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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 33 * $FreeBSD: src/sys/nfs/nfs_vfsops.c,v 1.91.2.7 2003/01/27 20:04:08 dillon Exp $ 34 */ 35 36 #include "opt_bootp.h" 37 #include "opt_nfsroot.h" 38 39 #include <sys/param.h> 40 #include <sys/sockio.h> 41 #include <sys/proc.h> 42 #include <sys/vnode.h> 43 #include <sys/fcntl.h> 44 #include <sys/kernel.h> 45 #include <sys/sysctl.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/mbuf.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/systm.h> 52 #include <sys/objcache.h> 53 54 #include <vm/vm.h> 55 #include <vm/vm_extern.h> 56 57 #include <net/if.h> 58 #include <net/route.h> 59 #include <netinet/in.h> 60 61 #include <sys/thread2.h> 62 #include <sys/mutex2.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 "nfsmountrpc.h" 73 74 extern int nfs_mountroot(struct mount *mp); 75 extern void bootpc_init(void); 76 77 extern struct vop_ops nfsv2_vnode_vops; 78 extern struct vop_ops nfsv2_fifo_vops; 79 extern struct vop_ops nfsv2_spec_vops; 80 81 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 82 MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle"); 83 MALLOC_DEFINE(M_NFSD, "NFS daemon", "Nfs server daemon structure"); 84 MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data"); 85 MALLOC_DEFINE(M_NFSRVDESC, "NFSV3 srvdesc", "NFS server socket descriptor"); 86 MALLOC_DEFINE(M_NFSUID, "NFS uid", "Nfs uid mapping structure"); 87 MALLOC_DEFINE(M_NFSHASH, "NFS hash", "NFS hash tables"); 88 89 struct objcache *nfsmount_objcache; 90 91 struct nfsstats nfsstats; 92 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem"); 93 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RD, &nfsstats, nfsstats, 94 "Nfs stats structure"); 95 static int nfs_ip_paranoia = 1; 96 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW, &nfs_ip_paranoia, 0, 97 "Enable no-connection mode for protocols that support no-connection mode"); 98 #ifdef NFS_DEBUG 99 int nfs_debug; 100 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, ""); 101 #endif 102 103 /* 104 * Tunable to determine the Read/Write unit size. Maximum value 105 * is NFS_MAXDATA. We also default to NFS_MAXDATA. 106 */ 107 static int nfs_io_size = NFS_MAXDATA; 108 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_io_size, CTLFLAG_RW, 109 &nfs_io_size, 0, "NFS optimal I/O unit size"); 110 111 static void nfs_decode_args (struct nfsmount *nmp, 112 struct nfs_args *argp); 113 static int mountnfs (struct nfs_args *,struct mount *, 114 struct sockaddr *,char *,char *,struct vnode **); 115 static int nfs_mount ( struct mount *mp, char *path, caddr_t data, 116 struct ucred *cred); 117 static int nfs_unmount ( struct mount *mp, int mntflags); 118 static int nfs_root ( struct mount *mp, struct vnode **vpp); 119 static int nfs_statfs ( struct mount *mp, struct statfs *sbp, 120 struct ucred *cred); 121 static int nfs_statvfs(struct mount *mp, struct statvfs *sbp, 122 struct ucred *cred); 123 static int nfs_sync ( struct mount *mp, int waitfor); 124 125 /* 126 * nfs vfs operations. 127 */ 128 static struct vfsops nfs_vfsops = { 129 .vfs_mount = nfs_mount, 130 .vfs_unmount = nfs_unmount, 131 .vfs_root = nfs_root, 132 .vfs_statfs = nfs_statfs, 133 .vfs_statvfs = nfs_statvfs, 134 .vfs_sync = nfs_sync, 135 .vfs_init = nfs_init, 136 .vfs_uninit = nfs_uninit 137 }; 138 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK); 139 MODULE_VERSION(nfs, 1); 140 141 /* 142 * This structure must be filled in by a primary bootstrap or bootstrap 143 * server for a diskless/dataless machine. It is initialized below just 144 * to ensure that it is allocated to initialized data (.data not .bss). 145 */ 146 struct nfs_diskless nfs_diskless = { { { 0 } } }; 147 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; 148 int nfs_diskless_valid = 0; 149 150 SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD, 151 &nfs_diskless_valid, 0, 152 "NFS diskless params were obtained"); 153 154 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD, 155 nfsv3_diskless.root_hostnam, 0, 156 "Host name for mount point"); 157 158 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD, 159 &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr, 160 "%Ssockaddr_in", "Address of root server"); 161 162 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_swappath, CTLFLAG_RD, 163 nfsv3_diskless.swap_hostnam, 0, 164 "Host name for mount ppoint"); 165 166 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_swapaddr, CTLFLAG_RD, 167 &nfsv3_diskless.swap_saddr, sizeof nfsv3_diskless.swap_saddr, 168 "%Ssockaddr_in", "Address of swap server"); 169 170 171 void nfsargs_ntoh (struct nfs_args *); 172 static int nfs_mountdiskless (char *, char *, int, 173 struct sockaddr_in *, struct nfs_args *, 174 struct thread *, struct vnode **, 175 struct mount **); 176 static void nfs_convert_diskless (void); 177 static void nfs_convert_oargs (struct nfs_args *args, 178 struct onfs_args *oargs); 179 180 /* 181 * Calculate the buffer I/O block size to use. The maximum V2 block size 182 * is typically 8K, the maximum datagram size is typically 16K, and the 183 * maximum V3 block size is typically 32K. The buffer cache tends to work 184 * best with 16K blocks but we allow 32K for TCP connections. 