1 /* $OpenBSD: nfs_vfsops.c,v 1.116 2018/02/10 05:24:23 deraadt Exp $ */ 2 /* $NetBSD: nfs_vfsops.c,v 1.46.4.1 1996/05/25 22:40:35 fvdl Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993, 1995 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Rick Macklem at The University of Guelph. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 36 */ 37 38 #include <sys/param.h> 39 #include <sys/conf.h> 40 #include <sys/ioctl.h> 41 #include <sys/signal.h> 42 #include <sys/proc.h> 43 #include <sys/namei.h> 44 #include <sys/vnode.h> 45 #include <sys/lock.h> 46 #include <sys/kernel.h> 47 #include <sys/mount.h> 48 #include <sys/swap.h> 49 #include <sys/buf.h> 50 #include <sys/mbuf.h> 51 #include <sys/dirent.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/systm.h> 55 #include <sys/sysctl.h> 56 #include <sys/queue.h> 57 58 #include <netinet/in.h> 59 60 #include <nfs/rpcv2.h> 61 #include <nfs/nfsproto.h> 62 #include <nfs/nfsnode.h> 63 #include <nfs/nfs.h> 64 #include <nfs/nfsmount.h> 65 #include <nfs/xdr_subs.h> 66 #include <nfs/nfsm_subs.h> 67 #include <nfs/nfsdiskless.h> 68 #include <nfs/nfs_var.h> 69 70 extern struct nfsstats nfsstats; 71 extern int nfs_ticks; 72 extern u_int32_t nfs_procids[NFS_NPROCS]; 73 74 int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t, struct proc *); 75 int nfs_checkexp(struct mount *, struct mbuf *, int *, struct ucred **); 76 struct mount *nfs_mount_diskless(struct nfs_dlmount *, char *, int); 77 int mountnfs(struct nfs_args *, struct mount *, struct mbuf *, 78 const char *, char *); 79 int nfs_quotactl(struct mount *, int, uid_t, caddr_t, struct proc *); 80 int nfs_root(struct mount *, struct vnode **); 81 int nfs_start(struct mount *, int, struct proc *); 82 int nfs_statfs(struct mount *, struct statfs *, struct proc *); 83 int nfs_sync(struct mount *, int, int, struct ucred *, struct proc *); 84 int nfs_unmount(struct mount *, int, struct proc *); 85 int nfs_vget(struct mount *, ino_t, struct vnode **); 86 int nfs_vptofh(struct vnode *, struct fid *); 87 int nfs_mountroot(void); 88 void nfs_decode_args(struct nfsmount *, struct nfs_args *, 89 struct nfs_args *); 90 int nfs_fhtovp(struct mount *, struct fid *, struct vnode **); 91 92 /* 93 * nfs vfs operations. 94 */ 95 const struct vfsops nfs_vfsops = { 96 nfs_mount, 97 nfs_start, 98 nfs_unmount, 99 nfs_root, 100 nfs_quotactl, 101 nfs_statfs, 102 nfs_sync, 103 nfs_vget, 104 nfs_fhtovp, 105 nfs_vptofh, 106 nfs_vfs_init, 107 nfs_sysctl, 108 nfs_checkexp 109 }; 110 111 /* 112 * nfs statfs call 113 */ 114 int 115 nfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p) 116 { 117 struct vnode *vp; 118 struct nfs_statfs *sfp = NULL; 119 struct nfsm_info info; 120 u_int32_t *tl; 121 int32_t t1; 122 caddr_t cp2; 123 struct nfsmount *nmp = VFSTONFS(mp); 124 int error = 0, retattr; 125 struct ucred *cred; 126 struct nfsnode *np; 127 u_quad_t tquad; 128 129 info.nmi_v3 = (nmp->nm_flag & NFSMNT_NFSV3); 130 131 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 132 if (error) 133 return (error); 134 vp = NFSTOV(np); 135 cred = crget(); 136 cred->cr_ngroups = 0; 137 if (info.nmi_v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0) 138 (void)nfs_fsinfo(nmp, vp, cred, p); 139 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 140 info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3)); 141 nfsm_fhtom(&info, vp, info.nmi_v3); 142 143 info.nmi_procp = p; 