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 1.54 2008/07/31 20:23:40 swildner Exp $ 39 */ 40 41 #include "opt_bootp.h" 42 #include "opt_nfsroot.h" 43 44 #include <sys/param.h> 45 #include <sys/sockio.h> 46 #include <sys/proc.h> 47 #include <sys/vnode.h> 48 #include <sys/fcntl.h> 49 #include <sys/kernel.h> 50 #include <sys/sysctl.h> 51 #include <sys/malloc.h> 52 #include <sys/mount.h> 53 #include <sys/mbuf.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/systm.h> 57 58 #include <vm/vm.h> 59 #include <vm/vm_extern.h> 60 #include <vm/vm_zone.h> 61 62 #include <net/if.h> 63 #include <net/route.h> 64 #include <netinet/in.h> 65 66 #include <sys/thread2.h> 67 #include <sys/mutex2.h> 68 69 #include "rpcv2.h" 70 #include "nfsproto.h" 71 #include "nfs.h" 72 #include "nfsmount.h" 73 #include "nfsnode.h" 74 #include "xdr_subs.h" 75 #include "nfsm_subs.h" 76 #include "nfsdiskless.h" 77 #include "nfsmountrpc.h" 78 79 extern int nfs_mountroot(struct mount *mp); 80 extern void bootpc_init(void); 81 82 extern struct vop_ops nfsv2_vnode_vops; 83 extern struct vop_ops nfsv2_fifo_vops; 84 extern struct vop_ops nfsv2_spec_vops; 85 86 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 87 MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle"); 88 MALLOC_DEFINE(M_NFSD, "NFS daemon", "Nfs server daemon structure"); 89 MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data"); 90 MALLOC_DEFINE(M_NFSRVDESC, "NFSV3 srvdesc", "NFS server socket descriptor"); 91 MALLOC_DEFINE(M_NFSUID, "NFS uid", "Nfs uid mapping structure"); 92 MALLOC_DEFINE(M_NFSHASH, "NFS hash", "NFS hash tables"); 93 94 vm_zone_t nfsmount_zone; 95 96 struct nfsstats nfsstats; 97 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem"); 98 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RD, 99 &nfsstats, nfsstats, ""); 100 static int nfs_ip_paranoia = 1; 101 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW, 102 &nfs_ip_paranoia, 0, ""); 103 #ifdef NFS_DEBUG 104 int nfs_debug; 105 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, ""); 106 #endif 107 108 /* 109 * Tunable to determine the Read/Write unit size. Maximum value 110 * is NFS_MAXDATA. We also default to NFS_MAXDATA. 111 */ 112 static int nfs_io_size = NFS_MAXDATA; 113 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_io_size, CTLFLAG_RW, 114 &nfs_io_size, 0, "NFS optimal I/O unit size"); 115 116 static void nfs_decode_args (struct nfsmount *nmp, 117 struct nfs_args *argp); 118 static int mountnfs (struct nfs_args *,struct mount *, 119 struct sockaddr *,char *,char *,struct vnode **); 120 static int nfs_mount ( struct mount *mp, char *path, caddr_t data, 121 struct ucred *cred); 122 static int nfs_unmount ( struct mount *mp, int mntflags); 123 static int nfs_root ( struct mount *mp, struct vnode **vpp); 124 static int nfs_statfs ( struct mount *mp, struct statfs *sbp, 125 struct ucred *cred); 126 static int nfs_statvfs(struct mount *mp, struct statvfs *sbp, 127 struct ucred *cred); 128 static int nfs_sync ( struct mount *mp, int waitfor); 129 130 /* 131 * nfs vfs operations. 132 */ 133 static struct vfsops nfs_vfsops = { 134 .vfs_mount = nfs_mount, 135 .vfs_unmount = nfs_unmount, 136 .vfs_root = nfs_root, 137 .vfs_statfs = nfs_statfs, 138 .vfs_statvfs = nfs_statvfs, 139 .vfs_sync = nfs_sync, 140 .vfs_init = nfs_init, 141 .vfs_uninit = nfs_uninit 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 int 190 nfs_iosize(int v3, int sotype) 191 { 192 int iosize; 193 int iomax; 194 195 if (v3) { 196 if (sotype == SOCK_STREAM) 197 iomax = NFS_MAXDATA; 198 else 199 iomax = NFS_MAXDGRAMDATA; 200 } else { 201 iomax = NFS_V2MAXDATA; 202 } 203 if ((iosize = nfs_io_size) > iomax) 204 iosize = iomax; 205 if (iosize < PAGE_SIZE) 206 iosize = PAGE_SIZE; 207 208 /* 209 * This is an aweful hack but until the buffer cache is rewritten 210 * we need it. The problem is that when you combine write() with 211 * mmap() the vm_page->valid bits can become weird looking 212 * (e.g. 0xfc). This occurs because NFS uses piecemeal buffers 213 * at the file EOF. To solve the problem the BIO system needs to 214 * be guarenteed that the NFS iosize for regular files will be a 215 * multiple of PAGE_SIZE so it can invalidate the whole page 216 * rather then just the piece of it owned by the buffer when 217 * NFS does vinvalbuf() calls. 