1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from nfs_vnops.c 8.16 (Berkeley) 5/27/95 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 /* 41 * vnode op calls for Sun NFS version 2, 3 and 4 42 */ 43 44 #include "opt_inet.h" 45 46 #include <sys/param.h> 47 #include <sys/kernel.h> 48 #include <sys/systm.h> 49 #include <sys/resourcevar.h> 50 #include <sys/proc.h> 51 #include <sys/mount.h> 52 #include <sys/bio.h> 53 #include <sys/buf.h> 54 #include <sys/jail.h> 55 #include <sys/malloc.h> 56 #include <sys/mbuf.h> 57 #include <sys/namei.h> 58 #include <sys/socket.h> 59 #include <sys/vnode.h> 60 #include <sys/dirent.h> 61 #include <sys/fcntl.h> 62 #include <sys/lockf.h> 63 #include <sys/stat.h> 64 #include <sys/sysctl.h> 65 #include <sys/signalvar.h> 66 67 #include <vm/vm.h> 68 #include <vm/vm_extern.h> 69 #include <vm/vm_object.h> 70 71 #include <fs/nfs/nfsport.h> 72 #include <fs/nfsclient/nfsnode.h> 73 #include <fs/nfsclient/nfsmount.h> 74 #include <fs/nfsclient/nfs.h> 75 #include <fs/nfsclient/nfs_kdtrace.h> 76 77 #include <net/if.h> 78 #include <netinet/in.h> 79 #include <netinet/in_var.h> 80 81 #include <nfs/nfs_lock.h> 82 83 #ifdef KDTRACE_HOOKS 84 #include <sys/dtrace_bsd.h> 85 86 dtrace_nfsclient_accesscache_flush_probe_func_t 87 dtrace_nfscl_accesscache_flush_done_probe; 88 uint32_t nfscl_accesscache_flush_done_id; 89 90 dtrace_nfsclient_accesscache_get_probe_func_t 91 dtrace_nfscl_accesscache_get_hit_probe, 92 dtrace_nfscl_accesscache_get_miss_probe; 93 uint32_t nfscl_accesscache_get_hit_id; 94 uint32_t nfscl_accesscache_get_miss_id; 95 96 dtrace_nfsclient_accesscache_load_probe_func_t 97 dtrace_nfscl_accesscache_load_done_probe; 98 uint32_t nfscl_accesscache_load_done_id; 99 #endif /* !KDTRACE_HOOKS */ 100 101 /* Defs */ 102 #define TRUE 1 103 #define FALSE 0 104 105 extern struct nfsstatsv1 nfsstatsv1; 106 extern int nfsrv_useacl; 107 extern int nfscl_debuglevel; 108 MALLOC_DECLARE(M_NEWNFSREQ); 109 110 static vop_read_t nfsfifo_read; 111 static vop_write_t nfsfifo_write; 112 static vop_close_t nfsfifo_close; 113 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *, 114 struct thread *); 115 static vop_lookup_t nfs_lookup; 116 static vop_create_t nfs_create; 117 static vop_mknod_t nfs_mknod; 118 static vop_open_t nfs_open; 119 static vop_pathconf_t nfs_pathconf; 120 static vop_close_t nfs_close; 121 static vop_access_t nfs_access; 122 static vop_getattr_t nfs_getattr; 123 static vop_setattr_t nfs_setattr; 124 static vop_read_t nfs_read; 125 static vop_fsync_t nfs_fsync; 126 static vop_remove_t nfs_remove; 127 static vop_link_t nfs_link; 128 static vop_rename_t nfs_rename; 129 static vop_mkdir_t nfs_mkdir; 130 static vop_rmdir_t nfs_rmdir; 131 static vop_symlink_t nfs_symlink; 132 static vop_readdir_t nfs_readdir; 133 static vop_strategy_t nfs_strategy; 134 static int nfs_lookitup(struct vnode *, char *, int, 135 struct ucred *, struct thread *, struct nfsnode **); 136 static int nfs_sillyrename(struct vnode *, struct vnode *, 137 struct componentname *); 138 static vop_access_t nfsspec_access; 139 static vop_readlink_t nfs_readlink; 140 static vop_print_t nfs_print; 141 static vop_advlock_t nfs_advlock; 142 static vop_advlockasync_t nfs_advlockasync; 143 static vop_getacl_t nfs_getacl; 144 static vop_setacl_t nfs_setacl; 145 static vop_lock1_t nfs_lock; 146 147 /* 148 * Global vfs data structures for nfs 149 */ 150 151 static struct vop_vector newnfs_vnodeops_nosig = { 152 .vop_default = &default_vnodeops, 153 .vop_access = nfs_access, 154 .vop_advlock = nfs_advlock, 155 .vop_advlockasync = nfs_advlockasync, 156 .vop_close = nfs_close, 157 .vop_create = nfs_create, 158 .vop_fsync = nfs_fsync, 159 .vop_getattr = nfs_getattr, 160 .vop_getpages = ncl_getpages, 161 .vop_putpages = ncl_putpages, 162 .vop_inactive = ncl_inactive, 163 .vop_link = nfs_link, 164 .vop_lock1 = nfs_lock, 165 .vop_lookup = nfs_lookup, 166 .vop_mkdir = nfs_mkdir, 167 .vop_mknod = nfs_mknod, 168 .vop_open = nfs_open, 169 .vop_pathconf = nfs_pathconf, 170 .vop_print = nfs_print, 171 .vop_read = nfs_read, 172 .vop_readdir = nfs_readdir, 173 .vop_readlink = nfs_readlink, 174 .vop_reclaim = ncl_reclaim, 175 .vop_remove = nfs_remove, 176 .vop_rename = nfs_rename, 177 .vop_rmdir = nfs_rmdir, 178 .vop_setattr = nfs_setattr, 179 .vop_strategy = nfs_strategy, 180 .vop_symlink = nfs_symlink, 181 .vop_write = ncl_write, 182 .vop_getacl = nfs_getacl, 183 .vop_setacl = nfs_setacl, 184 }; 185 186 static int 187 nfs_vnodeops_bypass(struct vop_generic_args *a) 188 { 189 190 return (vop_sigdefer(&newnfs_vnodeops_nosig, a)); 191 } 192 193 struct vop_vector newnfs_vnodeops = { 194 .vop_default = &default_vnodeops, 195 .vop_bypass = nfs_vnodeops_bypass, 196 }; 197 198 static struct vop_vector newnfs_fifoops_nosig = { 199 .vop_default = &fifo_specops, 200 .vop_access = nfsspec_access, 201 .vop_close = nfsfifo_close, 202 .vop_fsync = nfs_fsync, 203 .vop_getattr = nfs_getattr, 204 .vop_inactive = ncl_inactive, 205 .vop_pathconf = nfs_pathconf, 206 .vop_print = nfs_print, 207 .vop_read = nfsfifo_read, 208 .vop_reclaim = ncl_reclaim, 209 .vop_setattr = nfs_setattr, 210 .vop_write = nfsfifo_write, 211 }; 212 213 static int 214 nfs_fifoops_bypass(struct vop_generic_args *a) 215 { 216 217 return (vop_sigdefer(&newnfs_fifoops_nosig, a)); 218 } 219 220 struct vop_vector newnfs_fifoops = { 221 .vop_default = &default_vnodeops, 222 .vop_bypass = nfs_fifoops_bypass, 223 }; 224 225 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 226 struct componentname *cnp, struct vattr *vap); 227 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 228 int namelen, struct ucred *cred, struct thread *td); 229 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, 230 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp, 231 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td); 232 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp, 233 struct componentname *scnp, struct sillyrename *sp); 234 235 /* 236 * Global variables 237 */ 238 SYSCTL_DECL(_vfs_nfs); 239 240 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 241 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 242 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 243 244 static int nfs_prime_access_cache = 0; 245 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW, 246 &nfs_prime_access_cache, 0, 247 "Prime NFS ACCESS cache when fetching attributes"); 248 249 static int newnfs_commit_on_close = 0; 250 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW, 251 &newnfs_commit_on_close, 0, "write+commit on close, else only write"); 252 253 static int nfs_clean_pages_on_close = 1; 254 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, 255 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); 256 257 int newnfs_directio_enable = 0; 258 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 259 &newnfs_directio_enable, 0, "Enable NFS directio"); 260 261 int nfs_keep_dirty_on_error; 262 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW, 263 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned"); 264 265 /* 266 * This sysctl allows other processes to mmap a file that has been opened 267 * O_DIRECT by a process. In general, having processes mmap the file while 268 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 269 * this by default to prevent DoS attacks - to prevent a malicious user from 270 * opening up files O_DIRECT preventing other users from mmap'ing these 271 * files. "Protected" environments where stricter consistency guarantees are 272 * required can disable this knob. The process that opened the file O_DIRECT 273 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 274 * meaningful. 275 */ 276 int newnfs_directio_allow_mmap = 1; 277 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 278 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 279 280 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \ 281 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \ 282 | NFSACCESS_DELETE | NFSACCESS_LOOKUP) 283 284 /* 285 * SMP Locking Note : 286 * The list of locks after the description of the lock is the ordering 287 * of other locks acquired with the lock held. 288 * np->n_mtx : Protects the fields in the nfsnode. 289 VM Object Lock 290 VI_MTX (acquired indirectly) 291 * nmp->nm_mtx : Protects the fields in the nfsmount. 292 rep->r_mtx 293 * ncl_iod_mutex : Global lock, protects shared nfsiod state. 294 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. 295 nmp->nm_mtx 296 rep->r_mtx 297 * rep->r_mtx : Protects the fields in an nfsreq. 298 */ 299 300 static int 301 nfs_lock(struct vop_lock1_args *ap) 302 { 303 struct vnode *vp; 304 struct nfsnode *np; 305 u_quad_t nsize; 306 int error, lktype; 307 bool onfault; 308 309 vp = ap->a_vp; 310 lktype = ap->a_flags & LK_TYPE_MASK; 311 error = VOP_LOCK1_APV(&default_vnodeops, ap); 312 if (error != 0 || vp->v_op != &newnfs_vnodeops) 313 return (error); 314 np = VTONFS(vp); 315 if (np == NULL) 316 return (0); 317 NFSLOCKNODE(np); 318 if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED && 319 lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE && 320 lktype != LK_TRYUPGRADE)) { 321 NFSUNLOCKNODE(np); 322 return (0); 323 } 324 onfault = (ap->a_flags & LK_EATTR_MASK) == LK_NOWAIT && 325 (ap->a_flags & LK_INIT_MASK) == LK_CANRECURSE && 326 (lktype == LK_SHARED || lktype == LK_EXCLUSIVE); 327 if (onfault && vp->v_vnlock->lk_recurse == 0) { 328 /* 329 * Force retry in vm_fault(), to make the lock request 330 * sleepable, which allows us to piggy-back the 331 * sleepable call to vnode_pager_setsize(). 332 */ 333 NFSUNLOCKNODE(np); 334 VOP_UNLOCK(vp, 0); 335 return (EBUSY); 336 } 337 if ((ap->a_flags & LK_NOWAIT) != 0 || 338 (lktype == LK_SHARED && vp->v_vnlock->lk_recurse > 0)) { 339 NFSUNLOCKNODE(np); 340 return (0); 341 } 342 if (lktype == LK_SHARED) { 343 NFSUNLOCKNODE(np); 344 VOP_UNLOCK(vp, 0); 345 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 346 ap->a_flags |= LK_EXCLUSIVE; 347 error = VOP_LOCK1_APV(&default_vnodeops, ap); 348 if (error != 0 || vp->v_op != &newnfs_vnodeops) 349 return (error); 350 if (vp->v_data == NULL) 351 goto downgrade; 352 MPASS(vp->v_data == np); 353 NFSLOCKNODE(np); 354 if ((np->n_flag & NVNSETSZSKIP) == 0) { 355 NFSUNLOCKNODE(np); 356 goto downgrade; 357 } 358 } 359 np->n_flag &= ~NVNSETSZSKIP; 360 nsize = np->n_size; 361 NFSUNLOCKNODE(np); 362 vnode_pager_setsize(vp, nsize); 363 downgrade: 364 if (lktype == LK_SHARED) { 365 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 366 ap->a_flags |= LK_DOWNGRADE; 367 (void)VOP_LOCK1_APV(&default_vnodeops, ap); 368 } 369 return (0); 370 } 371 372 static int 373 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td, 374 struct ucred *cred, u_int32_t *retmode) 375 { 376 int error = 0, attrflag, i, lrupos; 377 u_int32_t rmode; 378 struct nfsnode *np = VTONFS(vp); 379 struct nfsvattr nfsva; 380 381 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag, 382 &rmode, NULL); 383 if (attrflag) 384 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 385 if (!error) { 386 lrupos = 0; 387 NFSLOCKNODE(np); 388 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 389 if (np->n_accesscache[i].uid == cred->cr_uid) { 390 np->n_accesscache[i].mode = rmode; 391 np->n_accesscache[i].stamp = time_second; 392 break; 393 } 394 if (i > 0 && np->n_accesscache[i].stamp < 395 np->n_accesscache[lrupos].stamp) 396 lrupos = i; 397 } 398 if (i == NFS_ACCESSCACHESIZE) { 399 np->n_accesscache[lrupos].uid = cred->cr_uid; 400 np->n_accesscache[lrupos].mode = rmode; 401 np->n_accesscache[lrupos].stamp = time_second; 402 } 403 NFSUNLOCKNODE(np); 404 if (retmode != NULL) 405 *retmode = rmode; 406 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0); 407 } else if (NFS_ISV4(vp)) { 408 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 409 } 410 #ifdef KDTRACE_HOOKS 411 if (error != 0) 412 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0, 413 error); 414 #endif 415 return (error); 416 } 417 418 /* 419 * nfs access vnode op. 420 * For nfs version 2, just return ok. File accesses may fail later. 421 * For nfs version 3, use the access rpc to check accessibility. If file modes 422 * are changed on the server, accesses might still fail later. 423 */ 424 static int 425 nfs_access(struct vop_access_args *ap) 426 { 427 struct vnode *vp = ap->a_vp; 428 int error = 0, i, gotahit; 429 u_int32_t mode, wmode, rmode; 430 int v34 = NFS_ISV34(vp); 431 struct nfsnode *np = VTONFS(vp); 432 433 /* 434 * Disallow write attempts on filesystems mounted read-only; 435 * unless the file is a socket, fifo, or a block or character 436 * device resident on the filesystem. 437 */ 438 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS | 439 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL | 440 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { 441 switch (vp->v_type) { 442 case VREG: 443 case VDIR: 444 case VLNK: 445 return (EROFS); 446 default: 447 break; 448 } 449 } 450 /* 451 * For nfs v3 or v4, check to see if we have done this recently, and if 452 * so return our cached result instead of making an ACCESS call. 453 * If not, do an access rpc, otherwise you are stuck emulating 454 * ufs_access() locally using the vattr. This may not be correct, 455 * since the server may apply other access criteria such as 456 * client uid-->server uid mapping that we do not know about. 