1 /* $NetBSD: nfs_vfsops.c,v 1.143 2004/08/15 07:19:54 mycroft 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 1.143 2004/08/15 07:19:54 mycroft 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 62 #include <net/if.h> 63 #include <net/route.h> 64 #include <netinet/in.h> 65 66 #include <nfs/rpcv2.h> 67 #include <nfs/nfsproto.h> 68 #include <nfs/nfsnode.h> 69 #include <nfs/nfs.h> 70 #include <nfs/nfsmount.h> 71 #include <nfs/xdr_subs.h> 72 #include <nfs/nfsm_subs.h> 73 #include <nfs/nfsdiskless.h> 74 #include <nfs/nqnfs.h> 75 #include <nfs/nfs_var.h> 76 77 extern struct nfsstats nfsstats; 78 extern int nfs_ticks; 79 80 MALLOC_DEFINE(M_NFSMNT, "NFS mount", "NFS mount structure"); 81 82 /* 83 * nfs vfs operations. 84 */ 85 86 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 87 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 88 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 89 90 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 91 &nfsv2_vnodeop_opv_desc, 92 &spec_nfsv2nodeop_opv_desc, 93 &fifo_nfsv2nodeop_opv_desc, 94 NULL, 95 }; 96 97 struct vfsops nfs_vfsops = { 98 MOUNT_NFS, 99 nfs_mount, 100 nfs_start, 101 nfs_unmount, 102 nfs_root, 103 nfs_quotactl, 104 nfs_statvfs, 105 nfs_sync, 106 nfs_vget, 107 nfs_fhtovp, 108 nfs_vptofh, 109 nfs_vfs_init, 110 nfs_vfs_reinit, 111 nfs_vfs_done, 112 NULL, 113 nfs_mountroot, 114 nfs_checkexp, 115 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 116 nfs_vnodeopv_descs, 117 }; 118 119 extern u_int32_t nfs_procids[NFS_NPROCS]; 120 extern u_int32_t nfs_prog, nfs_vers; 121 122 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 123 struct mount **, struct vnode **, struct proc *)); 124 125 /* 126 * nfs statvfs call 127 */ 128 int 129 nfs_statvfs(mp, sbp, p) 130 struct mount *mp; 131 struct statvfs *sbp; 132 struct proc *p; 133 { 134 struct vnode *vp; 135 struct nfs_statfs *sfp; 136 caddr_t cp; 137 u_int32_t *tl; 138 int32_t t1, t2; 139 caddr_t bpos, dpos, cp2; 140 struct nfsmount *nmp = VFSTONFS(mp); 141 int error = 0, retattr; 142 #ifdef NFS_V2_ONLY 143 const int v3 = 0; 144 #else 145 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 146 #endif 147 struct mbuf *mreq, *mrep = NULL, *md, *mb; 148 struct ucred *cred; 149 u_quad_t tquad; 150 struct nfsnode *np; 151 152 #ifndef nolint 153 sfp = (struct nfs_statfs *)0; 154 #endif 155 vp = nmp->nm_vnode; 156 np = VTONFS(vp); 157 cred = crget(); 158 cred->cr_ngroups = 0; 159 #ifndef NFS_V2_ONLY 160 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 161 (void)nfs_fsinfo(nmp, vp, cred, p); 162 #endif 163 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 164 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 165 nfsm_fhtom(np, v3); 166 nfsm_request(np, NFSPROC_FSSTAT, p, cred); 167 if (v3) 168 nfsm_postop_attr(vp, retattr, 0); 169 if (error) { 170 if (mrep != NULL) { 171 if (mrep->m_next != NULL) 172 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 173 m_freem(mrep); 174 } 175 goto nfsmout; 176 } 177 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 178 sbp->f_flag = nmp->nm_flag; 179 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 180 if (v3) { 181 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 182 tquad = fxdr_hyper(&sfp->sf_tbytes); 183 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 184 tquad = fxdr_hyper(&sfp->sf_fbytes); 185 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 186 tquad = fxdr_hyper(&sfp->sf_abytes); 187 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 188 sbp->f_bresvd = sbp->f_bfree - tquad; 189 