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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/6.3/sys/nfsclient/nfs_vnops.c 170553 2007-06-11 10:53:48Z kib $"); 37 38 /* 39 * vnode op calls for Sun NFS version 2 and 3 40 */ 41 42 #include "opt_inet.h" 43 44 #include <sys/param.h> 45 #include <sys/kernel.h> 46 #include <sys/systm.h> 47 #include <sys/resourcevar.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 #include <sys/bio.h> 51 #include <sys/buf.h> 52 #include <sys/malloc.h> 53 #include <sys/mbuf.h> 54 #include <sys/namei.h> 55 #include <sys/socket.h> 56 #include <sys/vnode.h> 57 #include <sys/dirent.h> 58 #include <sys/fcntl.h> 59 #include <sys/lockf.h> 60 #include <sys/stat.h> 61 #include <sys/sysctl.h> 62 #include <sys/signalvar.h> 63 64 #include <vm/vm.h> 65 #include <vm/vm_object.h> 66 #include <vm/vm_extern.h> 67 #include <vm/vm_object.h> 68 69 #include <fs/fifofs/fifo.h> 70 71 #include <rpc/rpcclnt.h> 72 73 #include <nfs/rpcv2.h> 74 #include <nfs/nfsproto.h> 75 #include <nfsclient/nfs.h> 76 #include <nfsclient/nfsnode.h> 77 #include <nfsclient/nfsmount.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 /* Defs */ 87 #define TRUE 1 88 #define FALSE 0 89 90 /* 91 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these 92 * calls are not in getblk() and brelse() so that they would not be necessary 93 * here. 94 */ 95 #ifndef B_VMIO 96 #define vfs_busy_pages(bp, f) 97 #endif 98 99 static vop_read_t nfsfifo_read; 100 static vop_write_t nfsfifo_write; 101 static vop_close_t nfsfifo_close; 102 static int nfs_flush(struct vnode *, int, struct thread *, 103 int); 104 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *, 105 struct thread *); 106 static vop_lookup_t nfs_lookup; 107 static vop_create_t nfs_create; 108 static vop_mknod_t nfs_mknod; 109 static vop_open_t nfs_open; 110 static vop_close_t nfs_close; 111 static vop_access_t nfs_access; 112 static vop_getattr_t nfs_getattr; 113 static vop_setattr_t nfs_setattr; 114 static vop_read_t nfs_read; 115 static vop_fsync_t nfs_fsync; 116 static vop_remove_t nfs_remove; 117 static vop_link_t nfs_link; 118 static vop_rename_t nfs_rename; 119 static vop_mkdir_t nfs_mkdir; 120 static vop_rmdir_t nfs_rmdir; 121 static vop_symlink_t nfs_symlink; 122 static vop_readdir_t nfs_readdir; 123 static vop_strategy_t nfs_strategy; 124 static int nfs_lookitup(struct vnode *, const char *, int, 125 struct ucred *, struct thread *, struct nfsnode **); 126 static int nfs_sillyrename(struct vnode *, struct vnode *, 127 struct componentname *); 128 static vop_access_t nfsspec_access; 129 static vop_readlink_t nfs_readlink; 130 static vop_print_t nfs_print; 131 static vop_advlock_t nfs_advlock; 132 133 /* 134 * Global vfs data structures for nfs 135 */ 136 struct vop_vector nfs_vnodeops = { 137 .vop_default = &default_vnodeops, 138 .vop_access = nfs_access, 139 .vop_advlock = nfs_advlock, 140 .vop_close = nfs_close, 141 .vop_create = nfs_create, 142 .vop_fsync = nfs_fsync, 143 .vop_getattr = nfs_getattr, 144 .vop_getpages = nfs_getpages, 145 .vop_putpages = nfs_putpages, 146 .vop_inactive = nfs_inactive, 147 .vop_lease = VOP_NULL, 148 .vop_link = nfs_link, 149 .vop_lookup = nfs_lookup, 150 .vop_mkdir = nfs_mkdir, 151 .vop_mknod = nfs_mknod, 152 .vop_open = nfs_open, 153 .vop_print = nfs_print, 154 .vop_read = nfs_read, 155 .vop_readdir = nfs_readdir, 156 .vop_readlink = nfs_readlink, 157 .vop_reclaim = nfs_reclaim, 158 .vop_remove = nfs_remove, 159 .vop_rename = nfs_rename, 160 .vop_rmdir = nfs_rmdir, 161 .vop_setattr = nfs_setattr, 162 .vop_strategy = nfs_strategy, 163 .vop_symlink = nfs_symlink, 164 .vop_write = nfs_write, 165 }; 166 167 struct vop_vector nfs_fifoops = { 168 .vop_default = &fifo_specops, 169 .vop_access = nfsspec_access, 170 .vop_close = nfsfifo_close, 171 .vop_fsync = nfs_fsync, 172 .vop_getattr = nfs_getattr, 173 .vop_inactive = nfs_inactive, 174 .vop_print = nfs_print, 175 .vop_read = nfsfifo_read, 176 .vop_reclaim = nfs_reclaim, 177 .vop_setattr = nfs_setattr, 178 .vop_write = nfsfifo_write, 179 }; 180 181 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, 182 struct componentname *cnp, struct vattr *vap); 183 static int nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 184 struct ucred *cred, struct thread *td); 185 static int nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, 186 int fnamelen, struct vnode *tdvp, 187 const char *tnameptr, int tnamelen, 188 struct ucred *cred, struct thread *td); 189 static int nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 190 struct sillyrename *sp); 191 192 /* 193 * Global variables 194 */ 195 struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON]; 196 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; 197 int nfs_numasync = 0; 198 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1)) 199 200 SYSCTL_DECL(_vfs_nfs); 201 202 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 203 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 204 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 205 206 static int nfsv3_commit_on_close = 0; 207 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 208 &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); 209 210 static int nfs_clean_pages_on_close = 1; 211 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, 212 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); 213 214 int nfs_directio_enable = 0; 215 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, 216 &nfs_directio_enable, 0, "Enable NFS directio"); 217 218 /* 219 * This sysctl allows other processes to mmap a file that has been opened 220 * O_DIRECT by a process. In general, having processes mmap the file while 221 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow 222 * this by default to prevent DoS attacks - to prevent a malicious user from 223 * opening up files O_DIRECT preventing other users from mmap'ing these 224 * files. "Protected" environments where stricter consistency guarantees are 225 * required can disable this knob. The process that opened the file O_DIRECT 226 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not 227 * meaningful. 228 */ 229 int nfs_directio_allow_mmap = 1; 230 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, 231 &nfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); 232 233 #if 0 234 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 235 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 236 237 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 238 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 239 #endif 240 241 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 242 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 243 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 244 static int 245 nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td, 246 struct ucred *cred) 247 { 248 const int v3 = 1; 249 u_int32_t *tl; 250 int error = 0, attrflag; 251 252 struct mbuf *mreq, *mrep, *md, *mb; 253 caddr_t bpos, dpos; 254 u_int32_t rmode; 255 struct nfsnode *np = VTONFS(vp); 256 257 nfsstats.rpccnt[NFSPROC_ACCESS]++; 258 mreq = nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 259 mb = mreq; 260 bpos = mtod(mb, caddr_t); 261 nfsm_fhtom(vp, v3); 262 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 263 *tl = txdr_unsigned(wmode); 264 nfsm_request(vp, NFSPROC_ACCESS, td, cred); 265 nfsm_postop_attr(vp, attrflag); 266 if (!error) { 267 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 268 rmode = fxdr_unsigned(u_int32_t, *tl); 269 np->n_mode = rmode; 270 np->n_modeuid = cred->cr_uid; 271 np->n_modestamp = time_second; 272 } 273 m_freem(mrep); 274 nfsmout: 275 return (error); 276 } 277 278 /* 279 * nfs access vnode op. 280 * For nfs version 2, just return ok. File accesses may fail later. 281 * For nfs version 3, use the access rpc to check accessibility. If file modes 282 * are changed on the server, accesses might still fail later. 283 */ 284 static int 285 nfs_access(struct vop_access_args *ap) 286 { 287 struct vnode *vp = ap->a_vp; 288 int error = 0; 289 u_int32_t mode, wmode; 290 int v3 = NFS_ISV3(vp); 291 struct nfsnode *np = VTONFS(vp); 292 293 /* 294 * Disallow write attempts on filesystems mounted read-only; 295 * unless the file is a socket, fifo, or a block or character 296 * device resident on the filesystem. 297 */ 298 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 299 switch (vp->v_type) { 300 case VREG: 301 case VDIR: 302 case VLNK: 303 return (EROFS); 304 default: 305 break; 306 } 307 } 308 /* 309 * For nfs v3, check to see if we have done this recently, and if 310 * so return our cached result instead of making an ACCESS call. 311 * If not, do an access rpc, otherwise you are stuck emulating 312 * ufs_access() locally using the vattr. This may not be correct, 313 * since the server may apply other access criteria such as 314 * client uid-->server uid mapping that we do not know about. 315 */ 316 if (v3) { 317 if (ap->a_mode & VREAD) 318 mode = NFSV3ACCESS_READ; 319 else 320 mode = 0; 321 if (vp->v_type != VDIR) { 322 if (ap->a_mode & VWRITE) 323 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 324 if (ap->a_mode & VEXEC) 325 mode |= NFSV3ACCESS_EXECUTE; 326 } else { 327 if (ap->a_mode & VWRITE) 328 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 329 NFSV3ACCESS_DELETE); 330 if (ap->a_mode & VEXEC) 331 mode |= NFSV3ACCESS_LOOKUP; 332 } 333 /* XXX safety belt, only make blanket request if caching */ 334 if (nfsaccess_cache_timeout > 0) { 335 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 336 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 337 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 338 } else { 339 wmode = mode; 340 } 341 342 /* 343 * Does our cached result allow us to give a definite yes to 344 * this request? 345 */ 346 if ((time_second < (np->n_modestamp + nfsaccess_cache_timeout)) && 347 (ap->a_cred->cr_uid == np->n_modeuid) && 348 ((np->n_mode & mode) == mode)) { 349 nfsstats.accesscache_hits++; 350 } else { 351 /* 352 * Either a no, or a don't know. Go to the wire. 353 */ 354 nfsstats.accesscache_misses++; 355 error = nfs3_access_otw(vp, wmode, ap->a_td,ap->a_cred); 356 if (!error) { 357 if ((np->n_mode & mode) != mode) { 358 error = EACCES; 359 } 360 } 361 } 362 return (error); 363 } else { 364 if ((error = nfsspec_access(ap)) != 0) 365 return (error); 366 367 /* 368 * Attempt to prevent a mapped root from accessing a file 369 * which it shouldn't. We try to read a byte from the file 370 * if the user is root and the file is not zero length. 371 * After calling nfsspec_access, we should have the correct 372 * file size cached. 373 */ 374 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD) 375 && VTONFS(vp)->n_size > 0) { 376 struct iovec aiov; 377 struct uio auio; 378 char buf[1]; 379 380 aiov.iov_base = buf; 381 aiov.iov_len = 1; 382 auio.uio_iov = &aiov; 383 auio.uio_iovcnt = 1; 384 auio.uio_offset = 0; 385 auio.uio_resid = 1; 386 auio.uio_segflg = UIO_SYSSPACE; 387 auio.uio_rw = UIO_READ; 388 auio.uio_td = ap->a_td; 389 390 if (vp->v_type == VREG) 391 error = nfs_readrpc(vp, &auio, ap->a_cred); 392 else if (vp->v_type == VDIR) { 393 char* bp; 394 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 395 aiov.iov_base = bp; 396 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 397 error = nfs_readdirrpc(vp, &auio, ap->a_cred); 398 free(bp, M_TEMP); 399 } else if (vp->v_type == VLNK) 400 error = nfs_readlinkrpc(vp, &auio, ap->a_cred); 401 else 402 error = EACCES; 403 } 404 return (error); 405 } 406 } 407 408 /* 409 * nfs open vnode op 410 * Check to see if the type is ok 411 * and that deletion is not in progress. 