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 /* 39 * vnode op calls for Sun NFS version 2, 3 and 4 40 */ 41 42 #include "opt_inet.h" 43 44 #include <sys/param.h> 45 #include <sys/kernel.h> 46 #include <sys/systm.h> 47 #include <sys/resourcevar.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 #include <sys/bio.h> 51 #include <sys/buf.h> 52 #include <sys/extattr.h> 53 #include <sys/filio.h> 54 #include <sys/jail.h> 55 #include <sys/malloc.h> 56 #include <sys/mbuf.h> 57 #include <sys/namei.h> 58 #include <sys/socket.h> 59 #include <sys/vnode.h> 60 #include <sys/dirent.h> 61 #include <sys/fcntl.h> 62 #include <sys/lockf.h> 63 #include <sys/stat.h> 64 #include <sys/sysctl.h> 65 #include <sys/signalvar.h> 66 67 #include <vm/vm.h> 68 #include <vm/vm_extern.h> 69 #include <vm/vm_object.h> 70 #include <vm/vnode_pager.h> 71 72 #include <fs/nfs/nfsport.h> 73 #include <fs/nfsclient/nfsnode.h> 74 #include <fs/nfsclient/nfsmount.h> 75 #include <fs/nfsclient/nfs.h> 76 #include <fs/nfsclient/nfs_kdtrace.h> 77 78 #include <net/if.h> 79 #include <netinet/in.h> 80 #include <netinet/in_var.h> 81 82 #include <nfs/nfs_lock.h> 83 84 #ifdef KDTRACE_HOOKS 85 #include <sys/dtrace_bsd.h> 86 87 dtrace_nfsclient_accesscache_flush_probe_func_t 88 dtrace_nfscl_accesscache_flush_done_probe; 89 uint32_t nfscl_accesscache_flush_done_id; 90 91 dtrace_nfsclient_accesscache_get_probe_func_t 92 dtrace_nfscl_accesscache_get_hit_probe, 93 dtrace_nfscl_accesscache_get_miss_probe; 94 uint32_t nfscl_accesscache_get_hit_id; 95 uint32_t nfscl_accesscache_get_miss_id; 96 97 dtrace_nfsclient_accesscache_load_probe_func_t 98 dtrace_nfscl_accesscache_load_done_probe; 99 uint32_t nfscl_accesscache_load_done_id; 100 #endif /* !KDTRACE_HOOKS */ 101 102 /* Defs */ 103 #define TRUE 1 104 #define FALSE 0 105 106 extern struct nfsstatsv1 nfsstatsv1; 107 extern int nfsrv_useacl; 108 extern int nfscl_debuglevel; 109 MALLOC_DECLARE(M_NEWNFSREQ); 110 111 static vop_read_t nfsfifo_read; 112 static vop_write_t nfsfifo_write; 113 static vop_close_t nfsfifo_close; 114 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *, 115 struct thread *); 116 static int nfs_get_namedattrdir(struct vnode *, struct componentname *, 117 struct vnode **); 118 static vop_lookup_t nfs_lookup; 119 static vop_create_t nfs_create; 120 static vop_mknod_t nfs_mknod; 121 static vop_open_t nfs_open; 122 static vop_pathconf_t nfs_pathconf; 123 static vop_close_t nfs_close; 124 static vop_access_t nfs_access; 125 static vop_getattr_t nfs_getattr; 126 static vop_setattr_t nfs_setattr; 127 static vop_read_t nfs_read; 128 static vop_fsync_t nfs_fsync; 129 static vop_remove_t nfs_remove; 130 static vop_link_t nfs_link; 131 static vop_rename_t nfs_rename; 132 static vop_mkdir_t nfs_mkdir; 133 static vop_rmdir_t nfs_rmdir; 134 static vop_symlink_t nfs_symlink; 135 static vop_readdir_t nfs_readdir; 136 static vop_strategy_t nfs_strategy; 137 static int nfs_lookitup(struct vnode *, char *, int, 138 struct ucred *, struct thread *, struct nfsnode **); 139 static int nfs_sillyrename(struct vnode *, struct vnode *, 140 struct componentname *); 141 static vop_access_t nfsspec_access; 142 static vop_readlink_t nfs_readlink; 143 static vop_print_t nfs_print; 144 static vop_advlock_t nfs_advlock; 145 static vop_advlockasync_t nfs_advlockasync; 146 static vop_getacl_t nfs_getacl; 147 static vop_setacl_t nfs_setacl; 148 static vop_advise_t nfs_advise; 149 static vop_allocate_t nfs_allocate; 150 static vop_deallocate_t nfs_deallocate; 151 static vop_copy_file_range_t nfs_copy_file_range; 152 static vop_ioctl_t nfs_ioctl; 153 static vop_getextattr_t nfs_getextattr; 154 static vop_setextattr_t nfs_setextattr; 155 static vop_listextattr_t nfs_listextattr; 156 static vop_deleteextattr_t nfs_deleteextattr; 157 static vop_lock1_t nfs_lock; 158 159 /* 160 * Global vfs data structures for nfs 161 */ 162 163 static struct vop_vector newnfs_vnodeops_nosig = { 164 .vop_default = &default_vnodeops, 165 .vop_access = nfs_access, 166 .vop_advlock = nfs_advlock, 167 .vop_advlockasync = nfs_advlockasync, 168 .vop_close = nfs_close, 169 .vop_create = nfs_create, 170 .vop_fsync = nfs_fsync, 171 .vop_getattr = nfs_getattr, 172 .vop_getpages = ncl_getpages, 173 .vop_putpages = ncl_putpages, 174 .vop_inactive = ncl_inactive, 175 .vop_link = nfs_link, 176 .vop_lock1 = nfs_lock, 177 .vop_lookup = nfs_lookup, 178 .vop_mkdir = nfs_mkdir, 179 .vop_mknod = nfs_mknod, 180 .vop_open = nfs_open, 181 .vop_pathconf = nfs_pathconf, 182 .vop_print = nfs_print, 183 .vop_read = nfs_read, 184 .vop_readdir = nfs_readdir, 185 .vop_readlink = nfs_readlink, 186 .vop_reclaim = ncl_reclaim, 187 .vop_remove = nfs_remove, 188 .vop_rename = nfs_rename, 189 .vop_rmdir = nfs_rmdir, 190 .vop_setattr = nfs_setattr, 191 .vop_strategy = nfs_strategy, 192 .vop_symlink = nfs_symlink, 193 .vop_write = ncl_write, 194 .vop_getacl = nfs_getacl, 195 .vop_setacl = nfs_setacl, 196 .vop_advise = nfs_advise, 197 .vop_allocate = nfs_allocate, 198 .vop_deallocate = nfs_deallocate, 199 .vop_copy_file_range = nfs_copy_file_range, 200 .vop_ioctl = nfs_ioctl, 201 .vop_getextattr = nfs_getextattr, 202 .vop_setextattr = nfs_setextattr, 203 .vop_listextattr = nfs_listextattr, 204 .vop_deleteextattr = nfs_deleteextattr, 205 }; 206 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops_nosig); 207 208 static int 209 nfs_vnodeops_bypass(struct vop_generic_args *a) 210 { 211 212 return (vop_sigdefer(&newnfs_vnodeops_nosig, a)); 213 } 214 215 struct vop_vector newnfs_vnodeops = { 216 .vop_default = &default_vnodeops, 217 .vop_bypass = nfs_vnodeops_bypass, 218 }; 219 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops); 220 221 static struct vop_vector newnfs_fifoops_nosig = { 222 .vop_default = &fifo_specops, 223 .vop_access = nfsspec_access, 224 .vop_close = nfsfifo_close, 225 .vop_fsync = nfs_fsync, 226 .vop_getattr = nfs_getattr, 227 .vop_inactive = ncl_inactive, 228 .vop_pathconf = nfs_pathconf, 229 .vop_print = nfs_print, 230 .vop_read = nfsfifo_read, 231 .vop_reclaim = ncl_reclaim, 232 .vop_setattr = nfs_setattr, 233 .vop_write = nfsfifo_write, 234 }; 235 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops_nosig); 236 237 static int 238 nfs_fifoops_bypass(struct vop_generic_args *a) 239 { 240 241 return (vop_sigdefer(&newnfs_fifoops_nosig, a)); 242 } 243 244 struct vop_vector newnfs_fifoops = { 245 .vop_default = &default_vnodeops, 246 .vop_bypass = nfs_fifoops_bypass, 247 }; 248 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops); 249 250 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 251 struct componentname *cnp, struct vattr *vap); 252 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 253 int namelen, struct ucred *cred, struct thread *td); 254 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, 255 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp, 256 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td); 257 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp, 258 struct componentname *scnp, struct sillyrename *sp); 259 260 /* 261 * Global variables 262 */ 263 SYSCTL_DECL(_vfs_nfs); 264 265 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 266 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 267 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 268 269 static int nfs_prime_access_cache = 0; 270 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW, 271 &nfs_prime_access_cache, 0, 272 "Prime NFS ACCESS cache when fetching attributes"); 273 274 static int newnfs_commit_on_close = 0; 275 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW, 276 &newnfs_commit_on_close, 0, "write+commit on close, else only write"); 277 278 static int nfs_clean_pages_on_close = 1; 279 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, 280 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); 281 282 int newnfs_directio_enable = 0; 283 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 284 &newnfs_directio_enable, 0, "Enable NFS directio"); 285 286 int nfs_keep_dirty_on_error; 287 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW, 288 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned"); 289 290 /* 291 * This sysctl allows other processes to mmap a file that has been opened 292 * O_DIRECT by a process. In general, having processes mmap the file while 293 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 294 * this by default to prevent DoS attacks - to prevent a malicious user from 295 * opening up files O_DIRECT preventing other users from mmap'ing these 296 * files. "Protected" environments where stricter consistency guarantees are 297 * required can disable this knob. The process that opened the file O_DIRECT 298 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 299 * meaningful. 300 */ 301 int newnfs_directio_allow_mmap = 1; 302 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 303 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 304 305 static uint64_t nfs_maxalloclen = 64 * 1024 * 1024; 306 SYSCTL_U64(_vfs_nfs, OID_AUTO, maxalloclen, CTLFLAG_RW, 307 &nfs_maxalloclen, 0, "NFS max allocate/deallocate length"); 308 309 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \ 310 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \ 311 | NFSACCESS_DELETE | NFSACCESS_LOOKUP) 312 313 /* 314 * SMP Locking Note : 315 * The list of locks after the description of the lock is the ordering 316 * of other locks acquired with the lock held. 317 * np->n_mtx : Protects the fields in the nfsnode. 318 VM Object Lock 319 VI_MTX (acquired indirectly) 320 * nmp->nm_mtx : Protects the fields in the nfsmount. 321 rep->r_mtx 322 * ncl_iod_mutex : Global lock, protects shared nfsiod state. 323 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. 324 nmp->nm_mtx 325 rep->r_mtx 326 * rep->r_mtx : Protects the fields in an nfsreq. 327 */ 328 329 static int 330 nfs_lock(struct vop_lock1_args *ap) 331 { 332 struct vnode *vp; 333 struct nfsnode *np; 334 u_quad_t nsize; 335 int error, lktype; 336 bool onfault; 337 338 vp = ap->a_vp; 339 lktype = ap->a_flags & LK_TYPE_MASK; 340 error = VOP_LOCK1_APV(&default_vnodeops, ap); 341 if (error != 0 || vp->v_op != &newnfs_vnodeops) 342 return (error); 343 np = VTONFS(vp); 344 if (np == NULL) 345 return (0); 346 NFSLOCKNODE(np); 347 if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED && 348 lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE && 349 lktype != LK_TRYUPGRADE)) { 350 NFSUNLOCKNODE(np); 351 return (0); 352 } 353 onfault = (ap->a_flags & LK_EATTR_MASK) == LK_NOWAIT && 354 (ap->a_flags & LK_INIT_MASK) == LK_CANRECURSE && 355 (lktype == LK_SHARED || lktype == LK_EXCLUSIVE); 356 if (onfault && vp->v_vnlock->lk_recurse == 0) { 357 /* 358 * Force retry in vm_fault(), to make the lock request 359 * sleepable, which allows us to piggy-back the 360 * sleepable call to vnode_pager_setsize(). 361 */ 362 NFSUNLOCKNODE(np); 363 VOP_UNLOCK(vp); 364 return (EBUSY); 365 } 366 if ((ap->a_flags & LK_NOWAIT) != 0 || 367 (lktype == LK_SHARED && vp->v_vnlock->lk_recurse > 0)) { 368 NFSUNLOCKNODE(np); 369 return (0); 370 } 371 if (lktype == LK_SHARED) { 372 NFSUNLOCKNODE(np); 373 VOP_UNLOCK(vp); 374 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 375 ap->a_flags |= LK_EXCLUSIVE; 376 error = VOP_LOCK1_APV(&default_vnodeops, ap); 377 if (error != 0 || vp->v_op != &newnfs_vnodeops) 378 return (error); 379 if (vp->v_data == NULL) 380 goto downgrade; 381 MPASS(vp->v_data == np); 382 NFSLOCKNODE(np); 383 if ((np->n_flag & NVNSETSZSKIP) == 0) { 384 NFSUNLOCKNODE(np); 385 goto downgrade; 386 } 387 } 388 np->n_flag &= ~NVNSETSZSKIP; 389 nsize = np->n_size; 390 NFSUNLOCKNODE(np); 391 vnode_pager_setsize(vp, nsize); 392 downgrade: 393 if (lktype == LK_SHARED) { 394 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 395 ap->a_flags |= LK_DOWNGRADE; 396 (void)VOP_LOCK1_APV(&default_vnodeops, ap); 397 } 398 return (0); 399 } 400 401 static int 402 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td, 403 struct ucred *cred, u_int32_t *retmode) 404 { 405 int error = 0, attrflag, i, lrupos; 406 u_int32_t rmode; 407 struct nfsnode *np = VTONFS(vp); 408 struct nfsvattr nfsva; 409 410 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag, 411 &rmode); 412 if (attrflag) 413 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 414 if (!error) { 415 lrupos = 0; 416 NFSLOCKNODE(np); 417 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 418 if (np->n_accesscache[i].uid == cred->cr_uid) { 419 np->n_accesscache[i].mode = rmode; 420 np->n_accesscache[i].stamp = time_second; 421 break; 422 } 423 if (i > 0 && np->n_accesscache[i].stamp < 424 np->n_accesscache[lrupos].stamp) 425 lrupos = i; 426 } 427 if (i == NFS_ACCESSCACHESIZE) { 428 np->n_accesscache[lrupos].uid = cred->cr_uid; 429 np->n_accesscache[lrupos].mode = rmode; 430 np->n_accesscache[lrupos].stamp = time_second; 431 } 432 NFSUNLOCKNODE(np); 433 if (retmode != NULL) 434 *retmode = rmode; 435 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0); 436 } else if (NFS_ISV4(vp)) { 437 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 438 } 439 #ifdef KDTRACE_HOOKS 440 if (error != 0) 441 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0, 442 error); 443 #endif 444 return (error); 445 } 446 447 /* 448 * nfs access vnode op. 449 * For nfs version 2, just return ok. File accesses may fail later. 450 * For nfs version 3, use the access rpc to check accessibility. If file modes 451 * are changed on the server, accesses might still fail later. 452 */ 453 static int 454 nfs_access(struct vop_access_args *ap) 455 { 456 struct vnode *vp = ap->a_vp; 457 int error = 0, i, gotahit; 458 u_int32_t mode, wmode, rmode; 459 int v34 = NFS_ISV34(vp); 460 struct nfsnode *np = VTONFS(vp); 461 462 /* 463 * Disallow write attempts on filesystems mounted read-only; 464 * unless the file is a socket, fifo, or a block or character 465 * device resident on the filesystem. 466 */ 467 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS | 468 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL | 469 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { 470 switch (vp->v_type) { 471 case VREG: 472 case VDIR: 473 case VLNK: 474 return (EROFS); 475 default: 476 break; 477 } 478 } 479 /* 480 * For nfs v3 or v4, check to see if we have done this recently, and if 481 * so return our cached result instead of making an ACCESS call. 482 * If not, do an access rpc, otherwise you are stuck emulating 483 * ufs_access() locally using the vattr. This may not be correct, 484 * since the server may apply other access criteria such as 485 * client uid-->server uid mapping that we do not know about. 486 */ 487 if (v34) { 488 if (ap->a_accmode & VREAD) 489 mode = NFSACCESS_READ; 490 else 491 mode = 0; 492 if (vp->v_type != VDIR) { 493 if (ap->a_accmode & VWRITE) 494 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 495 if (ap->a_accmode & VAPPEND) 496 mode |= NFSACCESS_EXTEND; 497 if (ap->a_accmode & VEXEC) 498 mode |= NFSACCESS_EXECUTE; 499 if (ap->a_accmode & VDELETE) 500 mode |= NFSACCESS_DELETE; 501 } else { 502 if (ap->a_accmode & VWRITE) 503 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 504 if (ap->a_accmode & VAPPEND) 505 mode |= NFSACCESS_EXTEND; 506 if (ap->a_accmode & VEXEC) 507 mode |= NFSACCESS_LOOKUP; 508 if (ap->a_accmode & VDELETE) 509 mode |= NFSACCESS_DELETE; 510 if (ap->a_accmode & VDELETE_CHILD) 511 mode |= NFSACCESS_MODIFY; 512 } 513 /* XXX safety belt, only make blanket request if caching */ 514 if (nfsaccess_cache_timeout > 0) { 515 wmode = NFSACCESS_READ | NFSACCESS_MODIFY | 516 NFSACCESS_EXTEND | NFSACCESS_EXECUTE | 517 NFSACCESS_DELETE | NFSACCESS_LOOKUP; 518 } else { 519 wmode = mode; 520 } 521 522 /* 523 * Does our cached result allow us to give a definite yes to 524 * this request? 525 */ 526 gotahit = 0; 527 NFSLOCKNODE(np); 528 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 529 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) { 530 if (time_second < (np->n_accesscache[i].stamp 531 + nfsaccess_cache_timeout) && 532 (np->n_accesscache[i].mode & mode) == mode) { 533 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits); 534 gotahit = 1; 535 } 536 break; 537 } 538 } 539 NFSUNLOCKNODE(np); 540 #ifdef KDTRACE_HOOKS 541 if (gotahit != 0) 542 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp, 543 ap->a_cred->cr_uid, mode); 544 else 545 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp, 546 ap->a_cred->cr_uid, mode); 547 #endif 548 if (gotahit == 0) { 549 /* 550 * Either a no, or a don't know. Go to the wire. 551 */ 552 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 553 error = nfs34_access_otw(vp, wmode, ap->a_td, 554 ap->a_cred, &rmode); 555 if (!error && 556 (rmode & mode) != mode) 557 error = EACCES; 558 } 559 return (error); 560 } else { 561 if ((error = nfsspec_access(ap)) != 0) { 562 return (error); 563 } 564 /* 565 * Attempt to prevent a mapped root from accessing a file 566 * which it shouldn't. We try to read a byte from the file 567 * if the user is root and the file is not zero length. 