1 /* $NetBSD: nfs_vfsops.c,v 1.196 2008/02/13 09:51:37 yamt 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 1.196 2008/02/13 09:51:37 yamt 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 nfs_vnodeopv_descs, 125 0, 126 { NULL, NULL }, 127 }; 128 VFS_ATTACH(nfs_vfsops); 129 130 extern u_int32_t nfs_procids[NFS_NPROCS]; 131 extern u_int32_t nfs_prog, nfs_vers; 132 133 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 134 struct mount **, struct vnode **, struct lwp *)); 135 136 /* 137 * nfs statvfs call 138 */ 139 int 140 nfs_statvfs(mp, sbp) 141 struct mount *mp; 142 struct statvfs *sbp; 143 { 144 struct lwp *l = curlwp; 145 struct vnode *vp; 146 struct nfs_statfs *sfp; 147 char *cp; 148 u_int32_t *tl; 149 int32_t t1, t2; 150 char *bpos, *dpos, *cp2; 151 struct nfsmount *nmp = VFSTONFS(mp); 152 int error = 0, retattr; 153 #ifdef NFS_V2_ONLY 154 const int v3 = 0; 155 #else 156 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 157 #endif 158 struct mbuf *mreq, *mrep = NULL, *md, *mb; 159 kauth_cred_t cred; 160 u_quad_t tquad; 161 struct nfsnode *np; 162 163 #ifndef nolint 164 sfp = (struct nfs_statfs *)0; 165 #endif 166 vp = nmp->nm_vnode; 167 np = VTONFS(vp); 168 cred = kauth_cred_alloc(); 169 #ifndef NFS_V2_ONLY 170 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 171 (void)nfs_fsinfo(nmp, vp, cred, l); 172 #endif 173 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 174 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 175 nfsm_fhtom(np, v3); 176 nfsm_request(np, NFSPROC_FSSTAT, l, cred); 177 if (v3) 178 nfsm_postop_attr(vp, retattr, 0); 179 if (error) { 180 if (mrep != NULL) { 181 if (mrep->m_next != NULL) 182 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 183 m_freem(mrep); 184 } 185 goto nfsmout; 186 } 187 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 188 sbp->f_flag = nmp->nm_flag; 189 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 190 if (v3) { 191 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 192 tquad = fxdr_hyper(&sfp->sf_tbytes); 193 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 194 tquad = fxdr_hyper(&sfp->sf_fbytes); 195 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 196 tquad = fxdr_hyper(&sfp->sf_abytes); 197 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 198 sbp->f_bresvd = sbp->f_bfree - tquad; 199 sbp->f_bavail = tquad; 200 #ifdef COMPAT_20 201 /* Handle older NFS servers returning negative values */ 202 if ((quad_t)sbp->f_bavail < 0) 203 sbp->f_bavail = 0; 204 #endif 205 tquad = fxdr_hyper(&sfp->sf_tfiles); 206 sbp->f_files = tquad; 207 tquad = fxdr_hyper(&sfp->sf_ffiles); 208 sbp->f_ffree = tquad; 209 sbp->f_favail = tquad; 210 sbp->f_fresvd = 0; 211 sbp->f_namemax = MAXNAMLEN; 212 } else { 213 sbp->f_bsize = NFS_FABLKSIZE; 214 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 215 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 216 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 217 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 218 sbp->f_fresvd = 0; 219 sbp->f_files = 0; 220 sbp->f_ffree = 0; 221 sbp->f_favail = 0; 222 sbp->f_fresvd = 0; 223 sbp->f_namemax = MAXNAMLEN; 224 } 225 copy_statvfs_info(sbp, mp); 226 nfsm_reqdone; 227 kauth_cred_free(cred); 228 return (error); 229 } 230 231 #ifndef NFS_V2_ONLY 232 /* 233 * nfs version 3 fsinfo rpc call 234 */ 235 int 236 nfs_fsinfo(nmp, vp, cred, l) 237 struct nfsmount *nmp; 238 struct vnode *vp; 239 kauth_cred_t cred; 240 struct lwp *l; 241 { 242 struct nfsv3_fsinfo *fsp; 243 char *cp; 244 int32_t t1, t2; 245 