nfs_vfsops.c revision 1.149
1 /* $NetBSD: nfs_vfsops.c,v 1.149 2005/09/19 00:49:52 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.149 2005/09/19 00:49:52 christos Exp $"); 39 40 #if defined(_KERNEL_OPT) 41 #include "opt_compat_netbsd.h" 42 #include "opt_nfs.h" 43 #endif 44 45 #include <sys/param.h> 46 #include <sys/ioctl.h> 47 #include <sys/signal.h> 48 #include <sys/proc.h> 49 #include <sys/namei.h> 50 #include <sys/device.h> 51 #include <sys/vnode.h> 52 #include <sys/kernel.h> 53 #include <sys/mount.h> 54 #include <sys/buf.h> 55 #include <sys/mbuf.h> 56 #include <sys/dirent.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/sysctl.h> 60 #include <sys/systm.h> 61 62 #include <net/if.h> 63 #include <net/route.h> 64 #include <netinet/in.h> 65 66 #include <nfs/rpcv2.h> 67 #include <nfs/nfsproto.h> 68 #include <nfs/nfsnode.h> 69 #include <nfs/nfs.h> 70 #include <nfs/nfsmount.h> 71 #include <nfs/xdr_subs.h> 72 #include <nfs/nfsm_subs.h> 73 #include <nfs/nfsdiskless.h> 74 #include <nfs/nqnfs.h> 75 #include <nfs/nfs_var.h> 76 77 extern struct nfsstats nfsstats; 78 extern int nfs_ticks; 79 80 MALLOC_DEFINE(M_NFSMNT, "NFS mount", "NFS mount structure"); 81 82 /* 83 * nfs vfs operations. 84 */ 85 86 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 87 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 88 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 89 90 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 91 &nfsv2_vnodeop_opv_desc, 92 &spec_nfsv2nodeop_opv_desc, 93 &fifo_nfsv2nodeop_opv_desc, 94 NULL, 95 }; 96 97 struct vfsops nfs_vfsops = { 98 MOUNT_NFS, 99 nfs_mount, 100 nfs_start, 101 nfs_unmount, 102 nfs_root, 103 nfs_quotactl, 104 nfs_statvfs, 105 nfs_sync, 106 nfs_vget, 107 nfs_fhtovp, 108 nfs_vptofh, 109 nfs_vfs_init, 110 nfs_vfs_reinit, 111 nfs_vfs_done, 112 NULL, 113 nfs_mountroot, 114 nfs_checkexp, 115 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 116 vfs_stdextattrctl, 117 nfs_vnodeopv_descs, 118 }; 119 VFS_ATTACH(nfs_vfsops); 120 121 extern u_int32_t nfs_procids[NFS_NPROCS]; 122 extern u_int32_t nfs_prog, nfs_vers; 123 124 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 125 struct mount **, struct vnode **, struct proc *)); 126 127 /* 128 * nfs statvfs call 129 */ 130 int 131 nfs_statvfs(mp, sbp, p) 132 struct mount *mp; 133 struct statvfs *sbp; 134 struct proc *p; 135 { 136 struct vnode *vp; 137 struct nfs_statfs *sfp; 138 caddr_t cp; 139 u_int32_t *tl; 140 int32_t t1, t2; 141 caddr_t bpos, dpos, cp2; 142 struct nfsmount *nmp = VFSTONFS(mp); 143 int error = 0, retattr; 144 #ifdef NFS_V2_ONLY 145 const int v3 = 0; 146 #else 147 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 148 #endif 149 struct mbuf *mreq, *mrep = NULL, *md, *mb; 150 struct ucred *cred; 151 u_quad_t tquad; 152 struct nfsnode *np; 153 154 #ifndef nolint 155 sfp = (struct nfs_statfs *)0; 156 #endif 157 vp = nmp->nm_vnode; 158 np = VTONFS(vp); 159 cred = crget(); 160 cred->cr_ngroups = 0; 161 #ifndef NFS_V2_ONLY 162 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 163 (void)nfs_fsinfo(nmp, vp, cred, p); 164 #endif 165 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 166 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 167 nfsm_fhtom(np, v3); 168 nfsm_request(np, NFSPROC_FSSTAT, p, cred); 169 if (v3) 170 nfsm_postop_attr(vp, retattr, 0); 171 if (error) { 172 if (mrep != NULL) { 173 if (mrep->m_next != NULL) 174 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 175 m_freem(mrep); 176 } 177 goto nfsmout; 178 } 179 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 180 sbp->f_flag = nmp->nm_flag; 181 