568 * After calling nfsspec_access, we should have the correct 569 * file size cached. 570 */ 571 NFSLOCKNODE(np); 572 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD) 573 && VTONFS(vp)->n_size > 0) { 574 struct iovec aiov; 575 struct uio auio; 576 char buf[1]; 577 578 NFSUNLOCKNODE(np); 579 aiov.iov_base = buf; 580 aiov.iov_len = 1; 581 auio.uio_iov = &aiov; 582 auio.uio_iovcnt = 1; 583 auio.uio_offset = 0; 584 auio.uio_resid = 1; 585 auio.uio_segflg = UIO_SYSSPACE; 586 auio.uio_rw = UIO_READ; 587 auio.uio_td = ap->a_td; 588 589 if (vp->v_type == VREG) 590 error = ncl_readrpc(vp, &auio, ap->a_cred); 591 else if (vp->v_type == VDIR) { 592 char* bp; 593 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 594 aiov.iov_base = bp; 595 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 596 error = ncl_readdirrpc(vp, &auio, ap->a_cred, 597 ap->a_td); 598 free(bp, M_TEMP); 599 } else if (vp->v_type == VLNK) 600 error = ncl_readlinkrpc(vp, &auio, ap->a_cred); 601 else 602 error = EACCES; 603 } else 604 NFSUNLOCKNODE(np); 605 return (error); 606 } 607 } 608 609 /* 610 * nfs open vnode op 611 * Check to see if the type is ok 612 * and that deletion is not in progress. 613 * For paged in text files, you will need to flush the page cache 614 * if consistency is lost. 615 */ 616 /* ARGSUSED */ 617 static int 618 nfs_open(struct vop_open_args *ap) 619 { 620 struct vnode *vp = ap->a_vp; 621 struct nfsnode *np = VTONFS(vp); 622 struct vattr vattr; 623 int error; 624 int fmode = ap->a_mode; 625 struct ucred *cred; 626 vm_object_t obj; 627 628 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 629 return (EOPNOTSUPP); 630 631 /* 632 * For NFSv4, we need to do the Open Op before cache validation, 633 * so that we conform to RFC3530 Sec. 9.3.1. 634 */ 635 if (NFS_ISV4(vp)) { 636 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td); 637 if (error) { 638 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 639 (gid_t)0); 640 return (error); 641 } 642 } 643 644 /* 645 * Now, if this Open will be doing reading, re-validate/flush the 646 * cache, so that Close/Open coherency is maintained. 647 */ 648 NFSLOCKNODE(np); 649 if (np->n_flag & NMODIFIED) { 650 NFSUNLOCKNODE(np); 651 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 652 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 653 if (VN_IS_DOOMED(vp)) 654 return (EBADF); 655 } 656 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 657 if (error == EINTR || error == EIO) { 658 if (NFS_ISV4(vp)) 659 (void) nfsrpc_close(vp, 0, ap->a_td); 660 return (error); 661 } 662 NFSLOCKNODE(np); 663 np->n_attrstamp = 0; 664 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 665 if (vp->v_type == VDIR) 666 np->n_direofoffset = 0; 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 np->n_mtime = vattr.va_mtime; 676 if (NFS_ISV4(vp)) 677 np->n_change = vattr.va_filerev; 678 } else { 679 NFSUNLOCKNODE(np); 680 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 681 if (error) { 682 if (NFS_ISV4(vp)) 683 (void) nfsrpc_close(vp, 0, ap->a_td); 684 return (error); 685 } 686 NFSLOCKNODE(np); 687 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) || 688 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 689 if (vp->v_type == VDIR) 690 np->n_direofoffset = 0; 691 NFSUNLOCKNODE(np); 692 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 693 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 694 if (VN_IS_DOOMED(vp)) 695 return (EBADF); 696 } 697 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 698 if (error == EINTR || error == EIO) { 699 if (NFS_ISV4(vp)) 700 (void) nfsrpc_close(vp, 0, ap->a_td); 701 return (error); 702 } 703 NFSLOCKNODE(np); 704 np->n_mtime = vattr.va_mtime; 705 if (NFS_ISV4(vp)) 706 np->n_change = vattr.va_filerev; 707 } 708 } 709 710 /* 711 * If the object has >= 1 O_DIRECT active opens, we disable caching. 712 */ 713 if (newnfs_directio_enable && (fmode & O_DIRECT) && 714 (vp->v_type == VREG)) { 715 if (np->n_directio_opens == 0) { 716 NFSUNLOCKNODE(np); 717 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 718 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 719 if (VN_IS_DOOMED(vp)) 720 return (EBADF); 721 } 722 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 723 if (error) { 724 if (NFS_ISV4(vp)) 725 (void) nfsrpc_close(vp, 0, ap->a_td); 726 return (error); 727 } 728 NFSLOCKNODE(np); 729 np->n_flag |= NNONCACHE; 730 } 731 np->n_directio_opens++; 732 } 733 734 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */ 735 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0) 736 np->n_flag |= NWRITEOPENED; 737 738 /* 739 * If this is an open for writing, capture a reference to the 740 * credentials, so they can be used by ncl_putpages(). Using 741 * these write credentials is preferable to the credentials of 742 * whatever thread happens to be doing the VOP_PUTPAGES() since 743 * the write RPCs are less likely to fail with EACCES. 744 */ 745 if ((fmode & FWRITE) != 0) { 746 cred = np->n_writecred; 747 np->n_writecred = crhold(ap->a_cred); 748 } else 749 cred = NULL; 750 NFSUNLOCKNODE(np); 751 752 if (cred != NULL) 753 crfree(cred); 754 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 755 756 /* 757 * If the text file has been mmap'd, flush any dirty pages to the 758 * buffer cache and then... 759 * Make sure all writes are pushed to the NFS server. If this is not 760 * done, the modify time of the file can change while the text 761 * file is being executed. This will cause the process that is 762 * executing the text file to be terminated. 763 */ 764 if (vp->v_writecount <= -1) { 765 if ((obj = vp->v_object) != NULL && 766 vm_object_mightbedirty(obj)) { 767 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 768 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 769 if (VN_IS_DOOMED(vp)) 770 return (EBADF); 771 } 772 vnode_pager_clean_sync(vp); 773 } 774 775 /* Now, flush the buffer cache. */ 776 ncl_flush(vp, MNT_WAIT, curthread, 0, 0); 777 778 /* And, finally, make sure that n_mtime is up to date. */ 779 np = VTONFS(vp); 780 NFSLOCKNODE(np); 781 np->n_mtime = np->n_vattr.na_mtime; 782 NFSUNLOCKNODE(np); 783 } 784 return (0); 785 } 786 787 /* 788 * nfs close vnode op 789 * What an NFS client should do upon close after writing is a debatable issue. 790 * Most NFS clients push delayed writes to the server upon close, basically for 791 * two reasons: 792 * 1 - So that any write errors may be reported back to the client process 793 * doing the close system call. By far the two most likely errors are 794 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 795 * 2 - To put a worst case upper bound on cache inconsistency between 796 * multiple clients for the file. 797 * There is also a consistency problem for Version 2 of the protocol w.r.t. 798 * not being able to tell if other clients are writing a file concurrently, 799 * since there is no way of knowing if the changed modify time in the reply 800 * is only due to the write for this client. 801 * (NFS Version 3 provides weak cache consistency data in the reply that 802 * should be sufficient to detect and handle this case.) 803 * 804 * The current code does the following: 805 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 806 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 807 * or commit them (this satisfies 1 and 2 except for the 808 * case where the server crashes after this close but 809 * before the commit RPC, which is felt to be "good 810 * enough". Changing the last argument to ncl_flush() to 811 * a 1 would force a commit operation, if it is felt a 812 * commit is necessary now. 813 * for NFS Version 4 - flush the dirty buffers and commit them, if 814 * nfscl_mustflush() says this is necessary. 815 * It is necessary if there is no write delegation held, 816 * in order to satisfy open/close coherency. 817 * If the file isn't cached on local stable storage, 818 * it may be necessary in order to detect "out of space" 819 * errors from the server, if the write delegation 820 * issued by the server doesn't allow the file to grow. 821 */ 822 /* ARGSUSED */ 823 static int 824 nfs_close(struct vop_close_args *ap) 825 { 826 struct vnode *vp = ap->a_vp; 827 struct nfsnode *np = VTONFS(vp); 828 struct nfsvattr nfsva; 829 struct ucred *cred; 830 int error = 0, ret, localcred = 0; 831 int fmode = ap->a_fflag; 832 833 if (NFSCL_FORCEDISM(vp->v_mount)) 834 return (0); 835 /* 836 * During shutdown, a_cred isn't valid, so just use root. 837 */ 838 if (ap->a_cred == NOCRED) { 839 cred = newnfs_getcred(); 840 localcred = 1; 841 } else { 842 cred = ap->a_cred; 843 } 844 if (vp->v_type == VREG) { 845 /* 846 * Examine and clean dirty pages, regardless of NMODIFIED. 847 * This closes a major hole in close-to-open consistency. 848 * We want to push out all dirty pages (and buffers) on 849 * close, regardless of whether they were dirtied by 850 * mmap'ed writes or via write(). 851 */ 852 if (nfs_clean_pages_on_close && vp->v_object) { 853 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 854 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 855 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK) 856 return (EBADF); 857 } 858 vnode_pager_clean_async(vp); 859 } 860 NFSLOCKNODE(np); 861 if (np->n_flag & NMODIFIED) { 862 NFSUNLOCKNODE(np); 863 if (NFS_ISV3(vp)) { 864 /* 865 * Under NFSv3 we have dirty buffers to dispose of. We 866 * must flush them to the NFS server. We have the option 867 * of waiting all the way through the commit rpc or just 868 * waiting for the initial write. The default is to only 869 * wait through the initial write so the data is in the 870 * server's cache, which is roughly similar to the state 871 * a standard disk subsystem leaves the file in on close(). 872 * 873 * We cannot clear the NMODIFIED bit in np->n_flag due to 874 * potential races with other processes, and certainly 875 * cannot clear it if we don't commit. 876 * These races occur when there is no longer the old 877 * traditional vnode locking implemented for Vnode Ops. 878 */ 879 int cm = newnfs_commit_on_close ? 1 : 0; 880 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 881 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 882 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK) 883 return (EBADF); 884 } 885 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0); 886 /* np->n_flag &= ~NMODIFIED; */ 887 } else if (NFS_ISV4(vp)) { 888 if (nfscl_mustflush(vp) != 0) { 889 int cm = newnfs_commit_on_close ? 1 : 0; 890 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 891 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 892 if (VN_IS_DOOMED(vp) && ap->a_fflag != 893 FNONBLOCK) 894 return (EBADF); 895 } 896 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 897 cm, 0); 898 /* 899 * as above w.r.t races when clearing 900 * NMODIFIED. 901 * np->n_flag &= ~NMODIFIED; 902 */ 903 } 904 } else { 905 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 906 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 907 if (VN_IS_DOOMED(vp) && ap->a_fflag != 908 FNONBLOCK) 909 return (EBADF); 910 } 911 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 912 } 913 NFSLOCKNODE(np); 914 } 915 /* 916 * Invalidate the attribute cache in all cases. 917 * An open is going to fetch fresh attrs any way, other procs 918 * on this node that have file open will be forced to do an 919 * otw attr fetch, but this is safe. 920 * --> A user found that their RPC count dropped by 20% when 921 * this was commented out and I can't see any requirement 922 * for it, so I've disabled it when negative lookups are 923 * enabled. (What does this have to do with negative lookup 924 * caching? Well nothing, except it was reported by the 925 * same user that needed negative lookup caching and I wanted 926 * there to be a way to disable it to see if it 927 * is the cause of some caching/coherency issue that might 928 * crop up.) 929 */ 930 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) { 931 np->n_attrstamp = 0; 932 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 933 } 934 if (np->n_flag & NWRITEERR) { 935 np->n_flag &= ~NWRITEERR; 936 error = np->n_error; 937 } 938 NFSUNLOCKNODE(np); 939 } 940 941 if (NFS_ISV4(vp)) { 942 /* 943 * Get attributes so "change" is up to date. 944 */ 945 if (error == 0 && nfscl_nodeleg(vp, 0) != 0 && 946 vp->v_type == VREG && 947 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) { 948 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva); 949 if (!ret) { 950 np->n_change = nfsva.na_filerev; 951 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 952 0, 0); 953 } 954 } 955 956 /* 957 * and do the close. 958 */ 959 ret = nfsrpc_close(vp, 0, ap->a_td); 960 if (!error && ret) 961 error = ret; 962 if (error) 963 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 964 (gid_t)0); 965 } 966 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 967 NFSLOCKNODE(np); 968 KASSERT((np->n_directio_opens > 0), 969 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 970 np->n_directio_opens--; 971 if (np->n_directio_opens == 0) 972 np->n_flag &= ~NNONCACHE; 973 NFSUNLOCKNODE(np); 974 } 975 if (localcred) 976 NFSFREECRED(cred); 977 return (error); 978 } 979 980 /* 981 * nfs getattr call from vfs. 982 */ 983 static int 984 nfs_getattr(struct vop_getattr_args *ap) 985 { 986 struct vnode *vp = ap->a_vp; 987 struct thread *td = curthread; /* XXX */ 988 struct nfsnode *np = VTONFS(vp); 989 int error = 0; 990 struct nfsvattr nfsva; 991 struct vattr *vap = ap->a_vap; 992 struct vattr vattr; 993 struct nfsmount *nmp; 994 995 nmp = VFSTONFS(vp->v_mount); 996 /* 997 * Update local times for special files. 998 */ 999 NFSLOCKNODE(np); 1000 if (np->n_flag & (NACC | NUPD)) 1001 np->n_flag |= NCHG; 1002 NFSUNLOCKNODE(np); 1003 /* 1004 * First look in the cache. 1005 * For "syskrb5" mounts, nm_fhsize might still be zero and 1006 * cached attributes should be ignored. 1007 */ 1008 if (nmp->nm_fhsize > 0 && ncl_getattrcache(vp, &vattr) == 0) { 1009 ncl_copy_vattr(vap, &vattr); 1010 1011 /* 1012 * Get the local modify time for the case of a write 1013 * delegation. 1014 */ 1015 nfscl_deleggetmodtime(vp, &vap->va_mtime); 1016 return (0); 1017 } 1018 1019 if (NFS_ISV34(vp) && nfs_prime_access_cache && 1020 nfsaccess_cache_timeout > 0) { 1021 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 1022 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL); 1023 if (ncl_getattrcache(vp, ap->a_vap) == 0) { 1024 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime); 1025 return (0); 1026 } 1027 } 1028 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva); 1029 if (!error) 1030 error = nfscl_loadattrcache(&vp, &nfsva, vap, 0, 0); 1031 if (!error) { 1032 /* 1033 * Get the local modify time for the case of a write 1034 * delegation. 1035 */ 1036 nfscl_deleggetmodtime(vp, &vap->va_mtime); 1037 } else if (NFS_ISV4(vp)) { 1038 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1039 } 1040 return (error); 1041 } 1042 1043 /* 1044 * nfs setattr call. 1045 */ 1046 static int 1047 nfs_setattr(struct vop_setattr_args *ap) 1048 { 1049 struct vnode *vp = ap->a_vp; 1050 struct nfsnode *np = VTONFS(vp); 1051 struct thread *td = curthread; /* XXX */ 1052 struct vattr *vap = ap->a_vap; 1053 int error = 0; 1054 u_quad_t tsize; 1055 struct timespec ts; 1056 1057 #ifndef nolint 1058 tsize = (u_quad_t)0; 1059 #endif 1060 1061 /* 1062 * Setting of flags and marking of atimes are not supported. 1063 */ 1064 if (vap->va_flags != VNOVAL) 1065 return (EOPNOTSUPP); 1066 1067 /* 1068 * Disallow write attempts if the filesystem is mounted read-only. 1069 */ 1070 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 1071 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 1072 vap->va_mtime.tv_sec != VNOVAL || 1073 vap->va_birthtime.tv_sec != VNOVAL || 1074 vap->va_mode != (mode_t)VNOVAL) && 1075 (vp->v_mount->mnt_flag & MNT_RDONLY)) 1076 return (EROFS); 1077 if (vap->va_size != VNOVAL) { 1078 switch (vp->v_type) { 1079 case VDIR: 1080 return (EISDIR); 1081 case VCHR: 1082 case VBLK: 1083 case VSOCK: 1084 case VFIFO: 1085 if (vap->va_mtime.tv_sec == VNOVAL && 1086 vap->va_atime.tv_sec == VNOVAL && 1087 vap->va_birthtime.tv_sec == VNOVAL && 1088 vap->va_mode == (mode_t)VNOVAL && 1089 vap->va_uid == (uid_t)VNOVAL && 1090 vap->va_gid == (gid_t)VNOVAL) 1091 return (0); 1092 vap->va_size = VNOVAL; 1093 break; 1094 default: 1095 /* 1096 * Disallow write attempts if the filesystem is 1097 * mounted read-only. 1098 */ 1099 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1100 return (EROFS); 1101 /* 1102 * We run vnode_pager_setsize() early (why?), 1103 * we must set np->n_size now to avoid vinvalbuf 1104 * V_SAVE races that might setsize a lower 1105 * value. 1106 */ 1107 NFSLOCKNODE(np); 1108 tsize = np->n_size; 1109 NFSUNLOCKNODE(np); 1110 error = ncl_meta_setsize(vp, td, vap->va_size); 1111 NFSLOCKNODE(np); 1112 if (np->n_flag & NMODIFIED) { 1113 tsize = np->n_size; 1114 NFSUNLOCKNODE(np); 1115 error = ncl_vinvalbuf(vp, vap->va_size == 0 ? 