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sys/nfs/nfs_vfsops.c
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1 /* $NetBSD: nfs_vfsops.c,v 1.168 2006/11/09 09:53:57 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 1.168 2006/11/09 09:53:57 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/nqnfs.h> 77 #include <nfs/nfs_var.h> 78 79 extern struct nfsstats nfsstats; 80 extern int nfs_ticks; 81 82 /* 83 * keep a count of the nfs mounts to generate ficticious drive names 84 * for the per drive stats. 85 */ 86 unsigned int nfs_mount_count = 0; 87 88 MALLOC_DEFINE(M_NFSMNT, "NFS mount", "NFS mount structure"); 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 nfs_mount, 108 nfs_start, 109 nfs_unmount, 110 nfs_root, 111 nfs_quotactl, 112 nfs_statvfs, 113 nfs_sync, 114 nfs_vget, 115 nfs_fhtovp, 116 nfs_vptofh, 117 nfs_vfs_init, 118 nfs_vfs_reinit, 119 nfs_vfs_done, 120 nfs_mountroot, 121 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 122 vfs_stdextattrctl, 123 nfs_vnodeopv_descs, 124 0, 125 { NULL, NULL }, 126 }; 127 VFS_ATTACH(nfs_vfsops); 128 129 extern u_int32_t nfs_procids[NFS_NPROCS]; 130 extern u_int32_t nfs_prog, nfs_vers; 131 132 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 133 struct mount **, struct vnode **, struct lwp *)); 134 135 /* 136 * nfs statvfs call 137 */ 138 int 139 nfs_statvfs(mp, sbp, l) 140 struct mount *mp; 141 struct statvfs *sbp; 142 struct lwp *l; 143 { 144 struct vnode *vp; 145 struct nfs_statfs *sfp; 146 caddr_t cp; 147 u_int32_t *tl; 148 int32_t t1, t2; 149 caddr_t bpos, dpos, cp2; 150 struct nfsmount *nmp = VFSTONFS(mp); 151 int error = 0, retattr; 152 #ifdef NFS_V2_ONLY 153 const int v3 = 0; 154 #else 155 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 156 #endif 157 struct mbuf *mreq, *mrep = NULL, *md, *mb; 158 kauth_cred_t cred; 159 u_quad_t tquad; 160 struct nfsnode *np; 161 162 #ifndef nolint 163 sfp = (struct nfs_statfs *)0; 164 #endif 165 vp = nmp->nm_vnode; 166 np = VTONFS(vp); 167 cred = kauth_cred_alloc(); 168 #ifndef NFS_V2_ONLY 169 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 170 (void)nfs_fsinfo(nmp, vp, cred, l); 171 #endif 172 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 173 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 174 nfsm_fhtom(np, v3); 175 nfsm_request(np, NFSPROC_FSSTAT, l, cred); 176 if (v3) 177 nfsm_postop_attr(vp, retattr, 0); 178 if (error) { 179 if (mrep != NULL) { 180 if (mrep->m_next != NULL) 181 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 182 m_freem(mrep); 183 } 184 goto nfsmout; 185 } 186 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 187 sbp->f_flag = nmp->nm_flag; 188 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 189 if (v3) { 190 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 191 tquad = fxdr_hyper(&sfp->sf_tbytes); 192 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 193 tquad = fxdr_hyper(&sfp->sf_fbytes); 194 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 195 tquad = fxdr_hyper(&sfp->sf_abytes); 196 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 197 sbp->f_bresvd = sbp->f_bfree - tquad; 198 sbp->f_bavail = tquad; 199 #ifdef COMPAT_20 200 /* Handle older NFS servers returning negative values */ 201 if ((quad_t)sbp->f_bavail < 0) 202 sbp->f_bavail = 0; 203 #endif 204 tquad = fxdr_hyper(&sfp->sf_tfiles); 205 sbp->f_files = tquad; 206 tquad = fxdr_hyper(&sfp->sf_ffiles); 207 sbp->f_ffree = tquad; 208 sbp->f_favail = tquad; 209 sbp->f_fresvd = 0; 210 sbp->f_namemax = MAXNAMLEN; 211 } else { 212 sbp->f_bsize = NFS_FABLKSIZE; 213 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 214 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 215 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 