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sys/nfsclient/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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD: releng/5.4/sys/nfsclient/nfs_vnops.c 141090 2005-01-31 23:27:04Z imp $"); 37 38 /* 39 * vnode op calls for Sun NFS version 2 and 3 40 */ 41 42 #include "opt_inet.h" 43 44 #include <sys/param.h> 45 #include <sys/kernel.h> 46 #include <sys/systm.h> 47 #include <sys/resourcevar.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 #include <sys/bio.h> 51 #include <sys/buf.h> 52 #include <sys/malloc.h> 53 #include <sys/mbuf.h> 54 #include <sys/namei.h> 55 #include <sys/socket.h> 56 #include <sys/vnode.h> 57 #include <sys/dirent.h> 58 #include <sys/fcntl.h> 59 #include <sys/lockf.h> 60 #include <sys/stat.h> 61 #include <sys/sysctl.h> 62 63 #include <vm/vm.h> 64 #include <vm/vm_extern.h> 65 66 #include <fs/fifofs/fifo.h> 67 68 #include <rpc/rpcclnt.h> 69 70 #include <nfs/rpcv2.h> 71 #include <nfs/nfsproto.h> 72 #include <nfsclient/nfs.h> 73 #include <nfsclient/nfsnode.h> 74 #include <nfsclient/nfsmount.h> 75 #include <nfsclient/nfs_lock.h> 76 #include <nfs/xdr_subs.h> 77 #include <nfsclient/nfsm_subs.h> 78 79 #include <net/if.h> 80 #include <netinet/in.h> 81 #include <netinet/in_var.h> 82 83 /* Defs */ 84 #define TRUE 1 85 #define FALSE 0 86 87 /* 88 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these 89 * calls are not in getblk() and brelse() so that they would not be necessary 90 * here. 91 */ 92 #ifndef B_VMIO 93 #define vfs_busy_pages(bp, f) 94 #endif 95 96 static int nfsspec_read(struct vop_read_args *); 97 static int nfsspec_write(struct vop_write_args *); 98 static int nfsfifo_read(struct vop_read_args *); 99 static int nfsfifo_write(struct vop_write_args *); 100 static int nfsspec_close(struct vop_close_args *); 101 static int nfsfifo_close(struct vop_close_args *); 102 static int nfs_flush(struct vnode *, struct ucred *, int, struct thread *, 103 int); 104 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *, 105 struct thread *); 106 static int nfs_lookup(struct vop_lookup_args *); 107 static int nfs_create(struct vop_create_args *); 108 static int nfs_mknod(struct vop_mknod_args *); 109 static int nfs_open(struct vop_open_args *); 110 static int nfs_close(struct vop_close_args *); 111 static int nfs_access(struct vop_access_args *); 112 static int nfs_getattr(struct vop_getattr_args *); 113 static int nfs_setattr(struct vop_setattr_args *); 114 static int nfs_read(struct vop_read_args *); 115 static int nfs_fsync(struct vop_fsync_args *); 116 static int nfs_remove(struct vop_remove_args *); 117 static int nfs_link(struct vop_link_args *); 118 static int nfs_rename(struct vop_rename_args *); 119 static int nfs_mkdir(struct vop_mkdir_args *); 120 static int nfs_rmdir(struct vop_rmdir_args *); 121 static int nfs_symlink(struct vop_symlink_args *); 122 static int nfs_readdir(struct vop_readdir_args *); 123 static int nfs_strategy(struct vop_strategy_args *); 124 static int nfs_lookitup(struct vnode *, const char *, int, 125 struct ucred *, struct thread *, struct nfsnode **); 126 static int nfs_sillyrename(struct vnode *, struct vnode *, 127 struct componentname *); 128 static int nfsspec_access(struct vop_access_args *); 129 static int nfs_readlink(struct vop_readlink_args *); 130 static int nfs_print(struct vop_print_args *); 131 static int nfs_advlock(struct vop_advlock_args *); 132 133 /* 134 * Global vfs data structures for nfs 135 */ 136 vop_t **nfs_vnodeop_p; 137 static struct vnodeopv_entry_desc nfs_vnodeop_entries[] = { 138 { &vop_default_desc, (vop_t *) vop_defaultop }, 139 { &vop_access_desc, (vop_t *) nfs_access }, 140 { &vop_advlock_desc, (vop_t *) nfs_advlock }, 141 { &vop_close_desc, (vop_t *) nfs_close }, 142 { &vop_create_desc, (vop_t *) nfs_create }, 143 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 144 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 145 { &vop_getpages_desc, (vop_t *) nfs_getpages }, 146 { &vop_putpages_desc, (vop_t *) nfs_putpages }, 147 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 148 { &vop_lease_desc, (vop_t *) vop_null }, 149 { &vop_link_desc, (vop_t *) nfs_link }, 150 { &vop_lookup_desc, (vop_t *) nfs_lookup }, 151 { &vop_mkdir_desc, (vop_t *) nfs_mkdir }, 152 { &vop_mknod_desc, (vop_t *) nfs_mknod }, 153 { &vop_open_desc, (vop_t *) nfs_open }, 154 { &vop_print_desc, (vop_t *) nfs_print }, 155 { &vop_read_desc, (vop_t *) nfs_read }, 156 { &vop_readdir_desc, (vop_t *) nfs_readdir }, 157 { &vop_readlink_desc, (vop_t *) nfs_readlink }, 158 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 159 { &vop_remove_desc, (vop_t *) nfs_remove }, 160 { &vop_rename_desc, (vop_t *) nfs_rename }, 161 { &vop_rmdir_desc, (vop_t *) nfs_rmdir }, 162 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 163 { &vop_strategy_desc, (vop_t *) nfs_strategy }, 164 { &vop_symlink_desc, (vop_t *) nfs_symlink }, 165 { &vop_write_desc, (vop_t *) nfs_write }, 166 { NULL, NULL } 167 }; 168 static struct vnodeopv_desc nfs_vnodeop_opv_desc = 169 { &nfs_vnodeop_p, nfs_vnodeop_entries }; 170 VNODEOP_SET(nfs_vnodeop_opv_desc); 171 172 /* 173 * Special device vnode ops 174 */ 175 vop_t **spec_nfsnodeop_p; 176 static struct vnodeopv_entry_desc nfs_specop_entries[] = { 177 { &vop_default_desc, (vop_t *) spec_vnoperate }, 178 { &vop_access_desc, (vop_t *) nfsspec_access }, 179 { &vop_close_desc, (vop_t *) nfsspec_close }, 180 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 181 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 182 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 183 { &vop_print_desc, (vop_t *) nfs_print }, 184 { &vop_read_desc, (vop_t *) nfsspec_read }, 185 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 186 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 187 { &vop_write_desc, (vop_t *) nfsspec_write }, 188 { NULL, NULL } 189 }; 190 static struct vnodeopv_desc spec_nfsnodeop_opv_desc = 191 { &spec_nfsnodeop_p, nfs_specop_entries }; 192 VNODEOP_SET(spec_nfsnodeop_opv_desc); 193 194 vop_t **fifo_nfsnodeop_p; 195 static struct vnodeopv_entry_desc nfs_fifoop_entries[] = { 196 { &vop_default_desc, (vop_t *) fifo_vnoperate }, 197 { &vop_access_desc, (vop_t *) nfsspec_access }, 198 { &vop_close_desc, (vop_t *) nfsfifo_close }, 199 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 200 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 201 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 202 { &vop_print_desc, (vop_t *) nfs_print }, 203 { &vop_read_desc, (vop_t *) nfsfifo_read }, 204 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 205 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 206 { &vop_write_desc, (vop_t *) nfsfifo_write }, 207 { NULL, NULL } 208 }; 209 static struct vnodeopv_desc fifo_nfsnodeop_opv_desc = 210 { &fifo_nfsnodeop_p, nfs_fifoop_entries }; 211 VNODEOP_SET(fifo_nfsnodeop_opv_desc); 212 213 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 214 struct componentname *cnp, struct vattr *vap); 215 static int nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 216 struct ucred *cred, struct thread *td); 217 static int nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, 218 int fnamelen, struct vnode *tdvp, 219 const char *tnameptr, int tnamelen, 220 struct ucred *cred, struct thread *td); 221 static int nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 222 struct sillyrename *sp); 223 224 /* 225 * Global variables 226 */ 227 struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON]; 228 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; 229 int nfs_numasync = 0; 230 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1)) 231 232 SYSCTL_DECL(_vfs_nfs); 233 234 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 235 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 236 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 237 238 static int nfsv3_commit_on_close = 0; 239 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 240 &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); 241 #if 0 242 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 243 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 244 245 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 246 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 247 #endif 248 249 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 250 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 251 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 252 static int 253 nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td, 254 struct ucred *cred) 255 { 256 const int v3 = 1; 257 u_int32_t *tl; 258 int error = 0, attrflag; 259 260 struct mbuf *mreq, *mrep, *md, *mb; 261 caddr_t bpos, dpos; 262 u_int32_t rmode; 263 struct nfsnode *np = VTONFS(vp); 264 265 nfsstats.rpccnt[NFSPROC_ACCESS]++; 266 mreq = nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 267 mb = mreq; 268 bpos = mtod(mb, caddr_t); 269 nfsm_fhtom(vp, v3); 270 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 271 *tl = txdr_unsigned(wmode); 272 nfsm_request(vp, NFSPROC_ACCESS, td, cred); 273 nfsm_postop_attr(vp, attrflag); 274 if (!error) { 275 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 276 rmode = fxdr_unsigned(u_int32_t, *tl); 277 np->n_mode = rmode; 278 np->n_modeuid = cred->cr_uid; 279 np->n_modestamp = time_second; 280 } 281 m_freem(mrep); 282 nfsmout: 283 return (error); 284 } 285 286 /* 287 * nfs access vnode op. 288 * For nfs version 2, just return ok. File accesses may fail later. 289 * For nfs version 3, use the access rpc to check accessibility. If file modes 290 * are changed on the server, accesses might still fail later. 291 */ 292 static int 293 nfs_access(struct vop_access_args *ap) 294 { 295 struct vnode *vp = ap->a_vp; 296 int error = 0; 297 u_int32_t mode, wmode; 298 int v3 = NFS_ISV3(vp); 299 struct nfsnode *np = VTONFS(vp); 300 301 /* 302 * Disallow write attempts on filesystems mounted read-only; 303 * unless the file is a socket, fifo, or a block or character 304 * device resident on the filesystem. 305 */ 306 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 307 switch (vp->v_type) { 308 case VREG: 309 case VDIR: 310 case VLNK: 311 return (EROFS); 312 default: 313 break; 314 } 315 } 316 /* 317 * For nfs v3, check to see if we have done this recently, and if 318 * so return our cached result instead of making an ACCESS call. 319 * If not, do an access rpc, otherwise you are stuck emulating 320 * ufs_access() locally using the vattr. This may not be correct, 321 * since the server may apply other access criteria such as 322 * client uid-->server uid mapping that we do not know about. 323 */ 324 if (v3) { 325 if (ap->a_mode & VREAD) 326 mode = NFSV3ACCESS_READ; 327 else 328 mode = 0; 329 if (vp->v_type != VDIR) { 330 if (ap->a_mode & VWRITE) 331 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 332 if (ap->a_mode & VEXEC) 333 mode |= NFSV3ACCESS_EXECUTE; 334 } else { 335 if (ap->a_mode & VWRITE) 336 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 337 NFSV3ACCESS_DELETE); 338 if (ap->a_mode & VEXEC) 339 mode |= NFSV3ACCESS_LOOKUP; 340 } 341 /* XXX safety belt, only make blanket request if caching */ 342 if (nfsaccess_cache_timeout > 0) { 343 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 344 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 345 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 346 } else { 347 wmode = mode; 348 } 349 350 /* 351 * Does our cached result allow us to give a definite yes to 352 * this request? 