nfs_vfsops.c revision 1.8
1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)nfs_vfsops.c 7.31 (Berkeley) 5/6/91 37 * $Id: nfs_vfsops.c,v 1.8 1993/12/07 23:37:43 pk Exp $ 38 */ 39 40 #include "param.h" 41 #include "conf.h" 42 #include "ioctl.h" 43 #include "signal.h" 44 #include "proc.h" 45 #include "namei.h" 46 #include "vnode.h" 47 #include "mount.h" 48 #include "buf.h" 49 #include "mbuf.h" 50 #include "socket.h" 51 #include "systm.h" 52 53 #include "../net/if.h" 54 #include "../net/route.h" 55 #include "../netinet/in.h" 56 57 #include "nfsv2.h" 58 #include "nfsnode.h" 59 #include "nfsmount.h" 60 #include "nfs.h" 61 #include "xdr_subs.h" 62 #include "nfsm_subs.h" 63 #include "nfsdiskless.h" 64 65 /* 66 * nfs vfs operations. 67 */ 68 struct vfsops nfs_vfsops = { 69 nfs_mount, 70 nfs_start, 71 nfs_unmount, 72 nfs_root, 73 nfs_quotactl, 74 nfs_statfs, 75 nfs_sync, 76 nfs_fhtovp, 77 nfs_vptofh, 78 nfs_init, 79 }; 80 81 static u_char nfs_mntid; 82 extern u_long nfs_procids[NFS_NPROCS]; 83 extern u_long nfs_prog, nfs_vers; 84 struct nfs_diskless nfs_diskless; 85 void nfs_disconnect(); 86 87 #define TRUE 1 88 #define FALSE 0 89 90 /* 91 * nfs statfs call 92 */ 93 nfs_statfs(mp, sbp, p) 94 struct mount *mp; 95 register struct statfs *sbp; 96 struct proc *p; 97 { 98 register struct vnode *vp; 99 register struct nfsv2_statfs *sfp; 100 register caddr_t cp; 101 register long t1; 102 caddr_t bpos, dpos, cp2; 103 u_long xid; 104 int error = 0; 105 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 106 struct nfsmount *nmp; 107 struct ucred *cred; 108 struct nfsnode *np; 109 110 nmp = VFSTONFS(mp); 111 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 112 return (error); 113 vp = NFSTOV(np); 114 nfsstats.rpccnt[NFSPROC_STATFS]++; 115 cred = crget(); 116 cred->cr_ngroups = 1; 117 nfsm_reqhead(nfs_procids[NFSPROC_STATFS], cred, NFSX_FH); 118 nfsm_fhtom(vp); 119 nfsm_request(vp, NFSPROC_STATFS, p, 0); 120 nfsm_disect(sfp, struct nfsv2_statfs *, NFSX_STATFS); 121 sbp->f_type = MOUNT_NFS; 122 sbp->f_flags = nmp->nm_flag; 123 sbp->f_bsize = fxdr_unsigned(long, sfp->sf_tsize); 124 sbp->f_fsize = fxdr_unsigned(long, sfp->sf_bsize); 125 sbp->f_blocks = fxdr_unsigned(long, sfp->sf_blocks); 126 sbp->f_bfree = fxdr_unsigned(long, sfp->sf_bfree); 127 sbp->f_bavail = fxdr_unsigned(long, sfp->sf_bavail); 128 sbp->f_files = 0; 129 sbp->f_ffree = 0; 130 if (sbp != &mp->mnt_stat) { 131 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 132 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 133 } 134 nfsm_reqdone; 135 nfs_nput(vp); 136 crfree(cred); 137 return (error); 138 } 139 140 /* 141 * Mount a remote root fs via. nfs. This depends on the info in the 142 * nfs_diskless structure that has been filled in properly by some primary 143 * bootstrap. 144 * It goes something like this: 145 * - do enough of "ifconfig" by calling ifioctl() so that the system 146 * can talk to the server 147 * - If nfs_diskless.mygateway is filled in, use that address as 148 * a default gateway. 