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sys/fs/nfsclient/nfs_clvnops.c
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1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from nfs_vnops.c 8.16 (Berkeley) 5/27/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD: releng/11.1/sys/fs/nfsclient/nfs_clvnops.c 317577 2017-04-29 00:46:51Z rmacklem $"); 37 38 /* 39 * vnode op calls for Sun NFS version 2, 3 and 4 40 */ 41 42 #include "opt_inet.h" 43 44 #include <sys/param.h> 45 #include <sys/kernel.h> 46 #include <sys/systm.h> 47 #include <sys/resourcevar.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 #include <sys/bio.h> 51 #include <sys/buf.h> 52 #include <sys/jail.h> 53 #include <sys/malloc.h> 54 #include <sys/mbuf.h> 55 #include <sys/namei.h> 56 #include <sys/socket.h> 57 #include <sys/vnode.h> 58 #include <sys/dirent.h> 59 #include <sys/fcntl.h> 60 #include <sys/lockf.h> 61 #include <sys/stat.h> 62 #include <sys/sysctl.h> 63 #include <sys/signalvar.h> 64 65 #include <vm/vm.h> 66 #include <vm/vm_extern.h> 67 #include <vm/vm_object.h> 68 69 #include <fs/nfs/nfsport.h> 70 #include <fs/nfsclient/nfsnode.h> 71 #include <fs/nfsclient/nfsmount.h> 72 #include <fs/nfsclient/nfs.h> 73 #include <fs/nfsclient/nfs_kdtrace.h> 74 75 #include <net/if.h> 76 #include <netinet/in.h> 77 #include <netinet/in_var.h> 78 79 #include <nfs/nfs_lock.h> 80 81 #ifdef KDTRACE_HOOKS 82 #include <sys/dtrace_bsd.h> 83 84 dtrace_nfsclient_accesscache_flush_probe_func_t 85 dtrace_nfscl_accesscache_flush_done_probe; 86 uint32_t nfscl_accesscache_flush_done_id; 87 88 dtrace_nfsclient_accesscache_get_probe_func_t 89 dtrace_nfscl_accesscache_get_hit_probe, 90 dtrace_nfscl_accesscache_get_miss_probe; 91 uint32_t nfscl_accesscache_get_hit_id; 92 uint32_t nfscl_accesscache_get_miss_id; 93 94 dtrace_nfsclient_accesscache_load_probe_func_t 95 dtrace_nfscl_accesscache_load_done_probe; 96 uint32_t nfscl_accesscache_load_done_id; 97 #endif /* !KDTRACE_HOOKS */ 98 99 /* Defs */ 100 #define TRUE 1 101 #define FALSE 0 102 103 extern struct nfsstatsv1 nfsstatsv1; 104 extern int nfsrv_useacl; 105 extern int nfscl_debuglevel; 106 MALLOC_DECLARE(M_NEWNFSREQ); 107 108 static vop_read_t nfsfifo_read; 109 static vop_write_t nfsfifo_write; 110 static vop_close_t nfsfifo_close; 111 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *, 112 struct thread *); 113 static vop_lookup_t nfs_lookup; 114 static vop_create_t nfs_create; 115 static vop_mknod_t nfs_mknod; 116 static vop_open_t nfs_open; 117 static vop_pathconf_t nfs_pathconf; 118 static vop_close_t nfs_close; 119 static vop_access_t nfs_access; 120 static vop_getattr_t nfs_getattr; 121 static vop_setattr_t nfs_setattr; 122 static vop_read_t nfs_read; 123 static vop_fsync_t nfs_fsync; 124 static vop_remove_t nfs_remove; 125 static vop_link_t nfs_link; 126 static vop_rename_t nfs_rename; 127 static vop_mkdir_t nfs_mkdir; 128 static vop_rmdir_t nfs_rmdir; 129 static vop_symlink_t nfs_symlink; 130 static vop_readdir_t nfs_readdir; 131 static vop_strategy_t nfs_strategy; 132 static int nfs_lookitup(struct vnode *, char *, int, 133 struct ucred *, struct thread *, struct nfsnode **); 134 static int nfs_sillyrename(struct vnode *, struct vnode *, 135 struct componentname *); 136 static vop_access_t nfsspec_access; 137 static vop_readlink_t nfs_readlink; 138 static vop_print_t nfs_print; 139 static vop_advlock_t nfs_advlock; 140 static vop_advlockasync_t nfs_advlockasync; 141 static vop_getacl_t nfs_getacl; 142 static vop_setacl_t nfs_setacl; 143 static vop_set_text_t nfs_set_text; 144 145 /* 146 * Global vfs data structures for nfs 147 */ 148 struct vop_vector newnfs_vnodeops = { 149 .vop_default = &default_vnodeops, 150 .vop_access = nfs_access, 151 .vop_advlock = nfs_advlock, 152 .vop_advlockasync = nfs_advlockasync, 153 .vop_close = nfs_close, 154 .vop_create = nfs_create, 155 .vop_fsync = nfs_fsync, 156 .vop_getattr = nfs_getattr, 157 .vop_getpages = ncl_getpages, 158 .vop_putpages = ncl_putpages, 159 .vop_inactive = ncl_inactive, 160 .vop_link = nfs_link, 161 .vop_lookup = nfs_lookup, 162 .vop_mkdir = nfs_mkdir, 163 .vop_mknod = nfs_mknod, 164 .vop_open = nfs_open, 165 .vop_pathconf = nfs_pathconf, 166 .vop_print = nfs_print, 167 .vop_read = nfs_read, 168 .vop_readdir = nfs_readdir, 169 .vop_readlink = nfs_readlink, 170 .vop_reclaim = ncl_reclaim, 171 .vop_remove = nfs_remove, 172 .vop_rename = nfs_rename, 173 .vop_rmdir = nfs_rmdir, 174 .vop_setattr = nfs_setattr, 175 .vop_strategy = nfs_strategy, 176 .vop_symlink = nfs_symlink, 177 .vop_write = ncl_write, 178 .vop_getacl = nfs_getacl, 179 .vop_setacl = nfs_setacl, 180 .vop_set_text = nfs_set_text, 181 }; 182 183 struct vop_vector newnfs_fifoops = { 184 .vop_default = &fifo_specops, 185 .vop_access = nfsspec_access, 186 .vop_close = nfsfifo_close, 187 .vop_fsync = nfs_fsync, 188 .vop_getattr = nfs_getattr, 189 .vop_inactive = ncl_inactive, 190 .vop_print = nfs_print, 191 .vop_read = nfsfifo_read, 192 .vop_reclaim = ncl_reclaim, 193 .vop_setattr = nfs_setattr, 194 .vop_write = nfsfifo_write, 195 }; 196 197 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 198 struct componentname *cnp, struct vattr *vap); 199 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 200 int namelen, struct ucred *cred, struct thread *td); 201 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, 202 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp, 203 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td); 204 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp, 205 struct componentname *scnp, struct sillyrename *sp); 206 207 /* 208 * Global variables 209 */ 210 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1)) 211 212 SYSCTL_DECL(_vfs_nfs); 213 214 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 215 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 216 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 217 218 static int nfs_prime_access_cache = 0; 219 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW, 220 &nfs_prime_access_cache, 0, 221 "Prime NFS ACCESS cache when fetching attributes"); 222 223 static int newnfs_commit_on_close = 0; 224 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW, 225 &newnfs_commit_on_close, 0, "write+commit on close, else only write"); 226 227 static int nfs_clean_pages_on_close = 1; 228 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, 229 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); 230 231 int newnfs_directio_enable = 0; 232 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 233 &newnfs_directio_enable, 0, "Enable NFS directio"); 234 235 int nfs_keep_dirty_on_error; 236 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW, 237 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned"); 238 239 /* 240 * This sysctl allows other processes to mmap a file that has been opened 241 * O_DIRECT by a process. In general, having processes mmap the file while 242 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 243 * this by default to prevent DoS attacks - to prevent a malicious user from 244 * opening up files O_DIRECT preventing other users from mmap'ing these 245 * files. "Protected" environments where stricter consistency guarantees are 246 * required can disable this knob. The process that opened the file O_DIRECT 247 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 248 * meaningful. 249 */ 250 int newnfs_directio_allow_mmap = 1; 251 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 252 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 253 254 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \ 255 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \ 256 | NFSACCESS_DELETE | NFSACCESS_LOOKUP) 257 258 /* 259 * SMP Locking Note : 260 * The list of locks after the description of the lock is the ordering 261 * of other locks acquired with the lock held. 262 * np->n_mtx : Protects the fields in the nfsnode. 263 VM Object Lock 264 VI_MTX (acquired indirectly) 265 * nmp->nm_mtx : Protects the fields in the nfsmount. 266 rep->r_mtx 267 * ncl_iod_mutex : Global lock, protects shared nfsiod state. 268 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. 269 nmp->nm_mtx 270 rep->r_mtx 271 * rep->r_mtx : Protects the fields in an nfsreq. 272 */ 273 274 static int 275 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td, 276 struct ucred *cred, u_int32_t *retmode) 277 { 278 int error = 0, attrflag, i, lrupos; 279 u_int32_t rmode; 280 struct nfsnode *np = VTONFS(vp); 281 struct nfsvattr nfsva; 282 283 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag, 284 &rmode, NULL); 285 if (attrflag) 286 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 287 if (!error) { 288 lrupos = 0; 289 mtx_lock(&np->n_mtx); 290 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 291 if (np->n_accesscache[i].uid == cred->cr_uid) { 292 np->n_accesscache[i].mode = rmode; 293 np->n_accesscache[i].stamp = time_second; 294 break; 295 } 296 if (i > 0 && np->n_accesscache[i].stamp < 297 np->n_accesscache[lrupos].stamp) 298 lrupos = i; 299 } 300 if (i == NFS_ACCESSCACHESIZE) { 301 np->n_accesscache[lrupos].uid = cred->cr_uid; 302 np->n_accesscache[lrupos].mode = rmode; 303 np->n_accesscache[lrupos].stamp = time_second; 304 } 305 mtx_unlock(&np->n_mtx); 306 if (retmode != NULL) 307 *retmode = rmode; 308 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0); 309 } else if (NFS_ISV4(vp)) { 310 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 311 } 312 #ifdef KDTRACE_HOOKS 313 if (error != 0) 314 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0, 315 error); 316 #endif 317 return (error); 318 } 319 320 /* 321 * nfs access vnode op. 322 * For nfs version 2, just return ok. File accesses may fail later. 323 * For nfs version 3, use the access rpc to check accessibility. If file modes 324 * are changed on the server, accesses might still fail later. 325 */ 326 static int 327 nfs_access(struct vop_access_args *ap) 328 { 329 struct vnode *vp = ap->a_vp; 330 int error = 0, i, gotahit; 331 u_int32_t mode, wmode, rmode; 332 int v34 = NFS_ISV34(vp); 333 struct nfsnode *np = VTONFS(vp); 334 335 /* 336 * Disallow write attempts on filesystems mounted read-only; 337 * unless the file is a socket, fifo, or a block or character 338 * device resident on the filesystem. 339 */ 340 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS | 341 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL | 342 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { 343 switch (vp->v_type) { 344 case VREG: 345 case VDIR: 346 case VLNK: 347 return (EROFS); 348 default: 349 break; 350 } 351 } 352 /* 353 * For nfs v3 or v4, check to see if we have done this recently, and if 354 * so return our cached result instead of making an ACCESS call. 355 * If not, do an access rpc, otherwise you are stuck emulating 356 * ufs_access() locally using the vattr. This may not be correct, 357 * since the server may apply other access criteria such as 358 * client uid-->server uid mapping that we do not know about. 359 */ 360 if (v34) { 361 if (ap->a_accmode & VREAD) 362 mode = NFSACCESS_READ; 363 else 364 mode = 0; 365 if (vp->v_type != VDIR) { 366 if (ap->a_accmode & VWRITE) 367 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 368 if (ap->a_accmode & VAPPEND) 369 mode |= NFSACCESS_EXTEND; 370 if (ap->a_accmode & VEXEC) 371 mode |= NFSACCESS_EXECUTE; 372 if (ap->a_accmode & VDELETE) 373 mode |= NFSACCESS_DELETE; 374 } else { 375 if (ap->a_accmode & VWRITE) 376 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 377 if (ap->a_accmode & VAPPEND) 378 mode |= NFSACCESS_EXTEND; 379 if (ap->a_accmode & VEXEC) 380 mode |= NFSACCESS_LOOKUP; 381 if (ap->a_accmode & VDELETE) 382 mode |= NFSACCESS_DELETE; 383 if (ap->a_accmode & VDELETE_CHILD) 384 mode |= NFSACCESS_MODIFY; 385 } 386 /* XXX safety belt, only make blanket request if caching */ 387 if (nfsaccess_cache_timeout > 0) { 388 wmode = NFSACCESS_READ | NFSACCESS_MODIFY | 389 NFSACCESS_EXTEND | NFSACCESS_EXECUTE | 390 NFSACCESS_DELETE | NFSACCESS_LOOKUP; 391 } else { 392 wmode = mode; 393 } 394 395 /* 396 * Does our cached result allow us to give a definite yes to 397 * this request? 398 */ 399 gotahit = 0; 400 mtx_lock(&np->n_mtx); 401 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 402 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) { 403 if (time_second < (np->n_accesscache[i].stamp 404 + nfsaccess_cache_timeout) && 405 (np->n_accesscache[i].mode & mode) == mode) { 406 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits); 407 gotahit = 1; 408 } 409 break; 410 } 411 } 412 mtx_unlock(&np->n_mtx); 413 #ifdef KDTRACE_HOOKS 414 if (gotahit != 0) 415 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp, 416 ap->a_cred->cr_uid, mode); 417 else 418 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp, 419 ap->a_cred->cr_uid, mode); 420 #endif 421 if (gotahit == 0) { 422 /* 423 * Either a no, or a don't know. Go to the wire. 424 */ 425 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 426 error = nfs34_access_otw(vp, wmode, ap->a_td, 427 ap->a_cred, &rmode); 428 if (!error && 429 (rmode & mode) != mode) 430 error = EACCES; 431 } 432 return (error); 433 } else { 434 if ((error = nfsspec_access(ap)) != 0) { 435 return (error); 436 } 437 /* 438 * Attempt to prevent a mapped root from accessing a file 439 * which it shouldn't. We try to read a byte from the file 440 * if the user is root and the file is not zero length. 