185 * 186 * We force the block size to be at least a page for buffer cache efficiency. 187 */ 188 static int 189 nfs_iosize(int v3, int sotype) 190 { 191 int iosize; 192 int iomax; 193 194 if (v3) { 195 if (sotype == SOCK_STREAM) 196 iomax = NFS_MAXDATA; 197 else 198 iomax = NFS_MAXDGRAMDATA; 199 } else { 200 iomax = NFS_V2MAXDATA; 201 } 202 if ((iosize = nfs_io_size) > iomax) 203 iosize = iomax; 204 if (iosize < PAGE_SIZE) 205 iosize = PAGE_SIZE; 206 207 /* 208 * This is an aweful hack but until the buffer cache is rewritten 209 * we need it. The problem is that when you combine write() with 210 * mmap() the vm_page->valid bits can become weird looking 211 * (e.g. 0xfc). This occurs because NFS uses piecemeal buffers 212 * at the file EOF. To solve the problem the BIO system needs to 213 * be guarenteed that the NFS iosize for regular files will be a 214 * multiple of PAGE_SIZE so it can invalidate the whole page 215 * rather then just the piece of it owned by the buffer when 216 * NFS does vinvalbuf() calls. 217 */ 218 if (iosize & PAGE_MASK) 219 iosize = (iosize & ~PAGE_MASK) + PAGE_SIZE; 220 return iosize; 221 } 222 223 static void 224 nfs_convert_oargs(struct nfs_args *args, struct onfs_args *oargs) 225 { 226 args->version = NFS_ARGSVERSION; 227 args->addr = oargs->addr; 228 args->addrlen = oargs->addrlen; 229 args->sotype = oargs->sotype; 230 args->proto = oargs->proto; 231 args->fh = oargs->fh; 232 args->fhsize = oargs->fhsize; 233 args->flags = oargs->flags; 234 args->wsize = oargs->wsize; 235 args->rsize = oargs->rsize; 236 args->readdirsize = oargs->readdirsize; 237 args->timeo = oargs->timeo; 238 args->retrans = oargs->retrans; 239 args->maxgrouplist = oargs->maxgrouplist; 240 args->readahead = oargs->readahead; 241 args->deadthresh = oargs->deadthresh; 242 args->hostname = oargs->hostname; 243 } 244 245 static void 246 nfs_convert_diskless(void) 247 { 248 int i; 249 250 bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif, 251 sizeof(struct ifaliasreq)); 252 bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway, 253 sizeof(struct sockaddr_in)); 254 nfs_convert_oargs(&nfsv3_diskless.swap_args, &nfs_diskless.swap_args); 255 256 /* 257 * Copy the NFS handle passed from the diskless code. 258 * 259 * XXX CURRENTLY DISABLED - bootp passes us a NFSv2 handle which 260 * will fail utterly with HAMMER due to limitations with NFSv2 261 * directory cookies. 262 */ 263 bcopy(nfs_diskless.swap_fh, nfsv3_diskless.swap_fh, NFSX_V2FH); 264 nfsv3_diskless.swap_fhsize = NFSX_V2FH; 265 for (i = NFSX_V2FH - 1; i >= 0; --i) { 266 if (nfs_diskless.swap_fh[i]) 267 break; 268 } 269 if (i < 0) 270 nfsv3_diskless.swap_fhsize = 0; 271 nfsv3_diskless.swap_fhsize = 0; /* FORCE DISABLE */ 272 273 bcopy(&nfs_diskless.swap_saddr,&nfsv3_diskless.swap_saddr, 274 sizeof(struct sockaddr_in)); 275 bcopy(nfs_diskless.swap_hostnam,nfsv3_diskless.swap_hostnam, MNAMELEN); 276 nfsv3_diskless.swap_nblks = nfs_diskless.swap_nblks; 277 bcopy(&nfs_diskless.swap_ucred, &nfsv3_diskless.swap_ucred, 278 sizeof(struct ucred)); 279 nfs_convert_oargs(&nfsv3_diskless.root_args, &nfs_diskless.root_args); 280 281 /* 282 * Copy the NFS handle passed from the diskless code. 283 * 284 * XXX CURRENTLY DISABLED - bootp passes us a NFSv2 handle which 285 * will fail utterly with HAMMER due to limitations with NFSv2 286 * directory cookies. 287 */ 288 bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V2FH); 289 nfsv3_diskless.root_fhsize = NFSX_V2FH; 290 for (i = NFSX_V2FH - 1; i >= 0; --i) { 291 if (nfs_diskless.root_fh[i]) 292 break; 293 } 294 if (i < 0) 295 nfsv3_diskless.root_fhsize = 0; 296 nfsv3_diskless.root_fhsize = 0; /* FORCE DISABLE */ 297 298 bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr, 299 sizeof(struct sockaddr_in)); 300 bcopy(nfs_diskless.root_hostnam,nfsv3_diskless.root_hostnam, MNAMELEN); 301 nfsv3_diskless.root_time = nfs_diskless.root_time; 302 bcopy(nfs_diskless.my_hostnam,nfsv3_diskless.my_hostnam, 303 MAXHOSTNAMELEN); 304 nfs_diskless_valid = 3; 305 } 306 307 /* 308 * nfs statfs call 309 */ 310 int 311 nfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 312 { 313 struct vnode *vp; 314 struct nfs_statfs *sfp; 315 struct nfsmount *nmp = VFSTONFS(mp); 316 thread_t td = curthread; 317 int error = 0, retattr; 318 struct nfsnode *np; 319 u_quad_t tquad; 320 struct nfsm_info info; 321 322 info.mrep = NULL; 323 info.v3 = (nmp->nm_flag & NFSMNT_NFSV3); 324 325 lwkt_gettoken(&nmp->nm_token); 326 327 #ifndef nolint 328 sfp = NULL; 329 #endif 330 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, NULL); 331 if (error) { 332 lwkt_reltoken(&nmp->nm_token); 333 return (error); 334 } 335 vp = NFSTOV(np); 336 /* ignore the passed cred */ 337 cred = crget(); 338 cred->cr_ngroups = 1; 339 if (info.v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 340 (void)nfs_fsinfo(nmp, vp, td); 341 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 342 nfsm_reqhead(&info, vp, NFSPROC_FSSTAT, NFSX_FH(info.v3)); 