1 /* $NetBSD: nfs_vfsops.c,v 1.206 2008/12/17 20:51:38 cegger 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 1.206 2008/12/17 20:51:38 cegger Exp $"); 39 40 #if defined(_KERNEL_OPT) 41 #include "opt_nfs.h" 42 #endif 43 44 #include <sys/param.h> 45 #include <sys/ioctl.h> 46 #include <sys/signal.h> 47 #include <sys/proc.h> 48 #include <sys/namei.h> 49 #include <sys/device.h> 50 #include <sys/vnode.h> 51 #include <sys/kernel.h> 52 #include <sys/mount.h> 53 #include <sys/buf.h> 54 #include <sys/mbuf.h> 55 #include <sys/dirent.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/sysctl.h> 59 #include <sys/systm.h> 60 #include <sys/timetc.h> 61 #include <sys/kauth.h> 62 #include <sys/module.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 MODULE(MODULE_CLASS_VFS, nfs, NULL); 79 80 extern struct nfsstats nfsstats; 81 extern int nfs_ticks; 82 83 /* 84 * keep a count of the nfs mounts to generate ficticious drive names 85 * for the per drive stats. 86 */ 87 unsigned int nfs_mount_count = 0; 88 89 /* 90 * nfs vfs operations. 91 */ 92 93 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 94 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 95 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 96 97 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 98 &nfsv2_vnodeop_opv_desc, 99 &spec_nfsv2nodeop_opv_desc, 100 &fifo_nfsv2nodeop_opv_desc, 101 NULL, 102 }; 103 104 struct vfsops nfs_vfsops = { 105 MOUNT_NFS, 106 sizeof (struct nfs_args), 107 nfs_mount, 108 nfs_start, 109 nfs_unmount, 110 nfs_root, 111 (void *)eopnotsupp, /* vfs_quotactl */ 112 nfs_statvfs, 113 nfs_sync, 114 nfs_vget, 115 nfs_fhtovp, 116 nfs_vptofh, 117 nfs_vfs_init, 118 NULL, 119 nfs_vfs_done, 120 nfs_mountroot, 121 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 122 vfs_stdextattrctl, 123 (void *)eopnotsupp, /* vfs_suspendctl */ 124 genfs_renamelock_enter, 125 genfs_renamelock_exit, 126 (void *)eopnotsupp, 127 nfs_vnodeopv_descs, 128 0, 129 { NULL, NULL }, 130 }; 131 132 extern u_int32_t nfs_procids[NFS_NPROCS]; 133 extern u_int32_t nfs_prog, nfs_vers; 134 static struct sysctllog *nfs_clog; 135 136 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 137 struct mount **, struct vnode **, struct lwp *)); 138 static void nfs_sysctl_init(void); 139 static void nfs_sysctl_fini(void); 140 141 static int 142 nfs_modcmd(modcmd_t cmd, void *arg) 143 { 144 int error; 145 146 switch (cmd) { 147 case MODULE_CMD_INIT: 148 error = vfs_attach(&nfs_vfsops); 149 if (error == 0) { 150 nfs_sysctl_init(); 151 } 152 return error; 153 case MODULE_CMD_FINI: 154 error = vfs_detach(&nfs_vfsops); 155 if (error == 0) { 156 nfs_sysctl_fini(); 157 } 158 return error; 159 default: 160 return ENOTTY; 161 } 162 } 163 164 /* 165 * nfs statvfs call 166 */ 167 int 168 nfs_statvfs(mp, sbp) 169 struct mount *mp; 170 struct statvfs *sbp; 171 { 172 struct lwp *l = curlwp; 173 struct vnode *vp; 174 struct nfs_statfs *sfp; 175 char *cp; 176 u_int32_t *tl; 177 int32_t t1, t2; 178 char *bpos, *dpos, *cp2; 179 struct nfsmount *nmp = VFSTONFS(mp); 180 int error = 0, retattr; 181 #ifdef NFS_V2_ONLY 182 const int v3 = 0; 183 #else 184 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 185 #endif 186 struct mbuf *mreq, *mrep = NULL, *md, *mb; 187 kauth_cred_t cred; 188 u_quad_t tquad; 189 struct nfsnode *np; 190 191 #ifndef nolint 192 sfp = (struct nfs_statfs *)0; 193 #endif 194 vp = nmp->nm_vnode; 195 np = VTONFS(vp); 196 cred = kauth_cred_alloc(); 197 #ifndef NFS_V2_ONLY 198 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 199 (void)nfs_fsinfo(nmp, vp, cred, l); 200 #endif 201 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 202 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 203 nfsm_fhtom(np, v3); 204 nfsm_request(np, NFSPROC_FSSTAT, l, cred); 205 if (v3) 206 nfsm_postop_attr(vp, retattr, 0); 207 if (error) { 208 if (mrep != NULL) { 209 if (mrep->m_next != NULL) 210 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 211 m_freem(mrep); 212 } 213 goto nfsmout; 214 } 215 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 216 sbp->f_flag = nmp->nm_flag; 217 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 218 if (v3) { 219 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 220 tquad = fxdr_hyper(&sfp->sf_tbytes); 221 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 222 tquad = fxdr_hyper(&sfp->sf_fbytes); 223 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 224 tquad = fxdr_hyper(&sfp->sf_abytes); 225 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 226 sbp->f_bresvd = sbp->f_bfree - tquad; 227 sbp->f_bavail = tquad; 228 /* Handle older NFS servers returning negative values */ 229 if ((quad_t)sbp->f_bavail < 0) 230 sbp->f_bavail = 0; 231 tquad = fxdr_hyper(&sfp->sf_tfiles); 232 sbp->f_files = tquad; 233 tquad = fxdr_hyper(&sfp->sf_ffiles); 234 sbp->f_ffree = tquad; 235 sbp->f_favail = tquad; 236 sbp->f_fresvd = 0; 237 sbp->f_namemax = MAXNAMLEN; 238 } else { 239 sbp->f_bsize = NFS_FABLKSIZE; 240 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 241 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 242 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 243 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 244 sbp->f_fresvd = 0; 245 sbp->f_files = 0; 246 sbp->f_ffree = 0; 247 sbp->f_favail = 0; 248 sbp->f_fresvd = 0; 249 sbp->f_namemax = MAXNAMLEN; 250 } 251 copy_statvfs_info(sbp, mp); 252 nfsm_reqdone; 253 kauth_cred_free(cred); 254 return (error); 255 } 256 257 #ifndef NFS_V2_ONLY 258 /* 259 * nfs version 3 fsinfo rpc call 260 */ 261 int 262 nfs_fsinfo(nmp, vp, cred, l) 263 struct nfsmount *nmp; 264 struct vnode *vp; 265 kauth_cred_t cred; 266 struct lwp *l; 267 { 268 struct nfsv3_fsinfo *fsp; 269 char *cp; 270 int32_t t1, t2; 271 u_int32_t *tl, pref, xmax; 272 char *bpos, *dpos, *cp2; 273 int error = 0, retattr; 274 struct mbuf *mreq, *mrep, *md, *mb; 275 u_int64_t maxfsize; 276 struct nfsnode *np = VTONFS(vp); 277 278 nfsstats.rpccnt[NFSPROC_FSINFO]++; 279 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 280 nfsm_fhtom(np, 1); 281 nfsm_request(np, NFSPROC_FSINFO, l, cred); 282 nfsm_postop_attr(vp, retattr, 0); 283 if (!error) { 284 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 285 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 286 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 287 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 288 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 289 ~(NFS_FABLKSIZE - 1); 290 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 291 if (xmax < nmp->nm_wsize && xmax > 0) { 292 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1); 293 if (nmp->nm_wsize == 0) 294 nmp->nm_wsize = xmax; 295 } 296 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 297 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 298 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 299 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 300 ~(NFS_FABLKSIZE - 1); 301 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 302 if (xmax < nmp->nm_rsize && xmax > 0) { 303 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1); 304 if (nmp->nm_rsize == 0) 305 nmp->nm_rsize = xmax; 306 } 307 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 308 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 309 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 310 ~(NFS_DIRFRAGSIZ - 1); 311 if (xmax < nmp->nm_readdirsize && xmax > 0) { 312 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1); 313 if (nmp->nm_readdirsize == 0) 314 nmp->nm_readdirsize = xmax; 315 } 316 /* XXX */ 317 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 318 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 319 