1 /* $NetBSD: nfs_vfsops.c,v 1.222 2013/09/14 22:27:01 martin 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 1.222 2013/09/14 22:27:01 martin 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 int nfs_commitsize; 90 91 /* 92 * nfs vfs operations. 93 */ 94 95 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 96 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 97 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 98 99 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 100 &nfsv2_vnodeop_opv_desc, 101 &spec_nfsv2nodeop_opv_desc, 102 &fifo_nfsv2nodeop_opv_desc, 103 NULL, 104 }; 105 106 struct vfsops nfs_vfsops = { 107 MOUNT_NFS, 108 sizeof (struct nfs_args), 109 nfs_mount, 110 nfs_start, 111 nfs_unmount, 112 nfs_root, 113 (void *)eopnotsupp, /* vfs_quotactl */ 114 nfs_statvfs, 115 nfs_sync, 116 nfs_vget, 117 nfs_fhtovp, 118 nfs_vptofh, 119 nfs_vfs_init, 120 NULL, 121 nfs_vfs_done, 122 nfs_mountroot, 123 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 124 vfs_stdextattrctl, 125 (void *)eopnotsupp, /* vfs_suspendctl */ 126 genfs_renamelock_enter, 127 genfs_renamelock_exit, 128 (void *)eopnotsupp, 129 nfs_vnodeopv_descs, 130 0, 131 { NULL, NULL }, 132 }; 133 134 extern u_int32_t nfs_procids[NFS_NPROCS]; 135 extern u_int32_t nfs_prog, nfs_vers; 136 static struct sysctllog *nfs_clog; 137 138 static int nfs_mount_diskless(struct nfs_dlmount *, const char *, 139 struct mount **, struct vnode **, struct lwp *); 140 static void nfs_sysctl_init(void); 141 static void nfs_sysctl_fini(void); 142 143 static int 144 nfs_modcmd(modcmd_t cmd, void *arg) 145 { 146 int error; 147 148 switch (cmd) { 149 case MODULE_CMD_INIT: 150 error = vfs_attach(&nfs_vfsops); 151 if (error == 0) { 152 nfs_sysctl_init(); 153 } 154 return error; 155 case MODULE_CMD_FINI: 156 error = vfs_detach(&nfs_vfsops); 157 if (error == 0) { 158 nfs_sysctl_fini(); 159 } 160 return error; 161 default: 162 return ENOTTY; 163 } 164 } 165 166 /* 167 * nfs statvfs call 168 */ 169 int 170 nfs_statvfs(struct mount *mp, 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 = NFS_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 = NFS_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(struct nfsmount *nmp, struct vnode *vp, kauth_cred_t cred, struct lwp *l) 263 { 264 struct nfsv3_fsinfo *fsp; 265 char *cp; 266 int32_t t1, t2; 267 u_int32_t *tl, pref, xmax; 268 char *bpos, *dpos, *cp2; 269 int error = 0, retattr; 270 struct mbuf *mreq, *mrep, *md, *mb; 271 u_int64_t maxfsize; 272 struct nfsnode *np = VTONFS(vp); 273 274 nfsstats.rpccnt[NFSPROC_FSINFO]++; 275 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 276 nfsm_fhtom(np, 1); 277 nfsm_request(np, NFSPROC_FSINFO, l, cred); 278 nfsm_postop_attr(vp, retattr, 0); 279 if (!error) { 280 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 281 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 282 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 283 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 284 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 285 ~(NFS_FABLKSIZE - 1); 286 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 287 if (xmax < nmp->nm_wsize && xmax > 0) { 288 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1); 289 if (nmp->nm_wsize == 0) 290 nmp->nm_wsize = xmax; 291 } 292 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 293 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 294 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 295 