1 /* 2 * Copyright (c) 1989, 1993, 1995 3 * The Regents of the University of California. 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 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 37 * $FreeBSD: src/sys/nfs/nfs_vfsops.c,v 1.91.2.7 2003/01/27 20:04:08 dillon Exp $ 38 * $DragonFly: src/sys/vfs/nfs/nfs_vfsops.c,v 1.18 2004/05/19 22:53:05 dillon Exp $ 39 */ 40 41 #include "opt_bootp.h" 42 43 #include <sys/param.h> 44 #include <sys/sockio.h> 45 #include <sys/proc.h> 46 #include <sys/vnode.h> 47 #include <sys/kernel.h> 48 #include <sys/sysctl.h> 49 #include <sys/malloc.h> 50 #include <sys/mount.h> 51 #include <sys/mbuf.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/systm.h> 55 56 #include <vm/vm.h> 57 #include <vm/vm_extern.h> 58 #include <vm/vm_zone.h> 59 60 #include <net/if.h> 61 #include <net/route.h> 62 #include <netinet/in.h> 63 64 #include "rpcv2.h" 65 #include "nfsproto.h" 66 #include "nfs.h" 67 #include "nfsmount.h" 68 #include "nfsnode.h" 69 #include "xdr_subs.h" 70 #include "nfsm_subs.h" 71 #include "nfsdiskless.h" 72 #include "nqnfs.h" 73 74 extern int nfs_mountroot(struct mount *mp); 75 extern void bootpc_init(void); 76 77 extern int nfs_ticks; 78 79 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 80 MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle"); 81 MALLOC_DEFINE(M_NFSD, "NFS daemon", "Nfs server daemon structure"); 82 MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data"); 83 MALLOC_DEFINE(M_NFSRVDESC, "NFSV3 srvdesc", "NFS server socket descriptor"); 84 MALLOC_DEFINE(M_NFSUID, "NFS uid", "Nfs uid mapping structure"); 85 MALLOC_DEFINE(M_NQLEASE, "NQNFS Lease", "Nqnfs lease"); 86 MALLOC_DEFINE(M_NFSHASH, "NFS hash", "NFS hash tables"); 87 88 vm_zone_t nfsmount_zone; 89 90 struct nfsstats nfsstats; 91 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem"); 92 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RD, 93 &nfsstats, nfsstats, ""); 94 static int nfs_ip_paranoia = 1; 95 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW, 96 &nfs_ip_paranoia, 0, ""); 97 #ifdef NFS_DEBUG 98 int nfs_debug; 99 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, ""); 100 #endif 101 102 /* 103 * Tunable to determine the Read/Write unit size. Maximum value 104 * is NFS_MAXDATA. We also default to NFS_MAXDATA. 105 */ 106 static int nfs_io_size = NFS_MAXDATA; 107 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_io_size, CTLFLAG_RW, 108 &nfs_io_size, 0, "NFS optimal I/O unit size"); 109 110 static void nfs_decode_args (struct nfsmount *nmp, 111 struct nfs_args *argp); 112 static int mountnfs (struct nfs_args *,struct mount *, 113 struct sockaddr *,char *,char *,struct vnode **); 114 static int nfs_mount ( struct mount *mp, char *path, caddr_t data, 115 struct nameidata *ndp, struct thread *td); 116 static int nfs_unmount ( struct mount *mp, int mntflags, 117 struct thread *td); 118 static int nfs_root ( struct mount *mp, struct vnode **vpp); 119 static int nfs_statfs ( struct mount *mp, struct statfs *sbp, 120 struct thread *td); 121 static int nfs_sync ( struct mount *mp, int waitfor, 122 struct thread *td); 123 124 /* 125 * nfs vfs operations. 126 */ 127 static struct vfsops nfs_vfsops = { 128 nfs_mount, 129 vfs_stdstart, 130 nfs_unmount, 131 nfs_root, 132 vfs_stdquotactl, 133 nfs_statfs, 134 nfs_sync, 135 vfs_stdvget, 136 vfs_stdfhtovp, /* shouldn't happen */ 137 vfs_stdcheckexp, 138 vfs_stdvptofh, /* shouldn't happen */ 139 nfs_init, 140 nfs_uninit, 141 vfs_stdextattrctl, 142 }; 143 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK); 144 145 /* 146 * This structure must be filled in by a primary bootstrap or bootstrap 147 * server for a diskless/dataless machine. It is initialized below just 148 * to ensure that it is allocated to initialized data (.data not .bss). 