1116 0 : V_SAVE, td, 1); 1117 if (error != 0) { 1118 vnode_pager_setsize(vp, tsize); 1119 return (error); 1120 } 1121 /* 1122 * Call nfscl_delegmodtime() to set the modify time 1123 * locally, as required. 1124 */ 1125 nfscl_delegmodtime(vp, NULL); 1126 } else 1127 NFSUNLOCKNODE(np); 1128 /* 1129 * np->n_size has already been set to vap->va_size 1130 * in ncl_meta_setsize(). We must set it again since 1131 * nfs_loadattrcache() could be called through 1132 * ncl_meta_setsize() and could modify np->n_size. 1133 */ 1134 NFSLOCKNODE(np); 1135 np->n_vattr.na_size = np->n_size = vap->va_size; 1136 NFSUNLOCKNODE(np); 1137 } 1138 } else { 1139 NFSLOCKNODE(np); 1140 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 1141 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 1142 NFSUNLOCKNODE(np); 1143 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 1144 if (error == EINTR || error == EIO) 1145 return (error); 1146 } else 1147 NFSUNLOCKNODE(np); 1148 } 1149 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 1150 if (vap->va_size != VNOVAL) { 1151 if (error == 0) { 1152 nanouptime(&ts); 1153 NFSLOCKNODE(np); 1154 np->n_localmodtime = ts; 1155 NFSUNLOCKNODE(np); 1156 } else { 1157 NFSLOCKNODE(np); 1158 np->n_size = np->n_vattr.na_size = tsize; 1159 vnode_pager_setsize(vp, tsize); 1160 NFSUNLOCKNODE(np); 1161 } 1162 } 1163 if (vap->va_mtime.tv_sec != VNOVAL && error == 0) 1164 nfscl_delegmodtime(vp, &vap->va_mtime); 1165 return (error); 1166 } 1167 1168 /* 1169 * Do an nfs setattr rpc. 1170 */ 1171 static int 1172 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 1173 struct thread *td) 1174 { 1175 struct nfsnode *np = VTONFS(vp); 1176 int error, ret, attrflag, i; 1177 struct nfsvattr nfsva; 1178 1179 if (NFS_ISV34(vp)) { 1180 NFSLOCKNODE(np); 1181 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) 1182 np->n_accesscache[i].stamp = 0; 1183 np->n_flag |= NDELEGMOD; 1184 NFSUNLOCKNODE(np); 1185 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); 1186 } 1187 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag); 1188 if (attrflag) { 1189 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 1190 if (ret && !error) 1191 error = ret; 1192 } 1193 if (error && NFS_ISV4(vp)) 1194 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid); 1195 return (error); 1196 } 1197 1198 /* 1199 * Get a named attribute directory for the vnode. 1200 */ 1201 static int 1202 nfs_get_namedattrdir(struct vnode *vp, struct componentname *cnp, 1203 struct vnode **vpp) 1204 { 1205 struct nfsfh *nfhp; 1206 struct nfsnode *np; 1207 struct vnode *newvp; 1208 struct nfsvattr nfsva; 1209 int attrflag, error; 1210 1211 attrflag = 0; 1212 *vpp = NULL; 1213 np = VTONFS(vp); 1214 error = nfsrpc_openattr(VFSTONFS(vp->v_mount), vp, np->n_fhp->nfh_fh, 1215 np->n_fhp->nfh_len, (cnp->cn_flags & CREATENAMED), 1216 cnp->cn_cred, curthread, &nfsva, &nfhp, &attrflag); 1217 if (error == NFSERR_NOTSUPP) 1218 error = ENOATTR; 1219 if (error == 0) 1220 error = nfscl_nget(vp->v_mount, vp, nfhp, cnp, curthread, &np, 1221 cnp->cn_lkflags); 1222 if (error != 0) 1223 return (error); 1224 newvp = NFSTOV(np); 1225 vn_irflag_set_cond(newvp, VIRF_NAMEDDIR); 1226 if (attrflag != 0) 1227 (void)nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1228 *vpp = newvp; 1229 return (0); 1230 } 1231 1232 /* 1233 * nfs lookup call, one step at a time... 1234 * First look in cache 1235 * If not found, unlock the directory nfsnode and do the rpc 1236 */ 1237 static int 1238 nfs_lookup(struct vop_lookup_args *ap) 1239 { 1240 struct componentname *cnp = ap->a_cnp; 1241 struct vnode *dvp = ap->a_dvp; 1242 struct vnode **vpp = ap->a_vpp; 1243 struct mount *mp = dvp->v_mount; 1244 uint64_t flags = cnp->cn_flags; 1245 struct vnode *newvp; 1246 struct nfsmount *nmp; 1247 struct nfsnode *np, *newnp; 1248 int error = 0, attrflag, dattrflag, ltype, ncticks; 1249 struct thread *td = curthread; 1250 struct nfsfh *nfhp; 1251 struct nfsvattr dnfsva, nfsva; 1252 struct vattr vattr; 1253 struct timespec nctime, ts; 1254 uint32_t openmode; 1255 bool is_nameddir, needs_nameddir, opennamed; 1256 1257 dattrflag = 0; 1258 *vpp = NULLVP; 1259 nmp = VFSTONFS(mp); 1260 opennamed = (flags & (OPENNAMED | ISLASTCN)) == (OPENNAMED | ISLASTCN); 1261 if (opennamed && (!NFSHASNFSV4(nmp) || !NFSHASNFSV4N(nmp))) 1262 return (ENOATTR); 1263 is_nameddir = (vn_irflag_read(dvp) & VIRF_NAMEDDIR) != 0; 1264 if ((is_nameddir && (flags & ISLASTCN) == 0 && (cnp->cn_namelen > 1 || 1265 *cnp->cn_nameptr != '.')) || 1266 (opennamed && !is_nameddir && (flags & ISDOTDOT) != 0)) 1267 return (ENOATTR); 1268 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) && 1269 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 1270 return (EROFS); 1271 np = VTONFS(dvp); 1272 1273 needs_nameddir = false; 1274 if (opennamed || is_nameddir) { 1275 cnp->cn_flags &= ~MAKEENTRY; 1276 if (!is_nameddir) 1277 needs_nameddir = true; 1278 } 1279 1280 /* 1281 * If the named attribute directory is needed, acquire it now. 1282 */ 1283 newvp = NULLVP; 1284 if (needs_nameddir) { 1285 KASSERT(np->n_v4 == NULL, ("nfs_lookup: O_NAMEDATTR when" 1286 " n_v4 not NULL")); 1287 error = nfs_get_namedattrdir(dvp, cnp, &newvp); 1288 if (error != 0) 1289 goto handle_error; 1290 if (cnp->cn_namelen == 1 && *cnp->cn_nameptr == '.') { 1291 *vpp = newvp; 1292 return (0); 1293 } 1294 dvp = newvp; 1295 np = VTONFS(dvp); 1296 newvp = NULLVP; 1297 } else if (opennamed && cnp->cn_namelen == 1 && 1298 *cnp->cn_nameptr == '.') { 1299 VREF(dvp); 1300 *vpp = dvp; 1301 return (0); 1302 } 1303 1304 if (dvp->v_type != VDIR) 1305 return (ENOTDIR); 1306 1307 /* For NFSv4, wait until any remove is done. */ 1308 NFSLOCKNODE(np); 1309 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) { 1310 np->n_flag |= NREMOVEWANT; 1311 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0); 1312 } 1313 NFSUNLOCKNODE(np); 1314 1315 error = vn_dir_check_exec(dvp, cnp); 1316 if (error != 0) 1317 return (error); 1318 1319 if (!opennamed && !is_nameddir) { 1320 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks); 1321 if (error > 0 && error != ENOENT) 1322 return (error); 1323 if (error == -1) { 1324 /* 1325 * Lookups of "." are special and always return the 1326 * current directory. cache_lookup() already handles 1327 * associated locking bookkeeping, etc. 1328 */ 1329 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 1330 return (0); 1331 } 1332 1333 /* 1334 * We only accept a positive hit in the cache if the 1335 * change time of the file matches our cached copy. 1336 * Otherwise, we discard the cache entry and fallback 1337 * to doing a lookup RPC. We also only trust cache 1338 * entries for less than nm_nametimeo seconds. 1339 * 1340 * To better handle stale file handles and attributes, 1341 * clear the attribute cache of this node if it is a 1342 * leaf component, part of an open() call, and not 1343 * locally modified before fetching the attributes. 1344 * This should allow stale file handles to be detected 1345 * here where we can fall back to a LOOKUP RPC to 1346 * recover rather than having nfs_open() detect the 1347 * stale file handle and failing open(2) with ESTALE. 1348 */ 1349 newvp = *vpp; 1350 newnp = VTONFS(newvp); 1351 if (!(nmp->nm_flag & NFSMNT_NOCTO) && 1352 (flags & (ISLASTCN | ISOPEN)) == 1353 (ISLASTCN | ISOPEN) && 1354 !(newnp->n_flag & NMODIFIED)) { 1355 NFSLOCKNODE(newnp); 1356 newnp->n_attrstamp = 0; 1357 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1358 NFSUNLOCKNODE(newnp); 1359 } 1360 if (nfscl_nodeleg(newvp, 0) == 0 || 1361 ((u_int)(ticks - ncticks) < 1362 (nmp->nm_nametimeo * hz) && 1363 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 && 1364 timespeccmp(&vattr.va_ctime, &nctime, ==))) { 1365 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1366 return (0); 1367 } 1368 cache_purge(newvp); 1369 if (dvp != newvp) 1370 vput(newvp); 1371 else 1372 vrele(newvp); 1373 *vpp = NULLVP; 1374 } else if (error == ENOENT) { 1375 if (VN_IS_DOOMED(dvp)) 1376 return (ENOENT); 1377 /* 1378 * We only accept a negative hit in the cache if the 1379 * modification time of the parent directory matches 1380 * the cached copy in the name cache entry. 1381 * Otherwise, we discard all of the negative cache 1382 * entries for this directory. We also only trust 1383 * negative cache entries for up to nm_negnametimeo 1384 * seconds. 1385 */ 1386 if ((u_int)(ticks - ncticks) < 1387 (nmp->nm_negnametimeo * hz) && 1388 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && 1389 timespeccmp(&vattr.va_mtime, &nctime, ==)) { 1390 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1391 return (ENOENT); 1392 } 1393 cache_purge_negative(dvp); 1394 } 1395 } 1396 1397 openmode = 0; 1398 #if 0 1399 /* 1400 * The use of LookupOpen breaks some builds. It is disabled 1401 * until that is fixed. 1402 */ 1403 /* 1404 * If this an NFSv4.1/4.2 mount using the "oneopenown" mount 1405 * option, it is possible to do the Open operation in the same 1406 * compound as Lookup, so long as delegations are not being 1407 * issued. This saves doing a separate RPC for Open. 1408 * For pnfs, do not do this, since the Open+LayoutGet will 1409 * be needed as a separate RPC. 1410 */ 1411 NFSLOCKMNT(nmp); 1412 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp) && !NFSHASPNFS(nmp) && 1413 (nmp->nm_privflag & NFSMNTP_DELEGISSUED) == 0 && 1414 (!NFSMNT_RDONLY(mp) || (flags & OPENWRITE) == 0) && 1415 (flags & (ISLASTCN | ISOPEN | OPENNAMED))) == (ISLASTCN | ISOPEN)) { 1416 if ((flags & OPENREAD) != 0) 1417 openmode |= NFSV4OPEN_ACCESSREAD; 1418 if ((flags & OPENWRITE) != 0) 1419 openmode |= NFSV4OPEN_ACCESSWRITE; 1420 } 1421 NFSUNLOCKMNT(nmp); 1422 #endif 1423 1424 newvp = NULLVP; 1425 NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses); 1426 nanouptime(&ts); 1427 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1428 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1429 openmode); 1430 if (dattrflag) 1431 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 1432 if (needs_nameddir) { 1433 vput(dvp); 1434 dvp = ap->a_dvp; 1435 } 1436 handle_error: 1437 if (error) { 1438 if (newvp != NULLVP) { 1439 vput(newvp); 1440 *vpp = NULLVP; 1441 } 1442 1443 if (error != ENOENT) { 1444 if (NFS_ISV4(dvp)) 1445 error = nfscl_maperr(td, error, 1446 (uid_t)0, (gid_t)0); 1447 return (error); 1448 } 1449 1450 /* The requested file was not found. */ 1451 if ((cnp->cn_nameiop == CREATE || 1452 cnp->cn_nameiop == RENAME) && 1453 (flags & ISLASTCN)) { 1454 /* 1455 * XXX: UFS does a full VOP_ACCESS(dvp, 1456 * VWRITE) here instead of just checking 1457 * MNT_RDONLY. 1458 */ 1459 if (mp->mnt_flag & MNT_RDONLY) 1460 return (EROFS); 1461 return (EJUSTRETURN); 1462 } 1463 1464 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) { 1465 /* 1466 * Cache the modification time of the parent 1467 * directory from the post-op attributes in 1468 * the name cache entry. The negative cache 1469 * entry will be ignored once the directory 1470 * has changed. Don't bother adding the entry 1471 * if the directory has already changed. 1472 */ 1473 NFSLOCKNODE(np); 1474 if (timespeccmp(&np->n_vattr.na_mtime, 1475 &dnfsva.na_mtime, ==)) { 1476 NFSUNLOCKNODE(np); 1477 cache_enter_time(dvp, NULL, cnp, 1478 &dnfsva.na_mtime, NULL); 1479 } else 1480 NFSUNLOCKNODE(np); 1481 } 1482 return (ENOENT); 1483 } 1484 1485 /* 1486 * Handle RENAME case... 1487 */ 1488 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 1489 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1490 free(nfhp, M_NFSFH); 1491 return (EISDIR); 1492 } 1493 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, 1494 LK_EXCLUSIVE); 1495 if (error) 1496 return (error); 1497 newvp = NFSTOV(np); 1498 /* 1499 * If n_localmodtime >= time before RPC, then 1500 * a file modification operation, such as 1501 * VOP_SETATTR() of size, has occurred while 1502 * the Lookup RPC and acquisition of the vnode 1503 * happened. As such, the attributes might 1504 * be stale, with possibly an incorrect size. 1505 */ 1506 NFSLOCKNODE(np); 1507 if (timespecisset(&np->n_localmodtime) && 1508 timespeccmp(&np->n_localmodtime, &ts, >=)) { 1509 NFSCL_DEBUG(4, "nfs_lookup: rename localmod " 1510 "stale attributes\n"); 1511 attrflag = 0; 1512 } 1513 NFSUNLOCKNODE(np); 1514 if (attrflag) 1515 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 1516 0, 1); 1517 *vpp = newvp; 1518 return (0); 1519 } 1520 1521 if (flags & ISDOTDOT) { 1522 ltype = NFSVOPISLOCKED(dvp); 1523 error = vfs_busy(mp, MBF_NOWAIT); 1524 if (error != 0) { 1525 vfs_ref(mp); 1526 NFSVOPUNLOCK(dvp); 1527 error = vfs_busy(mp, 0); 1528 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1529 vfs_rel(mp); 1530 if (error == 0 && VN_IS_DOOMED(dvp)) { 1531 vfs_unbusy(mp); 1532 error = ENOENT; 1533 } 1534 if (error != 0) 1535 return (error); 1536 } 1537 NFSVOPUNLOCK(dvp); 1538 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, 1539 cnp->cn_lkflags); 1540 if (error == 0) 1541 newvp = NFSTOV(np); 1542 vfs_unbusy(mp); 1543 if (newvp != dvp) 1544 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1545 if (VN_IS_DOOMED(dvp)) { 1546 if (error == 0) { 1547 if (newvp == dvp) 1548 vrele(newvp); 1549 else 1550 vput(newvp); 1551 } 1552 error = ENOENT; 1553 } 1554 if (error != 0) 1555 return (error); 1556 if (attrflag) 1557 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 1558 0, 1); 1559 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1560 free(nfhp, M_NFSFH); 1561 VREF(dvp); 1562 newvp = dvp; 1563 if (attrflag) 1564 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 1565 0, 1); 1566 } else { 1567 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, 1568 cnp->cn_lkflags); 1569 if (error) 1570 return (error); 1571 newvp = NFSTOV(np); 1572 if (opennamed) 1573 vn_irflag_set_cond(newvp, VIRF_NAMEDATTR); 1574 /* 1575 * If n_localmodtime >= time before RPC, then 1576 * a file modification operation, such as 1577 * VOP_SETATTR() of size, has occurred while 1578 * the Lookup RPC and acquisition of the vnode 1579 * happened. As such, the attributes might 1580 * be stale, with possibly an incorrect size. 1581 */ 1582 NFSLOCKNODE(np); 1583 if (timespecisset(&np->n_localmodtime) && 1584 timespeccmp(&np->n_localmodtime, &ts, >=)) { 1585 NFSCL_DEBUG(4, "nfs_lookup: localmod " 1586 "stale attributes\n"); 1587 attrflag = 0; 1588 } 1589 NFSUNLOCKNODE(np); 1590 if (attrflag) 1591 (void)nfscl_loadattrcache(&newvp, &nfsva, NULL, 1592 0, 1); 1593 else if ((flags & (ISLASTCN | ISOPEN)) == 1594 (ISLASTCN | ISOPEN) && 1595 !(np->n_flag & NMODIFIED)) { 1596 /* 1597 * Flush the attribute cache when opening a 1598 * leaf node to ensure that fresh attributes 1599 * are fetched in nfs_open() since we did not 1600 * fetch attributes from the LOOKUP reply. 1601 */ 1602 NFSLOCKNODE(np); 1603 np->n_attrstamp = 0; 1604 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1605 NFSUNLOCKNODE(np); 1606 } 1607 } 1608 if ((cnp->cn_flags & MAKEENTRY) && dvp != newvp && 1609 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) && 1610 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0)) 1611 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 1612 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime); 1613 *vpp = newvp; 1614 return (0); 1615 } 1616 1617 /* 1618 * nfs read call. 1619 * Just call ncl_bioread() to do the work. 1620 */ 1621 static int 1622 nfs_read(struct vop_read_args *ap) 1623 { 1624 struct vnode *vp = ap->a_vp; 1625 1626 switch (vp->v_type) { 1627 case VREG: 1628 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1629 case VDIR: 1630 return (EISDIR); 1631 default: 1632 return (EOPNOTSUPP); 1633 } 1634 } 1635 1636 /* 1637 * nfs readlink call 1638 */ 1639 static int 1640 nfs_readlink(struct vop_readlink_args *ap) 1641 { 1642 struct vnode *vp = ap->a_vp; 1643 1644 if (vp->v_type != VLNK) 1645 return (EINVAL); 1646 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1647 } 1648 1649 /* 1650 * Do a readlink rpc. 1651 * Called by ncl_doio() from below the buffer cache. 