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 296 ~(NFS_FABLKSIZE - 1); 297 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 298 if (xmax < nmp->nm_rsize && xmax > 0) { 299 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1); 300 if (nmp->nm_rsize == 0) 301 nmp->nm_rsize = xmax; 302 } 303 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 304 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 305 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 306 ~(NFS_DIRFRAGSIZ - 1); 307 if (xmax < nmp->nm_readdirsize && xmax > 0) { 308 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1); 309 if (nmp->nm_readdirsize == 0) 310 nmp->nm_readdirsize = xmax; 311 } 312 /* XXX */ 313 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 314 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 315 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 316 nmp->nm_maxfilesize = maxfsize; 317 nmp->nm_mountp->mnt_fs_bshift = 318 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 319 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 320 } 321 nfsm_reqdone; 322 return (error); 323 } 324 #endif 325 326 /* 327 * Mount a remote root fs via. NFS. It goes like this: 328 * - Call nfs_boot_init() to fill in the nfs_diskless struct 329 * - build the rootfs mount point and call mountnfs() to do the rest. 330 */ 331 int 332 nfs_mountroot(void) 333 { 334 struct timespec ts; 335 struct nfs_diskless *nd; 336 struct vattr attr; 337 struct mount *mp; 338 struct vnode *vp; 339 struct lwp *l; 340 long n; 341 int error; 342 343 l = curlwp; /* XXX */ 344 345 if (device_class(root_device) != DV_IFNET) 346 return (ENODEV); 347 348 /* 349 * XXX time must be non-zero when we init the interface or else 350 * the arp code will wedge. [Fixed now in if_ether.c] 351 * However, the NFS attribute cache gives false "hits" when the 352 * current time < nfs_attrtimeo(nmp, np) so keep this in for now. 353 */ 354 if (time_second < NFS_MAXATTRTIMO) { 355 ts.tv_sec = NFS_MAXATTRTIMO; 356 ts.tv_nsec = 0; 357 tc_setclock(&ts); 358 } 359 360 /* 361 * Call nfs_boot_init() to fill in the nfs_diskless struct. 362 * Side effect: Finds and configures a network interface. 363 */ 364 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP); 365 error = nfs_boot_init(nd, l); 366 if (error) { 367 kmem_free(nd, sizeof(*nd)); 368 return (error); 369 } 370 371 /* 372 * Create the root mount point. 373 */ 374 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); 375 if (error) 376 goto out; 377 printf("root on %s\n", nd->nd_root.ndm_host); 378 379 /* 380 * Link it into the mount list. 381 */ 382 mutex_enter(&mountlist_lock); 383 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 384 mutex_exit(&mountlist_lock); 385 rootvp = vp; 386 mp->mnt_vnodecovered = NULLVP; 387 vfs_unbusy(mp, false, NULL); 388 389 /* Get root attributes (for the time). */ 390 vn_lock(vp, LK_SHARED | LK_RETRY); 391 error = VOP_GETATTR(vp, &attr, l->l_cred); 392 VOP_UNLOCK(vp); 393 if (error) 394 panic("nfs_mountroot: getattr for root"); 395 n = attr.va_atime.tv_sec; 396 #ifdef DEBUG 397 printf("root time: 0x%lx\n", n); 398 #endif 399 setrootfstime(n); 400 401 out: 402 if (error) 403 nfs_boot_cleanup(nd, l); 404 kmem_free(nd, sizeof(*nd)); 405 return (error); 406 } 407 408 /* 409 * Internal version of mount system call for diskless setup. 410 * Separate function because we used to call it twice. 