sbp->f_bavail = tquad; 190 #ifdef COMPAT_20 191 /* Handle older NFS servers returning negative values */ 192 if ((quad_t)sbp->f_bavail < 0) 193 sbp->f_bavail = 0; 194 #endif 195 tquad = fxdr_hyper(&sfp->sf_tfiles); 196 sbp->f_files = tquad; 197 tquad = fxdr_hyper(&sfp->sf_ffiles); 198 sbp->f_ffree = tquad; 199 sbp->f_favail = tquad; 200 sbp->f_fresvd = 0; 201 sbp->f_namemax = MAXNAMLEN; 202 } else { 203 sbp->f_bsize = NFS_FABLKSIZE; 204 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 205 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 206 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 207 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 208 sbp->f_fresvd = 0; 209 sbp->f_files = 0; 210 sbp->f_ffree = 0; 211 sbp->f_favail = 0; 212 sbp->f_fresvd = 0; 213 sbp->f_namemax = MAXNAMLEN; 214 } 215 copy_statvfs_info(sbp, mp); 216 nfsm_reqdone; 217 crfree(cred); 218 return (error); 219 } 220 221 #ifndef NFS_V2_ONLY 222 /* 223 * nfs version 3 fsinfo rpc call 224 */ 225 int 226 nfs_fsinfo(nmp, vp, cred, p) 227 struct nfsmount *nmp; 228 struct vnode *vp; 229 struct ucred *cred; 230 struct proc *p; 231 { 232 struct nfsv3_fsinfo *fsp; 233 caddr_t cp; 234 int32_t t1, t2; 235 u_int32_t *tl, pref, max; 236 caddr_t bpos, dpos, cp2; 237 int error = 0, retattr; 238 struct mbuf *mreq, *mrep, *md, *mb; 239 u_int64_t maxfsize; 240 struct nfsnode *np = VTONFS(vp); 241 242 nfsstats.rpccnt[NFSPROC_FSINFO]++; 243 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 244 nfsm_fhtom(np, 1); 245 nfsm_request(np, NFSPROC_FSINFO, p, cred); 246 nfsm_postop_attr(vp, retattr, 0); 247 if (!error) { 248 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 249 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 250 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 251 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 252 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 253 ~(NFS_FABLKSIZE - 1); 254 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 255 if (max < nmp->nm_wsize && max > 0) { 256 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 257 if (nmp->nm_wsize == 0) 258 nmp->nm_wsize = max; 259 } 260 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 261 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 262 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 263 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 264 ~(NFS_FABLKSIZE - 1); 265 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 266 if (max < nmp->nm_rsize && max > 0) { 267 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 268 if (nmp->nm_rsize == 0) 269 nmp->nm_rsize = max; 270 } 271 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 272 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 273 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 274 ~(NFS_DIRFRAGSIZ - 1); 275 if (max < nmp->nm_readdirsize && max > 0) { 276 nmp->nm_readdirsize = max & ~(NFS_DIRFRAGSIZ - 1); 277 if (nmp->nm_readdirsize == 0) 278 nmp->nm_readdirsize = max; 279 } 280 /* XXX */ 281 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 282 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 283 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 284 nmp->nm_maxfilesize = maxfsize; 285 nmp->nm_mountp->mnt_fs_bshift = 286 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 287 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 288 } 289 nfsm_reqdone; 290 return (error); 291 } 292 #endif 293 294 /* 295 * Mount a remote root fs via. NFS. It goes like this: 296 * - Call nfs_boot_init() to fill