144 info.nmi_cred = cred; 145 error = nfs_request(vp, NFSPROC_FSSTAT, &info); 146 if (info.nmi_v3) 147 nfsm_postop_attr(vp, retattr); 148 if (error) { 149 m_freem(info.nmi_mrep); 150 goto nfsmout; 151 } 152 153 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(info.nmi_v3)); 154 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 155 if (info.nmi_v3) { 156 sbp->f_bsize = NFS_FABLKSIZE; 157 tquad = fxdr_hyper(&sfp->sf_tbytes); 158 sbp->f_blocks = tquad / (u_quad_t)NFS_FABLKSIZE; 159 tquad = fxdr_hyper(&sfp->sf_fbytes); 160 sbp->f_bfree = tquad / (u_quad_t)NFS_FABLKSIZE; 161 tquad = fxdr_hyper(&sfp->sf_abytes); 162 sbp->f_bavail = (quad_t)tquad / (quad_t)NFS_FABLKSIZE; 163 164 tquad = fxdr_hyper(&sfp->sf_tfiles); 165 sbp->f_files = tquad; 166 tquad = fxdr_hyper(&sfp->sf_ffiles); 167 sbp->f_ffree = tquad; 168 sbp->f_favail = tquad; 169 } else { 170 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 171 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 172 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 173 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 174 sbp->f_files = 0; 175 sbp->f_ffree = 0; 176 sbp->f_favail = 0; 177 } 178 copy_statfs_info(sbp, mp); 179 m_freem(info.nmi_mrep); 180 nfsmout: 181 vrele(vp); 182 crfree(cred); 183 return (error); 184 } 185 186 /* 187 * nfs version 3 fsinfo rpc call 188 */ 189 int 190 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct ucred *cred, 191 struct proc *p) 192 { 193 struct nfsv3_fsinfo *fsp; 194 struct nfsm_info info; 195 int32_t t1; 196 u_int32_t *tl, pref, max; 197 caddr_t cp2; 198 int error = 0, retattr; 199 200 nfsstats.rpccnt[NFSPROC_FSINFO]++; 201 info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(1)); 202 nfsm_fhtom(&info, vp, 1); 203 204 info.nmi_procp = p; 205 info.nmi_cred = cred; 206 error = nfs_request(vp, NFSPROC_FSINFO, &info); 207 208 nfsm_postop_attr(vp, retattr); 209 if (error) { 210 m_freem(info.nmi_mrep); 211 goto nfsmout; 212 } 213 214 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 215 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 216 if (pref < nmp->nm_wsize) 217 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 218 ~(NFS_FABLKSIZE - 1); 219 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 220 if (max < nmp->nm_wsize) { 221 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 222 if (nmp->nm_wsize == 0) 223 nmp->nm_wsize = max; 224 } 225 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 226 if (pref < nmp->nm_rsize) 227 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 228 ~(NFS_FABLKSIZE - 1); 229 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 230 if (max < nmp->nm_rsize) { 231 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 232 if (nmp->nm_rsize == 0) 233 nmp->nm_rsize = max; 234 } 235 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 236 if (pref < nmp->nm_readdirsize) 237 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 238 ~(NFS_DIRBLKSIZ - 1); 239 if (max < nmp->nm_readdirsize) { 240 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 241 if (nmp->nm_readdirsize == 0) 242 nmp->nm_readdirsize = max; 243 } 244 nmp->nm_flag |= NFSMNT_GOTFSINFO; 245 246 m_freem(info.nmi_mrep); 247 nfsmout: 248 return (error); 249 } 250 251 struct nfs_diskless nfs_diskless; 252 253 /* 254 * Mount a remote root fs via. NFS. It goes like this: 255 * - Call nfs_boot_init() to fill in the nfs_diskless struct 256 * (using RARP, bootparam RPC, mountd RPC) 257 * - hand craft the swap nfs vnode hanging off a fake mount point 258 * if swdevt[0].sw_dev == NODEV 259 * - build the rootfs mount point and call mountnfs() to do the rest. 260 */ 261 int 262 nfs_mountroot(void) 263 { 264 struct vattr attr; 265 struct mount *mp; 266 struct vnode *vp; 267 struct proc *procp; 268 long n; 269 int error; 270 271 procp = curproc; /* XXX */ 272 273 /* 274 * Call nfs_boot_init() to fill in the nfs_diskless struct. 