp->nm_uidlruhead); 701 TAILQ_INIT(&nmp->nm_bufq); 702 } 703 vfs_getnewfsid(mp); 704 nmp->nm_mountp = mp; 705 706 #ifndef NFS_V2_ONLY 707 if (argp->flags & NFSMNT_NQNFS) 708 /* 709 * We have to set mnt_maxsymlink to a non-zero value so 710 * that COMPAT_43 routines will know that we are setting 711 * the d_type field in directories (and can zero it for 712 * unsuspecting binaries). 713 */ 714 mp->mnt_maxsymlinklen = 1; 715 #endif 716 717 #ifndef NFS_V2_ONLY 718 if ((argp->flags & NFSMNT_NFSV3) == 0) 719 #endif 720 /* 721 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 722 * will fill this in. 723 */ 724 nmp->nm_maxfilesize = 0xffffffffLL; 725 726 nmp->nm_timeo = NFS_TIMEO; 727 nmp->nm_retry = NFS_RETRANS; 728 nmp->nm_wsize = NFS_WSIZE; 729 nmp->nm_rsize = NFS_RSIZE; 730 nmp->nm_readdirsize = NFS_READDIRSIZE; 731 nmp->nm_numgrps = NFS_MAXGRPS; 732 nmp->nm_readahead = NFS_DEFRAHEAD; 733 nmp->nm_leaseterm = NQ_DEFLEASE; 734 nmp->nm_deadthresh = NQ_DEADTHRESH; 735 CIRCLEQ_INIT(&nmp->nm_timerhead); 736 nmp->nm_inprog = NULLVP; 737 #ifdef COMPAT_09 738 mp->mnt_stat.f_type = 2; 739 #else 740 mp->mnt_stat.f_type = 0; 741 #endif 742 error = set_statfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, mp, p); 743 if (error) 744 goto bad; 745 nmp->nm_nam = nam; 746 747 /* Set up the sockets and per-host congestion */ 748 nmp->nm_sotype = argp->sotype; 749 nmp->nm_soproto = argp->proto; 750 751 nfs_decode_args(nmp, argp); 752 753 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 754 mp->mnt_dev_bshift = DEV_BSHIFT; 755 756 /* 757 * For Connection based sockets (TCP,...) defer the connect until 758 * the first request, in case the server is not responding. 759 */ 760 if (nmp->nm_sotype == SOCK_DGRAM && 761 (error = nfs_connect(nmp, (struct nfsreq *)0))) 762 goto bad; 763 764 /* 765 * This is silly, but it has to be set so that vinifod() works. 766 * We do not want to do an nfs_statfs() here since we can get 767 * stuck on a dead server and we are holding a lock on the mount 768 * point. 769 */ 770 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 771 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 772 if (error) 773 goto bad; 774 *vpp = NFSTOV(np); 775 MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK); 776 VOP_GETATTR(*vpp, attrs, p->p_ucred, p); 777 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 778 cr = crget(); 779 cr->cr_uid = attrs->va_uid; 780 cr->cr_gid = attrs->va_gid; 781 cr->cr_ngroups = 0; 782 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, p, cr); 783 crfree(cr); 784 } 785 FREE(attrs, M_TEMP); 786 787 /* 788 * A reference count is needed on the nfsnode representing the 789 * remote root. If this object is not persistent, then backward 790 * traversals of the mount point (i.e. "..") will not work if 791 * the nfsnode gets flushed out of the cache. Ufs does not have 792 * this problem, because one can identify root inodes by their 793 * number == ROOTINO (2). So, just unlock, but no rele. 794 */ 795 796 nmp->nm_vnode = *vpp; 797 VOP_UNLOCK(*vpp, 0); 798 799 return (0); 800 bad: 801 nfs_disconnect(nmp); 802 free((caddr_t)nmp, M_NFSMNT); 803 m_freem(nam); 804 return (error); 805 } 806 807 /* 808 * unmount system call 809 */ 810 int 811 nfs_unmount(mp, mntflags, p) 812 struct mount *mp; 813 int mntflags; 814 struct proc *p; 815 { 816 struct nfsmount *nmp; 817 struct vnode *vp; 818 int error, flags = 0; 819 820 if (mntflags & MNT_FORCE) 821 flags |= FORCECLOSE; 822 nmp = VFSTONFS(mp); 823 /* 824 * Goes something like this.. 825 * - Check for activity on the root vnode (other than ourselves). 826 * - Call vflush() to clear out vnodes for this file system, 827 * except for the root vnode. 828 * - Decrement reference on the vnode representing remote root. 829 * - Close the socket 830 * - Free up the data structures 831 */ 832 /* 833 * We need to decrement the ref. count on the nfsnode representing 834 * the remote root. See comment in mountnfs(). The VFS unmount() 835 * has done vput on this vnode, otherwise we would get deadlock! 836 */ 837 vp = nmp->nm_vnode; 838 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 839 if (error != 0) 840 return error; 841 842 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 843 vput(vp); 844 return (EBUSY); 845 } 846 847 /* 848 * Must handshake with nqnfs_clientd() if it is active. 849 */ 850 nmp->nm_iflag |= NFSMNT_DISMINPROG; 851 while (nmp->nm_inprog != NULLVP) 852 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 853 error = vflush(mp, vp, flags); 854 if (error) { 855 vput(vp); 856 nmp->nm_iflag &= ~NFSMNT_DISMINPROG; 857 return (error); 858 } 859 860 /* 861 * We are now committed to the unmount; mark the mount structure 862 * as doomed so that any sleepers kicked awake by nfs_disconnect 863 * will go away cleanly. 