218 */ 219 if (iosize & PAGE_MASK) 220 iosize = (iosize & ~PAGE_MASK) + PAGE_SIZE; 221 return iosize; 222 } 223 224 static void 225 nfs_convert_oargs(struct nfs_args *args, struct onfs_args *oargs) 226 { 227 args->version = NFS_ARGSVERSION; 228 args->addr = oargs->addr; 229 args->addrlen = oargs->addrlen; 230 args->sotype = oargs->sotype; 231 args->proto = oargs->proto; 232 args->fh = oargs->fh; 233 args->fhsize = oargs->fhsize; 234 args->flags = oargs->flags; 235 args->wsize = oargs->wsize; 236 args->rsize = oargs->rsize; 237 args->readdirsize = oargs->readdirsize; 238 args->timeo = oargs->timeo; 239 args->retrans = oargs->retrans; 240 args->maxgrouplist = oargs->maxgrouplist; 241 args->readahead = oargs->readahead; 242 args->deadthresh = oargs->deadthresh; 243 args->hostname = oargs->hostname; 244 } 245 246 static void 247 nfs_convert_diskless(void) 248 { 249 int i; 250 251 bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif, 252 sizeof(struct ifaliasreq)); 253 bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway, 254 sizeof(struct sockaddr_in)); 255 nfs_convert_oargs(&nfsv3_diskless.swap_args,&nfs_diskless.swap_args); 256 257 bcopy(nfs_diskless.swap_fh,nfsv3_diskless.swap_fh,NFSX_V2FH); 258 nfsv3_diskless.swap_fhsize = NFSX_V2FH; 259 for (i = NFSX_V2FH - 1; i >= 0; --i) { 260 if (nfs_diskless.swap_fh[i]) 261 break; 262 } 263 if (i < 0) 264 nfsv3_diskless.swap_fhsize = 0; 265 266 bcopy(&nfs_diskless.swap_saddr,&nfsv3_diskless.swap_saddr, 267 sizeof(struct sockaddr_in)); 268 bcopy(nfs_diskless.swap_hostnam,nfsv3_diskless.swap_hostnam, MNAMELEN); 269 nfsv3_diskless.swap_nblks = nfs_diskless.swap_nblks; 270 bcopy(&nfs_diskless.swap_ucred, &nfsv3_diskless.swap_ucred, 271 sizeof(struct ucred)); 272 nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args); 273 274 bcopy(nfs_diskless.root_fh,nfsv3_diskless.root_fh,NFSX_V2FH); 275 nfsv3_diskless.root_fhsize = NFSX_V2FH; 276 for (i = NFSX_V2FH - 1; i >= 0; --i) { 277 if (nfs_diskless.root_fh[i]) 278 break; 279 } 280 if (i < 0) 281 nfsv3_diskless.root_fhsize = 0; 282 283 bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr, 284 sizeof(struct sockaddr_in)); 285 bcopy(nfs_diskless.root_hostnam,nfsv3_diskless.root_hostnam, MNAMELEN); 286 nfsv3_diskless.root_time = nfs_diskless.root_time; 287 bcopy(nfs_diskless.my_hostnam,nfsv3_diskless.my_hostnam, 288 MAXHOSTNAMELEN); 289 nfs_diskless_valid = 3; 290 } 291 292 /* 293 * nfs statfs call 294 */ 295 int 296 nfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 297 { 298 struct vnode *vp; 299 struct nfs_statfs *sfp; 300 struct nfsmount *nmp = VFSTONFS(mp); 301 thread_t td = curthread; 302 int error = 0, retattr; 303 struct nfsnode *np; 304 u_quad_t tquad; 305 struct nfsm_info info; 306 307 info.mrep = NULL; 308 info.v3 = (nmp->nm_flag & NFSMNT_NFSV3); 309 310 lwkt_gettoken(&nmp->nm_token); 311 312 #ifndef nolint 313 sfp = NULL; 314 #endif 315 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 316 if (error) { 317 lwkt_reltoken(&nmp->nm_token); 318 return (error); 319 } 320 vp = NFSTOV(np); 321 /* ignore the passed cred */ 322 cred = crget(); 323 cred->cr_ngroups = 1; 324 if (info.v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 325 (void)nfs_fsinfo(nmp, vp, td); 326 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 327 nfsm_reqhead(&info, vp, NFSPROC_FSSTAT, NFSX_FH(info.v3)); 328 ERROROUT(nfsm_fhtom(&info, vp)); 329 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSSTAT, td, cred, &error)); 330 if (info.v3) { 331 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, 332 NFS_LATTR_NOSHRINK)); 333 } 334 if (error) { 335 if (info.mrep != NULL) 336 m_freem(info.mrep); 337 goto nfsmout; 338 } 339 NULLOUT(sfp = nfsm_dissect(&info, NFSX_STATFS(info.v3))); 340 sbp->f_flags = nmp->nm_flag; 341 342 if (info.v3) { 343 sbp->f_bsize = NFS_FABLKSIZE; 344 tquad = fxdr_hyper(&sfp->sf_tbytes); 345 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 346 tquad = fxdr_hyper(&sfp->sf_fbytes); 347 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 348 tquad = fxdr_hyper(&sfp->sf_abytes); 349 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 350 sbp->f_files = (fxdr_unsigned(int32_t, 351 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 352 sbp->f_ffree = (fxdr_unsigned(int32_t, 353 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 354 } else { 355 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 356 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 357 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 358 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 359 sbp->f_files = 0; 360 sbp->f_ffree = 0; 361 } 362 363 /* 364 * Some values are pre-set in mnt_stat. Note in particular f_iosize 365 * cannot be changed once the filesystem is mounted as it is used 366 * as the basis for BIOs. 367 */ 368 if (sbp != &mp->mnt_stat) { 369 sbp->f_type = mp->mnt_vfc->vfc_typenum; 370 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 371 sbp->f_iosize = mp->mnt_stat.f_iosize; 372 } 373 m_freem(info.mrep); 374 info.mrep = NULL; 375 nfsmout: 376 vput(vp); 377 crfree(cred); 378 lwkt_reltoken(&nmp->nm_token); 379 return (error); 380 } 381 382 static int 383 nfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 384 { 385 struct vnode *vp; 386 struct nfs_statfs *sfp; 387 struct nfsmount *nmp = VFSTONFS(mp); 388 thread_t td = curthread; 389 int error = 0, retattr; 390 struct nfsnode *np; 391 struct nfsm_info info; 392 393 info.mrep = NULL; 394 info.v3 = (nmp->nm_flag & NFSMNT_NFSV3); 395 lwkt_gettoken(&nmp->nm_token); 396 397 #ifndef nolint 398 sfp = NULL; 399 #endif 400 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 401 if (error) { 402 lwkt_reltoken(&nmp->nm_token); 403 return (error); 404 } 405 vp = NFSTOV(np); 406 /* ignore the passed cred */ 407 cred = crget(); 408 cred->cr_ngroups = 1; 409 if (info.v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 410 (void)nfs_fsinfo(nmp, vp, td); 411 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 412 nfsm_reqhead(&info, vp, NFSPROC_FSSTAT, NFSX_FH(info.v3)); 413 ERROROUT(nfsm_fhtom(&info, vp)); 414 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSSTAT, td, cred, &error)); 415 if (info.v3) { 416 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, 417 NFS_LATTR_NOSHRINK)); 418 } 419 if (error) { 420 if (info.mrep != NULL) 421 m_freem(info.mrep); 422 goto nfsmout; 423 } 424 NULLOUT(sfp = nfsm_dissect(&info, NFSX_STATFS(info.v3))); 425 sbp->f_flag = nmp->nm_flag; 426 sbp->f_owner = nmp->nm_cred->cr_ruid; 427 428 if (info.v3) { 429 sbp->f_bsize = NFS_FABLKSIZE; 430 sbp->f_frsize = NFS_FABLKSIZE; 431 sbp->f_blocks = (fxdr_hyper(&sfp->sf_tbytes) / 432 ((u_quad_t)NFS_FABLKSIZE)); 433 sbp->f_bfree = (fxdr_hyper(&sfp->sf_fbytes) / 434 ((u_quad_t)NFS_FABLKSIZE)); 435 sbp->f_bavail = (fxdr_hyper(&sfp->sf_abytes) / 436 ((u_quad_t)NFS_FABLKSIZE)); 437 sbp->f_files = fxdr_hyper(&sfp->sf_tfiles); 438 sbp->f_ffree = fxdr_hyper(&sfp->sf_ffiles); 439 sbp->f_favail = fxdr_hyper(&sfp->sf_afiles); 440 } else { 441 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 442 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 443 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 444 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 445 sbp->f_files = 0; 446 sbp->f_ffree = 0; 447 sbp->f_favail = 0; 448 } 449 sbp->f_syncreads = 0; 450 sbp->f_syncwrites = 0; 451 sbp->f_asyncreads = 0; 452 sbp->f_asyncwrites = 0; 453 sbp->f_type = mp->mnt_vfc->vfc_typenum; 454 455 m_freem(info.mrep); 456 info.mrep = NULL; 457 nfsmout: 458 vput(vp); 459 crfree(cred); 460 lwkt_reltoken(&nmp->nm_token); 461 return (error); 462 } 463 464 /* 465 * nfs version 3 fsinfo rpc call 466 */ 467 int 468 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct thread *td) 469 { 470 struct nfsv3_fsinfo *fsp; 471 u_int32_t pref, max; 472 int error = 0, retattr; 473 u_int64_t maxfsize; 474 struct nfsm_info info; 475 476 info.v3 = 1; 477 nfsstats.rpccnt[NFSPROC_FSINFO]++; 478 nfsm_reqhead(&info, vp, NFSPROC_FSINFO, NFSX_FH(1)); 479 ERROROUT(nfsm_fhtom(&info, vp)); 480 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSINFO, td, 481 nfs_vpcred(vp, ND_READ), &error)); 482 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, NFS_LATTR_NOSHRINK)); 483 if (error == 0) { 484 NULLOUT(fsp = nfsm_dissect(&info, NFSX_V3FSINFO)); 485 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 486 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 487 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 488 ~(NFS_FABLKSIZE - 1); 489 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 490 if (max < nmp->nm_wsize && max > 0) { 491 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 492 if (nmp->nm_wsize == 0) 493 nmp->nm_wsize = max; 494 } 495 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 496 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 497 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 498 ~(NFS_FABLKSIZE - 1); 499 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 500 if (max < nmp->nm_rsize && max > 0) { 501 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 502 if (nmp->nm_rsize == 0) 503 nmp->nm_rsize = max; 504 } 505 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 506 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 507 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 508 ~(NFS_DIRBLKSIZ - 1); 509 if (max < nmp->nm_readdirsize && max > 0) { 510 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 511 if (nmp->nm_readdirsize == 0) 512 nmp->nm_readdirsize = max; 513 } 514 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 515 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 516 nmp->nm_maxfilesize = maxfsize; 517 nmp->nm_state |= NFSSTA_GOTFSINFO; 518 519 /* 520 * Use the smaller of rsize/wsize for the biosize. 521 */ 522 if (nmp->nm_rsize < nmp->nm_wsize) 523 nmp->nm_mountp->mnt_stat.f_iosize = nmp->nm_rsize; 524 else 525 nmp->nm_mountp->mnt_stat.f_iosize = nmp->nm_wsize; 526 } 527 m_freem(info.mrep); 528 info.mrep = NULL; 529 nfsmout: 530 return (error); 531 } 532 533 /* 534 * Mount a remote root fs via. nfs. This depends on the info in the 535 * nfs_diskless structure that has been filled in properly by some primary 536 * bootstrap. 