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 1.20 2004/08/17 18:57:34 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 extern struct vnodeopv_entry_desc nfsv2_vnodeop_entries[]; 79 extern struct vnodeopv_entry_desc nfsv2_fifoop_entries[]; 80 extern struct vnodeopv_entry_desc nfsv2_specop_entries[]; 81 82 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 83 MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle"); 84 MALLOC_DEFINE(M_NFSD, "NFS daemon", "Nfs server daemon structure"); 85 MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data"); 86 MALLOC_DEFINE(M_NFSRVDESC, "NFSV3 srvdesc", "NFS server socket descriptor"); 87 MALLOC_DEFINE(M_NFSUID, "NFS uid", "Nfs uid mapping structure"); 88 MALLOC_DEFINE(M_NQLEASE, "NQNFS Lease", "Nqnfs lease"); 89 MALLOC_DEFINE(M_NFSHASH, "NFS hash", "NFS hash tables"); 90 91 vm_zone_t nfsmount_zone; 92 93 struct nfsstats nfsstats; 94 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem"); 95 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RD, 96 &nfsstats, nfsstats, ""); 97 static int nfs_ip_paranoia = 1; 98 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW, 99 &nfs_ip_paranoia, 0, ""); 100 #ifdef NFS_DEBUG 101 int nfs_debug; 102 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, ""); 103 #endif 104 105 /* 106 * Tunable to determine the Read/Write unit size. Maximum value 107 * is NFS_MAXDATA. We also default to NFS_MAXDATA. 108 */ 109 static int nfs_io_size = NFS_MAXDATA; 110 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_io_size, CTLFLAG_RW, 111 &nfs_io_size, 0, "NFS optimal I/O unit size"); 112 113 static void nfs_decode_args (struct nfsmount *nmp, 114 struct nfs_args *argp); 115 static int mountnfs (struct nfs_args *,struct mount *, 116 struct sockaddr *,char *,char *,struct vnode **); 117 static int nfs_mount ( struct mount *mp, char *path, caddr_t data, 118 struct nameidata *ndp, struct thread *td); 119 static int nfs_unmount ( struct mount *mp, int mntflags, 120 struct thread *td); 121 static int nfs_root ( struct mount *mp, struct vnode **vpp); 122 static int nfs_statfs ( struct mount *mp, struct statfs *sbp, 123 struct thread *td); 124 static int nfs_sync ( struct mount *mp, int waitfor, 125 struct thread *td); 126 127 /* 128 * nfs vfs operations. 129 */ 130 static struct vfsops nfs_vfsops = { 131 nfs_mount, 132 vfs_stdstart, 133 nfs_unmount, 134 nfs_root, 135 vfs_stdquotactl, 136 nfs_statfs, 137 nfs_sync, 138 vfs_stdvget, 139 vfs_stdfhtovp, /* shouldn't happen */ 140 vfs_stdcheckexp, 141 vfs_stdvptofh, /* shouldn't happen */ 142 nfs_init, 143 nfs_uninit, 144 vfs_stdextattrctl, 145 }; 146 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK); 147 148 /* 149 * This structure must be filled in by a primary bootstrap or bootstrap 150 * server for a diskless/dataless machine. It is initialized below just 151 * to ensure that it is allocated to initialized data (.data not .bss). 152 */ 153 struct nfs_diskless nfs_diskless = { { { 0 } } }; 154 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; 155 int nfs_diskless_valid = 0; 156 157 SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD, 158 &nfs_diskless_valid, 0, ""); 159 160 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD, 161 nfsv3_diskless.root_hostnam, 0, ""); 162 163 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD, 164 &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr, 165 "%Ssockaddr_in", ""); 166 167 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_swappath, CTLFLAG_RD, 168 nfsv3_diskless.swap_hostnam, 0, ""); 169 170 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_swapaddr, CTLFLAG_RD, 171 &nfsv3_diskless.swap_saddr, sizeof nfsv3_diskless.swap_saddr, 172 "%Ssockaddr_in",""); 173 174 175 void nfsargs_ntoh (struct nfs_args *); 176 static int nfs_mountdiskless (char *, char *, int, 177 struct sockaddr_in *, struct nfs_args *, 178 struct thread *, struct vnode **, 179 struct mount **); 180 static void nfs_convert_diskless (void); 181 static void nfs_convert_oargs (struct nfs_args *args, 182 struct onfs_args *oargs); 183 184 /* 185 * Calculate the buffer I/O block size to use. The maximum V2 block size 186 * is typically 8K, the maximum datagram size is typically 16K, and the 187 * maximum V3 block size is typically 32K. The buffer cache tends to work 188 * best with 16K blocks but we allow 32K for TCP connections. 