275 * Side effect: Finds and configures a network interface. 276 */ 277 nfs_boot_init(&nfs_diskless, procp); 278 279 /* 280 * Create the root mount point. 281 */ 282 if (nfs_boot_getfh(&nfs_diskless.nd_boot, "root", &nfs_diskless.nd_root, -1)) 283 panic("nfs_mountroot: root"); 284 mp = nfs_mount_diskless(&nfs_diskless.nd_root, "/", 0); 285 nfs_root(mp, &rootvp); 286 printf("root on %s\n", nfs_diskless.nd_root.ndm_host); 287 288 /* 289 * Link it into the mount list. 290 */ 291 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 292 vfs_unbusy(mp); 293 294 /* Get root attributes (for the time). */ 295 error = VOP_GETATTR(rootvp, &attr, procp->p_ucred, procp); 296 if (error) panic("nfs_mountroot: getattr for root"); 297 n = attr.va_atime.tv_sec; 298 #ifdef DEBUG 299 printf("root time: 0x%lx\n", n); 300 #endif 301 inittodr(n); 302 303 #ifdef notyet 304 /* Set up swap credentials. */ 305 proc0.p_ucred->cr_uid = ntohl(nfs_diskless.swap_ucred.cr_uid); 306 proc0.p_ucred->cr_gid = ntohl(nfs_diskless.swap_ucred.cr_gid); 307 if ((proc0.p_ucred->cr_ngroups = ntohs(nfs_diskless.swap_ucred.cr_ngroups)) > 308 NGROUPS_MAX) 309 proc0.p_ucred->cr_ngroups = NGROUPS_MAX; 310 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 311 proc0.p_ucred->cr_groups[i] = ntohl(nfs_diskless.swap_ucred.cr_groups[i]); 312 #endif 313 314 /* 315 * "Mount" the swap device. 316 * 317 * On a "dataless" configuration (swap on disk) we will have: 318 * (swdevt[0].sw_dev != NODEV) identifying the swap device. 319 */ 320 if (swdevt[0].sw_dev != NODEV) { 321 if (bdevvp(swapdev, &swapdev_vp)) 322 panic("nfs_mountroot: can't setup swap vp"); 323 printf("swap on device 0x%x\n", swdevt[0].sw_dev); 324 return (0); 325 } 326 327 /* 328 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV) 329 * Create a fake mount point just for the swap vnode so that the 330 * swap file can be on a different server from the rootfs. 331 * 332 * Wait 5 retries, finally no swap is cool. -mickey 333 */ 334 error = nfs_boot_getfh(&nfs_diskless.nd_boot, "swap", &nfs_diskless.nd_swap, 5); 335 if (!error) { 336 mp = nfs_mount_diskless(&nfs_diskless.nd_swap, "/swap", 0); 337 nfs_root(mp, &vp); 338 vfs_unbusy(mp); 339 340 /* 341 * Since the swap file is not the root dir of a file system, 342 * hack it to a regular file. 343 */ 344 vp->v_type = VREG; 345 vp->v_flag = 0; 346 347 /* 348 * Next line is a hack to make swapmount() work on NFS 349 * swap files. 350 */ 351 swdevt[0].sw_dev = NETDEV; 352 /* end hack */ 353 nfs_diskless.sw_vp = vp; 354 355 /* 356 * Find out how large the swap file is. 357 */ 358 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 359 if (error) 360 printf("nfs_mountroot: getattr for swap\n"); 361 n = (long) (attr.va_size >> DEV_BSHIFT); 362 363 printf("swap on %s\n", nfs_diskless.nd_swap.ndm_host); 364 #ifdef DEBUG 365 printf("swap size: 0x%lx (blocks)\n", n); 366 #endif 367 return (0); 368 } 369 370 printf("WARNING: no swap\n"); 371 swdevt[0].sw_dev = NODEV; 372 return (0); 373 } 374 375 /* 376 * Internal version of mount system call for diskless setup. 