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 182 if (v3) { 183 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 184 tquad = fxdr_hyper(&sfp->sf_tbytes); 185 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 186 tquad = fxdr_hyper(&sfp->sf_fbytes); 187 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 188 tquad = fxdr_hyper(&sfp->sf_abytes); 189 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 190 sbp->f_bresvd = sbp->f_bfree - tquad; 191 sbp->f_bavail = tquad; 192 #ifdef COMPAT_20 193 /* Handle older NFS servers returning negative values */ 194 if ((quad_t)sbp->f_bavail < 0) 195 sbp->f_bavail = 0; 196 #endif 197 tquad = fxdr_hyper(&sfp->sf_tfiles); 198 sbp->f_files = tquad; 199 tquad = fxdr_hyper(&sfp->sf_ffiles); 200 sbp->f_ffree = tquad; 201 sbp->f_favail = tquad; 202 sbp->f_fresvd = 0; 203 sbp->f_namemax = MAXNAMLEN; 204 } else { 205 sbp->f_bsize = NFS_FABLKSIZE; 206 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 207 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 208 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 209 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 210 sbp->f_fresvd = 0; 211 sbp->f_files = 0; 212 sbp->f_ffree = 0; 213 sbp->f_favail = 0; 214 sbp->f_fresvd = 0; 215 sbp->f_namemax = MAXNAMLEN; 216 } 217 copy_statvfs_info(sbp, mp); 218 nfsm_reqdone; 219 crfree(cred); 220 return (error); 221 } 222 223 #ifndef NFS_V2_ONLY 224 /* 225 * nfs version 3 fsinfo rpc call 226 */ 227 int 228 nfs_fsinfo(nmp, vp, cred, p) 229 struct nfsmount *nmp; 230 struct vnode *vp; 231 struct ucred *cred; 232 struct proc *p; 233 { 234 struct nfsv3_fsinfo *fsp; 235 caddr_t cp; 236 int32_t t1, t2; 237 u_int32_t *tl, pref, xmax; 238 caddr_t bpos, dpos, cp2; 239 int error = 0, retattr; 240 struct mbuf *mreq, *mrep, *md, *mb; 241 u_int64_t maxfsize; 242 struct nfsnode *np = VTONFS(vp); 243 244 nfsstats.rpccnt[NFSPROC_FSINFO]++; 245 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 246 nfsm_fhtom(np, 1); 247 nfsm_request(np, NFSPROC_FSINFO, p, cred); 248 nfsm_postop_attr(vp, retattr, 0); 249 if (!error) { 250 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 251 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 252 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 253 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 254 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 255 ~(NFS_FABLKSIZE - 1); 256 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 257 if (xmax < nmp->nm_wsize && xmax > 0) { 258 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1); 259 if (nmp->nm_wsize == 0) 260 nmp->nm_wsize = xmax; 261 } 262 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 263 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 264 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 265 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 266 ~(NFS_FABLKSIZE - 1); 267 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 268 if (xmax < nmp->nm_rsize && xmax > 0) { 269 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1); 270 if (nmp->nm_rsize == 0) 271 nmp->nm_rsize = xmax; 272 } 273 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 274 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 275 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 276 ~(NFS_DIRFRAGSIZ - 1); 277 if (xmax < nmp->nm_readdirsize && xmax > 0) { 278 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1); 279 if (nmp->nm_readdirsize == 0) 280 nmp->nm_readdirsize = xmax; 281 } 282 /* XXX */ 283 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 284 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 285 