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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/10.1/sys/fs/nfsclient/nfs_clvnops.c 269283 2014-07-30 03:56:17Z kib $"); 37 38 /* 39 * vnode op calls for Sun NFS version 2, 3 and 4 40 */ 41 42 #include "opt_kdtrace.h" 43 #include "opt_inet.h" 44 45 #include <sys/param.h> 46 #include <sys/kernel.h> 47 #include <sys/systm.h> 48 #include <sys/resourcevar.h> 49 #include <sys/proc.h> 50 #include <sys/mount.h> 51 #include <sys/bio.h> 52 #include <sys/buf.h> 53 #include <sys/jail.h> 54 #include <sys/malloc.h> 55 #include <sys/mbuf.h> 56 #include <sys/namei.h> 57 #include <sys/socket.h> 58 #include <sys/vnode.h> 59 #include <sys/dirent.h> 60 #include <sys/fcntl.h> 61 #include <sys/lockf.h> 62 #include <sys/stat.h> 63 #include <sys/sysctl.h> 64 #include <sys/signalvar.h> 65 66 #include <vm/vm.h> 67 #include <vm/vm_extern.h> 68 #include <vm/vm_object.h> 69 70 #include <fs/nfs/nfsport.h> 71 #include <fs/nfsclient/nfsnode.h> 72 #include <fs/nfsclient/nfsmount.h> 73 #include <fs/nfsclient/nfs.h> 74 #include <fs/nfsclient/nfs_kdtrace.h> 75 76 #include <net/if.h> 77 #include <netinet/in.h> 78 #include <netinet/in_var.h> 79 80 #include <nfs/nfs_lock.h> 81 82 #ifdef KDTRACE_HOOKS 83 #include <sys/dtrace_bsd.h> 84 85 dtrace_nfsclient_accesscache_flush_probe_func_t 86 dtrace_nfscl_accesscache_flush_done_probe; 87 uint32_t nfscl_accesscache_flush_done_id; 88 89 dtrace_nfsclient_accesscache_get_probe_func_t 90 dtrace_nfscl_accesscache_get_hit_probe, 91 dtrace_nfscl_accesscache_get_miss_probe; 92 uint32_t nfscl_accesscache_get_hit_id; 93 uint32_t nfscl_accesscache_get_miss_id; 94 95 dtrace_nfsclient_accesscache_load_probe_func_t 96 dtrace_nfscl_accesscache_load_done_probe; 97 uint32_t nfscl_accesscache_load_done_id; 98 #endif /* !KDTRACE_HOOKS */ 99 100 /* Defs */ 101 #define TRUE 1 102 #define FALSE 0 103 104 extern struct nfsstats newnfsstats; 105 extern int nfsrv_useacl; 106 extern int nfscl_debuglevel; 107 MALLOC_DECLARE(M_NEWNFSREQ); 108 109 /* 110 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these 111 * calls are not in getblk() and brelse() so that they would not be necessary 112 * here. 113 */ 114 #ifndef B_VMIO 115 #define vfs_busy_pages(bp, f) 116 #endif 117 118 static vop_read_t nfsfifo_read; 119 static vop_write_t nfsfifo_write; 120 static vop_close_t nfsfifo_close; 121 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *, 122 struct thread *); 123 static vop_lookup_t nfs_lookup; 124 static vop_create_t nfs_create; 125 static vop_mknod_t nfs_mknod; 126 static vop_open_t nfs_open; 127 static vop_pathconf_t nfs_pathconf; 128 static vop_close_t nfs_close; 129 static vop_access_t nfs_access; 130 static vop_getattr_t nfs_getattr; 131 static vop_setattr_t nfs_setattr; 132 static vop_read_t nfs_read; 133 static vop_fsync_t nfs_fsync; 134 static vop_remove_t nfs_remove; 135 static vop_link_t nfs_link; 136 static vop_rename_t nfs_rename; 137 static vop_mkdir_t nfs_mkdir; 138 static vop_rmdir_t nfs_rmdir; 139 static vop_symlink_t nfs_symlink; 140 static vop_readdir_t nfs_readdir; 141 static vop_strategy_t nfs_strategy; 142 static vop_lock1_t nfs_lock1; 143 static int nfs_lookitup(struct vnode *, char *, int, 144 struct ucred *, struct thread *, struct nfsnode **); 145 static int nfs_sillyrename(struct vnode *, struct vnode *, 146 struct componentname *); 147 static vop_access_t nfsspec_access; 148 static vop_readlink_t nfs_readlink; 149 static vop_print_t nfs_print; 150 static vop_advlock_t nfs_advlock; 151 static vop_advlockasync_t nfs_advlockasync; 152 static vop_getacl_t nfs_getacl; 153 static vop_setacl_t nfs_setacl; 154 155 /* 156 * Global vfs data structures for nfs 157 */ 158 struct vop_vector newnfs_vnodeops = { 159 .vop_default = &default_vnodeops, 160 .vop_access = nfs_access, 161 .vop_advlock = nfs_advlock, 162 .vop_advlockasync = nfs_advlockasync, 163 .vop_close = nfs_close, 164 .vop_create = nfs_create, 165 .vop_fsync = nfs_fsync, 166 .vop_getattr = nfs_getattr, 167 .vop_getpages = ncl_getpages, 168 .vop_putpages = ncl_putpages, 169 .vop_inactive = ncl_inactive, 170 .vop_link = nfs_link, 171 .vop_lock1 = nfs_lock1, 172 .vop_lookup = nfs_lookup, 173 .vop_mkdir = nfs_mkdir, 174 .vop_mknod = nfs_mknod, 175 .vop_open = nfs_open, 176 .vop_pathconf = nfs_pathconf, 177 .vop_print = nfs_print, 178 .vop_read = nfs_read, 179 .vop_readdir = nfs_readdir, 180 .vop_readlink = nfs_readlink, 181 .vop_reclaim = ncl_reclaim, 182 .vop_remove = nfs_remove, 183 .vop_rename = nfs_rename, 184 .vop_rmdir = nfs_rmdir, 185 .vop_setattr = nfs_setattr, 186 .vop_strategy = nfs_strategy, 187 .vop_symlink = nfs_symlink, 188 .vop_write = ncl_write, 189 .vop_getacl = nfs_getacl, 190 .vop_setacl = nfs_setacl, 191 }; 192 193 struct vop_vector newnfs_fifoops = { 194 .vop_default = &fifo_specops, 195 .vop_access = nfsspec_access, 196 .vop_close = nfsfifo_close, 197 .vop_fsync = nfs_fsync, 198 .vop_getattr = nfs_getattr, 199 .vop_inactive = ncl_inactive, 200 .vop_print = nfs_print, 201 .vop_read = nfsfifo_read, 202 .vop_reclaim = ncl_reclaim, 203 .vop_setattr = nfs_setattr, 204 .vop_write = nfsfifo_write, 205 }; 206 207 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 208 struct componentname *cnp, struct vattr *vap); 209 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 210 int namelen, struct ucred *cred, struct thread *td); 211 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, 212 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp, 213 char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td); 214 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp, 215 struct componentname *scnp, struct sillyrename *sp); 216 217 /* 218 * Global variables 219 */ 220 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1)) 221 222 SYSCTL_DECL(_vfs_nfs); 223 224 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 225 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 226 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 227 228 static int nfs_prime_access_cache = 0; 229 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW, 230 &nfs_prime_access_cache, 0, 231 "Prime NFS ACCESS cache when fetching attributes"); 232 233 static int newnfs_commit_on_close = 0; 234 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW, 235 &newnfs_commit_on_close, 0, "write+commit on close, else only write"); 236 237 static int nfs_clean_pages_on_close = 1; 238 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, 239 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); 240 241 int newnfs_directio_enable = 0; 242 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 243 &newnfs_directio_enable, 0, "Enable NFS directio"); 244 245 int nfs_keep_dirty_on_error; 246 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW, 247 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned"); 248 249 /* 250 * This sysctl allows other processes to mmap a file that has been opened 251 * O_DIRECT by a process. In general, having processes mmap the file while 252 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 253 * this by default to prevent DoS attacks - to prevent a malicious user from 254 * opening up files O_DIRECT preventing other users from mmap'ing these 255 * files. "Protected" environments where stricter consistency guarantees are 256 * required can disable this knob. The process that opened the file O_DIRECT 257 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 258 * meaningful. 259 */ 260 int newnfs_directio_allow_mmap = 1; 261 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 262 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 263 264 #if 0 265 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 266 &newnfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 267 268 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 269 &newnfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 270 #endif 271 272 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \ 273 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \ 274 | NFSACCESS_DELETE | NFSACCESS_LOOKUP) 275 276 /* 277 * SMP Locking Note : 278 * The list of locks after the description of the lock is the ordering 279 * of other locks acquired with the lock held. 280 * np->n_mtx : Protects the fields in the nfsnode. 281 VM Object Lock 282 VI_MTX (acquired indirectly) 283 * nmp->nm_mtx : Protects the fields in the nfsmount. 284 rep->r_mtx 285 * ncl_iod_mutex : Global lock, protects shared nfsiod state. 286 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. 287 nmp->nm_mtx 288 rep->r_mtx 289 * rep->r_mtx : Protects the fields in an nfsreq. 290 */ 291 292 static int 293 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td, 294 struct ucred *cred, u_int32_t *retmode) 295 { 296 int error = 0, attrflag, i, lrupos; 297 u_int32_t rmode; 298 struct nfsnode *np = VTONFS(vp); 299 struct nfsvattr nfsva; 300 301 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag, 302 &rmode, NULL); 303 if (attrflag) 304 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 305 if (!error) { 306 lrupos = 0; 307 mtx_lock(&np->n_mtx); 308 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 309 if (np->n_accesscache[i].uid == cred->cr_uid) { 310 np->n_accesscache[i].mode = rmode; 311 np->n_accesscache[i].stamp = time_second; 312 break; 313 } 314 if (i > 0 && np->n_accesscache[i].stamp < 315 np->n_accesscache[lrupos].stamp) 316 lrupos = i; 317 } 318 if (i == NFS_ACCESSCACHESIZE) { 319 np->n_accesscache[lrupos].uid = cred->cr_uid; 320 np->n_accesscache[lrupos].mode = rmode; 321 np->n_accesscache[lrupos].stamp = time_second; 322 } 323 mtx_unlock(&np->n_mtx); 324 if (retmode != NULL) 325 *retmode = rmode; 326 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0); 327 } else if (NFS_ISV4(vp)) { 328 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 329 } 330 #ifdef KDTRACE_HOOKS 331 if (error != 0) 332 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0, 333 error); 334 #endif 335 return (error); 336 } 337 338 /* 339 * nfs access vnode op. 340 * For nfs version 2, just return ok. File accesses may fail later. 341 * For nfs version 3, use the access rpc to check accessibility. If file modes 342 * are changed on the server, accesses might still fail later. 343 */ 344 static int 345 nfs_access(struct vop_access_args *ap) 346 { 347 struct vnode *vp = ap->a_vp; 348 int error = 0, i, gotahit; 349 u_int32_t mode, wmode, rmode; 350 int v34 = NFS_ISV34(vp); 351 struct nfsnode *np = VTONFS(vp); 352 353 /* 354 * Disallow write attempts on filesystems mounted read-only; 355 * unless the file is a socket, fifo, or a block or character 356 * device resident on the filesystem. 357 */ 358 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS | 359 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL | 360 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) { 361 switch (vp->v_type) { 362 case VREG: 363 case VDIR: 364 case VLNK: 365 return (EROFS); 366 default: 367 break; 368 } 369 } 370 /* 371 * For nfs v3 or v4, check to see if we have done this recently, and if 372 * so return our cached result instead of making an ACCESS call. 373 * If not, do an access rpc, otherwise you are stuck emulating 374 * ufs_access() locally using the vattr. This may not be correct, 375 * since the server may apply other access criteria such as 376 * client uid-->server uid mapping that we do not know about. 377 */ 378 if (v34) { 379 if (ap->a_accmode & VREAD) 380 mode = NFSACCESS_READ; 381 else 382 mode = 0; 383 if (vp->v_type != VDIR) { 384 if (ap->a_accmode & VWRITE) 385 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 386 if (ap->a_accmode & VAPPEND) 387 mode |= NFSACCESS_EXTEND; 388 if (ap->a_accmode & VEXEC) 389 mode |= NFSACCESS_EXECUTE; 390 if (ap->a_accmode & VDELETE) 391 mode |= NFSACCESS_DELETE; 392 } else { 393 if (ap->a_accmode & VWRITE) 394 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND); 395 if (ap->a_accmode & VAPPEND) 396 mode |= NFSACCESS_EXTEND; 397 if (ap->a_accmode & VEXEC) 398 mode |= NFSACCESS_LOOKUP; 399 if (ap->a_accmode & VDELETE) 400 mode |= NFSACCESS_DELETE; 401 if (ap->a_accmode & VDELETE_CHILD) 402 mode |= NFSACCESS_MODIFY; 403 } 404 /* XXX safety belt, only make blanket request if caching */ 405 if (nfsaccess_cache_timeout > 0) { 406 wmode = NFSACCESS_READ | NFSACCESS_MODIFY | 407 NFSACCESS_EXTEND | NFSACCESS_EXECUTE | 408 NFSACCESS_DELETE | NFSACCESS_LOOKUP; 409 } else { 410 wmode = mode; 411 } 412 413 /* 414 * Does our cached result allow us to give a definite yes to 415 * this request? 