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 320 nmp->nm_maxfilesize = maxfsize; 321 nmp->nm_mountp->mnt_fs_bshift = 322 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 323 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 324 } 325 nfsm_reqdone; 326 return (error); 327 } 328 #endif 329 330 /* 331 * Mount a remote root fs via. NFS. It goes like this: 332 * - Call nfs_boot_init() to fill in the nfs_diskless struct 333 * - build the rootfs mount point and call mountnfs() to do the rest. 334 */ 335 int 336 nfs_mountroot() 337 { 338 struct timespec ts; 339 struct nfs_diskless *nd; 340 struct vattr attr; 341 struct mount *mp; 342 struct vnode *vp; 343 struct lwp *l; 344 long n; 345 int error; 346 347 l = curlwp; /* XXX */ 348 349 if (device_class(root_device) != DV_IFNET) 350 return (ENODEV); 351 352 /* 353 * XXX time must be non-zero when we init the interface or else 354 * the arp code will wedge. [Fixed now in if_ether.c] 355 * However, the NFS attribute cache gives false "hits" when the 356 * current time < nfs_attrtimeo(nmp, np) so keep this in for now. 357 */ 358 if (time_second < NFS_MAXATTRTIMO) { 359 ts.tv_sec = NFS_MAXATTRTIMO; 360 ts.tv_nsec = 0; 361 tc_setclock(&ts); 362 } 363 364 /* 365 * Call nfs_boot_init() to fill in the nfs_diskless struct. 366 * Side effect: Finds and configures a network interface. 367 */ 368 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP); 369 error = nfs_boot_init(nd, l); 370 if (error) { 371 kmem_free(nd, sizeof(*nd)); 372 return (error); 373 } 374 375 /* 376 * Create the root mount point. 377 */ 378 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); 379 if (error) 380 goto out; 381 printf("root on %s\n", nd->nd_root.ndm_host); 382 383 /* 384 * Link it into the mount list. 385 */ 386 mutex_enter(&mountlist_lock); 387 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 388 mutex_exit(&mountlist_lock); 389 rootvp = vp; 390 mp->mnt_vnodecovered = NULLVP; 391 vfs_unbusy(mp, false, NULL); 392 393 /* Get root attributes (for the time). */ 394 error = VOP_GETATTR(vp, &attr, l->l_cred); 395 if (error) 396 panic("nfs_mountroot: getattr for root"); 397 n = attr.va_atime.tv_sec; 398 #ifdef DEBUG 399 printf("root time: 0x%lx\n", n); 400 #endif 401 setrootfstime(n); 402 403 out: 404 if (error) 405 nfs_boot_cleanup(nd, l); 406 kmem_free(nd, sizeof(*nd)); 407 return (error); 408 } 409 410 /* 411 * Internal version of mount system call for diskless setup. 412 * Separate function because we used to call it twice. 413 * (once for root and once for swap) 414 */ 415 static int 416 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, l) 417 struct nfs_dlmount *ndmntp; 418 const char *mntname; /* mount point name */ 419 struct mount **mpp; 420 struct vnode **vpp; 421 struct lwp *l; 422 { 423 struct mount *mp; 424 struct mbuf *m; 425 int error; 426 427 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp); 428 429 mp->mnt_op = &nfs_vfsops; 430 431 /* 432 * Historical practice expects NFS root file systems to 433 * be initially mounted r/w. 434 */ 435 mp->mnt_flag &= ~MNT_RDONLY; 436 437 /* Get mbuf for server sockaddr. */ 438 m = m_get(M_WAIT, MT_SONAME); 439 if (m == NULL) 440 panic("nfs_mountroot: mget soname for %s", mntname); 441 MCLAIM(m, &nfs_mowner); 442 memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr, 443 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 444 445 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 446 ndmntp->ndm_args.hostname, vpp, l); 447 if (error) { 448 vfs_unbusy(mp, false, NULL); 449 vfs_destroy(mp); 450 printf("nfs_mountroot: mount %s failed: %d\n", 451 mntname, error); 452 } else 453 *mpp = mp; 454 455 return (error); 456 } 457 458 void 459 nfs_decode_args(nmp, argp, l) 460 struct nfsmount *nmp; 461 struct nfs_args *argp; 462 struct lwp *l; 463 { 464 int s; 465 int adjsock; 466 int maxio; 467 468 s = splsoftnet(); 469 470 /* 471 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 472 * no sense in that context. 