457 */ 458 if (v34) { 459 if (ap->a_accmode & VREAD) 460 mode = NFSACCESS_READ; 461 else 462 mode = 0; 463 if (vp->v_type != VDIR) { 464 if (ap->a_accmode & VWRITE) 465 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 466 if (ap->a_accmode & VAPPEND) 467 mode |= NFSACCESS_EXTEND; 468 if (ap->a_accmode & VEXEC) 469 mode |= NFSACCESS_EXECUTE; 470 if (ap->a_accmode & VDELETE) 471 mode |= NFSACCESS_DELETE; 472 } else { 473 if (ap->a_accmode & VWRITE) 474 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 475 if (ap->a_accmode & VAPPEND) 476 mode |= NFSACCESS_EXTEND; 477 if (ap->a_accmode & VEXEC) 478 mode |= NFSACCESS_LOOKUP; 479 if (ap->a_accmode & VDELETE) 480 mode |= NFSACCESS_DELETE; 481 if (ap->a_accmode & VDELETE_CHILD) 482 mode |= NFSACCESS_MODIFY; 483 } 484 /* XXX safety belt, only make blanket request if caching */ 485 if (nfsaccess_cache_timeout > 0) { 486 wmode = NFSACCESS_READ | NFSACCESS_MODIFY | 487 NFSACCESS_EXTEND | NFSACCESS_EXECUTE | 488 NFSACCESS_DELETE | NFSACCESS_LOOKUP; 489 } else { 490 wmode = mode; 491 } 492 493 /* 494 * Does our cached result allow us to give a definite yes to 495 * this request? 496 */ 497 gotahit = 0; 498 NFSLOCKNODE(np); 499 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 500 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) { 501 if (time_second < (np->n_accesscache[i].stamp 502 + nfsaccess_cache_timeout) && 503 (np->n_accesscache[i].mode & mode) == mode) { 504 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits); 505 gotahit = 1; 506 } 507 break; 508 } 509 } 510 NFSUNLOCKNODE(np); 511 #ifdef KDTRACE_HOOKS 512 if (gotahit != 0) 513 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp, 514 ap->a_cred->cr_uid, mode); 515 else 516 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp, 517 ap->a_cred->cr_uid, mode); 518 #endif 519 if (gotahit == 0) { 520 /* 521 * Either a no, or a don't know. Go to the wire. 522 */ 523 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 524 error = nfs34_access_otw(vp, wmode, ap->a_td, 525 ap->a_cred, &rmode); 526 if (!error && 527 (rmode & mode) != mode) 528 error = EACCES; 529 } 530 return (error); 531 } else { 532 if ((error = nfsspec_access(ap)) != 0) { 533 return (error); 534 } 535 /* 536 * Attempt to prevent a mapped root from accessing a file 537 * which it shouldn't. We try to read a byte from the file 538 * if the user is root and the file is not zero length. 539 * After calling nfsspec_access, we should have the correct 540 * file size cached. 541 */ 542 NFSLOCKNODE(np); 543 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD) 544 && VTONFS(vp)->n_size > 0) { 545 struct iovec aiov; 546 struct uio auio; 547 char buf[1]; 548 549 NFSUNLOCKNODE(np); 550 aiov.iov_base = buf; 551 aiov.iov_len = 1; 552 auio.uio_iov = &aiov; 553 auio.uio_iovcnt = 1; 554 auio.uio_offset = 0; 555 auio.uio_resid = 1; 556 auio.uio_segflg = UIO_SYSSPACE; 557 auio.uio_rw = UIO_READ; 558 auio.uio_td = ap->a_td; 559 560 if (vp->v_type == VREG) 561 error = ncl_readrpc(vp, &auio, ap->a_cred); 562 else if (vp->v_type == VDIR) { 563 char* bp; 564 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 565 aiov.iov_base = bp; 566 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 567 error = ncl_readdirrpc(vp, &auio, ap->a_cred, 568 ap->a_td); 569 free(bp, M_TEMP); 570 } else if (vp->v_type == VLNK) 571 error = ncl_readlinkrpc(vp, &auio, ap->a_cred); 572 else 573 error = EACCES; 574 } else 575 NFSUNLOCKNODE(np); 576 return (error); 577 } 578 } 579 580 581 /* 582 * nfs open vnode op 583 * Check to see if the type is ok 584 * and that deletion is not in progress. 585 * For paged in text files, you will need to flush the page cache 586 * if consistency is lost. 587 */ 588 /* ARGSUSED */ 589 static int 590 nfs_open(struct vop_open_args *ap) 591 { 592 struct vnode *vp = ap->a_vp; 593 struct nfsnode *np = VTONFS(vp); 594 struct vattr vattr; 595 int error; 596 int fmode = ap->a_mode; 597 struct ucred *cred; 598 vm_object_t obj; 599 600 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 601 return (EOPNOTSUPP); 602 603 /* 604 * For NFSv4, we need to do the Open Op before cache validation, 605 * so that we conform to RFC3530 Sec. 9.3.1. 606 */ 607 if (NFS_ISV4(vp)) { 608 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td); 609 if (error) { 610 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 611 (gid_t)0); 612 return (error); 613 } 614 } 615 616 /* 617 * Now, if this Open will be doing reading, re-validate/flush the 618 * cache, so that Close/Open coherency is maintained. 619 */ 620 NFSLOCKNODE(np); 621 if (np->n_flag & NMODIFIED) { 622 NFSUNLOCKNODE(np); 623 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 624 if (error == EINTR || error == EIO) { 625 if (NFS_ISV4(vp)) 626 (void) nfsrpc_close(vp, 0, ap->a_td); 627 return (error); 628 } 629 NFSLOCKNODE(np); 630 np->n_attrstamp = 0; 631 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 632 if (vp->v_type == VDIR) 633 np->n_direofoffset = 0; 634 NFSUNLOCKNODE(np); 635 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 636 if (error) { 637 if (NFS_ISV4(vp)) 638 (void) nfsrpc_close(vp, 0, ap->a_td); 639 return (error); 640 } 641 NFSLOCKNODE(np); 642 np->n_mtime = vattr.va_mtime; 643 if (NFS_ISV4(vp)) 644 np->n_change = vattr.va_filerev; 645 } else { 646 NFSUNLOCKNODE(np); 647 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 648 if (error) { 649 if (NFS_ISV4(vp)) 650 (void) nfsrpc_close(vp, 0, ap->a_td); 651 return (error); 652 } 653 NFSLOCKNODE(np); 654 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) || 655 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 656 if (vp->v_type == VDIR) 657 np->n_direofoffset = 0; 658 NFSUNLOCKNODE(np); 659 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 660 if (error == EINTR || error == EIO) { 661 if (NFS_ISV4(vp)) 662 (void) nfsrpc_close(vp, 0, ap->a_td); 663 return (error); 664 } 665 NFSLOCKNODE(np); 666 np->n_mtime = vattr.va_mtime; 667 if (NFS_ISV4(vp)) 668 np->n_change = vattr.va_filerev; 669 } 670 } 671 672 /* 673 * If the object has >= 1 O_DIRECT active opens, we disable caching. 674 */ 675 if (newnfs_directio_enable && (fmode & O_DIRECT) && 676 (vp->v_type == VREG)) { 677 if (np->n_directio_opens == 0) { 678 NFSUNLOCKNODE(np); 679 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 680 if (error) { 681 if (NFS_ISV4(vp)) 682 (void) nfsrpc_close(vp, 0, ap->a_td); 683 return (error); 684 } 685 NFSLOCKNODE(np); 686 np->n_flag |= NNONCACHE; 687 } 688 np->n_directio_opens++; 689 } 690 691 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */ 692 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0) 693 np->n_flag |= NWRITEOPENED; 694 695 /* 696 * If this is an open for writing, capture a reference to the 697 * credentials, so they can be used by ncl_putpages(). Using 698 * these write credentials is preferable to the credentials of 699 * whatever thread happens to be doing the VOP_PUTPAGES() since 700 * the write RPCs are less likely to fail with EACCES. 701 */ 702 if ((fmode & FWRITE) != 0) { 703 cred = np->n_writecred; 704 np->n_writecred = crhold(ap->a_cred); 705 } else 706 cred = NULL; 707 NFSUNLOCKNODE(np); 708 709 if (cred != NULL) 710 crfree(cred); 711 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 712 713 /* 714 * If the text file has been mmap'd, flush any dirty pages to the 715 * buffer cache and then... 716 * Make sure all writes are pushed to the NFS server. If this is not 717 * done, the modify time of the file can change while the text 718 * file is being executed. This will cause the process that is 719 * executing the text file to be terminated. 720 */ 721 if (vp->v_writecount <= -1) { 722 if ((obj = vp->v_object) != NULL && 723 vm_object_mightbedirty(obj)) { 724 VM_OBJECT_WLOCK(obj); 725 vm_object_page_clean(obj, 0, 0, OBJPC_SYNC); 726 VM_OBJECT_WUNLOCK(obj); 727 } 728 729 /* Now, flush the buffer cache. */ 730 ncl_flush(vp, MNT_WAIT, curthread, 0, 0); 731 732 /* And, finally, make sure that n_mtime is up to date. */ 733 np = VTONFS(vp); 734 NFSLOCKNODE(np); 735 np->n_mtime = np->n_vattr.na_mtime; 736 NFSUNLOCKNODE(np); 737 } 738 return (0); 739 } 740 741 /* 742 * nfs close vnode op 743 * What an NFS client should do upon close after writing is a debatable issue. 744 * Most NFS clients push delayed writes to the server upon close, basically for 745 * two reasons: 746 * 1 - So that any write errors may be reported back to the client process 747 * doing the close system call. By far the two most likely errors are 748 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 749 * 2 - To put a worst case upper bound on cache inconsistency between 750 * multiple clients for the file. 751 * There is also a consistency problem for Version 2 of the protocol w.r.t. 752 * not being able to tell if other clients are writing a file concurrently, 753 * since there is no way of knowing if the changed modify time in the reply 754 * is only due to the write for this client. 755 * (NFS Version 3 provides weak cache consistency data in the reply that 756 * should be sufficient to detect and handle this case.) 757 * 758 * The current code does the following: 759 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 760 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 761 * or commit them (this satisfies 1 and 2 except for the 762 * case where the server crashes after this close but 763 * before the commit RPC, which is felt to be "good 764 * enough". Changing the last argument to ncl_flush() to 765 * a 1 would force a commit operation, if it is felt a 766 * commit is necessary now. 767 * for NFS Version 4 - flush the dirty buffers and commit them, if 768 * nfscl_mustflush() says this is necessary. 769 * It is necessary if there is no write delegation held, 770 * in order to satisfy open/close coherency. 771 * If the file isn't cached on local stable storage, 772 * it may be necessary in order to detect "out of space" 773 * errors from the server, if the write delegation 774 * issued by the server doesn't allow the file to grow. 775 */ 776 /* ARGSUSED */ 777 static int 778 nfs_close(struct vop_close_args *ap) 779 { 780 struct vnode *vp = ap->a_vp; 781 struct nfsnode *np = VTONFS(vp); 782 struct nfsvattr nfsva; 783 struct ucred *cred; 784 int error = 0, ret, localcred = 0; 785 int fmode = ap->a_fflag; 786 787 if (NFSCL_FORCEDISM(vp->v_mount)) 788 return (0); 789 /* 790 * During shutdown, a_cred isn't valid, so just use root. 791 */ 792 if (ap->a_cred == NOCRED) { 793 cred = newnfs_getcred(); 794 localcred = 1; 795 } else { 796 cred = ap->a_cred; 797 } 798 if (vp->v_type == VREG) { 799 /* 800 * Examine and clean dirty pages, regardless of NMODIFIED. 801 * This closes a major hole in close-to-open consistency. 802 * We want to push out all dirty pages (and buffers) on 803 * close, regardless of whether they were dirtied by 804 * mmap'ed writes or via write(). 805 */ 806 if (nfs_clean_pages_on_close && vp->v_object) { 807 VM_OBJECT_WLOCK(vp->v_object); 808 vm_object_page_clean(vp->v_object, 0, 0, 0); 809 VM_OBJECT_WUNLOCK(vp->v_object); 810 } 811 NFSLOCKNODE(np); 812 if (np->n_flag & NMODIFIED) { 813 NFSUNLOCKNODE(np); 814 if (NFS_ISV3(vp)) { 815 /* 816 * Under NFSv3 we have dirty buffers to dispose of. We 817 * must flush them to the NFS server. We have the option 818 * of waiting all the way through the commit rpc or just 819 * waiting for the initial write. The default is to only 820 * wait through the initial write so the data is in the 821 * server's cache, which is roughly similar to the state 822 * a standard disk subsystem leaves the file in on close(). 823 * 824 * We cannot clear the NMODIFIED bit in np->n_flag due to 825 * potential races with other processes, and certainly 826 * cannot clear it if we don't commit. 827 * These races occur when there is no longer the old 828 * traditional vnode locking implemented for Vnode Ops. 829 */ 830 int cm = newnfs_commit_on_close ? 1 : 0; 831 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0); 832 /* np->n_flag &= ~NMODIFIED; */ 833 } else if (NFS_ISV4(vp)) { 834 if (nfscl_mustflush(vp) != 0) { 835 int cm = newnfs_commit_on_close ? 1 : 0; 836 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 837 cm, 0); 838 /* 839 * as above w.r.t races when clearing 840 * NMODIFIED. 841 * np->n_flag &= ~NMODIFIED; 842 */ 843 } 844 } else { 845 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 846 } 847 NFSLOCKNODE(np); 848 } 849 /* 850 * Invalidate the attribute cache in all cases. 