416 */ 417 gotahit = 0; 418 mtx_lock(&np->n_mtx); 419 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 420 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) { 421 if (time_second < (np->n_accesscache[i].stamp 422 + nfsaccess_cache_timeout) && 423 (np->n_accesscache[i].mode & mode) == mode) { 424 NFSINCRGLOBAL(newnfsstats.accesscache_hits); 425 gotahit = 1; 426 } 427 break; 428 } 429 } 430 mtx_unlock(&np->n_mtx); 431 #ifdef KDTRACE_HOOKS 432 if (gotahit != 0) 433 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp, 434 ap->a_cred->cr_uid, mode); 435 else 436 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp, 437 ap->a_cred->cr_uid, mode); 438 #endif 439 if (gotahit == 0) { 440 /* 441 * Either a no, or a don't know. Go to the wire. 442 */ 443 NFSINCRGLOBAL(newnfsstats.accesscache_misses); 444 error = nfs34_access_otw(vp, wmode, ap->a_td, 445 ap->a_cred, &rmode); 446 if (!error && 447 (rmode & mode) != mode) 448 error = EACCES; 449 } 450 return (error); 451 } else { 452 if ((error = nfsspec_access(ap)) != 0) { 453 return (error); 454 } 455 /* 456 * Attempt to prevent a mapped root from accessing a file 457 * which it shouldn't. We try to read a byte from the file 458 * if the user is root and the file is not zero length. 459 * After calling nfsspec_access, we should have the correct 460 * file size cached. 461 */ 462 mtx_lock(&np->n_mtx); 463 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD) 464 && VTONFS(vp)->n_size > 0) { 465 struct iovec aiov; 466 struct uio auio; 467 char buf[1]; 468 469 mtx_unlock(&np->n_mtx); 470 aiov.iov_base = buf; 471 aiov.iov_len = 1; 472 auio.uio_iov = &aiov; 473 auio.uio_iovcnt = 1; 474 auio.uio_offset = 0; 475 auio.uio_resid = 1; 476 auio.uio_segflg = UIO_SYSSPACE; 477 auio.uio_rw = UIO_READ; 478 auio.uio_td = ap->a_td; 479 480 if (vp->v_type == VREG) 481 error = ncl_readrpc(vp, &auio, ap->a_cred); 482 else if (vp->v_type == VDIR) { 483 char* bp; 484 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 485 aiov.iov_base = bp; 486 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 487 error = ncl_readdirrpc(vp, &auio, ap->a_cred, 488 ap->a_td); 489 free(bp, M_TEMP); 490 } else if (vp->v_type == VLNK) 491 error = ncl_readlinkrpc(vp, &auio, ap->a_cred); 492 else 493 error = EACCES; 494 } else 495 mtx_unlock(&np->n_mtx); 496 return (error); 497 } 498 } 499 500 501 /* 502 * nfs open vnode op 503 * Check to see if the type is ok 504 * and that deletion is not in progress. 505 * For paged in text files, you will need to flush the page cache 506 * if consistency is lost. 507 */ 508 /* ARGSUSED */ 509 static int 510 nfs_open(struct vop_open_args *ap) 511 { 512 struct vnode *vp = ap->a_vp; 513 struct nfsnode *np = VTONFS(vp); 514 struct vattr vattr; 515 int error; 516 int fmode = ap->a_mode; 517 struct ucred *cred; 518 519 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 520 return (EOPNOTSUPP); 521 522 /* 523 * For NFSv4, we need to do the Open Op before cache validation, 524 * so that we conform to RFC3530 Sec. 9.3.1. 525 */ 526 if (NFS_ISV4(vp)) { 527 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td); 528 if (error) { 529 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 530 (gid_t)0); 531 return (error); 532 } 533 } 534 535 /* 536 * Now, if this Open will be doing reading, re-validate/flush the 537 * cache, so that Close/Open coherency is maintained. 538 */ 539 mtx_lock(&np->n_mtx); 540 if (np->n_flag & NMODIFIED) { 541 mtx_unlock(&np->n_mtx); 542 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 543 if (error == EINTR || error == EIO) { 544 if (NFS_ISV4(vp)) 545 (void) nfsrpc_close(vp, 0, ap->a_td); 546 return (error); 547 } 548 mtx_lock(&np->n_mtx); 549 np->n_attrstamp = 0; 550 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 551 if (vp->v_type == VDIR) 552 np->n_direofoffset = 0; 553 mtx_unlock(&np->n_mtx); 554 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 555 if (error) { 556 if (NFS_ISV4(vp)) 557 (void) nfsrpc_close(vp, 0, ap->a_td); 558 return (error); 559 } 560 mtx_lock(&np->n_mtx); 561 np->n_mtime = vattr.va_mtime; 562 if (NFS_ISV4(vp)) 563 np->n_change = vattr.va_filerev; 564 } else { 565 mtx_unlock(&np->n_mtx); 566 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 567 if (error) { 568 if (NFS_ISV4(vp)) 569 (void) nfsrpc_close(vp, 0, ap->a_td); 570 return (error); 571 } 572 mtx_lock(&np->n_mtx); 573 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) || 574 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 575 if (vp->v_type == VDIR) 576 np->n_direofoffset = 0; 577 mtx_unlock(&np->n_mtx); 578 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 579 if (error == EINTR || error == EIO) { 580 if (NFS_ISV4(vp)) 581 (void) nfsrpc_close(vp, 0, ap->a_td); 582 return (error); 583 } 584 mtx_lock(&np->n_mtx); 585 np->n_mtime = vattr.va_mtime; 586 if (NFS_ISV4(vp)) 587 np->n_change = vattr.va_filerev; 588 } 589 } 590 591 /* 592 * If the object has >= 1 O_DIRECT active opens, we disable caching. 593 */ 594 if (newnfs_directio_enable && (fmode & O_DIRECT) && 595 (vp->v_type == VREG)) { 596 if (np->n_directio_opens == 0) { 597 mtx_unlock(&np->n_mtx); 598 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 599 if (error) { 600 if (NFS_ISV4(vp)) 601 (void) nfsrpc_close(vp, 0, ap->a_td); 602 return (error); 603 } 604 mtx_lock(&np->n_mtx); 605 np->n_flag |= NNONCACHE; 606 } 607 np->n_directio_opens++; 608 } 609 610 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */ 611 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0) 612 np->n_flag |= NWRITEOPENED; 613 614 /* 615 * If this is an open for writing, capture a reference to the 616 * credentials, so they can be used by ncl_putpages(). Using 617 * these write credentials is preferable to the credentials of 618 * whatever thread happens to be doing the VOP_PUTPAGES() since 619 * the write RPCs are less likely to fail with EACCES. 620 */ 621 if ((fmode & FWRITE) != 0) { 622 cred = np->n_writecred; 623 np->n_writecred = crhold(ap->a_cred); 624 } else 625 cred = NULL; 626 mtx_unlock(&np->n_mtx); 627 628 if (cred != NULL) 629 crfree(cred); 630 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 631 return (0); 632 } 633 634 /* 635 * nfs close vnode op 636 * What an NFS client should do upon close after writing is a debatable issue. 637 * Most NFS clients push delayed writes to the server upon close, basically for 638 * two reasons: 639 * 1 - So that any write errors may be reported back to the client process 640 * doing the close system call. By far the two most likely errors are 641 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 642 * 2 - To put a worst case upper bound on cache inconsistency between 643 * multiple clients for the file. 644 * There is also a consistency problem for Version 2 of the protocol w.r.t. 645 * not being able to tell if other clients are writing a file concurrently, 646 * since there is no way of knowing if the changed modify time in the reply 647 * is only due to the write for this client. 648 * (NFS Version 3 provides weak cache consistency data in the reply that 649 * should be sufficient to detect and handle this case.) 650 * 651 * The current code does the following: 652 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 653 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 654 * or commit them (this satisfies 1 and 2 except for the 655 * case where the server crashes after this close but 656 * before the commit RPC, which is felt to be "good 657 * enough". Changing the last argument to ncl_flush() to 658 * a 1 would force a commit operation, if it is felt a 659 * commit is necessary now. 660 * for NFS Version 4 - flush the dirty buffers and commit them, if 661 * nfscl_mustflush() says this is necessary. 662 * It is necessary if there is no write delegation held, 663 * in order to satisfy open/close coherency. 664 * If the file isn't cached on local stable storage, 665 * it may be necessary in order to detect "out of space" 666 * errors from the server, if the write delegation 667 * issued by the server doesn't allow the file to grow. 668 */ 669 /* ARGSUSED */ 670 static int 671 nfs_close(struct vop_close_args *ap) 672 { 673 struct vnode *vp = ap->a_vp; 674 struct nfsnode *np = VTONFS(vp); 675 struct nfsvattr nfsva; 676 struct ucred *cred; 677 int error = 0, ret, localcred = 0; 678 int fmode = ap->a_fflag; 679 680 if ((vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF)) 681 return (0); 682 /* 683 * During shutdown, a_cred isn't valid, so just use root. 684 */ 685 if (ap->a_cred == NOCRED) { 686 cred = newnfs_getcred(); 687 localcred = 1; 688 } else { 689 cred = ap->a_cred; 690 } 691 if (vp->v_type == VREG) { 692 /* 693 * Examine and clean dirty pages, regardless of NMODIFIED. 694 * This closes a major hole in close-to-open consistency. 695 * We want to push out all dirty pages (and buffers) on 696 * close, regardless of whether they were dirtied by 697 * mmap'ed writes or via write(). 698 */ 699 if (nfs_clean_pages_on_close && vp->v_object) { 700 VM_OBJECT_WLOCK(vp->v_object); 701 vm_object_page_clean(vp->v_object, 0, 0, 0); 702 VM_OBJECT_WUNLOCK(vp->v_object); 703 } 704 mtx_lock(&np->n_mtx); 705 if (np->n_flag & NMODIFIED) { 706 mtx_unlock(&np->n_mtx); 707 if (NFS_ISV3(vp)) { 708 /* 709 * Under NFSv3 we have dirty buffers to dispose of. We 710 * must flush them to the NFS server. We have the option 711 * of waiting all the way through the commit rpc or just 712 * waiting for the initial write. The default is to only 713 * wait through the initial write so the data is in the 714 * server's cache, which is roughly similar to the state 715 * a standard disk subsystem leaves the file in on close(). 716 * 717 * We cannot clear the NMODIFIED bit in np->n_flag due to 718 * potential races with other processes, and certainly 719 * cannot clear it if we don't commit. 720 * These races occur when there is no longer the old 721 * traditional vnode locking implemented for Vnode Ops. 722 */ 723 int cm = newnfs_commit_on_close ? 1 : 0; 724 error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td, cm, 0); 725 /* np->n_flag &= ~NMODIFIED; */ 726 } else if (NFS_ISV4(vp)) { 727 if (nfscl_mustflush(vp) != 0) { 728 int cm = newnfs_commit_on_close ? 1 : 0; 729 error = ncl_flush(vp, MNT_WAIT, cred, ap->a_td, 730 cm, 0); 731 /* 732 * as above w.r.t races when clearing 733 * NMODIFIED. 734 * np->n_flag &= ~NMODIFIED; 735 */ 736 } 737 } else 738 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 739 mtx_lock(&np->n_mtx); 740 } 741 /* 742 * Invalidate the attribute cache in all cases. 743 * An open is going to fetch fresh attrs any way, other procs 744 * on this node that have file open will be forced to do an 745 * otw attr fetch, but this is safe. 746 * --> A user found that their RPC count dropped by 20% when 747 * this was commented out and I can't see any requirement 748 * for it, so I've disabled it when negative lookups are 749 * enabled. (What does this have to do with negative lookup 750 * caching? Well nothing, except it was reported by the 751 * same user that needed negative lookup caching and I wanted 752 * there to be a way to disable it to see if it 753 * is the cause of some caching/coherency issue that might 754 * crop up.) 755 */ 756 if (VFSTONFS(vp->v_mount)->nm_negnametimeo == 0) { 757 np->n_attrstamp = 0; 758 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 759 } 760 if (np->n_flag & NWRITEERR) { 761 np->n_flag &= ~NWRITEERR; 762 error = np->n_error; 763 } 764 mtx_unlock(&np->n_mtx); 765 } 766 767 if (NFS_ISV4(vp)) { 768 /* 769 * Get attributes so "change" is up to date. 770 */ 771 if (error == 0 && nfscl_mustflush(vp) != 0 && 772 vp->v_type == VREG && 773 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) == 0) { 774 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva, 775 NULL); 776 if (!ret) { 777 np->n_change = nfsva.na_filerev; 778 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 779 NULL, 0, 0); 780 } 781 } 782 783 /* 784 * and do the close. 785 */ 786 ret = nfsrpc_close(vp, 0, ap->a_td); 787 if (!error && ret) 788 error = ret; 789 if (error) 790 error = nfscl_maperr(ap->a_td, error, (uid_t)0, 791 (gid_t)0); 792 } 793 if (newnfs_directio_enable) 794 KASSERT((np->n_directio_asyncwr == 0), 795 ("nfs_close: dirty unflushed (%d) directio buffers\n", 796 np->n_directio_asyncwr)); 797 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 798 mtx_lock(&np->n_mtx); 799 KASSERT((np->n_directio_opens > 0), 800 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 801 np->n_directio_opens--; 802 if (np->n_directio_opens == 0) 803 np->n_flag &= ~NNONCACHE; 804 mtx_unlock(&np->n_mtx); 805 } 806 if (localcred) 807 NFSFREECRED(cred); 808 return (error); 809 } 810 811 /* 812 * nfs getattr call from vfs. 813 */ 814 static int 815 nfs_getattr(struct vop_getattr_args *ap) 816 { 817 struct vnode *vp = ap->a_vp; 818 struct thread *td = curthread; /* XXX */ 819 struct nfsnode *np = VTONFS(vp); 820 int error = 0; 821 struct nfsvattr nfsva; 822 struct vattr *vap = ap->a_vap; 823 struct vattr vattr; 824 825 /* 826 * Update local times for special files. 