353 */ 354 if ((time_second < (np->n_modestamp + nfsaccess_cache_timeout)) && 355 (ap->a_cred->cr_uid == np->n_modeuid) && 356 ((np->n_mode & mode) == mode)) { 357 nfsstats.accesscache_hits++; 358 } else { 359 /* 360 * Either a no, or a don't know. Go to the wire. 361 */ 362 nfsstats.accesscache_misses++; 363 error = nfs3_access_otw(vp, wmode, ap->a_td,ap->a_cred); 364 if (!error) { 365 if ((np->n_mode & mode) != mode) { 366 error = EACCES; 367 } 368 } 369 } 370 return (error); 371 } else { 372 if ((error = nfsspec_access(ap)) != 0) 373 return (error); 374 375 /* 376 * Attempt to prevent a mapped root from accessing a file 377 * which it shouldn't. We try to read a byte from the file 378 * if the user is root and the file is not zero length. 379 * After calling nfsspec_access, we should have the correct 380 * file size cached. 381 */ 382 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD) 383 && VTONFS(vp)->n_size > 0) { 384 struct iovec aiov; 385 struct uio auio; 386 char buf[1]; 387 388 aiov.iov_base = buf; 389 aiov.iov_len = 1; 390 auio.uio_iov = &aiov; 391 auio.uio_iovcnt = 1; 392 auio.uio_offset = 0; 393 auio.uio_resid = 1; 394 auio.uio_segflg = UIO_SYSSPACE; 395 auio.uio_rw = UIO_READ; 396 auio.uio_td = ap->a_td; 397 398 if (vp->v_type == VREG) 399 error = nfs_readrpc(vp, &auio, ap->a_cred); 400 else if (vp->v_type == VDIR) { 401 char* bp; 402 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 403 aiov.iov_base = bp; 404 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 405 error = nfs_readdirrpc(vp, &auio, ap->a_cred); 406 free(bp, M_TEMP); 407 } else if (vp->v_type == VLNK) 408 error = nfs_readlinkrpc(vp, &auio, ap->a_cred); 409 else 410 error = EACCES; 411 } 412 return (error); 413 } 414 } 415 416 /* 417 * nfs open vnode op 418 * Check to see if the type is ok 419 * and that deletion is not in progress. 420 * For paged in text files, you will need to flush the page cache 421 * if consistency is lost. 422 */ 423 /* ARGSUSED */ 424 static int 425 nfs_open(struct vop_open_args *ap) 426 { 427 struct vnode *vp = ap->a_vp; 428 struct nfsnode *np = VTONFS(vp); 429 struct vattr vattr; 430 int error; 431 432 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 433 #ifdef DIAGNOSTIC 434 printf("open eacces vtyp=%d\n", vp->v_type); 435 #endif 436 return (EOPNOTSUPP); 437 } 438 /* 439 * Get a valid lease. If cached data is stale, flush it. 440 */ 441 if (np->n_flag & NMODIFIED) { 442 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_td, 1); 443 if (error == EINTR || error == EIO) 444 return (error); 445 np->n_attrstamp = 0; 446 if (vp->v_type == VDIR) 447 np->n_direofoffset = 0; 448 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td); 449 if (error) 450 return (error); 451 np->n_mtime = vattr.va_mtime.tv_sec; 452 } else { 453 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td); 454 if (error) 455 return (error); 456 if (np->n_mtime != vattr.va_mtime.tv_sec) { 457 if (vp->v_type == VDIR) 458 np->n_direofoffset = 0; 459 error = nfs_vinvalbuf(vp, V_SAVE, 460 ap->a_cred, ap->a_td, 1); 461 if (error == EINTR || error == EIO) 462 return (error); 463 np->n_mtime = vattr.va_mtime.tv_sec; 464 } 465 } 466 np->n_attrstamp = 0; /* For Open/Close consistency */ 467 return (0); 468 } 469 470 /* 471 * nfs close vnode op 472 * What an NFS client should do upon close after writing is a debatable issue. 473 * Most NFS clients push delayed writes to the server upon close, basically for 474 * two reasons: 475 * 1 - So that any write errors may be reported back to the client process 476 * doing the close system call. By far the two most likely errors are 477 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 478 * 2 - To put a worst case upper bound on cache inconsistency between 479 * multiple clients for the file. 480 * There is also a consistency problem for Version 2 of the protocol w.r.t. 481 * not being able to tell if other clients are writing a file concurrently, 482 * since there is no way of knowing if the changed modify time in the reply 483 * is only due to the write for this client. 484 * (NFS Version 3 provides weak cache consistency data in the reply that 485 * should be sufficient to detect and handle this case.) 486 * 487 * The current code does the following: 488 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 489 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 490 * or commit them (this satisfies 1 and 2 except for the 491 * case where the server crashes after this close but 492 * before the commit RPC, which is felt to be "good 493 * enough". Changing the last argument to nfs_flush() to 494 * a 1 would force a commit operation, if it is felt a 495 * commit is necessary now. 496 */ 497 /* ARGSUSED */ 498 static int 499 nfs_close(struct vop_close_args *ap) 500 { 501 struct vnode *vp = ap->a_vp; 502 struct nfsnode *np = VTONFS(vp); 503 int error = 0; 504 505 if (vp->v_type == VREG) { 506 if (np->n_flag & NMODIFIED) { 507 if (NFS_ISV3(vp)) { 508 /* 509 * Under NFSv3 we have dirty buffers to dispose of. We 510 * must flush them to the NFS server. We have the option 511 * of waiting all the way through the commit rpc or just 512 * waiting for the initial write. The default is to only 513 * wait through the initial write so the data is in the 514 * server's cache, which is roughly similar to the state 515 * a standard disk subsystem leaves the file in on close(). 516 * 517 * We cannot clear the NMODIFIED bit in np->n_flag due to 518 * potential races with other processes, and certainly 519 * cannot clear it if we don't commit. 520 */ 521 int cm = nfsv3_commit_on_close ? 1 : 0; 522 error = nfs_flush(vp, ap->a_cred, MNT_WAIT, ap->a_td, cm); 523 /* np->n_flag &= ~NMODIFIED; */ 524 } else { 525 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_td); 526 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_td, 1); 527 VOP_UNLOCK(vp, 0, ap->a_td); 528 } 529 np->n_attrstamp = 0; 530 } 531 if (np->n_flag & NWRITEERR) { 532 np->n_flag &= ~NWRITEERR; 533 error = np->n_error; 534 } 535 } 536 return (error); 537 } 538 539 /* 540 * nfs getattr call from vfs. 541 */ 542 static int 543 nfs_getattr(struct vop_getattr_args *ap) 544 { 545 struct vnode *vp = ap->a_vp; 546 struct nfsnode *np = VTONFS(vp); 547 caddr_t bpos, dpos; 548 int error = 0; 549 struct mbuf *mreq, *mrep, *md, *mb; 550 int v3 = NFS_ISV3(vp); 551 552 /* 553 * Update local times for special files. 554 */ 555 if (np->n_flag & (NACC | NUPD)) 556 np->n_flag |= NCHG; 557 /* 558 * First look in the cache. 559 */ 560 if (nfs_getattrcache(vp, ap->a_vap) == 0) 561 return (0); 562 563 if (v3 && nfsaccess_cache_timeout > 0) { 564 nfsstats.accesscache_misses++; 565 nfs3_access_otw(vp, NFSV3ACCESS_ALL, ap->a_td, ap->a_cred); 566 if (nfs_getattrcache(vp, ap->a_vap) == 0) 567 return (0); 568 } 569 570 nfsstats.rpccnt[NFSPROC_GETATTR]++; 571 mreq = nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); 572 mb = mreq; 573 bpos = mtod(mb, caddr_t); 574 nfsm_fhtom(vp, v3); 575 nfsm_request(vp, NFSPROC_GETATTR, ap->a_td, ap->a_cred); 576 if (!error) { 577 nfsm_loadattr(vp, ap->a_vap); 578 } 579 m_freem(mrep); 580 nfsmout: 581 return (error); 582 } 583 584 /* 585 * nfs setattr call. 586 */ 587 static int 588 nfs_setattr(struct vop_setattr_args *ap) 589 { 590 struct vnode *vp = ap->a_vp; 591 struct nfsnode *np = VTONFS(vp); 592 struct vattr *vap = ap->a_vap; 593 int error = 0; 594 u_quad_t tsize; 595 596 #ifndef nolint 597 tsize = (u_quad_t)0; 598 #endif 599 600 /* 601 * Setting of flags is not supported. 602 */ 603 if (vap->va_flags != VNOVAL) 604 return (EOPNOTSUPP); 605 606 /* 607 * Disallow write attempts if the filesystem is mounted read-only. 608 */ 609 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 610 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 611 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 612 (vp->v_mount->mnt_flag & MNT_RDONLY)) 613 return (EROFS); 614 if (vap->va_size != VNOVAL) { 615 switch (vp->v_type) { 616 case VDIR: 617 return (EISDIR); 618 case VCHR: 619 case VBLK: 620 case VSOCK: 621 case VFIFO: 622 if (vap->va_mtime.tv_sec == VNOVAL && 623 vap->va_atime.tv_sec == VNOVAL && 624 vap->va_mode == (mode_t)VNOVAL && 625 vap->va_uid == (uid_t)VNOVAL && 626 vap->va_gid == (gid_t)VNOVAL) 627 return (0); 628 vap->va_size = VNOVAL; 629 break; 630 default: 631 /* 632 * Disallow write attempts if the filesystem is 633 * mounted read-only. 634 */ 635 if (vp->v_mount->mnt_flag & MNT_RDONLY) 636 return (EROFS); 637 638 /* 639 * We run vnode_pager_setsize() early (why?), 640 * we must set np->n_size now to avoid vinvalbuf 641 * V_SAVE races that might setsize a lower 642 * value. 643 */ 644 645 tsize = np->n_size; 646 error = nfs_meta_setsize(vp, ap->a_cred, 647 ap->a_td, vap->va_size); 648 649 if (np->n_flag & NMODIFIED) { 650 if (vap->va_size == 0) 651 error = nfs_vinvalbuf(vp, 0, 652 ap->a_cred, ap->a_td, 1); 653 else 654 error = nfs_vinvalbuf(vp, V_SAVE, 655 ap->a_cred, ap->a_td, 1); 656 if (error) { 657 vnode_pager_setsize(vp, np->n_size); 658 return (error); 659 } 660 } 661 /* 662 * np->n_size has already been set to vap->va_size 663 * in nfs_meta_setsize(). We must set it again since 664 * nfs_loadattrcache() could be called through 665 * nfs_meta_setsize() and could modify np->n_size. 666 */ 667 np->n_vattr.va_size = np->n_size = vap->va_size; 668 }; 669 } else if ((vap->va_mtime.tv_sec != VNOVAL || 670 vap->va_atime.tv_sec != VNOVAL) && (np->n_flag & NMODIFIED) && 671 vp->v_type == VREG && 672 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, 673 ap->a_td, 1)) != 0 && (error == EINTR || error == EIO)) 674 return (error); 675 error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_td); 676 if (error && vap->va_size != VNOVAL) { 677 np->n_size = np->n_vattr.va_size = tsize; 678 vnode_pager_setsize(vp, np->n_size); 679 } 680 return (error); 681 } 682 683 /* 684 * Do an nfs setattr rpc. 685 */ 686 static int 687 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 688 struct thread *td) 689 { 690 struct nfsv2_sattr *sp; 691 struct nfsnode *np = VTONFS(vp); 692 caddr_t bpos, dpos; 693 u_int32_t *tl; 694 int error = 0, wccflag = NFSV3_WCCRATTR; 695 struct mbuf *mreq, *mrep, *md, *mb; 696 int v3 = NFS_ISV3(vp); 697 698 nfsstats.rpccnt[NFSPROC_SETATTR]++; 699 mreq = nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 700 mb = mreq; 701 bpos = mtod(mb, caddr_t); 702 nfsm_fhtom(vp, v3); 703 if (v3) { 704 nfsm_v3attrbuild(vap, TRUE); 705 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 706 *tl = nfs_false; 707 } else { 708 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 709 if (vap->va_mode == (mode_t)VNOVAL) 710 sp->sa_mode = nfs_xdrneg1; 711 else 712 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 713 if (vap->va_uid == (uid_t)VNOVAL) 714 sp->sa_uid = nfs_xdrneg1; 715 else 716 sp->sa_uid = txdr_unsigned(vap->va_uid); 717 if (vap->va_gid == (gid_t)VNOVAL) 718 sp->sa_gid = nfs_xdrneg1; 719 else 720 sp->sa_gid = txdr_unsigned(vap->va_gid); 721 sp->sa_size = txdr_unsigned(vap->va_size); 722 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 723 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 