851 * An open is going to fetch fresh attrs any way, other procs 852 * on this node that have file open will be forced to do an 853 * otw attr fetch, but this is safe. 854 * --> A user found that their RPC count dropped by 20% when 855 * this was commented out and I can't see any requirement 856 * for it, so I've disabled it when negative lookups are 857 * enabled. (What does this have to do with negative lookup 858 * caching? Well nothing, except it was reported by the 859 * same user that needed negative lookup caching and I wanted 860 * there to be a way to disable it to see if it 861 * is the cause of some caching/coherency issue that might 862 * crop up.) 863 */ 864 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) { 865 np->n_attrstamp = 0; 866 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 867 } 868 if (np->n_flag & NWRITEERR) { 869 np->n_flag &= ~NWRITEERR; 870 error = np->n_error; 871 } 872 NFSUNLOCKNODE(np); 873 } 874 875 if (NFS_ISV4(vp)) { 876 /* 877 * Get attributes so "change" is up to date. 878 */ 879 if (error == 0 && nfscl_mustflush(vp) != 0 && 880 vp->v_type == VREG && 881 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) { 882 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva, 883 NULL); 884 if (!ret) { 885 np->n_change = nfsva.na_filerev; 886 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 887 NULL, 0, 0); 888 } 889 } 890 891 /* 892 * and do the close. 893 */ 894 ret = nfsrpc_close(vp, 0, ap->a_td); 895 if (!error && ret) 896 error = ret; 897 if (error) 898 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 899 (gid_t)0); 900 } 901 if (newnfs_directio_enable) 902 KASSERT((np->n_directio_asyncwr == 0), 903 ("nfs_close: dirty unflushed (%d) directio buffers\n", 904 np->n_directio_asyncwr)); 905 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 906 NFSLOCKNODE(np); 907 KASSERT((np->n_directio_opens > 0), 908 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 909 np->n_directio_opens--; 910 if (np->n_directio_opens == 0) 911 np->n_flag &= ~NNONCACHE; 912 NFSUNLOCKNODE(np); 913 } 914 if (localcred) 915 NFSFREECRED(cred); 916 return (error); 917 } 918 919 /* 920 * nfs getattr call from vfs. 921 */ 922 static int 923 nfs_getattr(struct vop_getattr_args *ap) 924 { 925 struct vnode *vp = ap->a_vp; 926 struct thread *td = curthread; /* XXX */ 927 struct nfsnode *np = VTONFS(vp); 928 int error = 0; 929 struct nfsvattr nfsva; 930 struct vattr *vap = ap->a_vap; 931 struct vattr vattr; 932 933 /* 934 * Update local times for special files. 935 */ 936 NFSLOCKNODE(np); 937 if (np->n_flag & (NACC | NUPD)) 938 np->n_flag |= NCHG; 939 NFSUNLOCKNODE(np); 940 /* 941 * First look in the cache. 942 */ 943 if (ncl_getattrcache(vp, &vattr) == 0) { 944 vap->va_type = vattr.va_type; 945 vap->va_mode = vattr.va_mode; 946 vap->va_nlink = vattr.va_nlink; 947 vap->va_uid = vattr.va_uid; 948 vap->va_gid = vattr.va_gid; 949 vap->va_fsid = vattr.va_fsid; 950 vap->va_fileid = vattr.va_fileid; 951 vap->va_size = vattr.va_size; 952 vap->va_blocksize = vattr.va_blocksize; 953 vap->va_atime = vattr.va_atime; 954 vap->va_mtime = vattr.va_mtime; 955 vap->va_ctime = vattr.va_ctime; 956 vap->va_gen = vattr.va_gen; 957 vap->va_flags = vattr.va_flags; 958 vap->va_rdev = vattr.va_rdev; 959 vap->va_bytes = vattr.va_bytes; 960 vap->va_filerev = vattr.va_filerev; 961 /* 962 * Get the local modify time for the case of a write 963 * delegation. 964 */ 965 nfscl_deleggetmodtime(vp, &vap->va_mtime); 966 return (0); 967 } 968 969 if (NFS_ISV34(vp) && nfs_prime_access_cache && 970 nfsaccess_cache_timeout > 0) { 971 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 972 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL); 973 if (ncl_getattrcache(vp, ap->a_vap) == 0) { 974 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime); 975 return (0); 976 } 977 } 978 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL); 979 if (!error) 980 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0); 981 if (!error) { 982 /* 983 * Get the local modify time for the case of a write 984 * delegation. 985 */ 986 nfscl_deleggetmodtime(vp, &vap->va_mtime); 987 } else if (NFS_ISV4(vp)) { 988 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 989 } 990 return (error); 991 } 992 993 /* 994 * nfs setattr call. 995 */ 996 static int 997 nfs_setattr(struct vop_setattr_args *ap) 998 { 999 struct vnode *vp = ap->a_vp; 1000 struct nfsnode *np = VTONFS(vp); 1001 struct thread *td = curthread; /* XXX */ 1002 struct vattr *vap = ap->a_vap; 1003 int error = 0; 1004 u_quad_t tsize; 1005 1006 #ifndef nolint 1007 tsize = (u_quad_t)0; 1008 #endif 1009 1010 /* 1011 * Setting of flags and marking of atimes are not supported. 1012 */ 1013 if (vap->va_flags != VNOVAL) 1014 return (EOPNOTSUPP); 1015 1016 /* 1017 * Disallow write attempts if the filesystem is mounted read-only. 1018 */ 1019 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 1020 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 1021 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 1022 (vp->v_mount->mnt_flag & MNT_RDONLY)) 1023 return (EROFS); 1024 if (vap->va_size != VNOVAL) { 1025 switch (vp->v_type) { 1026 case VDIR: 1027 return (EISDIR); 1028 case VCHR: 1029 case VBLK: 1030 case VSOCK: 1031 case VFIFO: 1032 if (vap->va_mtime.tv_sec == VNOVAL && 1033 vap->va_atime.tv_sec == VNOVAL && 1034 vap->va_mode == (mode_t)VNOVAL && 1035 vap->va_uid == (uid_t)VNOVAL && 1036 vap->va_gid == (gid_t)VNOVAL) 1037 return (0); 1038 vap->va_size = VNOVAL; 1039 break; 1040 default: 1041 /* 1042 * Disallow write attempts if the filesystem is 1043 * mounted read-only. 1044 */ 1045 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1046 return (EROFS); 1047 /* 1048 * We run vnode_pager_setsize() early (why?), 1049 * we must set np->n_size now to avoid vinvalbuf 1050 * V_SAVE races that might setsize a lower 1051 * value. 1052 */ 1053 NFSLOCKNODE(np); 1054 tsize = np->n_size; 1055 NFSUNLOCKNODE(np); 1056 error = ncl_meta_setsize(vp, td, vap->va_size); 1057 NFSLOCKNODE(np); 1058 if (np->n_flag & NMODIFIED) { 1059 tsize = np->n_size; 1060 NFSUNLOCKNODE(np); 1061 error = ncl_vinvalbuf(vp, vap->va_size == 0 ? 1062 0 : V_SAVE, td, 1); 1063 if (error != 0) { 1064 vnode_pager_setsize(vp, tsize); 1065 return (error); 1066 } 1067 /* 1068 * Call nfscl_delegmodtime() to set the modify time 1069 * locally, as required. 1070 */ 1071 nfscl_delegmodtime(vp); 1072 } else 1073 NFSUNLOCKNODE(np); 1074 /* 1075 * np->n_size has already been set to vap->va_size 1076 * in ncl_meta_setsize(). We must set it again since 1077 * nfs_loadattrcache() could be called through 1078 * ncl_meta_setsize() and could modify np->n_size. 1079 */ 1080 NFSLOCKNODE(np); 1081 np->n_vattr.na_size = np->n_size = vap->va_size; 1082 NFSUNLOCKNODE(np); 1083 } 1084 } else { 1085 NFSLOCKNODE(np); 1086 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 1087 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 1088 NFSUNLOCKNODE(np); 1089 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 1090 if (error == EINTR || error == EIO) 1091 return (error); 1092 } else 1093 NFSUNLOCKNODE(np); 1094 } 1095 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 1096 if (error && vap->va_size != VNOVAL) { 1097 NFSLOCKNODE(np); 1098 np->n_size = np->n_vattr.na_size = tsize; 1099 vnode_pager_setsize(vp, tsize); 1100 NFSUNLOCKNODE(np); 1101 } 1102 return (error); 1103 } 1104 1105 /* 1106 * Do an nfs setattr rpc. 1107 */ 1108 static int 1109 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 1110 struct thread *td) 1111 { 1112 struct nfsnode *np = VTONFS(vp); 1113 int error, ret, attrflag, i; 1114 struct nfsvattr nfsva; 1115 1116 if (NFS_ISV34(vp)) { 1117 NFSLOCKNODE(np); 1118 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) 1119 np->n_accesscache[i].stamp = 0; 1120 np->n_flag |= NDELEGMOD; 1121 NFSUNLOCKNODE(np); 1122 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); 1123 } 1124 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag, 1125 NULL); 1126 if (attrflag) { 1127 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1128 if (ret && !error) 1129 error = ret; 1130 } 1131 if (error && NFS_ISV4(vp)) 1132 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid); 1133 return (error); 1134 } 1135 1136 /* 1137 * nfs lookup call, one step at a time... 1138 * First look in cache 1139 * If not found, unlock the directory nfsnode and do the rpc 1140 */ 1141 static int 1142 nfs_lookup(struct vop_lookup_args *ap) 1143 { 1144 struct componentname *cnp = ap->a_cnp; 1145 struct vnode *dvp = ap->a_dvp; 1146 struct vnode **vpp = ap->a_vpp; 1147 struct mount *mp = dvp->v_mount; 1148 int flags = cnp->cn_flags; 1149 struct vnode *newvp; 1150 struct nfsmount *nmp; 1151 struct nfsnode *np, *newnp; 1152 int error = 0, attrflag, dattrflag, ltype, ncticks; 1153 struct thread *td = cnp->cn_thread; 1154 struct nfsfh *nfhp; 1155 struct nfsvattr dnfsva, nfsva; 1156 struct vattr vattr; 1157 struct timespec nctime; 1158 1159 *vpp = NULLVP; 1160 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) && 1161 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 1162 return (EROFS); 1163 if (dvp->v_type != VDIR) 1164 return (ENOTDIR); 1165 nmp = VFSTONFS(mp); 1166 np = VTONFS(dvp); 1167 1168 /* For NFSv4, wait until any remove is done. */ 1169 NFSLOCKNODE(np); 1170 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) { 1171 np->n_flag |= NREMOVEWANT; 1172 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0); 1173 } 1174 NFSUNLOCKNODE(np); 1175 1176 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) 1177 return (error); 1178 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks); 1179 if (error > 0 && error != ENOENT) 1180 return (error); 1181 if (error == -1) { 1182 /* 1183 * Lookups of "." are special and always return the 1184 * current directory. cache_lookup() already handles 1185 * associated locking bookkeeping, etc. 1186 */ 1187 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 1188 /* XXX: Is this really correct? */ 1189 if (cnp->cn_nameiop != LOOKUP && 1190 (flags & ISLASTCN)) 1191 cnp->cn_flags |= SAVENAME; 1192 return (0); 1193 } 1194 1195 /* 1196 * We only accept a positive hit in the cache if the 1197 * change time of the file matches our cached copy. 1198 * Otherwise, we discard the cache entry and fallback 1199 * to doing a lookup RPC. We also only trust cache 1200 * entries for less than nm_nametimeo seconds. 1201 * 1202 * To better handle stale file handles and attributes, 1203 * clear the attribute cache of this node if it is a 1204 * leaf component, part of an open() call, and not 1205 * locally modified before fetching the attributes. 1206 * This should allow stale file handles to be detected 1207 * here where we can fall back to a LOOKUP RPC to 1208 * recover rather than having nfs_open() detect the 1209 * stale file handle and failing open(2) with ESTALE. 1210 */ 1211 newvp = *vpp; 1212 newnp = VTONFS(newvp); 1213 if (!(nmp->nm_flag & NFSMNT_NOCTO) && 1214 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1215 !(newnp->n_flag & NMODIFIED)) { 1216 NFSLOCKNODE(newnp); 1217 newnp->n_attrstamp = 0; 1218 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1219 NFSUNLOCKNODE(newnp); 1220 } 1221 if (nfscl_nodeleg(newvp, 0) == 0 || 1222 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) && 1223 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 && 1224 timespeccmp(&vattr.va_ctime, &nctime, ==))) { 1225 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1226 if (cnp->cn_nameiop != LOOKUP && 1227 (flags & ISLASTCN)) 1228 cnp->cn_flags |= SAVENAME; 1229 return (0); 1230 } 1231 cache_purge(newvp); 1232 if (dvp != newvp) 1233 vput(newvp); 1234 else 1235 vrele(newvp); 1236 *vpp = NULLVP; 1237 } else if (error == ENOENT) { 1238 if (VN_IS_DOOMED(dvp)) 1239 return (ENOENT); 1240 /* 1241 * We only accept a negative hit in the cache if the 1242 * modification time of the parent directory matches 1243 * the cached copy in the name cache entry. 1244 * Otherwise, we discard all of the negative cache 1245 * entries for this directory. We also only trust 1246 * negative cache entries for up to nm_negnametimeo 1247 * seconds. 1248 */ 1249 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) && 1250 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && 1251 timespeccmp(&vattr.va_mtime, &nctime, ==)) { 1252 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1253 return (ENOENT); 1254 } 1255 cache_purge_negative(dvp); 1256 } 1257 1258 newvp = NULLVP; 1259 NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses); 1260 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1261 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1262 NULL); 1263 if (dattrflag) 1264 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1265 if (error) { 1266 if (newvp != NULLVP) { 1267 vput(newvp); 1268 *vpp = NULLVP; 1269 } 1270 1271 if (error != ENOENT) { 1272 if (NFS_ISV4(dvp)) 1273 error = nfscl_maperr(td, error, (uid_t)0, 1274 (gid_t)0); 1275 return (error); 1276 } 1277 1278 /* The requested file was not found. */ 1279 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1280 (flags & ISLASTCN)) { 1281 /* 1282 * XXX: UFS does a full VOP_ACCESS(dvp, 1283 * VWRITE) here instead of just checking 1284 * MNT_RDONLY. 