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sys/nfsclient/nfs_vnops.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 * @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD: releng/8.1/sys/nfsclient/nfs_vnops.c 209003 2010-06-10 20:13:03Z jhb $"); 37 38 /* 39 * vnode op calls for Sun NFS version 2 and 3 40 */ 41 42 #include "opt_inet.h" 43 #include "opt_kdtrace.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_object.h> 68 #include <vm/vm_extern.h> 69 #include <vm/vm_object.h> 70 71 #include <fs/fifofs/fifo.h> 72 73 #include <nfs/nfsproto.h> 74 #include <nfsclient/nfs.h> 75 #include <nfsclient/nfsnode.h> 76 #include <nfsclient/nfsmount.h> 77 #include <nfsclient/nfs_kdtrace.h> 78 #include <nfsclient/nfs_lock.h> 79 #include <nfs/xdr_subs.h> 80 #include <nfsclient/nfsm_subs.h> 81 82 #include <net/if.h> 83 #include <netinet/in.h> 84 #include <netinet/in_var.h> 85 86 #include <machine/stdarg.h> 87 88 #ifdef KDTRACE_HOOKS 89 #include <sys/dtrace_bsd.h> 90 91 dtrace_nfsclient_accesscache_flush_probe_func_t 92 dtrace_nfsclient_accesscache_flush_done_probe; 93 uint32_t nfsclient_accesscache_flush_done_id; 94 95 dtrace_nfsclient_accesscache_get_probe_func_t 96 dtrace_nfsclient_accesscache_get_hit_probe, 97 dtrace_nfsclient_accesscache_get_miss_probe; 98 uint32_t nfsclient_accesscache_get_hit_id; 99 uint32_t nfsclient_accesscache_get_miss_id; 100 101 dtrace_nfsclient_accesscache_load_probe_func_t 102 dtrace_nfsclient_accesscache_load_done_probe; 103 uint32_t nfsclient_accesscache_load_done_id; 104 #endif /* !KDTRACE_HOOKS */ 105 106 /* Defs */ 107 #define TRUE 1 108 #define FALSE 0 109 110 /* 111 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these 112 * calls are not in getblk() and brelse() so that they would not be necessary 113 * here. 114 */ 115 #ifndef B_VMIO 116 #define vfs_busy_pages(bp, f) 117 #endif 118 119 static vop_read_t nfsfifo_read; 120 static vop_write_t nfsfifo_write; 121 static vop_close_t nfsfifo_close; 122 static int nfs_flush(struct vnode *, int, int); 123 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *); 124 static vop_lookup_t nfs_lookup; 125 static vop_create_t nfs_create; 126 static vop_mknod_t nfs_mknod; 127 static vop_open_t nfs_open; 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 int nfs_lookitup(struct vnode *, const char *, int, 143 struct ucred *, struct thread *, struct nfsnode **); 144 static int nfs_sillyrename(struct vnode *, struct vnode *, 145 struct componentname *); 146 static vop_access_t nfsspec_access; 147 static vop_readlink_t nfs_readlink; 148 static vop_print_t nfs_print; 149 static vop_advlock_t nfs_advlock; 150 static vop_advlockasync_t nfs_advlockasync; 151 152 /* 153 * Global vfs data structures for nfs 154 */ 155 struct vop_vector nfs_vnodeops = { 156 .vop_default = &default_vnodeops, 157 .vop_access = nfs_access, 158 .vop_advlock = nfs_advlock, 159 .vop_advlockasync = nfs_advlockasync, 160 .vop_close = nfs_close, 161 .vop_create = nfs_create, 162 .vop_fsync = nfs_fsync, 163 .vop_getattr = nfs_getattr, 164 .vop_getpages = nfs_getpages, 165 .vop_putpages = nfs_putpages, 166 .vop_inactive = nfs_inactive, 167 .vop_link = nfs_link, 168 .vop_lookup = nfs_lookup, 169 .vop_mkdir = nfs_mkdir, 170 .vop_mknod = nfs_mknod, 171 .vop_open = nfs_open, 172 .vop_print = nfs_print, 173 .vop_read = nfs_read, 174 .vop_readdir = nfs_readdir, 175 .vop_readlink = nfs_readlink, 176 .vop_reclaim = nfs_reclaim, 177 .vop_remove = nfs_remove, 178 .vop_rename = nfs_rename, 179 .vop_rmdir = nfs_rmdir, 180 .vop_setattr = nfs_setattr, 181 .vop_strategy = nfs_strategy, 182 .vop_symlink = nfs_symlink, 183 .vop_write = nfs_write, 184 }; 185 186 struct vop_vector nfs_fifoops = { 187 .vop_default = &fifo_specops, 188 .vop_access = nfsspec_access, 189 .vop_close = nfsfifo_close, 190 .vop_fsync = nfs_fsync, 191 .vop_getattr = nfs_getattr, 192 .vop_inactive = nfs_inactive, 193 .vop_print = nfs_print, 194 .vop_read = nfsfifo_read, 195 .vop_reclaim = nfs_reclaim, 196 .vop_setattr = nfs_setattr, 197 .vop_write = nfsfifo_write, 198 }; 199 200 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 201 struct componentname *cnp, struct vattr *vap); 202 static int nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 203 struct ucred *cred, struct thread *td); 204 static int nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, 205 int fnamelen, struct vnode *tdvp, 206 const char *tnameptr, int tnamelen, 207 struct ucred *cred, struct thread *td); 208 static int nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 209 struct sillyrename *sp); 210 211 /* 212 * Global variables 213 */ 214 struct mtx nfs_iod_mtx; 215 enum nfsiod_state nfs_iodwant[NFS_MAXASYNCDAEMON]; 216 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; 217 int nfs_numasync = 0; 218 vop_advlock_t *nfs_advlock_p = nfs_dolock; 219 vop_reclaim_t *nfs_reclaim_p = NULL; 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 nfsv3_commit_on_close = 0; 234 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 235 &nfsv3_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 nfs_directio_enable = 0; 242 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 243 &nfs_directio_enable, 0, "Enable NFS directio"); 244 245 /* 246 * This sysctl allows other processes to mmap a file that has been opened 247 * O_DIRECT by a process. In general, having processes mmap the file while 248 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 249 * this by default to prevent DoS attacks - to prevent a malicious user from 250 * opening up files O_DIRECT preventing other users from mmap'ing these 251 * files. "Protected" environments where stricter consistency guarantees are 252 * required can disable this knob. The process that opened the file O_DIRECT 253 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 254 * meaningful. 255 */ 256 int nfs_directio_allow_mmap = 1; 257 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 258 &nfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 259 260 #if 0 261 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 262 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 263 264 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 265 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 266 #endif 267 268 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 269 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 270 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 271 272 /* 273 * SMP Locking Note : 274 * The list of locks after the description of the lock is the ordering 275 * of other locks acquired with the lock held. 276 * np->n_mtx : Protects the fields in the nfsnode. 277 VM Object Lock 278 VI_MTX (acquired indirectly) 279 * nmp->nm_mtx : Protects the fields in the nfsmount. 280 rep->r_mtx 281 * nfs_iod_mtx : Global lock, protects shared nfsiod state. 282 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. 283 nmp->nm_mtx 284 rep->r_mtx 285 * rep->r_mtx : Protects the fields in an nfsreq. 286 */ 287 288 static int 289 nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td, 290 struct ucred *cred, uint32_t *retmode) 291 { 292 const int v3 = 1; 293 u_int32_t *tl; 294 int error = 0, attrflag, i, lrupos; 295 296 struct mbuf *mreq, *mrep, *md, *mb; 297 caddr_t bpos, dpos; 298 u_int32_t rmode; 299 struct nfsnode *np = VTONFS(vp); 300 301 nfsstats.rpccnt[NFSPROC_ACCESS]++; 302 mreq = nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 303 mb = mreq; 304 bpos = mtod(mb, caddr_t); 305 nfsm_fhtom(vp, v3); 306 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 307 *tl = txdr_unsigned(wmode); 308 nfsm_request(vp, NFSPROC_ACCESS, td, cred); 309 nfsm_postop_attr(vp, attrflag); 310 if (!error) { 311 lrupos = 0; 312 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 313 rmode = fxdr_unsigned(u_int32_t, *tl); 314 mtx_lock(&np->n_mtx); 315 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 316 if (np->n_accesscache[i].uid == cred->cr_uid) { 317 np->n_accesscache[i].mode = rmode; 318 np->n_accesscache[i].stamp = time_second; 319 break; 320 } 321 if (i > 0 && np->n_accesscache[i].stamp < 322 np->n_accesscache[lrupos].stamp) 323 lrupos = i; 324 } 325 if (i == NFS_ACCESSCACHESIZE) { 326 np->n_accesscache[lrupos].uid = cred->cr_uid; 327 np->n_accesscache[lrupos].mode = rmode; 328 np->n_accesscache[lrupos].stamp = time_second; 329 } 330 mtx_unlock(&np->n_mtx); 331 if (retmode != NULL) 332 *retmode = rmode; 333 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0); 334 } 335 m_freem(mrep); 336 nfsmout: 337 #ifdef KDTRACE_HOOKS 338 if (error) { 339 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0, 340 error); 341 } 342 #endif 343 return (error); 344 } 345 346 /* 347 * nfs access vnode op. 348 * For nfs version 2, just return ok. File accesses may fail later. 349 * For nfs version 3, use the access rpc to check accessibility. If file modes 350 * are changed on the server, accesses might still fail later. 351 */ 352 static int 353 nfs_access(struct vop_access_args *ap) 354 { 355 struct vnode *vp = ap->a_vp; 356 int error = 0, i, gotahit; 357 u_int32_t mode, rmode, wmode; 358 int v3 = NFS_ISV3(vp); 359 struct nfsnode *np = VTONFS(vp); 360 361 /* 362 * Disallow write attempts on filesystems mounted read-only; 363 * unless the file is a socket, fifo, or a block or character 364 * device resident on the filesystem. 365 */ 366 if ((ap->a_accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 367 switch (vp->v_type) { 368 case VREG: 369 case VDIR: 370 case VLNK: 371 return (EROFS); 372 default: 373 break; 374 } 375 } 376 /* 377 * For nfs v3, check to see if we have done this recently, and if 378 * so return our cached result instead of making an ACCESS call. 379 * If not, do an access rpc, otherwise you are stuck emulating 380 * ufs_access() locally using the vattr. This may not be correct, 381 * since the server may apply other access criteria such as 382 * client uid-->server uid mapping that we do not know about. 383 */ 384 if (v3) { 385 if (ap->a_accmode & VREAD) 386 mode = NFSV3ACCESS_READ; 387 else 388 mode = 0; 389 if (vp->v_type != VDIR) { 390 if (ap->a_accmode & VWRITE) 391 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 392 if (ap->a_accmode & VEXEC) 393 mode |= NFSV3ACCESS_EXECUTE; 394 } else { 395 if (ap->a_accmode & VWRITE) 396 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 397 NFSV3ACCESS_DELETE); 398 if (ap->a_accmode & VEXEC) 399 mode |= NFSV3ACCESS_LOOKUP; 400 } 401 /* XXX safety belt, only make blanket request if caching */ 402 if (nfsaccess_cache_timeout > 0) { 403 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 404 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 405 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 406 } else { 407 wmode = mode; 408 } 409 410 /* 411 * Does our cached result allow us to give a definite yes to 412 * this request? 413 */ 414 gotahit = 0; 415 mtx_lock(&np->n_mtx); 416 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { 417 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) { 418 if (time_second < (np->n_accesscache[i].stamp + 419 nfsaccess_cache_timeout) && 420 (np->n_accesscache[i].mode & mode) == mode) { 421 nfsstats.accesscache_hits++; 422 gotahit = 1; 423 } 424 break; 425 } 426 } 427 mtx_unlock(&np->n_mtx); 428 #ifdef KDTRACE_HOOKS 429 if (gotahit) 430 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp, 431 ap->a_cred->cr_uid, mode); 432 else 433 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp, 434 ap->a_cred->cr_uid, mode); 435 #endif 436 if (gotahit == 0) { 437 /* 438 * Either a no, or a don't know. Go to the wire. 439 */ 440 nfsstats.accesscache_misses++; 441 error = nfs3_access_otw(vp, wmode, ap->a_td, ap->a_cred, 442 &rmode); 443 if (!error) { 444 if ((rmode & mode) != mode) 445 error = EACCES; 446 } 447 } 448 return (error); 449 } else { 450 if ((error = nfsspec_access(ap)) != 0) { 451 return (error); 452 } 453 /* 454 * Attempt to prevent a mapped root from accessing a file 455 * which it shouldn't. We try to read a byte from the file 456 * if the user is root and the file is not zero length. 457 * After calling nfsspec_access, we should have the correct 458 * file size cached. 