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