724 } 725 nfsm_request(vp, NFSPROC_SETATTR, td, cred); 726 if (v3) { 727 np->n_modestamp = 0; 728 nfsm_wcc_data(vp, wccflag); 729 } else 730 nfsm_loadattr(vp, NULL); 731 m_freem(mrep); 732 nfsmout: 733 return (error); 734 } 735 736 /* 737 * nfs lookup call, one step at a time... 738 * First look in cache 739 * If not found, unlock the directory nfsnode and do the rpc 740 */ 741 static int 742 nfs_lookup(struct vop_lookup_args *ap) 743 { 744 struct componentname *cnp = ap->a_cnp; 745 struct vnode *dvp = ap->a_dvp; 746 struct vnode **vpp = ap->a_vpp; 747 int flags = cnp->cn_flags; 748 struct vnode *newvp; 749 struct nfsmount *nmp; 750 caddr_t bpos, dpos; 751 struct mbuf *mreq, *mrep, *md, *mb; 752 long len; 753 nfsfh_t *fhp; 754 struct nfsnode *np; 755 int lockparent, wantparent, error = 0, attrflag, fhsize; 756 int v3 = NFS_ISV3(dvp); 757 struct thread *td = cnp->cn_thread; 758 759 *vpp = NULLVP; 760 cnp->cn_flags &= ~PDIRUNLOCK; 761 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 762 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 763 return (EROFS); 764 if (dvp->v_type != VDIR) 765 return (ENOTDIR); 766 lockparent = flags & LOCKPARENT; 767 wantparent = flags & (LOCKPARENT|WANTPARENT); 768 nmp = VFSTONFS(dvp->v_mount); 769 np = VTONFS(dvp); 770 if ((error = cache_lookup(dvp, vpp, cnp)) && error != ENOENT) { 771 struct vattr vattr; 772 int vpid; 773 774 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) { 775 *vpp = NULLVP; 776 return (error); 777 } 778 779 vhold(*vpp); 780 newvp = *vpp; 781 vpid = newvp->v_id; 782 /* 783 * See the comment starting `Step through' in ufs/ufs_lookup.c 784 * for an explanation of the locking protocol 785 */ 786 if (dvp == newvp) { 787 VREF(newvp); 788 error = 0; 789 } else if (flags & ISDOTDOT) { 790 VOP_UNLOCK(dvp, 0, td); 791 cnp->cn_flags |= PDIRUNLOCK; 792 error = vget(newvp, LK_EXCLUSIVE, td); 793 if (!error && lockparent && (flags & ISLASTCN)) { 794 error = vn_lock(dvp, LK_EXCLUSIVE, td); 795 if (error == 0) 796 cnp->cn_flags &= ~PDIRUNLOCK; 797 } 798 } else { 799 error = vget(newvp, LK_EXCLUSIVE, td); 800 if (!lockparent || error || !(flags & ISLASTCN)) { 801 VOP_UNLOCK(dvp, 0, td); 802 cnp->cn_flags |= PDIRUNLOCK; 803 } 804 } 805 if (!error) { 806 if (vpid == newvp->v_id) { 807 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, td) 808 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 809 nfsstats.lookupcache_hits++; 810 if (cnp->cn_nameiop != LOOKUP && 811 (flags & ISLASTCN)) 812 cnp->cn_flags |= SAVENAME; 813 vdrop(newvp); 814 return (0); 815 } 816 cache_purge(newvp); 817 } 818 vput(newvp); 819 if (lockparent && dvp != newvp && (flags & ISLASTCN)) 820 VOP_UNLOCK(dvp, 0, td); 821 } 822 vdrop(newvp); 823 error = vn_lock(dvp, LK_EXCLUSIVE, td); 824 *vpp = NULLVP; 825 if (error) { 826 cnp->cn_flags |= PDIRUNLOCK; 827 return (error); 828 } 829 cnp->cn_flags &= ~PDIRUNLOCK; 830 } 831 error = 0; 832 newvp = NULLVP; 833 nfsstats.lookupcache_misses++; 834 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 835 len = cnp->cn_namelen; 836 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 837 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 838 mb = mreq; 839 bpos = mtod(mb, caddr_t); 840 nfsm_fhtom(dvp, v3); 841 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 842 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred); 843 if (error) { 844 nfsm_postop_attr(dvp, attrflag); 845 m_freem(mrep); 846 goto nfsmout; 847 } 848 nfsm_getfh(fhp, fhsize, v3); 849 850 /* 851 * Handle RENAME case... 852 */ 853 if (cnp->cn_nameiop == RENAME && wantparent && (flags & ISLASTCN)) { 854 if (NFS_CMPFH(np, fhp, fhsize)) { 855 m_freem(mrep); 856 return (EISDIR); 857 } 858 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 859 if (error) { 860 m_freem(mrep); 861 return (error); 862 } 863 newvp = NFSTOV(np); 864 if (v3) { 865 nfsm_postop_attr(newvp, attrflag); 866 nfsm_postop_attr(dvp, attrflag); 867 } else 868 nfsm_loadattr(newvp, NULL); 869 *vpp = newvp; 870 m_freem(mrep); 871 cnp->cn_flags |= SAVENAME; 872 if (!lockparent) { 873 VOP_UNLOCK(dvp, 0, td); 874 cnp->cn_flags |= PDIRUNLOCK; 875 } 876 return (0); 877 } 878 879 if (flags & ISDOTDOT) { 880 VOP_UNLOCK(dvp, 0, td); 881 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 882 if (error) { 883 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 884 return (error); 885 } 886 newvp = NFSTOV(np); 887 if (lockparent && (flags & ISLASTCN)) { 888 error = vn_lock(dvp, LK_EXCLUSIVE, td); 889 if (error) { 890 cnp->cn_flags |= PDIRUNLOCK; 891 vput(newvp); 892 return (error); 893 } 894 } else 895 cnp->cn_flags |= PDIRUNLOCK; 896 } else if (NFS_CMPFH(np, fhp, fhsize)) { 897 VREF(dvp); 898 newvp = dvp; 899 } else { 900 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 901 if (error) { 902 m_freem(mrep); 903 return (error); 904 } 905 if (!lockparent || !(flags & ISLASTCN)) { 906 cnp->cn_flags |= PDIRUNLOCK; 907 VOP_UNLOCK(dvp, 0, td); 908 } 909 newvp = NFSTOV(np); 910 } 911 if (v3) { 912 nfsm_postop_attr(newvp, attrflag); 913 nfsm_postop_attr(dvp, attrflag); 914 } else 915 nfsm_loadattr(newvp, NULL); 916 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 917 cnp->cn_flags |= SAVENAME; 918 if ((cnp->cn_flags & MAKEENTRY) && 919 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) { 920 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 921 cache_enter(dvp, newvp, cnp); 922 } 923 *vpp = newvp; 924 m_freem(mrep); 925 nfsmout: 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, td); 935 cnp->cn_flags |= PDIRUNLOCK; 936 } 937 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 938 error = EROFS; 939 else 940 error = EJUSTRETURN; 941 } 942 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 943 cnp->cn_flags |= SAVENAME; 944 } 945 return (error); 946 } 947 948 /* 949 * nfs read call. 950 * Just call nfs_bioread() to do the work. 951 */ 952 static int 953 nfs_read(struct vop_read_args *ap) 954 { 955 struct vnode *vp = ap->a_vp; 956 957 switch (vp->v_type) { 958 case VREG: 959 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 960 case VDIR: 961 return (EISDIR); 962 default: 963 return (EOPNOTSUPP); 964 } 965 } 966 967 /* 968 * nfs readlink call 969 */ 970 static int 971 nfs_readlink(struct vop_readlink_args *ap) 972 { 973 struct vnode *vp = ap->a_vp; 974 975 if (vp->v_type != VLNK) 976 return (EINVAL); 977 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred)); 978 } 979 980 /* 981 * Do a readlink rpc. 982 * Called by nfs_doio() from below the buffer cache. 983 */ 984 int 985 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 986 { 987 caddr_t bpos, dpos; 988 int error = 0, len, attrflag; 989 struct mbuf *mreq, *mrep, *md, *mb; 990 int v3 = NFS_ISV3(vp); 991 992 nfsstats.rpccnt[NFSPROC_READLINK]++; 993 mreq = nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 994 mb = mreq; 995 bpos = mtod(mb, caddr_t); 996 nfsm_fhtom(vp, v3); 997 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred); 998 if (v3) 999 nfsm_postop_attr(vp, attrflag); 1000 if (!error) { 1001 nfsm_strsiz(len, NFS_MAXPATHLEN); 1002 if (len == NFS_MAXPATHLEN) { 1003 struct nfsnode *np = VTONFS(vp); 1004 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1005 len = np->n_size; 1006 } 1007 nfsm_mtouio(uiop, len); 1008 } 1009 m_freem(mrep); 1010 nfsmout: 1011 return (error); 1012 } 1013 1014 /* 1015 * nfs read rpc call 1016 * Ditto above 1017 */ 1018 int 1019 nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1020 { 1021 u_int32_t *tl; 1022 caddr_t bpos, dpos; 1023 struct mbuf *mreq, *mrep, *md, *mb; 1024 struct nfsmount *nmp; 1025 int error = 0, len, retlen, tsiz, eof, attrflag; 1026 int v3 = NFS_ISV3(vp); 1027 1028 #ifndef nolint 1029 eof = 0; 1030 #endif 1031 nmp = VFSTONFS(vp->v_mount); 1032 tsiz = uiop->uio_resid; 1033 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1034 return (EFBIG); 1035 while (tsiz > 0) { 1036 nfsstats.rpccnt[NFSPROC_READ]++; 1037 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1038 mreq = nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1039 mb = mreq; 1040 bpos = mtod(mb, caddr_t); 1041 nfsm_fhtom(vp, v3); 1042 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3); 1043 if (v3) { 1044 txdr_hyper(uiop->uio_offset, tl); 1045 *(tl + 2) = txdr_unsigned(len); 1046 } else { 1047 *tl++ = txdr_unsigned(uiop->uio_offset); 1048 *tl++ = txdr_unsigned(len); 1049 *tl = 0; 1050 } 1051 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred); 1052 if (v3) { 1053 nfsm_postop_attr(vp, attrflag); 1054 if (error) { 1055 m_freem(mrep); 1056 goto nfsmout; 1057 } 1058 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED); 1059 eof = fxdr_unsigned(int, *(tl + 1)); 1060 } else 1061 nfsm_loadattr(vp, NULL); 1062 nfsm_strsiz(retlen, nmp->nm_rsize); 1063 nfsm_mtouio(uiop, retlen); 1064 m_freem(mrep); 1065 tsiz -= retlen; 1066 if (v3) { 1067 if (eof || retlen == 0) { 1068 tsiz = 0; 1069 } 1070 } else if (retlen < len) { 1071 tsiz = 0; 1072 } 1073 } 1074 nfsmout: 1075 return (error); 1076 } 1077 1078 /* 1079 * nfs write call 1080 */ 1081 int 1082 nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1083 int *iomode, int *must_commit) 1084 { 1085 u_int32_t *tl; 1086 int32_t backup; 1087 caddr_t bpos, dpos; 1088 struct mbuf *mreq, *mrep, *md, *mb; 1089 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1090 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1091 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1092 1093 #ifndef DIAGNOSTIC 1094 if (uiop->uio_iovcnt != 1) 1095 panic("nfs: writerpc iovcnt > 1"); 1096 #endif 1097 *must_commit = 0; 1098 tsiz = uiop->uio_resid; 1099 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1100 return (EFBIG); 1101 while (tsiz > 0) { 1102 nfsstats.rpccnt[NFSPROC_WRITE]++; 1103 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 1104 mreq = nfsm_reqhead(vp, NFSPROC_WRITE, 1105 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1106 mb = mreq; 1107 bpos = mtod(mb, caddr_t); 1108 nfsm_fhtom(vp, v3); 1109 if (v3) { 1110 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 1111 txdr_hyper(uiop->uio_offset, tl); 1112 tl += 2; 1113 *tl++ = txdr_unsigned(len); 1114 *tl++ = txdr_unsigned(*iomode); 1115 *tl = txdr_unsigned(len); 1116 } else { 1117 u_int32_t x; 1118 1119 tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED); 1120 /* Set both "begin" and "current" to non-garbage. */ 1121 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1122 *tl++ = x; /* "begin offset" */ 1123 *tl++ = x; /* "current offset" */ 1124 x = txdr_unsigned(len); 1125 *tl++ = x; /* total to this offset */ 1126 *tl = x; /* size of this write */ 1127 } 1128 nfsm_uiotom(uiop, len); 1129 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred); 1130 if (v3) { 1131 wccflag = NFSV3_WCCCHK; 1132 nfsm_wcc_data(vp, wccflag); 1133 if (!error) { 1134 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED 1135 + NFSX_V3WRITEVERF); 1136 rlen = fxdr_unsigned(int, *tl++); 1137 if (rlen == 0) { 1138 error = NFSERR_IO; 1139 m_freem(mrep); 1140 break; 1141 } else if (rlen < len) { 1142 backup = len - rlen; 1143 uiop->uio_iov->iov_base = 1144 (char *)uiop->uio_iov->iov_base - 1145 backup; 1146 uiop->uio_iov->iov_len += backup; 1147 uiop->uio_offset -= backup; 1148 uiop->uio_resid += backup; 1149 len = rlen; 1150 } 1151 commit = fxdr_unsigned(int, *tl++); 1152 1153 /* 1154 * Return