459 */ 460 mtx_lock(&np->n_mtx); 461 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD) 462 && VTONFS(vp)->n_size > 0) { 463 struct iovec aiov; 464 struct uio auio; 465 char buf[1]; 466 467 mtx_unlock(&np->n_mtx); 468 aiov.iov_base = buf; 469 aiov.iov_len = 1; 470 auio.uio_iov = &aiov; 471 auio.uio_iovcnt = 1; 472 auio.uio_offset = 0; 473 auio.uio_resid = 1; 474 auio.uio_segflg = UIO_SYSSPACE; 475 auio.uio_rw = UIO_READ; 476 auio.uio_td = ap->a_td; 477 478 if (vp->v_type == VREG) 479 error = nfs_readrpc(vp, &auio, ap->a_cred); 480 else if (vp->v_type == VDIR) { 481 char* bp; 482 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 483 aiov.iov_base = bp; 484 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 485 error = nfs_readdirrpc(vp, &auio, ap->a_cred); 486 free(bp, M_TEMP); 487 } else if (vp->v_type == VLNK) 488 error = nfs_readlinkrpc(vp, &auio, ap->a_cred); 489 else 490 error = EACCES; 491 } else 492 mtx_unlock(&np->n_mtx); 493 return (error); 494 } 495 } 496 497 int nfs_otw_getattr_avoid = 0; 498 499 /* 500 * nfs open vnode op 501 * Check to see if the type is ok 502 * and that deletion is not in progress. 503 * For paged in text files, you will need to flush the page cache 504 * if consistency is lost. 505 */ 506 /* ARGSUSED */ 507 static int 508 nfs_open(struct vop_open_args *ap) 509 { 510 struct vnode *vp = ap->a_vp; 511 struct nfsnode *np = VTONFS(vp); 512 struct vattr vattr; 513 int error; 514 int fmode = ap->a_mode; 515 516 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 517 return (EOPNOTSUPP); 518 519 /* 520 * Get a valid lease. If cached data is stale, flush it. 521 */ 522 mtx_lock(&np->n_mtx); 523 if (np->n_flag & NMODIFIED) { 524 mtx_unlock(&np->n_mtx); 525 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 526 if (error == EINTR || error == EIO) 527 return (error); 528 np->n_attrstamp = 0; 529 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 530 if (vp->v_type == VDIR) 531 np->n_direofoffset = 0; 532 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 533 if (error) 534 return (error); 535 mtx_lock(&np->n_mtx); 536 np->n_mtime = vattr.va_mtime; 537 mtx_unlock(&np->n_mtx); 538 } else { 539 struct thread *td = curthread; 540 541 if (np->n_ac_ts_syscalls != td->td_syscalls || 542 np->n_ac_ts_tid != td->td_tid || 543 td->td_proc == NULL || 544 np->n_ac_ts_pid != td->td_proc->p_pid) { 545 np->n_attrstamp = 0; 546 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 547 } 548 mtx_unlock(&np->n_mtx); 549 error = VOP_GETATTR(vp, &vattr, ap->a_cred); 550 if (error) 551 return (error); 552 mtx_lock(&np->n_mtx); 553 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 554 if (vp->v_type == VDIR) 555 np->n_direofoffset = 0; 556 mtx_unlock(&np->n_mtx); 557 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 558 if (error == EINTR || error == EIO) { 559 return (error); 560 } 561 mtx_lock(&np->n_mtx); 562 np->n_mtime = vattr.va_mtime; 563 } 564 mtx_unlock(&np->n_mtx); 565 } 566 /* 567 * If the object has >= 1 O_DIRECT active opens, we disable caching. 568 */ 569 if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 570 if (np->n_directio_opens == 0) { 571 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 572 if (error) 573 return (error); 574 mtx_lock(&np->n_mtx); 575 np->n_flag |= NNONCACHE; 576 mtx_unlock(&np->n_mtx); 577 } 578 np->n_directio_opens++; 579 } 580 vnode_create_vobject(vp, vattr.va_size, ap->a_td); 581 return (0); 582 } 583 584 /* 585 * nfs close vnode op 586 * What an NFS client should do upon close after writing is a debatable issue. 587 * Most NFS clients push delayed writes to the server upon close, basically for 588 * two reasons: 589 * 1 - So that any write errors may be reported back to the client process 590 * doing the close system call. By far the two most likely errors are 591 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 592 * 2 - To put a worst case upper bound on cache inconsistency between 593 * multiple clients for the file. 594 * There is also a consistency problem for Version 2 of the protocol w.r.t. 595 * not being able to tell if other clients are writing a file concurrently, 596 * since there is no way of knowing if the changed modify time in the reply 597 * is only due to the write for this client. 598 * (NFS Version 3 provides weak cache consistency data in the reply that 599 * should be sufficient to detect and handle this case.) 600 * 601 * The current code does the following: 602 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 603 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 604 * or commit them (this satisfies 1 and 2 except for the 605 * case where the server crashes after this close but 606 * before the commit RPC, which is felt to be "good 607 * enough". Changing the last argument to nfs_flush() to 608 * a 1 would force a commit operation, if it is felt a 609 * commit is necessary now. 610 */ 611 /* ARGSUSED */ 612 static int 613 nfs_close(struct vop_close_args *ap) 614 { 615 struct vnode *vp = ap->a_vp; 616 struct nfsnode *np = VTONFS(vp); 617 int error = 0; 618 int fmode = ap->a_fflag; 619 620 if (vp->v_type == VREG) { 621 /* 622 * Examine and clean dirty pages, regardless of NMODIFIED. 623 * This closes a major hole in close-to-open consistency. 624 * We want to push out all dirty pages (and buffers) on 625 * close, regardless of whether they were dirtied by 626 * mmap'ed writes or via write(). 627 */ 628 if (nfs_clean_pages_on_close && vp->v_object) { 629 VM_OBJECT_LOCK(vp->v_object); 630 vm_object_page_clean(vp->v_object, 0, 0, 0); 631 VM_OBJECT_UNLOCK(vp->v_object); 632 } 633 mtx_lock(&np->n_mtx); 634 if (np->n_flag & NMODIFIED) { 635 mtx_unlock(&np->n_mtx); 636 if (NFS_ISV3(vp)) { 637 /* 638 * Under NFSv3 we have dirty buffers to dispose of. We 639 * must flush them to the NFS server. We have the option 640 * of waiting all the way through the commit rpc or just 641 * waiting for the initial write. The default is to only 642 * wait through the initial write so the data is in the 643 * server's cache, which is roughly similar to the state 644 * a standard disk subsystem leaves the file in on close(). 645 * 646 * We cannot clear the NMODIFIED bit in np->n_flag due to 647 * potential races with other processes, and certainly 648 * cannot clear it if we don't commit. 649 */ 650 int cm = nfsv3_commit_on_close ? 1 : 0; 651 error = nfs_flush(vp, MNT_WAIT, cm); 652 /* np->n_flag &= ~NMODIFIED; */ 653 } else 654 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 655 mtx_lock(&np->n_mtx); 656 } 657 if (np->n_flag & NWRITEERR) { 658 np->n_flag &= ~NWRITEERR; 659 error = np->n_error; 660 } 661 mtx_unlock(&np->n_mtx); 662 } 663 if (nfs_directio_enable) 664 KASSERT((np->n_directio_asyncwr == 0), 665 ("nfs_close: dirty unflushed (%d) directio buffers\n", 666 np->n_directio_asyncwr)); 667 if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 668 mtx_lock(&np->n_mtx); 669 KASSERT((np->n_directio_opens > 0), 670 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 671 np->n_directio_opens--; 672 if (np->n_directio_opens == 0) 673 np->n_flag &= ~NNONCACHE; 674 mtx_unlock(&np->n_mtx); 675 } 676 return (error); 677 } 678 679 /* 680 * nfs getattr call from vfs. 681 */ 682 static int 683 nfs_getattr(struct vop_getattr_args *ap) 684 { 685 struct vnode *vp = ap->a_vp; 686 struct nfsnode *np = VTONFS(vp); 687 struct thread *td = curthread; 688 struct vattr *vap = ap->a_vap; 689 struct vattr vattr; 690 caddr_t bpos, dpos; 691 int error = 0; 692 struct mbuf *mreq, *mrep, *md, *mb; 693 int v3 = NFS_ISV3(vp); 694 695 /* 696 * Update local times for special files. 697 */ 698 mtx_lock(&np->n_mtx); 699 if (np->n_flag & (NACC | NUPD)) 700 np->n_flag |= NCHG; 701 mtx_unlock(&np->n_mtx); 702 /* 703 * First look in the cache. 704 */ 705 if (nfs_getattrcache(vp, &vattr) == 0) 706 goto nfsmout; 707 if (v3 && nfs_prime_access_cache && nfsaccess_cache_timeout > 0) { 708 nfsstats.accesscache_misses++; 709 nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, ap->a_cred, NULL); 710 if (nfs_getattrcache(vp, &vattr) == 0) 711 goto nfsmout; 712 } 713 nfsstats.rpccnt[NFSPROC_GETATTR]++; 714 mreq = nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); 715 mb = mreq; 716 bpos = mtod(mb, caddr_t); 717 nfsm_fhtom(vp, v3); 718 nfsm_request(vp, NFSPROC_GETATTR, td, ap->a_cred); 719 if (!error) { 720 nfsm_loadattr(vp, &vattr); 721 } 722 m_freem(mrep); 723 nfsmout: 724 vap->va_type = vattr.va_type; 725 vap->va_mode = vattr.va_mode; 726 vap->va_nlink = vattr.va_nlink; 727 vap->va_uid = vattr.va_uid; 728 vap->va_gid = vattr.va_gid; 729 vap->va_fsid = vattr.va_fsid; 730 vap->va_fileid = vattr.va_fileid; 731 vap->va_size = vattr.va_size; 732 vap->va_blocksize = vattr.va_blocksize; 733 vap->va_atime = vattr.va_atime; 734 vap->va_mtime = vattr.va_mtime; 735 vap->va_ctime = vattr.va_ctime; 736 vap->va_gen = vattr.va_gen; 737 vap->va_flags = vattr.va_flags; 738 vap->va_rdev = vattr.va_rdev; 739 vap->va_bytes = vattr.va_bytes; 740 vap->va_filerev = vattr.va_filerev; 741 742 return (error); 743 } 744 745 /* 746 * nfs setattr call. 747 */ 748 static int 749 nfs_setattr(struct vop_setattr_args *ap) 750 { 751 struct vnode *vp = ap->a_vp; 752 struct nfsnode *np = VTONFS(vp); 753 struct vattr *vap = ap->a_vap; 754 struct thread *td = curthread; 755 int error = 0; 756 u_quad_t tsize; 757 758 #ifndef nolint 759 tsize = (u_quad_t)0; 760 #endif 761 762 /* 763 * Setting of flags is not supported. 764 */ 765 if (vap->va_flags != VNOVAL) 766 return (EOPNOTSUPP); 767 768 /* 769 * Disallow write attempts if the filesystem is mounted read-only. 770 */ 771 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 772 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 773 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 774 (vp->v_mount->mnt_flag & MNT_RDONLY)) { 775 error = EROFS; 776 goto out; 777 } 778 if (vap->va_size != VNOVAL) { 779 switch (vp->v_type) { 780 case VDIR: 781 return (EISDIR); 782 case VCHR: 783 case VBLK: 784 case VSOCK: 785 case VFIFO: 786 if (vap->va_mtime.tv_sec == VNOVAL && 787 vap->va_atime.tv_sec == VNOVAL && 788 vap->va_mode == (mode_t)VNOVAL && 789 vap->va_uid == (uid_t)VNOVAL && 790 vap->va_gid == (gid_t)VNOVAL) 791 return (0); 792 vap->va_size = VNOVAL; 793 break; 794 default: 795 /* 796 * Disallow write attempts if the filesystem is 797 * mounted read-only. 798 */ 799 if (vp->v_mount->mnt_flag & MNT_RDONLY) 800 return (EROFS); 801 /* 802 * We run vnode_pager_setsize() early (why?), 803 * we must set np->n_size now to avoid vinvalbuf 804 * V_SAVE races that might setsize a lower 805 * value. 806 */ 807 mtx_lock(&np->n_mtx); 808 tsize = np->n_size; 809 mtx_unlock(&np->n_mtx); 810 error = nfs_meta_setsize(vp, ap->a_cred, td, 811 vap->va_size); 812 mtx_lock(&np->n_mtx); 813 if (np->n_flag & NMODIFIED) { 814 tsize = np->n_size; 815 mtx_unlock(&np->n_mtx); 816 if (vap->va_size == 0) 817 error = nfs_vinvalbuf(vp, 0, td, 1); 818 else 819 error = nfs_vinvalbuf(vp, V_SAVE, td, 1); 820 if (error) { 821 vnode_pager_setsize(vp, tsize); 822 goto out; 823 } 824 } else 825 mtx_unlock(&np->n_mtx); 826 /* 827 * np->n_size has already been set to vap->va_size 828 * in nfs_meta_setsize(). We must set it again since 829 * nfs_loadattrcache() could be called through 830 * nfs_meta_setsize() and could modify np->n_size. 831 */ 832 mtx_lock(&np->n_mtx); 833 np->n_vattr.va_size = np->n_size = vap->va_size; 834 mtx_unlock(&np->n_mtx); 835 }; 836 } else { 837 mtx_lock(&np->n_mtx); 838 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && 839 (np->n_flag & NMODIFIED) && vp->v_type == VREG) { 840 mtx_unlock(&np->n_mtx); 841 if ((error = nfs_vinvalbuf(vp, V_SAVE, td, 1)) != 0 && 842 (error == EINTR || error == EIO)) 843 return error; 844 } else 845 mtx_unlock(&np->n_mtx); 846 } 847 error = nfs_setattrrpc(vp, vap, ap->a_cred); 848 if (error && vap->va_size != VNOVAL) { 849 mtx_lock(&np->n_mtx); 850 np->n_size = np->n_vattr.va_size = tsize; 851 vnode_pager_setsize(vp, tsize); 852 mtx_unlock(&np->n_mtx); 853 } 854 out: 855 return (error); 856 } 857 858 /* 859 * Do an nfs setattr rpc. 860 */ 861 static int 862 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred) 863 { 864 struct nfsv2_sattr *sp; 865 struct nfsnode *np = VTONFS(vp); 866 caddr_t bpos, dpos; 867 u_int32_t *tl; 868 int error = 0, i, wccflag = NFSV3_WCCRATTR; 869 struct mbuf *mreq, *mrep, *md, *mb; 870 int v3 = NFS_ISV3(vp); 871 872 nfsstats.rpccnt[NFSPROC_SETATTR]++; 873 mreq = nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 874 mb = mreq; 875 bpos = mtod(mb, caddr_t); 876 nfsm_fhtom(vp, v3); 877 if (v3) { 878 nfsm_v3attrbuild(vap, TRUE); 879 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 880 *tl = nfs_false; 881 } else { 882 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 883 if (vap->va_mode == (mode_t)VNOVAL) 884 sp->sa_mode = nfs_xdrneg1; 885 else 886 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 887 if (vap->va_uid == (uid_t)VNOVAL) 888 sp->sa_uid = nfs_xdrneg1; 889 else 