216 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 217 sbp->f_fresvd = 0; 218 sbp->f_files = 0; 219 sbp->f_ffree = 0; 220 sbp->f_favail = 0; 221 sbp->f_fresvd = 0; 222 sbp->f_namemax = MAXNAMLEN; 223 } 224 copy_statvfs_info(sbp, mp); 225 nfsm_reqdone; 226 kauth_cred_free(cred); 227 return (error); 228 } 229 230 #ifndef NFS_V2_ONLY 231 /* 232 * nfs version 3 fsinfo rpc call 233 */ 234 int 235 nfs_fsinfo(nmp, vp, cred, l) 236 struct nfsmount *nmp; 237 struct vnode *vp; 238 kauth_cred_t cred; 239 struct lwp *l; 240 { 241 struct nfsv3_fsinfo *fsp; 242 caddr_t cp; 243 int32_t t1, t2; 244 u_int32_t *tl, pref, xmax; 245 caddr_t bpos, dpos, cp2; 246 int error = 0, retattr; 247 struct mbuf *mreq, *mrep, *md, *mb; 248 u_int64_t maxfsize; 249 struct nfsnode *np = VTONFS(vp); 250 251 nfsstats.rpccnt[NFSPROC_FSINFO]++; 252 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 253 nfsm_fhtom(np, 1); 254 nfsm_request(np, NFSPROC_FSINFO, l, cred); 255 nfsm_postop_attr(vp, retattr, 0); 256 if (!error) { 257 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 258 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 259 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 260 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 261 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 262 ~(NFS_FABLKSIZE - 1); 263 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 264 if (xmax < nmp->nm_wsize && xmax > 0) { 265 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1); 266 if (nmp->nm_wsize == 0) 267 nmp->nm_wsize = xmax; 268 } 269 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 270 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 271 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 272 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 273 ~(NFS_FABLKSIZE - 1); 274 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 275 if (xmax < nmp->nm_rsize && xmax > 0) { 276 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1); 277 if (nmp->nm_rsize == 0) 278 nmp->nm_rsize = xmax; 279 } 280 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 281 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 282 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 283 ~(NFS_DIRFRAGSIZ - 1); 284 if (xmax < nmp->nm_readdirsize && xmax > 0) { 285 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1); 286 if (nmp->nm_readdirsize == 0) 287 nmp->nm_readdirsize = xmax; 288 } 289 /* XXX */ 290 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 291 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 292 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 293 nmp->nm_maxfilesize = maxfsize; 294 nmp->nm_mountp->mnt_fs_bshift = 295 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 296 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 297 } 298 nfsm_reqdone; 299 return (error); 300 } 301 #endif 302 303 /* 304 * Mount a remote root fs via. NFS. It goes like this: 305 * - Call nfs_boot_init() to fill in the nfs_diskless struct 306 * - build the rootfs mount point and call mountnfs() to do the rest. 307 */ 308 int 309 nfs_mountroot() 310 { 311 #ifdef __HAVE_TIMECOUNTER 312 struct timespec ts; 313 #endif 314 struct nfs_diskless *nd; 315 struct vattr attr; 316 struct mount *mp; 317 struct vnode *vp; 318 struct lwp *l; 319 long n; 320 int error; 321 322 l = curlwp; /* XXX */ 323 324 if (device_class(root_device) != DV_IFNET) 325 return (ENODEV); 326 327 /* 328 * XXX time must be non-zero when we init the interface or else 329 * the arp code will wedge. [Fixed now in if_ether.c] 330 * However, the NFS attribute cache gives false "hits" when the 331 * current time < NFS_ATTRTIMEO(nmp, np) so keep this in for now. 332 */ 333 if (time_second < NFS_MAXATTRTIMO) { 334 #ifdef __HAVE_TIMECOUNTER 335 ts.tv_sec = NFS_MAXATTRTIMO; 336 ts.tv_nsec = 0; 337 tc_setclock(&ts); 338 #else /* !