the lowest committment level 1155 * obtained by any of the RPCs. 1156 */ 1157 if (committed == NFSV3WRITE_FILESYNC) 1158 committed = commit; 1159 else if (committed == NFSV3WRITE_DATASYNC && 1160 commit == NFSV3WRITE_UNSTABLE) 1161 committed = commit; 1162 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1163 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1164 NFSX_V3WRITEVERF); 1165 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1166 } else if (bcmp((caddr_t)tl, 1167 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1168 *must_commit = 1; 1169 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1170 NFSX_V3WRITEVERF); 1171 } 1172 } 1173 } else 1174 nfsm_loadattr(vp, NULL); 1175 if (wccflag) 1176 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime.tv_sec; 1177 m_freem(mrep); 1178 if (error) 1179 break; 1180 tsiz -= len; 1181 } 1182 nfsmout: 1183 if (vp->v_mount->mnt_flag & MNT_ASYNC) 1184 committed = NFSV3WRITE_FILESYNC; 1185 *iomode = committed; 1186 if (error) 1187 uiop->uio_resid = tsiz; 1188 return (error); 1189 } 1190 1191 /* 1192 * nfs mknod rpc 1193 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1194 * mode set to specify the file type and the size field for rdev. 1195 */ 1196 static int 1197 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1198 struct vattr *vap) 1199 { 1200 struct nfsv2_sattr *sp; 1201 u_int32_t *tl; 1202 struct vnode *newvp = NULL; 1203 struct nfsnode *np = NULL; 1204 struct vattr vattr; 1205 caddr_t bpos, dpos; 1206 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1207 struct mbuf *mreq, *mrep, *md, *mb; 1208 u_int32_t rdev; 1209 int v3 = NFS_ISV3(dvp); 1210 1211 if (vap->va_type == VCHR || vap->va_type == VBLK) 1212 rdev = txdr_unsigned(vap->va_rdev); 1213 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1214 rdev = nfs_xdrneg1; 1215 else { 1216 return (EOPNOTSUPP); 1217 } 1218 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1219 return (error); 1220 } 1221 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1222 mreq = nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1223 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1224 mb = mreq; 1225 bpos = mtod(mb, caddr_t); 1226 nfsm_fhtom(dvp, v3); 1227 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1228 if (v3) { 1229 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1230 *tl++ = vtonfsv3_type(vap->va_type); 1231 nfsm_v3attrbuild(vap, FALSE); 1232 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1233 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 1234 *tl++ = txdr_unsigned(umajor(vap->va_rdev)); 1235 *tl = txdr_unsigned(uminor(vap->va_rdev)); 1236 } 1237 } else { 1238 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1239 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1240 sp->sa_uid = nfs_xdrneg1; 1241 sp->sa_gid = nfs_xdrneg1; 1242 sp->sa_size = rdev; 1243 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1244 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1245 } 1246 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred); 1247 if (!error) { 1248 nfsm_mtofh(dvp, newvp, v3, gotvp); 1249 if (!gotvp) { 1250 if (newvp) { 1251 vput(newvp); 1252 newvp = NULL; 1253 } 1254 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1255 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1256 if (!error) 1257 newvp = NFSTOV(np); 1258 } 1259 } 1260 if (v3) 1261 nfsm_wcc_data(dvp, wccflag); 1262 m_freem(mrep); 1263 nfsmout: 1264 if (error) { 1265 if (newvp) 1266 vput(newvp); 1267 } else { 1268 if (cnp->cn_flags & MAKEENTRY) 1269 cache_enter(dvp, newvp, cnp); 1270 *vpp = newvp; 1271 } 1272 VTONFS(dvp)->n_flag |= NMODIFIED; 1273 if (!wccflag) 1274 VTONFS(dvp)->n_attrstamp = 0; 1275 return (error); 1276 } 1277 1278 /* 1279 * nfs mknod vop 1280 * just call nfs_mknodrpc() to do the work. 1281 */ 1282 /* ARGSUSED */ 1283 static int 1284 nfs_mknod(struct vop_mknod_args *ap) 1285 { 1286 1287 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1288 } 1289 1290 static u_long create_verf; 1291 /* 1292 * nfs file create call 1293 */ 1294 static int 1295 nfs_create(struct vop_create_args *ap) 1296 { 1297 struct vnode *dvp = ap->a_dvp; 1298 struct vattr *vap = ap->a_vap; 1299 struct componentname *cnp = ap->a_cnp; 1300 struct nfsv2_sattr *sp; 1301 u_int32_t *tl; 1302 struct nfsnode *np = NULL; 1303 struct vnode *newvp = NULL; 1304 caddr_t bpos, dpos; 1305 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1306 struct mbuf *mreq, *mrep, *md, *mb; 1307 struct vattr vattr; 1308 int v3 = NFS_ISV3(dvp); 1309 1310 /* 1311 * Oops, not for me.. 1312 */ 1313 if (vap->va_type == VSOCK) 1314 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1315 1316 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1317 return (error); 1318 } 1319 if (vap->va_vaflags & VA_EXCLUSIVE) 1320 fmode |= O_EXCL; 1321 again: 1322 nfsstats.rpccnt[NFSPROC_CREATE]++; 1323 mreq = nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1324 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1325 mb = mreq; 1326 bpos = mtod(mb, caddr_t); 1327 nfsm_fhtom(dvp, v3); 1328 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1329 if (v3) { 1330 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1331 if (fmode & O_EXCL) { 1332 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1333 tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF); 1334 #ifdef INET 1335 if (!TAILQ_EMPTY(&in_ifaddrhead)) 1336 *tl++ = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr.s_addr; 1337 else 1338 #endif 1339 *tl++ = create_verf; 1340 *tl = ++create_verf; 1341 } else { 1342 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1343 nfsm_v3attrbuild(vap, FALSE); 1344 } 1345 } else { 1346 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1347 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1348 sp->sa_uid = nfs_xdrneg1; 1349 sp->sa_gid = nfs_xdrneg1; 1350 sp->sa_size = 0; 1351 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1352 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1353 } 1354 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred); 1355 if (!error) { 1356 nfsm_mtofh(dvp, newvp, v3, gotvp); 1357 if (!gotvp) { 1358 if (newvp) { 1359 vput(newvp); 1360 newvp = NULL; 1361 } 1362 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1363 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1364 if (!error) 1365 newvp = NFSTOV(np); 1366 } 1367 } 1368 if (v3) 1369 nfsm_wcc_data(dvp, wccflag); 1370 m_freem(mrep); 1371 nfsmout: 1372 if (error) { 1373 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1374 fmode &= ~O_EXCL; 1375 goto again; 1376 } 1377 if (newvp) 1378 vput(newvp); 1379 } else if (v3 && (fmode & O_EXCL)) { 1380 /* 1381 * We are normally called with only a partially initialized 1382 * VAP. Since the NFSv3 spec says that server may use the 1383 * file attributes to store the verifier, the spec requires 1384 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1385 * in atime, but we can't really assume that all servers will 1386 * so we ensure that our SETATTR sets both atime and mtime. 1387 */ 1388 if (vap->va_mtime.tv_sec == VNOVAL) 1389 vfs_timestamp(&vap->va_mtime); 1390 if (vap->va_atime.tv_sec == VNOVAL) 1391 vap->va_atime = vap->va_mtime; 1392 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_thread); 1393 } 1394 if (!error) { 1395 if (cnp->cn_flags & MAKEENTRY) 1396 cache_enter(dvp, newvp, cnp); 1397 *ap->a_vpp = newvp; 1398 } 1399 VTONFS(dvp)->n_flag |= NMODIFIED; 1400 if (!wccflag) 1401 VTONFS(dvp)->n_attrstamp = 0; 1402 return (error); 1403 } 1404 1405 /* 1406 * nfs file remove call 1407 * To try and make nfs semantics closer to ufs semantics, a file that has 1408 * other processes using the vnode is renamed instead of removed and then 1409 * removed later on the last close. 1410 * - If v_usecount > 1 1411 * If a rename is not already in the works 1412 * call nfs_sillyrename() to set it up 1413 * else 1414 * do the remove rpc 1415 */ 1416 static int 1417 nfs_remove(struct vop_remove_args *ap) 1418 { 1419 struct vnode *vp = ap->a_vp; 1420 struct vnode *dvp = ap->a_dvp; 1421 struct componentname *cnp = ap->a_cnp; 1422 struct nfsnode *np = VTONFS(vp); 1423 int error = 0; 1424 struct vattr vattr; 1425 1426 #ifndef DIAGNOSTIC 1427 if ((cnp->cn_flags & HASBUF) == 0) 1428 panic("nfs_remove: no name"); 1429 if (vrefcnt(vp) < 1) 1430 panic("nfs_remove: bad v_usecount"); 1431 #endif 1432 if (vp->v_type == VDIR) 1433 error = EPERM; 1434 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1435 VOP_GETATTR(vp, &vattr, cnp->cn_cred, cnp->cn_thread) == 0 && 1436 vattr.va_nlink > 1)) { 1437 /* 1438 * Purge the name cache so that the chance of a lookup for 1439 * the name succeeding while the remove is in progress is 1440 * minimized. Without node locking it can still happen, such 1441 * that an I/O op returns ESTALE, but since you get this if 1442 * another host removes the file.. 1443 */ 1444 cache_purge(vp); 1445 /* 1446 * throw away biocache buffers, mainly to avoid 1447 * unnecessary delayed writes later. 1448 */ 1449 error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, cnp->cn_thread, 1); 1450 /* Do the rpc */ 1451 if (error != EINTR && error != EIO) 1452 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1453 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1454 /* 1455 * Kludge City: If the first reply to the remove rpc is lost.. 1456 * the reply to the retransmitted request will be ENOENT 1457 * since the file was in fact removed 1458 * Therefore, we cheat and return success. 1459 */ 1460 if (error == ENOENT) 1461 error = 0; 1462 } else if (!np->n_sillyrename) 1463 error = nfs_sillyrename(dvp, vp, cnp); 1464 np->n_attrstamp = 0; 1465 return (error); 1466 } 1467 1468 /* 1469 * nfs file remove rpc called from nfs_inactive 1470 */ 1471 int 1472 nfs_removeit(struct sillyrename *sp) 1473 { 1474 1475 /* 1476 * Make sure that the directory vnode is still valid. 1477 * XXX we should lock sp->s_dvp here. 1478 */ 1479 if (sp->s_dvp->v_type == VBAD) 1480 return (0); 1481 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1482 NULL)); 1483 } 1484 1485 /* 1486 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1487 */ 1488 static int 1489 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1490 struct ucred *cred, struct thread *td) 1491 { 1492 caddr_t bpos, dpos; 1493 int error = 0, wccflag = NFSV3_WCCRATTR; 1494 struct mbuf *mreq, *mrep, *md, *mb; 1495 int v3 = NFS_ISV3(dvp); 1496 1497 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1498 mreq = nfsm_reqhead(dvp, NFSPROC_REMOVE, 1499 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1500 mb = mreq; 1501 bpos = mtod(mb, caddr_t); 1502 nfsm_fhtom(dvp, v3); 1503 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1504 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1505 if (v3) 1506 nfsm_wcc_data(dvp, wccflag); 1507 m_freem(mrep); 1508 nfsmout: 1509 VTONFS(dvp)->n_flag |= NMODIFIED; 1510 if (!wccflag) 1511 VTONFS(dvp)->n_attrstamp = 0; 1512 return (error); 1513 } 1514 1515 /* 1516 * nfs file rename call 1517 */ 1518 static int 1519 nfs_rename(struct vop_rename_args *ap) 1520 { 1521 struct vnode *fvp = ap->a_fvp; 1522 struct vnode *tvp = ap->a_tvp; 1523 struct vnode *fdvp = ap->a_fdvp; 1524 struct vnode *tdvp = ap->a_tdvp; 1525 struct componentname *tcnp = ap->a_tcnp; 1526 struct componentname *fcnp = ap->a_fcnp; 1527 int error; 1528 1529 #ifndef DIAGNOSTIC 1530 if ((tcnp->cn_flags & HASBUF) == 0 || 1531 (fcnp->cn_flags & HASBUF) == 0) 1532 panic("nfs_rename: no name"); 1533 #endif 1534 /* Check for cross-device rename */ 1535 if ((fvp->v_mount != tdvp->v_mount) || 1536 (tvp && (fvp->v_mount != tvp->v_mount))) { 1537 error = EXDEV; 1538 goto out; 1539 } 1540 1541 if (fvp == tvp) { 1542 printf("nfs_rename: fvp == tvp (can't happen)\n"); 1543 error = 0; 1544 goto out; 1545 } 1546 if ((error = vn_lock(fvp, LK_EXCLUSIVE, fcnp->cn_thread)) != 0) 1547 goto out; 1548 1549 /* 1550 * We have to flush B_DELWRI data prior to renaming 1551 * the file. If we don't, the delayed-write buffers 1552 * can be flushed out later after the file has gone stale 1553 * under NFSV3. NFSV2 does not have this problem because 1554 * ( as far as I can tell ) it flushes dirty buffers more 1555 * often. 