343 ERROROUT(nfsm_fhtom(&info, vp)); 344 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSSTAT, td, cred, &error)); 345 if (info.v3) { 346 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, 347 NFS_LATTR_NOSHRINK)); 348 } 349 if (error) { 350 if (info.mrep != NULL) 351 m_freem(info.mrep); 352 goto nfsmout; 353 } 354 NULLOUT(sfp = nfsm_dissect(&info, NFSX_STATFS(info.v3))); 355 sbp->f_flags = nmp->nm_flag; 356 357 if (info.v3) { 358 sbp->f_bsize = NFS_FABLKSIZE; 359 tquad = fxdr_hyper(&sfp->sf_tbytes); 360 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 361 tquad = fxdr_hyper(&sfp->sf_fbytes); 362 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 363 tquad = fxdr_hyper(&sfp->sf_abytes); 364 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 365 sbp->f_files = (fxdr_unsigned(int32_t, 366 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 367 sbp->f_ffree = (fxdr_unsigned(int32_t, 368 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 369 } else { 370 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 371 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 372 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 373 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 374 sbp->f_files = 0; 375 sbp->f_ffree = 0; 376 } 377 378 /* 379 * Some values are pre-set in mnt_stat. Note in particular f_iosize 380 * cannot be changed once the filesystem is mounted as it is used 381 * as the basis for BIOs. 382 */ 383 if (sbp != &mp->mnt_stat) { 384 sbp->f_type = mp->mnt_vfc->vfc_typenum; 385 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 386 sbp->f_iosize = mp->mnt_stat.f_iosize; 387 } 388 m_freem(info.mrep); 389 info.mrep = NULL; 390 nfsmout: 391 vput(vp); 392 crfree(cred); 393 lwkt_reltoken(&nmp->nm_token); 394 return (error); 395 } 396 397 static int 398 nfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 399 { 400 struct vnode *vp; 401 struct nfs_statfs *sfp; 402 struct nfsmount *nmp = VFSTONFS(mp); 403 thread_t td = curthread; 404 int error = 0, retattr; 405 struct nfsnode *np; 406 struct nfsm_info info; 407 408 info.mrep = NULL; 409 info.v3 = (nmp->nm_flag & NFSMNT_NFSV3); 410 lwkt_gettoken(&nmp->nm_token); 411 412 #ifndef nolint 413 sfp = NULL; 414 #endif 415 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, NULL); 416 if (error) { 417 lwkt_reltoken(&nmp->nm_token); 418 return (error); 419 } 420 vp = NFSTOV(np); 421 /* ignore the passed cred */ 422 cred = crget(); 423 cred->cr_ngroups = 1; 424 if (info.v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 425 (void)nfs_fsinfo(nmp, vp, td); 426 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 427 nfsm_reqhead(&info, vp, NFSPROC_FSSTAT, NFSX_FH(info.v3)); 428 ERROROUT(nfsm_fhtom(&info, vp)); 429 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSSTAT, td, cred, &error)); 430 if (info.v3) { 431 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, 432 NFS_LATTR_NOSHRINK)); 433 } 434 if (error) { 435 if (info.mrep != NULL) 436 m_freem(info.mrep); 437 goto nfsmout; 438 } 439 NULLOUT(sfp = nfsm_dissect(&info, NFSX_STATFS(info.v3))); 440 sbp->f_flag = nmp->nm_flag; 441 sbp->f_owner = nmp->nm_cred->cr_ruid; 442 443 if (info.v3) { 444 sbp->f_bsize = NFS_FABLKSIZE; 445 sbp->f_frsize = NFS_FABLKSIZE; 446 sbp->f_blocks = (fxdr_hyper(&sfp->sf_tbytes) / 447 ((u_quad_t)NFS_FABLKSIZE)); 448 sbp->f_bfree = (fxdr_hyper(&sfp->sf_fbytes) / 449 ((u_quad_t)NFS_FABLKSIZE)); 450 sbp->f_bavail = (fxdr_hyper(&sfp->sf_abytes) / 451 ((u_quad_t)NFS_FABLKSIZE)); 452 sbp->f_files = fxdr_hyper(&sfp->sf_tfiles); 453 sbp->f_ffree = fxdr_hyper(&sfp->sf_ffiles); 454 sbp->f_favail = fxdr_hyper(&sfp->sf_afiles); 455 } else { 456 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 457 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 458 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 459 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 460 sbp->f_files = 0; 461 sbp->f_ffree = 0; 462 sbp->f_favail = 0; 463 } 464 sbp->f_syncreads = 0; 465 sbp->f_syncwrites = 0; 466 sbp->f_asyncreads = 0; 467 sbp->f_asyncwrites = 0; 468 sbp->f_type = mp->mnt_vfc->vfc_typenum; 469 470 m_freem(info.mrep); 471 info.mrep = NULL; 472 nfsmout: 473 vput(vp); 474 crfree(cred); 475 lwkt_reltoken(&nmp->nm_token); 476 return (error); 477 } 478 479 /* 480 * nfs version 3 fsinfo rpc call 481 */ 482 int 483 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct thread *td) 484 { 485 struct nfsv3_fsinfo *fsp; 486 u_int32_t pref, max; 487 int error = 0, retattr; 488 u_int64_t maxfsize; 489 struct nfsm_info info; 490 491 info.v3 = 1; 492 nfsstats.rpccnt[NFSPROC_FSINFO]++; 493 nfsm_reqhead(&info, vp, NFSPROC_FSINFO, NFSX_FH(1)); 494 ERROROUT(nfsm_fhtom(&info, vp)); 495 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSINFO, td, 496 nfs_vpcred(vp, ND_READ), &error)); 497 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, NFS_LATTR_NOSHRINK)); 498 if (error == 0) { 499 NULLOUT(fsp = nfsm_dissect(&info, NFSX_V3FSINFO)); 500 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 501 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 502 nmp->nm_wsize = roundup2(pref, NFS_FABLKSIZE); 503 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 504 if (max < nmp->nm_wsize && max > 0) { 505 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 506 if (nmp->nm_wsize == 0) 507 nmp->nm_wsize = max; 508 } 509 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 510 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 511 nmp->nm_rsize = roundup2(pref, NFS_FABLKSIZE); 512 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 513 if (max < nmp->nm_rsize && max > 0) { 514 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 515 if (nmp->nm_rsize == 0) 516 nmp->nm_rsize = max; 517 } 518 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 519 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 520 nmp->nm_readdirsize = roundup2(pref, NFS_DIRBLKSIZ); 521 if (max < nmp->nm_readdirsize && max > 0) { 522 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 523 if (nmp->nm_readdirsize == 0) 524 nmp->nm_readdirsize = max; 525 } 526 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 527 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 528 nmp->nm_maxfilesize = maxfsize; 529 nmp->nm_state |= NFSSTA_GOTFSINFO; 530 531 /* 532 * Use the smaller of rsize/wsize for the biosize. 533 */ 534 if (nmp->nm_rsize < nmp->nm_wsize) 535 nmp->nm_mountp->mnt_stat.f_iosize = nmp->nm_rsize; 536 else 537 nmp->nm_mountp->mnt_stat.f_iosize = nmp->nm_wsize; 538 } 539 m_freem(info.mrep); 540 info.mrep = NULL; 541 nfsmout: 542 return (error); 543 } 544 545 /* 546 * Mount a remote root fs via. nfs. This depends on the info in the 547 * nfs_diskless structure that has been filled in properly by some primary 548 * bootstrap. 549 * It goes something like this: 550 * - do enough of "ifconfig" by calling ifioctl() so that the system 551 * can talk to the server 552 * - If nfs_diskless.mygateway is filled in, use that address as 553 * a default gateway. 554 * - build the rootfs mount point and call mountnfs() to do the rest. 555 */ 556 int 557 nfs_mountroot(struct mount *mp) 558 { 559 struct mount *swap_mp; 560 struct nfsv3_diskless *nd = &nfsv3_diskless; 561 struct socket *so; 562 struct vnode *vp; 563 struct thread *td = curthread; /* XXX */ 564 int error, i; 565 u_long l; 566 char buf[128]; 567 568 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 569 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 570 #endif 571 572 /* 573 * XXX time must be non-zero when we init the interface or else 574 * the arp code will wedge... 575 */ 576 while (mycpu->gd_time_seconds == 0) 577 tsleep(mycpu, 0, "arpkludge", 10); 578 579 /* 580 * The boot code may have passed us a diskless structure. 581 */ 582 kprintf("DISKLESS %d\n", nfs_diskless_valid); 583 if (nfs_diskless_valid == 1) 584 nfs_convert_diskless(); 585 586 /* 587 * NFSv3 is required. 588 */ 589 nd->root_args.flags |= NFSMNT_NFSV3 | NFSMNT_RDIRPLUS; 590 nd->swap_args.flags |= NFSMNT_NFSV3; 591 592 #define SINP(sockaddr) ((struct sockaddr_in *)(sockaddr)) 593 kprintf("nfs_mountroot: interface %s ip %s", 594 nd->myif.ifra_name, 595 inet_ntoa(SINP(&nd->myif.ifra_addr)->sin_addr)); 596 kprintf(" bcast %s", 597 inet_ntoa(SINP(&nd->myif.ifra_broadaddr)->sin_addr)); 598 kprintf(" mask %s\n", 599 inet_ntoa(SINP(&nd->myif.ifra_mask)->sin_addr)); 600 #undef SINP 601 602 /* 603 * XXX splnet, so networks will receive... 604 */ 605 crit_enter(); 606 607 /* 608 * BOOTP does not necessarily have to be compiled into the kernel 609 * for an NFS root to work. If we inherited the network 610 * configuration for PXEBOOT then pxe_setup_nfsdiskless() has figured 611 * out our interface for us and all we need to do is ifconfig the 612 * interface. We only do this if the interface has not already been 613 * ifconfig'd by e.g. BOOTP. 614 */ 615 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, td); 616 if (error) { 617 panic("nfs_mountroot: socreate(%04x): %d", 618 nd->myif.ifra_addr.sa_family, error); 619 } 620 621 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, proc0.p_ucred); 622 if (error) 623 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 624 625 soclose(so, FNONBLOCK); 626 627 /* 628 * If the gateway field is filled in, set it as the default route. 629 */ 630 if (nd->mygateway.sin_len != 0) { 631 struct sockaddr_in mask, sin; 632 633 bzero((caddr_t)&mask, sizeof(mask)); 634 sin = mask; 635 sin.sin_family = AF_INET; 636 sin.sin_len = sizeof(sin); 637 kprintf("nfs_mountroot: gateway %s\n", 638 inet_ntoa(nd->mygateway.sin_addr)); 639 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&sin, 640 (struct sockaddr *)&nd->mygateway, 641 (struct sockaddr *)&mask, 642 RTF_UP | RTF_GATEWAY); 643 if (error) 644 kprintf("nfs_mountroot: unable to set gateway, error %d, continuing anyway\n", error); 645 } 646 647 /* 648 * Create the rootfs mount point. 