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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/8.0/sys/nfsclient/nfs_vnops.c 198424 2009-10-23 19:52:29Z 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 struct proc *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; 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 newvp = *vpp; 963 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred) 964 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 965 nfsstats.lookupcache_hits++; 966 if (cnp->cn_nameiop != LOOKUP && 967 (flags & ISLASTCN)) 968 cnp->cn_flags |= SAVENAME; 969 return (0); 970 } 971 cache_purge(newvp); 972 if (dvp != newvp) 973 vput(newvp); 974 else 975 vrele(newvp); 976 *vpp = NULLVP; 977 } else if (error == ENOENT) { 978 if (dvp->v_iflag & VI_DOOMED) 979 return (ENOENT); 980 /* 981 * We only accept a negative hit in the cache if the 982 * modification time of the parent directory matches 983 * our cached copy. Otherwise, we discard all of the 984 * negative cache entries for this directory. 985 */ 986 if (VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && 987 vattr.va_mtime.tv_sec == np->n_dmtime) { 988 nfsstats.lookupcache_hits++; 989 return (ENOENT); 990 } 991 cache_purge_negative(dvp); 992 mtx_lock(&np->n_mtx); 993 np->n_dmtime = 0; 994 mtx_unlock(&np->n_mtx); 995 } 996 997 /* 998 * Cache the modification time of the parent directory in case 999 * the lookup fails and results in adding the first negative 1000 * name cache entry for the directory. Since this is reading 1001 * a single time_t, don't bother with locking. The 1002 * modification time may be a bit stale, but it must be read 1003 * before performing the lookup RPC to prevent a race where 1004 * another lookup updates the timestamp on the directory after 1005 * the lookup RPC has been performed on the server but before 1006 * n_dmtime is set at the end of this function. 1007 */ 1008 dmtime = np->n_vattr.va_mtime.tv_sec; 1009 error = 0; 1010 newvp = NULLVP; 1011 nfsstats.lookupcache_misses++; 1012 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 1013 len = cnp->cn_namelen; 1014 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 1015 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 1016 mb = mreq; 1017 bpos = mtod(mb, caddr_t); 1018 nfsm_fhtom(dvp, v3); 1019 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1020 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred); 1021 if (error) { 1022 if (v3) { 1023 nfsm_postop_attr(dvp, attrflag); 1024 m_freem(mrep); 1025 } 1026 goto nfsmout; 1027 } 1028 nfsm_getfh(fhp, fhsize, v3); 1029 1030 /* 1031 * Handle RENAME case... 1032 */ 1033 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 1034 if (NFS_CMPFH(np, fhp, fhsize)) { 1035 m_freem(mrep); 1036 return (EISDIR); 1037 } 1038 error = nfs_nget(mp, fhp, fhsize, &np, LK_EXCLUSIVE); 1039 if (error) { 1040 m_freem(mrep); 1041 return (error); 1042 } 1043 newvp = NFSTOV(np); 1044 if (v3) { 1045 nfsm_postop_attr(newvp, attrflag); 1046 nfsm_postop_attr(dvp, attrflag); 1047 } else 1048 nfsm_loadattr(newvp, NULL); 1049 *vpp = newvp; 1050 m_freem(mrep); 1051 cnp->cn_flags |= SAVENAME; 1052 return (0); 1053 } 1054 1055 if (flags & ISDOTDOT) { 1056 ltype = VOP_ISLOCKED(dvp); 1057 error = vfs_busy(mp, MBF_NOWAIT); 1058 if (error != 0) { 1059 vfs_ref(mp); 1060 VOP_UNLOCK(dvp, 0); 1061 error = vfs_busy(mp, 0); 1062 vn_lock(dvp, ltype | LK_RETRY); 1063 vfs_rel(mp); 1064 if (error == 0 && (dvp->v_iflag & VI_DOOMED)) { 1065 vfs_unbusy(mp); 1066 error = ENOENT; 1067 } 1068 if (error != 0) { 1069 m_freem(mrep); 1070 return (error); 1071 } 1072 } 1073 VOP_UNLOCK(dvp, 0); 1074 error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags); 1075 if (error == 0) 1076 newvp = NFSTOV(np); 1077 vfs_unbusy(mp); 1078 if (newvp != dvp) 1079 vn_lock(dvp, ltype | LK_RETRY); 1080 if (dvp->v_iflag & VI_DOOMED) { 1081 if (error == 0) { 1082 if (newvp == dvp) 1083 vrele(newvp); 1084 else 1085 vput(newvp); 1086 } 1087 error = ENOENT; 1088 } 1089 if (error) { 1090 m_freem(mrep); 1091 return (error); 1092 } 1093 } else if (NFS_CMPFH(np, fhp, fhsize)) { 1094 VREF(dvp); 1095 newvp = dvp; 1096 } else { 1097 error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags); 1098 if (error) { 1099 m_freem(mrep); 1100 return (error); 1101 } 1102 newvp = NFSTOV(np); 1103 } 1104 if (v3) { 1105 nfsm_postop_attr(newvp, attrflag); 1106 nfsm_postop_attr(dvp, attrflag); 1107 } else 1108 nfsm_loadattr(newvp, NULL); 1109 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1110 cnp->cn_flags |= SAVENAME; 1111 if ((cnp->cn_flags & MAKEENTRY) && 1112 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) { 1113 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 1114 cache_enter(dvp, newvp, cnp); 1115 } 1116 *vpp = newvp; 1117 m_freem(mrep); 1118 nfsmout: 1119 if (error) { 1120 if (newvp != NULLVP) { 1121 vput(newvp); 1122 *vpp = NULLVP; 1123 } 1124 1125 if (error != ENOENT) 1126 goto done; 1127 1128 /* The requested file was not found. */ 1129 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1130 (flags & ISLASTCN)) { 1131 /* 1132 * XXX: UFS does a full VOP_ACCESS(dvp, 1133 * VWRITE) here instead of just checking 1134 * MNT_RDONLY. 1135 */ 1136 if (mp->mnt_flag & MNT_RDONLY) 1137 return (EROFS); 1138 cnp->cn_flags |= SAVENAME; 1139 return (EJUSTRETURN); 1140 } 1141 1142 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) { 1143 /* 1144 * Maintain n_dmtime as the modification time 1145 * of the parent directory when the oldest -ve 1146 * name cache entry for this directory was 1147 * added. If a -ve cache entry has already 1148 * been added with a newer modification time 1149 * by a concurrent lookup, then don't bother 1150 * adding a cache entry. The modification 1151 * time of the directory might have changed 1152 * due to the file this lookup failed to find 1153 * being created. In that case a subsequent 1154 * lookup would incorrectly use the entry 1155 * added here instead of doing an extra 1156 * lookup. 1157 */ 1158 mtx_lock(&np->n_mtx); 1159 if (np->n_dmtime <= dmtime) { 1160 if (np->n_dmtime == 0) 1161 np->n_dmtime = dmtime; 1162 mtx_unlock(&np->n_mtx); 1163 cache_enter(dvp, NULL, cnp); 1164 } else 1165 mtx_unlock(&np->n_mtx); 1166 } 1167 return (ENOENT); 1168 } 1169 done: 1170 return (error); 1171 } 1172 1173 /* 1174 * nfs read call. 1175 * Just call nfs_bioread() to do the work. 1176 */ 1177 static int 1178 nfs_read(struct vop_read_args *ap) 1179 { 1180 struct vnode *vp = ap->a_vp; 1181 1182 switch (vp->v_type) { 1183 case VREG: 1184 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 1185 case VDIR: 1186 return (EISDIR); 1187 default: 1188 return (EOPNOTSUPP); 1189 } 1190 } 1191 1192 /* 1193 * nfs readlink call 1194 */ 1195 static int 1196 nfs_readlink(struct vop_readlink_args *ap) 1197 { 1198 struct vnode *vp = ap->a_vp; 1199 1200 if (vp->v_type != VLNK) 1201 return (EINVAL); 1202 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred)); 1203 } 1204 1205 /* 1206 * Do a readlink rpc. 1207 * Called by nfs_doio() from below the buffer cache. 1208 */ 1209 int 1210 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1211 { 1212 caddr_t bpos, dpos; 1213 int error = 0, len, attrflag; 1214 struct mbuf *mreq, *mrep, *md, *mb; 1215 int v3 = NFS_ISV3(vp); 1216 1217 nfsstats.rpccnt[NFSPROC_READLINK]++; 1218 mreq = nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 1219 mb = mreq; 1220 bpos = mtod(mb, caddr_t); 1221 nfsm_fhtom(vp, v3); 1222 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred); 1223 if (v3) 1224 nfsm_postop_attr(vp, attrflag); 1225 if (!error) { 1226 nfsm_strsiz(len, NFS_MAXPATHLEN); 1227 if (len == NFS_MAXPATHLEN) { 1228 struct nfsnode *np = VTONFS(vp); 1229 mtx_lock(&np->n_mtx); 1230 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1231 len = np->n_size; 1232 mtx_unlock(&np->n_mtx); 1233 } 1234 nfsm_mtouio(uiop, len); 1235 } 1236 m_freem(mrep); 1237 nfsmout: 1238 return (error); 1239 } 1240 1241 /* 1242 * nfs read rpc call 1243 * Ditto above 1244 */ 1245 int 1246 nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1247 { 1248 u_int32_t *tl; 1249 caddr_t bpos, dpos; 1250 struct mbuf *mreq, *mrep, *md, *mb; 1251 struct nfsmount *nmp; 1252 int error = 0, len, retlen, tsiz, eof, attrflag; 1253 int v3 = NFS_ISV3(vp); 1254 int rsize; 1255 1256 #ifndef nolint 1257 eof = 0; 1258 #endif 1259 nmp = VFSTONFS(vp->v_mount); 1260 tsiz = uiop->uio_resid; 1261 mtx_lock(&nmp->nm_mtx); 1262 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) { 1263 mtx_unlock(&nmp->nm_mtx); 1264 return (EFBIG); 1265 } 1266 rsize = nmp->nm_rsize; 1267 mtx_unlock(&nmp->nm_mtx); 1268 while (tsiz > 0) { 1269 nfsstats.rpccnt[NFSPROC_READ]++; 1270 len = (tsiz > rsize) ? rsize : tsiz; 1271 mreq = nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1272 mb = mreq; 1273 bpos = mtod(mb, caddr_t); 1274 nfsm_fhtom(vp, v3); 1275 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3); 1276 if (v3) { 1277 txdr_hyper(uiop->uio_offset, tl); 1278 *(tl + 2) = txdr_unsigned(len); 1279 } else { 1280 *tl++ = txdr_unsigned(uiop->uio_offset); 