1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from nfs_vnops.c 8.16 (Berkeley) 5/27/95 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 /* 41 * vnode op calls for Sun NFS version 2, 3 and 4 42 */ 43 44 #include "opt_inet.h" 45 46 #include <sys/param.h> 47 #include <sys/kernel.h> 48 #include <sys/systm.h> 49 #include <sys/resourcevar.h> 50 #include <sys/proc.h> 51 #include <sys/mount.h> 52 #include <sys/bio.h> 53 #include <sys/buf.h> 54 #include <sys/extattr.h> 55 #include <sys/filio.h> 56 #include <sys/jail.h> 57 #include <sys/malloc.h> 58 #include <sys/mbuf.h> 59 #include <sys/namei.h> 60 #include <sys/socket.h> 61 #include <sys/vnode.h> 62 #include <sys/dirent.h> 63 #include <sys/fcntl.h> 64 #include <sys/lockf.h> 65 #include <sys/stat.h> 66 #include <sys/sysctl.h> 67 #include <sys/signalvar.h> 68 69 #include <vm/vm.h> 70 #include <vm/vm_extern.h> 71 #include <vm/vm_object.h> 72 73 #include <fs/nfs/nfsport.h> 74 #include <fs/nfsclient/nfsnode.h> 75 #include <fs/nfsclient/nfsmount.h> 76 #include <fs/nfsclient/nfs.h> 77 #include <fs/nfsclient/nfs_kdtrace.h> 78 79 #include <net/if.h> 80 #include <netinet/in.h> 81 #include <netinet/in_var.h> 82 83 #include <nfs/nfs_lock.h> 84 85 #ifdef KDTRACE_HOOKS 86 #include <sys/dtrace_bsd.h> 87 88 dtrace_nfsclient_accesscache_flush_probe_func_t 89 dtrace_nfscl_accesscache_flush_done_probe; 90 uint32_t nfscl_accesscache_flush_done_id; 91 92 dtrace_nfsclient_accesscache_get_probe_func_t 93 dtrace_nfscl_accesscache_get_hit_probe, 94 dtrace_nfscl_accesscache_get_miss_probe; 95 uint32_t nfscl_accesscache_get_hit_id; 96 uint32_t nfscl_accesscache_get_miss_id; 97 98 dtrace_nfsclient_accesscache_load_probe_func_t 99 dtrace_nfscl_accesscache_load_done_probe; 100 uint32_t nfscl_accesscache_load_done_id; 101 #endif /* !KDTRACE_HOOKS */ 102 103 /* Defs */ 104 #define TRUE 1 105 #define FALSE 0 106 107 extern struct nfsstatsv1 nfsstatsv1; 108 extern int nfsrv_useacl; 109 extern int nfscl_debuglevel; 110 MALLOC_DECLARE(M_NEWNFSREQ); 111 112 static vop_read_t nfsfifo_read; 113 static vop_write_t nfsfifo_write; 114 static vop_close_t nfsfifo_close; 115 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *, 116 struct thread *); 117 static vop_lookup_t nfs_lookup; 118 static vop_create_t nfs_create; 119 static vop_mknod_t nfs_mknod; 120 static vop_open_t nfs_open; 121 static vop_pathconf_t nfs_pathconf; 122 static vop_close_t nfs_close; 123 static vop_access_t nfs_access; 124 static vop_getattr_t nfs_getattr; 125 static vop_setattr_t nfs_setattr; 126 static vop_read_t nfs_read; 127 static vop_fsync_t nfs_fsync; 128 static vop_remove_t nfs_remove; 129 static vop_link_t nfs_link; 130 static vop_rename_t nfs_rename; 131 static vop_mkdir_t nfs_mkdir; 132 static vop_rmdir_t nfs_rmdir; 133 static vop_symlink_t nfs_symlink; 134 static vop_readdir_t nfs_readdir; 135 static vop_strategy_t nfs_strategy; 136 static int nfs_lookitup(struct vnode *, char *, int, 137 struct ucred *, struct thread *, struct nfsnode **); 138 static int nfs_sillyrename(struct vnode *, struct vnode *, 139 struct componentname *); 140 static vop_access_t nfsspec_access; 141 static vop_readlink_t nfs_readlink; 142 static vop_print_t nfs_print; 143 static vop_advlock_t nfs_advlock; 144 static vop_advlockasync_t nfs_advlockasync; 145 static vop_getacl_t nfs_getacl; 146 static vop_setacl_t nfs_setacl; 147 static vop_advise_t nfs_advise; 148 static vop_allocate_t nfs_allocate; 149 static vop_deallocate_t nfs_deallocate; 150 static vop_copy_file_range_t nfs_copy_file_range; 151 static vop_ioctl_t nfs_ioctl; 152 static vop_getextattr_t nfs_getextattr; 153 static vop_setextattr_t nfs_setextattr; 154 static vop_listextattr_t nfs_listextattr; 155 static vop_deleteextattr_t nfs_deleteextattr; 156 static vop_lock1_t nfs_lock; 157 158 /* 159 * Global vfs data structures for nfs 160 */ 161 162 static struct vop_vector newnfs_vnodeops_nosig = { 163 .vop_default = &default_vnodeops, 164 .vop_access = nfs_access, 165 .vop_advlock = nfs_advlock, 166 .vop_advlockasync = nfs_advlockasync, 167 .vop_close = nfs_close, 168 .vop_create = nfs_create, 169 .vop_fsync = nfs_fsync, 170 .vop_getattr = nfs_getattr, 171 .vop_getpages = ncl_getpages, 172 .vop_putpages = ncl_putpages, 173 .vop_inactive = ncl_inactive, 174 .vop_link = nfs_link, 175 .vop_lock1 = nfs_lock, 176 .vop_lookup = nfs_lookup, 177 .vop_mkdir = nfs_mkdir, 178 .vop_mknod = nfs_mknod, 179 .vop_open = nfs_open, 180 .vop_pathconf = nfs_pathconf, 181 .vop_print = nfs_print, 182 .vop_read = nfs_read, 183 .vop_readdir = nfs_readdir, 184 .vop_readlink = nfs_readlink, 185 .vop_reclaim = ncl_reclaim, 186 .vop_remove = nfs_remove, 187 .vop_rename = nfs_rename, 188 .vop_rmdir = nfs_rmdir, 189 .vop_setattr = nfs_setattr, 190 .vop_strategy = nfs_strategy, 191 .vop_symlink = nfs_symlink, 192 .vop_write = ncl_write, 193 .vop_getacl = nfs_getacl, 194 .vop_setacl = nfs_setacl, 195 .vop_advise = nfs_advise, 196 .vop_allocate = nfs_allocate, 197 .vop_deallocate = nfs_deallocate, 198 .vop_copy_file_range = nfs_copy_file_range, 199 .vop_ioctl = nfs_ioctl, 200 .vop_getextattr = nfs_getextattr, 201 .vop_setextattr = nfs_setextattr, 202 .vop_listextattr = nfs_listextattr, 203 .vop_deleteextattr = nfs_deleteextattr, 204 }; 205 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops_nosig); 206 207 static int 208 nfs_vnodeops_bypass(struct vop_generic_args *a) 209 { 210 211 return (vop_sigdefer(&newnfs_vnodeops_nosig, a)); 212 } 213 214 struct vop_vector newnfs_vnodeops = { 215 .vop_default = &default_vnodeops, 216 .vop_bypass = nfs_vnodeops_bypass, 217 }; 218 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops); 219 220 static struct vop_vector newnfs_fifoops_nosig = { 221 .vop_default = &fifo_specops, 222 .vop_access = nfsspec_access, 223 .vop_close = nfsfifo_close, 224 .vop_fsync = nfs_fsync, 225 .vop_getattr = nfs_getattr, 226 .vop_inactive = ncl_inactive, 227 .vop_pathconf = nfs_pathconf, 228 .vop_print = nfs_print, 229 .vop_read = nfsfifo_read, 230 .vop_reclaim = ncl_reclaim, 231 .vop_setattr = nfs_setattr, 232 .vop_write = nfsfifo_write, 233 }; 234 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops_nosig); 235 236 static int 237 nfs_fifoops_bypass(struct vop_generic_args *a) 238 { 239 240 return (vop_sigdefer(&newnfs_fifoops_nosig, a)); 241 } 242 243 struct vop_vector newnfs_fifoops = { 244 .vop_default = &default_vnodeops, 245 .vop_bypass = nfs_fifoops_bypass, 246 }; 247 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops); 248 249 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 250 struct componentname *cnp, struct vattr *vap); 251 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 252 int namelen, struct ucred *cred, struct thread *td); 253 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, 254 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp, 255 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td); 256 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp, 257 struct componentname *scnp, struct sillyrename *sp); 258 259 /* 260 * Global variables 261 */ 262 SYSCTL_DECL(_vfs_nfs); 263 264 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 265 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 266 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 267 268 static int nfs_prime_access_cache = 0; 269 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW, 270 &nfs_prime_access_cache, 0, 271 "Prime NFS ACCESS cache when fetching attributes"); 272 273 static int newnfs_commit_on_close = 0; 274 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW, 275 &newnfs_commit_on_close, 0, "write+commit on close, else only write"); 276 277 static int nfs_clean_pages_on_close = 1; 278 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, 279 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); 280 281 int newnfs_directio_enable = 0; 282 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 283 &newnfs_directio_enable, 0, "Enable NFS directio"); 284 285 int nfs_keep_dirty_on_error; 286 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW, 287 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned"); 288 289 /* 290 * This sysctl allows other processes to mmap a file that has been opened 291 * O_DIRECT by a process. In general, having processes mmap the file while 292 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 293 * this by default to prevent DoS attacks - to prevent a malicious user from 294 * opening up files O_DIRECT preventing other users from mmap'ing these 295 * files. "Protected" environments where stricter consistency guarantees are 296 * required can disable this knob. The process that opened the file O_DIRECT 297 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 298 * meaningful. 299 */ 300 int newnfs_directio_allow_mmap = 1; 301 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 302 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 303 304 static uint64_t nfs_maxalloclen = 64 * 1024 * 1024; 305 SYSCTL_U64(_vfs_nfs, OID_AUTO, maxalloclen, CTLFLAG_RW, 306 &nfs_maxalloclen, 0, "NFS max allocate/deallocate length"); 307 308 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \ 309 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \ 310 | NFSACCESS_DELETE | NFSACCESS_LOOKUP) 311 312 /* 313 * SMP Locking Note : 314 * The list of locks after the description of the lock is the ordering 315 * of other locks acquired with the lock held. 316 * np->n_mtx : Protects the fields in the nfsnode. 317 VM Object Lock 318 VI_MTX (acquired indirectly) 319 * nmp->nm_mtx : Protects the fields in the nfsmount. 320 rep->r_mtx 321 * ncl_iod_mutex : Global lock, protects shared nfsiod state. 322 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. 323 nmp->nm_mtx 324 rep->r_mtx 325 * rep->r_mtx : Protects the fields in an nfsreq. 326 */ 327 328 static int 329 nfs_lock(struct vop_lock1_args *ap) 330 { 331 struct vnode *vp; 332 struct nfsnode *np; 333 u_quad_t nsize; 334 int error, lktype; 335 bool onfault; 336 337 vp = ap->a_vp; 338 lktype = ap->a_flags & LK_TYPE_MASK; 339 error = VOP_LOCK1_APV(&default_vnodeops, ap); 340 if (error != 0 || vp->v_op != &newnfs_vnodeops) 341 return (error); 342 np = VTONFS(vp); 343 if (np == NULL) 344 return (0); 345 NFSLOCKNODE(np); 346 if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED && 347 lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE && 348 lktype != LK_TRYUPGRADE)) { 349 NFSUNLOCKNODE(np); 350 return (0); 351 } 352 onfault = (ap->a_flags & LK_EATTR_MASK) == LK_NOWAIT && 353 (ap->a_flags & LK_INIT_MASK) == LK_CANRECURSE && 354 (lktype == LK_SHARED || lktype == LK_EXCLUSIVE); 355 if (onfault && vp->v_vnlock->lk_recurse == 0) { 356 /* 357 * Force retry in vm_fault(), to make the lock request 358 * sleepable, which allows us to piggy-back the 359 * sleepable call to vnode_pager_setsize(). 360 */ 361 NFSUNLOCKNODE(np); 362 VOP_UNLOCK(vp); 363 return (EBUSY); 364 } 365 if ((ap->a_flags & LK_NOWAIT) != 0 || 366 (lktype == LK_SHARED && vp->v_vnlock->lk_recurse > 0)) { 367 NFSUNLOCKNODE(np); 368 return (0); 369 } 370 if (lktype == LK_SHARED) { 371 NFSUNLOCKNODE(np); 372 VOP_UNLOCK(vp); 373 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 374 ap->a_flags |= LK_EXCLUSIVE; 375 error = VOP_LOCK1_APV(&default_vnodeops, ap); 376 if (error != 0 || vp->v_op != &newnfs_vnodeops) 377 return (error); 378 if (vp->v_data == NULL) 379 goto downgrade; 380 MPASS(vp->v_data == np); 381 NFSLOCKNODE(np); 382 if ((np->n_flag & NVNSETSZSKIP) == 0) { 383 NFSUNLOCKNODE(np); 384 goto downgrade; 385 } 386 } 387 np->n_flag &= ~NVNSETSZSKIP; 388 nsize = np->n_size; 389 NFSUNLOCKNODE(np); 390 vnode_pager_setsize(vp, nsize); 391 downgrade: 392 if (lktype == LK_SHARED) { 393 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 394 ap->a_flags |= LK_DOWNGRADE; 395 (void)VOP_LOCK1_APV(&default_vnodeops, ap); 396 } 397 return (0); 398 } 399 400 static int 401 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td, 402 struct ucred *cred, u_int32_t *retmode) 403 { 404 int error = 0, attrflag, i, lrupos; 405 u_int32_t rmode; 406 struct nfsnode *np = VTONFS(vp); 407 struct nfsvattr nfsva; 408 409 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag, 410 &rmode, NULL); 411 if (attrflag) 412 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 413 if (!error) { 414 lrupos = 0; 415 NFSLOCKNODE(np); 416 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 417 if (np->n_accesscache[i].uid == cred->cr_uid) { 418 np->n_accesscache[i].mode = rmode; 419 np->n_accesscache[i].stamp = time_second; 420 break; 421 } 422 if (i > 0 && np->n_accesscache[i].stamp < 423 np->n_accesscache[lrupos].stamp) 424 lrupos = i; 425 } 426 if (i == NFS_ACCESSCACHESIZE) { 427 np->n_accesscache[lrupos].uid = cred->cr_uid; 428 np->n_accesscache[lrupos].mode = rmode; 429 np->n_accesscache[lrupos].stamp = time_second; 430 } 431 NFSUNLOCKNODE(np); 432 if (retmode != NULL) 433 *retmode = rmode; 434 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0); 435 } else if (NFS_ISV4(vp)) { 436 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 437 } 438 #ifdef KDTRACE_HOOKS 439 if (error != 0) 440 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0, 441 error); 442 #endif 443 return (error); 444 } 445 446 /* 447 * nfs access vnode op. 448 * For nfs version 2, just return ok. File accesses may fail later. 449 * For nfs version 3, use the access rpc to check accessibility. If file modes 450 * are changed on the server, accesses might still fail later. 451 */ 452 static int 453 nfs_access(struct vop_access_args *ap) 454 { 455 struct vnode *vp = ap->a_vp; 456 int error = 0, i, gotahit; 457 u_int32_t mode, wmode, rmode; 458 int v34 = NFS_ISV34(vp); 459 struct nfsnode *np = VTONFS(vp); 460 461 /* 462 * Disallow write attempts on filesystems mounted read-only; 463 * unless the file is a socket, fifo, or a block or character 464 * device resident on the filesystem. 465 */ 466 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS | 467 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL | 468 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { 469 switch (vp->v_type) { 470 case VREG: 471 case VDIR: 472 case VLNK: 473 return (EROFS); 474 default: 475 break; 476 } 477 } 478 /* 479 * For nfs v3 or v4, check to see if we have done this recently, and if 480 * so return our cached result instead of making an ACCESS call. 481 * If not, do an access rpc, otherwise you are stuck emulating 482 * ufs_access() locally using the vattr. This may not be correct, 483 * since the server may apply other access criteria such as 484 * client uid-->server uid mapping that we do not know about. 485 */ 486 if (v34) { 487 if (ap->a_accmode & VREAD) 488 mode = NFSACCESS_READ; 489 else 490 mode = 0; 491 if (vp->v_type != VDIR) { 492 if (ap->a_accmode & VWRITE) 493 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 494 if (ap->a_accmode & VAPPEND) 495 mode |= NFSACCESS_EXTEND; 496 if (ap->a_accmode & VEXEC) 497 mode |= NFSACCESS_EXECUTE; 498 if (ap->a_accmode & VDELETE) 499 mode |= NFSACCESS_DELETE; 500 } else { 501 if (ap->a_accmode & VWRITE) 502 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 503 if (ap->a_accmode & VAPPEND) 504 mode |= NFSACCESS_EXTEND; 505 if (ap->a_accmode & VEXEC) 506 mode |= NFSACCESS_LOOKUP; 507 if (ap->a_accmode & VDELETE) 508 mode |= NFSACCESS_DELETE; 509 if (ap->a_accmode & VDELETE_CHILD) 510 mode |= NFSACCESS_MODIFY; 511 } 512 /* XXX safety belt, only make blanket request if caching */ 513 if (nfsaccess_cache_timeout > 0) { 514 wmode = NFSACCESS_READ | NFSACCESS_MODIFY | 515 NFSACCESS_EXTEND | NFSACCESS_EXECUTE | 516 NFSACCESS_DELETE | NFSACCESS_LOOKUP; 517 } else { 518 wmode = mode; 519 } 520 521 /* 522 * Does our cached result allow us to give a definite yes to 523 * this request? 524 */ 525 gotahit = 0; 526 NFSLOCKNODE(np); 527 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 528 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) { 529 if (time_second < (np->n_accesscache[i].stamp 530 + nfsaccess_cache_timeout) && 531 (np->n_accesscache[i].mode & mode) == mode) { 532 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits); 533 gotahit = 1; 534 } 535 break; 536 } 537 } 538 NFSUNLOCKNODE(np); 539 #ifdef KDTRACE_HOOKS 540 if (gotahit != 0) 541 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp, 542 ap->a_cred->cr_uid, mode); 543 else 544 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp, 545 ap->a_cred->cr_uid, mode); 546 #endif 547 if (gotahit == 0) { 548 /* 549 * Either a no, or a don't know. Go to the wire. 550 */ 551 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 552 error = nfs34_access_otw(vp, wmode, ap->a_td, 553 ap->a_cred, &rmode); 554 if (!error && 555 (rmode & mode) != mode) 556 error = EACCES; 557 } 558 return (error); 559 } else { 560 if ((error = nfsspec_access(ap)) != 0) { 561 return (error); 562 } 563 /* 564 * Attempt to prevent a mapped root from accessing a file 565 * which it shouldn't. We try to read a byte from the file 566 * if the user is root and the file is not zero length. 