473 */ 474 if (argp->sotype == SOCK_STREAM) 475 argp->flags &= ~NFSMNT_NOCONN; 476 477 /* 478 * Cookie translation is not needed for v2, silently ignore it. 479 */ 480 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 481 NFSMNT_XLATECOOKIE) 482 argp->flags &= ~NFSMNT_XLATECOOKIE; 483 484 /* Re-bind if rsrvd port requested and wasn't on one */ 485 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 486 && (argp->flags & NFSMNT_RESVPORT); 487 /* Also re-bind if we're switching to/from a connected UDP socket */ 488 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 489 (argp->flags & NFSMNT_NOCONN)); 490 491 /* Update flags. */ 492 nmp->nm_flag = argp->flags; 493 splx(s); 494 495 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 496 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 497 if (nmp->nm_timeo < NFS_MINTIMEO) 498 nmp->nm_timeo = NFS_MINTIMEO; 499 else if (nmp->nm_timeo > NFS_MAXTIMEO) 500 nmp->nm_timeo = NFS_MAXTIMEO; 501 } 502 503 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 504 nmp->nm_retry = argp->retrans; 505 if (nmp->nm_retry > NFS_MAXREXMIT) 506 nmp->nm_retry = NFS_MAXREXMIT; 507 } 508 509 #ifndef NFS_V2_ONLY 510 if (argp->flags & NFSMNT_NFSV3) { 511 if (argp->sotype == SOCK_DGRAM) 512 maxio = NFS_MAXDGRAMDATA; 513 else 514 maxio = NFS_MAXDATA; 515 } else 516 #endif 517 maxio = NFS_V2MAXDATA; 518 519 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 520 int osize = nmp->nm_wsize; 521 nmp->nm_wsize = argp->wsize; 522 /* Round down to multiple of blocksize */ 523 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 524 if (nmp->nm_wsize <= 0) 525 nmp->nm_wsize = NFS_FABLKSIZE; 526 adjsock |= (nmp->nm_wsize != osize); 527 } 528 if (nmp->nm_wsize > maxio) 529 nmp->nm_wsize = maxio; 530 if (nmp->nm_wsize > MAXBSIZE) 531 nmp->nm_wsize = MAXBSIZE; 532 533 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 534 int osize = nmp->nm_rsize; 535 nmp->nm_rsize = argp->rsize; 536 /* Round down to multiple of blocksize */ 537 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 538 if (nmp->nm_rsize <= 0) 539 nmp->nm_rsize = NFS_FABLKSIZE; 540 adjsock |= (nmp->nm_rsize != osize); 541 } 542 if (nmp->nm_rsize > maxio) 543 nmp->nm_rsize = maxio; 544 if (nmp->nm_rsize > MAXBSIZE) 545 nmp->nm_rsize = MAXBSIZE; 546 547 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 548 nmp->nm_readdirsize = argp->readdirsize; 549 /* Round down to multiple of minimum blocksize */ 550 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 551 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 552 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 553 /* Bigger than buffer size makes no sense */ 554 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 555 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 556 } else if (argp->flags & NFSMNT_RSIZE) 557 nmp->nm_readdirsize = nmp->nm_rsize; 558 559 if (nmp->nm_readdirsize > maxio) 560 nmp->nm_readdirsize = maxio; 561 562 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 563 argp->maxgrouplist <= NFS_MAXGRPS) 564 nmp->nm_numgrps = argp->maxgrouplist; 565 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 566 argp->readahead <= NFS_MAXRAHEAD) 567 nmp->nm_readahead = argp->readahead; 568 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 569 argp->deadthresh <= NFS_NEVERDEAD) 570 nmp->nm_deadthresh = argp->deadthresh; 571 572 adjsock |= ((nmp->nm_sotype != argp->sotype) || 573 (nmp->nm_soproto != argp->proto)); 574 nmp->nm_sotype = argp->sotype; 575 nmp->nm_soproto = argp->proto; 576 577 if (nmp->nm_so && adjsock) { 578 nfs_safedisconnect(nmp); 579 if (nmp->nm_sotype == SOCK_DGRAM) 580 while (nfs_connect(nmp, (struct nfsreq *)0, l)) { 581 printf("nfs_args: retrying connect\n"); 582 kpause("nfscn3", false, hz, NULL); 583 } 584 } 585 } 586 587 /* 588 * VFS Operations. 