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sys/fs/nfsclient/nfs_clvnops.c
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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_copy_file_range_t nfs_copy_file_range; 150 static vop_ioctl_t nfs_ioctl; 151 static vop_getextattr_t nfs_getextattr; 152 static vop_setextattr_t nfs_setextattr; 153 static vop_listextattr_t nfs_listextattr; 154 static vop_deleteextattr_t nfs_deleteextattr; 155 static vop_lock1_t nfs_lock; 156 157 /* 158 * Global vfs data structures for nfs 159 */ 160 161 static struct vop_vector newnfs_vnodeops_nosig = { 162 .vop_default = &default_vnodeops, 163 .vop_access = nfs_access, 164 .vop_advlock = nfs_advlock, 165 .vop_advlockasync = nfs_advlockasync, 166 .vop_close = nfs_close, 167 .vop_create = nfs_create, 168 .vop_fsync = nfs_fsync, 169 .vop_getattr = nfs_getattr, 170 .vop_getpages = ncl_getpages, 171 .vop_putpages = ncl_putpages, 172 .vop_inactive = ncl_inactive, 173 .vop_link = nfs_link, 174 .vop_lock1 = nfs_lock, 175 .vop_lookup = nfs_lookup, 176 .vop_mkdir = nfs_mkdir, 177 .vop_mknod = nfs_mknod, 178 .vop_open = nfs_open, 179 .vop_pathconf = nfs_pathconf, 180 .vop_print = nfs_print, 181 .vop_read = nfs_read, 182 .vop_readdir = nfs_readdir, 183 .vop_readlink = nfs_readlink, 184 .vop_reclaim = ncl_reclaim, 185 .vop_remove = nfs_remove, 186 .vop_rename = nfs_rename, 187 .vop_rmdir = nfs_rmdir, 188 .vop_setattr = nfs_setattr, 189 .vop_strategy = nfs_strategy, 190 .vop_symlink = nfs_symlink, 191 .vop_write = ncl_write, 192 .vop_getacl = nfs_getacl, 193 .vop_setacl = nfs_setacl, 194 .vop_advise = nfs_advise, 195 .vop_allocate = nfs_allocate, 196 .vop_copy_file_range = nfs_copy_file_range, 197 .vop_ioctl = nfs_ioctl, 198 .vop_getextattr = nfs_getextattr, 199 .vop_setextattr = nfs_setextattr, 200 .vop_listextattr = nfs_listextattr, 201 .vop_deleteextattr = nfs_deleteextattr, 202 }; 203 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops_nosig); 204 205 static int 206 nfs_vnodeops_bypass(struct vop_generic_args *a) 207 { 208 209 return (vop_sigdefer(&newnfs_vnodeops_nosig, a)); 210 } 211 212 struct vop_vector newnfs_vnodeops = { 213 .vop_default = &default_vnodeops, 214 .vop_bypass = nfs_vnodeops_bypass, 215 }; 216 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops); 217 218 static struct vop_vector newnfs_fifoops_nosig = { 219 .vop_default = &fifo_specops, 220 .vop_access = nfsspec_access, 221 .vop_close = nfsfifo_close, 222 .vop_fsync = nfs_fsync, 223 .vop_getattr = nfs_getattr, 224 .vop_inactive = ncl_inactive, 225 .vop_pathconf = nfs_pathconf, 226 .vop_print = nfs_print, 227 .vop_read = nfsfifo_read, 228 .vop_reclaim = ncl_reclaim, 229 .vop_setattr = nfs_setattr, 230 .vop_write = nfsfifo_write, 231 }; 232 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops_nosig); 233 234 static int 235 nfs_fifoops_bypass(struct vop_generic_args *a) 236 { 237 238 return (vop_sigdefer(&newnfs_fifoops_nosig, a)); 239 } 240 241 struct vop_vector newnfs_fifoops = { 242 .vop_default = &default_vnodeops, 243 .vop_bypass = nfs_fifoops_bypass, 244 }; 245 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops); 246 247 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 248 struct componentname *cnp, struct vattr *vap); 249 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 250 int namelen, struct ucred *cred, struct thread *td); 251 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, 252 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp, 253 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td); 254 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp, 255 struct componentname *scnp, struct sillyrename *sp); 256 257 /* 258 * Global variables 259 */ 260 SYSCTL_DECL(_vfs_nfs); 261 262 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 263 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 264 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 265 266 static int nfs_prime_access_cache = 0; 267 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW, 268 &nfs_prime_access_cache, 0, 269 "Prime NFS ACCESS cache when fetching attributes"); 270 271 static int newnfs_commit_on_close = 0; 272 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW, 273 &newnfs_commit_on_close, 0, "write+commit on close, else only write"); 274 275 static int nfs_clean_pages_on_close = 1; 276 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, 277 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); 278 279 int newnfs_directio_enable = 0; 280 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 281 &newnfs_directio_enable, 0, "Enable NFS directio"); 282 283 int nfs_keep_dirty_on_error; 284 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW, 285 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned"); 286 287 /* 288 * This sysctl allows other processes to mmap a file that has been opened 289 * O_DIRECT by a process. In general, having processes mmap the file while 290 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 291 * this by default to prevent DoS attacks - to prevent a malicious user from 292 * opening up files O_DIRECT preventing other users from mmap'ing these 293 * files. "Protected" environments where stricter consistency guarantees are 294 * required can disable this knob. The process that opened the file O_DIRECT 295 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 296 * meaningful. 297 */ 298 int newnfs_directio_allow_mmap = 1; 299 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 300 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 301 302 static uint64_t nfs_maxalloclen = 64 * 1024 * 1024; 303 SYSCTL_U64(_vfs_nfs, OID_AUTO, maxalloclen, CTLFLAG_RW, 304 &nfs_maxalloclen, 0, "NFS max allocate/deallocate length"); 305 306 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \ 307 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \ 308 | NFSACCESS_DELETE | NFSACCESS_LOOKUP) 309 310 /* 311 * SMP Locking Note : 312 * The list of locks after the description of the lock is the ordering 313 * of other locks acquired with the lock held. 314 * np->n_mtx : Protects the fields in the nfsnode. 315 VM Object Lock 316 VI_MTX (acquired indirectly) 317 * nmp->nm_mtx : Protects the fields in the nfsmount. 318 rep->r_mtx 319 * ncl_iod_mutex : Global lock, protects shared nfsiod state. 320 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. 321 nmp->nm_mtx 322 rep->r_mtx 323 * rep->r_mtx : Protects the fields in an nfsreq. 324 */ 325 326 static int 327 nfs_lock(struct vop_lock1_args *ap) 328 { 329 struct vnode *vp; 330 struct nfsnode *np; 331 u_quad_t nsize; 332 int error, lktype; 333 bool onfault; 334 335 vp = ap->a_vp; 336 lktype = ap->a_flags & LK_TYPE_MASK; 337 error = VOP_LOCK1_APV(&default_vnodeops, ap); 338 if (error != 0 || vp->v_op != &newnfs_vnodeops) 339 return (error); 340 np = VTONFS(vp); 341 if (np == NULL) 342 return (0); 343 NFSLOCKNODE(np); 344 if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED && 345 lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE && 346 lktype != LK_TRYUPGRADE)) { 347 NFSUNLOCKNODE(np); 348 return (0); 349 } 350 onfault = (ap->a_flags & LK_EATTR_MASK) == LK_NOWAIT && 351 (ap->a_flags & LK_INIT_MASK) == LK_CANRECURSE && 352 (lktype == LK_SHARED || lktype == LK_EXCLUSIVE); 353 if (onfault && vp->v_vnlock->lk_recurse == 0) { 354 /* 355 * Force retry in vm_fault(), to make the lock request 356 * sleepable, which allows us to piggy-back the 357 * sleepable call to vnode_pager_setsize(). 358 */ 359 NFSUNLOCKNODE(np); 360 VOP_UNLOCK(vp); 361 return (EBUSY); 362 } 363 if ((ap->a_flags & LK_NOWAIT) != 0 || 364 (lktype == LK_SHARED && vp->v_vnlock->lk_recurse > 0)) { 365 NFSUNLOCKNODE(np); 366 return (0); 367 } 368 if (lktype == LK_SHARED) { 369 NFSUNLOCKNODE(np); 370 VOP_UNLOCK(vp); 371 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 372 ap->a_flags |= LK_EXCLUSIVE; 373 error = VOP_LOCK1_APV(&default_vnodeops, ap); 374 if (error != 0 || vp->v_op != &newnfs_vnodeops) 375 return (error); 376 if (vp->v_data == NULL) 377 goto downgrade; 378 MPASS(vp->v_data == np); 379 NFSLOCKNODE(np); 380 if ((np->n_flag & NVNSETSZSKIP) == 0) { 381 NFSUNLOCKNODE(np); 382 goto downgrade; 383 } 384 } 385 np->n_flag &= ~NVNSETSZSKIP; 386 nsize = np->n_size; 387 NFSUNLOCKNODE(np); 388 vnode_pager_setsize(vp, nsize); 389 downgrade: 390 if (lktype == LK_SHARED) { 391 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK); 392 ap->a_flags |= LK_DOWNGRADE; 393 (void)VOP_LOCK1_APV(&default_vnodeops, ap); 394 } 395 return (0); 396 } 397 398 static int 399 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td, 400 struct ucred *cred, u_int32_t *retmode) 401 { 402 int error = 0, attrflag, i, lrupos; 403 u_int32_t rmode; 404 struct nfsnode *np = VTONFS(vp); 405 struct nfsvattr nfsva; 406 407 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag, 408 &rmode, NULL); 409 if (attrflag) 410 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 411 if (!error) { 412 lrupos = 0; 413 NFSLOCKNODE(np); 414 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 415 if (np->n_accesscache[i].uid == cred->cr_uid) { 416 np->n_accesscache[i].mode = rmode; 417 np->n_accesscache[i].stamp = time_second; 418 break; 419 } 420 if (i > 0 && np->n_accesscache[i].stamp < 421 np->n_accesscache[lrupos].stamp) 422 lrupos = i; 423 } 424 if (i == NFS_ACCESSCACHESIZE) { 425 np->n_accesscache[lrupos].uid = cred->cr_uid; 426 np->n_accesscache[lrupos].mode = rmode; 427 np->n_accesscache[lrupos].stamp = time_second; 428 } 429 NFSUNLOCKNODE(np); 430 if (retmode != NULL) 431 *retmode = rmode; 432 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0); 433 } else if (NFS_ISV4(vp)) { 434 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 435 } 436 #ifdef KDTRACE_HOOKS 437 if (error != 0) 438 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0, 439 error); 440 #endif 441 return (error); 442 } 443 444 /* 445 * nfs access vnode op. 446 * For nfs version 2, just return ok. File accesses may fail later. 447 * For nfs version 3, use the access rpc to check accessibility. If file modes 448 * are changed on the server, accesses might still fail later. 449 */ 450 static int 451 nfs_access(struct vop_access_args *ap) 452 { 453 struct vnode *vp = ap->a_vp; 454 int error = 0, i, gotahit; 455 u_int32_t mode, wmode, rmode; 456 int v34 = NFS_ISV34(vp); 457 struct nfsnode *np = VTONFS(vp); 458 459 /* 460 * Disallow write attempts on filesystems mounted read-only; 461 * unless the file is a socket, fifo, or a block or character 462 * device resident on the filesystem. 463 */ 464 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS | 465 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL | 466 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { 467 switch (vp->v_type) { 468 case VREG: 469 case VDIR: 470 case VLNK: 471 return (EROFS); 472 default: 473 break; 474 } 475 } 476 /* 477 * For nfs v3 or v4, check to see if we have done this recently, and if 478 * so return our cached result instead of making an ACCESS call. 479 * If not, do an access rpc, otherwise you are stuck emulating 480 * ufs_access() locally using the vattr. This may not be correct, 481 * since the server may apply other access criteria such as 482 * client uid-->server uid mapping that we do not know about. 483 */ 484 if (v34) { 485 if (ap->a_accmode & VREAD) 486 mode = NFSACCESS_READ; 487 else 488 mode = 0; 489 if (vp->v_type != VDIR) { 490 if (ap->a_accmode & VWRITE) 491 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 492 if (ap->a_accmode & VAPPEND) 493 mode |= NFSACCESS_EXTEND; 494 if (ap->a_accmode & VEXEC) 495 mode |= NFSACCESS_EXECUTE; 496 if (ap->a_accmode & VDELETE) 497 mode |= NFSACCESS_DELETE; 498 } else { 499 if (ap->a_accmode & VWRITE) 500 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 501 if (ap->a_accmode & VAPPEND) 502 mode |= NFSACCESS_EXTEND; 503 if (ap->a_accmode & VEXEC) 504 mode |= NFSACCESS_LOOKUP; 505 if (ap->a_accmode & VDELETE) 506 mode |= NFSACCESS_DELETE; 507 if (ap->a_accmode & VDELETE_CHILD) 508 mode |= NFSACCESS_MODIFY; 509 } 510 /* XXX safety belt, only make blanket request if caching */ 511 if (nfsaccess_cache_timeout > 0) { 512 wmode = NFSACCESS_READ | NFSACCESS_MODIFY | 513 NFSACCESS_EXTEND | NFSACCESS_EXECUTE | 514 NFSACCESS_DELETE | NFSACCESS_LOOKUP; 515 } else { 516 wmode = mode; 517 } 518 519 /* 520 * Does our cached result allow us to give a definite yes to 521 * this request? 522 */ 523 gotahit = 0; 524 NFSLOCKNODE(np); 525 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 526 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) { 527 if (time_second < (np->n_accesscache[i].stamp 528 + nfsaccess_cache_timeout) && 529 (np->n_accesscache[i].mode & mode) == mode) { 530 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits); 531 gotahit = 1; 532 } 533 break; 534 } 535 } 536 NFSUNLOCKNODE(np); 537 #ifdef KDTRACE_HOOKS 538 if (gotahit != 0) 539 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp, 540 ap->a_cred->cr_uid, mode); 541 else 542 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp, 543 ap->a_cred->cr_uid, mode); 544 #endif 545 if (gotahit == 0) { 546 /* 547 * Either a no, or a don't know. Go to the wire. 548 */ 549 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 550 error = nfs34_access_otw(vp, wmode, ap->a_td, 551 ap->a_cred, &rmode); 552 if (!error && 553 (rmode & mode) != mode) 554 error = EACCES; 555 } 556 return (error); 557 } else { 558 if ((error = nfsspec_access(ap)) != 0) { 559 return (error); 560 } 561 /* 562 * Attempt to prevent a mapped root from accessing a file 563 * which it shouldn't. We try to read a byte from the file 564 * if the user is root and the file is not zero length. 565 * After calling nfsspec_access, we should have the correct 566 * file size cached. 567 */ 568 NFSLOCKNODE(np); 569 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD) 570 && VTONFS(vp)->n_size > 0) { 571 struct iovec aiov; 572 struct uio auio; 573 char buf[1]; 574 575 NFSUNLOCKNODE(np); 576 aiov.iov_base = buf; 577 aiov.iov_len = 1; 578 auio.uio_iov = &aiov; 579 auio.uio_iovcnt = 1; 580 auio.uio_offset = 0; 581 auio.uio_resid = 1; 582 auio.uio_segflg = UIO_SYSSPACE; 583 auio.uio_rw = UIO_READ; 584 auio.uio_td = ap->a_td; 585 586 if (vp->v_type == VREG) 587 error = ncl_readrpc(vp, &auio, ap->a_cred); 588 else if (vp->v_type == VDIR) { 589 char* bp; 590 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 591 aiov.iov_base = bp; 592 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 593 error = ncl_readdirrpc(vp, &auio, ap->a_cred, 594 ap->a_td); 595 free(bp, M_TEMP); 596 } else if (vp->v_type == VLNK) 597 error = ncl_readlinkrpc(vp, &auio, ap->a_cred); 598 else 599 error = EACCES; 600 } else 601 NFSUNLOCKNODE(np); 602 return (error); 603 } 604 } 605 606 /* 607 * nfs open vnode op 608 * Check to see if the type is ok 609 * and that deletion is not in progress. 610 * For paged in text files, you will need to flush the page cache 611 * if consistency is lost. 612 */ 613 /* ARGSUSED */ 614 static int 615 nfs_open(struct vop_open_args *ap) 616 { 617 struct vnode *vp = ap->a_vp; 618 struct nfsnode *np = VTONFS(vp); 619 struct vattr vattr; 620 int error; 621 int fmode = ap->a_mode; 622 struct ucred *cred; 623 vm_object_t obj; 624 625 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 626 return (EOPNOTSUPP); 627 628 /* 629 * For NFSv4, we need to do the Open Op before cache validation, 630 * so that we conform to RFC3530 Sec. 9.3.1. 631 */ 632 if (NFS_ISV4(vp)) { 633 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td); 634 if (error) { 635 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 636 (gid_t)0); 637 return (error); 638 } 639 } 640 641 /* 642 * Now, if this Open will be doing reading, re-validate/flush the 643 * cache, so that Close/Open coherency is maintained. 