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 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 651 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 652 if (VN_IS_DOOMED(vp)) 653 return (EBADF); 654 } 655 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 656 if (error == EINTR || error == EIO) { 657 if (NFS_ISV4(vp)) 658 (void) nfsrpc_close(vp, 0, ap->a_td); 659 return (error); 660 } 661 NFSLOCKNODE(np); 662 np->n_attrstamp = 0; 663 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 664 if (vp->v_type == VDIR) 665 np->n_direofoffset = 0; 666 NFSUNLOCKNODE(np); 667 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 668 if (error) { 669 if (NFS_ISV4(vp)) 670 (void) nfsrpc_close(vp, 0, ap->a_td); 671 return (error); 672 } 673 NFSLOCKNODE(np); 674 np->n_mtime = vattr.va_mtime; 675 if (NFS_ISV4(vp)) 676 np->n_change = vattr.va_filerev; 677 } else { 678 NFSUNLOCKNODE(np); 679 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 680 if (error) { 681 if (NFS_ISV4(vp)) 682 (void) nfsrpc_close(vp, 0, ap->a_td); 683 return (error); 684 } 685 NFSLOCKNODE(np); 686 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) || 687 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 688 if (vp->v_type == VDIR) 689 np->n_direofoffset = 0; 690 NFSUNLOCKNODE(np); 691 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 692 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 693 if (VN_IS_DOOMED(vp)) 694 return (EBADF); 695 } 696 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 697 if (error == EINTR || error == EIO) { 698 if (NFS_ISV4(vp)) 699 (void) nfsrpc_close(vp, 0, ap->a_td); 700 return (error); 701 } 702 NFSLOCKNODE(np); 703 np->n_mtime = vattr.va_mtime; 704 if (NFS_ISV4(vp)) 705 np->n_change = vattr.va_filerev; 706 } 707 } 708 709 /* 710 * If the object has >= 1 O_DIRECT active opens, we disable caching. 711 */ 712 if (newnfs_directio_enable && (fmode & O_DIRECT) && 713 (vp->v_type == VREG)) { 714 if (np->n_directio_opens == 0) { 715 NFSUNLOCKNODE(np); 716 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 717 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 718 if (VN_IS_DOOMED(vp)) 719 return (EBADF); 720 } 721 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 722 if (error) { 723 if (NFS_ISV4(vp)) 724 (void) nfsrpc_close(vp, 0, ap->a_td); 725 return (error); 726 } 727 NFSLOCKNODE(np); 728 np->n_flag |= NNONCACHE; 729 } 730 np->n_directio_opens++; 731 } 732 733 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */ 734 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0) 735 np->n_flag |= NWRITEOPENED; 736 737 /* 738 * If this is an open for writing, capture a reference to the 739 * credentials, so they can be used by ncl_putpages(). Using 740 * these write credentials is preferable to the credentials of 741 * whatever thread happens to be doing the VOP_PUTPAGES() since 742 * the write RPCs are less likely to fail with EACCES. 743 */ 744 if ((fmode & FWRITE) != 0) { 745 cred = np->n_writecred; 746 np->n_writecred = crhold(ap->a_cred); 747 } else 748 cred = NULL; 749 NFSUNLOCKNODE(np); 750 751 if (cred != NULL) 752 crfree(cred); 753 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 754 755 /* 756 * If the text file has been mmap'd, flush any dirty pages to the 757 * buffer cache and then... 758 * Make sure all writes are pushed to the NFS server. If this is not 759 * done, the modify time of the file can change while the text 760 * file is being executed. This will cause the process that is 761 * executing the text file to be terminated. 762 */ 763 if (vp->v_writecount <= -1) { 764 if ((obj = vp->v_object) != NULL && 765 vm_object_mightbedirty(obj)) { 766 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 767 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 768 if (VN_IS_DOOMED(vp)) 769 return (EBADF); 770 } 771 VM_OBJECT_WLOCK(obj); 772 vm_object_page_clean(obj, 0, 0, OBJPC_SYNC); 773 VM_OBJECT_WUNLOCK(obj); 774 } 775 776 /* Now, flush the buffer cache. */ 777 ncl_flush(vp, MNT_WAIT, curthread, 0, 0); 778 779 /* And, finally, make sure that n_mtime is up to date. */ 780 np = VTONFS(vp); 781 NFSLOCKNODE(np); 782 np->n_mtime = np->n_vattr.na_mtime; 783 NFSUNLOCKNODE(np); 784 } 785 return (0); 786 } 787 788 /* 789 * nfs close vnode op 790 * What an NFS client should do upon close after writing is a debatable issue. 791 * Most NFS clients push delayed writes to the server upon close, basically for 792 * two reasons: 793 * 1 - So that any write errors may be reported back to the client process 794 * doing the close system call. By far the two most likely errors are 795 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 796 * 2 - To put a worst case upper bound on cache inconsistency between 797 * multiple clients for the file. 798 * There is also a consistency problem for Version 2 of the protocol w.r.t. 799 * not being able to tell if other clients are writing a file concurrently, 800 * since there is no way of knowing if the changed modify time in the reply 801 * is only due to the write for this client. 802 * (NFS Version 3 provides weak cache consistency data in the reply that 803 * should be sufficient to detect and handle this case.) 804 * 805 * The current code does the following: 806 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 807 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 808 * or commit them (this satisfies 1 and 2 except for the 809 * case where the server crashes after this close but 810 * before the commit RPC, which is felt to be "good 811 * enough". Changing the last argument to ncl_flush() to 812 * a 1 would force a commit operation, if it is felt a 813 * commit is necessary now. 814 * for NFS Version 4 - flush the dirty buffers and commit them, if 815 * nfscl_mustflush() says this is necessary. 816 * It is necessary if there is no write delegation held, 817 * in order to satisfy open/close coherency. 818 * If the file isn't cached on local stable storage, 819 * it may be necessary in order to detect "out of space" 820 * errors from the server, if the write delegation 821 * issued by the server doesn't allow the file to grow. 822 */ 823 /* ARGSUSED */ 824 static int 825 nfs_close(struct vop_close_args *ap) 826 { 827 struct vnode *vp = ap->a_vp; 828 struct nfsnode *np = VTONFS(vp); 829 struct nfsvattr nfsva; 830 struct ucred *cred; 831 int error = 0, ret, localcred = 0; 832 int fmode = ap->a_fflag; 833 834 if (NFSCL_FORCEDISM(vp->v_mount)) 835 return (0); 836 /* 837 * During shutdown, a_cred isn't valid, so just use root. 838 */ 839 if (ap->a_cred == NOCRED) { 840 cred = newnfs_getcred(); 841 localcred = 1; 842 } else { 843 cred = ap->a_cred; 844 } 845 if (vp->v_type == VREG) { 846 /* 847 * Examine and clean dirty pages, regardless of NMODIFIED. 848 * This closes a major hole in close-to-open consistency. 849 * We want to push out all dirty pages (and buffers) on 850 * close, regardless of whether they were dirtied by 851 * mmap'ed writes or via write(). 852 */ 853 if (nfs_clean_pages_on_close && vp->v_object) { 854 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 855 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 856 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK) 857 return (EBADF); 858 } 859 VM_OBJECT_WLOCK(vp->v_object); 860 vm_object_page_clean(vp->v_object, 0, 0, 0); 861 VM_OBJECT_WUNLOCK(vp->v_object); 862 } 863 NFSLOCKNODE(np); 864 if (np->n_flag & NMODIFIED) { 865 NFSUNLOCKNODE(np); 866 if (NFS_ISV3(vp)) { 867 /* 868 * Under NFSv3 we have dirty buffers to dispose of. We 869 * must flush them to the NFS server. We have the option 870 * of waiting all the way through the commit rpc or just 871 * waiting for the initial write. The default is to only 872 * wait through the initial write so the data is in the 873 * server's cache, which is roughly similar to the state 874 * a standard disk subsystem leaves the file in on close(). 875 * 876 * We cannot clear the NMODIFIED bit in np->n_flag due to 877 * potential races with other processes, and certainly 878 * cannot clear it if we don't commit. 879 * These races occur when there is no longer the old 880 * traditional vnode locking implemented for Vnode Ops. 881 */ 882 int cm = newnfs_commit_on_close ? 1 : 0; 883 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 884 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 885 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK) 886 return (EBADF); 887 } 888 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0); 889 /* np->n_flag &= ~NMODIFIED; */ 890 } else if (NFS_ISV4(vp)) { 891 if (nfscl_mustflush(vp) != 0) { 892 int cm = newnfs_commit_on_close ? 1 : 0; 893 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 894 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 895 if (VN_IS_DOOMED(vp) && ap->a_fflag != 896 FNONBLOCK) 897 return (EBADF); 898 } 899 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 900 cm, 0); 901 /* 902 * as above w.r.t races when clearing 903 * NMODIFIED. 904 * np->n_flag &= ~NMODIFIED; 905 */ 906 } 907 } else { 908 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 909 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 910 if (VN_IS_DOOMED(vp) && ap->a_fflag != 911 FNONBLOCK) 912 return (EBADF); 913 } 914 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 915 } 916 NFSLOCKNODE(np); 917 } 918 /* 919 * Invalidate the attribute cache in all cases. 920 * An open is going to fetch fresh attrs any way, other procs 921 * on this node that have file open will be forced to do an 922 * otw attr fetch, but this is safe. 923 * --> A user found that their RPC count dropped by 20% when 924 * this was commented out and I can't see any requirement 925 * for it, so I've disabled it when negative lookups are 926 * enabled. (What does this have to do with negative lookup 927 * caching? Well nothing, except it was reported by the 928 * same user that needed negative lookup caching and I wanted 929 * there to be a way to disable it to see if it 930 * is the cause of some caching/coherency issue that might 931 * crop up.) 932 */ 933 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) { 934 np->n_attrstamp = 0; 935 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 936 } 937 if (np->n_flag & NWRITEERR) { 938 np->n_flag &= ~NWRITEERR; 939 error = np->n_error; 940 } 941 NFSUNLOCKNODE(np); 942 } 943 944 if (NFS_ISV4(vp)) { 945 /* 946 * Get attributes so "change" is up to date. 947 */ 948 if (error == 0 && nfscl_mustflush(vp) != 0 && 949 vp->v_type == VREG && 950 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) { 951 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva, 952 NULL); 953 if (!ret) { 954 np->n_change = nfsva.na_filerev; 955 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 956 NULL, 0, 0); 957 } 958 } 959 960 /* 961 * and do the close. 962 */ 963 ret = nfsrpc_close(vp, 0, ap->a_td); 964 if (!error && ret) 965 error = ret; 966 if (error) 967 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 968 (gid_t)0); 969 } 970 if (newnfs_directio_enable) 971 KASSERT((np->n_directio_asyncwr == 0), 972 ("nfs_close: dirty unflushed (%d) directio buffers\n", 973 np->n_directio_asyncwr)); 974 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 975 NFSLOCKNODE(np); 976 KASSERT((np->n_directio_opens > 0), 977 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 978 np->n_directio_opens--; 979 if (np->n_directio_opens == 0) 980 np->n_flag &= ~NNONCACHE; 981 NFSUNLOCKNODE(np); 982 } 983 if (localcred) 984 NFSFREECRED(cred); 985 return (error); 986 } 987 988 /* 989 * nfs getattr call from vfs. 990 */ 991 static int 992 nfs_getattr(struct vop_getattr_args *ap) 993 { 994 struct vnode *vp = ap->a_vp; 995 struct thread *td = curthread; /* XXX */ 996 struct nfsnode *np = VTONFS(vp); 997 int error = 0; 998 struct nfsvattr nfsva; 999 struct vattr *vap = ap->a_vap; 1000 struct vattr vattr; 1001 1002 /* 1003 * Update local times for special files. 1004 */ 1005 NFSLOCKNODE(np); 1006 if (np->n_flag & (NACC | NUPD)) 1007 np->n_flag |= NCHG; 1008 NFSUNLOCKNODE(np); 1009 /* 1010 * First look in the cache. 1011 */ 1012 if (ncl_getattrcache(vp, &vattr) == 0) { 1013 ncl_copy_vattr(vap, &vattr); 1014 1015 /* 1016 * Get the local modify time for the case of a write 1017 * delegation. 1018 */ 1019 nfscl_deleggetmodtime(vp, &vap->va_mtime); 1020 return (0); 1021 } 1022 1023 if (NFS_ISV34(vp) && nfs_prime_access_cache && 1024 nfsaccess_cache_timeout > 0) { 1025 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 1026 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL); 1027 if (ncl_getattrcache(vp, ap->a_vap) == 0) { 1028 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime); 1029 return (0); 1030 } 1031 } 1032 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL); 1033 if (!error) 1034 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0); 1035 if (!error) { 1036 /* 1037 * Get the local modify time for the case of a write 1038 * delegation. 1039 */ 1040 nfscl_deleggetmodtime(vp, &vap->va_mtime); 1041 } else if (NFS_ISV4(vp)) { 1042 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1043 } 1044 return (error); 1045 } 1046 1047 /* 1048 * nfs setattr call. 1049 */ 1050 static int 1051 nfs_setattr(struct vop_setattr_args *ap) 1052 { 1053 struct vnode *vp = ap->a_vp; 1054 struct nfsnode *np = VTONFS(vp); 1055 struct thread *td = curthread; /* XXX */ 1056 struct vattr *vap = ap->a_vap; 1057 int error = 0; 1058 u_quad_t tsize; 1059 struct timespec ts; 1060 1061 #ifndef nolint 1062 tsize = (u_quad_t)0; 1063 #endif 1064 1065 /* 1066 * Setting of flags and marking of atimes are not supported. 1067 */ 1068 if (vap->va_flags != VNOVAL) 1069 return (EOPNOTSUPP); 1070 1071 /* 1072 * Disallow write attempts if the filesystem is mounted read-only. 1073 */ 1074 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 1075 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 1076 vap->va_mtime.tv_sec != VNOVAL || 1077 vap->va_birthtime.tv_sec != VNOVAL || 1078 vap->va_mode != (mode_t)VNOVAL) && 1079 (vp->v_mount->mnt_flag & MNT_RDONLY)) 1080 return (EROFS); 1081 if (vap->va_size != VNOVAL) { 1082 switch (vp->v_type) { 1083 case VDIR: 1084 return (EISDIR); 1085 case VCHR: 1086 case VBLK: 1087 case VSOCK: 1088 case VFIFO: 1089 if (vap->va_mtime.tv_sec == VNOVAL && 1090 vap->va_atime.tv_sec == VNOVAL && 1091 vap->va_birthtime.tv_sec == VNOVAL && 1092 vap->va_mode == (mode_t)VNOVAL && 1093 vap->va_uid == (uid_t)VNOVAL && 1094 vap->va_gid == (gid_t)VNOVAL) 1095 return (0); 1096 vap->va_size = VNOVAL; 1097 break; 1098 default: 1099 /* 1100 * Disallow write attempts if the filesystem is 1101 * mounted read-only. 1102 */ 1103 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1104 return (EROFS); 1105 /* 1106 * We run vnode_pager_setsize() early (why?), 1107 * we must set np->n_size now to avoid vinvalbuf 1108 * V_SAVE races that might setsize a lower 1109 * value. 