u_int32_t *tl, pref, xmax; 246 char *bpos, *dpos, *cp2; 247 int error = 0, retattr; 248 struct mbuf *mreq, *mrep, *md, *mb; 249 u_int64_t maxfsize; 250 struct nfsnode *np = VTONFS(vp); 251 252 nfsstats.rpccnt[NFSPROC_FSINFO]++; 253 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 254 nfsm_fhtom(np, 1); 255 nfsm_request(np, NFSPROC_FSINFO, l, cred); 256 nfsm_postop_attr(vp, retattr, 0); 257 if (!error) { 258 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 259 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 260 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 261 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 262 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 263 ~(NFS_FABLKSIZE - 1); 264 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 265 if (xmax < nmp->nm_wsize && xmax > 0) { 266 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1); 267 if (nmp->nm_wsize == 0) 268 nmp->nm_wsize = xmax; 269 } 270 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 271 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 272 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 273 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 274 ~(NFS_FABLKSIZE - 1); 275 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 276 if (xmax < nmp->nm_rsize && xmax > 0) { 277 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1); 278 if (nmp->nm_rsize == 0) 279 nmp->nm_rsize = xmax; 280 } 281 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 282 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 283 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 284 ~(NFS_DIRFRAGSIZ - 1); 285 if (xmax < nmp->nm_readdirsize && xmax > 0) { 286 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1); 287 if (nmp->nm_readdirsize == 0) 288 nmp->nm_readdirsize = xmax; 289 } 290 /* XXX */ 291 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 292 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 293 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 294 nmp->nm_maxfilesize = maxfsize; 295 nmp->nm_mountp->mnt_fs_bshift = 296 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 297 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 298 } 299 nfsm_reqdone; 300 return (error); 301 } 302 #endif 303 304 /* 305 * Mount a remote root fs via. NFS. It goes like this: 306 * - Call nfs_boot_init() to fill in the nfs_diskless struct 307 * - build the rootfs mount point and call mountnfs() to do the rest. 308 */ 309 int 310 nfs_mountroot() 311 { 312 struct timespec ts; 313 struct nfs_diskless *nd; 314 struct vattr attr; 315 struct mount *mp; 316 struct vnode *vp; 317 struct lwp *l; 318 long n; 319 int error; 320 321 l = curlwp; /* XXX */ 322 323 if (device_class(root_device) != DV_IFNET) 324 return (ENODEV); 325 326 /* 327 * XXX time must be non-zero when we init the interface or else 328 * the arp code will wedge. [Fixed now in if_ether.c] 329 * However, the NFS attribute cache gives false "hits" when the 330 * current time < nfs_attrtimeo(nmp, np) so keep this in for now. 331 */ 332 if (time_second < NFS_MAXATTRTIMO) { 333 ts.tv_sec = NFS_MAXATTRTIMO; 334 ts.tv_nsec = 0; 335 tc_setclock(&ts); 336 } 337 338 /* 339 * Call nfs_boot_init() to fill in the nfs_diskless struct. 340 * Side effect: Finds and configures a network interface. 341 */ 342 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP); 343 error = nfs_boot_init(nd, l); 344 if (error) { 345 kmem_free(nd, sizeof(*nd)); 346 return (error); 347 } 348 349 /* 350 * Create the root mount point. 