644 */ 645 NFSLOCKNODE(np); 646 if (np->n_flag & NMODIFIED) { 647 NFSUNLOCKNODE(np); 648 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 649 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 650 if (VN_IS_DOOMED(vp)) 651 return (EBADF); 652 } 653 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 654 if (error == EINTR || error == EIO) { 655 if (NFS_ISV4(vp)) 656 (void) nfsrpc_close(vp, 0, ap->a_td); 657 return (error); 658 } 659 NFSLOCKNODE(np); 660 np->n_attrstamp = 0; 661 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 662 if (vp->v_type == VDIR) 663 np->n_direofoffset = 0; 664 NFSUNLOCKNODE(np); 665 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 666 if (error) { 667 if (NFS_ISV4(vp)) 668 (void) nfsrpc_close(vp, 0, ap->a_td); 669 return (error); 670 } 671 NFSLOCKNODE(np); 672 np->n_mtime = vattr.va_mtime; 673 if (NFS_ISV4(vp)) 674 np->n_change = vattr.va_filerev; 675 } else { 676 NFSUNLOCKNODE(np); 677 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 678 if (error) { 679 if (NFS_ISV4(vp)) 680 (void) nfsrpc_close(vp, 0, ap->a_td); 681 return (error); 682 } 683 NFSLOCKNODE(np); 684 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) || 685 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 686 if (vp->v_type == VDIR) 687 np->n_direofoffset = 0; 688 NFSUNLOCKNODE(np); 689 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 690 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 691 if (VN_IS_DOOMED(vp)) 692 return (EBADF); 693 } 694 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 695 if (error == EINTR || error == EIO) { 696 if (NFS_ISV4(vp)) 697 (void) nfsrpc_close(vp, 0, ap->a_td); 698 return (error); 699 } 700 NFSLOCKNODE(np); 701 np->n_mtime = vattr.va_mtime; 702 if (NFS_ISV4(vp)) 703 np->n_change = vattr.va_filerev; 704 } 705 } 706 707 /* 708 * If the object has >= 1 O_DIRECT active opens, we disable caching. 709 */ 710 if (newnfs_directio_enable && (fmode & O_DIRECT) && 711 (vp->v_type == VREG)) { 712 if (np->n_directio_opens == 0) { 713 NFSUNLOCKNODE(np); 714 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 715 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 716 if (VN_IS_DOOMED(vp)) 717 return (EBADF); 718 } 719 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 720 if (error) { 721 if (NFS_ISV4(vp)) 722 (void) nfsrpc_close(vp, 0, ap->a_td); 723 return (error); 724 } 725 NFSLOCKNODE(np); 726 np->n_flag |= NNONCACHE; 727 } 728 np->n_directio_opens++; 729 } 730 731 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */ 732 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0) 733 np->n_flag |= NWRITEOPENED; 734 735 /* 736 * If this is an open for writing, capture a reference to the 737 * credentials, so they can be used by ncl_putpages(). Using 738 * these write credentials is preferable to the credentials of 739 * whatever thread happens to be doing the VOP_PUTPAGES() since 740 * the write RPCs are less likely to fail with EACCES. 741 */ 742 if ((fmode & FWRITE) != 0) { 743 cred = np->n_writecred; 744 np->n_writecred = crhold(ap->a_cred); 745 } else 746 cred = NULL; 747 NFSUNLOCKNODE(np); 748 749 if (cred != NULL) 750 crfree(cred); 751 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 752 753 /* 754 * If the text file has been mmap'd, flush any dirty pages to the 755 * buffer cache and then... 756 * Make sure all writes are pushed to the NFS server. If this is not 757 * done, the modify time of the file can change while the text 758 * file is being executed. This will cause the process that is 759 * executing the text file to be terminated. 760 */ 761 if (vp->v_writecount <= -1) { 762 if ((obj = vp->v_object) != NULL && 763 vm_object_mightbedirty(obj)) { 764 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 765 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 766 if (VN_IS_DOOMED(vp)) 767 return (EBADF); 768 } 769 VM_OBJECT_WLOCK(obj); 770 vm_object_page_clean(obj, 0, 0, OBJPC_SYNC); 771 VM_OBJECT_WUNLOCK(obj); 772 } 773 774 /* Now, flush the buffer cache. */ 775 ncl_flush(vp, MNT_WAIT, curthread, 0, 0); 776 777 /* And, finally, make sure that n_mtime is up to date. */ 778 np = VTONFS(vp); 779 NFSLOCKNODE(np); 780 np->n_mtime = np->n_vattr.na_mtime; 781 NFSUNLOCKNODE(np); 782 } 783 return (0); 784 } 785 786 /* 787 * nfs close vnode op 788 * What an NFS client should do upon close after writing is a debatable issue. 789 * Most NFS clients push delayed writes to the server upon close, basically for 790 * two reasons: 791 * 1 - So that any write errors may be reported back to the client process 792 * doing the close system call. By far the two most likely errors are 793 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 794 * 2 - To put a worst case upper bound on cache inconsistency between 795 * multiple clients for the file. 796 * There is also a consistency problem for Version 2 of the protocol w.r.t. 797 * not being able to tell if other clients are writing a file concurrently, 798 * since there is no way of knowing if the changed modify time in the reply 799 * is only due to the write for this client. 800 * (NFS Version 3 provides weak cache consistency data in the reply that 801 * should be sufficient to detect and handle this case.) 802 * 803 * The current code does the following: 804 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 805 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 806 * or commit them (this satisfies 1 and 2 except for the 807 * case where the server crashes after this close but 808 * before the commit RPC, which is felt to be "good 809 * enough". Changing the last argument to ncl_flush() to 810 * a 1 would force a commit operation, if it is felt a 811 * commit is necessary now. 812 * for NFS Version 4 - flush the dirty buffers and commit them, if 813 * nfscl_mustflush() says this is necessary. 814 * It is necessary if there is no write delegation held, 815 * in order to satisfy open/close coherency. 816 * If the file isn't cached on local stable storage, 817 * it may be necessary in order to detect "out of space" 818 * errors from the server, if the write delegation 819 * issued by the server doesn't allow the file to grow. 820 */ 821 /* ARGSUSED */ 822 static int 823 nfs_close(struct vop_close_args *ap) 824 { 825 struct vnode *vp = ap->a_vp; 826 struct nfsnode *np = VTONFS(vp); 827 struct nfsvattr nfsva; 828 struct ucred *cred; 829 int error = 0, ret, localcred = 0; 830 int fmode = ap->a_fflag; 831 832 if (NFSCL_FORCEDISM(vp->v_mount)) 833 return (0); 834 /* 835 * During shutdown, a_cred isn't valid, so just use root. 836 */ 837 if (ap->a_cred == NOCRED) { 838 cred = newnfs_getcred(); 839 localcred = 1; 840 } else { 841 cred = ap->a_cred; 842 } 843 if (vp->v_type == VREG) { 844 /* 845 * Examine and clean dirty pages, regardless of NMODIFIED. 846 * This closes a major hole in close-to-open consistency. 847 * We want to push out all dirty pages (and buffers) on 848 * close, regardless of whether they were dirtied by 849 * mmap'ed writes or via write(). 850 */ 851 if (nfs_clean_pages_on_close && vp->v_object) { 852 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 853 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 854 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK) 855 return (EBADF); 856 } 857 VM_OBJECT_WLOCK(vp->v_object); 858 vm_object_page_clean(vp->v_object, 0, 0, 0); 859 VM_OBJECT_WUNLOCK(vp->v_object); 860 } 861 NFSLOCKNODE(np); 862 if (np->n_flag & NMODIFIED) { 863 NFSUNLOCKNODE(np); 864 if (NFS_ISV3(vp)) { 865 /* 866 * Under NFSv3 we have dirty buffers to dispose of. We 867 * must flush them to the NFS server. We have the option 868 * of waiting all the way through the commit rpc or just 869 * waiting for the initial write. The default is to only 870 * wait through the initial write so the data is in the 871 * server's cache, which is roughly similar to the state 872 * a standard disk subsystem leaves the file in on close(). 873 * 874 * We cannot clear the NMODIFIED bit in np->n_flag due to 875 * potential races with other processes, and certainly 876 * cannot clear it if we don't commit. 877 * These races occur when there is no longer the old 878 * traditional vnode locking implemented for Vnode Ops. 879 */ 880 int cm = newnfs_commit_on_close ? 1 : 0; 881 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 882 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 883 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK) 884 return (EBADF); 885 } 886 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0); 887 /* np->n_flag &= ~NMODIFIED; */ 888 } else if (NFS_ISV4(vp)) { 889 if (nfscl_mustflush(vp) != 0) { 890 int cm = newnfs_commit_on_close ? 1 : 0; 891 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 892 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 893 if (VN_IS_DOOMED(vp) && ap->a_fflag != 894 FNONBLOCK) 895 return (EBADF); 896 } 897 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 898 cm, 0); 899 /* 900 * as above w.r.t races when clearing 901 * NMODIFIED. 902 * np->n_flag &= ~NMODIFIED; 903 */ 904 } 905 } else { 906 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 907 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 908 if (VN_IS_DOOMED(vp) && ap->a_fflag != 909 FNONBLOCK) 910 return (EBADF); 911 } 912 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 913 } 914 NFSLOCKNODE(np); 915 } 916 /* 917 * Invalidate the attribute cache in all cases. 918 * An open is going to fetch fresh attrs any way, other procs 919 * on this node that have file open will be forced to do an 920 * otw attr fetch, but this is safe. 921 * --> A user found that their RPC count dropped by 20% when 922 * this was commented out and I can't see any requirement 923 * for it, so I've disabled it when negative lookups are 924 * enabled. (What does this have to do with negative lookup 925 * caching? Well nothing, except it was reported by the 926 * same user that needed negative lookup caching and I wanted 927 * there to be a way to disable it to see if it 928 * is the cause of some caching/coherency issue that might 929 * crop up.) 930 */ 931 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) { 932 np->n_attrstamp = 0; 933 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 934 } 935 if (np->n_flag & NWRITEERR) { 936 np->n_flag &= ~NWRITEERR; 937 error = np->n_error; 938 } 939 NFSUNLOCKNODE(np); 940 } 941 942 if (NFS_ISV4(vp)) { 943 /* 944 * Get attributes so "change" is up to date. 945 */ 946 if (error == 0 && nfscl_mustflush(vp) != 0 && 947 vp->v_type == VREG && 948 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) { 949 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva, 950 NULL); 951 if (!ret) { 952 np->n_change = nfsva.na_filerev; 953 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 954 NULL, 0, 0); 955 } 956 } 957 958 /* 959 * and do the close. 960 */ 961 ret = nfsrpc_close(vp, 0, ap->a_td); 962 if (!error && ret) 963 error = ret; 964 if (error) 965 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 966 (gid_t)0); 967 } 968 if (newnfs_directio_enable) 969 KASSERT((np->n_directio_asyncwr == 0), 970 ("nfs_close: dirty unflushed (%d) directio buffers\n", 971 np->n_directio_asyncwr)); 972 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 973 NFSLOCKNODE(np); 974 KASSERT((np->n_directio_opens > 0), 975 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 976 np->n_directio_opens--; 977 if (np->n_directio_opens == 0) 978 np->n_flag &= ~NNONCACHE; 979 NFSUNLOCKNODE(np); 980 } 981 if (localcred) 982 NFSFREECRED(cred); 983 return (error); 984 } 985 986 /* 987 * nfs getattr call from vfs. 988 */ 989 static int 990 nfs_getattr(struct vop_getattr_args *ap) 991 { 992 struct vnode *vp = ap->a_vp; 993 struct thread *td = curthread; /* XXX */ 994 struct nfsnode *np = VTONFS(vp); 995 int error = 0; 996 struct nfsvattr nfsva; 997 struct vattr *vap = ap->a_vap; 998 struct vattr vattr; 999 1000 /* 1001 * Update local times for special files. 1002 */ 1003 NFSLOCKNODE(np); 1004 if (np->n_flag & (NACC | NUPD)) 1005 np->n_flag |= NCHG; 1006 NFSUNLOCKNODE(np); 1007 /* 1008 * First look in the cache. 1009 */ 1010 if (ncl_getattrcache(vp, &vattr) == 0) { 1011 ncl_copy_vattr(vap, &vattr); 1012 1013 /* 1014 * Get the local modify time for the case of a write 1015 * delegation. 1016 */ 1017 nfscl_deleggetmodtime(vp, &vap->va_mtime); 1018 return (0); 1019 } 1020 1021 if (NFS_ISV34(vp) && nfs_prime_access_cache && 1022 nfsaccess_cache_timeout > 0) { 1023 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 1024 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL); 1025 if (ncl_getattrcache(vp, ap->a_vap) == 0) { 1026 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime); 1027 return (0); 1028 } 1029 } 1030 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL); 1031 if (!error) 1032 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0); 1033 if (!error) { 1034 /* 1035 * Get the local modify time for the case of a write 1036 * delegation. 1037 */ 1038 nfscl_deleggetmodtime(vp, &vap->va_mtime); 1039 } else if (NFS_ISV4(vp)) { 1040 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1041 } 1042 return (error); 1043 } 1044 1045 /* 1046 * nfs setattr call. 1047 */ 1048 static int 1049 nfs_setattr(struct vop_setattr_args *ap) 1050 { 1051 struct vnode *vp = ap->a_vp; 1052 struct nfsnode *np = VTONFS(vp); 1053 struct thread *td = curthread; /* XXX */ 1054 struct vattr *vap = ap->a_vap; 1055 int error = 0; 1056 u_quad_t tsize; 1057 struct timespec ts; 1058 1059 #ifndef nolint 1060 tsize = (u_quad_t)0; 1061 #endif 1062 1063 /* 1064 * Setting of flags and marking of atimes are not supported. 1065 */ 1066 if (vap->va_flags != VNOVAL) 1067 return (EOPNOTSUPP); 1068 1069 /* 1070 * Disallow write attempts if the filesystem is mounted read-only. 1071 */ 1072 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 1073 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 1074 vap->va_mtime.tv_sec != VNOVAL || 1075 vap->va_birthtime.tv_sec != VNOVAL || 1076 vap->va_mode != (mode_t)VNOVAL) && 1077 (vp->v_mount->mnt_flag & MNT_RDONLY)) 1078 return (EROFS); 1079 if (vap->va_size != VNOVAL) { 1080 switch (vp->v_type) { 1081 case VDIR: 1082 return (EISDIR); 1083 case VCHR: 1084 case VBLK: 1085 case VSOCK: 1086 case VFIFO: 1087 if (vap->va_mtime.tv_sec == VNOVAL && 1088 vap->va_atime.tv_sec == VNOVAL && 1089 vap->va_birthtime.tv_sec == VNOVAL && 1090 vap->va_mode == (mode_t)VNOVAL && 1091 vap->va_uid == (uid_t)VNOVAL && 1092 vap->va_gid == (gid_t)VNOVAL) 1093 return (0); 1094 vap->va_size = VNOVAL; 1095 break; 1096 default: 1097 /* 1098 * Disallow write attempts if the filesystem is 1099 * mounted read-only. 1100 */ 1101 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1102 return (EROFS); 1103 /* 1104 * We run vnode_pager_setsize() early (why?), 1105 * we must set np->n_size now to avoid vinvalbuf 1106 * V_SAVE races that might setsize a lower 1107 * value. 1108 */ 1109 NFSLOCKNODE(np); 1110 tsize = np->n_size; 1111 NFSUNLOCKNODE(np); 1112 error = ncl_meta_setsize(vp, td, vap->va_size); 1113 NFSLOCKNODE(np); 1114 if (np->n_flag & NMODIFIED) { 1115 tsize = np->n_size; 1116 NFSUNLOCKNODE(np); 1117 error = ncl_vinvalbuf(vp, vap->va_size == 0 ? 1118 0 : V_SAVE, td, 1); 1119 if (error != 0) { 1120 vnode_pager_setsize(vp, tsize); 1121 return (error); 1122 } 1123 /* 1124 * Call nfscl_delegmodtime() to set the modify time 1125 * locally, as required. 