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 286 nmp->nm_maxfilesize = maxfsize; 287 nmp->nm_mountp->mnt_fs_bshift = 288 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 289 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 290 } 291 nfsm_reqdone; 292 return (error); 293 } 294 #endif 295 296 /* 297 * Mount a remote root fs via. NFS. It goes like this: 298 * - Call nfs_boot_init() to fill in the nfs_diskless struct 299 * - build the rootfs mount point and call mountnfs() to do the rest. 300 */ 301 int 302 nfs_mountroot() 303 { 304 struct nfs_diskless *nd; 305 struct vattr attr; 306 struct mount *mp; 307 struct vnode *vp; 308 struct proc *procp; 309 long n; 310 int error; 311 312 procp = curproc; /* XXX */ 313 314 if (root_device->dv_class != DV_IFNET) 315 return (ENODEV); 316 317 /* 318 * XXX time must be non-zero when we init the interface or else 319 * the arp code will wedge. [Fixed now in if_ether.c] 320 * However, the NFS attribute cache gives false "hits" when 321 * time.tv_sec < NFS_ATTRTIMEO(nmp, np) so keep this in for now. 322 */ 323 if (time.tv_sec < NFS_MAXATTRTIMO) 324 time.tv_sec = NFS_MAXATTRTIMO; 325 326 /* 327 * Call nfs_boot_init() to fill in the nfs_diskless struct. 328 * Side effect: Finds and configures a network interface. 329 */ 330 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 331 memset((caddr_t)nd, 0, sizeof(*nd)); 332 error = nfs_boot_init(nd, procp); 333 if (error) { 334 free(nd, M_NFSMNT); 335 return (error); 336 } 337 338 /* 339 * Create the root mount point. 340 */ 341 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, procp); 342 if (error) 343 goto out; 344 printf("root on %s\n", nd->nd_root.ndm_host); 345 346 /* 347 * Link it into the mount list. 348 */ 349 simple_lock(&mountlist_slock); 350 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 351 simple_unlock(&mountlist_slock); 352 rootvp = vp; 353 mp->mnt_vnodecovered = NULLVP; 354 vfs_unbusy(mp); 355 356 /* Get root attributes (for the time). */ 357 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 358 if (error) 359 panic("nfs_mountroot: getattr for root"); 360 n = attr.va_atime.tv_sec; 361 #ifdef DEBUG 362 printf("root time: 0x%lx\n", n); 363 #endif 364 setrootfstime(n); 365 366 out: 367 if (error) 368 nfs_boot_cleanup(nd, procp); 369 free(nd, M_NFSMNT); 370 return (error); 371 } 372 373 /* 374 * Internal version of mount system call for diskless setup. 375 * Separate function because we used to call it twice. 376 * (once for root and once for swap) 377 */ 378 static int 379 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, p) 380 struct nfs_dlmount *ndmntp; 381 const char *mntname; /* mount point name */ 382 struct mount **mpp; 383 struct vnode **vpp; 384 struct proc *p; 385 { 386 struct mount *mp; 387 struct mbuf *m; 388 int error; 389 390 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp); 391 392 mp->mnt_op = &nfs_vfsops; 393 394 /* 395 * Historical practice expects NFS root file systems to 396 * be initially mounted r/w. 397 */ 398 mp->mnt_flag &= ~MNT_RDONLY; 399 400 /* Get mbuf for server sockaddr. */ 401 m = m_get(M_WAIT, MT_SONAME); 402 if (m == NULL) 403 panic("nfs_mountroot: mget soname for %s", mntname); 404 MCLAIM(m, &nfs_mowner); 405 memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr, 406 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 407 408 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 409 ndmntp->ndm_args.hostname, vpp, p); 410 if (error) { 411 mp->mnt_op->vfs_refcount--; 412 vfs_unbusy(mp); 413 printf("nfs_mountroot: mount %s failed: %d\n", 414 mntname, error); 415 free(mp, M_MOUNT); 416 } else 417 *mpp = mp; 418 419 return (error); 420 } 421 422 void 423 nfs_decode_args(nmp, argp, p) 424 struct nfsmount *nmp; 425 struct nfs_args *argp; 426 struct proc *p; 427 { 428 int s; 429 int adjsock; 430 int maxio; 431 432 s = splsoftnet(); 433 434 /* 435 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 436 * no sense in that context. 