189 * 190 * We force the block size to be at least a page for buffer cache efficiency. 191 */ 192 static 193 int 194 nfs_iosize(int v3, int sotype) 195 { 196 int iosize; 197 int iomax; 198 199 if (v3) { 200 if (sotype == SOCK_STREAM) 201 iomax = NFS_MAXDATA; 202 else 203 iomax = NFS_MAXDGRAMDATA; 204 } else { 205 iomax = NFS_V2MAXDATA; 206 } 207 if ((iosize = nfs_io_size) > iomax) 208 iosize = iomax; 209 if (iosize < PAGE_SIZE) 210 iosize = PAGE_SIZE; 211 212 /* 213 * This is an aweful hack but until the buffer cache is rewritten 214 * we need it. The problem is that when you combine write() with 215 * mmap() the vm_page->valid bits can become weird looking 216 * (e.g. 0xfc). This occurs because NFS uses piecemeal buffers 217 * at the file EOF. To solve the problem the BIO system needs to 218 * be guarenteed that the NFS iosize for regular files will be a 219 * multiple of PAGE_SIZE so it can invalidate the whole page 220 * rather then just the piece of it owned by the buffer when 221 * NFS does vinvalbuf() calls. 222 */ 223 if (iosize & PAGE_MASK) 224 iosize = (iosize & ~PAGE_MASK) + PAGE_SIZE; 225 return iosize; 226 } 227 228 static void 229 nfs_convert_oargs(args, oargs) 230 struct nfs_args *args; 231 struct onfs_args *oargs; 232 { 233 args->version = NFS_ARGSVERSION; 234 args->addr = oargs->addr; 235 args->addrlen = oargs->addrlen; 236 args->sotype = oargs->sotype; 237 args->proto = oargs->proto; 238 args->fh = oargs->fh; 239 args->fhsize = oargs->fhsize; 240 args->flags = oargs->flags; 241 args->wsize = oargs->wsize; 242 args->rsize = oargs->rsize; 243 args->readdirsize = oargs->readdirsize; 244 args->timeo = oargs->timeo; 245 args->retrans = oargs->retrans; 246 args->maxgrouplist = oargs->maxgrouplist; 247 args->readahead = oargs->readahead; 248 args->leaseterm = oargs->leaseterm; 249 args->deadthresh = oargs->deadthresh; 250 args->hostname = oargs->hostname; 251 } 252 253 static void 254 nfs_convert_diskless() 255 { 256 bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif, 257 sizeof(struct ifaliasreq)); 258 bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway, 259 sizeof(struct sockaddr_in)); 260 nfs_convert_oargs(&nfsv3_diskless.swap_args,&nfs_diskless.swap_args); 261 nfsv3_diskless.swap_fhsize = NFSX_V2FH; 262 bcopy(nfs_diskless.swap_fh,nfsv3_diskless.swap_fh,NFSX_V2FH); 263 bcopy(&nfs_diskless.swap_saddr,&nfsv3_diskless.swap_saddr, 264 sizeof(struct sockaddr_in)); 265 bcopy(nfs_diskless.swap_hostnam,nfsv3_diskless.swap_hostnam, MNAMELEN); 266 nfsv3_diskless.swap_nblks = nfs_diskless.swap_nblks; 267 bcopy(&nfs_diskless.swap_ucred, &nfsv3_diskless.swap_ucred, 268 sizeof(struct ucred)); 269 nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args); 270 nfsv3_diskless.root_fhsize = NFSX_V2FH; 271 bcopy(nfs_diskless.root_fh,nfsv3_diskless.root_fh,NFSX_V2FH); 272 bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr, 273 sizeof(struct sockaddr_in)); 274 bcopy(nfs_diskless.root_hostnam,nfsv3_diskless.root_hostnam, MNAMELEN); 275 nfsv3_diskless.root_time = nfs_diskless.root_time; 276 bcopy(nfs_diskless.my_hostnam,nfsv3_diskless.my_hostnam, 277 MAXHOSTNAMELEN); 278 nfs_diskless_valid = 3; 279 } 280 281 /* 282 * nfs statfs call 283 */ 284 int 285 nfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 286 { 287 struct vnode *vp; 288 struct nfs_statfs *sfp; 289 caddr_t cp; 290 u_int32_t *tl; 291 int32_t t1, t2; 292 caddr_t bpos, dpos, cp2; 293 struct nfsmount *nmp = VFSTONFS(mp); 294 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 295 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 296 struct ucred *cred; 297 struct nfsnode *np; 298 u_quad_t tquad; 299 300 #ifndef nolint 301 sfp = (struct nfs_statfs *)0; 302 #endif 303 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 304 if (error) 305 return (error); 306 vp = NFSTOV(np); 307 cred = crget(); 308 cred->cr_ngroups = 1; 309 if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 310 (void)nfs_fsinfo(nmp, vp, td); 311 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 312 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 313 nfsm_fhtom(vp, v3); 314 nfsm_request(vp, NFSPROC_FSSTAT, td, cred); 315 if (v3) 316 nfsm_postop_attr(vp, retattr); 317 if (error) { 318 if (mrep != NULL) 319 m_freem(mrep); 320 goto nfsmout; 321 } 322 