1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from nfs_vnops.c 8.16 (Berkeley) 5/27/95 35 */ 36 37 #include <sys/cdefs.h> 38 /* 39 * vnode op calls for Sun NFS version 2, 3 and 4 40 */ 41 42 #include "opt_inet.h" 43 44 #include <sys/param.h> 45 #include <sys/kernel.h> 46 #include <sys/systm.h> 47 #include <sys/resourcevar.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 #include <sys/bio.h> 51 #include <sys/buf.h> 52 #include <sys/extattr.h> 53 #include <sys/filio.h> 54 #include <sys/jail.h> 55 #include <sys/malloc.h> 56 #include <sys/mbuf.h> 57 #include <sys/namei.h> 58 #include <sys/socket.h> 59 #include <sys/vnode.h> 60 #include <sys/dirent.h> 61 #include <sys/fcntl.h> 62 #include <sys/lockf.h> 63 #include <sys/stat.h> 64 #include <sys/sysctl.h> 65 #include <sys/signalvar.h> 66 67 #include <vm/vm.h> 68 #include <vm/vm_extern.h> 69 #include <vm/vm_object.h> 70 71 #include <fs/nfs/nfsport.h> 72 #include <fs/nfsclient/nfsnode.h> 73 #include <fs/nfsclient/nfsmount.h> 74 #include <fs/nfsclient/nfs.h> 75 #include <fs/nfsclient/nfs_kdtrace.h> 76 77 #include <net/if.h> 78 #include <netinet/in.h> 79 #include <netinet/in_var.h> 80 81 #include <nfs/nfs_lock.h> 82 83 #ifdef KDTRACE_HOOKS 84 #include <sys/dtrace_bsd.h> 85 86 dtrace_nfsclient_accesscache_flush_probe_func_t 87 dtrace_nfscl_accesscache_flush_done_probe; 88 uint32_t nfscl_accesscache_flush_done_id; 89 90 dtrace_nfsclient_accesscache_get_probe_func_t 91 dtrace_nfscl_accesscache_get_hit_probe, 92 dtrace_nfscl_accesscache_get_miss_probe; 93 uint32_t nfscl_accesscache_get_hit_id; 94 uint32_t nfscl_accesscache_get_miss_id; 95 96 dtrace_nfsclient_accesscache_load_probe_func_t 97 dtrace_nfscl_accesscache_load_done_probe; 98 uint32_t nfscl_accesscache_load_done_id; 99 #endif /* !KDTRACE_HOOKS */ 100 101 /* Defs */ 102 #define TRUE 1 103 #define FALSE 0 104 105 extern struct nfsstatsv1 nfsstatsv1; 106 extern int nfsrv_useacl; 107 extern int nfscl_debuglevel; 108 MALLOC_DECLARE(M_NEWNFSREQ); 109 110 static vop_read_t nfsfifo_read; 111 static vop_write_t nfsfifo_write; 112 static vop_close_t nfsfifo_close; 113 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *, 114 struct thread *); 115 static vop_lookup_t nfs_lookup; 116 static vop_create_t nfs_create; 117 static vop_mknod_t nfs_mknod; 118 static vop_open_t nfs_open; 119 static vop_pathconf_t nfs_pathconf; 120 static vop_close_t nfs_close; 121 static vop_access_t nfs_access; 122 static vop_getattr_t nfs_getattr; 123 static vop_setattr_t nfs_setattr; 124 static vop_read_t nfs_read; 125 static vop_fsync_t nfs_fsync; 126 static vop_remove_t nfs_remove; 127 static vop_link_t nfs_link; 128 static vop_rename_t nfs_rename; 129 static vop_mkdir_t nfs_mkdir; 130 static vop_rmdir_t nfs_rmdir; 131 static vop_symlink_t nfs_symlink; 132 static vop_readdir_t nfs_readdir; 133 static vop_strategy_t nfs_strategy; 134 static int nfs_lookitup(struct vnode *, char *, int, 135 struct ucred *, struct thread *, struct nfsnode **); 136 static int nfs_sillyrename(struct vnode *, struct vnode *, 137 struct componentname *); 138 static vop_access_t nfsspec_access; 139 static vop_readlink_t nfs_readlink; 140 static vop_print_t nfs_print; 141 static vop_advlock_t nfs_advlock; 142 static vop_advlockasync_t nfs_advlockasync; 143 static vop_getacl_t nfs_getacl; 144 static vop_setacl_t nfs_setacl; 145 static vop_advise_t nfs_advise; 146 static vop_allocate_t nfs_allocate; 147 static vop_deallocate_t nfs_deallocate; 148 static vop_copy_file_range_t nfs_copy_file_range; 149 static vop_ioctl_t nfs_ioctl; 150 static vop_getextattr_t nfs_getextattr; 151 static vop_setextattr_t nfs_setextattr; 152 static vop_listextattr_t nfs_listextattr; 153 static vop_deleteextattr_t nfs_deleteextattr; 154 static vop_lock1_t nfs_lock; 155 156 /* 157 * Global vfs data structures for nfs 158 */ 159 160 static struct vop_vector newnfs_vnodeops_nosig = { 161 .vop_default = &default_vnodeops, 162 .vop_access = nfs_access, 163 .vop_advlock = nfs_advlock, 164 .vop_advlockasync = nfs_advlockasync, 165 .vop_close = nfs_close, 166 .vop_create = nfs_create, 167 .vop_fsync = nfs_fsync, 168 .vop_getattr = nfs_getattr, 169 .vop_getpages = ncl_getpages, 170 .vop_putpages = ncl_putpages, 171 .vop_inactive = ncl_inactive, 172 .vop_link = nfs_link, 173 .vop_lock1 = nfs_lock, 174 .vop_lookup = nfs_lookup, 175 .vop_mkdir = nfs_mkdir, 176 .vop_mknod = nfs_mknod, 177 .vop_open = nfs_open, 178 .vop_pathconf = nfs_pathconf, 179 .vop_print = nfs_print, 180 .vop_read = nfs_read, 181 .vop_readdir = nfs_readdir, 182 .vop_readlink = nfs_readlink, 183 .vop_reclaim = ncl_reclaim, 184 .vop_remove = nfs_remove, 185 .vop_rename = nfs_rename, 186 .vop_rmdir = nfs_rmdir, 187 .vop_setattr = nfs_setattr, 188 .vop_strategy = nfs_strategy, 189 .vop_symlink = nfs_symlink, 190 .vop_write = ncl_write, 191 .vop_getacl = nfs_getacl, 192 .vop_setacl = nfs_setacl, 193 .vop_advise = nfs_advise, 194 .vop_allocate = nfs_allocate, 195 .vop_deallocate = nfs_deallocate, 196 .vop_copy_file_range = nfs_copy_file_range, 197 .vop_ioctl = nfs_ioctl, 198 .vop_getextattr = nfs_getextattr, 199 .vop_setextattr = nfs_setextattr, 200 .vop_listextattr = nfs_listextattr, 201 .vop_deleteextattr = nfs_deleteextattr, 202 }; 203 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops_nosig); 204 205 static int 206 nfs_vnodeops_bypass(struct vop_generic_args *a) 207 { 208 209 return (vop_sigdefer(&newnfs_vnodeops_nosig, a)); 210 } 211 212 struct vop_vector newnfs_vnodeops = { 213 .vop_default = &default_vnodeops, 214 .vop_bypass = nfs_vnodeops_bypass, 215 }; 216 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops); 217 218 static struct vop_vector newnfs_fifoops_nosig = { 219 .vop_default = &fifo_specops, 220 .vop_access = nfsspec_access, 221 .vop_close = nfsfifo_close, 222 .vop_fsync = nfs_fsync, 223 .vop_getattr = nfs_getattr, 224 .vop_inactive = ncl_inactive, 225 .vop_pathconf = nfs_pathconf, 226 .vop_print = nfs_print, 227 .vop_read = nfsfifo_read, 228 .vop_reclaim = ncl_reclaim, 229 .vop_setattr = nfs_setattr, 230 .vop_write = nfsfifo_write, 231 }; 232 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops_nosig); 233 234 static int 235 nfs_fifoops_bypass(struct vop_generic_args *a) 236 { 237 238 return (vop_sigdefer(&newnfs_fifoops_nosig, a)); 239 } 240 241 struct vop_vector newnfs_fifoops = { 242 .vop_default = &default_vnodeops, 243 .vop_bypass = nfs_fifoops_bypass, 244 }; 245 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops); 246 247 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 248 struct componentname *cnp, struct vattr *vap); 249 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 250 int namelen, struct ucred *cred, struct thread *td); 251 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, 252 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp, 253 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td); 254 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp, 255 struct componentname *scnp, struct sillyrename *sp); 256 257 /* 258 * Global variables 259 */ 260 SYSCTL_DECL(_vfs_nfs); 261 262 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 263 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 264 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 265 266 static int nfs_prime_access_cache = 0; 267 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW, 268 &nfs_prime_access_cache, 0, 269 "Prime NFS ACCESS cache when fetching attributes"); 270 271 static int newnfs_commit_on_close = 0; 272 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW, 273 &newnfs_commit_on_close, 0, "write+commit on close, else only write"); 274 275 static int nfs_clean_pages_on_close = 1; 276 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, 277 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); 278 279 int newnfs_directio_enable = 0; 280 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 281 &newnfs_directio_enable, 0, "Enable NFS directio"); 282 283 int nfs_keep_dirty_on_error; 284 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW, 285 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned"); 286 287 /* 288 * This sysctl allows other processes to mmap a file that has been opened 289 * O_DIRECT by a process. In general, having processes mmap the file while 290 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 291 * this by default to prevent DoS attacks - to prevent a malicious user from 292 * opening up files O_DIRECT preventing other users from mmap'ing these 293 * files. "Protected" environments where stricter consistency guarantees are 294 * required can disable this knob. The process that opened the file O_DIRECT 295 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 296 * meaningful. 297 */ 298 int newnfs_directio_allow_mmap = 1; 299 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 300 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 301 302 static uint64_t nfs_maxalloclen = 64 * 1024 * 1024; 303 SYSCTL_U64(_vfs_nfs, OID_AUTO, maxalloclen, CTLFLAG_RW, 304 &nfs_maxalloclen, 0, "NFS max allocate/deallocate length"); 305 306 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \ 307 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \ 308 | NFSACCESS_DELETE | NFSACCESS_LOOKUP) 309 310 /* 311 * SMP Locking Note : 312 * The list of locks after the description of the lock is the ordering 313 * of other locks acquired with the lock held. 314 * np->n_mtx : Protects the fields in the nfsnode. 315 VM Object Lock 316 VI_MTX (acquired indirectly) 317 * nmp->nm_mtx : Protects the fields in the nfsmount. 318 rep->r_mtx 319 * ncl_iod_mutex : Global lock, protects shared nfsiod state. 320 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. 321 nmp->nm_mtx 322 rep->r_mtx 323 * rep->r_mtx : Protects the fields in an nfsreq. 324 */ 325 326 static int 327 nfs_lock(struct vop_lock1_args *ap) 328 { 329 struct vnode *vp; 330 struct nfsnode *np; 331 u_quad_t nsize; 332 int error, lktype; 333 bool onfault; 334 335 vp = ap->a_vp; 336 lktype = ap->a_flags & LK_TYPE_MASK; 337 error = VOP_LOCK1_APV(&default_vnodeops, ap); 338 if (error != 0 || vp->v_op != &newnfs_vnodeops) 339 return (error); 340 np = VTONFS(vp); 341 if (np == NULL) 342 return (0); 343 NFSLOCKNODE(np); 344 if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED && 345 lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE && 346 lktype != LK_TRYUPGRADE)) { 347 NFSUNLOCKNODE(np); 348 return (0); 349 } 350 onfault = (ap->a_flags & LK_EATTR_MASK) == LK_NOWAIT && 351 (ap->a_flags & LK_INIT_MASK) == LK_CANRECURSE && 352 (lktype == LK_SHARED || lktype == LK_EXCLUSIVE); 353 if (onfault && vp->v_vnlock->lk_recurse == 0) { 354 /* 355 * Force retry in vm_fault(), to make the lock request 356 * sleepable, which allows us to piggy-back the 357 * sleepable call to vnode_pager_setsize(). 358 */ 359 NFSUNLOCKNODE(np); 360 VOP_UNLOCK(vp); 361 return (EBUSY); 362 } 363 if ((ap->a_flags & LK_NOWAIT) != 0 || 364 (lktype == LK_SHARED && vp->v_vnlock->lk_recurse > 0)) { 365 NFSUNLOCKNODE(np); 366 return (0); 367 } 368 if (lktype == LK_SHARED) { 369 NFSUNLOCKNODE(np); 370 VOP_UNLOCK(vp); 371 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 372 ap->a_flags |= LK_EXCLUSIVE; 373 error = VOP_LOCK1_APV(&default_vnodeops, ap); 374 if (error != 0 || vp->v_op != &newnfs_vnodeops) 375 return (error); 376 if (vp->v_data == NULL) 377 goto downgrade; 378 MPASS(vp->v_data == np); 379 NFSLOCKNODE(np); 380 if ((np->n_flag & NVNSETSZSKIP) == 0) { 381 NFSUNLOCKNODE(np); 382 goto downgrade; 383 } 384 } 385 np->n_flag &= ~NVNSETSZSKIP; 386 nsize = np->n_size; 387 NFSUNLOCKNODE(np); 388 vnode_pager_setsize(vp, nsize); 389 downgrade: 390 if (lktype == LK_SHARED) { 391 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 392 ap->a_flags |= LK_DOWNGRADE; 393 (void)VOP_LOCK1_APV(&default_vnodeops, ap); 394 } 395 return (0); 396 } 397 398 static int 399 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td, 400 struct ucred *cred, u_int32_t *retmode) 401 { 402 int error = 0, attrflag, i, lrupos; 403 u_int32_t rmode; 404 struct nfsnode *np = VTONFS(vp); 405 struct nfsvattr nfsva; 406 407 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag, 408 &rmode); 409 if (attrflag) 410 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 411 if (!error) { 412 lrupos = 0; 413 NFSLOCKNODE(np); 414 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 415 if (np->n_accesscache[i].uid == cred->cr_uid) { 416 np->n_accesscache[i].mode = rmode; 417 np->n_accesscache[i].stamp = time_second; 418 break; 419 } 420 if (i > 0 && np->n_accesscache[i].stamp < 421 np->n_accesscache[lrupos].stamp) 422 lrupos = i; 423 } 424 if (i == NFS_ACCESSCACHESIZE) { 425 np->n_accesscache[lrupos].uid = cred->cr_uid; 426 np->n_accesscache[lrupos].mode = rmode; 427 np->n_accesscache[lrupos].stamp = time_second; 428 } 429 NFSUNLOCKNODE(np); 430 if (retmode != NULL) 431 *retmode = rmode; 432 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0); 433 } else if (NFS_ISV4(vp)) { 434 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 435 } 436 #ifdef KDTRACE_HOOKS 437 if (error != 0) 438 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0, 439 error); 440 #endif 441 return (error); 442 } 443 444 /* 445 * nfs access vnode op. 446 * For nfs version 2, just return ok. File accesses may fail later. 447 * For nfs version 3, use the access rpc to check accessibility. If file modes 448 * are changed on the server, accesses might still fail later. 449 */ 450 static int 451 nfs_access(struct vop_access_args *ap) 452 { 453 struct vnode *vp = ap->a_vp; 454 int error = 0, i, gotahit; 455 u_int32_t mode, wmode, rmode; 456 int v34 = NFS_ISV34(vp); 457 struct nfsnode *np = VTONFS(vp); 458 459 /* 460 * Disallow write attempts on filesystems mounted read-only; 461 * unless the file is a socket, fifo, or a block or character 462 * device resident on the filesystem. 463 */ 464 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS | 465 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL | 466 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { 467 switch (vp->v_type) { 468 case VREG: 469 case VDIR: 470 case VLNK: 471 return (EROFS); 472 default: 473 break; 474 } 475 } 476 /* 477 * For nfs v3 or v4, check to see if we have done this recently, and if 478 * so return our cached result instead of making an ACCESS call. 479 * If not, do an access rpc, otherwise you are stuck emulating 480 * ufs_access() locally using the vattr. This may not be correct, 481 * since the server may apply other access criteria such as 482 * client uid-->server uid mapping that we do not know about. 483 */ 484 if (v34) { 485 if (ap->a_accmode & VREAD) 486 mode = NFSACCESS_READ; 487 else 488 mode = 0; 489 if (vp->v_type != VDIR) { 490 if (ap->a_accmode & VWRITE) 491 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 492 if (ap->a_accmode & VAPPEND) 493 mode |= NFSACCESS_EXTEND; 494 if (ap->a_accmode & VEXEC) 495 mode |= NFSACCESS_EXECUTE; 496 if (ap->a_accmode & VDELETE) 497 mode |= NFSACCESS_DELETE; 498 } else { 499 if (ap->a_accmode & VWRITE) 500 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 501 if (ap->a_accmode & VAPPEND) 502 mode |= NFSACCESS_EXTEND; 503 if (ap->a_accmode & VEXEC) 504 mode |= NFSACCESS_LOOKUP; 505 if (ap->a_accmode & VDELETE) 506 mode |= NFSACCESS_DELETE; 507 if (ap->a_accmode & VDELETE_CHILD) 508 mode |= NFSACCESS_MODIFY; 509 } 510 /* XXX safety belt, only make blanket request if caching */ 511 if (nfsaccess_cache_timeout > 0) { 512 wmode = NFSACCESS_READ | NFSACCESS_MODIFY | 513 NFSACCESS_EXTEND | NFSACCESS_EXECUTE | 514 NFSACCESS_DELETE | NFSACCESS_LOOKUP; 515 } else { 516 wmode = mode; 517 } 518 519 /* 520 * Does our cached result allow us to give a definite yes to 521 * this request? 