1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from nfs_vnops.c 8.16 (Berkeley) 5/27/95 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 /* 41 * vnode op calls for Sun NFS version 2, 3 and 4 42 */ 43 44 #include "opt_inet.h" 45 46 #include <sys/param.h> 47 #include <sys/kernel.h> 48 #include <sys/systm.h> 49 #include <sys/resourcevar.h> 50 #include <sys/proc.h> 51 #include <sys/mount.h> 52 #include <sys/bio.h> 53 #include <sys/buf.h> 54 #include <sys/extattr.h> 55 #include <sys/filio.h> 56 #include <sys/jail.h> 57 #include <sys/malloc.h> 58 #include <sys/mbuf.h> 59 #include <sys/namei.h> 60 #include <sys/socket.h> 61 #include <sys/vnode.h> 62 #include <sys/dirent.h> 63 #include <sys/fcntl.h> 64 #include <sys/lockf.h> 65 #include <sys/stat.h> 66 #include <sys/sysctl.h> 67 #include <sys/signalvar.h> 68 69 #include <vm/vm.h> 70 #include <vm/vm_extern.h> 71 #include <vm/vm_object.h> 72 73 #include <fs/nfs/nfsport.h> 74 #include <fs/nfsclient/nfsnode.h> 75 #include <fs/nfsclient/nfsmount.h> 76 #include <fs/nfsclient/nfs.h> 77 #include <fs/nfsclient/nfs_kdtrace.h> 78 79 #include <net/if.h> 80 #include <netinet/in.h> 81 #include <netinet/in_var.h> 82 83 #include <nfs/nfs_lock.h> 84 85 #ifdef KDTRACE_HOOKS 86 #include <sys/dtrace_bsd.h> 87 88 dtrace_nfsclient_accesscache_flush_probe_func_t 89 dtrace_nfscl_accesscache_flush_done_probe; 90 uint32_t nfscl_accesscache_flush_done_id; 91 92 dtrace_nfsclient_accesscache_get_probe_func_t 93 dtrace_nfscl_accesscache_get_hit_probe, 94 dtrace_nfscl_accesscache_get_miss_probe; 95 uint32_t nfscl_accesscache_get_hit_id; 96 uint32_t nfscl_accesscache_get_miss_id; 97 98 dtrace_nfsclient_accesscache_load_probe_func_t 99 dtrace_nfscl_accesscache_load_done_probe; 100 uint32_t nfscl_accesscache_load_done_id; 101 #endif /* !KDTRACE_HOOKS */ 102 103 /* Defs */ 104 #define TRUE 1 105 #define FALSE 0 106 107 extern struct nfsstatsv1 nfsstatsv1; 108 extern int nfsrv_useacl; 109 extern int nfscl_debuglevel; 110 MALLOC_DECLARE(M_NEWNFSREQ); 111 112 static vop_read_t nfsfifo_read; 113 static vop_write_t nfsfifo_write; 114 static vop_close_t nfsfifo_close; 115 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *, 116 struct thread *); 117 static vop_lookup_t nfs_lookup; 118 static vop_create_t nfs_create; 119 static vop_mknod_t nfs_mknod; 120 static vop_open_t nfs_open; 121 static vop_pathconf_t nfs_pathconf; 122 static vop_close_t nfs_close; 123 static vop_access_t nfs_access; 124 static vop_getattr_t nfs_getattr; 125 static vop_setattr_t nfs_setattr; 126 static vop_read_t nfs_read; 127 static vop_fsync_t nfs_fsync; 128 static vop_remove_t nfs_remove; 129 static vop_link_t nfs_link; 130 static vop_rename_t nfs_rename; 131 static vop_mkdir_t nfs_mkdir; 132 static vop_rmdir_t nfs_rmdir; 133 static vop_symlink_t nfs_symlink; 134 static vop_readdir_t nfs_readdir; 135 static vop_strategy_t nfs_strategy; 136 static int nfs_lookitup(struct vnode *, char *, int, 137 struct ucred *, struct thread *, struct nfsnode **); 138 static int nfs_sillyrename(struct vnode *, struct vnode *, 139 struct componentname *); 140 static vop_access_t nfsspec_access; 141 static vop_readlink_t nfs_readlink; 142 static vop_print_t nfs_print; 143 static vop_advlock_t nfs_advlock; 144 static vop_advlockasync_t nfs_advlockasync; 145 static vop_getacl_t nfs_getacl; 146 static vop_setacl_t nfs_setacl; 147 static vop_advise_t nfs_advise; 148 static vop_allocate_t nfs_allocate; 149 static vop_deallocate_t nfs_deallocate; 150 static vop_copy_file_range_t nfs_copy_file_range; 151 static vop_ioctl_t nfs_ioctl; 152 static vop_getextattr_t nfs_getextattr; 153 static vop_setextattr_t nfs_setextattr; 154 static vop_listextattr_t nfs_listextattr; 155 static vop_deleteextattr_t nfs_deleteextattr; 156 static vop_lock1_t nfs_lock; 157 158 /* 159 * Global vfs data structures for nfs 160 */ 161 162 static struct vop_vector newnfs_vnodeops_nosig = { 163 .vop_default = &default_vnodeops, 164 .vop_access = nfs_access, 165 .vop_advlock = nfs_advlock, 166 .vop_advlockasync = nfs_advlockasync, 167 .vop_close = nfs_close, 168 .vop_create = nfs_create, 169 .vop_fsync = nfs_fsync, 170 .vop_getattr = nfs_getattr, 171 .vop_getpages = ncl_getpages, 172 .vop_putpages = ncl_putpages, 173 .vop_inactive = ncl_inactive, 174 .vop_link = nfs_link, 175 .vop_lock1 = nfs_lock, 176 .vop_lookup = nfs_lookup, 177 .vop_mkdir = nfs_mkdir, 178 .vop_mknod = nfs_mknod, 179 .vop_open = nfs_open, 180 .vop_pathconf = nfs_pathconf, 181 .vop_print = nfs_print, 182 .vop_read = nfs_read, 183 .vop_readdir = nfs_readdir, 184 .vop_readlink = nfs_readlink, 185 .vop_reclaim = ncl_reclaim, 186 .vop_remove = nfs_remove, 187 .vop_rename = nfs_rename, 188 .vop_rmdir = nfs_rmdir, 189 .vop_setattr = nfs_setattr, 190 .vop_strategy = nfs_strategy, 191 .vop_symlink = nfs_symlink, 192 .vop_write = ncl_write, 193 .vop_getacl = nfs_getacl, 194 .vop_setacl = nfs_setacl, 195 .vop_advise = nfs_advise, 196 .vop_allocate = nfs_allocate, 197 .vop_deallocate = nfs_deallocate, 198 .vop_copy_file_range = nfs_copy_file_range, 199 .vop_ioctl = nfs_ioctl, 200 .vop_getextattr = nfs_getextattr, 201 .vop_setextattr = nfs_setextattr, 202 .vop_listextattr = nfs_listextattr, 203 .vop_deleteextattr = nfs_deleteextattr, 204 }; 205 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops_nosig); 206 207 static int 208 nfs_vnodeops_bypass(struct vop_generic_args *a) 209 { 210 211 return (vop_sigdefer(&newnfs_vnodeops_nosig, a)); 212 } 213 214 struct vop_vector newnfs_vnodeops = { 215 .vop_default = &default_vnodeops, 216 .vop_bypass = nfs_vnodeops_bypass, 217 }; 218 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops); 219 220 static struct vop_vector newnfs_fifoops_nosig = { 221 .vop_default = &fifo_specops, 222 .vop_access = nfsspec_access, 223 .vop_close = nfsfifo_close, 224 .vop_fsync = nfs_fsync, 225 .vop_getattr = nfs_getattr, 226 .vop_inactive = ncl_inactive, 227 .vop_pathconf = nfs_pathconf, 228 .vop_print = nfs_print, 229 .vop_read = nfsfifo_read, 230 .vop_reclaim = ncl_reclaim, 231 .vop_setattr = nfs_setattr, 232 .vop_write = nfsfifo_write, 233 }; 234 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops_nosig); 235 236 static int 237 nfs_fifoops_bypass(struct vop_generic_args *a) 238 { 239 240 return (vop_sigdefer(&newnfs_fifoops_nosig, a)); 241 } 242 243 struct vop_vector newnfs_fifoops = { 244 .vop_default = &default_vnodeops, 245 .vop_bypass = nfs_fifoops_bypass, 246 }; 247 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops); 248 249 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 250 struct componentname *cnp, struct vattr *vap); 251 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 252 int namelen, struct ucred *cred, struct thread *td); 253 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, 254 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp, 255 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td); 256 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp, 257 struct componentname *scnp, struct sillyrename *sp); 258 259 /* 260 * Global variables 261 */ 262 SYSCTL_DECL(_vfs_nfs); 263 264 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 265 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 266 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 267 268 static int nfs_prime_access_cache = 0; 269 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW, 270 &nfs_prime_access_cache, 0, 271 "Prime NFS ACCESS cache when fetching attributes"); 272 273 static int newnfs_commit_on_close = 0; 274 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW, 275 &newnfs_commit_on_close, 0, "write+commit on close, else only write"); 276 277 static int nfs_clean_pages_on_close = 1; 278 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, 279 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); 280 281 int newnfs_directio_enable = 0; 282 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 283 &newnfs_directio_enable, 0, "Enable NFS directio"); 284 285 int nfs_keep_dirty_on_error; 286 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW, 287 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned"); 288 289 /* 290 * This sysctl allows other processes to mmap a file that has been opened 291 * O_DIRECT by a process. In general, having processes mmap the file while 292 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 293 * this by default to prevent DoS attacks - to prevent a malicious user from 294 * opening up files O_DIRECT preventing other users from mmap'ing these 295 * files. "Protected" environments where stricter consistency guarantees are 296 * required can disable this knob. The process that opened the file O_DIRECT 297 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 298 * meaningful. 299 */ 300 int newnfs_directio_allow_mmap = 1; 301 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 302 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 303 304 static uint64_t nfs_maxalloclen = 64 * 1024 * 1024; 305 SYSCTL_U64(_vfs_nfs, OID_AUTO, maxalloclen, CTLFLAG_RW, 306 &nfs_maxalloclen, 0, "NFS max allocate/deallocate length"); 307 308 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \ 309 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \ 310 | NFSACCESS_DELETE | NFSACCESS_LOOKUP) 311 312 /* 313 * SMP Locking Note : 314 * The list of locks after the description of the lock is the ordering 315 * of other locks acquired with the lock held. 316 * np->n_mtx : Protects the fields in the nfsnode. 317 VM Object Lock 318 VI_MTX (acquired indirectly) 319 * nmp->nm_mtx : Protects the fields in the nfsmount. 320 rep->r_mtx 321 * ncl_iod_mutex : Global lock, protects shared nfsiod state. 322 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. 323 nmp->nm_mtx 324 rep->r_mtx 325 * rep->r_mtx : Protects the fields in an nfsreq. 326 */ 327 328 static int 329 nfs_lock(struct vop_lock1_args *ap) 330 { 331 struct vnode *vp; 332 struct nfsnode *np; 333 u_quad_t nsize; 334 int error, lktype; 335 bool onfault; 336 337 vp = ap->a_vp; 338 lktype = ap->a_flags & LK_TYPE_MASK; 339 error = VOP_LOCK1_APV(&default_vnodeops, ap); 340 if (error != 0 || vp->v_op != &newnfs_vnodeops) 341 return (error); 342 np = VTONFS(vp); 343 if (np == NULL) 344 return (0); 345 NFSLOCKNODE(np); 346 if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED && 347 lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE && 348 lktype != LK_TRYUPGRADE)) { 349 NFSUNLOCKNODE(np); 350 return (0); 351 } 352 onfault = (ap->a_flags & LK_EATTR_MASK) == LK_NOWAIT && 353 (ap->a_flags & LK_INIT_MASK) == LK_CANRECURSE && 354 (lktype == LK_SHARED || lktype == LK_EXCLUSIVE); 355 if (onfault && vp->v_vnlock->lk_recurse == 0) { 356 /* 357 * Force retry in vm_fault(), to make the lock request 358 * sleepable, which allows us to piggy-back the 359 * sleepable call to vnode_pager_setsize(). 360 */ 361 NFSUNLOCKNODE(np); 362 VOP_UNLOCK(vp); 363 return (EBUSY); 364 } 365 if ((ap->a_flags & LK_NOWAIT) != 0 || 366 (lktype == LK_SHARED && vp->v_vnlock->lk_recurse > 0)) { 367 NFSUNLOCKNODE(np); 368 return (0); 369 } 370 if (lktype == LK_SHARED) { 371 NFSUNLOCKNODE(np); 372 VOP_UNLOCK(vp); 373 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 374 ap->a_flags |= LK_EXCLUSIVE; 375 error = VOP_LOCK1_APV(&default_vnodeops, ap); 376 if (error != 0 || vp->v_op != &newnfs_vnodeops) 377 return (error); 378 if (vp->v_data == NULL) 379 goto downgrade; 380 MPASS(vp->v_data == np); 381 NFSLOCKNODE(np); 382 if ((np->n_flag & NVNSETSZSKIP) == 0) { 383 NFSUNLOCKNODE(np); 384 goto downgrade; 385 } 386 } 387 np->n_flag &= ~NVNSETSZSKIP; 388 nsize = np->n_size; 389 NFSUNLOCKNODE(np); 390 vnode_pager_setsize(vp, nsize); 391 downgrade: 392 if (lktype == LK_SHARED) { 393 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 394 ap->a_flags |= LK_DOWNGRADE; 395 (void)VOP_LOCK1_APV(&default_vnodeops, ap); 396 } 397 return (0); 398 } 399 400 static int 401 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td, 402 struct ucred *cred, u_int32_t *retmode) 403 { 404 int error = 0, attrflag, i, lrupos; 405 u_int32_t rmode; 406 struct nfsnode *np = VTONFS(vp); 407 struct nfsvattr nfsva; 408 409 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag, 410 &rmode); 411 if (attrflag) 412 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 413 if (!error) { 414 lrupos = 0; 415 NFSLOCKNODE(np); 416 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 417 if (np->n_accesscache[i].uid == cred->cr_uid) { 418 np->n_accesscache[i].mode = rmode; 419 np->n_accesscache[i].stamp = time_second; 420 break; 421 } 422 if (i > 0 && np->n_accesscache[i].stamp < 423 np->n_accesscache[lrupos].stamp) 424 lrupos = i; 425 } 426 if (i == NFS_ACCESSCACHESIZE) { 427 np->n_accesscache[lrupos].uid = cred->cr_uid; 428 np->n_accesscache[lrupos].mode = rmode; 429 np->n_accesscache[lrupos].stamp = time_second; 430 } 431 NFSUNLOCKNODE(np); 432 if (retmode != NULL) 433 *retmode = rmode; 434 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0); 435 } else if (NFS_ISV4(vp)) { 436 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 437 } 438 #ifdef KDTRACE_HOOKS 439 if (error != 0) 440 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0, 441 error); 442 #endif 443 return (error); 444 } 445 446 /* 447 * nfs access vnode op. 448 * For nfs version 2, just return ok. File accesses may fail later. 449 * For nfs version 3, use the access rpc to check accessibility. If file modes 450 * are changed on the server, accesses might still fail later. 451 */ 452 static int 453 nfs_access(struct vop_access_args *ap) 454 { 455 struct vnode *vp = ap->a_vp; 456 int error = 0, i, gotahit; 457 u_int32_t mode, wmode, rmode; 458 int v34 = NFS_ISV34(vp); 459 struct nfsnode *np = VTONFS(vp); 460 461 /* 462 * Disallow write attempts on filesystems mounted read-only; 463 * unless the file is a socket, fifo, or a block or character 464 * device resident on the filesystem. 465 */ 466 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS | 467 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL | 468 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { 469 switch (vp->v_type) { 470 case VREG: 471 case VDIR: 472 case VLNK: 473 return (EROFS); 474 default: 475 break; 476 } 477 } 478 /* 479 * For nfs v3 or v4, check to see if we have done this recently, and if 480 * so return our cached result instead of making an ACCESS call. 481 * If not, do an access rpc, otherwise you are stuck emulating 482 * ufs_access() locally using the vattr. This may not be correct, 483 * since the server may apply other access criteria such as 484 * client uid-->server uid mapping that we do not know about. 485 */ 486 if (v34) { 487 if (ap->a_accmode & VREAD) 488 mode = NFSACCESS_READ; 489 else 490 mode = 0; 491 if (vp->v_type != VDIR) { 492 if (ap->a_accmode & VWRITE) 493 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 494 if (ap->a_accmode & VAPPEND) 495 mode |= NFSACCESS_EXTEND; 496 if (ap->a_accmode & VEXEC) 497 mode |= NFSACCESS_EXECUTE; 498 if (ap->a_accmode & VDELETE) 499 mode |= NFSACCESS_DELETE; 500 } else { 501 if (ap->a_accmode & VWRITE) 502 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 503 if (ap->a_accmode & VAPPEND) 504 mode |= NFSACCESS_EXTEND; 505 if (ap->a_accmode & VEXEC) 506 mode |= NFSACCESS_LOOKUP; 507 if (ap->a_accmode & VDELETE) 508 mode |= NFSACCESS_DELETE; 509 if (ap->a_accmode & VDELETE_CHILD) 510 mode |= NFSACCESS_MODIFY; 511 } 512 /* XXX safety belt, only make blanket request if caching */ 513 if (nfsaccess_cache_timeout > 0) { 514 wmode = NFSACCESS_READ | NFSACCESS_MODIFY | 515 NFSACCESS_EXTEND | NFSACCESS_EXECUTE | 516 NFSACCESS_DELETE | NFSACCESS_LOOKUP; 517 } else { 518 wmode = mode; 519 } 520 521 /* 522 * Does our cached result allow us to give a definite yes to 523 * this request? 524 */ 525 gotahit = 0; 526 NFSLOCKNODE(np); 527 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 528 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) { 529 if (time_second < (np->n_accesscache[i].stamp 530 + nfsaccess_cache_timeout) && 531 (np->n_accesscache[i].mode & mode) == mode) { 532 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits); 533 gotahit = 1; 534 } 535 break; 536 } 537 } 538 NFSUNLOCKNODE(np); 539 #ifdef KDTRACE_HOOKS 540 if (gotahit != 0) 541 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp, 542 ap->a_cred->cr_uid, mode); 543 else 544 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp, 545 ap->a_cred->cr_uid, mode); 546 #endif 547 if (gotahit == 0) { 548 /* 549 * Either a no, or a don't know. Go to the wire. 550 */ 551 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 552 error = nfs34_access_otw(vp, wmode, ap->a_td, 553 ap->a_cred, &rmode); 554 if (!error && 555 (rmode & mode) != mode) 556 error = EACCES; 557 } 558 return (error); 559 } else { 560 if ((error = nfsspec_access(ap)) != 0) { 561 return (error); 562 } 563 /* 564 * Attempt to prevent a mapped root from accessing a file 565 * which it shouldn't. We try to read a byte from the file 566 * if the user is root and the file is not zero length. 