567 * After calling nfsspec_access, we should have the correct 568 * file size cached. 569 */ 570 NFSLOCKNODE(np); 571 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD) 572 && VTONFS(vp)->n_size > 0) { 573 struct iovec aiov; 574 struct uio auio; 575 char buf[1]; 576 577 NFSUNLOCKNODE(np); 578 aiov.iov_base = buf; 579 aiov.iov_len = 1; 580 auio.uio_iov = &aiov; 581 auio.uio_iovcnt = 1; 582 auio.uio_offset = 0; 583 auio.uio_resid = 1; 584 auio.uio_segflg = UIO_SYSSPACE; 585 auio.uio_rw = UIO_READ; 586 auio.uio_td = ap->a_td; 587 588 if (vp->v_type == VREG) 589 error = ncl_readrpc(vp, &auio, ap->a_cred); 590 else if (vp->v_type == VDIR) { 591 char* bp; 592 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 593 aiov.iov_base = bp; 594 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 595 error = ncl_readdirrpc(vp, &auio, ap->a_cred, 596 ap->a_td); 597 free(bp, M_TEMP); 598 } else if (vp->v_type == VLNK) 599 error = ncl_readlinkrpc(vp, &auio, ap->a_cred); 600 else 601 error = EACCES; 602 } else 603 NFSUNLOCKNODE(np); 604 return (error); 605 } 606 } 607 608 /* 609 * nfs open vnode op 610 * Check to see if the type is ok 611 * and that deletion is not in progress. 612 * For paged in text files, you will need to flush the page cache 613 * if consistency is lost. 614 */ 615 /* ARGSUSED */ 616 static int 617 nfs_open(struct vop_open_args *ap) 618 { 619 struct vnode *vp = ap->a_vp; 620 struct nfsnode *np = VTONFS(vp); 621 struct vattr vattr; 622 int error; 623 int fmode = ap->a_mode; 624 struct ucred *cred; 625 vm_object_t obj; 626 627 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 628 return (EOPNOTSUPP); 629 630 /* 631 * For NFSv4, we need to do the Open Op before cache validation, 632 * so that we conform to RFC3530 Sec. 9.3.1. 633 */ 634 if (NFS_ISV4(vp)) { 635 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td); 636 if (error) { 637 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 638 (gid_t)0); 639 return (error); 640 } 641 } 642 643 /* 644 * Now, if this Open will be doing reading, re-validate/flush the 645 * cache, so that Close/Open coherency is maintained. 646 */ 647 NFSLOCKNODE(np); 648 if (np->n_flag & NMODIFIED) { 649 NFSUNLOCKNODE(np); 650 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 651 if (error == EINTR || error == EIO) { 652 if (NFS_ISV4(vp)) 653 (void) nfsrpc_close(vp, 0, ap->a_td); 654 return (error); 655 } 656 NFSLOCKNODE(np); 657 np->n_attrstamp = 0; 658 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 659 if (vp->v_type == VDIR) 660 np->n_direofoffset = 0; 661 NFSUNLOCKNODE(np); 662 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 663 if (error) { 664 if (NFS_ISV4(vp)) 665 (void) nfsrpc_close(vp, 0, ap->a_td); 666 return (error); 667 } 668 NFSLOCKNODE(np); 669 np->n_mtime = vattr.va_mtime; 670 if (NFS_ISV4(vp)) 671 np->n_change = vattr.va_filerev; 672 } else { 673 NFSUNLOCKNODE(np); 674 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 675 if (error) { 676 if (NFS_ISV4(vp)) 677 (void) nfsrpc_close(vp, 0, ap->a_td); 678 return (error); 679 } 680 NFSLOCKNODE(np); 681 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) || 682 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 683 if (vp->v_type == VDIR) 684 np->n_direofoffset = 0; 685 NFSUNLOCKNODE(np); 686 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 687 if (error == EINTR || error == EIO) { 688 if (NFS_ISV4(vp)) 689 (void) nfsrpc_close(vp, 0, ap->a_td); 690 return (error); 691 } 692 NFSLOCKNODE(np); 693 np->n_mtime = vattr.va_mtime; 694 if (NFS_ISV4(vp)) 695 np->n_change = vattr.va_filerev; 696 } 697 } 698 699 /* 700 * If the object has >= 1 O_DIRECT active opens, we disable caching. 701 */ 702 if (newnfs_directio_enable && (fmode & O_DIRECT) && 703 (vp->v_type == VREG)) { 704 if (np->n_directio_opens == 0) { 705 NFSUNLOCKNODE(np); 706 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 707 if (error) { 708 if (NFS_ISV4(vp)) 709 (void) nfsrpc_close(vp, 0, ap->a_td); 710 return (error); 711 } 712 NFSLOCKNODE(np); 713 np->n_flag |= NNONCACHE; 714 } 715 np->n_directio_opens++; 716 } 717 718 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */ 719 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0) 720 np->n_flag |= NWRITEOPENED; 721 722 /* 723 * If this is an open for writing, capture a reference to the 724 * credentials, so they can be used by ncl_putpages(). Using 725 * these write credentials is preferable to the credentials of 726 * whatever thread happens to be doing the VOP_PUTPAGES() since 727 * the write RPCs are less likely to fail with EACCES. 728 */ 729 if ((fmode & FWRITE) != 0) { 730 cred = np->n_writecred; 731 np->n_writecred = crhold(ap->a_cred); 732 } else 733 cred = NULL; 734 NFSUNLOCKNODE(np); 735 736 if (cred != NULL) 737 crfree(cred); 738 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 739 740 /* 741 * If the text file has been mmap'd, flush any dirty pages to the 742 * buffer cache and then... 743 * Make sure all writes are pushed to the NFS server. If this is not 744 * done, the modify time of the file can change while the text 745 * file is being executed. This will cause the process that is 746 * executing the text file to be terminated. 747 */ 748 if (vp->v_writecount <= -1) { 749 if ((obj = vp->v_object) != NULL && 750 vm_object_mightbedirty(obj)) { 751 VM_OBJECT_WLOCK(obj); 752 vm_object_page_clean(obj, 0, 0, OBJPC_SYNC); 753 VM_OBJECT_WUNLOCK(obj); 754 } 755 756 /* Now, flush the buffer cache. */ 757 ncl_flush(vp, MNT_WAIT, curthread, 0, 0); 758 759 /* And, finally, make sure that n_mtime is up to date. */ 760 np = VTONFS(vp); 761 NFSLOCKNODE(np); 762 np->n_mtime = np->n_vattr.na_mtime; 763 NFSUNLOCKNODE(np); 764 } 765 return (0); 766 } 767 768 /* 769 * nfs close vnode op 770 * What an NFS client should do upon close after writing is a debatable issue. 771 * Most NFS clients push delayed writes to the server upon close, basically for 772 * two reasons: 773 * 1 - So that any write errors may be reported back to the client process 774 * doing the close system call. By far the two most likely errors are 775 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 776 * 2 - To put a worst case upper bound on cache inconsistency between 777 * multiple clients for the file. 778 * There is also a consistency problem for Version 2 of the protocol w.r.t. 779 * not being able to tell if other clients are writing a file concurrently, 780 * since there is no way of knowing if the changed modify time in the reply 781 * is only due to the write for this client. 782 * (NFS Version 3 provides weak cache consistency data in the reply that 783 * should be sufficient to detect and handle this case.) 784 * 785 * The current code does the following: 786 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 787 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 788 * or commit them (this satisfies 1 and 2 except for the 789 * case where the server crashes after this close but 790 * before the commit RPC, which is felt to be "good 791 * enough". Changing the last argument to ncl_flush() to 792 * a 1 would force a commit operation, if it is felt a 793 * commit is necessary now. 794 * for NFS Version 4 - flush the dirty buffers and commit them, if 795 * nfscl_mustflush() says this is necessary. 796 * It is necessary if there is no write delegation held, 797 * in order to satisfy open/close coherency. 798 * If the file isn't cached on local stable storage, 799 * it may be necessary in order to detect "out of space" 800 * errors from the server, if the write delegation 801 * issued by the server doesn't allow the file to grow. 802 */ 803 /* ARGSUSED */ 804 static int 805 nfs_close(struct vop_close_args *ap) 806 { 807 struct vnode *vp = ap->a_vp; 808 struct nfsnode *np = VTONFS(vp); 809 struct nfsvattr nfsva; 810 struct ucred *cred; 811 int error = 0, ret, localcred = 0; 812 int fmode = ap->a_fflag; 813 814 if (NFSCL_FORCEDISM(vp->v_mount)) 815 return (0); 816 /* 817 * During shutdown, a_cred isn't valid, so just use root. 818 */ 819 if (ap->a_cred == NOCRED) { 820 cred = newnfs_getcred(); 821 localcred = 1; 822 } else { 823 cred = ap->a_cred; 824 } 825 if (vp->v_type == VREG) { 826 /* 827 * Examine and clean dirty pages, regardless of NMODIFIED. 828 * This closes a major hole in close-to-open consistency. 829 * We want to push out all dirty pages (and buffers) on 830 * close, regardless of whether they were dirtied by 831 * mmap'ed writes or via write(). 832 */ 833 if (nfs_clean_pages_on_close && vp->v_object) { 834 VM_OBJECT_WLOCK(vp->v_object); 835 vm_object_page_clean(vp->v_object, 0, 0, 0); 836 VM_OBJECT_WUNLOCK(vp->v_object); 837 } 838 NFSLOCKNODE(np); 839 if (np->n_flag & NMODIFIED) { 840 NFSUNLOCKNODE(np); 841 if (NFS_ISV3(vp)) { 842 /* 843 * Under NFSv3 we have dirty buffers to dispose of. We 844 * must flush them to the NFS server. We have the option 845 * of waiting all the way through the commit rpc or just 846 * waiting for the initial write. The default is to only 847 * wait through the initial write so the data is in the 848 * server's cache, which is roughly similar to the state 849 * a standard disk subsystem leaves the file in on close(). 850 * 851 * We cannot clear the NMODIFIED bit in np->n_flag due to 852 * potential races with other processes, and certainly 853 * cannot clear it if we don't commit. 854 * These races occur when there is no longer the old 855 * traditional vnode locking implemented for Vnode Ops. 856 */ 857 int cm = newnfs_commit_on_close ? 1 : 0; 858 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0); 859 /* np->n_flag &= ~NMODIFIED; */ 860 } else if (NFS_ISV4(vp)) { 861 if (nfscl_mustflush(vp) != 0) { 862 int cm = newnfs_commit_on_close ? 1 : 0; 863 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 864 cm, 0); 865 /* 866 * as above w.r.t races when clearing 867 * NMODIFIED. 868 * np->n_flag &= ~NMODIFIED; 869 */ 870 } 871 } else { 872 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 873 } 874 NFSLOCKNODE(np); 875 } 876 /* 877 * Invalidate the attribute cache in all cases. 878 * An open is going to fetch fresh attrs any way, other procs 879 * on this node that have file open will be forced to do an 880 * otw attr fetch, but this is safe. 881 * --> A user found that their RPC count dropped by 20% when 882 * this was commented out and I can't see any requirement 883 * for it, so I've disabled it when negative lookups are 884 * enabled. (What does this have to do with negative lookup 885 * caching? Well nothing, except it was reported by the 886 * same user that needed negative lookup caching and I wanted 887 * there to be a way to disable it to see if it 888 * is the cause of some caching/coherency issue that might 889 * crop up.) 890 */ 891 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) { 892 np->n_attrstamp = 0; 893 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 894 } 895 if (np->n_flag & NWRITEERR) { 896 np->n_flag &= ~NWRITEERR; 897 error = np->n_error; 898 } 899 NFSUNLOCKNODE(np); 900 } 901 902 if (NFS_ISV4(vp)) { 903 /* 904 * Get attributes so "change" is up to date. 905 */ 906 if (error == 0 && nfscl_mustflush(vp) != 0 && 907 vp->v_type == VREG && 908 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) { 909 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva, 910 NULL); 911 if (!ret) { 912 np->n_change = nfsva.na_filerev; 913 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 914 NULL, 0, 0); 915 } 916 } 917 918 /* 919 * and do the close. 920 */ 921 ret = nfsrpc_close(vp, 0, ap->a_td); 922 if (!error && ret) 923 error = ret; 924 if (error) 925 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 926 (gid_t)0); 927 } 928 if (newnfs_directio_enable) 929 KASSERT((np->n_directio_asyncwr == 0), 930 ("nfs_close: dirty unflushed (%d) directio buffers\n", 931 np->n_directio_asyncwr)); 932 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 933 NFSLOCKNODE(np); 934 KASSERT((np->n_directio_opens > 0), 935 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 936 np->n_directio_opens--; 937 if (np->n_directio_opens == 0) 938 np->n_flag &= ~NNONCACHE; 939 NFSUNLOCKNODE(np); 940 } 941 if (localcred) 942 NFSFREECRED(cred); 943 return (error); 944 } 945 946 /* 947 * nfs getattr call from vfs. 948 */ 949 static int 950 nfs_getattr(struct vop_getattr_args *ap) 951 { 952 struct vnode *vp = ap->a_vp; 953 struct thread *td = curthread; /* XXX */ 954 struct nfsnode *np = VTONFS(vp); 955 int error = 0; 956 struct nfsvattr nfsva; 957 struct vattr *vap = ap->a_vap; 958 struct vattr vattr; 959 960 /* 961 * Update local times for special files. 962 */ 963 NFSLOCKNODE(np); 964 if (np->n_flag & (NACC | NUPD)) 965 np->n_flag |= NCHG; 966 NFSUNLOCKNODE(np); 967 /* 968 * First look in the cache. 969 */ 970 if (ncl_getattrcache(vp, &vattr) == 0) { 971 ncl_copy_vattr(vap, &vattr); 972 973 /* 974 * Get the local modify time for the case of a write 975 * delegation. 976 */ 977 nfscl_deleggetmodtime(vp, &vap->va_mtime); 978 return (0); 979 } 980 981 if (NFS_ISV34(vp) && nfs_prime_access_cache && 982 nfsaccess_cache_timeout > 0) { 983 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 984 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL); 985 if (ncl_getattrcache(vp, ap->a_vap) == 0) { 986 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime); 987 return (0); 988 } 989 } 990 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL); 991 if (!error) 992 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0); 993 if (!error) { 994 /* 995 * Get the local modify time for the case of a write 996 * delegation. 997 */ 998 nfscl_deleggetmodtime(vp, &vap->va_mtime); 999 } else if (NFS_ISV4(vp)) { 1000 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1001 } 1002 return (error); 1003 } 1004 1005 /* 1006 * nfs setattr call. 1007 */ 1008 static int 1009 nfs_setattr(struct vop_setattr_args *ap) 1010 { 1011 struct vnode *vp = ap->a_vp; 1012 struct nfsnode *np = VTONFS(vp); 1013 struct thread *td = curthread; /* XXX */ 1014 struct vattr *vap = ap->a_vap; 1015 int error = 0; 1016 u_quad_t tsize; 1017 struct timespec ts; 1018 1019 #ifndef nolint 1020 tsize = (u_quad_t)0; 1021 #endif 1022 1023 /* 1024 * Setting of flags and marking of atimes are not supported. 1025 */ 1026 if (vap->va_flags != VNOVAL) 1027 return (EOPNOTSUPP); 1028 1029 /* 1030 * Disallow write attempts if the filesystem is mounted read-only. 1031 */ 1032 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 1033 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 1034 vap->va_mtime.tv_sec != VNOVAL || 1035 vap->va_birthtime.tv_sec != VNOVAL || 1036 vap->va_mode != (mode_t)VNOVAL) && 1037 (vp->v_mount->mnt_flag & MNT_RDONLY)) 1038 return (EROFS); 1039 if (vap->va_size != VNOVAL) { 1040 switch (vp->v_type) { 1041 case VDIR: 1042 return (EISDIR); 1043 case VCHR: 1044 case VBLK: 1045 case VSOCK: 1046 case VFIFO: 1047 if (vap->va_mtime.tv_sec == VNOVAL && 1048 vap->va_atime.tv_sec == VNOVAL && 1049 vap->va_birthtime.tv_sec == VNOVAL && 1050 vap->va_mode == (mode_t)VNOVAL && 1051 vap->va_uid == (uid_t)VNOVAL && 1052 vap->va_gid == (gid_t)VNOVAL) 1053 return (0); 1054 vap->va_size = VNOVAL; 1055 break; 1056 default: 1057 /* 1058 * Disallow write attempts if the filesystem is 1059 * mounted read-only. 1060 */ 1061 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1062 return (EROFS); 1063 /* 1064 * We run vnode_pager_setsize() early (why?), 1065 * we must set np->n_size now to avoid vinvalbuf 1066 * V_SAVE races that might setsize a lower 1067 * value. 1068 */ 1069 NFSLOCKNODE(np); 1070 tsize = np->n_size; 1071 NFSUNLOCKNODE(np); 1072 error = ncl_meta_setsize(vp, td, vap->va_size); 1073 NFSLOCKNODE(np); 1074 if (np->n_flag & NMODIFIED) { 1075 tsize = np->n_size; 1076 NFSUNLOCKNODE(np); 1077 error = ncl_vinvalbuf(vp, vap->va_size == 0 ? 