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 1.27 2005/06/06 15:09:38 drhodus 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 <sys/thread2.h> 65 66 #include "rpcv2.h" 67 #include "nfsproto.h" 68 #include "nfs.h" 69 #include "nfsmount.h" 70 #include "nfsnode.h" 71 #include "xdr_subs.h" 72 #include "nfsm_subs.h" 73 #include "nfsdiskless.h" 74 #include "nqnfs.h" 75 76 extern int nfs_mountroot(struct mount *mp); 77 extern void bootpc_init(void); 78 79 extern int nfs_ticks; 80 extern struct vnodeopv_entry_desc nfsv2_vnodeop_entries[]; 81 extern struct vnodeopv_entry_desc nfsv2_fifoop_entries[]; 82 extern struct vnodeopv_entry_desc nfsv2_specop_entries[]; 83 84 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 85 MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle"); 86 MALLOC_DEFINE(M_NFSD, "NFS daemon", "Nfs server daemon structure"); 87 MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data"); 88 MALLOC_DEFINE(M_NFSRVDESC, "NFSV3 srvdesc", "NFS server socket descriptor"); 89 MALLOC_DEFINE(M_NFSUID, "NFS uid", "Nfs uid mapping structure"); 90 MALLOC_DEFINE(M_NQLEASE, "NQNFS Lease", "Nqnfs lease"); 91 MALLOC_DEFINE(M_NFSHASH, "NFS hash", "NFS hash tables"); 92 93 vm_zone_t nfsmount_zone; 94 95 struct nfsstats nfsstats; 96 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem"); 97 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RD, 98 &nfsstats, nfsstats, ""); 99 static int nfs_ip_paranoia = 1; 100 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW, 101 &nfs_ip_paranoia, 0, ""); 102 #ifdef NFS_DEBUG 103 int nfs_debug; 104 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, ""); 105 #endif 106 107 /* 108 * Tunable to determine the Read/Write unit size. Maximum value 109 * is NFS_MAXDATA. We also default to NFS_MAXDATA. 110 */ 111 static int nfs_io_size = NFS_MAXDATA; 112 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_io_size, CTLFLAG_RW, 113 &nfs_io_size, 0, "NFS optimal I/O unit size"); 114 115 static void nfs_decode_args (struct nfsmount *nmp, 116 struct nfs_args *argp); 117 static int mountnfs (struct nfs_args *,struct mount *, 118 struct sockaddr *,char *,char *,struct vnode **); 119 static int nfs_mount ( struct mount *mp, char *path, caddr_t data, 120 struct thread *td); 121 static int nfs_unmount ( struct mount *mp, int mntflags, 122 struct thread *td); 123 static int nfs_root ( struct mount *mp, struct vnode **vpp); 124 static int nfs_statfs ( struct mount *mp, struct statfs *sbp, 125 struct thread *td); 126 static int nfs_sync ( struct mount *mp, int waitfor, 127 struct thread *td); 128 129 /* 130 * nfs vfs operations. 131 */ 132 static struct vfsops nfs_vfsops = { 133 nfs_mount, 134 vfs_stdstart, 135 nfs_unmount, 136 nfs_root, 137 vfs_stdquotactl, 138 nfs_statfs, 139 nfs_sync, 140 vfs_stdvget, 141 vfs_stdfhtovp, /* shouldn't happen */ 142 vfs_stdcheckexp, 143 vfs_stdvptofh, /* shouldn't happen */ 144 nfs_init, 145 nfs_uninit, 146 vfs_stdextattrctl, 147 }; 148 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK); 149 150 /* 151 * This structure must be filled in by a primary bootstrap or bootstrap 152 * server for a diskless/dataless machine. It is initialized below just 153 * to ensure that it is allocated to initialized data (.data not .bss). 