441 * After calling nfsspec_access, we should have the correct 442 * file size cached. 443 */ 444 mtx_lock(&np->n_mtx); 445 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD) 446 && VTONFS(vp)->n_size > 0) { 447 struct iovec aiov; 448 struct uio auio; 449 char buf[1]; 450 451 mtx_unlock(&np->n_mtx); 452 aiov.iov_base = buf; 453 aiov.iov_len = 1; 454 auio.uio_iov = &aiov; 455 auio.uio_iovcnt = 1; 456 auio.uio_offset = 0; 457 auio.uio_resid = 1; 458 auio.uio_segflg = UIO_SYSSPACE; 459 auio.uio_rw = UIO_READ; 460 auio.uio_td = ap->a_td; 461 462 if (vp->v_type == VREG) 463 error = ncl_readrpc(vp, &auio, ap->a_cred); 464 else if (vp->v_type == VDIR) { 465 char* bp; 466 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 467 aiov.iov_base = bp; 468 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 469 error = ncl_readdirrpc(vp, &auio, ap->a_cred, 470 ap->a_td); 471 free(bp, M_TEMP); 472 } else if (vp->v_type == VLNK) 473 error = ncl_readlinkrpc(vp, &auio, ap->a_cred); 474 else 475 error = EACCES; 476 } else 477 mtx_unlock(&np->n_mtx); 478 return (error); 479 } 480 } 481 482 483 /* 484 * nfs open vnode op 485 * Check to see if the type is ok 486 * and that deletion is not in progress. 487 * For paged in text files, you will need to flush the page cache 488 * if consistency is lost. 489 */ 490 /* ARGSUSED */ 491 static int 492 nfs_open(struct vop_open_args *ap) 493 { 494 struct vnode *vp = ap->a_vp; 495 struct nfsnode *np = VTONFS(vp); 496 struct vattr vattr; 497 int error; 498 int fmode = ap->a_mode; 499 struct ucred *cred; 500 501 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 502 return (EOPNOTSUPP); 503 504 /* 505 * For NFSv4, we need to do the Open Op before cache validation, 506 * so that we conform to RFC3530 Sec. 9.3.1. 507 */ 508 if (NFS_ISV4(vp)) { 509 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td); 510 if (error) { 511 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 512 (gid_t)0); 513 return (error); 514 } 515 } 516 517 /* 518 * Now, if this Open will be doing reading, re-validate/flush the 519 * cache, so that Close/Open coherency is maintained. 520 */ 521 mtx_lock(&np->n_mtx); 522 if (np->n_flag & NMODIFIED) { 523 mtx_unlock(&np->n_mtx); 524 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 525 if (error == 0 && (vp->v_iflag & VI_DOOMED) != 0) 526 return (EBADF); 527 if (error == EINTR || error == EIO) { 528 if (NFS_ISV4(vp)) 529 (void) nfsrpc_close(vp, 0, ap->a_td); 530 return (error); 531 } 532 mtx_lock(&np->n_mtx); 533 np->n_attrstamp = 0; 534 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 535 if (vp->v_type == VDIR) 536 np->n_direofoffset = 0; 537 mtx_unlock(&np->n_mtx); 538 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 539 if (error) { 540 if (NFS_ISV4(vp)) 541 (void) nfsrpc_close(vp, 0, ap->a_td); 542 return (error); 543 } 544 mtx_lock(&np->n_mtx); 545 np->n_mtime = vattr.va_mtime; 546 if (NFS_ISV4(vp)) 547 np->n_change = vattr.va_filerev; 548 } else { 549 mtx_unlock(&np->n_mtx); 550 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 551 if (error) { 552 if (NFS_ISV4(vp)) 553 (void) nfsrpc_close(vp, 0, ap->a_td); 554 return (error); 555 } 556 mtx_lock(&np->n_mtx); 557 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) || 558 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 559 if (vp->v_type == VDIR) 560 np->n_direofoffset = 0; 561 mtx_unlock(&np->n_mtx); 562 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 563 if (error == 0 && (vp->v_iflag & VI_DOOMED) != 0) 564 return (EBADF); 565 if (error == EINTR || error == EIO) { 566 if (NFS_ISV4(vp)) 567 (void) nfsrpc_close(vp, 0, ap->a_td); 568 return (error); 569 } 570 mtx_lock(&np->n_mtx); 571 np->n_mtime = vattr.va_mtime; 572 if (NFS_ISV4(vp)) 573 np->n_change = vattr.va_filerev; 574 } 575 } 576 577 /* 578 * If the object has >= 1 O_DIRECT active opens, we disable caching. 579 */ 580 if (newnfs_directio_enable && (fmode & O_DIRECT) && 581 (vp->v_type == VREG)) { 582 if (np->n_directio_opens == 0) { 583 mtx_unlock(&np->n_mtx); 584 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 585 if (error == 0 && (vp->v_iflag & VI_DOOMED) != 0) 586 return (EBADF); 587 if (error) { 588 if (NFS_ISV4(vp)) 589 (void) nfsrpc_close(vp, 0, ap->a_td); 590 return (error); 591 } 592 mtx_lock(&np->n_mtx); 593 np->n_flag |= NNONCACHE; 594 } 595 np->n_directio_opens++; 596 } 597 598 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */ 599 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0) 600 np->n_flag |= NWRITEOPENED; 601 602 /* 603 * If this is an open for writing, capture a reference to the 604 * credentials, so they can be used by ncl_putpages(). Using 605 * these write credentials is preferable to the credentials of 606 * whatever thread happens to be doing the VOP_PUTPAGES() since 607 * the write RPCs are less likely to fail with EACCES. 608 */ 609 if ((fmode & FWRITE) != 0) { 610 cred = np->n_writecred; 611 np->n_writecred = crhold(ap->a_cred); 612 } else 613 cred = NULL; 614 mtx_unlock(&np->n_mtx); 615 616 if (cred != NULL) 617 crfree(cred); 618 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 619 return (0); 620 } 621 622 /* 623 * nfs close vnode op 624 * What an NFS client should do upon close after writing is a debatable issue. 625 * Most NFS clients push delayed writes to the server upon close, basically for 626 * two reasons: 627 * 1 - So that any write errors may be reported back to the client process 628 * doing the close system call. By far the two most likely errors are 629 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 630 * 2 - To put a worst case upper bound on cache inconsistency between 631 * multiple clients for the file. 632 * There is also a consistency problem for Version 2 of the protocol w.r.t. 633 * not being able to tell if other clients are writing a file concurrently, 634 * since there is no way of knowing if the changed modify time in the reply 635 * is only due to the write for this client. 636 * (NFS Version 3 provides weak cache consistency data in the reply that 637 * should be sufficient to detect and handle this case.) 638 * 639 * The current code does the following: 640 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 641 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 642 * or commit them (this satisfies 1 and 2 except for the 643 * case where the server crashes after this close but 644 * before the commit RPC, which is felt to be "good 645 * enough". Changing the last argument to ncl_flush() to 646 * a 1 would force a commit operation, if it is felt a 647 * commit is necessary now. 648 * for NFS Version 4 - flush the dirty buffers and commit them, if 649 * nfscl_mustflush() says this is necessary. 650 * It is necessary if there is no write delegation held, 651 * in order to satisfy open/close coherency. 652 * If the file isn't cached on local stable storage, 653 * it may be necessary in order to detect "out of space" 654 * errors from the server, if the write delegation 655 * issued by the server doesn't allow the file to grow. 656 */ 657 /* ARGSUSED */ 658 static int 659 nfs_close(struct vop_close_args *ap) 660 { 661 struct vnode *vp = ap->a_vp; 662 struct nfsnode *np = VTONFS(vp); 663 struct nfsvattr nfsva; 664 struct ucred *cred; 665 int error = 0, ret, localcred = 0; 666 int fmode = ap->a_fflag; 667 668 if ((vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF)) 669 return (0); 670 /* 671 * During shutdown, a_cred isn't valid, so just use root. 672 */ 673 if (ap->a_cred == NOCRED) { 674 cred = newnfs_getcred(); 675 localcred = 1; 676 } else { 677 cred = ap->a_cred; 678 } 679 if (vp->v_type == VREG) { 680 /* 681 * Examine and clean dirty pages, regardless of NMODIFIED. 682 * This closes a major hole in close-to-open consistency. 683 * We want to push out all dirty pages (and buffers) on 684 * close, regardless of whether they were dirtied by 685 * mmap'ed writes or via write(). 686 */ 687 if (nfs_clean_pages_on_close && vp->v_object) { 688 VM_OBJECT_WLOCK(vp->v_object); 689 vm_object_page_clean(vp->v_object, 0, 0, 0); 690 VM_OBJECT_WUNLOCK(vp->v_object); 691 } 692 mtx_lock(&np->n_mtx); 693 if (np->n_flag & NMODIFIED) { 694 mtx_unlock(&np->n_mtx); 695 if (NFS_ISV3(vp)) { 696 /* 697 * Under NFSv3 we have dirty buffers to dispose of. We 698 * must flush them to the NFS server. We have the option 699 * of waiting all the way through the commit rpc or just 700 * waiting for the initial write. The default is to only 701 * wait through the initial write so the data is in the 702 * server's cache, which is roughly similar to the state 703 * a standard disk subsystem leaves the file in on close(). 704 * 705 * We cannot clear the NMODIFIED bit in np->n_flag due to 706 * potential races with other processes, and certainly 707 * cannot clear it if we don't commit. 708 * These races occur when there is no longer the old 709 * traditional vnode locking implemented for Vnode Ops. 710 */ 711 int cm = newnfs_commit_on_close ? 1 : 0; 712 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0); 713 /* np->n_flag &= ~NMODIFIED; */ 714 } else if (NFS_ISV4(vp)) { 715 if (nfscl_mustflush(vp) != 0) { 716 int cm = newnfs_commit_on_close ? 1 : 0; 717 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 718 cm, 0); 719 /* 720 * as above w.r.t races when clearing 721 * NMODIFIED. 722 * np->n_flag &= ~NMODIFIED; 723 */ 724 } 725 } else { 726 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 727 if (error == 0 && (vp->v_iflag & VI_DOOMED) != 0) 728 return (EBADF); 729 } 730 mtx_lock(&np->n_mtx); 731 } 732 /* 733 * Invalidate the attribute cache in all cases. 734 * An open is going to fetch fresh attrs any way, other procs 735 * on this node that have file open will be forced to do an 736 * otw attr fetch, but this is safe. 737 * --> A user found that their RPC count dropped by 20% when 738 * this was commented out and I can't see any requirement 739 * for it, so I've disabled it when negative lookups are 740 * enabled. (What does this have to do with negative lookup 741 * caching? Well nothing, except it was reported by the 742 * same user that needed negative lookup caching and I wanted 743 * there to be a way to disable it to see if it 744 * is the cause of some caching/coherency issue that might 745 * crop up.) 746 */ 747 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) { 748 np->n_attrstamp = 0; 749 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 750 } 751 if (np->n_flag & NWRITEERR) { 752 np->n_flag &= ~NWRITEERR; 753 error = np->n_error; 754 } 755 mtx_unlock(&np->n_mtx); 756 } 757 758 if (NFS_ISV4(vp)) { 759 /* 760 * Get attributes so "change" is up to date. 761 */ 762 if (error == 0 && nfscl_mustflush(vp) != 0 && 763 vp->v_type == VREG && 764 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) { 765 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva, 766 NULL); 767 if (!ret) { 768 np->n_change = nfsva.na_filerev; 769 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 770 NULL, 0, 0); 771 } 772 } 773 774 /* 775 * and do the close. 776 */ 777 ret = nfsrpc_close(vp, 0, ap->a_td); 778 if (!error && ret) 779 error = ret; 780 if (error) 781 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 782 (gid_t)0); 783 } 784 if (newnfs_directio_enable) 785 KASSERT((np->n_directio_asyncwr == 0), 786 ("nfs_close: dirty unflushed (%d) directio buffers\n", 787 np->n_directio_asyncwr)); 788 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 789 mtx_lock(&np->n_mtx); 790 KASSERT((np->n_directio_opens > 0), 791 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 792 np->n_directio_opens--; 793 if (np->n_directio_opens == 0) 794 np->n_flag &= ~NNONCACHE; 795 mtx_unlock(&np->n_mtx); 796 } 797 if (localcred) 798 NFSFREECRED(cred); 799 return (error); 800 } 801 802 /* 803 * nfs getattr call from vfs. 804 */ 805 static int 806 nfs_getattr(struct vop_getattr_args *ap) 807 { 808 struct vnode *vp = ap->a_vp; 809 struct thread *td = curthread; /* XXX */ 810 struct nfsnode *np = VTONFS(vp); 811 int error = 0; 812 struct nfsvattr nfsva; 813 struct vattr *vap = ap->a_vap; 814 struct vattr vattr; 815 816 /* 817 * Update local times for special files. 818 */ 819 mtx_lock(&np->n_mtx); 820 if (np->n_flag & (NACC | NUPD)) 821 np->n_flag |= NCHG; 822 mtx_unlock(&np->n_mtx); 823 /* 824 * First look in the cache. 