377 */ 378 struct mount * 379 nfs_mount_diskless(struct nfs_dlmount *ndmntp, char *mntname, int mntflag) 380 { 381 struct mount *mp; 382 struct mbuf *m; 383 int error; 384 385 if (vfs_rootmountalloc("nfs", mntname, &mp)) 386 panic("nfs_mount_diskless: vfs_rootmountalloc failed"); 387 mp->mnt_flag |= mntflag; 388 389 /* Get mbuf for server sockaddr. */ 390 m = m_get(M_WAIT, MT_SONAME); 391 bcopy(ndmntp->ndm_args.addr, mtod(m, caddr_t), 392 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 393 394 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 395 ndmntp->ndm_args.hostname); 396 if (error) 397 panic("nfs_mountroot: mount %s failed: %d", mntname, error); 398 399 return (mp); 400 } 401 402 void 403 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, 404 struct nfs_args *nargp) 405 { 406 int adjsock = 0; 407 int maxio; 408 409 #if 0 410 /* Re-bind if rsrvd port requested and wasn't on one */ 411 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 412 && (argp->flags & NFSMNT_RESVPORT); 413 #endif 414 /* Also re-bind if we're switching to/from a connected UDP socket */ 415 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 416 (argp->flags & NFSMNT_NOCONN)); 417 418 nmp->nm_flag = 419 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 420 421 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 422 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 423 if (nmp->nm_timeo < NFS_MINTIMEO) 424 nmp->nm_timeo = NFS_MINTIMEO; 425 else if (nmp->nm_timeo > NFS_MAXTIMEO) 426 nmp->nm_timeo = NFS_MAXTIMEO; 427 } 428 429 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) 430 nmp->nm_retry = MIN(argp->retrans, NFS_MAXREXMIT); 431 if (!(nmp->nm_flag & NFSMNT_SOFT)) 432 nmp->nm_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 433 434 if (argp->flags & NFSMNT_NFSV3) { 435 if (argp->sotype == SOCK_DGRAM) 436 maxio = NFS_MAXDGRAMDATA; 437 else 438 maxio = NFS_MAXDATA; 439 } else 440 maxio = NFS_V2MAXDATA; 441 442 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 443 int osize = nmp->nm_wsize; 444 nmp->nm_wsize = argp->wsize; 445 /* Round down to multiple of blocksize */ 446 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 447 if (nmp->nm_wsize <= 0) 448 nmp->nm_wsize = NFS_FABLKSIZE; 449 adjsock |= (nmp->nm_wsize != osize); 450 } 451 if (nmp->nm_wsize > maxio) 452 nmp->nm_wsize = maxio; 453 if (nmp->nm_wsize > MAXBSIZE) 454 nmp->nm_wsize = MAXBSIZE; 455 456 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 457 int osize = nmp->nm_rsize; 458 nmp->nm_rsize = argp->rsize; 459 /* Round down to multiple of blocksize */ 460 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 461 if (nmp->nm_rsize <= 0) 462 nmp->nm_rsize = NFS_FABLKSIZE; 463 adjsock |= (nmp->nm_rsize != osize); 464 } 465 if (nmp->nm_rsize > maxio) 466 nmp->nm_rsize = maxio; 467 if (nmp->nm_rsize > MAXBSIZE) 468 nmp->nm_rsize = MAXBSIZE; 469 470 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 471 nmp->nm_readdirsize = argp->readdirsize; 472 /* Round down to multiple of blocksize */ 473 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 474 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 475 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 476 } else if (argp->flags & NFSMNT_RSIZE) 477 