1 /* $NetBSD: nfs_vfsops.c,v 1.198 2008/04/30 12:49:17 ad 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 1.198 2008/04/30 12:49:17 ad 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 #include <sys/timetc.h> 62 #include <sys/kauth.h> 63 64 #include <net/if.h> 65 #include <net/route.h> 66 #include <netinet/in.h> 67 68 #include <nfs/rpcv2.h> 69 #include <nfs/nfsproto.h> 70 #include <nfs/nfsnode.h> 71 #include <nfs/nfs.h> 72 #include <nfs/nfsmount.h> 73 #include <nfs/xdr_subs.h> 74 #include <nfs/nfsm_subs.h> 75 #include <nfs/nfsdiskless.h> 76 #include <nfs/nfs_var.h> 77 78 extern struct nfsstats nfsstats; 79 extern int nfs_ticks; 80 81 /* 82 * keep a count of the nfs mounts to generate ficticious drive names 83 * for the per drive stats. 84 */ 85 unsigned int nfs_mount_count = 0; 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 sizeof (struct nfs_args), 105 nfs_mount, 106 nfs_start, 107 nfs_unmount, 108 nfs_root, 109 (void *)eopnotsupp, /* vfs_quotactl */ 110 nfs_statvfs, 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_mountroot, 119 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 120 vfs_stdextattrctl, 121 (void *)eopnotsupp, /* vfs_suspendctl */ 122 genfs_renamelock_enter, 123 genfs_renamelock_exit, 124 (void *)eopnotsupp, 125 nfs_vnodeopv_descs, 126 0, 127 { NULL, NULL }, 128 }; 129 VFS_ATTACH(nfs_vfsops); 130 131 extern u_int32_t nfs_procids[NFS_NPROCS]; 132 extern u_int32_t nfs_prog, nfs_vers; 133 134 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 135 struct mount **, struct vnode **, struct lwp *)); 136 137 /* 138 * nfs statvfs call 139 */ 140 int 141 nfs_statvfs(mp, sbp) 142 struct mount *mp; 143 struct statvfs *sbp; 144 { 145 struct lwp *l = curlwp; 146 struct vnode *vp; 147 struct nfs_statfs *sfp; 148 char *cp; 149 u_int32_t *tl; 150 int32_t t1, t2; 151 char *bpos, *dpos, *cp2; 152 struct nfsmount *nmp = VFSTONFS(mp); 153 int error = 0, retattr; 154 #ifdef NFS_V2_ONLY 155 const int v3 = 0; 156 #else 157 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 158 #endif 159 struct mbuf *mreq, *mrep = NULL, *md, *mb; 160 kauth_cred_t cred; 161 u_quad_t tquad; 162 struct nfsnode *np; 163 164 #ifndef nolint 165 sfp = (struct nfs_statfs *)0; 166 #endif 167 vp = nmp->nm_vnode; 168 np = VTONFS(vp); 169 cred = kauth_cred_alloc(); 170 #ifndef NFS_V2_ONLY 171 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 172 (void)nfs_fsinfo(nmp, vp, cred, l); 173 #endif 174 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 175 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 176 nfsm_fhtom(np, v3); 177 nfsm_request(np, NFSPROC_FSSTAT, l, cred); 178 if (v3) 179 nfsm_postop_attr(vp, retattr, 0); 180 if (error) { 181 if (mrep != NULL) { 182 if (mrep->m_next != NULL) 183 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 184 m_freem(mrep); 185 } 186 goto nfsmout; 187 } 188 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 189 sbp->f_flag = nmp->nm_flag; 190 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 191 if (v3) { 192 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 193 tquad = fxdr_hyper(&sfp->sf_tbytes); 194 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 195 tquad = fxdr_hyper(&sfp->sf_fbytes); 196 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 197 tquad = fxdr_hyper(&sfp->sf_abytes); 198 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 199 sbp->f_bresvd = sbp->f_bfree - tquad; 200 sbp->f_bavail = tquad; 201 #ifdef COMPAT_20 202 /* Handle older NFS servers returning negative values */ 203 if ((quad_t)sbp->f_bavail < 0) 204 