825 */ 826 if (ncl_getattrcache(vp, &vattr) == 0) { 827 vap->va_type = vattr.va_type; 828 vap->va_mode = vattr.va_mode; 829 vap->va_nlink = vattr.va_nlink; 830 vap->va_uid = vattr.va_uid; 831 vap->va_gid = vattr.va_gid; 832 vap->va_fsid = vattr.va_fsid; 833 vap->va_fileid = vattr.va_fileid; 834 vap->va_size = vattr.va_size; 835 vap->va_blocksize = vattr.va_blocksize; 836 vap->va_atime = vattr.va_atime; 837 vap->va_mtime = vattr.va_mtime; 838 vap->va_ctime = vattr.va_ctime; 839 vap->va_gen = vattr.va_gen; 840 vap->va_flags = vattr.va_flags; 841 vap->va_rdev = vattr.va_rdev; 842 vap->va_bytes = vattr.va_bytes; 843 vap->va_filerev = vattr.va_filerev; 844 /* 845 * Get the local modify time for the case of a write 846 * delegation. 847 */ 848 nfscl_deleggetmodtime(vp, &vap->va_mtime); 849 return (0); 850 } 851 852 if (NFS_ISV34(vp) && nfs_prime_access_cache && 853 nfsaccess_cache_timeout > 0) { 854 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses); 855 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL); 856 if (ncl_getattrcache(vp, ap->a_vap) == 0) { 857 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime); 858 return (0); 859 } 860 } 861 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL); 862 if (!error) 863 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0); 864 if (!error) { 865 /* 866 * Get the local modify time for the case of a write 867 * delegation. 868 */ 869 nfscl_deleggetmodtime(vp, &vap->va_mtime); 870 } else if (NFS_ISV4(vp)) { 871 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 872 } 873 return (error); 874 } 875 876 /* 877 * nfs setattr call. 878 */ 879 static int 880 nfs_setattr(struct vop_setattr_args *ap) 881 { 882 struct vnode *vp = ap->a_vp; 883 struct nfsnode *np = VTONFS(vp); 884 struct thread *td = curthread; /* XXX */ 885 struct vattr *vap = ap->a_vap; 886 int error = 0; 887 u_quad_t tsize; 888 889 #ifndef nolint 890 tsize = (u_quad_t)0; 891 #endif 892 893 /* 894 * Setting of flags and marking of atimes are not supported. 895 */ 896 if (vap->va_flags != VNOVAL) 897 return (EOPNOTSUPP); 898 899 /* 900 * Disallow write attempts if the filesystem is mounted read-only. 901 */ 902 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 903 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 904 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 905 (vp->v_mount->mnt_flag & MNT_RDONLY)) 906 return (EROFS); 907 if (vap->va_size != VNOVAL) { 908 switch (vp->v_type) { 909 case VDIR: 910 return (EISDIR); 911 case VCHR: 912 case VBLK: 913 case VSOCK: 914 case VFIFO: 915 if (vap->va_mtime.tv_sec == VNOVAL && 916 vap->va_atime.tv_sec == VNOVAL && 917 vap->va_mode == (mode_t)VNOVAL && 918 vap->va_uid == (uid_t)VNOVAL && 919 vap->va_gid == (gid_t)VNOVAL) 920 return (0); 921 vap->va_size = VNOVAL; 922 break; 923 default: 924 /* 925 * Disallow write attempts if the filesystem is 926 * mounted read-only. 927 */ 928 if (vp->v_mount->mnt_flag & MNT_RDONLY) 929 return (EROFS); 930 /* 931 * We run vnode_pager_setsize() early (why?), 932 * we must set np->n_size now to avoid vinvalbuf 933 * V_SAVE races that might setsize a lower 934 * value. 935 */ 936 mtx_lock(&np->n_mtx); 937 tsize = np->n_size; 938 mtx_unlock(&np->n_mtx); 939 error = ncl_meta_setsize(vp, ap->a_cred, td, 940 vap->va_size); 941 mtx_lock(&np->n_mtx); 942 if (np->n_flag & NMODIFIED) { 943 tsize = np->n_size; 944 mtx_unlock(&np->n_mtx); 945 error = ncl_vinvalbuf(vp, vap->va_size == 0 ? 946 0 : V_SAVE, td, 1); 947 if (error == 0 && (vp->v_iflag & VI_DOOMED) != 0) 948 error = EBADF; 949 if (error != 0) { 950 vnode_pager_setsize(vp, tsize); 951 return (error); 952 } 953 /* 954 * Call nfscl_delegmodtime() to set the modify time 955 * locally, as required. 956 */ 957 nfscl_delegmodtime(vp); 958 } else 959 mtx_unlock(&np->n_mtx); 960 /* 961 * np->n_size has already been set to vap->va_size 962 * in ncl_meta_setsize(). We must set it again since 963 * nfs_loadattrcache() could be called through 964 * ncl_meta_setsize() and could modify np->n_size. 965 */ 966 mtx_lock(&np->n_mtx); 967 np->n_vattr.na_size = np->n_size = vap->va_size; 968 mtx_unlock(&np->n_mtx); 969 } 970 } else { 971 mtx_lock(&np->n_mtx); 972 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 973 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 974 mtx_unlock(&np->n_mtx); 975 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 976 if (error == 0 && (vp->v_iflag & VI_DOOMED) != 0) 977 return (EBADF); 978 if (error == EINTR || error == EIO) 979 return (error); 980 } else 981 mtx_unlock(&np->n_mtx); 982 } 983 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 984 if (error && vap->va_size != VNOVAL) { 985 mtx_lock(&np->n_mtx); 986 np->n_size = np->n_vattr.na_size = tsize; 987 vnode_pager_setsize(vp, tsize); 988 mtx_unlock(&np->n_mtx); 989 } 990 return (error); 991 } 992 993 /* 994 * Do an nfs setattr rpc. 995 */ 996 static int 997 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 998 struct thread *td) 999 { 1000 struct nfsnode *np = VTONFS(vp); 1001 int error, ret, attrflag, i; 1002 struct nfsvattr nfsva; 1003 1004 if (NFS_ISV34(vp)) { 1005 mtx_lock(&np->n_mtx); 1006 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) 1007 np->n_accesscache[i].stamp = 0; 1008 np->n_flag |= NDELEGMOD; 1009 mtx_unlock(&np->n_mtx); 1010 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); 1011 } 1012 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag, 1013 NULL); 1014 if (attrflag) { 1015 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1016 if (ret && !error) 1017 error = ret; 1018 } 1019 if (error && NFS_ISV4(vp)) 1020 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid); 1021 return (error); 1022 } 1023 1024 /* 1025 * nfs lookup call, one step at a time... 1026 * First look in cache 1027 * If not found, unlock the directory nfsnode and do the rpc 1028 */ 1029 static int 1030 nfs_lookup(struct vop_lookup_args *ap) 1031 { 1032 struct componentname *cnp = ap->a_cnp; 1033 struct vnode *dvp = ap->a_dvp; 1034 struct vnode **vpp = ap->a_vpp; 1035 struct mount *mp = dvp->v_mount; 1036 int flags = cnp->cn_flags; 1037 struct vnode *newvp; 1038 struct nfsmount *nmp; 1039 struct nfsnode *np, *newnp; 1040 int error = 0, attrflag, dattrflag, ltype, ncticks; 1041 struct thread *td = cnp->cn_thread; 1042 struct nfsfh *nfhp; 1043 struct nfsvattr dnfsva, nfsva; 1044 struct vattr vattr; 1045 struct timespec nctime; 1046 1047 *vpp = NULLVP; 1048 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) && 1049 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 1050 return (EROFS); 1051 if (dvp->v_type != VDIR) 1052 return (ENOTDIR); 1053 nmp = VFSTONFS(mp); 1054 np = VTONFS(dvp); 1055 1056 /* For NFSv4, wait until any remove is done. */ 1057 mtx_lock(&np->n_mtx); 1058 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) { 1059 np->n_flag |= NREMOVEWANT; 1060 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0); 1061 } 1062 mtx_unlock(&np->n_mtx); 1063 1064 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) 1065 return (error); 1066 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks); 1067 if (error > 0 && error != ENOENT) 1068 return (error); 1069 if (error == -1) { 1070 /* 1071 * Lookups of "." are special and always return the 1072 * current directory. cache_lookup() already handles 1073 * associated locking bookkeeping, etc. 1074 */ 1075 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 1076 /* XXX: Is this really correct? */ 1077 if (cnp->cn_nameiop != LOOKUP && 1078 (flags & ISLASTCN)) 1079 cnp->cn_flags |= SAVENAME; 1080 return (0); 1081 } 1082 1083 /* 1084 * We only accept a positive hit in the cache if the 1085 * change time of the file matches our cached copy. 1086 * Otherwise, we discard the cache entry and fallback 1087 * to doing a lookup RPC. We also only trust cache 1088 * entries for less than nm_nametimeo seconds. 1089 * 1090 * To better handle stale file handles and attributes, 1091 * clear the attribute cache of this node if it is a 1092 * leaf component, part of an open() call, and not 1093 * locally modified before fetching the attributes. 1094 * This should allow stale file handles to be detected 1095 * here where we can fall back to a LOOKUP RPC to 1096 * recover rather than having nfs_open() detect the 1097 * stale file handle and failing open(2) with ESTALE. 1098 */ 1099 newvp = *vpp; 1100 newnp = VTONFS(newvp); 1101 if (!(nmp->nm_flag & NFSMNT_NOCTO) && 1102 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1103 !(newnp->n_flag & NMODIFIED)) { 1104 mtx_lock(&newnp->n_mtx); 1105 newnp->n_attrstamp = 0; 1106 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1107 mtx_unlock(&newnp->n_mtx); 1108 } 1109 if (nfscl_nodeleg(newvp, 0) == 0 || 1110 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) && 1111 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 && 1112 timespeccmp(&vattr.va_ctime, &nctime, ==))) { 1113 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1114 if (cnp->cn_nameiop != LOOKUP && 1115 (flags & ISLASTCN)) 1116 cnp->cn_flags |= SAVENAME; 1117 return (0); 1118 } 1119 cache_purge(newvp); 1120 if (dvp != newvp) 1121 vput(newvp); 1122 else 1123 vrele(newvp); 1124 *vpp = NULLVP; 1125 } else if (error == ENOENT) { 1126 if (dvp->v_iflag & VI_DOOMED) 1127 return (ENOENT); 1128 /* 1129 * We only accept a negative hit in the cache if the 1130 * modification time of the parent directory matches 1131 * the cached copy in the name cache entry. 1132 * Otherwise, we discard all of the negative cache 1133 * entries for this directory. We also only trust 1134 * negative cache entries for up to nm_negnametimeo 1135 * seconds. 1136 */ 1137 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) && 1138 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && 1139 timespeccmp(&vattr.va_mtime, &nctime, ==)) { 1140 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits); 1141 return (ENOENT); 1142 } 1143 cache_purge_negative(dvp); 1144 } 1145 1146 error = 0; 1147 newvp = NULLVP; 1148 NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses); 1149 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1150 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1151 NULL); 1152 if (dattrflag) 1153 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1154 if (error) { 1155 if (newvp != NULLVP) { 1156 vput(newvp); 1157 *vpp = NULLVP; 1158 } 1159 1160 if (error != ENOENT) { 1161 if (NFS_ISV4(dvp)) 1162 error = nfscl_maperr(td, error, (uid_t)0, 1163 (gid_t)0); 1164 return (error); 1165 } 1166 1167 /* The requested file was not found. */ 1168 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1169 (flags & ISLASTCN)) { 1170 /* 1171 * XXX: UFS does a full VOP_ACCESS(dvp, 1172 * VWRITE) here instead of just checking 1173 * MNT_RDONLY. 1174 */ 1175 if (mp->mnt_flag & MNT_RDONLY) 1176 return (EROFS); 1177 cnp->cn_flags |= SAVENAME; 1178 return (EJUSTRETURN); 1179 } 1180 1181 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) { 1182 /* 1183 * Cache the modification time of the parent 1184 * directory from the post-op attributes in 1185 * the name cache entry. The negative cache 1186 * entry will be ignored once the directory 1187 * has changed. Don't bother adding the entry 1188 * if the directory has already changed. 1189 */ 1190 mtx_lock(&np->n_mtx); 1191 if (timespeccmp(&np->n_vattr.na_mtime, 1192 &dnfsva.na_mtime, ==)) { 1193 mtx_unlock(&np->n_mtx); 1194 cache_enter_time(dvp, NULL, cnp, 1195 &dnfsva.na_mtime, NULL); 1196 } else 1197 mtx_unlock(&np->n_mtx); 1198 } 1199 return (ENOENT); 1200 } 1201 1202 /* 1203 * Handle RENAME case... 1204 */ 1205 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 1206 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1207 FREE((caddr_t)nfhp, M_NFSFH); 1208 return (EISDIR); 1209 } 1210 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1211 LK_EXCLUSIVE); 1212 if (error) 1213 return (error); 1214 newvp = NFSTOV(np); 1215 if (attrflag) 1216 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1217 0, 1); 1218 *vpp = newvp; 1219 cnp->cn_flags |= SAVENAME; 1220 return (0); 1221 } 1222 1223 if (flags & ISDOTDOT) { 1224 ltype = NFSVOPISLOCKED(dvp); 1225 error = vfs_busy(mp, MBF_NOWAIT); 1226 if (error != 0) { 1227 vfs_ref(mp); 1228 NFSVOPUNLOCK(dvp, 0); 1229 error = vfs_busy(mp, 0); 1230 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1231 vfs_rel(mp); 1232 if (error == 0 && (dvp->v_iflag & VI_DOOMED)) { 1233 vfs_unbusy(mp); 1234 error = ENOENT; 1235 } 1236 if (error != 0) 1237 return (error); 1238 } 1239 NFSVOPUNLOCK(dvp, 0); 1240 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1241 cnp->cn_lkflags); 1242 if (error == 0) 1243 newvp = NFSTOV(np); 1244 vfs_unbusy(mp); 1245 if (newvp != dvp) 1246 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1247 if (dvp->v_iflag & VI_DOOMED) { 1248 if (error == 0) { 1249 if (newvp == dvp) 1250 vrele(newvp); 1251 else 1252 vput(newvp); 1253 } 1254 error = ENOENT; 1255 } 1256 if (error != 0) 1257 return (error); 1258 if (attrflag) 1259 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1260 0, 1); 1261 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1262 FREE((caddr_t)nfhp, M_NFSFH); 1263 VREF(dvp); 1264 newvp = dvp; 1265 if (attrflag) 1266 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1267 0, 1); 1268 } else { 1269 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1270 cnp->cn_lkflags); 1271 if (error) 1272 return (error); 1273 newvp = NFSTOV(np); 1274 if (attrflag) 1275 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1276 0, 1); 1277 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1278 !