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sys/nfs/nfs_vfsops.c
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1 /* $NetBSD: nfs_vfsops.c,v 1.203 2008/10/22 12:29:35 matt 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 1.203 2008/10/22 12:29:35 matt 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 #include <sys/module.h> 64 65 #include <net/if.h> 66 #include <net/route.h> 67 #include <netinet/in.h> 68 69 #include <nfs/rpcv2.h> 70 #include <nfs/nfsproto.h> 71 #include <nfs/nfsnode.h> 72 #include <nfs/nfs.h> 73 #include <nfs/nfsmount.h> 74 #include <nfs/xdr_subs.h> 75 #include <nfs/nfsm_subs.h> 76 #include <nfs/nfsdiskless.h> 77 #include <nfs/nfs_var.h> 78 79 MODULE(MODULE_CLASS_VFS, nfs, NULL); 80 81 extern struct nfsstats nfsstats; 82 extern int nfs_ticks; 83 84 /* 85 * keep a count of the nfs mounts to generate ficticious drive names 86 * for the per drive stats. 87 */ 88 unsigned int nfs_mount_count = 0; 89 90 /* 91 * nfs vfs operations. 92 */ 93 94 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 95 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 96 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 97 98 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 99 &nfsv2_vnodeop_opv_desc, 100 &spec_nfsv2nodeop_opv_desc, 101 &fifo_nfsv2nodeop_opv_desc, 102 NULL, 103 }; 104 105 struct vfsops nfs_vfsops = { 106 MOUNT_NFS, 107 sizeof (struct nfs_args), 108 nfs_mount, 109 nfs_start, 110 nfs_unmount, 111 nfs_root, 112 (void *)eopnotsupp, /* vfs_quotactl */ 113 nfs_statvfs, 114 nfs_sync, 115 nfs_vget, 116 nfs_fhtovp, 117 nfs_vptofh, 118 nfs_vfs_init, 119 NULL, 120 nfs_vfs_done, 121 nfs_mountroot, 122 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 123 vfs_stdextattrctl, 124 (void *)eopnotsupp, /* vfs_suspendctl */ 125 genfs_renamelock_enter, 126 genfs_renamelock_exit, 127 (void *)eopnotsupp, 128 nfs_vnodeopv_descs, 129 0, 130 { NULL, NULL }, 131 }; 132 133 static int 134 nfs_modcmd(modcmd_t cmd, void *arg) 135 { 136 137 switch (cmd) { 138 case MODULE_CMD_INIT: 139 return vfs_attach(&nfs_vfsops); 140 case MODULE_CMD_FINI: 141 return vfs_detach(&nfs_vfsops); 142 default: 143 return ENOTTY; 144 } 145 } 146 147 extern u_int32_t nfs_procids[NFS_NPROCS]; 148 extern u_int32_t nfs_prog, nfs_vers; 149 150 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 151 struct mount **, struct vnode **, struct lwp *)); 152 153 /* 154 * nfs statvfs call 155 */ 156 int 157 nfs_statvfs(mp, sbp) 158 struct mount *mp; 159 struct statvfs *sbp; 160 { 161 struct lwp *l = curlwp; 162 struct vnode *vp; 163 struct nfs_statfs *sfp; 164 char *cp; 165 u_int32_t *tl; 166 int32_t t1, t2; 167 char *bpos, *dpos, *cp2; 168 struct nfsmount *nmp = VFSTONFS(mp); 169 int error = 0, retattr; 170 #ifdef NFS_V2_ONLY 171 const int v3 = 0; 172 #else 173 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 174 #endif 175 struct mbuf *mreq, *mrep = NULL, *md, *mb; 176 kauth_cred_t cred; 177 u_quad_t tquad; 178 struct nfsnode *np; 179 180 #ifndef nolint 181 sfp = (struct nfs_statfs *)0; 182 #endif 183 vp = nmp->nm_vnode; 184 np = VTONFS(vp); 185 cred = kauth_cred_alloc(); 186 #ifndef NFS_V2_ONLY 187 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 188 (void)nfs_fsinfo(nmp, vp, cred, l); 189 #endif 190 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 191 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 192 nfsm_fhtom(np, v3); 193 nfsm_request(np, NFSPROC_FSSTAT, l, cred); 194 if (v3) 195 nfsm_postop_attr(vp, retattr, 0); 196 if (error) { 197 if (mrep != NULL) { 198 if (mrep->m_next != NULL) 199 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 200 m_freem(mrep); 201 } 202 goto nfsmout; 203 } 204 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 