nmp->nm_readdirsize = nmp->nm_rsize; 478 479 if (nmp->nm_readdirsize > maxio) 480 nmp->nm_readdirsize = maxio; 481 482 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 483 argp->maxgrouplist <= NFS_MAXGRPS) 484 nmp->nm_numgrps = argp->maxgrouplist; 485 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 486 argp->readahead <= NFS_MAXRAHEAD) 487 nmp->nm_readahead = argp->readahead; 488 if (argp->flags & NFSMNT_ACREGMIN && argp->acregmin >= 0) { 489 if (argp->acregmin > 0xffff) 490 nmp->nm_acregmin = 0xffff; 491 else 492 nmp->nm_acregmin = argp->acregmin; 493 } 494 if (argp->flags & NFSMNT_ACREGMAX && argp->acregmax >= 0) { 495 if (argp->acregmax > 0xffff) 496 nmp->nm_acregmax = 0xffff; 497 else 498 nmp->nm_acregmax = argp->acregmax; 499 } 500 if (nmp->nm_acregmin > nmp->nm_acregmax) 501 nmp->nm_acregmin = nmp->nm_acregmax; 502 503 if (argp->flags & NFSMNT_ACDIRMIN && argp->acdirmin >= 0) { 504 if (argp->acdirmin > 0xffff) 505 nmp->nm_acdirmin = 0xffff; 506 else 507 nmp->nm_acdirmin = argp->acdirmin; 508 } 509 if (argp->flags & NFSMNT_ACDIRMAX && argp->acdirmax >= 0) { 510 if (argp->acdirmax > 0xffff) 511 nmp->nm_acdirmax = 0xffff; 512 else 513 nmp->nm_acdirmax = argp->acdirmax; 514 } 515 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 516 nmp->nm_acdirmin = nmp->nm_acdirmax; 517 518 if (nmp->nm_so && adjsock) { 519 nfs_disconnect(nmp); 520 if (nmp->nm_sotype == SOCK_DGRAM) 521 while (nfs_connect(nmp, NULL)) { 522 printf("nfs_args: retrying connect\n"); 523 (void) tsleep(&lbolt, 524 PSOCK, "nfscon", 0); 525 } 526 } 527 528 /* Update nargp based on nmp */ 529 nargp->wsize = nmp->nm_wsize; 530 nargp->rsize = nmp->nm_rsize; 531 nargp->readdirsize = nmp->nm_readdirsize; 532 nargp->timeo = nmp->nm_timeo; 533 nargp->retrans = nmp->nm_retry; 534 nargp->maxgrouplist = nmp->nm_numgrps; 535 nargp->readahead = nmp->nm_readahead; 536 nargp->acregmin = nmp->nm_acregmin; 537 nargp->acregmax = nmp->nm_acregmax; 538 nargp->acdirmin = nmp->nm_acdirmin; 539 nargp->acdirmax = nmp->nm_acdirmax; 540 } 541 542 /* 543 * VFS Operations. 544 * 545 * mount system call 546 * It seems a bit dumb to copyinstr() the host here and then 547 * bcopy() it in mountnfs(), but I wanted to detect errors before 548 * doing the sockargs() call because sockargs() allocates an mbuf and 549 * an error after that means that I have to release the mbuf. 550 */ 551 /* ARGSUSED */ 552 int 553 nfs_mount(struct mount *mp, const char *path, void *data, 554 struct nameidata *ndp, struct proc *p) 555 { 556 int error; 557 struct nfs_args *args = data; 558 struct mbuf *nam; 559 char hst[MNAMELEN]; 560 size_t len; 561 u_char nfh[NFSX_V3FHMAX]; 562 563 if (args && 564 (args->flags & (NFSMNT_NFSV3|NFSMNT_RDIRPLUS)) == NFSMNT_RDIRPLUS) 565 return (EINVAL); 566 567 if (nfs_niothreads < 0) { 568 nfs_niothreads = 4; 569 nfs_getset_niothreads(1); 570 } 571 572 if (mp->mnt_flag & MNT_UPDATE) { 573 struct nfsmount *nmp = VFSTONFS(mp); 574 575 if (nmp == NULL) 576 return (EIO); 577 /* 578 * When doing an update, we can't change from or to 579 * v3. 