(np->n_flag & NMODIFIED)) { 1279 /* 1280 * Flush the attribute cache when opening a 1281 * leaf node to ensure that fresh attributes 1282 * are fetched in nfs_open() since we did not 1283 * fetch attributes from the LOOKUP reply. 1284 */ 1285 mtx_lock(&np->n_mtx); 1286 np->n_attrstamp = 0; 1287 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1288 mtx_unlock(&np->n_mtx); 1289 } 1290 } 1291 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1292 cnp->cn_flags |= SAVENAME; 1293 if ((cnp->cn_flags & MAKEENTRY) && 1294 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) && 1295 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0)) 1296 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 1297 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime); 1298 *vpp = newvp; 1299 return (0); 1300 } 1301 1302 /* 1303 * nfs read call. 1304 * Just call ncl_bioread() to do the work. 1305 */ 1306 static int 1307 nfs_read(struct vop_read_args *ap) 1308 { 1309 struct vnode *vp = ap->a_vp; 1310 1311 switch (vp->v_type) { 1312 case VREG: 1313 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1314 case VDIR: 1315 return (EISDIR); 1316 default: 1317 return (EOPNOTSUPP); 1318 } 1319 } 1320 1321 /* 1322 * nfs readlink call 1323 */ 1324 static int 1325 nfs_readlink(struct vop_readlink_args *ap) 1326 { 1327 struct vnode *vp = ap->a_vp; 1328 1329 if (vp->v_type != VLNK) 1330 return (EINVAL); 1331 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1332 } 1333 1334 /* 1335 * Do a readlink rpc. 1336 * Called by ncl_doio() from below the buffer cache. 1337 */ 1338 int 1339 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1340 { 1341 int error, ret, attrflag; 1342 struct nfsvattr nfsva; 1343 1344 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva, 1345 &attrflag, NULL); 1346 if (attrflag) { 1347 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1348 if (ret && !error) 1349 error = ret; 1350 } 1351 if (error && NFS_ISV4(vp)) 1352 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1353 return (error); 1354 } 1355 1356 /* 1357 * nfs read rpc call 1358 * Ditto above 1359 */ 1360 int 1361 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1362 { 1363 int error, ret, attrflag; 1364 struct nfsvattr nfsva; 1365 struct nfsmount *nmp; 1366 1367 nmp = VFSTONFS(vnode_mount(vp)); 1368 error = EIO; 1369 attrflag = 0; 1370 if (NFSHASPNFS(nmp)) 1371 error = nfscl_doiods(vp, uiop, NULL, NULL, 1372 NFSV4OPEN_ACCESSREAD, cred, uiop->uio_td); 1373 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error); 1374 if (error != 0) 1375 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, 1376 &attrflag, NULL); 1377 if (attrflag) { 1378 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1379 if (ret && !error) 1380 error = ret; 1381 } 1382 if (error && NFS_ISV4(vp)) 1383 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1384 return (error); 1385 } 1386 1387 /* 1388 * nfs write call 1389 */ 1390 int 1391 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1392 int *iomode, int *must_commit, int called_from_strategy) 1393 { 1394 struct nfsvattr nfsva; 1395 int error, attrflag, ret; 1396 struct nfsmount *nmp; 1397 1398 nmp = VFSTONFS(vnode_mount(vp)); 1399 error = EIO; 1400 attrflag = 0; 1401 if (NFSHASPNFS(nmp)) 1402 error = nfscl_doiods(vp, uiop, iomode, must_commit, 1403 NFSV4OPEN_ACCESSWRITE, cred, uiop->uio_td); 1404 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error); 1405 if (error != 0) 1406 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred, 1407 uiop->uio_td, &nfsva, &attrflag, NULL, 1408 called_from_strategy); 1409 if (attrflag) { 1410 if (VTONFS(vp)->n_flag & ND_NFSV4) 1411 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1, 1412 1); 1413 else 1414 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1415 1); 1416 if (ret && !error) 1417 error = ret; 1418 } 1419 if (DOINGASYNC(vp)) 1420 *iomode = NFSWRITE_FILESYNC; 1421 if (error && NFS_ISV4(vp)) 1422 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1423 return (error); 1424 } 1425 1426 /* 1427 * nfs mknod rpc 1428 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1429 * mode set to specify the file type and the size field for rdev. 1430 */ 1431 static int 1432 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1433 struct vattr *vap) 1434 { 1435 struct nfsvattr nfsva, dnfsva; 1436 struct vnode *newvp = NULL; 1437 struct nfsnode *np = NULL, *dnp; 1438 struct nfsfh *nfhp; 1439 struct vattr vattr; 1440 int error = 0, attrflag, dattrflag; 1441 u_int32_t rdev; 1442 1443 if (vap->va_type == VCHR || vap->va_type == VBLK) 1444 rdev = vap->va_rdev; 1445 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1446 rdev = 0xffffffff; 1447 else 1448 return (EOPNOTSUPP); 1449 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1450 return (error); 1451 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap, 1452 rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva, 1453 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 1454 if (!error) { 1455 if (!nfhp) 1456 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1457 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, 1458 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1459 NULL); 1460 if (nfhp) 1461 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1462 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE); 1463 } 1464 if (dattrflag) 1465 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1466 if (!error) { 1467 newvp = NFSTOV(np); 1468 if (attrflag != 0) { 1469 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1470 0, 1); 1471 if (error != 0) 1472 vput(newvp); 1473 } 1474 } 1475 if (!error) { 1476 *vpp = newvp; 1477 } else if (NFS_ISV4(dvp)) { 1478 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid, 1479 vap->va_gid); 1480 } 1481 dnp = VTONFS(dvp); 1482 mtx_lock(&dnp->n_mtx); 1483 dnp->n_flag |= NMODIFIED; 1484 if (!dattrflag) { 1485 dnp->n_attrstamp = 0; 1486 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1487 } 1488 mtx_unlock(&dnp->n_mtx); 1489 return (error); 1490 } 1491 1492 /* 1493 * nfs mknod vop 1494 * just call nfs_mknodrpc() to do the work. 1495 */ 1496 /* ARGSUSED */ 1497 static int 1498 nfs_mknod(struct vop_mknod_args *ap) 1499 { 1500 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1501 } 1502 1503 static struct mtx nfs_cverf_mtx; 1504 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex", 1505 MTX_DEF); 1506 1507 static nfsquad_t 1508 nfs_get_cverf(void) 1509 { 1510 static nfsquad_t cverf; 1511 nfsquad_t ret; 1512 static int cverf_initialized = 0; 1513 1514 mtx_lock(&nfs_cverf_mtx); 1515 if (cverf_initialized == 0) { 1516 cverf.lval[0] = arc4random(); 1517 cverf.lval[1] = arc4random(); 1518 cverf_initialized = 1; 1519 } else 1520 cverf.qval++; 1521 ret = cverf; 1522 mtx_unlock(&nfs_cverf_mtx); 1523 1524 return (ret); 1525 } 1526 1527 /* 1528 * nfs file create call 1529 */ 1530 static int 1531 nfs_create(struct vop_create_args *ap) 1532 { 1533 struct vnode *dvp = ap->a_dvp; 1534 struct vattr *vap = ap->a_vap; 1535 struct componentname *cnp = ap->a_cnp; 1536 struct nfsnode *np = NULL, *dnp; 1537 struct vnode *newvp = NULL; 1538 struct nfsmount *nmp; 1539 struct nfsvattr dnfsva, nfsva; 1540 struct nfsfh *nfhp; 1541 nfsquad_t cverf; 1542 int error = 0, attrflag, dattrflag, fmode = 0; 1543 struct vattr vattr; 1544 1545 /* 1546 * Oops, not for me.. 1547 */ 1548 if (vap->va_type == VSOCK) 1549 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1550 1551 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1552 return (error); 1553 if (vap->va_vaflags & VA_EXCLUSIVE) 1554 fmode |= O_EXCL; 1555 dnp = VTONFS(dvp); 1556 nmp = VFSTONFS(vnode_mount(dvp)); 1557 again: 1558 /* For NFSv4, wait until any remove is done. */ 1559 mtx_lock(&dnp->n_mtx); 1560 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) { 1561 dnp->n_flag |= NREMOVEWANT; 1562 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0); 1563 } 1564 mtx_unlock(&dnp->n_mtx); 1565 1566 cverf = nfs_get_cverf(); 1567 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1568 vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, 1569 &nfhp, &attrflag, &dattrflag, NULL); 1570 if (!error) { 1571 if (nfhp == NULL) 1572 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1573 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, 1574 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1575 NULL); 1576 if (nfhp != NULL) 1577 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1578 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE); 1579 } 1580 if (dattrflag) 1581 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1582 if (!error) { 1583 newvp = NFSTOV(np); 1584 if (attrflag == 0) 1585 error = nfsrpc_getattr(newvp, cnp->cn_cred, 1586 cnp->cn_thread, &nfsva, NULL); 1587 if (error == 0) 1588 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1589 0, 1); 1590 } 1591 if (error) { 1592 if (newvp != NULL) { 1593 vput(newvp); 1594 newvp = NULL; 1595 } 1596 if (NFS_ISV34(dvp) && (fmode & O_EXCL) && 1597 error == NFSERR_NOTSUPP) { 1598 fmode &= ~O_EXCL; 1599 goto again; 1600 } 1601 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) { 1602 if (nfscl_checksattr(vap, &nfsva)) { 1603 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred, 1604 cnp->cn_thread, &nfsva, &attrflag, NULL); 1605 if (error && (vap->va_uid != (uid_t)VNOVAL || 1606 vap->va_gid != (gid_t)VNOVAL)) { 1607 /* try again without setting uid/gid */ 1608 vap->va_uid = (uid_t)VNOVAL; 1609 vap->va_gid = (uid_t)VNOVAL; 1610 error = nfsrpc_setattr(newvp, vap, NULL, 1611 cnp->cn_cred, cnp->cn_thread, &nfsva, 1612 &attrflag, NULL); 1613 } 1614 if (attrflag) 1615 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 1616 NULL, 0, 1); 1617 if (error != 0) 1618 vput(newvp); 1619 } 1620 } 1621 if (!error) { 1622 if ((cnp->cn_flags & MAKEENTRY) && attrflag) 1623 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 1624 NULL); 1625 *ap->a_vpp = newvp; 1626 } else if (NFS_ISV4(dvp)) { 1627 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid, 1628 vap->va_gid); 1629 } 1630 mtx_lock(&dnp->n_mtx); 1631 dnp->n_flag |= NMODIFIED; 1632 if (!dattrflag) { 1633 dnp->n_attrstamp = 0; 1634 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1635 } 1636 mtx_unlock(&dnp->n_mtx); 1637 return (error); 1638 } 1639 1640 /* 1641 * nfs file remove call 1642 * To try and make nfs semantics closer to ufs semantics, a file that has 1643 * other processes using the vnode is renamed instead of removed and then 1644 * removed later on the last close. 1645 * - If v_usecount > 1 1646 * If a rename is not already in the works 1647 * call nfs_sillyrename() to set it up 1648 * else 1649 * do the remove rpc 1650 */ 1651 static int 1652 nfs_remove(struct vop_remove_args *ap) 1653 { 1654 struct vnode *vp = ap->a_vp; 1655 struct vnode *dvp = ap->a_dvp; 1656 struct componentname *cnp = ap->a_cnp; 1657 struct nfsnode *np = VTONFS(vp); 1658 int error = 0; 1659 struct vattr vattr; 1660 1661 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name")); 1662 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount")); 1663 if (vp->v_type == VDIR) 1664 error = EPERM; 1665 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1666 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1667 vattr.va_nlink > 1)) { 1668 /* 1669 * Purge the name cache so that the chance of a lookup for 1670 * the name succeeding while the remove is in progress is 1671 * minimized. Without node locking it can still happen, such 1672 * that an I/O op returns ESTALE, but since you get this if 1673 * another host removes the file.. 1674 */ 1675 cache_purge(vp); 1676 /* 1677 * throw away biocache buffers, mainly to avoid 1678 * unnecessary delayed writes later. 1679 */ 1680 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1); 1681 if (error == 0 && (vp->v_iflag & VI_DOOMED) != 0) 1682 error = EBADF; 1683 else if (error != EINTR && error != EIO) 1684 /* Do the rpc */ 1685 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr, 1686 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1687 /* 1688 * Kludge City: If the first reply to the remove rpc is lost.. 1689 * the reply to the retransmitted request will be ENOENT 1690 * since the file was in fact removed 1691 * Therefore, we cheat and return success. 1692 */ 1693 if (error == ENOENT) 1694 error = 0; 1695 } else if (!np->n_sillyrename) 1696 error = nfs_sillyrename(dvp, vp, cnp); 1697 mtx_lock(&np->n_mtx); 1698 np->n_attrstamp = 0; 1699 mtx_unlock(&np->n_mtx); 1700 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1701 return (error); 1702 } 1703 1704 /* 1705 * nfs file remove rpc called from nfs_inactive 1706 */ 1707 int 1708 ncl_removeit(struct sillyrename *sp, struct vnode *vp) 1709 { 1710 /* 1711 * Make sure that the directory vnode is still valid. 