Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/nfs/nfs_vnops.c
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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 * $FreeBSD$ 38 */ 39 40 41 /* 42 * vnode op calls for Sun NFS version 2 and 3 43 */ 44 45 #include "opt_inet.h" 46 47 #include <sys/param.h> 48 #include <sys/kernel.h> 49 #include <sys/systm.h> 50 #include <sys/resourcevar.h> 51 #include <sys/proc.h> 52 #include <sys/mount.h> 53 #include <sys/buf.h> 54 #include <sys/malloc.h> 55 #include <sys/mbuf.h> 56 #include <sys/namei.h> 57 #include <sys/socket.h> 58 #include <sys/vnode.h> 59 #include <sys/dirent.h> 60 #include <sys/fcntl.h> 61 #include <sys/lockf.h> 62 #include <sys/stat.h> 63 #include <sys/sysctl.h> 64 65 #include <vm/vm.h> 66 #include <vm/vm_extern.h> 67 #include <vm/vm_zone.h> 68 69 #include <miscfs/fifofs/fifo.h> 70 #include <miscfs/specfs/specdev.h> 71 72 #include <nfs/rpcv2.h> 73 #include <nfs/nfsproto.h> 74 #include <nfs/nfs.h> 75 #include <nfs/nfsnode.h> 76 #include <nfs/nfsmount.h> 77 #include <nfs/xdr_subs.h> 78 #include <nfs/nfsm_subs.h> 79 #include <nfs/nqnfs.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 98 static int nfsspec_read __P((struct vop_read_args *)); 99 static int nfsspec_write __P((struct vop_write_args *)); 100 static int nfsfifo_read __P((struct vop_read_args *)); 101 static int nfsfifo_write __P((struct vop_write_args *)); 102 static int nfsspec_close __P((struct vop_close_args *)); 103 static int nfsfifo_close __P((struct vop_close_args *)); 104 #define nfs_poll vop_nopoll 105 static int nfs_flush __P((struct vnode *,struct ucred *,int,struct proc *,int)); 106 static int nfs_setattrrpc __P((struct vnode *,struct vattr *,struct ucred *,struct proc *)); 107 static int nfs_lookup __P((struct vop_lookup_args *)); 108 static int nfs_create __P((struct vop_create_args *)); 109 static int nfs_mknod __P((struct vop_mknod_args *)); 110 static int nfs_open __P((struct vop_open_args *)); 111 static int nfs_close __P((struct vop_close_args *)); 112 static int nfs_access __P((struct vop_access_args *)); 113 static int nfs_getattr __P((struct vop_getattr_args *)); 114 static int nfs_setattr __P((struct vop_setattr_args *)); 115 static int nfs_read __P((struct vop_read_args *)); 116 static int nfs_mmap __P((struct vop_mmap_args *)); 117 static int nfs_fsync __P((struct vop_fsync_args *)); 118 static int nfs_remove __P((struct vop_remove_args *)); 119 static int nfs_link __P((struct vop_link_args *)); 120 static int nfs_rename __P((struct vop_rename_args *)); 121 static int nfs_mkdir __P((struct vop_mkdir_args *)); 122 static int nfs_rmdir __P((struct vop_rmdir_args *)); 123 static int nfs_symlink __P((struct vop_symlink_args *)); 124 static int nfs_readdir __P((struct vop_readdir_args *)); 125 static int nfs_bmap __P((struct vop_bmap_args *)); 126 static int nfs_strategy __P((struct vop_strategy_args *)); 127 static int nfs_lookitup __P((struct vnode *, const char *, int, 128 struct ucred *, struct proc *, struct nfsnode **)); 129 static int nfs_sillyrename __P((struct vnode *,struct vnode *,struct componentname *)); 130 static int nfsspec_access __P((struct vop_access_args *)); 131 static int nfs_readlink __P((struct vop_readlink_args *)); 132 static int nfs_print __P((struct vop_print_args *)); 133 static int nfs_advlock __P((struct vop_advlock_args *)); 134 static int nfs_bwrite __P((struct vop_bwrite_args *)); 135 /* 136 * Global vfs data structures for nfs 137 */ 138 vop_t **nfsv2_vnodeop_p; 139 static struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = { 140 { &vop_default_desc, (vop_t *) vop_defaultop }, 141 { &vop_abortop_desc, (vop_t *) nfs_abortop }, 142 { &vop_access_desc, (vop_t *) nfs_access }, 143 { &vop_advlock_desc, (vop_t *) nfs_advlock }, 144 { &vop_bmap_desc, (vop_t *) nfs_bmap }, 145 { &vop_bwrite_desc, (vop_t *) nfs_bwrite }, 146 { &vop_close_desc, (vop_t *) nfs_close }, 147 { &vop_create_desc, (vop_t *) nfs_create }, 148 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 149 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 150 { &vop_getpages_desc, (vop_t *) nfs_getpages }, 151 { &vop_putpages_desc, (vop_t *) nfs_putpages }, 152 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 153 { &vop_lease_desc, (vop_t *) vop_null }, 154 { &vop_link_desc, (vop_t *) nfs_link }, 155 { &vop_lock_desc, (vop_t *) vop_sharedlock }, 156 { &vop_lookup_desc, (vop_t *) nfs_lookup }, 157 { &vop_mkdir_desc, (vop_t *) nfs_mkdir }, 158 { &vop_mknod_desc, (vop_t *) nfs_mknod }, 159 { &vop_mmap_desc, (vop_t *) nfs_mmap }, 160 { &vop_open_desc, (vop_t *) nfs_open }, 161 { &vop_poll_desc, (vop_t *) nfs_poll }, 162 { &vop_print_desc, (vop_t *) nfs_print }, 163 { &vop_read_desc, (vop_t *) nfs_read }, 164 { &vop_readdir_desc, (vop_t *) nfs_readdir }, 165 { &vop_readlink_desc, (vop_t *) nfs_readlink }, 166 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 167 { &vop_remove_desc, (vop_t *) nfs_remove }, 168 { &vop_rename_desc, (vop_t *) nfs_rename }, 169 { &vop_rmdir_desc, (vop_t *) nfs_rmdir }, 170 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 171 { &vop_strategy_desc, (vop_t *) nfs_strategy }, 172 { &vop_symlink_desc, (vop_t *) nfs_symlink }, 173 { &vop_write_desc, (vop_t *) nfs_write }, 174 { NULL, NULL } 175 }; 176 static struct vnodeopv_desc nfsv2_vnodeop_opv_desc = 177 { &nfsv2_vnodeop_p, nfsv2_vnodeop_entries }; 178 VNODEOP_SET(nfsv2_vnodeop_opv_desc); 179 180 /* 181 * Special device vnode ops 182 */ 183 vop_t **spec_nfsv2nodeop_p; 184 static struct vnodeopv_entry_desc nfsv2_specop_entries[] = { 185 { &vop_default_desc, (vop_t *) spec_vnoperate }, 186 { &vop_access_desc, (vop_t *) nfsspec_access }, 187 { &vop_close_desc, (vop_t *) nfsspec_close }, 188 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 189 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 190 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 191 { &vop_lock_desc, (vop_t *) vop_sharedlock }, 192 { &vop_print_desc, (vop_t *) nfs_print }, 193 { &vop_read_desc, (vop_t *) nfsspec_read }, 194 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 195 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 196 { &vop_write_desc, (vop_t *) nfsspec_write }, 197 { NULL, NULL } 198 }; 199 static struct vnodeopv_desc spec_nfsv2nodeop_opv_desc = 200 { &spec_nfsv2nodeop_p, nfsv2_specop_entries }; 201 VNODEOP_SET(spec_nfsv2nodeop_opv_desc); 202 203 vop_t **fifo_nfsv2nodeop_p; 204 static struct vnodeopv_entry_desc nfsv2_fifoop_entries[] = { 205 { &vop_default_desc, (vop_t *) fifo_vnoperate }, 206 { &vop_access_desc, (vop_t *) nfsspec_access }, 207 { &vop_close_desc, (vop_t *) nfsfifo_close }, 208 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 209 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 210 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 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_write_desc, (vop_t *) nfsfifo_write }, 217 { NULL, NULL } 218 }; 219 static struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc = 220 { &fifo_nfsv2nodeop_p, nfsv2_fifoop_entries }; 221 VNODEOP_SET(fifo_nfsv2nodeop_opv_desc); 222 223 static int nfs_commit __P((struct vnode *vp, u_quad_t offset, int cnt, 224 struct ucred *cred, struct proc *procp)); 225 static int nfs_mknodrpc __P((struct vnode *dvp, struct vnode **vpp, 226 struct componentname *cnp, 227 struct vattr *vap)); 228 static int nfs_removerpc __P((struct vnode *dvp, const char *name, 229 int namelen, 230 struct ucred *cred, struct proc *proc)); 231 static int nfs_renamerpc __P((struct vnode *fdvp, const char *fnameptr, 232 int fnamelen, struct vnode *tdvp, 233 const char *tnameptr, int tnamelen, 234 struct ucred *cred, struct proc *proc)); 235 static int nfs_renameit __P((struct vnode *sdvp, 236 struct componentname *scnp, 237 struct sillyrename *sp)); 238 239 /* 240 * Global variables 241 */ 242 extern u_int32_t nfs_true, nfs_false; 243 extern u_int32_t nfs_xdrneg1; 244 extern struct nfsstats nfsstats; 245 extern nfstype nfsv3_type[9]; 246 struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON]; 247 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; 248 int nfs_numasync = 0; 249 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1)) 250 251 static int nfsaccess_cache_timeout = 2; 252 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 253 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 254 255 static int nfsaccess_cache_hits; 256 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 257 &nfsaccess_cache_hits, 0, "NFS ACCESS cache hit count"); 258 259 static int nfsaccess_cache_fills; 260 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_fills, CTLFLAG_RD, 261 &nfsaccess_cache_fills, 0, "NFS ACCESS cache fill count"); 262 263 /* 264 * nfs access vnode op. 265 * For nfs version 2, just return ok. File accesses may fail later. 266 * For nfs version 3, use the access rpc to check accessibility. If file modes 267 * are changed on the server, accesses might still fail later. 268 */ 269 static int 270 nfs_access(ap) 271 struct vop_access_args /* { 272 struct vnode *a_vp; 273 int a_mode; 274 struct ucred *a_cred; 275 struct proc *a_p; 276 } */ *ap; 277 { 278 register struct vnode *vp = ap->a_vp; 279 register u_int32_t *tl; 280 register caddr_t cp; 281 register int32_t t1, t2; 282 caddr_t bpos, dpos, cp2; 283 int error = 0, attrflag; 284 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 285 u_int32_t mode, rmode, wmode; 286 int v3 = NFS_ISV3(vp); 287 struct nfsnode *np = VTONFS(vp); 288 289 /* 290 * Disallow write attempts on filesystems mounted read-only; 291 * unless the file is a socket, fifo, or a block or character 292 * device resident on the filesystem. 293 */ 294 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 295 switch (vp->v_type) { 296 case VREG: 297 case VDIR: 298 case VLNK: 299 return (EROFS); 300 default: 301 break; 302 } 303 } 304 /* 305 * For nfs v3, check to see if we have done this recently, and if 306 * so return our cached result instead of making an ACCESS call. 307 * If not, do an access rpc, otherwise you are stuck emulating 308 * ufs_access() locally using the vattr. This may not be correct, 309 * since the server may apply other access criteria such as 310 * client uid-->server uid mapping that we do not know about. 311 */ 312 if (v3) { 313 if (ap->a_mode & VREAD) 314 mode = NFSV3ACCESS_READ; 315 else 316 mode = 0; 317 if (vp->v_type != VDIR) { 318 if (ap->a_mode & VWRITE) 319 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 320 if (ap->a_mode & VEXEC) 321 mode |= NFSV3ACCESS_EXECUTE; 322 } else { 323 if (ap->a_mode & VWRITE) 324 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 325 NFSV3ACCESS_DELETE); 326 if (ap->a_mode & VEXEC) 327 mode |= NFSV3ACCESS_LOOKUP; 328 } 329 /* XXX safety belt, only make blanket request if caching */ 330 if (nfsaccess_cache_timeout > 0) { 331 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 332 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 333 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 334 } else { 335 wmode = mode; 336 } 337 338 /* 339 * Does our cached result allow us to give a definite yes to 340 * this request? 341 */ 342 if ((time_second < (np->n_modestamp + nfsaccess_cache_timeout)) && 343 (ap->a_cred->cr_uid == np->n_modeuid) && 344 ((np->n_mode & mode) == mode)) { 345 nfsaccess_cache_hits++; 346 } else { 347 /* 348 * Either a no, or a don't know. Go to the wire. 349 */ 350 nfsstats.rpccnt[NFSPROC_ACCESS]++; 351 nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 352 nfsm_fhtom(vp, v3); 353 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 354 *tl = txdr_unsigned(wmode); 355 nfsm_request(vp, NFSPROC_ACCESS, ap->a_p, ap->a_cred); 356 nfsm_postop_attr(vp, attrflag); 357 if (!error) { 358 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 359 rmode = fxdr_unsigned(u_int32_t, *tl); 360 /* 361 * The NFS V3 spec does not clarify whether or not 362 * the returned access bits can be a superset of 363 * the ones requested, so... 364 */ 365 if ((rmode & mode) != mode) { 366 error = EACCES; 367 } else if (nfsaccess_cache_timeout > 0) { 368 /* cache the result */ 369 nfsaccess_cache_fills++; 370 np->n_mode = rmode; 371 np->n_modeuid = ap->a_cred->cr_uid; 372 np->n_modestamp = time_second; 373 } 374 } 375 nfsm_reqdone; 376 } 377 return (error); 378 } else { 379 if (error = nfsspec_access(ap)) 380 return (error); 381 382 /* 383 * Attempt to prevent a mapped root from accessing a file 384 * which it shouldn't. We try to read a byte from the file 385 * if the user is root and the file is not zero length. 