437 */ 438 if (argp->sotype == SOCK_STREAM) 439 argp->flags &= ~NFSMNT_NOCONN; 440 441 /* 442 * Cookie translation is not needed for v2, silently ignore it. 443 */ 444 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 445 NFSMNT_XLATECOOKIE) 446 argp->flags &= ~NFSMNT_XLATECOOKIE; 447 448 /* Re-bind if rsrvd port requested and wasn't on one */ 449 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 450 && (argp->flags & NFSMNT_RESVPORT); 451 /* Also re-bind if we're switching to/from a connected UDP socket */ 452 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 453 (argp->flags & NFSMNT_NOCONN)); 454 455 /* Update flags. */ 456 nmp->nm_flag = argp->flags; 457 splx(s); 458 459 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 460 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 461 if (nmp->nm_timeo < NFS_MINTIMEO) 462 nmp->nm_timeo = NFS_MINTIMEO; 463 else if (nmp->nm_timeo > NFS_MAXTIMEO) 464 nmp->nm_timeo = NFS_MAXTIMEO; 465 } 466 467 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 468 nmp->nm_retry = argp->retrans; 469 if (nmp->nm_retry > NFS_MAXREXMIT) 470 nmp->nm_retry = NFS_MAXREXMIT; 471 } 472 473 #ifndef NFS_V2_ONLY 474 if (argp->flags & NFSMNT_NFSV3) { 475 if (argp->sotype == SOCK_DGRAM) 476 maxio = NFS_MAXDGRAMDATA; 477 else 478 maxio = NFS_MAXDATA; 479 } else 480 #endif 481 maxio = NFS_V2MAXDATA; 482 483 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 484 int osize = nmp->nm_wsize; 485 nmp->nm_wsize = argp->wsize; 486 /* Round down to multiple of blocksize */ 487 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 488 if (nmp->nm_wsize <= 0) 489 nmp->nm_wsize = NFS_FABLKSIZE; 490 adjsock |= (nmp->nm_wsize != osize); 491 } 492 if (nmp->nm_wsize > maxio) 493 nmp->nm_wsize = maxio; 494 if (nmp->nm_wsize > MAXBSIZE) 495 nmp->nm_wsize = MAXBSIZE; 496 497 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 498 int osize = nmp->nm_rsize; 499 nmp->nm_rsize = argp->rsize; 500 /* Round down to multiple of blocksize */ 501 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 502 if (nmp->nm_rsize <= 0) 503 nmp->nm_rsize = NFS_FABLKSIZE; 504 adjsock |= (nmp->nm_rsize != osize); 505 } 506 if (nmp->nm_rsize > maxio) 507 nmp->nm_rsize = maxio; 508 if (nmp->nm_rsize > MAXBSIZE) 509 nmp->nm_rsize = MAXBSIZE; 510 511 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 512 nmp->nm_readdirsize = argp->readdirsize; 513 /* Round down to multiple of minimum blocksize */ 514 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 515 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 516 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 517 /* Bigger than buffer size makes no sense */ 518 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 519 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 520 } else if (argp->flags & NFSMNT_RSIZE) 521 nmp->nm_readdirsize = nmp->nm_rsize; 522 523 if (nmp->nm_readdirsize > maxio) 524 nmp->nm_readdirsize = maxio; 525 526 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 527 argp->maxgrouplist <= NFS_MAXGRPS) 528 nmp->nm_numgrps = argp->maxgrouplist; 529 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 530 argp->readahead <= NFS_MAXRAHEAD) 531 nmp->nm_readahead = argp->readahead; 532 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 