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 323 sbp->f_flags = nmp->nm_flag; 324 sbp->f_iosize = nfs_iosize(v3, nmp->nm_sotype); 325 326 if (v3) { 327 sbp->f_bsize = NFS_FABLKSIZE; 328 tquad = fxdr_hyper(&sfp->sf_tbytes); 329 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 330 tquad = fxdr_hyper(&sfp->sf_fbytes); 331 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 332 tquad = fxdr_hyper(&sfp->sf_abytes); 333 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 334 sbp->f_files = (fxdr_unsigned(int32_t, 335 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 336 sbp->f_ffree = (fxdr_unsigned(int32_t, 337 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 338 } else { 339 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 340 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 341 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 342 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 343 sbp->f_files = 0; 344 sbp->f_ffree = 0; 345 } 346 if (sbp != &mp->mnt_stat) { 347 sbp->f_type = mp->mnt_vfc->vfc_typenum; 348 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 349 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 350 } 351 m_freem(mrep); 352 nfsmout: 353 vput(vp); 354 crfree(cred); 355 return (error); 356 } 357 358 /* 359 * nfs version 3 fsinfo rpc call 360 */ 361 int 362 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct thread *td) 363 { 364 struct nfsv3_fsinfo *fsp; 365 caddr_t cp; 366 int32_t t1, t2; 367 u_int32_t *tl, pref, max; 368 caddr_t bpos, dpos, cp2; 369 int error = 0, retattr; 370 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 371 u_int64_t maxfsize; 372 373 nfsstats.rpccnt[NFSPROC_FSINFO]++; 374 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 375 nfsm_fhtom(vp, 1); 376 nfsm_request(vp, NFSPROC_FSINFO, td, nfs_vpcred(vp, ND_READ)); 377 nfsm_postop_attr(vp, retattr); 378 if (!error) { 379 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 380 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 381 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 382 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 383 ~(NFS_FABLKSIZE - 1); 384 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 385 if (max < nmp->nm_wsize && max > 0) { 386 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 387 if (nmp->nm_wsize == 0) 388 nmp->nm_wsize = max; 389 } 390 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 391 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 392 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 393 ~(NFS_FABLKSIZE - 1); 394 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 395 if (max < nmp->nm_rsize && max > 0) { 396 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 397 if (nmp->nm_rsize == 0) 398 nmp->nm_rsize = max; 399 } 400 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 401 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 402 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 403 ~(NFS_DIRBLKSIZ - 1); 404 if (max < nmp->nm_readdirsize && max > 0) { 405 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 406 if (nmp->nm_readdirsize == 0) 407 nmp->nm_readdirsize = max; 408 } 409 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 410 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 411 nmp->nm_maxfilesize = maxfsize; 412 nmp->nm_state |= NFSSTA_GOTFSINFO; 413 } 414 m_freem(mrep); 415 nfsmout: 416 return (error); 417 } 418 419 /* 420 * Mount a remote root fs via. nfs. This depends on the info in the 421 * nfs_diskless structure that has been filled in properly by some primary 422 * bootstrap. 423 * It goes something like this: 424 * - do enough of "ifconfig" by calling ifioctl() so that the system 425 * can talk to the server 426 * - If nfs_diskless.mygateway is filled in, use that address as 427 * a default gateway. 428 * - build the rootfs mount point and call mountnfs() to do the rest. 429 */ 430 int 431 nfs_mountroot(mp) 432 struct mount *mp; 433 { 434 struct mount *swap_mp; 435 struct nfsv3_diskless *nd = &nfsv3_diskless; 436 struct socket *so; 437 struct vnode *vp; 438 struct thread *td = curthread; /* XXX */ 439 int error, i; 440 u_long l; 441 char buf[128]; 442 443 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 444 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 445 #endif 446 447 /* 448 * XXX time must be non-zero when we init the interface or else 449 * the arp code will wedge... 