412 * For paged in text files, you will need to flush the page cache 413 * if consistency is lost. 414 */ 415 /* ARGSUSED */ 416 static int 417 nfs_open(struct vop_open_args *ap) 418 { 419 struct vnode *vp = ap->a_vp; 420 struct nfsnode *np = VTONFS(vp); 421 struct vattr vattr; 422 int error; 423 int fmode = ap->a_mode; 424 425 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 426 return (EOPNOTSUPP); 427 428 /* 429 * Get a valid lease. If cached data is stale, flush it. 430 */ 431 if (np->n_flag & NMODIFIED) { 432 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 433 if (error == EINTR || error == EIO) 434 return (error); 435 np->n_attrstamp = 0; 436 if (vp->v_type == VDIR) 437 np->n_direofoffset = 0; 438 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td); 439 if (error) 440 return (error); 441 np->n_mtime = vattr.va_mtime; 442 } else { 443 np->n_attrstamp = 0; 444 error = VOP_GETATTR(vp, &vattr, ap->a_cred, ap->a_td); 445 if (error) 446 return (error); 447 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 448 if (vp->v_type == VDIR) 449 np->n_direofoffset = 0; 450 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 451 if (error == EINTR || error == EIO) 452 return (error); 453 np->n_mtime = vattr.va_mtime; 454 } 455 } 456 /* 457 * If the object has >= 1 O_DIRECT active opens, we disable caching. 458 */ 459 if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 460 if (np->n_directio_opens == 0) { 461 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 462 if (error) 463 return (error); 464 np->n_flag |= NNONCACHE; 465 } 466 np->n_directio_opens++; 467 } 468 np->ra_expect_lbn = 0; 469 vnode_create_vobject_off(vp, vattr.va_size, ap->a_td); 470 return (0); 471 } 472 473 /* 474 * nfs close vnode op 475 * What an NFS client should do upon close after writing is a debatable issue. 476 * Most NFS clients push delayed writes to the server upon close, basically for 477 * two reasons: 478 * 1 - So that any write errors may be reported back to the client process 479 * doing the close system call. By far the two most likely errors are 480 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 481 * 2 - To put a worst case upper bound on cache inconsistency between 482 * multiple clients for the file. 483 * There is also a consistency problem for Version 2 of the protocol w.r.t. 484 * not being able to tell if other clients are writing a file concurrently, 485 * since there is no way of knowing if the changed modify time in the reply 486 * is only due to the write for this client. 487 * (NFS Version 3 provides weak cache consistency data in the reply that 488 * should be sufficient to detect and handle this case.) 489 * 490 * The current code does the following: 491 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 492 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 493 * or commit them (this satisfies 1 and 2 except for the 494 * case where the server crashes after this close but 495 * before the commit RPC, which is felt to be "good 496 * enough". Changing the last argument to nfs_flush() to 497 * a 1 would force a commit operation, if it is felt a 498 * commit is necessary now. 499 */ 500 /* ARGSUSED */ 501 static int 502 nfs_close(struct vop_close_args *ap) 503 { 504 struct vnode *vp = ap->a_vp; 505 struct nfsnode *np = VTONFS(vp); 506 int error = 0; 507 int fmode = ap->a_fflag; 508 509 if (vp->v_type == VREG) { 510 /* 511 * Examine and clean dirty pages, regardless of NMODIFIED. 512 * This closes a major hole in close-to-open consistency. 513 * We want to push out all dirty pages (and buffers) on 514 * close, regardless of whether they were dirtied by 515 * mmap'ed writes or via write(). 516 */ 517 if (nfs_clean_pages_on_close && vp->v_object) { 518 VM_OBJECT_LOCK(vp->v_object); 519 vm_object_page_clean(vp->v_object, 0, 0, 0); 520 VM_OBJECT_UNLOCK(vp->v_object); 521 } 522 if (np->n_flag & NMODIFIED) { 523 if (NFS_ISV3(vp)) { 524 /* 525 * Under NFSv3 we have dirty buffers to dispose of. We 526 * must flush them to the NFS server. We have the option 527 * of waiting all the way through the commit rpc or just 528 * waiting for the initial write. The default is to only 529 * wait through the initial write so the data is in the 530 * server's cache, which is roughly similar to the state 531 * a standard disk subsystem leaves the file in on close(). 532 * 533 * We cannot clear the NMODIFIED bit in np->n_flag due to 534 * potential races with other processes, and certainly 535 * cannot clear it if we don't commit. 536 */ 537 int cm = nfsv3_commit_on_close ? 1 : 0; 538 error = nfs_flush(vp, MNT_WAIT, ap->a_td, cm); 539 /* np->n_flag &= ~NMODIFIED; */ 540 } else 541 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 542 } 543 /* 544 * Invalidate the attribute cache in all cases. 545 * An open is going to fetch fresh attrs any way, other procs 546 * on this node that have file open will be forced to do an 547 * otw attr fetch, but this is safe. 548 */ 549 np->n_attrstamp = 0; 550 if (np->n_flag & NWRITEERR) { 551 np->n_flag &= ~NWRITEERR; 552 error = np->n_error; 553 } 554 } 555 if (nfs_directio_enable) 556 KASSERT((np->n_directio_asyncwr == 0), 557 ("nfs_close: dirty unflushed (%d) directio buffers\n", 558 np->n_directio_asyncwr)); 559 if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { 560 KASSERT((np->n_directio_opens > 0), 561 ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); 562 np->n_directio_opens--; 563 if (np->n_directio_opens == 0) 564 np->n_flag &= ~NNONCACHE; 565 } 566 return (error); 567 } 568 569 /* 570 * nfs getattr call from vfs. 571 */ 572 static int 573 nfs_getattr(struct vop_getattr_args *ap) 574 { 575 struct vnode *vp = ap->a_vp; 576 struct nfsnode *np = VTONFS(vp); 577 caddr_t bpos, dpos; 578 int error = 0; 579 struct mbuf *mreq, *mrep, *md, *mb; 580 int v3 = NFS_ISV3(vp); 581 582 /* 583 * Update local times for special files. 584 */ 585 if (np->n_flag & (NACC | NUPD)) 586 np->n_flag |= NCHG; 587 /* 588 * First look in the cache. 589 */ 590 if (nfs_getattrcache(vp, ap->a_vap) == 0) 591 return (0); 592 593 if (v3 && nfsaccess_cache_timeout > 0) { 594 nfsstats.accesscache_misses++; 595 nfs3_access_otw(vp, NFSV3ACCESS_ALL, ap->a_td, ap->a_cred); 596 if (nfs_getattrcache(vp, ap->a_vap) == 0) 597 return (0); 598 } 599 600 nfsstats.rpccnt[NFSPROC_GETATTR]++; 601 mreq = nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); 602 mb = mreq; 603 bpos = mtod(mb, caddr_t); 604 nfsm_fhtom(vp, v3); 605 nfsm_request(vp, NFSPROC_GETATTR, ap->a_td, ap->a_cred); 606 if (!error) { 607 nfsm_loadattr(vp, ap->a_vap); 608 } 609 m_freem(mrep); 610 nfsmout: 611 return (error); 612 } 613 614 /* 615 * nfs setattr call. 616 */ 617 static int 618 nfs_setattr(struct vop_setattr_args *ap) 619 { 620 struct vnode *vp = ap->a_vp; 621 struct nfsnode *np = VTONFS(vp); 622 struct vattr *vap = ap->a_vap; 623 int error = 0; 624 u_quad_t tsize; 625 626 #ifndef nolint 627 tsize = (u_quad_t)0; 628 #endif 629 630 /* 631 * Setting of flags and marking of atimes are not supported. 632 */ 633 if (vap->va_flags != VNOVAL || (vap->va_vaflags & VA_MARK_ATIME)) 634 return (EOPNOTSUPP); 635 636 /* 637 * Disallow write attempts if the filesystem is mounted read-only. 638 */ 639 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 640 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 641 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 642 (vp->v_mount->mnt_flag & MNT_RDONLY)) 643 return (EROFS); 644 if (vap->va_size != VNOVAL) { 645 switch (vp->v_type) { 646 case VDIR: 647 return (EISDIR); 648 case VCHR: 649 case VBLK: 650 case VSOCK: 651 case VFIFO: 652 if (vap->va_mtime.tv_sec == VNOVAL && 653 vap->va_atime.tv_sec == VNOVAL && 654 vap->va_mode == (mode_t)VNOVAL && 655 vap->va_uid == (uid_t)VNOVAL && 656 vap->va_gid == (gid_t)VNOVAL) 657 return (0); 658 vap->va_size = VNOVAL; 659 break; 660 default: 661 /* 662 * Disallow write attempts if the filesystem is 663 * mounted read-only. 664 */ 665 if (vp->v_mount->mnt_flag & MNT_RDONLY) 666 return (EROFS); 667 668 /* 669 * We run vnode_pager_setsize() early (why?), 670 * we must set np->n_size now to avoid vinvalbuf 671 * V_SAVE races that might setsize a lower 672 * value. 673 */ 674 675 tsize = np->n_size; 676 error = nfs_meta_setsize(vp, ap->a_cred, 677 ap->a_td, vap->va_size); 678 679 if (np->n_flag & NMODIFIED) { 680 if (vap->va_size == 0) 681 error = nfs_vinvalbuf(vp, 0, ap->a_td, 1); 682 else 683 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 684 if (error) { 685 vnode_pager_setsize(vp, np->n_size); 686 return (error); 687 } 688 } 689 /* 690 * np->n_size has already been set to vap->va_size 691 * in nfs_meta_setsize(). We must set it again since 692 * nfs_loadattrcache() could be called through 693 * nfs_meta_setsize() and could modify np->n_size. 694 */ 695 np->n_vattr.va_size = np->n_size = vap->va_size; 696 }; 697 } else if ((vap->va_mtime.tv_sec != VNOVAL || 698 vap->va_atime.tv_sec != VNOVAL) && (np->n_flag & NMODIFIED) && 699 vp->v_type == VREG && 700 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) != 0 && 701 (error == EINTR || error == EIO)) 702 return (error); 703 error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_td); 704 if (error && vap->va_size != VNOVAL) { 705 np->n_size = np->n_vattr.va_size = tsize; 706 vnode_pager_setsize(vp, np->n_size); 707 } 708 return (error); 709 } 710 711 /* 712 * Do an nfs setattr rpc. 713 */ 714 static int 715 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, 716 struct thread *td) 717 { 718 struct nfsv2_sattr *sp; 719 struct nfsnode *np = VTONFS(vp); 720 caddr_t bpos, dpos; 721 u_int32_t *tl; 722 int error = 0, wccflag = NFSV3_WCCRATTR; 723 struct mbuf *mreq, *mrep, *md, *mb; 724 int v3 = NFS_ISV3(vp); 725 726 nfsstats.rpccnt[NFSPROC_SETATTR]++; 727 mreq = nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 728 mb = mreq; 729 bpos = mtod(mb, caddr_t); 730 nfsm_fhtom(vp, v3); 731 if (v3) { 732 nfsm_v3attrbuild(vap, TRUE); 733 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 734 *tl = nfs_false; 735 } else { 736 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 737 if (vap->va_mode == (mode_t)VNOVAL) 738 sp->sa_mode = nfs_xdrneg1; 739 else 740 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 741 if (vap->va_uid == (uid_t)VNOVAL) 742 sp->sa_uid = nfs_xdrneg1; 743 else 744 sp->sa_uid = txdr_unsigned(vap->va_uid); 745 if (vap->va_gid == (gid_t)VNOVAL) 746 sp->sa_gid = nfs_xdrneg1; 747 else 748 sp->sa_gid = txdr_unsigned(vap->va_gid); 749 sp->sa_size = txdr_unsigned(vap->va_size); 750 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 751 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 752 } 753 nfsm_request(vp, NFSPROC_SETATTR, td, cred); 754 if (v3) { 