537 * It goes something like this: 538 * - do enough of "ifconfig" by calling ifioctl() so that the system 539 * can talk to the server 540 * - If nfs_diskless.mygateway is filled in, use that address as 541 * a default gateway. 542 * - build the rootfs mount point and call mountnfs() to do the rest. 543 */ 544 int 545 nfs_mountroot(struct mount *mp) 546 { 547 struct mount *swap_mp; 548 struct nfsv3_diskless *nd = &nfsv3_diskless; 549 struct socket *so; 550 struct vnode *vp; 551 struct thread *td = curthread; /* XXX */ 552 int error, i; 553 u_long l; 554 char buf[128]; 555 556 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 557 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 558 #endif 559 560 /* 561 * XXX time must be non-zero when we init the interface or else 562 * the arp code will wedge... 563 */ 564 while (mycpu->gd_time_seconds == 0) 565 tsleep(mycpu, 0, "arpkludge", 10); 566 567 /* 568 * The boot code may have passed us a diskless structure. 569 */ 570 if (nfs_diskless_valid == 1) 571 nfs_convert_diskless(); 572 573 #define SINP(sockaddr) ((struct sockaddr_in *)(sockaddr)) 574 kprintf("nfs_mountroot: interface %s ip %s", 575 nd->myif.ifra_name, 576 inet_ntoa(SINP(&nd->myif.ifra_addr)->sin_addr)); 577 kprintf(" bcast %s", 578 inet_ntoa(SINP(&nd->myif.ifra_broadaddr)->sin_addr)); 579 kprintf(" mask %s\n", 580 inet_ntoa(SINP(&nd->myif.ifra_mask)->sin_addr)); 581 #undef SINP 582 583 /* 584 * XXX splnet, so networks will receive... 585 */ 586 crit_enter(); 587 588 /* 589 * BOOTP does not necessarily have to be compiled into the kernel 590 * for an NFS root to work. If we inherited the network 591 * configuration for PXEBOOT then pxe_setup_nfsdiskless() has figured 592 * out our interface for us and all we need to do is ifconfig the 593 * interface. We only do this if the interface has not already been 594 * ifconfig'd by e.g. BOOTP. 595 */ 596 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, td); 597 if (error) { 598 panic("nfs_mountroot: socreate(%04x): %d", 599 nd->myif.ifra_addr.sa_family, error); 600 } 601 602 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, proc0.p_ucred); 603 if (error) 604 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 605 606 soclose(so, FNONBLOCK); 607 608 /* 609 * If the gateway field is filled in, set it as the default route. 610 */ 611 if (nd->mygateway.sin_len != 0) { 612 struct sockaddr_in mask, sin; 613 614 bzero((caddr_t)&mask, sizeof(mask)); 615 sin = mask; 616 sin.sin_family = AF_INET; 617 sin.sin_len = sizeof(sin); 618 kprintf("nfs_mountroot: gateway %s\n", 619 inet_ntoa(nd->mygateway.sin_addr)); 620 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&sin, 621 (struct sockaddr *)&nd->mygateway, 622 (struct sockaddr *)&mask, 623 RTF_UP | RTF_GATEWAY); 624 if (error) 625 kprintf("nfs_mountroot: unable to set gateway, error %d, continuing anyway\n", error); 626 } 627 628 /* 629 * Create the rootfs mount point. 630 */ 631 nd->root_args.fh = nd->root_fh; 632 nd->root_args.fhsize = nd->root_fhsize; 633 l = ntohl(nd->root_saddr.sin_addr.s_addr); 634 ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 635 (l >> 24) & 0xff, (l >> 16) & 0xff, 636 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 637 kprintf("NFS_ROOT: %s\n",buf); 638 if ((error = nfs_mountdiskless(buf, "/", MNT_RDONLY, 639 &nd->root_saddr, &nd->root_args, td, &vp, &mp)) != 0) { 640 mp->mnt_vfc->vfc_refcount--; 641 crit_exit(); 642 return (error); 643 } 644 645 swap_mp = NULL; 646 if (nd->swap_nblks) { 647 648 /* Convert to DEV_BSIZE instead of Kilobyte */ 649 nd->swap_nblks *= 2; 650 651 /* 652 * Create a fake mount point just for the swap vnode so that the 653 * swap file can be on a different server from the rootfs. 654 */ 655 nd->swap_args.fh = nd->swap_fh; 656 nd->swap_args.fhsize = nd->swap_fhsize; 657 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 658 ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 659 (l >> 24) & 0xff, (l >> 16) & 0xff, 660 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 661 kprintf("NFS SWAP: %s\n",buf); 662 if ((error = nfs_mountdiskless(buf, "/swap", 0, 663 &nd->swap_saddr, &nd->swap_args, td, &vp, &swap_mp)) != 0) { 664 crit_exit(); 665 return (error); 666 } 667 vfs_unbusy(swap_mp); 668 669 VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size = 670 nd->swap_nblks * DEV_BSIZE ; 671 672 /* 673 * Since the swap file is not the root dir of a file system, 674 * hack it to a regular file. 675 */ 676 vclrflags(vp, VROOT); 677 vref(vp); 678 nfs_setvtype(vp, VREG); 679 swaponvp(td, vp, nd->swap_nblks); 680 } 681 682 mp->mnt_flag |= MNT_ROOTFS; 683 vfs_unbusy(mp); 684 685 /* 686 * This is not really an nfs issue, but it is much easier to 687 * set hostname here and then let the "/etc/rc.xxx" files 688 * mount the right /var based upon its preset value. 