205 sbp->f_flag = nmp->nm_flag; 206 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 207 if (v3) { 208 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 209 tquad = fxdr_hyper(&sfp->sf_tbytes); 210 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 211 tquad = fxdr_hyper(&sfp->sf_fbytes); 212 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 213 tquad = fxdr_hyper(&sfp->sf_abytes); 214 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 215 sbp->f_bresvd = sbp->f_bfree - tquad; 216 sbp->f_bavail = tquad; 217 #ifdef COMPAT_20 218 /* Handle older NFS servers returning negative values */ 219 if ((quad_t)sbp->f_bavail < 0) 220 sbp->f_bavail = 0; 221 #endif 222 tquad = fxdr_hyper(&sfp->sf_tfiles); 223 sbp->f_files = tquad; 224 tquad = fxdr_hyper(&sfp->sf_ffiles); 225 sbp->f_ffree = tquad; 226 sbp->f_favail = tquad; 227 sbp->f_fresvd = 0; 228 sbp->f_namemax = MAXNAMLEN; 229 } else { 230 sbp->f_bsize = NFS_FABLKSIZE; 231 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 232 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 233 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 234 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 235 sbp->f_fresvd = 0; 236 sbp->f_files = 0; 237 sbp->f_ffree = 0; 238 sbp->f_favail = 0; 239 sbp->f_fresvd = 0; 240 sbp->f_namemax = MAXNAMLEN; 241 } 242 copy_statvfs_info(sbp, mp); 243 nfsm_reqdone; 244 kauth_cred_free(cred); 245 return (error); 246 } 247 248 #ifndef NFS_V2_ONLY 249 /* 250 * nfs version 3 fsinfo rpc call 251 */ 252 int 253 nfs_fsinfo(nmp, vp, cred, l) 254 struct nfsmount *nmp; 255 struct vnode *vp; 256 kauth_cred_t cred; 257 struct lwp *l; 258 { 259 struct nfsv3_fsinfo *fsp; 260 char *cp; 261 int32_t t1, t2; 262 u_int32_t *tl, pref, xmax; 263 char *bpos, *dpos, *cp2; 264 int error = 0, retattr; 265 struct mbuf *mreq, *mrep, *md, *mb; 266 u_int64_t maxfsize; 267 struct nfsnode *np = VTONFS(vp); 268 269 nfsstats.rpccnt[NFSPROC_FSINFO]++; 270 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 271 nfsm_fhtom(np, 1); 272 nfsm_request(np, NFSPROC_FSINFO, l, cred); 273 nfsm_postop_attr(vp, retattr, 0); 274 if (!error) { 275 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 276 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 277 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 278 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 279 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 280 ~(NFS_FABLKSIZE - 1); 281 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 282 if (xmax < nmp->nm_wsize && xmax > 0) { 283 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1); 284 if (nmp->nm_wsize == 0) 285 nmp->nm_wsize = xmax; 286 } 287 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 288 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 289 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 290 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 291 ~(NFS_FABLKSIZE - 1); 292 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 293 if (xmax < nmp->nm_rsize && xmax > 0) { 294 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1); 295 if (nmp->nm_rsize == 0) 296 nmp->nm_rsize = xmax; 297 } 298 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 299 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 300 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 301 ~(NFS_DIRFRAGSIZ - 1); 302 if (xmax < nmp->nm_readdirsize && xmax > 0) { 303 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1); 304 if (nmp->nm_readdirsize == 0) 305 nmp->nm_readdirsize = xmax; 306 } 307 /* XXX */ 308 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 309 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 310 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 