864 */ 865 nmp->nm_iflag |= NFSMNT_DISMNT; 866 867 /* 868 * There are two reference counts to get rid of here 869 * (see comment in mountnfs()). 870 */ 871 vrele(vp); 872 vput(vp); 873 vgone(vp); 874 nfs_disconnect(nmp); 875 m_freem(nmp->nm_nam); 876 877 /* 878 * For NQNFS, let the server daemon free the nfsmount structure. 879 */ 880 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 881 free((caddr_t)nmp, M_NFSMNT); 882 return (0); 883 } 884 885 /* 886 * Return root of a filesystem 887 */ 888 int 889 nfs_root(mp, vpp) 890 struct mount *mp; 891 struct vnode **vpp; 892 { 893 struct vnode *vp; 894 struct nfsmount *nmp; 895 int error; 896 897 nmp = VFSTONFS(mp); 898 vp = nmp->nm_vnode; 899 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 900 if (error != 0) 901 return error; 902 if (vp->v_type == VNON) 903 vp->v_type = VDIR; 904 vp->v_flag = VROOT; 905 *vpp = vp; 906 return (0); 907 } 908 909 extern int syncprt; 910 911 /* 912 * Flush out the buffer cache 913 */ 914 /* ARGSUSED */ 915 int 916 nfs_sync(mp, waitfor, cred, p) 917 struct mount *mp; 918 int waitfor; 919 struct ucred *cred; 920 struct proc *p; 921 { 922 struct vnode *vp; 923 int error, allerror = 0; 924 925 /* 926 * Force stale buffer cache information to be flushed. 927 */ 928 loop: 929 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 930 /* 931 * If the vnode that we are about to sync is no longer 932 * associated with this mount point, start over. 933 */ 934 if (vp->v_mount != mp) 935 goto loop; 936 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 937 (LIST_EMPTY(&vp->v_dirtyblkhd) && 938 vp->v_uobj.uo_npages == 0)) 939 continue; 940 if (vget(vp, LK_EXCLUSIVE)) 941 goto loop; 942 error = VOP_FSYNC(vp, cred, 943 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p); 944 if (error) 945 allerror = error; 946 vput(vp); 947 } 948 return (allerror); 949 } 950 951 /* 952 * NFS flat namespace lookup. 953 * Currently unsupported. 954 */ 955 /* ARGSUSED */ 956 int 957 nfs_vget(mp, ino, vpp) 958 struct mount *mp; 959 ino_t ino; 960 struct vnode **vpp; 961 { 962 963 return (EOPNOTSUPP); 964 } 965 966 /* 967 * Do that sysctl thang... 968 */ 969 int 970 nfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 971 int *name; 972 u_int namelen; 973 void *oldp; 974 size_t *oldlenp; 975 void *newp; 976 size_t newlen; 977 struct proc *p; 978 { 979 int rv; 980 981 /* 982 * All names at this level are terminal. 983 */ 984 if(namelen > 1) 985 return ENOTDIR; /* overloaded */ 986 987 switch(name[0]) { 988 case NFS_NFSSTATS: 989 if(!oldp) { 990 *oldlenp = sizeof nfsstats; 991 return 0; 992 } 993 994 if(*oldlenp < sizeof nfsstats) { 995 *oldlenp = sizeof nfsstats; 996 return ENOMEM; 997 } 998 999 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 1000 if(rv) return rv; 1001 1002 if(newp && newlen != sizeof nfsstats) 1003 return EINVAL; 1004 1005 if(newp) { 1006 return copyin(newp, &nfsstats, sizeof nfsstats); 1007 } 1008 return 0; 1009 1010 case NFS_IOTHREADS: 1011 nfs_getset_niothreads(0); 1012 1013 rv = (sysctl_int(oldp, oldlenp, newp, newlen, 1014 &nfs_niothreads)); 1015 1016 if (newp) 1017 nfs_getset_niothreads(1); 1018 1019 return rv; 1020 1021 default: 1022 return EOPNOTSUPP; 1023 } 1024 } 1025 1026 1027 /* 1028 * At this point, this should never happen 1029 */ 1030 /* ARGSUSED */ 1031 int 1032 nfs_fhtovp(mp, fhp, vpp) 1033 struct mount *mp; 1034 struct fid *fhp; 1035 struct vnode **vpp; 1036 { 1037 1038 return (EINVAL); 1039 } 1040 1041 /* ARGSUSED */ 1042 int 1043 nfs_checkexp(mp, nam, exflagsp, credanonp) 1044 struct mount *mp; 1045 struct mbuf *nam; 1046 int *exflagsp; 1047 struct ucred **credanonp; 1048 { 1049 1050 return (EINVAL); 1051 } 1052 1053 /* 1054 * Vnode pointer to File handle, should never happen either 1055 */ 1056 /* ARGSUSED */ 1057 int 1058 nfs_vptofh(vp, fhp) 1059 struct vnode *vp; 1060 struct fid *fhp; 1061 { 1062 1063 return (EINVAL); 1064 } 1065 1066 /* 1067 * Vfs start routine, a no-op. 1068 */ 1069 /* ARGSUSED */ 1070 int 1071 nfs_start(mp, flags, p) 1072 struct mount *mp; 1073 int flags; 1074 struct proc *p; 1075 { 1076 1077 return (0); 1078 } 1079 1080 /* 1081 * Do operations associated with quotas, not supported 1082 */ 1083 /* ARGSUSED */ 1084 int 1085 nfs_quotactl(mp, cmd, uid, arg, p) 1086 struct mount *mp; 1087 int cmd; 1088 uid_t uid; 1089 caddr_t arg; 1090 struct proc *p; 1091 { 1092 1093 return (EOPNOTSUPP); 1094 } 1095
Indexes created Wed Sep 24 05:09:52 GMT 2025