1 /* $OpenBSD: nfs_vfsops.c,v 1.131 2024/05/12 09:09:39 jsg 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/proc.h> 41 #include <sys/vnode.h> 42 #include <sys/lock.h> 43 #include <sys/kernel.h> 44 #include <sys/mount.h> 45 #include <sys/swap.h> 46 #include <sys/mbuf.h> 47 #include <sys/dirent.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/systm.h> 51 #include <sys/sysctl.h> 52 #include <sys/queue.h> 53 54 #include <netinet/in.h> 55 56 #include <nfs/nfsproto.h> 57 #include <nfs/nfsnode.h> 58 #include <nfs/nfs.h> 59 #include <nfs/nfsmount.h> 60 #include <nfs/xdr_subs.h> 61 #include <nfs/nfsdiskless.h> 62 #include <nfs/nfs_var.h> 63 #include <nfs/nfsm_subs.h> 64 65 extern struct nfsstats nfsstats; 66 extern int nfs_ticks; 67 68 int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t, 69 struct proc *); 70 int nfs_checkexp(struct mount *, struct mbuf *, int *, struct ucred **); 71 struct mount *nfs_mount_diskless(struct nfs_dlmount *, char *, int, 72 struct vnode **, struct proc *p); 73 int mountnfs(struct nfs_args *, struct mount *, struct mbuf *, 74 const char *, char *, struct vnode **, struct proc *p); 75 int nfs_quotactl(struct mount *, int, uid_t, caddr_t, struct proc *); 76 int nfs_root(struct mount *, struct vnode **); 77 int nfs_start(struct mount *, int, struct proc *); 78 int nfs_statfs(struct mount *, struct statfs *, struct proc *); 79 int nfs_sync(struct mount *, int, int, struct ucred *, struct proc *); 80 int nfs_unmount(struct mount *, int, struct proc *); 81 void nfs_reaper(void *); 82 int nfs_vget(struct mount *, ino_t, struct vnode **); 83 int nfs_vptofh(struct vnode *, struct fid *); 84 int nfs_mountroot(void); 85 void nfs_decode_args(struct nfsmount *, struct nfs_args *, 86 struct nfs_args *); 87 int nfs_fhtovp(struct mount *, struct fid *, struct vnode **); 88 89 /* 90 * nfs vfs operations. 91 */ 92 const struct vfsops nfs_vfsops = { 93 .vfs_mount = nfs_mount, 94 .vfs_start = nfs_start, 95 .vfs_unmount = nfs_unmount, 96 .vfs_root = nfs_root, 97 .vfs_quotactl = nfs_quotactl, 98 .vfs_statfs = nfs_statfs, 99 .vfs_sync = nfs_sync, 100 .vfs_vget = nfs_vget, 101 .vfs_fhtovp = nfs_fhtovp, 102 .vfs_vptofh = nfs_vptofh, 103 .vfs_init = nfs_vfs_init, 104 .vfs_sysctl = nfs_sysctl, 105 .vfs_checkexp = nfs_checkexp, 106 }; 107 108 /* 109 * nfs statfs call 110 */ 111 int 112 nfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p) 113 { 114 struct vnode *vp; 115 struct nfs_statfs *sfp = NULL; 116 struct nfsm_info info; 117 struct nfsmount *nmp = VFSTONFS(mp); 118 int error = 0, retattr; 119 struct ucred *cred; 120 u_quad_t tquad; 121 122 info.nmi_v3 = (nmp->nm_flag & NFSMNT_NFSV3); 123 info.nmi_errorp = &error; 124 125 error = nfs_root(mp, &vp); 126 if (error) 127 return (error); 128 cred = crget(); 129 cred->cr_ngroups = 0; 130 if (info.nmi_v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0) 131 (void)nfs_fsinfo(nmp, vp, cred, p); 132 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 133 info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3)); 134 nfsm_fhtom(&info, vp, info.nmi_v3); 135 136 info.nmi_procp = p; 137 info.nmi_cred = cred; 138 error = nfs_request(vp, NFSPROC_FSSTAT, &info); 139 if (info.nmi_v3) { 140 if (nfsm_postop_attr(&info, &vp, &retattr) != 0) 141 goto nfsmout; 142 } 143 if (error) { 144 m_freem(info.nmi_mrep); 145 goto nfsmout; 146 } 147 148 sfp = (struct nfs_statfs *) 149 nfsm_dissect(&info, NFSX_STATFS(info.nmi_v3)); 150 if (sfp == NULL) 151 goto nfsmout; 152 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 153 if (info.nmi_v3) { 154 sbp->f_bsize = NFS_FABLKSIZE; 155 tquad = fxdr_hyper(&sfp->sf_tbytes); 156 sbp->f_blocks = tquad / (u_quad_t)NFS_FABLKSIZE; 157 tquad = fxdr_hyper(&sfp->sf_fbytes); 158 sbp->f_bfree = tquad / (u_quad_t)NFS_FABLKSIZE; 159 tquad = fxdr_hyper(&sfp->sf_abytes); 160 sbp->f_bavail = (quad_t)tquad / (quad_t)NFS_FABLKSIZE; 161 162 tquad = fxdr_hyper(&sfp->sf_tfiles); 163 sbp->f_files = tquad; 164 tquad = fxdr_hyper(&sfp->sf_ffiles); 165 sbp->f_ffree = tquad; 166 sbp->f_favail = tquad; 167 } else { 168 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 169 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 170 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 171 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 172 sbp->f_files = 0; 173 sbp->f_ffree = 0; 174 sbp->f_favail = 0; 175 } 176 copy_statfs_info(sbp, mp); 177 m_freem(info.nmi_mrep); 178 nfsmout: 179 vput(vp); 180 crfree(cred); 181 return (error); 182 } 183 184 /* 185 * nfs version 3 fsinfo rpc call 186 */ 187 int 188 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct ucred *cred, 189 struct proc *p) 190 { 191 struct nfsv3_fsinfo *fsp; 192 struct nfsm_info info; 193 u_int32_t pref, max; 194 int error = 0, retattr; 195 196 nfsstats.rpccnt[NFSPROC_FSINFO]++; 197 info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(1)); 198 nfsm_fhtom(&info, vp, 1); 199 200 info.nmi_procp = p; 201 info.nmi_cred = cred; 202 info.nmi_errorp = &error; 203 error = nfs_request(vp, NFSPROC_FSINFO, &info); 204 205 if (nfsm_postop_attr(&info, &vp, &retattr) != 0) 206 goto nfsmout; 207 if (error) { 208 m_freem(info.nmi_mrep); 209 goto nfsmout; 210 } 211 212 fsp = (struct nfsv3_fsinfo *)nfsm_dissect(&info, NFSX_V3FSINFO); 213 if (fsp == NULL) 214 goto nfsmout; 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 tsleep_nsec(&nowake, PSOCK, "nfscon", 525 SEC_TO_NSEC(1)); 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 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 struct vnode *vp; 560 char hst[MNAMELEN]; 561 size_t len; 562 u_char nfh[NFSX_V3FHMAX]; 563 564 if (args && 565 (args->flags & (NFSMNT_NFSV3|NFSMNT_RDIRPLUS)) == NFSMNT_RDIRPLUS) 566 return (EINVAL); 567 568 if (nfs_niothreads < 0) { 569 nfs_niothreads = 4; 570 nfs_getset_niothreads(1); 571 } 572 573 if (mp->mnt_flag & MNT_UPDATE) { 574 struct nfsmount *nmp = VFSTONFS(mp); 575 576 if (nmp == NULL) 577 return (EIO); 578 /* 579 * When doing an update, we can't change from or to 580 * v3. 581 */ 582 if (args) { 583 args->flags = (args->flags & ~(NFSMNT_NFSV3)) | 584 (nmp->nm_flag & (NFSMNT_NFSV3)); 585 nfs_decode_args(nmp, args, &mp->mnt_stat.mount_info.nfs_args); 586 } 587 return (0); 588 } 589 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 590 return (EINVAL); 591 error = copyin(args->fh, nfh, args->fhsize); 592 if (error) 593 return (error); 594 error = copyinstr(args->hostname, hst, MNAMELEN-1, &len); 595 if (error) 596 return (error); 597 memset(&hst[len], 0, MNAMELEN - len); 598 /* sockargs() call must be after above copyin() calls */ 599 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME); 600 if (error) 601 return (error); 602 args->fh = nfh; 603 error = mountnfs(args, mp, nam, path, hst, &vp, p); 604 return (error); 605 } 606 607 /* 608 * Common code for mount and mountroot 609 */ 610 int 611 mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, 612 const char *pth, char *hst, struct vnode **vpp, struct proc *p) 613 { 614 struct nfsmount *nmp; 615 struct nfsnode *np; 616 struct vnode *vp; 617 struct vattr attr; 618 int error; 619 620 if (mp->mnt_flag & MNT_UPDATE) { 621 nmp = VFSTONFS(mp); 622 /* update paths, file handles, etc, here XXX */ 623 m_freem(nam); 624 return (0); 625 } else { 626 nmp = malloc(sizeof(*nmp), M_NFSMNT, 627 M_WAITOK|M_ZERO); 628 