1281 *tl++ = txdr_unsigned(len); 1282 *tl = 0; 1283 } 1284 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred); 1285 if (v3) { 1286 nfsm_postop_attr(vp, attrflag); 1287 if (error) { 1288 m_freem(mrep); 1289 goto nfsmout; 1290 } 1291 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED); 1292 eof = fxdr_unsigned(int, *(tl + 1)); 1293 } else { 1294 nfsm_loadattr(vp, NULL); 1295 } 1296 nfsm_strsiz(retlen, rsize); 1297 nfsm_mtouio(uiop, retlen); 1298 m_freem(mrep); 1299 tsiz -= retlen; 1300 if (v3) { 1301 if (eof || retlen == 0) { 1302 tsiz = 0; 1303 } 1304 } else if (retlen < len) { 1305 tsiz = 0; 1306 } 1307 } 1308 nfsmout: 1309 return (error); 1310 } 1311 1312 /* 1313 * nfs write call 1314 */ 1315 int 1316 nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1317 int *iomode, int *must_commit) 1318 { 1319 u_int32_t *tl; 1320 int32_t backup; 1321 caddr_t bpos, dpos; 1322 struct mbuf *mreq, *mrep, *md, *mb; 1323 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1324 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1325 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1326 int wsize; 1327 1328 #ifndef DIAGNOSTIC 1329 if (uiop->uio_iovcnt != 1) 1330 panic("nfs: writerpc iovcnt > 1"); 1331 #endif 1332 *must_commit = 0; 1333 tsiz = uiop->uio_resid; 1334 mtx_lock(&nmp->nm_mtx); 1335 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) { 1336 mtx_unlock(&nmp->nm_mtx); 1337 return (EFBIG); 1338 } 1339 wsize = nmp->nm_wsize; 1340 mtx_unlock(&nmp->nm_mtx); 1341 while (tsiz > 0) { 1342 nfsstats.rpccnt[NFSPROC_WRITE]++; 1343 len = (tsiz > wsize) ? wsize : tsiz; 1344 mreq = nfsm_reqhead(vp, NFSPROC_WRITE, 1345 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1346 mb = mreq; 1347 bpos = mtod(mb, caddr_t); 1348 nfsm_fhtom(vp, v3); 1349 if (v3) { 1350 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 1351 txdr_hyper(uiop->uio_offset, tl); 1352 tl += 2; 1353 *tl++ = txdr_unsigned(len); 1354 *tl++ = txdr_unsigned(*iomode); 1355 *tl = txdr_unsigned(len); 1356 } else { 1357 u_int32_t x; 1358 1359 tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED); 1360 /* Set both "begin" and "current" to non-garbage. */ 1361 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1362 *tl++ = x; /* "begin offset" */ 1363 *tl++ = x; /* "current offset" */ 1364 x = txdr_unsigned(len); 1365 *tl++ = x; /* total to this offset */ 1366 *tl = x; /* size of this write */ 1367 } 1368 nfsm_uiotom(uiop, len); 1369 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred); 1370 if (v3) { 1371 wccflag = NFSV3_WCCCHK; 1372 nfsm_wcc_data(vp, wccflag); 1373 if (!error) { 1374 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED 1375 + NFSX_V3WRITEVERF); 1376 rlen = fxdr_unsigned(int, *tl++); 1377 if (rlen == 0) { 1378 error = NFSERR_IO; 1379 m_freem(mrep); 1380 break; 1381 } else if (rlen < len) { 1382 backup = len - rlen; 1383 uiop->uio_iov->iov_base = 1384 (char *)uiop->uio_iov->iov_base - 1385 backup; 1386 uiop->uio_iov->iov_len += backup; 1387 uiop->uio_offset -= backup; 1388 uiop->uio_resid += backup; 1389 len = rlen; 1390 } 1391 commit = fxdr_unsigned(int, *tl++); 1392 1393 /* 1394 * Return the lowest committment level 1395 * obtained by any of the RPCs. 1396 */ 1397 if (committed == NFSV3WRITE_FILESYNC) 1398 committed = commit; 1399 else if (committed == NFSV3WRITE_DATASYNC && 1400 commit == NFSV3WRITE_UNSTABLE) 1401 committed = commit; 1402 mtx_lock(&nmp->nm_mtx); 1403 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1404 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1405 NFSX_V3WRITEVERF); 1406 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1407 } else if (bcmp((caddr_t)tl, 1408 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1409 *must_commit = 1; 1410 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1411 NFSX_V3WRITEVERF); 1412 } 1413 mtx_unlock(&nmp->nm_mtx); 1414 } 1415 } else { 1416 nfsm_loadattr(vp, NULL); 1417 } 1418 if (wccflag) { 1419 mtx_lock(&(VTONFS(vp))->n_mtx); 1420 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime; 1421 mtx_unlock(&(VTONFS(vp))->n_mtx); 1422 } 1423 m_freem(mrep); 1424 if (error) 1425 break; 1426 tsiz -= len; 1427 } 1428 nfsmout: 1429 if (vp->v_mount->mnt_kern_flag & MNTK_ASYNC) 1430 committed = NFSV3WRITE_FILESYNC; 1431 *iomode = committed; 1432 if (error) 1433 uiop->uio_resid = tsiz; 1434 return (error); 1435 } 1436 1437 /* 1438 * nfs mknod rpc 1439 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1440 * mode set to specify the file type and the size field for rdev. 1441 */ 1442 static int 1443 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1444 struct vattr *vap) 1445 { 1446 struct nfsv2_sattr *sp; 1447 u_int32_t *tl; 1448 struct vnode *newvp = NULL; 1449 struct nfsnode *np = NULL; 1450 struct vattr vattr; 1451 caddr_t bpos, dpos; 1452 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1453 struct mbuf *mreq, *mrep, *md, *mb; 1454 u_int32_t rdev; 1455 int v3 = NFS_ISV3(dvp); 1456 1457 if (vap->va_type == VCHR || vap->va_type == VBLK) 1458 rdev = txdr_unsigned(vap->va_rdev); 1459 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1460 rdev = nfs_xdrneg1; 1461 else { 1462 return (EOPNOTSUPP); 1463 } 1464 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 1465 return (error); 1466 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1467 mreq = nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1468 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1469 mb = mreq; 1470 bpos = mtod(mb, caddr_t); 1471 nfsm_fhtom(dvp, v3); 1472 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1473 if (v3) { 1474 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1475 *tl++ = vtonfsv3_type(vap->va_type); 1476 nfsm_v3attrbuild(vap, FALSE); 1477 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1478 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 1479 *tl++ = txdr_unsigned(major(vap->va_rdev)); 1480 *tl = txdr_unsigned(minor(vap->va_rdev)); 1481 } 1482 } else { 1483 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1484 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1485 sp->sa_uid = nfs_xdrneg1; 1486 sp->sa_gid = nfs_xdrneg1; 1487 sp->sa_size = rdev; 1488 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1489 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1490 } 1491 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred); 1492 if (!error) { 1493 nfsm_mtofh(dvp, newvp, v3, gotvp); 1494 if (!gotvp) { 1495 if (newvp) { 1496 vput(newvp); 1497 newvp = NULL; 1498 } 1499 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1500 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1501 if (!error) 1502 newvp = NFSTOV(np); 1503 } 1504 } 1505 if (v3) 1506 nfsm_wcc_data(dvp, wccflag); 1507 m_freem(mrep); 1508 nfsmout: 1509 if (error) { 1510 if (newvp) 1511 vput(newvp); 1512 } else { 1513 if (cnp->cn_flags & MAKEENTRY) 1514 cache_enter(dvp, newvp, cnp); 1515 *vpp = newvp; 1516 } 1517 mtx_lock(&(VTONFS(dvp))->n_mtx); 1518 VTONFS(dvp)->n_flag |= NMODIFIED; 1519 if (!wccflag) { 1520 VTONFS(dvp)->n_attrstamp = 0; 1521 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1522 } 1523 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1524 return (error); 1525 } 1526 1527 /* 1528 * nfs mknod vop 1529 * just call nfs_mknodrpc() to do the work. 1530 */ 1531 /* ARGSUSED */ 1532 static int 1533 nfs_mknod(struct vop_mknod_args *ap) 1534 { 1535 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1536 } 1537 1538 static u_long create_verf; 1539 /* 1540 * nfs file create call 1541 */ 1542 static int 1543 nfs_create(struct vop_create_args *ap) 1544 { 1545 struct vnode *dvp = ap->a_dvp; 1546 struct vattr *vap = ap->a_vap; 1547 struct componentname *cnp = ap->a_cnp; 1548 struct nfsv2_sattr *sp; 1549 u_int32_t *tl; 1550 struct nfsnode *np = NULL; 1551 struct vnode *newvp = NULL; 1552 caddr_t bpos, dpos; 1553 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1554 struct mbuf *mreq, *mrep, *md, *mb; 1555 struct vattr vattr; 1556 int v3 = NFS_ISV3(dvp); 1557 1558 /* 1559 * Oops, not for me.. 1560 */ 1561 if (vap->va_type == VSOCK) 1562 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1563 1564 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 1565 return (error); 1566 if (vap->va_vaflags & VA_EXCLUSIVE) 1567 fmode |= O_EXCL; 1568 again: 1569 nfsstats.rpccnt[NFSPROC_CREATE]++; 1570 mreq = nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1571 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1572 mb = mreq; 1573 bpos = mtod(mb, caddr_t); 1574 nfsm_fhtom(dvp, v3); 1575 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1576 if (v3) { 1577 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1578 if (fmode & O_EXCL) { 1579 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1580 tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF); 1581 #ifdef INET 1582 CURVNET_SET(CRED_TO_VNET(cnp->cn_cred)); 1583 IN_IFADDR_RLOCK(); 1584 if (!TAILQ_EMPTY(&V_in_ifaddrhead)) 1585 *tl++ = IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr.s_addr; 1586 else 1587 #endif 1588 *tl++ = create_verf; 1589 #ifdef INET 