1126 */ 1127 nfscl_delegmodtime(vp); 1128 } else 1129 NFSUNLOCKNODE(np); 1130 /* 1131 * np->n_size has already been set to vap->va_size 1132 * in ncl_meta_setsize(). We must set it again since 1133 * nfs_loadattrcache() could be called through 1134 * ncl_meta_setsize() and could modify np->n_size. 1135 */ 1136 NFSLOCKNODE(np); 1137 np->n_vattr.na_size = np->n_size = vap->va_size; 1138 NFSUNLOCKNODE(np); 1139 } 1140 } else { 1141 NFSLOCKNODE(np); 1142 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 1143 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 1144 NFSUNLOCKNODE(np); 1145 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 1146 if (error == EINTR || error == EIO) 1147 return (error); 1148 } else 1149 NFSUNLOCKNODE(np); 1150 } 1151 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 1152 if (vap->va_size != VNOVAL) { 1153 if (error == 0) { 1154 nanouptime(&ts); 1155 NFSLOCKNODE(np); 1156 np->n_localmodtime = ts; 1157 NFSUNLOCKNODE(np); 1158 } else { 1159 NFSLOCKNODE(np); 1160 np->n_size = np->n_vattr.na_size = tsize; 1161 vnode_pager_setsize(vp, tsize); 1162 NFSUNLOCKNODE(np); 1163 } 1164 } 1165 return (error); 1166 } 1167 1168 /* 1169 * Do an nfs setattr rpc. 1170 */ 1171 static int 1172 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 1173 struct thread *td) 1174 { 1175 struct nfsnode *np = VTONFS(vp); 1176 int error, ret, attrflag, i; 1177 struct nfsvattr nfsva; 1178 1179 if (NFS_ISV34(vp)) { 1180 NFSLOCKNODE(np); 1181 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) 1182 np->n_accesscache[i].stamp = 0; 1183 np->n_flag |= NDELEGMOD; 1184 NFSUNLOCKNODE(np); 1185 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); 1186 } 1187 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag, 1188 NULL); 1189 if (attrflag) { 1190 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 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 = cnp->cn_thread; 1217 struct nfsfh *nfhp; 1218 struct nfsvattr dnfsva, nfsva; 1219 struct vattr vattr; 1220 struct timespec nctime, ts; 1221 1222 *vpp = NULLVP; 1223 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) && 1224 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 1225 return (EROFS); 1226 if (dvp->v_type != VDIR) 1227 return (ENOTDIR); 1228 nmp = VFSTONFS(mp); 1229 np = VTONFS(dvp); 1230 1231 /* For NFSv4, wait until any remove is done. */ 1232 NFSLOCKNODE(np); 1233 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) { 1234 np->n_flag |= NREMOVEWANT; 1235 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0); 1236 } 1237 NFSUNLOCKNODE(np); 1238 1239 error = vn_dir_check_exec(dvp, cnp); 1240 if (error != 0) 1241 return (error); 1242 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks); 1243 if (error > 0 && error != ENOENT) 1244 return (error); 1245 if (error == -1) { 1246 /* 1247 * Lookups of "." are special and always return the 1248 * current directory. cache_lookup() already handles 1249 * associated locking bookkeeping, etc. 1250 */ 1251 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 1252 /* XXX: Is this really correct? */ 1253 if (cnp->cn_nameiop != LOOKUP && 1254 (flags & ISLASTCN)) 1255 cnp->cn_flags |= SAVENAME; 1256 return (0); 1257 } 1258 1259 /* 1260 * We only accept a positive hit in the cache if the 1261 * change time of the file matches our cached copy. 1262 * Otherwise, we discard the cache entry and fallback 1263 * to doing a lookup RPC. We also only trust cache 1264 * entries for less than nm_nametimeo seconds. 1265 * 1266 * To better handle stale file handles and attributes, 1267 * clear the attribute cache of this node if it is a 1268 * leaf component, part of an open() call, and not 1269 * locally modified before fetching the attributes. 1270 * This should allow stale file handles to be detected 1271 * here where we can fall back to a LOOKUP RPC to 1272 * recover rather than having nfs_open() detect the 1273 * stale file handle and failing open(2) with ESTALE. 1274 */ 1275 newvp = *vpp; 1276 newnp = VTONFS(newvp); 1277 if (!(nmp->nm_flag & NFSMNT_NOCTO) && 1278 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1279 !(newnp->n_flag & NMODIFIED)) { 1280 NFSLOCKNODE(newnp); 1281 newnp->n_attrstamp = 0; 1282 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1283 NFSUNLOCKNODE(newnp); 1284 } 1285 if (nfscl_nodeleg(newvp, 0) == 0 || 1286 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) && 1287 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 && 1288 timespeccmp(&vattr.va_ctime, &nctime, ==))) { 1289 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1290 if (cnp->cn_nameiop != LOOKUP && 1291 (flags & ISLASTCN)) 1292 cnp->cn_flags |= SAVENAME; 1293 return (0); 1294 } 1295 cache_purge(newvp); 1296 if (dvp != newvp) 1297 vput(newvp); 1298 else 1299 vrele(newvp); 1300 *vpp = NULLVP; 1301 } else if (error == ENOENT) { 1302 if (VN_IS_DOOMED(dvp)) 1303 return (ENOENT); 1304 /* 1305 * We only accept a negative hit in the cache if the 1306 * modification time of the parent directory matches 1307 * the cached copy in the name cache entry. 1308 * Otherwise, we discard all of the negative cache 1309 * entries for this directory. We also only trust 1310 * negative cache entries for up to nm_negnametimeo 1311 * seconds. 1312 */ 1313 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) && 1314 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && 1315 timespeccmp(&vattr.va_mtime, &nctime, ==)) { 1316 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1317 return (ENOENT); 1318 } 1319 cache_purge_negative(dvp); 1320 } 1321 1322 newvp = NULLVP; 1323 NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses); 1324 nanouptime(&ts); 1325 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1326 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1327 NULL); 1328 if (dattrflag) 1329 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1330 if (error) { 1331 if (newvp != NULLVP) { 1332 vput(newvp); 1333 *vpp = NULLVP; 1334 } 1335 1336 if (error != ENOENT) { 1337 if (NFS_ISV4(dvp)) 1338 error = nfscl_maperr(td, error, (uid_t)0, 1339 (gid_t)0); 1340 return (error); 1341 } 1342 1343 /* The requested file was not found. */ 1344 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1345 (flags & ISLASTCN)) { 1346 /* 1347 * XXX: UFS does a full VOP_ACCESS(dvp, 1348 * VWRITE) here instead of just checking 1349 * MNT_RDONLY. 1350 */ 1351 if (mp->mnt_flag & MNT_RDONLY) 1352 return (EROFS); 1353 cnp->cn_flags |= SAVENAME; 1354 return (EJUSTRETURN); 1355 } 1356 1357 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) { 1358 /* 1359 * Cache the modification time of the parent 1360 * directory from the post-op attributes in 1361 * the name cache entry. The negative cache 1362 * entry will be ignored once the directory 1363 * has changed. Don't bother adding the entry 1364 * if the directory has already changed. 1365 */ 1366 NFSLOCKNODE(np); 1367 if (timespeccmp(&np->n_vattr.na_mtime, 1368 &dnfsva.na_mtime, ==)) { 1369 NFSUNLOCKNODE(np); 1370 cache_enter_time(dvp, NULL, cnp, 1371 &dnfsva.na_mtime, NULL); 1372 } else 1373 NFSUNLOCKNODE(np); 1374 } 1375 return (ENOENT); 1376 } 1377 1378 /* 1379 * Handle RENAME case... 1380 */ 1381 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 1382 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1383 free(nfhp, M_NFSFH); 1384 return (EISDIR); 1385 } 1386 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1387 LK_EXCLUSIVE); 1388 if (error) 1389 return (error); 1390 newvp = NFSTOV(np); 1391 /* 1392 * If n_localmodtime >= time before RPC, then 1393 * a file modification operation, such as 1394 * VOP_SETATTR() of size, has occurred while 1395 * the Lookup RPC and acquisition of the vnode 1396 * happened. As such, the attributes might 1397 * be stale, with possibly an incorrect size. 1398 */ 1399 NFSLOCKNODE(np); 1400 if (timespecisset(&np->n_localmodtime) && 1401 timespeccmp(&np->n_localmodtime, &ts, >=)) { 1402 NFSCL_DEBUG(4, "nfs_lookup: rename localmod " 1403 "stale attributes\n"); 1404 attrflag = 0; 1405 } 1406 NFSUNLOCKNODE(np); 1407 if (attrflag) 1408 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1409 0, 1); 1410 *vpp = newvp; 1411 cnp->cn_flags |= SAVENAME; 1412 return (0); 1413 } 1414 1415 if (flags & ISDOTDOT) { 1416 ltype = NFSVOPISLOCKED(dvp); 1417 error = vfs_busy(mp, MBF_NOWAIT); 1418 if (error != 0) { 1419 vfs_ref(mp); 1420 NFSVOPUNLOCK(dvp); 1421 error = vfs_busy(mp, 0); 1422 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1423 vfs_rel(mp); 1424 if (error == 0 && VN_IS_DOOMED(dvp)) { 1425 vfs_unbusy(mp); 1426 error = ENOENT; 1427 } 1428 if (error != 0) 1429 return (error); 1430 } 1431 NFSVOPUNLOCK(dvp); 1432 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1433 cnp->cn_lkflags); 1434 if (error == 0) 1435 newvp = NFSTOV(np); 1436 vfs_unbusy(mp); 1437 if (newvp != dvp) 1438 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1439 if (VN_IS_DOOMED(dvp)) { 1440 if (error == 0) { 1441 if (newvp == dvp) 1442 vrele(newvp); 1443 else 1444 vput(newvp); 1445 } 1446 error = ENOENT; 1447 } 1448 if (error != 0) 1449 return (error); 1450 if (attrflag) 1451 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1452 0, 1); 1453 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1454 free(nfhp, M_NFSFH); 1455 VREF(dvp); 1456 newvp = dvp; 1457 if (attrflag) 1458 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1459 0, 1); 1460 } else { 1461 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1462 cnp->cn_lkflags); 1463 if (error) 1464 return (error); 1465 newvp = NFSTOV(np); 1466 /* 1467 * If n_localmodtime >= time before RPC, then 1468 * a file modification operation, such as 1469 * VOP_SETATTR() of size, has occurred while 1470 * the Lookup RPC and acquisition of the vnode 1471 * happened. As such, the attributes might 1472 * be stale, with possibly an incorrect size. 1473 */ 1474 NFSLOCKNODE(np); 1475 if (timespecisset(&np->n_localmodtime) && 1476 timespeccmp(&np->n_localmodtime, &ts, >=)) { 1477 NFSCL_DEBUG(4, "nfs_lookup: localmod " 1478 "stale attributes\n"); 1479 attrflag = 0; 1480 } 1481 NFSUNLOCKNODE(np); 1482 if (attrflag) 1483 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1484 0, 1); 1485 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1486 !(np->n_flag & NMODIFIED)) { 1487 /* 1488 * Flush the attribute cache when opening a 1489 * leaf node to ensure that fresh attributes 1490 * are fetched in nfs_open() since we did not 1491 * fetch attributes from the LOOKUP reply. 1492 */ 1493 NFSLOCKNODE(np); 1494 np->n_attrstamp = 0; 1495 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1496 NFSUNLOCKNODE(np); 1497 } 1498 } 1499 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1500 cnp->cn_flags |= SAVENAME; 1501 if ((cnp->cn_flags & MAKEENTRY) && dvp != newvp && 1502 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) && 1503 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0)) 1504 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 1505 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime); 1506 *vpp = newvp; 1507 return (0); 1508 } 1509 1510 /* 1511 * nfs read call. 1512 * Just call ncl_bioread() to do the work. 1513 */ 1514 static int 1515 nfs_read(struct vop_read_args *ap) 1516 { 1517 struct vnode *vp = ap->a_vp; 1518 1519 switch (vp->v_type) { 1520 case VREG: 1521 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1522 case VDIR: 1523 return (EISDIR); 1524 default: 1525 return (EOPNOTSUPP); 1526 } 1527 } 1528 1529 /* 1530 * nfs readlink call 1531 */ 1532 static int 1533 nfs_readlink(struct vop_readlink_args *ap) 1534 { 1535 struct vnode *vp = ap->a_vp; 1536 1537 if (vp->v_type != VLNK) 1538 return (EINVAL); 1539 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1540 } 1541 1542 /* 1543 * Do a readlink rpc. 1544 * Called by ncl_doio() from below the buffer cache. 1545 */ 1546 int 1547 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1548 { 1549 int error, ret, attrflag; 1550 struct nfsvattr nfsva; 1551 1552 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva, 1553 &attrflag, NULL); 1554 if (attrflag) { 1555 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1556 if (ret && !error) 1557 error = ret; 1558 } 1559 if (error && NFS_ISV4(vp)) 1560 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1561 return (error); 1562 } 1563 1564 /* 1565 * nfs read rpc call 1566 * Ditto above 1567 */ 1568 int 1569 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1570 { 1571 int error, ret, attrflag; 1572 struct nfsvattr nfsva; 1573 struct nfsmount *nmp; 1574 1575 nmp = VFSTONFS(vp->v_mount); 1576 error = EIO; 1577 attrflag = 0; 1578 if (NFSHASPNFS(nmp)) 1579 error = nfscl_doiods(vp, uiop, NULL, NULL, 1580 NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td); 1581 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error); 1582 if (error != 0) 1583 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, 1584 &attrflag, NULL); 1585 if (attrflag) { 1586 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1587 if (ret && !error) 1588 error = ret; 1589 } 1590 if (error && NFS_ISV4(vp)) 1591 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1592 return (error); 1593 } 1594 1595 /* 1596 * nfs write call 1597 */ 1598 int 1599 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1600 int *iomode, int *must_commit, int called_from_strategy, int ioflag) 1601 { 1602 struct nfsvattr nfsva; 1603 int error, attrflag, ret; 1604 struct nfsmount *nmp; 1605 1606 nmp = VFSTONFS(vp->v_mount); 1607 error = EIO; 1608 attrflag = 0; 1609 if (NFSHASPNFS(nmp)) 1610 error = nfscl_doiods(vp, uiop, iomode, must_commit, 1611 NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td); 1612 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error); 1613 if (error != 0) 1614 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred, 1615 uiop->uio_td, &nfsva, &attrflag, called_from_strategy, 1616 ioflag); 1617 if (attrflag) { 1618 if (VTONFS(vp)->n_flag & ND_NFSV4) 1619 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1, 1620 1); 1621 else 1622 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1623 1); 1624 if (ret && !error) 1625 error = ret; 1626 } 1627 if (DOINGASYNC(vp)) 1628 *iomode = NFSWRITE_FILESYNC; 1629 if (error && NFS_ISV4(vp)) 1630 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1631 return (error); 1632 } 1633 1634 /* 1635 * nfs mknod rpc 1636 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1637 * mode set to specify the file type and the size field for rdev. 1638 */ 1639 static int 1640 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1641 struct vattr *vap) 1642 { 1643 struct nfsvattr nfsva, dnfsva; 1644 struct vnode *newvp = NULL; 1645 struct nfsnode *np = NULL, *dnp; 1646 struct nfsfh *nfhp; 1647 struct vattr vattr; 1648 int error = 0, attrflag, dattrflag; 1649 u_int32_t rdev; 1650 1651 if (vap->va_type == VCHR || vap->va_type == VBLK) 1652 rdev = vap->va_rdev; 1653 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1654 rdev = 0xffffffff; 1655 else 1656 return (EOPNOTSUPP); 1657 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1658 return (error); 1659 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap, 1660 rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva, 1661 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 1662 if (!error) { 1663 if (!nfhp) 1664 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1665 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, 1666 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1667 NULL); 1668 if (nfhp) 1669 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1670 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE); 1671 } 1672 if (dattrflag) 1673 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1674 if (!error) { 1675 newvp = NFSTOV(np); 1676 if (attrflag != 0) { 1677 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1678 0, 1); 1679 if (error != 0) 1680 vput(newvp); 1681 } 1682 } 1683 if (!error) { 1684 *vpp = newvp; 1685 } else if (NFS_ISV4(dvp)) { 1686 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid, 1687 vap->va_gid); 1688 } 1689 dnp = VTONFS(dvp); 1690 NFSLOCKNODE(dnp); 1691 dnp->n_flag |= NMODIFIED; 