1078 0 : V_SAVE, td, 1); 1079 if (error != 0) { 1080 vnode_pager_setsize(vp, tsize); 1081 return (error); 1082 } 1083 /* 1084 * Call nfscl_delegmodtime() to set the modify time 1085 * locally, as required. 1086 */ 1087 nfscl_delegmodtime(vp); 1088 } else 1089 NFSUNLOCKNODE(np); 1090 /* 1091 * np->n_size has already been set to vap->va_size 1092 * in ncl_meta_setsize(). We must set it again since 1093 * nfs_loadattrcache() could be called through 1094 * ncl_meta_setsize() and could modify np->n_size. 1095 */ 1096 NFSLOCKNODE(np); 1097 np->n_vattr.na_size = np->n_size = vap->va_size; 1098 NFSUNLOCKNODE(np); 1099 } 1100 } else { 1101 NFSLOCKNODE(np); 1102 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 1103 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 1104 NFSUNLOCKNODE(np); 1105 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 1106 if (error == EINTR || error == EIO) 1107 return (error); 1108 } else 1109 NFSUNLOCKNODE(np); 1110 } 1111 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 1112 if (vap->va_size != VNOVAL) { 1113 if (error == 0) { 1114 nanouptime(&ts); 1115 NFSLOCKNODE(np); 1116 np->n_localmodtime = ts; 1117 NFSUNLOCKNODE(np); 1118 } else { 1119 NFSLOCKNODE(np); 1120 np->n_size = np->n_vattr.na_size = tsize; 1121 vnode_pager_setsize(vp, tsize); 1122 NFSUNLOCKNODE(np); 1123 } 1124 } 1125 return (error); 1126 } 1127 1128 /* 1129 * Do an nfs setattr rpc. 1130 */ 1131 static int 1132 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 1133 struct thread *td) 1134 { 1135 struct nfsnode *np = VTONFS(vp); 1136 int error, ret, attrflag, i; 1137 struct nfsvattr nfsva; 1138 1139 if (NFS_ISV34(vp)) { 1140 NFSLOCKNODE(np); 1141 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) 1142 np->n_accesscache[i].stamp = 0; 1143 np->n_flag |= NDELEGMOD; 1144 NFSUNLOCKNODE(np); 1145 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); 1146 } 1147 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag, 1148 NULL); 1149 if (attrflag) { 1150 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1151 if (ret && !error) 1152 error = ret; 1153 } 1154 if (error && NFS_ISV4(vp)) 1155 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid); 1156 return (error); 1157 } 1158 1159 /* 1160 * nfs lookup call, one step at a time... 1161 * First look in cache 1162 * If not found, unlock the directory nfsnode and do the rpc 1163 */ 1164 static int 1165 nfs_lookup(struct vop_lookup_args *ap) 1166 { 1167 struct componentname *cnp = ap->a_cnp; 1168 struct vnode *dvp = ap->a_dvp; 1169 struct vnode **vpp = ap->a_vpp; 1170 struct mount *mp = dvp->v_mount; 1171 int flags = cnp->cn_flags; 1172 struct vnode *newvp; 1173 struct nfsmount *nmp; 1174 struct nfsnode *np, *newnp; 1175 int error = 0, attrflag, dattrflag, ltype, ncticks; 1176 struct thread *td = curthread; 1177 struct nfsfh *nfhp; 1178 struct nfsvattr dnfsva, nfsva; 1179 struct vattr vattr; 1180 struct timespec nctime, ts; 1181 uint32_t openmode; 1182 1183 *vpp = NULLVP; 1184 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) && 1185 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 1186 return (EROFS); 1187 if (dvp->v_type != VDIR) 1188 return (ENOTDIR); 1189 nmp = VFSTONFS(mp); 1190 np = VTONFS(dvp); 1191 1192 /* For NFSv4, wait until any remove is done. */ 1193 NFSLOCKNODE(np); 1194 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) { 1195 np->n_flag |= NREMOVEWANT; 1196 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0); 1197 } 1198 NFSUNLOCKNODE(np); 1199 1200 error = vn_dir_check_exec(dvp, cnp); 1201 if (error != 0) 1202 return (error); 1203 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks); 1204 if (error > 0 && error != ENOENT) 1205 return (error); 1206 if (error == -1) { 1207 /* 1208 * Lookups of "." are special and always return the 1209 * current directory. cache_lookup() already handles 1210 * associated locking bookkeeping, etc. 1211 */ 1212 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 1213 /* XXX: Is this really correct? */ 1214 if (cnp->cn_nameiop != LOOKUP && 1215 (flags & ISLASTCN)) 1216 cnp->cn_flags |= SAVENAME; 1217 return (0); 1218 } 1219 1220 /* 1221 * We only accept a positive hit in the cache if the 1222 * change time of the file matches our cached copy. 1223 * Otherwise, we discard the cache entry and fallback 1224 * to doing a lookup RPC. We also only trust cache 1225 * entries for less than nm_nametimeo seconds. 1226 * 1227 * To better handle stale file handles and attributes, 1228 * clear the attribute cache of this node if it is a 1229 * leaf component, part of an open() call, and not 1230 * locally modified before fetching the attributes. 1231 * This should allow stale file handles to be detected 1232 * here where we can fall back to a LOOKUP RPC to 1233 * recover rather than having nfs_open() detect the 1234 * stale file handle and failing open(2) with ESTALE. 1235 */ 1236 newvp = *vpp; 1237 newnp = VTONFS(newvp); 1238 if (!(nmp->nm_flag & NFSMNT_NOCTO) && 1239 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1240 !(newnp->n_flag & NMODIFIED)) { 1241 NFSLOCKNODE(newnp); 1242 newnp->n_attrstamp = 0; 1243 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1244 NFSUNLOCKNODE(newnp); 1245 } 1246 if (nfscl_nodeleg(newvp, 0) == 0 || 1247 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) && 1248 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 && 1249 timespeccmp(&vattr.va_ctime, &nctime, ==))) { 1250 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1251 if (cnp->cn_nameiop != LOOKUP && 1252 (flags & ISLASTCN)) 1253 cnp->cn_flags |= SAVENAME; 1254 return (0); 1255 } 1256 cache_purge(newvp); 1257 if (dvp != newvp) 1258 vput(newvp); 1259 else 1260 vrele(newvp); 1261 *vpp = NULLVP; 1262 } else if (error == ENOENT) { 1263 if (VN_IS_DOOMED(dvp)) 1264 return (ENOENT); 1265 /* 1266 * We only accept a negative hit in the cache if the 1267 * modification time of the parent directory matches 1268 * the cached copy in the name cache entry. 1269 * Otherwise, we discard all of the negative cache 1270 * entries for this directory. We also only trust 1271 * negative cache entries for up to nm_negnametimeo 1272 * seconds. 1273 */ 1274 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) && 1275 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && 1276 timespeccmp(&vattr.va_mtime, &nctime, ==)) { 1277 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1278 return (ENOENT); 1279 } 1280 cache_purge_negative(dvp); 1281 } 1282 1283 /* 1284 * If this an NFSv4.1/4.2 mount using the "oneopenown" mount 1285 * option, it is possible to do the Open operation in the same 1286 * compound as Lookup, so long as delegations are not being 1287 * issued. This saves doing a separate RPC for Open. 1288 */ 1289 openmode = 0; 1290 NFSLOCKMNT(nmp); 1291 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp) && 1292 (nmp->nm_privflag & NFSMNTP_DELEGISSUED) == 0 && 1293 (!NFSMNT_RDONLY(mp) || (flags & OPENWRITE) == 0) && 1294 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN)) { 1295 if ((flags & OPENREAD) != 0) 1296 openmode |= NFSV4OPEN_ACCESSREAD; 1297 if ((flags & OPENWRITE) != 0) 1298 openmode |= NFSV4OPEN_ACCESSWRITE; 1299 } 1300 NFSUNLOCKMNT(nmp); 1301 1302 newvp = NULLVP; 1303 NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses); 1304 nanouptime(&ts); 1305 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1306 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1307 NULL, openmode); 1308 if (dattrflag) 1309 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1310 if (error) { 1311 if (newvp != NULLVP) { 1312 vput(newvp); 1313 *vpp = NULLVP; 1314 } 1315 1316 if (error != ENOENT) { 1317 if (NFS_ISV4(dvp)) 1318 error = nfscl_maperr(td, error, (uid_t)0, 1319 (gid_t)0); 1320 return (error); 1321 } 1322 1323 /* The requested file was not found. */ 1324 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1325 (flags & ISLASTCN)) { 1326 /* 1327 * XXX: UFS does a full VOP_ACCESS(dvp, 1328 * VWRITE) here instead of just checking 1329 * MNT_RDONLY. 1330 */ 1331 if (mp->mnt_flag & MNT_RDONLY) 1332 return (EROFS); 1333 cnp->cn_flags |= SAVENAME; 1334 return (EJUSTRETURN); 1335 } 1336 1337 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) { 1338 /* 1339 * Cache the modification time of the parent 1340 * directory from the post-op attributes in 1341 * the name cache entry. The negative cache 1342 * entry will be ignored once the directory 1343 * has changed. Don't bother adding the entry 1344 * if the directory has already changed. 1345 */ 1346 NFSLOCKNODE(np); 1347 if (timespeccmp(&np->n_vattr.na_mtime, 1348 &dnfsva.na_mtime, ==)) { 1349 NFSUNLOCKNODE(np); 1350 cache_enter_time(dvp, NULL, cnp, 1351 &dnfsva.na_mtime, NULL); 1352 } else 1353 NFSUNLOCKNODE(np); 1354 } 1355 return (ENOENT); 1356 } 1357 1358 /* 1359 * Handle RENAME case... 1360 */ 1361 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 1362 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1363 free(nfhp, M_NFSFH); 1364 return (EISDIR); 1365 } 1366 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1367 LK_EXCLUSIVE); 1368 if (error) 1369 return (error); 1370 newvp = NFSTOV(np); 1371 /* 1372 * If n_localmodtime >= time before RPC, then 1373 * a file modification operation, such as 1374 * VOP_SETATTR() of size, has occurred while 1375 * the Lookup RPC and acquisition of the vnode 1376 * happened. As such, the attributes might 1377 * be stale, with possibly an incorrect size. 1378 */ 1379 NFSLOCKNODE(np); 1380 if (timespecisset(&np->n_localmodtime) && 1381 timespeccmp(&np->n_localmodtime, &ts, >=)) { 1382 NFSCL_DEBUG(4, "nfs_lookup: rename localmod " 1383 "stale attributes\n"); 1384 attrflag = 0; 1385 } 1386 NFSUNLOCKNODE(np); 1387 if (attrflag) 1388 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1389 0, 1); 1390 *vpp = newvp; 1391 cnp->cn_flags |= SAVENAME; 1392 return (0); 1393 } 1394 1395 if (flags & ISDOTDOT) { 1396 ltype = NFSVOPISLOCKED(dvp); 1397 error = vfs_busy(mp, MBF_NOWAIT); 1398 if (error != 0) { 1399 vfs_ref(mp); 1400 NFSVOPUNLOCK(dvp); 1401 error = vfs_busy(mp, 0); 1402 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1403 vfs_rel(mp); 1404 if (error == 0 && VN_IS_DOOMED(dvp)) { 1405 vfs_unbusy(mp); 1406 error = ENOENT; 1407 } 1408 if (error != 0) 1409 return (error); 1410 } 1411 NFSVOPUNLOCK(dvp); 1412 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1413 cnp->cn_lkflags); 1414 if (error == 0) 1415 newvp = NFSTOV(np); 1416 vfs_unbusy(mp); 1417 if (newvp != dvp) 1418 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1419 if (VN_IS_DOOMED(dvp)) { 1420 if (error == 0) { 1421 if (newvp == dvp) 1422 vrele(newvp); 1423 else 1424 vput(newvp); 1425 } 1426 error = ENOENT; 1427 } 1428 if (error != 0) 1429 return (error); 1430 if (attrflag) 1431 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1432 0, 1); 1433 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1434 free(nfhp, M_NFSFH); 1435 VREF(dvp); 1436 newvp = dvp; 1437 if (attrflag) 1438 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1439 0, 1); 1440 } else { 1441 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1442 cnp->cn_lkflags); 1443 if (error) 1444 return (error); 1445 newvp = NFSTOV(np); 1446 /* 1447 * If n_localmodtime >= time before RPC, then 1448 * a file modification operation, such as 1449 * VOP_SETATTR() of size, has occurred while 1450 * the Lookup RPC and acquisition of the vnode 1451 * happened. As such, the attributes might 1452 * be stale, with possibly an incorrect size. 1453 */ 1454 NFSLOCKNODE(np); 1455 if (timespecisset(&np->n_localmodtime) && 1456 timespeccmp(&np->n_localmodtime, &ts, >=)) { 1457 NFSCL_DEBUG(4, "nfs_lookup: localmod " 1458 "stale attributes\n"); 1459 attrflag = 0; 1460 } 1461 NFSUNLOCKNODE(np); 1462 if (attrflag) 1463 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1464 0, 1); 1465 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1466 !(np->n_flag & NMODIFIED)) { 1467 /* 1468 * Flush the attribute cache when opening a 1469 * leaf node to ensure that fresh attributes 1470 * are fetched in nfs_open() since we did not 1471 * fetch attributes from the LOOKUP reply. 1472 */ 1473 NFSLOCKNODE(np); 1474 np->n_attrstamp = 0; 1475 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1476 NFSUNLOCKNODE(np); 1477 } 1478 } 1479 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1480 cnp->cn_flags |= SAVENAME; 1481 if ((cnp->cn_flags & MAKEENTRY) && dvp != newvp && 1482 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) && 1483 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0)) 1484 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 1485 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime); 1486 *vpp = newvp; 1487 return (0); 1488 } 1489 1490 /* 1491 * nfs read call. 1492 * Just call ncl_bioread() to do the work. 1493 */ 1494 static int 1495 nfs_read(struct vop_read_args *ap) 1496 { 1497 struct vnode *vp = ap->a_vp; 1498 1499 switch (vp->v_type) { 1500 case VREG: 1501 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1502 case VDIR: 1503 return (EISDIR); 1504 default: 1505 return (EOPNOTSUPP); 1506 } 1507 } 1508 1509 /* 1510 * nfs readlink call 1511 */ 1512 static int 1513 nfs_readlink(struct vop_readlink_args *ap) 1514 { 1515 struct vnode *vp = ap->a_vp; 1516 1517 if (vp->v_type != VLNK) 1518 return (EINVAL); 1519 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1520 } 1521 1522 /* 1523 * Do a readlink rpc. 1524 * Called by ncl_doio() from below the buffer cache. 1525 */ 1526 int 1527 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1528 { 1529 int error, ret, attrflag; 1530 struct nfsvattr nfsva; 1531 1532 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva, 1533 &attrflag, NULL); 1534 if (attrflag) { 1535 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1536 if (ret && !error) 1537 error = ret; 1538 } 1539 if (error && NFS_ISV4(vp)) 1540 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1541 return (error); 1542 } 1543 1544 /* 1545 * nfs read rpc call 1546 * Ditto above 1547 */ 1548 int 1549 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1550 { 1551 int error, ret, attrflag; 1552 struct nfsvattr nfsva; 1553 struct nfsmount *nmp; 1554 1555 nmp = VFSTONFS(vp->v_mount); 1556 error = EIO; 1557 attrflag = 0; 1558 if (NFSHASPNFS(nmp)) 1559 error = nfscl_doiods(vp, uiop, NULL, NULL, 1560 NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td); 1561 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error); 1562 if (error != 0) 1563 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, 1564 &attrflag, NULL); 1565 if (attrflag) { 1566 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1567 if (ret && !error) 1568 error = ret; 1569 } 1570 if (error && NFS_ISV4(vp)) 1571 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1572 return (error); 1573 } 1574 1575 /* 1576 * nfs write call 1577 */ 1578 int 1579 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1580 int *iomode, int *must_commit, int called_from_strategy) 1581 { 1582 struct nfsvattr nfsva; 1583 int error, attrflag, ret; 1584 struct nfsmount *nmp; 1585 1586 nmp = VFSTONFS(vp->v_mount); 1587 error = EIO; 1588 attrflag = 0; 1589 if (NFSHASPNFS(nmp)) 1590 error = nfscl_doiods(vp, uiop, iomode, must_commit, 1591 NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td); 1592 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error); 1593 if (error != 0) 1594 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred, 1595 uiop->uio_td, &nfsva, &attrflag, NULL, 1596 called_from_strategy); 1597 if (attrflag) { 1598 if (VTONFS(vp)->n_flag & ND_NFSV4) 1599 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1, 1600 1); 1601 else 1602 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1603 1); 1604 if (ret && !error) 1605 error = ret; 1606 } 1607 if (DOINGASYNC(vp)) 1608 *iomode = NFSWRITE_FILESYNC; 1609 if (error && NFS_ISV4(vp)) 1610 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1611 return (error); 1612 } 1613 1614 /* 1615 * nfs mknod rpc 1616 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1617 * mode set to specify the file type and the size field for rdev. 1618 */ 1619 static int 1620 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1621 struct vattr *vap) 1622 { 1623 struct nfsvattr nfsva, dnfsva; 1624 struct vnode *newvp = NULL; 1625 struct nfsnode *np = NULL, *dnp; 1626 struct nfsfh *nfhp; 1627 struct vattr vattr; 1628 int error = 0, attrflag, dattrflag; 1629 u_int32_t rdev; 1630 1631 if (vap->va_type == VCHR || vap->va_type == VBLK) 1632 rdev = vap->va_rdev; 1633 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1634 rdev = 0xffffffff; 1635 else 1636 return (EOPNOTSUPP); 1637 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1638 return (error); 1639 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap, 1640 rdev, vap->va_type, cnp->cn_cred, curthread, &dnfsva, 1641 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 1642 if (!error) { 1643 if (!nfhp) 1644 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1645 cnp->cn_namelen, cnp->cn_cred, curthread, 1646 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1647 NULL, 0); 1648 if (nfhp) 1649 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1650 curthread, &np, NULL, LK_EXCLUSIVE); 1651 } 1652 if (dattrflag) 1653 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1654 if (!error) { 1655 newvp = NFSTOV(np); 1656 if (attrflag != 0) { 1657 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1658 0, 1); 1659 if (error != 0) 1660 vput(newvp); 1661 } 1662 } 1663 if (!error) { 1664 *vpp = newvp; 1665 } else if (NFS_ISV4(dvp)) { 1666 error = nfscl_maperr(curthread, error, vap->va_uid, 1667 vap->va_gid); 1668 } 1669 dnp = VTONFS(dvp); 1670 NFSLOCKNODE(dnp); 1671 dnp->n_flag |= NMODIFIED; 1672 if (!dattrflag) { 1673 dnp->n_attrstamp = 0; 1674 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1675 } 1676 NFSUNLOCKNODE(dnp); 1677 return (error); 1678 } 1679 1680 /* 1681 * nfs mknod vop 1682 * just call nfs_mknodrpc() to do the work. 1683 */ 1684 /* ARGSUSED */ 1685 static int 1686 nfs_mknod(struct vop_mknod_args *ap) 1687 { 1688 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1689 } 1690 1691 static struct mtx nfs_cverf_mtx; 1692 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex", 1693 MTX_DEF); 1694 1695 static nfsquad_t 1696 nfs_get_cverf(void) 1697 { 1698 static nfsquad_t cverf; 1699 nfsquad_t ret; 1700 static int cverf_initialized = 0; 1701 1702 mtx_lock(&nfs_cverf_mtx); 1703 if (cverf_initialized == 0) { 1704 cverf.lval[0] = arc4random(); 1705 cverf.lval[1] = arc4random(); 1706 cverf_initialized = 1; 1707 } else 1708 cverf.qval++; 1709 ret = cverf; 1710 mtx_unlock(&nfs_cverf_mtx); 1711 1712 return (ret); 1713 } 1714 1715 /* 1716 * nfs file create call 1717 */ 1718 static int 1719 nfs_create(struct vop_create_args *ap) 1720 { 1721 struct vnode *dvp = ap->a_dvp; 1722 struct vattr *vap = ap->a_vap; 1723 struct componentname *cnp = ap->a_cnp; 1724 struct nfsnode *np = NULL, *dnp; 1725 struct vnode *newvp = NULL; 1726 struct nfsmount *nmp; 1727 struct nfsvattr dnfsva, nfsva; 1728 struct nfsfh *nfhp; 1729 nfsquad_t cverf; 1730 int error = 0, attrflag, dattrflag, fmode = 0; 1731 struct vattr vattr; 1732 1733 /* 1734 * Oops, not for me.. 1735 */ 1736 if (vap->va_type == VSOCK) 1737 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1738 1739 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1740 return (error); 1741 if (vap->va_vaflags & VA_EXCLUSIVE) 1742 fmode |= O_EXCL; 1743 dnp = VTONFS(dvp); 1744 nmp = VFSTONFS(dvp->v_mount); 1745 again: 1746 /* For NFSv4, wait until any remove is done. */ 1747 NFSLOCKNODE(dnp); 1748 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) { 1749 dnp->n_flag |= NREMOVEWANT; 1750 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0); 1751 } 1752 NFSUNLOCKNODE(dnp); 1753 1754 cverf = nfs_get_cverf(); 1755 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1756 vap, cverf, fmode, cnp->cn_cred, curthread, &dnfsva, &nfsva, 1757 &nfhp, &attrflag, &dattrflag, NULL); 1758 if (!error) { 1759 if (nfhp == NULL) 1760 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1761 cnp->cn_namelen, cnp->cn_cred, curthread, 1762 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1763 NULL, 0); 1764 if (nfhp != NULL) 1765 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1766 curthread, &np, NULL, LK_EXCLUSIVE); 1767 } 1768 if (dattrflag) 1769 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1770 if (!error) { 1771 newvp = NFSTOV(np); 1772 if (attrflag == 0) 1773 error = nfsrpc_getattr(newvp, cnp->cn_cred, 1774 curthread, &nfsva, NULL); 1775 if (error == 0) 1776 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1777 0, 1); 1778 } 1779 if (error) { 1780 if (newvp != NULL) { 1781 vput(newvp); 1782 newvp = NULL; 1783 } 1784 if (NFS_ISV34(dvp) && (fmode & O_EXCL) && 1785 error == NFSERR_NOTSUPP) { 1786 fmode &= ~O_EXCL; 1787 goto again; 1788 } 1789 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) { 1790 if (nfscl_checksattr(vap, &nfsva)) { 1791 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred, 1792 curthread, &nfsva, &attrflag, NULL); 1793 if (error && (vap->va_uid != (uid_t)VNOVAL || 1794 vap->va_gid != (gid_t)VNOVAL)) { 1795 /* try again without setting uid/gid */ 1796 vap->va_uid = (uid_t)VNOVAL; 1797 vap->va_gid = (uid_t)VNOVAL; 1798 error = nfsrpc_setattr(newvp, vap, NULL, 1799 cnp->cn_cred, curthread, &nfsva, 1800 &attrflag, NULL); 1801 } 1802 if (attrflag) 1803 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 1804 NULL, 0, 1); 1805 if (error != 0) 1806 vput(newvp); 1807 } 1808 } 1809 if (!error) { 1810 if ((cnp->cn_flags & MAKEENTRY) && attrflag) { 1811 if (dvp != newvp) 1812 cache_enter_time(dvp, newvp, cnp, 1813 &nfsva.na_ctime, NULL); 1814 else 1815 printf("nfs_create: bogus NFS server returned " 1816 "the directory as the new file object\n"); 1817 } 1818 *ap->a_vpp = newvp; 1819 } else if (NFS_ISV4(dvp)) { 1820 error = nfscl_maperr(curthread, error, vap->va_uid, 1821 vap->va_gid); 1822 } 1823 NFSLOCKNODE(dnp); 1824 dnp->n_flag |= NMODIFIED; 1825 if (!dattrflag) { 1826 dnp->n_attrstamp = 0; 1827 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1828 } 1829 NFSUNLOCKNODE(dnp); 1830 return (error); 1831 } 1832 1833 /* 1834 * nfs file remove call 1835 * To try and make nfs semantics closer to ufs semantics, a file that has 1836 * other processes using the vnode is renamed instead of removed and then 1837 * removed later on the last close. 1838 * - If v_usecount > 1 1839 * If a rename is not already in the works 1840 * call nfs_sillyrename() to set it up 1841 * else 1842 * do the remove rpc 1843 */ 1844 static int 1845 nfs_remove(struct vop_remove_args *ap) 1846 { 1847 struct vnode *vp = ap->a_vp; 1848 struct vnode *dvp = ap->a_dvp; 1849 struct componentname *cnp = ap->a_cnp; 1850 struct nfsnode *np = VTONFS(vp); 1851 int error = 0; 1852 struct vattr vattr; 1853 1854 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name")); 1855 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount")); 1856 if (vp->v_type == VDIR) 1857 error = EPERM; 1858 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1859 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1860 vattr.va_nlink > 1)) { 1861 /* 1862 * Purge the name cache so that the chance of a lookup for 1863 * the name succeeding while the remove is in progress is 1864 * minimized. Without node locking it can still happen, such 1865 * that an I/O op returns ESTALE, but since you get this if 1866 * another host removes the file.. 1867 */ 1868 cache_purge(vp); 1869 /* 1870 * throw away biocache buffers, mainly to avoid 1871 * unnecessary delayed writes later. 1872 */ 1873 error = ncl_vinvalbuf(vp, 0, curthread, 1); 1874 if (error != EINTR && error != EIO) 1875 /* Do the rpc */ 1876 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr, 1877 cnp->cn_namelen, cnp->cn_cred, curthread); 1878 /* 1879 * Kludge City: If the first reply to the remove rpc is lost.. 1880 * the reply to the retransmitted request will be ENOENT 1881 * since the file was in fact removed 1882 * Therefore, we cheat and return success. 1883 */ 1884 if (error == ENOENT) 1885 error = 0; 1886 } else if (!np->n_sillyrename) 1887 error = nfs_sillyrename(dvp, vp, cnp); 1888 NFSLOCKNODE(np); 1889 np->n_attrstamp = 0; 1890 NFSUNLOCKNODE(np); 1891 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1892 return (error); 1893 } 1894 1895 /* 1896 * nfs file remove rpc called from nfs_inactive 1897 */ 1898 int 1899 ncl_removeit(struct sillyrename *sp, struct vnode *vp) 1900 { 1901 /* 1902 * Make sure that the directory vnode is still valid. 1903 * XXX we should lock sp->s_dvp here. 1904 */ 1905 if (sp->s_dvp->v_type == VBAD) 1906 return (0); 1907 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen, 1908 sp->s_cred, NULL)); 1909 } 1910 1911 /* 1912 * Nfs remove rpc, called from nfs_remove() and ncl_removeit(). 1913 */ 1914 static int 1915 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 1916 int namelen, struct ucred *cred, struct thread *td) 1917 { 1918 struct nfsvattr dnfsva; 1919 struct nfsnode *dnp = VTONFS(dvp); 1920 int error = 0, dattrflag; 1921 1922 NFSLOCKNODE(dnp); 1923 dnp->n_flag |= NREMOVEINPROG; 1924 NFSUNLOCKNODE(dnp); 1925 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva, 1926 &dattrflag, NULL); 1927 NFSLOCKNODE(dnp); 1928 if ((dnp->n_flag & NREMOVEWANT)) { 1929 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG); 1930 NFSUNLOCKNODE(dnp); 1931 wakeup((caddr_t)dnp); 1932 } else { 1933 dnp->n_flag &= ~NREMOVEINPROG; 1934 NFSUNLOCKNODE(dnp); 1935 } 1936 if (dattrflag) 1937 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1938 NFSLOCKNODE(dnp); 1939 dnp->n_flag |= NMODIFIED; 1940 if (!dattrflag) { 1941 dnp->n_attrstamp = 0; 1942 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1943 } 1944 NFSUNLOCKNODE(dnp); 1945 if (error && NFS_ISV4(dvp)) 1946 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1947 return (error); 1948 } 1949 1950 /* 1951 * nfs file rename call 1952 */ 1953 static int 1954 nfs_rename(struct vop_rename_args *ap) 1955 { 1956 struct vnode *fvp = ap->a_fvp; 1957 struct vnode *tvp = ap->a_tvp; 1958 struct vnode *fdvp = ap->a_fdvp; 1959 struct vnode *tdvp = ap->a_tdvp; 1960 struct componentname *tcnp = ap->a_tcnp; 1961 struct componentname *fcnp = ap->a_fcnp; 1962 struct nfsnode *fnp = VTONFS(ap->a_fvp); 1963 struct nfsnode *tdnp = VTONFS(ap->a_tdvp); 1964 struct nfsv4node *newv4 = NULL; 1965 int error; 1966 1967 KASSERT((tcnp->cn_flags & HASBUF) != 0 && 1968 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name")); 1969 /* Check for cross-device rename */ 1970 if ((fvp->v_mount != tdvp->v_mount) || 1971 (tvp && (fvp->v_mount != tvp->v_mount))) { 1972 error = EXDEV; 1973 goto out; 1974 } 1975 1976 if (fvp == tvp) { 1977 printf("nfs_rename: fvp == tvp (can't happen)\n"); 1978 error = 0; 1979 goto out; 1980 } 1981 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0) 1982 goto out; 1983 1984 /* 1985 * We have to flush B_DELWRI data prior to renaming 1986 * the file. If we don't, the delayed-write buffers 1987 * can be flushed out later after the file has gone stale 1988 * under NFSV3. NFSV2 does not have this problem because 1989 * ( as far as I can tell ) it flushes dirty buffers more 1990 * often. 1991 * 1992 * Skip the rename operation if the fsync fails, this can happen 1993 * due to the server's volume being full, when we pushed out data 1994 * that was written back to our cache earlier. Not checking for 1995 * this condition can result in potential (silent) data loss. 1996 */ 1997 error = VOP_FSYNC(fvp, MNT_WAIT, curthread); 1998 NFSVOPUNLOCK(fvp); 1999 if (!error && tvp) 2000 error = VOP_FSYNC(tvp, MNT_WAIT, curthread); 2001 if (error) 2002 goto out; 2003 2004 /* 2005 * If the tvp exists and is in use, sillyrename it before doing the 2006 * rename of the new file over it. 2007 * XXX Can't sillyrename a directory. 2008 */ 2009 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 2010 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 2011 vput(tvp); 2012 tvp = NULL; 2013 } 2014 2015 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen, 2016 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 2017 curthread); 2018 2019 if (error == 0 && NFS_ISV4(tdvp)) { 2020 /* 2021 * For NFSv4, check to see if it is the same name and 2022 * replace the name, if it is different. 2023 */ 2024 newv4 = malloc( 2025 sizeof (struct nfsv4node) + 2026 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1, 2027 M_NFSV4NODE, M_WAITOK); 2028 NFSLOCKNODE(tdnp); 2029 NFSLOCKNODE(fnp); 2030 if (fnp->n_v4 != NULL && fvp->v_type == VREG && 2031 (fnp->n_v4->n4_namelen != tcnp->cn_namelen || 2032 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4), 2033 tcnp->cn_namelen) || 2034 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen || 2035 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 2036 tdnp->n_fhp->nfh_len))) { 2037 #ifdef notdef 2038 { char nnn[100]; int nnnl; 2039 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99; 2040 bcopy(tcnp->cn_nameptr, nnn, nnnl); 2041 nnn[nnnl] = '\0'; 2042 printf("ren replace=%s\n",nnn); 2043 } 2044 #endif 2045 free(fnp->n_v4, M_NFSV4NODE); 2046 fnp->n_v4 = newv4; 2047 newv4 = NULL; 2048 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len; 2049 fnp->n_v4->n4_namelen = tcnp->cn_namelen; 2050 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 2051 tdnp->n_fhp->nfh_len); 2052 NFSBCOPY(tcnp->cn_nameptr, 2053 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen); 2054 } 2055 NFSUNLOCKNODE(tdnp); 2056 NFSUNLOCKNODE(fnp); 2057 if (newv4 != NULL) 2058 free(newv4, M_NFSV4NODE); 2059 } 2060 2061 if (fvp->v_type == VDIR) { 2062 if (tvp != NULL && tvp->v_type == VDIR) 2063 cache_purge(tdvp); 2064 cache_purge(fdvp); 2065 } 2066 2067 out: 2068 if (tdvp == tvp) 2069 vrele(tdvp); 2070 else 2071 vput(tdvp); 2072 if (tvp) 2073 vput(tvp); 2074 vrele(fdvp); 2075 vrele(fvp); 2076 /* 2077 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 2078 */ 2079 if (error == ENOENT) 2080 error = 0; 2081 return (error); 2082 } 2083 2084 /* 2085 * nfs file rename rpc called from nfs_remove() above 2086 */ 2087 static int 2088 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp, 2089 struct sillyrename *sp) 2090 { 2091 2092 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen, 2093 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred, 2094 curthread)); 2095 } 2096 2097 /* 2098 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 2099 */ 2100 static int 2101 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr, 2102 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr, 2103 int tnamelen, struct ucred *cred, struct thread *td) 2104 { 2105 struct nfsvattr fnfsva, tnfsva; 2106 struct nfsnode *fdnp = VTONFS(fdvp); 2107 struct nfsnode *tdnp = VTONFS(tdvp); 2108 int error = 0, fattrflag, tattrflag; 2109 2110 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp, 2111 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag, 2112 &tattrflag, NULL, NULL); 2113 NFSLOCKNODE(fdnp); 2114 fdnp->n_flag |= NMODIFIED; 2115 if (fattrflag != 0) { 2116 NFSUNLOCKNODE(fdnp); 2117 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1); 2118 } else { 2119 fdnp->n_attrstamp = 0; 2120 NFSUNLOCKNODE(fdnp); 2121 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 2122 } 2123 NFSLOCKNODE(tdnp); 2124 tdnp->n_flag |= NMODIFIED; 2125 if (tattrflag != 0) { 2126 NFSUNLOCKNODE(tdnp); 2127 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1); 2128 } else { 2129 tdnp->n_attrstamp = 0; 2130 NFSUNLOCKNODE(tdnp); 2131 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2132 } 2133 if (error && NFS_ISV4(fdvp)) 2134 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2135 return (error); 2136 } 2137 2138 /* 2139 * nfs hard link create call 2140 */ 2141 static int 2142 nfs_link(struct vop_link_args *ap) 2143 { 2144 struct vnode *vp = ap->a_vp; 2145 struct vnode *tdvp = ap->a_tdvp; 2146 struct componentname *cnp = ap->a_cnp; 2147 struct nfsnode *np, *tdnp; 2148 struct nfsvattr nfsva, dnfsva; 2149 int error = 0, attrflag, dattrflag; 2150 2151 /* 2152 * Push all writes to the server, so that the attribute cache 2153 * doesn't get "out of sync" with the server. 