522 */ 523 gotahit = 0; 524 NFSLOCKNODE(np); 525 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 526 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) { 527 if (time_second < (np->n_accesscache[i].stamp 528 + nfsaccess_cache_timeout) && 529 (np->n_accesscache[i].mode & mode) == mode) { 530 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits); 531 gotahit = 1; 532 } 533 break; 534 } 535 } 536 NFSUNLOCKNODE(np); 537 #ifdef KDTRACE_HOOKS 538 if (gotahit != 0) 539 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp, 540 ap->a_cred->cr_uid, mode); 541 else 542 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp, 543 ap->a_cred->cr_uid, mode); 544 #endif 545 if (gotahit == 0) { 546 /* 547 * Either a no, or a don't know. Go to the wire. 548 */ 549 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 550 error = nfs34_access_otw(vp, wmode, ap->a_td, 551 ap->a_cred, &rmode); 552 if (!error && 553 (rmode & mode) != mode) 554 error = EACCES; 555 } 556 return (error); 557 } else { 558 if ((error = nfsspec_access(ap)) != 0) { 559 return (error); 560 } 561 /* 562 * Attempt to prevent a mapped root from accessing a file 563 * which it shouldn't. We try to read a byte from the file 564 * if the user is root and the file is not zero length. 565 * After calling nfsspec_access, we should have the correct 566 * file size cached. 567 */ 568 NFSLOCKNODE(np); 569 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD) 570 && VTONFS(vp)->n_size > 0) { 571 struct iovec aiov; 572 struct uio auio; 573 char buf[1]; 574 575 NFSUNLOCKNODE(np); 576 aiov.iov_base = buf; 577 aiov.iov_len = 1; 578 auio.uio_iov = &aiov; 579 auio.uio_iovcnt = 1; 580 auio.uio_offset = 0; 581 auio.uio_resid = 1; 582 auio.uio_segflg = UIO_SYSSPACE; 583 auio.uio_rw = UIO_READ; 584 auio.uio_td = ap->a_td; 585 586 if (vp->v_type == VREG) 587 error = ncl_readrpc(vp, &auio, ap->a_cred); 588 else if (vp->v_type == VDIR) { 589 char* bp; 590 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 591 aiov.iov_base = bp; 592 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 593 error = ncl_readdirrpc(vp, &auio, ap->a_cred, 594 ap->a_td); 595 free(bp, M_TEMP); 596 } else if (vp->v_type == VLNK) 597 error = ncl_readlinkrpc(vp, &auio, ap->a_cred); 598 else 599 error = EACCES; 600 } else 601 NFSUNLOCKNODE(np); 602 return (error); 603 } 604 } 605 606 /* 607 * nfs open vnode op 608 * Check to see if the type is ok 609 * and that deletion is not in progress. 610 * For paged in text files, you will need to flush the page cache 611 * if consistency is lost. 612 */ 613 /* ARGSUSED */ 614 static int 615 nfs_open(struct vop_open_args *ap) 616 { 617 struct vnode *vp = ap->a_vp; 618 struct nfsnode *np = VTONFS(vp); 619 struct vattr vattr; 620 int error; 621 int fmode = ap->a_mode; 622 struct ucred *cred; 623 vm_object_t obj; 624 625 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 626 return (EOPNOTSUPP); 627 628 /* 629 * For NFSv4, we need to do the Open Op before cache validation, 630 * so that we conform to RFC3530 Sec. 9.3.1. 631 */ 632 if (NFS_ISV4(vp)) { 633 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td); 634 if (error) { 635 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 636 (gid_t)0); 637 return (error); 638 } 639 } 640 641 /* 642 * Now, if this Open will be doing reading, re-validate/flush the 643 * cache, so that Close/Open coherency is maintained. 644 */ 645 NFSLOCKNODE(np); 646 if (np->n_flag & NMODIFIED) { 647 NFSUNLOCKNODE(np); 648 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 649 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 650 if (VN_IS_DOOMED(vp)) 651 return (EBADF); 652 } 653 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 654 if (error == EINTR || error == EIO) { 655 if (NFS_ISV4(vp)) 656 (void) nfsrpc_close(vp, 0, ap->a_td); 657 return (error); 658 } 659 NFSLOCKNODE(np); 660 np->n_attrstamp = 0; 661 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 662 if (vp->v_type == VDIR) 663 np->n_direofoffset = 0; 664 NFSUNLOCKNODE(np); 665 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 666 if (error) { 667 if (NFS_ISV4(vp)) 668 (void) nfsrpc_close(vp, 0, ap->a_td); 669 return (error); 670 } 671 NFSLOCKNODE(np); 672 np->n_mtime = vattr.va_mtime; 673 if (NFS_ISV4(vp)) 674 np->n_change = vattr.va_filerev; 675 } else { 676 NFSUNLOCKNODE(np); 677 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 678 if (error) { 679 if (NFS_ISV4(vp)) 680 (void) nfsrpc_close(vp, 0, ap->a_td); 681 return (error); 682 } 683 NFSLOCKNODE(np); 684 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) || 685 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 686 if (vp->v_type == VDIR) 687 np->n_direofoffset = 0; 688 NFSUNLOCKNODE(np); 689 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 690 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 691 if (VN_IS_DOOMED(vp)) 692 return (EBADF); 693 } 694 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 695 if (error == EINTR || error == EIO) { 696 if (NFS_ISV4(vp)) 697 (void) nfsrpc_close(vp, 0, ap->a_td); 698 return (error); 699 } 700 NFSLOCKNODE(np); 701 np->n_mtime = vattr.va_mtime; 702 if (NFS_ISV4(vp)) 703 np->n_change = vattr.va_filerev; 704 } 705 } 706 707 /* 708 * If the object has >= 1 O_DIRECT active opens, we disable caching. 709 */ 710 if (newnfs_directio_enable && (fmode & O_DIRECT) && 711 (vp->v_type == VREG)) { 712 if (np->n_directio_opens == 0) { 713 NFSUNLOCKNODE(np); 714 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 715 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 716 if (VN_IS_DOOMED(vp)) 717 return (EBADF); 718 } 719 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 720 if (error) { 721 if (NFS_ISV4(vp)) 722 (void) nfsrpc_close(vp, 0, ap->a_td); 723 return (error); 724 } 725 NFSLOCKNODE(np); 726 np->n_flag |= NNONCACHE; 727 } 728 np->n_directio_opens++; 729 } 730 731 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */ 732 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0) 733 np->n_flag |= NWRITEOPENED; 734 735 /* 736 * If this is an open for writing, capture a reference to the 737 * credentials, so they can be used by ncl_putpages(). Using 738 * these write credentials is preferable to the credentials of 739 * whatever thread happens to be doing the VOP_PUTPAGES() since 740 * the write RPCs are less likely to fail with EACCES. 741 */ 742 if ((fmode & FWRITE) != 0) { 743 cred = np->n_writecred; 744 np->n_writecred = crhold(ap->a_cred); 745 } else 746 cred = NULL; 747 NFSUNLOCKNODE(np); 748 749 if (cred != NULL) 750 crfree(cred); 751 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 752 753 /* 754 * If the text file has been mmap'd, flush any dirty pages to the 755 * buffer cache and then... 756 * Make sure all writes are pushed to the NFS server. If this is not 757 * done, the modify time of the file can change while the text 758 * file is being executed. This will cause the process that is 759 * executing the text file to be terminated. 760 */ 761 if (vp->v_writecount <= -1) { 762 if ((obj = vp->v_object) != NULL && 763 vm_object_mightbedirty(obj)) { 764 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 765 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 766 if (VN_IS_DOOMED(vp)) 767 return (EBADF); 768 } 769 VM_OBJECT_WLOCK(obj); 770 vm_object_page_clean(obj, 0, 0, OBJPC_SYNC); 771 VM_OBJECT_WUNLOCK(obj); 772 } 773 774 /* Now, flush the buffer cache. */ 775 ncl_flush(vp, MNT_WAIT, curthread, 0, 0); 776 777 /* And, finally, make sure that n_mtime is up to date. */ 778 np = VTONFS(vp); 779 NFSLOCKNODE(np); 780 np->n_mtime = np->n_vattr.na_mtime; 781 NFSUNLOCKNODE(np); 782 } 783 return (0); 784 } 785 786 /* 787 * nfs close vnode op 788 * What an NFS client should do upon close after writing is a debatable issue. 789 * Most NFS clients push delayed writes to the server upon close, basically for 790 * two reasons: 791 * 1 - So that any write errors may be reported back to the client process 792 * doing the close system call. By far the two most likely errors are 793 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 794 * 2 - To put a worst case upper bound on cache inconsistency between 795 * multiple clients for the file. 796 * There is also a consistency problem for Version 2 of the protocol w.r.t. 797 * not being able to tell if other clients are writing a file concurrently, 798 * since there is no way of knowing if the changed modify time in the reply 799 * is only due to the write for this client. 800 * (NFS Version 3 provides weak cache consistency data in the reply that 801 * should be sufficient to detect and handle this case.) 802 * 803 * The current code does the following: 804 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 805 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 806 * or commit them (this satisfies 1 and 2 except for the 807 * case where the server crashes after this close but 808 * before the commit RPC, which is felt to be "good 809 * enough". Changing the last argument to ncl_flush() to 810 * a 1 would force a commit operation, if it is felt a 811 * commit is necessary now. 812 * for NFS Version 4 - flush the dirty buffers and commit them, if 813 * nfscl_mustflush() says this is necessary. 814 * It is necessary if there is no write delegation held, 815 * in order to satisfy open/close coherency. 816 * If the file isn't cached on local stable storage, 817 * it may be necessary in order to detect "out of space" 818 * errors from the server, if the write delegation 819 * issued by the server doesn't allow the file to grow. 820 */ 821 /* ARGSUSED */ 822 static int 823 nfs_close(struct vop_close_args *ap) 824 { 825 struct vnode *vp = ap->a_vp; 826 struct nfsnode *np = VTONFS(vp); 827 struct nfsvattr nfsva; 828 struct ucred *cred; 829 int error = 0, ret, localcred = 0; 830 int fmode = ap->a_fflag; 831 832 if (NFSCL_FORCEDISM(vp->v_mount)) 833 return (0); 834 /* 835 * During shutdown, a_cred isn't valid, so just use root. 836 */ 837 if (ap->a_cred == NOCRED) { 838 cred = newnfs_getcred(); 839 localcred = 1; 840 } else { 841 cred = ap->a_cred; 842 } 843 if (vp->v_type == VREG) { 844 /* 845 * Examine and clean dirty pages, regardless of NMODIFIED. 846 * This closes a major hole in close-to-open consistency. 847 * We want to push out all dirty pages (and buffers) on 848 * close, regardless of whether they were dirtied by 849 * mmap'ed writes or via write(). 850 */ 851 if (nfs_clean_pages_on_close && vp->v_object) { 852 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 853 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 854 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK) 855 return (EBADF); 856 } 857 VM_OBJECT_WLOCK(vp->v_object); 858 vm_object_page_clean(vp->v_object, 0, 0, 0); 859 VM_OBJECT_WUNLOCK(vp->v_object); 860 } 861 NFSLOCKNODE(np); 862 if (np->n_flag & NMODIFIED) { 863 NFSUNLOCKNODE(np); 864 if (NFS_ISV3(vp)) { 865 /* 866 * Under NFSv3 we have dirty buffers to dispose of. We 867 * must flush them to the NFS server. We have the option 868 * of waiting all the way through the commit rpc or just 869 * waiting for the initial write. The default is to only 870 * wait through the initial write so the data is in the 871 * server's cache, which is roughly similar to the state 872 * a standard disk subsystem leaves the file in on close(). 873 * 874 * We cannot clear the NMODIFIED bit in np->n_flag due to 875 * potential races with other processes, and certainly 876 * cannot clear it if we don't commit. 877 * These races occur when there is no longer the old 878 * traditional vnode locking implemented for Vnode Ops. 879 */ 880 int cm = newnfs_commit_on_close ? 1 : 0; 881 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 882 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 883 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK) 884 return (EBADF); 885 } 886 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0); 887 /* np->n_flag &= ~NMODIFIED; */ 888 } else if (NFS_ISV4(vp)) { 889 if (nfscl_mustflush(vp) != 0) { 890 int cm = newnfs_commit_on_close ? 1 : 0; 891 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 892 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 893 if (VN_IS_DOOMED(vp) && ap->a_fflag != 894 FNONBLOCK) 895 return (EBADF); 896 } 897 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 898 cm, 0); 899 /* 900 * as above w.r.t races when clearing 901 * NMODIFIED. 902 * np->n_flag &= ~NMODIFIED; 903 */ 904 } 905 } else { 906 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 907 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 908 if (VN_IS_DOOMED(vp) && ap->a_fflag != 909 FNONBLOCK) 910 return (EBADF); 911 } 912 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 913 } 914 NFSLOCKNODE(np); 915 } 916 /* 917 * Invalidate the attribute cache in all cases. 918 * An open is going to fetch fresh attrs any way, other procs 919 * on this node that have file open will be forced to do an 920 * otw attr fetch, but this is safe. 921 * --> A user found that their RPC count dropped by 20% when 922 * this was commented out and I can't see any requirement 923 * for it, so I've disabled it when negative lookups are 924 * enabled. (What does this have to do with negative lookup 925 * caching? Well nothing, except it was reported by the 926 * same user that needed negative lookup caching and I wanted 927 * there to be a way to disable it to see if it 928 * is the cause of some caching/coherency issue that might 929 * crop up.) 930 */ 931 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) { 932 np->n_attrstamp = 0; 933 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 934 } 935 if (np->n_flag & NWRITEERR) { 936 np->n_flag &= ~NWRITEERR; 937 error = np->n_error; 938 } 939 NFSUNLOCKNODE(np); 940 } 941 942 if (NFS_ISV4(vp)) { 943 /* 944 * Get attributes so "change" is up to date. 945 */ 946 if (error == 0 && nfscl_mustflush(vp) != 0 && 947 vp->v_type == VREG && 948 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) { 949 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva); 950 if (!ret) { 951 np->n_change = nfsva.na_filerev; 952 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 953 0, 0); 954 } 955 } 956 957 /* 958 * and do the close. 959 */ 960 ret = nfsrpc_close(vp, 0, ap->a_td); 961 if (!error && ret) 962 error = ret; 963 if (error) 964 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 965 (gid_t)0); 966 } 967 if (newnfs_directio_enable) 968 KASSERT((np->n_directio_asyncwr == 0), 969 ("nfs_close: dirty unflushed (%d) directio buffers\n", 970 np->n_directio_asyncwr)); 971 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 972 NFSLOCKNODE(np); 973 KASSERT((np->n_directio_opens > 0), 974 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 975 np->n_directio_opens--; 976 if (np->n_directio_opens == 0) 977 np->n_flag &= ~NNONCACHE; 978 NFSUNLOCKNODE(np); 979 } 980 if (localcred) 981 NFSFREECRED(cred); 982 return (error); 983 } 984 985 /* 986 * nfs getattr call from vfs. 987 */ 988 static int 989 nfs_getattr(struct vop_getattr_args *ap) 990 { 991 struct vnode *vp = ap->a_vp; 992 struct thread *td = curthread; /* XXX */ 993 struct nfsnode *np = VTONFS(vp); 994 int error = 0; 995 struct nfsvattr nfsva; 996 struct vattr *vap = ap->a_vap; 997 struct vattr vattr; 998 struct nfsmount *nmp; 999 1000 nmp = VFSTONFS(vp->v_mount); 1001 /* 1002 * Update local times for special files. 1003 */ 1004 NFSLOCKNODE(np); 1005 if (np->n_flag & (NACC | NUPD)) 1006 np->n_flag |= NCHG; 1007 NFSUNLOCKNODE(np); 1008 /* 1009 * First look in the cache. 1010 * For "syskrb5" mounts, nm_fhsize might still be zero and 1011 * cached attributes should be ignored. 1012 */ 1013 if (nmp->nm_fhsize > 0 && ncl_getattrcache(vp, &vattr) == 0) { 1014 ncl_copy_vattr(vap, &vattr); 1015 1016 /* 1017 * Get the local modify time for the case of a write 1018 * delegation. 1019 */ 1020 nfscl_deleggetmodtime(vp, &vap->va_mtime); 1021 return (0); 1022 } 1023 1024 if (NFS_ISV34(vp) && nfs_prime_access_cache && 1025 nfsaccess_cache_timeout > 0) { 1026 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 1027 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL); 1028 if (ncl_getattrcache(vp, ap->a_vap) == 0) { 1029 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime); 1030 return (0); 1031 } 1032 } 1033 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva); 1034 if (!error) 1035 error = nfscl_loadattrcache(&vp, &nfsva, vap, 0, 0); 1036 if (!error) { 1037 /* 1038 * Get the local modify time for the case of a write 1039 * delegation. 