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/extattr.h> 55 #include <sys/filio.h> 56 #include <sys/jail.h> 57 #include <sys/malloc.h> 58 #include <sys/mbuf.h> 59 #include <sys/namei.h> 60 #include <sys/socket.h> 61 #include <sys/vnode.h> 62 #include <sys/dirent.h> 63 #include <sys/fcntl.h> 64 #include <sys/lockf.h> 65 #include <sys/stat.h> 66 #include <sys/sysctl.h> 67 #include <sys/signalvar.h> 68 69 #include <vm/vm.h> 70 #include <vm/vm_extern.h> 71 #include <vm/vm_object.h> 72 73 #include <fs/nfs/nfsport.h> 74 #include <fs/nfsclient/nfsnode.h> 75 #include <fs/nfsclient/nfsmount.h> 76 #include <fs/nfsclient/nfs.h> 77 #include <fs/nfsclient/nfs_kdtrace.h> 78 79 #include <net/if.h> 80 #include <netinet/in.h> 81 #include <netinet/in_var.h> 82 83 #include <nfs/nfs_lock.h> 84 85 #ifdef KDTRACE_HOOKS 86 #include <sys/dtrace_bsd.h> 87 88 dtrace_nfsclient_accesscache_flush_probe_func_t 89 dtrace_nfscl_accesscache_flush_done_probe; 90 uint32_t nfscl_accesscache_flush_done_id; 91 92 dtrace_nfsclient_accesscache_get_probe_func_t 93 dtrace_nfscl_accesscache_get_hit_probe, 94 dtrace_nfscl_accesscache_get_miss_probe; 95 uint32_t nfscl_accesscache_get_hit_id; 96 uint32_t nfscl_accesscache_get_miss_id; 97 98 dtrace_nfsclient_accesscache_load_probe_func_t 99 dtrace_nfscl_accesscache_load_done_probe; 100 uint32_t nfscl_accesscache_load_done_id; 101 #endif /* !KDTRACE_HOOKS */ 102 103 /* Defs */ 104 #define TRUE 1 105 #define FALSE 0 106 107 extern struct nfsstatsv1 nfsstatsv1; 108 extern int nfsrv_useacl; 109 extern int nfscl_debuglevel; 110 MALLOC_DECLARE(M_NEWNFSREQ); 111 112 static vop_read_t nfsfifo_read; 113 static vop_write_t nfsfifo_write; 114 static vop_close_t nfsfifo_close; 115 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *, 116 struct thread *); 117 static vop_lookup_t nfs_lookup; 118 static vop_create_t nfs_create; 119 static vop_mknod_t nfs_mknod; 120 static vop_open_t nfs_open; 121 static vop_pathconf_t nfs_pathconf; 122 static vop_close_t nfs_close; 123 static vop_access_t nfs_access; 124 static vop_getattr_t nfs_getattr; 125 static vop_setattr_t nfs_setattr; 126 static vop_read_t nfs_read; 127 static vop_fsync_t nfs_fsync; 128 static vop_remove_t nfs_remove; 129 static vop_link_t nfs_link; 130 static vop_rename_t nfs_rename; 131 static vop_mkdir_t nfs_mkdir; 132 static vop_rmdir_t nfs_rmdir; 133 static vop_symlink_t nfs_symlink; 134 static vop_readdir_t nfs_readdir; 135 static vop_strategy_t nfs_strategy; 136 static int nfs_lookitup(struct vnode *, char *, int, 137 struct ucred *, struct thread *, struct nfsnode **); 138 static int nfs_sillyrename(struct vnode *, struct vnode *, 139 struct componentname *); 140 static vop_access_t nfsspec_access; 141 static vop_readlink_t nfs_readlink; 142 static vop_print_t nfs_print; 143 static vop_advlock_t nfs_advlock; 144 static vop_advlockasync_t nfs_advlockasync; 145 static vop_getacl_t nfs_getacl; 146 static vop_setacl_t nfs_setacl; 147 static vop_advise_t nfs_advise; 148 static vop_allocate_t nfs_allocate; 149 static vop_copy_file_range_t nfs_copy_file_range; 150 static vop_ioctl_t nfs_ioctl; 151 static vop_getextattr_t nfs_getextattr; 152 static vop_setextattr_t nfs_setextattr; 153 static vop_listextattr_t nfs_listextattr; 154 static vop_deleteextattr_t nfs_deleteextattr; 155 static vop_lock1_t nfs_lock; 156 157 /* 158 * Global vfs data structures for nfs 159 */ 160 161 static struct vop_vector newnfs_vnodeops_nosig = { 162 .vop_default = &default_vnodeops, 163 .vop_access = nfs_access, 164 .vop_advlock = nfs_advlock, 165 .vop_advlockasync = nfs_advlockasync, 166 .vop_close = nfs_close, 167 .vop_create = nfs_create, 168 .vop_fsync = nfs_fsync, 169 .vop_getattr = nfs_getattr, 170 .vop_getpages = ncl_getpages, 171 .vop_putpages = ncl_putpages, 172 .vop_inactive = ncl_inactive, 173 .vop_link = nfs_link, 174 .vop_lock1 = nfs_lock, 175 .vop_lookup = nfs_lookup, 176 .vop_mkdir = nfs_mkdir, 177 .vop_mknod = nfs_mknod, 178 .vop_open = nfs_open, 179 .vop_pathconf = nfs_pathconf, 180 .vop_print = nfs_print, 181 .vop_read = nfs_read, 182 .vop_readdir = nfs_readdir, 183 .vop_readlink = nfs_readlink, 184 .vop_reclaim = ncl_reclaim, 185 .vop_remove = nfs_remove, 186 .vop_rename = nfs_rename, 187 .vop_rmdir = nfs_rmdir, 188 .vop_setattr = nfs_setattr, 189 .vop_strategy = nfs_strategy, 190 .vop_symlink = nfs_symlink, 191 .vop_write = ncl_write, 192 .vop_getacl = nfs_getacl, 193 .vop_setacl = nfs_setacl, 194 .vop_advise = nfs_advise, 195 .vop_allocate = nfs_allocate, 196 .vop_copy_file_range = nfs_copy_file_range, 197 .vop_ioctl = nfs_ioctl, 198 .vop_getextattr = nfs_getextattr, 199 .vop_setextattr = nfs_setextattr, 200 .vop_listextattr = nfs_listextattr, 201 .vop_deleteextattr = nfs_deleteextattr, 202 }; 203 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops_nosig); 204 205 static int 206 nfs_vnodeops_bypass(struct vop_generic_args *a) 207 { 208 209 return (vop_sigdefer(&newnfs_vnodeops_nosig, a)); 210 } 211 212 struct vop_vector newnfs_vnodeops = { 213 .vop_default = &default_vnodeops, 214 .vop_bypass = nfs_vnodeops_bypass, 215 }; 216 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops); 217 218 static struct vop_vector newnfs_fifoops_nosig = { 219 .vop_default = &fifo_specops, 220 .vop_access = nfsspec_access, 221 .vop_close = nfsfifo_close, 222 .vop_fsync = nfs_fsync, 223 .vop_getattr = nfs_getattr, 224 .vop_inactive = ncl_inactive, 225 .vop_pathconf = nfs_pathconf, 226 .vop_print = nfs_print, 227 .vop_read = nfsfifo_read, 228 .vop_reclaim = ncl_reclaim, 229 .vop_setattr = nfs_setattr, 230 .vop_write = nfsfifo_write, 231 }; 232 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops_nosig); 233 234 static int 235 nfs_fifoops_bypass(struct vop_generic_args *a) 236 { 237 238 return (vop_sigdefer(&newnfs_fifoops_nosig, a)); 239 } 240 241 struct vop_vector newnfs_fifoops = { 242 .vop_default = &default_vnodeops, 243 .vop_bypass = nfs_fifoops_bypass, 244 }; 245 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops); 246 247 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 248 struct componentname *cnp, struct vattr *vap); 249 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 250 int namelen, struct ucred *cred, struct thread *td); 251 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, 252 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp, 253 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td); 254 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp, 255 struct componentname *scnp, struct sillyrename *sp); 256 257 /* 258 * Global variables 259 */ 260 SYSCTL_DECL(_vfs_nfs); 261 262 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 263 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 264 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 265 266 static int nfs_prime_access_cache = 0; 267 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW, 268 &nfs_prime_access_cache, 0, 269 "Prime NFS ACCESS cache when fetching attributes"); 270 271 static int newnfs_commit_on_close = 0; 272 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW, 273 &newnfs_commit_on_close, 0, "write+commit on close, else only write"); 274 275 static int nfs_clean_pages_on_close = 1; 276 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, 277 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); 278 279 int newnfs_directio_enable = 0; 280 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 281 &newnfs_directio_enable, 0, "Enable NFS directio"); 282 283 int nfs_keep_dirty_on_error; 284 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW, 285 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned"); 286 287 /* 288 * This sysctl allows other processes to mmap a file that has been opened 289 * O_DIRECT by a process. In general, having processes mmap the file while 290 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 291 * this by default to prevent DoS attacks - to prevent a malicious user from 292 * opening up files O_DIRECT preventing other users from mmap'ing these 293 * files. "Protected" environments where stricter consistency guarantees are 294 * required can disable this knob. The process that opened the file O_DIRECT 295 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 296 * meaningful. 297 */ 298 int newnfs_directio_allow_mmap = 1; 299 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 300 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 301 302 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \ 303 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \ 304 | NFSACCESS_DELETE | NFSACCESS_LOOKUP) 305 306 /* 307 * SMP Locking Note : 308 * The list of locks after the description of the lock is the ordering 309 * of other locks acquired with the lock held. 310 * np->n_mtx : Protects the fields in the nfsnode. 311 VM Object Lock 312 VI_MTX (acquired indirectly) 313 * nmp->nm_mtx : Protects the fields in the nfsmount. 314 rep->r_mtx 315 * ncl_iod_mutex : Global lock, protects shared nfsiod state. 316 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. 317 nmp->nm_mtx 318 rep->r_mtx 319 * rep->r_mtx : Protects the fields in an nfsreq. 320 */ 321 322 static int 323 nfs_lock(struct vop_lock1_args *ap) 324 { 325 struct vnode *vp; 326 struct nfsnode *np; 327 u_quad_t nsize; 328 int error, lktype; 329 bool onfault; 330 331 vp = ap->a_vp; 332 lktype = ap->a_flags & LK_TYPE_MASK; 333 error = VOP_LOCK1_APV(&default_vnodeops, ap); 334 if (error != 0 || vp->v_op != &newnfs_vnodeops) 335 return (error); 336 np = VTONFS(vp); 337 if (np == NULL) 338 return (0); 339 NFSLOCKNODE(np); 340 if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED && 341 lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE && 342 lktype != LK_TRYUPGRADE)) { 343 NFSUNLOCKNODE(np); 344 return (0); 345 } 346 onfault = (ap->a_flags & LK_EATTR_MASK) == LK_NOWAIT && 347 (ap->a_flags & LK_INIT_MASK) == LK_CANRECURSE && 348 (lktype == LK_SHARED || lktype == LK_EXCLUSIVE); 349 if (onfault && vp->v_vnlock->lk_recurse == 0) { 350 /* 351 * Force retry in vm_fault(), to make the lock request 352 * sleepable, which allows us to piggy-back the 353 * sleepable call to vnode_pager_setsize(). 354 */ 355 NFSUNLOCKNODE(np); 356 VOP_UNLOCK(vp); 357 return (EBUSY); 358 } 359 if ((ap->a_flags & LK_NOWAIT) != 0 || 360 (lktype == LK_SHARED && vp->v_vnlock->lk_recurse > 0)) { 361 NFSUNLOCKNODE(np); 362 return (0); 363 } 364 if (lktype == LK_SHARED) { 365 NFSUNLOCKNODE(np); 366 VOP_UNLOCK(vp); 367 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 368 ap->a_flags |= LK_EXCLUSIVE; 369 error = VOP_LOCK1_APV(&default_vnodeops, ap); 370 if (error != 0 || vp->v_op != &newnfs_vnodeops) 371 return (error); 372 if (vp->v_data == NULL) 373 goto downgrade; 374 MPASS(vp->v_data == np); 375 NFSLOCKNODE(np); 376 if ((np->n_flag & NVNSETSZSKIP) == 0) { 377 NFSUNLOCKNODE(np); 378 goto downgrade; 379 } 380 } 381 np->n_flag &= ~NVNSETSZSKIP; 382 nsize = np->n_size; 383 NFSUNLOCKNODE(np); 384 vnode_pager_setsize(vp, nsize); 385 downgrade: 386 if (lktype == LK_SHARED) { 387 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 388 ap->a_flags |= LK_DOWNGRADE; 389 (void)VOP_LOCK1_APV(&default_vnodeops, ap); 390 } 391 return (0); 392 } 393 394 static int 395 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td, 396 struct ucred *cred, u_int32_t *retmode) 397 { 398 int error = 0, attrflag, i, lrupos; 399 u_int32_t rmode; 400 struct nfsnode *np = VTONFS(vp); 401 struct nfsvattr nfsva; 402 403 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag, 404 &rmode, NULL); 405 if (attrflag) 406 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 407 if (!error) { 408 lrupos = 0; 409 NFSLOCKNODE(np); 410 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 411 if (np->n_accesscache[i].uid == cred->cr_uid) { 412 np->n_accesscache[i].mode = rmode; 413 np->n_accesscache[i].stamp = time_second; 414 break; 415 } 416 if (i > 0 && np->n_accesscache[i].stamp < 417 np->n_accesscache[lrupos].stamp) 418 lrupos = i; 419 } 420 if (i == NFS_ACCESSCACHESIZE) { 421 np->n_accesscache[lrupos].uid = cred->cr_uid; 422 np->n_accesscache[lrupos].mode = rmode; 423 np->n_accesscache[lrupos].stamp = time_second; 424 } 425 NFSUNLOCKNODE(np); 426 if (retmode != NULL) 427 *retmode = rmode; 428 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0); 429 } else if (NFS_ISV4(vp)) { 430 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 431 } 432 #ifdef KDTRACE_HOOKS 433 if (error != 0) 434 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0, 435 error); 436 #endif 437 return (error); 438 } 439 440 /* 441 * nfs access vnode op. 442 * For nfs version 2, just return ok. File accesses may fail later. 443 * For nfs version 3, use the access rpc to check accessibility. If file modes 444 * are changed on the server, accesses might still fail later. 445 */ 446 static int 447 nfs_access(struct vop_access_args *ap) 448 { 449 struct vnode *vp = ap->a_vp; 450 int error = 0, i, gotahit; 451 u_int32_t mode, wmode, rmode; 452 int v34 = NFS_ISV34(vp); 453 struct nfsnode *np = VTONFS(vp); 454 455 /* 456 * Disallow write attempts on filesystems mounted read-only; 457 * unless the file is a socket, fifo, or a block or character 458 * device resident on the filesystem. 459 */ 460 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS | 461 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL | 462 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { 463 switch (vp->v_type) { 464 case VREG: 465 case VDIR: 466 case VLNK: 467 return (EROFS); 468 default: 469 break; 470 } 471 } 472 /* 473 * For nfs v3 or v4, check to see if we have done this recently, and if 474 * so return our cached result instead of making an ACCESS call. 475 * If not, do an access rpc, otherwise you are stuck emulating 476 * ufs_access() locally using the vattr. This may not be correct, 477 * since the server may apply other access criteria such as 478 * client uid-->server uid mapping that we do not know about. 479 */ 480 if (v34) { 481 if (ap->a_accmode & VREAD) 482 mode = NFSACCESS_READ; 483 else 484 mode = 0; 485 if (vp->v_type != VDIR) { 486 if (ap->a_accmode & VWRITE) 487 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 488 if (ap->a_accmode & VAPPEND) 489 mode |= NFSACCESS_EXTEND; 490 if (ap->a_accmode & VEXEC) 491 mode |= NFSACCESS_EXECUTE; 492 if (ap->a_accmode & VDELETE) 493 mode |= NFSACCESS_DELETE; 494 } else { 495 if (ap->a_accmode & VWRITE) 496 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 497 if (ap->a_accmode & VAPPEND) 498 mode |= NFSACCESS_EXTEND; 499 if (ap->a_accmode & VEXEC) 500 mode |= NFSACCESS_LOOKUP; 501 if (ap->a_accmode & VDELETE) 502 mode |= NFSACCESS_DELETE; 503 if (ap->a_accmode & VDELETE_CHILD) 504 mode |= NFSACCESS_MODIFY; 505 } 506 /* XXX safety belt, only make blanket request if caching */ 507 if (nfsaccess_cache_timeout > 0) { 508 wmode = NFSACCESS_READ | NFSACCESS_MODIFY | 509 NFSACCESS_EXTEND | NFSACCESS_EXECUTE | 510 NFSACCESS_DELETE | NFSACCESS_LOOKUP; 511 } else { 512 wmode = mode; 513 } 514 515 /* 516 * Does our cached result allow us to give a definite yes to 517 * this request? 518 */ 519 gotahit = 0; 520 NFSLOCKNODE(np); 521 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 522 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) { 523 if (time_second < (np->n_accesscache[i].stamp 524 + nfsaccess_cache_timeout) && 525 (np->n_accesscache[i].mode & mode) == mode) { 526 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits); 527 gotahit = 1; 528 } 529 break; 530 } 531 } 532 NFSUNLOCKNODE(np); 533 #ifdef KDTRACE_HOOKS 534 if (gotahit != 0) 535 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp, 536 ap->a_cred->cr_uid, mode); 537 else 538 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp, 539 ap->a_cred->cr_uid, mode); 540 #endif 541 if (gotahit == 0) { 542 /* 543 * Either a no, or a don't know. Go to the wire. 544 */ 545 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 546 error = nfs34_access_otw(vp, wmode, ap->a_td, 547 ap->a_cred, &rmode); 548 if (!error && 549 (rmode & mode) != mode) 550 error = EACCES; 551 } 552 return (error); 553 } else { 554 if ((error = nfsspec_access(ap)) != 0) { 555 return (error); 556 } 557 /* 558 * Attempt to prevent a mapped root from accessing a file 559 * which it shouldn't. We try to read a byte from the file 560 * if the user is root and the file is not zero length. 