149 * (This is done the 4.3 way with rtioctl() and should be changed) 150 * - hand craft the swap nfs vnode hanging off a fake mount point 151 * - build the rootfs mount point and call mountnfs() to do the rest. 152 */ 153 nfs_mountroot() 154 { 155 register struct mount *mp; 156 register struct mbuf *m; 157 struct socket *so; 158 struct vnode *vp; 159 int error; 160 161 /* 162 * Do enough of ifconfig(8) so that critical net interface can 163 * talk to the server. 164 */ 165 if (socreate(nfs_diskless.myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0)) 166 panic("nfs ifconf"); 167 if (ifioctl(so, SIOCAIFADDR, &nfs_diskless.myif)) 168 panic("nfs ifconf2"); 169 soclose(so); 170 171 /* 172 * If the gateway field is filled in, set it as the default route. 173 */ 174 #ifdef COMPAT_43 175 if (nfs_diskless.mygateway.sa_family == AF_INET) { 176 struct ortentry rt; 177 struct sockaddr_in *sin; 178 179 sin = (struct sockaddr_in *) &rt.rt_dst; 180 sin->sin_len = sizeof (struct sockaddr_in); 181 sin->sin_family = AF_INET; 182 sin->sin_addr.s_addr = 0; /* default */ 183 bcopy((caddr_t)&nfs_diskless.mygateway, (caddr_t)&rt.rt_gateway, 184 sizeof (struct sockaddr_in)); 185 rt.rt_flags = (RTF_UP | RTF_GATEWAY); 186 if (rtioctl(SIOCADDRT, (caddr_t)&rt, curproc)) 187 panic("nfs root route"); 188 } 189 #endif /* COMPAT_43 */ 190 191 /* 192 * If swapping to an nfs node (indicated by swdevt[0].sw_dev == NODEV): 193 * Create a fake mount point just for the swap vnode so that the 194 * swap file can be on a different server from the rootfs. 195 */ 196 if (swdevt[0].sw_dev == NODEV) { 197 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 198 M_MOUNT, M_NOWAIT); 199 if (mp == NULL) 200 panic("nfs root mount"); 201 mp->mnt_op = &nfs_vfsops; 202 mp->mnt_flag = 0; 203 mp->mnt_exroot = 0; 204 mp->mnt_mounth = NULLVP; 205 206 /* 207 * Set up the diskless nfs_args for the swap mount point 208 * and then call mountnfs() to mount it. 209 * Since the swap file is not the root dir of a file system, 210 * hack it to a regular file. 211 */ 212 nfs_diskless.swap_args.fh = (nfsv2fh_t *)nfs_diskless.swap_fh; 213 MGET(m, MT_SONAME, M_DONTWAIT); 214 if (m == NULL) 215 panic("nfs root mbuf"); 216 bcopy((caddr_t)&nfs_diskless.swap_saddr, mtod(m, caddr_t), 217 nfs_diskless.swap_saddr.sa_len); 218 m->m_len = nfs_diskless.swap_saddr.sa_len; 219 if (mountnfs(&nfs_diskless.swap_args, mp, m, "/swap", 220 nfs_diskless.swap_hostnam, &vp)) 221 panic("nfs swap"); 222 vp->v_type = VREG; 223 vp->v_flag = 0; 224 swapdev_vp = vp; 225 VREF(vp); 226 swdevt[0].sw_vp = vp; 227 { 228 struct vattr attr; 229 230 if (nfs_dogetattr(vp,&attr,NOCRED,0,0)) { 231 panic("nfs swap"); 232 } 233 swdevt[0].sw_nblks = attr.va_size / DEV_BSIZE; 234 } 235 } 236 237 /* 238 * Create the rootfs mount point. 