154 */ 155 struct nfs_diskless nfs_diskless = { { { 0 } } }; 156 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; 157 int nfs_diskless_valid = 0; 158 159 SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD, 160 &nfs_diskless_valid, 0, ""); 161 162 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD, 163 nfsv3_diskless.root_hostnam, 0, ""); 164 165 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD, 166 &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr, 167 "%Ssockaddr_in", ""); 168 169 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_swappath, CTLFLAG_RD, 170 nfsv3_diskless.swap_hostnam, 0, ""); 171 172 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_swapaddr, CTLFLAG_RD, 173 &nfsv3_diskless.swap_saddr, sizeof nfsv3_diskless.swap_saddr, 174 "%Ssockaddr_in",""); 175 176 177 void nfsargs_ntoh (struct nfs_args *); 178 static int nfs_mountdiskless (char *, char *, int, 179 struct sockaddr_in *, struct nfs_args *, 180 struct thread *, struct vnode **, 181 struct mount **); 182 static void nfs_convert_diskless (void); 183 static void nfs_convert_oargs (struct nfs_args *args, 184 struct onfs_args *oargs); 185 186 /* 187 * Calculate the buffer I/O block size to use. The maximum V2 block size 188 * is typically 8K, the maximum datagram size is typically 16K, and the 189 * maximum V3 block size is typically 32K. The buffer cache tends to work 190 * best with 16K blocks but we allow 32K for TCP connections. 191 * 192 * We force the block size to be at least a page for buffer cache efficiency. 193 */ 194 static 195 int 196 nfs_iosize(int v3, int sotype) 197 { 198 int iosize; 199 int iomax; 200 201 if (v3) { 202 if (sotype == SOCK_STREAM) 203 iomax = NFS_MAXDATA; 204 else 205 iomax = NFS_MAXDGRAMDATA; 206 } else { 207 iomax = NFS_V2MAXDATA; 208 } 209 if ((iosize = nfs_io_size) > iomax) 210 iosize = iomax; 211 if (iosize < PAGE_SIZE) 212 iosize = PAGE_SIZE; 213 214 /* 215 * This is an aweful hack but until the buffer cache is rewritten 216 * we need it. The problem is that when you combine write() with 217 * mmap() the vm_page->valid bits can become weird looking 218 * (e.g. 0xfc). This occurs because NFS uses piecemeal buffers 219 * at the file EOF. To solve the problem the BIO system needs to 220 * be guarenteed that the NFS iosize for regular files will be a 221 * multiple of PAGE_SIZE so it can invalidate the whole page 222 * rather then just the piece of it owned by the buffer when 223 * NFS does vinvalbuf() calls. 224 */ 225 if (iosize & PAGE_MASK) 226 iosize = (iosize & ~PAGE_MASK) + PAGE_SIZE; 227 return iosize; 228 } 229 230 static void 231 nfs_convert_oargs(args, oargs) 232 struct nfs_args *args; 233 struct onfs_args *oargs; 234 { 235 args->version = NFS_ARGSVERSION; 236 args->addr = oargs->addr; 237 args->addrlen = oargs->addrlen; 238 args->sotype = oargs->sotype; 239 args->proto = oargs->proto; 240 args->fh = oargs->fh; 241 args->fhsize = oargs->fhsize; 242 args->flags = oargs->flags; 243 args->wsize = oargs->wsize; 244 args->rsize = oargs->rsize; 245 args->readdirsize = oargs->readdirsize; 246 args->timeo = oargs->timeo; 247 args->retrans = oargs->retrans; 248 args->maxgrouplist = oargs->maxgrouplist; 249 args->readahead = oargs->readahead; 250 args->leaseterm = oargs->leaseterm; 251 args->deadthresh = oargs->deadthresh; 252 args->hostname = oargs->hostname; 253 } 254 255 static void 256 nfs_convert_diskless() 257 { 258 bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif, 259 sizeof(struct ifaliasreq)); 260 bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway, 261 sizeof(struct sockaddr_in)); 262 nfs_convert_oargs(&nfsv3_diskless.swap_args,&nfs_diskless.swap_args); 263 nfsv3_diskless.swap_fhsize = NFSX_V2FH; 264 bcopy(nfs_diskless.swap_fh,nfsv3_diskless.swap_fh,NFSX_V2FH); 265 bcopy(&nfs_diskless.swap_saddr,&nfsv3_diskless.swap_saddr, 266 sizeof(struct sockaddr_in)); 267 