755 np->n_modestamp = 0; 756 nfsm_wcc_data(vp, wccflag); 757 } else 758 nfsm_loadattr(vp, NULL); 759 m_freem(mrep); 760 nfsmout: 761 return (error); 762 } 763 764 /* 765 * nfs lookup call, one step at a time... 766 * First look in cache 767 * If not found, unlock the directory nfsnode and do the rpc 768 */ 769 static int 770 nfs_lookup(struct vop_lookup_args *ap) 771 { 772 struct componentname *cnp = ap->a_cnp; 773 struct vnode *dvp = ap->a_dvp; 774 struct vnode **vpp = ap->a_vpp; 775 int flags = cnp->cn_flags; 776 struct vnode *newvp; 777 struct nfsmount *nmp; 778 caddr_t bpos, dpos; 779 struct mbuf *mreq, *mrep, *md, *mb; 780 long len; 781 nfsfh_t *fhp; 782 struct nfsnode *np; 783 int error = 0, attrflag, fhsize; 784 int v3 = NFS_ISV3(dvp); 785 struct thread *td = cnp->cn_thread; 786 787 *vpp = NULLVP; 788 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 789 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 790 return (EROFS); 791 if (dvp->v_type != VDIR) 792 return (ENOTDIR); 793 nmp = VFSTONFS(dvp->v_mount); 794 np = VTONFS(dvp); 795 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) { 796 *vpp = NULLVP; 797 return (error); 798 } 799 if ((error = cache_lookup(dvp, vpp, cnp)) && error != ENOENT) { 800 struct vattr vattr; 801 802 newvp = *vpp; 803 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, td) 804 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 805 nfsstats.lookupcache_hits++; 806 if (cnp->cn_nameiop != LOOKUP && 807 (flags & ISLASTCN)) 808 cnp->cn_flags |= SAVENAME; 809 return (0); 810 } 811 cache_purge(newvp); 812 if (dvp != newvp) 813 vput(newvp); 814 else 815 vrele(newvp); 816 *vpp = NULLVP; 817 } 818 error = 0; 819 newvp = NULLVP; 820 nfsstats.lookupcache_misses++; 821 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 822 len = cnp->cn_namelen; 823 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 824 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 825 mb = mreq; 826 bpos = mtod(mb, caddr_t); 827 nfsm_fhtom(dvp, v3); 828 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 829 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred); 830 if (error) { 831 if (v3) { 832 nfsm_postop_attr(dvp, attrflag); 833 m_freem(mrep); 834 } 835 goto nfsmout; 836 } 837 nfsm_getfh(fhp, fhsize, v3); 838 839 /* 840 * Handle RENAME case... 841 */ 842 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 843 if (NFS_CMPFH(np, fhp, fhsize)) { 844 m_freem(mrep); 845 return (EISDIR); 846 } 847 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, LK_EXCLUSIVE); 848 if (error) { 849 m_freem(mrep); 850 return (error); 851 } 852 newvp = NFSTOV(np); 853 if (v3) { 854 nfsm_postop_attr(newvp, attrflag); 855 nfsm_postop_attr(dvp, attrflag); 856 } else 857 nfsm_loadattr(newvp, NULL); 858 *vpp = newvp; 859 m_freem(mrep); 860 cnp->cn_flags |= SAVENAME; 861 return (0); 862 } 863 864 if (flags & ISDOTDOT) { 865 VOP_UNLOCK(dvp, 0, td); 866 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, cnp->cn_lkflags); 867 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 868 if (error) 869 return (error); 870 newvp = NFSTOV(np); 871 } else if (NFS_CMPFH(np, fhp, fhsize)) { 872 VREF(dvp); 873 newvp = dvp; 874 } else { 875 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, cnp->cn_lkflags); 876 if (error) { 877 m_freem(mrep); 878 return (error); 879 } 880 newvp = NFSTOV(np); 881 } 882 if (v3) { 883 nfsm_postop_attr(newvp, attrflag); 884 nfsm_postop_attr(dvp, attrflag); 885 } else 886 nfsm_loadattr(newvp, NULL); 887 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 888 cnp->cn_flags |= SAVENAME; 889 if ((cnp->cn_flags & MAKEENTRY) && 890 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) { 891 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 892 cache_enter(dvp, newvp, cnp); 893 } 894 *vpp = newvp; 895 m_freem(mrep); 896 nfsmout: 897 if (error) { 898 if (newvp != NULLVP) { 899 vput(newvp); 900 *vpp = NULLVP; 901 } 902 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 903 (flags & ISLASTCN) && error == ENOENT) { 904 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 905 error = EROFS; 906 else 907 error = EJUSTRETURN; 908 } 909 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 910 cnp->cn_flags |= SAVENAME; 911 } 912 return (error); 913 } 914 915 /* 916 * nfs read call. 917 * Just call nfs_bioread() to do the work. 918 */ 919 static int 920 nfs_read(struct vop_read_args *ap) 921 { 922 struct vnode *vp = ap->a_vp; 923 924 switch (vp->v_type) { 925 case VREG: 926 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); 927 case VDIR: 928 return (EISDIR); 929 default: 930 return (EOPNOTSUPP); 931 } 932 } 933 934 /* 935 * nfs readlink call 936 */ 937 static int 938 nfs_readlink(struct vop_readlink_args *ap) 939 { 940 struct vnode *vp = ap->a_vp; 941 942 if (vp->v_type != VLNK) 943 return (EINVAL); 944 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred)); 945 } 946 947 /* 948 * Do a readlink rpc. 949 * Called by nfs_doio() from below the buffer cache. 950 */ 951 int 952 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 953 { 954 caddr_t bpos, dpos; 955 int error = 0, len, attrflag; 956 struct mbuf *mreq, *mrep, *md, *mb; 957 int v3 = NFS_ISV3(vp); 958 959 nfsstats.rpccnt[NFSPROC_READLINK]++; 960 mreq = nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 961 mb = mreq; 962 bpos = mtod(mb, caddr_t); 963 nfsm_fhtom(vp, v3); 964 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred); 965 if (v3) 966 nfsm_postop_attr(vp, attrflag); 967 if (!error) { 968 nfsm_strsiz(len, NFS_MAXPATHLEN); 969 if (len == NFS_MAXPATHLEN) { 970 struct nfsnode *np = VTONFS(vp); 971 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 972 len = np->n_size; 973 } 974 nfsm_mtouio(uiop, len); 975 } 976 m_freem(mrep); 977 nfsmout: 978 return (error); 979 } 980 981 /* 982 * nfs read rpc call 983 * Ditto above 984 */ 985 int 986 nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 987 { 988 u_int32_t *tl; 989 caddr_t bpos, dpos; 990 struct mbuf *mreq, *mrep, *md, *mb; 991 struct nfsmount *nmp; 992 int error = 0, len, retlen, tsiz, eof, attrflag; 993 int v3 = NFS_ISV3(vp); 994 995 #ifndef nolint 996 eof = 0; 997 #endif 998 nmp = VFSTONFS(vp->v_mount); 999 tsiz = uiop->uio_resid; 1000 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1001 return (EFBIG); 1002 while (tsiz > 0) { 1003 nfsstats.rpccnt[NFSPROC_READ]++; 1004 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1005 mreq = nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1006 mb = mreq; 1007 bpos = mtod(mb, caddr_t); 1008 nfsm_fhtom(vp, v3); 1009 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3); 1010 if (v3) { 1011 txdr_hyper(uiop->uio_offset, tl); 1012 *(tl + 2) = txdr_unsigned(len); 1013 } else { 1014 *tl++ = txdr_unsigned(uiop->uio_offset); 1015 *tl++ = txdr_unsigned(len); 1016 *tl = 0; 1017 } 1018 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred); 1019 if (v3) { 1020 nfsm_postop_attr(vp, attrflag); 1021 if (error) { 1022 m_freem(mrep); 1023 goto nfsmout; 1024 } 1025 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED); 1026 eof = fxdr_unsigned(int, *(tl + 1)); 1027 } else 1028 nfsm_loadattr(vp, NULL); 1029 nfsm_strsiz(retlen, nmp->nm_rsize); 1030 nfsm_mtouio(uiop, retlen); 1031 m_freem(mrep); 1032 tsiz -= retlen; 1033 if (v3) { 1034 if (eof || retlen == 0) { 1035 tsiz = 0; 1036 } 1037 } else if (retlen < len) { 1038 tsiz = 0; 1039 } 1040 } 1041 nfsmout: 1042 return (error); 1043 } 1044 1045 /* 1046 * nfs write call 1047 */ 1048 int 1049 nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, 1050 int *iomode, int *must_commit) 1051 { 1052 u_int32_t *tl; 1053 int32_t backup; 1054 caddr_t bpos, dpos; 1055 struct mbuf *mreq, *mrep, *md, *mb; 1056 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1057 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1058 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1059 1060 #ifndef DIAGNOSTIC 1061 if (uiop->uio_iovcnt != 1) 1062 panic("nfs: writerpc iovcnt > 1"); 1063 #endif 1064 *must_commit = 0; 1065 tsiz = uiop->uio_resid; 1066 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1067 return (EFBIG); 1068 while (tsiz > 0) { 1069 nfsstats.rpccnt[NFSPROC_WRITE]++; 1070 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 1071 mreq = nfsm_reqhead(vp, NFSPROC_WRITE, 1072 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1073 mb = mreq; 1074 bpos = mtod(mb, caddr_t); 1075 nfsm_fhtom(vp, v3); 1076 if (v3) { 1077 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 1078 txdr_hyper(uiop->uio_offset, tl); 1079 tl += 2; 1080 *tl++ = txdr_unsigned(len); 1081 *tl++ = txdr_unsigned(*iomode); 1082 *tl = txdr_unsigned(len); 1083 } else { 1084 u_int32_t x; 1085 1086 tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED); 1087 /* Set both "begin" and "current" to non-garbage. */ 1088 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1089 *tl++ = x; /* "begin offset" */ 1090 *tl++ = x; /* "current offset" */ 1091 x = txdr_unsigned(len); 1092 *tl++ = x; /* total to this offset */ 1093 *tl = x; /* size of this write */ 1094 } 1095 nfsm_uiotom(uiop, len); 1096 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred); 1097 if (v3) { 1098 wccflag = NFSV3_WCCCHK; 1099 nfsm_wcc_data(vp, wccflag); 1100 if (!error) { 1101 tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED 1102 + NFSX_V3WRITEVERF); 1103 rlen = fxdr_unsigned(int, *tl++); 1104 if (rlen == 0) { 1105 error = NFSERR_IO; 1106 m_freem(mrep); 1107 break; 1108 } else if (rlen < len) { 1109 backup = len - rlen; 1110 uiop->uio_iov->iov_base = 1111 (char *)uiop->uio_iov->iov_base - 1112 backup; 1113 uiop->uio_iov->iov_len += backup; 1114 uiop->uio_offset -= backup; 1115 uiop->uio_resid += backup; 1116 len = rlen; 1117 } 1118 commit = fxdr_unsigned(int, *tl++); 1119 1120 /* 1121 * Return the lowest committment level 1122 * obtained by any of the RPCs. 1123 */ 1124 if (committed == NFSV3WRITE_FILESYNC) 1125 committed = commit; 1126 else if (committed == NFSV3WRITE_DATASYNC && 1127 commit == NFSV3WRITE_UNSTABLE) 1128 committed = commit; 1129 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1130 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1131 NFSX_V3WRITEVERF); 1132 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1133 } else if (bcmp((caddr_t)tl, 1134 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1135 *must_commit = 1; 1136 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1137 NFSX_V3WRITEVERF); 1138 } 1139 } 1140 } else 1141 nfsm_loadattr(vp, NULL); 1142 if (wccflag) 1143 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime; 1144 m_freem(mrep); 1145 if (error) 1146 break; 1147 tsiz -= len; 1148 } 1149 nfsmout: 1150 if (vp->v_mount->mnt_flag & MNT_ASYNC) 1151 committed = NFSV3WRITE_FILESYNC; 1152 *iomode = committed; 1153 if (error) 1154 uiop->uio_resid = tsiz; 1155 return (error); 1156 } 1157 1158 /* 1159 * nfs mknod rpc 1160 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1161 * mode set to specify the file type and the size field for rdev. 1162 */ 1163 static int 1164 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1165 struct vattr *vap) 1166 { 1167 struct nfsv2_sattr *sp; 1168 u_int32_t *tl; 1169 struct vnode *newvp = NULL; 1170 