1712 * XXX we should lock sp->s_dvp here. 1713 */ 1714 if (sp->s_dvp->v_type == VBAD) 1715 return (0); 1716 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen, 1717 sp->s_cred, NULL)); 1718 } 1719 1720 /* 1721 * Nfs remove rpc, called from nfs_remove() and ncl_removeit(). 1722 */ 1723 static int 1724 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 1725 int namelen, struct ucred *cred, struct thread *td) 1726 { 1727 struct nfsvattr dnfsva; 1728 struct nfsnode *dnp = VTONFS(dvp); 1729 int error = 0, dattrflag; 1730 1731 mtx_lock(&dnp->n_mtx); 1732 dnp->n_flag |= NREMOVEINPROG; 1733 mtx_unlock(&dnp->n_mtx); 1734 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva, 1735 &dattrflag, NULL); 1736 mtx_lock(&dnp->n_mtx); 1737 if ((dnp->n_flag & NREMOVEWANT)) { 1738 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG); 1739 mtx_unlock(&dnp->n_mtx); 1740 wakeup((caddr_t)dnp); 1741 } else { 1742 dnp->n_flag &= ~NREMOVEINPROG; 1743 mtx_unlock(&dnp->n_mtx); 1744 } 1745 if (dattrflag) 1746 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1747 mtx_lock(&dnp->n_mtx); 1748 dnp->n_flag |= NMODIFIED; 1749 if (!dattrflag) { 1750 dnp->n_attrstamp = 0; 1751 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1752 } 1753 mtx_unlock(&dnp->n_mtx); 1754 if (error && NFS_ISV4(dvp)) 1755 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1756 return (error); 1757 } 1758 1759 /* 1760 * nfs file rename call 1761 */ 1762 static int 1763 nfs_rename(struct vop_rename_args *ap) 1764 { 1765 struct vnode *fvp = ap->a_fvp; 1766 struct vnode *tvp = ap->a_tvp; 1767 struct vnode *fdvp = ap->a_fdvp; 1768 struct vnode *tdvp = ap->a_tdvp; 1769 struct componentname *tcnp = ap->a_tcnp; 1770 struct componentname *fcnp = ap->a_fcnp; 1771 struct nfsnode *fnp = VTONFS(ap->a_fvp); 1772 struct nfsnode *tdnp = VTONFS(ap->a_tdvp); 1773 struct nfsv4node *newv4 = NULL; 1774 int error; 1775 1776 KASSERT((tcnp->cn_flags & HASBUF) != 0 && 1777 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name")); 1778 /* Check for cross-device rename */ 1779 if ((fvp->v_mount != tdvp->v_mount) || 1780 (tvp && (fvp->v_mount != tvp->v_mount))) { 1781 error = EXDEV; 1782 goto out; 1783 } 1784 1785 if (fvp == tvp) { 1786 printf("nfs_rename: fvp == tvp (can't happen)\n"); 1787 error = 0; 1788 goto out; 1789 } 1790 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0) 1791 goto out; 1792 1793 /* 1794 * We have to flush B_DELWRI data prior to renaming 1795 * the file. If we don't, the delayed-write buffers 1796 * can be flushed out later after the file has gone stale 1797 * under NFSV3. NFSV2 does not have this problem because 1798 * ( as far as I can tell ) it flushes dirty buffers more 1799 * often. 1800 * 1801 * Skip the rename operation if the fsync fails, this can happen 1802 * due to the server's volume being full, when we pushed out data 1803 * that was written back to our cache earlier. Not checking for 1804 * this condition can result in potential (silent) data loss. 1805 */ 1806 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread); 1807 NFSVOPUNLOCK(fvp, 0); 1808 if (!error && tvp) 1809 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread); 1810 if (error) 1811 goto out; 1812 1813 /* 1814 * If the tvp exists and is in use, sillyrename it before doing the 1815 * rename of the new file over it. 1816 * XXX Can't sillyrename a directory. 1817 */ 1818 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1819 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1820 vput(tvp); 1821 tvp = NULL; 1822 } 1823 1824 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1825 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1826 tcnp->cn_thread); 1827 1828 if (error == 0 && NFS_ISV4(tdvp)) { 1829 /* 1830 * For NFSv4, check to see if it is the same name and 1831 * replace the name, if it is different. 1832 */ 1833 MALLOC(newv4, struct nfsv4node *, 1834 sizeof (struct nfsv4node) + 1835 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1, 1836 M_NFSV4NODE, M_WAITOK); 1837 mtx_lock(&tdnp->n_mtx); 1838 mtx_lock(&fnp->n_mtx); 1839 if (fnp->n_v4 != NULL && fvp->v_type == VREG && 1840 (fnp->n_v4->n4_namelen != tcnp->cn_namelen || 1841 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4), 1842 tcnp->cn_namelen) || 1843 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen || 1844 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 1845 tdnp->n_fhp->nfh_len))) { 1846 #ifdef notdef 1847 { char nnn[100]; int nnnl; 1848 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99; 1849 bcopy(tcnp->cn_nameptr, nnn, nnnl); 1850 nnn[nnnl] = '\0'; 1851 printf("ren replace=%s\n",nnn); 1852 } 1853 #endif 1854 FREE((caddr_t)fnp->n_v4, M_NFSV4NODE); 1855 fnp->n_v4 = newv4; 1856 newv4 = NULL; 1857 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len; 1858 fnp->n_v4->n4_namelen = tcnp->cn_namelen; 1859 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 1860 tdnp->n_fhp->nfh_len); 1861 NFSBCOPY(tcnp->cn_nameptr, 1862 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen); 1863 } 1864 mtx_unlock(&tdnp->n_mtx); 1865 mtx_unlock(&fnp->n_mtx); 1866 if (newv4 != NULL) 1867 FREE((caddr_t)newv4, M_NFSV4NODE); 1868 } 1869 1870 if (fvp->v_type == VDIR) { 1871 if (tvp != NULL && tvp->v_type == VDIR) 1872 cache_purge(tdvp); 1873 cache_purge(fdvp); 1874 } 1875 1876 out: 1877 if (tdvp == tvp) 1878 vrele(tdvp); 1879 else 1880 vput(tdvp); 1881 if (tvp) 1882 vput(tvp); 1883 vrele(fdvp); 1884 vrele(fvp); 1885 /* 1886 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1887 */ 1888 if (error == ENOENT) 1889 error = 0; 1890 return (error); 1891 } 1892 1893 /* 1894 * nfs file rename rpc called from nfs_remove() above 1895 */ 1896 static int 1897 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp, 1898 struct sillyrename *sp) 1899 { 1900 1901 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen, 1902 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred, 1903 scnp->cn_thread)); 1904 } 1905 1906 /* 1907 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1908 */ 1909 static int 1910 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr, 1911 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr, 1912 int tnamelen, struct ucred *cred, struct thread *td) 1913 { 1914 struct nfsvattr fnfsva, tnfsva; 1915 struct nfsnode *fdnp = VTONFS(fdvp); 1916 struct nfsnode *tdnp = VTONFS(tdvp); 1917 int error = 0, fattrflag, tattrflag; 1918 1919 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp, 1920 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag, 1921 &tattrflag, NULL, NULL); 1922 mtx_lock(&fdnp->n_mtx); 1923 fdnp->n_flag |= NMODIFIED; 1924 if (fattrflag != 0) { 1925 mtx_unlock(&fdnp->n_mtx); 1926 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1); 1927 } else { 1928 fdnp->n_attrstamp = 0; 1929 mtx_unlock(&fdnp->n_mtx); 1930 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 1931 } 1932 mtx_lock(&tdnp->n_mtx); 1933 tdnp->n_flag |= NMODIFIED; 1934 if (tattrflag != 0) { 1935 mtx_unlock(&tdnp->n_mtx); 1936 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1); 1937 } else { 1938 tdnp->n_attrstamp = 0; 1939 mtx_unlock(&tdnp->n_mtx); 1940 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 1941 } 1942 if (error && NFS_ISV4(fdvp)) 1943 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1944 return (error); 1945 } 1946 1947 /* 1948 * nfs hard link create call 1949 */ 1950 static int 1951 nfs_link(struct vop_link_args *ap) 1952 { 1953 struct vnode *vp = ap->a_vp; 1954 struct vnode *tdvp = ap->a_tdvp; 1955 struct componentname *cnp = ap->a_cnp; 1956 struct nfsnode *np, *tdnp; 1957 struct nfsvattr nfsva, dnfsva; 1958 int error = 0, attrflag, dattrflag; 1959 1960 /* 1961 * Push all writes to the server, so that the attribute cache 1962 * doesn't get "out of sync" with the server. 1963 * XXX There should be a better way! 1964 */ 1965 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread); 1966 1967 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 1968 cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag, 1969 &dattrflag, NULL); 1970 tdnp = VTONFS(tdvp); 1971 mtx_lock(&tdnp->n_mtx); 1972 tdnp->n_flag |= NMODIFIED; 1973 if (dattrflag != 0) { 1974 mtx_unlock(&tdnp->n_mtx); 1975 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1); 1976 } else { 1977 tdnp->n_attrstamp = 0; 1978 mtx_unlock(&tdnp->n_mtx); 1979 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 1980 } 1981 if (attrflag) 1982 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1983 else { 1984 np = VTONFS(vp); 1985 mtx_lock(&np->n_mtx); 1986 np->n_attrstamp = 0; 1987 mtx_unlock(&np->n_mtx); 1988 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1989 } 1990 /* 1991 * If negative lookup caching is enabled, I might as well 1992 * add an entry for this node. Not necessary for correctness, 1993 * but if negative caching is enabled, then the system 1994 * must care about lookup caching hit rate, so... 1995 */ 1996 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 && 1997 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 1998 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL); 1999 } 2000 if (error && NFS_ISV4(vp)) 2001 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0, 2002 (gid_t)0); 2003 return (error); 2004 } 2005 2006 /* 2007 * nfs symbolic link create call 2008 */ 2009 static int 2010 nfs_symlink(struct vop_symlink_args *ap) 2011 { 2012 struct vnode *dvp = ap->a_dvp; 2013 struct vattr *vap = ap->a_vap; 2014 struct componentname *cnp = ap->a_cnp; 2015 struct nfsvattr nfsva, dnfsva; 2016 struct nfsfh *nfhp; 2017 struct nfsnode *np = NULL, *dnp; 2018 struct vnode *newvp = NULL; 2019 int error = 0, attrflag, dattrflag, ret; 2020 2021 vap->va_type = VLNK; 2022 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2023 ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, 2024 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 2025 if (nfhp) { 2026 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread, 2027 &np, NULL, LK_EXCLUSIVE); 2028 if (!ret) 2029 newvp = NFSTOV(np); 2030 else if (!error) 2031 error = ret; 2032 } 2033 if (newvp != NULL) { 2034 if (attrflag) 2035 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2036 0, 1); 2037 } else if (!error) { 2038 /* 2039 * If we do not have an error and we could not extract the 2040 * newvp from the response due to the request being NFSv2, we 2041 * have to do a lookup in order to obtain a newvp to return. 2042 */ 2043 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2044 cnp->cn_cred, cnp->cn_thread, &np); 2045 if (!error) 2046 newvp = NFSTOV(np); 2047 } 2048 if (error) { 2049 if (newvp) 2050 vput(newvp); 2051 if (NFS_ISV4(dvp)) 2052 error = nfscl_maperr(cnp->cn_thread, error, 2053 vap->va_uid, vap->va_gid); 2054 } else { 2055 *ap->a_vpp = newvp; 2056 } 2057 2058 dnp = VTONFS(dvp); 2059 mtx_lock(&dnp->n_mtx); 2060 dnp->n_flag |= NMODIFIED; 2061 if (dattrflag != 0) { 2062 mtx_unlock(&dnp->n_mtx); 2063 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2064 } else { 2065 dnp->n_attrstamp = 0; 2066 mtx_unlock(&dnp->n_mtx); 2067 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2068 } 2069 /* 2070 * If negative lookup caching is enabled, I might as well 2071 * add an entry for this node. Not necessary for correctness, 2072 * but if negative caching is enabled, then the system 2073 * must care about lookup caching hit rate, so... 2074 */ 2075 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2076 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2077 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL); 2078 } 2079 return (error); 2080 } 2081 2082 /* 2083 * nfs make dir call 2084 */ 2085 static int 2086 nfs_mkdir(struct vop_mkdir_args *ap) 2087 { 2088 struct vnode *dvp = ap->a_dvp; 2089 struct vattr *vap = ap->a_vap; 2090 struct componentname *cnp = ap->a_cnp; 2091 struct nfsnode *np = NULL, *dnp; 2092 struct vnode *newvp = NULL; 2093 struct vattr vattr; 2094 struct nfsfh *nfhp; 2095 struct nfsvattr nfsva, dnfsva; 2096 int error = 0, attrflag, dattrflag, ret; 2097 2098 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2099 return (error); 2100 vap->va_type = VDIR; 2101 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2102 vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp, 2103 &attrflag, &dattrflag, NULL); 2104 dnp = VTONFS(dvp); 2105 mtx_lock(&dnp->n_mtx); 2106 dnp->n_flag |= NMODIFIED; 2107 if (dattrflag != 0) { 2108 mtx_unlock(&dnp->n_mtx); 2109 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2110 } else { 2111 dnp->n_attrstamp = 0; 2112 mtx_unlock(&dnp->n_mtx); 2113 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2114 } 2115 if (nfhp) { 2116 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread, 2117 &np, NULL, LK_EXCLUSIVE); 2118 if (!ret) { 2119 newvp = NFSTOV(np); 2120 if (attrflag) 2121 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 