bcopy(nfs_diskless.swap_hostnam,nfsv3_diskless.swap_hostnam, MNAMELEN); 268 nfsv3_diskless.swap_nblks = nfs_diskless.swap_nblks; 269 bcopy(&nfs_diskless.swap_ucred, &nfsv3_diskless.swap_ucred, 270 sizeof(struct ucred)); 271 nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args); 272 nfsv3_diskless.root_fhsize = NFSX_V2FH; 273 bcopy(nfs_diskless.root_fh,nfsv3_diskless.root_fh,NFSX_V2FH); 274 bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr, 275 sizeof(struct sockaddr_in)); 276 bcopy(nfs_diskless.root_hostnam,nfsv3_diskless.root_hostnam, MNAMELEN); 277 nfsv3_diskless.root_time = nfs_diskless.root_time; 278 bcopy(nfs_diskless.my_hostnam,nfsv3_diskless.my_hostnam, 279 MAXHOSTNAMELEN); 280 nfs_diskless_valid = 3; 281 } 282 283 /* 284 * nfs statfs call 285 */ 286 int 287 nfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 288 { 289 struct vnode *vp; 290 struct nfs_statfs *sfp; 291 caddr_t cp; 292 u_int32_t *tl; 293 int32_t t1, t2; 294 caddr_t bpos, dpos, cp2; 295 struct nfsmount *nmp = VFSTONFS(mp); 296 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 297 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 298 struct ucred *cred; 299 struct nfsnode *np; 300 u_quad_t tquad; 301 302 #ifndef nolint 303 sfp = (struct nfs_statfs *)0; 304 #endif 305 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 306 if (error) 307 return (error); 308 vp = NFSTOV(np); 309 cred = crget(); 310 cred->cr_ngroups = 1; 311 if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 312 (void)nfs_fsinfo(nmp, vp, td); 313 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 314 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 315 nfsm_fhtom(vp, v3); 316 nfsm_request(vp, NFSPROC_FSSTAT, td, cred); 317 if (v3) 318 nfsm_postop_attr(vp, retattr, NFS_LATTR_NOSHRINK); 319 if (error) { 320 if (mrep != NULL) 321 m_freem(mrep); 322 goto nfsmout; 323 } 324 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 325 sbp->f_flags = nmp->nm_flag; 326 sbp->f_iosize = nfs_iosize(v3, nmp->nm_sotype); 327 328 if (v3) { 329 sbp->f_bsize = NFS_FABLKSIZE; 330 tquad = fxdr_hyper(&sfp->sf_tbytes); 331 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 332 tquad = fxdr_hyper(&sfp->sf_fbytes); 333 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 334 tquad = fxdr_hyper(&sfp->sf_abytes); 335 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 336 sbp->f_files = (fxdr_unsigned(int32_t, 337 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 338 sbp->f_ffree = (fxdr_unsigned(int32_t, 339 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 340 } else { 341 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 342 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 343 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 344 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 345 sbp->f_files = 0; 346 sbp->f_ffree = 0; 347 } 348 if (sbp != &mp->mnt_stat) { 349 sbp->f_type = mp->mnt_vfc->vfc_typenum; 350 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 351 } 352 m_freem(mrep); 353 nfsmout: 354 vput(vp); 355 crfree(cred); 356 return (error); 357 } 358 359 /* 360 * nfs version 3 fsinfo rpc call 361 */ 362 int 363 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct thread *td) 364 { 365 struct nfsv3_fsinfo *fsp; 366 caddr_t cp; 367 int32_t t1, t2; 368 u_int32_t *tl, pref, max; 369 caddr_t bpos, dpos, cp2; 370 int error = 0, retattr; 371 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 372 u_int64_t maxfsize; 373 374 nfsstats.rpccnt[NFSPROC_FSINFO]++; 375 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 376 nfsm_fhtom(vp, 1); 377 