1692 if (!dattrflag) { 1693 dnp->n_attrstamp = 0; 1694 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1695 } 1696 NFSUNLOCKNODE(dnp); 1697 return (error); 1698 } 1699 1700 /* 1701 * nfs mknod vop 1702 * just call nfs_mknodrpc() to do the work. 1703 */ 1704 /* ARGSUSED */ 1705 static int 1706 nfs_mknod(struct vop_mknod_args *ap) 1707 { 1708 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1709 } 1710 1711 static struct mtx nfs_cverf_mtx; 1712 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex", 1713 MTX_DEF); 1714 1715 static nfsquad_t 1716 nfs_get_cverf(void) 1717 { 1718 static nfsquad_t cverf; 1719 nfsquad_t ret; 1720 static int cverf_initialized = 0; 1721 1722 mtx_lock(&nfs_cverf_mtx); 1723 if (cverf_initialized == 0) { 1724 cverf.lval[0] = arc4random(); 1725 cverf.lval[1] = arc4random(); 1726 cverf_initialized = 1; 1727 } else 1728 cverf.qval++; 1729 ret = cverf; 1730 mtx_unlock(&nfs_cverf_mtx); 1731 1732 return (ret); 1733 } 1734 1735 /* 1736 * nfs file create call 1737 */ 1738 static int 1739 nfs_create(struct vop_create_args *ap) 1740 { 1741 struct vnode *dvp = ap->a_dvp; 1742 struct vattr *vap = ap->a_vap; 1743 struct componentname *cnp = ap->a_cnp; 1744 struct nfsnode *np = NULL, *dnp; 1745 struct vnode *newvp = NULL; 1746 struct nfsmount *nmp; 1747 struct nfsvattr dnfsva, nfsva; 1748 struct nfsfh *nfhp; 1749 nfsquad_t cverf; 1750 int error = 0, attrflag, dattrflag, fmode = 0; 1751 struct vattr vattr; 1752 1753 /* 1754 * Oops, not for me.. 1755 */ 1756 if (vap->va_type == VSOCK) 1757 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1758 1759 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1760 return (error); 1761 if (vap->va_vaflags & VA_EXCLUSIVE) 1762 fmode |= O_EXCL; 1763 dnp = VTONFS(dvp); 1764 nmp = VFSTONFS(dvp->v_mount); 1765 again: 1766 /* For NFSv4, wait until any remove is done. */ 1767 NFSLOCKNODE(dnp); 1768 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) { 1769 dnp->n_flag |= NREMOVEWANT; 1770 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0); 1771 } 1772 NFSUNLOCKNODE(dnp); 1773 1774 cverf = nfs_get_cverf(); 1775 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1776 vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, 1777 &nfhp, &attrflag, &dattrflag, NULL); 1778 if (!error) { 1779 if (nfhp == NULL) 1780 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1781 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, 1782 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1783 NULL); 1784 if (nfhp != NULL) 1785 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1786 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE); 1787 } 1788 if (dattrflag) 1789 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1790 if (!error) { 1791 newvp = NFSTOV(np); 1792 if (attrflag == 0) 1793 error = nfsrpc_getattr(newvp, cnp->cn_cred, 1794 cnp->cn_thread, &nfsva, NULL); 1795 if (error == 0) 1796 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1797 0, 1); 1798 } 1799 if (error) { 1800 if (newvp != NULL) { 1801 vput(newvp); 1802 newvp = NULL; 1803 } 1804 if (NFS_ISV34(dvp) && (fmode & O_EXCL) && 1805 error == NFSERR_NOTSUPP) { 1806 fmode &= ~O_EXCL; 1807 goto again; 1808 } 1809 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) { 1810 if (nfscl_checksattr(vap, &nfsva)) { 1811 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred, 1812 cnp->cn_thread, &nfsva, &attrflag, NULL); 1813 if (error && (vap->va_uid != (uid_t)VNOVAL || 1814 vap->va_gid != (gid_t)VNOVAL)) { 1815 /* try again without setting uid/gid */ 1816 vap->va_uid = (uid_t)VNOVAL; 1817 vap->va_gid = (uid_t)VNOVAL; 1818 error = nfsrpc_setattr(newvp, vap, NULL, 1819 cnp->cn_cred, cnp->cn_thread, &nfsva, 1820 &attrflag, NULL); 1821 } 1822 if (attrflag) 1823 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 1824 NULL, 0, 1); 1825 if (error != 0) 1826 vput(newvp); 1827 } 1828 } 1829 if (!error) { 1830 if ((cnp->cn_flags & MAKEENTRY) && attrflag) { 1831 if (dvp != newvp) 1832 cache_enter_time(dvp, newvp, cnp, 1833 &nfsva.na_ctime, NULL); 1834 else 1835 printf("nfs_create: bogus NFS server returned " 1836 "the directory as the new file object\n"); 1837 } 1838 *ap->a_vpp = newvp; 1839 } else if (NFS_ISV4(dvp)) { 1840 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid, 1841 vap->va_gid); 1842 } 1843 NFSLOCKNODE(dnp); 1844 dnp->n_flag |= NMODIFIED; 1845 if (!dattrflag) { 1846 dnp->n_attrstamp = 0; 1847 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1848 } 1849 NFSUNLOCKNODE(dnp); 1850 return (error); 1851 } 1852 1853 /* 1854 * nfs file remove call 1855 * To try and make nfs semantics closer to ufs semantics, a file that has 1856 * other processes using the vnode is renamed instead of removed and then 1857 * removed later on the last close. 1858 * - If v_usecount > 1 1859 * If a rename is not already in the works 1860 * call nfs_sillyrename() to set it up 1861 * else 1862 * do the remove rpc 1863 */ 1864 static int 1865 nfs_remove(struct vop_remove_args *ap) 1866 { 1867 struct vnode *vp = ap->a_vp; 1868 struct vnode *dvp = ap->a_dvp; 1869 struct componentname *cnp = ap->a_cnp; 1870 struct nfsnode *np = VTONFS(vp); 1871 int error = 0; 1872 struct vattr vattr; 1873 1874 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name")); 1875 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount")); 1876 if (vp->v_type == VDIR) 1877 error = EPERM; 1878 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1879 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1880 vattr.va_nlink > 1)) { 1881 /* 1882 * Purge the name cache so that the chance of a lookup for 1883 * the name succeeding while the remove is in progress is 1884 * minimized. Without node locking it can still happen, such 1885 * that an I/O op returns ESTALE, but since you get this if 1886 * another host removes the file.. 1887 */ 1888 cache_purge(vp); 1889 /* 1890 * throw away biocache buffers, mainly to avoid 1891 * unnecessary delayed writes later. 1892 */ 1893 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1); 1894 if (error != EINTR && error != EIO) 1895 /* Do the rpc */ 1896 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr, 1897 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1898 /* 1899 * Kludge City: If the first reply to the remove rpc is lost.. 1900 * the reply to the retransmitted request will be ENOENT 1901 * since the file was in fact removed 1902 * Therefore, we cheat and return success. 1903 */ 1904 if (error == ENOENT) 1905 error = 0; 1906 } else if (!np->n_sillyrename) 1907 error = nfs_sillyrename(dvp, vp, cnp); 1908 NFSLOCKNODE(np); 1909 np->n_attrstamp = 0; 1910 NFSUNLOCKNODE(np); 1911 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1912 return (error); 1913 } 1914 1915 /* 1916 * nfs file remove rpc called from nfs_inactive 1917 */ 1918 int 1919 ncl_removeit(struct sillyrename *sp, struct vnode *vp) 1920 { 1921 /* 1922 * Make sure that the directory vnode is still valid. 1923 * XXX we should lock sp->s_dvp here. 1924 */ 1925 if (sp->s_dvp->v_type == VBAD) 1926 return (0); 1927 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen, 1928 sp->s_cred, NULL)); 1929 } 1930 1931 /* 1932 * Nfs remove rpc, called from nfs_remove() and ncl_removeit(). 1933 */ 1934 static int 1935 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 1936 int namelen, struct ucred *cred, struct thread *td) 1937 { 1938 struct nfsvattr dnfsva; 1939 struct nfsnode *dnp = VTONFS(dvp); 1940 int error = 0, dattrflag; 1941 1942 NFSLOCKNODE(dnp); 1943 dnp->n_flag |= NREMOVEINPROG; 1944 NFSUNLOCKNODE(dnp); 1945 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva, 1946 &dattrflag, NULL); 1947 NFSLOCKNODE(dnp); 1948 if ((dnp->n_flag & NREMOVEWANT)) { 1949 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG); 1950 NFSUNLOCKNODE(dnp); 1951 wakeup((caddr_t)dnp); 1952 } else { 1953 dnp->n_flag &= ~NREMOVEINPROG; 1954 NFSUNLOCKNODE(dnp); 1955 } 1956 if (dattrflag) 1957 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1958 NFSLOCKNODE(dnp); 1959 dnp->n_flag |= NMODIFIED; 1960 if (!dattrflag) { 1961 dnp->n_attrstamp = 0; 1962 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1963 } 1964 NFSUNLOCKNODE(dnp); 1965 if (error && NFS_ISV4(dvp)) 1966 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1967 return (error); 1968 } 1969 1970 /* 1971 * nfs file rename call 1972 */ 1973 static int 1974 nfs_rename(struct vop_rename_args *ap) 1975 { 1976 struct vnode *fvp = ap->a_fvp; 1977 struct vnode *tvp = ap->a_tvp; 1978 struct vnode *fdvp = ap->a_fdvp; 1979 struct vnode *tdvp = ap->a_tdvp; 1980 struct componentname *tcnp = ap->a_tcnp; 1981 struct componentname *fcnp = ap->a_fcnp; 1982 struct nfsnode *fnp = VTONFS(ap->a_fvp); 1983 struct nfsnode *tdnp = VTONFS(ap->a_tdvp); 1984 struct nfsv4node *newv4 = NULL; 1985 int error; 1986 1987 KASSERT((tcnp->cn_flags & HASBUF) != 0 && 1988 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name")); 1989 /* Check for cross-device rename */ 1990 if ((fvp->v_mount != tdvp->v_mount) || 1991 (tvp && (fvp->v_mount != tvp->v_mount))) { 1992 error = EXDEV; 1993 goto out; 1994 } 1995 1996 if (fvp == tvp) { 1997 printf("nfs_rename: fvp == tvp (can't happen)\n"); 1998 error = 0; 1999 goto out; 2000 } 2001 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0) 2002 goto out; 2003 2004 /* 2005 * We have to flush B_DELWRI data prior to renaming 2006 * the file. If we don't, the delayed-write buffers 2007 * can be flushed out later after the file has gone stale 2008 * under NFSV3. NFSV2 does not have this problem because 2009 * ( as far as I can tell ) it flushes dirty buffers more 2010 * often. 2011 * 2012 * Skip the rename operation if the fsync fails, this can happen 2013 * due to the server's volume being full, when we pushed out data 2014 * that was written back to our cache earlier. Not checking for 2015 * this condition can result in potential (silent) data loss. 2016 */ 2017 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread); 2018 NFSVOPUNLOCK(fvp); 2019 if (!error && tvp) 2020 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread); 2021 if (error) 2022 goto out; 2023 2024 /* 2025 * If the tvp exists and is in use, sillyrename it before doing the 2026 * rename of the new file over it. 2027 * XXX Can't sillyrename a directory. 2028 */ 2029 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 2030 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 2031 vput(tvp); 2032 tvp = NULL; 2033 } 2034 2035 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen, 2036 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 2037 tcnp->cn_thread); 2038 2039 if (error == 0 && NFS_ISV4(tdvp)) { 2040 /* 2041 * For NFSv4, check to see if it is the same name and 2042 * replace the name, if it is different. 2043 */ 2044 newv4 = malloc( 2045 sizeof (struct nfsv4node) + 2046 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1, 2047 M_NFSV4NODE, M_WAITOK); 2048 NFSLOCKNODE(tdnp); 2049 NFSLOCKNODE(fnp); 2050 if (fnp->n_v4 != NULL && fvp->v_type == VREG && 2051 (fnp->n_v4->n4_namelen != tcnp->cn_namelen || 2052 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4), 2053 tcnp->cn_namelen) || 2054 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen || 2055 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 2056 tdnp->n_fhp->nfh_len))) { 2057 #ifdef notdef 2058 { char nnn[100]; int nnnl; 2059 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99; 2060 bcopy(tcnp->cn_nameptr, nnn, nnnl); 2061 nnn[nnnl] = '\0'; 2062 printf("ren replace=%s\n",nnn); 2063 } 2064 #endif 2065 free(fnp->n_v4, M_NFSV4NODE); 2066 fnp->n_v4 = newv4; 2067 newv4 = NULL; 2068 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len; 2069 fnp->n_v4->n4_namelen = tcnp->cn_namelen; 2070 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 2071 tdnp->n_fhp->nfh_len); 2072 NFSBCOPY(tcnp->cn_nameptr, 2073 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen); 2074 } 2075 NFSUNLOCKNODE(tdnp); 2076 NFSUNLOCKNODE(fnp); 2077 if (newv4 != NULL) 2078 free(newv4, M_NFSV4NODE); 2079 } 2080 2081 if (fvp->v_type == VDIR) { 2082 if (tvp != NULL && tvp->v_type == VDIR) 2083 cache_purge(tdvp); 2084 cache_purge(fdvp); 2085 } 2086 2087 out: 2088 if (tdvp == tvp) 2089 vrele(tdvp); 2090 else 2091 vput(tdvp); 2092 if (tvp) 2093 vput(tvp); 2094 vrele(fdvp); 2095 vrele(fvp); 2096 /* 2097 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 2098 */ 2099 if (error == ENOENT) 2100 error = 0; 2101 return (error); 2102 } 2103 2104 /* 2105 * nfs file rename rpc called from nfs_remove() above 2106 */ 2107 static int 2108 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp, 2109 struct sillyrename *sp) 2110 { 2111 2112 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen, 2113 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred, 2114 scnp->cn_thread)); 2115 } 2116 2117 /* 2118 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 2119 */ 2120 static int 2121 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr, 2122 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr, 2123 int tnamelen, struct ucred *cred, struct thread *td) 2124 { 2125 struct nfsvattr fnfsva, tnfsva; 2126 struct nfsnode *fdnp = VTONFS(fdvp); 2127 struct nfsnode *tdnp = VTONFS(tdvp); 2128 int error = 0, fattrflag, tattrflag; 2129 2130 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp, 2131 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag, 2132 &tattrflag, NULL, NULL); 2133 NFSLOCKNODE(fdnp); 2134 fdnp->n_flag |= NMODIFIED; 2135 if (fattrflag != 0) { 2136 NFSUNLOCKNODE(fdnp); 2137 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1); 2138 } else { 2139 fdnp->n_attrstamp = 0; 2140 NFSUNLOCKNODE(fdnp); 2141 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 2142 } 2143 NFSLOCKNODE(tdnp); 2144 tdnp->n_flag |= NMODIFIED; 2145 if (tattrflag != 0) { 2146 NFSUNLOCKNODE(tdnp); 2147 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1); 2148 } else { 2149 tdnp->n_attrstamp = 0; 2150 NFSUNLOCKNODE(tdnp); 2151 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2152 } 2153 if (error && NFS_ISV4(fdvp)) 2154 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2155 return (error); 2156 } 2157 2158 /* 2159 * nfs hard link create call 2160 */ 2161 static int 2162 nfs_link(struct vop_link_args *ap) 2163 { 2164 struct vnode *vp = ap->a_vp; 2165 struct vnode *tdvp = ap->a_tdvp; 2166 struct componentname *cnp = ap->a_cnp; 2167 struct nfsnode *np, *tdnp; 2168 struct nfsvattr nfsva, dnfsva; 2169 int error = 0, attrflag, dattrflag; 2170 2171 /* 2172 * Push all writes to the server, so that the attribute cache 2173 * doesn't get "out of sync" with the server. 