890 sp->sa_uid = txdr_unsigned(vap->va_uid); 891 if (vap->va_gid == (gid_t)VNOVAL) 892 sp->sa_gid = nfs_xdrneg1; 893 else 894 sp->sa_gid = txdr_unsigned(vap->va_gid); 895 sp->sa_size = txdr_unsigned(vap->va_size); 896 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 897 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 898 } 899 nfsm_request(vp, NFSPROC_SETATTR, curthread, cred); 900 if (v3) { 901 mtx_lock(&np->n_mtx); 902 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) 903 np->n_accesscache[i].stamp = 0; 904 mtx_unlock(&np->n_mtx); 905 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); 906 nfsm_wcc_data(vp, wccflag); 907 } else 908 nfsm_loadattr(vp, NULL); 909 m_freem(mrep); 910 nfsmout: 911 return (error); 912 } 913 914 /* 915 * nfs lookup call, one step at a time... 916 * First look in cache 917 * If not found, unlock the directory nfsnode and do the rpc 918 */ 919 static int 920 nfs_lookup(struct vop_lookup_args *ap) 921 { 922 struct componentname *cnp = ap->a_cnp; 923 struct vnode *dvp = ap->a_dvp; 924 struct vnode **vpp = ap->a_vpp; 925 struct mount *mp = dvp->v_mount; 926 struct vattr vattr; 927 time_t dmtime; 928 int flags = cnp->cn_flags; 929 struct vnode *newvp; 930 struct nfsmount *nmp; 931 caddr_t bpos, dpos; 932 struct mbuf *mreq, *mrep, *md, *mb; 933 long len; 934 nfsfh_t *fhp; 935 struct nfsnode *np, *newnp; 936 int error = 0, attrflag, fhsize, ltype; 937 int v3 = NFS_ISV3(dvp); 938 struct thread *td = cnp->cn_thread; 939 940 *vpp = NULLVP; 941 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) && 942 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 943 return (EROFS); 944 if (dvp->v_type != VDIR) 945 return (ENOTDIR); 946 nmp = VFSTONFS(mp); 947 np = VTONFS(dvp); 948 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) { 949 *vpp = NULLVP; 950 return (error); 951 } 952 error = cache_lookup(dvp, vpp, cnp); 953 if (error > 0 && error != ENOENT) 954 return (error); 955 if (error == -1) { 956 /* 957 * We only accept a positive hit in the cache if the 958 * change time of the file matches our cached copy. 959 * Otherwise, we discard the cache entry and fallback 960 * to doing a lookup RPC. 961 * 962 * To better handle stale file handles and attributes, 963 * clear the attribute cache of this node if it is a 964 * leaf component, part of an open() call, and not 965 * locally modified before fetching the attributes. 966 * This should allow stale file handles to be detected 967 * here where we can fall back to a LOOKUP RPC to 968 * recover rather than having nfs_open() detect the 969 * stale file handle and failing open(2) with ESTALE. 970 */ 971 newvp = *vpp; 972 newnp = VTONFS(newvp); 973 if ((cnp->cn_flags & (ISLASTCN | ISOPEN)) == 974 (ISLASTCN | ISOPEN) && !(newnp->n_flag & NMODIFIED)) { 975 mtx_lock(&newnp->n_mtx); 976 newnp->n_attrstamp = 0; 977 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); 978 mtx_unlock(&newnp->n_mtx); 979 } 980 if (VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 && 981 vattr.va_ctime.tv_sec == newnp->n_ctime) { 982 nfsstats.lookupcache_hits++; 983 if (cnp->cn_nameiop != LOOKUP && 984 (flags & ISLASTCN)) 985 cnp->cn_flags |= SAVENAME; 986 return (0); 987 } 988 cache_purge(newvp); 989 if (dvp != newvp) 990 vput(newvp); 991 else 992 vrele(newvp); 993 *vpp = NULLVP; 994 } else if (error == ENOENT) { 995 if (dvp->v_iflag & VI_DOOMED) 996 return (ENOENT); 997 /* 998 * We only accept a negative hit in the cache if the 999 * modification time of the parent directory matches 1000 * our cached copy. Otherwise, we discard all of the 1001 * negative cache entries for this directory. We also 1002 * only trust -ve cache entries for less than 1003 * nm_negative_namecache_timeout seconds. 1004 */ 1005 if ((u_int)(ticks - np->n_dmtime_ticks) < 1006 (nmp->nm_negnametimeo * hz) && 1007 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && 1008 vattr.va_mtime.tv_sec == np->n_dmtime) { 1009 nfsstats.lookupcache_hits++; 1010 return (ENOENT); 1011 } 1012 cache_purge_negative(dvp); 1013 mtx_lock(&np->n_mtx); 1014 np->n_dmtime = 0; 1015 mtx_unlock(&np->n_mtx); 1016 } 1017 1018 /* 1019 * Cache the modification time of the parent directory in case 1020 * the lookup fails and results in adding the first negative 1021 * name cache entry for the directory. Since this is reading 1022 * a single time_t, don't bother with locking. The 1023 * modification time may be a bit stale, but it must be read 1024 * before performing the lookup RPC to prevent a race where 1025 * another lookup updates the timestamp on the directory after 1026 * the lookup RPC has been performed on the server but before 1027 * n_dmtime is set at the end of this function. 1028 */ 1029 dmtime = np->n_vattr.va_mtime.tv_sec; 1030 error = 0; 1031 newvp = NULLVP; 1032 nfsstats.lookupcache_misses++; 1033 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 1034 len = cnp->cn_namelen; 1035 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 1036 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 1037 mb = mreq; 1038 bpos = mtod(mb, caddr_t); 1039 nfsm_fhtom(dvp, v3); 1040 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1041 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred); 1042 if (error) { 1043 if (v3) { 1044 nfsm_postop_attr(dvp, attrflag); 1045 m_freem(mrep); 1046 } 1047 goto nfsmout; 1048 } 1049 nfsm_getfh(fhp, fhsize, v3); 1050 1051 /* 1052 * Handle RENAME case... 1053 */ 1054 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 1055 if (NFS_CMPFH(np, fhp, fhsize)) { 1056 m_freem(mrep); 1057 return (EISDIR); 1058 } 1059 error = nfs_nget(mp, fhp, fhsize, &np, LK_EXCLUSIVE); 1060 if (error) { 1061 m_freem(mrep); 1062 return (error); 1063 } 1064 newvp = NFSTOV(np); 1065 if (v3) { 1066 nfsm_postop_attr(newvp, attrflag); 1067 nfsm_postop_attr(dvp, attrflag); 1068 } else 1069 nfsm_loadattr(newvp, NULL); 1070 *vpp = newvp; 1071 m_freem(mrep); 1072 cnp->cn_flags |= SAVENAME; 1073 return (0); 1074 } 1075 1076 if (flags & ISDOTDOT) { 1077 ltype = VOP_ISLOCKED(dvp); 1078 error = vfs_busy(mp, MBF_NOWAIT); 1079 if (error != 0) { 1080 vfs_ref(mp); 1081 VOP_UNLOCK(dvp, 0); 1082 error = vfs_busy(mp, 0); 1083 vn_lock(dvp, ltype | LK_RETRY); 1084 vfs_rel(mp); 1085 if (error == 0 && (dvp->v_iflag & VI_DOOMED)) { 1086 vfs_unbusy(mp); 1087 error = ENOENT; 1088 } 1089 if (error != 0) { 1090 m_freem(mrep); 1091 return (error); 1092 } 1093 } 1094 VOP_UNLOCK(dvp, 0); 1095 error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags); 1096 if (error == 0) 1097 newvp = NFSTOV(np); 1098 vfs_unbusy(mp); 1099 if (newvp != dvp) 1100 vn_lock(dvp, ltype | LK_RETRY); 1101 if (dvp->v_iflag & VI_DOOMED) { 1102 if (error == 0) { 1103 if (newvp == dvp) 1104 vrele(newvp); 1105 else 1106 vput(newvp); 1107 } 1108 error = ENOENT; 1109 } 1110 if (error) { 1111 m_freem(mrep); 1112 return (error); 1113 } 1114 } else if (NFS_CMPFH(np, fhp, fhsize)) { 1115 VREF(dvp); 1116 newvp = dvp; 1117 } else { 1118 error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags); 1119 if (error) { 1120 m_freem(mrep); 1121 return (error); 1122 } 1123 newvp = NFSTOV(np); 1124 } 1125 if (v3) { 1126 nfsm_postop_attr(newvp, attrflag); 1127 nfsm_postop_attr(dvp, attrflag); 1128 } else 1129 nfsm_loadattr(newvp, NULL); 1130 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1131 cnp->cn_flags |= SAVENAME; 1132 if ((cnp->cn_flags & MAKEENTRY) && 1133 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) { 1134 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 1135 cache_enter(dvp, newvp, cnp); 1136 } 1137 *vpp = newvp; 1138 m_freem(mrep); 1139 nfsmout: 1140 if (error) { 1141 if (newvp != NULLVP) { 1142 vput(newvp); 1143 *vpp = NULLVP; 1144 } 1145 1146 if (error != ENOENT) 1147 goto done; 1148 1149 /* The requested file was not found. */ 1150 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1151 (flags & ISLASTCN)) { 1152 /* 1153 * XXX: UFS does a full VOP_ACCESS(dvp, 1154 * VWRITE) here instead of just checking 1155 * MNT_RDONLY. 1156 */ 1157 if (mp->mnt_flag & MNT_RDONLY) 1158 return (EROFS); 1159 cnp->cn_flags |= SAVENAME; 1160 return (EJUSTRETURN); 1161 } 1162 1163 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) { 1164 /* 1165 * Maintain n_dmtime as the modification time 1166 * of the parent directory when the oldest -ve 1167 * name cache entry for this directory was 1168 * added. If a -ve cache entry has already 1169 * been added with a newer modification time 1170 * by a concurrent lookup, then don't bother 1171 * adding a cache entry. The modification 1172 * time of the directory might have changed 1173 * due to the file this lookup failed to find 1174 * being created. In that case a subsequent 1175 * lookup would incorrectly use the entry 1176 * added here instead of doing an extra 1177 * lookup. 1178 */ 1179 mtx_lock(&np->n_mtx); 1180 if (np->n_dmtime <= dmtime) { 1181 if (np->n_dmtime == 0) { 1182 np->n_dmtime = dmtime; 1183 np->n_dmtime_ticks = ticks; 1184 } 1185 mtx_unlock(&np->n_mtx); 1186 cache_enter(dvp, NULL, cnp); 1187 } else 1188 mtx_unlock(&np->n_mtx); 1189 } 1190 return (ENOENT); 1191 } 1192 done: 1193 return (error); 1194 } 1195 1196 /* 1197 * nfs read call. 1198 * Just call nfs_bioread() to do the work. 1199 */ 1200 static int 1201 nfs_read(struct vop_read_args *ap) 1202 { 1203 struct vnode *vp = ap->a_vp; 1204 1205 switch (vp->v_type) { 1206 case VREG: 1207 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1208 case VDIR: 1209 return (EISDIR); 1210 default: 1211 return (EOPNOTSUPP); 1212 } 1213 } 1214 1215 /* 1216 * nfs readlink call 1217 */ 1218 static int 1219 nfs_readlink(struct vop_readlink_args *ap) 1220 { 1221 struct vnode *vp = ap->a_vp; 1222 1223 if (vp->v_type != VLNK) 1224 return (EINVAL); 1225 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1226 } 1227 1228 /* 1229 * Do a readlink rpc. 1230 * Called by nfs_doio() from below the buffer cache. 1231 */ 1232 int 1233 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1234 { 1235 caddr_t bpos, dpos; 1236 int error = 0, len, attrflag; 1237 struct mbuf *mreq, *mrep, *md, *mb; 1238 int v3 = NFS_ISV3(vp); 1239 1240 nfsstats.rpccnt[NFSPROC_READLINK]++; 1241 mreq = nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 1242 mb = mreq; 1243 bpos = mtod(mb, caddr_t); 1244 nfsm_fhtom(vp, v3); 1245 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred); 1246 if (v3) 1247 nfsm_postop_attr(vp, attrflag); 1248 if (!error) { 1249 nfsm_strsiz(len, NFS_MAXPATHLEN); 1250 if (len == NFS_MAXPATHLEN) { 1251 struct nfsnode *np = VTONFS(vp); 1252 mtx_lock(&np->n_mtx); 1253 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1254 len = np->n_size; 1255 mtx_unlock(&np->n_mtx); 1256 } 1257 nfsm_mtouio(uiop, len); 1258 } 1259 m_freem(mrep); 1260 nfsmout: 1261 return (error); 1262 } 1263 1264 /* 1265 * nfs read rpc call 1266 * Ditto above 1267 */ 1268 int 1269 nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1270 { 1271 u_int32_t *tl; 1272 caddr_t bpos, dpos; 1273 struct mbuf *mreq, *mrep, *md, *mb; 1274 struct nfsmount *nmp; 1275 int error = 0, len, retlen, tsiz, eof, attrflag; 1276 int v3 = NFS_ISV3(vp); 1277 int rsize; 1278 1279 #ifndef nolint 1280 eof = 0; 1281 #endif 1282 nmp = VFSTONFS(vp->v_mount); 1283 tsiz = uiop->uio_resid; 1284 mtx_lock(&nmp->nm_mtx); 1285 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) { 1286 mtx_unlock(&nmp->nm_mtx); 1287 return (EFBIG); 1288 } 1289 rsize = nmp->nm_rsize; 1290 mtx_unlock(&nmp->nm_mtx); 1291 while (tsiz > 0) { 1292 nfsstats.rpccnt[NFSPROC_READ]++; 1293 len = (tsiz > rsize) ? rsize : tsiz; 1294 mreq = nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1295 mb = mreq; 1296 bpos = mtod(mb, caddr_t); 1297 nfsm_fhtom(vp, v3); 1298 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3); 1299 if (v3) { 1300 txdr_hyper(uiop->uio_offset, tl); 1301 *(tl + 2) = txdr_unsigned(len); 1302 } else { 1303 *tl++ = txdr_unsigned(uiop->uio_offset); 1304 *tl++ = txdr_unsigned(len); 1305 *tl = 0; 1306 } 1307 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred); 1308 if (v3) { 1309 nfsm_postop_attr(vp, attrflag); 1310 if (error) { 1311 m_freem(mrep); 1312 goto nfsmout; 1313 } 1314 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED); 1315 eof = fxdr_unsigned(int, *(tl + 1)); 1316 } else { 1317 nfsm_loadattr(vp, NULL); 1318 } 1319 nfsm_strsiz(retlen, rsize); 1320 nfsm_mtouio(uiop, retlen); 1321 m_freem(mrep); 1322 tsiz -= retlen; 1323 if (v3) { 1324 if (eof || retlen == 0) { 1325 tsiz = 0; 1326 } 1327 } else if (retlen < len) { 1328 tsiz = 0; 1329 } 1330 } 1331 nfsmout: 1332 return (error); 1333 } 1334 1335 /* 1336 * nfs write call 1337 */ 1338 int 1339 nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1340 int *iomode, int *must_commit) 1341 { 1342 u_int32_t *tl; 1343 int32_t backup; 1344 caddr_t bpos, dpos; 1345 struct mbuf *mreq, *mrep, *md, *mb; 1346 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1347 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1348 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1349 int wsize; 1350 1351 #ifndef DIAGNOSTIC 1352 if (uiop->uio_iovcnt != 1) 1353 panic("nfs: writerpc iovcnt > 1"); 1354 #endif 1355 *must_commit = 0; 1356 tsiz = uiop->uio_resid; 1357 mtx_lock(&nmp->nm_mtx); 1358 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) { 1359 mtx_unlock(&nmp->nm_mtx); 1360 return (EFBIG); 1361 } 1362 wsize = nmp->nm_wsize; 1363 mtx_unlock(&nmp->nm_mtx); 1364 while (tsiz > 0) { 1365 nfsstats.rpccnt[NFSPROC_WRITE]++; 1366 len = (tsiz > wsize) ? wsize : tsiz; 1367 mreq = nfsm_reqhead(vp, NFSPROC_WRITE, 1368 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1369 mb = mreq; 1370 bpos = mtod(mb, caddr_t); 1371 nfsm_fhtom(vp, v3); 1372 if (v3) { 1373 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 1374 txdr_hyper(uiop->uio_offset, tl); 1375 tl += 2; 1376 *tl++ = txdr_unsigned(len); 1377 *tl++ = txdr_unsigned(*iomode); 1378 *tl = txdr_unsigned(len); 1379 } else { 1380 u_int32_t x; 1381 1382 tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED); 1383 /* Set both "begin" and "current" to non-garbage. */ 1384 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1385 *tl++ = x; /* "begin offset" */ 1386 *tl++ = x; /* "current offset" */ 1387 x = txdr_unsigned(len); 1388 *tl++ = x; /* total to this offset */ 1389 *tl = x; /* size of this write */ 1390 } 1391 nfsm_uiotom(uiop, len); 1392 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred); 1393 if (v3) { 1394 wccflag = NFSV3_WCCCHK; 1395 nfsm_wcc_data(vp, wccflag); 1396 if (!error) { 1397 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED 1398 + NFSX_V3WRITEVERF); 1399 rlen = fxdr_unsigned(int, *tl++); 1400 if (rlen == 0) { 1401 error = NFSERR_IO; 1402 m_freem(mrep); 1403 break; 1404 } else if (rlen < len) { 1405 backup = len - rlen; 1406 uiop->uio_iov->iov_base = 1407 (char *)uiop->uio_iov->iov_base - 1408 backup; 1409 uiop->uio_iov->iov_len += backup; 1410 uiop->uio_offset -= backup; 1411 uiop->uio_resid += backup; 1412 len = rlen; 1413 } 1414 commit = fxdr_unsigned(int, *tl++); 1415 1416 /* 1417 * Return the lowest committment level 1418 * obtained by any of the RPCs. 1419 */ 1420 if (committed == NFSV3WRITE_FILESYNC) 1421 committed = commit; 1422 else if (committed == NFSV3WRITE_DATASYNC && 1423 commit == NFSV3WRITE_UNSTABLE) 1424 committed = commit; 1425 mtx_lock(&nmp->nm_mtx); 1426 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1427 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1428 NFSX_V3WRITEVERF); 1429 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1430 } else if (bcmp((caddr_t)tl, 1431 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1432 *must_commit = 1; 1433 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1434 NFSX_V3WRITEVERF); 1435 } 1436 mtx_unlock(&nmp->nm_mtx); 1437 } 1438 } else { 1439 nfsm_loadattr(vp, NULL); 1440 } 1441 if (wccflag) { 1442 mtx_lock(&(VTONFS(vp))->n_mtx); 1443 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime; 1444 mtx_unlock(&(VTONFS(vp))->n_mtx); 1445 } 1446 m_freem(mrep); 1447 if (error) 1448 break; 1449 tsiz -= len; 1450 } 1451 nfsmout: 1452 if (vp->v_mount->mnt_kern_flag & MNTK_ASYNC) 1453 committed = NFSV3WRITE_FILESYNC; 1454 *iomode = committed; 1455 if (error) 1456 uiop->uio_resid = tsiz; 1457 return (error); 1458 } 1459 1460 /* 1461 * nfs mknod rpc 1462 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1463 * mode set to specify the file type and the size field for rdev. 1464 */ 1465 static int 1466 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1467 struct vattr *vap) 1468 { 1469 struct nfsv2_sattr *sp; 1470 u_int32_t *tl; 1471 struct vnode *newvp = NULL; 1472 struct nfsnode *np = NULL; 1473 struct vattr vattr; 1474 caddr_t bpos, dpos; 1475 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1476 struct mbuf *mreq, *mrep, *md, *mb; 1477 u_int32_t rdev; 1478 int v3 = NFS_ISV3(dvp); 1479 1480 if (vap->va_type == VCHR || vap->va_type == VBLK) 1481 rdev = txdr_unsigned(vap->va_rdev); 1482 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1483 rdev = nfs_xdrneg1; 1484 else { 1485 return (EOPNOTSUPP); 1486 } 1487 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 1488 return (error); 1489 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1490 mreq = nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1491 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1492 mb = mreq; 1493 bpos = mtod(mb, caddr_t); 1494 nfsm_fhtom(dvp, v3); 1495 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1496 if (v3) { 1497 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1498 *tl++ = vtonfsv3_type(vap->va_type); 1499 nfsm_v3attrbuild(vap, FALSE); 1500 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1501 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 1502 *tl++ = txdr_unsigned(major(vap->va_rdev)); 1503 *tl = txdr_unsigned(minor(vap->va_rdev)); 1504 } 1505 } else { 1506 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1507 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1508 sp->sa_uid = nfs_xdrneg1; 1509 sp->sa_gid = nfs_xdrneg1; 1510 sp->sa_size = rdev; 1511 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1512 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1513 } 1514 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred); 1515 if (!error) { 1516 nfsm_mtofh(dvp, newvp, v3, gotvp); 1517 if (!gotvp) { 1518 if (newvp) { 1519 vput(newvp); 1520 newvp = NULL; 1521 } 1522 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1523 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1524 if (!error) 1525 newvp = NFSTOV(np); 1526 } 1527 } 1528 if (v3) 1529 nfsm_wcc_data(dvp, wccflag); 1530 m_freem(mrep); 1531 nfsmout: 1532 if (error) { 1533 if (newvp) 1534 vput(newvp); 1535 } else { 1536 if (cnp->cn_flags & MAKEENTRY) 1537 cache_enter(dvp, newvp, cnp); 1538 *vpp = newvp; 1539 } 1540 mtx_lock(&(VTONFS(dvp))->n_mtx); 1541 VTONFS(dvp)->n_flag |= NMODIFIED; 1542 if (!wccflag) { 1543 VTONFS(dvp)->n_attrstamp = 0; 1544 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1545 } 1546 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1547 return (error); 1548 } 1549 1550 /* 1551 * nfs mknod vop 1552 * just call nfs_mknodrpc() to do the work. 1553 */ 1554 /* ARGSUSED */ 1555 static int 1556 nfs_mknod(struct vop_mknod_args *ap) 1557 { 1558 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1559 } 1560 1561 static u_long create_verf; 1562 /* 1563 * nfs file create call 1564 */ 1565 static int 1566 nfs_create(struct vop_create_args *ap) 1567 { 1568 struct vnode *dvp = ap->a_dvp; 1569 struct vattr *vap = ap->a_vap; 1570 struct componentname *cnp = ap->a_cnp; 1571 struct nfsv2_sattr *sp; 1572 u_int32_t *tl; 1573 struct nfsnode *np = NULL; 1574 struct vnode *newvp = NULL; 1575 caddr_t bpos, dpos; 1576 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1577 struct mbuf *mreq, *mrep, *md, *mb; 1578 struct vattr vattr; 1579 int v3 = NFS_ISV3(dvp); 1580 1581 /* 1582 * Oops, not for me.. 1583 */ 1584 if (vap->va_type == VSOCK) { 1585 error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap); 1586 return (error); 1587 } 1588 1589 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) { 1590 return (error); 1591 } 1592 if (vap->va_vaflags & VA_EXCLUSIVE) 1593 fmode |= O_EXCL; 1594 again: 1595 nfsstats.rpccnt[NFSPROC_CREATE]++; 1596 mreq = nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1597 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1598 mb = mreq; 1599 bpos = mtod(mb, caddr_t); 1600 nfsm_fhtom(dvp, v3); 1601 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1602 if (v3) { 1603 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1604 if (fmode & O_EXCL) { 1605 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1606 tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF); 1607 #ifdef INET 1608 CURVNET_SET(CRED_TO_VNET(cnp->cn_cred)); 1609 IN_IFADDR_RLOCK(); 1610 if (!TAILQ_EMPTY(&V_in_ifaddrhead)) 1611 *tl++ = IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr.s_addr; 1612 else 1613 #endif 1614 *tl++ = create_verf; 1615 #ifdef INET 1616 IN_IFADDR_RUNLOCK(); 1617 CURVNET_RESTORE(); 1618 #endif 1619 *tl = ++create_verf; 1620 } else { 1621 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1622 nfsm_v3attrbuild(vap, FALSE); 1623 } 1624 } else { 1625 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1626 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1627 sp->sa_uid = nfs_xdrneg1; 1628 sp->sa_gid = nfs_xdrneg1; 1629 sp->sa_size = 0; 1630 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1631 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1632 } 1633 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred); 1634 if (!error) { 1635 nfsm_mtofh(dvp, newvp, v3, gotvp); 1636 if (!gotvp) { 1637 if (newvp) { 1638 vput(newvp); 1639 newvp = NULL; 1640 } 1641 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1642 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1643 if (!error) 1644 newvp = NFSTOV(np); 1645 } 1646 } 1647 if (v3) 1648 nfsm_wcc_data(dvp, wccflag); 1649 m_freem(mrep); 1650 nfsmout: 1651 if (error) { 1652 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1653 fmode &= ~O_EXCL; 1654 goto again; 1655 } 1656 if (newvp) 1657 vput(newvp); 1658 } else if (v3 && (fmode & O_EXCL)) { 1659 /* 1660 * We are normally called with only a partially initialized 1661 * VAP. Since the NFSv3 spec says that server may use the 1662 * file attributes to store the verifier, the spec requires 1663 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1664 * in atime, but we can't really assume that all servers will 1665 * so we ensure that our SETATTR sets both atime and mtime. 1666 */ 1667 if (vap->va_mtime.tv_sec == VNOVAL) 1668 vfs_timestamp(&vap->va_mtime); 1669 if (vap->va_atime.tv_sec == VNOVAL) 1670 vap->va_atime = vap->va_mtime; 1671 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred); 1672 if (error) 1673 vput(newvp); 1674 } 1675 if (!error) { 1676 if (cnp->cn_flags & MAKEENTRY) 1677 cache_enter(dvp, newvp, cnp); 1678 *ap->a_vpp = newvp; 1679 } 1680 mtx_lock(&(VTONFS(dvp))->n_mtx); 1681 VTONFS(dvp)->n_flag |= NMODIFIED; 1682 if (!wccflag) { 1683 VTONFS(dvp)->n_attrstamp = 0; 1684 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1685 } 1686 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1687 return (error); 1688 } 1689 1690 /* 1691 * nfs file remove call 1692 * To try and make nfs semantics closer to ufs semantics, a file that has 1693 * other processes using the vnode is renamed instead of removed and then 1694 * removed later on the last close. 1695 * - If v_usecount > 1 1696 * If a rename is not already in the works 1697 * call nfs_sillyrename() to set it up 1698 * else 1699 * do the remove rpc 1700 */ 1701 static int 1702 nfs_remove(struct vop_remove_args *ap) 1703 { 1704 struct vnode *vp = ap->a_vp; 1705 struct vnode *dvp = ap->a_dvp; 1706 struct componentname *cnp = ap->a_cnp; 1707 struct nfsnode *np = VTONFS(vp); 1708 int error = 0; 1709 struct vattr vattr; 1710 1711 #ifndef DIAGNOSTIC 1712 if ((cnp->cn_flags & HASBUF) == 0) 1713 panic("nfs_remove: no name"); 1714 if (vrefcnt(vp) < 1) 1715 panic("nfs_remove: bad v_usecount"); 1716 #endif 1717 if (vp->v_type == VDIR) 1718 error = EPERM; 1719 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1720 !VOP_GETATTR(vp, &vattr, cnp->cn_cred) && vattr.va_nlink > 1)) { 1721 /* 1722 * Purge the name cache so that the chance of a lookup for 1723 * the name succeeding while the remove is in progress is 1724 * minimized. Without node locking it can still happen, such 1725 * that an I/O op returns ESTALE, but since you get this if 1726 * another host removes the file.. 1727 */ 1728 cache_purge(vp); 1729 /* 1730 * throw away biocache buffers, mainly to avoid 1731 * unnecessary delayed writes later. 1732 */ 1733 error = nfs_vinvalbuf(vp, 0, cnp->cn_thread, 1); 1734 /* Do the rpc */ 1735 if (error != EINTR && error != EIO) 1736 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1737 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1738 /* 1739 * Kludge City: If the first reply to the remove rpc is lost.. 1740 * the reply to the retransmitted request will be ENOENT 1741 * since the file was in fact removed 1742 * Therefore, we cheat and return success. 