1110 */ 1111 NFSLOCKNODE(np); 1112 tsize = np->n_size; 1113 NFSUNLOCKNODE(np); 1114 error = ncl_meta_setsize(vp, td, vap->va_size); 1115 NFSLOCKNODE(np); 1116 if (np->n_flag & NMODIFIED) { 1117 tsize = np->n_size; 1118 NFSUNLOCKNODE(np); 1119 error = ncl_vinvalbuf(vp, vap->va_size == 0 ? 1120 0 : V_SAVE, td, 1); 1121 if (error != 0) { 1122 vnode_pager_setsize(vp, tsize); 1123 return (error); 1124 } 1125 /* 1126 * Call nfscl_delegmodtime() to set the modify time 1127 * locally, as required. 1128 */ 1129 nfscl_delegmodtime(vp); 1130 } else 1131 NFSUNLOCKNODE(np); 1132 /* 1133 * np->n_size has already been set to vap->va_size 1134 * in ncl_meta_setsize(). We must set it again since 1135 * nfs_loadattrcache() could be called through 1136 * ncl_meta_setsize() and could modify np->n_size. 1137 */ 1138 NFSLOCKNODE(np); 1139 np->n_vattr.na_size = np->n_size = vap->va_size; 1140 NFSUNLOCKNODE(np); 1141 } 1142 } else { 1143 NFSLOCKNODE(np); 1144 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 1145 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 1146 NFSUNLOCKNODE(np); 1147 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 1148 if (error == EINTR || error == EIO) 1149 return (error); 1150 } else 1151 NFSUNLOCKNODE(np); 1152 } 1153 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 1154 if (vap->va_size != VNOVAL) { 1155 if (error == 0) { 1156 nanouptime(&ts); 1157 NFSLOCKNODE(np); 1158 np->n_localmodtime = ts; 1159 NFSUNLOCKNODE(np); 1160 } else { 1161 NFSLOCKNODE(np); 1162 np->n_size = np->n_vattr.na_size = tsize; 1163 vnode_pager_setsize(vp, tsize); 1164 NFSUNLOCKNODE(np); 1165 } 1166 } 1167 return (error); 1168 } 1169 1170 /* 1171 * Do an nfs setattr rpc. 1172 */ 1173 static int 1174 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 1175 struct thread *td) 1176 { 1177 struct nfsnode *np = VTONFS(vp); 1178 int error, ret, attrflag, i; 1179 struct nfsvattr nfsva; 1180 1181 if (NFS_ISV34(vp)) { 1182 NFSLOCKNODE(np); 1183 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) 1184 np->n_accesscache[i].stamp = 0; 1185 np->n_flag |= NDELEGMOD; 1186 NFSUNLOCKNODE(np); 1187 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); 1188 } 1189 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag, 1190 NULL); 1191 if (attrflag) { 1192 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1193 if (ret && !error) 1194 error = ret; 1195 } 1196 if (error && NFS_ISV4(vp)) 1197 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid); 1198 return (error); 1199 } 1200 1201 /* 1202 * nfs lookup call, one step at a time... 1203 * First look in cache 1204 * If not found, unlock the directory nfsnode and do the rpc 1205 */ 1206 static int 1207 nfs_lookup(struct vop_lookup_args *ap) 1208 { 1209 struct componentname *cnp = ap->a_cnp; 1210 struct vnode *dvp = ap->a_dvp; 1211 struct vnode **vpp = ap->a_vpp; 1212 struct mount *mp = dvp->v_mount; 1213 int flags = cnp->cn_flags; 1214 struct vnode *newvp; 1215 struct nfsmount *nmp; 1216 struct nfsnode *np, *newnp; 1217 int error = 0, attrflag, dattrflag, ltype, ncticks; 1218 struct thread *td = curthread; 1219 struct nfsfh *nfhp; 1220 struct nfsvattr dnfsva, nfsva; 1221 struct vattr vattr; 1222 struct timespec nctime, ts; 1223 uint32_t openmode; 1224 1225 *vpp = NULLVP; 1226 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) && 1227 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 1228 return (EROFS); 1229 if (dvp->v_type != VDIR) 1230 return (ENOTDIR); 1231 nmp = VFSTONFS(mp); 1232 np = VTONFS(dvp); 1233 1234 /* For NFSv4, wait until any remove is done. */ 1235 NFSLOCKNODE(np); 1236 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) { 1237 np->n_flag |= NREMOVEWANT; 1238 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0); 1239 } 1240 NFSUNLOCKNODE(np); 1241 1242 error = vn_dir_check_exec(dvp, cnp); 1243 if (error != 0) 1244 return (error); 1245 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks); 1246 if (error > 0 && error != ENOENT) 1247 return (error); 1248 if (error == -1) { 1249 /* 1250 * Lookups of "." are special and always return the 1251 * current directory. cache_lookup() already handles 1252 * associated locking bookkeeping, etc. 1253 */ 1254 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 1255 /* XXX: Is this really correct? */ 1256 if (cnp->cn_nameiop != LOOKUP && 1257 (flags & ISLASTCN)) 1258 cnp->cn_flags |= SAVENAME; 1259 return (0); 1260 } 1261 1262 /* 1263 * We only accept a positive hit in the cache if the 1264 * change time of the file matches our cached copy. 1265 * Otherwise, we discard the cache entry and fallback 1266 * to doing a lookup RPC. We also only trust cache 1267 * entries for less than nm_nametimeo seconds. 1268 * 1269 * To better handle stale file handles and attributes, 1270 * clear the attribute cache of this node if it is a 1271 * leaf component, part of an open() call, and not 1272 * locally modified before fetching the attributes. 1273 * This should allow stale file handles to be detected 1274 * here where we can fall back to a LOOKUP RPC to 1275 * recover rather than having nfs_open() detect the 1276 * stale file handle and failing open(2) with ESTALE. 1277 */ 1278 newvp = *vpp; 1279 newnp = VTONFS(newvp); 1280 if (!(nmp->nm_flag & NFSMNT_NOCTO) && 1281 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1282 !(newnp->n_flag & NMODIFIED)) { 1283 NFSLOCKNODE(newnp); 1284 newnp->n_attrstamp = 0; 1285 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1286 NFSUNLOCKNODE(newnp); 1287 } 1288 if (nfscl_nodeleg(newvp, 0) == 0 || 1289 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) && 1290 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 && 1291 timespeccmp(&vattr.va_ctime, &nctime, ==))) { 1292 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1293 if (cnp->cn_nameiop != LOOKUP && 1294 (flags & ISLASTCN)) 1295 cnp->cn_flags |= SAVENAME; 1296 return (0); 1297 } 1298 cache_purge(newvp); 1299 if (dvp != newvp) 1300 vput(newvp); 1301 else 1302 vrele(newvp); 1303 *vpp = NULLVP; 1304 } else if (error == ENOENT) { 1305 if (VN_IS_DOOMED(dvp)) 1306 return (ENOENT); 1307 /* 1308 * We only accept a negative hit in the cache if the 1309 * modification time of the parent directory matches 1310 * the cached copy in the name cache entry. 1311 * Otherwise, we discard all of the negative cache 1312 * entries for this directory. We also only trust 1313 * negative cache entries for up to nm_negnametimeo 1314 * seconds. 1315 */ 1316 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) && 1317 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && 1318 timespeccmp(&vattr.va_mtime, &nctime, ==)) { 1319 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1320 return (ENOENT); 1321 } 1322 cache_purge_negative(dvp); 1323 } 1324 1325 /* 1326 * If this an NFSv4.1/4.2 mount using the "oneopenown" mount 1327 * option, it is possible to do the Open operation in the same 1328 * compound as Lookup, so long as delegations are not being 1329 * issued. This saves doing a separate RPC for Open. 1330 */ 1331 openmode = 0; 1332 NFSLOCKMNT(nmp); 1333 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp) && 1334 (nmp->nm_privflag & NFSMNTP_DELEGISSUED) == 0 && 1335 (!NFSMNT_RDONLY(mp) || (flags & OPENWRITE) == 0) && 1336 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN)) { 1337 if ((flags & OPENREAD) != 0) 1338 openmode |= NFSV4OPEN_ACCESSREAD; 1339 if ((flags & OPENWRITE) != 0) 1340 openmode |= NFSV4OPEN_ACCESSWRITE; 1341 } 1342 NFSUNLOCKMNT(nmp); 1343 1344 newvp = NULLVP; 1345 NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses); 1346 nanouptime(&ts); 1347 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1348 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1349 NULL, openmode); 1350 if (dattrflag) 1351 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1352 if (error) { 1353 if (newvp != NULLVP) { 1354 vput(newvp); 1355 *vpp = NULLVP; 1356 } 1357 1358 if (error != ENOENT) { 1359 if (NFS_ISV4(dvp)) 1360 error = nfscl_maperr(td, error, (uid_t)0, 1361 (gid_t)0); 1362 return (error); 1363 } 1364 1365 /* The requested file was not found. */ 1366 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1367 (flags & ISLASTCN)) { 1368 /* 1369 * XXX: UFS does a full VOP_ACCESS(dvp, 1370 * VWRITE) here instead of just checking 1371 * MNT_RDONLY. 1372 */ 1373 if (mp->mnt_flag & MNT_RDONLY) 1374 return (EROFS); 1375 cnp->cn_flags |= SAVENAME; 1376 return (EJUSTRETURN); 1377 } 1378 1379 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) { 1380 /* 1381 * Cache the modification time of the parent 1382 * directory from the post-op attributes in 1383 * the name cache entry. The negative cache 1384 * entry will be ignored once the directory 1385 * has changed. Don't bother adding the entry 1386 * if the directory has already changed. 1387 */ 1388 NFSLOCKNODE(np); 1389 if (timespeccmp(&np->n_vattr.na_mtime, 1390 &dnfsva.na_mtime, ==)) { 1391 NFSUNLOCKNODE(np); 1392 cache_enter_time(dvp, NULL, cnp, 1393 &dnfsva.na_mtime, NULL); 1394 } else 1395 NFSUNLOCKNODE(np); 1396 } 1397 return (ENOENT); 1398 } 1399 1400 /* 1401 * Handle RENAME case... 1402 */ 1403 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 1404 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1405 free(nfhp, M_NFSFH); 1406 return (EISDIR); 1407 } 1408 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1409 LK_EXCLUSIVE); 1410 if (error) 1411 return (error); 1412 newvp = NFSTOV(np); 1413 /* 1414 * If n_localmodtime >= time before RPC, then 1415 * a file modification operation, such as 1416 * VOP_SETATTR() of size, has occurred while 1417 * the Lookup RPC and acquisition of the vnode 1418 * happened. As such, the attributes might 1419 * be stale, with possibly an incorrect size. 1420 */ 1421 NFSLOCKNODE(np); 1422 if (timespecisset(&np->n_localmodtime) && 1423 timespeccmp(&np->n_localmodtime, &ts, >=)) { 1424 NFSCL_DEBUG(4, "nfs_lookup: rename localmod " 1425 "stale attributes\n"); 1426 attrflag = 0; 1427 } 1428 NFSUNLOCKNODE(np); 1429 if (attrflag) 1430 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1431 0, 1); 1432 *vpp = newvp; 1433 cnp->cn_flags |= SAVENAME; 1434 return (0); 1435 } 1436 1437 if (flags & ISDOTDOT) { 1438 ltype = NFSVOPISLOCKED(dvp); 1439 error = vfs_busy(mp, MBF_NOWAIT); 1440 if (error != 0) { 1441 vfs_ref(mp); 1442 NFSVOPUNLOCK(dvp); 1443 error = vfs_busy(mp, 0); 1444 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1445 vfs_rel(mp); 1446 if (error == 0 && VN_IS_DOOMED(dvp)) { 1447 vfs_unbusy(mp); 1448 error = ENOENT; 1449 } 1450 if (error != 0) 1451 return (error); 1452 } 1453 NFSVOPUNLOCK(dvp); 1454 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1455 cnp->cn_lkflags); 1456 if (error == 0) 1457 newvp = NFSTOV(np); 1458 vfs_unbusy(mp); 1459 if (newvp != dvp) 1460 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1461 if (VN_IS_DOOMED(dvp)) { 1462 if (error == 0) { 1463 if (newvp == dvp) 1464 vrele(newvp); 1465 else 1466 vput(newvp); 1467 } 1468 error = ENOENT; 1469 } 1470 if (error != 0) 1471 return (error); 1472 if (attrflag) 1473 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1474 0, 1); 1475 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1476 free(nfhp, M_NFSFH); 1477 VREF(dvp); 1478 newvp = dvp; 1479 if (attrflag) 1480 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1481 0, 1); 1482 } else { 1483 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1484 cnp->cn_lkflags); 1485 if (error) 1486 return (error); 1487 newvp = NFSTOV(np); 1488 /* 1489 * If n_localmodtime >= time before RPC, then 1490 * a file modification operation, such as 1491 * VOP_SETATTR() of size, has occurred while 1492 * the Lookup RPC and acquisition of the vnode 1493 * happened. As such, the attributes might 1494 * be stale, with possibly an incorrect size. 1495 */ 1496 NFSLOCKNODE(np); 1497 if (timespecisset(&np->n_localmodtime) && 1498 timespeccmp(&np->n_localmodtime, &ts, >=)) { 1499 NFSCL_DEBUG(4, "nfs_lookup: localmod " 1500 "stale attributes\n"); 1501 attrflag = 0; 1502 } 1503 NFSUNLOCKNODE(np); 1504 if (attrflag) 1505 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1506 0, 1); 1507 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1508 !(np->n_flag & NMODIFIED)) { 1509 /* 1510 * Flush the attribute cache when opening a 1511 * leaf node to ensure that fresh attributes 1512 * are fetched in nfs_open() since we did not 1513 * fetch attributes from the LOOKUP reply. 1514 */ 1515 NFSLOCKNODE(np); 1516 np->n_attrstamp = 0; 1517 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1518 NFSUNLOCKNODE(np); 1519 } 1520 } 1521 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1522 cnp->cn_flags |= SAVENAME; 1523 if ((cnp->cn_flags & MAKEENTRY) && dvp != newvp && 1524 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) && 1525 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0)) 1526 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 1527 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime); 1528 *vpp = newvp; 1529 return (0); 1530 } 1531 1532 /* 1533 * nfs read call. 1534 * Just call ncl_bioread() to do the work. 1535 */ 1536 static int 1537 nfs_read(struct vop_read_args *ap) 1538 { 1539 struct vnode *vp = ap->a_vp; 1540 1541 switch (vp->v_type) { 1542 case VREG: 1543 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1544 case VDIR: 1545 return (EISDIR); 1546 default: 1547 return (EOPNOTSUPP); 1548 } 1549 } 1550 1551 /* 1552 * nfs readlink call 1553 */ 1554 static int 1555 nfs_readlink(struct vop_readlink_args *ap) 1556 { 1557 struct vnode *vp = ap->a_vp; 1558 1559 if (vp->v_type != VLNK) 1560 return (EINVAL); 1561 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1562 } 1563 1564 /* 1565 * Do a readlink rpc. 1566 * Called by ncl_doio() from below the buffer cache. 