411 * (once for root and once for swap) 412 */ 413 static int 414 nfs_mount_diskless(struct nfs_dlmount *ndmntp, const char *mntname, struct mount **mpp, struct vnode **vpp, struct lwp *l) 415 /* mntname: mount point name */ 416 { 417 struct mount *mp; 418 struct mbuf *m; 419 int error; 420 421 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp); 422 423 mp->mnt_op = &nfs_vfsops; 424 425 /* 426 * Historical practice expects NFS root file systems to 427 * be initially mounted r/w. 428 */ 429 mp->mnt_flag &= ~MNT_RDONLY; 430 431 /* Get mbuf for server sockaddr. */ 432 m = m_get(M_WAIT, MT_SONAME); 433 if (m == NULL) 434 panic("nfs_mountroot: mget soname for %s", mntname); 435 MCLAIM(m, &nfs_mowner); 436 memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr, 437 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 438 439 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 440 ndmntp->ndm_args.hostname, vpp, l); 441 if (error) { 442 vfs_unbusy(mp, false, NULL); 443 vfs_destroy(mp); 444 printf("nfs_mountroot: mount %s failed: %d\n", 445 mntname, error); 446 } else 447 *mpp = mp; 448 449 return (error); 450 } 451 452 void 453 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, struct lwp *l) 454 { 455 int s; 456 int adjsock; 457 int maxio; 458 459 s = splsoftnet(); 460 461 /* 462 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 463 * no sense in that context. 464 */ 465 if (argp->sotype == SOCK_STREAM) 466 argp->flags &= ~NFSMNT_NOCONN; 467 468 /* 469 * Cookie translation is not needed for v2, silently ignore it. 470 */ 471 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 472 NFSMNT_XLATECOOKIE) 473 argp->flags &= ~NFSMNT_XLATECOOKIE; 474 475 /* Re-bind if rsrvd port requested and wasn't on one */ 476 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 477 && (argp->flags & NFSMNT_RESVPORT); 478 /* Also re-bind if we're switching to/from a connected UDP socket */ 479 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 480 (argp->flags & NFSMNT_NOCONN)); 481 482 /* Update flags. */ 483 nmp->nm_flag = argp->flags; 484 splx(s); 485 486 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 487 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 488 if (nmp->nm_timeo < NFS_MINTIMEO) 489 nmp->nm_timeo = NFS_MINTIMEO; 490 else if (nmp->nm_timeo > NFS_MAXTIMEO) 491 nmp->nm_timeo = NFS_MAXTIMEO; 492 } 493 494 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 495 nmp->nm_retry = argp->retrans; 496 if (nmp->nm_retry > NFS_MAXREXMIT) 497 nmp->nm_retry = NFS_MAXREXMIT; 498 } 499 500 #ifndef NFS_V2_ONLY 501 if (argp->flags & NFSMNT_NFSV3) { 502 if (argp->sotype == SOCK_DGRAM) 503 maxio = NFS_MAXDGRAMDATA; 504 else 505 maxio = NFS_MAXDATA; 506 } else 507 #endif 508 maxio = NFS_V2MAXDATA; 509 510 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 511 int osize = nmp->nm_wsize; 512 nmp->nm_wsize = argp->wsize; 513 /* Round down to multiple of blocksize */ 514 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 515 if (nmp->nm_wsize <= 0) 516 nmp->nm_wsize = NFS_FABLKSIZE; 517 adjsock |= (nmp->nm_wsize != osize); 518 } 519 if (nmp->nm_wsize > maxio) 520 nmp->nm_wsize = maxio; 521 if (nmp->nm_wsize > MAXBSIZE) 522 nmp->nm_wsize = MAXBSIZE; 523 524 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 525 int osize = nmp->nm_rsize; 526 nmp->nm_rsize = argp->rsize; 527 /* Round down to multiple of blocksize */ 528 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 529 if (nmp->nm_rsize <= 0) 530 nmp->nm_rsize = NFS_FABLKSIZE; 531 adjsock |= (nmp->nm_rsize != osize); 532 } 533 if (nmp->nm_rsize > maxio) 