589 * 590 * mount system call 591 * It seems a bit dumb to copyinstr() the host and path here and then 592 * memcpy() them in mountnfs(), but I wanted to detect errors before 593 * doing the sockargs() call because sockargs() allocates an mbuf and 594 * an error after that means that I have to release the mbuf. 595 */ 596 /* ARGSUSED */ 597 int 598 nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 599 { 600 struct lwp *l = curlwp; 601 int error; 602 struct nfs_args *args = data; 603 struct mbuf *nam; 604 struct nfsmount *nmp = VFSTONFS(mp); 605 struct sockaddr *sa; 606 struct vnode *vp; 607 char *pth, *hst; 608 struct proc *p; 609 size_t len; 610 u_char *nfh; 611 612 if (*data_len < sizeof *args) 613 return EINVAL; 614 615 p = l->l_proc; 616 if (mp->mnt_flag & MNT_GETARGS) { 617 618 if (nmp == NULL) 619 return (EIO); 620 if (args->addr != NULL) { 621 sa = mtod(nmp->nm_nam, struct sockaddr *); 622 error = copyout(sa, args->addr, sa->sa_len); 623 if (error) 624 return (error); 625 args->addrlen = sa->sa_len; 626 } else 627 args->addrlen = 0; 628 629 args->version = NFS_ARGSVERSION; 630 args->sotype = nmp->nm_sotype; 631 args->proto = nmp->nm_soproto; 632 args->fh = NULL; 633 args->fhsize = 0; 634 args->flags = nmp->nm_flag; 635 args->wsize = nmp->nm_wsize; 636 args->rsize = nmp->nm_rsize; 637 args->readdirsize = nmp->nm_readdirsize; 638 args->timeo = nmp->nm_timeo; 639 args->retrans = nmp->nm_retry; 640 args->maxgrouplist = nmp->nm_numgrps; 641 args->readahead = nmp->nm_readahead; 642 args->leaseterm = 0; /* dummy */ 643 args->deadthresh = nmp->nm_deadthresh; 644 args->hostname = NULL; 645 *data_len = sizeof *args; 646 return 0; 647 } 648 649 if (args->version != NFS_ARGSVERSION) 650 return (EPROGMISMATCH); 651 if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB)) 652 return (EPROGUNAVAIL); 653 #ifdef NFS_V2_ONLY 654 if (args->flags & NFSMNT_NFSV3) 655 return (EPROGMISMATCH); 656 #endif 657 if (mp->mnt_flag & MNT_UPDATE) { 658 if (nmp == NULL) 659 return (EIO); 660 /* 661 * When doing an update, we can't change from or to 662 * v3, or change cookie translation 663 */ 664 args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) | 665 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)); 666 nfs_decode_args(nmp, args, l); 667 return (0); 668 } 669 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 670 return (EINVAL); 671 nfh = malloc(NFSX_V3FHMAX, M_TEMP, M_WAITOK); 672 error = copyin(args->fh, nfh, args->fhsize); 673 if (error) 674 goto free_nfh; 675 pth = malloc(MNAMELEN, M_TEMP, M_WAITOK); 676 error = copyinstr(path, pth, MNAMELEN - 1, &len); 677 if (error) 678 goto free_pth; 679 memset(&pth[len], 0, MNAMELEN - len); 680 hst = malloc(MNAMELEN, M_TEMP, M_WAITOK); 681 error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len); 682 if (error) 683 goto free_hst; 684 memset(&hst[len], 0, MNAMELEN - len); 685 /* sockargs() call must be after above copyin() calls */ 686 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME); 687 if (error) 688 goto free_hst; 689 MCLAIM(nam, &nfs_mowner); 690 args->fh = nfh; 691 error = mountnfs(args, mp, nam, pth, hst, &vp, l); 692 693 free_hst: 694 free(hst, M_TEMP); 695 free_pth: 696 free(pth, M_TEMP); 697 free_nfh: 698 free(nfh, M_TEMP); 699 700 return (error); 701 } 702 703 /* 704 * Common code for mount and mountroot 705 */ 706 int 707 mountnfs(argp, mp, nam, pth, hst, vpp, l) 708 struct nfs_args *argp; 709 struct mount *mp; 710 struct mbuf *nam; 711 const char *pth, *hst; 712 struct vnode **vpp; 713 struct lwp *l; 714 { 715 struct nfsmount *nmp; 716 struct nfsnode *np; 717 struct vnode *vp; 718 int error; 719 struct vattr *attrs; 720 kauth_cred_t cr; 721 char iosname[IOSTATNAMELEN]; 722 723 /* 724 * If the number of nfs iothreads to use has never 725 * been set, create a reasonable