1285 */ 1286 if (mp->mnt_flag & MNT_RDONLY) 1287 return (EROFS); 1288 cnp->cn_flags |= SAVENAME; 1289 return (EJUSTRETURN); 1290 } 1291 1292 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) { 1293 /* 1294 * Cache the modification time of the parent 1295 * directory from the post-op attributes in 1296 * the name cache entry. The negative cache 1297 * entry will be ignored once the directory 1298 * has changed. Don't bother adding the entry 1299 * if the directory has already changed. 1300 */ 1301 NFSLOCKNODE(np); 1302 if (timespeccmp(&np->n_vattr.na_mtime, 1303 &dnfsva.na_mtime, ==)) { 1304 NFSUNLOCKNODE(np); 1305 cache_enter_time(dvp, NULL, cnp, 1306 &dnfsva.na_mtime, NULL); 1307 } else 1308 NFSUNLOCKNODE(np); 1309 } 1310 return (ENOENT); 1311 } 1312 1313 /* 1314 * Handle RENAME case... 1315 */ 1316 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 1317 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1318 free(nfhp, M_NFSFH); 1319 return (EISDIR); 1320 } 1321 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1322 LK_EXCLUSIVE); 1323 if (error) 1324 return (error); 1325 newvp = NFSTOV(np); 1326 if (attrflag) 1327 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1328 0, 1); 1329 *vpp = newvp; 1330 cnp->cn_flags |= SAVENAME; 1331 return (0); 1332 } 1333 1334 if (flags & ISDOTDOT) { 1335 ltype = NFSVOPISLOCKED(dvp); 1336 error = vfs_busy(mp, MBF_NOWAIT); 1337 if (error != 0) { 1338 vfs_ref(mp); 1339 NFSVOPUNLOCK(dvp, 0); 1340 error = vfs_busy(mp, 0); 1341 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1342 vfs_rel(mp); 1343 if (error == 0 && VN_IS_DOOMED(dvp)) { 1344 vfs_unbusy(mp); 1345 error = ENOENT; 1346 } 1347 if (error != 0) 1348 return (error); 1349 } 1350 NFSVOPUNLOCK(dvp, 0); 1351 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1352 cnp->cn_lkflags); 1353 if (error == 0) 1354 newvp = NFSTOV(np); 1355 vfs_unbusy(mp); 1356 if (newvp != dvp) 1357 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1358 if (VN_IS_DOOMED(dvp)) { 1359 if (error == 0) { 1360 if (newvp == dvp) 1361 vrele(newvp); 1362 else 1363 vput(newvp); 1364 } 1365 error = ENOENT; 1366 } 1367 if (error != 0) 1368 return (error); 1369 if (attrflag) 1370 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1371 0, 1); 1372 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1373 free(nfhp, M_NFSFH); 1374 VREF(dvp); 1375 newvp = dvp; 1376 if (attrflag) 1377 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1378 0, 1); 1379 } else { 1380 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1381 cnp->cn_lkflags); 1382 if (error) 1383 return (error); 1384 newvp = NFSTOV(np); 1385 if (attrflag) 1386 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1387 0, 1); 1388 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1389 !(np->n_flag & NMODIFIED)) { 1390 /* 1391 * Flush the attribute cache when opening a 1392 * leaf node to ensure that fresh attributes 1393 * are fetched in nfs_open() since we did not 1394 * fetch attributes from the LOOKUP reply. 1395 */ 1396 NFSLOCKNODE(np); 1397 np->n_attrstamp = 0; 1398 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1399 NFSUNLOCKNODE(np); 1400 } 1401 } 1402 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1403 cnp->cn_flags |= SAVENAME; 1404 if ((cnp->cn_flags & MAKEENTRY) && 1405 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) && 1406 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0)) 1407 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 1408 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime); 1409 *vpp = newvp; 1410 return (0); 1411 } 1412 1413 /* 1414 * nfs read call. 1415 * Just call ncl_bioread() to do the work. 1416 */ 1417 static int 1418 nfs_read(struct vop_read_args *ap) 1419 { 1420 struct vnode *vp = ap->a_vp; 1421 1422 switch (vp->v_type) { 1423 case VREG: 1424 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1425 case VDIR: 1426 return (EISDIR); 1427 default: 1428 return (EOPNOTSUPP); 1429 } 1430 } 1431 1432 /* 1433 * nfs readlink call 1434 */ 1435 static int 1436 nfs_readlink(struct vop_readlink_args *ap) 1437 { 1438 struct vnode *vp = ap->a_vp; 1439 1440 if (vp->v_type != VLNK) 1441 return (EINVAL); 1442 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1443 } 1444 1445 /* 1446 * Do a readlink rpc. 1447 * Called by ncl_doio() from below the buffer cache. 1448 */ 1449 int 1450 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1451 { 1452 int error, ret, attrflag; 1453 struct nfsvattr nfsva; 1454 1455 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva, 1456 &attrflag, NULL); 1457 if (attrflag) { 1458 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1459 if (ret && !error) 1460 error = ret; 1461 } 1462 if (error && NFS_ISV4(vp)) 1463 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1464 return (error); 1465 } 1466 1467 /* 1468 * nfs read rpc call 1469 * Ditto above 1470 */ 1471 int 1472 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1473 { 1474 int error, ret, attrflag; 1475 struct nfsvattr nfsva; 1476 struct nfsmount *nmp; 1477 1478 nmp = VFSTONFS(vnode_mount(vp)); 1479 error = EIO; 1480 attrflag = 0; 1481 if (NFSHASPNFS(nmp)) 1482 error = nfscl_doiods(vp, uiop, NULL, NULL, 1483 NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td); 1484 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error); 1485 if (error != 0) 1486 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, 1487 &attrflag, NULL); 1488 if (attrflag) { 1489 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1490 if (ret && !error) 1491 error = ret; 1492 } 1493 if (error && NFS_ISV4(vp)) 1494 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1495 return (error); 1496 } 1497 1498 /* 1499 * nfs write call 1500 */ 1501 int 1502 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1503 int *iomode, int *must_commit, int called_from_strategy) 1504 { 1505 struct nfsvattr nfsva; 1506 int error, attrflag, ret; 1507 struct nfsmount *nmp; 1508 1509 nmp = VFSTONFS(vnode_mount(vp)); 1510 error = EIO; 1511 attrflag = 0; 1512 if (NFSHASPNFS(nmp)) 1513 error = nfscl_doiods(vp, uiop, iomode, must_commit, 1514 NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td); 1515 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error); 1516 if (error != 0) 1517 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred, 1518 uiop->uio_td, &nfsva, &attrflag, NULL, 1519 called_from_strategy); 1520 if (attrflag) { 1521 if (VTONFS(vp)->n_flag & ND_NFSV4) 1522 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1, 1523 1); 1524 else 1525 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1526 1); 1527 if (ret && !error) 1528 error = ret; 1529 } 1530 if (DOINGASYNC(vp)) 1531 *iomode = NFSWRITE_FILESYNC; 1532 if (error && NFS_ISV4(vp)) 1533 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1534 return (error); 1535 } 1536 1537 /* 1538 * nfs mknod rpc 1539 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1540 * mode set to specify the file type and the size field for rdev. 1541 */ 1542 static int 1543 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1544 struct vattr *vap) 1545 { 1546 struct nfsvattr nfsva, dnfsva; 1547 struct vnode *newvp = NULL; 1548 struct nfsnode *np = NULL, *dnp; 1549 struct nfsfh *nfhp; 1550 struct vattr vattr; 1551 int error = 0, attrflag, dattrflag; 1552 u_int32_t rdev; 1553 1554 if (vap->va_type == VCHR || vap->va_type == VBLK) 1555 rdev = vap->va_rdev; 1556 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1557 rdev = 0xffffffff; 1558 else 1559 return (EOPNOTSUPP); 1560 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1561 return (error); 1562 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap, 1563 rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva, 1564 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 1565 if (!error) { 1566 if (!nfhp) 1567 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1568 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, 1569 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1570 NULL); 1571 if (nfhp) 1572 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1573 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE); 1574 } 1575 if (dattrflag) 1576 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1577 if (!error) { 1578 newvp = NFSTOV(np); 1579 if (attrflag != 0) { 1580 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1581 0, 1); 1582 if (error != 0) 1583 vput(newvp); 1584 } 1585 } 1586 if (!error) { 1587 *vpp = newvp; 1588 } else if (NFS_ISV4(dvp)) { 1589 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid, 1590 vap->va_gid); 1591 } 1592 dnp = VTONFS(dvp); 1593 NFSLOCKNODE(dnp); 1594 dnp->n_flag |= NMODIFIED; 1595 if (!dattrflag) { 1596 dnp->n_attrstamp = 0; 1597 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1598 } 1599 NFSUNLOCKNODE(dnp); 1600 return (error); 1601 } 1602 1603 /* 1604 * nfs mknod vop 1605 * just call nfs_mknodrpc() to do the work. 1606 */ 1607 /* ARGSUSED */ 1608 static int 1609 nfs_mknod(struct vop_mknod_args *ap) 1610 { 1611 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1612 } 1613 1614 static struct mtx nfs_cverf_mtx; 1615 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex", 1616 MTX_DEF); 1617 1618 static nfsquad_t 1619 nfs_get_cverf(void) 1620 { 1621 static nfsquad_t cverf; 1622 nfsquad_t ret; 1623 static int cverf_initialized = 0; 1624 1625 mtx_lock(&nfs_cverf_mtx); 1626 if (cverf_initialized == 0) { 1627 cverf.lval[0] = arc4random(); 1628 cverf.lval[1] = arc4random(); 1629 cverf_initialized = 1; 1630 } else 1631 cverf.qval++; 1632 ret = cverf; 1633 mtx_unlock(&nfs_cverf_mtx); 1634 1635 return (ret); 1636 } 1637 1638 /* 1639 * nfs file create call 1640 */ 1641 static int 1642 nfs_create(struct vop_create_args *ap) 1643 { 1644 struct vnode *dvp = ap->a_dvp; 1645 struct vattr *vap = ap->a_vap; 1646 struct componentname *cnp = ap->a_cnp; 1647 struct nfsnode *np = NULL, *dnp; 1648 struct vnode *newvp = NULL; 1649 struct nfsmount *nmp; 1650 struct nfsvattr dnfsva, nfsva; 1651 struct nfsfh *nfhp; 1652 nfsquad_t cverf; 1653 int error = 0, attrflag, dattrflag, fmode = 0; 1654 struct vattr vattr; 1655 1656 /* 1657 * Oops, not for me.. 1658 */ 1659 if (vap->va_type == VSOCK) 1660 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1661 1662 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1663 return (error); 1664 if (vap->va_vaflags & VA_EXCLUSIVE) 1665 fmode |= O_EXCL; 1666 dnp = VTONFS(dvp); 1667 nmp = VFSTONFS(vnode_mount(dvp)); 1668 again: 1669 /* For NFSv4, wait until any remove is done. */ 1670 NFSLOCKNODE(dnp); 1671 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) { 1672 dnp->n_flag |= NREMOVEWANT; 1673 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0); 1674 } 1675 NFSUNLOCKNODE(dnp); 1676 1677 cverf = nfs_get_cverf(); 1678 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1679 vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, 1680 &nfhp, &attrflag, &dattrflag, NULL); 1681 if (!error) { 1682 if (nfhp == NULL) 1683 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1684 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, 1685 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1686 NULL); 1687 if (nfhp != NULL) 1688 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1689 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE); 1690 } 1691 if (dattrflag) 1692 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1693 if (!error) { 1694 newvp = NFSTOV(np); 1695 if (attrflag == 0) 1696 error = nfsrpc_getattr(newvp, cnp->cn_cred, 1697 cnp->cn_thread, &nfsva, NULL); 1698 if (error == 0) 1699 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1700 0, 1); 1701 } 1702 if (error) { 1703 if (newvp != NULL) { 1704 vput(newvp); 1705 newvp = NULL; 1706 } 1707 if (NFS_ISV34(dvp) && (fmode & O_EXCL) && 1708 error == NFSERR_NOTSUPP) { 1709 fmode &= ~O_EXCL; 1710 goto again; 1711 } 1712 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) { 1713 if (nfscl_checksattr(vap, &nfsva)) { 1714 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred, 1715 cnp->cn_thread, &nfsva, &attrflag, NULL); 1716 if (error && (vap->va_uid != (uid_t)VNOVAL || 1717 vap->va_gid != (gid_t)VNOVAL)) { 1718 /* try again without setting uid/gid */ 1719 vap->va_uid = (uid_t)VNOVAL; 1720 vap->va_gid = (uid_t)VNOVAL; 1721 error = nfsrpc_setattr(newvp, vap, NULL, 1722 cnp->cn_cred, cnp->cn_thread, &nfsva, 1723 &attrflag, NULL); 1724 } 1725 if (attrflag) 1726 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 1727 NULL, 0, 1); 1728 if (error != 0) 1729 vput(newvp); 1730 } 1731 } 1732 if (!error) { 1733 if ((cnp->cn_flags & MAKEENTRY) && attrflag) 1734 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 1735 NULL); 1736 *ap->a_vpp = newvp; 1737 } else if (NFS_ISV4(dvp)) { 1738 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid, 1739 vap->va_gid); 1740 } 1741 NFSLOCKNODE(dnp); 1742 dnp->n_flag |= NMODIFIED; 1743 if (!dattrflag) { 1744 dnp->n_attrstamp = 0; 1745 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1746 } 1747 NFSUNLOCKNODE(dnp); 1748 return (error); 1749 } 1750 1751 /* 1752 * nfs file remove call 1753 * To try and make nfs semantics closer to ufs semantics, a file that has 1754 * other processes using the vnode is renamed instead of removed and then 1755 * removed later on the last close. 