1040 */ 1041 nfscl_deleggetmodtime(vp, &vap->va_mtime); 1042 } else if (NFS_ISV4(vp)) { 1043 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1044 } 1045 return (error); 1046 } 1047 1048 /* 1049 * nfs setattr call. 1050 */ 1051 static int 1052 nfs_setattr(struct vop_setattr_args *ap) 1053 { 1054 struct vnode *vp = ap->a_vp; 1055 struct nfsnode *np = VTONFS(vp); 1056 struct thread *td = curthread; /* XXX */ 1057 struct vattr *vap = ap->a_vap; 1058 int error = 0; 1059 u_quad_t tsize; 1060 struct timespec ts; 1061 1062 #ifndef nolint 1063 tsize = (u_quad_t)0; 1064 #endif 1065 1066 /* 1067 * Setting of flags and marking of atimes are not supported. 1068 */ 1069 if (vap->va_flags != VNOVAL) 1070 return (EOPNOTSUPP); 1071 1072 /* 1073 * Disallow write attempts if the filesystem is mounted read-only. 1074 */ 1075 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 1076 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 1077 vap->va_mtime.tv_sec != VNOVAL || 1078 vap->va_birthtime.tv_sec != VNOVAL || 1079 vap->va_mode != (mode_t)VNOVAL) && 1080 (vp->v_mount->mnt_flag & MNT_RDONLY)) 1081 return (EROFS); 1082 if (vap->va_size != VNOVAL) { 1083 switch (vp->v_type) { 1084 case VDIR: 1085 return (EISDIR); 1086 case VCHR: 1087 case VBLK: 1088 case VSOCK: 1089 case VFIFO: 1090 if (vap->va_mtime.tv_sec == VNOVAL && 1091 vap->va_atime.tv_sec == VNOVAL && 1092 vap->va_birthtime.tv_sec == VNOVAL && 1093 vap->va_mode == (mode_t)VNOVAL && 1094 vap->va_uid == (uid_t)VNOVAL && 1095 vap->va_gid == (gid_t)VNOVAL) 1096 return (0); 1097 vap->va_size = VNOVAL; 1098 break; 1099 default: 1100 /* 1101 * Disallow write attempts if the filesystem is 1102 * mounted read-only. 1103 */ 1104 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1105 return (EROFS); 1106 /* 1107 * We run vnode_pager_setsize() early (why?), 1108 * we must set np->n_size now to avoid vinvalbuf 1109 * V_SAVE races that might setsize a lower 1110 * value. 1111 */ 1112 NFSLOCKNODE(np); 1113 tsize = np->n_size; 1114 NFSUNLOCKNODE(np); 1115 error = ncl_meta_setsize(vp, td, vap->va_size); 1116 NFSLOCKNODE(np); 1117 if (np->n_flag & NMODIFIED) { 1118 tsize = np->n_size; 1119 NFSUNLOCKNODE(np); 1120 error = ncl_vinvalbuf(vp, vap->va_size == 0 ? 1121 0 : V_SAVE, td, 1); 1122 if (error != 0) { 1123 vnode_pager_setsize(vp, tsize); 1124 return (error); 1125 } 1126 /* 1127 * Call nfscl_delegmodtime() to set the modify time 1128 * locally, as required. 1129 */ 1130 nfscl_delegmodtime(vp); 1131 } else 1132 NFSUNLOCKNODE(np); 1133 /* 1134 * np->n_size has already been set to vap->va_size 1135 * in ncl_meta_setsize(). We must set it again since 1136 * nfs_loadattrcache() could be called through 1137 * ncl_meta_setsize() and could modify np->n_size. 1138 */ 1139 NFSLOCKNODE(np); 1140 np->n_vattr.na_size = np->n_size = vap->va_size; 1141 NFSUNLOCKNODE(np); 1142 } 1143 } else { 1144 NFSLOCKNODE(np); 1145 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 1146 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 1147 NFSUNLOCKNODE(np); 1148 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 1149 if (error == EINTR || error == EIO) 1150 return (error); 1151 } else 1152 NFSUNLOCKNODE(np); 1153 } 1154 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 1155 if (vap->va_size != VNOVAL) { 1156 if (error == 0) { 1157 nanouptime(&ts); 1158 NFSLOCKNODE(np); 1159 np->n_localmodtime = ts; 1160 NFSUNLOCKNODE(np); 1161 } else { 1162 NFSLOCKNODE(np); 1163 np->n_size = np->n_vattr.na_size = tsize; 1164 vnode_pager_setsize(vp, tsize); 1165 NFSUNLOCKNODE(np); 1166 } 1167 } 1168 return (error); 1169 } 1170 1171 /* 1172 * Do an nfs setattr rpc. 1173 */ 1174 static int 1175 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 1176 struct thread *td) 1177 { 1178 struct nfsnode *np = VTONFS(vp); 1179 int error, ret, attrflag, i; 1180 struct nfsvattr nfsva; 1181 1182 if (NFS_ISV34(vp)) { 1183 NFSLOCKNODE(np); 1184 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) 1185 np->n_accesscache[i].stamp = 0; 1186 np->n_flag |= NDELEGMOD; 1187 NFSUNLOCKNODE(np); 1188 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); 1189 } 1190 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag); 1191 if (attrflag) { 1192 ret = nfscl_loadattrcache(&vp, &nfsva, 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 return (0); 1256 } 1257 1258 /* 1259 * We only accept a positive hit in the cache if the 1260 * change time of the file matches our cached copy. 1261 * Otherwise, we discard the cache entry and fallback 1262 * to doing a lookup RPC. We also only trust cache 1263 * entries for less than nm_nametimeo seconds. 1264 * 1265 * To better handle stale file handles and attributes, 1266 * clear the attribute cache of this node if it is a 1267 * leaf component, part of an open() call, and not 1268 * locally modified before fetching the attributes. 1269 * This should allow stale file handles to be detected 1270 * here where we can fall back to a LOOKUP RPC to 1271 * recover rather than having nfs_open() detect the 1272 * stale file handle and failing open(2) with ESTALE. 1273 */ 1274 newvp = *vpp; 1275 newnp = VTONFS(newvp); 1276 if (!(nmp->nm_flag & NFSMNT_NOCTO) && 1277 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1278 !(newnp->n_flag & NMODIFIED)) { 1279 NFSLOCKNODE(newnp); 1280 newnp->n_attrstamp = 0; 1281 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1282 NFSUNLOCKNODE(newnp); 1283 } 1284 if (nfscl_nodeleg(newvp, 0) == 0 || 1285 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) && 1286 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 && 1287 timespeccmp(&vattr.va_ctime, &nctime, ==))) { 1288 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1289 return (0); 1290 } 1291 cache_purge(newvp); 1292 if (dvp != newvp) 1293 vput(newvp); 1294 else 1295 vrele(newvp); 1296 *vpp = NULLVP; 1297 } else if (error == ENOENT) { 1298 if (VN_IS_DOOMED(dvp)) 1299 return (ENOENT); 1300 /* 1301 * We only accept a negative hit in the cache if the 1302 * modification time of the parent directory matches 1303 * the cached copy in the name cache entry. 1304 * Otherwise, we discard all of the negative cache 1305 * entries for this directory. We also only trust 1306 * negative cache entries for up to nm_negnametimeo 1307 * seconds. 1308 */ 1309 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) && 1310 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && 1311 timespeccmp(&vattr.va_mtime, &nctime, ==)) { 1312 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1313 return (ENOENT); 1314 } 1315 cache_purge_negative(dvp); 1316 } 1317 1318 openmode = 0; 1319 /* 1320 * If this an NFSv4.1/4.2 mount using the "oneopenown" mount 1321 * option, it is possible to do the Open operation in the same 1322 * compound as Lookup, so long as delegations are not being 1323 * issued. This saves doing a separate RPC for Open. 1324 * For pnfs, do not do this, since the Open+LayoutGet will 1325 * be needed as a separate RPC. 1326 */ 1327 NFSLOCKMNT(nmp); 1328 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp) && !NFSHASPNFS(nmp) && 1329 (nmp->nm_privflag & NFSMNTP_DELEGISSUED) == 0 && 1330 (!NFSMNT_RDONLY(mp) || (flags & OPENWRITE) == 0) && 1331 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN)) { 1332 if ((flags & OPENREAD) != 0) 1333 openmode |= NFSV4OPEN_ACCESSREAD; 1334 if ((flags & OPENWRITE) != 0) 1335 openmode |= NFSV4OPEN_ACCESSWRITE; 1336 } 1337 NFSUNLOCKMNT(nmp); 1338 1339 newvp = NULLVP; 1340 NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses); 1341 nanouptime(&ts); 1342 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1343 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1344 openmode); 1345 if (dattrflag) 1346 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 1347 if (error) { 1348 if (newvp != NULLVP) { 1349 vput(newvp); 1350 *vpp = NULLVP; 1351 } 1352 1353 if (error != ENOENT) { 1354 if (NFS_ISV4(dvp)) 1355 error = nfscl_maperr(td, error, (uid_t)0, 1356 (gid_t)0); 1357 return (error); 1358 } 1359 1360 /* The requested file was not found. */ 1361 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1362 (flags & ISLASTCN)) { 1363 /* 1364 * XXX: UFS does a full VOP_ACCESS(dvp, 1365 * VWRITE) here instead of just checking 1366 * MNT_RDONLY. 1367 */ 1368 if (mp->mnt_flag & MNT_RDONLY) 1369 return (EROFS); 1370 return (EJUSTRETURN); 1371 } 1372 1373 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) { 1374 /* 1375 * Cache the modification time of the parent 1376 * directory from the post-op attributes in 1377 * the name cache entry. The negative cache 1378 * entry will be ignored once the directory 1379 * has changed. Don't bother adding the entry 1380 * if the directory has already changed. 1381 */ 1382 NFSLOCKNODE(np); 1383 if (timespeccmp(&np->n_vattr.na_mtime, 1384 &dnfsva.na_mtime, ==)) { 1385 NFSUNLOCKNODE(np); 1386 cache_enter_time(dvp, NULL, cnp, 1387 &dnfsva.na_mtime, NULL); 1388 } else 1389 NFSUNLOCKNODE(np); 1390 } 1391 return (ENOENT); 1392 } 1393 1394 /* 1395 * Handle RENAME case... 1396 */ 1397 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 1398 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1399 free(nfhp, M_NFSFH); 1400 return (EISDIR); 1401 } 1402 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, LK_EXCLUSIVE); 1403 if (error) 1404 return (error); 1405 newvp = NFSTOV(np); 1406 /* 1407 * If n_localmodtime >= time before RPC, then 1408 * a file modification operation, such as 1409 * VOP_SETATTR() of size, has occurred while 1410 * the Lookup RPC and acquisition of the vnode 1411 * happened. As such, the attributes might 1412 * be stale, with possibly an incorrect size. 1413 */ 1414 NFSLOCKNODE(np); 1415 if (timespecisset(&np->n_localmodtime) && 1416 timespeccmp(&np->n_localmodtime, &ts, >=)) { 1417 NFSCL_DEBUG(4, "nfs_lookup: rename localmod " 1418 "stale attributes\n"); 1419 attrflag = 0; 1420 } 1421 NFSUNLOCKNODE(np); 1422 if (attrflag) 1423 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1424 *vpp = newvp; 1425 return (0); 1426 } 1427 1428 if (flags & ISDOTDOT) { 1429 ltype = NFSVOPISLOCKED(dvp); 1430 error = vfs_busy(mp, MBF_NOWAIT); 1431 if (error != 0) { 1432 vfs_ref(mp); 1433 NFSVOPUNLOCK(dvp); 1434 error = vfs_busy(mp, 0); 1435 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1436 vfs_rel(mp); 1437 if (error == 0 && VN_IS_DOOMED(dvp)) { 1438 vfs_unbusy(mp); 1439 error = ENOENT; 1440 } 1441 if (error != 0) 1442 return (error); 1443 } 1444 NFSVOPUNLOCK(dvp); 1445 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, 1446 cnp->cn_lkflags); 1447 if (error == 0) 1448 newvp = NFSTOV(np); 1449 vfs_unbusy(mp); 1450 if (newvp != dvp) 1451 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1452 if (VN_IS_DOOMED(dvp)) { 1453 if (error == 0) { 1454 if (newvp == dvp) 1455 vrele(newvp); 1456 else 1457 vput(newvp); 1458 } 1459 error = ENOENT; 1460 } 1461 if (error != 0) 1462 return (error); 1463 if (attrflag) 1464 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1465 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1466 free(nfhp, M_NFSFH); 1467 VREF(dvp); 1468 newvp = dvp; 1469 if (attrflag) 1470 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1471 } else { 1472 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, 1473 cnp->cn_lkflags); 1474 if (error) 1475 return (error); 1476 newvp = NFSTOV(np); 1477 /* 1478 * If n_localmodtime >= time before RPC, then 1479 * a file modification operation, such as 1480 * VOP_SETATTR() of size, has occurred while 1481 * the Lookup RPC and acquisition of the vnode 1482 * happened. As such, the attributes might 1483 * be stale, with possibly an incorrect size. 1484 */ 1485 NFSLOCKNODE(np); 1486 if (timespecisset(&np->n_localmodtime) && 1487 timespeccmp(&np->n_localmodtime, &ts, >=)) { 1488 NFSCL_DEBUG(4, "nfs_lookup: localmod " 1489 "stale attributes\n"); 1490 attrflag = 0; 1491 } 1492 NFSUNLOCKNODE(np); 1493 if (attrflag) 1494 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1495 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1496 !(np->n_flag & NMODIFIED)) { 1497 /* 1498 * Flush the attribute cache when opening a 1499 * leaf node to ensure that fresh attributes 1500 * are fetched in nfs_open() since we did not 1501 * fetch attributes from the LOOKUP reply. 1502 */ 1503 NFSLOCKNODE(np); 1504 np->n_attrstamp = 0; 1505 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1506 NFSUNLOCKNODE(np); 1507 } 1508 } 1509 if ((cnp->cn_flags & MAKEENTRY) && dvp != newvp && 1510 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) && 1511 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0)) 1512 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 1513 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime); 1514 *vpp = newvp; 1515 return (0); 1516 } 1517 1518 /* 1519 * nfs read call. 1520 * Just call ncl_bioread() to do the work. 1521 */ 1522 static int 1523 nfs_read(struct vop_read_args *ap) 1524 { 1525 struct vnode *vp = ap->a_vp; 1526 1527 switch (vp->v_type) { 1528 case VREG: 1529 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1530 case VDIR: 1531 return (EISDIR); 1532 default: 1533 return (EOPNOTSUPP); 1534 } 1535 } 1536 1537 /* 1538 * nfs readlink call 1539 */ 1540 static int 1541 nfs_readlink(struct vop_readlink_args *ap) 1542 { 1543 struct vnode *vp = ap->a_vp; 1544 1545 if (vp->v_type != VLNK) 1546 return (EINVAL); 1547 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1548 } 1549 1550 /* 1551 * Do a readlink rpc. 1552 * Called by ncl_doio() from below the buffer cache. 1553 */ 1554 int 1555 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1556 { 1557 int error, ret, attrflag; 1558 struct nfsvattr nfsva; 1559 1560 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva, 1561 &attrflag); 1562 if (attrflag) { 1563 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 1564 if (ret && !error) 1565 error = ret; 1566 } 1567 if (error && NFS_ISV4(vp)) 1568 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1569 return (error); 1570 } 1571 1572 /* 1573 * nfs read rpc call 1574 * Ditto above 1575 */ 1576 int 1577 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1578 { 1579 int error, ret, attrflag; 1580 struct nfsvattr nfsva; 1581 struct nfsmount *nmp; 1582 1583 nmp = VFSTONFS(vp->v_mount); 1584 error = EIO; 1585 attrflag = 0; 1586 if (NFSHASPNFS(nmp)) 1587 error = nfscl_doiods(vp, uiop, NULL, NULL, 1588 NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td); 1589 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error); 1590 if (error != 0) 1591 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, 1592 &attrflag); 1593 if (attrflag) { 1594 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 1595 if (ret && !error) 1596 error = ret; 1597 } 1598 if (error && NFS_ISV4(vp)) 1599 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1600 return (error); 1601 } 1602 1603 /* 1604 * nfs write call 1605 */ 1606 int 1607 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1608 int *iomode, int *must_commit, int called_from_strategy, int ioflag) 1609 { 1610 struct nfsvattr nfsva; 1611 int error, attrflag, ret; 1612 struct nfsmount *nmp; 1613 1614 nmp = VFSTONFS(vp->v_mount); 1615 error = EIO; 1616 attrflag = 0; 1617 if (NFSHASPNFS(nmp)) 1618 error = nfscl_doiods(vp, uiop, iomode, must_commit, 1619 NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td); 1620 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error); 1621 if (error != 0) 1622 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred, 1623 uiop->uio_td, &nfsva, &attrflag, called_from_strategy, 1624 ioflag); 1625 if (attrflag) { 1626 if (VTONFS(vp)->n_flag & ND_NFSV4) 1627 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 1, 1); 1628 else 1629 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 1630 if (ret && !error) 1631 error = ret; 1632 } 1633 if (DOINGASYNC(vp)) 1634 *iomode = NFSWRITE_FILESYNC; 1635 if (error && NFS_ISV4(vp)) 1636 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1637 return (error); 1638 } 1639 1640 /* 1641 * nfs mknod rpc 1642 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1643 * mode set to specify the file type and the size field for rdev. 1644 */ 1645 static int 1646 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1647 struct vattr *vap) 1648 { 1649 struct nfsvattr nfsva, dnfsva; 1650 struct vnode *newvp = NULL; 1651 struct nfsnode *np = NULL, *dnp; 1652 struct nfsfh *nfhp; 1653 struct vattr vattr; 1654 int error = 