561 * After calling nfsspec_access, we should have the correct 562 * file size cached. 563 */ 564 NFSLOCKNODE(np); 565 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD) 566 && VTONFS(vp)->n_size > 0) { 567 struct iovec aiov; 568 struct uio auio; 569 char buf[1]; 570 571 NFSUNLOCKNODE(np); 572 aiov.iov_base = buf; 573 aiov.iov_len = 1; 574 auio.uio_iov = &aiov; 575 auio.uio_iovcnt = 1; 576 auio.uio_offset = 0; 577 auio.uio_resid = 1; 578 auio.uio_segflg = UIO_SYSSPACE; 579 auio.uio_rw = UIO_READ; 580 auio.uio_td = ap->a_td; 581 582 if (vp->v_type == VREG) 583 error = ncl_readrpc(vp, &auio, ap->a_cred); 584 else if (vp->v_type == VDIR) { 585 char* bp; 586 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 587 aiov.iov_base = bp; 588 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 589 error = ncl_readdirrpc(vp, &auio, ap->a_cred, 590 ap->a_td); 591 free(bp, M_TEMP); 592 } else if (vp->v_type == VLNK) 593 error = ncl_readlinkrpc(vp, &auio, ap->a_cred); 594 else 595 error = EACCES; 596 } else 597 NFSUNLOCKNODE(np); 598 return (error); 599 } 600 } 601 602 /* 603 * nfs open vnode op 604 * Check to see if the type is ok 605 * and that deletion is not in progress. 606 * For paged in text files, you will need to flush the page cache 607 * if consistency is lost. 608 */ 609 /* ARGSUSED */ 610 static int 611 nfs_open(struct vop_open_args *ap) 612 { 613 struct vnode *vp = ap->a_vp; 614 struct nfsnode *np = VTONFS(vp); 615 struct vattr vattr; 616 int error; 617 int fmode = ap->a_mode; 618 struct ucred *cred; 619 vm_object_t obj; 620 621 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 622 return (EOPNOTSUPP); 623 624 /* 625 * For NFSv4, we need to do the Open Op before cache validation, 626 * so that we conform to RFC3530 Sec. 9.3.1. 627 */ 628 if (NFS_ISV4(vp)) { 629 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td); 630 if (error) { 631 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 632 (gid_t)0); 633 return (error); 634 } 635 } 636 637 /* 638 * Now, if this Open will be doing reading, re-validate/flush the 639 * cache, so that Close/Open coherency is maintained. 640 */ 641 NFSLOCKNODE(np); 642 if (np->n_flag & NMODIFIED) { 643 NFSUNLOCKNODE(np); 644 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 645 if (error == EINTR || error == EIO) { 646 if (NFS_ISV4(vp)) 647 (void) nfsrpc_close(vp, 0, ap->a_td); 648 return (error); 649 } 650 NFSLOCKNODE(np); 651 np->n_attrstamp = 0; 652 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 653 if (vp->v_type == VDIR) 654 np->n_direofoffset = 0; 655 NFSUNLOCKNODE(np); 656 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 657 if (error) { 658 if (NFS_ISV4(vp)) 659 (void) nfsrpc_close(vp, 0, ap->a_td); 660 return (error); 661 } 662 NFSLOCKNODE(np); 663 np->n_mtime = vattr.va_mtime; 664 if (NFS_ISV4(vp)) 665 np->n_change = vattr.va_filerev; 666 } else { 667 NFSUNLOCKNODE(np); 668 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 669 if (error) { 670 if (NFS_ISV4(vp)) 671 (void) nfsrpc_close(vp, 0, ap->a_td); 672 return (error); 673 } 674 NFSLOCKNODE(np); 675 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) || 676 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 677 if (vp->v_type == VDIR) 678 np->n_direofoffset = 0; 679 NFSUNLOCKNODE(np); 680 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 681 if (error == EINTR || error == EIO) { 682 if (NFS_ISV4(vp)) 683 (void) nfsrpc_close(vp, 0, ap->a_td); 684 return (error); 685 } 686 NFSLOCKNODE(np); 687 np->n_mtime = vattr.va_mtime; 688 if (NFS_ISV4(vp)) 689 np->n_change = vattr.va_filerev; 690 } 691 } 692 693 /* 694 * If the object has >= 1 O_DIRECT active opens, we disable caching. 695 */ 696 if (newnfs_directio_enable && (fmode & O_DIRECT) && 697 (vp->v_type == VREG)) { 698 if (np->n_directio_opens == 0) { 699 NFSUNLOCKNODE(np); 700 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 701 if (error) { 702 if (NFS_ISV4(vp)) 703 (void) nfsrpc_close(vp, 0, ap->a_td); 704 return (error); 705 } 706 NFSLOCKNODE(np); 707 np->n_flag |= NNONCACHE; 708 } 709 np->n_directio_opens++; 710 } 711 712 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */ 713 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0) 714 np->n_flag |= NWRITEOPENED; 715 716 /* 717 * If this is an open for writing, capture a reference to the 718 * credentials, so they can be used by ncl_putpages(). Using 719 * these write credentials is preferable to the credentials of 720 * whatever thread happens to be doing the VOP_PUTPAGES() since 721 * the write RPCs are less likely to fail with EACCES. 722 */ 723 if ((fmode & FWRITE) != 0) { 724 cred = np->n_writecred; 725 np->n_writecred = crhold(ap->a_cred); 726 } else 727 cred = NULL; 728 NFSUNLOCKNODE(np); 729 730 if (cred != NULL) 731 crfree(cred); 732 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 733 734 /* 735 * If the text file has been mmap'd, flush any dirty pages to the 736 * buffer cache and then... 737 * Make sure all writes are pushed to the NFS server. If this is not 738 * done, the modify time of the file can change while the text 739 * file is being executed. This will cause the process that is 740 * executing the text file to be terminated. 741 */ 742 if (vp->v_writecount <= -1) { 743 if ((obj = vp->v_object) != NULL && 744 vm_object_mightbedirty(obj)) { 745 VM_OBJECT_WLOCK(obj); 746 vm_object_page_clean(obj, 0, 0, OBJPC_SYNC); 747 VM_OBJECT_WUNLOCK(obj); 748 } 749 750 /* Now, flush the buffer cache. */ 751 ncl_flush(vp, MNT_WAIT, curthread, 0, 0); 752 753 /* And, finally, make sure that n_mtime is up to date. */ 754 np = VTONFS(vp); 755 NFSLOCKNODE(np); 756 np->n_mtime = np->n_vattr.na_mtime; 757 NFSUNLOCKNODE(np); 758 } 759 return (0); 760 } 761 762 /* 763 * nfs close vnode op 764 * What an NFS client should do upon close after writing is a debatable issue. 765 * Most NFS clients push delayed writes to the server upon close, basically for 766 * two reasons: 767 * 1 - So that any write errors may be reported back to the client process 768 * doing the close system call. By far the two most likely errors are 769 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 770 * 2 - To put a worst case upper bound on cache inconsistency between 771 * multiple clients for the file. 772 * There is also a consistency problem for Version 2 of the protocol w.r.t. 773 * not being able to tell if other clients are writing a file concurrently, 774 * since there is no way of knowing if the changed modify time in the reply 775 * is only due to the write for this client. 776 * (NFS Version 3 provides weak cache consistency data in the reply that 777 * should be sufficient to detect and handle this case.) 778 * 779 * The current code does the following: 780 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 781 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 782 * or commit them (this satisfies 1 and 2 except for the 783 * case where the server crashes after this close but 784 * before the commit RPC, which is felt to be "good 785 * enough". Changing the last argument to ncl_flush() to 786 * a 1 would force a commit operation, if it is felt a 787 * commit is necessary now. 788 * for NFS Version 4 - flush the dirty buffers and commit them, if 789 * nfscl_mustflush() says this is necessary. 790 * It is necessary if there is no write delegation held, 791 * in order to satisfy open/close coherency. 792 * If the file isn't cached on local stable storage, 793 * it may be necessary in order to detect "out of space" 794 * errors from the server, if the write delegation 795 * issued by the server doesn't allow the file to grow. 796 */ 797 /* ARGSUSED */ 798 static int 799 nfs_close(struct vop_close_args *ap) 800 { 801 struct vnode *vp = ap->a_vp; 802 struct nfsnode *np = VTONFS(vp); 803 struct nfsvattr nfsva; 804 struct ucred *cred; 805 int error = 0, ret, localcred = 0; 806 int fmode = ap->a_fflag; 807 808 if (NFSCL_FORCEDISM(vp->v_mount)) 809 return (0); 810 /* 811 * During shutdown, a_cred isn't valid, so just use root. 812 */ 813 if (ap->a_cred == NOCRED) { 814 cred = newnfs_getcred(); 815 localcred = 1; 816 } else { 817 cred = ap->a_cred; 818 } 819 if (vp->v_type == VREG) { 820 /* 821 * Examine and clean dirty pages, regardless of NMODIFIED. 822 * This closes a major hole in close-to-open consistency. 823 * We want to push out all dirty pages (and buffers) on 824 * close, regardless of whether they were dirtied by 825 * mmap'ed writes or via write(). 826 */ 827 if (nfs_clean_pages_on_close && vp->v_object) { 828 VM_OBJECT_WLOCK(vp->v_object); 829 vm_object_page_clean(vp->v_object, 0, 0, 0); 830 VM_OBJECT_WUNLOCK(vp->v_object); 831 } 832 NFSLOCKNODE(np); 833 if (np->n_flag & NMODIFIED) { 834 NFSUNLOCKNODE(np); 835 if (NFS_ISV3(vp)) { 836 /* 837 * Under NFSv3 we have dirty buffers to dispose of. We 838 * must flush them to the NFS server. We have the option 839 * of waiting all the way through the commit rpc or just 840 * waiting for the initial write. The default is to only 841 * wait through the initial write so the data is in the 842 * server's cache, which is roughly similar to the state 843 * a standard disk subsystem leaves the file in on close(). 844 * 845 * We cannot clear the NMODIFIED bit in np->n_flag due to 846 * potential races with other processes, and certainly 847 * cannot clear it if we don't commit. 848 * These races occur when there is no longer the old 849 * traditional vnode locking implemented for Vnode Ops. 850 */ 851 int cm = newnfs_commit_on_close ? 1 : 0; 852 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0); 853 /* np->n_flag &= ~NMODIFIED; */ 854 } else if (NFS_ISV4(vp)) { 855 if (nfscl_mustflush(vp) != 0) { 856 int cm = newnfs_commit_on_close ? 1 : 0; 857 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 858 cm, 0); 859 /* 860 * as above w.r.t races when clearing 861 * NMODIFIED. 862 * np->n_flag &= ~NMODIFIED; 863 */ 864 } 865 } else { 866 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 867 } 868 NFSLOCKNODE(np); 869 } 870 /* 871 * Invalidate the attribute cache in all cases. 872 * An open is going to fetch fresh attrs any way, other procs 873 * on this node that have file open will be forced to do an 874 * otw attr fetch, but this is safe. 875 * --> A user found that their RPC count dropped by 20% when 876 * this was commented out and I can't see any requirement 877 * for it, so I've disabled it when negative lookups are 878 * enabled. (What does this have to do with negative lookup 879 * caching? Well nothing, except it was reported by the 880 * same user that needed negative lookup caching and I wanted 881 * there to be a way to disable it to see if it 882 * is the cause of some caching/coherency issue that might 883 * crop up.) 884 */ 885 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) { 886 np->n_attrstamp = 0; 887 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 888 } 889 if (np->n_flag & NWRITEERR) { 890 np->n_flag &= ~NWRITEERR; 891 error = np->n_error; 892 } 893 NFSUNLOCKNODE(np); 894 } 895 896 if (NFS_ISV4(vp)) { 897 /* 898 * Get attributes so "change" is up to date. 899 */ 900 if (error == 0 && nfscl_mustflush(vp) != 0 && 901 vp->v_type == VREG && 902 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) { 903 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva, 904 NULL); 905 if (!ret) { 906 np->n_change = nfsva.na_filerev; 907 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 908 NULL, 0, 0); 909 } 910 } 911 912 /* 913 * and do the close. 914 */ 915 ret = nfsrpc_close(vp, 0, ap->a_td); 916 if (!error && ret) 917 error = ret; 918 if (error) 919 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 920 (gid_t)0); 921 } 922 if (newnfs_directio_enable) 923 KASSERT((np->n_directio_asyncwr == 0), 924 ("nfs_close: dirty unflushed (%d) directio buffers\n", 925 np->n_directio_asyncwr)); 926 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 927 NFSLOCKNODE(np); 928 KASSERT((np->n_directio_opens > 0), 929 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 930 np->n_directio_opens--; 931 if (np->n_directio_opens == 0) 932 np->n_flag &= ~NNONCACHE; 933 NFSUNLOCKNODE(np); 934 } 935 if (localcred) 936 NFSFREECRED(cred); 937 return (error); 938 } 939 940 /* 941 * nfs getattr call from vfs. 942 */ 943 static int 944 nfs_getattr(struct vop_getattr_args *ap) 945 { 946 struct vnode *vp = ap->a_vp; 947 struct thread *td = curthread; /* XXX */ 948 struct nfsnode *np = VTONFS(vp); 949 int error = 0; 950 struct nfsvattr nfsva; 951 struct vattr *vap = ap->a_vap; 952 struct vattr vattr; 953 954 /* 955 * Update local times for special files. 956 */ 957 NFSLOCKNODE(np); 958 if (np->n_flag & (NACC | NUPD)) 959 np->n_flag |= NCHG; 960 NFSUNLOCKNODE(np); 961 /* 962 * First look in the cache. 963 */ 964 if (ncl_getattrcache(vp, &vattr) == 0) { 965 ncl_copy_vattr(vap, &vattr); 966 967 /* 968 * Get the local modify time for the case of a write 969 * delegation. 970 */ 971 nfscl_deleggetmodtime(vp, &vap->va_mtime); 972 return (0); 973 } 974 975 if (NFS_ISV34(vp) && nfs_prime_access_cache && 976 nfsaccess_cache_timeout > 0) { 977 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 978 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL); 979 if (ncl_getattrcache(vp, ap->a_vap) == 0) { 980 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime); 981 return (0); 982 } 983 } 984 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL); 985 if (!error) 986 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0); 987 if (!error) { 988 /* 989 * Get the local modify time for the case of a write 990 * delegation. 991 */ 992 nfscl_deleggetmodtime(vp, &vap->va_mtime); 993 } else if (NFS_ISV4(vp)) { 994 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 995 } 996 return (error); 997 } 998 999 /* 1000 * nfs setattr call. 1001 */ 1002 static int 1003 nfs_setattr(struct vop_setattr_args *ap) 1004 { 1005 struct vnode *vp = ap->a_vp; 1006 struct nfsnode *np = VTONFS(vp); 1007 struct thread *td = curthread; /* XXX */ 1008 struct vattr *vap = ap->a_vap; 1009 int error = 0; 1010 u_quad_t tsize; 1011 1012 #ifndef nolint 1013 tsize = (u_quad_t)0; 1014 #endif 1015 1016 /* 1017 * Setting of flags and marking of atimes are not supported. 1018 */ 1019 if (vap->va_flags != VNOVAL) 1020 return (EOPNOTSUPP); 1021 1022 /* 1023 * Disallow write attempts if the filesystem is mounted read-only. 1024 */ 1025 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 1026 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 1027 vap->va_mtime.tv_sec != VNOVAL || 1028 vap->va_birthtime.tv_sec != VNOVAL || 1029 vap->va_mode != (mode_t)VNOVAL) && 1030 (vp->v_mount->mnt_flag & MNT_RDONLY)) 1031 return (EROFS); 1032 if (vap->va_size != VNOVAL) { 1033 switch (vp->v_type) { 1034 case VDIR: 1035 return (EISDIR); 1036 case VCHR: 1037 case VBLK: 1038 case VSOCK: 1039 case VFIFO: 1040 if (vap->va_mtime.tv_sec == VNOVAL && 1041 vap->va_atime.tv_sec == VNOVAL && 1042 vap->va_birthtime.tv_sec == VNOVAL && 1043 vap->va_mode == (mode_t)VNOVAL && 1044 vap->va_uid == (uid_t)VNOVAL && 1045 vap->va_gid == (gid_t)VNOVAL) 1046 return (0); 1047 vap->va_size = VNOVAL; 1048 break; 1049 default: 1050 /* 1051 * Disallow write attempts if the filesystem is 1052 * mounted read-only. 1053 */ 1054 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1055 return (EROFS); 1056 /* 1057 * We run vnode_pager_setsize() early (why?), 1058 * we must set np->n_size now to avoid vinvalbuf 1059 * V_SAVE races that might setsize a lower 1060 * value. 