827 */ 828 mtx_lock(&np->n_mtx); 829 if (np->n_flag & (NACC | NUPD)) 830 np->n_flag |= NCHG; 831 mtx_unlock(&np->n_mtx); 832 /* 833 * First look in the cache. 834 */ 835 if (ncl_getattrcache(vp, &vattr) == 0) { 836 vap->va_type = vattr.va_type; 837 vap->va_mode = vattr.va_mode; 838 vap->va_nlink = vattr.va_nlink; 839 vap->va_uid = vattr.va_uid; 840 vap->va_gid = vattr.va_gid; 841 vap->va_fsid = vattr.va_fsid; 842 vap->va_fileid = vattr.va_fileid; 843 vap->va_size = vattr.va_size; 844 vap->va_blocksize = vattr.va_blocksize; 845 vap->va_atime = vattr.va_atime; 846 vap->va_mtime = vattr.va_mtime; 847 vap->va_ctime = vattr.va_ctime; 848 vap->va_gen = vattr.va_gen; 849 vap->va_flags = vattr.va_flags; 850 vap->va_rdev = vattr.va_rdev; 851 vap->va_bytes = vattr.va_bytes; 852 vap->va_filerev = vattr.va_filerev; 853 /* 854 * Get the local modify time for the case of a write 855 * delegation. 856 */ 857 nfscl_deleggetmodtime(vp, &vap->va_mtime); 858 return (0); 859 } 860 861 if (NFS_ISV34(vp) && nfs_prime_access_cache && 862 nfsaccess_cache_timeout > 0) { 863 NFSINCRGLOBAL(newnfsstats.accesscache_misses); 864 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL); 865 if (ncl_getattrcache(vp, ap->a_vap) == 0) { 866 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime); 867 return (0); 868 } 869 } 870 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva, NULL); 871 if (!error) 872 error = nfscl_loadattrcache(&vp, &nfsva, vap, NULL, 0, 0); 873 if (!error) { 874 /* 875 * Get the local modify time for the case of a write 876 * delegation. 877 */ 878 nfscl_deleggetmodtime(vp, &vap->va_mtime); 879 } else if (NFS_ISV4(vp)) { 880 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 881 } 882 return (error); 883 } 884 885 /* 886 * nfs setattr call. 887 */ 888 static int 889 nfs_setattr(struct vop_setattr_args *ap) 890 { 891 struct vnode *vp = ap->a_vp; 892 struct nfsnode *np = VTONFS(vp); 893 struct thread *td = curthread; /* XXX */ 894 struct vattr *vap = ap->a_vap; 895 int error = 0; 896 u_quad_t tsize; 897 898 #ifndef nolint 899 tsize = (u_quad_t)0; 900 #endif 901 902 /* 903 * Setting of flags and marking of atimes are not supported. 904 */ 905 if (vap->va_flags != VNOVAL) 906 return (EOPNOTSUPP); 907 908 /* 909 * Disallow write attempts if the filesystem is mounted read-only. 910 */ 911 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 912 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 913 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 914 (vp->v_mount->mnt_flag & MNT_RDONLY)) 915 return (EROFS); 916 if (vap->va_size != VNOVAL) { 917 switch (vp->v_type) { 918 case VDIR: 919 return (EISDIR); 920 case VCHR: 921 case VBLK: 922 case VSOCK: 923 case VFIFO: 924 if (vap->va_mtime.tv_sec == VNOVAL && 925 vap->va_atime.tv_sec == VNOVAL && 926 vap->va_mode == (mode_t)VNOVAL && 927 vap->va_uid == (uid_t)VNOVAL && 928 vap->va_gid == (gid_t)VNOVAL) 929 return (0); 930 vap->va_size = VNOVAL; 931 break; 932 default: 933 /* 934 * Disallow write attempts if the filesystem is 935 * mounted read-only. 936 */ 937 if (vp->v_mount->mnt_flag & MNT_RDONLY) 938 return (EROFS); 939 /* 940 * We run vnode_pager_setsize() early (why?), 941 * we must set np->n_size now to avoid vinvalbuf 942 * V_SAVE races that might setsize a lower 943 * value. 944 */ 945 mtx_lock(&np->n_mtx); 946 tsize = np->n_size; 947 mtx_unlock(&np->n_mtx); 948 error = ncl_meta_setsize(vp, ap->a_cred, td, 949 vap->va_size); 950 mtx_lock(&np->n_mtx); 951 if (np->n_flag & NMODIFIED) { 952 tsize = np->n_size; 953 mtx_unlock(&np->n_mtx); 954 if (vap->va_size == 0) 955 error = ncl_vinvalbuf(vp, 0, td, 1); 956 else 957 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 958 if (error) { 959 vnode_pager_setsize(vp, tsize); 960 return (error); 961 } 962 /* 963 * Call nfscl_delegmodtime() to set the modify time 964 * locally, as required. 965 */ 966 nfscl_delegmodtime(vp); 967 } else 968 mtx_unlock(&np->n_mtx); 969 /* 970 * np->n_size has already been set to vap->va_size 971 * in ncl_meta_setsize(). We must set it again since 972 * nfs_loadattrcache() could be called through 973 * ncl_meta_setsize() and could modify np->n_size. 974 */ 975 mtx_lock(&np->n_mtx); 976 np->n_vattr.na_size = np->n_size = vap->va_size; 977 mtx_unlock(&np->n_mtx); 978 }; 979 } else { 980 mtx_lock(&np->n_mtx); 981 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 982 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 983 mtx_unlock(&np->n_mtx); 984 if ((error = ncl_vinvalbuf(vp, V_SAVE, td, 1)) != 0 && 985 (error == EINTR || error == EIO)) 986 return (error); 987 } else 988 mtx_unlock(&np->n_mtx); 989 } 990 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 991 if (error && vap->va_size != VNOVAL) { 992 mtx_lock(&np->n_mtx); 993 np->n_size = np->n_vattr.na_size = tsize; 994 vnode_pager_setsize(vp, tsize); 995 mtx_unlock(&np->n_mtx); 996 } 997 return (error); 998 } 999 1000 /* 1001 * Do an nfs setattr rpc. 1002 */ 1003 static int 1004 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 1005 struct thread *td) 1006 { 1007 struct nfsnode *np = VTONFS(vp); 1008 int error, ret, attrflag, i; 1009 struct nfsvattr nfsva; 1010 1011 if (NFS_ISV34(vp)) { 1012 mtx_lock(&np->n_mtx); 1013 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) 1014 np->n_accesscache[i].stamp = 0; 1015 np->n_flag |= NDELEGMOD; 1016 mtx_unlock(&np->n_mtx); 1017 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); 1018 } 1019 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag, 1020 NULL); 1021 if (attrflag) { 1022 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1023 if (ret && !error) 1024 error = ret; 1025 } 1026 if (error && NFS_ISV4(vp)) 1027 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid); 1028 return (error); 1029 } 1030 1031 /* 1032 * nfs lookup call, one step at a time... 1033 * First look in cache 1034 * If not found, unlock the directory nfsnode and do the rpc 1035 */ 1036 static int 1037 nfs_lookup(struct vop_lookup_args *ap) 1038 { 1039 struct componentname *cnp = ap->a_cnp; 1040 struct vnode *dvp = ap->a_dvp; 1041 struct vnode **vpp = ap->a_vpp; 1042 struct mount *mp = dvp->v_mount; 1043 int flags = cnp->cn_flags; 1044 struct vnode *newvp; 1045 struct nfsmount *nmp; 1046 struct nfsnode *np, *newnp; 1047 int error = 0, attrflag, dattrflag, ltype, ncticks; 1048 struct thread *td = cnp->cn_thread; 1049 struct nfsfh *nfhp; 1050 struct nfsvattr dnfsva, nfsva; 1051 struct vattr vattr; 1052 struct timespec nctime; 1053 1054 *vpp = NULLVP; 1055 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) && 1056 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 1057 return (EROFS); 1058 if (dvp->v_type != VDIR) 1059 return (ENOTDIR); 1060 nmp = VFSTONFS(mp); 1061 np = VTONFS(dvp); 1062 1063 /* For NFSv4, wait until any remove is done. */ 1064 mtx_lock(&np->n_mtx); 1065 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) { 1066 np->n_flag |= NREMOVEWANT; 1067 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0); 1068 } 1069 mtx_unlock(&np->n_mtx); 1070 1071 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) 1072 return (error); 1073 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks); 1074 if (error > 0 && error != ENOENT) 1075 return (error); 1076 if (error == -1) { 1077 /* 1078 * Lookups of "." are special and always return the 1079 * current directory. cache_lookup() already handles 1080 * associated locking bookkeeping, etc. 1081 */ 1082 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 1083 /* XXX: Is this really correct? */ 1084 if (cnp->cn_nameiop != LOOKUP && 1085 (flags & ISLASTCN)) 1086 cnp->cn_flags |= SAVENAME; 1087 return (0); 1088 } 1089 1090 /* 1091 * We only accept a positive hit in the cache if the 1092 * change time of the file matches our cached copy. 1093 * Otherwise, we discard the cache entry and fallback 1094 * to doing a lookup RPC. We also only trust cache 1095 * entries for less than nm_nametimeo seconds. 1096 * 1097 * To better handle stale file handles and attributes, 1098 * clear the attribute cache of this node if it is a 1099 * leaf component, part of an open() call, and not 1100 * locally modified before fetching the attributes. 1101 * This should allow stale file handles to be detected 1102 * here where we can fall back to a LOOKUP RPC to 1103 * recover rather than having nfs_open() detect the 1104 * stale file handle and failing open(2) with ESTALE. 1105 */ 1106 newvp = *vpp; 1107 newnp = VTONFS(newvp); 1108 if (!(nmp->nm_flag & NFSMNT_NOCTO) && 1109 (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1110 !(newnp->n_flag & NMODIFIED)) { 1111 mtx_lock(&newnp->n_mtx); 1112 newnp->n_attrstamp = 0; 1113 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1114 mtx_unlock(&newnp->n_mtx); 1115 } 1116 if (nfscl_nodeleg(newvp, 0) == 0 || 1117 ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) && 1118 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 && 1119 timespeccmp(&vattr.va_ctime, &nctime, ==))) { 1120 NFSINCRGLOBAL(newnfsstats.lookupcache_hits); 1121 if (cnp->cn_nameiop != LOOKUP && 1122 (flags & ISLASTCN)) 1123 cnp->cn_flags |= SAVENAME; 1124 return (0); 1125 } 1126 cache_purge(newvp); 1127 if (dvp != newvp) 1128 vput(newvp); 1129 else 1130 vrele(newvp); 1131 *vpp = NULLVP; 1132 } else if (error == ENOENT) { 1133 if (dvp->v_iflag & VI_DOOMED) 1134 return (ENOENT); 1135 /* 1136 * We only accept a negative hit in the cache if the 1137 * modification time of the parent directory matches 1138 * the cached copy in the name cache entry. 1139 * Otherwise, we discard all of the negative cache 1140 * entries for this directory. We also only trust 1141 * negative cache entries for up to nm_negnametimeo 1142 * seconds. 1143 */ 1144 if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) && 1145 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && 1146 timespeccmp(&vattr.va_mtime, &nctime, ==)) { 1147 NFSINCRGLOBAL(newnfsstats.lookupcache_hits); 1148 return (ENOENT); 1149 } 1150 cache_purge_negative(dvp); 1151 } 1152 1153 error = 0; 1154 newvp = NULLVP; 1155 NFSINCRGLOBAL(newnfsstats.lookupcache_misses); 1156 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1157 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1158 NULL); 1159 if (dattrflag) 1160 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1161 if (error) { 1162 if (newvp != NULLVP) { 1163 vput(newvp); 1164 *vpp = NULLVP; 1165 } 1166 1167 if (error != ENOENT) { 1168 if (NFS_ISV4(dvp)) 1169 error = nfscl_maperr(td, error, (uid_t)0, 1170 (gid_t)0); 1171 return (error); 1172 } 1173 1174 /* The requested file was not found. */ 1175 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1176 (flags & ISLASTCN)) { 1177 /* 1178 * XXX: UFS does a full VOP_ACCESS(dvp, 1179 * VWRITE) here instead of just checking 1180 * MNT_RDONLY. 1181 */ 1182 if (mp->mnt_flag & MNT_RDONLY) 1183 return (EROFS); 1184 cnp->cn_flags |= SAVENAME; 1185 return (EJUSTRETURN); 1186 } 1187 1188 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && 1189 dattrflag) { 1190 /* 1191 * Cache the modification time of the parent 1192 * directory from the post-op attributes in 1193 * the name cache entry. The negative cache 1194 * entry will be ignored once the directory 1195 * has changed. Don't bother adding the entry 1196 * if the directory has already changed. 