0, attrflag, dattrflag; 1655 u_int32_t rdev; 1656 1657 if (vap->va_type == VCHR || vap->va_type == VBLK) 1658 rdev = vap->va_rdev; 1659 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1660 rdev = 0xffffffff; 1661 else 1662 return (EOPNOTSUPP); 1663 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1664 return (error); 1665 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap, 1666 rdev, vap->va_type, cnp->cn_cred, curthread, &dnfsva, 1667 &nfsva, &nfhp, &attrflag, &dattrflag); 1668 if (!error) { 1669 if (!nfhp) 1670 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1671 cnp->cn_namelen, cnp->cn_cred, curthread, 1672 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 0); 1673 if (nfhp) 1674 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1675 curthread, &np, LK_EXCLUSIVE); 1676 } 1677 if (dattrflag) 1678 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 1679 if (!error) { 1680 newvp = NFSTOV(np); 1681 if (attrflag != 0) { 1682 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1683 if (error != 0) 1684 vput(newvp); 1685 } 1686 } 1687 if (!error) { 1688 *vpp = newvp; 1689 } else if (NFS_ISV4(dvp)) { 1690 error = nfscl_maperr(curthread, error, vap->va_uid, 1691 vap->va_gid); 1692 } 1693 dnp = VTONFS(dvp); 1694 NFSLOCKNODE(dnp); 1695 dnp->n_flag |= NMODIFIED; 1696 if (!dattrflag) { 1697 dnp->n_attrstamp = 0; 1698 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1699 } 1700 NFSUNLOCKNODE(dnp); 1701 return (error); 1702 } 1703 1704 /* 1705 * nfs mknod vop 1706 * just call nfs_mknodrpc() to do the work. 1707 */ 1708 /* ARGSUSED */ 1709 static int 1710 nfs_mknod(struct vop_mknod_args *ap) 1711 { 1712 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1713 } 1714 1715 static struct mtx nfs_cverf_mtx; 1716 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex", 1717 MTX_DEF); 1718 1719 static nfsquad_t 1720 nfs_get_cverf(void) 1721 { 1722 static nfsquad_t cverf; 1723 nfsquad_t ret; 1724 static int cverf_initialized = 0; 1725 1726 mtx_lock(&nfs_cverf_mtx); 1727 if (cverf_initialized == 0) { 1728 cverf.lval[0] = arc4random(); 1729 cverf.lval[1] = arc4random(); 1730 cverf_initialized = 1; 1731 } else 1732 cverf.qval++; 1733 ret = cverf; 1734 mtx_unlock(&nfs_cverf_mtx); 1735 1736 return (ret); 1737 } 1738 1739 /* 1740 * nfs file create call 1741 */ 1742 static int 1743 nfs_create(struct vop_create_args *ap) 1744 { 1745 struct vnode *dvp = ap->a_dvp; 1746 struct vattr *vap = ap->a_vap; 1747 struct componentname *cnp = ap->a_cnp; 1748 struct nfsnode *np = NULL, *dnp; 1749 struct vnode *newvp = NULL; 1750 struct nfsmount *nmp; 1751 struct nfsvattr dnfsva, nfsva; 1752 struct nfsfh *nfhp; 1753 nfsquad_t cverf; 1754 int error = 0, attrflag, dattrflag, fmode = 0; 1755 struct vattr vattr; 1756 1757 /* 1758 * Oops, not for me.. 1759 */ 1760 if (vap->va_type == VSOCK) 1761 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1762 1763 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1764 return (error); 1765 if (vap->va_vaflags & VA_EXCLUSIVE) 1766 fmode |= O_EXCL; 1767 dnp = VTONFS(dvp); 1768 nmp = VFSTONFS(dvp->v_mount); 1769 again: 1770 /* For NFSv4, wait until any remove is done. */ 1771 NFSLOCKNODE(dnp); 1772 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) { 1773 dnp->n_flag |= NREMOVEWANT; 1774 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0); 1775 } 1776 NFSUNLOCKNODE(dnp); 1777 1778 cverf = nfs_get_cverf(); 1779 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1780 vap, cverf, fmode, cnp->cn_cred, curthread, &dnfsva, &nfsva, 1781 &nfhp, &attrflag, &dattrflag); 1782 if (!error) { 1783 if (nfhp == NULL) 1784 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1785 cnp->cn_namelen, cnp->cn_cred, curthread, 1786 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 0); 1787 if (nfhp != NULL) 1788 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1789 curthread, &np, LK_EXCLUSIVE); 1790 } 1791 if (dattrflag) 1792 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 1793 if (!error) { 1794 newvp = NFSTOV(np); 1795 if (attrflag == 0) 1796 error = nfsrpc_getattr(newvp, cnp->cn_cred, curthread, 1797 &nfsva); 1798 if (error == 0) 1799 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1800 } 1801 if (error) { 1802 if (newvp != NULL) { 1803 vput(newvp); 1804 newvp = NULL; 1805 } 1806 if (NFS_ISV34(dvp) && (fmode & O_EXCL) && 1807 error == NFSERR_NOTSUPP) { 1808 fmode &= ~O_EXCL; 1809 goto again; 1810 } 1811 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) { 1812 if (nfscl_checksattr(vap, &nfsva)) { 1813 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred, 1814 curthread, &nfsva, &attrflag); 1815 if (error && (vap->va_uid != (uid_t)VNOVAL || 1816 vap->va_gid != (gid_t)VNOVAL)) { 1817 /* try again without setting uid/gid */ 1818 vap->va_uid = (uid_t)VNOVAL; 1819 vap->va_gid = (uid_t)VNOVAL; 1820 error = nfsrpc_setattr(newvp, vap, NULL, 1821 cnp->cn_cred, curthread, &nfsva, &attrflag); 1822 } 1823 if (attrflag) 1824 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 1825 0, 1); 1826 if (error != 0) 1827 vput(newvp); 1828 } 1829 } 1830 if (!error) { 1831 if ((cnp->cn_flags & MAKEENTRY) && attrflag) { 1832 if (dvp != newvp) 1833 cache_enter_time(dvp, newvp, cnp, 1834 &nfsva.na_ctime, NULL); 1835 else 1836 printf("nfs_create: bogus NFS server returned " 1837 "the directory as the new file object\n"); 1838 } 1839 *ap->a_vpp = newvp; 1840 } else if (NFS_ISV4(dvp)) { 1841 error = nfscl_maperr(curthread, error, vap->va_uid, 1842 vap->va_gid); 1843 } 1844 NFSLOCKNODE(dnp); 1845 dnp->n_flag |= NMODIFIED; 1846 if (!dattrflag) { 1847 dnp->n_attrstamp = 0; 1848 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1849 } 1850 NFSUNLOCKNODE(dnp); 1851 return (error); 1852 } 1853 1854 /* 1855 * nfs file remove call 1856 * To try and make nfs semantics closer to ufs semantics, a file that has 1857 * other processes using the vnode is renamed instead of removed and then 1858 * removed later on the last close. 1859 * - If v_usecount > 1 1860 * If a rename is not already in the works 1861 * call nfs_sillyrename() to set it up 1862 * else 1863 * do the remove rpc 1864 */ 1865 static int 1866 nfs_remove(struct vop_remove_args *ap) 1867 { 1868 struct vnode *vp = ap->a_vp; 1869 struct vnode *dvp = ap->a_dvp; 1870 struct componentname *cnp = ap->a_cnp; 1871 struct nfsnode *np = VTONFS(vp); 1872 int error = 0; 1873 struct vattr vattr; 1874 1875 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount")); 1876 if (vp->v_type == VDIR) 1877 error = EPERM; 1878 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1879 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1880 vattr.va_nlink > 1)) { 1881 /* 1882 * Purge the name cache so that the chance of a lookup for 1883 * the name succeeding while the remove is in progress is 1884 * minimized. Without node locking it can still happen, such 1885 * that an I/O op returns ESTALE, but since you get this if 1886 * another host removes the file.. 1887 */ 1888 cache_purge(vp); 1889 /* 1890 * throw away biocache buffers, mainly to avoid 1891 * unnecessary delayed writes later. 1892 */ 1893 error = ncl_vinvalbuf(vp, 0, curthread, 1); 1894 if (error != EINTR && error != EIO) 1895 /* Do the rpc */ 1896 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr, 1897 cnp->cn_namelen, cnp->cn_cred, curthread); 1898 /* 1899 * Kludge City: If the first reply to the remove rpc is lost.. 1900 * the reply to the retransmitted request will be ENOENT 1901 * since the file was in fact removed 1902 * Therefore, we cheat and return success. 1903 */ 1904 if (error == ENOENT) 1905 error = 0; 1906 } else if (!np->n_sillyrename) 1907 error = nfs_sillyrename(dvp, vp, cnp); 1908 NFSLOCKNODE(np); 1909 np->n_attrstamp = 0; 1910 NFSUNLOCKNODE(np); 1911 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1912 return (error); 1913 } 1914 1915 /* 1916 * nfs file remove rpc called from nfs_inactive 1917 */ 1918 int 1919 ncl_removeit(struct sillyrename *sp, struct vnode *vp) 1920 { 1921 /* 1922 * Make sure that the directory vnode is still valid. 1923 * XXX we should lock sp->s_dvp here. 1924 */ 1925 if (sp->s_dvp->v_type == VBAD) 1926 return (0); 1927 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen, 1928 sp->s_cred, NULL)); 1929 } 1930 1931 /* 1932 * Nfs remove rpc, called from nfs_remove() and ncl_removeit(). 1933 */ 1934 static int 1935 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 1936 int namelen, struct ucred *cred, struct thread *td) 1937 { 1938 struct nfsvattr dnfsva; 1939 struct nfsnode *dnp = VTONFS(dvp); 1940 int error = 0, dattrflag; 1941 1942 NFSLOCKNODE(dnp); 1943 dnp->n_flag |= NREMOVEINPROG; 1944 NFSUNLOCKNODE(dnp); 1945 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva, 1946 &dattrflag); 1947 NFSLOCKNODE(dnp); 1948 if ((dnp->n_flag & NREMOVEWANT)) { 1949 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG); 1950 NFSUNLOCKNODE(dnp); 1951 wakeup((caddr_t)dnp); 1952 } else { 1953 dnp->n_flag &= ~NREMOVEINPROG; 1954 NFSUNLOCKNODE(dnp); 1955 } 1956 if (dattrflag) 1957 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 1958 NFSLOCKNODE(dnp); 1959 dnp->n_flag |= NMODIFIED; 1960 if (!dattrflag) { 1961 dnp->n_attrstamp = 0; 1962 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1963 } 1964 NFSUNLOCKNODE(dnp); 1965 if (error && NFS_ISV4(dvp)) 1966 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1967 return (error); 1968 } 1969 1970 /* 1971 * nfs file rename call 1972 */ 1973 static int 1974 nfs_rename(struct vop_rename_args *ap) 1975 { 1976 struct vnode *fvp = ap->a_fvp; 1977 struct vnode *tvp = ap->a_tvp; 1978 struct vnode *fdvp = ap->a_fdvp; 1979 struct vnode *tdvp = ap->a_tdvp; 1980 struct componentname *tcnp = ap->a_tcnp; 1981 struct componentname *fcnp = ap->a_fcnp; 1982 struct nfsnode *fnp = VTONFS(ap->a_fvp); 1983 struct nfsnode *tdnp = VTONFS(ap->a_tdvp); 1984 struct nfsv4node *newv4 = NULL; 1985 int error; 1986 1987 /* Check for cross-device rename */ 1988 if ((fvp->v_mount != tdvp->v_mount) || 1989 (tvp && (fvp->v_mount != tvp->v_mount))) { 1990 error = EXDEV; 1991 goto out; 1992 } 1993 1994 if (fvp == tvp) { 1995 printf("nfs_rename: fvp == tvp (can't happen)\n"); 1996 error = 0; 1997 goto out; 1998 } 1999 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0) 2000 goto out; 2001 2002 /* 2003 * We have to flush B_DELWRI data prior to renaming 2004 * the file. If we don't, the delayed-write buffers 2005 * can be flushed out later after the file has gone stale 2006 * under NFSV3. NFSV2 does not have this problem because 2007 * ( as far as I can tell ) it flushes dirty buffers more 2008 * often. 2009 * 2010 * Skip the rename operation if the fsync fails, this can happen 2011 * due to the server's volume being full, when we pushed out data 2012 * that was written back to our cache earlier. Not checking for 2013 * this condition can result in potential (silent) data loss. 2014 */ 2015 error = VOP_FSYNC(fvp, MNT_WAIT, curthread); 2016 NFSVOPUNLOCK(fvp); 2017 if (!error && tvp) 2018 error = VOP_FSYNC(tvp, MNT_WAIT, curthread); 2019 if (error) 2020 goto out; 2021 2022 /* 2023 * If the tvp exists and is in use, sillyrename it before doing the 2024 * rename of the new file over it. 2025 * XXX Can't sillyrename a directory. 2026 */ 2027 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 2028 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 2029 vput(tvp); 2030 tvp = NULL; 2031 } 2032 2033 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen, 2034 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 2035 curthread); 2036 2037 if (error == 0 && NFS_ISV4(tdvp)) { 2038 /* 2039 * For NFSv4, check to see if it is the same name and 2040 * replace the name, if it is different. 2041 */ 2042 newv4 = malloc( 2043 sizeof (struct nfsv4node) + 2044 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1, 2045 M_NFSV4NODE, M_WAITOK); 2046 NFSLOCKNODE(tdnp); 2047 NFSLOCKNODE(fnp); 2048 if (fnp->n_v4 != NULL && fvp->v_type == VREG && 2049 (fnp->n_v4->n4_namelen != tcnp->cn_namelen || 2050 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4), 2051 tcnp->cn_namelen) || 2052 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen || 2053 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 2054 tdnp->n_fhp->nfh_len))) { 2055 #ifdef notdef 2056 { char nnn[100]; int nnnl; 2057 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99; 2058 bcopy(tcnp->cn_nameptr, nnn, nnnl); 2059 nnn[nnnl] = '\0'; 2060 printf("ren replace=%s\n",nnn); 2061 } 2062 #endif 2063 free(fnp->n_v4, M_NFSV4NODE); 2064 fnp->n_v4 = newv4; 2065 newv4 = NULL; 2066 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len; 2067 fnp->n_v4->n4_namelen = tcnp->cn_namelen; 2068 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 2069 tdnp->n_fhp->nfh_len); 2070 NFSBCOPY(tcnp->cn_nameptr, 2071 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen); 2072 } 2073 NFSUNLOCKNODE(tdnp); 2074 NFSUNLOCKNODE(fnp); 2075 if (newv4 != NULL) 2076 free(newv4, M_NFSV4NODE); 2077 } 2078 2079 if (fvp->v_type == VDIR) { 2080 if (tvp != NULL && tvp->v_type == VDIR) 2081 cache_purge(tdvp); 2082 cache_purge(fdvp); 2083 } 2084 2085 out: 2086 if (tdvp == tvp) 2087 vrele(tdvp); 2088 else 2089 vput(tdvp); 2090 if (tvp) 2091 vput(tvp); 2092 vrele(fdvp); 2093 vrele(fvp); 2094 /* 2095 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 2096 */ 2097 if (error == ENOENT) 2098 error = 0; 2099 return (error); 2100 } 2101 2102 /* 2103 * nfs file rename rpc called from nfs_remove() above 2104 */ 2105 static int 2106 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp, 2107 struct sillyrename *sp) 2108 { 2109 2110 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen, 2111 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred, 2112 curthread)); 2113 } 2114 2115 /* 2116 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 2117 */ 2118 static int 2119 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr, 2120 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr, 2121 int tnamelen, struct ucred *cred, struct thread *td) 2122 { 2123 struct nfsvattr fnfsva, tnfsva; 2124 struct nfsnode *fdnp = VTONFS(fdvp); 2125 struct nfsnode *tdnp = VTONFS(tdvp); 2126 int error = 0, fattrflag, tattrflag; 2127 2128 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp, 2129 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag, 2130 &tattrflag); 2131 NFSLOCKNODE(fdnp); 2132 fdnp->n_flag |= NMODIFIED; 2133 if (fattrflag != 0) { 2134 NFSUNLOCKNODE(fdnp); 2135 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, 0, 1); 2136 } else { 2137 fdnp->n_attrstamp = 0; 2138 NFSUNLOCKNODE(fdnp); 2139 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 2140 } 2141 NFSLOCKNODE(tdnp); 2142 tdnp->n_flag |= NMODIFIED; 2143 if (tattrflag != 0) { 2144 NFSUNLOCKNODE(tdnp); 2145 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, 0, 1); 2146 } else { 2147 tdnp->n_attrstamp = 0; 2148 NFSUNLOCKNODE(tdnp); 2149 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2150 } 2151 if (error && NFS_ISV4(fdvp)) 2152 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2153 return (error); 2154 } 2155 2156 /* 2157 * nfs hard link create call 2158 */ 2159 static int 2160 nfs_link(struct vop_link_args *ap) 2161 { 2162 struct vnode *vp = ap->a_vp; 2163 struct vnode *tdvp = ap->a_tdvp; 2164 struct componentname *cnp = ap->a_cnp; 2165 struct nfsnode *np, *tdnp; 2166 struct nfsvattr nfsva, dnfsva; 2167 int error = 0, attrflag, dattrflag; 2168 2169 /* 2170 * Push all writes to the server, so that the attribute cache 2171 * doesn't get "out of sync" with the server. 