533 argp->leaseterm <= NQ_MAXLEASE) 534 nmp->nm_leaseterm = argp->leaseterm; 535 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 536 argp->deadthresh <= NQ_NEVERDEAD) 537 nmp->nm_deadthresh = argp->deadthresh; 538 539 adjsock |= ((nmp->nm_sotype != argp->sotype) || 540 (nmp->nm_soproto != argp->proto)); 541 nmp->nm_sotype = argp->sotype; 542 nmp->nm_soproto = argp->proto; 543 544 if (nmp->nm_so && adjsock) { 545 nfs_safedisconnect(nmp); 546 if (nmp->nm_sotype == SOCK_DGRAM) 547 while (nfs_connect(nmp, (struct nfsreq *)0, p)) { 548 printf("nfs_args: retrying connect\n"); 549 (void) tsleep((caddr_t)&lbolt, 550 PSOCK, "nfscn3", 0); 551 } 552 } 553 } 554 555 /* 556 * VFS Operations. 557 * 558 * mount system call 559 * It seems a bit dumb to copyinstr() the host and path here and then 560 * memcpy() them in mountnfs(), but I wanted to detect errors before 561 * doing the sockargs() call because sockargs() allocates an mbuf and 562 * an error after that means that I have to release the mbuf. 563 */ 564 /* ARGSUSED */ 565 int 566 nfs_mount(mp, path, data, ndp, p) 567 struct mount *mp; 568 const char *path; 569 void *data; 570 struct nameidata *ndp; 571 struct proc *p; 572 { 573 int error; 574 struct nfs_args args; 575 struct mbuf *nam; 576 struct nfsmount *nmp = VFSTONFS(mp); 577 struct sockaddr *sa; 578 struct vnode *vp; 579 char *pth, *hst; 580 size_t len; 581 u_char *nfh; 582 583 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 584 if (error) 585 return (error); 586 587 if (mp->mnt_flag & MNT_GETARGS) { 588 589 if (nmp == NULL) 590 return (EIO); 591 if (args.addr != NULL) { 592 sa = mtod(nmp->nm_nam, struct sockaddr *); 593 error = copyout(sa, args.addr, sa->sa_len); 594 if (error) 595 return (error); 596 args.addrlen = sa->sa_len; 597 } else 598 args.addrlen = 0; 599 600 args.version = NFS_ARGSVERSION; 601 args.sotype = nmp->nm_sotype; 602 args.proto = nmp->nm_soproto; 603 args.fh = NULL; 604 args.fhsize = 0; 605 args.flags = nmp->nm_flag; 606 args.wsize = nmp->nm_wsize; 607 args.rsize = nmp->nm_rsize; 608 args.readdirsize = nmp->nm_readdirsize; 609 args.timeo = nmp->nm_timeo; 610 args.retrans = nmp->nm_retry; 611 args.maxgrouplist = nmp->nm_numgrps; 612 args.readahead = nmp->nm_readahead; 613 args.leaseterm = nmp->nm_leaseterm; 614 args.deadthresh = nmp->nm_deadthresh; 615 args.hostname = NULL; 616 return (copyout(&args, data, sizeof(args))); 617 } 618 619 if (args.version != NFS_ARGSVERSION) 620 return (EPROGMISMATCH); 621 #ifdef NFS_V2_ONLY 622 if (args.flags & NFSMNT_NQNFS) 623 return (EPROGUNAVAIL); 624 if (args.flags & NFSMNT_NFSV3) 625 return (EPROGMISMATCH); 626 #endif 627 if (mp->mnt_flag & MNT_UPDATE) { 628 if (nmp == NULL) 629 return (EIO); 630 /* 631 * When doing an update, we can't change from or to 632 * v3 and/or nqnfs, or change cookie translation 633 */ 634 args.flags = (args.flags & 635 ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) | 636 (nmp->nm_flag & 637 (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)); 638 nfs_decode_args(nmp, &args, p); 639 return (0); 640 } 641 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 642 return (EINVAL); 643 MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK); 644 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 645 if (error) 646 return (error); 647 MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK); 648 error = copyinstr(path, pth, MNAMELEN - 1, &len); 649 if (error) 650 goto free_nfh; 651 memset(&pth[len], 0, MNAMELEN - len); 652 MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK); 653 error = copyinstr(args.hostname, hst, MNAMELEN - 1, &len); 