__HAVE_TIMECOUNTER */ 339 time.tv_sec = NFS_MAXATTRTIMO; 340 #endif /* !__HAVE_TIMECOUNTER */ 341 } 342 343 /* 344 * Call nfs_boot_init() to fill in the nfs_diskless struct. 345 * Side effect: Finds and configures a network interface. 346 */ 347 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 348 memset((caddr_t)nd, 0, sizeof(*nd)); 349 error = nfs_boot_init(nd, l); 350 if (error) { 351 free(nd, M_NFSMNT); 352 return (error); 353 } 354 355 /* 356 * Create the root mount point. 357 */ 358 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); 359 if (error) 360 goto out; 361 printf("root on %s\n", nd->nd_root.ndm_host); 362 363 /* 364 * Link it into the mount list. 365 */ 366 simple_lock(&mountlist_slock); 367 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 368 simple_unlock(&mountlist_slock); 369 rootvp = vp; 370 mp->mnt_vnodecovered = NULLVP; 371 vfs_unbusy(mp); 372 373 /* Get root attributes (for the time). */ 374 error = VOP_GETATTR(vp, &attr, l->l_cred, l); 375 if (error) 376 panic("nfs_mountroot: getattr for root"); 377 n = attr.va_atime.tv_sec; 378 #ifdef DEBUG 379 printf("root time: 0x%lx\n", n); 380 #endif 381 setrootfstime(n); 382 383 out: 384 if (error) 385 nfs_boot_cleanup(nd, l); 386 free(nd, M_NFSMNT); 387 return (error); 388 } 389 390 /* 391 * Internal version of mount system call for diskless setup. 392 * Separate function because we used to call it twice. 393 * (once for root and once for swap) 394 */ 395 static int 396 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, l) 397 struct nfs_dlmount *ndmntp; 398 const char *mntname; /* mount point name */ 399 struct mount **mpp; 400 struct vnode **vpp; 401 struct lwp *l; 402 { 403 struct mount *mp; 404 struct mbuf *m; 405 int error; 406 407 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp); 408 409 mp->mnt_op = &nfs_vfsops; 410 411 /* 412 * Historical practice expects NFS root file systems to 413 * be initially mounted r/w. 414 */ 415 mp->mnt_flag &= ~MNT_RDONLY; 416 417 /* Get mbuf for server sockaddr. */ 418 m = m_get(M_WAIT, MT_SONAME); 419 if (m == NULL) 420 panic("nfs_mountroot: mget soname for %s", mntname); 421 MCLAIM(m, &nfs_mowner); 422 memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr, 423 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 424 425 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 426 ndmntp->ndm_args.hostname, vpp, l); 427 if (error) { 428 mp->mnt_op->vfs_refcount--; 429 vfs_unbusy(mp); 430 printf("nfs_mountroot: mount %s failed: %d\n", 431 mntname, error); 432 free(mp, M_MOUNT); 433 } else 434 *mpp = mp; 435 436 return (error); 437 } 438 439 void 440 nfs_decode_args(nmp, argp, l) 441 struct nfsmount *nmp; 442 struct nfs_args *argp; 443 struct lwp *l; 444 { 445 int s; 446 int adjsock; 447 int maxio; 448 449 s = splsoftnet(); 450 451 /* 452 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 453 * no sense in that context. 454 */ 455 if (argp->sotype == SOCK_STREAM) 456 argp->flags &= ~NFSMNT_NOCONN; 457 458 /* 459 * Cookie translation is not needed for v2, silently ignore it. 460 */ 461 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 462 NFSMNT_XLATECOOKIE) 463 argp->flags &= ~NFSMNT_XLATECOOKIE; 464 465 /* Re-bind if rsrvd port requested and wasn't on one */ 466 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 467 && (argp->flags & NFSMNT_RESVPORT); 468 /* Also re-bind if we're switching to/from a connected UDP socket */ 469 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 470 (argp->flags & NFSMNT_NOCONN)); 471 472 /* Update flags. */ 473 nmp->nm_flag = argp->flags; 474 splx(s); 475 