149 */ 150 struct nfs_diskless nfs_diskless = { { { 0 } } }; 151 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; 152 int nfs_diskless_valid = 0; 153 154 SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD, 155 &nfs_diskless_valid, 0, ""); 156 157 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD, 158 nfsv3_diskless.root_hostnam, 0, ""); 159 160 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD, 161 &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr, 162 "%Ssockaddr_in", ""); 163 164 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_swappath, CTLFLAG_RD, 165 nfsv3_diskless.swap_hostnam, 0, ""); 166 167 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_swapaddr, CTLFLAG_RD, 168 &nfsv3_diskless.swap_saddr, sizeof nfsv3_diskless.swap_saddr, 169 "%Ssockaddr_in",""); 170 171 172 void nfsargs_ntoh (struct nfs_args *); 173 static int nfs_mountdiskless (char *, char *, int, 174 struct sockaddr_in *, struct nfs_args *, 175 struct thread *, struct vnode **, 176 struct mount **); 177 static void nfs_convert_diskless (void); 178 static void nfs_convert_oargs (struct nfs_args *args, 179 struct onfs_args *oargs); 180 181 /* 182 * Calculate the buffer I/O block size to use. The maximum V2 block size 183 * is typically 8K, the maximum datagram size is typically 16K, and the 184 * maximum V3 block size is typically 32K. The buffer cache tends to work 185 * best with 16K blocks but we allow 32K for TCP connections. 186 * 187 * We force the block size to be at least a page for buffer cache efficiency. 188 */ 189 static 190 int 191 nfs_iosize(int v3, int sotype) 192 { 193 int iosize; 194 int iomax; 195 196 if (v3) { 197 if (sotype == SOCK_STREAM) 198 iomax = NFS_MAXDATA; 199 else 200 iomax = NFS_MAXDGRAMDATA; 201 } else { 202 iomax = NFS_V2MAXDATA; 203 } 204 if ((iosize = nfs_io_size) > iomax) 205 iosize = iomax; 206 if (iosize < PAGE_SIZE) 207 iosize = PAGE_SIZE; 208 209 /* 210 * This is an aweful hack but until the buffer cache is rewritten 211 * we need it. The problem is that when you combine write() with 212 * mmap() the vm_page->valid bits can become weird looking 213 * (e.g. 0xfc). This occurs because NFS uses piecemeal buffers 214 * at the file EOF. To solve the problem the BIO system needs to 215 * be guarenteed that the NFS iosize for regular files will be a 216 * multiple of PAGE_SIZE so it can invalidate the whole page 217 * rather then just the piece of it owned by the buffer when 218 * NFS does vinvalbuf() calls. 219 */ 220 if (iosize & PAGE_MASK) 221 iosize = (iosize & ~PAGE_MASK) + PAGE_SIZE; 222 return iosize; 223 } 224 225 static void 226 nfs_convert_oargs(args, oargs) 227 struct nfs_args *args; 228 struct onfs_args *oargs; 229 { 230 args->version = NFS_ARGSVERSION; 231 args->addr = oargs->addr; 232 args->addrlen = oargs->addrlen; 233 args->sotype = oargs->sotype; 234 args->proto = oargs->proto; 235 args->fh = oargs->fh; 236 args->fhsize = oargs->fhsize; 237 args->flags = oargs->flags; 238 args->wsize = oargs->wsize; 239 args->rsize = oargs->rsize; 240 args->readdirsize = oargs->readdirsize; 241 args->timeo = oargs->timeo; 242 args->retrans = oargs->retrans; 243 args->maxgrouplist = oargs->maxgrouplist; 244 args->readahead = oargs->readahead; 245 args->leaseterm = oargs->leaseterm; 246 args->deadthresh = oargs->deadthresh; 247 args->hostname = oargs->hostname; 248 } 249 250 static void 251 nfs_convert_diskless() 252 { 253 bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif, 254 sizeof(struct ifaliasreq)); 255 bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway, 256 sizeof(struct sockaddr_in)); 257 nfs_convert_oargs(&nfsv3_diskless.swap_args,&nfs_diskless.swap_args); 258 nfsv3_diskless.swap_fhsize = NFSX_V2FH; 259 bcopy(nfs_diskless.swap_fh,nfsv3_diskless.swap_fh,NFSX_V2FH); 260 bcopy(&nfs_diskless.swap_saddr,&nfsv3_diskless.swap_saddr, 261 sizeof(struct sockaddr_in)); 262 bcopy(nfs_diskless.swap_hostnam,nfsv3_diskless.swap_hostnam, MNAMELEN); 263 nfsv3_diskless.swap_nblks = nfs_diskless.swap_nblks; 264 bcopy(&nfs_diskless.swap_ucred, &nfsv3_diskless.swap_ucred, 265 sizeof(struct ucred)); 266 nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args); 267 nfsv3_diskless.root_fhsize = NFSX_V2FH; 268 bcopy(nfs_diskless.root_fh,nfsv3_diskless.root_fh,NFSX_V2FH); 269 bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr, 270 sizeof(struct sockaddr_in)); 271 bcopy(nfs_diskless.root_hostnam,nfsv3_diskless.root_hostnam, MNAMELEN); 272 nfsv3_diskless.root_time = nfs_diskless.root_time; 273 bcopy(nfs_diskless.my_hostnam,nfsv3_diskless.my_hostnam, 274 MAXHOSTNAMELEN); 275 nfs_diskless_valid = 3; 276 } 277 278 /* 279 * nfs statfs call 280 */ 281 int 282 nfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 283 { 284 struct vnode *vp; 285 struct nfs_statfs *sfp; 286 caddr_t cp; 287 u_int32_t *tl; 288 int32_t t1, t2; 289 caddr_t bpos, dpos, cp2; 290 struct nfsmount *nmp = VFSTONFS(mp); 291 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 292 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 