1756 * - If v_usecount > 1 1757 * If a rename is not already in the works 1758 * call nfs_sillyrename() to set it up 1759 * else 1760 * do the remove rpc 1761 */ 1762 static int 1763 nfs_remove(struct vop_remove_args *ap) 1764 { 1765 struct vnode *vp = ap->a_vp; 1766 struct vnode *dvp = ap->a_dvp; 1767 struct componentname *cnp = ap->a_cnp; 1768 struct nfsnode *np = VTONFS(vp); 1769 int error = 0; 1770 struct vattr vattr; 1771 1772 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name")); 1773 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount")); 1774 if (vp->v_type == VDIR) 1775 error = EPERM; 1776 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1777 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1778 vattr.va_nlink > 1)) { 1779 /* 1780 * Purge the name cache so that the chance of a lookup for 1781 * the name succeeding while the remove is in progress is 1782 * minimized. Without node locking it can still happen, such 1783 * that an I/O op returns ESTALE, but since you get this if 1784 * another host removes the file.. 1785 */ 1786 cache_purge(vp); 1787 /* 1788 * throw away biocache buffers, mainly to avoid 1789 * unnecessary delayed writes later. 1790 */ 1791 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1); 1792 if (error != EINTR && error != EIO) 1793 /* Do the rpc */ 1794 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr, 1795 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1796 /* 1797 * Kludge City: If the first reply to the remove rpc is lost.. 1798 * the reply to the retransmitted request will be ENOENT 1799 * since the file was in fact removed 1800 * Therefore, we cheat and return success. 1801 */ 1802 if (error == ENOENT) 1803 error = 0; 1804 } else if (!np->n_sillyrename) 1805 error = nfs_sillyrename(dvp, vp, cnp); 1806 NFSLOCKNODE(np); 1807 np->n_attrstamp = 0; 1808 NFSUNLOCKNODE(np); 1809 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1810 return (error); 1811 } 1812 1813 /* 1814 * nfs file remove rpc called from nfs_inactive 1815 */ 1816 int 1817 ncl_removeit(struct sillyrename *sp, struct vnode *vp) 1818 { 1819 /* 1820 * Make sure that the directory vnode is still valid. 1821 * XXX we should lock sp->s_dvp here. 1822 */ 1823 if (sp->s_dvp->v_type == VBAD) 1824 return (0); 1825 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen, 1826 sp->s_cred, NULL)); 1827 } 1828 1829 /* 1830 * Nfs remove rpc, called from nfs_remove() and ncl_removeit(). 1831 */ 1832 static int 1833 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 1834 int namelen, struct ucred *cred, struct thread *td) 1835 { 1836 struct nfsvattr dnfsva; 1837 struct nfsnode *dnp = VTONFS(dvp); 1838 int error = 0, dattrflag; 1839 1840 NFSLOCKNODE(dnp); 1841 dnp->n_flag |= NREMOVEINPROG; 1842 NFSUNLOCKNODE(dnp); 1843 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva, 1844 &dattrflag, NULL); 1845 NFSLOCKNODE(dnp); 1846 if ((dnp->n_flag & NREMOVEWANT)) { 1847 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG); 1848 NFSUNLOCKNODE(dnp); 1849 wakeup((caddr_t)dnp); 1850 } else { 1851 dnp->n_flag &= ~NREMOVEINPROG; 1852 NFSUNLOCKNODE(dnp); 1853 } 1854 if (dattrflag) 1855 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1856 NFSLOCKNODE(dnp); 1857 dnp->n_flag |= NMODIFIED; 1858 if (!dattrflag) { 1859 dnp->n_attrstamp = 0; 1860 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1861 } 1862 NFSUNLOCKNODE(dnp); 1863 if (error && NFS_ISV4(dvp)) 1864 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1865 return (error); 1866 } 1867 1868 /* 1869 * nfs file rename call 1870 */ 1871 static int 1872 nfs_rename(struct vop_rename_args *ap) 1873 { 1874 struct vnode *fvp = ap->a_fvp; 1875 struct vnode *tvp = ap->a_tvp; 1876 struct vnode *fdvp = ap->a_fdvp; 1877 struct vnode *tdvp = ap->a_tdvp; 1878 struct componentname *tcnp = ap->a_tcnp; 1879 struct componentname *fcnp = ap->a_fcnp; 1880 struct nfsnode *fnp = VTONFS(ap->a_fvp); 1881 struct nfsnode *tdnp = VTONFS(ap->a_tdvp); 1882 struct nfsv4node *newv4 = NULL; 1883 int error; 1884 1885 KASSERT((tcnp->cn_flags & HASBUF) != 0 && 1886 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name")); 1887 /* Check for cross-device rename */ 1888 if ((fvp->v_mount != tdvp->v_mount) || 1889 (tvp && (fvp->v_mount != tvp->v_mount))) { 1890 error = EXDEV; 1891 goto out; 1892 } 1893 1894 if (fvp == tvp) { 1895 printf("nfs_rename: fvp == tvp (can't happen)\n"); 1896 error = 0; 1897 goto out; 1898 } 1899 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0) 1900 goto out; 1901 1902 /* 1903 * We have to flush B_DELWRI data prior to renaming 1904 * the file. If we don't, the delayed-write buffers 1905 * can be flushed out later after the file has gone stale 1906 * under NFSV3. NFSV2 does not have this problem because 1907 * ( as far as I can tell ) it flushes dirty buffers more 1908 * often. 1909 * 1910 * Skip the rename operation if the fsync fails, this can happen 1911 * due to the server's volume being full, when we pushed out data 1912 * that was written back to our cache earlier. Not checking for 1913 * this condition can result in potential (silent) data loss. 1914 */ 1915 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread); 1916 NFSVOPUNLOCK(fvp, 0); 1917 if (!error && tvp) 1918 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread); 1919 if (error) 1920 goto out; 1921 1922 /* 1923 * If the tvp exists and is in use, sillyrename it before doing the 1924 * rename of the new file over it. 1925 * XXX Can't sillyrename a directory. 1926 */ 1927 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1928 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1929 vput(tvp); 1930 tvp = NULL; 1931 } 1932 1933 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1934 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1935 tcnp->cn_thread); 1936 1937 if (error == 0 && NFS_ISV4(tdvp)) { 1938 /* 1939 * For NFSv4, check to see if it is the same name and 1940 * replace the name, if it is different. 1941 */ 1942 newv4 = malloc( 1943 sizeof (struct nfsv4node) + 1944 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1, 1945 M_NFSV4NODE, M_WAITOK); 1946 NFSLOCKNODE(tdnp); 1947 NFSLOCKNODE(fnp); 1948 if (fnp->n_v4 != NULL && fvp->v_type == VREG && 1949 (fnp->n_v4->n4_namelen != tcnp->cn_namelen || 1950 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4), 1951 tcnp->cn_namelen) || 1952 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen || 1953 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 1954 tdnp->n_fhp->nfh_len))) { 1955 #ifdef notdef 1956 { char nnn[100]; int nnnl; 1957 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99; 1958 bcopy(tcnp->cn_nameptr, nnn, nnnl); 1959 nnn[nnnl] = '\0'; 1960 printf("ren replace=%s\n",nnn); 1961 } 1962 #endif 1963 free(fnp->n_v4, M_NFSV4NODE); 1964 fnp->n_v4 = newv4; 1965 newv4 = NULL; 1966 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len; 1967 fnp->n_v4->n4_namelen = tcnp->cn_namelen; 1968 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 1969 tdnp->n_fhp->nfh_len); 1970 NFSBCOPY(tcnp->cn_nameptr, 1971 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen); 1972 } 1973 NFSUNLOCKNODE(tdnp); 1974 NFSUNLOCKNODE(fnp); 1975 if (newv4 != NULL) 1976 free(newv4, M_NFSV4NODE); 1977 } 1978 1979 if (fvp->v_type == VDIR) { 1980 if (tvp != NULL && tvp->v_type == VDIR) 1981 cache_purge(tdvp); 1982 cache_purge(fdvp); 1983 } 1984 1985 out: 1986 if (tdvp == tvp) 1987 vrele(tdvp); 1988 else 1989 vput(tdvp); 1990 if (tvp) 1991 vput(tvp); 1992 vrele(fdvp); 1993 vrele(fvp); 1994 /* 1995 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1996 */ 1997 if (error == ENOENT) 1998 error = 0; 1999 return (error); 2000 } 2001 2002 /* 2003 * nfs file rename rpc called from nfs_remove() above 2004 */ 2005 static int 2006 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp, 2007 struct sillyrename *sp) 2008 { 2009 2010 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen, 2011 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred, 2012 scnp->cn_thread)); 2013 } 2014 2015 /* 2016 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 2017 */ 2018 static int 2019 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr, 2020 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr, 2021 int tnamelen, struct ucred *cred, struct thread *td) 2022 { 2023 struct nfsvattr fnfsva, tnfsva; 2024 struct nfsnode *fdnp = VTONFS(fdvp); 2025 struct nfsnode *tdnp = VTONFS(tdvp); 2026 int error = 0, fattrflag, tattrflag; 2027 2028 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp, 2029 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag, 2030 &tattrflag, NULL, NULL); 2031 NFSLOCKNODE(fdnp); 2032 fdnp->n_flag |= NMODIFIED; 2033 if (fattrflag != 0) { 2034 NFSUNLOCKNODE(fdnp); 2035 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1); 2036 } else { 2037 fdnp->n_attrstamp = 0; 2038 NFSUNLOCKNODE(fdnp); 2039 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 2040 } 2041 NFSLOCKNODE(tdnp); 2042 tdnp->n_flag |= NMODIFIED; 2043 if (tattrflag != 0) { 2044 NFSUNLOCKNODE(tdnp); 2045 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1); 2046 } else { 2047 tdnp->n_attrstamp = 0; 2048 NFSUNLOCKNODE(tdnp); 2049 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2050 } 2051 if (error && NFS_ISV4(fdvp)) 2052 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2053 return (error); 2054 } 2055 2056 /* 2057 * nfs hard link create call 2058 */ 2059 static int 2060 nfs_link(struct vop_link_args *ap) 2061 { 2062 struct vnode *vp = ap->a_vp; 2063 struct vnode *tdvp = ap->a_tdvp; 2064 struct componentname *cnp = ap->a_cnp; 2065 struct nfsnode *np, *tdnp; 2066 struct nfsvattr nfsva, dnfsva; 2067 int error = 0, attrflag, dattrflag; 2068 2069 /* 2070 * Push all writes to the server, so that the attribute cache 2071 * doesn't get "out of sync" with the server. 2072 * XXX There should be a better way! 2073 */ 2074 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread); 2075 2076 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 2077 cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag, 2078 &dattrflag, NULL); 2079 tdnp = VTONFS(tdvp); 2080 NFSLOCKNODE(tdnp); 2081 tdnp->n_flag |= NMODIFIED; 2082 if (dattrflag != 0) { 2083 NFSUNLOCKNODE(tdnp); 2084 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1); 2085 } else { 2086 tdnp->n_attrstamp = 0; 2087 NFSUNLOCKNODE(tdnp); 2088 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2089 } 2090 if (attrflag) 2091 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2092 else { 2093 np = VTONFS(vp); 2094 NFSLOCKNODE(np); 2095 np->n_attrstamp = 0; 2096 NFSUNLOCKNODE(np); 2097 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 2098 } 2099 /* 2100 * If negative lookup caching is enabled, I might as well 2101 * add an entry for this node. Not necessary for correctness, 2102 * but if negative caching is enabled, then the system 2103 * must care about lookup caching hit rate, so... 2104 */ 2105 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 && 2106 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2107 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL); 2108 } 2109 if (error && NFS_ISV4(vp)) 2110 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0, 2111 (gid_t)0); 2112 return (error); 2113 } 2114 2115 /* 2116 * nfs symbolic link create call 2117 */ 2118 static int 2119 nfs_symlink(struct vop_symlink_args *ap) 2120 { 2121 struct vnode *dvp = ap->a_dvp; 2122 struct vattr *vap = ap->a_vap; 2123 struct componentname *cnp = ap->a_cnp; 2124 struct nfsvattr nfsva, dnfsva; 2125 struct nfsfh *nfhp; 2126 struct nfsnode *np = NULL, *dnp; 2127 struct vnode *newvp = NULL; 2128 int error = 0, attrflag, dattrflag, ret; 2129 2130 vap->va_type = VLNK; 2131 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2132 ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, 2133 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 2134 if (nfhp) { 2135 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread, 2136 &np, NULL, LK_EXCLUSIVE); 2137 if (!ret) 2138 newvp = NFSTOV(np); 2139 else if (!error) 2140 error = ret; 2141 } 2142 if (newvp != NULL) { 2143 if (attrflag) 2144 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2145 0, 1); 2146 } else if (!error) { 2147 /* 2148 * If we do not have an error and we could not extract the 2149 * newvp from the response due to the request being NFSv2, we 2150 * have to do a lookup in order to obtain a newvp to return. 