1061 */ 1062 NFSLOCKNODE(np); 1063 tsize = np->n_size; 1064 NFSUNLOCKNODE(np); 1065 error = ncl_meta_setsize(vp, td, vap->va_size); 1066 NFSLOCKNODE(np); 1067 if (np->n_flag & NMODIFIED) { 1068 tsize = np->n_size; 1069 NFSUNLOCKNODE(np); 1070 error = ncl_vinvalbuf(vp, vap->va_size == 0 ? 1071 0 : V_SAVE, td, 1); 1072 if (error != 0) { 1073 vnode_pager_setsize(vp, tsize); 1074 return (error); 1075 } 1076 /* 1077 * Call nfscl_delegmodtime() to set the modify time 1078 * locally, as required. 1079 */ 1080 nfscl_delegmodtime(vp); 1081 } else 1082 NFSUNLOCKNODE(np); 1083 /* 1084 * np->n_size has already been set to vap->va_size 1085 * in ncl_meta_setsize(). We must set it again since 1086 * nfs_loadattrcache() could be called through 1087 * ncl_meta_setsize() and could modify np->n_size. 1088 */ 1089 NFSLOCKNODE(np); 1090 np->n_vattr.na_size = np->n_size = vap->va_size; 1091 NFSUNLOCKNODE(np); 1092 } 1093 } else { 1094 NFSLOCKNODE(np); 1095 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 1096 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 1097 NFSUNLOCKNODE(np); 1098 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 1099 if (error == EINTR || error == EIO) 1100 return (error); 1101 } else 1102 NFSUNLOCKNODE(np); 1103 } 1104 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 1105 if (error && vap->va_size != VNOVAL) { 1106 NFSLOCKNODE(np); 1107 np->n_size = np->n_vattr.na_size = tsize; 1108 vnode_pager_setsize(vp, tsize); 1109 NFSUNLOCKNODE(np); 1110 } 1111 return (error); 1112 } 1113 1114 /* 1115 * Do an nfs setattr rpc. 1116 */ 1117 static int 1118 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 1119 struct thread *td) 1120 { 1121 struct nfsnode *np = VTONFS(vp); 1122 int error, ret, attrflag, i; 1123 struct nfsvattr nfsva; 1124 1125 if (NFS_ISV34(vp)) { 1126 NFSLOCKNODE(np); 1127 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) 1128 np->n_accesscache[i].stamp = 0; 1129 np->n_flag |= NDELEGMOD; 1130 NFSUNLOCKNODE(np); 1131 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); 1132 } 1133 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag, 1134 NULL); 1135 if (attrflag) { 1136 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1137 if (ret && !error) 1138 error = ret; 1139 } 1140 if (error && NFS_ISV4(vp)) 1141 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid); 1142 return (error); 1143 } 1144 1145 /* 1146 * nfs lookup call, one step at a time... 1147 * First look in cache 1148 * If not found, unlock the directory nfsnode and do the rpc 1149 */ 1150 static int 1151 nfs_lookup(struct vop_lookup_args *ap) 1152 { 1153 struct componentname *cnp = ap->a_cnp; 1154 struct vnode *dvp = ap->a_dvp; 1155 struct vnode **vpp = ap->a_vpp; 1156 struct mount *mp = dvp->v_mount; 1157 int flags = cnp->cn_flags; 1158 struct vnode *newvp; 1159 struct nfsmount *nmp; 1160 struct nfsnode *np, *newnp; 1161 int error = 0, attrflag, dattrflag, ltype, ncticks; 1162 struct thread *td = cnp->cn_thread; 1163 struct nfsfh *nfhp; 1164 struct nfsvattr dnfsva, nfsva; 1165 struct vattr vattr; 1166 struct timespec nctime; 1167 uint32_t openmode; 1168 1169 *vpp = NULLVP; 1170 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) && 1171 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 1172 return (EROFS); 1173 if (dvp->v_type != VDIR) 1174 return (ENOTDIR); 1175 nmp = VFSTONFS(mp); 1176 np = VTONFS(dvp); 1177 1178 /* For NFSv4, wait until any remove is done. */ 1179 NFSLOCKNODE(np); 1180 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) { 1181 np->n_flag |= NREMOVEWANT; 1182 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0); 1183 } 1184 NFSUNLOCKNODE(np); 1185 1186 error = vn_dir_check_exec(dvp, cnp); 1187 if (error != 0) 1188 return (error); 1189 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks); 1190 if (error > 0 && error != ENOENT) 1191 return (error); 1192 if (error == -1) { 1193 /* 1194 * Lookups of "." are special and always return the 1195 * current directory. cache_lookup() already handles 1196 * associated locking bookkeeping, etc. 1197 */ 1198 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 1199 /* XXX: Is this really correct? */ 1200 if (cnp->cn_nameiop != LOOKUP && 1201 (flags & ISLASTCN)) 1202 cnp->cn_flags |= SAVENAME; 1203 return (0); 1204 } 1205 1206 /* 1207 * We only accept a positive hit in the cache if the 1208 * change time of the file matches our cached copy. 1209 * Otherwise, we discard the cache entry and fallback 1210 * to doing a lookup RPC. We also only trust cache 1211 * entries for less than nm_nametimeo seconds. 1212 * 1213 * To better handle stale file handles and attributes, 1214 * clear the attribute cache of this node if it is a 1215 * leaf component, part of an open() call, and not 1216 * locally modified before fetching the attributes. 1217 * This should allow stale file handles to be detected 1218 * here where we can fall back to a LOOKUP RPC to 1219 * recover rather than having nfs_open() detect the 1220 * stale file handle and failing open(2) with ESTALE. 1221 */ 1222 newvp = *vpp; 1223 newnp = VTONFS(newvp); 1224 if (!(nmp->nm_flag & NFSMNT_NOCTO) && 1225 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1226 !(newnp->n_flag & NMODIFIED)) { 1227 NFSLOCKNODE(newnp); 1228 newnp->n_attrstamp = 0; 1229 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1230 NFSUNLOCKNODE(newnp); 1231 } 1232 if (nfscl_nodeleg(newvp, 0) == 0 || 1233 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) && 1234 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 && 1235 timespeccmp(&vattr.va_ctime, &nctime, ==))) { 1236 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1237 if (cnp->cn_nameiop != LOOKUP && 1238 (flags & ISLASTCN)) 1239 cnp->cn_flags |= SAVENAME; 1240 return (0); 1241 } 1242 cache_purge(newvp); 1243 if (dvp != newvp) 1244 vput(newvp); 1245 else 1246 vrele(newvp); 1247 *vpp = NULLVP; 1248 } else if (error == ENOENT) { 1249 if (VN_IS_DOOMED(dvp)) 1250 return (ENOENT); 1251 /* 1252 * We only accept a negative hit in the cache if the 1253 * modification time of the parent directory matches 1254 * the cached copy in the name cache entry. 1255 * Otherwise, we discard all of the negative cache 1256 * entries for this directory. We also only trust 1257 * negative cache entries for up to nm_negnametimeo 1258 * seconds. 1259 */ 1260 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) && 1261 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && 1262 timespeccmp(&vattr.va_mtime, &nctime, ==)) { 1263 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1264 return (ENOENT); 1265 } 1266 cache_purge_negative(dvp); 1267 } 1268 1269 /* 1270 * If this an NFSv4.1/4.2 mount using the "oneopenown" mount 1271 * option, it is possible to do the Open operation in the same 1272 * compound as Lookup, so long as delegations are not being 1273 * issued. This saves doing a separate RPC for Open. 1274 */ 1275 openmode = 0; 1276 NFSLOCKMNT(nmp); 1277 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp) && 1278 (nmp->nm_privflag & NFSMNTP_DELEGISSUED) == 0 && 1279 (!NFSMNT_RDONLY(mp) || (flags & OPENWRITE) == 0) && 1280 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN)) { 1281 if ((flags & OPENREAD) != 0) 1282 openmode |= NFSV4OPEN_ACCESSREAD; 1283 if ((flags & OPENWRITE) != 0) 1284 openmode |= NFSV4OPEN_ACCESSWRITE; 1285 } 1286 NFSUNLOCKMNT(nmp); 1287 1288 newvp = NULLVP; 1289 NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses); 1290 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1291 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1292 NULL, openmode); 1293 if (dattrflag) 1294 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1295 if (error) { 1296 if (newvp != NULLVP) { 1297 vput(newvp); 1298 *vpp = NULLVP; 1299 } 1300 1301 if (error != ENOENT) { 1302 if (NFS_ISV4(dvp)) 1303 error = nfscl_maperr(td, error, (uid_t)0, 1304 (gid_t)0); 1305 return (error); 1306 } 1307 1308 /* The requested file was not found. */ 1309 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1310 (flags & ISLASTCN)) { 1311 /* 1312 * XXX: UFS does a full VOP_ACCESS(dvp, 1313 * VWRITE) here instead of just checking 1314 * MNT_RDONLY. 1315 */ 1316 if (mp->mnt_flag & MNT_RDONLY) 1317 return (EROFS); 1318 cnp->cn_flags |= SAVENAME; 1319 return (EJUSTRETURN); 1320 } 1321 1322 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) { 1323 /* 1324 * Cache the modification time of the parent 1325 * directory from the post-op attributes in 1326 * the name cache entry. The negative cache 1327 * entry will be ignored once the directory 1328 * has changed. Don't bother adding the entry 1329 * if the directory has already changed. 1330 */ 1331 NFSLOCKNODE(np); 1332 if (timespeccmp(&np->n_vattr.na_mtime, 1333 &dnfsva.na_mtime, ==)) { 1334 NFSUNLOCKNODE(np); 1335 cache_enter_time(dvp, NULL, cnp, 1336 &dnfsva.na_mtime, NULL); 1337 } else 1338 NFSUNLOCKNODE(np); 1339 } 1340 return (ENOENT); 1341 } 1342 1343 /* 1344 * Handle RENAME case... 1345 */ 1346 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 1347 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1348 free(nfhp, M_NFSFH); 1349 return (EISDIR); 1350 } 1351 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1352 LK_EXCLUSIVE); 1353 if (error) 1354 return (error); 1355 newvp = NFSTOV(np); 1356 if (attrflag) 1357 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1358 0, 1); 1359 *vpp = newvp; 1360 cnp->cn_flags |= SAVENAME; 1361 return (0); 1362 } 1363 1364 if (flags & ISDOTDOT) { 1365 ltype = NFSVOPISLOCKED(dvp); 1366 error = vfs_busy(mp, MBF_NOWAIT); 1367 if (error != 0) { 1368 vfs_ref(mp); 1369 NFSVOPUNLOCK(dvp); 1370 error = vfs_busy(mp, 0); 1371 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1372 vfs_rel(mp); 1373 if (error == 0 && VN_IS_DOOMED(dvp)) { 1374 vfs_unbusy(mp); 1375 error = ENOENT; 1376 } 1377 if (error != 0) 1378 return (error); 1379 } 1380 NFSVOPUNLOCK(dvp); 1381 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1382 cnp->cn_lkflags); 1383 if (error == 0) 1384 newvp = NFSTOV(np); 1385 vfs_unbusy(mp); 1386 if (newvp != dvp) 1387 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1388 if (VN_IS_DOOMED(dvp)) { 1389 if (error == 0) { 1390 if (newvp == dvp) 1391 vrele(newvp); 1392 else 1393 vput(newvp); 1394 } 1395 error = ENOENT; 1396 } 1397 if (error != 0) 1398 return (error); 1399 if (attrflag) 1400 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1401 0, 1); 1402 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1403 free(nfhp, M_NFSFH); 1404 VREF(dvp); 1405 newvp = dvp; 1406 if (attrflag) 1407 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1408 0, 1); 1409 } else { 1410 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1411 cnp->cn_lkflags); 1412 if (error) 1413 return (error); 1414 newvp = NFSTOV(np); 1415 if (attrflag) 1416 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1417 0, 1); 1418 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1419 !(np->n_flag & NMODIFIED)) { 1420 /* 1421 * Flush the attribute cache when opening a 1422 * leaf node to ensure that fresh attributes 1423 * are fetched in nfs_open() since we did not 1424 * fetch attributes from the LOOKUP reply. 1425 */ 1426 NFSLOCKNODE(np); 1427 np->n_attrstamp = 0; 1428 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1429 NFSUNLOCKNODE(np); 1430 } 1431 } 1432 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1433 cnp->cn_flags |= SAVENAME; 1434 if ((cnp->cn_flags & MAKEENTRY) && dvp != newvp && 1435 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) && 1436 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0)) 1437 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 1438 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime); 1439 *vpp = newvp; 1440 return (0); 1441 } 1442 1443 /* 1444 * nfs read call. 1445 * Just call ncl_bioread() to do the work. 1446 */ 1447 static int 1448 nfs_read(struct vop_read_args *ap) 1449 { 1450 struct vnode *vp = ap->a_vp; 1451 1452 switch (vp->v_type) { 1453 case VREG: 1454 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1455 case VDIR: 1456 return (EISDIR); 1457 default: 1458 return (EOPNOTSUPP); 1459 } 1460 } 1461 1462 /* 1463 * nfs readlink call 1464 */ 1465 static int 1466 nfs_readlink(struct vop_readlink_args *ap) 1467 { 1468 struct vnode *vp = ap->a_vp; 1469 1470 if (vp->v_type != VLNK) 1471 return (EINVAL); 1472 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1473 } 1474 1475 /* 1476 * Do a readlink rpc. 1477 * Called by ncl_doio() from below the buffer cache. 1478 */ 1479 int 1480 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1481 { 1482 int error, ret, attrflag; 1483 struct nfsvattr nfsva; 1484 1485 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva, 1486 &attrflag, NULL); 1487 if (attrflag) { 1488 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1489 if (ret && !error) 1490 error = ret; 1491 } 1492 if (error && NFS_ISV4(vp)) 1493 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1494 return (error); 1495 } 1496 1497 /* 1498 * nfs read rpc call 1499 * Ditto above 1500 */ 1501 int 1502 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1503 { 1504 int error, ret, attrflag; 1505 struct nfsvattr nfsva; 1506 struct nfsmount *nmp; 1507 1508 nmp = VFSTONFS(vp->v_mount); 1509 error = EIO; 1510 attrflag = 0; 1511 if (NFSHASPNFS(nmp)) 1512 error = nfscl_doiods(vp, uiop, NULL, NULL, 1513 NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td); 1514 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error); 1515 if (error != 0) 1516 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, 1517 &attrflag, NULL); 1518 if (attrflag) { 1519 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1520 if (ret && !error) 1521 error = ret; 1522 } 1523 if (error && NFS_ISV4(vp)) 1524 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1525 return (error); 1526 } 1527 1528 /* 1529 * nfs write call 1530 */ 1531 int 1532 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1533 int *iomode, int *must_commit, int called_from_strategy) 1534 { 1535 struct nfsvattr nfsva; 1536 int error, attrflag, ret; 1537 struct nfsmount *nmp; 1538 1539 nmp = VFSTONFS(vp->v_mount); 1540 error = EIO; 1541 attrflag = 0; 1542 if (NFSHASPNFS(nmp)) 1543 error = nfscl_doiods(vp, uiop, iomode, must_commit, 1544 NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td); 1545 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error); 1546 if (error != 0) 1547 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred, 1548 uiop->uio_td, &nfsva, &attrflag, NULL, 1549 called_from_strategy); 1550 if (attrflag) { 1551 if (VTONFS(vp)->n_flag & ND_NFSV4) 1552 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1, 1553 1); 1554 else 1555 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1556 1); 1557 if (ret && !error) 1558 error = ret; 1559 } 1560 if (DOINGASYNC(vp)) 1561 *iomode = NFSWRITE_FILESYNC; 1562 if (error && NFS_ISV4(vp)) 1563 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1564 return (error); 1565 } 1566 1567 /* 1568 * nfs mknod rpc 1569 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1570 * mode set to specify the file type and the size field for rdev. 1571 */ 1572 static int 1573 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1574 struct vattr *vap) 1575 { 1576 struct nfsvattr nfsva, dnfsva; 1577 struct vnode *newvp = NULL; 1578 struct nfsnode *np = NULL, *dnp; 1579 struct