311 nmp->nm_maxfilesize = maxfsize; 312 nmp->nm_mountp->mnt_fs_bshift = 313 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 314 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 315 } 316 nfsm_reqdone; 317 return (error); 318 } 319 #endif 320 321 /* 322 * Mount a remote root fs via. NFS. It goes like this: 323 * - Call nfs_boot_init() to fill in the nfs_diskless struct 324 * - build the rootfs mount point and call mountnfs() to do the rest. 325 */ 326 int 327 nfs_mountroot() 328 { 329 struct timespec ts; 330 struct nfs_diskless *nd; 331 struct vattr attr; 332 struct mount *mp; 333 struct vnode *vp; 334 struct lwp *l; 335 long n; 336 int error; 337 338 l = curlwp; /* XXX */ 339 340 if (device_class(root_device) != DV_IFNET) 341 return (ENODEV); 342 343 /* 344 * XXX time must be non-zero when we init the interface or else 345 * the arp code will wedge. [Fixed now in if_ether.c] 346 * However, the NFS attribute cache gives false "hits" when the 347 * current time < nfs_attrtimeo(nmp, np) so keep this in for now. 348 */ 349 if (time_second < NFS_MAXATTRTIMO) { 350 ts.tv_sec = NFS_MAXATTRTIMO; 351 ts.tv_nsec = 0; 352 tc_setclock(&ts); 353 } 354 355 /* 356 * Call nfs_boot_init() to fill in the nfs_diskless struct. 357 * Side effect: Finds and configures a network interface. 358 */ 359 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP); 360 error = nfs_boot_init(nd, l); 361 if (error) { 362 kmem_free(nd, sizeof(*nd)); 363 return (error); 364 } 365 366 /* 367 * Create the root mount point. 368 */ 369 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); 370 if (error) 371 goto out; 372 printf("root on %s\n", nd->nd_root.ndm_host); 373 374 /* 375 * Link it into the mount list. 376 */ 377 mutex_enter(&mountlist_lock); 378 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 379 mutex_exit(&mountlist_lock); 380 rootvp = vp; 381 mp->mnt_vnodecovered = NULLVP; 382 vfs_unbusy(mp, false, NULL); 383 384 /* Get root attributes (for the time). */ 385 error = VOP_GETATTR(vp, &attr, l->l_cred); 386 if (error) 387 panic("nfs_mountroot: getattr for root"); 388 n = attr.va_atime.tv_sec; 389 #ifdef DEBUG 390 printf("root time: 0x%lx\n", n); 391 #endif 392 setrootfstime(n); 393 394 out: 395 if (error) 396 nfs_boot_cleanup(nd, l); 397 kmem_free(nd, sizeof(*nd)); 398 return (error); 399 } 400 401 /* 402 * Internal version of mount system call for diskless setup. 403 * Separate function because we used to call it twice. 404 * (once for root and once for swap) 405 */ 406 static int 407 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, l) 408 struct nfs_dlmount *ndmntp; 409 const char *mntname; /* mount point name */ 410 struct mount **mpp; 411 struct vnode **vpp; 412 struct lwp *l; 413 { 414 struct mount *mp; 415 struct mbuf *m; 416 int error; 417 418 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp); 419 420 mp->mnt_op = &nfs_vfsops; 421 422 /* 423 * Historical practice expects NFS root file systems to 424 * be initially mounted r/w. 425 */ 426 mp->mnt_flag &= ~MNT_RDONLY; 427 428 /* Get mbuf for server sockaddr. */ 429 m = m_get(M_WAIT, MT_SONAME); 430 if (m == NULL) 431 panic("nfs_mountroot: mget soname for %s", mntname); 432 MCLAIM(m, &nfs_mowner); 433 memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr, 434 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 435 436 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 437 ndmntp->ndm_args.hostname, vpp, l); 438 if (error) { 439 vfs_unbusy(mp, false, NULL); 440 vfs_destroy(mp); 441 printf("nfs_mountroot: mount %s failed: %d\n", 442 mntname, error); 443 } else 444 *mpp = mp; 445 446 return (error); 447 } 448 449 void 450 nfs_decode_args(nmp, argp, l) 451 struct