2172 * XXX There should be a better way! 2173 */ 2174 VOP_FSYNC(vp, MNT_WAIT, curthread); 2175 2176 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 2177 cnp->cn_cred, curthread, &dnfsva, &nfsva, &attrflag, &dattrflag); 2178 tdnp = VTONFS(tdvp); 2179 NFSLOCKNODE(tdnp); 2180 tdnp->n_flag |= NMODIFIED; 2181 if (dattrflag != 0) { 2182 NFSUNLOCKNODE(tdnp); 2183 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, 0, 1); 2184 } else { 2185 tdnp->n_attrstamp = 0; 2186 NFSUNLOCKNODE(tdnp); 2187 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2188 } 2189 if (attrflag) 2190 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 2191 else { 2192 np = VTONFS(vp); 2193 NFSLOCKNODE(np); 2194 np->n_attrstamp = 0; 2195 NFSUNLOCKNODE(np); 2196 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 2197 } 2198 /* 2199 * If negative lookup caching is enabled, I might as well 2200 * add an entry for this node. Not necessary for correctness, 2201 * but if negative caching is enabled, then the system 2202 * must care about lookup caching hit rate, so... 2203 */ 2204 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 && 2205 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2206 if (tdvp != vp) 2207 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL); 2208 else 2209 printf("nfs_link: bogus NFS server returned " 2210 "the directory as the new link\n"); 2211 } 2212 if (error && NFS_ISV4(vp)) 2213 error = nfscl_maperr(curthread, error, (uid_t)0, 2214 (gid_t)0); 2215 return (error); 2216 } 2217 2218 /* 2219 * nfs symbolic link create call 2220 */ 2221 static int 2222 nfs_symlink(struct vop_symlink_args *ap) 2223 { 2224 struct vnode *dvp = ap->a_dvp; 2225 struct vattr *vap = ap->a_vap; 2226 struct componentname *cnp = ap->a_cnp; 2227 struct nfsvattr nfsva, dnfsva; 2228 struct nfsfh *nfhp; 2229 struct nfsnode *np = NULL, *dnp; 2230 struct vnode *newvp = NULL; 2231 int error = 0, attrflag, dattrflag, ret; 2232 2233 vap->va_type = VLNK; 2234 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2235 ap->a_target, vap, cnp->cn_cred, curthread, &dnfsva, 2236 &nfsva, &nfhp, &attrflag, &dattrflag); 2237 if (nfhp) { 2238 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread, 2239 &np, LK_EXCLUSIVE); 2240 if (!ret) 2241 newvp = NFSTOV(np); 2242 else if (!error) 2243 error = ret; 2244 } 2245 if (newvp != NULL) { 2246 if (attrflag) 2247 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 2248 } else if (!error) { 2249 /* 2250 * If we do not have an error and we could not extract the 2251 * newvp from the response due to the request being NFSv2, we 2252 * have to do a lookup in order to obtain a newvp to return. 2253 */ 2254 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2255 cnp->cn_cred, curthread, &np); 2256 if (!error) 2257 newvp = NFSTOV(np); 2258 } 2259 if (error) { 2260 if (newvp) 2261 vput(newvp); 2262 if (NFS_ISV4(dvp)) 2263 error = nfscl_maperr(curthread, error, 2264 vap->va_uid, vap->va_gid); 2265 } else { 2266 *ap->a_vpp = newvp; 2267 } 2268 2269 dnp = VTONFS(dvp); 2270 NFSLOCKNODE(dnp); 2271 dnp->n_flag |= NMODIFIED; 2272 if (dattrflag != 0) { 2273 NFSUNLOCKNODE(dnp); 2274 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 2275 } else { 2276 dnp->n_attrstamp = 0; 2277 NFSUNLOCKNODE(dnp); 2278 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2279 } 2280 /* 2281 * If negative lookup caching is enabled, I might as well 2282 * add an entry for this node. Not necessary for correctness, 2283 * but if negative caching is enabled, then the system 2284 * must care about lookup caching hit rate, so... 2285 */ 2286 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2287 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2288 if (dvp != newvp) 2289 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 2290 NULL); 2291 else 2292 printf("nfs_symlink: bogus NFS server returned " 2293 "the directory as the new file object\n"); 2294 } 2295 return (error); 2296 } 2297 2298 /* 2299 * nfs make dir call 2300 */ 2301 static int 2302 nfs_mkdir(struct vop_mkdir_args *ap) 2303 { 2304 struct vnode *dvp = ap->a_dvp; 2305 struct vattr *vap = ap->a_vap; 2306 struct componentname *cnp = ap->a_cnp; 2307 struct nfsnode *np = NULL, *dnp; 2308 struct vnode *newvp = NULL; 2309 struct vattr vattr; 2310 struct nfsfh *nfhp; 2311 struct nfsvattr nfsva, dnfsva; 2312 int error = 0, attrflag, dattrflag, ret; 2313 2314 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2315 return (error); 2316 vap->va_type = VDIR; 2317 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2318 vap, cnp->cn_cred, curthread, &dnfsva, &nfsva, &nfhp, 2319 &attrflag, &dattrflag); 2320 dnp = VTONFS(dvp); 2321 NFSLOCKNODE(dnp); 2322 dnp->n_flag |= NMODIFIED; 2323 if (dattrflag != 0) { 2324 NFSUNLOCKNODE(dnp); 2325 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 2326 } else { 2327 dnp->n_attrstamp = 0; 2328 NFSUNLOCKNODE(dnp); 2329 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2330 } 2331 if (nfhp) { 2332 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread, 2333 &np, LK_EXCLUSIVE); 2334 if (!ret) { 2335 newvp = NFSTOV(np); 2336 if (attrflag) 2337 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 2338 0, 1); 2339 } else if (!error) 2340 error = ret; 2341 } 2342 if (!error && newvp == NULL) { 2343 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2344 cnp->cn_cred, curthread, &np); 2345 if (!error) { 2346 newvp = NFSTOV(np); 2347 if (newvp->v_type != VDIR) 2348 error = EEXIST; 2349 } 2350 } 2351 if (error) { 2352 if (newvp) 2353 vput(newvp); 2354 if (NFS_ISV4(dvp)) 2355 error = nfscl_maperr(curthread, error, 2356 vap->va_uid, vap->va_gid); 2357 } else { 2358 /* 2359 * If negative lookup caching is enabled, I might as well 2360 * add an entry for this node. Not necessary for correctness, 2361 * but if negative caching is enabled, then the system 2362 * must care about lookup caching hit rate, so... 2363 */ 2364 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2365 (cnp->cn_flags & MAKEENTRY) && 2366 attrflag != 0 && dattrflag != 0) { 2367 if (dvp != newvp) 2368 cache_enter_time(dvp, newvp, cnp, 2369 &nfsva.na_ctime, &dnfsva.na_ctime); 2370 else 2371 printf("nfs_mkdir: bogus NFS server returned " 2372 "the directory that the directory was " 2373 "created in as the new file object\n"); 2374 } 2375 *ap->a_vpp = newvp; 2376 } 2377 return (error); 2378 } 2379 2380 /* 2381 * nfs remove directory call 2382 */ 2383 static int 2384 nfs_rmdir(struct vop_rmdir_args *ap) 2385 { 2386 struct vnode *vp = ap->a_vp; 2387 struct vnode *dvp = ap->a_dvp; 2388 struct componentname *cnp = ap->a_cnp; 2389 struct nfsnode *dnp; 2390 struct nfsvattr dnfsva; 2391 int error, dattrflag; 2392 2393 if (dvp == vp) 2394 return (EINVAL); 2395 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2396 cnp->cn_cred, curthread, &dnfsva, &dattrflag); 2397 dnp = VTONFS(dvp); 2398 NFSLOCKNODE(dnp); 2399 dnp->n_flag |= NMODIFIED; 2400 if (dattrflag != 0) { 2401 NFSUNLOCKNODE(dnp); 2402 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 2403 } else { 2404 dnp->n_attrstamp = 0; 2405 NFSUNLOCKNODE(dnp); 2406 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2407 } 2408 2409 cache_purge(dvp); 2410 cache_purge(vp); 2411 if (error && NFS_ISV4(dvp)) 2412 error = nfscl_maperr(curthread, error, (uid_t)0, 2413 (gid_t)0); 2414 /* 2415 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2416 */ 2417 if (error == ENOENT) 2418 error = 0; 2419 return (error); 2420 } 2421 2422 /* 2423 * nfs readdir call 2424 */ 2425 static int 2426 nfs_readdir(struct vop_readdir_args *ap) 2427 { 2428 struct vnode *vp = ap->a_vp; 2429 struct nfsnode *np = VTONFS(vp); 2430 struct uio *uio = ap->a_uio; 2431 ssize_t tresid, left; 2432 int error = 0; 2433 struct vattr vattr; 2434 2435 if (ap->a_eofflag != NULL) 2436 *ap->a_eofflag = 0; 2437 if (vp->v_type != VDIR) 2438 return(EPERM); 2439 2440 /* 2441 * First, check for hit on the EOF offset cache 2442 */ 2443 NFSLOCKNODE(np); 2444 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2445 (np->n_flag & NMODIFIED) == 0) { 2446 NFSUNLOCKNODE(np); 2447 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2448 NFSLOCKNODE(np); 2449 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) || 2450 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2451 NFSUNLOCKNODE(np); 2452 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits); 2453 if (ap->a_eofflag != NULL) 2454 *ap->a_eofflag = 1; 2455 return (0); 2456 } else 2457 NFSUNLOCKNODE(np); 2458 } 2459 } else 2460 NFSUNLOCKNODE(np); 2461 2462 /* 2463 * NFS always guarantees that directory entries don't straddle 2464 * DIRBLKSIZ boundaries. As such, we need to limit the size 2465 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial 2466 * directory entry. 2467 */ 2468 left = uio->uio_resid % DIRBLKSIZ; 2469 if (left == uio->uio_resid) 2470 return (EINVAL); 2471 uio->uio_resid -= left; 2472 2473 /* 2474 * Call ncl_bioread() to do the real work. 2475 */ 2476 tresid = uio->uio_resid; 2477 error = ncl_bioread(vp, uio, 0, ap->a_cred); 2478 2479 if (!error && uio->uio_resid == tresid) { 2480 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses); 2481 if (ap->a_eofflag != NULL) 2482 *ap->a_eofflag = 1; 2483 } 2484 2485 /* Add the partial DIRBLKSIZ (left) back in. */ 2486 uio->uio_resid += left; 2487 return (error); 2488 } 2489 2490 /* 2491 * Readdir rpc call. 2492 * Called from below the buffer cache by ncl_doio(). 2493 */ 2494 int 2495 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2496 struct thread *td) 2497 { 2498 struct nfsvattr nfsva; 2499 nfsuint64 *cookiep, cookie; 2500 struct nfsnode *dnp = VTONFS(vp); 2501 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2502 int error = 0, eof, attrflag; 2503 2504 KASSERT(uiop->uio_iovcnt == 1 && 2505 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2506 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2507 ("nfs readdirrpc bad uio")); 2508 2509 /* 2510 * If there is no cookie, assume directory was stale. 2511 */ 2512 ncl_dircookie_lock(dnp); 2513 NFSUNLOCKNODE(dnp); 2514 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2515 if (cookiep) { 2516 cookie = *cookiep; 2517 ncl_dircookie_unlock(dnp); 2518 } else { 2519 ncl_dircookie_unlock(dnp); 2520 return (NFSERR_BAD_COOKIE); 2521 } 2522 2523 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2524 (void)ncl_fsinfo(nmp, vp, cred, td); 2525 2526 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva, 2527 &attrflag, &eof); 2528 if (attrflag) 2529 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 2530 2531 if (!error) { 2532 /* 2533 * We are now either at the end of the directory or have filled 2534 * the block. 2535 */ 2536 if (eof) { 2537 NFSLOCKNODE(dnp); 2538 dnp->n_direofoffset = uiop->uio_offset; 2539 NFSUNLOCKNODE(dnp); 2540 } else { 2541 if (uiop->uio_resid > 0) 2542 printf("EEK! readdirrpc resid > 0\n"); 2543 ncl_dircookie_lock(dnp); 2544 NFSUNLOCKNODE(dnp); 2545 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2546 *cookiep = cookie; 2547 ncl_dircookie_unlock(dnp); 2548 } 2549 } else if (NFS_ISV4(vp)) { 2550 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2551 } 2552 return (error); 2553 } 2554 2555 /* 2556 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc(). 2557 */ 2558 int 2559 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2560 struct thread *td) 2561 { 2562 struct nfsvattr nfsva; 2563 nfsuint64 *cookiep, cookie; 2564 struct nfsnode *dnp = VTONFS(vp); 2565 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2566 int error = 0, attrflag, eof; 2567 2568 KASSERT(uiop->uio_iovcnt == 1 && 2569 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2570 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2571 ("nfs readdirplusrpc bad uio")); 2572 2573 /* 2574 * If there is no cookie, assume directory was stale. 2575 */ 2576 ncl_dircookie_lock(dnp); 2577 NFSUNLOCKNODE(dnp); 2578 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2579 if (cookiep) { 2580 cookie = *cookiep; 2581 ncl_dircookie_unlock(dnp); 2582 } else { 2583 ncl_dircookie_unlock(dnp); 2584 return (NFSERR_BAD_COOKIE); 2585 } 2586 2587 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2588 (void)ncl_fsinfo(nmp, vp, cred, td); 2589 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva, 2590 &attrflag, &eof); 2591 if (attrflag) 2592 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 2593 2594 if (!error) { 2595 /* 2596 * We are now either at end of the directory or have filled the 2597 * the block. 2598 */ 2599 if (eof) { 2600 NFSLOCKNODE(dnp); 2601 dnp->n_direofoffset = uiop->uio_offset; 2602 NFSUNLOCKNODE(dnp); 2603 } else { 2604 if (uiop->uio_resid > 0) 2605 printf("EEK! readdirplusrpc resid > 0\n"); 2606 ncl_dircookie_lock(dnp); 2607 NFSUNLOCKNODE(dnp); 2608 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2609 *cookiep = cookie; 2610 ncl_dircookie_unlock(dnp); 2611 } 2612 } else if (NFS_ISV4(vp)) { 2613 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2614 } 2615 return (error); 2616 } 2617 2618 /* 2619 * Silly rename. To make the NFS filesystem that is stateless look a little 2620 * more like the "ufs" a remove of an active vnode is translated to a rename 2621 * to a funny looking filename that is removed by nfs_inactive on the 2622 * nfsnode. There is the potential for another process on a different client 2623 * to create the same funny name between the nfs_lookitup() fails and the 2624 * nfs_rename() completes, but... 2625 */ 2626 static int 2627 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2628 { 2629 struct sillyrename *sp; 2630 struct nfsnode *np; 2631 int error; 2632 short pid; 2633 unsigned int lticks; 2634 2635 cache_purge(dvp); 2636 np = VTONFS(vp); 2637 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir")); 2638 sp = malloc(sizeof (struct sillyrename), 2639 M_NEWNFSREQ, M_WAITOK); 2640 sp->s_cred = crhold(cnp->cn_cred); 2641 sp->s_dvp = dvp; 2642 VREF(dvp); 2643 2644 /* 2645 * Fudge together a funny name. 2646 * Changing the format of the funny name to accommodate more 2647 * sillynames per directory. 2648 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2649 * CPU ticks since boot. 2650 */ 2651 pid = curthread->td_proc->p_pid; 2652 lticks = (unsigned int)ticks; 2653 for ( ; ; ) { 2654 sp->s_namlen = sprintf(sp->s_name, 2655 ".nfs.%08x.%04x4.4", lticks, 2656 pid); 2657 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2658 curthread, NULL)) 2659 break; 2660 lticks++; 2661 } 2662 error = nfs_renameit(dvp, vp, cnp, sp); 2663 if (error) 2664 goto bad; 2665 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2666 curthread, &np); 2667 np->n_sillyrename = sp; 2668 return (0); 2669 bad: 2670 vrele(sp->s_dvp); 2671 crfree(sp->s_cred); 2672 free(sp, M_NEWNFSREQ); 2673 return (error); 2674 } 2675 2676 /* 2677 * Look up a file name and optionally either update the file handle or 2678 * allocate an nfsnode, depending on the value of npp. 2679 * npp == NULL --> just do the lookup 2680 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2681 * handled too 2682 * *npp != NULL --> update the file handle in the vnode 2683 */ 2684 static int 2685 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred, 2686 struct thread *td, struct nfsnode **npp) 2687 { 2688 struct vnode *newvp = NULL, *vp; 2689 struct nfsnode *np, *dnp = VTONFS(dvp); 2690 struct nfsfh *nfhp, *onfhp; 2691 struct nfsvattr nfsva, dnfsva; 2692 struct componentname cn; 2693 int error = 0, attrflag, dattrflag; 2694 u_int hash; 2695 struct timespec ts; 2696 2697 nanouptime(&ts); 2698 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva, 2699 &nfhp, &attrflag, &dattrflag, 0); 2700 if (dattrflag) 2701 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 2702 if (npp && !error) { 2703 if (*npp != NULL) { 2704 np = *npp; 2705 vp = NFSTOV(np); 2706 /* 2707 * For NFSv4, check to see if it is the same name and 2708 * replace the name, if it is different. 2709 */ 2710 if (np->n_v4 != NULL && nfsva.na_type == VREG && 2711 (np->n_v4->n4_namelen != len || 2712 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) || 2713 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen || 2714 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2715 dnp->n_fhp->nfh_len))) { 2716 #ifdef notdef 2717 { char nnn[100]; int nnnl; 2718 nnnl = (len < 100) ? len : 99; 2719 bcopy(name, nnn, nnnl); 2720 nnn[nnnl] = '\0'; 2721 printf("replace=%s\n",nnn); 2722 } 2723 #endif 2724 free(np->n_v4, M_NFSV4NODE); 2725 np->n_v4 = malloc( 2726 sizeof (struct nfsv4node) + 2727 dnp->n_fhp->nfh_len + len - 1, 2728 M_NFSV4NODE, M_WAITOK); 2729 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len; 2730 np->n_v4->n4_namelen = len; 2731 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2732 dnp->n_fhp->nfh_len); 2733 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len); 2734 } 2735 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, 2736 FNV1_32_INIT); 2737 onfhp = np->n_fhp; 2738 /* 2739 * Rehash node for new file handle. 