sbp->f_bavail = 0; 205 #endif 206 tquad = fxdr_hyper(&sfp->sf_tfiles); 207 sbp->f_files = tquad; 208 tquad = fxdr_hyper(&sfp->sf_ffiles); 209 sbp->f_ffree = tquad; 210 sbp->f_favail = tquad; 211 sbp->f_fresvd = 0; 212 sbp->f_namemax = MAXNAMLEN; 213 } else { 214 sbp->f_bsize = NFS_FABLKSIZE; 215 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 216 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 217 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 218 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 219 sbp->f_fresvd = 0; 220 sbp->f_files = 0; 221 sbp->f_ffree = 0; 222 sbp->f_favail = 0; 223 sbp->f_fresvd = 0; 224 sbp->f_namemax = MAXNAMLEN; 225 } 226 copy_statvfs_info(sbp, mp); 227 nfsm_reqdone; 228 kauth_cred_free(cred); 229 return (error); 230 } 231 232 #ifndef NFS_V2_ONLY 233 /* 234 * nfs version 3 fsinfo rpc call 235 */ 236 int 237 nfs_fsinfo(nmp, vp, cred, l) 238 struct nfsmount *nmp; 239 struct vnode *vp; 240 kauth_cred_t cred; 241 struct lwp *l; 242 { 243 struct nfsv3_fsinfo *fsp; 244 char *cp; 245 int32_t t1, t2; 246 u_int32_t *tl, pref, xmax; 247 char *bpos, *dpos, *cp2; 248 int error = 0, retattr; 249 struct mbuf *mreq, *mrep, *md, *mb; 250 u_int64_t maxfsize; 251 struct nfsnode *np = VTONFS(vp); 252 253 nfsstats.rpccnt[NFSPROC_FSINFO]++; 254 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 255 nfsm_fhtom(np, 1); 256 nfsm_request(np, NFSPROC_FSINFO, l, cred); 257 nfsm_postop_attr(vp, retattr, 0); 258 if (!error) { 259 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 260 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 261 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 262 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 263 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 264 ~(NFS_FABLKSIZE - 1); 265 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 266 if (xmax < nmp->nm_wsize && xmax > 0) { 267 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1); 268 if (nmp->nm_wsize == 0) 269 nmp->nm_wsize = xmax; 270 } 271 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 272 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 273 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 274 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 275 ~(NFS_FABLKSIZE - 1); 276 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 277 if (xmax < nmp->nm_rsize && xmax > 0) { 278 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1); 279 if (nmp->nm_rsize == 0) 280 nmp->nm_rsize = xmax; 281 } 282 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 283 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 284 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 285 ~(NFS_DIRFRAGSIZ - 1); 286 if (xmax < nmp->nm_readdirsize && xmax > 0) { 287 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1); 288 if (nmp->nm_readdirsize == 0) 289 nmp->nm_readdirsize = xmax; 290 } 291 /* XXX */ 292 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 293 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 294 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 295 nmp->nm_maxfilesize = maxfsize; 296 nmp->nm_mountp->mnt_fs_bshift = 297 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 298 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 299 } 300 nfsm_reqdone; 301 return (error); 302 } 303 #endif 304 305 /* 306 * Mount a remote root fs via. NFS. It goes like this: 307 * - Call nfs_boot_init() to fill in the nfs_diskless struct 308 * - build the rootfs mount point and call mountnfs() to do the rest. 309 */ 310 int 311 nfs_mountroot() 312 { 