nfsmount *nmp; 452 struct nfs_args *argp; 453 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 struct proc *p; 600 size_t len; 601 u_char *nfh; 602 603 if (*data_len < sizeof *args) 604 return EINVAL; 605 606 p = l->l_proc; 607 if (mp->mnt_flag & MNT_GETARGS) { 608 609 if (nmp == NULL) 610 return (EIO); 611 if (args->addr != NULL) { 612 sa = mtod(nmp->nm_nam, struct sockaddr *); 613 error = copyout(sa, args->addr, sa->sa_len); 614 if (error) 615 return (error); 616 args->addrlen = sa->sa_len; 617 } else 618 args->addrlen = 0; 619 620 args->version = NFS_ARGSVERSION; 621 args->sotype = nmp->nm_sotype; 622 args->proto = nmp->nm_soproto; 623 args->fh = NULL; 624 args->fhsize = 0; 625 args->flags = nmp->nm_flag; 626 args->wsize = nmp->nm_wsize; 627 args->rsize = nmp->nm_rsize; 628 args->readdirsize = nmp->nm_readdirsize; 629 args->timeo = nmp->nm_timeo; 630 args->retrans = nmp->nm_retry; 631 args->maxgrouplist = nmp->nm_numgrps; 632 args->readahead = nmp->nm_readahead; 633 args->leaseterm = 0; /* dummy */ 634 args->deadthresh = nmp->nm_deadthresh; 635 args->hostname = NULL; 636 *data_len = sizeof *args; 637 return 0; 638 } 639 640 if (args->version != NFS_ARGSVERSION) 641 return (EPROGMISMATCH); 642 if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB)) 643 return (EPROGUNAVAIL); 644 #ifdef NFS_V2_ONLY 645 if (args->flags & NFSMNT_NFSV3) 646 return (EPROGMISMATCH); 647 #endif 648 if (mp->mnt_flag & MNT_UPDATE) { 649 if (nmp == NULL) 650 return (EIO); 651 /* 652 * When doing an update, we can't change from or to 653 * v3, or change cookie translation 654 */ 655 args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) | 656 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)); 657 nfs_decode_args(nmp, args, l); 658 return (0); 659 } 660 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 661 return (EINVAL); 662 MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK); 663 error = copyin(args->fh, nfh, args->fhsize); 664 if (error) 665 goto free_nfh; 666 MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK); 667 error = copyinstr(path, pth, MNAMELEN - 1, &len); 668 if (error) 669 goto free_pth; 670 memset(&pth[len], 0, MNAMELEN - len); 671 MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK); 672 error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len); 673 if (error) 674 goto free_hst; 675 memset(&hst[len], 0, MNAMELEN - len); 676 /* sockargs() call must be after above copyin() calls */ 677 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME); 678 if (error) 679 goto free_hst; 680 MCLAIM(nam, &nfs_mowner); 681 args->fh = nfh; 682 error = mountnfs(args, mp, nam, pth, hst, &vp, l); 683 684 free_hst: 685 FREE(hst, M_TEMP); 686 free_pth: 687 FREE(pth, M_TEMP); 688 free_nfh: 689 FREE(nfh, M_TEMP); 690 691 return (error); 692 } 693 694 /* 695 * Common code for mount and mountroot 696 */ 697 int 698 mountnfs(argp, mp, nam, pth, hst, vpp, l) 699 struct nfs_args *argp; 700 struct mount *mp; 701 struct mbuf *nam; 702 const char *pth, *hst; 703 struct vnode **vpp; 704 struct lwp *l; 705 { 706 struct nfsmount *nmp; 707 struct nfsnode *np; 708 struct vnode *vp; 709 int error; 710 struct vattr *attrs; 711 kauth_cred_t cr; 712 char iosname[IOSTATNAMELEN]; 713 714 /* 715 * If the number of nfs iothreads to use has never 716 * been set, create a reasonable number of them. 717 */ 718 719 if (nfs_niothreads < 0) { 720 nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS); 721 } 722 723 if (mp->mnt_flag & MNT_UPDATE) { 724 nmp = VFSTONFS(mp); 725 /* update paths, file handles, etc, here XXX */ 726 m_freem(nam); 727 return (0); 728 } else { 729 nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP); 730 mp->mnt_data = nmp; 731 