in the nfs_diskless struct 297 * - build the rootfs mount point and call mountnfs() to do the rest. 298 */ 299 int 300 nfs_mountroot() 301 { 302 struct nfs_diskless *nd; 303 struct vattr attr; 304 struct mount *mp; 305 struct vnode *vp; 306 struct proc *procp; 307 long n; 308 int error; 309 310 procp = curproc; /* XXX */ 311 312 if (root_device->dv_class != DV_IFNET) 313 return (ENODEV); 314 315 /* 316 * XXX time must be non-zero when we init the interface or else 317 * the arp code will wedge. [Fixed now in if_ether.c] 318 * However, the NFS attribute cache gives false "hits" when 319 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 320 */ 321 if (time.tv_sec < NFS_MAXATTRTIMO) 322 time.tv_sec = NFS_MAXATTRTIMO; 323 324 /* 325 * Call nfs_boot_init() to fill in the nfs_diskless struct. 326 * Side effect: Finds and configures a network interface. 327 */ 328 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 329 memset((caddr_t)nd, 0, sizeof(*nd)); 330 error = nfs_boot_init(nd, procp); 331 if (error) { 332 free(nd, M_NFSMNT); 333 return (error); 334 } 335 336 /* 337 * Create the root mount point. 338 */ 339 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, procp); 340 if (error) 341 goto out; 342 printf("root on %s\n", nd->nd_root.ndm_host); 343 344 /* 345 * Link it into the mount list. 346 */ 347 simple_lock(&mountlist_slock); 348 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 349 simple_unlock(&mountlist_slock); 350 rootvp = vp; 351 mp->mnt_vnodecovered = NULLVP; 352 vfs_unbusy(mp); 353 354 /* Get root attributes (for the time). */ 355 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 356 if (error) 357 panic("nfs_mountroot: getattr for root"); 358 n = attr.va_atime.tv_sec; 359 #ifdef DEBUG 360 printf("root time: 0x%lx\n", n); 361 #endif 362 setrootfstime(n); 363 364 out: 365 if (error) 366 nfs_boot_cleanup(nd, procp); 367 free(nd, M_NFSMNT); 368 return (error); 369 } 370 371 /* 372 * Internal version of mount system call for diskless setup. 373 * Separate function because we used to call it twice. 374 * (once for root and once for swap) 375 */ 376 static int 377 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, p) 378 struct nfs_dlmount *ndmntp; 379 const char *mntname; /* mount point name */ 380 struct mount **mpp; 381 struct vnode **vpp; 382 struct proc *p; 383 { 384 struct mount *mp; 385 struct mbuf *m; 386 int error; 387 388 vfs_rootmountalloc(MOUNT_NFS, (char *)mntname, &mp); 389 390 mp->mnt_op = &nfs_vfsops; 391 392 /* 393 * Historical practice expects NFS root file systems to 394 * be initially mounted r/w. 395 */ 396 mp->mnt_flag &= ~MNT_RDONLY; 397 398 /* Get mbuf for server sockaddr. */ 399 m = m_get(M_WAIT, MT_SONAME); 400 if (m == NULL) 401 panic("nfs_mountroot: mget soname for %s", mntname); 402 MCLAIM(m, &nfs_mowner); 403 memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr, 404 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 405 406 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 407 ndmntp->ndm_args.hostname, vpp, p); 408 if (error) { 409 mp->mnt_op->vfs_refcount--; 410 vfs_unbusy(mp); 411 printf("nfs_mountroot: mount %s failed: %d\n", 412 mntname, error); 413 free(mp, M_MOUNT); 414 } else 415 *mpp = mp; 416 417 return (error); 418 } 419 420 void 421 nfs_decode_args(nmp, argp, p) 422 struct nfsmount *nmp; 423 struct nfs_args *argp; 424 struct proc *p; 425 { 426 int s; 427 int adjsock; 428 int maxio; 429 430 s = splsoftnet(); 431 432 /* 433 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 434 * no sense in that context. 