1197 */ 1198 mtx_lock(&np->n_mtx); 1199 if (timespeccmp(&np->n_vattr.na_mtime, 1200 &dnfsva.na_mtime, ==)) { 1201 mtx_unlock(&np->n_mtx); 1202 cache_enter_time(dvp, NULL, cnp, 1203 &dnfsva.na_mtime, NULL); 1204 } else 1205 mtx_unlock(&np->n_mtx); 1206 } 1207 return (ENOENT); 1208 } 1209 1210 /* 1211 * Handle RENAME case... 1212 */ 1213 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 1214 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1215 FREE((caddr_t)nfhp, M_NFSFH); 1216 return (EISDIR); 1217 } 1218 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1219 LK_EXCLUSIVE); 1220 if (error) 1221 return (error); 1222 newvp = NFSTOV(np); 1223 if (attrflag) 1224 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1225 0, 1); 1226 *vpp = newvp; 1227 cnp->cn_flags |= SAVENAME; 1228 return (0); 1229 } 1230 1231 if (flags & ISDOTDOT) { 1232 ltype = NFSVOPISLOCKED(dvp); 1233 error = vfs_busy(mp, MBF_NOWAIT); 1234 if (error != 0) { 1235 vfs_ref(mp); 1236 NFSVOPUNLOCK(dvp, 0); 1237 error = vfs_busy(mp, 0); 1238 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1239 vfs_rel(mp); 1240 if (error == 0 && (dvp->v_iflag & VI_DOOMED)) { 1241 vfs_unbusy(mp); 1242 error = ENOENT; 1243 } 1244 if (error != 0) 1245 return (error); 1246 } 1247 NFSVOPUNLOCK(dvp, 0); 1248 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1249 cnp->cn_lkflags); 1250 if (error == 0) 1251 newvp = NFSTOV(np); 1252 vfs_unbusy(mp); 1253 if (newvp != dvp) 1254 NFSVOPLOCK(dvp, ltype | LK_RETRY); 1255 if (dvp->v_iflag & VI_DOOMED) { 1256 if (error == 0) { 1257 if (newvp == dvp) 1258 vrele(newvp); 1259 else 1260 vput(newvp); 1261 } 1262 error = ENOENT; 1263 } 1264 if (error != 0) 1265 return (error); 1266 if (attrflag) 1267 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1268 0, 1); 1269 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) { 1270 FREE((caddr_t)nfhp, M_NFSFH); 1271 VREF(dvp); 1272 newvp = dvp; 1273 if (attrflag) 1274 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1275 0, 1); 1276 } else { 1277 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np, NULL, 1278 cnp->cn_lkflags); 1279 if (error) 1280 return (error); 1281 newvp = NFSTOV(np); 1282 if (attrflag) 1283 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1284 0, 1); 1285 else if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && 1286 !(np->n_flag & NMODIFIED)) { 1287 /* 1288 * Flush the attribute cache when opening a 1289 * leaf node to ensure that fresh attributes 1290 * are fetched in nfs_open() since we did not 1291 * fetch attributes from the LOOKUP reply. 1292 */ 1293 mtx_lock(&np->n_mtx); 1294 np->n_attrstamp = 0; 1295 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 1296 mtx_unlock(&np->n_mtx); 1297 } 1298 } 1299 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1300 cnp->cn_flags |= SAVENAME; 1301 if ((cnp->cn_flags & MAKEENTRY) && 1302 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) && 1303 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0)) 1304 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 1305 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime); 1306 *vpp = newvp; 1307 return (0); 1308 } 1309 1310 /* 1311 * nfs read call. 1312 * Just call ncl_bioread() to do the work. 1313 */ 1314 static int 1315 nfs_read(struct vop_read_args *ap) 1316 { 1317 struct vnode *vp = ap->a_vp; 1318 1319 switch (vp->v_type) { 1320 case VREG: 1321 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1322 case VDIR: 1323 return (EISDIR); 1324 default: 1325 return (EOPNOTSUPP); 1326 } 1327 } 1328 1329 /* 1330 * nfs readlink call 1331 */ 1332 static int 1333 nfs_readlink(struct vop_readlink_args *ap) 1334 { 1335 struct vnode *vp = ap->a_vp; 1336 1337 if (vp->v_type != VLNK) 1338 return (EINVAL); 1339 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1340 } 1341 1342 /* 1343 * Do a readlink rpc. 1344 * Called by ncl_doio() from below the buffer cache. 1345 */ 1346 int 1347 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1348 { 1349 int error, ret, attrflag; 1350 struct nfsvattr nfsva; 1351 1352 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva, 1353 &attrflag, NULL); 1354 if (attrflag) { 1355 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1356 if (ret && !error) 1357 error = ret; 1358 } 1359 if (error && NFS_ISV4(vp)) 1360 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1361 return (error); 1362 } 1363 1364 /* 1365 * nfs read rpc call 1366 * Ditto above 1367 */ 1368 int 1369 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1370 { 1371 int error, ret, attrflag; 1372 struct nfsvattr nfsva; 1373 struct nfsmount *nmp; 1374 1375 nmp = VFSTONFS(vnode_mount(vp)); 1376 error = EIO; 1377 attrflag = 0; 1378 if (NFSHASPNFS(nmp)) 1379 error = nfscl_doiods(vp, uiop, NULL, NULL, 1380 NFSV4OPEN_ACCESSREAD, cred, uiop->uio_td); 1381 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error); 1382 if (error != 0) 1383 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva, 1384 &attrflag, NULL); 1385 if (attrflag) { 1386 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 1387 if (ret && !error) 1388 error = ret; 1389 } 1390 if (error && NFS_ISV4(vp)) 1391 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1392 return (error); 1393 } 1394 1395 /* 1396 * nfs write call 1397 */ 1398 int 1399 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1400 int *iomode, int *must_commit, int called_from_strategy) 1401 { 1402 struct nfsvattr nfsva; 1403 int error, attrflag, ret; 1404 struct nfsmount *nmp; 1405 1406 nmp = VFSTONFS(vnode_mount(vp)); 1407 error = EIO; 1408 attrflag = 0; 1409 if (NFSHASPNFS(nmp)) 1410 error = nfscl_doiods(vp, uiop, iomode, must_commit, 1411 NFSV4OPEN_ACCESSWRITE, cred, uiop->uio_td); 1412 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error); 1413 if (error != 0) 1414 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred, 1415 uiop->uio_td, &nfsva, &attrflag, NULL, 1416 called_from_strategy); 1417 if (attrflag) { 1418 if (VTONFS(vp)->n_flag & ND_NFSV4) 1419 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 1, 1420 1); 1421 else 1422 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1423 1); 1424 if (ret && !error) 1425 error = ret; 1426 } 1427 if (DOINGASYNC(vp)) 1428 *iomode = NFSWRITE_FILESYNC; 1429 if (error && NFS_ISV4(vp)) 1430 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0); 1431 return (error); 1432 } 1433 1434 /* 1435 * nfs mknod rpc 1436 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1437 * mode set to specify the file type and the size field for rdev. 1438 */ 1439 static int 1440 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1441 struct vattr *vap) 1442 { 1443 struct nfsvattr nfsva, dnfsva; 1444 struct vnode *newvp = NULL; 1445 struct nfsnode *np = NULL, *dnp; 1446 struct nfsfh *nfhp; 1447 struct vattr vattr; 1448 int error = 0, attrflag, dattrflag; 1449 u_int32_t rdev; 1450 1451 if (vap->va_type == VCHR || vap->va_type == VBLK) 1452 rdev = vap->va_rdev; 1453 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1454 rdev = 0xffffffff; 1455 else 1456 return (EOPNOTSUPP); 1457 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1458 return (error); 1459 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap, 1460 rdev, vap->va_type, cnp->cn_cred, cnp->cn_thread, &dnfsva, 1461 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 1462 if (!error) { 1463 if (!nfhp) 1464 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1465 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, 1466 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1467 NULL); 1468 if (nfhp) 1469 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1470 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE); 1471 } 1472 if (dattrflag) 1473 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1474 if (!error) { 1475 newvp = NFSTOV(np); 1476 if (attrflag != 0) { 1477 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1478 0, 1); 1479 if (error != 0) 1480 vput(newvp); 1481 } 1482 } 1483 if (!error) { 1484 *vpp = newvp; 1485 } else if (NFS_ISV4(dvp)) { 1486 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid, 1487 vap->va_gid); 1488 } 1489 dnp = VTONFS(dvp); 1490 mtx_lock(&dnp->n_mtx); 1491 dnp->n_flag |= NMODIFIED; 1492 if (!dattrflag) { 1493 dnp->n_attrstamp = 0; 1494 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1495 } 1496 mtx_unlock(&dnp->n_mtx); 1497 return (error); 1498 } 1499 1500 /* 1501 * nfs mknod vop 1502 * just call nfs_mknodrpc() to do the work. 1503 */ 1504 /* ARGSUSED */ 1505 static int 1506 nfs_mknod(struct vop_mknod_args *ap) 1507 { 1508 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1509 } 1510 1511 static struct mtx nfs_cverf_mtx; 1512 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex", 1513 MTX_DEF); 1514 1515 static nfsquad_t 1516 nfs_get_cverf(void) 1517 { 1518 static nfsquad_t cverf; 1519 nfsquad_t ret; 1520 static int cverf_initialized = 0; 1521 1522 mtx_lock(&nfs_cverf_mtx); 1523 if (cverf_initialized == 0) { 1524 cverf.lval[0] = arc4random(); 1525 cverf.lval[1] = arc4random(); 1526 cverf_initialized = 1; 1527 } else 1528 cverf.qval++; 1529 ret = cverf; 1530 mtx_unlock(&nfs_cverf_mtx); 1531 1532 return (ret); 1533 } 1534 1535 /* 1536 * nfs file create call 1537 */ 1538 static int 1539 nfs_create(struct vop_create_args *ap) 1540 { 1541 struct vnode *dvp = ap->a_dvp; 1542 struct vattr *vap = ap->a_vap; 1543 struct componentname *cnp = ap->a_cnp; 1544 struct nfsnode *np = NULL, *dnp; 1545 struct vnode *newvp = NULL; 1546 struct nfsmount *nmp; 1547 struct nfsvattr dnfsva, nfsva; 1548 struct nfsfh *nfhp; 1549 nfsquad_t cverf; 1550 int error = 0, attrflag, dattrflag, fmode = 0; 1551 struct vattr vattr; 1552 1553 /* 1554 * Oops, not for me.. 1555 */ 1556 if (vap->va_type == VSOCK) 1557 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1558 1559 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred))) 1560 return (error); 1561 if (vap->va_vaflags & VA_EXCLUSIVE) 1562 fmode |= O_EXCL; 1563 dnp = VTONFS(dvp); 1564 nmp = VFSTONFS(vnode_mount(dvp)); 1565 again: 1566 /* For NFSv4, wait until any remove is done. */ 1567 mtx_lock(&dnp->n_mtx); 1568 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) { 1569 dnp->n_flag |= NREMOVEWANT; 1570 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0); 1571 } 1572 mtx_unlock(&dnp->n_mtx); 1573 1574 cverf = nfs_get_cverf(); 1575 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1576 vap, cverf, fmode, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, 1577 &nfhp, &attrflag, &dattrflag, NULL); 1578 if (!error) { 1579 if (nfhp == NULL) 1580 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr, 1581 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, 1582 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 1583 NULL); 1584 if (nfhp != NULL) 1585 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, 1586 cnp->cn_thread, &np, NULL, LK_EXCLUSIVE); 1587 } 1588 if (dattrflag) 1589 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1590 if (!error) { 1591 newvp = NFSTOV(np); 1592 if (attrflag == 0) 1593 error = nfsrpc_getattr(newvp, cnp->cn_cred, 1594 cnp->cn_thread, &nfsva, NULL); 1595 if (error == 0) 1596 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 1597 0, 1); 1598 } 1599 if (error) { 1600 if (newvp != NULL) { 1601 vput(newvp); 1602 newvp = NULL; 1603 } 1604 if (NFS_ISV34(dvp) && (fmode & O_EXCL) && 1605 error == NFSERR_NOTSUPP) { 1606 fmode &= ~O_EXCL; 1607 goto again; 1608 } 1609 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) { 1610 if (nfscl_checksattr(vap, &nfsva)) { 1611 /* 1612 * We are normally called with only a partially 1613 * initialized VAP. Since the NFSv3 spec says that 1614 * the server may use the file attributes to 1615 * store the verifier, the spec requires us to do a 1616 * SETATTR RPC. FreeBSD servers store the verifier in 1617 * atime, but we can't really assume that all servers 1618 * will so we ensure that our SETATTR sets both atime 1619 * and mtime. 1620 */ 1621 if (vap->va_mtime.tv_sec == VNOVAL) 1622 vfs_timestamp(&vap->va_mtime); 1623 if (vap->va_atime.tv_sec == VNOVAL) 1624 vap->va_atime = vap->va_mtime; 1625 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred, 1626 cnp->cn_thread, &nfsva, &attrflag, NULL); 1627 if (error && (vap->va_uid != (uid_t)VNOVAL || 1628 vap->va_gid != (gid_t)VNOVAL)) { 1629 /* try again without setting uid/gid */ 1630 vap->va_uid = (uid_t)VNOVAL; 1631 vap->va_gid = (uid_t)VNOVAL; 1632 error = nfsrpc_setattr(newvp, vap, NULL, 1633 cnp->cn_cred, cnp->cn_thread, &nfsva, 1634 &attrflag, NULL); 1635 } 1636 if (attrflag) 1637 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 1638 NULL, 0, 1); 1639 if (error != 0) 1640 vput(newvp); 1641 } 1642 } 1643 if (!error) { 1644 if ((cnp->cn_flags & MAKEENTRY) && attrflag) 1645 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 1646 NULL); 1647 *ap->a_vpp = newvp; 1648 } else if (NFS_ISV4(dvp)) { 1649 error = nfscl_maperr(cnp->cn_thread, error, vap->va_uid, 1650 vap->va_gid); 1651 } 1652 mtx_lock(&dnp->n_mtx); 1653 dnp->n_flag |= NMODIFIED; 1654 if (!dattrflag) { 1655 dnp->n_attrstamp = 0; 1656 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1657 } 1658 mtx_unlock(&dnp->n_mtx); 1659 return (error); 1660 } 1661 1662 /* 1663 * nfs file remove call 1664 * To try and make nfs semantics closer to ufs semantics, a file that has 1665 * other processes using the vnode is renamed instead of removed and then 1666 * removed later on the last close. 