534 nmp->nm_rsize = maxio; 535 if (nmp->nm_rsize > MAXBSIZE) 536 nmp->nm_rsize = MAXBSIZE; 537 538 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 539 nmp->nm_readdirsize = argp->readdirsize; 540 /* Round down to multiple of minimum blocksize */ 541 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 542 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 543 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 544 /* Bigger than buffer size makes no sense */ 545 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 546 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 547 } else if (argp->flags & NFSMNT_RSIZE) 548 nmp->nm_readdirsize = nmp->nm_rsize; 549 550 if (nmp->nm_readdirsize > maxio) 551 nmp->nm_readdirsize = maxio; 552 553 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 554 argp->maxgrouplist <= NFS_MAXGRPS) 555 nmp->nm_numgrps = argp->maxgrouplist; 556 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 557 argp->readahead <= NFS_MAXRAHEAD) 558 nmp->nm_readahead = argp->readahead; 559 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 560 argp->deadthresh <= NFS_NEVERDEAD) 561 nmp->nm_deadthresh = argp->deadthresh; 562 563 adjsock |= ((nmp->nm_sotype != argp->sotype) || 564 (nmp->nm_soproto != argp->proto)); 565 nmp->nm_sotype = argp->sotype; 566 nmp->nm_soproto = argp->proto; 567 568 if (nmp->nm_so && adjsock) { 569 nfs_safedisconnect(nmp); 570 if (nmp->nm_sotype == SOCK_DGRAM) 571 while (nfs_connect(nmp, (struct nfsreq *)0, l)) { 572 printf("nfs_args: retrying connect\n"); 573 kpause("nfscn3", false, hz, NULL); 574 } 575 } 576 } 577 578 /* 579 * VFS Operations. 580 * 581 * mount system call 582 * It seems a bit dumb to copyinstr() the host and path here and then 583 * memcpy() them in mountnfs(), but I wanted to detect errors before 584 * doing the sockargs() call because sockargs() allocates an mbuf and 585 * an error after that means that I have to release the mbuf. 586 */ 587 /* ARGSUSED */ 588 int 589 nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 590 { 591 struct lwp *l = curlwp; 592 int error; 593 struct nfs_args *args = data; 594 struct mbuf *nam; 595 struct nfsmount *nmp = VFSTONFS(mp); 596 struct sockaddr *sa; 597 struct vnode *vp; 598 char *pth, *hst; 599 size_t len; 600 u_char *nfh; 601 602 if (*data_len < sizeof *args) 603 return EINVAL; 604 605 if (mp->mnt_flag & MNT_GETARGS) { 606 607 if (nmp == NULL) 608 return (EIO); 609 if (args->addr != NULL) { 610 sa = mtod(nmp->nm_nam, struct sockaddr *); 611 error = copyout(sa, args->addr, sa->sa_len); 612 if (error) 613 return (error); 614 args->addrlen = sa->sa_len; 615 } else 616 args->addrlen = 0; 617 618 args->version = NFS_ARGSVERSION; 619 args->sotype = nmp->nm_sotype; 620 args->proto = nmp->nm_soproto; 621 args->fh = NULL; 622 args->fhsize = 0; 623 args->flags = nmp->nm_flag; 624 args->wsize = nmp->nm_wsize; 625 args->rsize = nmp->nm_rsize; 626 args->readdirsize = nmp->nm_readdirsize; 627 args->timeo = nmp->nm_timeo; 628 args->retrans = nmp->nm_retry; 629 args->maxgrouplist = nmp->nm_numgrps; 630 args->readahead = nmp->nm_readahead; 631 args->leaseterm = 0; /* dummy */ 632 args->deadthresh = nmp->nm_deadthresh; 633 args->hostname = NULL; 634 *data_len = sizeof *args; 635 return 0; 636 } 637 638 if (args->version != NFS_ARGSVERSION) 639 return (EPROGMISMATCH); 640 if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB)) 641 return (EPROGUNAVAIL); 642 #ifdef NFS_V2_ONLY 643 if (args->flags & NFSMNT_NFSV3) 644 return (EPROGMISMATCH); 645 #endif 646 if (mp->mnt_flag & MNT_UPDATE) { 647 if (nmp == NULL) 648 return (EIO); 649 /* 650 * When doing an update, we can't change from or to 651 * v3, or change cookie translation 652 */ 653 args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) | 654 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)); 655 nfs_decode_args(nmp, args, l); 656 return (0); 657 } 658 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 659 return (EINVAL); 660 nfh = malloc(NFSX_V3FHMAX, M_TEMP, M_WAITOK); 661 error = copyin(args->fh, nfh, args->fhsize); 662 if (error) 663 goto free_nfh; 664 pth = malloc(MNAMELEN, M_TEMP, M_WAITOK); 665 error = copyinstr(path, pth, MNAMELEN - 1, &len); 666 if (error) 667 goto free_pth; 668 memset(&pth[len], 0, MNAMELEN - len); 669 hst = malloc(MNAMELEN, M_TEMP, M_WAITOK); 670 error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len); 671 if (error) 672 goto free_hst; 673 memset(&hst[len], 0, MNAMELEN - len); 674 /* sockargs() call must be after above copyin() calls */ 675 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME); 676 if (error) 677 goto free_hst; 678 MCLAIM(nam, &nfs_mowner); 679 args->fh = nfh; 680 error = mountnfs(args, mp, nam, pth, hst, &vp, l); 681 682 free_hst: 683 free(hst, M_TEMP); 684 free_pth: 685 free(pth, M_TEMP); 686 free_nfh: 687 free(nfh, M_TEMP); 688 689 return (error); 690 } 691 692 /* 693 * Common code for mount and mountroot 694 */ 695 int 696 mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, const char *pth, const char *hst, struct vnode **vpp, struct lwp *l) 697 { 698 struct nfsmount *nmp; 699 struct nfsnode *np; 700 struct vnode *vp; 701 int error; 702 struct vattr *attrs; 703 kauth_cred_t cr; 704 char iosname[IOSTATNAMELEN]; 705 706 /* 707 * If the number of nfs iothreads to use has never 708 * been set, create a reasonable number of them. 709 */ 710 711 if (nfs_niothreads < 0) { 712 nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS); 713 } 714 715 if (mp->mnt_flag & MNT_UPDATE) { 716 nmp = VFSTONFS(mp); 717 /* update paths, file handles, etc, here XXX */ 718 m_freem(nam); 719 return (0); 720 } else { 721 nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP); 722 mp->mnt_data = nmp; 723 TAILQ_INIT(&nmp->nm_uidlruhead); 724 TAILQ_INIT(&nmp->nm_bufq); 725 rw_init(&nmp->nm_writeverflock); 726 mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE); 727 rw_init(&nmp->nm_rbtlock); 728 cv_init(&nmp->nm_rcvcv, "nfsrcv"); 729 cv_init(&nmp->nm_sndcv, "nfssnd"); 730 cv_init(&nmp->nm_aiocv, "nfsaio"); 731 cv_init(&nmp->nm_disconcv, "nfsdis"); 732 nfs_rbtinit(nmp); 733 } 734 vfs_getnewfsid(mp); 735 nmp->nm_mountp = mp; 736 737 #ifndef NFS_V2_ONLY 738 if ((argp->flags & NFSMNT_NFSV3) == 0) 739 #endif 740 { 741 if (argp->fhsize != NFSX_V2FH) { 742 return EINVAL; 743 } 744 } 745 746 /* 747 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 748 * will overwrite this. 749 */ 750 nmp->nm_maxfilesize = 0xffffffffLL; 751 752 nmp->nm_timeo = NFS_TIMEO; 753 nmp->nm_retry = NFS_RETRANS; 754 nmp->nm_wsize = NFS_WSIZE; 755 nmp->nm_rsize = NFS_RSIZE; 756 nmp->nm_readdirsize = NFS_READDIRSIZE; 757 nmp->nm_numgrps = NFS_MAXGRPS; 758 nmp->nm_readahead = NFS_DEFRAHEAD; 759 nmp->nm_deadthresh = NFS_DEFDEADTHRESH; 760 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, 761 mp->mnt_op->vfs_name, mp, l); 762 if (error) 763 goto bad; 764 nmp->nm_nam = nam; 765 766 /* Set up the sockets and per-host congestion */ 767 nmp->nm_sotype = argp->sotype; 768 nmp->nm_soproto = argp->proto; 769 770 nfs_decode_args(nmp, argp, l); 771 772 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 773 mp->mnt_dev_bshift = DEV_BSHIFT; 774 775 /* 776 * For Connection based sockets (TCP,...) defer the connect until 777 * the first request, in case the server is not responding. 