435 */ 436 if (argp->sotype == SOCK_STREAM) 437 argp->flags &= ~NFSMNT_NOCONN; 438 439 /* 440 * Cookie translation is not needed for v2, silently ignore it. 441 */ 442 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 443 NFSMNT_XLATECOOKIE) 444 argp->flags &= ~NFSMNT_XLATECOOKIE; 445 446 /* Re-bind if rsrvd port requested and wasn't on one */ 447 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 448 && (argp->flags & NFSMNT_RESVPORT); 449 /* Also re-bind if we're switching to/from a connected UDP socket */ 450 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 451 (argp->flags & NFSMNT_NOCONN)); 452 453 /* Update flags. */ 454 nmp->nm_flag = argp->flags; 455 splx(s); 456 457 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 458 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 459 if (nmp->nm_timeo < NFS_MINTIMEO) 460 nmp->nm_timeo = NFS_MINTIMEO; 461 else if (nmp->nm_timeo > NFS_MAXTIMEO) 462 nmp->nm_timeo = NFS_MAXTIMEO; 463 } 464 465 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 466 nmp->nm_retry = argp->retrans; 467 if (nmp->nm_retry > NFS_MAXREXMIT) 468 nmp->nm_retry = NFS_MAXREXMIT; 469 } 470 471 #ifndef NFS_V2_ONLY 472 if (argp->flags & NFSMNT_NFSV3) { 473 if (argp->sotype == SOCK_DGRAM) 474 maxio = NFS_MAXDGRAMDATA; 475 else 476 maxio = NFS_MAXDATA; 477 } else 478 #endif 479 maxio = NFS_V2MAXDATA; 480 481 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 482 int osize = nmp->nm_wsize; 483 nmp->nm_wsize = argp->wsize; 484 /* Round down to multiple of blocksize */ 485 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 486 if (nmp->nm_wsize <= 0) 487 nmp->nm_wsize = NFS_FABLKSIZE; 488 adjsock |= (nmp->nm_wsize != osize); 489 } 490 if (nmp->nm_wsize > maxio) 491 nmp->nm_wsize = maxio; 492 if (nmp->nm_wsize > MAXBSIZE) 493 nmp->nm_wsize = MAXBSIZE; 494 495 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 496 int osize = nmp->nm_rsize; 497 nmp->nm_rsize = argp->rsize; 498 /* Round down to multiple of blocksize */ 499 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 500 if (nmp->nm_rsize <= 0) 501 nmp->nm_rsize = NFS_FABLKSIZE; 502 adjsock |= (nmp->nm_rsize != osize); 503 } 504 if (nmp->nm_rsize > maxio) 505 nmp->nm_rsize = maxio; 506 if (nmp->nm_rsize > MAXBSIZE) 507 nmp->nm_rsize = MAXBSIZE; 508 509 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 510 nmp->nm_readdirsize = argp->readdirsize; 511 /* Round down to multiple of minimum blocksize */ 512 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 513 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 514 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 515 /* Bigger than buffer size makes no sense */ 516 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 517 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 518 } else if (argp->flags & NFSMNT_RSIZE) 519 nmp->nm_readdirsize = nmp->nm_rsize; 520 521 if (nmp->nm_readdirsize > maxio) 522 nmp->nm_readdirsize = maxio; 523 524 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 525 argp->maxgrouplist <= NFS_MAXGRPS) 526 nmp->nm_numgrps = argp->maxgrouplist; 527 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 528 argp->readahead <= NFS_MAXRAHEAD) 529 nmp->nm_readahead = argp->readahead; 530 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 531 argp->leaseterm <= NQ_MAXLEASE) 532 nmp->nm_leaseterm = argp->leaseterm; 533 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 534 argp->deadthresh <= NQ_NEVERDEAD) 535 nmp->nm_deadthresh = argp->deadthresh; 536 537 adjsock |= ((nmp->nm_sotype != argp->sotype) || 538 (nmp->nm_soproto != argp->proto)); 539 nmp->nm_sotype = argp->sotype; 540 nmp->nm_soproto = argp->proto; 541 542 if (nmp->nm_so && adjsock) { 543 nfs_safedisconnect(nmp); 544 if (nmp->nm_sotype == SOCK_DGRAM) 545 while (nfs_connect(nmp, (struct nfsreq *)0, p)) { 546 printf("nfs_args: retrying connect\n"); 547 (void) tsleep((caddr_t)&lbolt, 548 PSOCK, "nfscn3", 0); 549 } 550 } 551 } 552 553 /* 554 * VFS Operations. 