351 */ 352 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); 353 if (error) 354 goto out; 355 printf("root on %s\n", nd->nd_root.ndm_host); 356 357 /* 358 * Link it into the mount list. 359 */ 360 mutex_enter(&mountlist_lock); 361 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 362 mutex_exit(&mountlist_lock); 363 rootvp = vp; 364 mp->mnt_vnodecovered = NULLVP; 365 vfs_unbusy(mp, false); 366 367 /* Get root attributes (for the time). */ 368 error = VOP_GETATTR(vp, &attr, l->l_cred); 369 if (error) 370 panic("nfs_mountroot: getattr for root"); 371 n = attr.va_atime.tv_sec; 372 #ifdef DEBUG 373 printf("root time: 0x%lx\n", n); 374 #endif 375 setrootfstime(n); 376 377 out: 378 if (error) 379 nfs_boot_cleanup(nd, l); 380 kmem_free(nd, sizeof(*nd)); 381 return (error); 382 } 383 384 /* 385 * Internal version of mount system call for diskless setup. 386 * Separate function because we used to call it twice. 387 * (once for root and once for swap) 388 */ 389 static int 390 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, l) 391 struct nfs_dlmount *ndmntp; 392 const char *mntname; /* mount point name */ 393 struct mount **mpp; 394 struct vnode **vpp; 395 struct lwp *l; 396 { 397 struct mount *mp; 398 struct mbuf *m; 399 int error; 400 401 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp); 402 403 mp->mnt_op = &nfs_vfsops; 404 405 /* 406 * Historical practice expects NFS root file systems to 407 * be initially mounted r/w. 408 */ 409 mp->mnt_flag &= ~MNT_RDONLY; 410 411 /* Get mbuf for server sockaddr. */ 412 m = m_get(M_WAIT, MT_SONAME); 413 if (m == NULL) 414 panic("nfs_mountroot: mget soname for %s", mntname); 415 MCLAIM(m, &nfs_mowner); 416 memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr, 417 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 418 419 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 420 ndmntp->ndm_args.hostname, vpp, l); 421 if (error) { 422 vfs_unbusy(mp, false); 423 vfs_destroy(mp); 424 printf("nfs_mountroot: mount %s failed: %d\n", 425 mntname, error); 426 } else 427 *mpp = mp; 428 429 return (error); 430 } 431 432 void 433 nfs_decode_args(nmp, argp, l) 434 struct nfsmount *nmp; 435 struct nfs_args *argp; 436 struct lwp *l; 437 { 438 int s; 439 int adjsock; 440 int maxio; 441 442 s = splsoftnet(); 443 444 /* 445 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 446 * no sense in that context. 447 */ 448 if (argp->sotype == SOCK_STREAM) 449 argp->flags &= ~NFSMNT_NOCONN; 450 451 /* 452 * Cookie translation is not needed for v2, silently ignore it. 453 */ 454 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 455 NFSMNT_XLATECOOKIE) 456 argp->flags &= ~NFSMNT_XLATECOOKIE; 457 458 /* Re-bind if rsrvd port requested and wasn't on one */ 459 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 460 && (argp->flags & NFSMNT_RESVPORT); 461 /* Also re-bind if we're switching to/from a connected UDP socket */ 462 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 463 (argp->flags & NFSMNT_NOCONN)); 464 465 /* Update flags. */ 466 nmp->nm_flag = argp->flags; 467 splx(s); 468 469 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 470 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 471 if (nmp->nm_timeo < NFS_MINTIMEO) 472 nmp->nm_timeo = NFS_MINTIMEO; 473 else if (nmp->nm_timeo > NFS_MAXTIMEO) 474 nmp->nm_timeo = NFS_MAXTIMEO; 475 } 476 477 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 478 nmp->nm_retry = argp->retrans; 479 if (nmp->nm_retry > NFS_MAXREXMIT) 480 nmp->nm_retry = NFS_MAXREXMIT; 481 } 482 483 #ifndef NFS_V2_ONLY 484 if (argp->flags & NFSMNT_NFSV3) { 485 if (argp->sotype == SOCK_DGRAM) 486 maxio = NFS_MAXDGRAMDATA; 487 else 488 maxio = NFS_MAXDATA; 489 } else 490 #endif 491 maxio = NFS_V2MAXDATA; 492 493 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 494 int osize = nmp->nm_wsize; 495 nmp->nm_wsize = argp->wsize; 496 /* Round down to multiple of blocksize */ 497 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 498 if (nmp->nm_wsize <= 0) 499 nmp->nm_wsize = NFS_FABLKSIZE; 500 adjsock |= (nmp->nm_wsize != osize); 501 } 502 if (nmp->nm_wsize > maxio) 503 nmp->nm_wsize = maxio; 504 if (nmp->nm_wsize > MAXBSIZE) 505 nmp->nm_wsize = MAXBSIZE; 506 507 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 508 int osize = nmp->nm_rsize; 509 nmp->nm_rsize = argp->rsize; 510 /* Round down to multiple of blocksize */ 511 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 512 if (nmp->nm_rsize <= 0) 513 nmp->nm_rsize = NFS_FABLKSIZE; 514 adjsock |= (nmp->nm_rsize != osize); 515 } 516 if (nmp->nm_rsize > maxio) 517 nmp->nm_rsize = maxio; 518 if (nmp->nm_rsize > MAXBSIZE) 519 nmp->nm_rsize = MAXBSIZE; 520 521 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 522 nmp->nm_readdirsize = argp->readdirsize; 523 /* Round down to multiple of minimum blocksize */ 524 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 525 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 526 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 527 /* Bigger than buffer size makes no sense */ 528 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 529 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 530 } else if (argp->flags & NFSMNT_RSIZE) 531 nmp->nm_readdirsize = nmp->nm_rsize; 532 533 if (nmp->nm_readdirsize > maxio) 534 nmp->nm_readdirsize = maxio; 535 536 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 537 argp->maxgrouplist <= NFS_MAXGRPS) 538 nmp->nm_numgrps = argp->maxgrouplist; 539 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 540 argp->readahead <= NFS_MAXRAHEAD) 541 nmp->nm_readahead = argp->readahead; 542 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 543 argp->deadthresh <= NFS_NEVERDEAD) 544 nmp->nm_deadthresh = argp->deadthresh; 545 546 adjsock |= ((nmp->nm_sotype != argp->sotype) || 547 (nmp->nm_soproto != argp->proto)); 548 nmp->nm_sotype = argp->sotype; 549 nmp->nm_soproto = argp->proto; 550 551 if (nmp->nm_so && adjsock) { 552 nfs_safedisconnect(nmp); 553 if (nmp->nm_sotype == SOCK_DGRAM) 554 while (nfs_connect(nmp, (struct nfsreq *)0, l)) { 555 printf("nfs_args: retrying connect\n"); 556 kpause("nfscn3", false, hz, NULL); 557 } 558 } 559 } 560 561 /* 562 * VFS Operations. 563 * 564 * mount system call 565 * It seems a bit dumb to copyinstr() the host and path here and then 566 * memcpy() them in mountnfs(), but I wanted to detect errors before 567 * doing the sockargs() call because sockargs() allocates an mbuf and 568 * an error after that means that I have to release the mbuf. 569 */ 570 /* ARGSUSED */ 571 int 572 nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 573 { 574 struct lwp *l = curlwp; 575 int error; 576 struct nfs_args *args = data; 577 struct mbuf *nam; 578 struct nfsmount *nmp = VFSTONFS(mp); 579 struct sockaddr *sa; 580 struct vnode *vp; 581 char *pth, *hst; 582 struct proc *p; 583 size_t len; 584 u_char *nfh; 585 586 if (*data_len < sizeof *args) 587 return EINVAL; 588 589 p = l->l_proc; 590 if (mp->mnt_flag & MNT_GETARGS) { 591 592 if (nmp == NULL) 593 return (EIO); 594 if (args->addr != NULL) { 595 sa = mtod(nmp->nm_nam, struct sockaddr *); 