567 * After calling nfsspec_access, we should have the correct 568 * file size cached. 569 */ 570 NFSLOCKNODE(np); 571 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD) 572 && VTONFS(vp)->n_size > 0) { 573 struct iovec aiov; 574 struct uio auio; 575 char buf[1]; 576 577 NFSUNLOCKNODE(np); 578 aiov.iov_base = buf; 579 aiov.iov_len = 1; 580 auio.uio_iov = &aiov; 581 auio.uio_iovcnt = 1; 582 auio.uio_offset = 0; 583 auio.uio_resid = 1; 584 auio.uio_segflg = UIO_SYSSPACE; 585 auio.uio_rw = UIO_READ; 586 auio.uio_td = ap->a_td; 587 588 if (vp->v_type == VREG) 589 error = ncl_readrpc(vp, &auio, ap->a_cred); 590 else if (vp->v_type == VDIR) { 591 char* bp; 592 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 593 aiov.iov_base = bp; 594 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 595 error = ncl_readdirrpc(vp, &auio, ap->a_cred, 596 ap->a_td); 597 free(bp, M_TEMP); 598 } else if (vp->v_type == VLNK) 599 error = ncl_readlinkrpc(vp, &auio, ap->a_cred); 600 else 601 error = EACCES; 602 } else 603 NFSUNLOCKNODE(np); 604 return (error); 605 } 606 } 607 608 /* 609 * nfs open vnode op 610 * Check to see if the type is ok 611 * and that deletion is not in progress. 612 * For paged in text files, you will need to flush the page cache 613 * if consistency is lost. 614 */ 615 /* ARGSUSED */ 616 static int 617 nfs_open(struct vop_open_args *ap) 618 { 619 struct vnode *vp = ap->a_vp; 620 struct nfsnode *np = VTONFS(vp); 621 struct vattr vattr; 622 int error; 623 int fmode = ap->a_mode; 624 struct ucred *cred; 625 vm_object_t obj; 626 627 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 628 return (EOPNOTSUPP); 629 630 /* 631 * For NFSv4, we need to do the Open Op before cache validation, 632 * so that we conform to RFC3530 Sec. 9.3.1. 633 */ 634 if (NFS_ISV4(vp)) { 635 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td); 636 if (error) { 637 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 638 (gid_t)0); 639 return (error); 640 } 641 } 642 643 /* 644 * Now, if this Open will be doing reading, re-validate/flush the 645 * cache, so that Close/Open coherency is maintained. 646 */ 647 NFSLOCKNODE(np); 648 if (np->n_flag & NMODIFIED) { 649 NFSUNLOCKNODE(np); 650 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 651 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 652 if (VN_IS_DOOMED(vp)) 653 return (EBADF); 654 } 655 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 656 if (error == EINTR || error == EIO) { 657 if (NFS_ISV4(vp)) 658 (void) nfsrpc_close(vp, 0, ap->a_td); 659 return (error); 660 } 661 NFSLOCKNODE(np); 662 np->n_attrstamp = 0; 663 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 664 if (vp->v_type == VDIR) 665 np->n_direofoffset = 0; 666 NFSUNLOCKNODE(np); 667 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 668 if (error) { 669 if (NFS_ISV4(vp)) 670 (void) nfsrpc_close(vp, 0, ap->a_td); 671 return (error); 672 } 673 NFSLOCKNODE(np); 674 np->n_mtime = vattr.va_mtime; 675 if (NFS_ISV4(vp)) 676 np->n_change = vattr.va_filerev; 677 } else { 678 NFSUNLOCKNODE(np); 679 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 680 if (error) { 681 if (NFS_ISV4(vp)) 682 (void) nfsrpc_close(vp, 0, ap->a_td); 683 return (error); 684 } 685 NFSLOCKNODE(np); 686 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) || 687 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 688 if (vp->v_type == VDIR) 689 np->n_direofoffset = 0; 690 NFSUNLOCKNODE(np); 691 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 692 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 693 if (VN_IS_DOOMED(vp)) 694 return (EBADF); 695 } 696 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 697 if (error == EINTR || error == EIO) { 698 if (NFS_ISV4(vp)) 699 (void) nfsrpc_close(vp, 0, ap->a_td); 700 return (error); 701 } 702 NFSLOCKNODE(np); 703 np->n_mtime = vattr.va_mtime; 704 if (NFS_ISV4(vp)) 705 np->n_change = vattr.va_filerev; 706 } 707 } 708 709 /* 710 * If the object has >= 1 O_DIRECT active opens, we disable caching. 711 */ 712 if (newnfs_directio_enable && (fmode & O_DIRECT) && 713 (vp->v_type == VREG)) { 714 if (np->n_directio_opens == 0) { 715 NFSUNLOCKNODE(np); 716 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 717 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 718 if (VN_IS_DOOMED(vp)) 719 return (EBADF); 720 } 721 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 722 if (error) { 723 if (NFS_ISV4(vp)) 724 (void) nfsrpc_close(vp, 0, ap->a_td); 725 return (error); 726 } 727 NFSLOCKNODE(np); 728 np->n_flag |= NNONCACHE; 729 } 730 np->n_directio_opens++; 731 } 732 733 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */ 734 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0) 735 np->n_flag |= NWRITEOPENED; 736 737 /* 738 * If this is an open for writing, capture a reference to the 739 * credentials, so they can be used by ncl_putpages(). Using 740 * these write credentials is preferable to the credentials of 741 * whatever thread happens to be doing the VOP_PUTPAGES() since 742 * the write RPCs are less likely to fail with EACCES. 743 */ 744 if ((fmode & FWRITE) != 0) { 745 cred = np->n_writecred; 746 np->n_writecred = crhold(ap->a_cred); 747 } else 748 cred = NULL; 749 NFSUNLOCKNODE(np); 750 751 if (cred != NULL) 752 crfree(cred); 753 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 754 755 /* 756 * If the text file has been mmap'd, flush any dirty pages to the 757 * buffer cache and then... 758 * Make sure all writes are pushed to the NFS server. If this is not 759 * done, the modify time of the file can change while the text 760 * file is being executed. This will cause the process that is 761 * executing the text file to be terminated. 762 */ 763 if (vp->v_writecount <= -1) { 764 if ((obj = vp->v_object) != NULL && 765 vm_object_mightbedirty(obj)) { 766 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 767 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 768 if (VN_IS_DOOMED(vp)) 769 return (EBADF); 770 } 771 VM_OBJECT_WLOCK(obj); 772 vm_object_page_clean(obj, 0, 0, OBJPC_SYNC); 773 VM_OBJECT_WUNLOCK(obj); 774 } 775 776 /* Now, flush the buffer cache. */ 777 ncl_flush(vp, MNT_WAIT, curthread, 0, 0); 778 779 /* And, finally, make sure that n_mtime is up to date. */ 780 np = VTONFS(vp); 781 NFSLOCKNODE(np); 782 np->n_mtime = np->n_vattr.na_mtime; 783 NFSUNLOCKNODE(np); 784 } 785 return (0); 786 } 787 788 /* 789 * nfs close vnode op 790 * What an NFS client should do upon close after writing is a debatable issue. 791 * Most NFS clients push delayed writes to the server upon close, basically for 792 * two reasons: 793 * 1 - So that any write errors may be reported back to the client process 794 * doing the close system call. By far the two most likely errors are 795 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 796 * 2 - To put a worst case upper bound on cache inconsistency between 797 * multiple clients for the file. 798 * There is also a consistency problem for Version 2 of the protocol w.r.t. 799 * not being able to tell if other clients are writing a file concurrently, 800 * since there is no way of knowing if the changed modify time in the reply 801 * is only due to the write for this client. 802 * (NFS Version 3 provides weak cache consistency data in the reply that 803 * should be sufficient to detect and handle this case.) 804 * 805 * The current code does the following: 806 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 807 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 808 * or commit them (this satisfies 1 and 2 except for the 809 * case where the server crashes after this close but 810 * before the commit RPC, which is felt to be "good 811 * enough". Changing the last argument to ncl_flush() to 812 * a 1 would force a commit operation, if it is felt a 813 * commit is necessary now. 814 * for NFS Version 4 - flush the dirty buffers and commit them, if 815 * nfscl_mustflush() says this is necessary. 816 * It is necessary if there is no write delegation held, 817 * in order to satisfy open/close coherency. 818 * If the file isn't cached on local stable storage, 819 * it may be necessary in order to detect "out of space" 820 * errors from the server, if the write delegation 821 * issued by the server doesn't allow the file to grow. 822 */ 823 /* ARGSUSED */ 824 static int 825 nfs_close(struct vop_close_args *ap) 826 { 827 struct vnode *vp = ap->a_vp; 828 struct nfsnode *np = VTONFS(vp); 829 struct nfsvattr nfsva; 830 struct ucred *cred; 831 int error = 0, ret, localcred = 0; 832 int fmode = ap->a_fflag; 833 834 if (NFSCL_FORCEDISM(vp->v_mount)) 835 return (0); 836 /* 837 * During shutdown, a_cred isn't valid, so just use root. 838 */ 839 if (ap->a_cred == NOCRED) { 840 cred = newnfs_getcred(); 841 localcred = 1; 842 } else { 843 cred = ap->a_cred; 844 } 845 if (vp->v_type == VREG) { 846 /* 847 * Examine and clean dirty pages, regardless of NMODIFIED. 848 * This closes a major hole in close-to-open consistency. 849 * We want to push out all dirty pages (and buffers) on 850 * close, regardless of whether they were dirtied by 851 * mmap'ed writes or via write(). 852 */ 853 if (nfs_clean_pages_on_close && vp->v_object) { 854 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 855 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 856 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK) 857 return (EBADF); 858 } 859 VM_OBJECT_WLOCK(vp->v_object); 860 vm_object_page_clean(vp->v_object, 0, 0, 0); 861 VM_OBJECT_WUNLOCK(vp->v_object); 862 } 863 NFSLOCKNODE(np); 864 if (np->n_flag & NMODIFIED) { 865 NFSUNLOCKNODE(np); 866 if (NFS_ISV3(vp)) { 867 /* 868 * Under NFSv3 we have dirty buffers to dispose of. We 869 * must flush them to the NFS server. We have the option 870 * of waiting all the way through the commit rpc or just 871 * waiting for the initial write. The default is to only 872 * wait through the initial write so the data is in the 873 * server's cache, which is roughly similar to the state 874 * a standard disk subsystem leaves the file in on close(). 875 * 876 * We cannot clear the NMODIFIED bit in np->n_flag due to 877 * potential races with other processes, and certainly 878 * cannot clear it if we don't commit. 879 * These races occur when there is no longer the old 880 * traditional vnode locking implemented for Vnode Ops. 881 */ 882 int cm = newnfs_commit_on_close ? 1 : 0; 883 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 884 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 885 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK) 886 return (EBADF); 887 } 888 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0); 889 /* np->n_flag &= ~NMODIFIED; */ 890 } else if (NFS_ISV4(vp)) { 891 if (nfscl_mustflush(vp) != 0) { 892 int cm = newnfs_commit_on_close ? 1 : 0; 893 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 894 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 895 if (VN_IS_DOOMED(vp) && ap->a_fflag != 896 FNONBLOCK) 897 return (EBADF); 898 } 899 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 900 cm, 0); 901 /* 902 * as above w.r.t races when clearing 903 * NMODIFIED. 904 * np->n_flag &= ~NMODIFIED; 905 */ 906 } 907 } else { 908 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 909 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 910 if (VN_IS_DOOMED(vp) && ap->a_fflag != 911 FNONBLOCK) 912 return (EBADF); 913 } 914 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 915 } 916 NFSLOCKNODE(np); 917 } 918 /* 919 * Invalidate the attribute cache in all cases. 920 * An open is going to fetch fresh attrs any way, other procs 921 * on this node that have file open will be forced to do an 922 * otw attr fetch, but this is safe. 923 * --> A user found that their RPC count dropped by 20% when 924 * this was commented out and I can't see any requirement 925 * for it, so I've disabled it when negative lookups are 926 * enabled. (What does this have to do with negative lookup 927 * caching? Well nothing, except it was reported by the 928 * same user that needed negative lookup caching and I wanted 929 * there to be a way to disable it to see if it 930 * is the cause of some caching/coherency issue that might 931 * crop up.) 932 */ 933 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) { 934 np->n_attrstamp = 0; 935 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 936 } 937 if (np->n_flag & NWRITEERR) { 938 np->n_flag &= ~NWRITEERR; 939 error = np->n_error; 940 } 941 NFSUNLOCKNODE(np); 942 } 943 944 if (NFS_ISV4(vp)) { 945 /* 946 * Get attributes so "change" is up to date. 947 */ 948 if (error == 0 && nfscl_mustflush(vp) != 0 && 949 vp->v_type == VREG && 950 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) { 951 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva); 952 if (!ret) { 953 np->n_change = nfsva.na_filerev; 954 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 955 0, 0); 956 } 957 } 958 959 /* 960 * and do the close. 961 */ 962 ret = nfsrpc_close(vp, 0, ap->a_td); 963 if (!error && ret) 964 error = ret; 965 if (error) 966 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 967 (gid_t)0); 968 } 969 if (newnfs_directio_enable) 970 KASSERT((np->n_directio_asyncwr == 0), 971 ("nfs_close: dirty unflushed (%d) directio buffers\n", 972 np->n_directio_asyncwr)); 973 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 974 NFSLOCKNODE(np); 975 KASSERT((np->n_directio_opens > 0), 976 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 977 np->n_directio_opens--; 978 if (np->n_directio_opens == 0) 979 np->n_flag &= ~NNONCACHE; 980 NFSUNLOCKNODE(np); 981 } 982 if (localcred) 983 NFSFREECRED(cred); 984 return (error); 985 } 986 987 /* 988 * nfs getattr call from vfs. 989 */ 990 static int 991 nfs_getattr(struct vop_getattr_args *ap) 992 { 993 struct vnode *vp = ap->a_vp; 994 struct thread *td = curthread; /* XXX */ 995 struct nfsnode *np = VTONFS(vp); 996 int error = 0; 997 struct nfsvattr nfsva; 998 struct vattr *vap = ap->a_vap; 999 struct vattr vattr; 1000 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 */ 1011 if (ncl_getattrcache(vp, &vattr) == 0) { 1012 ncl_copy_vattr(vap, &vattr); 1013 1014 /* 1015 * Get the local modify time for the case of a write 1016 * delegation. 1017 */ 1018 nfscl_deleggetmodtime(vp, &vap->va_mtime); 1019 return (0); 1020 } 1021 1022 if (NFS_ISV34(vp) && nfs_prime_access_cache && 1023 nfsaccess_cache_timeout > 0) { 1024 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 1025 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL); 1026 if (ncl_getattrcache(vp, ap->a_vap) == 0) { 1027 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime); 1028 return (0); 1029 } 1030 } 1031 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva); 1032 if (!error) 1033 error = nfscl_loadattrcache(&vp, &nfsva, vap, 0, 0); 1034 if (!error) { 1035 /* 1036 * Get the local modify time for the case of a write 1037 * delegation. 1038 */ 1039 nfscl_deleggetmodtime(vp, &vap->va_mtime); 1040 } else if (NFS_ISV4(vp)) { 1041 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1042 } 1043 return (error); 1044 } 1045 1046 /* 1047 * nfs setattr call. 1048 */ 1049 static int 1050 nfs_setattr(struct vop_setattr_args *ap) 1051 { 1052 struct vnode *vp = ap->a_vp; 1053 struct nfsnode *np = VTONFS(vp); 1054 struct thread *td = curthread; /* XXX */ 1055 struct vattr *vap = ap->a_vap; 1056 int error = 0; 1057 u_quad_t tsize; 1058 struct timespec ts; 1059 1060 #ifndef nolint 1061 tsize = (u_quad_t)0; 1062 #endif 1063 1064 /* 1065 * Setting of flags and marking of atimes are not supported. 