476 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 477 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 478 if (nmp->nm_timeo < NFS_MINTIMEO) 479 nmp->nm_timeo = NFS_MINTIMEO; 480 else if (nmp->nm_timeo > NFS_MAXTIMEO) 481 nmp->nm_timeo = NFS_MAXTIMEO; 482 } 483 484 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 485 nmp->nm_retry = argp->retrans; 486 if (nmp->nm_retry > NFS_MAXREXMIT) 487 nmp->nm_retry = NFS_MAXREXMIT; 488 } 489 490 #ifndef NFS_V2_ONLY 491 if (argp->flags & NFSMNT_NFSV3) { 492 if (argp->sotype == SOCK_DGRAM) 493 maxio = NFS_MAXDGRAMDATA; 494 else 495 maxio = NFS_MAXDATA; 496 } else 497 #endif 498 maxio = NFS_V2MAXDATA; 499 500 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 501 int osize = nmp->nm_wsize; 502 nmp->nm_wsize = argp->wsize; 503 /* Round down to multiple of blocksize */ 504 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 505 if (nmp->nm_wsize <= 0) 506 nmp->nm_wsize = NFS_FABLKSIZE; 507 adjsock |= (nmp->nm_wsize != osize); 508 } 509 if (nmp->nm_wsize > maxio) 510 nmp->nm_wsize = maxio; 511 if (nmp->nm_wsize > MAXBSIZE) 512 nmp->nm_wsize = MAXBSIZE; 513 514 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 515 int osize = nmp->nm_rsize; 516 nmp->nm_rsize = argp->rsize; 517 /* Round down to multiple of blocksize */ 518 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 519 if (nmp->nm_rsize <= 0) 520 nmp->nm_rsize = NFS_FABLKSIZE; 521 adjsock |= (nmp->nm_rsize != osize); 522 } 523 if (nmp->nm_rsize > maxio) 524 nmp->nm_rsize = maxio; 525 if (nmp->nm_rsize > MAXBSIZE) 526 nmp->nm_rsize = MAXBSIZE; 527 528 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 529 nmp->nm_readdirsize = argp->readdirsize; 530 /* Round down to multiple of minimum blocksize */ 531 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 532 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 533 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 534 /* Bigger than buffer size makes no sense */ 535 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 536 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 537 } else if (argp->flags & NFSMNT_RSIZE) 538 nmp->nm_readdirsize = nmp->nm_rsize; 539 540 if (nmp->nm_readdirsize > maxio) 541 nmp->nm_readdirsize = maxio; 542 543 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 544 argp->maxgrouplist <= NFS_MAXGRPS) 545 nmp->nm_numgrps = argp->maxgrouplist; 546 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 547 argp->readahead <= NFS_MAXRAHEAD) 548 nmp->nm_readahead = argp->readahead; 549 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 550 argp->leaseterm <= NQ_MAXLEASE) 551 nmp->nm_leaseterm = argp->leaseterm; 552 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 553 argp->deadthresh <= NQ_NEVERDEAD) 554 nmp->nm_deadthresh = argp->deadthresh; 555 556 adjsock |= ((nmp->nm_sotype != argp->sotype) || 557 (nmp->nm_soproto != argp->proto)); 558 nmp->nm_sotype = argp->sotype; 559 nmp->nm_soproto = argp->proto; 560 561 if (nmp->nm_so && adjsock) { 562 nfs_safedisconnect(nmp); 563 if (nmp->nm_sotype == SOCK_DGRAM) 564 while (nfs_connect(nmp, (struct nfsreq *)0, l)) { 565 printf("nfs_args: retrying connect\n"); 566 (void) tsleep((caddr_t)&lbolt, 567 PSOCK, "nfscn3", 0); 568 } 569 } 570 } 571 572 /* 573 * VFS Operations. 