2122 NULL, 0, 1); 2123 } else if (!error) 2124 error = ret; 2125 } 2126 if (!error && newvp == NULL) { 2127 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2128 cnp->cn_cred, cnp->cn_thread, &np); 2129 if (!error) { 2130 newvp = NFSTOV(np); 2131 if (newvp->v_type != VDIR) 2132 error = EEXIST; 2133 } 2134 } 2135 if (error) { 2136 if (newvp) 2137 vput(newvp); 2138 if (NFS_ISV4(dvp)) 2139 error = nfscl_maperr(cnp->cn_thread, error, 2140 vap->va_uid, vap->va_gid); 2141 } else { 2142 /* 2143 * If negative lookup caching is enabled, I might as well 2144 * add an entry for this node. Not necessary for correctness, 2145 * but if negative caching is enabled, then the system 2146 * must care about lookup caching hit rate, so... 2147 */ 2148 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2149 (cnp->cn_flags & MAKEENTRY) && 2150 attrflag != 0 && dattrflag != 0) 2151 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 2152 &dnfsva.na_ctime); 2153 *ap->a_vpp = newvp; 2154 } 2155 return (error); 2156 } 2157 2158 /* 2159 * nfs remove directory call 2160 */ 2161 static int 2162 nfs_rmdir(struct vop_rmdir_args *ap) 2163 { 2164 struct vnode *vp = ap->a_vp; 2165 struct vnode *dvp = ap->a_dvp; 2166 struct componentname *cnp = ap->a_cnp; 2167 struct nfsnode *dnp; 2168 struct nfsvattr dnfsva; 2169 int error, dattrflag; 2170 2171 if (dvp == vp) 2172 return (EINVAL); 2173 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2174 cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL); 2175 dnp = VTONFS(dvp); 2176 mtx_lock(&dnp->n_mtx); 2177 dnp->n_flag |= NMODIFIED; 2178 if (dattrflag != 0) { 2179 mtx_unlock(&dnp->n_mtx); 2180 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2181 } else { 2182 dnp->n_attrstamp = 0; 2183 mtx_unlock(&dnp->n_mtx); 2184 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2185 } 2186 2187 cache_purge(dvp); 2188 cache_purge(vp); 2189 if (error && NFS_ISV4(dvp)) 2190 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0, 2191 (gid_t)0); 2192 /* 2193 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2194 */ 2195 if (error == ENOENT) 2196 error = 0; 2197 return (error); 2198 } 2199 2200 /* 2201 * nfs readdir call 2202 */ 2203 static int 2204 nfs_readdir(struct vop_readdir_args *ap) 2205 { 2206 struct vnode *vp = ap->a_vp; 2207 struct nfsnode *np = VTONFS(vp); 2208 struct uio *uio = ap->a_uio; 2209 ssize_t tresid, left; 2210 int error = 0; 2211 struct vattr vattr; 2212 2213 if (ap->a_eofflag != NULL) 2214 *ap->a_eofflag = 0; 2215 if (vp->v_type != VDIR) 2216 return(EPERM); 2217 2218 /* 2219 * First, check for hit on the EOF offset cache 2220 */ 2221 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2222 (np->n_flag & NMODIFIED) == 0) { 2223 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2224 mtx_lock(&np->n_mtx); 2225 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) || 2226 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2227 mtx_unlock(&np->n_mtx); 2228 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits); 2229 if (ap->a_eofflag != NULL) 2230 *ap->a_eofflag = 1; 2231 return (0); 2232 } else 2233 mtx_unlock(&np->n_mtx); 2234 } 2235 } 2236 2237 /* 2238 * NFS always guarantees that directory entries don't straddle 2239 * DIRBLKSIZ boundaries. As such, we need to limit the size 2240 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial 2241 * directory entry. 2242 */ 2243 left = uio->uio_resid % DIRBLKSIZ; 2244 if (left == uio->uio_resid) 2245 return (EINVAL); 2246 uio->uio_resid -= left; 2247 2248 /* 2249 * Call ncl_bioread() to do the real work. 2250 */ 2251 tresid = uio->uio_resid; 2252 error = ncl_bioread(vp, uio, 0, ap->a_cred); 2253 2254 if (!error && uio->uio_resid == tresid) { 2255 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses); 2256 if (ap->a_eofflag != NULL) 2257 *ap->a_eofflag = 1; 2258 } 2259 2260 /* Add the partial DIRBLKSIZ (left) back in. */ 2261 uio->uio_resid += left; 2262 return (error); 2263 } 2264 2265 /* 2266 * Readdir rpc call. 2267 * Called from below the buffer cache by ncl_doio(). 2268 */ 2269 int 2270 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2271 struct thread *td) 2272 { 2273 struct nfsvattr nfsva; 2274 nfsuint64 *cookiep, cookie; 2275 struct nfsnode *dnp = VTONFS(vp); 2276 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2277 int error = 0, eof, attrflag; 2278 2279 KASSERT(uiop->uio_iovcnt == 1 && 2280 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2281 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2282 ("nfs readdirrpc bad uio")); 2283 2284 /* 2285 * If there is no cookie, assume directory was stale. 2286 */ 2287 ncl_dircookie_lock(dnp); 2288 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2289 if (cookiep) { 2290 cookie = *cookiep; 2291 ncl_dircookie_unlock(dnp); 2292 } else { 2293 ncl_dircookie_unlock(dnp); 2294 return (NFSERR_BAD_COOKIE); 2295 } 2296 2297 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2298 (void)ncl_fsinfo(nmp, vp, cred, td); 2299 2300 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva, 2301 &attrflag, &eof, NULL); 2302 if (attrflag) 2303 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2304 2305 if (!error) { 2306 /* 2307 * We are now either at the end of the directory or have filled 2308 * the block. 2309 */ 2310 if (eof) 2311 dnp->n_direofoffset = uiop->uio_offset; 2312 else { 2313 if (uiop->uio_resid > 0) 2314 printf("EEK! readdirrpc resid > 0\n"); 2315 ncl_dircookie_lock(dnp); 2316 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2317 *cookiep = cookie; 2318 ncl_dircookie_unlock(dnp); 2319 } 2320 } else if (NFS_ISV4(vp)) { 2321 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2322 } 2323 return (error); 2324 } 2325 2326 /* 2327 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc(). 2328 */ 2329 int 2330 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2331 struct thread *td) 2332 { 2333 struct nfsvattr nfsva; 2334 nfsuint64 *cookiep, cookie; 2335 struct nfsnode *dnp = VTONFS(vp); 2336 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2337 int error = 0, attrflag, eof; 2338 2339 KASSERT(uiop->uio_iovcnt == 1 && 2340 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2341 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2342 ("nfs readdirplusrpc bad uio")); 2343 2344 /* 2345 * If there is no cookie, assume directory was stale. 2346 */ 2347 ncl_dircookie_lock(dnp); 2348 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2349 if (cookiep) { 2350 cookie = *cookiep; 2351 ncl_dircookie_unlock(dnp); 2352 } else { 2353 ncl_dircookie_unlock(dnp); 2354 return (NFSERR_BAD_COOKIE); 2355 } 2356 2357 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2358 (void)ncl_fsinfo(nmp, vp, cred, td); 2359 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva, 2360 &attrflag, &eof, NULL); 2361 if (attrflag) 2362 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2363 2364 if (!error) { 2365 /* 2366 * We are now either at end of the directory or have filled the 2367 * the block. 2368 */ 2369 if (eof) 2370 dnp->n_direofoffset = uiop->uio_offset; 2371 else { 2372 if (uiop->uio_resid > 0) 2373 printf("EEK! readdirplusrpc resid > 0\n"); 2374 ncl_dircookie_lock(dnp); 2375 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2376 *cookiep = cookie; 2377 ncl_dircookie_unlock(dnp); 2378 } 2379 } else if (NFS_ISV4(vp)) { 2380 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2381 } 2382 return (error); 2383 } 2384 2385 /* 2386 * Silly rename. To make the NFS filesystem that is stateless look a little 2387 * more like the "ufs" a remove of an active vnode is translated to a rename 2388 * to a funny looking filename that is removed by nfs_inactive on the 2389 * nfsnode. There is the potential for another process on a different client 2390 * to create the same funny name between the nfs_lookitup() fails and the 2391 * nfs_rename() completes, but... 2392 */ 2393 static int 2394 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2395 { 2396 struct sillyrename *sp; 2397 struct nfsnode *np; 2398 int error; 2399 short pid; 2400 unsigned int lticks; 2401 2402 cache_purge(dvp); 2403 np = VTONFS(vp); 2404 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir")); 2405 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2406 M_NEWNFSREQ, M_WAITOK); 2407 sp->s_cred = crhold(cnp->cn_cred); 2408 sp->s_dvp = dvp; 2409 VREF(dvp); 2410 2411 /* 2412 * Fudge together a funny name. 2413 * Changing the format of the funny name to accommodate more 2414 * sillynames per directory. 2415 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2416 * CPU ticks since boot. 2417 */ 2418 pid = cnp->cn_thread->td_proc->p_pid; 2419 lticks = (unsigned int)ticks; 2420 for ( ; ; ) { 2421 sp->s_namlen = sprintf(sp->s_name, 2422 ".nfs.%08x.%04x4.4", lticks, 2423 pid); 2424 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2425 cnp->cn_thread, NULL)) 2426 break; 2427 lticks++; 2428 } 2429 error = nfs_renameit(dvp, vp, cnp, sp); 2430 if (error) 2431 goto bad; 2432 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2433 cnp->cn_thread, &np); 2434 np->n_sillyrename = sp; 2435 return (0); 2436 bad: 2437 vrele(sp->s_dvp); 2438 crfree(sp->s_cred); 2439 free((caddr_t)sp, M_NEWNFSREQ); 2440 return (error); 2441 } 2442 2443 /* 2444 * Look up a file name and optionally either update the file handle or 2445 * allocate an nfsnode, depending on the value of npp. 2446 * npp == NULL --> just do the lookup 2447 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2448 * handled too 2449 * *npp != NULL --> update the file handle in the vnode 2450 */ 2451 static int 2452 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred, 2453 struct thread *td, struct nfsnode **npp) 2454 { 2455 struct vnode *newvp = NULL, *vp; 2456 struct nfsnode *np, *dnp = VTONFS(dvp); 2457 struct nfsfh *nfhp, *onfhp; 2458 struct nfsvattr nfsva, dnfsva; 2459 struct componentname cn; 2460 int error = 0, attrflag, dattrflag; 2461 u_int hash; 2462 2463 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva, 2464 &nfhp, &attrflag, &dattrflag, NULL); 2465 if (dattrflag) 2466 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2467 if (npp && !error) { 2468 if (*npp != NULL) { 2469 np = *npp; 2470 vp = NFSTOV(np); 2471 /* 2472 * For NFSv4, check to see if it is the same name and 2473 * replace the name, if it is different. 2474 */ 2475 if (np->n_v4 != NULL && nfsva.na_type == VREG && 2476 (np->n_v4->n4_namelen != len || 2477 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) || 2478 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen || 2479 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2480 dnp->n_fhp->nfh_len))) { 2481 #ifdef notdef 2482 { char nnn[100]; int nnnl; 2483 nnnl = (len < 100) ? len : 99; 2484 bcopy(name, nnn, nnnl); 2485 nnn[nnnl] = '\0'; 2486 printf("replace=%s\n",nnn); 2487 } 2488 #endif 2489 FREE((caddr_t)np->n_v4, M_NFSV4NODE); 2490 MALLOC(np->n_v4, struct nfsv4node *, 2491 sizeof (struct nfsv4node) + 2492 dnp->n_fhp->nfh_len + len - 1, 2493 M_NFSV4NODE, M_WAITOK); 2494 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len; 2495 np->n_v4->n4_namelen = len; 2496 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2497 dnp->n_fhp->nfh_len); 2498 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len); 2499 } 2500 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, 2501 FNV1_32_INIT); 2502 onfhp = np->n_fhp; 2503 /* 2504 * Rehash node for new file handle. 2505 */ 2506 vfs_hash_rehash(vp, hash); 2507 np->n_fhp = nfhp; 2508 if (onfhp != NULL) 2509 FREE((caddr_t)onfhp, M_NFSFH); 2510 newvp = NFSTOV(np); 2511 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) { 2512 FREE((caddr_t)nfhp, M_NFSFH); 2513 VREF(dvp); 2514 newvp = dvp; 2515 } else { 2516 cn.cn_nameptr = name; 2517 cn.cn_namelen = len; 2518 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td, 2519 &np, NULL, LK_EXCLUSIVE); 2520 if (error) 2521 return (error); 2522 newvp = NFSTOV(np); 2523 } 2524 if (!attrflag && *npp == NULL) { 2525 if (newvp == dvp) 2526 vrele(newvp); 2527 else 2528 vput(newvp); 2529 return (ENOENT); 2530 } 2531 if (attrflag) 2532 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2533 0, 1); 2534 } 2535 if (npp && *npp == NULL) { 2536 if (error) { 2537 if (newvp) { 2538 if (newvp == dvp) 2539 vrele(newvp); 2540 else 2541 vput(newvp); 2542 } 2543 } else 2544 *npp = np; 2545 } 2546 if (error && NFS_ISV4(dvp)) 2547 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2548 return (error); 2549 } 2550 2551 /* 2552 * Nfs Version 3 and 4 commit rpc 2553 */ 2554 int 2555 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2556 struct thread *td) 2557 { 2558 struct nfsvattr nfsva; 2559 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2560 int error, attrflag; 2561 2562 mtx_lock(&nmp->nm_mtx); 2563 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2564 mtx_unlock(&nmp->nm_mtx); 2565 return (0); 2566 } 2567 mtx_unlock(&nmp->nm_mtx); 2568 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva, 2569 &attrflag, NULL); 2570 if (attrflag != 0) 2571 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 2572 0, 1); 2573 if (error != 0 && NFS_ISV4(vp)) 2574 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2575 return (error); 2576 } 2577 2578 /* 2579 * Strategy routine. 