1556 */ 1557 VOP_FSYNC(fvp, fcnp->cn_cred, MNT_WAIT, fcnp->cn_thread); 1558 VOP_UNLOCK(fvp, 0, fcnp->cn_thread); 1559 if (tvp) 1560 VOP_FSYNC(tvp, tcnp->cn_cred, MNT_WAIT, tcnp->cn_thread); 1561 1562 /* 1563 * If the tvp exists and is in use, sillyrename it before doing the 1564 * rename of the new file over it. 1565 * XXX Can't sillyrename a directory. 1566 */ 1567 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1568 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1569 vput(tvp); 1570 tvp = NULL; 1571 } 1572 1573 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1574 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1575 tcnp->cn_thread); 1576 1577 if (fvp->v_type == VDIR) { 1578 if (tvp != NULL && tvp->v_type == VDIR) 1579 cache_purge(tdvp); 1580 cache_purge(fdvp); 1581 } 1582 1583 out: 1584 if (tdvp == tvp) 1585 vrele(tdvp); 1586 else 1587 vput(tdvp); 1588 if (tvp) 1589 vput(tvp); 1590 vrele(fdvp); 1591 vrele(fvp); 1592 /* 1593 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1594 */ 1595 if (error == ENOENT) 1596 error = 0; 1597 return (error); 1598 } 1599 1600 /* 1601 * nfs file rename rpc called from nfs_remove() above 1602 */ 1603 static int 1604 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 1605 struct sillyrename *sp) 1606 { 1607 1608 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp, 1609 sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread)); 1610 } 1611 1612 /* 1613 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1614 */ 1615 static int 1616 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 1617 struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred, 1618 struct thread *td) 1619 { 1620 caddr_t bpos, dpos; 1621 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1622 struct mbuf *mreq, *mrep, *md, *mb; 1623 int v3 = NFS_ISV3(fdvp); 1624 1625 nfsstats.rpccnt[NFSPROC_RENAME]++; 1626 mreq = nfsm_reqhead(fdvp, NFSPROC_RENAME, 1627 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1628 nfsm_rndup(tnamelen)); 1629 mb = mreq; 1630 bpos = mtod(mb, caddr_t); 1631 nfsm_fhtom(fdvp, v3); 1632 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1633 nfsm_fhtom(tdvp, v3); 1634 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1635 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1636 if (v3) { 1637 nfsm_wcc_data(fdvp, fwccflag); 1638 nfsm_wcc_data(tdvp, twccflag); 1639 } 1640 m_freem(mrep); 1641 nfsmout: 1642 VTONFS(fdvp)->n_flag |= NMODIFIED; 1643 VTONFS(tdvp)->n_flag |= NMODIFIED; 1644 if (!fwccflag) 1645 VTONFS(fdvp)->n_attrstamp = 0; 1646 if (!twccflag) 1647 VTONFS(tdvp)->n_attrstamp = 0; 1648 return (error); 1649 } 1650 1651 /* 1652 * nfs hard link create call 1653 */ 1654 static int 1655 nfs_link(struct vop_link_args *ap) 1656 { 1657 struct vnode *vp = ap->a_vp; 1658 struct vnode *tdvp = ap->a_tdvp; 1659 struct componentname *cnp = ap->a_cnp; 1660 caddr_t bpos, dpos; 1661 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1662 struct mbuf *mreq, *mrep, *md, *mb; 1663 int v3; 1664 1665 if (vp->v_mount != tdvp->v_mount) { 1666 return (EXDEV); 1667 } 1668 1669 /* 1670 * Push all writes to the server, so that the attribute cache 1671 * doesn't get "out of sync" with the server. 1672 * XXX There should be a better way! 1673 */ 1674 VOP_FSYNC(vp, cnp->cn_cred, MNT_WAIT, cnp->cn_thread); 1675 1676 v3 = NFS_ISV3(vp); 1677 nfsstats.rpccnt[NFSPROC_LINK]++; 1678 mreq = nfsm_reqhead(vp, NFSPROC_LINK, 1679 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1680 mb = mreq; 1681 bpos = mtod(mb, caddr_t); 1682 nfsm_fhtom(vp, v3); 1683 nfsm_fhtom(tdvp, v3); 1684 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1685 nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred); 1686 if (v3) { 1687 nfsm_postop_attr(vp, attrflag); 1688 nfsm_wcc_data(tdvp, wccflag); 1689 } 1690 m_freem(mrep); 1691 nfsmout: 1692 VTONFS(tdvp)->n_flag |= NMODIFIED; 1693 if (!attrflag) 1694 VTONFS(vp)->n_attrstamp = 0; 1695 if (!wccflag) 1696 VTONFS(tdvp)->n_attrstamp = 0; 1697 /* 1698 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 1699 */ 1700 if (error == EEXIST) 1701 error = 0; 1702 return (error); 1703 } 1704 1705 /* 1706 * nfs symbolic link create call 1707 */ 1708 static int 1709 nfs_symlink(struct vop_symlink_args *ap) 1710 { 1711 struct vnode *dvp = ap->a_dvp; 1712 struct vattr *vap = ap->a_vap; 1713 struct componentname *cnp = ap->a_cnp; 1714 struct nfsv2_sattr *sp; 1715 caddr_t bpos, dpos; 1716 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 1717 struct mbuf *mreq, *mrep, *md, *mb; 1718 struct vnode *newvp = NULL; 1719 int v3 = NFS_ISV3(dvp); 1720 1721 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 1722 slen = strlen(ap->a_target); 1723 mreq = nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 1724 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 1725 mb = mreq; 1726 bpos = mtod(mb, caddr_t); 1727 nfsm_fhtom(dvp, v3); 1728 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1729 if (v3) { 1730 nfsm_v3attrbuild(vap, FALSE); 1731 } 1732 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 1733 if (!v3) { 1734 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1735 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 1736 sp->sa_uid = nfs_xdrneg1; 1737 sp->sa_gid = nfs_xdrneg1; 1738 sp->sa_size = nfs_xdrneg1; 1739 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1740 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1741 } 1742 1743 /* 1744 * Issue the NFS request and get the rpc response. 1745 * 1746 * Only NFSv3 responses returning an error of 0 actually return 1747 * a file handle that can be converted into newvp without having 1748 * to do an extra lookup rpc. 1749 */ 1750 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred); 1751 if (v3) { 1752 if (error == 0) 1753 nfsm_mtofh(dvp, newvp, v3, gotvp); 1754 nfsm_wcc_data(dvp, wccflag); 1755 } 1756 1757 /* 1758 * out code jumps -> here, mrep is also freed. 1759 */ 1760 1761 m_freem(mrep); 1762 nfsmout: 1763 1764 /* 1765 * If we get an EEXIST error, silently convert it to no-error 1766 * in case of an NFS retry. 1767 */ 1768 if (error == EEXIST) 1769 error = 0; 1770 1771 /* 1772 * If we do not have (or no longer have) an error, and we could 1773 * not extract the newvp from the response due to the request being 1774 * NFSv2 or the error being EEXIST. We have to do a lookup in order 1775 * to obtain a newvp to return. 1776 */ 1777 if (error == 0 && newvp == NULL) { 1778 struct nfsnode *np = NULL; 1779 1780 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1781 cnp->cn_cred, cnp->cn_thread, &np); 1782 if (!error) 1783 newvp = NFSTOV(np); 1784 } 1785 if (error) { 1786 if (newvp) 1787 vput(newvp); 1788 } else { 1789 *ap->a_vpp = newvp; 1790 } 1791 VTONFS(dvp)->n_flag |= NMODIFIED; 1792 if (!wccflag) 1793 VTONFS(dvp)->n_attrstamp = 0; 1794 return (error); 1795 } 1796 1797 /* 1798 * nfs make dir call 1799 */ 1800 static int 1801 nfs_mkdir(struct vop_mkdir_args *ap) 1802 { 1803 struct vnode *dvp = ap->a_dvp; 1804 struct vattr *vap = ap->a_vap; 1805 struct componentname *cnp = ap->a_cnp; 1806 struct nfsv2_sattr *sp; 1807 int len; 1808 struct nfsnode *np = NULL; 1809 struct vnode *newvp = NULL; 1810 caddr_t bpos, dpos; 1811 int error = 0, wccflag = NFSV3_WCCRATTR; 1812 int gotvp = 0; 1813 struct mbuf *mreq, *mrep, *md, *mb; 1814 struct vattr vattr; 1815 int v3 = NFS_ISV3(dvp); 1816 1817 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1818 return (error); 1819 } 1820 len = cnp->cn_namelen; 1821 nfsstats.rpccnt[NFSPROC_MKDIR]++; 1822 mreq = nfsm_reqhead(dvp, NFSPROC_MKDIR, 1823 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 1824 mb = mreq; 1825 bpos = mtod(mb, caddr_t); 1826 nfsm_fhtom(dvp, v3); 1827 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1828 if (v3) { 1829 nfsm_v3attrbuild(vap, FALSE); 1830 } else { 1831 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1832 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 1833 sp->sa_uid = nfs_xdrneg1; 1834 sp->sa_gid = nfs_xdrneg1; 1835 sp->sa_size = nfs_xdrneg1; 1836 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1837 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1838 } 1839 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred); 1840 if (!error) 1841 nfsm_mtofh(dvp, newvp, v3, gotvp); 1842 if (v3) 1843 nfsm_wcc_data(dvp, wccflag); 1844 m_freem(mrep); 1845 nfsmout: 1846 VTONFS(dvp)->n_flag |= NMODIFIED; 1847 if (!wccflag) 1848 VTONFS(dvp)->n_attrstamp = 0; 1849 /* 1850 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 1851 * if we can succeed in looking up the directory. 1852 */ 1853 if (error == EEXIST || (!error && !gotvp)) { 1854 if (newvp) { 1855 vrele(newvp); 1856 newvp = NULL; 1857 } 1858 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 1859 cnp->cn_thread, &np); 1860 if (!error) { 1861 newvp = NFSTOV(np); 1862 if (newvp->v_type != VDIR) 1863 error = EEXIST; 1864 } 1865 } 1866 if (error) { 1867 if (newvp) 1868 vrele(newvp); 1869 } else 1870 *ap->a_vpp = newvp; 1871 return (error); 1872 } 1873 1874 /* 1875 * nfs remove directory call 1876 */ 1877 static int 1878 nfs_rmdir(struct vop_rmdir_args *ap) 1879 { 1880 struct vnode *vp = ap->a_vp; 1881 struct vnode *dvp = ap->a_dvp; 1882 struct componentname *cnp = ap->a_cnp; 1883 caddr_t bpos, dpos; 1884 int error = 0, wccflag = NFSV3_WCCRATTR; 1885 struct mbuf *mreq, *mrep, *md, *mb; 1886 int v3 = NFS_ISV3(dvp); 1887 1888 if (dvp == vp) 1889 return (EINVAL); 1890 nfsstats.rpccnt[NFSPROC_RMDIR]++; 1891 mreq = nfsm_reqhead(dvp, NFSPROC_RMDIR, 1892 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1893 mb = mreq; 1894 bpos = mtod(mb, caddr_t); 1895 nfsm_fhtom(dvp, v3); 1896 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1897 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred); 1898 if (v3) 1899 nfsm_wcc_data(dvp, wccflag); 1900 m_freem(mrep); 1901 nfsmout: 1902 VTONFS(dvp)->n_flag |= NMODIFIED; 1903 if (!wccflag) 1904 VTONFS(dvp)->n_attrstamp = 0; 1905 cache_purge(dvp); 1906 cache_purge(vp); 1907 /* 1908 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 1909 */ 1910 if (error == ENOENT) 1911 error = 0; 1912 return (error); 1913 } 1914 1915 /* 1916 * nfs readdir call 1917 */ 1918 static int 1919 nfs_readdir(struct vop_readdir_args *ap) 1920 { 1921 struct vnode *vp = ap->a_vp; 1922 struct nfsnode *np = VTONFS(vp); 1923 struct uio *uio = ap->a_uio; 1924 int tresid, error; 1925 struct vattr vattr; 1926 1927 if (vp->v_type != VDIR) 1928 return (EPERM); 1929 /* 1930 * First, check for hit on the EOF offset cache 1931 */ 1932 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 1933 (np->n_flag & NMODIFIED) == 0) { 1934 if (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_td) == 0 && 1935 np->n_mtime == vattr.va_mtime.tv_sec) { 1936 nfsstats.direofcache_hits++; 1937 return (0); 1938 } 1939 } 1940 1941 /* 1942 * Call nfs_bioread() to do the real work. 1943 */ 1944 tresid = uio->uio_resid; 1945 error = nfs_bioread(vp, uio, 0, ap->a_cred); 1946 1947 if (!error && uio->uio_resid == tresid) 1948 nfsstats.direofcache_misses++; 1949 return (error); 1950 } 1951 1952 /* 1953 * Readdir rpc call. 1954 * Called from below the buffer cache by nfs_doio(). 