nfs_vnops.c revision 84827
1/* 2 * Copyright (c) 1989, 1993 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_vnops.c 8.16 (Berkeley) 5/27/95 37 */ 38 39#include <sys/cdefs.h> 40__FBSDID("$FreeBSD: head/sys/nfsclient/nfs_vnops.c 84827 2001-10-11 23:38:17Z jhb $"); 41 42/* 43 * vnode op calls for Sun NFS version 2 and 3 44 */ 45 46#include "opt_inet.h" 47 48#include <sys/param.h> 49#include <sys/kernel.h> 50#include <sys/systm.h> 51#include <sys/resourcevar.h> 52#include <sys/proc.h> 53#include <sys/mount.h> 54#include <sys/bio.h> 55#include <sys/buf.h> 56#include <sys/malloc.h> 57#include <sys/mbuf.h> 58#include <sys/namei.h> 59#include <sys/socket.h> 60#include <sys/vnode.h> 61#include <sys/dirent.h> 62#include <sys/fcntl.h> 63#include <sys/lockf.h> 64#include <sys/stat.h> 65#include <sys/sysctl.h> 66 67#include <vm/vm.h> 68#include <vm/vm_extern.h> 69 70#include <fs/fifofs/fifo.h> 71 72#include <nfs/rpcv2.h> 73#include <nfs/nfsproto.h> 74#include <nfsclient/nfs.h> 75#include <nfsclient/nfsnode.h> 76#include <nfsclient/nfsmount.h> 77#include <nfsclient/nfs_lock.h> 78#include <nfs/xdr_subs.h> 79#include <nfsclient/nfsm_subs.h> 80 81#include <net/if.h> 82#include <netinet/in.h> 83#include <netinet/in_var.h> 84 85/* Defs */ 86#define TRUE 1 87#define FALSE 0 88 89/* 90 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these 91 * calls are not in getblk() and brelse() so that they would not be necessary 92 * here. 93 */ 94#ifndef B_VMIO 95#define vfs_busy_pages(bp, f) 96#endif 97 98static int nfsspec_read(struct vop_read_args *); 99static int nfsspec_write(struct vop_write_args *); 100static int nfsfifo_read(struct vop_read_args *); 101static int nfsfifo_write(struct vop_write_args *); 102static int nfsspec_close(struct vop_close_args *); 103static int nfsfifo_close(struct vop_close_args *); 104static int nfs_flush(struct vnode *, struct ucred *, int, struct thread *, 105 int); 106static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *, 107 struct thread *); 108static int nfs_lookup(struct vop_lookup_args *); 109static int nfs_create(struct vop_create_args *); 110static int nfs_mknod(struct vop_mknod_args *); 111static int nfs_open(struct vop_open_args *); 112static int nfs_close(struct vop_close_args *); 113static int nfs_access(struct vop_access_args *); 114static int nfs_getattr(struct vop_getattr_args *); 115static int nfs_setattr(struct vop_setattr_args *); 116static int nfs_read(struct vop_read_args *); 117static int nfs_fsync(struct vop_fsync_args *); 118static int nfs_remove(struct vop_remove_args *); 119static int nfs_link(struct vop_link_args *); 120static int nfs_rename(struct vop_rename_args *); 121static int nfs_mkdir(struct vop_mkdir_args *); 122static int nfs_rmdir(struct vop_rmdir_args *); 123static int nfs_symlink(struct vop_symlink_args *); 124static int nfs_readdir(struct vop_readdir_args *); 125static int nfs_strategy(struct vop_strategy_args *); 126static int nfs_lookitup(struct vnode *, const char *, int, 127 struct ucred *, struct thread *, struct nfsnode **); 128static int nfs_sillyrename(struct vnode *, struct vnode *, 129 struct componentname *); 130static int nfsspec_access(struct vop_access_args *); 131static int nfs_readlink(struct vop_readlink_args *); 132static int nfs_print(struct vop_print_args *); 133static int nfs_advlock(struct vop_advlock_args *); 134 135/* 136 * Global vfs data structures for nfs 137 */ 138vop_t **nfsv2_vnodeop_p; 139static struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = { 140 { &vop_default_desc, (vop_t *) vop_defaultop }, 141 { &vop_access_desc, (vop_t *) nfs_access }, 142 { &vop_advlock_desc, (vop_t *) nfs_advlock }, 143 { &vop_close_desc, (vop_t *) nfs_close }, 144 { &vop_create_desc, (vop_t *) nfs_create }, 145 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 146 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 147 { &vop_getpages_desc, (vop_t *) nfs_getpages }, 148 { &vop_putpages_desc, (vop_t *) nfs_putpages }, 149 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 150 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 151 { &vop_lease_desc, (vop_t *) vop_null }, 152 { &vop_link_desc, (vop_t *) nfs_link }, 153 { &vop_lock_desc, (vop_t *) vop_sharedlock }, 154 { &vop_lookup_desc, (vop_t *) nfs_lookup }, 155 { &vop_mkdir_desc, (vop_t *) nfs_mkdir }, 156 { &vop_mknod_desc, (vop_t *) nfs_mknod }, 157 { &vop_open_desc, (vop_t *) nfs_open }, 158 { &vop_print_desc, (vop_t *) nfs_print }, 159 { &vop_read_desc, (vop_t *) nfs_read }, 160 { &vop_readdir_desc, (vop_t *) nfs_readdir }, 161 { &vop_readlink_desc, (vop_t *) nfs_readlink }, 162 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 163 { &vop_remove_desc, (vop_t *) nfs_remove }, 164 { &vop_rename_desc, (vop_t *) nfs_rename }, 165 { &vop_rmdir_desc, (vop_t *) nfs_rmdir }, 166 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 167 { &vop_strategy_desc, (vop_t *) nfs_strategy }, 168 { &vop_symlink_desc, (vop_t *) nfs_symlink }, 169 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 170 { &vop_write_desc, (vop_t *) nfs_write }, 171 { NULL, NULL } 172}; 173static struct vnodeopv_desc nfsv2_vnodeop_opv_desc = 174 { &nfsv2_vnodeop_p, nfsv2_vnodeop_entries }; 175VNODEOP_SET(nfsv2_vnodeop_opv_desc); 176 177/* 178 * Special device vnode ops 179 */ 180vop_t **spec_nfsv2nodeop_p; 181static struct vnodeopv_entry_desc nfsv2_specop_entries[] = { 182 { &vop_default_desc, (vop_t *) spec_vnoperate }, 183 { &vop_access_desc, (vop_t *) nfsspec_access }, 184 { &vop_close_desc, (vop_t *) nfsspec_close }, 185 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 186 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 187 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 188 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 189 { &vop_lock_desc, (vop_t *) vop_sharedlock }, 190 { &vop_print_desc, (vop_t *) nfs_print }, 191 { &vop_read_desc, (vop_t *) nfsspec_read }, 192 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 193 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 194 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 195 { &vop_write_desc, (vop_t *) nfsspec_write }, 196 { NULL, NULL } 197}; 198static struct vnodeopv_desc spec_nfsv2nodeop_opv_desc = 199 { &spec_nfsv2nodeop_p, nfsv2_specop_entries }; 200VNODEOP_SET(spec_nfsv2nodeop_opv_desc); 201 202vop_t **fifo_nfsv2nodeop_p; 203static struct vnodeopv_entry_desc nfsv2_fifoop_entries[] = { 204 { &vop_default_desc, (vop_t *) fifo_vnoperate }, 205 { &vop_access_desc, (vop_t *) nfsspec_access }, 206 { &vop_close_desc, (vop_t *) nfsfifo_close }, 207 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 208 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 209 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 210 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 211 { &vop_lock_desc, (vop_t *) vop_sharedlock }, 212 { &vop_print_desc, (vop_t *) nfs_print }, 213 { &vop_read_desc, (vop_t *) nfsfifo_read }, 214 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 215 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 216 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 217 { &vop_write_desc, (vop_t *) nfsfifo_write }, 218 { NULL, NULL } 219}; 220static struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc = 221 { &fifo_nfsv2nodeop_p, nfsv2_fifoop_entries }; 222VNODEOP_SET(fifo_nfsv2nodeop_opv_desc); 223 224static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 225 struct componentname *cnp, struct vattr *vap); 226static int nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 227 struct ucred *cred, struct thread *td); 228static int nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, 229 int fnamelen, struct vnode *tdvp, 230 const char *tnameptr, int tnamelen, 231 struct ucred *cred, struct thread *td); 232static int nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 233 struct sillyrename *sp); 234 235/* 236 * Global variables 237 */ 238struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON]; 239struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; 240int nfs_numasync = 0; 241#define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1)) 242 243SYSCTL_DECL(_vfs_nfs); 244 245static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 246SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 247 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 248 249static int nfsv3_commit_on_close = 0; 250SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 251 &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); 252#if 0 253SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 254 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 255 256SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 257 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 258#endif 259 260#define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 261 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 262 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 263static int 264nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td, 265 struct ucred *cred) 266{ 267 const int v3 = 1; 268 u_int32_t *tl; 269 int error = 0, attrflag; 270 271 struct mbuf *mreq, *mrep, *md, *mb; 272 caddr_t bpos, dpos; 273 u_int32_t rmode; 274 struct nfsnode *np = VTONFS(vp); 275 276 nfsstats.rpccnt[NFSPROC_ACCESS]++; 277 mreq = nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 278 mb = mreq; 279 bpos = mtod(mb, caddr_t); 280 nfsm_fhtom(vp, v3); 281 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 282 *tl = txdr_unsigned(wmode); 283 nfsm_request(vp, NFSPROC_ACCESS, td, cred); 284 nfsm_postop_attr(vp, attrflag); 285 if (!error) { 286 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 287 rmode = fxdr_unsigned(u_int32_t, *tl); 288 np->n_mode = rmode; 289 np->n_modeuid = cred->cr_uid; 290 np->n_modestamp = time_second; 291 } 292 m_freem(mrep); 293nfsmout: 294 return error; 295} 296 297/* 298 * nfs access vnode op. 299 * For nfs version 2, just return ok. File accesses may fail later. 300 * For nfs version 3, use the access rpc to check accessibility. If file modes 301 * are changed on the server, accesses might still fail later. 302 */ 303static int 304nfs_access(struct vop_access_args *ap) 305{ 306 struct vnode *vp = ap->a_vp; 307 int error = 0; 308 u_int32_t mode, wmode; 309 int v3 = NFS_ISV3(vp); 310 struct nfsnode *np = VTONFS(vp); 311 312 /* 313 * Disallow write attempts on filesystems mounted read-only; 314 * unless the file is a socket, fifo, or a block or character 315 * device resident on the filesystem. 316 */ 317 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 318 switch (vp->v_type) { 319 case VREG: 320 case VDIR: 321 case VLNK: 322 return (EROFS); 323 default: 324 break; 325 } 326 } 327 /* 328 * For nfs v3, check to see if we have done this recently, and if 329 * so return our cached result instead of making an ACCESS call. 330 * If not, do an access rpc, otherwise you are stuck emulating 331 * ufs_access() locally using the vattr. This may not be correct, 332 * since the server may apply other access criteria such as 333 * client uid-->server uid mapping that we do not know about. 