TAILQ_INIT(&nmp->nm_uidlruhead); 732 TAILQ_INIT(&nmp->nm_bufq); 733 rw_init(&nmp->nm_writeverflock); 734 mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE); 735 rw_init(&nmp->nm_rbtlock); 736 cv_init(&nmp->nm_rcvcv, "nfsrcv"); 737 cv_init(&nmp->nm_sndcv, "nfssnd"); 738 cv_init(&nmp->nm_aiocv, "nfsaio"); 739 cv_init(&nmp->nm_disconcv, "nfsdis"); 740 nfs_rbtinit(nmp); 741 } 742 vfs_getnewfsid(mp); 743 nmp->nm_mountp = mp; 744 745 #ifndef NFS_V2_ONLY 746 if ((argp->flags & NFSMNT_NFSV3) == 0) 747 #endif 748 { 749 if (argp->fhsize != NFSX_V2FH) { 750 return EINVAL; 751 } 752 } 753 754 /* 755 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 756 * will overwrite this. 757 */ 758 nmp->nm_maxfilesize = 0xffffffffLL; 759 760 nmp->nm_timeo = NFS_TIMEO; 761 nmp->nm_retry = NFS_RETRANS; 762 nmp->nm_wsize = NFS_WSIZE; 763 nmp->nm_rsize = NFS_RSIZE; 764 nmp->nm_readdirsize = NFS_READDIRSIZE; 765 nmp->nm_numgrps = NFS_MAXGRPS; 766 nmp->nm_readahead = NFS_DEFRAHEAD; 767 nmp->nm_deadthresh = NFS_DEFDEADTHRESH; 768 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, 769 mp->mnt_op->vfs_name, mp, l); 770 if (error) 771 goto bad; 772 nmp->nm_nam = nam; 773 774 /* Set up the sockets and per-host congestion */ 775 nmp->nm_sotype = argp->sotype; 776 nmp->nm_soproto = argp->proto; 777 778 nfs_decode_args(nmp, argp, l); 779 780 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 781 mp->mnt_dev_bshift = DEV_BSHIFT; 782 783 /* 784 * For Connection based sockets (TCP,...) defer the connect until 785 * the first request, in case the server is not responding. 786 */ 787 if (nmp->nm_sotype == SOCK_DGRAM && 788 (error = nfs_connect(nmp, (struct nfsreq *)0, l))) 789 goto bad; 790 791 /* 792 * This is silly, but it has to be set so that vinifod() works. 793 * We do not want to do an nfs_statvfs() here since we can get 794 * stuck on a dead server and we are holding a lock on the mount 795 * point. 796 */ 797 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 798 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 799 if (error) 800 goto bad; 801 vp = NFSTOV(np); 802 MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK); 803 VOP_GETATTR(vp, attrs, l->l_cred); 804 if ((nmp->nm_flag & NFSMNT_NFSV3) && (vp->v_type == VDIR)) { 805 cr = kauth_cred_alloc(); 806 kauth_cred_setuid(cr, attrs->va_uid); 807 kauth_cred_seteuid(cr, attrs->va_uid); 808 kauth_cred_setsvuid(cr, attrs->va_uid); 809 kauth_cred_setgid(cr, attrs->va_gid); 810 kauth_cred_setegid(cr, attrs->va_gid); 811 kauth_cred_setsvgid(cr, attrs->va_gid); 812 nfs_cookieheuristic(vp, &nmp->nm_iflag, l, cr); 813 kauth_cred_free(cr); 814 } 815 FREE(attrs, M_TEMP); 816 817 /* 818 * A reference count is needed on the nfsnode representing the 819 * remote root. If this object is not persistent, then backward 820 * traversals of the mount point (i.e. "..") will not work if 821 * the nfsnode gets flushed out of the cache. Ufs does not have 822 * this problem, because one can identify root inodes by their 823 * number == ROOTINO (2). So, just unlock, but no rele. 824 */ 825 826 nmp->nm_vnode = vp; 827 if (vp->v_type == VNON) 828 vp->v_type = VDIR; 829 vp->v_vflag |= VV_ROOT; 830 VOP_UNLOCK(vp, 0); 831 *vpp = vp; 832 833 snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++); 834 nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname); 835 836 return (0); 837 bad: 838 nfs_disconnect(nmp); 839 rw_destroy(&nmp->nm_writeverflock); 840 rw_destroy(&nmp->nm_rbtlock); 841 mutex_destroy(&nmp->nm_lock); 842 cv_destroy(&nmp->nm_rcvcv); 843 cv_destroy(&nmp->nm_sndcv); 844 cv_destroy(&nmp->nm_aiocv); 845 cv_destroy(&nmp->nm_disconcv); 846 kmem_free(nmp, sizeof(*nmp)); 847 m_freem(nam); 848 return (error); 849 } 850 851 /* 852 * unmount system call 853 */ 854 int 855 nfs_unmount(struct mount *mp, int mntflags) 856 { 857 struct nfsmount *nmp; 858 struct vnode *vp; 859 int error, flags = 0; 860 861 if (mntflags & MNT_FORCE) 862 flags |= FORCECLOSE; 863 nmp = VFSTONFS(mp); 864 /* 865 * Goes something like this.. 866 * - Check for activity on the root vnode (other than ourselves). 