293 struct ucred *cred; 294 struct nfsnode *np; 295 u_quad_t tquad; 296 297 #ifndef nolint 298 sfp = (struct nfs_statfs *)0; 299 #endif 300 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 301 if (error) 302 return (error); 303 vp = NFSTOV(np); 304 cred = crget(); 305 cred->cr_ngroups = 1; 306 if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 307 (void)nfs_fsinfo(nmp, vp, td); 308 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 309 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 310 nfsm_fhtom(vp, v3); 311 nfsm_request(vp, NFSPROC_FSSTAT, td, cred); 312 if (v3) 313 nfsm_postop_attr(vp, retattr); 314 if (error) { 315 if (mrep != NULL) 316 m_freem(mrep); 317 goto nfsmout; 318 } 319 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 320 sbp->f_flags = nmp->nm_flag; 321 sbp->f_iosize = nfs_iosize(v3, nmp->nm_sotype); 322 323 if (v3) { 324 sbp->f_bsize = NFS_FABLKSIZE; 325 tquad = fxdr_hyper(&sfp->sf_tbytes); 326 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 327 tquad = fxdr_hyper(&sfp->sf_fbytes); 328 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 329 tquad = fxdr_hyper(&sfp->sf_abytes); 330 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 331 sbp->f_files = (fxdr_unsigned(int32_t, 332 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 333 sbp->f_ffree = (fxdr_unsigned(int32_t, 334 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 335 } else { 336 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 337 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 338 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 339 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 340 sbp->f_files = 0; 341 sbp->f_ffree = 0; 342 } 343 if (sbp != &mp->mnt_stat) { 344 sbp->f_type = mp->mnt_vfc->vfc_typenum; 345 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 346 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 347 } 348 m_freem(mrep); 349 nfsmout: 350 vput(vp); 351 crfree(cred); 352 return (error); 353 } 354 355 /* 356 * nfs version 3 fsinfo rpc call 357 */ 358 int 359 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct thread *td) 360 { 361 struct nfsv3_fsinfo *fsp; 362 caddr_t cp; 363 int32_t t1, t2; 364 u_int32_t *tl, pref, max; 365 caddr_t bpos, dpos, cp2; 366 int error = 0, retattr; 367 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 368 u_int64_t maxfsize; 369 370 nfsstats.rpccnt[NFSPROC_FSINFO]++; 371 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 372 nfsm_fhtom(vp, 1); 373 nfsm_request(vp, NFSPROC_FSINFO, td, nfs_vpcred(vp, ND_READ)); 374 nfsm_postop_attr(vp, retattr); 375 if (!error) { 376 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 377 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 378 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 379 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 380 ~(NFS_FABLKSIZE - 1); 381 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 382 if (max < nmp->nm_wsize && max > 0) { 383 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 384 if (nmp->nm_wsize == 0) 385 nmp->nm_wsize = max; 386 } 387 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 388 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 389 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 390 ~(NFS_FABLKSIZE - 1); 391 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 392 if (max < nmp->nm_rsize && max > 0) { 393 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 394 if (nmp->nm_rsize == 0) 395 nmp->nm_rsize = max; 396 } 397 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 398 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 399 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 400 ~(NFS_DIRBLKSIZ - 1); 401 if (max < nmp->nm_readdirsize && max > 0) { 402 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 403 if (nmp->nm_readdirsize == 0) 404 nmp->nm_readdirsize = max; 405 } 406 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 407 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 408 nmp->nm_maxfilesize = maxfsize; 409 nmp->nm_state |= NFSSTA_GOTFSINFO; 410 } 411 m_freem(mrep); 412 nfsmout: 413 return (error); 414 } 415 416 /* 417 * Mount a remote root fs via. nfs. This depends on the info in the 418 * nfs_diskless structure that has been filled in properly by some primary 419 * bootstrap. 