778 */ 779 if (nmp->nm_sotype == SOCK_DGRAM && 780 (error = nfs_connect(nmp, (struct nfsreq *)0, l))) 781 goto bad; 782 783 /* 784 * This is silly, but it has to be set so that vinifod() works. 785 * We do not want to do an nfs_statvfs() here since we can get 786 * stuck on a dead server and we are holding a lock on the mount 787 * point. 788 */ 789 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 790 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 791 if (error) 792 goto bad; 793 vp = NFSTOV(np); 794 attrs = malloc(sizeof(struct vattr), M_TEMP, M_WAITOK); 795 VOP_GETATTR(vp, attrs, l->l_cred); 796 if ((nmp->nm_flag & NFSMNT_NFSV3) && (vp->v_type == VDIR)) { 797 cr = kauth_cred_alloc(); 798 kauth_cred_setuid(cr, attrs->va_uid); 799 kauth_cred_seteuid(cr, attrs->va_uid); 800 kauth_cred_setsvuid(cr, attrs->va_uid); 801 kauth_cred_setgid(cr, attrs->va_gid); 802 kauth_cred_setegid(cr, attrs->va_gid); 803 kauth_cred_setsvgid(cr, attrs->va_gid); 804 nfs_cookieheuristic(vp, &nmp->nm_iflag, l, cr); 805 kauth_cred_free(cr); 806 } 807 free(attrs, M_TEMP); 808 809 /* 810 * A reference count is needed on the nfsnode representing the 811 * remote root. If this object is not persistent, then backward 812 * traversals of the mount point (i.e. "..") will not work if 813 * the nfsnode gets flushed out of the cache. Ufs does not have 814 * this problem, because one can identify root inodes by their 815 * number == UFS_ROOTINO (2). So, just unlock, but no rele. 816 */ 817 818 nmp->nm_vnode = vp; 819 if (vp->v_type == VNON) 820 vp->v_type = VDIR; 821 vp->v_vflag |= VV_ROOT; 822 VOP_UNLOCK(vp); 823 *vpp = vp; 824 825 snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++); 826 nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname); 827 828 return (0); 829 bad: 830 nfs_disconnect(nmp); 831 rw_destroy(&nmp->nm_writeverflock); 832 rw_destroy(&nmp->nm_rbtlock); 833 mutex_destroy(&nmp->nm_lock); 834 cv_destroy(&nmp->nm_rcvcv); 835 cv_destroy(&nmp->nm_sndcv); 836 cv_destroy(&nmp->nm_aiocv); 837 cv_destroy(&nmp->nm_disconcv); 838 kmem_free(nmp, sizeof(*nmp)); 839 m_freem(nam); 840 return (error); 841 } 842 843 /* 844 * unmount system call 845 */ 846 int 847 nfs_unmount(struct mount *mp, int mntflags) 848 { 849 struct nfsmount *nmp; 850 struct vnode *vp; 851 int error, flags = 0; 852 853 if (mntflags & MNT_FORCE) 854 flags |= FORCECLOSE; 855 nmp = VFSTONFS(mp); 856 /* 857 * Goes something like this.. 858 * - Check for activity on the root vnode (other than ourselves). 859 * - Call vflush() to clear out vnodes for this file system, 860 * except for the root vnode. 861 * - Decrement reference on the vnode representing remote root. 862 * - Close the socket 863 * - Free up the data structures 864 */ 865 /* 866 * We need to decrement the ref. count on the nfsnode representing 867 * the remote root. See comment in mountnfs(). 868 */ 869 vp = nmp->nm_vnode; 870 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 871 if (error != 0) 872 return error; 873 874 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 1) { 875 VOP_UNLOCK(vp); 876 return (EBUSY); 877 } 878 879 error = vflush(mp, vp, flags); 880 if (error) { 881 VOP_UNLOCK(vp); 882 return (error); 883 } 884 885 /* 886 * We are now committed to the unmount; mark the mount structure 887 * as doomed so that any sleepers kicked awake by nfs_disconnect 888 * will go away cleanly. 