313 struct timespec ts; 314 struct nfs_diskless *nd; 315 struct vattr attr; 316 struct mount *mp; 317 struct vnode *vp; 318 struct lwp *l; 319 long n; 320 int error; 321 322 l = curlwp; /* XXX */ 323 324 if (device_class(root_device) != DV_IFNET) 325 return (ENODEV); 326 327 /* 328 * XXX time must be non-zero when we init the interface or else 329 * the arp code will wedge. [Fixed now in if_ether.c] 330 * However, the NFS attribute cache gives false "hits" when the 331 * current time < nfs_attrtimeo(nmp, np) so keep this in for now. 332 */ 333 if (time_second < NFS_MAXATTRTIMO) { 334 ts.tv_sec = NFS_MAXATTRTIMO; 335 ts.tv_nsec = 0; 336 tc_setclock(&ts); 337 } 338 339 /* 340 * Call nfs_boot_init() to fill in the nfs_diskless struct. 341 * Side effect: Finds and configures a network interface. 342 */ 343 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP); 344 error = nfs_boot_init(nd, l); 345 if (error) { 346 kmem_free(nd, sizeof(*nd)); 347 return (error); 348 } 349 350 /* 351 * Create the root mount point. 352 */ 353 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); 354 if (error) 355 goto out; 356 printf("root on %s\n", nd->nd_root.ndm_host); 357 358 /* 359 * Link it into the mount list. 360 */ 361 mutex_enter(&mountlist_lock); 362 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 363 mp->mnt_iflag |= IMNT_ONLIST; 364 mutex_exit(&mountlist_lock); 365 rootvp = vp; 366 mp->mnt_vnodecovered = NULLVP; 367 vfs_unbusy(mp, false, NULL); 368 369 /* Get root attributes (for the time). */ 370 error = VOP_GETATTR(vp, &attr, l->l_cred); 371 if (error) 372 panic("nfs_mountroot: getattr for root"); 373 n = attr.va_atime.tv_sec; 374 #ifdef DEBUG 375 printf("root time: 0x%lx\n", n); 376 #endif 377 setrootfstime(n); 378 379 out: 380 if (error) 381 nfs_boot_cleanup(nd, l); 382 kmem_free(nd, sizeof(*nd)); 383 return (error); 384 } 385 386 /* 387 * Internal version of mount system call for diskless setup. 388 * Separate function because we used to call it twice. 389 * (once for root and once for swap) 390 */ 391 static int 392 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, l) 393 struct nfs_dlmount *ndmntp; 394 const char *mntname; /* mount point name */ 395 struct mount **mpp; 396 struct vnode **vpp; 397 struct lwp *l; 398 { 399 struct mount *mp; 400 struct mbuf *m; 401 int error; 402 403 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp); 404 405 mp->mnt_op = &nfs_vfsops; 406 407 /* 408 * Historical practice expects NFS root file systems to 409 * be initially mounted r/w. 410 */ 411 mp->mnt_flag &= ~MNT_RDONLY; 412 413 /* Get mbuf for server sockaddr. */ 414 m = m_get(M_WAIT, MT_SONAME); 415 if (m == NULL) 416 panic("nfs_mountroot: mget soname for %s", mntname); 417 MCLAIM(m, &nfs_mowner); 418 memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr, 419 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 420 421 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 422 ndmntp->ndm_args.hostname, vpp, l); 423 if (error) { 424 vfs_unbusy(mp, false, NULL); 425 vfs_destroy(mp, false); 426 printf("nfs_mountroot: mount %s failed: %d\n", 427 mntname, error); 428 } else 429 *mpp = mp; 430 431 return (error); 432 } 433 434 void 435 nfs_decode_args(nmp, argp, l) 436 struct nfsmount *nmp; 437 struct nfs_args *argp; 438 struct lwp *l; 439 { 440 int s; 441 int adjsock; 442 int maxio; 443 444 s = splsoftnet(); 445 446 /* 447 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 448 * no sense in that context. 