nfsm_request(vp, NFSPROC_FSINFO, td, nfs_vpcred(vp, ND_READ)); 378 nfsm_postop_attr(vp, retattr, NFS_LATTR_NOSHRINK); 379 if (!error) { 380 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 381 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 382 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 383 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 384 ~(NFS_FABLKSIZE - 1); 385 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 386 if (max < nmp->nm_wsize && max > 0) { 387 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 388 if (nmp->nm_wsize == 0) 389 nmp->nm_wsize = max; 390 } 391 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 392 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 393 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 394 ~(NFS_FABLKSIZE - 1); 395 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 396 if (max < nmp->nm_rsize && max > 0) { 397 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 398 if (nmp->nm_rsize == 0) 399 nmp->nm_rsize = max; 400 } 401 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 402 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 403 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 404 ~(NFS_DIRBLKSIZ - 1); 405 if (max < nmp->nm_readdirsize && max > 0) { 406 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 407 if (nmp->nm_readdirsize == 0) 408 nmp->nm_readdirsize = max; 409 } 410 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 411 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 412 nmp->nm_maxfilesize = maxfsize; 413 nmp->nm_state |= NFSSTA_GOTFSINFO; 414 } 415 m_freem(mrep); 416 nfsmout: 417 return (error); 418 } 419 420 /* 421 * Mount a remote root fs via. nfs. This depends on the info in the 422 * nfs_diskless structure that has been filled in properly by some primary 423 * bootstrap. 424 * It goes something like this: 425 * - do enough of "ifconfig" by calling ifioctl() so that the system 426 * can talk to the server 427 * - If nfs_diskless.mygateway is filled in, use that address as 428 * a default gateway. 429 * - build the rootfs mount point and call mountnfs() to do the rest. 430 */ 431 int 432 nfs_mountroot(mp) 433 struct mount *mp; 434 { 435 struct mount *swap_mp; 436 struct nfsv3_diskless *nd = &nfsv3_diskless; 437 struct socket *so; 438 struct vnode *vp; 439 struct thread *td = curthread; /* XXX */ 440 int error, i; 441 u_long l; 442 char buf[128]; 443 444 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 445 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 446 #endif 447 448 /* 449 * XXX time must be non-zero when we init the interface or else 450 * the arp code will wedge... 451 */ 452 while (mycpu->gd_time_seconds == 0) 453 tsleep(mycpu, 0, "arpkludge", 10); 454 455 if (nfs_diskless_valid==1) 456 nfs_convert_diskless(); 457 458 /* 459 * XXX splnet, so networks will receive... 460 */ 461 crit_enter(); 462 463 #ifdef notyet 464 /* Set up swap credentials. */ 465 proc0.p_ucred->cr_uid = ntohl(nd->swap_ucred.cr_uid); 466 proc0.p_ucred->cr_gid = ntohl(nd->swap_ucred.cr_gid); 467 if ((proc0.p_ucred->cr_ngroups = ntohs(nd->swap_ucred.cr_ngroups)) > 468 NGROUPS) 469 proc0.p_ucred->cr_ngroups = NGROUPS; 470 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 471 proc0.p_ucred->cr_groups[i] = ntohl(nd->swap_ucred.cr_groups[i]); 472 #endif 473 474 /* 475 * Do enough of ifconfig(8) so that the critical net interface can 476 * talk to the server. 