1590 IN_IFADDR_RUNLOCK(); 1591 CURVNET_RESTORE(); 1592 #endif 1593 *tl = ++create_verf; 1594 } else { 1595 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1596 nfsm_v3attrbuild(vap, FALSE); 1597 } 1598 } else { 1599 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1600 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1601 sp->sa_uid = nfs_xdrneg1; 1602 sp->sa_gid = nfs_xdrneg1; 1603 sp->sa_size = 0; 1604 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1605 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1606 } 1607 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred); 1608 if (!error) { 1609 nfsm_mtofh(dvp, newvp, v3, gotvp); 1610 if (!gotvp) { 1611 if (newvp) { 1612 vput(newvp); 1613 newvp = NULL; 1614 } 1615 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1616 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1617 if (!error) 1618 newvp = NFSTOV(np); 1619 } 1620 } 1621 if (v3) 1622 nfsm_wcc_data(dvp, wccflag); 1623 m_freem(mrep); 1624 nfsmout: 1625 if (error) { 1626 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1627 fmode &= ~O_EXCL; 1628 goto again; 1629 } 1630 if (newvp) 1631 vput(newvp); 1632 } else if (v3 && (fmode & O_EXCL)) { 1633 /* 1634 * We are normally called with only a partially initialized 1635 * VAP. Since the NFSv3 spec says that server may use the 1636 * file attributes to store the verifier, the spec requires 1637 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1638 * in atime, but we can't really assume that all servers will 1639 * so we ensure that our SETATTR sets both atime and mtime. 1640 */ 1641 if (vap->va_mtime.tv_sec == VNOVAL) 1642 vfs_timestamp(&vap->va_mtime); 1643 if (vap->va_atime.tv_sec == VNOVAL) 1644 vap->va_atime = vap->va_mtime; 1645 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred); 1646 if (error) 1647 vput(newvp); 1648 } 1649 if (!error) { 1650 if (cnp->cn_flags & MAKEENTRY) 1651 cache_enter(dvp, newvp, cnp); 1652 *ap->a_vpp = newvp; 1653 } 1654 mtx_lock(&(VTONFS(dvp))->n_mtx); 1655 VTONFS(dvp)->n_flag |= NMODIFIED; 1656 if (!wccflag) { 1657 VTONFS(dvp)->n_attrstamp = 0; 1658 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1659 } 1660 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1661 return (error); 1662 } 1663 1664 /* 1665 * nfs file remove call 1666 * To try and make nfs semantics closer to ufs semantics, a file that has 1667 * other processes using the vnode is renamed instead of removed and then 1668 * removed later on the last close. 1669 * - If v_usecount > 1 1670 * If a rename is not already in the works 1671 * call nfs_sillyrename() to set it up 1672 * else 1673 * do the remove rpc 1674 */ 1675 static int 1676 nfs_remove(struct vop_remove_args *ap) 1677 { 1678 struct vnode *vp = ap->a_vp; 1679 struct vnode *dvp = ap->a_dvp; 1680 struct componentname *cnp = ap->a_cnp; 1681 struct nfsnode *np = VTONFS(vp); 1682 int error = 0; 1683 struct vattr vattr; 1684 1685 #ifndef DIAGNOSTIC 1686 if ((cnp->cn_flags & HASBUF) == 0) 1687 panic("nfs_remove: no name"); 1688 if (vrefcnt(vp) < 1) 1689 panic("nfs_remove: bad v_usecount"); 1690 #endif 1691 if (vp->v_type == VDIR) 1692 error = EPERM; 1693 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1694 !VOP_GETATTR(vp, &vattr, cnp->cn_cred) && vattr.va_nlink > 1)) { 1695 /* 1696 * Purge the name cache so that the chance of a lookup for 1697 * the name succeeding while the remove is in progress is 1698 * minimized. Without node locking it can still happen, such 1699 * that an I/O op returns ESTALE, but since you get this if 1700 * another host removes the file.. 1701 */ 1702 cache_purge(vp); 1703 /* 1704 * throw away biocache buffers, mainly to avoid 1705 * unnecessary delayed writes later. 1706 */ 1707 error = nfs_vinvalbuf(vp, 0, cnp->cn_thread, 1); 1708 /* Do the rpc */ 1709 if (error != EINTR && error != EIO) 1710 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1711 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1712 /* 1713 * Kludge City: If the first reply to the remove rpc is lost.. 1714 * the reply to the retransmitted request will be ENOENT 1715 * since the file was in fact removed 1716 * Therefore, we cheat and return success. 1717 */ 1718 if (error == ENOENT) 1719 error = 0; 1720 } else if (!np->n_sillyrename) 1721 error = nfs_sillyrename(dvp, vp, cnp); 1722 np->n_attrstamp = 0; 1723 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1724 return (error); 1725 } 1726 1727 /* 1728 * nfs file remove rpc called from nfs_inactive 1729 */ 1730 int 1731 nfs_removeit(struct sillyrename *sp) 1732 { 1733 /* 1734 * Make sure that the directory vnode is still valid. 1735 * XXX we should lock sp->s_dvp here. 1736 */ 1737 if (sp->s_dvp->v_type == VBAD) 1738 return (0); 1739 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1740 NULL)); 1741 } 1742 1743 /* 1744 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1745 */ 1746 static int 1747 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1748 struct ucred *cred, struct thread *td) 1749 { 1750 caddr_t bpos, dpos; 1751 int error = 0, wccflag = NFSV3_WCCRATTR; 1752 struct mbuf *mreq, *mrep, *md, *mb; 1753 int v3 = NFS_ISV3(dvp); 1754 1755 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1756 mreq = nfsm_reqhead(dvp, NFSPROC_REMOVE, 1757 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1758 mb = mreq; 1759 bpos = mtod(mb, caddr_t); 1760 nfsm_fhtom(dvp, v3); 1761 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1762 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1763 if (v3) 1764 nfsm_wcc_data(dvp, wccflag); 1765 m_freem(mrep); 1766 nfsmout: 1767 mtx_lock(&(VTONFS(dvp))->n_mtx); 1768 VTONFS(dvp)->n_flag |= NMODIFIED; 1769 if (!wccflag) { 1770 VTONFS(dvp)->n_attrstamp = 0; 1771 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 1772 } 1773 mtx_unlock(&(VTONFS(dvp))->n_mtx); 1774 return (error); 1775 } 1776 1777 /* 1778 * nfs file rename call 1779 */ 1780 static int 1781 nfs_rename(struct vop_rename_args *ap) 1782 { 1783 struct vnode *fvp = ap->a_fvp; 1784 struct vnode *tvp = ap->a_tvp; 1785 struct vnode *fdvp = ap->a_fdvp; 1786 struct vnode *tdvp = ap->a_tdvp; 1787 struct componentname *tcnp = ap->a_tcnp; 1788 struct componentname *fcnp = ap->a_fcnp; 1789 int error; 1790 1791 #ifndef DIAGNOSTIC 1792 if ((tcnp->cn_flags & HASBUF) == 0 || 1793 (fcnp->cn_flags & HASBUF) == 0) 1794 panic("nfs_rename: no name"); 1795 #endif 1796 /* Check for cross-device rename */ 1797 if ((fvp->v_mount != tdvp->v_mount) || 1798 (tvp && (fvp->v_mount != tvp->v_mount))) { 1799 error = EXDEV; 1800 goto out; 1801 } 1802 1803 if (fvp == tvp) { 1804 nfs_printf("nfs_rename: fvp == tvp (can't happen)\n"); 1805 error = 0; 1806 goto out; 1807 } 1808 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) 1809 goto out; 1810 1811 /* 1812 * We have to flush B_DELWRI data prior to renaming 1813 * the file. If we don't, the delayed-write buffers 1814 * can be flushed out later after the file has gone stale 1815 * under NFSV3. NFSV2 does not have this problem because 1816 * ( as far as I can tell ) it flushes dirty buffers more 1817 * often. 1818 * 1819 * Skip the rename operation if the fsync fails, this can happen 1820 * due to the server's volume being full, when we pushed out data 1821 * that was written back to our cache earlier. Not checking for 1822 * this condition can result in potential (silent) data loss. 1823 */ 1824 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread); 1825 VOP_UNLOCK(fvp, 0); 1826 if (!error && tvp) 1827 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread); 1828 if (error) 1829 goto out; 1830 1831 /* 1832 * If the tvp exists and is in use, sillyrename it before doing the 1833 * rename of the new file over it. 1834 * XXX Can't sillyrename a directory. 