1 /* $OpenBSD: nfs_vfsops.c,v 1.117 2018/04/09 09:39:53 mpi 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, 75 struct proc *); 76 int nfs_checkexp(struct mount *, struct mbuf *, int *, struct ucred **); 77 struct mount *nfs_mount_diskless(struct nfs_dlmount *, char *, int, 78 struct vnode **, struct proc *p); 79 int mountnfs(struct nfs_args *, struct mount *, struct mbuf *, 80 const char *, char *, struct vnode **, struct proc *p); 81 int nfs_quotactl(struct mount *, int, uid_t, caddr_t, struct proc *); 82 int nfs_root(struct mount *, struct vnode **); 83 int nfs_start(struct mount *, int, struct proc *); 84 int nfs_statfs(struct mount *, struct statfs *, struct proc *); 85 int nfs_sync(struct mount *, int, int, struct ucred *, struct proc *); 86 int nfs_unmount(struct mount *, int, struct proc *); 87 int nfs_vget(struct mount *, ino_t, struct vnode **); 88 int nfs_vptofh(struct vnode *, struct fid *); 89 int nfs_mountroot(void); 90 void nfs_decode_args(struct nfsmount *, struct nfs_args *, 91 struct nfs_args *); 92 int nfs_fhtovp(struct mount *, struct fid *, struct vnode **); 93 94 /* 95 * nfs vfs operations. 96 */ 97 const struct vfsops nfs_vfsops = { 98 nfs_mount, 99 nfs_start, 100 nfs_unmount, 101 nfs_root, 102 nfs_quotactl, 103 nfs_statfs, 104 nfs_sync, 105 nfs_vget, 106 nfs_fhtovp, 107 nfs_vptofh, 108 nfs_vfs_init, 109 nfs_sysctl, 110 nfs_checkexp 111 }; 112 113 /* 114 * nfs statfs call 115 */ 116 int 117 nfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p) 118 { 119 struct vnode *vp; 120 struct nfs_statfs *sfp = NULL; 121 struct nfsm_info info; 122 u_int32_t *tl; 123 int32_t t1; 124 caddr_t cp2; 125 struct nfsmount *nmp = VFSTONFS(mp); 126 int error = 0, retattr; 127 struct ucred *cred; 128 u_quad_t tquad; 129 130 info.nmi_v3 = (nmp->nm_flag & NFSMNT_NFSV3); 131 132 error = nfs_root(mp, &vp); 133 if (error) 134 return (error); 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 vput(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, &vp, procp); 285 printf("root on %s\n", nfs_diskless.nd_root.ndm_host); 286 287 /* 288 * Link it into the mount list. 289 */ 290 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 291 rootvp = vp; 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, &vp, 337 procp); 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 struct vnode **vpp, struct proc *p) 381 { 382 struct mount *mp; 383 struct mbuf *m; 384 int error; 385 386 if (vfs_rootmountalloc("nfs", mntname, &mp)) 387 panic("nfs_mount_diskless: vfs_rootmountalloc failed"); 388 mp->mnt_flag |= mntflag; 389 390 /* Get mbuf for server sockaddr. */ 391 m = m_get(M_WAIT, MT_SONAME); 392 bcopy(ndmntp->ndm_args.addr, mtod(m, caddr_t), 393 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 394 395 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 396 ndmntp->ndm_args.hostname, vpp, p); 397 if (error) 398 panic("nfs_mountroot: mount %s failed: %d", mntname, error); 399 400 return (mp); 401 } 402 403 void 404 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, 405 struct nfs_args *nargp) 406 { 407 int adjsock = 0; 408 int maxio; 409 410 #if 0 411 /* Re-bind if rsrvd port requested and wasn't on one */ 412 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 413 && (argp->flags & NFSMNT_RESVPORT); 414 #endif 415 /* Also re-bind if we're switching to/from a connected UDP socket */ 416 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 