420 * It goes something like this: 421 * - do enough of "ifconfig" by calling ifioctl() so that the system 422 * can talk to the server 423 * - If nfs_diskless.mygateway is filled in, use that address as 424 * a default gateway. 425 * - build the rootfs mount point and call mountnfs() to do the rest. 426 */ 427 int 428 nfs_mountroot(mp) 429 struct mount *mp; 430 { 431 struct mount *swap_mp; 432 struct nfsv3_diskless *nd = &nfsv3_diskless; 433 struct socket *so; 434 struct vnode *vp; 435 struct thread *td = curthread; /* XXX */ 436 int error, i; 437 u_long l; 438 char buf[128]; 439 440 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 441 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 442 #endif 443 444 /* 445 * XXX time must be non-zero when we init the interface or else 446 * the arp code will wedge... 447 */ 448 while (mycpu->gd_time_seconds == 0) 449 tsleep(mycpu, 0, "arpkludge", 10); 450 451 if (nfs_diskless_valid==1) 452 nfs_convert_diskless(); 453 454 /* 455 * XXX splnet, so networks will receive... 456 */ 457 splnet(); 458 459 #ifdef notyet 460 /* Set up swap credentials. */ 461 proc0.p_ucred->cr_uid = ntohl(nd->swap_ucred.cr_uid); 462 proc0.p_ucred->cr_gid = ntohl(nd->swap_ucred.cr_gid); 463 if ((proc0.p_ucred->cr_ngroups = ntohs(nd->swap_ucred.cr_ngroups)) > 464 NGROUPS) 465 proc0.p_ucred->cr_ngroups = NGROUPS; 466 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 467 proc0.p_ucred->cr_groups[i] = ntohl(nd->swap_ucred.cr_groups[i]); 468 #endif 469 470 /* 471 * Do enough of ifconfig(8) so that the critical net interface can 472 * talk to the server. 473 */ 474 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, td); 475 if (error) 476 panic("nfs_mountroot: socreate(%04x): %d", 477 nd->myif.ifra_addr.sa_family, error); 478 479 #if 0 /* XXX Bad idea */ 480 /* 481 * We might not have been told the right interface, so we pass 482 * over the first ten interfaces of the same kind, until we get 483 * one of them configured. 484 */ 485 486 for (i = strlen(nd->myif.ifra_name) - 1; 487 nd->myif.ifra_name[i] >= '0' && 488 nd->myif.ifra_name[i] <= '9'; 489 nd->myif.ifra_name[i] ++) { 490 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td); 491 if(!error) 492 break; 493 } 494 #endif 495 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td); 496 if (error) 497 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 498 soclose(so); 499 500 /* 501 * If the gateway field is filled in, set it as the default route. 502 */ 503 if (nd->mygateway.sin_len != 0) { 504 struct sockaddr_in mask, sin; 505 506 bzero((caddr_t)&mask, sizeof(mask)); 507 sin = mask; 508 sin.sin_family = AF_INET; 509 sin.sin_len = sizeof(sin); 510 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin, 511 (struct sockaddr *)&nd->mygateway, 512 (struct sockaddr *)&mask, 513 RTF_UP | RTF_GATEWAY, (struct rtentry **)0); 514 if (error) 515 panic("nfs_mountroot: RTM_ADD: %d", error); 516 } 517 518 /* 519 * Create the rootfs mount point. 520 */ 521 nd->root_args.fh = nd->root_fh; 522 nd->root_args.fhsize = nd->root_fhsize; 523 l = ntohl(nd->root_saddr.sin_addr.s_addr); 524 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 525 (l >> 24) & 0xff, (l >> 16) & 0xff, 526 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 527 printf("NFS ROOT: %s\n",buf); 528 if ((error = nfs_mountdiskless(buf, "/", MNT_RDONLY, 529 &nd->root_saddr, &nd->root_args, td, &vp, &mp)) != 0) { 530 if (swap_mp) { 531 mp->mnt_vfc->vfc_refcount--; 532 free(swap_mp, M_MOUNT); 533 } 534 return (error); 535 } 536 537 swap_mp = NULL; 538 if (nd->swap_nblks) { 539 540 /* Convert to DEV_BSIZE instead of Kilobyte */ 541 nd->swap_nblks *= 2; 542 543 /* 544 * Create a fake mount point just for the swap vnode so that the 545 * swap file can be on a different server from the rootfs. 546 */ 547 nd->swap_args.fh = nd->swap_fh; 548 nd->swap_args.fhsize = nd->swap_fhsize; 549 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 550 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 551 (l >> 24) & 0xff, (l >> 16) & 0xff, 552 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 553 printf("NFS SWAP: %s\n",buf); 554 if ((error = nfs_mountdiskless(buf, "/swap", 0, 555 &nd->swap_saddr, &nd->swap_args, td, &vp, &swap_mp)) != 0) 556 return (error); 557 vfs_unbusy(swap_mp, td); 558 559 VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size = 560 nd->swap_nblks * DEV_BSIZE ; 561 562 /* 563 * Since the swap file is not the root dir of a file system, 564 * hack it to a regular file. 565 */ 566 vp->v_type = VREG; 567 vp->v_flag = 0; 568 vref(vp); 569 swaponvp(td, vp, nd->swap_nblks); 570 } 571 572 mp->mnt_flag |= MNT_ROOTFS; 573 mp->mnt_vnodecovered = NULLVP; 574 rootvp = vp; 575 vfs_unbusy(mp, td); 576 577 /* 578 * This is not really an nfs issue, but it is much easier to 579 * set hostname here and then let the "/etc/rc.xxx" files 580 * mount the right /var based upon its preset value. 