689 */ 690 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 691 hostname[MAXHOSTNAMELEN - 1] = '\0'; 692 for (i = 0; i < MAXHOSTNAMELEN; i++) 693 if (hostname[i] == '\0') 694 break; 695 inittodr(ntohl(nd->root_time)); 696 crit_exit(); 697 return (0); 698 } 699 700 /* 701 * Internal version of mount system call for diskless setup. 702 */ 703 static int 704 nfs_mountdiskless(char *path, char *which, int mountflag, 705 struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, 706 struct vnode **vpp, struct mount **mpp) 707 { 708 struct mount *mp; 709 struct sockaddr *nam; 710 int didalloc = 0; 711 int error; 712 713 mp = *mpp; 714 715 if (mp == NULL) { 716 if ((error = vfs_rootmountalloc("nfs", path, &mp)) != 0) { 717 kprintf("nfs_mountroot: NFS not configured"); 718 return (error); 719 } 720 didalloc = 1; 721 } 722 mp->mnt_kern_flag = 0; 723 mp->mnt_flag = mountflag; 724 nam = dup_sockaddr((struct sockaddr *)sin); 725 726 #if defined(BOOTP) || defined(NFS_ROOT) 727 if (args->fhsize == 0) { 728 char *xpath = path; 729 730 kprintf("NFS_ROOT: No FH passed from loader, attempting mount rpc..."); 731 while (*xpath && *xpath != ':') 732 ++xpath; 733 if (*xpath) 734 ++xpath; 735 args->fhsize = 0; 736 error = md_mount(sin, xpath, args->fh, &args->fhsize, args, td); 737 if (error) { 738 kprintf("failed error %d.\n", error); 739 goto haderror; 740 } 741 kprintf("success!\n"); 742 } 743 #endif 744 745 if ((error = mountnfs(args, mp, nam, which, path, vpp)) != 0) { 746 #if defined(BOOTP) || defined(NFS_ROOT) 747 haderror: 748 #endif 749 kprintf("nfs_mountroot: mount %s on %s: %d", path, which, error); 750 mp->mnt_vfc->vfc_refcount--; 751 vfs_unbusy(mp); 752 if (didalloc) 753 kfree(mp, M_MOUNT); 754 FREE(nam, M_SONAME); 755 return (error); 756 } 757 *mpp = mp; 758 return (0); 759 } 760 761 static void 762 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp) 763 { 764 int adjsock; 765 int maxio; 766 767 crit_enter(); 768 /* 769 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 770 * no sense in that context. 771 */ 772 if (nmp->nm_sotype == SOCK_STREAM) 773 nmp->nm_flag &= ~NFSMNT_NOCONN; 774 775 /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */ 776 if ((argp->flags & NFSMNT_NFSV3) == 0) 777 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 778 779 /* 780 * Re-bind if rsrvd port flag has changed 781 */ 782 adjsock = (nmp->nm_flag & NFSMNT_RESVPORT) != 783 (argp->flags & NFSMNT_RESVPORT); 784 785 /* Update flags atomically. Don't change the lock bits. */ 786 nmp->nm_flag = argp->flags | nmp->nm_flag; 787 crit_exit(); 788 789 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 790 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 791 if (nmp->nm_timeo < NFS_MINTIMEO) 792 nmp->nm_timeo = NFS_MINTIMEO; 793 else if (nmp->nm_timeo > NFS_MAXTIMEO) 794 nmp->nm_timeo = NFS_MAXTIMEO; 795 } 796 797 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 798 nmp->nm_retry = argp->retrans; 799 if (nmp->nm_retry > NFS_MAXREXMIT) 800 nmp->nm_retry = NFS_MAXREXMIT; 801 } 802 803 /* 804 * These parameters effect the buffer cache and cannot be changed 805 * once we've successfully mounted. 806 */ 807 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 808 maxio = nfs_iosize(argp->flags & NFSMNT_NFSV3, nmp->nm_sotype); 809 810 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 811 nmp->nm_wsize = argp->wsize; 812 /* Round down to multiple of blocksize */ 813 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 814 if (nmp->nm_wsize <= 0) 815 nmp->nm_wsize = NFS_FABLKSIZE; 816 } 817 if (nmp->nm_wsize > maxio) 818 nmp->nm_wsize = maxio; 819 if (nmp->nm_wsize > MAXBSIZE) 820 nmp->nm_wsize = MAXBSIZE; 821 822 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 823 nmp->nm_rsize = argp->rsize; 824 /* Round down to multiple of blocksize */ 825 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 826 if (nmp->nm_rsize <= 0) 827 nmp->nm_rsize = NFS_FABLKSIZE; 828 } 829 if (nmp->nm_rsize > maxio) 830 nmp->nm_rsize = maxio; 831 if (nmp->nm_rsize > MAXBSIZE) 832 nmp->nm_rsize = MAXBSIZE; 833 834 if ((argp->flags & NFSMNT_READDIRSIZE) && 835 argp->readdirsize > 0) { 836 nmp->nm_readdirsize = argp->readdirsize; 837 } 838 if (nmp->nm_readdirsize > maxio) 839 nmp->nm_readdirsize = maxio; 840 if (nmp->nm_readdirsize > nmp->nm_rsize) 841 nmp->nm_readdirsize = nmp->nm_rsize; 842 } 843 844 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 845 nmp->nm_acregmin = argp->acregmin; 846 else 847 nmp->nm_acregmin = NFS_MINATTRTIMO; 848 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 849 nmp->nm_acregmax = argp->acregmax; 850 else 851 nmp->nm_acregmax = NFS_MAXATTRTIMO; 852 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 853 nmp->nm_acdirmin = argp->acdirmin; 854 else 855 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 856 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 857 nmp->nm_acdirmax = argp->acdirmax; 858 else 859 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 860 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 861 nmp->nm_acdirmin = nmp->nm_acdirmax; 862 if (nmp->nm_acregmin > nmp->nm_acregmax) 863 nmp->nm_acregmin = nmp->nm_acregmax; 864 865 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 866 if (argp->maxgrouplist <= NFS_MAXGRPS) 867 nmp->nm_numgrps = argp->maxgrouplist; 868 else 869 nmp->nm_numgrps = NFS_MAXGRPS; 870 } 871 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 872 if (argp->readahead <= NFS_MAXRAHEAD) 873 nmp->nm_readahead = argp->readahead; 874 else 875 nmp->nm_readahead = NFS_MAXRAHEAD; 876 } 877 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 878 if (argp->deadthresh <= NFS_NEVERDEAD) 879 nmp->nm_deadthresh = argp->deadthresh; 880 else 881 nmp->nm_deadthresh = NFS_NEVERDEAD; 882 } 883 884 if (nmp->nm_so && adjsock) { 885 nfs_safedisconnect(nmp); 886 if (nmp->nm_sotype == SOCK_DGRAM) 887 while (nfs_connect(nmp, NULL)) { 888 kprintf("nfs_args: retrying connect\n"); 889 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 890 } 891 } 892 } 893 894 /* 895 * VFS Operations. 896 * 897 * mount system call 898 * It seems a bit dumb to copyinstr() the host and path here and then 899 * bcopy() them in mountnfs(), but I wanted to detect errors before 900 * doing the sockargs() call because sockargs() allocates an mbuf and 901 * an error after that means that I have to release the mbuf. 902 */ 903 /* ARGSUSED */ 904 static int 905 nfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 906 { 907 int error; 908 struct nfs_args args; 909 struct sockaddr *nam; 910 struct vnode *vp; 911 char pth[MNAMELEN], hst[MNAMELEN]; 912 size_t len; 913 u_char nfh[NFSX_V3FHMAX]; 914 915 if (path == NULL) { 916 nfs_mountroot(mp); 917 return (0); 918 } 919 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 920 if (error) 921 return (error); 922 if (args.version != NFS_ARGSVERSION) { 923 #ifdef COMPAT_PRELITE2 924 /* 925 * If the argument version is unknown, then assume the 926 * caller is a pre-lite2 4.4BSD client and convert its 927 * arguments. 928 */ 929 struct onfs_args oargs; 930 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args)); 931 if (error) 932 return (error); 933 nfs_convert_oargs(&args,&oargs); 934 #else /* !COMPAT_PRELITE2 */ 935 return (EPROGMISMATCH); 936 #endif /* COMPAT_PRELITE2 */ 937 } 938 if (mp->mnt_flag & MNT_UPDATE) { 939 struct nfsmount *nmp = VFSTONFS(mp); 940 941 if (nmp == NULL) 942 return (EIO); 943 /* 944 * When doing an update, we can't change from or to 945 * v3, or change cookie translation, or rsize or wsize. 946 */ 947 args.flags &= ~(NFSMNT_NFSV3 | NFSMNT_RSIZE | NFSMNT_WSIZE); 948 args.flags |= nmp->nm_flag & (NFSMNT_NFSV3); 949 nfs_decode_args(nmp, &args); 950 return (0); 951 } 952 953 /* 954 * Make the nfs_ip_paranoia sysctl serve as the default connection 955 * or no-connection mode for those protocols that support 956 * no-connection mode (the flag will be cleared later for protocols 957 * that do not support no-connection mode). This will allow a client 958 * to receive replies from a different IP then the request was 959 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 960 * not 0. 961 */ 962 if (nfs_ip_paranoia == 0) 963 args.flags |= NFSMNT_NOCONN; 964 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 965 return (EINVAL); 966 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 967 if (error) 968 return (error); 969 error = copyinstr(path, pth, MNAMELEN-1, &len); 970 if (error) 971 return (error); 972 bzero(&pth[len], MNAMELEN - len); 973 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 974 if (error) 975 return (error); 976 bzero(&hst[len], MNAMELEN - len); 977 /* sockargs() call must be after above copyin() calls */ 978 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 979 if (error) 980 return (error); 981 args.fh = nfh; 982 error = mountnfs(&args, mp, nam, pth, hst, &vp); 983 return (error); 984 } 985 986 /* 987 * Common code for mount and mountroot 988 */ 989 static int 990 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam, 991 char *pth, char *hst, struct vnode **vpp) 992 { 993 struct nfsmount *nmp; 994 struct nfsnode *np; 995 int error; 996 int rxcpu; 997 int txcpu; 998 999 if (mp->mnt_flag & MNT_UPDATE) { 1000 nmp = VFSTONFS(mp); 1001 /* update paths, file handles, etc, here XXX */ 1002 FREE(nam, M_SONAME); 1003 return (0); 1004 } else { 1005 nmp = zalloc(nfsmount_zone); 1006 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 1007 mtx_init(&nmp->nm_rxlock); 1008 mtx_init(&nmp->nm_txlock); 1009 TAILQ_INIT(&nmp->nm_uidlruhead); 1010 TAILQ_INIT(&nmp->nm_bioq); 1011 TAILQ_INIT(&nmp->nm_reqq); 1012 TAILQ_INIT(&nmp->nm_reqtxq); 1013 TAILQ_INIT(&nmp->nm_reqrxq); 1014 mp->mnt_data = (qaddr_t)nmp; 1015 lwkt_token_init(&nmp->nm_token, 1, "nfs_token"); 1016 } 1017 vfs_getnewfsid(mp); 1018 nmp->nm_mountp = mp; 1019 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; 1020 1021 lwkt_gettoken(&nmp->nm_token); 1022 1023 /* 1024 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 1025 * high, depending on whether we end up with negative offsets in 1026 * the client or server somewhere. 