1743 */ 1744 if (error == ENOENT) 1745 error = 0; 1746 } else if (!np->n_sillyrename) 1747 error = nfs_sillyrename(dvp, vp, cnp); 1748 np->n_attrstamp = 0; 1749 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1750 return (error); 1751 } 1752 1753 /* 1754 * nfs file remove rpc called from nfs_inactive 1755 */ 1756 int 1757 nfs_removeit(struct sillyrename *sp) 1758 { 1759 /* 1760 * Make sure that the directory vnode is still valid. 1761 * XXX we should lock sp->s_dvp here. 1762 */ 1763 if (sp->s_dvp->v_type == VBAD) 1764 return (0); 1765 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1766 NULL)); 1767 } 1768 1769 /* 1770 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1771 */ 1772 static int 1773 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1774 struct ucred *cred, struct thread *td) 1775 { 1776 caddr_t bpos, dpos; 1777 int error = 0, wccflag = NFSV3_WCCRATTR; 1778 struct mbuf *mreq, *mrep, *md, *mb; 1779 int v3 = NFS_ISV3(dvp); 1780 1781 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1782 mreq = nfsm_reqhead(dvp, NFSPROC_REMOVE, 1783 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1784 mb = mreq; 1785 bpos = mtod(mb, caddr_t); 1786 nfsm_fhtom(dvp, v3); 1787 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1788 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1789 if (v3) 1790 nfsm_wcc_data(dvp, wccflag); 1791 m_freem(mrep); 1792 nfsmout: 1793 mtx_lock(&(VTONFS(dvp))->n_mtx); 1794 VTONFS(dvp)->n_flag |= NMODIFIED; 1795 if (!wccflag) { 1796 VTONFS(dvp)->n_attrstamp = 0; 1797 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1798 } 1799 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1800 return (error); 1801 } 1802 1803 /* 1804 * nfs file rename call 1805 */ 1806 static int 1807 nfs_rename(struct vop_rename_args *ap) 1808 { 1809 struct vnode *fvp = ap->a_fvp; 1810 struct vnode *tvp = ap->a_tvp; 1811 struct vnode *fdvp = ap->a_fdvp; 1812 struct vnode *tdvp = ap->a_tdvp; 1813 struct componentname *tcnp = ap->a_tcnp; 1814 struct componentname *fcnp = ap->a_fcnp; 1815 int error; 1816 1817 #ifndef DIAGNOSTIC 1818 if ((tcnp->cn_flags & HASBUF) == 0 || 1819 (fcnp->cn_flags & HASBUF) == 0) 1820 panic("nfs_rename: no name"); 1821 #endif 1822 /* Check for cross-device rename */ 1823 if ((fvp->v_mount != tdvp->v_mount) || 1824 (tvp && (fvp->v_mount != tvp->v_mount))) { 1825 error = EXDEV; 1826 goto out; 1827 } 1828 1829 if (fvp == tvp) { 1830 nfs_printf("nfs_rename: fvp == tvp (can't happen)\n"); 1831 error = 0; 1832 goto out; 1833 } 1834 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 1835 goto out; 1836 1837 /* 1838 * We have to flush B_DELWRI data prior to renaming 1839 * the file. If we don't, the delayed-write buffers 1840 * can be flushed out later after the file has gone stale 1841 * under NFSV3. NFSV2 does not have this problem because 1842 * ( as far as I can tell ) it flushes dirty buffers more 1843 * often. 1844 * 1845 * Skip the rename operation if the fsync fails, this can happen 1846 * due to the server's volume being full, when we pushed out data 1847 * that was written back to our cache earlier. Not checking for 1848 * this condition can result in potential (silent) data loss. 1849 */ 1850 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread); 1851 VOP_UNLOCK(fvp, 0); 1852 if (!error && tvp) 1853 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread); 1854 if (error) 1855 goto out; 1856 1857 /* 1858 * If the tvp exists and is in use, sillyrename it before doing the 1859 * rename of the new file over it. 1860 * XXX Can't sillyrename a directory. 1861 */ 1862 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1863 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1864 vput(tvp); 1865 tvp = NULL; 1866 } 1867 1868 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1869 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1870 tcnp->cn_thread); 1871 1872 if (fvp->v_type == VDIR) { 1873 if (tvp != NULL && tvp->v_type == VDIR) 1874 cache_purge(tdvp); 1875 cache_purge(fdvp); 1876 } 1877 1878 out: 1879 if (tdvp == tvp) 1880 vrele(tdvp); 1881 else 1882 vput(tdvp); 1883 if (tvp) 1884 vput(tvp); 1885 vrele(fdvp); 1886 vrele(fvp); 1887 /* 1888 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1889 */ 1890 if (error == ENOENT) 1891 error = 0; 1892 return (error); 1893 } 1894 1895 /* 1896 * nfs file rename rpc called from nfs_remove() above 1897 */ 1898 static int 1899 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 1900 struct sillyrename *sp) 1901 { 1902 1903 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp, 1904 sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread)); 1905 } 1906 1907 /* 1908 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1909 */ 1910 static int 1911 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 1912 struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred, 1913 struct thread *td) 1914 { 1915 caddr_t bpos, dpos; 1916 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1917 struct mbuf *mreq, *mrep, *md, *mb; 1918 int v3 = NFS_ISV3(fdvp); 1919 1920 nfsstats.rpccnt[NFSPROC_RENAME]++; 1921 mreq = nfsm_reqhead(fdvp, NFSPROC_RENAME, 1922 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1923 nfsm_rndup(tnamelen)); 1924 mb = mreq; 1925 bpos = mtod(mb, caddr_t); 1926 nfsm_fhtom(fdvp, v3); 1927 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1928 nfsm_fhtom(tdvp, v3); 1929 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1930 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1931 if (v3) { 1932 nfsm_wcc_data(fdvp, fwccflag); 1933 nfsm_wcc_data(tdvp, twccflag); 1934 } 1935 m_freem(mrep); 1936 nfsmout: 1937 mtx_lock(&(VTONFS(fdvp))->n_mtx); 1938 VTONFS(fdvp)->n_flag |= NMODIFIED; 1939 mtx_unlock(&(VTONFS(fdvp))->n_mtx); 1940 mtx_lock(&(VTONFS(tdvp))->n_mtx); 1941 VTONFS(tdvp)->n_flag |= NMODIFIED; 1942 mtx_unlock(&(VTONFS(tdvp))->n_mtx); 1943 if (!fwccflag) { 1944 VTONFS(fdvp)->n_attrstamp = 0; 1945 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 1946 } 1947 if (!twccflag) { 1948 VTONFS(tdvp)->n_attrstamp = 0; 1949 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 1950 } 1951 return (error); 1952 } 1953 1954 /* 1955 * nfs hard link create call 1956 */ 1957 static int 1958 nfs_link(struct vop_link_args *ap) 1959 { 1960 struct vnode *vp = ap->a_vp; 1961 struct vnode *tdvp = ap->a_tdvp; 1962 struct componentname *cnp = ap->a_cnp; 1963 caddr_t bpos, dpos; 1964 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1965 struct mbuf *mreq, *mrep, *md, *mb; 1966 int v3; 1967 1968 if (vp->v_mount != tdvp->v_mount) { 1969 return (EXDEV); 1970 } 1971 1972 /* 1973 * Push all writes to the server, so that the attribute cache 1974 * doesn't get "out of sync" with the server. 1975 * XXX There should be a better way! 1976 */ 1977 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread); 1978 1979 v3 = NFS_ISV3(vp); 1980 nfsstats.rpccnt[NFSPROC_LINK]++; 1981 mreq = nfsm_reqhead(vp, NFSPROC_LINK, 1982 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1983 mb = mreq; 1984 bpos = mtod(mb, caddr_t); 1985 nfsm_fhtom(vp, v3); 1986 nfsm_fhtom(tdvp, v3); 1987 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1988 nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred); 1989 if (v3) { 1990 nfsm_postop_attr(vp, attrflag); 1991 nfsm_wcc_data(tdvp, wccflag); 1992 } 1993 m_freem(mrep); 1994 nfsmout: 1995 mtx_lock(&(VTONFS(tdvp))->n_mtx); 1996 VTONFS(tdvp)->n_flag |= NMODIFIED; 1997 mtx_unlock(&(VTONFS(tdvp))->n_mtx); 1998 if (!attrflag) { 1999 VTONFS(vp)->n_attrstamp = 0; 2000 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 2001 } 2002 if (!wccflag) { 2003 VTONFS(tdvp)->n_attrstamp = 0; 2004 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 2005 } 2006 return (error); 2007 } 2008 2009 /* 2010 * nfs symbolic link create call 2011 */ 2012 static int 2013 nfs_symlink(struct vop_symlink_args *ap) 2014 { 2015 struct vnode *dvp = ap->a_dvp; 2016 struct vattr *vap = ap->a_vap; 2017 struct componentname *cnp = ap->a_cnp; 2018 struct nfsv2_sattr *sp; 2019 caddr_t bpos, dpos; 2020 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 2021 struct mbuf *mreq, *mrep, *md, *mb; 2022 struct vnode *newvp = NULL; 2023 int v3 = NFS_ISV3(dvp); 2024 2025 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 2026 slen = strlen(ap->a_target); 2027 mreq = nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 2028 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 2029 mb = mreq; 2030 bpos = mtod(mb, caddr_t); 2031 nfsm_fhtom(dvp, v3); 2032 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2033 if (v3) { 2034 nfsm_v3attrbuild(vap, FALSE); 2035 } 2036 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 2037 if (!v3) { 2038 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 2039 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 2040 sp->sa_uid = nfs_xdrneg1; 2041 sp->sa_gid = nfs_xdrneg1; 2042 sp->sa_size = nfs_xdrneg1; 2043 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2044 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2045 } 2046 2047 /* 2048 * Issue the NFS request and get the rpc response. 2049 * 2050 * Only NFSv3 responses returning an error of 0 actually return 2051 * a file handle that can be converted into newvp without having 2052 * to do an extra lookup rpc. 2053 */ 2054 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred); 2055 if (v3) { 2056 if (error == 0) 2057 nfsm_mtofh(dvp, newvp, v3, gotvp); 2058 nfsm_wcc_data(dvp, wccflag); 2059 } 2060 2061 /* 2062 * out code jumps -> here, mrep is also freed. 2063 */ 2064 2065 m_freem(mrep); 2066 nfsmout: 2067 2068 /* 2069 * If we do not have an error and we could not extract the newvp from 2070 * the response due to the request being NFSv2, we have to do a 2071 * lookup in order to obtain a newvp to return. 2072 */ 2073 if (error == 0 && newvp == NULL) { 2074 struct nfsnode *np = NULL; 2075 2076 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2077 cnp->cn_cred, cnp->cn_thread, &np); 2078 if (!error) 2079 newvp = NFSTOV(np); 2080 } 2081 if (error) { 2082 if (newvp) 2083 vput(newvp); 2084 } else { 2085 *ap->a_vpp = newvp; 2086 } 2087 mtx_lock(&(VTONFS(dvp))->n_mtx); 2088 VTONFS(dvp)->n_flag |= NMODIFIED; 2089 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2090 if (!wccflag) { 2091 VTONFS(dvp)->n_attrstamp = 0; 2092 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2093 } 2094 return (error); 2095 } 2096 2097 /* 2098 * nfs make dir call 2099 */ 2100 static int 2101 nfs_mkdir(struct vop_mkdir_args *ap) 2102 { 2103 struct vnode *dvp = ap->a_dvp; 2104 struct vattr *vap = ap->a_vap; 2105 struct componentname *cnp = ap->a_cnp; 2106 struct nfsv2_sattr *sp; 2107 int len; 2108 struct nfsnode *np = NULL; 2109 struct vnode *newvp = NULL; 2110 caddr_t bpos, dpos; 2111 int error = 0, wccflag = NFSV3_WCCRATTR; 2112 int gotvp = 0; 2113 struct mbuf *mreq, *mrep, *md, *mb; 2114 struct vattr vattr; 2115 int v3 = NFS_ISV3(dvp); 2116 2117 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2118 return (error); 2119 len = cnp->cn_namelen; 2120 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2121 mreq = nfsm_reqhead(dvp, NFSPROC_MKDIR, 2122 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 2123 mb = mreq; 2124 bpos = mtod(mb, caddr_t); 2125 nfsm_fhtom(dvp, v3); 2126 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 2127 if (v3) { 2128 nfsm_v3attrbuild(vap, FALSE); 2129 } else { 2130 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 2131 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2132 sp->sa_uid = nfs_xdrneg1; 2133 sp->sa_gid = nfs_xdrneg1; 2134 sp->sa_size = nfs_xdrneg1; 2135 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2136 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2137 } 2138 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred); 2139 if (!error) 2140 nfsm_mtofh(dvp, newvp, v3, gotvp); 2141 if (v3) 2142 nfsm_wcc_data(dvp, wccflag); 2143 m_freem(mrep); 2144 nfsmout: 2145 mtx_lock(&(VTONFS(dvp))->n_mtx); 2146 VTONFS(dvp)->n_flag |= NMODIFIED; 2147 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2148 if (!wccflag) { 2149 VTONFS(dvp)->n_attrstamp = 0; 2150 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2151 } 2152 if (error == 0 && newvp == NULL) { 2153 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2154 cnp->cn_thread, &np); 2155 if (!error) { 2156 newvp = NFSTOV(np); 2157 if (newvp->v_type != VDIR) 2158 error = EEXIST; 2159 } 2160 } 2161 if (error) { 2162 if (newvp) 2163 vput(newvp); 2164 } else 2165 *ap->a_vpp = newvp; 2166 return (error); 