581 */ 582 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 583 hostname[MAXHOSTNAMELEN - 1] = '\0'; 584 for (i = 0; i < MAXHOSTNAMELEN; i++) 585 if (hostname[i] == '\0') 586 break; 587 inittodr(ntohl(nd->root_time)); 588 return (0); 589 } 590 591 /* 592 * Internal version of mount system call for diskless setup. 593 */ 594 static int 595 nfs_mountdiskless(char *path, char *which, int mountflag, 596 struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, 597 struct vnode **vpp, struct mount **mpp) 598 { 599 struct mount *mp; 600 struct sockaddr *nam; 601 int error; 602 int didalloc = 0; 603 604 mp = *mpp; 605 606 if (mp == NULL) { 607 if ((error = vfs_rootmountalloc("nfs", path, &mp)) != 0) { 608 printf("nfs_mountroot: NFS not configured"); 609 return (error); 610 } 611 didalloc = 1; 612 } 613 614 mp->mnt_kern_flag = 0; 615 mp->mnt_flag = mountflag; 616 nam = dup_sockaddr((struct sockaddr *)sin, 1); 617 if ((error = mountnfs(args, mp, nam, which, path, vpp)) != 0) { 618 printf("nfs_mountroot: mount %s on %s: %d", path, which, error); 619 mp->mnt_vfc->vfc_refcount--; 620 vfs_unbusy(mp, td); 621 if (didalloc) 622 free(mp, M_MOUNT); 623 FREE(nam, M_SONAME); 624 return (error); 625 } 626 (void) copystr(which, mp->mnt_stat.f_mntonname, MNAMELEN - 1, 0); 627 *mpp = mp; 628 return (0); 629 } 630 631 static void 632 nfs_decode_args(nmp, argp) 633 struct nfsmount *nmp; 634 struct nfs_args *argp; 635 { 636 int s; 637 int adjsock; 638 int maxio; 639 640 s = splnet(); 641 /* 642 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 643 * no sense in that context. 644 */ 645 if (argp->sotype == SOCK_STREAM) 646 nmp->nm_flag &= ~NFSMNT_NOCONN; 647 648 /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */ 649 if ((argp->flags & NFSMNT_NFSV3) == 0) 650 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 651 652 /* Re-bind if rsrvd port requested and wasn't on one */ 653 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 654 && (argp->flags & NFSMNT_RESVPORT); 655 /* Also re-bind if we're switching to/from a connected UDP socket */ 656 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 657 (argp->flags & NFSMNT_NOCONN)); 658 659 /* Update flags atomically. Don't change the lock bits. */ 660 nmp->nm_flag = argp->flags | nmp->nm_flag; 661 splx(s); 662 663 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 664 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 665 if (nmp->nm_timeo < NFS_MINTIMEO) 666 nmp->nm_timeo = NFS_MINTIMEO; 667 else if (nmp->nm_timeo > NFS_MAXTIMEO) 668 nmp->nm_timeo = NFS_MAXTIMEO; 669 } 670 671 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 672 nmp->nm_retry = argp->retrans; 673 if (nmp->nm_retry > NFS_MAXREXMIT) 674 nmp->nm_retry = NFS_MAXREXMIT; 675 } 676 677 maxio = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 678 679 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 680 nmp->nm_wsize = argp->wsize; 681 /* Round down to multiple of blocksize */ 682 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 683 if (nmp->nm_wsize <= 0) 684 nmp->nm_wsize = NFS_FABLKSIZE; 685 } 686 if (nmp->nm_wsize > maxio) 687 nmp->nm_wsize = maxio; 688 if (nmp->nm_wsize > MAXBSIZE) 689 nmp->nm_wsize = MAXBSIZE; 690 691 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 692 nmp->nm_rsize = argp->rsize; 693 /* Round down to multiple of blocksize */ 694 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 695 if (nmp->nm_rsize <= 0) 696 nmp->nm_rsize = NFS_FABLKSIZE; 697 } 698 if (nmp->nm_rsize > maxio) 699 nmp->nm_rsize = maxio; 700 if (nmp->nm_rsize > MAXBSIZE) 701 nmp->nm_rsize = MAXBSIZE; 702 703 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 704 nmp->nm_readdirsize = argp->readdirsize; 705 } 706 if (nmp->nm_readdirsize > maxio) 707 nmp->nm_readdirsize = maxio; 708 if (nmp->nm_readdirsize > nmp->nm_rsize) 709 nmp->nm_readdirsize = nmp->nm_rsize; 710 711 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 712 nmp->nm_acregmin = argp->acregmin; 713 else 714 nmp->nm_acregmin = NFS_MINATTRTIMO; 