nfsfh *nfhp; 1580 struct vattr vattr; 1581 int error = 0, attrflag, dattrflag; 1582 u_int32_t rdev; 1583 1584 if (vap->va_type == VCHR || vap->va_type == VBLK) 1585 rdev = vap->va_rdev; 1586 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1587 rdev = 0xffffffff; 1588 else 1589 return (EOPNOTSUPP); 1590 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1591 return (error); 1592 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap, 1593 rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva, 1594 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 1595 if (!error) { 1596 if (!nfhp) 1597 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1598 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, 1599 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1600 NULL, 0); 1601 if (nfhp) 1602 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1603 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE); 1604 } 1605 if (dattrflag) 1606 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1607 if (!error) { 1608 newvp = NFSTOV(np); 1609 if (attrflag != 0) { 1610 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1611 0, 1); 1612 if (error != 0) 1613 vput(newvp); 1614 } 1615 } 1616 if (!error) { 1617 *vpp = newvp; 1618 } else if (NFS_ISV4(dvp)) { 1619 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid, 1620 vap->va_gid); 1621 } 1622 dnp = VTONFS(dvp); 1623 NFSLOCKNODE(dnp); 1624 dnp->n_flag |= NMODIFIED; 1625 if (!dattrflag) { 1626 dnp->n_attrstamp = 0; 1627 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1628 } 1629 NFSUNLOCKNODE(dnp); 1630 return (error); 1631 } 1632 1633 /* 1634 * nfs mknod vop 1635 * just call nfs_mknodrpc() to do the work. 1636 */ 1637 /* ARGSUSED */ 1638 static int 1639 nfs_mknod(struct vop_mknod_args *ap) 1640 { 1641 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1642 } 1643 1644 static struct mtx nfs_cverf_mtx; 1645 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex", 1646 MTX_DEF); 1647 1648 static nfsquad_t 1649 nfs_get_cverf(void) 1650 { 1651 static nfsquad_t cverf; 1652 nfsquad_t ret; 1653 static int cverf_initialized = 0; 1654 1655 mtx_lock(&nfs_cverf_mtx); 1656 if (cverf_initialized == 0) { 1657 cverf.lval[0] = arc4random(); 1658 cverf.lval[1] = arc4random(); 1659 cverf_initialized = 1; 1660 } else 1661 cverf.qval++; 1662 ret = cverf; 1663 mtx_unlock(&nfs_cverf_mtx); 1664 1665 return (ret); 1666 } 1667 1668 /* 1669 * nfs file create call 1670 */ 1671 static int 1672 nfs_create(struct vop_create_args *ap) 1673 { 1674 struct vnode *dvp = ap->a_dvp; 1675 struct vattr *vap = ap->a_vap; 1676 struct componentname *cnp = ap->a_cnp; 1677 struct nfsnode *np = NULL, *dnp; 1678 struct vnode *newvp = NULL; 1679 struct nfsmount *nmp; 1680 struct nfsvattr dnfsva, nfsva; 1681 struct nfsfh *nfhp; 1682 nfsquad_t cverf; 1683 int error = 0, attrflag, dattrflag, fmode = 0; 1684 struct vattr vattr; 1685 1686 /* 1687 * Oops, not for me.. 1688 */ 1689 if (vap->va_type == VSOCK) 1690 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1691 1692 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1693 return (error); 1694 if (vap->va_vaflags & VA_EXCLUSIVE) 1695 fmode |= O_EXCL; 1696 dnp = VTONFS(dvp); 1697 nmp = VFSTONFS(dvp->v_mount); 1698 again: 1699 /* For NFSv4, wait until any remove is done. */ 1700 NFSLOCKNODE(dnp); 1701 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) { 1702 dnp->n_flag |= NREMOVEWANT; 1703 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0); 1704 } 1705 NFSUNLOCKNODE(dnp); 1706 1707 cverf = nfs_get_cverf(); 1708 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1709 vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, 1710 &nfhp, &attrflag, &dattrflag, NULL); 1711 if (!error) { 1712 if (nfhp == NULL) 1713 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1714 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, 1715 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1716 NULL, 0); 1717 if (nfhp != NULL) 1718 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1719 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE); 1720 } 1721 if (dattrflag) 1722 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1723 if (!error) { 1724 newvp = NFSTOV(np); 1725 if (attrflag == 0) 1726 error = nfsrpc_getattr(newvp, cnp->cn_cred, 1727 cnp->cn_thread, &nfsva, NULL); 1728 if (error == 0) 1729 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1730 0, 1); 1731 } 1732 if (error) { 1733 if (newvp != NULL) { 1734 vput(newvp); 1735 newvp = NULL; 1736 } 1737 if (NFS_ISV34(dvp) && (fmode & O_EXCL) && 1738 error == NFSERR_NOTSUPP) { 1739 fmode &= ~O_EXCL; 1740 goto again; 1741 } 1742 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) { 1743 if (nfscl_checksattr(vap, &nfsva)) { 1744 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred, 1745 cnp->cn_thread, &nfsva, &attrflag, NULL); 1746 if (error && (vap->va_uid != (uid_t)VNOVAL || 1747 vap->va_gid != (gid_t)VNOVAL)) { 1748 /* try again without setting uid/gid */ 1749 vap->va_uid = (uid_t)VNOVAL; 1750 vap->va_gid = (uid_t)VNOVAL; 1751 error = nfsrpc_setattr(newvp, vap, NULL, 1752 cnp->cn_cred, cnp->cn_thread, &nfsva, 1753 &attrflag, NULL); 1754 } 1755 if (attrflag) 1756 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 1757 NULL, 0, 1); 1758 if (error != 0) 1759 vput(newvp); 1760 } 1761 } 1762 if (!error) { 1763 if ((cnp->cn_flags & MAKEENTRY) && attrflag) { 1764 if (dvp != newvp) 1765 cache_enter_time(dvp, newvp, cnp, 1766 &nfsva.na_ctime, NULL); 1767 else 1768 printf("nfs_create: bogus NFS server returned " 1769 "the directory as the new file object\n"); 1770 } 1771 *ap->a_vpp = newvp; 1772 } else if (NFS_ISV4(dvp)) { 1773 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid, 1774 vap->va_gid); 1775 } 1776 NFSLOCKNODE(dnp); 1777 dnp->n_flag |= NMODIFIED; 1778 if (!dattrflag) { 1779 dnp->n_attrstamp = 0; 1780 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1781 } 1782 NFSUNLOCKNODE(dnp); 1783 return (error); 1784 } 1785 1786 /* 1787 * nfs file remove call 1788 * To try and make nfs semantics closer to ufs semantics, a file that has 1789 * other processes using the vnode is renamed instead of removed and then 1790 * removed later on the last close. 1791 * - If v_usecount > 1 1792 * If a rename is not already in the works 1793 * call nfs_sillyrename() to set it up 1794 * else 1795 * do the remove rpc 1796 */ 1797 static int 1798 nfs_remove(struct vop_remove_args *ap) 1799 { 1800 struct vnode *vp = ap->a_vp; 1801 struct vnode *dvp = ap->a_dvp; 1802 struct componentname *cnp = ap->a_cnp; 1803 struct nfsnode *np = VTONFS(vp); 1804 int error = 0; 1805 struct vattr vattr; 1806 1807 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name")); 1808 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount")); 1809 if (vp->v_type == VDIR) 1810 error = EPERM; 1811 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1812 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1813 vattr.va_nlink > 1)) { 1814 /* 1815 * Purge the name cache so that the chance of a lookup for 1816 * the name succeeding while the remove is in progress is 1817 * minimized. Without node locking it can still happen, such 1818 * that an I/O op returns ESTALE, but since you get this if 1819 * another host removes the file.. 1820 */ 1821 cache_purge(vp); 1822 /* 1823 * throw away biocache buffers, mainly to avoid 1824 * unnecessary delayed writes later. 1825 */ 1826 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1); 1827 if (error != EINTR && error != EIO) 1828 /* Do the rpc */ 1829 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr, 1830 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1831 /* 1832 * Kludge City: If the first reply to the remove rpc is lost.. 1833 * the reply to the retransmitted request will be ENOENT 1834 * since the file was in fact removed 1835 * Therefore, we cheat and return success. 1836 */ 1837 if (error == ENOENT) 1838 error = 0; 1839 } else if (!np->n_sillyrename) 1840 error = nfs_sillyrename(dvp, vp, cnp); 1841 NFSLOCKNODE(np); 1842 np->n_attrstamp = 0; 1843 NFSUNLOCKNODE(np); 1844 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1845 return (error); 1846 } 1847 1848 /* 1849 * nfs file remove rpc called from nfs_inactive 1850 */ 1851 int 1852 ncl_removeit(struct sillyrename *sp, struct vnode *vp) 1853 { 1854 /* 1855 * Make sure that the directory vnode is still valid. 1856 * XXX we should lock sp->s_dvp here. 1857 */ 1858 if (sp->s_dvp->v_type == VBAD) 1859 return (0); 1860 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen, 1861 sp->s_cred, NULL)); 1862 } 1863 1864 /* 1865 * Nfs remove rpc, called from nfs_remove() and ncl_removeit(). 1866 */ 1867 static int 1868 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 1869 int namelen, struct ucred *cred, struct thread *td) 1870 { 1871 struct nfsvattr dnfsva; 1872 struct nfsnode *dnp = VTONFS(dvp); 1873 int error = 0, dattrflag; 1874 1875 NFSLOCKNODE(dnp); 1876 dnp->n_flag |= NREMOVEINPROG; 1877 NFSUNLOCKNODE(dnp); 1878 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva, 1879 &dattrflag, NULL); 1880 NFSLOCKNODE(dnp); 1881 if ((dnp->n_flag & NREMOVEWANT)) { 1882 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG); 1883 NFSUNLOCKNODE(dnp); 1884 wakeup((caddr_t)dnp); 1885 } else { 1886 dnp->n_flag &= ~NREMOVEINPROG; 1887 NFSUNLOCKNODE(dnp); 1888 } 1889 if (dattrflag) 1890 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1891 NFSLOCKNODE(dnp); 1892 dnp->n_flag |= NMODIFIED; 1893 if (!dattrflag) { 1894 dnp->n_attrstamp = 0; 1895 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1896 } 1897 NFSUNLOCKNODE(dnp); 1898 if (error && NFS_ISV4(dvp)) 1899 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1900 return (error); 1901 } 1902 1903 /* 1904 * nfs file rename call 1905 */ 1906 static int 1907 nfs_rename(struct vop_rename_args *ap) 1908 { 1909 struct vnode *fvp = ap->a_fvp; 1910 struct vnode *tvp = ap->a_tvp; 1911 struct vnode *fdvp = ap->a_fdvp; 1912 struct vnode *tdvp = ap->a_tdvp; 1913 struct componentname *tcnp = ap->a_tcnp; 1914 struct componentname *fcnp = ap->a_fcnp; 1915 struct nfsnode *fnp = VTONFS(ap->a_fvp); 1916 struct nfsnode *tdnp = VTONFS(ap->a_tdvp); 1917 struct nfsv4node *newv4 = NULL; 1918 int error; 1919 1920 KASSERT((tcnp->cn_flags & HASBUF) != 0 && 1921 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name")); 1922 /* Check for cross-device rename */ 1923 if ((fvp->v_mount != tdvp->v_mount) || 1924 (tvp && (fvp->v_mount != tvp->v_mount))) { 1925 error = EXDEV; 1926 goto out; 1927 } 1928 1929 if (fvp == tvp) { 1930 printf("nfs_rename: fvp == tvp (can't happen)\n"); 1931 error = 0; 1932 goto out; 1933 } 1934 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0) 1935 goto out; 1936 1937 /* 1938 * We have to flush B_DELWRI data prior to renaming 1939 * the file. If we don't, the delayed-write buffers 1940 * can be flushed out later after the file has gone stale 1941 * under NFSV3. NFSV2 does not have this problem because 1942 * ( as far as I can tell ) it flushes dirty buffers more 1943 * often. 1944 * 1945 * Skip the rename operation if the fsync fails, this can happen 1946 * due to the server's volume being full, when we pushed out data 1947 * that was written back to our cache earlier. Not checking for 1948 * this condition can result in potential (silent) data loss. 1949 */ 1950 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread); 1951 NFSVOPUNLOCK(fvp); 1952 if (!error && tvp) 1953 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread); 1954 if (error) 1955 goto out; 1956 1957 /* 1958 * If the tvp exists and is in use, sillyrename it before doing the 1959 * rename of the new file over it. 1960 * XXX Can't sillyrename a directory. 1961 */ 1962 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1963 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1964 vput(tvp); 1965 tvp = NULL; 1966 } 1967 1968 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1969 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1970 tcnp->cn_thread); 1971 1972 if (error == 0 && NFS_ISV4(tdvp)) { 1973 /* 1974 * For NFSv4, check to see if it is the same name and 1975 * replace the name, if it is different. 1976 */ 1977 newv4 = malloc( 1978 sizeof (struct nfsv4node) + 1979 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1, 1980 M_NFSV4NODE, M_WAITOK); 1981 NFSLOCKNODE(tdnp); 1982 NFSLOCKNODE(fnp); 1983 if (fnp->n_v4 != NULL && fvp->v_type == VREG && 1984 (fnp->n_v4->n4_namelen != tcnp->cn_namelen || 1985 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4), 1986 tcnp->cn_namelen) || 1987 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen || 1988 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 1989 tdnp->n_fhp->nfh_len))) { 1990 #ifdef notdef 1991 { char nnn[100]; int nnnl; 1992 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99; 1993 bcopy(tcnp->cn_nameptr, nnn, nnnl); 1994 nnn[nnnl] = '\0'; 1995 printf("ren replace=%s\n",nnn); 1996 } 1997 #endif 1998 free(fnp->n_v4, M_NFSV4NODE); 1999 fnp->n_v4 = newv4; 2000 newv4 = NULL; 2001 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len; 2002 fnp->n_v4->n4_namelen = tcnp->cn_namelen; 2003 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 2004 tdnp->n_fhp->nfh_len); 2005 NFSBCOPY(tcnp->cn_nameptr, 2006 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen); 2007 } 2008 NFSUNLOCKNODE(tdnp); 2009 NFSUNLOCKNODE(fnp); 2010 if (newv4 != NULL) 2011 free(newv4, M_NFSV4NODE); 2012 } 2013 2014 if (fvp->v_type == VDIR) { 2015 if (tvp != NULL && tvp->v_type == VDIR) 2016 cache_purge(tdvp); 2017 cache_purge(fdvp); 2018 } 2019 2020 out: 2021 if (tdvp == tvp) 2022 vrele(tdvp); 2023 else 2024 vput(tdvp); 2025 if (tvp) 2026 vput(tvp); 2027 vrele(fdvp); 2028 vrele(fvp); 2029 /* 2030 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 2031 */ 2032 if (error == ENOENT) 2033 error = 0; 2034 return (error); 2035 } 2036 2037 /* 2038 * nfs file rename rpc called from nfs_remove() above 2039 */ 2040 static int 2041 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp, 2042 struct sillyrename *sp) 2043 { 2044 2045 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen, 2046 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred, 2047 scnp->cn_thread)); 2048 } 2049 2050 /* 2051 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 2052 */ 2053 static int 2054 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr, 2055 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr, 2056 int tnamelen, struct ucred *cred, struct thread *td) 2057 { 2058 struct nfsvattr fnfsva, tnfsva; 2059 struct nfsnode *fdnp = VTONFS(fdvp); 2060 struct nfsnode *tdnp = VTONFS(tdvp); 2061 int error = 0, fattrflag, tattrflag; 2062 2063 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp, 2064 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag, 2065 &tattrflag, NULL, NULL); 2066 NFSLOCKNODE(fdnp); 2067 fdnp->n_flag |= NMODIFIED; 2068 if (fattrflag != 0) { 2069 NFSUNLOCKNODE(fdnp); 2070 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1); 2071 } else { 2072 fdnp->n_attrstamp = 0; 2073 NFSUNLOCKNODE(fdnp); 2074 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 2075 } 2076 NFSLOCKNODE(tdnp); 2077 tdnp->n_flag |= NMODIFIED; 2078 if (tattrflag != 0) { 2079 NFSUNLOCKNODE(tdnp); 2080 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1); 2081 } else { 2082 tdnp->n_attrstamp = 0; 2083 NFSUNLOCKNODE(tdnp); 2084 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2085 } 2086 if (error && NFS_ISV4(fdvp)) 2087 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2088 return (error); 2089 } 2090 2091 /* 2092 * nfs hard link create call 2093 */ 2094 static int 2095 nfs_link(struct vop_link_args *ap) 2096 { 2097 struct vnode *vp = ap->a_vp; 2098 struct vnode *tdvp = ap->a_tdvp; 2099 struct componentname *cnp = ap->a_cnp; 2100 struct nfsnode *np, *tdnp; 2101 struct nfsvattr nfsva, dnfsva; 2102 int error = 0, attrflag, dattrflag; 2103 2104 /* 2105 * Push all writes to the server, so that the attribute cache 2106 * doesn't get "out of sync" with the server. 