450 */ 451 while (mycpu->gd_time_seconds == 0) 452 tsleep(mycpu, 0, "arpkludge", 10); 453 454 if (nfs_diskless_valid==1) 455 nfs_convert_diskless(); 456 457 /* 458 * XXX splnet, so networks will receive... 459 */ 460 splnet(); 461 462 #ifdef notyet 463 /* Set up swap credentials. */ 464 proc0.p_ucred->cr_uid = ntohl(nd->swap_ucred.cr_uid); 465 proc0.p_ucred->cr_gid = ntohl(nd->swap_ucred.cr_gid); 466 if ((proc0.p_ucred->cr_ngroups = ntohs(nd->swap_ucred.cr_ngroups)) > 467 NGROUPS) 468 proc0.p_ucred->cr_ngroups = NGROUPS; 469 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 470 proc0.p_ucred->cr_groups[i] = ntohl(nd->swap_ucred.cr_groups[i]); 471 #endif 472 473 /* 474 * Do enough of ifconfig(8) so that the critical net interface can 475 * talk to the server. 476 */ 477 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, td); 478 if (error) 479 panic("nfs_mountroot: socreate(%04x): %d", 480 nd->myif.ifra_addr.sa_family, error); 481 482 #if 0 /* XXX Bad idea */ 483 /* 484 * We might not have been told the right interface, so we pass 485 * over the first ten interfaces of the same kind, until we get 486 * one of them configured. 487 */ 488 489 for (i = strlen(nd->myif.ifra_name) - 1; 490 nd->myif.ifra_name[i] >= '0' && 491 nd->myif.ifra_name[i] <= '9'; 492 nd->myif.ifra_name[i] ++) { 493 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td); 494 if(!error) 495 break; 496 } 497 #endif 498 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td); 499 if (error) 500 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 501 soclose(so); 502 503 /* 504 * If the gateway field is filled in, set it as the default route. 505 */ 506 if (nd->mygateway.sin_len != 0) { 507 struct sockaddr_in mask, sin; 508 509 bzero((caddr_t)&mask, sizeof(mask)); 510 sin = mask; 511 sin.sin_family = AF_INET; 512 sin.sin_len = sizeof(sin); 513 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin, 514 (struct sockaddr *)&nd->mygateway, 515 (struct sockaddr *)&mask, 516 RTF_UP | RTF_GATEWAY, (struct rtentry **)0); 517 if (error) 518 panic("nfs_mountroot: RTM_ADD: %d", error); 519 } 520 521 /* 522 * Create the rootfs mount point. 523 */ 524 nd->root_args.fh = nd->root_fh; 525 nd->root_args.fhsize = nd->root_fhsize; 526 l = ntohl(nd->root_saddr.sin_addr.s_addr); 527 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 528 (l >> 24) & 0xff, (l >> 16) & 0xff, 529 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 530 printf("NFS ROOT: %s\n",buf); 531 if ((error = nfs_mountdiskless(buf, "/", MNT_RDONLY, 532 &nd->root_saddr, &nd->root_args, td, &vp, &mp)) != 0) { 533 if (swap_mp) { 534 mp->mnt_vfc->vfc_refcount--; 535 free(swap_mp, M_MOUNT); 536 } 537 return (error); 538 } 539 540 swap_mp = NULL; 541 if (nd->swap_nblks) { 542 543 /* Convert to DEV_BSIZE instead of Kilobyte */ 544 nd->swap_nblks *= 2; 545 546 /* 547 * Create a fake mount point just for the swap vnode so that the 548 * swap file can be on a different server from the rootfs. 549 */ 550 nd->swap_args.fh = nd->swap_fh; 551 nd->swap_args.fhsize = nd->swap_fhsize; 552 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 553 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 554 (l >> 24) & 0xff, (l >> 16) & 0xff, 555 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 556 printf("NFS SWAP: %s\n",buf); 557 if ((error = nfs_mountdiskless(buf, "/swap", 0, 558 &nd->swap_saddr, &nd->swap_args, td, &vp, &swap_mp)) != 0) 559 return (error); 560 vfs_unbusy(swap_mp, td); 561 562 VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size = 563 nd->swap_nblks * DEV_BSIZE ; 564 565 /* 566 * Since the swap file is not the root dir of a file system, 567 * hack it to a regular file. 568 */ 569 vp->v_type = VREG; 570 vp->v_flag = 0; 571 vref(vp); 572 swaponvp(td, vp, nd->swap_nblks); 573 } 574 575 mp->mnt_flag |= MNT_ROOTFS; 576 mp->mnt_vnodecovered = NULLVP; 577 rootvp = vp; 578 vfs_unbusy(mp, td); 579 580 /* 581 * This is not really an nfs issue, but it is much easier to 582 * set hostname here and then let the "/etc/rc.xxx" files 583 * mount the right /var based upon its preset value. 