867 * - Call vflush() to clear out vnodes for this file system, 868 * except for the root vnode. 869 * - Decrement reference on the vnode representing remote root. 870 * - Close the socket 871 * - Free up the data structures 872 */ 873 /* 874 * We need to decrement the ref. count on the nfsnode representing 875 * the remote root. See comment in mountnfs(). The VFS unmount() 876 * has done vput on this vnode, otherwise we would get deadlock! 877 */ 878 vp = nmp->nm_vnode; 879 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 880 if (error != 0) 881 return error; 882 883 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 884 vput(vp); 885 return (EBUSY); 886 } 887 888 error = vflush(mp, vp, flags); 889 if (error) { 890 vput(vp); 891 return (error); 892 } 893 894 /* 895 * We are now committed to the unmount; mark the mount structure 896 * as doomed so that any sleepers kicked awake by nfs_disconnect 897 * will go away cleanly. 898 */ 899 nmp->nm_iflag |= NFSMNT_DISMNT; 900 901 /* 902 * Clean up the stats... note that we carefully avoid decrementing 903 * nfs_mount_count here for good reason - we may not be unmounting 904 * the last thing mounted. 905 */ 906 iostat_free(nmp->nm_stats); 907 908 /* 909 * There are two reference counts to get rid of here 910 * (see comment in mountnfs()). 911 */ 912 vput(vp); 913 vgone(vp); 914 nfs_disconnect(nmp); 915 m_freem(nmp->nm_nam); 916 917 rw_destroy(&nmp->nm_writeverflock); 918 rw_destroy(&nmp->nm_rbtlock); 919 mutex_destroy(&nmp->nm_lock); 920 cv_destroy(&nmp->nm_rcvcv); 921 cv_destroy(&nmp->nm_sndcv); 922 cv_destroy(&nmp->nm_aiocv); 923 cv_destroy(&nmp->nm_disconcv); 924 kmem_free(nmp, sizeof(*nmp)); 925 return (0); 926 } 927 928 /* 929 * Return root of a filesystem 930 */ 931 int 932 nfs_root(mp, vpp) 933 struct mount *mp; 934 struct vnode **vpp; 935 { 936 struct vnode *vp; 937 struct nfsmount *nmp; 938 int error; 939 940 nmp = VFSTONFS(mp); 941 vp = nmp->nm_vnode; 942 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 943 if (error != 0) 944 return error; 945 *vpp = vp; 946 return (0); 947 } 948 949 extern int syncprt; 950 951 /* 952 * Flush out the buffer cache 953 */ 954 /* ARGSUSED */ 955 int 956 nfs_sync(mp, waitfor, cred) 957 struct mount *mp; 958 int waitfor; 959 kauth_cred_t cred; 960 { 961 struct vnode *vp, *mvp; 962 int error, allerror = 0; 963 964 /* 965 * Force stale buffer cache information to be flushed. 966 */ 967 if ((mvp = vnalloc(mp)) == NULL) 968 return (ENOMEM); 969 loop: 970 /* 971 * NOTE: not using the TAILQ_FOREACH here since in this loop vgone() 972 * and vclean() can be called indirectly 973 */ 974 mutex_enter(&mntvnode_lock); 975 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 976 vmark(mvp, vp); 977 if (vp->v_mount != mp || vismarker(vp)) 978 continue; 979 mutex_enter(&vp->v_interlock); 980 /* XXX MNT_LAZY cannot be right? */ 981 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 982 (LIST_EMPTY(&vp->v_dirtyblkhd) && 983 UVM_OBJ_IS_CLEAN(&vp->v_uobj))) { 984 mutex_exit(&vp->v_interlock); 985 continue; 986 } 987 mutex_exit(&mntvnode_lock); 988 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) { 989 (void)vunmark(mvp); 990 goto loop; 991 } 992 error = VOP_FSYNC(vp, cred, 993 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); 994 if (error) 995 allerror = error; 996 vput(vp); 997 mutex_enter(&mntvnode_lock); 998 } 999 mutex_exit(&mntvnode_lock); 1000 vnfree(mvp); 1001 return (allerror); 1002 } 1003 1004 /* 1005 * NFS flat namespace lookup. 