1667 * - If v_usecount > 1 1668 * If a rename is not already in the works 1669 * call nfs_sillyrename() to set it up 1670 * else 1671 * do the remove rpc 1672 */ 1673 static int 1674 nfs_remove(struct vop_remove_args *ap) 1675 { 1676 struct vnode *vp = ap->a_vp; 1677 struct vnode *dvp = ap->a_dvp; 1678 struct componentname *cnp = ap->a_cnp; 1679 struct nfsnode *np = VTONFS(vp); 1680 int error = 0; 1681 struct vattr vattr; 1682 1683 KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name")); 1684 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount")); 1685 if (vp->v_type == VDIR) 1686 error = EPERM; 1687 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1688 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1689 vattr.va_nlink > 1)) { 1690 /* 1691 * Purge the name cache so that the chance of a lookup for 1692 * the name succeeding while the remove is in progress is 1693 * minimized. Without node locking it can still happen, such 1694 * that an I/O op returns ESTALE, but since you get this if 1695 * another host removes the file.. 1696 */ 1697 cache_purge(vp); 1698 /* 1699 * throw away biocache buffers, mainly to avoid 1700 * unnecessary delayed writes later. 1701 */ 1702 error = ncl_vinvalbuf(vp, 0, cnp->cn_thread, 1); 1703 /* Do the rpc */ 1704 if (error != EINTR && error != EIO) 1705 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr, 1706 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1707 /* 1708 * Kludge City: If the first reply to the remove rpc is lost.. 1709 * the reply to the retransmitted request will be ENOENT 1710 * since the file was in fact removed 1711 * Therefore, we cheat and return success. 1712 */ 1713 if (error == ENOENT) 1714 error = 0; 1715 } else if (!np->n_sillyrename) 1716 error = nfs_sillyrename(dvp, vp, cnp); 1717 mtx_lock(&np->n_mtx); 1718 np->n_attrstamp = 0; 1719 mtx_unlock(&np->n_mtx); 1720 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1721 return (error); 1722 } 1723 1724 /* 1725 * nfs file remove rpc called from nfs_inactive 1726 */ 1727 int 1728 ncl_removeit(struct sillyrename *sp, struct vnode *vp) 1729 { 1730 /* 1731 * Make sure that the directory vnode is still valid. 1732 * XXX we should lock sp->s_dvp here. 1733 */ 1734 if (sp->s_dvp->v_type == VBAD) 1735 return (0); 1736 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen, 1737 sp->s_cred, NULL)); 1738 } 1739 1740 /* 1741 * Nfs remove rpc, called from nfs_remove() and ncl_removeit(). 1742 */ 1743 static int 1744 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name, 1745 int namelen, struct ucred *cred, struct thread *td) 1746 { 1747 struct nfsvattr dnfsva; 1748 struct nfsnode *dnp = VTONFS(dvp); 1749 int error = 0, dattrflag; 1750 1751 mtx_lock(&dnp->n_mtx); 1752 dnp->n_flag |= NREMOVEINPROG; 1753 mtx_unlock(&dnp->n_mtx); 1754 error = nfsrpc_remove(dvp, name, namelen, vp, cred, td, &dnfsva, 1755 &dattrflag, NULL); 1756 mtx_lock(&dnp->n_mtx); 1757 if ((dnp->n_flag & NREMOVEWANT)) { 1758 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG); 1759 mtx_unlock(&dnp->n_mtx); 1760 wakeup((caddr_t)dnp); 1761 } else { 1762 dnp->n_flag &= ~NREMOVEINPROG; 1763 mtx_unlock(&dnp->n_mtx); 1764 } 1765 if (dattrflag) 1766 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 1767 mtx_lock(&dnp->n_mtx); 1768 dnp->n_flag |= NMODIFIED; 1769 if (!dattrflag) { 1770 dnp->n_attrstamp = 0; 1771 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1772 } 1773 mtx_unlock(&dnp->n_mtx); 1774 if (error && NFS_ISV4(dvp)) 1775 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1776 return (error); 1777 } 1778 1779 /* 1780 * nfs file rename call 1781 */ 1782 static int 1783 nfs_rename(struct vop_rename_args *ap) 1784 { 1785 struct vnode *fvp = ap->a_fvp; 1786 struct vnode *tvp = ap->a_tvp; 1787 struct vnode *fdvp = ap->a_fdvp; 1788 struct vnode *tdvp = ap->a_tdvp; 1789 struct componentname *tcnp = ap->a_tcnp; 1790 struct componentname *fcnp = ap->a_fcnp; 1791 struct nfsnode *fnp = VTONFS(ap->a_fvp); 1792 struct nfsnode *tdnp = VTONFS(ap->a_tdvp); 1793 struct nfsv4node *newv4 = NULL; 1794 int error; 1795 1796 KASSERT((tcnp->cn_flags & HASBUF) != 0 && 1797 (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name")); 1798 /* Check for cross-device rename */ 1799 if ((fvp->v_mount != tdvp->v_mount) || 1800 (tvp && (fvp->v_mount != tvp->v_mount))) { 1801 error = EXDEV; 1802 goto out; 1803 } 1804 1805 if (fvp == tvp) { 1806 ncl_printf("nfs_rename: fvp == tvp (can't happen)\n"); 1807 error = 0; 1808 goto out; 1809 } 1810 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0) 1811 goto out; 1812 1813 /* 1814 * We have to flush B_DELWRI data prior to renaming 1815 * the file. If we don't, the delayed-write buffers 1816 * can be flushed out later after the file has gone stale 1817 * under NFSV3. NFSV2 does not have this problem because 1818 * ( as far as I can tell ) it flushes dirty buffers more 1819 * often. 1820 * 1821 * Skip the rename operation if the fsync fails, this can happen 1822 * due to the server's volume being full, when we pushed out data 1823 * that was written back to our cache earlier. Not checking for 1824 * this condition can result in potential (silent) data loss. 1825 */ 1826 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread); 1827 NFSVOPUNLOCK(fvp, 0); 1828 if (!error && tvp) 1829 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread); 1830 if (error) 1831 goto out; 1832 1833 /* 1834 * If the tvp exists and is in use, sillyrename it before doing the 1835 * rename of the new file over it. 1836 * XXX Can't sillyrename a directory. 1837 */ 1838 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1839 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1840 vput(tvp); 1841 tvp = NULL; 1842 } 1843 1844 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1845 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1846 tcnp->cn_thread); 1847 1848 if (error == 0 && NFS_ISV4(tdvp)) { 1849 /* 1850 * For NFSv4, check to see if it is the same name and 1851 * replace the name, if it is different. 1852 */ 1853 MALLOC(newv4, struct nfsv4node *, 1854 sizeof (struct nfsv4node) + 1855 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1, 1856 M_NFSV4NODE, M_WAITOK); 1857 mtx_lock(&tdnp->n_mtx); 1858 mtx_lock(&fnp->n_mtx); 1859 if (fnp->n_v4 != NULL && fvp->v_type == VREG && 1860 (fnp->n_v4->n4_namelen != tcnp->cn_namelen || 1861 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4), 1862 tcnp->cn_namelen) || 1863 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen || 1864 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 1865 tdnp->n_fhp->nfh_len))) { 1866 #ifdef notdef 1867 { char nnn[100]; int nnnl; 1868 nnnl = (tcnp->cn_namelen < 100) ? tcnp->cn_namelen : 99; 1869 bcopy(tcnp->cn_nameptr, nnn, nnnl); 1870 nnn[nnnl] = '\0'; 1871 printf("ren replace=%s\n",nnn); 1872 } 1873 #endif 1874 FREE((caddr_t)fnp->n_v4, M_NFSV4NODE); 1875 fnp->n_v4 = newv4; 1876 newv4 = NULL; 1877 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len; 1878 fnp->n_v4->n4_namelen = tcnp->cn_namelen; 1879 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data, 1880 tdnp->n_fhp->nfh_len); 1881 NFSBCOPY(tcnp->cn_nameptr, 1882 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen); 1883 } 1884 mtx_unlock(&tdnp->n_mtx); 1885 mtx_unlock(&fnp->n_mtx); 1886 if (newv4 != NULL) 1887 FREE((caddr_t)newv4, M_NFSV4NODE); 1888 } 1889 1890 if (fvp->v_type == VDIR) { 1891 if (tvp != NULL && tvp->v_type == VDIR) 1892 cache_purge(tdvp); 1893 cache_purge(fdvp); 1894 } 1895 1896 out: 1897 if (tdvp == tvp) 1898 vrele(tdvp); 1899 else 1900 vput(tdvp); 1901 if (tvp) 1902 vput(tvp); 1903 vrele(fdvp); 1904 vrele(fvp); 1905 /* 1906 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1907 */ 1908 if (error == ENOENT) 1909 error = 0; 1910 return (error); 1911 } 1912 1913 /* 1914 * nfs file rename rpc called from nfs_remove() above 1915 */ 1916 static int 1917 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp, 1918 struct sillyrename *sp) 1919 { 1920 1921 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen, 1922 sdvp, NULL, sp->s_name, sp->s_namlen, scnp->cn_cred, 1923 scnp->cn_thread)); 1924 } 1925 1926 /* 1927 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1928 */ 1929 static int 1930 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr, 1931 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr, 1932 int tnamelen, struct ucred *cred, struct thread *td) 1933 { 1934 struct nfsvattr fnfsva, tnfsva; 1935 struct nfsnode *fdnp = VTONFS(fdvp); 1936 struct nfsnode *tdnp = VTONFS(tdvp); 1937 int error = 0, fattrflag, tattrflag; 1938 1939 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp, 1940 tnameptr, tnamelen, cred, td, &fnfsva, &tnfsva, &fattrflag, 1941 &tattrflag, NULL, NULL); 1942 mtx_lock(&fdnp->n_mtx); 1943 fdnp->n_flag |= NMODIFIED; 1944 if (fattrflag != 0) { 1945 mtx_unlock(&fdnp->n_mtx); 1946 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, NULL, 0, 1); 1947 } else { 1948 fdnp->n_attrstamp = 0; 1949 mtx_unlock(&fdnp->n_mtx); 1950 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 1951 } 1952 mtx_lock(&tdnp->n_mtx); 1953 tdnp->n_flag |= NMODIFIED; 1954 if (tattrflag != 0) { 1955 mtx_unlock(&tdnp->n_mtx); 1956 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, NULL, 0, 1); 1957 } else { 1958 tdnp->n_attrstamp = 0; 1959 mtx_unlock(&tdnp->n_mtx); 1960 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 1961 } 1962 if (error && NFS_ISV4(fdvp)) 1963 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 1964 return (error); 1965 } 1966 1967 /* 1968 * nfs hard link create call 1969 */ 1970 static int 1971 nfs_link(struct vop_link_args *ap) 1972 { 1973 struct vnode *vp = ap->a_vp; 1974 struct vnode *tdvp = ap->a_tdvp; 1975 struct componentname *cnp = ap->a_cnp; 1976 struct nfsnode *np, *tdnp; 1977 struct nfsvattr nfsva, dnfsva; 1978 int error = 0, attrflag, dattrflag; 1979 1980 /* 1981 * Push all writes to the server, so that the attribute cache 1982 * doesn't get "out of sync" with the server. 1983 * XXX There should be a better way! 1984 */ 1985 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread); 1986 1987 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 1988 cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &attrflag, 1989 &dattrflag, NULL); 1990 tdnp = VTONFS(tdvp); 1991 mtx_lock(&tdnp->n_mtx); 1992 tdnp->n_flag |= NMODIFIED; 1993 if (dattrflag != 0) { 1994 mtx_unlock(&tdnp->n_mtx); 1995 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, NULL, 0, 1); 1996 } else { 1997 tdnp->n_attrstamp = 0; 1998 mtx_unlock(&tdnp->n_mtx); 1999 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2000 } 2001 if (attrflag) 2002 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2003 else { 2004 np = VTONFS(vp); 2005 mtx_lock(&np->n_mtx); 2006 np->n_attrstamp = 0; 2007 mtx_unlock(&np->n_mtx); 2008 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 2009 } 2010 /* 2011 * If negative lookup caching is enabled, I might as well 2012 * add an entry for this node. Not necessary for correctness, 2013 * but if negative caching is enabled, then the system 2014 * must care about lookup caching hit rate, so... 2015 */ 2016 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 && 2017 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2018 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL); 2019 } 2020 if (error && NFS_ISV4(vp)) 2021 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0, 2022 (gid_t)0); 2023 return (error); 2024 } 2025 2026 /* 2027 * nfs symbolic link create call 2028 */ 2029 static int 2030 nfs_symlink(struct vop_symlink_args *ap) 2031 { 2032 struct vnode *dvp = ap->a_dvp; 2033 struct vattr *vap = ap->a_vap; 2034 struct componentname *cnp = ap->a_cnp; 2035 struct nfsvattr nfsva, dnfsva; 2036 struct nfsfh *nfhp; 2037 struct nfsnode *np = NULL, *dnp; 2038 struct vnode *newvp = NULL; 2039 int error = 0, attrflag, dattrflag, ret; 2040 2041 vap->va_type = VLNK; 2042 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2043 ap->a_target, vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, 2044 &nfsva, &nfhp, &attrflag, &dattrflag, NULL); 2045 if (nfhp) { 2046 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread, 2047 &np, NULL, LK_EXCLUSIVE); 2048 if (!ret) 2049 newvp = NFSTOV(np); 2050 else if (!error) 2051 error = ret; 2052 } 2053 if (newvp != NULL) { 2054 if (attrflag) 2055 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2056 0, 1); 2057 } else if (!error) { 2058 /* 2059 * If we do not have an error and we could not extract the 2060 * newvp from the response due to the request being NFSv2, we 2061 * have to do a lookup in order to obtain a newvp to return. 