number of them. 726 */ 727 728 if (nfs_niothreads < 0) { 729 nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS); 730 } 731 732 if (mp->mnt_flag & MNT_UPDATE) { 733 nmp = VFSTONFS(mp); 734 /* update paths, file handles, etc, here XXX */ 735 m_freem(nam); 736 return (0); 737 } else { 738 nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP); 739 mp->mnt_data = nmp; 740 TAILQ_INIT(&nmp->nm_uidlruhead); 741 TAILQ_INIT(&nmp->nm_bufq); 742 rw_init(&nmp->nm_writeverflock); 743 mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE); 744 rw_init(&nmp->nm_rbtlock); 745 cv_init(&nmp->nm_rcvcv, "nfsrcv"); 746 cv_init(&nmp->nm_sndcv, "nfssnd"); 747 cv_init(&nmp->nm_aiocv, "nfsaio"); 748 cv_init(&nmp->nm_disconcv, "nfsdis"); 749 nfs_rbtinit(nmp); 750 } 751 vfs_getnewfsid(mp); 752 nmp->nm_mountp = mp; 753 754 #ifndef NFS_V2_ONLY 755 if ((argp->flags & NFSMNT_NFSV3) == 0) 756 #endif 757 { 758 if (argp->fhsize != NFSX_V2FH) { 759 return EINVAL; 760 } 761 } 762 763 /* 764 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 765 * will overwrite this. 766 */ 767 nmp->nm_maxfilesize = 0xffffffffLL; 768 769 nmp->nm_timeo = NFS_TIMEO; 770 nmp->nm_retry = NFS_RETRANS; 771 nmp->nm_wsize = NFS_WSIZE; 772 nmp->nm_rsize = NFS_RSIZE; 773 nmp->nm_readdirsize = NFS_READDIRSIZE; 774 nmp->nm_numgrps = NFS_MAXGRPS; 775 nmp->nm_readahead = NFS_DEFRAHEAD; 776 nmp->nm_deadthresh = NFS_DEFDEADTHRESH; 777 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, 778 mp->mnt_op->vfs_name, mp, l); 779 if (error) 780 goto bad; 781 nmp->nm_nam = nam; 782 783 /* Set up the sockets and per-host congestion */ 784 nmp->nm_sotype = argp->sotype; 785 nmp->nm_soproto = argp->proto; 786 787 nfs_decode_args(nmp, argp, l); 788 789 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 790 mp->mnt_dev_bshift = DEV_BSHIFT; 791 792 /* 793 * For Connection based sockets (TCP,...) defer the connect until 794 * the first request, in case the server is not responding. 795 */ 796 if (nmp->nm_sotype == SOCK_DGRAM && 797 (error = nfs_connect(nmp, (struct nfsreq *)0, l))) 798 goto bad; 799 800 /* 801 * This is silly, but it has to be set so that vinifod() works. 802 * We do not want to do an nfs_statvfs() here since we can get 803 * stuck on a dead server and we are holding a lock on the mount 804 * point. 805 */ 806 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 807 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 808 if (error) 809 goto bad; 810 vp = NFSTOV(np); 811 attrs = malloc(sizeof(struct vattr), M_TEMP, M_WAITOK); 812 VOP_GETATTR(vp, attrs, l->l_cred); 813 if ((nmp->nm_flag & NFSMNT_NFSV3) && (vp->v_type == VDIR)) { 814 cr = kauth_cred_alloc(); 815 kauth_cred_setuid(cr, attrs->va_uid); 816 kauth_cred_seteuid(cr, attrs->va_uid); 817 kauth_cred_setsvuid(cr, attrs->va_uid); 818 kauth_cred_setgid(cr, attrs->va_gid); 819 kauth_cred_setegid(cr, attrs->va_gid); 820 kauth_cred_setsvgid(cr, attrs->va_gid); 821 nfs_cookieheuristic(vp, &nmp->nm_iflag, l, cr); 822 kauth_cred_free(cr); 823 } 824 free(attrs, M_TEMP); 825 826 /* 827 * A reference count is needed on the nfsnode representing the 828 * remote root. If this object is not persistent, then backward 829 * traversals of the mount point (i.e. "..") will not work if 830 * the nfsnode gets flushed out of the cache. Ufs does not have 831 * this problem, because one can identify root inodes by their 832 * number == ROOTINO (2). So, just unlock, but no rele. 833 */ 834 835 nmp->nm_vnode = vp; 836 if (vp->v_type == VNON) 837 vp->v_type = VDIR; 838 vp->v_vflag |= VV_ROOT; 839 VOP_UNLOCK(vp, 0); 840 *vpp = vp; 841 842 snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++); 843 nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname); 844 845 return (0); 846 bad: 847 nfs_disconnect(nmp); 848 rw_destroy(&nmp->nm_writeverflock); 849 rw_destroy(&nmp->nm_rbtlock); 850 