584 */ 585 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 586 hostname[MAXHOSTNAMELEN - 1] = '\0'; 587 for (i = 0; i < MAXHOSTNAMELEN; i++) 588 if (hostname[i] == '\0') 589 break; 590 inittodr(ntohl(nd->root_time)); 591 return (0); 592 } 593 594 /* 595 * Internal version of mount system call for diskless setup. 596 */ 597 static int 598 nfs_mountdiskless(char *path, char *which, int mountflag, 599 struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, 600 struct vnode **vpp, struct mount **mpp) 601 { 602 struct mount *mp; 603 struct sockaddr *nam; 604 int error; 605 int didalloc = 0; 606 607 mp = *mpp; 608 609 if (mp == NULL) { 610 if ((error = vfs_rootmountalloc("nfs", path, &mp)) != 0) { 611 printf("nfs_mountroot: NFS not configured"); 612 return (error); 613 } 614 didalloc = 1; 615 } 616 617 mp->mnt_kern_flag = 0; 618 mp->mnt_flag = mountflag; 619 nam = dup_sockaddr((struct sockaddr *)sin); 620 if ((error = mountnfs(args, mp, nam, which, path, vpp)) != 0) { 621 printf("nfs_mountroot: mount %s on %s: %d", path, which, error); 622 mp->mnt_vfc->vfc_refcount--; 623 vfs_unbusy(mp, td); 624 if (didalloc) 625 free(mp, M_MOUNT); 626 FREE(nam, M_SONAME); 627 return (error); 628 } 629 (void) copystr(which, mp->mnt_stat.f_mntonname, MNAMELEN - 1, 0); 630 *mpp = mp; 631 return (0); 632 } 633 634 static void 635 nfs_decode_args(nmp, argp) 636 struct nfsmount *nmp; 637 struct nfs_args *argp; 638 { 639 int s; 640 int adjsock; 641 int maxio; 642 643 s = splnet(); 644 /* 645 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 646 * no sense in that context. 647 */ 648 if (argp->sotype == SOCK_STREAM) 649 nmp->nm_flag &= ~NFSMNT_NOCONN; 650 651 /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */ 652 if ((argp->flags & NFSMNT_NFSV3) == 0) 653 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 654 655 /* Re-bind if rsrvd port requested and wasn't on one */ 656 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 657 && (argp->flags & NFSMNT_RESVPORT); 658 /* Also re-bind if we're switching to/from a connected UDP socket */ 659 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 660 (argp->flags & NFSMNT_NOCONN)); 661 662 /* Update flags atomically. Don't change the lock bits. */ 663 nmp->nm_flag = argp->flags | nmp->nm_flag; 664 splx(s); 665 666 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 667 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 668 if (nmp->nm_timeo < NFS_MINTIMEO) 669 nmp->nm_timeo = NFS_MINTIMEO; 670 else if (nmp->nm_timeo > NFS_MAXTIMEO) 671 nmp->nm_timeo = NFS_MAXTIMEO; 672 } 673 674 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 675 nmp->nm_retry = argp->retrans; 676 if (nmp->nm_retry > NFS_MAXREXMIT) 677 nmp->nm_retry = NFS_MAXREXMIT; 678 } 679 680 maxio = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 681 682 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 683 nmp->nm_wsize = argp->wsize; 684 /* Round down to multiple of blocksize */ 685 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 686 if (nmp->nm_wsize <= 0) 687 nmp->nm_wsize = NFS_FABLKSIZE; 688 } 689 if (nmp->nm_wsize > maxio) 690 nmp->nm_wsize = maxio; 691 if (nmp->nm_wsize > MAXBSIZE) 692 nmp->nm_wsize = MAXBSIZE; 693 694 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 695 nmp->nm_rsize = argp->rsize; 696 /* Round down to multiple of blocksize */ 697 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 698 if (nmp->nm_rsize <= 0) 699 nmp->nm_rsize = NFS_FABLKSIZE; 700 } 701 if (nmp->nm_rsize > maxio) 702 nmp->nm_rsize = maxio; 703 if (nmp->nm_rsize > MAXBSIZE) 704 nmp->nm_rsize = MAXBSIZE; 705 706 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 707 nmp->nm_readdirsize = argp->readdirsize; 708 } 709 if (nmp->nm_readdirsize > maxio) 710 nmp->nm_readdirsize = maxio; 711 if (nmp->nm_readdirsize > nmp->nm_rsize) 712 nmp->nm_readdirsize = nmp->nm_rsize; 713 714 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 715 nmp->nm_acregmin = argp->acregmin; 716 else 717 nmp->nm_acregmin = NFS_MINATTRTIMO; 718 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 719 nmp->nm_acregmax = argp->acregmax; 720 else 721 nmp->nm_acregmax = NFS_MAXATTRTIMO; 722 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 723 nmp->nm_acdirmin = argp->acdirmin; 724 else 725 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 726 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 727 nmp->nm_acdirmax = argp->acdirmax; 728 else 729 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 730 