2151 */ 2152 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2153 cnp->cn_cred, cnp->cn_thread, &np); 2154 if (!error) 2155 newvp = NFSTOV(np); 2156 } 2157 if (error) { 2158 if (newvp) 2159 vput(newvp); 2160 if (NFS_ISV4(dvp)) 2161 error = nfscl_maperr(cnp->cn_thread, error, 2162 vap->va_uid, vap->va_gid); 2163 } else { 2164 *ap->a_vpp = newvp; 2165 } 2166 2167 dnp = VTONFS(dvp); 2168 NFSLOCKNODE(dnp); 2169 dnp->n_flag |= NMODIFIED; 2170 if (dattrflag != 0) { 2171 NFSUNLOCKNODE(dnp); 2172 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2173 } else { 2174 dnp->n_attrstamp = 0; 2175 NFSUNLOCKNODE(dnp); 2176 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2177 } 2178 /* 2179 * If negative lookup caching is enabled, I might as well 2180 * add an entry for this node. Not necessary for correctness, 2181 * but if negative caching is enabled, then the system 2182 * must care about lookup caching hit rate, so... 2183 */ 2184 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2185 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2186 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL); 2187 } 2188 return (error); 2189 } 2190 2191 /* 2192 * nfs make dir call 2193 */ 2194 static int 2195 nfs_mkdir(struct vop_mkdir_args *ap) 2196 { 2197 struct vnode *dvp = ap->a_dvp; 2198 struct vattr *vap = ap->a_vap; 2199 struct componentname *cnp = ap->a_cnp; 2200 struct nfsnode *np = NULL, *dnp; 2201 struct vnode *newvp = NULL; 2202 struct vattr vattr; 2203 struct nfsfh *nfhp; 2204 struct nfsvattr nfsva, dnfsva; 2205 int error = 0, attrflag, dattrflag, ret; 2206 2207 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2208 return (error); 2209 vap->va_type = VDIR; 2210 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2211 vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp, 2212 &attrflag, &dattrflag, NULL); 2213 dnp = VTONFS(dvp); 2214 NFSLOCKNODE(dnp); 2215 dnp->n_flag |= NMODIFIED; 2216 if (dattrflag != 0) { 2217 NFSUNLOCKNODE(dnp); 2218 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2219 } else { 2220 dnp->n_attrstamp = 0; 2221 NFSUNLOCKNODE(dnp); 2222 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2223 } 2224 if (nfhp) { 2225 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread, 2226 &np, NULL, LK_EXCLUSIVE); 2227 if (!ret) { 2228 newvp = NFSTOV(np); 2229 if (attrflag) 2230 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 2231 NULL, 0, 1); 2232 } else if (!error) 2233 error = ret; 2234 } 2235 if (!error && newvp == NULL) { 2236 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2237 cnp->cn_cred, cnp->cn_thread, &np); 2238 if (!error) { 2239 newvp = NFSTOV(np); 2240 if (newvp->v_type != VDIR) 2241 error = EEXIST; 2242 } 2243 } 2244 if (error) { 2245 if (newvp) 2246 vput(newvp); 2247 if (NFS_ISV4(dvp)) 2248 error = nfscl_maperr(cnp->cn_thread, error, 2249 vap->va_uid, vap->va_gid); 2250 } else { 2251 /* 2252 * If negative lookup caching is enabled, I might as well 2253 * add an entry for this node. Not necessary for correctness, 2254 * but if negative caching is enabled, then the system 2255 * must care about lookup caching hit rate, so... 2256 */ 2257 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2258 (cnp->cn_flags & MAKEENTRY) && 2259 attrflag != 0 && dattrflag != 0) 2260 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 2261 &dnfsva.na_ctime); 2262 *ap->a_vpp = newvp; 2263 } 2264 return (error); 2265 } 2266 2267 /* 2268 * nfs remove directory call 2269 */ 2270 static int 2271 nfs_rmdir(struct vop_rmdir_args *ap) 2272 { 2273 struct vnode *vp = ap->a_vp; 2274 struct vnode *dvp = ap->a_dvp; 2275 struct componentname *cnp = ap->a_cnp; 2276 struct nfsnode *dnp; 2277 struct nfsvattr dnfsva; 2278 int error, dattrflag; 2279 2280 if (dvp == vp) 2281 return (EINVAL); 2282 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2283 cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL); 2284 dnp = VTONFS(dvp); 2285 NFSLOCKNODE(dnp); 2286 dnp->n_flag |= NMODIFIED; 2287 if (dattrflag != 0) { 2288 NFSUNLOCKNODE(dnp); 2289 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2290 } else { 2291 dnp->n_attrstamp = 0; 2292 NFSUNLOCKNODE(dnp); 2293 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2294 } 2295 2296 cache_purge(dvp); 2297 cache_purge(vp); 2298 if (error && NFS_ISV4(dvp)) 2299 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0, 2300 (gid_t)0); 2301 /* 2302 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2303 */ 2304 if (error == ENOENT) 2305 error = 0; 2306 return (error); 2307 } 2308 2309 /* 2310 * nfs readdir call 2311 */ 2312 static int 2313 nfs_readdir(struct vop_readdir_args *ap) 2314 { 2315 struct vnode *vp = ap->a_vp; 2316 struct nfsnode *np = VTONFS(vp); 2317 struct uio *uio = ap->a_uio; 2318 ssize_t tresid, left; 2319 int error = 0; 2320 struct vattr vattr; 2321 2322 if (ap->a_eofflag != NULL) 2323 *ap->a_eofflag = 0; 2324 if (vp->v_type != VDIR) 2325 return(EPERM); 2326 2327 /* 2328 * First, check for hit on the EOF offset cache 2329 */ 2330 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2331 (np->n_flag & NMODIFIED) == 0) { 2332 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2333 NFSLOCKNODE(np); 2334 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) || 2335 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2336 NFSUNLOCKNODE(np); 2337 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits); 2338 if (ap->a_eofflag != NULL) 2339 *ap->a_eofflag = 1; 2340 return (0); 2341 } else 2342 NFSUNLOCKNODE(np); 2343 } 2344 } 2345 2346 /* 2347 * NFS always guarantees that directory entries don't straddle 2348 * DIRBLKSIZ boundaries. As such, we need to limit the size 2349 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial 2350 * directory entry. 2351 */ 2352 left = uio->uio_resid % DIRBLKSIZ; 2353 if (left == uio->uio_resid) 2354 return (EINVAL); 2355 uio->uio_resid -= left; 2356 2357 /* 2358 * Call ncl_bioread() to do the real work. 2359 */ 2360 tresid = uio->uio_resid; 2361 error = ncl_bioread(vp, uio, 0, ap->a_cred); 2362 2363 if (!error && uio->uio_resid == tresid) { 2364 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses); 2365 if (ap->a_eofflag != NULL) 2366 *ap->a_eofflag = 1; 2367 } 2368 2369 /* Add the partial DIRBLKSIZ (left) back in. */ 2370 uio->uio_resid += left; 2371 return (error); 2372 } 2373 2374 /* 2375 * Readdir rpc call. 2376 * Called from below the buffer cache by ncl_doio(). 2377 */ 2378 int 2379 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2380 struct thread *td) 2381 { 2382 struct nfsvattr nfsva; 2383 nfsuint64 *cookiep, cookie; 2384 struct nfsnode *dnp = VTONFS(vp); 2385 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2386 int error = 0, eof, attrflag; 2387 2388 KASSERT(uiop->uio_iovcnt == 1 && 2389 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2390 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2391 ("nfs readdirrpc bad uio")); 2392 2393 /* 2394 * If there is no cookie, assume directory was stale. 2395 */ 2396 ncl_dircookie_lock(dnp); 2397 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2398 if (cookiep) { 2399 cookie = *cookiep; 2400 ncl_dircookie_unlock(dnp); 2401 } else { 2402 ncl_dircookie_unlock(dnp); 2403 return (NFSERR_BAD_COOKIE); 2404 } 2405 2406 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2407 (void)ncl_fsinfo(nmp, vp, cred, td); 2408 2409 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva, 2410 &attrflag, &eof, NULL); 2411 if (attrflag) 2412 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2413 2414 if (!error) { 2415 /* 2416 * We are now either at the end of the directory or have filled 2417 * the block. 2418 */ 2419 if (eof) 2420 dnp->n_direofoffset = uiop->uio_offset; 2421 else { 2422 if (uiop->uio_resid > 0) 2423 printf("EEK! readdirrpc resid > 0\n"); 2424 ncl_dircookie_lock(dnp); 2425 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2426 *cookiep = cookie; 2427 ncl_dircookie_unlock(dnp); 2428 } 2429 } else if (NFS_ISV4(vp)) { 2430 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2431 } 2432 return (error); 2433 } 2434 2435 /* 2436 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc(). 2437 */ 2438 int 2439 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2440 struct thread *td) 2441 { 2442 struct nfsvattr nfsva; 2443 nfsuint64 *cookiep, cookie; 2444 struct nfsnode *dnp = VTONFS(vp); 2445 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2446 int error = 0, attrflag, eof; 2447 2448 KASSERT(uiop->uio_iovcnt == 1 && 2449 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2450 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2451 ("nfs readdirplusrpc bad uio")); 2452 2453 /* 2454 * If there is no cookie, assume directory was stale. 2455 */ 2456 ncl_dircookie_lock(dnp); 2457 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2458 if (cookiep) { 2459 cookie = *cookiep; 2460 ncl_dircookie_unlock(dnp); 2461 } else { 2462 ncl_dircookie_unlock(dnp); 2463 return (NFSERR_BAD_COOKIE); 2464 } 2465 2466 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2467 (void)ncl_fsinfo(nmp, vp, cred, td); 2468 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva, 2469 &attrflag, &eof, NULL); 2470 if (attrflag) 2471 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2472 2473 if (!error) { 2474 /* 2475 * We are now either at end of the directory or have filled the 2476 * the block. 2477 */ 2478 if (eof) 2479 dnp->n_direofoffset = uiop->uio_offset; 2480 else { 2481 if (uiop->uio_resid > 0) 2482 printf("EEK! readdirplusrpc resid > 0\n"); 2483 ncl_dircookie_lock(dnp); 2484 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2485 *cookiep = cookie; 2486 ncl_dircookie_unlock(dnp); 2487 } 2488 } else if (NFS_ISV4(vp)) { 2489 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2490 } 2491 return (error); 2492 } 2493 2494 /* 2495 * Silly rename. To make the NFS filesystem that is stateless look a little 2496 * more like the "ufs" a remove of an active vnode is translated to a rename 2497 * to a funny looking filename that is removed by nfs_inactive on the 2498 * nfsnode. There is the potential for another process on a different client 2499 * to create the same funny name between the nfs_lookitup() fails and the 2500 * nfs_rename() completes, but... 2501 */ 2502 static int 2503 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2504 { 2505 struct sillyrename *sp; 2506 struct nfsnode *np; 2507 int error; 2508 short pid; 2509 unsigned int lticks; 2510 2511 cache_purge(dvp); 2512 np = VTONFS(vp); 2513 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir")); 2514 sp = malloc(sizeof (struct sillyrename), 2515 M_NEWNFSREQ, M_WAITOK); 2516 sp->s_cred = crhold(cnp->cn_cred); 2517 sp->s_dvp = dvp; 2518 VREF(dvp); 2519 2520 /* 2521 * Fudge together a funny name. 2522 * Changing the format of the funny name to accommodate more 2523 * sillynames per directory. 2524 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2525 * CPU ticks since boot. 2526 */ 2527 pid = cnp->cn_thread->td_proc->p_pid; 2528 lticks = (unsigned int)ticks; 2529 for ( ; ; ) { 2530 sp->s_namlen = sprintf(sp->s_name, 2531 ".nfs.%08x.%04x4.4", lticks, 2532 pid); 2533 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2534 cnp->cn_thread, NULL)) 2535 break; 2536 lticks++; 2537 } 2538 error = nfs_renameit(dvp, vp, cnp, sp); 2539 if (error) 2540 goto bad; 2541 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2542 cnp->cn_thread, &np); 2543 np->n_sillyrename = sp; 2544 return (0); 2545 bad: 2546 vrele(sp->s_dvp); 2547 crfree(sp->s_cred); 2548 free(sp, M_NEWNFSREQ); 2549 return (error); 2550 } 2551 2552 /* 2553 * Look up a file name and optionally either update the file handle or 2554 * allocate an nfsnode, depending on the value of npp. 2555 * npp == NULL --> just do the lookup 2556 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2557 * handled too 2558 * *npp != NULL --> update the file handle in the vnode 2559 */ 2560 static int 2561 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred, 2562 struct thread *td, struct nfsnode **npp) 2563 { 2564 struct vnode *newvp = NULL, *vp; 2565 struct nfsnode *np, *dnp = VTONFS(dvp); 2566 struct nfsfh *nfhp, *onfhp; 2567 struct nfsvattr nfsva, dnfsva; 2568 struct componentname cn; 2569 int error = 0, attrflag, dattrflag; 2570 u_int hash; 2571 2572 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva, 2573 &nfhp, &attrflag, &dattrflag, NULL); 2574 if (dattrflag) 2575 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2576 if (npp && !error) { 2577 if (*npp != NULL) { 2578 np = *npp; 2579 vp = NFSTOV(np); 2580 /* 2581 * For NFSv4, check to see if it is the same name and 2582 * replace the name, if it is different. 2583 */ 2584 if (np->n_v4 != NULL && nfsva.na_type == VREG && 2585 (np->n_v4->n4_namelen != len || 2586 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) || 2587 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen || 2588 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2589 dnp->n_fhp->nfh_len))) { 2590 #ifdef notdef 2591 { char nnn[100]; int nnnl; 2592 nnnl = (len < 100) ? len : 99; 2593 bcopy(name, nnn, nnnl); 2594 nnn[nnnl] = '\0'; 2595 printf("replace=%s\n",nnn); 2596 } 2597 #endif 2598 free(np->n_v4, M_NFSV4NODE); 2599 np->n_v4 = malloc( 2600 sizeof (struct nfsv4node) + 2601 dnp->n_fhp->nfh_len + len - 1, 2602 M_NFSV4NODE, M_WAITOK); 2603 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len; 2604 np->n_v4->n4_namelen = len; 2605 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2606 dnp->n_fhp->nfh_len); 2607 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len); 2608 } 2609 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, 2610 FNV1_32_INIT); 2611 onfhp = np->n_fhp; 2612 /* 2613 * Rehash node for new file handle. 