1567 */ 1568 int 1569 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1570 { 1571 int error, ret, attrflag; 1572 struct nfsvattr nfsva; 1573 1574 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva, 1575 &attrflag, NULL); 1576 if (attrflag) { 1577 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1578 if (ret && !error) 1579 error = ret; 1580 } 1581 if (error && NFS_ISV4(vp)) 1582 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1583 return (error); 1584 } 1585 1586 /* 1587 * nfs read rpc call 1588 * Ditto above 1589 */ 1590 int 1591 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1592 { 1593 int error, ret, attrflag; 1594 struct nfsvattr nfsva; 1595 struct nfsmount *nmp; 1596 1597 nmp = VFSTONFS(vp->v_mount); 1598 error = EIO; 1599 attrflag = 0; 1600 if (NFSHASPNFS(nmp)) 1601 error = nfscl_doiods(vp, uiop, NULL, NULL, 1602 NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td); 1603 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error); 1604 if (error != 0) 1605 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, 1606 &attrflag, NULL); 1607 if (attrflag) { 1608 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1609 if (ret && !error) 1610 error = ret; 1611 } 1612 if (error && NFS_ISV4(vp)) 1613 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1614 return (error); 1615 } 1616 1617 /* 1618 * nfs write call 1619 */ 1620 int 1621 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1622 int *iomode, int *must_commit, int called_from_strategy) 1623 { 1624 struct nfsvattr nfsva; 1625 int error, attrflag, ret; 1626 struct nfsmount *nmp; 1627 1628 nmp = VFSTONFS(vp->v_mount); 1629 error = EIO; 1630 attrflag = 0; 1631 if (NFSHASPNFS(nmp)) 1632 error = nfscl_doiods(vp, uiop, iomode, must_commit, 1633 NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td); 1634 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error); 1635 if (error != 0) 1636 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred, 1637 uiop->uio_td, &nfsva, &attrflag, NULL, 1638 called_from_strategy); 1639 if (attrflag) { 1640 if (VTONFS(vp)->n_flag & ND_NFSV4) 1641 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1, 1642 1); 1643 else 1644 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1645 1); 1646 if (ret && !error) 1647 error = ret; 1648 } 1649 if (DOINGASYNC(vp)) 1650 *iomode = NFSWRITE_FILESYNC; 1651 if (error && NFS_ISV4(vp)) 1652 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1653 return (error); 1654 } 1655 1656 /* 1657 * nfs mknod rpc 1658 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1659 * mode set to specify the file type and the size field for rdev. 1660 */ 1661 static int 1662 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1663 struct vattr *vap) 1664 { 1665 struct nfsvattr nfsva, dnfsva; 1666 struct vnode *newvp = NULL; 1667 struct nfsnode *np = NULL, *dnp; 1668 struct nfsfh *nfhp; 1669 struct vattr vattr; 1670 int error = 0, attrflag, dattrflag; 1671 u_int32_t rdev; 1672 1673 if (vap->va_type == VCHR || vap->va_type == VBLK) 1674 rdev = vap->va_rdev; 1675 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1676 rdev = 0xffffffff; 1677 else 1678 return (EOPNOTSUPP); 1679 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1680 return (error); 1681 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap, 1682 rdev, vap->va_type, cnp->cn_cred, curthread, &dnfsva, 1683 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 1684 if (!error) { 1685 if (!nfhp) 1686 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1687 cnp->cn_namelen, cnp->cn_cred, curthread, 1688 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1689 NULL, 0); 1690 if (nfhp) 1691 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1692 curthread, &np, NULL, LK_EXCLUSIVE); 1693 } 1694 if (dattrflag) 1695 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1696 if (!error) { 1697 newvp = NFSTOV(np); 1698 if (attrflag != 0) { 1699 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1700 0, 1); 1701 if (error != 0) 1702 vput(newvp); 1703 } 1704 } 1705 if (!error) { 1706 *vpp = newvp; 1707 } else if (NFS_ISV4(dvp)) { 1708 error = nfscl_maperr(curthread, error, vap->va_uid, 1709 vap->va_gid); 1710 } 1711 dnp = VTONFS(dvp); 1712 NFSLOCKNODE(dnp); 1713 dnp->n_flag |= NMODIFIED; 1714 if (!dattrflag) { 1715 dnp->n_attrstamp = 0; 1716 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1717 } 1718 NFSUNLOCKNODE(dnp); 1719 return (error); 1720 } 1721 1722 /* 1723 * nfs mknod vop 1724 * just call nfs_mknodrpc() to do the work. 1725 */ 1726 /* ARGSUSED */ 1727 static int 1728 nfs_mknod(struct vop_mknod_args *ap) 1729 { 1730 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1731 } 1732 1733 static struct mtx nfs_cverf_mtx; 1734 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex", 1735 MTX_DEF); 1736 1737 static nfsquad_t 1738 nfs_get_cverf(void) 1739 { 1740 static nfsquad_t cverf; 1741 nfsquad_t ret; 1742 static int cverf_initialized = 0; 1743 1744 mtx_lock(&nfs_cverf_mtx); 1745 if (cverf_initialized == 0) { 1746 cverf.lval[0] = arc4random(); 1747 cverf.lval[1] = arc4random(); 1748 cverf_initialized = 1; 1749 } else 1750 cverf.qval++; 1751 ret = cverf; 1752 mtx_unlock(&nfs_cverf_mtx); 1753 1754 return (ret); 1755 } 1756 1757 /* 1758 * nfs file create call 1759 */ 1760 static int 1761 nfs_create(struct vop_create_args *ap) 1762 { 1763 struct vnode *dvp = ap->a_dvp; 1764 struct vattr *vap = ap->a_vap; 1765 struct componentname *cnp = ap->a_cnp; 1766 struct nfsnode *np = NULL, *dnp; 1767 struct vnode *newvp = NULL; 1768 struct nfsmount *nmp; 1769 struct nfsvattr dnfsva, nfsva; 1770 struct nfsfh *nfhp; 1771 nfsquad_t cverf; 1772 int error = 0, attrflag, dattrflag, fmode = 0; 1773 struct vattr vattr; 1774 1775 /* 1776 * Oops, not for me.. 1777 */ 1778 if (vap->va_type == VSOCK) 1779 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1780 1781 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1782 return (error); 1783 if (vap->va_vaflags & VA_EXCLUSIVE) 1784 fmode |= O_EXCL; 1785 dnp = VTONFS(dvp); 1786 nmp = VFSTONFS(dvp->v_mount); 1787 again: 1788 /* For NFSv4, wait until any remove is done. */ 1789 NFSLOCKNODE(dnp); 1790 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) { 1791 dnp->n_flag |= NREMOVEWANT; 1792 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0); 1793 } 1794 NFSUNLOCKNODE(dnp); 1795 1796 cverf = nfs_get_cverf(); 1797 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1798 vap, cverf, fmode, cnp->cn_cred, curthread, &dnfsva, &nfsva, 1799 &nfhp, &attrflag, &dattrflag, NULL); 1800 if (!error) { 1801 if (nfhp == NULL) 1802 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1803 cnp->cn_namelen, cnp->cn_cred, curthread, 1804 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1805 NULL, 0); 1806 if (nfhp != NULL) 1807 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1808 curthread, &np, NULL, LK_EXCLUSIVE); 1809 } 1810 if (dattrflag) 1811 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1812 if (!error) { 1813 newvp = NFSTOV(np); 1814 if (attrflag == 0) 1815 error = nfsrpc_getattr(newvp, cnp->cn_cred, 1816 curthread, &nfsva, NULL); 1817 if (error == 0) 1818 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1819 0, 1); 1820 } 1821 if (error) { 1822 if (newvp != NULL) { 1823 vput(newvp); 1824 newvp = NULL; 1825 } 1826 if (NFS_ISV34(dvp) && (fmode & O_EXCL) && 1827 error == NFSERR_NOTSUPP) { 1828 fmode &= ~O_EXCL; 1829 goto again; 1830 } 1831 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) { 1832 if (nfscl_checksattr(vap, &nfsva)) { 1833 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred, 1834 curthread, &nfsva, &attrflag, NULL); 1835 if (error && (vap->va_uid != (uid_t)VNOVAL || 1836 vap->va_gid != (gid_t)VNOVAL)) { 1837 /* try again without setting uid/gid */ 1838 vap->va_uid = (uid_t)VNOVAL; 1839 vap->va_gid = (uid_t)VNOVAL; 1840 error = nfsrpc_setattr(newvp, vap, NULL, 1841 cnp->cn_cred, curthread, &nfsva, 1842 &attrflag, NULL); 1843 } 1844 if (attrflag) 1845 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 1846 NULL, 0, 1); 1847 if (error != 0) 1848 vput(newvp); 1849 } 1850 } 1851 if (!error) { 1852 if ((cnp->cn_flags & MAKEENTRY) && attrflag) { 1853 if (dvp != newvp) 1854 cache_enter_time(dvp, newvp, cnp, 1855 &nfsva.na_ctime, NULL); 1856 else 1857 printf("nfs_create: bogus NFS server returned " 1858 "the directory as the new file object\n"); 1859 } 1860 *ap->a_vpp = newvp; 1861 } else if (NFS_ISV4(dvp)) { 1862 error = nfscl_maperr(curthread, error, vap->va_uid, 1863 vap->va_gid); 1864 } 1865 NFSLOCKNODE(dnp); 1866 dnp->n_flag |= NMODIFIED; 1867 if (!dattrflag) { 1868 dnp->n_attrstamp = 0; 1869 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1870 } 1871 NFSUNLOCKNODE(dnp); 1872 return (error); 1873 } 1874 1875 /* 1876 * nfs file remove call 1877 * To try and make nfs semantics closer to ufs semantics, a file that has 1878 * other processes using the vnode is renamed instead of removed and then 1879 * removed later on the last close. 1880 * - If v_usecount > 1 1881 * If a rename is not already in the works 1882 * call nfs_sillyrename() to set it up 1883 * else 1884 * do the remove rpc 1885 */ 1886 static int 1887 nfs_remove(struct vop_remove_args *ap) 1888 { 1889 struct vnode *vp = ap->a_vp; 1890 struct vnode *dvp = ap->a_dvp; 1891 struct componentname *cnp = ap->a_cnp; 1892 struct nfsnode *np = VTONFS(vp); 1893 int error = 0; 1894 struct vattr vattr; 1895 1896 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name")); 1897 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount")); 1898 if (vp->v_type == VDIR) 1899 error = EPERM; 1900 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1901 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1902 vattr.va_nlink > 1)) { 1903 /* 1904 * Purge the name cache so that the chance of a lookup for 1905 * the name succeeding while the remove is in progress is 1906 * minimized. Without node locking it can still happen, such 1907 * that an I/O op returns ESTALE, but since you get this if 1908 * another host removes the file.. 1909 */ 1910 cache_purge(vp); 1911 /* 1912 * throw away biocache buffers, mainly to avoid 1913 * unnecessary delayed writes later. 1914 */ 1915 error = ncl_vinvalbuf(vp, 0, curthread, 1); 1916 if (error != EINTR && error != EIO) 1917 /* Do the rpc */ 1918 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr, 1919 cnp->cn_namelen, cnp->cn_cred, curthread); 1920 /* 1921 * Kludge City: If the first reply to the remove rpc is lost.. 1922 * the reply to the retransmitted request will be ENOENT 1923 * since the file was in fact removed 1924 * Therefore, we cheat and return success. 1925 */ 1926 if (error == ENOENT) 1927 error = 0; 1928 } else if (!np->n_sillyrename) 1929 error = nfs_sillyrename(dvp, vp, cnp); 1930 NFSLOCKNODE(np); 1931 np->n_attrstamp = 0; 1932 NFSUNLOCKNODE(np); 1933 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1934 return (error); 1935 } 1936 1937 /* 1938 * nfs file remove rpc called from nfs_inactive 1939 */ 1940 int 1941 ncl_removeit(struct sillyrename *sp, struct vnode *vp) 1942 { 1943 /* 1944 * Make sure that the directory vnode is still valid. 1945 * XXX we should lock sp->s_dvp here. 1946 */ 1947 if (sp->s_dvp->v_type == VBAD) 1948 return (0); 1949 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen, 1950 sp->s_cred, NULL)); 1951 } 1952 1953 /* 1954 * Nfs remove rpc, called from nfs_remove() and ncl_removeit(). 1955 */ 1956 static int 1957 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 1958 int namelen, struct ucred *cred, struct thread *td) 1959 { 1960 struct nfsvattr dnfsva; 1961 struct nfsnode *dnp = VTONFS(dvp); 1962 int error = 0, dattrflag; 1963 1964 NFSLOCKNODE(dnp); 1965 dnp->n_flag |= NREMOVEINPROG; 1966 NFSUNLOCKNODE(dnp); 1967 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva, 1968 &dattrflag, NULL); 1969 NFSLOCKNODE(dnp); 1970 if ((dnp->n_flag & NREMOVEWANT)) { 1971 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG); 1972 NFSUNLOCKNODE(dnp); 1973 wakeup((caddr_t)dnp); 1974 } else { 1975 dnp->n_flag &= ~NREMOVEINPROG; 1976 NFSUNLOCKNODE(dnp); 1977 } 1978 if (dattrflag) 1979 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1980 NFSLOCKNODE(dnp); 1981 dnp->n_flag |= NMODIFIED; 1982 if (!dattrflag) { 1983 dnp->n_attrstamp = 0; 1984 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1985 } 1986 NFSUNLOCKNODE(dnp); 1987 if (error && NFS_ISV4(dvp)) 1988 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1989 return (error); 1990 } 1991 1992 /* 1993 * nfs file rename call 1994 */ 1995 static int 1996 nfs_rename(struct vop_rename_args *ap) 1997 { 1998 struct vnode *fvp = ap->a_fvp; 1999 struct vnode *tvp = ap->a_tvp; 2000 struct vnode *fdvp = ap->a_fdvp; 2001 struct vnode *tdvp = ap->a_tdvp; 2002 struct componentname *tcnp = ap->a_tcnp; 2003 struct componentname *fcnp = ap->a_fcnp; 2004 struct nfsnode *fnp = VTONFS(ap->a_fvp); 2005 struct nfsnode *tdnp = VTONFS(ap->a_tdvp); 2006 struct nfsv4node *newv4 = NULL; 2007 int error; 2008 2009 KASSERT((tcnp->cn_flags & HASBUF) != 0 && 2010 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name")); 2011 /* Check for cross-device rename */ 2012 if ((fvp->v_mount != tdvp->v_mount) || 2013 (tvp && (fvp->v_mount != tvp->v_mount))) { 2014 error = EXDEV; 2015 goto out; 2016 } 2017 2018 if (fvp == tvp) { 2019 printf("nfs_rename: fvp == tvp (can't happen)\n"); 2020 error = 0; 2021 goto out; 2022 } 2023 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0) 2024 goto out; 2025 2026 /* 2027 * We have to flush B_DELWRI data prior to renaming 2028 * the file. If we don't, the delayed-write buffers 2029 * can be flushed out later after the file has gone stale 2030 * under NFSV3. NFSV2 does not have this problem because 2031 * ( as far as I can tell ) it flushes dirty buffers more 2032 * often. 