649 */ 650 nd->root_args.fh = nd->root_fh; 651 nd->root_args.fhsize = nd->root_fhsize; 652 l = ntohl(nd->root_saddr.sin_addr.s_addr); 653 ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 654 (l >> 24) & 0xff, (l >> 16) & 0xff, 655 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 656 kprintf("NFS_ROOT: %s\n",buf); 657 error = nfs_mountdiskless(buf, "/", MNT_RDONLY, &nd->root_saddr, 658 &nd->root_args, td, &vp, &mp); 659 if (error) { 660 mp->mnt_vfc->vfc_refcount--; 661 crit_exit(); 662 return (error); 663 } 664 665 swap_mp = NULL; 666 if (nd->swap_nblks) { 667 668 /* Convert to DEV_BSIZE instead of Kilobyte */ 669 nd->swap_nblks *= 2; 670 671 /* 672 * Create a fake mount point just for the swap vnode so that the 673 * swap file can be on a different server from the rootfs. 674 */ 675 nd->swap_args.fh = nd->swap_fh; 676 nd->swap_args.fhsize = nd->swap_fhsize; 677 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 678 ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 679 (l >> 24) & 0xff, (l >> 16) & 0xff, 680 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 681 kprintf("NFS SWAP: %s\n",buf); 682 error = nfs_mountdiskless(buf, "/swap", 0, &nd->swap_saddr, 683 &nd->swap_args, td, &vp, &swap_mp); 684 if (error) { 685 crit_exit(); 686 return (error); 687 } 688 vfs_unbusy(swap_mp); 689 690 VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size = 691 nd->swap_nblks * DEV_BSIZE ; 692 693 /* 694 * Since the swap file is not the root dir of a file system, 695 * hack it to a regular file. 696 */ 697 vclrflags(vp, VROOT); 698 vref(vp); 699 nfs_setvtype(vp, VREG); 700 swaponvp(td, vp, nd->swap_nblks); 701 } 702 703 mp->mnt_flag |= MNT_ROOTFS; 704 705 /* 706 * This is not really an nfs issue, but it is much easier to 707 * set hostname here and then let the "/etc/rc.xxx" files 708 * mount the right /var based upon its preset value. 709 */ 710 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 711 hostname[MAXHOSTNAMELEN - 1] = '\0'; 712 for (i = 0; i < MAXHOSTNAMELEN; i++) 713 if (hostname[i] == '\0') 714 break; 715 inittodr(ntohl(nd->root_time)); 716 crit_exit(); 717 return (0); 718 } 719 720 /* 721 * Internal version of mount system call for diskless setup. 722 */ 723 static int 724 nfs_mountdiskless(char *path, char *which, int mountflag, 725 struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, 726 struct vnode **vpp, struct mount **mpp) 727 { 728 struct mount *mp; 729 struct sockaddr *nam; 730 int didalloc = 0; 731 int error; 732 733 mp = *mpp; 734 735 if (mp == NULL) { 736 if ((error = vfs_rootmountalloc("nfs", path, &mp)) != 0) { 737 kprintf("nfs_mountroot: NFS not configured"); 738 return (error); 739 } 740 didalloc = 1; 741 } 742 mp->mnt_kern_flag = 0; 743 mp->mnt_flag = mountflag; 744 nam = dup_sockaddr((struct sockaddr *)sin); 745 746 #if defined(BOOTP) || defined(NFS_ROOT) 747 if (args->fhsize == 0) { 748 char *xpath = path; 749 750 kprintf("NFS_ROOT: No FH passed from loader, attempting " 751 "mount rpc..."); 752 while (*xpath && *xpath != ':') 753 ++xpath; 754 if (*xpath) 755 ++xpath; 756 args->fhsize = 0; 757 error = md_mount(sin, xpath, args->fh, &args->fhsize, args, td); 758 if (error) { 759 kprintf("failed error %d.\n", error); 760 goto haderror; 761 } 762 kprintf("success!\n"); 763 } 764 #endif 765 766 if ((error = mountnfs(args, mp, nam, which, path, vpp)) != 0) { 767 #if defined(BOOTP) || defined(NFS_ROOT) 768 haderror: 769 #endif 770 kprintf("nfs_mountroot: mount %s on %s: %d", path, which, error); 771 mp->mnt_vfc->vfc_refcount--; 772 if (didalloc) 773 kfree(mp, M_MOUNT); 774 kfree(nam, M_SONAME); 775 return (error); 776 } 777 *mpp = mp; 778 return (0); 779 } 780 781 static void 782 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp) 783 { 784 int adjsock; 785 int maxio; 786 787 crit_enter(); 788 /* 789 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 790 * no sense in that context. 791 */ 792 if (nmp->nm_sotype == SOCK_STREAM) { 793 nmp->nm_flag &= ~NFSMNT_NOCONN; 794 argp->flags &= ~NFSMNT_NOCONN; 795 } 796 797 /* 798 * readdirplus is NFSv3 only. 799 */ 800 if ((argp->flags & NFSMNT_NFSV3) == 0) { 801 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 802 argp->flags &= ~NFSMNT_RDIRPLUS; 803 } 804 805 /* 806 * Re-bind if rsrvd port flag has changed 807 */ 808 adjsock = (nmp->nm_flag & NFSMNT_RESVPORT) != 809 (argp->flags & NFSMNT_RESVPORT); 810 811 /* Update flags atomically. Don't change the lock bits. */ 812 nmp->nm_flag = argp->flags | nmp->nm_flag; 813 crit_exit(); 814 815 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 816 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 817 if (nmp->nm_timeo < NFS_MINTIMEO) 818 nmp->nm_timeo = NFS_MINTIMEO; 819 else if (nmp->nm_timeo > NFS_MAXTIMEO) 820 nmp->nm_timeo = NFS_MAXTIMEO; 821 } 822 823 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 824 nmp->nm_retry = argp->retrans; 825 if (nmp->nm_retry > NFS_MAXREXMIT) 826 nmp->nm_retry = NFS_MAXREXMIT; 827 } 828 829 /* 830 * These parameters effect the buffer cache and cannot be changed 831 * once we've successfully mounted. 