1066 */ 1067 if (vap->va_flags != VNOVAL) 1068 return (EOPNOTSUPP); 1069 1070 /* 1071 * Disallow write attempts if the filesystem is mounted read-only. 1072 */ 1073 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 1074 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 1075 vap->va_mtime.tv_sec != VNOVAL || 1076 vap->va_birthtime.tv_sec != VNOVAL || 1077 vap->va_mode != (mode_t)VNOVAL) && 1078 (vp->v_mount->mnt_flag & MNT_RDONLY)) 1079 return (EROFS); 1080 if (vap->va_size != VNOVAL) { 1081 switch (vp->v_type) { 1082 case VDIR: 1083 return (EISDIR); 1084 case VCHR: 1085 case VBLK: 1086 case VSOCK: 1087 case VFIFO: 1088 if (vap->va_mtime.tv_sec == VNOVAL && 1089 vap->va_atime.tv_sec == VNOVAL && 1090 vap->va_birthtime.tv_sec == VNOVAL && 1091 vap->va_mode == (mode_t)VNOVAL && 1092 vap->va_uid == (uid_t)VNOVAL && 1093 vap->va_gid == (gid_t)VNOVAL) 1094 return (0); 1095 vap->va_size = VNOVAL; 1096 break; 1097 default: 1098 /* 1099 * Disallow write attempts if the filesystem is 1100 * mounted read-only. 1101 */ 1102 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1103 return (EROFS); 1104 /* 1105 * We run vnode_pager_setsize() early (why?), 1106 * we must set np->n_size now to avoid vinvalbuf 1107 * V_SAVE races that might setsize a lower 1108 * value. 1109 */ 1110 NFSLOCKNODE(np); 1111 tsize = np->n_size; 1112 NFSUNLOCKNODE(np); 1113 error = ncl_meta_setsize(vp, td, vap->va_size); 1114 NFSLOCKNODE(np); 1115 if (np->n_flag & NMODIFIED) { 1116 tsize = np->n_size; 1117 NFSUNLOCKNODE(np); 1118 error = ncl_vinvalbuf(vp, vap->va_size == 0 ? 1119 0 : V_SAVE, td, 1); 1120 if (error != 0) { 1121 vnode_pager_setsize(vp, tsize); 1122 return (error); 1123 } 1124 /* 1125 * Call nfscl_delegmodtime() to set the modify time 1126 * locally, as required. 1127 */ 1128 nfscl_delegmodtime(vp); 1129 } else 1130 NFSUNLOCKNODE(np); 1131 /* 1132 * np->n_size has already been set to vap->va_size 1133 * in ncl_meta_setsize(). We must set it again since 1134 * nfs_loadattrcache() could be called through 1135 * ncl_meta_setsize() and could modify np->n_size. 1136 */ 1137 NFSLOCKNODE(np); 1138 np->n_vattr.na_size = np->n_size = vap->va_size; 1139 NFSUNLOCKNODE(np); 1140 } 1141 } else { 1142 NFSLOCKNODE(np); 1143 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 1144 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 1145 NFSUNLOCKNODE(np); 1146 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 1147 if (error == EINTR || error == EIO) 1148 return (error); 1149 } else 1150 NFSUNLOCKNODE(np); 1151 } 1152 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 1153 if (vap->va_size != VNOVAL) { 1154 if (error == 0) { 1155 nanouptime(&ts); 1156 NFSLOCKNODE(np); 1157 np->n_localmodtime = ts; 1158 NFSUNLOCKNODE(np); 1159 } else { 1160 NFSLOCKNODE(np); 1161 np->n_size = np->n_vattr.na_size = tsize; 1162 vnode_pager_setsize(vp, tsize); 1163 NFSUNLOCKNODE(np); 1164 } 1165 } 1166 return (error); 1167 } 1168 1169 /* 1170 * Do an nfs setattr rpc. 1171 */ 1172 static int 1173 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 1174 struct thread *td) 1175 { 1176 struct nfsnode *np = VTONFS(vp); 1177 int error, ret, attrflag, i; 1178 struct nfsvattr nfsva; 1179 1180 if (NFS_ISV34(vp)) { 1181 NFSLOCKNODE(np); 1182 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) 1183 np->n_accesscache[i].stamp = 0; 1184 np->n_flag |= NDELEGMOD; 1185 NFSUNLOCKNODE(np); 1186 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); 1187 } 1188 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag); 1189 if (attrflag) { 1190 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 1191 if (ret && !error) 1192 error = ret; 1193 } 1194 if (error && NFS_ISV4(vp)) 1195 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid); 1196 return (error); 1197 } 1198 1199 /* 1200 * nfs lookup call, one step at a time... 1201 * First look in cache 1202 * If not found, unlock the directory nfsnode and do the rpc 1203 */ 1204 static int 1205 nfs_lookup(struct vop_lookup_args *ap) 1206 { 1207 struct componentname *cnp = ap->a_cnp; 1208 struct vnode *dvp = ap->a_dvp; 1209 struct vnode **vpp = ap->a_vpp; 1210 struct mount *mp = dvp->v_mount; 1211 int flags = cnp->cn_flags; 1212 struct vnode *newvp; 1213 struct nfsmount *nmp; 1214 struct nfsnode *np, *newnp; 1215 int error = 0, attrflag, dattrflag, ltype, ncticks; 1216 struct thread *td = curthread; 1217 struct nfsfh *nfhp; 1218 struct nfsvattr dnfsva, nfsva; 1219 struct vattr vattr; 1220 struct timespec nctime, ts; 1221 uint32_t openmode; 1222 1223 *vpp = NULLVP; 1224 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) && 1225 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 1226 return (EROFS); 1227 if (dvp->v_type != VDIR) 1228 return (ENOTDIR); 1229 nmp = VFSTONFS(mp); 1230 np = VTONFS(dvp); 1231 1232 /* For NFSv4, wait until any remove is done. */ 1233 NFSLOCKNODE(np); 1234 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) { 1235 np->n_flag |= NREMOVEWANT; 1236 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0); 1237 } 1238 NFSUNLOCKNODE(np); 1239 1240 error = vn_dir_check_exec(dvp, cnp); 1241 if (error != 0) 1242 return (error); 1243 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks); 1244 if (error > 0 && error != ENOENT) 1245 return (error); 1246 if (error == -1) { 1247 /* 1248 * Lookups of "." are special and always return the 1249 * current directory. cache_lookup() already handles 1250 * associated locking bookkeeping, etc. 1251 */ 1252 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 1253 /* XXX: Is this really correct? */ 1254 if (cnp->cn_nameiop != LOOKUP && 1255 (flags & ISLASTCN)) 1256 cnp->cn_flags |= SAVENAME; 1257 return (0); 1258 } 1259 1260 /* 1261 * We only accept a positive hit in the cache if the 1262 * change time of the file matches our cached copy. 1263 * Otherwise, we discard the cache entry and fallback 1264 * to doing a lookup RPC. We also only trust cache 1265 * entries for less than nm_nametimeo seconds. 1266 * 1267 * To better handle stale file handles and attributes, 1268 * clear the attribute cache of this node if it is a 1269 * leaf component, part of an open() call, and not 1270 * locally modified before fetching the attributes. 1271 * This should allow stale file handles to be detected 1272 * here where we can fall back to a LOOKUP RPC to 1273 * recover rather than having nfs_open() detect the 1274 * stale file handle and failing open(2) with ESTALE. 1275 */ 1276 newvp = *vpp; 1277 newnp = VTONFS(newvp); 1278 if (!(nmp->nm_flag & NFSMNT_NOCTO) && 1279 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1280 !(newnp->n_flag & NMODIFIED)) { 1281 NFSLOCKNODE(newnp); 1282 newnp->n_attrstamp = 0; 1283 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1284 NFSUNLOCKNODE(newnp); 1285 } 1286 if (nfscl_nodeleg(newvp, 0) == 0 || 1287 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) && 1288 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 && 1289 timespeccmp(&vattr.va_ctime, &nctime, ==))) { 1290 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1291 if (cnp->cn_nameiop != LOOKUP && 1292 (flags & ISLASTCN)) 1293 cnp->cn_flags |= SAVENAME; 1294 return (0); 1295 } 1296 cache_purge(newvp); 1297 if (dvp != newvp) 1298 vput(newvp); 1299 else 1300 vrele(newvp); 1301 *vpp = NULLVP; 1302 } else if (error == ENOENT) { 1303 if (VN_IS_DOOMED(dvp)) 1304 return (ENOENT); 1305 /* 1306 * We only accept a negative hit in the cache if the 1307 * modification time of the parent directory matches 1308 * the cached copy in the name cache entry. 1309 * Otherwise, we discard all of the negative cache 1310 * entries for this directory. We also only trust 1311 * negative cache entries for up to nm_negnametimeo 1312 * seconds. 1313 */ 1314 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) && 1315 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && 1316 timespeccmp(&vattr.va_mtime, &nctime, ==)) { 1317 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1318 return (ENOENT); 1319 } 1320 cache_purge_negative(dvp); 1321 } 1322 1323 openmode = 0; 1324 /* 1325 * If this an NFSv4.1/4.2 mount using the "oneopenown" mount 1326 * option, it is possible to do the Open operation in the same 1327 * compound as Lookup, so long as delegations are not being 1328 * issued. This saves doing a separate RPC for Open. 1329 * For pnfs, do not do this, since the Open+LayoutGet will 1330 * be needed as a separate RPC. 1331 */ 1332 NFSLOCKMNT(nmp); 1333 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp) && !NFSHASPNFS(nmp) && 1334 (nmp->nm_privflag & NFSMNTP_DELEGISSUED) == 0 && 1335 (!NFSMNT_RDONLY(mp) || (flags & OPENWRITE) == 0) && 1336 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN)) { 1337 if ((flags & OPENREAD) != 0) 1338 openmode |= NFSV4OPEN_ACCESSREAD; 1339 if ((flags & OPENWRITE) != 0) 1340 openmode |= NFSV4OPEN_ACCESSWRITE; 1341 } 1342 NFSUNLOCKMNT(nmp); 1343 1344 newvp = NULLVP; 1345 NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses); 1346 nanouptime(&ts); 1347 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1348 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1349 openmode); 1350 if (dattrflag) 1351 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 1352 if (error) { 1353 if (newvp != NULLVP) { 1354 vput(newvp); 1355 *vpp = NULLVP; 1356 } 1357 1358 if (error != ENOENT) { 1359 if (NFS_ISV4(dvp)) 1360 error = nfscl_maperr(td, error, (uid_t)0, 1361 (gid_t)0); 1362 return (error); 1363 } 1364 1365 /* The requested file was not found. */ 1366 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1367 (flags & ISLASTCN)) { 1368 /* 1369 * XXX: UFS does a full VOP_ACCESS(dvp, 1370 * VWRITE) here instead of just checking 1371 * MNT_RDONLY. 1372 */ 1373 if (mp->mnt_flag & MNT_RDONLY) 1374 return (EROFS); 1375 cnp->cn_flags |= SAVENAME; 1376 return (EJUSTRETURN); 1377 } 1378 1379 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) { 1380 /* 1381 * Cache the modification time of the parent 1382 * directory from the post-op attributes in 1383 * the name cache entry. The negative cache 1384 * entry will be ignored once the directory 1385 * has changed. Don't bother adding the entry 1386 * if the directory has already changed. 1387 */ 1388 NFSLOCKNODE(np); 1389 if (timespeccmp(&np->n_vattr.na_mtime, 1390 &dnfsva.na_mtime, ==)) { 1391 NFSUNLOCKNODE(np); 1392 cache_enter_time(dvp, NULL, cnp, 1393 &dnfsva.na_mtime, NULL); 1394 } else 1395 NFSUNLOCKNODE(np); 1396 } 1397 return (ENOENT); 1398 } 1399 1400 /* 1401 * Handle RENAME case... 1402 */ 1403 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 1404 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1405 free(nfhp, M_NFSFH); 1406 return (EISDIR); 1407 } 1408 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, LK_EXCLUSIVE); 1409 if (error) 1410 return (error); 1411 newvp = NFSTOV(np); 1412 /* 1413 * If n_localmodtime >= time before RPC, then 1414 * a file modification operation, such as 1415 * VOP_SETATTR() of size, has occurred while 1416 * the Lookup RPC and acquisition of the vnode 1417 * happened. As such, the attributes might 1418 * be stale, with possibly an incorrect size. 1419 */ 1420 NFSLOCKNODE(np); 1421 if (timespecisset(&np->n_localmodtime) && 1422 timespeccmp(&np->n_localmodtime, &ts, >=)) { 1423 NFSCL_DEBUG(4, "nfs_lookup: rename localmod " 1424 "stale attributes\n"); 1425 attrflag = 0; 1426 } 1427 NFSUNLOCKNODE(np); 1428 if (attrflag) 1429 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1430 *vpp = newvp; 1431 cnp->cn_flags |= SAVENAME; 1432 return (0); 1433 } 1434 1435 if (flags & ISDOTDOT) { 1436 ltype = NFSVOPISLOCKED(dvp); 1437 error = vfs_busy(mp, MBF_NOWAIT); 1438 if (error != 0) { 1439 vfs_ref(mp); 1440 NFSVOPUNLOCK(dvp); 1441 error = vfs_busy(mp, 0); 1442 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1443 vfs_rel(mp); 1444 if (error == 0 && VN_IS_DOOMED(dvp)) { 1445 vfs_unbusy(mp); 1446 error = ENOENT; 1447 } 1448 if (error != 0) 1449 return (error); 1450 } 1451 NFSVOPUNLOCK(dvp); 1452 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, 1453 cnp->cn_lkflags); 1454 if (error == 0) 1455 newvp = NFSTOV(np); 1456 vfs_unbusy(mp); 1457 if (newvp != dvp) 1458 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1459 if (VN_IS_DOOMED(dvp)) { 1460 if (error == 0) { 1461 if (newvp == dvp) 1462 vrele(newvp); 1463 else 1464 vput(newvp); 1465 } 1466 error = ENOENT; 1467 } 1468 if (error != 0) 1469 return (error); 1470 if (attrflag) 1471 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1472 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1473 free(nfhp, M_NFSFH); 1474 VREF(dvp); 1475 newvp = dvp; 1476 if (attrflag) 1477 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1478 } else { 1479 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, 1480 cnp->cn_lkflags); 1481 if (error) 1482 return (error); 1483 newvp = NFSTOV(np); 1484 /* 1485 * If n_localmodtime >= time before RPC, then 1486 * a file modification operation, such as 1487 * VOP_SETATTR() of size, has occurred while 1488 * the Lookup RPC and acquisition of the vnode 1489 * happened. As such, the attributes might 1490 * be stale, with possibly an incorrect size. 1491 */ 1492 NFSLOCKNODE(np); 1493 if (timespecisset(&np->n_localmodtime) && 1494 timespeccmp(&np->n_localmodtime, &ts, >=)) { 1495 NFSCL_DEBUG(4, "nfs_lookup: localmod " 1496 "stale attributes\n"); 1497 attrflag = 0; 1498 } 1499 NFSUNLOCKNODE(np); 1500 if (attrflag) 1501 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1502 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1503 !(np->n_flag & NMODIFIED)) { 1504 /* 1505 * Flush the attribute cache when opening a 1506 * leaf node to ensure that fresh attributes 1507 * are fetched in nfs_open() since we did not 1508 * fetch attributes from the LOOKUP reply. 1509 */ 1510 NFSLOCKNODE(np); 1511 np->n_attrstamp = 0; 1512 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1513 NFSUNLOCKNODE(np); 1514 } 1515 } 1516 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1517 cnp->cn_flags |= SAVENAME; 1518 if ((cnp->cn_flags & MAKEENTRY) && dvp != newvp && 1519 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) && 1520 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0)) 1521 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 1522 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime); 1523 *vpp = newvp; 1524 return (0); 1525 } 1526 1527 /* 1528 * nfs read call. 1529 * Just call ncl_bioread() to do the work. 1530 */ 1531 static int 1532 nfs_read(struct vop_read_args *ap) 1533 { 1534 struct vnode *vp = ap->a_vp; 1535 1536 switch (vp->v_type) { 1537 case VREG: 1538 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1539 case VDIR: 1540 return (EISDIR); 1541 default: 1542 return (EOPNOTSUPP); 1543 } 1544 } 1545 1546 /* 1547 * nfs readlink call 1548 */ 1549 static int 1550 nfs_readlink(struct vop_readlink_args *ap) 1551 { 1552 struct vnode *vp = ap->a_vp; 1553 1554 if (vp->v_type != VLNK) 1555 return (EINVAL); 1556 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1557 } 1558 1559 /* 1560 * Do a readlink rpc. 1561 * Called by ncl_doio() from below the buffer cache. 