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 731 nmp->nm_acdirmin = nmp->nm_acdirmax; 732 if (nmp->nm_acregmin > nmp->nm_acregmax) 733 nmp->nm_acregmin = nmp->nm_acregmax; 734 735 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 736 if (argp->maxgrouplist <= NFS_MAXGRPS) 737 nmp->nm_numgrps = argp->maxgrouplist; 738 else 739 nmp->nm_numgrps = NFS_MAXGRPS; 740 } 741 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 742 if (argp->readahead <= NFS_MAXRAHEAD) 743 nmp->nm_readahead = argp->readahead; 744 else 745 nmp->nm_readahead = NFS_MAXRAHEAD; 746 } 747 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2) { 748 if (argp->leaseterm <= NQ_MAXLEASE) 749 nmp->nm_leaseterm = argp->leaseterm; 750 else 751 nmp->nm_leaseterm = NQ_MAXLEASE; 752 } 753 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 754 if (argp->deadthresh <= NQ_NEVERDEAD) 755 nmp->nm_deadthresh = argp->deadthresh; 756 else 757 nmp->nm_deadthresh = NQ_NEVERDEAD; 758 } 759 760 adjsock |= ((nmp->nm_sotype != argp->sotype) || 761 (nmp->nm_soproto != argp->proto)); 762 nmp->nm_sotype = argp->sotype; 763 nmp->nm_soproto = argp->proto; 764 765 if (nmp->nm_so && adjsock) { 766 nfs_safedisconnect(nmp); 767 if (nmp->nm_sotype == SOCK_DGRAM) 768 while (nfs_connect(nmp, (struct nfsreq *)0)) { 769 printf("nfs_args: retrying connect\n"); 770 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 771 } 772 } 773 } 774 775 /* 776 * VFS Operations. 777 * 778 * mount system call 779 * It seems a bit dumb to copyinstr() the host and path here and then 780 * bcopy() them in mountnfs(), but I wanted to detect errors before 781 * doing the sockargs() call because sockargs() allocates an mbuf and 782 * an error after that means that I have to release the mbuf. 783 */ 784 /* ARGSUSED */ 785 static int 786 nfs_mount(struct mount *mp, char *path, caddr_t data, 787 struct nameidata *ndp, struct thread *td) 788 { 789 int error; 790 struct nfs_args args; 791 struct sockaddr *nam; 792 struct vnode *vp; 793 char pth[MNAMELEN], hst[MNAMELEN]; 794 size_t len; 795 u_char nfh[NFSX_V3FHMAX]; 796 797 if (path == NULL) { 798 nfs_mountroot(mp); 799 return (0); 800 } 801 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 802 if (error) 803 return (error); 804 if (args.version != NFS_ARGSVERSION) { 805 #ifdef COMPAT_PRELITE2 806 /* 807 * If the argument version is unknown, then assume the 808 * caller is a pre-lite2 4.4BSD client and convert its 809 * arguments. 810 */ 811 struct onfs_args oargs; 812 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args)); 813 if (error) 814 return (error); 815 nfs_convert_oargs(&args,&oargs); 816 #else /* !COMPAT_PRELITE2 */ 817 return (EPROGMISMATCH); 818 #endif /* COMPAT_PRELITE2 */ 819 } 820 if (mp->mnt_flag & MNT_UPDATE) { 821 struct nfsmount *nmp = VFSTONFS(mp); 822 823 if (nmp == NULL) 824 return (EIO); 825 /* 826 * When doing an update, we can't change from or to 827 * v3 and/or nqnfs, or change cookie translation 828 */ 829 args.flags = (args.flags & 830 ~(NFSMNT_NFSV3|NFSMNT_NQNFS /*|NFSMNT_XLATECOOKIE*/)) | 831 (nmp->nm_flag & 832 (NFSMNT_NFSV3|NFSMNT_NQNFS /*|NFSMNT_XLATECOOKIE*/)); 833 nfs_decode_args(nmp, &args); 834 return (0); 835 } 836 837 /* 838 * Make the nfs_ip_paranoia sysctl serve as the default connection 839 * or no-connection mode for those protocols that support 840 * no-connection mode (the flag will be cleared later for protocols 841 * that do not support no-connection mode). This will allow a client 842 * to receive replies from a different IP then the request was 843 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 844 * not 0. 845 */ 846 if (nfs_ip_paranoia == 0) 847 args.flags |= NFSMNT_NOCONN; 848 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 849 return (EINVAL); 850 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 851 if (error) 852 return (error); 853 error = copyinstr(path, pth, MNAMELEN-1, &len); 854 if (error) 855 return (error); 856 bzero(&pth[len], MNAMELEN - len); 857 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 858 if (error) 859 return (error); 860 bzero(&hst[len], MNAMELEN - len); 861 /* sockargs() call must be after above copyin() calls */ 862 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 863 if (error) 864 return (error); 865 args.fh = nfh; 866 error = mountnfs(&args, mp, nam, pth, hst, &vp); 