832 */ 833 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 834 maxio = nfs_iosize(argp->flags & NFSMNT_NFSV3, nmp->nm_sotype); 835 836 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 837 nmp->nm_wsize = argp->wsize; 838 /* Round down to multiple of blocksize */ 839 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 840 if (nmp->nm_wsize <= 0) 841 nmp->nm_wsize = NFS_FABLKSIZE; 842 } 843 if (nmp->nm_wsize > maxio) 844 nmp->nm_wsize = maxio; 845 if (nmp->nm_wsize > MAXBSIZE) 846 nmp->nm_wsize = MAXBSIZE; 847 848 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 849 nmp->nm_rsize = argp->rsize; 850 /* Round down to multiple of blocksize */ 851 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 852 if (nmp->nm_rsize <= 0) 853 nmp->nm_rsize = NFS_FABLKSIZE; 854 } 855 if (nmp->nm_rsize > maxio) 856 nmp->nm_rsize = maxio; 857 if (nmp->nm_rsize > MAXBSIZE) 858 nmp->nm_rsize = MAXBSIZE; 859 860 if ((argp->flags & NFSMNT_READDIRSIZE) && 861 argp->readdirsize > 0) { 862 nmp->nm_readdirsize = argp->readdirsize; 863 } 864 if (nmp->nm_readdirsize > maxio) 865 nmp->nm_readdirsize = maxio; 866 if (nmp->nm_readdirsize > nmp->nm_rsize) 867 nmp->nm_readdirsize = nmp->nm_rsize; 868 } 869 870 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 871 nmp->nm_acregmin = argp->acregmin; 872 else 873 nmp->nm_acregmin = NFS_MINATTRTIMO; 874 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 875 nmp->nm_acregmax = argp->acregmax; 876 else 877 nmp->nm_acregmax = NFS_MAXATTRTIMO; 878 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 879 nmp->nm_acdirmin = argp->acdirmin; 880 else 881 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 882 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 883 nmp->nm_acdirmax = argp->acdirmax; 884 else 885 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 886 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 887 nmp->nm_acdirmin = nmp->nm_acdirmax; 888 if (nmp->nm_acregmin > nmp->nm_acregmax) 889 nmp->nm_acregmin = nmp->nm_acregmax; 890 891 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 892 if (argp->maxgrouplist <= NFS_MAXGRPS) 893 nmp->nm_numgrps = argp->maxgrouplist; 894 else 895 nmp->nm_numgrps = NFS_MAXGRPS; 896 } 897 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 898 if (argp->readahead <= NFS_MAXRAHEAD) 899 nmp->nm_readahead = argp->readahead; 900 else 901 nmp->nm_readahead = NFS_MAXRAHEAD; 902 } 903 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 904 if (argp->deadthresh <= NFS_NEVERDEAD) 905 nmp->nm_deadthresh = argp->deadthresh; 906 else 907 nmp->nm_deadthresh = NFS_NEVERDEAD; 908 } 909 910 if (nmp->nm_so && adjsock) { 911 nfs_safedisconnect(nmp); 912 if (nmp->nm_sotype == SOCK_DGRAM) 913 while (nfs_connect(nmp, NULL)) { 914 kprintf("nfs_args: retrying connect\n"); 915 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 916 } 917 } 918 } 919 920 /* 921 * VFS Operations. 922 * 923 * mount system call 924 * It seems a bit dumb to copyinstr() the host and path here and then 925 * bcopy() them in mountnfs(), but I wanted to detect errors before 926 * doing the sockargs() call because sockargs() allocates an mbuf and 927 * an error after that means that I have to release the mbuf. 928 */ 929 /* ARGSUSED */ 930 static int 931 nfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 932 { 933 int error; 934 struct nfs_args args; 935 struct sockaddr *nam; 936 struct vnode *vp; 937 char pth[MNAMELEN], hst[MNAMELEN]; 938 size_t len; 939 u_char nfh[NFSX_V3FHMAX]; 940 941 if (path == NULL) { 942 nfs_mountroot(mp); 943 return (0); 944 } 945 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 946 if (error) 947 return (error); 948 if (args.version != NFS_ARGSVERSION) { 949 #ifdef COMPAT_PRELITE2 950 /* 951 * If the argument version is unknown, then assume the 952 * caller is a pre-lite2 4.4BSD client and convert its 953 * arguments. 954 */ 955 struct onfs_args oargs; 956 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args)); 957 if (error) 958 return (error); 959 nfs_convert_oargs(&args,&oargs); 960 #else /* !COMPAT_PRELITE2 */ 961 return (EPROGMISMATCH); 962 #endif /* COMPAT_PRELITE2 */ 963 } 964 if (mp->mnt_flag & MNT_UPDATE) { 965 struct nfsmount *nmp = VFSTONFS(mp); 966 967 if (nmp == NULL) 968 return (EIO); 969 /* 970 * When doing an update, we can't change from or to 971 * v3, or change cookie translation, or rsize or wsize. 972 */ 973 args.flags &= ~(NFSMNT_NFSV3 | NFSMNT_RSIZE | NFSMNT_WSIZE); 974 args.flags |= nmp->nm_flag & (NFSMNT_NFSV3); 975 nfs_decode_args(nmp, &args); 976 return (0); 977 } 978 979 /* 980 * Make the nfs_ip_paranoia sysctl serve as the default connection 981 * or no-connection mode for those protocols that support 982 * no-connection mode (the flag will be cleared later for protocols 983 * that do not support no-connection mode). This will allow a client 984 * to receive replies from a different IP then the request was 985 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 986 * not 0. 