struct nfsnode *np = NULL; 1171 struct vattr vattr; 1172 caddr_t bpos, dpos; 1173 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1174 struct mbuf *mreq, *mrep, *md, *mb; 1175 u_int32_t rdev; 1176 int v3 = NFS_ISV3(dvp); 1177 1178 if (vap->va_type == VCHR || vap->va_type == VBLK) 1179 rdev = txdr_unsigned(vap->va_rdev); 1180 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1181 rdev = nfs_xdrneg1; 1182 else { 1183 return (EOPNOTSUPP); 1184 } 1185 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1186 return (error); 1187 } 1188 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1189 mreq = nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1190 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1191 mb = mreq; 1192 bpos = mtod(mb, caddr_t); 1193 nfsm_fhtom(dvp, v3); 1194 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1195 if (v3) { 1196 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1197 *tl++ = vtonfsv3_type(vap->va_type); 1198 nfsm_v3attrbuild(vap, FALSE); 1199 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1200 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 1201 *tl++ = txdr_unsigned(umajor(vap->va_rdev)); 1202 *tl = txdr_unsigned(uminor(vap->va_rdev)); 1203 } 1204 } else { 1205 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1206 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1207 sp->sa_uid = nfs_xdrneg1; 1208 sp->sa_gid = nfs_xdrneg1; 1209 sp->sa_size = rdev; 1210 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1211 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1212 } 1213 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred); 1214 if (!error) { 1215 nfsm_mtofh(dvp, newvp, v3, gotvp); 1216 if (!gotvp) { 1217 if (newvp) { 1218 vput(newvp); 1219 newvp = NULL; 1220 } 1221 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1222 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1223 if (!error) 1224 newvp = NFSTOV(np); 1225 } 1226 } 1227 if (v3) 1228 nfsm_wcc_data(dvp, wccflag); 1229 m_freem(mrep); 1230 nfsmout: 1231 if (error) { 1232 if (newvp) 1233 vput(newvp); 1234 } else { 1235 if (cnp->cn_flags & MAKEENTRY) 1236 cache_enter(dvp, newvp, cnp); 1237 *vpp = newvp; 1238 } 1239 VTONFS(dvp)->n_flag |= NMODIFIED; 1240 if (!wccflag) 1241 VTONFS(dvp)->n_attrstamp = 0; 1242 return (error); 1243 } 1244 1245 /* 1246 * nfs mknod vop 1247 * just call nfs_mknodrpc() to do the work. 1248 */ 1249 /* ARGSUSED */ 1250 static int 1251 nfs_mknod(struct vop_mknod_args *ap) 1252 { 1253 1254 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); 1255 } 1256 1257 static u_long create_verf; 1258 /* 1259 * nfs file create call 1260 */ 1261 static int 1262 nfs_create(struct vop_create_args *ap) 1263 { 1264 struct vnode *dvp = ap->a_dvp; 1265 struct vattr *vap = ap->a_vap; 1266 struct componentname *cnp = ap->a_cnp; 1267 struct nfsv2_sattr *sp; 1268 u_int32_t *tl; 1269 struct nfsnode *np = NULL; 1270 struct vnode *newvp = NULL; 1271 caddr_t bpos, dpos; 1272 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1273 struct mbuf *mreq, *mrep, *md, *mb; 1274 struct vattr vattr; 1275 int v3 = NFS_ISV3(dvp); 1276 1277 /* 1278 * Oops, not for me.. 1279 */ 1280 if (vap->va_type == VSOCK) 1281 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1282 1283 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1284 return (error); 1285 } 1286 if (vap->va_vaflags & VA_EXCLUSIVE) 1287 fmode |= O_EXCL; 1288 again: 1289 nfsstats.rpccnt[NFSPROC_CREATE]++; 1290 mreq = nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1291 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1292 mb = mreq; 1293 bpos = mtod(mb, caddr_t); 1294 nfsm_fhtom(dvp, v3); 1295 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1296 if (v3) { 1297 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); 1298 if (fmode & O_EXCL) { 1299 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1300 tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF); 1301 #ifdef INET 1302 if (!TAILQ_EMPTY(&in_ifaddrhead)) 1303 *tl++ = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr.s_addr; 1304 else 1305 #endif 1306 *tl++ = create_verf; 1307 *tl = ++create_verf; 1308 } else { 1309 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1310 nfsm_v3attrbuild(vap, FALSE); 1311 } 1312 } else { 1313 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1314 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1315 sp->sa_uid = nfs_xdrneg1; 1316 sp->sa_gid = nfs_xdrneg1; 1317 sp->sa_size = 0; 1318 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1319 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1320 } 1321 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred); 1322 if (!error) { 1323 nfsm_mtofh(dvp, newvp, v3, gotvp); 1324 if (!gotvp) { 1325 if (newvp) { 1326 vput(newvp); 1327 newvp = NULL; 1328 } 1329 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1330 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); 1331 if (!error) 1332 newvp = NFSTOV(np); 1333 } 1334 } 1335 if (v3) 1336 nfsm_wcc_data(dvp, wccflag); 1337 m_freem(mrep); 1338 nfsmout: 1339 if (error) { 1340 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1341 fmode &= ~O_EXCL; 1342 goto again; 1343 } 1344 if (newvp) 1345 vput(newvp); 1346 } else if (v3 && (fmode & O_EXCL)) { 1347 /* 1348 * We are normally called with only a partially initialized 1349 * VAP. Since the NFSv3 spec says that server may use the 1350 * file attributes to store the verifier, the spec requires 1351 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1352 * in atime, but we can't really assume that all servers will 1353 * so we ensure that our SETATTR sets both atime and mtime. 1354 */ 1355 if (vap->va_mtime.tv_sec == VNOVAL) 1356 vfs_timestamp(&vap->va_mtime); 1357 if (vap->va_atime.tv_sec == VNOVAL) 1358 vap->va_atime = vap->va_mtime; 1359 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_thread); 1360 if (error) 1361 vput(newvp); 1362 } 1363 if (!error) { 1364 if (cnp->cn_flags & MAKEENTRY) 1365 cache_enter(dvp, newvp, cnp); 1366 *ap->a_vpp = newvp; 1367 } 1368 VTONFS(dvp)->n_flag |= NMODIFIED; 1369 if (!wccflag) 1370 VTONFS(dvp)->n_attrstamp = 0; 1371 return (error); 1372 } 1373 1374 /* 1375 * nfs file remove call 1376 * To try and make nfs semantics closer to ufs semantics, a file that has 1377 * other processes using the vnode is renamed instead of removed and then 1378 * removed later on the last close. 1379 * - If v_usecount > 1 1380 * If a rename is not already in the works 1381 * call nfs_sillyrename() to set it up 1382 * else 1383 * do the remove rpc 1384 */ 1385 static int 1386 nfs_remove(struct vop_remove_args *ap) 1387 { 1388 struct vnode *vp = ap->a_vp; 1389 struct vnode *dvp = ap->a_dvp; 1390 struct componentname *cnp = ap->a_cnp; 1391 struct nfsnode *np = VTONFS(vp); 1392 int error = 0; 1393 struct vattr vattr; 1394 1395 #ifndef DIAGNOSTIC 1396 if ((cnp->cn_flags & HASBUF) == 0) 1397 panic("nfs_remove: no name"); 1398 if (vrefcnt(vp) < 1) 1399 panic("nfs_remove: bad v_usecount"); 1400 #endif 1401 if (vp->v_type == VDIR) 1402 error = EPERM; 1403 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1404 VOP_GETATTR(vp, &vattr, cnp->cn_cred, cnp->cn_thread) == 0 && 1405 vattr.va_nlink > 1)) { 1406 /* 1407 * Purge the name cache so that the chance of a lookup for 1408 * the name succeeding while the remove is in progress is 1409 * minimized. Without node locking it can still happen, such 1410 * that an I/O op returns ESTALE, but since you get this if 1411 * another host removes the file.. 1412 */ 1413 cache_purge(vp); 1414 /* 1415 * throw away biocache buffers, mainly to avoid 1416 * unnecessary delayed writes later. 1417 */ 1418 error = nfs_vinvalbuf(vp, 0, cnp->cn_thread, 1); 1419 /* Do the rpc */ 1420 if (error != EINTR && error != EIO) 1421 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1422 cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); 1423 /* 1424 * Kludge City: If the first reply to the remove rpc is lost.. 1425 * the reply to the retransmitted request will be ENOENT 1426 * since the file was in fact removed 1427 * Therefore, we cheat and return success. 1428 */ 1429 if (error == ENOENT) 1430 error = 0; 1431 } else if (!np->n_sillyrename) 1432 error = nfs_sillyrename(dvp, vp, cnp); 1433 np->n_attrstamp = 0; 1434 return (error); 1435 } 1436 1437 /* 1438 * nfs file remove rpc called from nfs_inactive 1439 */ 1440 int 1441 nfs_removeit(struct sillyrename *sp) 1442 { 1443 1444 /* 1445 * Make sure that the directory vnode is still valid. 1446 * XXX we should lock sp->s_dvp here. 1447 */ 1448 if (sp->s_dvp->v_type == VBAD) 1449 return (0); 1450 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1451 NULL)); 1452 } 1453 1454 /* 1455 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1456 */ 1457 static int 1458 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1459 struct ucred *cred, struct thread *td) 1460 { 1461 caddr_t bpos, dpos; 1462 int error = 0, wccflag = NFSV3_WCCRATTR; 1463 struct mbuf *mreq, *mrep, *md, *mb; 1464 int v3 = NFS_ISV3(dvp); 1465 1466 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1467 mreq = nfsm_reqhead(dvp, NFSPROC_REMOVE, 1468 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1469 mb = mreq; 1470 bpos = mtod(mb, caddr_t); 1471 nfsm_fhtom(dvp, v3); 1472 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1473 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1474 if (v3) 1475 nfsm_wcc_data(dvp, wccflag); 1476 m_freem(mrep); 1477 nfsmout: 1478 VTONFS(dvp)->n_flag |= NMODIFIED; 1479 if (!wccflag) 1480 VTONFS(dvp)->n_attrstamp = 0; 1481 return (error); 1482 } 1483 1484 /* 1485 * nfs file rename call 1486 */ 1487 static int 1488 nfs_rename(struct vop_rename_args *ap) 1489 { 1490 struct vnode *fvp = ap->a_fvp; 1491 struct vnode *tvp = ap->a_tvp; 1492 struct vnode *fdvp = ap->a_fdvp; 1493 struct vnode *tdvp = ap->a_tdvp; 1494 struct componentname *tcnp = ap->a_tcnp; 1495 struct componentname *fcnp = ap->a_fcnp; 1496 int error; 1497 1498 #ifndef DIAGNOSTIC 1499 if ((tcnp->cn_flags & HASBUF) == 0 || 1500 (fcnp->cn_flags & HASBUF) == 0) 1501 panic("nfs_rename: no name"); 1502 #endif 1503 /* Check for cross-device rename */ 1504 if ((fvp->v_mount != tdvp->v_mount) || 1505 (tvp && (fvp->v_mount != tvp->v_mount))) { 1506 error = EXDEV; 1507 goto out; 1508 } 1509 1510 if (fvp == tvp) { 1511 printf("nfs_rename: fvp == tvp (can't happen)\n"); 1512 error = 0; 1513 goto out; 1514 } 1515 if ((error = vn_lock(fvp, LK_EXCLUSIVE, fcnp->cn_thread)) != 0) 1516 goto out; 1517 1518 /* 1519 * We have to flush B_DELWRI data prior to renaming 1520 * the file. If we don't, the delayed-write buffers 1521 * can be flushed out later after the file has gone stale 1522 * under NFSV3. NFSV2 does not have this problem because 1523 * ( as far as I can tell ) it flushes dirty buffers more 1524 * often. 1525 * 1526 * Skip the rename operation if the fsync fails, this can happen 1527 * due to the server's volume being full, when we pushed out data 1528 * that was written back to our cache earlier. Not checking for 1529 * this condition can result in potential (silent) data loss. 1530 */ 1531 error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread); 1532 VOP_UNLOCK(fvp, 0, fcnp->cn_thread); 1533 if (!error && tvp) 1534 error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread); 1535 if (error) 1536 goto out; 1537 1538 /* 1539 * If the tvp exists and is in use, sillyrename it before doing the 1540 * rename of the new file over it. 1541 * XXX Can't sillyrename a directory. 