1562 */ 1563 int 1564 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1565 { 1566 int error, ret, attrflag; 1567 struct nfsvattr nfsva; 1568 1569 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva, 1570 &attrflag); 1571 if (attrflag) { 1572 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 1573 if (ret && !error) 1574 error = ret; 1575 } 1576 if (error && NFS_ISV4(vp)) 1577 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1578 return (error); 1579 } 1580 1581 /* 1582 * nfs read rpc call 1583 * Ditto above 1584 */ 1585 int 1586 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1587 { 1588 int error, ret, attrflag; 1589 struct nfsvattr nfsva; 1590 struct nfsmount *nmp; 1591 1592 nmp = VFSTONFS(vp->v_mount); 1593 error = EIO; 1594 attrflag = 0; 1595 if (NFSHASPNFS(nmp)) 1596 error = nfscl_doiods(vp, uiop, NULL, NULL, 1597 NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td); 1598 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error); 1599 if (error != 0) 1600 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, 1601 &attrflag); 1602 if (attrflag) { 1603 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 1604 if (ret && !error) 1605 error = ret; 1606 } 1607 if (error && NFS_ISV4(vp)) 1608 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1609 return (error); 1610 } 1611 1612 /* 1613 * nfs write call 1614 */ 1615 int 1616 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1617 int *iomode, int *must_commit, int called_from_strategy, int ioflag) 1618 { 1619 struct nfsvattr nfsva; 1620 int error, attrflag, ret; 1621 struct nfsmount *nmp; 1622 1623 nmp = VFSTONFS(vp->v_mount); 1624 error = EIO; 1625 attrflag = 0; 1626 if (NFSHASPNFS(nmp)) 1627 error = nfscl_doiods(vp, uiop, iomode, must_commit, 1628 NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td); 1629 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error); 1630 if (error != 0) 1631 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred, 1632 uiop->uio_td, &nfsva, &attrflag, called_from_strategy, 1633 ioflag); 1634 if (attrflag) { 1635 if (VTONFS(vp)->n_flag & ND_NFSV4) 1636 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 1, 1); 1637 else 1638 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 1639 if (ret && !error) 1640 error = ret; 1641 } 1642 if (DOINGASYNC(vp)) 1643 *iomode = NFSWRITE_FILESYNC; 1644 if (error && NFS_ISV4(vp)) 1645 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1646 return (error); 1647 } 1648 1649 /* 1650 * nfs mknod rpc 1651 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1652 * mode set to specify the file type and the size field for rdev. 1653 */ 1654 static int 1655 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1656 struct vattr *vap) 1657 { 1658 struct nfsvattr nfsva, dnfsva; 1659 struct vnode *newvp = NULL; 1660 struct nfsnode *np = NULL, *dnp; 1661 struct nfsfh *nfhp; 1662 struct vattr vattr; 1663 int error = 0, attrflag, dattrflag; 1664 u_int32_t rdev; 1665 1666 if (vap->va_type == VCHR || vap->va_type == VBLK) 1667 rdev = vap->va_rdev; 1668 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1669 rdev = 0xffffffff; 1670 else 1671 return (EOPNOTSUPP); 1672 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1673 return (error); 1674 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap, 1675 rdev, vap->va_type, cnp->cn_cred, curthread, &dnfsva, 1676 &nfsva, &nfhp, &attrflag, &dattrflag); 1677 if (!error) { 1678 if (!nfhp) 1679 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1680 cnp->cn_namelen, cnp->cn_cred, curthread, 1681 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 0); 1682 if (nfhp) 1683 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1684 curthread, &np, LK_EXCLUSIVE); 1685 } 1686 if (dattrflag) 1687 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 1688 if (!error) { 1689 newvp = NFSTOV(np); 1690 if (attrflag != 0) { 1691 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1692 if (error != 0) 1693 vput(newvp); 1694 } 1695 } 1696 if (!error) { 1697 *vpp = newvp; 1698 } else if (NFS_ISV4(dvp)) { 1699 error = nfscl_maperr(curthread, error, vap->va_uid, 1700 vap->va_gid); 1701 } 1702 dnp = VTONFS(dvp); 1703 NFSLOCKNODE(dnp); 1704 dnp->n_flag |= NMODIFIED; 1705 if (!dattrflag) { 1706 dnp->n_attrstamp = 0; 1707 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1708 } 1709 NFSUNLOCKNODE(dnp); 1710 return (error); 1711 } 1712 1713 /* 1714 * nfs mknod vop 1715 * just call nfs_mknodrpc() to do the work. 1716 */ 1717 /* ARGSUSED */ 1718 static int 1719 nfs_mknod(struct vop_mknod_args *ap) 1720 { 1721 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1722 } 1723 1724 static struct mtx nfs_cverf_mtx; 1725 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex", 1726 MTX_DEF); 1727 1728 static nfsquad_t 1729 nfs_get_cverf(void) 1730 { 1731 static nfsquad_t cverf; 1732 nfsquad_t ret; 1733 static int cverf_initialized = 0; 1734 1735 mtx_lock(&nfs_cverf_mtx); 1736 if (cverf_initialized == 0) { 1737 cverf.lval[0] = arc4random(); 1738 cverf.lval[1] = arc4random(); 1739 cverf_initialized = 1; 1740 } else 1741 cverf.qval++; 1742 ret = cverf; 1743 mtx_unlock(&nfs_cverf_mtx); 1744 1745 return (ret); 1746 } 1747 1748 /* 1749 * nfs file create call 1750 */ 1751 static int 1752 nfs_create(struct vop_create_args *ap) 1753 { 1754 struct vnode *dvp = ap->a_dvp; 1755 struct vattr *vap = ap->a_vap; 1756 struct componentname *cnp = ap->a_cnp; 1757 struct nfsnode *np = NULL, *dnp; 1758 struct vnode *newvp = NULL; 1759 struct nfsmount *nmp; 1760 struct nfsvattr dnfsva, nfsva; 1761 struct nfsfh *nfhp; 1762 nfsquad_t cverf; 1763 int error = 0, attrflag, dattrflag, fmode = 0; 1764 struct vattr vattr; 1765 1766 /* 1767 * Oops, not for me.. 1768 */ 1769 if (vap->va_type == VSOCK) 1770 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1771 1772 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1773 return (error); 1774 if (vap->va_vaflags & VA_EXCLUSIVE) 1775 fmode |= O_EXCL; 1776 dnp = VTONFS(dvp); 1777 nmp = VFSTONFS(dvp->v_mount); 1778 again: 1779 /* For NFSv4, wait until any remove is done. */ 1780 NFSLOCKNODE(dnp); 1781 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) { 1782 dnp->n_flag |= NREMOVEWANT; 1783 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0); 1784 } 1785 NFSUNLOCKNODE(dnp); 1786 1787 cverf = nfs_get_cverf(); 1788 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1789 vap, cverf, fmode, cnp->cn_cred, curthread, &dnfsva, &nfsva, 1790 &nfhp, &attrflag, &dattrflag); 1791 if (!error) { 1792 if (nfhp == NULL) 1793 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1794 cnp->cn_namelen, cnp->cn_cred, curthread, 1795 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 0); 1796 if (nfhp != NULL) 1797 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1798 curthread, &np, LK_EXCLUSIVE); 1799 } 1800 if (dattrflag) 1801 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 1802 if (!error) { 1803 newvp = NFSTOV(np); 1804 if (attrflag == 0) 1805 error = nfsrpc_getattr(newvp, cnp->cn_cred, curthread, 1806 &nfsva); 1807 if (error == 0) 1808 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 1809 } 1810 if (error) { 1811 if (newvp != NULL) { 1812 vput(newvp); 1813 newvp = NULL; 1814 } 1815 if (NFS_ISV34(dvp) && (fmode & O_EXCL) && 1816 error == NFSERR_NOTSUPP) { 1817 fmode &= ~O_EXCL; 1818 goto again; 1819 } 1820 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) { 1821 if (nfscl_checksattr(vap, &nfsva)) { 1822 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred, 1823 curthread, &nfsva, &attrflag); 1824 if (error && (vap->va_uid != (uid_t)VNOVAL || 1825 vap->va_gid != (gid_t)VNOVAL)) { 1826 /* try again without setting uid/gid */ 1827 vap->va_uid = (uid_t)VNOVAL; 1828 vap->va_gid = (uid_t)VNOVAL; 1829 error = nfsrpc_setattr(newvp, vap, NULL, 1830 cnp->cn_cred, curthread, &nfsva, &attrflag); 1831 } 1832 if (attrflag) 1833 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 1834 0, 1); 1835 if (error != 0) 1836 vput(newvp); 1837 } 1838 } 1839 if (!error) { 1840 if ((cnp->cn_flags & MAKEENTRY) && attrflag) { 1841 if (dvp != newvp) 1842 cache_enter_time(dvp, newvp, cnp, 1843 &nfsva.na_ctime, NULL); 1844 else 1845 printf("nfs_create: bogus NFS server returned " 1846 "the directory as the new file object\n"); 1847 } 1848 *ap->a_vpp = newvp; 1849 } else if (NFS_ISV4(dvp)) { 1850 error = nfscl_maperr(curthread, error, vap->va_uid, 1851 vap->va_gid); 1852 } 1853 NFSLOCKNODE(dnp); 1854 dnp->n_flag |= NMODIFIED; 1855 if (!dattrflag) { 1856 dnp->n_attrstamp = 0; 1857 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1858 } 1859 NFSUNLOCKNODE(dnp); 1860 return (error); 1861 } 1862 1863 /* 1864 * nfs file remove call 1865 * To try and make nfs semantics closer to ufs semantics, a file that has 1866 * other processes using the vnode is renamed instead of removed and then 1867 * removed later on the last close. 1868 * - If v_usecount > 1 1869 * If a rename is not already in the works 1870 * call nfs_sillyrename() to set it up 1871 * else 1872 * do the remove rpc 1873 */ 1874 static int 1875 nfs_remove(struct vop_remove_args *ap) 1876 { 1877 struct vnode *vp = ap->a_vp; 1878 struct vnode *dvp = ap->a_dvp; 1879 struct componentname *cnp = ap->a_cnp; 1880 struct nfsnode *np = VTONFS(vp); 1881 int error = 0; 1882 struct vattr vattr; 1883 1884 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name")); 1885 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount")); 1886 if (vp->v_type == VDIR) 1887 error = EPERM; 1888 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1889 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1890 vattr.va_nlink > 1)) { 1891 /* 1892 * Purge the name cache so that the chance of a lookup for 1893 * the name succeeding while the remove is in progress is 1894 * minimized. Without node locking it can still happen, such 1895 * that an I/O op returns ESTALE, but since you get this if 1896 * another host removes the file.. 1897 */ 1898 cache_purge(vp); 1899 /* 1900 * throw away biocache buffers, mainly to avoid 1901 * unnecessary delayed writes later. 1902 */ 1903 error = ncl_vinvalbuf(vp, 0, curthread, 1); 1904 if (error != EINTR && error != EIO) 1905 /* Do the rpc */ 1906 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr, 1907 cnp->cn_namelen, cnp->cn_cred, curthread); 1908 /* 1909 * Kludge City: If the first reply to the remove rpc is lost.. 1910 * the reply to the retransmitted request will be ENOENT 1911 * since the file was in fact removed 1912 * Therefore, we cheat and return success. 1913 */ 1914 if (error == ENOENT) 1915 error = 0; 1916 } else if (!np->n_sillyrename) 1917 error = nfs_sillyrename(dvp, vp, cnp); 1918 NFSLOCKNODE(np); 1919 np->n_attrstamp = 0; 1920 NFSUNLOCKNODE(np); 1921 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1922 return (error); 1923 } 1924 1925 /* 1926 * nfs file remove rpc called from nfs_inactive 1927 */ 1928 int 1929 ncl_removeit(struct sillyrename *sp, struct vnode *vp) 1930 { 1931 /* 1932 * Make sure that the directory vnode is still valid. 1933 * XXX we should lock sp->s_dvp here. 1934 */ 1935 if (sp->s_dvp->v_type == VBAD) 1936 return (0); 1937 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen, 1938 sp->s_cred, NULL)); 1939 } 1940 1941 /* 1942 * Nfs remove rpc, called from nfs_remove() and ncl_removeit(). 1943 */ 1944 static int 1945 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 1946 int namelen, struct ucred *cred, struct thread *td) 1947 { 1948 struct nfsvattr dnfsva; 1949 struct nfsnode *dnp = VTONFS(dvp); 1950 int error = 0, dattrflag; 1951 1952 NFSLOCKNODE(dnp); 1953 dnp->n_flag |= NREMOVEINPROG; 1954 NFSUNLOCKNODE(dnp); 1955 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva, 1956 &dattrflag); 1957 NFSLOCKNODE(dnp); 1958 if ((dnp->n_flag & NREMOVEWANT)) { 1959 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG); 1960 NFSUNLOCKNODE(dnp); 1961 wakeup((caddr_t)dnp); 1962 } else { 1963 dnp->n_flag &= ~NREMOVEINPROG; 1964 NFSUNLOCKNODE(dnp); 1965 } 1966 if (dattrflag) 1967 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 1968 NFSLOCKNODE(dnp); 1969 dnp->n_flag |= NMODIFIED; 1970 if (!dattrflag) { 1971 dnp->n_attrstamp = 0; 1972 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1973 } 1974 NFSUNLOCKNODE(dnp); 1975 if (error && NFS_ISV4(dvp)) 1976 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1977 return (error); 1978 } 1979 1980 /* 1981 * nfs file rename call 1982 */ 1983 static int 1984 nfs_rename(struct vop_rename_args *ap) 1985 { 1986 struct vnode *fvp = ap->a_fvp; 1987 struct vnode *tvp = ap->a_tvp; 1988 struct vnode *fdvp = ap->a_fdvp; 1989 struct vnode *tdvp = ap->a_tdvp; 1990 struct componentname *tcnp = ap->a_tcnp; 1991 struct componentname *fcnp = ap->a_fcnp; 1992 struct nfsnode *fnp = VTONFS(ap->a_fvp); 1993 struct nfsnode *tdnp = VTONFS(ap->a_tdvp); 1994 struct nfsv4node *newv4 = NULL; 1995 int error; 1996 1997 KASSERT((tcnp->cn_flags & HASBUF) != 0 && 1998 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name")); 1999 /* Check for cross-device rename */ 2000 if ((fvp->v_mount != tdvp->v_mount) || 2001 (tvp && (fvp->v_mount != tvp->v_mount))) { 2002 error = EXDEV; 2003 goto out; 2004 } 2005 2006 if (fvp == tvp) { 2007 printf("nfs_rename: fvp == tvp (can't happen)\n"); 2008 error = 0; 2009 goto out; 2010 } 2011 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0) 2012 goto out; 2013 2014 /* 2015 * We have to flush B_DELWRI data prior to renaming 2016 * the file. If we don't, the delayed-write buffers 2017 * can be flushed out later after the file has gone stale 2018 * under NFSV3. NFSV2 does not have this problem because 2019 * ( as far as I can tell ) it flushes dirty buffers more 2020 * often. 2021 * 2022 * Skip the rename operation if the fsync fails, this can happen 2023 * due to the server's volume being full, when we pushed out data 2024 * that was written back to our cache earlier. Not checking for 2025 * this condition can result in potential (silent) data loss. 2026 */ 2027 error = VOP_FSYNC(fvp, MNT_WAIT, curthread); 2028 NFSVOPUNLOCK(fvp); 2029 if (!error && tvp) 2030 error = VOP_FSYNC(tvp, MNT_WAIT, curthread); 2031 if (error) 2032 goto out; 2033 2034 /* 2035 * If the tvp exists and is in use, sillyrename it before doing the 2036 * rename of the new file over it. 2037 * XXX Can't sillyrename a directory. 2038 */ 2039 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 2040 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 2041 vput(tvp); 2042 tvp = NULL; 2043 } 2044 2045 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen, 2046 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 2047 curthread); 2048 2049 if (error == 0 && NFS_ISV4(tdvp)) { 2050 /* 2051 * For NFSv4, check to see if it is the same name and 2052 * replace the name, if it is different. 2053 */ 2054 newv4 = malloc( 2055 sizeof (struct nfsv4node) + 2056 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1, 2057 M_NFSV4NODE, M_WAITOK); 2058 NFSLOCKNODE(tdnp); 2059 NFSLOCKNODE(fnp); 2060 if (fnp->n_v4 != NULL && fvp->v_type == VREG && 2061 (fnp->n_v4->n4_namelen != tcnp->cn_namelen || 2062 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4), 2063 tcnp->cn_namelen) || 2064 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen || 2065 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 2066 tdnp->n_fhp->nfh_len))) { 2067 #ifdef notdef 2068 { char nnn[100]; int nnnl; 2069 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99; 2070 bcopy(tcnp->cn_nameptr, nnn, nnnl); 2071 nnn[nnnl] = '\0'; 2072 printf("ren replace=%s\n",nnn); 2073 } 2074 #endif 2075 free(fnp->n_v4, M_NFSV4NODE); 2076 fnp->n_v4 = newv4; 2077 newv4 = NULL; 2078 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len; 2079 fnp->n_v4->n4_namelen = tcnp->cn_namelen; 2080 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 2081 tdnp->n_fhp->nfh_len); 2082 NFSBCOPY(tcnp->cn_nameptr, 2083 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen); 2084 } 2085 NFSUNLOCKNODE(tdnp); 2086 NFSUNLOCKNODE(fnp); 2087 if (newv4 != NULL) 2088 free(newv4, M_NFSV4NODE); 2089 } 2090 2091 if (fvp->v_type == VDIR) { 2092 if (tvp != NULL && tvp->v_type == VDIR) 2093 cache_purge(tdvp); 2094 cache_purge(fdvp); 2095 } 2096 2097 out: 2098 if (tdvp == tvp) 2099 vrele(tdvp); 2100 else 2101 vput(tdvp); 2102 if (tvp) 2103 vput(tvp); 2104 vrele(fdvp); 2105 vrele(fvp); 2106 /* 2107 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 2108 */ 2109 if (error == ENOENT) 2110 error = 0; 2111 return (error); 2112 } 2113 2114 /* 2115 * nfs file rename rpc called from nfs_remove() above 2116 */ 2117 static int 2118 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp, 2119 struct sillyrename *sp) 2120 { 2121 2122 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen, 2123 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred, 2124 curthread)); 2125 } 2126 2127 /* 2128 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 2129 */ 2130 static int 2131 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr, 2132 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr, 2133 int tnamelen, struct ucred *cred, struct thread *td) 2134 { 2135 struct nfsvattr fnfsva, tnfsva; 2136 struct nfsnode *fdnp = VTONFS(fdvp); 2137 struct nfsnode *tdnp = VTONFS(tdvp); 2138 int error = 0, fattrflag, tattrflag; 2139 2140 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp, 2141 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag, 2142 &tattrflag); 2143 NFSLOCKNODE(fdnp); 2144 fdnp->n_flag |= NMODIFIED; 2145 if (fattrflag != 0) { 2146 NFSUNLOCKNODE(fdnp); 2147 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, 0, 1); 2148 } else { 2149 fdnp->n_attrstamp = 0; 2150 NFSUNLOCKNODE(fdnp); 2151 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 2152 } 2153 NFSLOCKNODE(tdnp); 2154 tdnp->n_flag |= NMODIFIED; 2155 if (tattrflag != 0) { 2156 NFSUNLOCKNODE(tdnp); 2157 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, 0, 1); 2158 } else { 2159 tdnp->n_attrstamp = 0; 2160 NFSUNLOCKNODE(tdnp); 2161 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2162 } 2163 if (error && NFS_ISV4(fdvp)) 2164 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2165 return (error); 2166 } 2167 2168 /* 2169 * nfs hard link create call 2170 */ 2171 static int 2172 nfs_link(struct vop_link_args *ap) 2173 { 2174 struct vnode *vp = ap->a_vp; 2175 struct vnode *tdvp = ap->a_tdvp; 2176 struct componentname *cnp = ap->a_cnp; 2177 struct nfsnode *np, *tdnp; 2178 struct nfsvattr nfsva, dnfsva; 2179 int error = 0, attrflag, dattrflag; 2180 2181 /* 2182 * Push all writes to the server, so that the attribute cache 2183 * doesn't get "out of sync" with the server. 