867 return (error); 868 } 869 870 /* 871 * Common code for mount and mountroot 872 */ 873 static int 874 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam, 875 char *pth, char *hst, struct vnode **vpp) 876 { 877 struct nfsmount *nmp; 878 struct nfsnode *np; 879 int error; 880 881 if (mp->mnt_flag & MNT_UPDATE) { 882 nmp = VFSTONFS(mp); 883 /* update paths, file handles, etc, here XXX */ 884 FREE(nam, M_SONAME); 885 return (0); 886 } else { 887 nmp = zalloc(nfsmount_zone); 888 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 889 TAILQ_INIT(&nmp->nm_uidlruhead); 890 TAILQ_INIT(&nmp->nm_bufq); 891 mp->mnt_data = (qaddr_t)nmp; 892 } 893 vfs_getnewfsid(mp); 894 nmp->nm_mountp = mp; 895 if (argp->flags & NFSMNT_NQNFS) 896 /* 897 * We have to set mnt_maxsymlink to a non-zero value so 898 * that COMPAT_43 routines will know that we are setting 899 * the d_type field in directories (and can zero it for 900 * unsuspecting binaries). 901 */ 902 mp->mnt_maxsymlinklen = 1; 903 904 /* 905 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 906 * high, depending on whether we end up with negative offsets in 907 * the client or server somewhere. 2GB-1 may be safer. 908 * 909 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 910 * that we can handle until we find out otherwise. 911 * XXX Our "safe" limit on the client is what we can store in our 912 * buffer cache using signed(!) block numbers. 913 */ 914 if ((argp->flags & NFSMNT_NFSV3) == 0) 915 nmp->nm_maxfilesize = 0xffffffffLL; 916 else 917 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 918 919 nmp->nm_timeo = NFS_TIMEO; 920 nmp->nm_retry = NFS_RETRANS; 921 nmp->nm_wsize = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 922 nmp->nm_rsize = nmp->nm_wsize; 923 nmp->nm_readdirsize = NFS_READDIRSIZE; 924 nmp->nm_numgrps = NFS_MAXGRPS; 925 nmp->nm_readahead = NFS_DEFRAHEAD; 926 nmp->nm_leaseterm = NQ_DEFLEASE; 927 nmp->nm_deadthresh = NQ_DEADTHRESH; 928 CIRCLEQ_INIT(&nmp->nm_timerhead); 929 nmp->nm_inprog = NULLVP; 930 nmp->nm_fhsize = argp->fhsize; 931 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 932 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 933 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 934 nmp->nm_nam = nam; 935 /* Set up the sockets and per-host congestion */ 936 nmp->nm_sotype = argp->sotype; 937 nmp->nm_soproto = argp->proto; 938 nmp->nm_cred = crhold(proc0.p_ucred); 939 940 nfs_decode_args(nmp, argp); 941 942 /* 943 * For Connection based sockets (TCP,...) defer the connect until 944 * the first request, in case the server is not responding. 945 */ 946 if (nmp->nm_sotype == SOCK_DGRAM && 947 (error = nfs_connect(nmp, (struct nfsreq *)0))) 948 goto bad; 949 950 /* 951 * This is silly, but it has to be set so that vinifod() works. 952 * We do not want to do an nfs_statfs() here since we can get 953 * stuck on a dead server and we are holding a lock on the mount 954 * point. 955 */ 956 mp->mnt_stat.f_iosize = 957 nfs_iosize(nmp->nm_flag & NFSMNT_NFSV3, nmp->nm_sotype); 958 959 /* 960 * Install vop_ops for our vnops 961 */ 962 vfs_add_vnodeops(&mp->mnt_vn_ops, nfsv2_vnodeop_entries); 963 vfs_add_vnodeops(&mp->mnt_vn_spec_ops, nfsv2_specop_entries); 964 vfs_add_vnodeops(&mp->mnt_vn_fifo_ops, nfsv2_fifoop_entries); 965 966 /* 967 * A reference count is needed on the nfsnode representing the 968 * remote root. If this object is not persistent, then backward 969 * traversals of the mount point (i.e. "..") will not work if 970 * the nfsnode gets flushed out of the cache. Ufs does not have 971 * this problem, because one can identify root inodes by their 972 * number == ROOTINO (2). 973 */ 974 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 975 if (error) 976 goto bad; 977 *vpp = NFSTOV(np); 978 979 /* 980 * Retrieval of mountpoint attributes is delayed until nfs_rot 981 * or nfs_statfs are first called. This will happen either when 982 * we first traverse the mount point or if somebody does a df(1). 983 * 984 * NFSSTA_GOTFSINFO is used to flag if we have successfully 985 * retrieved mountpoint attributes. In the case of NFSv3 we 986 * also flag static fsinfo. 