1652 */ 1653 int 1654 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1655 { 1656 int error, ret, attrflag; 1657 struct nfsvattr nfsva; 1658 1659 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva, 1660 &attrflag); 1661 if (attrflag) { 1662 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 1663 if (ret && !error) 1664 error = ret; 1665 } 1666 if (error && NFS_ISV4(vp)) 1667 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1668 return (error); 1669 } 1670 1671 /* 1672 * nfs read rpc call 1673 * Ditto above 1674 */ 1675 int 1676 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1677 { 1678 int error, ret, attrflag; 1679 struct nfsvattr nfsva; 1680 struct nfsmount *nmp; 1681 1682 nmp = VFSTONFS(vp->v_mount); 1683 error = EIO; 1684 attrflag = 0; 1685 if (NFSHASPNFS(nmp)) 1686 error = nfscl_doiods(vp, uiop, NULL, NULL, 1687 NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td); 1688 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error); 1689 if (error != 0 && error != EFAULT) 1690 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, 1691 &attrflag); 1692 if (attrflag) { 1693 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 1694 if (ret && !error) 1695 error = ret; 1696 } 1697 if (error && NFS_ISV4(vp)) 1698 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1699 return (error); 1700 } 1701 1702 /* 1703 * nfs write call 1704 */ 1705 int 1706 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1707 int *iomode, int *must_commit, int called_from_strategy, int ioflag) 1708 { 1709 struct nfsvattr nfsva; 1710 int error, attrflag, ret; 1711 struct nfsmount *nmp; 1712 1713 nmp = VFSTONFS(vp->v_mount); 1714 error = EIO; 1715 attrflag = 0; 1716 if (NFSHASPNFS(nmp)) 1717 error = nfscl_doiods(vp, uiop, iomode, must_commit, 1718 NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td); 1719 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error); 1720 if (error != 0 && error != EFAULT) 1721 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred, 1722 uiop->uio_td, &nfsva, &attrflag, called_from_strategy, 1723 ioflag); 1724 if (attrflag) { 1725 if (VTONFS(vp)->n_flag & ND_NFSV4) 1726 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 1, 1); 1727 else 1728 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 1729 if (ret && !error) 1730 error = ret; 1731 } 1732 if (DOINGASYNC(vp)) 1733 *iomode = NFSWRITE_FILESYNC; 1734 if (error && NFS_ISV4(vp)) 1735 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1736 return (error); 1737 } 1738 1739 /* 1740 * nfs mknod rpc 1741 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1742 * mode set to specify the file type and the size field for rdev. 1743 */ 1744 static int 1745 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1746 struct vattr *vap) 1747 { 1748 struct nfsvattr nfsva, dnfsva; 1749 struct vnode *newvp = NULL; 1750 struct nfsnode *np = NULL, *dnp; 1751 struct nfsfh *nfhp; 1752 struct vattr vattr; 1753 int error = 0, attrflag, dattrflag; 1754 u_int32_t rdev; 1755 1756 if (vap->va_type == VCHR || vap->va_type == VBLK) 1757 rdev = vap->va_rdev; 1758 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1759 rdev = 0xffffffff; 1760 else 1761 return (EOPNOTSUPP); 1762 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1763 return (error); 1764 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap, 1765 rdev, vap->va_type, cnp->cn_cred, curthread, &dnfsva, 1766 &nfsva, &nfhp, &attrflag, &dattrflag); 1767 if (!error) { 1768 if (!nfhp) 1769 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1770 cnp->cn_namelen, cnp->cn_cred, curthread, 1771 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 0); 1772 if (nfhp) 1773 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1774 curthread, &np, LK_EXCLUSIVE); 1775 } 1776 if (dattrflag) 1777 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 1778 if (!error) { 1779 newvp = NFSTOV(np); 1780 if (attrflag != 0) { 1781 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1782 if (error != 0) 1783 vput(newvp); 1784 } 1785 } 1786 if (!error) { 1787 *vpp = newvp; 1788 } else if (NFS_ISV4(dvp)) { 1789 error = nfscl_maperr(curthread, error, vap->va_uid, 1790 vap->va_gid); 1791 } 1792 dnp = VTONFS(dvp); 1793 NFSLOCKNODE(dnp); 1794 dnp->n_flag |= NMODIFIED; 1795 if (!dattrflag) { 1796 dnp->n_attrstamp = 0; 1797 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1798 } 1799 NFSUNLOCKNODE(dnp); 1800 return (error); 1801 } 1802 1803 /* 1804 * nfs mknod vop 1805 * just call nfs_mknodrpc() to do the work. 1806 */ 1807 /* ARGSUSED */ 1808 static int 1809 nfs_mknod(struct vop_mknod_args *ap) 1810 { 1811 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1812 } 1813 1814 static struct mtx nfs_cverf_mtx; 1815 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex", 1816 MTX_DEF); 1817 1818 static nfsquad_t 1819 nfs_get_cverf(void) 1820 { 1821 static nfsquad_t cverf; 1822 nfsquad_t ret; 1823 static int cverf_initialized = 0; 1824 1825 mtx_lock(&nfs_cverf_mtx); 1826 if (cverf_initialized == 0) { 1827 cverf.lval[0] = arc4random(); 1828 cverf.lval[1] = arc4random(); 1829 cverf_initialized = 1; 1830 } else 1831 cverf.qval++; 1832 ret = cverf; 1833 mtx_unlock(&nfs_cverf_mtx); 1834 1835 return (ret); 1836 } 1837 1838 /* 1839 * nfs file create call 1840 */ 1841 static int 1842 nfs_create(struct vop_create_args *ap) 1843 { 1844 struct vnode *dvp = ap->a_dvp; 1845 struct vattr *vap = ap->a_vap; 1846 struct componentname *cnp = ap->a_cnp; 1847 struct nfsnode *np = NULL, *dnp; 1848 struct vnode *newvp = NULL; 1849 struct nfsmount *nmp; 1850 struct nfsvattr dnfsva, nfsva; 1851 struct nfsfh *nfhp; 1852 nfsquad_t cverf; 1853 int error = 0, attrflag, dattrflag, fmode = 0; 1854 struct vattr vattr; 1855 bool is_nameddir, needs_nameddir, opennamed; 1856 1857 /* 1858 * Oops, not for me.. 1859 */ 1860 if (vap->va_type == VSOCK) 1861 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1862 1863 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1864 return (error); 1865 if (vap->va_vaflags & VA_EXCLUSIVE) 1866 fmode |= O_EXCL; 1867 dnp = VTONFS(dvp); 1868 nmp = VFSTONFS(dvp->v_mount); 1869 needs_nameddir = false; 1870 if (NFSHASNFSV4(nmp) && NFSHASNFSV4N(nmp)) { 1871 opennamed = (cnp->cn_flags & (OPENNAMED | ISLASTCN)) == 1872 (OPENNAMED | ISLASTCN); 1873 is_nameddir = (vn_irflag_read(dvp) & VIRF_NAMEDDIR) != 0; 1874 if (opennamed || is_nameddir) { 1875 cnp->cn_flags &= ~MAKEENTRY; 1876 if (!is_nameddir) 1877 needs_nameddir = true; 1878 } 1879 } 1880 1881 /* 1882 * If the named attribute directory is needed, acquire it now. 1883 */ 1884 if (needs_nameddir) { 1885 KASSERT(dnp->n_v4 == NULL, ("nfs_create: O_NAMEDATTR when" 1886 " n_v4 not NULL")); 1887 error = nfs_get_namedattrdir(dvp, cnp, &newvp); 1888 if (error != 0) 1889 return (error); 1890 dvp = newvp; 1891 dnp = VTONFS(dvp); 1892 newvp = NULL; 1893 } 1894 1895 again: 1896 /* For NFSv4, wait until any remove is done. */ 1897 NFSLOCKNODE(dnp); 1898 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) { 1899 dnp->n_flag |= NREMOVEWANT; 1900 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0); 1901 } 1902 NFSUNLOCKNODE(dnp); 1903 1904 cverf = nfs_get_cverf(); 1905 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1906 vap, cverf, fmode, cnp->cn_cred, curthread, &dnfsva, &nfsva, 1907 &nfhp, &attrflag, &dattrflag); 1908 if (!error) { 1909 if (nfhp == NULL) 1910 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1911 cnp->cn_namelen, cnp->cn_cred, curthread, 1912 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 0); 1913 if (nfhp != NULL) 1914 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1915 curthread, &np, LK_EXCLUSIVE); 1916 } 1917 if (dattrflag) 1918 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 1919 if (!error) { 1920 newvp = NFSTOV(np); 1921 if (attrflag == 0) 1922 error = nfsrpc_getattr(newvp, cnp->cn_cred, curthread, 1923 &nfsva); 1924 if (error == 0) 1925 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1926 } 1927 if (error) { 1928 if (newvp != NULL) { 1929 vput(newvp); 1930 newvp = NULL; 1931 } 1932 if (NFS_ISV34(dvp) && (fmode & O_EXCL) && 1933 error == NFSERR_NOTSUPP) { 1934 fmode &= ~O_EXCL; 1935 goto again; 1936 } 1937 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) { 1938 if (nfscl_checksattr(vap, &nfsva)) { 1939 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred, 1940 curthread, &nfsva, &attrflag); 1941 if (error && (vap->va_uid != (uid_t)VNOVAL || 1942 vap->va_gid != (gid_t)VNOVAL)) { 1943 /* try again without setting uid/gid */ 1944 vap->va_uid = (uid_t)VNOVAL; 1945 vap->va_gid = (uid_t)VNOVAL; 1946 error = nfsrpc_setattr(newvp, vap, NULL, 1947 cnp->cn_cred, curthread, &nfsva, &attrflag); 1948 } 1949 if (attrflag) 1950 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 1951 0, 1); 1952 if (error != 0) 1953 vput(newvp); 1954 } 1955 } 1956 if (!error) { 1957 if ((cnp->cn_flags & MAKEENTRY) && attrflag) { 1958 if (dvp != newvp) 1959 cache_enter_time(dvp, newvp, cnp, 1960 &nfsva.na_ctime, NULL); 1961 else 1962 printf("nfs_create: bogus NFS server returned " 1963 "the directory as the new file object\n"); 1964 } 1965 *ap->a_vpp = newvp; 1966 } else if (NFS_ISV4(dvp)) { 1967 error = nfscl_maperr(curthread, error, vap->va_uid, 1968 vap->va_gid); 1969 } 1970 NFSLOCKNODE(dnp); 1971 dnp->n_flag |= NMODIFIED; 1972 if (!dattrflag) { 1973 dnp->n_attrstamp = 0; 1974 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1975 } 1976 NFSUNLOCKNODE(dnp); 1977 if (needs_nameddir) 1978 vput(dvp); 1979 return (error); 1980 } 1981 1982 /* 1983 * nfs file remove call 1984 * To try and make nfs semantics closer to ufs semantics, a file that has 1985 * other processes using the vnode is renamed instead of removed and then 1986 * removed later on the last close. 1987 * - If v_usecount > 1 1988 * If a rename is not already in the works 1989 * call nfs_sillyrename() to set it up 1990 * else 1991 * do the remove rpc 1992 */ 1993 static int 1994 nfs_remove(struct vop_remove_args *ap) 1995 { 1996 struct vnode *vp = ap->a_vp; 1997 struct vnode *dvp = ap->a_dvp; 1998 struct componentname *cnp = ap->a_cnp; 1999 struct nfsnode *np = VTONFS(vp); 2000 int error = 0; 2001 struct vattr vattr; 2002 2003 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount")); 2004 if (vp->v_type == VDIR) 2005 error = EPERM; 2006 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 2007 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 2008 vattr.va_nlink > 1)) { 2009 /* 2010 * Purge the name cache so that the chance of a lookup for 2011 * the name succeeding while the remove is in progress is 2012 * minimized. Without node locking it can still happen, such 2013 * that an I/O op returns ESTALE, but since you get this if 2014 * another host removes the file.. 2015 */ 2016 cache_purge(vp); 2017 /* 2018 * throw away biocache buffers, mainly to avoid 2019 * unnecessary delayed writes later. 2020 */ 2021 error = ncl_vinvalbuf(vp, 0, curthread, 1); 2022 if (error != EINTR && error != EIO) 2023 /* Do the rpc */ 2024 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr, 2025 cnp->cn_namelen, cnp->cn_cred, curthread); 2026 /* 2027 * Kludge City: If the first reply to the remove rpc is lost.. 2028 * the reply to the retransmitted request will be ENOENT 2029 * since the file was in fact removed 2030 * Therefore, we cheat and return success. 2031 */ 2032 if (error == ENOENT) 2033 error = 0; 2034 } else if (!np->n_sillyrename) 2035 error = nfs_sillyrename(dvp, vp, cnp); 2036 NFSLOCKNODE(np); 2037 np->n_attrstamp = 0; 2038 NFSUNLOCKNODE(np); 2039 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 2040 return (error); 2041 } 2042 2043 /* 2044 * nfs file remove rpc called from nfs_inactive 2045 */ 2046 int 2047 ncl_removeit(struct sillyrename *sp, struct vnode *vp) 2048 { 2049 /* 2050 * Make sure that the directory vnode is still valid. 2051 * XXX we should lock sp->s_dvp here. 2052 */ 2053 if (sp->s_dvp->v_type == VBAD) 2054 return (0); 2055 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen, 2056 sp->s_cred, NULL)); 2057 } 2058 2059 /* 2060 * Nfs remove rpc, called from nfs_remove() and ncl_removeit(). 2061 */ 2062 static int 2063 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 2064 int namelen, struct ucred *cred, struct thread *td) 2065 { 2066 struct nfsvattr dnfsva; 2067 struct nfsnode *dnp = VTONFS(dvp); 2068 int error = 0, dattrflag; 2069 2070 NFSLOCKNODE(dnp); 2071 dnp->n_flag |= NREMOVEINPROG; 2072 NFSUNLOCKNODE(dnp); 2073 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva, 2074 &dattrflag); 2075 NFSLOCKNODE(dnp); 2076 if ((dnp->n_flag & NREMOVEWANT)) { 2077 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG); 2078 NFSUNLOCKNODE(dnp); 2079 wakeup((caddr_t)dnp); 2080 } else { 2081 dnp->n_flag &= ~NREMOVEINPROG; 2082 NFSUNLOCKNODE(dnp); 2083 } 2084 if (dattrflag) 2085 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 2086 NFSLOCKNODE(dnp); 2087 dnp->n_flag |= NMODIFIED; 2088 if (!dattrflag) { 2089 dnp->n_attrstamp = 0; 2090 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2091 } 2092 NFSUNLOCKNODE(dnp); 2093 if (error && NFS_ISV4(dvp)) 2094 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2095 return (error); 2096 } 2097 2098 /* 2099 * nfs file rename call 2100 */ 2101 static int 2102 nfs_rename(struct vop_rename_args *ap) 2103 { 2104 struct vnode *fvp = ap->a_fvp; 2105 struct vnode *tvp = ap->a_tvp; 2106 struct vnode *fdvp = ap->a_fdvp; 2107 struct vnode *tdvp = ap->a_tdvp; 2108 struct componentname *tcnp = ap->a_tcnp; 2109 struct componentname *fcnp = ap->a_fcnp; 2110 struct nfsnode *fnp = VTONFS(ap->a_fvp); 2111 struct nfsnode *tdnp = VTONFS(ap->a_tdvp); 2112 struct nfsv4node *newv4 = NULL; 2113 int error; 2114 2115 /* Check for cross-device rename */ 2116 if ((fvp->v_mount != tdvp->v_mount) || 2117 (tvp && (fvp->v_mount != tvp->v_mount))) { 2118 error = EXDEV; 2119 goto out; 2120 } 2121 2122 if (fvp == tvp) { 2123 printf("nfs_rename: fvp == tvp (can't happen)\n"); 2124 error = 0; 2125 goto out; 2126 } 2127 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0) 2128 goto out; 2129 2130 /* 2131 * We have to flush B_DELWRI data prior to renaming 2132 * the file. If we don't, the delayed-write buffers 2133 * can be flushed out later after the file has gone stale 2134 * under NFSV3. NFSV2 does not have this problem because 2135 * ( as far as I can tell ) it flushes dirty buffers more 2136 * often. 2137 * 2138 * Skip the rename operation if the fsync fails, this can happen 2139 * due to the server's volume being full, when we pushed out data 2140 * that was written back to our cache earlier. Not checking for 2141 * this condition can result in potential (silent) data loss. 2142 */ 2143 error = VOP_FSYNC(fvp, MNT_WAIT, curthread); 2144 NFSVOPUNLOCK(fvp); 2145 if (!error && tvp) 2146 error = VOP_FSYNC(tvp, MNT_WAIT, curthread); 2147 if (error) 2148 goto out; 2149 2150 /* 2151 * If the tvp exists and is in use, sillyrename it before doing the 2152 * rename of the new file over it. 2153 * XXX Can't sillyrename a directory. 2154 */ 2155 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 2156 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 2157 vput(tvp); 2158 tvp = NULL; 2159 } 2160 2161 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen, 2162 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 2163 curthread); 2164 2165 if (error == 0 && NFS_ISV4(tdvp)) { 2166 /* 2167 * For NFSv4, check to see if it is the same name and 2168 * replace the name, if it is different. 2169 */ 2170 newv4 = malloc( 2171 sizeof (struct nfsv4node) + 2172 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1, 2173 M_NFSV4NODE, M_WAITOK); 2174 NFSLOCKNODE(tdnp); 2175 NFSLOCKNODE(fnp); 2176 if (fnp->n_v4 != NULL && fvp->v_type == VREG && 2177 (fnp->n_v4->n4_namelen != tcnp->cn_namelen || 2178 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4), 2179 tcnp->cn_namelen) || 2180 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen || 2181 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 2182 tdnp->n_fhp->nfh_len))) { 2183 free(fnp->n_v4, M_NFSV4NODE); 2184 fnp->n_v4 = newv4; 2185 newv4 = NULL; 2186 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len; 2187 fnp->n_v4->n4_namelen = tcnp->cn_namelen; 2188 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 2189 tdnp->n_fhp->nfh_len); 2190 NFSBCOPY(tcnp->cn_nameptr, 2191 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen); 2192 } 2193 NFSUNLOCKNODE(tdnp); 2194 NFSUNLOCKNODE(fnp); 2195 if (newv4 != NULL) 2196 free(newv4, M_NFSV4NODE); 2197 } 2198 2199 if (fvp->v_type == VDIR) { 2200 if (tvp != NULL && tvp->v_type == VDIR) 2201 cache_purge(tdvp); 2202 cache_purge(fdvp); 2203 } 2204 2205 out: 2206 if (tdvp == tvp) 2207 vrele(tdvp); 2208 else 2209 vput(tdvp); 2210 if (tvp) 2211 vput(tvp); 2212 vrele(fdvp); 2213 vrele(fvp); 2214 /* 2215 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 2216 */ 2217 if (error == ENOENT) 2218 error = 0; 2219 return (error); 2220 } 2221 2222 /* 2223 * nfs file rename rpc called from nfs_remove() above 2224 */ 2225 static int 2226 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp, 2227 struct sillyrename *sp) 2228 { 2229 2230 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen, 2231 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred, 2232 curthread)); 2233 } 2234 2235 /* 2236 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 2237 */ 2238 static int 2239 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr, 2240 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr, 2241 int tnamelen, struct ucred *cred, struct thread *td) 2242 { 2243 struct nfsvattr fnfsva, tnfsva; 2244 struct nfsnode *fdnp = VTONFS(fdvp); 2245 struct nfsnode *tdnp = VTONFS(tdvp); 2246 int error = 0, fattrflag, tattrflag; 2247 2248 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp, 2249 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag, 2250 &tattrflag); 2251 NFSLOCKNODE(fdnp); 2252 fdnp->n_flag |= NMODIFIED; 2253 if (fattrflag != 0) { 2254 NFSUNLOCKNODE(fdnp); 2255 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, 0, 1); 2256 } else { 2257 fdnp->n_attrstamp = 0; 2258 NFSUNLOCKNODE(fdnp); 2259 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 2260 } 2261 NFSLOCKNODE(tdnp); 2262 tdnp->n_flag |= NMODIFIED; 2263 if (tattrflag != 0) { 2264 NFSUNLOCKNODE(tdnp); 2265 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, 0, 1); 2266 } else { 2267 tdnp->n_attrstamp = 0; 2268 NFSUNLOCKNODE(tdnp); 2269 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2270 } 2271 if (error && NFS_ISV4(fdvp)) 2272 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2273 return (error); 2274 } 2275 2276 /* 2277 * nfs hard link create call 2278 */ 2279 static int 2280 nfs_link(struct vop_link_args *ap) 2281 { 2282 struct vnode *vp = ap->a_vp; 2283 struct vnode *tdvp = ap->a_tdvp; 2284 struct componentname *cnp = ap->a_cnp; 2285 struct nfsnode *np, *tdnp; 2286 struct nfsvattr nfsva, dnfsva; 2287 int error = 0, attrflag, dattrflag; 2288 2289 /* 2290 * Push all writes to the server, so that the attribute cache 2291 * doesn't get "out of sync" with the server. 