2740 */ 2741 vfs_hash_rehash(vp, hash); 2742 np->n_fhp = nfhp; 2743 if (onfhp != NULL) 2744 free(onfhp, M_NFSFH); 2745 newvp = NFSTOV(np); 2746 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) { 2747 free(nfhp, M_NFSFH); 2748 VREF(dvp); 2749 newvp = dvp; 2750 } else { 2751 cn.cn_nameptr = name; 2752 cn.cn_namelen = len; 2753 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td, 2754 &np, LK_EXCLUSIVE); 2755 if (error) 2756 return (error); 2757 newvp = NFSTOV(np); 2758 /* 2759 * If n_localmodtime >= time before RPC, then 2760 * a file modification operation, such as 2761 * VOP_SETATTR() of size, has occurred while 2762 * the Lookup RPC and acquisition of the vnode 2763 * happened. As such, the attributes might 2764 * be stale, with possibly an incorrect size. 2765 */ 2766 NFSLOCKNODE(np); 2767 if (timespecisset(&np->n_localmodtime) && 2768 timespeccmp(&np->n_localmodtime, &ts, >=)) { 2769 NFSCL_DEBUG(4, "nfs_lookitup: localmod " 2770 "stale attributes\n"); 2771 attrflag = 0; 2772 } 2773 NFSUNLOCKNODE(np); 2774 } 2775 if (!attrflag && *npp == NULL) { 2776 if (newvp == dvp) 2777 vrele(newvp); 2778 else 2779 vput(newvp); 2780 return (ENOENT); 2781 } 2782 if (attrflag) 2783 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 2784 } 2785 if (npp && *npp == NULL) { 2786 if (error) { 2787 if (newvp) { 2788 if (newvp == dvp) 2789 vrele(newvp); 2790 else 2791 vput(newvp); 2792 } 2793 } else 2794 *npp = np; 2795 } 2796 if (error && NFS_ISV4(dvp)) 2797 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2798 return (error); 2799 } 2800 2801 /* 2802 * Nfs Version 3 and 4 commit rpc 2803 */ 2804 int 2805 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2806 struct thread *td) 2807 { 2808 struct nfsvattr nfsva; 2809 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2810 struct nfsnode *np; 2811 struct uio uio; 2812 int error, attrflag; 2813 2814 np = VTONFS(vp); 2815 error = EIO; 2816 attrflag = 0; 2817 if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) { 2818 uio.uio_offset = offset; 2819 uio.uio_resid = cnt; 2820 error = nfscl_doiods(vp, &uio, NULL, NULL, 2821 NFSV4OPEN_ACCESSWRITE, 1, cred, td); 2822 if (error != 0) { 2823 NFSLOCKNODE(np); 2824 np->n_flag &= ~NDSCOMMIT; 2825 NFSUNLOCKNODE(np); 2826 } 2827 } 2828 if (error != 0) { 2829 mtx_lock(&nmp->nm_mtx); 2830 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2831 mtx_unlock(&nmp->nm_mtx); 2832 return (0); 2833 } 2834 mtx_unlock(&nmp->nm_mtx); 2835 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva, 2836 &attrflag); 2837 } 2838 if (attrflag != 0) 2839 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 2840 if (error != 0 && NFS_ISV4(vp)) 2841 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2842 return (error); 2843 } 2844 2845 /* 2846 * Strategy routine. 2847 * For async requests when nfsiod(s) are running, queue the request by 2848 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the 2849 * request. 2850 */ 2851 static int 2852 nfs_strategy(struct vop_strategy_args *ap) 2853 { 2854 struct buf *bp; 2855 struct vnode *vp; 2856 struct ucred *cr; 2857 2858 bp = ap->a_bp; 2859 vp = ap->a_vp; 2860 KASSERT(bp->b_vp == vp, ("missing b_getvp")); 2861 KASSERT(!(bp->b_flags & B_DONE), 2862 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2863 2864 if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno) 2865 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize / 2866 DEV_BSIZE); 2867 if (bp->b_iocmd == BIO_READ) 2868 cr = bp->b_rcred; 2869 else 2870 cr = bp->b_wcred; 2871 2872 /* 2873 * If the op is asynchronous and an i/o daemon is waiting 2874 * queue the request, wake it up and wait for completion 2875 * otherwise just do it ourselves. 2876 */ 2877 if ((bp->b_flags & B_ASYNC) == 0 || 2878 ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread)) 2879 (void) ncl_doio(vp, bp, cr, curthread, 1); 2880 return (0); 2881 } 2882 2883 /* 2884 * fsync vnode op. Just call ncl_flush() with commit == 1. 2885 */ 2886 /* ARGSUSED */ 2887 static int 2888 nfs_fsync(struct vop_fsync_args *ap) 2889 { 2890 2891 if (ap->a_vp->v_type != VREG) { 2892 /* 2893 * For NFS, metadata is changed synchronously on the server, 2894 * so there is nothing to flush. Also, ncl_flush() clears 2895 * the NMODIFIED flag and that shouldn't be done here for 2896 * directories. 2897 */ 2898 return (0); 2899 } 2900 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0)); 2901 } 2902 2903 /* 2904 * Flush all the blocks associated with a vnode. 2905 * Walk through the buffer pool and push any dirty pages 2906 * associated with the vnode. 2907 * If the called_from_renewthread argument is TRUE, it has been called 2908 * from the NFSv4 renew thread and, as such, cannot block indefinitely 2909 * waiting for a buffer write to complete. 2910 */ 2911 int 2912 ncl_flush(struct vnode *vp, int waitfor, struct thread *td, 2913 int commit, int called_from_renewthread) 2914 { 2915 struct nfsnode *np = VTONFS(vp); 2916 struct buf *bp; 2917 int i; 2918 struct buf *nbp; 2919 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2920 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2921 int passone = 1, trycnt = 0; 2922 u_quad_t off, endoff, toff; 2923 struct ucred* wcred = NULL; 2924 struct buf **bvec = NULL; 2925 struct bufobj *bo; 2926 #ifndef NFS_COMMITBVECSIZ 2927 #define NFS_COMMITBVECSIZ 20 2928 #endif 2929 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2930 u_int bvecsize = 0, bveccount; 2931 struct timespec ts; 2932 2933 if (called_from_renewthread != 0) 2934 slptimeo = hz; 2935 if (nmp->nm_flag & NFSMNT_INT) 2936 slpflag = PCATCH; 2937 if (!commit) 2938 passone = 0; 2939 bo = &vp->v_bufobj; 2940 /* 2941 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2942 * server, but has not been committed to stable storage on the server 2943 * yet. On the first pass, the byte range is worked out and the commit 2944 * rpc is done. On the second pass, ncl_writebp() is called to do the 2945 * job. 2946 */ 2947 again: 2948 off = (u_quad_t)-1; 2949 endoff = 0; 2950 bvecpos = 0; 2951 if (NFS_ISV34(vp) && commit) { 2952 if (bvec != NULL && bvec != bvec_on_stack) 2953 free(bvec, M_TEMP); 2954 /* 2955 * Count up how many buffers waiting for a commit. 2956 */ 2957 bveccount = 0; 2958 BO_LOCK(bo); 2959 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2960 if (!BUF_ISLOCKED(bp) && 2961 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2962 == (B_DELWRI | B_NEEDCOMMIT)) 2963 bveccount++; 2964 } 2965 /* 2966 * Allocate space to remember the list of bufs to commit. It is 2967 * important to use M_NOWAIT here to avoid a race with nfs_write. 2968 * If we can't get memory (for whatever reason), we will end up 2969 * committing the buffers one-by-one in the loop below. 2970 */ 2971 if (bveccount > NFS_COMMITBVECSIZ) { 2972 /* 2973 * Release the vnode interlock to avoid a lock 2974 * order reversal. 2975 */ 2976 BO_UNLOCK(bo); 2977 bvec = (struct buf **) 2978 malloc(bveccount * sizeof(struct buf *), 2979 M_TEMP, M_NOWAIT); 2980 BO_LOCK(bo); 2981 if (bvec == NULL) { 2982 bvec = bvec_on_stack; 2983 bvecsize = NFS_COMMITBVECSIZ; 2984 } else 2985 bvecsize = bveccount; 2986 } else { 2987 bvec = bvec_on_stack; 2988 bvecsize = NFS_COMMITBVECSIZ; 2989 } 2990 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2991 if (bvecpos >= bvecsize) 2992 break; 2993 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2994 nbp = TAILQ_NEXT(bp, b_bobufs); 2995 continue; 2996 } 2997 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2998 (B_DELWRI | B_NEEDCOMMIT)) { 2999 BUF_UNLOCK(bp); 3000 nbp = TAILQ_NEXT(bp, b_bobufs); 3001 continue; 3002 } 3003 BO_UNLOCK(bo); 3004 bremfree(bp); 3005 /* 3006 * Work out if all buffers are using the same cred 3007 * so we can deal with them all with one commit. 3008 * 3009 * NOTE: we are not clearing B_DONE here, so we have 3010 * to do it later on in this routine if we intend to 3011 * initiate I/O on the bp. 3012 * 3013 * Note: to avoid loopback deadlocks, we do not 3014 * assign b_runningbufspace. 3015 */ 3016 if (wcred == NULL) 3017 wcred = bp->b_wcred; 3018 else if (wcred != bp->b_wcred) 3019 wcred = NOCRED; 3020 vfs_busy_pages(bp, 0); 3021 3022 BO_LOCK(bo); 3023 /* 3024 * bp is protected by being locked, but nbp is not 3025 * and vfs_busy_pages() may sleep. We have to 3026 * recalculate nbp. 3027 */ 3028 nbp = TAILQ_NEXT(bp, b_bobufs); 3029 3030 /* 3031 * A list of these buffers is kept so that the 3032 * second loop knows which buffers have actually 3033 * been committed. This is necessary, since there 3034 * may be a race between the commit rpc and new 3035 * uncommitted writes on the file. 3036 */ 3037 bvec[bvecpos++] = bp; 3038 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3039 bp->b_dirtyoff; 3040 if (toff < off) 3041 off = toff; 3042 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 3043 if (toff > endoff) 3044 endoff = toff; 3045 } 3046 BO_UNLOCK(bo); 3047 } 3048 if (bvecpos > 0) { 3049 /* 3050 * Commit data on the server, as required. 3051 * If all bufs are using the same wcred, then use that with 3052 * one call for all of them, otherwise commit each one 3053 * separately. 3054 */ 3055 if (wcred != NOCRED) 3056 retv = ncl_commit(vp, off, (int)(endoff - off), 3057 wcred, td); 3058 else { 3059 retv = 0; 3060 for (i = 0; i < bvecpos; i++) { 3061 off_t off, size; 3062 bp = bvec[i]; 3063 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3064 bp->b_dirtyoff; 3065 size = (u_quad_t)(bp->b_dirtyend 3066 - bp->b_dirtyoff); 3067 retv = ncl_commit(vp, off, (int)size, 3068 bp->b_wcred, td); 3069 if (retv) break; 3070 } 3071 } 3072 3073 if (retv == NFSERR_STALEWRITEVERF) 3074 ncl_clearcommit(vp->v_mount); 3075 3076 /* 3077 * Now, either mark the blocks I/O done or mark the 3078 * blocks dirty, depending on whether the commit 3079 * succeeded. 3080 */ 3081 for (i = 0; i < bvecpos; i++) { 3082 bp = bvec[i]; 3083 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3084 if (!NFSCL_FORCEDISM(vp->v_mount) && retv) { 3085 /* 3086 * Error, leave B_DELWRI intact 3087 */ 3088 vfs_unbusy_pages(bp); 3089 brelse(bp); 3090 } else { 3091 /* 3092 * Success, remove B_DELWRI ( bundirty() ). 3093 * 3094 * b_dirtyoff/b_dirtyend seem to be NFS 3095 * specific. We should probably move that 3096 * into bundirty(). XXX 3097 */ 3098 bufobj_wref(bo); 3099 bp->b_flags |= B_ASYNC; 3100 bundirty(bp); 3101 bp->b_flags &= ~B_DONE; 3102 bp->b_ioflags &= ~BIO_ERROR; 3103 bp->b_dirtyoff = bp->b_dirtyend = 0; 3104 bufdone(bp); 3105 } 3106 } 3107 } 3108 3109 /* 3110 * Start/do any write(s) that are required. 3111 */ 3112 loop: 3113 BO_LOCK(bo); 3114 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3115 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3116 if (waitfor != MNT_WAIT || passone) 3117 continue; 3118 3119 error = BUF_TIMELOCK(bp, 3120 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 3121 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo); 3122 if (error == 0) { 3123 BUF_UNLOCK(bp); 3124 goto loop; 3125 } 3126 if (error == ENOLCK) { 3127 error = 0; 3128 goto loop; 3129 } 3130 if (called_from_renewthread != 0) { 3131 /* 3132 * Return EIO so the flush will be retried 3133 * later. 3134 */ 3135 error = EIO; 3136 goto done; 3137 } 3138 if (newnfs_sigintr(nmp, td)) { 3139 error = EINTR; 3140 goto done; 3141 } 3142 if (slpflag == PCATCH) { 3143 slpflag = 0; 3144 slptimeo = 2 * hz; 3145 } 3146 goto loop; 3147 } 3148 if ((bp->b_flags & B_DELWRI) == 0) 3149 panic("nfs_fsync: not dirty"); 3150 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3151 BUF_UNLOCK(bp); 3152 continue; 3153 } 3154 BO_UNLOCK(bo); 3155 bremfree(bp); 3156 bp->b_flags |= B_ASYNC; 3157 bwrite(bp); 3158 if (newnfs_sigintr(nmp, td)) { 3159 error = EINTR; 3160 goto done; 3161 } 3162 goto loop; 3163 } 3164 if (passone) { 3165 passone = 0; 3166 BO_UNLOCK(bo); 3167 goto again; 3168 } 3169 if (waitfor == MNT_WAIT) { 3170 while (bo->bo_numoutput) { 3171 error = bufobj_wwait(bo, slpflag, slptimeo); 3172 if (error) { 3173 BO_UNLOCK(bo); 3174 if (called_from_renewthread != 0) { 3175 /* 3176 * Return EIO so that the flush will be 3177 * retried later. 3178 */ 3179 error = EIO; 3180 goto done; 3181 } 3182 error = newnfs_sigintr(nmp, td); 3183 if (error) 3184 goto done; 3185 if (slpflag == PCATCH) { 3186 slpflag = 0; 3187 slptimeo = 2 * hz; 3188 } 3189 BO_LOCK(bo); 3190 } 3191 } 3192 if (bo->bo_dirty.bv_cnt != 0 && commit) { 3193 BO_UNLOCK(bo); 3194 goto loop; 3195 } 3196 /* 3197 * Wait for all the async IO requests to drain 3198 */ 3199 BO_UNLOCK(bo); 3200 NFSLOCKNODE(np); 3201 while (np->n_directio_asyncwr > 0) { 3202 np->n_flag |= NFSYNCWAIT; 3203 error = newnfs_msleep(td, &np->n_directio_asyncwr, 3204 &np->n_mtx, slpflag | (PRIBIO + 1), 3205 "nfsfsync", 0); 3206 if (error) { 3207 if (newnfs_sigintr(nmp, td)) { 3208 NFSUNLOCKNODE(np); 3209 error = EINTR; 3210 goto done; 3211 } 3212 } 3213 } 3214 NFSUNLOCKNODE(np); 3215 } else 3216 BO_UNLOCK(bo); 3217 if (NFSHASPNFS(nmp)) { 3218 nfscl_layoutcommit(vp, td); 3219 /* 3220 * Invalidate the attribute cache, since writes to a DS 3221 * won't update the size attribute. 3222 */ 3223 NFSLOCKNODE(np); 3224 np->n_attrstamp = 0; 3225 } else 3226 NFSLOCKNODE(np); 3227 if (np->n_flag & NWRITEERR) { 3228 error = np->n_error; 3229 np->n_flag &= ~NWRITEERR; 3230 } 3231 if (commit && bo->bo_dirty.bv_cnt == 0 && 3232 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) 3233 np->n_flag &= ~NMODIFIED; 3234 NFSUNLOCKNODE(np); 3235 done: 3236 if (bvec != NULL && bvec != bvec_on_stack) 3237 free(bvec, M_TEMP); 3238 if (error == 0 && commit != 0 && waitfor == MNT_WAIT && 3239 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 || 3240 np->n_directio_asyncwr != 0)) { 3241 if (trycnt++ < 5) { 3242 /* try, try again... */ 3243 passone = 1; 3244 wcred = NULL; 3245 bvec = NULL; 3246 bvecsize = 0; 3247 goto again; 3248 } 3249 vn_printf(vp, "ncl_flush failed"); 3250 error = called_from_renewthread != 0 ? EIO : EBUSY; 3251 } 3252 if (error == 0) { 3253 nanouptime(&ts); 3254 NFSLOCKNODE(np); 3255 np->n_localmodtime = ts; 3256 NFSUNLOCKNODE(np); 3257 } 3258 return (error); 3259 } 3260 3261 /* 3262 * NFS advisory byte-level locks. 3263 */ 3264 static int 3265 nfs_advlock(struct vop_advlock_args *ap) 3266 { 3267 struct vnode *vp = ap->a_vp; 3268 struct ucred *cred; 3269 struct nfsnode *np = VTONFS(ap->a_vp); 3270 struct proc *p = (struct proc *)ap->a_id; 3271 struct thread *td = curthread; /* XXX */ 3272 struct vattr va; 3273 int ret, error; 3274 u_quad_t size; 3275 struct nfsmount *nmp; 3276 3277 error = NFSVOPLOCK(vp, LK_SHARED); 3278 if (error != 0) 3279 return (EBADF); 3280 nmp = VFSTONFS(vp->v_mount); 3281 if (!NFS_ISV4(vp) || (nmp->nm_flag & NFSMNT_NOLOCKD) != 0) { 3282 if ((nmp->nm_flag & NFSMNT_NOLOCKD) != 0) { 3283 size = np->n_size; 3284 NFSVOPUNLOCK(vp); 3285 error = lf_advlock(ap, &(vp->v_lockf), size); 3286 } else { 3287 if (nfs_advlock_p != NULL) 3288 error = nfs_advlock_p(ap); 3289 else { 3290 NFSVOPUNLOCK(vp); 3291 error = ENOLCK; 3292 } 3293 } 3294 if (error == 0 && ap->a_op == F_SETLK) { 3295 error = NFSVOPLOCK(vp, LK_SHARED); 3296 if (error == 0) { 3297 /* Mark that a file lock has been acquired. */ 3298 NFSLOCKNODE(np); 3299 np->n_flag |= NHASBEENLOCKED; 3300 NFSUNLOCKNODE(np); 3301 NFSVOPUNLOCK(vp); 3302 } 3303 } 3304 return (error); 3305 } else if ((ap->a_flags & (F_POSIX | F_FLOCK)) != 0) { 3306 if (vp->v_type != VREG) { 3307 error = EINVAL; 3308 goto out; 3309 } 3310 if ((ap->a_flags & F_POSIX) != 0) 3311 cred = p->p_ucred; 3312 else 3313 cred = td->td_ucred; 3314 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 3315 if (VN_IS_DOOMED(vp)) { 3316 error = EBADF; 3317 goto out; 3318 } 3319 3320 /* 3321 * If this is unlocking a write locked region, flush and 3322 * commit them before unlocking. This is required by 3323 * RFC3530 Sec. 9.3.2. 3324 */ 3325 if (ap->a_op == F_UNLCK && 3326 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id, 3327 ap->a_flags)) 3328 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0); 3329 3330 /* 3331 * Mark NFS node as might have acquired a lock. 3332 * This is separate from NHASBEENLOCKED, because it must 3333 * be done before the nfsrpc_advlock() call, which might 3334 * add a nfscllock structure to the client state. 