417 (argp->flags & NFSMNT_NOCONN)); 418 419 nmp->nm_flag = 420 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 421 422 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 423 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 424 if (nmp->nm_timeo < NFS_MINTIMEO) 425 nmp->nm_timeo = NFS_MINTIMEO; 426 else if (nmp->nm_timeo > NFS_MAXTIMEO) 427 nmp->nm_timeo = NFS_MAXTIMEO; 428 } 429 430 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) 431 nmp->nm_retry = MIN(argp->retrans, NFS_MAXREXMIT); 432 if (!(nmp->nm_flag & NFSMNT_SOFT)) 433 nmp->nm_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 434 435 if (argp->flags & NFSMNT_NFSV3) { 436 if (argp->sotype == SOCK_DGRAM) 437 maxio = NFS_MAXDGRAMDATA; 438 else 439 maxio = NFS_MAXDATA; 440 } else 441 maxio = NFS_V2MAXDATA; 442 443 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 444 int osize = nmp->nm_wsize; 445 nmp->nm_wsize = argp->wsize; 446 /* Round down to multiple of blocksize */ 447 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 448 if (nmp->nm_wsize <= 0) 449 nmp->nm_wsize = NFS_FABLKSIZE; 450 adjsock |= (nmp->nm_wsize != osize); 451 } 452 if (nmp->nm_wsize > maxio) 453 nmp->nm_wsize = maxio; 454 if (nmp->nm_wsize > MAXBSIZE) 455 nmp->nm_wsize = MAXBSIZE; 456 457 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 458 int osize = nmp->nm_rsize; 459 nmp->nm_rsize = argp->rsize; 460 /* Round down to multiple of blocksize */ 461 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 462 if (nmp->nm_rsize <= 0) 463 nmp->nm_rsize = NFS_FABLKSIZE; 464 adjsock |= (nmp->nm_rsize != osize); 465 } 466 if (nmp->nm_rsize > maxio) 467 nmp->nm_rsize = maxio; 468 if (nmp->nm_rsize > MAXBSIZE) 469 nmp->nm_rsize = MAXBSIZE; 470 471 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 472 nmp->nm_readdirsize = argp->readdirsize; 473 /* Round down to multiple of blocksize */ 474 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 475 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 476 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 477 } else if (argp->flags & NFSMNT_RSIZE) 478 nmp->nm_readdirsize = nmp->nm_rsize; 479 480 if (nmp->nm_readdirsize > maxio) 481 nmp->nm_readdirsize = maxio; 482 483 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 484 argp->maxgrouplist <= NFS_MAXGRPS) 485 nmp->nm_numgrps = argp->maxgrouplist; 486 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 487 argp->readahead <= NFS_MAXRAHEAD) 488 nmp->nm_readahead = argp->readahead; 489 if (argp->flags & NFSMNT_ACREGMIN && argp->acregmin >= 0) { 490 if (argp->acregmin > 0xffff) 491 nmp->nm_acregmin = 0xffff; 492 else 493 nmp->nm_acregmin = argp->acregmin; 494 } 495 if (argp->flags & NFSMNT_ACREGMAX && argp->acregmax >= 0) { 496 if (argp->acregmax > 0xffff) 497 nmp->nm_acregmax = 0xffff; 498 else 499 nmp->nm_acregmax = argp->acregmax; 500 } 501 if (nmp->nm_acregmin > nmp->nm_acregmax) 502 nmp->nm_acregmin = nmp->nm_acregmax; 503 504 if (argp->flags & NFSMNT_ACDIRMIN && argp->acdirmin >= 0) { 505 if (argp->acdirmin > 0xffff) 506 nmp->nm_acdirmin = 0xffff; 507 else 508 nmp->nm_acdirmin = argp->acdirmin; 509 } 510 if (argp->flags & NFSMNT_ACDIRMAX && argp->acdirmax >= 0) { 511 if (argp->acdirmax > 0xffff) 512 nmp->nm_acdirmax = 0xffff; 513 else 514 nmp->nm_acdirmax = argp->acdirmax; 515 } 516 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 517 nmp->nm_acdirmin = nmp->nm_acdirmax; 518 519 if (nmp->nm_so && adjsock) { 520 nfs_disconnect(nmp); 521 if (nmp->nm_sotype == SOCK_DGRAM) 522 while (nfs_connect(nmp, NULL)) { 523 printf("nfs_args: retrying connect\n"); 524 (void) tsleep(&lbolt, 525 PSOCK, "nfscon", 0); 526 } 527 } 528 529 /* Update nargp based on nmp */ 530 nargp->wsize = nmp->nm_wsize; 531 nargp->rsize = nmp->nm_rsize; 532 nargp->readdirsize = nmp->nm_readdirsize; 533 nargp->timeo = nmp->nm_timeo; 534 nargp->retrans = nmp->nm_retry; 535 nargp->maxgrouplist = nmp->nm_numgrps; 536 nargp->readahead = nmp->nm_readahead; 537 nargp->acregmin = nmp->nm_acregmin; 538 nargp->acregmax = nmp->nm_acregmax; 539 nargp->acdirmin = nmp->nm_acdirmin; 540 nargp->acdirmax = nmp->nm_acdirmax; 541 } 542 543 /* 544 * VFS Operations. 545 * 546 * mount system call 547 * It seems a bit dumb to copyinstr() the host here and then 548 * bcopy() it in mountnfs(), but I wanted to detect errors before 549 * doing the sockargs() call because sockargs() allocates an mbuf and 550 * an error after that means that I have to release the mbuf. 551 */ 552 /* ARGSUSED */ 553 int 554 nfs_mount(struct mount *mp, const char *path, void *data, 555 struct nameidata *ndp, struct proc *p) 556 { 557 int error; 558 struct nfs_args *args = data; 559 struct mbuf *nam; 560 struct vnode *vp; 561 char hst[MNAMELEN]; 562 size_t len; 563 u_char nfh[NFSX_V3FHMAX]; 564 565 if (args && 566 (args->flags & (NFSMNT_NFSV3|NFSMNT_RDIRPLUS)) == NFSMNT_RDIRPLUS) 567 return (EINVAL); 568 569 if (nfs_niothreads < 0) { 570 nfs_niothreads = 4; 571 nfs_getset_niothreads(1); 572 } 573 574 if (mp->mnt_flag & MNT_UPDATE) { 575 struct nfsmount *nmp = VFSTONFS(mp); 576 577 if (nmp == NULL) 578 return (EIO); 579 /* 580 * When doing an update, we can't change from or to 581 * v3. 582 */ 583 if (args) { 584 args->flags = (args->flags & ~(NFSMNT_NFSV3)) | 585 (nmp->nm_flag & (NFSMNT_NFSV3)); 586 nfs_decode_args(nmp, args, &mp->mnt_stat.mount_info.nfs_args); 587 } 588 return (0); 589 } 590 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 591 return (EINVAL); 592 error = copyin(args->fh, nfh, args->fhsize); 593 if (error) 594 return (error); 595 error = copyinstr(args->hostname, hst, MNAMELEN-1, &len); 596 if (error) 597 return (error); 598 memset(&hst[len], 0, MNAMELEN - len); 599 /* sockargs() call must be after above copyin() calls */ 600 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME); 601 if (error) 602 return (error); 603 args->fh = nfh; 604 error = mountnfs(args, mp, nam, path, hst, &vp, p); 605 return (error); 606 } 607 608 /* 609 * Common code for mount and mountroot 610 */ 611 int 612 mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, 613 const char *pth, char *hst, struct vnode **vpp, struct proc *p) 614 { 615 struct nfsmount *nmp; 616 struct nfsnode *np; 617 struct vnode *vp; 618 struct vattr attr; 619 int error; 620 621 if (mp->mnt_flag & MNT_UPDATE) { 622 nmp = VFSTONFS(mp); 623 /* update paths, file handles, etc, here XXX */ 624 m_freem(nam); 625 return (0); 626 } else { 627 nmp = malloc(sizeof(*nmp), M_NFSMNT, 628 M_WAITOK|M_ZERO); 629 mp->mnt_data = nmp; 630 } 631 632 vfs_getnewfsid(mp); 633 nmp->nm_mountp = mp; 634 nmp->nm_timeo = NFS_TIMEO; 635 nmp->nm_retry = NFS_RETRANS; 636 nmp->nm_wsize = NFS_WSIZE; 637 nmp->nm_rsize = NFS_RSIZE; 638 nmp->nm_readdirsize = NFS_READDIRSIZE; 639 nmp->nm_numgrps = NFS_MAXGRPS; 640 