239 */ 240 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 241 M_MOUNT, M_NOWAIT); 242 if (mp == NULL) 243 panic("nfs root mount2"); 244 mp->mnt_op = &nfs_vfsops; 245 mp->mnt_flag = MNT_RDONLY; 246 mp->mnt_exroot = 0; 247 mp->mnt_mounth = NULLVP; 248 249 /* 250 * Set up the root fs args and call mountnfs() to do the rest. 251 */ 252 nfs_diskless.root_args.fh = (nfsv2fh_t *)nfs_diskless.root_fh; 253 MGET(m, MT_SONAME, M_DONTWAIT); 254 if (m == NULL) 255 panic("nfs root mbuf2"); 256 bcopy((caddr_t)&nfs_diskless.root_saddr, mtod(m, caddr_t), 257 nfs_diskless.root_saddr.sa_len); 258 m->m_len = nfs_diskless.root_saddr.sa_len; 259 if (mountnfs(&nfs_diskless.root_args, mp, m, "/", 260 nfs_diskless.root_hostnam, &vp)) 261 panic("nfs root"); 262 if (vfs_lock(mp)) 263 panic("nfs root2"); 264 rootfs = mp; 265 mp->mnt_next = mp; 266 mp->mnt_prev = mp; 267 mp->mnt_vnodecovered = NULLVP; 268 vfs_unlock(mp); 269 rootvp = vp; 270 inittodr((time_t)0); /* There is no time in the nfs fsstat so ?? */ 271 return (0); 272 } 273 274 static void 275 nfs_decode_flags(argp, nmp) 276 struct nfs_args *argp; 277 struct nfsmount *nmp; 278 { 279 int s = splnet(); 280 281 /* Don't touch the lock flags */ 282 nmp->nm_flag = (argp->flags & ~(NFSMNT_LOCKBITS)) | 283 (nmp->nm_flag & NFSMNT_LOCKBITS); 284 splx(s); 285 286 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 287 nmp->nm_rto = argp->timeo; 288 /* NFS timeouts are specified in 1/10 sec. */ 289 nmp->nm_rto = (nmp->nm_rto * 10) / NFS_HZ; 290 if (nmp->nm_rto < NFS_MINTIMEO) 291 nmp->nm_rto = NFS_MINTIMEO; 292 else if (nmp->nm_rto > NFS_MAXTIMEO) 293 nmp->nm_rto = NFS_MAXTIMEO; 294 nmp->nm_rttvar = nmp->nm_rto << 1; 295 } 296 297 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 298 nmp->nm_retry = argp->retrans; 299 if (nmp->nm_retry > NFS_MAXREXMIT) 300 nmp->nm_retry = NFS_MAXREXMIT; 301 } 302 303 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 304 nmp->nm_wsize = argp->wsize; 305 /* Round down to multiple of blocksize */ 306 nmp->nm_wsize &= ~0x1ff; 307 if (nmp->nm_wsize <= 0) 308 nmp->nm_wsize = 512; 309 else if (nmp->nm_wsize > NFS_MAXDATA) 310 nmp->nm_wsize = NFS_MAXDATA; 311 } 312 if (nmp->nm_wsize > MAXBSIZE) 313 nmp->nm_wsize = MAXBSIZE; 314 315 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 316 nmp->nm_rsize = argp->rsize; 317 /* Round down to multiple of blocksize */ 318 nmp->nm_rsize &= ~0x1ff; 319 if (nmp->nm_rsize <= 0) 320 nmp->nm_rsize = 512; 321 else if (nmp->nm_rsize > NFS_MAXDATA) 322 nmp->nm_rsize = NFS_MAXDATA; 323 } 324 if (nmp->nm_rsize > MAXBSIZE) 325 nmp->nm_rsize = MAXBSIZE; 326 } 327 328 /* 329 * VFS Operations. 330 * 331 * mount system call 332 * It seems a bit dumb to copyinstr() the host and path here and then 333 * bcopy() them in mountnfs(), but I wanted to detect errors before 334 * doing the sockargs() call because sockargs() allocates an mbuf and 335 * an error after that means that I have to release the mbuf. 336 */ 337 /* ARGSUSED */ 338 nfs_mount(mp, path, data, ndp, p) 339 struct mount *mp; 340 char *path; 341 caddr_t data; 342 struct nameidata *ndp; 343 struct proc *p; 344 { 345 int error; 346 struct nfs_args args; 347 struct mbuf *nam; 348 struct vnode *vp; 349 char pth[MNAMELEN], hst[MNAMELEN]; 350 u_int len; 351 nfsv2fh_t nfh; 352 353 if (error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args))) 