334 */ 335 if (v3) { 336 if (ap->a_mode & VREAD) 337 mode = NFSV3ACCESS_READ; 338 else 339 mode = 0; 340 if (vp->v_type != VDIR) { 341 if (ap->a_mode & VWRITE) 342 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 343 if (ap->a_mode & VEXEC) 344 mode |= NFSV3ACCESS_EXECUTE; 345 } else { 346 if (ap->a_mode & VWRITE) 347 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 348 NFSV3ACCESS_DELETE); 349 if (ap->a_mode & VEXEC) 350 mode |= NFSV3ACCESS_LOOKUP; 351 } 352 /* XXX safety belt, only make blanket request if caching */ 353 if (nfsaccess_cache_timeout > 0) { 354 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 355 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 356 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 357 } else { 358 wmode = mode; 359 } 360 361 /* 362 * Does our cached result allow us to give a definite yes to 363 * this request? 364 */ 365 if ((time_second < (np->n_modestamp + nfsaccess_cache_timeout)) && 366 (ap->a_cred->cr_uid == np->n_modeuid) && 367 ((np->n_mode & mode) == mode)) { 368 nfsstats.accesscache_hits++; 369 } else { 370 /* 371 * Either a no, or a don't know. Go to the wire. 372 */ 373 nfsstats.accesscache_misses++; 374 error = nfs3_access_otw(vp, wmode, ap->a_td,ap->a_cred); 375 if (!error) { 376 if ((np->n_mode & mode) != mode) { 377 error = EACCES; 378 } 379 } 380 } 381 return (error); 382 } else { 383 if ((error = nfsspec_access(ap)) != 0) 384 return (error); 385 386 /* 387 * Attempt to prevent a mapped root from accessing a file 388 * which it shouldn't. We try to read a byte from the file 389 * if the user is root and the file is not zero length. 390 * After calling nfsspec_access, we should have the correct 391 * file size cached. 392 */ 393 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD) 394 && VTONFS(vp)->n_size > 0) { 395 struct iovec aiov; 396 struct uio auio; 397 char buf[1]; 398 399 aiov.iov_base = buf; 400 aiov.iov_len = 1; 401 auio.uio_iov = &aiov; 402 auio.uio_iovcnt = 1; 403 auio.uio_offset = 0; 404 auio.uio_resid = 1; 405 auio.uio_segflg = UIO_SYSSPACE; 406 auio.uio_rw = UIO_READ; 407 auio.uio_td = ap->a_td; 408 409 if (vp->v_type == VREG) 410 error = nfs_readrpc(vp, &auio, ap->a_cred); 411 else if (vp->v_type == VDIR) { 412 char* bp; 413 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 414 aiov.iov_base = bp; 415 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 416 error = nfs_readdirrpc(vp, &auio, ap->a_cred); 417 free(bp, M_TEMP); 418 } else if (vp->v_type == VLNK) 419 error = nfs_readlinkrpc(vp, &auio, ap->a_cred); 420 else 421 error = EACCES; 422 } 423 return (error); 424 } 425} 426 427/* 428 * nfs open vnode op 429 * Check to see if the type is ok 430 * and that deletion is not in progress. 431 * For paged in text files, you will need to flush the page cache 432 * if consistency is lost. 433 */ 434/* ARGSUSED */ 435static int 436nfs_open(struct vop_open_args *ap) 437{ 438 struct vnode *vp = ap->a_vp; 439 struct nfsnode *np = VTONFS(vp); 440 struct vattr vattr; 441 int error; 442 443 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 444#ifdef DIAGNOSTIC 445 printf("open eacces vtyp=%d\n", vp->v_type); 446#endif 447 return (EACCES); 448 } 449 /* 450 * Get a valid lease. If cached data is stale, flush it. 451 */ 452 if (np->n_flag & NMODIFIED) { 453 if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, 454 ap->a_td, 1)) == EINTR) 455 return (error); 456 np->n_attrstamp = 0; 457 if (vp->v_type == VDIR) 458 np->n_direofoffset = 0; 459 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td); 460 if (error) 461 return (error); 462 np->n_mtime = vattr.va_mtime.tv_sec; 463 } else { 464 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td); 465 if (error) 466 return (error); 467 if (np->n_mtime != vattr.va_mtime.tv_sec) { 468 if (vp->v_type == VDIR) 469 np->n_direofoffset = 0; 470 if ((error = nfs_vinvalbuf(vp, V_SAVE, 471 ap->a_cred, ap->a_td, 1)) == EINTR) 472 return (error); 473 np->n_mtime = vattr.va_mtime.tv_sec; 474 } 475 } 476 np->n_attrstamp = 0; /* For Open/Close consistency */ 477 return (0); 478} 479 480/* 481 * nfs close vnode op 482 * What an NFS client should do upon close after writing is a debatable issue. 483 * Most NFS clients push delayed writes to the server upon close, basically for 484 * two reasons: 485 * 1 - So that any write errors may be reported back to the client process 486 * doing the close system call. By far the two most likely errors are 487 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 488 * 2 - To put a worst case upper bound on cache inconsistency between 489 * multiple clients for the file. 490 * There is also a consistency problem for Version 2 of the protocol w.r.t. 491 * not being able to tell if other clients are writing a file concurrently, 492 * since there is no way of knowing if the changed modify time in the reply 493 * is only due to the write for this client. 494 * (NFS Version 3 provides weak cache consistency data in the reply that 495 * should be sufficient to detect and handle this case.) 496 * 497 * The current code does the following: 498 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 499 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 500 * or commit them (this satisfies 1 and 2 except for the 501 * case where the server crashes after this close but 502 * before the commit RPC, which is felt to be "good 503 * enough". Changing the last argument to nfs_flush() to 504 * a 1 would force a commit operation, if it is felt a 505 * commit is necessary now. 506 */ 507/* ARGSUSED */ 508static int 509nfs_close(struct vop_close_args *ap) 510{ 511 struct vnode *vp = ap->a_vp; 512 struct nfsnode *np = VTONFS(vp); 513 int error = 0; 514 515 if (vp->v_type == VREG) { 516 if (np->n_flag & NMODIFIED) { 517 if (NFS_ISV3(vp)) { 518 /* 519 * Under NFSv3 we have dirty buffers to dispose of. We 520 * must flush them to the NFS server. We have the option 521 * of waiting all the way through the commit rpc or just 522 * waiting for the initial write. The default is to only 523 * wait through the initial write so the data is in the 524 * server's cache, which is roughly similar to the state 525 * a standard disk subsystem leaves the file in on close(). 526 * 527 * We cannot clear the NMODIFIED bit in np->n_flag due to 528 * potential races with other processes, and certainly 529 * cannot clear it if we don't commit. 530 */ 531 int cm = nfsv3_commit_on_close ? 1 : 0; 532 error = nfs_flush(vp, ap->a_cred, MNT_WAIT, ap->a_td, cm); 533 /* np->n_flag &= ~NMODIFIED; */ 534 } else { 535 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_td, 1); 536 } 537 np->n_attrstamp = 0; 538 } 539 if (np->n_flag & NWRITEERR) { 540 np->n_flag &= ~NWRITEERR; 541 error = np->n_error; 542 } 543 } 544 return (error); 545} 546 547/* 548 * nfs getattr call from vfs. 549 */ 550static int 551nfs_getattr(struct vop_getattr_args *ap) 552{ 553 struct vnode *vp = ap->a_vp; 554 struct nfsnode *np = VTONFS(vp); 555 u_int32_t *tl; 556 caddr_t bpos, dpos; 557 int error = 0; 558 struct mbuf *mreq, *mrep, *md, *mb; 559 int v3 = NFS_ISV3(vp); 560 561 /* 562 * Update local times for special files. 563 */ 564 if (np->n_flag & (NACC | NUPD)) 565 np->n_flag |= NCHG; 566 /* 567 * First look in the cache. 568 */ 569 if (nfs_getattrcache(vp, ap->a_vap) == 0) 570 return (0); 571 572 if (v3 && nfsaccess_cache_timeout > 0) { 573 nfsstats.accesscache_misses++; 574 nfs3_access_otw(vp, NFSV3ACCESS_ALL, ap->a_td, ap->a_cred); 575 if (nfs_getattrcache(vp, ap->a_vap) == 0) 576 return (0); 577 } 578 579 nfsstats.rpccnt[NFSPROC_GETATTR]++; 580 mreq = nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); 581 mb = mreq; 582 bpos = mtod(mb, caddr_t); 583 nfsm_fhtom(vp, v3); 584 nfsm_request(vp, NFSPROC_GETATTR, ap->a_td, ap->a_cred); 585 if (!error) { 586 nfsm_loadattr(vp, ap->a_vap); 587 } 588 m_freem(mrep); 589nfsmout: 590 return (error); 591} 592 593/* 594 * nfs setattr call. 595 */ 596static int 597nfs_setattr(struct vop_setattr_args *ap) 598{ 599 struct vnode *vp = ap->a_vp; 600 struct nfsnode *np = VTONFS(vp); 601 struct vattr *vap = ap->a_vap; 602 int error = 0; 603 u_quad_t tsize; 604 605#ifndef nolint 606 tsize = (u_quad_t)0; 607#endif 608 609 /* 610 * Setting of flags is not supported. 611 */ 612 if (vap->va_flags != VNOVAL) 613 return (EOPNOTSUPP); 614 615 /* 616 * Disallow write attempts if the filesystem is mounted read-only. 617 */ 618 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 619 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 620 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 621 (vp->v_mount->mnt_flag & MNT_RDONLY)) 622 return (EROFS); 623 if (vap->va_size != VNOVAL) { 624 switch (vp->v_type) { 625 case VDIR: 626 return (EISDIR); 627 case VCHR: 628 case VBLK: 629 case VSOCK: 630 case VFIFO: 631 if (vap->va_mtime.tv_sec == VNOVAL && 632 vap->va_atime.tv_sec == VNOVAL && 633 vap->va_mode == (mode_t)VNOVAL && 634 vap->va_uid == (uid_t)VNOVAL && 635 vap->va_gid == (gid_t)VNOVAL) 636 return (0); 637 vap->va_size = VNOVAL; 638 break; 639 default: 640 /* 641 * Disallow write attempts if the filesystem is 642 * mounted read-only. 643 */ 644 if (vp->v_mount->mnt_flag & MNT_RDONLY) 645 return (EROFS); 646 vnode_pager_setsize(vp, vap->va_size); 647 if (np->n_flag & NMODIFIED) { 648 if (vap->va_size == 0) 649 error = nfs_vinvalbuf(vp, 0, 650 ap->a_cred, ap->a_td, 1); 651 else 652 error = nfs_vinvalbuf(vp, V_SAVE, 653 ap->a_cred, ap->a_td, 1); 654 if (error) { 655 vnode_pager_setsize(vp, np->n_size); 656 return (error); 657 } 658 } 659 tsize = np->n_size; 660 np->n_size = np->n_vattr.va_size = vap->va_size; 661 }; 662 } else if ((vap->va_mtime.tv_sec != VNOVAL || 663 vap->va_atime.tv_sec != VNOVAL) && (np->n_flag & NMODIFIED) && 664 vp->v_type == VREG && 665 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, 666 ap->a_td, 1)) == EINTR) 667 return (error); 668 error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_td); 669 if (error && vap->va_size != VNOVAL) { 670 np->n_size = np->n_vattr.va_size = tsize; 671 vnode_pager_setsize(vp, np->n_size); 672 } 673 return (error); 674} 675 676/* 677 * Do an nfs setattr rpc. 678 */ 679static int 680nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 681 struct thread *td) 682{ 683 struct nfsv2_sattr *sp; 684 caddr_t bpos, dpos; 685 u_int32_t *tl; 686 int error = 0, wccflag = NFSV3_WCCRATTR; 687 struct mbuf *mreq, *mrep, *md, *mb; 688 int v3 = NFS_ISV3(vp); 689 690 nfsstats.rpccnt[NFSPROC_SETATTR]++; 691 mreq = nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 692 mb = mreq; 693 bpos = mtod(mb, caddr_t); 694 nfsm_fhtom(vp, v3); 695 if (v3) { 696 nfsm_v3attrbuild(vap, TRUE); 697 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 698 *tl = nfs_false; 699 } else { 700 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 701 if (vap->va_mode == (mode_t)VNOVAL) 702 sp->sa_mode = nfs_xdrneg1; 703 else 704 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 705 if (vap->va_uid == (uid_t)VNOVAL) 706 sp->sa_uid = nfs_xdrneg1; 707 else 708 sp->sa_uid = txdr_unsigned(vap->va_uid); 709 if (vap->va_gid == (gid_t)VNOVAL) 710 sp->sa_gid = nfs_xdrneg1; 711 else 712 sp->sa_gid = txdr_unsigned(vap->va_gid); 713 sp->sa_size = txdr_unsigned(vap->va_size); 714 