449 */ 450 if (argp->sotype == SOCK_STREAM) 451 argp->flags &= ~NFSMNT_NOCONN; 452 453 /* 454 * Cookie translation is not needed for v2, silently ignore it. 455 */ 456 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 457 NFSMNT_XLATECOOKIE) 458 argp->flags &= ~NFSMNT_XLATECOOKIE; 459 460 /* Re-bind if rsrvd port requested and wasn't on one */ 461 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 462 && (argp->flags & NFSMNT_RESVPORT); 463 /* Also re-bind if we're switching to/from a connected UDP socket */ 464 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 465 (argp->flags & NFSMNT_NOCONN)); 466 467 /* Update flags. */ 468 nmp->nm_flag = argp->flags; 469 splx(s); 470 471 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 472 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 473 if (nmp->nm_timeo < NFS_MINTIMEO) 474 nmp->nm_timeo = NFS_MINTIMEO; 475 else if (nmp->nm_timeo > NFS_MAXTIMEO) 476 nmp->nm_timeo = NFS_MAXTIMEO; 477 } 478 479 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 480 nmp->nm_retry = argp->retrans; 481 if (nmp->nm_retry > NFS_MAXREXMIT) 482 nmp->nm_retry = NFS_MAXREXMIT; 483 } 484 485 #ifndef NFS_V2_ONLY 486 if (argp->flags & NFSMNT_NFSV3) { 487 if (argp->sotype == SOCK_DGRAM) 488 maxio = NFS_MAXDGRAMDATA; 489 else 490 maxio = NFS_MAXDATA; 491 } else 492 #endif 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 minimum blocksize */ 526 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 527 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 528 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 529 /* Bigger than buffer size makes no sense */ 530 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 531 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 532 } else if (argp->flags & NFSMNT_RSIZE) 533 nmp->nm_readdirsize = nmp->nm_rsize; 534 535 if (nmp->nm_readdirsize > maxio) 536 nmp->nm_readdirsize = maxio; 537 538 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 539 argp->maxgrouplist <= NFS_MAXGRPS) 540 nmp->nm_numgrps = argp->maxgrouplist; 541 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 542 argp->readahead <= NFS_MAXRAHEAD) 543 nmp->nm_readahead = argp->readahead; 544 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 545 argp->deadthresh <= NFS_NEVERDEAD) 546 nmp->nm_deadthresh = argp->deadthresh; 547 548 adjsock |= ((nmp->nm_sotype != argp->sotype) || 549 (nmp->nm_soproto != argp->proto)); 550 nmp->nm_sotype = argp->sotype; 551 nmp->nm_soproto = argp->proto; 552 553 if (nmp->nm_so && adjsock) { 554 nfs_safedisconnect(nmp); 555 if (nmp->nm_sotype == SOCK_DGRAM) 556 while (nfs_connect(nmp, (struct nfsreq *)0, l)) { 557 printf("nfs_args: retrying connect\n"); 558 kpause("nfscn3", false, hz, NULL); 559 } 560 } 561 } 562 563 /* 564 * VFS Operations. 565 * 566 * mount system call 567 * It seems a bit dumb to copyinstr() the host and path here and then 568 * memcpy() them in mountnfs(), but I wanted to detect errors before 569 * doing the sockargs() call because sockargs() allocates an mbuf and 570 * an error after that means that I have to release the mbuf. 571 */ 572 /* ARGSUSED */ 573 int 574 nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 575 { 576 struct lwp *l = curlwp; 577 int error; 578 struct nfs_args *args = data; 579 struct mbuf *nam; 580 struct nfsmount *nmp = VFSTONFS(mp); 581 struct sockaddr *sa; 582 struct vnode *vp; 583 char *pth, *hst; 584 struct proc *p; 585 size_t len; 586 u_char *nfh; 587 588 if (*data_len < sizeof *args) 589 return EINVAL; 590 591 p = l->l_proc; 592 if (mp->mnt_flag & MNT_GETARGS) { 593 594 if (nmp == NULL) 595 return (EIO); 596 if (args->addr != NULL) { 597 