1542 */ 1543 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1544 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1545 vput(tvp); 1546 tvp = NULL; 1547 } 1548 1549 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1550 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1551 tcnp->cn_thread); 1552 1553 if (fvp->v_type == VDIR) { 1554 if (tvp != NULL && tvp->v_type == VDIR) 1555 cache_purge(tdvp); 1556 cache_purge(fdvp); 1557 } 1558 1559 out: 1560 if (tdvp == tvp) 1561 vrele(tdvp); 1562 else 1563 vput(tdvp); 1564 if (tvp) 1565 vput(tvp); 1566 vrele(fdvp); 1567 vrele(fvp); 1568 /* 1569 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1570 */ 1571 if (error == ENOENT) 1572 error = 0; 1573 return (error); 1574 } 1575 1576 /* 1577 * nfs file rename rpc called from nfs_remove() above 1578 */ 1579 static int 1580 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 1581 struct sillyrename *sp) 1582 { 1583 1584 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp, 1585 sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread)); 1586 } 1587 1588 /* 1589 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1590 */ 1591 static int 1592 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 1593 struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred, 1594 struct thread *td) 1595 { 1596 caddr_t bpos, dpos; 1597 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1598 struct mbuf *mreq, *mrep, *md, *mb; 1599 int v3 = NFS_ISV3(fdvp); 1600 1601 nfsstats.rpccnt[NFSPROC_RENAME]++; 1602 mreq = nfsm_reqhead(fdvp, NFSPROC_RENAME, 1603 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1604 nfsm_rndup(tnamelen)); 1605 mb = mreq; 1606 bpos = mtod(mb, caddr_t); 1607 nfsm_fhtom(fdvp, v3); 1608 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1609 nfsm_fhtom(tdvp, v3); 1610 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1611 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1612 if (v3) { 1613 nfsm_wcc_data(fdvp, fwccflag); 1614 nfsm_wcc_data(tdvp, twccflag); 1615 } 1616 m_freem(mrep); 1617 nfsmout: 1618 VTONFS(fdvp)->n_flag |= NMODIFIED; 1619 VTONFS(tdvp)->n_flag |= NMODIFIED; 1620 if (!fwccflag) 1621 VTONFS(fdvp)->n_attrstamp = 0; 1622 if (!twccflag) 1623 VTONFS(tdvp)->n_attrstamp = 0; 1624 return (error); 1625 } 1626 1627 /* 1628 * nfs hard link create call 1629 */ 1630 static int 1631 nfs_link(struct vop_link_args *ap) 1632 { 1633 struct vnode *vp = ap->a_vp; 1634 struct vnode *tdvp = ap->a_tdvp; 1635 struct componentname *cnp = ap->a_cnp; 1636 caddr_t bpos, dpos; 1637 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1638 struct mbuf *mreq, *mrep, *md, *mb; 1639 int v3; 1640 1641 if (vp->v_mount != tdvp->v_mount) { 1642 return (EXDEV); 1643 } 1644 1645 /* 1646 * Push all writes to the server, so that the attribute cache 1647 * doesn't get "out of sync" with the server. 1648 * XXX There should be a better way! 1649 */ 1650 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread); 1651 1652 v3 = NFS_ISV3(vp); 1653 nfsstats.rpccnt[NFSPROC_LINK]++; 1654 mreq = nfsm_reqhead(vp, NFSPROC_LINK, 1655 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1656 mb = mreq; 1657 bpos = mtod(mb, caddr_t); 1658 nfsm_fhtom(vp, v3); 1659 nfsm_fhtom(tdvp, v3); 1660 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1661 nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred); 1662 if (v3) { 1663 nfsm_postop_attr(vp, attrflag); 1664 nfsm_wcc_data(tdvp, wccflag); 1665 } 1666 m_freem(mrep); 1667 nfsmout: 1668 VTONFS(tdvp)->n_flag |= NMODIFIED; 1669 if (!attrflag) 1670 VTONFS(vp)->n_attrstamp = 0; 1671 if (!wccflag) 1672 VTONFS(tdvp)->n_attrstamp = 0; 1673 /* 1674 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 1675 */ 1676 if (error == EEXIST) 1677 error = 0; 1678 return (error); 1679 } 1680 1681 /* 1682 * nfs symbolic link create call 1683 */ 1684 static int 1685 nfs_symlink(struct vop_symlink_args *ap) 1686 { 1687 struct vnode *dvp = ap->a_dvp; 1688 struct vattr *vap = ap->a_vap; 1689 struct componentname *cnp = ap->a_cnp; 1690 struct nfsv2_sattr *sp; 1691 caddr_t bpos, dpos; 1692 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 1693 struct mbuf *mreq, *mrep, *md, *mb; 1694 struct vnode *newvp = NULL; 1695 int v3 = NFS_ISV3(dvp); 1696 1697 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 1698 slen = strlen(ap->a_target); 1699 mreq = nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 1700 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 1701 mb = mreq; 1702 bpos = mtod(mb, caddr_t); 1703 nfsm_fhtom(dvp, v3); 1704 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1705 if (v3) { 1706 nfsm_v3attrbuild(vap, FALSE); 1707 } 1708 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 1709 if (!v3) { 1710 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1711 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 1712 sp->sa_uid = nfs_xdrneg1; 1713 sp->sa_gid = nfs_xdrneg1; 1714 sp->sa_size = nfs_xdrneg1; 1715 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1716 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1717 } 1718 1719 /* 1720 * Issue the NFS request and get the rpc response. 1721 * 1722 * Only NFSv3 responses returning an error of 0 actually return 1723 * a file handle that can be converted into newvp without having 1724 * to do an extra lookup rpc. 1725 */ 1726 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred); 1727 if (v3) { 1728 if (error == 0) 1729 nfsm_mtofh(dvp, newvp, v3, gotvp); 1730 nfsm_wcc_data(dvp, wccflag); 1731 } 1732 1733 /* 1734 * out code jumps -> here, mrep is also freed. 1735 */ 1736 1737 m_freem(mrep); 1738 nfsmout: 1739 1740 /* 1741 * If we get an EEXIST error, silently convert it to no-error 1742 * in case of an NFS retry. 1743 */ 1744 if (error == EEXIST) 1745 error = 0; 1746 1747 /* 1748 * If we do not have (or no longer have) an error, and we could 1749 * not extract the newvp from the response due to the request being 1750 * NFSv2 or the error being EEXIST. We have to do a lookup in order 1751 * to obtain a newvp to return. 1752 */ 1753 if (error == 0 && newvp == NULL) { 1754 struct nfsnode *np = NULL; 1755 1756 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1757 cnp->cn_cred, cnp->cn_thread, &np); 1758 if (!error) 1759 newvp = NFSTOV(np); 1760 } 1761 if (error) { 1762 if (newvp) 1763 vput(newvp); 1764 } else { 1765 *ap->a_vpp = newvp; 1766 } 1767 VTONFS(dvp)->n_flag |= NMODIFIED; 1768 if (!wccflag) 1769 VTONFS(dvp)->n_attrstamp = 0; 1770 return (error); 1771 } 1772 1773 /* 1774 * nfs make dir call 1775 */ 1776 static int 1777 nfs_mkdir(struct vop_mkdir_args *ap) 1778 { 1779 struct vnode *dvp = ap->a_dvp; 1780 struct vattr *vap = ap->a_vap; 1781 struct componentname *cnp = ap->a_cnp; 1782 struct nfsv2_sattr *sp; 1783 int len; 1784 struct nfsnode *np = NULL; 1785 struct vnode *newvp = NULL; 1786 caddr_t bpos, dpos; 1787 int error = 0, wccflag = NFSV3_WCCRATTR; 1788 int gotvp = 0; 1789 struct mbuf *mreq, *mrep, *md, *mb; 1790 struct vattr vattr; 1791 int v3 = NFS_ISV3(dvp); 1792 1793 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0) { 1794 return (error); 1795 } 1796 len = cnp->cn_namelen; 1797 nfsstats.rpccnt[NFSPROC_MKDIR]++; 1798 mreq = nfsm_reqhead(dvp, NFSPROC_MKDIR, 1799 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 1800 mb = mreq; 1801 bpos = mtod(mb, caddr_t); 1802 nfsm_fhtom(dvp, v3); 1803 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1804 if (v3) { 1805 nfsm_v3attrbuild(vap, FALSE); 1806 } else { 1807 sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); 1808 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 1809 sp->sa_uid = nfs_xdrneg1; 1810 sp->sa_gid = nfs_xdrneg1; 1811 sp->sa_size = nfs_xdrneg1; 1812 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1813 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1814 } 1815 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred); 1816 if (!error) 1817 nfsm_mtofh(dvp, newvp, v3, gotvp); 1818 if (v3) 1819 nfsm_wcc_data(dvp, wccflag); 1820 m_freem(mrep); 1821 nfsmout: 1822 VTONFS(dvp)->n_flag |= NMODIFIED; 1823 if (!wccflag) 1824 VTONFS(dvp)->n_attrstamp = 0; 1825 /* 1826 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 1827 * if we can succeed in looking up the directory. 1828 */ 1829 if (error == EEXIST || (!error && !gotvp)) { 1830 if (newvp) { 1831 vput(newvp); 1832 newvp = NULL; 1833 } 1834 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 1835 cnp->cn_thread, &np); 1836 if (!error) { 1837 newvp = NFSTOV(np); 1838 if (newvp->v_type != VDIR) 1839 error = EEXIST; 1840 } 1841 } 1842 if (error) { 1843 if (newvp) 1844 vput(newvp); 1845 } else 1846 *ap->a_vpp = newvp; 1847 return (error); 1848 } 1849 1850 /* 1851 * nfs remove directory call 1852 */ 1853 static int 1854 nfs_rmdir(struct vop_rmdir_args *ap) 1855 { 1856 struct vnode *vp = ap->a_vp; 1857 struct vnode *dvp = ap->a_dvp; 1858 struct componentname *cnp = ap->a_cnp; 1859 caddr_t bpos, dpos; 1860 int error = 0, wccflag = NFSV3_WCCRATTR; 1861 struct mbuf *mreq, *mrep, *md, *mb; 1862 int v3 = NFS_ISV3(dvp); 1863 1864 if (dvp == vp) 1865 return (EINVAL); 1866 nfsstats.rpccnt[NFSPROC_RMDIR]++; 1867 mreq = nfsm_reqhead(dvp, NFSPROC_RMDIR, 1868 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1869 mb = mreq; 1870 bpos = mtod(mb, caddr_t); 1871 nfsm_fhtom(dvp, v3); 1872 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1873 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred); 1874 if (v3) 1875 nfsm_wcc_data(dvp, wccflag); 1876 m_freem(mrep); 1877 nfsmout: 1878 VTONFS(dvp)->n_flag |= NMODIFIED; 1879 if (!wccflag) 1880 VTONFS(dvp)->n_attrstamp = 0; 1881 cache_purge(dvp); 1882 cache_purge(vp); 1883 /* 1884 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 1885 */ 1886 if (error == ENOENT) 1887 error = 0; 1888 return (error); 1889 } 1890 1891 /* 1892 * nfs readdir call 1893 */ 1894 static int 1895 nfs_readdir(struct vop_readdir_args *ap) 1896 { 1897 struct vnode *vp = ap->a_vp; 1898 struct nfsnode *np = VTONFS(vp); 1899 struct uio *uio = ap->a_uio; 1900 int tresid, error; 1901 struct vattr vattr; 1902 1903 if (vp->v_type != VDIR) 1904 return (EPERM); 1905 /* 1906 * First, check for hit on the EOF offset cache 1907 */ 1908 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 1909 (np->n_flag & NMODIFIED) == 0) { 1910 if (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_td) == 0 && 1911 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { 1912 nfsstats.direofcache_hits++; 1913 return (0); 1914 } 1915 } 1916 1917 /* 1918 * Call nfs_bioread() to do the real work. 1919 */ 1920 tresid = uio->uio_resid; 1921 error = nfs_bioread(vp, uio, 0, ap->a_cred); 1922 1923 if (!error && uio->uio_resid == tresid) 1924 nfsstats.direofcache_misses++; 1925 return (error); 1926 } 1927 1928 /* 1929 * Readdir rpc call. 1930 * Called from below the buffer cache by nfs_doio(). 