2154 * XXX There should be a better way! 2155 */ 2156 VOP_FSYNC(vp, MNT_WAIT, curthread); 2157 2158 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 2159 cnp->cn_cred, curthread, &dnfsva, &nfsva, &attrflag, 2160 &dattrflag, NULL); 2161 tdnp = VTONFS(tdvp); 2162 NFSLOCKNODE(tdnp); 2163 tdnp->n_flag |= NMODIFIED; 2164 if (dattrflag != 0) { 2165 NFSUNLOCKNODE(tdnp); 2166 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1); 2167 } else { 2168 tdnp->n_attrstamp = 0; 2169 NFSUNLOCKNODE(tdnp); 2170 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2171 } 2172 if (attrflag) 2173 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2174 else { 2175 np = VTONFS(vp); 2176 NFSLOCKNODE(np); 2177 np->n_attrstamp = 0; 2178 NFSUNLOCKNODE(np); 2179 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 2180 } 2181 /* 2182 * If negative lookup caching is enabled, I might as well 2183 * add an entry for this node. Not necessary for correctness, 2184 * but if negative caching is enabled, then the system 2185 * must care about lookup caching hit rate, so... 2186 */ 2187 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 && 2188 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2189 if (tdvp != vp) 2190 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL); 2191 else 2192 printf("nfs_link: bogus NFS server returned " 2193 "the directory as the new link\n"); 2194 } 2195 if (error && NFS_ISV4(vp)) 2196 error = nfscl_maperr(curthread, error, (uid_t)0, 2197 (gid_t)0); 2198 return (error); 2199 } 2200 2201 /* 2202 * nfs symbolic link create call 2203 */ 2204 static int 2205 nfs_symlink(struct vop_symlink_args *ap) 2206 { 2207 struct vnode *dvp = ap->a_dvp; 2208 struct vattr *vap = ap->a_vap; 2209 struct componentname *cnp = ap->a_cnp; 2210 struct nfsvattr nfsva, dnfsva; 2211 struct nfsfh *nfhp; 2212 struct nfsnode *np = NULL, *dnp; 2213 struct vnode *newvp = NULL; 2214 int error = 0, attrflag, dattrflag, ret; 2215 2216 vap->va_type = VLNK; 2217 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2218 ap->a_target, vap, cnp->cn_cred, curthread, &dnfsva, 2219 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 2220 if (nfhp) { 2221 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread, 2222 &np, NULL, LK_EXCLUSIVE); 2223 if (!ret) 2224 newvp = NFSTOV(np); 2225 else if (!error) 2226 error = ret; 2227 } 2228 if (newvp != NULL) { 2229 if (attrflag) 2230 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2231 0, 1); 2232 } else if (!error) { 2233 /* 2234 * If we do not have an error and we could not extract the 2235 * newvp from the response due to the request being NFSv2, we 2236 * have to do a lookup in order to obtain a newvp to return. 2237 */ 2238 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2239 cnp->cn_cred, curthread, &np); 2240 if (!error) 2241 newvp = NFSTOV(np); 2242 } 2243 if (error) { 2244 if (newvp) 2245 vput(newvp); 2246 if (NFS_ISV4(dvp)) 2247 error = nfscl_maperr(curthread, error, 2248 vap->va_uid, vap->va_gid); 2249 } else { 2250 *ap->a_vpp = newvp; 2251 } 2252 2253 dnp = VTONFS(dvp); 2254 NFSLOCKNODE(dnp); 2255 dnp->n_flag |= NMODIFIED; 2256 if (dattrflag != 0) { 2257 NFSUNLOCKNODE(dnp); 2258 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2259 } else { 2260 dnp->n_attrstamp = 0; 2261 NFSUNLOCKNODE(dnp); 2262 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2263 } 2264 /* 2265 * If negative lookup caching is enabled, I might as well 2266 * add an entry for this node. Not necessary for correctness, 2267 * but if negative caching is enabled, then the system 2268 * must care about lookup caching hit rate, so... 2269 */ 2270 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2271 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2272 if (dvp != newvp) 2273 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 2274 NULL); 2275 else 2276 printf("nfs_symlink: bogus NFS server returned " 2277 "the directory as the new file object\n"); 2278 } 2279 return (error); 2280 } 2281 2282 /* 2283 * nfs make dir call 2284 */ 2285 static int 2286 nfs_mkdir(struct vop_mkdir_args *ap) 2287 { 2288 struct vnode *dvp = ap->a_dvp; 2289 struct vattr *vap = ap->a_vap; 2290 struct componentname *cnp = ap->a_cnp; 2291 struct nfsnode *np = NULL, *dnp; 2292 struct vnode *newvp = NULL; 2293 struct vattr vattr; 2294 struct nfsfh *nfhp; 2295 struct nfsvattr nfsva, dnfsva; 2296 int error = 0, attrflag, dattrflag, ret; 2297 2298 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2299 return (error); 2300 vap->va_type = VDIR; 2301 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2302 vap, cnp->cn_cred, curthread, &dnfsva, &nfsva, &nfhp, 2303 &attrflag, &dattrflag, NULL); 2304 dnp = VTONFS(dvp); 2305 NFSLOCKNODE(dnp); 2306 dnp->n_flag |= NMODIFIED; 2307 if (dattrflag != 0) { 2308 NFSUNLOCKNODE(dnp); 2309 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2310 } else { 2311 dnp->n_attrstamp = 0; 2312 NFSUNLOCKNODE(dnp); 2313 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2314 } 2315 if (nfhp) { 2316 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread, 2317 &np, NULL, LK_EXCLUSIVE); 2318 if (!ret) { 2319 newvp = NFSTOV(np); 2320 if (attrflag) 2321 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 2322 NULL, 0, 1); 2323 } else if (!error) 2324 error = ret; 2325 } 2326 if (!error && newvp == NULL) { 2327 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2328 cnp->cn_cred, curthread, &np); 2329 if (!error) { 2330 newvp = NFSTOV(np); 2331 if (newvp->v_type != VDIR) 2332 error = EEXIST; 2333 } 2334 } 2335 if (error) { 2336 if (newvp) 2337 vput(newvp); 2338 if (NFS_ISV4(dvp)) 2339 error = nfscl_maperr(curthread, error, 2340 vap->va_uid, vap->va_gid); 2341 } else { 2342 /* 2343 * If negative lookup caching is enabled, I might as well 2344 * add an entry for this node. Not necessary for correctness, 2345 * but if negative caching is enabled, then the system 2346 * must care about lookup caching hit rate, so... 2347 */ 2348 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2349 (cnp->cn_flags & MAKEENTRY) && 2350 attrflag != 0 && dattrflag != 0) { 2351 if (dvp != newvp) 2352 cache_enter_time(dvp, newvp, cnp, 2353 &nfsva.na_ctime, &dnfsva.na_ctime); 2354 else 2355 printf("nfs_mkdir: bogus NFS server returned " 2356 "the directory that the directory was " 2357 "created in as the new file object\n"); 2358 } 2359 *ap->a_vpp = newvp; 2360 } 2361 return (error); 2362 } 2363 2364 /* 2365 * nfs remove directory call 2366 */ 2367 static int 2368 nfs_rmdir(struct vop_rmdir_args *ap) 2369 { 2370 struct vnode *vp = ap->a_vp; 2371 struct vnode *dvp = ap->a_dvp; 2372 struct componentname *cnp = ap->a_cnp; 2373 struct nfsnode *dnp; 2374 struct nfsvattr dnfsva; 2375 int error, dattrflag; 2376 2377 if (dvp == vp) 2378 return (EINVAL); 2379 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2380 cnp->cn_cred, curthread, &dnfsva, &dattrflag, NULL); 2381 dnp = VTONFS(dvp); 2382 NFSLOCKNODE(dnp); 2383 dnp->n_flag |= NMODIFIED; 2384 if (dattrflag != 0) { 2385 NFSUNLOCKNODE(dnp); 2386 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2387 } else { 2388 dnp->n_attrstamp = 0; 2389 NFSUNLOCKNODE(dnp); 2390 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2391 } 2392 2393 cache_purge(dvp); 2394 cache_purge(vp); 2395 if (error && NFS_ISV4(dvp)) 2396 error = nfscl_maperr(curthread, error, (uid_t)0, 2397 (gid_t)0); 2398 /* 2399 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2400 */ 2401 if (error == ENOENT) 2402 error = 0; 2403 return (error); 2404 } 2405 2406 /* 2407 * nfs readdir call 2408 */ 2409 static int 2410 nfs_readdir(struct vop_readdir_args *ap) 2411 { 2412 struct vnode *vp = ap->a_vp; 2413 struct nfsnode *np = VTONFS(vp); 2414 struct uio *uio = ap->a_uio; 2415 ssize_t tresid, left; 2416 int error = 0; 2417 struct vattr vattr; 2418 2419 if (ap->a_eofflag != NULL) 2420 *ap->a_eofflag = 0; 2421 if (vp->v_type != VDIR) 2422 return(EPERM); 2423 2424 /* 2425 * First, check for hit on the EOF offset cache 2426 */ 2427 NFSLOCKNODE(np); 2428 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2429 (np->n_flag & NMODIFIED) == 0) { 2430 NFSUNLOCKNODE(np); 2431 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2432 NFSLOCKNODE(np); 2433 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) || 2434 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2435 NFSUNLOCKNODE(np); 2436 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits); 2437 if (ap->a_eofflag != NULL) 2438 *ap->a_eofflag = 1; 2439 return (0); 2440 } else 2441 NFSUNLOCKNODE(np); 2442 } 2443 } else 2444 NFSUNLOCKNODE(np); 2445 2446 /* 2447 * NFS always guarantees that directory entries don't straddle 2448 * DIRBLKSIZ boundaries. As such, we need to limit the size 2449 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial 2450 * directory entry. 2451 */ 2452 left = uio->uio_resid % DIRBLKSIZ; 2453 if (left == uio->uio_resid) 2454 return (EINVAL); 2455 uio->uio_resid -= left; 2456 2457 /* 2458 * Call ncl_bioread() to do the real work. 2459 */ 2460 tresid = uio->uio_resid; 2461 error = ncl_bioread(vp, uio, 0, ap->a_cred); 2462 2463 if (!error && uio->uio_resid == tresid) { 2464 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses); 2465 if (ap->a_eofflag != NULL) 2466 *ap->a_eofflag = 1; 2467 } 2468 2469 /* Add the partial DIRBLKSIZ (left) back in. */ 2470 uio->uio_resid += left; 2471 return (error); 2472 } 2473 2474 /* 2475 * Readdir rpc call. 2476 * Called from below the buffer cache by ncl_doio(). 2477 */ 2478 int 2479 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2480 struct thread *td) 2481 { 2482 struct nfsvattr nfsva; 2483 nfsuint64 *cookiep, cookie; 2484 struct nfsnode *dnp = VTONFS(vp); 2485 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2486 int error = 0, eof, attrflag; 2487 2488 KASSERT(uiop->uio_iovcnt == 1 && 2489 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2490 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2491 ("nfs readdirrpc bad uio")); 2492 2493 /* 2494 * If there is no cookie, assume directory was stale. 2495 */ 2496 ncl_dircookie_lock(dnp); 2497 NFSUNLOCKNODE(dnp); 2498 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2499 if (cookiep) { 2500 cookie = *cookiep; 2501 ncl_dircookie_unlock(dnp); 2502 } else { 2503 ncl_dircookie_unlock(dnp); 2504 return (NFSERR_BAD_COOKIE); 2505 } 2506 2507 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2508 (void)ncl_fsinfo(nmp, vp, cred, td); 2509 2510 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva, 2511 &attrflag, &eof, NULL); 2512 if (attrflag) 2513 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2514 2515 if (!error) { 2516 /* 2517 * We are now either at the end of the directory or have filled 2518 * the block. 2519 */ 2520 if (eof) { 2521 NFSLOCKNODE(dnp); 2522 dnp->n_direofoffset = uiop->uio_offset; 2523 NFSUNLOCKNODE(dnp); 2524 } else { 2525 if (uiop->uio_resid > 0) 2526 printf("EEK! readdirrpc resid > 0\n"); 2527 ncl_dircookie_lock(dnp); 2528 NFSUNLOCKNODE(dnp); 2529 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2530 *cookiep = cookie; 2531 ncl_dircookie_unlock(dnp); 2532 } 2533 } else if (NFS_ISV4(vp)) { 2534 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2535 } 2536 return (error); 2537 } 2538 2539 /* 2540 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc(). 2541 */ 2542 int 2543 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2544 struct thread *td) 2545 { 2546 struct nfsvattr nfsva; 2547 nfsuint64 *cookiep, cookie; 2548 struct nfsnode *dnp = VTONFS(vp); 2549 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2550 int error = 0, attrflag, eof; 2551 2552 KASSERT(uiop->uio_iovcnt == 1 && 2553 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2554 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2555 ("nfs readdirplusrpc bad uio")); 2556 2557 /* 2558 * If there is no cookie, assume directory was stale. 2559 */ 2560 ncl_dircookie_lock(dnp); 2561 NFSUNLOCKNODE(dnp); 2562 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2563 if (cookiep) { 2564 cookie = *cookiep; 2565 ncl_dircookie_unlock(dnp); 2566 } else { 2567 ncl_dircookie_unlock(dnp); 2568 return (NFSERR_BAD_COOKIE); 2569 } 2570 2571 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2572 (void)ncl_fsinfo(nmp, vp, cred, td); 2573 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva, 2574 &attrflag, &eof, NULL); 2575 if (attrflag) 2576 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2577 2578 if (!error) { 2579 /* 2580 * We are now either at end of the directory or have filled the 2581 * the block. 2582 */ 2583 if (eof) { 2584 NFSLOCKNODE(dnp); 2585 dnp->n_direofoffset = uiop->uio_offset; 2586 NFSUNLOCKNODE(dnp); 2587 } else { 2588 if (uiop->uio_resid > 0) 2589 printf("EEK! readdirplusrpc resid > 0\n"); 2590 ncl_dircookie_lock(dnp); 2591 NFSUNLOCKNODE(dnp); 2592 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2593 *cookiep = cookie; 2594 ncl_dircookie_unlock(dnp); 2595 } 2596 } else if (NFS_ISV4(vp)) { 2597 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2598 } 2599 return (error); 2600 } 2601 2602 /* 2603 * Silly rename. To make the NFS filesystem that is stateless look a little 2604 * more like the "ufs" a remove of an active vnode is translated to a rename 2605 * to a funny looking filename that is removed by nfs_inactive on the 2606 * nfsnode. There is the potential for another process on a different client 2607 * to create the same funny name between the nfs_lookitup() fails and the 2608 * nfs_rename() completes, but... 2609 */ 2610 static int 2611 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2612 { 2613 struct sillyrename *sp; 2614 struct nfsnode *np; 2615 int error; 2616 short pid; 2617 unsigned int lticks; 2618 2619 cache_purge(dvp); 2620 np = VTONFS(vp); 2621 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir")); 2622 sp = malloc(sizeof (struct sillyrename), 2623 M_NEWNFSREQ, M_WAITOK); 2624 sp->s_cred = crhold(cnp->cn_cred); 2625 sp->s_dvp = dvp; 2626 VREF(dvp); 2627 2628 /* 2629 * Fudge together a funny name. 2630 * Changing the format of the funny name to accommodate more 2631 * sillynames per directory. 2632 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2633 * CPU ticks since boot. 2634 */ 2635 pid = curthread->td_proc->p_pid; 2636 lticks = (unsigned int)ticks; 2637 for ( ; ; ) { 2638 sp->s_namlen = sprintf(sp->s_name, 2639 ".nfs.%08x.%04x4.4", lticks, 2640 pid); 2641 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2642 curthread, NULL)) 2643 break; 2644 lticks++; 2645 } 2646 error = nfs_renameit(dvp, vp, cnp, sp); 2647 if (error) 2648 goto bad; 2649 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2650 curthread, &np); 2651 np->n_sillyrename = sp; 2652 return (0); 2653 bad: 2654 vrele(sp->s_dvp); 2655 crfree(sp->s_cred); 2656 free(sp, M_NEWNFSREQ); 2657 return (error); 2658 } 2659 2660 /* 2661 * Look up a file name and optionally either update the file handle or 2662 * allocate an nfsnode, depending on the value of npp. 2663 * npp == NULL --> just do the lookup 2664 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2665 * handled too 2666 * *npp != NULL --> update the file handle in the vnode 2667 */ 2668 static int 2669 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred, 2670 struct thread *td, struct nfsnode **npp) 2671 { 2672 struct vnode *newvp = NULL, *vp; 2673 struct nfsnode *np, *dnp = VTONFS(dvp); 2674 struct nfsfh *nfhp, *onfhp; 2675 struct nfsvattr nfsva, dnfsva; 2676 struct componentname cn; 2677 int error = 0, attrflag, dattrflag; 2678 u_int hash; 2679 struct timespec ts; 2680 2681 nanouptime(&ts); 2682 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva, 2683 &nfhp, &attrflag, &dattrflag, NULL, 0); 2684 if (dattrflag) 2685 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2686 if (npp && !error) { 2687 if (*npp != NULL) { 2688 np = *npp; 2689 vp = NFSTOV(np); 2690 /* 2691 * For NFSv4, check to see if it is the same name and 2692 * replace the name, if it is different. 2693 */ 2694 if (np->n_v4 != NULL && nfsva.na_type == VREG && 2695 (np->n_v4->n4_namelen != len || 2696 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) || 2697 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen || 2698 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2699 dnp->n_fhp->nfh_len))) { 2700 #ifdef notdef 2701 { char nnn[100]; int nnnl; 2702 nnnl = (len < 100) ? len : 99; 2703 bcopy(name, nnn, nnnl); 2704 nnn[nnnl] = '\0'; 2705 printf("replace=%s\n",nnn); 2706 } 2707 #endif 2708 free(np->n_v4, M_NFSV4NODE); 2709 np->n_v4 = malloc( 2710 sizeof (struct nfsv4node) + 2711 dnp->n_fhp->nfh_len + len - 1, 2712 M_NFSV4NODE, M_WAITOK); 2713 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len; 2714 np->n_v4->n4_namelen = len; 2715 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2716 dnp->n_fhp->nfh_len); 2717 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len); 2718 } 2719 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, 2720 FNV1_32_INIT); 2721 onfhp = np->n_fhp; 2722 /* 2723 * Rehash node for new file handle. 