386 * After calling nfsspec_access, we should have the correct 387 * file size cached. 388 */ 389 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD) 390 && VTONFS(vp)->n_size > 0) { 391 struct iovec aiov; 392 struct uio auio; 393 char buf[1]; 394 395 aiov.iov_base = buf; 396 aiov.iov_len = 1; 397 auio.uio_iov = &aiov; 398 auio.uio_iovcnt = 1; 399 auio.uio_offset = 0; 400 auio.uio_resid = 1; 401 auio.uio_segflg = UIO_SYSSPACE; 402 auio.uio_rw = UIO_READ; 403 auio.uio_procp = ap->a_p; 404 405 if (vp->v_type == VREG) 406 error = nfs_readrpc(vp, &auio, ap->a_cred); 407 else if (vp->v_type == VDIR) { 408 char* bp; 409 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 410 aiov.iov_base = bp; 411 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 412 error = nfs_readdirrpc(vp, &auio, ap->a_cred); 413 free(bp, M_TEMP); 414 } else if (vp->v_type == VLNK) 415 error = nfs_readlinkrpc(vp, &auio, ap->a_cred); 416 else 417 error = EACCES; 418 } 419 return (error); 420 } 421 } 422 423 /* 424 * nfs open vnode op 425 * Check to see if the type is ok 426 * and that deletion is not in progress. 427 * For paged in text files, you will need to flush the page cache 428 * if consistency is lost. 429 */ 430 /* ARGSUSED */ 431 static int 432 nfs_open(ap) 433 struct vop_open_args /* { 434 struct vnode *a_vp; 435 int a_mode; 436 struct ucred *a_cred; 437 struct proc *a_p; 438 } */ *ap; 439 { 440 register struct vnode *vp = ap->a_vp; 441 struct nfsnode *np = VTONFS(vp); 442 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 443 struct vattr vattr; 444 int error; 445 446 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 447 #ifdef DIAGNOSTIC 448 printf("open eacces vtyp=%d\n",vp->v_type); 449 #endif 450 return (EACCES); 451 } 452 /* 453 * Get a valid lease. If cached data is stale, flush it. 454 */ 455 if (nmp->nm_flag & NFSMNT_NQNFS) { 456 if (NQNFS_CKINVALID(vp, np, ND_READ)) { 457 do { 458 error = nqnfs_getlease(vp, ND_READ, ap->a_cred, 459 ap->a_p); 460 } while (error == NQNFS_EXPIRED); 461 if (error) 462 return (error); 463 if (np->n_lrev != np->n_brev || 464 (np->n_flag & NQNFSNONCACHE)) { 465 if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, 466 ap->a_p, 1)) == EINTR) 467 return (error); 468 np->n_brev = np->n_lrev; 469 } 470 } 471 } else { 472 if (np->n_flag & NMODIFIED) { 473 if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, 474 ap->a_p, 1)) == EINTR) 475 return (error); 476 np->n_attrstamp = 0; 477 if (vp->v_type == VDIR) 478 np->n_direofoffset = 0; 479 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_p); 480 if (error) 481 return (error); 482 np->n_mtime = vattr.va_mtime.tv_sec; 483 } else { 484 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_p); 485 if (error) 486 return (error); 487 if (np->n_mtime != vattr.va_mtime.tv_sec) { 488 if (vp->v_type == VDIR) 489 np->n_direofoffset = 0; 490 if ((error = nfs_vinvalbuf(vp, V_SAVE, 491 ap->a_cred, ap->a_p, 1)) == EINTR) 492 return (error); 493 np->n_mtime = vattr.va_mtime.tv_sec; 494 } 495 } 496 } 497 if ((nmp->nm_flag & NFSMNT_NQNFS) == 0) 498 np->n_attrstamp = 0; /* For Open/Close consistency */ 499 return (0); 500 } 501 502 /* 503 * nfs close vnode op 504 * What an NFS client should do upon close after writing is a debatable issue. 505 * Most NFS clients push delayed writes to the server upon close, basically for 506 * two reasons: 507 * 1 - So that any write errors may be reported back to the client process 508 * doing the close system call. By far the two most likely errors are 509 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 510 * 2 - To put a worst case upper bound on cache inconsistency between 511 * multiple clients for the file. 512 * There is also a consistency problem for Version 2 of the protocol w.r.t. 513 * not being able to tell if other clients are writing a file concurrently, 514 * since there is no way of knowing if the changed modify time in the reply 515 * is only due to the write for this client. 516 * (NFS Version 3 provides weak cache consistency data in the reply that 517 * should be sufficient to detect and handle this case.) 518 * 519 * The current code does the following: 520 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 521 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 522 * or commit them (this satisfies 1 and 2 except for the 523 * case where the server crashes after this close but 524 * before the commit RPC, which is felt to be "good 525 * enough". Changing the last argument to nfs_flush() to 526 * a 1 would force a commit operation, if it is felt a 527 * commit is necessary now. 528 * for NQNFS - do nothing now, since 2 is dealt with via leases and 529 * 1 should be dealt with via an fsync() system call for 530 * cases where write errors are important. 531 */ 532 /* ARGSUSED */ 533 static int 534 nfs_close(ap) 535 struct vop_close_args /* { 536 struct vnodeop_desc *a_desc; 537 struct vnode *a_vp; 538 int a_fflag; 539 struct ucred *a_cred; 540 struct proc *a_p; 541 } */ *ap; 542 { 543 register struct vnode *vp = ap->a_vp; 544 register struct nfsnode *np = VTONFS(vp); 545 int error = 0; 546 547 if (vp->v_type == VREG) { 548 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) == 0 && 549 (np->n_flag & NMODIFIED)) { 550 if (NFS_ISV3(vp)) { 551 error = nfs_flush(vp, ap->a_cred, MNT_WAIT, ap->a_p, 0); 552 np->n_flag &= ~NMODIFIED; 553 } else 554 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p, 1); 555 np->n_attrstamp = 0; 556 } 557 if (np->n_flag & NWRITEERR) { 558 np->n_flag &= ~NWRITEERR; 559 error = np->n_error; 560 } 561 } 562 return (error); 563 } 564 565 /* 566 * nfs getattr call from vfs. 567 */ 568 static int 569 nfs_getattr(ap) 570 struct vop_getattr_args /* { 571 struct vnode *a_vp; 572 struct vattr *a_vap; 573 struct ucred *a_cred; 574 struct proc *a_p; 575 } */ *ap; 576 { 577 register struct vnode *vp = ap->a_vp; 578 register struct nfsnode *np = VTONFS(vp); 579 register caddr_t cp; 580 register u_int32_t *tl; 581 register int32_t t1, t2; 582 caddr_t bpos, dpos; 583 int error = 0; 584 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 585 int v3 = NFS_ISV3(vp); 586 587 /* 588 * Update local times for special files. 589 */ 590 if (np->n_flag & (NACC | NUPD)) 591 np->n_flag |= NCHG; 592 /* 593 * First look in the cache. 594 */ 595 if (nfs_getattrcache(vp, ap->a_vap) == 0) 596 return (0); 597 nfsstats.rpccnt[NFSPROC_GETATTR]++; 598 nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); 599 nfsm_fhtom(vp, v3); 600 nfsm_request(vp, NFSPROC_GETATTR, ap->a_p, ap->a_cred); 601 if (!error) { 602 nfsm_loadattr(vp, ap->a_vap); 603 } 604 nfsm_reqdone; 605 return (error); 606 } 607 608 /* 609 * nfs setattr call. 610 */ 611 static int 612 nfs_setattr(ap) 613 struct vop_setattr_args /* { 614 struct vnodeop_desc *a_desc; 615 struct vnode *a_vp; 616 struct vattr *a_vap; 617 struct ucred *a_cred; 618 struct proc *a_p; 619 } */ *ap; 620 { 621 register struct vnode *vp = ap->a_vp; 622 register struct nfsnode *np = VTONFS(vp); 623 register struct vattr *vap = ap->a_vap; 624 int error = 0; 625 u_quad_t tsize; 626 627 #ifndef nolint 628 tsize = (u_quad_t)0; 629 #endif 630 631 /* 632 * Setting of flags is not supported. 633 */ 634 if (vap->va_flags != VNOVAL) 635 return (EOPNOTSUPP); 636 637 /* 638 * Disallow write attempts if the filesystem is mounted read-only. 639 */ 640 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 641 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 642 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 643 (vp->v_mount->mnt_flag & MNT_RDONLY)) 644 return (EROFS); 645 if (vap->va_size != VNOVAL) { 646 switch (vp->v_type) { 647 case VDIR: 648 return (EISDIR); 649 case VCHR: 650 case VBLK: 651 case VSOCK: 652 case VFIFO: 653 if (vap->va_mtime.tv_sec == VNOVAL && 654 vap->va_atime.tv_sec == VNOVAL && 655 vap->va_mode == (mode_t)VNOVAL && 656 vap->va_uid == (uid_t)VNOVAL && 657 vap->va_gid == (gid_t)VNOVAL) 658 return (0); 659 vap->va_size = VNOVAL; 660 break; 661 default: 662 /* 663 * Disallow write attempts if the filesystem is 664 * mounted read-only. 665 */ 666 if (vp->v_mount->mnt_flag & MNT_RDONLY) 667 return (EROFS); 668 vnode_pager_setsize(vp, vap->va_size); 669 if (np->n_flag & NMODIFIED) { 670 if (vap->va_size == 0) 671 error = nfs_vinvalbuf(vp, 0, 672 ap->a_cred, ap->a_p, 1); 673 else 674 error = nfs_vinvalbuf(vp, V_SAVE, 675 ap->a_cred, ap->a_p, 1); 676 if (error) { 677 vnode_pager_setsize(vp, np->n_size); 678 return (error); 679 } 680 } 681 tsize = np->n_size; 682 np->n_size = np->n_vattr.va_size = vap->va_size; 683 }; 684 } else if ((vap->va_mtime.tv_sec != VNOVAL || 685 vap->va_atime.tv_sec != VNOVAL) && (np->n_flag & NMODIFIED) && 686 vp->v_type == VREG && 687 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, 688 ap->a_p, 1)) == EINTR) 689 return (error); 690 error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_p); 691 if (error && vap->va_size != VNOVAL) { 692 np->n_size = np->n_vattr.va_size = tsize; 693 vnode_pager_setsize(vp, np->n_size); 694 } 695 return (error); 696 } 697 698 /* 699 * Do an nfs setattr rpc. 700 */ 701 static int 702 nfs_setattrrpc(vp, vap, cred, procp) 703 register struct vnode *vp; 704 register struct vattr *vap; 705 struct ucred *cred; 706 struct proc *procp; 707 { 708 register struct nfsv2_sattr *sp; 709 register caddr_t cp; 710 register int32_t t1, t2; 711 caddr_t bpos, dpos, cp2; 712 u_int32_t *tl; 713 int error = 0, wccflag = NFSV3_WCCRATTR; 714 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 715 int v3 = NFS_ISV3(vp); 716 717 nfsstats.rpccnt[NFSPROC_SETATTR]++; 718 nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 719 nfsm_fhtom(vp, v3); 720 if (v3) { 721 nfsm_v3attrbuild(vap, TRUE); 722 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 723 *tl = nfs_false; 724 } else { 725 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 726 if (vap->va_mode == (mode_t)VNOVAL) 727 sp->sa_mode = nfs_xdrneg1; 728 else 729 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 730 if (vap->va_uid == (uid_t)VNOVAL) 731 sp->sa_uid = nfs_xdrneg1; 732 else 733 sp->sa_uid = txdr_unsigned(vap->va_uid); 734 if (vap->va_gid == (gid_t)VNOVAL) 735 sp->sa_gid = nfs_xdrneg1; 736 else 737 sp->sa_gid = txdr_unsigned(vap->va_gid); 738 sp->sa_size = txdr_unsigned(vap->va_size); 739 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 740 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 741 } 742 nfsm_request(vp, NFSPROC_SETATTR, procp, cred); 743 if (v3) { 744 nfsm_wcc_data(vp, wccflag); 745 } else 746 nfsm_loadattr(vp, (struct vattr *)0); 747 nfsm_reqdone; 748 return (error); 749 } 750 751 /* 752 * nfs lookup call, one step at a time... 753 * First look in cache 754 * If not found, unlock the directory nfsnode and do the rpc 755 */ 756 static int 757 nfs_lookup(ap) 758 struct vop_lookup_args /* { 759 struct vnodeop_desc *a_desc; 760 struct vnode *a_dvp; 761 struct vnode **a_vpp; 762 struct componentname *a_cnp; 763 } */ *ap; 764 { 765 struct componentname *cnp = ap->a_cnp; 766 struct vnode *dvp = ap->a_dvp; 767 struct vnode **vpp = ap->a_vpp; 768 int flags = cnp->cn_flags; 769 struct vnode *newvp; 770 u_int32_t *tl; 771 caddr_t cp; 772 int32_t t1, t2; 773 struct nfsmount *nmp; 774 caddr_t bpos, dpos, cp2; 775 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 776 long len; 777 nfsfh_t *fhp; 778 struct nfsnode *np; 779 int lockparent, wantparent, error = 0, attrflag, fhsize; 780 int v3 = NFS_ISV3(dvp); 781 struct proc *p = cnp->cn_proc; 782 783 *vpp = NULLVP; 784 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 785 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 786 return (EROFS); 787 if (dvp->v_type != VDIR) 788 return (ENOTDIR); 789 lockparent = flags & LOCKPARENT; 790 wantparent = flags & (LOCKPARENT|WANTPARENT); 791 nmp = VFSTONFS(dvp->v_mount); 792 np = VTONFS(dvp); 793 if ((error = cache_lookup(dvp, vpp, cnp)) && error != ENOENT) { 794 struct vattr vattr; 795 int vpid; 796 797 if (error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, p)) { 798 *vpp = NULLVP; 799 return (error); 800 } 801 802 newvp = *vpp; 803 vpid = newvp->v_id; 804 /* 805 * See the comment starting `Step through' in ufs/ufs_lookup.c 806 * for an explanation of the locking protocol 807 */ 808 if (dvp == newvp) { 809 VREF(newvp); 810 error = 0; 811 } else if (flags & ISDOTDOT) { 812 VOP_UNLOCK(dvp, 0, p); 813 error = vget(newvp, LK_EXCLUSIVE, p); 814 if (!error && lockparent && (flags & ISLASTCN)) 815 error = vn_lock(dvp, LK_EXCLUSIVE, p); 816 } else { 817 error = vget(newvp, LK_EXCLUSIVE, p); 818 if (!lockparent || error || !