mutex_destroy(&nmp->nm_lock); 851 cv_destroy(&nmp->nm_rcvcv); 852 cv_destroy(&nmp->nm_sndcv); 853 cv_destroy(&nmp->nm_aiocv); 854 cv_destroy(&nmp->nm_disconcv); 855 kmem_free(nmp, sizeof(*nmp)); 856 m_freem(nam); 857 return (error); 858 } 859 860 /* 861 * unmount system call 862 */ 863 int 864 nfs_unmount(struct mount *mp, int mntflags) 865 { 866 struct nfsmount *nmp; 867 struct vnode *vp; 868 int error, flags = 0; 869 870 if (mntflags & MNT_FORCE) 871 flags |= FORCECLOSE; 872 nmp = VFSTONFS(mp); 873 /* 874 * Goes something like this.. 875 * - Check for activity on the root vnode (other than ourselves). 876 * - Call vflush() to clear out vnodes for this file system, 877 * except for the root vnode. 878 * - Decrement reference on the vnode representing remote root. 879 * - Close the socket 880 * - Free up the data structures 881 */ 882 /* 883 * We need to decrement the ref. count on the nfsnode representing 884 * the remote root. See comment in mountnfs(). The VFS unmount() 885 * has done vput on this vnode, otherwise we would get deadlock! 886 */ 887 vp = nmp->nm_vnode; 888 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 889 if (error != 0) 890 return error; 891 892 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 893 vput(vp); 894 return (EBUSY); 895 } 896 897 error = vflush(mp, vp, flags); 898 if (error) { 899 vput(vp); 900 return (error); 901 } 902 903 /* 904 * We are now committed to the unmount; mark the mount structure 905 * as doomed so that any sleepers kicked awake by nfs_disconnect 906 * will go away cleanly. 907 */ 908 nmp->nm_iflag |= NFSMNT_DISMNT; 909 910 /* 911 * Clean up the stats... note that we carefully avoid decrementing 912 * nfs_mount_count here for good reason - we may not be unmounting 913 * the last thing mounted. 914 */ 915 iostat_free(nmp->nm_stats); 916 917 /* 918 * There are two reference counts to get rid of here 919 * (see comment in mountnfs()). 920 */ 921 vput(vp); 922 vgone(vp); 923 nfs_disconnect(nmp); 924 m_freem(nmp->nm_nam); 925 926 rw_destroy(&nmp->nm_writeverflock); 927 rw_destroy(&nmp->nm_rbtlock); 928 mutex_destroy(&nmp->nm_lock); 929 cv_destroy(&nmp->nm_rcvcv); 930 cv_destroy(&nmp->nm_sndcv); 931 cv_destroy(&nmp->nm_aiocv); 932 cv_destroy(&nmp->nm_disconcv); 933 kmem_free(nmp, sizeof(*nmp)); 934 return (0); 935 } 936 937 /* 938 * Return root of a filesystem 939 */ 940 int 941 nfs_root(mp, vpp) 942 struct mount *mp; 943 struct vnode **vpp; 944 { 945 struct vnode *vp; 946 struct nfsmount *nmp; 947 int error; 948 949 nmp = VFSTONFS(mp); 950 vp = nmp->nm_vnode; 951 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 952 if (error != 0) 953 return error; 954 *vpp = vp; 955 return (0); 956 } 957 958 extern int syncprt; 959 960 /* 961 * Flush out the buffer cache 962 */ 963 /* ARGSUSED */ 964 int 965 nfs_sync(mp, waitfor, cred) 966 struct mount *mp; 967 int waitfor; 968 kauth_cred_t cred; 969 { 970 struct vnode *vp, *mvp; 971 int error, allerror = 0; 972 973 /* 974 * Force stale buffer cache information to be flushed. 975 */ 976 if ((mvp = vnalloc(mp)) == NULL) 977 return (ENOMEM); 978 loop: 979 /* 980 * NOTE: not using the TAILQ_FOREACH here since in this loop vgone() 981 * and vclean() can be called indirectly 982 */ 983 mutex_enter(&mntvnode_lock); 984 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 985 vmark(mvp, vp); 986 if (vp->v_mount != mp || vismarker(vp)) 987 continue; 988 mutex_enter(&vp->v_interlock); 989 /* XXX MNT_LAZY cannot be right? */ 990 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 991 (LIST_EMPTY(&vp->v_dirtyblkhd) && 992 UVM_OBJ_IS_CLEAN(&vp->v_uobj))) { 993 mutex_exit(&vp->v_interlock); 994 continue; 995 } 996 mutex_exit(&mntvnode_lock); 997 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) { 998 (void)vunmark(mvp); 999 goto loop; 1000 } 1001 error = VOP_FSYNC(vp, cred, 1002 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); 1003 if (error) 1004 allerror = error; 1005 vput(vp); 1006 mutex_enter(&mntvnode_lock); 1007 } 1008 mutex_exit(&mntvnode_lock); 1009 vnfree(mvp); 1010 return (allerror); 1011 } 1012 1013 /* 1014 * NFS flat namespace lookup. 