2292 * XXX There should be a better way! 2293 */ 2294 VOP_FSYNC(vp, MNT_WAIT, curthread); 2295 2296 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 2297 cnp->cn_cred, curthread, &dnfsva, &nfsva, &attrflag, &dattrflag); 2298 tdnp = VTONFS(tdvp); 2299 NFSLOCKNODE(tdnp); 2300 tdnp->n_flag |= NMODIFIED; 2301 if (dattrflag != 0) { 2302 NFSUNLOCKNODE(tdnp); 2303 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, 0, 1); 2304 } else { 2305 tdnp->n_attrstamp = 0; 2306 NFSUNLOCKNODE(tdnp); 2307 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2308 } 2309 if (attrflag) 2310 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 2311 else { 2312 np = VTONFS(vp); 2313 NFSLOCKNODE(np); 2314 np->n_attrstamp = 0; 2315 NFSUNLOCKNODE(np); 2316 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 2317 } 2318 /* 2319 * If negative lookup caching is enabled, I might as well 2320 * add an entry for this node. Not necessary for correctness, 2321 * but if negative caching is enabled, then the system 2322 * must care about lookup caching hit rate, so... 2323 */ 2324 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 && 2325 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2326 if (tdvp != vp) 2327 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL); 2328 else 2329 printf("nfs_link: bogus NFS server returned " 2330 "the directory as the new link\n"); 2331 } 2332 if (error && NFS_ISV4(vp)) 2333 error = nfscl_maperr(curthread, error, (uid_t)0, 2334 (gid_t)0); 2335 return (error); 2336 } 2337 2338 /* 2339 * nfs symbolic link create call 2340 */ 2341 static int 2342 nfs_symlink(struct vop_symlink_args *ap) 2343 { 2344 struct vnode *dvp = ap->a_dvp; 2345 struct vattr *vap = ap->a_vap; 2346 struct componentname *cnp = ap->a_cnp; 2347 struct nfsvattr nfsva, dnfsva; 2348 struct nfsfh *nfhp; 2349 struct nfsnode *np = NULL, *dnp; 2350 struct vnode *newvp = NULL; 2351 int error = 0, attrflag, dattrflag, ret; 2352 2353 vap->va_type = VLNK; 2354 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2355 ap->a_target, vap, cnp->cn_cred, curthread, &dnfsva, 2356 &nfsva, &nfhp, &attrflag, &dattrflag); 2357 if (nfhp) { 2358 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread, 2359 &np, LK_EXCLUSIVE); 2360 if (!ret) 2361 newvp = NFSTOV(np); 2362 else if (!error) 2363 error = ret; 2364 } 2365 if (newvp != NULL) { 2366 if (attrflag) 2367 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 2368 } else if (!error) { 2369 /* 2370 * If we do not have an error and we could not extract the 2371 * newvp from the response due to the request being NFSv2, we 2372 * have to do a lookup in order to obtain a newvp to return. 2373 */ 2374 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2375 cnp->cn_cred, curthread, &np); 2376 if (!error) 2377 newvp = NFSTOV(np); 2378 } 2379 if (error) { 2380 if (newvp) 2381 vput(newvp); 2382 if (NFS_ISV4(dvp)) 2383 error = nfscl_maperr(curthread, error, 2384 vap->va_uid, vap->va_gid); 2385 } else { 2386 *ap->a_vpp = newvp; 2387 } 2388 2389 dnp = VTONFS(dvp); 2390 NFSLOCKNODE(dnp); 2391 dnp->n_flag |= NMODIFIED; 2392 if (dattrflag != 0) { 2393 NFSUNLOCKNODE(dnp); 2394 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 2395 } else { 2396 dnp->n_attrstamp = 0; 2397 NFSUNLOCKNODE(dnp); 2398 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2399 } 2400 /* 2401 * If negative lookup caching is enabled, I might as well 2402 * add an entry for this node. Not necessary for correctness, 2403 * but if negative caching is enabled, then the system 2404 * must care about lookup caching hit rate, so... 2405 */ 2406 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2407 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2408 if (dvp != newvp) 2409 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 2410 NULL); 2411 else 2412 printf("nfs_symlink: bogus NFS server returned " 2413 "the directory as the new file object\n"); 2414 } 2415 return (error); 2416 } 2417 2418 /* 2419 * nfs make dir call 2420 */ 2421 static int 2422 nfs_mkdir(struct vop_mkdir_args *ap) 2423 { 2424 struct vnode *dvp = ap->a_dvp; 2425 struct vattr *vap = ap->a_vap; 2426 struct componentname *cnp = ap->a_cnp; 2427 struct nfsnode *np = NULL, *dnp; 2428 struct vnode *newvp = NULL; 2429 struct vattr vattr; 2430 struct nfsfh *nfhp; 2431 struct nfsvattr nfsva, dnfsva; 2432 int error = 0, attrflag, dattrflag, ret; 2433 2434 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2435 return (error); 2436 vap->va_type = VDIR; 2437 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2438 vap, cnp->cn_cred, curthread, &dnfsva, &nfsva, &nfhp, 2439 &attrflag, &dattrflag); 2440 dnp = VTONFS(dvp); 2441 NFSLOCKNODE(dnp); 2442 dnp->n_flag |= NMODIFIED; 2443 if (dattrflag != 0) { 2444 NFSUNLOCKNODE(dnp); 2445 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 2446 } else { 2447 dnp->n_attrstamp = 0; 2448 NFSUNLOCKNODE(dnp); 2449 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2450 } 2451 if (nfhp) { 2452 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread, 2453 &np, LK_EXCLUSIVE); 2454 if (!ret) { 2455 newvp = NFSTOV(np); 2456 if (attrflag) 2457 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 2458 0, 1); 2459 } else if (!error) 2460 error = ret; 2461 } 2462 if (!error && newvp == NULL) { 2463 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2464 cnp->cn_cred, curthread, &np); 2465 if (!error) { 2466 newvp = NFSTOV(np); 2467 if (newvp->v_type != VDIR) 2468 error = EEXIST; 2469 } 2470 } 2471 if (error) { 2472 if (newvp) 2473 vput(newvp); 2474 if (NFS_ISV4(dvp)) 2475 error = nfscl_maperr(curthread, error, 2476 vap->va_uid, vap->va_gid); 2477 } else { 2478 /* 2479 * If negative lookup caching is enabled, I might as well 2480 * add an entry for this node. Not necessary for correctness, 2481 * but if negative caching is enabled, then the system 2482 * must care about lookup caching hit rate, so... 2483 */ 2484 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2485 (cnp->cn_flags & MAKEENTRY) && 2486 attrflag != 0 && dattrflag != 0) { 2487 if (dvp != newvp) 2488 cache_enter_time(dvp, newvp, cnp, 2489 &nfsva.na_ctime, &dnfsva.na_ctime); 2490 else 2491 printf("nfs_mkdir: bogus NFS server returned " 2492 "the directory that the directory was " 2493 "created in as the new file object\n"); 2494 } 2495 *ap->a_vpp = newvp; 2496 } 2497 return (error); 2498 } 2499 2500 /* 2501 * nfs remove directory call 2502 */ 2503 static int 2504 nfs_rmdir(struct vop_rmdir_args *ap) 2505 { 2506 struct vnode *vp = ap->a_vp; 2507 struct vnode *dvp = ap->a_dvp; 2508 struct componentname *cnp = ap->a_cnp; 2509 struct nfsnode *dnp; 2510 struct nfsvattr dnfsva; 2511 int error, dattrflag; 2512 2513 if (dvp == vp) 2514 return (EINVAL); 2515 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2516 cnp->cn_cred, curthread, &dnfsva, &dattrflag); 2517 dnp = VTONFS(dvp); 2518 NFSLOCKNODE(dnp); 2519 dnp->n_flag |= NMODIFIED; 2520 if (dattrflag != 0) { 2521 NFSUNLOCKNODE(dnp); 2522 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 2523 } else { 2524 dnp->n_attrstamp = 0; 2525 NFSUNLOCKNODE(dnp); 2526 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2527 } 2528 2529 cache_purge(dvp); 2530 cache_purge(vp); 2531 if (error && NFS_ISV4(dvp)) 2532 error = nfscl_maperr(curthread, error, (uid_t)0, 2533 (gid_t)0); 2534 /* 2535 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2536 */ 2537 if (error == ENOENT) 2538 error = 0; 2539 return (error); 2540 } 2541 2542 /* 2543 * nfs readdir call 2544 */ 2545 static int 2546 nfs_readdir(struct vop_readdir_args *ap) 2547 { 2548 struct vnode *vp = ap->a_vp; 2549 struct nfsnode *np = VTONFS(vp); 2550 struct uio *uio = ap->a_uio; 2551 ssize_t tresid, left; 2552 int error = 0; 2553 struct vattr vattr; 2554 2555 if (ap->a_eofflag != NULL) 2556 *ap->a_eofflag = 0; 2557 if (vp->v_type != VDIR) 2558 return(EPERM); 2559 2560 /* 2561 * First, check for hit on the EOF offset cache 2562 */ 2563 NFSLOCKNODE(np); 2564 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2565 (np->n_flag & NMODIFIED) == 0) { 2566 NFSUNLOCKNODE(np); 2567 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2568 NFSLOCKNODE(np); 2569 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) || 2570 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2571 NFSUNLOCKNODE(np); 2572 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits); 2573 if (ap->a_eofflag != NULL) 2574 *ap->a_eofflag = 1; 2575 return (0); 2576 } else 2577 NFSUNLOCKNODE(np); 2578 } 2579 } else 2580 NFSUNLOCKNODE(np); 2581 2582 /* 2583 * NFS always guarantees that directory entries don't straddle 2584 * DIRBLKSIZ boundaries. As such, we need to limit the size 2585 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial 2586 * directory entry. 2587 */ 2588 left = uio->uio_resid % DIRBLKSIZ; 2589 if (left == uio->uio_resid) 2590 return (EINVAL); 2591 uio->uio_resid -= left; 2592 2593 /* 2594 * For readdirplus, if starting to read the directory, 2595 * purge the name cache, since it will be reloaded by 2596 * this directory read. 2597 * This removes potentially stale name cache entries. 2598 */ 2599 if (uio->uio_offset == 0 && 2600 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_RDIRPLUS) != 0) 2601 cache_purge(vp); 2602 2603 /* 2604 * Call ncl_bioread() to do the real work. 2605 */ 2606 tresid = uio->uio_resid; 2607 error = ncl_bioread(vp, uio, 0, ap->a_cred); 2608 2609 if (!error && uio->uio_resid == tresid) { 2610 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses); 2611 if (ap->a_eofflag != NULL) 2612 *ap->a_eofflag = 1; 2613 } 2614 2615 /* Add the partial DIRBLKSIZ (left) back in. */ 2616 uio->uio_resid += left; 2617 return (error); 2618 } 2619 2620 /* 2621 * Readdir rpc call. 2622 * Called from below the buffer cache by ncl_doio(). 2623 */ 2624 int 2625 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2626 struct thread *td) 2627 { 2628 struct nfsvattr nfsva; 2629 nfsuint64 *cookiep, cookie; 2630 struct nfsnode *dnp = VTONFS(vp); 2631 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2632 int error = 0, eof, attrflag; 2633 2634 KASSERT(uiop->uio_iovcnt == 1 && 2635 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2636 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2637 ("nfs readdirrpc bad uio")); 2638 2639 /* 2640 * If there is no cookie, assume directory was stale. 2641 */ 2642 ncl_dircookie_lock(dnp); 2643 NFSUNLOCKNODE(dnp); 2644 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2645 if (cookiep) { 2646 cookie = *cookiep; 2647 ncl_dircookie_unlock(dnp); 2648 } else { 2649 ncl_dircookie_unlock(dnp); 2650 return (NFSERR_BAD_COOKIE); 2651 } 2652 2653 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2654 (void)ncl_fsinfo(nmp, vp, cred, td); 2655 2656 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva, 2657 &attrflag, &eof); 2658 if (attrflag) 2659 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 2660 2661 if (!error) { 2662 /* 2663 * We are now either at the end of the directory or have filled 2664 * the block. 2665 */ 2666 if (eof) { 2667 NFSLOCKNODE(dnp); 2668 dnp->n_direofoffset = uiop->uio_offset; 2669 NFSUNLOCKNODE(dnp); 2670 } else { 2671 if (uiop->uio_resid > 0) 2672 printf("EEK! readdirrpc resid > 0\n"); 2673 ncl_dircookie_lock(dnp); 2674 NFSUNLOCKNODE(dnp); 2675 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2676 *cookiep = cookie; 2677 ncl_dircookie_unlock(dnp); 2678 } 2679 } else if (NFS_ISV4(vp)) { 2680 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2681 } 2682 return (error); 2683 } 2684 2685 /* 2686 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc(). 2687 */ 2688 int 2689 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2690 struct thread *td) 2691 { 2692 struct nfsvattr nfsva; 2693 nfsuint64 *cookiep, cookie; 2694 struct nfsnode *dnp = VTONFS(vp); 2695 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2696 int error = 0, attrflag, eof; 2697 2698 KASSERT(uiop->uio_iovcnt == 1 && 2699 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2700 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2701 ("nfs readdirplusrpc bad uio")); 2702 2703 /* 2704 * If there is no cookie, assume directory was stale. 2705 */ 2706 ncl_dircookie_lock(dnp); 2707 NFSUNLOCKNODE(dnp); 2708 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2709 if (cookiep) { 2710 cookie = *cookiep; 2711 ncl_dircookie_unlock(dnp); 2712 } else { 2713 ncl_dircookie_unlock(dnp); 2714 return (NFSERR_BAD_COOKIE); 2715 } 2716 2717 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2718 (void)ncl_fsinfo(nmp, vp, cred, td); 2719 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva, 2720 &attrflag, &eof); 2721 if (attrflag) 2722 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 2723 2724 if (!error) { 2725 /* 2726 * We are now either at end of the directory or have filled the 2727 * the block. 2728 */ 2729 if (eof) { 2730 NFSLOCKNODE(dnp); 2731 dnp->n_direofoffset = uiop->uio_offset; 2732 NFSUNLOCKNODE(dnp); 2733 } else { 2734 if (uiop->uio_resid > 0) 2735 printf("EEK! readdirplusrpc resid > 0\n"); 2736 ncl_dircookie_lock(dnp); 2737 NFSUNLOCKNODE(dnp); 2738 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2739 *cookiep = cookie; 2740 ncl_dircookie_unlock(dnp); 2741 } 2742 } else if (NFS_ISV4(vp)) { 2743 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2744 } 2745 return (error); 2746 } 2747 2748 /* 2749 * Silly rename. To make the NFS filesystem that is stateless look a little 2750 * more like the "ufs" a remove of an active vnode is translated to a rename 2751 * to a funny looking filename that is removed by nfs_inactive on the 2752 * nfsnode. There is the potential for another process on a different client 2753 * to create the same funny name between the nfs_lookitup() fails and the 2754 * nfs_rename() completes, but... 2755 */ 2756 static int 2757 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2758 { 2759 struct sillyrename *sp; 2760 struct nfsnode *np; 2761 int error; 2762 short pid; 2763 unsigned int lticks; 2764 2765 cache_purge(dvp); 2766 np = VTONFS(vp); 2767 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir")); 2768 sp = malloc(sizeof (struct sillyrename), 2769 M_NEWNFSREQ, M_WAITOK); 2770 sp->s_cred = crhold(cnp->cn_cred); 2771 sp->s_dvp = dvp; 2772 VREF(dvp); 2773 2774 /* 2775 * Fudge together a funny name. 2776 * Changing the format of the funny name to accommodate more 2777 * sillynames per directory. 2778 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2779 * CPU ticks since boot. 2780 */ 2781 pid = curthread->td_proc->p_pid; 2782 lticks = (unsigned int)ticks; 2783 for ( ; ; ) { 2784 sp->s_namlen = sprintf(sp->s_name, 2785 ".nfs.%08x.%04x4.4", lticks, 2786 pid); 2787 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2788 curthread, NULL)) 2789 break; 2790 lticks++; 2791 } 2792 error = nfs_renameit(dvp, vp, cnp, sp); 2793 if (error) 2794 goto bad; 2795 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2796 curthread, &np); 2797 np->n_sillyrename = sp; 2798 return (0); 2799 bad: 2800 vrele(sp->s_dvp); 2801 crfree(sp->s_cred); 2802 free(sp, M_NEWNFSREQ); 2803 return (error); 2804 } 2805 2806 /* 2807 * Look up a file name and optionally either update the file handle or 2808 * allocate an nfsnode, depending on the value of npp. 2809 * npp == NULL --> just do the lookup 2810 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2811 * handled too 2812 * *npp != NULL --> update the file handle in the vnode 2813 */ 2814 static int 2815 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred, 2816 struct thread *td, struct nfsnode **npp) 2817 { 2818 struct vnode *newvp = NULL, *vp; 2819 struct nfsnode *np, *dnp = VTONFS(dvp); 2820 struct nfsfh *nfhp, *onfhp; 2821 struct nfsvattr nfsva, dnfsva; 2822 struct componentname cn; 2823 int error = 0, attrflag, dattrflag; 2824 u_int hash; 2825 struct timespec ts; 2826 2827 nanouptime(&ts); 2828 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva, 2829 &nfhp, &attrflag, &dattrflag, 0); 2830 if (dattrflag) 2831 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 2832 if (npp && !error) { 2833 if (*npp != NULL) { 2834 np = *npp; 2835 vp = NFSTOV(np); 2836 /* 2837 * For NFSv4, check to see if it is the same name and 2838 * replace the name, if it is different. 