1955 */ 1956 int 1957 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1958 { 1959 int len, left; 1960 struct dirent *dp = NULL; 1961 u_int32_t *tl; 1962 caddr_t cp; 1963 nfsuint64 *cookiep; 1964 caddr_t bpos, dpos; 1965 struct mbuf *mreq, *mrep, *md, *mb; 1966 nfsuint64 cookie; 1967 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1968 struct nfsnode *dnp = VTONFS(vp); 1969 u_quad_t fileno; 1970 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 1971 int attrflag; 1972 int v3 = NFS_ISV3(vp); 1973 1974 #ifndef DIAGNOSTIC 1975 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 1976 (uiop->uio_resid & (DIRBLKSIZ - 1))) 1977 panic("nfs readdirrpc bad uio"); 1978 #endif 1979 1980 /* 1981 * If there is no cookie, assume directory was stale. 1982 */ 1983 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 1984 if (cookiep) 1985 cookie = *cookiep; 1986 else 1987 return (NFSERR_BAD_COOKIE); 1988 /* 1989 * Loop around doing readdir rpc's of size nm_readdirsize 1990 * truncated to a multiple of DIRBLKSIZ. 1991 * The stopping criteria is EOF or buffer full. 1992 */ 1993 while (more_dirs && bigenough) { 1994 nfsstats.rpccnt[NFSPROC_READDIR]++; 1995 mreq = nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 1996 NFSX_READDIR(v3)); 1997 mb = mreq; 1998 bpos = mtod(mb, caddr_t); 1999 nfsm_fhtom(vp, v3); 2000 if (v3) { 2001 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 2002 *tl++ = cookie.nfsuquad[0]; 2003 *tl++ = cookie.nfsuquad[1]; 2004 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2005 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2006 } else { 2007 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 2008 *tl++ = cookie.nfsuquad[0]; 2009 } 2010 *tl = txdr_unsigned(nmp->nm_readdirsize); 2011 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred); 2012 if (v3) { 2013 nfsm_postop_attr(vp, attrflag); 2014 if (!error) { 2015 tl = nfsm_dissect(u_int32_t *, 2016 2 * NFSX_UNSIGNED); 2017 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2018 dnp->n_cookieverf.nfsuquad[1] = *tl; 2019 } else { 2020 m_freem(mrep); 2021 goto nfsmout; 2022 } 2023 } 2024 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2025 more_dirs = fxdr_unsigned(int, *tl); 2026 2027 /* loop thru the dir entries, doctoring them to 4bsd form */ 2028 while (more_dirs && bigenough) { 2029 if (v3) { 2030 tl = nfsm_dissect(u_int32_t *, 2031 3 * NFSX_UNSIGNED); 2032 fileno = fxdr_hyper(tl); 2033 len = fxdr_unsigned(int, *(tl + 2)); 2034 } else { 2035 tl = nfsm_dissect(u_int32_t *, 2036 2 * NFSX_UNSIGNED); 2037 fileno = fxdr_unsigned(u_quad_t, *tl++); 2038 len = fxdr_unsigned(int, *tl); 2039 } 2040 if (len <= 0 || len > NFS_MAXNAMLEN) { 2041 error = EBADRPC; 2042 m_freem(mrep); 2043 goto nfsmout; 2044 } 2045 tlen = nfsm_rndup(len); 2046 if (tlen == len) 2047 tlen += 4; /* To ensure null termination */ 2048 left = DIRBLKSIZ - blksiz; 2049 if ((tlen + DIRHDSIZ) > left) { 2050 dp->d_reclen += left; 2051 uiop->uio_iov->iov_base = 2052 (char *)uiop->uio_iov->iov_base + left; 2053 uiop->uio_iov->iov_len -= left; 2054 uiop->uio_offset += left; 2055 uiop->uio_resid -= left; 2056 blksiz = 0; 2057 } 2058 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2059 bigenough = 0; 2060 if (bigenough) { 2061 dp = (struct dirent *)uiop->uio_iov->iov_base; 2062 dp->d_fileno = (int)fileno; 2063 dp->d_namlen = len; 2064 dp->d_reclen = tlen + DIRHDSIZ; 2065 dp->d_type = DT_UNKNOWN; 2066 blksiz += dp->d_reclen; 2067 if (blksiz == DIRBLKSIZ) 2068 blksiz = 0; 2069 uiop->uio_offset += DIRHDSIZ; 2070 uiop->uio_resid -= DIRHDSIZ; 2071 uiop->uio_iov->iov_base = 2072 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2073 uiop->uio_iov->iov_len -= DIRHDSIZ; 2074 nfsm_mtouio(uiop, len); 2075 cp = uiop->uio_iov->iov_base; 2076 tlen -= len; 2077 *cp = '\0'; /* null terminate */ 2078 uiop->uio_iov->iov_base = 2079 (char *)uiop->uio_iov->iov_base + tlen; 2080 uiop->uio_iov->iov_len -= tlen; 2081 uiop->uio_offset += tlen; 2082 uiop->uio_resid -= tlen; 2083 } else 2084 nfsm_adv(nfsm_rndup(len)); 2085 if (v3) { 2086 tl = nfsm_dissect(u_int32_t *, 2087 3 * NFSX_UNSIGNED); 2088 } else { 2089 tl = nfsm_dissect(u_int32_t *, 2090 2 * NFSX_UNSIGNED); 2091 } 2092 if (bigenough) { 2093 cookie.nfsuquad[0] = *tl++; 2094 if (v3) 2095 cookie.nfsuquad[1] = *tl++; 2096 } else if (v3) 2097 tl += 2; 2098 else 2099 tl++; 2100 more_dirs = fxdr_unsigned(int, *tl); 2101 } 2102 /* 2103 * If at end of rpc data, get the eof boolean 2104 */ 2105 if (!more_dirs) { 2106 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2107 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2108 } 2109 m_freem(mrep); 2110 } 2111 /* 2112 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2113 * by increasing d_reclen for the last record. 2114 */ 2115 if (blksiz > 0) { 2116 left = DIRBLKSIZ - blksiz; 2117 dp->d_reclen += left; 2118 uiop->uio_iov->iov_base = 2119 (char *)uiop->uio_iov->iov_base + left; 2120 uiop->uio_iov->iov_len -= left; 2121 uiop->uio_offset += left; 2122 uiop->uio_resid -= left; 2123 } 2124 2125 /* 2126 * We are now either at the end of the directory or have filled the 2127 * block. 2128 */ 2129 if (bigenough) 2130 dnp->n_direofoffset = uiop->uio_offset; 2131 else { 2132 if (uiop->uio_resid > 0) 2133 printf("EEK! readdirrpc resid > 0\n"); 2134 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2135 *cookiep = cookie; 2136 } 2137 nfsmout: 2138 return (error); 2139 } 2140 2141 /* 2142 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2143 */ 2144 int 2145 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2146 { 2147 int len, left; 2148 struct dirent *dp; 2149 u_int32_t *tl; 2150 caddr_t cp; 2151 struct vnode *newvp; 2152 nfsuint64 *cookiep; 2153 caddr_t bpos, dpos, dpossav1, dpossav2; 2154 struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2; 2155 struct nameidata nami, *ndp = &nami; 2156 struct componentname *cnp = &ndp->ni_cnd; 2157 nfsuint64 cookie; 2158 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2159 struct nfsnode *dnp = VTONFS(vp), *np; 2160 nfsfh_t *fhp; 2161 u_quad_t fileno; 2162 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2163 int attrflag, fhsize; 2164 2165 #ifndef nolint 2166 dp = NULL; 2167 #endif 2168 #ifndef DIAGNOSTIC 2169 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2170 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2171 panic("nfs readdirplusrpc bad uio"); 2172 #endif 2173 ndp->ni_dvp = vp; 2174 newvp = NULLVP; 2175 2176 /* 2177 * If there is no cookie, assume directory was stale. 2178 */ 2179 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2180 if (cookiep) 2181 cookie = *cookiep; 2182 else 2183 return (NFSERR_BAD_COOKIE); 2184 /* 2185 * Loop around doing readdir rpc's of size nm_readdirsize 2186 * truncated to a multiple of DIRBLKSIZ. 2187 * The stopping criteria is EOF or buffer full. 2188 */ 2189 while (more_dirs && bigenough) { 2190 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2191 mreq = nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2192 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2193 mb = mreq; 2194 bpos = mtod(mb, caddr_t); 2195 nfsm_fhtom(vp, 1); 2196 tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED); 2197 *tl++ = cookie.nfsuquad[0]; 2198 *tl++ = cookie.nfsuquad[1]; 2199 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2200 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2201 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2202 *tl = txdr_unsigned(nmp->nm_rsize); 2203 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred); 2204 nfsm_postop_attr(vp, attrflag); 2205 if (error) { 2206 m_freem(mrep); 2207 goto nfsmout; 2208 } 2209 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2210 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2211 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2212 more_dirs = fxdr_unsigned(int, *tl); 2213 2214 /* loop thru the dir entries, doctoring them to 4bsd form */ 2215 while (more_dirs && bigenough) { 2216 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2217 fileno = fxdr_hyper(tl); 2218 len = fxdr_unsigned(int, *(tl + 2)); 2219 if (len <= 0 || len > NFS_MAXNAMLEN) { 2220 error = EBADRPC; 2221 m_freem(mrep); 2222 goto nfsmout; 2223 } 2224 tlen = nfsm_rndup(len); 2225 if (tlen == len) 2226 tlen += 4; /* To ensure null termination*/ 2227 left = DIRBLKSIZ - blksiz; 2228 if ((tlen + DIRHDSIZ) > left) { 2229 dp->d_reclen += left; 2230 uiop->uio_iov->iov_base = 2231 (char *)uiop->uio_iov->iov_base + left; 2232 uiop->uio_iov->iov_len -= left; 2233 uiop->uio_offset += left; 2234 uiop->uio_resid -= left; 2235 blksiz = 0; 2236 } 2237 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2238 bigenough = 0; 2239 if (bigenough) { 2240 dp = (struct dirent *)uiop->uio_iov->iov_base; 2241 dp->d_fileno = (int)fileno; 2242 dp->d_namlen = len; 2243 dp->d_reclen = tlen + DIRHDSIZ; 2244 dp->d_type = DT_UNKNOWN; 2245 blksiz += dp->d_reclen; 2246 if (blksiz == DIRBLKSIZ) 2247 blksiz = 0; 2248 uiop->uio_offset += DIRHDSIZ; 2249 uiop->uio_resid -= DIRHDSIZ; 2250 uiop->uio_iov->iov_base = 2251 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2252 uiop->uio_iov->iov_len -= DIRHDSIZ; 2253 cnp->cn_nameptr = uiop->uio_iov->iov_base; 2254 cnp->cn_namelen = len; 2255 nfsm_mtouio(uiop, len); 2256 cp = uiop->uio_iov->iov_base; 2257 tlen -= len; 2258 *cp = '\0'; 2259 uiop->uio_iov->iov_base = 2260 (char *)uiop->uio_iov->iov_base + tlen; 2261 uiop->uio_iov->iov_len -= tlen; 2262 uiop->uio_offset += tlen; 2263 uiop->uio_resid -= tlen; 2264 } else 2265 nfsm_adv(nfsm_rndup(len)); 2266 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2267 if (bigenough) { 2268 cookie.nfsuquad[0] = *tl++; 2269 cookie.nfsuquad[1] = *tl++; 2270 } else 2271 tl += 2; 2272 2273 /* 2274 * Since the attributes are before the file handle 2275 * (sigh), we must skip over the attributes and then 2276 * come back and get them. 2277 */ 2278 attrflag = fxdr_unsigned(int, *tl); 2279 if (attrflag) { 2280 dpossav1 = dpos; 2281 mdsav1 = md; 2282 nfsm_adv(NFSX_V3FATTR); 2283 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2284 doit = fxdr_unsigned(int, *tl); 2285 if (doit) { 2286 nfsm_getfh(fhp, fhsize, 1); 2287 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2288 VREF(vp); 2289 newvp = vp; 2290 np = dnp; 2291 } else { 2292 error = nfs_nget(vp->v_mount, fhp, 2293 fhsize, &np); 2294 if (error) 2295 doit = 0; 2296 else 2297 newvp = NFSTOV(np); 2298 } 2299 } 2300 if (doit && bigenough) { 2301 dpossav2 = dpos; 2302 dpos = dpossav1; 2303 mdsav2 = md; 2304 md = mdsav1; 2305 nfsm_loadattr(newvp, NULL); 2306 dpos = dpossav2; 2307 md = mdsav2; 2308 dp->d_type = 2309 IFTODT(VTTOIF(np->n_vattr.va_type)); 2310 ndp->ni_vp = newvp; 2311 cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp); 2312 } 2313 } else { 2314 /* Just skip over the file handle */ 2315 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2316 i = fxdr_unsigned(int, *tl); 2317 nfsm_adv(nfsm_rndup(i)); 2318 } 2319 if (newvp != NULLVP) { 2320 if (newvp == vp) 2321 vrele(newvp); 2322 else 2323 vput(newvp); 2324 newvp = NULLVP; 2325 } 2326 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2327 more_dirs = fxdr_unsigned(int, *tl); 2328 } 2329 /* 2330 * If at end of rpc data, get the eof boolean 2331 */ 2332 if (!more_dirs) { 2333 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2334 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2335 } 2336 m_freem(mrep); 2337 } 2338 /* 2339 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2340 * by increasing d_reclen for the last record. 