sa = mtod(nmp->nm_nam, struct sockaddr *); 598 error = copyout(sa, args->addr, sa->sa_len); 599 if (error) 600 return (error); 601 args->addrlen = sa->sa_len; 602 } else 603 args->addrlen = 0; 604 605 args->version = NFS_ARGSVERSION; 606 args->sotype = nmp->nm_sotype; 607 args->proto = nmp->nm_soproto; 608 args->fh = NULL; 609 args->fhsize = 0; 610 args->flags = nmp->nm_flag; 611 args->wsize = nmp->nm_wsize; 612 args->rsize = nmp->nm_rsize; 613 args->readdirsize = nmp->nm_readdirsize; 614 args->timeo = nmp->nm_timeo; 615 args->retrans = nmp->nm_retry; 616 args->maxgrouplist = nmp->nm_numgrps; 617 args->readahead = nmp->nm_readahead; 618 args->leaseterm = 0; /* dummy */ 619 args->deadthresh = nmp->nm_deadthresh; 620 args->hostname = NULL; 621 *data_len = sizeof *args; 622 return 0; 623 } 624 625 if (args->version != NFS_ARGSVERSION) 626 return (EPROGMISMATCH); 627 if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB)) 628 return (EPROGUNAVAIL); 629 #ifdef NFS_V2_ONLY 630 if (args->flags & NFSMNT_NFSV3) 631 return (EPROGMISMATCH); 632 #endif 633 if (mp->mnt_flag & MNT_UPDATE) { 634 if (nmp == NULL) 635 return (EIO); 636 /* 637 * When doing an update, we can't change from or to 638 * v3, or change cookie translation 639 */ 640 args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) | 641 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)); 642 nfs_decode_args(nmp, args, l); 643 return (0); 644 } 645 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 646 return (EINVAL); 647 MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK); 648 error = copyin(args->fh, nfh, args->fhsize); 649 if (error) 650 goto free_nfh; 651 MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK); 652 error = copyinstr(path, pth, MNAMELEN - 1, &len); 653 if (error) 654 goto free_pth; 655 memset(&pth[len], 0, MNAMELEN - len); 656 MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK); 657 error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len); 658 if (error) 659 goto free_hst; 660 memset(&hst[len], 0, MNAMELEN - len); 661 /* sockargs() call must be after above copyin() calls */ 662 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME); 663 if (error) 664 goto free_hst; 665 MCLAIM(nam, &nfs_mowner); 666 args->fh = nfh; 667 error = mountnfs(args, mp, nam, pth, hst, &vp, l); 668 669 free_hst: 670 FREE(hst, M_TEMP); 671 free_pth: 672 FREE(pth, M_TEMP); 673 free_nfh: 674 FREE(nfh, M_TEMP); 675 676 return (error); 677 } 678 679 /* 680 * Common code for mount and mountroot 681 */ 682 int 683 mountnfs(argp, mp, nam, pth, hst, vpp, l) 684 struct nfs_args *argp; 685 struct mount *mp; 686 struct mbuf *nam; 687 const char *pth, *hst; 688 struct vnode **vpp; 689 struct lwp *l; 690 { 691 struct nfsmount *nmp; 692 struct nfsnode *np; 693 int error; 694 struct vattr *attrs; 695 kauth_cred_t cr; 696 char iosname[IOSTATNAMELEN]; 697 698 /* 699 * If the number of nfs iothreads to use has never 700 * been set, create a reasonable number of them. 701 */ 702 703 if (nfs_niothreads < 0) { 704 nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS); 705 } 706 707 if (mp->mnt_flag & MNT_UPDATE) { 708 nmp = VFSTONFS(mp); 709 /* update paths, file handles, etc, here XXX */ 710 m_freem(nam); 711 return (0); 712 } else { 713 nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP); 714 mp->mnt_data = nmp; 715 TAILQ_INIT(&nmp->nm_uidlruhead); 716 TAILQ_INIT(&nmp->nm_bufq); 717 rw_init(&nmp->nm_writeverflock); 718 mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE); 719 cv_init(&nmp->nm_rcvcv, "nfsrcv"); 720 