mp->mnt_data = nmp; 629 } 630 631 vfs_getnewfsid(mp); 632 nmp->nm_mountp = mp; 633 nmp->nm_timeo = NFS_TIMEO; 634 nmp->nm_retry = NFS_RETRANS; 635 nmp->nm_wsize = NFS_WSIZE; 636 nmp->nm_rsize = NFS_RSIZE; 637 nmp->nm_readdirsize = NFS_READDIRSIZE; 638 nmp->nm_numgrps = NFS_MAXGRPS; 639 nmp->nm_readahead = NFS_DEFRAHEAD; 640 nmp->nm_acregmin = NFS_MINATTRTIMO; 641 nmp->nm_acregmax = NFS_MAXATTRTIMO; 642 nmp->nm_acdirmin = NFS_MINATTRTIMO; 643 nmp->nm_acdirmax = NFS_MAXATTRTIMO; 644 mp->mnt_stat.f_namemax = MAXNAMLEN; 645 memset(mp->mnt_stat.f_mntonname, 0, MNAMELEN); 646 strlcpy(mp->mnt_stat.f_mntonname, pth, MNAMELEN); 647 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 648 strlcpy(mp->mnt_stat.f_mntfromname, hst, MNAMELEN); 649 memset(mp->mnt_stat.f_mntfromspec, 0, MNAMELEN); 650 strlcpy(mp->mnt_stat.f_mntfromspec, hst, MNAMELEN); 651 bcopy(argp, &mp->mnt_stat.mount_info.nfs_args, sizeof(*argp)); 652 nmp->nm_nam = nam; 653 nfs_decode_args(nmp, argp, &mp->mnt_stat.mount_info.nfs_args); 654 655 nfs_ninit(nmp); 656 TAILQ_INIT(&nmp->nm_reqsq); 657 timeout_set_proc(&nmp->nm_rtimeout, nfs_timer, nmp); 658 659 /* Set up the sockets and per-host congestion */ 660 nmp->nm_sotype = argp->sotype; 661 nmp->nm_soproto = argp->proto; 662 663 /* 664 * For Connection based sockets (TCP,...) defer the connect until 665 * the first request, in case the server is not responding. 666 */ 667 if (nmp->nm_sotype == SOCK_DGRAM && 668 (error = nfs_connect(nmp, NULL))) 669 goto bad; 670 671 /* 672 * This is silly, but it has to be set so that vinifod() works. 673 * We do not want to do an nfs_statfs() here since we can get 674 * stuck on a dead server and we are holding a lock on the mount 675 * point. 676 */ 677 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 678 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 679 if (error) 680 goto bad; 681 vp = NFSTOV(np); 682 error = VOP_GETATTR(vp, &attr, p->p_ucred, p); 683 if (error) { 684 vput(vp); 685 goto bad; 686 } 687 688 /* 689 * A reference count is needed on the nfsnode representing the 690 * remote root. If this object is not persistent, then backward 691 * traversals of the mount point (i.e. "..") will not work if 692 * the nfsnode gets flushed out of the cache. Ufs does not have 693 * this problem, because one can identify root inodes by their 694 * number == ROOTINO (2). So, just unlock, but no rele. 695 */ 696 nmp->nm_vnode = vp; 697 if (vp->v_type == VNON) 698 vp->v_type = VDIR; 699 vp->v_flag = VROOT; 700 VOP_UNLOCK(vp); 701 *vpp = vp; 702 703 return (0); 704 bad: 705 nfs_disconnect(nmp); 706 free(nmp, M_NFSMNT, sizeof(*nmp)); 707 m_freem(nam); 708 return (error); 709 } 710 711 /* unmount system call */ 712 int 713 nfs_unmount(struct mount *mp, int mntflags, struct proc *p) 714 { 715 struct nfsmount *nmp; 716 struct vnode *vp; 717 int error, flags = 0; 718 719 nmp = VFSTONFS(mp); 720 error = nfs_root(mp, &vp); 721 if (error) 722 return (error); 723 724 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 725 vput(vp); 726 return (EBUSY); 727 } 728 729 if (mntflags & MNT_FORCE) 730 flags |= FORCECLOSE; 731 732 error = vflush(mp, vp, flags); 733 if (error) { 734 vput(vp); 735 return (error); 736 } 737 738 /* 739 * There are two references count to get rid of here: one 740 * from mountnfs() and one from nfs_root() above. 741 */ 742 vrele(vp); 743 vput(vp); 744 vgone(vp); 745 nfs_disconnect(nmp); 746 m_freem(nmp->nm_nam); 747 timeout_del(&nmp->nm_rtimeout); 748 timeout_set_proc(&nmp->nm_rtimeout, nfs_reaper, nmp); 749 timeout_add(&nmp->nm_rtimeout, 0); 750 mp->mnt_data = NULL; 751 return (0); 752 } 753 754 /* 755 * Delay nfs mount point free until pending or sleeping timeouts have finished. 