477 */ 478 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, td); 479 if (error) 480 panic("nfs_mountroot: socreate(%04x): %d", 481 nd->myif.ifra_addr.sa_family, error); 482 483 #if 0 /* XXX Bad idea */ 484 /* 485 * We might not have been told the right interface, so we pass 486 * over the first ten interfaces of the same kind, until we get 487 * one of them configured. 488 */ 489 490 for (i = strlen(nd->myif.ifra_name) - 1; 491 nd->myif.ifra_name[i] >= '0' && 492 nd->myif.ifra_name[i] <= '9'; 493 nd->myif.ifra_name[i] ++) { 494 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td); 495 if(!error) 496 break; 497 } 498 #endif 499 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td); 500 if (error) 501 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 502 soclose(so); 503 504 /* 505 * If the gateway field is filled in, set it as the default route. 506 */ 507 if (nd->mygateway.sin_len != 0) { 508 struct sockaddr_in mask, sin; 509 510 bzero((caddr_t)&mask, sizeof(mask)); 511 sin = mask; 512 sin.sin_family = AF_INET; 513 sin.sin_len = sizeof(sin); 514 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin, 515 (struct sockaddr *)&nd->mygateway, 516 (struct sockaddr *)&mask, 517 RTF_UP | RTF_GATEWAY, (struct rtentry **)0); 518 if (error) 519 panic("nfs_mountroot: RTM_ADD: %d", error); 520 } 521 522 /* 523 * Create the rootfs mount point. 524 */ 525 nd->root_args.fh = nd->root_fh; 526 nd->root_args.fhsize = nd->root_fhsize; 527 l = ntohl(nd->root_saddr.sin_addr.s_addr); 528 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 529 (l >> 24) & 0xff, (l >> 16) & 0xff, 530 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 531 printf("NFS ROOT: %s\n",buf); 532 if ((error = nfs_mountdiskless(buf, "/", MNT_RDONLY, 533 &nd->root_saddr, &nd->root_args, td, &vp, &mp)) != 0) { 534 if (swap_mp) { 535 mp->mnt_vfc->vfc_refcount--; 536 free(swap_mp, M_MOUNT); 537 } 538 return (error); 539 } 540 541 swap_mp = NULL; 542 if (nd->swap_nblks) { 543 544 /* Convert to DEV_BSIZE instead of Kilobyte */ 545 nd->swap_nblks *= 2; 546 547 /* 548 * Create a fake mount point just for the swap vnode so that the 549 * swap file can be on a different server from the rootfs. 550 */ 551 nd->swap_args.fh = nd->swap_fh; 552 nd->swap_args.fhsize = nd->swap_fhsize; 553 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 554 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 555 (l >> 24) & 0xff, (l >> 16) & 0xff, 556 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 557 printf("NFS SWAP: %s\n",buf); 558 if ((error = nfs_mountdiskless(buf, "/swap", 0, 559 &nd->swap_saddr, &nd->swap_args, td, &vp, &swap_mp)) != 0) 560 return (error); 561 vfs_unbusy(swap_mp, td); 562 563 VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size = 564 nd->swap_nblks * DEV_BSIZE ; 565 566 /* 567 * Since the swap file is not the root dir of a file system, 568 * hack it to a regular file. 569 */ 570 vp->v_type = VREG; 571 vp->v_flag = 0; 572 vref(vp); 573 swaponvp(td, vp, nd->swap_nblks); 574 } 575 576 mp->mnt_flag |= MNT_ROOTFS; 577 mp->mnt_vnodecovered = NULLVP; 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 *mpp = mp; 630 return (0); 631 } 632 633 static void 634 nfs_decode_args(nmp, argp) 635 struct nfsmount *nmp; 636 struct nfs_args *argp; 637 { 638 int adjsock; 639 int maxio; 640 641 crit_enter(); 642 /* 643 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 644 * no sense in that context. 