2107 * XXX There should be a better way! 2108 */ 2109 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread); 2110 2111 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 2112 cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag, 2113 &dattrflag, NULL); 2114 tdnp = VTONFS(tdvp); 2115 NFSLOCKNODE(tdnp); 2116 tdnp->n_flag |= NMODIFIED; 2117 if (dattrflag != 0) { 2118 NFSUNLOCKNODE(tdnp); 2119 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1); 2120 } else { 2121 tdnp->n_attrstamp = 0; 2122 NFSUNLOCKNODE(tdnp); 2123 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2124 } 2125 if (attrflag) 2126 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2127 else { 2128 np = VTONFS(vp); 2129 NFSLOCKNODE(np); 2130 np->n_attrstamp = 0; 2131 NFSUNLOCKNODE(np); 2132 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 2133 } 2134 /* 2135 * If negative lookup caching is enabled, I might as well 2136 * add an entry for this node. Not necessary for correctness, 2137 * but if negative caching is enabled, then the system 2138 * must care about lookup caching hit rate, so... 2139 */ 2140 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 && 2141 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2142 if (tdvp != vp) 2143 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL); 2144 else 2145 printf("nfs_link: bogus NFS server returned " 2146 "the directory as the new link\n"); 2147 } 2148 if (error && NFS_ISV4(vp)) 2149 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0, 2150 (gid_t)0); 2151 return (error); 2152 } 2153 2154 /* 2155 * nfs symbolic link create call 2156 */ 2157 static int 2158 nfs_symlink(struct vop_symlink_args *ap) 2159 { 2160 struct vnode *dvp = ap->a_dvp; 2161 struct vattr *vap = ap->a_vap; 2162 struct componentname *cnp = ap->a_cnp; 2163 struct nfsvattr nfsva, dnfsva; 2164 struct nfsfh *nfhp; 2165 struct nfsnode *np = NULL, *dnp; 2166 struct vnode *newvp = NULL; 2167 int error = 0, attrflag, dattrflag, ret; 2168 2169 vap->va_type = VLNK; 2170 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2171 ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, 2172 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 2173 if (nfhp) { 2174 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread, 2175 &np, NULL, LK_EXCLUSIVE); 2176 if (!ret) 2177 newvp = NFSTOV(np); 2178 else if (!error) 2179 error = ret; 2180 } 2181 if (newvp != NULL) { 2182 if (attrflag) 2183 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2184 0, 1); 2185 } else if (!error) { 2186 /* 2187 * If we do not have an error and we could not extract the 2188 * newvp from the response due to the request being NFSv2, we 2189 * have to do a lookup in order to obtain a newvp to return. 2190 */ 2191 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2192 cnp->cn_cred, cnp->cn_thread, &np); 2193 if (!error) 2194 newvp = NFSTOV(np); 2195 } 2196 if (error) { 2197 if (newvp) 2198 vput(newvp); 2199 if (NFS_ISV4(dvp)) 2200 error = nfscl_maperr(cnp->cn_thread, error, 2201 vap->va_uid, vap->va_gid); 2202 } else { 2203 *ap->a_vpp = newvp; 2204 } 2205 2206 dnp = VTONFS(dvp); 2207 NFSLOCKNODE(dnp); 2208 dnp->n_flag |= NMODIFIED; 2209 if (dattrflag != 0) { 2210 NFSUNLOCKNODE(dnp); 2211 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2212 } else { 2213 dnp->n_attrstamp = 0; 2214 NFSUNLOCKNODE(dnp); 2215 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2216 } 2217 /* 2218 * If negative lookup caching is enabled, I might as well 2219 * add an entry for this node. Not necessary for correctness, 2220 * but if negative caching is enabled, then the system 2221 * must care about lookup caching hit rate, so... 2222 */ 2223 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2224 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2225 if (dvp != newvp) 2226 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 2227 NULL); 2228 else 2229 printf("nfs_symlink: bogus NFS server returned " 2230 "the directory as the new file object\n"); 2231 } 2232 return (error); 2233 } 2234 2235 /* 2236 * nfs make dir call 2237 */ 2238 static int 2239 nfs_mkdir(struct vop_mkdir_args *ap) 2240 { 2241 struct vnode *dvp = ap->a_dvp; 2242 struct vattr *vap = ap->a_vap; 2243 struct componentname *cnp = ap->a_cnp; 2244 struct nfsnode *np = NULL, *dnp; 2245 struct vnode *newvp = NULL; 2246 struct vattr vattr; 2247 struct nfsfh *nfhp; 2248 struct nfsvattr nfsva, dnfsva; 2249 int error = 0, attrflag, dattrflag, ret; 2250 2251 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2252 return (error); 2253 vap->va_type = VDIR; 2254 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2255 vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp, 2256 &attrflag, &dattrflag, NULL); 2257 dnp = VTONFS(dvp); 2258 NFSLOCKNODE(dnp); 2259 dnp->n_flag |= NMODIFIED; 2260 if (dattrflag != 0) { 2261 NFSUNLOCKNODE(dnp); 2262 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2263 } else { 2264 dnp->n_attrstamp = 0; 2265 NFSUNLOCKNODE(dnp); 2266 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2267 } 2268 if (nfhp) { 2269 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread, 2270 &np, NULL, LK_EXCLUSIVE); 2271 if (!ret) { 2272 newvp = NFSTOV(np); 2273 if (attrflag) 2274 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 2275 NULL, 0, 1); 2276 } else if (!error) 2277 error = ret; 2278 } 2279 if (!error && newvp == NULL) { 2280 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2281 cnp->cn_cred, cnp->cn_thread, &np); 2282 if (!error) { 2283 newvp = NFSTOV(np); 2284 if (newvp->v_type != VDIR) 2285 error = EEXIST; 2286 } 2287 } 2288 if (error) { 2289 if (newvp) 2290 vput(newvp); 2291 if (NFS_ISV4(dvp)) 2292 error = nfscl_maperr(cnp->cn_thread, error, 2293 vap->va_uid, vap->va_gid); 2294 } else { 2295 /* 2296 * If negative lookup caching is enabled, I might as well 2297 * add an entry for this node. Not necessary for correctness, 2298 * but if negative caching is enabled, then the system 2299 * must care about lookup caching hit rate, so... 2300 */ 2301 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2302 (cnp->cn_flags & MAKEENTRY) && 2303 attrflag != 0 && dattrflag != 0) { 2304 if (dvp != newvp) 2305 cache_enter_time(dvp, newvp, cnp, 2306 &nfsva.na_ctime, &dnfsva.na_ctime); 2307 else 2308 printf("nfs_mkdir: bogus NFS server returned " 2309 "the directory that the directory was " 2310 "created in as the new file object\n"); 2311 } 2312 *ap->a_vpp = newvp; 2313 } 2314 return (error); 2315 } 2316 2317 /* 2318 * nfs remove directory call 2319 */ 2320 static int 2321 nfs_rmdir(struct vop_rmdir_args *ap) 2322 { 2323 struct vnode *vp = ap->a_vp; 2324 struct vnode *dvp = ap->a_dvp; 2325 struct componentname *cnp = ap->a_cnp; 2326 struct nfsnode *dnp; 2327 struct nfsvattr dnfsva; 2328 int error, dattrflag; 2329 2330 if (dvp == vp) 2331 return (EINVAL); 2332 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2333 cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL); 2334 dnp = VTONFS(dvp); 2335 NFSLOCKNODE(dnp); 2336 dnp->n_flag |= NMODIFIED; 2337 if (dattrflag != 0) { 2338 NFSUNLOCKNODE(dnp); 2339 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2340 } else { 2341 dnp->n_attrstamp = 0; 2342 NFSUNLOCKNODE(dnp); 2343 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2344 } 2345 2346 cache_purge(dvp); 2347 cache_purge(vp); 2348 if (error && NFS_ISV4(dvp)) 2349 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0, 2350 (gid_t)0); 2351 /* 2352 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2353 */ 2354 if (error == ENOENT) 2355 error = 0; 2356 return (error); 2357 } 2358 2359 /* 2360 * nfs readdir call 2361 */ 2362 static int 2363 nfs_readdir(struct vop_readdir_args *ap) 2364 { 2365 struct vnode *vp = ap->a_vp; 2366 struct nfsnode *np = VTONFS(vp); 2367 struct uio *uio = ap->a_uio; 2368 ssize_t tresid, left; 2369 int error = 0; 2370 struct vattr vattr; 2371 2372 if (ap->a_eofflag != NULL) 2373 *ap->a_eofflag = 0; 2374 if (vp->v_type != VDIR) 2375 return(EPERM); 2376 2377 /* 2378 * First, check for hit on the EOF offset cache 2379 */ 2380 NFSLOCKNODE(np); 2381 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2382 (np->n_flag & NMODIFIED) == 0) { 2383 NFSUNLOCKNODE(np); 2384 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2385 NFSLOCKNODE(np); 2386 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) || 2387 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2388 NFSUNLOCKNODE(np); 2389 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits); 2390 if (ap->a_eofflag != NULL) 2391 *ap->a_eofflag = 1; 2392 return (0); 2393 } else 2394 NFSUNLOCKNODE(np); 2395 } 2396 } else 2397 NFSUNLOCKNODE(np); 2398 2399 /* 2400 * NFS always guarantees that directory entries don't straddle 2401 * DIRBLKSIZ boundaries. As such, we need to limit the size 2402 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial 2403 * directory entry. 2404 */ 2405 left = uio->uio_resid % DIRBLKSIZ; 2406 if (left == uio->uio_resid) 2407 return (EINVAL); 2408 uio->uio_resid -= left; 2409 2410 /* 2411 * Call ncl_bioread() to do the real work. 2412 */ 2413 tresid = uio->uio_resid; 2414 error = ncl_bioread(vp, uio, 0, ap->a_cred); 2415 2416 if (!error && uio->uio_resid == tresid) { 2417 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses); 2418 if (ap->a_eofflag != NULL) 2419 *ap->a_eofflag = 1; 2420 } 2421 2422 /* Add the partial DIRBLKSIZ (left) back in. */ 2423 uio->uio_resid += left; 2424 return (error); 2425 } 2426 2427 /* 2428 * Readdir rpc call. 2429 * Called from below the buffer cache by ncl_doio(). 2430 */ 2431 int 2432 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2433 struct thread *td) 2434 { 2435 struct nfsvattr nfsva; 2436 nfsuint64 *cookiep, cookie; 2437 struct nfsnode *dnp = VTONFS(vp); 2438 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2439 int error = 0, eof, attrflag; 2440 2441 KASSERT(uiop->uio_iovcnt == 1 && 2442 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2443 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2444 ("nfs readdirrpc bad uio")); 2445 2446 /* 2447 * If there is no cookie, assume directory was stale. 2448 */ 2449 ncl_dircookie_lock(dnp); 2450 NFSUNLOCKNODE(dnp); 2451 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2452 if (cookiep) { 2453 cookie = *cookiep; 2454 ncl_dircookie_unlock(dnp); 2455 } else { 2456 ncl_dircookie_unlock(dnp); 2457 return (NFSERR_BAD_COOKIE); 2458 } 2459 2460 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2461 (void)ncl_fsinfo(nmp, vp, cred, td); 2462 2463 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva, 2464 &attrflag, &eof, NULL); 2465 if (attrflag) 2466 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2467 2468 if (!error) { 2469 /* 2470 * We are now either at the end of the directory or have filled 2471 * the block. 2472 */ 2473 if (eof) { 2474 NFSLOCKNODE(dnp); 2475 dnp->n_direofoffset = uiop->uio_offset; 2476 NFSUNLOCKNODE(dnp); 2477 } else { 2478 if (uiop->uio_resid > 0) 2479 printf("EEK! readdirrpc resid > 0\n"); 2480 ncl_dircookie_lock(dnp); 2481 NFSUNLOCKNODE(dnp); 2482 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2483 *cookiep = cookie; 2484 ncl_dircookie_unlock(dnp); 2485 } 2486 } else if (NFS_ISV4(vp)) { 2487 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2488 } 2489 return (error); 2490 } 2491 2492 /* 2493 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc(). 2494 */ 2495 int 2496 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2497 struct thread *td) 2498 { 2499 struct nfsvattr nfsva; 2500 nfsuint64 *cookiep, cookie; 2501 struct nfsnode *dnp = VTONFS(vp); 2502 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2503 int error = 0, attrflag, eof; 2504 2505 KASSERT(uiop->uio_iovcnt == 1 && 2506 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2507 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2508 ("nfs readdirplusrpc bad uio")); 2509 2510 /* 2511 * If there is no cookie, assume directory was stale. 2512 */ 2513 ncl_dircookie_lock(dnp); 2514 NFSUNLOCKNODE(dnp); 2515 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2516 if (cookiep) { 2517 cookie = *cookiep; 2518 ncl_dircookie_unlock(dnp); 2519 } else { 2520 ncl_dircookie_unlock(dnp); 2521 return (NFSERR_BAD_COOKIE); 2522 } 2523 2524 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2525 (void)ncl_fsinfo(nmp, vp, cred, td); 2526 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva, 2527 &attrflag, &eof, NULL); 2528 if (attrflag) 2529 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2530 2531 if (!error) { 2532 /* 2533 * We are now either at end of the directory or have filled the 2534 * the block. 2535 */ 2536 if (eof) { 2537 NFSLOCKNODE(dnp); 2538 dnp->n_direofoffset = uiop->uio_offset; 2539 NFSUNLOCKNODE(dnp); 2540 } else { 2541 if (uiop->uio_resid > 0) 2542 printf("EEK! readdirplusrpc resid > 0\n"); 2543 ncl_dircookie_lock(dnp); 2544 NFSUNLOCKNODE(dnp); 2545 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2546 *cookiep = cookie; 2547 ncl_dircookie_unlock(dnp); 2548 } 2549 } else if (NFS_ISV4(vp)) { 2550 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2551 } 2552 return (error); 2553 } 2554 2555 /* 2556 * Silly rename. To make the NFS filesystem that is stateless look a little 2557 * more like the "ufs" a remove of an active vnode is translated to a rename 2558 * to a funny looking filename that is removed by nfs_inactive on the 2559 * nfsnode. There is the potential for another process on a different client 2560 * to create the same funny name between the nfs_lookitup() fails and the 2561 * nfs_rename() completes, but... 2562 */ 2563 static int 2564 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2565 { 2566 struct sillyrename *sp; 2567 struct nfsnode *np; 2568 int error; 2569 short pid; 2570 unsigned int lticks; 2571 2572 cache_purge(dvp); 2573 np = VTONFS(vp); 2574 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir")); 2575 sp = malloc(sizeof (struct sillyrename), 2576 M_NEWNFSREQ, M_WAITOK); 2577 sp->s_cred = crhold(cnp->cn_cred); 2578 sp->s_dvp = dvp; 2579 VREF(dvp); 2580 2581 /* 2582 * Fudge together a funny name. 2583 * Changing the format of the funny name to accommodate more 2584 * sillynames per directory. 2585 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2586 * CPU ticks since boot. 2587 */ 2588 pid = cnp->cn_thread->td_proc->p_pid; 2589 lticks = (unsigned int)ticks; 2590 for ( ; ; ) { 2591 sp->s_namlen = sprintf(sp->s_name, 2592 ".nfs.%08x.%04x4.4", lticks, 2593 pid); 2594 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2595 cnp->cn_thread, NULL)) 2596 break; 2597 lticks++; 2598 } 2599 error = nfs_renameit(dvp, vp, cnp, sp); 2600 if (error) 2601 goto bad; 2602 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2603 cnp->cn_thread, &np); 2604 np->n_sillyrename = sp; 2605 return (0); 2606 bad: 2607 vrele(sp->s_dvp); 2608 crfree(sp->s_cred); 2609 free(sp, M_NEWNFSREQ); 2610 return (error); 2611 } 2612 2613 /* 2614 * Look up a file name and optionally either update the file handle or 2615 * allocate an nfsnode, depending on the value of npp. 2616 * npp == NULL --> just do the lookup 2617 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2618 * handled too 2619 * *npp != NULL --> update the file handle in the vnode 2620 */ 2621 static int 2622 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred, 2623 struct thread *td, struct nfsnode **npp) 2624 { 2625 struct vnode *newvp = NULL, *vp; 2626 struct nfsnode *np, *dnp = VTONFS(dvp); 2627 struct nfsfh *nfhp, *onfhp; 2628 struct nfsvattr nfsva, dnfsva; 2629 struct componentname cn; 2630 int error = 0, attrflag, dattrflag; 2631 u_int hash; 2632 2633 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva, 2634 &nfhp, &attrflag, &dattrflag, NULL, 0); 2635 if (dattrflag) 2636 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2637 if (npp && !error) { 2638 if (*npp != NULL) { 2639 np = *npp; 2640 vp = NFSTOV(np); 2641 /* 2642 * For NFSv4, check to see if it is the same name and 2643 * replace the name, if it is different. 