1931 */ 1932 int 1933 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 1934 { 1935 int len, left; 1936 struct dirent *dp = NULL; 1937 u_int32_t *tl; 1938 caddr_t cp; 1939 nfsuint64 *cookiep; 1940 caddr_t bpos, dpos; 1941 struct mbuf *mreq, *mrep, *md, *mb; 1942 nfsuint64 cookie; 1943 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1944 struct nfsnode *dnp = VTONFS(vp); 1945 u_quad_t fileno; 1946 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 1947 int attrflag; 1948 int v3 = NFS_ISV3(vp); 1949 1950 #ifndef DIAGNOSTIC 1951 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 1952 (uiop->uio_resid & (DIRBLKSIZ - 1))) 1953 panic("nfs readdirrpc bad uio"); 1954 #endif 1955 1956 /* 1957 * If there is no cookie, assume directory was stale. 1958 */ 1959 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 1960 if (cookiep) 1961 cookie = *cookiep; 1962 else 1963 return (NFSERR_BAD_COOKIE); 1964 /* 1965 * Loop around doing readdir rpc's of size nm_readdirsize 1966 * truncated to a multiple of DIRBLKSIZ. 1967 * The stopping criteria is EOF or buffer full. 1968 */ 1969 while (more_dirs && bigenough) { 1970 nfsstats.rpccnt[NFSPROC_READDIR]++; 1971 mreq = nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 1972 NFSX_READDIR(v3)); 1973 mb = mreq; 1974 bpos = mtod(mb, caddr_t); 1975 nfsm_fhtom(vp, v3); 1976 if (v3) { 1977 tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); 1978 *tl++ = cookie.nfsuquad[0]; 1979 *tl++ = cookie.nfsuquad[1]; 1980 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 1981 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 1982 } else { 1983 tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); 1984 *tl++ = cookie.nfsuquad[0]; 1985 } 1986 *tl = txdr_unsigned(nmp->nm_readdirsize); 1987 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred); 1988 if (v3) { 1989 nfsm_postop_attr(vp, attrflag); 1990 if (!error) { 1991 tl = nfsm_dissect(u_int32_t *, 1992 2 * NFSX_UNSIGNED); 1993 dnp->n_cookieverf.nfsuquad[0] = *tl++; 1994 dnp->n_cookieverf.nfsuquad[1] = *tl; 1995 } else { 1996 m_freem(mrep); 1997 goto nfsmout; 1998 } 1999 } 2000 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2001 more_dirs = fxdr_unsigned(int, *tl); 2002 2003 /* loop thru the dir entries, doctoring them to 4bsd form */ 2004 while (more_dirs && bigenough) { 2005 if (v3) { 2006 tl = nfsm_dissect(u_int32_t *, 2007 3 * NFSX_UNSIGNED); 2008 fileno = fxdr_hyper(tl); 2009 len = fxdr_unsigned(int, *(tl + 2)); 2010 } else { 2011 tl = nfsm_dissect(u_int32_t *, 2012 2 * NFSX_UNSIGNED); 2013 fileno = fxdr_unsigned(u_quad_t, *tl++); 2014 len = fxdr_unsigned(int, *tl); 2015 } 2016 if (len <= 0 || len > NFS_MAXNAMLEN) { 2017 error = EBADRPC; 2018 m_freem(mrep); 2019 goto nfsmout; 2020 } 2021 tlen = nfsm_rndup(len); 2022 if (tlen == len) 2023 tlen += 4; /* To ensure null termination */ 2024 left = DIRBLKSIZ - blksiz; 2025 if ((tlen + DIRHDSIZ) > left) { 2026 dp->d_reclen += left; 2027 uiop->uio_iov->iov_base = 2028 (char *)uiop->uio_iov->iov_base + left; 2029 uiop->uio_iov->iov_len -= left; 2030 uiop->uio_offset += left; 2031 uiop->uio_resid -= left; 2032 blksiz = 0; 2033 } 2034 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2035 bigenough = 0; 2036 if (bigenough) { 2037 dp = (struct dirent *)uiop->uio_iov->iov_base; 2038 dp->d_fileno = (int)fileno; 2039 dp->d_namlen = len; 2040 dp->d_reclen = tlen + DIRHDSIZ; 2041 dp->d_type = DT_UNKNOWN; 2042 blksiz += dp->d_reclen; 2043 if (blksiz == DIRBLKSIZ) 2044 blksiz = 0; 2045 uiop->uio_offset += DIRHDSIZ; 2046 uiop->uio_resid -= DIRHDSIZ; 2047 uiop->uio_iov->iov_base = 2048 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2049 uiop->uio_iov->iov_len -= DIRHDSIZ; 2050 nfsm_mtouio(uiop, len); 2051 cp = uiop->uio_iov->iov_base; 2052 tlen -= len; 2053 *cp = '\0'; /* null terminate */ 2054 uiop->uio_iov->iov_base = 2055 (char *)uiop->uio_iov->iov_base + tlen; 2056 uiop->uio_iov->iov_len -= tlen; 2057 uiop->uio_offset += tlen; 2058 uiop->uio_resid -= tlen; 2059 } else 2060 nfsm_adv(nfsm_rndup(len)); 2061 if (v3) { 2062 tl = nfsm_dissect(u_int32_t *, 2063 3 * NFSX_UNSIGNED); 2064 } else { 2065 tl = nfsm_dissect(u_int32_t *, 2066 2 * NFSX_UNSIGNED); 2067 } 2068 if (bigenough) { 2069 cookie.nfsuquad[0] = *tl++; 2070 if (v3) 2071 cookie.nfsuquad[1] = *tl++; 2072 } else if (v3) 2073 tl += 2; 2074 else 2075 tl++; 2076 more_dirs = fxdr_unsigned(int, *tl); 2077 } 2078 /* 2079 * If at end of rpc data, get the eof boolean 2080 */ 2081 if (!more_dirs) { 2082 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2083 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2084 } 2085 m_freem(mrep); 2086 } 2087 /* 2088 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2089 * by increasing d_reclen for the last record. 2090 */ 2091 if (blksiz > 0) { 2092 left = DIRBLKSIZ - blksiz; 2093 dp->d_reclen += left; 2094 uiop->uio_iov->iov_base = 2095 (char *)uiop->uio_iov->iov_base + left; 2096 uiop->uio_iov->iov_len -= left; 2097 uiop->uio_offset += left; 2098 uiop->uio_resid -= left; 2099 } 2100 2101 /* 2102 * We are now either at the end of the directory or have filled the 2103 * block. 2104 */ 2105 if (bigenough) 2106 dnp->n_direofoffset = uiop->uio_offset; 2107 else { 2108 if (uiop->uio_resid > 0) 2109 printf("EEK! readdirrpc resid > 0\n"); 2110 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2111 *cookiep = cookie; 2112 } 2113 nfsmout: 2114 return (error); 2115 } 2116 2117 /* 2118 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2119 */ 2120 int 2121 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) 2122 { 2123 int len, left; 2124 struct dirent *dp; 2125 u_int32_t *tl; 2126 caddr_t cp; 2127 struct vnode *newvp; 2128 nfsuint64 *cookiep; 2129 caddr_t bpos, dpos, dpossav1, dpossav2; 2130 struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2; 2131 struct nameidata nami, *ndp = &nami; 2132 struct componentname *cnp = &ndp->ni_cnd; 2133 nfsuint64 cookie; 2134 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2135 struct nfsnode *dnp = VTONFS(vp), *np; 2136 nfsfh_t *fhp; 2137 u_quad_t fileno; 2138 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2139 int attrflag, fhsize; 2140 2141 #ifndef nolint 2142 dp = NULL; 2143 #endif 2144 #ifndef DIAGNOSTIC 2145 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2146 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2147 panic("nfs readdirplusrpc bad uio"); 2148 #endif 2149 ndp->ni_dvp = vp; 2150 newvp = NULLVP; 2151 2152 /* 2153 * If there is no cookie, assume directory was stale. 2154 */ 2155 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2156 if (cookiep) 2157 cookie = *cookiep; 2158 else 2159 return (NFSERR_BAD_COOKIE); 2160 /* 2161 * Loop around doing readdir rpc's of size nm_readdirsize 2162 * truncated to a multiple of DIRBLKSIZ. 2163 * The stopping criteria is EOF or buffer full. 2164 */ 2165 while (more_dirs && bigenough) { 2166 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2167 mreq = nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2168 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2169 mb = mreq; 2170 bpos = mtod(mb, caddr_t); 2171 nfsm_fhtom(vp, 1); 2172 tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED); 2173 *tl++ = cookie.nfsuquad[0]; 2174 *tl++ = cookie.nfsuquad[1]; 2175 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2176 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2177 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2178 *tl = txdr_unsigned(nmp->nm_rsize); 2179 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred); 2180 nfsm_postop_attr(vp, attrflag); 2181 if (error) { 2182 m_freem(mrep); 2183 goto nfsmout; 2184 } 2185 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2186 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2187 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2188 more_dirs = fxdr_unsigned(int, *tl); 2189 2190 /* loop thru the dir entries, doctoring them to 4bsd form */ 2191 while (more_dirs && bigenough) { 2192 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2193 fileno = fxdr_hyper(tl); 2194 len = fxdr_unsigned(int, *(tl + 2)); 2195 if (len <= 0 || len > NFS_MAXNAMLEN) { 2196 error = EBADRPC; 2197 m_freem(mrep); 2198 goto nfsmout; 2199 } 2200 tlen = nfsm_rndup(len); 2201 if (tlen == len) 2202 tlen += 4; /* To ensure null termination*/ 2203 left = DIRBLKSIZ - blksiz; 2204 if ((tlen + DIRHDSIZ) > left) { 2205 dp->d_reclen += left; 2206 uiop->uio_iov->iov_base = 2207 (char *)uiop->uio_iov->iov_base + left; 2208 uiop->uio_iov->iov_len -= left; 2209 uiop->uio_offset += left; 2210 uiop->uio_resid -= left; 2211 blksiz = 0; 2212 } 2213 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2214 bigenough = 0; 2215 if (bigenough) { 2216 dp = (struct dirent *)uiop->uio_iov->iov_base; 2217 dp->d_fileno = (int)fileno; 2218 dp->d_namlen = len; 2219 dp->d_reclen = tlen + DIRHDSIZ; 2220 dp->d_type = DT_UNKNOWN; 2221 blksiz += dp->d_reclen; 2222 if (blksiz == DIRBLKSIZ) 2223 blksiz = 0; 2224 uiop->uio_offset += DIRHDSIZ; 2225 uiop->uio_resid -= DIRHDSIZ; 2226 uiop->uio_iov->iov_base = 2227 (char *)uiop->uio_iov->iov_base + DIRHDSIZ; 2228 uiop->uio_iov->iov_len -= DIRHDSIZ; 2229 cnp->cn_nameptr = uiop->uio_iov->iov_base; 2230 cnp->cn_namelen = len; 2231 nfsm_mtouio(uiop, len); 2232 cp = uiop->uio_iov->iov_base; 2233 tlen -= len; 2234 *cp = '\0'; 2235 uiop->uio_iov->iov_base = 2236 (char *)uiop->uio_iov->iov_base + tlen; 2237 uiop->uio_iov->iov_len -= tlen; 2238 uiop->uio_offset += tlen; 2239 uiop->uio_resid -= tlen; 2240 } else 2241 nfsm_adv(nfsm_rndup(len)); 2242 tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); 2243 if (bigenough) { 2244 cookie.nfsuquad[0] = *tl++; 2245 cookie.nfsuquad[1] = *tl++; 2246 } else 2247 tl += 2; 2248 2249 /* 2250 * Since the attributes are before the file handle 2251 * (sigh), we must skip over the attributes and then 2252 * come back and get them. 2253 */ 2254 attrflag = fxdr_unsigned(int, *tl); 2255 if (attrflag) { 2256 dpossav1 = dpos; 2257 mdsav1 = md; 2258 nfsm_adv(NFSX_V3FATTR); 2259 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2260 doit = fxdr_unsigned(int, *tl); 2261 /* 2262 * Skip loading the attrs for "..". There's a 2263 * race between loading the attrs here and 2264 * lookups that look for the directory currently 2265 * being read (in the parent). We try to acquire 2266 * the exclusive lock on ".." here, owning the 2267 * lock on the directory being read. Lookup will 2268 * hold the lock on ".." and try to acquire the 2269 * lock on the directory being read. 2270 * 2271 * There are other ways of fixing this, one would 2272 * be to do a trylock on the ".." vnode and skip 2273 * loading the attrs on ".." if it happens to be 2274 * locked by another process. But skipping the 2275 * attrload on ".." seems the easiest option. 