645 */ 646 if (argp->sotype == SOCK_STREAM) 647 nmp->nm_flag &= ~NFSMNT_NOCONN; 648 649 /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */ 650 if ((argp->flags & NFSMNT_NFSV3) == 0) 651 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 652 653 /* Re-bind if rsrvd port requested and wasn't on one */ 654 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 655 && (argp->flags & NFSMNT_RESVPORT); 656 /* Also re-bind if we're switching to/from a connected UDP socket */ 657 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 658 (argp->flags & NFSMNT_NOCONN)); 659 660 /* Update flags atomically. Don't change the lock bits. */ 661 nmp->nm_flag = argp->flags | nmp->nm_flag; 662 crit_exit(); 663 664 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 665 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 666 if (nmp->nm_timeo < NFS_MINTIMEO) 667 nmp->nm_timeo = NFS_MINTIMEO; 668 else if (nmp->nm_timeo > NFS_MAXTIMEO) 669 nmp->nm_timeo = NFS_MAXTIMEO; 670 } 671 672 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 673 nmp->nm_retry = argp->retrans; 674 if (nmp->nm_retry > NFS_MAXREXMIT) 675 nmp->nm_retry = NFS_MAXREXMIT; 676 } 677 678 maxio = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 679 680 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 681 nmp->nm_wsize = argp->wsize; 682 /* Round down to multiple of blocksize */ 683 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 684 if (nmp->nm_wsize <= 0) 685 nmp->nm_wsize = NFS_FABLKSIZE; 686 } 687 if (nmp->nm_wsize > maxio) 688 nmp->nm_wsize = maxio; 689 if (nmp->nm_wsize > MAXBSIZE) 690 nmp->nm_wsize = MAXBSIZE; 691 692 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 693 nmp->nm_rsize = argp->rsize; 694 /* Round down to multiple of blocksize */ 695 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 696 if (nmp->nm_rsize <= 0) 697 nmp->nm_rsize = NFS_FABLKSIZE; 698 } 699 if (nmp->nm_rsize > maxio) 700 nmp->nm_rsize = maxio; 701 if (nmp->nm_rsize > MAXBSIZE) 702 nmp->nm_rsize = MAXBSIZE; 703 704 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 705 nmp->nm_readdirsize = argp->readdirsize; 706 } 707 if (nmp->nm_readdirsize > maxio) 708 nmp->nm_readdirsize = maxio; 709 if (nmp->nm_readdirsize > nmp->nm_rsize) 710 nmp->nm_readdirsize = nmp->nm_rsize; 711 712 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 713 nmp->nm_acregmin = argp->acregmin; 714 else 715 nmp->nm_acregmin = NFS_MINATTRTIMO; 716 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 717 nmp->nm_acregmax = argp->acregmax; 718 else 719 nmp->nm_acregmax = NFS_MAXATTRTIMO; 720 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 721 nmp->nm_acdirmin = argp->acdirmin; 722 else 723 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 724 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 725 nmp->nm_acdirmax = argp->acdirmax; 726 else 727 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 728 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 729 nmp->nm_acdirmin = nmp->nm_acdirmax; 730 if (nmp->nm_acregmin > nmp->nm_acregmax) 731 nmp->nm_acregmin = nmp->nm_acregmax; 732 733 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 734 if (argp->maxgrouplist <= NFS_MAXGRPS) 735 nmp->nm_numgrps = argp->maxgrouplist; 736 else 737 nmp->nm_numgrps = NFS_MAXGRPS; 738 } 739 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 740 if (argp->readahead <= NFS_MAXRAHEAD) 741 nmp->nm_readahead = argp->readahead; 742 else 743 nmp->nm_readahead = NFS_MAXRAHEAD; 744 } 745 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2) { 746 if (argp->leaseterm <= NQ_MAXLEASE) 747 nmp->nm_leaseterm = argp->leaseterm; 748 else 749 nmp->nm_leaseterm = NQ_MAXLEASE; 750 } 751 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 752 if (argp->deadthresh <= NQ_NEVERDEAD) 753 nmp->nm_deadthresh = argp->deadthresh; 754 else 755 nmp->nm_deadthresh = NQ_NEVERDEAD; 756 } 757 758 adjsock |= ((nmp->nm_sotype != argp->sotype) || 759 (nmp->nm_soproto != argp->proto)); 760 nmp->nm_sotype = argp->sotype; 761 nmp->nm_soproto = argp->proto; 762 763 if (nmp->nm_so && adjsock) { 764 nfs_safedisconnect(nmp); 765 if (nmp->nm_sotype == SOCK_DGRAM) 766 while (nfs_connect(nmp, (struct nfsreq *)0)) { 767 printf("nfs_args: retrying connect\n"); 768 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 769 } 770 } 771 } 772 773 /* 774 * VFS Operations. 