2580 * For async requests when nfsiod(s) are running, queue the request by 2581 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the 2582 * request. 2583 */ 2584 static int 2585 nfs_strategy(struct vop_strategy_args *ap) 2586 { 2587 struct buf *bp; 2588 struct vnode *vp; 2589 struct ucred *cr; 2590 2591 bp = ap->a_bp; 2592 vp = ap->a_vp; 2593 KASSERT(bp->b_vp == vp, ("missing b_getvp")); 2594 KASSERT(!(bp->b_flags & B_DONE), 2595 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2596 BUF_ASSERT_HELD(bp); 2597 2598 if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno) 2599 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize / 2600 DEV_BSIZE); 2601 if (bp->b_iocmd == BIO_READ) 2602 cr = bp->b_rcred; 2603 else 2604 cr = bp->b_wcred; 2605 2606 /* 2607 * If the op is asynchronous and an i/o daemon is waiting 2608 * queue the request, wake it up and wait for completion 2609 * otherwise just do it ourselves. 2610 */ 2611 if ((bp->b_flags & B_ASYNC) == 0 || 2612 ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread)) 2613 (void) ncl_doio(vp, bp, cr, curthread, 1); 2614 return (0); 2615 } 2616 2617 /* 2618 * fsync vnode op. Just call ncl_flush() with commit == 1. 2619 */ 2620 /* ARGSUSED */ 2621 static int 2622 nfs_fsync(struct vop_fsync_args *ap) 2623 { 2624 2625 if (ap->a_vp->v_type != VREG) { 2626 /* 2627 * For NFS, metadata is changed synchronously on the server, 2628 * so there is nothing to flush. Also, ncl_flush() clears 2629 * the NMODIFIED flag and that shouldn't be done here for 2630 * directories. 2631 */ 2632 return (0); 2633 } 2634 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0)); 2635 } 2636 2637 /* 2638 * Flush all the blocks associated with a vnode. 2639 * Walk through the buffer pool and push any dirty pages 2640 * associated with the vnode. 2641 * If the called_from_renewthread argument is TRUE, it has been called 2642 * from the NFSv4 renew thread and, as such, cannot block indefinitely 2643 * waiting for a buffer write to complete. 2644 */ 2645 int 2646 ncl_flush(struct vnode *vp, int waitfor, struct thread *td, 2647 int commit, int called_from_renewthread) 2648 { 2649 struct nfsnode *np = VTONFS(vp); 2650 struct buf *bp; 2651 int i; 2652 struct buf *nbp; 2653 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2654 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2655 int passone = 1, trycnt = 0; 2656 u_quad_t off, endoff, toff; 2657 struct ucred* wcred = NULL; 2658 struct buf **bvec = NULL; 2659 struct bufobj *bo; 2660 #ifndef NFS_COMMITBVECSIZ 2661 #define NFS_COMMITBVECSIZ 20 2662 #endif 2663 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2664 int bvecsize = 0, bveccount; 2665 2666 if (called_from_renewthread != 0) 2667 slptimeo = hz; 2668 if (nmp->nm_flag & NFSMNT_INT) 2669 slpflag = PCATCH; 2670 if (!commit) 2671 passone = 0; 2672 bo = &vp->v_bufobj; 2673 /* 2674 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2675 * server, but has not been committed to stable storage on the server 2676 * yet. On the first pass, the byte range is worked out and the commit 2677 * rpc is done. On the second pass, ncl_writebp() is called to do the 2678 * job. 2679 */ 2680 again: 2681 off = (u_quad_t)-1; 2682 endoff = 0; 2683 bvecpos = 0; 2684 if (NFS_ISV34(vp) && commit) { 2685 if (bvec != NULL && bvec != bvec_on_stack) 2686 free(bvec, M_TEMP); 2687 /* 2688 * Count up how many buffers waiting for a commit. 2689 */ 2690 bveccount = 0; 2691 BO_LOCK(bo); 2692 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2693 if (!BUF_ISLOCKED(bp) && 2694 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2695 == (B_DELWRI | B_NEEDCOMMIT)) 2696 bveccount++; 2697 } 2698 /* 2699 * Allocate space to remember the list of bufs to commit. It is 2700 * important to use M_NOWAIT here to avoid a race with nfs_write. 2701 * If we can't get memory (for whatever reason), we will end up 2702 * committing the buffers one-by-one in the loop below. 2703 */ 2704 if (bveccount > NFS_COMMITBVECSIZ) { 2705 /* 2706 * Release the vnode interlock to avoid a lock 2707 * order reversal. 2708 */ 2709 BO_UNLOCK(bo); 2710 bvec = (struct buf **) 2711 malloc(bveccount * sizeof(struct buf *), 2712 M_TEMP, M_NOWAIT); 2713 BO_LOCK(bo); 2714 if (bvec == NULL) { 2715 bvec = bvec_on_stack; 2716 bvecsize = NFS_COMMITBVECSIZ; 2717 } else 2718 bvecsize = bveccount; 2719 } else { 2720 bvec = bvec_on_stack; 2721 bvecsize = NFS_COMMITBVECSIZ; 2722 } 2723 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2724 if (bvecpos >= bvecsize) 2725 break; 2726 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2727 nbp = TAILQ_NEXT(bp, b_bobufs); 2728 continue; 2729 } 2730 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2731 (B_DELWRI | B_NEEDCOMMIT)) { 2732 BUF_UNLOCK(bp); 2733 nbp = TAILQ_NEXT(bp, b_bobufs); 2734 continue; 2735 } 2736 BO_UNLOCK(bo); 2737 bremfree(bp); 2738 /* 2739 * Work out if all buffers are using the same cred 2740 * so we can deal with them all with one commit. 2741 * 2742 * NOTE: we are not clearing B_DONE here, so we have 2743 * to do it later on in this routine if we intend to 2744 * initiate I/O on the bp. 2745 * 2746 * Note: to avoid loopback deadlocks, we do not 2747 * assign b_runningbufspace. 2748 */ 2749 if (wcred == NULL) 2750 wcred = bp->b_wcred; 2751 else if (wcred != bp->b_wcred) 2752 wcred = NOCRED; 2753 vfs_busy_pages(bp, 1); 2754 2755 BO_LOCK(bo); 2756 /* 2757 * bp is protected by being locked, but nbp is not 2758 * and vfs_busy_pages() may sleep. We have to 2759 * recalculate nbp. 2760 */ 2761 nbp = TAILQ_NEXT(bp, b_bobufs); 2762 2763 /* 2764 * A list of these buffers is kept so that the 2765 * second loop knows which buffers have actually 2766 * been committed. This is necessary, since there 2767 * may be a race between the commit rpc and new 2768 * uncommitted writes on the file. 2769 */ 2770 bvec[bvecpos++] = bp; 2771 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2772 bp->b_dirtyoff; 2773 if (toff < off) 2774 off = toff; 2775 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 2776 if (toff > endoff) 2777 endoff = toff; 2778 } 2779 BO_UNLOCK(bo); 2780 } 2781 if (bvecpos > 0) { 2782 /* 2783 * Commit data on the server, as required. 2784 * If all bufs are using the same wcred, then use that with 2785 * one call for all of them, otherwise commit each one 2786 * separately. 2787 */ 2788 if (wcred != NOCRED) 2789 retv = ncl_commit(vp, off, (int)(endoff - off), 2790 wcred, td); 2791 else { 2792 retv = 0; 2793 for (i = 0; i < bvecpos; i++) { 2794 off_t off, size; 2795 bp = bvec[i]; 2796 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2797 bp->b_dirtyoff; 2798 size = (u_quad_t)(bp->b_dirtyend 2799 - bp->b_dirtyoff); 2800 retv = ncl_commit(vp, off, (int)size, 2801 bp->b_wcred, td); 2802 if (retv) break; 2803 } 2804 } 2805 2806 if (retv == NFSERR_STALEWRITEVERF) 2807 ncl_clearcommit(vp->v_mount); 2808 2809 /* 2810 * Now, either mark the blocks I/O done or mark the 2811 * blocks dirty, depending on whether the commit 2812 * succeeded. 2813 */ 2814 for (i = 0; i < bvecpos; i++) { 2815 bp = bvec[i]; 2816 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 2817 if (retv) { 2818 /* 2819 * Error, leave B_DELWRI intact 2820 */ 2821 vfs_unbusy_pages(bp); 2822 brelse(bp); 2823 } else { 2824 /* 2825 * Success, remove B_DELWRI ( bundirty() ). 2826 * 2827 * b_dirtyoff/b_dirtyend seem to be NFS 2828 * specific. We should probably move that 2829 * into bundirty(). XXX 2830 */ 2831 bufobj_wref(bo); 2832 bp->b_flags |= B_ASYNC; 2833 bundirty(bp); 2834 bp->b_flags &= ~B_DONE; 2835 bp->b_ioflags &= ~BIO_ERROR; 2836 bp->b_dirtyoff = bp->b_dirtyend = 0; 2837 bufdone(bp); 2838 } 2839 } 2840 } 2841 2842 /* 2843 * Start/do any write(s) that are required. 2844 */ 2845 loop: 2846 BO_LOCK(bo); 2847 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2848 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2849 if (waitfor != MNT_WAIT || passone) 2850 continue; 2851 2852 error = BUF_TIMELOCK(bp, 2853 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 2854 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo); 2855 if (error == 0) { 2856 BUF_UNLOCK(bp); 2857 goto loop; 2858 } 2859 if (error == ENOLCK) { 2860 error = 0; 2861 goto loop; 2862 } 2863 if (called_from_renewthread != 0) { 2864 /* 2865 * Return EIO so the flush will be retried 2866 * later. 2867 */ 2868 error = EIO; 2869 goto done; 2870 } 2871 if (newnfs_sigintr(nmp, td)) { 2872 error = EINTR; 2873 goto done; 2874 } 2875 if (slpflag == PCATCH) { 2876 slpflag = 0; 2877 slptimeo = 2 * hz; 2878 } 2879 goto loop; 2880 } 2881 if ((bp->b_flags & B_DELWRI) == 0) 2882 panic("nfs_fsync: not dirty"); 2883 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 2884 BUF_UNLOCK(bp); 2885 continue; 2886 } 2887 BO_UNLOCK(bo); 2888 bremfree(bp); 2889 if (passone || !commit) 2890 bp->b_flags |= B_ASYNC; 2891 else 2892 bp->b_flags |= B_ASYNC; 2893 bwrite(bp); 2894 if (newnfs_sigintr(nmp, td)) { 2895 error = EINTR; 2896 goto done; 2897 } 2898 goto loop; 2899 } 2900 if (passone) { 2901 passone = 0; 2902 BO_UNLOCK(bo); 2903 goto again; 2904 } 2905 if (waitfor == MNT_WAIT) { 2906 while (bo->bo_numoutput) { 2907 error = bufobj_wwait(bo, slpflag, slptimeo); 2908 if (error) { 2909 BO_UNLOCK(bo); 2910 if (called_from_renewthread != 0) { 2911 /* 2912 * Return EIO so that the flush will be 2913 * retried later. 2914 */ 2915 error = EIO; 2916 goto done; 2917 } 2918 error = newnfs_sigintr(nmp, td); 2919 if (error) 2920 goto done; 2921 if (slpflag == PCATCH) { 2922 slpflag = 0; 2923 slptimeo = 2 * hz; 2924 } 2925 BO_LOCK(bo); 2926 } 2927 } 2928 if (bo->bo_dirty.bv_cnt != 0 && commit) { 2929 BO_UNLOCK(bo); 2930 goto loop; 2931 } 2932 /* 2933 * Wait for all the async IO requests to drain 2934 */ 2935 BO_UNLOCK(bo); 2936 mtx_lock(&np->n_mtx); 2937 while (np->n_directio_asyncwr > 0) { 2938 np->n_flag |= NFSYNCWAIT; 2939 error = newnfs_msleep(td, &np->n_directio_asyncwr, 2940 &np->n_mtx, slpflag | (PRIBIO + 1), 2941 "nfsfsync", 0); 2942 if (error) { 2943 if (newnfs_sigintr(nmp, td)) { 2944 mtx_unlock(&np->n_mtx); 2945 error = EINTR; 2946 goto done; 2947 } 2948 } 2949 } 2950 mtx_unlock(&np->n_mtx); 2951 } else 2952 BO_UNLOCK(bo); 2953 if (NFSHASPNFS(nmp)) { 2954 nfscl_layoutcommit(vp, td); 2955 /* 2956 * Invalidate the attribute cache, since writes to a DS 2957 * won't update the size attribute. 2958 */ 2959 mtx_lock(&np->n_mtx); 2960 np->n_attrstamp = 0; 2961 } else 2962 mtx_lock(&np->n_mtx); 2963 if (np->n_flag & NWRITEERR) { 2964 error = np->n_error; 2965 np->n_flag &= ~NWRITEERR; 2966 } 2967 if (commit && bo->bo_dirty.bv_cnt == 0 && 2968 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) 2969 np->n_flag &= ~NMODIFIED; 2970 mtx_unlock(&np->n_mtx); 2971 done: 2972 if (bvec != NULL && bvec != bvec_on_stack) 2973 free(bvec, M_TEMP); 2974 if (error == 0 && commit != 0 && waitfor == MNT_WAIT && 2975 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 || 2976 np->n_directio_asyncwr != 0)) { 2977 if (trycnt++ < 5) { 2978 /* try, try again... */ 2979 passone = 1; 2980 wcred = NULL; 2981 bvec = NULL; 2982 bvecsize = 0; 2983 goto again; 2984 } 2985 vn_printf(vp, "ncl_flush failed"); 2986 error = called_from_renewthread != 0 ? EIO : EBUSY; 2987 } 2988 return (error); 2989 } 2990 2991 /* 2992 * NFS advisory byte-level locks. 2993 */ 2994 static int 2995 nfs_advlock(struct vop_advlock_args *ap) 2996 { 2997 struct vnode *vp = ap->a_vp; 2998 struct ucred *cred; 2999 struct nfsnode *np = VTONFS(ap->a_vp); 3000 struct proc *p = (struct proc *)ap->a_id; 3001 struct thread *td = curthread; /* XXX */ 3002 struct vattr va; 3003 int ret, error = EOPNOTSUPP; 3004 u_quad_t size; 3005 3006 if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) { 3007 if (vp->v_type != VREG) 3008 return (EINVAL); 3009 if ((ap->a_flags & F_POSIX) != 0) 3010 cred = p->p_ucred; 3011 else 3012 cred = td->td_ucred; 3013 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY); 3014 if (vp->v_iflag & VI_DOOMED) { 3015 NFSVOPUNLOCK(vp, 0); 3016 return (EBADF); 3017 } 3018 3019 /* 3020 * If this is unlocking a write locked region, flush and 3021 * commit them before unlocking. This is required by 3022 * RFC3530 Sec. 9.3.2. 3023 */ 3024 if (ap->a_op == F_UNLCK && 3025 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id, 3026 ap->a_flags)) 3027 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0); 3028 3029 /* 3030 * Loop around doing the lock op, while a blocking lock 3031 * must wait for the lock op to succeed. 