2184 * XXX There should be a better way! 2185 */ 2186 VOP_FSYNC(vp, MNT_WAIT, curthread); 2187 2188 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 2189 cnp->cn_cred, curthread, &dnfsva, &nfsva, &attrflag, &dattrflag); 2190 tdnp = VTONFS(tdvp); 2191 NFSLOCKNODE(tdnp); 2192 tdnp->n_flag |= NMODIFIED; 2193 if (dattrflag != 0) { 2194 NFSUNLOCKNODE(tdnp); 2195 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, 0, 1); 2196 } else { 2197 tdnp->n_attrstamp = 0; 2198 NFSUNLOCKNODE(tdnp); 2199 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2200 } 2201 if (attrflag) 2202 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 2203 else { 2204 np = VTONFS(vp); 2205 NFSLOCKNODE(np); 2206 np->n_attrstamp = 0; 2207 NFSUNLOCKNODE(np); 2208 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 2209 } 2210 /* 2211 * If negative lookup caching is enabled, I might as well 2212 * add an entry for this node. Not necessary for correctness, 2213 * but if negative caching is enabled, then the system 2214 * must care about lookup caching hit rate, so... 2215 */ 2216 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 && 2217 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2218 if (tdvp != vp) 2219 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL); 2220 else 2221 printf("nfs_link: bogus NFS server returned " 2222 "the directory as the new link\n"); 2223 } 2224 if (error && NFS_ISV4(vp)) 2225 error = nfscl_maperr(curthread, error, (uid_t)0, 2226 (gid_t)0); 2227 return (error); 2228 } 2229 2230 /* 2231 * nfs symbolic link create call 2232 */ 2233 static int 2234 nfs_symlink(struct vop_symlink_args *ap) 2235 { 2236 struct vnode *dvp = ap->a_dvp; 2237 struct vattr *vap = ap->a_vap; 2238 struct componentname *cnp = ap->a_cnp; 2239 struct nfsvattr nfsva, dnfsva; 2240 struct nfsfh *nfhp; 2241 struct nfsnode *np = NULL, *dnp; 2242 struct vnode *newvp = NULL; 2243 int error = 0, attrflag, dattrflag, ret; 2244 2245 vap->va_type = VLNK; 2246 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2247 ap->a_target, vap, cnp->cn_cred, curthread, &dnfsva, 2248 &nfsva, &nfhp, &attrflag, &dattrflag); 2249 if (nfhp) { 2250 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread, 2251 &np, LK_EXCLUSIVE); 2252 if (!ret) 2253 newvp = NFSTOV(np); 2254 else if (!error) 2255 error = ret; 2256 } 2257 if (newvp != NULL) { 2258 if (attrflag) 2259 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 2260 } else if (!error) { 2261 /* 2262 * If we do not have an error and we could not extract the 2263 * newvp from the response due to the request being NFSv2, we 2264 * have to do a lookup in order to obtain a newvp to return. 2265 */ 2266 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2267 cnp->cn_cred, curthread, &np); 2268 if (!error) 2269 newvp = NFSTOV(np); 2270 } 2271 if (error) { 2272 if (newvp) 2273 vput(newvp); 2274 if (NFS_ISV4(dvp)) 2275 error = nfscl_maperr(curthread, error, 2276 vap->va_uid, vap->va_gid); 2277 } else { 2278 *ap->a_vpp = newvp; 2279 } 2280 2281 dnp = VTONFS(dvp); 2282 NFSLOCKNODE(dnp); 2283 dnp->n_flag |= NMODIFIED; 2284 if (dattrflag != 0) { 2285 NFSUNLOCKNODE(dnp); 2286 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 2287 } else { 2288 dnp->n_attrstamp = 0; 2289 NFSUNLOCKNODE(dnp); 2290 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2291 } 2292 /* 2293 * If negative lookup caching is enabled, I might as well 2294 * add an entry for this node. Not necessary for correctness, 2295 * but if negative caching is enabled, then the system 2296 * must care about lookup caching hit rate, so... 2297 */ 2298 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2299 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2300 if (dvp != newvp) 2301 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 2302 NULL); 2303 else 2304 printf("nfs_symlink: bogus NFS server returned " 2305 "the directory as the new file object\n"); 2306 } 2307 return (error); 2308 } 2309 2310 /* 2311 * nfs make dir call 2312 */ 2313 static int 2314 nfs_mkdir(struct vop_mkdir_args *ap) 2315 { 2316 struct vnode *dvp = ap->a_dvp; 2317 struct vattr *vap = ap->a_vap; 2318 struct componentname *cnp = ap->a_cnp; 2319 struct nfsnode *np = NULL, *dnp; 2320 struct vnode *newvp = NULL; 2321 struct vattr vattr; 2322 struct nfsfh *nfhp; 2323 struct nfsvattr nfsva, dnfsva; 2324 int error = 0, attrflag, dattrflag, ret; 2325 2326 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2327 return (error); 2328 vap->va_type = VDIR; 2329 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2330 vap, cnp->cn_cred, curthread, &dnfsva, &nfsva, &nfhp, 2331 &attrflag, &dattrflag); 2332 dnp = VTONFS(dvp); 2333 NFSLOCKNODE(dnp); 2334 dnp->n_flag |= NMODIFIED; 2335 if (dattrflag != 0) { 2336 NFSUNLOCKNODE(dnp); 2337 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 2338 } else { 2339 dnp->n_attrstamp = 0; 2340 NFSUNLOCKNODE(dnp); 2341 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2342 } 2343 if (nfhp) { 2344 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread, 2345 &np, LK_EXCLUSIVE); 2346 if (!ret) { 2347 newvp = NFSTOV(np); 2348 if (attrflag) 2349 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 2350 0, 1); 2351 } else if (!error) 2352 error = ret; 2353 } 2354 if (!error && newvp == NULL) { 2355 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2356 cnp->cn_cred, curthread, &np); 2357 if (!error) { 2358 newvp = NFSTOV(np); 2359 if (newvp->v_type != VDIR) 2360 error = EEXIST; 2361 } 2362 } 2363 if (error) { 2364 if (newvp) 2365 vput(newvp); 2366 if (NFS_ISV4(dvp)) 2367 error = nfscl_maperr(curthread, error, 2368 vap->va_uid, vap->va_gid); 2369 } else { 2370 /* 2371 * If negative lookup caching is enabled, I might as well 2372 * add an entry for this node. Not necessary for correctness, 2373 * but if negative caching is enabled, then the system 2374 * must care about lookup caching hit rate, so... 2375 */ 2376 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2377 (cnp->cn_flags & MAKEENTRY) && 2378 attrflag != 0 && dattrflag != 0) { 2379 if (dvp != newvp) 2380 cache_enter_time(dvp, newvp, cnp, 2381 &nfsva.na_ctime, &dnfsva.na_ctime); 2382 else 2383 printf("nfs_mkdir: bogus NFS server returned " 2384 "the directory that the directory was " 2385 "created in as the new file object\n"); 2386 } 2387 *ap->a_vpp = newvp; 2388 } 2389 return (error); 2390 } 2391 2392 /* 2393 * nfs remove directory call 2394 */ 2395 static int 2396 nfs_rmdir(struct vop_rmdir_args *ap) 2397 { 2398 struct vnode *vp = ap->a_vp; 2399 struct vnode *dvp = ap->a_dvp; 2400 struct componentname *cnp = ap->a_cnp; 2401 struct nfsnode *dnp; 2402 struct nfsvattr dnfsva; 2403 int error, dattrflag; 2404 2405 if (dvp == vp) 2406 return (EINVAL); 2407 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2408 cnp->cn_cred, curthread, &dnfsva, &dattrflag); 2409 dnp = VTONFS(dvp); 2410 NFSLOCKNODE(dnp); 2411 dnp->n_flag |= NMODIFIED; 2412 if (dattrflag != 0) { 2413 NFSUNLOCKNODE(dnp); 2414 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 2415 } else { 2416 dnp->n_attrstamp = 0; 2417 NFSUNLOCKNODE(dnp); 2418 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2419 } 2420 2421 cache_purge(dvp); 2422 cache_purge(vp); 2423 if (error && NFS_ISV4(dvp)) 2424 error = nfscl_maperr(curthread, error, (uid_t)0, 2425 (gid_t)0); 2426 /* 2427 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2428 */ 2429 if (error == ENOENT) 2430 error = 0; 2431 return (error); 2432 } 2433 2434 /* 2435 * nfs readdir call 2436 */ 2437 static int 2438 nfs_readdir(struct vop_readdir_args *ap) 2439 { 2440 struct vnode *vp = ap->a_vp; 2441 struct nfsnode *np = VTONFS(vp); 2442 struct uio *uio = ap->a_uio; 2443 ssize_t tresid, left; 2444 int error = 0; 2445 struct vattr vattr; 2446 2447 if (ap->a_eofflag != NULL) 2448 *ap->a_eofflag = 0; 2449 if (vp->v_type != VDIR) 2450 return(EPERM); 2451 2452 /* 2453 * First, check for hit on the EOF offset cache 2454 */ 2455 NFSLOCKNODE(np); 2456 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2457 (np->n_flag & NMODIFIED) == 0) { 2458 NFSUNLOCKNODE(np); 2459 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2460 NFSLOCKNODE(np); 2461 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) || 2462 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2463 NFSUNLOCKNODE(np); 2464 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits); 2465 if (ap->a_eofflag != NULL) 2466 *ap->a_eofflag = 1; 2467 return (0); 2468 } else 2469 NFSUNLOCKNODE(np); 2470 } 2471 } else 2472 NFSUNLOCKNODE(np); 2473 2474 /* 2475 * NFS always guarantees that directory entries don't straddle 2476 * DIRBLKSIZ boundaries. As such, we need to limit the size 2477 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial 2478 * directory entry. 2479 */ 2480 left = uio->uio_resid % DIRBLKSIZ; 2481 if (left == uio->uio_resid) 2482 return (EINVAL); 2483 uio->uio_resid -= left; 2484 2485 /* 2486 * Call ncl_bioread() to do the real work. 2487 */ 2488 tresid = uio->uio_resid; 2489 error = ncl_bioread(vp, uio, 0, ap->a_cred); 2490 2491 if (!error && uio->uio_resid == tresid) { 2492 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses); 2493 if (ap->a_eofflag != NULL) 2494 *ap->a_eofflag = 1; 2495 } 2496 2497 /* Add the partial DIRBLKSIZ (left) back in. */ 2498 uio->uio_resid += left; 2499 return (error); 2500 } 2501 2502 /* 2503 * Readdir rpc call. 2504 * Called from below the buffer cache by ncl_doio(). 2505 */ 2506 int 2507 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2508 struct thread *td) 2509 { 2510 struct nfsvattr nfsva; 2511 nfsuint64 *cookiep, cookie; 2512 struct nfsnode *dnp = VTONFS(vp); 2513 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2514 int error = 0, eof, attrflag; 2515 2516 KASSERT(uiop->uio_iovcnt == 1 && 2517 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2518 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2519 ("nfs readdirrpc bad uio")); 2520 2521 /* 2522 * If there is no cookie, assume directory was stale. 2523 */ 2524 ncl_dircookie_lock(dnp); 2525 NFSUNLOCKNODE(dnp); 2526 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2527 if (cookiep) { 2528 cookie = *cookiep; 2529 ncl_dircookie_unlock(dnp); 2530 } else { 2531 ncl_dircookie_unlock(dnp); 2532 return (NFSERR_BAD_COOKIE); 2533 } 2534 2535 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2536 (void)ncl_fsinfo(nmp, vp, cred, td); 2537 2538 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva, 2539 &attrflag, &eof); 2540 if (attrflag) 2541 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 2542 2543 if (!error) { 2544 /* 2545 * We are now either at the end of the directory or have filled 2546 * the block. 2547 */ 2548 if (eof) { 2549 NFSLOCKNODE(dnp); 2550 dnp->n_direofoffset = uiop->uio_offset; 2551 NFSUNLOCKNODE(dnp); 2552 } else { 2553 if (uiop->uio_resid > 0) 2554 printf("EEK! readdirrpc resid > 0\n"); 2555 ncl_dircookie_lock(dnp); 2556 NFSUNLOCKNODE(dnp); 2557 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2558 *cookiep = cookie; 2559 ncl_dircookie_unlock(dnp); 2560 } 2561 } else if (NFS_ISV4(vp)) { 2562 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2563 } 2564 return (error); 2565 } 2566 2567 /* 2568 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc(). 2569 */ 2570 int 2571 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2572 struct thread *td) 2573 { 2574 struct nfsvattr nfsva; 2575 nfsuint64 *cookiep, cookie; 2576 struct nfsnode *dnp = VTONFS(vp); 2577 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2578 int error = 0, attrflag, eof; 2579 2580 KASSERT(uiop->uio_iovcnt == 1 && 2581 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2582 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2583 ("nfs readdirplusrpc bad uio")); 2584 2585 /* 2586 * If there is no cookie, assume directory was stale. 2587 */ 2588 ncl_dircookie_lock(dnp); 2589 NFSUNLOCKNODE(dnp); 2590 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2591 if (cookiep) { 2592 cookie = *cookiep; 2593 ncl_dircookie_unlock(dnp); 2594 } else { 2595 ncl_dircookie_unlock(dnp); 2596 return (NFSERR_BAD_COOKIE); 2597 } 2598 2599 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2600 (void)ncl_fsinfo(nmp, vp, cred, td); 2601 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva, 2602 &attrflag, &eof); 2603 if (attrflag) 2604 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 2605 2606 if (!error) { 2607 /* 2608 * We are now either at end of the directory or have filled the 2609 * the block. 2610 */ 2611 if (eof) { 2612 NFSLOCKNODE(dnp); 2613 dnp->n_direofoffset = uiop->uio_offset; 2614 NFSUNLOCKNODE(dnp); 2615 } else { 2616 if (uiop->uio_resid > 0) 2617 printf("EEK! readdirplusrpc resid > 0\n"); 2618 ncl_dircookie_lock(dnp); 2619 NFSUNLOCKNODE(dnp); 2620 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2621 *cookiep = cookie; 2622 ncl_dircookie_unlock(dnp); 2623 } 2624 } else if (NFS_ISV4(vp)) { 2625 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2626 } 2627 return (error); 2628 } 2629 2630 /* 2631 * Silly rename. To make the NFS filesystem that is stateless look a little 2632 * more like the "ufs" a remove of an active vnode is translated to a rename 2633 * to a funny looking filename that is removed by nfs_inactive on the 2634 * nfsnode. There is the potential for another process on a different client 2635 * to create the same funny name between the nfs_lookitup() fails and the 2636 * nfs_rename() completes, but... 2637 */ 2638 static int 2639 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2640 { 2641 struct sillyrename *sp; 2642 struct nfsnode *np; 2643 int error; 2644 short pid; 2645 unsigned int lticks; 2646 2647 cache_purge(dvp); 2648 np = VTONFS(vp); 2649 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir")); 2650 sp = malloc(sizeof (struct sillyrename), 2651 M_NEWNFSREQ, M_WAITOK); 2652 sp->s_cred = crhold(cnp->cn_cred); 2653 sp->s_dvp = dvp; 2654 VREF(dvp); 2655 2656 /* 2657 * Fudge together a funny name. 2658 * Changing the format of the funny name to accommodate more 2659 * sillynames per directory. 2660 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2661 * CPU ticks since boot. 2662 */ 2663 pid = curthread->td_proc->p_pid; 2664 lticks = (unsigned int)ticks; 2665 for ( ; ; ) { 2666 sp->s_namlen = sprintf(sp->s_name, 2667 ".nfs.%08x.%04x4.4", lticks, 2668 pid); 2669 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2670 curthread, NULL)) 2671 break; 2672 lticks++; 2673 } 2674 error = nfs_renameit(dvp, vp, cnp, sp); 2675 if (error) 2676 goto bad; 2677 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2678 curthread, &np); 2679 np->n_sillyrename = sp; 2680 return (0); 2681 bad: 2682 vrele(sp->s_dvp); 2683 crfree(sp->s_cred); 2684 free(sp, M_NEWNFSREQ); 2685 return (error); 2686 } 2687 2688 /* 2689 * Look up a file name and optionally either update the file handle or 2690 * allocate an nfsnode, depending on the value of npp. 2691 * npp == NULL --> just do the lookup 2692 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2693 * handled too 2694 * *npp != NULL --> update the file handle in the vnode 2695 */ 2696 static int 2697 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred, 2698 struct thread *td, struct nfsnode **npp) 2699 { 2700 struct vnode *newvp = NULL, *vp; 2701 struct nfsnode *np, *dnp = VTONFS(dvp); 2702 struct nfsfh *nfhp, *onfhp; 2703 struct nfsvattr nfsva, dnfsva; 2704 struct componentname cn; 2705 int error = 0, attrflag, dattrflag; 2706 u_int hash; 2707 struct timespec ts; 2708 2709 nanouptime(&ts); 2710 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva, 2711 &nfhp, &attrflag, &dattrflag, 0); 2712 if (dattrflag) 2713 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1); 2714 if (npp && !error) { 2715 if (*npp != NULL) { 2716 np = *npp; 2717 vp = NFSTOV(np); 2718 /* 2719 * For NFSv4, check to see if it is the same name and 2720 * replace the name, if it is different. 2721 */ 2722 if (np->n_v4 != NULL && nfsva.na_type == VREG && 2723 (np->n_v4->n4_namelen != len || 2724 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) || 2725 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen || 2726 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2727 dnp->n_fhp->nfh_len))) { 2728 #ifdef notdef 2729 { char nnn[100]; int nnnl; 2730 nnnl = (len < 100) ? len : 99; 2731 bcopy(name, nnn, nnnl); 2732 nnn[nnnl] = '\0'; 2733 printf("replace=%s\n",nnn); 2734 } 2735 #endif 2736 free(np->n_v4, M_NFSV4NODE); 2737 np->n_v4 = malloc( 2738 sizeof (struct nfsv4node) + 2739 dnp->n_fhp->nfh_len + len - 1, 2740 M_NFSV4NODE, M_WAITOK); 2741 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len; 2742 np->n_v4->n4_namelen = len; 2743 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2744 dnp->n_fhp->nfh_len); 2745 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len); 2746 } 2747 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, 2748 FNV1_32_INIT); 2749 onfhp = np->n_fhp; 2750 /* 2751 * Rehash node for new file handle. 