555 * 556 * mount system call 557 * It seems a bit dumb to copyinstr() the host and path here and then 558 * memcpy() them in mountnfs(), but I wanted to detect errors before 559 * doing the sockargs() call because sockargs() allocates an mbuf and 560 * an error after that means that I have to release the mbuf. 561 */ 562 /* ARGSUSED */ 563 int 564 nfs_mount(mp, path, data, ndp, p) 565 struct mount *mp; 566 const char *path; 567 void *data; 568 struct nameidata *ndp; 569 struct proc *p; 570 { 571 int error; 572 struct nfs_args args; 573 struct mbuf *nam; 574 struct nfsmount *nmp = VFSTONFS(mp); 575 struct sockaddr *sa; 576 struct vnode *vp; 577 char *pth, *hst; 578 size_t len; 579 u_char *nfh; 580 581 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 582 if (error) 583 return (error); 584 585 if (mp->mnt_flag & MNT_GETARGS) { 586 587 if (nmp == NULL) 588 return (EIO); 589 if (args.addr != NULL) { 590 sa = mtod(nmp->nm_nam, struct sockaddr *); 591 error = copyout(sa, args.addr, sa->sa_len); 592 if (error) 593 return (error); 594 args.addrlen = sa->sa_len; 595 } else 596 args.addrlen = 0; 597 598 args.version = NFS_ARGSVERSION; 599 args.sotype = nmp->nm_sotype; 600 args.proto = nmp->nm_soproto; 601 args.fh = NULL; 602 args.fhsize = 0; 603 args.flags = nmp->nm_flag; 604 args.wsize = nmp->nm_wsize; 605 args.rsize = nmp->nm_rsize; 606 args.readdirsize = nmp->nm_readdirsize; 607 args.timeo = nmp->nm_timeo; 608 args.retrans = nmp->nm_retry; 609 args.maxgrouplist = nmp->nm_numgrps; 610 args.readahead = nmp->nm_readahead; 611 args.leaseterm = nmp->nm_leaseterm; 612 args.deadthresh = nmp->nm_deadthresh; 613 args.hostname = NULL; 614 return (copyout(&args, data, sizeof(args))); 615 } 616 617 if (args.version != NFS_ARGSVERSION) 618 return (EPROGMISMATCH); 619 #ifdef NFS_V2_ONLY 620 if (args.flags & NFSMNT_NQNFS) 621 return (EPROGUNAVAIL); 622 if (args.flags & NFSMNT_NFSV3) 623 return (EPROGMISMATCH); 624 #endif 625 if (mp->mnt_flag & MNT_UPDATE) { 626 if (nmp == NULL) 627 return (EIO); 628 /* 629 * When doing an update, we can't change from or to 630 * v3 and/or nqnfs, or change cookie translation 631 */ 632 args.flags = (args.flags & 633 ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) | 634 (nmp->nm_flag & 635 (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)); 636 nfs_decode_args(nmp, &args, p); 637 return (0); 638 } 639 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 640 return (EINVAL); 641 MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK); 642 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 643 if (error) 644 return (error); 645 MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK); 646 error = copyinstr(path, pth, MNAMELEN - 1, &len); 647 if (error) 648 goto free_nfh; 649 memset(&pth[len], 0, MNAMELEN - len); 650 MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK); 651 error = copyinstr(args.hostname, hst, MNAMELEN - 1, &len); 652 if (error) 653 goto free_pth; 654 memset(&hst[len], 0, MNAMELEN - len); 655 /* sockargs() call must be after above copyin() calls */ 656 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 