nmp->nm_readahead = NFS_DEFRAHEAD; 641 nmp->nm_acregmin = NFS_MINATTRTIMO; 642 nmp->nm_acregmax = NFS_MAXATTRTIMO; 643 nmp->nm_acdirmin = NFS_MINATTRTIMO; 644 nmp->nm_acdirmax = NFS_MAXATTRTIMO; 645 mp->mnt_stat.f_namemax = MAXNAMLEN; 646 memset(mp->mnt_stat.f_mntonname, 0, MNAMELEN); 647 strlcpy(mp->mnt_stat.f_mntonname, pth, MNAMELEN); 648 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 649 strlcpy(mp->mnt_stat.f_mntfromname, hst, MNAMELEN); 650 memset(mp->mnt_stat.f_mntfromspec, 0, MNAMELEN); 651 strlcpy(mp->mnt_stat.f_mntfromspec, hst, MNAMELEN); 652 bcopy(argp, &mp->mnt_stat.mount_info.nfs_args, sizeof(*argp)); 653 nmp->nm_nam = nam; 654 nfs_decode_args(nmp, argp, &mp->mnt_stat.mount_info.nfs_args); 655 656 nfs_ninit(nmp); 657 TAILQ_INIT(&nmp->nm_reqsq); 658 timeout_set_proc(&nmp->nm_rtimeout, nfs_timer, nmp); 659 660 /* Set up the sockets and per-host congestion */ 661 nmp->nm_sotype = argp->sotype; 662 nmp->nm_soproto = argp->proto; 663 664 /* 665 * For Connection based sockets (TCP,...) defer the connect until 666 * the first request, in case the server is not responding. 667 */ 668 if (nmp->nm_sotype == SOCK_DGRAM && 669 (error = nfs_connect(nmp, NULL))) 670 goto bad; 671 672 /* 673 * This is silly, but it has to be set so that vinifod() works. 674 * We do not want to do an nfs_statfs() here since we can get 675 * stuck on a dead server and we are holding a lock on the mount 676 * point. 677 */ 678 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 679 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 680 if (error) 681 goto bad; 682 vp = NFSTOV(np); 683 error = VOP_GETATTR(vp, &attr, p->p_ucred, p); 684 if (error) { 685 vput(vp); 686 goto bad; 687 } 688 689 /* 690 * A reference count is needed on the nfsnode representing the 691 * remote root. If this object is not persistent, then backward 692 * traversals of the mount point (i.e. "..") will not work if 693 * the nfsnode gets flushed out of the cache. Ufs does not have 694 * this problem, because one can identify root inodes by their 695 * number == ROOTINO (2). So, just unlock, but no rele. 696 */ 697 nmp->nm_vnode = vp; 698 if (vp->v_type == VNON) 699 vp->v_type = VDIR; 700 vp->v_flag = VROOT; 701 VOP_UNLOCK(vp, curproc); 702 *vpp = vp; 703 704 return (0); 705 bad: 706 nfs_disconnect(nmp); 707 free(nmp, M_NFSMNT, sizeof(*nmp)); 708 m_freem(nam); 709 return (error); 710 } 711 712 /* unmount system call */ 713 int 714 nfs_unmount(struct mount *mp, int mntflags, struct proc *p) 715 { 716 struct nfsmount *nmp; 717 struct vnode *vp; 718 int error, flags = 0; 719 720 nmp = VFSTONFS(mp); 721 error = nfs_root(mp, &vp); 722 if (error) 723 return (error); 724 725 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 726 vput(vp); 727 return (EBUSY); 728 } 729 730 if (mntflags & MNT_FORCE) 731 flags |= FORCECLOSE; 732 733 error = vflush(mp, vp, flags); 734 if (error) { 735 vput(vp); 736 return (error); 737 } 738 739 /* 740 * There are two references count to get rid of here: one 741 * from mountnfs() and one from nfs_root() above. 