2276 */ 2277 if (strcmp(dp->d_name, "..") == 0) { 2278 doit = 0; 2279 /* 2280 * We've already skipped over the attrs, 2281 * skip over the filehandle. And store d_type 2282 * as VDIR. 2283 */ 2284 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2285 i = fxdr_unsigned(int, *tl); 2286 nfsm_adv(nfsm_rndup(i)); 2287 dp->d_type = IFTODT(VTTOIF(VDIR)); 2288 } 2289 if (doit) { 2290 nfsm_getfh(fhp, fhsize, 1); 2291 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2292 VREF(vp); 2293 newvp = vp; 2294 np = dnp; 2295 } else { 2296 error = nfs_nget(vp->v_mount, fhp, 2297 fhsize, &np, LK_EXCLUSIVE); 2298 if (error) 2299 doit = 0; 2300 else 2301 newvp = NFSTOV(np); 2302 } 2303 } 2304 if (doit && bigenough) { 2305 dpossav2 = dpos; 2306 dpos = dpossav1; 2307 mdsav2 = md; 2308 md = mdsav1; 2309 nfsm_loadattr(newvp, NULL); 2310 dpos = dpossav2; 2311 md = mdsav2; 2312 dp->d_type = 2313 IFTODT(VTTOIF(np->n_vattr.va_type)); 2314 ndp->ni_vp = newvp; 2315 /* Update n_ctime, so subsequent lookup doesn't purge entry */ 2316 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 2317 cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp); 2318 } 2319 } else { 2320 /* Just skip over the file handle */ 2321 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2322 i = fxdr_unsigned(int, *tl); 2323 if (i) { 2324 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2325 fhsize = fxdr_unsigned(int, *tl); 2326 nfsm_adv(nfsm_rndup(fhsize)); 2327 } 2328 } 2329 if (newvp != NULLVP) { 2330 if (newvp == vp) 2331 vrele(newvp); 2332 else 2333 vput(newvp); 2334 newvp = NULLVP; 2335 } 2336 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2337 more_dirs = fxdr_unsigned(int, *tl); 2338 } 2339 /* 2340 * If at end of rpc data, get the eof boolean 2341 */ 2342 if (!more_dirs) { 2343 tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); 2344 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2345 } 2346 m_freem(mrep); 2347 } 2348 /* 2349 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2350 * by increasing d_reclen for the last record. 2351 */ 2352 if (blksiz > 0) { 2353 left = DIRBLKSIZ - blksiz; 2354 dp->d_reclen += left; 2355 uiop->uio_iov->iov_base = 2356 (char *)uiop->uio_iov->iov_base + left; 2357 uiop->uio_iov->iov_len -= left; 2358 uiop->uio_offset += left; 2359 uiop->uio_resid -= left; 2360 } 2361 2362 /* 2363 * We are now either at the end of the directory or have filled the 2364 * block. 2365 */ 2366 if (bigenough) 2367 dnp->n_direofoffset = uiop->uio_offset; 2368 else { 2369 if (uiop->uio_resid > 0) 2370 printf("EEK! readdirplusrpc resid > 0\n"); 2371 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2372 *cookiep = cookie; 2373 } 2374 nfsmout: 2375 if (newvp != NULLVP) { 2376 if (newvp == vp) 2377 vrele(newvp); 2378 else 2379 vput(newvp); 2380 newvp = NULLVP; 2381 } 2382 return (error); 2383 } 2384 2385 /* 2386 * Silly rename. To make the NFS filesystem that is stateless look a little 2387 * more like the "ufs" a remove of an active vnode is translated to a rename 2388 * to a funny looking filename that is removed by nfs_inactive on the 2389 * nfsnode. There is the potential for another process on a different client 2390 * to create the same funny name between the nfs_lookitup() fails and the 2391 * nfs_rename() completes, but... 2392 */ 2393 static int 2394 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2395 { 2396 struct sillyrename *sp; 2397 struct nfsnode *np; 2398 int error; 2399 short pid; 2400 unsigned int lticks; 2401 2402 cache_purge(dvp); 2403 np = VTONFS(vp); 2404 #ifndef DIAGNOSTIC 2405 if (vp->v_type == VDIR) 2406 panic("nfs: sillyrename dir"); 2407 #endif 2408 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2409 M_NFSREQ, M_WAITOK); 2410 sp->s_cred = crhold(cnp->cn_cred); 2411 sp->s_dvp = dvp; 2412 sp->s_removeit = nfs_removeit; 2413 VREF(dvp); 2414 2415 /* 2416 * Fudge together a funny name. 2417 * Changing the format of the funny name to accomodate more 2418 * sillynames per directory. 2419 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is 2420 * CPU ticks since boot. 2421 */ 2422 pid = cnp->cn_thread->td_proc->p_pid; 2423 lticks = (unsigned int)ticks; 2424 for ( ; ; ) { 2425 sp->s_namlen = sprintf(sp->s_name, 2426 ".nfs.%08x.%04x4.4", lticks, 2427 pid); 2428 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2429 cnp->cn_thread, NULL)) 2430 break; 2431 lticks++; 2432 } 2433 error = nfs_renameit(dvp, cnp, sp); 2434 if (error) 2435 goto bad; 2436 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2437 cnp->cn_thread, &np); 2438 np->n_sillyrename = sp; 2439 return (0); 2440 bad: 2441 vrele(sp->s_dvp); 2442 crfree(sp->s_cred); 2443 free((caddr_t)sp, M_NFSREQ); 2444 return (error); 2445 } 2446 2447 /* 2448 * Look up a file name and optionally either update the file handle or 2449 * allocate an nfsnode, depending on the value of npp. 2450 * npp == NULL --> just do the lookup 2451 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2452 * handled too 2453 * *npp != NULL --> update the file handle in the vnode 2454 */ 2455 static int 2456 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2457 struct thread *td, struct nfsnode **npp) 2458 { 2459 struct vnode *newvp = NULL; 2460 struct nfsnode *np, *dnp = VTONFS(dvp); 2461 caddr_t bpos, dpos; 2462 int error = 0, fhlen, attrflag; 2463 struct mbuf *mreq, *mrep, *md, *mb; 2464 nfsfh_t *nfhp; 2465 int v3 = NFS_ISV3(dvp); 2466 2467 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2468 mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2469 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2470 mb = mreq; 2471 bpos = mtod(mb, caddr_t); 2472 nfsm_fhtom(dvp, v3); 2473 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2474 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2475 if (npp && !error) { 2476 nfsm_getfh(nfhp, fhlen, v3); 2477 if (*npp) { 2478 np = *npp; 2479 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2480 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2481 np->n_fhp = &np->n_fh; 2482 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2483 np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK); 2484 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2485 np->n_fhsize = fhlen; 2486 newvp = NFSTOV(np); 2487 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2488 VREF(dvp); 2489 newvp = dvp; 2490 } else { 2491 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, LK_EXCLUSIVE); 2492 if (error) { 2493 m_freem(mrep); 2494 return (error); 2495 } 2496 newvp = NFSTOV(np); 2497 } 2498 if (v3) { 2499 nfsm_postop_attr(newvp, attrflag); 2500 if (!attrflag && *npp == NULL) { 2501 m_freem(mrep); 2502 if (newvp == dvp) 2503 vrele(newvp); 2504 else 2505 vput(newvp); 2506 return (ENOENT); 2507 } 2508 } else 2509 nfsm_loadattr(newvp, NULL); 2510 } 2511 m_freem(mrep); 2512 nfsmout: 2513 if (npp && *npp == NULL) { 2514 if (error) { 2515 if (newvp) { 2516 if (newvp == dvp) 2517 vrele(newvp); 2518 else 2519 vput(newvp); 2520 } 2521 } else 2522 *npp = np; 2523 } 2524 return (error); 2525 } 2526 2527 /* 2528 * Nfs Version 3 commit rpc 2529 */ 2530 int 2531 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, 2532 struct thread *td) 2533 { 2534 u_int32_t *tl; 2535 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2536 caddr_t bpos, dpos; 2537 int error = 0, wccflag = NFSV3_WCCRATTR; 2538 struct mbuf *mreq, *mrep, *md, *mb; 2539 2540 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 2541 return (0); 2542 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2543 mreq = nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2544 mb = mreq; 2545 bpos = mtod(mb, caddr_t); 2546 nfsm_fhtom(vp, 1); 2547 tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED); 2548 txdr_hyper(offset, tl); 2549 tl += 2; 2550 *tl = txdr_unsigned(cnt); 2551 nfsm_request(vp, NFSPROC_COMMIT, td, cred); 2552 nfsm_wcc_data(vp, wccflag); 2553 if (!error) { 2554 tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF); 2555 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2556 NFSX_V3WRITEVERF)) { 2557 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2558 NFSX_V3WRITEVERF); 2559 error = NFSERR_STALEWRITEVERF; 2560 } 2561 } 2562 m_freem(mrep); 2563 nfsmout: 2564 return (error); 2565 } 2566 2567 /* 2568 * Strategy routine. 2569 * For async requests when nfsiod(s) are running, queue the request by 2570 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2571 * request. 2572 */ 2573 static int 2574 nfs_strategy(struct vop_strategy_args *ap) 2575 { 2576 struct buf *bp = ap->a_bp; 2577 struct ucred *cr; 2578 2579 KASSERT(!(bp->b_flags & B_DONE), ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2580 KASSERT(BUF_REFCNT(bp) > 0, ("nfs_strategy: buffer %p not locked", bp)); 2581 2582 if (bp->b_iocmd == BIO_READ) 2583 cr = bp->b_rcred; 2584 else 2585 cr = bp->b_wcred; 2586 2587 /* 2588 * If the op is asynchronous and an i/o daemon is waiting 2589 * queue the request, wake it up and wait for completion 2590 * otherwise just do it ourselves. 2591 */ 2592 if ((bp->b_flags & B_ASYNC) == 0 || 2593 nfs_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread)) 2594 (void)nfs_doio(ap->a_vp, bp, cr, curthread); 2595 return (0); 2596 } 2597 2598 /* 2599 * fsync vnode op. Just call nfs_flush() with commit == 1. 2600 */ 2601 /* ARGSUSED */ 2602 static int 2603 nfs_fsync(struct vop_fsync_args *ap) 2604 { 2605 2606 return (nfs_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1)); 2607 } 2608 2609 /* 2610 * Flush all the blocks associated with a vnode. 2611 * Walk through the buffer pool and push any dirty pages 2612 * associated with the vnode. 2613 */ 2614 static int 2615 nfs_flush(struct vnode *vp, int waitfor, struct thread *td, 2616 int commit) 2617 { 2618 struct nfsnode *np = VTONFS(vp); 2619 struct buf *bp; 2620 int i; 2621 struct buf *nbp; 2622 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2623 int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2624 int passone = 1; 2625 u_quad_t off, endoff, toff; 2626 struct ucred* wcred = NULL; 2627 struct buf **bvec = NULL; 2628 #ifndef NFS_COMMITBVECSIZ 2629 #define NFS_COMMITBVECSIZ 20 2630 #endif 2631 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2632 int bvecsize = 0, bveccount; 2633 2634 if (nmp->nm_flag & NFSMNT_INT) 2635 slpflag = PCATCH; 2636 if (!commit) 2637 passone = 0; 2638 /* 2639 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2640 * server, but has not been committed to stable storage on the server 2641 * yet. On the first pass, the byte range is worked out and the commit 2642 * rpc is done. On the second pass, nfs_writebp() is called to do the 2643 * job. 2644 */ 2645 again: 2646 off = (u_quad_t)-1; 2647 endoff = 0; 2648 bvecpos = 0; 2649 if (NFS_ISV3(vp) && commit) { 2650 s = splbio(); 2651 if (bvec != NULL && bvec != bvec_on_stack) 2652 free(bvec, M_TEMP); 2653 /* 2654 * Count up how many buffers waiting for a commit. 2655 */ 2656 bveccount = 0; 2657 VI_LOCK(vp); 2658 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 2659 if (BUF_REFCNT(bp) == 0 && 2660 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2661 == (B_DELWRI | B_NEEDCOMMIT)) 2662 bveccount++; 2663 } 2664 /* 2665 * Allocate space to remember the list of bufs to commit. It is 2666 * important to use M_NOWAIT here to avoid a race with nfs_write. 2667 * If we can't get memory (for whatever reason), we will end up 2668 * committing the buffers one-by-one in the loop below. 2669 */ 2670 if (bveccount > NFS_COMMITBVECSIZ) { 2671 /* 2672 * Release the vnode interlock to avoid a lock 2673 * order reversal. 