2644 */ 2645 if (np->n_v4 != NULL && nfsva.na_type == VREG && 2646 (np->n_v4->n4_namelen != len || 2647 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) || 2648 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen || 2649 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2650 dnp->n_fhp->nfh_len))) { 2651 #ifdef notdef 2652 { char nnn[100]; int nnnl; 2653 nnnl = (len < 100) ? len : 99; 2654 bcopy(name, nnn, nnnl); 2655 nnn[nnnl] = '\0'; 2656 printf("replace=%s\n",nnn); 2657 } 2658 #endif 2659 free(np->n_v4, M_NFSV4NODE); 2660 np->n_v4 = malloc( 2661 sizeof (struct nfsv4node) + 2662 dnp->n_fhp->nfh_len + len - 1, 2663 M_NFSV4NODE, M_WAITOK); 2664 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len; 2665 np->n_v4->n4_namelen = len; 2666 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2667 dnp->n_fhp->nfh_len); 2668 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len); 2669 } 2670 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, 2671 FNV1_32_INIT); 2672 onfhp = np->n_fhp; 2673 /* 2674 * Rehash node for new file handle. 2675 */ 2676 vfs_hash_rehash(vp, hash); 2677 np->n_fhp = nfhp; 2678 if (onfhp != NULL) 2679 free(onfhp, M_NFSFH); 2680 newvp = NFSTOV(np); 2681 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) { 2682 free(nfhp, M_NFSFH); 2683 VREF(dvp); 2684 newvp = dvp; 2685 } else { 2686 cn.cn_nameptr = name; 2687 cn.cn_namelen = len; 2688 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td, 2689 &np, NULL, LK_EXCLUSIVE); 2690 if (error) 2691 return (error); 2692 newvp = NFSTOV(np); 2693 } 2694 if (!attrflag && *npp == NULL) { 2695 if (newvp == dvp) 2696 vrele(newvp); 2697 else 2698 vput(newvp); 2699 return (ENOENT); 2700 } 2701 if (attrflag) 2702 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2703 0, 1); 2704 } 2705 if (npp && *npp == NULL) { 2706 if (error) { 2707 if (newvp) { 2708 if (newvp == dvp) 2709 vrele(newvp); 2710 else 2711 vput(newvp); 2712 } 2713 } else 2714 *npp = np; 2715 } 2716 if (error && NFS_ISV4(dvp)) 2717 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2718 return (error); 2719 } 2720 2721 /* 2722 * Nfs Version 3 and 4 commit rpc 2723 */ 2724 int 2725 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2726 struct thread *td) 2727 { 2728 struct nfsvattr nfsva; 2729 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2730 struct nfsnode *np; 2731 struct uio uio; 2732 int error, attrflag; 2733 2734 np = VTONFS(vp); 2735 error = EIO; 2736 attrflag = 0; 2737 if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) { 2738 uio.uio_offset = offset; 2739 uio.uio_resid = cnt; 2740 error = nfscl_doiods(vp, &uio, NULL, NULL, 2741 NFSV4OPEN_ACCESSWRITE, 1, cred, td); 2742 if (error != 0) { 2743 NFSLOCKNODE(np); 2744 np->n_flag &= ~NDSCOMMIT; 2745 NFSUNLOCKNODE(np); 2746 } 2747 } 2748 if (error != 0) { 2749 mtx_lock(&nmp->nm_mtx); 2750 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2751 mtx_unlock(&nmp->nm_mtx); 2752 return (0); 2753 } 2754 mtx_unlock(&nmp->nm_mtx); 2755 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva, 2756 &attrflag, NULL); 2757 } 2758 if (attrflag != 0) 2759 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 2760 0, 1); 2761 if (error != 0 && NFS_ISV4(vp)) 2762 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2763 return (error); 2764 } 2765 2766 /* 2767 * Strategy routine. 2768 * For async requests when nfsiod(s) are running, queue the request by 2769 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the 2770 * request. 2771 */ 2772 static int 2773 nfs_strategy(struct vop_strategy_args *ap) 2774 { 2775 struct buf *bp; 2776 struct vnode *vp; 2777 struct ucred *cr; 2778 2779 bp = ap->a_bp; 2780 vp = ap->a_vp; 2781 KASSERT(bp->b_vp == vp, ("missing b_getvp")); 2782 KASSERT(!(bp->b_flags & B_DONE), 2783 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2784 2785 if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno) 2786 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize / 2787 DEV_BSIZE); 2788 if (bp->b_iocmd == BIO_READ) 2789 cr = bp->b_rcred; 2790 else 2791 cr = bp->b_wcred; 2792 2793 /* 2794 * If the op is asynchronous and an i/o daemon is waiting 2795 * queue the request, wake it up and wait for completion 2796 * otherwise just do it ourselves. 2797 */ 2798 if ((bp->b_flags & B_ASYNC) == 0 || 2799 ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread)) 2800 (void) ncl_doio(vp, bp, cr, curthread, 1); 2801 return (0); 2802 } 2803 2804 /* 2805 * fsync vnode op. Just call ncl_flush() with commit == 1. 2806 */ 2807 /* ARGSUSED */ 2808 static int 2809 nfs_fsync(struct vop_fsync_args *ap) 2810 { 2811 2812 if (ap->a_vp->v_type != VREG) { 2813 /* 2814 * For NFS, metadata is changed synchronously on the server, 2815 * so there is nothing to flush. Also, ncl_flush() clears 2816 * the NMODIFIED flag and that shouldn't be done here for 2817 * directories. 2818 */ 2819 return (0); 2820 } 2821 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0)); 2822 } 2823 2824 /* 2825 * Flush all the blocks associated with a vnode. 2826 * Walk through the buffer pool and push any dirty pages 2827 * associated with the vnode. 2828 * If the called_from_renewthread argument is TRUE, it has been called 2829 * from the NFSv4 renew thread and, as such, cannot block indefinitely 2830 * waiting for a buffer write to complete. 2831 */ 2832 int 2833 ncl_flush(struct vnode *vp, int waitfor, struct thread *td, 2834 int commit, int called_from_renewthread) 2835 { 2836 struct nfsnode *np = VTONFS(vp); 2837 struct buf *bp; 2838 int i; 2839 struct buf *nbp; 2840 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2841 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2842 int passone = 1, trycnt = 0; 2843 u_quad_t off, endoff, toff; 2844 struct ucred* wcred = NULL; 2845 struct buf **bvec = NULL; 2846 struct bufobj *bo; 2847 #ifndef NFS_COMMITBVECSIZ 2848 #define NFS_COMMITBVECSIZ 20 2849 #endif 2850 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2851 u_int bvecsize = 0, bveccount; 2852 2853 if (called_from_renewthread != 0) 2854 slptimeo = hz; 2855 if (nmp->nm_flag & NFSMNT_INT) 2856 slpflag = PCATCH; 2857 if (!commit) 2858 passone = 0; 2859 bo = &vp->v_bufobj; 2860 /* 2861 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2862 * server, but has not been committed to stable storage on the server 2863 * yet. On the first pass, the byte range is worked out and the commit 2864 * rpc is done. On the second pass, ncl_writebp() is called to do the 2865 * job. 2866 */ 2867 again: 2868 off = (u_quad_t)-1; 2869 endoff = 0; 2870 bvecpos = 0; 2871 if (NFS_ISV34(vp) && commit) { 2872 if (bvec != NULL && bvec != bvec_on_stack) 2873 free(bvec, M_TEMP); 2874 /* 2875 * Count up how many buffers waiting for a commit. 2876 */ 2877 bveccount = 0; 2878 BO_LOCK(bo); 2879 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2880 if (!BUF_ISLOCKED(bp) && 2881 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2882 == (B_DELWRI | B_NEEDCOMMIT)) 2883 bveccount++; 2884 } 2885 /* 2886 * Allocate space to remember the list of bufs to commit. It is 2887 * important to use M_NOWAIT here to avoid a race with nfs_write. 2888 * If we can't get memory (for whatever reason), we will end up 2889 * committing the buffers one-by-one in the loop below. 2890 */ 2891 if (bveccount > NFS_COMMITBVECSIZ) { 2892 /* 2893 * Release the vnode interlock to avoid a lock 2894 * order reversal. 2895 */ 2896 BO_UNLOCK(bo); 2897 bvec = (struct buf **) 2898 malloc(bveccount * sizeof(struct buf *), 2899 M_TEMP, M_NOWAIT); 2900 BO_LOCK(bo); 2901 if (bvec == NULL) { 2902 bvec = bvec_on_stack; 2903 bvecsize = NFS_COMMITBVECSIZ; 2904 } else 2905 bvecsize = bveccount; 2906 } else { 2907 bvec = bvec_on_stack; 2908 bvecsize = NFS_COMMITBVECSIZ; 2909 } 2910 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2911 if (bvecpos >= bvecsize) 2912 break; 2913 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2914 nbp = TAILQ_NEXT(bp, b_bobufs); 2915 continue; 2916 } 2917 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2918 (B_DELWRI | B_NEEDCOMMIT)) { 2919 BUF_UNLOCK(bp); 2920 nbp = TAILQ_NEXT(bp, b_bobufs); 2921 continue; 2922 } 2923 BO_UNLOCK(bo); 2924 bremfree(bp); 2925 /* 2926 * Work out if all buffers are using the same cred 2927 * so we can deal with them all with one commit. 2928 * 2929 * NOTE: we are not clearing B_DONE here, so we have 2930 * to do it later on in this routine if we intend to 2931 * initiate I/O on the bp. 2932 * 2933 * Note: to avoid loopback deadlocks, we do not 2934 * assign b_runningbufspace. 2935 */ 2936 if (wcred == NULL) 2937 wcred = bp->b_wcred; 2938 else if (wcred != bp->b_wcred) 2939 wcred = NOCRED; 2940 vfs_busy_pages(bp, 1); 2941 2942 BO_LOCK(bo); 2943 /* 2944 * bp is protected by being locked, but nbp is not 2945 * and vfs_busy_pages() may sleep. We have to 2946 * recalculate nbp. 2947 */ 2948 nbp = TAILQ_NEXT(bp, b_bobufs); 2949 2950 /* 2951 * A list of these buffers is kept so that the 2952 * second loop knows which buffers have actually 2953 * been committed. This is necessary, since there 2954 * may be a race between the commit rpc and new 2955 * uncommitted writes on the file. 2956 */ 2957 bvec[bvecpos++] = bp; 2958 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2959 bp->b_dirtyoff; 2960 if (toff < off) 2961 off = toff; 2962 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 2963 if (toff > endoff) 2964 endoff = toff; 2965 } 2966 BO_UNLOCK(bo); 2967 } 2968 if (bvecpos > 0) { 2969 /* 2970 * Commit data on the server, as required. 2971 * If all bufs are using the same wcred, then use that with 2972 * one call for all of them, otherwise commit each one 2973 * separately. 2974 */ 2975 if (wcred != NOCRED) 2976 retv = ncl_commit(vp, off, (int)(endoff - off), 2977 wcred, td); 2978 else { 2979 retv = 0; 2980 for (i = 0; i < bvecpos; i++) { 2981 off_t off, size; 2982 bp = bvec[i]; 2983 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2984 bp->b_dirtyoff; 2985 size = (u_quad_t)(bp->b_dirtyend 2986 - bp->b_dirtyoff); 2987 retv = ncl_commit(vp, off, (int)size, 2988 bp->b_wcred, td); 2989 if (retv) break; 2990 } 2991 } 2992 2993 if (retv == NFSERR_STALEWRITEVERF) 2994 ncl_clearcommit(vp->v_mount); 2995 2996 /* 2997 * Now, either mark the blocks I/O done or mark the 2998 * blocks dirty, depending on whether the commit 2999 * succeeded. 3000 */ 3001 for (i = 0; i < bvecpos; i++) { 3002 bp = bvec[i]; 3003 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3004 if (retv) { 3005 /* 3006 * Error, leave B_DELWRI intact 3007 */ 3008 vfs_unbusy_pages(bp); 3009 brelse(bp); 3010 } else { 3011 /* 3012 * Success, remove B_DELWRI ( bundirty() ). 3013 * 3014 * b_dirtyoff/b_dirtyend seem to be NFS 3015 * specific. We should probably move that 3016 * into bundirty(). XXX 3017 */ 3018 bufobj_wref(bo); 3019 bp->b_flags |= B_ASYNC; 3020 bundirty(bp); 3021 bp->b_flags &= ~B_DONE; 3022 bp->b_ioflags &= ~BIO_ERROR; 3023 bp->b_dirtyoff = bp->b_dirtyend = 0; 3024 bufdone(bp); 3025 } 3026 } 3027 } 3028 3029 /* 3030 * Start/do any write(s) that are required. 3031 */ 3032 loop: 3033 BO_LOCK(bo); 3034 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3035 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3036 if (waitfor != MNT_WAIT || passone) 3037 continue; 3038 3039 error = BUF_TIMELOCK(bp, 3040 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 3041 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo); 3042 if (error == 0) { 3043 BUF_UNLOCK(bp); 3044 goto loop; 3045 } 3046 if (error == ENOLCK) { 3047 error = 0; 3048 goto loop; 3049 } 3050 if (called_from_renewthread != 0) { 3051 /* 3052 * Return EIO so the flush will be retried 3053 * later. 3054 */ 3055 error = EIO; 3056 goto done; 3057 } 3058 if (newnfs_sigintr(nmp, td)) { 3059 error = EINTR; 3060 goto done; 3061 } 3062 if (slpflag == PCATCH) { 3063 slpflag = 0; 3064 slptimeo = 2 * hz; 3065 } 3066 goto loop; 3067 } 3068 if ((bp->b_flags & B_DELWRI) == 0) 3069 panic("nfs_fsync: not dirty"); 3070 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3071 BUF_UNLOCK(bp); 3072 continue; 3073 } 3074 BO_UNLOCK(bo); 3075 bremfree(bp); 3076 bp->b_flags |= B_ASYNC; 3077 bwrite(bp); 3078 if (newnfs_sigintr(nmp, td)) { 3079 error = EINTR; 3080 goto done; 3081 } 3082 goto loop; 3083 } 3084 if (passone) { 3085 passone = 0; 3086 BO_UNLOCK(bo); 3087 goto again; 3088 } 3089 if (waitfor == MNT_WAIT) { 3090 while (bo->bo_numoutput) { 3091 error = bufobj_wwait(bo, slpflag, slptimeo); 3092 if (error) { 3093 BO_UNLOCK(bo); 3094 if (called_from_renewthread != 0) { 3095 /* 3096 * Return EIO so that the flush will be 3097 * retried later. 3098 */ 3099 error = EIO; 3100 goto done; 3101 } 3102 error = newnfs_sigintr(nmp, td); 3103 if (error) 3104 goto done; 3105 if (slpflag == PCATCH) { 3106 slpflag = 0; 3107 slptimeo = 2 * hz; 3108 } 3109 BO_LOCK(bo); 3110 } 3111 } 3112 if (bo->bo_dirty.bv_cnt != 0 && commit) { 3113 BO_UNLOCK(bo); 3114 goto loop; 3115 } 3116 /* 3117 * Wait for all the async IO requests to drain 3118 */ 3119 BO_UNLOCK(bo); 3120 NFSLOCKNODE(np); 3121 while (np->n_directio_asyncwr > 0) { 3122 np->n_flag |= NFSYNCWAIT; 3123 error = newnfs_msleep(td, &np->n_directio_asyncwr, 3124 &np->n_mtx, slpflag | (PRIBIO + 1), 3125 "nfsfsync", 0); 3126 if (error) { 3127 if (newnfs_sigintr(nmp, td)) { 3128 NFSUNLOCKNODE(np); 3129 error = EINTR; 3130 goto done; 3131 } 3132 } 3133 } 3134 NFSUNLOCKNODE(np); 3135 } else 3136 BO_UNLOCK(bo); 3137 if (NFSHASPNFS(nmp)) { 3138 nfscl_layoutcommit(vp, td); 3139 /* 3140 * Invalidate the attribute cache, since writes to a DS 3141 * won't update the size attribute. 3142 */ 3143 NFSLOCKNODE(np); 3144 np->n_attrstamp = 0; 3145 } else 3146 NFSLOCKNODE(np); 3147 if (np->n_flag & NWRITEERR) { 3148 error = np->n_error; 3149 np->n_flag &= ~NWRITEERR; 3150 } 3151 if (commit && bo->bo_dirty.bv_cnt == 0 && 3152 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) 3153 np->n_flag &= ~NMODIFIED; 3154 NFSUNLOCKNODE(np); 3155 done: 3156 if (bvec != NULL && bvec != bvec_on_stack) 3157 free(bvec, M_TEMP); 3158 if (error == 0 && commit != 0 && waitfor == MNT_WAIT && 3159 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 || 3160 np->n_directio_asyncwr != 0)) { 3161 if (trycnt++ < 5) { 3162 /* try, try again... */ 3163 passone = 1; 3164 wcred = NULL; 3165 bvec = NULL; 3166 bvecsize = 0; 3167 goto again; 3168 } 3169 vn_printf(vp, "ncl_flush failed"); 3170 error = called_from_renewthread != 0 ? EIO : EBUSY; 3171 } 3172 return (error); 3173 } 3174 3175 /* 3176 * NFS advisory byte-level locks. 3177 */ 3178 static int 3179 nfs_advlock(struct vop_advlock_args *ap) 3180 { 3181 struct vnode *vp = ap->a_vp; 3182 struct ucred *cred; 3183 struct nfsnode *np = VTONFS(ap->a_vp); 3184 struct proc *p = (struct proc *)ap->a_id; 3185 struct thread *td = curthread; /* XXX */ 3186 struct vattr va; 3187 int ret, error; 3188 u_quad_t size; 3189 struct nfsmount *nmp; 3190 3191 error = NFSVOPLOCK(vp, LK_SHARED); 3192 if (error != 0) 3193 return (EBADF); 3194 if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) { 3195 if (vp->v_type != VREG) { 3196 error = EINVAL; 3197 goto out; 3198 } 3199 if ((ap->a_flags & F_POSIX) != 0) 3200 cred = p->p_ucred; 3201 else 3202 cred = td->td_ucred; 3203 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 3204 if (VN_IS_DOOMED(vp)) { 3205 error = EBADF; 3206 goto out; 3207 } 3208 3209 /* 3210 * If this is unlocking a write locked region, flush and 3211 * commit them before unlocking. This is required by 3212 * RFC3530 Sec. 9.3.2. 