2062 */ 2063 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2064 cnp->cn_cred, cnp->cn_thread, &np); 2065 if (!error) 2066 newvp = NFSTOV(np); 2067 } 2068 if (error) { 2069 if (newvp) 2070 vput(newvp); 2071 if (NFS_ISV4(dvp)) 2072 error = nfscl_maperr(cnp->cn_thread, error, 2073 vap->va_uid, vap->va_gid); 2074 } else { 2075 *ap->a_vpp = newvp; 2076 } 2077 2078 dnp = VTONFS(dvp); 2079 mtx_lock(&dnp->n_mtx); 2080 dnp->n_flag |= NMODIFIED; 2081 if (dattrflag != 0) { 2082 mtx_unlock(&dnp->n_mtx); 2083 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2084 } else { 2085 dnp->n_attrstamp = 0; 2086 mtx_unlock(&dnp->n_mtx); 2087 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2088 } 2089 /* 2090 * If negative lookup caching is enabled, I might as well 2091 * add an entry for this node. Not necessary for correctness, 2092 * but if negative caching is enabled, then the system 2093 * must care about lookup caching hit rate, so... 2094 */ 2095 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2096 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) { 2097 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, NULL); 2098 } 2099 return (error); 2100 } 2101 2102 /* 2103 * nfs make dir call 2104 */ 2105 static int 2106 nfs_mkdir(struct vop_mkdir_args *ap) 2107 { 2108 struct vnode *dvp = ap->a_dvp; 2109 struct vattr *vap = ap->a_vap; 2110 struct componentname *cnp = ap->a_cnp; 2111 struct nfsnode *np = NULL, *dnp; 2112 struct vnode *newvp = NULL; 2113 struct vattr vattr; 2114 struct nfsfh *nfhp; 2115 struct nfsvattr nfsva, dnfsva; 2116 int error = 0, attrflag, dattrflag, ret; 2117 2118 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2119 return (error); 2120 vap->va_type = VDIR; 2121 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2122 vap, cnp->cn_cred, cnp->cn_thread, &dnfsva, &nfsva, &nfhp, 2123 &attrflag, &dattrflag, NULL); 2124 dnp = VTONFS(dvp); 2125 mtx_lock(&dnp->n_mtx); 2126 dnp->n_flag |= NMODIFIED; 2127 if (dattrflag != 0) { 2128 mtx_unlock(&dnp->n_mtx); 2129 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2130 } else { 2131 dnp->n_attrstamp = 0; 2132 mtx_unlock(&dnp->n_mtx); 2133 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2134 } 2135 if (nfhp) { 2136 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, cnp->cn_thread, 2137 &np, NULL, LK_EXCLUSIVE); 2138 if (!ret) { 2139 newvp = NFSTOV(np); 2140 if (attrflag) 2141 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 2142 NULL, 0, 1); 2143 } else if (!error) 2144 error = ret; 2145 } 2146 if (!error && newvp == NULL) { 2147 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2148 cnp->cn_cred, cnp->cn_thread, &np); 2149 if (!error) { 2150 newvp = NFSTOV(np); 2151 if (newvp->v_type != VDIR) 2152 error = EEXIST; 2153 } 2154 } 2155 if (error) { 2156 if (newvp) 2157 vput(newvp); 2158 if (NFS_ISV4(dvp)) 2159 error = nfscl_maperr(cnp->cn_thread, error, 2160 vap->va_uid, vap->va_gid); 2161 } else { 2162 /* 2163 * If negative lookup caching is enabled, I might as well 2164 * add an entry for this node. Not necessary for correctness, 2165 * but if negative caching is enabled, then the system 2166 * must care about lookup caching hit rate, so... 2167 */ 2168 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 && 2169 (cnp->cn_flags & MAKEENTRY) && 2170 attrflag != 0 && dattrflag != 0) 2171 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime, 2172 &dnfsva.na_ctime); 2173 *ap->a_vpp = newvp; 2174 } 2175 return (error); 2176 } 2177 2178 /* 2179 * nfs remove directory call 2180 */ 2181 static int 2182 nfs_rmdir(struct vop_rmdir_args *ap) 2183 { 2184 struct vnode *vp = ap->a_vp; 2185 struct vnode *dvp = ap->a_dvp; 2186 struct componentname *cnp = ap->a_cnp; 2187 struct nfsnode *dnp; 2188 struct nfsvattr dnfsva; 2189 int error, dattrflag; 2190 2191 if (dvp == vp) 2192 return (EINVAL); 2193 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2194 cnp->cn_cred, cnp->cn_thread, &dnfsva, &dattrflag, NULL); 2195 dnp = VTONFS(dvp); 2196 mtx_lock(&dnp->n_mtx); 2197 dnp->n_flag |= NMODIFIED; 2198 if (dattrflag != 0) { 2199 mtx_unlock(&dnp->n_mtx); 2200 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2201 } else { 2202 dnp->n_attrstamp = 0; 2203 mtx_unlock(&dnp->n_mtx); 2204 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2205 } 2206 2207 cache_purge(dvp); 2208 cache_purge(vp); 2209 if (error && NFS_ISV4(dvp)) 2210 error = nfscl_maperr(cnp->cn_thread, error, (uid_t)0, 2211 (gid_t)0); 2212 /* 2213 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2214 */ 2215 if (error == ENOENT) 2216 error = 0; 2217 return (error); 2218 } 2219 2220 /* 2221 * nfs readdir call 2222 */ 2223 static int 2224 nfs_readdir(struct vop_readdir_args *ap) 2225 { 2226 struct vnode *vp = ap->a_vp; 2227 struct nfsnode *np = VTONFS(vp); 2228 struct uio *uio = ap->a_uio; 2229 ssize_t tresid; 2230 int error = 0; 2231 struct vattr vattr; 2232 2233 if (ap->a_eofflag != NULL) 2234 *ap->a_eofflag = 0; 2235 if (vp->v_type != VDIR) 2236 return(EPERM); 2237 2238 /* 2239 * First, check for hit on the EOF offset cache 2240 */ 2241 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2242 (np->n_flag & NMODIFIED) == 0) { 2243 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2244 mtx_lock(&np->n_mtx); 2245 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) || 2246 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2247 mtx_unlock(&np->n_mtx); 2248 NFSINCRGLOBAL(newnfsstats.direofcache_hits); 2249 if (ap->a_eofflag != NULL) 2250 *ap->a_eofflag = 1; 2251 return (0); 2252 } else 2253 mtx_unlock(&np->n_mtx); 2254 } 2255 } 2256 2257 /* 2258 * Call ncl_bioread() to do the real work. 2259 */ 2260 tresid = uio->uio_resid; 2261 error = ncl_bioread(vp, uio, 0, ap->a_cred); 2262 2263 if (!error && uio->uio_resid == tresid) { 2264 NFSINCRGLOBAL(newnfsstats.direofcache_misses); 2265 if (ap->a_eofflag != NULL) 2266 *ap->a_eofflag = 1; 2267 } 2268 return (error); 2269 } 2270 2271 /* 2272 * Readdir rpc call. 2273 * Called from below the buffer cache by ncl_doio(). 2274 */ 2275 int 2276 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2277 struct thread *td) 2278 { 2279 struct nfsvattr nfsva; 2280 nfsuint64 *cookiep, cookie; 2281 struct nfsnode *dnp = VTONFS(vp); 2282 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2283 int error = 0, eof, attrflag; 2284 2285 KASSERT(uiop->uio_iovcnt == 1 && 2286 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2287 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2288 ("nfs readdirrpc bad uio")); 2289 2290 /* 2291 * If there is no cookie, assume directory was stale. 2292 */ 2293 ncl_dircookie_lock(dnp); 2294 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2295 if (cookiep) { 2296 cookie = *cookiep; 2297 ncl_dircookie_unlock(dnp); 2298 } else { 2299 ncl_dircookie_unlock(dnp); 2300 return (NFSERR_BAD_COOKIE); 2301 } 2302 2303 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2304 (void)ncl_fsinfo(nmp, vp, cred, td); 2305 2306 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva, 2307 &attrflag, &eof, NULL); 2308 if (attrflag) 2309 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2310 2311 if (!error) { 2312 /* 2313 * We are now either at the end of the directory or have filled 2314 * the block. 2315 */ 2316 if (eof) 2317 dnp->n_direofoffset = uiop->uio_offset; 2318 else { 2319 if (uiop->uio_resid > 0) 2320 ncl_printf("EEK! readdirrpc resid > 0\n"); 2321 ncl_dircookie_lock(dnp); 2322 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2323 *cookiep = cookie; 2324 ncl_dircookie_unlock(dnp); 2325 } 2326 } else if (NFS_ISV4(vp)) { 2327 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2328 } 2329 return (error); 2330 } 2331 2332 /* 2333 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc(). 2334 */ 2335 int 2336 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 2337 struct thread *td) 2338 { 2339 struct nfsvattr nfsva; 2340 nfsuint64 *cookiep, cookie; 2341 struct nfsnode *dnp = VTONFS(vp); 2342 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2343 int error = 0, attrflag, eof; 2344 2345 KASSERT(uiop->uio_iovcnt == 1 && 2346 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && 2347 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, 2348 ("nfs readdirplusrpc bad uio")); 2349 2350 /* 2351 * If there is no cookie, assume directory was stale. 2352 */ 2353 ncl_dircookie_lock(dnp); 2354 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0); 2355 if (cookiep) { 2356 cookie = *cookiep; 2357 ncl_dircookie_unlock(dnp); 2358 } else { 2359 ncl_dircookie_unlock(dnp); 2360 return (NFSERR_BAD_COOKIE); 2361 } 2362 2363 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp)) 2364 (void)ncl_fsinfo(nmp, vp, cred, td); 2365 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva, 2366 &attrflag, &eof, NULL); 2367 if (attrflag) 2368 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 1); 2369 2370 if (!error) { 2371 /* 2372 * We are now either at end of the directory or have filled the 2373 * the block. 2374 */ 2375 if (eof) 2376 dnp->n_direofoffset = uiop->uio_offset; 2377 else { 2378 if (uiop->uio_resid > 0) 2379 ncl_printf("EEK! readdirplusrpc resid > 0\n"); 2380 ncl_dircookie_lock(dnp); 2381 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1); 2382 *cookiep = cookie; 2383 ncl_dircookie_unlock(dnp); 2384 } 2385 } else if (NFS_ISV4(vp)) { 2386 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2387 } 2388 return (error); 2389 } 2390 2391 /* 2392 * Silly rename. To make the NFS filesystem that is stateless look a little 2393 * more like the "ufs" a remove of an active vnode is translated to a rename 2394 * to a funny looking filename that is removed by nfs_inactive on the 2395 * nfsnode. There is the potential for another process on a different client 2396 * to create the same funny name between the nfs_lookitup() fails and the 2397 * nfs_rename() completes, but... 2398 */ 2399 static int 2400 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2401 { 2402 struct sillyrename *sp; 2403 struct nfsnode *np; 2404 int error; 2405 short pid; 2406 unsigned int lticks; 2407 2408 cache_purge(dvp); 2409 np = VTONFS(vp); 2410 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir")); 2411 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2412 M_NEWNFSREQ, M_WAITOK); 2413 sp->s_cred = crhold(cnp->cn_cred); 2414 sp->s_dvp = dvp; 2415 VREF(dvp); 2416 2417 /* 2418 * Fudge together a funny name. 2419 * Changing the format of the funny name to accomodate more 2420 * sillynames per directory. 2421 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2422 * CPU ticks since boot. 2423 */ 2424 pid = cnp->cn_thread->td_proc->p_pid; 2425 lticks = (unsigned int)ticks; 2426 for ( ; ; ) { 2427 sp->s_namlen = sprintf(sp->s_name, 2428 ".nfs.%08x.%04x4.4", lticks, 2429 pid); 2430 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2431 cnp->cn_thread, NULL)) 2432 break; 2433 lticks++; 2434 } 2435 error = nfs_renameit(dvp, vp, cnp, sp); 2436 if (error) 2437 goto bad; 2438 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2439 cnp->cn_thread, &np); 2440 np->n_sillyrename = sp; 2441 return (0); 2442 bad: 2443 vrele(sp->s_dvp); 2444 crfree(sp->s_cred); 2445 free((caddr_t)sp, M_NEWNFSREQ); 2446 return (error); 2447 } 2448 2449 /* 2450 * Look up a file name and optionally either update the file handle or 2451 * allocate an nfsnode, depending on the value of npp. 2452 * npp == NULL --> just do the lookup 2453 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2454 * handled too 2455 * *npp != NULL --> update the file handle in the vnode 2456 */ 2457 static int 2458 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred, 2459 struct thread *td, struct nfsnode **npp) 2460 { 2461 struct vnode *newvp = NULL, *vp; 2462 struct nfsnode *np, *dnp = VTONFS(dvp); 2463 struct nfsfh *nfhp, *onfhp; 2464 struct nfsvattr nfsva, dnfsva; 2465 struct componentname cn; 2466 int error = 0, attrflag, dattrflag; 2467 u_int hash; 2468 2469 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva, 2470 &nfhp, &attrflag, &dattrflag, NULL); 2471 if (dattrflag) 2472 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, NULL, 0, 1); 2473 if (npp && !error) { 2474 if (*npp != NULL) { 2475 np = *npp; 2476 vp = NFSTOV(np); 2477 /* 2478 * For NFSv4, check to see if it is the same name and 2479 * replace the name, if it is different. 