2033 * 2034 * Skip the rename operation if the fsync fails, this can happen 2035 * due to the server's volume being full, when we pushed out data 2036 * that was written back to our cache earlier. Not checking for 2037 * this condition can result in potential (silent) data loss. 2038 */ 2039 error = VOP_FSYNC(fvp, MNT_WAIT, curthread); 2040 NFSVOPUNLOCK(fvp); 2041 if (!error && tvp) 2042 error = VOP_FSYNC(tvp, MNT_WAIT, curthread); 2043 if (error) 2044 goto out; 2045 2046 /* 2047 * If the tvp exists and is in use, sillyrename it before doing the 2048 * rename of the new file over it. 2049 * XXX Can't sillyrename a directory. 2050 */ 2051 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 2052 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 2053 vput(tvp); 2054 tvp = NULL; 2055 } 2056 2057 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen, 2058 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 2059 curthread); 2060 2061 if (error == 0 && NFS_ISV4(tdvp)) { 2062 /* 2063 * For NFSv4, check to see if it is the same name and 2064 * replace the name, if it is different. 2065 */ 2066 newv4 = malloc( 2067 sizeof (struct nfsv4node) + 2068 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1, 2069 M_NFSV4NODE, M_WAITOK); 2070 NFSLOCKNODE(tdnp); 2071 NFSLOCKNODE(fnp); 2072 if (fnp->n_v4 != NULL && fvp->v_type == VREG && 2073 (fnp->n_v4->n4_namelen != tcnp->cn_namelen || 2074 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4), 2075 tcnp->cn_namelen) || 2076 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen || 2077 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 2078 tdnp->n_fhp->nfh_len))) { 2079 #ifdef notdef 2080 { char nnn[100]; int nnnl; 2081 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99; 2082 bcopy(tcnp->cn_nameptr, nnn, nnnl); 2083 nnn[nnnl] = '\0'; 2084 printf("ren replace=%s\n",nnn); 2085 } 2086 #endif 2087 free(fnp->n_v4, M_NFSV4NODE); 2088 fnp->n_v4 = newv4; 2089 newv4 = NULL; 2090 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len; 2091 fnp->n_v4->n4_namelen = tcnp->cn_namelen; 2092 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 2093 tdnp->n_fhp->nfh_len); 2094 NFSBCOPY(tcnp->cn_nameptr, 2095 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen); 2096 } 2097 NFSUNLOCKNODE(tdnp); 2098 NFSUNLOCKNODE(fnp); 2099 if (newv4 != NULL) 2100 free(newv4, M_NFSV4NODE); 2101 } 2102 2103 if (fvp->v_type == VDIR) { 2104 if (tvp != NULL && tvp->v_type == VDIR) 2105 cache_purge(tdvp); 2106 cache_purge(fdvp); 2107 } 2108 2109 out: 2110 if (tdvp == tvp) 2111 vrele(tdvp); 2112 else 2113 vput(tdvp); 2114 if (tvp) 2115 vput(tvp); 2116 vrele(fdvp); 2117 vrele(fvp); 2118 /* 2119 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 2120 */ 2121 if (error == ENOENT) 2122 error = 0; 2123 return (error); 2124 } 2125 2126 /* 2127 * nfs file rename rpc called from nfs_remove() above 2128 */ 2129 static int 2130 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp, 2131 struct sillyrename *sp) 2132 { 2133 2134 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen, 2135 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred, 2136 curthread)); 2137 } 2138 2139 /* 2140 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 2141 */ 2142 static int 2143 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr, 2144 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr, 2145 int tnamelen, struct ucred *cred, struct thread *td) 2146 { 2147 struct nfsvattr fnfsva, tnfsva; 2148 struct nfsnode *fdnp = VTONFS(fdvp); 2149 struct nfsnode *tdnp = VTONFS(tdvp); 2150 int error = 0, fattrflag, tattrflag; 2151 2152 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp, 2153 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag, 2154 &tattrflag, NULL, NULL); 2155 NFSLOCKNODE(fdnp); 2156 fdnp->n_flag |= NMODIFIED; 2157 if (fattrflag != 0) { 2158 NFSUNLOCKNODE(fdnp); 2159 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1); 2160 } else { 2161 fdnp->n_attrstamp = 0; 2162 NFSUNLOCKNODE(fdnp); 2163 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 2164 } 2165 NFSLOCKNODE(tdnp); 2166 tdnp->n_flag |= NMODIFIED; 2167 if (tattrflag != 0) { 2168 NFSUNLOCKNODE(tdnp); 2169 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1); 2170 } else { 2171 tdnp->n_attrstamp = 0; 2172 NFSUNLOCKNODE(tdnp); 2173 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2174 } 2175 if (error && NFS_ISV4(fdvp)) 2176 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2177 return (error); 2178 } 2179 2180 /* 2181 * nfs hard link create call 2182 */ 2183 static int 2184 nfs_link(struct vop_link_args *ap) 2185 { 2186 struct vnode *vp = ap->a_vp; 2187 struct vnode *tdvp = ap->a_tdvp; 2188 struct componentname *cnp = ap->a_cnp; 2189 struct nfsnode *np, *tdnp; 2190 struct nfsvattr nfsva, dnfsva; 2191 int error = 0, attrflag, dattrflag; 2192 2193 /* 2194 * Push all writes to the server, so that the attribute cache 2195 * doesn't get "out of sync" with the server. 2196 * XXX There should be a better way! 2197 */ 2198 VOP_FSYNC(vp, MNT_WAIT, curthread); 2199 2200 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 2201 cnp->cn_cred, curthread, &dnfsva, &nfsva, &attrflag, 2202 &dattrflag, NULL); 2203 tdnp = VTONFS(tdvp); 2204 NFSLOCKNODE(tdnp); 2205 tdnp->n_flag |= NMODIFIED; 2206 if (dattrflag != 0) { 2207 NFSUNLOCKNODE(tdnp); 2208 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1); 2209 } else { 2210 tdnp->n_attrstamp = 0; 2211 NFSUNLOCKNODE(tdnp); 2212 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2213 } 2214 if (attrflag) 2215 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2216 else { 2217 np = VTONFS(vp); 2218 NFSLOCKNODE(np); 2219 np->n_attrstamp = 0; 2220 NFSUNLOCKNODE(np); 2221 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 2222 } 2223 /* 2224 * If negative lookup caching is enabled, I might as well 2225 * add an entry for this node. Not necessary for correctness, 2226 * but if negative caching is enabled, then the system 2227 * must care about lookup caching hit rate, so... 2228 */ 2229 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 && 2230 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2231 if (tdvp != vp) 2232 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL); 2233 else 2234 printf("nfs_link: bogus NFS server returned " 2235 "the directory as the new link\n"); 2236 } 2237 if (error && NFS_ISV4(vp)) 2238 error = nfscl_maperr(curthread, error, (uid_t)0, 2239 (gid_t)0); 2240 return (error); 2241 } 2242 2243 /* 2244 * nfs symbolic link create call 2245 */ 2246 static int 2247 nfs_symlink(struct vop_symlink_args *ap) 2248 { 2249 struct vnode *dvp = ap->a_dvp; 2250 struct vattr *vap = ap->a_vap; 2251 struct componentname *cnp = ap->a_cnp; 2252 struct nfsvattr nfsva, dnfsva; 2253 struct nfsfh *nfhp; 2254 struct nfsnode *np = NULL, *dnp; 2255 struct vnode *newvp = NULL; 2256 int error = 0, attrflag, dattrflag, ret; 2257 2258 vap->va_type = VLNK; 2259 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2260 ap->a_target, vap, cnp->cn_cred, curthread, &dnfsva, 2261 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 2262 if (nfhp) { 2263 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread, 2264 &np, NULL, LK_EXCLUSIVE); 2265 if (!ret) 2266 newvp = NFSTOV(np); 2267 else if (!error) 2268 error = ret; 2269 } 2270 if (newvp != NULL) { 2271 if (attrflag) 2272 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2273 0, 1); 2274 } else if (!error) { 2275 /* 2276 * If we do not have an error and we could not extract the 2277 * newvp from the response due to the request being NFSv2, we 2278 * have to do a lookup in order to obtain a newvp to return. 2279 */ 2280 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2281 cnp->cn_cred, curthread, &np); 2282 if (!error) 2283 newvp = NFSTOV(np); 2284 } 2285 if (error) { 2286 if (newvp) 2287 vput(newvp); 2288 if (NFS_ISV4(dvp)) 2289 error = nfscl_maperr(curthread, error, 2290 vap->va_uid, vap->va_gid); 2291 } else { 2292 *ap->a_vpp = newvp; 2293 } 2294 2295 dnp = VTONFS(dvp); 2296 NFSLOCKNODE(dnp); 2297 dnp->n_flag |= NMODIFIED; 2298 if (dattrflag != 0) { 2299 NFSUNLOCKNODE(dnp); 2300 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2301 } else { 2302 dnp->n_attrstamp = 0; 2303 NFSUNLOCKNODE(dnp); 2304 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2305 } 2306 /* 2307 * If negative lookup caching is enabled, I might as well 2308 * add an entry for this node. Not necessary for correctness, 2309 * but if negative caching is enabled, then the system 2310 * must care about lookup caching hit rate, so... 2311 */ 2312 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2313 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2314 if (dvp != newvp) 2315 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 2316 NULL); 2317 else 2318 printf("nfs_symlink: bogus NFS server returned " 2319 "the directory as the new file object\n"); 2320 } 2321 return (error); 2322 } 2323 2324 /* 2325 * nfs make dir call 2326 */ 2327 static int 2328 nfs_mkdir(struct vop_mkdir_args *ap) 2329 { 2330 struct vnode *dvp = ap->a_dvp; 2331 struct vattr *vap = ap->a_vap; 2332 struct componentname *cnp = ap->a_cnp; 2333 struct nfsnode *np = NULL, *dnp; 2334 struct vnode *newvp = NULL; 2335 struct vattr vattr; 2336 struct nfsfh *nfhp; 2337 struct nfsvattr nfsva, dnfsva; 2338 int error = 0, attrflag, dattrflag, ret; 2339 2340 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2341 return (error); 2342 vap->va_type = VDIR; 2343 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2344 vap, cnp->cn_cred, curthread, &dnfsva, &nfsva, &nfhp, 2345 &attrflag, &dattrflag, NULL); 2346 dnp = VTONFS(dvp); 2347 NFSLOCKNODE(dnp); 2348 dnp->n_flag |= NMODIFIED; 2349 if (dattrflag != 0) { 2350 NFSUNLOCKNODE(dnp); 2351 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2352 } else { 2353 dnp->n_attrstamp = 0; 2354 NFSUNLOCKNODE(dnp); 2355 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2356 } 2357 if (nfhp) { 2358 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread, 2359 &np, NULL, LK_EXCLUSIVE); 2360 if (!ret) { 2361 newvp = NFSTOV(np); 2362 if (attrflag) 2363 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 2364 NULL, 0, 1); 2365 } else if (!error) 2366 error = ret; 2367 } 2368 if (!error && newvp == NULL) { 2369 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2370 cnp->cn_cred, curthread, &np); 2371 if (!error) { 2372 newvp = NFSTOV(np); 2373 if (newvp->v_type != VDIR) 2374 error = EEXIST; 2375 } 2376 } 2377 if (error) { 2378 if (newvp) 2379 vput(newvp); 2380 if (NFS_ISV4(dvp)) 2381 error = nfscl_maperr(curthread, error, 2382 vap->va_uid, vap->va_gid); 2383 } else { 2384 /* 2385 * If negative lookup caching is enabled, I might as well 2386 * add an entry for this node. Not necessary for correctness, 2387 * but if negative caching is enabled, then the system 2388 * must care about lookup caching hit rate, so... 2389 */ 2390 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2391 (cnp->cn_flags & MAKEENTRY) && 2392 attrflag != 0 && dattrflag != 0) { 2393 if (dvp != newvp) 2394 cache_enter_time(dvp, newvp, cnp, 2395 &nfsva.na_ctime, &dnfsva.na_ctime); 2396 else 2397 printf("nfs_mkdir: bogus NFS server returned " 2398 "the directory that the directory was " 2399 "created in as the new file object\n"); 2400 } 2401 *ap->a_vpp = newvp; 2402 } 2403 return (error); 2404 } 2405 2406 /* 2407 * nfs remove directory call 2408 */ 2409 static int 2410 nfs_rmdir(struct vop_rmdir_args *ap) 2411 { 2412 struct vnode *vp = ap->a_vp; 2413 struct vnode *dvp = ap->a_dvp; 2414 struct componentname *cnp = ap->a_cnp; 2415 struct nfsnode *dnp; 2416 struct nfsvattr dnfsva; 2417 int error, dattrflag; 2418 2419 if (dvp == vp) 2420 return (EINVAL); 2421 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2422 cnp->cn_cred, curthread, &dnfsva, &dattrflag, NULL); 2423 dnp = VTONFS(dvp); 2424 NFSLOCKNODE(dnp); 2425 dnp->n_flag |= NMODIFIED; 2426 if (dattrflag != 0) { 2427 NFSUNLOCKNODE(dnp); 2428 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2429 } else { 2430 dnp->n_attrstamp = 0; 2431 NFSUNLOCKNODE(dnp); 2432 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2433 } 2434 2435 cache_purge(dvp); 2436 cache_purge(vp); 2437 if (error && NFS_ISV4(dvp)) 2438 error = nfscl_maperr(curthread, error, (uid_t)0, 2439 (gid_t)0); 2440 /* 2441 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2442 */ 2443 if (error == ENOENT) 2444 error = 0; 2445 return (error); 2446 } 2447 2448 /* 2449 * nfs readdir call 2450 */ 2451 static int 2452 nfs_readdir(struct vop_readdir_args *ap) 2453 { 2454 struct vnode *vp = ap->a_vp; 2455 struct nfsnode *np = VTONFS(vp); 2456 struct uio *uio = ap->a_uio; 2457 ssize_t tresid, left; 2458 int error = 0; 2459 struct vattr vattr; 2460 2461 if (ap->a_eofflag != NULL) 2462 *ap->a_eofflag = 0; 2463 if (vp->v_type != VDIR) 2464 return(EPERM); 2465 2466 /* 2467 * First, check for hit on the EOF offset cache 2468 */ 2469 NFSLOCKNODE(np); 2470 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2471 (np->n_flag & NMODIFIED) == 0) { 2472 NFSUNLOCKNODE(np); 2473 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2474 NFSLOCKNODE(np); 2475 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) || 2476 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2477 NFSUNLOCKNODE(np); 2478 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits); 2479 if (ap->a_eofflag != NULL) 2480 *ap->a_eofflag = 1; 2481 return (0); 2482 } else 2483 NFSUNLOCKNODE(np); 2484 } 2485 } else 2486 NFSUNLOCKNODE(np); 2487 2488 /* 2489 * NFS always guarantees that directory entries don't straddle 2490 * DIRBLKSIZ boundaries. As such, we need to limit the size 2491 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial 2492 * directory entry. 2493 */ 2494 left = uio->uio_resid % DIRBLKSIZ; 2495 if (left == uio->uio_resid) 2496 return (EINVAL); 2497 uio->uio_resid -= left; 2498 2499 /* 2500 * Call ncl_bioread() to do the real work. 2501 */ 2502 tresid = uio->uio_resid; 2503 error = ncl_bioread(vp, uio, 0, ap->a_cred); 2504 2505 if (!error && uio->uio_resid == tresid) { 2506 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses); 2507 if (ap->a_eofflag != NULL) 2508 *ap->a_eofflag = 1; 2509 } 2510 2511 /* Add the partial DIRBLKSIZ (left) back in. */ 2512 uio->uio_resid += left; 2513 return (error); 2514 } 2515 2516 /* 2517 * Readdir rpc call. 2518 * Called from below the buffer cache by ncl_doio(). 