cv_init(&nmp->nm_sndcv, "nfssnd"); 721 cv_init(&nmp->nm_aiocv, "nfsaio"); 722 cv_init(&nmp->nm_disconcv, "nfsdis"); 723 } 724 vfs_getnewfsid(mp); 725 nmp->nm_mountp = mp; 726 727 #ifndef NFS_V2_ONLY 728 if ((argp->flags & NFSMNT_NFSV3) == 0) 729 #endif 730 { 731 if (argp->fhsize != NFSX_V2FH) { 732 return EINVAL; 733 } 734 } 735 736 /* 737 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 738 * will overwrite this. 739 */ 740 nmp->nm_maxfilesize = 0xffffffffLL; 741 742 nmp->nm_timeo = NFS_TIMEO; 743 nmp->nm_retry = NFS_RETRANS; 744 nmp->nm_wsize = NFS_WSIZE; 745 nmp->nm_rsize = NFS_RSIZE; 746 nmp->nm_readdirsize = NFS_READDIRSIZE; 747 nmp->nm_numgrps = NFS_MAXGRPS; 748 nmp->nm_readahead = NFS_DEFRAHEAD; 749 nmp->nm_deadthresh = NFS_DEFDEADTHRESH; 750 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, 751 mp->mnt_op->vfs_name, mp, l); 752 if (error) 753 goto bad; 754 nmp->nm_nam = nam; 755 756 /* Set up the sockets and per-host congestion */ 757 nmp->nm_sotype = argp->sotype; 758 nmp->nm_soproto = argp->proto; 759 760 nfs_decode_args(nmp, argp, l); 761 762 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 763 mp->mnt_dev_bshift = DEV_BSHIFT; 764 765 /* 766 * For Connection based sockets (TCP,...) defer the connect until 767 * the first request, in case the server is not responding. 768 */ 769 if (nmp->nm_sotype == SOCK_DGRAM && 770 (error = nfs_connect(nmp, (struct nfsreq *)0, l))) 771 goto bad; 772 773 /* 774 * This is silly, but it has to be set so that vinifod() works. 775 * We do not want to do an nfs_statvfs() here since we can get 776 * stuck on a dead server and we are holding a lock on the mount 777 * point. 778 */ 779 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 780 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 781 if (error) 782 goto bad; 783 *vpp = NFSTOV(np); 784 MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK); 785 VOP_GETATTR(*vpp, attrs, l->l_cred); 786 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 787 cr = kauth_cred_alloc(); 788 kauth_cred_setuid(cr, attrs->va_uid); 789 kauth_cred_seteuid(cr, attrs->va_uid); 790 kauth_cred_setsvuid(cr, attrs->va_uid); 791 kauth_cred_setgid(cr, attrs->va_gid); 792 kauth_cred_setegid(cr, attrs->va_gid); 793 kauth_cred_setsvgid(cr, attrs->va_gid); 794 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, l, cr); 795 kauth_cred_free(cr); 796 } 797 FREE(attrs, M_TEMP); 798 799 /* 800 * A reference count is needed on the nfsnode representing the 801 * remote root. If this object is not persistent, then backward 802 * traversals of the mount point (i.e. "..") will not work if 803 * the nfsnode gets flushed out of the cache. Ufs does not have 804 * this problem, because one can identify root inodes by their 805 * number == ROOTINO (2). So, just unlock, but no rele. 806 */ 807 808 nmp->nm_vnode = *vpp; 809 VOP_UNLOCK(*vpp, 0); 810 811 snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++); 812 nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname); 813 814 return (0); 815 bad: 816 nfs_disconnect(nmp); 817 rw_destroy(&nmp->nm_writeverflock); 818 mutex_destroy(&nmp->nm_lock); 819 cv_destroy(&nmp->nm_rcvcv); 820 cv_destroy(&nmp->nm_sndcv); 821 cv_destroy(&nmp->nm_aiocv); 822 cv_destroy(&nmp->nm_disconcv); 823 kmem_free(nmp, sizeof(*nmp)); 824 m_freem(nam); 825 return (error); 826 } 827 828 /* 829 * unmount system call 830 */ 831 int 832 nfs_unmount(struct mount *mp, int mntflags) 833 { 834 struct nfsmount *nmp; 835 struct vnode *vp; 836 int error, flags = 0; 837 838 if (mntflags & MNT_FORCE) 839 flags |= FORCECLOSE; 840 nmp = VFSTONFS(mp); 841 /* 842 * Goes something like this.. 843 * - Check for activity on the root vnode (other than ourselves). 