715 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 716 nmp->nm_acregmax = argp->acregmax; 717 else 718 nmp->nm_acregmax = NFS_MAXATTRTIMO; 719 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 720 nmp->nm_acdirmin = argp->acdirmin; 721 else 722 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 723 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 724 nmp->nm_acdirmax = argp->acdirmax; 725 else 726 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 727 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 728 nmp->nm_acdirmin = nmp->nm_acdirmax; 729 if (nmp->nm_acregmin > nmp->nm_acregmax) 730 nmp->nm_acregmin = nmp->nm_acregmax; 731 732 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 733 if (argp->maxgrouplist <= NFS_MAXGRPS) 734 nmp->nm_numgrps = argp->maxgrouplist; 735 else 736 nmp->nm_numgrps = NFS_MAXGRPS; 737 } 738 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 739 if (argp->readahead <= NFS_MAXRAHEAD) 740 nmp->nm_readahead = argp->readahead; 741 else 742 nmp->nm_readahead = NFS_MAXRAHEAD; 743 } 744 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2) { 745 if (argp->leaseterm <= NQ_MAXLEASE) 746 nmp->nm_leaseterm = argp->leaseterm; 747 else 748 nmp->nm_leaseterm = NQ_MAXLEASE; 749 } 750 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 751 if (argp->deadthresh <= NQ_NEVERDEAD) 752 nmp->nm_deadthresh = argp->deadthresh; 753 else 754 nmp->nm_deadthresh = NQ_NEVERDEAD; 755 } 756 757 adjsock |= ((nmp->nm_sotype != argp->sotype) || 758 (nmp->nm_soproto != argp->proto)); 759 nmp->nm_sotype = argp->sotype; 760 nmp->nm_soproto = argp->proto; 761 762 if (nmp->nm_so && adjsock) { 763 nfs_safedisconnect(nmp); 764 if (nmp->nm_sotype == SOCK_DGRAM) 765 while (nfs_connect(nmp, (struct nfsreq *)0)) { 766 printf("nfs_args: retrying connect\n"); 767 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 768 } 769 } 770 } 771 772 /* 773 * VFS Operations. 774 * 775 * mount system call 776 * It seems a bit dumb to copyinstr() the host and path here and then 777 * bcopy() them in mountnfs(), but I wanted to detect errors before 778 * doing the sockargs() call because sockargs() allocates an mbuf and 779 * an error after that means that I have to release the mbuf. 780 */ 781 /* ARGSUSED */ 782 static int 783 nfs_mount(struct mount *mp, char *path, caddr_t data, 784 struct nameidata *ndp, struct thread *td) 785 { 786 int error; 787 struct nfs_args args; 788 struct sockaddr *nam; 789 struct vnode *vp; 790 char pth[MNAMELEN], hst[MNAMELEN]; 791 size_t len; 792 u_char nfh[NFSX_V3FHMAX]; 793 794 if (path == NULL) { 795 nfs_mountroot(mp); 796 return (0); 797 } 798 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 799 if (error) 800 return (error); 801 if (args.version != NFS_ARGSVERSION) { 802 #ifdef COMPAT_PRELITE2 803 /* 804 * If the argument version is unknown, then assume the 805 * caller is a pre-lite2 4.4BSD client and convert its 806 * arguments. 807 */ 808 struct onfs_args oargs; 809 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args)); 810 if (error) 811 return (error); 812 nfs_convert_oargs(&args,&oargs); 813 #else /* !COMPAT_PRELITE2 */ 814 return (EPROGMISMATCH); 815 #endif /* COMPAT_PRELITE2 */ 816 } 817 if (mp->mnt_flag & MNT_UPDATE) { 818 struct nfsmount *nmp = VFSTONFS(mp); 819 820 if (nmp == NULL) 821 return (EIO); 822 /* 823 * When doing an update, we can't change from or to 824 * v3 and/or nqnfs, or change cookie translation 825 */ 826 args.flags = (args.flags & 827 ~(NFSMNT_NFSV3|NFSMNT_NQNFS /*|NFSMNT_XLATECOOKIE*/)) | 828 (nmp->nm_flag & 829 (NFSMNT_NFSV3|NFSMNT_NQNFS /*|NFSMNT_XLATECOOKIE*/)); 830 nfs_decode_args(nmp, &args); 831 return (0); 832 } 833 834 /* 835 * Make the nfs_ip_paranoia sysctl serve as the default connection 836 * or no-connection mode for those protocols that support 837 * no-connection mode (the flag will be cleared later for protocols 838 * that do not support no-connection mode). This will allow a client 839 * to receive replies from a different IP then the request was 840 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 841 * not 0. 