2519 */ 2520 int 2521 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2522 struct thread *td) 2523 { 2524 struct nfsvattr nfsva; 2525 nfsuint64 *cookiep, cookie; 2526 struct nfsnode *dnp = VTONFS(vp); 2527 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2528 int error = 0, eof, attrflag; 2529 2530 KASSERT(uiop->uio_iovcnt == 1 && 2531 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2532 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2533 ("nfs readdirrpc bad uio")); 2534 2535 /* 2536 * If there is no cookie, assume directory was stale. 2537 */ 2538 ncl_dircookie_lock(dnp); 2539 NFSUNLOCKNODE(dnp); 2540 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2541 if (cookiep) { 2542 cookie = *cookiep; 2543 ncl_dircookie_unlock(dnp); 2544 } else { 2545 ncl_dircookie_unlock(dnp); 2546 return (NFSERR_BAD_COOKIE); 2547 } 2548 2549 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2550 (void)ncl_fsinfo(nmp, vp, cred, td); 2551 2552 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva, 2553 &attrflag, &eof, NULL); 2554 if (attrflag) 2555 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2556 2557 if (!error) { 2558 /* 2559 * We are now either at the end of the directory or have filled 2560 * the block. 2561 */ 2562 if (eof) { 2563 NFSLOCKNODE(dnp); 2564 dnp->n_direofoffset = uiop->uio_offset; 2565 NFSUNLOCKNODE(dnp); 2566 } else { 2567 if (uiop->uio_resid > 0) 2568 printf("EEK! readdirrpc resid > 0\n"); 2569 ncl_dircookie_lock(dnp); 2570 NFSUNLOCKNODE(dnp); 2571 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2572 *cookiep = cookie; 2573 ncl_dircookie_unlock(dnp); 2574 } 2575 } else if (NFS_ISV4(vp)) { 2576 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2577 } 2578 return (error); 2579 } 2580 2581 /* 2582 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc(). 2583 */ 2584 int 2585 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2586 struct thread *td) 2587 { 2588 struct nfsvattr nfsva; 2589 nfsuint64 *cookiep, cookie; 2590 struct nfsnode *dnp = VTONFS(vp); 2591 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2592 int error = 0, attrflag, eof; 2593 2594 KASSERT(uiop->uio_iovcnt == 1 && 2595 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2596 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2597 ("nfs readdirplusrpc bad uio")); 2598 2599 /* 2600 * If there is no cookie, assume directory was stale. 2601 */ 2602 ncl_dircookie_lock(dnp); 2603 NFSUNLOCKNODE(dnp); 2604 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2605 if (cookiep) { 2606 cookie = *cookiep; 2607 ncl_dircookie_unlock(dnp); 2608 } else { 2609 ncl_dircookie_unlock(dnp); 2610 return (NFSERR_BAD_COOKIE); 2611 } 2612 2613 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2614 (void)ncl_fsinfo(nmp, vp, cred, td); 2615 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva, 2616 &attrflag, &eof, NULL); 2617 if (attrflag) 2618 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2619 2620 if (!error) { 2621 /* 2622 * We are now either at end of the directory or have filled the 2623 * the block. 2624 */ 2625 if (eof) { 2626 NFSLOCKNODE(dnp); 2627 dnp->n_direofoffset = uiop->uio_offset; 2628 NFSUNLOCKNODE(dnp); 2629 } else { 2630 if (uiop->uio_resid > 0) 2631 printf("EEK! readdirplusrpc resid > 0\n"); 2632 ncl_dircookie_lock(dnp); 2633 NFSUNLOCKNODE(dnp); 2634 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2635 *cookiep = cookie; 2636 ncl_dircookie_unlock(dnp); 2637 } 2638 } else if (NFS_ISV4(vp)) { 2639 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2640 } 2641 return (error); 2642 } 2643 2644 /* 2645 * Silly rename. To make the NFS filesystem that is stateless look a little 2646 * more like the "ufs" a remove of an active vnode is translated to a rename 2647 * to a funny looking filename that is removed by nfs_inactive on the 2648 * nfsnode. There is the potential for another process on a different client 2649 * to create the same funny name between the nfs_lookitup() fails and the 2650 * nfs_rename() completes, but... 2651 */ 2652 static int 2653 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2654 { 2655 struct sillyrename *sp; 2656 struct nfsnode *np; 2657 int error; 2658 short pid; 2659 unsigned int lticks; 2660 2661 cache_purge(dvp); 2662 np = VTONFS(vp); 2663 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir")); 2664 sp = malloc(sizeof (struct sillyrename), 2665 M_NEWNFSREQ, M_WAITOK); 2666 sp->s_cred = crhold(cnp->cn_cred); 2667 sp->s_dvp = dvp; 2668 VREF(dvp); 2669 2670 /* 2671 * Fudge together a funny name. 2672 * Changing the format of the funny name to accommodate more 2673 * sillynames per directory. 2674 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2675 * CPU ticks since boot. 2676 */ 2677 pid = curthread->td_proc->p_pid; 2678 lticks = (unsigned int)ticks; 2679 for ( ; ; ) { 2680 sp->s_namlen = sprintf(sp->s_name, 2681 ".nfs.%08x.%04x4.4", lticks, 2682 pid); 2683 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2684 curthread, NULL)) 2685 break; 2686 lticks++; 2687 } 2688 error = nfs_renameit(dvp, vp, cnp, sp); 2689 if (error) 2690 goto bad; 2691 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2692 curthread, &np); 2693 np->n_sillyrename = sp; 2694 return (0); 2695 bad: 2696 vrele(sp->s_dvp); 2697 crfree(sp->s_cred); 2698 free(sp, M_NEWNFSREQ); 2699 return (error); 2700 } 2701 2702 /* 2703 * Look up a file name and optionally either update the file handle or 2704 * allocate an nfsnode, depending on the value of npp. 2705 * npp == NULL --> just do the lookup 2706 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2707 * handled too 2708 * *npp != NULL --> update the file handle in the vnode 2709 */ 2710 static int 2711 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred, 2712 struct thread *td, struct nfsnode **npp) 2713 { 2714 struct vnode *newvp = NULL, *vp; 2715 struct nfsnode *np, *dnp = VTONFS(dvp); 2716 struct nfsfh *nfhp, *onfhp; 2717 struct nfsvattr nfsva, dnfsva; 2718 struct componentname cn; 2719 int error = 0, attrflag, dattrflag; 2720 u_int hash; 2721 struct timespec ts; 2722 2723 nanouptime(&ts); 2724 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva, 2725 &nfhp, &attrflag, &dattrflag, NULL, 0); 2726 if (dattrflag) 2727 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2728 if (npp && !error) { 2729 if (*npp != NULL) { 2730 np = *npp; 2731 vp = NFSTOV(np); 2732 /* 2733 * For NFSv4, check to see if it is the same name and 2734 * replace the name, if it is different. 2735 */ 2736 if (np->n_v4 != NULL && nfsva.na_type == VREG && 2737 (np->n_v4->n4_namelen != len || 2738 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) || 2739 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen || 2740 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2741 dnp->n_fhp->nfh_len))) { 2742 #ifdef notdef 2743 { char nnn[100]; int nnnl; 2744 nnnl = (len < 100) ? len : 99; 2745 bcopy(name, nnn, nnnl); 2746 nnn[nnnl] = '\0'; 2747 printf("replace=%s\n",nnn); 2748 } 2749 #endif 2750 free(np->n_v4, M_NFSV4NODE); 2751 np->n_v4 = malloc( 2752 sizeof (struct nfsv4node) + 2753 dnp->n_fhp->nfh_len + len - 1, 2754 M_NFSV4NODE, M_WAITOK); 2755 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len; 2756 np->n_v4->n4_namelen = len; 2757 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2758 dnp->n_fhp->nfh_len); 2759 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len); 2760 } 2761 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, 2762 FNV1_32_INIT); 2763 onfhp = np->n_fhp; 2764 /* 2765 * Rehash node for new file handle. 2766 */ 2767 vfs_hash_rehash(vp, hash); 2768 np->n_fhp = nfhp; 2769 if (onfhp != NULL) 2770 free(onfhp, M_NFSFH); 2771 newvp = NFSTOV(np); 2772 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) { 2773 free(nfhp, M_NFSFH); 2774 VREF(dvp); 2775 newvp = dvp; 2776 } else { 2777 cn.cn_nameptr = name; 2778 cn.cn_namelen = len; 2779 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td, 2780 &np, NULL, LK_EXCLUSIVE); 2781 if (error) 2782 return (error); 2783 newvp = NFSTOV(np); 2784 /* 2785 * If n_localmodtime >= time before RPC, then 2786 * a file modification operation, such as 2787 * VOP_SETATTR() of size, has occurred while 2788 * the Lookup RPC and acquisition of the vnode 2789 * happened. As such, the attributes might 2790 * be stale, with possibly an incorrect size. 2791 */ 2792 NFSLOCKNODE(np); 2793 if (timespecisset(&np->n_localmodtime) && 2794 timespeccmp(&np->n_localmodtime, &ts, >=)) { 2795 NFSCL_DEBUG(4, "nfs_lookitup: localmod " 2796 "stale attributes\n"); 2797 attrflag = 0; 2798 } 2799 NFSUNLOCKNODE(np); 2800 } 2801 if (!attrflag && *npp == NULL) { 2802 if (newvp == dvp) 2803 vrele(newvp); 2804 else 2805 vput(newvp); 2806 return (ENOENT); 2807 } 2808 if (attrflag) 2809 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2810 0, 1); 2811 } 2812 if (npp && *npp == NULL) { 2813 if (error) { 2814 if (newvp) { 2815 if (newvp == dvp) 2816 vrele(newvp); 2817 else 2818 vput(newvp); 2819 } 2820 } else 2821 *npp = np; 2822 } 2823 if (error && NFS_ISV4(dvp)) 2824 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2825 return (error); 2826 } 2827 2828 /* 2829 * Nfs Version 3 and 4 commit rpc 2830 */ 2831 int 2832 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2833 struct thread *td) 2834 { 2835 struct nfsvattr nfsva; 2836 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2837 struct nfsnode *np; 2838 struct uio uio; 2839 int error, attrflag; 2840 2841 np = VTONFS(vp); 2842 error = EIO; 2843 attrflag = 0; 2844 if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) { 2845 uio.uio_offset = offset; 2846 uio.uio_resid = cnt; 2847 error = nfscl_doiods(vp, &uio, NULL, NULL, 2848 NFSV4OPEN_ACCESSWRITE, 1, cred, td); 2849 if (error != 0) { 2850 NFSLOCKNODE(np); 2851 np->n_flag &= ~NDSCOMMIT; 2852 NFSUNLOCKNODE(np); 2853 } 2854 } 2855 if (error != 0) { 2856 mtx_lock(&nmp->nm_mtx); 2857 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2858 mtx_unlock(&nmp->nm_mtx); 2859 return (0); 2860 } 2861 mtx_unlock(&nmp->nm_mtx); 2862 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva, 2863 &attrflag, NULL); 2864 } 2865 if (attrflag != 0) 2866 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 2867 0, 1); 2868 if (error != 0 && NFS_ISV4(vp)) 2869 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2870 return (error); 2871 } 2872 2873 /* 2874 * Strategy routine. 2875 * For async requests when nfsiod(s) are running, queue the request by 2876 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the 2877 * request. 2878 */ 2879 static int 2880 nfs_strategy(struct vop_strategy_args *ap) 2881 { 2882 struct buf *bp; 2883 struct vnode *vp; 2884 struct ucred *cr; 2885 2886 bp = ap->a_bp; 2887 vp = ap->a_vp; 2888 KASSERT(bp->b_vp == vp, ("missing b_getvp")); 2889 KASSERT(!(bp->b_flags & B_DONE), 2890 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2891 2892 if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno) 2893 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize / 2894 DEV_BSIZE); 2895 if (bp->b_iocmd == BIO_READ) 2896 cr = bp->b_rcred; 2897 else 2898 cr = bp->b_wcred; 2899 2900 /* 2901 * If the op is asynchronous and an i/o daemon is waiting 2902 * queue the request, wake it up and wait for completion 2903 * otherwise just do it ourselves. 2904 */ 2905 if ((bp->b_flags & B_ASYNC) == 0 || 2906 ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread)) 2907 (void) ncl_doio(vp, bp, cr, curthread, 1); 2908 return (0); 2909 } 2910 2911 /* 2912 * fsync vnode op. Just call ncl_flush() with commit == 1. 2913 */ 2914 /* ARGSUSED */ 2915 static int 2916 nfs_fsync(struct vop_fsync_args *ap) 2917 { 2918 2919 if (ap->a_vp->v_type != VREG) { 2920 /* 2921 * For NFS, metadata is changed synchronously on the server, 2922 * so there is nothing to flush. Also, ncl_flush() clears 2923 * the NMODIFIED flag and that shouldn't be done here for 2924 * directories. 2925 */ 2926 return (0); 2927 } 2928 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0)); 2929 } 2930 2931 /* 2932 * Flush all the blocks associated with a vnode. 2933 * Walk through the buffer pool and push any dirty pages 2934 * associated with the vnode. 2935 * If the called_from_renewthread argument is TRUE, it has been called 2936 * from the NFSv4 renew thread and, as such, cannot block indefinitely 2937 * waiting for a buffer write to complete. 2938 */ 2939 int 2940 ncl_flush(struct vnode *vp, int waitfor, struct thread *td, 2941 int commit, int called_from_renewthread) 2942 { 2943 struct nfsnode *np = VTONFS(vp); 2944 struct buf *bp; 2945 int i; 2946 struct buf *nbp; 2947 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2948 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2949 int passone = 1, trycnt = 0; 2950 u_quad_t off, endoff, toff; 2951 struct ucred* wcred = NULL; 2952 struct buf **bvec = NULL; 2953 struct bufobj *bo; 2954 #ifndef NFS_COMMITBVECSIZ 2955 #define NFS_COMMITBVECSIZ 20 2956 #endif 2957 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2958 u_int bvecsize = 0, bveccount; 2959 struct timespec ts; 2960 2961 if (called_from_renewthread != 0) 2962 slptimeo = hz; 2963 if (nmp->nm_flag & NFSMNT_INT) 2964 slpflag = PCATCH; 2965 if (!commit) 2966 passone = 0; 2967 bo = &vp->v_bufobj; 2968 /* 2969 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2970 * server, but has not been committed to stable storage on the server 2971 * yet. On the first pass, the byte range is worked out and the commit 2972 * rpc is done. On the second pass, ncl_writebp() is called to do the 2973 * job. 2974 */ 2975 again: 2976 off = (u_quad_t)-1; 2977 endoff = 0; 2978 bvecpos = 0; 2979 if (NFS_ISV34(vp) && commit) { 2980 if (bvec != NULL && bvec != bvec_on_stack) 2981 free(bvec, M_TEMP); 2982 /* 2983 * Count up how many buffers waiting for a commit. 2984 */ 2985 bveccount = 0; 2986 BO_LOCK(bo); 2987 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2988 if (!BUF_ISLOCKED(bp) && 2989 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2990 == (B_DELWRI | B_NEEDCOMMIT)) 2991 bveccount++; 2992 } 2993 /* 2994 * Allocate space to remember the list of bufs to commit. It is 2995 * important to use M_NOWAIT here to avoid a race with nfs_write. 2996 * If we can't get memory (for whatever reason), we will end up 2997 * committing the buffers one-by-one in the loop below. 