2752 */ 2753 vfs_hash_rehash(vp, hash); 2754 np->n_fhp = nfhp; 2755 if (onfhp != NULL) 2756 free(onfhp, M_NFSFH); 2757 newvp = NFSTOV(np); 2758 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) { 2759 free(nfhp, M_NFSFH); 2760 VREF(dvp); 2761 newvp = dvp; 2762 } else { 2763 cn.cn_nameptr = name; 2764 cn.cn_namelen = len; 2765 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td, 2766 &np, LK_EXCLUSIVE); 2767 if (error) 2768 return (error); 2769 newvp = NFSTOV(np); 2770 /* 2771 * If n_localmodtime >= time before RPC, then 2772 * a file modification operation, such as 2773 * VOP_SETATTR() of size, has occurred while 2774 * the Lookup RPC and acquisition of the vnode 2775 * happened. As such, the attributes might 2776 * be stale, with possibly an incorrect size. 2777 */ 2778 NFSLOCKNODE(np); 2779 if (timespecisset(&np->n_localmodtime) && 2780 timespeccmp(&np->n_localmodtime, &ts, >=)) { 2781 NFSCL_DEBUG(4, "nfs_lookitup: localmod " 2782 "stale attributes\n"); 2783 attrflag = 0; 2784 } 2785 NFSUNLOCKNODE(np); 2786 } 2787 if (!attrflag && *npp == NULL) { 2788 if (newvp == dvp) 2789 vrele(newvp); 2790 else 2791 vput(newvp); 2792 return (ENOENT); 2793 } 2794 if (attrflag) 2795 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1); 2796 } 2797 if (npp && *npp == NULL) { 2798 if (error) { 2799 if (newvp) { 2800 if (newvp == dvp) 2801 vrele(newvp); 2802 else 2803 vput(newvp); 2804 } 2805 } else 2806 *npp = np; 2807 } 2808 if (error && NFS_ISV4(dvp)) 2809 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2810 return (error); 2811 } 2812 2813 /* 2814 * Nfs Version 3 and 4 commit rpc 2815 */ 2816 int 2817 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2818 struct thread *td) 2819 { 2820 struct nfsvattr nfsva; 2821 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2822 struct nfsnode *np; 2823 struct uio uio; 2824 int error, attrflag; 2825 2826 np = VTONFS(vp); 2827 error = EIO; 2828 attrflag = 0; 2829 if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) { 2830 uio.uio_offset = offset; 2831 uio.uio_resid = cnt; 2832 error = nfscl_doiods(vp, &uio, NULL, NULL, 2833 NFSV4OPEN_ACCESSWRITE, 1, cred, td); 2834 if (error != 0) { 2835 NFSLOCKNODE(np); 2836 np->n_flag &= ~NDSCOMMIT; 2837 NFSUNLOCKNODE(np); 2838 } 2839 } 2840 if (error != 0) { 2841 mtx_lock(&nmp->nm_mtx); 2842 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2843 mtx_unlock(&nmp->nm_mtx); 2844 return (0); 2845 } 2846 mtx_unlock(&nmp->nm_mtx); 2847 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva, 2848 &attrflag); 2849 } 2850 if (attrflag != 0) 2851 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 2852 if (error != 0 && NFS_ISV4(vp)) 2853 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2854 return (error); 2855 } 2856 2857 /* 2858 * Strategy routine. 2859 * For async requests when nfsiod(s) are running, queue the request by 2860 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the 2861 * request. 2862 */ 2863 static int 2864 nfs_strategy(struct vop_strategy_args *ap) 2865 { 2866 struct buf *bp; 2867 struct vnode *vp; 2868 struct ucred *cr; 2869 2870 bp = ap->a_bp; 2871 vp = ap->a_vp; 2872 KASSERT(bp->b_vp == vp, ("missing b_getvp")); 2873 KASSERT(!(bp->b_flags & B_DONE), 2874 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2875 2876 if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno) 2877 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize / 2878 DEV_BSIZE); 2879 if (bp->b_iocmd == BIO_READ) 2880 cr = bp->b_rcred; 2881 else 2882 cr = bp->b_wcred; 2883 2884 /* 2885 * If the op is asynchronous and an i/o daemon is waiting 2886 * queue the request, wake it up and wait for completion 2887 * otherwise just do it ourselves. 2888 */ 2889 if ((bp->b_flags & B_ASYNC) == 0 || 2890 ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread)) 2891 (void) ncl_doio(vp, bp, cr, curthread, 1); 2892 return (0); 2893 } 2894 2895 /* 2896 * fsync vnode op. Just call ncl_flush() with commit == 1. 2897 */ 2898 /* ARGSUSED */ 2899 static int 2900 nfs_fsync(struct vop_fsync_args *ap) 2901 { 2902 2903 if (ap->a_vp->v_type != VREG) { 2904 /* 2905 * For NFS, metadata is changed synchronously on the server, 2906 * so there is nothing to flush. Also, ncl_flush() clears 2907 * the NMODIFIED flag and that shouldn't be done here for 2908 * directories. 2909 */ 2910 return (0); 2911 } 2912 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0)); 2913 } 2914 2915 /* 2916 * Flush all the blocks associated with a vnode. 2917 * Walk through the buffer pool and push any dirty pages 2918 * associated with the vnode. 2919 * If the called_from_renewthread argument is TRUE, it has been called 2920 * from the NFSv4 renew thread and, as such, cannot block indefinitely 2921 * waiting for a buffer write to complete. 2922 */ 2923 int 2924 ncl_flush(struct vnode *vp, int waitfor, struct thread *td, 2925 int commit, int called_from_renewthread) 2926 { 2927 struct nfsnode *np = VTONFS(vp); 2928 struct buf *bp; 2929 int i; 2930 struct buf *nbp; 2931 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2932 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2933 int passone = 1, trycnt = 0; 2934 u_quad_t off, endoff, toff; 2935 struct ucred* wcred = NULL; 2936 struct buf **bvec = NULL; 2937 struct bufobj *bo; 2938 #ifndef NFS_COMMITBVECSIZ 2939 #define NFS_COMMITBVECSIZ 20 2940 #endif 2941 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2942 u_int bvecsize = 0, bveccount; 2943 struct timespec ts; 2944 2945 if (called_from_renewthread != 0) 2946 slptimeo = hz; 2947 if (nmp->nm_flag & NFSMNT_INT) 2948 slpflag = PCATCH; 2949 if (!commit) 2950 passone = 0; 2951 bo = &vp->v_bufobj; 2952 /* 2953 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2954 * server, but has not been committed to stable storage on the server 2955 * yet. On the first pass, the byte range is worked out and the commit 2956 * rpc is done. On the second pass, ncl_writebp() is called to do the 2957 * job. 2958 */ 2959 again: 2960 off = (u_quad_t)-1; 2961 endoff = 0; 2962 bvecpos = 0; 2963 if (NFS_ISV34(vp) && commit) { 2964 if (bvec != NULL && bvec != bvec_on_stack) 2965 free(bvec, M_TEMP); 2966 /* 2967 * Count up how many buffers waiting for a commit. 2968 */ 2969 bveccount = 0; 2970 BO_LOCK(bo); 2971 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2972 if (!BUF_ISLOCKED(bp) && 2973 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2974 == (B_DELWRI | B_NEEDCOMMIT)) 2975 bveccount++; 2976 } 2977 /* 2978 * Allocate space to remember the list of bufs to commit. It is 2979 * important to use M_NOWAIT here to avoid a race with nfs_write. 2980 * If we can't get memory (for whatever reason), we will end up 2981 * committing the buffers one-by-one in the loop below. 2982 */ 2983 if (bveccount > NFS_COMMITBVECSIZ) { 2984 /* 2985 * Release the vnode interlock to avoid a lock 2986 * order reversal. 2987 */ 2988 BO_UNLOCK(bo); 2989 bvec = (struct buf **) 2990 malloc(bveccount * sizeof(struct buf *), 2991 M_TEMP, M_NOWAIT); 2992 BO_LOCK(bo); 2993 if (bvec == NULL) { 2994 bvec = bvec_on_stack; 2995 bvecsize = NFS_COMMITBVECSIZ; 2996 } else 2997 bvecsize = bveccount; 2998 } else { 2999 bvec = bvec_on_stack; 3000 bvecsize = NFS_COMMITBVECSIZ; 3001 } 3002 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3003 if (bvecpos >= bvecsize) 3004 break; 3005 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3006 nbp = TAILQ_NEXT(bp, b_bobufs); 3007 continue; 3008 } 3009 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3010 (B_DELWRI | B_NEEDCOMMIT)) { 3011 BUF_UNLOCK(bp); 3012 nbp = TAILQ_NEXT(bp, b_bobufs); 3013 continue; 3014 } 3015 BO_UNLOCK(bo); 3016 bremfree(bp); 3017 /* 3018 * Work out if all buffers are using the same cred 3019 * so we can deal with them all with one commit. 3020 * 3021 * NOTE: we are not clearing B_DONE here, so we have 3022 * to do it later on in this routine if we intend to 3023 * initiate I/O on the bp. 3024 * 3025 * Note: to avoid loopback deadlocks, we do not 3026 * assign b_runningbufspace. 3027 */ 3028 if (wcred == NULL) 3029 wcred = bp->b_wcred; 3030 else if (wcred != bp->b_wcred) 3031 wcred = NOCRED; 3032 vfs_busy_pages(bp, 1); 3033 3034 BO_LOCK(bo); 3035 /* 3036 * bp is protected by being locked, but nbp is not 3037 * and vfs_busy_pages() may sleep. We have to 3038 * recalculate nbp. 3039 */ 3040 nbp = TAILQ_NEXT(bp, b_bobufs); 3041 3042 /* 3043 * A list of these buffers is kept so that the 3044 * second loop knows which buffers have actually 3045 * been committed. This is necessary, since there 3046 * may be a race between the commit rpc and new 3047 * uncommitted writes on the file. 3048 */ 3049 bvec[bvecpos++] = bp; 3050 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3051 bp->b_dirtyoff; 3052 if (toff < off) 3053 off = toff; 3054 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 3055 if (toff > endoff) 3056 endoff = toff; 3057 } 3058 BO_UNLOCK(bo); 3059 } 3060 if (bvecpos > 0) { 3061 /* 3062 * Commit data on the server, as required. 3063 * If all bufs are using the same wcred, then use that with 3064 * one call for all of them, otherwise commit each one 3065 * separately. 3066 */ 3067 if (wcred != NOCRED) 3068 retv = ncl_commit(vp, off, (int)(endoff - off), 3069 wcred, td); 3070 else { 3071 retv = 0; 3072 for (i = 0; i < bvecpos; i++) { 3073 off_t off, size; 3074 bp = bvec[i]; 3075 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3076 bp->b_dirtyoff; 3077 size = (u_quad_t)(bp->b_dirtyend 3078 - bp->b_dirtyoff); 3079 retv = ncl_commit(vp, off, (int)size, 3080 bp->b_wcred, td); 3081 if (retv) break; 3082 } 3083 } 3084 3085 if (retv == NFSERR_STALEWRITEVERF) 3086 ncl_clearcommit(vp->v_mount); 3087 3088 /* 3089 * Now, either mark the blocks I/O done or mark the 3090 * blocks dirty, depending on whether the commit 3091 * succeeded. 3092 */ 3093 for (i = 0; i < bvecpos; i++) { 3094 bp = bvec[i]; 3095 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3096 if (!NFSCL_FORCEDISM(vp->v_mount) && retv) { 3097 /* 3098 * Error, leave B_DELWRI intact 3099 */ 3100 vfs_unbusy_pages(bp); 3101 brelse(bp); 3102 } else { 3103 /* 3104 * Success, remove B_DELWRI ( bundirty() ). 3105 * 3106 * b_dirtyoff/b_dirtyend seem to be NFS 3107 * specific. We should probably move that 3108 * into bundirty(). XXX 3109 */ 3110 bufobj_wref(bo); 3111 bp->b_flags |= B_ASYNC; 3112 bundirty(bp); 3113 bp->b_flags &= ~B_DONE; 3114 bp->b_ioflags &= ~BIO_ERROR; 3115 bp->b_dirtyoff = bp->b_dirtyend = 0; 3116 bufdone(bp); 3117 } 3118 } 3119 } 3120 3121 /* 3122 * Start/do any write(s) that are required. 3123 */ 3124 loop: 3125 BO_LOCK(bo); 3126 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3127 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3128 if (waitfor != MNT_WAIT || passone) 3129 continue; 3130 3131 error = BUF_TIMELOCK(bp, 3132 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 3133 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo); 3134 if (error == 0) { 3135 BUF_UNLOCK(bp); 3136 goto loop; 3137 } 3138 if (error == ENOLCK) { 3139 error = 0; 3140 goto loop; 3141 } 3142 if (called_from_renewthread != 0) { 3143 /* 3144 * Return EIO so the flush will be retried 3145 * later. 3146 */ 3147 error = EIO; 3148 goto done; 3149 } 3150 if (newnfs_sigintr(nmp, td)) { 3151 error = EINTR; 3152 goto done; 3153 } 3154 if (slpflag == PCATCH) { 3155 slpflag = 0; 3156 slptimeo = 2 * hz; 3157 } 3158 goto loop; 3159 } 3160 if ((bp->b_flags & B_DELWRI) == 0) 3161 panic("nfs_fsync: not dirty"); 3162 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3163 BUF_UNLOCK(bp); 3164 continue; 3165 } 3166 BO_UNLOCK(bo); 3167 bremfree(bp); 3168 bp->b_flags |= B_ASYNC; 3169 bwrite(bp); 3170 if (newnfs_sigintr(nmp, td)) { 3171 error = EINTR; 3172 goto done; 3173 } 3174 goto loop; 3175 } 3176 if (passone) { 3177 passone = 0; 3178 BO_UNLOCK(bo); 3179 goto again; 3180 } 3181 if (waitfor == MNT_WAIT) { 3182 while (bo->bo_numoutput) { 3183 error = bufobj_wwait(bo, slpflag, slptimeo); 3184 if (error) { 3185 BO_UNLOCK(bo); 3186 if (called_from_renewthread != 0) { 3187 /* 3188 * Return EIO so that the flush will be 3189 * retried later. 3190 */ 3191 error = EIO; 3192 goto done; 3193 } 3194 error = newnfs_sigintr(nmp, td); 3195 if (error) 3196 goto done; 3197 if (slpflag == PCATCH) { 3198 slpflag = 0; 3199 slptimeo = 2 * hz; 3200 } 3201 BO_LOCK(bo); 3202 } 3203 } 3204 if (bo->bo_dirty.bv_cnt != 0 && commit) { 3205 BO_UNLOCK(bo); 3206 goto loop; 3207 } 3208 /* 3209 * Wait for all the async IO requests to drain 3210 */ 3211 BO_UNLOCK(bo); 3212 NFSLOCKNODE(np); 3213 while (np->n_directio_asyncwr > 0) { 3214 np->n_flag |= NFSYNCWAIT; 3215 error = newnfs_msleep(td, &np->n_directio_asyncwr, 3216 &np->n_mtx, slpflag | (PRIBIO + 1), 3217 "nfsfsync", 0); 3218 if (error) { 3219 if (newnfs_sigintr(nmp, td)) { 3220 NFSUNLOCKNODE(np); 3221 error = EINTR; 3222 goto done; 3223 } 3224 } 3225 } 3226 NFSUNLOCKNODE(np); 3227 } else 3228 BO_UNLOCK(bo); 3229 if (NFSHASPNFS(nmp)) { 3230 nfscl_layoutcommit(vp, td); 3231 /* 3232 * Invalidate the attribute cache, since writes to a DS 3233 * won't update the size attribute. 3234 */ 3235 NFSLOCKNODE(np); 3236 np->n_attrstamp = 0; 3237 } else 3238 NFSLOCKNODE(np); 3239 if (np->n_flag & NWRITEERR) { 3240 error = np->n_error; 3241 np->n_flag &= ~NWRITEERR; 3242 } 3243 if (commit && bo->bo_dirty.bv_cnt == 0 && 3244 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) 3245 np->n_flag &= ~NMODIFIED; 3246 NFSUNLOCKNODE(np); 3247 done: 3248 if (bvec != NULL && bvec != bvec_on_stack) 3249 free(bvec, M_TEMP); 3250 if (error == 0 && commit != 0 && waitfor == MNT_WAIT && 3251 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 || 3252 np->n_directio_asyncwr != 0)) { 3253 if (trycnt++ < 5) { 3254 /* try, try again... */ 3255 passone = 1; 3256 wcred = NULL; 3257 bvec = NULL; 3258 bvecsize = 0; 3259 goto again; 3260 } 3261 vn_printf(vp, "ncl_flush failed"); 3262 error = called_from_renewthread != 0 ? EIO : EBUSY; 3263 } 3264 if (error == 0) { 3265 nanouptime(&ts); 3266 NFSLOCKNODE(np); 3267 np->n_localmodtime = ts; 3268 NFSUNLOCKNODE(np); 3269 } 3270 return (error); 3271 } 3272 3273 /* 3274 * NFS advisory byte-level locks. 3275 */ 3276 static int 3277 nfs_advlock(struct vop_advlock_args *ap) 3278 { 3279 struct vnode *vp = ap->a_vp; 3280 struct ucred *cred; 3281 struct nfsnode *np = VTONFS(ap->a_vp); 3282 struct proc *p = (struct proc *)ap->a_id; 3283 struct thread *td = curthread; /* XXX */ 3284 struct vattr va; 3285 int ret, error; 3286 u_quad_t size; 3287 struct nfsmount *nmp; 3288 3289 error = NFSVOPLOCK(vp, LK_SHARED); 3290 if (error != 0) 3291 return (EBADF); 3292 if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) { 3293 if (vp->v_type != VREG) { 3294 error = EINVAL; 3295 goto out; 3296 } 3297 if ((ap->a_flags & F_POSIX) != 0) 3298 cred = p->p_ucred; 3299 else 3300 cred = td->td_ucred; 3301 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 3302 if (VN_IS_DOOMED(vp)) { 3303 error = EBADF; 3304 goto out; 3305 } 3306 3307 /* 3308 * If this is unlocking a write locked region, flush and 3309 * commit them before unlocking. This is required by 3310 * RFC3530 Sec. 9.3.2. 3311 */ 3312 if (ap->a_op == F_UNLCK && 3313 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id, 3314 ap->a_flags)) 3315 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0); 3316 3317 /* 3318 * Mark NFS node as might have acquired a lock. 3319 * This is separate from NHASBEENLOCKED, because it must 3320 * be done before the nfsrpc_advlock() call, which might 3321 * add a nfscllock structure to the client state. 3322 * It is used to check for the case where a nfscllock 3323 * state structure cannot exist for the file. 3324 * Only done for "oneopenown" NFSv4.1/4.2 mounts. 3325 */ 3326 nmp = VFSTONFS(vp->v_mount); 3327 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp)) { 3328 NFSLOCKNODE(np); 3329 np->n_flag |= NMIGHTBELOCKED; 3330 NFSUNLOCKNODE(np); 3331 } 3332 3333 /* 3334 * Loop around doing the lock op, while a blocking lock 3335 * must wait for the lock op to succeed. 