654 if (error) 655 goto free_pth; 656 memset(&hst[len], 0, MNAMELEN - len); 657 /* sockargs() call must be after above copyin() calls */ 658 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 659 if (error) 660 goto free_hst; 661 MCLAIM(nam, &nfs_mowner); 662 args.fh = nfh; 663 error = mountnfs(&args, mp, nam, pth, hst, &vp, p); 664 665 free_hst: 666 FREE(hst, M_TEMP); 667 free_pth: 668 FREE(pth, M_TEMP); 669 free_nfh: 670 FREE(nfh, M_TEMP); 671 672 return (error); 673 } 674 675 /* 676 * Common code for mount and mountroot 677 */ 678 int 679 mountnfs(argp, mp, nam, pth, hst, vpp, p) 680 struct nfs_args *argp; 681 struct mount *mp; 682 struct mbuf *nam; 683 const char *pth, *hst; 684 struct vnode **vpp; 685 struct proc *p; 686 { 687 struct nfsmount *nmp; 688 struct nfsnode *np; 689 int error; 690 struct vattr *attrs; 691 struct ucred *cr; 692 693 /* 694 * If the number of nfs iothreads to use has never 695 * been set, create a reasonable number of them. 696 */ 697 698 if (nfs_niothreads < 0) { 699 nfs_niothreads = NFS_DEFAULT_NIOTHREADS; 700 nfs_getset_niothreads(TRUE); 701 } 702 703 if (mp->mnt_flag & MNT_UPDATE) { 704 nmp = VFSTONFS(mp); 705 /* update paths, file handles, etc, here XXX */ 706 m_freem(nam); 707 return (0); 708 } else { 709 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 710 M_NFSMNT, M_WAITOK); 711 memset((caddr_t)nmp, 0, sizeof (struct nfsmount)); 712 mp->mnt_data = nmp; 713 TAILQ_INIT(&nmp->nm_uidlruhead); 714 TAILQ_INIT(&nmp->nm_bufq); 715 lockinit(&nmp->nm_writeverflock, PRIBIO, "nfswverf", 0, 0); 716 simple_lock_init(&nmp->nm_slock); 717 } 718 vfs_getnewfsid(mp); 719 nmp->nm_mountp = mp; 720 721 #ifndef NFS_V2_ONLY 722 if (argp->flags & NFSMNT_NQNFS) 723 mp->mnt_iflag |= IMNT_DTYPE; 724 #endif 725 726 #ifndef NFS_V2_ONLY 727 if ((argp->flags & NFSMNT_NFSV3) == 0) 728 #endif 729 /* 730 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 731 * will fill this in. 732 */ 733 nmp->nm_maxfilesize = 0xffffffffLL; 734 735 nmp->nm_timeo = NFS_TIMEO; 736 nmp->nm_retry = NFS_RETRANS; 737 nmp->nm_wsize = NFS_WSIZE; 738 nmp->nm_rsize = NFS_RSIZE; 739 nmp->nm_readdirsize = NFS_READDIRSIZE; 740 nmp->nm_numgrps = NFS_MAXGRPS; 741 nmp->nm_readahead = NFS_DEFRAHEAD; 742 nmp->nm_leaseterm = NQ_DEFLEASE; 743 nmp->nm_deadthresh = NQ_DEADTHRESH; 744 CIRCLEQ_INIT(&nmp->nm_timerhead); 745 nmp->nm_inprog = NULLVP; 746 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, mp, p); 747 if (error) 748 goto bad; 749 nmp->nm_nam = nam; 750 751 /* Set up the sockets and per-host congestion */ 752 nmp->nm_sotype = argp->sotype; 753 nmp->nm_soproto = argp->proto; 754 755 nfs_decode_args(nmp, argp, p); 756 757 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 758 mp->mnt_dev_bshift = DEV_BSHIFT; 759 760 /* 761 * For Connection based sockets (TCP,...) defer the connect until 762 * the first request, in case the server is not responding. 763 */ 764 if (nmp->nm_sotype == SOCK_DGRAM && 765 (error = nfs_connect(nmp, (struct nfsreq *)0, p))) 766 goto bad; 767 768 /* 769 * This is silly, but it has to be set so that vinifod() works. 770 * We do not want to do an nfs_statvfs() here since we can get 771 * stuck on a dead server and we are holding a lock on the mount 772 * point. 