3335 * It is used to check for the case where a nfscllock 3336 * state structure cannot exist for the file. 3337 * Only done for "oneopenown" NFSv4.1/4.2 mounts. 3338 */ 3339 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp)) { 3340 NFSLOCKNODE(np); 3341 np->n_flag |= NMIGHTBELOCKED; 3342 NFSUNLOCKNODE(np); 3343 } 3344 3345 /* 3346 * Loop around doing the lock op, while a blocking lock 3347 * must wait for the lock op to succeed. 3348 */ 3349 do { 3350 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op, 3351 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags); 3352 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3353 ap->a_op == F_SETLK) { 3354 NFSVOPUNLOCK(vp); 3355 error = nfs_catnap(PZERO | PCATCH, ret, 3356 "ncladvl"); 3357 if (error) 3358 return (EINTR); 3359 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY); 3360 if (VN_IS_DOOMED(vp)) { 3361 error = EBADF; 3362 goto out; 3363 } 3364 } 3365 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3366 ap->a_op == F_SETLK); 3367 if (ret == NFSERR_DENIED) { 3368 error = EAGAIN; 3369 goto out; 3370 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) { 3371 error = ret; 3372 goto out; 3373 } else if (ret != 0) { 3374 error = EACCES; 3375 goto out; 3376 } 3377 3378 /* 3379 * Now, if we just got a lock, invalidate data in the buffer 3380 * cache, as required, so that the coherency conforms with 3381 * RFC3530 Sec. 9.3.2. 3382 */ 3383 if (ap->a_op == F_SETLK) { 3384 if ((np->n_flag & NMODIFIED) == 0) { 3385 np->n_attrstamp = 0; 3386 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3387 ret = VOP_GETATTR(vp, &va, cred); 3388 } 3389 if ((np->n_flag & NMODIFIED) || ret || 3390 np->n_change != va.va_filerev) { 3391 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1); 3392 np->n_attrstamp = 0; 3393 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3394 ret = VOP_GETATTR(vp, &va, cred); 3395 if (!ret) { 3396 np->n_mtime = va.va_mtime; 3397 np->n_change = va.va_filerev; 3398 } 3399 } 3400 /* Mark that a file lock has been acquired. */ 3401 NFSLOCKNODE(np); 3402 np->n_flag |= NHASBEENLOCKED; 3403 NFSUNLOCKNODE(np); 3404 } 3405 } else 3406 error = EOPNOTSUPP; 3407 out: 3408 NFSVOPUNLOCK(vp); 3409 return (error); 3410 } 3411 3412 /* 3413 * NFS advisory byte-level locks. 3414 */ 3415 static int 3416 nfs_advlockasync(struct vop_advlockasync_args *ap) 3417 { 3418 struct vnode *vp = ap->a_vp; 3419 u_quad_t size; 3420 int error; 3421 3422 error = NFSVOPLOCK(vp, LK_SHARED); 3423 if (error) 3424 return (error); 3425 if (NFS_ISV4(vp)) { 3426 NFSVOPUNLOCK(vp); 3427 return (EOPNOTSUPP); 3428 } 3429 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3430 size = VTONFS(vp)->n_size; 3431 NFSVOPUNLOCK(vp); 3432 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3433 } else { 3434 NFSVOPUNLOCK(vp); 3435 error = EOPNOTSUPP; 3436 } 3437 return (error); 3438 } 3439 3440 /* 3441 * Print out the contents of an nfsnode. 3442 */ 3443 static int 3444 nfs_print(struct vop_print_args *ap) 3445 { 3446 struct vnode *vp = ap->a_vp; 3447 struct nfsnode *np = VTONFS(vp); 3448 3449 printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid, 3450 (uintmax_t)np->n_vattr.na_fsid); 3451 if (vp->v_type == VFIFO) 3452 fifo_printinfo(vp); 3453 printf("\n"); 3454 return (0); 3455 } 3456 3457 /* 3458 * This is the "real" nfs::bwrite(struct buf*). 3459 * We set B_CACHE if this is a VMIO buffer. 3460 */ 3461 int 3462 ncl_writebp(struct buf *bp, int force __unused, struct thread *td) 3463 { 3464 int oldflags, rtval; 3465 3466 if (bp->b_flags & B_INVAL) { 3467 brelse(bp); 3468 return (0); 3469 } 3470 3471 oldflags = bp->b_flags; 3472 bp->b_flags |= B_CACHE; 3473 3474 /* 3475 * Undirty the bp. We will redirty it later if the I/O fails. 3476 */ 3477 bundirty(bp); 3478 bp->b_flags &= ~B_DONE; 3479 bp->b_ioflags &= ~BIO_ERROR; 3480 bp->b_iocmd = BIO_WRITE; 3481 3482 bufobj_wref(bp->b_bufobj); 3483 curthread->td_ru.ru_oublock++; 3484 3485 /* 3486 * Note: to avoid loopback deadlocks, we do not 3487 * assign b_runningbufspace. 3488 */ 3489 vfs_busy_pages(bp, 1); 3490 3491 BUF_KERNPROC(bp); 3492 bp->b_iooffset = dbtob(bp->b_blkno); 3493 bstrategy(bp); 3494 3495 if ((oldflags & B_ASYNC) != 0) 3496 return (0); 3497 3498 rtval = bufwait(bp); 3499 if (oldflags & B_DELWRI) 3500 reassignbuf(bp); 3501 brelse(bp); 3502 return (rtval); 3503 } 3504 3505 /* 3506 * nfs special file access vnode op. 3507 * Essentially just get vattr and then imitate iaccess() since the device is 3508 * local to the client. 3509 */ 3510 static int 3511 nfsspec_access(struct vop_access_args *ap) 3512 { 3513 struct vattr *vap; 3514 struct ucred *cred = ap->a_cred; 3515 struct vnode *vp = ap->a_vp; 3516 accmode_t accmode = ap->a_accmode; 3517 struct vattr vattr; 3518 int error; 3519 3520 /* 3521 * Disallow write attempts on filesystems mounted read-only; 3522 * unless the file is a socket, fifo, or a block or character 3523 * device resident on the filesystem. 3524 */ 3525 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3526 switch (vp->v_type) { 3527 case VREG: 3528 case VDIR: 3529 case VLNK: 3530 return (EROFS); 3531 default: 3532 break; 3533 } 3534 } 3535 vap = &vattr; 3536 error = VOP_GETATTR(vp, vap, cred); 3537 if (error) 3538 goto out; 3539 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3540 accmode, cred); 3541 out: 3542 return error; 3543 } 3544 3545 /* 3546 * Read wrapper for fifos. 3547 */ 3548 static int 3549 nfsfifo_read(struct vop_read_args *ap) 3550 { 3551 struct nfsnode *np = VTONFS(ap->a_vp); 3552 int error; 3553 3554 /* 3555 * Set access flag. 3556 */ 3557 NFSLOCKNODE(np); 3558 np->n_flag |= NACC; 3559 vfs_timestamp(&np->n_atim); 3560 NFSUNLOCKNODE(np); 3561 error = fifo_specops.vop_read(ap); 3562 return error; 3563 } 3564 3565 /* 3566 * Write wrapper for fifos. 3567 */ 3568 static int 3569 nfsfifo_write(struct vop_write_args *ap) 3570 { 3571 struct nfsnode *np = VTONFS(ap->a_vp); 3572 3573 /* 3574 * Set update flag. 3575 */ 3576 NFSLOCKNODE(np); 3577 np->n_flag |= NUPD; 3578 vfs_timestamp(&np->n_mtim); 3579 NFSUNLOCKNODE(np); 3580 return(fifo_specops.vop_write(ap)); 3581 } 3582 3583 /* 3584 * Close wrapper for fifos. 3585 * 3586 * Update the times on the nfsnode then do fifo close. 3587 */ 3588 static int 3589 nfsfifo_close(struct vop_close_args *ap) 3590 { 3591 struct vnode *vp = ap->a_vp; 3592 struct nfsnode *np = VTONFS(vp); 3593 struct vattr vattr; 3594 struct timespec ts; 3595 3596 NFSLOCKNODE(np); 3597 if (np->n_flag & (NACC | NUPD)) { 3598 vfs_timestamp(&ts); 3599 if (np->n_flag & NACC) 3600 np->n_atim = ts; 3601 if (np->n_flag & NUPD) 3602 np->n_mtim = ts; 3603 np->n_flag |= NCHG; 3604 if (vrefcnt(vp) == 1 && 3605 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3606 VATTR_NULL(&vattr); 3607 if (np->n_flag & NACC) 3608 vattr.va_atime = np->n_atim; 3609 if (np->n_flag & NUPD) 3610 vattr.va_mtime = np->n_mtim; 3611 NFSUNLOCKNODE(np); 3612 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3613 goto out; 3614 } 3615 } 3616 NFSUNLOCKNODE(np); 3617 out: 3618 return (fifo_specops.vop_close(ap)); 3619 } 3620 3621 /* 3622 * Just call ncl_writebp() with the force argument set to 1. 3623 * 3624 * NOTE: B_DONE may or may not be set in a_bp on call. 3625 */ 3626 static int 3627 nfs_bwrite(struct buf *bp) 3628 { 3629 3630 return (ncl_writebp(bp, 1, curthread)); 3631 } 3632 3633 struct buf_ops buf_ops_newnfs = { 3634 .bop_name = "buf_ops_nfs", 3635 .bop_write = nfs_bwrite, 3636 .bop_strategy = bufstrategy, 3637 .bop_sync = bufsync, 3638 .bop_bdflush = bufbdflush, 3639 }; 3640 3641 static int 3642 nfs_getacl(struct vop_getacl_args *ap) 3643 { 3644 int error; 3645 3646 if (ap->a_type != ACL_TYPE_NFS4) 3647 return (EOPNOTSUPP); 3648 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp); 3649 if (error > NFSERR_STALE) { 3650 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3651 error = EPERM; 3652 } 3653 return (error); 3654 } 3655 3656 static int 3657 nfs_setacl(struct vop_setacl_args *ap) 3658 { 3659 int error; 3660 3661 if (ap->a_type != ACL_TYPE_NFS4) 3662 return (EOPNOTSUPP); 3663 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp); 3664 if (error > NFSERR_STALE) { 3665 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3666 error = EPERM; 3667 } 3668 return (error); 3669 } 3670 3671 /* 3672 * VOP_ADVISE for NFS. 3673 * Just return 0 for any errors, since it is just a hint. 3674 */ 3675 static int 3676 nfs_advise(struct vop_advise_args *ap) 3677 { 3678 struct thread *td = curthread; 3679 struct nfsmount *nmp; 3680 uint64_t len; 3681 int error; 3682 3683 /* 3684 * First do vop_stdadvise() to handle the buffer cache. 3685 */ 3686 error = vop_stdadvise(ap); 3687 if (error != 0) 3688 return (error); 3689 if (ap->a_start < 0 || ap->a_end < 0) 3690 return (0); 3691 if (ap->a_end == OFF_MAX) 3692 len = 0; 3693 else if (ap->a_end < ap->a_start) 3694 return (0); 3695 else 3696 len = ap->a_end - ap->a_start + 1; 3697 nmp = VFSTONFS(ap->a_vp->v_mount); 3698 mtx_lock(&nmp->nm_mtx); 3699 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3700 (NFSHASPNFS(nmp) && (nmp->nm_privflag & NFSMNTP_IOADVISETHRUMDS) == 3701 0) || (nmp->nm_privflag & NFSMNTP_NOADVISE) != 0) { 3702 mtx_unlock(&nmp->nm_mtx); 3703 return (0); 3704 } 3705 mtx_unlock(&nmp->nm_mtx); 3706 error = nfsrpc_advise(ap->a_vp, ap->a_start, len, ap->a_advice, 3707 td->td_ucred, td); 3708 if (error == NFSERR_NOTSUPP) { 3709 mtx_lock(&nmp->nm_mtx); 3710 nmp->nm_privflag |= NFSMNTP_NOADVISE; 3711 mtx_unlock(&nmp->nm_mtx); 3712 } 3713 return (0); 3714 } 3715 3716 /* 3717 * nfs allocate call 3718 */ 3719 static int 3720 nfs_allocate(struct vop_allocate_args *ap) 3721 { 3722 struct vnode *vp = ap->a_vp; 3723 struct thread *td = curthread; 3724 struct nfsvattr nfsva; 3725 struct nfsmount *nmp; 3726 struct nfsnode *np; 3727 off_t alen; 3728 int attrflag, error, ret; 3729 struct timespec ts; 3730 struct uio io; 3731 3732 attrflag = 0; 3733 nmp = VFSTONFS(vp->v_mount); 3734 np = VTONFS(vp); 3735 mtx_lock(&nmp->nm_mtx); 3736 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION && 3737 (nmp->nm_privflag & NFSMNTP_NOALLOCATE) == 0) { 3738 mtx_unlock(&nmp->nm_mtx); 3739 alen = *ap->a_len; 3740 if ((uint64_t)alen > nfs_maxalloclen) 3741 alen = nfs_maxalloclen; 3742 3743 /* Check the file size limit. */ 3744 io.uio_offset = *ap->a_offset; 3745 io.uio_resid = alen; 3746 error = vn_rlimit_fsize(vp, &io, td); 3747 3748 /* 3749 * Flush first to ensure that the allocate adds to the 3750 * file's allocation on the server. 3751 */ 3752 if (error == 0) 3753 error = ncl_flush(vp, MNT_WAIT, td, 1, 0); 3754 if (error == 0) 3755 error = nfsrpc_allocate(vp, *ap->a_offset, alen, 3756 &nfsva, &attrflag, ap->a_cred, td); 3757 if (error == 0) { 3758 *ap->a_offset += alen; 3759 *ap->a_len -= alen; 3760 nanouptime(&ts); 3761 NFSLOCKNODE(np); 3762 np->n_localmodtime = ts; 3763 NFSUNLOCKNODE(np); 3764 } else if (error == NFSERR_NOTSUPP) { 3765 mtx_lock(&nmp->nm_mtx); 3766 nmp->nm_privflag |= NFSMNTP_NOALLOCATE; 3767 mtx_unlock(&nmp->nm_mtx); 3768 error = EINVAL; 3769 } 3770 } else { 3771 mtx_unlock(&nmp->nm_mtx); 3772 error = EINVAL; 3773 } 3774 if (attrflag != 0) { 3775 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 3776 if (error == 0 && ret != 0) 3777 error = ret; 3778 } 3779 if (error != 0) 3780 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 3781 return (error); 3782 } 3783 3784 /* 3785 * nfs deallocate call 3786 */ 3787 static int 3788 nfs_deallocate(struct vop_deallocate_args *ap) 3789 { 3790 struct vnode *vp = ap->a_vp; 3791 struct thread *td = curthread; 3792 struct nfsvattr nfsva; 3793 struct nfsmount *nmp; 3794 struct nfsnode *np; 3795 off_t tlen, mlen; 3796 int attrflag, error, ret; 3797 bool clipped; 3798 struct timespec ts; 3799 3800 error = 0; 3801 attrflag = 0; 3802 nmp = VFSTONFS(vp->v_mount); 3803 np = VTONFS(vp); 3804 mtx_lock(&nmp->nm_mtx); 3805 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION && 3806 (nmp->nm_privflag & NFSMNTP_NODEALLOCATE) == 0) { 3807 mtx_unlock(&nmp->nm_mtx); 3808 tlen = omin(OFF_MAX - *ap->a_offset, *ap->a_len); 3809 NFSCL_DEBUG(4, "dealloc: off=%jd len=%jd maxfilesize=%ju\n", 3810 (intmax_t)*ap->a_offset, (intmax_t)tlen, 3811 (uintmax_t)nmp->nm_maxfilesize); 3812 if ((uint64_t)*ap->a_offset >= nmp->nm_maxfilesize) { 3813 /* Avoid EFBIG error return from the NFSv4.2 server. */ 3814 *ap->a_len = 0; 3815 return (0); 3816 } 3817 clipped = false; 3818 if ((uint64_t)*ap->a_offset + tlen > nmp->nm_maxfilesize) 3819 tlen = nmp->nm_maxfilesize - *ap->a_offset; 3820 if ((uint64_t)*ap->a_offset < np->n_size) { 3821 /* Limit the len to nfs_maxalloclen before EOF. */ 3822 mlen = omin((off_t)np->n_size - *ap->a_offset, tlen); 3823 if ((uint64_t)mlen > nfs_maxalloclen) { 3824 NFSCL_DEBUG(4, "dealloc: tlen maxalloclen\n"); 3825 tlen = nfs_maxalloclen; 3826 clipped = true; 3827 } 3828 } 3829 if (error == 0) 3830 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 3831 if (error == 0) { 3832 vnode_pager_purge_range(vp, *ap->a_offset, 3833 *ap->a_offset + tlen); 3834 error = nfsrpc_deallocate(vp, *ap->a_offset, tlen, 3835 &nfsva, &attrflag, ap->a_cred, td); 3836 NFSCL_DEBUG(4, "dealloc: rpc=%d\n", error); 3837 } 3838 if (error == 0) { 3839 NFSCL_DEBUG(4, "dealloc: attrflag=%d na_size=%ju\n", 3840 attrflag, (uintmax_t)nfsva.na_size); 3841 nanouptime(&ts); 3842 NFSLOCKNODE(np); 3843 np->n_localmodtime = ts; 3844 NFSUNLOCKNODE(np); 3845 if (attrflag != 0) { 3846 if ((uint64_t)*ap->a_offset < nfsva.na_size) 3847 *ap->a_offset += omin((off_t) 3848 nfsva.na_size - *ap->a_offset, 3849 tlen); 3850 } 3851 if (clipped && tlen < *ap->a_len) 3852 *ap->a_len -= tlen; 3853 else 3854 *ap->a_len = 0; 3855 } else if (error == NFSERR_NOTSUPP) { 3856 mtx_lock(&nmp->nm_mtx); 3857 nmp->nm_privflag |= NFSMNTP_NODEALLOCATE; 3858 mtx_unlock(&nmp->nm_mtx); 3859 } 3860 } else { 3861 mtx_unlock(&nmp->nm_mtx); 3862 error = EIO; 3863 } 3864 /* 3865 * If the NFS server cannot perform the Deallocate operation, just call 3866 * vop_stddeallocate() to perform it. 3867 */ 3868 if (error != 0 && error != NFSERR_FBIG && error != NFSERR_INVAL) { 3869 error = vop_stddeallocate(ap); 3870 NFSCL_DEBUG(4, "dealloc: stddeallocate=%d\n", error); 3871 } 3872 if (attrflag != 0) { 3873 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 3874 if (error == 0 && ret != 0) 3875 error = ret; 3876 } 3877 if (error != 0) 3878 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 3879 return (error); 3880 } 3881 3882 /* 3883 * nfs copy_file_range call 3884 */ 3885 static int 3886 nfs_copy_file_range(struct vop_copy_file_range_args *ap) 3887 { 3888 struct vnode *invp = ap->a_invp; 3889 struct vnode *outvp = ap->a_outvp; 3890 struct mount *mp; 3891 struct nfsvattr innfsva, outnfsva; 3892 struct vattr *vap; 3893 struct uio io; 3894 struct nfsmount *nmp; 3895 size_t len, len2; 3896 ssize_t r; 3897 int error, inattrflag, outattrflag, ret, ret2; 3898 off_t inoff, outoff; 3899 bool consecutive, must_commit, tryoutcred; 3900 3901 /* 3902 * NFSv4.2 Copy is not permitted for infile == outfile. 3903 * TODO: copy_file_range() between multiple NFS mountpoints 3904 */ 3905 if (invp == outvp || invp->v_mount != outvp->v_mount) { 3906 generic_copy: 3907 return (vn_generic_copy_file_range(invp, ap->a_inoffp, 3908 outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, 3909 ap->a_incred, ap->a_outcred, ap->a_fsizetd)); 3910 } 3911 3912 /* Lock both vnodes, avoiding risk of deadlock. */ 3913 do { 3914 mp = NULL; 3915 error = vn_start_write(outvp, &mp, V_WAIT); 3916 if (error == 0) { 3917 error = vn_lock(outvp, LK_EXCLUSIVE); 3918 if (error == 0) { 3919 error = vn_lock(invp, LK_SHARED | LK_NOWAIT); 3920 if (error == 0) 3921 break; 3922 VOP_UNLOCK(outvp); 3923 if (mp != NULL) 3924 vn_finished_write(mp); 3925 mp = NULL; 3926 error = vn_lock(invp, LK_SHARED); 3927 if (error == 0) 3928 VOP_UNLOCK(invp); 3929 } 3930 } 3931 if (mp != NULL) 3932 vn_finished_write(mp); 3933 } while (error == 0); 3934 if (error != 0) 3935 return (error); 3936 3937 /* 3938 * More reasons to avoid nfs copy: not NFSv4.2, or explicitly 3939 * disabled. 