2724 */ 2725 vfs_hash_rehash(vp, hash); 2726 np->n_fhp = nfhp; 2727 if (onfhp != NULL) 2728 free(onfhp, M_NFSFH); 2729 newvp = NFSTOV(np); 2730 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) { 2731 free(nfhp, M_NFSFH); 2732 VREF(dvp); 2733 newvp = dvp; 2734 } else { 2735 cn.cn_nameptr = name; 2736 cn.cn_namelen = len; 2737 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td, 2738 &np, NULL, LK_EXCLUSIVE); 2739 if (error) 2740 return (error); 2741 newvp = NFSTOV(np); 2742 /* 2743 * If n_localmodtime >= time before RPC, then 2744 * a file modification operation, such as 2745 * VOP_SETATTR() of size, has occurred while 2746 * the Lookup RPC and acquisition of the vnode 2747 * happened. As such, the attributes might 2748 * be stale, with possibly an incorrect size. 2749 */ 2750 NFSLOCKNODE(np); 2751 if (timespecisset(&np->n_localmodtime) && 2752 timespeccmp(&np->n_localmodtime, &ts, >=)) { 2753 NFSCL_DEBUG(4, "nfs_lookitup: localmod " 2754 "stale attributes\n"); 2755 attrflag = 0; 2756 } 2757 NFSUNLOCKNODE(np); 2758 } 2759 if (!attrflag && *npp == NULL) { 2760 if (newvp == dvp) 2761 vrele(newvp); 2762 else 2763 vput(newvp); 2764 return (ENOENT); 2765 } 2766 if (attrflag) 2767 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2768 0, 1); 2769 } 2770 if (npp && *npp == NULL) { 2771 if (error) { 2772 if (newvp) { 2773 if (newvp == dvp) 2774 vrele(newvp); 2775 else 2776 vput(newvp); 2777 } 2778 } else 2779 *npp = np; 2780 } 2781 if (error && NFS_ISV4(dvp)) 2782 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2783 return (error); 2784 } 2785 2786 /* 2787 * Nfs Version 3 and 4 commit rpc 2788 */ 2789 int 2790 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2791 struct thread *td) 2792 { 2793 struct nfsvattr nfsva; 2794 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2795 struct nfsnode *np; 2796 struct uio uio; 2797 int error, attrflag; 2798 2799 np = VTONFS(vp); 2800 error = EIO; 2801 attrflag = 0; 2802 if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) { 2803 uio.uio_offset = offset; 2804 uio.uio_resid = cnt; 2805 error = nfscl_doiods(vp, &uio, NULL, NULL, 2806 NFSV4OPEN_ACCESSWRITE, 1, cred, td); 2807 if (error != 0) { 2808 NFSLOCKNODE(np); 2809 np->n_flag &= ~NDSCOMMIT; 2810 NFSUNLOCKNODE(np); 2811 } 2812 } 2813 if (error != 0) { 2814 mtx_lock(&nmp->nm_mtx); 2815 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2816 mtx_unlock(&nmp->nm_mtx); 2817 return (0); 2818 } 2819 mtx_unlock(&nmp->nm_mtx); 2820 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva, 2821 &attrflag, NULL); 2822 } 2823 if (attrflag != 0) 2824 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 2825 0, 1); 2826 if (error != 0 && NFS_ISV4(vp)) 2827 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2828 return (error); 2829 } 2830 2831 /* 2832 * Strategy routine. 2833 * For async requests when nfsiod(s) are running, queue the request by 2834 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the 2835 * request. 2836 */ 2837 static int 2838 nfs_strategy(struct vop_strategy_args *ap) 2839 { 2840 struct buf *bp; 2841 struct vnode *vp; 2842 struct ucred *cr; 2843 2844 bp = ap->a_bp; 2845 vp = ap->a_vp; 2846 KASSERT(bp->b_vp == vp, ("missing b_getvp")); 2847 KASSERT(!(bp->b_flags & B_DONE), 2848 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2849 2850 if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno) 2851 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize / 2852 DEV_BSIZE); 2853 if (bp->b_iocmd == BIO_READ) 2854 cr = bp->b_rcred; 2855 else 2856 cr = bp->b_wcred; 2857 2858 /* 2859 * If the op is asynchronous and an i/o daemon is waiting 2860 * queue the request, wake it up and wait for completion 2861 * otherwise just do it ourselves. 2862 */ 2863 if ((bp->b_flags & B_ASYNC) == 0 || 2864 ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread)) 2865 (void) ncl_doio(vp, bp, cr, curthread, 1); 2866 return (0); 2867 } 2868 2869 /* 2870 * fsync vnode op. Just call ncl_flush() with commit == 1. 2871 */ 2872 /* ARGSUSED */ 2873 static int 2874 nfs_fsync(struct vop_fsync_args *ap) 2875 { 2876 2877 if (ap->a_vp->v_type != VREG) { 2878 /* 2879 * For NFS, metadata is changed synchronously on the server, 2880 * so there is nothing to flush. Also, ncl_flush() clears 2881 * the NMODIFIED flag and that shouldn't be done here for 2882 * directories. 2883 */ 2884 return (0); 2885 } 2886 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0)); 2887 } 2888 2889 /* 2890 * Flush all the blocks associated with a vnode. 2891 * Walk through the buffer pool and push any dirty pages 2892 * associated with the vnode. 2893 * If the called_from_renewthread argument is TRUE, it has been called 2894 * from the NFSv4 renew thread and, as such, cannot block indefinitely 2895 * waiting for a buffer write to complete. 2896 */ 2897 int 2898 ncl_flush(struct vnode *vp, int waitfor, struct thread *td, 2899 int commit, int called_from_renewthread) 2900 { 2901 struct nfsnode *np = VTONFS(vp); 2902 struct buf *bp; 2903 int i; 2904 struct buf *nbp; 2905 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2906 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2907 int passone = 1, trycnt = 0; 2908 u_quad_t off, endoff, toff; 2909 struct ucred* wcred = NULL; 2910 struct buf **bvec = NULL; 2911 struct bufobj *bo; 2912 #ifndef NFS_COMMITBVECSIZ 2913 #define NFS_COMMITBVECSIZ 20 2914 #endif 2915 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2916 u_int bvecsize = 0, bveccount; 2917 struct timespec ts; 2918 2919 if (called_from_renewthread != 0) 2920 slptimeo = hz; 2921 if (nmp->nm_flag & NFSMNT_INT) 2922 slpflag = PCATCH; 2923 if (!commit) 2924 passone = 0; 2925 bo = &vp->v_bufobj; 2926 /* 2927 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2928 * server, but has not been committed to stable storage on the server 2929 * yet. On the first pass, the byte range is worked out and the commit 2930 * rpc is done. On the second pass, ncl_writebp() is called to do the 2931 * job. 2932 */ 2933 again: 2934 off = (u_quad_t)-1; 2935 endoff = 0; 2936 bvecpos = 0; 2937 if (NFS_ISV34(vp) && commit) { 2938 if (bvec != NULL && bvec != bvec_on_stack) 2939 free(bvec, M_TEMP); 2940 /* 2941 * Count up how many buffers waiting for a commit. 2942 */ 2943 bveccount = 0; 2944 BO_LOCK(bo); 2945 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2946 if (!BUF_ISLOCKED(bp) && 2947 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2948 == (B_DELWRI | B_NEEDCOMMIT)) 2949 bveccount++; 2950 } 2951 /* 2952 * Allocate space to remember the list of bufs to commit. It is 2953 * important to use M_NOWAIT here to avoid a race with nfs_write. 2954 * If we can't get memory (for whatever reason), we will end up 2955 * committing the buffers one-by-one in the loop below. 2956 */ 2957 if (bveccount > NFS_COMMITBVECSIZ) { 2958 /* 2959 * Release the vnode interlock to avoid a lock 2960 * order reversal. 2961 */ 2962 BO_UNLOCK(bo); 2963 bvec = (struct buf **) 2964 malloc(bveccount * sizeof(struct buf *), 2965 M_TEMP, M_NOWAIT); 2966 BO_LOCK(bo); 2967 if (bvec == NULL) { 2968 bvec = bvec_on_stack; 2969 bvecsize = NFS_COMMITBVECSIZ; 2970 } else 2971 bvecsize = bveccount; 2972 } else { 2973 bvec = bvec_on_stack; 2974 bvecsize = NFS_COMMITBVECSIZ; 2975 } 2976 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2977 if (bvecpos >= bvecsize) 2978 break; 2979 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2980 nbp = TAILQ_NEXT(bp, b_bobufs); 2981 continue; 2982 } 2983 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2984 (B_DELWRI | B_NEEDCOMMIT)) { 2985 BUF_UNLOCK(bp); 2986 nbp = TAILQ_NEXT(bp, b_bobufs); 2987 continue; 2988 } 2989 BO_UNLOCK(bo); 2990 bremfree(bp); 2991 /* 2992 * Work out if all buffers are using the same cred 2993 * so we can deal with them all with one commit. 2994 * 2995 * NOTE: we are not clearing B_DONE here, so we have 2996 * to do it later on in this routine if we intend to 2997 * initiate I/O on the bp. 2998 * 2999 * Note: to avoid loopback deadlocks, we do not 3000 * assign b_runningbufspace. 3001 */ 3002 if (wcred == NULL) 3003 wcred = bp->b_wcred; 3004 else if (wcred != bp->b_wcred) 3005 wcred = NOCRED; 3006 vfs_busy_pages(bp, 1); 3007 3008 BO_LOCK(bo); 3009 /* 3010 * bp is protected by being locked, but nbp is not 3011 * and vfs_busy_pages() may sleep. We have to 3012 * recalculate nbp. 3013 */ 3014 nbp = TAILQ_NEXT(bp, b_bobufs); 3015 3016 /* 3017 * A list of these buffers is kept so that the 3018 * second loop knows which buffers have actually 3019 * been committed. This is necessary, since there 3020 * may be a race between the commit rpc and new 3021 * uncommitted writes on the file. 3022 */ 3023 bvec[bvecpos++] = bp; 3024 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3025 bp->b_dirtyoff; 3026 if (toff < off) 3027 off = toff; 3028 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 3029 if (toff > endoff) 3030 endoff = toff; 3031 } 3032 BO_UNLOCK(bo); 3033 } 3034 if (bvecpos > 0) { 3035 /* 3036 * Commit data on the server, as required. 3037 * If all bufs are using the same wcred, then use that with 3038 * one call for all of them, otherwise commit each one 3039 * separately. 3040 */ 3041 if (wcred != NOCRED) 3042 retv = ncl_commit(vp, off, (int)(endoff - off), 3043 wcred, td); 3044 else { 3045 retv = 0; 3046 for (i = 0; i < bvecpos; i++) { 3047 off_t off, size; 3048 bp = bvec[i]; 3049 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3050 bp->b_dirtyoff; 3051 size = (u_quad_t)(bp->b_dirtyend 3052 - bp->b_dirtyoff); 3053 retv = ncl_commit(vp, off, (int)size, 3054 bp->b_wcred, td); 3055 if (retv) break; 3056 } 3057 } 3058 3059 if (retv == NFSERR_STALEWRITEVERF) 3060 ncl_clearcommit(vp->v_mount); 3061 3062 /* 3063 * Now, either mark the blocks I/O done or mark the 3064 * blocks dirty, depending on whether the commit 3065 * succeeded. 3066 */ 3067 for (i = 0; i < bvecpos; i++) { 3068 bp = bvec[i]; 3069 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3070 if (!NFSCL_FORCEDISM(vp->v_mount) && retv) { 3071 /* 3072 * Error, leave B_DELWRI intact 3073 */ 3074 vfs_unbusy_pages(bp); 3075 brelse(bp); 3076 } else { 3077 /* 3078 * Success, remove B_DELWRI ( bundirty() ). 3079 * 3080 * b_dirtyoff/b_dirtyend seem to be NFS 3081 * specific. We should probably move that 3082 * into bundirty(). XXX 3083 */ 3084 bufobj_wref(bo); 3085 bp->b_flags |= B_ASYNC; 3086 bundirty(bp); 3087 bp->b_flags &= ~B_DONE; 3088 bp->b_ioflags &= ~BIO_ERROR; 3089 bp->b_dirtyoff = bp->b_dirtyend = 0; 3090 bufdone(bp); 3091 } 3092 } 3093 } 3094 3095 /* 3096 * Start/do any write(s) that are required. 3097 */ 3098 loop: 3099 BO_LOCK(bo); 3100 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3101 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3102 if (waitfor != MNT_WAIT || passone) 3103 continue; 3104 3105 error = BUF_TIMELOCK(bp, 3106 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 3107 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo); 3108 if (error == 0) { 3109 BUF_UNLOCK(bp); 3110 goto loop; 3111 } 3112 if (error == ENOLCK) { 3113 error = 0; 3114 goto loop; 3115 } 3116 if (called_from_renewthread != 0) { 3117 /* 3118 * Return EIO so the flush will be retried 3119 * later. 3120 */ 3121 error = EIO; 3122 goto done; 3123 } 3124 if (newnfs_sigintr(nmp, td)) { 3125 error = EINTR; 3126 goto done; 3127 } 3128 if (slpflag == PCATCH) { 3129 slpflag = 0; 3130 slptimeo = 2 * hz; 3131 } 3132 goto loop; 3133 } 3134 if ((bp->b_flags & B_DELWRI) == 0) 3135 panic("nfs_fsync: not dirty"); 3136 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3137 BUF_UNLOCK(bp); 3138 continue; 3139 } 3140 BO_UNLOCK(bo); 3141 bremfree(bp); 3142 bp->b_flags |= B_ASYNC; 3143 bwrite(bp); 3144 if (newnfs_sigintr(nmp, td)) { 3145 error = EINTR; 3146 goto done; 3147 } 3148 goto loop; 3149 } 3150 if (passone) { 3151 passone = 0; 3152 BO_UNLOCK(bo); 3153 goto again; 3154 } 3155 if (waitfor == MNT_WAIT) { 3156 while (bo->bo_numoutput) { 3157 error = bufobj_wwait(bo, slpflag, slptimeo); 3158 if (error) { 3159 BO_UNLOCK(bo); 3160 if (called_from_renewthread != 0) { 3161 /* 3162 * Return EIO so that the flush will be 3163 * retried later. 3164 */ 3165 error = EIO; 3166 goto done; 3167 } 3168 error = newnfs_sigintr(nmp, td); 3169 if (error) 3170 goto done; 3171 if (slpflag == PCATCH) { 3172 slpflag = 0; 3173 slptimeo = 2 * hz; 3174 } 3175 BO_LOCK(bo); 3176 } 3177 } 3178 if (bo->bo_dirty.bv_cnt != 0 && commit) { 3179 BO_UNLOCK(bo); 3180 goto loop; 3181 } 3182 /* 3183 * Wait for all the async IO requests to drain 3184 */ 3185 BO_UNLOCK(bo); 3186 NFSLOCKNODE(np); 3187 while (np->n_directio_asyncwr > 0) { 3188 np->n_flag |= NFSYNCWAIT; 3189 error = newnfs_msleep(td, &np->n_directio_asyncwr, 3190 &np->n_mtx, slpflag | (PRIBIO + 1), 3191 "nfsfsync", 0); 3192 if (error) { 3193 if (newnfs_sigintr(nmp, td)) { 3194 NFSUNLOCKNODE(np); 3195 error = EINTR; 3196 goto done; 3197 } 3198 } 3199 } 3200 NFSUNLOCKNODE(np); 3201 } else 3202 BO_UNLOCK(bo); 3203 if (NFSHASPNFS(nmp)) { 3204 nfscl_layoutcommit(vp, td); 3205 /* 3206 * Invalidate the attribute cache, since writes to a DS 3207 * won't update the size attribute. 3208 */ 3209 NFSLOCKNODE(np); 3210 np->n_attrstamp = 0; 3211 } else 3212 NFSLOCKNODE(np); 3213 if (np->n_flag & NWRITEERR) { 3214 error = np->n_error; 3215 np->n_flag &= ~NWRITEERR; 3216 } 3217 if (commit && bo->bo_dirty.bv_cnt == 0 && 3218 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) 3219 np->n_flag &= ~NMODIFIED; 3220 NFSUNLOCKNODE(np); 3221 done: 3222 if (bvec != NULL && bvec != bvec_on_stack) 3223 free(bvec, M_TEMP); 3224 if (error == 0 && commit != 0 && waitfor == MNT_WAIT && 3225 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 || 3226 np->n_directio_asyncwr != 0)) { 3227 if (trycnt++ < 5) { 3228 /* try, try again... */ 3229 passone = 1; 3230 wcred = NULL; 3231 bvec = NULL; 3232 bvecsize = 0; 3233 goto again; 3234 } 3235 vn_printf(vp, "ncl_flush failed"); 3236 error = called_from_renewthread != 0 ? EIO : EBUSY; 3237 } 3238 if (error == 0) { 3239 nanouptime(&ts); 3240 NFSLOCKNODE(np); 3241 np->n_localmodtime = ts; 3242 NFSUNLOCKNODE(np); 3243 } 3244 return (error); 3245 } 3246 3247 /* 3248 * NFS advisory byte-level locks. 3249 */ 3250 static int 3251 nfs_advlock(struct vop_advlock_args *ap) 3252 { 3253 struct vnode *vp = ap->a_vp; 3254 struct ucred *cred; 3255 struct nfsnode *np = VTONFS(ap->a_vp); 3256 struct proc *p = (struct proc *)ap->a_id; 3257 struct thread *td = curthread; /* XXX */ 3258 struct vattr va; 3259 int ret, error; 3260 u_quad_t size; 3261 struct nfsmount *nmp; 3262 3263 error = NFSVOPLOCK(vp, LK_SHARED); 3264 if (error != 0) 3265 return (EBADF); 3266 if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) { 3267 if (vp->v_type != VREG) { 3268 error = EINVAL; 3269 goto out; 3270 } 3271 if ((ap->a_flags & F_POSIX) != 0) 3272 cred = p->p_ucred; 3273 else 3274 cred = td->td_ucred; 3275 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 3276 if (VN_IS_DOOMED(vp)) { 3277 error = EBADF; 3278 goto out; 3279 } 3280 3281 /* 3282 * If this is unlocking a write locked region, flush and 3283 * commit them before unlocking. This is required by 3284 * RFC3530 Sec. 9.3.2. 3285 */ 3286 if (ap->a_op == F_UNLCK && 3287 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id, 3288 ap->a_flags)) 3289 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0); 3290 3291 /* 3292 * Mark NFS node as might have acquired a lock. 3293 * This is separate from NHASBEENLOCKED, because it must 3294 * be done before the nfsrpc_advlock() call, which might 3295 * add a nfscllock structure to the client state. 3296 * It is used to check for the case where a nfscllock 3297 * state structure cannot exist for the file. 3298 * Only done for "oneopenown" NFSv4.1/4.2 mounts. 3299 */ 3300 nmp = VFSTONFS(vp->v_mount); 3301 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp)) { 3302 NFSLOCKNODE(np); 3303 np->n_flag |= NMIGHTBELOCKED; 3304 NFSUNLOCKNODE(np); 3305 } 3306 3307 /* 3308 * Loop around doing the lock op, while a blocking lock 3309 * must wait for the lock op to succeed. 3310 */ 3311 do { 3312 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op, 3313 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags); 3314 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3315 ap->a_op == F_SETLK) { 3316 NFSVOPUNLOCK(vp); 3317 error = nfs_catnap(PZERO | PCATCH, ret, 3318 "ncladvl"); 3319 if (error) 3320 return (EINTR); 3321 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY); 3322 if (VN_IS_DOOMED(vp)) { 3323 error = EBADF; 3324 goto out; 3325 } 3326 } 3327 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3328 ap->a_op == F_SETLK); 3329 if (ret == NFSERR_DENIED) { 3330 error = EAGAIN; 3331 goto out; 3332 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) { 3333 error = ret; 3334 goto out; 3335 } else if (ret != 0) { 3336 error = EACCES; 3337 goto out; 3338 } 3339 3340 /* 3341 * Now, if we just got a lock, invalidate data in the buffer 3342 * cache, as required, so that the coherency conforms with 3343 * RFC3530 Sec. 9.3.2. 