596 error = copyout(sa, args->addr, sa->sa_len); 597 if (error) 598 return (error); 599 args->addrlen = sa->sa_len; 600 } else 601 args->addrlen = 0; 602 603 args->version = NFS_ARGSVERSION; 604 args->sotype = nmp->nm_sotype; 605 args->proto = nmp->nm_soproto; 606 args->fh = NULL; 607 args->fhsize = 0; 608 args->flags = nmp->nm_flag; 609 args->wsize = nmp->nm_wsize; 610 args->rsize = nmp->nm_rsize; 611 args->readdirsize = nmp->nm_readdirsize; 612 args->timeo = nmp->nm_timeo; 613 args->retrans = nmp->nm_retry; 614 args->maxgrouplist = nmp->nm_numgrps; 615 args->readahead = nmp->nm_readahead; 616 args->leaseterm = 0; /* dummy */ 617 args->deadthresh = nmp->nm_deadthresh; 618 args->hostname = NULL; 619 *data_len = sizeof *args; 620 return 0; 621 } 622 623 if (args->version != NFS_ARGSVERSION) 624 return (EPROGMISMATCH); 625 if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB)) 626 return (EPROGUNAVAIL); 627 #ifdef NFS_V2_ONLY 628 if (args->flags & NFSMNT_NFSV3) 629 return (EPROGMISMATCH); 630 #endif 631 if (mp->mnt_flag & MNT_UPDATE) { 632 if (nmp == NULL) 633 return (EIO); 634 /* 635 * When doing an update, we can't change from or to 636 * v3, or change cookie translation 637 */ 638 args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) | 639 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)); 640 nfs_decode_args(nmp, args, l); 641 return (0); 642 } 643 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 644 return (EINVAL); 645 MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK); 646 error = copyin(args->fh, nfh, args->fhsize); 647 if (error) 648 goto free_nfh; 649 MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK); 650 error = copyinstr(path, pth, MNAMELEN - 1, &len); 651 if (error) 652 goto free_pth; 653 memset(&pth[len], 0, MNAMELEN - len); 654 MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK); 655 error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len); 656 if (error) 657 goto free_hst; 658 memset(&hst[len], 0, MNAMELEN - len); 659 /* sockargs() call must be after above copyin() calls */ 660 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME); 661 if (error) 662 goto free_hst; 663 MCLAIM(nam, &nfs_mowner); 664 args->fh = nfh; 665 error = mountnfs(args, mp, nam, pth, hst, &vp, l); 666 667 free_hst: 668 FREE(hst, M_TEMP); 669 free_pth: 670 FREE(pth, M_TEMP); 671 free_nfh: 672 FREE(nfh, M_TEMP); 673 674 return (error); 675 } 676 677 /* 678 * Common code for mount and mountroot 679 */ 680 int 681 mountnfs(argp, mp, nam, pth, hst, vpp, l) 682 struct nfs_args *argp; 683 struct mount *mp; 684 struct mbuf *nam; 685 const char *pth, *hst; 686 struct vnode **vpp; 687 struct lwp *l; 688 { 689 struct nfsmount *nmp; 690 struct nfsnode *np; 691 int error; 692 struct vattr *attrs; 693 kauth_cred_t cr; 694 char iosname[IOSTATNAMELEN]; 695 696 /* 697 * If the number of nfs iothreads to use has never 698 * been set, create a reasonable number of them. 699 */ 700 701 if (nfs_niothreads < 0) { 702 nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS); 703 } 704 705 if (mp->mnt_flag & MNT_UPDATE) { 706 nmp = VFSTONFS(mp); 707 /* update paths, file handles, etc, here XXX */ 708 m_freem(nam); 709 return (0); 710 } else { 711 nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP); 712 mp->mnt_data = nmp; 713 TAILQ_INIT(&nmp->nm_uidlruhead); 714 TAILQ_INIT(&nmp->nm_bufq); 715 rw_init(&nmp->nm_writeverflock); 716 mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE); 717 cv_init(&nmp->nm_rcvcv, "nfsrcv"); 718 cv_init(&nmp->nm_sndcv, "nfssnd"); 719 