2341 */ 2342 if (blksiz > 0) { 2343 left = DIRBLKSIZ - blksiz; 2344 dp->d_reclen += left; 2345 uiop->uio_iov->iov_base = 2346 (char *)uiop->uio_iov->iov_base + left; 2347 uiop->uio_iov->iov_len -= left; 2348 uiop->uio_offset += left; 2349 uiop->uio_resid -= left; 2350 } 2351 2352 /* 2353 * We are now either at the end of the directory or have filled the 2354 * block. 2355 */ 2356 if (bigenough) 2357 dnp->n_direofoffset = uiop->uio_offset; 2358 else { 2359 if (uiop->uio_resid > 0) 2360 printf("EEK! readdirplusrpc resid > 0\n"); 2361 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2362 *cookiep = cookie; 2363 } 2364 nfsmout: 2365 if (newvp != NULLVP) { 2366 if (newvp == vp) 2367 vrele(newvp); 2368 else 2369 vput(newvp); 2370 newvp = NULLVP; 2371 } 2372 return (error); 2373 } 2374 2375 /* 2376 * Silly rename. To make the NFS filesystem that is stateless look a little 2377 * more like the "ufs" a remove of an active vnode is translated to a rename 2378 * to a funny looking filename that is removed by nfs_inactive on the 2379 * nfsnode. There is the potential for another process on a different client 2380 * to create the same funny name between the nfs_lookitup() fails and the 2381 * nfs_rename() completes, but... 2382 */ 2383 static int 2384 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2385 { 2386 struct sillyrename *sp; 2387 struct nfsnode *np; 2388 int error; 2389 short pid; 2390 2391 cache_purge(dvp); 2392 np = VTONFS(vp); 2393 #ifndef DIAGNOSTIC 2394 if (vp->v_type == VDIR) 2395 panic("nfs: sillyrename dir"); 2396 #endif 2397 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2398 M_NFSREQ, M_WAITOK); 2399 sp->s_cred = crhold(cnp->cn_cred); 2400 sp->s_dvp = dvp; 2401 sp->s_removeit = nfs_removeit; 2402 VREF(dvp); 2403 2404 /* Fudge together a funny name */ 2405 pid = cnp->cn_thread->td_proc->p_pid; 2406 sp->s_namlen = sprintf(sp->s_name, ".nfsA%04x4.4", pid); 2407 2408 /* Try lookitups until we get one that isn't there */ 2409 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2410 cnp->cn_thread, NULL) == 0) { 2411 sp->s_name[4]++; 2412 if (sp->s_name[4] > 'z') { 2413 error = EINVAL; 2414 goto bad; 2415 } 2416 } 2417 error = nfs_renameit(dvp, cnp, sp); 2418 if (error) 2419 goto bad; 2420 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2421 cnp->cn_thread, &np); 2422 np->n_sillyrename = sp; 2423 return (0); 2424 bad: 2425 vrele(sp->s_dvp); 2426 crfree(sp->s_cred); 2427 free((caddr_t)sp, M_NFSREQ); 2428 return (error); 2429 } 2430 2431 /* 2432 * Look up a file name and optionally either update the file handle or 2433 * allocate an nfsnode, depending on the value of npp. 2434 * npp == NULL --> just do the lookup 2435 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2436 * handled too 2437 * *npp != NULL --> update the file handle in the vnode 2438 */ 2439 static int 2440 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2441 struct thread *td, struct nfsnode **npp) 2442 { 2443 struct vnode *newvp = NULL; 2444 struct nfsnode *np, *dnp = VTONFS(dvp); 2445 caddr_t bpos, dpos; 2446 int error = 0, fhlen, attrflag; 2447 struct mbuf *mreq, *mrep, *md, *mb; 2448 nfsfh_t *nfhp; 2449 int v3 = NFS_ISV3(dvp); 2450 2451 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2452 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2453 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2454 mb = mreq; 2455 bpos = mtod(mb, caddr_t); 2456 nfsm_fhtom(dvp, v3); 2457 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2458 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2459 if (npp && !error) { 2460 nfsm_getfh(nfhp, fhlen, v3); 2461 if (*npp) { 2462 np = *npp; 2463 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2464 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2465 np->n_fhp = &np->n_fh; 2466 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2467 np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK); 2468 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2469 np->n_fhsize = fhlen; 2470 newvp = NFSTOV(np); 2471 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2472 VREF(dvp); 2473 newvp = dvp; 2474 } else { 2475 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2476 if (error) { 2477 m_freem(mrep); 2478 return (error); 2479 } 2480 newvp = NFSTOV(np); 2481 } 2482 if (v3) { 2483 nfsm_postop_attr(newvp, attrflag); 2484 if (!attrflag && *npp == NULL) { 2485 m_freem(mrep); 2486 if (newvp == dvp) 2487 vrele(newvp); 2488 else 2489 vput(newvp); 2490 return (ENOENT); 2491 } 2492 } else 2493 nfsm_loadattr(newvp, NULL); 2494 } 2495 m_freem(mrep); 2496 nfsmout: 2497 if (npp && *npp == NULL) { 2498 if (error) { 2499 if (newvp) { 2500 if (newvp == dvp) 2501 vrele(newvp); 2502 else 2503 vput(newvp); 2504 } 2505 } else 2506 *npp = np; 2507 } 2508 return (error); 2509 } 2510 2511 /* 2512 * Nfs Version 3 commit rpc 2513 */ 2514 int 2515 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2516 struct thread *td) 2517 { 2518 u_int32_t *tl; 2519 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2520 caddr_t bpos, dpos; 2521 int error = 0, wccflag = NFSV3_WCCRATTR; 2522 struct mbuf *mreq, *mrep, *md, *mb; 2523 2524 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 2525 return (0); 2526 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2527 mreq = nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2528 mb = mreq; 2529 bpos = mtod(mb, caddr_t); 2530 nfsm_fhtom(vp, 1); 2531 tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED); 2532 txdr_hyper(offset, tl); 2533 tl += 2; 2534 *tl = txdr_unsigned(cnt); 2535 nfsm_request(vp, NFSPROC_COMMIT, td, cred); 2536 nfsm_wcc_data(vp, wccflag); 2537 if (!error) { 2538 tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF); 2539 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2540 NFSX_V3WRITEVERF)) { 2541 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2542 NFSX_V3WRITEVERF); 2543 error = NFSERR_STALEWRITEVERF; 2544 } 2545 } 2546 m_freem(mrep); 2547 nfsmout: 2548 return (error); 2549 } 2550 2551 /* 2552 * Strategy routine. 2553 * For async requests when nfsiod(s) are running, queue the request by 2554 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2555 * request. 2556 */ 2557 static int 2558 nfs_strategy(struct vop_strategy_args *ap) 2559 { 2560 struct buf *bp = ap->a_bp; 2561 struct ucred *cr; 2562 struct thread *td; 2563 int error = 0; 2564 2565 KASSERT(ap->a_vp == ap->a_bp->b_vp, ("%s(%p != %p)", 2566 __func__, ap->a_vp, ap->a_bp->b_vp)); 2567 KASSERT(!(bp->b_flags & B_DONE), ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2568 KASSERT(BUF_REFCNT(bp) > 0, ("nfs_strategy: buffer %p not locked", bp)); 2569 2570 if (bp->b_flags & B_ASYNC) 2571 td = NULL; 2572 else 2573 td = curthread; /* XXX */ 2574 2575 if (bp->b_iocmd == BIO_READ) 2576 cr = bp->b_rcred; 2577 else 2578 cr = bp->b_wcred; 2579 2580 /* 2581 * If the op is asynchronous and an i/o daemon is waiting 2582 * queue the request, wake it up and wait for completion 2583 * otherwise just do it ourselves. 2584 */ 2585 if ((bp->b_flags & B_ASYNC) == 0 || 2586 nfs_asyncio(bp, NOCRED, td)) 2587 error = nfs_doio(bp, cr, td); 2588 return (error); 2589 } 2590 2591 /* 2592 * fsync vnode op. Just call nfs_flush() with commit == 1. 2593 */ 2594 /* ARGSUSED */ 2595 static int 2596 nfs_fsync(struct vop_fsync_args *ap) 2597 { 2598 2599 return (nfs_flush(ap->a_vp, ap->a_cred, ap->a_waitfor, ap->a_td, 1)); 2600 } 2601 2602 /* 2603 * Flush all the blocks associated with a vnode. 2604 * Walk through the buffer pool and push any dirty pages 2605 * associated with the vnode. 2606 */ 2607 static int 2608 nfs_flush(struct vnode *vp, struct ucred *cred, int waitfor, struct thread *td, 2609 int commit) 2610 { 2611 struct nfsnode *np = VTONFS(vp); 2612 struct buf *bp; 2613 int i; 2614 struct buf *nbp; 2615 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2616 int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2617 int passone = 1; 2618 u_quad_t off, endoff, toff; 2619 struct ucred* wcred = NULL; 2620 struct buf **bvec = NULL; 2621 #ifndef NFS_COMMITBVECSIZ 2622 #define NFS_COMMITBVECSIZ 20 2623 #endif 2624 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2625 int bvecsize = 0, bveccount; 2626 2627 if (nmp->nm_flag & NFSMNT_INT) 2628 slpflag = PCATCH; 2629 if (!commit) 2630 passone = 0; 2631 /* 2632 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2633 * server, but nas not been committed to stable storage on the server 2634 * yet. On the first pass, the byte range is worked out and the commit 2635 * rpc is done. On the second pass, nfs_writebp() is called to do the 2636 * job. 2637 */ 2638 again: 2639 off = (u_quad_t)-1; 2640 endoff = 0; 2641 bvecpos = 0; 2642 if (NFS_ISV3(vp) && commit) { 2643 s = splbio(); 2644 if (bvec != NULL && bvec != bvec_on_stack) 2645 free(bvec, M_TEMP); 2646 /* 2647 * Count up how many buffers waiting for a commit. 2648 */ 2649 bveccount = 0; 2650 VI_LOCK(vp); 2651 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2652 nbp = TAILQ_NEXT(bp, b_vnbufs); 2653 if (BUF_REFCNT(bp) == 0 && 2654 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2655 == (B_DELWRI | B_NEEDCOMMIT)) 2656 bveccount++; 2657 } 2658 /* 2659 * Allocate space to remember the list of bufs to commit. It is 2660 * important to use M_NOWAIT here to avoid a race with nfs_write. 2661 * If we can't get memory (for whatever reason), we will end up 2662 * committing the buffers one-by-one in the loop below. 2663 */ 2664 if (bveccount > NFS_COMMITBVECSIZ) { 2665 /* 2666 * Release the vnode interlock to avoid a lock 2667 * order reversal. 2668 */ 2669 VI_UNLOCK(vp); 2670 bvec = (struct buf **) 2671 malloc(bveccount * sizeof(struct buf *), 2672 M_TEMP, M_NOWAIT); 2673 VI_LOCK(vp); 2674 if (bvec == NULL) { 2675 bvec = bvec_on_stack; 2676 bvecsize = NFS_COMMITBVECSIZ; 2677 } else 2678 bvecsize = bveccount; 2679 } else { 2680 bvec = bvec_on_stack; 2681 bvecsize = NFS_COMMITBVECSIZ; 2682 } 2683 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2684 if (bvecpos >= bvecsize) 2685 break; 2686 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2687 nbp = TAILQ_NEXT(bp, b_vnbufs); 2688 continue; 2689 } 2690 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2691 (B_DELWRI | B_NEEDCOMMIT)) { 2692 BUF_UNLOCK(bp); 2693 nbp = TAILQ_NEXT(bp, b_vnbufs); 2694 continue; 2695 } 2696 VI_UNLOCK(vp); 2697 bremfree(bp); 2698 /* 2699 * Work out if all buffers are using the same cred 2700 * so we can deal with them all with one commit. 