3344 */ 3345 if (ap->a_op == F_SETLK) { 3346 if ((np->n_flag & NMODIFIED) == 0) { 3347 np->n_attrstamp = 0; 3348 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3349 ret = VOP_GETATTR(vp, &va, cred); 3350 } 3351 if ((np->n_flag & NMODIFIED) || ret || 3352 np->n_change != va.va_filerev) { 3353 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1); 3354 np->n_attrstamp = 0; 3355 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3356 ret = VOP_GETATTR(vp, &va, cred); 3357 if (!ret) { 3358 np->n_mtime = va.va_mtime; 3359 np->n_change = va.va_filerev; 3360 } 3361 } 3362 /* Mark that a file lock has been acquired. */ 3363 NFSLOCKNODE(np); 3364 np->n_flag |= NHASBEENLOCKED; 3365 NFSUNLOCKNODE(np); 3366 } 3367 } else if (!NFS_ISV4(vp)) { 3368 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3369 size = VTONFS(vp)->n_size; 3370 NFSVOPUNLOCK(vp); 3371 error = lf_advlock(ap, &(vp->v_lockf), size); 3372 } else { 3373 if (nfs_advlock_p != NULL) 3374 error = nfs_advlock_p(ap); 3375 else { 3376 NFSVOPUNLOCK(vp); 3377 error = ENOLCK; 3378 } 3379 } 3380 if (error == 0 && ap->a_op == F_SETLK) { 3381 error = NFSVOPLOCK(vp, LK_SHARED); 3382 if (error == 0) { 3383 /* Mark that a file lock has been acquired. */ 3384 NFSLOCKNODE(np); 3385 np->n_flag |= NHASBEENLOCKED; 3386 NFSUNLOCKNODE(np); 3387 NFSVOPUNLOCK(vp); 3388 } 3389 } 3390 return (error); 3391 } else 3392 error = EOPNOTSUPP; 3393 out: 3394 NFSVOPUNLOCK(vp); 3395 return (error); 3396 } 3397 3398 /* 3399 * NFS advisory byte-level locks. 3400 */ 3401 static int 3402 nfs_advlockasync(struct vop_advlockasync_args *ap) 3403 { 3404 struct vnode *vp = ap->a_vp; 3405 u_quad_t size; 3406 int error; 3407 3408 if (NFS_ISV4(vp)) 3409 return (EOPNOTSUPP); 3410 error = NFSVOPLOCK(vp, LK_SHARED); 3411 if (error) 3412 return (error); 3413 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3414 size = VTONFS(vp)->n_size; 3415 NFSVOPUNLOCK(vp); 3416 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3417 } else { 3418 NFSVOPUNLOCK(vp); 3419 error = EOPNOTSUPP; 3420 } 3421 return (error); 3422 } 3423 3424 /* 3425 * Print out the contents of an nfsnode. 3426 */ 3427 static int 3428 nfs_print(struct vop_print_args *ap) 3429 { 3430 struct vnode *vp = ap->a_vp; 3431 struct nfsnode *np = VTONFS(vp); 3432 3433 printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid, 3434 (uintmax_t)np->n_vattr.na_fsid); 3435 if (vp->v_type == VFIFO) 3436 fifo_printinfo(vp); 3437 printf("\n"); 3438 return (0); 3439 } 3440 3441 /* 3442 * This is the "real" nfs::bwrite(struct buf*). 3443 * We set B_CACHE if this is a VMIO buffer. 3444 */ 3445 int 3446 ncl_writebp(struct buf *bp, int force __unused, struct thread *td) 3447 { 3448 int oldflags, rtval; 3449 3450 if (bp->b_flags & B_INVAL) { 3451 brelse(bp); 3452 return (0); 3453 } 3454 3455 oldflags = bp->b_flags; 3456 bp->b_flags |= B_CACHE; 3457 3458 /* 3459 * Undirty the bp. We will redirty it later if the I/O fails. 3460 */ 3461 bundirty(bp); 3462 bp->b_flags &= ~B_DONE; 3463 bp->b_ioflags &= ~BIO_ERROR; 3464 bp->b_iocmd = BIO_WRITE; 3465 3466 bufobj_wref(bp->b_bufobj); 3467 curthread->td_ru.ru_oublock++; 3468 3469 /* 3470 * Note: to avoid loopback deadlocks, we do not 3471 * assign b_runningbufspace. 3472 */ 3473 vfs_busy_pages(bp, 1); 3474 3475 BUF_KERNPROC(bp); 3476 bp->b_iooffset = dbtob(bp->b_blkno); 3477 bstrategy(bp); 3478 3479 if ((oldflags & B_ASYNC) != 0) 3480 return (0); 3481 3482 rtval = bufwait(bp); 3483 if (oldflags & B_DELWRI) 3484 reassignbuf(bp); 3485 brelse(bp); 3486 return (rtval); 3487 } 3488 3489 /* 3490 * nfs special file access vnode op. 3491 * Essentially just get vattr and then imitate iaccess() since the device is 3492 * local to the client. 3493 */ 3494 static int 3495 nfsspec_access(struct vop_access_args *ap) 3496 { 3497 struct vattr *vap; 3498 struct ucred *cred = ap->a_cred; 3499 struct vnode *vp = ap->a_vp; 3500 accmode_t accmode = ap->a_accmode; 3501 struct vattr vattr; 3502 int error; 3503 3504 /* 3505 * Disallow write attempts on filesystems mounted read-only; 3506 * unless the file is a socket, fifo, or a block or character 3507 * device resident on the filesystem. 3508 */ 3509 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3510 switch (vp->v_type) { 3511 case VREG: 3512 case VDIR: 3513 case VLNK: 3514 return (EROFS); 3515 default: 3516 break; 3517 } 3518 } 3519 vap = &vattr; 3520 error = VOP_GETATTR(vp, vap, cred); 3521 if (error) 3522 goto out; 3523 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3524 accmode, cred); 3525 out: 3526 return error; 3527 } 3528 3529 /* 3530 * Read wrapper for fifos. 3531 */ 3532 static int 3533 nfsfifo_read(struct vop_read_args *ap) 3534 { 3535 struct nfsnode *np = VTONFS(ap->a_vp); 3536 int error; 3537 3538 /* 3539 * Set access flag. 3540 */ 3541 NFSLOCKNODE(np); 3542 np->n_flag |= NACC; 3543 vfs_timestamp(&np->n_atim); 3544 NFSUNLOCKNODE(np); 3545 error = fifo_specops.vop_read(ap); 3546 return error; 3547 } 3548 3549 /* 3550 * Write wrapper for fifos. 3551 */ 3552 static int 3553 nfsfifo_write(struct vop_write_args *ap) 3554 { 3555 struct nfsnode *np = VTONFS(ap->a_vp); 3556 3557 /* 3558 * Set update flag. 3559 */ 3560 NFSLOCKNODE(np); 3561 np->n_flag |= NUPD; 3562 vfs_timestamp(&np->n_mtim); 3563 NFSUNLOCKNODE(np); 3564 return(fifo_specops.vop_write(ap)); 3565 } 3566 3567 /* 3568 * Close wrapper for fifos. 3569 * 3570 * Update the times on the nfsnode then do fifo close. 3571 */ 3572 static int 3573 nfsfifo_close(struct vop_close_args *ap) 3574 { 3575 struct vnode *vp = ap->a_vp; 3576 struct nfsnode *np = VTONFS(vp); 3577 struct vattr vattr; 3578 struct timespec ts; 3579 3580 NFSLOCKNODE(np); 3581 if (np->n_flag & (NACC | NUPD)) { 3582 vfs_timestamp(&ts); 3583 if (np->n_flag & NACC) 3584 np->n_atim = ts; 3585 if (np->n_flag & NUPD) 3586 np->n_mtim = ts; 3587 np->n_flag |= NCHG; 3588 if (vrefcnt(vp) == 1 && 3589 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3590 VATTR_NULL(&vattr); 3591 if (np->n_flag & NACC) 3592 vattr.va_atime = np->n_atim; 3593 if (np->n_flag & NUPD) 3594 vattr.va_mtime = np->n_mtim; 3595 NFSUNLOCKNODE(np); 3596 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3597 goto out; 3598 } 3599 } 3600 NFSUNLOCKNODE(np); 3601 out: 3602 return (fifo_specops.vop_close(ap)); 3603 } 3604 3605 /* 3606 * Just call ncl_writebp() with the force argument set to 1. 3607 * 3608 * NOTE: B_DONE may or may not be set in a_bp on call. 3609 */ 3610 static int 3611 nfs_bwrite(struct buf *bp) 3612 { 3613 3614 return (ncl_writebp(bp, 1, curthread)); 3615 } 3616 3617 struct buf_ops buf_ops_newnfs = { 3618 .bop_name = "buf_ops_nfs", 3619 .bop_write = nfs_bwrite, 3620 .bop_strategy = bufstrategy, 3621 .bop_sync = bufsync, 3622 .bop_bdflush = bufbdflush, 3623 }; 3624 3625 static int 3626 nfs_getacl(struct vop_getacl_args *ap) 3627 { 3628 int error; 3629 3630 if (ap->a_type != ACL_TYPE_NFS4) 3631 return (EOPNOTSUPP); 3632 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3633 NULL); 3634 if (error > NFSERR_STALE) { 3635 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3636 error = EPERM; 3637 } 3638 return (error); 3639 } 3640 3641 static int 3642 nfs_setacl(struct vop_setacl_args *ap) 3643 { 3644 int error; 3645 3646 if (ap->a_type != ACL_TYPE_NFS4) 3647 return (EOPNOTSUPP); 3648 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3649 NULL); 3650 if (error > NFSERR_STALE) { 3651 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3652 error = EPERM; 3653 } 3654 return (error); 3655 } 3656 3657 /* 3658 * VOP_ADVISE for NFS. 3659 * Just return 0 for any errors, since it is just a hint. 3660 */ 3661 static int 3662 nfs_advise(struct vop_advise_args *ap) 3663 { 3664 struct thread *td = curthread; 3665 struct nfsmount *nmp; 3666 uint64_t len; 3667 int error; 3668 3669 /* 3670 * First do vop_stdadvise() to handle the buffer cache. 3671 */ 3672 error = vop_stdadvise(ap); 3673 if (error != 0) 3674 return (error); 3675 if (ap->a_start < 0 || ap->a_end < 0) 3676 return (0); 3677 if (ap->a_end == OFF_MAX) 3678 len = 0; 3679 else if (ap->a_end < ap->a_start) 3680 return (0); 3681 else 3682 len = ap->a_end - ap->a_start + 1; 3683 nmp = VFSTONFS(ap->a_vp->v_mount); 3684 mtx_lock(&nmp->nm_mtx); 3685 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3686 (NFSHASPNFS(nmp) && (nmp->nm_privflag & NFSMNTP_IOADVISETHRUMDS) == 3687 0) || (nmp->nm_privflag & NFSMNTP_NOADVISE) != 0) { 3688 mtx_unlock(&nmp->nm_mtx); 3689 return (0); 3690 } 3691 mtx_unlock(&nmp->nm_mtx); 3692 error = nfsrpc_advise(ap->a_vp, ap->a_start, len, ap->a_advice, 3693 td->td_ucred, td); 3694 if (error == NFSERR_NOTSUPP) { 3695 mtx_lock(&nmp->nm_mtx); 3696 nmp->nm_privflag |= NFSMNTP_NOADVISE; 3697 mtx_unlock(&nmp->nm_mtx); 3698 } 3699 return (0); 3700 } 3701 3702 /* 3703 * nfs allocate call 3704 */ 3705 static int 3706 nfs_allocate(struct vop_allocate_args *ap) 3707 { 3708 struct vnode *vp = ap->a_vp; 3709 struct thread *td = curthread; 3710 struct nfsvattr nfsva; 3711 struct nfsmount *nmp; 3712 struct nfsnode *np; 3713 off_t alen; 3714 int attrflag, error, ret; 3715 struct timespec ts; 3716 3717 attrflag = 0; 3718 nmp = VFSTONFS(vp->v_mount); 3719 np = VTONFS(vp); 3720 mtx_lock(&nmp->nm_mtx); 3721 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION && 3722 (nmp->nm_privflag & NFSMNTP_NOALLOCATE) == 0) { 3723 mtx_unlock(&nmp->nm_mtx); 3724 /* 3725 * Flush first to ensure that the allocate adds to the 3726 * file's allocation on the server. 3727 */ 3728 error = ncl_flush(vp, MNT_WAIT, td, 1, 0); 3729 if (error == 0) { 3730 alen = *ap->a_len; 3731 if ((uint64_t)alen > nfs_maxalloclen) 3732 alen = nfs_maxalloclen; 3733 error = nfsrpc_allocate(vp, *ap->a_offset, alen, 3734 &nfsva, &attrflag, ap->a_cred, td, NULL); 3735 } 3736 if (error == 0) { 3737 *ap->a_offset += alen; 3738 *ap->a_len -= alen; 3739 nanouptime(&ts); 3740 NFSLOCKNODE(np); 3741 np->n_localmodtime = ts; 3742 NFSUNLOCKNODE(np); 3743 } else if (error == NFSERR_NOTSUPP) { 3744 mtx_lock(&nmp->nm_mtx); 3745 nmp->nm_privflag |= NFSMNTP_NOALLOCATE; 3746 mtx_unlock(&nmp->nm_mtx); 3747 error = EINVAL; 3748 } 3749 } else { 3750 mtx_unlock(&nmp->nm_mtx); 3751 error = EINVAL; 3752 } 3753 if (attrflag != 0) { 3754 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 3755 if (error == 0 && ret != 0) 3756 error = ret; 3757 } 3758 if (error != 0) 3759 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 3760 return (error); 3761 } 3762 3763 /* 3764 * nfs deallocate call 3765 */ 3766 static int 3767 nfs_deallocate(struct vop_deallocate_args *ap) 3768 { 3769 struct vnode *vp = ap->a_vp; 3770 struct thread *td = curthread; 3771 struct nfsvattr nfsva; 3772 struct nfsmount *nmp; 3773 struct nfsnode *np; 3774 off_t tlen, mlen; 3775 int attrflag, error, ret; 3776 bool clipped; 3777 struct timespec ts; 3778 3779 error = 0; 3780 attrflag = 0; 3781 nmp = VFSTONFS(vp->v_mount); 3782 np = VTONFS(vp); 3783 mtx_lock(&nmp->nm_mtx); 3784 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION && 3785 (nmp->nm_privflag & NFSMNTP_NODEALLOCATE) == 0) { 3786 mtx_unlock(&nmp->nm_mtx); 3787 tlen = omin(OFF_MAX - *ap->a_offset, *ap->a_len); 3788 NFSCL_DEBUG(4, "dealloc: off=%jd len=%jd maxfilesize=%ju\n", 3789 (intmax_t)*ap->a_offset, (intmax_t)tlen, 3790 (uintmax_t)nmp->nm_maxfilesize); 3791 if ((uint64_t)*ap->a_offset >= nmp->nm_maxfilesize) { 3792 /* Avoid EFBIG error return from the NFSv4.2 server. */ 3793 *ap->a_len = 0; 3794 return (0); 3795 } 3796 clipped = false; 3797 if ((uint64_t)*ap->a_offset + tlen > nmp->nm_maxfilesize) 3798 tlen = nmp->nm_maxfilesize - *ap->a_offset; 3799 if ((uint64_t)*ap->a_offset < np->n_size) { 3800 /* Limit the len to nfs_maxalloclen before EOF. */ 3801 mlen = omin((off_t)np->n_size - *ap->a_offset, tlen); 3802 if ((uint64_t)mlen > nfs_maxalloclen) { 3803 NFSCL_DEBUG(4, "dealloc: tlen maxalloclen\n"); 3804 tlen = nfs_maxalloclen; 3805 clipped = true; 3806 } 3807 } 3808 if (error == 0) 3809 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 3810 if (error == 0) { 3811 vnode_pager_purge_range(vp, *ap->a_offset, 3812 *ap->a_offset + tlen); 3813 error = nfsrpc_deallocate(vp, *ap->a_offset, tlen, 3814 &nfsva, &attrflag, ap->a_cred, td, NULL); 3815 NFSCL_DEBUG(4, "dealloc: rpc=%d\n", error); 3816 } 3817 if (error == 0) { 3818 NFSCL_DEBUG(4, "dealloc: attrflag=%d na_size=%ju\n", 3819 attrflag, (uintmax_t)nfsva.na_size); 3820 nanouptime(&ts); 3821 NFSLOCKNODE(np); 3822 np->n_localmodtime = ts; 3823 NFSUNLOCKNODE(np); 3824 if (attrflag != 0) { 3825 if ((uint64_t)*ap->a_offset < nfsva.na_size) 3826 *ap->a_offset += omin((off_t) 3827 nfsva.na_size - *ap->a_offset, 3828 tlen); 3829 } 3830 if (clipped && tlen < *ap->a_len) 3831 *ap->a_len -= tlen; 3832 else 3833 *ap->a_len = 0; 3834 } else if (error == NFSERR_NOTSUPP) { 3835 mtx_lock(&nmp->nm_mtx); 3836 nmp->nm_privflag |= NFSMNTP_NODEALLOCATE; 3837 mtx_unlock(&nmp->nm_mtx); 3838 } 3839 } else { 3840 mtx_unlock(&nmp->nm_mtx); 3841 error = EIO; 3842 } 3843 /* 3844 * If the NFS server cannot perform the Deallocate operation, just call 3845 * vop_stddeallocate() to perform it. 3846 */ 3847 if (error != 0 && error != NFSERR_FBIG && error != NFSERR_INVAL) { 3848 error = vop_stddeallocate(ap); 3849 NFSCL_DEBUG(4, "dealloc: stddeallocate=%d\n", error); 3850 } 3851 if (attrflag != 0) { 3852 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 3853 if (error == 0 && ret != 0) 3854 error = ret; 3855 } 3856 if (error != 0) 3857 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 3858 return (error); 3859 } 3860 3861 /* 3862 * nfs copy_file_range call 3863 */ 3864 static int 3865 nfs_copy_file_range(struct vop_copy_file_range_args *ap) 3866 { 3867 struct vnode *invp = ap->a_invp; 3868 struct vnode *outvp = ap->a_outvp; 3869 struct mount *mp; 3870 struct nfsvattr innfsva, outnfsva; 3871 struct vattr *vap; 3872 struct uio io; 3873 struct nfsmount *nmp; 3874 size_t len, len2; 3875 int error, inattrflag, outattrflag, ret, ret2; 3876 off_t inoff, outoff; 3877 bool consecutive, must_commit, tryoutcred; 3878 3879 ret = ret2 = 0; 3880 nmp = VFSTONFS(invp->v_mount); 3881 mtx_lock(&nmp->nm_mtx); 3882 /* NFSv4.2 Copy is not permitted for infile == outfile. */ 3883 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3884 (nmp->nm_privflag & NFSMNTP_NOCOPY) != 0 || invp == outvp) { 3885 mtx_unlock(&nmp->nm_mtx); 3886 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 3887 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, 3888 ap->a_incred, ap->a_outcred, ap->a_fsizetd); 3889 return (error); 3890 } 3891 mtx_unlock(&nmp->nm_mtx); 3892 3893 /* Lock both vnodes, avoiding risk of deadlock. */ 3894 do { 3895 mp = NULL; 3896 error = vn_start_write(outvp, &mp, V_WAIT); 3897 if (error == 0) { 3898 error = vn_lock(outvp, LK_EXCLUSIVE); 3899 if (error == 0) { 3900 error = vn_lock(invp, LK_SHARED | LK_NOWAIT); 3901 if (error == 0) 3902 break; 3903 VOP_UNLOCK(outvp); 3904 if (mp != NULL) 3905 vn_finished_write(mp); 3906 mp = NULL; 3907 error = vn_lock(invp, LK_SHARED); 3908 if (error == 0) 3909 VOP_UNLOCK(invp); 3910 } 3911 } 3912 if (mp != NULL) 3913 vn_finished_write(mp); 3914 } while (error == 0); 3915 if (error != 0) 3916 return (error); 3917 3918 /* 3919 * Do the vn_rlimit_fsize() check. Should this be above the VOP layer? 3920 */ 3921 io.uio_offset = *ap->a_outoffp; 3922 io.uio_resid = *ap->a_lenp; 3923 error = vn_rlimit_fsize(outvp, &io, ap->a_fsizetd); 3924 3925 /* 3926 * Flush the input file so that the data is up to date before 3927 * the copy. Flush writes for the output file so that they 3928 * do not overwrite the data copied to the output file by the Copy. 3929 * Set the commit argument for both flushes so that the data is on 3930 * stable storage before the Copy RPC. This is done in case the 3931 * server reboots during the Copy and needs to be redone. 