580 */ 581 if (args) { 582 args->flags = (args->flags & ~(NFSMNT_NFSV3)) | 583 (nmp->nm_flag & (NFSMNT_NFSV3)); 584 nfs_decode_args(nmp, args, &mp->mnt_stat.mount_info.nfs_args); 585 } 586 return (0); 587 } 588 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 589 return (EINVAL); 590 error = copyin(args->fh, nfh, args->fhsize); 591 if (error) 592 return (error); 593 error = copyinstr(args->hostname, hst, MNAMELEN-1, &len); 594 if (error) 595 return (error); 596 memset(&hst[len], 0, MNAMELEN - len); 597 /* sockargs() call must be after above copyin() calls */ 598 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME); 599 if (error) 600 return (error); 601 args->fh = nfh; 602 error = mountnfs(args, mp, nam, path, hst); 603 return (error); 604 } 605 606 /* 607 * Common code for mount and mountroot 608 */ 609 int 610 mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, 611 const char *pth, char *hst) 612 { 613 struct nfsmount *nmp; 614 int error; 615 616 if (mp->mnt_flag & MNT_UPDATE) { 617 nmp = VFSTONFS(mp); 618 /* update paths, file handles, etc, here XXX */ 619 m_freem(nam); 620 return (0); 621 } else { 622 nmp = malloc(sizeof(*nmp), M_NFSMNT, 623 M_WAITOK|M_ZERO); 624 mp->mnt_data = nmp; 625 } 626 627 vfs_getnewfsid(mp); 628 nmp->nm_mountp = mp; 629 nmp->nm_timeo = NFS_TIMEO; 630 nmp->nm_retry = NFS_RETRANS; 631 nmp->nm_wsize = NFS_WSIZE; 632 nmp->nm_rsize = NFS_RSIZE; 633 nmp->nm_readdirsize = NFS_READDIRSIZE; 634 nmp->nm_numgrps = NFS_MAXGRPS; 635 nmp->nm_readahead = NFS_DEFRAHEAD; 636 nmp->nm_fhsize = argp->fhsize; 637 nmp->nm_acregmin = NFS_MINATTRTIMO; 638 nmp->nm_acregmax = NFS_MAXATTRTIMO; 639 nmp->nm_acdirmin = NFS_MINATTRTIMO; 640 nmp->nm_acdirmax = NFS_MAXATTRTIMO; 641 bcopy(argp->fh, nmp->nm_fh, argp->fhsize); 642 mp->mnt_stat.f_namemax = MAXNAMLEN; 643 memset(mp->mnt_stat.f_mntonname, 0, MNAMELEN); 644 strlcpy(mp->mnt_stat.f_mntonname, pth, MNAMELEN); 645 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 646 strlcpy(mp->mnt_stat.f_mntfromname, hst, MNAMELEN); 647 memset(mp->mnt_stat.f_mntfromspec, 0, MNAMELEN); 648 strlcpy(mp->mnt_stat.f_mntfromspec, hst, MNAMELEN); 649 bcopy(argp, &mp->mnt_stat.mount_info.nfs_args, sizeof(*argp)); 650 nmp->nm_nam = nam; 651 nfs_decode_args(nmp, argp, &mp->mnt_stat.mount_info.nfs_args); 652 653 nfs_ninit(nmp); 654 TAILQ_INIT(&nmp->nm_reqsq); 655 timeout_set_proc(&nmp->nm_rtimeout, nfs_timer, nmp); 656 657 /* Set up the sockets and per-host congestion */ 658 nmp->nm_sotype = argp->sotype; 659 nmp->nm_soproto = argp->proto; 660 661 /* 662 * For Connection based sockets (TCP,...) defer the connect until 663 * the first request, in case the server is not responding. 664 */ 665 if (nmp->nm_sotype == SOCK_DGRAM && 666 (error = nfs_connect(nmp, NULL))) 667 goto bad; 668 669 /* 670 * This is silly, but it has to be set so that vinifod() works. 671 * We do not want to do an nfs_statfs() here since we can get 672 * stuck on a dead server and we are holding a lock on the mount 673 * point. 674 */ 675 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 676 677 return (0); 678 bad: 679 nfs_disconnect(nmp); 680 free(nmp, M_NFSMNT, sizeof(*nmp)); 681 m_freem(nam); 682 return (error); 683 } 684 685 /* unmount system call */ 686 int 687 nfs_unmount(struct mount *mp, int mntflags, struct proc *p) 688 { 689 struct nfsmount *nmp; 690 int error, flags; 691 692 nmp = VFSTONFS(mp); 693 flags = 0; 694 695 if (mntflags & MNT_FORCE) 696 flags |= FORCECLOSE; 697 698 error = vflush(mp, NULL, flags); 699 if (error) 700 return (error); 701 702 nfs_disconnect(nmp); 703 m_freem(nmp->nm_nam); 704 timeout_del(&nmp->nm_rtimeout); 705 free(nmp, M_NFSMNT, sizeof(*nmp)); 706 mp->mnt_data = NULL; 707 return (0); 708 } 709 710 /* 711 * Return root of a filesystem 712 */ 713 