2998 */ 2999 if (bveccount > NFS_COMMITBVECSIZ) { 3000 /* 3001 * Release the vnode interlock to avoid a lock 3002 * order reversal. 3003 */ 3004 BO_UNLOCK(bo); 3005 bvec = (struct buf **) 3006 malloc(bveccount * sizeof(struct buf *), 3007 M_TEMP, M_NOWAIT); 3008 BO_LOCK(bo); 3009 if (bvec == NULL) { 3010 bvec = bvec_on_stack; 3011 bvecsize = NFS_COMMITBVECSIZ; 3012 } else 3013 bvecsize = bveccount; 3014 } else { 3015 bvec = bvec_on_stack; 3016 bvecsize = NFS_COMMITBVECSIZ; 3017 } 3018 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3019 if (bvecpos >= bvecsize) 3020 break; 3021 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3022 nbp = TAILQ_NEXT(bp, b_bobufs); 3023 continue; 3024 } 3025 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3026 (B_DELWRI | B_NEEDCOMMIT)) { 3027 BUF_UNLOCK(bp); 3028 nbp = TAILQ_NEXT(bp, b_bobufs); 3029 continue; 3030 } 3031 BO_UNLOCK(bo); 3032 bremfree(bp); 3033 /* 3034 * Work out if all buffers are using the same cred 3035 * so we can deal with them all with one commit. 3036 * 3037 * NOTE: we are not clearing B_DONE here, so we have 3038 * to do it later on in this routine if we intend to 3039 * initiate I/O on the bp. 3040 * 3041 * Note: to avoid loopback deadlocks, we do not 3042 * assign b_runningbufspace. 3043 */ 3044 if (wcred == NULL) 3045 wcred = bp->b_wcred; 3046 else if (wcred != bp->b_wcred) 3047 wcred = NOCRED; 3048 vfs_busy_pages(bp, 1); 3049 3050 BO_LOCK(bo); 3051 /* 3052 * bp is protected by being locked, but nbp is not 3053 * and vfs_busy_pages() may sleep. We have to 3054 * recalculate nbp. 3055 */ 3056 nbp = TAILQ_NEXT(bp, b_bobufs); 3057 3058 /* 3059 * A list of these buffers is kept so that the 3060 * second loop knows which buffers have actually 3061 * been committed. This is necessary, since there 3062 * may be a race between the commit rpc and new 3063 * uncommitted writes on the file. 3064 */ 3065 bvec[bvecpos++] = bp; 3066 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3067 bp->b_dirtyoff; 3068 if (toff < off) 3069 off = toff; 3070 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 3071 if (toff > endoff) 3072 endoff = toff; 3073 } 3074 BO_UNLOCK(bo); 3075 } 3076 if (bvecpos > 0) { 3077 /* 3078 * Commit data on the server, as required. 3079 * If all bufs are using the same wcred, then use that with 3080 * one call for all of them, otherwise commit each one 3081 * separately. 3082 */ 3083 if (wcred != NOCRED) 3084 retv = ncl_commit(vp, off, (int)(endoff - off), 3085 wcred, td); 3086 else { 3087 retv = 0; 3088 for (i = 0; i < bvecpos; i++) { 3089 off_t off, size; 3090 bp = bvec[i]; 3091 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3092 bp->b_dirtyoff; 3093 size = (u_quad_t)(bp->b_dirtyend 3094 - bp->b_dirtyoff); 3095 retv = ncl_commit(vp, off, (int)size, 3096 bp->b_wcred, td); 3097 if (retv) break; 3098 } 3099 } 3100 3101 if (retv == NFSERR_STALEWRITEVERF) 3102 ncl_clearcommit(vp->v_mount); 3103 3104 /* 3105 * Now, either mark the blocks I/O done or mark the 3106 * blocks dirty, depending on whether the commit 3107 * succeeded. 3108 */ 3109 for (i = 0; i < bvecpos; i++) { 3110 bp = bvec[i]; 3111 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3112 if (!NFSCL_FORCEDISM(vp->v_mount) && retv) { 3113 /* 3114 * Error, leave B_DELWRI intact 3115 */ 3116 vfs_unbusy_pages(bp); 3117 brelse(bp); 3118 } else { 3119 /* 3120 * Success, remove B_DELWRI ( bundirty() ). 3121 * 3122 * b_dirtyoff/b_dirtyend seem to be NFS 3123 * specific. We should probably move that 3124 * into bundirty(). XXX 3125 */ 3126 bufobj_wref(bo); 3127 bp->b_flags |= B_ASYNC; 3128 bundirty(bp); 3129 bp->b_flags &= ~B_DONE; 3130 bp->b_ioflags &= ~BIO_ERROR; 3131 bp->b_dirtyoff = bp->b_dirtyend = 0; 3132 bufdone(bp); 3133 } 3134 } 3135 } 3136 3137 /* 3138 * Start/do any write(s) that are required. 3139 */ 3140 loop: 3141 BO_LOCK(bo); 3142 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3143 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3144 if (waitfor != MNT_WAIT || passone) 3145 continue; 3146 3147 error = BUF_TIMELOCK(bp, 3148 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 3149 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo); 3150 if (error == 0) { 3151 BUF_UNLOCK(bp); 3152 goto loop; 3153 } 3154 if (error == ENOLCK) { 3155 error = 0; 3156 goto loop; 3157 } 3158 if (called_from_renewthread != 0) { 3159 /* 3160 * Return EIO so the flush will be retried 3161 * later. 3162 */ 3163 error = EIO; 3164 goto done; 3165 } 3166 if (newnfs_sigintr(nmp, td)) { 3167 error = EINTR; 3168 goto done; 3169 } 3170 if (slpflag == PCATCH) { 3171 slpflag = 0; 3172 slptimeo = 2 * hz; 3173 } 3174 goto loop; 3175 } 3176 if ((bp->b_flags & B_DELWRI) == 0) 3177 panic("nfs_fsync: not dirty"); 3178 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3179 BUF_UNLOCK(bp); 3180 continue; 3181 } 3182 BO_UNLOCK(bo); 3183 bremfree(bp); 3184 bp->b_flags |= B_ASYNC; 3185 bwrite(bp); 3186 if (newnfs_sigintr(nmp, td)) { 3187 error = EINTR; 3188 goto done; 3189 } 3190 goto loop; 3191 } 3192 if (passone) { 3193 passone = 0; 3194 BO_UNLOCK(bo); 3195 goto again; 3196 } 3197 if (waitfor == MNT_WAIT) { 3198 while (bo->bo_numoutput) { 3199 error = bufobj_wwait(bo, slpflag, slptimeo); 3200 if (error) { 3201 BO_UNLOCK(bo); 3202 if (called_from_renewthread != 0) { 3203 /* 3204 * Return EIO so that the flush will be 3205 * retried later. 3206 */ 3207 error = EIO; 3208 goto done; 3209 } 3210 error = newnfs_sigintr(nmp, td); 3211 if (error) 3212 goto done; 3213 if (slpflag == PCATCH) { 3214 slpflag = 0; 3215 slptimeo = 2 * hz; 3216 } 3217 BO_LOCK(bo); 3218 } 3219 } 3220 if (bo->bo_dirty.bv_cnt != 0 && commit) { 3221 BO_UNLOCK(bo); 3222 goto loop; 3223 } 3224 /* 3225 * Wait for all the async IO requests to drain 3226 */ 3227 BO_UNLOCK(bo); 3228 NFSLOCKNODE(np); 3229 while (np->n_directio_asyncwr > 0) { 3230 np->n_flag |= NFSYNCWAIT; 3231 error = newnfs_msleep(td, &np->n_directio_asyncwr, 3232 &np->n_mtx, slpflag | (PRIBIO + 1), 3233 "nfsfsync", 0); 3234 if (error) { 3235 if (newnfs_sigintr(nmp, td)) { 3236 NFSUNLOCKNODE(np); 3237 error = EINTR; 3238 goto done; 3239 } 3240 } 3241 } 3242 NFSUNLOCKNODE(np); 3243 } else 3244 BO_UNLOCK(bo); 3245 if (NFSHASPNFS(nmp)) { 3246 nfscl_layoutcommit(vp, td); 3247 /* 3248 * Invalidate the attribute cache, since writes to a DS 3249 * won't update the size attribute. 3250 */ 3251 NFSLOCKNODE(np); 3252 np->n_attrstamp = 0; 3253 } else 3254 NFSLOCKNODE(np); 3255 if (np->n_flag & NWRITEERR) { 3256 error = np->n_error; 3257 np->n_flag &= ~NWRITEERR; 3258 } 3259 if (commit && bo->bo_dirty.bv_cnt == 0 && 3260 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) 3261 np->n_flag &= ~NMODIFIED; 3262 NFSUNLOCKNODE(np); 3263 done: 3264 if (bvec != NULL && bvec != bvec_on_stack) 3265 free(bvec, M_TEMP); 3266 if (error == 0 && commit != 0 && waitfor == MNT_WAIT && 3267 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 || 3268 np->n_directio_asyncwr != 0)) { 3269 if (trycnt++ < 5) { 3270 /* try, try again... */ 3271 passone = 1; 3272 wcred = NULL; 3273 bvec = NULL; 3274 bvecsize = 0; 3275 goto again; 3276 } 3277 vn_printf(vp, "ncl_flush failed"); 3278 error = called_from_renewthread != 0 ? EIO : EBUSY; 3279 } 3280 if (error == 0) { 3281 nanouptime(&ts); 3282 NFSLOCKNODE(np); 3283 np->n_localmodtime = ts; 3284 NFSUNLOCKNODE(np); 3285 } 3286 return (error); 3287 } 3288 3289 /* 3290 * NFS advisory byte-level locks. 3291 */ 3292 static int 3293 nfs_advlock(struct vop_advlock_args *ap) 3294 { 3295 struct vnode *vp = ap->a_vp; 3296 struct ucred *cred; 3297 struct nfsnode *np = VTONFS(ap->a_vp); 3298 struct proc *p = (struct proc *)ap->a_id; 3299 struct thread *td = curthread; /* XXX */ 3300 struct vattr va; 3301 int ret, error; 3302 u_quad_t size; 3303 struct nfsmount *nmp; 3304 3305 error = NFSVOPLOCK(vp, LK_SHARED); 3306 if (error != 0) 3307 return (EBADF); 3308 if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) { 3309 if (vp->v_type != VREG) { 3310 error = EINVAL; 3311 goto out; 3312 } 3313 if ((ap->a_flags & F_POSIX) != 0) 3314 cred = p->p_ucred; 3315 else 3316 cred = td->td_ucred; 3317 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 3318 if (VN_IS_DOOMED(vp)) { 3319 error = EBADF; 3320 goto out; 3321 } 3322 3323 /* 3324 * If this is unlocking a write locked region, flush and 3325 * commit them before unlocking. This is required by 3326 * RFC3530 Sec. 9.3.2. 3327 */ 3328 if (ap->a_op == F_UNLCK && 3329 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id, 3330 ap->a_flags)) 3331 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0); 3332 3333 /* 3334 * Mark NFS node as might have acquired a lock. 3335 * This is separate from NHASBEENLOCKED, because it must 3336 * be done before the nfsrpc_advlock() call, which might 3337 * add a nfscllock structure to the client state. 3338 * It is used to check for the case where a nfscllock 3339 * state structure cannot exist for the file. 3340 * Only done for "oneopenown" NFSv4.1/4.2 mounts. 3341 */ 3342 nmp = VFSTONFS(vp->v_mount); 3343 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp)) { 3344 NFSLOCKNODE(np); 3345 np->n_flag |= NMIGHTBELOCKED; 3346 NFSUNLOCKNODE(np); 3347 } 3348 3349 /* 3350 * Loop around doing the lock op, while a blocking lock 3351 * must wait for the lock op to succeed. 3352 */ 3353 do { 3354 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op, 3355 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags); 3356 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3357 ap->a_op == F_SETLK) { 3358 NFSVOPUNLOCK(vp); 3359 error = nfs_catnap(PZERO | PCATCH, ret, 3360 "ncladvl"); 3361 if (error) 3362 return (EINTR); 3363 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY); 3364 if (VN_IS_DOOMED(vp)) { 3365 error = EBADF; 3366 goto out; 3367 } 3368 } 3369 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3370 ap->a_op == F_SETLK); 3371 if (ret == NFSERR_DENIED) { 3372 error = EAGAIN; 3373 goto out; 3374 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) { 3375 error = ret; 3376 goto out; 3377 } else if (ret != 0) { 3378 error = EACCES; 3379 goto out; 3380 } 3381 3382 /* 3383 * Now, if we just got a lock, invalidate data in the buffer 3384 * cache, as required, so that the coherency conforms with 3385 * RFC3530 Sec. 9.3.2. 3386 */ 3387 if (ap->a_op == F_SETLK) { 3388 if ((np->n_flag & NMODIFIED) == 0) { 3389 np->n_attrstamp = 0; 3390 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3391 ret = VOP_GETATTR(vp, &va, cred); 3392 } 3393 if ((np->n_flag & NMODIFIED) || ret || 3394 np->n_change != va.va_filerev) { 3395 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1); 3396 np->n_attrstamp = 0; 3397 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3398 ret = VOP_GETATTR(vp, &va, cred); 3399 if (!ret) { 3400 np->n_mtime = va.va_mtime; 3401 np->n_change = va.va_filerev; 3402 } 3403 } 3404 /* Mark that a file lock has been acquired. */ 3405 NFSLOCKNODE(np); 3406 np->n_flag |= NHASBEENLOCKED; 3407 NFSUNLOCKNODE(np); 3408 } 3409 } else if (!NFS_ISV4(vp)) { 3410 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3411 size = VTONFS(vp)->n_size; 3412 NFSVOPUNLOCK(vp); 3413 error = lf_advlock(ap, &(vp->v_lockf), size); 3414 } else { 3415 if (nfs_advlock_p != NULL) 3416 error = nfs_advlock_p(ap); 3417 else { 3418 NFSVOPUNLOCK(vp); 3419 error = ENOLCK; 3420 } 3421 } 3422 if (error == 0 && ap->a_op == F_SETLK) { 3423 error = NFSVOPLOCK(vp, LK_SHARED); 3424 if (error == 0) { 3425 /* Mark that a file lock has been acquired. */ 3426 NFSLOCKNODE(np); 3427 np->n_flag |= NHASBEENLOCKED; 3428 NFSUNLOCKNODE(np); 3429 NFSVOPUNLOCK(vp); 3430 } 3431 } 3432 return (error); 3433 } else 3434 error = EOPNOTSUPP; 3435 out: 3436 NFSVOPUNLOCK(vp); 3437 return (error); 3438 } 3439 3440 /* 3441 * NFS advisory byte-level locks. 3442 */ 3443 static int 3444 nfs_advlockasync(struct vop_advlockasync_args *ap) 3445 { 3446 struct vnode *vp = ap->a_vp; 3447 u_quad_t size; 3448 int error; 3449 3450 if (NFS_ISV4(vp)) 3451 return (EOPNOTSUPP); 3452 error = NFSVOPLOCK(vp, LK_SHARED); 3453 if (error) 3454 return (error); 3455 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3456 size = VTONFS(vp)->n_size; 3457 NFSVOPUNLOCK(vp); 3458 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3459 } else { 3460 NFSVOPUNLOCK(vp); 3461 error = EOPNOTSUPP; 3462 } 3463 return (error); 3464 } 3465 3466 /* 3467 * Print out the contents of an nfsnode. 3468 */ 3469 static int 3470 nfs_print(struct vop_print_args *ap) 3471 { 3472 struct vnode *vp = ap->a_vp; 3473 struct nfsnode *np = VTONFS(vp); 3474 3475 printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid, 3476 (uintmax_t)np->n_vattr.na_fsid); 3477 if (vp->v_type == VFIFO) 3478 fifo_printinfo(vp); 3479 printf("\n"); 3480 return (0); 3481 } 3482 3483 /* 3484 * This is the "real" nfs::bwrite(struct buf*). 3485 * We set B_CACHE if this is a VMIO buffer. 3486 */ 3487 int 3488 ncl_writebp(struct buf *bp, int force __unused, struct thread *td) 3489 { 3490 int oldflags, rtval; 3491 3492 if (bp->b_flags & B_INVAL) { 3493 brelse(bp); 3494 return (0); 3495 } 3496 3497 oldflags = bp->b_flags; 3498 bp->b_flags |= B_CACHE; 3499 3500 /* 3501 * Undirty the bp. We will redirty it later if the I/O fails. 3502 */ 3503 bundirty(bp); 3504 bp->b_flags &= ~B_DONE; 3505 bp->b_ioflags &= ~BIO_ERROR; 3506 bp->b_iocmd = BIO_WRITE; 3507 3508 bufobj_wref(bp->b_bufobj); 3509 curthread->td_ru.ru_oublock++; 3510 3511 /* 3512 * Note: to avoid loopback deadlocks, we do not 3513 * assign b_runningbufspace. 3514 */ 3515 vfs_busy_pages(bp, 1); 3516 3517 BUF_KERNPROC(bp); 3518 bp->b_iooffset = dbtob(bp->b_blkno); 3519 bstrategy(bp); 3520 3521 if ((oldflags & B_ASYNC) != 0) 3522 return (0); 3523 3524 rtval = bufwait(bp); 3525 if (oldflags & B_DELWRI) 3526 reassignbuf(bp); 3527 brelse(bp); 3528 return (rtval); 3529 } 3530 3531 /* 3532 * nfs special file access vnode op. 3533 * Essentially just get vattr and then imitate iaccess() since the device is 3534 * local to the client. 3535 */ 3536 static int 3537 nfsspec_access(struct vop_access_args *ap) 3538 { 3539 struct vattr *vap; 3540 struct ucred *cred = ap->a_cred; 3541 struct vnode *vp = ap->a_vp; 3542 accmode_t accmode = ap->a_accmode; 3543 struct vattr vattr; 3544 int error; 3545 3546 /* 3547 * Disallow write attempts on filesystems mounted read-only; 3548 * unless the file is a socket, fifo, or a block or character 3549 * device resident on the filesystem. 