756 */ 757 void 758 nfs_reaper(void *arg) 759 { 760 struct nfsmount *nmp = arg; 761 762 free(nmp, M_NFSMNT, sizeof(*nmp)); 763 } 764 765 /* 766 * Return root of a filesystem 767 */ 768 int 769 nfs_root(struct mount *mp, struct vnode **vpp) 770 { 771 struct vnode *vp; 772 struct nfsmount *nmp; 773 int error; 774 775 nmp = VFSTONFS(mp); 776 vp = nmp->nm_vnode; 777 vref(vp); 778 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 779 if (error) { 780 vrele(vp); 781 return (error); 782 } 783 *vpp = vp; 784 return (0); 785 } 786 787 /* 788 * Flush out the buffer cache 789 */ 790 int 791 nfs_sync(struct mount *mp, int waitfor, int stall, struct ucred *cred, struct proc *p) 792 { 793 struct vnode *vp; 794 int allerror = 0; 795 int empty, error, s; 796 797 /* 798 * Don't traverse the vnode list if we want to skip all of them. 799 */ 800 if (waitfor == MNT_LAZY) 801 return (allerror); 802 803 /* 804 * Force stale buffer cache information to be flushed. 805 */ 806 loop: 807 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 808 /* 809 * If the vnode that we are about to sync is no longer 810 * associated with this mount point, start over. 811 */ 812 if (vp->v_mount != mp) 813 goto loop; 814 if (VOP_ISLOCKED(vp)) 815 continue; 816 s = splbio(); 817 empty = LIST_EMPTY(&vp->v_dirtyblkhd); 818 splx(s); 819 if (empty) 820 continue; 821 if (vget(vp, LK_EXCLUSIVE)) 822 goto loop; 823 error = VOP_FSYNC(vp, cred, waitfor, p); 824 if (error) 825 allerror = error; 826 vput(vp); 827 } 828 829 return (allerror); 830 } 831 832 /* 833 * NFS flat namespace lookup. 834 * Currently unsupported. 835 */ 836 int 837 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 838 { 839 840 return (EOPNOTSUPP); 841 } 842 843 /* 844 * Do that sysctl thang... 845 */ 846 int 847 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 848 size_t newlen, struct proc *p) 849 { 850 int rv; 851 852 /* 853 * All names at this level are terminal. 854 */ 855 if(namelen > 1) 856 return ENOTDIR; /* overloaded */ 857 858 switch(name[0]) { 859 case NFS_NFSSTATS: 860 if(!oldp) { 861 *oldlenp = sizeof nfsstats; 862 return 0; 863 } 864 865 if(*oldlenp < sizeof nfsstats) { 866 *oldlenp = sizeof nfsstats; 867 return ENOMEM; 868 } 869 870 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 871 if(rv) return rv; 872 873 if(newp && newlen != sizeof nfsstats) 874 return EINVAL; 875 876 if(newp) { 877 return copyin(newp, &nfsstats, sizeof nfsstats); 878 } 879 return 0; 880 881 case NFS_NIOTHREADS: 882 nfs_getset_niothreads(0); 883 884 rv = sysctl_int(oldp, oldlenp, newp, newlen, &nfs_niothreads); 885 if (newp) 886 nfs_getset_niothreads(1); 887 888 return rv; 889 890 default: 891 return EOPNOTSUPP; 892 } 893 } 894 895 896 /* 897 * At this point, this should never happen 898 */ 899 int 900 nfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 901 { 902 return (EINVAL); 903 } 904 905 /* 906 * Vnode pointer to File handle, should never happen either 907 */ 908 int 909 nfs_vptofh(struct vnode *vp, struct fid *fhp) 910 { 911 return (EINVAL); 912 } 913 914 /* 915 * Vfs start routine, a no-op. 916 */ 917 int 918 nfs_start(struct mount *mp, int flags, struct proc *p) 919 { 920 return (0); 921 } 922 923 /* 924 * Do operations associated with quotas, not supported 925 */ 926 int 927 nfs_quotactl(struct mount *mp, int cmd, uid_t uid, caddr_t arg, struct proc *p) 928 { 929 return (EOPNOTSUPP); 930 } 931 932 /* 933 * check export permission, not supported 934 */ 935 /* ARGUSED */ 936 int 937 nfs_checkexp(struct mount *mp, struct mbuf *nam, int *exflagsp, 938 struct ucred **credanonp) 939 { 940 return (EOPNOTSUPP); 941 } 942 943