775 * 776 * mount system call 777 * It seems a bit dumb to copyinstr() the host and path here and then 778 * bcopy() them in mountnfs(), but I wanted to detect errors before 779 * doing the sockargs() call because sockargs() allocates an mbuf and 780 * an error after that means that I have to release the mbuf. 781 */ 782 /* ARGSUSED */ 783 static int 784 nfs_mount(struct mount *mp, char *path, caddr_t data, 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 nmp->nm_nam = nam; 931 /* Set up the sockets and per-host congestion */ 932 nmp->nm_sotype = argp->sotype; 933 nmp->nm_soproto = argp->proto; 934 nmp->nm_cred = crhold(proc0.p_ucred); 935 936 nfs_decode_args(nmp, argp); 937 938 /* 939 * For Connection based sockets (TCP,...) defer the connect until 940 * the first request, in case the server is not responding. 941 */ 942 if (nmp->nm_sotype == SOCK_DGRAM && 943 (error = nfs_connect(nmp, (struct nfsreq *)0))) 944 goto bad; 945 946 /* 947 * This is silly, but it has to be set so that vinifod() works. 948 * We do not want to do an nfs_statfs() here since we can get 949 * stuck on a dead server and we are holding a lock on the mount 950 * point. 951 */ 952 mp->mnt_stat.f_iosize = 953 nfs_iosize(nmp->nm_flag & NFSMNT_NFSV3, nmp->nm_sotype); 954 955 /* 956 * Install vop_ops for our vnops 957 */ 958 vfs_add_vnodeops(mp, &mp->mnt_vn_norm_ops, nfsv2_vnodeop_entries); 959 vfs_add_vnodeops(mp, &mp->mnt_vn_spec_ops, nfsv2_specop_entries); 960 vfs_add_vnodeops(mp, &mp->mnt_vn_fifo_ops, nfsv2_fifoop_entries); 961 962 /* 963 * A reference count is needed on the nfsnode representing the 964 * remote root. If this object is not persistent, then backward 965 * traversals of the mount point (i.e. "..") will not work if 966 * the nfsnode gets flushed out of the cache. Ufs does not have 967 * this problem, because one can identify root inodes by their 968 * number == ROOTINO (2). 969 */ 970 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 971 if (error) 972 goto bad; 973 *vpp = NFSTOV(np); 974 975 /* 976 * Retrieval of mountpoint attributes is delayed until nfs_rot 977 * or nfs_statfs are first called. This will happen either when 978 * we first traverse the mount point or if somebody does a df(1). 979 * 980 * NFSSTA_GOTFSINFO is used to flag if we have successfully 981 * retrieved mountpoint attributes. In the case of NFSv3 we 982 * also flag static fsinfo. 983 */ 984 if (*vpp != NULL) 985 (*vpp)->v_type = VNON; 986 987 /* 988 * Lose the lock but keep the ref. 989 */ 990 VOP_UNLOCK(*vpp, 0, curthread); 991 992 return (0); 993 bad: 994 nfs_disconnect(nmp); 995 nfs_free_mount(nmp); 996 FREE(nam, M_SONAME); 997 return (error); 998 } 999 1000 /* 1001 * unmount system call 1002 */ 1003 static int 1004 nfs_unmount(struct mount *mp, int mntflags, struct thread *td) 1005 { 1006 struct nfsmount *nmp; 1007 int error, flags = 0; 1008 1009 if (mntflags & MNT_FORCE) 1010 flags |= FORCECLOSE; 1011 nmp = VFSTONFS(mp); 1012 /* 1013 * Goes something like this.. 1014 * - Call vflush() to clear out vnodes for this file system 1015 * - Close the socket 1016 * - Free up the data structures 1017 */ 1018 /* In the forced case, cancel any outstanding requests. */ 1019 if (flags & FORCECLOSE) { 1020 error = nfs_nmcancelreqs(nmp); 1021 if (error) 1022 return (error); 1023 } 1024 /* 1025 * Must handshake with nqnfs_clientd() if it is active. 