2480 */ 2481 if (np->n_v4 != NULL && nfsva.na_type == VREG && 2482 (np->n_v4->n4_namelen != len || 2483 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) || 2484 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen || 2485 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2486 dnp->n_fhp->nfh_len))) { 2487 #ifdef notdef 2488 { char nnn[100]; int nnnl; 2489 nnnl = (len < 100) ? len : 99; 2490 bcopy(name, nnn, nnnl); 2491 nnn[nnnl] = '\0'; 2492 printf("replace=%s\n",nnn); 2493 } 2494 #endif 2495 FREE((caddr_t)np->n_v4, M_NFSV4NODE); 2496 MALLOC(np->n_v4, struct nfsv4node *, 2497 sizeof (struct nfsv4node) + 2498 dnp->n_fhp->nfh_len + len - 1, 2499 M_NFSV4NODE, M_WAITOK); 2500 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len; 2501 np->n_v4->n4_namelen = len; 2502 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data, 2503 dnp->n_fhp->nfh_len); 2504 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len); 2505 } 2506 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, 2507 FNV1_32_INIT); 2508 onfhp = np->n_fhp; 2509 /* 2510 * Rehash node for new file handle. 2511 */ 2512 vfs_hash_rehash(vp, hash); 2513 np->n_fhp = nfhp; 2514 if (onfhp != NULL) 2515 FREE((caddr_t)onfhp, M_NFSFH); 2516 newvp = NFSTOV(np); 2517 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) { 2518 FREE((caddr_t)nfhp, M_NFSFH); 2519 VREF(dvp); 2520 newvp = dvp; 2521 } else { 2522 cn.cn_nameptr = name; 2523 cn.cn_namelen = len; 2524 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td, 2525 &np, NULL, LK_EXCLUSIVE); 2526 if (error) 2527 return (error); 2528 newvp = NFSTOV(np); 2529 } 2530 if (!attrflag && *npp == NULL) { 2531 if (newvp == dvp) 2532 vrele(newvp); 2533 else 2534 vput(newvp); 2535 return (ENOENT); 2536 } 2537 if (attrflag) 2538 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, NULL, 2539 0, 1); 2540 } 2541 if (npp && *npp == NULL) { 2542 if (error) { 2543 if (newvp) { 2544 if (newvp == dvp) 2545 vrele(newvp); 2546 else 2547 vput(newvp); 2548 } 2549 } else 2550 *npp = np; 2551 } 2552 if (error && NFS_ISV4(dvp)) 2553 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2554 return (error); 2555 } 2556 2557 /* 2558 * Nfs Version 3 and 4 commit rpc 2559 */ 2560 int 2561 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2562 struct thread *td) 2563 { 2564 struct nfsvattr nfsva; 2565 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2566 int error, attrflag; 2567 2568 mtx_lock(&nmp->nm_mtx); 2569 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2570 mtx_unlock(&nmp->nm_mtx); 2571 return (0); 2572 } 2573 mtx_unlock(&nmp->nm_mtx); 2574 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva, 2575 &attrflag, NULL); 2576 if (attrflag != 0) 2577 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 2578 0, 1); 2579 if (error != 0 && NFS_ISV4(vp)) 2580 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0); 2581 return (error); 2582 } 2583 2584 /* 2585 * Strategy routine. 2586 * For async requests when nfsiod(s) are running, queue the request by 2587 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the 2588 * request. 2589 */ 2590 static int 2591 nfs_strategy(struct vop_strategy_args *ap) 2592 { 2593 struct buf *bp = ap->a_bp; 2594 struct ucred *cr; 2595 2596 KASSERT(!(bp->b_flags & B_DONE), 2597 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2598 BUF_ASSERT_HELD(bp); 2599 2600 if (bp->b_iocmd == BIO_READ) 2601 cr = bp->b_rcred; 2602 else 2603 cr = bp->b_wcred; 2604 2605 /* 2606 * If the op is asynchronous and an i/o daemon is waiting 2607 * queue the request, wake it up and wait for completion 2608 * otherwise just do it ourselves. 2609 */ 2610 if ((bp->b_flags & B_ASYNC) == 0 || 2611 ncl_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread)) 2612 (void) ncl_doio(ap->a_vp, bp, cr, curthread, 1); 2613 return (0); 2614 } 2615 2616 /* 2617 * fsync vnode op. Just call ncl_flush() with commit == 1. 2618 */ 2619 /* ARGSUSED */ 2620 static int 2621 nfs_fsync(struct vop_fsync_args *ap) 2622 { 2623 2624 if (ap->a_vp->v_type != VREG) { 2625 /* 2626 * For NFS, metadata is changed synchronously on the server, 2627 * so there is nothing to flush. Also, ncl_flush() clears 2628 * the NMODIFIED flag and that shouldn't be done here for 2629 * directories. 2630 */ 2631 return (0); 2632 } 2633 return (ncl_flush(ap->a_vp, ap->a_waitfor, NULL, ap->a_td, 1, 0)); 2634 } 2635 2636 /* 2637 * Flush all the blocks associated with a vnode. 2638 * Walk through the buffer pool and push any dirty pages 2639 * associated with the vnode. 2640 * If the called_from_renewthread argument is TRUE, it has been called 2641 * from the NFSv4 renew thread and, as such, cannot block indefinitely 2642 * waiting for a buffer write to complete. 2643 */ 2644 int 2645 ncl_flush(struct vnode *vp, int waitfor, struct ucred *cred, struct thread *td, 2646 int commit, int called_from_renewthread) 2647 { 2648 struct nfsnode *np = VTONFS(vp); 2649 struct buf *bp; 2650 int i; 2651 struct buf *nbp; 2652 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2653 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2654 int passone = 1, trycnt = 0; 2655 u_quad_t off, endoff, toff; 2656 struct ucred* wcred = NULL; 2657 struct buf **bvec = NULL; 2658 struct bufobj *bo; 2659 #ifndef NFS_COMMITBVECSIZ 2660 #define NFS_COMMITBVECSIZ 20 2661 #endif 2662 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2663 int bvecsize = 0, bveccount; 2664 2665 if (called_from_renewthread != 0) 2666 slptimeo = hz; 2667 if (nmp->nm_flag & NFSMNT_INT) 2668 slpflag = PCATCH; 2669 if (!commit) 2670 passone = 0; 2671 bo = &vp->v_bufobj; 2672 /* 2673 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2674 * server, but has not been committed to stable storage on the server 2675 * yet. On the first pass, the byte range is worked out and the commit 2676 * rpc is done. On the second pass, ncl_writebp() is called to do the 2677 * job. 2678 */ 2679 again: 2680 off = (u_quad_t)-1; 2681 endoff = 0; 2682 bvecpos = 0; 2683 if (NFS_ISV34(vp) && commit) { 2684 if (bvec != NULL && bvec != bvec_on_stack) 2685 free(bvec, M_TEMP); 2686 /* 2687 * Count up how many buffers waiting for a commit. 2688 */ 2689 bveccount = 0; 2690 BO_LOCK(bo); 2691 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2692 if (!BUF_ISLOCKED(bp) && 2693 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2694 == (B_DELWRI | B_NEEDCOMMIT)) 2695 bveccount++; 2696 } 2697 /* 2698 * Allocate space to remember the list of bufs to commit. It is 2699 * important to use M_NOWAIT here to avoid a race with nfs_write. 2700 * If we can't get memory (for whatever reason), we will end up 2701 * committing the buffers one-by-one in the loop below. 2702 */ 2703 if (bveccount > NFS_COMMITBVECSIZ) { 2704 /* 2705 * Release the vnode interlock to avoid a lock 2706 * order reversal. 2707 */ 2708 BO_UNLOCK(bo); 2709 bvec = (struct buf **) 2710 malloc(bveccount * sizeof(struct buf *), 2711 M_TEMP, M_NOWAIT); 2712 BO_LOCK(bo); 2713 if (bvec == NULL) { 2714 bvec = bvec_on_stack; 2715 bvecsize = NFS_COMMITBVECSIZ; 2716 } else 2717 bvecsize = bveccount; 2718 } else { 2719 bvec = bvec_on_stack; 2720 bvecsize = NFS_COMMITBVECSIZ; 2721 } 2722 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2723 if (bvecpos >= bvecsize) 2724 break; 2725 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2726 nbp = TAILQ_NEXT(bp, b_bobufs); 2727 continue; 2728 } 2729 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2730 (B_DELWRI | B_NEEDCOMMIT)) { 2731 BUF_UNLOCK(bp); 2732 nbp = TAILQ_NEXT(bp, b_bobufs); 2733 continue; 2734 } 2735 BO_UNLOCK(bo); 2736 bremfree(bp); 2737 /* 2738 * Work out if all buffers are using the same cred 2739 * so we can deal with them all with one commit. 2740 * 2741 * NOTE: we are not clearing B_DONE here, so we have 2742 * to do it later on in this routine if we intend to 2743 * initiate I/O on the bp. 2744 * 2745 * Note: to avoid loopback deadlocks, we do not 2746 * assign b_runningbufspace. 2747 */ 2748 if (wcred == NULL) 2749 wcred = bp->b_wcred; 2750 else if (wcred != bp->b_wcred) 2751 wcred = NOCRED; 2752 vfs_busy_pages(bp, 1); 2753 2754 BO_LOCK(bo); 2755 /* 2756 * bp is protected by being locked, but nbp is not 2757 * and vfs_busy_pages() may sleep. We have to 2758 * recalculate nbp. 2759 */ 2760 nbp = TAILQ_NEXT(bp, b_bobufs); 2761 2762 /* 2763 * A list of these buffers is kept so that the 2764 * second loop knows which buffers have actually 2765 * been committed. This is necessary, since there 2766 * may be a race between the commit rpc and new 2767 * uncommitted writes on the file. 2768 */ 2769 bvec[bvecpos++] = bp; 2770 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2771 bp->b_dirtyoff; 2772 if (toff < off) 2773 off = toff; 2774 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 2775 if (toff > endoff) 2776 endoff = toff; 2777 } 2778 BO_UNLOCK(bo); 2779 } 2780 if (bvecpos > 0) { 2781 /* 2782 * Commit data on the server, as required. 2783 * If all bufs are using the same wcred, then use that with 2784 * one call for all of them, otherwise commit each one 2785 * separately. 2786 */ 2787 if (wcred != NOCRED) 2788 retv = ncl_commit(vp, off, (int)(endoff - off), 2789 wcred, td); 2790 else { 2791 retv = 0; 2792 for (i = 0; i < bvecpos; i++) { 2793 off_t off, size; 2794 bp = bvec[i]; 2795 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2796 bp->b_dirtyoff; 2797 size = (u_quad_t)(bp->b_dirtyend 2798 - bp->b_dirtyoff); 2799 retv = ncl_commit(vp, off, (int)size, 2800 bp->b_wcred, td); 2801 if (retv) break; 2802 } 2803 } 2804 2805 if (retv == NFSERR_STALEWRITEVERF) 2806 ncl_clearcommit(vp->v_mount); 2807 2808 /* 2809 * Now, either mark the blocks I/O done or mark the 2810 * blocks dirty, depending on whether the commit 2811 * succeeded. 2812 */ 2813 for (i = 0; i < bvecpos; i++) { 2814 bp = bvec[i]; 2815 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 2816 if (retv) { 2817 /* 2818 * Error, leave B_DELWRI intact 2819 */ 2820 vfs_unbusy_pages(bp); 2821 brelse(bp); 2822 } else { 2823 /* 2824 * Success, remove B_DELWRI ( bundirty() ). 2825 * 2826 * b_dirtyoff/b_dirtyend seem to be NFS 2827 * specific. We should probably move that 2828 * into bundirty(). XXX 2829 */ 2830 bufobj_wref(bo); 2831 bp->b_flags |= B_ASYNC; 2832 bundirty(bp); 2833 bp->b_flags &= ~B_DONE; 2834 bp->b_ioflags &= ~BIO_ERROR; 2835 bp->b_dirtyoff = bp->b_dirtyend = 0; 2836 bufdone(bp); 2837 } 2838 } 2839 } 2840 2841 /* 2842 * Start/do any write(s) that are required. 2843 */ 2844 loop: 2845 BO_LOCK(bo); 2846 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2847 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2848 if (waitfor != MNT_WAIT || passone) 2849 continue; 2850 2851 error = BUF_TIMELOCK(bp, 2852 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 2853 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo); 2854 if (error == 0) { 2855 BUF_UNLOCK(bp); 2856 goto loop; 2857 } 2858 if (error == ENOLCK) { 2859 error = 0; 2860 goto loop; 2861 } 2862 if (called_from_renewthread != 0) { 2863 /* 2864 * Return EIO so the flush will be retried 2865 * later. 2866 */ 2867 error = EIO; 2868 goto done; 2869 } 2870 if (newnfs_sigintr(nmp, td)) { 2871 error = EINTR; 2872 goto done; 2873 } 2874 if (slpflag == PCATCH) { 2875 slpflag = 0; 2876 slptimeo = 2 * hz; 2877 } 2878 goto loop; 2879 } 2880 if ((bp->b_flags & B_DELWRI) == 0) 2881 panic("nfs_fsync: not dirty"); 2882 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 2883 BUF_UNLOCK(bp); 2884 continue; 2885 } 2886 BO_UNLOCK(bo); 2887 bremfree(bp); 2888 if (passone || !commit) 2889 bp->b_flags |= B_ASYNC; 2890 else 2891 bp->b_flags |= B_ASYNC; 2892 bwrite(bp); 2893 if (newnfs_sigintr(nmp, td)) { 2894 error = EINTR; 2895 goto done; 2896 } 2897 goto loop; 2898 } 2899 if (passone) { 2900 passone = 0; 2901 BO_UNLOCK(bo); 2902 goto again; 2903 } 2904 if (waitfor == MNT_WAIT) { 2905 while (bo->bo_numoutput) { 2906 error = bufobj_wwait(bo, slpflag, slptimeo); 2907 if (error) { 2908 BO_UNLOCK(bo); 2909 if (called_from_renewthread != 0) { 2910 /* 2911 * Return EIO so that the flush will be 2912 * retried later. 2913 */ 2914 error = EIO; 2915 goto done; 2916 } 2917 error = newnfs_sigintr(nmp, td); 2918 if (error) 2919 goto done; 2920 if (slpflag == PCATCH) { 2921 slpflag = 0; 2922 slptimeo = 2 * hz; 2923 } 2924 BO_LOCK(bo); 2925 } 2926 } 2927 if (bo->bo_dirty.bv_cnt != 0 && commit) { 2928 BO_UNLOCK(bo); 2929 goto loop; 2930 } 2931 /* 2932 * Wait for all the async IO requests to drain 2933 */ 2934 BO_UNLOCK(bo); 2935 mtx_lock(&np->n_mtx); 2936 while (np->n_directio_asyncwr > 0) { 2937 np->n_flag |= NFSYNCWAIT; 2938 error = newnfs_msleep(td, &np->n_directio_asyncwr, 2939 &np->n_mtx, slpflag | (PRIBIO + 1), 2940 "nfsfsync", 0); 2941 if (error) { 2942 if (newnfs_sigintr(nmp, td)) { 2943 mtx_unlock(&np->n_mtx); 2944 error = EINTR; 2945 goto done; 2946 } 2947 } 2948 } 2949 mtx_unlock(&np->n_mtx); 2950 } else 2951 BO_UNLOCK(bo); 2952 if (NFSHASPNFS(nmp)) { 2953 nfscl_layoutcommit(vp, td); 2954 /* 2955 * Invalidate the attribute cache, since writes to a DS 2956 * won't update the size attribute. 