889 */ 890 nmp->nm_iflag |= NFSMNT_DISMNT; 891 892 /* 893 * Clean up the stats... note that we carefully avoid decrementing 894 * nfs_mount_count here for good reason - we may not be unmounting 895 * the last thing mounted. 896 */ 897 iostat_free(nmp->nm_stats); 898 899 /* 900 * There is one reference count to get rid of here 901 * (see comment in mountnfs()). 902 */ 903 VOP_UNLOCK(vp); 904 vgone(vp); 905 nfs_disconnect(nmp); 906 m_freem(nmp->nm_nam); 907 908 rw_destroy(&nmp->nm_writeverflock); 909 rw_destroy(&nmp->nm_rbtlock); 910 mutex_destroy(&nmp->nm_lock); 911 cv_destroy(&nmp->nm_rcvcv); 912 cv_destroy(&nmp->nm_sndcv); 913 cv_destroy(&nmp->nm_aiocv); 914 cv_destroy(&nmp->nm_disconcv); 915 kmem_free(nmp, sizeof(*nmp)); 916 return (0); 917 } 918 919 /* 920 * Return root of a filesystem 921 */ 922 int 923 nfs_root(struct mount *mp, struct vnode **vpp) 924 { 925 struct vnode *vp; 926 struct nfsmount *nmp; 927 int error; 928 929 nmp = VFSTONFS(mp); 930 vp = nmp->nm_vnode; 931 vref(vp); 932 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 933 if (error != 0) { 934 vrele(vp); 935 return error; 936 } 937 *vpp = vp; 938 return (0); 939 } 940 941 extern int syncprt; 942 943 /* 944 * Flush out the buffer cache 945 */ 946 /* ARGSUSED */ 947 int 948 nfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 949 { 950 struct vnode *vp, *mvp; 951 int error, allerror = 0; 952 953 /* 954 * Force stale buffer cache information to be flushed. 955 */ 956 mvp = vnalloc(mp); 957 loop: 958 /* 959 * NOTE: not using the TAILQ_FOREACH here since in this loop vgone() 960 * and vclean() can be called indirectly 961 */ 962 mutex_enter(&mntvnode_lock); 963 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 964 vmark(mvp, vp); 965 if (vp->v_mount != mp || vismarker(vp)) 966 continue; 967 mutex_enter(vp->v_interlock); 968 /* XXX MNT_LAZY cannot be right? */ 969 if (waitfor == MNT_LAZY || 970 (LIST_EMPTY(&vp->v_dirtyblkhd) && 971 UVM_OBJ_IS_CLEAN(&vp->v_uobj))) { 972 mutex_exit(vp->v_interlock); 973 continue; 974 } 975 mutex_exit(&mntvnode_lock); 976 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT); 977 if (error != 0) { 978 if (error != ENOENT) { 979 mutex_enter(&mntvnode_lock); 980 continue; 981 } 982 (void)vunmark(mvp); 983 goto loop; 984 } 985 error = VOP_FSYNC(vp, cred, 986 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); 987 if (error) 988 allerror = error; 989 vput(vp); 990 mutex_enter(&mntvnode_lock); 991 } 992 mutex_exit(&mntvnode_lock); 993 vnfree(mvp); 994 return (allerror); 995 } 996 997 /* 998 * NFS flat namespace lookup. 999 * Currently unsupported. 1000 */ 1001 /* ARGSUSED */ 1002 int 1003 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 1004 { 1005 1006 return (EOPNOTSUPP); 1007 } 1008 1009 /* 1010 * Do that sysctl thang... 