2614 */ 2615 vfs_hash_rehash(vp, hash); 2616 np->n_fhp = nfhp; 2617 if (onfhp != NULL) 2618 free(onfhp, M_NFSFH); 2619 newvp = NFSTOV(np); 2620 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) { 2621 free(nfhp, M_NFSFH); 2622 VREF(dvp); 2623 newvp = dvp; 2624 } else { 2625 cn.cn_nameptr = name; 2626 cn.cn_namelen = len; 2627 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td, 2628 &np, NULL, LK_EXCLUSIVE); 2629 if (error) 2630 return (error); 2631 newvp = NFSTOV(np); 2632 } 2633 if (!attrflag && *npp == NULL) { 2634 if (newvp == dvp) 2635 vrele(newvp); 2636 else 2637 vput(newvp); 2638 return (ENOENT); 2639 } 2640 if (attrflag) 2641 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2642 0, 1); 2643 } 2644 if (npp && *npp == NULL) { 2645 if (error) { 2646 if (newvp) { 2647 if (newvp == dvp) 2648 vrele(newvp); 2649 else 2650 vput(newvp); 2651 } 2652 } else 2653 *npp = np; 2654 } 2655 if (error && NFS_ISV4(dvp)) 2656 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2657 return (error); 2658 } 2659 2660 /* 2661 * Nfs Version 3 and 4 commit rpc 2662 */ 2663 int 2664 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2665 struct thread *td) 2666 { 2667 struct nfsvattr nfsva; 2668 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2669 struct nfsnode *np; 2670 struct uio uio; 2671 int error, attrflag; 2672 2673 np = VTONFS(vp); 2674 error = EIO; 2675 attrflag = 0; 2676 if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) { 2677 uio.uio_offset = offset; 2678 uio.uio_resid = cnt; 2679 error = nfscl_doiods(vp, &uio, NULL, NULL, 2680 NFSV4OPEN_ACCESSWRITE, 1, cred, td); 2681 if (error != 0) { 2682 NFSLOCKNODE(np); 2683 np->n_flag &= ~NDSCOMMIT; 2684 NFSUNLOCKNODE(np); 2685 } 2686 } 2687 if (error != 0) { 2688 mtx_lock(&nmp->nm_mtx); 2689 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2690 mtx_unlock(&nmp->nm_mtx); 2691 return (0); 2692 } 2693 mtx_unlock(&nmp->nm_mtx); 2694 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva, 2695 &attrflag, NULL); 2696 } 2697 if (attrflag != 0) 2698 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 2699 0, 1); 2700 if (error != 0 && NFS_ISV4(vp)) 2701 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2702 return (error); 2703 } 2704 2705 /* 2706 * Strategy routine. 2707 * For async requests when nfsiod(s) are running, queue the request by 2708 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the 2709 * request. 2710 */ 2711 static int 2712 nfs_strategy(struct vop_strategy_args *ap) 2713 { 2714 struct buf *bp; 2715 struct vnode *vp; 2716 struct ucred *cr; 2717 2718 bp = ap->a_bp; 2719 vp = ap->a_vp; 2720 KASSERT(bp->b_vp == vp, ("missing b_getvp")); 2721 KASSERT(!(bp->b_flags & B_DONE), 2722 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2723 2724 if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno) 2725 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize / 2726 DEV_BSIZE); 2727 if (bp->b_iocmd == BIO_READ) 2728 cr = bp->b_rcred; 2729 else 2730 cr = bp->b_wcred; 2731 2732 /* 2733 * If the op is asynchronous and an i/o daemon is waiting 2734 * queue the request, wake it up and wait for completion 2735 * otherwise just do it ourselves. 2736 */ 2737 if ((bp->b_flags & B_ASYNC) == 0 || 2738 ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread)) 2739 (void) ncl_doio(vp, bp, cr, curthread, 1); 2740 return (0); 2741 } 2742 2743 /* 2744 * fsync vnode op. Just call ncl_flush() with commit == 1. 2745 */ 2746 /* ARGSUSED */ 2747 static int 2748 nfs_fsync(struct vop_fsync_args *ap) 2749 { 2750 2751 if (ap->a_vp->v_type != VREG) { 2752 /* 2753 * For NFS, metadata is changed synchronously on the server, 2754 * so there is nothing to flush. Also, ncl_flush() clears 2755 * the NMODIFIED flag and that shouldn't be done here for 2756 * directories. 2757 */ 2758 return (0); 2759 } 2760 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0)); 2761 } 2762 2763 /* 2764 * Flush all the blocks associated with a vnode. 2765 * Walk through the buffer pool and push any dirty pages 2766 * associated with the vnode. 2767 * If the called_from_renewthread argument is TRUE, it has been called 2768 * from the NFSv4 renew thread and, as such, cannot block indefinitely 2769 * waiting for a buffer write to complete. 2770 */ 2771 int 2772 ncl_flush(struct vnode *vp, int waitfor, struct thread *td, 2773 int commit, int called_from_renewthread) 2774 { 2775 struct nfsnode *np = VTONFS(vp); 2776 struct buf *bp; 2777 int i; 2778 struct buf *nbp; 2779 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2780 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2781 int passone = 1, trycnt = 0; 2782 u_quad_t off, endoff, toff; 2783 struct ucred* wcred = NULL; 2784 struct buf **bvec = NULL; 2785 struct bufobj *bo; 2786 #ifndef NFS_COMMITBVECSIZ 2787 #define NFS_COMMITBVECSIZ 20 2788 #endif 2789 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2790 u_int bvecsize = 0, bveccount; 2791 2792 if (called_from_renewthread != 0) 2793 slptimeo = hz; 2794 if (nmp->nm_flag & NFSMNT_INT) 2795 slpflag = PCATCH; 2796 if (!commit) 2797 passone = 0; 2798 bo = &vp->v_bufobj; 2799 /* 2800 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2801 * server, but has not been committed to stable storage on the server 2802 * yet. On the first pass, the byte range is worked out and the commit 2803 * rpc is done. On the second pass, ncl_writebp() is called to do the 2804 * job. 2805 */ 2806 again: 2807 off = (u_quad_t)-1; 2808 endoff = 0; 2809 bvecpos = 0; 2810 if (NFS_ISV34(vp) && commit) { 2811 if (bvec != NULL && bvec != bvec_on_stack) 2812 free(bvec, M_TEMP); 2813 /* 2814 * Count up how many buffers waiting for a commit. 2815 */ 2816 bveccount = 0; 2817 BO_LOCK(bo); 2818 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2819 if (!BUF_ISLOCKED(bp) && 2820 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2821 == (B_DELWRI | B_NEEDCOMMIT)) 2822 bveccount++; 2823 } 2824 /* 2825 * Allocate space to remember the list of bufs to commit. It is 2826 * important to use M_NOWAIT here to avoid a race with nfs_write. 2827 * If we can't get memory (for whatever reason), we will end up 2828 * committing the buffers one-by-one in the loop below. 2829 */ 2830 if (bveccount > NFS_COMMITBVECSIZ) { 2831 /* 2832 * Release the vnode interlock to avoid a lock 2833 * order reversal. 2834 */ 2835 BO_UNLOCK(bo); 2836 bvec = (struct buf **) 2837 malloc(bveccount * sizeof(struct buf *), 2838 M_TEMP, M_NOWAIT); 2839 BO_LOCK(bo); 2840 if (bvec == NULL) { 2841 bvec = bvec_on_stack; 2842 bvecsize = NFS_COMMITBVECSIZ; 2843 } else 2844 bvecsize = bveccount; 2845 } else { 2846 bvec = bvec_on_stack; 2847 bvecsize = NFS_COMMITBVECSIZ; 2848 } 2849 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2850 if (bvecpos >= bvecsize) 2851 break; 2852 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2853 nbp = TAILQ_NEXT(bp, b_bobufs); 2854 continue; 2855 } 2856 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2857 (B_DELWRI | B_NEEDCOMMIT)) { 2858 BUF_UNLOCK(bp); 2859 nbp = TAILQ_NEXT(bp, b_bobufs); 2860 continue; 2861 } 2862 BO_UNLOCK(bo); 2863 bremfree(bp); 2864 /* 2865 * Work out if all buffers are using the same cred 2866 * so we can deal with them all with one commit. 2867 * 2868 * NOTE: we are not clearing B_DONE here, so we have 2869 * to do it later on in this routine if we intend to 2870 * initiate I/O on the bp. 2871 * 2872 * Note: to avoid loopback deadlocks, we do not 2873 * assign b_runningbufspace. 2874 */ 2875 if (wcred == NULL) 2876 wcred = bp->b_wcred; 2877 else if (wcred != bp->b_wcred) 2878 wcred = NOCRED; 2879 vfs_busy_pages(bp, 1); 2880 2881 BO_LOCK(bo); 2882 /* 2883 * bp is protected by being locked, but nbp is not 2884 * and vfs_busy_pages() may sleep. We have to 2885 * recalculate nbp. 2886 */ 2887 nbp = TAILQ_NEXT(bp, b_bobufs); 2888 2889 /* 2890 * A list of these buffers is kept so that the 2891 * second loop knows which buffers have actually 2892 * been committed. This is necessary, since there 2893 * may be a race between the commit rpc and new 2894 * uncommitted writes on the file. 2895 */ 2896 bvec[bvecpos++] = bp; 2897 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2898 bp->b_dirtyoff; 2899 if (toff < off) 2900 off = toff; 2901 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 2902 if (toff > endoff) 2903 endoff = toff; 2904 } 2905 BO_UNLOCK(bo); 2906 } 2907 if (bvecpos > 0) { 2908 /* 2909 * Commit data on the server, as required. 2910 * If all bufs are using the same wcred, then use that with 2911 * one call for all of them, otherwise commit each one 2912 * separately. 2913 */ 2914 if (wcred != NOCRED) 2915 retv = ncl_commit(vp, off, (int)(endoff - off), 2916 wcred, td); 2917 else { 2918 retv = 0; 2919 for (i = 0; i < bvecpos; i++) { 2920 off_t off, size; 2921 bp = bvec[i]; 2922 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2923 bp->b_dirtyoff; 2924 size = (u_quad_t)(bp->b_dirtyend 2925 - bp->b_dirtyoff); 2926 retv = ncl_commit(vp, off, (int)size, 2927 bp->b_wcred, td); 2928 if (retv) break; 2929 } 2930 } 2931 2932 if (retv == NFSERR_STALEWRITEVERF) 2933 ncl_clearcommit(vp->v_mount); 2934 2935 /* 2936 * Now, either mark the blocks I/O done or mark the 2937 * blocks dirty, depending on whether the commit 2938 * succeeded. 2939 */ 2940 for (i = 0; i < bvecpos; i++) { 2941 bp = bvec[i]; 2942 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 2943 if (retv) { 2944 /* 2945 * Error, leave B_DELWRI intact 2946 */ 2947 vfs_unbusy_pages(bp); 2948 brelse(bp); 2949 } else { 2950 /* 2951 * Success, remove B_DELWRI ( bundirty() ). 2952 * 2953 * b_dirtyoff/b_dirtyend seem to be NFS 2954 * specific. We should probably move that 2955 * into bundirty(). XXX 2956 */ 2957 bufobj_wref(bo); 2958 bp->b_flags |= B_ASYNC; 2959 bundirty(bp); 2960 bp->b_flags &= ~B_DONE; 2961 bp->b_ioflags &= ~BIO_ERROR; 2962 bp->b_dirtyoff = bp->b_dirtyend = 0; 2963 bufdone(bp); 2964 } 2965 } 2966 } 2967 2968 /* 2969 * Start/do any write(s) that are required. 2970 */ 2971 loop: 2972 BO_LOCK(bo); 2973 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2974 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2975 if (waitfor != MNT_WAIT || passone) 2976 continue; 2977 2978 error = BUF_TIMELOCK(bp, 2979 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 2980 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo); 2981 if (error == 0) { 2982 BUF_UNLOCK(bp); 2983 goto loop; 2984 } 2985 if (error == ENOLCK) { 2986 error = 0; 2987 goto loop; 2988 } 2989 if (called_from_renewthread != 0) { 2990 /* 2991 * Return EIO so the flush will be retried 2992 * later. 2993 */ 2994 error = EIO; 2995 goto done; 2996 } 2997 if (newnfs_sigintr(nmp, td)) { 2998 error = EINTR; 2999 goto done; 3000 } 3001 if (slpflag == PCATCH) { 3002 slpflag = 0; 3003 slptimeo = 2 * hz; 3004 } 3005 goto loop; 3006 } 3007 if ((bp->b_flags & B_DELWRI) == 0) 3008 panic("nfs_fsync: not dirty"); 3009 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3010 BUF_UNLOCK(bp); 3011 continue; 3012 } 3013 BO_UNLOCK(bo); 3014 bremfree(bp); 3015 bp->b_flags |= B_ASYNC; 3016 bwrite(bp); 3017 if (newnfs_sigintr(nmp, td)) { 3018 error = EINTR; 3019 goto done; 3020 } 3021 goto loop; 3022 } 3023 if (passone) { 3024 passone = 0; 3025 BO_UNLOCK(bo); 3026 goto again; 3027 } 3028 if (waitfor == MNT_WAIT) { 3029 while (bo->bo_numoutput) { 3030 error = bufobj_wwait(bo, slpflag, slptimeo); 3031 if (error) { 3032 BO_UNLOCK(bo); 3033 if (called_from_renewthread != 0) { 3034 /* 3035 * Return EIO so that the flush will be 3036 * retried later. 3037 */ 3038 error = EIO; 3039 goto done; 3040 } 3041 error = newnfs_sigintr(nmp, td); 3042 if (error) 3043 goto done; 3044 if (slpflag == PCATCH) { 3045 slpflag = 0; 3046 slptimeo = 2 * hz; 3047 } 3048 BO_LOCK(bo); 3049 } 3050 } 3051 if (bo->bo_dirty.bv_cnt != 0 && commit) { 3052 BO_UNLOCK(bo); 3053 goto loop; 3054 } 3055 /* 3056 * Wait for all the async IO requests to drain 3057 */ 3058 BO_UNLOCK(bo); 3059 NFSLOCKNODE(np); 3060 while (np->n_directio_asyncwr > 0) { 3061 np->n_flag |= NFSYNCWAIT; 3062 error = newnfs_msleep(td, &np->n_directio_asyncwr, 3063 &np->n_mtx, slpflag | (PRIBIO + 1), 3064 "nfsfsync", 0); 3065 if (error) { 3066 if (newnfs_sigintr(nmp, td)) { 3067 NFSUNLOCKNODE(np); 3068 error = EINTR; 3069 goto done; 3070 } 3071 } 3072 } 3073 NFSUNLOCKNODE(np); 3074 } else 3075 BO_UNLOCK(bo); 3076 if (NFSHASPNFS(nmp)) { 3077 nfscl_layoutcommit(vp, td); 3078 /* 3079 * Invalidate the attribute cache, since writes to a DS 3080 * won't update the size attribute. 3081 */ 3082 NFSLOCKNODE(np); 3083 np->n_attrstamp = 0; 3084 } else 3085 NFSLOCKNODE(np); 3086 if (np->n_flag & NWRITEERR) { 3087 error = np->n_error; 3088 np->n_flag &= ~NWRITEERR; 3089 } 3090 if (commit && bo->bo_dirty.bv_cnt == 0 && 3091 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) 3092 np->n_flag &= ~NMODIFIED; 3093 NFSUNLOCKNODE(np); 3094 done: 3095 if (bvec != NULL && bvec != bvec_on_stack) 3096 free(bvec, M_TEMP); 3097 if (error == 0 && commit != 0 && waitfor == MNT_WAIT && 3098 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 || 3099 np->n_directio_asyncwr != 0)) { 3100 if (trycnt++ < 5) { 3101 /* try, try again... */ 3102 passone = 1; 3103 wcred = NULL; 3104 bvec = NULL; 3105 bvecsize = 0; 3106 goto again; 3107 } 3108 vn_printf(vp, "ncl_flush failed"); 3109 error = called_from_renewthread != 0 ? EIO : EBUSY; 3110 } 3111 return (error); 3112 } 3113 3114 /* 3115 * NFS advisory byte-level locks. 