cv_init(&nmp->nm_aiocv, "nfsaio"); 720 cv_init(&nmp->nm_disconcv, "nfsdis"); 721 } 722 vfs_getnewfsid(mp); 723 nmp->nm_mountp = mp; 724 725 #ifndef NFS_V2_ONLY 726 if ((argp->flags & NFSMNT_NFSV3) == 0) 727 #endif 728 { 729 if (argp->fhsize != NFSX_V2FH) { 730 return EINVAL; 731 } 732 } 733 734 /* 735 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 736 * will overwrite this. 737 */ 738 nmp->nm_maxfilesize = 0xffffffffLL; 739 740 nmp->nm_timeo = NFS_TIMEO; 741 nmp->nm_retry = NFS_RETRANS; 742 nmp->nm_wsize = NFS_WSIZE; 743 nmp->nm_rsize = NFS_RSIZE; 744 nmp->nm_readdirsize = NFS_READDIRSIZE; 745 nmp->nm_numgrps = NFS_MAXGRPS; 746 nmp->nm_readahead = NFS_DEFRAHEAD; 747 nmp->nm_deadthresh = NFS_DEFDEADTHRESH; 748 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, 749 mp->mnt_op->vfs_name, mp, l); 750 if (error) 751 goto bad; 752 nmp->nm_nam = nam; 753 754 /* Set up the sockets and per-host congestion */ 755 nmp->nm_sotype = argp->sotype; 756 nmp->nm_soproto = argp->proto; 757 758 nfs_decode_args(nmp, argp, l); 759 760 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 761 mp->mnt_dev_bshift = DEV_BSHIFT; 762 763 /* 764 * For Connection based sockets (TCP,...) defer the connect until 765 * the first request, in case the server is not responding. 766 */ 767 if (nmp->nm_sotype == SOCK_DGRAM && 768 (error = nfs_connect(nmp, (struct nfsreq *)0, l))) 769 goto bad; 770 771 /* 772 * This is silly, but it has to be set so that vinifod() works. 773 * We do not want to do an nfs_statvfs() here since we can get 774 * stuck on a dead server and we are holding a lock on the mount 775 * point. 776 */ 777 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 778 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 779 if (error) 780 goto bad; 781 *vpp = NFSTOV(np); 782 MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK); 783 VOP_GETATTR(*vpp, attrs, l->l_cred); 784 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 785 cr = kauth_cred_alloc(); 786 kauth_cred_setuid(cr, attrs->va_uid); 787 kauth_cred_seteuid(cr, attrs->va_uid); 788 kauth_cred_setsvuid(cr, attrs->va_uid); 789 kauth_cred_setgid(cr, attrs->va_gid); 790 kauth_cred_setegid(cr, attrs->va_gid); 791 kauth_cred_setsvgid(cr, attrs->va_gid); 792 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, l, cr); 793 kauth_cred_free(cr); 794 } 795 FREE(attrs, M_TEMP); 796 797 /* 798 * A reference count is needed on the nfsnode representing the 799 * remote root. If this object is not persistent, then backward 800 * traversals of the mount point (i.e. "..") will not work if 801 * the nfsnode gets flushed out of the cache. Ufs does not have 802 * this problem, because one can identify root inodes by their 803 * number == ROOTINO (2). So, just unlock, but no rele. 804 */ 805 806 nmp->nm_vnode = *vpp; 807 VOP_UNLOCK(*vpp, 0); 808 809 snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++); 810 nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname); 811 812 return (0); 813 bad: 814 nfs_disconnect(nmp); 815 rw_destroy(&nmp->nm_writeverflock); 816 mutex_destroy(&nmp->nm_lock); 817 cv_destroy(&nmp->nm_rcvcv); 818 cv_destroy(&nmp->nm_sndcv); 819 cv_destroy(&nmp->nm_aiocv); 820 cv_destroy(&nmp->nm_disconcv); 821 kmem_free(nmp, sizeof(*nmp)); 822 m_freem(nam); 823 return (error); 824 } 825 826 /* 827 * unmount system call 828 */ 829 int 830 nfs_unmount(struct mount *mp, int mntflags) 831 { 832 struct nfsmount *nmp; 833 struct vnode *vp; 834 int error, flags = 0; 835 836 if (mntflags & MNT_FORCE) 837 flags |= FORCECLOSE; 838 nmp = VFSTONFS(mp); 839 /* 840 * Goes something like this.. 841 * - Check for activity on the root vnode (other than ourselves). 