2701 * 2702 * NOTE: we are not clearing B_DONE here, so we have 2703 * to do it later on in this routine if we intend to 2704 * initiate I/O on the bp. 2705 * 2706 * Note: to avoid loopback deadlocks, we do not 2707 * assign b_runningbufspace. 2708 */ 2709 if (wcred == NULL) 2710 wcred = bp->b_wcred; 2711 else if (wcred != bp->b_wcred) 2712 wcred = NOCRED; 2713 bp->b_flags |= B_WRITEINPROG; 2714 vfs_busy_pages(bp, 1); 2715 2716 VI_LOCK(vp); 2717 /* 2718 * bp is protected by being locked, but nbp is not 2719 * and vfs_busy_pages() may sleep. We have to 2720 * recalculate nbp. 2721 */ 2722 nbp = TAILQ_NEXT(bp, b_vnbufs); 2723 2724 /* 2725 * A list of these buffers is kept so that the 2726 * second loop knows which buffers have actually 2727 * been committed. This is necessary, since there 2728 * may be a race between the commit rpc and new 2729 * uncommitted writes on the file. 2730 */ 2731 bvec[bvecpos++] = bp; 2732 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2733 bp->b_dirtyoff; 2734 if (toff < off) 2735 off = toff; 2736 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 2737 if (toff > endoff) 2738 endoff = toff; 2739 } 2740 splx(s); 2741 VI_UNLOCK(vp); 2742 } 2743 if (bvecpos > 0) { 2744 /* 2745 * Commit data on the server, as required. 2746 * If all bufs are using the same wcred, then use that with 2747 * one call for all of them, otherwise commit each one 2748 * separately. 2749 */ 2750 if (wcred != NOCRED) 2751 retv = nfs_commit(vp, off, (int)(endoff - off), 2752 wcred, td); 2753 else { 2754 retv = 0; 2755 for (i = 0; i < bvecpos; i++) { 2756 off_t off, size; 2757 bp = bvec[i]; 2758 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2759 bp->b_dirtyoff; 2760 size = (u_quad_t)(bp->b_dirtyend 2761 - bp->b_dirtyoff); 2762 retv = nfs_commit(vp, off, (int)size, 2763 bp->b_wcred, td); 2764 if (retv) break; 2765 } 2766 } 2767 2768 if (retv == NFSERR_STALEWRITEVERF) 2769 nfs_clearcommit(vp->v_mount); 2770 2771 /* 2772 * Now, either mark the blocks I/O done or mark the 2773 * blocks dirty, depending on whether the commit 2774 * succeeded. 2775 */ 2776 for (i = 0; i < bvecpos; i++) { 2777 bp = bvec[i]; 2778 bp->b_flags &= ~(B_NEEDCOMMIT | B_WRITEINPROG | B_CLUSTEROK); 2779 if (retv) { 2780 /* 2781 * Error, leave B_DELWRI intact 2782 */ 2783 vfs_unbusy_pages(bp); 2784 brelse(bp); 2785 } else { 2786 /* 2787 * Success, remove B_DELWRI ( bundirty() ). 2788 * 2789 * b_dirtyoff/b_dirtyend seem to be NFS 2790 * specific. We should probably move that 2791 * into bundirty(). XXX 2792 */ 2793 s = splbio(); 2794 VI_LOCK(vp); 2795 vp->v_numoutput++; 2796 VI_UNLOCK(vp); 2797 bp->b_flags |= B_ASYNC; 2798 bundirty(bp); 2799 bp->b_flags &= ~B_DONE; 2800 bp->b_ioflags &= ~BIO_ERROR; 2801 bp->b_dirtyoff = bp->b_dirtyend = 0; 2802 splx(s); 2803 bufdone(bp); 2804 } 2805 } 2806 } 2807 2808 /* 2809 * Start/do any write(s) that are required. 2810 */ 2811 loop: 2812 s = splbio(); 2813 VI_LOCK(vp); 2814 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2815 nbp = TAILQ_NEXT(bp, b_vnbufs); 2816 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2817 if (waitfor != MNT_WAIT || passone) 2818 continue; 2819 2820 error = BUF_TIMELOCK(bp, 2821 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 2822 VI_MTX(vp), "nfsfsync", slpflag, slptimeo); 2823 splx(s); 2824 if (error == 0) 2825 panic("nfs_fsync: inconsistent lock"); 2826 if (error == ENOLCK) 2827 goto loop; 2828 error = nfs_sigintr(nmp, NULL, td); 2829 if (error) 2830 goto done; 2831 if (slpflag == PCATCH) { 2832 slpflag = 0; 2833 slptimeo = 2 * hz; 2834 } 2835 goto loop; 2836 } 2837 if ((bp->b_flags & B_DELWRI) == 0) 2838 panic("nfs_fsync: not dirty"); 2839 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 2840 BUF_UNLOCK(bp); 2841 continue; 2842 } 2843 VI_UNLOCK(vp); 2844 bremfree(bp); 2845 if (passone || !commit) 2846 bp->b_flags |= B_ASYNC; 2847 else 2848 bp->b_flags |= B_ASYNC | B_WRITEINPROG; 2849 splx(s); 2850 bwrite(bp); 2851 goto loop; 2852 } 2853 splx(s); 2854 if (passone) { 2855 passone = 0; 2856 VI_UNLOCK(vp); 2857 goto again; 2858 } 2859 if (waitfor == MNT_WAIT) { 2860 while (vp->v_numoutput) { 2861 vp->v_iflag |= VI_BWAIT; 2862 error = msleep((caddr_t)&vp->v_numoutput, VI_MTX(vp), 2863 slpflag | (PRIBIO + 1), "nfsfsync", slptimeo); 2864 if (error) { 2865 VI_UNLOCK(vp); 2866 error = nfs_sigintr(nmp, NULL, td); 2867 if (error) 2868 goto done; 2869 if (slpflag == PCATCH) { 2870 slpflag = 0; 2871 slptimeo = 2 * hz; 2872 } 2873 VI_LOCK(vp); 2874 } 2875 } 2876 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) && commit) { 2877 VI_UNLOCK(vp); 2878 goto loop; 2879 } 2880 } 2881 VI_UNLOCK(vp); 2882 if (np->n_flag & NWRITEERR) { 2883 error = np->n_error; 2884 np->n_flag &= ~NWRITEERR; 2885 } 2886 done: 2887 if (bvec != NULL && bvec != bvec_on_stack) 2888 free(bvec, M_TEMP); 2889 return (error); 2890 } 2891 2892 /* 2893 * NFS advisory byte-level locks. 2894 */ 2895 static int 2896 nfs_advlock(struct vop_advlock_args *ap) 2897 { 2898 2899 if ((VFSTONFS(ap->a_vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 2900 struct nfsnode *np = VTONFS(ap->a_vp); 2901 2902 return (lf_advlock(ap, &(np->n_lockf), np->n_size)); 2903 } 2904 return (nfs_dolock(ap)); 2905 } 2906 2907 /* 2908 * Print out the contents of an nfsnode. 2909 */ 2910 static int 2911 nfs_print(struct vop_print_args *ap) 2912 { 2913 struct vnode *vp = ap->a_vp; 2914 struct nfsnode *np = VTONFS(vp); 2915 2916 printf("\tfileid %ld fsid 0x%x", 2917 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 2918 if (vp->v_type == VFIFO) 2919 fifo_printinfo(vp); 2920 printf("\n"); 2921 return (0); 2922 } 2923 2924 /* 2925 * This is the "real" nfs::bwrite(struct buf*). 2926 * B_WRITEINPROG isn't set unless the force flag is one and it 2927 * handles the B_NEEDCOMMIT flag. 2928 * We set B_CACHE if this is a VMIO buffer. 2929 */ 2930 int 2931 nfs_writebp(struct buf *bp, int force, struct thread *td) 2932 { 2933 int s; 2934 int oldflags = bp->b_flags; 2935 #if 0 2936 int retv = 1; 2937 off_t off; 2938 #endif 2939 2940 if (BUF_REFCNT(bp) == 0) 2941 panic("bwrite: buffer is not locked???"); 2942 2943 if (bp->b_flags & B_INVAL) { 2944 brelse(bp); 2945 return(0); 2946 } 2947 2948 bp->b_flags |= B_CACHE; 2949 2950 /* 2951 * Undirty the bp. We will redirty it later if the I/O fails. 2952 */ 2953 2954 s = splbio(); 2955 bundirty(bp); 2956 bp->b_flags &= ~B_DONE; 2957 bp->b_ioflags &= ~BIO_ERROR; 2958 bp->b_iocmd = BIO_WRITE; 2959 2960 VI_LOCK(bp->b_vp); 2961 bp->b_vp->v_numoutput++; 2962 VI_UNLOCK(bp->b_vp); 2963 curthread->td_proc->p_stats->p_ru.ru_oublock++; 2964 splx(s); 2965 2966 /* 2967 * Note: to avoid loopback deadlocks, we do not 2968 * assign b_runningbufspace. 2969 */ 2970 vfs_busy_pages(bp, 1); 2971 2972 if (force) 2973 bp->b_flags |= B_WRITEINPROG; 2974 BUF_KERNPROC(bp); 2975 bp->b_iooffset = dbtob(bp->b_blkno); 2976 VOP_STRATEGY(bp->b_vp, bp); 2977 2978 if( (oldflags & B_ASYNC) == 0) { 2979 int rtval = bufwait(bp); 2980 2981 if (oldflags & B_DELWRI) { 2982 s = splbio(); 2983 reassignbuf(bp); 2984 splx(s); 2985 } 2986 2987 brelse(bp); 2988 return (rtval); 2989 } 2990 2991 return (0); 2992 } 2993 2994 /* 2995 * nfs special file access vnode op. 2996 * Essentially just get vattr and then imitate iaccess() since the device is 2997 * local to the client. 2998 */ 2999 static int 3000 nfsspec_access(struct vop_access_args *ap) 3001 { 3002 struct vattr *vap; 3003 struct ucred *cred = ap->a_cred; 3004 struct vnode *vp = ap->a_vp; 3005 mode_t mode = ap->a_mode; 3006 struct vattr vattr; 3007 int error; 3008 3009 /* 3010 * Disallow write attempts on filesystems mounted read-only; 3011 * unless the file is a socket, fifo, or a block or character 3012 * device resident on the filesystem. 3013 */ 3014 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3015 switch (vp->v_type) { 3016 case VREG: 3017 case VDIR: 3018 case VLNK: 3019 return (EROFS); 3020 default: 3021 break; 3022 } 3023 } 3024 vap = &vattr; 3025 error = VOP_GETATTR(vp, vap, cred, ap->a_td); 3026 if (error) 3027 return (error); 3028 return (vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3029 mode, cred, NULL)); 3030 } 3031 3032 /* 3033 * Read wrapper for special devices. 3034 */ 3035 static int 3036 nfsspec_read(struct vop_read_args *ap) 3037 { 3038 struct nfsnode *np = VTONFS(ap->a_vp); 3039 3040 /* 3041 * Set access flag. 3042 */ 3043 np->n_flag |= NACC; 3044 getnanotime(&np->n_atim); 3045 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap)); 3046 } 3047 3048 /* 3049 * Write wrapper for special devices. 3050 */ 3051 static int 3052 nfsspec_write(struct vop_write_args *ap) 3053 { 3054 struct nfsnode *np = VTONFS(ap->a_vp); 3055 3056 /* 3057 * Set update flag. 3058 */ 3059 np->n_flag |= NUPD; 3060 getnanotime(&np->n_mtim); 3061 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap)); 3062 } 3063 3064 /* 3065 * Close wrapper for special devices. 3066 * 3067 * Update the times on the nfsnode then do device close. 3068 */ 3069 static int 3070 nfsspec_close(struct vop_close_args *ap) 3071 { 3072 struct vnode *vp = ap->a_vp; 3073 struct nfsnode *np = VTONFS(vp); 3074 struct vattr vattr; 3075 3076 if (np->n_flag & (NACC | NUPD)) { 3077 np->n_flag |= NCHG; 3078 if (vrefcnt(vp) == 1 && 3079 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3080 VATTR_NULL(&vattr); 3081 if (np->n_flag & NACC) 3082 vattr.va_atime = np->n_atim; 3083 if (np->n_flag & NUPD) 3084 vattr.va_mtime = np->n_mtim; 3085 (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_td); 3086 } 3087 } 3088 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 3089 } 3090 3091 /* 3092 * Read wrapper for fifos. 3093 */ 3094 static int 3095 nfsfifo_read(struct vop_read_args *ap) 3096 { 3097 struct nfsnode *np = VTONFS(ap->a_vp); 3098 3099 /* 3100 * Set access flag. 3101 */ 3102 np->n_flag |= NACC; 3103 getnanotime(&np->n_atim); 3104 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap)); 3105 } 3106 3107 /* 3108 * Write wrapper for fifos. 3109 */ 3110 static int 3111 nfsfifo_write(struct vop_write_args *ap) 3112 { 3113 struct nfsnode *np = VTONFS(ap->a_vp); 3114 3115 /* 3116 * Set update flag. 3117 */ 3118 np->n_flag |= NUPD; 3119 getnanotime(&np->n_mtim); 3120 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap)); 3121 } 3122 3123 /* 3124 * Close wrapper for fifos. 3125 * 3126 * Update the times on the nfsnode then do fifo close. 3127 */ 3128 static int 3129 nfsfifo_close(struct vop_close_args *ap) 3130 { 3131 struct vnode *vp = ap->a_vp; 3132 struct nfsnode *np = VTONFS(vp); 3133 struct vattr vattr; 3134 struct timespec ts; 3135 3136 if (np->n_flag & (NACC | NUPD)) { 3137 getnanotime(&ts); 3138 if (np->n_flag & NACC) 3139 np->n_atim = ts; 3140 if (np->n_flag & NUPD) 3141 np->n_mtim = ts; 3142 np->n_flag |= NCHG; 3143 if (vrefcnt(vp) == 1 && 3144 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3145 VATTR_NULL(&vattr); 3146 if (np->n_flag & NACC) 3147 vattr.va_atime = np->n_atim; 3148 if (np->n_flag & NUPD) 3149 vattr.va_mtime = np->n_mtim; 3150 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_td); 3151 (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_td); 3152 VOP_UNLOCK(vp, 0, ap->a_td); 3153 } 3154 } 3155 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 3156 } 3157
Cache object: 78a7c32cd8f6da4cec9bf17dd853d5e4
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