2174 * XXX There should be a better way! 2175 */ 2176 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread); 2177 2178 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 2179 cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag, 2180 &dattrflag, NULL); 2181 tdnp = VTONFS(tdvp); 2182 NFSLOCKNODE(tdnp); 2183 tdnp->n_flag |= NMODIFIED; 2184 if (dattrflag != 0) { 2185 NFSUNLOCKNODE(tdnp); 2186 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1); 2187 } else { 2188 tdnp->n_attrstamp = 0; 2189 NFSUNLOCKNODE(tdnp); 2190 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2191 } 2192 if (attrflag) 2193 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2194 else { 2195 np = VTONFS(vp); 2196 NFSLOCKNODE(np); 2197 np->n_attrstamp = 0; 2198 NFSUNLOCKNODE(np); 2199 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 2200 } 2201 /* 2202 * If negative lookup caching is enabled, I might as well 2203 * add an entry for this node. Not necessary for correctness, 2204 * but if negative caching is enabled, then the system 2205 * must care about lookup caching hit rate, so... 2206 */ 2207 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 && 2208 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2209 if (tdvp != vp) 2210 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL); 2211 else 2212 printf("nfs_link: bogus NFS server returned " 2213 "the directory as the new link\n"); 2214 } 2215 if (error && NFS_ISV4(vp)) 2216 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0, 2217 (gid_t)0); 2218 return (error); 2219 } 2220 2221 /* 2222 * nfs symbolic link create call 2223 */ 2224 static int 2225 nfs_symlink(struct vop_symlink_args *ap) 2226 { 2227 struct vnode *dvp = ap->a_dvp; 2228 struct vattr *vap = ap->a_vap; 2229 struct componentname *cnp = ap->a_cnp; 2230 struct nfsvattr nfsva, dnfsva; 2231 struct nfsfh *nfhp; 2232 struct nfsnode *np = NULL, *dnp; 2233 struct vnode *newvp = NULL; 2234 int error = 0, attrflag, dattrflag, ret; 2235 2236 vap->va_type = VLNK; 2237 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2238 ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, 2239 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 2240 if (nfhp) { 2241 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread, 2242 &np, NULL, LK_EXCLUSIVE); 2243 if (!ret) 2244 newvp = NFSTOV(np); 2245 else if (!error) 2246 error = ret; 2247 } 2248 if (newvp != NULL) { 2249 if (attrflag) 2250 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2251 0, 1); 2252 } else if (!error) { 2253 /* 2254 * If we do not have an error and we could not extract the 2255 * newvp from the response due to the request being NFSv2, we 2256 * have to do a lookup in order to obtain a newvp to return. 2257 */ 2258 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2259 cnp->cn_cred, cnp->cn_thread, &np); 2260 if (!error) 2261 newvp = NFSTOV(np); 2262 } 2263 if (error) { 2264 if (newvp) 2265 vput(newvp); 2266 if (NFS_ISV4(dvp)) 2267 error = nfscl_maperr(cnp->cn_thread, error, 2268 vap->va_uid, vap->va_gid); 2269 } else { 2270 *ap->a_vpp = newvp; 2271 } 2272 2273 dnp = VTONFS(dvp); 2274 NFSLOCKNODE(dnp); 2275 dnp->n_flag |= NMODIFIED; 2276 if (dattrflag != 0) { 2277 NFSUNLOCKNODE(dnp); 2278 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2279 } else { 2280 dnp->n_attrstamp = 0; 2281 NFSUNLOCKNODE(dnp); 2282 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2283 } 2284 /* 2285 * If negative lookup caching is enabled, I might as well 2286 * add an entry for this node. Not necessary for correctness, 2287 * but if negative caching is enabled, then the system 2288 * must care about lookup caching hit rate, so... 2289 */ 2290 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2291 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2292 if (dvp != newvp) 2293 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 2294 NULL); 2295 else 2296 printf("nfs_symlink: bogus NFS server returned " 2297 "the directory as the new file object\n"); 2298 } 2299 return (error); 2300 } 2301 2302 /* 2303 * nfs make dir call 2304 */ 2305 static int 2306 nfs_mkdir(struct vop_mkdir_args *ap) 2307 { 2308 struct vnode *dvp = ap->a_dvp; 2309 struct vattr *vap = ap->a_vap; 2310 struct componentname *cnp = ap->a_cnp; 2311 struct nfsnode *np = NULL, *dnp; 2312 struct vnode *newvp = NULL; 2313 struct vattr vattr; 2314 struct nfsfh *nfhp; 2315 struct nfsvattr nfsva, dnfsva; 2316 int error = 0, attrflag, dattrflag, ret; 2317 2318 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2319 return (error); 2320 vap->va_type = VDIR; 2321 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2322 vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp, 2323 &attrflag, &dattrflag, NULL); 2324 dnp = VTONFS(dvp); 2325 NFSLOCKNODE(dnp); 2326 dnp->n_flag |= NMODIFIED; 2327 if (dattrflag != 0) { 2328 NFSUNLOCKNODE(dnp); 2329 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2330 } else { 2331 dnp->n_attrstamp = 0; 2332 NFSUNLOCKNODE(dnp); 2333 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2334 } 2335 if (nfhp) { 2336 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread, 2337 &np, NULL, LK_EXCLUSIVE); 2338 if (!ret) { 2339 newvp = NFSTOV(np); 2340 if (attrflag) 2341 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 2342 NULL, 0, 1); 2343 } else if (!error) 2344 error = ret; 2345 } 2346 if (!error && newvp == NULL) { 2347 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2348 cnp->cn_cred, cnp->cn_thread, &np); 2349 if (!error) { 2350 newvp = NFSTOV(np); 2351 if (newvp->v_type != VDIR) 2352 error = EEXIST; 2353 } 2354 } 2355 if (error) { 2356 if (newvp) 2357 vput(newvp); 2358 if (NFS_ISV4(dvp)) 2359 error = nfscl_maperr(cnp->cn_thread, error, 2360 vap->va_uid, vap->va_gid); 2361 } else { 2362 /* 2363 * If negative lookup caching is enabled, I might as well 2364 * add an entry for this node. Not necessary for correctness, 2365 * but if negative caching is enabled, then the system 2366 * must care about lookup caching hit rate, so... 2367 */ 2368 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2369 (cnp->cn_flags & MAKEENTRY) && 2370 attrflag != 0 && dattrflag != 0) { 2371 if (dvp != newvp) 2372 cache_enter_time(dvp, newvp, cnp, 2373 &nfsva.na_ctime, &dnfsva.na_ctime); 2374 else 2375 printf("nfs_mkdir: bogus NFS server returned " 2376 "the directory that the directory was " 2377 "created in as the new file object\n"); 2378 } 2379 *ap->a_vpp = newvp; 2380 } 2381 return (error); 2382 } 2383 2384 /* 2385 * nfs remove directory call 2386 */ 2387 static int 2388 nfs_rmdir(struct vop_rmdir_args *ap) 2389 { 2390 struct vnode *vp = ap->a_vp; 2391 struct vnode *dvp = ap->a_dvp; 2392 struct componentname *cnp = ap->a_cnp; 2393 struct nfsnode *dnp; 2394 struct nfsvattr dnfsva; 2395 int error, dattrflag; 2396 2397 if (dvp == vp) 2398 return (EINVAL); 2399 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2400 cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL); 2401 dnp = VTONFS(dvp); 2402 NFSLOCKNODE(dnp); 2403 dnp->n_flag |= NMODIFIED; 2404 if (dattrflag != 0) { 2405 NFSUNLOCKNODE(dnp); 2406 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2407 } else { 2408 dnp->n_attrstamp = 0; 2409 NFSUNLOCKNODE(dnp); 2410 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2411 } 2412 2413 cache_purge(dvp); 2414 cache_purge(vp); 2415 if (error && NFS_ISV4(dvp)) 2416 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0, 2417 (gid_t)0); 2418 /* 2419 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2420 */ 2421 if (error == ENOENT) 2422 error = 0; 2423 return (error); 2424 } 2425 2426 /* 2427 * nfs readdir call 2428 */ 2429 static int 2430 nfs_readdir(struct vop_readdir_args *ap) 2431 { 2432 struct vnode *vp = ap->a_vp; 2433 struct nfsnode *np = VTONFS(vp); 2434 struct uio *uio = ap->a_uio; 2435 ssize_t tresid, left; 2436 int error = 0; 2437 struct vattr vattr; 2438 2439 if (ap->a_eofflag != NULL) 2440 *ap->a_eofflag = 0; 2441 if (vp->v_type != VDIR) 2442 return(EPERM); 2443 2444 /* 2445 * First, check for hit on the EOF offset cache 2446 */ 2447 NFSLOCKNODE(np); 2448 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2449 (np->n_flag & NMODIFIED) == 0) { 2450 NFSUNLOCKNODE(np); 2451 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2452 NFSLOCKNODE(np); 2453 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) || 2454 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2455 NFSUNLOCKNODE(np); 2456 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits); 2457 if (ap->a_eofflag != NULL) 2458 *ap->a_eofflag = 1; 2459 return (0); 2460 } else 2461 NFSUNLOCKNODE(np); 2462 } 2463 } else 2464 NFSUNLOCKNODE(np); 2465 2466 /* 2467 * NFS always guarantees that directory entries don't straddle 2468 * DIRBLKSIZ boundaries. As such, we need to limit the size 2469 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial 2470 * directory entry. 2471 */ 2472 left = uio->uio_resid % DIRBLKSIZ; 2473 if (left == uio->uio_resid) 2474 return (EINVAL); 2475 uio->uio_resid -= left; 2476 2477 /* 2478 * Call ncl_bioread() to do the real work. 2479 */ 2480 tresid = uio->uio_resid; 2481 error = ncl_bioread(vp, uio, 0, ap->a_cred); 2482 2483 if (!error && uio->uio_resid == tresid) { 2484 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses); 2485 if (ap->a_eofflag != NULL) 2486 *ap->a_eofflag = 1; 2487 } 2488 2489 /* Add the partial DIRBLKSIZ (left) back in. */ 2490 uio->uio_resid += left; 2491 return (error); 2492 } 2493 2494 /* 2495 * Readdir rpc call. 2496 * Called from below the buffer cache by ncl_doio(). 2497 */ 2498 int 2499 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2500 struct thread *td) 2501 { 2502 struct nfsvattr nfsva; 2503 nfsuint64 *cookiep, cookie; 2504 struct nfsnode *dnp = VTONFS(vp); 2505 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2506 int error = 0, eof, attrflag; 2507 2508 KASSERT(uiop->uio_iovcnt == 1 && 2509 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2510 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2511 ("nfs readdirrpc bad uio")); 2512 2513 /* 2514 * If there is no cookie, assume directory was stale. 2515 */ 2516 ncl_dircookie_lock(dnp); 2517 NFSUNLOCKNODE(dnp); 2518 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2519 if (cookiep) { 2520 cookie = *cookiep; 2521 ncl_dircookie_unlock(dnp); 2522 } else { 2523 ncl_dircookie_unlock(dnp); 2524 return (NFSERR_BAD_COOKIE); 2525 } 2526 2527 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2528 (void)ncl_fsinfo(nmp, vp, cred, td); 2529 2530 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva, 2531 &attrflag, &eof, NULL); 2532 if (attrflag) 2533 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2534 2535 if (!error) { 2536 /* 2537 * We are now either at the end of the directory or have filled 2538 * the block. 2539 */ 2540 if (eof) { 2541 NFSLOCKNODE(dnp); 2542 dnp->n_direofoffset = uiop->uio_offset; 2543 NFSUNLOCKNODE(dnp); 2544 } else { 2545 if (uiop->uio_resid > 0) 2546 printf("EEK! readdirrpc resid > 0\n"); 2547 ncl_dircookie_lock(dnp); 2548 NFSUNLOCKNODE(dnp); 2549 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2550 *cookiep = cookie; 2551 ncl_dircookie_unlock(dnp); 2552 } 2553 } else if (NFS_ISV4(vp)) { 2554 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2555 } 2556 return (error); 2557 } 2558 2559 /* 2560 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc(). 2561 */ 2562 int 2563 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2564 struct thread *td) 2565 { 2566 struct nfsvattr nfsva; 2567 nfsuint64 *cookiep, cookie; 2568 struct nfsnode *dnp = VTONFS(vp); 2569 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2570 int error = 0, attrflag, eof; 2571 2572 KASSERT(uiop->uio_iovcnt == 1 && 2573 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2574 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2575 ("nfs readdirplusrpc bad uio")); 2576 2577 /* 2578 * If there is no cookie, assume directory was stale. 2579 */ 2580 ncl_dircookie_lock(dnp); 2581 NFSUNLOCKNODE(dnp); 2582 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2583 if (cookiep) { 2584 cookie = *cookiep; 2585 ncl_dircookie_unlock(dnp); 2586 } else { 2587 ncl_dircookie_unlock(dnp); 2588 return (NFSERR_BAD_COOKIE); 2589 } 2590 2591 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2592 (void)ncl_fsinfo(nmp, vp, cred, td); 2593 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva, 2594 &attrflag, &eof, NULL); 2595 if (attrflag) 2596 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2597 2598 if (!error) { 2599 /* 2600 * We are now either at end of the directory or have filled the 2601 * the block. 2602 */ 2603 if (eof) { 2604 NFSLOCKNODE(dnp); 2605 dnp->n_direofoffset = uiop->uio_offset; 2606 NFSUNLOCKNODE(dnp); 2607 } else { 2608 if (uiop->uio_resid > 0) 2609 printf("EEK! readdirplusrpc resid > 0\n"); 2610 ncl_dircookie_lock(dnp); 2611 NFSUNLOCKNODE(dnp); 2612 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2613 *cookiep = cookie; 2614 ncl_dircookie_unlock(dnp); 2615 } 2616 } else if (NFS_ISV4(vp)) { 2617 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2618 } 2619 return (error); 2620 } 2621 2622 /* 2623 * Silly rename. To make the NFS filesystem that is stateless look a little 2624 * more like the "ufs" a remove of an active vnode is translated to a rename 2625 * to a funny looking filename that is removed by nfs_inactive on the 2626 * nfsnode. There is the potential for another process on a different client 2627 * to create the same funny name between the nfs_lookitup() fails and the 2628 * nfs_rename() completes, but... 2629 */ 2630 static int 2631 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2632 { 2633 struct sillyrename *sp; 2634 struct nfsnode *np; 2635 int error; 2636 short pid; 2637 unsigned int lticks; 2638 2639 cache_purge(dvp); 2640 np = VTONFS(vp); 2641 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir")); 2642 sp = malloc(sizeof (struct sillyrename), 2643 M_NEWNFSREQ, M_WAITOK); 2644 sp->s_cred = crhold(cnp->cn_cred); 2645 sp->s_dvp = dvp; 2646 VREF(dvp); 2647 2648 /* 2649 * Fudge together a funny name. 2650 * Changing the format of the funny name to accommodate more 2651 * sillynames per directory. 2652 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2653 * CPU ticks since boot. 2654 */ 2655 pid = cnp->cn_thread->td_proc->p_pid; 2656 lticks = (unsigned int)ticks; 2657 for ( ; ; ) { 2658 sp->s_namlen = sprintf(sp->s_name, 2659 ".nfs.%08x.%04x4.4", lticks, 2660 pid); 2661 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2662 cnp->cn_thread, NULL)) 2663 break; 2664 lticks++; 2665 } 2666 error = nfs_renameit(dvp, vp, cnp, sp); 2667 if (error) 2668 goto bad; 2669 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2670 cnp->cn_thread, &np); 2671 np->n_sillyrename = sp; 2672 return (0); 2673 bad: 2674 vrele(sp->s_dvp); 2675 crfree(sp->s_cred); 2676 free(sp, M_NEWNFSREQ); 2677 return (error); 2678 } 2679 2680 /* 2681 * Look up a file name and optionally either update the file handle or 2682 * allocate an nfsnode, depending on the value of npp. 2683 * npp == NULL --> just do the lookup 2684 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2685 * handled too 2686 * *npp != NULL --> update the file handle in the vnode 2687 */ 2688 static int 2689 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred, 2690 struct thread *td, struct nfsnode **npp) 2691 { 2692 struct vnode *newvp = NULL, *vp; 2693 struct nfsnode *np, *dnp = VTONFS(dvp); 2694 struct nfsfh *nfhp, *onfhp; 2695 struct nfsvattr nfsva, dnfsva; 2696 struct componentname cn; 2697 int error = 0, attrflag, dattrflag; 2698 u_int hash; 2699 struct timespec ts; 2700 2701 nanouptime(&ts); 2702 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva, 2703 &nfhp, &attrflag, &dattrflag, NULL); 2704 if (dattrflag) 2705 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2706 if (npp && !error) { 2707 if (*npp != NULL) { 2708 np = *npp; 2709 vp = NFSTOV(np); 2710 /* 2711 * For NFSv4, check to see if it is the same name and 2712 * replace the name, if it is different. 2713 */ 2714 if (np->n_v4 != NULL && nfsva.na_type == VREG && 2715 (np->n_v4->n4_namelen != len || 2716 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) || 2717 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen || 2718 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2719 dnp->n_fhp->nfh_len))) { 2720 #ifdef notdef 2721 { char nnn[100]; int nnnl; 2722 nnnl = (len < 100) ? len : 99; 2723 bcopy(name, nnn, nnnl); 2724 nnn[nnnl] = '\0'; 2725 printf("replace=%s\n",nnn); 2726 } 2727 #endif 2728 free(np->n_v4, M_NFSV4NODE); 2729 np->n_v4 = malloc( 2730 sizeof (struct nfsv4node) + 2731 dnp->n_fhp->nfh_len + len - 1, 2732 M_NFSV4NODE, M_WAITOK); 2733 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len; 2734 np->n_v4->n4_namelen = len; 2735 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2736 dnp->n_fhp->nfh_len); 2737 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len); 2738 } 2739 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, 2740 FNV1_32_INIT); 2741 onfhp = np->n_fhp; 2742 /* 2743 * Rehash node for new file handle. 