2GB-1 may be safer. 1027 * 1028 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 1029 * that we can handle until we find out otherwise. 1030 * XXX Our "safe" limit on the client is what we can store in our 1031 * buffer cache using signed(!) block numbers. 1032 */ 1033 if ((argp->flags & NFSMNT_NFSV3) == 0) 1034 nmp->nm_maxfilesize = 0xffffffffLL; 1035 else 1036 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 1037 1038 nmp->nm_timeo = NFS_TIMEO; 1039 nmp->nm_retry = NFS_RETRANS; 1040 nmp->nm_wsize = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 1041 nmp->nm_rsize = nmp->nm_wsize; 1042 nmp->nm_readdirsize = NFS_READDIRSIZE; 1043 nmp->nm_numgrps = NFS_MAXGRPS; 1044 nmp->nm_readahead = NFS_DEFRAHEAD; 1045 nmp->nm_deadthresh = NFS_DEADTHRESH; 1046 nmp->nm_fhsize = argp->fhsize; 1047 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 1048 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 1049 nmp->nm_nam = nam; 1050 /* Set up the sockets and per-host congestion */ 1051 nmp->nm_sotype = argp->sotype; 1052 nmp->nm_soproto = argp->proto; 1053 nmp->nm_cred = crhold(proc0.p_ucred); 1054 1055 nfs_decode_args(nmp, argp); 1056 1057 /* 1058 * For Connection based sockets (TCP,...) defer the connect until 1059 * the first request, in case the server is not responding. 1060 */ 1061 if (nmp->nm_sotype == SOCK_DGRAM && 1062 (error = nfs_connect(nmp, NULL))) 1063 goto bad; 1064 1065 /* 1066 * This is silly, but it has to be set so that vinifod() works. 1067 * We do not want to do an nfs_statfs() here since we can get 1068 * stuck on a dead server and we are holding a lock on the mount 1069 * point. 1070 */ 1071 mp->mnt_stat.f_iosize = 1072 nfs_iosize(nmp->nm_flag & NFSMNT_NFSV3, nmp->nm_sotype); 1073 1074 /* 1075 * Install vop_ops for our vnops 1076 */ 1077 vfs_add_vnodeops(mp, &nfsv2_vnode_vops, &mp->mnt_vn_norm_ops); 1078 vfs_add_vnodeops(mp, &nfsv2_spec_vops, &mp->mnt_vn_spec_ops); 1079 vfs_add_vnodeops(mp, &nfsv2_fifo_vops, &mp->mnt_vn_fifo_ops); 1080 1081 /* 1082 * A reference count is needed on the nfsnode representing the 1083 * remote root. If this object is not persistent, then backward 1084 * traversals of the mount point (i.e. "..") will not work if 1085 * the nfsnode gets flushed out of the cache. Ufs does not have 1086 * this problem, because one can identify root inodes by their 1087 * number == ROOTINO (2). 1088 */ 1089 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1090 if (error) 1091 goto bad; 1092 *vpp = NFSTOV(np); 1093 1094 /* 1095 * Retrieval of mountpoint attributes is delayed until nfs_rot 1096 * or nfs_statfs are first called. This will happen either when 1097 * we first traverse the mount point or if somebody does a df(1). 1098 * 1099 * NFSSTA_GOTFSINFO is used to flag if we have successfully 1100 * retrieved mountpoint attributes. In the case of NFSv3 we 1101 * also flag static fsinfo. 1102 */ 1103 if (*vpp != NULL) 1104 (*vpp)->v_type = VNON; 1105 1106 /* 1107 * Lose the lock but keep the ref. 1108 */ 1109 vn_unlock(*vpp); 1110 lwkt_gettoken(&nfs_token); 1111 TAILQ_INSERT_TAIL(&nfs_mountq, nmp, nm_entry); 1112 lwkt_reltoken(&nfs_token); 1113 1114 #ifdef SMP 1115 switch(ncpus) { 1116 case 0: 1117 case 1: 1118 rxcpu = 0; 1119 txcpu = 0; 1120 break; 1121 case 2: 1122 rxcpu = 0; 1123 txcpu = 1; 1124 break; 1125 default: 1126 rxcpu = 1; 1127 txcpu = 2; 1128 break; 1129 } 1130 #else 1131 rxcpu = 0; 1132 txcpu = 0; 1133 #endif 1134 1135 /* 1136 * Start the reader and writer threads. 1137 */ 1138 lwkt_create(nfssvc_iod_reader, nmp, &nmp->nm_rxthread, 1139 NULL, 0, rxcpu, "nfsiod_rx"); 1140 lwkt_create(nfssvc_iod_writer, nmp, &nmp->nm_txthread, 1141 NULL, 0, txcpu, "nfsiod_tx"); 1142 lwkt_reltoken(&nmp->nm_token); 1143 return (0); 1144 bad: 1145 nfs_disconnect(nmp); 1146 lwkt_reltoken(&nmp->nm_token); 1147 nfs_free_mount(nmp); 1148 return (error); 1149 } 1150 1151 /* 1152 * unmount system call 1153 */ 1154 static int 1155 nfs_unmount(struct mount *mp, int mntflags) 1156 { 1157 struct nfsmount *nmp; 1158 int error, flags = 0; 1159 1160 nmp = VFSTONFS(mp); 1161 lwkt_gettoken(&nmp->nm_token); 1162 if (mntflags & MNT_FORCE) { 1163 flags |= FORCECLOSE; 1164 nmp->nm_flag |= NFSMNT_FORCE; 1165 } 1166 1167 /* 1168 * Goes something like this.. 1169 * - Call vflush() to clear out vnodes for this file system 1170 * - Close the socket 1171 * - Free up the data structures 1172 */ 1173 /* In the forced case, cancel any outstanding requests. */ 1174 if (flags & FORCECLOSE) { 1175 error = nfs_nmcancelreqs(nmp); 1176 if (error) { 1177 kprintf("NFS: %s: Unable to cancel all requests\n", 1178 mp->mnt_stat.f_mntfromname); 1179 /* continue anyway */ 1180 } 1181 } 1182 1183 /* 1184 * Must handshake with nfs_clientd() if it is active. XXX 1185 */ 1186 nmp->nm_state |= NFSSTA_DISMINPROG; 1187 1188 /* 1189 * We hold 1 extra ref on the root vnode; see comment in mountnfs(). 