987 */ 988 if (nfs_ip_paranoia == 0) 989 args.flags |= NFSMNT_NOCONN; 990 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 991 return (EINVAL); 992 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 993 if (error) 994 return (error); 995 error = copyinstr(path, pth, MNAMELEN-1, &len); 996 if (error) 997 return (error); 998 bzero(&pth[len], MNAMELEN - len); 999 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 1000 if (error) 1001 return (error); 1002 bzero(&hst[len], MNAMELEN - len); 1003 /* sockargs() call must be after above copyin() calls */ 1004 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 1005 if (error) 1006 return (error); 1007 args.fh = nfh; 1008 error = mountnfs(&args, mp, nam, pth, hst, &vp); 1009 return (error); 1010 } 1011 1012 /* 1013 * Common code for mount and mountroot 1014 */ 1015 static int 1016 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam, 1017 char *pth, char *hst, struct vnode **vpp) 1018 { 1019 struct nfsmount *nmp; 1020 struct nfsnode *np; 1021 int error; 1022 int rxcpu; 1023 int txcpu; 1024 1025 if (mp->mnt_flag & MNT_UPDATE) { 1026 nmp = VFSTONFS(mp); 1027 /* update paths, file handles, etc, here XXX */ 1028 kfree(nam, M_SONAME); 1029 return (0); 1030 } else { 1031 nmp = objcache_get(nfsmount_objcache, M_WAITOK); 1032 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 1033 mtx_init(&nmp->nm_rxlock, "nfsrx"); 1034 mtx_init(&nmp->nm_txlock, "nfstx"); 1035 TAILQ_INIT(&nmp->nm_uidlruhead); 1036 TAILQ_INIT(&nmp->nm_bioq); 1037 TAILQ_INIT(&nmp->nm_reqq); 1038 TAILQ_INIT(&nmp->nm_reqtxq); 1039 TAILQ_INIT(&nmp->nm_reqrxq); 1040 mp->mnt_data = (qaddr_t)nmp; 1041 lwkt_token_init(&nmp->nm_token, "nfs_token"); 1042 } 1043 vfs_getnewfsid(mp); 1044 nmp->nm_mountp = mp; 1045 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; 1046 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 1047 1048 lwkt_gettoken(&nmp->nm_token); 1049 1050 /* 1051 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 1052 * high, depending on whether we end up with negative offsets in 1053 * the client or server somewhere. 2GB-1 may be safer. 1054 * 1055 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 1056 * that we can handle until we find out otherwise. Note that seek 1057 * offsets are signed. 1058 */ 1059 if ((argp->flags & NFSMNT_NFSV3) == 0) 1060 nmp->nm_maxfilesize = 0xffffffffLL; 1061 else 1062 nmp->nm_maxfilesize = 0x7fffffffffffffffLL; 1063 1064 nmp->nm_timeo = NFS_TIMEO; 1065 nmp->nm_retry = NFS_RETRANS; 1066 nmp->nm_wsize = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 1067 nmp->nm_rsize = nmp->nm_wsize; 1068 nmp->nm_readdirsize = NFS_READDIRSIZE; 1069 nmp->nm_numgrps = NFS_MAXGRPS; 1070 nmp->nm_readahead = NFS_DEFRAHEAD; 1071 nmp->nm_deadthresh = NFS_DEADTHRESH; 1072 nmp->nm_fhsize = argp->fhsize; 1073 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 1074 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 1075 nmp->nm_nam = nam; 1076 /* Set up the sockets and per-host congestion */ 1077 nmp->nm_sotype = argp->sotype; 1078 nmp->nm_soproto = argp->proto; 1079 nmp->nm_cred = crhold(proc0.p_ucred); 1080 1081 nfs_decode_args(nmp, argp); 1082 1083 /* 1084 * For Connection based sockets (TCP,...) defer the connect until 1085 * the first request, in case the server is not responding. 1086 */ 1087 if (nmp->nm_sotype == SOCK_DGRAM && 1088 (error = nfs_connect(nmp, NULL))) 1089 goto bad; 1090 1091 /* 1092 * This is silly, but it has to be set so that vinifod() works. 1093 * We do not want to do an nfs_statfs() here since we can get 1094 * stuck on a dead server and we are holding a lock on the mount 1095 * point. 1096 */ 1097 mp->mnt_stat.f_iosize = 1098 nfs_iosize(nmp->nm_flag & NFSMNT_NFSV3, nmp->nm_sotype); 1099 1100 /* 1101 * Install vop_ops for our vnops 1102 */ 1103 vfs_add_vnodeops(mp, &nfsv2_vnode_vops, &mp->mnt_vn_norm_ops); 1104 vfs_add_vnodeops(mp, &nfsv2_spec_vops, &mp->mnt_vn_spec_ops); 1105 vfs_add_vnodeops(mp, &nfsv2_fifo_vops, &mp->mnt_vn_fifo_ops); 1106 1107 /* 1108 * A reference count is needed on the nfsnode representing the 1109 * remote root. If this object is not persistent, then backward 1110 * traversals of the mount point (i.e. "..") will not work if 1111 * the nfsnode gets flushed out of the cache. Ufs does not have 1112 * this problem, because one can identify root inodes by their 1113 * number == ROOTINO (2). 1114 */ 1115 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, NULL); 1116 if (error) 1117 goto bad; 1118 *vpp = NFSTOV(np); 1119 1120 /* 1121 * Retrieval of mountpoint attributes is delayed until nfs_rot 1122 * or nfs_statfs are first called. This will happen either when 1123 * we first traverse the mount point or if somebody does a df(1). 1124 * 1125 * NFSSTA_GOTFSINFO is used to flag if we have successfully 1126 * retrieved mountpoint attributes. In the case of NFSv3 we 1127 * also flag static fsinfo. 1128 */ 1129 if (*vpp != NULL) 1130 (*vpp)->v_type = VNON; 1131 1132 /* 1133 * Lose the lock but keep the ref. 1134 */ 1135 vn_unlock(*vpp); 1136 lwkt_gettoken(&nfs_token); 1137 TAILQ_INSERT_TAIL(&nfs_mountq, nmp, nm_entry); 1138 lwkt_reltoken(&nfs_token); 1139 1140 switch(ncpus) { 1141 case 0: 1142 case 1: 1143 rxcpu = 0; 1144 txcpu = 0; 1145 break; 1146 case 2: 1147 rxcpu = 0; 1148 txcpu = 1; 1149 break; 1150 default: 1151 rxcpu = -1; 1152 txcpu = -1; 1153 break; 1154 } 1155 1156 /* 1157 * Start the reader and writer threads. 