773 */ 774 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 775 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 776 if (error) 777 goto bad; 778 *vpp = NFSTOV(np); 779 MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK); 780 VOP_GETATTR(*vpp, attrs, p->p_ucred, p); 781 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 782 cr = crget(); 783 cr->cr_uid = attrs->va_uid; 784 cr->cr_gid = attrs->va_gid; 785 cr->cr_ngroups = 0; 786 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, p, cr); 787 crfree(cr); 788 } 789 FREE(attrs, M_TEMP); 790 791 /* 792 * A reference count is needed on the nfsnode representing the 793 * remote root. If this object is not persistent, then backward 794 * traversals of the mount point (i.e. "..") will not work if 795 * the nfsnode gets flushed out of the cache. Ufs does not have 796 * this problem, because one can identify root inodes by their 797 * number == ROOTINO (2). So, just unlock, but no rele. 798 */ 799 800 nmp->nm_vnode = *vpp; 801 VOP_UNLOCK(*vpp, 0); 802 803 return (0); 804 bad: 805 nfs_disconnect(nmp); 806 free((caddr_t)nmp, M_NFSMNT); 807 m_freem(nam); 808 return (error); 809 } 810 811 /* 812 * unmount system call 813 */ 814 int 815 nfs_unmount(mp, mntflags, p) 816 struct mount *mp; 817 int mntflags; 818 struct proc *p; 819 { 820 struct nfsmount *nmp; 821 struct vnode *vp; 822 int error, flags = 0; 823 824 if (mntflags & MNT_FORCE) 825 flags |= FORCECLOSE; 826 nmp = VFSTONFS(mp); 827 /* 828 * Goes something like this.. 829 * - Check for activity on the root vnode (other than ourselves). 830 * - Call vflush() to clear out vnodes for this file system, 831 * except for the root vnode. 832 * - Decrement reference on the vnode representing remote root. 833 * - Close the socket 834 * - Free up the data structures 835 */ 836 /* 837 * We need to decrement the ref. count on the nfsnode representing 838 * the remote root. See comment in mountnfs(). The VFS unmount() 839 * has done vput on this vnode, otherwise we would get deadlock! 840 */ 841 vp = nmp->nm_vnode; 842 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 843 if (error != 0) 844 return error; 845 846 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 847 vput(vp); 848 return (EBUSY); 849 } 850 851 /* 852 * Must handshake with nqnfs_clientd() if it is active. 853 */ 854 nmp->nm_iflag |= NFSMNT_DISMINPROG; 855 while (nmp->nm_inprog != NULLVP) 856 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 857 error = vflush(mp, vp, flags); 858 if (error) { 859 vput(vp); 860 nmp->nm_iflag &= ~NFSMNT_DISMINPROG; 861 return (error); 862 } 863 864 /* 865 * We are now committed to the unmount; mark the mount structure 866 * as doomed so that any sleepers kicked awake by nfs_disconnect 867 * will go away cleanly. 868 */ 869 nmp->nm_iflag |= NFSMNT_DISMNT; 870 871 /* 872 * There are two reference counts to get rid of here 873 * (see comment in mountnfs()). 874 */ 875 vrele(vp); 876 vput(vp); 877 vgone(vp); 878 nfs_disconnect(nmp); 879 m_freem(nmp->nm_nam); 880 881 /* 882 * For NQNFS, let the server daemon free the nfsmount structure. 883 */ 884 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 885 free((caddr_t)nmp, M_NFSMNT); 886 return (0); 887 } 888 889 /* 890 * Return root of a filesystem 891 */ 892 int 893 nfs_root(mp, vpp) 894 struct mount *mp; 895 struct vnode **vpp; 896 { 897 struct vnode *vp; 898 struct nfsmount *nmp; 899 int error; 900 901 nmp = VFSTONFS(mp); 902 vp = nmp->nm_vnode; 903 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 904 if (error != 0) 905 return error; 906 if (vp->v_type == VNON) 907 vp->v_type = VDIR; 908 vp->v_flag = VROOT; 909 *vpp = vp; 910 return (0); 911 } 912 913 extern int syncprt; 914 915 /* 916 * Flush out the buffer cache 917 */ 918 /* ARGSUSED */ 919 int 920 nfs_sync(mp, waitfor, cred, p) 921 struct mount *mp; 922 int waitfor; 923 struct ucred *cred; 924 struct proc *p; 925 { 926 struct vnode *vp; 927 int error, allerror = 0; 928 929 /* 930 * Force stale buffer cache information to be flushed. 