2744 */ 2745 vfs_hash_rehash(vp, hash); 2746 np->n_fhp = nfhp; 2747 if (onfhp != NULL) 2748 free(onfhp, M_NFSFH); 2749 newvp = NFSTOV(np); 2750 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) { 2751 free(nfhp, M_NFSFH); 2752 VREF(dvp); 2753 newvp = dvp; 2754 } else { 2755 cn.cn_nameptr = name; 2756 cn.cn_namelen = len; 2757 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td, 2758 &np, NULL, LK_EXCLUSIVE); 2759 if (error) 2760 return (error); 2761 newvp = NFSTOV(np); 2762 /* 2763 * If n_localmodtime >= time before RPC, then 2764 * a file modification operation, such as 2765 * VOP_SETATTR() of size, has occurred while 2766 * the Lookup RPC and acquisition of the vnode 2767 * happened. As such, the attributes might 2768 * be stale, with possibly an incorrect size. 2769 */ 2770 NFSLOCKNODE(np); 2771 if (timespecisset(&np->n_localmodtime) && 2772 timespeccmp(&np->n_localmodtime, &ts, >=)) { 2773 NFSCL_DEBUG(4, "nfs_lookitup: localmod " 2774 "stale attributes\n"); 2775 attrflag = 0; 2776 } 2777 NFSUNLOCKNODE(np); 2778 } 2779 if (!attrflag && *npp == NULL) { 2780 if (newvp == dvp) 2781 vrele(newvp); 2782 else 2783 vput(newvp); 2784 return (ENOENT); 2785 } 2786 if (attrflag) 2787 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2788 0, 1); 2789 } 2790 if (npp && *npp == NULL) { 2791 if (error) { 2792 if (newvp) { 2793 if (newvp == dvp) 2794 vrele(newvp); 2795 else 2796 vput(newvp); 2797 } 2798 } else 2799 *npp = np; 2800 } 2801 if (error && NFS_ISV4(dvp)) 2802 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2803 return (error); 2804 } 2805 2806 /* 2807 * Nfs Version 3 and 4 commit rpc 2808 */ 2809 int 2810 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2811 struct thread *td) 2812 { 2813 struct nfsvattr nfsva; 2814 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2815 struct nfsnode *np; 2816 struct uio uio; 2817 int error, attrflag; 2818 2819 np = VTONFS(vp); 2820 error = EIO; 2821 attrflag = 0; 2822 if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) { 2823 uio.uio_offset = offset; 2824 uio.uio_resid = cnt; 2825 error = nfscl_doiods(vp, &uio, NULL, NULL, 2826 NFSV4OPEN_ACCESSWRITE, 1, cred, td); 2827 if (error != 0) { 2828 NFSLOCKNODE(np); 2829 np->n_flag &= ~NDSCOMMIT; 2830 NFSUNLOCKNODE(np); 2831 } 2832 } 2833 if (error != 0) { 2834 mtx_lock(&nmp->nm_mtx); 2835 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2836 mtx_unlock(&nmp->nm_mtx); 2837 return (0); 2838 } 2839 mtx_unlock(&nmp->nm_mtx); 2840 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva, 2841 &attrflag, NULL); 2842 } 2843 if (attrflag != 0) 2844 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 2845 0, 1); 2846 if (error != 0 && NFS_ISV4(vp)) 2847 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2848 return (error); 2849 } 2850 2851 /* 2852 * Strategy routine. 2853 * For async requests when nfsiod(s) are running, queue the request by 2854 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the 2855 * request. 2856 */ 2857 static int 2858 nfs_strategy(struct vop_strategy_args *ap) 2859 { 2860 struct buf *bp; 2861 struct vnode *vp; 2862 struct ucred *cr; 2863 2864 bp = ap->a_bp; 2865 vp = ap->a_vp; 2866 KASSERT(bp->b_vp == vp, ("missing b_getvp")); 2867 KASSERT(!(bp->b_flags & B_DONE), 2868 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2869 2870 if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno) 2871 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize / 2872 DEV_BSIZE); 2873 if (bp->b_iocmd == BIO_READ) 2874 cr = bp->b_rcred; 2875 else 2876 cr = bp->b_wcred; 2877 2878 /* 2879 * If the op is asynchronous and an i/o daemon is waiting 2880 * queue the request, wake it up and wait for completion 2881 * otherwise just do it ourselves. 2882 */ 2883 if ((bp->b_flags & B_ASYNC) == 0 || 2884 ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread)) 2885 (void) ncl_doio(vp, bp, cr, curthread, 1); 2886 return (0); 2887 } 2888 2889 /* 2890 * fsync vnode op. Just call ncl_flush() with commit == 1. 2891 */ 2892 /* ARGSUSED */ 2893 static int 2894 nfs_fsync(struct vop_fsync_args *ap) 2895 { 2896 2897 if (ap->a_vp->v_type != VREG) { 2898 /* 2899 * For NFS, metadata is changed synchronously on the server, 2900 * so there is nothing to flush. Also, ncl_flush() clears 2901 * the NMODIFIED flag and that shouldn't be done here for 2902 * directories. 2903 */ 2904 return (0); 2905 } 2906 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0)); 2907 } 2908 2909 /* 2910 * Flush all the blocks associated with a vnode. 2911 * Walk through the buffer pool and push any dirty pages 2912 * associated with the vnode. 2913 * If the called_from_renewthread argument is TRUE, it has been called 2914 * from the NFSv4 renew thread and, as such, cannot block indefinitely 2915 * waiting for a buffer write to complete. 2916 */ 2917 int 2918 ncl_flush(struct vnode *vp, int waitfor, struct thread *td, 2919 int commit, int called_from_renewthread) 2920 { 2921 struct nfsnode *np = VTONFS(vp); 2922 struct buf *bp; 2923 int i; 2924 struct buf *nbp; 2925 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2926 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2927 int passone = 1, trycnt = 0; 2928 u_quad_t off, endoff, toff; 2929 struct ucred* wcred = NULL; 2930 struct buf **bvec = NULL; 2931 struct bufobj *bo; 2932 #ifndef NFS_COMMITBVECSIZ 2933 #define NFS_COMMITBVECSIZ 20 2934 #endif 2935 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2936 u_int bvecsize = 0, bveccount; 2937 struct timespec ts; 2938 2939 if (called_from_renewthread != 0) 2940 slptimeo = hz; 2941 if (nmp->nm_flag & NFSMNT_INT) 2942 slpflag = PCATCH; 2943 if (!commit) 2944 passone = 0; 2945 bo = &vp->v_bufobj; 2946 /* 2947 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2948 * server, but has not been committed to stable storage on the server 2949 * yet. On the first pass, the byte range is worked out and the commit 2950 * rpc is done. On the second pass, ncl_writebp() is called to do the 2951 * job. 2952 */ 2953 again: 2954 off = (u_quad_t)-1; 2955 endoff = 0; 2956 bvecpos = 0; 2957 if (NFS_ISV34(vp) && commit) { 2958 if (bvec != NULL && bvec != bvec_on_stack) 2959 free(bvec, M_TEMP); 2960 /* 2961 * Count up how many buffers waiting for a commit. 2962 */ 2963 bveccount = 0; 2964 BO_LOCK(bo); 2965 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2966 if (!BUF_ISLOCKED(bp) && 2967 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2968 == (B_DELWRI | B_NEEDCOMMIT)) 2969 bveccount++; 2970 } 2971 /* 2972 * Allocate space to remember the list of bufs to commit. It is 2973 * important to use M_NOWAIT here to avoid a race with nfs_write. 2974 * If we can't get memory (for whatever reason), we will end up 2975 * committing the buffers one-by-one in the loop below. 2976 */ 2977 if (bveccount > NFS_COMMITBVECSIZ) { 2978 /* 2979 * Release the vnode interlock to avoid a lock 2980 * order reversal. 2981 */ 2982 BO_UNLOCK(bo); 2983 bvec = (struct buf **) 2984 malloc(bveccount * sizeof(struct buf *), 2985 M_TEMP, M_NOWAIT); 2986 BO_LOCK(bo); 2987 if (bvec == NULL) { 2988 bvec = bvec_on_stack; 2989 bvecsize = NFS_COMMITBVECSIZ; 2990 } else 2991 bvecsize = bveccount; 2992 } else { 2993 bvec = bvec_on_stack; 2994 bvecsize = NFS_COMMITBVECSIZ; 2995 } 2996 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2997 if (bvecpos >= bvecsize) 2998 break; 2999 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3000 nbp = TAILQ_NEXT(bp, b_bobufs); 3001 continue; 3002 } 3003 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3004 (B_DELWRI | B_NEEDCOMMIT)) { 3005 BUF_UNLOCK(bp); 3006 nbp = TAILQ_NEXT(bp, b_bobufs); 3007 continue; 3008 } 3009 BO_UNLOCK(bo); 3010 bremfree(bp); 3011 /* 3012 * Work out if all buffers are using the same cred 3013 * so we can deal with them all with one commit. 3014 * 3015 * NOTE: we are not clearing B_DONE here, so we have 3016 * to do it later on in this routine if we intend to 3017 * initiate I/O on the bp. 3018 * 3019 * Note: to avoid loopback deadlocks, we do not 3020 * assign b_runningbufspace. 3021 */ 3022 if (wcred == NULL) 3023 wcred = bp->b_wcred; 3024 else if (wcred != bp->b_wcred) 3025 wcred = NOCRED; 3026 vfs_busy_pages(bp, 1); 3027 3028 BO_LOCK(bo); 3029 /* 3030 * bp is protected by being locked, but nbp is not 3031 * and vfs_busy_pages() may sleep. We have to 3032 * recalculate nbp. 3033 */ 3034 nbp = TAILQ_NEXT(bp, b_bobufs); 3035 3036 /* 3037 * A list of these buffers is kept so that the 3038 * second loop knows which buffers have actually 3039 * been committed. This is necessary, since there 3040 * may be a race between the commit rpc and new 3041 * uncommitted writes on the file. 3042 */ 3043 bvec[bvecpos++] = bp; 3044 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3045 bp->b_dirtyoff; 3046 if (toff < off) 3047 off = toff; 3048 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 3049 if (toff > endoff) 3050 endoff = toff; 3051 } 3052 BO_UNLOCK(bo); 3053 } 3054 if (bvecpos > 0) { 3055 /* 3056 * Commit data on the server, as required. 3057 * If all bufs are using the same wcred, then use that with 3058 * one call for all of them, otherwise commit each one 3059 * separately. 3060 */ 3061 if (wcred != NOCRED) 3062 retv = ncl_commit(vp, off, (int)(endoff - off), 3063 wcred, td); 3064 else { 3065 retv = 0; 3066 for (i = 0; i < bvecpos; i++) { 3067 off_t off, size; 3068 bp = bvec[i]; 3069 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3070 bp->b_dirtyoff; 3071 size = (u_quad_t)(bp->b_dirtyend 3072 - bp->b_dirtyoff); 3073 retv = ncl_commit(vp, off, (int)size, 3074 bp->b_wcred, td); 3075 if (retv) break; 3076 } 3077 } 3078 3079 if (retv == NFSERR_STALEWRITEVERF) 3080 ncl_clearcommit(vp->v_mount); 3081 3082 /* 3083 * Now, either mark the blocks I/O done or mark the 3084 * blocks dirty, depending on whether the commit 3085 * succeeded. 3086 */ 3087 for (i = 0; i < bvecpos; i++) { 3088 bp = bvec[i]; 3089 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3090 if (!NFSCL_FORCEDISM(vp->v_mount) && retv) { 3091 /* 3092 * Error, leave B_DELWRI intact 3093 */ 3094 vfs_unbusy_pages(bp); 3095 brelse(bp); 3096 } else { 3097 /* 3098 * Success, remove B_DELWRI ( bundirty() ). 3099 * 3100 * b_dirtyoff/b_dirtyend seem to be NFS 3101 * specific. We should probably move that 3102 * into bundirty(). XXX 3103 */ 3104 bufobj_wref(bo); 3105 bp->b_flags |= B_ASYNC; 3106 bundirty(bp); 3107 bp->b_flags &= ~B_DONE; 3108 bp->b_ioflags &= ~BIO_ERROR; 3109 bp->b_dirtyoff = bp->b_dirtyend = 0; 3110 bufdone(bp); 3111 } 3112 } 3113 } 3114 3115 /* 3116 * Start/do any write(s) that are required. 3117 */ 3118 loop: 3119 BO_LOCK(bo); 3120 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3121 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3122 if (waitfor != MNT_WAIT || passone) 3123 continue; 3124 3125 error = BUF_TIMELOCK(bp, 3126 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 3127 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo); 3128 if (error == 0) { 3129 BUF_UNLOCK(bp); 3130 goto loop; 3131 } 3132 if (error == ENOLCK) { 3133 error = 0; 3134 goto loop; 3135 } 3136 if (called_from_renewthread != 0) { 3137 /* 3138 * Return EIO so the flush will be retried 3139 * later. 3140 */ 3141 error = EIO; 3142 goto done; 3143 } 3144 if (newnfs_sigintr(nmp, td)) { 3145 error = EINTR; 3146 goto done; 3147 } 3148 if (slpflag == PCATCH) { 3149 slpflag = 0; 3150 slptimeo = 2 * hz; 3151 } 3152 goto loop; 3153 } 3154 if ((bp->b_flags & B_DELWRI) == 0) 3155 panic("nfs_fsync: not dirty"); 3156 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3157 BUF_UNLOCK(bp); 3158 continue; 3159 } 3160 BO_UNLOCK(bo); 3161 bremfree(bp); 3162 bp->b_flags |= B_ASYNC; 3163 bwrite(bp); 3164 if (newnfs_sigintr(nmp, td)) { 3165 error = EINTR; 3166 goto done; 3167 } 3168 goto loop; 3169 } 3170 if (passone) { 3171 passone = 0; 3172 BO_UNLOCK(bo); 3173 goto again; 3174 } 3175 if (waitfor == MNT_WAIT) { 3176 while (bo->bo_numoutput) { 3177 error = bufobj_wwait(bo, slpflag, slptimeo); 3178 if (error) { 3179 BO_UNLOCK(bo); 3180 if (called_from_renewthread != 0) { 3181 /* 3182 * Return EIO so that the flush will be 3183 * retried later. 3184 */ 3185 error = EIO; 3186 goto done; 3187 } 3188 error = newnfs_sigintr(nmp, td); 3189 if (error) 3190 goto done; 3191 if (slpflag == PCATCH) { 3192 slpflag = 0; 3193 slptimeo = 2 * hz; 3194 } 3195 BO_LOCK(bo); 3196 } 3197 } 3198 if (bo->bo_dirty.bv_cnt != 0 && commit) { 3199 BO_UNLOCK(bo); 3200 goto loop; 3201 } 3202 /* 3203 * Wait for all the async IO requests to drain 3204 */ 3205 BO_UNLOCK(bo); 3206 NFSLOCKNODE(np); 3207 while (np->n_directio_asyncwr > 0) { 3208 np->n_flag |= NFSYNCWAIT; 3209 error = newnfs_msleep(td, &np->n_directio_asyncwr, 3210 &np->n_mtx, slpflag | (PRIBIO + 1), 3211 "nfsfsync", 0); 3212 if (error) { 3213 if (newnfs_sigintr(nmp, td)) { 3214 NFSUNLOCKNODE(np); 3215 error = EINTR; 3216 goto done; 3217 } 3218 } 3219 } 3220 NFSUNLOCKNODE(np); 3221 } else 3222 BO_UNLOCK(bo); 3223 if (NFSHASPNFS(nmp)) { 3224 nfscl_layoutcommit(vp, td); 3225 /* 3226 * Invalidate the attribute cache, since writes to a DS 3227 * won't update the size attribute. 3228 */ 3229 NFSLOCKNODE(np); 3230 np->n_attrstamp = 0; 3231 } else 3232 NFSLOCKNODE(np); 3233 if (np->n_flag & NWRITEERR) { 3234 error = np->n_error; 3235 np->n_flag &= ~NWRITEERR; 3236 } 3237 if (commit && bo->bo_dirty.bv_cnt == 0 && 3238 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) 3239 np->n_flag &= ~NMODIFIED; 3240 NFSUNLOCKNODE(np); 3241 done: 3242 if (bvec != NULL && bvec != bvec_on_stack) 3243 free(bvec, M_TEMP); 3244 if (error == 0 && commit != 0 && waitfor == MNT_WAIT && 3245 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 || 3246 np->n_directio_asyncwr != 0)) { 3247 if (trycnt++ < 5) { 3248 /* try, try again... */ 3249 passone = 1; 3250 wcred = NULL; 3251 bvec = NULL; 3252 bvecsize = 0; 3253 goto again; 3254 } 3255 vn_printf(vp, "ncl_flush failed"); 3256 error = called_from_renewthread != 0 ? EIO : EBUSY; 3257 } 3258 if (error == 0) { 3259 nanouptime(&ts); 3260 NFSLOCKNODE(np); 3261 np->n_localmodtime = ts; 3262 NFSUNLOCKNODE(np); 3263 } 3264 return (error); 3265 } 3266 3267 /* 3268 * NFS advisory byte-level locks. 3269 */ 3270 static int 3271 nfs_advlock(struct vop_advlock_args *ap) 3272 { 3273 struct vnode *vp = ap->a_vp; 3274 struct ucred *cred; 3275 struct nfsnode *np = VTONFS(ap->a_vp); 3276 struct proc *p = (struct proc *)ap->a_id; 3277 struct thread *td = curthread; /* XXX */ 3278 struct vattr va; 3279 int ret, error; 3280 u_quad_t size; 3281 struct nfsmount *nmp; 3282 3283 error = NFSVOPLOCK(vp, LK_SHARED); 3284 if (error != 0) 3285 return (EBADF); 3286 nmp = VFSTONFS(vp->v_mount); 3287 if (!NFS_ISV4(vp) || (nmp->nm_flag & NFSMNT_NOLOCKD) != 0) { 3288 if ((nmp->nm_flag & NFSMNT_NOLOCKD) != 0) { 3289 size = np->n_size; 3290 NFSVOPUNLOCK(vp); 3291 error = lf_advlock(ap, &(vp->v_lockf), size); 3292 } else { 3293 if (nfs_advlock_p != NULL) 3294 error = nfs_advlock_p(ap); 3295 else { 3296 NFSVOPUNLOCK(vp); 3297 error = ENOLCK; 3298 } 3299 } 3300 if (error == 0 && ap->a_op == F_SETLK) { 3301 error = NFSVOPLOCK(vp, LK_SHARED); 3302 if (error == 0) { 3303 /* Mark that a file lock has been acquired. */ 3304 NFSLOCKNODE(np); 3305 np->n_flag |= NHASBEENLOCKED; 3306 NFSUNLOCKNODE(np); 3307 NFSVOPUNLOCK(vp); 3308 } 3309 } 3310 return (error); 3311 } else if ((ap->a_flags & (F_POSIX | F_FLOCK)) != 0) { 3312 if (vp->v_type != VREG) { 3313 error = EINVAL; 3314 goto out; 3315 } 3316 if ((ap->a_flags & F_POSIX) != 0) 3317 cred = p->p_ucred; 3318 else 3319 cred = td->td_ucred; 3320 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY); 3321 if (VN_IS_DOOMED(vp)) { 3322 error = EBADF; 3323 goto out; 3324 } 3325 3326 /* 3327 * If this is unlocking a write locked region, flush and 3328 * commit them before unlocking. This is required by 3329 * RFC3530 Sec. 9.3.2. 