842 * - Call vflush() to clear out vnodes for this file system, 843 * except for the root vnode. 844 * - Decrement reference on the vnode representing remote root. 845 * - Close the socket 846 * - Free up the data structures 847 */ 848 /* 849 * We need to decrement the ref. count on the nfsnode representing 850 * the remote root. See comment in mountnfs(). The VFS unmount() 851 * has done vput on this vnode, otherwise we would get deadlock! 852 */ 853 vp = nmp->nm_vnode; 854 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 855 if (error != 0) 856 return error; 857 858 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 859 vput(vp); 860 return (EBUSY); 861 } 862 863 error = vflush(mp, vp, flags); 864 if (error) { 865 vput(vp); 866 return (error); 867 } 868 869 /* 870 * We are now committed to the unmount; mark the mount structure 871 * as doomed so that any sleepers kicked awake by nfs_disconnect 872 * will go away cleanly. 873 */ 874 nmp->nm_iflag |= NFSMNT_DISMNT; 875 876 /* 877 * Clean up the stats... note that we carefully avoid decrementing 878 * nfs_mount_count here for good reason - we may not be unmounting 879 * the last thing mounted. 880 */ 881 iostat_free(nmp->nm_stats); 882 883 /* 884 * There are two reference counts to get rid of here 885 * (see comment in mountnfs()). 886 */ 887 vput(vp); 888 vgone(vp); 889 nfs_disconnect(nmp); 890 m_freem(nmp->nm_nam); 891 892 rw_destroy(&nmp->nm_writeverflock); 893 mutex_destroy(&nmp->nm_lock); 894 cv_destroy(&nmp->nm_rcvcv); 895 cv_destroy(&nmp->nm_sndcv); 896 cv_destroy(&nmp->nm_aiocv); 897 cv_destroy(&nmp->nm_disconcv); 898 kmem_free(nmp, sizeof(*nmp)); 899 return (0); 900 } 901 902 /* 903 * Return root of a filesystem 904 */ 905 int 906 nfs_root(mp, vpp) 907 struct mount *mp; 908 struct vnode **vpp; 909 { 910 struct vnode *vp; 911 struct nfsmount *nmp; 912 int error; 913 914 nmp = VFSTONFS(mp); 915 vp = nmp->nm_vnode; 916 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 917 if (error != 0) 918 return error; 919 if (vp->v_type == VNON) 920 vp->v_type = VDIR; 921 vp->v_vflag = VV_ROOT; 922 *vpp = vp; 923 return (0); 924 } 925 926 extern int syncprt; 927 928 /* 929 * Flush out the buffer cache 930 */ 931 /* ARGSUSED */ 932 int 933 nfs_sync(mp, waitfor, cred) 934 struct mount *mp; 935 int waitfor; 936 kauth_cred_t cred; 937 { 938 struct vnode *vp, *mvp; 939 int error, allerror = 0; 940 941 /* 942 * Force stale buffer cache information to be flushed. 943 */ 944 if ((mvp = vnalloc(mp)) == NULL) 945 return (ENOMEM); 946 loop: 947 /* 948 * NOTE: not using the TAILQ_FOREACH here since in this loop vgone() 949 * and vclean() can be called indirectly 950 */ 951 mutex_enter(&mntvnode_lock); 952 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 953 vmark(mvp, vp); 954 if (vp->v_mount != mp || vismarker(vp)) 955 continue; 956 mutex_enter(&vp->v_interlock); 957 /* XXX MNT_LAZY cannot be right? */ 958 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 959 (LIST_EMPTY(&vp->v_dirtyblkhd) && 960 UVM_OBJ_IS_CLEAN(&vp->v_uobj))) { 961 mutex_exit(&vp->v_interlock); 962 continue; 963 } 964 mutex_exit(&mntvnode_lock); 965 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) { 966 (void)vunmark(mvp); 967 goto loop; 968 } 969 error = VOP_FSYNC(vp, cred, 970 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); 971 if (error) 972 allerror = error; 973 vput(vp); 974 mutex_enter(&mntvnode_lock); 975 } 976 mutex_exit(&mntvnode_lock); 977 vnfree(mvp); 978 return (allerror); 979 } 980 981 /* 982 * NFS flat namespace lookup. 