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 715 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 716 } 717 nfsm_request(vp, NFSPROC_SETATTR, td, cred); 718 if (v3) { 719 nfsm_wcc_data(vp, wccflag); 720 } else 721 nfsm_loadattr(vp, (struct vattr *)0); 722 m_freem(mrep); 723nfsmout: 724 return (error); 725} 726 727/* 728 * nfs lookup call, one step at a time... 729 * First look in cache 730 * If not found, unlock the directory nfsnode and do the rpc 731 */ 732static int 733nfs_lookup(struct vop_lookup_args *ap) 734{ 735 struct componentname *cnp = ap->a_cnp; 736 struct vnode *dvp = ap->a_dvp; 737 struct vnode **vpp = ap->a_vpp; 738 int flags = cnp->cn_flags; 739 struct vnode *newvp; 740 u_int32_t *tl; 741 struct nfsmount *nmp; 742 caddr_t bpos, dpos; 743 struct mbuf *mreq, *mrep, *md, *mb; 744 long len; 745 nfsfh_t *fhp; 746 struct nfsnode *np; 747 int lockparent, wantparent, error = 0, attrflag, fhsize; 748 int v3 = NFS_ISV3(dvp); 749 struct thread *td = cnp->cn_thread; 750 751 *vpp = NULLVP; 752 cnp->cn_flags &= ~PDIRUNLOCK; 753 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 754 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 755 return (EROFS); 756 if (dvp->v_type != VDIR) 757 return (ENOTDIR); 758 lockparent = flags & LOCKPARENT; 759 wantparent = flags & (LOCKPARENT|WANTPARENT); 760 nmp = VFSTONFS(dvp->v_mount); 761 np = VTONFS(dvp); 762 if ((error = cache_lookup(dvp, vpp, cnp)) && error != ENOENT) { 763 struct vattr vattr; 764 int vpid; 765 766 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) { 767 *vpp = NULLVP; 768 return (error); 769 } 770 771 newvp = *vpp; 772 vpid = newvp->v_id; 773 /* 774 * See the comment starting `Step through' in ufs/ufs_lookup.c 775 * for an explanation of the locking protocol 776 */ 777 if (dvp == newvp) { 778 VREF(newvp); 779 error = 0; 780 } else if (flags & ISDOTDOT) { 781 VOP_UNLOCK(dvp, 0, td); 782 cnp->cn_flags |= PDIRUNLOCK; 783 error = vget(newvp, LK_EXCLUSIVE, td); 784 if (!error && lockparent && (flags & ISLASTCN)) { 785 error = vn_lock(dvp, LK_EXCLUSIVE, td); 786 if (error == 0) 787 cnp->cn_flags &= ~PDIRUNLOCK; 788 } 789 } else { 790 error = vget(newvp, LK_EXCLUSIVE, td); 791 if (!lockparent || error || !(flags & ISLASTCN)) { 792 VOP_UNLOCK(dvp, 0, td); 793 cnp->cn_flags |= PDIRUNLOCK; 794 } 795 } 796 if (!error) { 797 if (vpid == newvp->v_id) { 798 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, td) 799 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 800 nfsstats.lookupcache_hits++; 801 if (cnp->cn_nameiop != LOOKUP && 802 (flags & ISLASTCN)) 803 cnp->cn_flags |= SAVENAME; 804 return (0); 805 } 806 cache_purge(newvp); 807 } 808 vput(newvp); 809 if (lockparent && dvp != newvp && (flags & ISLASTCN)) 810 VOP_UNLOCK(dvp, 0, td); 811 } 812 error = vn_lock(dvp, LK_EXCLUSIVE, td); 813 *vpp = NULLVP; 814 if (error) { 815 cnp->cn_flags |= PDIRUNLOCK; 816 return (error); 817 } 818 cnp->cn_flags &= ~PDIRUNLOCK; 819 } 820 error = 0; 821 newvp = NULLVP; 822 nfsstats.lookupcache_misses++; 823 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 824 len = cnp->cn_namelen; 825 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 826 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 827 mb = mreq; 828 bpos = mtod(mb, caddr_t); 829 nfsm_fhtom(dvp, v3); 830 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 831 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred); 832 if (error) { 833 nfsm_postop_attr(dvp, attrflag); 834 m_freem(mrep); 835 goto nfsmout; 836 } 837 nfsm_getfh(fhp, fhsize, v3); 838 839 /* 840 * Handle RENAME case... 841 */ 842 if (cnp->cn_nameiop == RENAME && wantparent && (flags & ISLASTCN)) { 843 if (NFS_CMPFH(np, fhp, fhsize)) { 844 m_freem(mrep); 845 return (EISDIR); 846 } 847 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 848 if (error) { 849 m_freem(mrep); 850 return (error); 851 } 852 newvp = NFSTOV(np); 853 if (v3) { 854 nfsm_postop_attr(newvp, attrflag); 855 nfsm_postop_attr(dvp, attrflag); 856 } else 857 nfsm_loadattr(newvp, (struct vattr *)0); 858 *vpp = newvp; 859 m_freem(mrep); 860 cnp->cn_flags |= SAVENAME; 861 if (!lockparent) { 862 VOP_UNLOCK(dvp, 0, td); 863 cnp->cn_flags |= PDIRUNLOCK; 864 } 865 return (0); 866 } 867 868 if (flags & ISDOTDOT) { 869 VOP_UNLOCK(dvp, 0, td); 870 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 871 if (error) { 872 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 873 return (error); 874 } 875 newvp = NFSTOV(np); 876 if (lockparent && (flags & ISLASTCN)) { 877 error = vn_lock(dvp, LK_EXCLUSIVE, td); 878 if (error) { 879 cnp->cn_flags |= PDIRUNLOCK; 880 vput(newvp); 881 return (error); 882 } 883 } else 884 cnp->cn_flags |= PDIRUNLOCK; 885 } else if (NFS_CMPFH(np, fhp, fhsize)) { 886 VREF(dvp); 887 newvp = dvp; 888 } else { 889 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 890 if (error) { 891 m_freem(mrep); 892 return (error); 893 } 894 if (!lockparent || !(flags & ISLASTCN)) { 895 cnp->cn_flags |= PDIRUNLOCK; 896 VOP_UNLOCK(dvp, 0, td); 897 } 898 newvp = NFSTOV(np); 899 } 900 if (v3) { 901 nfsm_postop_attr(newvp, attrflag); 902 nfsm_postop_attr(dvp, attrflag); 903 } else 904 nfsm_loadattr(newvp, (struct vattr *)0); 905 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 906 cnp->cn_flags |= SAVENAME; 907 if ((cnp->cn_flags & MAKEENTRY) && 908 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) { 909 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 910 cache_enter(dvp, newvp, cnp); 911 } 912 *vpp = newvp; 913 m_freem(mrep); 914nfsmout: 915 if (error) { 916 if (newvp != NULLVP) { 917 vrele(newvp); 918 *vpp = NULLVP; 919 } 920 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 921 (flags & ISLASTCN) && error == ENOENT) { 922 if (!lockparent) { 923 VOP_UNLOCK(dvp, 0, td); 924 cnp->cn_flags |= PDIRUNLOCK; 925 } 926 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 927 error = EROFS; 928 else 929 error = EJUSTRETURN; 930 } 931 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 932 cnp->cn_flags |= SAVENAME; 933 } 934 return (error); 935} 936 937/* 938 * nfs read call. 939 * Just call nfs_bioread() to do the work. 940 */ 941static int 942nfs_read(struct vop_read_args *ap) 943{ 944 struct vnode *vp = ap->a_vp; 945 946 if (vp->v_type != VREG) 947 return (EPERM); 948 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 949} 950 951/* 952 * nfs readlink call 953 */ 954static int 955nfs_readlink(struct vop_readlink_args *ap) 956{ 957 struct vnode *vp = ap->a_vp; 958 959 if (vp->v_type != VLNK) 960 return (EINVAL); 961 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred)); 962} 963 964/* 965 * Do a readlink rpc. 966 * Called by nfs_doio() from below the buffer cache. 967 */ 968int 969nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 970{ 971 u_int32_t *tl; 972 caddr_t bpos, dpos; 973 int error = 0, len, attrflag; 974 struct mbuf *mreq, *mrep, *md, *mb; 975 int v3 = NFS_ISV3(vp); 976 977 nfsstats.rpccnt[NFSPROC_READLINK]++; 978 mreq = nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 979 mb = mreq; 980 bpos = mtod(mb, caddr_t); 981 nfsm_fhtom(vp, v3); 982 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred); 983 if (v3) 984 nfsm_postop_attr(vp, attrflag); 985 if (!error) { 986 nfsm_strsiz(len, NFS_MAXPATHLEN); 987 if (len == NFS_MAXPATHLEN) { 988 struct nfsnode *np = VTONFS(vp); 989 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 990 len = np->n_size; 991 } 992 nfsm_mtouio(uiop, len); 993 } 994 m_freem(mrep); 995nfsmout: 996 return (error); 997} 998 999/* 1000 * nfs read rpc call 1001 * Ditto above 1002 */ 1003int 1004nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1005{ 1006 u_int32_t *tl; 1007 caddr_t bpos, dpos; 1008 struct mbuf *mreq, *mrep, *md, *mb; 1009 struct nfsmount *nmp; 1010 int error = 0, len, retlen, tsiz, eof, attrflag; 1011 int v3 = NFS_ISV3(vp); 1012 1013#ifndef nolint 1014 eof = 0; 1015#endif 1016 nmp = VFSTONFS(vp->v_mount); 1017 tsiz = uiop->uio_resid; 1018 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1019 return (EFBIG); 1020 while (tsiz > 0) { 1021 nfsstats.rpccnt[NFSPROC_READ]++; 1022 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1023 mreq = nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1024 mb = mreq; 1025 bpos = mtod(mb, caddr_t); 1026 nfsm_fhtom(vp, v3); 1027 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3); 1028 if (v3) { 1029 txdr_hyper(uiop->uio_offset, tl); 1030 *(tl + 2) = txdr_unsigned(len); 1031 } else { 1032 *tl++ = txdr_unsigned(uiop->uio_offset); 1033 *tl++ = txdr_unsigned(len); 1034 *tl = 0; 1035 } 1036 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred); 1037 if (v3) { 1038 nfsm_postop_attr(vp, attrflag); 1039 if (error) { 1040 m_freem(mrep); 1041 goto nfsmout; 1042 } 1043 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED); 1044 eof = fxdr_unsigned(int, *(tl + 1)); 1045 } else 1046 nfsm_loadattr(vp, (struct vattr *)0); 1047 nfsm_strsiz(retlen, nmp->nm_rsize); 1048 nfsm_mtouio(uiop, retlen); 1049 m_freem(mrep); 1050 tsiz -= retlen; 1051 if (v3) { 1052 if (eof || retlen == 0) 1053 tsiz = 0; 1054 } else if (retlen < len) 1055 tsiz = 0; 1056 } 1057nfsmout: 1058 return (error); 1059} 1060 1061/* 1062 * nfs write call 1063 */ 1064int 1065nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1066 int *iomode, int *must_commit) 1067{ 1068 u_int32_t *tl; 1069 int32_t backup; 1070 caddr_t bpos, dpos; 1071 struct mbuf *mreq, *mrep, *md, *mb; 1072 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1073 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1074 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1075 1076#ifndef DIAGNOSTIC 1077 if (uiop->uio_iovcnt != 1) 1078 panic("nfs: writerpc iovcnt > 1"); 1079#endif 1080 *must_commit = 0; 1081 tsiz = uiop->uio_resid; 1082 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1083 return (EFBIG); 1084 while (tsiz > 0) { 1085 nfsstats.rpccnt[NFSPROC_WRITE]++; 1086 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 1087 mreq = nfsm_reqhead(vp, NFSPROC_WRITE, 1088 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1089 mb = mreq; 1090 bpos = mtod(mb, caddr_t); 1091 nfsm_fhtom(vp, v3); 1092 if (v3) { 1093 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 1094 txdr_hyper(uiop->uio_offset, tl); 1095 tl += 2; 1096 *tl++ = txdr_unsigned(len); 1097 *tl++ = txdr_unsigned(*iomode); 1098 *tl = txdr_unsigned(len); 1099 } else { 1100 u_int32_t x; 1101 1102 tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED); 1103 /* Set both "begin" and "current" to non-garbage. */ 1104 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1105 *tl++ = x; /* "begin offset" */ 1106 *tl++ = x; /* "current offset" */ 1107 x = txdr_unsigned(len); 1108 *tl++ = x; /* total to this offset */ 1109 *tl = x; /* size of this write */ 1110 } 1111 nfsm_uiotom(uiop, len); 1112 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred); 1113 if (v3) { 1114 wccflag = NFSV3_WCCCHK; 1115 nfsm_wcc_data(vp, wccflag); 1116 if (!error) { 1117 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED 1118 + NFSX_V3WRITEVERF); 1119 rlen = fxdr_unsigned(int, *tl++); 1120 if (rlen == 0) { 1121 error = NFSERR_IO; 1122 m_freem(mrep); 1123 break; 1124 } else if (rlen < len) { 1125 backup = len - rlen; 1126 uiop->uio_iov->iov_base -= backup; 1127 uiop->uio_iov->iov_len += backup; 1128 uiop->uio_offset -= backup; 1129 uiop->uio_resid += backup; 1130 len = rlen; 1131 } 1132 commit = fxdr_unsigned(int, *tl++); 1133 1134 /* 1135 * Return the lowest committment level 1136 * obtained by any of the RPCs. 1137 */ 1138 if (committed == NFSV3WRITE_FILESYNC) 1139 committed = commit; 1140 else if (committed == NFSV3WRITE_DATASYNC && 1141 commit == NFSV3WRITE_UNSTABLE) 1142 committed = commit; 1143 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1144 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1145 NFSX_V3WRITEVERF); 1146 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1147 } else if (bcmp((caddr_t)tl, 1148 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1149 *must_commit = 1; 1150 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1151 NFSX_V3WRITEVERF); 1152 } 1153 } 1154 } else 1155 nfsm_loadattr(vp, (struct vattr *)0); 1156 if (wccflag) 1157 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime.tv_sec; 1158 m_freem(mrep); 1159 if (error) 1160 break; 1161 tsiz -= len; 1162 } 1163nfsmout: 1164 if (vp->v_mount->mnt_flag & MNT_ASYNC) 1165 committed = NFSV3WRITE_FILESYNC; 1166 *iomode = committed; 1167 if (error) 1168 uiop->uio_resid = tsiz; 1169 return (error); 1170} 1171 1172/* 1173 * nfs mknod rpc 1174 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1175 * mode set to specify the file type and the size field for rdev. 1176 */ 1177static int 1178nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1179 struct vattr *vap) 1180{ 1181 struct nfsv2_sattr *sp; 1182 u_int32_t *tl; 1183 struct vnode *newvp = (struct vnode *)0; 1184 struct nfsnode *np = (struct nfsnode *)0; 1185 struct vattr vattr; 1186 caddr_t bpos, dpos; 1187 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1188 struct mbuf *mreq, *mrep, *md, *mb; 1189 u_int32_t rdev; 1190 int v3 = NFS_ISV3(dvp); 1191 1192 if (vap->va_type == VCHR || vap->va_type == VBLK) 1193 rdev = txdr_unsigned(vap->va_rdev); 1194 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1195 rdev = nfs_xdrneg1; 1196 else { 1197 return (EOPNOTSUPP); 1198 } 1199 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1200 return (error); 1201 } 1202 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1203 mreq = nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1204 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1205 mb = mreq; 1206 bpos = mtod(mb, caddr_t); 1207 nfsm_fhtom(dvp, v3); 1208 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1209 if (v3) { 1210 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1211 *tl++ = vtonfsv3_type(vap->va_type); 1212 nfsm_v3attrbuild(vap, FALSE); 1213 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1214 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 1215 *tl++ = txdr_unsigned(umajor(vap->va_rdev)); 1216 *tl = txdr_unsigned(uminor(vap->va_rdev)); 1217 } 1218 } else { 1219 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1220 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1221 sp->sa_uid = nfs_xdrneg1; 1222 sp->sa_gid = nfs_xdrneg1; 1223 sp->sa_size = rdev; 1224 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1225 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1226 } 1227 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred); 1228 if (!error) { 1229 nfsm_mtofh(dvp, newvp, v3, gotvp); 1230 if (!gotvp) { 1231 if (newvp) { 1232 vput(newvp); 1233 newvp = (struct vnode *)0; 1234 } 1235 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1236 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1237 if (!error) 1238 newvp = NFSTOV(np); 1239 } 1240 } 1241 if (v3) 1242 nfsm_wcc_data(dvp, wccflag); 1243 m_freem(mrep); 1244nfsmout: 1245 if (error) { 1246 if (newvp) 1247 vput(newvp); 1248 } else { 1249 if (cnp->cn_flags & MAKEENTRY) 1250 cache_enter(dvp, newvp, cnp); 1251 *vpp = newvp; 1252 } 1253 VTONFS(dvp)->n_flag |= NMODIFIED; 1254 if (!wccflag) 1255 VTONFS(dvp)->n_attrstamp = 0; 1256 return (error); 1257} 1258 1259/* 1260 * nfs mknod vop 1261 * just call nfs_mknodrpc() to do the work. 1262 */ 1263/* ARGSUSED */ 1264static int 1265nfs_mknod(struct vop_mknod_args *ap) 1266{ 1267 1268 return nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap); 1269} 1270 1271static u_long create_verf; 1272/* 1273 * nfs file create call 1274 */ 1275static int 1276nfs_create(struct vop_create_args *ap) 1277{ 1278 struct vnode *dvp = ap->a_dvp; 1279 struct vattr *vap = ap->a_vap; 1280 struct componentname *cnp = ap->a_cnp; 1281 struct nfsv2_sattr *sp; 1282 u_int32_t *tl; 1283 struct nfsnode *np = (struct nfsnode *)0; 1284 struct vnode *newvp = (struct vnode *)0; 1285 caddr_t bpos, dpos; 1286 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1287 struct mbuf *mreq, *mrep, *md, *mb; 1288 struct vattr vattr; 1289 int v3 = NFS_ISV3(dvp); 1290 1291 /* 1292 * Oops, not for me.. 1293 */ 1294 if (vap->va_type == VSOCK) 1295 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1296 1297 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1298 return (error); 1299 } 1300 if (vap->va_vaflags & VA_EXCLUSIVE) 1301 fmode |= O_EXCL; 1302again: 1303 nfsstats.rpccnt[NFSPROC_CREATE]++; 1304 mreq = nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1305 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1306 mb = mreq; 1307 bpos = mtod(mb, caddr_t); 1308 nfsm_fhtom(dvp, v3); 1309 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1310 if (v3) { 1311 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1312 if (fmode & O_EXCL) { 1313 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1314 tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF); 1315#ifdef INET 1316 if (!TAILQ_EMPTY(&in_ifaddrhead)) 1317 *tl++ = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr.s_addr; 1318 else 1319#endif 1320 *tl++ = create_verf; 1321 *tl = ++create_verf; 1322 } else { 1323 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1324 nfsm_v3attrbuild(vap, FALSE); 1325 } 1326 } else { 1327 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1328 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1329 sp->sa_uid = nfs_xdrneg1; 1330 sp->sa_gid = nfs_xdrneg1; 1331 sp->sa_size = 0; 1332 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1333 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1334 } 1335 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred); 1336 if (!error) { 1337 nfsm_mtofh(dvp, newvp, v3, gotvp); 1338 if (!gotvp) { 1339 if (newvp) { 1340 vput(newvp); 1341 newvp = (struct vnode *)0; 1342 } 1343 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1344 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1345 if (!error) 1346 newvp = NFSTOV(np); 1347 } 1348 } 1349 if (v3) 1350 nfsm_wcc_data(dvp, wccflag); 1351 m_freem(mrep); 1352nfsmout: 1353 if (error) { 1354 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1355 fmode &= ~O_EXCL; 1356 goto again; 1357 } 1358 if (newvp) 1359 vput(newvp); 1360 } else if (v3 && (fmode & O_EXCL)) { 1361 /* 1362 * We are normally called with only a partially initialized 1363 * VAP. Since the NFSv3 spec says that server may use the 1364 * file attributes to store the verifier, the spec requires 1365 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1366 * in atime, but we can't really assume that all servers will 1367 * so we ensure that our SETATTR sets both atime and mtime. 1368 */ 1369 if (vap->va_mtime.tv_sec == VNOVAL) 1370 vfs_timestamp(&vap->va_mtime); 1371 if (vap->va_atime.tv_sec == VNOVAL) 1372 vap->va_atime = vap->va_mtime; 1373 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_thread); 1374 } 1375 if (!error) { 1376 if (cnp->cn_flags & MAKEENTRY) 1377 cache_enter(dvp, newvp, cnp); 1378 *ap->a_vpp = newvp; 1379 } 1380 VTONFS(dvp)->n_flag |= NMODIFIED; 1381 if (!wccflag) 1382 VTONFS(dvp)->n_attrstamp = 0; 1383 return (error); 1384} 1385 1386/* 1387 * nfs file remove call 1388 * To try and make nfs semantics closer to ufs semantics, a file that has 1389 * other processes using the vnode is renamed instead of removed and then 1390 * removed later on the last close. 1391 * - If v_usecount > 1 1392 * If a rename is not already in the works 1393 * call nfs_sillyrename() to set it up 1394 * else 1395 * do the remove rpc 1396 */ 1397static int 1398nfs_remove(struct vop_remove_args *ap) 1399{ 1400 struct vnode *vp = ap->a_vp; 1401 struct vnode *dvp = ap->a_dvp; 1402 struct componentname *cnp = ap->a_cnp; 1403 struct nfsnode *np = VTONFS(vp); 1404 int error = 0; 1405 struct vattr vattr; 1406 1407#ifndef DIAGNOSTIC 1408 if ((cnp->cn_flags & HASBUF) == 0) 1409 panic("nfs_remove: no name"); 1410 if (vp->v_usecount < 1) 1411 panic("nfs_remove: bad v_usecount"); 1412#endif 1413 if (vp->v_type == VDIR) 1414 error = EPERM; 1415 else if (vp->v_usecount == 1 || (np->n_sillyrename && 1416 VOP_GETATTR(vp, &vattr, cnp->cn_cred, cnp->cn_thread) == 0 && 1417 vattr.va_nlink > 1)) { 1418 /* 1419 * Purge the name cache so that the chance of a lookup for 1420 * the name succeeding while the remove is in progress is 1421 * minimized. Without node locking it can still happen, such 1422 * that an I/O op returns ESTALE, but since you get this if 1423 * another host removes the file.. 1424 */ 1425 cache_purge(vp); 1426 /* 1427 * throw away biocache buffers, mainly to avoid 1428 * unnecessary delayed writes later. 1429 */ 1430 error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, cnp->cn_thread, 1); 1431 /* Do the rpc */ 1432 if (error != EINTR) 1433 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1434 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1435 /* 1436 * Kludge City: If the first reply to the remove rpc is lost.. 1437 * the reply to the retransmitted request will be ENOENT 1438 * since the file was in fact removed 1439 * Therefore, we cheat and return success. 1440 */ 1441 if (error == ENOENT) 1442 error = 0; 1443 } else if (!np->n_sillyrename) 1444 error = nfs_sillyrename(dvp, vp, cnp); 1445 np->n_attrstamp = 0; 1446 return (error); 1447} 1448 1449/* 1450 * nfs file remove rpc called from nfs_inactive 1451 */ 1452int 1453nfs_removeit(struct sillyrename *sp) 1454{ 1455 1456 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1457 (struct thread *)0)); 1458} 1459 1460/* 1461 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1462 */ 1463static int 1464nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1465 struct ucred *cred, struct thread *td) 1466{ 1467 u_int32_t *tl; 1468 caddr_t bpos, dpos; 1469 int error = 0, wccflag = NFSV3_WCCRATTR; 1470 struct mbuf *mreq, *mrep, *md, *mb; 1471 int v3 = NFS_ISV3(dvp); 1472 1473 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1474 mreq = nfsm_reqhead(dvp, NFSPROC_REMOVE, 1475 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1476 mb = mreq; 1477 bpos = mtod(mb, caddr_t); 1478 nfsm_fhtom(dvp, v3); 1479 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1480 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1481 if (v3) 1482 nfsm_wcc_data(dvp, wccflag); 1483 m_freem(mrep); 1484nfsmout: 1485 VTONFS(dvp)->n_flag |= NMODIFIED; 1486 if (!wccflag) 1487 VTONFS(dvp)->n_attrstamp = 0; 1488 return (error); 1489} 1490 1491/* 1492 * nfs file rename call 1493 */ 1494static int 1495nfs_rename(struct vop_rename_args *ap) 1496{ 1497 struct vnode *fvp = ap->a_fvp; 1498 struct vnode *tvp = ap->a_tvp; 1499 struct vnode *fdvp = ap->a_fdvp; 1500 struct vnode *tdvp = ap->a_tdvp; 1501 struct componentname *tcnp = ap->a_tcnp; 1502 struct componentname *fcnp = ap->a_fcnp; 1503 int error; 1504 1505#ifndef DIAGNOSTIC 1506 if ((tcnp->cn_flags & HASBUF) == 0 || 1507 (fcnp->cn_flags & HASBUF) == 0) 1508 panic("nfs_rename: no name"); 1509#endif 1510 /* Check for cross-device rename */ 1511 if ((fvp->v_mount != tdvp->v_mount) || 1512 (tvp && (fvp->v_mount != tvp->v_mount))) { 1513 error = EXDEV; 1514 goto out; 1515 } 1516 1517 /* 1518 * We have to flush B_DELWRI data prior to renaming 1519 * the file. If we don't, the delayed-write buffers 1520 * can be flushed out later after the file has gone stale 1521 * under NFSV3. NFSV2 does not have this problem because 1522 * ( as far as I can tell ) it flushes dirty buffers more 1523 * often. 