1835 */ 1836 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1837 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1838 vput(tvp); 1839 tvp = NULL; 1840 } 1841 1842 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1843 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1844 tcnp->cn_thread); 1845 1846 if (fvp->v_type == VDIR) { 1847 if (tvp != NULL && tvp->v_type == VDIR) 1848 cache_purge(tdvp); 1849 cache_purge(fdvp); 1850 } 1851 1852 out: 1853 if (tdvp == tvp) 1854 vrele(tdvp); 1855 else 1856 vput(tdvp); 1857 if (tvp) 1858 vput(tvp); 1859 vrele(fdvp); 1860 vrele(fvp); 1861 /* 1862 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1863 */ 1864 if (error == ENOENT) 1865 error = 0; 1866 return (error); 1867 } 1868 1869 /* 1870 * nfs file rename rpc called from nfs_remove() above 1871 */ 1872 static int 1873 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 1874 struct sillyrename *sp) 1875 { 1876 1877 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp, 1878 sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread)); 1879 } 1880 1881 /* 1882 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1883 */ 1884 static int 1885 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 1886 struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred, 1887 struct thread *td) 1888 { 1889 caddr_t bpos, dpos; 1890 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1891 struct mbuf *mreq, *mrep, *md, *mb; 1892 int v3 = NFS_ISV3(fdvp); 1893 1894 nfsstats.rpccnt[NFSPROC_RENAME]++; 1895 mreq = nfsm_reqhead(fdvp, NFSPROC_RENAME, 1896 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1897 nfsm_rndup(tnamelen)); 1898 mb = mreq; 1899 bpos = mtod(mb, caddr_t); 1900 nfsm_fhtom(fdvp, v3); 1901 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1902 nfsm_fhtom(tdvp, v3); 1903 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1904 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1905 if (v3) { 1906 nfsm_wcc_data(fdvp, fwccflag); 1907 nfsm_wcc_data(tdvp, twccflag); 1908 } 1909 m_freem(mrep); 1910 nfsmout: 1911 mtx_lock(&(VTONFS(fdvp))->n_mtx); 1912 VTONFS(fdvp)->n_flag |= NMODIFIED; 1913 mtx_unlock(&(VTONFS(fdvp))->n_mtx); 1914 mtx_lock(&(VTONFS(tdvp))->n_mtx); 1915 VTONFS(tdvp)->n_flag |= NMODIFIED; 1916 mtx_unlock(&(VTONFS(tdvp))->n_mtx); 1917 if (!fwccflag) { 1918 VTONFS(fdvp)->n_attrstamp = 0; 1919 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); 1920 } 1921 if (!twccflag) { 1922 VTONFS(tdvp)->n_attrstamp = 0; 1923 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 1924 } 1925 return (error); 1926 } 1927 1928 /* 1929 * nfs hard link create call 1930 */ 1931 static int 1932 nfs_link(struct vop_link_args *ap) 1933 { 1934 struct vnode *vp = ap->a_vp; 1935 struct vnode *tdvp = ap->a_tdvp; 1936 struct componentname *cnp = ap->a_cnp; 1937 caddr_t bpos, dpos; 1938 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1939 struct mbuf *mreq, *mrep, *md, *mb; 1940 int v3; 1941 1942 if (vp->v_mount != tdvp->v_mount) { 1943 return (EXDEV); 1944 } 1945 1946 /* 1947 * Push all writes to the server, so that the attribute cache 1948 * doesn't get "out of sync" with the server. 1949 * XXX There should be a better way! 1950 */ 1951 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread); 1952 1953 v3 = NFS_ISV3(vp); 1954 nfsstats.rpccnt[NFSPROC_LINK]++; 1955 mreq = nfsm_reqhead(vp, NFSPROC_LINK, 1956 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1957 mb = mreq; 1958 bpos = mtod(mb, caddr_t); 1959 nfsm_fhtom(vp, v3); 1960 nfsm_fhtom(tdvp, v3); 1961 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1962 nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred); 1963 if (v3) { 1964 nfsm_postop_attr(vp, attrflag); 1965 nfsm_wcc_data(tdvp, wccflag); 1966 } 1967 m_freem(mrep); 1968 nfsmout: 1969 mtx_lock(&(VTONFS(tdvp))->n_mtx); 1970 VTONFS(tdvp)->n_flag |= NMODIFIED; 1971 mtx_unlock(&(VTONFS(tdvp))->n_mtx); 1972 if (!attrflag) { 1973 VTONFS(vp)->n_attrstamp = 0; 1974 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1975 } 1976 if (!wccflag) { 1977 VTONFS(tdvp)->n_attrstamp = 0; 1978 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); 1979 } 1980 return (error); 1981 } 1982 1983 /* 1984 * nfs symbolic link create call 1985 */ 1986 static int 1987 nfs_symlink(struct vop_symlink_args *ap) 1988 { 1989 struct vnode *dvp = ap->a_dvp; 1990 struct vattr *vap = ap->a_vap; 1991 struct componentname *cnp = ap->a_cnp; 1992 struct nfsv2_sattr *sp; 1993 caddr_t bpos, dpos; 1994 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 1995 struct mbuf *mreq, *mrep, *md, *mb; 1996 struct vnode *newvp = NULL; 1997 int v3 = NFS_ISV3(dvp); 1998 1999 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 2000 slen = strlen(ap->a_target); 2001 mreq = nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 2002 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 2003 mb = mreq; 2004 bpos = mtod(mb, caddr_t); 2005 nfsm_fhtom(dvp, v3); 2006 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2007 if (v3) { 2008 nfsm_v3attrbuild(vap, FALSE); 2009 } 2010 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 2011 if (!v3) { 2012 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 2013 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 2014 sp->sa_uid = nfs_xdrneg1; 2015 sp->sa_gid = nfs_xdrneg1; 2016 sp->sa_size = nfs_xdrneg1; 2017 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2018 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2019 } 2020 2021 /* 2022 * Issue the NFS request and get the rpc response. 2023 * 2024 * Only NFSv3 responses returning an error of 0 actually return 2025 * a file handle that can be converted into newvp without having 2026 * to do an extra lookup rpc. 2027 */ 2028 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred); 2029 if (v3) { 2030 if (error == 0) 2031 nfsm_mtofh(dvp, newvp, v3, gotvp); 2032 nfsm_wcc_data(dvp, wccflag); 2033 } 2034 2035 /* 2036 * out code jumps -> here, mrep is also freed. 2037 */ 2038 2039 m_freem(mrep); 2040 nfsmout: 2041 2042 /* 2043 * If we do not have an error and we could not extract the newvp from 2044 * the response due to the request being NFSv2, we have to do a 2045 * lookup in order to obtain a newvp to return. 2046 */ 2047 if (error == 0 && newvp == NULL) { 2048 struct nfsnode *np = NULL; 2049 2050 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2051 cnp->cn_cred, cnp->cn_thread, &np); 2052 if (!error) 2053 newvp = NFSTOV(np); 2054 } 2055 if (error) { 2056 if (newvp) 2057 vput(newvp); 2058 } else { 2059 *ap->a_vpp = newvp; 2060 } 2061 mtx_lock(&(VTONFS(dvp))->n_mtx); 2062 VTONFS(dvp)->n_flag |= NMODIFIED; 2063 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2064 if (!wccflag) { 2065 VTONFS(dvp)->n_attrstamp = 0; 2066 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2067 } 2068 return (error); 2069 } 2070 2071 /* 2072 * nfs make dir call 2073 */ 2074 static int 2075 nfs_mkdir(struct vop_mkdir_args *ap) 2076 { 2077 struct vnode *dvp = ap->a_dvp; 2078 struct vattr *vap = ap->a_vap; 2079 struct componentname *cnp = ap->a_cnp; 2080 struct nfsv2_sattr *sp; 2081 int len; 2082 struct nfsnode *np = NULL; 2083 struct vnode *newvp = NULL; 2084 caddr_t bpos, dpos; 2085 int error = 0, wccflag = NFSV3_WCCRATTR; 2086 int gotvp = 0; 2087 struct mbuf *mreq, *mrep, *md, *mb; 2088 struct vattr vattr; 2089 int v3 = NFS_ISV3(dvp); 2090 2091 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) 2092 return (error); 2093 len = cnp->cn_namelen; 2094 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2095 mreq = nfsm_reqhead(dvp, NFSPROC_MKDIR, 2096 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 2097 mb = mreq; 2098 bpos = mtod(mb, caddr_t); 2099 nfsm_fhtom(dvp, v3); 2100 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 2101 if (v3) { 2102 nfsm_v3attrbuild(vap, FALSE); 2103 } else { 2104 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 2105 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2106 sp->sa_uid = nfs_xdrneg1; 2107 sp->sa_gid = nfs_xdrneg1; 2108 sp->sa_size = nfs_xdrneg1; 2109 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2110 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2111 } 2112 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred); 2113 if (!error) 2114 nfsm_mtofh(dvp, newvp, v3, gotvp); 2115 if (v3) 2116 nfsm_wcc_data(dvp, wccflag); 2117 m_freem(mrep); 2118 nfsmout: 2119 mtx_lock(&(VTONFS(dvp))->n_mtx); 2120 VTONFS(dvp)->n_flag |= NMODIFIED; 2121 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2122 if (!wccflag) { 2123 VTONFS(dvp)->n_attrstamp = 0; 2124 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2125 } 2126 if (error == 0 && newvp == NULL) { 2127 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2128 cnp->cn_thread, &np); 2129 if (!error) { 2130 newvp = NFSTOV(np); 2131 if (newvp->v_type != VDIR) 2132 error = EEXIST; 2133 } 2134 } 2135 if (error) { 2136 if (newvp) 2137 vput(newvp); 2138 } else 2139 *ap->a_vpp = newvp; 2140 return (error); 2141 } 2142 2143 /* 2144 * nfs remove directory call 2145 */ 2146 static int 2147 nfs_rmdir(struct vop_rmdir_args *ap) 2148 { 2149 struct vnode *vp = ap->a_vp; 2150 struct vnode *dvp = ap->a_dvp; 2151 struct componentname *cnp = ap->a_cnp; 2152 caddr_t bpos, dpos; 2153 int error = 0, wccflag = NFSV3_WCCRATTR; 2154 struct mbuf *mreq, *mrep, *md, *mb; 2155 int v3 = NFS_ISV3(dvp); 2156 2157 if (dvp == vp) 2158 return (EINVAL); 2159 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2160 mreq = nfsm_reqhead(dvp, NFSPROC_RMDIR, 2161 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2162 mb = mreq; 2163 bpos = mtod(mb, caddr_t); 2164 nfsm_fhtom(dvp, v3); 2165 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2166 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred); 2167 if (v3) 2168 nfsm_wcc_data(dvp, wccflag); 2169 m_freem(mrep); 2170 nfsmout: 2171 mtx_lock(&(VTONFS(dvp))->n_mtx); 2172 VTONFS(dvp)->n_flag |= NMODIFIED; 2173 mtx_unlock(&(VTONFS(dvp))->n_mtx); 2174 if (!wccflag) { 2175 VTONFS(dvp)->n_attrstamp = 0; 2176 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); 2177 } 2178 cache_purge(dvp); 2179 cache_purge(vp); 2180 /* 2181 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2182 */ 2183 if (error == ENOENT) 2184 error = 0; 2185 return (error); 2186 } 2187 2188 /* 2189 * nfs readdir call 2190 */ 2191 static int 2192 nfs_readdir(struct vop_readdir_args *ap) 2193 { 2194 struct vnode *vp = ap->a_vp; 2195 struct nfsnode *np = VTONFS(vp); 2196 struct uio *uio = ap->a_uio; 2197 int tresid, error = 0; 2198 struct vattr vattr; 2199 2200 if (vp->v_type != VDIR) 2201 return(EPERM); 2202 2203 /* 2204 * First, check for hit on the EOF offset cache 2205 */ 2206 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2207 (np->n_flag & NMODIFIED) == 0) { 2208 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { 2209 mtx_lock(&np->n_mtx); 2210 if (!NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 2211 mtx_unlock(&np->n_mtx); 2212 nfsstats.direofcache_hits++; 2213 goto out; 2214 } else 2215 mtx_unlock(&np->n_mtx); 2216 } 2217 } 2218 2219 /* 2220 * Call nfs_bioread() to do the real work. 2221 */ 2222 tresid = uio->uio_resid; 2223 error = nfs_bioread(vp, uio, 0, ap->a_cred); 2224 2225 if (!error && uio->uio_resid == tresid) { 2226 nfsstats.direofcache_misses++; 2227 } 2228 out: 2229 return (error); 2230 } 2231 2232 /* 2233 * Readdir rpc call. 2234 * Called from below the buffer cache by nfs_doio(). 