2167 } 2168 2169 /* 2170 * nfs remove directory call 2171 */ 2172 static int 2173 nfs_rmdir(struct vop_rmdir_args *ap) 2174 { 2175 struct vnode *vp = ap->a_vp; 2176 struct vnode *dvp = ap->a_dvp; 2177 struct componentname *cnp = ap->a_cnp; 2178 caddr_t bpos, dpos; 2179 int error = 0, wccflag = NFSV3_WCCRATTR; 2180 struct mbuf *mreq, *mrep, *md, *mb; 2181 int v3 = NFS_ISV3(dvp); 2182 2183 if (dvp == vp) 2184 return (EINVAL); 2185 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2186 mreq = nfsm_reqhead(dvp, NFSPROC_RMDIR, 2187 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2188 mb = mreq; 2189 bpos = mtod(mb, caddr_t); 2190 nfsm_fhtom(dvp, v3); 2191 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2192 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred); 2193 if (v3) 2194 nfsm_wcc_data(dvp, wccflag); 2195 m_freem(mrep); 2196 nfsmout: 2197 mtx_lock(&(VTONFS(dvp))->n_mtx); 2198 VTONFS(dvp)->n_flag |= NMODIFIED; 2199 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2200 if (!wccflag) { 2201 VTONFS(dvp)->n_attrstamp = 0; 2202 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2203 } 2204 cache_purge(dvp); 2205 cache_purge(vp); 2206 /* 2207 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2208 */ 2209 if (error == ENOENT) 2210 error = 0; 2211 return (error); 2212 } 2213 2214 /* 2215 * nfs readdir call 2216 */ 2217 static int 2218 nfs_readdir(struct vop_readdir_args *ap) 2219 { 2220 struct vnode *vp = ap->a_vp; 2221 struct nfsnode *np = VTONFS(vp); 2222 struct uio *uio = ap->a_uio; 2223 int tresid, error = 0; 2224 struct vattr vattr; 2225 2226 if (vp->v_type != VDIR) 2227 return(EPERM); 2228 2229 /* 2230 * First, check for hit on the EOF offset cache 2231 */ 2232 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2233 (np->n_flag & NMODIFIED) == 0) { 2234 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2235 mtx_lock(&np->n_mtx); 2236 if (!NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2237 mtx_unlock(&np->n_mtx); 2238 nfsstats.direofcache_hits++; 2239 goto out; 2240 } else 2241 mtx_unlock(&np->n_mtx); 2242 } 2243 } 2244 2245 /* 2246 * Call nfs_bioread() to do the real work. 2247 */ 2248 tresid = uio->uio_resid; 2249 error = nfs_bioread(vp, uio, 0, ap->a_cred); 2250 2251 if (!error && uio->uio_resid == tresid) { 2252 nfsstats.direofcache_misses++; 2253 } 2254 out: 2255 return (error); 2256 } 2257 2258 /* 2259 * Readdir rpc call. 2260 * Called from below the buffer cache by nfs_doio(). 2261 */ 2262 int 2263 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2264 { 2265 int len, left; 2266 struct dirent *dp = NULL; 2267 u_int32_t *tl; 2268 caddr_t cp; 2269 nfsuint64 *cookiep; 2270 caddr_t bpos, dpos; 2271 struct mbuf *mreq, *mrep, *md, *mb; 2272 nfsuint64 cookie; 2273 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2274 struct nfsnode *dnp = VTONFS(vp); 2275 u_quad_t fileno; 2276 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2277 int attrflag; 2278 int v3 = NFS_ISV3(vp); 2279 2280 #ifndef DIAGNOSTIC 2281 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2282 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2283 panic("nfs readdirrpc bad uio"); 2284 #endif 2285 2286 /* 2287 * If there is no cookie, assume directory was stale. 2288 */ 2289 nfs_dircookie_lock(dnp); 2290 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2291 if (cookiep) { 2292 cookie = *cookiep; 2293 nfs_dircookie_unlock(dnp); 2294 } else { 2295 nfs_dircookie_unlock(dnp); 2296 return (NFSERR_BAD_COOKIE); 2297 } 2298 2299 /* 2300 * Loop around doing readdir rpc's of size nm_readdirsize 2301 * truncated to a multiple of DIRBLKSIZ. 2302 * The stopping criteria is EOF or buffer full. 2303 */ 2304 while (more_dirs && bigenough) { 2305 nfsstats.rpccnt[NFSPROC_READDIR]++; 2306 mreq = nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 2307 NFSX_READDIR(v3)); 2308 mb = mreq; 2309 bpos = mtod(mb, caddr_t); 2310 nfsm_fhtom(vp, v3); 2311 if (v3) { 2312 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 2313 *tl++ = cookie.nfsuquad[0]; 2314 *tl++ = cookie.nfsuquad[1]; 2315 mtx_lock(&dnp->n_mtx); 2316 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2317 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2318 mtx_unlock(&dnp->n_mtx); 2319 } else { 2320 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 2321 *tl++ = cookie.nfsuquad[0]; 2322 } 2323 *tl = txdr_unsigned(nmp->nm_readdirsize); 2324 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred); 2325 if (v3) { 2326 nfsm_postop_attr(vp, attrflag); 2327 if (!error) { 2328 tl = nfsm_dissect(u_int32_t *, 2329 2 * NFSX_UNSIGNED); 2330 mtx_lock(&dnp->n_mtx); 2331 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2332 dnp->n_cookieverf.nfsuquad[1] = *tl; 2333 mtx_unlock(&dnp->n_mtx); 2334 } else { 2335 m_freem(mrep); 2336 goto nfsmout; 2337 } 2338 } 2339 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2340 more_dirs = fxdr_unsigned(int, *tl); 2341 2342 /* loop thru the dir entries, doctoring them to 4bsd form */ 2343 while (more_dirs && bigenough) { 2344 if (v3) { 2345 tl = nfsm_dissect(u_int32_t *, 2346 3 * NFSX_UNSIGNED); 2347 fileno = fxdr_hyper(tl); 2348 len = fxdr_unsigned(int, *(tl + 2)); 2349 } else { 2350 tl = nfsm_dissect(u_int32_t *, 2351 2 * NFSX_UNSIGNED); 2352 fileno = fxdr_unsigned(u_quad_t, *tl++); 2353 len = fxdr_unsigned(int, *tl); 2354 } 2355 if (len <= 0 || len > NFS_MAXNAMLEN) { 2356 error = EBADRPC; 2357 m_freem(mrep); 2358 goto nfsmout; 2359 } 2360 tlen = nfsm_rndup(len); 2361 if (tlen == len) 2362 tlen += 4; /* To ensure null termination */ 2363 left = DIRBLKSIZ - blksiz; 2364 if ((tlen + DIRHDSIZ) > left) { 2365 dp->d_reclen += left; 2366 uiop->uio_iov->iov_base = 2367 (char *)uiop->uio_iov->iov_base + left; 2368 uiop->uio_iov->iov_len -= left; 2369 uiop->uio_offset += left; 2370 uiop->uio_resid -= left; 2371 blksiz = 0; 2372 } 2373 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2374 bigenough = 0; 2375 if (bigenough) { 2376 dp = (struct dirent *)uiop->uio_iov->iov_base; 2377 dp->d_fileno = (int)fileno; 2378 dp->d_namlen = len; 2379 dp->d_reclen = tlen + DIRHDSIZ; 2380 dp->d_type = DT_UNKNOWN; 2381 blksiz += dp->d_reclen; 2382 if (blksiz == DIRBLKSIZ) 2383 blksiz = 0; 2384 uiop->uio_offset += DIRHDSIZ; 2385 uiop->uio_resid -= DIRHDSIZ; 2386 uiop->uio_iov->iov_base = 2387 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2388 uiop->uio_iov->iov_len -= DIRHDSIZ; 2389 nfsm_mtouio(uiop, len); 2390 cp = uiop->uio_iov->iov_base; 2391 tlen -= len; 2392 *cp = '\0'; /* null terminate */ 2393 uiop->uio_iov->iov_base = 2394 (char *)uiop->uio_iov->iov_base + tlen; 2395 uiop->uio_iov->iov_len -= tlen; 2396 uiop->uio_offset += tlen; 2397 uiop->uio_resid -= tlen; 2398 } else 2399 nfsm_adv(nfsm_rndup(len)); 2400 if (v3) { 2401 tl = nfsm_dissect(u_int32_t *, 2402 3 * NFSX_UNSIGNED); 2403 } else { 2404 tl = nfsm_dissect(u_int32_t *, 2405 2 * NFSX_UNSIGNED); 2406 } 2407 if (bigenough) { 2408 cookie.nfsuquad[0] = *tl++; 2409 if (v3) 2410 cookie.nfsuquad[1] = *tl++; 2411 } else if (v3) 2412 tl += 2; 2413 else 2414 tl++; 2415 more_dirs = fxdr_unsigned(int, *tl); 2416 } 2417 /* 2418 * If at end of rpc data, get the eof boolean 2419 */ 2420 if (!more_dirs) { 2421 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2422 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2423 } 2424 m_freem(mrep); 2425 } 2426 /* 2427 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2428 * by increasing d_reclen for the last record. 2429 */ 2430 if (blksiz > 0) { 2431 left = DIRBLKSIZ - blksiz; 2432 dp->d_reclen += left; 2433 uiop->uio_iov->iov_base = 2434 (char *)uiop->uio_iov->iov_base + left; 2435 uiop->uio_iov->iov_len -= left; 2436 uiop->uio_offset += left; 2437 uiop->uio_resid -= left; 2438 } 2439 2440 /* 2441 * We are now either at the end of the directory or have filled the 2442 * block. 2443 */ 2444 if (bigenough) 2445 dnp->n_direofoffset = uiop->uio_offset; 2446 else { 2447 if (uiop->uio_resid > 0) 2448 nfs_printf("EEK! readdirrpc resid > 0\n"); 2449 nfs_dircookie_lock(dnp); 2450 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2451 *cookiep = cookie; 2452 nfs_dircookie_unlock(dnp); 2453 } 2454 nfsmout: 2455 return (error); 2456 } 2457 2458 /* 2459 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2460 */ 2461 int 2462 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2463 { 2464 int len, left; 2465 struct dirent *dp; 2466 u_int32_t *tl; 2467 caddr_t cp; 2468 struct vnode *newvp; 2469 nfsuint64 *cookiep; 2470 caddr_t bpos, dpos, dpossav1, dpossav2; 2471 struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2; 2472 struct nameidata nami, *ndp = &nami; 2473 struct componentname *cnp = &ndp->ni_cnd; 2474 nfsuint64 cookie; 2475 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2476 struct nfsnode *dnp = VTONFS(vp), *np; 2477 nfsfh_t *fhp; 2478 u_quad_t fileno; 2479 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2480 int attrflag, fhsize; 2481 2482 #ifndef nolint 2483 dp = NULL; 2484 #endif 2485 #ifndef DIAGNOSTIC 2486 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2487 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2488 panic("nfs readdirplusrpc bad uio"); 2489 #endif 2490 ndp->ni_dvp = vp; 2491 newvp = NULLVP; 2492 2493 /* 2494 * If there is no cookie, assume directory was stale. 2495 */ 2496 nfs_dircookie_lock(dnp); 2497 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2498 if (cookiep) { 2499 cookie = *cookiep; 2500 nfs_dircookie_unlock(dnp); 2501 } else { 2502 nfs_dircookie_unlock(dnp); 2503 return (NFSERR_BAD_COOKIE); 2504 } 2505 /* 2506 * Loop around doing readdir rpc's of size nm_readdirsize 2507 * truncated to a multiple of DIRBLKSIZ. 2508 * The stopping criteria is EOF or buffer full. 2509 */ 2510 while (more_dirs && bigenough) { 2511 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2512 mreq = nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2513 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2514 mb = mreq; 2515 bpos = mtod(mb, caddr_t); 2516 nfsm_fhtom(vp, 1); 2517 tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED); 2518 *tl++ = cookie.nfsuquad[0]; 2519 *tl++ = cookie.nfsuquad[1]; 2520 mtx_lock(&dnp->n_mtx); 2521 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2522 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2523 mtx_unlock(&dnp->n_mtx); 2524 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2525 *tl = txdr_unsigned(nmp->nm_rsize); 2526 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred); 2527 nfsm_postop_attr(vp, attrflag); 2528 if (error) { 2529 m_freem(mrep); 2530 goto nfsmout; 2531 } 2532 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2533 mtx_lock(&dnp->n_mtx); 2534 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2535 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2536 mtx_unlock(&dnp->n_mtx); 2537 more_dirs = fxdr_unsigned(int, *tl); 2538 2539 /* loop thru the dir entries, doctoring them to 4bsd form */ 2540 while (more_dirs && bigenough) { 2541 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2542 fileno = fxdr_hyper(tl); 2543 len = fxdr_unsigned(int, *(tl + 2)); 2544 if (len <= 0 || len > NFS_MAXNAMLEN) { 2545 error = EBADRPC; 2546 m_freem(mrep); 2547 goto nfsmout; 2548 } 2549 tlen = nfsm_rndup(len); 2550 if (tlen == len) 2551 tlen += 4; /* To ensure null termination*/ 2552 left = DIRBLKSIZ - blksiz; 2553 if ((tlen + DIRHDSIZ) > left) { 2554 dp->d_reclen += left; 2555 uiop->uio_iov->iov_base = 2556 (char *)uiop->uio_iov->iov_base + left; 2557 uiop->uio_iov->iov_len -= left; 2558 uiop->uio_offset += left; 2559 uiop->uio_resid -= left; 2560 blksiz = 0; 2561 } 2562 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2563 bigenough = 0; 2564 if (bigenough) { 2565 dp = (struct dirent *)uiop->uio_iov->iov_base; 2566 dp->d_fileno = (int)fileno; 2567 dp->d_namlen = len; 2568 dp->d_reclen = tlen + DIRHDSIZ; 2569 dp->d_type = DT_UNKNOWN; 2570 blksiz += dp->d_reclen; 2571 if (blksiz == DIRBLKSIZ) 2572 blksiz = 0; 2573 uiop->uio_offset += DIRHDSIZ; 2574 uiop->uio_resid -= DIRHDSIZ; 2575 uiop->uio_iov->iov_base = 2576 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2577 uiop->uio_iov->iov_len -= DIRHDSIZ; 2578 cnp->cn_nameptr = uiop->uio_iov->iov_base; 2579 cnp->cn_namelen = len; 2580 nfsm_mtouio(uiop, len); 2581 cp = uiop->uio_iov->iov_base; 2582 tlen -= len; 2583 *cp = '\0'; 2584 uiop->uio_iov->iov_base = 2585 (char *)uiop->uio_iov->iov_base + tlen; 2586 uiop->uio_iov->iov_len -= tlen; 2587 uiop->uio_offset += tlen; 2588 uiop->uio_resid -= tlen; 2589 } else 2590 nfsm_adv(nfsm_rndup(len)); 2591 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2592 if (bigenough) { 2593 cookie.nfsuquad[0] = *tl++; 2594 cookie.nfsuquad[1] = *tl++; 2595 } else 2596 tl += 2; 2597 2598 /* 2599 * Since the attributes are before the file handle 2600 * (sigh), we must skip over the attributes and then 2601 * come back and get them. 2602 */ 2603 attrflag = fxdr_unsigned(int, *tl); 2604 if (attrflag) { 2605 dpossav1 = dpos; 2606 mdsav1 = md; 2607 nfsm_adv(NFSX_V3FATTR); 2608 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2609 doit = fxdr_unsigned(int, *tl); 2610 /* 2611 * Skip loading the attrs for "..". There's a 2612 * race between loading the attrs here and 2613 * lookups that look for the directory currently 2614 * being read (in the parent). We try to acquire 2615 * the exclusive lock on ".." here, owning the 2616 * lock on the directory being read. Lookup will 2617 * hold the lock on ".." and try to acquire the 2618 * lock on the directory being read. 2619 * 2620 * There are other ways of fixing this, one would 2621 * be to do a trylock on the ".." vnode and skip 2622 * loading the attrs on ".." if it happens to be 2623 * locked by another process. But skipping the 2624 * attrload on ".." seems the easiest option. 