844 * - Call vflush() to clear out vnodes for this file system, 845 * except for the root vnode. 846 * - Decrement reference on the vnode representing remote root. 847 * - Close the socket 848 * - Free up the data structures 849 */ 850 /* 851 * We need to decrement the ref. count on the nfsnode representing 852 * the remote root. See comment in mountnfs(). The VFS unmount() 853 * has done vput on this vnode, otherwise we would get deadlock! 854 */ 855 vp = nmp->nm_vnode; 856 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 857 if (error != 0) 858 return error; 859 860 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 861 vput(vp); 862 return (EBUSY); 863 } 864 865 error = vflush(mp, vp, flags); 866 if (error) { 867 vput(vp); 868 return (error); 869 } 870 871 /* 872 * We are now committed to the unmount; mark the mount structure 873 * as doomed so that any sleepers kicked awake by nfs_disconnect 874 * will go away cleanly. 875 */ 876 nmp->nm_iflag |= NFSMNT_DISMNT; 877 878 /* 879 * Clean up the stats... note that we carefully avoid decrementing 880 * nfs_mount_count here for good reason - we may not be unmounting 881 * the last thing mounted. 882 */ 883 iostat_free(nmp->nm_stats); 884 885 /* 886 * There are two reference counts to get rid of here 887 * (see comment in mountnfs()). 888 */ 889 vput(vp); 890 vgone(vp); 891 nfs_disconnect(nmp); 892 m_freem(nmp->nm_nam); 893 894 rw_destroy(&nmp->nm_writeverflock); 895 mutex_destroy(&nmp->nm_lock); 896 cv_destroy(&nmp->nm_rcvcv); 897 cv_destroy(&nmp->nm_sndcv); 898 cv_destroy(&nmp->nm_aiocv); 899 cv_destroy(&nmp->nm_disconcv); 900 kmem_free(nmp, sizeof(*nmp)); 901 return (0); 902 } 903 904 /* 905 * Return root of a filesystem 906 */ 907 int 908 nfs_root(mp, vpp) 909 struct mount *mp; 910 struct vnode **vpp; 911 { 912 struct vnode *vp; 913 struct nfsmount *nmp; 914 int error; 915 916 nmp = VFSTONFS(mp); 917 vp = nmp->nm_vnode; 918 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 919 if (error != 0) 920 return error; 921 if (vp->v_type == VNON) 922 vp->v_type = VDIR; 923 vp->v_vflag = VV_ROOT; 924 *vpp = vp; 925 return (0); 926 } 927 928 extern int syncprt; 929 930 /* 931 * Flush out the buffer cache 932 */ 933 /* ARGSUSED */ 934 int 935 nfs_sync(mp, waitfor, cred) 936 struct mount *mp; 937 int waitfor; 938 kauth_cred_t cred; 939 { 940 struct vnode *vp, *mvp; 941 int error, allerror = 0; 942 943 /* 944 * Force stale buffer cache information to be flushed. 945 */ 946 if ((mvp = vnalloc(mp)) == NULL) 947 return (ENOMEM); 948 loop: 949 /* 950 * NOTE: not using the TAILQ_FOREACH here since in this loop vgone() 951 * and vclean() can be called indirectly 952 */ 953 mutex_enter(&mntvnode_lock); 954 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 955 vmark(mvp, vp); 956 if (vp->v_mount != mp || vismarker(vp)) 957 continue; 958 mutex_enter(&vp->v_interlock); 959 /* XXX MNT_LAZY cannot be right? */ 960 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 961 (LIST_EMPTY(&vp->v_dirtyblkhd) && 962 UVM_OBJ_IS_CLEAN(&vp->v_uobj))) { 963 mutex_exit(&vp->v_interlock); 964 continue; 965 } 966 mutex_exit(&mntvnode_lock); 967 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) { 968 (void)vunmark(mvp); 969 goto loop; 970 } 971 error = VOP_FSYNC(vp, cred, 972 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); 973 if (error) 974 allerror = error; 975 vput(vp); 976 mutex_enter(&mntvnode_lock); 977 } 978 mutex_exit(&mntvnode_lock); 979 vnfree(mvp); 980 return (allerror); 981 } 982 983 /* 984 * NFS flat namespace lookup. 