3550 */ 3551 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3552 switch (vp->v_type) { 3553 case VREG: 3554 case VDIR: 3555 case VLNK: 3556 return (EROFS); 3557 default: 3558 break; 3559 } 3560 } 3561 vap = &vattr; 3562 error = VOP_GETATTR(vp, vap, cred); 3563 if (error) 3564 goto out; 3565 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3566 accmode, cred); 3567 out: 3568 return error; 3569 } 3570 3571 /* 3572 * Read wrapper for fifos. 3573 */ 3574 static int 3575 nfsfifo_read(struct vop_read_args *ap) 3576 { 3577 struct nfsnode *np = VTONFS(ap->a_vp); 3578 int error; 3579 3580 /* 3581 * Set access flag. 3582 */ 3583 NFSLOCKNODE(np); 3584 np->n_flag |= NACC; 3585 vfs_timestamp(&np->n_atim); 3586 NFSUNLOCKNODE(np); 3587 error = fifo_specops.vop_read(ap); 3588 return error; 3589 } 3590 3591 /* 3592 * Write wrapper for fifos. 3593 */ 3594 static int 3595 nfsfifo_write(struct vop_write_args *ap) 3596 { 3597 struct nfsnode *np = VTONFS(ap->a_vp); 3598 3599 /* 3600 * Set update flag. 3601 */ 3602 NFSLOCKNODE(np); 3603 np->n_flag |= NUPD; 3604 vfs_timestamp(&np->n_mtim); 3605 NFSUNLOCKNODE(np); 3606 return(fifo_specops.vop_write(ap)); 3607 } 3608 3609 /* 3610 * Close wrapper for fifos. 3611 * 3612 * Update the times on the nfsnode then do fifo close. 3613 */ 3614 static int 3615 nfsfifo_close(struct vop_close_args *ap) 3616 { 3617 struct vnode *vp = ap->a_vp; 3618 struct nfsnode *np = VTONFS(vp); 3619 struct vattr vattr; 3620 struct timespec ts; 3621 3622 NFSLOCKNODE(np); 3623 if (np->n_flag & (NACC | NUPD)) { 3624 vfs_timestamp(&ts); 3625 if (np->n_flag & NACC) 3626 np->n_atim = ts; 3627 if (np->n_flag & NUPD) 3628 np->n_mtim = ts; 3629 np->n_flag |= NCHG; 3630 if (vrefcnt(vp) == 1 && 3631 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3632 VATTR_NULL(&vattr); 3633 if (np->n_flag & NACC) 3634 vattr.va_atime = np->n_atim; 3635 if (np->n_flag & NUPD) 3636 vattr.va_mtime = np->n_mtim; 3637 NFSUNLOCKNODE(np); 3638 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3639 goto out; 3640 } 3641 } 3642 NFSUNLOCKNODE(np); 3643 out: 3644 return (fifo_specops.vop_close(ap)); 3645 } 3646 3647 /* 3648 * Just call ncl_writebp() with the force argument set to 1. 3649 * 3650 * NOTE: B_DONE may or may not be set in a_bp on call. 3651 */ 3652 static int 3653 nfs_bwrite(struct buf *bp) 3654 { 3655 3656 return (ncl_writebp(bp, 1, curthread)); 3657 } 3658 3659 struct buf_ops buf_ops_newnfs = { 3660 .bop_name = "buf_ops_nfs", 3661 .bop_write = nfs_bwrite, 3662 .bop_strategy = bufstrategy, 3663 .bop_sync = bufsync, 3664 .bop_bdflush = bufbdflush, 3665 }; 3666 3667 static int 3668 nfs_getacl(struct vop_getacl_args *ap) 3669 { 3670 int error; 3671 3672 if (ap->a_type != ACL_TYPE_NFS4) 3673 return (EOPNOTSUPP); 3674 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3675 NULL); 3676 if (error > NFSERR_STALE) { 3677 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3678 error = EPERM; 3679 } 3680 return (error); 3681 } 3682 3683 static int 3684 nfs_setacl(struct vop_setacl_args *ap) 3685 { 3686 int error; 3687 3688 if (ap->a_type != ACL_TYPE_NFS4) 3689 return (EOPNOTSUPP); 3690 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3691 NULL); 3692 if (error > NFSERR_STALE) { 3693 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3694 error = EPERM; 3695 } 3696 return (error); 3697 } 3698 3699 /* 3700 * VOP_ADVISE for NFS. 3701 * Just return 0 for any errors, since it is just a hint. 3702 */ 3703 static int 3704 nfs_advise(struct vop_advise_args *ap) 3705 { 3706 struct thread *td = curthread; 3707 struct nfsmount *nmp; 3708 uint64_t len; 3709 int error; 3710 3711 /* 3712 * First do vop_stdadvise() to handle the buffer cache. 3713 */ 3714 error = vop_stdadvise(ap); 3715 if (error != 0) 3716 return (error); 3717 if (ap->a_start < 0 || ap->a_end < 0) 3718 return (0); 3719 if (ap->a_end == OFF_MAX) 3720 len = 0; 3721 else if (ap->a_end < ap->a_start) 3722 return (0); 3723 else 3724 len = ap->a_end - ap->a_start + 1; 3725 nmp = VFSTONFS(ap->a_vp->v_mount); 3726 mtx_lock(&nmp->nm_mtx); 3727 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3728 (NFSHASPNFS(nmp) && (nmp->nm_privflag & NFSMNTP_IOADVISETHRUMDS) == 3729 0) || (nmp->nm_privflag & NFSMNTP_NOADVISE) != 0) { 3730 mtx_unlock(&nmp->nm_mtx); 3731 return (0); 3732 } 3733 mtx_unlock(&nmp->nm_mtx); 3734 error = nfsrpc_advise(ap->a_vp, ap->a_start, len, ap->a_advice, 3735 td->td_ucred, td); 3736 if (error == NFSERR_NOTSUPP) { 3737 mtx_lock(&nmp->nm_mtx); 3738 nmp->nm_privflag |= NFSMNTP_NOADVISE; 3739 mtx_unlock(&nmp->nm_mtx); 3740 } 3741 return (0); 3742 } 3743 3744 /* 3745 * nfs allocate call 3746 */ 3747 static int 3748 nfs_allocate(struct vop_allocate_args *ap) 3749 { 3750 struct vnode *vp = ap->a_vp; 3751 struct thread *td = curthread; 3752 struct nfsvattr nfsva; 3753 struct nfsmount *nmp; 3754 struct nfsnode *np; 3755 off_t alen; 3756 int attrflag, error, ret; 3757 struct timespec ts; 3758 3759 attrflag = 0; 3760 nmp = VFSTONFS(vp->v_mount); 3761 np = VTONFS(vp); 3762 mtx_lock(&nmp->nm_mtx); 3763 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION && 3764 (nmp->nm_privflag & NFSMNTP_NOALLOCATE) == 0) { 3765 mtx_unlock(&nmp->nm_mtx); 3766 /* 3767 * Flush first to ensure that the allocate adds to the 3768 * file's allocation on the server. 3769 */ 3770 error = ncl_flush(vp, MNT_WAIT, td, 1, 0); 3771 if (error == 0) { 3772 alen = *ap->a_len; 3773 if ((uint64_t)alen > nfs_maxalloclen) 3774 alen = nfs_maxalloclen; 3775 error = nfsrpc_allocate(vp, *ap->a_offset, alen, 3776 &nfsva, &attrflag, ap->a_cred, td, NULL); 3777 } 3778 if (error == 0) { 3779 *ap->a_offset += alen; 3780 *ap->a_len -= alen; 3781 nanouptime(&ts); 3782 NFSLOCKNODE(np); 3783 np->n_localmodtime = ts; 3784 NFSUNLOCKNODE(np); 3785 } else if (error == NFSERR_NOTSUPP) { 3786 mtx_lock(&nmp->nm_mtx); 3787 nmp->nm_privflag |= NFSMNTP_NOALLOCATE; 3788 mtx_unlock(&nmp->nm_mtx); 3789 error = EINVAL; 3790 } 3791 } else { 3792 mtx_unlock(&nmp->nm_mtx); 3793 error = EINVAL; 3794 } 3795 if (attrflag != 0) { 3796 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 3797 if (error == 0 && ret != 0) 3798 error = ret; 3799 } 3800 if (error != 0) 3801 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 3802 return (error); 3803 } 3804 3805 /* 3806 * nfs deallocate call 3807 */ 3808 static int 3809 nfs_deallocate(struct vop_deallocate_args *ap) 3810 { 3811 struct vnode *vp = ap->a_vp; 3812 struct thread *td = curthread; 3813 struct nfsvattr nfsva; 3814 struct nfsmount *nmp; 3815 struct nfsnode *np; 3816 off_t tlen, mlen; 3817 int attrflag, error, ret; 3818 bool clipped; 3819 struct timespec ts; 3820 3821 error = 0; 3822 attrflag = 0; 3823 nmp = VFSTONFS(vp->v_mount); 3824 np = VTONFS(vp); 3825 mtx_lock(&nmp->nm_mtx); 3826 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION && 3827 (nmp->nm_privflag & NFSMNTP_NODEALLOCATE) == 0) { 3828 mtx_unlock(&nmp->nm_mtx); 3829 tlen = omin(OFF_MAX - *ap->a_offset, *ap->a_len); 3830 NFSCL_DEBUG(4, "dealloc: off=%jd len=%jd maxfilesize=%ju\n", 3831 (intmax_t)*ap->a_offset, (intmax_t)tlen, 3832 (uintmax_t)nmp->nm_maxfilesize); 3833 if ((uint64_t)*ap->a_offset >= nmp->nm_maxfilesize) { 3834 /* Avoid EFBIG error return from the NFSv4.2 server. */ 3835 *ap->a_len = 0; 3836 return (0); 3837 } 3838 clipped = false; 3839 if ((uint64_t)*ap->a_offset + tlen > nmp->nm_maxfilesize) 3840 tlen = nmp->nm_maxfilesize - *ap->a_offset; 3841 if ((uint64_t)*ap->a_offset < np->n_size) { 3842 /* Limit the len to nfs_maxalloclen before EOF. */ 3843 mlen = omin((off_t)np->n_size - *ap->a_offset, tlen); 3844 if ((uint64_t)mlen > nfs_maxalloclen) { 3845 NFSCL_DEBUG(4, "dealloc: tlen maxalloclen\n"); 3846 tlen = nfs_maxalloclen; 3847 clipped = true; 3848 } 3849 } 3850 if (error == 0) 3851 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 3852 if (error == 0) { 3853 vnode_pager_purge_range(vp, *ap->a_offset, 3854 *ap->a_offset + tlen); 3855 error = nfsrpc_deallocate(vp, *ap->a_offset, tlen, 3856 &nfsva, &attrflag, ap->a_cred, td, NULL); 3857 NFSCL_DEBUG(4, "dealloc: rpc=%d\n", error); 3858 } 3859 if (error == 0) { 3860 NFSCL_DEBUG(4, "dealloc: attrflag=%d na_size=%ju\n", 3861 attrflag, (uintmax_t)nfsva.na_size); 3862 nanouptime(&ts); 3863 NFSLOCKNODE(np); 3864 np->n_localmodtime = ts; 3865 NFSUNLOCKNODE(np); 3866 if (attrflag != 0) { 3867 if ((uint64_t)*ap->a_offset < nfsva.na_size) 3868 *ap->a_offset += omin((off_t) 3869 nfsva.na_size - *ap->a_offset, 3870 tlen); 3871 } 3872 if (clipped && tlen < *ap->a_len) 3873 *ap->a_len -= tlen; 3874 else 3875 *ap->a_len = 0; 3876 } else if (error == NFSERR_NOTSUPP) { 3877 mtx_lock(&nmp->nm_mtx); 3878 nmp->nm_privflag |= NFSMNTP_NODEALLOCATE; 3879 mtx_unlock(&nmp->nm_mtx); 3880 } 3881 } else { 3882 mtx_unlock(&nmp->nm_mtx); 3883 error = EIO; 3884 } 3885 /* 3886 * If the NFS server cannot perform the Deallocate operation, just call 3887 * vop_stddeallocate() to perform it. 3888 */ 3889 if (error != 0 && error != NFSERR_FBIG && error != NFSERR_INVAL) { 3890 error = vop_stddeallocate(ap); 3891 NFSCL_DEBUG(4, "dealloc: stddeallocate=%d\n", error); 3892 } 3893 if (attrflag != 0) { 3894 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 3895 if (error == 0 && ret != 0) 3896 error = ret; 3897 } 3898 if (error != 0) 3899 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 3900 return (error); 3901 } 3902 3903 /* 3904 * nfs copy_file_range call 3905 */ 3906 static int 3907 nfs_copy_file_range(struct vop_copy_file_range_args *ap) 3908 { 3909 struct vnode *invp = ap->a_invp; 3910 struct vnode *outvp = ap->a_outvp; 3911 struct mount *mp; 3912 struct nfsvattr innfsva, outnfsva; 3913 struct vattr *vap; 3914 struct uio io; 3915 struct nfsmount *nmp; 3916 size_t len, len2; 3917 int error, inattrflag, outattrflag, ret, ret2; 3918 off_t inoff, outoff; 3919 bool consecutive, must_commit, tryoutcred; 3920 3921 ret = ret2 = 0; 3922 nmp = VFSTONFS(invp->v_mount); 3923 mtx_lock(&nmp->nm_mtx); 3924 /* NFSv4.2 Copy is not permitted for infile == outfile. */ 3925 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3926 (nmp->nm_privflag & NFSMNTP_NOCOPY) != 0 || invp == outvp) { 3927 mtx_unlock(&nmp->nm_mtx); 3928 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 3929 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, 3930 ap->a_incred, ap->a_outcred, ap->a_fsizetd); 3931 return (error); 3932 } 3933 mtx_unlock(&nmp->nm_mtx); 3934 3935 /* Lock both vnodes, avoiding risk of deadlock. */ 3936 do { 3937 mp = NULL; 3938 error = vn_start_write(outvp, &mp, V_WAIT); 3939 if (error == 0) { 3940 error = vn_lock(outvp, LK_EXCLUSIVE); 3941 if (error == 0) { 3942 error = vn_lock(invp, LK_SHARED | LK_NOWAIT); 3943 if (error == 0) 3944 break; 3945 VOP_UNLOCK(outvp); 3946 if (mp != NULL) 3947 vn_finished_write(mp); 3948 mp = NULL; 3949 error = vn_lock(invp, LK_SHARED); 3950 if (error == 0) 3951 VOP_UNLOCK(invp); 3952 } 3953 } 3954 if (mp != NULL) 3955 vn_finished_write(mp); 3956 } while (error == 0); 3957 if (error != 0) 3958 return (error); 3959 3960 /* 3961 * Do the vn_rlimit_fsize() check. Should this be above the VOP layer? 3962 */ 3963 io.uio_offset = *ap->a_outoffp; 3964 io.uio_resid = *ap->a_lenp; 3965 error = vn_rlimit_fsize(outvp, &io, ap->a_fsizetd); 3966 3967 /* 3968 * Flush the input file so that the data is up to date before 3969 * the copy. Flush writes for the output file so that they 3970 * do not overwrite the data copied to the output file by the Copy. 3971 * Set the commit argument for both flushes so that the data is on 3972 * stable storage before the Copy RPC. This is done in case the 3973 * server reboots during the Copy and needs to be redone. 3974 */ 3975 if (error == 0) 3976 error = ncl_flush(invp, MNT_WAIT, curthread, 1, 0); 3977 if (error == 0) 3978 error = ncl_flush(outvp, MNT_WAIT, curthread, 1, 0); 3979 3980 /* Do the actual NFSv4.2 RPC. */ 3981 len = *ap->a_lenp; 3982 mtx_lock(&nmp->nm_mtx); 3983 if ((nmp->nm_privflag & NFSMNTP_NOCONSECUTIVE) == 0) 3984 consecutive = true; 3985 else 3986 consecutive = false; 3987 mtx_unlock(&nmp->nm_mtx); 3988 inoff = *ap->a_inoffp; 3989 outoff = *ap->a_outoffp; 3990 tryoutcred = true; 3991 must_commit = false; 3992 if (error == 0) { 3993 vap = &VTONFS(invp)->n_vattr.na_vattr; 3994 error = VOP_GETATTR(invp, vap, ap->a_incred); 3995 if (error == 0) { 3996 /* 3997 * Clip "len" at va_size so that RFC compliant servers 3998 * will not reply NFSERR_INVAL. 3999 * Setting "len == 0" for the RPC would be preferred, 4000 * but some Linux servers do not support that. 4001 */ 4002 if (inoff >= vap->va_size) 4003 *ap->a_lenp = len = 0; 4004 else if (inoff + len > vap->va_size) 4005 *ap->a_lenp = len = vap->va_size - inoff; 4006 } else 4007 error = 0; 4008 } 4009 4010 /* 4011 * len will be set to 0 upon a successful Copy RPC. 4012 * As such, this only loops when the Copy RPC needs to be retried. 4013 */ 4014 while (len > 0 && error == 0) { 4015 inattrflag = outattrflag = 0; 4016 len2 = len; 4017 if (tryoutcred) 4018 error = nfsrpc_copy_file_range(invp, ap->a_inoffp, 4019 outvp, ap->a_outoffp, &len2, ap->a_flags, 4020 &inattrflag, &innfsva, &outattrflag, &outnfsva, 4021 ap->a_outcred, consecutive, &must_commit); 4022 else 4023 error = nfsrpc_copy_file_range(invp, ap->a_inoffp, 4024 outvp, ap->a_outoffp, &len2, ap->a_flags, 4025 &inattrflag, &innfsva, &outattrflag, &outnfsva, 4026 ap->a_incred, consecutive, &must_commit); 4027 if (inattrflag != 0) 4028 ret = nfscl_loadattrcache(&invp, &innfsva, NULL, NULL, 4029 0, 1); 4030 if (outattrflag != 0) 4031 ret2 = nfscl_loadattrcache(&outvp, &outnfsva, NULL, 4032 NULL, 1, 1); 4033 if (error == 0) { 4034 if (consecutive == false) { 4035 if (len2 == len) { 4036 mtx_lock(&nmp->nm_mtx); 4037 nmp->nm_privflag |= 4038 NFSMNTP_NOCONSECUTIVE; 4039 mtx_unlock(&nmp->nm_mtx); 4040 } else 4041 error = NFSERR_OFFLOADNOREQS; 4042 } 4043 *ap->a_lenp = len2; 4044 len = 0; 4045 if (len2 > 0 && must_commit && error == 0) 4046 error = ncl_commit(outvp, outoff, *ap->a_lenp, 4047 ap->a_outcred, curthread); 4048 if (error == 0 && ret != 0) 4049 error = ret; 4050 if (error == 0 && ret2 != 0) 4051 error = ret2; 4052 } else if (error == NFSERR_OFFLOADNOREQS && consecutive) { 4053 /* 4054 * Try consecutive == false, which is ok only if all 4055 * bytes are copied. 