574 * 575 * mount system call 576 * It seems a bit dumb to copyinstr() the host and path here and then 577 * memcpy() them in mountnfs(), but I wanted to detect errors before 578 * doing the sockargs() call because sockargs() allocates an mbuf and 579 * an error after that means that I have to release the mbuf. 580 */ 581 /* ARGSUSED */ 582 int 583 nfs_mount(struct mount *mp, const char *path, void *data, struct nameidata *ndp, 584 struct lwp *l) 585 { 586 int error; 587 struct nfs_args args; 588 struct mbuf *nam; 589 struct nfsmount *nmp = VFSTONFS(mp); 590 struct sockaddr *sa; 591 struct vnode *vp; 592 char *pth, *hst; 593 struct proc *p; 594 size_t len; 595 u_char *nfh; 596 597 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 598 if (error) 599 return (error); 600 601 p = l->l_proc; 602 if (mp->mnt_flag & MNT_GETARGS) { 603 604 if (nmp == NULL) 605 return (EIO); 606 if (args.addr != NULL) { 607 sa = mtod(nmp->nm_nam, struct sockaddr *); 608 error = copyout(sa, args.addr, sa->sa_len); 609 if (error) 610 return (error); 611 args.addrlen = sa->sa_len; 612 } else 613 args.addrlen = 0; 614 615 args.version = NFS_ARGSVERSION; 616 args.sotype = nmp->nm_sotype; 617 args.proto = nmp->nm_soproto; 618 args.fh = NULL; 619 args.fhsize = 0; 620 args.flags = nmp->nm_flag; 621 args.wsize = nmp->nm_wsize; 622 args.rsize = nmp->nm_rsize; 623 args.readdirsize = nmp->nm_readdirsize; 624 args.timeo = nmp->nm_timeo; 625 args.retrans = nmp->nm_retry; 626 args.maxgrouplist = nmp->nm_numgrps; 627 args.readahead = nmp->nm_readahead; 628 args.leaseterm = nmp->nm_leaseterm; 629 args.deadthresh = nmp->nm_deadthresh; 630 args.hostname = NULL; 631 return (copyout(&args, data, sizeof(args))); 632 } 633 634 if (args.version != NFS_ARGSVERSION) 635 return (EPROGMISMATCH); 636 #ifdef NFS_V2_ONLY 637 if (args.flags & NFSMNT_NQNFS) 638 return (EPROGUNAVAIL); 639 if (args.flags & NFSMNT_NFSV3) 640 return (EPROGMISMATCH); 641 #endif 642 if (mp->mnt_flag & MNT_UPDATE) { 643 if (nmp == NULL) 644 return (EIO); 645 /* 646 * When doing an update, we can't change from or to 647 * v3 and/or nqnfs, or change cookie translation 648 */ 649 args.flags = (args.flags & 650 ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) | 651 (nmp->nm_flag & 652 (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)); 653 nfs_decode_args(nmp, &args, l); 654 return (0); 655 } 656 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 657 return (EINVAL); 658 MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK); 659 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 660 if (error) 661 return (error); 662 MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK); 663 error = copyinstr(path, pth, MNAMELEN - 1, &len); 664 if (error) 665 goto free_nfh; 666 memset(&pth[len], 0, MNAMELEN - len); 667 MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK); 668 error = copyinstr(args.hostname, hst, MNAMELEN - 1, &len); 669 if (error) 670 goto free_pth; 671 memset(&hst[len], 0, MNAMELEN - len); 672 /* sockargs() call must be after above copyin() calls */ 673 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 674 if (error) 675 goto free_hst; 676 MCLAIM(nam, &nfs_mowner); 677 args.fh = nfh; 678 error = mountnfs(&args, mp, nam, pth, hst, &vp, l); 679 680 free_hst: 681 FREE(hst, M_TEMP); 682 free_pth: 683 FREE(pth, M_TEMP); 684 free_nfh: 685 FREE(nfh, M_TEMP); 686 687 return (error); 688 } 689 690 /* 691 * Common code for mount and mountroot 692 */ 693 int 694 mountnfs(argp, mp, nam, pth, hst, vpp, l) 695 struct nfs_args *argp; 696 struct mount *mp; 697 struct mbuf *nam; 698 const char *pth, *hst; 699 struct vnode **vpp; 700 struct lwp *l; 701 { 702 struct nfsmount *nmp; 703 struct nfsnode *np; 704 int error; 705 struct vattr *attrs; 706 kauth_cred_t cr; 707 char iosname[IOSTATNAMELEN]; 708 709 /* 710 * If the number of nfs iothreads to use has never 711 * been set, create a reasonable number of them. 712 */ 713 714 if (nfs_niothreads < 0) { 715 nfs_niothreads = NFS_DEFAULT_NIOTHREADS; 716 nfs_getset_niothreads(TRUE); 717 } 718 719 if (mp->mnt_flag & MNT_UPDATE) { 720 nmp = VFSTONFS(mp); 721 /* update paths, file handles, etc, here XXX */ 722 m_freem(nam); 723 