2235 */ 2236 int 2237 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2238 { 2239 int len, left; 2240 struct dirent *dp = NULL; 2241 u_int32_t *tl; 2242 caddr_t cp; 2243 nfsuint64 *cookiep; 2244 caddr_t bpos, dpos; 2245 struct mbuf *mreq, *mrep, *md, *mb; 2246 nfsuint64 cookie; 2247 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2248 struct nfsnode *dnp = VTONFS(vp); 2249 u_quad_t fileno; 2250 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2251 int attrflag; 2252 int v3 = NFS_ISV3(vp); 2253 2254 #ifndef DIAGNOSTIC 2255 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2256 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2257 panic("nfs readdirrpc bad uio"); 2258 #endif 2259 2260 /* 2261 * If there is no cookie, assume directory was stale. 2262 */ 2263 nfs_dircookie_lock(dnp); 2264 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2265 if (cookiep) { 2266 cookie = *cookiep; 2267 nfs_dircookie_unlock(dnp); 2268 } else { 2269 nfs_dircookie_unlock(dnp); 2270 return (NFSERR_BAD_COOKIE); 2271 } 2272 2273 /* 2274 * Loop around doing readdir rpc's of size nm_readdirsize 2275 * truncated to a multiple of DIRBLKSIZ. 2276 * The stopping criteria is EOF or buffer full. 2277 */ 2278 while (more_dirs && bigenough) { 2279 nfsstats.rpccnt[NFSPROC_READDIR]++; 2280 mreq = nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 2281 NFSX_READDIR(v3)); 2282 mb = mreq; 2283 bpos = mtod(mb, caddr_t); 2284 nfsm_fhtom(vp, v3); 2285 if (v3) { 2286 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 2287 *tl++ = cookie.nfsuquad[0]; 2288 *tl++ = cookie.nfsuquad[1]; 2289 mtx_lock(&dnp->n_mtx); 2290 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2291 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2292 mtx_unlock(&dnp->n_mtx); 2293 } else { 2294 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 2295 *tl++ = cookie.nfsuquad[0]; 2296 } 2297 *tl = txdr_unsigned(nmp->nm_readdirsize); 2298 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred); 2299 if (v3) { 2300 nfsm_postop_attr(vp, attrflag); 2301 if (!error) { 2302 tl = nfsm_dissect(u_int32_t *, 2303 2 * NFSX_UNSIGNED); 2304 mtx_lock(&dnp->n_mtx); 2305 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2306 dnp->n_cookieverf.nfsuquad[1] = *tl; 2307 mtx_unlock(&dnp->n_mtx); 2308 } else { 2309 m_freem(mrep); 2310 goto nfsmout; 2311 } 2312 } 2313 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2314 more_dirs = fxdr_unsigned(int, *tl); 2315 2316 /* loop thru the dir entries, doctoring them to 4bsd form */ 2317 while (more_dirs && bigenough) { 2318 if (v3) { 2319 tl = nfsm_dissect(u_int32_t *, 2320 3 * NFSX_UNSIGNED); 2321 fileno = fxdr_hyper(tl); 2322 len = fxdr_unsigned(int, *(tl + 2)); 2323 } else { 2324 tl = nfsm_dissect(u_int32_t *, 2325 2 * NFSX_UNSIGNED); 2326 fileno = fxdr_unsigned(u_quad_t, *tl++); 2327 len = fxdr_unsigned(int, *tl); 2328 } 2329 if (len <= 0 || len > NFS_MAXNAMLEN) { 2330 error = EBADRPC; 2331 m_freem(mrep); 2332 goto nfsmout; 2333 } 2334 tlen = nfsm_rndup(len); 2335 if (tlen == len) 2336 tlen += 4; /* To ensure null termination */ 2337 left = DIRBLKSIZ - blksiz; 2338 if ((tlen + DIRHDSIZ) > left) { 2339 dp->d_reclen += left; 2340 uiop->uio_iov->iov_base = 2341 (char *)uiop->uio_iov->iov_base + left; 2342 uiop->uio_iov->iov_len -= left; 2343 uiop->uio_offset += left; 2344 uiop->uio_resid -= left; 2345 blksiz = 0; 2346 } 2347 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2348 bigenough = 0; 2349 if (bigenough) { 2350 dp = (struct dirent *)uiop->uio_iov->iov_base; 2351 dp->d_fileno = (int)fileno; 2352 dp->d_namlen = len; 2353 dp->d_reclen = tlen + DIRHDSIZ; 2354 dp->d_type = DT_UNKNOWN; 2355 blksiz += dp->d_reclen; 2356 if (blksiz == DIRBLKSIZ) 2357 blksiz = 0; 2358 uiop->uio_offset += DIRHDSIZ; 2359 uiop->uio_resid -= DIRHDSIZ; 2360 uiop->uio_iov->iov_base = 2361 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2362 uiop->uio_iov->iov_len -= DIRHDSIZ; 2363 nfsm_mtouio(uiop, len); 2364 cp = uiop->uio_iov->iov_base; 2365 tlen -= len; 2366 *cp = '\0'; /* null terminate */ 2367 uiop->uio_iov->iov_base = 2368 (char *)uiop->uio_iov->iov_base + tlen; 2369 uiop->uio_iov->iov_len -= tlen; 2370 uiop->uio_offset += tlen; 2371 uiop->uio_resid -= tlen; 2372 } else 2373 nfsm_adv(nfsm_rndup(len)); 2374 if (v3) { 2375 tl = nfsm_dissect(u_int32_t *, 2376 3 * NFSX_UNSIGNED); 2377 } else { 2378 tl = nfsm_dissect(u_int32_t *, 2379 2 * NFSX_UNSIGNED); 2380 } 2381 if (bigenough) { 2382 cookie.nfsuquad[0] = *tl++; 2383 if (v3) 2384 cookie.nfsuquad[1] = *tl++; 2385 } else if (v3) 2386 tl += 2; 2387 else 2388 tl++; 2389 more_dirs = fxdr_unsigned(int, *tl); 2390 } 2391 /* 2392 * If at end of rpc data, get the eof boolean 2393 */ 2394 if (!more_dirs) { 2395 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2396 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2397 } 2398 m_freem(mrep); 2399 } 2400 /* 2401 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2402 * by increasing d_reclen for the last record. 2403 */ 2404 if (blksiz > 0) { 2405 left = DIRBLKSIZ - blksiz; 2406 dp->d_reclen += left; 2407 uiop->uio_iov->iov_base = 2408 (char *)uiop->uio_iov->iov_base + left; 2409 uiop->uio_iov->iov_len -= left; 2410 uiop->uio_offset += left; 2411 uiop->uio_resid -= left; 2412 } 2413 2414 /* 2415 * We are now either at the end of the directory or have filled the 2416 * block. 2417 */ 2418 if (bigenough) 2419 dnp->n_direofoffset = uiop->uio_offset; 2420 else { 2421 if (uiop->uio_resid > 0) 2422 nfs_printf("EEK! readdirrpc resid > 0\n"); 2423 nfs_dircookie_lock(dnp); 2424 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2425 *cookiep = cookie; 2426 nfs_dircookie_unlock(dnp); 2427 } 2428 nfsmout: 2429 return (error); 2430 } 2431 2432 /* 2433 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2434 */ 2435 int 2436 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2437 { 2438 int len, left; 2439 struct dirent *dp; 2440 u_int32_t *tl; 2441 caddr_t cp; 2442 struct vnode *newvp; 2443 nfsuint64 *cookiep; 2444 caddr_t bpos, dpos, dpossav1, dpossav2; 2445 struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2; 2446 struct nameidata nami, *ndp = &nami; 2447 struct componentname *cnp = &ndp->ni_cnd; 2448 nfsuint64 cookie; 2449 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2450 struct nfsnode *dnp = VTONFS(vp), *np; 2451 nfsfh_t *fhp; 2452 u_quad_t fileno; 2453 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2454 int attrflag, fhsize; 2455 2456 #ifndef nolint 2457 dp = NULL; 2458 #endif 2459 #ifndef DIAGNOSTIC 2460 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2461 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2462 panic("nfs readdirplusrpc bad uio"); 2463 #endif 2464 ndp->ni_dvp = vp; 2465 newvp = NULLVP; 2466 2467 /* 2468 * If there is no cookie, assume directory was stale. 2469 */ 2470 nfs_dircookie_lock(dnp); 2471 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2472 if (cookiep) { 2473 cookie = *cookiep; 2474 nfs_dircookie_unlock(dnp); 2475 } else { 2476 nfs_dircookie_unlock(dnp); 2477 return (NFSERR_BAD_COOKIE); 2478 } 2479 /* 2480 * Loop around doing readdir rpc's of size nm_readdirsize 2481 * truncated to a multiple of DIRBLKSIZ. 