(flags & ISLASTCN)) 819 VOP_UNLOCK(dvp, 0, p); 820 } 821 if (!error) { 822 if (vpid == newvp->v_id) { 823 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, p) 824 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 825 nfsstats.lookupcache_hits++; 826 if (cnp->cn_nameiop != LOOKUP && 827 (flags & ISLASTCN)) 828 cnp->cn_flags |= SAVENAME; 829 return (0); 830 } 831 cache_purge(newvp); 832 } 833 vput(newvp); 834 if (lockparent && dvp != newvp && (flags & ISLASTCN)) 835 VOP_UNLOCK(dvp, 0, p); 836 } 837 error = vn_lock(dvp, LK_EXCLUSIVE, p); 838 *vpp = NULLVP; 839 if (error) 840 return (error); 841 } 842 error = 0; 843 newvp = NULLVP; 844 nfsstats.lookupcache_misses++; 845 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 846 len = cnp->cn_namelen; 847 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 848 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 849 nfsm_fhtom(dvp, v3); 850 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 851 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_proc, cnp->cn_cred); 852 if (error) { 853 nfsm_postop_attr(dvp, attrflag); 854 m_freem(mrep); 855 goto nfsmout; 856 } 857 nfsm_getfh(fhp, fhsize, v3); 858 859 /* 860 * Handle RENAME case... 861 */ 862 if (cnp->cn_nameiop == RENAME && wantparent && (flags & ISLASTCN)) { 863 if (NFS_CMPFH(np, fhp, fhsize)) { 864 m_freem(mrep); 865 return (EISDIR); 866 } 867 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 868 if (error) { 869 m_freem(mrep); 870 return (error); 871 } 872 newvp = NFSTOV(np); 873 if (v3) { 874 nfsm_postop_attr(newvp, attrflag); 875 nfsm_postop_attr(dvp, attrflag); 876 } else 877 nfsm_loadattr(newvp, (struct vattr *)0); 878 *vpp = newvp; 879 m_freem(mrep); 880 cnp->cn_flags |= SAVENAME; 881 if (!lockparent) 882 VOP_UNLOCK(dvp, 0, p); 883 return (0); 884 } 885 886 if (flags & ISDOTDOT) { 887 VOP_UNLOCK(dvp, 0, p); 888 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 889 if (error) { 890 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, p); 891 return (error); 892 } 893 newvp = NFSTOV(np); 894 if (lockparent && (flags & ISLASTCN) && 895 (error = vn_lock(dvp, LK_EXCLUSIVE, p))) { 896 vput(newvp); 897 return (error); 898 } 899 } else if (NFS_CMPFH(np, fhp, fhsize)) { 900 VREF(dvp); 901 newvp = dvp; 902 } else { 903 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 904 if (error) { 905 m_freem(mrep); 906 return (error); 907 } 908 if (!lockparent || !(flags & ISLASTCN)) 909 VOP_UNLOCK(dvp, 0, p); 910 newvp = NFSTOV(np); 911 } 912 if (v3) { 913 nfsm_postop_attr(newvp, attrflag); 914 nfsm_postop_attr(dvp, attrflag); 915 } else 916 nfsm_loadattr(newvp, (struct vattr *)0); 917 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 918 cnp->cn_flags |= SAVENAME; 919 if ((cnp->cn_flags & MAKEENTRY) && 920 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) { 921 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 922 cache_enter(dvp, newvp, cnp); 923 } 924 *vpp = newvp; 925 nfsm_reqdone; 926 if (error) { 927 if (newvp != NULLVP) { 928 vrele(newvp); 929 *vpp = NULLVP; 930 } 931 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 932 (flags & ISLASTCN) && error == ENOENT) { 933 if (!lockparent) 934 VOP_UNLOCK(dvp, 0, p); 935 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 936 error = EROFS; 937 else 938 error = EJUSTRETURN; 939 } 940 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 941 cnp->cn_flags |= SAVENAME; 942 } 943 return (error); 944 } 945 946 /* 947 * nfs read call. 948 * Just call nfs_bioread() to do the work. 949 */ 950 static int 951 nfs_read(ap) 952 struct vop_read_args /* { 953 struct vnode *a_vp; 954 struct uio *a_uio; 955 int a_ioflag; 956 struct ucred *a_cred; 957 } */ *ap; 958 { 959 register struct vnode *vp = ap->a_vp; 960 961 if (vp->v_type != VREG) 962 return (EPERM); 963 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred, 0)); 964 } 965 966 /* 967 * nfs readlink call 968 */ 969 static int 970 nfs_readlink(ap) 971 struct vop_readlink_args /* { 972 struct vnode *a_vp; 973 struct uio *a_uio; 974 struct ucred *a_cred; 975 } */ *ap; 976 { 977 register struct vnode *vp = ap->a_vp; 978 979 if (vp->v_type != VLNK) 980 return (EINVAL); 981 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred, 0)); 982 } 983 984 /* 985 * Do a readlink rpc. 986 * Called by nfs_doio() from below the buffer cache. 987 */ 988 int 989 nfs_readlinkrpc(vp, uiop, cred) 990 register struct vnode *vp; 991 struct uio *uiop; 992 struct ucred *cred; 993 { 994 register u_int32_t *tl; 995 register caddr_t cp; 996 register int32_t t1, t2; 997 caddr_t bpos, dpos, cp2; 998 int error = 0, len, attrflag; 999 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1000 int v3 = NFS_ISV3(vp); 1001 1002 nfsstats.rpccnt[NFSPROC_READLINK]++; 1003 nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 1004 nfsm_fhtom(vp, v3); 1005 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_procp, cred); 1006 if (v3) 1007 nfsm_postop_attr(vp, attrflag); 1008 if (!error) { 1009 nfsm_strsiz(len, NFS_MAXPATHLEN); 1010 if (len == NFS_MAXPATHLEN) { 1011 struct nfsnode *np = VTONFS(vp); 1012 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1013 len = np->n_size; 1014 } 1015 nfsm_mtouio(uiop, len); 1016 } 1017 nfsm_reqdone; 1018 return (error); 1019 } 1020 1021 /* 1022 * nfs read rpc call 1023 * Ditto above 1024 */ 1025 int 1026 nfs_readrpc(vp, uiop, cred) 1027 register struct vnode *vp; 1028 struct uio *uiop; 1029 struct ucred *cred; 1030 { 1031 register u_int32_t *tl; 1032 register caddr_t cp; 1033 register int32_t t1, t2; 1034 caddr_t bpos, dpos, cp2; 1035 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1036 struct nfsmount *nmp; 1037 int error = 0, len, retlen, tsiz, eof, attrflag; 1038 int v3 = NFS_ISV3(vp); 1039 1040 #ifndef nolint 1041 eof = 0; 1042 #endif 1043 nmp = VFSTONFS(vp->v_mount); 1044 tsiz = uiop->uio_resid; 1045 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1046 return (EFBIG); 1047 while (tsiz > 0) { 1048 nfsstats.rpccnt[NFSPROC_READ]++; 1049 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1050 nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1051 nfsm_fhtom(vp, v3); 1052 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); 1053 if (v3) { 1054 txdr_hyper(&uiop->uio_offset, tl); 1055 *(tl + 2) = txdr_unsigned(len); 1056 } else { 1057 *tl++ = txdr_unsigned(uiop->uio_offset); 1058 *tl++ = txdr_unsigned(len); 1059 *tl = 0; 1060 } 1061 nfsm_request(vp, NFSPROC_READ, uiop->uio_procp, cred); 1062 if (v3) { 1063 nfsm_postop_attr(vp, attrflag); 1064 if (error) { 1065 m_freem(mrep); 1066 goto nfsmout; 1067 } 1068 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1069 eof = fxdr_unsigned(int, *(tl + 1)); 1070 } else 1071 nfsm_loadattr(vp, (struct vattr *)0); 1072 nfsm_strsiz(retlen, nmp->nm_rsize); 1073 nfsm_mtouio(uiop, retlen); 1074 m_freem(mrep); 1075 tsiz -= retlen; 1076 if (v3) { 1077 if (eof || retlen == 0) 1078 tsiz = 0; 1079 } else if (retlen < len) 1080 tsiz = 0; 1081 } 1082 nfsmout: 1083 return (error); 1084 } 1085 1086 /* 1087 * nfs write call 1088 */ 1089 int 1090 nfs_writerpc(vp, uiop, cred, iomode, must_commit) 1091 register struct vnode *vp; 1092 register struct uio *uiop; 1093 struct ucred *cred; 1094 int *iomode, *must_commit; 1095 { 1096 register u_int32_t *tl; 1097 register caddr_t cp; 1098 register int32_t t1, t2, backup; 1099 caddr_t bpos, dpos, cp2; 1100 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1101 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1102 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1103 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1104 1105 #ifndef DIAGNOSTIC 1106 if (uiop->uio_iovcnt != 1) 1107 panic("nfs: writerpc iovcnt > 1"); 1108 #endif 1109 *must_commit = 0; 1110 tsiz = uiop->uio_resid; 1111 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1112 return (EFBIG); 1113 while (tsiz > 0) { 1114 nfsstats.rpccnt[NFSPROC_WRITE]++; 1115 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 1116 nfsm_reqhead(vp, NFSPROC_WRITE, 1117 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1118 nfsm_fhtom(vp, v3); 1119 if (v3) { 1120 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1121 txdr_hyper(&uiop->uio_offset, tl); 1122 tl += 2; 1123 *tl++ = txdr_unsigned(len); 1124 *tl++ = txdr_unsigned(*iomode); 1125 *tl = txdr_unsigned(len); 1126 } else { 1127 register u_int32_t x; 1128 1129 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 1130 /* Set both "begin" and "current" to non-garbage. */ 1131 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1132 *tl++ = x; /* "begin offset" */ 1133 *tl++ = x; /* "current offset" */ 1134 x = txdr_unsigned(len); 1135 *tl++ = x; /* total to this offset */ 1136 *tl = x; /* size of this write */ 1137 } 1138 nfsm_uiotom(uiop, len); 1139 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_procp, cred); 1140 if (v3) { 1141 wccflag = NFSV3_WCCCHK; 1142 nfsm_wcc_data(vp, wccflag); 1143 if (!error) { 1144 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED 1145 + NFSX_V3WRITEVERF); 1146 rlen = fxdr_unsigned(int, *tl++); 1147 if (rlen == 0) { 1148 error = NFSERR_IO; 1149 m_freem(mrep); 1150 break; 1151 } else if (rlen < len) { 1152 backup = len - rlen; 1153 uiop->uio_iov->iov_base -= backup; 1154 uiop->uio_iov->iov_len += backup; 1155 uiop->uio_offset -= backup; 1156 uiop->uio_resid += backup; 1157 len = rlen; 1158 } 1159 commit = fxdr_unsigned(int, *tl++); 1160 1161 /* 1162 * Return the lowest committment level 1163 * obtained by any of the RPCs. 1164 */ 1165 if (committed == NFSV3WRITE_FILESYNC) 1166 committed = commit; 1167 else if (committed == NFSV3WRITE_DATASYNC && 1168 commit == NFSV3WRITE_UNSTABLE) 1169 committed = commit; 1170 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1171 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1172 NFSX_V3WRITEVERF); 1173 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1174 } else if (bcmp((caddr_t)tl, 1175 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1176 *must_commit = 1; 1177 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1178 NFSX_V3WRITEVERF); 1179 } 1180 } 1181 } else 1182 nfsm_loadattr(vp, (struct vattr *)0); 1183 if (wccflag) 1184 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime.tv_sec; 1185 m_freem(mrep); 1186 if (error) 1187 break; 1188 tsiz -= len; 1189 } 1190 nfsmout: 1191 if (vp->v_mount->mnt_flag & MNT_ASYNC) 1192 committed = NFSV3WRITE_FILESYNC; 1193 *iomode = committed; 1194 if (error) 1195 uiop->uio_resid = tsiz; 1196 return (error); 1197 } 1198 1199 /* 1200 * nfs mknod rpc 1201 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1202 * mode set to specify the file type and the size field for rdev. 1203 */ 1204 static int 1205 nfs_mknodrpc(dvp, vpp, cnp, vap) 1206 register struct vnode *dvp; 1207 register struct vnode **vpp; 1208 register struct componentname *cnp; 1209 register struct vattr *vap; 1210 { 1211 register struct nfsv2_sattr *sp; 1212 register u_int32_t *tl; 1213 register caddr_t cp; 1214 register int32_t t1, t2; 1215 struct vnode *newvp = (struct vnode *)0; 1216 struct nfsnode *np = (struct nfsnode *)0; 1217 struct vattr vattr; 1218 char *cp2; 1219 caddr_t bpos, dpos; 1220 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1221 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1222 u_int32_t rdev; 1223 int v3 = NFS_ISV3(dvp); 1224 1225 if (vap->va_type == VCHR || vap->va_type == VBLK) 1226 rdev = txdr_unsigned(vap->va_rdev); 1227 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1228 rdev = nfs_xdrneg1; 1229 else { 1230 VOP_ABORTOP(dvp, cnp); 1231 return (EOPNOTSUPP); 1232 } 1233 if (error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_proc)) { 1234 VOP_ABORTOP(dvp, cnp); 1235 return (error); 1236 } 1237 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1238 nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1239 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1240 nfsm_fhtom(dvp, v3); 1241 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1242 if (v3) { 1243 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1244 *tl++ = vtonfsv3_type(vap->va_type); 1245 nfsm_v3attrbuild(vap, FALSE); 1246 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1247 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1248 *tl++ = txdr_unsigned(major(vap->va_rdev)); 1249 *tl = txdr_unsigned(minor(vap->va_rdev)); 1250 } 1251 } else { 1252 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1253 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1254 sp->sa_uid = nfs_xdrneg1; 1255 sp->sa_gid = nfs_xdrneg1; 1256 sp->sa_size = rdev; 1257 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1258 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1259 } 1260 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_proc, cnp->cn_cred); 1261 if (!error) { 1262 nfsm_mtofh(dvp, newvp, v3, gotvp); 1263 if (!gotvp) { 1264 if (newvp) { 1265 vput(newvp); 1266 newvp = (struct vnode *)0; 1267 } 1268 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1269 cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc, &np); 1270 if (!error) 1271 newvp = NFSTOV(np); 1272 } 1273 } 1274 if (v3) 1275 nfsm_wcc_data(dvp, wccflag); 1276 nfsm_reqdone; 1277 if (error) { 1278 if (newvp) 1279 vput(newvp); 1280 } else { 1281 if (cnp->cn_flags & MAKEENTRY) 1282 cache_enter(dvp, newvp, cnp); 1283 *vpp = newvp; 1284 } 1285 zfree(namei_zone, cnp->cn_pnbuf); 1286 VTONFS(dvp)->n_flag |= NMODIFIED; 1287 if (!wccflag) 1288 VTONFS(dvp)->n_attrstamp = 0; 1289 return (error); 1290 } 1291 1292 /* 1293 * nfs mknod vop 1294 * just call nfs_mknodrpc() to do the work. 1295 */ 1296 /* ARGSUSED */ 1297 static int 1298 nfs_mknod(ap) 1299 struct vop_mknod_args /* { 1300 struct vnode *a_dvp; 1301 struct vnode **a_vpp; 1302 struct componentname *a_cnp; 1303 struct vattr *a_vap; 1304 } */ *ap; 1305 { 1306 struct vnode *newvp; 1307 int error; 1308 1309 error = nfs_mknodrpc(ap->a_dvp, &newvp, ap->a_cnp, ap->a_vap); 1310 if (!error) 1311 vput(newvp); 1312 return (error); 1313 } 1314 1315 static u_long create_verf; 1316 /* 1317 * nfs file create call 1318 */ 1319 static int 1320 nfs_create(ap) 1321 struct vop_create_args /* { 1322 struct vnode *a_dvp; 1323 struct vnode **a_vpp; 1324 struct componentname *a_cnp; 1325 struct vattr *a_vap; 1326 } */ *ap; 1327 { 1328 register struct vnode *dvp = ap->a_dvp; 1329 register struct vattr *vap = ap->a_vap; 1330 register struct componentname *cnp = ap->a_cnp; 1331 register struct nfsv2_sattr *sp; 1332 register u_int32_t *tl; 1333 register caddr_t cp; 1334 register int32_t t1, t2; 1335 struct nfsnode *np = (struct nfsnode *)0; 1336 struct vnode *newvp = (struct vnode *)0; 1337 caddr_t bpos, dpos, cp2; 1338 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1339 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1340 struct vattr vattr; 1341 int v3 = NFS_ISV3(dvp); 1342 1343 /* 1344 * Oops, not for me.. 1345 */ 1346 if (vap->va_type == VSOCK) 1347 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1348 1349 if (error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_proc)) { 1350 VOP_ABORTOP(dvp, cnp); 1351 return (error); 1352 } 1353 if (vap->va_vaflags & VA_EXCLUSIVE) 1354 fmode |= O_EXCL; 1355 again: 1356 nfsstats.rpccnt[NFSPROC_CREATE]++; 1357 nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1358 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1359 nfsm_fhtom(dvp, v3); 1360 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1361 if (v3) { 1362 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1363 if (fmode & O_EXCL) { 1364 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1365 nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF); 1366 #ifdef INET 1367 if (!TAILQ_EMPTY(&in_ifaddrhead)) 1368 *tl++ = IA_SIN(in_ifaddrhead.tqh_first)->sin_addr.s_addr; 1369 else 1370 #endif 1371 *tl++ = create_verf; 1372 *tl = ++create_verf; 1373 } else { 1374 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1375 nfsm_v3attrbuild(vap, FALSE); 1376 } 1377 } else { 1378 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1379 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1380 sp->sa_uid = nfs_xdrneg1; 1381 sp->sa_gid = nfs_xdrneg1; 1382 sp->sa_size = 0; 1383 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1384 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1385 } 1386 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_proc, cnp->cn_cred); 1387 if (!error) { 1388 nfsm_mtofh(dvp, newvp, v3, gotvp); 1389 if (!gotvp) { 1390 if (newvp) { 1391 vput(newvp); 1392 newvp = (struct vnode *)0; 1393 } 1394 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1395 cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc, &np); 1396 if (!error) 1397 newvp = NFSTOV(np); 1398 } 1399 } 1400 if (v3) 1401 nfsm_wcc_data(dvp, wccflag); 1402 nfsm_reqdone; 1403 if (error) { 1404 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1405 fmode &= ~O_EXCL; 1406 goto again; 1407 } 1408 if (newvp) 1409 vput(newvp); 1410 } else if (v3 && (fmode & O_EXCL)) { 1411 /* 1412 * We are normally called with only a partially initialized 1413 * VAP. Since the NFSv3 spec says that server may use the 1414 * file attributes to store the verifier, the spec requires 1415 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1416 * in atime, but we can't really assume that all servers will 1417 * so we ensure that our SETATTR sets both atime and mtime. 1418 */ 1419 if (vap->va_mtime.tv_sec == VNOVAL) 1420 getnanotime(&vap->va_mtime); 1421 if (vap->va_atime.tv_sec == VNOVAL) 1422 vap->va_atime = vap->va_mtime; 1423 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_proc); 1424 } 1425 if (!error) { 1426 if (cnp->cn_flags & MAKEENTRY) 1427 cache_enter(dvp, newvp, cnp); 1428 *ap->a_vpp = newvp; 1429 } 1430 zfree(namei_zone, cnp->cn_pnbuf); 1431 VTONFS(dvp)->n_flag |= NMODIFIED; 1432 if (!wccflag) 1433 VTONFS(dvp)->n_attrstamp = 0; 1434 return (error); 1435 } 1436 1437 /* 1438 * nfs file remove call 1439 * To try and make nfs semantics closer to ufs semantics, a file that has 1440 * other processes using the vnode is renamed instead of removed and then 1441 * removed later on the last close. 1442 * - If v_usecount > 1 1443 * If a rename is not already in the works 1444 * call nfs_sillyrename() to set it up 1445 * else 1446 * do the remove rpc 1447 */ 1448 static int 1449 nfs_remove(ap) 1450 struct vop_remove_args /* { 1451 struct vnodeop_desc *a_desc; 1452 struct vnode * a_dvp; 1453 struct vnode * a_vp; 1454 struct componentname * a_cnp; 1455 } */ *ap; 1456 { 1457 register struct vnode *vp = ap->a_vp; 1458 register struct vnode *dvp = ap->a_dvp; 1459 register struct componentname *cnp = ap->a_cnp; 1460 register struct nfsnode *np = VTONFS(vp); 1461 int error = 0; 1462 struct vattr vattr; 1463 1464 #ifndef DIAGNOSTIC 1465 if ((cnp->cn_flags & HASBUF) == 0) 1466 panic("nfs_remove: no name"); 1467 if (vp->v_usecount < 1) 1468 panic("nfs_remove: bad v_usecount"); 1469 #endif 1470 if (vp->v_type == VDIR) 1471 error = EPERM; 1472 else if (vp->v_usecount == 1 || (np->n_sillyrename && 1473 VOP_GETATTR(vp, &vattr, cnp->cn_cred, cnp->cn_proc) == 0 && 1474 vattr.va_nlink > 1)) { 1475 /* 1476 * Purge the name cache so that the chance of a lookup for 1477 * the name succeeding while the remove is in progress is 1478 * minimized. Without node locking it can still happen, such 1479 * that an I/O op returns ESTALE, but since you get this if 1480 * another host removes the file.. 1481 */ 1482 cache_purge(vp); 1483 /* 1484 * throw away biocache buffers, mainly to avoid 1485 * unnecessary delayed writes later. 1486 */ 1487 error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, cnp->cn_proc, 1); 1488 /* Do the rpc */ 1489 if (error != EINTR) 1490 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1491 cnp->cn_namelen, cnp->cn_cred, cnp->cn_proc); 1492 /* 1493 * Kludge City: If the first reply to the remove rpc is lost.. 1494 * the reply to the retransmitted request will be ENOENT 1495 * since the file was in fact removed 1496 * Therefore, we cheat and return success. 1497 */ 1498 if (error == ENOENT) 1499 error = 0; 1500 } else if (!np->n_sillyrename) 1501 error = nfs_sillyrename(dvp, vp, cnp); 1502 zfree(namei_zone, cnp->cn_pnbuf); 1503 np->n_attrstamp = 0; 1504 return (error); 1505 } 1506 1507 /* 1508 * nfs file remove rpc called from nfs_inactive 1509 */ 1510 int 1511 nfs_removeit(sp) 1512 register struct sillyrename *sp; 1513 { 1514 1515 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1516 (struct proc *)0)); 1517 } 1518 1519 /* 1520 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1521 */ 1522 static int 1523 nfs_removerpc(dvp, name, namelen, cred, proc) 1524 register struct vnode *dvp; 1525 const char *name; 1526 int namelen; 1527 struct ucred *cred; 1528 struct proc *proc; 1529 { 1530 register u_int32_t *tl; 1531 register caddr_t cp; 1532 register int32_t t1, t2; 1533 caddr_t bpos, dpos, cp2; 1534 int error = 0, wccflag = NFSV3_WCCRATTR; 1535 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1536 int v3 = NFS_ISV3(dvp); 1537 1538 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1539 nfsm_reqhead(dvp, NFSPROC_REMOVE, 1540 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1541 nfsm_fhtom(dvp, v3); 1542 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1543 nfsm_request(dvp, NFSPROC_REMOVE, proc, cred); 1544 if (v3) 1545 nfsm_wcc_data(dvp, wccflag); 1546 nfsm_reqdone; 1547 VTONFS(dvp)->n_flag |= NMODIFIED; 1548 if (!wccflag) 1549 VTONFS(dvp)->n_attrstamp = 0; 1550 return (error); 1551 } 1552 1553 /* 1554 * nfs file rename call 1555 */ 1556 static int 1557 nfs_rename(ap) 1558 struct vop_rename_args /* { 1559 struct vnode *a_fdvp; 1560 struct vnode *a_fvp; 1561 struct componentname *a_fcnp; 1562 struct vnode *a_tdvp; 1563 struct vnode *a_tvp; 1564 struct componentname *a_tcnp; 1565 } */ *ap; 1566 { 1567 register struct vnode *fvp = ap->a_fvp; 1568 register struct vnode *tvp = ap->a_tvp; 1569 register struct vnode *fdvp = ap->a_fdvp; 1570 register struct vnode *tdvp = ap->a_tdvp; 1571 register struct componentname *tcnp = ap->a_tcnp; 1572 register struct componentname *fcnp = ap->a_fcnp; 1573 int error; 1574 1575 #ifndef DIAGNOSTIC 1576 if ((tcnp->cn_flags & HASBUF) == 0 || 1577 (fcnp->cn_flags & HASBUF) == 0) 1578 panic("nfs_rename: no name"); 1579 #endif 1580 /* Check for cross-device rename */ 1581 if ((fvp->v_mount != tdvp->v_mount) || 1582 (tvp && (fvp->v_mount != tvp->v_mount))) { 1583 error = EXDEV; 1584 goto out; 1585 } 1586 1587 /* 1588 * We have to flush B_DELWRI data prior to renaming 1589 * the file. If we don't, the delayed-write buffers 1590 * can be flushed out later after the file has gone stale 1591 * under NFSV3. NFSV2 does not have this problem because 1592 * ( as far as I can tell ) it flushes dirty buffers more 1593 * often. 1594 */ 1595 1596 VOP_FSYNC(fvp, fcnp->cn_cred, MNT_WAIT, fcnp->cn_proc); 1597 if (tvp) 1598 VOP_FSYNC(tvp, tcnp->cn_cred, MNT_WAIT, tcnp->cn_proc); 1599 1600 /* 1601 * If the tvp exists and is in use, sillyrename it before doing the 1602 * rename of the new file over it. 1603 * XXX Can't sillyrename a directory. 