1524 */ 1525 1526 VOP_FSYNC(fvp, fcnp->cn_cred, MNT_WAIT, fcnp->cn_thread); 1527 if (tvp) 1528 VOP_FSYNC(tvp, tcnp->cn_cred, MNT_WAIT, tcnp->cn_thread); 1529 1530 /* 1531 * If the tvp exists and is in use, sillyrename it before doing the 1532 * rename of the new file over it. 1533 * XXX Can't sillyrename a directory. 1534 */ 1535 if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename && 1536 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1537 vput(tvp); 1538 tvp = NULL; 1539 } 1540 1541 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1542 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1543 tcnp->cn_thread); 1544 1545 if (fvp->v_type == VDIR) { 1546 if (tvp != NULL && tvp->v_type == VDIR) 1547 cache_purge(tdvp); 1548 cache_purge(fdvp); 1549 } 1550 1551out: 1552 if (tdvp == tvp) 1553 vrele(tdvp); 1554 else 1555 vput(tdvp); 1556 if (tvp) 1557 vput(tvp); 1558 vrele(fdvp); 1559 vrele(fvp); 1560 /* 1561 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1562 */ 1563 if (error == ENOENT) 1564 error = 0; 1565 return (error); 1566} 1567 1568/* 1569 * nfs file rename rpc called from nfs_remove() above 1570 */ 1571static int 1572nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 1573 struct sillyrename *sp) 1574{ 1575 1576 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp, 1577 sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread)); 1578} 1579 1580/* 1581 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1582 */ 1583static int 1584nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 1585 struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred, 1586 struct thread *td) 1587{ 1588 u_int32_t *tl; 1589 caddr_t bpos, dpos; 1590 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1591 struct mbuf *mreq, *mrep, *md, *mb; 1592 int v3 = NFS_ISV3(fdvp); 1593 1594 nfsstats.rpccnt[NFSPROC_RENAME]++; 1595 mreq = nfsm_reqhead(fdvp, NFSPROC_RENAME, 1596 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1597 nfsm_rndup(tnamelen)); 1598 mb = mreq; 1599 bpos = mtod(mb, caddr_t); 1600 nfsm_fhtom(fdvp, v3); 1601 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1602 nfsm_fhtom(tdvp, v3); 1603 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1604 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1605 if (v3) { 1606 nfsm_wcc_data(fdvp, fwccflag); 1607 nfsm_wcc_data(tdvp, twccflag); 1608 } 1609 m_freem(mrep); 1610nfsmout: 1611 VTONFS(fdvp)->n_flag |= NMODIFIED; 1612 VTONFS(tdvp)->n_flag |= NMODIFIED; 1613 if (!fwccflag) 1614 VTONFS(fdvp)->n_attrstamp = 0; 1615 if (!twccflag) 1616 VTONFS(tdvp)->n_attrstamp = 0; 1617 return (error); 1618} 1619 1620/* 1621 * nfs hard link create call 1622 */ 1623static int 1624nfs_link(struct vop_link_args *ap) 1625{ 1626 struct vnode *vp = ap->a_vp; 1627 struct vnode *tdvp = ap->a_tdvp; 1628 struct componentname *cnp = ap->a_cnp; 1629 u_int32_t *tl; 1630 caddr_t bpos, dpos; 1631 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1632 struct mbuf *mreq, *mrep, *md, *mb; 1633 int v3; 1634 1635 if (vp->v_mount != tdvp->v_mount) { 1636 return (EXDEV); 1637 } 1638 1639 /* 1640 * Push all writes to the server, so that the attribute cache 1641 * doesn't get "out of sync" with the server. 1642 * XXX There should be a better way! 1643 */ 1644 VOP_FSYNC(vp, cnp->cn_cred, MNT_WAIT, cnp->cn_thread); 1645 1646 v3 = NFS_ISV3(vp); 1647 nfsstats.rpccnt[NFSPROC_LINK]++; 1648 mreq = nfsm_reqhead(vp, NFSPROC_LINK, 1649 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1650 mb = mreq; 1651 bpos = mtod(mb, caddr_t); 1652 nfsm_fhtom(vp, v3); 1653 nfsm_fhtom(tdvp, v3); 1654 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1655 nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred); 1656 if (v3) { 1657 nfsm_postop_attr(vp, attrflag); 1658 nfsm_wcc_data(tdvp, wccflag); 1659 } 1660 m_freem(mrep); 1661nfsmout: 1662 VTONFS(tdvp)->n_flag |= NMODIFIED; 1663 if (!attrflag) 1664 VTONFS(vp)->n_attrstamp = 0; 1665 if (!wccflag) 1666 VTONFS(tdvp)->n_attrstamp = 0; 1667 /* 1668 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 1669 */ 1670 if (error == EEXIST) 1671 error = 0; 1672 return (error); 1673} 1674 1675/* 1676 * nfs symbolic link create call 1677 */ 1678static int 1679nfs_symlink(struct vop_symlink_args *ap) 1680{ 1681 struct vnode *dvp = ap->a_dvp; 1682 struct vattr *vap = ap->a_vap; 1683 struct componentname *cnp = ap->a_cnp; 1684 struct nfsv2_sattr *sp; 1685 u_int32_t *tl; 1686 caddr_t bpos, dpos; 1687 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 1688 struct mbuf *mreq, *mrep, *md, *mb; 1689 struct vnode *newvp = (struct vnode *)0; 1690 int v3 = NFS_ISV3(dvp); 1691 1692 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 1693 slen = strlen(ap->a_target); 1694 mreq = nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 1695 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 1696 mb = mreq; 1697 bpos = mtod(mb, caddr_t); 1698 nfsm_fhtom(dvp, v3); 1699 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1700 if (v3) { 1701 nfsm_v3attrbuild(vap, FALSE); 1702 } 1703 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 1704 if (!v3) { 1705 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1706 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 1707 sp->sa_uid = nfs_xdrneg1; 1708 sp->sa_gid = nfs_xdrneg1; 1709 sp->sa_size = nfs_xdrneg1; 1710 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1711 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1712 } 1713 1714 /* 1715 * Issue the NFS request and get the rpc response. 1716 * 1717 * Only NFSv3 responses returning an error of 0 actually return 1718 * a file handle that can be converted into newvp without having 1719 * to do an extra lookup rpc. 1720 */ 1721 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred); 1722 if (v3) { 1723 if (error == 0) 1724 nfsm_mtofh(dvp, newvp, v3, gotvp); 1725 nfsm_wcc_data(dvp, wccflag); 1726 } 1727 1728 /* 1729 * out code jumps -> here, mrep is also freed. 1730 */ 1731 1732 m_freem(mrep); 1733nfsmout: 1734 1735 /* 1736 * If we get an EEXIST error, silently convert it to no-error 1737 * in case of an NFS retry. 1738 */ 1739 if (error == EEXIST) 1740 error = 0; 1741 1742 /* 1743 * If we do not have (or no longer have) an error, and we could 1744 * not extract the newvp from the response due to the request being 1745 * NFSv2 or the error being EEXIST. We have to do a lookup in order 1746 * to obtain a newvp to return. 1747 */ 1748 if (error == 0 && newvp == NULL) { 1749 struct nfsnode *np = NULL; 1750 1751 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1752 cnp->cn_cred, cnp->cn_thread, &np); 1753 if (!error) 1754 newvp = NFSTOV(np); 1755 } 1756 if (error) { 1757 if (newvp) 1758 vput(newvp); 1759 } else { 1760 *ap->a_vpp = newvp; 1761 } 1762 VTONFS(dvp)->n_flag |= NMODIFIED; 1763 if (!wccflag) 1764 VTONFS(dvp)->n_attrstamp = 0; 1765 return (error); 1766} 1767 1768/* 1769 * nfs make dir call 1770 */ 1771static int 1772nfs_mkdir(struct vop_mkdir_args *ap) 1773{ 1774 struct vnode *dvp = ap->a_dvp; 1775 struct vattr *vap = ap->a_vap; 1776 struct componentname *cnp = ap->a_cnp; 1777 struct nfsv2_sattr *sp; 1778 u_int32_t *tl; 1779 int len; 1780 struct nfsnode *np = (struct nfsnode *)0; 1781 struct vnode *newvp = (struct vnode *)0; 1782 caddr_t bpos, dpos; 1783 int error = 0, wccflag = NFSV3_WCCRATTR; 1784 int gotvp = 0; 1785 struct mbuf *mreq, *mrep, *md, *mb; 1786 struct vattr vattr; 1787 int v3 = NFS_ISV3(dvp); 1788 1789 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1790 return (error); 1791 } 1792 len = cnp->cn_namelen; 1793 nfsstats.rpccnt[NFSPROC_MKDIR]++; 1794 mreq = nfsm_reqhead(dvp, NFSPROC_MKDIR, 1795 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 1796 mb = mreq; 1797 bpos = mtod(mb, caddr_t); 1798 nfsm_fhtom(dvp, v3); 1799 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1800 if (v3) { 1801 nfsm_v3attrbuild(vap, FALSE); 1802 } else { 1803 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1804 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 1805 sp->sa_uid = nfs_xdrneg1; 1806 sp->sa_gid = nfs_xdrneg1; 1807 sp->sa_size = nfs_xdrneg1; 1808 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1809 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1810 } 1811 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred); 1812 if (!error) 1813 nfsm_mtofh(dvp, newvp, v3, gotvp); 1814 if (v3) 1815 nfsm_wcc_data(dvp, wccflag); 1816 m_freem(mrep); 1817nfsmout: 1818 VTONFS(dvp)->n_flag |= NMODIFIED; 1819 if (!wccflag) 1820 VTONFS(dvp)->n_attrstamp = 0; 1821 /* 1822 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 1823 * if we can succeed in looking up the directory. 1824 */ 1825 if (error == EEXIST || (!error && !gotvp)) { 1826 if (newvp) { 1827 vrele(newvp); 1828 newvp = (struct vnode *)0; 1829 } 1830 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 1831 cnp->cn_thread, &np); 1832 if (!error) { 1833 newvp = NFSTOV(np); 1834 if (newvp->v_type != VDIR) 1835 error = EEXIST; 1836 } 1837 } 1838 if (error) { 1839 if (newvp) 1840 vrele(newvp); 1841 } else 1842 *ap->a_vpp = newvp; 1843 return (error); 1844} 1845 1846/* 1847 * nfs remove directory call 1848 */ 1849static int 1850nfs_rmdir(struct vop_rmdir_args *ap) 1851{ 1852 struct vnode *vp = ap->a_vp; 1853 struct vnode *dvp = ap->a_dvp; 1854 struct componentname *cnp = ap->a_cnp; 1855 u_int32_t *tl; 1856 caddr_t bpos, dpos; 1857 int error = 0, wccflag = NFSV3_WCCRATTR; 1858 struct mbuf *mreq, *mrep, *md, *mb; 1859 int v3 = NFS_ISV3(dvp); 1860 1861 if (dvp == vp) 1862 return (EINVAL); 1863 nfsstats.rpccnt[NFSPROC_RMDIR]++; 1864 mreq = nfsm_reqhead(dvp, NFSPROC_RMDIR, 1865 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1866 mb = mreq; 1867 bpos = mtod(mb, caddr_t); 1868 nfsm_fhtom(dvp, v3); 1869 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1870 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred); 1871 if (v3) 1872 nfsm_wcc_data(dvp, wccflag); 1873 m_freem(mrep); 1874nfsmout: 1875 VTONFS(dvp)->n_flag |= NMODIFIED; 1876 if (!wccflag) 1877 VTONFS(dvp)->n_attrstamp = 0; 1878 cache_purge(dvp); 1879 cache_purge(vp); 1880 /* 1881 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 1882 */ 1883 if (error == ENOENT) 1884 error = 0; 1885 return (error); 1886} 1887 1888/* 1889 * nfs readdir call 1890 */ 1891static int 1892nfs_readdir(struct vop_readdir_args *ap) 1893{ 1894 struct vnode *vp = ap->a_vp; 1895 struct nfsnode *np = VTONFS(vp); 1896 struct uio *uio = ap->a_uio; 1897 int tresid, error; 1898 struct vattr vattr; 1899 1900 if (vp->v_type != VDIR) 1901 return (EPERM); 1902 /* 1903 * First, check for hit on the EOF offset cache 1904 */ 1905 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 1906 (np->n_flag & NMODIFIED) == 0) { 1907 if (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_td) == 0 && 1908 np->n_mtime == vattr.va_mtime.tv_sec) { 1909 nfsstats.direofcache_hits++; 1910 return (0); 1911 } 1912 } 1913 1914 /* 1915 * Call nfs_bioread() to do the real work. 1916 */ 1917 tresid = uio->uio_resid; 1918 error = nfs_bioread(vp, uio, 0, ap->a_cred); 1919 1920 if (!error && uio->uio_resid == tresid) 1921 nfsstats.direofcache_misses++; 1922 return (error); 1923} 1924 1925/* 1926 * Readdir rpc call. 1927 * Called from below the buffer cache by nfs_doio(). 