3116 */ 3117 static int 3118 nfs_advlock(struct vop_advlock_args *ap) 3119 { 3120 struct vnode *vp = ap->a_vp; 3121 struct ucred *cred; 3122 struct nfsnode *np = VTONFS(ap->a_vp); 3123 struct proc *p = (struct proc *)ap->a_id; 3124 struct thread *td = curthread; /* XXX */ 3125 struct vattr va; 3126 int ret, error; 3127 u_quad_t size; 3128 3129 error = NFSVOPLOCK(vp, LK_SHARED); 3130 if (error != 0) 3131 return (EBADF); 3132 if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) { 3133 if (vp->v_type != VREG) { 3134 error = EINVAL; 3135 goto out; 3136 } 3137 if ((ap->a_flags & F_POSIX) != 0) 3138 cred = p->p_ucred; 3139 else 3140 cred = td->td_ucred; 3141 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 3142 if (VN_IS_DOOMED(vp)) { 3143 error = EBADF; 3144 goto out; 3145 } 3146 3147 /* 3148 * If this is unlocking a write locked region, flush and 3149 * commit them before unlocking. This is required by 3150 * RFC3530 Sec. 9.3.2. 3151 */ 3152 if (ap->a_op == F_UNLCK && 3153 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id, 3154 ap->a_flags)) 3155 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0); 3156 3157 /* 3158 * Loop around doing the lock op, while a blocking lock 3159 * must wait for the lock op to succeed. 3160 */ 3161 do { 3162 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op, 3163 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags); 3164 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3165 ap->a_op == F_SETLK) { 3166 NFSVOPUNLOCK(vp, 0); 3167 error = nfs_catnap(PZERO | PCATCH, ret, 3168 "ncladvl"); 3169 if (error) 3170 return (EINTR); 3171 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY); 3172 if (VN_IS_DOOMED(vp)) { 3173 error = EBADF; 3174 goto out; 3175 } 3176 } 3177 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3178 ap->a_op == F_SETLK); 3179 if (ret == NFSERR_DENIED) { 3180 error = EAGAIN; 3181 goto out; 3182 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) { 3183 error = ret; 3184 goto out; 3185 } else if (ret != 0) { 3186 error = EACCES; 3187 goto out; 3188 } 3189 3190 /* 3191 * Now, if we just got a lock, invalidate data in the buffer 3192 * cache, as required, so that the coherency conforms with 3193 * RFC3530 Sec. 9.3.2. 3194 */ 3195 if (ap->a_op == F_SETLK) { 3196 if ((np->n_flag & NMODIFIED) == 0) { 3197 np->n_attrstamp = 0; 3198 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3199 ret = VOP_GETATTR(vp, &va, cred); 3200 } 3201 if ((np->n_flag & NMODIFIED) || ret || 3202 np->n_change != va.va_filerev) { 3203 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1); 3204 np->n_attrstamp = 0; 3205 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3206 ret = VOP_GETATTR(vp, &va, cred); 3207 if (!ret) { 3208 np->n_mtime = va.va_mtime; 3209 np->n_change = va.va_filerev; 3210 } 3211 } 3212 /* Mark that a file lock has been acquired. */ 3213 NFSLOCKNODE(np); 3214 np->n_flag |= NHASBEENLOCKED; 3215 NFSUNLOCKNODE(np); 3216 } 3217 } else if (!NFS_ISV4(vp)) { 3218 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3219 size = VTONFS(vp)->n_size; 3220 NFSVOPUNLOCK(vp, 0); 3221 error = lf_advlock(ap, &(vp->v_lockf), size); 3222 } else { 3223 if (nfs_advlock_p != NULL) 3224 error = nfs_advlock_p(ap); 3225 else { 3226 NFSVOPUNLOCK(vp, 0); 3227 error = ENOLCK; 3228 } 3229 } 3230 if (error == 0 && ap->a_op == F_SETLK) { 3231 error = NFSVOPLOCK(vp, LK_SHARED); 3232 if (error == 0) { 3233 /* Mark that a file lock has been acquired. */ 3234 NFSLOCKNODE(np); 3235 np->n_flag |= NHASBEENLOCKED; 3236 NFSUNLOCKNODE(np); 3237 NFSVOPUNLOCK(vp, 0); 3238 } 3239 } 3240 return (error); 3241 } else 3242 error = EOPNOTSUPP; 3243 out: 3244 NFSVOPUNLOCK(vp, 0); 3245 return (error); 3246 } 3247 3248 /* 3249 * NFS advisory byte-level locks. 3250 */ 3251 static int 3252 nfs_advlockasync(struct vop_advlockasync_args *ap) 3253 { 3254 struct vnode *vp = ap->a_vp; 3255 u_quad_t size; 3256 int error; 3257 3258 if (NFS_ISV4(vp)) 3259 return (EOPNOTSUPP); 3260 error = NFSVOPLOCK(vp, LK_SHARED); 3261 if (error) 3262 return (error); 3263 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3264 size = VTONFS(vp)->n_size; 3265 NFSVOPUNLOCK(vp, 0); 3266 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3267 } else { 3268 NFSVOPUNLOCK(vp, 0); 3269 error = EOPNOTSUPP; 3270 } 3271 return (error); 3272 } 3273 3274 /* 3275 * Print out the contents of an nfsnode. 3276 */ 3277 static int 3278 nfs_print(struct vop_print_args *ap) 3279 { 3280 struct vnode *vp = ap->a_vp; 3281 struct nfsnode *np = VTONFS(vp); 3282 3283 printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid, 3284 (uintmax_t)np->n_vattr.na_fsid); 3285 if (vp->v_type == VFIFO) 3286 fifo_printinfo(vp); 3287 printf("\n"); 3288 return (0); 3289 } 3290 3291 /* 3292 * This is the "real" nfs::bwrite(struct buf*). 3293 * We set B_CACHE if this is a VMIO buffer. 3294 */ 3295 int 3296 ncl_writebp(struct buf *bp, int force __unused, struct thread *td) 3297 { 3298 int oldflags, rtval; 3299 3300 if (bp->b_flags & B_INVAL) { 3301 brelse(bp); 3302 return (0); 3303 } 3304 3305 oldflags = bp->b_flags; 3306 bp->b_flags |= B_CACHE; 3307 3308 /* 3309 * Undirty the bp. We will redirty it later if the I/O fails. 3310 */ 3311 bundirty(bp); 3312 bp->b_flags &= ~B_DONE; 3313 bp->b_ioflags &= ~BIO_ERROR; 3314 bp->b_iocmd = BIO_WRITE; 3315 3316 bufobj_wref(bp->b_bufobj); 3317 curthread->td_ru.ru_oublock++; 3318 3319 /* 3320 * Note: to avoid loopback deadlocks, we do not 3321 * assign b_runningbufspace. 3322 */ 3323 vfs_busy_pages(bp, 1); 3324 3325 BUF_KERNPROC(bp); 3326 bp->b_iooffset = dbtob(bp->b_blkno); 3327 bstrategy(bp); 3328 3329 if ((oldflags & B_ASYNC) != 0) 3330 return (0); 3331 3332 rtval = bufwait(bp); 3333 if (oldflags & B_DELWRI) 3334 reassignbuf(bp); 3335 brelse(bp); 3336 return (rtval); 3337 } 3338 3339 /* 3340 * nfs special file access vnode op. 3341 * Essentially just get vattr and then imitate iaccess() since the device is 3342 * local to the client. 3343 */ 3344 static int 3345 nfsspec_access(struct vop_access_args *ap) 3346 { 3347 struct vattr *vap; 3348 struct ucred *cred = ap->a_cred; 3349 struct vnode *vp = ap->a_vp; 3350 accmode_t accmode = ap->a_accmode; 3351 struct vattr vattr; 3352 int error; 3353 3354 /* 3355 * Disallow write attempts on filesystems mounted read-only; 3356 * unless the file is a socket, fifo, or a block or character 3357 * device resident on the filesystem. 3358 */ 3359 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3360 switch (vp->v_type) { 3361 case VREG: 3362 case VDIR: 3363 case VLNK: 3364 return (EROFS); 3365 default: 3366 break; 3367 } 3368 } 3369 vap = &vattr; 3370 error = VOP_GETATTR(vp, vap, cred); 3371 if (error) 3372 goto out; 3373 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3374 accmode, cred, NULL); 3375 out: 3376 return error; 3377 } 3378 3379 /* 3380 * Read wrapper for fifos. 3381 */ 3382 static int 3383 nfsfifo_read(struct vop_read_args *ap) 3384 { 3385 struct nfsnode *np = VTONFS(ap->a_vp); 3386 int error; 3387 3388 /* 3389 * Set access flag. 3390 */ 3391 NFSLOCKNODE(np); 3392 np->n_flag |= NACC; 3393 vfs_timestamp(&np->n_atim); 3394 NFSUNLOCKNODE(np); 3395 error = fifo_specops.vop_read(ap); 3396 return error; 3397 } 3398 3399 /* 3400 * Write wrapper for fifos. 3401 */ 3402 static int 3403 nfsfifo_write(struct vop_write_args *ap) 3404 { 3405 struct nfsnode *np = VTONFS(ap->a_vp); 3406 3407 /* 3408 * Set update flag. 3409 */ 3410 NFSLOCKNODE(np); 3411 np->n_flag |= NUPD; 3412 vfs_timestamp(&np->n_mtim); 3413 NFSUNLOCKNODE(np); 3414 return(fifo_specops.vop_write(ap)); 3415 } 3416 3417 /* 3418 * Close wrapper for fifos. 3419 * 3420 * Update the times on the nfsnode then do fifo close. 3421 */ 3422 static int 3423 nfsfifo_close(struct vop_close_args *ap) 3424 { 3425 struct vnode *vp = ap->a_vp; 3426 struct nfsnode *np = VTONFS(vp); 3427 struct vattr vattr; 3428 struct timespec ts; 3429 3430 NFSLOCKNODE(np); 3431 if (np->n_flag & (NACC | NUPD)) { 3432 vfs_timestamp(&ts); 3433 if (np->n_flag & NACC) 3434 np->n_atim = ts; 3435 if (np->n_flag & NUPD) 3436 np->n_mtim = ts; 3437 np->n_flag |= NCHG; 3438 if (vrefcnt(vp) == 1 && 3439 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3440 VATTR_NULL(&vattr); 3441 if (np->n_flag & NACC) 3442 vattr.va_atime = np->n_atim; 3443 if (np->n_flag & NUPD) 3444 vattr.va_mtime = np->n_mtim; 3445 NFSUNLOCKNODE(np); 3446 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3447 goto out; 3448 } 3449 } 3450 NFSUNLOCKNODE(np); 3451 out: 3452 return (fifo_specops.vop_close(ap)); 3453 } 3454 3455 /* 3456 * Just call ncl_writebp() with the force argument set to 1. 3457 * 3458 * NOTE: B_DONE may or may not be set in a_bp on call. 3459 */ 3460 static int 3461 nfs_bwrite(struct buf *bp) 3462 { 3463 3464 return (ncl_writebp(bp, 1, curthread)); 3465 } 3466 3467 struct buf_ops buf_ops_newnfs = { 3468 .bop_name = "buf_ops_nfs", 3469 .bop_write = nfs_bwrite, 3470 .bop_strategy = bufstrategy, 3471 .bop_sync = bufsync, 3472 .bop_bdflush = bufbdflush, 3473 }; 3474 3475 static int 3476 nfs_getacl(struct vop_getacl_args *ap) 3477 { 3478 int error; 3479 3480 if (ap->a_type != ACL_TYPE_NFS4) 3481 return (EOPNOTSUPP); 3482 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3483 NULL); 3484 if (error > NFSERR_STALE) { 3485 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3486 error = EPERM; 3487 } 3488 return (error); 3489 } 3490 3491 static int 3492 nfs_setacl(struct vop_setacl_args *ap) 3493 { 3494 int error; 3495 3496 if (ap->a_type != ACL_TYPE_NFS4) 3497 return (EOPNOTSUPP); 3498 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3499 NULL); 3500 if (error > NFSERR_STALE) { 3501 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3502 error = EPERM; 3503 } 3504 return (error); 3505 } 3506 3507 /* 3508 * Return POSIX pathconf information applicable to nfs filesystems. 3509 */ 3510 static int 3511 nfs_pathconf(struct vop_pathconf_args *ap) 3512 { 3513 struct nfsv3_pathconf pc; 3514 struct nfsvattr nfsva; 3515 struct vnode *vp = ap->a_vp; 3516 struct thread *td = curthread; 3517 int attrflag, error; 3518 3519 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX || 3520 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED || 3521 ap->a_name == _PC_NO_TRUNC)) || 3522 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) { 3523 /* 3524 * Since only the above 4 a_names are returned by the NFSv3 3525 * Pathconf RPC, there is no point in doing it for others. 3526 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can 3527 * be used for _PC_NFS4_ACL as well. 3528 */ 3529 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva, 3530 &attrflag, NULL); 3531 if (attrflag != 0) 3532 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 3533 1); 3534 if (error != 0) 3535 return (error); 3536 } else { 3537 /* 3538 * For NFSv2 (or NFSv3 when not one of the above 4 a_names), 3539 * just fake them. 3540 */ 3541 pc.pc_linkmax = NFS_LINK_MAX; 3542 pc.pc_namemax = NFS_MAXNAMLEN; 3543 pc.pc_notrunc = 1; 3544 pc.pc_chownrestricted = 1; 3545 pc.pc_caseinsensitive = 0; 3546 pc.pc_casepreserving = 1; 3547 error = 0; 3548 } 3549 switch (ap->a_name) { 3550 case _PC_LINK_MAX: 3551 #ifdef _LP64 3552 *ap->a_retval = pc.pc_linkmax; 3553 #else 3554 *ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax); 3555 #endif 3556 break; 3557 case _PC_NAME_MAX: 3558 *ap->a_retval = pc.pc_namemax; 3559 break; 3560 case _PC_PIPE_BUF: 3561 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 3562 *ap->a_retval = PIPE_BUF; 3563 else 3564 error = EINVAL; 3565 break; 3566 case _PC_CHOWN_RESTRICTED: 3567 *ap->a_retval = pc.pc_chownrestricted; 3568 break; 3569 case _PC_NO_TRUNC: 3570 *ap->a_retval = pc.pc_notrunc; 3571 break; 3572 case _PC_ACL_NFS4: 3573 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 && 3574 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL)) 3575 *ap->a_retval = 1; 3576 else 3577 *ap->a_retval = 0; 3578 break; 3579 case _PC_ACL_PATH_MAX: 3580 if (NFS_ISV4(vp)) 3581 *ap->a_retval = ACL_MAX_ENTRIES; 3582 else 3583 *ap->a_retval = 3; 3584 break; 3585 case _PC_PRIO_IO: 3586 *ap->a_retval = 0; 3587 break; 3588 case _PC_SYNC_IO: 3589 *ap->a_retval = 0; 3590 break; 3591 case _PC_ALLOC_SIZE_MIN: 3592 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize; 3593 break; 3594 case _PC_FILESIZEBITS: 3595 if (NFS_ISV34(vp)) 3596 *ap->a_retval = 64; 3597 else 3598 *ap->a_retval = 32; 3599 break; 3600 case _PC_REC_INCR_XFER_SIZE: 3601 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 3602 break; 3603 case _PC_REC_MAX_XFER_SIZE: 3604 *ap->a_retval = -1; /* means ``unlimited'' */ 3605 break; 3606 case _PC_REC_MIN_XFER_SIZE: 3607 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 3608 break; 3609 case _PC_REC_XFER_ALIGN: 3610 *ap->a_retval = PAGE_SIZE; 3611 break; 3612 case _PC_SYMLINK_MAX: 3613 *ap->a_retval = NFS_MAXPATHLEN; 3614 break; 3615 3616 default: 3617 error = vop_stdpathconf(ap); 3618 break; 3619 } 3620 return (error); 3621 } 3622 3623