1604 */ 1605 if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename && 1606 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1607 vput(tvp); 1608 tvp = NULL; 1609 } 1610 1611 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1612 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1613 tcnp->cn_proc); 1614 1615 if (fvp->v_type == VDIR) { 1616 if (tvp != NULL && tvp->v_type == VDIR) 1617 cache_purge(tdvp); 1618 cache_purge(fdvp); 1619 } 1620 1621 out: 1622 if (tdvp == tvp) 1623 vrele(tdvp); 1624 else 1625 vput(tdvp); 1626 if (tvp) 1627 vput(tvp); 1628 vrele(fdvp); 1629 vrele(fvp); 1630 /* 1631 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1632 */ 1633 if (error == ENOENT) 1634 error = 0; 1635 return (error); 1636 } 1637 1638 /* 1639 * nfs file rename rpc called from nfs_remove() above 1640 */ 1641 static int 1642 nfs_renameit(sdvp, scnp, sp) 1643 struct vnode *sdvp; 1644 struct componentname *scnp; 1645 register struct sillyrename *sp; 1646 { 1647 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 1648 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_proc)); 1649 } 1650 1651 /* 1652 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1653 */ 1654 static int 1655 nfs_renamerpc(fdvp, fnameptr, fnamelen, tdvp, tnameptr, tnamelen, cred, proc) 1656 register struct vnode *fdvp; 1657 const char *fnameptr; 1658 int fnamelen; 1659 register struct vnode *tdvp; 1660 const char *tnameptr; 1661 int tnamelen; 1662 struct ucred *cred; 1663 struct proc *proc; 1664 { 1665 register u_int32_t *tl; 1666 register caddr_t cp; 1667 register int32_t t1, t2; 1668 caddr_t bpos, dpos, cp2; 1669 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1670 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1671 int v3 = NFS_ISV3(fdvp); 1672 1673 nfsstats.rpccnt[NFSPROC_RENAME]++; 1674 nfsm_reqhead(fdvp, NFSPROC_RENAME, 1675 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1676 nfsm_rndup(tnamelen)); 1677 nfsm_fhtom(fdvp, v3); 1678 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1679 nfsm_fhtom(tdvp, v3); 1680 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1681 nfsm_request(fdvp, NFSPROC_RENAME, proc, cred); 1682 if (v3) { 1683 nfsm_wcc_data(fdvp, fwccflag); 1684 nfsm_wcc_data(tdvp, twccflag); 1685 } 1686 nfsm_reqdone; 1687 VTONFS(fdvp)->n_flag |= NMODIFIED; 1688 VTONFS(tdvp)->n_flag |= NMODIFIED; 1689 if (!fwccflag) 1690 VTONFS(fdvp)->n_attrstamp = 0; 1691 if (!twccflag) 1692 VTONFS(tdvp)->n_attrstamp = 0; 1693 return (error); 1694 } 1695 1696 /* 1697 * nfs hard link create call 1698 */ 1699 static int 1700 nfs_link(ap) 1701 struct vop_link_args /* { 1702 struct vnode *a_tdvp; 1703 struct vnode *a_vp; 1704 struct componentname *a_cnp; 1705 } */ *ap; 1706 { 1707 register struct vnode *vp = ap->a_vp; 1708 register struct vnode *tdvp = ap->a_tdvp; 1709 register struct componentname *cnp = ap->a_cnp; 1710 register u_int32_t *tl; 1711 register caddr_t cp; 1712 register int32_t t1, t2; 1713 caddr_t bpos, dpos, cp2; 1714 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1715 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1716 int v3; 1717 1718 if (vp->v_mount != tdvp->v_mount) { 1719 VOP_ABORTOP(tdvp, cnp); 1720 return (EXDEV); 1721 } 1722 1723 /* 1724 * Push all writes to the server, so that the attribute cache 1725 * doesn't get "out of sync" with the server. 1726 * XXX There should be a better way! 1727 */ 1728 VOP_FSYNC(vp, cnp->cn_cred, MNT_WAIT, cnp->cn_proc); 1729 1730 v3 = NFS_ISV3(vp); 1731 nfsstats.rpccnt[NFSPROC_LINK]++; 1732 nfsm_reqhead(vp, NFSPROC_LINK, 1733 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1734 nfsm_fhtom(vp, v3); 1735 nfsm_fhtom(tdvp, v3); 1736 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1737 nfsm_request(vp, NFSPROC_LINK, cnp->cn_proc, cnp->cn_cred); 1738 if (v3) { 1739 nfsm_postop_attr(vp, attrflag); 1740 nfsm_wcc_data(tdvp, wccflag); 1741 } 1742 nfsm_reqdone; 1743 zfree(namei_zone, cnp->cn_pnbuf); 1744 VTONFS(tdvp)->n_flag |= NMODIFIED; 1745 if (!attrflag) 1746 VTONFS(vp)->n_attrstamp = 0; 1747 if (!wccflag) 1748 VTONFS(tdvp)->n_attrstamp = 0; 1749 /* 1750 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 1751 */ 1752 if (error == EEXIST) 1753 error = 0; 1754 return (error); 1755 } 1756 1757 /* 1758 * nfs symbolic link create call 1759 */ 1760 static int 1761 nfs_symlink(ap) 1762 struct vop_symlink_args /* { 1763 struct vnode *a_dvp; 1764 struct vnode **a_vpp; 1765 struct componentname *a_cnp; 1766 struct vattr *a_vap; 1767 char *a_target; 1768 } */ *ap; 1769 { 1770 register struct vnode *dvp = ap->a_dvp; 1771 register struct vattr *vap = ap->a_vap; 1772 register struct componentname *cnp = ap->a_cnp; 1773 register struct nfsv2_sattr *sp; 1774 register u_int32_t *tl; 1775 register caddr_t cp; 1776 register int32_t t1, t2; 1777 caddr_t bpos, dpos, cp2; 1778 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 1779 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1780 struct vnode *newvp = (struct vnode *)0; 1781 int v3 = NFS_ISV3(dvp); 1782 1783 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 1784 slen = strlen(ap->a_target); 1785 nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 1786 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 1787 nfsm_fhtom(dvp, v3); 1788 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1789 if (v3) { 1790 nfsm_v3attrbuild(vap, FALSE); 1791 } 1792 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 1793 if (!v3) { 1794 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1795 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 1796 sp->sa_uid = nfs_xdrneg1; 1797 sp->sa_gid = nfs_xdrneg1; 1798 sp->sa_size = nfs_xdrneg1; 1799 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1800 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1801 } 1802 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_proc, cnp->cn_cred); 1803 if (v3) { 1804 if (!error) 1805 nfsm_mtofh(dvp, newvp, v3, gotvp); 1806 nfsm_wcc_data(dvp, wccflag); 1807 } 1808 nfsm_reqdone; 1809 if (newvp) 1810 vput(newvp); 1811 zfree(namei_zone, cnp->cn_pnbuf); 1812 VTONFS(dvp)->n_flag |= NMODIFIED; 1813 if (!wccflag) 1814 VTONFS(dvp)->n_attrstamp = 0; 1815 /* 1816 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 1817 */ 1818 if (error == EEXIST) 1819 error = 0; 1820 return (error); 1821 } 1822 1823 /* 1824 * nfs make dir call 1825 */ 1826 static int 1827 nfs_mkdir(ap) 1828 struct vop_mkdir_args /* { 1829 struct vnode *a_dvp; 1830 struct vnode **a_vpp; 1831 struct componentname *a_cnp; 1832 struct vattr *a_vap; 1833 } */ *ap; 1834 { 1835 register struct vnode *dvp = ap->a_dvp; 1836 register struct vattr *vap = ap->a_vap; 1837 register struct componentname *cnp = ap->a_cnp; 1838 register struct nfsv2_sattr *sp; 1839 register u_int32_t *tl; 1840 register caddr_t cp; 1841 register int32_t t1, t2; 1842 register int len; 1843 struct nfsnode *np = (struct nfsnode *)0; 1844 struct vnode *newvp = (struct vnode *)0; 1845 caddr_t bpos, dpos, cp2; 1846 int error = 0, wccflag = NFSV3_WCCRATTR; 1847 int gotvp = 0; 1848 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1849 struct vattr vattr; 1850 int v3 = NFS_ISV3(dvp); 1851 1852 if (error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_proc)) { 1853 VOP_ABORTOP(dvp, cnp); 1854 return (error); 1855 } 1856 len = cnp->cn_namelen; 1857 nfsstats.rpccnt[NFSPROC_MKDIR]++; 1858 nfsm_reqhead(dvp, NFSPROC_MKDIR, 1859 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 1860 nfsm_fhtom(dvp, v3); 1861 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1862 if (v3) { 1863 nfsm_v3attrbuild(vap, FALSE); 1864 } else { 1865 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1866 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 1867 sp->sa_uid = nfs_xdrneg1; 1868 sp->sa_gid = nfs_xdrneg1; 1869 sp->sa_size = nfs_xdrneg1; 1870 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1871 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1872 } 1873 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_proc, cnp->cn_cred); 1874 if (!error) 1875 nfsm_mtofh(dvp, newvp, v3, gotvp); 1876 if (v3) 1877 nfsm_wcc_data(dvp, wccflag); 1878 nfsm_reqdone; 1879 VTONFS(dvp)->n_flag |= NMODIFIED; 1880 if (!wccflag) 1881 VTONFS(dvp)->n_attrstamp = 0; 1882 /* 1883 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 1884 * if we can succeed in looking up the directory. 1885 */ 1886 if (error == EEXIST || (!error && !gotvp)) { 1887 if (newvp) { 1888 vrele(newvp); 1889 newvp = (struct vnode *)0; 1890 } 1891 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 1892 cnp->cn_proc, &np); 1893 if (!error) { 1894 newvp = NFSTOV(np); 1895 if (newvp->v_type != VDIR) 1896 error = EEXIST; 1897 } 1898 } 1899 if (error) { 1900 if (newvp) 1901 vrele(newvp); 1902 } else 1903 *ap->a_vpp = newvp; 1904 zfree(namei_zone, cnp->cn_pnbuf); 1905 return (error); 1906 } 1907 1908 /* 1909 * nfs remove directory call 1910 */ 1911 static int 1912 nfs_rmdir(ap) 1913 struct vop_rmdir_args /* { 1914 struct vnode *a_dvp; 1915 struct vnode *a_vp; 1916 struct componentname *a_cnp; 1917 } */ *ap; 1918 { 1919 register struct vnode *vp = ap->a_vp; 1920 register struct vnode *dvp = ap->a_dvp; 1921 register struct componentname *cnp = ap->a_cnp; 1922 register u_int32_t *tl; 1923 register caddr_t cp; 1924 register int32_t t1, t2; 1925 caddr_t bpos, dpos, cp2; 1926 int error = 0, wccflag = NFSV3_WCCRATTR; 1927 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1928 int v3 = NFS_ISV3(dvp); 1929 1930 if (dvp == vp) 1931 return (EINVAL); 1932 nfsstats.rpccnt[NFSPROC_RMDIR]++; 1933 nfsm_reqhead(dvp, NFSPROC_RMDIR, 1934 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1935 nfsm_fhtom(dvp, v3); 1936 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1937 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_proc, cnp->cn_cred); 1938 if (v3) 1939 nfsm_wcc_data(dvp, wccflag); 1940 nfsm_reqdone; 1941 zfree(namei_zone, cnp->cn_pnbuf); 1942 VTONFS(dvp)->n_flag |= NMODIFIED; 1943 if (!wccflag) 1944 VTONFS(dvp)->n_attrstamp = 0; 1945 cache_purge(dvp); 1946 cache_purge(vp); 1947 /* 1948 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 1949 */ 1950 if (error == ENOENT) 1951 error = 0; 1952 return (error); 1953 } 1954 1955 /* 1956 * nfs readdir call 1957 */ 1958 static int 1959 nfs_readdir(ap) 1960 struct vop_readdir_args /* { 1961 struct vnode *a_vp; 1962 struct uio *a_uio; 1963 struct ucred *a_cred; 1964 } */ *ap; 1965 { 1966 register struct vnode *vp = ap->a_vp; 1967 register struct nfsnode *np = VTONFS(vp); 1968 register struct uio *uio = ap->a_uio; 1969 int tresid, error; 1970 struct vattr vattr; 1971 1972 if (vp->v_type != VDIR) 1973 return (EPERM); 1974 /* 1975 * First, check for hit on the EOF offset cache 1976 */ 1977 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 1978 (np->n_flag & NMODIFIED) == 0) { 1979 if (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) { 1980 if (NQNFS_CKCACHABLE(vp, ND_READ)) { 1981 nfsstats.direofcache_hits++; 1982 return (0); 1983 } 1984 } else if (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_procp) == 0 && 1985 np->n_mtime == vattr.va_mtime.tv_sec) { 1986 nfsstats.direofcache_hits++; 1987 return (0); 1988 } 1989 } 1990 1991 /* 1992 * Call nfs_bioread() to do the real work. 1993 */ 1994 tresid = uio->uio_resid; 1995 error = nfs_bioread(vp, uio, 0, ap->a_cred, 0); 1996 1997 if (!error && uio->uio_resid == tresid) 1998 nfsstats.direofcache_misses++; 1999 return (error); 2000 } 2001 2002 /* 2003 * Readdir rpc call. 2004 * Called from below the buffer cache by nfs_doio(). 