3336 */ 3337 do { 3338 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op, 3339 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags); 3340 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3341 ap->a_op == F_SETLK) { 3342 NFSVOPUNLOCK(vp); 3343 error = nfs_catnap(PZERO | PCATCH, ret, 3344 "ncladvl"); 3345 if (error) 3346 return (EINTR); 3347 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY); 3348 if (VN_IS_DOOMED(vp)) { 3349 error = EBADF; 3350 goto out; 3351 } 3352 } 3353 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3354 ap->a_op == F_SETLK); 3355 if (ret == NFSERR_DENIED) { 3356 error = EAGAIN; 3357 goto out; 3358 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) { 3359 error = ret; 3360 goto out; 3361 } else if (ret != 0) { 3362 error = EACCES; 3363 goto out; 3364 } 3365 3366 /* 3367 * Now, if we just got a lock, invalidate data in the buffer 3368 * cache, as required, so that the coherency conforms with 3369 * RFC3530 Sec. 9.3.2. 3370 */ 3371 if (ap->a_op == F_SETLK) { 3372 if ((np->n_flag & NMODIFIED) == 0) { 3373 np->n_attrstamp = 0; 3374 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3375 ret = VOP_GETATTR(vp, &va, cred); 3376 } 3377 if ((np->n_flag & NMODIFIED) || ret || 3378 np->n_change != va.va_filerev) { 3379 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1); 3380 np->n_attrstamp = 0; 3381 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3382 ret = VOP_GETATTR(vp, &va, cred); 3383 if (!ret) { 3384 np->n_mtime = va.va_mtime; 3385 np->n_change = va.va_filerev; 3386 } 3387 } 3388 /* Mark that a file lock has been acquired. */ 3389 NFSLOCKNODE(np); 3390 np->n_flag |= NHASBEENLOCKED; 3391 NFSUNLOCKNODE(np); 3392 } 3393 } else if (!NFS_ISV4(vp)) { 3394 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3395 size = VTONFS(vp)->n_size; 3396 NFSVOPUNLOCK(vp); 3397 error = lf_advlock(ap, &(vp->v_lockf), size); 3398 } else { 3399 if (nfs_advlock_p != NULL) 3400 error = nfs_advlock_p(ap); 3401 else { 3402 NFSVOPUNLOCK(vp); 3403 error = ENOLCK; 3404 } 3405 } 3406 if (error == 0 && ap->a_op == F_SETLK) { 3407 error = NFSVOPLOCK(vp, LK_SHARED); 3408 if (error == 0) { 3409 /* Mark that a file lock has been acquired. */ 3410 NFSLOCKNODE(np); 3411 np->n_flag |= NHASBEENLOCKED; 3412 NFSUNLOCKNODE(np); 3413 NFSVOPUNLOCK(vp); 3414 } 3415 } 3416 return (error); 3417 } else 3418 error = EOPNOTSUPP; 3419 out: 3420 NFSVOPUNLOCK(vp); 3421 return (error); 3422 } 3423 3424 /* 3425 * NFS advisory byte-level locks. 3426 */ 3427 static int 3428 nfs_advlockasync(struct vop_advlockasync_args *ap) 3429 { 3430 struct vnode *vp = ap->a_vp; 3431 u_quad_t size; 3432 int error; 3433 3434 if (NFS_ISV4(vp)) 3435 return (EOPNOTSUPP); 3436 error = NFSVOPLOCK(vp, LK_SHARED); 3437 if (error) 3438 return (error); 3439 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3440 size = VTONFS(vp)->n_size; 3441 NFSVOPUNLOCK(vp); 3442 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3443 } else { 3444 NFSVOPUNLOCK(vp); 3445 error = EOPNOTSUPP; 3446 } 3447 return (error); 3448 } 3449 3450 /* 3451 * Print out the contents of an nfsnode. 3452 */ 3453 static int 3454 nfs_print(struct vop_print_args *ap) 3455 { 3456 struct vnode *vp = ap->a_vp; 3457 struct nfsnode *np = VTONFS(vp); 3458 3459 printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid, 3460 (uintmax_t)np->n_vattr.na_fsid); 3461 if (vp->v_type == VFIFO) 3462 fifo_printinfo(vp); 3463 printf("\n"); 3464 return (0); 3465 } 3466 3467 /* 3468 * This is the "real" nfs::bwrite(struct buf*). 3469 * We set B_CACHE if this is a VMIO buffer. 3470 */ 3471 int 3472 ncl_writebp(struct buf *bp, int force __unused, struct thread *td) 3473 { 3474 int oldflags, rtval; 3475 3476 if (bp->b_flags & B_INVAL) { 3477 brelse(bp); 3478 return (0); 3479 } 3480 3481 oldflags = bp->b_flags; 3482 bp->b_flags |= B_CACHE; 3483 3484 /* 3485 * Undirty the bp. We will redirty it later if the I/O fails. 3486 */ 3487 bundirty(bp); 3488 bp->b_flags &= ~B_DONE; 3489 bp->b_ioflags &= ~BIO_ERROR; 3490 bp->b_iocmd = BIO_WRITE; 3491 3492 bufobj_wref(bp->b_bufobj); 3493 curthread->td_ru.ru_oublock++; 3494 3495 /* 3496 * Note: to avoid loopback deadlocks, we do not 3497 * assign b_runningbufspace. 3498 */ 3499 vfs_busy_pages(bp, 1); 3500 3501 BUF_KERNPROC(bp); 3502 bp->b_iooffset = dbtob(bp->b_blkno); 3503 bstrategy(bp); 3504 3505 if ((oldflags & B_ASYNC) != 0) 3506 return (0); 3507 3508 rtval = bufwait(bp); 3509 if (oldflags & B_DELWRI) 3510 reassignbuf(bp); 3511 brelse(bp); 3512 return (rtval); 3513 } 3514 3515 /* 3516 * nfs special file access vnode op. 3517 * Essentially just get vattr and then imitate iaccess() since the device is 3518 * local to the client. 3519 */ 3520 static int 3521 nfsspec_access(struct vop_access_args *ap) 3522 { 3523 struct vattr *vap; 3524 struct ucred *cred = ap->a_cred; 3525 struct vnode *vp = ap->a_vp; 3526 accmode_t accmode = ap->a_accmode; 3527 struct vattr vattr; 3528 int error; 3529 3530 /* 3531 * Disallow write attempts on filesystems mounted read-only; 3532 * unless the file is a socket, fifo, or a block or character 3533 * device resident on the filesystem. 3534 */ 3535 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3536 switch (vp->v_type) { 3537 case VREG: 3538 case VDIR: 3539 case VLNK: 3540 return (EROFS); 3541 default: 3542 break; 3543 } 3544 } 3545 vap = &vattr; 3546 error = VOP_GETATTR(vp, vap, cred); 3547 if (error) 3548 goto out; 3549 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3550 accmode, cred); 3551 out: 3552 return error; 3553 } 3554 3555 /* 3556 * Read wrapper for fifos. 3557 */ 3558 static int 3559 nfsfifo_read(struct vop_read_args *ap) 3560 { 3561 struct nfsnode *np = VTONFS(ap->a_vp); 3562 int error; 3563 3564 /* 3565 * Set access flag. 3566 */ 3567 NFSLOCKNODE(np); 3568 np->n_flag |= NACC; 3569 vfs_timestamp(&np->n_atim); 3570 NFSUNLOCKNODE(np); 3571 error = fifo_specops.vop_read(ap); 3572 return error; 3573 } 3574 3575 /* 3576 * Write wrapper for fifos. 3577 */ 3578 static int 3579 nfsfifo_write(struct vop_write_args *ap) 3580 { 3581 struct nfsnode *np = VTONFS(ap->a_vp); 3582 3583 /* 3584 * Set update flag. 3585 */ 3586 NFSLOCKNODE(np); 3587 np->n_flag |= NUPD; 3588 vfs_timestamp(&np->n_mtim); 3589 NFSUNLOCKNODE(np); 3590 return(fifo_specops.vop_write(ap)); 3591 } 3592 3593 /* 3594 * Close wrapper for fifos. 3595 * 3596 * Update the times on the nfsnode then do fifo close. 3597 */ 3598 static int 3599 nfsfifo_close(struct vop_close_args *ap) 3600 { 3601 struct vnode *vp = ap->a_vp; 3602 struct nfsnode *np = VTONFS(vp); 3603 struct vattr vattr; 3604 struct timespec ts; 3605 3606 NFSLOCKNODE(np); 3607 if (np->n_flag & (NACC | NUPD)) { 3608 vfs_timestamp(&ts); 3609 if (np->n_flag & NACC) 3610 np->n_atim = ts; 3611 if (np->n_flag & NUPD) 3612 np->n_mtim = ts; 3613 np->n_flag |= NCHG; 3614 if (vrefcnt(vp) == 1 && 3615 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3616 VATTR_NULL(&vattr); 3617 if (np->n_flag & NACC) 3618 vattr.va_atime = np->n_atim; 3619 if (np->n_flag & NUPD) 3620 vattr.va_mtime = np->n_mtim; 3621 NFSUNLOCKNODE(np); 3622 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3623 goto out; 3624 } 3625 } 3626 NFSUNLOCKNODE(np); 3627 out: 3628 return (fifo_specops.vop_close(ap)); 3629 } 3630 3631 /* 3632 * Just call ncl_writebp() with the force argument set to 1. 3633 * 3634 * NOTE: B_DONE may or may not be set in a_bp on call. 3635 */ 3636 static int 3637 nfs_bwrite(struct buf *bp) 3638 { 3639 3640 return (ncl_writebp(bp, 1, curthread)); 3641 } 3642 3643 struct buf_ops buf_ops_newnfs = { 3644 .bop_name = "buf_ops_nfs", 3645 .bop_write = nfs_bwrite, 3646 .bop_strategy = bufstrategy, 3647 .bop_sync = bufsync, 3648 .bop_bdflush = bufbdflush, 3649 }; 3650 3651 static int 3652 nfs_getacl(struct vop_getacl_args *ap) 3653 { 3654 int error; 3655 3656 if (ap->a_type != ACL_TYPE_NFS4) 3657 return (EOPNOTSUPP); 3658 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp); 3659 if (error > NFSERR_STALE) { 3660 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3661 error = EPERM; 3662 } 3663 return (error); 3664 } 3665 3666 static int 3667 nfs_setacl(struct vop_setacl_args *ap) 3668 { 3669 int error; 3670 3671 if (ap->a_type != ACL_TYPE_NFS4) 3672 return (EOPNOTSUPP); 3673 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp); 3674 if (error > NFSERR_STALE) { 3675 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3676 error = EPERM; 3677 } 3678 return (error); 3679 } 3680 3681 /* 3682 * VOP_ADVISE for NFS. 3683 * Just return 0 for any errors, since it is just a hint. 3684 */ 3685 static int 3686 nfs_advise(struct vop_advise_args *ap) 3687 { 3688 struct thread *td = curthread; 3689 struct nfsmount *nmp; 3690 uint64_t len; 3691 int error; 3692 3693 /* 3694 * First do vop_stdadvise() to handle the buffer cache. 3695 */ 3696 error = vop_stdadvise(ap); 3697 if (error != 0) 3698 return (error); 3699 if (ap->a_start < 0 || ap->a_end < 0) 3700 return (0); 3701 if (ap->a_end == OFF_MAX) 3702 len = 0; 3703 else if (ap->a_end < ap->a_start) 3704 return (0); 3705 else 3706 len = ap->a_end - ap->a_start + 1; 3707 nmp = VFSTONFS(ap->a_vp->v_mount); 3708 mtx_lock(&nmp->nm_mtx); 3709 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3710 (NFSHASPNFS(nmp) && (nmp->nm_privflag & NFSMNTP_IOADVISETHRUMDS) == 3711 0) || (nmp->nm_privflag & NFSMNTP_NOADVISE) != 0) { 3712 mtx_unlock(&nmp->nm_mtx); 3713 return (0); 3714 } 3715 mtx_unlock(&nmp->nm_mtx); 3716 error = nfsrpc_advise(ap->a_vp, ap->a_start, len, ap->a_advice, 3717 td->td_ucred, td); 3718 if (error == NFSERR_NOTSUPP) { 3719 mtx_lock(&nmp->nm_mtx); 3720 nmp->nm_privflag |= NFSMNTP_NOADVISE; 3721 mtx_unlock(&nmp->nm_mtx); 3722 } 3723 return (0); 3724 } 3725 3726 /* 3727 * nfs allocate call 3728 */ 3729 static int 3730 nfs_allocate(struct vop_allocate_args *ap) 3731 { 3732 struct vnode *vp = ap->a_vp; 3733 struct thread *td = curthread; 3734 struct nfsvattr nfsva; 3735 struct nfsmount *nmp; 3736 struct nfsnode *np; 3737 off_t alen; 3738 int attrflag, error, ret; 3739 struct timespec ts; 3740 struct uio io; 3741 3742 attrflag = 0; 3743 nmp = VFSTONFS(vp->v_mount); 3744 np = VTONFS(vp); 3745 mtx_lock(&nmp->nm_mtx); 3746 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION && 3747 (nmp->nm_privflag & NFSMNTP_NOALLOCATE) == 0) { 3748 mtx_unlock(&nmp->nm_mtx); 3749 alen = *ap->a_len; 3750 if ((uint64_t)alen > nfs_maxalloclen) 3751 alen = nfs_maxalloclen; 3752 3753 /* Check the file size limit. */ 3754 io.uio_offset = *ap->a_offset; 3755 io.uio_resid = alen; 3756 error = vn_rlimit_fsize(vp, &io, td); 3757 3758 /* 3759 * Flush first to ensure that the allocate adds to the 3760 * file's allocation on the server. 3761 */ 3762 if (error == 0) 3763 error = ncl_flush(vp, MNT_WAIT, td, 1, 0); 3764 if (error == 0) 3765 error = nfsrpc_allocate(vp, *ap->a_offset, alen, 3766 &nfsva, &attrflag, ap->a_cred, td); 3767 if (error == 0) { 3768 *ap->a_offset += alen; 3769 *ap->a_len -= alen; 3770 nanouptime(&ts); 3771 NFSLOCKNODE(np); 3772 np->n_localmodtime = ts; 3773 NFSUNLOCKNODE(np); 3774 } else if (error == NFSERR_NOTSUPP) { 3775 mtx_lock(&nmp->nm_mtx); 3776 nmp->nm_privflag |= NFSMNTP_NOALLOCATE; 3777 mtx_unlock(&nmp->nm_mtx); 3778 error = EINVAL; 3779 } 3780 } else { 3781 mtx_unlock(&nmp->nm_mtx); 3782 error = EINVAL; 3783 } 3784 if (attrflag != 0) { 3785 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 3786 if (error == 0 && ret != 0) 3787 error = ret; 3788 } 3789 if (error != 0) 3790 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 3791 return (error); 3792 } 3793 3794 /* 3795 * nfs deallocate call 3796 */ 3797 static int 3798 nfs_deallocate(struct vop_deallocate_args *ap) 3799 { 3800 struct vnode *vp = ap->a_vp; 3801 struct thread *td = curthread; 3802 struct nfsvattr nfsva; 3803 struct nfsmount *nmp; 3804 struct nfsnode *np; 3805 off_t tlen, mlen; 3806 int attrflag, error, ret; 3807 bool clipped; 3808 struct timespec ts; 3809 3810 error = 0; 3811 attrflag = 0; 3812 nmp = VFSTONFS(vp->v_mount); 3813 np = VTONFS(vp); 3814 mtx_lock(&nmp->nm_mtx); 3815 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION && 3816 (nmp->nm_privflag & NFSMNTP_NODEALLOCATE) == 0) { 3817 mtx_unlock(&nmp->nm_mtx); 3818 tlen = omin(OFF_MAX - *ap->a_offset, *ap->a_len); 3819 NFSCL_DEBUG(4, "dealloc: off=%jd len=%jd maxfilesize=%ju\n", 3820 (intmax_t)*ap->a_offset, (intmax_t)tlen, 3821 (uintmax_t)nmp->nm_maxfilesize); 3822 if ((uint64_t)*ap->a_offset >= nmp->nm_maxfilesize) { 3823 /* Avoid EFBIG error return from the NFSv4.2 server. */ 3824 *ap->a_len = 0; 3825 return (0); 3826 } 3827 clipped = false; 3828 if ((uint64_t)*ap->a_offset + tlen > nmp->nm_maxfilesize) 3829 tlen = nmp->nm_maxfilesize - *ap->a_offset; 3830 if ((uint64_t)*ap->a_offset < np->n_size) { 3831 /* Limit the len to nfs_maxalloclen before EOF. */ 3832 mlen = omin((off_t)np->n_size - *ap->a_offset, tlen); 3833 if ((uint64_t)mlen > nfs_maxalloclen) { 3834 NFSCL_DEBUG(4, "dealloc: tlen maxalloclen\n"); 3835 tlen = nfs_maxalloclen; 3836 clipped = true; 3837 } 3838 } 3839 if (error == 0) 3840 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 3841 if (error == 0) { 3842 vnode_pager_purge_range(vp, *ap->a_offset, 3843 *ap->a_offset + tlen); 3844 error = nfsrpc_deallocate(vp, *ap->a_offset, tlen, 3845 &nfsva, &attrflag, ap->a_cred, td); 3846 NFSCL_DEBUG(4, "dealloc: rpc=%d\n", error); 3847 } 3848 if (error == 0) { 3849 NFSCL_DEBUG(4, "dealloc: attrflag=%d na_size=%ju\n", 3850 attrflag, (uintmax_t)nfsva.na_size); 3851 nanouptime(&ts); 3852 NFSLOCKNODE(np); 3853 np->n_localmodtime = ts; 3854 NFSUNLOCKNODE(np); 3855 if (attrflag != 0) { 3856 if ((uint64_t)*ap->a_offset < nfsva.na_size) 3857 *ap->a_offset += omin((off_t) 3858 nfsva.na_size - *ap->a_offset, 3859 tlen); 3860 } 3861 if (clipped && tlen < *ap->a_len) 3862 *ap->a_len -= tlen; 3863 else 3864 *ap->a_len = 0; 3865 } else if (error == NFSERR_NOTSUPP) { 3866 mtx_lock(&nmp->nm_mtx); 3867 nmp->nm_privflag |= NFSMNTP_NODEALLOCATE; 3868 mtx_unlock(&nmp->nm_mtx); 3869 } 3870 } else { 3871 mtx_unlock(&nmp->nm_mtx); 3872 error = EIO; 3873 } 3874 /* 3875 * If the NFS server cannot perform the Deallocate operation, just call 3876 * vop_stddeallocate() to perform it. 3877 */ 3878 if (error != 0 && error != NFSERR_FBIG && error != NFSERR_INVAL) { 3879 error = vop_stddeallocate(ap); 3880 NFSCL_DEBUG(4, "dealloc: stddeallocate=%d\n", error); 3881 } 3882 if (attrflag != 0) { 3883 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 3884 if (error == 0 && ret != 0) 3885 error = ret; 3886 } 3887 if (error != 0) 3888 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 3889 return (error); 3890 } 3891 3892 /* 3893 * nfs copy_file_range call 3894 */ 3895 static int 3896 nfs_copy_file_range(struct vop_copy_file_range_args *ap) 3897 { 3898 struct vnode *invp = ap->a_invp; 3899 struct vnode *outvp = ap->a_outvp; 3900 struct mount *mp; 3901 struct nfsvattr innfsva, outnfsva; 3902 struct vattr *vap; 3903 struct uio io; 3904 struct nfsmount *nmp; 3905 size_t len, len2; 3906 int error, inattrflag, outattrflag, ret, ret2; 3907 off_t inoff, outoff; 3908 bool consecutive, must_commit, tryoutcred; 3909 3910 ret = ret2 = 0; 3911 nmp = VFSTONFS(invp->v_mount); 3912 mtx_lock(&nmp->nm_mtx); 3913 /* NFSv4.2 Copy is not permitted for infile == outfile. */ 3914 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3915 (nmp->nm_privflag & NFSMNTP_NOCOPY) != 0 || invp == outvp) { 3916 mtx_unlock(&nmp->nm_mtx); 3917 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 3918 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, 3919 ap->a_incred, ap->a_outcred, ap->a_fsizetd); 3920 return (error); 3921 } 3922 mtx_unlock(&nmp->nm_mtx); 3923 3924 /* Lock both vnodes, avoiding risk of deadlock. */ 3925 do { 3926 mp = NULL; 3927 error = vn_start_write(outvp, &mp, V_WAIT); 3928 if (error == 0) { 3929 error = vn_lock(outvp, LK_EXCLUSIVE); 3930 if (error == 0) { 3931 error = vn_lock(invp, LK_SHARED | LK_NOWAIT); 3932 if (error == 0) 3933 break; 3934 VOP_UNLOCK(outvp); 3935 if (mp != NULL) 3936 vn_finished_write(mp); 3937 mp = NULL; 3938 error = vn_lock(invp, LK_SHARED); 3939 if (error == 0) 3940 VOP_UNLOCK(invp); 3941 } 3942 } 3943 if (mp != NULL) 3944 vn_finished_write(mp); 3945 } while (error == 0); 3946 if (error != 0) 3947 return (error); 3948 3949 /* 3950 * Do the vn_rlimit_fsize() check. Should this be above the VOP layer? 3951 */ 3952 io.uio_offset = *ap->a_outoffp; 3953 io.uio_resid = *ap->a_lenp; 3954 error = vn_rlimit_fsize(outvp, &io, ap->a_fsizetd); 3955 3956 /* 3957 * Flush the input file so that the data is up to date before 3958 * the copy. Flush writes for the output file so that they 3959 * do not overwrite the data copied to the output file by the Copy. 3960 * Set the commit argument for both flushes so that the data is on 3961 * stable storage before the Copy RPC. This is done in case the 3962 * server reboots during the Copy and needs to be redone. 