3932 */ 3933 if (error == 0) 3934 error = ncl_flush(invp, MNT_WAIT, curthread, 1, 0); 3935 if (error == 0) 3936 error = ncl_flush(outvp, MNT_WAIT, curthread, 1, 0); 3937 3938 /* Do the actual NFSv4.2 RPC. */ 3939 len = *ap->a_lenp; 3940 mtx_lock(&nmp->nm_mtx); 3941 if ((nmp->nm_privflag & NFSMNTP_NOCONSECUTIVE) == 0) 3942 consecutive = true; 3943 else 3944 consecutive = false; 3945 mtx_unlock(&nmp->nm_mtx); 3946 inoff = *ap->a_inoffp; 3947 outoff = *ap->a_outoffp; 3948 tryoutcred = true; 3949 must_commit = false; 3950 if (error == 0) { 3951 vap = &VTONFS(invp)->n_vattr.na_vattr; 3952 error = VOP_GETATTR(invp, vap, ap->a_incred); 3953 if (error == 0) { 3954 /* 3955 * Clip "len" at va_size so that RFC compliant servers 3956 * will not reply NFSERR_INVAL. 3957 * Setting "len == 0" for the RPC would be preferred, 3958 * but some Linux servers do not support that. 3959 */ 3960 if (inoff >= vap->va_size) 3961 *ap->a_lenp = len = 0; 3962 else if (inoff + len > vap->va_size) 3963 *ap->a_lenp = len = vap->va_size - inoff; 3964 } else 3965 error = 0; 3966 } 3967 3968 /* 3969 * len will be set to 0 upon a successful Copy RPC. 3970 * As such, this only loops when the Copy RPC needs to be retried. 3971 */ 3972 while (len > 0 && error == 0) { 3973 inattrflag = outattrflag = 0; 3974 len2 = len; 3975 if (tryoutcred) 3976 error = nfsrpc_copy_file_range(invp, ap->a_inoffp, 3977 outvp, ap->a_outoffp, &len2, ap->a_flags, 3978 &inattrflag, &innfsva, &outattrflag, &outnfsva, 3979 ap->a_outcred, consecutive, &must_commit); 3980 else 3981 error = nfsrpc_copy_file_range(invp, ap->a_inoffp, 3982 outvp, ap->a_outoffp, &len2, ap->a_flags, 3983 &inattrflag, &innfsva, &outattrflag, &outnfsva, 3984 ap->a_incred, consecutive, &must_commit); 3985 if (inattrflag != 0) 3986 ret = nfscl_loadattrcache(&invp, &innfsva, NULL, NULL, 3987 0, 1); 3988 if (outattrflag != 0) 3989 ret2 = nfscl_loadattrcache(&outvp, &outnfsva, NULL, 3990 NULL, 1, 1); 3991 if (error == 0) { 3992 if (consecutive == false) { 3993 if (len2 == len) { 3994 mtx_lock(&nmp->nm_mtx); 3995 nmp->nm_privflag |= 3996 NFSMNTP_NOCONSECUTIVE; 3997 mtx_unlock(&nmp->nm_mtx); 3998 } else 3999 error = NFSERR_OFFLOADNOREQS; 4000 } 4001 *ap->a_lenp = len2; 4002 len = 0; 4003 if (len2 > 0 && must_commit && error == 0) 4004 error = ncl_commit(outvp, outoff, *ap->a_lenp, 4005 ap->a_outcred, curthread); 4006 if (error == 0 && ret != 0) 4007 error = ret; 4008 if (error == 0 && ret2 != 0) 4009 error = ret2; 4010 } else if (error == NFSERR_OFFLOADNOREQS && consecutive) { 4011 /* 4012 * Try consecutive == false, which is ok only if all 4013 * bytes are copied. 4014 * If only some bytes were copied when consecutive 4015 * is false, there is no way to know which bytes 4016 * still need to be written. 4017 */ 4018 consecutive = false; 4019 error = 0; 4020 } else if (error == NFSERR_ACCES && tryoutcred) { 4021 /* Try again with incred. */ 4022 tryoutcred = false; 4023 error = 0; 4024 } 4025 if (error == NFSERR_STALEWRITEVERF) { 4026 /* 4027 * Server rebooted, so do it all again. 4028 */ 4029 *ap->a_inoffp = inoff; 4030 *ap->a_outoffp = outoff; 4031 len = *ap->a_lenp; 4032 must_commit = false; 4033 error = 0; 4034 } 4035 } 4036 VOP_UNLOCK(invp); 4037 VOP_UNLOCK(outvp); 4038 if (mp != NULL) 4039 vn_finished_write(mp); 4040 if (error == NFSERR_NOTSUPP || error == NFSERR_OFFLOADNOREQS || 4041 error == NFSERR_ACCES) { 4042 /* 4043 * Unlike the NFSv4.2 Copy, vn_generic_copy_file_range() can 4044 * use a_incred for the read and a_outcred for the write, so 4045 * try this for NFSERR_ACCES failures for the Copy. 4046 * For NFSERR_NOTSUPP and NFSERR_OFFLOADNOREQS, the Copy can 4047 * never succeed, so disable it. 4048 */ 4049 if (error != NFSERR_ACCES) { 4050 /* Can never do Copy on this mount. */ 4051 mtx_lock(&nmp->nm_mtx); 4052 nmp->nm_privflag |= NFSMNTP_NOCOPY; 4053 mtx_unlock(&nmp->nm_mtx); 4054 } 4055 *ap->a_inoffp = inoff; 4056 *ap->a_outoffp = outoff; 4057 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 4058 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, 4059 ap->a_incred, ap->a_outcred, ap->a_fsizetd); 4060 } else if (error != 0) 4061 *ap->a_lenp = 0; 4062 4063 if (error != 0) 4064 error = nfscl_maperr(curthread, error, (uid_t)0, (gid_t)0); 4065 return (error); 4066 } 4067 4068 /* 4069 * nfs ioctl call 4070 */ 4071 static int 4072 nfs_ioctl(struct vop_ioctl_args *ap) 4073 { 4074 struct vnode *vp = ap->a_vp; 4075 struct nfsvattr nfsva; 4076 struct nfsmount *nmp; 4077 int attrflag, content, error, ret; 4078 bool eof = false; /* shut up compiler. */ 4079 4080 if (vp->v_type != VREG) 4081 return (ENOTTY); 4082 nmp = VFSTONFS(vp->v_mount); 4083 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) { 4084 error = vop_stdioctl(ap); 4085 return (error); 4086 } 4087 4088 /* Do the actual NFSv4.2 RPC. */ 4089 switch (ap->a_command) { 4090 case FIOSEEKDATA: 4091 content = NFSV4CONTENT_DATA; 4092 break; 4093 case FIOSEEKHOLE: 4094 content = NFSV4CONTENT_HOLE; 4095 break; 4096 default: 4097 return (ENOTTY); 4098 } 4099 4100 error = vn_lock(vp, LK_SHARED); 4101 if (error != 0) 4102 return (EBADF); 4103 attrflag = 0; 4104 if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size) 4105 error = ENXIO; 4106 else { 4107 /* 4108 * Flush all writes, so that the server is up to date. 4109 * Although a Commit is not required, the commit argument 4110 * is set so that, for a pNFS File/Flexible File Layout 4111 * server, the LayoutCommit will be done to ensure the file 4112 * size is up to date on the Metadata Server. 4113 */ 4114 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0); 4115 if (error == 0) 4116 error = nfsrpc_seek(vp, (off_t *)ap->a_data, &eof, 4117 content, ap->a_cred, &nfsva, &attrflag); 4118 /* If at eof for FIOSEEKDATA, return ENXIO. */ 4119 if (eof && error == 0 && content == NFSV4CONTENT_DATA) 4120 error = ENXIO; 4121 } 4122 if (attrflag != 0) { 4123 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4124 if (error == 0 && ret != 0) 4125 error = ret; 4126 } 4127 NFSVOPUNLOCK(vp); 4128 4129 if (error != 0) 4130 error = ENXIO; 4131 return (error); 4132 } 4133 4134 /* 4135 * nfs getextattr call 4136 */ 4137 static int 4138 nfs_getextattr(struct vop_getextattr_args *ap) 4139 { 4140 struct vnode *vp = ap->a_vp; 4141 struct nfsmount *nmp; 4142 struct ucred *cred; 4143 struct thread *td = ap->a_td; 4144 struct nfsvattr nfsva; 4145 ssize_t len; 4146 int attrflag, error, ret; 4147 4148 nmp = VFSTONFS(vp->v_mount); 4149 mtx_lock(&nmp->nm_mtx); 4150 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4151 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4152 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4153 mtx_unlock(&nmp->nm_mtx); 4154 return (EOPNOTSUPP); 4155 } 4156 mtx_unlock(&nmp->nm_mtx); 4157 4158 cred = ap->a_cred; 4159 if (cred == NULL) 4160 cred = td->td_ucred; 4161 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4162 attrflag = 0; 4163 error = nfsrpc_getextattr(vp, ap->a_name, ap->a_uio, &len, &nfsva, 4164 &attrflag, cred, td); 4165 if (attrflag != 0) { 4166 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4167 if (error == 0 && ret != 0) 4168 error = ret; 4169 } 4170 if (error == 0 && ap->a_size != NULL) 4171 *ap->a_size = len; 4172 4173 switch (error) { 4174 case NFSERR_NOTSUPP: 4175 case NFSERR_OPILLEGAL: 4176 mtx_lock(&nmp->nm_mtx); 4177 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4178 mtx_unlock(&nmp->nm_mtx); 4179 error = EOPNOTSUPP; 4180 break; 4181 case NFSERR_NOXATTR: 4182 case NFSERR_XATTR2BIG: 4183 error = ENOATTR; 4184 break; 4185 default: 4186 error = nfscl_maperr(td, error, 0, 0); 4187 break; 4188 } 4189 return (error); 4190 } 4191 4192 /* 4193 * nfs setextattr call 4194 */ 4195 static int 4196 nfs_setextattr(struct vop_setextattr_args *ap) 4197 { 4198 struct vnode *vp = ap->a_vp; 4199 struct nfsmount *nmp; 4200 struct ucred *cred; 4201 struct thread *td = ap->a_td; 4202 struct nfsvattr nfsva; 4203 int attrflag, error, ret; 4204 4205 nmp = VFSTONFS(vp->v_mount); 4206 mtx_lock(&nmp->nm_mtx); 4207 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4208 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4209 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4210 mtx_unlock(&nmp->nm_mtx); 4211 return (EOPNOTSUPP); 4212 } 4213 mtx_unlock(&nmp->nm_mtx); 4214 4215 if (ap->a_uio->uio_resid < 0) 4216 return (EINVAL); 4217 cred = ap->a_cred; 4218 if (cred == NULL) 4219 cred = td->td_ucred; 4220 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4221 attrflag = 0; 4222 error = nfsrpc_setextattr(vp, ap->a_name, ap->a_uio, &nfsva, 4223 &attrflag, cred, td); 4224 if (attrflag != 0) { 4225 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4226 if (error == 0 && ret != 0) 4227 error = ret; 4228 } 4229 4230 switch (error) { 4231 case NFSERR_NOTSUPP: 4232 case NFSERR_OPILLEGAL: 4233 mtx_lock(&nmp->nm_mtx); 4234 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4235 mtx_unlock(&nmp->nm_mtx); 4236 error = EOPNOTSUPP; 4237 break; 4238 case NFSERR_NOXATTR: 4239 case NFSERR_XATTR2BIG: 4240 error = ENOATTR; 4241 break; 4242 default: 4243 error = nfscl_maperr(td, error, 0, 0); 4244 break; 4245 } 4246 return (error); 4247 } 4248 4249 /* 4250 * nfs listextattr call 4251 */ 4252 static int 4253 nfs_listextattr(struct vop_listextattr_args *ap) 4254 { 4255 struct vnode *vp = ap->a_vp; 4256 struct nfsmount *nmp; 4257 struct ucred *cred; 4258 struct thread *td = ap->a_td; 4259 struct nfsvattr nfsva; 4260 size_t len, len2; 4261 uint64_t cookie; 4262 int attrflag, error, ret; 4263 bool eof; 4264 4265 nmp = VFSTONFS(vp->v_mount); 4266 mtx_lock(&nmp->nm_mtx); 4267 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4268 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4269 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4270 mtx_unlock(&nmp->nm_mtx); 4271 return (EOPNOTSUPP); 4272 } 4273 mtx_unlock(&nmp->nm_mtx); 4274 4275 cred = ap->a_cred; 4276 if (cred == NULL) 4277 cred = td->td_ucred; 4278 4279 /* Loop around doing List Extended Attribute RPCs. */ 4280 eof = false; 4281 cookie = 0; 4282 len2 = 0; 4283 error = 0; 4284 while (!eof && error == 0) { 4285 len = nmp->nm_rsize; 4286 attrflag = 0; 4287 error = nfsrpc_listextattr(vp, &cookie, ap->a_uio, &len, &eof, 4288 &nfsva, &attrflag, cred, td); 4289 if (attrflag != 0) { 4290 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 4291 1); 4292 if (error == 0 && ret != 0) 4293 error = ret; 4294 } 4295 if (error == 0) { 4296 len2 += len; 4297 if (len2 > SSIZE_MAX) 4298 error = ENOATTR; 4299 } 4300 } 4301 if (error == 0 && ap->a_size != NULL) 4302 *ap->a_size = len2; 4303 4304 switch (error) { 4305 case NFSERR_NOTSUPP: 4306 case NFSERR_OPILLEGAL: 4307 mtx_lock(&nmp->nm_mtx); 4308 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4309 mtx_unlock(&nmp->nm_mtx); 4310 error = EOPNOTSUPP; 4311 break; 4312 case NFSERR_NOXATTR: 4313 case NFSERR_XATTR2BIG: 4314 error = ENOATTR; 4315 break; 4316 default: 4317 error = nfscl_maperr(td, error, 0, 0); 4318 break; 4319 } 4320 return (error); 4321 } 4322 4323 /* 4324 * nfs setextattr call 4325 */ 4326 static int 4327 nfs_deleteextattr(struct vop_deleteextattr_args *ap) 4328 { 4329 struct vnode *vp = ap->a_vp; 4330 struct nfsmount *nmp; 4331 struct nfsvattr nfsva; 4332 int attrflag, error, ret; 4333 4334 nmp = VFSTONFS(vp->v_mount); 4335 mtx_lock(&nmp->nm_mtx); 4336 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4337 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4338 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4339 mtx_unlock(&nmp->nm_mtx); 4340 return (EOPNOTSUPP); 4341 } 4342 mtx_unlock(&nmp->nm_mtx); 4343 4344 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4345 attrflag = 0; 4346 error = nfsrpc_rmextattr(vp, ap->a_name, &nfsva, &attrflag, ap->a_cred, 4347 ap->a_td); 4348 if (attrflag != 0) { 4349 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4350 if (error == 0 && ret != 0) 4351 error = ret; 4352 } 4353 4354 switch (error) { 4355 case NFSERR_NOTSUPP: 4356 case NFSERR_OPILLEGAL: 4357 mtx_lock(&nmp->nm_mtx); 4358 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4359 mtx_unlock(&nmp->nm_mtx); 4360 error = EOPNOTSUPP; 4361 break; 4362 case NFSERR_NOXATTR: 4363 case NFSERR_XATTR2BIG: 4364 error = ENOATTR; 4365 break; 4366 default: 4367 error = nfscl_maperr(ap->a_td, error, 0, 0); 4368 break; 4369 } 4370 return (error); 4371 } 4372 4373 /* 4374 * Return POSIX pathconf information applicable to nfs filesystems. 4375 */ 4376 static int 4377 nfs_pathconf(struct vop_pathconf_args *ap) 4378 { 4379 struct nfsv3_pathconf pc; 4380 struct nfsvattr nfsva; 4381 struct vnode *vp = ap->a_vp; 4382 struct nfsmount *nmp; 4383 struct thread *td = curthread; 4384 off_t off; 4385 bool eof; 4386 int attrflag, error; 4387 4388 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX || 4389 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED || 4390 ap->a_name == _PC_NO_TRUNC)) || 4391 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) { 4392 /* 4393 * Since only the above 4 a_names are returned by the NFSv3 4394 * Pathconf RPC, there is no point in doing it for others. 4395 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can 4396 * be used for _PC_NFS4_ACL as well. 4397 */ 4398 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva, 4399 &attrflag, NULL); 4400 if (attrflag != 0) 4401 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 4402 1); 4403 if (error != 0) 4404 return (error); 4405 } else { 4406 /* 4407 * For NFSv2 (or NFSv3 when not one of the above 4 a_names), 4408 * just fake them. 4409 */ 4410 pc.pc_linkmax = NFS_LINK_MAX; 4411 pc.pc_namemax = NFS_MAXNAMLEN; 4412 pc.pc_notrunc = 1; 4413 pc.pc_chownrestricted = 1; 4414 pc.pc_caseinsensitive = 0; 4415 pc.pc_casepreserving = 1; 4416 error = 0; 4417 } 4418 switch (ap->a_name) { 4419 case _PC_LINK_MAX: 4420 #ifdef _LP64 4421 *ap->a_retval = pc.pc_linkmax; 4422 #else 4423 *ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax); 4424 #endif 4425 break; 4426 case _PC_NAME_MAX: 4427 *ap->a_retval = pc.pc_namemax; 4428 break; 4429 case _PC_PIPE_BUF: 4430 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 4431 *ap->a_retval = PIPE_BUF; 4432 else 4433 error = EINVAL; 4434 break; 4435 case _PC_CHOWN_RESTRICTED: 4436 *ap->a_retval = pc.pc_chownrestricted; 4437 break; 4438 case _PC_NO_TRUNC: 4439 *ap->a_retval = pc.pc_notrunc; 4440 break; 4441 case _PC_ACL_NFS4: 4442 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 && 4443 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL)) 4444 *ap->a_retval = 1; 4445 else 4446 *ap->a_retval = 0; 4447 break; 4448 case _PC_ACL_PATH_MAX: 4449 if (NFS_ISV4(vp)) 4450 *ap->a_retval = ACL_MAX_ENTRIES; 4451 else 4452 *ap->a_retval = 3; 4453 break; 4454 case _PC_PRIO_IO: 4455 *ap->a_retval = 0; 4456 break; 4457 case _PC_SYNC_IO: 4458 *ap->a_retval = 0; 4459 break; 4460 case _PC_ALLOC_SIZE_MIN: 4461 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize; 4462 break; 4463 case _PC_FILESIZEBITS: 4464 if (NFS_ISV34(vp)) 4465 *ap->a_retval = 64; 4466 else 4467 *ap->a_retval = 32; 4468 break; 4469 case _PC_REC_INCR_XFER_SIZE: 4470 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4471 break; 4472 case _PC_REC_MAX_XFER_SIZE: 4473 *ap->a_retval = -1; /* means ``unlimited'' */ 4474 break; 4475 case _PC_REC_MIN_XFER_SIZE: 4476 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4477 break; 4478 case _PC_REC_XFER_ALIGN: 4479 *ap->a_retval = PAGE_SIZE; 4480 break; 4481 case _PC_SYMLINK_MAX: 4482 *ap->a_retval = NFS_MAXPATHLEN; 4483 break; 4484 case _PC_MIN_HOLE_SIZE: 4485 /* Only some NFSv4.2 servers support Seek for Holes. */ 4486 *ap->a_retval = 0; 4487 nmp = VFSTONFS(vp->v_mount); 4488 if (NFS_ISV4(vp) && nmp->nm_minorvers == NFSV42_MINORVERSION) { 4489 /* 4490 * NFSv4.2 doesn't have an attribute for hole size, 4491 * so all we can do is see if the Seek operation is 4492 * supported and then use f_iosize as a "best guess". 4493 */ 4494 mtx_lock(&nmp->nm_mtx); 4495 if ((nmp->nm_privflag & NFSMNTP_SEEKTESTED) == 0) { 4496 mtx_unlock(&nmp->nm_mtx); 4497 off = 0; 4498 attrflag = 0; 4499 error = nfsrpc_seek(vp, &off, &eof, 4500 NFSV4CONTENT_HOLE, td->td_ucred, &nfsva, 4501 &attrflag); 4502 if (attrflag != 0) 4503 nfscl_loadattrcache(&vp, &nfsva, 4504 NULL, NULL, 0, 1); 4505 mtx_lock(&nmp->nm_mtx); 4506 if (error == NFSERR_NOTSUPP) 4507 nmp->nm_privflag |= NFSMNTP_SEEKTESTED; 4508 else 4509 nmp->nm_privflag |= NFSMNTP_SEEKTESTED | 4510 NFSMNTP_SEEK; 4511 error = 0; 4512 } 4513 if ((nmp->nm_privflag & NFSMNTP_SEEK) != 0) 4514 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4515 mtx_unlock(&nmp->nm_mtx); 4516 } 4517 break; 4518 4519 default: 4520 error = vop_stdpathconf(ap); 4521 break; 4522 } 4523 return (error); 4524 } 4525