657 if (error) 658 goto free_hst; 659 MCLAIM(nam, &nfs_mowner); 660 args.fh = nfh; 661 error = mountnfs(&args, mp, nam, pth, hst, &vp, p); 662 663 free_hst: 664 FREE(hst, M_TEMP); 665 free_pth: 666 FREE(pth, M_TEMP); 667 free_nfh: 668 FREE(nfh, M_TEMP); 669 670 return (error); 671 } 672 673 /* 674 * Common code for mount and mountroot 675 */ 676 int 677 mountnfs(argp, mp, nam, pth, hst, vpp, p) 678 struct nfs_args *argp; 679 struct mount *mp; 680 struct mbuf *nam; 681 const char *pth, *hst; 682 struct vnode **vpp; 683 struct proc *p; 684 { 685 struct nfsmount *nmp; 686 struct nfsnode *np; 687 int error; 688 struct vattr *attrs; 689 struct ucred *cr; 690 691 /* 692 * If the number of nfs iothreads to use has never 693 * been set, create a reasonable number of them. 694 */ 695 696 if (nfs_niothreads < 0) { 697 nfs_niothreads = NFS_DEFAULT_NIOTHREADS; 698 nfs_getset_niothreads(TRUE); 699 } 700 701 if (mp->mnt_flag & MNT_UPDATE) { 702 nmp = VFSTONFS(mp); 703 /* update paths, file handles, etc, here XXX */ 704 m_freem(nam); 705 return (0); 706 } else { 707 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 708 M_NFSMNT, M_WAITOK); 709 memset((caddr_t)nmp, 0, sizeof (struct nfsmount)); 710 mp->mnt_data = nmp; 711 TAILQ_INIT(&nmp->nm_uidlruhead); 712 TAILQ_INIT(&nmp->nm_bufq); 713 lockinit(&nmp->nm_writeverflock, PRIBIO, "nfswverf", 0, 0); 714 simple_lock_init(&nmp->nm_slock); 715 } 716 vfs_getnewfsid(mp); 717 nmp->nm_mountp = mp; 718 719 #ifndef NFS_V2_ONLY 720 if (argp->flags & NFSMNT_NQNFS) 721 mp->mnt_iflag |= IMNT_DTYPE; 722 #endif 723 724 #ifndef NFS_V2_ONLY 725 if ((argp->flags & NFSMNT_NFSV3) == 0) 726 #endif 727 /* 728 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 729 * will fill this in. 730 */ 731 nmp->nm_maxfilesize = 0xffffffffLL; 732 733 nmp->nm_timeo = NFS_TIMEO; 734 nmp->nm_retry = NFS_RETRANS; 735 nmp->nm_wsize = NFS_WSIZE; 736 nmp->nm_rsize = NFS_RSIZE; 737 nmp->nm_readdirsize = NFS_READDIRSIZE; 738 nmp->nm_numgrps = NFS_MAXGRPS; 739 nmp->nm_readahead = NFS_DEFRAHEAD; 740 nmp->nm_leaseterm = NQ_DEFLEASE; 741 nmp->nm_deadthresh = NQ_DEADTHRESH; 742 CIRCLEQ_INIT(&nmp->nm_timerhead); 743 nmp->nm_inprog = NULLVP; 744 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, mp, p); 745 if (error) 746 goto bad; 747 nmp->nm_nam = nam; 748 749 /* Set up the sockets and per-host congestion */ 750 nmp->nm_sotype = argp->sotype; 751 nmp->nm_soproto = argp->proto; 752 753 nfs_decode_args(nmp, argp, p); 754 755 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 756 mp->mnt_dev_bshift = DEV_BSHIFT; 757 758 /* 759 * For Connection based sockets (TCP,...) defer the connect until 760 * the first request, in case the server is not responding. 761 */ 762 if (nmp->nm_sotype == SOCK_DGRAM && 763 (error = nfs_connect(nmp, (struct nfsreq *)0, p))) 764 goto bad; 765 766 /* 767 * This is silly, but it has to be set so that vinifod() works. 768 * We do not want to do an nfs_statvfs() here since we can get 769 * stuck on a dead server and we are holding a lock on the mount 770 * point. 