2839 */ 2840 if (np->n_v4 != NULL && nfsva.na_type == VREG && 2841 (np->n_v4->n4_namelen != len || 2842 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) || 2843 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen || 2844 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2845 dnp->n_fhp->nfh_len))) { 2846 free(np->n_v4, M_NFSV4NODE); 2847 np->n_v4 = malloc( 2848 sizeof (struct nfsv4node) + 2849 dnp->n_fhp->nfh_len + len - 1, 2850 M_NFSV4NODE, M_WAITOK); 2851 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len; 2852 np->n_v4->n4_namelen = len; 2853 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2854 dnp->n_fhp->nfh_len); 2855 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len); 2856 } 2857 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, 2858 FNV1_32_INIT); 2859 onfhp = np->n_fhp; 2860 /* 2861 * Rehash node for new file handle. 2862 */ 2863 vfs_hash_rehash(vp, hash); 2864 np->n_fhp = nfhp; 2865 if (onfhp != NULL) 2866 free(onfhp, M_NFSFH); 2867 newvp = NFSTOV(np); 2868 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) { 2869 free(nfhp, M_NFSFH); 2870 VREF(dvp); 2871 newvp = dvp; 2872 } else { 2873 cn.cn_nameptr = name; 2874 cn.cn_namelen = len; 2875 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td, 2876 &np, LK_EXCLUSIVE); 2877 if (error) 2878 return (error); 2879 newvp = NFSTOV(np); 2880 /* 2881 * If n_localmodtime >= time before RPC, then 2882 * a file modification operation, such as 2883 * VOP_SETATTR() of size, has occurred while 2884 * the Lookup RPC and acquisition of the vnode 2885 * happened. As such, the attributes might 2886 * be stale, with possibly an incorrect size. 2887 */ 2888 NFSLOCKNODE(np); 2889 if (timespecisset(&np->n_localmodtime) && 2890 timespeccmp(&np->n_localmodtime, &ts, >=)) { 2891 NFSCL_DEBUG(4, "nfs_lookitup: localmod " 2892 "stale attributes\n"); 2893 attrflag = 0; 2894 } 2895 NFSUNLOCKNODE(np); 2896 } 2897 if (!attrflag && *npp == NULL) { 2898 if (newvp == dvp) 2899 vrele(newvp); 2900 else 2901 vput(newvp); 2902 return (ENOENT); 2903 } 2904 if (attrflag) 2905 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 2906 } 2907 if (npp && *npp == NULL) { 2908 if (error) { 2909 if (newvp) { 2910 if (newvp == dvp) 2911 vrele(newvp); 2912 else 2913 vput(newvp); 2914 } 2915 } else 2916 *npp = np; 2917 } 2918 if (error && NFS_ISV4(dvp)) 2919 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2920 return (error); 2921 } 2922 2923 /* 2924 * Nfs Version 3 and 4 commit rpc 2925 */ 2926 int 2927 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2928 struct thread *td) 2929 { 2930 struct nfsvattr nfsva; 2931 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2932 struct nfsnode *np; 2933 struct uio uio; 2934 int error, attrflag; 2935 2936 np = VTONFS(vp); 2937 error = EIO; 2938 attrflag = 0; 2939 if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) { 2940 uio.uio_offset = offset; 2941 uio.uio_resid = cnt; 2942 error = nfscl_doiods(vp, &uio, NULL, NULL, 2943 NFSV4OPEN_ACCESSWRITE, 1, cred, td); 2944 if (error != 0) { 2945 NFSLOCKNODE(np); 2946 np->n_flag &= ~NDSCOMMIT; 2947 NFSUNLOCKNODE(np); 2948 } 2949 } 2950 if (error != 0) { 2951 mtx_lock(&nmp->nm_mtx); 2952 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2953 mtx_unlock(&nmp->nm_mtx); 2954 return (0); 2955 } 2956 mtx_unlock(&nmp->nm_mtx); 2957 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva, 2958 &attrflag); 2959 } 2960 if (attrflag != 0) 2961 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 2962 if (error != 0 && NFS_ISV4(vp)) 2963 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2964 return (error); 2965 } 2966 2967 /* 2968 * Strategy routine. 2969 * For async requests when nfsiod(s) are running, queue the request by 2970 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the 2971 * request. 2972 */ 2973 static int 2974 nfs_strategy(struct vop_strategy_args *ap) 2975 { 2976 struct buf *bp; 2977 struct vnode *vp; 2978 struct ucred *cr; 2979 2980 bp = ap->a_bp; 2981 vp = ap->a_vp; 2982 KASSERT(bp->b_vp == vp, ("missing b_getvp")); 2983 KASSERT(!(bp->b_flags & B_DONE), 2984 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2985 2986 if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno) 2987 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize / 2988 DEV_BSIZE); 2989 if (bp->b_iocmd == BIO_READ) 2990 cr = bp->b_rcred; 2991 else 2992 cr = bp->b_wcred; 2993 2994 /* 2995 * If the op is asynchronous and an i/o daemon is waiting 2996 * queue the request, wake it up and wait for completion 2997 * otherwise just do it ourselves. 2998 */ 2999 if ((bp->b_flags & B_ASYNC) == 0 || 3000 ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread)) 3001 (void) ncl_doio(vp, bp, cr, curthread, 1); 3002 return (0); 3003 } 3004 3005 /* 3006 * fsync vnode op. Just call ncl_flush() with commit == 1. 3007 */ 3008 /* ARGSUSED */ 3009 static int 3010 nfs_fsync(struct vop_fsync_args *ap) 3011 { 3012 3013 if (ap->a_vp->v_type != VREG) { 3014 /* 3015 * For NFS, metadata is changed synchronously on the server, 3016 * so there is nothing to flush. Also, ncl_flush() clears 3017 * the NMODIFIED flag and that shouldn't be done here for 3018 * directories. 3019 */ 3020 return (0); 3021 } 3022 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0)); 3023 } 3024 3025 /* 3026 * Flush all the blocks associated with a vnode. 3027 * Walk through the buffer pool and push any dirty pages 3028 * associated with the vnode. 3029 * If the called_from_renewthread argument is TRUE, it has been called 3030 * from the NFSv4 renew thread and, as such, cannot block indefinitely 3031 * waiting for a buffer write to complete. 3032 */ 3033 int 3034 ncl_flush(struct vnode *vp, int waitfor, struct thread *td, 3035 int commit, int called_from_renewthread) 3036 { 3037 struct nfsnode *np = VTONFS(vp); 3038 struct buf *bp; 3039 int i; 3040 struct buf *nbp; 3041 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 3042 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 3043 int passone = 1, trycnt = 0; 3044 u_quad_t off, endoff, toff; 3045 struct ucred* wcred = NULL; 3046 struct buf **bvec = NULL; 3047 struct bufobj *bo; 3048 #ifndef NFS_COMMITBVECSIZ 3049 #define NFS_COMMITBVECSIZ 20 3050 #endif 3051 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 3052 u_int bvecsize = 0, bveccount; 3053 struct timespec ts; 3054 3055 if (called_from_renewthread != 0) 3056 slptimeo = hz; 3057 if (nmp->nm_flag & NFSMNT_INT) 3058 slpflag = PCATCH; 3059 if (!commit) 3060 passone = 0; 3061 bo = &vp->v_bufobj; 3062 /* 3063 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 3064 * server, but has not been committed to stable storage on the server 3065 * yet. On the first pass, the byte range is worked out and the commit 3066 * rpc is done. On the second pass, bwrite() is called to do the 3067 * job. 3068 */ 3069 again: 3070 off = (u_quad_t)-1; 3071 endoff = 0; 3072 bvecpos = 0; 3073 if (NFS_ISV34(vp) && commit) { 3074 if (bvec != NULL && bvec != bvec_on_stack) 3075 free(bvec, M_TEMP); 3076 /* 3077 * Count up how many buffers waiting for a commit. 3078 */ 3079 bveccount = 0; 3080 BO_LOCK(bo); 3081 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3082 if (!BUF_ISLOCKED(bp) && 3083 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 3084 == (B_DELWRI | B_NEEDCOMMIT)) 3085 bveccount++; 3086 } 3087 /* 3088 * Allocate space to remember the list of bufs to commit. It is 3089 * important to use M_NOWAIT here to avoid a race with nfs_write. 3090 * If we can't get memory (for whatever reason), we will end up 3091 * committing the buffers one-by-one in the loop below. 3092 */ 3093 if (bveccount > NFS_COMMITBVECSIZ) { 3094 /* 3095 * Release the vnode interlock to avoid a lock 3096 * order reversal. 3097 */ 3098 BO_UNLOCK(bo); 3099 bvec = (struct buf **) 3100 malloc(bveccount * sizeof(struct buf *), 3101 M_TEMP, M_NOWAIT); 3102 BO_LOCK(bo); 3103 if (bvec == NULL) { 3104 bvec = bvec_on_stack; 3105 bvecsize = NFS_COMMITBVECSIZ; 3106 } else 3107 bvecsize = bveccount; 3108 } else { 3109 bvec = bvec_on_stack; 3110 bvecsize = NFS_COMMITBVECSIZ; 3111 } 3112 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3113 if (bvecpos >= bvecsize) 3114 break; 3115 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3116 nbp = TAILQ_NEXT(bp, b_bobufs); 3117 continue; 3118 } 3119 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3120 (B_DELWRI | B_NEEDCOMMIT)) { 3121 BUF_UNLOCK(bp); 3122 nbp = TAILQ_NEXT(bp, b_bobufs); 3123 continue; 3124 } 3125 BO_UNLOCK(bo); 3126 bremfree(bp); 3127 /* 3128 * Work out if all buffers are using the same cred 3129 * so we can deal with them all with one commit. 3130 * 3131 * NOTE: we are not clearing B_DONE here, so we have 3132 * to do it later on in this routine if we intend to 3133 * initiate I/O on the bp. 3134 * 3135 * Note: to avoid loopback deadlocks, we do not 3136 * assign b_runningbufspace. 3137 */ 3138 if (wcred == NULL) 3139 wcred = bp->b_wcred; 3140 else if (wcred != bp->b_wcred) 3141 wcred = NOCRED; 3142 vfs_busy_pages(bp, 0); 3143 3144 BO_LOCK(bo); 3145 /* 3146 * bp is protected by being locked, but nbp is not 3147 * and vfs_busy_pages() may sleep. We have to 3148 * recalculate nbp. 3149 */ 3150 nbp = TAILQ_NEXT(bp, b_bobufs); 3151 3152 /* 3153 * A list of these buffers is kept so that the 3154 * second loop knows which buffers have actually 3155 * been committed. This is necessary, since there 3156 * may be a race between the commit rpc and new 3157 * uncommitted writes on the file. 3158 */ 3159 bvec[bvecpos++] = bp; 3160 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3161 bp->b_dirtyoff; 3162 if (toff < off) 3163 off = toff; 3164 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 3165 if (toff > endoff) 3166 endoff = toff; 3167 } 3168 BO_UNLOCK(bo); 3169 } 3170 if (bvecpos > 0) { 3171 /* 3172 * Commit data on the server, as required. 3173 * If all bufs are using the same wcred, then use that with 3174 * one call for all of them, otherwise commit each one 3175 * separately. 3176 */ 3177 if (wcred != NOCRED) 3178 retv = ncl_commit(vp, off, (int)(endoff - off), 3179 wcred, td); 3180 else { 3181 retv = 0; 3182 for (i = 0; i < bvecpos; i++) { 3183 off_t off, size; 3184 bp = bvec[i]; 3185 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3186 bp->b_dirtyoff; 3187 size = (u_quad_t)(bp->b_dirtyend 3188 - bp->b_dirtyoff); 3189 retv = ncl_commit(vp, off, (int)size, 3190 bp->b_wcred, td); 3191 if (retv) break; 3192 } 3193 } 3194 3195 if (retv == NFSERR_STALEWRITEVERF) 3196 ncl_clearcommit(vp->v_mount); 3197 3198 /* 3199 * Now, either mark the blocks I/O done or mark the 3200 * blocks dirty, depending on whether the commit 3201 * succeeded. 3202 */ 3203 for (i = 0; i < bvecpos; i++) { 3204 bp = bvec[i]; 3205 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3206 if (!NFSCL_FORCEDISM(vp->v_mount) && retv) { 3207 /* 3208 * Error, leave B_DELWRI intact 3209 */ 3210 vfs_unbusy_pages(bp); 3211 brelse(bp); 3212 } else { 3213 /* 3214 * Success, remove B_DELWRI ( bundirty() ). 3215 * 3216 * b_dirtyoff/b_dirtyend seem to be NFS 3217 * specific. We should probably move that 3218 * into bundirty(). XXX 3219 */ 3220 bufobj_wref(bo); 3221 bp->b_flags |= B_ASYNC; 3222 bundirty(bp); 3223 bp->b_flags &= ~B_DONE; 3224 bp->b_ioflags &= ~BIO_ERROR; 3225 bp->b_dirtyoff = bp->b_dirtyend = 0; 3226 bufdone(bp); 3227 } 3228 } 3229 } 3230 3231 /* 3232 * Start/do any write(s) that are required. 3233 */ 3234 loop: 3235 BO_LOCK(bo); 3236 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3237 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3238 if (waitfor != MNT_WAIT || passone) 3239 continue; 3240 3241 error = BUF_TIMELOCK(bp, 3242 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 3243 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo); 3244 if (error == 0) { 3245 BUF_UNLOCK(bp); 3246 goto loop; 3247 } 3248 if (error == ENOLCK) { 3249 error = 0; 3250 goto loop; 3251 } 3252 if (called_from_renewthread != 0) { 3253 /* 3254 * Return EIO so the flush will be retried 3255 * later. 3256 */ 3257 error = EIO; 3258 goto done; 3259 } 3260 if (newnfs_sigintr(nmp, td)) { 3261 error = EINTR; 3262 goto done; 3263 } 3264 if (slpflag == PCATCH) { 3265 slpflag = 0; 3266 slptimeo = 2 * hz; 3267 } 3268 goto loop; 3269 } 3270 if ((bp->b_flags & B_DELWRI) == 0) 3271 panic("nfs_fsync: not dirty"); 3272 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3273 BUF_UNLOCK(bp); 3274 continue; 3275 } 3276 BO_UNLOCK(bo); 3277 bremfree(bp); 3278 bp->b_flags |= B_ASYNC; 3279 bwrite(bp); 3280 if (newnfs_sigintr(nmp, td)) { 3281 error = EINTR; 3282 goto done; 3283 } 3284 goto loop; 3285 } 3286 if (passone) { 3287 passone = 0; 3288 BO_UNLOCK(bo); 3289 goto again; 3290 } 3291 if (waitfor == MNT_WAIT) { 3292 while (bo->bo_numoutput) { 3293 error = bufobj_wwait(bo, slpflag, slptimeo); 3294 if (error) { 3295 BO_UNLOCK(bo); 3296 if (called_from_renewthread != 0) { 3297 /* 3298 * Return EIO so that the flush will be 3299 * retried later. 3300 */ 3301 error = EIO; 3302 goto done; 3303 } 3304 error = newnfs_sigintr(nmp, td); 3305 if (error) 3306 goto done; 3307 if (slpflag == PCATCH) { 3308 slpflag = 0; 3309 slptimeo = 2 * hz; 3310 } 3311 BO_LOCK(bo); 3312 } 3313 } 3314 if (bo->bo_dirty.bv_cnt != 0 && commit) { 3315 BO_UNLOCK(bo); 3316 goto loop; 3317 } 3318 /* 3319 * Wait for all the async IO requests to drain 3320 */ 3321 BO_UNLOCK(bo); 3322 } else 3323 BO_UNLOCK(bo); 3324 if (NFSHASPNFS(nmp)) { 3325 nfscl_layoutcommit(vp, td); 3326 /* 3327 * Invalidate the attribute cache, since writes to a DS 3328 * won't update the size attribute. 3329 */ 3330 NFSLOCKNODE(np); 3331 np->n_attrstamp = 0; 3332 } else 3333 NFSLOCKNODE(np); 3334 if (np->n_flag & NWRITEERR) { 3335 error = np->n_error; 3336 np->n_flag &= ~NWRITEERR; 3337 } 3338 if (commit && bo->bo_dirty.bv_cnt == 0 && 3339 bo->bo_numoutput == 0) 3340 np->n_flag &= ~NMODIFIED; 3341 NFSUNLOCKNODE(np); 3342 done: 3343 if (bvec != NULL && bvec != bvec_on_stack) 3344 free(bvec, M_TEMP); 3345 if (error == 0 && commit != 0 && waitfor == MNT_WAIT && 3346 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0)) { 3347 if (trycnt++ < 5) { 3348 /* try, try again... */ 3349 passone = 1; 3350 wcred = NULL; 3351 bvec = NULL; 3352 bvecsize = 0; 3353 goto again; 3354 } 3355 vn_printf(vp, "ncl_flush failed"); 3356 error = called_from_renewthread != 0 ? EIO : EBUSY; 3357 } 3358 if (error == 0) { 3359 nanouptime(&ts); 3360 NFSLOCKNODE(np); 3361 np->n_localmodtime = ts; 3362 NFSUNLOCKNODE(np); 3363 } 3364 return (error); 3365 } 3366 3367 /* 3368 * NFS advisory byte-level locks. 3369 */ 3370 static int 3371 nfs_advlock(struct vop_advlock_args *ap) 3372 { 3373 struct vnode *vp = ap->a_vp; 3374 struct ucred *cred; 3375 struct nfsnode *np = VTONFS(ap->a_vp); 3376 struct proc *p = (struct proc *)ap->a_id; 3377 struct thread *td = curthread; /* XXX */ 3378 struct vattr va; 3379 int ret, error; 3380 u_quad_t size; 3381 struct nfsmount *nmp; 3382 3383 error = NFSVOPLOCK(vp, LK_SHARED); 3384 if (error != 0) 3385 return (EBADF); 3386 nmp = VFSTONFS(vp->v_mount); 3387 if (!NFS_ISV4(vp) || (nmp->nm_flag & NFSMNT_NOLOCKD) != 0) { 3388 if ((nmp->nm_flag & NFSMNT_NOLOCKD) != 0) { 3389 size = np->n_size; 3390 NFSVOPUNLOCK(vp); 3391 error = lf_advlock(ap, &(vp->v_lockf), size); 3392 } else { 3393 if (nfs_advlock_p != NULL) 3394 error = nfs_advlock_p(ap); 3395 else { 3396 NFSVOPUNLOCK(vp); 3397 error = ENOLCK; 3398 } 3399 } 3400 if (error == 0 && ap->a_op == F_SETLK) { 3401 error = NFSVOPLOCK(vp, LK_SHARED); 3402 if (error == 0) { 3403 /* Mark that a file lock has been acquired. */ 3404 NFSLOCKNODE(np); 3405 np->n_flag |= NHASBEENLOCKED; 3406 NFSUNLOCKNODE(np); 3407 NFSVOPUNLOCK(vp); 3408 } 3409 } 3410 return (error); 3411 } else if ((ap->a_flags & (F_POSIX | F_FLOCK)) != 0) { 3412 if (vp->v_type != VREG) { 3413 error = EINVAL; 3414 goto out; 3415 } 3416 if ((ap->a_flags & F_POSIX) != 0) 3417 cred = p->p_ucred; 3418 else 3419 cred = td->td_ucred; 3420 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 3421 if (VN_IS_DOOMED(vp)) { 3422 error = EBADF; 3423 goto out; 3424 } 3425 3426 /* 3427 * If this is unlocking a write locked region, flush and 3428 * commit them before unlocking. This is required by 3429 * RFC3530 Sec. 9.3.2. 3430 */ 3431 if (ap->a_op == F_UNLCK && 3432 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id, 3433 ap->a_flags)) 3434 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0); 3435 3436 /* 3437 * Mark NFS node as might have acquired a lock. 3438 * This is separate from NHASBEENLOCKED, because it must 3439 * be done before the nfsrpc_advlock() call, which might 3440 * add a nfscllock structure to the client state. 3441 * It is used to check for the case where a nfscllock 3442 * state structure cannot exist for the file. 3443 * Only done for "oneopenown" NFSv4.1/4.2 mounts. 3444 */ 3445 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp)) { 3446 NFSLOCKNODE(np); 3447 np->n_flag |= NMIGHTBELOCKED; 3448 NFSUNLOCKNODE(np); 3449 } 3450 3451 /* 3452 * Loop around doing the lock op, while a blocking lock 3453 * must wait for the lock op to succeed. 