1026 */ 1027 nmp->nm_state |= NFSSTA_DISMINPROG; 1028 while (nmp->nm_inprog != NULLVP) 1029 (void) tsleep((caddr_t)&lbolt, 0, "nfsdism", 0); 1030 1031 /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */ 1032 error = vflush(mp, 1, flags); 1033 if (error) { 1034 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1035 return (error); 1036 } 1037 1038 /* 1039 * We are now committed to the unmount. 1040 * For NQNFS, let the server daemon free the nfsmount structure. 1041 */ 1042 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 1043 nmp->nm_state |= NFSSTA_DISMNT; 1044 1045 nfs_disconnect(nmp); 1046 FREE(nmp->nm_nam, M_SONAME); 1047 1048 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 1049 nfs_free_mount(nmp); 1050 return (0); 1051 } 1052 1053 void 1054 nfs_free_mount(struct nfsmount *nmp) 1055 { 1056 if (nmp->nm_cred) { 1057 crfree(nmp->nm_cred); 1058 nmp->nm_cred = NULL; 1059 } 1060 zfree(nfsmount_zone, nmp); 1061 } 1062 1063 /* 1064 * Return root of a filesystem 1065 */ 1066 static int 1067 nfs_root(mp, vpp) 1068 struct mount *mp; 1069 struct vnode **vpp; 1070 { 1071 struct vnode *vp; 1072 struct nfsmount *nmp; 1073 struct vattr attrs; 1074 struct nfsnode *np; 1075 int error; 1076 1077 nmp = VFSTONFS(mp); 1078 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1079 if (error) 1080 return (error); 1081 vp = NFSTOV(np); 1082 1083 /* 1084 * Get transfer parameters and root vnode attributes 1085 */ 1086 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 1087 if (nmp->nm_flag & NFSMNT_NFSV3) { 1088 nfs_fsinfo(nmp, vp, curthread); 1089 mp->mnt_stat.f_iosize = nfs_iosize(1, nmp->nm_sotype); 1090 } else { 1091 if ((error = VOP_GETATTR(vp, &attrs, curthread)) == 0) 1092 nmp->nm_state |= NFSSTA_GOTFSINFO; 1093 1094 } 1095 } 1096 if (vp->v_type == VNON) 1097 vp->v_type = VDIR; 1098 vp->v_flag = VROOT; 1099 *vpp = vp; 1100 return (0); 1101 } 1102 1103 extern int syncprt; 1104 1105 struct scaninfo { 1106 int rescan; 1107 thread_t td; 1108 int waitfor; 1109 int allerror; 1110 }; 1111 1112 static int nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data); 1113 static int nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 1114 1115 /* 1116 * Flush out the buffer cache 1117 */ 1118 /* ARGSUSED */ 1119 static int 1120 nfs_sync(struct mount *mp, int waitfor, struct thread *td) 1121 { 1122 struct scaninfo scaninfo; 1123 int error; 1124 1125 scaninfo.rescan = 0; 1126 scaninfo.td = td; 1127 scaninfo.waitfor = waitfor; 1128 scaninfo.allerror = 0; 1129 1130 /* 1131 * Force stale buffer cache information to be flushed. 1132 */ 1133 error = 0; 1134 while (error == 0 && scaninfo.rescan) { 1135 scaninfo.rescan = 0; 1136 error = vmntvnodescan(mp, VMSC_GETVP, nfs_sync_scan1, 1137 nfs_sync_scan2, &scaninfo); 1138 } 1139 return(error); 1140 } 1141 1142 static 1143 int 1144 nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data) 1145 { 1146 struct scaninfo *info = data; 1147 1148 if (VOP_ISLOCKED(vp, NULL) || RB_EMPTY(&vp->v_rbdirty_tree)) 1149 return(-1); 1150 if (info->waitfor == MNT_LAZY) 1151 return(-1); 1152 return(0); 1153 } 1154 1155 static 1156 int 1157 nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 1158 { 1159 struct scaninfo *info = data; 1160 int error; 1161 1162 error = VOP_FSYNC(vp, info->waitfor, info->td); 1163 if (error) 1164 info->allerror = error; 1165 return(0); 1166 } 1167 1168