2625 */ 2626 if (strcmp(dp->d_name, "..") == 0) { 2627 doit = 0; 2628 /* 2629 * We've already skipped over the attrs, 2630 * skip over the filehandle. And store d_type 2631 * as VDIR. 2632 */ 2633 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2634 i = fxdr_unsigned(int, *tl); 2635 nfsm_adv(nfsm_rndup(i)); 2636 dp->d_type = IFTODT(VTTOIF(VDIR)); 2637 } 2638 if (doit) { 2639 nfsm_getfh(fhp, fhsize, 1); 2640 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2641 VREF(vp); 2642 newvp = vp; 2643 np = dnp; 2644 } else { 2645 error = nfs_nget(vp->v_mount, fhp, 2646 fhsize, &np, LK_EXCLUSIVE); 2647 if (error) 2648 doit = 0; 2649 else 2650 newvp = NFSTOV(np); 2651 } 2652 } 2653 if (doit && bigenough) { 2654 dpossav2 = dpos; 2655 dpos = dpossav1; 2656 mdsav2 = md; 2657 md = mdsav1; 2658 nfsm_loadattr(newvp, NULL); 2659 dpos = dpossav2; 2660 md = mdsav2; 2661 dp->d_type = 2662 IFTODT(VTTOIF(np->n_vattr.va_type)); 2663 ndp->ni_vp = newvp; 2664 /* Update n_ctime, so subsequent lookup doesn't purge entry */ 2665 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 2666 cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp); 2667 } 2668 } else { 2669 /* Just skip over the file handle */ 2670 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2671 i = fxdr_unsigned(int, *tl); 2672 if (i) { 2673 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2674 fhsize = fxdr_unsigned(int, *tl); 2675 nfsm_adv(nfsm_rndup(fhsize)); 2676 } 2677 } 2678 if (newvp != NULLVP) { 2679 if (newvp == vp) 2680 vrele(newvp); 2681 else 2682 vput(newvp); 2683 newvp = NULLVP; 2684 } 2685 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2686 more_dirs = fxdr_unsigned(int, *tl); 2687 } 2688 /* 2689 * If at end of rpc data, get the eof boolean 2690 */ 2691 if (!more_dirs) { 2692 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2693 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2694 } 2695 m_freem(mrep); 2696 } 2697 /* 2698 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2699 * by increasing d_reclen for the last record. 2700 */ 2701 if (blksiz > 0) { 2702 left = DIRBLKSIZ - blksiz; 2703 dp->d_reclen += left; 2704 uiop->uio_iov->iov_base = 2705 (char *)uiop->uio_iov->iov_base + left; 2706 uiop->uio_iov->iov_len -= left; 2707 uiop->uio_offset += left; 2708 uiop->uio_resid -= left; 2709 } 2710 2711 /* 2712 * We are now either at the end of the directory or have filled the 2713 * block. 2714 */ 2715 if (bigenough) 2716 dnp->n_direofoffset = uiop->uio_offset; 2717 else { 2718 if (uiop->uio_resid > 0) 2719 nfs_printf("EEK! readdirplusrpc resid > 0\n"); 2720 nfs_dircookie_lock(dnp); 2721 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2722 *cookiep = cookie; 2723 nfs_dircookie_unlock(dnp); 2724 } 2725 nfsmout: 2726 if (newvp != NULLVP) { 2727 if (newvp == vp) 2728 vrele(newvp); 2729 else 2730 vput(newvp); 2731 newvp = NULLVP; 2732 } 2733 return (error); 2734 } 2735 2736 /* 2737 * Silly rename. To make the NFS filesystem that is stateless look a little 2738 * more like the "ufs" a remove of an active vnode is translated to a rename 2739 * to a funny looking filename that is removed by nfs_inactive on the 2740 * nfsnode. There is the potential for another process on a different client 2741 * to create the same funny name between the nfs_lookitup() fails and the 2742 * nfs_rename() completes, but... 2743 */ 2744 static int 2745 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2746 { 2747 struct sillyrename *sp; 2748 struct nfsnode *np; 2749 int error; 2750 short pid; 2751 unsigned int lticks; 2752 2753 cache_purge(dvp); 2754 np = VTONFS(vp); 2755 #ifndef DIAGNOSTIC 2756 if (vp->v_type == VDIR) 2757 panic("nfs: sillyrename dir"); 2758 #endif 2759 sp = malloc(sizeof (struct sillyrename), 2760 M_NFSREQ, M_WAITOK); 2761 sp->s_cred = crhold(cnp->cn_cred); 2762 sp->s_dvp = dvp; 2763 sp->s_removeit = nfs_removeit; 2764 VREF(dvp); 2765 2766 /* 2767 * Fudge together a funny name. 2768 * Changing the format of the funny name to accomodate more 2769 * sillynames per directory. 2770 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2771 * CPU ticks since boot. 2772 */ 2773 pid = cnp->cn_thread->td_proc->p_pid; 2774 lticks = (unsigned int)ticks; 2775 for ( ; ; ) { 2776 sp->s_namlen = sprintf(sp->s_name, 2777 ".nfs.%08x.%04x4.4", lticks, 2778 pid); 2779 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2780 cnp->cn_thread, NULL)) 2781 break; 2782 lticks++; 2783 } 2784 error = nfs_renameit(dvp, cnp, sp); 2785 if (error) 2786 goto bad; 2787 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2788 cnp->cn_thread, &np); 2789 np->n_sillyrename = sp; 2790 return (0); 2791 bad: 2792 vrele(sp->s_dvp); 2793 crfree(sp->s_cred); 2794 free((caddr_t)sp, M_NFSREQ); 2795 return (error); 2796 } 2797 2798 /* 2799 * Look up a file name and optionally either update the file handle or 2800 * allocate an nfsnode, depending on the value of npp. 2801 * npp == NULL --> just do the lookup 2802 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2803 * handled too 2804 * *npp != NULL --> update the file handle in the vnode 2805 */ 2806 static int 2807 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2808 struct thread *td, struct nfsnode **npp) 2809 { 2810 struct vnode *newvp = NULL; 2811 struct nfsnode *np, *dnp = VTONFS(dvp); 2812 caddr_t bpos, dpos; 2813 int error = 0, fhlen, attrflag; 2814 struct mbuf *mreq, *mrep, *md, *mb; 2815 nfsfh_t *nfhp; 2816 int v3 = NFS_ISV3(dvp); 2817 2818 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2819 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2820 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2821 mb = mreq; 2822 bpos = mtod(mb, caddr_t); 2823 nfsm_fhtom(dvp, v3); 2824 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2825 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2826 if (npp && !error) { 2827 nfsm_getfh(nfhp, fhlen, v3); 2828 if (*npp) { 2829 np = *npp; 2830 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2831 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2832 np->n_fhp = &np->n_fh; 2833 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2834 np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK); 2835 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2836 np->n_fhsize = fhlen; 2837 newvp = NFSTOV(np); 2838 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2839 VREF(dvp); 2840 newvp = dvp; 2841 } else { 2842 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, LK_EXCLUSIVE); 2843 if (error) { 2844 m_freem(mrep); 2845 return (error); 2846 } 2847 newvp = NFSTOV(np); 2848 } 2849 if (v3) { 2850 nfsm_postop_attr(newvp, attrflag); 2851 if (!attrflag && *npp == NULL) { 2852 m_freem(mrep); 2853 if (newvp == dvp) 2854 vrele(newvp); 2855 else 2856 vput(newvp); 2857 return (ENOENT); 2858 } 2859 } else 2860 nfsm_loadattr(newvp, NULL); 2861 } 2862 m_freem(mrep); 2863 nfsmout: 2864 if (npp && *npp == NULL) { 2865 if (error) { 2866 if (newvp) { 2867 if (newvp == dvp) 2868 vrele(newvp); 2869 else 2870 vput(newvp); 2871 } 2872 } else 2873 *npp = np; 2874 } 2875 return (error); 2876 } 2877 2878 /* 2879 * Nfs Version 3 commit rpc 2880 */ 2881 int 2882 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2883 struct thread *td) 2884 { 2885 u_int32_t *tl; 2886 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2887 caddr_t bpos, dpos; 2888 int error = 0, wccflag = NFSV3_WCCRATTR; 2889 struct mbuf *mreq, *mrep, *md, *mb; 2890 2891 mtx_lock(&nmp->nm_mtx); 2892 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2893 mtx_unlock(&nmp->nm_mtx); 2894 return (0); 2895 } 2896 mtx_unlock(&nmp->nm_mtx); 2897 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2898 mreq = nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2899 mb = mreq; 2900 bpos = mtod(mb, caddr_t); 2901 nfsm_fhtom(vp, 1); 2902 tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED); 2903 txdr_hyper(offset, tl); 2904 tl += 2; 2905 *tl = txdr_unsigned(cnt); 2906 nfsm_request(vp, NFSPROC_COMMIT, td, cred); 2907 nfsm_wcc_data(vp, wccflag); 2908 if (!error) { 2909 tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF); 2910 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2911 NFSX_V3WRITEVERF)) { 2912 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2913 NFSX_V3WRITEVERF); 2914 error = NFSERR_STALEWRITEVERF; 2915 } 2916 } 2917 m_freem(mrep); 2918 nfsmout: 2919 return (error); 2920 } 2921 2922 /* 2923 * Strategy routine. 2924 * For async requests when nfsiod(s) are running, queue the request by 2925 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2926 * request. 2927 */ 2928 static int 2929 nfs_strategy(struct vop_strategy_args *ap) 2930 { 2931 struct buf *bp = ap->a_bp; 2932 struct ucred *cr; 2933 2934 KASSERT(!(bp->b_flags & B_DONE), 2935 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2936 BUF_ASSERT_HELD(bp); 2937 2938 if (bp->b_iocmd == BIO_READ) 2939 cr = bp->b_rcred; 2940 else 2941 cr = bp->b_wcred; 2942 2943 /* 2944 * If the op is asynchronous and an i/o daemon is waiting 2945 * queue the request, wake it up and wait for completion 2946 * otherwise just do it ourselves. 2947 */ 2948 if ((bp->b_flags & B_ASYNC) == 0 || 2949 nfs_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread)) 2950 (void)nfs_doio(ap->a_vp, bp, cr, curthread); 2951 return (0); 2952 } 2953 2954 /* 2955 * fsync vnode op. Just call nfs_flush() with commit == 1. 2956 */ 2957 /* ARGSUSED */ 2958 static int 2959 nfs_fsync(struct vop_fsync_args *ap) 2960 { 2961 2962 return (nfs_flush(ap->a_vp, ap->a_waitfor, 1)); 2963 } 2964 2965 /* 2966 * Flush all the blocks associated with a vnode. 2967 * Walk through the buffer pool and push any dirty pages 2968 * associated with the vnode. 2969 */ 2970 static int 2971 nfs_flush(struct vnode *vp, int waitfor, int commit) 2972 { 2973 struct nfsnode *np = VTONFS(vp); 2974 struct buf *bp; 2975 int i; 2976 struct buf *nbp; 2977 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2978 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2979 int passone = 1; 2980 u_quad_t off, endoff, toff; 2981 struct ucred* wcred = NULL; 2982 struct buf **bvec = NULL; 2983 struct bufobj *bo; 2984 struct thread *td = curthread; 2985 #ifndef NFS_COMMITBVECSIZ 2986 #define NFS_COMMITBVECSIZ 20 2987 #endif 2988 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2989 int bvecsize = 0, bveccount; 2990 2991 if (nmp->nm_flag & NFSMNT_INT) 2992 slpflag = NFS_PCATCH; 2993 if (!commit) 2994 passone = 0; 2995 bo = &vp->v_bufobj; 2996 /* 2997 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2998 * server, but has not been committed to stable storage on the server 2999 * yet. On the first pass, the byte range is worked out and the commit 3000 * rpc is done. On the second pass, nfs_writebp() is called to do the 3001 * job. 3002 */ 3003 again: 3004 off = (u_quad_t)-1; 3005 endoff = 0; 3006 bvecpos = 0; 3007 if (NFS_ISV3(vp) && commit) { 3008 if (bvec != NULL && bvec != bvec_on_stack) 3009 free(bvec, M_TEMP); 3010 /* 3011 * Count up how many buffers waiting for a commit. 3012 */ 3013 bveccount = 0; 3014 BO_LOCK(bo); 3015 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3016 if (!BUF_ISLOCKED(bp) && 3017 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 3018 == (B_DELWRI | B_NEEDCOMMIT)) 3019 bveccount++; 3020 } 3021 /* 3022 * Allocate space to remember the list of bufs to commit. It is 3023 * important to use M_NOWAIT here to avoid a race with nfs_write. 