742 */ 743 vrele(vp); 744 vput(vp); 745 vgone(vp); 746 nfs_disconnect(nmp); 747 m_freem(nmp->nm_nam); 748 timeout_del(&nmp->nm_rtimeout); 749 free(nmp, M_NFSMNT, sizeof(*nmp)); 750 mp->mnt_data = NULL; 751 return (0); 752 } 753 754 /* 755 * Return root of a filesystem 756 */ 757 int 758 nfs_root(struct mount *mp, struct vnode **vpp) 759 { 760 struct vnode *vp; 761 struct nfsmount *nmp; 762 int error; 763 764 nmp = VFSTONFS(mp); 765 vp = nmp->nm_vnode; 766 vref(vp); 767 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curproc); 768 if (error) { 769 vrele(vp); 770 return (error); 771 } 772 *vpp = vp; 773 return (0); 774 } 775 776 /* 777 * Flush out the buffer cache 778 */ 779 int 780 nfs_sync(struct mount *mp, int waitfor, int stall, struct ucred *cred, struct proc *p) 781 { 782 struct vnode *vp; 783 int error, allerror = 0; 784 785 /* 786 * Don't traverse the vnode list if we want to skip all of them. 787 */ 788 if (waitfor == MNT_LAZY) 789 return (allerror); 790 791 /* 792 * Force stale buffer cache information to be flushed. 793 */ 794 loop: 795 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 796 /* 797 * If the vnode that we are about to sync is no longer 798 * associated with this mount point, start over. 799 */ 800 if (vp->v_mount != mp) 801 goto loop; 802 if (VOP_ISLOCKED(vp) || LIST_FIRST(&vp->v_dirtyblkhd) == NULL) 803 continue; 804 if (vget(vp, LK_EXCLUSIVE, p)) 805 goto loop; 806 error = VOP_FSYNC(vp, cred, waitfor, p); 807 if (error) 808 allerror = error; 809 vput(vp); 810 } 811 812 return (allerror); 813 } 814 815 /* 816 * NFS flat namespace lookup. 817 * Currently unsupported. 818 */ 819 /* ARGSUSED */ 820 int 821 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 822 { 823 824 return (EOPNOTSUPP); 825 } 826 827 /* 828 * Do that sysctl thang... 829 */ 830 int 831 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 832 size_t newlen, struct proc *p) 833 { 834 int rv; 835 836 /* 837 * All names at this level are terminal. 838 */ 839 if(namelen > 1) 840 return ENOTDIR; /* overloaded */ 841 842 switch(name[0]) { 843 case NFS_NFSSTATS: 844 if(!oldp) { 845 *oldlenp = sizeof nfsstats; 846 return 0; 847 } 848 849 if(*oldlenp < sizeof nfsstats) { 850 *oldlenp = sizeof nfsstats; 851 return ENOMEM; 852 } 853 854 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 855 if(rv) return rv; 856 857 if(newp && newlen != sizeof nfsstats) 858 return EINVAL; 859 860 if(newp) { 861 return copyin(newp, &nfsstats, sizeof nfsstats); 862 } 863 return 0; 864 865 case NFS_NIOTHREADS: 866 nfs_getset_niothreads(0); 867 868 rv = sysctl_int(oldp, oldlenp, newp, newlen, &nfs_niothreads); 869 if (newp) 870 nfs_getset_niothreads(1); 871 872 return rv; 873 874 default: 875 return EOPNOTSUPP; 876 } 877 } 878 879 880 /* 881 * At this point, this should never happen 882 */ 883 /* ARGSUSED */ 884 int 885 nfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 886 { 887 return (EINVAL); 888 } 889 890 /* 891 * Vnode pointer to File handle, should never happen either 892 */ 893 /* ARGSUSED */ 894 int 895 nfs_vptofh(struct vnode *vp, struct fid *fhp) 896 { 897 return (EINVAL); 898 } 899 900 /* 901 * Vfs start routine, a no-op. 902 */ 903 /* ARGSUSED */ 904 int 905 nfs_start(struct mount *mp, int flags, struct proc *p) 906 { 907 return (0); 908 } 909 910 /* 911 * Do operations associated with quotas, not supported 912 */ 913 /* ARGSUSED */ 914 int 915 nfs_quotactl(struct mount *mp, int cmd, uid_t uid, caddr_t arg, struct proc *p) 916 { 917 return (EOPNOTSUPP); 918 } 919 920 /* 921 * check export permission, not supported 922 */ 923 /* ARGUSED */ 924 int 925 nfs_checkexp(struct mount *mp, struct mbuf *nam, int *exflagsp, 926 struct ucred **credanonp) 927 { 928 return (EOPNOTSUPP); 929 } 930 931