771 */ 772 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 773 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 774 if (error) 775 goto bad; 776 *vpp = NFSTOV(np); 777 MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK); 778 VOP_GETATTR(*vpp, attrs, p->p_ucred, p); 779 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 780 cr = crget(); 781 cr->cr_uid = attrs->va_uid; 782 cr->cr_gid = attrs->va_gid; 783 cr->cr_ngroups = 0; 784 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, p, cr); 785 crfree(cr); 786 } 787 FREE(attrs, M_TEMP); 788 789 /* 790 * A reference count is needed on the nfsnode representing the 791 * remote root. If this object is not persistent, then backward 792 * traversals of the mount point (i.e. "..") will not work if 793 * the nfsnode gets flushed out of the cache. Ufs does not have 794 * this problem, because one can identify root inodes by their 795 * number == ROOTINO (2). So, just unlock, but no rele. 796 */ 797 798 nmp->nm_vnode = *vpp; 799 VOP_UNLOCK(*vpp, 0); 800 801 return (0); 802 bad: 803 nfs_disconnect(nmp); 804 free((caddr_t)nmp, M_NFSMNT); 805 m_freem(nam); 806 return (error); 807 } 808 809 /* 810 * unmount system call 811 */ 812 int 813 nfs_unmount(mp, mntflags, p) 814 struct mount *mp; 815 int mntflags; 816 struct proc *p; 817 { 818 struct nfsmount *nmp; 819 struct vnode *vp; 820 int error, flags = 0; 821 822 if (mntflags & MNT_FORCE) 823 flags |= FORCECLOSE; 824 nmp = VFSTONFS(mp); 825 /* 826 * Goes something like this.. 827 * - Check for activity on the root vnode (other than ourselves). 828 * - Call vflush() to clear out vnodes for this file system, 829 * except for the root vnode. 830 * - Decrement reference on the vnode representing remote root. 831 * - Close the socket 832 * - Free up the data structures 833 */ 834 /* 835 * We need to decrement the ref. count on the nfsnode representing 836 * the remote root. See comment in mountnfs(). The VFS unmount() 837 * has done vput on this vnode, otherwise we would get deadlock! 838 */ 839 vp = nmp->nm_vnode; 840 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 841 if (error != 0) 842 return error; 843 844 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 845 vput(vp); 846 return (EBUSY); 847 } 848 849 /* 850 * Must handshake with nqnfs_clientd() if it is active. 851 */ 852 nmp->nm_iflag |= NFSMNT_DISMINPROG; 853 while (nmp->nm_inprog != NULLVP) 854 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 855 error = vflush(mp, vp, flags); 856 if (error) { 857 vput(vp); 858 nmp->nm_iflag &= ~NFSMNT_DISMINPROG; 859 return (error); 860 } 861 862 /* 863 * We are now committed to the unmount; mark the mount structure 864 * as doomed so that any sleepers kicked awake by nfs_disconnect 865 * will go away cleanly. 866 */ 867 nmp->nm_iflag |= NFSMNT_DISMNT; 868 869 /* 870 * There are two reference counts to get rid of here 871 * (see comment in mountnfs()). 872 */ 873 vrele(vp); 874 vput(vp); 875 vgone(vp); 876 nfs_disconnect(nmp); 877 m_freem(nmp->nm_nam); 878 879 /* 880 * For NQNFS, let the server daemon free the nfsmount structure. 881 */ 882 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 883 free((caddr_t)nmp, M_NFSMNT); 884 return (0); 885 } 886 887 /* 888 * Return root of a filesystem 889 */ 890 int 891 nfs_root(mp, vpp) 892 struct mount *mp; 893 struct vnode **vpp; 894 { 895 struct vnode *vp; 896 struct nfsmount *nmp; 897 int error; 898 899 nmp = VFSTONFS(mp); 900 vp = nmp->nm_vnode; 901 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 902 if (error != 0) 903 return error; 904 if (vp->v_type == VNON) 905 vp->v_type = VDIR; 906 vp->v_flag = VROOT; 907 *vpp = vp; 908 return (0); 909 } 910 911 extern int syncprt; 912 913 /* 914 * Flush out the buffer cache 915 */ 916 /* ARGSUSED */ 917 int 918 nfs_sync(mp, waitfor, cred, p) 919 struct mount *mp; 920 int waitfor; 921 struct ucred *cred; 922 struct proc *p; 923 { 924 struct vnode *vp; 925 int error, allerror = 0; 926 927 /* 928 * Force stale buffer cache information to be flushed. 