3213 */ 3214 if (ap->a_op == F_UNLCK && 3215 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id, 3216 ap->a_flags)) 3217 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0); 3218 3219 /* 3220 * Mark NFS node as might have acquired a lock. 3221 * This is separate from NHASBEENLOCKED, because it must 3222 * be done before the nfsrpc_advlock() call, which might 3223 * add a nfscllock structure to the client state. 3224 * It is used to check for the case where a nfscllock 3225 * state structure cannot exist for the file. 3226 * Only done for "oneopenown" NFSv4.1/4.2 mounts. 3227 */ 3228 nmp = VFSTONFS(vp->v_mount); 3229 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp)) { 3230 NFSLOCKNODE(np); 3231 np->n_flag |= NMIGHTBELOCKED; 3232 NFSUNLOCKNODE(np); 3233 } 3234 3235 /* 3236 * Loop around doing the lock op, while a blocking lock 3237 * must wait for the lock op to succeed. 3238 */ 3239 do { 3240 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op, 3241 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags); 3242 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3243 ap->a_op == F_SETLK) { 3244 NFSVOPUNLOCK(vp); 3245 error = nfs_catnap(PZERO | PCATCH, ret, 3246 "ncladvl"); 3247 if (error) 3248 return (EINTR); 3249 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY); 3250 if (VN_IS_DOOMED(vp)) { 3251 error = EBADF; 3252 goto out; 3253 } 3254 } 3255 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3256 ap->a_op == F_SETLK); 3257 if (ret == NFSERR_DENIED) { 3258 error = EAGAIN; 3259 goto out; 3260 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) { 3261 error = ret; 3262 goto out; 3263 } else if (ret != 0) { 3264 error = EACCES; 3265 goto out; 3266 } 3267 3268 /* 3269 * Now, if we just got a lock, invalidate data in the buffer 3270 * cache, as required, so that the coherency conforms with 3271 * RFC3530 Sec. 9.3.2. 3272 */ 3273 if (ap->a_op == F_SETLK) { 3274 if ((np->n_flag & NMODIFIED) == 0) { 3275 np->n_attrstamp = 0; 3276 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3277 ret = VOP_GETATTR(vp, &va, cred); 3278 } 3279 if ((np->n_flag & NMODIFIED) || ret || 3280 np->n_change != va.va_filerev) { 3281 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1); 3282 np->n_attrstamp = 0; 3283 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3284 ret = VOP_GETATTR(vp, &va, cred); 3285 if (!ret) { 3286 np->n_mtime = va.va_mtime; 3287 np->n_change = va.va_filerev; 3288 } 3289 } 3290 /* Mark that a file lock has been acquired. */ 3291 NFSLOCKNODE(np); 3292 np->n_flag |= NHASBEENLOCKED; 3293 NFSUNLOCKNODE(np); 3294 } 3295 } else if (!NFS_ISV4(vp)) { 3296 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3297 size = VTONFS(vp)->n_size; 3298 NFSVOPUNLOCK(vp); 3299 error = lf_advlock(ap, &(vp->v_lockf), size); 3300 } else { 3301 if (nfs_advlock_p != NULL) 3302 error = nfs_advlock_p(ap); 3303 else { 3304 NFSVOPUNLOCK(vp); 3305 error = ENOLCK; 3306 } 3307 } 3308 if (error == 0 && ap->a_op == F_SETLK) { 3309 error = NFSVOPLOCK(vp, LK_SHARED); 3310 if (error == 0) { 3311 /* Mark that a file lock has been acquired. */ 3312 NFSLOCKNODE(np); 3313 np->n_flag |= NHASBEENLOCKED; 3314 NFSUNLOCKNODE(np); 3315 NFSVOPUNLOCK(vp); 3316 } 3317 } 3318 return (error); 3319 } else 3320 error = EOPNOTSUPP; 3321 out: 3322 NFSVOPUNLOCK(vp); 3323 return (error); 3324 } 3325 3326 /* 3327 * NFS advisory byte-level locks. 3328 */ 3329 static int 3330 nfs_advlockasync(struct vop_advlockasync_args *ap) 3331 { 3332 struct vnode *vp = ap->a_vp; 3333 u_quad_t size; 3334 int error; 3335 3336 if (NFS_ISV4(vp)) 3337 return (EOPNOTSUPP); 3338 error = NFSVOPLOCK(vp, LK_SHARED); 3339 if (error) 3340 return (error); 3341 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3342 size = VTONFS(vp)->n_size; 3343 NFSVOPUNLOCK(vp); 3344 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3345 } else { 3346 NFSVOPUNLOCK(vp); 3347 error = EOPNOTSUPP; 3348 } 3349 return (error); 3350 } 3351 3352 /* 3353 * Print out the contents of an nfsnode. 3354 */ 3355 static int 3356 nfs_print(struct vop_print_args *ap) 3357 { 3358 struct vnode *vp = ap->a_vp; 3359 struct nfsnode *np = VTONFS(vp); 3360 3361 printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid, 3362 (uintmax_t)np->n_vattr.na_fsid); 3363 if (vp->v_type == VFIFO) 3364 fifo_printinfo(vp); 3365 printf("\n"); 3366 return (0); 3367 } 3368 3369 /* 3370 * This is the "real" nfs::bwrite(struct buf*). 3371 * We set B_CACHE if this is a VMIO buffer. 3372 */ 3373 int 3374 ncl_writebp(struct buf *bp, int force __unused, struct thread *td) 3375 { 3376 int oldflags, rtval; 3377 3378 if (bp->b_flags & B_INVAL) { 3379 brelse(bp); 3380 return (0); 3381 } 3382 3383 oldflags = bp->b_flags; 3384 bp->b_flags |= B_CACHE; 3385 3386 /* 3387 * Undirty the bp. We will redirty it later if the I/O fails. 3388 */ 3389 bundirty(bp); 3390 bp->b_flags &= ~B_DONE; 3391 bp->b_ioflags &= ~BIO_ERROR; 3392 bp->b_iocmd = BIO_WRITE; 3393 3394 bufobj_wref(bp->b_bufobj); 3395 curthread->td_ru.ru_oublock++; 3396 3397 /* 3398 * Note: to avoid loopback deadlocks, we do not 3399 * assign b_runningbufspace. 3400 */ 3401 vfs_busy_pages(bp, 1); 3402 3403 BUF_KERNPROC(bp); 3404 bp->b_iooffset = dbtob(bp->b_blkno); 3405 bstrategy(bp); 3406 3407 if ((oldflags & B_ASYNC) != 0) 3408 return (0); 3409 3410 rtval = bufwait(bp); 3411 if (oldflags & B_DELWRI) 3412 reassignbuf(bp); 3413 brelse(bp); 3414 return (rtval); 3415 } 3416 3417 /* 3418 * nfs special file access vnode op. 3419 * Essentially just get vattr and then imitate iaccess() since the device is 3420 * local to the client. 3421 */ 3422 static int 3423 nfsspec_access(struct vop_access_args *ap) 3424 { 3425 struct vattr *vap; 3426 struct ucred *cred = ap->a_cred; 3427 struct vnode *vp = ap->a_vp; 3428 accmode_t accmode = ap->a_accmode; 3429 struct vattr vattr; 3430 int error; 3431 3432 /* 3433 * Disallow write attempts on filesystems mounted read-only; 3434 * unless the file is a socket, fifo, or a block or character 3435 * device resident on the filesystem. 3436 */ 3437 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3438 switch (vp->v_type) { 3439 case VREG: 3440 case VDIR: 3441 case VLNK: 3442 return (EROFS); 3443 default: 3444 break; 3445 } 3446 } 3447 vap = &vattr; 3448 error = VOP_GETATTR(vp, vap, cred); 3449 if (error) 3450 goto out; 3451 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3452 accmode, cred); 3453 out: 3454 return error; 3455 } 3456 3457 /* 3458 * Read wrapper for fifos. 3459 */ 3460 static int 3461 nfsfifo_read(struct vop_read_args *ap) 3462 { 3463 struct nfsnode *np = VTONFS(ap->a_vp); 3464 int error; 3465 3466 /* 3467 * Set access flag. 3468 */ 3469 NFSLOCKNODE(np); 3470 np->n_flag |= NACC; 3471 vfs_timestamp(&np->n_atim); 3472 NFSUNLOCKNODE(np); 3473 error = fifo_specops.vop_read(ap); 3474 return error; 3475 } 3476 3477 /* 3478 * Write wrapper for fifos. 3479 */ 3480 static int 3481 nfsfifo_write(struct vop_write_args *ap) 3482 { 3483 struct nfsnode *np = VTONFS(ap->a_vp); 3484 3485 /* 3486 * Set update flag. 3487 */ 3488 NFSLOCKNODE(np); 3489 np->n_flag |= NUPD; 3490 vfs_timestamp(&np->n_mtim); 3491 NFSUNLOCKNODE(np); 3492 return(fifo_specops.vop_write(ap)); 3493 } 3494 3495 /* 3496 * Close wrapper for fifos. 3497 * 3498 * Update the times on the nfsnode then do fifo close. 3499 */ 3500 static int 3501 nfsfifo_close(struct vop_close_args *ap) 3502 { 3503 struct vnode *vp = ap->a_vp; 3504 struct nfsnode *np = VTONFS(vp); 3505 struct vattr vattr; 3506 struct timespec ts; 3507 3508 NFSLOCKNODE(np); 3509 if (np->n_flag & (NACC | NUPD)) { 3510 vfs_timestamp(&ts); 3511 if (np->n_flag & NACC) 3512 np->n_atim = ts; 3513 if (np->n_flag & NUPD) 3514 np->n_mtim = ts; 3515 np->n_flag |= NCHG; 3516 if (vrefcnt(vp) == 1 && 3517 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3518 VATTR_NULL(&vattr); 3519 if (np->n_flag & NACC) 3520 vattr.va_atime = np->n_atim; 3521 if (np->n_flag & NUPD) 3522 vattr.va_mtime = np->n_mtim; 3523 NFSUNLOCKNODE(np); 3524 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3525 goto out; 3526 } 3527 } 3528 NFSUNLOCKNODE(np); 3529 out: 3530 return (fifo_specops.vop_close(ap)); 3531 } 3532 3533 /* 3534 * Just call ncl_writebp() with the force argument set to 1. 3535 * 3536 * NOTE: B_DONE may or may not be set in a_bp on call. 3537 */ 3538 static int 3539 nfs_bwrite(struct buf *bp) 3540 { 3541 3542 return (ncl_writebp(bp, 1, curthread)); 3543 } 3544 3545 struct buf_ops buf_ops_newnfs = { 3546 .bop_name = "buf_ops_nfs", 3547 .bop_write = nfs_bwrite, 3548 .bop_strategy = bufstrategy, 3549 .bop_sync = bufsync, 3550 .bop_bdflush = bufbdflush, 3551 }; 3552 3553 static int 3554 nfs_getacl(struct vop_getacl_args *ap) 3555 { 3556 int error; 3557 3558 if (ap->a_type != ACL_TYPE_NFS4) 3559 return (EOPNOTSUPP); 3560 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3561 NULL); 3562 if (error > NFSERR_STALE) { 3563 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3564 error = EPERM; 3565 } 3566 return (error); 3567 } 3568 3569 static int 3570 nfs_setacl(struct vop_setacl_args *ap) 3571 { 3572 int error; 3573 3574 if (ap->a_type != ACL_TYPE_NFS4) 3575 return (EOPNOTSUPP); 3576 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3577 NULL); 3578 if (error > NFSERR_STALE) { 3579 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3580 error = EPERM; 3581 } 3582 return (error); 3583 } 3584 3585 /* 3586 * VOP_ADVISE for NFS. 3587 * Just return 0 for any errors, since it is just a hint. 3588 */ 3589 static int 3590 nfs_advise(struct vop_advise_args *ap) 3591 { 3592 struct thread *td = curthread; 3593 struct nfsmount *nmp; 3594 uint64_t len; 3595 int error; 3596 3597 /* 3598 * First do vop_stdadvise() to handle the buffer cache. 3599 */ 3600 error = vop_stdadvise(ap); 3601 if (error != 0) 3602 return (error); 3603 if (ap->a_start < 0 || ap->a_end < 0) 3604 return (0); 3605 if (ap->a_end == OFF_MAX) 3606 len = 0; 3607 else if (ap->a_end < ap->a_start) 3608 return (0); 3609 else 3610 len = ap->a_end - ap->a_start + 1; 3611 nmp = VFSTONFS(ap->a_vp->v_mount); 3612 mtx_lock(&nmp->nm_mtx); 3613 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3614 (NFSHASPNFS(nmp) && (nmp->nm_privflag & NFSMNTP_IOADVISETHRUMDS) == 3615 0) || (nmp->nm_privflag & NFSMNTP_NOADVISE) != 0) { 3616 mtx_unlock(&nmp->nm_mtx); 3617 return (0); 3618 } 3619 mtx_unlock(&nmp->nm_mtx); 3620 error = nfsrpc_advise(ap->a_vp, ap->a_start, len, ap->a_advice, 3621 td->td_ucred, td); 3622 if (error == NFSERR_NOTSUPP) { 3623 mtx_lock(&nmp->nm_mtx); 3624 nmp->nm_privflag |= NFSMNTP_NOADVISE; 3625 mtx_unlock(&nmp->nm_mtx); 3626 } 3627 return (0); 3628 } 3629 3630 /* 3631 * nfs allocate call 3632 */ 3633 static int 3634 nfs_allocate(struct vop_allocate_args *ap) 3635 { 3636 struct vnode *vp = ap->a_vp; 3637 struct thread *td = curthread; 3638 struct nfsvattr nfsva; 3639 struct nfsmount *nmp; 3640 int attrflag, error, ret; 3641 3642 attrflag = 0; 3643 nmp = VFSTONFS(vp->v_mount); 3644 mtx_lock(&nmp->nm_mtx); 3645 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION && 3646 (nmp->nm_privflag & NFSMNTP_NOALLOCATE) == 0) { 3647 mtx_unlock(&nmp->nm_mtx); 3648 /* 3649 * Flush first to ensure that the allocate adds to the 3650 * file's allocation on the server. 3651 */ 3652 error = ncl_flush(vp, MNT_WAIT, td, 1, 0); 3653 if (error == 0) 3654 error = nfsrpc_allocate(vp, *ap->a_offset, *ap->a_len, 3655 &nfsva, &attrflag, td->td_ucred, td, NULL); 3656 if (error == 0) { 3657 *ap->a_offset += *ap->a_len; 3658 *ap->a_len = 0; 3659 } else if (error == NFSERR_NOTSUPP) { 3660 mtx_lock(&nmp->nm_mtx); 3661 nmp->nm_privflag |= NFSMNTP_NOALLOCATE; 3662 mtx_unlock(&nmp->nm_mtx); 3663 } 3664 } else { 3665 mtx_unlock(&nmp->nm_mtx); 3666 error = EIO; 3667 } 3668 /* 3669 * If the NFS server cannot perform the Allocate operation, just call 3670 * vop_stdallocate() to perform it. 3671 */ 3672 if (error != 0) 3673 error = vop_stdallocate(ap); 3674 if (attrflag != 0) { 3675 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 3676 if (error == 0 && ret != 0) 3677 error = ret; 3678 } 3679 if (error != 0) 3680 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 3681 return (error); 3682 } 3683 3684 /* 3685 * nfs copy_file_range call 3686 */ 3687 static int 3688 nfs_copy_file_range(struct vop_copy_file_range_args *ap) 3689 { 3690 struct vnode *invp = ap->a_invp; 3691 struct vnode *outvp = ap->a_outvp; 3692 struct mount *mp; 3693 struct nfsvattr innfsva, outnfsva; 3694 struct vattr *vap; 3695 struct uio io; 3696 struct nfsmount *nmp; 3697 size_t len, len2; 3698 int error, inattrflag, outattrflag, ret, ret2; 3699 off_t inoff, outoff; 3700 bool consecutive, must_commit, tryoutcred; 3701 3702 ret = ret2 = 0; 3703 nmp = VFSTONFS(invp->v_mount); 3704 mtx_lock(&nmp->nm_mtx); 3705 /* NFSv4.2 Copy is not permitted for infile == outfile. */ 3706 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3707 (nmp->nm_privflag & NFSMNTP_NOCOPY) != 0 || invp == outvp) { 3708 mtx_unlock(&nmp->nm_mtx); 3709 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 3710 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, 3711 ap->a_incred, ap->a_outcred, ap->a_fsizetd); 3712 return (error); 3713 } 3714 mtx_unlock(&nmp->nm_mtx); 3715 3716 /* Lock both vnodes, avoiding risk of deadlock. */ 3717 do { 3718 mp = NULL; 3719 error = vn_start_write(outvp, &mp, V_WAIT); 3720 if (error == 0) { 3721 error = vn_lock(outvp, LK_EXCLUSIVE); 3722 if (error == 0) { 3723 error = vn_lock(invp, LK_SHARED | LK_NOWAIT); 3724 if (error == 0) 3725 break; 3726 VOP_UNLOCK(outvp); 3727 if (mp != NULL) 3728 vn_finished_write(mp); 3729 mp = NULL; 3730 error = vn_lock(invp, LK_SHARED); 3731 if (error == 0) 3732 VOP_UNLOCK(invp); 3733 } 3734 } 3735 if (mp != NULL) 3736 vn_finished_write(mp); 3737 } while (error == 0); 3738 if (error != 0) 3739 return (error); 3740 3741 /* 3742 * Do the vn_rlimit_fsize() check. Should this be above the VOP layer? 3743 */ 3744 io.uio_offset = *ap->a_outoffp; 3745 io.uio_resid = *ap->a_lenp; 3746 error = vn_rlimit_fsize(outvp, &io, ap->a_fsizetd); 3747 3748 /* 3749 * Flush the input file so that the data is up to date before 3750 * the copy. Flush writes for the output file so that they 3751 * do not overwrite the data copied to the output file by the Copy. 3752 * Set the commit argument for both flushes so that the data is on 3753 * stable storage before the Copy RPC. This is done in case the 3754 * server reboots during the Copy and needs to be redone. 3755 */ 3756 if (error == 0) 3757 error = ncl_flush(invp, MNT_WAIT, curthread, 1, 0); 3758 if (error == 0) 3759 error = ncl_flush(outvp, MNT_WAIT, curthread, 1, 0); 3760 3761 /* Do the actual NFSv4.2 RPC. */ 3762 len = *ap->a_lenp; 3763 mtx_lock(&nmp->nm_mtx); 3764 if ((nmp->nm_privflag & NFSMNTP_NOCONSECUTIVE) == 0) 3765 consecutive = true; 3766 else 3767 consecutive = false; 3768 mtx_unlock(&nmp->nm_mtx); 3769 inoff = *ap->a_inoffp; 3770 outoff = *ap->a_outoffp; 3771 tryoutcred = true; 3772 must_commit = false; 3773 if (error == 0) { 3774 vap = &VTONFS(invp)->n_vattr.na_vattr; 3775 error = VOP_GETATTR(invp, vap, ap->a_incred); 3776 if (error == 0) { 3777 /* 3778 * Clip "len" at va_size so that RFC compliant servers 3779 * will not reply NFSERR_INVAL. 3780 * Setting "len == 0" for the RPC would be preferred, 3781 * but some Linux servers do not support that. 3782 */ 3783 if (inoff >= vap->va_size) 3784 *ap->a_lenp = len = 0; 3785 else if (inoff + len > vap->va_size) 3786 *ap->a_lenp = len = vap->va_size - inoff; 3787 } else 3788 error = 0; 3789 } 3790 3791 /* 3792 * len will be set to 0 upon a successful Copy RPC. 3793 * As such, this only loops when the Copy RPC needs to be retried. 