1011 */ 1012 static int 1013 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 1014 { 1015 struct sysctlnode node; 1016 int val; 1017 int error; 1018 1019 val = nfs_niothreads; 1020 node = *rnode; 1021 node.sysctl_data = &val; 1022 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1023 if (error || newp == NULL) 1024 return error; 1025 1026 return nfs_set_niothreads(val); 1027 } 1028 1029 static void 1030 nfs_sysctl_init(void) 1031 { 1032 1033 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1034 CTLFLAG_PERMANENT, 1035 CTLTYPE_NODE, "vfs", NULL, 1036 NULL, 0, NULL, 0, 1037 CTL_VFS, CTL_EOL); 1038 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1039 CTLFLAG_PERMANENT, 1040 CTLTYPE_NODE, "nfs", 1041 SYSCTL_DESCR("NFS vfs options"), 1042 NULL, 0, NULL, 0, 1043 CTL_VFS, 2, CTL_EOL); 1044 /* 1045 * XXX the "2" above could be dynamic, thereby eliminating one 1046 * more instance of the "number to vfs" mapping problem, but 1047 * "2" is the order as taken from sys/mount.h 1048 */ 1049 1050 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1051 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1052 CTLTYPE_STRUCT, "nfsstats", 1053 SYSCTL_DESCR("NFS operation statistics"), 1054 NULL, 0, &nfsstats, sizeof(nfsstats), 1055 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1056 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1057 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1058 CTLTYPE_INT, "iothreads", 1059 SYSCTL_DESCR("Number of NFS client processes desired"), 1060 sysctl_vfs_nfs_iothreads, 0, NULL, 0, 1061 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1062 } 1063 1064 static void 1065 nfs_sysctl_fini(void) 1066 { 1067 1068 sysctl_teardown(&nfs_clog); 1069 } 1070 1071 /* ARGSUSED */ 1072 int 1073 nfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 1074 { 1075 size_t fidsize; 1076 size_t fhsize; 1077 struct nfsnode *np; 1078 int error; 1079 struct vattr va; 1080 1081 fidsize = fid->fid_len; 1082 if (fidsize < sizeof(*fid)) { 1083 return EINVAL; 1084 } 1085 fhsize = fidsize - sizeof(*fid); 1086 if ((fhsize % NFSX_UNSIGNED) != 0) { 1087 return EINVAL; 1088 } 1089 if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) { 1090 if (fhsize > NFSX_V3FHMAX || fhsize == 0) { 1091 return EINVAL; 1092 } 1093 } else { 1094 if (fhsize != NFSX_V2FH) { 1095 return EINVAL; 1096 } 1097 } 1098 error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np); 1099 if (error) { 1100 return error; 1101 } 1102 *vpp = NFSTOV(np); 1103 error = VOP_GETATTR(*vpp, &va, kauth_cred_get()); 1104 if (error != 0) { 1105 vput(*vpp); 1106 *vpp = NULLVP; 1107 } 1108 return error; 1109 } 1110 1111 /* ARGSUSED */ 1112 int 1113 nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize) 1114 { 1115 struct nfsnode *np; 1116 struct fid *fid; 1117 size_t fidsize; 1118 int error = 0; 1119 1120 np = VTONFS(vp); 1121 fidsize = sizeof(*fid) + np->n_fhsize; 1122 if (*bufsize < fidsize) { 1123 error = E2BIG; 1124 } 1125 *bufsize = fidsize; 1126 if (error == 0) { 1127 struct fid fid_store; 1128 1129 fid = &fid_store; 1130 memset(fid, 0, sizeof(*fid)); 1131 fid->fid_len = fidsize; 1132 memcpy(buf, fid, sizeof(*fid)); 1133 memcpy(buf->fid_data, np->n_fhp, np->n_fhsize); 1134 } 1135 return error; 1136 } 1137 1138 /* 1139 * Vfs start routine, a no-op. 1140 */ 1141 /* ARGSUSED */ 1142 int 1143 nfs_start(struct mount *mp, int flags) 1144 { 1145 1146 return (0); 1147 } 1148 1149 /* 1150 * Called once at VFS init to initialize client-specific data structures. 1151 */ 1152 void 1153 nfs_vfs_init(void) 1154 { 1155 1156 /* Initialize NFS server / client shared data. */ 1157 nfs_init(); 1158 nfs_node_init(); 1159 1160 /* Initialize the kqueue structures */ 1161 nfs_kqinit(); 1162 /* Initialize the iod structures */ 1163 nfs_iodinit(); 1164 1165 nfs_commitsize = uvmexp.npages << (PAGE_SHIFT - 4); 1166 } 1167 1168 void 1169 nfs_vfs_done(void) 1170 { 1171 1172 nfs_node_done(); 1173 nfs_kqfini(); 1174 nfs_iodfini(); 1175 } 1176