929 */ 930 loop: 931 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 932 /* 933 * If the vnode that we are about to sync is no longer 934 * associated with this mount point, start over. 935 */ 936 if (vp->v_mount != mp) 937 goto loop; 938 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 939 (LIST_EMPTY(&vp->v_dirtyblkhd) && 940 vp->v_uobj.uo_npages == 0)) 941 continue; 942 if (vget(vp, LK_EXCLUSIVE)) 943 goto loop; 944 error = VOP_FSYNC(vp, cred, 945 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p); 946 if (error) 947 allerror = error; 948 vput(vp); 949 } 950 return (allerror); 951 } 952 953 /* 954 * NFS flat namespace lookup. 955 * Currently unsupported. 956 */ 957 /* ARGSUSED */ 958 int 959 nfs_vget(mp, ino, vpp) 960 struct mount *mp; 961 ino_t ino; 962 struct vnode **vpp; 963 { 964 965 return (EOPNOTSUPP); 966 } 967 968 /* 969 * Do that sysctl thang... 970 */ 971 static int 972 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 973 { 974 int error; 975 976 nfs_getset_niothreads(0); 977 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 978 if (error || newp == NULL) 979 return (error); 980 nfs_getset_niothreads(1); 981 982 return (0); 983 } 984 985 SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup") 986 { 987 988 sysctl_createv(clog, 0, NULL, NULL, 989 CTLFLAG_PERMANENT, 990 CTLTYPE_NODE, "vfs", NULL, 991 NULL, 0, NULL, 0, 992 CTL_VFS, CTL_EOL); 993 sysctl_createv(clog, 0, NULL, NULL, 994 CTLFLAG_PERMANENT, 995 CTLTYPE_NODE, "nfs", 996 SYSCTL_DESCR("NFS vfs options"), 997 NULL, 0, NULL, 0, 998 CTL_VFS, 2, CTL_EOL); 999 /* 1000 * XXX the "2" above could be dynamic, thereby eliminating one 1001 * more instance of the "number to vfs" mapping problem, but 1002 * "2" is the order as taken from sys/mount.h 1003 */ 1004 1005 sysctl_createv(clog, 0, NULL, NULL, 1006 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1007 CTLTYPE_STRUCT, "nfsstats", 1008 SYSCTL_DESCR("NFS operation statistics"), 1009 NULL, 0, &nfsstats, sizeof(nfsstats), 1010 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1011 sysctl_createv(clog, 0, NULL, NULL, 1012 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1013 CTLTYPE_INT, "iothreads", 1014 SYSCTL_DESCR("Number of NFS client processes desired"), 1015 sysctl_vfs_nfs_iothreads, 0, &nfs_niothreads, 0, 1016 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1017 } 1018 1019 /* 1020 * At this point, this should never happen 1021 */ 1022 /* ARGSUSED */ 1023 int 1024 nfs_fhtovp(mp, fhp, vpp) 1025 struct mount *mp; 1026 struct fid *fhp; 1027 struct vnode **vpp; 1028 { 1029 1030 return (EINVAL); 1031 } 1032 1033 /* ARGSUSED */ 1034 int 1035 nfs_checkexp(mp, nam, exflagsp, credanonp) 1036 struct mount *mp; 1037 struct mbuf *nam; 1038 int *exflagsp; 1039 struct ucred **credanonp; 1040 { 1041 1042 return (EINVAL); 1043 } 1044 1045 /* 1046 * Vnode pointer to File handle, should never happen either 1047 */ 1048 /* ARGSUSED */ 1049 int 1050 nfs_vptofh(vp, fhp) 1051 struct vnode *vp; 1052 struct fid *fhp; 1053 { 1054 1055 return (EINVAL); 1056 } 1057 1058 /* 1059 * Vfs start routine, a no-op. 1060 */ 1061 /* ARGSUSED */ 1062 int 1063 nfs_start(mp, flags, p) 1064 struct mount *mp; 1065 int flags; 1066 struct proc *p; 1067 { 1068 1069 return (0); 1070 } 1071 1072 /* 1073 * Do operations associated with quotas, not supported 1074 */ 1075 /* ARGSUSED */ 1076 int 1077 nfs_quotactl(mp, cmd, uid, arg, p) 1078 struct mount *mp; 1079 int cmd; 1080 uid_t uid; 1081 void *arg; 1082 struct proc *p; 1083 { 1084 1085 return (EOPNOTSUPP); 1086 } 1087