3794 */ 3795 while (len > 0 && error == 0) { 3796 inattrflag = outattrflag = 0; 3797 len2 = len; 3798 if (tryoutcred) 3799 error = nfsrpc_copy_file_range(invp, ap->a_inoffp, 3800 outvp, ap->a_outoffp, &len2, ap->a_flags, 3801 &inattrflag, &innfsva, &outattrflag, &outnfsva, 3802 ap->a_outcred, consecutive, &must_commit); 3803 else 3804 error = nfsrpc_copy_file_range(invp, ap->a_inoffp, 3805 outvp, ap->a_outoffp, &len2, ap->a_flags, 3806 &inattrflag, &innfsva, &outattrflag, &outnfsva, 3807 ap->a_incred, consecutive, &must_commit); 3808 if (inattrflag != 0) 3809 ret = nfscl_loadattrcache(&invp, &innfsva, NULL, NULL, 3810 0, 1); 3811 if (outattrflag != 0) 3812 ret2 = nfscl_loadattrcache(&outvp, &outnfsva, NULL, 3813 NULL, 1, 1); 3814 if (error == 0) { 3815 if (consecutive == false) { 3816 if (len2 == len) { 3817 mtx_lock(&nmp->nm_mtx); 3818 nmp->nm_privflag |= 3819 NFSMNTP_NOCONSECUTIVE; 3820 mtx_unlock(&nmp->nm_mtx); 3821 } else 3822 error = NFSERR_OFFLOADNOREQS; 3823 } 3824 *ap->a_lenp = len2; 3825 len = 0; 3826 if (len2 > 0 && must_commit && error == 0) 3827 error = ncl_commit(outvp, outoff, *ap->a_lenp, 3828 ap->a_outcred, curthread); 3829 if (error == 0 && ret != 0) 3830 error = ret; 3831 if (error == 0 && ret2 != 0) 3832 error = ret2; 3833 } else if (error == NFSERR_OFFLOADNOREQS && consecutive) { 3834 /* 3835 * Try consecutive == false, which is ok only if all 3836 * bytes are copied. 3837 * If only some bytes were copied when consecutive 3838 * is false, there is no way to know which bytes 3839 * still need to be written. 3840 */ 3841 consecutive = false; 3842 error = 0; 3843 } else if (error == NFSERR_ACCES && tryoutcred) { 3844 /* Try again with incred. */ 3845 tryoutcred = false; 3846 error = 0; 3847 } 3848 if (error == NFSERR_STALEWRITEVERF) { 3849 /* 3850 * Server rebooted, so do it all again. 3851 */ 3852 *ap->a_inoffp = inoff; 3853 *ap->a_outoffp = outoff; 3854 len = *ap->a_lenp; 3855 must_commit = false; 3856 error = 0; 3857 } 3858 } 3859 VOP_UNLOCK(invp); 3860 VOP_UNLOCK(outvp); 3861 if (mp != NULL) 3862 vn_finished_write(mp); 3863 if (error == NFSERR_NOTSUPP || error == NFSERR_OFFLOADNOREQS || 3864 error == NFSERR_ACCES) { 3865 /* 3866 * Unlike the NFSv4.2 Copy, vn_generic_copy_file_range() can 3867 * use a_incred for the read and a_outcred for the write, so 3868 * try this for NFSERR_ACCES failures for the Copy. 3869 * For NFSERR_NOTSUPP and NFSERR_OFFLOADNOREQS, the Copy can 3870 * never succeed, so disable it. 3871 */ 3872 if (error != NFSERR_ACCES) { 3873 /* Can never do Copy on this mount. */ 3874 mtx_lock(&nmp->nm_mtx); 3875 nmp->nm_privflag |= NFSMNTP_NOCOPY; 3876 mtx_unlock(&nmp->nm_mtx); 3877 } 3878 *ap->a_inoffp = inoff; 3879 *ap->a_outoffp = outoff; 3880 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 3881 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, 3882 ap->a_incred, ap->a_outcred, ap->a_fsizetd); 3883 } else if (error != 0) 3884 *ap->a_lenp = 0; 3885 3886 if (error != 0) 3887 error = nfscl_maperr(curthread, error, (uid_t)0, (gid_t)0); 3888 return (error); 3889 } 3890 3891 /* 3892 * nfs ioctl call 3893 */ 3894 static int 3895 nfs_ioctl(struct vop_ioctl_args *ap) 3896 { 3897 struct vnode *vp = ap->a_vp; 3898 struct nfsvattr nfsva; 3899 struct nfsmount *nmp; 3900 int attrflag, content, error, ret; 3901 bool eof = false; /* shut up compiler. */ 3902 3903 if (vp->v_type != VREG) 3904 return (ENOTTY); 3905 nmp = VFSTONFS(vp->v_mount); 3906 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) { 3907 error = vop_stdioctl(ap); 3908 return (error); 3909 } 3910 3911 /* Do the actual NFSv4.2 RPC. */ 3912 switch (ap->a_command) { 3913 case FIOSEEKDATA: 3914 content = NFSV4CONTENT_DATA; 3915 break; 3916 case FIOSEEKHOLE: 3917 content = NFSV4CONTENT_HOLE; 3918 break; 3919 default: 3920 return (ENOTTY); 3921 } 3922 3923 error = vn_lock(vp, LK_SHARED); 3924 if (error != 0) 3925 return (EBADF); 3926 attrflag = 0; 3927 if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size) 3928 error = ENXIO; 3929 else { 3930 /* 3931 * Flush all writes, so that the server is up to date. 3932 * Although a Commit is not required, the commit argument 3933 * is set so that, for a pNFS File/Flexible File Layout 3934 * server, the LayoutCommit will be done to ensure the file 3935 * size is up to date on the Metadata Server. 3936 */ 3937 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0); 3938 if (error == 0) 3939 error = nfsrpc_seek(vp, (off_t *)ap->a_data, &eof, 3940 content, ap->a_cred, &nfsva, &attrflag); 3941 /* If at eof for FIOSEEKDATA, return ENXIO. */ 3942 if (eof && error == 0 && content == NFSV4CONTENT_DATA) 3943 error = ENXIO; 3944 } 3945 if (attrflag != 0) { 3946 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 3947 if (error == 0 && ret != 0) 3948 error = ret; 3949 } 3950 NFSVOPUNLOCK(vp); 3951 3952 if (error != 0) 3953 error = ENXIO; 3954 return (error); 3955 } 3956 3957 /* 3958 * nfs getextattr call 3959 */ 3960 static int 3961 nfs_getextattr(struct vop_getextattr_args *ap) 3962 { 3963 struct vnode *vp = ap->a_vp; 3964 struct nfsmount *nmp; 3965 struct ucred *cred; 3966 struct thread *td = ap->a_td; 3967 struct nfsvattr nfsva; 3968 ssize_t len; 3969 int attrflag, error, ret; 3970 3971 nmp = VFSTONFS(vp->v_mount); 3972 mtx_lock(&nmp->nm_mtx); 3973 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3974 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 3975 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 3976 mtx_unlock(&nmp->nm_mtx); 3977 return (EOPNOTSUPP); 3978 } 3979 mtx_unlock(&nmp->nm_mtx); 3980 3981 cred = ap->a_cred; 3982 if (cred == NULL) 3983 cred = td->td_ucred; 3984 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 3985 attrflag = 0; 3986 error = nfsrpc_getextattr(vp, ap->a_name, ap->a_uio, &len, &nfsva, 3987 &attrflag, cred, td); 3988 if (attrflag != 0) { 3989 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 3990 if (error == 0 && ret != 0) 3991 error = ret; 3992 } 3993 if (error == 0 && ap->a_size != NULL) 3994 *ap->a_size = len; 3995 3996 switch (error) { 3997 case NFSERR_NOTSUPP: 3998 case NFSERR_OPILLEGAL: 3999 mtx_lock(&nmp->nm_mtx); 4000 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4001 mtx_unlock(&nmp->nm_mtx); 4002 error = EOPNOTSUPP; 4003 break; 4004 case NFSERR_NOXATTR: 4005 case NFSERR_XATTR2BIG: 4006 error = ENOATTR; 4007 break; 4008 default: 4009 error = nfscl_maperr(td, error, 0, 0); 4010 break; 4011 } 4012 return (error); 4013 } 4014 4015 /* 4016 * nfs setextattr call 4017 */ 4018 static int 4019 nfs_setextattr(struct vop_setextattr_args *ap) 4020 { 4021 struct vnode *vp = ap->a_vp; 4022 struct nfsmount *nmp; 4023 struct ucred *cred; 4024 struct thread *td = ap->a_td; 4025 struct nfsvattr nfsva; 4026 int attrflag, error, ret; 4027 4028 nmp = VFSTONFS(vp->v_mount); 4029 mtx_lock(&nmp->nm_mtx); 4030 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4031 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4032 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4033 mtx_unlock(&nmp->nm_mtx); 4034 return (EOPNOTSUPP); 4035 } 4036 mtx_unlock(&nmp->nm_mtx); 4037 4038 if (ap->a_uio->uio_resid < 0) 4039 return (EINVAL); 4040 cred = ap->a_cred; 4041 if (cred == NULL) 4042 cred = td->td_ucred; 4043 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4044 attrflag = 0; 4045 error = nfsrpc_setextattr(vp, ap->a_name, ap->a_uio, &nfsva, 4046 &attrflag, cred, td); 4047 if (attrflag != 0) { 4048 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4049 if (error == 0 && ret != 0) 4050 error = ret; 4051 } 4052 4053 switch (error) { 4054 case NFSERR_NOTSUPP: 4055 case NFSERR_OPILLEGAL: 4056 mtx_lock(&nmp->nm_mtx); 4057 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4058 mtx_unlock(&nmp->nm_mtx); 4059 error = EOPNOTSUPP; 4060 break; 4061 case NFSERR_NOXATTR: 4062 case NFSERR_XATTR2BIG: 4063 error = ENOATTR; 4064 break; 4065 default: 4066 error = nfscl_maperr(td, error, 0, 0); 4067 break; 4068 } 4069 return (error); 4070 } 4071 4072 /* 4073 * nfs listextattr call 4074 */ 4075 static int 4076 nfs_listextattr(struct vop_listextattr_args *ap) 4077 { 4078 struct vnode *vp = ap->a_vp; 4079 struct nfsmount *nmp; 4080 struct ucred *cred; 4081 struct thread *td = ap->a_td; 4082 struct nfsvattr nfsva; 4083 size_t len, len2; 4084 uint64_t cookie; 4085 int attrflag, error, ret; 4086 bool eof; 4087 4088 nmp = VFSTONFS(vp->v_mount); 4089 mtx_lock(&nmp->nm_mtx); 4090 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4091 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4092 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4093 mtx_unlock(&nmp->nm_mtx); 4094 return (EOPNOTSUPP); 4095 } 4096 mtx_unlock(&nmp->nm_mtx); 4097 4098 cred = ap->a_cred; 4099 if (cred == NULL) 4100 cred = td->td_ucred; 4101 4102 /* Loop around doing List Extended Attribute RPCs. */ 4103 eof = false; 4104 cookie = 0; 4105 len2 = 0; 4106 error = 0; 4107 while (!eof && error == 0) { 4108 len = nmp->nm_rsize; 4109 attrflag = 0; 4110 error = nfsrpc_listextattr(vp, &cookie, ap->a_uio, &len, &eof, 4111 &nfsva, &attrflag, cred, td); 4112 if (attrflag != 0) { 4113 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 4114 1); 4115 if (error == 0 && ret != 0) 4116 error = ret; 4117 } 4118 if (error == 0) { 4119 len2 += len; 4120 if (len2 > SSIZE_MAX) 4121 error = ENOATTR; 4122 } 4123 } 4124 if (error == 0 && ap->a_size != NULL) 4125 *ap->a_size = len2; 4126 4127 switch (error) { 4128 case NFSERR_NOTSUPP: 4129 case NFSERR_OPILLEGAL: 4130 mtx_lock(&nmp->nm_mtx); 4131 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4132 mtx_unlock(&nmp->nm_mtx); 4133 error = EOPNOTSUPP; 4134 break; 4135 case NFSERR_NOXATTR: 4136 case NFSERR_XATTR2BIG: 4137 error = ENOATTR; 4138 break; 4139 default: 4140 error = nfscl_maperr(td, error, 0, 0); 4141 break; 4142 } 4143 return (error); 4144 } 4145 4146 /* 4147 * nfs setextattr call 4148 */ 4149 static int 4150 nfs_deleteextattr(struct vop_deleteextattr_args *ap) 4151 { 4152 struct vnode *vp = ap->a_vp; 4153 struct nfsmount *nmp; 4154 struct nfsvattr nfsva; 4155 int attrflag, error, ret; 4156 4157 nmp = VFSTONFS(vp->v_mount); 4158 mtx_lock(&nmp->nm_mtx); 4159 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4160 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4161 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4162 mtx_unlock(&nmp->nm_mtx); 4163 return (EOPNOTSUPP); 4164 } 4165 mtx_unlock(&nmp->nm_mtx); 4166 4167 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4168 attrflag = 0; 4169 error = nfsrpc_rmextattr(vp, ap->a_name, &nfsva, &attrflag, ap->a_cred, 4170 ap->a_td); 4171 if (attrflag != 0) { 4172 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4173 if (error == 0 && ret != 0) 4174 error = ret; 4175 } 4176 4177 switch (error) { 4178 case NFSERR_NOTSUPP: 4179 case NFSERR_OPILLEGAL: 4180 mtx_lock(&nmp->nm_mtx); 4181 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4182 mtx_unlock(&nmp->nm_mtx); 4183 error = EOPNOTSUPP; 4184 break; 4185 case NFSERR_NOXATTR: 4186 case NFSERR_XATTR2BIG: 4187 error = ENOATTR; 4188 break; 4189 default: 4190 error = nfscl_maperr(ap->a_td, error, 0, 0); 4191 break; 4192 } 4193 return (error); 4194 } 4195 4196 /* 4197 * Return POSIX pathconf information applicable to nfs filesystems. 4198 */ 4199 static int 4200 nfs_pathconf(struct vop_pathconf_args *ap) 4201 { 4202 struct nfsv3_pathconf pc; 4203 struct nfsvattr nfsva; 4204 struct vnode *vp = ap->a_vp; 4205 struct nfsmount *nmp; 4206 struct thread *td = curthread; 4207 off_t off; 4208 bool eof; 4209 int attrflag, error; 4210 4211 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX || 4212 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED || 4213 ap->a_name == _PC_NO_TRUNC)) || 4214 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) { 4215 /* 4216 * Since only the above 4 a_names are returned by the NFSv3 4217 * Pathconf RPC, there is no point in doing it for others. 4218 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can 4219 * be used for _PC_NFS4_ACL as well. 4220 */ 4221 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva, 4222 &attrflag, NULL); 4223 if (attrflag != 0) 4224 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 4225 1); 4226 if (error != 0) 4227 return (error); 4228 } else { 4229 /* 4230 * For NFSv2 (or NFSv3 when not one of the above 4 a_names), 4231 * just fake them. 4232 */ 4233 pc.pc_linkmax = NFS_LINK_MAX; 4234 pc.pc_namemax = NFS_MAXNAMLEN; 4235 pc.pc_notrunc = 1; 4236 pc.pc_chownrestricted = 1; 4237 pc.pc_caseinsensitive = 0; 4238 pc.pc_casepreserving = 1; 4239 error = 0; 4240 } 4241 switch (ap->a_name) { 4242 case _PC_LINK_MAX: 4243 #ifdef _LP64 4244 *ap->a_retval = pc.pc_linkmax; 4245 #else 4246 *ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax); 4247 #endif 4248 break; 4249 case _PC_NAME_MAX: 4250 *ap->a_retval = pc.pc_namemax; 4251 break; 4252 case _PC_PIPE_BUF: 4253 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 4254 *ap->a_retval = PIPE_BUF; 4255 else 4256 error = EINVAL; 4257 break; 4258 case _PC_CHOWN_RESTRICTED: 4259 *ap->a_retval = pc.pc_chownrestricted; 4260 break; 4261 case _PC_NO_TRUNC: 4262 *ap->a_retval = pc.pc_notrunc; 4263 break; 4264 case _PC_ACL_NFS4: 4265 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 && 4266 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL)) 4267 *ap->a_retval = 1; 4268 else 4269 *ap->a_retval = 0; 4270 break; 4271 case _PC_ACL_PATH_MAX: 4272 if (NFS_ISV4(vp)) 4273 *ap->a_retval = ACL_MAX_ENTRIES; 4274 else 4275 *ap->a_retval = 3; 4276 break; 4277 case _PC_PRIO_IO: 4278 *ap->a_retval = 0; 4279 break; 4280 case _PC_SYNC_IO: 4281 *ap->a_retval = 0; 4282 break; 4283 case _PC_ALLOC_SIZE_MIN: 4284 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize; 4285 break; 4286 case _PC_FILESIZEBITS: 4287 if (NFS_ISV34(vp)) 4288 *ap->a_retval = 64; 4289 else 4290 *ap->a_retval = 32; 4291 break; 4292 case _PC_REC_INCR_XFER_SIZE: 4293 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4294 break; 4295 case _PC_REC_MAX_XFER_SIZE: 4296 *ap->a_retval = -1; /* means ``unlimited'' */ 4297 break; 4298 case _PC_REC_MIN_XFER_SIZE: 4299 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4300 break; 4301 case _PC_REC_XFER_ALIGN: 4302 *ap->a_retval = PAGE_SIZE; 4303 break; 4304 case _PC_SYMLINK_MAX: 4305 *ap->a_retval = NFS_MAXPATHLEN; 4306 break; 4307 case _PC_MIN_HOLE_SIZE: 4308 /* Only some NFSv4.2 servers support Seek for Holes. */ 4309 *ap->a_retval = 0; 4310 nmp = VFSTONFS(vp->v_mount); 4311 if (NFS_ISV4(vp) && nmp->nm_minorvers == NFSV42_MINORVERSION) { 4312 /* 4313 * NFSv4.2 doesn't have an attribute for hole size, 4314 * so all we can do is see if the Seek operation is 4315 * supported and then use f_iosize as a "best guess". 4316 */ 4317 mtx_lock(&nmp->nm_mtx); 4318 if ((nmp->nm_privflag & NFSMNTP_SEEKTESTED) == 0) { 4319 mtx_unlock(&nmp->nm_mtx); 4320 off = 0; 4321 attrflag = 0; 4322 error = nfsrpc_seek(vp, &off, &eof, 4323 NFSV4CONTENT_HOLE, td->td_ucred, &nfsva, 4324 &attrflag); 4325 if (attrflag != 0) 4326 nfscl_loadattrcache(&vp, &nfsva, 4327 NULL, NULL, 0, 1); 4328 mtx_lock(&nmp->nm_mtx); 4329 if (error == NFSERR_NOTSUPP) 4330 nmp->nm_privflag |= NFSMNTP_SEEKTESTED; 4331 else 4332 nmp->nm_privflag |= NFSMNTP_SEEKTESTED | 4333 NFSMNTP_SEEK; 4334 error = 0; 4335 } 4336 if ((nmp->nm_privflag & NFSMNTP_SEEK) != 0) 4337 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4338 mtx_unlock(&nmp->nm_mtx); 4339 } 4340 break; 4341 4342 default: 4343 error = vop_stdpathconf(ap); 4344 break; 4345 } 4346 return (error); 4347 } 4348