3454 */ 3455 do { 3456 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op, 3457 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags); 3458 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3459 ap->a_op == F_SETLK) { 3460 NFSVOPUNLOCK(vp); 3461 error = nfs_catnap(PZERO | PCATCH, ret, 3462 "ncladvl"); 3463 if (error) 3464 return (EINTR); 3465 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY); 3466 if (VN_IS_DOOMED(vp)) { 3467 error = EBADF; 3468 goto out; 3469 } 3470 } 3471 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3472 ap->a_op == F_SETLK); 3473 if (ret == NFSERR_DENIED) { 3474 error = EAGAIN; 3475 goto out; 3476 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) { 3477 error = ret; 3478 goto out; 3479 } else if (ret != 0) { 3480 error = EACCES; 3481 goto out; 3482 } 3483 3484 /* 3485 * Now, if we just got a lock, invalidate data in the buffer 3486 * cache, as required, so that the coherency conforms with 3487 * RFC3530 Sec. 9.3.2. 3488 */ 3489 if (ap->a_op == F_SETLK) { 3490 if ((np->n_flag & NMODIFIED) == 0) { 3491 np->n_attrstamp = 0; 3492 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3493 ret = VOP_GETATTR(vp, &va, cred); 3494 } 3495 if ((np->n_flag & NMODIFIED) || ret || 3496 np->n_change != va.va_filerev) { 3497 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1); 3498 np->n_attrstamp = 0; 3499 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3500 ret = VOP_GETATTR(vp, &va, cred); 3501 if (!ret) { 3502 np->n_mtime = va.va_mtime; 3503 np->n_change = va.va_filerev; 3504 } 3505 } 3506 /* Mark that a file lock has been acquired. */ 3507 NFSLOCKNODE(np); 3508 np->n_flag |= NHASBEENLOCKED; 3509 NFSUNLOCKNODE(np); 3510 } 3511 } else 3512 error = EOPNOTSUPP; 3513 out: 3514 NFSVOPUNLOCK(vp); 3515 return (error); 3516 } 3517 3518 /* 3519 * NFS advisory byte-level locks. 3520 */ 3521 static int 3522 nfs_advlockasync(struct vop_advlockasync_args *ap) 3523 { 3524 struct vnode *vp = ap->a_vp; 3525 u_quad_t size; 3526 int error; 3527 3528 error = NFSVOPLOCK(vp, LK_SHARED); 3529 if (error) 3530 return (error); 3531 if (NFS_ISV4(vp)) { 3532 NFSVOPUNLOCK(vp); 3533 return (EOPNOTSUPP); 3534 } 3535 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3536 size = VTONFS(vp)->n_size; 3537 NFSVOPUNLOCK(vp); 3538 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3539 } else { 3540 NFSVOPUNLOCK(vp); 3541 error = EOPNOTSUPP; 3542 } 3543 return (error); 3544 } 3545 3546 /* 3547 * Print out the contents of an nfsnode. 3548 */ 3549 static int 3550 nfs_print(struct vop_print_args *ap) 3551 { 3552 struct vnode *vp = ap->a_vp; 3553 struct nfsnode *np = VTONFS(vp); 3554 3555 printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid, 3556 (uintmax_t)np->n_vattr.na_fsid); 3557 if (vp->v_type == VFIFO) 3558 fifo_printinfo(vp); 3559 printf("\n"); 3560 return (0); 3561 } 3562 3563 /* 3564 * nfs special file access vnode op. 3565 * Essentially just get vattr and then imitate iaccess() since the device is 3566 * local to the client. 3567 */ 3568 static int 3569 nfsspec_access(struct vop_access_args *ap) 3570 { 3571 struct vattr *vap; 3572 struct ucred *cred = ap->a_cred; 3573 struct vnode *vp = ap->a_vp; 3574 accmode_t accmode = ap->a_accmode; 3575 struct vattr vattr; 3576 int error; 3577 3578 /* 3579 * Disallow write attempts on filesystems mounted read-only; 3580 * unless the file is a socket, fifo, or a block or character 3581 * device resident on the filesystem. 3582 */ 3583 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3584 switch (vp->v_type) { 3585 case VREG: 3586 case VDIR: 3587 case VLNK: 3588 return (EROFS); 3589 default: 3590 break; 3591 } 3592 } 3593 vap = &vattr; 3594 error = VOP_GETATTR(vp, vap, cred); 3595 if (error) 3596 goto out; 3597 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3598 accmode, cred); 3599 out: 3600 return error; 3601 } 3602 3603 /* 3604 * Read wrapper for fifos. 3605 */ 3606 static int 3607 nfsfifo_read(struct vop_read_args *ap) 3608 { 3609 struct nfsnode *np = VTONFS(ap->a_vp); 3610 int error; 3611 3612 /* 3613 * Set access flag. 3614 */ 3615 NFSLOCKNODE(np); 3616 np->n_flag |= NACC; 3617 vfs_timestamp(&np->n_atim); 3618 NFSUNLOCKNODE(np); 3619 error = fifo_specops.vop_read(ap); 3620 return error; 3621 } 3622 3623 /* 3624 * Write wrapper for fifos. 3625 */ 3626 static int 3627 nfsfifo_write(struct vop_write_args *ap) 3628 { 3629 struct nfsnode *np = VTONFS(ap->a_vp); 3630 3631 /* 3632 * Set update flag. 3633 */ 3634 NFSLOCKNODE(np); 3635 np->n_flag |= NUPD; 3636 vfs_timestamp(&np->n_mtim); 3637 NFSUNLOCKNODE(np); 3638 return(fifo_specops.vop_write(ap)); 3639 } 3640 3641 /* 3642 * Close wrapper for fifos. 3643 * 3644 * Update the times on the nfsnode then do fifo close. 3645 */ 3646 static int 3647 nfsfifo_close(struct vop_close_args *ap) 3648 { 3649 struct vnode *vp = ap->a_vp; 3650 struct nfsnode *np = VTONFS(vp); 3651 struct vattr vattr; 3652 struct timespec ts; 3653 3654 NFSLOCKNODE(np); 3655 if (np->n_flag & (NACC | NUPD)) { 3656 vfs_timestamp(&ts); 3657 if (np->n_flag & NACC) 3658 np->n_atim = ts; 3659 if (np->n_flag & NUPD) 3660 np->n_mtim = ts; 3661 np->n_flag |= NCHG; 3662 if (vrefcnt(vp) == 1 && 3663 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3664 VATTR_NULL(&vattr); 3665 if (np->n_flag & NACC) 3666 vattr.va_atime = np->n_atim; 3667 if (np->n_flag & NUPD) 3668 vattr.va_mtime = np->n_mtim; 3669 NFSUNLOCKNODE(np); 3670 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3671 goto out; 3672 } 3673 } 3674 NFSUNLOCKNODE(np); 3675 out: 3676 return (fifo_specops.vop_close(ap)); 3677 } 3678 3679 static int 3680 nfs_getacl(struct vop_getacl_args *ap) 3681 { 3682 int error; 3683 3684 if (ap->a_type != ACL_TYPE_NFS4) 3685 return (EOPNOTSUPP); 3686 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp); 3687 if (error > NFSERR_STALE) { 3688 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3689 error = EPERM; 3690 } 3691 return (error); 3692 } 3693 3694 static int 3695 nfs_setacl(struct vop_setacl_args *ap) 3696 { 3697 int error; 3698 3699 if (ap->a_type != ACL_TYPE_NFS4) 3700 return (EOPNOTSUPP); 3701 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp); 3702 if (error > NFSERR_STALE) { 3703 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3704 error = EPERM; 3705 } 3706 return (error); 3707 } 3708 3709 /* 3710 * VOP_ADVISE for NFS. 3711 * Just return 0 for any errors, since it is just a hint. 3712 */ 3713 static int 3714 nfs_advise(struct vop_advise_args *ap) 3715 { 3716 struct thread *td = curthread; 3717 struct nfsmount *nmp; 3718 uint64_t len; 3719 int error; 3720 3721 /* 3722 * First do vop_stdadvise() to handle the buffer cache. 3723 */ 3724 error = vop_stdadvise(ap); 3725 if (error != 0) 3726 return (error); 3727 if (ap->a_start < 0 || ap->a_end < 0) 3728 return (0); 3729 if (ap->a_end == OFF_MAX) 3730 len = 0; 3731 else if (ap->a_end < ap->a_start) 3732 return (0); 3733 else 3734 len = ap->a_end - ap->a_start + 1; 3735 nmp = VFSTONFS(ap->a_vp->v_mount); 3736 mtx_lock(&nmp->nm_mtx); 3737 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3738 (NFSHASPNFS(nmp) && (nmp->nm_privflag & NFSMNTP_IOADVISETHRUMDS) == 3739 0) || (nmp->nm_privflag & NFSMNTP_NOADVISE) != 0) { 3740 mtx_unlock(&nmp->nm_mtx); 3741 return (0); 3742 } 3743 mtx_unlock(&nmp->nm_mtx); 3744 error = nfsrpc_advise(ap->a_vp, ap->a_start, len, ap->a_advice, 3745 td->td_ucred, td); 3746 if (error == NFSERR_NOTSUPP) { 3747 mtx_lock(&nmp->nm_mtx); 3748 nmp->nm_privflag |= NFSMNTP_NOADVISE; 3749 mtx_unlock(&nmp->nm_mtx); 3750 } 3751 return (0); 3752 } 3753 3754 /* 3755 * nfs allocate call 3756 */ 3757 static int 3758 nfs_allocate(struct vop_allocate_args *ap) 3759 { 3760 struct vnode *vp = ap->a_vp; 3761 struct thread *td = curthread; 3762 struct nfsvattr nfsva; 3763 struct nfsmount *nmp; 3764 struct nfsnode *np; 3765 off_t alen; 3766 int attrflag, error, ret; 3767 struct timespec ts; 3768 struct uio io; 3769 3770 attrflag = 0; 3771 nmp = VFSTONFS(vp->v_mount); 3772 np = VTONFS(vp); 3773 mtx_lock(&nmp->nm_mtx); 3774 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION && 3775 (nmp->nm_privflag & NFSMNTP_NOALLOCATE) == 0) { 3776 mtx_unlock(&nmp->nm_mtx); 3777 alen = *ap->a_len; 3778 if ((uint64_t)alen > nfs_maxalloclen) 3779 alen = nfs_maxalloclen; 3780 3781 /* Check the file size limit. */ 3782 io.uio_offset = *ap->a_offset; 3783 io.uio_resid = alen; 3784 error = vn_rlimit_fsize(vp, &io, td); 3785 3786 /* 3787 * Flush first to ensure that the allocate adds to the 3788 * file's allocation on the server. 3789 */ 3790 if (error == 0) { 3791 vnode_pager_clean_sync(vp); 3792 error = ncl_flush(vp, MNT_WAIT, td, 1, 0); 3793 } 3794 if (error == 0) 3795 error = nfsrpc_allocate(vp, *ap->a_offset, alen, 3796 &nfsva, &attrflag, ap->a_cred, td); 3797 if (error == 0) { 3798 *ap->a_offset += alen; 3799 *ap->a_len -= alen; 3800 nanouptime(&ts); 3801 NFSLOCKNODE(np); 3802 np->n_localmodtime = ts; 3803 NFSUNLOCKNODE(np); 3804 } else if (error == NFSERR_NOTSUPP) { 3805 mtx_lock(&nmp->nm_mtx); 3806 nmp->nm_privflag |= NFSMNTP_NOALLOCATE; 3807 mtx_unlock(&nmp->nm_mtx); 3808 error = EINVAL; 3809 } 3810 } else { 3811 mtx_unlock(&nmp->nm_mtx); 3812 error = EINVAL; 3813 } 3814 if (attrflag != 0) { 3815 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 3816 if (error == 0 && ret != 0) 3817 error = ret; 3818 } 3819 if (error != 0) 3820 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 3821 return (error); 3822 } 3823 3824 /* 3825 * nfs deallocate call 3826 */ 3827 static int 3828 nfs_deallocate(struct vop_deallocate_args *ap) 3829 { 3830 struct vnode *vp = ap->a_vp; 3831 struct thread *td = curthread; 3832 struct nfsvattr nfsva; 3833 struct nfsmount *nmp; 3834 struct nfsnode *np; 3835 off_t tlen, mlen; 3836 int attrflag, error, ret; 3837 bool clipped; 3838 struct timespec ts; 3839 3840 error = 0; 3841 attrflag = 0; 3842 nmp = VFSTONFS(vp->v_mount); 3843 np = VTONFS(vp); 3844 mtx_lock(&nmp->nm_mtx); 3845 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION && 3846 (nmp->nm_privflag & NFSMNTP_NODEALLOCATE) == 0) { 3847 mtx_unlock(&nmp->nm_mtx); 3848 tlen = omin(OFF_MAX - *ap->a_offset, *ap->a_len); 3849 NFSCL_DEBUG(4, "dealloc: off=%jd len=%jd maxfilesize=%ju\n", 3850 (intmax_t)*ap->a_offset, (intmax_t)tlen, 3851 (uintmax_t)nmp->nm_maxfilesize); 3852 if ((uint64_t)*ap->a_offset >= nmp->nm_maxfilesize) { 3853 /* Avoid EFBIG error return from the NFSv4.2 server. */ 3854 *ap->a_len = 0; 3855 return (0); 3856 } 3857 clipped = false; 3858 if ((uint64_t)*ap->a_offset + tlen > nmp->nm_maxfilesize) 3859 tlen = nmp->nm_maxfilesize - *ap->a_offset; 3860 if ((uint64_t)*ap->a_offset < np->n_size) { 3861 /* Limit the len to nfs_maxalloclen before EOF. */ 3862 mlen = omin((off_t)np->n_size - *ap->a_offset, tlen); 3863 if ((uint64_t)mlen > nfs_maxalloclen) { 3864 NFSCL_DEBUG(4, "dealloc: tlen maxalloclen\n"); 3865 tlen = nfs_maxalloclen; 3866 clipped = true; 3867 } 3868 } 3869 if (error == 0) 3870 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 3871 if (error == 0) { 3872 vnode_pager_purge_range(vp, *ap->a_offset, 3873 *ap->a_offset + tlen); 3874 error = nfsrpc_deallocate(vp, *ap->a_offset, tlen, 3875 &nfsva, &attrflag, ap->a_cred, td); 3876 NFSCL_DEBUG(4, "dealloc: rpc=%d\n", error); 3877 } 3878 if (error == 0) { 3879 NFSCL_DEBUG(4, "dealloc: attrflag=%d na_size=%ju\n", 3880 attrflag, (uintmax_t)nfsva.na_size); 3881 nanouptime(&ts); 3882 NFSLOCKNODE(np); 3883 np->n_localmodtime = ts; 3884 NFSUNLOCKNODE(np); 3885 if (attrflag != 0) { 3886 if ((uint64_t)*ap->a_offset < nfsva.na_size) 3887 *ap->a_offset += omin((off_t) 3888 nfsva.na_size - *ap->a_offset, 3889 tlen); 3890 } 3891 if (clipped && tlen < *ap->a_len) 3892 *ap->a_len -= tlen; 3893 else 3894 *ap->a_len = 0; 3895 } else if (error == NFSERR_NOTSUPP) { 3896 mtx_lock(&nmp->nm_mtx); 3897 nmp->nm_privflag |= NFSMNTP_NODEALLOCATE; 3898 mtx_unlock(&nmp->nm_mtx); 3899 } 3900 } else { 3901 mtx_unlock(&nmp->nm_mtx); 3902 error = EIO; 3903 } 3904 /* 3905 * If the NFS server cannot perform the Deallocate operation, just call 3906 * vop_stddeallocate() to perform it. 3907 */ 3908 if (error != 0 && error != NFSERR_FBIG && error != NFSERR_INVAL) { 3909 error = vop_stddeallocate(ap); 3910 NFSCL_DEBUG(4, "dealloc: stddeallocate=%d\n", error); 3911 } 3912 if (attrflag != 0) { 3913 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 3914 if (error == 0 && ret != 0) 3915 error = ret; 3916 } 3917 if (error != 0) 3918 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 3919 return (error); 3920 } 3921 3922 /* 3923 * nfs copy_file_range call 3924 */ 3925 static int 3926 nfs_copy_file_range(struct vop_copy_file_range_args *ap) 3927 { 3928 struct vnode *invp = ap->a_invp; 3929 struct vnode *outvp = ap->a_outvp; 3930 struct mount *mp; 3931 vm_object_t invp_obj; 3932 struct nfsvattr innfsva, outnfsva; 3933 struct vattr va, *vap; 3934 struct uio io; 3935 struct nfsmount *nmp; 3936 size_t len, len2; 3937 ssize_t r; 3938 int error, inattrflag, outattrflag, ret, ret2, invp_lock; 3939 off_t inoff, outoff; 3940 bool consecutive, must_commit, tryoutcred; 3941 3942 /* 3943 * NFSv4.2 Copy is not permitted for infile == outfile. 3944 * TODO: copy_file_range() between multiple NFS mountpoints 3945 */ 3946 if (invp == outvp || invp->v_mount != outvp->v_mount) { 3947 generic_copy: 3948 return (ENOSYS); 3949 } 3950 3951 invp_lock = LK_SHARED; 3952 relock: 3953 3954 /* Lock both vnodes, avoiding risk of deadlock. */ 3955 do { 3956 mp = NULL; 3957 error = vn_start_write(outvp, &mp, V_WAIT); 3958 if (error == 0) { 3959 error = vn_lock(outvp, LK_EXCLUSIVE); 3960 if (error == 0) { 3961 error = vn_lock(invp, invp_lock | LK_NOWAIT); 3962 if (error == 0) 3963 break; 3964 VOP_UNLOCK(outvp); 3965 if (mp != NULL) 3966 vn_finished_write(mp); 3967 mp = NULL; 3968 error = vn_lock(invp, invp_lock); 3969 if (error == 0) 3970 VOP_UNLOCK(invp); 3971 } 3972 } 3973 if (mp != NULL) 3974 vn_finished_write(mp); 3975 } while (error == 0); 3976 if (error != 0) 3977 return (error); 3978 3979 /* 3980 * More reasons to avoid nfs copy: not NFSv4.2, or explicitly 3981 * disabled. 3982 */ 3983 nmp = VFSTONFS(invp->v_mount); 3984 mtx_lock(&nmp->nm_mtx); 3985 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3986 (nmp->nm_privflag & NFSMNTP_NOCOPY) != 0) { 3987 mtx_unlock(&nmp->nm_mtx); 3988 VOP_UNLOCK(invp); 3989 VOP_UNLOCK(outvp); 3990 if (mp != NULL) 3991 vn_finished_write(mp); 3992 goto generic_copy; 3993 } 3994 mtx_unlock(&nmp->nm_mtx); 3995 3996 /* 3997 * Do the vn_rlimit_fsize() check. Should this be above the VOP layer? 3998 */ 3999 io.uio_offset = *ap->a_outoffp; 4000 io.uio_resid = *ap->a_lenp; 4001 error = vn_rlimit_fsizex(outvp, &io, 0, &r, ap->a_fsizetd); 4002 *ap->a_lenp = io.uio_resid; 4003 /* 4004 * No need to call vn_rlimit_fsizex_res before return, since the uio is 4005 * local. 4006 */ 4007 4008 /* 4009 * Flush the input file so that the data is up to date before 4010 * the copy. Flush writes for the output file so that they 4011 * do not overwrite the data copied to the output file by the Copy. 4012 * Set the commit argument for both flushes so that the data is on 4013 * stable storage before the Copy RPC. This is done in case the 4014 * server reboots during the Copy and needs to be redone. 4015 */ 4016 if (error == 0) { 4017 invp_obj = invp->v_object; 4018 if (invp_obj != NULL && vm_object_mightbedirty(invp_obj)) { 4019 if (invp_lock != LK_EXCLUSIVE) { 4020 invp_lock = LK_EXCLUSIVE; 4021 VOP_UNLOCK(invp); 4022 VOP_UNLOCK(outvp); 4023 if (mp != NULL) 4024 vn_finished_write(mp); 4025 goto relock; 4026 } 4027 vnode_pager_clean_sync(invp); 4028 } 4029 error = ncl_flush(invp, MNT_WAIT, curthread, 1, 0); 4030 } 4031 if (error == 0) 4032 error = ncl_vinvalbuf(outvp, V_SAVE, curthread, 0); 4033 4034 /* Do the actual NFSv4.2 RPC. */ 4035 ret = ret2 = 0; 4036 len = *ap->a_lenp; 4037 mtx_lock(&nmp->nm_mtx); 4038 if ((nmp->nm_privflag & NFSMNTP_NOCONSECUTIVE) == 0) 4039 consecutive = true; 4040 else 4041 consecutive = false; 4042 mtx_unlock(&nmp->nm_mtx); 4043 inoff = *ap->a_inoffp; 4044 outoff = *ap->a_outoffp; 4045 tryoutcred = true; 4046 must_commit = false; 4047 if (error == 0) { 4048 vap = &VTONFS(invp)->n_vattr.na_vattr; 4049 error = VOP_GETATTR(invp, vap, ap->a_incred); 4050 if (error == 0) { 4051 /* 4052 * Clip "len" at va_size so that RFC compliant servers 4053 * will not reply NFSERR_INVAL. 4054 * Setting "len == 0" for the RPC would be preferred, 4055 * but some Linux servers do not support that. 4056 * If the len is being set to 0, do a Setattr RPC to 4057 * set the server's atime. This behaviour was the 4058 * preferred one for the FreeBSD "collective". 