1928 */ 1929int 1930nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1931{ 1932 int len, left; 1933 struct dirent *dp = NULL; 1934 u_int32_t *tl; 1935 caddr_t cp; 1936 nfsuint64 *cookiep; 1937 caddr_t bpos, dpos; 1938 struct mbuf *mreq, *mrep, *md, *mb; 1939 nfsuint64 cookie; 1940 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1941 struct nfsnode *dnp = VTONFS(vp); 1942 u_quad_t fileno; 1943 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 1944 int attrflag; 1945 int v3 = NFS_ISV3(vp); 1946 1947#ifndef DIAGNOSTIC 1948 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 1949 (uiop->uio_resid & (DIRBLKSIZ - 1))) 1950 panic("nfs readdirrpc bad uio"); 1951#endif 1952 1953 /* 1954 * If there is no cookie, assume directory was stale. 1955 */ 1956 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 1957 if (cookiep) 1958 cookie = *cookiep; 1959 else 1960 return (NFSERR_BAD_COOKIE); 1961 /* 1962 * Loop around doing readdir rpc's of size nm_readdirsize 1963 * truncated to a multiple of DIRBLKSIZ. 1964 * The stopping criteria is EOF or buffer full. 1965 */ 1966 while (more_dirs && bigenough) { 1967 nfsstats.rpccnt[NFSPROC_READDIR]++; 1968 mreq = nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 1969 NFSX_READDIR(v3)); 1970 mb = mreq; 1971 bpos = mtod(mb, caddr_t); 1972 nfsm_fhtom(vp, v3); 1973 if (v3) { 1974 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 1975 *tl++ = cookie.nfsuquad[0]; 1976 *tl++ = cookie.nfsuquad[1]; 1977 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 1978 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 1979 } else { 1980 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 1981 *tl++ = cookie.nfsuquad[0]; 1982 } 1983 *tl = txdr_unsigned(nmp->nm_readdirsize); 1984 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred); 1985 if (v3) { 1986 nfsm_postop_attr(vp, attrflag); 1987 if (!error) { 1988 tl = nfsm_dissect(u_int32_t *, 1989 2 * NFSX_UNSIGNED); 1990 dnp->n_cookieverf.nfsuquad[0] = *tl++; 1991 dnp->n_cookieverf.nfsuquad[1] = *tl; 1992 } else { 1993 m_freem(mrep); 1994 goto nfsmout; 1995 } 1996 } 1997 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 1998 more_dirs = fxdr_unsigned(int, *tl); 1999 2000 /* loop thru the dir entries, doctoring them to 4bsd form */ 2001 while (more_dirs && bigenough) { 2002 if (v3) { 2003 tl = nfsm_dissect(u_int32_t *, 2004 3 * NFSX_UNSIGNED); 2005 fileno = fxdr_hyper(tl); 2006 len = fxdr_unsigned(int, *(tl + 2)); 2007 } else { 2008 tl = nfsm_dissect(u_int32_t *, 2009 2 * NFSX_UNSIGNED); 2010 fileno = fxdr_unsigned(u_quad_t, *tl++); 2011 len = fxdr_unsigned(int, *tl); 2012 } 2013 if (len <= 0 || len > NFS_MAXNAMLEN) { 2014 error = EBADRPC; 2015 m_freem(mrep); 2016 goto nfsmout; 2017 } 2018 tlen = nfsm_rndup(len); 2019 if (tlen == len) 2020 tlen += 4; /* To ensure null termination */ 2021 left = DIRBLKSIZ - blksiz; 2022 if ((tlen + DIRHDSIZ) > left) { 2023 dp->d_reclen += left; 2024 uiop->uio_iov->iov_base += left; 2025 uiop->uio_iov->iov_len -= left; 2026 uiop->uio_offset += left; 2027 uiop->uio_resid -= left; 2028 blksiz = 0; 2029 } 2030 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2031 bigenough = 0; 2032 if (bigenough) { 2033 dp = (struct dirent *)uiop->uio_iov->iov_base; 2034 dp->d_fileno = (int)fileno; 2035 dp->d_namlen = len; 2036 dp->d_reclen = tlen + DIRHDSIZ; 2037 dp->d_type = DT_UNKNOWN; 2038 blksiz += dp->d_reclen; 2039 if (blksiz == DIRBLKSIZ) 2040 blksiz = 0; 2041 uiop->uio_offset += DIRHDSIZ; 2042 uiop->uio_resid -= DIRHDSIZ; 2043 uiop->uio_iov->iov_base += DIRHDSIZ; 2044 uiop->uio_iov->iov_len -= DIRHDSIZ; 2045 nfsm_mtouio(uiop, len); 2046 cp = uiop->uio_iov->iov_base; 2047 tlen -= len; 2048 *cp = '\0'; /* null terminate */ 2049 uiop->uio_iov->iov_base += tlen; 2050 uiop->uio_iov->iov_len -= tlen; 2051 uiop->uio_offset += tlen; 2052 uiop->uio_resid -= tlen; 2053 } else 2054 nfsm_adv(nfsm_rndup(len)); 2055 if (v3) { 2056 tl = nfsm_dissect(u_int32_t *, 2057 3 * NFSX_UNSIGNED); 2058 } else { 2059 tl = nfsm_dissect(u_int32_t *, 2060 2 * NFSX_UNSIGNED); 2061 } 2062 if (bigenough) { 2063 cookie.nfsuquad[0] = *tl++; 2064 if (v3) 2065 cookie.nfsuquad[1] = *tl++; 2066 } else if (v3) 2067 tl += 2; 2068 else 2069 tl++; 2070 more_dirs = fxdr_unsigned(int, *tl); 2071 } 2072 /* 2073 * If at end of rpc data, get the eof boolean 2074 */ 2075 if (!more_dirs) { 2076 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2077 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2078 } 2079 m_freem(mrep); 2080 } 2081 /* 2082 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2083 * by increasing d_reclen for the last record. 2084 */ 2085 if (blksiz > 0) { 2086 left = DIRBLKSIZ - blksiz; 2087 dp->d_reclen += left; 2088 uiop->uio_iov->iov_base += left; 2089 uiop->uio_iov->iov_len -= left; 2090 uiop->uio_offset += left; 2091 uiop->uio_resid -= left; 2092 } 2093 2094 /* 2095 * We are now either at the end of the directory or have filled the 2096 * block. 2097 */ 2098 if (bigenough) 2099 dnp->n_direofoffset = uiop->uio_offset; 2100 else { 2101 if (uiop->uio_resid > 0) 2102 printf("EEK! readdirrpc resid > 0\n"); 2103 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2104 *cookiep = cookie; 2105 } 2106nfsmout: 2107 return (error); 2108} 2109 2110/* 2111 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2112 */ 2113int 2114nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2115{ 2116 int len, left; 2117 struct dirent *dp; 2118 u_int32_t *tl; 2119 caddr_t cp; 2120 struct vnode *newvp; 2121 nfsuint64 *cookiep; 2122 caddr_t bpos, dpos, dpossav1, dpossav2; 2123 struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2; 2124 struct nameidata nami, *ndp = &nami; 2125 struct componentname *cnp = &ndp->ni_cnd; 2126 nfsuint64 cookie; 2127 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2128 struct nfsnode *dnp = VTONFS(vp), *np; 2129 nfsfh_t *fhp; 2130 u_quad_t fileno; 2131 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2132 int attrflag, fhsize; 2133 2134#ifndef nolint 2135 dp = (struct dirent *)0; 2136#endif 2137#ifndef DIAGNOSTIC 2138 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2139 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2140 panic("nfs readdirplusrpc bad uio"); 2141#endif 2142 ndp->ni_dvp = vp; 2143 newvp = NULLVP; 2144 2145 /* 2146 * If there is no cookie, assume directory was stale. 2147 */ 2148 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2149 if (cookiep) 2150 cookie = *cookiep; 2151 else 2152 return (NFSERR_BAD_COOKIE); 2153 /* 2154 * Loop around doing readdir rpc's of size nm_readdirsize 2155 * truncated to a multiple of DIRBLKSIZ. 2156 * The stopping criteria is EOF or buffer full. 2157 */ 2158 while (more_dirs && bigenough) { 2159 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2160 mreq = nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2161 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2162 mb = mreq; 2163 bpos = mtod(mb, caddr_t); 2164 nfsm_fhtom(vp, 1); 2165 tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED); 2166 *tl++ = cookie.nfsuquad[0]; 2167 *tl++ = cookie.nfsuquad[1]; 2168 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2169 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2170 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2171 *tl = txdr_unsigned(nmp->nm_rsize); 2172 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred); 2173 nfsm_postop_attr(vp, attrflag); 2174 if (error) { 2175 m_freem(mrep); 2176 goto nfsmout; 2177 } 2178 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2179 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2180 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2181 more_dirs = fxdr_unsigned(int, *tl); 2182 2183 /* loop thru the dir entries, doctoring them to 4bsd form */ 2184 while (more_dirs && bigenough) { 2185 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2186 fileno = fxdr_hyper(tl); 2187 len = fxdr_unsigned(int, *(tl + 2)); 2188 if (len <= 0 || len > NFS_MAXNAMLEN) { 2189 error = EBADRPC; 2190 m_freem(mrep); 2191 goto nfsmout; 2192 } 2193 tlen = nfsm_rndup(len); 2194 if (tlen == len) 2195 tlen += 4; /* To ensure null termination*/ 2196 left = DIRBLKSIZ - blksiz; 2197 if ((tlen + DIRHDSIZ) > left) { 2198 dp->d_reclen += left; 2199 uiop->uio_iov->iov_base += left; 2200 uiop->uio_iov->iov_len -= left; 2201 uiop->uio_offset += left; 2202 uiop->uio_resid -= left; 2203 blksiz = 0; 2204 } 2205 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2206 bigenough = 0; 2207 if (bigenough) { 2208 dp = (struct dirent *)uiop->uio_iov->iov_base; 2209 dp->d_fileno = (int)fileno; 2210 dp->d_namlen = len; 2211 dp->d_reclen = tlen + DIRHDSIZ; 2212 dp->d_type = DT_UNKNOWN; 2213 blksiz += dp->d_reclen; 2214 if (blksiz == DIRBLKSIZ) 2215 blksiz = 0; 2216 uiop->uio_offset += DIRHDSIZ; 2217 uiop->uio_resid -= DIRHDSIZ; 2218 uiop->uio_iov->iov_base += DIRHDSIZ; 2219 uiop->uio_iov->iov_len -= DIRHDSIZ; 2220 cnp->cn_nameptr = uiop->uio_iov->iov_base; 2221 cnp->cn_namelen = len; 2222 nfsm_mtouio(uiop, len); 2223 cp = uiop->uio_iov->iov_base; 2224 tlen -= len; 2225 *cp = '\0'; 2226 uiop->uio_iov->iov_base += tlen; 2227 uiop->uio_iov->iov_len -= tlen; 2228 uiop->uio_offset += tlen; 2229 uiop->uio_resid -= tlen; 2230 } else 2231 nfsm_adv(nfsm_rndup(len)); 2232 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2233 if (bigenough) { 2234 cookie.nfsuquad[0] = *tl++; 2235 cookie.nfsuquad[1] = *tl++; 2236 } else 2237 tl += 2; 2238 2239 /* 2240 * Since the attributes are before the file handle 2241 * (sigh), we must skip over the attributes and then 2242 * come back and get them. 2243 */ 2244 attrflag = fxdr_unsigned(int, *tl); 2245 if (attrflag) { 2246 dpossav1 = dpos; 2247 mdsav1 = md; 2248 nfsm_adv(NFSX_V3FATTR); 2249 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2250 doit = fxdr_unsigned(int, *tl); 2251 if (doit) { 2252 nfsm_getfh(fhp, fhsize, 1); 2253 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2254 VREF(vp); 2255 newvp = vp; 2256 np = dnp; 2257 } else { 2258 error = nfs_nget(vp->v_mount, fhp, 2259 fhsize, &np); 2260 if (error) 2261 doit = 0; 2262 else 2263 newvp = NFSTOV(np); 2264 } 2265 } 2266 if (doit && bigenough) { 2267 dpossav2 = dpos; 2268 dpos = dpossav1; 2269 mdsav2 = md; 2270 md = mdsav1; 2271 nfsm_loadattr(newvp, (struct vattr *)0); 2272 dpos = dpossav2; 2273 md = mdsav2; 2274 dp->d_type = 2275 IFTODT(VTTOIF(np->n_vattr.va_type)); 2276 ndp->ni_vp = newvp; 2277 cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp); 2278 } 2279 } else { 2280 /* Just skip over the file handle */ 2281 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2282 i = fxdr_unsigned(int, *tl); 2283 nfsm_adv(nfsm_rndup(i)); 2284 } 2285 if (newvp != NULLVP) { 2286 if (newvp == vp) 2287 vrele(newvp); 2288 else 2289 vput(newvp); 2290 newvp = NULLVP; 2291 } 2292 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2293 more_dirs = fxdr_unsigned(int, *tl); 2294 } 2295 /* 2296 * If at end of rpc data, get the eof boolean 2297 */ 2298 if (!more_dirs) { 2299 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2300 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2301 } 2302 m_freem(mrep); 2303 } 2304 /* 2305 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2306 * by increasing d_reclen for the last record. 