1158 */ 1159 lwkt_create(nfssvc_iod_reader, nmp, &nmp->nm_rxthread, 1160 NULL, 0, rxcpu, "nfsiod_rx"); 1161 lwkt_create(nfssvc_iod_writer, nmp, &nmp->nm_txthread, 1162 NULL, 0, txcpu, "nfsiod_tx"); 1163 lwkt_reltoken(&nmp->nm_token); 1164 return (0); 1165 bad: 1166 nfs_disconnect(nmp); 1167 lwkt_reltoken(&nmp->nm_token); 1168 nfs_free_mount(nmp); 1169 return (error); 1170 } 1171 1172 /* 1173 * unmount system call 1174 */ 1175 static int 1176 nfs_unmount(struct mount *mp, int mntflags) 1177 { 1178 struct nfsmount *nmp; 1179 int error, flags = 0; 1180 1181 nmp = VFSTONFS(mp); 1182 lwkt_gettoken(&nmp->nm_token); 1183 if (mntflags & MNT_FORCE) { 1184 flags |= FORCECLOSE; 1185 nmp->nm_flag |= NFSMNT_FORCE; 1186 } 1187 1188 /* 1189 * Goes something like this.. 1190 * - Call vflush() to clear out vnodes for this file system 1191 * - Close the socket 1192 * - Free up the data structures 1193 */ 1194 /* In the forced case, cancel any outstanding requests. */ 1195 if (flags & FORCECLOSE) { 1196 error = nfs_nmcancelreqs(nmp); 1197 if (error) { 1198 kprintf("NFS: %s: Unable to cancel all requests\n", 1199 mp->mnt_stat.f_mntfromname); 1200 /* continue anyway */ 1201 } 1202 } 1203 1204 /* 1205 * Must handshake with nfs_clientd() if it is active. XXX 1206 */ 1207 nmp->nm_state |= NFSSTA_DISMINPROG; 1208 1209 /* 1210 * We hold 1 extra ref on the root vnode; see comment in mountnfs(). 1211 * 1212 * If this doesn't work and we are doing a forced unmount we continue 1213 * anyway. 1214 */ 1215 error = vflush(mp, 1, flags); 1216 if (error) { 1217 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1218 if ((flags & FORCECLOSE) == 0) { 1219 lwkt_reltoken(&nmp->nm_token); 1220 return (error); 1221 } 1222 } 1223 1224 /* 1225 * We are now committed to the unmount. 1226 * For NQNFS, let the server daemon free the nfsmount structure. 1227 */ 1228 if (nmp->nm_flag & NFSMNT_KERB) 1229 nmp->nm_state |= NFSSTA_DISMNT; 1230 nfssvc_iod_stop1(nmp); 1231 nfs_disconnect(nmp); 1232 nfssvc_iod_stop2(nmp); 1233 1234 lwkt_gettoken(&nfs_token); 1235 TAILQ_REMOVE(&nfs_mountq, nmp, nm_entry); 1236 lwkt_reltoken(&nfs_token); 1237 1238 lwkt_reltoken(&nmp->nm_token); 1239 1240 if ((nmp->nm_flag & NFSMNT_KERB) == 0) { 1241 nfs_free_mount(nmp); 1242 } 1243 return (0); 1244 } 1245 1246 void 1247 nfs_free_mount(struct nfsmount *nmp) 1248 { 1249 if (nmp->nm_cred) { 1250 crfree(nmp->nm_cred); 1251 nmp->nm_cred = NULL; 1252 } 1253 if (nmp->nm_nam) { 1254 kfree(nmp->nm_nam, M_SONAME); 1255 nmp->nm_nam = NULL; 1256 } 1257 objcache_put(nfsmount_objcache, nmp); 1258 } 1259 1260 /* 1261 * Return root of a filesystem 1262 */ 1263 static int 1264 nfs_root(struct mount *mp, struct vnode **vpp) 1265 { 1266 struct vnode *vp; 1267 struct nfsmount *nmp; 1268 struct vattr attrs; 1269 struct nfsnode *np; 1270 int error; 1271 1272 nmp = VFSTONFS(mp); 1273 lwkt_gettoken(&nmp->nm_token); 1274 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, NULL); 1275 if (error) { 1276 lwkt_reltoken(&nmp->nm_token); 1277 return (error); 1278 } 1279 vp = NFSTOV(np); 1280 1281 /* 1282 * Get transfer parameters and root vnode attributes 1283 * 1284 * NOTE: nfs_fsinfo() is expected to override the default 1285 * f_iosize we set. 1286 */ 1287 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 1288 if (nmp->nm_flag & NFSMNT_NFSV3) { 1289 mp->mnt_stat.f_iosize = nfs_iosize(1, nmp->nm_sotype); 1290 error = nfs_fsinfo(nmp, vp, curthread); 1291 } else { 1292 if ((error = VOP_GETATTR(vp, &attrs)) == 0) 1293 nmp->nm_state |= NFSSTA_GOTFSINFO; 1294 1295 } 1296 } else { 1297 /* 1298 * The root vnode is usually cached by the namecache so do not 1299 * try to avoid going over the wire even if we have previous 1300 * information cached. A stale NFS mount can loop 1301 * forever resolving the root vnode if we return no-error when 1302 * there is in fact an error. 1303 */ 1304 np->n_attrstamp = 0; 1305 error = VOP_GETATTR(vp, &attrs); 1306 } 1307 if (vp->v_type == VNON) 1308 nfs_setvtype(vp, VDIR); 1309 vsetflags(vp, VROOT); 1310 if (error) 1311 vput(vp); 1312 else 1313 *vpp = vp; 1314 lwkt_reltoken(&nmp->nm_token); 1315 return (error); 1316 } 1317 1318 struct scaninfo { 1319 int rescan; 1320 int waitfor; 1321 int allerror; 1322 }; 1323 1324 static int nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 1325 1326 /* 1327 * Flush out the buffer cache 1328 */ 1329 /* ARGSUSED */ 1330 static int 1331 nfs_sync(struct mount *mp, int waitfor) 1332 { 1333 struct nfsmount *nmp = VFSTONFS(mp); 1334 struct scaninfo scaninfo; 1335 int error; 1336 1337 scaninfo.rescan = 1; 1338 scaninfo.waitfor = waitfor; 1339 scaninfo.allerror = 0; 1340 1341 /* 1342 * Force stale buffer cache information to be flushed. 1343 */ 1344 lwkt_gettoken(&nmp->nm_token); 1345 error = 0; 1346 if ((waitfor & MNT_LAZY) == 0) { 1347 while (error == 0 && scaninfo.rescan) { 1348 scaninfo.rescan = 0; 1349 error = vsyncscan(mp, VMSC_GETVP, 1350 nfs_sync_scan2, &scaninfo); 1351 } 1352 } 1353 lwkt_reltoken(&nmp->nm_token); 1354 return(error); 1355 } 1356 1357 static int 1358 nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 1359 { 1360 struct scaninfo *info = data; 1361 int error; 1362 1363 if (vp->v_type == VNON || vp->v_type == VBAD) 1364 return(0); 1365 error = VOP_FSYNC(vp, info->waitfor, 0); 1366 if (error) 1367 info->allerror = error; 1368 return(0); 1369 } 1370 1371