4056 * If only some bytes were copied when consecutive 4057 * is false, there is no way to know which bytes 4058 * still need to be written. 4059 */ 4060 consecutive = false; 4061 error = 0; 4062 } else if (error == NFSERR_ACCES && tryoutcred) { 4063 /* Try again with incred. */ 4064 tryoutcred = false; 4065 error = 0; 4066 } 4067 if (error == NFSERR_STALEWRITEVERF) { 4068 /* 4069 * Server rebooted, so do it all again. 4070 */ 4071 *ap->a_inoffp = inoff; 4072 *ap->a_outoffp = outoff; 4073 len = *ap->a_lenp; 4074 must_commit = false; 4075 error = 0; 4076 } 4077 } 4078 VOP_UNLOCK(invp); 4079 VOP_UNLOCK(outvp); 4080 if (mp != NULL) 4081 vn_finished_write(mp); 4082 if (error == NFSERR_NOTSUPP || error == NFSERR_OFFLOADNOREQS || 4083 error == NFSERR_ACCES) { 4084 /* 4085 * Unlike the NFSv4.2 Copy, vn_generic_copy_file_range() can 4086 * use a_incred for the read and a_outcred for the write, so 4087 * try this for NFSERR_ACCES failures for the Copy. 4088 * For NFSERR_NOTSUPP and NFSERR_OFFLOADNOREQS, the Copy can 4089 * never succeed, so disable it. 4090 */ 4091 if (error != NFSERR_ACCES) { 4092 /* Can never do Copy on this mount. */ 4093 mtx_lock(&nmp->nm_mtx); 4094 nmp->nm_privflag |= NFSMNTP_NOCOPY; 4095 mtx_unlock(&nmp->nm_mtx); 4096 } 4097 *ap->a_inoffp = inoff; 4098 *ap->a_outoffp = outoff; 4099 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 4100 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, 4101 ap->a_incred, ap->a_outcred, ap->a_fsizetd); 4102 } else if (error != 0) 4103 *ap->a_lenp = 0; 4104 4105 if (error != 0) 4106 error = nfscl_maperr(curthread, error, (uid_t)0, (gid_t)0); 4107 return (error); 4108 } 4109 4110 /* 4111 * nfs ioctl call 4112 */ 4113 static int 4114 nfs_ioctl(struct vop_ioctl_args *ap) 4115 { 4116 struct vnode *vp = ap->a_vp; 4117 struct nfsvattr nfsva; 4118 struct nfsmount *nmp; 4119 int attrflag, content, error, ret; 4120 bool eof = false; /* shut up compiler. */ 4121 4122 if (vp->v_type != VREG) 4123 return (ENOTTY); 4124 nmp = VFSTONFS(vp->v_mount); 4125 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) { 4126 error = vop_stdioctl(ap); 4127 return (error); 4128 } 4129 4130 /* Do the actual NFSv4.2 RPC. */ 4131 switch (ap->a_command) { 4132 case FIOSEEKDATA: 4133 content = NFSV4CONTENT_DATA; 4134 break; 4135 case FIOSEEKHOLE: 4136 content = NFSV4CONTENT_HOLE; 4137 break; 4138 default: 4139 return (ENOTTY); 4140 } 4141 4142 error = vn_lock(vp, LK_SHARED); 4143 if (error != 0) 4144 return (EBADF); 4145 attrflag = 0; 4146 if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size) 4147 error = ENXIO; 4148 else { 4149 /* 4150 * Flush all writes, so that the server is up to date. 4151 * Although a Commit is not required, the commit argument 4152 * is set so that, for a pNFS File/Flexible File Layout 4153 * server, the LayoutCommit will be done to ensure the file 4154 * size is up to date on the Metadata Server. 4155 */ 4156 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0); 4157 if (error == 0) 4158 error = nfsrpc_seek(vp, (off_t *)ap->a_data, &eof, 4159 content, ap->a_cred, &nfsva, &attrflag); 4160 /* If at eof for FIOSEEKDATA, return ENXIO. */ 4161 if (eof && error == 0 && content == NFSV4CONTENT_DATA) 4162 error = ENXIO; 4163 } 4164 if (attrflag != 0) { 4165 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4166 if (error == 0 && ret != 0) 4167 error = ret; 4168 } 4169 NFSVOPUNLOCK(vp); 4170 4171 if (error != 0) 4172 error = ENXIO; 4173 return (error); 4174 } 4175 4176 /* 4177 * nfs getextattr call 4178 */ 4179 static int 4180 nfs_getextattr(struct vop_getextattr_args *ap) 4181 { 4182 struct vnode *vp = ap->a_vp; 4183 struct nfsmount *nmp; 4184 struct ucred *cred; 4185 struct thread *td = ap->a_td; 4186 struct nfsvattr nfsva; 4187 ssize_t len; 4188 int attrflag, error, ret; 4189 4190 nmp = VFSTONFS(vp->v_mount); 4191 mtx_lock(&nmp->nm_mtx); 4192 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4193 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4194 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4195 mtx_unlock(&nmp->nm_mtx); 4196 return (EOPNOTSUPP); 4197 } 4198 mtx_unlock(&nmp->nm_mtx); 4199 4200 cred = ap->a_cred; 4201 if (cred == NULL) 4202 cred = td->td_ucred; 4203 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4204 attrflag = 0; 4205 error = nfsrpc_getextattr(vp, ap->a_name, ap->a_uio, &len, &nfsva, 4206 &attrflag, cred, td); 4207 if (attrflag != 0) { 4208 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4209 if (error == 0 && ret != 0) 4210 error = ret; 4211 } 4212 if (error == 0 && ap->a_size != NULL) 4213 *ap->a_size = len; 4214 4215 switch (error) { 4216 case NFSERR_NOTSUPP: 4217 case NFSERR_OPILLEGAL: 4218 mtx_lock(&nmp->nm_mtx); 4219 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4220 mtx_unlock(&nmp->nm_mtx); 4221 error = EOPNOTSUPP; 4222 break; 4223 case NFSERR_NOXATTR: 4224 case NFSERR_XATTR2BIG: 4225 error = ENOATTR; 4226 break; 4227 default: 4228 error = nfscl_maperr(td, error, 0, 0); 4229 break; 4230 } 4231 return (error); 4232 } 4233 4234 /* 4235 * nfs setextattr call 4236 */ 4237 static int 4238 nfs_setextattr(struct vop_setextattr_args *ap) 4239 { 4240 struct vnode *vp = ap->a_vp; 4241 struct nfsmount *nmp; 4242 struct ucred *cred; 4243 struct thread *td = ap->a_td; 4244 struct nfsvattr nfsva; 4245 int attrflag, error, ret; 4246 4247 nmp = VFSTONFS(vp->v_mount); 4248 mtx_lock(&nmp->nm_mtx); 4249 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4250 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4251 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4252 mtx_unlock(&nmp->nm_mtx); 4253 return (EOPNOTSUPP); 4254 } 4255 mtx_unlock(&nmp->nm_mtx); 4256 4257 if (ap->a_uio->uio_resid < 0) 4258 return (EINVAL); 4259 cred = ap->a_cred; 4260 if (cred == NULL) 4261 cred = td->td_ucred; 4262 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4263 attrflag = 0; 4264 error = nfsrpc_setextattr(vp, ap->a_name, ap->a_uio, &nfsva, 4265 &attrflag, cred, td); 4266 if (attrflag != 0) { 4267 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4268 if (error == 0 && ret != 0) 4269 error = ret; 4270 } 4271 4272 switch (error) { 4273 case NFSERR_NOTSUPP: 4274 case NFSERR_OPILLEGAL: 4275 mtx_lock(&nmp->nm_mtx); 4276 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4277 mtx_unlock(&nmp->nm_mtx); 4278 error = EOPNOTSUPP; 4279 break; 4280 case NFSERR_NOXATTR: 4281 case NFSERR_XATTR2BIG: 4282 error = ENOATTR; 4283 break; 4284 default: 4285 error = nfscl_maperr(td, error, 0, 0); 4286 break; 4287 } 4288 return (error); 4289 } 4290 4291 /* 4292 * nfs listextattr call 4293 */ 4294 static int 4295 nfs_listextattr(struct vop_listextattr_args *ap) 4296 { 4297 struct vnode *vp = ap->a_vp; 4298 struct nfsmount *nmp; 4299 struct ucred *cred; 4300 struct thread *td = ap->a_td; 4301 struct nfsvattr nfsva; 4302 size_t len, len2; 4303 uint64_t cookie; 4304 int attrflag, error, ret; 4305 bool eof; 4306 4307 nmp = VFSTONFS(vp->v_mount); 4308 mtx_lock(&nmp->nm_mtx); 4309 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4310 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4311 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4312 mtx_unlock(&nmp->nm_mtx); 4313 return (EOPNOTSUPP); 4314 } 4315 mtx_unlock(&nmp->nm_mtx); 4316 4317 cred = ap->a_cred; 4318 if (cred == NULL) 4319 cred = td->td_ucred; 4320 4321 /* Loop around doing List Extended Attribute RPCs. */ 4322 eof = false; 4323 cookie = 0; 4324 len2 = 0; 4325 error = 0; 4326 while (!eof && error == 0) { 4327 len = nmp->nm_rsize; 4328 attrflag = 0; 4329 error = nfsrpc_listextattr(vp, &cookie, ap->a_uio, &len, &eof, 4330 &nfsva, &attrflag, cred, td); 4331 if (attrflag != 0) { 4332 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 4333 1); 4334 if (error == 0 && ret != 0) 4335 error = ret; 4336 } 4337 if (error == 0) { 4338 len2 += len; 4339 if (len2 > SSIZE_MAX) 4340 error = ENOATTR; 4341 } 4342 } 4343 if (error == 0 && ap->a_size != NULL) 4344 *ap->a_size = len2; 4345 4346 switch (error) { 4347 case NFSERR_NOTSUPP: 4348 case NFSERR_OPILLEGAL: 4349 mtx_lock(&nmp->nm_mtx); 4350 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4351 mtx_unlock(&nmp->nm_mtx); 4352 error = EOPNOTSUPP; 4353 break; 4354 case NFSERR_NOXATTR: 4355 case NFSERR_XATTR2BIG: 4356 error = ENOATTR; 4357 break; 4358 default: 4359 error = nfscl_maperr(td, error, 0, 0); 4360 break; 4361 } 4362 return (error); 4363 } 4364 4365 /* 4366 * nfs setextattr call 4367 */ 4368 static int 4369 nfs_deleteextattr(struct vop_deleteextattr_args *ap) 4370 { 4371 struct vnode *vp = ap->a_vp; 4372 struct nfsmount *nmp; 4373 struct nfsvattr nfsva; 4374 int attrflag, error, ret; 4375 4376 nmp = VFSTONFS(vp->v_mount); 4377 mtx_lock(&nmp->nm_mtx); 4378 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4379 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4380 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4381 mtx_unlock(&nmp->nm_mtx); 4382 return (EOPNOTSUPP); 4383 } 4384 mtx_unlock(&nmp->nm_mtx); 4385 4386 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4387 attrflag = 0; 4388 error = nfsrpc_rmextattr(vp, ap->a_name, &nfsva, &attrflag, ap->a_cred, 4389 ap->a_td); 4390 if (attrflag != 0) { 4391 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4392 if (error == 0 && ret != 0) 4393 error = ret; 4394 } 4395 4396 switch (error) { 4397 case NFSERR_NOTSUPP: 4398 case NFSERR_OPILLEGAL: 4399 mtx_lock(&nmp->nm_mtx); 4400 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4401 mtx_unlock(&nmp->nm_mtx); 4402 error = EOPNOTSUPP; 4403 break; 4404 case NFSERR_NOXATTR: 4405 case NFSERR_XATTR2BIG: 4406 error = ENOATTR; 4407 break; 4408 default: 4409 error = nfscl_maperr(ap->a_td, error, 0, 0); 4410 break; 4411 } 4412 return (error); 4413 } 4414 4415 /* 4416 * Return POSIX pathconf information applicable to nfs filesystems. 4417 */ 4418 static int 4419 nfs_pathconf(struct vop_pathconf_args *ap) 4420 { 4421 struct nfsv3_pathconf pc; 4422 struct nfsvattr nfsva; 4423 struct vnode *vp = ap->a_vp; 4424 struct nfsmount *nmp; 4425 struct thread *td = curthread; 4426 off_t off; 4427 bool eof; 4428 int attrflag, error; 4429 4430 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX || 4431 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED || 4432 ap->a_name == _PC_NO_TRUNC)) || 4433 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) { 4434 /* 4435 * Since only the above 4 a_names are returned by the NFSv3 4436 * Pathconf RPC, there is no point in doing it for others. 4437 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can 4438 * be used for _PC_NFS4_ACL as well. 4439 */ 4440 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva, 4441 &attrflag, NULL); 4442 if (attrflag != 0) 4443 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 4444 1); 4445 if (error != 0) 4446 return (error); 4447 } else { 4448 /* 4449 * For NFSv2 (or NFSv3 when not one of the above 4 a_names), 4450 * just fake them. 4451 */ 4452 pc.pc_linkmax = NFS_LINK_MAX; 4453 pc.pc_namemax = NFS_MAXNAMLEN; 4454 pc.pc_notrunc = 1; 4455 pc.pc_chownrestricted = 1; 4456 pc.pc_caseinsensitive = 0; 4457 pc.pc_casepreserving = 1; 4458 error = 0; 4459 } 4460 switch (ap->a_name) { 4461 case _PC_LINK_MAX: 4462 #ifdef _LP64 4463 *ap->a_retval = pc.pc_linkmax; 4464 #else 4465 *ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax); 4466 #endif 4467 break; 4468 case _PC_NAME_MAX: 4469 *ap->a_retval = pc.pc_namemax; 4470 break; 4471 case _PC_PIPE_BUF: 4472 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 4473 *ap->a_retval = PIPE_BUF; 4474 else 4475 error = EINVAL; 4476 break; 4477 case _PC_CHOWN_RESTRICTED: 4478 *ap->a_retval = pc.pc_chownrestricted; 4479 break; 4480 case _PC_NO_TRUNC: 4481 *ap->a_retval = pc.pc_notrunc; 4482 break; 4483 case _PC_ACL_NFS4: 4484 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 && 4485 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL)) 4486 *ap->a_retval = 1; 4487 else 4488 *ap->a_retval = 0; 4489 break; 4490 case _PC_ACL_PATH_MAX: 4491 if (NFS_ISV4(vp)) 4492 *ap->a_retval = ACL_MAX_ENTRIES; 4493 else 4494 *ap->a_retval = 3; 4495 break; 4496 case _PC_PRIO_IO: 4497 *ap->a_retval = 0; 4498 break; 4499 case _PC_SYNC_IO: 4500 *ap->a_retval = 0; 4501 break; 4502 case _PC_ALLOC_SIZE_MIN: 4503 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize; 4504 break; 4505 case _PC_FILESIZEBITS: 4506 if (NFS_ISV34(vp)) 4507 *ap->a_retval = 64; 4508 else 4509 *ap->a_retval = 32; 4510 break; 4511 case _PC_REC_INCR_XFER_SIZE: 4512 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4513 break; 4514 case _PC_REC_MAX_XFER_SIZE: 4515 *ap->a_retval = -1; /* means ``unlimited'' */ 4516 break; 4517 case _PC_REC_MIN_XFER_SIZE: 4518 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4519 break; 4520 case _PC_REC_XFER_ALIGN: 4521 *ap->a_retval = PAGE_SIZE; 4522 break; 4523 case _PC_SYMLINK_MAX: 4524 *ap->a_retval = NFS_MAXPATHLEN; 4525 break; 4526 case _PC_MIN_HOLE_SIZE: 4527 /* Only some NFSv4.2 servers support Seek for Holes. */ 4528 *ap->a_retval = 0; 4529 nmp = VFSTONFS(vp->v_mount); 4530 if (NFS_ISV4(vp) && nmp->nm_minorvers == NFSV42_MINORVERSION) { 4531 /* 4532 * NFSv4.2 doesn't have an attribute for hole size, 4533 * so all we can do is see if the Seek operation is 4534 * supported and then use f_iosize as a "best guess". 4535 */ 4536 mtx_lock(&nmp->nm_mtx); 4537 if ((nmp->nm_privflag & NFSMNTP_SEEKTESTED) == 0) { 4538 mtx_unlock(&nmp->nm_mtx); 4539 off = 0; 4540 attrflag = 0; 4541 error = nfsrpc_seek(vp, &off, &eof, 4542 NFSV4CONTENT_HOLE, td->td_ucred, &nfsva, 4543 &attrflag); 4544 if (attrflag != 0) 4545 nfscl_loadattrcache(&vp, &nfsva, 4546 NULL, NULL, 0, 1); 4547 mtx_lock(&nmp->nm_mtx); 4548 if (error == NFSERR_NOTSUPP) 4549 nmp->nm_privflag |= NFSMNTP_SEEKTESTED; 4550 else 4551 nmp->nm_privflag |= NFSMNTP_SEEKTESTED | 4552 NFSMNTP_SEEK; 4553 error = 0; 4554 } 4555 if ((nmp->nm_privflag & NFSMNTP_SEEK) != 0) 4556 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4557 mtx_unlock(&nmp->nm_mtx); 4558 } 4559 break; 4560 4561 default: 4562 error = vop_stdpathconf(ap); 4563 break; 4564 } 4565 return (error); 4566 } 4567