1190 * 1191 * If this doesn't work and we are doing a forced unmount we continue 1192 * anyway. 1193 */ 1194 error = vflush(mp, 1, flags); 1195 if (error) { 1196 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1197 if ((flags & FORCECLOSE) == 0) { 1198 lwkt_reltoken(&nmp->nm_token); 1199 return (error); 1200 } 1201 } 1202 1203 /* 1204 * We are now committed to the unmount. 1205 * For NQNFS, let the server daemon free the nfsmount structure. 1206 */ 1207 if (nmp->nm_flag & NFSMNT_KERB) 1208 nmp->nm_state |= NFSSTA_DISMNT; 1209 nfssvc_iod_stop1(nmp); 1210 nfs_disconnect(nmp); 1211 nfssvc_iod_stop2(nmp); 1212 1213 lwkt_gettoken(&nfs_token); 1214 TAILQ_REMOVE(&nfs_mountq, nmp, nm_entry); 1215 lwkt_reltoken(&nfs_token); 1216 1217 lwkt_reltoken(&nmp->nm_token); 1218 1219 if ((nmp->nm_flag & NFSMNT_KERB) == 0) { 1220 nfs_free_mount(nmp); 1221 } 1222 return (0); 1223 } 1224 1225 void 1226 nfs_free_mount(struct nfsmount *nmp) 1227 { 1228 if (nmp->nm_cred) { 1229 crfree(nmp->nm_cred); 1230 nmp->nm_cred = NULL; 1231 } 1232 if (nmp->nm_nam) { 1233 FREE(nmp->nm_nam, M_SONAME); 1234 nmp->nm_nam = NULL; 1235 } 1236 zfree(nfsmount_zone, nmp); 1237 } 1238 1239 /* 1240 * Return root of a filesystem 1241 */ 1242 static int 1243 nfs_root(struct mount *mp, struct vnode **vpp) 1244 { 1245 struct vnode *vp; 1246 struct nfsmount *nmp; 1247 struct vattr attrs; 1248 struct nfsnode *np; 1249 int error; 1250 1251 nmp = VFSTONFS(mp); 1252 lwkt_gettoken(&nmp->nm_token); 1253 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1254 if (error) { 1255 lwkt_reltoken(&nmp->nm_token); 1256 return (error); 1257 } 1258 vp = NFSTOV(np); 1259 1260 /* 1261 * Get transfer parameters and root vnode attributes 1262 * 1263 * NOTE: nfs_fsinfo() is expected to override the default 1264 * f_iosize we set. 1265 */ 1266 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 1267 if (nmp->nm_flag & NFSMNT_NFSV3) { 1268 mp->mnt_stat.f_iosize = nfs_iosize(1, nmp->nm_sotype); 1269 error = nfs_fsinfo(nmp, vp, curthread); 1270 } else { 1271 if ((error = VOP_GETATTR(vp, &attrs)) == 0) 1272 nmp->nm_state |= NFSSTA_GOTFSINFO; 1273 1274 } 1275 } else { 1276 /* 1277 * The root vnode is usually cached by the namecache so do not 1278 * try to avoid going over the wire even if we have previous 1279 * information cached. A stale NFS mount can loop 1280 * forever resolving the root vnode if we return no-error when 1281 * there is in fact an error. 1282 */ 1283 np->n_attrstamp = 0; 1284 error = VOP_GETATTR(vp, &attrs); 1285 } 1286 if (vp->v_type == VNON) 1287 nfs_setvtype(vp, VDIR); 1288 vsetflags(vp, VROOT); 1289 if (error) 1290 vput(vp); 1291 else 1292 *vpp = vp; 1293 lwkt_reltoken(&nmp->nm_token); 1294 return (error); 1295 } 1296 1297 struct scaninfo { 1298 int rescan; 1299 int waitfor; 1300 int allerror; 1301 }; 1302 1303 static int nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data); 1304 static int nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 1305 1306 /* 1307 * Flush out the buffer cache 1308 */ 1309 /* ARGSUSED */ 1310 static int 1311 nfs_sync(struct mount *mp, int waitfor) 1312 { 1313 struct nfsmount *nmp = VFSTONFS(mp); 1314 struct scaninfo scaninfo; 1315 int error; 1316 1317 scaninfo.rescan = 1; 1318 scaninfo.waitfor = waitfor; 1319 scaninfo.allerror = 0; 1320 1321 /* 1322 * Force stale buffer cache information to be flushed. 1323 */ 1324 lwkt_gettoken(&nmp->nm_token); 1325 error = 0; 1326 while (error == 0 && scaninfo.rescan) { 1327 scaninfo.rescan = 0; 1328 error = vmntvnodescan(mp, VMSC_GETVP, nfs_sync_scan1, 1329 nfs_sync_scan2, &scaninfo); 1330 } 1331 lwkt_reltoken(&nmp->nm_token); 1332 return(error); 1333 } 1334 1335 static int 1336 nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data) 1337 { 1338 struct scaninfo *info = data; 1339 1340 if (vn_islocked(vp) || RB_EMPTY(&vp->v_rbdirty_tree)) 1341 return(-1); 1342 if (info->waitfor == MNT_LAZY) 1343 return(-1); 1344 return(0); 1345 } 1346 1347 static int 1348 nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 1349 { 1350 struct scaninfo *info = data; 1351 int error; 1352 1353 error = VOP_FSYNC(vp, info->waitfor, 0); 1354 if (error) 1355 info->allerror = error; 1356 return(0); 1357 } 1358 1359