2005 */ 2006 int 2007 nfs_readdirrpc(vp, uiop, cred) 2008 struct vnode *vp; 2009 register struct uio *uiop; 2010 struct ucred *cred; 2011 2012 { 2013 register int len, left; 2014 register struct dirent *dp; 2015 register u_int32_t *tl; 2016 register caddr_t cp; 2017 register int32_t t1, t2; 2018 register nfsuint64 *cookiep; 2019 caddr_t bpos, dpos, cp2; 2020 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2021 nfsuint64 cookie; 2022 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2023 struct nfsnode *dnp = VTONFS(vp); 2024 u_quad_t fileno; 2025 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2026 int attrflag; 2027 int v3 = NFS_ISV3(vp); 2028 2029 #ifndef nolint 2030 dp = (struct dirent *)0; 2031 #endif 2032 #ifndef DIAGNOSTIC 2033 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (NFS_DIRBLKSIZ - 1)) || 2034 (uiop->uio_resid & (NFS_DIRBLKSIZ - 1))) 2035 panic("nfs readdirrpc bad uio"); 2036 #endif 2037 2038 /* 2039 * If there is no cookie, assume directory was stale. 2040 */ 2041 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2042 if (cookiep) 2043 cookie = *cookiep; 2044 else 2045 return (NFSERR_BAD_COOKIE); 2046 /* 2047 * Loop around doing readdir rpc's of size nm_readdirsize 2048 * truncated to a multiple of DIRBLKSIZ. 2049 * The stopping criteria is EOF or buffer full. 2050 */ 2051 while (more_dirs && bigenough) { 2052 nfsstats.rpccnt[NFSPROC_READDIR]++; 2053 nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 2054 NFSX_READDIR(v3)); 2055 nfsm_fhtom(vp, v3); 2056 if (v3) { 2057 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2058 *tl++ = cookie.nfsuquad[0]; 2059 *tl++ = cookie.nfsuquad[1]; 2060 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2061 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2062 } else { 2063 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2064 *tl++ = cookie.nfsuquad[0]; 2065 } 2066 *tl = txdr_unsigned(nmp->nm_readdirsize); 2067 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_procp, cred); 2068 if (v3) { 2069 nfsm_postop_attr(vp, attrflag); 2070 if (!error) { 2071 nfsm_dissect(tl, u_int32_t *, 2072 2 * NFSX_UNSIGNED); 2073 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2074 dnp->n_cookieverf.nfsuquad[1] = *tl; 2075 } else { 2076 m_freem(mrep); 2077 goto nfsmout; 2078 } 2079 } 2080 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2081 more_dirs = fxdr_unsigned(int, *tl); 2082 2083 /* loop thru the dir entries, doctoring them to 4bsd form */ 2084 while (more_dirs && bigenough) { 2085 if (v3) { 2086 nfsm_dissect(tl, u_int32_t *, 2087 3 * NFSX_UNSIGNED); 2088 fxdr_hyper(tl, &fileno); 2089 len = fxdr_unsigned(int, *(tl + 2)); 2090 } else { 2091 nfsm_dissect(tl, u_int32_t *, 2092 2 * NFSX_UNSIGNED); 2093 fileno = fxdr_unsigned(u_quad_t, *tl++); 2094 len = fxdr_unsigned(int, *tl); 2095 } 2096 if (len <= 0 || len > NFS_MAXNAMLEN) { 2097 error = EBADRPC; 2098 m_freem(mrep); 2099 goto nfsmout; 2100 } 2101 tlen = nfsm_rndup(len); 2102 if (tlen == len) 2103 tlen += 4; /* To ensure null termination */ 2104 left = DIRBLKSIZ - blksiz; 2105 if ((tlen + DIRHDSIZ) > left) { 2106 dp->d_reclen += left; 2107 uiop->uio_iov->iov_base += left; 2108 uiop->uio_iov->iov_len -= left; 2109 uiop->uio_offset += left; 2110 uiop->uio_resid -= left; 2111 blksiz = 0; 2112 } 2113 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2114 bigenough = 0; 2115 if (bigenough) { 2116 dp = (struct dirent *)uiop->uio_iov->iov_base; 2117 dp->d_fileno = (int)fileno; 2118 dp->d_namlen = len; 2119 dp->d_reclen = tlen + DIRHDSIZ; 2120 dp->d_type = DT_UNKNOWN; 2121 blksiz += dp->d_reclen; 2122 if (blksiz == DIRBLKSIZ) 2123 blksiz = 0; 2124 uiop->uio_offset += DIRHDSIZ; 2125 uiop->uio_resid -= DIRHDSIZ; 2126 uiop->uio_iov->iov_base += DIRHDSIZ; 2127 uiop->uio_iov->iov_len -= DIRHDSIZ; 2128 nfsm_mtouio(uiop, len); 2129 cp = uiop->uio_iov->iov_base; 2130 tlen -= len; 2131 *cp = '\0'; /* null terminate */ 2132 uiop->uio_iov->iov_base += tlen; 2133 uiop->uio_iov->iov_len -= tlen; 2134 uiop->uio_offset += tlen; 2135 uiop->uio_resid -= tlen; 2136 } else 2137 nfsm_adv(nfsm_rndup(len)); 2138 if (v3) { 2139 nfsm_dissect(tl, u_int32_t *, 2140 3 * NFSX_UNSIGNED); 2141 } else { 2142 nfsm_dissect(tl, u_int32_t *, 2143 2 * NFSX_UNSIGNED); 2144 } 2145 if (bigenough) { 2146 cookie.nfsuquad[0] = *tl++; 2147 if (v3) 2148 cookie.nfsuquad[1] = *tl++; 2149 } else if (v3) 2150 tl += 2; 2151 else 2152 tl++; 2153 more_dirs = fxdr_unsigned(int, *tl); 2154 } 2155 /* 2156 * If at end of rpc data, get the eof boolean 2157 */ 2158 if (!more_dirs) { 2159 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2160 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2161 } 2162 m_freem(mrep); 2163 } 2164 /* 2165 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2166 * by increasing d_reclen for the last record. 2167 */ 2168 if (blksiz > 0) { 2169 left = DIRBLKSIZ - blksiz; 2170 dp->d_reclen += left; 2171 uiop->uio_iov->iov_base += left; 2172 uiop->uio_iov->iov_len -= left; 2173 uiop->uio_offset += left; 2174 uiop->uio_resid -= left; 2175 } 2176 2177 /* 2178 * We are now either at the end of the directory or have filled the 2179 * block. 2180 */ 2181 if (bigenough) 2182 dnp->n_direofoffset = uiop->uio_offset; 2183 else { 2184 if (uiop->uio_resid > 0) 2185 printf("EEK! readdirrpc resid > 0\n"); 2186 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2187 *cookiep = cookie; 2188 } 2189 nfsmout: 2190 return (error); 2191 } 2192 2193 /* 2194 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2195 */ 2196 int 2197 nfs_readdirplusrpc(vp, uiop, cred) 2198 struct vnode *vp; 2199 register struct uio *uiop; 2200 struct ucred *cred; 2201 { 2202 register int len, left; 2203 register struct dirent *dp; 2204 register u_int32_t *tl; 2205 register caddr_t cp; 2206 register int32_t t1, t2; 2207 register struct vnode *newvp; 2208 register nfsuint64 *cookiep; 2209 caddr_t bpos, dpos, cp2, dpossav1, dpossav2; 2210 struct mbuf *mreq, *mrep, *md, *mb, *mb2, *mdsav1, *mdsav2; 2211 struct nameidata nami, *ndp = &nami; 2212 struct componentname *cnp = &ndp->ni_cnd; 2213 nfsuint64 cookie; 2214 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2215 struct nfsnode *dnp = VTONFS(vp), *np; 2216 nfsfh_t *fhp; 2217 u_quad_t fileno; 2218 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2219 int attrflag, fhsize; 2220 2221 #ifndef nolint 2222 dp = (struct dirent *)0; 2223 #endif 2224 #ifndef DIAGNOSTIC 2225 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2226 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2227 panic("nfs readdirplusrpc bad uio"); 2228 #endif 2229 ndp->ni_dvp = vp; 2230 newvp = NULLVP; 2231 2232 /* 2233 * If there is no cookie, assume directory was stale. 2234 */ 2235 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2236 if (cookiep) 2237 cookie = *cookiep; 2238 else 2239 return (NFSERR_BAD_COOKIE); 2240 /* 2241 * Loop around doing readdir rpc's of size nm_readdirsize 2242 * truncated to a multiple of DIRBLKSIZ. 2243 * The stopping criteria is EOF or buffer full. 2244 */ 2245 while (more_dirs && bigenough) { 2246 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2247 nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2248 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2249 nfsm_fhtom(vp, 1); 2250 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2251 *tl++ = cookie.nfsuquad[0]; 2252 *tl++ = cookie.nfsuquad[1]; 2253 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2254 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2255 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2256 *tl = txdr_unsigned(nmp->nm_rsize); 2257 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_procp, cred); 2258 nfsm_postop_attr(vp, attrflag); 2259 if (error) { 2260 m_freem(mrep); 2261 goto nfsmout; 2262 } 2263 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2264 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2265 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2266 more_dirs = fxdr_unsigned(int, *tl); 2267 2268 /* loop thru the dir entries, doctoring them to 4bsd form */ 2269 while (more_dirs && bigenough) { 2270 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2271 fxdr_hyper(tl, &fileno); 2272 len = fxdr_unsigned(int, *(tl + 2)); 2273 if (len <= 0 || len > NFS_MAXNAMLEN) { 2274 error = EBADRPC; 2275 m_freem(mrep); 2276 goto nfsmout; 2277 } 2278 tlen = nfsm_rndup(len); 2279 if (tlen == len) 2280 tlen += 4; /* To ensure null termination*/ 2281 left = DIRBLKSIZ - blksiz; 2282 if ((tlen + DIRHDSIZ) > left) { 2283 dp->d_reclen += left; 2284 uiop->uio_iov->iov_base += left; 2285 uiop->uio_iov->iov_len -= left; 2286 uiop->uio_offset += left; 2287 uiop->uio_resid -= left; 2288 blksiz = 0; 2289 } 2290 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2291 bigenough = 0; 2292 if (bigenough) { 2293 dp = (struct dirent *)uiop->uio_iov->iov_base; 2294 dp->d_fileno = (int)fileno; 2295 dp->d_namlen = len; 2296 dp->d_reclen = tlen + DIRHDSIZ; 2297 dp->d_type = DT_UNKNOWN; 2298 blksiz += dp->d_reclen; 2299 if (blksiz == DIRBLKSIZ) 2300 blksiz = 0; 2301 uiop->uio_offset += DIRHDSIZ; 2302 uiop->uio_resid -= DIRHDSIZ; 2303 uiop->uio_iov->iov_base += DIRHDSIZ; 2304 uiop->uio_iov->iov_len -= DIRHDSIZ; 2305 cnp->cn_nameptr = uiop->uio_iov->iov_base; 2306 cnp->cn_namelen = len; 2307 nfsm_mtouio(uiop, len); 2308 cp = uiop->uio_iov->iov_base; 2309 tlen -= len; 2310 *cp = '\0'; 2311 uiop->uio_iov->iov_base += tlen; 2312 uiop->uio_iov->iov_len -= tlen; 2313 uiop->uio_offset += tlen; 2314 uiop->uio_resid -= tlen; 2315 } else 2316 nfsm_adv(nfsm_rndup(len)); 2317 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2318 if (bigenough) { 2319 cookie.nfsuquad[0] = *tl++; 2320 cookie.nfsuquad[1] = *tl++; 2321 } else 2322 tl += 2; 2323 2324 /* 2325 * Since the attributes are before the file handle 2326 * (sigh), we must skip over the attributes and then 2327 * come back and get them. 2328 */ 2329 attrflag = fxdr_unsigned(int, *tl); 2330 if (attrflag) { 2331 dpossav1 = dpos; 2332 mdsav1 = md; 2333 nfsm_adv(NFSX_V3FATTR); 2334 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2335 doit = fxdr_unsigned(int, *tl); 2336 if (doit) { 2337 nfsm_getfh(fhp, fhsize, 1); 2338 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2339 VREF(vp); 2340 newvp = vp; 2341 np = dnp; 2342 } else { 2343 error = nfs_nget(vp->v_mount, fhp, 2344 fhsize, &np); 2345 if (error) 2346 doit = 0; 2347 else 2348 newvp = NFSTOV(np); 2349 } 2350 } 2351 if (doit && bigenough) { 2352 dpossav2 = dpos; 2353 dpos = dpossav1; 2354 mdsav2 = md; 2355 md = mdsav1; 2356 nfsm_loadattr(newvp, (struct vattr *)0); 2357 dpos = dpossav2; 2358 md = mdsav2; 2359 dp->d_type = 2360 IFTODT(VTTOIF(np->n_vattr.va_type)); 2361 ndp->ni_vp = newvp; 2362 cnp->cn_hash = 0; 2363 for (cp = cnp->cn_nameptr, i = 1; i <= len; 2364 i++, cp++) 2365 cnp->cn_hash += (unsigned char)*cp; 2366 cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp); 2367 } 2368 } else { 2369 /* Just skip over the file handle */ 2370 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2371 i = fxdr_unsigned(int, *tl); 2372 nfsm_adv(nfsm_rndup(i)); 2373 } 2374 if (newvp != NULLVP) { 2375 if (newvp == vp) 2376 vrele(newvp); 2377 else 2378 vput(newvp); 2379 newvp = NULLVP; 2380 } 2381 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2382 more_dirs = fxdr_unsigned(int, *tl); 2383 } 2384 /* 2385 * If at end of rpc data, get the eof boolean 2386 */ 2387 if (!more_dirs) { 2388 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2389 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2390 } 2391 m_freem(mrep); 2392 } 2393 /* 2394 * Fill last record, iff any, out to a multiple of NFS_DIRBLKSIZ 2395 * by increasing d_reclen for the last record. 2396 */ 2397 if (blksiz > 0) { 2398 left = DIRBLKSIZ - blksiz; 2399 dp->d_reclen += left; 2400 uiop->uio_iov->iov_base += left; 2401 uiop->uio_iov->iov_len -= left; 2402 uiop->uio_offset += left; 2403 uiop->uio_resid -= left; 2404 } 2405 2406 /* 2407 * We are now either at the end of the directory or have filled the 2408 * block. 