842 */ 843 if (nfs_ip_paranoia == 0) 844 args.flags |= NFSMNT_NOCONN; 845 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 846 return (EINVAL); 847 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 848 if (error) 849 return (error); 850 error = copyinstr(path, pth, MNAMELEN-1, &len); 851 if (error) 852 return (error); 853 bzero(&pth[len], MNAMELEN - len); 854 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 855 if (error) 856 return (error); 857 bzero(&hst[len], MNAMELEN - len); 858 /* sockargs() call must be after above copyin() calls */ 859 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 860 if (error) 861 return (error); 862 args.fh = nfh; 863 error = mountnfs(&args, mp, nam, pth, hst, &vp); 864 return (error); 865 } 866 867 /* 868 * Common code for mount and mountroot 869 */ 870 static int 871 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam, 872 char *pth, char *hst, struct vnode **vpp) 873 { 874 struct nfsmount *nmp; 875 struct nfsnode *np; 876 int error; 877 878 if (mp->mnt_flag & MNT_UPDATE) { 879 nmp = VFSTONFS(mp); 880 /* update paths, file handles, etc, here XXX */ 881 FREE(nam, M_SONAME); 882 return (0); 883 } else { 884 nmp = zalloc(nfsmount_zone); 885 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 886 TAILQ_INIT(&nmp->nm_uidlruhead); 887 TAILQ_INIT(&nmp->nm_bufq); 888 mp->mnt_data = (qaddr_t)nmp; 889 } 890 vfs_getnewfsid(mp); 891 nmp->nm_mountp = mp; 892 if (argp->flags & NFSMNT_NQNFS) 893 /* 894 * We have to set mnt_maxsymlink to a non-zero value so 895 * that COMPAT_43 routines will know that we are setting 896 * the d_type field in directories (and can zero it for 897 * unsuspecting binaries). 898 */ 899 mp->mnt_maxsymlinklen = 1; 900 901 /* 902 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 903 * high, depending on whether we end up with negative offsets in 904 * the client or server somewhere. 2GB-1 may be safer. 905 * 906 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 907 * that we can handle until we find out otherwise. 908 * XXX Our "safe" limit on the client is what we can store in our 909 * buffer cache using signed(!) block numbers. 910 */ 911 if ((argp->flags & NFSMNT_NFSV3) == 0) 912 nmp->nm_maxfilesize = 0xffffffffLL; 913 else 914 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 915 916 nmp->nm_timeo = NFS_TIMEO; 917 nmp->nm_retry = NFS_RETRANS; 918 nmp->nm_wsize = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 919 nmp->nm_rsize = nmp->nm_wsize; 920 nmp->nm_readdirsize = NFS_READDIRSIZE; 921 nmp->nm_numgrps = NFS_MAXGRPS; 922 nmp->nm_readahead = NFS_DEFRAHEAD; 923 nmp->nm_leaseterm = NQ_DEFLEASE; 924 nmp->nm_deadthresh = NQ_DEADTHRESH; 925 CIRCLEQ_INIT(&nmp->nm_timerhead); 926 nmp->nm_inprog = NULLVP; 927 nmp->nm_fhsize = argp->fhsize; 928 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 929 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 930 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 931 nmp->nm_nam = nam; 932 /* Set up the sockets and per-host congestion */ 933 nmp->nm_sotype = argp->sotype; 934 nmp->nm_soproto = argp->proto; 935 nmp->nm_cred = crhold(proc0.p_ucred); 936 937 nfs_decode_args(nmp, argp); 938 939 /* 940 * For Connection based sockets (TCP,...) defer the connect until 941 * the first request, in case the server is not responding. 942 */ 943 if (nmp->nm_sotype == SOCK_DGRAM && 944 (error = nfs_connect(nmp, (struct nfsreq *)0))) 945 goto bad; 946 947 /* 948 * This is silly, but it has to be set so that vinifod() works. 949 * We do not want to do an nfs_statfs() here since we can get 950 * stuck on a dead server and we are holding a lock on the mount 951 * point. 952 */ 953 mp->mnt_stat.f_iosize = 954 nfs_iosize(nmp->nm_flag & NFSMNT_NFSV3, nmp->nm_sotype); 955 956 /* 957 * A reference count is needed on the nfsnode representing the 958 * remote root. If this object is not persistent, then backward 959 * traversals of the mount point (i.e. "..") will not work if 960 * the nfsnode gets flushed out of the cache. Ufs does not have 961 * this problem, because one can identify root inodes by their 962 * number == ROOTINO (2). 963 */ 964 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 965 if (error) 966 goto bad; 967 *vpp = NFSTOV(np); 968 969 /* 970 * Retrieval of mountpoint attributes is delayed until nfs_rot 971 * or nfs_statfs are first called. This will happen either when 972 * we first traverse the mount point or if somebody does a df(1). 973 * 974 * NFSSTA_GOTFSINFO is used to flag if we have successfully 975 * retrieved mountpoint attributes. In the case of NFSv3 we 976 * also flag static fsinfo. 