983 * Currently unsupported. 984 */ 985 /* ARGSUSED */ 986 int 987 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 988 { 989 990 return (EOPNOTSUPP); 991 } 992 993 /* 994 * Do that sysctl thang... 995 */ 996 static int 997 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 998 { 999 struct sysctlnode node; 1000 int val; 1001 int error; 1002 1003 val = nfs_niothreads; 1004 node = *rnode; 1005 node.sysctl_data = &val; 1006 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1007 if (error || newp == NULL) 1008 return error; 1009 1010 return nfs_set_niothreads(val); 1011 } 1012 1013 SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup") 1014 { 1015 1016 sysctl_createv(clog, 0, NULL, NULL, 1017 CTLFLAG_PERMANENT, 1018 CTLTYPE_NODE, "vfs", NULL, 1019 NULL, 0, NULL, 0, 1020 CTL_VFS, CTL_EOL); 1021 sysctl_createv(clog, 0, NULL, NULL, 1022 CTLFLAG_PERMANENT, 1023 CTLTYPE_NODE, "nfs", 1024 SYSCTL_DESCR("NFS vfs options"), 1025 NULL, 0, NULL, 0, 1026 CTL_VFS, 2, CTL_EOL); 1027 /* 1028 * XXX the "2" above could be dynamic, thereby eliminating one 1029 * more instance of the "number to vfs" mapping problem, but 1030 * "2" is the order as taken from sys/mount.h 1031 */ 1032 1033 sysctl_createv(clog, 0, NULL, NULL, 1034 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1035 CTLTYPE_STRUCT, "nfsstats", 1036 SYSCTL_DESCR("NFS operation statistics"), 1037 NULL, 0, &nfsstats, sizeof(nfsstats), 1038 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1039 sysctl_createv(clog, 0, NULL, NULL, 1040 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1041 CTLTYPE_INT, "iothreads", 1042 SYSCTL_DESCR("Number of NFS client processes desired"), 1043 sysctl_vfs_nfs_iothreads, 0, NULL, 0, 1044 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1045 } 1046 1047 /* ARGSUSED */ 1048 int 1049 nfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 1050 { 1051 size_t fidsize; 1052 size_t fhsize; 1053 struct nfsnode *np; 1054 int error; 1055 struct vattr va; 1056 1057 fidsize = fid->fid_len; 1058 if (fidsize < sizeof(*fid)) { 1059 return EINVAL; 1060 } 1061 fhsize = fidsize - sizeof(*fid); 1062 if ((fhsize % NFSX_UNSIGNED) != 0) { 1063 return EINVAL; 1064 } 1065 if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) { 1066 if (fhsize > NFSX_V3FHMAX || fhsize == 0) { 1067 return EINVAL; 1068 } 1069 } else { 1070 if (fhsize != NFSX_V2FH) { 1071 return EINVAL; 1072 } 1073 } 1074 error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np); 1075 if (error) { 1076 return error; 1077 } 1078 *vpp = NFSTOV(np); 1079 error = VOP_GETATTR(*vpp, &va, kauth_cred_get()); 1080 if (error != 0) { 1081 vput(*vpp); 1082 } 1083 return error; 1084 } 1085 1086 /* ARGSUSED */ 1087 int 1088 nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize) 1089 { 1090 struct nfsnode *np; 1091 struct fid *fid; 1092 size_t fidsize; 1093 int error = 0; 1094 1095 np = VTONFS(vp); 1096 fidsize = sizeof(*fid) + np->n_fhsize; 1097 if (*bufsize < fidsize) { 1098 error = E2BIG; 1099 } 1100 *bufsize = fidsize; 1101 if (error == 0) { 1102 struct fid fid_store; 1103 1104 fid = &fid_store; 1105 memset(fid, 0, sizeof(*fid)); 1106 fid->fid_len = fidsize; 1107 memcpy(buf, fid, sizeof(*fid)); 1108 memcpy(buf->fid_data, np->n_fhp, np->n_fhsize); 1109 } 1110 return error; 1111 } 1112 1113 /* 1114 * Vfs start routine, a no-op. 1115 */ 1116 /* ARGSUSED */ 1117 int 1118 nfs_start(struct mount *mp, int flags) 1119 { 1120 1121 return (0); 1122 } 1123