931 */ 932 loop: 933 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 934 /* 935 * If the vnode that we are about to sync is no longer 936 * associated with this mount point, start over. 937 */ 938 if (vp->v_mount != mp) 939 goto loop; 940 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 941 (LIST_EMPTY(&vp->v_dirtyblkhd) && 942 vp->v_uobj.uo_npages == 0)) 943 continue; 944 if (vget(vp, LK_EXCLUSIVE)) 945 goto loop; 946 error = VOP_FSYNC(vp, cred, 947 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p); 948 if (error) 949 allerror = error; 950 vput(vp); 951 } 952 return (allerror); 953 } 954 955 /* 956 * NFS flat namespace lookup. 957 * Currently unsupported. 958 */ 959 /* ARGSUSED */ 960 int 961 nfs_vget(mp, ino, vpp) 962 struct mount *mp; 963 ino_t ino; 964 struct vnode **vpp; 965 { 966 967 return (EOPNOTSUPP); 968 } 969 970 /* 971 * Do that sysctl thang... 972 */ 973 static int 974 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 975 { 976 int error; 977 978 nfs_getset_niothreads(0); 979 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 980 if (error || newp == NULL) 981 return (error); 982 nfs_getset_niothreads(1); 983 984 return (0); 985 } 986 987 SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup") 988 { 989 990 sysctl_createv(clog, 0, NULL, NULL, 991 CTLFLAG_PERMANENT, 992 CTLTYPE_NODE, "vfs", NULL, 993 NULL, 0, NULL, 0, 994 CTL_VFS, CTL_EOL); 995 sysctl_createv(clog, 0, NULL, NULL, 996 CTLFLAG_PERMANENT, 997 CTLTYPE_NODE, "nfs", 998 SYSCTL_DESCR("NFS vfs options"), 999 NULL, 0, NULL, 0, 1000 CTL_VFS, 2, CTL_EOL); 1001 /* 1002 * XXX the "2" above could be dynamic, thereby eliminating one 1003 * more instance of the "number to vfs" mapping problem, but 1004 * "2" is the order as taken from sys/mount.h 1005 */ 1006 1007 sysctl_createv(clog, 0, NULL, NULL, 1008 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1009 CTLTYPE_STRUCT, "nfsstats", 1010 SYSCTL_DESCR("NFS operation statistics"), 1011 NULL, 0, &nfsstats, sizeof(nfsstats), 1012 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1013 sysctl_createv(clog, 0, NULL, NULL, 1014 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1015 CTLTYPE_INT, "iothreads", 1016 SYSCTL_DESCR("Number of NFS client processes desired"), 1017 sysctl_vfs_nfs_iothreads, 0, &nfs_niothreads, 0, 1018 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1019 } 1020 1021 /* 1022 * At this point, this should never happen 1023 */ 1024 /* ARGSUSED */ 1025 int 1026 nfs_fhtovp(mp, fhp, vpp) 1027 struct mount *mp; 1028 struct fid *fhp; 1029 struct vnode **vpp; 1030 { 1031 1032 return (EINVAL); 1033 } 1034 1035 /* ARGSUSED */ 1036 int 1037 nfs_checkexp(mp, nam, exflagsp, credanonp) 1038 struct mount *mp; 1039 struct mbuf *nam; 1040 int *exflagsp; 1041 struct ucred **credanonp; 1042 { 1043 1044 return (EINVAL); 1045 } 1046 1047 /* 1048 * Vnode pointer to File handle, should never happen either 1049 */ 1050 /* ARGSUSED */ 1051 int 1052 nfs_vptofh(vp, fhp) 1053 struct vnode *vp; 1054 struct fid *fhp; 1055 { 1056 1057 return (EINVAL); 1058 } 1059 1060 /* 1061 * Vfs start routine, a no-op. 1062 */ 1063 /* ARGSUSED */ 1064 int 1065 nfs_start(mp, flags, p) 1066 struct mount *mp; 1067 int flags; 1068 struct proc *p; 1069 { 1070 1071 return (0); 1072 } 1073 1074 /* 1075 * Do operations associated with quotas, not supported 1076 */ 1077 /* ARGSUSED */ 1078 int 1079 nfs_quotactl(mp, cmd, uid, arg, p) 1080 struct mount *mp; 1081 int cmd; 1082 uid_t uid; 1083 void *arg; 1084 struct proc *p; 1085 { 1086 1087 return (EOPNOTSUPP); 1088 } 1089
Indexes created Wed Sep 24 14:09:57 GMT 2025