2482 * The stopping criteria is EOF or buffer full. 2483 */ 2484 while (more_dirs && bigenough) { 2485 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2486 mreq = nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2487 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2488 mb = mreq; 2489 bpos = mtod(mb, caddr_t); 2490 nfsm_fhtom(vp, 1); 2491 tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED); 2492 *tl++ = cookie.nfsuquad[0]; 2493 *tl++ = cookie.nfsuquad[1]; 2494 mtx_lock(&dnp->n_mtx); 2495 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2496 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2497 mtx_unlock(&dnp->n_mtx); 2498 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2499 *tl = txdr_unsigned(nmp->nm_rsize); 2500 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred); 2501 nfsm_postop_attr(vp, attrflag); 2502 if (error) { 2503 m_freem(mrep); 2504 goto nfsmout; 2505 } 2506 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2507 mtx_lock(&dnp->n_mtx); 2508 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2509 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2510 mtx_unlock(&dnp->n_mtx); 2511 more_dirs = fxdr_unsigned(int, *tl); 2512 2513 /* loop thru the dir entries, doctoring them to 4bsd form */ 2514 while (more_dirs && bigenough) { 2515 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2516 fileno = fxdr_hyper(tl); 2517 len = fxdr_unsigned(int, *(tl + 2)); 2518 if (len <= 0 || len > NFS_MAXNAMLEN) { 2519 error = EBADRPC; 2520 m_freem(mrep); 2521 goto nfsmout; 2522 } 2523 tlen = nfsm_rndup(len); 2524 if (tlen == len) 2525 tlen += 4; /* To ensure null termination*/ 2526 left = DIRBLKSIZ - blksiz; 2527 if ((tlen + DIRHDSIZ) > left) { 2528 dp->d_reclen += left; 2529 uiop->uio_iov->iov_base = 2530 (char *)uiop->uio_iov->iov_base + left; 2531 uiop->uio_iov->iov_len -= left; 2532 uiop->uio_offset += left; 2533 uiop->uio_resid -= left; 2534 blksiz = 0; 2535 } 2536 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2537 bigenough = 0; 2538 if (bigenough) { 2539 dp = (struct dirent *)uiop->uio_iov->iov_base; 2540 dp->d_fileno = (int)fileno; 2541 dp->d_namlen = len; 2542 dp->d_reclen = tlen + DIRHDSIZ; 2543 dp->d_type = DT_UNKNOWN; 2544 blksiz += dp->d_reclen; 2545 if (blksiz == DIRBLKSIZ) 2546 blksiz = 0; 2547 uiop->uio_offset += DIRHDSIZ; 2548 uiop->uio_resid -= DIRHDSIZ; 2549 uiop->uio_iov->iov_base = 2550 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2551 uiop->uio_iov->iov_len -= DIRHDSIZ; 2552 cnp->cn_nameptr = uiop->uio_iov->iov_base; 2553 cnp->cn_namelen = len; 2554 nfsm_mtouio(uiop, len); 2555 cp = uiop->uio_iov->iov_base; 2556 tlen -= len; 2557 *cp = '\0'; 2558 uiop->uio_iov->iov_base = 2559 (char *)uiop->uio_iov->iov_base + tlen; 2560 uiop->uio_iov->iov_len -= tlen; 2561 uiop->uio_offset += tlen; 2562 uiop->uio_resid -= tlen; 2563 } else 2564 nfsm_adv(nfsm_rndup(len)); 2565 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2566 if (bigenough) { 2567 cookie.nfsuquad[0] = *tl++; 2568 cookie.nfsuquad[1] = *tl++; 2569 } else 2570 tl += 2; 2571 2572 /* 2573 * Since the attributes are before the file handle 2574 * (sigh), we must skip over the attributes and then 2575 * come back and get them. 2576 */ 2577 attrflag = fxdr_unsigned(int, *tl); 2578 if (attrflag) { 2579 dpossav1 = dpos; 2580 mdsav1 = md; 2581 nfsm_adv(NFSX_V3FATTR); 2582 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2583 doit = fxdr_unsigned(int, *tl); 2584 /* 2585 * Skip loading the attrs for "..". There's a 2586 * race between loading the attrs here and 2587 * lookups that look for the directory currently 2588 * being read (in the parent). We try to acquire 2589 * the exclusive lock on ".." here, owning the 2590 * lock on the directory being read. Lookup will 2591 * hold the lock on ".." and try to acquire the 2592 * lock on the directory being read. 2593 * 2594 * There are other ways of fixing this, one would 2595 * be to do a trylock on the ".." vnode and skip 2596 * loading the attrs on ".." if it happens to be 2597 * locked by another process. But skipping the 2598 * attrload on ".." seems the easiest option. 2599 */ 2600 if (strcmp(dp->d_name, "..") == 0) { 2601 doit = 0; 2602 /* 2603 * We've already skipped over the attrs, 2604 * skip over the filehandle. And store d_type 2605 * as VDIR. 2606 */ 2607 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2608 i = fxdr_unsigned(int, *tl); 2609 nfsm_adv(nfsm_rndup(i)); 2610 dp->d_type = IFTODT(VTTOIF(VDIR)); 2611 } 2612 if (doit) { 2613 nfsm_getfh(fhp, fhsize, 1); 2614 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2615 VREF(vp); 2616 newvp = vp; 2617 np = dnp; 2618 } else { 2619 error = nfs_nget(vp->v_mount, fhp, 2620 fhsize, &np, LK_EXCLUSIVE); 2621 if (error) 2622 doit = 0; 2623 else 2624 newvp = NFSTOV(np); 2625 } 2626 } 2627 if (doit && bigenough) { 2628 dpossav2 = dpos; 2629 dpos = dpossav1; 2630 mdsav2 = md; 2631 md = mdsav1; 2632 nfsm_loadattr(newvp, NULL); 2633 dpos = dpossav2; 2634 md = mdsav2; 2635 dp->d_type = 2636 IFTODT(VTTOIF(np->n_vattr.va_type)); 2637 ndp->ni_vp = newvp; 2638 /* Update n_ctime, so subsequent lookup doesn't purge entry */ 2639 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 2640 cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp); 2641 } 2642 } else { 2643 /* Just skip over the file handle */ 2644 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2645 i = fxdr_unsigned(int, *tl); 2646 if (i) { 2647 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2648 fhsize = fxdr_unsigned(int, *tl); 2649 nfsm_adv(nfsm_rndup(fhsize)); 2650 } 2651 } 2652 if (newvp != NULLVP) { 2653 if (newvp == vp) 2654 vrele(newvp); 2655 else 2656 vput(newvp); 2657 newvp = NULLVP; 2658 } 2659 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2660 more_dirs = fxdr_unsigned(int, *tl); 2661 } 2662 /* 2663 * If at end of rpc data, get the eof boolean 2664 */ 2665 if (!more_dirs) { 2666 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2667 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2668 } 2669 m_freem(mrep); 2670 } 2671 /* 2672 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2673 * by increasing d_reclen for the last record. 2674 */ 2675 if (blksiz > 0) { 2676 left = DIRBLKSIZ - blksiz; 2677 dp->d_reclen += left; 2678 uiop->uio_iov->iov_base = 2679 (char *)uiop->uio_iov->iov_base + left; 2680 uiop->uio_iov->iov_len -= left; 2681 uiop->uio_offset += left; 2682 uiop->uio_resid -= left; 2683 } 2684 2685 /* 2686 * We are now either at the end of the directory or have filled the 2687 * block. 2688 */ 2689 if (bigenough) 2690 dnp->n_direofoffset = uiop->uio_offset; 2691 else { 2692 if (uiop->uio_resid > 0) 2693 nfs_printf("EEK! readdirplusrpc resid > 0\n"); 2694 nfs_dircookie_lock(dnp); 2695 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2696 *cookiep = cookie; 2697 nfs_dircookie_unlock(dnp); 2698 } 2699 nfsmout: 2700 if (newvp != NULLVP) { 2701 if (newvp == vp) 2702 vrele(newvp); 2703 else 2704 vput(newvp); 2705 newvp = NULLVP; 2706 } 2707 return (error); 2708 } 2709 2710 /* 2711 * Silly rename. To make the NFS filesystem that is stateless look a little 2712 * more like the "ufs" a remove of an active vnode is translated to a rename 2713 * to a funny looking filename that is removed by nfs_inactive on the 2714 * nfsnode. There is the potential for another process on a different client 2715 * to create the same funny name between the nfs_lookitup() fails and the 2716 * nfs_rename() completes, but... 2717 */ 2718 static int 2719 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2720 { 2721 struct sillyrename *sp; 2722 struct nfsnode *np; 2723 int error; 2724 short pid; 2725 unsigned int lticks; 2726 2727 cache_purge(dvp); 2728 np = VTONFS(vp); 2729 #ifndef DIAGNOSTIC 2730 if (vp->v_type == VDIR) 2731 panic("nfs: sillyrename dir"); 2732 #endif 2733 sp = malloc(sizeof (struct sillyrename), 2734 M_NFSREQ, M_WAITOK); 2735 sp->s_cred = crhold(cnp->cn_cred); 2736 sp->s_dvp = dvp; 2737 sp->s_removeit = nfs_removeit; 2738 VREF(dvp); 2739 2740 /* 2741 * Fudge together a funny name. 2742 * Changing the format of the funny name to accomodate more 2743 * sillynames per directory. 2744 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2745 * CPU ticks since boot. 2746 */ 2747 pid = cnp->cn_thread->td_proc->p_pid; 2748 lticks = (unsigned int)ticks; 2749 for ( ; ; ) { 2750 sp->s_namlen = sprintf(sp->s_name, 2751 ".nfs.%08x.%04x4.4", lticks, 2752 pid); 2753 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2754 cnp->cn_thread, NULL)) 2755 break; 2756 lticks++; 2757 } 2758 error = nfs_renameit(dvp, cnp, sp); 2759 if (error) 2760 goto bad; 2761 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2762 cnp->cn_thread, &np); 2763 np->n_sillyrename = sp; 2764 return (0); 2765 bad: 2766 vrele(sp->s_dvp); 2767 crfree(sp->s_cred); 2768 free((caddr_t)sp, M_NFSREQ); 2769 return (error); 2770 } 2771 2772 /* 2773 * Look up a file name and optionally either update the file handle or 2774 * allocate an nfsnode, depending on the value of npp. 2775 * npp == NULL --> just do the lookup 2776 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2777 * handled too 2778 * *npp != NULL --> update the file handle in the vnode 2779 */ 2780 static int 2781 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2782 struct thread *td, struct nfsnode **npp) 2783 { 2784 struct vnode *newvp = NULL; 2785 struct nfsnode *np, *dnp = VTONFS(dvp); 2786 caddr_t bpos, dpos; 2787 int error = 0, fhlen, attrflag; 2788 struct mbuf *mreq, *mrep, *md, *mb; 2789 nfsfh_t *nfhp; 2790 int v3 = NFS_ISV3(dvp); 2791 2792 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2793 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2794 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2795 mb = mreq; 2796 bpos = mtod(mb, caddr_t); 2797 nfsm_fhtom(dvp, v3); 2798 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2799 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2800 