return (0); 724 } else { 725 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 726 M_NFSMNT, M_WAITOK); 727 memset((caddr_t)nmp, 0, sizeof (struct nfsmount)); 728 mp->mnt_data = nmp; 729 TAILQ_INIT(&nmp->nm_uidlruhead); 730 TAILQ_INIT(&nmp->nm_bufq); 731 lockinit(&nmp->nm_writeverflock, PRIBIO, "nfswverf", 0, 0); 732 simple_lock_init(&nmp->nm_slock); 733 } 734 vfs_getnewfsid(mp); 735 nmp->nm_mountp = mp; 736 737 #ifndef NFS_V2_ONLY 738 if (argp->flags & NFSMNT_NQNFS) 739 mp->mnt_iflag |= IMNT_DTYPE; 740 #endif 741 742 #ifndef NFS_V2_ONLY 743 if ((argp->flags & NFSMNT_NFSV3) == 0) 744 #endif 745 { 746 /* 747 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 748 * will fill this in. 749 */ 750 nmp->nm_maxfilesize = 0xffffffffLL; 751 if (argp->fhsize != NFSX_V2FH) { 752 return EINVAL; 753 } 754 } 755 756 nmp->nm_timeo = NFS_TIMEO; 757 nmp->nm_retry = NFS_RETRANS; 758 nmp->nm_wsize = NFS_WSIZE; 759 nmp->nm_rsize = NFS_RSIZE; 760 nmp->nm_readdirsize = NFS_READDIRSIZE; 761 nmp->nm_numgrps = NFS_MAXGRPS; 762 nmp->nm_readahead = NFS_DEFRAHEAD; 763 nmp->nm_leaseterm = NQ_DEFLEASE; 764 nmp->nm_deadthresh = NQ_DEADTHRESH; 765 CIRCLEQ_INIT(&nmp->nm_timerhead); 766 nmp->nm_inprog = NULLVP; 767 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, mp, l); 768 if (error) 769 goto bad; 770 nmp->nm_nam = nam; 771 772 /* Set up the sockets and per-host congestion */ 773 nmp->nm_sotype = argp->sotype; 774 nmp->nm_soproto = argp->proto; 775 776 nfs_decode_args(nmp, argp, l); 777 778 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 779 mp->mnt_dev_bshift = DEV_BSHIFT; 780 781 /* 782 * For Connection based sockets (TCP,...) defer the connect until 783 * the first request, in case the server is not responding. 784 */ 785 if (nmp->nm_sotype == SOCK_DGRAM && 786 (error = nfs_connect(nmp, (struct nfsreq *)0, l))) 787 goto bad; 788 789 /* 790 * This is silly, but it has to be set so that vinifod() works. 791 * We do not want to do an nfs_statvfs() here since we can get 792 * stuck on a dead server and we are holding a lock on the mount 793 * point. 794 */ 795 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 796 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 797 if (error) 798 goto bad; 799 *vpp = NFSTOV(np); 800 MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK); 801 VOP_GETATTR(*vpp, attrs, l->l_cred, l); 802 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 803 cr = kauth_cred_alloc(); 804 kauth_cred_setuid(cr, attrs->va_uid); 805 kauth_cred_seteuid(cr, attrs->va_uid); 806 kauth_cred_setsvuid(cr, attrs->va_uid); 807 kauth_cred_setgid(cr, attrs->va_gid); 808 kauth_cred_setegid(cr, attrs->va_gid); 809 kauth_cred_setsvgid(cr, attrs->va_gid); 810 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, l, cr); 811 kauth_cred_free(cr); 812 } 813 FREE(attrs, M_TEMP); 814 815 /* 816 * A reference count is needed on the nfsnode representing the 817 * remote root. If this object is not persistent, then backward 818 * traversals of the mount point (i.e. "..") will not work if 819 * the nfsnode gets flushed out of the cache. Ufs does not have 820 * this problem, because one can identify root inodes by their 821 * number == ROOTINO (2). So, just unlock, but no rele. 822 */ 823 824 nmp->nm_vnode = *vpp; 825 VOP_UNLOCK(*vpp, 0); 826 827 snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++); 828 nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname); 829 830 return (0); 831 bad: 832 nfs_disconnect(nmp); 833 free((caddr_t)nmp, M_NFSMNT); 834 m_freem(nam); 835 return (error); 836 } 837 838 /* 839 * unmount system call 840 */ 841 int 842 nfs_unmount(struct mount *mp, int mntflags, struct lwp *l) 843 { 844 struct nfsmount *nmp; 845 struct vnode *vp; 846 int error, flags = 0; 847 848 if (mntflags & MNT_FORCE) 849 flags |= FORCECLOSE; 850 nmp = VFSTONFS(mp); 851 /* 852 * Goes something like this.. 853 * - Check for activity on the root vnode (other than ourselves). 