3963 */ 3964 if (error == 0) 3965 error = ncl_flush(invp, MNT_WAIT, curthread, 1, 0); 3966 if (error == 0) 3967 error = ncl_flush(outvp, MNT_WAIT, curthread, 1, 0); 3968 3969 /* Do the actual NFSv4.2 RPC. */ 3970 len = *ap->a_lenp; 3971 mtx_lock(&nmp->nm_mtx); 3972 if ((nmp->nm_privflag & NFSMNTP_NOCONSECUTIVE) == 0) 3973 consecutive = true; 3974 else 3975 consecutive = false; 3976 mtx_unlock(&nmp->nm_mtx); 3977 inoff = *ap->a_inoffp; 3978 outoff = *ap->a_outoffp; 3979 tryoutcred = true; 3980 must_commit = false; 3981 if (error == 0) { 3982 vap = &VTONFS(invp)->n_vattr.na_vattr; 3983 error = VOP_GETATTR(invp, vap, ap->a_incred); 3984 if (error == 0) { 3985 /* 3986 * Clip "len" at va_size so that RFC compliant servers 3987 * will not reply NFSERR_INVAL. 3988 * Setting "len == 0" for the RPC would be preferred, 3989 * but some Linux servers do not support that. 3990 */ 3991 if (inoff >= vap->va_size) 3992 *ap->a_lenp = len = 0; 3993 else if (inoff + len > vap->va_size) 3994 *ap->a_lenp = len = vap->va_size - inoff; 3995 } else 3996 error = 0; 3997 } 3998 3999 /* 4000 * len will be set to 0 upon a successful Copy RPC. 4001 * As such, this only loops when the Copy RPC needs to be retried. 4002 */ 4003 while (len > 0 && error == 0) { 4004 inattrflag = outattrflag = 0; 4005 len2 = len; 4006 if (tryoutcred) 4007 error = nfsrpc_copy_file_range(invp, ap->a_inoffp, 4008 outvp, ap->a_outoffp, &len2, ap->a_flags, 4009 &inattrflag, &innfsva, &outattrflag, &outnfsva, 4010 ap->a_outcred, consecutive, &must_commit); 4011 else 4012 error = nfsrpc_copy_file_range(invp, ap->a_inoffp, 4013 outvp, ap->a_outoffp, &len2, ap->a_flags, 4014 &inattrflag, &innfsva, &outattrflag, &outnfsva, 4015 ap->a_incred, consecutive, &must_commit); 4016 if (inattrflag != 0) 4017 ret = nfscl_loadattrcache(&invp, &innfsva, NULL, 0, 1); 4018 if (outattrflag != 0) 4019 ret2 = nfscl_loadattrcache(&outvp, &outnfsva, NULL, 4020 1, 1); 4021 if (error == 0) { 4022 if (consecutive == false) { 4023 if (len2 == len) { 4024 mtx_lock(&nmp->nm_mtx); 4025 nmp->nm_privflag |= 4026 NFSMNTP_NOCONSECUTIVE; 4027 mtx_unlock(&nmp->nm_mtx); 4028 } else 4029 error = NFSERR_OFFLOADNOREQS; 4030 } 4031 *ap->a_lenp = len2; 4032 len = 0; 4033 if (len2 > 0 && must_commit && error == 0) 4034 error = ncl_commit(outvp, outoff, *ap->a_lenp, 4035 ap->a_outcred, curthread); 4036 if (error == 0 && ret != 0) 4037 error = ret; 4038 if (error == 0 && ret2 != 0) 4039 error = ret2; 4040 } else if (error == NFSERR_OFFLOADNOREQS && consecutive) { 4041 /* 4042 * Try consecutive == false, which is ok only if all 4043 * bytes are copied. 4044 * If only some bytes were copied when consecutive 4045 * is false, there is no way to know which bytes 4046 * still need to be written. 4047 */ 4048 consecutive = false; 4049 error = 0; 4050 } else if (error == NFSERR_ACCES && tryoutcred) { 4051 /* Try again with incred. */ 4052 tryoutcred = false; 4053 error = 0; 4054 } 4055 if (error == NFSERR_STALEWRITEVERF) { 4056 /* 4057 * Server rebooted, so do it all again. 4058 */ 4059 *ap->a_inoffp = inoff; 4060 *ap->a_outoffp = outoff; 4061 len = *ap->a_lenp; 4062 must_commit = false; 4063 error = 0; 4064 } 4065 } 4066 VOP_UNLOCK(invp); 4067 VOP_UNLOCK(outvp); 4068 if (mp != NULL) 4069 vn_finished_write(mp); 4070 if (error == NFSERR_NOTSUPP || error == NFSERR_OFFLOADNOREQS || 4071 error == NFSERR_ACCES) { 4072 /* 4073 * Unlike the NFSv4.2 Copy, vn_generic_copy_file_range() can 4074 * use a_incred for the read and a_outcred for the write, so 4075 * try this for NFSERR_ACCES failures for the Copy. 4076 * For NFSERR_NOTSUPP and NFSERR_OFFLOADNOREQS, the Copy can 4077 * never succeed, so disable it. 4078 */ 4079 if (error != NFSERR_ACCES) { 4080 /* Can never do Copy on this mount. */ 4081 mtx_lock(&nmp->nm_mtx); 4082 nmp->nm_privflag |= NFSMNTP_NOCOPY; 4083 mtx_unlock(&nmp->nm_mtx); 4084 } 4085 *ap->a_inoffp = inoff; 4086 *ap->a_outoffp = outoff; 4087 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 4088 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, 4089 ap->a_incred, ap->a_outcred, ap->a_fsizetd); 4090 } else if (error != 0) 4091 *ap->a_lenp = 0; 4092 4093 if (error != 0) 4094 error = nfscl_maperr(curthread, error, (uid_t)0, (gid_t)0); 4095 return (error); 4096 } 4097 4098 /* 4099 * nfs ioctl call 4100 */ 4101 static int 4102 nfs_ioctl(struct vop_ioctl_args *ap) 4103 { 4104 struct vnode *vp = ap->a_vp; 4105 struct nfsvattr nfsva; 4106 struct nfsmount *nmp; 4107 int attrflag, content, error, ret; 4108 bool eof = false; /* shut up compiler. */ 4109 4110 if (vp->v_type != VREG) 4111 return (ENOTTY); 4112 nmp = VFSTONFS(vp->v_mount); 4113 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) { 4114 error = vop_stdioctl(ap); 4115 return (error); 4116 } 4117 4118 /* Do the actual NFSv4.2 RPC. */ 4119 switch (ap->a_command) { 4120 case FIOSEEKDATA: 4121 content = NFSV4CONTENT_DATA; 4122 break; 4123 case FIOSEEKHOLE: 4124 content = NFSV4CONTENT_HOLE; 4125 break; 4126 default: 4127 return (ENOTTY); 4128 } 4129 4130 error = vn_lock(vp, LK_SHARED); 4131 if (error != 0) 4132 return (EBADF); 4133 attrflag = 0; 4134 if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size) 4135 error = ENXIO; 4136 else { 4137 /* 4138 * Flush all writes, so that the server is up to date. 4139 * Although a Commit is not required, the commit argument 4140 * is set so that, for a pNFS File/Flexible File Layout 4141 * server, the LayoutCommit will be done to ensure the file 4142 * size is up to date on the Metadata Server. 4143 */ 4144 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0); 4145 if (error == 0) 4146 error = nfsrpc_seek(vp, (off_t *)ap->a_data, &eof, 4147 content, ap->a_cred, &nfsva, &attrflag); 4148 /* If at eof for FIOSEEKDATA, return ENXIO. */ 4149 if (eof && error == 0 && content == NFSV4CONTENT_DATA) 4150 error = ENXIO; 4151 } 4152 if (attrflag != 0) { 4153 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4154 if (error == 0 && ret != 0) 4155 error = ret; 4156 } 4157 NFSVOPUNLOCK(vp); 4158 4159 if (error != 0) 4160 error = ENXIO; 4161 return (error); 4162 } 4163 4164 /* 4165 * nfs getextattr call 4166 */ 4167 static int 4168 nfs_getextattr(struct vop_getextattr_args *ap) 4169 { 4170 struct vnode *vp = ap->a_vp; 4171 struct nfsmount *nmp; 4172 struct ucred *cred; 4173 struct thread *td = ap->a_td; 4174 struct nfsvattr nfsva; 4175 ssize_t len; 4176 int attrflag, error, ret; 4177 4178 nmp = VFSTONFS(vp->v_mount); 4179 mtx_lock(&nmp->nm_mtx); 4180 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4181 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4182 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4183 mtx_unlock(&nmp->nm_mtx); 4184 return (EOPNOTSUPP); 4185 } 4186 mtx_unlock(&nmp->nm_mtx); 4187 4188 cred = ap->a_cred; 4189 if (cred == NULL) 4190 cred = td->td_ucred; 4191 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4192 attrflag = 0; 4193 error = nfsrpc_getextattr(vp, ap->a_name, ap->a_uio, &len, &nfsva, 4194 &attrflag, cred, td); 4195 if (attrflag != 0) { 4196 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4197 if (error == 0 && ret != 0) 4198 error = ret; 4199 } 4200 if (error == 0 && ap->a_size != NULL) 4201 *ap->a_size = len; 4202 4203 switch (error) { 4204 case NFSERR_NOTSUPP: 4205 case NFSERR_OPILLEGAL: 4206 mtx_lock(&nmp->nm_mtx); 4207 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4208 mtx_unlock(&nmp->nm_mtx); 4209 error = EOPNOTSUPP; 4210 break; 4211 case NFSERR_NOXATTR: 4212 case NFSERR_XATTR2BIG: 4213 error = ENOATTR; 4214 break; 4215 default: 4216 error = nfscl_maperr(td, error, 0, 0); 4217 break; 4218 } 4219 return (error); 4220 } 4221 4222 /* 4223 * nfs setextattr call 4224 */ 4225 static int 4226 nfs_setextattr(struct vop_setextattr_args *ap) 4227 { 4228 struct vnode *vp = ap->a_vp; 4229 struct nfsmount *nmp; 4230 struct ucred *cred; 4231 struct thread *td = ap->a_td; 4232 struct nfsvattr nfsva; 4233 int attrflag, error, ret; 4234 4235 nmp = VFSTONFS(vp->v_mount); 4236 mtx_lock(&nmp->nm_mtx); 4237 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4238 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4239 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4240 mtx_unlock(&nmp->nm_mtx); 4241 return (EOPNOTSUPP); 4242 } 4243 mtx_unlock(&nmp->nm_mtx); 4244 4245 if (ap->a_uio->uio_resid < 0) 4246 return (EINVAL); 4247 cred = ap->a_cred; 4248 if (cred == NULL) 4249 cred = td->td_ucred; 4250 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4251 attrflag = 0; 4252 error = nfsrpc_setextattr(vp, ap->a_name, ap->a_uio, &nfsva, 4253 &attrflag, cred, td); 4254 if (attrflag != 0) { 4255 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4256 if (error == 0 && ret != 0) 4257 error = ret; 4258 } 4259 4260 switch (error) { 4261 case NFSERR_NOTSUPP: 4262 case NFSERR_OPILLEGAL: 4263 mtx_lock(&nmp->nm_mtx); 4264 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4265 mtx_unlock(&nmp->nm_mtx); 4266 error = EOPNOTSUPP; 4267 break; 4268 case NFSERR_NOXATTR: 4269 case NFSERR_XATTR2BIG: 4270 error = ENOATTR; 4271 break; 4272 default: 4273 error = nfscl_maperr(td, error, 0, 0); 4274 break; 4275 } 4276 return (error); 4277 } 4278 4279 /* 4280 * nfs listextattr call 4281 */ 4282 static int 4283 nfs_listextattr(struct vop_listextattr_args *ap) 4284 { 4285 struct vnode *vp = ap->a_vp; 4286 struct nfsmount *nmp; 4287 struct ucred *cred; 4288 struct thread *td = ap->a_td; 4289 struct nfsvattr nfsva; 4290 size_t len, len2; 4291 uint64_t cookie; 4292 int attrflag, error, ret; 4293 bool eof; 4294 4295 nmp = VFSTONFS(vp->v_mount); 4296 mtx_lock(&nmp->nm_mtx); 4297 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4298 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4299 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4300 mtx_unlock(&nmp->nm_mtx); 4301 return (EOPNOTSUPP); 4302 } 4303 mtx_unlock(&nmp->nm_mtx); 4304 4305 cred = ap->a_cred; 4306 if (cred == NULL) 4307 cred = td->td_ucred; 4308 4309 /* Loop around doing List Extended Attribute RPCs. */ 4310 eof = false; 4311 cookie = 0; 4312 len2 = 0; 4313 error = 0; 4314 while (!eof && error == 0) { 4315 len = nmp->nm_rsize; 4316 attrflag = 0; 4317 error = nfsrpc_listextattr(vp, &cookie, ap->a_uio, &len, &eof, 4318 &nfsva, &attrflag, cred, td); 4319 if (attrflag != 0) { 4320 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4321 if (error == 0 && ret != 0) 4322 error = ret; 4323 } 4324 if (error == 0) { 4325 len2 += len; 4326 if (len2 > SSIZE_MAX) 4327 error = ENOATTR; 4328 } 4329 } 4330 if (error == 0 && ap->a_size != NULL) 4331 *ap->a_size = len2; 4332 4333 switch (error) { 4334 case NFSERR_NOTSUPP: 4335 case NFSERR_OPILLEGAL: 4336 mtx_lock(&nmp->nm_mtx); 4337 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4338 mtx_unlock(&nmp->nm_mtx); 4339 error = EOPNOTSUPP; 4340 break; 4341 case NFSERR_NOXATTR: 4342 case NFSERR_XATTR2BIG: 4343 error = ENOATTR; 4344 break; 4345 default: 4346 error = nfscl_maperr(td, error, 0, 0); 4347 break; 4348 } 4349 return (error); 4350 } 4351 4352 /* 4353 * nfs setextattr call 4354 */ 4355 static int 4356 nfs_deleteextattr(struct vop_deleteextattr_args *ap) 4357 { 4358 struct vnode *vp = ap->a_vp; 4359 struct nfsmount *nmp; 4360 struct nfsvattr nfsva; 4361 int attrflag, error, ret; 4362 4363 nmp = VFSTONFS(vp->v_mount); 4364 mtx_lock(&nmp->nm_mtx); 4365 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4366 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4367 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4368 mtx_unlock(&nmp->nm_mtx); 4369 return (EOPNOTSUPP); 4370 } 4371 mtx_unlock(&nmp->nm_mtx); 4372 4373 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4374 attrflag = 0; 4375 error = nfsrpc_rmextattr(vp, ap->a_name, &nfsva, &attrflag, ap->a_cred, 4376 ap->a_td); 4377 if (attrflag != 0) { 4378 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4379 if (error == 0 && ret != 0) 4380 error = ret; 4381 } 4382 4383 switch (error) { 4384 case NFSERR_NOTSUPP: 4385 case NFSERR_OPILLEGAL: 4386 mtx_lock(&nmp->nm_mtx); 4387 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4388 mtx_unlock(&nmp->nm_mtx); 4389 error = EOPNOTSUPP; 4390 break; 4391 case NFSERR_NOXATTR: 4392 case NFSERR_XATTR2BIG: 4393 error = ENOATTR; 4394 break; 4395 default: 4396 error = nfscl_maperr(ap->a_td, error, 0, 0); 4397 break; 4398 } 4399 return (error); 4400 } 4401 4402 /* 4403 * Return POSIX pathconf information applicable to nfs filesystems. 4404 */ 4405 static int 4406 nfs_pathconf(struct vop_pathconf_args *ap) 4407 { 4408 struct nfsv3_pathconf pc; 4409 struct nfsvattr nfsva; 4410 struct vnode *vp = ap->a_vp; 4411 struct nfsmount *nmp; 4412 struct thread *td = curthread; 4413 off_t off; 4414 bool eof; 4415 int attrflag, error; 4416 4417 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX || 4418 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED || 4419 ap->a_name == _PC_NO_TRUNC)) || 4420 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) { 4421 /* 4422 * Since only the above 4 a_names are returned by the NFSv3 4423 * Pathconf RPC, there is no point in doing it for others. 4424 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can 4425 * be used for _PC_NFS4_ACL as well. 4426 */ 4427 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva, 4428 &attrflag); 4429 if (attrflag != 0) 4430 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1); 4431 if (error != 0) 4432 return (error); 4433 } else { 4434 /* 4435 * For NFSv2 (or NFSv3 when not one of the above 4 a_names), 4436 * just fake them. 4437 */ 4438 pc.pc_linkmax = NFS_LINK_MAX; 4439 pc.pc_namemax = NFS_MAXNAMLEN; 4440 pc.pc_notrunc = 1; 4441 pc.pc_chownrestricted = 1; 4442 pc.pc_caseinsensitive = 0; 4443 pc.pc_casepreserving = 1; 4444 error = 0; 4445 } 4446 switch (ap->a_name) { 4447 case _PC_LINK_MAX: 4448 #ifdef _LP64 4449 *ap->a_retval = pc.pc_linkmax; 4450 #else 4451 *ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax); 4452 #endif 4453 break; 4454 case _PC_NAME_MAX: 4455 *ap->a_retval = pc.pc_namemax; 4456 break; 4457 case _PC_PIPE_BUF: 4458 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 4459 *ap->a_retval = PIPE_BUF; 4460 else 4461 error = EINVAL; 4462 break; 4463 case _PC_CHOWN_RESTRICTED: 4464 *ap->a_retval = pc.pc_chownrestricted; 4465 break; 4466 case _PC_NO_TRUNC: 4467 *ap->a_retval = pc.pc_notrunc; 4468 break; 4469 case _PC_ACL_NFS4: 4470 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 && 4471 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL)) 4472 *ap->a_retval = 1; 4473 else 4474 *ap->a_retval = 0; 4475 break; 4476 case _PC_ACL_PATH_MAX: 4477 if (NFS_ISV4(vp)) 4478 *ap->a_retval = ACL_MAX_ENTRIES; 4479 else 4480 *ap->a_retval = 3; 4481 break; 4482 case _PC_PRIO_IO: 4483 *ap->a_retval = 0; 4484 break; 4485 case _PC_SYNC_IO: 4486 *ap->a_retval = 0; 4487 break; 4488 case _PC_ALLOC_SIZE_MIN: 4489 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize; 4490 break; 4491 case _PC_FILESIZEBITS: 4492 if (NFS_ISV34(vp)) 4493 *ap->a_retval = 64; 4494 else 4495 *ap->a_retval = 32; 4496 break; 4497 case _PC_REC_INCR_XFER_SIZE: 4498 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4499 break; 4500 case _PC_REC_MAX_XFER_SIZE: 4501 *ap->a_retval = -1; /* means ``unlimited'' */ 4502 break; 4503 case _PC_REC_MIN_XFER_SIZE: 4504 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4505 break; 4506 case _PC_REC_XFER_ALIGN: 4507 *ap->a_retval = PAGE_SIZE; 4508 break; 4509 case _PC_SYMLINK_MAX: 4510 *ap->a_retval = NFS_MAXPATHLEN; 4511 break; 4512 case _PC_MIN_HOLE_SIZE: 4513 /* Only some NFSv4.2 servers support Seek for Holes. */ 4514 *ap->a_retval = 0; 4515 nmp = VFSTONFS(vp->v_mount); 4516 if (NFS_ISV4(vp) && nmp->nm_minorvers == NFSV42_MINORVERSION) { 4517 /* 4518 * NFSv4.2 doesn't have an attribute for hole size, 4519 * so all we can do is see if the Seek operation is 4520 * supported and then use f_iosize as a "best guess". 4521 */ 4522 mtx_lock(&nmp->nm_mtx); 4523 if ((nmp->nm_privflag & NFSMNTP_SEEKTESTED) == 0) { 4524 mtx_unlock(&nmp->nm_mtx); 4525 off = 0; 4526 attrflag = 0; 4527 error = nfsrpc_seek(vp, &off, &eof, 4528 NFSV4CONTENT_HOLE, td->td_ucred, &nfsva, 4529 &attrflag); 4530 if (attrflag != 0) 4531 nfscl_loadattrcache(&vp, &nfsva, 4532 NULL, 0, 1); 4533 mtx_lock(&nmp->nm_mtx); 4534 if (error == NFSERR_NOTSUPP) 4535 nmp->nm_privflag |= NFSMNTP_SEEKTESTED; 4536 else 4537 nmp->nm_privflag |= NFSMNTP_SEEKTESTED | 4538 NFSMNTP_SEEK; 4539 error = 0; 4540 } 4541 if ((nmp->nm_privflag & NFSMNTP_SEEK) != 0) 4542 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4543 mtx_unlock(&nmp->nm_mtx); 4544 } 4545 break; 4546 4547 default: 4548 error = vop_stdpathconf(ap); 4549 break; 4550 } 4551 return (error); 4552 } 4553