3024 * If we can't get memory (for whatever reason), we will end up 3025 * committing the buffers one-by-one in the loop below. 3026 */ 3027 if (bveccount > NFS_COMMITBVECSIZ) { 3028 /* 3029 * Release the vnode interlock to avoid a lock 3030 * order reversal. 3031 */ 3032 BO_UNLOCK(bo); 3033 bvec = (struct buf **) 3034 malloc(bveccount * sizeof(struct buf *), 3035 M_TEMP, M_NOWAIT); 3036 BO_LOCK(bo); 3037 if (bvec == NULL) { 3038 bvec = bvec_on_stack; 3039 bvecsize = NFS_COMMITBVECSIZ; 3040 } else 3041 bvecsize = bveccount; 3042 } else { 3043 bvec = bvec_on_stack; 3044 bvecsize = NFS_COMMITBVECSIZ; 3045 } 3046 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3047 if (bvecpos >= bvecsize) 3048 break; 3049 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3050 nbp = TAILQ_NEXT(bp, b_bobufs); 3051 continue; 3052 } 3053 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3054 (B_DELWRI | B_NEEDCOMMIT)) { 3055 BUF_UNLOCK(bp); 3056 nbp = TAILQ_NEXT(bp, b_bobufs); 3057 continue; 3058 } 3059 BO_UNLOCK(bo); 3060 bremfree(bp); 3061 /* 3062 * Work out if all buffers are using the same cred 3063 * so we can deal with them all with one commit. 3064 * 3065 * NOTE: we are not clearing B_DONE here, so we have 3066 * to do it later on in this routine if we intend to 3067 * initiate I/O on the bp. 3068 * 3069 * Note: to avoid loopback deadlocks, we do not 3070 * assign b_runningbufspace. 3071 */ 3072 if (wcred == NULL) 3073 wcred = bp->b_wcred; 3074 else if (wcred != bp->b_wcred) 3075 wcred = NOCRED; 3076 vfs_busy_pages(bp, 1); 3077 3078 BO_LOCK(bo); 3079 /* 3080 * bp is protected by being locked, but nbp is not 3081 * and vfs_busy_pages() may sleep. We have to 3082 * recalculate nbp. 3083 */ 3084 nbp = TAILQ_NEXT(bp, b_bobufs); 3085 3086 /* 3087 * A list of these buffers is kept so that the 3088 * second loop knows which buffers have actually 3089 * been committed. This is necessary, since there 3090 * may be a race between the commit rpc and new 3091 * uncommitted writes on the file. 3092 */ 3093 bvec[bvecpos++] = bp; 3094 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3095 bp->b_dirtyoff; 3096 if (toff < off) 3097 off = toff; 3098 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 3099 if (toff > endoff) 3100 endoff = toff; 3101 } 3102 BO_UNLOCK(bo); 3103 } 3104 if (bvecpos > 0) { 3105 /* 3106 * Commit data on the server, as required. 3107 * If all bufs are using the same wcred, then use that with 3108 * one call for all of them, otherwise commit each one 3109 * separately. 3110 */ 3111 if (wcred != NOCRED) 3112 retv = nfs_commit(vp, off, (int)(endoff - off), 3113 wcred, td); 3114 else { 3115 retv = 0; 3116 for (i = 0; i < bvecpos; i++) { 3117 off_t off, size; 3118 bp = bvec[i]; 3119 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3120 bp->b_dirtyoff; 3121 size = (u_quad_t)(bp->b_dirtyend 3122 - bp->b_dirtyoff); 3123 retv = nfs_commit(vp, off, (int)size, 3124 bp->b_wcred, td); 3125 if (retv) break; 3126 } 3127 } 3128 3129 if (retv == NFSERR_STALEWRITEVERF) 3130 nfs_clearcommit(vp->v_mount); 3131 3132 /* 3133 * Now, either mark the blocks I/O done or mark the 3134 * blocks dirty, depending on whether the commit 3135 * succeeded. 3136 */ 3137 for (i = 0; i < bvecpos; i++) { 3138 bp = bvec[i]; 3139 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3140 if (retv) { 3141 /* 3142 * Error, leave B_DELWRI intact 3143 */ 3144 vfs_unbusy_pages(bp); 3145 brelse(bp); 3146 } else { 3147 /* 3148 * Success, remove B_DELWRI ( bundirty() ). 3149 * 3150 * b_dirtyoff/b_dirtyend seem to be NFS 3151 * specific. We should probably move that 3152 * into bundirty(). XXX 3153 */ 3154 bufobj_wref(bo); 3155 bp->b_flags |= B_ASYNC; 3156 bundirty(bp); 3157 bp->b_flags &= ~B_DONE; 3158 bp->b_ioflags &= ~BIO_ERROR; 3159 bp->b_dirtyoff = bp->b_dirtyend = 0; 3160 bufdone(bp); 3161 } 3162 } 3163 } 3164 3165 /* 3166 * Start/do any write(s) that are required. 3167 */ 3168 loop: 3169 BO_LOCK(bo); 3170 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3171 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3172 if (waitfor != MNT_WAIT || passone) 3173 continue; 3174 3175 error = BUF_TIMELOCK(bp, 3176 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 3177 BO_MTX(bo), "nfsfsync", slpflag, slptimeo); 3178 if (error == 0) { 3179 BUF_UNLOCK(bp); 3180 goto loop; 3181 } 3182 if (error == ENOLCK) { 3183 error = 0; 3184 goto loop; 3185 } 3186 if (nfs_sigintr(nmp, td)) { 3187 error = EINTR; 3188 goto done; 3189 } 3190 if (slpflag & PCATCH) { 3191 slpflag = 0; 3192 slptimeo = 2 * hz; 3193 } 3194 goto loop; 3195 } 3196 if ((bp->b_flags & B_DELWRI) == 0) 3197 panic("nfs_fsync: not dirty"); 3198 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3199 BUF_UNLOCK(bp); 3200 continue; 3201 } 3202 BO_UNLOCK(bo); 3203 bremfree(bp); 3204 if (passone || !commit) 3205 bp->b_flags |= B_ASYNC; 3206 else 3207 bp->b_flags |= B_ASYNC; 3208 bwrite(bp); 3209 if (nfs_sigintr(nmp, td)) { 3210 error = EINTR; 3211 goto done; 3212 } 3213 goto loop; 3214 } 3215 if (passone) { 3216 passone = 0; 3217 BO_UNLOCK(bo); 3218 goto again; 3219 } 3220 if (waitfor == MNT_WAIT) { 3221 while (bo->bo_numoutput) { 3222 error = bufobj_wwait(bo, slpflag, slptimeo); 3223 if (error) { 3224 BO_UNLOCK(bo); 3225 error = nfs_sigintr(nmp, td); 3226 if (error) 3227 goto done; 3228 if (slpflag & PCATCH) { 3229 slpflag = 0; 3230 slptimeo = 2 * hz; 3231 } 3232 BO_LOCK(bo); 3233 } 3234 } 3235 if (bo->bo_dirty.bv_cnt != 0 && commit) { 3236 BO_UNLOCK(bo); 3237 goto loop; 3238 } 3239 /* 3240 * Wait for all the async IO requests to drain 3241 */ 3242 BO_UNLOCK(bo); 3243 mtx_lock(&np->n_mtx); 3244 while (np->n_directio_asyncwr > 0) { 3245 np->n_flag |= NFSYNCWAIT; 3246 error = nfs_msleep(td, (caddr_t)&np->n_directio_asyncwr, 3247 &np->n_mtx, slpflag | (PRIBIO + 1), 3248 "nfsfsync", 0); 3249 if (error) { 3250 if (nfs_sigintr(nmp, td)) { 3251 mtx_unlock(&np->n_mtx); 3252 error = EINTR; 3253 goto done; 3254 } 3255 } 3256 } 3257 mtx_unlock(&np->n_mtx); 3258 } else 3259 BO_UNLOCK(bo); 3260 mtx_lock(&np->n_mtx); 3261 if (np->n_flag & NWRITEERR) { 3262 error = np->n_error; 3263 np->n_flag &= ~NWRITEERR; 3264 } 3265 if (commit && bo->bo_dirty.bv_cnt == 0 && 3266 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) 3267 np->n_flag &= ~NMODIFIED; 3268 mtx_unlock(&np->n_mtx); 3269 done: 3270 if (bvec != NULL && bvec != bvec_on_stack) 3271 free(bvec, M_TEMP); 3272 return (error); 3273 } 3274 3275 /* 3276 * NFS advisory byte-level locks. 3277 */ 3278 static int 3279 nfs_advlock(struct vop_advlock_args *ap) 3280 { 3281 struct vnode *vp = ap->a_vp; 3282 u_quad_t size; 3283 int error; 3284 3285 error = vn_lock(vp, LK_SHARED); 3286 if (error) 3287 return (error); 3288 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3289 size = VTONFS(vp)->n_size; 3290 VOP_UNLOCK(vp, 0); 3291 error = lf_advlock(ap, &(vp->v_lockf), size); 3292 } else { 3293 if (nfs_advlock_p) 3294 error = nfs_advlock_p(ap); 3295 else 3296 error = ENOLCK; 3297 } 3298 3299 return (error); 3300 } 3301 3302 /* 3303 * NFS advisory byte-level locks. 3304 */ 3305 static int 3306 nfs_advlockasync(struct vop_advlockasync_args *ap) 3307 { 3308 struct vnode *vp = ap->a_vp; 3309 u_quad_t size; 3310 int error; 3311 3312 error = vn_lock(vp, LK_SHARED); 3313 if (error) 3314 return (error); 3315 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3316 size = VTONFS(vp)->n_size; 3317 VOP_UNLOCK(vp, 0); 3318 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3319 } else { 3320 VOP_UNLOCK(vp, 0); 3321 error = EOPNOTSUPP; 3322 } 3323 return (error); 3324 } 3325 3326 /* 3327 * Print out the contents of an nfsnode. 3328 */ 3329 static int 3330 nfs_print(struct vop_print_args *ap) 3331 { 3332 struct vnode *vp = ap->a_vp; 3333 struct nfsnode *np = VTONFS(vp); 3334 3335 nfs_printf("\tfileid %ld fsid 0x%x", 3336 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3337 if (vp->v_type == VFIFO) 3338 fifo_printinfo(vp); 3339 printf("\n"); 3340 return (0); 3341 } 3342 3343 /* 3344 * This is the "real" nfs::bwrite(struct buf*). 3345 * We set B_CACHE if this is a VMIO buffer. 3346 */ 3347 int 3348 nfs_writebp(struct buf *bp, int force __unused, struct thread *td) 3349 { 3350 int s; 3351 int oldflags = bp->b_flags; 3352 #if 0 3353 int retv = 1; 3354 off_t off; 3355 #endif 3356 3357 BUF_ASSERT_HELD(bp); 3358 3359 if (bp->b_flags & B_INVAL) { 3360 brelse(bp); 3361 return(0); 3362 } 3363 3364 bp->b_flags |= B_CACHE; 3365 3366 /* 3367 * Undirty the bp. We will redirty it later if the I/O fails. 3368 */ 3369 3370 s = splbio(); 3371 bundirty(bp); 3372 bp->b_flags &= ~B_DONE; 3373 bp->b_ioflags &= ~BIO_ERROR; 3374 bp->b_iocmd = BIO_WRITE; 3375 3376 bufobj_wref(bp->b_bufobj); 3377 curthread->td_ru.ru_oublock++; 3378 splx(s); 3379 3380 /* 3381 * Note: to avoid loopback deadlocks, we do not 3382 * assign b_runningbufspace. 3383 */ 3384 vfs_busy_pages(bp, 1); 3385 3386 BUF_KERNPROC(bp); 3387 bp->b_iooffset = dbtob(bp->b_blkno); 3388 bstrategy(bp); 3389 3390 if( (oldflags & B_ASYNC) == 0) { 3391 int rtval = bufwait(bp); 3392 3393 if (oldflags & B_DELWRI) { 3394 s = splbio(); 3395 reassignbuf(bp); 3396 splx(s); 3397 } 3398 brelse(bp); 3399 return (rtval); 3400 } 3401 3402 return (0); 3403 } 3404 3405 /* 3406 * nfs special file access vnode op. 3407 * Essentially just get vattr and then imitate iaccess() since the device is 3408 * local to the client. 3409 */ 3410 static int 3411 nfsspec_access(struct vop_access_args *ap) 3412 { 3413 struct vattr *vap; 3414 struct ucred *cred = ap->a_cred; 3415 struct vnode *vp = ap->a_vp; 3416 accmode_t accmode = ap->a_accmode; 3417 struct vattr vattr; 3418 int error; 3419 3420 /* 3421 * Disallow write attempts on filesystems mounted read-only; 3422 * unless the file is a socket, fifo, or a block or character 3423 * device resident on the filesystem. 3424 */ 3425 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3426 switch (vp->v_type) { 3427 case VREG: 3428 case VDIR: 3429 case VLNK: 3430 return (EROFS); 3431 default: 3432 break; 3433 } 3434 } 3435 vap = &vattr; 3436 error = VOP_GETATTR(vp, vap, cred); 3437 if (error) 3438 goto out; 3439 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3440 accmode, cred, NULL); 3441 out: 3442 return error; 3443 } 3444 3445 /* 3446 * Read wrapper for fifos. 3447 */ 3448 static int 3449 nfsfifo_read(struct vop_read_args *ap) 3450 { 3451 struct nfsnode *np = VTONFS(ap->a_vp); 3452 int error; 3453 3454 /* 3455 * Set access flag. 3456 */ 3457 mtx_lock(&np->n_mtx); 3458 np->n_flag |= NACC; 3459 getnanotime(&np->n_atim); 3460 mtx_unlock(&np->n_mtx); 3461 error = fifo_specops.vop_read(ap); 3462 return error; 3463 } 3464 3465 /* 3466 * Write wrapper for fifos. 3467 */ 3468 static int 3469 nfsfifo_write(struct vop_write_args *ap) 3470 { 3471 struct nfsnode *np = VTONFS(ap->a_vp); 3472 3473 /* 3474 * Set update flag. 3475 */ 3476 mtx_lock(&np->n_mtx); 3477 np->n_flag |= NUPD; 3478 getnanotime(&np->n_mtim); 3479 mtx_unlock(&np->n_mtx); 3480 return(fifo_specops.vop_write(ap)); 3481 } 3482 3483 /* 3484 * Close wrapper for fifos. 3485 * 3486 * Update the times on the nfsnode then do fifo close. 3487 */ 3488 static int 3489 nfsfifo_close(struct vop_close_args *ap) 3490 { 3491 struct vnode *vp = ap->a_vp; 3492 struct nfsnode *np = VTONFS(vp); 3493 struct vattr vattr; 3494 struct timespec ts; 3495 3496 mtx_lock(&np->n_mtx); 3497 if (np->n_flag & (NACC | NUPD)) { 3498 getnanotime(&ts); 3499 if (np->n_flag & NACC) 3500 np->n_atim = ts; 3501 if (np->n_flag & NUPD) 3502 np->n_mtim = ts; 3503 np->n_flag |= NCHG; 3504 if (vrefcnt(vp) == 1 && 3505 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3506 VATTR_NULL(&vattr); 3507 if (np->n_flag & NACC) 3508 vattr.va_atime = np->n_atim; 3509 if (np->n_flag & NUPD) 3510 vattr.va_mtime = np->n_mtim; 3511 mtx_unlock(&np->n_mtx); 3512 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3513 goto out; 3514 } 3515 } 3516 mtx_unlock(&np->n_mtx); 3517 out: 3518 return (fifo_specops.vop_close(ap)); 3519 } 3520 3521 /* 3522 * Just call nfs_writebp() with the force argument set to 1. 3523 * 3524 * NOTE: B_DONE may or may not be set in a_bp on call. 3525 */ 3526 static int 3527 nfs_bwrite(struct buf *bp) 3528 { 3529 3530 return (nfs_writebp(bp, 1, curthread)); 3531 } 3532 3533 struct buf_ops buf_ops_nfs = { 3534 .bop_name = "buf_ops_nfs", 3535 .bop_write = nfs_bwrite, 3536 .bop_strategy = bufstrategy, 3537 .bop_sync = bufsync, 3538 .bop_bdflush = bufbdflush, 3539 };
Cache object: 00fe2c98f5a62e7e3b3fb60173fdfe86
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