2674 */ 2675 VI_UNLOCK(vp); 2676 bvec = (struct buf **) 2677 malloc(bveccount * sizeof(struct buf *), 2678 M_TEMP, M_NOWAIT); 2679 VI_LOCK(vp); 2680 if (bvec == NULL) { 2681 bvec = bvec_on_stack; 2682 bvecsize = NFS_COMMITBVECSIZ; 2683 } else 2684 bvecsize = bveccount; 2685 } else { 2686 bvec = bvec_on_stack; 2687 bvecsize = NFS_COMMITBVECSIZ; 2688 } 2689 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 2690 if (bvecpos >= bvecsize) 2691 break; 2692 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2693 nbp = TAILQ_NEXT(bp, b_bobufs); 2694 continue; 2695 } 2696 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2697 (B_DELWRI | B_NEEDCOMMIT)) { 2698 BUF_UNLOCK(bp); 2699 nbp = TAILQ_NEXT(bp, b_bobufs); 2700 continue; 2701 } 2702 VI_UNLOCK(vp); 2703 bremfree(bp); 2704 /* 2705 * Work out if all buffers are using the same cred 2706 * so we can deal with them all with one commit. 2707 * 2708 * NOTE: we are not clearing B_DONE here, so we have 2709 * to do it later on in this routine if we intend to 2710 * initiate I/O on the bp. 2711 * 2712 * Note: to avoid loopback deadlocks, we do not 2713 * assign b_runningbufspace. 2714 */ 2715 if (wcred == NULL) 2716 wcred = bp->b_wcred; 2717 else if (wcred != bp->b_wcred) 2718 wcred = NOCRED; 2719 vfs_busy_pages(bp, 1); 2720 2721 VI_LOCK(vp); 2722 /* 2723 * bp is protected by being locked, but nbp is not 2724 * and vfs_busy_pages() may sleep. We have to 2725 * recalculate nbp. 2726 */ 2727 nbp = TAILQ_NEXT(bp, b_bobufs); 2728 2729 /* 2730 * A list of these buffers is kept so that the 2731 * second loop knows which buffers have actually 2732 * been committed. This is necessary, since there 2733 * may be a race between the commit rpc and new 2734 * uncommitted writes on the file. 2735 */ 2736 bvec[bvecpos++] = bp; 2737 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2738 bp->b_dirtyoff; 2739 if (toff < off) 2740 off = toff; 2741 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 2742 if (toff > endoff) 2743 endoff = toff; 2744 } 2745 splx(s); 2746 VI_UNLOCK(vp); 2747 } 2748 if (bvecpos > 0) { 2749 /* 2750 * Commit data on the server, as required. 2751 * If all bufs are using the same wcred, then use that with 2752 * one call for all of them, otherwise commit each one 2753 * separately. 2754 */ 2755 if (wcred != NOCRED) 2756 retv = nfs_commit(vp, off, (int)(endoff - off), 2757 wcred, td); 2758 else { 2759 retv = 0; 2760 for (i = 0; i < bvecpos; i++) { 2761 off_t off, size; 2762 bp = bvec[i]; 2763 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2764 bp->b_dirtyoff; 2765 size = (u_quad_t)(bp->b_dirtyend 2766 - bp->b_dirtyoff); 2767 retv = nfs_commit(vp, off, (int)size, 2768 bp->b_wcred, td); 2769 if (retv) break; 2770 } 2771 } 2772 2773 if (retv == NFSERR_STALEWRITEVERF) 2774 nfs_clearcommit(vp->v_mount); 2775 2776 /* 2777 * Now, either mark the blocks I/O done or mark the 2778 * blocks dirty, depending on whether the commit 2779 * succeeded. 2780 */ 2781 for (i = 0; i < bvecpos; i++) { 2782 bp = bvec[i]; 2783 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 2784 if (retv) { 2785 /* 2786 * Error, leave B_DELWRI intact 2787 */ 2788 vfs_unbusy_pages(bp); 2789 brelse(bp); 2790 } else { 2791 /* 2792 * Success, remove B_DELWRI ( bundirty() ). 2793 * 2794 * b_dirtyoff/b_dirtyend seem to be NFS 2795 * specific. We should probably move that 2796 * into bundirty(). XXX 2797 */ 2798 s = splbio(); 2799 bufobj_wref(&vp->v_bufobj); 2800 bp->b_flags |= B_ASYNC; 2801 bundirty(bp); 2802 bp->b_flags &= ~B_DONE; 2803 bp->b_ioflags &= ~BIO_ERROR; 2804 bp->b_dirtyoff = bp->b_dirtyend = 0; 2805 splx(s); 2806 bufdone(bp); 2807 } 2808 } 2809 } 2810 2811 /* 2812 * Start/do any write(s) that are required. 2813 */ 2814 loop: 2815 s = splbio(); 2816 VI_LOCK(vp); 2817 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 2818 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 2819 if (waitfor != MNT_WAIT || passone) 2820 continue; 2821 2822 error = BUF_TIMELOCK(bp, 2823 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 2824 VI_MTX(vp), "nfsfsync", slpflag, slptimeo); 2825 splx(s); 2826 if (error == 0) 2827 panic("nfs_fsync: inconsistent lock"); 2828 if (error == ENOLCK) 2829 goto loop; 2830 if (nfs_sigintr(nmp, NULL, td)) { 2831 error = EINTR; 2832 goto done; 2833 } 2834 if (slpflag == PCATCH) { 2835 slpflag = 0; 2836 slptimeo = 2 * hz; 2837 } 2838 goto loop; 2839 } 2840 if ((bp->b_flags & B_DELWRI) == 0) 2841 panic("nfs_fsync: not dirty"); 2842 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 2843 BUF_UNLOCK(bp); 2844 continue; 2845 } 2846 VI_UNLOCK(vp); 2847 bremfree(bp); 2848 if (passone || !commit) 2849 bp->b_flags |= B_ASYNC; 2850 else 2851 bp->b_flags |= B_ASYNC; 2852 splx(s); 2853 bwrite(bp); 2854 if (nfs_sigintr(nmp, NULL, td)) { 2855 error = EINTR; 2856 goto done; 2857 } 2858 goto loop; 2859 } 2860 splx(s); 2861 if (passone) { 2862 passone = 0; 2863 VI_UNLOCK(vp); 2864 goto again; 2865 } 2866 if (waitfor == MNT_WAIT) { 2867 while (vp->v_bufobj.bo_numoutput) { 2868 error = bufobj_wwait(&vp->v_bufobj, slpflag, slptimeo); 2869 if (error) { 2870 VI_UNLOCK(vp); 2871 error = nfs_sigintr(nmp, NULL, td); 2872 if (error) 2873 goto done; 2874 if (slpflag == PCATCH) { 2875 slpflag = 0; 2876 slptimeo = 2 * hz; 2877 } 2878 VI_LOCK(vp); 2879 } 2880 } 2881 if (vp->v_bufobj.bo_dirty.bv_cnt != 0 && commit) { 2882 VI_UNLOCK(vp); 2883 goto loop; 2884 } 2885 VI_UNLOCK(vp); 2886 /* 2887 * Wait for all the async IO requests to drain 2888 */ 2889 while (np->n_directio_asyncwr > 0) { 2890 np->n_flag |= NFSYNCWAIT; 2891 error = nfs_tsleep(td, (caddr_t)&np->n_directio_asyncwr, 2892 slpflag | (PRIBIO + 1), "nfsfsync", 0); 2893 if (error) { 2894 if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { 2895 error = EINTR; 2896 goto done; 2897 } 2898 } 2899 } 2900 2901 } else 2902 VI_UNLOCK(vp); 2903 if (np->n_flag & NWRITEERR) { 2904 error = np->n_error; 2905 np->n_flag &= ~NWRITEERR; 2906 } 2907 if (commit && vp->v_bufobj.bo_dirty.bv_cnt == 0 && 2908 vp->v_bufobj.bo_numoutput == 0 && np->n_directio_asyncwr == 0) 2909 np->n_flag &= ~NMODIFIED; 2910 done: 2911 if (bvec != NULL && bvec != bvec_on_stack) 2912 free(bvec, M_TEMP); 2913 return (error); 2914 } 2915 2916 /* 2917 * NFS advisory byte-level locks. 2918 */ 2919 static int 2920 nfs_advlock(struct vop_advlock_args *ap) 2921 { 2922 2923 if ((VFSTONFS(ap->a_vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { 2924 struct nfsnode *np = VTONFS(ap->a_vp); 2925 2926 return (lf_advlock(ap, &(np->n_lockf), np->n_size)); 2927 } 2928 return (nfs_dolock(ap)); 2929 } 2930 2931 /* 2932 * Print out the contents of an nfsnode. 2933 */ 2934 static int 2935 nfs_print(struct vop_print_args *ap) 2936 { 2937 struct vnode *vp = ap->a_vp; 2938 struct nfsnode *np = VTONFS(vp); 2939 2940 printf("\tfileid %ld fsid 0x%x", 2941 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 2942 if (vp->v_type == VFIFO) 2943 fifo_printinfo(vp); 2944 printf("\n"); 2945 return (0); 2946 } 2947 2948 /* 2949 * This is the "real" nfs::bwrite(struct buf*). 2950 * We set B_CACHE if this is a VMIO buffer. 2951 */ 2952 int 2953 nfs_writebp(struct buf *bp, int force __unused, struct thread *td) 2954 { 2955 int s; 2956 int oldflags = bp->b_flags; 2957 #if 0 2958 int retv = 1; 2959 off_t off; 2960 #endif 2961 2962 if (BUF_REFCNT(bp) == 0) 2963 panic("bwrite: buffer is not locked???"); 2964 2965 if (bp->b_flags & B_INVAL) { 2966 brelse(bp); 2967 return(0); 2968 } 2969 2970 bp->b_flags |= B_CACHE; 2971 2972 /* 2973 * Undirty the bp. We will redirty it later if the I/O fails. 2974 */ 2975 2976 s = splbio(); 2977 bundirty(bp); 2978 bp->b_flags &= ~B_DONE; 2979 bp->b_ioflags &= ~BIO_ERROR; 2980 bp->b_iocmd = BIO_WRITE; 2981 2982 bufobj_wref(bp->b_bufobj); 2983 curthread->td_proc->p_stats->p_ru.ru_oublock++; 2984 splx(s); 2985 2986 /* 2987 * Note: to avoid loopback deadlocks, we do not 2988 * assign b_runningbufspace. 2989 */ 2990 vfs_busy_pages(bp, 1); 2991 2992 BUF_KERNPROC(bp); 2993 bp->b_iooffset = dbtob(bp->b_blkno); 2994 bstrategy(bp); 2995 2996 if( (oldflags & B_ASYNC) == 0) { 2997 int rtval = bufwait(bp); 2998 2999 if (oldflags & B_DELWRI) { 3000 s = splbio(); 3001 reassignbuf(bp); 3002 splx(s); 3003 } 3004 3005 brelse(bp); 3006 return (rtval); 3007 } 3008 3009 return (0); 3010 } 3011 3012 /* 3013 * nfs special file access vnode op. 3014 * Essentially just get vattr and then imitate iaccess() since the device is 3015 * local to the client. 3016 */ 3017 static int 3018 nfsspec_access(struct vop_access_args *ap) 3019 { 3020 struct vattr *vap; 3021 struct ucred *cred = ap->a_cred; 3022 struct vnode *vp = ap->a_vp; 3023 mode_t mode = ap->a_mode; 3024 struct vattr vattr; 3025 int error; 3026 3027 /* 3028 * Disallow write attempts on filesystems mounted read-only; 3029 * unless the file is a socket, fifo, or a block or character 3030 * device resident on the filesystem. 3031 */ 3032 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3033 switch (vp->v_type) { 3034 case VREG: 3035 case VDIR: 3036 case VLNK: 3037 return (EROFS); 3038 default: 3039 break; 3040 } 3041 } 3042 vap = &vattr; 3043 error = VOP_GETATTR(vp, vap, cred, ap->a_td); 3044 if (error) 3045 return (error); 3046 return (vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, 3047 mode, cred, NULL)); 3048 } 3049 3050 /* 3051 * Read wrapper for fifos. 3052 */ 3053 static int 3054 nfsfifo_read(struct vop_read_args *ap) 3055 { 3056 struct nfsnode *np = VTONFS(ap->a_vp); 3057 3058 /* 3059 * Set access flag. 3060 */ 3061 np->n_flag |= NACC; 3062 getnanotime(&np->n_atim); 3063 return (fifo_specops.vop_read(ap)); 3064 } 3065 3066 /* 3067 * Write wrapper for fifos. 3068 */ 3069 static int 3070 nfsfifo_write(struct vop_write_args *ap) 3071 { 3072 struct nfsnode *np = VTONFS(ap->a_vp); 3073 3074 /* 3075 * Set update flag. 3076 */ 3077 np->n_flag |= NUPD; 3078 getnanotime(&np->n_mtim); 3079 return (fifo_specops.vop_write(ap)); 3080 } 3081 3082 /* 3083 * Close wrapper for fifos. 3084 * 3085 * Update the times on the nfsnode then do fifo close. 3086 */ 3087 static int 3088 nfsfifo_close(struct vop_close_args *ap) 3089 { 3090 struct vnode *vp = ap->a_vp; 3091 struct nfsnode *np = VTONFS(vp); 3092 struct vattr vattr; 3093 struct timespec ts; 3094 3095 if (np->n_flag & (NACC | NUPD)) { 3096 getnanotime(&ts); 3097 if (np->n_flag & NACC) 3098 np->n_atim = ts; 3099 if (np->n_flag & NUPD) 3100 np->n_mtim = ts; 3101 np->n_flag |= NCHG; 3102 if (vrefcnt(vp) == 1 && 3103 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3104 VATTR_NULL(&vattr); 3105 if (np->n_flag & NACC) 3106 vattr.va_atime = np->n_atim; 3107 if (np->n_flag & NUPD) 3108 vattr.va_mtime = np->n_mtim; 3109 (void)VOP_SETATTR(vp, &vattr, ap->a_cred, ap->a_td); 3110 } 3111 } 3112 return (fifo_specops.vop_close(ap)); 3113 } 3114 3115 /* 3116 * Just call nfs_writebp() with the force argument set to 1. 3117 * 3118 * NOTE: B_DONE may or may not be set in a_bp on call. 3119 */ 3120 static int 3121 nfs_bwrite(struct buf *bp) 3122 { 3123 3124 return (nfs_writebp(bp, 1, curthread)); 3125 } 3126 3127 struct buf_ops buf_ops_nfs = { 3128 .bop_name = "buf_ops_nfs", 3129 .bop_write = nfs_bwrite, 3130 .bop_strategy = bufstrategy, 3131 .bop_sync = bufsync, 3132 .bop_bdflush = bufbdflush, 3133 };
Cache object: 96e8411ed689381cc2b23a9348678c03
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