4059 */ 4060 if (inoff >= vap->va_size) { 4061 *ap->a_lenp = len = 0; 4062 if ((nmp->nm_mountp->mnt_flag & MNT_NOATIME) == 4063 0) { 4064 VATTR_NULL(&va); 4065 va.va_atime.tv_sec = 0; 4066 va.va_atime.tv_nsec = 0; 4067 va.va_vaflags = VA_UTIMES_NULL; 4068 inattrflag = 0; 4069 error = nfsrpc_setattr(invp, &va, NULL, 4070 ap->a_incred, curthread, &innfsva, 4071 &inattrflag); 4072 if (inattrflag != 0) 4073 ret = nfscl_loadattrcache(&invp, 4074 &innfsva, NULL, 0, 1); 4075 if (error == 0 && ret != 0) 4076 error = ret; 4077 } 4078 } else if (inoff + len > vap->va_size) 4079 *ap->a_lenp = len = vap->va_size - inoff; 4080 } else 4081 error = 0; 4082 } 4083 4084 /* 4085 * len will be set to 0 upon a successful Copy RPC. 4086 * As such, this only loops when the Copy RPC needs to be retried. 4087 */ 4088 while (len > 0 && error == 0) { 4089 inattrflag = outattrflag = 0; 4090 len2 = len; 4091 if (tryoutcred) 4092 error = nfsrpc_copy_file_range(invp, ap->a_inoffp, 4093 outvp, ap->a_outoffp, &len2, ap->a_flags, 4094 &inattrflag, &innfsva, &outattrflag, &outnfsva, 4095 ap->a_outcred, consecutive, &must_commit); 4096 else 4097 error = nfsrpc_copy_file_range(invp, ap->a_inoffp, 4098 outvp, ap->a_outoffp, &len2, ap->a_flags, 4099 &inattrflag, &innfsva, &outattrflag, &outnfsva, 4100 ap->a_incred, consecutive, &must_commit); 4101 if (inattrflag != 0) 4102 ret = nfscl_loadattrcache(&invp, &innfsva, NULL, 0, 1); 4103 if (outattrflag != 0) 4104 ret2 = nfscl_loadattrcache(&outvp, &outnfsva, NULL, 4105 1, 1); 4106 if (error == 0) { 4107 if (consecutive == false) { 4108 if (len2 == len) { 4109 mtx_lock(&nmp->nm_mtx); 4110 nmp->nm_privflag |= 4111 NFSMNTP_NOCONSECUTIVE; 4112 mtx_unlock(&nmp->nm_mtx); 4113 } else 4114 error = NFSERR_OFFLOADNOREQS; 4115 } 4116 *ap->a_lenp = len2; 4117 len = 0; 4118 if (len2 > 0 && must_commit && error == 0) 4119 error = ncl_commit(outvp, outoff, *ap->a_lenp, 4120 ap->a_outcred, curthread); 4121 if (error == 0 && ret != 0) 4122 error = ret; 4123 if (error == 0 && ret2 != 0) 4124 error = ret2; 4125 } else if (error == NFSERR_OFFLOADNOREQS && consecutive) { 4126 /* 4127 * Try consecutive == false, which is ok only if all 4128 * bytes are copied. 4129 * If only some bytes were copied when consecutive 4130 * is false, there is no way to know which bytes 4131 * still need to be written. 4132 */ 4133 consecutive = false; 4134 error = 0; 4135 } else if (error == NFSERR_ACCES && tryoutcred) { 4136 /* Try again with incred. */ 4137 tryoutcred = false; 4138 error = 0; 4139 } 4140 if (error == NFSERR_STALEWRITEVERF) { 4141 /* 4142 * Server rebooted, so do it all again. 4143 */ 4144 *ap->a_inoffp = inoff; 4145 *ap->a_outoffp = outoff; 4146 len = *ap->a_lenp; 4147 must_commit = false; 4148 error = 0; 4149 } 4150 } 4151 VOP_UNLOCK(invp); 4152 VOP_UNLOCK(outvp); 4153 if (mp != NULL) 4154 vn_finished_write(mp); 4155 if (error == NFSERR_NOTSUPP || error == NFSERR_OFFLOADNOREQS || 4156 error == NFSERR_ACCES) { 4157 /* 4158 * Unlike the NFSv4.2 Copy, vn_generic_copy_file_range() can 4159 * use a_incred for the read and a_outcred for the write, so 4160 * try this for NFSERR_ACCES failures for the Copy. 4161 * For NFSERR_NOTSUPP and NFSERR_OFFLOADNOREQS, the Copy can 4162 * never succeed, so disable it. 4163 */ 4164 if (error != NFSERR_ACCES) { 4165 /* Can never do Copy on this mount. */ 4166 mtx_lock(&nmp->nm_mtx); 4167 nmp->nm_privflag |= NFSMNTP_NOCOPY; 4168 mtx_unlock(&nmp->nm_mtx); 4169 } 4170 *ap->a_inoffp = inoff; 4171 *ap->a_outoffp = outoff; 4172 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 4173 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, 4174 ap->a_incred, ap->a_outcred, ap->a_fsizetd); 4175 } else if (error != 0) 4176 *ap->a_lenp = 0; 4177 4178 if (error != 0) 4179 error = nfscl_maperr(curthread, error, (uid_t)0, (gid_t)0); 4180 return (error); 4181 } 4182 4183 /* 4184 * nfs ioctl call 4185 */ 4186 static int 4187 nfs_ioctl(struct vop_ioctl_args *ap) 4188 { 4189 struct vnode *vp = ap->a_vp; 4190 struct nfsvattr nfsva; 4191 struct nfsmount *nmp; 4192 int attrflag, content, error, ret; 4193 bool eof = false; /* shut up compiler. */ 4194 4195 /* Do the actual NFSv4.2 RPC. */ 4196 switch (ap->a_command) { 4197 case FIOSEEKDATA: 4198 content = NFSV4CONTENT_DATA; 4199 break; 4200 case FIOSEEKHOLE: 4201 content = NFSV4CONTENT_HOLE; 4202 break; 4203 default: 4204 return (ENOTTY); 4205 } 4206 4207 error = vn_lock(vp, LK_EXCLUSIVE); 4208 if (error != 0) 4209 return (EBADF); 4210 4211 if (vp->v_type != VREG) { 4212 VOP_UNLOCK(vp); 4213 return (ENOTTY); 4214 } 4215 nmp = VFSTONFS(vp->v_mount); 4216 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) { 4217 VOP_UNLOCK(vp); 4218 error = vop_stdioctl(ap); 4219 return (error); 4220 } 4221 4222 attrflag = 0; 4223 if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size) 4224 error = ENXIO; 4225 else { 4226 /* 4227 * Flush all writes, so that the server is up to date. 4228 * Although a Commit is not required, the commit argument 4229 * is set so that, for a pNFS File/Flexible File Layout 4230 * server, the LayoutCommit will be done to ensure the file 4231 * size is up to date on the Metadata Server. 4232 */ 4233 4234 vnode_pager_clean_sync(vp); 4235 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0); 4236 if (error == 0) 4237 error = nfsrpc_seek(vp, (off_t *)ap->a_data, &eof, 4238 content, ap->a_cred, &nfsva, &attrflag); 4239 /* If at eof for FIOSEEKDATA, return ENXIO. */ 4240 if (eof && error == 0 && content == NFSV4CONTENT_DATA) 4241 error = ENXIO; 4242 } 4243 if (attrflag != 0) { 4244 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4245 if (error == 0 && ret != 0) 4246 error = ret; 4247 } 4248 NFSVOPUNLOCK(vp); 4249 4250 if (error != 0) 4251 error = ENXIO; 4252 return (error); 4253 } 4254 4255 /* 4256 * nfs getextattr call 4257 */ 4258 static int 4259 nfs_getextattr(struct vop_getextattr_args *ap) 4260 { 4261 struct vnode *vp = ap->a_vp; 4262 struct nfsmount *nmp; 4263 struct ucred *cred; 4264 struct thread *td = ap->a_td; 4265 struct nfsvattr nfsva; 4266 ssize_t len; 4267 int attrflag, error, ret; 4268 4269 nmp = VFSTONFS(vp->v_mount); 4270 mtx_lock(&nmp->nm_mtx); 4271 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4272 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4273 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4274 mtx_unlock(&nmp->nm_mtx); 4275 return (EOPNOTSUPP); 4276 } 4277 mtx_unlock(&nmp->nm_mtx); 4278 4279 cred = ap->a_cred; 4280 if (cred == NULL) 4281 cred = td->td_ucred; 4282 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4283 attrflag = 0; 4284 error = nfsrpc_getextattr(vp, ap->a_name, ap->a_uio, &len, &nfsva, 4285 &attrflag, cred, td); 4286 if (attrflag != 0) { 4287 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4288 if (error == 0 && ret != 0) 4289 error = ret; 4290 } 4291 if (error == 0 && ap->a_size != NULL) 4292 *ap->a_size = len; 4293 4294 switch (error) { 4295 case NFSERR_NOTSUPP: 4296 case NFSERR_OPILLEGAL: 4297 mtx_lock(&nmp->nm_mtx); 4298 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4299 mtx_unlock(&nmp->nm_mtx); 4300 error = EOPNOTSUPP; 4301 break; 4302 case NFSERR_NOXATTR: 4303 case NFSERR_XATTR2BIG: 4304 error = ENOATTR; 4305 break; 4306 default: 4307 error = nfscl_maperr(td, error, 0, 0); 4308 break; 4309 } 4310 return (error); 4311 } 4312 4313 /* 4314 * nfs setextattr call 4315 */ 4316 static int 4317 nfs_setextattr(struct vop_setextattr_args *ap) 4318 { 4319 struct vnode *vp = ap->a_vp; 4320 struct nfsmount *nmp; 4321 struct ucred *cred; 4322 struct thread *td = ap->a_td; 4323 struct nfsvattr nfsva; 4324 int attrflag, error, ret; 4325 4326 nmp = VFSTONFS(vp->v_mount); 4327 mtx_lock(&nmp->nm_mtx); 4328 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4329 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4330 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4331 mtx_unlock(&nmp->nm_mtx); 4332 return (EOPNOTSUPP); 4333 } 4334 mtx_unlock(&nmp->nm_mtx); 4335 4336 if (ap->a_uio->uio_resid < 0) 4337 return (EINVAL); 4338 cred = ap->a_cred; 4339 if (cred == NULL) 4340 cred = td->td_ucred; 4341 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4342 attrflag = 0; 4343 error = nfsrpc_setextattr(vp, ap->a_name, ap->a_uio, &nfsva, 4344 &attrflag, cred, td); 4345 if (attrflag != 0) { 4346 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4347 if (error == 0 && ret != 0) 4348 error = ret; 4349 } 4350 4351 switch (error) { 4352 case NFSERR_NOTSUPP: 4353 case NFSERR_OPILLEGAL: 4354 mtx_lock(&nmp->nm_mtx); 4355 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4356 mtx_unlock(&nmp->nm_mtx); 4357 error = EOPNOTSUPP; 4358 break; 4359 case NFSERR_NOXATTR: 4360 case NFSERR_XATTR2BIG: 4361 error = ENOATTR; 4362 break; 4363 default: 4364 error = nfscl_maperr(td, error, 0, 0); 4365 break; 4366 } 4367 return (error); 4368 } 4369 4370 /* 4371 * nfs listextattr call 4372 */ 4373 static int 4374 nfs_listextattr(struct vop_listextattr_args *ap) 4375 { 4376 struct vnode *vp = ap->a_vp; 4377 struct nfsmount *nmp; 4378 struct ucred *cred; 4379 struct thread *td = ap->a_td; 4380 struct nfsvattr nfsva; 4381 size_t len, len2; 4382 uint64_t cookie; 4383 int attrflag, error, ret; 4384 bool eof; 4385 4386 nmp = VFSTONFS(vp->v_mount); 4387 mtx_lock(&nmp->nm_mtx); 4388 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4389 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4390 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4391 mtx_unlock(&nmp->nm_mtx); 4392 return (EOPNOTSUPP); 4393 } 4394 mtx_unlock(&nmp->nm_mtx); 4395 4396 cred = ap->a_cred; 4397 if (cred == NULL) 4398 cred = td->td_ucred; 4399 4400 /* Loop around doing List Extended Attribute RPCs. */ 4401 eof = false; 4402 cookie = 0; 4403 len2 = 0; 4404 error = 0; 4405 while (!eof && error == 0) { 4406 len = nmp->nm_rsize; 4407 attrflag = 0; 4408 error = nfsrpc_listextattr(vp, &cookie, ap->a_uio, &len, &eof, 4409 &nfsva, &attrflag, cred, td); 4410 if (attrflag != 0) { 4411 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4412 if (error == 0 && ret != 0) 4413 error = ret; 4414 } 4415 if (error == 0) { 4416 len2 += len; 4417 if (len2 > SSIZE_MAX) 4418 error = ENOATTR; 4419 } 4420 } 4421 if (error == 0 && ap->a_size != NULL) 4422 *ap->a_size = len2; 4423 4424 switch (error) { 4425 case NFSERR_NOTSUPP: 4426 case NFSERR_OPILLEGAL: 4427 mtx_lock(&nmp->nm_mtx); 4428 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4429 mtx_unlock(&nmp->nm_mtx); 4430 error = EOPNOTSUPP; 4431 break; 4432 case NFSERR_NOXATTR: 4433 case NFSERR_XATTR2BIG: 4434 error = ENOATTR; 4435 break; 4436 default: 4437 error = nfscl_maperr(td, error, 0, 0); 4438 break; 4439 } 4440 return (error); 4441 } 4442 4443 /* 4444 * nfs setextattr call 4445 */ 4446 static int 4447 nfs_deleteextattr(struct vop_deleteextattr_args *ap) 4448 { 4449 struct vnode *vp = ap->a_vp; 4450 struct nfsmount *nmp; 4451 struct nfsvattr nfsva; 4452 int attrflag, error, ret; 4453 4454 nmp = VFSTONFS(vp->v_mount); 4455 mtx_lock(&nmp->nm_mtx); 4456 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4457 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4458 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4459 mtx_unlock(&nmp->nm_mtx); 4460 return (EOPNOTSUPP); 4461 } 4462 mtx_unlock(&nmp->nm_mtx); 4463 4464 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4465 attrflag = 0; 4466 error = nfsrpc_rmextattr(vp, ap->a_name, &nfsva, &attrflag, ap->a_cred, 4467 ap->a_td); 4468 if (attrflag != 0) { 4469 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4470 if (error == 0 && ret != 0) 4471 error = ret; 4472 } 4473 4474 switch (error) { 4475 case NFSERR_NOTSUPP: 4476 case NFSERR_OPILLEGAL: 4477 mtx_lock(&nmp->nm_mtx); 4478 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4479 mtx_unlock(&nmp->nm_mtx); 4480 error = EOPNOTSUPP; 4481 break; 4482 case NFSERR_NOXATTR: 4483 case NFSERR_XATTR2BIG: 4484 error = ENOATTR; 4485 break; 4486 default: 4487 error = nfscl_maperr(ap->a_td, error, 0, 0); 4488 break; 4489 } 4490 return (error); 4491 } 4492 4493 /* 4494 * Return POSIX pathconf information applicable to nfs filesystems. 4495 */ 4496 static int 4497 nfs_pathconf(struct vop_pathconf_args *ap) 4498 { 4499 struct nfsv3_pathconf pc; 4500 struct nfsvattr nfsva; 4501 struct vnode *vp = ap->a_vp; 4502 struct nfsmount *nmp; 4503 struct thread *td = curthread; 4504 off_t off; 4505 bool eof, has_namedattr, named_enabled; 4506 int attrflag, error; 4507 struct nfsnode *np; 4508 4509 nmp = VFSTONFS(vp->v_mount); 4510 np = VTONFS(vp); 4511 named_enabled = false; 4512 has_namedattr = false; 4513 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX || 4514 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED || 4515 ap->a_name == _PC_NO_TRUNC)) || 4516 (NFS_ISV4(vp) && (ap->a_name == _PC_ACL_NFS4 || 4517 ap->a_name == _PC_HAS_NAMEDATTR))) { 4518 /* 4519 * Since only the above 4 a_names are returned by the NFSv3 4520 * Pathconf RPC, there is no point in doing it for others. 4521 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can 4522 * be used for _PC_ACL_NFS4 and _PC_HAS_NAMEDATTR as well. 4523 */ 4524 error = nfsrpc_pathconf(vp, &pc, &has_namedattr, td->td_ucred, 4525 td, &nfsva, &attrflag); 4526 if (attrflag != 0) 4527 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4528 if (error != 0) 4529 return (error); 4530 } else if (NFS_ISV4(vp) && ap->a_name == _PC_NAMEDATTR_ENABLED && 4531 (np->n_flag & NNAMEDNOTSUPP) == 0) { 4532 struct nfsfh *nfhp; 4533 4534 error = nfsrpc_openattr(nmp, vp, np->n_fhp->nfh_fh, 4535 np->n_fhp->nfh_len, false, td->td_ucred, td, &nfsva, &nfhp, 4536 &attrflag); 4537 named_enabled = true; 4538 if (error == 0) { 4539 free(nfhp, M_NFSFH); 4540 } else if (error == NFSERR_NOTSUPP) { 4541 named_enabled = false; 4542 NFSLOCKNODE(np); 4543 np->n_flag |= NNAMEDNOTSUPP; 4544 NFSUNLOCKNODE(np); 4545 } 4546 error = 0; 4547 } else { 4548 /* 4549 * For NFSv2 (or NFSv3 when not one of the above 4 a_names), 4550 * just fake them. 4551 */ 4552 pc.pc_linkmax = NFS_LINK_MAX; 4553 pc.pc_namemax = NFS_MAXNAMLEN; 4554 pc.pc_notrunc = 1; 4555 pc.pc_chownrestricted = 1; 4556 pc.pc_caseinsensitive = 0; 4557 pc.pc_casepreserving = 1; 4558 error = 0; 4559 } 4560 switch (ap->a_name) { 4561 case _PC_LINK_MAX: 4562 #ifdef _LP64 4563 *ap->a_retval = pc.pc_linkmax; 4564 #else 4565 *ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax); 4566 #endif 4567 break; 4568 case _PC_NAME_MAX: 4569 *ap->a_retval = pc.pc_namemax; 4570 break; 4571 case _PC_PIPE_BUF: 4572 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 4573 *ap->a_retval = PIPE_BUF; 4574 else 4575 error = EINVAL; 4576 break; 4577 case _PC_CHOWN_RESTRICTED: 4578 *ap->a_retval = pc.pc_chownrestricted; 4579 break; 4580 case _PC_NO_TRUNC: 4581 *ap->a_retval = pc.pc_notrunc; 4582 break; 4583 case _PC_ACL_NFS4: 4584 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 && 4585 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL)) 4586 *ap->a_retval = 1; 4587 else 4588 *ap->a_retval = 0; 4589 break; 4590 case _PC_ACL_PATH_MAX: 4591 if (NFS_ISV4(vp)) 4592 *ap->a_retval = ACL_MAX_ENTRIES; 4593 else 4594 *ap->a_retval = 3; 4595 break; 4596 case _PC_PRIO_IO: 4597 *ap->a_retval = 0; 4598 break; 4599 case _PC_SYNC_IO: 4600 *ap->a_retval = 0; 4601 break; 4602 case _PC_ALLOC_SIZE_MIN: 4603 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize; 4604 break; 4605 case _PC_FILESIZEBITS: 4606 if (NFS_ISV34(vp)) 4607 *ap->a_retval = 64; 4608 else 4609 *ap->a_retval = 32; 4610 break; 4611 case _PC_REC_INCR_XFER_SIZE: 4612 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4613 break; 4614 case _PC_REC_MAX_XFER_SIZE: 4615 *ap->a_retval = -1; /* means ``unlimited'' */ 4616 break; 4617 case _PC_REC_MIN_XFER_SIZE: 4618 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4619 break; 4620 case _PC_REC_XFER_ALIGN: 4621 *ap->a_retval = PAGE_SIZE; 4622 break; 4623 case _PC_SYMLINK_MAX: 4624 *ap->a_retval = NFS_MAXPATHLEN; 4625 break; 4626 case _PC_MIN_HOLE_SIZE: 4627 /* Only some NFSv4.2 servers support Seek for Holes. */ 4628 *ap->a_retval = 0; 4629 if (NFS_ISV4(vp) && nmp->nm_minorvers == NFSV42_MINORVERSION) { 4630 /* 4631 * NFSv4.2 doesn't have an attribute for hole size, 4632 * so all we can do is see if the Seek operation is 4633 * supported and then use f_iosize as a "best guess". 4634 */ 4635 mtx_lock(&nmp->nm_mtx); 4636 if ((nmp->nm_privflag & NFSMNTP_SEEKTESTED) == 0) { 4637 mtx_unlock(&nmp->nm_mtx); 4638 off = 0; 4639 attrflag = 0; 4640 error = nfsrpc_seek(vp, &off, &eof, 4641 NFSV4CONTENT_HOLE, td->td_ucred, &nfsva, 4642 &attrflag); 4643 if (attrflag != 0) 4644 (void) nfscl_loadattrcache(&vp, &nfsva, 4645 NULL, 0, 1); 4646 mtx_lock(&nmp->nm_mtx); 4647 if (error == NFSERR_NOTSUPP) 4648 nmp->nm_privflag |= NFSMNTP_SEEKTESTED; 4649 else 4650 nmp->nm_privflag |= NFSMNTP_SEEKTESTED | 4651 NFSMNTP_SEEK; 4652 error = 0; 4653 } 4654 if ((nmp->nm_privflag & NFSMNTP_SEEK) != 0) 4655 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4656 mtx_unlock(&nmp->nm_mtx); 4657 } 4658 break; 4659 case _PC_NAMEDATTR_ENABLED: 4660 if (named_enabled) 4661 *ap->a_retval = 1; 4662 else 4663 *ap->a_retval = 0; 4664 break; 4665 case _PC_HAS_NAMEDATTR: 4666 if (has_namedattr) 4667 *ap->a_retval = 1; 4668 else 4669 *ap->a_retval = 0; 4670 break; 4671 4672 default: 4673 error = vop_stdpathconf(ap); 4674 break; 4675 } 4676 return (error); 4677 } 4678