354 return (error); 355 if (mp->mnt_flag & MNT_UPDATE) { 356 register struct nfsmount *nmp = VFSTONFS(mp); 357 358 if (nmp == NULL) 359 return EIO; 360 nfs_decode_flags(&args, nmp); 361 return (0); 362 } 363 if (error = copyin((caddr_t)args.fh, (caddr_t)&nfh, sizeof (nfsv2fh_t))) 364 return (error); 365 if (error = copyinstr(path, pth, MNAMELEN-1, &len)) 366 return (error); 367 bzero(&pth[len], MNAMELEN - len); 368 if (error = copyinstr(args.hostname, hst, MNAMELEN-1, &len)) 369 return (error); 370 bzero(&hst[len], MNAMELEN - len); 371 /* sockargs() call must be after above copyin() calls */ 372 if (error = sockargs(&nam, (caddr_t)args.addr, 373 sizeof (struct sockaddr), MT_SONAME)) 374 return (error); 375 args.fh = &nfh; 376 error = mountnfs(&args, mp, nam, pth, hst, &vp); 377 return (error); 378 } 379 380 /* 381 * Common code for mount and mountroot 382 */ 383 mountnfs(argp, mp, nam, pth, hst, vpp) 384 register struct nfs_args *argp; 385 register struct mount *mp; 386 struct mbuf *nam; 387 char *pth, *hst; 388 struct vnode **vpp; 389 { 390 register struct nfsmount *nmp; 391 struct proc *p = curproc; /* XXX */ 392 struct nfsnode *np; 393 int error; 394 fsid_t tfsid; 395 396 MALLOC(nmp, struct nfsmount *, sizeof *nmp, M_NFSMNT, M_WAITOK); 397 bzero((caddr_t)nmp, sizeof *nmp); 398 mp->mnt_data = (qaddr_t)nmp; 399 400 getnewfsid(mp, MOUNT_NFS); 401 nmp->nm_mountp = mp; 402 nmp->nm_rto = NFS_TIMEO; 403 nmp->nm_rtt = -1; 404 nmp->nm_rttvar = nmp->nm_rto << 1; 405 nmp->nm_retry = NFS_RETRANS; 406 nmp->nm_wsize = NFS_WSIZE; 407 nmp->nm_rsize = NFS_RSIZE; 408 bcopy((caddr_t)argp->fh, (caddr_t)&nmp->nm_fh, sizeof(nfsv2fh_t)); 409 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 410 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 411 nmp->nm_nam = nam; 412 nfs_decode_flags(argp, nmp); 413 414 /* Set up the sockets and per-host congestion */ 415 nmp->nm_sotype = argp->sotype; 416 nmp->nm_soproto = argp->proto; 417 if (error = nfs_connect(nmp)) 418 goto bad; 419 420 if (error = nfs_statfs(mp, &mp->mnt_stat, p)) 421 goto bad; 422 /* 423 * A reference count is needed on the nfsnode representing the 424 * remote root. If this object is not persistent, then backward 425 * traversals of the mount point (i.e. "..") will not work if 426 * the nfsnode gets flushed out of the cache. Ufs does not have 427 * this problem, because one can identify root inodes by their 428 * number == ROOTINO (2). 429 */ 430 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 431 goto bad; 432 /* 433 * Unlock it, but keep the reference count. 434 */ 435 nfs_unlock(NFSTOV(np)); 436 *vpp = NFSTOV(np); 437 438 return (0); 439 bad: 440 nfs_disconnect(nmp); 441 FREE(nmp, M_NFSMNT); 442 m_freem(nam); 443 return (error); 444 } 445 446 /* 447 * unmount system call 448 */ 449 nfs_unmount(mp, mntflags, p) 450 struct mount *mp; 451 int mntflags; 452 struct proc *p; 453 { 454 register struct nfsmount *nmp; 455 struct nfsnode *np; 456 struct vnode *vp; 457 int error, flags = 0; 458 extern int doforce; 459 460 if (mntflags & MNT_FORCE) { 461 if (!doforce || mp == rootfs) 462 return (EINVAL); 463 flags |= FORCECLOSE; 464 } 465 nmp = VFSTONFS(mp); 466 /* 467 * Clear out the buffer cache 468 */ 469 mntflushbuf(mp, 0); 470 if (mntinvalbuf(mp)) 471 return (EBUSY); 472 /* 473 * Goes something like this.. 474 * - Check for activity on the root vnode (other than ourselves). 