1015 * Currently unsupported. 1016 */ 1017 /* ARGSUSED */ 1018 int 1019 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 1020 { 1021 1022 return (EOPNOTSUPP); 1023 } 1024 1025 /* 1026 * Do that sysctl thang... 1027 */ 1028 static int 1029 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 1030 { 1031 struct sysctlnode node; 1032 int val; 1033 int error; 1034 1035 val = nfs_niothreads; 1036 node = *rnode; 1037 node.sysctl_data = &val; 1038 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1039 if (error || newp == NULL) 1040 return error; 1041 1042 return nfs_set_niothreads(val); 1043 } 1044 1045 static void 1046 nfs_sysctl_init(void) 1047 { 1048 1049 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1050 CTLFLAG_PERMANENT, 1051 CTLTYPE_NODE, "vfs", NULL, 1052 NULL, 0, NULL, 0, 1053 CTL_VFS, CTL_EOL); 1054 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1055 CTLFLAG_PERMANENT, 1056 CTLTYPE_NODE, "nfs", 1057 SYSCTL_DESCR("NFS vfs options"), 1058 NULL, 0, NULL, 0, 1059 CTL_VFS, 2, CTL_EOL); 1060 /* 1061 * XXX the "2" above could be dynamic, thereby eliminating one 1062 * more instance of the "number to vfs" mapping problem, but 1063 * "2" is the order as taken from sys/mount.h 1064 */ 1065 1066 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1067 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1068 CTLTYPE_STRUCT, "nfsstats", 1069 SYSCTL_DESCR("NFS operation statistics"), 1070 NULL, 0, &nfsstats, sizeof(nfsstats), 1071 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1072 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1073 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1074 CTLTYPE_INT, "iothreads", 1075 SYSCTL_DESCR("Number of NFS client processes desired"), 1076 sysctl_vfs_nfs_iothreads, 0, NULL, 0, 1077 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1078 } 1079 1080 static void 1081 nfs_sysctl_fini(void) 1082 { 1083 1084 sysctl_teardown(&nfs_clog); 1085 } 1086 1087 /* ARGSUSED */ 1088 int 1089 nfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 1090 { 1091 size_t fidsize; 1092 size_t fhsize; 1093 struct nfsnode *np; 1094 int error; 1095 struct vattr va; 1096 1097 fidsize = fid->fid_len; 1098 if (fidsize < sizeof(*fid)) { 1099 return EINVAL; 1100 } 1101 fhsize = fidsize - sizeof(*fid); 1102 if ((fhsize % NFSX_UNSIGNED) != 0) { 1103 return EINVAL; 1104 } 1105 if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) { 1106 if (fhsize > NFSX_V3FHMAX || fhsize == 0) { 1107 return EINVAL; 1108 } 1109 } else { 1110 if (fhsize != NFSX_V2FH) { 1111 return EINVAL; 1112 } 1113 } 1114 error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np); 1115 if (error) { 1116 return error; 1117 } 1118 *vpp = NFSTOV(np); 1119 error = VOP_GETATTR(*vpp, &va, kauth_cred_get()); 1120 if (error != 0) { 1121 vput(*vpp); 1122 } 1123 return error; 1124 } 1125 1126 /* ARGSUSED */ 1127 int 1128 nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize) 1129 { 1130 struct nfsnode *np; 1131 struct fid *fid; 1132 size_t fidsize; 1133 int error = 0; 1134 1135 np = VTONFS(vp); 1136 fidsize = sizeof(*fid) + np->n_fhsize; 1137 if (*bufsize < fidsize) { 1138 error = E2BIG; 1139 } 1140 *bufsize = fidsize; 1141 if (error == 0) { 1142 struct fid fid_store; 1143 1144 fid = &fid_store; 1145 memset(fid, 0, sizeof(*fid)); 1146 fid->fid_len = fidsize; 1147 memcpy(buf, fid, sizeof(*fid)); 1148 memcpy(buf->fid_data, np->n_fhp, np->n_fhsize); 1149 } 1150 return error; 1151 } 1152 1153 /* 1154 * Vfs start routine, a no-op. 1155 */ 1156 /* ARGSUSED */ 1157 int 1158 nfs_start(struct mount *mp, int flags) 1159 { 1160 1161 return (0); 1162 } 1163