int 714 nfs_root(struct mount *mp, struct vnode **vpp) 715 { 716 struct nfsmount *nmp; 717 struct nfsnode *np; 718 int error; 719 720 nmp = VFSTONFS(mp); 721 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 722 if (error) 723 return (error); 724 *vpp = NFSTOV(np); 725 return (0); 726 } 727 728 /* 729 * Flush out the buffer cache 730 */ 731 int 732 nfs_sync(struct mount *mp, int waitfor, int stall, struct ucred *cred, struct proc *p) 733 { 734 struct vnode *vp; 735 int error, allerror = 0; 736 737 /* 738 * Don't traverse the vnode list if we want to skip all of them. 739 */ 740 if (waitfor == MNT_LAZY) 741 return (allerror); 742 743 /* 744 * Force stale buffer cache information to be flushed. 745 */ 746 loop: 747 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 748 /* 749 * If the vnode that we are about to sync is no longer 750 * associated with this mount point, start over. 751 */ 752 if (vp->v_mount != mp) 753 goto loop; 754 if (VOP_ISLOCKED(vp) || LIST_FIRST(&vp->v_dirtyblkhd) == NULL) 755 continue; 756 if (vget(vp, LK_EXCLUSIVE, p)) 757 goto loop; 758 error = VOP_FSYNC(vp, cred, waitfor, p); 759 if (error) 760 allerror = error; 761 vput(vp); 762 } 763 764 return (allerror); 765 } 766 767 /* 768 * NFS flat namespace lookup. 769 * Currently unsupported. 770 */ 771 /* ARGSUSED */ 772 int 773 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 774 { 775 776 return (EOPNOTSUPP); 777 } 778 779 /* 780 * Do that sysctl thang... 781 */ 782 int 783 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 784 size_t newlen, struct proc *p) 785 { 786 int rv; 787 788 /* 789 * All names at this level are terminal. 790 */ 791 if(namelen > 1) 792 return ENOTDIR; /* overloaded */ 793 794 switch(name[0]) { 795 case NFS_NFSSTATS: 796 if(!oldp) { 797 *oldlenp = sizeof nfsstats; 798 return 0; 799 } 800 801 if(*oldlenp < sizeof nfsstats) { 802 *oldlenp = sizeof nfsstats; 803 return ENOMEM; 804 } 805 806 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 807 if(rv) return rv; 808 809 if(newp && newlen != sizeof nfsstats) 810 return EINVAL; 811 812 if(newp) { 813 return copyin(newp, &nfsstats, sizeof nfsstats); 814 } 815 return 0; 816 817 case NFS_NIOTHREADS: 818 nfs_getset_niothreads(0); 819 820 rv = sysctl_int(oldp, oldlenp, newp, newlen, &nfs_niothreads); 821 if (newp) 822 nfs_getset_niothreads(1); 823 824 return rv; 825 826 default: 827 return EOPNOTSUPP; 828 } 829 } 830 831 832 /* 833 * At this point, this should never happen 834 */ 835 /* ARGSUSED */ 836 int 837 nfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 838 { 839 return (EINVAL); 840 } 841 842 /* 843 * Vnode pointer to File handle, should never happen either 844 */ 845 /* ARGSUSED */ 846 int 847 nfs_vptofh(struct vnode *vp, struct fid *fhp) 848 { 849 return (EINVAL); 850 } 851 852 /* 853 * Vfs start routine, a no-op. 854 */ 855 /* ARGSUSED */ 856 int 857 nfs_start(struct mount *mp, int flags, struct proc *p) 858 { 859 return (0); 860 } 861 862 /* 863 * Do operations associated with quotas, not supported 864 */ 865 /* ARGSUSED */ 866 int 867 nfs_quotactl(struct mount *mp, int cmd, uid_t uid, caddr_t arg, struct proc *p) 868 { 869 return (EOPNOTSUPP); 870 } 871 872 /* 873 * check export permission, not supported 874 */ 875 /* ARGUSED */ 876 int 877 nfs_checkexp(struct mount *mp, struct mbuf *nam, int *exflagsp, 878 struct ucred **credanonp) 879 { 880 return (EOPNOTSUPP); 881 } 882 883