2409 */ 2410 if (bigenough) 2411 dnp->n_direofoffset = uiop->uio_offset; 2412 else { 2413 if (uiop->uio_resid > 0) 2414 printf("EEK! readdirplusrpc resid > 0\n"); 2415 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2416 *cookiep = cookie; 2417 } 2418 nfsmout: 2419 if (newvp != NULLVP) { 2420 if (newvp == vp) 2421 vrele(newvp); 2422 else 2423 vput(newvp); 2424 newvp = NULLVP; 2425 } 2426 return (error); 2427 } 2428 2429 /* 2430 * Silly rename. To make the NFS filesystem that is stateless look a little 2431 * more like the "ufs" a remove of an active vnode is translated to a rename 2432 * to a funny looking filename that is removed by nfs_inactive on the 2433 * nfsnode. There is the potential for another process on a different client 2434 * to create the same funny name between the nfs_lookitup() fails and the 2435 * nfs_rename() completes, but... 2436 */ 2437 static int 2438 nfs_sillyrename(dvp, vp, cnp) 2439 struct vnode *dvp, *vp; 2440 struct componentname *cnp; 2441 { 2442 register struct sillyrename *sp; 2443 struct nfsnode *np; 2444 int error; 2445 short pid; 2446 2447 cache_purge(dvp); 2448 np = VTONFS(vp); 2449 #ifndef DIAGNOSTIC 2450 if (vp->v_type == VDIR) 2451 panic("nfs: sillyrename dir"); 2452 #endif 2453 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2454 M_NFSREQ, M_WAITOK); 2455 sp->s_cred = crdup(cnp->cn_cred); 2456 sp->s_dvp = dvp; 2457 VREF(dvp); 2458 2459 /* Fudge together a funny name */ 2460 pid = cnp->cn_proc->p_pid; 2461 sp->s_namlen = sprintf(sp->s_name, ".nfsA%04x4.4", pid); 2462 2463 /* Try lookitups until we get one that isn't there */ 2464 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2465 cnp->cn_proc, (struct nfsnode **)0) == 0) { 2466 sp->s_name[4]++; 2467 if (sp->s_name[4] > 'z') { 2468 error = EINVAL; 2469 goto bad; 2470 } 2471 } 2472 error = nfs_renameit(dvp, cnp, sp); 2473 if (error) 2474 goto bad; 2475 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2476 cnp->cn_proc, &np); 2477 np->n_sillyrename = sp; 2478 return (0); 2479 bad: 2480 vrele(sp->s_dvp); 2481 crfree(sp->s_cred); 2482 free((caddr_t)sp, M_NFSREQ); 2483 return (error); 2484 } 2485 2486 /* 2487 * Look up a file name and optionally either update the file handle or 2488 * allocate an nfsnode, depending on the value of npp. 2489 * npp == NULL --> just do the lookup 2490 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2491 * handled too 2492 * *npp != NULL --> update the file handle in the vnode 2493 */ 2494 static int 2495 nfs_lookitup(dvp, name, len, cred, procp, npp) 2496 register struct vnode *dvp; 2497 const char *name; 2498 int len; 2499 struct ucred *cred; 2500 struct proc *procp; 2501 struct nfsnode **npp; 2502 { 2503 register u_int32_t *tl; 2504 register caddr_t cp; 2505 register int32_t t1, t2; 2506 struct vnode *newvp = (struct vnode *)0; 2507 struct nfsnode *np, *dnp = VTONFS(dvp); 2508 caddr_t bpos, dpos, cp2; 2509 int error = 0, fhlen, attrflag; 2510 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2511 nfsfh_t *nfhp; 2512 int v3 = NFS_ISV3(dvp); 2513 2514 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2515 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2516 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2517 nfsm_fhtom(dvp, v3); 2518 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2519 nfsm_request(dvp, NFSPROC_LOOKUP, procp, cred); 2520 if (npp && !error) { 2521 nfsm_getfh(nfhp, fhlen, v3); 2522 if (*npp) { 2523 np = *npp; 2524 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2525 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2526 np->n_fhp = &np->n_fh; 2527 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2528 np->n_fhp =(nfsfh_t *)malloc(fhlen,M_NFSBIGFH,M_WAITOK); 2529 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2530 np->n_fhsize = fhlen; 2531 newvp = NFSTOV(np); 2532 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2533 VREF(dvp); 2534 newvp = dvp; 2535 } else { 2536 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2537 if (error) { 2538 m_freem(mrep); 2539 return (error); 2540 } 2541 newvp = NFSTOV(np); 2542 } 2543 if (v3) { 2544 nfsm_postop_attr(newvp, attrflag); 2545 if (!attrflag && *npp == NULL) { 2546 m_freem(mrep); 2547 if (newvp == dvp) 2548 vrele(newvp); 2549 else 2550 vput(newvp); 2551 return (ENOENT); 2552 } 2553 } else 2554 nfsm_loadattr(newvp, (struct vattr *)0); 2555 } 2556 nfsm_reqdone; 2557 if (npp && *npp == NULL) { 2558 if (error) { 2559 if (newvp) 2560 if (newvp == dvp) 2561 vrele(newvp); 2562 else 2563 vput(newvp); 2564 } else 2565 *npp = np; 2566 } 2567 return (error); 2568 } 2569 2570 /* 2571 * Nfs Version 3 commit rpc 2572 */ 2573 static int 2574 nfs_commit(vp, offset, cnt, cred, procp) 2575 register struct vnode *vp; 2576 u_quad_t offset; 2577 int cnt; 2578 struct ucred *cred; 2579 struct proc *procp; 2580 { 2581 register caddr_t cp; 2582 register u_int32_t *tl; 2583 register int32_t t1, t2; 2584 register struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2585 caddr_t bpos, dpos, cp2; 2586 int error = 0, wccflag = NFSV3_WCCRATTR; 2587 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2588 2589 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 2590 return (0); 2591 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2592 nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2593 nfsm_fhtom(vp, 1); 2594 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2595 txdr_hyper(&offset, tl); 2596 tl += 2; 2597 *tl = txdr_unsigned(cnt); 2598 nfsm_request(vp, NFSPROC_COMMIT, procp, cred); 2599 nfsm_wcc_data(vp, wccflag); 2600 if (!error) { 2601 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 2602 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2603 NFSX_V3WRITEVERF)) { 2604 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2605 NFSX_V3WRITEVERF); 2606 error = NFSERR_STALEWRITEVERF; 2607 } 2608 } 2609 nfsm_reqdone; 2610 return (error); 2611 } 2612 2613 /* 2614 * Kludge City.. 2615 * - make nfs_bmap() essentially a no-op that does no translation 2616 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 2617 * (Maybe I could use the process's page mapping, but I was concerned that 2618 * Kernel Write might not be enabled and also figured copyout() would do 2619 * a lot more work than bcopy() and also it currently happens in the 2620 * context of the swapper process (2). 2621 */ 2622 static int 2623 nfs_bmap(ap) 2624 struct vop_bmap_args /* { 2625 struct vnode *a_vp; 2626 daddr_t a_bn; 2627 struct vnode **a_vpp; 2628 daddr_t *a_bnp; 2629 int *a_runp; 2630 int *a_runb; 2631 } */ *ap; 2632 { 2633 register struct vnode *vp = ap->a_vp; 2634 2635 if (ap->a_vpp != NULL) 2636 *ap->a_vpp = vp; 2637 if (ap->a_bnp != NULL) 2638 *ap->a_bnp = ap->a_bn * btodb(vp->v_mount->mnt_stat.f_iosize); 2639 if (ap->a_runp != NULL) 2640 *ap->a_runp = 0; 2641 if (ap->a_runb != NULL) 2642 *ap->a_runb = 0; 2643 return (0); 2644 } 2645 2646 /* 2647 * Strategy routine. 2648 * For async requests when nfsiod(s) are running, queue the request by 2649 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2650 * request. 2651 */ 2652 static int 2653 nfs_strategy(ap) 2654 struct vop_strategy_args *ap; 2655 { 2656 register struct buf *bp = ap->a_bp; 2657 struct ucred *cr; 2658 struct proc *p; 2659 int error = 0; 2660 2661 if (bp->b_flags & B_PHYS) 2662 panic("nfs physio"); 2663 if (bp->b_flags & B_ASYNC) 2664 p = (struct proc *)0; 2665 else 2666 p = curproc; /* XXX */ 2667 if (bp->b_flags & B_READ) 2668 cr = bp->b_rcred; 2669 else 2670 cr = bp->b_wcred; 2671 /* 2672 * If the op is asynchronous and an i/o daemon is waiting 2673 * queue the request, wake it up and wait for completion 2674 * otherwise just do it ourselves. 2675 */ 2676 if ((bp->b_flags & B_ASYNC) == 0 || 2677 nfs_asyncio(bp, NOCRED)) 2678 error = nfs_doio(bp, cr, p); 2679 return (error); 2680 } 2681 2682 /* 2683 * Mmap a file 2684 * 2685 * NB Currently unsupported. 2686 */ 2687 /* ARGSUSED */ 2688 static int 2689 nfs_mmap(ap) 2690 struct vop_mmap_args /* { 2691 struct vnode *a_vp; 2692 int a_fflags; 2693 struct ucred *a_cred; 2694 struct proc *a_p; 2695 } */ *ap; 2696 { 2697 2698 return (EINVAL); 2699 } 2700 2701 /* 2702 * fsync vnode op. Just call nfs_flush() with commit == 1. 2703 */ 2704 /* ARGSUSED */ 2705 static int 2706 nfs_fsync(ap) 2707 struct vop_fsync_args /* { 2708 struct vnodeop_desc *a_desc; 2709 struct vnode * a_vp; 2710 struct ucred * a_cred; 2711 int a_waitfor; 2712 struct proc * a_p; 2713 } */ *ap; 2714 { 2715 2716 return (nfs_flush(ap->a_vp, ap->a_cred, ap->a_waitfor, ap->a_p, 1)); 2717 } 2718 2719 /* 2720 * Flush all the blocks associated with a vnode. 2721 * Walk through the buffer pool and push any dirty pages 2722 * associated with the vnode. 2723 */ 2724 static int 2725 nfs_flush(vp, cred, waitfor, p, commit) 2726 register struct vnode *vp; 2727 struct ucred *cred; 2728 int waitfor; 2729 struct proc *p; 2730 int commit; 2731 { 2732 register struct nfsnode *np = VTONFS(vp); 2733 register struct buf *bp; 2734 register int i; 2735 struct buf *nbp; 2736 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2737 int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2738 int passone = 1; 2739 u_quad_t off, endoff, toff; 2740 struct ucred* wcred = NULL; 2741 struct buf **bvec = NULL; 2742 #ifndef NFS_COMMITBVECSIZ 2743 #define NFS_COMMITBVECSIZ 20 2744 #endif 2745 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2746 int bvecsize = 0, bveccount; 2747 2748 if (nmp->nm_flag & NFSMNT_INT) 2749 slpflag = PCATCH; 2750 if (!commit) 2751 passone = 0; 2752 /* 2753 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2754 * server, but nas not been committed to stable storage on the server 2755 * yet. On the first pass, the byte range is worked out and the commit 2756 * rpc is done. On the second pass, nfs_writebp() is called to do the 2757 * job. 2758 */ 2759 again: 2760 off = (u_quad_t)-1; 2761 endoff = 0; 2762 bvecpos = 0; 2763 if (NFS_ISV3(vp) && commit) { 2764 s = splbio(); 2765 /* 2766 * Count up how many buffers waiting for a commit. 2767 */ 2768 bveccount = 0; 2769 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2770 nbp = TAILQ_NEXT(bp, b_vnbufs); 2771 if ((bp->b_flags & (B_BUSY | B_DELWRI | B_NEEDCOMMIT)) 2772 == (B_DELWRI | B_NEEDCOMMIT)) 2773 bveccount++; 2774 } 2775 /* 2776 * Allocate space to remember the list of bufs to commit. It is 2777 * important to use M_NOWAIT here to avoid a race with nfs_write. 2778 * If we can't get memory (for whatever reason), we will end up 2779 * committing the buffers one-by-one in the loop below. 2780 */ 2781 if (bveccount > NFS_COMMITBVECSIZ) { 2782 if (bvec != NULL && bvec != bvec_on_stack) 2783 free(bvec, M_TEMP); 2784 bvec = (struct buf **) 2785 malloc(bveccount * sizeof(struct buf *), 2786 M_TEMP, M_NOWAIT); 2787 if (bvec == NULL) { 2788 bvec = bvec_on_stack; 2789 bvecsize = NFS_COMMITBVECSIZ; 2790 } else 2791 bvecsize = bveccount; 2792 } else { 2793 bvec = bvec_on_stack; 2794 bvecsize = NFS_COMMITBVECSIZ; 2795 } 2796 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2797 nbp = TAILQ_NEXT(bp, b_vnbufs); 2798 if (bvecpos >= bvecsize) 2799 break; 2800 if ((bp->b_flags & (B_BUSY | B_DELWRI | B_NEEDCOMMIT)) 2801 != (B_DELWRI | B_NEEDCOMMIT)) 2802 continue; 2803 bremfree(bp); 2804 /* 2805 * Work out if all buffers are using the same cred 2806 * so we can deal with them all with one commit. 2807 */ 2808 if (wcred == NULL) 2809 wcred = bp->b_wcred; 2810 else if (wcred != bp->b_wcred) 2811 wcred = NOCRED; 2812 bp->b_flags |= (B_BUSY | B_WRITEINPROG); 2813 vfs_busy_pages(bp, 1); 2814 /* 2815 * A list of these buffers is kept so that the 2816 * second loop knows which buffers have actually 2817 * been committed. This is necessary, since there 2818 * may be a race between the commit rpc and new 2819 * uncommitted writes on the file. 2820 */ 2821 bvec[bvecpos++] = bp; 2822 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2823 bp->b_dirtyoff; 2824 if (toff < off) 2825 off = toff; 2826 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 2827 if (toff > endoff) 2828 endoff = toff; 2829 } 2830 splx(s); 2831 } 2832 if (bvecpos > 0) { 2833 /* 2834 * Commit data on the server, as required. 2835 * If all bufs are using the same wcred, then use that with 2836 * one call for all of them, otherwise commit each one 2837 * separately. 