3032 */ 3033 do { 3034 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op, 3035 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags); 3036 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3037 ap->a_op == F_SETLK) { 3038 NFSVOPUNLOCK(vp, 0); 3039 error = nfs_catnap(PZERO | PCATCH, ret, 3040 "ncladvl"); 3041 if (error) 3042 return (EINTR); 3043 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY); 3044 if (vp->v_iflag & VI_DOOMED) { 3045 NFSVOPUNLOCK(vp, 0); 3046 return (EBADF); 3047 } 3048 } 3049 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3050 ap->a_op == F_SETLK); 3051 if (ret == NFSERR_DENIED) { 3052 NFSVOPUNLOCK(vp, 0); 3053 return (EAGAIN); 3054 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) { 3055 NFSVOPUNLOCK(vp, 0); 3056 return (ret); 3057 } else if (ret != 0) { 3058 NFSVOPUNLOCK(vp, 0); 3059 return (EACCES); 3060 } 3061 3062 /* 3063 * Now, if we just got a lock, invalidate data in the buffer 3064 * cache, as required, so that the coherency conforms with 3065 * RFC3530 Sec. 9.3.2. 3066 */ 3067 if (ap->a_op == F_SETLK) { 3068 if ((np->n_flag & NMODIFIED) == 0) { 3069 np->n_attrstamp = 0; 3070 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3071 ret = VOP_GETATTR(vp, &va, cred); 3072 } 3073 if ((np->n_flag & NMODIFIED) || ret || 3074 np->n_change != va.va_filerev) { 3075 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1); 3076 if ((vp->v_iflag & VI_DOOMED) != 0) { 3077 NFSVOPUNLOCK(vp, 0); 3078 return (EBADF); 3079 } 3080 np->n_attrstamp = 0; 3081 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3082 ret = VOP_GETATTR(vp, &va, cred); 3083 if (!ret) { 3084 np->n_mtime = va.va_mtime; 3085 np->n_change = va.va_filerev; 3086 } 3087 } 3088 /* Mark that a file lock has been acquired. */ 3089 mtx_lock(&np->n_mtx); 3090 np->n_flag |= NHASBEENLOCKED; 3091 mtx_unlock(&np->n_mtx); 3092 } 3093 NFSVOPUNLOCK(vp, 0); 3094 return (0); 3095 } else if (!NFS_ISV4(vp)) { 3096 error = NFSVOPLOCK(vp, LK_SHARED); 3097 if (error) 3098 return (error); 3099 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3100 size = VTONFS(vp)->n_size; 3101 NFSVOPUNLOCK(vp, 0); 3102 error = lf_advlock(ap, &(vp->v_lockf), size); 3103 } else { 3104 if (nfs_advlock_p != NULL) 3105 error = nfs_advlock_p(ap); 3106 else { 3107 NFSVOPUNLOCK(vp, 0); 3108 error = ENOLCK; 3109 } 3110 } 3111 if (error == 0 && ap->a_op == F_SETLK) { 3112 error = NFSVOPLOCK(vp, LK_SHARED); 3113 if (error == 0) { 3114 /* Mark that a file lock has been acquired. */ 3115 mtx_lock(&np->n_mtx); 3116 np->n_flag |= NHASBEENLOCKED; 3117 mtx_unlock(&np->n_mtx); 3118 NFSVOPUNLOCK(vp, 0); 3119 } 3120 } 3121 } 3122 return (error); 3123 } 3124 3125 /* 3126 * NFS advisory byte-level locks. 3127 */ 3128 static int 3129 nfs_advlockasync(struct vop_advlockasync_args *ap) 3130 { 3131 struct vnode *vp = ap->a_vp; 3132 u_quad_t size; 3133 int error; 3134 3135 if (NFS_ISV4(vp)) 3136 return (EOPNOTSUPP); 3137 error = NFSVOPLOCK(vp, LK_SHARED); 3138 if (error) 3139 return (error); 3140 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3141 size = VTONFS(vp)->n_size; 3142 NFSVOPUNLOCK(vp, 0); 3143 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3144 } else { 3145 NFSVOPUNLOCK(vp, 0); 3146 error = EOPNOTSUPP; 3147 } 3148 return (error); 3149 } 3150 3151 /* 3152 * Print out the contents of an nfsnode. 3153 */ 3154 static int 3155 nfs_print(struct vop_print_args *ap) 3156 { 3157 struct vnode *vp = ap->a_vp; 3158 struct nfsnode *np = VTONFS(vp); 3159 3160 printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid, 3161 (uintmax_t)np->n_vattr.na_fsid); 3162 if (vp->v_type == VFIFO) 3163 fifo_printinfo(vp); 3164 printf("\n"); 3165 return (0); 3166 } 3167 3168 /* 3169 * This is the "real" nfs::bwrite(struct buf*). 3170 * We set B_CACHE if this is a VMIO buffer. 3171 */ 3172 int 3173 ncl_writebp(struct buf *bp, int force __unused, struct thread *td) 3174 { 3175 int oldflags, rtval; 3176 3177 BUF_ASSERT_HELD(bp); 3178 3179 if (bp->b_flags & B_INVAL) { 3180 brelse(bp); 3181 return (0); 3182 } 3183 3184 oldflags = bp->b_flags; 3185 bp->b_flags |= B_CACHE; 3186 3187 /* 3188 * Undirty the bp. We will redirty it later if the I/O fails. 3189 */ 3190 bundirty(bp); 3191 bp->b_flags &= ~B_DONE; 3192 bp->b_ioflags &= ~BIO_ERROR; 3193 bp->b_iocmd = BIO_WRITE; 3194 3195 bufobj_wref(bp->b_bufobj); 3196 curthread->td_ru.ru_oublock++; 3197 3198 /* 3199 * Note: to avoid loopback deadlocks, we do not 3200 * assign b_runningbufspace. 3201 */ 3202 vfs_busy_pages(bp, 1); 3203 3204 BUF_KERNPROC(bp); 3205 bp->b_iooffset = dbtob(bp->b_blkno); 3206 bstrategy(bp); 3207 3208 if ((oldflags & B_ASYNC) != 0) 3209 return (0); 3210 3211 rtval = bufwait(bp); 3212 if (oldflags & B_DELWRI) 3213 reassignbuf(bp); 3214 brelse(bp); 3215 return (rtval); 3216 } 3217 3218 /* 3219 * nfs special file access vnode op. 3220 * Essentially just get vattr and then imitate iaccess() since the device is 3221 * local to the client. 3222 */ 3223 static int 3224 nfsspec_access(struct vop_access_args *ap) 3225 { 3226 struct vattr *vap; 3227 struct ucred *cred = ap->a_cred; 3228 struct vnode *vp = ap->a_vp; 3229 accmode_t accmode = ap->a_accmode; 3230 struct vattr vattr; 3231 int error; 3232 3233 /* 3234 * Disallow write attempts on filesystems mounted read-only; 3235 * unless the file is a socket, fifo, or a block or character 3236 * device resident on the filesystem. 3237 */ 3238 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3239 switch (vp->v_type) { 3240 case VREG: 3241 case VDIR: 3242 case VLNK: 3243 return (EROFS); 3244 default: 3245 break; 3246 } 3247 } 3248 vap = &vattr; 3249 error = VOP_GETATTR(vp, vap, cred); 3250 if (error) 3251 goto out; 3252 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3253 accmode, cred, NULL); 3254 out: 3255 return error; 3256 } 3257 3258 /* 3259 * Read wrapper for fifos. 3260 */ 3261 static int 3262 nfsfifo_read(struct vop_read_args *ap) 3263 { 3264 struct nfsnode *np = VTONFS(ap->a_vp); 3265 int error; 3266 3267 /* 3268 * Set access flag. 3269 */ 3270 mtx_lock(&np->n_mtx); 3271 np->n_flag |= NACC; 3272 vfs_timestamp(&np->n_atim); 3273 mtx_unlock(&np->n_mtx); 3274 error = fifo_specops.vop_read(ap); 3275 return error; 3276 } 3277 3278 /* 3279 * Write wrapper for fifos. 3280 */ 3281 static int 3282 nfsfifo_write(struct vop_write_args *ap) 3283 { 3284 struct nfsnode *np = VTONFS(ap->a_vp); 3285 3286 /* 3287 * Set update flag. 3288 */ 3289 mtx_lock(&np->n_mtx); 3290 np->n_flag |= NUPD; 3291 vfs_timestamp(&np->n_mtim); 3292 mtx_unlock(&np->n_mtx); 3293 return(fifo_specops.vop_write(ap)); 3294 } 3295 3296 /* 3297 * Close wrapper for fifos. 3298 * 3299 * Update the times on the nfsnode then do fifo close. 3300 */ 3301 static int 3302 nfsfifo_close(struct vop_close_args *ap) 3303 { 3304 struct vnode *vp = ap->a_vp; 3305 struct nfsnode *np = VTONFS(vp); 3306 struct vattr vattr; 3307 struct timespec ts; 3308 3309 mtx_lock(&np->n_mtx); 3310 if (np->n_flag & (NACC | NUPD)) { 3311 vfs_timestamp(&ts); 3312 if (np->n_flag & NACC) 3313 np->n_atim = ts; 3314 if (np->n_flag & NUPD) 3315 np->n_mtim = ts; 3316 np->n_flag |= NCHG; 3317 if (vrefcnt(vp) == 1 && 3318 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3319 VATTR_NULL(&vattr); 3320 if (np->n_flag & NACC) 3321 vattr.va_atime = np->n_atim; 3322 if (np->n_flag & NUPD) 3323 vattr.va_mtime = np->n_mtim; 3324 mtx_unlock(&np->n_mtx); 3325 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3326 goto out; 3327 } 3328 } 3329 mtx_unlock(&np->n_mtx); 3330 out: 3331 return (fifo_specops.vop_close(ap)); 3332 } 3333 3334 /* 3335 * Just call ncl_writebp() with the force argument set to 1. 3336 * 3337 * NOTE: B_DONE may or may not be set in a_bp on call. 3338 */ 3339 static int 3340 nfs_bwrite(struct buf *bp) 3341 { 3342 3343 return (ncl_writebp(bp, 1, curthread)); 3344 } 3345 3346 struct buf_ops buf_ops_newnfs = { 3347 .bop_name = "buf_ops_nfs", 3348 .bop_write = nfs_bwrite, 3349 .bop_strategy = bufstrategy, 3350 .bop_sync = bufsync, 3351 .bop_bdflush = bufbdflush, 3352 }; 3353 3354 static int 3355 nfs_getacl(struct vop_getacl_args *ap) 3356 { 3357 int error; 3358 3359 if (ap->a_type != ACL_TYPE_NFS4) 3360 return (EOPNOTSUPP); 3361 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3362 NULL); 3363 if (error > NFSERR_STALE) { 3364 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3365 error = EPERM; 3366 } 3367 return (error); 3368 } 3369 3370 static int 3371 nfs_setacl(struct vop_setacl_args *ap) 3372 { 3373 int error; 3374 3375 if (ap->a_type != ACL_TYPE_NFS4) 3376 return (EOPNOTSUPP); 3377 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3378 NULL); 3379 if (error > NFSERR_STALE) { 3380 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3381 error = EPERM; 3382 } 3383 return (error); 3384 } 3385 3386 static int 3387 nfs_set_text(struct vop_set_text_args *ap) 3388 { 3389 struct vnode *vp = ap->a_vp; 3390 struct nfsnode *np; 3391 3392 /* 3393 * If the text file has been mmap'd, flush any dirty pages to the 3394 * buffer cache and then... 3395 * Make sure all writes are pushed to the NFS server. If this is not 3396 * done, the modify time of the file can change while the text 3397 * file is being executed. This will cause the process that is 3398 * executing the text file to be terminated. 3399 */ 3400 if (vp->v_object != NULL) { 3401 VM_OBJECT_WLOCK(vp->v_object); 3402 vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC); 3403 VM_OBJECT_WUNLOCK(vp->v_object); 3404 } 3405 3406 /* Now, flush the buffer cache. */ 3407 ncl_flush(vp, MNT_WAIT, curthread, 0, 0); 3408 3409 /* And, finally, make sure that n_mtime is up to date. */ 3410 np = VTONFS(vp); 3411 mtx_lock(&np->n_mtx); 3412 np->n_mtime = np->n_vattr.na_mtime; 3413 mtx_unlock(&np->n_mtx); 3414 3415 vp->v_vflag |= VV_TEXT; 3416 return (0); 3417 } 3418 3419 /* 3420 * Return POSIX pathconf information applicable to nfs filesystems. 3421 */ 3422 static int 3423 nfs_pathconf(struct vop_pathconf_args *ap) 3424 { 3425 struct nfsv3_pathconf pc; 3426 struct nfsvattr nfsva; 3427 struct vnode *vp = ap->a_vp; 3428 struct thread *td = curthread; 3429 int attrflag, error; 3430 3431 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX || 3432 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED || 3433 ap->a_name == _PC_NO_TRUNC)) || 3434 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) { 3435 /* 3436 * Since only the above 4 a_names are returned by the NFSv3 3437 * Pathconf RPC, there is no point in doing it for others. 3438 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can 3439 * be used for _PC_NFS4_ACL as well. 3440 */ 3441 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva, 3442 &attrflag, NULL); 3443 if (attrflag != 0) 3444 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 3445 1); 3446 if (error != 0) 3447 return (error); 3448 } else { 3449 /* 3450 * For NFSv2 (or NFSv3 when not one of the above 4 a_names), 3451 * just fake them. 3452 */ 3453 pc.pc_linkmax = LINK_MAX; 3454 pc.pc_namemax = NFS_MAXNAMLEN; 3455 pc.pc_notrunc = 1; 3456 pc.pc_chownrestricted = 1; 3457 pc.pc_caseinsensitive = 0; 3458 pc.pc_casepreserving = 1; 3459 error = 0; 3460 } 3461 switch (ap->a_name) { 3462 case _PC_LINK_MAX: 3463 *ap->a_retval = pc.pc_linkmax; 3464 break; 3465 case _PC_NAME_MAX: 3466 *ap->a_retval = pc.pc_namemax; 3467 break; 3468 case _PC_PATH_MAX: 3469 *ap->a_retval = PATH_MAX; 3470 break; 3471 case _PC_PIPE_BUF: 3472 *ap->a_retval = PIPE_BUF; 3473 break; 3474 case _PC_CHOWN_RESTRICTED: 3475 *ap->a_retval = pc.pc_chownrestricted; 3476 break; 3477 case _PC_NO_TRUNC: 3478 *ap->a_retval = pc.pc_notrunc; 3479 break; 3480 case _PC_ACL_EXTENDED: 3481 *ap->a_retval = 0; 3482 break; 3483 case _PC_ACL_NFS4: 3484 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 && 3485 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL)) 3486 *ap->a_retval = 1; 3487 else 3488 *ap->a_retval = 0; 3489 break; 3490 case _PC_ACL_PATH_MAX: 3491 if (NFS_ISV4(vp)) 3492 *ap->a_retval = ACL_MAX_ENTRIES; 3493 else 3494 *ap->a_retval = 3; 3495 break; 3496 case _PC_MAC_PRESENT: 3497 *ap->a_retval = 0; 3498 break; 3499 case _PC_ASYNC_IO: 3500 /* _PC_ASYNC_IO should have been handled by upper layers. */ 3501 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 3502 error = EINVAL; 3503 break; 3504 case _PC_PRIO_IO: 3505 *ap->a_retval = 0; 3506 break; 3507 case _PC_SYNC_IO: 3508 *ap->a_retval = 0; 3509 break; 3510 case _PC_ALLOC_SIZE_MIN: 3511 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize; 3512 break; 3513 case _PC_FILESIZEBITS: 3514 if (NFS_ISV34(vp)) 3515 *ap->a_retval = 64; 3516 else 3517 *ap->a_retval = 32; 3518 break; 3519 case _PC_REC_INCR_XFER_SIZE: 3520 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 3521 break; 3522 case _PC_REC_MAX_XFER_SIZE: 3523 *ap->a_retval = -1; /* means ``unlimited'' */ 3524 break; 3525 case _PC_REC_MIN_XFER_SIZE: 3526 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 3527 break; 3528 case _PC_REC_XFER_ALIGN: 3529 *ap->a_retval = PAGE_SIZE; 3530 break; 3531 case _PC_SYMLINK_MAX: 3532 *ap->a_retval = NFS_MAXPATHLEN; 3533 break; 3534 3535 default: 3536 error = EINVAL; 3537 break; 3538 } 3539 return (error); 3540 } 3541
Cache object: 53c3fdd20b9dbf286bc0ad49148d1d9c
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