2307 */ 2308 if (blksiz > 0) { 2309 left = DIRBLKSIZ - blksiz; 2310 dp->d_reclen += left; 2311 uiop->uio_iov->iov_base += left; 2312 uiop->uio_iov->iov_len -= left; 2313 uiop->uio_offset += left; 2314 uiop->uio_resid -= left; 2315 } 2316 2317 /* 2318 * We are now either at the end of the directory or have filled the 2319 * block. 2320 */ 2321 if (bigenough) 2322 dnp->n_direofoffset = uiop->uio_offset; 2323 else { 2324 if (uiop->uio_resid > 0) 2325 printf("EEK! readdirplusrpc resid > 0\n"); 2326 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2327 *cookiep = cookie; 2328 } 2329nfsmout: 2330 if (newvp != NULLVP) { 2331 if (newvp == vp) 2332 vrele(newvp); 2333 else 2334 vput(newvp); 2335 newvp = NULLVP; 2336 } 2337 return (error); 2338} 2339 2340/* 2341 * Silly rename. To make the NFS filesystem that is stateless look a little 2342 * more like the "ufs" a remove of an active vnode is translated to a rename 2343 * to a funny looking filename that is removed by nfs_inactive on the 2344 * nfsnode. There is the potential for another process on a different client 2345 * to create the same funny name between the nfs_lookitup() fails and the 2346 * nfs_rename() completes, but... 2347 */ 2348static int 2349nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2350{ 2351 struct sillyrename *sp; 2352 struct nfsnode *np; 2353 int error; 2354 short pid; 2355 2356 cache_purge(dvp); 2357 np = VTONFS(vp); 2358#ifndef DIAGNOSTIC 2359 if (vp->v_type == VDIR) 2360 panic("nfs: sillyrename dir"); 2361#endif 2362 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2363 M_NFSREQ, M_WAITOK); 2364 sp->s_cred = crhold(cnp->cn_cred); 2365 sp->s_dvp = dvp; 2366 VREF(dvp); 2367 2368 /* Fudge together a funny name */ 2369 pid = cnp->cn_thread->td_proc->p_pid; 2370 sp->s_namlen = sprintf(sp->s_name, ".nfsA%04x4.4", pid); 2371 2372 /* Try lookitups until we get one that isn't there */ 2373 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2374 cnp->cn_thread, (struct nfsnode **)0) == 0) { 2375 sp->s_name[4]++; 2376 if (sp->s_name[4] > 'z') { 2377 error = EINVAL; 2378 goto bad; 2379 } 2380 } 2381 error = nfs_renameit(dvp, cnp, sp); 2382 if (error) 2383 goto bad; 2384 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2385 cnp->cn_thread, &np); 2386 np->n_sillyrename = sp; 2387 return (0); 2388bad: 2389 vrele(sp->s_dvp); 2390 crfree(sp->s_cred); 2391 free((caddr_t)sp, M_NFSREQ); 2392 return (error); 2393} 2394 2395/* 2396 * Look up a file name and optionally either update the file handle or 2397 * allocate an nfsnode, depending on the value of npp. 2398 * npp == NULL --> just do the lookup 2399 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2400 * handled too 2401 * *npp != NULL --> update the file handle in the vnode 2402 */ 2403static int 2404nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2405 struct thread *td, struct nfsnode **npp) 2406{ 2407 u_int32_t *tl; 2408 struct vnode *newvp = (struct vnode *)0; 2409 struct nfsnode *np, *dnp = VTONFS(dvp); 2410 caddr_t bpos, dpos; 2411 int error = 0, fhlen, attrflag; 2412 struct mbuf *mreq, *mrep, *md, *mb; 2413 nfsfh_t *nfhp; 2414 int v3 = NFS_ISV3(dvp); 2415 2416 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2417 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2418 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2419 mb = mreq; 2420 bpos = mtod(mb, caddr_t); 2421 nfsm_fhtom(dvp, v3); 2422 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2423 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2424 if (npp && !error) { 2425 nfsm_getfh(nfhp, fhlen, v3); 2426 if (*npp) { 2427 np = *npp; 2428 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2429 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2430 np->n_fhp = &np->n_fh; 2431 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2432 np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK); 2433 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2434 np->n_fhsize = fhlen; 2435 newvp = NFSTOV(np); 2436 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2437 VREF(dvp); 2438 newvp = dvp; 2439 } else { 2440 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2441 if (error) { 2442 m_freem(mrep); 2443 return (error); 2444 } 2445 newvp = NFSTOV(np); 2446 } 2447 if (v3) { 2448 nfsm_postop_attr(newvp, attrflag); 2449 if (!attrflag && *npp == NULL) { 2450 m_freem(mrep); 2451 if (newvp == dvp) 2452 vrele(newvp); 2453 else 2454 vput(newvp); 2455 return (ENOENT); 2456 } 2457 } else 2458 nfsm_loadattr(newvp, (struct vattr *)0); 2459 } 2460 m_freem(mrep); 2461nfsmout: 2462 if (npp && *npp == NULL) { 2463 if (error) { 2464 if (newvp) { 2465 if (newvp == dvp) 2466 vrele(newvp); 2467 else 2468 vput(newvp); 2469 } 2470 } else 2471 *npp = np; 2472 } 2473 return (error); 2474} 2475 2476/* 2477 * Nfs Version 3 commit rpc 2478 */ 2479int 2480nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2481 struct thread *td) 2482{ 2483 u_int32_t *tl; 2484 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2485 caddr_t bpos, dpos; 2486 int error = 0, wccflag = NFSV3_WCCRATTR; 2487 struct mbuf *mreq, *mrep, *md, *mb; 2488 2489 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 2490 return (0); 2491 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2492 mreq = nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2493 mb = mreq; 2494 bpos = mtod(mb, caddr_t); 2495 nfsm_fhtom(vp, 1); 2496 tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED); 2497 txdr_hyper(offset, tl); 2498 tl += 2; 2499 *tl = txdr_unsigned(cnt); 2500 nfsm_request(vp, NFSPROC_COMMIT, td, cred); 2501 nfsm_wcc_data(vp, wccflag); 2502 if (!error) { 2503 tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF); 2504 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2505 NFSX_V3WRITEVERF)) { 2506 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2507 NFSX_V3WRITEVERF); 2508 error = NFSERR_STALEWRITEVERF; 2509 } 2510 } 2511 m_freem(mrep); 2512nfsmout: 2513 return (error); 2514} 2515 2516/* 2517 * Strategy routine. 2518 * For async requests when nfsiod(s) are running, queue the request by 2519 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2520 * request. 2521 */ 2522static int 2523nfs_strategy(struct vop_strategy_args *ap) 2524{ 2525 struct buf *bp = ap->a_bp; 2526 struct ucred *cr; 2527 struct thread *td; 2528 int error = 0; 2529 2530 KASSERT(!(bp->b_flags & B_DONE), ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2531 KASSERT(BUF_REFCNT(bp) > 0, ("nfs_strategy: buffer %p not locked", bp)); 2532 2533 if (bp->b_flags & B_PHYS) 2534 panic("nfs physio"); 2535 2536 if (bp->b_flags & B_ASYNC) 2537 td = (struct thread *)0; 2538 else 2539 td = curthread; /* XXX */ 2540 2541 if (bp->b_iocmd == BIO_READ) 2542 cr = bp->b_rcred; 2543 else 2544 cr = bp->b_wcred; 2545 2546 /* 2547 * If the op is asynchronous and an i/o daemon is waiting 2548 * queue the request, wake it up and wait for completion 2549 * otherwise just do it ourselves. 2550 */ 2551 if ((bp->b_flags & B_ASYNC) == 0 || 2552 nfs_asyncio(bp, NOCRED, td)) 2553 error = nfs_doio(bp, cr, td); 2554 return (error); 2555} 2556 2557/* 2558 * fsync vnode op. Just call nfs_flush() with commit == 1. 2559 */ 2560/* ARGSUSED */ 2561static int 2562nfs_fsync(struct vop_fsync_args *ap) 2563{ 2564 2565 return (nfs_flush(ap->a_vp, ap->a_cred, ap->a_waitfor, ap->a_td, 1)); 2566} 2567 2568/* 2569 * Flush all the blocks associated with a vnode. 2570 * Walk through the buffer pool and push any dirty pages 2571 * associated with the vnode. 2572 */ 2573static int 2574nfs_flush(struct vnode *vp, struct ucred *cred, int waitfor, struct thread *td, 2575 int commit) 2576{ 2577 struct nfsnode *np = VTONFS(vp); 2578 struct buf *bp; 2579 int i; 2580 struct buf *nbp; 2581 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2582 int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2583 int passone = 1; 2584 u_quad_t off, endoff, toff; 2585 struct ucred* wcred = NULL; 2586 struct buf **bvec = NULL; 2587#ifndef NFS_COMMITBVECSIZ 2588#define NFS_COMMITBVECSIZ 20 2589#endif 2590 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2591 int bvecsize = 0, bveccount; 2592 2593 if (nmp->nm_flag & NFSMNT_INT) 2594 slpflag = PCATCH; 2595 if (!commit) 2596 passone = 0; 2597 /* 2598 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2599 * server, but nas not been committed to stable storage on the server 2600 * yet. On the first pass, the byte range is worked out and the commit 2601 * rpc is done. On the second pass, nfs_writebp() is called to do the 2602 * job. 2603 */ 2604again: 2605 off = (u_quad_t)-1; 2606 endoff = 0; 2607 bvecpos = 0; 2608 if (NFS_ISV3(vp) && commit) { 2609 s = splbio(); 2610 /* 2611 * Count up how many buffers waiting for a commit. 2612 */ 2613 bveccount = 0; 2614 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2615 nbp = TAILQ_NEXT(bp, b_vnbufs); 2616 if (BUF_REFCNT(bp) == 0 && 2617 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2618 == (B_DELWRI | B_NEEDCOMMIT)) 2619 bveccount++; 2620 } 2621 /* 2622 * Allocate space to remember the list of bufs to commit. It is 2623 * important to use M_NOWAIT here to avoid a race with nfs_write. 2624 * If we can't get memory (for whatever reason), we will end up 2625 * committing the buffers one-by-one in the loop below. 2626 */ 2627 if (bvec != NULL && bvec != bvec_on_stack) 2628 free(bvec, M_TEMP); 2629 if (bveccount > NFS_COMMITBVECSIZ) { 2630 bvec = (struct buf **) 2631 malloc(bveccount * sizeof(struct buf *), 2632 M_TEMP, M_NOWAIT); 2633 if (bvec == NULL) { 2634 bvec = bvec_on_stack; 2635 bvecsize = NFS_COMMITBVECSIZ; 2636 } else 2637 bvecsize = bveccount; 2638 } else { 2639 bvec = bvec_on_stack; 2640 bvecsize = NFS_COMMITBVECSIZ; 2641 } 2642 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2643 nbp = TAILQ_NEXT(bp, b_vnbufs); 2644 if (bvecpos >= bvecsize) 2645 break; 2646 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2647 (B_DELWRI | B_NEEDCOMMIT) || 2648 BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) 2649 continue; 2650 bremfree(bp); 2651 /* 2652 * Work out if all buffers are using the same cred 2653 * so we can deal with them all with one commit. 