2838 */ 2839 if (wcred != NOCRED) 2840 retv = nfs_commit(vp, off, (int)(endoff - off), 2841 wcred, p); 2842 else { 2843 retv = 0; 2844 for (i = 0; i < bvecpos; i++) { 2845 off_t off, size; 2846 bp = bvec[i]; 2847 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2848 bp->b_dirtyoff; 2849 size = (u_quad_t)(bp->b_dirtyend 2850 - bp->b_dirtyoff); 2851 retv = nfs_commit(vp, off, (int)size, 2852 bp->b_wcred, p); 2853 if (retv) break; 2854 } 2855 } 2856 2857 if (retv == NFSERR_STALEWRITEVERF) 2858 nfs_clearcommit(vp->v_mount); 2859 /* 2860 * Now, either mark the blocks I/O done or mark the 2861 * blocks dirty, depending on whether the commit 2862 * succeeded. 2863 */ 2864 for (i = 0; i < bvecpos; i++) { 2865 bp = bvec[i]; 2866 bp->b_flags &= ~(B_NEEDCOMMIT | B_WRITEINPROG | B_CLUSTEROK); 2867 if (retv) { 2868 vfs_unbusy_pages(bp); 2869 brelse(bp); 2870 } else { 2871 s = splbio(); /* XXX check this positionning */ 2872 vp->v_numoutput++; 2873 bp->b_flags |= B_ASYNC; 2874 if (bp->b_flags & B_DELWRI) { 2875 --numdirtybuffers; 2876 if (needsbuffer) { 2877 vfs_bio_need_satisfy(); 2878 } 2879 } 2880 bp->b_flags &= ~(B_READ|B_DONE|B_ERROR|B_DELWRI); 2881 bp->b_dirtyoff = bp->b_dirtyend = 0; 2882 reassignbuf(bp, vp); 2883 splx(s); 2884 biodone(bp); 2885 } 2886 } 2887 } 2888 2889 /* 2890 * Start/do any write(s) that are required. 2891 */ 2892 loop: 2893 s = splbio(); 2894 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2895 nbp = TAILQ_NEXT(bp, b_vnbufs); 2896 if (bp->b_flags & B_BUSY) { 2897 if (waitfor != MNT_WAIT || passone) 2898 continue; 2899 bp->b_flags |= B_WANTED; 2900 error = tsleep((caddr_t)bp, slpflag | (PRIBIO + 1), 2901 "nfsfsync", slptimeo); 2902 splx(s); 2903 if (error) { 2904 if (nfs_sigintr(nmp, (struct nfsreq *)0, p)) { 2905 error = EINTR; 2906 goto done; 2907 } 2908 if (slpflag == PCATCH) { 2909 slpflag = 0; 2910 slptimeo = 2 * hz; 2911 } 2912 } 2913 goto loop; 2914 } 2915 if ((bp->b_flags & B_DELWRI) == 0) 2916 panic("nfs_fsync: not dirty"); 2917 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) 2918 continue; 2919 bremfree(bp); 2920 if (passone || !commit) 2921 bp->b_flags |= (B_BUSY|B_ASYNC); 2922 else 2923 bp->b_flags |= (B_BUSY|B_ASYNC|B_WRITEINPROG); 2924 splx(s); 2925 VOP_BWRITE(bp); 2926 goto loop; 2927 } 2928 splx(s); 2929 if (passone) { 2930 passone = 0; 2931 goto again; 2932 } 2933 if (waitfor == MNT_WAIT) { 2934 while (vp->v_numoutput) { 2935 vp->v_flag |= VBWAIT; 2936 error = tsleep((caddr_t)&vp->v_numoutput, 2937 slpflag | (PRIBIO + 1), "nfsfsync", slptimeo); 2938 if (error) { 2939 if (nfs_sigintr(nmp, (struct nfsreq *)0, p)) { 2940 error = EINTR; 2941 goto done; 2942 } 2943 if (slpflag == PCATCH) { 2944 slpflag = 0; 2945 slptimeo = 2 * hz; 2946 } 2947 } 2948 } 2949 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) && commit) { 2950 goto loop; 2951 } 2952 } 2953 if (np->n_flag & NWRITEERR) { 2954 error = np->n_error; 2955 np->n_flag &= ~NWRITEERR; 2956 } 2957 done: 2958 if (bvec != NULL && bvec != bvec_on_stack) 2959 free(bvec, M_TEMP); 2960 return (error); 2961 } 2962 2963 /* 2964 * NFS advisory byte-level locks. 2965 * Currently unsupported. 2966 */ 2967 static int 2968 nfs_advlock(ap) 2969 struct vop_advlock_args /* { 2970 struct vnode *a_vp; 2971 caddr_t a_id; 2972 int a_op; 2973 struct flock *a_fl; 2974 int a_flags; 2975 } */ *ap; 2976 { 2977 register struct nfsnode *np = VTONFS(ap->a_vp); 2978 2979 /* 2980 * The following kludge is to allow diskless support to work 2981 * until a real NFS lockd is implemented. Basically, just pretend 2982 * that this is a local lock. 2983 */ 2984 return (lf_advlock(ap, &(np->n_lockf), np->n_size)); 2985 } 2986 2987 /* 2988 * Print out the contents of an nfsnode. 2989 */ 2990 static int 2991 nfs_print(ap) 2992 struct vop_print_args /* { 2993 struct vnode *a_vp; 2994 } */ *ap; 2995 { 2996 register struct vnode *vp = ap->a_vp; 2997 register struct nfsnode *np = VTONFS(vp); 2998 2999 printf("tag VT_NFS, fileid %ld fsid 0x%lx", 3000 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3001 if (vp->v_type == VFIFO) 3002 fifo_printinfo(vp); 3003 printf("\n"); 3004 return (0); 3005 } 3006 3007 /* 3008 * Just call nfs_writebp() with the force argument set to 1. 3009 */ 3010 static int 3011 nfs_bwrite(ap) 3012 struct vop_bwrite_args /* { 3013 struct vnode *a_bp; 3014 } */ *ap; 3015 { 3016 3017 return (nfs_writebp(ap->a_bp, 1)); 3018 } 3019 3020 /* 3021 * This is a clone of vn_bwrite(), except that B_WRITEINPROG isn't set unless 3022 * the force flag is one and it also handles the B_NEEDCOMMIT flag. 3023 */ 3024 int 3025 nfs_writebp(bp, force) 3026 register struct buf *bp; 3027 int force; 3028 { 3029 int s; 3030 register int oldflags = bp->b_flags, retv = 1; 3031 off_t off; 3032 3033 if(!(bp->b_flags & B_BUSY)) 3034 panic("bwrite: buffer is not busy???"); 3035 3036 if (bp->b_flags & B_INVAL) 3037 bp->b_flags |= B_INVAL | B_NOCACHE; 3038 3039 if (bp->b_flags & B_DELWRI) { 3040 --numdirtybuffers; 3041 if (needsbuffer) 3042 vfs_bio_need_satisfy(); 3043 } 3044 s = splbio(); /* XXX check if needed */ 3045 bp->b_flags &= ~(B_READ|B_DONE|B_ERROR|B_DELWRI); 3046 3047 if ((oldflags & (B_ASYNC|B_DELWRI)) == (B_ASYNC|B_DELWRI)) { 3048 reassignbuf(bp, bp->b_vp); 3049 } 3050 3051 bp->b_vp->v_numoutput++; 3052 curproc->p_stats->p_ru.ru_oublock++; 3053 splx(s); 3054 3055 /* 3056 * If B_NEEDCOMMIT is set, a commit rpc may do the trick. If not 3057 * an actual write will have to be scheduled via. VOP_STRATEGY(). 3058 * If B_WRITEINPROG is already set, then push it with a write anyhow. 3059 */ 3060 vfs_busy_pages(bp, 1); 3061 if ((oldflags & (B_NEEDCOMMIT | B_WRITEINPROG)) == B_NEEDCOMMIT) { 3062 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff; 3063 bp->b_flags |= B_WRITEINPROG; 3064 retv = nfs_commit(bp->b_vp, off, bp->b_dirtyend-bp->b_dirtyoff, 3065 bp->b_wcred, bp->b_proc); 3066 bp->b_flags &= ~B_WRITEINPROG; 3067 if (!retv) { 3068 bp->b_dirtyoff = bp->b_dirtyend = 0; 3069 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3070 biodone(bp); 3071 } else if (retv == NFSERR_STALEWRITEVERF) 3072 nfs_clearcommit(bp->b_vp->v_mount); 3073 } 3074 if (retv) { 3075 if (force) 3076 bp->b_flags |= B_WRITEINPROG; 3077 VOP_STRATEGY(bp->b_vp, bp); 3078 } 3079 3080 if( (oldflags & B_ASYNC) == 0) { 3081 int rtval = biowait(bp); 3082 3083 if (oldflags & B_DELWRI) { 3084 s = splbio(); 3085 reassignbuf(bp, bp->b_vp); 3086 splx(s); 3087 } 3088 3089 brelse(bp); 3090 return (rtval); 3091 } 3092 3093 return (0); 3094 } 3095 3096 /* 3097 * nfs special file access vnode op. 3098 * Essentially just get vattr and then imitate iaccess() since the device is 3099 * local to the client. 3100 */ 3101 static int 3102 nfsspec_access(ap) 3103 struct vop_access_args /* { 3104 struct vnode *a_vp; 3105 int a_mode; 3106 struct ucred *a_cred; 3107 struct proc *a_p; 3108 } */ *ap; 3109 { 3110 register struct vattr *vap; 3111 register gid_t *gp; 3112 register struct ucred *cred = ap->a_cred; 3113 struct vnode *vp = ap->a_vp; 3114 mode_t mode = ap->a_mode; 3115 struct vattr vattr; 3116 register int i; 3117 int error; 3118 3119 /* 3120 * Disallow write attempts on filesystems mounted read-only; 3121 * unless the file is a socket, fifo, or a block or character 3122 * device resident on the filesystem. 3123 */ 3124 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3125 switch (vp->v_type) { 3126 case VREG: 3127 case VDIR: 3128 case VLNK: 3129 return (EROFS); 3130 default: 3131 break; 3132 } 3133 } 3134 /* 3135 * If you're the super-user, 3136 * you always get access. 3137 */ 3138 if (cred->cr_uid == 0) 3139 return (0); 3140 vap = &vattr; 3141 error = VOP_GETATTR(vp, vap, cred, ap->a_p); 3142 if (error) 3143 return (error); 3144 /* 3145 * Access check is based on only one of owner, group, public. 3146 * If not owner, then check group. If not a member of the 3147 * group, then check public access. 3148 */ 3149 if (cred->cr_uid != vap->va_uid) { 3150 mode >>= 3; 3151 gp = cred->cr_groups; 3152 for (i = 0; i < cred->cr_ngroups; i++, gp++) 3153 if (vap->va_gid == *gp) 3154 goto found; 3155 mode >>= 3; 3156 found: 3157 ; 3158 } 3159 error = (vap->va_mode & mode) == mode ? 0 : EACCES; 3160 return (error); 3161 } 3162 3163 /* 3164 * Read wrapper for special devices. 3165 */ 3166 static int 3167 nfsspec_read(ap) 3168 struct vop_read_args /* { 3169 struct vnode *a_vp; 3170 struct uio *a_uio; 3171 int a_ioflag; 3172 struct ucred *a_cred; 3173 } */ *ap; 3174 { 3175 register struct nfsnode *np = VTONFS(ap->a_vp); 3176 3177 /* 3178 * Set access flag. 3179 */ 3180 np->n_flag |= NACC; 3181 getnanotime(&np->n_atim); 3182 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap)); 3183 } 3184 3185 /* 3186 * Write wrapper for special devices. 3187 */ 3188 static int 3189 nfsspec_write(ap) 3190 struct vop_write_args /* { 3191 struct vnode *a_vp; 3192 struct uio *a_uio; 3193 int a_ioflag; 3194 struct ucred *a_cred; 3195 } */ *ap; 3196 { 3197 register struct nfsnode *np = VTONFS(ap->a_vp); 3198 3199 /* 3200 * Set update flag. 3201 */ 3202 np->n_flag |= NUPD; 3203 getnanotime(&np->n_mtim); 3204 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap)); 3205 } 3206 3207 /* 3208 * Close wrapper for special devices. 3209 * 3210 * Update the times on the nfsnode then do device close. 3211 */ 3212 static int 3213 nfsspec_close(ap) 3214 struct vop_close_args /* { 3215 struct vnode *a_vp; 3216 int a_fflag; 3217 struct ucred *a_cred; 3218 struct proc *a_p; 3219 } */ *ap; 3220 { 3221 register struct vnode *vp = ap->a_vp; 3222 register struct nfsnode *np = VTONFS(vp); 3223 struct vattr vattr; 3224 3225 if (np->n_flag & (NACC | NUPD)) { 3226 np->n_flag |= NCHG; 3227 if (vp->v_usecount == 1 && 3228 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3229 VATTR_NULL(&vattr); 3230 if (np->n_flag & NACC) 3231 vattr.va_atime = np->n_atim; 3232 if (np->n_flag & NUPD) 3233 vattr.va_mtime = np->n_mtim; 3234 (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_p); 3235 } 3236 } 3237 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 3238 } 3239 3240 /* 3241 * Read wrapper for fifos. 3242 */ 3243 static int 3244 nfsfifo_read(ap) 3245 struct vop_read_args /* { 3246 struct vnode *a_vp; 3247 struct uio *a_uio; 3248 int a_ioflag; 3249 struct ucred *a_cred; 3250 } */ *ap; 3251 { 3252 register struct nfsnode *np = VTONFS(ap->a_vp); 3253 3254 /* 3255 * Set access flag. 3256 */ 3257 np->n_flag |= NACC; 3258 getnanotime(&np->n_atim); 3259 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap)); 3260 } 3261 3262 /* 3263 * Write wrapper for fifos. 3264 */ 3265 static int 3266 nfsfifo_write(ap) 3267 struct vop_write_args /* { 3268 struct vnode *a_vp; 3269 struct uio *a_uio; 3270 int a_ioflag; 3271 struct ucred *a_cred; 3272 } */ *ap; 3273 { 3274 register struct nfsnode *np = VTONFS(ap->a_vp); 3275 3276 /* 3277 * Set update flag. 3278 */ 3279 np->n_flag |= NUPD; 3280 getnanotime(&np->n_mtim); 3281 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap)); 3282 } 3283 3284 /* 3285 * Close wrapper for fifos. 3286 * 3287 * Update the times on the nfsnode then do fifo close. 3288 */ 3289 static int 3290 nfsfifo_close(ap) 3291 struct vop_close_args /* { 3292 struct vnode *a_vp; 3293 int a_fflag; 3294 struct ucred *a_cred; 3295 struct proc *a_p; 3296 } */ *ap; 3297 { 3298 register struct vnode *vp = ap->a_vp; 3299 register struct nfsnode *np = VTONFS(vp); 3300 struct vattr vattr; 3301 struct timespec ts; 3302 3303 if (np->n_flag & (NACC | NUPD)) { 3304 getnanotime(&ts); 3305 if (np->n_flag & NACC) 3306 np->n_atim = ts; 3307 if (np->n_flag & NUPD) 3308 np->n_mtim = ts; 3309 np->n_flag |= NCHG; 3310 if (vp->v_usecount == 1 && 3311 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3312 VATTR_NULL(&vattr); 3313 if (np->n_flag & NACC) 3314 vattr.va_atime = np->n_atim; 3315 if (np->n_flag & NUPD) 3316 vattr.va_mtime = np->n_mtim; 3317 (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_p); 3318 } 3319 } 3320 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 3321 }
Cache object: 259cd001a25166c0efdebf332526ba8d
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