3330 */ 3331 if (ap->a_op == F_UNLCK && 3332 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id, 3333 ap->a_flags)) 3334 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0); 3335 3336 /* 3337 * Mark NFS node as might have acquired a lock. 3338 * This is separate from NHASBEENLOCKED, because it must 3339 * be done before the nfsrpc_advlock() call, which might 3340 * add a nfscllock structure to the client state. 3341 * It is used to check for the case where a nfscllock 3342 * state structure cannot exist for the file. 3343 * Only done for "oneopenown" NFSv4.1/4.2 mounts. 3344 */ 3345 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp)) { 3346 NFSLOCKNODE(np); 3347 np->n_flag |= NMIGHTBELOCKED; 3348 NFSUNLOCKNODE(np); 3349 } 3350 3351 /* 3352 * Loop around doing the lock op, while a blocking lock 3353 * must wait for the lock op to succeed. 3354 */ 3355 do { 3356 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op, 3357 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags); 3358 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3359 ap->a_op == F_SETLK) { 3360 NFSVOPUNLOCK(vp); 3361 error = nfs_catnap(PZERO | PCATCH, ret, 3362 "ncladvl"); 3363 if (error) 3364 return (EINTR); 3365 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY); 3366 if (VN_IS_DOOMED(vp)) { 3367 error = EBADF; 3368 goto out; 3369 } 3370 } 3371 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3372 ap->a_op == F_SETLK); 3373 if (ret == NFSERR_DENIED) { 3374 error = EAGAIN; 3375 goto out; 3376 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) { 3377 error = ret; 3378 goto out; 3379 } else if (ret != 0) { 3380 error = EACCES; 3381 goto out; 3382 } 3383 3384 /* 3385 * Now, if we just got a lock, invalidate data in the buffer 3386 * cache, as required, so that the coherency conforms with 3387 * RFC3530 Sec. 9.3.2. 3388 */ 3389 if (ap->a_op == F_SETLK) { 3390 if ((np->n_flag & NMODIFIED) == 0) { 3391 np->n_attrstamp = 0; 3392 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3393 ret = VOP_GETATTR(vp, &va, cred); 3394 } 3395 if ((np->n_flag & NMODIFIED) || ret || 3396 np->n_change != va.va_filerev) { 3397 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1); 3398 np->n_attrstamp = 0; 3399 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3400 ret = VOP_GETATTR(vp, &va, cred); 3401 if (!ret) { 3402 np->n_mtime = va.va_mtime; 3403 np->n_change = va.va_filerev; 3404 } 3405 } 3406 /* Mark that a file lock has been acquired. */ 3407 NFSLOCKNODE(np); 3408 np->n_flag |= NHASBEENLOCKED; 3409 NFSUNLOCKNODE(np); 3410 } 3411 } else 3412 error = EOPNOTSUPP; 3413 out: 3414 NFSVOPUNLOCK(vp); 3415 return (error); 3416 } 3417 3418 /* 3419 * NFS advisory byte-level locks. 3420 */ 3421 static int 3422 nfs_advlockasync(struct vop_advlockasync_args *ap) 3423 { 3424 struct vnode *vp = ap->a_vp; 3425 u_quad_t size; 3426 int error; 3427 3428 error = NFSVOPLOCK(vp, LK_SHARED); 3429 if (error) 3430 return (error); 3431 if (NFS_ISV4(vp)) { 3432 NFSVOPUNLOCK(vp); 3433 return (EOPNOTSUPP); 3434 } 3435 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3436 size = VTONFS(vp)->n_size; 3437 NFSVOPUNLOCK(vp); 3438 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3439 } else { 3440 NFSVOPUNLOCK(vp); 3441 error = EOPNOTSUPP; 3442 } 3443 return (error); 3444 } 3445 3446 /* 3447 * Print out the contents of an nfsnode. 3448 */ 3449 static int 3450 nfs_print(struct vop_print_args *ap) 3451 { 3452 struct vnode *vp = ap->a_vp; 3453 struct nfsnode *np = VTONFS(vp); 3454 3455 printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid, 3456 (uintmax_t)np->n_vattr.na_fsid); 3457 if (vp->v_type == VFIFO) 3458 fifo_printinfo(vp); 3459 printf("\n"); 3460 return (0); 3461 } 3462 3463 /* 3464 * This is the "real" nfs::bwrite(struct buf*). 3465 * We set B_CACHE if this is a VMIO buffer. 3466 */ 3467 int 3468 ncl_writebp(struct buf *bp, int force __unused, struct thread *td) 3469 { 3470 int oldflags, rtval; 3471 3472 if (bp->b_flags & B_INVAL) { 3473 brelse(bp); 3474 return (0); 3475 } 3476 3477 oldflags = bp->b_flags; 3478 bp->b_flags |= B_CACHE; 3479 3480 /* 3481 * Undirty the bp. We will redirty it later if the I/O fails. 3482 */ 3483 bundirty(bp); 3484 bp->b_flags &= ~B_DONE; 3485 bp->b_ioflags &= ~BIO_ERROR; 3486 bp->b_iocmd = BIO_WRITE; 3487 3488 bufobj_wref(bp->b_bufobj); 3489 curthread->td_ru.ru_oublock++; 3490 3491 /* 3492 * Note: to avoid loopback deadlocks, we do not 3493 * assign b_runningbufspace. 3494 */ 3495 vfs_busy_pages(bp, 1); 3496 3497 BUF_KERNPROC(bp); 3498 bp->b_iooffset = dbtob(bp->b_blkno); 3499 bstrategy(bp); 3500 3501 if ((oldflags & B_ASYNC) != 0) 3502 return (0); 3503 3504 rtval = bufwait(bp); 3505 if (oldflags & B_DELWRI) 3506 reassignbuf(bp); 3507 brelse(bp); 3508 return (rtval); 3509 } 3510 3511 /* 3512 * nfs special file access vnode op. 3513 * Essentially just get vattr and then imitate iaccess() since the device is 3514 * local to the client. 3515 */ 3516 static int 3517 nfsspec_access(struct vop_access_args *ap) 3518 { 3519 struct vattr *vap; 3520 struct ucred *cred = ap->a_cred; 3521 struct vnode *vp = ap->a_vp; 3522 accmode_t accmode = ap->a_accmode; 3523 struct vattr vattr; 3524 int error; 3525 3526 /* 3527 * Disallow write attempts on filesystems mounted read-only; 3528 * unless the file is a socket, fifo, or a block or character 3529 * device resident on the filesystem. 3530 */ 3531 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3532 switch (vp->v_type) { 3533 case VREG: 3534 case VDIR: 3535 case VLNK: 3536 return (EROFS); 3537 default: 3538 break; 3539 } 3540 } 3541 vap = &vattr; 3542 error = VOP_GETATTR(vp, vap, cred); 3543 if (error) 3544 goto out; 3545 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3546 accmode, cred); 3547 out: 3548 return error; 3549 } 3550 3551 /* 3552 * Read wrapper for fifos. 3553 */ 3554 static int 3555 nfsfifo_read(struct vop_read_args *ap) 3556 { 3557 struct nfsnode *np = VTONFS(ap->a_vp); 3558 int error; 3559 3560 /* 3561 * Set access flag. 3562 */ 3563 NFSLOCKNODE(np); 3564 np->n_flag |= NACC; 3565 vfs_timestamp(&np->n_atim); 3566 NFSUNLOCKNODE(np); 3567 error = fifo_specops.vop_read(ap); 3568 return error; 3569 } 3570 3571 /* 3572 * Write wrapper for fifos. 3573 */ 3574 static int 3575 nfsfifo_write(struct vop_write_args *ap) 3576 { 3577 struct nfsnode *np = VTONFS(ap->a_vp); 3578 3579 /* 3580 * Set update flag. 3581 */ 3582 NFSLOCKNODE(np); 3583 np->n_flag |= NUPD; 3584 vfs_timestamp(&np->n_mtim); 3585 NFSUNLOCKNODE(np); 3586 return(fifo_specops.vop_write(ap)); 3587 } 3588 3589 /* 3590 * Close wrapper for fifos. 3591 * 3592 * Update the times on the nfsnode then do fifo close. 3593 */ 3594 static int 3595 nfsfifo_close(struct vop_close_args *ap) 3596 { 3597 struct vnode *vp = ap->a_vp; 3598 struct nfsnode *np = VTONFS(vp); 3599 struct vattr vattr; 3600 struct timespec ts; 3601 3602 NFSLOCKNODE(np); 3603 if (np->n_flag & (NACC | NUPD)) { 3604 vfs_timestamp(&ts); 3605 if (np->n_flag & NACC) 3606 np->n_atim = ts; 3607 if (np->n_flag & NUPD) 3608 np->n_mtim = ts; 3609 np->n_flag |= NCHG; 3610 if (vrefcnt(vp) == 1 && 3611 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3612 VATTR_NULL(&vattr); 3613 if (np->n_flag & NACC) 3614 vattr.va_atime = np->n_atim; 3615 if (np->n_flag & NUPD) 3616 vattr.va_mtime = np->n_mtim; 3617 NFSUNLOCKNODE(np); 3618 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3619 goto out; 3620 } 3621 } 3622 NFSUNLOCKNODE(np); 3623 out: 3624 return (fifo_specops.vop_close(ap)); 3625 } 3626 3627 /* 3628 * Just call ncl_writebp() with the force argument set to 1. 3629 * 3630 * NOTE: B_DONE may or may not be set in a_bp on call. 3631 */ 3632 static int 3633 nfs_bwrite(struct buf *bp) 3634 { 3635 3636 return (ncl_writebp(bp, 1, curthread)); 3637 } 3638 3639 struct buf_ops buf_ops_newnfs = { 3640 .bop_name = "buf_ops_nfs", 3641 .bop_write = nfs_bwrite, 3642 .bop_strategy = bufstrategy, 3643 .bop_sync = bufsync, 3644 .bop_bdflush = bufbdflush, 3645 }; 3646 3647 static int 3648 nfs_getacl(struct vop_getacl_args *ap) 3649 { 3650 int error; 3651 3652 if (ap->a_type != ACL_TYPE_NFS4) 3653 return (EOPNOTSUPP); 3654 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3655 NULL); 3656 if (error > NFSERR_STALE) { 3657 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3658 error = EPERM; 3659 } 3660 return (error); 3661 } 3662 3663 static int 3664 nfs_setacl(struct vop_setacl_args *ap) 3665 { 3666 int error; 3667 3668 if (ap->a_type != ACL_TYPE_NFS4) 3669 return (EOPNOTSUPP); 3670 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3671 NULL); 3672 if (error > NFSERR_STALE) { 3673 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3674 error = EPERM; 3675 } 3676 return (error); 3677 } 3678 3679 /* 3680 * VOP_ADVISE for NFS. 3681 * Just return 0 for any errors, since it is just a hint. 3682 */ 3683 static int 3684 nfs_advise(struct vop_advise_args *ap) 3685 { 3686 struct thread *td = curthread; 3687 struct nfsmount *nmp; 3688 uint64_t len; 3689 int error; 3690 3691 /* 3692 * First do vop_stdadvise() to handle the buffer cache. 3693 */ 3694 error = vop_stdadvise(ap); 3695 if (error != 0) 3696 return (error); 3697 if (ap->a_start < 0 || ap->a_end < 0) 3698 return (0); 3699 if (ap->a_end == OFF_MAX) 3700 len = 0; 3701 else if (ap->a_end < ap->a_start) 3702 return (0); 3703 else 3704 len = ap->a_end - ap->a_start + 1; 3705 nmp = VFSTONFS(ap->a_vp->v_mount); 3706 mtx_lock(&nmp->nm_mtx); 3707 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3708 (NFSHASPNFS(nmp) && (nmp->nm_privflag & NFSMNTP_IOADVISETHRUMDS) == 3709 0) || (nmp->nm_privflag & NFSMNTP_NOADVISE) != 0) { 3710 mtx_unlock(&nmp->nm_mtx); 3711 return (0); 3712 } 3713 mtx_unlock(&nmp->nm_mtx); 3714 error = nfsrpc_advise(ap->a_vp, ap->a_start, len, ap->a_advice, 3715 td->td_ucred, td); 3716 if (error == NFSERR_NOTSUPP) { 3717 mtx_lock(&nmp->nm_mtx); 3718 nmp->nm_privflag |= NFSMNTP_NOADVISE; 3719 mtx_unlock(&nmp->nm_mtx); 3720 } 3721 return (0); 3722 } 3723 3724 /* 3725 * nfs allocate call 3726 */ 3727 static int 3728 nfs_allocate(struct vop_allocate_args *ap) 3729 { 3730 struct vnode *vp = ap->a_vp; 3731 struct thread *td = curthread; 3732 struct nfsvattr nfsva; 3733 struct nfsmount *nmp; 3734 struct nfsnode *np; 3735 off_t alen; 3736 int attrflag, error, ret; 3737 struct timespec ts; 3738 struct uio io; 3739 3740 attrflag = 0; 3741 nmp = VFSTONFS(vp->v_mount); 3742 np = VTONFS(vp); 3743 mtx_lock(&nmp->nm_mtx); 3744 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION && 3745 (nmp->nm_privflag & NFSMNTP_NOALLOCATE) == 0) { 3746 mtx_unlock(&nmp->nm_mtx); 3747 alen = *ap->a_len; 3748 if ((uint64_t)alen > nfs_maxalloclen) 3749 alen = nfs_maxalloclen; 3750 3751 /* Check the file size limit. */ 3752 io.uio_offset = *ap->a_offset; 3753 io.uio_resid = alen; 3754 error = vn_rlimit_fsize(vp, &io, td); 3755 3756 /* 3757 * Flush first to ensure that the allocate adds to the 3758 * file's allocation on the server. 3759 */ 3760 if (error == 0) 3761 error = ncl_flush(vp, MNT_WAIT, td, 1, 0); 3762 if (error == 0) 3763 error = nfsrpc_allocate(vp, *ap->a_offset, alen, 3764 &nfsva, &attrflag, ap->a_cred, td, NULL); 3765 if (error == 0) { 3766 *ap->a_offset += alen; 3767 *ap->a_len -= alen; 3768 nanouptime(&ts); 3769 NFSLOCKNODE(np); 3770 np->n_localmodtime = ts; 3771 NFSUNLOCKNODE(np); 3772 } else if (error == NFSERR_NOTSUPP) { 3773 mtx_lock(&nmp->nm_mtx); 3774 nmp->nm_privflag |= NFSMNTP_NOALLOCATE; 3775 mtx_unlock(&nmp->nm_mtx); 3776 error = EINVAL; 3777 } 3778 } else { 3779 mtx_unlock(&nmp->nm_mtx); 3780 error = EINVAL; 3781 } 3782 if (attrflag != 0) { 3783 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 3784 if (error == 0 && ret != 0) 3785 error = ret; 3786 } 3787 if (error != 0) 3788 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 3789 return (error); 3790 } 3791 3792 /* 3793 * nfs copy_file_range call 3794 */ 3795 static int 3796 nfs_copy_file_range(struct vop_copy_file_range_args *ap) 3797 { 3798 struct vnode *invp = ap->a_invp; 3799 struct vnode *outvp = ap->a_outvp; 3800 struct mount *mp; 3801 struct nfsvattr innfsva, outnfsva; 3802 struct vattr *vap; 3803 struct uio io; 3804 struct nfsmount *nmp; 3805 size_t len, len2; 3806 ssize_t r; 3807 int error, inattrflag, outattrflag, ret, ret2; 3808 off_t inoff, outoff; 3809 bool consecutive, must_commit, tryoutcred; 3810 3811 /* NFSv4.2 Copy is not permitted for infile == outfile. */ 3812 if (invp == outvp) { 3813 generic_copy: 3814 return (vn_generic_copy_file_range(invp, ap->a_inoffp, 3815 outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, 3816 ap->a_incred, ap->a_outcred, ap->a_fsizetd)); 3817 } 3818 3819 /* Lock both vnodes, avoiding risk of deadlock. */ 3820 do { 3821 mp = NULL; 3822 error = vn_start_write(outvp, &mp, V_WAIT); 3823 if (error == 0) { 3824 error = vn_lock(outvp, LK_EXCLUSIVE); 3825 if (error == 0) { 3826 error = vn_lock(invp, LK_SHARED | LK_NOWAIT); 3827 if (error == 0) 3828 break; 3829 VOP_UNLOCK(outvp); 3830 if (mp != NULL) 3831 vn_finished_write(mp); 3832 mp = NULL; 3833 error = vn_lock(invp, LK_SHARED); 3834 if (error == 0) 3835 VOP_UNLOCK(invp); 3836 } 3837 } 3838 if (mp != NULL) 3839 vn_finished_write(mp); 3840 } while (error == 0); 3841 if (error != 0) 3842 return (error); 3843 3844 /* 3845 * More reasons to avoid nfs copy: not NFSv4.2, or explicitly 3846 * disabled. 3847 */ 3848 nmp = VFSTONFS(invp->v_mount); 3849 mtx_lock(&nmp->nm_mtx); 3850 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 3851 (nmp->nm_privflag & NFSMNTP_NOCOPY) != 0) { 3852 mtx_unlock(&nmp->nm_mtx); 3853 VOP_UNLOCK(invp); 3854 VOP_UNLOCK(outvp); 3855 if (mp != NULL) 3856 vn_finished_write(mp); 3857 goto generic_copy; 3858 } 3859 mtx_unlock(&nmp->nm_mtx); 3860 3861 /* 3862 * Do the vn_rlimit_fsize() check. Should this be above the VOP layer? 3863 */ 3864 io.uio_offset = *ap->a_outoffp; 3865 io.uio_resid = *ap->a_lenp; 3866 error = vn_rlimit_fsizex(outvp, &io, 0, &r, ap->a_fsizetd); 3867 *ap->a_lenp = io.uio_resid; 3868 /* 3869 * No need to call vn_rlimit_fsizex_res before return, since the uio is 3870 * local. 3871 */ 3872 3873 /* 3874 * Flush the input file so that the data is up to date before 3875 * the copy. Flush writes for the output file so that they 3876 * do not overwrite the data copied to the output file by the Copy. 3877 * Set the commit argument for both flushes so that the data is on 3878 * stable storage before the Copy RPC. This is done in case the 3879 * server reboots during the Copy and needs to be redone. 3880 */ 3881 if (error == 0) 3882 error = ncl_flush(invp, MNT_WAIT, curthread, 1, 0); 3883 if (error == 0) 3884 error = ncl_flush(outvp, MNT_WAIT, curthread, 1, 0); 3885 3886 /* Do the actual NFSv4.2 RPC. */ 3887 ret = ret2 = 0; 3888 len = *ap->a_lenp; 3889 mtx_lock(&nmp->nm_mtx); 3890 if ((nmp->nm_privflag & NFSMNTP_NOCONSECUTIVE) == 0) 3891 consecutive = true; 3892 else 3893 consecutive = false; 3894 mtx_unlock(&nmp->nm_mtx); 3895 inoff = *ap->a_inoffp; 3896 outoff = *ap->a_outoffp; 3897 tryoutcred = true; 3898 must_commit = false; 3899 if (error == 0) { 3900 vap = &VTONFS(invp)->n_vattr.na_vattr; 3901 error = VOP_GETATTR(invp, vap, ap->a_incred); 3902 if (error == 0) { 3903 /* 3904 * Clip "len" at va_size so that RFC compliant servers 3905 * will not reply NFSERR_INVAL. 3906 * Setting "len == 0" for the RPC would be preferred, 3907 * but some Linux servers do not support that. 3908 */ 3909 if (inoff >= vap->va_size) 3910 *ap->a_lenp = len = 0; 3911 else if (inoff + len > vap->va_size) 3912 *ap->a_lenp = len = vap->va_size - inoff; 3913 } else 3914 error = 0; 3915 } 3916 3917 /* 3918 * len will be set to 0 upon a successful Copy RPC. 3919 * As such, this only loops when the Copy RPC needs to be retried. 