if (npp && !error) { 2801 nfsm_getfh(nfhp, fhlen, v3); 2802 if (*npp) { 2803 np = *npp; 2804 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2805 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2806 np->n_fhp = &np->n_fh; 2807 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2808 np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK); 2809 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2810 np->n_fhsize = fhlen; 2811 newvp = NFSTOV(np); 2812 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2813 VREF(dvp); 2814 newvp = dvp; 2815 } else { 2816 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, LK_EXCLUSIVE); 2817 if (error) { 2818 m_freem(mrep); 2819 return (error); 2820 } 2821 newvp = NFSTOV(np); 2822 } 2823 if (v3) { 2824 nfsm_postop_attr(newvp, attrflag); 2825 if (!attrflag && *npp == NULL) { 2826 m_freem(mrep); 2827 if (newvp == dvp) 2828 vrele(newvp); 2829 else 2830 vput(newvp); 2831 return (ENOENT); 2832 } 2833 } else 2834 nfsm_loadattr(newvp, NULL); 2835 } 2836 m_freem(mrep); 2837 nfsmout: 2838 if (npp && *npp == NULL) { 2839 if (error) { 2840 if (newvp) { 2841 if (newvp == dvp) 2842 vrele(newvp); 2843 else 2844 vput(newvp); 2845 } 2846 } else 2847 *npp = np; 2848 } 2849 return (error); 2850 } 2851 2852 /* 2853 * Nfs Version 3 commit rpc 2854 */ 2855 int 2856 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2857 struct thread *td) 2858 { 2859 u_int32_t *tl; 2860 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2861 caddr_t bpos, dpos; 2862 int error = 0, wccflag = NFSV3_WCCRATTR; 2863 struct mbuf *mreq, *mrep, *md, *mb; 2864 2865 mtx_lock(&nmp->nm_mtx); 2866 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { 2867 mtx_unlock(&nmp->nm_mtx); 2868 return (0); 2869 } 2870 mtx_unlock(&nmp->nm_mtx); 2871 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2872 mreq = nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2873 mb = mreq; 2874 bpos = mtod(mb, caddr_t); 2875 nfsm_fhtom(vp, 1); 2876 tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED); 2877 txdr_hyper(offset, tl); 2878 tl += 2; 2879 *tl = txdr_unsigned(cnt); 2880 nfsm_request(vp, NFSPROC_COMMIT, td, cred); 2881 nfsm_wcc_data(vp, wccflag); 2882 if (!error) { 2883 tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF); 2884 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2885 NFSX_V3WRITEVERF)) { 2886 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2887 NFSX_V3WRITEVERF); 2888 error = NFSERR_STALEWRITEVERF; 2889 } 2890 } 2891 m_freem(mrep); 2892 nfsmout: 2893 return (error); 2894 } 2895 2896 /* 2897 * Strategy routine. 2898 * For async requests when nfsiod(s) are running, queue the request by 2899 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2900 * request. 2901 */ 2902 static int 2903 nfs_strategy(struct vop_strategy_args *ap) 2904 { 2905 struct buf *bp = ap->a_bp; 2906 struct ucred *cr; 2907 2908 KASSERT(!(bp->b_flags & B_DONE), 2909 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2910 BUF_ASSERT_HELD(bp); 2911 2912 if (bp->b_iocmd == BIO_READ) 2913 cr = bp->b_rcred; 2914 else 2915 cr = bp->b_wcred; 2916 2917 /* 2918 * If the op is asynchronous and an i/o daemon is waiting 2919 * queue the request, wake it up and wait for completion 2920 * otherwise just do it ourselves. 2921 */ 2922 if ((bp->b_flags & B_ASYNC) == 0 || 2923 nfs_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread)) 2924 (void)nfs_doio(ap->a_vp, bp, cr, curthread); 2925 return (0); 2926 } 2927 2928 /* 2929 * fsync vnode op. Just call nfs_flush() with commit == 1. 2930 */ 2931 /* ARGSUSED */ 2932 static int 2933 nfs_fsync(struct vop_fsync_args *ap) 2934 { 2935 2936 return (nfs_flush(ap->a_vp, ap->a_waitfor, 1)); 2937 } 2938 2939 /* 2940 * Flush all the blocks associated with a vnode. 2941 * Walk through the buffer pool and push any dirty pages 2942 * associated with the vnode. 2943 */ 2944 static int 2945 nfs_flush(struct vnode *vp, int waitfor, int commit) 2946 { 2947 struct nfsnode *np = VTONFS(vp); 2948 struct buf *bp; 2949 int i; 2950 struct buf *nbp; 2951 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2952 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2953 int passone = 1; 2954 u_quad_t off, endoff, toff; 2955 struct ucred* wcred = NULL; 2956 struct buf **bvec = NULL; 2957 struct bufobj *bo; 2958 struct thread *td = curthread; 2959 #ifndef NFS_COMMITBVECSIZ 2960 #define NFS_COMMITBVECSIZ 20 2961 #endif 2962 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2963 int bvecsize = 0, bveccount; 2964 2965 if (nmp->nm_flag & NFSMNT_INT) 2966 slpflag = NFS_PCATCH; 2967 if (!commit) 2968 passone = 0; 2969 bo = &vp->v_bufobj; 2970 /* 2971 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2972 * server, but has not been committed to stable storage on the server 2973 * yet. On the first pass, the byte range is worked out and the commit 2974 * rpc is done. On the second pass, nfs_writebp() is called to do the 2975 * job. 2976 */ 2977 again: 2978 off = (u_quad_t)-1; 2979 endoff = 0; 2980 bvecpos = 0; 2981 if (NFS_ISV3(vp) && commit) { 2982 if (bvec != NULL && bvec != bvec_on_stack) 2983 free(bvec, M_TEMP); 2984 /* 2985 * Count up how many buffers waiting for a commit. 2986 */ 2987 bveccount = 0; 2988 BO_LOCK(bo); 2989 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 2990 if (!BUF_ISLOCKED(bp) && 2991 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2992 == (B_DELWRI | B_NEEDCOMMIT)) 2993 bveccount++; 2994 } 2995 /* 2996 * Allocate space to remember the list of bufs to commit. It is 2997 * important to use M_NOWAIT here to avoid a race with nfs_write. 2998 * If we can't get memory (for whatever reason), we will end up 2999 * committing the buffers one-by-one in the loop below. 3000 */ 3001 if (bveccount > NFS_COMMITBVECSIZ) { 3002 /* 3003 * Release the vnode interlock to avoid a lock 3004 * order reversal. 3005 */ 3006 BO_UNLOCK(bo); 3007 bvec = (struct buf **) 3008 malloc(bveccount * sizeof(struct buf *), 3009 M_TEMP, M_NOWAIT); 3010 BO_LOCK(bo); 3011 if (bvec == NULL) { 3012 bvec = bvec_on_stack; 3013 bvecsize = NFS_COMMITBVECSIZ; 3014 } else 3015 bvecsize = bveccount; 3016 } else { 3017 bvec = bvec_on_stack; 3018 bvecsize = NFS_COMMITBVECSIZ; 3019 } 3020 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3021 if (bvecpos >= bvecsize) 3022 break; 3023 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3024 nbp = TAILQ_NEXT(bp, b_bobufs); 3025 continue; 3026 } 3027 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3028 (B_DELWRI | B_NEEDCOMMIT)) { 3029 BUF_UNLOCK(bp); 3030 nbp = TAILQ_NEXT(bp, b_bobufs); 3031 continue; 3032 } 3033 BO_UNLOCK(bo); 3034 bremfree(bp); 3035 /* 3036 * Work out if all buffers are using the same cred 3037 * so we can deal with them all with one commit. 3038 * 3039 * NOTE: we are not clearing B_DONE here, so we have 3040 * to do it later on in this routine if we intend to 3041 * initiate I/O on the bp. 3042 * 3043 * Note: to avoid loopback deadlocks, we do not 3044 * assign b_runningbufspace. 3045 */ 3046 if (wcred == NULL) 3047 wcred = bp->b_wcred; 3048 else if (wcred != bp->b_wcred) 3049 wcred = NOCRED; 3050 vfs_busy_pages(bp, 1); 3051 3052 BO_LOCK(bo); 3053 /* 3054 * bp is protected by being locked, but nbp is not 3055 * and vfs_busy_pages() may sleep. We have to 3056 * recalculate nbp. 3057 */ 3058 nbp = TAILQ_NEXT(bp, b_bobufs); 3059 3060 /* 3061 * A list of these buffers is kept so that the 3062 * second loop knows which buffers have actually 3063 * been committed. This is necessary, since there 3064 * may be a race between the commit rpc and new 3065 * uncommitted writes on the file. 3066 */ 3067 bvec[bvecpos++] = bp; 3068 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3069 bp->b_dirtyoff; 3070 if (toff < off) 3071 off = toff; 3072 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 3073 if (toff > endoff) 3074 endoff = toff; 3075 } 3076 BO_UNLOCK(bo); 3077 } 3078 if (bvecpos > 0) { 3079 /* 3080 * Commit data on the server, as required. 3081 * If all bufs are using the same wcred, then use that with 3082 * one call for all of them, otherwise commit each one 3083 * separately. 3084 */ 3085 if (wcred != NOCRED) 3086 retv = nfs_commit(vp, off, (int)(endoff - off), 3087 wcred, td); 3088 else { 3089 retv = 0; 3090 for (i = 0; i < bvecpos; i++) { 3091 off_t off, size; 3092 bp = bvec[i]; 3093 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 3094 bp->b_dirtyoff; 3095 size = (u_quad_t)(bp->b_dirtyend 3096 - bp->b_dirtyoff); 3097 retv = nfs_commit(vp, off, (int)size, 3098 bp->b_wcred, td); 3099 if (retv) break; 3100 } 3101 } 3102 3103 if (retv == NFSERR_STALEWRITEVERF) 3104 nfs_clearcommit(vp->v_mount); 3105 3106 /* 3107 * Now, either mark the blocks I/O done or mark the 3108 * blocks dirty, depending on whether the commit 3109 * succeeded. 3110 */ 3111 for (i = 0; i < bvecpos; i++) { 3112 bp = bvec[i]; 3113 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3114 if (retv) { 3115 /* 3116 * Error, leave B_DELWRI intact 3117 */ 3118 vfs_unbusy_pages(bp); 3119 brelse(bp); 3120 } else { 3121 /* 3122 * Success, remove B_DELWRI ( bundirty() ). 