475 * - Call vflush() to clear out vnodes for this file system, 476 * except for the root vnode. 477 * - Decrement reference on the vnode representing remote root. 478 * - Close the socket 479 * - Free up the data structures 480 */ 481 /* 482 * We need to decrement the ref. count on the nfsnode representing 483 * the remote root. See comment in mountnfs(). The VFS unmount() 484 * has done vput on this vnode, otherwise we would get deadlock! 485 */ 486 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 487 return(error); 488 vp = NFSTOV(np); 489 if (vp->v_usecount > 2) { 490 vput(vp); 491 return (EBUSY); 492 } 493 if (error = vflush(mp, vp, flags)) { 494 vput(vp); 495 return (error); 496 } 497 /* 498 * Get rid of two reference counts, and unlock it on the second. 499 */ 500 vrele(vp); 501 vput(vp); 502 nfs_disconnect(nmp); 503 m_freem(nmp->nm_nam); 504 free((caddr_t)nmp, M_NFSMNT); 505 return (0); 506 } 507 508 /* 509 * Return root of a filesystem 510 */ 511 nfs_root(mp, vpp) 512 struct mount *mp; 513 struct vnode **vpp; 514 { 515 register struct vnode *vp; 516 struct nfsmount *nmp; 517 struct nfsnode *np; 518 int error; 519 520 nmp = VFSTONFS(mp); 521 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 522 return (error); 523 vp = NFSTOV(np); 524 vp->v_type = VDIR; 525 vp->v_flag = VROOT; 526 *vpp = vp; 527 return (0); 528 } 529 530 extern int syncprt; 531 532 /* 533 * Flush out the buffer cache 534 */ 535 /* ARGSUSED */ 536 nfs_sync(mp, waitfor) 537 struct mount *mp; 538 int waitfor; 539 { 540 if (syncprt) 541 bufstats(); 542 /* 543 * Force stale buffer cache information to be flushed. 544 */ 545 mntflushbuf(mp, waitfor == MNT_WAIT ? B_SYNC : 0); 546 return (0); 547 } 548 549 /* 550 * At this point, this should never happen 551 */ 552 /* ARGSUSED */ 553 nfs_fhtovp(mp, fhp, vpp) 554 struct mount *mp; 555 struct fid *fhp; 556 struct vnode **vpp; 557 { 558 559 return (EINVAL); 560 } 561 562 /* 563 * Vnode pointer to File handle, should never happen either 564 */ 565 /* ARGSUSED */ 566 nfs_vptofh(vp, fhp) 567 struct vnode *vp; 568 struct fid *fhp; 569 { 570 571 return (EINVAL); 572 } 573 574 /* 575 * Vfs start routine, a no-op. 576 */ 577 /* ARGSUSED */ 578 nfs_start(mp, flags, p) 579 struct mount *mp; 580 int flags; 581 struct proc *p; 582 { 583 584 return (0); 585 } 586 587 /* 588 * Do operations associated with quotas, not supported 589 */ 590 nfs_quotactl(mp, cmd, uid, arg, p) 591 struct mount *mp; 592 int cmd; 593 uid_t uid; 594 caddr_t arg; 595 struct proc *p; 596 { 597 #ifdef lint 598 mp = mp; cmd = cmd; uid = uid; arg = arg; 599 #endif /* lint */ 600 return (EOPNOTSUPP); 601 } 602
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