2654 * 2655 * NOTE: we are not clearing B_DONE here, so we have 2656 * to do it later on in this routine if we intend to 2657 * initiate I/O on the bp. 2658 * 2659 * Note: to avoid loopback deadlocks, we do not 2660 * assign b_runningbufspace. 2661 */ 2662 if (wcred == NULL) 2663 wcred = bp->b_wcred; 2664 else if (wcred != bp->b_wcred) 2665 wcred = NOCRED; 2666 bp->b_flags |= B_WRITEINPROG; 2667 vfs_busy_pages(bp, 1); 2668 2669 /* 2670 * bp is protected by being locked, but nbp is not 2671 * and vfs_busy_pages() may sleep. We have to 2672 * recalculate nbp. 2673 */ 2674 nbp = TAILQ_NEXT(bp, b_vnbufs); 2675 2676 /* 2677 * A list of these buffers is kept so that the 2678 * second loop knows which buffers have actually 2679 * been committed. This is necessary, since there 2680 * may be a race between the commit rpc and new 2681 * uncommitted writes on the file. 2682 */ 2683 bvec[bvecpos++] = bp; 2684 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2685 bp->b_dirtyoff; 2686 if (toff < off) 2687 off = toff; 2688 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 2689 if (toff > endoff) 2690 endoff = toff; 2691 } 2692 splx(s); 2693 } 2694 if (bvecpos > 0) { 2695 /* 2696 * Commit data on the server, as required. 2697 * If all bufs are using the same wcred, then use that with 2698 * one call for all of them, otherwise commit each one 2699 * separately. 2700 */ 2701 if (wcred != NOCRED) 2702 retv = nfs_commit(vp, off, (int)(endoff - off), 2703 wcred, td); 2704 else { 2705 retv = 0; 2706 for (i = 0; i < bvecpos; i++) { 2707 off_t off, size; 2708 bp = bvec[i]; 2709 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2710 bp->b_dirtyoff; 2711 size = (u_quad_t)(bp->b_dirtyend 2712 - bp->b_dirtyoff); 2713 retv = nfs_commit(vp, off, (int)size, 2714 bp->b_wcred, td); 2715 if (retv) break; 2716 } 2717 } 2718 2719 if (retv == NFSERR_STALEWRITEVERF) 2720 nfs_clearcommit(vp->v_mount); 2721 2722 /* 2723 * Now, either mark the blocks I/O done or mark the 2724 * blocks dirty, depending on whether the commit 2725 * succeeded. 2726 */ 2727 for (i = 0; i < bvecpos; i++) { 2728 bp = bvec[i]; 2729 bp->b_flags &= ~(B_NEEDCOMMIT | B_WRITEINPROG | B_CLUSTEROK); 2730 if (retv) { 2731 /* 2732 * Error, leave B_DELWRI intact 2733 */ 2734 vfs_unbusy_pages(bp); 2735 brelse(bp); 2736 } else { 2737 /* 2738 * Success, remove B_DELWRI ( bundirty() ). 2739 * 2740 * b_dirtyoff/b_dirtyend seem to be NFS 2741 * specific. We should probably move that 2742 * into bundirty(). XXX 2743 */ 2744 s = splbio(); 2745 vp->v_numoutput++; 2746 bp->b_flags |= B_ASYNC; 2747 bundirty(bp); 2748 bp->b_flags &= ~B_DONE; 2749 bp->b_ioflags &= ~BIO_ERROR; 2750 bp->b_dirtyoff = bp->b_dirtyend = 0; 2751 splx(s); 2752 bufdone(bp); 2753 } 2754 } 2755 } 2756 2757 /* 2758 * Start/do any write(s) that are required. 2759 */ 2760loop: 2761 s = splbio(); 2762 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2763 nbp = TAILQ_NEXT(bp, b_vnbufs); 2764 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { 2765 if (waitfor != MNT_WAIT || passone) 2766 continue; 2767 error = BUF_TIMELOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL, 2768 "nfsfsync", slpflag, slptimeo); 2769 splx(s); 2770 if (error == 0) 2771 panic("nfs_fsync: inconsistent lock"); 2772 if (error == ENOLCK) 2773 goto loop; 2774 if (nfs_sigintr(nmp, (struct nfsreq *)0, td->td_proc)) { 2775 error = EINTR; 2776 goto done; 2777 } 2778 if (slpflag == PCATCH) { 2779 slpflag = 0; 2780 slptimeo = 2 * hz; 2781 } 2782 goto loop; 2783 } 2784 if ((bp->b_flags & B_DELWRI) == 0) 2785 panic("nfs_fsync: not dirty"); 2786 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 2787 BUF_UNLOCK(bp); 2788 continue; 2789 } 2790 bremfree(bp); 2791 if (passone || !commit) 2792 bp->b_flags |= B_ASYNC; 2793 else 2794 bp->b_flags |= B_ASYNC | B_WRITEINPROG; 2795 splx(s); 2796 BUF_WRITE(bp); 2797 goto loop; 2798 } 2799 splx(s); 2800 if (passone) { 2801 passone = 0; 2802 goto again; 2803 } 2804 if (waitfor == MNT_WAIT) { 2805 while (vp->v_numoutput) { 2806 vp->v_flag |= VBWAIT; 2807 error = tsleep((caddr_t)&vp->v_numoutput, 2808 slpflag | (PRIBIO + 1), "nfsfsync", slptimeo); 2809 if (error) { 2810 if (nfs_sigintr(nmp, (struct nfsreq *)0, td->td_proc)) { 2811 error = EINTR; 2812 goto done; 2813 } 2814 if (slpflag == PCATCH) { 2815 slpflag = 0; 2816 slptimeo = 2 * hz; 2817 } 2818 } 2819 } 2820 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) && commit) { 2821 goto loop; 2822 } 2823 } 2824 if (np->n_flag & NWRITEERR) { 2825 error = np->n_error; 2826 np->n_flag &= ~NWRITEERR; 2827 } 2828done: 2829 if (bvec != NULL && bvec != bvec_on_stack) 2830 free(bvec, M_TEMP); 2831 return (error); 2832} 2833 2834/* 2835 * NFS advisory byte-level locks. 2836 */ 2837static int 2838nfs_advlock(struct vop_advlock_args *ap) 2839{ 2840 2841 return (nfs_dolock(ap)); 2842} 2843 2844/* 2845 * Print out the contents of an nfsnode. 2846 */ 2847static int 2848nfs_print(struct vop_print_args *ap) 2849{ 2850 struct vnode *vp = ap->a_vp; 2851 struct nfsnode *np = VTONFS(vp); 2852 2853 printf("tag VT_NFS, fileid %ld fsid 0x%x", 2854 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 2855 if (vp->v_type == VFIFO) 2856 fifo_printinfo(vp); 2857 printf("\n"); 2858 return (0); 2859} 2860 2861/* 2862 * This is the "real" nfs::bwrite(struct buf*). 2863 * B_WRITEINPROG isn't set unless the force flag is one and it 2864 * handles the B_NEEDCOMMIT flag. 2865 * We set B_CACHE if this is a VMIO buffer. 2866 */ 2867int 2868nfs_writebp(struct buf *bp, int force, struct thread *td) 2869{ 2870 int s; 2871 int oldflags = bp->b_flags; 2872#if 0 2873 int retv = 1; 2874 off_t off; 2875#endif 2876 2877 if (BUF_REFCNT(bp) == 0) 2878 panic("bwrite: buffer is not locked???"); 2879 2880 if (bp->b_flags & B_INVAL) { 2881 brelse(bp); 2882 return(0); 2883 } 2884 2885 bp->b_flags |= B_CACHE; 2886 2887 /* 2888 * Undirty the bp. We will redirty it later if the I/O fails. 2889 */ 2890 2891 s = splbio(); 2892 bundirty(bp); 2893 bp->b_flags &= ~B_DONE; 2894 bp->b_ioflags &= ~BIO_ERROR; 2895 bp->b_iocmd = BIO_WRITE; 2896 2897 bp->b_vp->v_numoutput++; 2898 curthread->td_proc->p_stats->p_ru.ru_oublock++; 2899 splx(s); 2900 2901 /* 2902 * Note: to avoid loopback deadlocks, we do not 2903 * assign b_runningbufspace. 2904 */ 2905 vfs_busy_pages(bp, 1); 2906 2907 if (force) 2908 bp->b_flags |= B_WRITEINPROG; 2909 BUF_KERNPROC(bp); 2910 BUF_STRATEGY(bp); 2911 2912 if( (oldflags & B_ASYNC) == 0) { 2913 int rtval = bufwait(bp); 2914 2915 if (oldflags & B_DELWRI) { 2916 s = splbio(); 2917 reassignbuf(bp, bp->b_vp); 2918 splx(s); 2919 } 2920 2921 brelse(bp); 2922 return (rtval); 2923 } 2924 2925 return (0); 2926} 2927 2928/* 2929 * nfs special file access vnode op. 2930 * Essentially just get vattr and then imitate iaccess() since the device is 2931 * local to the client. 2932 */ 2933static int 2934nfsspec_access(struct vop_access_args *ap) 2935{ 2936 struct vattr *vap; 2937 gid_t *gp; 2938 struct ucred *cred = ap->a_cred; 2939 struct vnode *vp = ap->a_vp; 2940 mode_t mode = ap->a_mode; 2941 struct vattr vattr; 2942 int i; 2943 int error; 2944 2945 /* 2946 * Disallow write attempts on filesystems mounted read-only; 2947 * unless the file is a socket, fifo, or a block or character 2948 * device resident on the filesystem. 2949 */ 2950 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 2951 switch (vp->v_type) { 2952 case VREG: 2953 case VDIR: 2954 case VLNK: 2955 return (EROFS); 2956 default: 2957 break; 2958 } 2959 } 2960 /* 2961 * If you're the super-user, 2962 * you always get access. 2963 */ 2964 if (cred->cr_uid == 0) 2965 return (0); 2966 vap = &vattr; 2967 error = VOP_GETATTR(vp, vap, cred, ap->a_td); 2968 if (error) 2969 return (error); 2970 /* 2971 * Access check is based on only one of owner, group, public. 2972 * If not owner, then check group. If not a member of the 2973 * group, then check public access. 2974 */ 2975 if (cred->cr_uid != vap->va_uid) { 2976 mode >>= 3; 2977 gp = cred->cr_groups; 2978 for (i = 0; i < cred->cr_ngroups; i++, gp++) 2979 if (vap->va_gid == *gp) 2980 goto found; 2981 mode >>= 3; 2982found: 2983 ; 2984 } 2985 error = (vap->va_mode & mode) == mode ? 0 : EACCES; 2986 return (error); 2987} 2988 2989/* 2990 * Read wrapper for special devices. 2991 */ 2992static int 2993nfsspec_read(struct vop_read_args *ap) 2994{ 2995 struct nfsnode *np = VTONFS(ap->a_vp); 2996 2997 /* 2998 * Set access flag. 2999 */ 3000 np->n_flag |= NACC; 3001 getnanotime(&np->n_atim); 3002 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap)); 3003} 3004 3005/* 3006 * Write wrapper for special devices. 3007 */ 3008static int 3009nfsspec_write(struct vop_write_args *ap) 3010{ 3011 struct nfsnode *np = VTONFS(ap->a_vp); 3012 3013 /* 3014 * Set update flag. 3015 */ 3016 np->n_flag |= NUPD; 3017 getnanotime(&np->n_mtim); 3018 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap)); 3019} 3020 3021/* 3022 * Close wrapper for special devices. 3023 * 3024 * Update the times on the nfsnode then do device close. 3025 */ 3026static int 3027nfsspec_close(struct vop_close_args *ap) 3028{ 3029 struct vnode *vp = ap->a_vp; 3030 struct nfsnode *np = VTONFS(vp); 3031 struct vattr vattr; 3032 3033 if (np->n_flag & (NACC | NUPD)) { 3034 np->n_flag |= NCHG; 3035 if (vp->v_usecount == 1 && 3036 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3037 VATTR_NULL(&vattr); 3038 if (np->n_flag & NACC) 3039 vattr.va_atime = np->n_atim; 3040 if (np->n_flag & NUPD) 3041 vattr.va_mtime = np->n_mtim; 3042 (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_td); 3043 } 3044 } 3045 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 3046} 3047 3048/* 3049 * Read wrapper for fifos. 3050 */ 3051static int 3052nfsfifo_read(struct vop_read_args *ap) 3053{ 3054 struct nfsnode *np = VTONFS(ap->a_vp); 3055 3056 /* 3057 * Set access flag. 3058 */ 3059 np->n_flag |= NACC; 3060 getnanotime(&np->n_atim); 3061 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap)); 3062} 3063 3064/* 3065 * Write wrapper for fifos. 3066 */ 3067static int 3068nfsfifo_write(struct vop_write_args *ap) 3069{ 3070 struct nfsnode *np = VTONFS(ap->a_vp); 3071 3072 /* 3073 * Set update flag. 3074 */ 3075 np->n_flag |= NUPD; 3076 getnanotime(&np->n_mtim); 3077 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap)); 3078} 3079 3080/* 3081 * Close wrapper for fifos. 3082 * 3083 * Update the times on the nfsnode then do fifo close. 3084 */ 3085static int 3086nfsfifo_close(struct vop_close_args *ap) 3087{ 3088 struct vnode *vp = ap->a_vp; 3089 struct nfsnode *np = VTONFS(vp); 3090 struct vattr vattr; 3091 struct timespec ts; 3092 3093 if (np->n_flag & (NACC | NUPD)) { 3094 getnanotime(&ts); 3095 if (np->n_flag & NACC) 3096 np->n_atim = ts; 3097 if (np->n_flag & NUPD) 3098 np->n_mtim = ts; 3099 np->n_flag |= NCHG; 3100 if (vp->v_usecount == 1 && 3101 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3102 VATTR_NULL(&vattr); 3103 if (np->n_flag & NACC) 3104 vattr.va_atime = np->n_atim; 3105 if (np->n_flag & NUPD) 3106 vattr.va_mtime = np->n_mtim; 3107 (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_td); 3108 } 3109 } 3110 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 3111} 3112