3123 * 3124 * b_dirtyoff/b_dirtyend seem to be NFS 3125 * specific. We should probably move that 3126 * into bundirty(). XXX 3127 */ 3128 bufobj_wref(bo); 3129 bp->b_flags |= B_ASYNC; 3130 bundirty(bp); 3131 bp->b_flags &= ~B_DONE; 3132 bp->b_ioflags &= ~BIO_ERROR; 3133 bp->b_dirtyoff = bp->b_dirtyend = 0; 3134 bufdone(bp); 3135 } 3136 } 3137 } 3138 3139 /* 3140 * Start/do any write(s) that are required. 3141 */ 3142 loop: 3143 BO_LOCK(bo); 3144 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 3145 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 3146 if (waitfor != MNT_WAIT || passone) 3147 continue; 3148 3149 error = BUF_TIMELOCK(bp, 3150 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 3151 BO_MTX(bo), "nfsfsync", slpflag, slptimeo); 3152 if (error == 0) { 3153 BUF_UNLOCK(bp); 3154 goto loop; 3155 } 3156 if (error == ENOLCK) { 3157 error = 0; 3158 goto loop; 3159 } 3160 if (nfs_sigintr(nmp, td)) { 3161 error = EINTR; 3162 goto done; 3163 } 3164 if (slpflag & PCATCH) { 3165 slpflag = 0; 3166 slptimeo = 2 * hz; 3167 } 3168 goto loop; 3169 } 3170 if ((bp->b_flags & B_DELWRI) == 0) 3171 panic("nfs_fsync: not dirty"); 3172 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 3173 BUF_UNLOCK(bp); 3174 continue; 3175 } 3176 BO_UNLOCK(bo); 3177 bremfree(bp); 3178 if (passone || !commit) 3179 bp->b_flags |= B_ASYNC; 3180 else 3181 bp->b_flags |= B_ASYNC; 3182 bwrite(bp); 3183 if (nfs_sigintr(nmp, td)) { 3184 error = EINTR; 3185 goto done; 3186 } 3187 goto loop; 3188 } 3189 if (passone) { 3190 passone = 0; 3191 BO_UNLOCK(bo); 3192 goto again; 3193 } 3194 if (waitfor == MNT_WAIT) { 3195 while (bo->bo_numoutput) { 3196 error = bufobj_wwait(bo, slpflag, slptimeo); 3197 if (error) { 3198 BO_UNLOCK(bo); 3199 error = nfs_sigintr(nmp, td); 3200 if (error) 3201 goto done; 3202 if (slpflag & PCATCH) { 3203 slpflag = 0; 3204 slptimeo = 2 * hz; 3205 } 3206 BO_LOCK(bo); 3207 } 3208 } 3209 if (bo->bo_dirty.bv_cnt != 0 && commit) { 3210 BO_UNLOCK(bo); 3211 goto loop; 3212 } 3213 /* 3214 * Wait for all the async IO requests to drain 3215 */ 3216 BO_UNLOCK(bo); 3217 mtx_lock(&np->n_mtx); 3218 while (np->n_directio_asyncwr > 0) { 3219 np->n_flag |= NFSYNCWAIT; 3220 error = nfs_msleep(td, (caddr_t)&np->n_directio_asyncwr, 3221 &np->n_mtx, slpflag | (PRIBIO + 1), 3222 "nfsfsync", 0); 3223 if (error) { 3224 if (nfs_sigintr(nmp, td)) { 3225 mtx_unlock(&np->n_mtx); 3226 error = EINTR; 3227 goto done; 3228 } 3229 } 3230 } 3231 mtx_unlock(&np->n_mtx); 3232 } else 3233 BO_UNLOCK(bo); 3234 mtx_lock(&np->n_mtx); 3235 if (np->n_flag & NWRITEERR) { 3236 error = np->n_error; 3237 np->n_flag &= ~NWRITEERR; 3238 } 3239 if (commit && bo->bo_dirty.bv_cnt == 0 && 3240 bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) 3241 np->n_flag &= ~NMODIFIED; 3242 mtx_unlock(&np->n_mtx); 3243 done: 3244 if (bvec != NULL && bvec != bvec_on_stack) 3245 free(bvec, M_TEMP); 3246 return (error); 3247 } 3248 3249 /* 3250 * NFS advisory byte-level locks. 3251 */ 3252 static int 3253 nfs_advlock(struct vop_advlock_args *ap) 3254 { 3255 struct vnode *vp = ap->a_vp; 3256 u_quad_t size; 3257 int error; 3258 3259 error = vn_lock(vp, LK_SHARED); 3260 if (error) 3261 return (error); 3262 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3263 size = VTONFS(vp)->n_size; 3264 VOP_UNLOCK(vp, 0); 3265 error = lf_advlock(ap, &(vp->v_lockf), size); 3266 } else { 3267 if (nfs_advlock_p) 3268 error = nfs_advlock_p(ap); 3269 else 3270 error = ENOLCK; 3271 } 3272 3273 return (error); 3274 } 3275 3276 /* 3277 * NFS advisory byte-level locks. 3278 */ 3279 static int 3280 nfs_advlockasync(struct vop_advlockasync_args *ap) 3281 { 3282 struct vnode *vp = ap->a_vp; 3283 u_quad_t size; 3284 int error; 3285 3286 error = vn_lock(vp, LK_SHARED); 3287 if (error) 3288 return (error); 3289 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 3290 size = VTONFS(vp)->n_size; 3291 VOP_UNLOCK(vp, 0); 3292 error = lf_advlockasync(ap, &(vp->v_lockf), size); 3293 } else { 3294 VOP_UNLOCK(vp, 0); 3295 error = EOPNOTSUPP; 3296 } 3297 return (error); 3298 } 3299 3300 /* 3301 * Print out the contents of an nfsnode. 3302 */ 3303 static int 3304 nfs_print(struct vop_print_args *ap) 3305 { 3306 struct vnode *vp = ap->a_vp; 3307 struct nfsnode *np = VTONFS(vp); 3308 3309 nfs_printf("\tfileid %ld fsid 0x%x", 3310 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3311 if (vp->v_type == VFIFO) 3312 fifo_printinfo(vp); 3313 printf("\n"); 3314 return (0); 3315 } 3316 3317 /* 3318 * This is the "real" nfs::bwrite(struct buf*). 3319 * We set B_CACHE if this is a VMIO buffer. 3320 */ 3321 int 3322 nfs_writebp(struct buf *bp, int force __unused, struct thread *td) 3323 { 3324 int s; 3325 int oldflags = bp->b_flags; 3326 #if 0 3327 int retv = 1; 3328 off_t off; 3329 #endif 3330 3331 BUF_ASSERT_HELD(bp); 3332 3333 if (bp->b_flags & B_INVAL) { 3334 brelse(bp); 3335 return(0); 3336 } 3337 3338 bp->b_flags |= B_CACHE; 3339 3340 /* 3341 * Undirty the bp. We will redirty it later if the I/O fails. 3342 */ 3343 3344 s = splbio(); 3345 bundirty(bp); 3346 bp->b_flags &= ~B_DONE; 3347 bp->b_ioflags &= ~BIO_ERROR; 3348 bp->b_iocmd = BIO_WRITE; 3349 3350 bufobj_wref(bp->b_bufobj); 3351 curthread->td_ru.ru_oublock++; 3352 splx(s); 3353 3354 /* 3355 * Note: to avoid loopback deadlocks, we do not 3356 * assign b_runningbufspace. 3357 */ 3358 vfs_busy_pages(bp, 1); 3359 3360 BUF_KERNPROC(bp); 3361 bp->b_iooffset = dbtob(bp->b_blkno); 3362 bstrategy(bp); 3363 3364 if( (oldflags & B_ASYNC) == 0) { 3365 int rtval = bufwait(bp); 3366 3367 if (oldflags & B_DELWRI) { 3368 s = splbio(); 3369 reassignbuf(bp); 3370 splx(s); 3371 } 3372 brelse(bp); 3373 return (rtval); 3374 } 3375 3376 return (0); 3377 } 3378 3379 /* 3380 * nfs special file access vnode op. 3381 * Essentially just get vattr and then imitate iaccess() since the device is 3382 * local to the client. 3383 */ 3384 static int 3385 nfsspec_access(struct vop_access_args *ap) 3386 { 3387 struct vattr *vap; 3388 struct ucred *cred = ap->a_cred; 3389 struct vnode *vp = ap->a_vp; 3390 accmode_t accmode = ap->a_accmode; 3391 struct vattr vattr; 3392 int error; 3393 3394 /* 3395 * Disallow write attempts on filesystems mounted read-only; 3396 * unless the file is a socket, fifo, or a block or character 3397 * device resident on the filesystem. 3398 */ 3399 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3400 switch (vp->v_type) { 3401 case VREG: 3402 case VDIR: 3403 case VLNK: 3404 return (EROFS); 3405 default: 3406 break; 3407 } 3408 } 3409 vap = &vattr; 3410 error = VOP_GETATTR(vp, vap, cred); 3411 if (error) 3412 goto out; 3413 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3414 accmode, cred, NULL); 3415 out: 3416 return error; 3417 } 3418 3419 /* 3420 * Read wrapper for fifos. 3421 */ 3422 static int 3423 nfsfifo_read(struct vop_read_args *ap) 3424 { 3425 struct nfsnode *np = VTONFS(ap->a_vp); 3426 int error; 3427 3428 /* 3429 * Set access flag. 3430 */ 3431 mtx_lock(&np->n_mtx); 3432 np->n_flag |= NACC; 3433 getnanotime(&np->n_atim); 3434 mtx_unlock(&np->n_mtx); 3435 error = fifo_specops.vop_read(ap); 3436 return error; 3437 } 3438 3439 /* 3440 * Write wrapper for fifos. 3441 */ 3442 static int 3443 nfsfifo_write(struct vop_write_args *ap) 3444 { 3445 struct nfsnode *np = VTONFS(ap->a_vp); 3446 3447 /* 3448 * Set update flag. 3449 */ 3450 mtx_lock(&np->n_mtx); 3451 np->n_flag |= NUPD; 3452 getnanotime(&np->n_mtim); 3453 mtx_unlock(&np->n_mtx); 3454 return(fifo_specops.vop_write(ap)); 3455 } 3456 3457 /* 3458 * Close wrapper for fifos. 3459 * 3460 * Update the times on the nfsnode then do fifo close. 3461 */ 3462 static int 3463 nfsfifo_close(struct vop_close_args *ap) 3464 { 3465 struct vnode *vp = ap->a_vp; 3466 struct nfsnode *np = VTONFS(vp); 3467 struct vattr vattr; 3468 struct timespec ts; 3469 3470 mtx_lock(&np->n_mtx); 3471 if (np->n_flag & (NACC | NUPD)) { 3472 getnanotime(&ts); 3473 if (np->n_flag & NACC) 3474 np->n_atim = ts; 3475 if (np->n_flag & NUPD) 3476 np->n_mtim = ts; 3477 np->n_flag |= NCHG; 3478 if (vrefcnt(vp) == 1 && 3479 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3480 VATTR_NULL(&vattr); 3481 if (np->n_flag & NACC) 3482 vattr.va_atime = np->n_atim; 3483 if (np->n_flag & NUPD) 3484 vattr.va_mtime = np->n_mtim; 3485 mtx_unlock(&np->n_mtx); 3486 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3487 goto out; 3488 } 3489 } 3490 mtx_unlock(&np->n_mtx); 3491 out: 3492 return (fifo_specops.vop_close(ap)); 3493 } 3494 3495 /* 3496 * Just call nfs_writebp() with the force argument set to 1. 3497 * 3498 * NOTE: B_DONE may or may not be set in a_bp on call. 3499 */ 3500 static int 3501 nfs_bwrite(struct buf *bp) 3502 { 3503 3504 return (nfs_writebp(bp, 1, curthread)); 3505 } 3506 3507 struct buf_ops buf_ops_nfs = { 3508 .bop_name = "buf_ops_nfs", 3509 .bop_write = nfs_bwrite, 3510 .bop_strategy = bufstrategy, 3511 .bop_sync = bufsync, 3512 .bop_bdflush = bufbdflush, 3513 };
Cache object: fbe795f1f272936630fa753e2dfda117
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