854 * - Call vflush() to clear out vnodes for this file system, 855 * except for the root vnode. 856 * - Decrement reference on the vnode representing remote root. 857 * - Close the socket 858 * - Free up the data structures 859 */ 860 /* 861 * We need to decrement the ref. count on the nfsnode representing 862 * the remote root. See comment in mountnfs(). The VFS unmount() 863 * has done vput on this vnode, otherwise we would get deadlock! 864 */ 865 vp = nmp->nm_vnode; 866 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 867 if (error != 0) 868 return error; 869 870 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 871 vput(vp); 872 return (EBUSY); 873 } 874 875 /* 876 * Must handshake with nqnfs_clientd() if it is active. 877 */ 878 nmp->nm_iflag |= NFSMNT_DISMINPROG; 879 while (nmp->nm_inprog != NULLVP) 880 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 881 error = vflush(mp, vp, flags); 882 if (error) { 883 vput(vp); 884 nmp->nm_iflag &= ~NFSMNT_DISMINPROG; 885 return (error); 886 } 887 888 /* 889 * We are now committed to the unmount; mark the mount structure 890 * as doomed so that any sleepers kicked awake by nfs_disconnect 891 * will go away cleanly. 892 */ 893 nmp->nm_iflag |= NFSMNT_DISMNT; 894 895 /* 896 * Clean up the stats... note that we carefully avoid decrementing 897 * nfs_mount_count here for good reason - we may not be unmounting 898 * the last thing mounted. 899 */ 900 iostat_free(nmp->nm_stats); 901 902 /* 903 * There are two reference counts to get rid of here 904 * (see comment in mountnfs()). 905 */ 906 vrele(vp); 907 vput(vp); 908 vgone(vp); 909 nfs_disconnect(nmp); 910 m_freem(nmp->nm_nam); 911 912 /* 913 * For NQNFS, let the server daemon free the nfsmount structure. 914 */ 915 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 916 free((caddr_t)nmp, M_NFSMNT); 917 return (0); 918 } 919 920 /* 921 * Return root of a filesystem 922 */ 923 int 924 nfs_root(mp, vpp) 925 struct mount *mp; 926 struct vnode **vpp; 927 { 928 struct vnode *vp; 929 struct nfsmount *nmp; 930 int error; 931 932 nmp = VFSTONFS(mp); 933 vp = nmp->nm_vnode; 934 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 935 if (error != 0) 936 return error; 937 if (vp->v_type == VNON) 938 vp->v_type = VDIR; 939 vp->v_flag = VROOT; 940 *vpp = vp; 941 return (0); 942 } 943 944 extern int syncprt; 945 946 /* 947 * Flush out the buffer cache 948 */ 949 /* ARGSUSED */ 950 int 951 nfs_sync(mp, waitfor, cred, l) 952 struct mount *mp; 953 int waitfor; 954 kauth_cred_t cred; 955 struct lwp *l; 956 { 957 struct vnode *vp, *nvp; 958 int error, allerror = 0; 959 960 /* 961 * Force stale buffer cache information to be flushed. 962 */ 963 loop: 964 /* 965 * NOTE: not using the TAILQ_FOREACH here since in this loop vgone() 966 * and vclean() can be called indirectly 967 */ 968 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = nvp) { 969 /* 970 * If the vnode that we are about to sync is no longer 971 * associated with this mount point, start over. 972 */ 973 if (vp->v_mount != mp) 974 goto loop; 975 nvp = TAILQ_NEXT(vp, v_mntvnodes); 976 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 977 (LIST_EMPTY(&vp->v_dirtyblkhd) && 978 vp->v_uobj.uo_npages == 0)) 979 continue; 980 if (vget(vp, LK_EXCLUSIVE)) 981 goto loop; 982 error = VOP_FSYNC(vp, cred, 983 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, l); 984 if (error) 985 allerror = error; 986 vput(vp); 987 } 988 return (allerror); 989 } 990 991 /* 992 * NFS flat namespace lookup. 993 * Currently unsupported. 