3920 */ 3921 while (len > 0 && error == 0) { 3922 inattrflag = outattrflag = 0; 3923 len2 = len; 3924 if (tryoutcred) 3925 error = nfsrpc_copy_file_range(invp, ap->a_inoffp, 3926 outvp, ap->a_outoffp, &len2, ap->a_flags, 3927 &inattrflag, &innfsva, &outattrflag, &outnfsva, 3928 ap->a_outcred, consecutive, &must_commit); 3929 else 3930 error = nfsrpc_copy_file_range(invp, ap->a_inoffp, 3931 outvp, ap->a_outoffp, &len2, ap->a_flags, 3932 &inattrflag, &innfsva, &outattrflag, &outnfsva, 3933 ap->a_incred, consecutive, &must_commit); 3934 if (inattrflag != 0) 3935 ret = nfscl_loadattrcache(&invp, &innfsva, NULL, NULL, 3936 0, 1); 3937 if (outattrflag != 0) 3938 ret2 = nfscl_loadattrcache(&outvp, &outnfsva, NULL, 3939 NULL, 1, 1); 3940 if (error == 0) { 3941 if (consecutive == false) { 3942 if (len2 == len) { 3943 mtx_lock(&nmp->nm_mtx); 3944 nmp->nm_privflag |= 3945 NFSMNTP_NOCONSECUTIVE; 3946 mtx_unlock(&nmp->nm_mtx); 3947 } else 3948 error = NFSERR_OFFLOADNOREQS; 3949 } 3950 *ap->a_lenp = len2; 3951 len = 0; 3952 if (len2 > 0 && must_commit && error == 0) 3953 error = ncl_commit(outvp, outoff, *ap->a_lenp, 3954 ap->a_outcred, curthread); 3955 if (error == 0 && ret != 0) 3956 error = ret; 3957 if (error == 0 && ret2 != 0) 3958 error = ret2; 3959 } else if (error == NFSERR_OFFLOADNOREQS && consecutive) { 3960 /* 3961 * Try consecutive == false, which is ok only if all 3962 * bytes are copied. 3963 * If only some bytes were copied when consecutive 3964 * is false, there is no way to know which bytes 3965 * still need to be written. 3966 */ 3967 consecutive = false; 3968 error = 0; 3969 } else if (error == NFSERR_ACCES && tryoutcred) { 3970 /* Try again with incred. */ 3971 tryoutcred = false; 3972 error = 0; 3973 } 3974 if (error == NFSERR_STALEWRITEVERF) { 3975 /* 3976 * Server rebooted, so do it all again. 3977 */ 3978 *ap->a_inoffp = inoff; 3979 *ap->a_outoffp = outoff; 3980 len = *ap->a_lenp; 3981 must_commit = false; 3982 error = 0; 3983 } 3984 } 3985 VOP_UNLOCK(invp); 3986 VOP_UNLOCK(outvp); 3987 if (mp != NULL) 3988 vn_finished_write(mp); 3989 if (error == NFSERR_NOTSUPP || error == NFSERR_OFFLOADNOREQS || 3990 error == NFSERR_ACCES) { 3991 /* 3992 * Unlike the NFSv4.2 Copy, vn_generic_copy_file_range() can 3993 * use a_incred for the read and a_outcred for the write, so 3994 * try this for NFSERR_ACCES failures for the Copy. 3995 * For NFSERR_NOTSUPP and NFSERR_OFFLOADNOREQS, the Copy can 3996 * never succeed, so disable it. 3997 */ 3998 if (error != NFSERR_ACCES) { 3999 /* Can never do Copy on this mount. */ 4000 mtx_lock(&nmp->nm_mtx); 4001 nmp->nm_privflag |= NFSMNTP_NOCOPY; 4002 mtx_unlock(&nmp->nm_mtx); 4003 } 4004 *ap->a_inoffp = inoff; 4005 *ap->a_outoffp = outoff; 4006 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 4007 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, 4008 ap->a_incred, ap->a_outcred, ap->a_fsizetd); 4009 } else if (error != 0) 4010 *ap->a_lenp = 0; 4011 4012 if (error != 0) 4013 error = nfscl_maperr(curthread, error, (uid_t)0, (gid_t)0); 4014 return (error); 4015 } 4016 4017 /* 4018 * nfs ioctl call 4019 */ 4020 static int 4021 nfs_ioctl(struct vop_ioctl_args *ap) 4022 { 4023 struct vnode *vp = ap->a_vp; 4024 struct nfsvattr nfsva; 4025 struct nfsmount *nmp; 4026 int attrflag, content, error, ret; 4027 bool eof = false; /* shut up compiler. */ 4028 4029 /* Do the actual NFSv4.2 RPC. */ 4030 switch (ap->a_command) { 4031 case FIOSEEKDATA: 4032 content = NFSV4CONTENT_DATA; 4033 break; 4034 case FIOSEEKHOLE: 4035 content = NFSV4CONTENT_HOLE; 4036 break; 4037 default: 4038 return (ENOTTY); 4039 } 4040 4041 error = vn_lock(vp, LK_SHARED); 4042 if (error != 0) 4043 return (EBADF); 4044 4045 if (vp->v_type != VREG) { 4046 VOP_UNLOCK(vp); 4047 return (ENOTTY); 4048 } 4049 nmp = VFSTONFS(vp->v_mount); 4050 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) { 4051 VOP_UNLOCK(vp); 4052 error = vop_stdioctl(ap); 4053 return (error); 4054 } 4055 4056 attrflag = 0; 4057 if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size) 4058 error = ENXIO; 4059 else { 4060 /* 4061 * Flush all writes, so that the server is up to date. 4062 * Although a Commit is not required, the commit argument 4063 * is set so that, for a pNFS File/Flexible File Layout 4064 * server, the LayoutCommit will be done to ensure the file 4065 * size is up to date on the Metadata Server. 4066 */ 4067 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0); 4068 if (error == 0) 4069 error = nfsrpc_seek(vp, (off_t *)ap->a_data, &eof, 4070 content, ap->a_cred, &nfsva, &attrflag); 4071 /* If at eof for FIOSEEKDATA, return ENXIO. */ 4072 if (eof && error == 0 && content == NFSV4CONTENT_DATA) 4073 error = ENXIO; 4074 } 4075 if (attrflag != 0) { 4076 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4077 if (error == 0 && ret != 0) 4078 error = ret; 4079 } 4080 NFSVOPUNLOCK(vp); 4081 4082 if (error != 0) 4083 error = ENXIO; 4084 return (error); 4085 } 4086 4087 /* 4088 * nfs getextattr call 4089 */ 4090 static int 4091 nfs_getextattr(struct vop_getextattr_args *ap) 4092 { 4093 struct vnode *vp = ap->a_vp; 4094 struct nfsmount *nmp; 4095 struct ucred *cred; 4096 struct thread *td = ap->a_td; 4097 struct nfsvattr nfsva; 4098 ssize_t len; 4099 int attrflag, error, ret; 4100 4101 nmp = VFSTONFS(vp->v_mount); 4102 mtx_lock(&nmp->nm_mtx); 4103 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4104 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4105 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4106 mtx_unlock(&nmp->nm_mtx); 4107 return (EOPNOTSUPP); 4108 } 4109 mtx_unlock(&nmp->nm_mtx); 4110 4111 cred = ap->a_cred; 4112 if (cred == NULL) 4113 cred = td->td_ucred; 4114 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4115 attrflag = 0; 4116 error = nfsrpc_getextattr(vp, ap->a_name, ap->a_uio, &len, &nfsva, 4117 &attrflag, cred, td); 4118 if (attrflag != 0) { 4119 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4120 if (error == 0 && ret != 0) 4121 error = ret; 4122 } 4123 if (error == 0 && ap->a_size != NULL) 4124 *ap->a_size = len; 4125 4126 switch (error) { 4127 case NFSERR_NOTSUPP: 4128 case NFSERR_OPILLEGAL: 4129 mtx_lock(&nmp->nm_mtx); 4130 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4131 mtx_unlock(&nmp->nm_mtx); 4132 error = EOPNOTSUPP; 4133 break; 4134 case NFSERR_NOXATTR: 4135 case NFSERR_XATTR2BIG: 4136 error = ENOATTR; 4137 break; 4138 default: 4139 error = nfscl_maperr(td, error, 0, 0); 4140 break; 4141 } 4142 return (error); 4143 } 4144 4145 /* 4146 * nfs setextattr call 4147 */ 4148 static int 4149 nfs_setextattr(struct vop_setextattr_args *ap) 4150 { 4151 struct vnode *vp = ap->a_vp; 4152 struct nfsmount *nmp; 4153 struct ucred *cred; 4154 struct thread *td = ap->a_td; 4155 struct nfsvattr nfsva; 4156 int attrflag, error, ret; 4157 4158 nmp = VFSTONFS(vp->v_mount); 4159 mtx_lock(&nmp->nm_mtx); 4160 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4161 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4162 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4163 mtx_unlock(&nmp->nm_mtx); 4164 return (EOPNOTSUPP); 4165 } 4166 mtx_unlock(&nmp->nm_mtx); 4167 4168 if (ap->a_uio->uio_resid < 0) 4169 return (EINVAL); 4170 cred = ap->a_cred; 4171 if (cred == NULL) 4172 cred = td->td_ucred; 4173 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4174 attrflag = 0; 4175 error = nfsrpc_setextattr(vp, ap->a_name, ap->a_uio, &nfsva, 4176 &attrflag, cred, td); 4177 if (attrflag != 0) { 4178 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4179 if (error == 0 && ret != 0) 4180 error = ret; 4181 } 4182 4183 switch (error) { 4184 case NFSERR_NOTSUPP: 4185 case NFSERR_OPILLEGAL: 4186 mtx_lock(&nmp->nm_mtx); 4187 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4188 mtx_unlock(&nmp->nm_mtx); 4189 error = EOPNOTSUPP; 4190 break; 4191 case NFSERR_NOXATTR: 4192 case NFSERR_XATTR2BIG: 4193 error = ENOATTR; 4194 break; 4195 default: 4196 error = nfscl_maperr(td, error, 0, 0); 4197 break; 4198 } 4199 return (error); 4200 } 4201 4202 /* 4203 * nfs listextattr call 4204 */ 4205 static int 4206 nfs_listextattr(struct vop_listextattr_args *ap) 4207 { 4208 struct vnode *vp = ap->a_vp; 4209 struct nfsmount *nmp; 4210 struct ucred *cred; 4211 struct thread *td = ap->a_td; 4212 struct nfsvattr nfsva; 4213 size_t len, len2; 4214 uint64_t cookie; 4215 int attrflag, error, ret; 4216 bool eof; 4217 4218 nmp = VFSTONFS(vp->v_mount); 4219 mtx_lock(&nmp->nm_mtx); 4220 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4221 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4222 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4223 mtx_unlock(&nmp->nm_mtx); 4224 return (EOPNOTSUPP); 4225 } 4226 mtx_unlock(&nmp->nm_mtx); 4227 4228 cred = ap->a_cred; 4229 if (cred == NULL) 4230 cred = td->td_ucred; 4231 4232 /* Loop around doing List Extended Attribute RPCs. */ 4233 eof = false; 4234 cookie = 0; 4235 len2 = 0; 4236 error = 0; 4237 while (!eof && error == 0) { 4238 len = nmp->nm_rsize; 4239 attrflag = 0; 4240 error = nfsrpc_listextattr(vp, &cookie, ap->a_uio, &len, &eof, 4241 &nfsva, &attrflag, cred, td); 4242 if (attrflag != 0) { 4243 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 4244 1); 4245 if (error == 0 && ret != 0) 4246 error = ret; 4247 } 4248 if (error == 0) { 4249 len2 += len; 4250 if (len2 > SSIZE_MAX) 4251 error = ENOATTR; 4252 } 4253 } 4254 if (error == 0 && ap->a_size != NULL) 4255 *ap->a_size = len2; 4256 4257 switch (error) { 4258 case NFSERR_NOTSUPP: 4259 case NFSERR_OPILLEGAL: 4260 mtx_lock(&nmp->nm_mtx); 4261 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4262 mtx_unlock(&nmp->nm_mtx); 4263 error = EOPNOTSUPP; 4264 break; 4265 case NFSERR_NOXATTR: 4266 case NFSERR_XATTR2BIG: 4267 error = ENOATTR; 4268 break; 4269 default: 4270 error = nfscl_maperr(td, error, 0, 0); 4271 break; 4272 } 4273 return (error); 4274 } 4275 4276 /* 4277 * nfs setextattr call 4278 */ 4279 static int 4280 nfs_deleteextattr(struct vop_deleteextattr_args *ap) 4281 { 4282 struct vnode *vp = ap->a_vp; 4283 struct nfsmount *nmp; 4284 struct nfsvattr nfsva; 4285 int attrflag, error, ret; 4286 4287 nmp = VFSTONFS(vp->v_mount); 4288 mtx_lock(&nmp->nm_mtx); 4289 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION || 4290 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 || 4291 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) { 4292 mtx_unlock(&nmp->nm_mtx); 4293 return (EOPNOTSUPP); 4294 } 4295 mtx_unlock(&nmp->nm_mtx); 4296 4297 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */ 4298 attrflag = 0; 4299 error = nfsrpc_rmextattr(vp, ap->a_name, &nfsva, &attrflag, ap->a_cred, 4300 ap->a_td); 4301 if (attrflag != 0) { 4302 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 4303 if (error == 0 && ret != 0) 4304 error = ret; 4305 } 4306 4307 switch (error) { 4308 case NFSERR_NOTSUPP: 4309 case NFSERR_OPILLEGAL: 4310 mtx_lock(&nmp->nm_mtx); 4311 nmp->nm_privflag |= NFSMNTP_NOXATTR; 4312 mtx_unlock(&nmp->nm_mtx); 4313 error = EOPNOTSUPP; 4314 break; 4315 case NFSERR_NOXATTR: 4316 case NFSERR_XATTR2BIG: 4317 error = ENOATTR; 4318 break; 4319 default: 4320 error = nfscl_maperr(ap->a_td, error, 0, 0); 4321 break; 4322 } 4323 return (error); 4324 } 4325 4326 /* 4327 * Return POSIX pathconf information applicable to nfs filesystems. 4328 */ 4329 static int 4330 nfs_pathconf(struct vop_pathconf_args *ap) 4331 { 4332 struct nfsv3_pathconf pc; 4333 struct nfsvattr nfsva; 4334 struct vnode *vp = ap->a_vp; 4335 struct nfsmount *nmp; 4336 struct thread *td = curthread; 4337 off_t off; 4338 bool eof; 4339 int attrflag, error; 4340 4341 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX || 4342 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED || 4343 ap->a_name == _PC_NO_TRUNC)) || 4344 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) { 4345 /* 4346 * Since only the above 4 a_names are returned by the NFSv3 4347 * Pathconf RPC, there is no point in doing it for others. 4348 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can 4349 * be used for _PC_NFS4_ACL as well. 4350 */ 4351 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva, 4352 &attrflag, NULL); 4353 if (attrflag != 0) 4354 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 4355 1); 4356 if (error != 0) 4357 return (error); 4358 } else { 4359 /* 4360 * For NFSv2 (or NFSv3 when not one of the above 4 a_names), 4361 * just fake them. 4362 */ 4363 pc.pc_linkmax = NFS_LINK_MAX; 4364 pc.pc_namemax = NFS_MAXNAMLEN; 4365 pc.pc_notrunc = 1; 4366 pc.pc_chownrestricted = 1; 4367 pc.pc_caseinsensitive = 0; 4368 pc.pc_casepreserving = 1; 4369 error = 0; 4370 } 4371 switch (ap->a_name) { 4372 case _PC_LINK_MAX: 4373 #ifdef _LP64 4374 *ap->a_retval = pc.pc_linkmax; 4375 #else 4376 *ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax); 4377 #endif 4378 break; 4379 case _PC_NAME_MAX: 4380 *ap->a_retval = pc.pc_namemax; 4381 break; 4382 case _PC_PIPE_BUF: 4383 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) 4384 *ap->a_retval = PIPE_BUF; 4385 else 4386 error = EINVAL; 4387 break; 4388 case _PC_CHOWN_RESTRICTED: 4389 *ap->a_retval = pc.pc_chownrestricted; 4390 break; 4391 case _PC_NO_TRUNC: 4392 *ap->a_retval = pc.pc_notrunc; 4393 break; 4394 case _PC_ACL_NFS4: 4395 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 && 4396 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL)) 4397 *ap->a_retval = 1; 4398 else 4399 *ap->a_retval = 0; 4400 break; 4401 case _PC_ACL_PATH_MAX: 4402 if (NFS_ISV4(vp)) 4403 *ap->a_retval = ACL_MAX_ENTRIES; 4404 else 4405 *ap->a_retval = 3; 4406 break; 4407 case _PC_PRIO_IO: 4408 *ap->a_retval = 0; 4409 break; 4410 case _PC_SYNC_IO: 4411 *ap->a_retval = 0; 4412 break; 4413 case _PC_ALLOC_SIZE_MIN: 4414 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize; 4415 break; 4416 case _PC_FILESIZEBITS: 4417 if (NFS_ISV34(vp)) 4418 *ap->a_retval = 64; 4419 else 4420 *ap->a_retval = 32; 4421 break; 4422 case _PC_REC_INCR_XFER_SIZE: 4423 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4424 break; 4425 case _PC_REC_MAX_XFER_SIZE: 4426 *ap->a_retval = -1; /* means ``unlimited'' */ 4427 break; 4428 case _PC_REC_MIN_XFER_SIZE: 4429 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4430 break; 4431 case _PC_REC_XFER_ALIGN: 4432 *ap->a_retval = PAGE_SIZE; 4433 break; 4434 case _PC_SYMLINK_MAX: 4435 *ap->a_retval = NFS_MAXPATHLEN; 4436 break; 4437 case _PC_MIN_HOLE_SIZE: 4438 /* Only some NFSv4.2 servers support Seek for Holes. */ 4439 *ap->a_retval = 0; 4440 nmp = VFSTONFS(vp->v_mount); 4441 if (NFS_ISV4(vp) && nmp->nm_minorvers == NFSV42_MINORVERSION) { 4442 /* 4443 * NFSv4.2 doesn't have an attribute for hole size, 4444 * so all we can do is see if the Seek operation is 4445 * supported and then use f_iosize as a "best guess". 4446 */ 4447 mtx_lock(&nmp->nm_mtx); 4448 if ((nmp->nm_privflag & NFSMNTP_SEEKTESTED) == 0) { 4449 mtx_unlock(&nmp->nm_mtx); 4450 off = 0; 4451 attrflag = 0; 4452 error = nfsrpc_seek(vp, &off, &eof, 4453 NFSV4CONTENT_HOLE, td->td_ucred, &nfsva, 4454 &attrflag); 4455 if (attrflag != 0) 4456 nfscl_loadattrcache(&vp, &nfsva, 4457 NULL, NULL, 0, 1); 4458 mtx_lock(&nmp->nm_mtx); 4459 if (error == NFSERR_NOTSUPP) 4460 nmp->nm_privflag |= NFSMNTP_SEEKTESTED; 4461 else 4462 nmp->nm_privflag |= NFSMNTP_SEEKTESTED | 4463 NFSMNTP_SEEK; 4464 error = 0; 4465 } 4466 if ((nmp->nm_privflag & NFSMNTP_SEEK) != 0) 4467 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 4468 mtx_unlock(&nmp->nm_mtx); 4469 } 4470 break; 4471 4472 default: 4473 error = vop_stdpathconf(ap); 4474 break; 4475 } 4476 return (error); 4477 }
Cache object: b75a57dfab65163b7a4ff3cd2423d185
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