985 * Currently unsupported. 986 */ 987 /* ARGSUSED */ 988 int 989 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 990 { 991 992 return (EOPNOTSUPP); 993 } 994 995 /* 996 * Do that sysctl thang... 997 */ 998 static int 999 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 1000 { 1001 struct sysctlnode node; 1002 int val; 1003 int error; 1004 1005 val = nfs_niothreads; 1006 node = *rnode; 1007 node.sysctl_data = &val; 1008 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1009 if (error || newp == NULL) 1010 return error; 1011 1012 return nfs_set_niothreads(val); 1013 } 1014 1015 SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup") 1016 { 1017 1018 sysctl_createv(clog, 0, NULL, NULL, 1019 CTLFLAG_PERMANENT, 1020 CTLTYPE_NODE, "vfs", NULL, 1021 NULL, 0, NULL, 0, 1022 CTL_VFS, CTL_EOL); 1023 sysctl_createv(clog, 0, NULL, NULL, 1024 CTLFLAG_PERMANENT, 1025 CTLTYPE_NODE, "nfs", 1026 SYSCTL_DESCR("NFS vfs options"), 1027 NULL, 0, NULL, 0, 1028 CTL_VFS, 2, CTL_EOL); 1029 /* 1030 * XXX the "2" above could be dynamic, thereby eliminating one 1031 * more instance of the "number to vfs" mapping problem, but 1032 * "2" is the order as taken from sys/mount.h 1033 */ 1034 1035 sysctl_createv(clog, 0, NULL, NULL, 1036 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1037 CTLTYPE_STRUCT, "nfsstats", 1038 SYSCTL_DESCR("NFS operation statistics"), 1039 NULL, 0, &nfsstats, sizeof(nfsstats), 1040 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1041 sysctl_createv(clog, 0, NULL, NULL, 1042 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1043 CTLTYPE_INT, "iothreads", 1044 SYSCTL_DESCR("Number of NFS client processes desired"), 1045 sysctl_vfs_nfs_iothreads, 0, NULL, 0, 1046 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1047 } 1048 1049 /* ARGSUSED */ 1050 int 1051 nfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 1052 { 1053 size_t fidsize; 1054 size_t fhsize; 1055 struct nfsnode *np; 1056 int error; 1057 struct vattr va; 1058 1059 fidsize = fid->fid_len; 1060 if (fidsize < sizeof(*fid)) { 1061 return EINVAL; 1062 } 1063 fhsize = fidsize - sizeof(*fid); 1064 if ((fhsize % NFSX_UNSIGNED) != 0) { 1065 return EINVAL; 1066 } 1067 if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) { 1068 if (fhsize > NFSX_V3FHMAX || fhsize == 0) { 1069 return EINVAL; 1070 } 1071 } else { 1072 if (fhsize != NFSX_V2FH) { 1073 return EINVAL; 1074 } 1075 } 1076 error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np); 1077 if (error) { 1078 return error; 1079 } 1080 *vpp = NFSTOV(np); 1081 error = VOP_GETATTR(*vpp, &va, kauth_cred_get()); 1082 if (error != 0) { 1083 vput(*vpp); 1084 } 1085 return error; 1086 } 1087 1088 /* ARGSUSED */ 1089 int 1090 nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize) 1091 { 1092 struct nfsnode *np; 1093 struct fid *fid; 1094 size_t fidsize; 1095 int error = 0; 1096 1097 np = VTONFS(vp); 1098 fidsize = sizeof(*fid) + np->n_fhsize; 1099 if (*bufsize < fidsize) { 1100 error = E2BIG; 1101 } 1102 *bufsize = fidsize; 1103 if (error == 0) { 1104 struct fid fid_store; 1105 1106 fid = &fid_store; 1107 memset(fid, 0, sizeof(*fid)); 1108 fid->fid_len = fidsize; 1109 memcpy(buf, fid, sizeof(*fid)); 1110 memcpy(buf->fid_data, np->n_fhp, np->n_fhsize); 1111 } 1112 return error; 1113 } 1114 1115 /* 1116 * Vfs start routine, a no-op. 1117 */ 1118 /* ARGSUSED */ 1119 int 1120 nfs_start(struct mount *mp, int flags) 1121 { 1122 1123 return (0); 1124 } 1125