987 */ 988 if (*vpp != NULL) 989 (*vpp)->v_type = VNON; 990 991 /* 992 * Lose the lock but keep the ref. 993 */ 994 VOP_UNLOCK(*vpp, NULL, 0, curthread); 995 996 return (0); 997 bad: 998 nfs_disconnect(nmp); 999 nfs_free_mount(nmp); 1000 FREE(nam, M_SONAME); 1001 return (error); 1002 } 1003 1004 /* 1005 * unmount system call 1006 */ 1007 static int 1008 nfs_unmount(struct mount *mp, int mntflags, struct thread *td) 1009 { 1010 struct nfsmount *nmp; 1011 int error, flags = 0; 1012 1013 if (mntflags & MNT_FORCE) 1014 flags |= FORCECLOSE; 1015 nmp = VFSTONFS(mp); 1016 /* 1017 * Goes something like this.. 1018 * - Call vflush() to clear out vnodes for this file system 1019 * - Close the socket 1020 * - Free up the data structures 1021 */ 1022 /* In the forced case, cancel any outstanding requests. */ 1023 if (flags & FORCECLOSE) { 1024 error = nfs_nmcancelreqs(nmp); 1025 if (error) 1026 return (error); 1027 } 1028 /* 1029 * Must handshake with nqnfs_clientd() if it is active. 1030 */ 1031 nmp->nm_state |= NFSSTA_DISMINPROG; 1032 while (nmp->nm_inprog != NULLVP) 1033 (void) tsleep((caddr_t)&lbolt, 0, "nfsdism", 0); 1034 1035 /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */ 1036 error = vflush(mp, 1, flags); 1037 if (error) { 1038 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1039 return (error); 1040 } 1041 1042 /* 1043 * We are now committed to the unmount. 1044 * For NQNFS, let the server daemon free the nfsmount structure. 1045 */ 1046 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 1047 nmp->nm_state |= NFSSTA_DISMNT; 1048 1049 nfs_disconnect(nmp); 1050 FREE(nmp->nm_nam, M_SONAME); 1051 1052 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 1053 nfs_free_mount(nmp); 1054 return (0); 1055 } 1056 1057 void 1058 nfs_free_mount(struct nfsmount *nmp) 1059 { 1060 if (nmp->nm_cred) { 1061 crfree(nmp->nm_cred); 1062 nmp->nm_cred = NULL; 1063 } 1064 zfree(nfsmount_zone, nmp); 1065 } 1066 1067 /* 1068 * Return root of a filesystem 1069 */ 1070 static int 1071 nfs_root(mp, vpp) 1072 struct mount *mp; 1073 struct vnode **vpp; 1074 { 1075 struct vnode *vp; 1076 struct nfsmount *nmp; 1077 struct vattr attrs; 1078 struct nfsnode *np; 1079 int error; 1080 1081 nmp = VFSTONFS(mp); 1082 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1083 if (error) 1084 return (error); 1085 vp = NFSTOV(np); 1086 1087 /* 1088 * Get transfer parameters and root vnode attributes 1089 */ 1090 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 1091 if (nmp->nm_flag & NFSMNT_NFSV3) { 1092 nfs_fsinfo(nmp, vp, curthread); 1093 mp->mnt_stat.f_iosize = nfs_iosize(1, nmp->nm_sotype); 1094 } else { 1095 if ((error = VOP_GETATTR(vp, &attrs, curthread)) == 0) 1096 nmp->nm_state |= NFSSTA_GOTFSINFO; 1097 1098 } 1099 } 1100 if (vp->v_type == VNON) 1101 vp->v_type = VDIR; 1102 vp->v_flag = VROOT; 1103 *vpp = vp; 1104 return (0); 1105 } 1106 1107 extern int syncprt; 1108 1109 struct scaninfo { 1110 int rescan; 1111 thread_t td; 1112 int waitfor; 1113 int allerror; 1114 }; 1115 1116 static int nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data); 1117 static int nfs_sync_scan2(struct mount *mp, struct vnode *vp, lwkt_tokref_t vlock, void *data); 1118 1119 /* 1120 * Flush out the buffer cache 1121 */ 1122 /* ARGSUSED */ 1123 static int 1124 nfs_sync(struct mount *mp, int waitfor, struct thread *td) 1125 { 1126 struct scaninfo scaninfo; 1127 int error; 1128 1129 scaninfo.rescan = 0; 1130 scaninfo.td = td; 1131 scaninfo.waitfor = waitfor; 1132 scaninfo.allerror = 0; 1133 1134 /* 1135 * Force stale buffer cache information to be flushed. 1136 */ 1137 error = 0; 1138 while (error == 0 && scaninfo.rescan) { 1139 scaninfo.rescan = 0; 1140 error = vmntvnodescan(mp, nfs_sync_scan1, 1141 nfs_sync_scan2, &scaninfo); 1142 } 1143 return(error); 1144 } 1145 1146 static 1147 int 1148 nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data) 1149 { 1150 struct scaninfo *info = data; 1151 1152 if (VOP_ISLOCKED(vp, NULL) || TAILQ_EMPTY(&vp->v_dirtyblkhd)) 1153 return(-1); 1154 if (info->waitfor == MNT_LAZY) 1155 return(-1); 1156 return(0); 1157 } 1158 1159 static 1160 int 1161 nfs_sync_scan2(struct mount *mp, struct vnode *vp, lwkt_tokref_t vlock, void *data) 1162 { 1163 struct scaninfo *info = data; 1164 int error; 1165 1166 if (vget(vp, vlock, LK_EXCLUSIVE | LK_INTERLOCK, info->td)) { 1167 info->rescan = 1; 1168 return(0); 1169 } 1170 error = VOP_FSYNC(vp, info->waitfor, info->td); 1171 if (error) 1172 info->allerror = error; 1173 vput(vp); 1174 return(0); 1175 } 1176 1177