1006 * Currently unsupported. 1007 */ 1008 /* ARGSUSED */ 1009 int 1010 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 1011 { 1012 1013 return (EOPNOTSUPP); 1014 } 1015 1016 /* 1017 * Do that sysctl thang... 1018 */ 1019 static int 1020 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 1021 { 1022 struct sysctlnode node; 1023 int val; 1024 int error; 1025 1026 val = nfs_niothreads; 1027 node = *rnode; 1028 node.sysctl_data = &val; 1029 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1030 if (error || newp == NULL) 1031 return error; 1032 1033 return nfs_set_niothreads(val); 1034 } 1035 1036 SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup") 1037 { 1038 1039 sysctl_createv(clog, 0, NULL, NULL, 1040 CTLFLAG_PERMANENT, 1041 CTLTYPE_NODE, "vfs", NULL, 1042 NULL, 0, NULL, 0, 1043 CTL_VFS, CTL_EOL); 1044 sysctl_createv(clog, 0, NULL, NULL, 1045 CTLFLAG_PERMANENT, 1046 CTLTYPE_NODE, "nfs", 1047 SYSCTL_DESCR("NFS vfs options"), 1048 NULL, 0, NULL, 0, 1049 CTL_VFS, 2, CTL_EOL); 1050 /* 1051 * XXX the "2" above could be dynamic, thereby eliminating one 1052 * more instance of the "number to vfs" mapping problem, but 1053 * "2" is the order as taken from sys/mount.h 1054 */ 1055 1056 sysctl_createv(clog, 0, NULL, NULL, 1057 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1058 CTLTYPE_STRUCT, "nfsstats", 1059 SYSCTL_DESCR("NFS operation statistics"), 1060 NULL, 0, &nfsstats, sizeof(nfsstats), 1061 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1062 sysctl_createv(clog, 0, NULL, NULL, 1063 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1064 CTLTYPE_INT, "iothreads", 1065 SYSCTL_DESCR("Number of NFS client processes desired"), 1066 sysctl_vfs_nfs_iothreads, 0, NULL, 0, 1067 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1068 } 1069 1070 /* ARGSUSED */ 1071 int 1072 nfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 1073 { 1074 size_t fidsize; 1075 size_t fhsize; 1076 struct nfsnode *np; 1077 int error; 1078 struct vattr va; 1079 1080 fidsize = fid->fid_len; 1081 if (fidsize < sizeof(*fid)) { 1082 return EINVAL; 1083 } 1084 fhsize = fidsize - sizeof(*fid); 1085 if ((fhsize % NFSX_UNSIGNED) != 0) { 1086 return EINVAL; 1087 } 1088 if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) { 1089 if (fhsize > NFSX_V3FHMAX || fhsize == 0) { 1090 return EINVAL; 1091 } 1092 } else { 1093 if (fhsize != NFSX_V2FH) { 1094 return EINVAL; 1095 } 1096 } 1097 error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np); 1098 if (error) { 1099 return error; 1100 } 1101 *vpp = NFSTOV(np); 1102 error = VOP_GETATTR(*vpp, &va, kauth_cred_get()); 1103 if (error != 0) { 1104 vput(*vpp); 1105 } 1106 return error; 1107 } 1108 1109 /* ARGSUSED */ 1110 int 1111 nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize) 1112 { 1113 struct nfsnode *np; 1114 struct fid *fid; 1115 size_t fidsize; 1116 int error = 0; 1117 1118 np = VTONFS(vp); 1119 fidsize = sizeof(*fid) + np->n_fhsize; 1120 if (*bufsize < fidsize) { 1121 error = E2BIG; 1122 } 1123 *bufsize = fidsize; 1124 if (error == 0) { 1125 struct fid fid_store; 1126 1127 fid = &fid_store; 1128 memset(fid, 0, sizeof(*fid)); 1129 fid->fid_len = fidsize; 1130 memcpy(buf, fid, sizeof(*fid)); 1131 memcpy(buf->fid_data, np->n_fhp, np->n_fhsize); 1132 } 1133 return error; 1134 } 1135 1136 /* 1137 * Vfs start routine, a no-op. 1138 */ 1139 /* ARGSUSED */ 1140 int 1141 nfs_start(struct mount *mp, int flags) 1142 { 1143 1144 return (0); 1145 }
Cache object: 4453181ad3942eb0ed9144dcd3e3b3fa
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