2957 */ 2958 mtx_lock(&np->n_mtx); 2959 np->n_attrstamp = 0; 2960 } else 2961 mtx_lock(&np->n_mtx); 2962 if (np->n_flag & NWRITEERR) { 2963 error = np->n_error; 2964 np->n_flag &= ~NWRITEERR; 2965 } 2966 if (commit && bo->bo_dirty.bv_cnt == 0 && 2967 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) 2968 np->n_flag &= ~NMODIFIED; 2969 mtx_unlock(&np->n_mtx); 2970 done: 2971 if (bvec != NULL && bvec != bvec_on_stack) 2972 free(bvec, M_TEMP); 2973 if (error == 0 && commit != 0 && waitfor == MNT_WAIT && 2974 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0 || 2975 np->n_directio_asyncwr != 0) && trycnt++ < 5) { 2976 /* try, try again... */ 2977 passone = 1; 2978 wcred = NULL; 2979 bvec = NULL; 2980 bvecsize = 0; 2981 printf("try%d\n", trycnt); 2982 goto again; 2983 } 2984 return (error); 2985 } 2986 2987 /* 2988 * NFS advisory byte-level locks. 2989 */ 2990 static int 2991 nfs_advlock(struct vop_advlock_args *ap) 2992 { 2993 struct vnode *vp = ap->a_vp; 2994 struct ucred *cred; 2995 struct nfsnode *np = VTONFS(ap->a_vp); 2996 struct proc *p = (struct proc *)ap->a_id; 2997 struct thread *td = curthread; /* XXX */ 2998 struct vattr va; 2999 int ret, error = EOPNOTSUPP; 3000 u_quad_t size; 3001 3002 if (NFS_ISV4(vp) && (ap->a_flags & (F_POSIX | F_FLOCK)) != 0) { 3003 if (vp->v_type != VREG) 3004 return (EINVAL); 3005 if ((ap->a_flags & F_POSIX) != 0) 3006 cred = p->p_ucred; 3007 else 3008 cred = td->td_ucred; 3009 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY); 3010 if (vp->v_iflag & VI_DOOMED) { 3011 NFSVOPUNLOCK(vp, 0); 3012 return (EBADF); 3013 } 3014 3015 /* 3016 * If this is unlocking a write locked region, flush and 3017 * commit them before unlocking. This is required by 3018 * RFC3530 Sec. 9.3.2. 3019 */ 3020 if (ap->a_op == F_UNLCK && 3021 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id, 3022 ap->a_flags)) 3023 (void) ncl_flush(vp, MNT_WAIT, cred, td, 1, 0); 3024 3025 /* 3026 * Loop around doing the lock op, while a blocking lock 3027 * must wait for the lock op to succeed. 3028 */ 3029 do { 3030 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op, 3031 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags); 3032 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3033 ap->a_op == F_SETLK) { 3034 NFSVOPUNLOCK(vp, 0); 3035 error = nfs_catnap(PZERO | PCATCH, ret, 3036 "ncladvl"); 3037 if (error) 3038 return (EINTR); 3039 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY); 3040 if (vp->v_iflag & VI_DOOMED) { 3041 NFSVOPUNLOCK(vp, 0); 3042 return (EBADF); 3043 } 3044 } 3045 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) && 3046 ap->a_op == F_SETLK); 3047 if (ret == NFSERR_DENIED) { 3048 NFSVOPUNLOCK(vp, 0); 3049 return (EAGAIN); 3050 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) { 3051 NFSVOPUNLOCK(vp, 0); 3052 return (ret); 3053 } else if (ret != 0) { 3054 NFSVOPUNLOCK(vp, 0); 3055 return (EACCES); 3056 } 3057 3058 /* 3059 * Now, if we just got a lock, invalidate data in the buffer 3060 * cache, as required, so that the coherency conforms with 3061 * RFC3530 Sec. 9.3.2. 3062 */ 3063 if (ap->a_op == F_SETLK) { 3064 if ((np->n_flag & NMODIFIED) == 0) { 3065 np->n_attrstamp = 0; 3066 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3067 ret = VOP_GETATTR(vp, &va, cred); 3068 } 3069 if ((np->n_flag & NMODIFIED) || ret || 3070 np->n_change != va.va_filerev) { 3071 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1); 3072 np->n_attrstamp = 0; 3073 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 3074 ret = VOP_GETATTR(vp, &va, cred); 3075 if (!ret) { 3076 np->n_mtime = va.va_mtime; 3077 np->n_change = va.va_filerev; 3078 } 3079 } 3080 /* Mark that a file lock has been acquired. */ 3081 mtx_lock(&np->n_mtx); 3082 np->n_flag |= NHASBEENLOCKED; 3083 mtx_unlock(&np->n_mtx); 3084 } 3085 NFSVOPUNLOCK(vp, 0); 3086 return (0); 3087 } else if (!NFS_ISV4(vp)) { 3088 error = NFSVOPLOCK(vp, LK_SHARED); 3089 if (error) 3090 return (error); 3091 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3092 size = VTONFS(vp)->n_size; 3093 NFSVOPUNLOCK(vp, 0); 3094 error = lf_advlock(ap, &(vp->v_lockf), size); 3095 } else { 3096 if (nfs_advlock_p != NULL) 3097 error = nfs_advlock_p(ap); 3098 else { 3099 NFSVOPUNLOCK(vp, 0); 3100 error = ENOLCK; 3101 } 3102 } 3103 if (error == 0 && ap->a_op == F_SETLK) { 3104 /* Mark that a file lock has been acquired. */ 3105 mtx_lock(&np->n_mtx); 3106 np->n_flag |= NHASBEENLOCKED; 3107 mtx_unlock(&np->n_mtx); 3108 } 3109 } 3110 return (error); 3111 } 3112 3113 /* 3114 * NFS advisory byte-level locks. 3115 */ 3116 static int 3117 nfs_advlockasync(struct vop_advlockasync_args *ap) 3118 { 3119 struct vnode *vp = ap->a_vp; 3120 u_quad_t size; 3121 int error; 3122 3123 if (NFS_ISV4(vp)) 3124 return (EOPNOTSUPP); 3125 error = NFSVOPLOCK(vp, LK_SHARED); 3126 if (error) 3127 return (error); 3128 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3129 size = VTONFS(vp)->n_size; 3130 NFSVOPUNLOCK(vp, 0); 3131 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3132 } else { 3133 NFSVOPUNLOCK(vp, 0); 3134 error = EOPNOTSUPP; 3135 } 3136 return (error); 3137 } 3138 3139 /* 3140 * Print out the contents of an nfsnode. 3141 */ 3142 static int 3143 nfs_print(struct vop_print_args *ap) 3144 { 3145 struct vnode *vp = ap->a_vp; 3146 struct nfsnode *np = VTONFS(vp); 3147 3148 ncl_printf("\tfileid %ld fsid 0x%x", 3149 np->n_vattr.na_fileid, np->n_vattr.na_fsid); 3150 if (vp->v_type == VFIFO) 3151 fifo_printinfo(vp); 3152 printf("\n"); 3153 return (0); 3154 } 3155 3156 /* 3157 * This is the "real" nfs::bwrite(struct buf*). 3158 * We set B_CACHE if this is a VMIO buffer. 3159 */ 3160 int 3161 ncl_writebp(struct buf *bp, int force __unused, struct thread *td) 3162 { 3163 int s; 3164 int oldflags = bp->b_flags; 3165 #if 0 3166 int retv = 1; 3167 off_t off; 3168 #endif 3169 3170 BUF_ASSERT_HELD(bp); 3171 3172 if (bp->b_flags & B_INVAL) { 3173 brelse(bp); 3174 return(0); 3175 } 3176 3177 bp->b_flags |= B_CACHE; 3178 3179 /* 3180 * Undirty the bp. We will redirty it later if the I/O fails. 3181 */ 3182 3183 s = splbio(); 3184 bundirty(bp); 3185 bp->b_flags &= ~B_DONE; 3186 bp->b_ioflags &= ~BIO_ERROR; 3187 bp->b_iocmd = BIO_WRITE; 3188 3189 bufobj_wref(bp->b_bufobj); 3190 curthread->td_ru.ru_oublock++; 3191 splx(s); 3192 3193 /* 3194 * Note: to avoid loopback deadlocks, we do not 3195 * assign b_runningbufspace. 3196 */ 3197 vfs_busy_pages(bp, 1); 3198 3199 BUF_KERNPROC(bp); 3200 bp->b_iooffset = dbtob(bp->b_blkno); 3201 bstrategy(bp); 3202 3203 if( (oldflags & B_ASYNC) == 0) { 3204 int rtval = bufwait(bp); 3205 3206 if (oldflags & B_DELWRI) { 3207 s = splbio(); 3208 reassignbuf(bp); 3209 splx(s); 3210 } 3211 brelse(bp); 3212 return (rtval); 3213 } 3214 3215 return (0); 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 /* 3355 * Cloned from vop_stdlock(), and then the ugly hack added. 3356 */ 3357 static int 3358 nfs_lock1(struct vop_lock1_args *ap) 3359 { 3360 struct vnode *vp = ap->a_vp; 3361 int error = 0; 3362 3363 /* 3364 * Since vfs_hash_get() calls vget() and it will no longer work 3365 * for FreeBSD8 with flags == 0, I can only think of this horrible 3366 * hack to work around it. I call vfs_hash_get() with LK_EXCLOTHER 3367 * and then handle it here. All I want for this case is a v_usecount 3368 * on the vnode to use for recovery, while another thread might 3369 * hold a lock on the vnode. I have the other threads blocked, so 3370 * there isn't any race problem. 3371 */ 3372 if ((ap->a_flags & LK_TYPE_MASK) == LK_EXCLOTHER) { 3373 if ((ap->a_flags & LK_INTERLOCK) == 0) 3374 panic("ncllock1"); 3375 if ((vp->v_iflag & VI_DOOMED)) 3376 error = ENOENT; 3377 VI_UNLOCK(vp); 3378 return (error); 3379 } 3380 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp), 3381 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file, 3382 ap->a_line)); 3383 } 3384 3385 static int 3386 nfs_getacl(struct vop_getacl_args *ap) 3387 { 3388 int error; 3389 3390 if (ap->a_type != ACL_TYPE_NFS4) 3391 return (EOPNOTSUPP); 3392 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3393 NULL); 3394 if (error > NFSERR_STALE) { 3395 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3396 error = EPERM; 3397 } 3398 return (error); 3399 } 3400 3401 static int 3402 nfs_setacl(struct vop_setacl_args *ap) 3403 { 3404 int error; 3405 3406 if (ap->a_type != ACL_TYPE_NFS4) 3407 return (EOPNOTSUPP); 3408 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp, 3409 NULL); 3410 if (error > NFSERR_STALE) { 3411 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0); 3412 error = EPERM; 3413 } 3414 return (error); 3415 } 3416 3417 /* 3418 * Return POSIX pathconf information applicable to nfs filesystems. 3419 */ 3420 static int 3421 nfs_pathconf(struct vop_pathconf_args *ap) 3422 { 3423 struct nfsv3_pathconf pc; 3424 struct nfsvattr nfsva; 3425 struct vnode *vp = ap->a_vp; 3426 struct thread *td = curthread; 3427 int attrflag, error; 3428 3429 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX || 3430 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED || 3431 ap->a_name == _PC_NO_TRUNC)) || 3432 (NFS_ISV4(vp) && ap->a_name == _PC_ACL_NFS4)) { 3433 /* 3434 * Since only the above 4 a_names are returned by the NFSv3 3435 * Pathconf RPC, there is no point in doing it for others. 3436 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can 3437 * be used for _PC_NFS4_ACL as well. 3438 */ 3439 error = nfsrpc_pathconf(vp, &pc, td->td_ucred, td, &nfsva, 3440 &attrflag, NULL); 3441 if (attrflag != 0) 3442 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, NULL, 0, 3443 1); 3444 if (error != 0) 3445 return (error); 3446 } else { 3447 /* 3448 * For NFSv2 (or NFSv3 when not one of the above 4 a_names), 3449 * just fake them. 3450 */ 3451 pc.pc_linkmax = LINK_MAX; 3452 pc.pc_namemax = NFS_MAXNAMLEN; 3453 pc.pc_notrunc = 1; 3454 pc.pc_chownrestricted = 1; 3455 pc.pc_caseinsensitive = 0; 3456 pc.pc_casepreserving = 1; 3457 error = 0; 3458 } 3459 switch (ap->a_name) { 3460 case _PC_LINK_MAX: 3461 *ap->a_retval = pc.pc_linkmax; 3462 break; 3463 case _PC_NAME_MAX: 3464 *ap->a_retval = pc.pc_namemax; 3465 break; 3466 case _PC_PATH_MAX: 3467 *ap->a_retval = PATH_MAX; 3468 break; 3469 case _PC_PIPE_BUF: 3470 *ap->a_retval = PIPE_BUF; 3471 break; 3472 case _PC_CHOWN_RESTRICTED: 3473 *ap->a_retval = pc.pc_chownrestricted; 3474 break; 3475 case _PC_NO_TRUNC: 3476 *ap->a_retval = pc.pc_notrunc; 3477 break; 3478 case _PC_ACL_EXTENDED: 3479 *ap->a_retval = 0; 3480 break; 3481 case _PC_ACL_NFS4: 3482 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 && 3483 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL)) 3484 *ap->a_retval = 1; 3485 else 3486 *ap->a_retval = 0; 3487 break; 3488 case _PC_ACL_PATH_MAX: 3489 if (NFS_ISV4(vp)) 3490 *ap->a_retval = ACL_MAX_ENTRIES; 3491 else 3492 *ap->a_retval = 3; 3493 break; 3494 case _PC_MAC_PRESENT: 3495 *ap->a_retval = 0; 3496 break; 3497 case _PC_ASYNC_IO: 3498 /* _PC_ASYNC_IO should have been handled by upper layers. */ 3499 KASSERT(0, ("_PC_ASYNC_IO should not get here")); 3500 error = EINVAL; 3501 break; 3502 case _PC_PRIO_IO: 3503 *ap->a_retval = 0; 3504 break; 3505 case _PC_SYNC_IO: 3506 *ap->a_retval = 0; 3507 break; 3508 case _PC_ALLOC_SIZE_MIN: 3509 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize; 3510 break; 3511 case _PC_FILESIZEBITS: 3512 if (NFS_ISV34(vp)) 3513 *ap->a_retval = 64; 3514 else 3515 *ap->a_retval = 32; 3516 break; 3517 case _PC_REC_INCR_XFER_SIZE: 3518 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 3519 break; 3520 case _PC_REC_MAX_XFER_SIZE: 3521 *ap->a_retval = -1; /* means ``unlimited'' */ 3522 break; 3523 case _PC_REC_MIN_XFER_SIZE: 3524 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize; 3525 break; 3526 case _PC_REC_XFER_ALIGN: 3527 *ap->a_retval = PAGE_SIZE; 3528 break; 3529 case _PC_SYMLINK_MAX: 3530 *ap->a_retval = NFS_MAXPATHLEN; 3531 break; 3532 3533 default: 3534 error = EINVAL; 3535 break; 3536 } 3537 return (error); 3538 } 3539
Cache object: 1273ec92185f4ed81dfa1f4983a206be
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