994 */ 995 /* ARGSUSED */ 996 int 997 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 998 { 999 1000 return (EOPNOTSUPP); 1001 } 1002 1003 /* 1004 * Do that sysctl thang... 1005 */ 1006 static int 1007 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 1008 { 1009 int error; 1010 1011 nfs_getset_niothreads(0); 1012 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1013 if (error || newp == NULL) 1014 return (error); 1015 nfs_getset_niothreads(1); 1016 1017 return (0); 1018 } 1019 1020 SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup") 1021 { 1022 1023 sysctl_createv(clog, 0, NULL, NULL, 1024 CTLFLAG_PERMANENT, 1025 CTLTYPE_NODE, "vfs", NULL, 1026 NULL, 0, NULL, 0, 1027 CTL_VFS, CTL_EOL); 1028 sysctl_createv(clog, 0, NULL, NULL, 1029 CTLFLAG_PERMANENT, 1030 CTLTYPE_NODE, "nfs", 1031 SYSCTL_DESCR("NFS vfs options"), 1032 NULL, 0, NULL, 0, 1033 CTL_VFS, 2, CTL_EOL); 1034 /* 1035 * XXX the "2" above could be dynamic, thereby eliminating one 1036 * more instance of the "number to vfs" mapping problem, but 1037 * "2" is the order as taken from sys/mount.h 1038 */ 1039 1040 sysctl_createv(clog, 0, NULL, NULL, 1041 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1042 CTLTYPE_STRUCT, "nfsstats", 1043 SYSCTL_DESCR("NFS operation statistics"), 1044 NULL, 0, &nfsstats, sizeof(nfsstats), 1045 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1046 sysctl_createv(clog, 0, NULL, NULL, 1047 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1048 CTLTYPE_INT, "iothreads", 1049 SYSCTL_DESCR("Number of NFS client processes desired"), 1050 sysctl_vfs_nfs_iothreads, 0, &nfs_niothreads, 0, 1051 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1052 } 1053 1054 /* ARGSUSED */ 1055 int 1056 nfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 1057 { 1058 size_t fidsize; 1059 size_t fhsize; 1060 struct nfsnode *np; 1061 int error; 1062 struct vattr va; 1063 1064 fidsize = fid->fid_len; 1065 if (fidsize < sizeof(*fid)) { 1066 return EINVAL; 1067 } 1068 fhsize = fidsize - sizeof(*fid); 1069 if ((fhsize % NFSX_UNSIGNED) != 0) { 1070 return EINVAL; 1071 } 1072 if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) { 1073 if (fhsize > NFSX_V3FHMAX || fhsize == 0) { 1074 return EINVAL; 1075 } 1076 } else { 1077 if (fhsize != NFSX_V2FH) { 1078 return EINVAL; 1079 } 1080 } 1081 error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np); 1082 if (error) { 1083 return error; 1084 } 1085 *vpp = NFSTOV(np); 1086 error = VOP_GETATTR(*vpp, &va, kauth_cred_get(), curlwp); 1087 if (error != 0) { 1088 vput(*vpp); 1089 } 1090 return error; 1091 } 1092 1093 /* ARGSUSED */ 1094 int 1095 nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize) 1096 { 1097 struct nfsnode *np; 1098 struct fid *fid; 1099 size_t fidsize; 1100 int error = 0; 1101 1102 np = VTONFS(vp); 1103 fidsize = sizeof(*fid) + np->n_fhsize; 1104 if (*bufsize < fidsize) { 1105 error = E2BIG; 1106 } 1107 *bufsize = fidsize; 1108 if (error == 0) { 1109 struct fid fid_store; 1110 1111 fid = &fid_store; 1112 memset(fid, 0, sizeof(*fid)); 1113 fid->fid_len = fidsize; 1114 memcpy(buf, fid, sizeof(*fid)); 1115 memcpy(buf->fid_data, np->n_fhp, np->n_fhsize); 1116 } 1117 return error; 1118 } 1119 1120 /* 1121 * Vfs start routine, a no-op. 1122 */ 1123 /* ARGSUSED */ 1124 int 1125 nfs_start(struct mount *mp, int flags, struct lwp *l) 1126 { 1127 1128 return (0); 1129 } 1130 1131 /* 1132 * Do operations associated with quotas, not supported 1133 */ 1134 /* ARGSUSED */ 1135 int 1136 nfs_quotactl(struct mount *mp, int cmd, uid_t uid, void *arg, struct lwp *l) 1137 { 1138 1139 return (EOPNOTSUPP); 1140 }
Cache object: 69918e8bcd999c3ce61a5a8a819ae4a8
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