977 */ 978 if (*vpp != NULL) 979 (*vpp)->v_type = VNON; 980 981 /* 982 * Lose the lock but keep the ref. 983 */ 984 VOP_UNLOCK(*vpp, NULL, 0, curthread); 985 986 return (0); 987 bad: 988 nfs_disconnect(nmp); 989 nfs_free_mount(nmp); 990 FREE(nam, M_SONAME); 991 return (error); 992 } 993 994 /* 995 * unmount system call 996 */ 997 static int 998 nfs_unmount(struct mount *mp, int mntflags, struct thread *td) 999 { 1000 struct nfsmount *nmp; 1001 int error, flags = 0; 1002 1003 if (mntflags & MNT_FORCE) 1004 flags |= FORCECLOSE; 1005 nmp = VFSTONFS(mp); 1006 /* 1007 * Goes something like this.. 1008 * - Call vflush() to clear out vnodes for this file system 1009 * - Close the socket 1010 * - Free up the data structures 1011 */ 1012 /* In the forced case, cancel any outstanding requests. */ 1013 if (flags & FORCECLOSE) { 1014 error = nfs_nmcancelreqs(nmp); 1015 if (error) 1016 return (error); 1017 } 1018 /* 1019 * Must handshake with nqnfs_clientd() if it is active. 1020 */ 1021 nmp->nm_state |= NFSSTA_DISMINPROG; 1022 while (nmp->nm_inprog != NULLVP) 1023 (void) tsleep((caddr_t)&lbolt, 0, "nfsdism", 0); 1024 1025 /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */ 1026 error = vflush(mp, 1, flags); 1027 if (error) { 1028 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1029 return (error); 1030 } 1031 1032 /* 1033 * We are now committed to the unmount. 1034 * For NQNFS, let the server daemon free the nfsmount structure. 1035 */ 1036 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 1037 nmp->nm_state |= NFSSTA_DISMNT; 1038 1039 nfs_disconnect(nmp); 1040 FREE(nmp->nm_nam, M_SONAME); 1041 1042 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 1043 nfs_free_mount(nmp); 1044 return (0); 1045 } 1046 1047 void 1048 nfs_free_mount(struct nfsmount *nmp) 1049 { 1050 if (nmp->nm_cred) { 1051 crfree(nmp->nm_cred); 1052 nmp->nm_cred = NULL; 1053 } 1054 zfree(nfsmount_zone, nmp); 1055 } 1056 1057 /* 1058 * Return root of a filesystem 1059 */ 1060 static int 1061 nfs_root(mp, vpp) 1062 struct mount *mp; 1063 struct vnode **vpp; 1064 { 1065 struct vnode *vp; 1066 struct nfsmount *nmp; 1067 struct vattr attrs; 1068 struct nfsnode *np; 1069 int error; 1070 1071 nmp = VFSTONFS(mp); 1072 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1073 if (error) 1074 return (error); 1075 vp = NFSTOV(np); 1076 1077 /* 1078 * Get transfer parameters and root vnode attributes 1079 */ 1080 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 1081 if (nmp->nm_flag & NFSMNT_NFSV3) { 1082 nfs_fsinfo(nmp, vp, curthread); 1083 mp->mnt_stat.f_iosize = nfs_iosize(1, nmp->nm_sotype); 1084 } else { 1085 if ((error = VOP_GETATTR(vp, &attrs, curthread)) == 0) 1086 nmp->nm_state |= NFSSTA_GOTFSINFO; 1087 1088 } 1089 } 1090 if (vp->v_type == VNON) 1091 vp->v_type = VDIR; 1092 vp->v_flag = VROOT; 1093 *vpp = vp; 1094 return (0); 1095 } 1096 1097 extern int syncprt; 1098 1099 struct scaninfo { 1100 int rescan; 1101 thread_t td; 1102 int waitfor; 1103 int allerror; 1104 }; 1105 1106 static int nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data); 1107 static int nfs_sync_scan2(struct mount *mp, struct vnode *vp, lwkt_tokref_t vlock, void *data); 1108 1109 /* 1110 * Flush out the buffer cache 1111 */ 1112 /* ARGSUSED */ 1113 static int 1114 nfs_sync(struct mount *mp, int waitfor, struct thread *td) 1115 { 1116 struct scaninfo scaninfo; 1117 int error; 1118 1119 scaninfo.rescan = 0; 1120 scaninfo.td = td; 1121 scaninfo.waitfor = waitfor; 1122 scaninfo.allerror = 0; 1123 1124 /* 1125 * Force stale buffer cache information to be flushed. 1126 */ 1127 error = 0; 1128 while (error == 0 && scaninfo.rescan) { 1129 scaninfo.rescan = 0; 1130 error = vmntvnodescan(mp, nfs_sync_scan1, 1131 nfs_sync_scan2, &scaninfo); 1132 } 1133 return(error); 1134 } 1135 1136 static 1137 int 1138 nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data) 1139 { 1140 struct scaninfo *info = data; 1141 1142 if (VOP_ISLOCKED(vp, NULL) || TAILQ_EMPTY(&vp->v_dirtyblkhd)) 1143 return(-1); 1144 if (info->waitfor == MNT_LAZY) 1145 return(-1); 1146 return(0); 1147 } 1148 1149 static 1150 int 1151 nfs_sync_scan2(struct mount *mp, struct vnode *vp, lwkt_tokref_t vlock, void *data) 1152 { 1153 struct scaninfo *info = data; 1154 int error; 1155 1156 if (vget(vp, vlock, LK_EXCLUSIVE | LK_INTERLOCK, info->td)) { 1157 info->rescan = 1; 1158 return(0); 1159 } 1160 error = VOP_FSYNC(vp, info->waitfor, info->td); 1161 if (error) 1162 info->allerror = error; 1163 vput(vp); 1164 return(0); 1165 } 1166 1167