3940 */ 3941 nmp = VFSTONFS(invp->v_mount); 3942 mtx_lock(&nmp->nm_mtx); 3943 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3944 (nmp->nm_privflag & NFSMNTP_NOCOPY) != 0) { 3945 mtx_unlock(&nmp->nm_mtx); 3946 VOP_UNLOCK(invp); 3947 VOP_UNLOCK(outvp); 3948 if (mp != NULL) 3949 vn_finished_write(mp); 3950 goto generic_copy; 3951 } 3952 mtx_unlock(&nmp->nm_mtx); 3953 3954 /* 3955 * Do the vn_rlimit_fsize() check. Should this be above the VOP layer? 3956 */ 3957 io.uio_offset = *ap->a_outoffp; 3958 io.uio_resid = *ap->a_lenp; 3959 error = vn_rlimit_fsizex(outvp, &io, 0, &r, ap->a_fsizetd); 3960 *ap->a_lenp = io.uio_resid; 3961 /* 3962 * No need to call vn_rlimit_fsizex_res before return, since the uio is 3963 * local. 3964 */ 3965 3966 /* 3967 * Flush the input file so that the data is up to date before 3968 * the copy. Flush writes for the output file so that they 3969 * do not overwrite the data copied to the output file by the Copy. 3970 * Set the commit argument for both flushes so that the data is on 3971 * stable storage before the Copy RPC. This is done in case the 3972 * server reboots during the Copy and needs to be redone. 3973 */ 3974 if (error == 0) 3975 error = ncl_flush(invp, MNT_WAIT, curthread, 1, 0); 3976 if (error == 0) 3977 error = ncl_flush(outvp, MNT_WAIT, curthread, 1, 0); 3978 3979 /* Do the actual NFSv4.2 RPC. */ 3980 ret = ret2 = 0; 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, 0, 1); 4029 if (outattrflag != 0) 4030 ret2 = nfscl_loadattrcache(&outvp, &outnfsva, NULL, 4031 1, 1); 4032 if (error == 0) { 4033 if (consecutive == false) { 4034 if (len2 == len) { 4035 mtx_lock(&nmp->nm_mtx); 4036 nmp->nm_privflag |= 4037 NFSMNTP_NOCONSECUTIVE; 4038 mtx_unlock(&nmp->nm_mtx); 4039 } else 4040 error = NFSERR_OFFLOADNOREQS; 4041 } 4042 *ap->a_lenp = len2; 4043 len = 0; 4044 if (len2 > 0 && must_commit && error == 0) 4045 error = ncl_commit(outvp, outoff, *ap->a_lenp, 4046 ap->a_outcred, curthread); 4047 if (error == 0 && ret != 0) 4048 error = ret; 4049 if (error == 0 && ret2 != 0) 4050 error = ret2; 4051 } else if (error == NFSERR_OFFLOADNOREQS && consecutive) { 4052 /* 4053 * Try consecutive == false, which is ok only if all 4054 * bytes are copied. 4055 * If only some bytes were copied when consecutive 4056 * is false, there is no way to know which bytes 4057 * still need to be written. 4058 */ 4059 consecutive = false; 4060 error = 0; 4061 } else if (error == NFSERR_ACCES && tryoutcred) { 4062 /* Try again with incred. */ 4063 tryoutcred = false; 4064 error = 0; 4065 } 4066 if (error == NFSERR_STALEWRITEVERF) { 4067 /* 4068 * Server rebooted, so do it all again. 4069 */ 4070 *ap->a_inoffp = inoff; 4071 *ap->a_outoffp = outoff; 4072 len = *ap->a_lenp; 4073 must_commit = false; 4074 error = 0; 4075 } 4076 } 4077 VOP_UNLOCK(invp); 4078 VOP_UNLOCK(outvp); 4079 if (mp != NULL) 4080 vn_finished_write(mp); 4081 if (error == NFSERR_NOTSUPP || error == NFSERR_OFFLOADNOREQS || 4082 error == NFSERR_ACCES) { 4083 /* 4084 * Unlike the NFSv4.2 Copy, vn_generic_copy_file_range() can 4085 * use a_incred for the read and a_outcred for the write, so 4086 * try this for NFSERR_ACCES failures for the Copy. 4087 * For NFSERR_NOTSUPP and NFSERR_OFFLOADNOREQS, the Copy can 4088 * never succeed, so disable it. 4089 */ 4090 if (error != NFSERR_ACCES) { 4091 /* Can never do Copy on this mount. */ 4092 mtx_lock(&nmp->nm_mtx); 4093 nmp->nm_privflag |= NFSMNTP_NOCOPY; 4094 mtx_unlock(&nmp->nm_mtx); 4095 } 4096 *ap->a_inoffp = inoff; 4097 *ap->a_outoffp = outoff; 4098 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 4099 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, 4100 ap->a_incred, ap->a_outcred, ap->a_fsizetd); 4101 } else if (error != 0) 4102 *ap->a_lenp = 0; 4103 4104 if (error != 0) 4105 error = nfscl_maperr(curthread, error, (uid_t)0, (gid_t)0); 4106 return (error); 4107 } 4108 4109 /* 4110 * nfs ioctl call 4111 */ 4112 static int 4113 nfs_ioctl(struct vop_ioctl_args *ap) 4114 { 4115 struct vnode *vp = ap->a_vp; 4116 struct nfsvattr nfsva; 4117 struct nfsmount *nmp; 4118 int attrflag, content, error, ret; 4119 bool eof = false; /* shut up compiler. */ 4120 4121 /* Do the actual NFSv4.2 RPC. */ 4122 switch (ap->a_command) { 4123 case FIOSEEKDATA: 4124 content = NFSV4CONTENT_DATA; 4125 break; 4126 case FIOSEEKHOLE: 4127 content = NFSV4CONTENT_HOLE; 4128 break; 4129 default: 4130 return (ENOTTY); 4131 } 4132 4133 error = vn_lock(vp, LK_SHARED); 4134 if (error != 0) 4135 return (EBADF); 4136 4137 if (vp->v_type != VREG) { 4138 VOP_UNLOCK(vp); 4139 return (ENOTTY); 4140 } 4141 nmp = VFSTONFS(vp->v_mount); 4142 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) { 4143 VOP_UNLOCK(vp); 4144 error = vop_stdioctl(ap); 4145 return (error); 4146 } 4147 4148 attrflag = 0; 4149 if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size) 4150 error = ENXIO; 4151 else { 4152 /* 4153 * Flush all writes, so that the server is up to date. 4154 * Although a Commit is not required, the commit argument 4155 * is set so that, for a pNFS File/Flexible File Layout 4156 * server, the LayoutCommit will be done to ensure the file 4157 * size is up to date on the Metadata Server. 4158 */ 4159 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0); 4160 if (error == 0) 4161 error = nfsrpc_seek(vp, (off_t *)ap->a_data, &eof, 4162 content, ap->a_cred, &nfsva, &attrflag); 4163 /* If at eof for FIOSEEKDATA, return ENXIO. */ 4164 if (eof && error == 0 && content == NFSV4CONTENT_DATA) 4165 error = ENXIO; 4166 } 4167 if (attrflag != 0) { 4168 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4169 if (error == 0 && ret != 0) 4170 error = ret; 4171 } 4172 NFSVOPUNLOCK(vp); 4173 4174 if (error != 0) 4175 error = ENXIO; 4176 return (error); 4177 } 4178 4179 /* 4180 * nfs getextattr call 4181 */ 4182 static int 4183 nfs_getextattr(struct vop_getextattr_args *ap) 4184 { 4185 struct vnode *vp = ap->a_vp; 4186 struct nfsmount *nmp; 4187 struct ucred *cred; 4188 struct thread *td = ap->a_td; 4189 struct nfsvattr nfsva; 4190 ssize_t len; 4191 int attrflag, error, ret; 4192 4193 nmp = VFSTONFS(vp->v_mount); 4194 mtx_lock(&nmp->nm_mtx); 4195 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4196 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4197 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4198 mtx_unlock(&nmp->nm_mtx); 4199 return (EOPNOTSUPP); 4200 } 4201 mtx_unlock(&nmp->nm_mtx); 4202 4203 cred = ap->a_cred; 4204 if (cred == NULL) 4205 cred = td->td_ucred; 4206 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4207 attrflag = 0; 4208 error = nfsrpc_getextattr(vp, ap->a_name, ap->a_uio, &len, &nfsva, 4209 &attrflag, cred, td); 4210 if (attrflag != 0) { 4211 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4212 if (error == 0 && ret != 0) 4213 error = ret; 4214 } 4215 if (error == 0 && ap->a_size != NULL) 4216 *ap->a_size = len; 4217 4218 switch (error) { 4219 case NFSERR_NOTSUPP: 4220 case NFSERR_OPILLEGAL: 4221 mtx_lock(&nmp->nm_mtx); 4222 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4223 mtx_unlock(&nmp->nm_mtx); 4224 error = EOPNOTSUPP; 4225 break; 4226 case NFSERR_NOXATTR: 4227 case NFSERR_XATTR2BIG: 4228 error = ENOATTR; 4229 break; 4230 default: 4231 error = nfscl_maperr(td, error, 0, 0); 4232 break; 4233 } 4234 return (error); 4235 } 4236 4237 /* 4238 * nfs setextattr call 4239 */ 4240 static int 4241 nfs_setextattr(struct vop_setextattr_args *ap) 4242 { 4243 struct vnode *vp = ap->a_vp; 4244 struct nfsmount *nmp; 4245 struct ucred *cred; 4246 struct thread *td = ap->a_td; 4247 struct nfsvattr nfsva; 4248 int attrflag, error, ret; 4249 4250 nmp = VFSTONFS(vp->v_mount); 4251 mtx_lock(&nmp->nm_mtx); 4252 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4253 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4254 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4255 mtx_unlock(&nmp->nm_mtx); 4256 return (EOPNOTSUPP); 4257 } 4258 mtx_unlock(&nmp->nm_mtx); 4259 4260 if (ap->a_uio->uio_resid < 0) 4261 return (EINVAL); 4262 cred = ap->a_cred; 4263 if (cred == NULL) 4264 cred = td->td_ucred; 4265 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4266 attrflag = 0; 4267 error = nfsrpc_setextattr(vp, ap->a_name, ap->a_uio, &nfsva, 4268 &attrflag, cred, td); 4269 if (attrflag != 0) { 4270 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4271 if (error == 0 && ret != 0) 4272 error = ret; 4273 } 4274 4275 switch (error) { 4276 case NFSERR_NOTSUPP: 4277 case NFSERR_OPILLEGAL: 4278 mtx_lock(&nmp->nm_mtx); 4279 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4280 mtx_unlock(&nmp->nm_mtx); 4281 error = EOPNOTSUPP; 4282 break; 4283 case NFSERR_NOXATTR: 4284 case NFSERR_XATTR2BIG: 4285 error = ENOATTR; 4286 break; 4287 default: 4288 error = nfscl_maperr(td, error, 0, 0); 4289 break; 4290 } 4291 return (error); 4292 } 4293 4294 /* 4295 * nfs listextattr call 4296 */ 4297 static int 4298 nfs_listextattr(struct vop_listextattr_args *ap) 4299 { 4300 struct vnode *vp = ap->a_vp; 4301 struct nfsmount *nmp; 4302 struct ucred *cred; 4303 struct thread *td = ap->a_td; 4304 struct nfsvattr nfsva; 4305 size_t len, len2; 4306 uint64_t cookie; 4307 int attrflag, error, ret; 4308 bool eof; 4309 4310 nmp = VFSTONFS(vp->v_mount); 4311 mtx_lock(&nmp->nm_mtx); 4312 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4313 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4314 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4315 mtx_unlock(&nmp->nm_mtx); 4316 return (EOPNOTSUPP); 4317 } 4318 mtx_unlock(&nmp->nm_mtx); 4319 4320 cred = ap->a_cred; 4321 if (cred == NULL) 4322 cred = td->td_ucred; 4323 4324 /* Loop around doing List Extended Attribute RPCs. */ 4325 eof = false; 4326 cookie = 0; 4327 len2 = 0; 4328 error = 0; 4329 while (!eof && error == 0) { 4330 len = nmp->nm_rsize; 4331 attrflag = 0; 4332 error = nfsrpc_listextattr(vp, &cookie, ap->a_uio, &len, &eof, 4333 &nfsva, &attrflag, cred, td); 4334 if (attrflag != 0) { 4335 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4336 if (error == 0 && ret != 0) 4337 error = ret; 4338 } 4339 if (error == 0) { 4340 len2 += len; 4341 if (len2 > SSIZE_MAX) 4342 error = ENOATTR; 4343 } 4344 } 4345 if (error == 0 && ap->a_size != NULL) 4346 *ap->a_size = len2; 4347 4348 switch (error) { 4349 case NFSERR_NOTSUPP: 4350 case NFSERR_OPILLEGAL: 4351 mtx_lock(&nmp->nm_mtx); 4352 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4353 mtx_unlock(&nmp->nm_mtx); 4354 error = EOPNOTSUPP; 4355 break; 4356 case NFSERR_NOXATTR: 4357 case NFSERR_XATTR2BIG: 4358 error = ENOATTR; 4359 break; 4360 default: 4361 error = nfscl_maperr(td, error, 0, 0); 4362 break; 4363 } 4364 return (error); 4365 } 4366 4367 /* 4368 * nfs setextattr call 4369 */ 4370 static int 4371 nfs_deleteextattr(struct vop_deleteextattr_args *ap) 4372 { 4373 struct vnode *vp = ap->a_vp; 4374 struct nfsmount *nmp; 4375 struct nfsvattr nfsva; 4376 int attrflag, error, ret; 4377 4378 nmp = VFSTONFS(vp->v_mount); 4379 mtx_lock(&nmp->nm_mtx); 4380 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4381 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4382 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4383 mtx_unlock(&nmp->nm_mtx); 4384 return (EOPNOTSUPP); 4385 } 4386 mtx_unlock(&nmp->nm_mtx); 4387 4388 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4389 attrflag = 0; 4390 error = nfsrpc_rmextattr(vp, ap->a_name, &nfsva, &attrflag, ap->a_cred, 4391 ap->a_td); 4392 if (attrflag != 0) { 4393 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4394 if (error == 0 && ret != 0) 4395 error = ret; 4396 } 4397 4398 switch (error) { 4399 case NFSERR_NOTSUPP: 4400 case NFSERR_OPILLEGAL: 4401 mtx_lock(&nmp->nm_mtx); 4402 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4403 mtx_unlock(&nmp->nm_mtx); 4404 error = EOPNOTSUPP; 4405 break; 4406 case NFSERR_NOXATTR: 4407 case NFSERR_XATTR2BIG: 4408 error = ENOATTR; 4409 break; 4410 default: 4411 error = nfscl_maperr(ap->a_td, error, 0, 0); 4412 break; 4413 } 4414 return (error); 4415 } 4416 4417 /* 4418 * Return POSIX pathconf information applicable to nfs filesystems. 4419 */ 4420 static int 4421 nfs_pathconf(struct vop_pathconf_args *ap) 4422 { 4423 struct nfsv3_pathconf pc; 4424 struct nfsvattr nfsva; 4425 struct vnode *vp = ap->a_vp; 4426 struct nfsmount *nmp; 4427 struct thread *td = curthread; 4428 off_t off; 4429 bool eof; 4430 int attrflag, error; 4431 4432 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX || 4433 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED || 4434 ap->a_name == _PC_NO_TRUNC)) || 4435 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) { 4436 /* 4437 * Since only the above 4 a_names are returned by the NFSv3 4438 * Pathconf RPC, there is no point in doing it for others. 4439 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can 4440 * be used for _PC_NFS4_ACL as well. 4441 */ 4442 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva, 4443 &attrflag); 4444 if (attrflag != 0) 4445 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4446 if (error != 0) 4447 return (error); 4448 } else { 4449 /* 4450 * For NFSv2 (or NFSv3 when not one of the above 4 a_names), 4451 * just fake them. 4452 */ 4453 pc.pc_linkmax = NFS_LINK_MAX; 4454 pc.pc_namemax = NFS_MAXNAMLEN; 4455 pc.pc_notrunc = 1; 4456 pc.pc_chownrestricted = 1; 4457 pc.pc_caseinsensitive = 0; 4458 pc.pc_casepreserving = 1; 4459 error = 0; 4460 } 4461 switch (ap->a_name) { 4462 case _PC_LINK_MAX: 4463 #ifdef _LP64 4464 *ap->a_retval = pc.pc_linkmax; 4465 #else 4466 *ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax); 4467 #endif 4468 break; 4469 case _PC_NAME_MAX: 4470 *ap->a_retval = pc.pc_namemax; 4471 break; 4472 case _PC_PIPE_BUF: 4473 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 4474 *ap->a_retval = PIPE_BUF; 4475 else 4476 error = EINVAL; 4477 break; 4478 case _PC_CHOWN_RESTRICTED: 4479 *ap->a_retval = pc.pc_chownrestricted; 4480 break; 4481 case _PC_NO_TRUNC: 4482 *ap->a_retval = pc.pc_notrunc; 4483 break; 4484 case _PC_ACL_NFS4: 4485 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 && 4486 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL)) 4487 *ap->a_retval = 1; 4488 else 4489 *ap->a_retval = 0; 4490 break; 4491 case _PC_ACL_PATH_MAX: 4492 if (NFS_ISV4(vp)) 4493 *ap->a_retval = ACL_MAX_ENTRIES; 4494 else 4495 *ap->a_retval = 3; 4496 break; 4497 case _PC_PRIO_IO: 4498 *ap->a_retval = 0; 4499 break; 4500 case _PC_SYNC_IO: 4501 *ap->a_retval = 0; 4502 break; 4503 case _PC_ALLOC_SIZE_MIN: 4504 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize; 4505 break; 4506 case _PC_FILESIZEBITS: 4507 if (NFS_ISV34(vp)) 4508 *ap->a_retval = 64; 4509 else 4510 *ap->a_retval = 32; 4511 break; 4512 case _PC_REC_INCR_XFER_SIZE: 4513 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4514 break; 4515 case _PC_REC_MAX_XFER_SIZE: 4516 *ap->a_retval = -1; /* means ``unlimited'' */ 4517 break; 4518 case _PC_REC_MIN_XFER_SIZE: 4519 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4520 break; 4521 case _PC_REC_XFER_ALIGN: 4522 *ap->a_retval = PAGE_SIZE; 4523 break; 4524 case _PC_SYMLINK_MAX: 4525 *ap->a_retval = NFS_MAXPATHLEN; 4526 break; 4527 case _PC_MIN_HOLE_SIZE: 4528 /* Only some NFSv4.2 servers support Seek for Holes. */ 4529 *ap->a_retval = 0; 4530 nmp = VFSTONFS(vp->v_mount); 4531 if (NFS_ISV4(vp) && nmp->nm_minorvers == NFSV42_MINORVERSION) { 4532 /* 4533 * NFSv4.2 doesn't have an attribute for hole size, 4534 * so all we can do is see if the Seek operation is 4535 * supported and then use f_iosize as a "best guess". 4536 */ 4537 mtx_lock(&nmp->nm_mtx); 4538 if ((nmp->nm_privflag & NFSMNTP_SEEKTESTED) == 0) { 4539 mtx_unlock(&nmp->nm_mtx); 4540 off = 0; 4541 attrflag = 0; 4542 error = nfsrpc_seek(vp, &off, &eof, 4543 NFSV4CONTENT_HOLE, td->td_ucred, &nfsva, 4544 &attrflag); 4545 if (attrflag != 0) 4546 (void) nfscl_loadattrcache(&vp, &nfsva, 4547 NULL, 0, 1); 4548 mtx_lock(&nmp->nm_mtx); 4549 if (error == NFSERR_NOTSUPP) 4550 nmp->nm_privflag |= NFSMNTP_SEEKTESTED; 4551 else 4552 nmp->nm_privflag |= NFSMNTP_SEEKTESTED | 4553 NFSMNTP_SEEK; 4554 error = 0; 4555 } 4556 if ((nmp->nm_privflag & NFSMNTP_SEEK) != 0) 4557 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4558 mtx_unlock(&nmp->nm_mtx); 4559 } 4560 break; 4561 4562 default: 4563 error = vop_stdpathconf(ap); 4564 break; 4565 } 4566 return (error); 4567 } 4568